Move XPC and XPNET from arch/ia64/sn/kernel to drivers/misc/sgi-xp.
Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
depends on !IA64_HP_SIM
default y
-config IA64_SGI_SN_XP
- tristate "Support communication between SGI SSIs"
- depends on IA64_GENERIC || IA64_SGI_SN2
- select IA64_UNCACHED_ALLOCATOR
- help
- An SGI machine can be divided into multiple Single System
- Images which act independently of each other and have
- hardware based memory protection from the others. Enabling
- this feature will allow for direct communication between SSIs
- based on a network adapter and DMA messaging.
-
config FORCE_MAX_ZONEORDER
int "MAX_ORDER (11 - 17)" if !HUGETLB_PAGE
range 11 17 if !HUGETLB_PAGE
# License. See the file "COPYING" in the main directory of this archive
# for more details.
#
-# Copyright (C) 1999,2001-2006 Silicon Graphics, Inc. All Rights Reserved.
+# Copyright (C) 1999,2001-2006,2008 Silicon Graphics, Inc. All Rights Reserved.
#
EXTRA_CFLAGS += -Iarch/ia64/sn/include
sn2/
obj-$(CONFIG_IA64_GENERIC) += machvec.o
obj-$(CONFIG_SGI_TIOCX) += tiocx.o
-obj-$(CONFIG_IA64_SGI_SN_XP) += xp.o
-xp-y := xp_main.o xp_nofault.o
-obj-$(CONFIG_IA64_SGI_SN_XP) += xpc.o
-xpc-y := xpc_main.o xpc_channel.o xpc_partition.o
-obj-$(CONFIG_IA64_SGI_SN_XP) += xpnet.o
obj-$(CONFIG_PCI_MSI) += msi_sn.o
+++ /dev/null
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (c) 2004-2005 Silicon Graphics, Inc. All Rights Reserved.
- */
-
-
-/*
- * Cross Partition (XP) base.
- *
- * XP provides a base from which its users can interact
- * with XPC, yet not be dependent on XPC.
- *
- */
-
-
-#include <linux/kernel.h>
-#include <linux/interrupt.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <asm/sn/intr.h>
-#include <asm/sn/sn_sal.h>
-#include <asm/sn/xp.h>
-
-
-/*
- * Target of nofault PIO read.
- */
-u64 xp_nofault_PIOR_target;
-
-
-/*
- * xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level
- * users of XPC.
- */
-struct xpc_registration xpc_registrations[XPC_NCHANNELS];
-
-
-/*
- * Initialize the XPC interface to indicate that XPC isn't loaded.
- */
-static enum xpc_retval xpc_notloaded(void) { return xpcNotLoaded; }
-
-struct xpc_interface xpc_interface = {
- (void (*)(int)) xpc_notloaded,
- (void (*)(int)) xpc_notloaded,
- (enum xpc_retval (*)(partid_t, int, u32, void **)) xpc_notloaded,
- (enum xpc_retval (*)(partid_t, int, void *)) xpc_notloaded,
- (enum xpc_retval (*)(partid_t, int, void *, xpc_notify_func, void *))
- xpc_notloaded,
- (void (*)(partid_t, int, void *)) xpc_notloaded,
- (enum xpc_retval (*)(partid_t, void *)) xpc_notloaded
-};
-
-
-/*
- * XPC calls this when it (the XPC module) has been loaded.
- */
-void
-xpc_set_interface(void (*connect)(int),
- void (*disconnect)(int),
- enum xpc_retval (*allocate)(partid_t, int, u32, void **),
- enum xpc_retval (*send)(partid_t, int, void *),
- enum xpc_retval (*send_notify)(partid_t, int, void *,
- xpc_notify_func, void *),
- void (*received)(partid_t, int, void *),
- enum xpc_retval (*partid_to_nasids)(partid_t, void *))
-{
- xpc_interface.connect = connect;
- xpc_interface.disconnect = disconnect;
- xpc_interface.allocate = allocate;
- xpc_interface.send = send;
- xpc_interface.send_notify = send_notify;
- xpc_interface.received = received;
- xpc_interface.partid_to_nasids = partid_to_nasids;
-}
-
-
-/*
- * XPC calls this when it (the XPC module) is being unloaded.
- */
-void
-xpc_clear_interface(void)
-{
- xpc_interface.connect = (void (*)(int)) xpc_notloaded;
- xpc_interface.disconnect = (void (*)(int)) xpc_notloaded;
- xpc_interface.allocate = (enum xpc_retval (*)(partid_t, int, u32,
- void **)) xpc_notloaded;
- xpc_interface.send = (enum xpc_retval (*)(partid_t, int, void *))
- xpc_notloaded;
- xpc_interface.send_notify = (enum xpc_retval (*)(partid_t, int, void *,
- xpc_notify_func, void *)) xpc_notloaded;
- xpc_interface.received = (void (*)(partid_t, int, void *))
- xpc_notloaded;
- xpc_interface.partid_to_nasids = (enum xpc_retval (*)(partid_t, void *))
- xpc_notloaded;
-}
-
-
-/*
- * Register for automatic establishment of a channel connection whenever
- * a partition comes up.
- *
- * Arguments:
- *
- * ch_number - channel # to register for connection.
- * func - function to call for asynchronous notification of channel
- * state changes (i.e., connection, disconnection, error) and
- * the arrival of incoming messages.
- * key - pointer to optional user-defined value that gets passed back
- * to the user on any callouts made to func.
- * payload_size - size in bytes of the XPC message's payload area which
- * contains a user-defined message. The user should make
- * this large enough to hold their largest message.
- * nentries - max #of XPC message entries a message queue can contain.
- * The actual number, which is determined when a connection
- * is established and may be less then requested, will be
- * passed to the user via the xpcConnected callout.
- * assigned_limit - max number of kthreads allowed to be processing
- * messages (per connection) at any given instant.
- * idle_limit - max number of kthreads allowed to be idle at any given
- * instant.
- */
-enum xpc_retval
-xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size,
- u16 nentries, u32 assigned_limit, u32 idle_limit)
-{
- struct xpc_registration *registration;
-
-
- DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
- DBUG_ON(payload_size == 0 || nentries == 0);
- DBUG_ON(func == NULL);
- DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit);
-
- registration = &xpc_registrations[ch_number];
-
- if (mutex_lock_interruptible(®istration->mutex) != 0) {
- return xpcInterrupted;
- }
-
- /* if XPC_CHANNEL_REGISTERED(ch_number) */
- if (registration->func != NULL) {
- mutex_unlock(®istration->mutex);
- return xpcAlreadyRegistered;
- }
-
- /* register the channel for connection */
- registration->msg_size = XPC_MSG_SIZE(payload_size);
- registration->nentries = nentries;
- registration->assigned_limit = assigned_limit;
- registration->idle_limit = idle_limit;
- registration->key = key;
- registration->func = func;
-
- mutex_unlock(®istration->mutex);
-
- xpc_interface.connect(ch_number);
-
- return xpcSuccess;
-}
-
-
-/*
- * Remove the registration for automatic connection of the specified channel
- * when a partition comes up.
- *
- * Before returning this xpc_disconnect() will wait for all connections on the
- * specified channel have been closed/torndown. So the caller can be assured
- * that they will not be receiving any more callouts from XPC to their
- * function registered via xpc_connect().
- *
- * Arguments:
- *
- * ch_number - channel # to unregister.
- */
-void
-xpc_disconnect(int ch_number)
-{
- struct xpc_registration *registration;
-
-
- DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
-
- registration = &xpc_registrations[ch_number];
-
- /*
- * We've decided not to make this a down_interruptible(), since we
- * figured XPC's users will just turn around and call xpc_disconnect()
- * again anyways, so we might as well wait, if need be.
- */
- mutex_lock(®istration->mutex);
-
- /* if !XPC_CHANNEL_REGISTERED(ch_number) */
- if (registration->func == NULL) {
- mutex_unlock(®istration->mutex);
- return;
- }
-
- /* remove the connection registration for the specified channel */
- registration->func = NULL;
- registration->key = NULL;
- registration->nentries = 0;
- registration->msg_size = 0;
- registration->assigned_limit = 0;
- registration->idle_limit = 0;
-
- xpc_interface.disconnect(ch_number);
-
- mutex_unlock(®istration->mutex);
-
- return;
-}
-
-
-int __init
-xp_init(void)
-{
- int ret, ch_number;
- u64 func_addr = *(u64 *) xp_nofault_PIOR;
- u64 err_func_addr = *(u64 *) xp_error_PIOR;
-
-
- if (!ia64_platform_is("sn2")) {
- return -ENODEV;
- }
-
- /*
- * Register a nofault code region which performs a cross-partition
- * PIO read. If the PIO read times out, the MCA handler will consume
- * the error and return to a kernel-provided instruction to indicate
- * an error. This PIO read exists because it is guaranteed to timeout
- * if the destination is down (AMO operations do not timeout on at
- * least some CPUs on Shubs <= v1.2, which unfortunately we have to
- * work around).
- */
- if ((ret = sn_register_nofault_code(func_addr, err_func_addr,
- err_func_addr, 1, 1)) != 0) {
- printk(KERN_ERR "XP: can't register nofault code, error=%d\n",
- ret);
- }
- /*
- * Setup the nofault PIO read target. (There is no special reason why
- * SH_IPI_ACCESS was selected.)
- */
- if (is_shub2()) {
- xp_nofault_PIOR_target = SH2_IPI_ACCESS0;
- } else {
- xp_nofault_PIOR_target = SH1_IPI_ACCESS;
- }
-
- /* initialize the connection registration mutex */
- for (ch_number = 0; ch_number < XPC_NCHANNELS; ch_number++) {
- mutex_init(&xpc_registrations[ch_number].mutex);
- }
-
- return 0;
-}
-module_init(xp_init);
-
-
-void __exit
-xp_exit(void)
-{
- u64 func_addr = *(u64 *) xp_nofault_PIOR;
- u64 err_func_addr = *(u64 *) xp_error_PIOR;
-
-
- /* unregister the PIO read nofault code region */
- (void) sn_register_nofault_code(func_addr, err_func_addr,
- err_func_addr, 1, 0);
-}
-module_exit(xp_exit);
-
-
-MODULE_AUTHOR("Silicon Graphics, Inc.");
-MODULE_DESCRIPTION("Cross Partition (XP) base");
-MODULE_LICENSE("GPL");
-
-EXPORT_SYMBOL(xp_nofault_PIOR);
-EXPORT_SYMBOL(xp_nofault_PIOR_target);
-EXPORT_SYMBOL(xpc_registrations);
-EXPORT_SYMBOL(xpc_interface);
-EXPORT_SYMBOL(xpc_clear_interface);
-EXPORT_SYMBOL(xpc_set_interface);
-EXPORT_SYMBOL(xpc_connect);
-EXPORT_SYMBOL(xpc_disconnect);
-
+++ /dev/null
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (c) 2004-2007 Silicon Graphics, Inc. All Rights Reserved.
- */
-
-
-/*
- * The xp_nofault_PIOR function takes a pointer to a remote PIO register
- * and attempts to load and consume a value from it. This function
- * will be registered as a nofault code block. In the event that the
- * PIO read fails, the MCA handler will force the error to look
- * corrected and vector to the xp_error_PIOR which will return an error.
- *
- * The definition of "consumption" and the time it takes for an MCA
- * to surface is processor implementation specific. This code
- * is sufficient on Itanium through the Montvale processor family.
- * It may need to be adjusted for future processor implementations.
- *
- * extern int xp_nofault_PIOR(void *remote_register);
- */
-
- .global xp_nofault_PIOR
-xp_nofault_PIOR:
- mov r8=r0 // Stage a success return value
- ld8.acq r9=[r32];; // PIO Read the specified register
- adds r9=1,r9;; // Add to force consumption
- srlz.i;; // Allow time for MCA to surface
- br.ret.sptk.many b0;; // Return success
-
- .global xp_error_PIOR
-xp_error_PIOR:
- mov r8=1 // Return value of 1
- br.ret.sptk.many b0;; // Return failure
+++ /dev/null
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (c) 2004-2006 Silicon Graphics, Inc. All Rights Reserved.
- */
-
-
-/*
- * Cross Partition Communication (XPC) channel support.
- *
- * This is the part of XPC that manages the channels and
- * sends/receives messages across them to/from other partitions.
- *
- */
-
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/cache.h>
-#include <linux/interrupt.h>
-#include <linux/mutex.h>
-#include <linux/completion.h>
-#include <asm/sn/bte.h>
-#include <asm/sn/sn_sal.h>
-#include <asm/sn/xpc.h>
-
-
-/*
- * Guarantee that the kzalloc'd memory is cacheline aligned.
- */
-static void *
-xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
-{
- /* see if kzalloc will give us cachline aligned memory by default */
- *base = kzalloc(size, flags);
- if (*base == NULL) {
- return NULL;
- }
- if ((u64) *base == L1_CACHE_ALIGN((u64) *base)) {
- return *base;
- }
- kfree(*base);
-
- /* nope, we'll have to do it ourselves */
- *base = kzalloc(size + L1_CACHE_BYTES, flags);
- if (*base == NULL) {
- return NULL;
- }
- return (void *) L1_CACHE_ALIGN((u64) *base);
-}
-
-
-/*
- * Set up the initial values for the XPartition Communication channels.
- */
-static void
-xpc_initialize_channels(struct xpc_partition *part, partid_t partid)
-{
- int ch_number;
- struct xpc_channel *ch;
-
-
- for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
- ch = &part->channels[ch_number];
-
- ch->partid = partid;
- ch->number = ch_number;
- ch->flags = XPC_C_DISCONNECTED;
-
- ch->local_GP = &part->local_GPs[ch_number];
- ch->local_openclose_args =
- &part->local_openclose_args[ch_number];
-
- atomic_set(&ch->kthreads_assigned, 0);
- atomic_set(&ch->kthreads_idle, 0);
- atomic_set(&ch->kthreads_active, 0);
-
- atomic_set(&ch->references, 0);
- atomic_set(&ch->n_to_notify, 0);
-
- spin_lock_init(&ch->lock);
- mutex_init(&ch->msg_to_pull_mutex);
- init_completion(&ch->wdisconnect_wait);
-
- atomic_set(&ch->n_on_msg_allocate_wq, 0);
- init_waitqueue_head(&ch->msg_allocate_wq);
- init_waitqueue_head(&ch->idle_wq);
- }
-}
-
-
-/*
- * Setup the infrastructure necessary to support XPartition Communication
- * between the specified remote partition and the local one.
- */
-enum xpc_retval
-xpc_setup_infrastructure(struct xpc_partition *part)
-{
- int ret, cpuid;
- struct timer_list *timer;
- partid_t partid = XPC_PARTID(part);
-
-
- /*
- * Zero out MOST of the entry for this partition. Only the fields
- * starting with `nchannels' will be zeroed. The preceding fields must
- * remain `viable' across partition ups and downs, since they may be
- * referenced during this memset() operation.
- */
- memset(&part->nchannels, 0, sizeof(struct xpc_partition) -
- offsetof(struct xpc_partition, nchannels));
-
- /*
- * Allocate all of the channel structures as a contiguous chunk of
- * memory.
- */
- part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_NCHANNELS,
- GFP_KERNEL);
- if (part->channels == NULL) {
- dev_err(xpc_chan, "can't get memory for channels\n");
- return xpcNoMemory;
- }
-
- part->nchannels = XPC_NCHANNELS;
-
-
- /* allocate all the required GET/PUT values */
-
- part->local_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE,
- GFP_KERNEL, &part->local_GPs_base);
- if (part->local_GPs == NULL) {
- kfree(part->channels);
- part->channels = NULL;
- dev_err(xpc_chan, "can't get memory for local get/put "
- "values\n");
- return xpcNoMemory;
- }
-
- part->remote_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE,
- GFP_KERNEL, &part->remote_GPs_base);
- if (part->remote_GPs == NULL) {
- dev_err(xpc_chan, "can't get memory for remote get/put "
- "values\n");
- kfree(part->local_GPs_base);
- part->local_GPs = NULL;
- kfree(part->channels);
- part->channels = NULL;
- return xpcNoMemory;
- }
-
-
- /* allocate all the required open and close args */
-
- part->local_openclose_args = xpc_kzalloc_cacheline_aligned(
- XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
- &part->local_openclose_args_base);
- if (part->local_openclose_args == NULL) {
- dev_err(xpc_chan, "can't get memory for local connect args\n");
- kfree(part->remote_GPs_base);
- part->remote_GPs = NULL;
- kfree(part->local_GPs_base);
- part->local_GPs = NULL;
- kfree(part->channels);
- part->channels = NULL;
- return xpcNoMemory;
- }
-
- part->remote_openclose_args = xpc_kzalloc_cacheline_aligned(
- XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
- &part->remote_openclose_args_base);
- if (part->remote_openclose_args == NULL) {
- dev_err(xpc_chan, "can't get memory for remote connect args\n");
- kfree(part->local_openclose_args_base);
- part->local_openclose_args = NULL;
- kfree(part->remote_GPs_base);
- part->remote_GPs = NULL;
- kfree(part->local_GPs_base);
- part->local_GPs = NULL;
- kfree(part->channels);
- part->channels = NULL;
- return xpcNoMemory;
- }
-
-
- xpc_initialize_channels(part, partid);
-
- atomic_set(&part->nchannels_active, 0);
- atomic_set(&part->nchannels_engaged, 0);
-
-
- /* local_IPI_amo were set to 0 by an earlier memset() */
-
- /* Initialize this partitions AMO_t structure */
- part->local_IPI_amo_va = xpc_IPI_init(partid);
-
- spin_lock_init(&part->IPI_lock);
-
- atomic_set(&part->channel_mgr_requests, 1);
- init_waitqueue_head(&part->channel_mgr_wq);
-
- sprintf(part->IPI_owner, "xpc%02d", partid);
- ret = request_irq(SGI_XPC_NOTIFY, xpc_notify_IRQ_handler, IRQF_SHARED,
- part->IPI_owner, (void *) (u64) partid);
- if (ret != 0) {
- dev_err(xpc_chan, "can't register NOTIFY IRQ handler, "
- "errno=%d\n", -ret);
- kfree(part->remote_openclose_args_base);
- part->remote_openclose_args = NULL;
- kfree(part->local_openclose_args_base);
- part->local_openclose_args = NULL;
- kfree(part->remote_GPs_base);
- part->remote_GPs = NULL;
- kfree(part->local_GPs_base);
- part->local_GPs = NULL;
- kfree(part->channels);
- part->channels = NULL;
- return xpcLackOfResources;
- }
-
- /* Setup a timer to check for dropped IPIs */
- timer = &part->dropped_IPI_timer;
- init_timer(timer);
- timer->function = (void (*)(unsigned long)) xpc_dropped_IPI_check;
- timer->data = (unsigned long) part;
- timer->expires = jiffies + XPC_P_DROPPED_IPI_WAIT;
- add_timer(timer);
-
- /*
- * With the setting of the partition setup_state to XPC_P_SETUP, we're
- * declaring that this partition is ready to go.
- */
- part->setup_state = XPC_P_SETUP;
-
-
- /*
- * Setup the per partition specific variables required by the
- * remote partition to establish channel connections with us.
- *
- * The setting of the magic # indicates that these per partition
- * specific variables are ready to be used.
- */
- xpc_vars_part[partid].GPs_pa = __pa(part->local_GPs);
- xpc_vars_part[partid].openclose_args_pa =
- __pa(part->local_openclose_args);
- xpc_vars_part[partid].IPI_amo_pa = __pa(part->local_IPI_amo_va);
- cpuid = raw_smp_processor_id(); /* any CPU in this partition will do */
- xpc_vars_part[partid].IPI_nasid = cpuid_to_nasid(cpuid);
- xpc_vars_part[partid].IPI_phys_cpuid = cpu_physical_id(cpuid);
- xpc_vars_part[partid].nchannels = part->nchannels;
- xpc_vars_part[partid].magic = XPC_VP_MAGIC1;
-
- return xpcSuccess;
-}
-
-
-/*
- * Create a wrapper that hides the underlying mechanism for pulling a cacheline
- * (or multiple cachelines) from a remote partition.
- *
- * src must be a cacheline aligned physical address on the remote partition.
- * dst must be a cacheline aligned virtual address on this partition.
- * cnt must be an cacheline sized
- */
-static enum xpc_retval
-xpc_pull_remote_cachelines(struct xpc_partition *part, void *dst,
- const void *src, size_t cnt)
-{
- bte_result_t bte_ret;
-
-
- DBUG_ON((u64) src != L1_CACHE_ALIGN((u64) src));
- DBUG_ON((u64) dst != L1_CACHE_ALIGN((u64) dst));
- DBUG_ON(cnt != L1_CACHE_ALIGN(cnt));
-
- if (part->act_state == XPC_P_DEACTIVATING) {
- return part->reason;
- }
-
- bte_ret = xp_bte_copy((u64) src, (u64) dst, (u64) cnt,
- (BTE_NORMAL | BTE_WACQUIRE), NULL);
- if (bte_ret == BTE_SUCCESS) {
- return xpcSuccess;
- }
-
- dev_dbg(xpc_chan, "xp_bte_copy() from partition %d failed, ret=%d\n",
- XPC_PARTID(part), bte_ret);
-
- return xpc_map_bte_errors(bte_ret);
-}
-
-
-/*
- * Pull the remote per partition specific variables from the specified
- * partition.
- */
-enum xpc_retval
-xpc_pull_remote_vars_part(struct xpc_partition *part)
-{
- u8 buffer[L1_CACHE_BYTES * 2];
- struct xpc_vars_part *pulled_entry_cacheline =
- (struct xpc_vars_part *) L1_CACHE_ALIGN((u64) buffer);
- struct xpc_vars_part *pulled_entry;
- u64 remote_entry_cacheline_pa, remote_entry_pa;
- partid_t partid = XPC_PARTID(part);
- enum xpc_retval ret;
-
-
- /* pull the cacheline that contains the variables we're interested in */
-
- DBUG_ON(part->remote_vars_part_pa !=
- L1_CACHE_ALIGN(part->remote_vars_part_pa));
- DBUG_ON(sizeof(struct xpc_vars_part) != L1_CACHE_BYTES / 2);
-
- remote_entry_pa = part->remote_vars_part_pa +
- sn_partition_id * sizeof(struct xpc_vars_part);
-
- remote_entry_cacheline_pa = (remote_entry_pa & ~(L1_CACHE_BYTES - 1));
-
- pulled_entry = (struct xpc_vars_part *) ((u64) pulled_entry_cacheline +
- (remote_entry_pa & (L1_CACHE_BYTES - 1)));
-
- ret = xpc_pull_remote_cachelines(part, pulled_entry_cacheline,
- (void *) remote_entry_cacheline_pa,
- L1_CACHE_BYTES);
- if (ret != xpcSuccess) {
- dev_dbg(xpc_chan, "failed to pull XPC vars_part from "
- "partition %d, ret=%d\n", partid, ret);
- return ret;
- }
-
-
- /* see if they've been set up yet */
-
- if (pulled_entry->magic != XPC_VP_MAGIC1 &&
- pulled_entry->magic != XPC_VP_MAGIC2) {
-
- if (pulled_entry->magic != 0) {
- dev_dbg(xpc_chan, "partition %d's XPC vars_part for "
- "partition %d has bad magic value (=0x%lx)\n",
- partid, sn_partition_id, pulled_entry->magic);
- return xpcBadMagic;
- }
-
- /* they've not been initialized yet */
- return xpcRetry;
- }
-
- if (xpc_vars_part[partid].magic == XPC_VP_MAGIC1) {
-
- /* validate the variables */
-
- if (pulled_entry->GPs_pa == 0 ||
- pulled_entry->openclose_args_pa == 0 ||
- pulled_entry->IPI_amo_pa == 0) {
-
- dev_err(xpc_chan, "partition %d's XPC vars_part for "
- "partition %d are not valid\n", partid,
- sn_partition_id);
- return xpcInvalidAddress;
- }
-
- /* the variables we imported look to be valid */
-
- part->remote_GPs_pa = pulled_entry->GPs_pa;
- part->remote_openclose_args_pa =
- pulled_entry->openclose_args_pa;
- part->remote_IPI_amo_va =
- (AMO_t *) __va(pulled_entry->IPI_amo_pa);
- part->remote_IPI_nasid = pulled_entry->IPI_nasid;
- part->remote_IPI_phys_cpuid = pulled_entry->IPI_phys_cpuid;
-
- if (part->nchannels > pulled_entry->nchannels) {
- part->nchannels = pulled_entry->nchannels;
- }
-
- /* let the other side know that we've pulled their variables */
-
- xpc_vars_part[partid].magic = XPC_VP_MAGIC2;
- }
-
- if (pulled_entry->magic == XPC_VP_MAGIC1) {
- return xpcRetry;
- }
-
- return xpcSuccess;
-}
-
-
-/*
- * Get the IPI flags and pull the openclose args and/or remote GPs as needed.
- */
-static u64
-xpc_get_IPI_flags(struct xpc_partition *part)
-{
- unsigned long irq_flags;
- u64 IPI_amo;
- enum xpc_retval ret;
-
-
- /*
- * See if there are any IPI flags to be handled.
- */
-
- spin_lock_irqsave(&part->IPI_lock, irq_flags);
- if ((IPI_amo = part->local_IPI_amo) != 0) {
- part->local_IPI_amo = 0;
- }
- spin_unlock_irqrestore(&part->IPI_lock, irq_flags);
-
-
- if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_amo)) {
- ret = xpc_pull_remote_cachelines(part,
- part->remote_openclose_args,
- (void *) part->remote_openclose_args_pa,
- XPC_OPENCLOSE_ARGS_SIZE);
- if (ret != xpcSuccess) {
- XPC_DEACTIVATE_PARTITION(part, ret);
-
- dev_dbg(xpc_chan, "failed to pull openclose args from "
- "partition %d, ret=%d\n", XPC_PARTID(part),
- ret);
-
- /* don't bother processing IPIs anymore */
- IPI_amo = 0;
- }
- }
-
- if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_amo)) {
- ret = xpc_pull_remote_cachelines(part, part->remote_GPs,
- (void *) part->remote_GPs_pa,
- XPC_GP_SIZE);
- if (ret != xpcSuccess) {
- XPC_DEACTIVATE_PARTITION(part, ret);
-
- dev_dbg(xpc_chan, "failed to pull GPs from partition "
- "%d, ret=%d\n", XPC_PARTID(part), ret);
-
- /* don't bother processing IPIs anymore */
- IPI_amo = 0;
- }
- }
-
- return IPI_amo;
-}
-
-
-/*
- * Allocate the local message queue and the notify queue.
- */
-static enum xpc_retval
-xpc_allocate_local_msgqueue(struct xpc_channel *ch)
-{
- unsigned long irq_flags;
- int nentries;
- size_t nbytes;
-
-
- // >>> may want to check for ch->flags & XPC_C_DISCONNECTING between
- // >>> iterations of the for-loop, bail if set?
-
- // >>> should we impose a minimum #of entries? like 4 or 8?
- for (nentries = ch->local_nentries; nentries > 0; nentries--) {
-
- nbytes = nentries * ch->msg_size;
- ch->local_msgqueue = xpc_kzalloc_cacheline_aligned(nbytes,
- GFP_KERNEL,
- &ch->local_msgqueue_base);
- if (ch->local_msgqueue == NULL) {
- continue;
- }
-
- nbytes = nentries * sizeof(struct xpc_notify);
- ch->notify_queue = kzalloc(nbytes, GFP_KERNEL);
- if (ch->notify_queue == NULL) {
- kfree(ch->local_msgqueue_base);
- ch->local_msgqueue = NULL;
- continue;
- }
-
- spin_lock_irqsave(&ch->lock, irq_flags);
- if (nentries < ch->local_nentries) {
- dev_dbg(xpc_chan, "nentries=%d local_nentries=%d, "
- "partid=%d, channel=%d\n", nentries,
- ch->local_nentries, ch->partid, ch->number);
-
- ch->local_nentries = nentries;
- }
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return xpcSuccess;
- }
-
- dev_dbg(xpc_chan, "can't get memory for local message queue and notify "
- "queue, partid=%d, channel=%d\n", ch->partid, ch->number);
- return xpcNoMemory;
-}
-
-
-/*
- * Allocate the cached remote message queue.
- */
-static enum xpc_retval
-xpc_allocate_remote_msgqueue(struct xpc_channel *ch)
-{
- unsigned long irq_flags;
- int nentries;
- size_t nbytes;
-
-
- DBUG_ON(ch->remote_nentries <= 0);
-
- // >>> may want to check for ch->flags & XPC_C_DISCONNECTING between
- // >>> iterations of the for-loop, bail if set?
-
- // >>> should we impose a minimum #of entries? like 4 or 8?
- for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
-
- nbytes = nentries * ch->msg_size;
- ch->remote_msgqueue = xpc_kzalloc_cacheline_aligned(nbytes,
- GFP_KERNEL,
- &ch->remote_msgqueue_base);
- if (ch->remote_msgqueue == NULL) {
- continue;
- }
-
- spin_lock_irqsave(&ch->lock, irq_flags);
- if (nentries < ch->remote_nentries) {
- dev_dbg(xpc_chan, "nentries=%d remote_nentries=%d, "
- "partid=%d, channel=%d\n", nentries,
- ch->remote_nentries, ch->partid, ch->number);
-
- ch->remote_nentries = nentries;
- }
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return xpcSuccess;
- }
-
- dev_dbg(xpc_chan, "can't get memory for cached remote message queue, "
- "partid=%d, channel=%d\n", ch->partid, ch->number);
- return xpcNoMemory;
-}
-
-
-/*
- * Allocate message queues and other stuff associated with a channel.
- *
- * Note: Assumes all of the channel sizes are filled in.
- */
-static enum xpc_retval
-xpc_allocate_msgqueues(struct xpc_channel *ch)
-{
- unsigned long irq_flags;
- enum xpc_retval ret;
-
-
- DBUG_ON(ch->flags & XPC_C_SETUP);
-
- if ((ret = xpc_allocate_local_msgqueue(ch)) != xpcSuccess) {
- return ret;
- }
-
- if ((ret = xpc_allocate_remote_msgqueue(ch)) != xpcSuccess) {
- kfree(ch->local_msgqueue_base);
- ch->local_msgqueue = NULL;
- kfree(ch->notify_queue);
- ch->notify_queue = NULL;
- return ret;
- }
-
- spin_lock_irqsave(&ch->lock, irq_flags);
- ch->flags |= XPC_C_SETUP;
- spin_unlock_irqrestore(&ch->lock, irq_flags);
-
- return xpcSuccess;
-}
-
-
-/*
- * Process a connect message from a remote partition.
- *
- * Note: xpc_process_connect() is expecting to be called with the
- * spin_lock_irqsave held and will leave it locked upon return.
- */
-static void
-xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
-{
- enum xpc_retval ret;
-
-
- DBUG_ON(!spin_is_locked(&ch->lock));
-
- if (!(ch->flags & XPC_C_OPENREQUEST) ||
- !(ch->flags & XPC_C_ROPENREQUEST)) {
- /* nothing more to do for now */
- return;
- }
- DBUG_ON(!(ch->flags & XPC_C_CONNECTING));
-
- if (!(ch->flags & XPC_C_SETUP)) {
- spin_unlock_irqrestore(&ch->lock, *irq_flags);
- ret = xpc_allocate_msgqueues(ch);
- spin_lock_irqsave(&ch->lock, *irq_flags);
-
- if (ret != xpcSuccess) {
- XPC_DISCONNECT_CHANNEL(ch, ret, irq_flags);
- }
- if (ch->flags & (XPC_C_CONNECTED | XPC_C_DISCONNECTING)) {
- return;
- }
-
- DBUG_ON(!(ch->flags & XPC_C_SETUP));
- DBUG_ON(ch->local_msgqueue == NULL);
- DBUG_ON(ch->remote_msgqueue == NULL);
- }
-
- if (!(ch->flags & XPC_C_OPENREPLY)) {
- ch->flags |= XPC_C_OPENREPLY;
- xpc_IPI_send_openreply(ch, irq_flags);
- }
-
- if (!(ch->flags & XPC_C_ROPENREPLY)) {
- return;
- }
-
- DBUG_ON(ch->remote_msgqueue_pa == 0);
-
- ch->flags = (XPC_C_CONNECTED | XPC_C_SETUP); /* clear all else */
-
- dev_info(xpc_chan, "channel %d to partition %d connected\n",
- ch->number, ch->partid);
-
- spin_unlock_irqrestore(&ch->lock, *irq_flags);
- xpc_create_kthreads(ch, 1, 0);
- spin_lock_irqsave(&ch->lock, *irq_flags);
-}
-
-
-/*
- * Notify those who wanted to be notified upon delivery of their message.
- */
-static void
-xpc_notify_senders(struct xpc_channel *ch, enum xpc_retval reason, s64 put)
-{
- struct xpc_notify *notify;
- u8 notify_type;
- s64 get = ch->w_remote_GP.get - 1;
-
-
- while (++get < put && atomic_read(&ch->n_to_notify) > 0) {
-
- notify = &ch->notify_queue[get % ch->local_nentries];
-
- /*
- * See if the notify entry indicates it was associated with
- * a message who's sender wants to be notified. It is possible
- * that it is, but someone else is doing or has done the
- * notification.
- */
- notify_type = notify->type;
- if (notify_type == 0 ||
- cmpxchg(¬ify->type, notify_type, 0) !=
- notify_type) {
- continue;
- }
-
- DBUG_ON(notify_type != XPC_N_CALL);
-
- atomic_dec(&ch->n_to_notify);
-
- if (notify->func != NULL) {
- dev_dbg(xpc_chan, "notify->func() called, notify=0x%p, "
- "msg_number=%ld, partid=%d, channel=%d\n",
- (void *) notify, get, ch->partid, ch->number);
-
- notify->func(reason, ch->partid, ch->number,
- notify->key);
-
- dev_dbg(xpc_chan, "notify->func() returned, "
- "notify=0x%p, msg_number=%ld, partid=%d, "
- "channel=%d\n", (void *) notify, get,
- ch->partid, ch->number);
- }
- }
-}
-
-
-/*
- * Free up message queues and other stuff that were allocated for the specified
- * channel.
- *
- * Note: ch->reason and ch->reason_line are left set for debugging purposes,
- * they're cleared when XPC_C_DISCONNECTED is cleared.
- */
-static void
-xpc_free_msgqueues(struct xpc_channel *ch)
-{
- DBUG_ON(!spin_is_locked(&ch->lock));
- DBUG_ON(atomic_read(&ch->n_to_notify) != 0);
-
- ch->remote_msgqueue_pa = 0;
- ch->func = NULL;
- ch->key = NULL;
- ch->msg_size = 0;
- ch->local_nentries = 0;
- ch->remote_nentries = 0;
- ch->kthreads_assigned_limit = 0;
- ch->kthreads_idle_limit = 0;
-
- ch->local_GP->get = 0;
- ch->local_GP->put = 0;
- ch->remote_GP.get = 0;
- ch->remote_GP.put = 0;
- ch->w_local_GP.get = 0;
- ch->w_local_GP.put = 0;
- ch->w_remote_GP.get = 0;
- ch->w_remote_GP.put = 0;
- ch->next_msg_to_pull = 0;
-
- if (ch->flags & XPC_C_SETUP) {
- ch->flags &= ~XPC_C_SETUP;
-
- dev_dbg(xpc_chan, "ch->flags=0x%x, partid=%d, channel=%d\n",
- ch->flags, ch->partid, ch->number);
-
- kfree(ch->local_msgqueue_base);
- ch->local_msgqueue = NULL;
- kfree(ch->remote_msgqueue_base);
- ch->remote_msgqueue = NULL;
- kfree(ch->notify_queue);
- ch->notify_queue = NULL;
- }
-}
-
-
-/*
- * spin_lock_irqsave() is expected to be held on entry.
- */
-static void
-xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
-{
- struct xpc_partition *part = &xpc_partitions[ch->partid];
- u32 channel_was_connected = (ch->flags & XPC_C_WASCONNECTED);
-
-
- DBUG_ON(!spin_is_locked(&ch->lock));
-
- if (!(ch->flags & XPC_C_DISCONNECTING)) {
- return;
- }
-
- DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
-
- /* make sure all activity has settled down first */
-
- if (atomic_read(&ch->kthreads_assigned) > 0 ||
- atomic_read(&ch->references) > 0) {
- return;
- }
- DBUG_ON((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
- !(ch->flags & XPC_C_DISCONNECTINGCALLOUT_MADE));
-
- if (part->act_state == XPC_P_DEACTIVATING) {
- /* can't proceed until the other side disengages from us */
- if (xpc_partition_engaged(1UL << ch->partid)) {
- return;
- }
-
- } else {
-
- /* as long as the other side is up do the full protocol */
-
- if (!(ch->flags & XPC_C_RCLOSEREQUEST)) {
- return;
- }
-
- if (!(ch->flags & XPC_C_CLOSEREPLY)) {
- ch->flags |= XPC_C_CLOSEREPLY;
- xpc_IPI_send_closereply(ch, irq_flags);
- }
-
- if (!(ch->flags & XPC_C_RCLOSEREPLY)) {
- return;
- }
- }
-
- /* wake those waiting for notify completion */
- if (atomic_read(&ch->n_to_notify) > 0) {
- /* >>> we do callout while holding ch->lock */
- xpc_notify_senders(ch, ch->reason, ch->w_local_GP.put);
- }
-
- /* both sides are disconnected now */
-
- if (ch->flags & XPC_C_DISCONNECTINGCALLOUT_MADE) {
- spin_unlock_irqrestore(&ch->lock, *irq_flags);
- xpc_disconnect_callout(ch, xpcDisconnected);
- spin_lock_irqsave(&ch->lock, *irq_flags);
- }
-
- /* it's now safe to free the channel's message queues */
- xpc_free_msgqueues(ch);
-
- /* mark disconnected, clear all other flags except XPC_C_WDISCONNECT */
- ch->flags = (XPC_C_DISCONNECTED | (ch->flags & XPC_C_WDISCONNECT));
-
- atomic_dec(&part->nchannels_active);
-
- if (channel_was_connected) {
- dev_info(xpc_chan, "channel %d to partition %d disconnected, "
- "reason=%d\n", ch->number, ch->partid, ch->reason);
- }
-
- if (ch->flags & XPC_C_WDISCONNECT) {
- /* we won't lose the CPU since we're holding ch->lock */
- complete(&ch->wdisconnect_wait);
- } else if (ch->delayed_IPI_flags) {
- if (part->act_state != XPC_P_DEACTIVATING) {
- /* time to take action on any delayed IPI flags */
- spin_lock(&part->IPI_lock);
- XPC_SET_IPI_FLAGS(part->local_IPI_amo, ch->number,
- ch->delayed_IPI_flags);
- spin_unlock(&part->IPI_lock);
- }
- ch->delayed_IPI_flags = 0;
- }
-}
-
-
-/*
- * Process a change in the channel's remote connection state.
- */
-static void
-xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
- u8 IPI_flags)
-{
- unsigned long irq_flags;
- struct xpc_openclose_args *args =
- &part->remote_openclose_args[ch_number];
- struct xpc_channel *ch = &part->channels[ch_number];
- enum xpc_retval reason;
-
-
-
- spin_lock_irqsave(&ch->lock, irq_flags);
-
-again:
-
- if ((ch->flags & XPC_C_DISCONNECTED) &&
- (ch->flags & XPC_C_WDISCONNECT)) {
- /*
- * Delay processing IPI flags until thread waiting disconnect
- * has had a chance to see that the channel is disconnected.
- */
- ch->delayed_IPI_flags |= IPI_flags;
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
- }
-
-
- if (IPI_flags & XPC_IPI_CLOSEREQUEST) {
-
- dev_dbg(xpc_chan, "XPC_IPI_CLOSEREQUEST (reason=%d) received "
- "from partid=%d, channel=%d\n", args->reason,
- ch->partid, ch->number);
-
- /*
- * If RCLOSEREQUEST is set, we're probably waiting for
- * RCLOSEREPLY. We should find it and a ROPENREQUEST packed
- * with this RCLOSEREQUEST in the IPI_flags.
- */
-
- if (ch->flags & XPC_C_RCLOSEREQUEST) {
- DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
- DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
- DBUG_ON(!(ch->flags & XPC_C_CLOSEREPLY));
- DBUG_ON(ch->flags & XPC_C_RCLOSEREPLY);
-
- DBUG_ON(!(IPI_flags & XPC_IPI_CLOSEREPLY));
- IPI_flags &= ~XPC_IPI_CLOSEREPLY;
- ch->flags |= XPC_C_RCLOSEREPLY;
-
- /* both sides have finished disconnecting */
- xpc_process_disconnect(ch, &irq_flags);
- DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));
- goto again;
- }
-
- if (ch->flags & XPC_C_DISCONNECTED) {
- if (!(IPI_flags & XPC_IPI_OPENREQUEST)) {
- if ((XPC_GET_IPI_FLAGS(part->local_IPI_amo,
- ch_number) & XPC_IPI_OPENREQUEST)) {
-
- DBUG_ON(ch->delayed_IPI_flags != 0);
- spin_lock(&part->IPI_lock);
- XPC_SET_IPI_FLAGS(part->local_IPI_amo,
- ch_number,
- XPC_IPI_CLOSEREQUEST);
- spin_unlock(&part->IPI_lock);
- }
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
- }
-
- XPC_SET_REASON(ch, 0, 0);
- ch->flags &= ~XPC_C_DISCONNECTED;
-
- atomic_inc(&part->nchannels_active);
- ch->flags |= (XPC_C_CONNECTING | XPC_C_ROPENREQUEST);
- }
-
- IPI_flags &= ~(XPC_IPI_OPENREQUEST | XPC_IPI_OPENREPLY);
-
- /*
- * The meaningful CLOSEREQUEST connection state fields are:
- * reason = reason connection is to be closed
- */
-
- ch->flags |= XPC_C_RCLOSEREQUEST;
-
- if (!(ch->flags & XPC_C_DISCONNECTING)) {
- reason = args->reason;
- if (reason <= xpcSuccess || reason > xpcUnknownReason) {
- reason = xpcUnknownReason;
- } else if (reason == xpcUnregistering) {
- reason = xpcOtherUnregistering;
- }
-
- XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);
-
- DBUG_ON(IPI_flags & XPC_IPI_CLOSEREPLY);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
- }
-
- xpc_process_disconnect(ch, &irq_flags);
- }
-
-
- if (IPI_flags & XPC_IPI_CLOSEREPLY) {
-
- dev_dbg(xpc_chan, "XPC_IPI_CLOSEREPLY received from partid=%d,"
- " channel=%d\n", ch->partid, ch->number);
-
- if (ch->flags & XPC_C_DISCONNECTED) {
- DBUG_ON(part->act_state != XPC_P_DEACTIVATING);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
- }
-
- DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
-
- if (!(ch->flags & XPC_C_RCLOSEREQUEST)) {
- if ((XPC_GET_IPI_FLAGS(part->local_IPI_amo, ch_number)
- & XPC_IPI_CLOSEREQUEST)) {
-
- DBUG_ON(ch->delayed_IPI_flags != 0);
- spin_lock(&part->IPI_lock);
- XPC_SET_IPI_FLAGS(part->local_IPI_amo,
- ch_number, XPC_IPI_CLOSEREPLY);
- spin_unlock(&part->IPI_lock);
- }
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
- }
-
- ch->flags |= XPC_C_RCLOSEREPLY;
-
- if (ch->flags & XPC_C_CLOSEREPLY) {
- /* both sides have finished disconnecting */
- xpc_process_disconnect(ch, &irq_flags);
- }
- }
-
-
- if (IPI_flags & XPC_IPI_OPENREQUEST) {
-
- dev_dbg(xpc_chan, "XPC_IPI_OPENREQUEST (msg_size=%d, "
- "local_nentries=%d) received from partid=%d, "
- "channel=%d\n", args->msg_size, args->local_nentries,
- ch->partid, ch->number);
-
- if (part->act_state == XPC_P_DEACTIVATING ||
- (ch->flags & XPC_C_ROPENREQUEST)) {
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
- }
-
- if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_WDISCONNECT)) {
- ch->delayed_IPI_flags |= XPC_IPI_OPENREQUEST;
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
- }
- DBUG_ON(!(ch->flags & (XPC_C_DISCONNECTED |
- XPC_C_OPENREQUEST)));
- DBUG_ON(ch->flags & (XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY |
- XPC_C_OPENREPLY | XPC_C_CONNECTED));
-
- /*
- * The meaningful OPENREQUEST connection state fields are:
- * msg_size = size of channel's messages in bytes
- * local_nentries = remote partition's local_nentries
- */
- if (args->msg_size == 0 || args->local_nentries == 0) {
- /* assume OPENREQUEST was delayed by mistake */
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
- }
-
- ch->flags |= (XPC_C_ROPENREQUEST | XPC_C_CONNECTING);
- ch->remote_nentries = args->local_nentries;
-
-
- if (ch->flags & XPC_C_OPENREQUEST) {
- if (args->msg_size != ch->msg_size) {
- XPC_DISCONNECT_CHANNEL(ch, xpcUnequalMsgSizes,
- &irq_flags);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
- }
- } else {
- ch->msg_size = args->msg_size;
-
- XPC_SET_REASON(ch, 0, 0);
- ch->flags &= ~XPC_C_DISCONNECTED;
-
- atomic_inc(&part->nchannels_active);
- }
-
- xpc_process_connect(ch, &irq_flags);
- }
-
-
- if (IPI_flags & XPC_IPI_OPENREPLY) {
-
- dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY (local_msgqueue_pa=0x%lx, "
- "local_nentries=%d, remote_nentries=%d) received from "
- "partid=%d, channel=%d\n", args->local_msgqueue_pa,
- args->local_nentries, args->remote_nentries,
- ch->partid, ch->number);
-
- if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED)) {
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
- }
- if (!(ch->flags & XPC_C_OPENREQUEST)) {
- XPC_DISCONNECT_CHANNEL(ch, xpcOpenCloseError,
- &irq_flags);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
- }
-
- DBUG_ON(!(ch->flags & XPC_C_ROPENREQUEST));
- DBUG_ON(ch->flags & XPC_C_CONNECTED);
-
- /*
- * The meaningful OPENREPLY connection state fields are:
- * local_msgqueue_pa = physical address of remote
- * partition's local_msgqueue
- * local_nentries = remote partition's local_nentries
- * remote_nentries = remote partition's remote_nentries
- */
- DBUG_ON(args->local_msgqueue_pa == 0);
- DBUG_ON(args->local_nentries == 0);
- DBUG_ON(args->remote_nentries == 0);
-
- ch->flags |= XPC_C_ROPENREPLY;
- ch->remote_msgqueue_pa = args->local_msgqueue_pa;
-
- if (args->local_nentries < ch->remote_nentries) {
- dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new "
- "remote_nentries=%d, old remote_nentries=%d, "
- "partid=%d, channel=%d\n",
- args->local_nentries, ch->remote_nentries,
- ch->partid, ch->number);
-
- ch->remote_nentries = args->local_nentries;
- }
- if (args->remote_nentries < ch->local_nentries) {
- dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new "
- "local_nentries=%d, old local_nentries=%d, "
- "partid=%d, channel=%d\n",
- args->remote_nentries, ch->local_nentries,
- ch->partid, ch->number);
-
- ch->local_nentries = args->remote_nentries;
- }
-
- xpc_process_connect(ch, &irq_flags);
- }
-
- spin_unlock_irqrestore(&ch->lock, irq_flags);
-}
-
-
-/*
- * Attempt to establish a channel connection to a remote partition.
- */
-static enum xpc_retval
-xpc_connect_channel(struct xpc_channel *ch)
-{
- unsigned long irq_flags;
- struct xpc_registration *registration = &xpc_registrations[ch->number];
-
-
- if (mutex_trylock(®istration->mutex) == 0) {
- return xpcRetry;
- }
-
- if (!XPC_CHANNEL_REGISTERED(ch->number)) {
- mutex_unlock(®istration->mutex);
- return xpcUnregistered;
- }
-
- spin_lock_irqsave(&ch->lock, irq_flags);
-
- DBUG_ON(ch->flags & XPC_C_CONNECTED);
- DBUG_ON(ch->flags & XPC_C_OPENREQUEST);
-
- if (ch->flags & XPC_C_DISCONNECTING) {
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- mutex_unlock(®istration->mutex);
- return ch->reason;
- }
-
-
- /* add info from the channel connect registration to the channel */
-
- ch->kthreads_assigned_limit = registration->assigned_limit;
- ch->kthreads_idle_limit = registration->idle_limit;
- DBUG_ON(atomic_read(&ch->kthreads_assigned) != 0);
- DBUG_ON(atomic_read(&ch->kthreads_idle) != 0);
- DBUG_ON(atomic_read(&ch->kthreads_active) != 0);
-
- ch->func = registration->func;
- DBUG_ON(registration->func == NULL);
- ch->key = registration->key;
-
- ch->local_nentries = registration->nentries;
-
- if (ch->flags & XPC_C_ROPENREQUEST) {
- if (registration->msg_size != ch->msg_size) {
- /* the local and remote sides aren't the same */
-
- /*
- * Because XPC_DISCONNECT_CHANNEL() can block we're
- * forced to up the registration sema before we unlock
- * the channel lock. But that's okay here because we're
- * done with the part that required the registration
- * sema. XPC_DISCONNECT_CHANNEL() requires that the
- * channel lock be locked and will unlock and relock
- * the channel lock as needed.
- */
- mutex_unlock(®istration->mutex);
- XPC_DISCONNECT_CHANNEL(ch, xpcUnequalMsgSizes,
- &irq_flags);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return xpcUnequalMsgSizes;
- }
- } else {
- ch->msg_size = registration->msg_size;
-
- XPC_SET_REASON(ch, 0, 0);
- ch->flags &= ~XPC_C_DISCONNECTED;
-
- atomic_inc(&xpc_partitions[ch->partid].nchannels_active);
- }
-
- mutex_unlock(®istration->mutex);
-
-
- /* initiate the connection */
-
- ch->flags |= (XPC_C_OPENREQUEST | XPC_C_CONNECTING);
- xpc_IPI_send_openrequest(ch, &irq_flags);
-
- xpc_process_connect(ch, &irq_flags);
-
- spin_unlock_irqrestore(&ch->lock, irq_flags);
-
- return xpcSuccess;
-}
-
-
-/*
- * Clear some of the msg flags in the local message queue.
- */
-static inline void
-xpc_clear_local_msgqueue_flags(struct xpc_channel *ch)
-{
- struct xpc_msg *msg;
- s64 get;
-
-
- get = ch->w_remote_GP.get;
- do {
- msg = (struct xpc_msg *) ((u64) ch->local_msgqueue +
- (get % ch->local_nentries) * ch->msg_size);
- msg->flags = 0;
- } while (++get < (volatile s64) ch->remote_GP.get);
-}
-
-
-/*
- * Clear some of the msg flags in the remote message queue.
- */
-static inline void
-xpc_clear_remote_msgqueue_flags(struct xpc_channel *ch)
-{
- struct xpc_msg *msg;
- s64 put;
-
-
- put = ch->w_remote_GP.put;
- do {
- msg = (struct xpc_msg *) ((u64) ch->remote_msgqueue +
- (put % ch->remote_nentries) * ch->msg_size);
- msg->flags = 0;
- } while (++put < (volatile s64) ch->remote_GP.put);
-}
-
-
-static void
-xpc_process_msg_IPI(struct xpc_partition *part, int ch_number)
-{
- struct xpc_channel *ch = &part->channels[ch_number];
- int nmsgs_sent;
-
-
- ch->remote_GP = part->remote_GPs[ch_number];
-
-
- /* See what, if anything, has changed for each connected channel */
-
- xpc_msgqueue_ref(ch);
-
- if (ch->w_remote_GP.get == ch->remote_GP.get &&
- ch->w_remote_GP.put == ch->remote_GP.put) {
- /* nothing changed since GPs were last pulled */
- xpc_msgqueue_deref(ch);
- return;
- }
-
- if (!(ch->flags & XPC_C_CONNECTED)){
- xpc_msgqueue_deref(ch);
- return;
- }
-
-
- /*
- * First check to see if messages recently sent by us have been
- * received by the other side. (The remote GET value will have
- * changed since we last looked at it.)
- */
-
- if (ch->w_remote_GP.get != ch->remote_GP.get) {
-
- /*
- * We need to notify any senders that want to be notified
- * that their sent messages have been received by their
- * intended recipients. We need to do this before updating
- * w_remote_GP.get so that we don't allocate the same message
- * queue entries prematurely (see xpc_allocate_msg()).
- */
- if (atomic_read(&ch->n_to_notify) > 0) {
- /*
- * Notify senders that messages sent have been
- * received and delivered by the other side.
- */
- xpc_notify_senders(ch, xpcMsgDelivered,
- ch->remote_GP.get);
- }
-
- /*
- * Clear msg->flags in previously sent messages, so that
- * they're ready for xpc_allocate_msg().
- */
- xpc_clear_local_msgqueue_flags(ch);
-
- ch->w_remote_GP.get = ch->remote_GP.get;
-
- dev_dbg(xpc_chan, "w_remote_GP.get changed to %ld, partid=%d, "
- "channel=%d\n", ch->w_remote_GP.get, ch->partid,
- ch->number);
-
- /*
- * If anyone was waiting for message queue entries to become
- * available, wake them up.
- */
- if (atomic_read(&ch->n_on_msg_allocate_wq) > 0) {
- wake_up(&ch->msg_allocate_wq);
- }
- }
-
-
- /*
- * Now check for newly sent messages by the other side. (The remote
- * PUT value will have changed since we last looked at it.)
- */
-
- if (ch->w_remote_GP.put != ch->remote_GP.put) {
- /*
- * Clear msg->flags in previously received messages, so that
- * they're ready for xpc_get_deliverable_msg().
- */
- xpc_clear_remote_msgqueue_flags(ch);
-
- ch->w_remote_GP.put = ch->remote_GP.put;
-
- dev_dbg(xpc_chan, "w_remote_GP.put changed to %ld, partid=%d, "
- "channel=%d\n", ch->w_remote_GP.put, ch->partid,
- ch->number);
-
- nmsgs_sent = ch->w_remote_GP.put - ch->w_local_GP.get;
- if (nmsgs_sent > 0) {
- dev_dbg(xpc_chan, "msgs waiting to be copied and "
- "delivered=%d, partid=%d, channel=%d\n",
- nmsgs_sent, ch->partid, ch->number);
-
- if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
- xpc_activate_kthreads(ch, nmsgs_sent);
- }
- }
- }
-
- xpc_msgqueue_deref(ch);
-}
-
-
-void
-xpc_process_channel_activity(struct xpc_partition *part)
-{
- unsigned long irq_flags;
- u64 IPI_amo, IPI_flags;
- struct xpc_channel *ch;
- int ch_number;
- u32 ch_flags;
-
-
- IPI_amo = xpc_get_IPI_flags(part);
-
- /*
- * Initiate channel connections for registered channels.
- *
- * For each connected channel that has pending messages activate idle
- * kthreads and/or create new kthreads as needed.
- */
-
- for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
- ch = &part->channels[ch_number];
-
-
- /*
- * Process any open or close related IPI flags, and then deal
- * with connecting or disconnecting the channel as required.
- */
-
- IPI_flags = XPC_GET_IPI_FLAGS(IPI_amo, ch_number);
-
- if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_flags)) {
- xpc_process_openclose_IPI(part, ch_number, IPI_flags);
- }
-
- ch_flags = ch->flags; /* need an atomic snapshot of flags */
-
- if (ch_flags & XPC_C_DISCONNECTING) {
- spin_lock_irqsave(&ch->lock, irq_flags);
- xpc_process_disconnect(ch, &irq_flags);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- continue;
- }
-
- if (part->act_state == XPC_P_DEACTIVATING) {
- continue;
- }
-
- if (!(ch_flags & XPC_C_CONNECTED)) {
- if (!(ch_flags & XPC_C_OPENREQUEST)) {
- DBUG_ON(ch_flags & XPC_C_SETUP);
- (void) xpc_connect_channel(ch);
- } else {
- spin_lock_irqsave(&ch->lock, irq_flags);
- xpc_process_connect(ch, &irq_flags);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- }
- continue;
- }
-
-
- /*
- * Process any message related IPI flags, this may involve the
- * activation of kthreads to deliver any pending messages sent
- * from the other partition.
- */
-
- if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_flags)) {
- xpc_process_msg_IPI(part, ch_number);
- }
- }
-}
-
-
-/*
- * XPC's heartbeat code calls this function to inform XPC that a partition is
- * going down. XPC responds by tearing down the XPartition Communication
- * infrastructure used for the just downed partition.
- *
- * XPC's heartbeat code will never call this function and xpc_partition_up()
- * at the same time. Nor will it ever make multiple calls to either function
- * at the same time.
- */
-void
-xpc_partition_going_down(struct xpc_partition *part, enum xpc_retval reason)
-{
- unsigned long irq_flags;
- int ch_number;
- struct xpc_channel *ch;
-
-
- dev_dbg(xpc_chan, "deactivating partition %d, reason=%d\n",
- XPC_PARTID(part), reason);
-
- if (!xpc_part_ref(part)) {
- /* infrastructure for this partition isn't currently set up */
- return;
- }
-
-
- /* disconnect channels associated with the partition going down */
-
- for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
- ch = &part->channels[ch_number];
-
- xpc_msgqueue_ref(ch);
- spin_lock_irqsave(&ch->lock, irq_flags);
-
- XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);
-
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- xpc_msgqueue_deref(ch);
- }
-
- xpc_wakeup_channel_mgr(part);
-
- xpc_part_deref(part);
-}
-
-
-/*
- * Teardown the infrastructure necessary to support XPartition Communication
- * between the specified remote partition and the local one.
- */
-void
-xpc_teardown_infrastructure(struct xpc_partition *part)
-{
- partid_t partid = XPC_PARTID(part);
-
-
- /*
- * We start off by making this partition inaccessible to local
- * processes by marking it as no longer setup. Then we make it
- * inaccessible to remote processes by clearing the XPC per partition
- * specific variable's magic # (which indicates that these variables
- * are no longer valid) and by ignoring all XPC notify IPIs sent to
- * this partition.
- */
-
- DBUG_ON(atomic_read(&part->nchannels_engaged) != 0);
- DBUG_ON(atomic_read(&part->nchannels_active) != 0);
- DBUG_ON(part->setup_state != XPC_P_SETUP);
- part->setup_state = XPC_P_WTEARDOWN;
-
- xpc_vars_part[partid].magic = 0;
-
-
- free_irq(SGI_XPC_NOTIFY, (void *) (u64) partid);
-
-
- /*
- * Before proceeding with the teardown we have to wait until all
- * existing references cease.
- */
- wait_event(part->teardown_wq, (atomic_read(&part->references) == 0));
-
-
- /* now we can begin tearing down the infrastructure */
-
- part->setup_state = XPC_P_TORNDOWN;
-
- /* in case we've still got outstanding timers registered... */
- del_timer_sync(&part->dropped_IPI_timer);
-
- kfree(part->remote_openclose_args_base);
- part->remote_openclose_args = NULL;
- kfree(part->local_openclose_args_base);
- part->local_openclose_args = NULL;
- kfree(part->remote_GPs_base);
- part->remote_GPs = NULL;
- kfree(part->local_GPs_base);
- part->local_GPs = NULL;
- kfree(part->channels);
- part->channels = NULL;
- part->local_IPI_amo_va = NULL;
-}
-
-
-/*
- * Called by XP at the time of channel connection registration to cause
- * XPC to establish connections to all currently active partitions.
- */
-void
-xpc_initiate_connect(int ch_number)
-{
- partid_t partid;
- struct xpc_partition *part;
- struct xpc_channel *ch;
-
-
- DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
-
- for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
- part = &xpc_partitions[partid];
-
- if (xpc_part_ref(part)) {
- ch = &part->channels[ch_number];
-
- /*
- * Initiate the establishment of a connection on the
- * newly registered channel to the remote partition.
- */
- xpc_wakeup_channel_mgr(part);
- xpc_part_deref(part);
- }
- }
-}
-
-
-void
-xpc_connected_callout(struct xpc_channel *ch)
-{
- /* let the registerer know that a connection has been established */
-
- if (ch->func != NULL) {
- dev_dbg(xpc_chan, "ch->func() called, reason=xpcConnected, "
- "partid=%d, channel=%d\n", ch->partid, ch->number);
-
- ch->func(xpcConnected, ch->partid, ch->number,
- (void *) (u64) ch->local_nentries, ch->key);
-
- dev_dbg(xpc_chan, "ch->func() returned, reason=xpcConnected, "
- "partid=%d, channel=%d\n", ch->partid, ch->number);
- }
-}
-
-
-/*
- * Called by XP at the time of channel connection unregistration to cause
- * XPC to teardown all current connections for the specified channel.
- *
- * Before returning xpc_initiate_disconnect() will wait until all connections
- * on the specified channel have been closed/torndown. So the caller can be
- * assured that they will not be receiving any more callouts from XPC to the
- * function they registered via xpc_connect().
- *
- * Arguments:
- *
- * ch_number - channel # to unregister.
- */
-void
-xpc_initiate_disconnect(int ch_number)
-{
- unsigned long irq_flags;
- partid_t partid;
- struct xpc_partition *part;
- struct xpc_channel *ch;
-
-
- DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
-
- /* initiate the channel disconnect for every active partition */
- for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
- part = &xpc_partitions[partid];
-
- if (xpc_part_ref(part)) {
- ch = &part->channels[ch_number];
- xpc_msgqueue_ref(ch);
-
- spin_lock_irqsave(&ch->lock, irq_flags);
-
- if (!(ch->flags & XPC_C_DISCONNECTED)) {
- ch->flags |= XPC_C_WDISCONNECT;
-
- XPC_DISCONNECT_CHANNEL(ch, xpcUnregistering,
- &irq_flags);
- }
-
- spin_unlock_irqrestore(&ch->lock, irq_flags);
-
- xpc_msgqueue_deref(ch);
- xpc_part_deref(part);
- }
- }
-
- xpc_disconnect_wait(ch_number);
-}
-
-
-/*
- * To disconnect a channel, and reflect it back to all who may be waiting.
- *
- * An OPEN is not allowed until XPC_C_DISCONNECTING is cleared by
- * xpc_process_disconnect(), and if set, XPC_C_WDISCONNECT is cleared by
- * xpc_disconnect_wait().
- *
- * THE CHANNEL IS TO BE LOCKED BY THE CALLER AND WILL REMAIN LOCKED UPON RETURN.
- */
-void
-xpc_disconnect_channel(const int line, struct xpc_channel *ch,
- enum xpc_retval reason, unsigned long *irq_flags)
-{
- u32 channel_was_connected = (ch->flags & XPC_C_CONNECTED);
-
-
- DBUG_ON(!spin_is_locked(&ch->lock));
-
- if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED)) {
- return;
- }
- DBUG_ON(!(ch->flags & (XPC_C_CONNECTING | XPC_C_CONNECTED)));
-
- dev_dbg(xpc_chan, "reason=%d, line=%d, partid=%d, channel=%d\n",
- reason, line, ch->partid, ch->number);
-
- XPC_SET_REASON(ch, reason, line);
-
- ch->flags |= (XPC_C_CLOSEREQUEST | XPC_C_DISCONNECTING);
- /* some of these may not have been set */
- ch->flags &= ~(XPC_C_OPENREQUEST | XPC_C_OPENREPLY |
- XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY |
- XPC_C_CONNECTING | XPC_C_CONNECTED);
-
- xpc_IPI_send_closerequest(ch, irq_flags);
-
- if (channel_was_connected) {
- ch->flags |= XPC_C_WASCONNECTED;
- }
-
- spin_unlock_irqrestore(&ch->lock, *irq_flags);
-
- /* wake all idle kthreads so they can exit */
- if (atomic_read(&ch->kthreads_idle) > 0) {
- wake_up_all(&ch->idle_wq);
-
- } else if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
- !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
- /* start a kthread that will do the xpcDisconnecting callout */
- xpc_create_kthreads(ch, 1, 1);
- }
-
- /* wake those waiting to allocate an entry from the local msg queue */
- if (atomic_read(&ch->n_on_msg_allocate_wq) > 0) {
- wake_up(&ch->msg_allocate_wq);
- }
-
- spin_lock_irqsave(&ch->lock, *irq_flags);
-}
-
-
-void
-xpc_disconnect_callout(struct xpc_channel *ch, enum xpc_retval reason)
-{
- /*
- * Let the channel's registerer know that the channel is being
- * disconnected. We don't want to do this if the registerer was never
- * informed of a connection being made.
- */
-
- if (ch->func != NULL) {
- dev_dbg(xpc_chan, "ch->func() called, reason=%d, partid=%d, "
- "channel=%d\n", reason, ch->partid, ch->number);
-
- ch->func(reason, ch->partid, ch->number, NULL, ch->key);
-
- dev_dbg(xpc_chan, "ch->func() returned, reason=%d, partid=%d, "
- "channel=%d\n", reason, ch->partid, ch->number);
- }
-}
-
-
-/*
- * Wait for a message entry to become available for the specified channel,
- * but don't wait any longer than 1 jiffy.
- */
-static enum xpc_retval
-xpc_allocate_msg_wait(struct xpc_channel *ch)
-{
- enum xpc_retval ret;
-
-
- if (ch->flags & XPC_C_DISCONNECTING) {
- DBUG_ON(ch->reason == xpcInterrupted); // >>> Is this true?
- return ch->reason;
- }
-
- atomic_inc(&ch->n_on_msg_allocate_wq);
- ret = interruptible_sleep_on_timeout(&ch->msg_allocate_wq, 1);
- atomic_dec(&ch->n_on_msg_allocate_wq);
-
- if (ch->flags & XPC_C_DISCONNECTING) {
- ret = ch->reason;
- DBUG_ON(ch->reason == xpcInterrupted); // >>> Is this true?
- } else if (ret == 0) {
- ret = xpcTimeout;
- } else {
- ret = xpcInterrupted;
- }
-
- return ret;
-}
-
-
-/*
- * Allocate an entry for a message from the message queue associated with the
- * specified channel.
- */
-static enum xpc_retval
-xpc_allocate_msg(struct xpc_channel *ch, u32 flags,
- struct xpc_msg **address_of_msg)
-{
- struct xpc_msg *msg;
- enum xpc_retval ret;
- s64 put;
-
-
- /* this reference will be dropped in xpc_send_msg() */
- xpc_msgqueue_ref(ch);
-
- if (ch->flags & XPC_C_DISCONNECTING) {
- xpc_msgqueue_deref(ch);
- return ch->reason;
- }
- if (!(ch->flags & XPC_C_CONNECTED)) {
- xpc_msgqueue_deref(ch);
- return xpcNotConnected;
- }
-
-
- /*
- * Get the next available message entry from the local message queue.
- * If none are available, we'll make sure that we grab the latest
- * GP values.
- */
- ret = xpcTimeout;
-
- while (1) {
-
- put = (volatile s64) ch->w_local_GP.put;
- if (put - (volatile s64) ch->w_remote_GP.get <
- ch->local_nentries) {
-
- /* There are available message entries. We need to try
- * to secure one for ourselves. We'll do this by trying
- * to increment w_local_GP.put as long as someone else
- * doesn't beat us to it. If they do, we'll have to
- * try again.
- */
- if (cmpxchg(&ch->w_local_GP.put, put, put + 1) ==
- put) {
- /* we got the entry referenced by put */
- break;
- }
- continue; /* try again */
- }
-
-
- /*
- * There aren't any available msg entries at this time.
- *
- * In waiting for a message entry to become available,
- * we set a timeout in case the other side is not
- * sending completion IPIs. This lets us fake an IPI
- * that will cause the IPI handler to fetch the latest
- * GP values as if an IPI was sent by the other side.
- */
- if (ret == xpcTimeout) {
- xpc_IPI_send_local_msgrequest(ch);
- }
-
- if (flags & XPC_NOWAIT) {
- xpc_msgqueue_deref(ch);
- return xpcNoWait;
- }
-
- ret = xpc_allocate_msg_wait(ch);
- if (ret != xpcInterrupted && ret != xpcTimeout) {
- xpc_msgqueue_deref(ch);
- return ret;
- }
- }
-
-
- /* get the message's address and initialize it */
- msg = (struct xpc_msg *) ((u64) ch->local_msgqueue +
- (put % ch->local_nentries) * ch->msg_size);
-
-
- DBUG_ON(msg->flags != 0);
- msg->number = put;
-
- dev_dbg(xpc_chan, "w_local_GP.put changed to %ld; msg=0x%p, "
- "msg_number=%ld, partid=%d, channel=%d\n", put + 1,
- (void *) msg, msg->number, ch->partid, ch->number);
-
- *address_of_msg = msg;
-
- return xpcSuccess;
-}
-
-
-/*
- * Allocate an entry for a message from the message queue associated with the
- * specified channel. NOTE that this routine can sleep waiting for a message
- * entry to become available. To not sleep, pass in the XPC_NOWAIT flag.
- *
- * Arguments:
- *
- * partid - ID of partition to which the channel is connected.
- * ch_number - channel #.
- * flags - see xpc.h for valid flags.
- * payload - address of the allocated payload area pointer (filled in on
- * return) in which the user-defined message is constructed.
- */
-enum xpc_retval
-xpc_initiate_allocate(partid_t partid, int ch_number, u32 flags, void **payload)
-{
- struct xpc_partition *part = &xpc_partitions[partid];
- enum xpc_retval ret = xpcUnknownReason;
- struct xpc_msg *msg = NULL;
-
-
- DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
- DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
-
- *payload = NULL;
-
- if (xpc_part_ref(part)) {
- ret = xpc_allocate_msg(&part->channels[ch_number], flags, &msg);
- xpc_part_deref(part);
-
- if (msg != NULL) {
- *payload = &msg->payload;
- }
- }
-
- return ret;
-}
-
-
-/*
- * Now we actually send the messages that are ready to be sent by advancing
- * the local message queue's Put value and then send an IPI to the recipient
- * partition.
- */
-static void
-xpc_send_msgs(struct xpc_channel *ch, s64 initial_put)
-{
- struct xpc_msg *msg;
- s64 put = initial_put + 1;
- int send_IPI = 0;
-
-
- while (1) {
-
- while (1) {
- if (put == (volatile s64) ch->w_local_GP.put) {
- break;
- }
-
- msg = (struct xpc_msg *) ((u64) ch->local_msgqueue +
- (put % ch->local_nentries) * ch->msg_size);
-
- if (!(msg->flags & XPC_M_READY)) {
- break;
- }
-
- put++;
- }
-
- if (put == initial_put) {
- /* nothing's changed */
- break;
- }
-
- if (cmpxchg_rel(&ch->local_GP->put, initial_put, put) !=
- initial_put) {
- /* someone else beat us to it */
- DBUG_ON((volatile s64) ch->local_GP->put < initial_put);
- break;
- }
-
- /* we just set the new value of local_GP->put */
-
- dev_dbg(xpc_chan, "local_GP->put changed to %ld, partid=%d, "
- "channel=%d\n", put, ch->partid, ch->number);
-
- send_IPI = 1;
-
- /*
- * We need to ensure that the message referenced by
- * local_GP->put is not XPC_M_READY or that local_GP->put
- * equals w_local_GP.put, so we'll go have a look.
- */
- initial_put = put;
- }
-
- if (send_IPI) {
- xpc_IPI_send_msgrequest(ch);
- }
-}
-
-
-/*
- * Common code that does the actual sending of the message by advancing the
- * local message queue's Put value and sends an IPI to the partition the
- * message is being sent to.
- */
-static enum xpc_retval
-xpc_send_msg(struct xpc_channel *ch, struct xpc_msg *msg, u8 notify_type,
- xpc_notify_func func, void *key)
-{
- enum xpc_retval ret = xpcSuccess;
- struct xpc_notify *notify = notify;
- s64 put, msg_number = msg->number;
-
-
- DBUG_ON(notify_type == XPC_N_CALL && func == NULL);
- DBUG_ON((((u64) msg - (u64) ch->local_msgqueue) / ch->msg_size) !=
- msg_number % ch->local_nentries);
- DBUG_ON(msg->flags & XPC_M_READY);
-
- if (ch->flags & XPC_C_DISCONNECTING) {
- /* drop the reference grabbed in xpc_allocate_msg() */
- xpc_msgqueue_deref(ch);
- return ch->reason;
- }
-
- if (notify_type != 0) {
- /*
- * Tell the remote side to send an ACK interrupt when the
- * message has been delivered.
- */
- msg->flags |= XPC_M_INTERRUPT;
-
- atomic_inc(&ch->n_to_notify);
-
- notify = &ch->notify_queue[msg_number % ch->local_nentries];
- notify->func = func;
- notify->key = key;
- notify->type = notify_type;
-
- // >>> is a mb() needed here?
-
- if (ch->flags & XPC_C_DISCONNECTING) {
- /*
- * An error occurred between our last error check and
- * this one. We will try to clear the type field from
- * the notify entry. If we succeed then
- * xpc_disconnect_channel() didn't already process
- * the notify entry.
- */
- if (cmpxchg(¬ify->type, notify_type, 0) ==
- notify_type) {
- atomic_dec(&ch->n_to_notify);
- ret = ch->reason;
- }
-
- /* drop the reference grabbed in xpc_allocate_msg() */
- xpc_msgqueue_deref(ch);
- return ret;
- }
- }
-
- msg->flags |= XPC_M_READY;
-
- /*
- * The preceding store of msg->flags must occur before the following
- * load of ch->local_GP->put.
- */
- mb();
-
- /* see if the message is next in line to be sent, if so send it */
-
- put = ch->local_GP->put;
- if (put == msg_number) {
- xpc_send_msgs(ch, put);
- }
-
- /* drop the reference grabbed in xpc_allocate_msg() */
- xpc_msgqueue_deref(ch);
- return ret;
-}
-
-
-/*
- * Send a message previously allocated using xpc_initiate_allocate() on the
- * specified channel connected to the specified partition.
- *
- * This routine will not wait for the message to be received, nor will
- * notification be given when it does happen. Once this routine has returned
- * the message entry allocated via xpc_initiate_allocate() is no longer
- * accessable to the caller.
- *
- * This routine, although called by users, does not call xpc_part_ref() to
- * ensure that the partition infrastructure is in place. It relies on the
- * fact that we called xpc_msgqueue_ref() in xpc_allocate_msg().
- *
- * Arguments:
- *
- * partid - ID of partition to which the channel is connected.
- * ch_number - channel # to send message on.
- * payload - pointer to the payload area allocated via
- * xpc_initiate_allocate().
- */
-enum xpc_retval
-xpc_initiate_send(partid_t partid, int ch_number, void *payload)
-{
- struct xpc_partition *part = &xpc_partitions[partid];
- struct xpc_msg *msg = XPC_MSG_ADDRESS(payload);
- enum xpc_retval ret;
-
-
- dev_dbg(xpc_chan, "msg=0x%p, partid=%d, channel=%d\n", (void *) msg,
- partid, ch_number);
-
- DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
- DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
- DBUG_ON(msg == NULL);
-
- ret = xpc_send_msg(&part->channels[ch_number], msg, 0, NULL, NULL);
-
- return ret;
-}
-
-
-/*
- * Send a message previously allocated using xpc_initiate_allocate on the
- * specified channel connected to the specified partition.
- *
- * This routine will not wait for the message to be sent. Once this routine
- * has returned the message entry allocated via xpc_initiate_allocate() is no
- * longer accessable to the caller.
- *
- * Once the remote end of the channel has received the message, the function
- * passed as an argument to xpc_initiate_send_notify() will be called. This
- * allows the sender to free up or re-use any buffers referenced by the
- * message, but does NOT mean the message has been processed at the remote
- * end by a receiver.
- *
- * If this routine returns an error, the caller's function will NOT be called.
- *
- * This routine, although called by users, does not call xpc_part_ref() to
- * ensure that the partition infrastructure is in place. It relies on the
- * fact that we called xpc_msgqueue_ref() in xpc_allocate_msg().
- *
- * Arguments:
- *
- * partid - ID of partition to which the channel is connected.
- * ch_number - channel # to send message on.
- * payload - pointer to the payload area allocated via
- * xpc_initiate_allocate().
- * func - function to call with asynchronous notification of message
- * receipt. THIS FUNCTION MUST BE NON-BLOCKING.
- * key - user-defined key to be passed to the function when it's called.
- */
-enum xpc_retval
-xpc_initiate_send_notify(partid_t partid, int ch_number, void *payload,
- xpc_notify_func func, void *key)
-{
- struct xpc_partition *part = &xpc_partitions[partid];
- struct xpc_msg *msg = XPC_MSG_ADDRESS(payload);
- enum xpc_retval ret;
-
-
- dev_dbg(xpc_chan, "msg=0x%p, partid=%d, channel=%d\n", (void *) msg,
- partid, ch_number);
-
- DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
- DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
- DBUG_ON(msg == NULL);
- DBUG_ON(func == NULL);
-
- ret = xpc_send_msg(&part->channels[ch_number], msg, XPC_N_CALL,
- func, key);
- return ret;
-}
-
-
-static struct xpc_msg *
-xpc_pull_remote_msg(struct xpc_channel *ch, s64 get)
-{
- struct xpc_partition *part = &xpc_partitions[ch->partid];
- struct xpc_msg *remote_msg, *msg;
- u32 msg_index, nmsgs;
- u64 msg_offset;
- enum xpc_retval ret;
-
-
- if (mutex_lock_interruptible(&ch->msg_to_pull_mutex) != 0) {
- /* we were interrupted by a signal */
- return NULL;
- }
-
- while (get >= ch->next_msg_to_pull) {
-
- /* pull as many messages as are ready and able to be pulled */
-
- msg_index = ch->next_msg_to_pull % ch->remote_nentries;
-
- DBUG_ON(ch->next_msg_to_pull >=
- (volatile s64) ch->w_remote_GP.put);
- nmsgs = (volatile s64) ch->w_remote_GP.put -
- ch->next_msg_to_pull;
- if (msg_index + nmsgs > ch->remote_nentries) {
- /* ignore the ones that wrap the msg queue for now */
- nmsgs = ch->remote_nentries - msg_index;
- }
-
- msg_offset = msg_index * ch->msg_size;
- msg = (struct xpc_msg *) ((u64) ch->remote_msgqueue +
- msg_offset);
- remote_msg = (struct xpc_msg *) (ch->remote_msgqueue_pa +
- msg_offset);
-
- if ((ret = xpc_pull_remote_cachelines(part, msg, remote_msg,
- nmsgs * ch->msg_size)) != xpcSuccess) {
-
- dev_dbg(xpc_chan, "failed to pull %d msgs starting with"
- " msg %ld from partition %d, channel=%d, "
- "ret=%d\n", nmsgs, ch->next_msg_to_pull,
- ch->partid, ch->number, ret);
-
- XPC_DEACTIVATE_PARTITION(part, ret);
-
- mutex_unlock(&ch->msg_to_pull_mutex);
- return NULL;
- }
-
- mb(); /* >>> this may not be needed, we're not sure */
-
- ch->next_msg_to_pull += nmsgs;
- }
-
- mutex_unlock(&ch->msg_to_pull_mutex);
-
- /* return the message we were looking for */
- msg_offset = (get % ch->remote_nentries) * ch->msg_size;
- msg = (struct xpc_msg *) ((u64) ch->remote_msgqueue + msg_offset);
-
- return msg;
-}
-
-
-/*
- * Get a message to be delivered.
- */
-static struct xpc_msg *
-xpc_get_deliverable_msg(struct xpc_channel *ch)
-{
- struct xpc_msg *msg = NULL;
- s64 get;
-
-
- do {
- if ((volatile u32) ch->flags & XPC_C_DISCONNECTING) {
- break;
- }
-
- get = (volatile s64) ch->w_local_GP.get;
- if (get == (volatile s64) ch->w_remote_GP.put) {
- break;
- }
-
- /* There are messages waiting to be pulled and delivered.
- * We need to try to secure one for ourselves. We'll do this
- * by trying to increment w_local_GP.get and hope that no one
- * else beats us to it. If they do, we'll we'll simply have
- * to try again for the next one.
- */
-
- if (cmpxchg(&ch->w_local_GP.get, get, get + 1) == get) {
- /* we got the entry referenced by get */
-
- dev_dbg(xpc_chan, "w_local_GP.get changed to %ld, "
- "partid=%d, channel=%d\n", get + 1,
- ch->partid, ch->number);
-
- /* pull the message from the remote partition */
-
- msg = xpc_pull_remote_msg(ch, get);
-
- DBUG_ON(msg != NULL && msg->number != get);
- DBUG_ON(msg != NULL && (msg->flags & XPC_M_DONE));
- DBUG_ON(msg != NULL && !(msg->flags & XPC_M_READY));
-
- break;
- }
-
- } while (1);
-
- return msg;
-}
-
-
-/*
- * Deliver a message to its intended recipient.
- */
-void
-xpc_deliver_msg(struct xpc_channel *ch)
-{
- struct xpc_msg *msg;
-
-
- if ((msg = xpc_get_deliverable_msg(ch)) != NULL) {
-
- /*
- * This ref is taken to protect the payload itself from being
- * freed before the user is finished with it, which the user
- * indicates by calling xpc_initiate_received().
- */
- xpc_msgqueue_ref(ch);
-
- atomic_inc(&ch->kthreads_active);
-
- if (ch->func != NULL) {
- dev_dbg(xpc_chan, "ch->func() called, msg=0x%p, "
- "msg_number=%ld, partid=%d, channel=%d\n",
- (void *) msg, msg->number, ch->partid,
- ch->number);
-
- /* deliver the message to its intended recipient */
- ch->func(xpcMsgReceived, ch->partid, ch->number,
- &msg->payload, ch->key);
-
- dev_dbg(xpc_chan, "ch->func() returned, msg=0x%p, "
- "msg_number=%ld, partid=%d, channel=%d\n",
- (void *) msg, msg->number, ch->partid,
- ch->number);
- }
-
- atomic_dec(&ch->kthreads_active);
- }
-}
-
-
-/*
- * Now we actually acknowledge the messages that have been delivered and ack'd
- * by advancing the cached remote message queue's Get value and if requested
- * send an IPI to the message sender's partition.
- */
-static void
-xpc_acknowledge_msgs(struct xpc_channel *ch, s64 initial_get, u8 msg_flags)
-{
- struct xpc_msg *msg;
- s64 get = initial_get + 1;
- int send_IPI = 0;
-
-
- while (1) {
-
- while (1) {
- if (get == (volatile s64) ch->w_local_GP.get) {
- break;
- }
-
- msg = (struct xpc_msg *) ((u64) ch->remote_msgqueue +
- (get % ch->remote_nentries) * ch->msg_size);
-
- if (!(msg->flags & XPC_M_DONE)) {
- break;
- }
-
- msg_flags |= msg->flags;
- get++;
- }
-
- if (get == initial_get) {
- /* nothing's changed */
- break;
- }
-
- if (cmpxchg_rel(&ch->local_GP->get, initial_get, get) !=
- initial_get) {
- /* someone else beat us to it */
- DBUG_ON((volatile s64) ch->local_GP->get <=
- initial_get);
- break;
- }
-
- /* we just set the new value of local_GP->get */
-
- dev_dbg(xpc_chan, "local_GP->get changed to %ld, partid=%d, "
- "channel=%d\n", get, ch->partid, ch->number);
-
- send_IPI = (msg_flags & XPC_M_INTERRUPT);
-
- /*
- * We need to ensure that the message referenced by
- * local_GP->get is not XPC_M_DONE or that local_GP->get
- * equals w_local_GP.get, so we'll go have a look.
- */
- initial_get = get;
- }
-
- if (send_IPI) {
- xpc_IPI_send_msgrequest(ch);
- }
-}
-
-
-/*
- * Acknowledge receipt of a delivered message.
- *
- * If a message has XPC_M_INTERRUPT set, send an interrupt to the partition
- * that sent the message.
- *
- * This function, although called by users, does not call xpc_part_ref() to
- * ensure that the partition infrastructure is in place. It relies on the
- * fact that we called xpc_msgqueue_ref() in xpc_deliver_msg().
- *
- * Arguments:
- *
- * partid - ID of partition to which the channel is connected.
- * ch_number - channel # message received on.
- * payload - pointer to the payload area allocated via
- * xpc_initiate_allocate().
- */
-void
-xpc_initiate_received(partid_t partid, int ch_number, void *payload)
-{
- struct xpc_partition *part = &xpc_partitions[partid];
- struct xpc_channel *ch;
- struct xpc_msg *msg = XPC_MSG_ADDRESS(payload);
- s64 get, msg_number = msg->number;
-
-
- DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
- DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
-
- ch = &part->channels[ch_number];
-
- dev_dbg(xpc_chan, "msg=0x%p, msg_number=%ld, partid=%d, channel=%d\n",
- (void *) msg, msg_number, ch->partid, ch->number);
-
- DBUG_ON((((u64) msg - (u64) ch->remote_msgqueue) / ch->msg_size) !=
- msg_number % ch->remote_nentries);
- DBUG_ON(msg->flags & XPC_M_DONE);
-
- msg->flags |= XPC_M_DONE;
-
- /*
- * The preceding store of msg->flags must occur before the following
- * load of ch->local_GP->get.
- */
- mb();
-
- /*
- * See if this message is next in line to be acknowledged as having
- * been delivered.
- */
- get = ch->local_GP->get;
- if (get == msg_number) {
- xpc_acknowledge_msgs(ch, get, msg->flags);
- }
-
- /* the call to xpc_msgqueue_ref() was done by xpc_deliver_msg() */
- xpc_msgqueue_deref(ch);
-}
-
+++ /dev/null
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (c) 2004-2007 Silicon Graphics, Inc. All Rights Reserved.
- */
-
-
-/*
- * Cross Partition Communication (XPC) support - standard version.
- *
- * XPC provides a message passing capability that crosses partition
- * boundaries. This module is made up of two parts:
- *
- * partition This part detects the presence/absence of other
- * partitions. It provides a heartbeat and monitors
- * the heartbeats of other partitions.
- *
- * channel This part manages the channels and sends/receives
- * messages across them to/from other partitions.
- *
- * There are a couple of additional functions residing in XP, which
- * provide an interface to XPC for its users.
- *
- *
- * Caveats:
- *
- * . We currently have no way to determine which nasid an IPI came
- * from. Thus, xpc_IPI_send() does a remote AMO write followed by
- * an IPI. The AMO indicates where data is to be pulled from, so
- * after the IPI arrives, the remote partition checks the AMO word.
- * The IPI can actually arrive before the AMO however, so other code
- * must periodically check for this case. Also, remote AMO operations
- * do not reliably time out. Thus we do a remote PIO read solely to
- * know whether the remote partition is down and whether we should
- * stop sending IPIs to it. This remote PIO read operation is set up
- * in a special nofault region so SAL knows to ignore (and cleanup)
- * any errors due to the remote AMO write, PIO read, and/or PIO
- * write operations.
- *
- * If/when new hardware solves this IPI problem, we should abandon
- * the current approach.
- *
- */
-
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/syscalls.h>
-#include <linux/cache.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/reboot.h>
-#include <linux/completion.h>
-#include <linux/kdebug.h>
-#include <asm/sn/intr.h>
-#include <asm/sn/sn_sal.h>
-#include <asm/uaccess.h>
-#include <asm/sn/xpc.h>
-
-
-/* define two XPC debug device structures to be used with dev_dbg() et al */
-
-struct device_driver xpc_dbg_name = {
- .name = "xpc"
-};
-
-struct device xpc_part_dbg_subname = {
- .bus_id = {0}, /* set to "part" at xpc_init() time */
- .driver = &xpc_dbg_name
-};
-
-struct device xpc_chan_dbg_subname = {
- .bus_id = {0}, /* set to "chan" at xpc_init() time */
- .driver = &xpc_dbg_name
-};
-
-struct device *xpc_part = &xpc_part_dbg_subname;
-struct device *xpc_chan = &xpc_chan_dbg_subname;
-
-
-static int xpc_kdebug_ignore;
-
-
-/* systune related variables for /proc/sys directories */
-
-static int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL;
-static int xpc_hb_min_interval = 1;
-static int xpc_hb_max_interval = 10;
-
-static int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_INTERVAL;
-static int xpc_hb_check_min_interval = 10;
-static int xpc_hb_check_max_interval = 120;
-
-int xpc_disengage_request_timelimit = XPC_DISENGAGE_REQUEST_DEFAULT_TIMELIMIT;
-static int xpc_disengage_request_min_timelimit = 0;
-static int xpc_disengage_request_max_timelimit = 120;
-
-static ctl_table xpc_sys_xpc_hb_dir[] = {
- {
- .ctl_name = CTL_UNNUMBERED,
- .procname = "hb_interval",
- .data = &xpc_hb_interval,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_minmax,
- .strategy = &sysctl_intvec,
- .extra1 = &xpc_hb_min_interval,
- .extra2 = &xpc_hb_max_interval
- },
- {
- .ctl_name = CTL_UNNUMBERED,
- .procname = "hb_check_interval",
- .data = &xpc_hb_check_interval,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_minmax,
- .strategy = &sysctl_intvec,
- .extra1 = &xpc_hb_check_min_interval,
- .extra2 = &xpc_hb_check_max_interval
- },
- {}
-};
-static ctl_table xpc_sys_xpc_dir[] = {
- {
- .ctl_name = CTL_UNNUMBERED,
- .procname = "hb",
- .mode = 0555,
- .child = xpc_sys_xpc_hb_dir
- },
- {
- .ctl_name = CTL_UNNUMBERED,
- .procname = "disengage_request_timelimit",
- .data = &xpc_disengage_request_timelimit,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_minmax,
- .strategy = &sysctl_intvec,
- .extra1 = &xpc_disengage_request_min_timelimit,
- .extra2 = &xpc_disengage_request_max_timelimit
- },
- {}
-};
-static ctl_table xpc_sys_dir[] = {
- {
- .ctl_name = CTL_UNNUMBERED,
- .procname = "xpc",
- .mode = 0555,
- .child = xpc_sys_xpc_dir
- },
- {}
-};
-static struct ctl_table_header *xpc_sysctl;
-
-/* non-zero if any remote partition disengage request was timed out */
-int xpc_disengage_request_timedout;
-
-/* #of IRQs received */
-static atomic_t xpc_act_IRQ_rcvd;
-
-/* IRQ handler notifies this wait queue on receipt of an IRQ */
-static DECLARE_WAIT_QUEUE_HEAD(xpc_act_IRQ_wq);
-
-static unsigned long xpc_hb_check_timeout;
-
-/* notification that the xpc_hb_checker thread has exited */
-static DECLARE_COMPLETION(xpc_hb_checker_exited);
-
-/* notification that the xpc_discovery thread has exited */
-static DECLARE_COMPLETION(xpc_discovery_exited);
-
-
-static struct timer_list xpc_hb_timer;
-
-
-static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *);
-
-
-static int xpc_system_reboot(struct notifier_block *, unsigned long, void *);
-static struct notifier_block xpc_reboot_notifier = {
- .notifier_call = xpc_system_reboot,
-};
-
-static int xpc_system_die(struct notifier_block *, unsigned long, void *);
-static struct notifier_block xpc_die_notifier = {
- .notifier_call = xpc_system_die,
-};
-
-
-/*
- * Timer function to enforce the timelimit on the partition disengage request.
- */
-static void
-xpc_timeout_partition_disengage_request(unsigned long data)
-{
- struct xpc_partition *part = (struct xpc_partition *) data;
-
-
- DBUG_ON(time_before(jiffies, part->disengage_request_timeout));
-
- (void) xpc_partition_disengaged(part);
-
- DBUG_ON(part->disengage_request_timeout != 0);
- DBUG_ON(xpc_partition_engaged(1UL << XPC_PARTID(part)) != 0);
-}
-
-
-/*
- * Notify the heartbeat check thread that an IRQ has been received.
- */
-static irqreturn_t
-xpc_act_IRQ_handler(int irq, void *dev_id)
-{
- atomic_inc(&xpc_act_IRQ_rcvd);
- wake_up_interruptible(&xpc_act_IRQ_wq);
- return IRQ_HANDLED;
-}
-
-
-/*
- * Timer to produce the heartbeat. The timer structures function is
- * already set when this is initially called. A tunable is used to
- * specify when the next timeout should occur.
- */
-static void
-xpc_hb_beater(unsigned long dummy)
-{
- xpc_vars->heartbeat++;
-
- if (time_after_eq(jiffies, xpc_hb_check_timeout)) {
- wake_up_interruptible(&xpc_act_IRQ_wq);
- }
-
- xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ);
- add_timer(&xpc_hb_timer);
-}
-
-
-/*
- * This thread is responsible for nearly all of the partition
- * activation/deactivation.
- */
-static int
-xpc_hb_checker(void *ignore)
-{
- int last_IRQ_count = 0;
- int new_IRQ_count;
- int force_IRQ=0;
-
-
- /* this thread was marked active by xpc_hb_init() */
-
- daemonize(XPC_HB_CHECK_THREAD_NAME);
-
- set_cpus_allowed(current, cpumask_of_cpu(XPC_HB_CHECK_CPU));
-
- /* set our heartbeating to other partitions into motion */
- xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ);
- xpc_hb_beater(0);
-
- while (!(volatile int) xpc_exiting) {
-
- dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have "
- "been received\n",
- (int) (xpc_hb_check_timeout - jiffies),
- atomic_read(&xpc_act_IRQ_rcvd) - last_IRQ_count);
-
-
- /* checking of remote heartbeats is skewed by IRQ handling */
- if (time_after_eq(jiffies, xpc_hb_check_timeout)) {
- dev_dbg(xpc_part, "checking remote heartbeats\n");
- xpc_check_remote_hb();
-
- /*
- * We need to periodically recheck to ensure no
- * IPI/AMO pairs have been missed. That check
- * must always reset xpc_hb_check_timeout.
- */
- force_IRQ = 1;
- }
-
-
- /* check for outstanding IRQs */
- new_IRQ_count = atomic_read(&xpc_act_IRQ_rcvd);
- if (last_IRQ_count < new_IRQ_count || force_IRQ != 0) {
- force_IRQ = 0;
-
- dev_dbg(xpc_part, "found an IRQ to process; will be "
- "resetting xpc_hb_check_timeout\n");
-
- last_IRQ_count += xpc_identify_act_IRQ_sender();
- if (last_IRQ_count < new_IRQ_count) {
- /* retry once to help avoid missing AMO */
- (void) xpc_identify_act_IRQ_sender();
- }
- last_IRQ_count = new_IRQ_count;
-
- xpc_hb_check_timeout = jiffies +
- (xpc_hb_check_interval * HZ);
- }
-
- /* wait for IRQ or timeout */
- (void) wait_event_interruptible(xpc_act_IRQ_wq,
- (last_IRQ_count < atomic_read(&xpc_act_IRQ_rcvd) ||
- time_after_eq(jiffies, xpc_hb_check_timeout) ||
- (volatile int) xpc_exiting));
- }
-
- dev_dbg(xpc_part, "heartbeat checker is exiting\n");
-
-
- /* mark this thread as having exited */
- complete(&xpc_hb_checker_exited);
- return 0;
-}
-
-
-/*
- * This thread will attempt to discover other partitions to activate
- * based on info provided by SAL. This new thread is short lived and
- * will exit once discovery is complete.
- */
-static int
-xpc_initiate_discovery(void *ignore)
-{
- daemonize(XPC_DISCOVERY_THREAD_NAME);
-
- xpc_discovery();
-
- dev_dbg(xpc_part, "discovery thread is exiting\n");
-
- /* mark this thread as having exited */
- complete(&xpc_discovery_exited);
- return 0;
-}
-
-
-/*
- * Establish first contact with the remote partititon. This involves pulling
- * the XPC per partition variables from the remote partition and waiting for
- * the remote partition to pull ours.
- */
-static enum xpc_retval
-xpc_make_first_contact(struct xpc_partition *part)
-{
- enum xpc_retval ret;
-
-
- while ((ret = xpc_pull_remote_vars_part(part)) != xpcSuccess) {
- if (ret != xpcRetry) {
- XPC_DEACTIVATE_PARTITION(part, ret);
- return ret;
- }
-
- dev_dbg(xpc_chan, "waiting to make first contact with "
- "partition %d\n", XPC_PARTID(part));
-
- /* wait a 1/4 of a second or so */
- (void) msleep_interruptible(250);
-
- if (part->act_state == XPC_P_DEACTIVATING) {
- return part->reason;
- }
- }
-
- return xpc_mark_partition_active(part);
-}
-
-
-/*
- * The first kthread assigned to a newly activated partition is the one
- * created by XPC HB with which it calls xpc_partition_up(). XPC hangs on to
- * that kthread until the partition is brought down, at which time that kthread
- * returns back to XPC HB. (The return of that kthread will signify to XPC HB
- * that XPC has dismantled all communication infrastructure for the associated
- * partition.) This kthread becomes the channel manager for that partition.
- *
- * Each active partition has a channel manager, who, besides connecting and
- * disconnecting channels, will ensure that each of the partition's connected
- * channels has the required number of assigned kthreads to get the work done.
- */
-static void
-xpc_channel_mgr(struct xpc_partition *part)
-{
- while (part->act_state != XPC_P_DEACTIVATING ||
- atomic_read(&part->nchannels_active) > 0 ||
- !xpc_partition_disengaged(part)) {
-
- xpc_process_channel_activity(part);
-
-
- /*
- * Wait until we've been requested to activate kthreads or
- * all of the channel's message queues have been torn down or
- * a signal is pending.
- *
- * The channel_mgr_requests is set to 1 after being awakened,
- * This is done to prevent the channel mgr from making one pass
- * through the loop for each request, since he will
- * be servicing all the requests in one pass. The reason it's
- * set to 1 instead of 0 is so that other kthreads will know
- * that the channel mgr is running and won't bother trying to
- * wake him up.
- */
- atomic_dec(&part->channel_mgr_requests);
- (void) wait_event_interruptible(part->channel_mgr_wq,
- (atomic_read(&part->channel_mgr_requests) > 0 ||
- (volatile u64) part->local_IPI_amo != 0 ||
- ((volatile u8) part->act_state ==
- XPC_P_DEACTIVATING &&
- atomic_read(&part->nchannels_active) == 0 &&
- xpc_partition_disengaged(part))));
- atomic_set(&part->channel_mgr_requests, 1);
-
- // >>> Does it need to wakeup periodically as well? In case we
- // >>> miscalculated the #of kthreads to wakeup or create?
- }
-}
-
-
-/*
- * When XPC HB determines that a partition has come up, it will create a new
- * kthread and that kthread will call this function to attempt to set up the
- * basic infrastructure used for Cross Partition Communication with the newly
- * upped partition.
- *
- * The kthread that was created by XPC HB and which setup the XPC
- * infrastructure will remain assigned to the partition until the partition
- * goes down. At which time the kthread will teardown the XPC infrastructure
- * and then exit.
- *
- * XPC HB will put the remote partition's XPC per partition specific variables
- * physical address into xpc_partitions[partid].remote_vars_part_pa prior to
- * calling xpc_partition_up().
- */
-static void
-xpc_partition_up(struct xpc_partition *part)
-{
- DBUG_ON(part->channels != NULL);
-
- dev_dbg(xpc_chan, "activating partition %d\n", XPC_PARTID(part));
-
- if (xpc_setup_infrastructure(part) != xpcSuccess) {
- return;
- }
-
- /*
- * The kthread that XPC HB called us with will become the
- * channel manager for this partition. It will not return
- * back to XPC HB until the partition's XPC infrastructure
- * has been dismantled.
- */
-
- (void) xpc_part_ref(part); /* this will always succeed */
-
- if (xpc_make_first_contact(part) == xpcSuccess) {
- xpc_channel_mgr(part);
- }
-
- xpc_part_deref(part);
-
- xpc_teardown_infrastructure(part);
-}
-
-
-static int
-xpc_activating(void *__partid)
-{
- partid_t partid = (u64) __partid;
- struct xpc_partition *part = &xpc_partitions[partid];
- unsigned long irq_flags;
- struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
- int ret;
-
-
- DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
-
- spin_lock_irqsave(&part->act_lock, irq_flags);
-
- if (part->act_state == XPC_P_DEACTIVATING) {
- part->act_state = XPC_P_INACTIVE;
- spin_unlock_irqrestore(&part->act_lock, irq_flags);
- part->remote_rp_pa = 0;
- return 0;
- }
-
- /* indicate the thread is activating */
- DBUG_ON(part->act_state != XPC_P_ACTIVATION_REQ);
- part->act_state = XPC_P_ACTIVATING;
-
- XPC_SET_REASON(part, 0, 0);
- spin_unlock_irqrestore(&part->act_lock, irq_flags);
-
- dev_dbg(xpc_part, "bringing partition %d up\n", partid);
-
- daemonize("xpc%02d", partid);
-
- /*
- * This thread needs to run at a realtime priority to prevent a
- * significant performance degradation.
- */
- ret = sched_setscheduler(current, SCHED_FIFO, ¶m);
- if (ret != 0) {
- dev_warn(xpc_part, "unable to set pid %d to a realtime "
- "priority, ret=%d\n", current->pid, ret);
- }
-
- /* allow this thread and its children to run on any CPU */
- set_cpus_allowed(current, CPU_MASK_ALL);
-
- /*
- * Register the remote partition's AMOs with SAL so it can handle
- * and cleanup errors within that address range should the remote
- * partition go down. We don't unregister this range because it is
- * difficult to tell when outstanding writes to the remote partition
- * are finished and thus when it is safe to unregister. This should
- * not result in wasted space in the SAL xp_addr_region table because
- * we should get the same page for remote_amos_page_pa after module
- * reloads and system reboots.
- */
- if (sn_register_xp_addr_region(part->remote_amos_page_pa,
- PAGE_SIZE, 1) < 0) {
- dev_warn(xpc_part, "xpc_partition_up(%d) failed to register "
- "xp_addr region\n", partid);
-
- spin_lock_irqsave(&part->act_lock, irq_flags);
- part->act_state = XPC_P_INACTIVE;
- XPC_SET_REASON(part, xpcPhysAddrRegFailed, __LINE__);
- spin_unlock_irqrestore(&part->act_lock, irq_flags);
- part->remote_rp_pa = 0;
- return 0;
- }
-
- xpc_allow_hb(partid, xpc_vars);
- xpc_IPI_send_activated(part);
-
-
- /*
- * xpc_partition_up() holds this thread and marks this partition as
- * XPC_P_ACTIVE by calling xpc_hb_mark_active().
- */
- (void) xpc_partition_up(part);
-
- xpc_disallow_hb(partid, xpc_vars);
- xpc_mark_partition_inactive(part);
-
- if (part->reason == xpcReactivating) {
- /* interrupting ourselves results in activating partition */
- xpc_IPI_send_reactivate(part);
- }
-
- return 0;
-}
-
-
-void
-xpc_activate_partition(struct xpc_partition *part)
-{
- partid_t partid = XPC_PARTID(part);
- unsigned long irq_flags;
- pid_t pid;
-
-
- spin_lock_irqsave(&part->act_lock, irq_flags);
-
- DBUG_ON(part->act_state != XPC_P_INACTIVE);
-
- part->act_state = XPC_P_ACTIVATION_REQ;
- XPC_SET_REASON(part, xpcCloneKThread, __LINE__);
-
- spin_unlock_irqrestore(&part->act_lock, irq_flags);
-
- pid = kernel_thread(xpc_activating, (void *) ((u64) partid), 0);
-
- if (unlikely(pid <= 0)) {
- spin_lock_irqsave(&part->act_lock, irq_flags);
- part->act_state = XPC_P_INACTIVE;
- XPC_SET_REASON(part, xpcCloneKThreadFailed, __LINE__);
- spin_unlock_irqrestore(&part->act_lock, irq_flags);
- }
-}
-
-
-/*
- * Handle the receipt of a SGI_XPC_NOTIFY IRQ by seeing whether the specified
- * partition actually sent it. Since SGI_XPC_NOTIFY IRQs may be shared by more
- * than one partition, we use an AMO_t structure per partition to indicate
- * whether a partition has sent an IPI or not. >>> If it has, then wake up the
- * associated kthread to handle it.
- *
- * All SGI_XPC_NOTIFY IRQs received by XPC are the result of IPIs sent by XPC
- * running on other partitions.
- *
- * Noteworthy Arguments:
- *
- * irq - Interrupt ReQuest number. NOT USED.
- *
- * dev_id - partid of IPI's potential sender.
- */
-irqreturn_t
-xpc_notify_IRQ_handler(int irq, void *dev_id)
-{
- partid_t partid = (partid_t) (u64) dev_id;
- struct xpc_partition *part = &xpc_partitions[partid];
-
-
- DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
-
- if (xpc_part_ref(part)) {
- xpc_check_for_channel_activity(part);
-
- xpc_part_deref(part);
- }
- return IRQ_HANDLED;
-}
-
-
-/*
- * Check to see if xpc_notify_IRQ_handler() dropped any IPIs on the floor
- * because the write to their associated IPI amo completed after the IRQ/IPI
- * was received.
- */
-void
-xpc_dropped_IPI_check(struct xpc_partition *part)
-{
- if (xpc_part_ref(part)) {
- xpc_check_for_channel_activity(part);
-
- part->dropped_IPI_timer.expires = jiffies +
- XPC_P_DROPPED_IPI_WAIT;
- add_timer(&part->dropped_IPI_timer);
- xpc_part_deref(part);
- }
-}
-
-
-void
-xpc_activate_kthreads(struct xpc_channel *ch, int needed)
-{
- int idle = atomic_read(&ch->kthreads_idle);
- int assigned = atomic_read(&ch->kthreads_assigned);
- int wakeup;
-
-
- DBUG_ON(needed <= 0);
-
- if (idle > 0) {
- wakeup = (needed > idle) ? idle : needed;
- needed -= wakeup;
-
- dev_dbg(xpc_chan, "wakeup %d idle kthreads, partid=%d, "
- "channel=%d\n", wakeup, ch->partid, ch->number);
-
- /* only wakeup the requested number of kthreads */
- wake_up_nr(&ch->idle_wq, wakeup);
- }
-
- if (needed <= 0) {
- return;
- }
-
- if (needed + assigned > ch->kthreads_assigned_limit) {
- needed = ch->kthreads_assigned_limit - assigned;
- // >>>should never be less than 0
- if (needed <= 0) {
- return;
- }
- }
-
- dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n",
- needed, ch->partid, ch->number);
-
- xpc_create_kthreads(ch, needed, 0);
-}
-
-
-/*
- * This function is where XPC's kthreads wait for messages to deliver.
- */
-static void
-xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch)
-{
- do {
- /* deliver messages to their intended recipients */
-
- while ((volatile s64) ch->w_local_GP.get <
- (volatile s64) ch->w_remote_GP.put &&
- !((volatile u32) ch->flags &
- XPC_C_DISCONNECTING)) {
- xpc_deliver_msg(ch);
- }
-
- if (atomic_inc_return(&ch->kthreads_idle) >
- ch->kthreads_idle_limit) {
- /* too many idle kthreads on this channel */
- atomic_dec(&ch->kthreads_idle);
- break;
- }
-
- dev_dbg(xpc_chan, "idle kthread calling "
- "wait_event_interruptible_exclusive()\n");
-
- (void) wait_event_interruptible_exclusive(ch->idle_wq,
- ((volatile s64) ch->w_local_GP.get <
- (volatile s64) ch->w_remote_GP.put ||
- ((volatile u32) ch->flags &
- XPC_C_DISCONNECTING)));
-
- atomic_dec(&ch->kthreads_idle);
-
- } while (!((volatile u32) ch->flags & XPC_C_DISCONNECTING));
-}
-
-
-static int
-xpc_daemonize_kthread(void *args)
-{
- partid_t partid = XPC_UNPACK_ARG1(args);
- u16 ch_number = XPC_UNPACK_ARG2(args);
- struct xpc_partition *part = &xpc_partitions[partid];
- struct xpc_channel *ch;
- int n_needed;
- unsigned long irq_flags;
-
-
- daemonize("xpc%02dc%d", partid, ch_number);
-
- dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n",
- partid, ch_number);
-
- ch = &part->channels[ch_number];
-
- if (!(ch->flags & XPC_C_DISCONNECTING)) {
-
- /* let registerer know that connection has been established */
-
- spin_lock_irqsave(&ch->lock, irq_flags);
- if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) {
- ch->flags |= XPC_C_CONNECTEDCALLOUT;
- spin_unlock_irqrestore(&ch->lock, irq_flags);
-
- xpc_connected_callout(ch);
-
- spin_lock_irqsave(&ch->lock, irq_flags);
- ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE;
- spin_unlock_irqrestore(&ch->lock, irq_flags);
-
- /*
- * It is possible that while the callout was being
- * made that the remote partition sent some messages.
- * If that is the case, we may need to activate
- * additional kthreads to help deliver them. We only
- * need one less than total #of messages to deliver.
- */
- n_needed = ch->w_remote_GP.put - ch->w_local_GP.get - 1;
- if (n_needed > 0 &&
- !(ch->flags & XPC_C_DISCONNECTING)) {
- xpc_activate_kthreads(ch, n_needed);
- }
- } else {
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- }
-
- xpc_kthread_waitmsgs(part, ch);
- }
-
- /* let registerer know that connection is disconnecting */
-
- spin_lock_irqsave(&ch->lock, irq_flags);
- if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
- !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
- ch->flags |= XPC_C_DISCONNECTINGCALLOUT;
- spin_unlock_irqrestore(&ch->lock, irq_flags);
-
- xpc_disconnect_callout(ch, xpcDisconnecting);
-
- spin_lock_irqsave(&ch->lock, irq_flags);
- ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE;
- }
- spin_unlock_irqrestore(&ch->lock, irq_flags);
-
- if (atomic_dec_return(&ch->kthreads_assigned) == 0) {
- if (atomic_dec_return(&part->nchannels_engaged) == 0) {
- xpc_mark_partition_disengaged(part);
- xpc_IPI_send_disengage(part);
- }
- }
-
- xpc_msgqueue_deref(ch);
-
- dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n",
- partid, ch_number);
-
- xpc_part_deref(part);
- return 0;
-}
-
-
-/*
- * For each partition that XPC has established communications with, there is
- * a minimum of one kernel thread assigned to perform any operation that
- * may potentially sleep or block (basically the callouts to the asynchronous
- * functions registered via xpc_connect()).
- *
- * Additional kthreads are created and destroyed by XPC as the workload
- * demands.
- *
- * A kthread is assigned to one of the active channels that exists for a given
- * partition.
- */
-void
-xpc_create_kthreads(struct xpc_channel *ch, int needed,
- int ignore_disconnecting)
-{
- unsigned long irq_flags;
- pid_t pid;
- u64 args = XPC_PACK_ARGS(ch->partid, ch->number);
- struct xpc_partition *part = &xpc_partitions[ch->partid];
-
-
- while (needed-- > 0) {
-
- /*
- * The following is done on behalf of the newly created
- * kthread. That kthread is responsible for doing the
- * counterpart to the following before it exits.
- */
- if (ignore_disconnecting) {
- if (!atomic_inc_not_zero(&ch->kthreads_assigned)) {
- /* kthreads assigned had gone to zero */
- BUG_ON(!(ch->flags &
- XPC_C_DISCONNECTINGCALLOUT_MADE));
- break;
- }
-
- } else if (ch->flags & XPC_C_DISCONNECTING) {
- break;
-
- } else if (atomic_inc_return(&ch->kthreads_assigned) == 1) {
- if (atomic_inc_return(&part->nchannels_engaged) == 1)
- xpc_mark_partition_engaged(part);
- }
- (void) xpc_part_ref(part);
- xpc_msgqueue_ref(ch);
-
- pid = kernel_thread(xpc_daemonize_kthread, (void *) args, 0);
- if (pid < 0) {
- /* the fork failed */
-
- /*
- * NOTE: if (ignore_disconnecting &&
- * !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) is true,
- * then we'll deadlock if all other kthreads assigned
- * to this channel are blocked in the channel's
- * registerer, because the only thing that will unblock
- * them is the xpcDisconnecting callout that this
- * failed kernel_thread would have made.
- */
-
- if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
- atomic_dec_return(&part->nchannels_engaged) == 0) {
- xpc_mark_partition_disengaged(part);
- xpc_IPI_send_disengage(part);
- }
- xpc_msgqueue_deref(ch);
- xpc_part_deref(part);
-
- if (atomic_read(&ch->kthreads_assigned) <
- ch->kthreads_idle_limit) {
- /*
- * Flag this as an error only if we have an
- * insufficient #of kthreads for the channel
- * to function.
- */
- spin_lock_irqsave(&ch->lock, irq_flags);
- XPC_DISCONNECT_CHANNEL(ch, xpcLackOfResources,
- &irq_flags);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- }
- break;
- }
-
- ch->kthreads_created++; // >>> temporary debug only!!!
- }
-}
-
-
-void
-xpc_disconnect_wait(int ch_number)
-{
- unsigned long irq_flags;
- partid_t partid;
- struct xpc_partition *part;
- struct xpc_channel *ch;
- int wakeup_channel_mgr;
-
-
- /* now wait for all callouts to the caller's function to cease */
- for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
- part = &xpc_partitions[partid];
-
- if (!xpc_part_ref(part)) {
- continue;
- }
-
- ch = &part->channels[ch_number];
-
- if (!(ch->flags & XPC_C_WDISCONNECT)) {
- xpc_part_deref(part);
- continue;
- }
-
- wait_for_completion(&ch->wdisconnect_wait);
-
- spin_lock_irqsave(&ch->lock, irq_flags);
- DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));
- wakeup_channel_mgr = 0;
-
- if (ch->delayed_IPI_flags) {
- if (part->act_state != XPC_P_DEACTIVATING) {
- spin_lock(&part->IPI_lock);
- XPC_SET_IPI_FLAGS(part->local_IPI_amo,
- ch->number, ch->delayed_IPI_flags);
- spin_unlock(&part->IPI_lock);
- wakeup_channel_mgr = 1;
- }
- ch->delayed_IPI_flags = 0;
- }
-
- ch->flags &= ~XPC_C_WDISCONNECT;
- spin_unlock_irqrestore(&ch->lock, irq_flags);
-
- if (wakeup_channel_mgr) {
- xpc_wakeup_channel_mgr(part);
- }
-
- xpc_part_deref(part);
- }
-}
-
-
-static void
-xpc_do_exit(enum xpc_retval reason)
-{
- partid_t partid;
- int active_part_count, printed_waiting_msg = 0;
- struct xpc_partition *part;
- unsigned long printmsg_time, disengage_request_timeout = 0;
-
-
- /* a 'rmmod XPC' and a 'reboot' cannot both end up here together */
- DBUG_ON(xpc_exiting == 1);
-
- /*
- * Let the heartbeat checker thread and the discovery thread
- * (if one is running) know that they should exit. Also wake up
- * the heartbeat checker thread in case it's sleeping.
- */
- xpc_exiting = 1;
- wake_up_interruptible(&xpc_act_IRQ_wq);
-
- /* ignore all incoming interrupts */
- free_irq(SGI_XPC_ACTIVATE, NULL);
-
- /* wait for the discovery thread to exit */
- wait_for_completion(&xpc_discovery_exited);
-
- /* wait for the heartbeat checker thread to exit */
- wait_for_completion(&xpc_hb_checker_exited);
-
-
- /* sleep for a 1/3 of a second or so */
- (void) msleep_interruptible(300);
-
-
- /* wait for all partitions to become inactive */
-
- printmsg_time = jiffies + (XPC_DISENGAGE_PRINTMSG_INTERVAL * HZ);
- xpc_disengage_request_timedout = 0;
-
- do {
- active_part_count = 0;
-
- for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
- part = &xpc_partitions[partid];
-
- if (xpc_partition_disengaged(part) &&
- part->act_state == XPC_P_INACTIVE) {
- continue;
- }
-
- active_part_count++;
-
- XPC_DEACTIVATE_PARTITION(part, reason);
-
- if (part->disengage_request_timeout >
- disengage_request_timeout) {
- disengage_request_timeout =
- part->disengage_request_timeout;
- }
- }
-
- if (xpc_partition_engaged(-1UL)) {
- if (time_after(jiffies, printmsg_time)) {
- dev_info(xpc_part, "waiting for remote "
- "partitions to disengage, timeout in "
- "%ld seconds\n",
- (disengage_request_timeout - jiffies)
- / HZ);
- printmsg_time = jiffies +
- (XPC_DISENGAGE_PRINTMSG_INTERVAL * HZ);
- printed_waiting_msg = 1;
- }
-
- } else if (active_part_count > 0) {
- if (printed_waiting_msg) {
- dev_info(xpc_part, "waiting for local partition"
- " to disengage\n");
- printed_waiting_msg = 0;
- }
-
- } else {
- if (!xpc_disengage_request_timedout) {
- dev_info(xpc_part, "all partitions have "
- "disengaged\n");
- }
- break;
- }
-
- /* sleep for a 1/3 of a second or so */
- (void) msleep_interruptible(300);
-
- } while (1);
-
- DBUG_ON(xpc_partition_engaged(-1UL));
-
-
- /* indicate to others that our reserved page is uninitialized */
- xpc_rsvd_page->vars_pa = 0;
-
- /* now it's time to eliminate our heartbeat */
- del_timer_sync(&xpc_hb_timer);
- DBUG_ON(xpc_vars->heartbeating_to_mask != 0);
-
- if (reason == xpcUnloading) {
- /* take ourselves off of the reboot_notifier_list */
- (void) unregister_reboot_notifier(&xpc_reboot_notifier);
-
- /* take ourselves off of the die_notifier list */
- (void) unregister_die_notifier(&xpc_die_notifier);
- }
-
- /* close down protections for IPI operations */
- xpc_restrict_IPI_ops();
-
-
- /* clear the interface to XPC's functions */
- xpc_clear_interface();
-
- if (xpc_sysctl) {
- unregister_sysctl_table(xpc_sysctl);
- }
-
- kfree(xpc_remote_copy_buffer_base);
-}
-
-
-/*
- * This function is called when the system is being rebooted.
- */
-static int
-xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused)
-{
- enum xpc_retval reason;
-
-
- switch (event) {
- case SYS_RESTART:
- reason = xpcSystemReboot;
- break;
- case SYS_HALT:
- reason = xpcSystemHalt;
- break;
- case SYS_POWER_OFF:
- reason = xpcSystemPoweroff;
- break;
- default:
- reason = xpcSystemGoingDown;
- }
-
- xpc_do_exit(reason);
- return NOTIFY_DONE;
-}
-
-
-/*
- * Notify other partitions to disengage from all references to our memory.
- */
-static void
-xpc_die_disengage(void)
-{
- struct xpc_partition *part;
- partid_t partid;
- unsigned long engaged;
- long time, printmsg_time, disengage_request_timeout;
-
-
- /* keep xpc_hb_checker thread from doing anything (just in case) */
- xpc_exiting = 1;
-
- xpc_vars->heartbeating_to_mask = 0; /* indicate we're deactivated */
-
- for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
- part = &xpc_partitions[partid];
-
- if (!XPC_SUPPORTS_DISENGAGE_REQUEST(part->
- remote_vars_version)) {
-
- /* just in case it was left set by an earlier XPC */
- xpc_clear_partition_engaged(1UL << partid);
- continue;
- }
-
- if (xpc_partition_engaged(1UL << partid) ||
- part->act_state != XPC_P_INACTIVE) {
- xpc_request_partition_disengage(part);
- xpc_mark_partition_disengaged(part);
- xpc_IPI_send_disengage(part);
- }
- }
-
- time = rtc_time();
- printmsg_time = time +
- (XPC_DISENGAGE_PRINTMSG_INTERVAL * sn_rtc_cycles_per_second);
- disengage_request_timeout = time +
- (xpc_disengage_request_timelimit * sn_rtc_cycles_per_second);
-
- /* wait for all other partitions to disengage from us */
-
- while (1) {
- engaged = xpc_partition_engaged(-1UL);
- if (!engaged) {
- dev_info(xpc_part, "all partitions have disengaged\n");
- break;
- }
-
- time = rtc_time();
- if (time >= disengage_request_timeout) {
- for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
- if (engaged & (1UL << partid)) {
- dev_info(xpc_part, "disengage from "
- "remote partition %d timed "
- "out\n", partid);
- }
- }
- break;
- }
-
- if (time >= printmsg_time) {
- dev_info(xpc_part, "waiting for remote partitions to "
- "disengage, timeout in %ld seconds\n",
- (disengage_request_timeout - time) /
- sn_rtc_cycles_per_second);
- printmsg_time = time +
- (XPC_DISENGAGE_PRINTMSG_INTERVAL *
- sn_rtc_cycles_per_second);
- }
- }
-}
-
-
-/*
- * This function is called when the system is being restarted or halted due
- * to some sort of system failure. If this is the case we need to notify the
- * other partitions to disengage from all references to our memory.
- * This function can also be called when our heartbeater could be offlined
- * for a time. In this case we need to notify other partitions to not worry
- * about the lack of a heartbeat.
- */
-static int
-xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused)
-{
- switch (event) {
- case DIE_MACHINE_RESTART:
- case DIE_MACHINE_HALT:
- xpc_die_disengage();
- break;
-
- case DIE_KDEBUG_ENTER:
- /* Should lack of heartbeat be ignored by other partitions? */
- if (!xpc_kdebug_ignore) {
- break;
- }
- /* fall through */
- case DIE_MCA_MONARCH_ENTER:
- case DIE_INIT_MONARCH_ENTER:
- xpc_vars->heartbeat++;
- xpc_vars->heartbeat_offline = 1;
- break;
-
- case DIE_KDEBUG_LEAVE:
- /* Is lack of heartbeat being ignored by other partitions? */
- if (!xpc_kdebug_ignore) {
- break;
- }
- /* fall through */
- case DIE_MCA_MONARCH_LEAVE:
- case DIE_INIT_MONARCH_LEAVE:
- xpc_vars->heartbeat++;
- xpc_vars->heartbeat_offline = 0;
- break;
- }
-
- return NOTIFY_DONE;
-}
-
-
-int __init
-xpc_init(void)
-{
- int ret;
- partid_t partid;
- struct xpc_partition *part;
- pid_t pid;
- size_t buf_size;
-
-
- if (!ia64_platform_is("sn2")) {
- return -ENODEV;
- }
-
-
- buf_size = max(XPC_RP_VARS_SIZE,
- XPC_RP_HEADER_SIZE + XP_NASID_MASK_BYTES);
- xpc_remote_copy_buffer = xpc_kmalloc_cacheline_aligned(buf_size,
- GFP_KERNEL, &xpc_remote_copy_buffer_base);
- if (xpc_remote_copy_buffer == NULL)
- return -ENOMEM;
-
- snprintf(xpc_part->bus_id, BUS_ID_SIZE, "part");
- snprintf(xpc_chan->bus_id, BUS_ID_SIZE, "chan");
-
- xpc_sysctl = register_sysctl_table(xpc_sys_dir);
-
- /*
- * The first few fields of each entry of xpc_partitions[] need to
- * be initialized now so that calls to xpc_connect() and
- * xpc_disconnect() can be made prior to the activation of any remote
- * partition. NOTE THAT NONE OF THE OTHER FIELDS BELONGING TO THESE
- * ENTRIES ARE MEANINGFUL UNTIL AFTER AN ENTRY'S CORRESPONDING
- * PARTITION HAS BEEN ACTIVATED.
- */
- for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
- part = &xpc_partitions[partid];
-
- DBUG_ON((u64) part != L1_CACHE_ALIGN((u64) part));
-
- part->act_IRQ_rcvd = 0;
- spin_lock_init(&part->act_lock);
- part->act_state = XPC_P_INACTIVE;
- XPC_SET_REASON(part, 0, 0);
-
- init_timer(&part->disengage_request_timer);
- part->disengage_request_timer.function =
- xpc_timeout_partition_disengage_request;
- part->disengage_request_timer.data = (unsigned long) part;
-
- part->setup_state = XPC_P_UNSET;
- init_waitqueue_head(&part->teardown_wq);
- atomic_set(&part->references, 0);
- }
-
- /*
- * Open up protections for IPI operations (and AMO operations on
- * Shub 1.1 systems).
- */
- xpc_allow_IPI_ops();
-
- /*
- * Interrupts being processed will increment this atomic variable and
- * awaken the heartbeat thread which will process the interrupts.
- */
- atomic_set(&xpc_act_IRQ_rcvd, 0);
-
- /*
- * This is safe to do before the xpc_hb_checker thread has started
- * because the handler releases a wait queue. If an interrupt is
- * received before the thread is waiting, it will not go to sleep,
- * but rather immediately process the interrupt.
- */
- ret = request_irq(SGI_XPC_ACTIVATE, xpc_act_IRQ_handler, 0,
- "xpc hb", NULL);
- if (ret != 0) {
- dev_err(xpc_part, "can't register ACTIVATE IRQ handler, "
- "errno=%d\n", -ret);
-
- xpc_restrict_IPI_ops();
-
- if (xpc_sysctl) {
- unregister_sysctl_table(xpc_sysctl);
- }
-
- kfree(xpc_remote_copy_buffer_base);
- return -EBUSY;
- }
-
- /*
- * Fill the partition reserved page with the information needed by
- * other partitions to discover we are alive and establish initial
- * communications.
- */
- xpc_rsvd_page = xpc_rsvd_page_init();
- if (xpc_rsvd_page == NULL) {
- dev_err(xpc_part, "could not setup our reserved page\n");
-
- free_irq(SGI_XPC_ACTIVATE, NULL);
- xpc_restrict_IPI_ops();
-
- if (xpc_sysctl) {
- unregister_sysctl_table(xpc_sysctl);
- }
-
- kfree(xpc_remote_copy_buffer_base);
- return -EBUSY;
- }
-
-
- /* add ourselves to the reboot_notifier_list */
- ret = register_reboot_notifier(&xpc_reboot_notifier);
- if (ret != 0) {
- dev_warn(xpc_part, "can't register reboot notifier\n");
- }
-
- /* add ourselves to the die_notifier list */
- ret = register_die_notifier(&xpc_die_notifier);
- if (ret != 0) {
- dev_warn(xpc_part, "can't register die notifier\n");
- }
-
- init_timer(&xpc_hb_timer);
- xpc_hb_timer.function = xpc_hb_beater;
-
- /*
- * The real work-horse behind xpc. This processes incoming
- * interrupts and monitors remote heartbeats.
- */
- pid = kernel_thread(xpc_hb_checker, NULL, 0);
- if (pid < 0) {
- dev_err(xpc_part, "failed while forking hb check thread\n");
-
- /* indicate to others that our reserved page is uninitialized */
- xpc_rsvd_page->vars_pa = 0;
-
- /* take ourselves off of the reboot_notifier_list */
- (void) unregister_reboot_notifier(&xpc_reboot_notifier);
-
- /* take ourselves off of the die_notifier list */
- (void) unregister_die_notifier(&xpc_die_notifier);
-
- del_timer_sync(&xpc_hb_timer);
- free_irq(SGI_XPC_ACTIVATE, NULL);
- xpc_restrict_IPI_ops();
-
- if (xpc_sysctl) {
- unregister_sysctl_table(xpc_sysctl);
- }
-
- kfree(xpc_remote_copy_buffer_base);
- return -EBUSY;
- }
-
-
- /*
- * Startup a thread that will attempt to discover other partitions to
- * activate based on info provided by SAL. This new thread is short
- * lived and will exit once discovery is complete.
- */
- pid = kernel_thread(xpc_initiate_discovery, NULL, 0);
- if (pid < 0) {
- dev_err(xpc_part, "failed while forking discovery thread\n");
-
- /* mark this new thread as a non-starter */
- complete(&xpc_discovery_exited);
-
- xpc_do_exit(xpcUnloading);
- return -EBUSY;
- }
-
-
- /* set the interface to point at XPC's functions */
- xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect,
- xpc_initiate_allocate, xpc_initiate_send,
- xpc_initiate_send_notify, xpc_initiate_received,
- xpc_initiate_partid_to_nasids);
-
- return 0;
-}
-module_init(xpc_init);
-
-
-void __exit
-xpc_exit(void)
-{
- xpc_do_exit(xpcUnloading);
-}
-module_exit(xpc_exit);
-
-
-MODULE_AUTHOR("Silicon Graphics, Inc.");
-MODULE_DESCRIPTION("Cross Partition Communication (XPC) support");
-MODULE_LICENSE("GPL");
-
-module_param(xpc_hb_interval, int, 0);
-MODULE_PARM_DESC(xpc_hb_interval, "Number of seconds between "
- "heartbeat increments.");
-
-module_param(xpc_hb_check_interval, int, 0);
-MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between "
- "heartbeat checks.");
-
-module_param(xpc_disengage_request_timelimit, int, 0);
-MODULE_PARM_DESC(xpc_disengage_request_timelimit, "Number of seconds to wait "
- "for disengage request to complete.");
-
-module_param(xpc_kdebug_ignore, int, 0);
-MODULE_PARM_DESC(xpc_kdebug_ignore, "Should lack of heartbeat be ignored by "
- "other partitions when dropping into kdebug.");
-
+++ /dev/null
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (c) 2004-2006 Silicon Graphics, Inc. All Rights Reserved.
- */
-
-
-/*
- * Cross Partition Communication (XPC) partition support.
- *
- * This is the part of XPC that detects the presence/absence of
- * other partitions. It provides a heartbeat and monitors the
- * heartbeats of other partitions.
- *
- */
-
-
-#include <linux/kernel.h>
-#include <linux/sysctl.h>
-#include <linux/cache.h>
-#include <linux/mmzone.h>
-#include <linux/nodemask.h>
-#include <asm/uncached.h>
-#include <asm/sn/bte.h>
-#include <asm/sn/intr.h>
-#include <asm/sn/sn_sal.h>
-#include <asm/sn/nodepda.h>
-#include <asm/sn/addrs.h>
-#include <asm/sn/xpc.h>
-
-
-/* XPC is exiting flag */
-int xpc_exiting;
-
-
-/* SH_IPI_ACCESS shub register value on startup */
-static u64 xpc_sh1_IPI_access;
-static u64 xpc_sh2_IPI_access0;
-static u64 xpc_sh2_IPI_access1;
-static u64 xpc_sh2_IPI_access2;
-static u64 xpc_sh2_IPI_access3;
-
-
-/* original protection values for each node */
-u64 xpc_prot_vec[MAX_NUMNODES];
-
-
-/* this partition's reserved page pointers */
-struct xpc_rsvd_page *xpc_rsvd_page;
-static u64 *xpc_part_nasids;
-static u64 *xpc_mach_nasids;
-struct xpc_vars *xpc_vars;
-struct xpc_vars_part *xpc_vars_part;
-
-static int xp_nasid_mask_bytes; /* actual size in bytes of nasid mask */
-static int xp_nasid_mask_words; /* actual size in words of nasid mask */
-
-
-/*
- * For performance reasons, each entry of xpc_partitions[] is cacheline
- * aligned. And xpc_partitions[] is padded with an additional entry at the
- * end so that the last legitimate entry doesn't share its cacheline with
- * another variable.
- */
-struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1];
-
-
-/*
- * Generic buffer used to store a local copy of portions of a remote
- * partition's reserved page (either its header and part_nasids mask,
- * or its vars).
- */
-char *xpc_remote_copy_buffer;
-void *xpc_remote_copy_buffer_base;
-
-
-/*
- * Guarantee that the kmalloc'd memory is cacheline aligned.
- */
-void *
-xpc_kmalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
-{
- /* see if kmalloc will give us cachline aligned memory by default */
- *base = kmalloc(size, flags);
- if (*base == NULL) {
- return NULL;
- }
- if ((u64) *base == L1_CACHE_ALIGN((u64) *base)) {
- return *base;
- }
- kfree(*base);
-
- /* nope, we'll have to do it ourselves */
- *base = kmalloc(size + L1_CACHE_BYTES, flags);
- if (*base == NULL) {
- return NULL;
- }
- return (void *) L1_CACHE_ALIGN((u64) *base);
-}
-
-
-/*
- * Given a nasid, get the physical address of the partition's reserved page
- * for that nasid. This function returns 0 on any error.
- */
-static u64
-xpc_get_rsvd_page_pa(int nasid)
-{
- bte_result_t bte_res;
- s64 status;
- u64 cookie = 0;
- u64 rp_pa = nasid; /* seed with nasid */
- u64 len = 0;
- u64 buf = buf;
- u64 buf_len = 0;
- void *buf_base = NULL;
-
-
- while (1) {
-
- status = sn_partition_reserved_page_pa(buf, &cookie, &rp_pa,
- &len);
-
- dev_dbg(xpc_part, "SAL returned with status=%li, cookie="
- "0x%016lx, address=0x%016lx, len=0x%016lx\n",
- status, cookie, rp_pa, len);
-
- if (status != SALRET_MORE_PASSES) {
- break;
- }
-
- if (L1_CACHE_ALIGN(len) > buf_len) {
- kfree(buf_base);
- buf_len = L1_CACHE_ALIGN(len);
- buf = (u64) xpc_kmalloc_cacheline_aligned(buf_len,
- GFP_KERNEL, &buf_base);
- if (buf_base == NULL) {
- dev_err(xpc_part, "unable to kmalloc "
- "len=0x%016lx\n", buf_len);
- status = SALRET_ERROR;
- break;
- }
- }
-
- bte_res = xp_bte_copy(rp_pa, buf, buf_len,
- (BTE_NOTIFY | BTE_WACQUIRE), NULL);
- if (bte_res != BTE_SUCCESS) {
- dev_dbg(xpc_part, "xp_bte_copy failed %i\n", bte_res);
- status = SALRET_ERROR;
- break;
- }
- }
-
- kfree(buf_base);
-
- if (status != SALRET_OK) {
- rp_pa = 0;
- }
- dev_dbg(xpc_part, "reserved page at phys address 0x%016lx\n", rp_pa);
- return rp_pa;
-}
-
-
-/*
- * Fill the partition reserved page with the information needed by
- * other partitions to discover we are alive and establish initial
- * communications.
- */
-struct xpc_rsvd_page *
-xpc_rsvd_page_init(void)
-{
- struct xpc_rsvd_page *rp;
- AMO_t *amos_page;
- u64 rp_pa, nasid_array = 0;
- int i, ret;
-
-
- /* get the local reserved page's address */
-
- preempt_disable();
- rp_pa = xpc_get_rsvd_page_pa(cpuid_to_nasid(smp_processor_id()));
- preempt_enable();
- if (rp_pa == 0) {
- dev_err(xpc_part, "SAL failed to locate the reserved page\n");
- return NULL;
- }
- rp = (struct xpc_rsvd_page *) __va(rp_pa);
-
- if (rp->partid != sn_partition_id) {
- dev_err(xpc_part, "the reserved page's partid of %d should be "
- "%d\n", rp->partid, sn_partition_id);
- return NULL;
- }
-
- rp->version = XPC_RP_VERSION;
-
- /* establish the actual sizes of the nasid masks */
- if (rp->SAL_version == 1) {
- /* SAL_version 1 didn't set the nasids_size field */
- rp->nasids_size = 128;
- }
- xp_nasid_mask_bytes = rp->nasids_size;
- xp_nasid_mask_words = xp_nasid_mask_bytes / 8;
-
- /* setup the pointers to the various items in the reserved page */
- xpc_part_nasids = XPC_RP_PART_NASIDS(rp);
- xpc_mach_nasids = XPC_RP_MACH_NASIDS(rp);
- xpc_vars = XPC_RP_VARS(rp);
- xpc_vars_part = XPC_RP_VARS_PART(rp);
-
- /*
- * Before clearing xpc_vars, see if a page of AMOs had been previously
- * allocated. If not we'll need to allocate one and set permissions
- * so that cross-partition AMOs are allowed.
- *
- * The allocated AMO page needs MCA reporting to remain disabled after
- * XPC has unloaded. To make this work, we keep a copy of the pointer
- * to this page (i.e., amos_page) in the struct xpc_vars structure,
- * which is pointed to by the reserved page, and re-use that saved copy
- * on subsequent loads of XPC. This AMO page is never freed, and its
- * memory protections are never restricted.
- */
- if ((amos_page = xpc_vars->amos_page) == NULL) {
- amos_page = (AMO_t *) TO_AMO(uncached_alloc_page(0));
- if (amos_page == NULL) {
- dev_err(xpc_part, "can't allocate page of AMOs\n");
- return NULL;
- }
-
- /*
- * Open up AMO-R/W to cpu. This is done for Shub 1.1 systems
- * when xpc_allow_IPI_ops() is called via xpc_hb_init().
- */
- if (!enable_shub_wars_1_1()) {
- ret = sn_change_memprotect(ia64_tpa((u64) amos_page),
- PAGE_SIZE, SN_MEMPROT_ACCESS_CLASS_1,
- &nasid_array);
- if (ret != 0) {
- dev_err(xpc_part, "can't change memory "
- "protections\n");
- uncached_free_page(__IA64_UNCACHED_OFFSET |
- TO_PHYS((u64) amos_page));
- return NULL;
- }
- }
- } else if (!IS_AMO_ADDRESS((u64) amos_page)) {
- /*
- * EFI's XPBOOT can also set amos_page in the reserved page,
- * but it happens to leave it as an uncached physical address
- * and we need it to be an uncached virtual, so we'll have to
- * convert it.
- */
- if (!IS_AMO_PHYS_ADDRESS((u64) amos_page)) {
- dev_err(xpc_part, "previously used amos_page address "
- "is bad = 0x%p\n", (void *) amos_page);
- return NULL;
- }
- amos_page = (AMO_t *) TO_AMO((u64) amos_page);
- }
-
- /* clear xpc_vars */
- memset(xpc_vars, 0, sizeof(struct xpc_vars));
-
- xpc_vars->version = XPC_V_VERSION;
- xpc_vars->act_nasid = cpuid_to_nasid(0);
- xpc_vars->act_phys_cpuid = cpu_physical_id(0);
- xpc_vars->vars_part_pa = __pa(xpc_vars_part);
- xpc_vars->amos_page_pa = ia64_tpa((u64) amos_page);
- xpc_vars->amos_page = amos_page; /* save for next load of XPC */
-
-
- /* clear xpc_vars_part */
- memset((u64 *) xpc_vars_part, 0, sizeof(struct xpc_vars_part) *
- XP_MAX_PARTITIONS);
-
- /* initialize the activate IRQ related AMO variables */
- for (i = 0; i < xp_nasid_mask_words; i++) {
- (void) xpc_IPI_init(XPC_ACTIVATE_IRQ_AMOS + i);
- }
-
- /* initialize the engaged remote partitions related AMO variables */
- (void) xpc_IPI_init(XPC_ENGAGED_PARTITIONS_AMO);
- (void) xpc_IPI_init(XPC_DISENGAGE_REQUEST_AMO);
-
- /* timestamp of when reserved page was setup by XPC */
- rp->stamp = CURRENT_TIME;
-
- /*
- * This signifies to the remote partition that our reserved
- * page is initialized.
- */
- rp->vars_pa = __pa(xpc_vars);
-
- return rp;
-}
-
-
-/*
- * Change protections to allow IPI operations (and AMO operations on
- * Shub 1.1 systems).
- */
-void
-xpc_allow_IPI_ops(void)
-{
- int node;
- int nasid;
-
-
- // >>> Change SH_IPI_ACCESS code to use SAL call once it is available.
-
- if (is_shub2()) {
- xpc_sh2_IPI_access0 =
- (u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS0));
- xpc_sh2_IPI_access1 =
- (u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS1));
- xpc_sh2_IPI_access2 =
- (u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS2));
- xpc_sh2_IPI_access3 =
- (u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS3));
-
- for_each_online_node(node) {
- nasid = cnodeid_to_nasid(node);
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
- -1UL);
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
- -1UL);
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
- -1UL);
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
- -1UL);
- }
-
- } else {
- xpc_sh1_IPI_access =
- (u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH1_IPI_ACCESS));
-
- for_each_online_node(node) {
- nasid = cnodeid_to_nasid(node);
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
- -1UL);
-
- /*
- * Since the BIST collides with memory operations on
- * SHUB 1.1 sn_change_memprotect() cannot be used.
- */
- if (enable_shub_wars_1_1()) {
- /* open up everything */
- xpc_prot_vec[node] = (u64) HUB_L((u64 *)
- GLOBAL_MMR_ADDR(nasid,
- SH1_MD_DQLP_MMR_DIR_PRIVEC0));
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
- SH1_MD_DQLP_MMR_DIR_PRIVEC0),
- -1UL);
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
- SH1_MD_DQRP_MMR_DIR_PRIVEC0),
- -1UL);
- }
- }
- }
-}
-
-
-/*
- * Restrict protections to disallow IPI operations (and AMO operations on
- * Shub 1.1 systems).
- */
-void
-xpc_restrict_IPI_ops(void)
-{
- int node;
- int nasid;
-
-
- // >>> Change SH_IPI_ACCESS code to use SAL call once it is available.
-
- if (is_shub2()) {
-
- for_each_online_node(node) {
- nasid = cnodeid_to_nasid(node);
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
- xpc_sh2_IPI_access0);
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
- xpc_sh2_IPI_access1);
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
- xpc_sh2_IPI_access2);
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
- xpc_sh2_IPI_access3);
- }
-
- } else {
-
- for_each_online_node(node) {
- nasid = cnodeid_to_nasid(node);
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
- xpc_sh1_IPI_access);
-
- if (enable_shub_wars_1_1()) {
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
- SH1_MD_DQLP_MMR_DIR_PRIVEC0),
- xpc_prot_vec[node]);
- HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
- SH1_MD_DQRP_MMR_DIR_PRIVEC0),
- xpc_prot_vec[node]);
- }
- }
- }
-}
-
-
-/*
- * At periodic intervals, scan through all active partitions and ensure
- * their heartbeat is still active. If not, the partition is deactivated.
- */
-void
-xpc_check_remote_hb(void)
-{
- struct xpc_vars *remote_vars;
- struct xpc_partition *part;
- partid_t partid;
- bte_result_t bres;
-
-
- remote_vars = (struct xpc_vars *) xpc_remote_copy_buffer;
-
- for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
-
- if (xpc_exiting) {
- break;
- }
-
- if (partid == sn_partition_id) {
- continue;
- }
-
- part = &xpc_partitions[partid];
-
- if (part->act_state == XPC_P_INACTIVE ||
- part->act_state == XPC_P_DEACTIVATING) {
- continue;
- }
-
- /* pull the remote_hb cache line */
- bres = xp_bte_copy(part->remote_vars_pa,
- (u64) remote_vars,
- XPC_RP_VARS_SIZE,
- (BTE_NOTIFY | BTE_WACQUIRE), NULL);
- if (bres != BTE_SUCCESS) {
- XPC_DEACTIVATE_PARTITION(part,
- xpc_map_bte_errors(bres));
- continue;
- }
-
- dev_dbg(xpc_part, "partid = %d, heartbeat = %ld, last_heartbeat"
- " = %ld, heartbeat_offline = %ld, HB_mask = 0x%lx\n",
- partid, remote_vars->heartbeat, part->last_heartbeat,
- remote_vars->heartbeat_offline,
- remote_vars->heartbeating_to_mask);
-
- if (((remote_vars->heartbeat == part->last_heartbeat) &&
- (remote_vars->heartbeat_offline == 0)) ||
- !xpc_hb_allowed(sn_partition_id, remote_vars)) {
-
- XPC_DEACTIVATE_PARTITION(part, xpcNoHeartbeat);
- continue;
- }
-
- part->last_heartbeat = remote_vars->heartbeat;
- }
-}
-
-
-/*
- * Get a copy of a portion of the remote partition's rsvd page.
- *
- * remote_rp points to a buffer that is cacheline aligned for BTE copies and
- * is large enough to contain a copy of their reserved page header and
- * part_nasids mask.
- */
-static enum xpc_retval
-xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
- struct xpc_rsvd_page *remote_rp, u64 *remote_rp_pa)
-{
- int bres, i;
-
-
- /* get the reserved page's physical address */
-
- *remote_rp_pa = xpc_get_rsvd_page_pa(nasid);
- if (*remote_rp_pa == 0) {
- return xpcNoRsvdPageAddr;
- }
-
-
- /* pull over the reserved page header and part_nasids mask */
- bres = xp_bte_copy(*remote_rp_pa, (u64) remote_rp,
- XPC_RP_HEADER_SIZE + xp_nasid_mask_bytes,
- (BTE_NOTIFY | BTE_WACQUIRE), NULL);
- if (bres != BTE_SUCCESS) {
- return xpc_map_bte_errors(bres);
- }
-
-
- if (discovered_nasids != NULL) {
- u64 *remote_part_nasids = XPC_RP_PART_NASIDS(remote_rp);
-
-
- for (i = 0; i < xp_nasid_mask_words; i++) {
- discovered_nasids[i] |= remote_part_nasids[i];
- }
- }
-
-
- /* check that the partid is for another partition */
-
- if (remote_rp->partid < 1 ||
- remote_rp->partid > (XP_MAX_PARTITIONS - 1)) {
- return xpcInvalidPartid;
- }
-
- if (remote_rp->partid == sn_partition_id) {
- return xpcLocalPartid;
- }
-
-
- if (XPC_VERSION_MAJOR(remote_rp->version) !=
- XPC_VERSION_MAJOR(XPC_RP_VERSION)) {
- return xpcBadVersion;
- }
-
- return xpcSuccess;
-}
-
-
-/*
- * Get a copy of the remote partition's XPC variables from the reserved page.
- *
- * remote_vars points to a buffer that is cacheline aligned for BTE copies and
- * assumed to be of size XPC_RP_VARS_SIZE.
- */
-static enum xpc_retval
-xpc_get_remote_vars(u64 remote_vars_pa, struct xpc_vars *remote_vars)
-{
- int bres;
-
-
- if (remote_vars_pa == 0) {
- return xpcVarsNotSet;
- }
-
- /* pull over the cross partition variables */
- bres = xp_bte_copy(remote_vars_pa, (u64) remote_vars, XPC_RP_VARS_SIZE,
- (BTE_NOTIFY | BTE_WACQUIRE), NULL);
- if (bres != BTE_SUCCESS) {
- return xpc_map_bte_errors(bres);
- }
-
- if (XPC_VERSION_MAJOR(remote_vars->version) !=
- XPC_VERSION_MAJOR(XPC_V_VERSION)) {
- return xpcBadVersion;
- }
-
- return xpcSuccess;
-}
-
-
-/*
- * Update the remote partition's info.
- */
-static void
-xpc_update_partition_info(struct xpc_partition *part, u8 remote_rp_version,
- struct timespec *remote_rp_stamp, u64 remote_rp_pa,
- u64 remote_vars_pa, struct xpc_vars *remote_vars)
-{
- part->remote_rp_version = remote_rp_version;
- dev_dbg(xpc_part, " remote_rp_version = 0x%016x\n",
- part->remote_rp_version);
-
- part->remote_rp_stamp = *remote_rp_stamp;
- dev_dbg(xpc_part, " remote_rp_stamp (tv_sec = 0x%lx tv_nsec = 0x%lx\n",
- part->remote_rp_stamp.tv_sec, part->remote_rp_stamp.tv_nsec);
-
- part->remote_rp_pa = remote_rp_pa;
- dev_dbg(xpc_part, " remote_rp_pa = 0x%016lx\n", part->remote_rp_pa);
-
- part->remote_vars_pa = remote_vars_pa;
- dev_dbg(xpc_part, " remote_vars_pa = 0x%016lx\n",
- part->remote_vars_pa);
-
- part->last_heartbeat = remote_vars->heartbeat;
- dev_dbg(xpc_part, " last_heartbeat = 0x%016lx\n",
- part->last_heartbeat);
-
- part->remote_vars_part_pa = remote_vars->vars_part_pa;
- dev_dbg(xpc_part, " remote_vars_part_pa = 0x%016lx\n",
- part->remote_vars_part_pa);
-
- part->remote_act_nasid = remote_vars->act_nasid;
- dev_dbg(xpc_part, " remote_act_nasid = 0x%x\n",
- part->remote_act_nasid);
-
- part->remote_act_phys_cpuid = remote_vars->act_phys_cpuid;
- dev_dbg(xpc_part, " remote_act_phys_cpuid = 0x%x\n",
- part->remote_act_phys_cpuid);
-
- part->remote_amos_page_pa = remote_vars->amos_page_pa;
- dev_dbg(xpc_part, " remote_amos_page_pa = 0x%lx\n",
- part->remote_amos_page_pa);
-
- part->remote_vars_version = remote_vars->version;
- dev_dbg(xpc_part, " remote_vars_version = 0x%x\n",
- part->remote_vars_version);
-}
-
-
-/*
- * Prior code has determined the nasid which generated an IPI. Inspect
- * that nasid to determine if its partition needs to be activated or
- * deactivated.
- *
- * A partition is consider "awaiting activation" if our partition
- * flags indicate it is not active and it has a heartbeat. A
- * partition is considered "awaiting deactivation" if our partition
- * flags indicate it is active but it has no heartbeat or it is not
- * sending its heartbeat to us.
- *
- * To determine the heartbeat, the remote nasid must have a properly
- * initialized reserved page.
- */
-static void
-xpc_identify_act_IRQ_req(int nasid)
-{
- struct xpc_rsvd_page *remote_rp;
- struct xpc_vars *remote_vars;
- u64 remote_rp_pa;
- u64 remote_vars_pa;
- int remote_rp_version;
- int reactivate = 0;
- int stamp_diff;
- struct timespec remote_rp_stamp = { 0, 0 };
- partid_t partid;
- struct xpc_partition *part;
- enum xpc_retval ret;
-
-
- /* pull over the reserved page structure */
-
- remote_rp = (struct xpc_rsvd_page *) xpc_remote_copy_buffer;
-
- ret = xpc_get_remote_rp(nasid, NULL, remote_rp, &remote_rp_pa);
- if (ret != xpcSuccess) {
- dev_warn(xpc_part, "unable to get reserved page from nasid %d, "
- "which sent interrupt, reason=%d\n", nasid, ret);
- return;
- }
-
- remote_vars_pa = remote_rp->vars_pa;
- remote_rp_version = remote_rp->version;
- if (XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
- remote_rp_stamp = remote_rp->stamp;
- }
- partid = remote_rp->partid;
- part = &xpc_partitions[partid];
-
-
- /* pull over the cross partition variables */
-
- remote_vars = (struct xpc_vars *) xpc_remote_copy_buffer;
-
- ret = xpc_get_remote_vars(remote_vars_pa, remote_vars);
- if (ret != xpcSuccess) {
-
- dev_warn(xpc_part, "unable to get XPC variables from nasid %d, "
- "which sent interrupt, reason=%d\n", nasid, ret);
-
- XPC_DEACTIVATE_PARTITION(part, ret);
- return;
- }
-
-
- part->act_IRQ_rcvd++;
-
- dev_dbg(xpc_part, "partid for nasid %d is %d; IRQs = %d; HB = "
- "%ld:0x%lx\n", (int) nasid, (int) partid, part->act_IRQ_rcvd,
- remote_vars->heartbeat, remote_vars->heartbeating_to_mask);
-
- if (xpc_partition_disengaged(part) &&
- part->act_state == XPC_P_INACTIVE) {
-
- xpc_update_partition_info(part, remote_rp_version,
- &remote_rp_stamp, remote_rp_pa,
- remote_vars_pa, remote_vars);
-
- if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
- if (xpc_partition_disengage_requested(1UL << partid)) {
- /*
- * Other side is waiting on us to disengage,
- * even though we already have.
- */
- return;
- }
- } else {
- /* other side doesn't support disengage requests */
- xpc_clear_partition_disengage_request(1UL << partid);
- }
-
- xpc_activate_partition(part);
- return;
- }
-
- DBUG_ON(part->remote_rp_version == 0);
- DBUG_ON(part->remote_vars_version == 0);
-
- if (!XPC_SUPPORTS_RP_STAMP(part->remote_rp_version)) {
- DBUG_ON(XPC_SUPPORTS_DISENGAGE_REQUEST(part->
- remote_vars_version));
-
- if (!XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
- DBUG_ON(XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->
- version));
- /* see if the other side rebooted */
- if (part->remote_amos_page_pa ==
- remote_vars->amos_page_pa &&
- xpc_hb_allowed(sn_partition_id,
- remote_vars)) {
- /* doesn't look that way, so ignore the IPI */
- return;
- }
- }
-
- /*
- * Other side rebooted and previous XPC didn't support the
- * disengage request, so we don't need to do anything special.
- */
-
- xpc_update_partition_info(part, remote_rp_version,
- &remote_rp_stamp, remote_rp_pa,
- remote_vars_pa, remote_vars);
- part->reactivate_nasid = nasid;
- XPC_DEACTIVATE_PARTITION(part, xpcReactivating);
- return;
- }
-
- DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version));
-
- if (!XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
- DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->version));
-
- /*
- * Other side rebooted and previous XPC did support the
- * disengage request, but the new one doesn't.
- */
-
- xpc_clear_partition_engaged(1UL << partid);
- xpc_clear_partition_disengage_request(1UL << partid);
-
- xpc_update_partition_info(part, remote_rp_version,
- &remote_rp_stamp, remote_rp_pa,
- remote_vars_pa, remote_vars);
- reactivate = 1;
-
- } else {
- DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->version));
-
- stamp_diff = xpc_compare_stamps(&part->remote_rp_stamp,
- &remote_rp_stamp);
- if (stamp_diff != 0) {
- DBUG_ON(stamp_diff >= 0);
-
- /*
- * Other side rebooted and the previous XPC did support
- * the disengage request, as does the new one.
- */
-
- DBUG_ON(xpc_partition_engaged(1UL << partid));
- DBUG_ON(xpc_partition_disengage_requested(1UL <<
- partid));
-
- xpc_update_partition_info(part, remote_rp_version,
- &remote_rp_stamp, remote_rp_pa,
- remote_vars_pa, remote_vars);
- reactivate = 1;
- }
- }
-
- if (part->disengage_request_timeout > 0 &&
- !xpc_partition_disengaged(part)) {
- /* still waiting on other side to disengage from us */
- return;
- }
-
- if (reactivate) {
- part->reactivate_nasid = nasid;
- XPC_DEACTIVATE_PARTITION(part, xpcReactivating);
-
- } else if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version) &&
- xpc_partition_disengage_requested(1UL << partid)) {
- XPC_DEACTIVATE_PARTITION(part, xpcOtherGoingDown);
- }
-}
-
-
-/*
- * Loop through the activation AMO variables and process any bits
- * which are set. Each bit indicates a nasid sending a partition
- * activation or deactivation request.
- *
- * Return #of IRQs detected.
- */
-int
-xpc_identify_act_IRQ_sender(void)
-{
- int word, bit;
- u64 nasid_mask;
- u64 nasid; /* remote nasid */
- int n_IRQs_detected = 0;
- AMO_t *act_amos;
-
-
- act_amos = xpc_vars->amos_page + XPC_ACTIVATE_IRQ_AMOS;
-
-
- /* scan through act AMO variable looking for non-zero entries */
- for (word = 0; word < xp_nasid_mask_words; word++) {
-
- if (xpc_exiting) {
- break;
- }
-
- nasid_mask = xpc_IPI_receive(&act_amos[word]);
- if (nasid_mask == 0) {
- /* no IRQs from nasids in this variable */
- continue;
- }
-
- dev_dbg(xpc_part, "AMO[%d] gave back 0x%lx\n", word,
- nasid_mask);
-
-
- /*
- * If this nasid has been added to the machine since
- * our partition was reset, this will retain the
- * remote nasid in our reserved pages machine mask.
- * This is used in the event of module reload.
- */
- xpc_mach_nasids[word] |= nasid_mask;
-
-
- /* locate the nasid(s) which sent interrupts */
-
- for (bit = 0; bit < (8 * sizeof(u64)); bit++) {
- if (nasid_mask & (1UL << bit)) {
- n_IRQs_detected++;
- nasid = XPC_NASID_FROM_W_B(word, bit);
- dev_dbg(xpc_part, "interrupt from nasid %ld\n",
- nasid);
- xpc_identify_act_IRQ_req(nasid);
- }
- }
- }
- return n_IRQs_detected;
-}
-
-
-/*
- * See if the other side has responded to a partition disengage request
- * from us.
- */
-int
-xpc_partition_disengaged(struct xpc_partition *part)
-{
- partid_t partid = XPC_PARTID(part);
- int disengaged;
-
-
- disengaged = (xpc_partition_engaged(1UL << partid) == 0);
- if (part->disengage_request_timeout) {
- if (!disengaged) {
- if (time_before(jiffies, part->disengage_request_timeout)) {
- /* timelimit hasn't been reached yet */
- return 0;
- }
-
- /*
- * Other side hasn't responded to our disengage
- * request in a timely fashion, so assume it's dead.
- */
-
- dev_info(xpc_part, "disengage from remote partition %d "
- "timed out\n", partid);
- xpc_disengage_request_timedout = 1;
- xpc_clear_partition_engaged(1UL << partid);
- disengaged = 1;
- }
- part->disengage_request_timeout = 0;
-
- /* cancel the timer function, provided it's not us */
- if (!in_interrupt()) {
- del_singleshot_timer_sync(&part->
- disengage_request_timer);
- }
-
- DBUG_ON(part->act_state != XPC_P_DEACTIVATING &&
- part->act_state != XPC_P_INACTIVE);
- if (part->act_state != XPC_P_INACTIVE) {
- xpc_wakeup_channel_mgr(part);
- }
-
- if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
- xpc_cancel_partition_disengage_request(part);
- }
- }
- return disengaged;
-}
-
-
-/*
- * Mark specified partition as active.
- */
-enum xpc_retval
-xpc_mark_partition_active(struct xpc_partition *part)
-{
- unsigned long irq_flags;
- enum xpc_retval ret;
-
-
- dev_dbg(xpc_part, "setting partition %d to ACTIVE\n", XPC_PARTID(part));
-
- spin_lock_irqsave(&part->act_lock, irq_flags);
- if (part->act_state == XPC_P_ACTIVATING) {
- part->act_state = XPC_P_ACTIVE;
- ret = xpcSuccess;
- } else {
- DBUG_ON(part->reason == xpcSuccess);
- ret = part->reason;
- }
- spin_unlock_irqrestore(&part->act_lock, irq_flags);
-
- return ret;
-}
-
-
-/*
- * Notify XPC that the partition is down.
- */
-void
-xpc_deactivate_partition(const int line, struct xpc_partition *part,
- enum xpc_retval reason)
-{
- unsigned long irq_flags;
-
-
- spin_lock_irqsave(&part->act_lock, irq_flags);
-
- if (part->act_state == XPC_P_INACTIVE) {
- XPC_SET_REASON(part, reason, line);
- spin_unlock_irqrestore(&part->act_lock, irq_flags);
- if (reason == xpcReactivating) {
- /* we interrupt ourselves to reactivate partition */
- xpc_IPI_send_reactivate(part);
- }
- return;
- }
- if (part->act_state == XPC_P_DEACTIVATING) {
- if ((part->reason == xpcUnloading && reason != xpcUnloading) ||
- reason == xpcReactivating) {
- XPC_SET_REASON(part, reason, line);
- }
- spin_unlock_irqrestore(&part->act_lock, irq_flags);
- return;
- }
-
- part->act_state = XPC_P_DEACTIVATING;
- XPC_SET_REASON(part, reason, line);
-
- spin_unlock_irqrestore(&part->act_lock, irq_flags);
-
- if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
- xpc_request_partition_disengage(part);
- xpc_IPI_send_disengage(part);
-
- /* set a timelimit on the disengage request */
- part->disengage_request_timeout = jiffies +
- (xpc_disengage_request_timelimit * HZ);
- part->disengage_request_timer.expires =
- part->disengage_request_timeout;
- add_timer(&part->disengage_request_timer);
- }
-
- dev_dbg(xpc_part, "bringing partition %d down, reason = %d\n",
- XPC_PARTID(part), reason);
-
- xpc_partition_going_down(part, reason);
-}
-
-
-/*
- * Mark specified partition as inactive.
- */
-void
-xpc_mark_partition_inactive(struct xpc_partition *part)
-{
- unsigned long irq_flags;
-
-
- dev_dbg(xpc_part, "setting partition %d to INACTIVE\n",
- XPC_PARTID(part));
-
- spin_lock_irqsave(&part->act_lock, irq_flags);
- part->act_state = XPC_P_INACTIVE;
- spin_unlock_irqrestore(&part->act_lock, irq_flags);
- part->remote_rp_pa = 0;
-}
-
-
-/*
- * SAL has provided a partition and machine mask. The partition mask
- * contains a bit for each even nasid in our partition. The machine
- * mask contains a bit for each even nasid in the entire machine.
- *
- * Using those two bit arrays, we can determine which nasids are
- * known in the machine. Each should also have a reserved page
- * initialized if they are available for partitioning.
- */
-void
-xpc_discovery(void)
-{
- void *remote_rp_base;
- struct xpc_rsvd_page *remote_rp;
- struct xpc_vars *remote_vars;
- u64 remote_rp_pa;
- u64 remote_vars_pa;
- int region;
- int region_size;
- int max_regions;
- int nasid;
- struct xpc_rsvd_page *rp;
- partid_t partid;
- struct xpc_partition *part;
- u64 *discovered_nasids;
- enum xpc_retval ret;
-
-
- remote_rp = xpc_kmalloc_cacheline_aligned(XPC_RP_HEADER_SIZE +
- xp_nasid_mask_bytes,
- GFP_KERNEL, &remote_rp_base);
- if (remote_rp == NULL) {
- return;
- }
- remote_vars = (struct xpc_vars *) remote_rp;
-
-
- discovered_nasids = kzalloc(sizeof(u64) * xp_nasid_mask_words,
- GFP_KERNEL);
- if (discovered_nasids == NULL) {
- kfree(remote_rp_base);
- return;
- }
-
- rp = (struct xpc_rsvd_page *) xpc_rsvd_page;
-
- /*
- * The term 'region' in this context refers to the minimum number of
- * nodes that can comprise an access protection grouping. The access
- * protection is in regards to memory, IOI and IPI.
- */
- max_regions = 64;
- region_size = sn_region_size;
-
- switch (region_size) {
- case 128:
- max_regions *= 2;
- case 64:
- max_regions *= 2;
- case 32:
- max_regions *= 2;
- region_size = 16;
- DBUG_ON(!is_shub2());
- }
-
- for (region = 0; region < max_regions; region++) {
-
- if ((volatile int) xpc_exiting) {
- break;
- }
-
- dev_dbg(xpc_part, "searching region %d\n", region);
-
- for (nasid = (region * region_size * 2);
- nasid < ((region + 1) * region_size * 2);
- nasid += 2) {
-
- if ((volatile int) xpc_exiting) {
- break;
- }
-
- dev_dbg(xpc_part, "checking nasid %d\n", nasid);
-
-
- if (XPC_NASID_IN_ARRAY(nasid, xpc_part_nasids)) {
- dev_dbg(xpc_part, "PROM indicates Nasid %d is "
- "part of the local partition; skipping "
- "region\n", nasid);
- break;
- }
-
- if (!(XPC_NASID_IN_ARRAY(nasid, xpc_mach_nasids))) {
- dev_dbg(xpc_part, "PROM indicates Nasid %d was "
- "not on Numa-Link network at reset\n",
- nasid);
- continue;
- }
-
- if (XPC_NASID_IN_ARRAY(nasid, discovered_nasids)) {
- dev_dbg(xpc_part, "Nasid %d is part of a "
- "partition which was previously "
- "discovered\n", nasid);
- continue;
- }
-
-
- /* pull over the reserved page structure */
-
- ret = xpc_get_remote_rp(nasid, discovered_nasids,
- remote_rp, &remote_rp_pa);
- if (ret != xpcSuccess) {
- dev_dbg(xpc_part, "unable to get reserved page "
- "from nasid %d, reason=%d\n", nasid,
- ret);
-
- if (ret == xpcLocalPartid) {
- break;
- }
- continue;
- }
-
- remote_vars_pa = remote_rp->vars_pa;
-
- partid = remote_rp->partid;
- part = &xpc_partitions[partid];
-
-
- /* pull over the cross partition variables */
-
- ret = xpc_get_remote_vars(remote_vars_pa, remote_vars);
- if (ret != xpcSuccess) {
- dev_dbg(xpc_part, "unable to get XPC variables "
- "from nasid %d, reason=%d\n", nasid,
- ret);
-
- XPC_DEACTIVATE_PARTITION(part, ret);
- continue;
- }
-
- if (part->act_state != XPC_P_INACTIVE) {
- dev_dbg(xpc_part, "partition %d on nasid %d is "
- "already activating\n", partid, nasid);
- break;
- }
-
- /*
- * Register the remote partition's AMOs with SAL so it
- * can handle and cleanup errors within that address
- * range should the remote partition go down. We don't
- * unregister this range because it is difficult to
- * tell when outstanding writes to the remote partition
- * are finished and thus when it is thus safe to
- * unregister. This should not result in wasted space
- * in the SAL xp_addr_region table because we should
- * get the same page for remote_act_amos_pa after
- * module reloads and system reboots.
- */
- if (sn_register_xp_addr_region(
- remote_vars->amos_page_pa,
- PAGE_SIZE, 1) < 0) {
- dev_dbg(xpc_part, "partition %d failed to "
- "register xp_addr region 0x%016lx\n",
- partid, remote_vars->amos_page_pa);
-
- XPC_SET_REASON(part, xpcPhysAddrRegFailed,
- __LINE__);
- break;
- }
-
- /*
- * The remote nasid is valid and available.
- * Send an interrupt to that nasid to notify
- * it that we are ready to begin activation.
- */
- dev_dbg(xpc_part, "sending an interrupt to AMO 0x%lx, "
- "nasid %d, phys_cpuid 0x%x\n",
- remote_vars->amos_page_pa,
- remote_vars->act_nasid,
- remote_vars->act_phys_cpuid);
-
- if (XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->
- version)) {
- part->remote_amos_page_pa =
- remote_vars->amos_page_pa;
- xpc_mark_partition_disengaged(part);
- xpc_cancel_partition_disengage_request(part);
- }
- xpc_IPI_send_activate(remote_vars);
- }
- }
-
- kfree(discovered_nasids);
- kfree(remote_rp_base);
-}
-
-
-/*
- * Given a partid, get the nasids owned by that partition from the
- * remote partition's reserved page.
- */
-enum xpc_retval
-xpc_initiate_partid_to_nasids(partid_t partid, void *nasid_mask)
-{
- struct xpc_partition *part;
- u64 part_nasid_pa;
- int bte_res;
-
-
- part = &xpc_partitions[partid];
- if (part->remote_rp_pa == 0) {
- return xpcPartitionDown;
- }
-
- memset(nasid_mask, 0, XP_NASID_MASK_BYTES);
-
- part_nasid_pa = (u64) XPC_RP_PART_NASIDS(part->remote_rp_pa);
-
- bte_res = xp_bte_copy(part_nasid_pa, (u64) nasid_mask,
- xp_nasid_mask_bytes, (BTE_NOTIFY | BTE_WACQUIRE), NULL);
-
- return xpc_map_bte_errors(bte_res);
-}
-
+++ /dev/null
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1999,2001-2005 Silicon Graphics, Inc. All rights reserved.
- */
-
-
-/*
- * Cross Partition Network Interface (XPNET) support
- *
- * XPNET provides a virtual network layered on top of the Cross
- * Partition communication layer.
- *
- * XPNET provides direct point-to-point and broadcast-like support
- * for an ethernet-like device. The ethernet broadcast medium is
- * replaced with a point-to-point message structure which passes
- * pointers to a DMA-capable block that a remote partition should
- * retrieve and pass to the upper level networking layer.
- *
- */
-
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/ioport.h>
-#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/delay.h>
-#include <linux/ethtool.h>
-#include <linux/mii.h>
-#include <linux/smp.h>
-#include <linux/string.h>
-#include <asm/sn/bte.h>
-#include <asm/sn/io.h>
-#include <asm/sn/sn_sal.h>
-#include <asm/types.h>
-#include <asm/atomic.h>
-#include <asm/sn/xp.h>
-
-
-/*
- * The message payload transferred by XPC.
- *
- * buf_pa is the physical address where the DMA should pull from.
- *
- * NOTE: for performance reasons, buf_pa should _ALWAYS_ begin on a
- * cacheline boundary. To accomplish this, we record the number of
- * bytes from the beginning of the first cacheline to the first useful
- * byte of the skb (leadin_ignore) and the number of bytes from the
- * last useful byte of the skb to the end of the last cacheline
- * (tailout_ignore).
- *
- * size is the number of bytes to transfer which includes the skb->len
- * (useful bytes of the senders skb) plus the leadin and tailout
- */
-struct xpnet_message {
- u16 version; /* Version for this message */
- u16 embedded_bytes; /* #of bytes embedded in XPC message */
- u32 magic; /* Special number indicating this is xpnet */
- u64 buf_pa; /* phys address of buffer to retrieve */
- u32 size; /* #of bytes in buffer */
- u8 leadin_ignore; /* #of bytes to ignore at the beginning */
- u8 tailout_ignore; /* #of bytes to ignore at the end */
- unsigned char data; /* body of small packets */
-};
-
-/*
- * Determine the size of our message, the cacheline aligned size,
- * and then the number of message will request from XPC.
- *
- * XPC expects each message to exist in an individual cacheline.
- */
-#define XPNET_MSG_SIZE (L1_CACHE_BYTES - XPC_MSG_PAYLOAD_OFFSET)
-#define XPNET_MSG_DATA_MAX \
- (XPNET_MSG_SIZE - (u64)(&((struct xpnet_message *)0)->data))
-#define XPNET_MSG_ALIGNED_SIZE (L1_CACHE_ALIGN(XPNET_MSG_SIZE))
-#define XPNET_MSG_NENTRIES (PAGE_SIZE / XPNET_MSG_ALIGNED_SIZE)
-
-
-#define XPNET_MAX_KTHREADS (XPNET_MSG_NENTRIES + 1)
-#define XPNET_MAX_IDLE_KTHREADS (XPNET_MSG_NENTRIES + 1)
-
-/*
- * Version number of XPNET implementation. XPNET can always talk to versions
- * with same major #, and never talk to versions with a different version.
- */
-#define _XPNET_VERSION(_major, _minor) (((_major) << 4) | (_minor))
-#define XPNET_VERSION_MAJOR(_v) ((_v) >> 4)
-#define XPNET_VERSION_MINOR(_v) ((_v) & 0xf)
-
-#define XPNET_VERSION _XPNET_VERSION(1,0) /* version 1.0 */
-#define XPNET_VERSION_EMBED _XPNET_VERSION(1,1) /* version 1.1 */
-#define XPNET_MAGIC 0x88786984 /* "XNET" */
-
-#define XPNET_VALID_MSG(_m) \
- ((XPNET_VERSION_MAJOR(_m->version) == XPNET_VERSION_MAJOR(XPNET_VERSION)) \
- && (msg->magic == XPNET_MAGIC))
-
-#define XPNET_DEVICE_NAME "xp0"
-
-
-/*
- * When messages are queued with xpc_send_notify, a kmalloc'd buffer
- * of the following type is passed as a notification cookie. When the
- * notification function is called, we use the cookie to decide
- * whether all outstanding message sends have completed. The skb can
- * then be released.
- */
-struct xpnet_pending_msg {
- struct list_head free_list;
- struct sk_buff *skb;
- atomic_t use_count;
-};
-
-/* driver specific structure pointed to by the device structure */
-struct xpnet_dev_private {
- struct net_device_stats stats;
-};
-
-struct net_device *xpnet_device;
-
-/*
- * When we are notified of other partitions activating, we add them to
- * our bitmask of partitions to which we broadcast.
- */
-static u64 xpnet_broadcast_partitions;
-/* protect above */
-static DEFINE_SPINLOCK(xpnet_broadcast_lock);
-
-/*
- * Since the Block Transfer Engine (BTE) is being used for the transfer
- * and it relies upon cache-line size transfers, we need to reserve at
- * least one cache-line for head and tail alignment. The BTE is
- * limited to 8MB transfers.
- *
- * Testing has shown that changing MTU to greater than 64KB has no effect
- * on TCP as the two sides negotiate a Max Segment Size that is limited
- * to 64K. Other protocols May use packets greater than this, but for
- * now, the default is 64KB.
- */
-#define XPNET_MAX_MTU (0x800000UL - L1_CACHE_BYTES)
-/* 32KB has been determined to be the ideal */
-#define XPNET_DEF_MTU (0x8000UL)
-
-
-/*
- * The partition id is encapsulated in the MAC address. The following
- * define locates the octet the partid is in.
- */
-#define XPNET_PARTID_OCTET 1
-#define XPNET_LICENSE_OCTET 2
-
-
-/*
- * Define the XPNET debug device structure that is to be used with dev_dbg(),
- * dev_err(), dev_warn(), and dev_info().
- */
-struct device_driver xpnet_dbg_name = {
- .name = "xpnet"
-};
-
-struct device xpnet_dbg_subname = {
- .bus_id = {0}, /* set to "" */
- .driver = &xpnet_dbg_name
-};
-
-struct device *xpnet = &xpnet_dbg_subname;
-
-/*
- * Packet was recevied by XPC and forwarded to us.
- */
-static void
-xpnet_receive(partid_t partid, int channel, struct xpnet_message *msg)
-{
- struct sk_buff *skb;
- bte_result_t bret;
- struct xpnet_dev_private *priv =
- (struct xpnet_dev_private *) xpnet_device->priv;
-
-
- if (!XPNET_VALID_MSG(msg)) {
- /*
- * Packet with a different XPC version. Ignore.
- */
- xpc_received(partid, channel, (void *) msg);
-
- priv->stats.rx_errors++;
-
- return;
- }
- dev_dbg(xpnet, "received 0x%lx, %d, %d, %d\n", msg->buf_pa, msg->size,
- msg->leadin_ignore, msg->tailout_ignore);
-
-
- /* reserve an extra cache line */
- skb = dev_alloc_skb(msg->size + L1_CACHE_BYTES);
- if (!skb) {
- dev_err(xpnet, "failed on dev_alloc_skb(%d)\n",
- msg->size + L1_CACHE_BYTES);
-
- xpc_received(partid, channel, (void *) msg);
-
- priv->stats.rx_errors++;
-
- return;
- }
-
- /*
- * The allocated skb has some reserved space.
- * In order to use bte_copy, we need to get the
- * skb->data pointer moved forward.
- */
- skb_reserve(skb, (L1_CACHE_BYTES - ((u64)skb->data &
- (L1_CACHE_BYTES - 1)) +
- msg->leadin_ignore));
-
- /*
- * Update the tail pointer to indicate data actually
- * transferred.
- */
- skb_put(skb, (msg->size - msg->leadin_ignore - msg->tailout_ignore));
-
- /*
- * Move the data over from the other side.
- */
- if ((XPNET_VERSION_MINOR(msg->version) == 1) &&
- (msg->embedded_bytes != 0)) {
- dev_dbg(xpnet, "copying embedded message. memcpy(0x%p, 0x%p, "
- "%lu)\n", skb->data, &msg->data,
- (size_t) msg->embedded_bytes);
-
- skb_copy_to_linear_data(skb, &msg->data, (size_t)msg->embedded_bytes);
- } else {
- dev_dbg(xpnet, "transferring buffer to the skb->data area;\n\t"
- "bte_copy(0x%p, 0x%p, %hu)\n", (void *)msg->buf_pa,
- (void *)__pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
- msg->size);
-
- bret = bte_copy(msg->buf_pa,
- __pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
- msg->size, (BTE_NOTIFY | BTE_WACQUIRE), NULL);
-
- if (bret != BTE_SUCCESS) {
- // >>> Need better way of cleaning skb. Currently skb
- // >>> appears in_use and we can't just call
- // >>> dev_kfree_skb.
- dev_err(xpnet, "bte_copy(0x%p, 0x%p, 0x%hx) returned "
- "error=0x%x\n", (void *)msg->buf_pa,
- (void *)__pa((u64)skb->data &
- ~(L1_CACHE_BYTES - 1)),
- msg->size, bret);
-
- xpc_received(partid, channel, (void *) msg);
-
- priv->stats.rx_errors++;
-
- return;
- }
- }
-
- dev_dbg(xpnet, "<skb->head=0x%p skb->data=0x%p skb->tail=0x%p "
- "skb->end=0x%p skb->len=%d\n", (void *) skb->head,
- (void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb),
- skb->len);
-
- skb->protocol = eth_type_trans(skb, xpnet_device);
- skb->ip_summed = CHECKSUM_UNNECESSARY;
-
- dev_dbg(xpnet, "passing skb to network layer\n"
- KERN_DEBUG "\tskb->head=0x%p skb->data=0x%p skb->tail=0x%p "
- "skb->end=0x%p skb->len=%d\n",
- (void *)skb->head, (void *)skb->data, skb_tail_pointer(skb),
- skb_end_pointer(skb), skb->len);
-
-
- xpnet_device->last_rx = jiffies;
- priv->stats.rx_packets++;
- priv->stats.rx_bytes += skb->len + ETH_HLEN;
-
- netif_rx_ni(skb);
- xpc_received(partid, channel, (void *) msg);
-}
-
-
-/*
- * This is the handler which XPC calls during any sort of change in
- * state or message reception on a connection.
- */
-static void
-xpnet_connection_activity(enum xpc_retval reason, partid_t partid, int channel,
- void *data, void *key)
-{
- long bp;
-
-
- DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
- DBUG_ON(channel != XPC_NET_CHANNEL);
-
- switch(reason) {
- case xpcMsgReceived: /* message received */
- DBUG_ON(data == NULL);
-
- xpnet_receive(partid, channel, (struct xpnet_message *) data);
- break;
-
- case xpcConnected: /* connection completed to a partition */
- spin_lock_bh(&xpnet_broadcast_lock);
- xpnet_broadcast_partitions |= 1UL << (partid -1 );
- bp = xpnet_broadcast_partitions;
- spin_unlock_bh(&xpnet_broadcast_lock);
-
- netif_carrier_on(xpnet_device);
-
- dev_dbg(xpnet, "%s connection created to partition %d; "
- "xpnet_broadcast_partitions=0x%lx\n",
- xpnet_device->name, partid, bp);
- break;
-
- default:
- spin_lock_bh(&xpnet_broadcast_lock);
- xpnet_broadcast_partitions &= ~(1UL << (partid -1 ));
- bp = xpnet_broadcast_partitions;
- spin_unlock_bh(&xpnet_broadcast_lock);
-
- if (bp == 0) {
- netif_carrier_off(xpnet_device);
- }
-
- dev_dbg(xpnet, "%s disconnected from partition %d; "
- "xpnet_broadcast_partitions=0x%lx\n",
- xpnet_device->name, partid, bp);
- break;
-
- }
-}
-
-
-static int
-xpnet_dev_open(struct net_device *dev)
-{
- enum xpc_retval ret;
-
-
- dev_dbg(xpnet, "calling xpc_connect(%d, 0x%p, NULL, %ld, %ld, %ld, "
- "%ld)\n", XPC_NET_CHANNEL, xpnet_connection_activity,
- XPNET_MSG_SIZE, XPNET_MSG_NENTRIES, XPNET_MAX_KTHREADS,
- XPNET_MAX_IDLE_KTHREADS);
-
- ret = xpc_connect(XPC_NET_CHANNEL, xpnet_connection_activity, NULL,
- XPNET_MSG_SIZE, XPNET_MSG_NENTRIES,
- XPNET_MAX_KTHREADS, XPNET_MAX_IDLE_KTHREADS);
- if (ret != xpcSuccess) {
- dev_err(xpnet, "ifconfig up of %s failed on XPC connect, "
- "ret=%d\n", dev->name, ret);
-
- return -ENOMEM;
- }
-
- dev_dbg(xpnet, "ifconfig up of %s; XPC connected\n", dev->name);
-
- return 0;
-}
-
-
-static int
-xpnet_dev_stop(struct net_device *dev)
-{
- xpc_disconnect(XPC_NET_CHANNEL);
-
- dev_dbg(xpnet, "ifconfig down of %s; XPC disconnected\n", dev->name);
-
- return 0;
-}
-
-
-static int
-xpnet_dev_change_mtu(struct net_device *dev, int new_mtu)
-{
- /* 68 comes from min TCP+IP+MAC header */
- if ((new_mtu < 68) || (new_mtu > XPNET_MAX_MTU)) {
- dev_err(xpnet, "ifconfig %s mtu %d failed; value must be "
- "between 68 and %ld\n", dev->name, new_mtu,
- XPNET_MAX_MTU);
- return -EINVAL;
- }
-
- dev->mtu = new_mtu;
- dev_dbg(xpnet, "ifconfig %s mtu set to %d\n", dev->name, new_mtu);
- return 0;
-}
-
-
-/*
- * Required for the net_device structure.
- */
-static int
-xpnet_dev_set_config(struct net_device *dev, struct ifmap *new_map)
-{
- return 0;
-}
-
-
-/*
- * Return statistics to the caller.
- */
-static struct net_device_stats *
-xpnet_dev_get_stats(struct net_device *dev)
-{
- struct xpnet_dev_private *priv;
-
-
- priv = (struct xpnet_dev_private *) dev->priv;
-
- return &priv->stats;
-}
-
-
-/*
- * Notification that the other end has received the message and
- * DMA'd the skb information. At this point, they are done with
- * our side. When all recipients are done processing, we
- * release the skb and then release our pending message structure.
- */
-static void
-xpnet_send_completed(enum xpc_retval reason, partid_t partid, int channel,
- void *__qm)
-{
- struct xpnet_pending_msg *queued_msg =
- (struct xpnet_pending_msg *) __qm;
-
-
- DBUG_ON(queued_msg == NULL);
-
- dev_dbg(xpnet, "message to %d notified with reason %d\n",
- partid, reason);
-
- if (atomic_dec_return(&queued_msg->use_count) == 0) {
- dev_dbg(xpnet, "all acks for skb->head=-x%p\n",
- (void *) queued_msg->skb->head);
-
- dev_kfree_skb_any(queued_msg->skb);
- kfree(queued_msg);
- }
-}
-
-
-/*
- * Network layer has formatted a packet (skb) and is ready to place it
- * "on the wire". Prepare and send an xpnet_message to all partitions
- * which have connected with us and are targets of this packet.
- *
- * MAC-NOTE: For the XPNET driver, the MAC address contains the
- * destination partition_id. If the destination partition id word
- * is 0xff, this packet is to broadcast to all partitions.
- */
-static int
-xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- struct xpnet_pending_msg *queued_msg;
- enum xpc_retval ret;
- struct xpnet_message *msg;
- u64 start_addr, end_addr;
- long dp;
- u8 second_mac_octet;
- partid_t dest_partid;
- struct xpnet_dev_private *priv;
- u16 embedded_bytes;
-
-
- priv = (struct xpnet_dev_private *) dev->priv;
-
-
- dev_dbg(xpnet, ">skb->head=0x%p skb->data=0x%p skb->tail=0x%p "
- "skb->end=0x%p skb->len=%d\n", (void *) skb->head,
- (void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb),
- skb->len);
-
-
- /*
- * The xpnet_pending_msg tracks how many outstanding
- * xpc_send_notifies are relying on this skb. When none
- * remain, release the skb.
- */
- queued_msg = kmalloc(sizeof(struct xpnet_pending_msg), GFP_ATOMIC);
- if (queued_msg == NULL) {
- dev_warn(xpnet, "failed to kmalloc %ld bytes; dropping "
- "packet\n", sizeof(struct xpnet_pending_msg));
-
- priv->stats.tx_errors++;
-
- return -ENOMEM;
- }
-
-
- /* get the beginning of the first cacheline and end of last */
- start_addr = ((u64) skb->data & ~(L1_CACHE_BYTES - 1));
- end_addr = L1_CACHE_ALIGN((u64)skb_tail_pointer(skb));
-
- /* calculate how many bytes to embed in the XPC message */
- embedded_bytes = 0;
- if (unlikely(skb->len <= XPNET_MSG_DATA_MAX)) {
- /* skb->data does fit so embed */
- embedded_bytes = skb->len;
- }
-
-
- /*
- * Since the send occurs asynchronously, we set the count to one
- * and begin sending. Any sends that happen to complete before
- * we are done sending will not free the skb. We will be left
- * with that task during exit. This also handles the case of
- * a packet destined for a partition which is no longer up.
- */
- atomic_set(&queued_msg->use_count, 1);
- queued_msg->skb = skb;
-
-
- second_mac_octet = skb->data[XPNET_PARTID_OCTET];
- if (second_mac_octet == 0xff) {
- /* we are being asked to broadcast to all partitions */
- dp = xpnet_broadcast_partitions;
- } else if (second_mac_octet != 0) {
- dp = xpnet_broadcast_partitions &
- (1UL << (second_mac_octet - 1));
- } else {
- /* 0 is an invalid partid. Ignore */
- dp = 0;
- }
- dev_dbg(xpnet, "destination Partitions mask (dp) = 0x%lx\n", dp);
-
- /*
- * If we wanted to allow promiscuous mode to work like an
- * unswitched network, this would be a good point to OR in a
- * mask of partitions which should be receiving all packets.
- */
-
- /*
- * Main send loop.
- */
- for (dest_partid = 1; dp && dest_partid < XP_MAX_PARTITIONS;
- dest_partid++) {
-
-
- if (!(dp & (1UL << (dest_partid - 1)))) {
- /* not destined for this partition */
- continue;
- }
-
- /* remove this partition from the destinations mask */
- dp &= ~(1UL << (dest_partid - 1));
-
-
- /* found a partition to send to */
-
- ret = xpc_allocate(dest_partid, XPC_NET_CHANNEL,
- XPC_NOWAIT, (void **)&msg);
- if (unlikely(ret != xpcSuccess)) {
- continue;
- }
-
- msg->embedded_bytes = embedded_bytes;
- if (unlikely(embedded_bytes != 0)) {
- msg->version = XPNET_VERSION_EMBED;
- dev_dbg(xpnet, "calling memcpy(0x%p, 0x%p, 0x%lx)\n",
- &msg->data, skb->data, (size_t) embedded_bytes);
- skb_copy_from_linear_data(skb, &msg->data,
- (size_t)embedded_bytes);
- } else {
- msg->version = XPNET_VERSION;
- }
- msg->magic = XPNET_MAGIC;
- msg->size = end_addr - start_addr;
- msg->leadin_ignore = (u64) skb->data - start_addr;
- msg->tailout_ignore = end_addr - (u64)skb_tail_pointer(skb);
- msg->buf_pa = __pa(start_addr);
-
- dev_dbg(xpnet, "sending XPC message to %d:%d\n"
- KERN_DEBUG "msg->buf_pa=0x%lx, msg->size=%u, "
- "msg->leadin_ignore=%u, msg->tailout_ignore=%u\n",
- dest_partid, XPC_NET_CHANNEL, msg->buf_pa, msg->size,
- msg->leadin_ignore, msg->tailout_ignore);
-
-
- atomic_inc(&queued_msg->use_count);
-
- ret = xpc_send_notify(dest_partid, XPC_NET_CHANNEL, msg,
- xpnet_send_completed, queued_msg);
- if (unlikely(ret != xpcSuccess)) {
- atomic_dec(&queued_msg->use_count);
- continue;
- }
-
- }
-
- if (atomic_dec_return(&queued_msg->use_count) == 0) {
- dev_dbg(xpnet, "no partitions to receive packet destined for "
- "%d\n", dest_partid);
-
-
- dev_kfree_skb(skb);
- kfree(queued_msg);
- }
-
- priv->stats.tx_packets++;
- priv->stats.tx_bytes += skb->len;
-
- return 0;
-}
-
-
-/*
- * Deal with transmit timeouts coming from the network layer.
- */
-static void
-xpnet_dev_tx_timeout (struct net_device *dev)
-{
- struct xpnet_dev_private *priv;
-
-
- priv = (struct xpnet_dev_private *) dev->priv;
-
- priv->stats.tx_errors++;
- return;
-}
-
-
-static int __init
-xpnet_init(void)
-{
- int i;
- u32 license_num;
- int result = -ENOMEM;
-
-
- if (!ia64_platform_is("sn2")) {
- return -ENODEV;
- }
-
- dev_info(xpnet, "registering network device %s\n", XPNET_DEVICE_NAME);
-
- /*
- * use ether_setup() to init the majority of our device
- * structure and then override the necessary pieces.
- */
- xpnet_device = alloc_netdev(sizeof(struct xpnet_dev_private),
- XPNET_DEVICE_NAME, ether_setup);
- if (xpnet_device == NULL) {
- return -ENOMEM;
- }
-
- netif_carrier_off(xpnet_device);
-
- xpnet_device->mtu = XPNET_DEF_MTU;
- xpnet_device->change_mtu = xpnet_dev_change_mtu;
- xpnet_device->open = xpnet_dev_open;
- xpnet_device->get_stats = xpnet_dev_get_stats;
- xpnet_device->stop = xpnet_dev_stop;
- xpnet_device->hard_start_xmit = xpnet_dev_hard_start_xmit;
- xpnet_device->tx_timeout = xpnet_dev_tx_timeout;
- xpnet_device->set_config = xpnet_dev_set_config;
-
- /*
- * Multicast assumes the LSB of the first octet is set for multicast
- * MAC addresses. We chose the first octet of the MAC to be unlikely
- * to collide with any vendor's officially issued MAC.
- */
- xpnet_device->dev_addr[0] = 0xfe;
- xpnet_device->dev_addr[XPNET_PARTID_OCTET] = sn_partition_id;
- license_num = sn_partition_serial_number_val();
- for (i = 3; i >= 0; i--) {
- xpnet_device->dev_addr[XPNET_LICENSE_OCTET + i] =
- license_num & 0xff;
- license_num = license_num >> 8;
- }
-
- /*
- * ether_setup() sets this to a multicast device. We are
- * really not supporting multicast at this time.
- */
- xpnet_device->flags &= ~IFF_MULTICAST;
-
- /*
- * No need to checksum as it is a DMA transfer. The BTE will
- * report an error if the data is not retrievable and the
- * packet will be dropped.
- */
- xpnet_device->features = NETIF_F_NO_CSUM;
-
- result = register_netdev(xpnet_device);
- if (result != 0) {
- free_netdev(xpnet_device);
- }
-
- return result;
-}
-module_init(xpnet_init);
-
-
-static void __exit
-xpnet_exit(void)
-{
- dev_info(xpnet, "unregistering network device %s\n",
- xpnet_device[0].name);
-
- unregister_netdev(xpnet_device);
-
- free_netdev(xpnet_device);
-}
-module_exit(xpnet_exit);
-
-
-MODULE_AUTHOR("Silicon Graphics, Inc.");
-MODULE_DESCRIPTION("Cross Partition Network adapter (XPNET)");
-MODULE_LICENSE("GPL");
-
driver (SCSI/ATA) which supports enclosures
or a SCSI enclosure device (SES) to use these services.
+config SGI_XP
+ tristate "Support communication between SGI SSIs"
+ depends on IA64_GENERIC || IA64_SGI_SN2
+ select IA64_UNCACHED_ALLOCATOR if IA64_GENERIC || IA64_SGI_SN2
+ select GENERIC_ALLOCATOR if IA64_GENERIC || IA64_SGI_SN2
+ ---help---
+ An SGI machine can be divided into multiple Single System
+ Images which act independently of each other and have
+ hardware based memory protection from the others. Enabling
+ this feature will allow for direct communication between SSIs
+ based on a network adapter and DMA messaging.
+
endif # MISC_DEVICES
obj-$(CONFIG_INTEL_MENLOW) += intel_menlow.o
obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o
obj-$(CONFIG_KGDB_TESTS) += kgdbts.o
+obj-$(CONFIG_SGI_XP) += sgi-xp/
--- /dev/null
+#
+# Makefile for SGI's XP devices.
+#
+
+obj-$(CONFIG_SGI_XP) += xp.o
+xp-y := xp_main.o xp_nofault.o
+
+obj-$(CONFIG_SGI_XP) += xpc.o
+xpc-y := xpc_main.o xpc_channel.o xpc_partition.o
+
+obj-$(CONFIG_SGI_XP) += xpnet.o
--- /dev/null
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2004-2008 Silicon Graphics, Inc. All rights reserved.
+ */
+
+
+/*
+ * External Cross Partition (XP) structures and defines.
+ */
+
+
+#ifndef _DRIVERS_MISC_SGIXP_XP_H
+#define _DRIVERS_MISC_SGIXP_XP_H
+
+
+#include <linux/cache.h>
+#include <linux/hardirq.h>
+#include <linux/mutex.h>
+#include <asm/sn/types.h>
+#include <asm/sn/bte.h>
+
+
+#ifdef USE_DBUG_ON
+#define DBUG_ON(condition) BUG_ON(condition)
+#else
+#define DBUG_ON(condition)
+#endif
+
+
+/*
+ * Define the maximum number of logically defined partitions the system
+ * can support. It is constrained by the maximum number of hardware
+ * partitionable regions. The term 'region' in this context refers to the
+ * minimum number of nodes that can comprise an access protection grouping.
+ * The access protection is in regards to memory, IPI and IOI.
+ *
+ * The maximum number of hardware partitionable regions is equal to the
+ * maximum number of nodes in the entire system divided by the minimum number
+ * of nodes that comprise an access protection grouping.
+ */
+#define XP_MAX_PARTITIONS 64
+
+
+/*
+ * Define the number of u64s required to represent all the C-brick nasids
+ * as a bitmap. The cross-partition kernel modules deal only with
+ * C-brick nasids, thus the need for bitmaps which don't account for
+ * odd-numbered (non C-brick) nasids.
+ */
+#define XP_MAX_PHYSNODE_ID (MAX_NUMALINK_NODES / 2)
+#define XP_NASID_MASK_BYTES ((XP_MAX_PHYSNODE_ID + 7) / 8)
+#define XP_NASID_MASK_WORDS ((XP_MAX_PHYSNODE_ID + 63) / 64)
+
+
+/*
+ * Wrapper for bte_copy() that should it return a failure status will retry
+ * the bte_copy() once in the hope that the failure was due to a temporary
+ * aberration (i.e., the link going down temporarily).
+ *
+ * src - physical address of the source of the transfer.
+ * vdst - virtual address of the destination of the transfer.
+ * len - number of bytes to transfer from source to destination.
+ * mode - see bte_copy() for definition.
+ * notification - see bte_copy() for definition.
+ *
+ * Note: xp_bte_copy() should never be called while holding a spinlock.
+ */
+static inline bte_result_t
+xp_bte_copy(u64 src, u64 vdst, u64 len, u64 mode, void *notification)
+{
+ bte_result_t ret;
+ u64 pdst = ia64_tpa(vdst);
+
+
+ /*
+ * Ensure that the physically mapped memory is contiguous.
+ *
+ * We do this by ensuring that the memory is from region 7 only.
+ * If the need should arise to use memory from one of the other
+ * regions, then modify the BUG_ON() statement to ensure that the
+ * memory from that region is always physically contiguous.
+ */
+ BUG_ON(REGION_NUMBER(vdst) != RGN_KERNEL);
+
+ ret = bte_copy(src, pdst, len, mode, notification);
+ if ((ret != BTE_SUCCESS) && BTE_ERROR_RETRY(ret)) {
+ if (!in_interrupt()) {
+ cond_resched();
+ }
+ ret = bte_copy(src, pdst, len, mode, notification);
+ }
+
+ return ret;
+}
+
+
+/*
+ * XPC establishes channel connections between the local partition and any
+ * other partition that is currently up. Over these channels, kernel-level
+ * `users' can communicate with their counterparts on the other partitions.
+ *
+ * The maxinum number of channels is limited to eight. For performance reasons,
+ * the internal cross partition structures require sixteen bytes per channel,
+ * and eight allows all of this interface-shared info to fit in one cache line.
+ *
+ * XPC_NCHANNELS reflects the total number of channels currently defined.
+ * If the need for additional channels arises, one can simply increase
+ * XPC_NCHANNELS accordingly. If the day should come where that number
+ * exceeds the MAXIMUM number of channels allowed (eight), then one will need
+ * to make changes to the XPC code to allow for this.
+ */
+#define XPC_MEM_CHANNEL 0 /* memory channel number */
+#define XPC_NET_CHANNEL 1 /* network channel number */
+
+#define XPC_NCHANNELS 2 /* #of defined channels */
+#define XPC_MAX_NCHANNELS 8 /* max #of channels allowed */
+
+#if XPC_NCHANNELS > XPC_MAX_NCHANNELS
+#error XPC_NCHANNELS exceeds MAXIMUM allowed.
+#endif
+
+
+/*
+ * The format of an XPC message is as follows:
+ *
+ * +-------+--------------------------------+
+ * | flags |////////////////////////////////|
+ * +-------+--------------------------------+
+ * | message # |
+ * +----------------------------------------+
+ * | payload (user-defined message) |
+ * | |
+ * :
+ * | |
+ * +----------------------------------------+
+ *
+ * The size of the payload is defined by the user via xpc_connect(). A user-
+ * defined message resides in the payload area.
+ *
+ * The user should have no dealings with the message header, but only the
+ * message's payload. When a message entry is allocated (via xpc_allocate())
+ * a pointer to the payload area is returned and not the actual beginning of
+ * the XPC message. The user then constructs a message in the payload area
+ * and passes that pointer as an argument on xpc_send() or xpc_send_notify().
+ *
+ * The size of a message entry (within a message queue) must be a cacheline
+ * sized multiple in order to facilitate the BTE transfer of messages from one
+ * message queue to another. A macro, XPC_MSG_SIZE(), is provided for the user
+ * that wants to fit as many msg entries as possible in a given memory size
+ * (e.g. a memory page).
+ */
+struct xpc_msg {
+ u8 flags; /* FOR XPC INTERNAL USE ONLY */
+ u8 reserved[7]; /* FOR XPC INTERNAL USE ONLY */
+ s64 number; /* FOR XPC INTERNAL USE ONLY */
+
+ u64 payload; /* user defined portion of message */
+};
+
+
+#define XPC_MSG_PAYLOAD_OFFSET (u64) (&((struct xpc_msg *)0)->payload)
+#define XPC_MSG_SIZE(_payload_size) \
+ L1_CACHE_ALIGN(XPC_MSG_PAYLOAD_OFFSET + (_payload_size))
+
+
+/*
+ * Define the return values and values passed to user's callout functions.
+ * (It is important to add new value codes at the end just preceding
+ * xpcUnknownReason, which must have the highest numerical value.)
+ */
+enum xpc_retval {
+ xpcSuccess = 0,
+
+ xpcNotConnected, /* 1: channel is not connected */
+ xpcConnected, /* 2: channel connected (opened) */
+ xpcRETIRED1, /* 3: (formerly xpcDisconnected) */
+
+ xpcMsgReceived, /* 4: message received */
+ xpcMsgDelivered, /* 5: message delivered and acknowledged */
+
+ xpcRETIRED2, /* 6: (formerly xpcTransferFailed) */
+
+ xpcNoWait, /* 7: operation would require wait */
+ xpcRetry, /* 8: retry operation */
+ xpcTimeout, /* 9: timeout in xpc_allocate_msg_wait() */
+ xpcInterrupted, /* 10: interrupted wait */
+
+ xpcUnequalMsgSizes, /* 11: message size disparity between sides */
+ xpcInvalidAddress, /* 12: invalid address */
+
+ xpcNoMemory, /* 13: no memory available for XPC structures */
+ xpcLackOfResources, /* 14: insufficient resources for operation */
+ xpcUnregistered, /* 15: channel is not registered */
+ xpcAlreadyRegistered, /* 16: channel is already registered */
+
+ xpcPartitionDown, /* 17: remote partition is down */
+ xpcNotLoaded, /* 18: XPC module is not loaded */
+ xpcUnloading, /* 19: this side is unloading XPC module */
+
+ xpcBadMagic, /* 20: XPC MAGIC string not found */
+
+ xpcReactivating, /* 21: remote partition was reactivated */
+
+ xpcUnregistering, /* 22: this side is unregistering channel */
+ xpcOtherUnregistering, /* 23: other side is unregistering channel */
+
+ xpcCloneKThread, /* 24: cloning kernel thread */
+ xpcCloneKThreadFailed, /* 25: cloning kernel thread failed */
+
+ xpcNoHeartbeat, /* 26: remote partition has no heartbeat */
+
+ xpcPioReadError, /* 27: PIO read error */
+ xpcPhysAddrRegFailed, /* 28: registration of phys addr range failed */
+
+ xpcBteDirectoryError, /* 29: maps to BTEFAIL_DIR */
+ xpcBtePoisonError, /* 30: maps to BTEFAIL_POISON */
+ xpcBteWriteError, /* 31: maps to BTEFAIL_WERR */
+ xpcBteAccessError, /* 32: maps to BTEFAIL_ACCESS */
+ xpcBtePWriteError, /* 33: maps to BTEFAIL_PWERR */
+ xpcBtePReadError, /* 34: maps to BTEFAIL_PRERR */
+ xpcBteTimeOutError, /* 35: maps to BTEFAIL_TOUT */
+ xpcBteXtalkError, /* 36: maps to BTEFAIL_XTERR */
+ xpcBteNotAvailable, /* 37: maps to BTEFAIL_NOTAVAIL */
+ xpcBteUnmappedError, /* 38: unmapped BTEFAIL_ error */
+
+ xpcBadVersion, /* 39: bad version number */
+ xpcVarsNotSet, /* 40: the XPC variables are not set up */
+ xpcNoRsvdPageAddr, /* 41: unable to get rsvd page's phys addr */
+ xpcInvalidPartid, /* 42: invalid partition ID */
+ xpcLocalPartid, /* 43: local partition ID */
+
+ xpcOtherGoingDown, /* 44: other side going down, reason unknown */
+ xpcSystemGoingDown, /* 45: system is going down, reason unknown */
+ xpcSystemHalt, /* 46: system is being halted */
+ xpcSystemReboot, /* 47: system is being rebooted */
+ xpcSystemPoweroff, /* 48: system is being powered off */
+
+ xpcDisconnecting, /* 49: channel disconnecting (closing) */
+
+ xpcOpenCloseError, /* 50: channel open/close protocol error */
+
+ xpcDisconnected, /* 51: channel disconnected (closed) */
+
+ xpcBteSh2Start, /* 52: BTE CRB timeout */
+
+ /* 53: 0x1 BTE Error Response Short */
+ xpcBteSh2RspShort = xpcBteSh2Start + BTEFAIL_SH2_RESP_SHORT,
+
+ /* 54: 0x2 BTE Error Response Long */
+ xpcBteSh2RspLong = xpcBteSh2Start + BTEFAIL_SH2_RESP_LONG,
+
+ /* 56: 0x4 BTE Error Response DSB */
+ xpcBteSh2RspDSB = xpcBteSh2Start + BTEFAIL_SH2_RESP_DSP,
+
+ /* 60: 0x8 BTE Error Response Access */
+ xpcBteSh2RspAccess = xpcBteSh2Start + BTEFAIL_SH2_RESP_ACCESS,
+
+ /* 68: 0x10 BTE Error CRB timeout */
+ xpcBteSh2CRBTO = xpcBteSh2Start + BTEFAIL_SH2_CRB_TO,
+
+ /* 84: 0x20 BTE Error NACK limit */
+ xpcBteSh2NACKLimit = xpcBteSh2Start + BTEFAIL_SH2_NACK_LIMIT,
+
+ /* 115: BTE end */
+ xpcBteSh2End = xpcBteSh2Start + BTEFAIL_SH2_ALL,
+
+ xpcUnknownReason /* 116: unknown reason -- must be last in list */
+};
+
+
+/*
+ * Define the callout function types used by XPC to update the user on
+ * connection activity and state changes (via the user function registered by
+ * xpc_connect()) and to notify them of messages received and delivered (via
+ * the user function registered by xpc_send_notify()).
+ *
+ * The two function types are xpc_channel_func and xpc_notify_func and
+ * both share the following arguments, with the exception of "data", which
+ * only xpc_channel_func has.
+ *
+ * Arguments:
+ *
+ * reason - reason code. (See following table.)
+ * partid - partition ID associated with condition.
+ * ch_number - channel # associated with condition.
+ * data - pointer to optional data. (See following table.)
+ * key - pointer to optional user-defined value provided as the "key"
+ * argument to xpc_connect() or xpc_send_notify().
+ *
+ * In the following table the "Optional Data" column applies to callouts made
+ * to functions registered by xpc_connect(). A "NA" in that column indicates
+ * that this reason code can be passed to functions registered by
+ * xpc_send_notify() (i.e. they don't have data arguments).
+ *
+ * Also, the first three reason codes in the following table indicate
+ * success, whereas the others indicate failure. When a failure reason code
+ * is received, one can assume that the channel is not connected.
+ *
+ *
+ * Reason Code | Cause | Optional Data
+ * =====================+================================+=====================
+ * xpcConnected | connection has been established| max #of entries
+ * | to the specified partition on | allowed in message
+ * | the specified channel | queue
+ * ---------------------+--------------------------------+---------------------
+ * xpcMsgReceived | an XPC message arrived from | address of payload
+ * | the specified partition on the |
+ * | specified channel | [the user must call
+ * | | xpc_received() when
+ * | | finished with the
+ * | | payload]
+ * ---------------------+--------------------------------+---------------------
+ * xpcMsgDelivered | notification that the message | NA
+ * | was delivered to the intended |
+ * | recipient and that they have |
+ * | acknowledged its receipt by |
+ * | calling xpc_received() |
+ * =====================+================================+=====================
+ * xpcUnequalMsgSizes | can't connect to the specified | NULL
+ * | partition on the specified |
+ * | channel because of mismatched |
+ * | message sizes |
+ * ---------------------+--------------------------------+---------------------
+ * xpcNoMemory | insufficient memory avaiable | NULL
+ * | to allocate message queue |
+ * ---------------------+--------------------------------+---------------------
+ * xpcLackOfResources | lack of resources to create | NULL
+ * | the necessary kthreads to |
+ * | support the channel |
+ * ---------------------+--------------------------------+---------------------
+ * xpcUnregistering | this side's user has | NULL or NA
+ * | unregistered by calling |
+ * | xpc_disconnect() |
+ * ---------------------+--------------------------------+---------------------
+ * xpcOtherUnregistering| the other side's user has | NULL or NA
+ * | unregistered by calling |
+ * | xpc_disconnect() |
+ * ---------------------+--------------------------------+---------------------
+ * xpcNoHeartbeat | the other side's XPC is no | NULL or NA
+ * | longer heartbeating |
+ * | |
+ * ---------------------+--------------------------------+---------------------
+ * xpcUnloading | this side's XPC module is | NULL or NA
+ * | being unloaded |
+ * | |
+ * ---------------------+--------------------------------+---------------------
+ * xpcOtherUnloading | the other side's XPC module is | NULL or NA
+ * | is being unloaded |
+ * | |
+ * ---------------------+--------------------------------+---------------------
+ * xpcPioReadError | xp_nofault_PIOR() returned an | NULL or NA
+ * | error while sending an IPI |
+ * | |
+ * ---------------------+--------------------------------+---------------------
+ * xpcInvalidAddress | the address either received or | NULL or NA
+ * | sent by the specified partition|
+ * | is invalid |
+ * ---------------------+--------------------------------+---------------------
+ * xpcBteNotAvailable | attempt to pull data from the | NULL or NA
+ * xpcBtePoisonError | specified partition over the |
+ * xpcBteWriteError | specified channel via a |
+ * xpcBteAccessError | bte_copy() failed |
+ * xpcBteTimeOutError | |
+ * xpcBteXtalkError | |
+ * xpcBteDirectoryError | |
+ * xpcBteGenericError | |
+ * xpcBteUnmappedError | |
+ * ---------------------+--------------------------------+---------------------
+ * xpcUnknownReason | the specified channel to the | NULL or NA
+ * | specified partition was |
+ * | unavailable for unknown reasons|
+ * =====================+================================+=====================
+ */
+
+typedef void (*xpc_channel_func)(enum xpc_retval reason, partid_t partid,
+ int ch_number, void *data, void *key);
+
+typedef void (*xpc_notify_func)(enum xpc_retval reason, partid_t partid,
+ int ch_number, void *key);
+
+
+/*
+ * The following is a registration entry. There is a global array of these,
+ * one per channel. It is used to record the connection registration made
+ * by the users of XPC. As long as a registration entry exists, for any
+ * partition that comes up, XPC will attempt to establish a connection on
+ * that channel. Notification that a connection has been made will occur via
+ * the xpc_channel_func function.
+ *
+ * The 'func' field points to the function to call when aynchronous
+ * notification is required for such events as: a connection established/lost,
+ * or an incoming message received, or an error condition encountered. A
+ * non-NULL 'func' field indicates that there is an active registration for
+ * the channel.
+ */
+struct xpc_registration {
+ struct mutex mutex;
+ xpc_channel_func func; /* function to call */
+ void *key; /* pointer to user's key */
+ u16 nentries; /* #of msg entries in local msg queue */
+ u16 msg_size; /* message queue's message size */
+ u32 assigned_limit; /* limit on #of assigned kthreads */
+ u32 idle_limit; /* limit on #of idle kthreads */
+} ____cacheline_aligned;
+
+
+#define XPC_CHANNEL_REGISTERED(_c) (xpc_registrations[_c].func != NULL)
+
+
+/* the following are valid xpc_allocate() flags */
+#define XPC_WAIT 0 /* wait flag */
+#define XPC_NOWAIT 1 /* no wait flag */
+
+
+struct xpc_interface {
+ void (*connect)(int);
+ void (*disconnect)(int);
+ enum xpc_retval (*allocate)(partid_t, int, u32, void **);
+ enum xpc_retval (*send)(partid_t, int, void *);
+ enum xpc_retval (*send_notify)(partid_t, int, void *,
+ xpc_notify_func, void *);
+ void (*received)(partid_t, int, void *);
+ enum xpc_retval (*partid_to_nasids)(partid_t, void *);
+};
+
+
+extern struct xpc_interface xpc_interface;
+
+extern void xpc_set_interface(void (*)(int),
+ void (*)(int),
+ enum xpc_retval (*)(partid_t, int, u32, void **),
+ enum xpc_retval (*)(partid_t, int, void *),
+ enum xpc_retval (*)(partid_t, int, void *, xpc_notify_func,
+ void *),
+ void (*)(partid_t, int, void *),
+ enum xpc_retval (*)(partid_t, void *));
+extern void xpc_clear_interface(void);
+
+
+extern enum xpc_retval xpc_connect(int, xpc_channel_func, void *, u16,
+ u16, u32, u32);
+extern void xpc_disconnect(int);
+
+static inline enum xpc_retval
+xpc_allocate(partid_t partid, int ch_number, u32 flags, void **payload)
+{
+ return xpc_interface.allocate(partid, ch_number, flags, payload);
+}
+
+static inline enum xpc_retval
+xpc_send(partid_t partid, int ch_number, void *payload)
+{
+ return xpc_interface.send(partid, ch_number, payload);
+}
+
+static inline enum xpc_retval
+xpc_send_notify(partid_t partid, int ch_number, void *payload,
+ xpc_notify_func func, void *key)
+{
+ return xpc_interface.send_notify(partid, ch_number, payload, func, key);
+}
+
+static inline void
+xpc_received(partid_t partid, int ch_number, void *payload)
+{
+ return xpc_interface.received(partid, ch_number, payload);
+}
+
+static inline enum xpc_retval
+xpc_partid_to_nasids(partid_t partid, void *nasids)
+{
+ return xpc_interface.partid_to_nasids(partid, nasids);
+}
+
+
+extern u64 xp_nofault_PIOR_target;
+extern int xp_nofault_PIOR(void *);
+extern int xp_error_PIOR(void);
+
+
+#endif /* _DRIVERS_MISC_SGIXP_XP_H */
+
--- /dev/null
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
+ */
+
+
+/*
+ * Cross Partition (XP) base.
+ *
+ * XP provides a base from which its users can interact
+ * with XPC, yet not be dependent on XPC.
+ *
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/sn_sal.h>
+#include "xp.h"
+
+
+/*
+ * Target of nofault PIO read.
+ */
+u64 xp_nofault_PIOR_target;
+
+
+/*
+ * xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level
+ * users of XPC.
+ */
+struct xpc_registration xpc_registrations[XPC_NCHANNELS];
+
+
+/*
+ * Initialize the XPC interface to indicate that XPC isn't loaded.
+ */
+static enum xpc_retval xpc_notloaded(void) { return xpcNotLoaded; }
+
+struct xpc_interface xpc_interface = {
+ (void (*)(int)) xpc_notloaded,
+ (void (*)(int)) xpc_notloaded,
+ (enum xpc_retval (*)(partid_t, int, u32, void **)) xpc_notloaded,
+ (enum xpc_retval (*)(partid_t, int, void *)) xpc_notloaded,
+ (enum xpc_retval (*)(partid_t, int, void *, xpc_notify_func, void *))
+ xpc_notloaded,
+ (void (*)(partid_t, int, void *)) xpc_notloaded,
+ (enum xpc_retval (*)(partid_t, void *)) xpc_notloaded
+};
+
+
+/*
+ * XPC calls this when it (the XPC module) has been loaded.
+ */
+void
+xpc_set_interface(void (*connect)(int),
+ void (*disconnect)(int),
+ enum xpc_retval (*allocate)(partid_t, int, u32, void **),
+ enum xpc_retval (*send)(partid_t, int, void *),
+ enum xpc_retval (*send_notify)(partid_t, int, void *,
+ xpc_notify_func, void *),
+ void (*received)(partid_t, int, void *),
+ enum xpc_retval (*partid_to_nasids)(partid_t, void *))
+{
+ xpc_interface.connect = connect;
+ xpc_interface.disconnect = disconnect;
+ xpc_interface.allocate = allocate;
+ xpc_interface.send = send;
+ xpc_interface.send_notify = send_notify;
+ xpc_interface.received = received;
+ xpc_interface.partid_to_nasids = partid_to_nasids;
+}
+
+
+/*
+ * XPC calls this when it (the XPC module) is being unloaded.
+ */
+void
+xpc_clear_interface(void)
+{
+ xpc_interface.connect = (void (*)(int)) xpc_notloaded;
+ xpc_interface.disconnect = (void (*)(int)) xpc_notloaded;
+ xpc_interface.allocate = (enum xpc_retval (*)(partid_t, int, u32,
+ void **)) xpc_notloaded;
+ xpc_interface.send = (enum xpc_retval (*)(partid_t, int, void *))
+ xpc_notloaded;
+ xpc_interface.send_notify = (enum xpc_retval (*)(partid_t, int, void *,
+ xpc_notify_func, void *)) xpc_notloaded;
+ xpc_interface.received = (void (*)(partid_t, int, void *))
+ xpc_notloaded;
+ xpc_interface.partid_to_nasids = (enum xpc_retval (*)(partid_t, void *))
+ xpc_notloaded;
+}
+
+
+/*
+ * Register for automatic establishment of a channel connection whenever
+ * a partition comes up.
+ *
+ * Arguments:
+ *
+ * ch_number - channel # to register for connection.
+ * func - function to call for asynchronous notification of channel
+ * state changes (i.e., connection, disconnection, error) and
+ * the arrival of incoming messages.
+ * key - pointer to optional user-defined value that gets passed back
+ * to the user on any callouts made to func.
+ * payload_size - size in bytes of the XPC message's payload area which
+ * contains a user-defined message. The user should make
+ * this large enough to hold their largest message.
+ * nentries - max #of XPC message entries a message queue can contain.
+ * The actual number, which is determined when a connection
+ * is established and may be less then requested, will be
+ * passed to the user via the xpcConnected callout.
+ * assigned_limit - max number of kthreads allowed to be processing
+ * messages (per connection) at any given instant.
+ * idle_limit - max number of kthreads allowed to be idle at any given
+ * instant.
+ */
+enum xpc_retval
+xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size,
+ u16 nentries, u32 assigned_limit, u32 idle_limit)
+{
+ struct xpc_registration *registration;
+
+
+ DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
+ DBUG_ON(payload_size == 0 || nentries == 0);
+ DBUG_ON(func == NULL);
+ DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit);
+
+ registration = &xpc_registrations[ch_number];
+
+ if (mutex_lock_interruptible(®istration->mutex) != 0) {
+ return xpcInterrupted;
+ }
+
+ /* if XPC_CHANNEL_REGISTERED(ch_number) */
+ if (registration->func != NULL) {
+ mutex_unlock(®istration->mutex);
+ return xpcAlreadyRegistered;
+ }
+
+ /* register the channel for connection */
+ registration->msg_size = XPC_MSG_SIZE(payload_size);
+ registration->nentries = nentries;
+ registration->assigned_limit = assigned_limit;
+ registration->idle_limit = idle_limit;
+ registration->key = key;
+ registration->func = func;
+
+ mutex_unlock(®istration->mutex);
+
+ xpc_interface.connect(ch_number);
+
+ return xpcSuccess;
+}
+
+
+/*
+ * Remove the registration for automatic connection of the specified channel
+ * when a partition comes up.
+ *
+ * Before returning this xpc_disconnect() will wait for all connections on the
+ * specified channel have been closed/torndown. So the caller can be assured
+ * that they will not be receiving any more callouts from XPC to their
+ * function registered via xpc_connect().
+ *
+ * Arguments:
+ *
+ * ch_number - channel # to unregister.
+ */
+void
+xpc_disconnect(int ch_number)
+{
+ struct xpc_registration *registration;
+
+
+ DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
+
+ registration = &xpc_registrations[ch_number];
+
+ /*
+ * We've decided not to make this a down_interruptible(), since we
+ * figured XPC's users will just turn around and call xpc_disconnect()
+ * again anyways, so we might as well wait, if need be.
+ */
+ mutex_lock(®istration->mutex);
+
+ /* if !XPC_CHANNEL_REGISTERED(ch_number) */
+ if (registration->func == NULL) {
+ mutex_unlock(®istration->mutex);
+ return;
+ }
+
+ /* remove the connection registration for the specified channel */
+ registration->func = NULL;
+ registration->key = NULL;
+ registration->nentries = 0;
+ registration->msg_size = 0;
+ registration->assigned_limit = 0;
+ registration->idle_limit = 0;
+
+ xpc_interface.disconnect(ch_number);
+
+ mutex_unlock(®istration->mutex);
+
+ return;
+}
+
+
+int __init
+xp_init(void)
+{
+ int ret, ch_number;
+ u64 func_addr = *(u64 *) xp_nofault_PIOR;
+ u64 err_func_addr = *(u64 *) xp_error_PIOR;
+
+
+ if (!ia64_platform_is("sn2")) {
+ return -ENODEV;
+ }
+
+ /*
+ * Register a nofault code region which performs a cross-partition
+ * PIO read. If the PIO read times out, the MCA handler will consume
+ * the error and return to a kernel-provided instruction to indicate
+ * an error. This PIO read exists because it is guaranteed to timeout
+ * if the destination is down (AMO operations do not timeout on at
+ * least some CPUs on Shubs <= v1.2, which unfortunately we have to
+ * work around).
+ */
+ if ((ret = sn_register_nofault_code(func_addr, err_func_addr,
+ err_func_addr, 1, 1)) != 0) {
+ printk(KERN_ERR "XP: can't register nofault code, error=%d\n",
+ ret);
+ }
+ /*
+ * Setup the nofault PIO read target. (There is no special reason why
+ * SH_IPI_ACCESS was selected.)
+ */
+ if (is_shub2()) {
+ xp_nofault_PIOR_target = SH2_IPI_ACCESS0;
+ } else {
+ xp_nofault_PIOR_target = SH1_IPI_ACCESS;
+ }
+
+ /* initialize the connection registration mutex */
+ for (ch_number = 0; ch_number < XPC_NCHANNELS; ch_number++) {
+ mutex_init(&xpc_registrations[ch_number].mutex);
+ }
+
+ return 0;
+}
+module_init(xp_init);
+
+
+void __exit
+xp_exit(void)
+{
+ u64 func_addr = *(u64 *) xp_nofault_PIOR;
+ u64 err_func_addr = *(u64 *) xp_error_PIOR;
+
+
+ /* unregister the PIO read nofault code region */
+ (void) sn_register_nofault_code(func_addr, err_func_addr,
+ err_func_addr, 1, 0);
+}
+module_exit(xp_exit);
+
+
+MODULE_AUTHOR("Silicon Graphics, Inc.");
+MODULE_DESCRIPTION("Cross Partition (XP) base");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(xp_nofault_PIOR);
+EXPORT_SYMBOL(xp_nofault_PIOR_target);
+EXPORT_SYMBOL(xpc_registrations);
+EXPORT_SYMBOL(xpc_interface);
+EXPORT_SYMBOL(xpc_clear_interface);
+EXPORT_SYMBOL(xpc_set_interface);
+EXPORT_SYMBOL(xpc_connect);
+EXPORT_SYMBOL(xpc_disconnect);
+
--- /dev/null
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
+ */
+
+
+/*
+ * The xp_nofault_PIOR function takes a pointer to a remote PIO register
+ * and attempts to load and consume a value from it. This function
+ * will be registered as a nofault code block. In the event that the
+ * PIO read fails, the MCA handler will force the error to look
+ * corrected and vector to the xp_error_PIOR which will return an error.
+ *
+ * The definition of "consumption" and the time it takes for an MCA
+ * to surface is processor implementation specific. This code
+ * is sufficient on Itanium through the Montvale processor family.
+ * It may need to be adjusted for future processor implementations.
+ *
+ * extern int xp_nofault_PIOR(void *remote_register);
+ */
+
+ .global xp_nofault_PIOR
+xp_nofault_PIOR:
+ mov r8=r0 // Stage a success return value
+ ld8.acq r9=[r32];; // PIO Read the specified register
+ adds r9=1,r9;; // Add to force consumption
+ srlz.i;; // Allow time for MCA to surface
+ br.ret.sptk.many b0;; // Return success
+
+ .global xp_error_PIOR
+xp_error_PIOR:
+ mov r8=1 // Return value of 1
+ br.ret.sptk.many b0;; // Return failure
--- /dev/null
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
+ */
+
+
+/*
+ * Cross Partition Communication (XPC) structures and macros.
+ */
+
+#ifndef _DRIVERS_MISC_SGIXP_XPC_H
+#define _DRIVERS_MISC_SGIXP_XPC_H
+
+
+#include <linux/interrupt.h>
+#include <linux/sysctl.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/completion.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/sn/bte.h>
+#include <asm/sn/clksupport.h>
+#include <asm/sn/addrs.h>
+#include <asm/sn/mspec.h>
+#include <asm/sn/shub_mmr.h>
+#include "xp.h"
+
+
+/*
+ * XPC Version numbers consist of a major and minor number. XPC can always
+ * talk to versions with same major #, and never talk to versions with a
+ * different major #.
+ */
+#define _XPC_VERSION(_maj, _min) (((_maj) << 4) | ((_min) & 0xf))
+#define XPC_VERSION_MAJOR(_v) ((_v) >> 4)
+#define XPC_VERSION_MINOR(_v) ((_v) & 0xf)
+
+
+/*
+ * The next macros define word or bit representations for given
+ * C-brick nasid in either the SAL provided bit array representing
+ * nasids in the partition/machine or the AMO_t array used for
+ * inter-partition initiation communications.
+ *
+ * For SN2 machines, C-Bricks are alway even numbered NASIDs. As
+ * such, some space will be saved by insisting that nasid information
+ * passed from SAL always be packed for C-Bricks and the
+ * cross-partition interrupts use the same packing scheme.
+ */
+#define XPC_NASID_W_INDEX(_n) (((_n) / 64) / 2)
+#define XPC_NASID_B_INDEX(_n) (((_n) / 2) & (64 - 1))
+#define XPC_NASID_IN_ARRAY(_n, _p) ((_p)[XPC_NASID_W_INDEX(_n)] & \
+ (1UL << XPC_NASID_B_INDEX(_n)))
+#define XPC_NASID_FROM_W_B(_w, _b) (((_w) * 64 + (_b)) * 2)
+
+#define XPC_HB_DEFAULT_INTERVAL 5 /* incr HB every x secs */
+#define XPC_HB_CHECK_DEFAULT_INTERVAL 20 /* check HB every x secs */
+
+/* define the process name of HB checker and the CPU it is pinned to */
+#define XPC_HB_CHECK_THREAD_NAME "xpc_hb"
+#define XPC_HB_CHECK_CPU 0
+
+/* define the process name of the discovery thread */
+#define XPC_DISCOVERY_THREAD_NAME "xpc_discovery"
+
+
+/*
+ * the reserved page
+ *
+ * SAL reserves one page of memory per partition for XPC. Though a full page
+ * in length (16384 bytes), its starting address is not page aligned, but it
+ * is cacheline aligned. The reserved page consists of the following:
+ *
+ * reserved page header
+ *
+ * The first cacheline of the reserved page contains the header
+ * (struct xpc_rsvd_page). Before SAL initialization has completed,
+ * SAL has set up the following fields of the reserved page header:
+ * SAL_signature, SAL_version, partid, and nasids_size. The other
+ * fields are set up by XPC. (xpc_rsvd_page points to the local
+ * partition's reserved page.)
+ *
+ * part_nasids mask
+ * mach_nasids mask
+ *
+ * SAL also sets up two bitmaps (or masks), one that reflects the actual
+ * nasids in this partition (part_nasids), and the other that reflects
+ * the actual nasids in the entire machine (mach_nasids). We're only
+ * interested in the even numbered nasids (which contain the processors
+ * and/or memory), so we only need half as many bits to represent the
+ * nasids. The part_nasids mask is located starting at the first cacheline
+ * following the reserved page header. The mach_nasids mask follows right
+ * after the part_nasids mask. The size in bytes of each mask is reflected
+ * by the reserved page header field 'nasids_size'. (Local partition's
+ * mask pointers are xpc_part_nasids and xpc_mach_nasids.)
+ *
+ * vars
+ * vars part
+ *
+ * Immediately following the mach_nasids mask are the XPC variables
+ * required by other partitions. First are those that are generic to all
+ * partitions (vars), followed on the next available cacheline by those
+ * which are partition specific (vars part). These are setup by XPC.
+ * (Local partition's vars pointers are xpc_vars and xpc_vars_part.)
+ *
+ * Note: Until vars_pa is set, the partition XPC code has not been initialized.
+ */
+struct xpc_rsvd_page {
+ u64 SAL_signature; /* SAL: unique signature */
+ u64 SAL_version; /* SAL: version */
+ u8 partid; /* SAL: partition ID */
+ u8 version;
+ u8 pad1[6]; /* align to next u64 in cacheline */
+ volatile u64 vars_pa;
+ struct timespec stamp; /* time when reserved page was setup by XPC */
+ u64 pad2[9]; /* align to last u64 in cacheline */
+ u64 nasids_size; /* SAL: size of each nasid mask in bytes */
+};
+
+#define XPC_RP_VERSION _XPC_VERSION(1,1) /* version 1.1 of the reserved page */
+
+#define XPC_SUPPORTS_RP_STAMP(_version) \
+ (_version >= _XPC_VERSION(1,1))
+
+/*
+ * compare stamps - the return value is:
+ *
+ * < 0, if stamp1 < stamp2
+ * = 0, if stamp1 == stamp2
+ * > 0, if stamp1 > stamp2
+ */
+static inline int
+xpc_compare_stamps(struct timespec *stamp1, struct timespec *stamp2)
+{
+ int ret;
+
+
+ if ((ret = stamp1->tv_sec - stamp2->tv_sec) == 0) {
+ ret = stamp1->tv_nsec - stamp2->tv_nsec;
+ }
+ return ret;
+}
+
+
+/*
+ * Define the structures by which XPC variables can be exported to other
+ * partitions. (There are two: struct xpc_vars and struct xpc_vars_part)
+ */
+
+/*
+ * The following structure describes the partition generic variables
+ * needed by other partitions in order to properly initialize.
+ *
+ * struct xpc_vars version number also applies to struct xpc_vars_part.
+ * Changes to either structure and/or related functionality should be
+ * reflected by incrementing either the major or minor version numbers
+ * of struct xpc_vars.
+ */
+struct xpc_vars {
+ u8 version;
+ u64 heartbeat;
+ u64 heartbeating_to_mask;
+ u64 heartbeat_offline; /* if 0, heartbeat should be changing */
+ int act_nasid;
+ int act_phys_cpuid;
+ u64 vars_part_pa;
+ u64 amos_page_pa; /* paddr of page of AMOs from MSPEC driver */
+ AMO_t *amos_page; /* vaddr of page of AMOs from MSPEC driver */
+};
+
+#define XPC_V_VERSION _XPC_VERSION(3,1) /* version 3.1 of the cross vars */
+
+#define XPC_SUPPORTS_DISENGAGE_REQUEST(_version) \
+ (_version >= _XPC_VERSION(3,1))
+
+
+static inline int
+xpc_hb_allowed(partid_t partid, struct xpc_vars *vars)
+{
+ return ((vars->heartbeating_to_mask & (1UL << partid)) != 0);
+}
+
+static inline void
+xpc_allow_hb(partid_t partid, struct xpc_vars *vars)
+{
+ u64 old_mask, new_mask;
+
+ do {
+ old_mask = vars->heartbeating_to_mask;
+ new_mask = (old_mask | (1UL << partid));
+ } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) !=
+ old_mask);
+}
+
+static inline void
+xpc_disallow_hb(partid_t partid, struct xpc_vars *vars)
+{
+ u64 old_mask, new_mask;
+
+ do {
+ old_mask = vars->heartbeating_to_mask;
+ new_mask = (old_mask & ~(1UL << partid));
+ } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) !=
+ old_mask);
+}
+
+
+/*
+ * The AMOs page consists of a number of AMO variables which are divided into
+ * four groups, The first two groups are used to identify an IRQ's sender.
+ * These two groups consist of 64 and 128 AMO variables respectively. The last
+ * two groups, consisting of just one AMO variable each, are used to identify
+ * the remote partitions that are currently engaged (from the viewpoint of
+ * the XPC running on the remote partition).
+ */
+#define XPC_NOTIFY_IRQ_AMOS 0
+#define XPC_ACTIVATE_IRQ_AMOS (XPC_NOTIFY_IRQ_AMOS + XP_MAX_PARTITIONS)
+#define XPC_ENGAGED_PARTITIONS_AMO (XPC_ACTIVATE_IRQ_AMOS + XP_NASID_MASK_WORDS)
+#define XPC_DISENGAGE_REQUEST_AMO (XPC_ENGAGED_PARTITIONS_AMO + 1)
+
+
+/*
+ * The following structure describes the per partition specific variables.
+ *
+ * An array of these structures, one per partition, will be defined. As a
+ * partition becomes active XPC will copy the array entry corresponding to
+ * itself from that partition. It is desirable that the size of this
+ * structure evenly divide into a cacheline, such that none of the entries
+ * in this array crosses a cacheline boundary. As it is now, each entry
+ * occupies half a cacheline.
+ */
+struct xpc_vars_part {
+ volatile u64 magic;
+
+ u64 openclose_args_pa; /* physical address of open and close args */
+ u64 GPs_pa; /* physical address of Get/Put values */
+
+ u64 IPI_amo_pa; /* physical address of IPI AMO_t structure */
+ int IPI_nasid; /* nasid of where to send IPIs */
+ int IPI_phys_cpuid; /* physical CPU ID of where to send IPIs */
+
+ u8 nchannels; /* #of defined channels supported */
+
+ u8 reserved[23]; /* pad to a full 64 bytes */
+};
+
+/*
+ * The vars_part MAGIC numbers play a part in the first contact protocol.
+ *
+ * MAGIC1 indicates that the per partition specific variables for a remote
+ * partition have been initialized by this partition.
+ *
+ * MAGIC2 indicates that this partition has pulled the remote partititions
+ * per partition variables that pertain to this partition.
+ */
+#define XPC_VP_MAGIC1 0x0053524156435058L /* 'XPCVARS\0'L (little endian) */
+#define XPC_VP_MAGIC2 0x0073726176435058L /* 'XPCvars\0'L (little endian) */
+
+
+/* the reserved page sizes and offsets */
+
+#define XPC_RP_HEADER_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page))
+#define XPC_RP_VARS_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_vars))
+
+#define XPC_RP_PART_NASIDS(_rp) (u64 *) ((u8 *) _rp + XPC_RP_HEADER_SIZE)
+#define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + xp_nasid_mask_words)
+#define XPC_RP_VARS(_rp) ((struct xpc_vars *) XPC_RP_MACH_NASIDS(_rp) + xp_nasid_mask_words)
+#define XPC_RP_VARS_PART(_rp) (struct xpc_vars_part *) ((u8 *) XPC_RP_VARS(rp) + XPC_RP_VARS_SIZE)
+
+
+/*
+ * Functions registered by add_timer() or called by kernel_thread() only
+ * allow for a single 64-bit argument. The following macros can be used to
+ * pack and unpack two (32-bit, 16-bit or 8-bit) arguments into or out from
+ * the passed argument.
+ */
+#define XPC_PACK_ARGS(_arg1, _arg2) \
+ ((((u64) _arg1) & 0xffffffff) | \
+ ((((u64) _arg2) & 0xffffffff) << 32))
+
+#define XPC_UNPACK_ARG1(_args) (((u64) _args) & 0xffffffff)
+#define XPC_UNPACK_ARG2(_args) ((((u64) _args) >> 32) & 0xffffffff)
+
+
+
+/*
+ * Define a Get/Put value pair (pointers) used with a message queue.
+ */
+struct xpc_gp {
+ volatile s64 get; /* Get value */
+ volatile s64 put; /* Put value */
+};
+
+#define XPC_GP_SIZE \
+ L1_CACHE_ALIGN(sizeof(struct xpc_gp) * XPC_NCHANNELS)
+
+
+
+/*
+ * Define a structure that contains arguments associated with opening and
+ * closing a channel.
+ */
+struct xpc_openclose_args {
+ u16 reason; /* reason why channel is closing */
+ u16 msg_size; /* sizeof each message entry */
+ u16 remote_nentries; /* #of message entries in remote msg queue */
+ u16 local_nentries; /* #of message entries in local msg queue */
+ u64 local_msgqueue_pa; /* physical address of local message queue */
+};
+
+#define XPC_OPENCLOSE_ARGS_SIZE \
+ L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * XPC_NCHANNELS)
+
+
+
+/* struct xpc_msg flags */
+
+#define XPC_M_DONE 0x01 /* msg has been received/consumed */
+#define XPC_M_READY 0x02 /* msg is ready to be sent */
+#define XPC_M_INTERRUPT 0x04 /* send interrupt when msg consumed */
+
+
+#define XPC_MSG_ADDRESS(_payload) \
+ ((struct xpc_msg *)((u8 *)(_payload) - XPC_MSG_PAYLOAD_OFFSET))
+
+
+
+/*
+ * Defines notify entry.
+ *
+ * This is used to notify a message's sender that their message was received
+ * and consumed by the intended recipient.
+ */
+struct xpc_notify {
+ volatile u8 type; /* type of notification */
+
+ /* the following two fields are only used if type == XPC_N_CALL */
+ xpc_notify_func func; /* user's notify function */
+ void *key; /* pointer to user's key */
+};
+
+/* struct xpc_notify type of notification */
+
+#define XPC_N_CALL 0x01 /* notify function provided by user */
+
+
+
+/*
+ * Define the structure that manages all the stuff required by a channel. In
+ * particular, they are used to manage the messages sent across the channel.
+ *
+ * This structure is private to a partition, and is NOT shared across the
+ * partition boundary.
+ *
+ * There is an array of these structures for each remote partition. It is
+ * allocated at the time a partition becomes active. The array contains one
+ * of these structures for each potential channel connection to that partition.
+ *
+ * Each of these structures manages two message queues (circular buffers).
+ * They are allocated at the time a channel connection is made. One of
+ * these message queues (local_msgqueue) holds the locally created messages
+ * that are destined for the remote partition. The other of these message
+ * queues (remote_msgqueue) is a locally cached copy of the remote partition's
+ * own local_msgqueue.
+ *
+ * The following is a description of the Get/Put pointers used to manage these
+ * two message queues. Consider the local_msgqueue to be on one partition
+ * and the remote_msgqueue to be its cached copy on another partition. A
+ * description of what each of the lettered areas contains is included.
+ *
+ *
+ * local_msgqueue remote_msgqueue
+ *
+ * |/////////| |/////////|
+ * w_remote_GP.get --> +---------+ |/////////|
+ * | F | |/////////|
+ * remote_GP.get --> +---------+ +---------+ <-- local_GP->get
+ * | | | |
+ * | | | E |
+ * | | | |
+ * | | +---------+ <-- w_local_GP.get
+ * | B | |/////////|
+ * | | |////D////|
+ * | | |/////////|
+ * | | +---------+ <-- w_remote_GP.put
+ * | | |////C////|
+ * local_GP->put --> +---------+ +---------+ <-- remote_GP.put
+ * | | |/////////|
+ * | A | |/////////|
+ * | | |/////////|
+ * w_local_GP.put --> +---------+ |/////////|
+ * |/////////| |/////////|
+ *
+ *
+ * ( remote_GP.[get|put] are cached copies of the remote
+ * partition's local_GP->[get|put], and thus their values can
+ * lag behind their counterparts on the remote partition. )
+ *
+ *
+ * A - Messages that have been allocated, but have not yet been sent to the
+ * remote partition.
+ *
+ * B - Messages that have been sent, but have not yet been acknowledged by the
+ * remote partition as having been received.
+ *
+ * C - Area that needs to be prepared for the copying of sent messages, by
+ * the clearing of the message flags of any previously received messages.
+ *
+ * D - Area into which sent messages are to be copied from the remote
+ * partition's local_msgqueue and then delivered to their intended
+ * recipients. [ To allow for a multi-message copy, another pointer
+ * (next_msg_to_pull) has been added to keep track of the next message
+ * number needing to be copied (pulled). It chases after w_remote_GP.put.
+ * Any messages lying between w_local_GP.get and next_msg_to_pull have
+ * been copied and are ready to be delivered. ]
+ *
+ * E - Messages that have been copied and delivered, but have not yet been
+ * acknowledged by the recipient as having been received.
+ *
+ * F - Messages that have been acknowledged, but XPC has not yet notified the
+ * sender that the message was received by its intended recipient.
+ * This is also an area that needs to be prepared for the allocating of
+ * new messages, by the clearing of the message flags of the acknowledged
+ * messages.
+ */
+struct xpc_channel {
+ partid_t partid; /* ID of remote partition connected */
+ spinlock_t lock; /* lock for updating this structure */
+ u32 flags; /* general flags */
+
+ enum xpc_retval reason; /* reason why channel is disconnect'g */
+ int reason_line; /* line# disconnect initiated from */
+
+ u16 number; /* channel # */
+
+ u16 msg_size; /* sizeof each msg entry */
+ u16 local_nentries; /* #of msg entries in local msg queue */
+ u16 remote_nentries; /* #of msg entries in remote msg queue*/
+
+ void *local_msgqueue_base; /* base address of kmalloc'd space */
+ struct xpc_msg *local_msgqueue; /* local message queue */
+ void *remote_msgqueue_base; /* base address of kmalloc'd space */
+ struct xpc_msg *remote_msgqueue;/* cached copy of remote partition's */
+ /* local message queue */
+ u64 remote_msgqueue_pa; /* phys addr of remote partition's */
+ /* local message queue */
+
+ atomic_t references; /* #of external references to queues */
+
+ atomic_t n_on_msg_allocate_wq; /* #on msg allocation wait queue */
+ wait_queue_head_t msg_allocate_wq; /* msg allocation wait queue */
+
+ u8 delayed_IPI_flags; /* IPI flags received, but delayed */
+ /* action until channel disconnected */
+
+ /* queue of msg senders who want to be notified when msg received */
+
+ atomic_t n_to_notify; /* #of msg senders to notify */
+ struct xpc_notify *notify_queue;/* notify queue for messages sent */
+
+ xpc_channel_func func; /* user's channel function */
+ void *key; /* pointer to user's key */
+
+ struct mutex msg_to_pull_mutex; /* next msg to pull serialization */
+ struct completion wdisconnect_wait; /* wait for channel disconnect */
+
+ struct xpc_openclose_args *local_openclose_args; /* args passed on */
+ /* opening or closing of channel */
+
+ /* various flavors of local and remote Get/Put values */
+
+ struct xpc_gp *local_GP; /* local Get/Put values */
+ struct xpc_gp remote_GP; /* remote Get/Put values */
+ struct xpc_gp w_local_GP; /* working local Get/Put values */
+ struct xpc_gp w_remote_GP; /* working remote Get/Put values */
+ s64 next_msg_to_pull; /* Put value of next msg to pull */
+
+ /* kthread management related fields */
+
+// >>> rethink having kthreads_assigned_limit and kthreads_idle_limit; perhaps
+// >>> allow the assigned limit be unbounded and let the idle limit be dynamic
+// >>> dependent on activity over the last interval of time
+ atomic_t kthreads_assigned; /* #of kthreads assigned to channel */
+ u32 kthreads_assigned_limit; /* limit on #of kthreads assigned */
+ atomic_t kthreads_idle; /* #of kthreads idle waiting for work */
+ u32 kthreads_idle_limit; /* limit on #of kthreads idle */
+ atomic_t kthreads_active; /* #of kthreads actively working */
+ // >>> following field is temporary
+ u32 kthreads_created; /* total #of kthreads created */
+
+ wait_queue_head_t idle_wq; /* idle kthread wait queue */
+
+} ____cacheline_aligned;
+
+
+/* struct xpc_channel flags */
+
+#define XPC_C_WASCONNECTED 0x00000001 /* channel was connected */
+
+#define XPC_C_ROPENREPLY 0x00000002 /* remote open channel reply */
+#define XPC_C_OPENREPLY 0x00000004 /* local open channel reply */
+#define XPC_C_ROPENREQUEST 0x00000008 /* remote open channel request */
+#define XPC_C_OPENREQUEST 0x00000010 /* local open channel request */
+
+#define XPC_C_SETUP 0x00000020 /* channel's msgqueues are alloc'd */
+#define XPC_C_CONNECTEDCALLOUT 0x00000040 /* connected callout initiated */
+#define XPC_C_CONNECTEDCALLOUT_MADE \
+ 0x00000080 /* connected callout completed */
+#define XPC_C_CONNECTED 0x00000100 /* local channel is connected */
+#define XPC_C_CONNECTING 0x00000200 /* channel is being connected */
+
+#define XPC_C_RCLOSEREPLY 0x00000400 /* remote close channel reply */
+#define XPC_C_CLOSEREPLY 0x00000800 /* local close channel reply */
+#define XPC_C_RCLOSEREQUEST 0x00001000 /* remote close channel request */
+#define XPC_C_CLOSEREQUEST 0x00002000 /* local close channel request */
+
+#define XPC_C_DISCONNECTED 0x00004000 /* channel is disconnected */
+#define XPC_C_DISCONNECTING 0x00008000 /* channel is being disconnected */
+#define XPC_C_DISCONNECTINGCALLOUT \
+ 0x00010000 /* disconnecting callout initiated */
+#define XPC_C_DISCONNECTINGCALLOUT_MADE \
+ 0x00020000 /* disconnecting callout completed */
+#define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */
+
+
+
+/*
+ * Manages channels on a partition basis. There is one of these structures
+ * for each partition (a partition will never utilize the structure that
+ * represents itself).
+ */
+struct xpc_partition {
+
+ /* XPC HB infrastructure */
+
+ u8 remote_rp_version; /* version# of partition's rsvd pg */
+ struct timespec remote_rp_stamp;/* time when rsvd pg was initialized */
+ u64 remote_rp_pa; /* phys addr of partition's rsvd pg */
+ u64 remote_vars_pa; /* phys addr of partition's vars */
+ u64 remote_vars_part_pa; /* phys addr of partition's vars part */
+ u64 last_heartbeat; /* HB at last read */
+ u64 remote_amos_page_pa; /* phys addr of partition's amos page */
+ int remote_act_nasid; /* active part's act/deact nasid */
+ int remote_act_phys_cpuid; /* active part's act/deact phys cpuid */
+ u32 act_IRQ_rcvd; /* IRQs since activation */
+ spinlock_t act_lock; /* protect updating of act_state */
+ u8 act_state; /* from XPC HB viewpoint */
+ u8 remote_vars_version; /* version# of partition's vars */
+ enum xpc_retval reason; /* reason partition is deactivating */
+ int reason_line; /* line# deactivation initiated from */
+ int reactivate_nasid; /* nasid in partition to reactivate */
+
+ unsigned long disengage_request_timeout; /* timeout in jiffies */
+ struct timer_list disengage_request_timer;
+
+
+ /* XPC infrastructure referencing and teardown control */
+
+ volatile u8 setup_state; /* infrastructure setup state */
+ wait_queue_head_t teardown_wq; /* kthread waiting to teardown infra */
+ atomic_t references; /* #of references to infrastructure */
+
+
+ /*
+ * NONE OF THE PRECEDING FIELDS OF THIS STRUCTURE WILL BE CLEARED WHEN
+ * XPC SETS UP THE NECESSARY INFRASTRUCTURE TO SUPPORT CROSS PARTITION
+ * COMMUNICATION. ALL OF THE FOLLOWING FIELDS WILL BE CLEARED. (THE
+ * 'nchannels' FIELD MUST BE THE FIRST OF THE FIELDS TO BE CLEARED.)
+ */
+
+
+ u8 nchannels; /* #of defined channels supported */
+ atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */
+ atomic_t nchannels_engaged;/* #of channels engaged with remote part */
+ struct xpc_channel *channels;/* array of channel structures */
+
+ void *local_GPs_base; /* base address of kmalloc'd space */
+ struct xpc_gp *local_GPs; /* local Get/Put values */
+ void *remote_GPs_base; /* base address of kmalloc'd space */
+ struct xpc_gp *remote_GPs;/* copy of remote partition's local Get/Put */
+ /* values */
+ u64 remote_GPs_pa; /* phys address of remote partition's local */
+ /* Get/Put values */
+
+
+ /* fields used to pass args when opening or closing a channel */
+
+ void *local_openclose_args_base; /* base address of kmalloc'd space */
+ struct xpc_openclose_args *local_openclose_args; /* local's args */
+ void *remote_openclose_args_base; /* base address of kmalloc'd space */
+ struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */
+ /* args */
+ u64 remote_openclose_args_pa; /* phys addr of remote's args */
+
+
+ /* IPI sending, receiving and handling related fields */
+
+ int remote_IPI_nasid; /* nasid of where to send IPIs */
+ int remote_IPI_phys_cpuid; /* phys CPU ID of where to send IPIs */
+ AMO_t *remote_IPI_amo_va; /* address of remote IPI AMO_t structure */
+
+ AMO_t *local_IPI_amo_va; /* address of IPI AMO_t structure */
+ u64 local_IPI_amo; /* IPI amo flags yet to be handled */
+ char IPI_owner[8]; /* IPI owner's name */
+ struct timer_list dropped_IPI_timer; /* dropped IPI timer */
+
+ spinlock_t IPI_lock; /* IPI handler lock */
+
+
+ /* channel manager related fields */
+
+ atomic_t channel_mgr_requests; /* #of requests to activate chan mgr */
+ wait_queue_head_t channel_mgr_wq; /* channel mgr's wait queue */
+
+} ____cacheline_aligned;
+
+
+/* struct xpc_partition act_state values (for XPC HB) */
+
+#define XPC_P_INACTIVE 0x00 /* partition is not active */
+#define XPC_P_ACTIVATION_REQ 0x01 /* created thread to activate */
+#define XPC_P_ACTIVATING 0x02 /* activation thread started */
+#define XPC_P_ACTIVE 0x03 /* xpc_partition_up() was called */
+#define XPC_P_DEACTIVATING 0x04 /* partition deactivation initiated */
+
+
+#define XPC_DEACTIVATE_PARTITION(_p, _reason) \
+ xpc_deactivate_partition(__LINE__, (_p), (_reason))
+
+
+/* struct xpc_partition setup_state values */
+
+#define XPC_P_UNSET 0x00 /* infrastructure was never setup */
+#define XPC_P_SETUP 0x01 /* infrastructure is setup */
+#define XPC_P_WTEARDOWN 0x02 /* waiting to teardown infrastructure */
+#define XPC_P_TORNDOWN 0x03 /* infrastructure is torndown */
+
+
+
+/*
+ * struct xpc_partition IPI_timer #of seconds to wait before checking for
+ * dropped IPIs. These occur whenever an IPI amo write doesn't complete until
+ * after the IPI was received.
+ */
+#define XPC_P_DROPPED_IPI_WAIT (0.25 * HZ)
+
+
+/* number of seconds to wait for other partitions to disengage */
+#define XPC_DISENGAGE_REQUEST_DEFAULT_TIMELIMIT 90
+
+/* interval in seconds to print 'waiting disengagement' messages */
+#define XPC_DISENGAGE_PRINTMSG_INTERVAL 10
+
+
+#define XPC_PARTID(_p) ((partid_t) ((_p) - &xpc_partitions[0]))
+
+
+
+/* found in xp_main.c */
+extern struct xpc_registration xpc_registrations[];
+
+
+/* found in xpc_main.c */
+extern struct device *xpc_part;
+extern struct device *xpc_chan;
+extern int xpc_disengage_request_timelimit;
+extern int xpc_disengage_request_timedout;
+extern irqreturn_t xpc_notify_IRQ_handler(int, void *);
+extern void xpc_dropped_IPI_check(struct xpc_partition *);
+extern void xpc_activate_partition(struct xpc_partition *);
+extern void xpc_activate_kthreads(struct xpc_channel *, int);
+extern void xpc_create_kthreads(struct xpc_channel *, int, int);
+extern void xpc_disconnect_wait(int);
+
+
+/* found in xpc_partition.c */
+extern int xpc_exiting;
+extern struct xpc_vars *xpc_vars;
+extern struct xpc_rsvd_page *xpc_rsvd_page;
+extern struct xpc_vars_part *xpc_vars_part;
+extern struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1];
+extern char *xpc_remote_copy_buffer;
+extern void *xpc_remote_copy_buffer_base;
+extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **);
+extern struct xpc_rsvd_page *xpc_rsvd_page_init(void);
+extern void xpc_allow_IPI_ops(void);
+extern void xpc_restrict_IPI_ops(void);
+extern int xpc_identify_act_IRQ_sender(void);
+extern int xpc_partition_disengaged(struct xpc_partition *);
+extern enum xpc_retval xpc_mark_partition_active(struct xpc_partition *);
+extern void xpc_mark_partition_inactive(struct xpc_partition *);
+extern void xpc_discovery(void);
+extern void xpc_check_remote_hb(void);
+extern void xpc_deactivate_partition(const int, struct xpc_partition *,
+ enum xpc_retval);
+extern enum xpc_retval xpc_initiate_partid_to_nasids(partid_t, void *);
+
+
+/* found in xpc_channel.c */
+extern void xpc_initiate_connect(int);
+extern void xpc_initiate_disconnect(int);
+extern enum xpc_retval xpc_initiate_allocate(partid_t, int, u32, void **);
+extern enum xpc_retval xpc_initiate_send(partid_t, int, void *);
+extern enum xpc_retval xpc_initiate_send_notify(partid_t, int, void *,
+ xpc_notify_func, void *);
+extern void xpc_initiate_received(partid_t, int, void *);
+extern enum xpc_retval xpc_setup_infrastructure(struct xpc_partition *);
+extern enum xpc_retval xpc_pull_remote_vars_part(struct xpc_partition *);
+extern void xpc_process_channel_activity(struct xpc_partition *);
+extern void xpc_connected_callout(struct xpc_channel *);
+extern void xpc_deliver_msg(struct xpc_channel *);
+extern void xpc_disconnect_channel(const int, struct xpc_channel *,
+ enum xpc_retval, unsigned long *);
+extern void xpc_disconnect_callout(struct xpc_channel *, enum xpc_retval);
+extern void xpc_partition_going_down(struct xpc_partition *, enum xpc_retval);
+extern void xpc_teardown_infrastructure(struct xpc_partition *);
+
+
+
+static inline void
+xpc_wakeup_channel_mgr(struct xpc_partition *part)
+{
+ if (atomic_inc_return(&part->channel_mgr_requests) == 1) {
+ wake_up(&part->channel_mgr_wq);
+ }
+}
+
+
+
+/*
+ * These next two inlines are used to keep us from tearing down a channel's
+ * msg queues while a thread may be referencing them.
+ */
+static inline void
+xpc_msgqueue_ref(struct xpc_channel *ch)
+{
+ atomic_inc(&ch->references);
+}
+
+static inline void
+xpc_msgqueue_deref(struct xpc_channel *ch)
+{
+ s32 refs = atomic_dec_return(&ch->references);
+
+ DBUG_ON(refs < 0);
+ if (refs == 0) {
+ xpc_wakeup_channel_mgr(&xpc_partitions[ch->partid]);
+ }
+}
+
+
+
+#define XPC_DISCONNECT_CHANNEL(_ch, _reason, _irqflgs) \
+ xpc_disconnect_channel(__LINE__, _ch, _reason, _irqflgs)
+
+
+/*
+ * These two inlines are used to keep us from tearing down a partition's
+ * setup infrastructure while a thread may be referencing it.
+ */
+static inline void
+xpc_part_deref(struct xpc_partition *part)
+{
+ s32 refs = atomic_dec_return(&part->references);
+
+
+ DBUG_ON(refs < 0);
+ if (refs == 0 && part->setup_state == XPC_P_WTEARDOWN) {
+ wake_up(&part->teardown_wq);
+ }
+}
+
+static inline int
+xpc_part_ref(struct xpc_partition *part)
+{
+ int setup;
+
+
+ atomic_inc(&part->references);
+ setup = (part->setup_state == XPC_P_SETUP);
+ if (!setup) {
+ xpc_part_deref(part);
+ }
+ return setup;
+}
+
+
+
+/*
+ * The following macro is to be used for the setting of the reason and
+ * reason_line fields in both the struct xpc_channel and struct xpc_partition
+ * structures.
+ */
+#define XPC_SET_REASON(_p, _reason, _line) \
+ { \
+ (_p)->reason = _reason; \
+ (_p)->reason_line = _line; \
+ }
+
+
+
+/*
+ * This next set of inlines are used to keep track of when a partition is
+ * potentially engaged in accessing memory belonging to another partition.
+ */
+
+static inline void
+xpc_mark_partition_engaged(struct xpc_partition *part)
+{
+ unsigned long irq_flags;
+ AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa +
+ (XPC_ENGAGED_PARTITIONS_AMO * sizeof(AMO_t)));
+
+
+ local_irq_save(irq_flags);
+
+ /* set bit corresponding to our partid in remote partition's AMO */
+ FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_OR,
+ (1UL << sn_partition_id));
+ /*
+ * We must always use the nofault function regardless of whether we
+ * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
+ * didn't, we'd never know that the other partition is down and would
+ * keep sending IPIs and AMOs to it until the heartbeat times out.
+ */
+ (void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->
+ variable), xp_nofault_PIOR_target));
+
+ local_irq_restore(irq_flags);
+}
+
+static inline void
+xpc_mark_partition_disengaged(struct xpc_partition *part)
+{
+ unsigned long irq_flags;
+ AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa +
+ (XPC_ENGAGED_PARTITIONS_AMO * sizeof(AMO_t)));
+
+
+ local_irq_save(irq_flags);
+
+ /* clear bit corresponding to our partid in remote partition's AMO */
+ FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND,
+ ~(1UL << sn_partition_id));
+ /*
+ * We must always use the nofault function regardless of whether we
+ * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
+ * didn't, we'd never know that the other partition is down and would
+ * keep sending IPIs and AMOs to it until the heartbeat times out.
+ */
+ (void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->
+ variable), xp_nofault_PIOR_target));
+
+ local_irq_restore(irq_flags);
+}
+
+static inline void
+xpc_request_partition_disengage(struct xpc_partition *part)
+{
+ unsigned long irq_flags;
+ AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa +
+ (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t)));
+
+
+ local_irq_save(irq_flags);
+
+ /* set bit corresponding to our partid in remote partition's AMO */
+ FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_OR,
+ (1UL << sn_partition_id));
+ /*
+ * We must always use the nofault function regardless of whether we
+ * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
+ * didn't, we'd never know that the other partition is down and would
+ * keep sending IPIs and AMOs to it until the heartbeat times out.
+ */
+ (void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->
+ variable), xp_nofault_PIOR_target));
+
+ local_irq_restore(irq_flags);
+}
+
+static inline void
+xpc_cancel_partition_disengage_request(struct xpc_partition *part)
+{
+ unsigned long irq_flags;
+ AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa +
+ (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t)));
+
+
+ local_irq_save(irq_flags);
+
+ /* clear bit corresponding to our partid in remote partition's AMO */
+ FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND,
+ ~(1UL << sn_partition_id));
+ /*
+ * We must always use the nofault function regardless of whether we
+ * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
+ * didn't, we'd never know that the other partition is down and would
+ * keep sending IPIs and AMOs to it until the heartbeat times out.
+ */
+ (void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->
+ variable), xp_nofault_PIOR_target));
+
+ local_irq_restore(irq_flags);
+}
+
+static inline u64
+xpc_partition_engaged(u64 partid_mask)
+{
+ AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO;
+
+
+ /* return our partition's AMO variable ANDed with partid_mask */
+ return (FETCHOP_LOAD_OP(TO_AMO((u64) &amo->variable), FETCHOP_LOAD) &
+ partid_mask);
+}
+
+static inline u64
+xpc_partition_disengage_requested(u64 partid_mask)
+{
+ AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO;
+
+
+ /* return our partition's AMO variable ANDed with partid_mask */
+ return (FETCHOP_LOAD_OP(TO_AMO((u64) &amo->variable), FETCHOP_LOAD) &
+ partid_mask);
+}
+
+static inline void
+xpc_clear_partition_engaged(u64 partid_mask)
+{
+ AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO;
+
+
+ /* clear bit(s) based on partid_mask in our partition's AMO */
+ FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND,
+ ~partid_mask);
+}
+
+static inline void
+xpc_clear_partition_disengage_request(u64 partid_mask)
+{
+ AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO;
+
+
+ /* clear bit(s) based on partid_mask in our partition's AMO */
+ FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND,
+ ~partid_mask);
+}
+
+
+
+/*
+ * The following set of macros and inlines are used for the sending and
+ * receiving of IPIs (also known as IRQs). There are two flavors of IPIs,
+ * one that is associated with partition activity (SGI_XPC_ACTIVATE) and
+ * the other that is associated with channel activity (SGI_XPC_NOTIFY).
+ */
+
+static inline u64
+xpc_IPI_receive(AMO_t *amo)
+{
+ return FETCHOP_LOAD_OP(TO_AMO((u64) &amo->variable), FETCHOP_CLEAR);
+}
+
+
+static inline enum xpc_retval
+xpc_IPI_send(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector)
+{
+ int ret = 0;
+ unsigned long irq_flags;
+
+
+ local_irq_save(irq_flags);
+
+ FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_OR, flag);
+ sn_send_IPI_phys(nasid, phys_cpuid, vector, 0);
+
+ /*
+ * We must always use the nofault function regardless of whether we
+ * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
+ * didn't, we'd never know that the other partition is down and would
+ * keep sending IPIs and AMOs to it until the heartbeat times out.
+ */
+ ret = xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->variable),
+ xp_nofault_PIOR_target));
+
+ local_irq_restore(irq_flags);
+
+ return ((ret == 0) ? xpcSuccess : xpcPioReadError);
+}
+
+
+/*
+ * IPIs associated with SGI_XPC_ACTIVATE IRQ.
+ */
+
+/*
+ * Flag the appropriate AMO variable and send an IPI to the specified node.
+ */
+static inline void
+xpc_activate_IRQ_send(u64 amos_page_pa, int from_nasid, int to_nasid,
+ int to_phys_cpuid)
+{
+ int w_index = XPC_NASID_W_INDEX(from_nasid);
+ int b_index = XPC_NASID_B_INDEX(from_nasid);
+ AMO_t *amos = (AMO_t *) __va(amos_page_pa +
+ (XPC_ACTIVATE_IRQ_AMOS * sizeof(AMO_t)));
+
+
+ (void) xpc_IPI_send(&amos[w_index], (1UL << b_index), to_nasid,
+ to_phys_cpuid, SGI_XPC_ACTIVATE);
+}
+
+static inline void
+xpc_IPI_send_activate(struct xpc_vars *vars)
+{
+ xpc_activate_IRQ_send(vars->amos_page_pa, cnodeid_to_nasid(0),
+ vars->act_nasid, vars->act_phys_cpuid);
+}
+
+static inline void
+xpc_IPI_send_activated(struct xpc_partition *part)
+{
+ xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0),
+ part->remote_act_nasid, part->remote_act_phys_cpuid);
+}
+
+static inline void
+xpc_IPI_send_reactivate(struct xpc_partition *part)
+{
+ xpc_activate_IRQ_send(xpc_vars->amos_page_pa, part->reactivate_nasid,
+ xpc_vars->act_nasid, xpc_vars->act_phys_cpuid);
+}
+
+static inline void
+xpc_IPI_send_disengage(struct xpc_partition *part)
+{
+ xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0),
+ part->remote_act_nasid, part->remote_act_phys_cpuid);
+}
+
+
+/*
+ * IPIs associated with SGI_XPC_NOTIFY IRQ.
+ */
+
+/*
+ * Send an IPI to the remote partition that is associated with the
+ * specified channel.
+ */
+#define XPC_NOTIFY_IRQ_SEND(_ch, _ipi_f, _irq_f) \
+ xpc_notify_IRQ_send(_ch, _ipi_f, #_ipi_f, _irq_f)
+
+static inline void
+xpc_notify_IRQ_send(struct xpc_channel *ch, u8 ipi_flag, char *ipi_flag_string,
+ unsigned long *irq_flags)
+{
+ struct xpc_partition *part = &xpc_partitions[ch->partid];
+ enum xpc_retval ret;
+
+
+ if (likely(part->act_state != XPC_P_DEACTIVATING)) {
+ ret = xpc_IPI_send(part->remote_IPI_amo_va,
+ (u64) ipi_flag << (ch->number * 8),
+ part->remote_IPI_nasid,
+ part->remote_IPI_phys_cpuid,
+ SGI_XPC_NOTIFY);
+ dev_dbg(xpc_chan, "%s sent to partid=%d, channel=%d, ret=%d\n",
+ ipi_flag_string, ch->partid, ch->number, ret);
+ if (unlikely(ret != xpcSuccess)) {
+ if (irq_flags != NULL) {
+ spin_unlock_irqrestore(&ch->lock, *irq_flags);
+ }
+ XPC_DEACTIVATE_PARTITION(part, ret);
+ if (irq_flags != NULL) {
+ spin_lock_irqsave(&ch->lock, *irq_flags);
+ }
+ }
+ }
+}
+
+
+/*
+ * Make it look like the remote partition, which is associated with the
+ * specified channel, sent us an IPI. This faked IPI will be handled
+ * by xpc_dropped_IPI_check().
+ */
+#define XPC_NOTIFY_IRQ_SEND_LOCAL(_ch, _ipi_f) \
+ xpc_notify_IRQ_send_local(_ch, _ipi_f, #_ipi_f)
+
+static inline void
+xpc_notify_IRQ_send_local(struct xpc_channel *ch, u8 ipi_flag,
+ char *ipi_flag_string)
+{
+ struct xpc_partition *part = &xpc_partitions[ch->partid];
+
+
+ FETCHOP_STORE_OP(TO_AMO((u64) &part->local_IPI_amo_va->variable),
+ FETCHOP_OR, ((u64) ipi_flag << (ch->number * 8)));
+ dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n",
+ ipi_flag_string, ch->partid, ch->number);
+}
+
+
+/*
+ * The sending and receiving of IPIs includes the setting of an AMO variable
+ * to indicate the reason the IPI was sent. The 64-bit variable is divided
+ * up into eight bytes, ordered from right to left. Byte zero pertains to
+ * channel 0, byte one to channel 1, and so on. Each byte is described by
+ * the following IPI flags.
+ */
+
+#define XPC_IPI_CLOSEREQUEST 0x01
+#define XPC_IPI_CLOSEREPLY 0x02
+#define XPC_IPI_OPENREQUEST 0x04
+#define XPC_IPI_OPENREPLY 0x08
+#define XPC_IPI_MSGREQUEST 0x10
+
+
+/* given an AMO variable and a channel#, get its associated IPI flags */
+#define XPC_GET_IPI_FLAGS(_amo, _c) ((u8) (((_amo) >> ((_c) * 8)) & 0xff))
+#define XPC_SET_IPI_FLAGS(_amo, _c, _f) (_amo) |= ((u64) (_f) << ((_c) * 8))
+
+#define XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(_amo) ((_amo) & __IA64_UL_CONST(0x0f0f0f0f0f0f0f0f))
+#define XPC_ANY_MSG_IPI_FLAGS_SET(_amo) ((_amo) & __IA64_UL_CONST(0x1010101010101010))
+
+
+static inline void
+xpc_IPI_send_closerequest(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+ struct xpc_openclose_args *args = ch->local_openclose_args;
+
+
+ args->reason = ch->reason;
+
+ XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREQUEST, irq_flags);
+}
+
+static inline void
+xpc_IPI_send_closereply(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+ XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREPLY, irq_flags);
+}
+
+static inline void
+xpc_IPI_send_openrequest(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+ struct xpc_openclose_args *args = ch->local_openclose_args;
+
+
+ args->msg_size = ch->msg_size;
+ args->local_nentries = ch->local_nentries;
+
+ XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREQUEST, irq_flags);
+}
+
+static inline void
+xpc_IPI_send_openreply(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+ struct xpc_openclose_args *args = ch->local_openclose_args;
+
+
+ args->remote_nentries = ch->remote_nentries;
+ args->local_nentries = ch->local_nentries;
+ args->local_msgqueue_pa = __pa(ch->local_msgqueue);
+
+ XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREPLY, irq_flags);
+}
+
+static inline void
+xpc_IPI_send_msgrequest(struct xpc_channel *ch)
+{
+ XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_MSGREQUEST, NULL);
+}
+
+static inline void
+xpc_IPI_send_local_msgrequest(struct xpc_channel *ch)
+{
+ XPC_NOTIFY_IRQ_SEND_LOCAL(ch, XPC_IPI_MSGREQUEST);
+}
+
+
+/*
+ * Memory for XPC's AMO variables is allocated by the MSPEC driver. These
+ * pages are located in the lowest granule. The lowest granule uses 4k pages
+ * for cached references and an alternate TLB handler to never provide a
+ * cacheable mapping for the entire region. This will prevent speculative
+ * reading of cached copies of our lines from being issued which will cause
+ * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64
+ * AMO variables (based on XP_MAX_PARTITIONS) for message notification and an
+ * additional 128 AMO variables (based on XP_NASID_MASK_WORDS) for partition
+ * activation and 2 AMO variables for partition deactivation.
+ */
+static inline AMO_t *
+xpc_IPI_init(int index)
+{
+ AMO_t *amo = xpc_vars->amos_page + index;
+
+
+ (void) xpc_IPI_receive(amo); /* clear AMO variable */
+ return amo;
+}
+
+
+
+static inline enum xpc_retval
+xpc_map_bte_errors(bte_result_t error)
+{
+ if (error == BTE_SUCCESS)
+ return xpcSuccess;
+
+ if (is_shub2()) {
+ if (BTE_VALID_SH2_ERROR(error))
+ return xpcBteSh2Start + error;
+ return xpcBteUnmappedError;
+ }
+ switch (error) {
+ case BTE_SUCCESS: return xpcSuccess;
+ case BTEFAIL_DIR: return xpcBteDirectoryError;
+ case BTEFAIL_POISON: return xpcBtePoisonError;
+ case BTEFAIL_WERR: return xpcBteWriteError;
+ case BTEFAIL_ACCESS: return xpcBteAccessError;
+ case BTEFAIL_PWERR: return xpcBtePWriteError;
+ case BTEFAIL_PRERR: return xpcBtePReadError;
+ case BTEFAIL_TOUT: return xpcBteTimeOutError;
+ case BTEFAIL_XTERR: return xpcBteXtalkError;
+ case BTEFAIL_NOTAVAIL: return xpcBteNotAvailable;
+ default: return xpcBteUnmappedError;
+ }
+}
+
+
+
+/*
+ * Check to see if there is any channel activity to/from the specified
+ * partition.
+ */
+static inline void
+xpc_check_for_channel_activity(struct xpc_partition *part)
+{
+ u64 IPI_amo;
+ unsigned long irq_flags;
+
+
+ IPI_amo = xpc_IPI_receive(part->local_IPI_amo_va);
+ if (IPI_amo == 0) {
+ return;
+ }
+
+ spin_lock_irqsave(&part->IPI_lock, irq_flags);
+ part->local_IPI_amo |= IPI_amo;
+ spin_unlock_irqrestore(&part->IPI_lock, irq_flags);
+
+ dev_dbg(xpc_chan, "received IPI from partid=%d, IPI_amo=0x%lx\n",
+ XPC_PARTID(part), IPI_amo);
+
+ xpc_wakeup_channel_mgr(part);
+}
+
+
+#endif /* _DRIVERS_MISC_SGIXP_XPC_H */
+
--- /dev/null
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
+ */
+
+
+/*
+ * Cross Partition Communication (XPC) channel support.
+ *
+ * This is the part of XPC that manages the channels and
+ * sends/receives messages across them to/from other partitions.
+ *
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/cache.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/completion.h>
+#include <asm/sn/bte.h>
+#include <asm/sn/sn_sal.h>
+#include "xpc.h"
+
+
+/*
+ * Guarantee that the kzalloc'd memory is cacheline aligned.
+ */
+static void *
+xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
+{
+ /* see if kzalloc will give us cachline aligned memory by default */
+ *base = kzalloc(size, flags);
+ if (*base == NULL) {
+ return NULL;
+ }
+ if ((u64) *base == L1_CACHE_ALIGN((u64) *base)) {
+ return *base;
+ }
+ kfree(*base);
+
+ /* nope, we'll have to do it ourselves */
+ *base = kzalloc(size + L1_CACHE_BYTES, flags);
+ if (*base == NULL) {
+ return NULL;
+ }
+ return (void *) L1_CACHE_ALIGN((u64) *base);
+}
+
+
+/*
+ * Set up the initial values for the XPartition Communication channels.
+ */
+static void
+xpc_initialize_channels(struct xpc_partition *part, partid_t partid)
+{
+ int ch_number;
+ struct xpc_channel *ch;
+
+
+ for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
+ ch = &part->channels[ch_number];
+
+ ch->partid = partid;
+ ch->number = ch_number;
+ ch->flags = XPC_C_DISCONNECTED;
+
+ ch->local_GP = &part->local_GPs[ch_number];
+ ch->local_openclose_args =
+ &part->local_openclose_args[ch_number];
+
+ atomic_set(&ch->kthreads_assigned, 0);
+ atomic_set(&ch->kthreads_idle, 0);
+ atomic_set(&ch->kthreads_active, 0);
+
+ atomic_set(&ch->references, 0);
+ atomic_set(&ch->n_to_notify, 0);
+
+ spin_lock_init(&ch->lock);
+ mutex_init(&ch->msg_to_pull_mutex);
+ init_completion(&ch->wdisconnect_wait);
+
+ atomic_set(&ch->n_on_msg_allocate_wq, 0);
+ init_waitqueue_head(&ch->msg_allocate_wq);
+ init_waitqueue_head(&ch->idle_wq);
+ }
+}
+
+
+/*
+ * Setup the infrastructure necessary to support XPartition Communication
+ * between the specified remote partition and the local one.
+ */
+enum xpc_retval
+xpc_setup_infrastructure(struct xpc_partition *part)
+{
+ int ret, cpuid;
+ struct timer_list *timer;
+ partid_t partid = XPC_PARTID(part);
+
+
+ /*
+ * Zero out MOST of the entry for this partition. Only the fields
+ * starting with `nchannels' will be zeroed. The preceding fields must
+ * remain `viable' across partition ups and downs, since they may be
+ * referenced during this memset() operation.
+ */
+ memset(&part->nchannels, 0, sizeof(struct xpc_partition) -
+ offsetof(struct xpc_partition, nchannels));
+
+ /*
+ * Allocate all of the channel structures as a contiguous chunk of
+ * memory.
+ */
+ part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_NCHANNELS,
+ GFP_KERNEL);
+ if (part->channels == NULL) {
+ dev_err(xpc_chan, "can't get memory for channels\n");
+ return xpcNoMemory;
+ }
+
+ part->nchannels = XPC_NCHANNELS;
+
+
+ /* allocate all the required GET/PUT values */
+
+ part->local_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE,
+ GFP_KERNEL, &part->local_GPs_base);
+ if (part->local_GPs == NULL) {
+ kfree(part->channels);
+ part->channels = NULL;
+ dev_err(xpc_chan, "can't get memory for local get/put "
+ "values\n");
+ return xpcNoMemory;
+ }
+
+ part->remote_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE,
+ GFP_KERNEL, &part->remote_GPs_base);
+ if (part->remote_GPs == NULL) {
+ dev_err(xpc_chan, "can't get memory for remote get/put "
+ "values\n");
+ kfree(part->local_GPs_base);
+ part->local_GPs = NULL;
+ kfree(part->channels);
+ part->channels = NULL;
+ return xpcNoMemory;
+ }
+
+
+ /* allocate all the required open and close args */
+
+ part->local_openclose_args = xpc_kzalloc_cacheline_aligned(
+ XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
+ &part->local_openclose_args_base);
+ if (part->local_openclose_args == NULL) {
+ dev_err(xpc_chan, "can't get memory for local connect args\n");
+ kfree(part->remote_GPs_base);
+ part->remote_GPs = NULL;
+ kfree(part->local_GPs_base);
+ part->local_GPs = NULL;
+ kfree(part->channels);
+ part->channels = NULL;
+ return xpcNoMemory;
+ }
+
+ part->remote_openclose_args = xpc_kzalloc_cacheline_aligned(
+ XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
+ &part->remote_openclose_args_base);
+ if (part->remote_openclose_args == NULL) {
+ dev_err(xpc_chan, "can't get memory for remote connect args\n");
+ kfree(part->local_openclose_args_base);
+ part->local_openclose_args = NULL;
+ kfree(part->remote_GPs_base);
+ part->remote_GPs = NULL;
+ kfree(part->local_GPs_base);
+ part->local_GPs = NULL;
+ kfree(part->channels);
+ part->channels = NULL;
+ return xpcNoMemory;
+ }
+
+
+ xpc_initialize_channels(part, partid);
+
+ atomic_set(&part->nchannels_active, 0);
+ atomic_set(&part->nchannels_engaged, 0);
+
+
+ /* local_IPI_amo were set to 0 by an earlier memset() */
+
+ /* Initialize this partitions AMO_t structure */
+ part->local_IPI_amo_va = xpc_IPI_init(partid);
+
+ spin_lock_init(&part->IPI_lock);
+
+ atomic_set(&part->channel_mgr_requests, 1);
+ init_waitqueue_head(&part->channel_mgr_wq);
+
+ sprintf(part->IPI_owner, "xpc%02d", partid);
+ ret = request_irq(SGI_XPC_NOTIFY, xpc_notify_IRQ_handler, IRQF_SHARED,
+ part->IPI_owner, (void *) (u64) partid);
+ if (ret != 0) {
+ dev_err(xpc_chan, "can't register NOTIFY IRQ handler, "
+ "errno=%d\n", -ret);
+ kfree(part->remote_openclose_args_base);
+ part->remote_openclose_args = NULL;
+ kfree(part->local_openclose_args_base);
+ part->local_openclose_args = NULL;
+ kfree(part->remote_GPs_base);
+ part->remote_GPs = NULL;
+ kfree(part->local_GPs_base);
+ part->local_GPs = NULL;
+ kfree(part->channels);
+ part->channels = NULL;
+ return xpcLackOfResources;
+ }
+
+ /* Setup a timer to check for dropped IPIs */
+ timer = &part->dropped_IPI_timer;
+ init_timer(timer);
+ timer->function = (void (*)(unsigned long)) xpc_dropped_IPI_check;
+ timer->data = (unsigned long) part;
+ timer->expires = jiffies + XPC_P_DROPPED_IPI_WAIT;
+ add_timer(timer);
+
+ /*
+ * With the setting of the partition setup_state to XPC_P_SETUP, we're
+ * declaring that this partition is ready to go.
+ */
+ part->setup_state = XPC_P_SETUP;
+
+
+ /*
+ * Setup the per partition specific variables required by the
+ * remote partition to establish channel connections with us.
+ *
+ * The setting of the magic # indicates that these per partition
+ * specific variables are ready to be used.
+ */
+ xpc_vars_part[partid].GPs_pa = __pa(part->local_GPs);
+ xpc_vars_part[partid].openclose_args_pa =
+ __pa(part->local_openclose_args);
+ xpc_vars_part[partid].IPI_amo_pa = __pa(part->local_IPI_amo_va);
+ cpuid = raw_smp_processor_id(); /* any CPU in this partition will do */
+ xpc_vars_part[partid].IPI_nasid = cpuid_to_nasid(cpuid);
+ xpc_vars_part[partid].IPI_phys_cpuid = cpu_physical_id(cpuid);
+ xpc_vars_part[partid].nchannels = part->nchannels;
+ xpc_vars_part[partid].magic = XPC_VP_MAGIC1;
+
+ return xpcSuccess;
+}
+
+
+/*
+ * Create a wrapper that hides the underlying mechanism for pulling a cacheline
+ * (or multiple cachelines) from a remote partition.
+ *
+ * src must be a cacheline aligned physical address on the remote partition.
+ * dst must be a cacheline aligned virtual address on this partition.
+ * cnt must be an cacheline sized
+ */
+static enum xpc_retval
+xpc_pull_remote_cachelines(struct xpc_partition *part, void *dst,
+ const void *src, size_t cnt)
+{
+ bte_result_t bte_ret;
+
+
+ DBUG_ON((u64) src != L1_CACHE_ALIGN((u64) src));
+ DBUG_ON((u64) dst != L1_CACHE_ALIGN((u64) dst));
+ DBUG_ON(cnt != L1_CACHE_ALIGN(cnt));
+
+ if (part->act_state == XPC_P_DEACTIVATING) {
+ return part->reason;
+ }
+
+ bte_ret = xp_bte_copy((u64) src, (u64) dst, (u64) cnt,
+ (BTE_NORMAL | BTE_WACQUIRE), NULL);
+ if (bte_ret == BTE_SUCCESS) {
+ return xpcSuccess;
+ }
+
+ dev_dbg(xpc_chan, "xp_bte_copy() from partition %d failed, ret=%d\n",
+ XPC_PARTID(part), bte_ret);
+
+ return xpc_map_bte_errors(bte_ret);
+}
+
+
+/*
+ * Pull the remote per partition specific variables from the specified
+ * partition.
+ */
+enum xpc_retval
+xpc_pull_remote_vars_part(struct xpc_partition *part)
+{
+ u8 buffer[L1_CACHE_BYTES * 2];
+ struct xpc_vars_part *pulled_entry_cacheline =
+ (struct xpc_vars_part *) L1_CACHE_ALIGN((u64) buffer);
+ struct xpc_vars_part *pulled_entry;
+ u64 remote_entry_cacheline_pa, remote_entry_pa;
+ partid_t partid = XPC_PARTID(part);
+ enum xpc_retval ret;
+
+
+ /* pull the cacheline that contains the variables we're interested in */
+
+ DBUG_ON(part->remote_vars_part_pa !=
+ L1_CACHE_ALIGN(part->remote_vars_part_pa));
+ DBUG_ON(sizeof(struct xpc_vars_part) != L1_CACHE_BYTES / 2);
+
+ remote_entry_pa = part->remote_vars_part_pa +
+ sn_partition_id * sizeof(struct xpc_vars_part);
+
+ remote_entry_cacheline_pa = (remote_entry_pa & ~(L1_CACHE_BYTES - 1));
+
+ pulled_entry = (struct xpc_vars_part *) ((u64) pulled_entry_cacheline +
+ (remote_entry_pa & (L1_CACHE_BYTES - 1)));
+
+ ret = xpc_pull_remote_cachelines(part, pulled_entry_cacheline,
+ (void *) remote_entry_cacheline_pa,
+ L1_CACHE_BYTES);
+ if (ret != xpcSuccess) {
+ dev_dbg(xpc_chan, "failed to pull XPC vars_part from "
+ "partition %d, ret=%d\n", partid, ret);
+ return ret;
+ }
+
+
+ /* see if they've been set up yet */
+
+ if (pulled_entry->magic != XPC_VP_MAGIC1 &&
+ pulled_entry->magic != XPC_VP_MAGIC2) {
+
+ if (pulled_entry->magic != 0) {
+ dev_dbg(xpc_chan, "partition %d's XPC vars_part for "
+ "partition %d has bad magic value (=0x%lx)\n",
+ partid, sn_partition_id, pulled_entry->magic);
+ return xpcBadMagic;
+ }
+
+ /* they've not been initialized yet */
+ return xpcRetry;
+ }
+
+ if (xpc_vars_part[partid].magic == XPC_VP_MAGIC1) {
+
+ /* validate the variables */
+
+ if (pulled_entry->GPs_pa == 0 ||
+ pulled_entry->openclose_args_pa == 0 ||
+ pulled_entry->IPI_amo_pa == 0) {
+
+ dev_err(xpc_chan, "partition %d's XPC vars_part for "
+ "partition %d are not valid\n", partid,
+ sn_partition_id);
+ return xpcInvalidAddress;
+ }
+
+ /* the variables we imported look to be valid */
+
+ part->remote_GPs_pa = pulled_entry->GPs_pa;
+ part->remote_openclose_args_pa =
+ pulled_entry->openclose_args_pa;
+ part->remote_IPI_amo_va =
+ (AMO_t *) __va(pulled_entry->IPI_amo_pa);
+ part->remote_IPI_nasid = pulled_entry->IPI_nasid;
+ part->remote_IPI_phys_cpuid = pulled_entry->IPI_phys_cpuid;
+
+ if (part->nchannels > pulled_entry->nchannels) {
+ part->nchannels = pulled_entry->nchannels;
+ }
+
+ /* let the other side know that we've pulled their variables */
+
+ xpc_vars_part[partid].magic = XPC_VP_MAGIC2;
+ }
+
+ if (pulled_entry->magic == XPC_VP_MAGIC1) {
+ return xpcRetry;
+ }
+
+ return xpcSuccess;
+}
+
+
+/*
+ * Get the IPI flags and pull the openclose args and/or remote GPs as needed.
+ */
+static u64
+xpc_get_IPI_flags(struct xpc_partition *part)
+{
+ unsigned long irq_flags;
+ u64 IPI_amo;
+ enum xpc_retval ret;
+
+
+ /*
+ * See if there are any IPI flags to be handled.
+ */
+
+ spin_lock_irqsave(&part->IPI_lock, irq_flags);
+ if ((IPI_amo = part->local_IPI_amo) != 0) {
+ part->local_IPI_amo = 0;
+ }
+ spin_unlock_irqrestore(&part->IPI_lock, irq_flags);
+
+
+ if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_amo)) {
+ ret = xpc_pull_remote_cachelines(part,
+ part->remote_openclose_args,
+ (void *) part->remote_openclose_args_pa,
+ XPC_OPENCLOSE_ARGS_SIZE);
+ if (ret != xpcSuccess) {
+ XPC_DEACTIVATE_PARTITION(part, ret);
+
+ dev_dbg(xpc_chan, "failed to pull openclose args from "
+ "partition %d, ret=%d\n", XPC_PARTID(part),
+ ret);
+
+ /* don't bother processing IPIs anymore */
+ IPI_amo = 0;
+ }
+ }
+
+ if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_amo)) {
+ ret = xpc_pull_remote_cachelines(part, part->remote_GPs,
+ (void *) part->remote_GPs_pa,
+ XPC_GP_SIZE);
+ if (ret != xpcSuccess) {
+ XPC_DEACTIVATE_PARTITION(part, ret);
+
+ dev_dbg(xpc_chan, "failed to pull GPs from partition "
+ "%d, ret=%d\n", XPC_PARTID(part), ret);
+
+ /* don't bother processing IPIs anymore */
+ IPI_amo = 0;
+ }
+ }
+
+ return IPI_amo;
+}
+
+
+/*
+ * Allocate the local message queue and the notify queue.
+ */
+static enum xpc_retval
+xpc_allocate_local_msgqueue(struct xpc_channel *ch)
+{
+ unsigned long irq_flags;
+ int nentries;
+ size_t nbytes;
+
+
+ // >>> may want to check for ch->flags & XPC_C_DISCONNECTING between
+ // >>> iterations of the for-loop, bail if set?
+
+ // >>> should we impose a minimum #of entries? like 4 or 8?
+ for (nentries = ch->local_nentries; nentries > 0; nentries--) {
+
+ nbytes = nentries * ch->msg_size;
+ ch->local_msgqueue = xpc_kzalloc_cacheline_aligned(nbytes,
+ GFP_KERNEL,
+ &ch->local_msgqueue_base);
+ if (ch->local_msgqueue == NULL) {
+ continue;
+ }
+
+ nbytes = nentries * sizeof(struct xpc_notify);
+ ch->notify_queue = kzalloc(nbytes, GFP_KERNEL);
+ if (ch->notify_queue == NULL) {
+ kfree(ch->local_msgqueue_base);
+ ch->local_msgqueue = NULL;
+ continue;
+ }
+
+ spin_lock_irqsave(&ch->lock, irq_flags);
+ if (nentries < ch->local_nentries) {
+ dev_dbg(xpc_chan, "nentries=%d local_nentries=%d, "
+ "partid=%d, channel=%d\n", nentries,
+ ch->local_nentries, ch->partid, ch->number);
+
+ ch->local_nentries = nentries;
+ }
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return xpcSuccess;
+ }
+
+ dev_dbg(xpc_chan, "can't get memory for local message queue and notify "
+ "queue, partid=%d, channel=%d\n", ch->partid, ch->number);
+ return xpcNoMemory;
+}
+
+
+/*
+ * Allocate the cached remote message queue.
+ */
+static enum xpc_retval
+xpc_allocate_remote_msgqueue(struct xpc_channel *ch)
+{
+ unsigned long irq_flags;
+ int nentries;
+ size_t nbytes;
+
+
+ DBUG_ON(ch->remote_nentries <= 0);
+
+ // >>> may want to check for ch->flags & XPC_C_DISCONNECTING between
+ // >>> iterations of the for-loop, bail if set?
+
+ // >>> should we impose a minimum #of entries? like 4 or 8?
+ for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
+
+ nbytes = nentries * ch->msg_size;
+ ch->remote_msgqueue = xpc_kzalloc_cacheline_aligned(nbytes,
+ GFP_KERNEL,
+ &ch->remote_msgqueue_base);
+ if (ch->remote_msgqueue == NULL) {
+ continue;
+ }
+
+ spin_lock_irqsave(&ch->lock, irq_flags);
+ if (nentries < ch->remote_nentries) {
+ dev_dbg(xpc_chan, "nentries=%d remote_nentries=%d, "
+ "partid=%d, channel=%d\n", nentries,
+ ch->remote_nentries, ch->partid, ch->number);
+
+ ch->remote_nentries = nentries;
+ }
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return xpcSuccess;
+ }
+
+ dev_dbg(xpc_chan, "can't get memory for cached remote message queue, "
+ "partid=%d, channel=%d\n", ch->partid, ch->number);
+ return xpcNoMemory;
+}
+
+
+/*
+ * Allocate message queues and other stuff associated with a channel.
+ *
+ * Note: Assumes all of the channel sizes are filled in.
+ */
+static enum xpc_retval
+xpc_allocate_msgqueues(struct xpc_channel *ch)
+{
+ unsigned long irq_flags;
+ enum xpc_retval ret;
+
+
+ DBUG_ON(ch->flags & XPC_C_SETUP);
+
+ if ((ret = xpc_allocate_local_msgqueue(ch)) != xpcSuccess) {
+ return ret;
+ }
+
+ if ((ret = xpc_allocate_remote_msgqueue(ch)) != xpcSuccess) {
+ kfree(ch->local_msgqueue_base);
+ ch->local_msgqueue = NULL;
+ kfree(ch->notify_queue);
+ ch->notify_queue = NULL;
+ return ret;
+ }
+
+ spin_lock_irqsave(&ch->lock, irq_flags);
+ ch->flags |= XPC_C_SETUP;
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+ return xpcSuccess;
+}
+
+
+/*
+ * Process a connect message from a remote partition.
+ *
+ * Note: xpc_process_connect() is expecting to be called with the
+ * spin_lock_irqsave held and will leave it locked upon return.
+ */
+static void
+xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+ enum xpc_retval ret;
+
+
+ DBUG_ON(!spin_is_locked(&ch->lock));
+
+ if (!(ch->flags & XPC_C_OPENREQUEST) ||
+ !(ch->flags & XPC_C_ROPENREQUEST)) {
+ /* nothing more to do for now */
+ return;
+ }
+ DBUG_ON(!(ch->flags & XPC_C_CONNECTING));
+
+ if (!(ch->flags & XPC_C_SETUP)) {
+ spin_unlock_irqrestore(&ch->lock, *irq_flags);
+ ret = xpc_allocate_msgqueues(ch);
+ spin_lock_irqsave(&ch->lock, *irq_flags);
+
+ if (ret != xpcSuccess) {
+ XPC_DISCONNECT_CHANNEL(ch, ret, irq_flags);
+ }
+ if (ch->flags & (XPC_C_CONNECTED | XPC_C_DISCONNECTING)) {
+ return;
+ }
+
+ DBUG_ON(!(ch->flags & XPC_C_SETUP));
+ DBUG_ON(ch->local_msgqueue == NULL);
+ DBUG_ON(ch->remote_msgqueue == NULL);
+ }
+
+ if (!(ch->flags & XPC_C_OPENREPLY)) {
+ ch->flags |= XPC_C_OPENREPLY;
+ xpc_IPI_send_openreply(ch, irq_flags);
+ }
+
+ if (!(ch->flags & XPC_C_ROPENREPLY)) {
+ return;
+ }
+
+ DBUG_ON(ch->remote_msgqueue_pa == 0);
+
+ ch->flags = (XPC_C_CONNECTED | XPC_C_SETUP); /* clear all else */
+
+ dev_info(xpc_chan, "channel %d to partition %d connected\n",
+ ch->number, ch->partid);
+
+ spin_unlock_irqrestore(&ch->lock, *irq_flags);
+ xpc_create_kthreads(ch, 1, 0);
+ spin_lock_irqsave(&ch->lock, *irq_flags);
+}
+
+
+/*
+ * Notify those who wanted to be notified upon delivery of their message.
+ */
+static void
+xpc_notify_senders(struct xpc_channel *ch, enum xpc_retval reason, s64 put)
+{
+ struct xpc_notify *notify;
+ u8 notify_type;
+ s64 get = ch->w_remote_GP.get - 1;
+
+
+ while (++get < put && atomic_read(&ch->n_to_notify) > 0) {
+
+ notify = &ch->notify_queue[get % ch->local_nentries];
+
+ /*
+ * See if the notify entry indicates it was associated with
+ * a message who's sender wants to be notified. It is possible
+ * that it is, but someone else is doing or has done the
+ * notification.
+ */
+ notify_type = notify->type;
+ if (notify_type == 0 ||
+ cmpxchg(¬ify->type, notify_type, 0) !=
+ notify_type) {
+ continue;
+ }
+
+ DBUG_ON(notify_type != XPC_N_CALL);
+
+ atomic_dec(&ch->n_to_notify);
+
+ if (notify->func != NULL) {
+ dev_dbg(xpc_chan, "notify->func() called, notify=0x%p, "
+ "msg_number=%ld, partid=%d, channel=%d\n",
+ (void *) notify, get, ch->partid, ch->number);
+
+ notify->func(reason, ch->partid, ch->number,
+ notify->key);
+
+ dev_dbg(xpc_chan, "notify->func() returned, "
+ "notify=0x%p, msg_number=%ld, partid=%d, "
+ "channel=%d\n", (void *) notify, get,
+ ch->partid, ch->number);
+ }
+ }
+}
+
+
+/*
+ * Free up message queues and other stuff that were allocated for the specified
+ * channel.
+ *
+ * Note: ch->reason and ch->reason_line are left set for debugging purposes,
+ * they're cleared when XPC_C_DISCONNECTED is cleared.
+ */
+static void
+xpc_free_msgqueues(struct xpc_channel *ch)
+{
+ DBUG_ON(!spin_is_locked(&ch->lock));
+ DBUG_ON(atomic_read(&ch->n_to_notify) != 0);
+
+ ch->remote_msgqueue_pa = 0;
+ ch->func = NULL;
+ ch->key = NULL;
+ ch->msg_size = 0;
+ ch->local_nentries = 0;
+ ch->remote_nentries = 0;
+ ch->kthreads_assigned_limit = 0;
+ ch->kthreads_idle_limit = 0;
+
+ ch->local_GP->get = 0;
+ ch->local_GP->put = 0;
+ ch->remote_GP.get = 0;
+ ch->remote_GP.put = 0;
+ ch->w_local_GP.get = 0;
+ ch->w_local_GP.put = 0;
+ ch->w_remote_GP.get = 0;
+ ch->w_remote_GP.put = 0;
+ ch->next_msg_to_pull = 0;
+
+ if (ch->flags & XPC_C_SETUP) {
+ ch->flags &= ~XPC_C_SETUP;
+
+ dev_dbg(xpc_chan, "ch->flags=0x%x, partid=%d, channel=%d\n",
+ ch->flags, ch->partid, ch->number);
+
+ kfree(ch->local_msgqueue_base);
+ ch->local_msgqueue = NULL;
+ kfree(ch->remote_msgqueue_base);
+ ch->remote_msgqueue = NULL;
+ kfree(ch->notify_queue);
+ ch->notify_queue = NULL;
+ }
+}
+
+
+/*
+ * spin_lock_irqsave() is expected to be held on entry.
+ */
+static void
+xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+ struct xpc_partition *part = &xpc_partitions[ch->partid];
+ u32 channel_was_connected = (ch->flags & XPC_C_WASCONNECTED);
+
+
+ DBUG_ON(!spin_is_locked(&ch->lock));
+
+ if (!(ch->flags & XPC_C_DISCONNECTING)) {
+ return;
+ }
+
+ DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
+
+ /* make sure all activity has settled down first */
+
+ if (atomic_read(&ch->kthreads_assigned) > 0 ||
+ atomic_read(&ch->references) > 0) {
+ return;
+ }
+ DBUG_ON((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
+ !(ch->flags & XPC_C_DISCONNECTINGCALLOUT_MADE));
+
+ if (part->act_state == XPC_P_DEACTIVATING) {
+ /* can't proceed until the other side disengages from us */
+ if (xpc_partition_engaged(1UL << ch->partid)) {
+ return;
+ }
+
+ } else {
+
+ /* as long as the other side is up do the full protocol */
+
+ if (!(ch->flags & XPC_C_RCLOSEREQUEST)) {
+ return;
+ }
+
+ if (!(ch->flags & XPC_C_CLOSEREPLY)) {
+ ch->flags |= XPC_C_CLOSEREPLY;
+ xpc_IPI_send_closereply(ch, irq_flags);
+ }
+
+ if (!(ch->flags & XPC_C_RCLOSEREPLY)) {
+ return;
+ }
+ }
+
+ /* wake those waiting for notify completion */
+ if (atomic_read(&ch->n_to_notify) > 0) {
+ /* >>> we do callout while holding ch->lock */
+ xpc_notify_senders(ch, ch->reason, ch->w_local_GP.put);
+ }
+
+ /* both sides are disconnected now */
+
+ if (ch->flags & XPC_C_DISCONNECTINGCALLOUT_MADE) {
+ spin_unlock_irqrestore(&ch->lock, *irq_flags);
+ xpc_disconnect_callout(ch, xpcDisconnected);
+ spin_lock_irqsave(&ch->lock, *irq_flags);
+ }
+
+ /* it's now safe to free the channel's message queues */
+ xpc_free_msgqueues(ch);
+
+ /* mark disconnected, clear all other flags except XPC_C_WDISCONNECT */
+ ch->flags = (XPC_C_DISCONNECTED | (ch->flags & XPC_C_WDISCONNECT));
+
+ atomic_dec(&part->nchannels_active);
+
+ if (channel_was_connected) {
+ dev_info(xpc_chan, "channel %d to partition %d disconnected, "
+ "reason=%d\n", ch->number, ch->partid, ch->reason);
+ }
+
+ if (ch->flags & XPC_C_WDISCONNECT) {
+ /* we won't lose the CPU since we're holding ch->lock */
+ complete(&ch->wdisconnect_wait);
+ } else if (ch->delayed_IPI_flags) {
+ if (part->act_state != XPC_P_DEACTIVATING) {
+ /* time to take action on any delayed IPI flags */
+ spin_lock(&part->IPI_lock);
+ XPC_SET_IPI_FLAGS(part->local_IPI_amo, ch->number,
+ ch->delayed_IPI_flags);
+ spin_unlock(&part->IPI_lock);
+ }
+ ch->delayed_IPI_flags = 0;
+ }
+}
+
+
+/*
+ * Process a change in the channel's remote connection state.
+ */
+static void
+xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
+ u8 IPI_flags)
+{
+ unsigned long irq_flags;
+ struct xpc_openclose_args *args =
+ &part->remote_openclose_args[ch_number];
+ struct xpc_channel *ch = &part->channels[ch_number];
+ enum xpc_retval reason;
+
+
+
+ spin_lock_irqsave(&ch->lock, irq_flags);
+
+again:
+
+ if ((ch->flags & XPC_C_DISCONNECTED) &&
+ (ch->flags & XPC_C_WDISCONNECT)) {
+ /*
+ * Delay processing IPI flags until thread waiting disconnect
+ * has had a chance to see that the channel is disconnected.
+ */
+ ch->delayed_IPI_flags |= IPI_flags;
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return;
+ }
+
+
+ if (IPI_flags & XPC_IPI_CLOSEREQUEST) {
+
+ dev_dbg(xpc_chan, "XPC_IPI_CLOSEREQUEST (reason=%d) received "
+ "from partid=%d, channel=%d\n", args->reason,
+ ch->partid, ch->number);
+
+ /*
+ * If RCLOSEREQUEST is set, we're probably waiting for
+ * RCLOSEREPLY. We should find it and a ROPENREQUEST packed
+ * with this RCLOSEREQUEST in the IPI_flags.
+ */
+
+ if (ch->flags & XPC_C_RCLOSEREQUEST) {
+ DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
+ DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
+ DBUG_ON(!(ch->flags & XPC_C_CLOSEREPLY));
+ DBUG_ON(ch->flags & XPC_C_RCLOSEREPLY);
+
+ DBUG_ON(!(IPI_flags & XPC_IPI_CLOSEREPLY));
+ IPI_flags &= ~XPC_IPI_CLOSEREPLY;
+ ch->flags |= XPC_C_RCLOSEREPLY;
+
+ /* both sides have finished disconnecting */
+ xpc_process_disconnect(ch, &irq_flags);
+ DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));
+ goto again;
+ }
+
+ if (ch->flags & XPC_C_DISCONNECTED) {
+ if (!(IPI_flags & XPC_IPI_OPENREQUEST)) {
+ if ((XPC_GET_IPI_FLAGS(part->local_IPI_amo,
+ ch_number) & XPC_IPI_OPENREQUEST)) {
+
+ DBUG_ON(ch->delayed_IPI_flags != 0);
+ spin_lock(&part->IPI_lock);
+ XPC_SET_IPI_FLAGS(part->local_IPI_amo,
+ ch_number,
+ XPC_IPI_CLOSEREQUEST);
+ spin_unlock(&part->IPI_lock);
+ }
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return;
+ }
+
+ XPC_SET_REASON(ch, 0, 0);
+ ch->flags &= ~XPC_C_DISCONNECTED;
+
+ atomic_inc(&part->nchannels_active);
+ ch->flags |= (XPC_C_CONNECTING | XPC_C_ROPENREQUEST);
+ }
+
+ IPI_flags &= ~(XPC_IPI_OPENREQUEST | XPC_IPI_OPENREPLY);
+
+ /*
+ * The meaningful CLOSEREQUEST connection state fields are:
+ * reason = reason connection is to be closed
+ */
+
+ ch->flags |= XPC_C_RCLOSEREQUEST;
+
+ if (!(ch->flags & XPC_C_DISCONNECTING)) {
+ reason = args->reason;
+ if (reason <= xpcSuccess || reason > xpcUnknownReason) {
+ reason = xpcUnknownReason;
+ } else if (reason == xpcUnregistering) {
+ reason = xpcOtherUnregistering;
+ }
+
+ XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);
+
+ DBUG_ON(IPI_flags & XPC_IPI_CLOSEREPLY);
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return;
+ }
+
+ xpc_process_disconnect(ch, &irq_flags);
+ }
+
+
+ if (IPI_flags & XPC_IPI_CLOSEREPLY) {
+
+ dev_dbg(xpc_chan, "XPC_IPI_CLOSEREPLY received from partid=%d,"
+ " channel=%d\n", ch->partid, ch->number);
+
+ if (ch->flags & XPC_C_DISCONNECTED) {
+ DBUG_ON(part->act_state != XPC_P_DEACTIVATING);
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return;
+ }
+
+ DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
+
+ if (!(ch->flags & XPC_C_RCLOSEREQUEST)) {
+ if ((XPC_GET_IPI_FLAGS(part->local_IPI_amo, ch_number)
+ & XPC_IPI_CLOSEREQUEST)) {
+
+ DBUG_ON(ch->delayed_IPI_flags != 0);
+ spin_lock(&part->IPI_lock);
+ XPC_SET_IPI_FLAGS(part->local_IPI_amo,
+ ch_number, XPC_IPI_CLOSEREPLY);
+ spin_unlock(&part->IPI_lock);
+ }
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return;
+ }
+
+ ch->flags |= XPC_C_RCLOSEREPLY;
+
+ if (ch->flags & XPC_C_CLOSEREPLY) {
+ /* both sides have finished disconnecting */
+ xpc_process_disconnect(ch, &irq_flags);
+ }
+ }
+
+
+ if (IPI_flags & XPC_IPI_OPENREQUEST) {
+
+ dev_dbg(xpc_chan, "XPC_IPI_OPENREQUEST (msg_size=%d, "
+ "local_nentries=%d) received from partid=%d, "
+ "channel=%d\n", args->msg_size, args->local_nentries,
+ ch->partid, ch->number);
+
+ if (part->act_state == XPC_P_DEACTIVATING ||
+ (ch->flags & XPC_C_ROPENREQUEST)) {
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return;
+ }
+
+ if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_WDISCONNECT)) {
+ ch->delayed_IPI_flags |= XPC_IPI_OPENREQUEST;
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return;
+ }
+ DBUG_ON(!(ch->flags & (XPC_C_DISCONNECTED |
+ XPC_C_OPENREQUEST)));
+ DBUG_ON(ch->flags & (XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY |
+ XPC_C_OPENREPLY | XPC_C_CONNECTED));
+
+ /*
+ * The meaningful OPENREQUEST connection state fields are:
+ * msg_size = size of channel's messages in bytes
+ * local_nentries = remote partition's local_nentries
+ */
+ if (args->msg_size == 0 || args->local_nentries == 0) {
+ /* assume OPENREQUEST was delayed by mistake */
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return;
+ }
+
+ ch->flags |= (XPC_C_ROPENREQUEST | XPC_C_CONNECTING);
+ ch->remote_nentries = args->local_nentries;
+
+
+ if (ch->flags & XPC_C_OPENREQUEST) {
+ if (args->msg_size != ch->msg_size) {
+ XPC_DISCONNECT_CHANNEL(ch, xpcUnequalMsgSizes,
+ &irq_flags);
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return;
+ }
+ } else {
+ ch->msg_size = args->msg_size;
+
+ XPC_SET_REASON(ch, 0, 0);
+ ch->flags &= ~XPC_C_DISCONNECTED;
+
+ atomic_inc(&part->nchannels_active);
+ }
+
+ xpc_process_connect(ch, &irq_flags);
+ }
+
+
+ if (IPI_flags & XPC_IPI_OPENREPLY) {
+
+ dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY (local_msgqueue_pa=0x%lx, "
+ "local_nentries=%d, remote_nentries=%d) received from "
+ "partid=%d, channel=%d\n", args->local_msgqueue_pa,
+ args->local_nentries, args->remote_nentries,
+ ch->partid, ch->number);
+
+ if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED)) {
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return;
+ }
+ if (!(ch->flags & XPC_C_OPENREQUEST)) {
+ XPC_DISCONNECT_CHANNEL(ch, xpcOpenCloseError,
+ &irq_flags);
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return;
+ }
+
+ DBUG_ON(!(ch->flags & XPC_C_ROPENREQUEST));
+ DBUG_ON(ch->flags & XPC_C_CONNECTED);
+
+ /*
+ * The meaningful OPENREPLY connection state fields are:
+ * local_msgqueue_pa = physical address of remote
+ * partition's local_msgqueue
+ * local_nentries = remote partition's local_nentries
+ * remote_nentries = remote partition's remote_nentries
+ */
+ DBUG_ON(args->local_msgqueue_pa == 0);
+ DBUG_ON(args->local_nentries == 0);
+ DBUG_ON(args->remote_nentries == 0);
+
+ ch->flags |= XPC_C_ROPENREPLY;
+ ch->remote_msgqueue_pa = args->local_msgqueue_pa;
+
+ if (args->local_nentries < ch->remote_nentries) {
+ dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new "
+ "remote_nentries=%d, old remote_nentries=%d, "
+ "partid=%d, channel=%d\n",
+ args->local_nentries, ch->remote_nentries,
+ ch->partid, ch->number);
+
+ ch->remote_nentries = args->local_nentries;
+ }
+ if (args->remote_nentries < ch->local_nentries) {
+ dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new "
+ "local_nentries=%d, old local_nentries=%d, "
+ "partid=%d, channel=%d\n",
+ args->remote_nentries, ch->local_nentries,
+ ch->partid, ch->number);
+
+ ch->local_nentries = args->remote_nentries;
+ }
+
+ xpc_process_connect(ch, &irq_flags);
+ }
+
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+}
+
+
+/*
+ * Attempt to establish a channel connection to a remote partition.
+ */
+static enum xpc_retval
+xpc_connect_channel(struct xpc_channel *ch)
+{
+ unsigned long irq_flags;
+ struct xpc_registration *registration = &xpc_registrations[ch->number];
+
+
+ if (mutex_trylock(®istration->mutex) == 0) {
+ return xpcRetry;
+ }
+
+ if (!XPC_CHANNEL_REGISTERED(ch->number)) {
+ mutex_unlock(®istration->mutex);
+ return xpcUnregistered;
+ }
+
+ spin_lock_irqsave(&ch->lock, irq_flags);
+
+ DBUG_ON(ch->flags & XPC_C_CONNECTED);
+ DBUG_ON(ch->flags & XPC_C_OPENREQUEST);
+
+ if (ch->flags & XPC_C_DISCONNECTING) {
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ mutex_unlock(®istration->mutex);
+ return ch->reason;
+ }
+
+
+ /* add info from the channel connect registration to the channel */
+
+ ch->kthreads_assigned_limit = registration->assigned_limit;
+ ch->kthreads_idle_limit = registration->idle_limit;
+ DBUG_ON(atomic_read(&ch->kthreads_assigned) != 0);
+ DBUG_ON(atomic_read(&ch->kthreads_idle) != 0);
+ DBUG_ON(atomic_read(&ch->kthreads_active) != 0);
+
+ ch->func = registration->func;
+ DBUG_ON(registration->func == NULL);
+ ch->key = registration->key;
+
+ ch->local_nentries = registration->nentries;
+
+ if (ch->flags & XPC_C_ROPENREQUEST) {
+ if (registration->msg_size != ch->msg_size) {
+ /* the local and remote sides aren't the same */
+
+ /*
+ * Because XPC_DISCONNECT_CHANNEL() can block we're
+ * forced to up the registration sema before we unlock
+ * the channel lock. But that's okay here because we're
+ * done with the part that required the registration
+ * sema. XPC_DISCONNECT_CHANNEL() requires that the
+ * channel lock be locked and will unlock and relock
+ * the channel lock as needed.
+ */
+ mutex_unlock(®istration->mutex);
+ XPC_DISCONNECT_CHANNEL(ch, xpcUnequalMsgSizes,
+ &irq_flags);
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ return xpcUnequalMsgSizes;
+ }
+ } else {
+ ch->msg_size = registration->msg_size;
+
+ XPC_SET_REASON(ch, 0, 0);
+ ch->flags &= ~XPC_C_DISCONNECTED;
+
+ atomic_inc(&xpc_partitions[ch->partid].nchannels_active);
+ }
+
+ mutex_unlock(®istration->mutex);
+
+
+ /* initiate the connection */
+
+ ch->flags |= (XPC_C_OPENREQUEST | XPC_C_CONNECTING);
+ xpc_IPI_send_openrequest(ch, &irq_flags);
+
+ xpc_process_connect(ch, &irq_flags);
+
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+ return xpcSuccess;
+}
+
+
+/*
+ * Clear some of the msg flags in the local message queue.
+ */
+static inline void
+xpc_clear_local_msgqueue_flags(struct xpc_channel *ch)
+{
+ struct xpc_msg *msg;
+ s64 get;
+
+
+ get = ch->w_remote_GP.get;
+ do {
+ msg = (struct xpc_msg *) ((u64) ch->local_msgqueue +
+ (get % ch->local_nentries) * ch->msg_size);
+ msg->flags = 0;
+ } while (++get < (volatile s64) ch->remote_GP.get);
+}
+
+
+/*
+ * Clear some of the msg flags in the remote message queue.
+ */
+static inline void
+xpc_clear_remote_msgqueue_flags(struct xpc_channel *ch)
+{
+ struct xpc_msg *msg;
+ s64 put;
+
+
+ put = ch->w_remote_GP.put;
+ do {
+ msg = (struct xpc_msg *) ((u64) ch->remote_msgqueue +
+ (put % ch->remote_nentries) * ch->msg_size);
+ msg->flags = 0;
+ } while (++put < (volatile s64) ch->remote_GP.put);
+}
+
+
+static void
+xpc_process_msg_IPI(struct xpc_partition *part, int ch_number)
+{
+ struct xpc_channel *ch = &part->channels[ch_number];
+ int nmsgs_sent;
+
+
+ ch->remote_GP = part->remote_GPs[ch_number];
+
+
+ /* See what, if anything, has changed for each connected channel */
+
+ xpc_msgqueue_ref(ch);
+
+ if (ch->w_remote_GP.get == ch->remote_GP.get &&
+ ch->w_remote_GP.put == ch->remote_GP.put) {
+ /* nothing changed since GPs were last pulled */
+ xpc_msgqueue_deref(ch);
+ return;
+ }
+
+ if (!(ch->flags & XPC_C_CONNECTED)){
+ xpc_msgqueue_deref(ch);
+ return;
+ }
+
+
+ /*
+ * First check to see if messages recently sent by us have been
+ * received by the other side. (The remote GET value will have
+ * changed since we last looked at it.)
+ */
+
+ if (ch->w_remote_GP.get != ch->remote_GP.get) {
+
+ /*
+ * We need to notify any senders that want to be notified
+ * that their sent messages have been received by their
+ * intended recipients. We need to do this before updating
+ * w_remote_GP.get so that we don't allocate the same message
+ * queue entries prematurely (see xpc_allocate_msg()).
+ */
+ if (atomic_read(&ch->n_to_notify) > 0) {
+ /*
+ * Notify senders that messages sent have been
+ * received and delivered by the other side.
+ */
+ xpc_notify_senders(ch, xpcMsgDelivered,
+ ch->remote_GP.get);
+ }
+
+ /*
+ * Clear msg->flags in previously sent messages, so that
+ * they're ready for xpc_allocate_msg().
+ */
+ xpc_clear_local_msgqueue_flags(ch);
+
+ ch->w_remote_GP.get = ch->remote_GP.get;
+
+ dev_dbg(xpc_chan, "w_remote_GP.get changed to %ld, partid=%d, "
+ "channel=%d\n", ch->w_remote_GP.get, ch->partid,
+ ch->number);
+
+ /*
+ * If anyone was waiting for message queue entries to become
+ * available, wake them up.
+ */
+ if (atomic_read(&ch->n_on_msg_allocate_wq) > 0) {
+ wake_up(&ch->msg_allocate_wq);
+ }
+ }
+
+
+ /*
+ * Now check for newly sent messages by the other side. (The remote
+ * PUT value will have changed since we last looked at it.)
+ */
+
+ if (ch->w_remote_GP.put != ch->remote_GP.put) {
+ /*
+ * Clear msg->flags in previously received messages, so that
+ * they're ready for xpc_get_deliverable_msg().
+ */
+ xpc_clear_remote_msgqueue_flags(ch);
+
+ ch->w_remote_GP.put = ch->remote_GP.put;
+
+ dev_dbg(xpc_chan, "w_remote_GP.put changed to %ld, partid=%d, "
+ "channel=%d\n", ch->w_remote_GP.put, ch->partid,
+ ch->number);
+
+ nmsgs_sent = ch->w_remote_GP.put - ch->w_local_GP.get;
+ if (nmsgs_sent > 0) {
+ dev_dbg(xpc_chan, "msgs waiting to be copied and "
+ "delivered=%d, partid=%d, channel=%d\n",
+ nmsgs_sent, ch->partid, ch->number);
+
+ if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
+ xpc_activate_kthreads(ch, nmsgs_sent);
+ }
+ }
+ }
+
+ xpc_msgqueue_deref(ch);
+}
+
+
+void
+xpc_process_channel_activity(struct xpc_partition *part)
+{
+ unsigned long irq_flags;
+ u64 IPI_amo, IPI_flags;
+ struct xpc_channel *ch;
+ int ch_number;
+ u32 ch_flags;
+
+
+ IPI_amo = xpc_get_IPI_flags(part);
+
+ /*
+ * Initiate channel connections for registered channels.
+ *
+ * For each connected channel that has pending messages activate idle
+ * kthreads and/or create new kthreads as needed.
+ */
+
+ for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
+ ch = &part->channels[ch_number];
+
+
+ /*
+ * Process any open or close related IPI flags, and then deal
+ * with connecting or disconnecting the channel as required.
+ */
+
+ IPI_flags = XPC_GET_IPI_FLAGS(IPI_amo, ch_number);
+
+ if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_flags)) {
+ xpc_process_openclose_IPI(part, ch_number, IPI_flags);
+ }
+
+ ch_flags = ch->flags; /* need an atomic snapshot of flags */
+
+ if (ch_flags & XPC_C_DISCONNECTING) {
+ spin_lock_irqsave(&ch->lock, irq_flags);
+ xpc_process_disconnect(ch, &irq_flags);
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ continue;
+ }
+
+ if (part->act_state == XPC_P_DEACTIVATING) {
+ continue;
+ }
+
+ if (!(ch_flags & XPC_C_CONNECTED)) {
+ if (!(ch_flags & XPC_C_OPENREQUEST)) {
+ DBUG_ON(ch_flags & XPC_C_SETUP);
+ (void) xpc_connect_channel(ch);
+ } else {
+ spin_lock_irqsave(&ch->lock, irq_flags);
+ xpc_process_connect(ch, &irq_flags);
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ }
+ continue;
+ }
+
+
+ /*
+ * Process any message related IPI flags, this may involve the
+ * activation of kthreads to deliver any pending messages sent
+ * from the other partition.
+ */
+
+ if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_flags)) {
+ xpc_process_msg_IPI(part, ch_number);
+ }
+ }
+}
+
+
+/*
+ * XPC's heartbeat code calls this function to inform XPC that a partition is
+ * going down. XPC responds by tearing down the XPartition Communication
+ * infrastructure used for the just downed partition.
+ *
+ * XPC's heartbeat code will never call this function and xpc_partition_up()
+ * at the same time. Nor will it ever make multiple calls to either function
+ * at the same time.
+ */
+void
+xpc_partition_going_down(struct xpc_partition *part, enum xpc_retval reason)
+{
+ unsigned long irq_flags;
+ int ch_number;
+ struct xpc_channel *ch;
+
+
+ dev_dbg(xpc_chan, "deactivating partition %d, reason=%d\n",
+ XPC_PARTID(part), reason);
+
+ if (!xpc_part_ref(part)) {
+ /* infrastructure for this partition isn't currently set up */
+ return;
+ }
+
+
+ /* disconnect channels associated with the partition going down */
+
+ for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
+ ch = &part->channels[ch_number];
+
+ xpc_msgqueue_ref(ch);
+ spin_lock_irqsave(&ch->lock, irq_flags);
+
+ XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);
+
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ xpc_msgqueue_deref(ch);
+ }
+
+ xpc_wakeup_channel_mgr(part);
+
+ xpc_part_deref(part);
+}
+
+
+/*
+ * Teardown the infrastructure necessary to support XPartition Communication
+ * between the specified remote partition and the local one.
+ */
+void
+xpc_teardown_infrastructure(struct xpc_partition *part)
+{
+ partid_t partid = XPC_PARTID(part);
+
+
+ /*
+ * We start off by making this partition inaccessible to local
+ * processes by marking it as no longer setup. Then we make it
+ * inaccessible to remote processes by clearing the XPC per partition
+ * specific variable's magic # (which indicates that these variables
+ * are no longer valid) and by ignoring all XPC notify IPIs sent to
+ * this partition.
+ */
+
+ DBUG_ON(atomic_read(&part->nchannels_engaged) != 0);
+ DBUG_ON(atomic_read(&part->nchannels_active) != 0);
+ DBUG_ON(part->setup_state != XPC_P_SETUP);
+ part->setup_state = XPC_P_WTEARDOWN;
+
+ xpc_vars_part[partid].magic = 0;
+
+
+ free_irq(SGI_XPC_NOTIFY, (void *) (u64) partid);
+
+
+ /*
+ * Before proceeding with the teardown we have to wait until all
+ * existing references cease.
+ */
+ wait_event(part->teardown_wq, (atomic_read(&part->references) == 0));
+
+
+ /* now we can begin tearing down the infrastructure */
+
+ part->setup_state = XPC_P_TORNDOWN;
+
+ /* in case we've still got outstanding timers registered... */
+ del_timer_sync(&part->dropped_IPI_timer);
+
+ kfree(part->remote_openclose_args_base);
+ part->remote_openclose_args = NULL;
+ kfree(part->local_openclose_args_base);
+ part->local_openclose_args = NULL;
+ kfree(part->remote_GPs_base);
+ part->remote_GPs = NULL;
+ kfree(part->local_GPs_base);
+ part->local_GPs = NULL;
+ kfree(part->channels);
+ part->channels = NULL;
+ part->local_IPI_amo_va = NULL;
+}
+
+
+/*
+ * Called by XP at the time of channel connection registration to cause
+ * XPC to establish connections to all currently active partitions.
+ */
+void
+xpc_initiate_connect(int ch_number)
+{
+ partid_t partid;
+ struct xpc_partition *part;
+ struct xpc_channel *ch;
+
+
+ DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
+
+ for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+ part = &xpc_partitions[partid];
+
+ if (xpc_part_ref(part)) {
+ ch = &part->channels[ch_number];
+
+ /*
+ * Initiate the establishment of a connection on the
+ * newly registered channel to the remote partition.
+ */
+ xpc_wakeup_channel_mgr(part);
+ xpc_part_deref(part);
+ }
+ }
+}
+
+
+void
+xpc_connected_callout(struct xpc_channel *ch)
+{
+ /* let the registerer know that a connection has been established */
+
+ if (ch->func != NULL) {
+ dev_dbg(xpc_chan, "ch->func() called, reason=xpcConnected, "
+ "partid=%d, channel=%d\n", ch->partid, ch->number);
+
+ ch->func(xpcConnected, ch->partid, ch->number,
+ (void *) (u64) ch->local_nentries, ch->key);
+
+ dev_dbg(xpc_chan, "ch->func() returned, reason=xpcConnected, "
+ "partid=%d, channel=%d\n", ch->partid, ch->number);
+ }
+}
+
+
+/*
+ * Called by XP at the time of channel connection unregistration to cause
+ * XPC to teardown all current connections for the specified channel.
+ *
+ * Before returning xpc_initiate_disconnect() will wait until all connections
+ * on the specified channel have been closed/torndown. So the caller can be
+ * assured that they will not be receiving any more callouts from XPC to the
+ * function they registered via xpc_connect().
+ *
+ * Arguments:
+ *
+ * ch_number - channel # to unregister.
+ */
+void
+xpc_initiate_disconnect(int ch_number)
+{
+ unsigned long irq_flags;
+ partid_t partid;
+ struct xpc_partition *part;
+ struct xpc_channel *ch;
+
+
+ DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
+
+ /* initiate the channel disconnect for every active partition */
+ for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+ part = &xpc_partitions[partid];
+
+ if (xpc_part_ref(part)) {
+ ch = &part->channels[ch_number];
+ xpc_msgqueue_ref(ch);
+
+ spin_lock_irqsave(&ch->lock, irq_flags);
+
+ if (!(ch->flags & XPC_C_DISCONNECTED)) {
+ ch->flags |= XPC_C_WDISCONNECT;
+
+ XPC_DISCONNECT_CHANNEL(ch, xpcUnregistering,
+ &irq_flags);
+ }
+
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+ xpc_msgqueue_deref(ch);
+ xpc_part_deref(part);
+ }
+ }
+
+ xpc_disconnect_wait(ch_number);
+}
+
+
+/*
+ * To disconnect a channel, and reflect it back to all who may be waiting.
+ *
+ * An OPEN is not allowed until XPC_C_DISCONNECTING is cleared by
+ * xpc_process_disconnect(), and if set, XPC_C_WDISCONNECT is cleared by
+ * xpc_disconnect_wait().
+ *
+ * THE CHANNEL IS TO BE LOCKED BY THE CALLER AND WILL REMAIN LOCKED UPON RETURN.
+ */
+void
+xpc_disconnect_channel(const int line, struct xpc_channel *ch,
+ enum xpc_retval reason, unsigned long *irq_flags)
+{
+ u32 channel_was_connected = (ch->flags & XPC_C_CONNECTED);
+
+
+ DBUG_ON(!spin_is_locked(&ch->lock));
+
+ if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED)) {
+ return;
+ }
+ DBUG_ON(!(ch->flags & (XPC_C_CONNECTING | XPC_C_CONNECTED)));
+
+ dev_dbg(xpc_chan, "reason=%d, line=%d, partid=%d, channel=%d\n",
+ reason, line, ch->partid, ch->number);
+
+ XPC_SET_REASON(ch, reason, line);
+
+ ch->flags |= (XPC_C_CLOSEREQUEST | XPC_C_DISCONNECTING);
+ /* some of these may not have been set */
+ ch->flags &= ~(XPC_C_OPENREQUEST | XPC_C_OPENREPLY |
+ XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY |
+ XPC_C_CONNECTING | XPC_C_CONNECTED);
+
+ xpc_IPI_send_closerequest(ch, irq_flags);
+
+ if (channel_was_connected) {
+ ch->flags |= XPC_C_WASCONNECTED;
+ }
+
+ spin_unlock_irqrestore(&ch->lock, *irq_flags);
+
+ /* wake all idle kthreads so they can exit */
+ if (atomic_read(&ch->kthreads_idle) > 0) {
+ wake_up_all(&ch->idle_wq);
+
+ } else if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
+ !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
+ /* start a kthread that will do the xpcDisconnecting callout */
+ xpc_create_kthreads(ch, 1, 1);
+ }
+
+ /* wake those waiting to allocate an entry from the local msg queue */
+ if (atomic_read(&ch->n_on_msg_allocate_wq) > 0) {
+ wake_up(&ch->msg_allocate_wq);
+ }
+
+ spin_lock_irqsave(&ch->lock, *irq_flags);
+}
+
+
+void
+xpc_disconnect_callout(struct xpc_channel *ch, enum xpc_retval reason)
+{
+ /*
+ * Let the channel's registerer know that the channel is being
+ * disconnected. We don't want to do this if the registerer was never
+ * informed of a connection being made.
+ */
+
+ if (ch->func != NULL) {
+ dev_dbg(xpc_chan, "ch->func() called, reason=%d, partid=%d, "
+ "channel=%d\n", reason, ch->partid, ch->number);
+
+ ch->func(reason, ch->partid, ch->number, NULL, ch->key);
+
+ dev_dbg(xpc_chan, "ch->func() returned, reason=%d, partid=%d, "
+ "channel=%d\n", reason, ch->partid, ch->number);
+ }
+}
+
+
+/*
+ * Wait for a message entry to become available for the specified channel,
+ * but don't wait any longer than 1 jiffy.
+ */
+static enum xpc_retval
+xpc_allocate_msg_wait(struct xpc_channel *ch)
+{
+ enum xpc_retval ret;
+
+
+ if (ch->flags & XPC_C_DISCONNECTING) {
+ DBUG_ON(ch->reason == xpcInterrupted); // >>> Is this true?
+ return ch->reason;
+ }
+
+ atomic_inc(&ch->n_on_msg_allocate_wq);
+ ret = interruptible_sleep_on_timeout(&ch->msg_allocate_wq, 1);
+ atomic_dec(&ch->n_on_msg_allocate_wq);
+
+ if (ch->flags & XPC_C_DISCONNECTING) {
+ ret = ch->reason;
+ DBUG_ON(ch->reason == xpcInterrupted); // >>> Is this true?
+ } else if (ret == 0) {
+ ret = xpcTimeout;
+ } else {
+ ret = xpcInterrupted;
+ }
+
+ return ret;
+}
+
+
+/*
+ * Allocate an entry for a message from the message queue associated with the
+ * specified channel.
+ */
+static enum xpc_retval
+xpc_allocate_msg(struct xpc_channel *ch, u32 flags,
+ struct xpc_msg **address_of_msg)
+{
+ struct xpc_msg *msg;
+ enum xpc_retval ret;
+ s64 put;
+
+
+ /* this reference will be dropped in xpc_send_msg() */
+ xpc_msgqueue_ref(ch);
+
+ if (ch->flags & XPC_C_DISCONNECTING) {
+ xpc_msgqueue_deref(ch);
+ return ch->reason;
+ }
+ if (!(ch->flags & XPC_C_CONNECTED)) {
+ xpc_msgqueue_deref(ch);
+ return xpcNotConnected;
+ }
+
+
+ /*
+ * Get the next available message entry from the local message queue.
+ * If none are available, we'll make sure that we grab the latest
+ * GP values.
+ */
+ ret = xpcTimeout;
+
+ while (1) {
+
+ put = (volatile s64) ch->w_local_GP.put;
+ if (put - (volatile s64) ch->w_remote_GP.get <
+ ch->local_nentries) {
+
+ /* There are available message entries. We need to try
+ * to secure one for ourselves. We'll do this by trying
+ * to increment w_local_GP.put as long as someone else
+ * doesn't beat us to it. If they do, we'll have to
+ * try again.
+ */
+ if (cmpxchg(&ch->w_local_GP.put, put, put + 1) ==
+ put) {
+ /* we got the entry referenced by put */
+ break;
+ }
+ continue; /* try again */
+ }
+
+
+ /*
+ * There aren't any available msg entries at this time.
+ *
+ * In waiting for a message entry to become available,
+ * we set a timeout in case the other side is not
+ * sending completion IPIs. This lets us fake an IPI
+ * that will cause the IPI handler to fetch the latest
+ * GP values as if an IPI was sent by the other side.
+ */
+ if (ret == xpcTimeout) {
+ xpc_IPI_send_local_msgrequest(ch);
+ }
+
+ if (flags & XPC_NOWAIT) {
+ xpc_msgqueue_deref(ch);
+ return xpcNoWait;
+ }
+
+ ret = xpc_allocate_msg_wait(ch);
+ if (ret != xpcInterrupted && ret != xpcTimeout) {
+ xpc_msgqueue_deref(ch);
+ return ret;
+ }
+ }
+
+
+ /* get the message's address and initialize it */
+ msg = (struct xpc_msg *) ((u64) ch->local_msgqueue +
+ (put % ch->local_nentries) * ch->msg_size);
+
+
+ DBUG_ON(msg->flags != 0);
+ msg->number = put;
+
+ dev_dbg(xpc_chan, "w_local_GP.put changed to %ld; msg=0x%p, "
+ "msg_number=%ld, partid=%d, channel=%d\n", put + 1,
+ (void *) msg, msg->number, ch->partid, ch->number);
+
+ *address_of_msg = msg;
+
+ return xpcSuccess;
+}
+
+
+/*
+ * Allocate an entry for a message from the message queue associated with the
+ * specified channel. NOTE that this routine can sleep waiting for a message
+ * entry to become available. To not sleep, pass in the XPC_NOWAIT flag.
+ *
+ * Arguments:
+ *
+ * partid - ID of partition to which the channel is connected.
+ * ch_number - channel #.
+ * flags - see xpc.h for valid flags.
+ * payload - address of the allocated payload area pointer (filled in on
+ * return) in which the user-defined message is constructed.
+ */
+enum xpc_retval
+xpc_initiate_allocate(partid_t partid, int ch_number, u32 flags, void **payload)
+{
+ struct xpc_partition *part = &xpc_partitions[partid];
+ enum xpc_retval ret = xpcUnknownReason;
+ struct xpc_msg *msg = NULL;
+
+
+ DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+ DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
+
+ *payload = NULL;
+
+ if (xpc_part_ref(part)) {
+ ret = xpc_allocate_msg(&part->channels[ch_number], flags, &msg);
+ xpc_part_deref(part);
+
+ if (msg != NULL) {
+ *payload = &msg->payload;
+ }
+ }
+
+ return ret;
+}
+
+
+/*
+ * Now we actually send the messages that are ready to be sent by advancing
+ * the local message queue's Put value and then send an IPI to the recipient
+ * partition.
+ */
+static void
+xpc_send_msgs(struct xpc_channel *ch, s64 initial_put)
+{
+ struct xpc_msg *msg;
+ s64 put = initial_put + 1;
+ int send_IPI = 0;
+
+
+ while (1) {
+
+ while (1) {
+ if (put == (volatile s64) ch->w_local_GP.put) {
+ break;
+ }
+
+ msg = (struct xpc_msg *) ((u64) ch->local_msgqueue +
+ (put % ch->local_nentries) * ch->msg_size);
+
+ if (!(msg->flags & XPC_M_READY)) {
+ break;
+ }
+
+ put++;
+ }
+
+ if (put == initial_put) {
+ /* nothing's changed */
+ break;
+ }
+
+ if (cmpxchg_rel(&ch->local_GP->put, initial_put, put) !=
+ initial_put) {
+ /* someone else beat us to it */
+ DBUG_ON((volatile s64) ch->local_GP->put < initial_put);
+ break;
+ }
+
+ /* we just set the new value of local_GP->put */
+
+ dev_dbg(xpc_chan, "local_GP->put changed to %ld, partid=%d, "
+ "channel=%d\n", put, ch->partid, ch->number);
+
+ send_IPI = 1;
+
+ /*
+ * We need to ensure that the message referenced by
+ * local_GP->put is not XPC_M_READY or that local_GP->put
+ * equals w_local_GP.put, so we'll go have a look.
+ */
+ initial_put = put;
+ }
+
+ if (send_IPI) {
+ xpc_IPI_send_msgrequest(ch);
+ }
+}
+
+
+/*
+ * Common code that does the actual sending of the message by advancing the
+ * local message queue's Put value and sends an IPI to the partition the
+ * message is being sent to.
+ */
+static enum xpc_retval
+xpc_send_msg(struct xpc_channel *ch, struct xpc_msg *msg, u8 notify_type,
+ xpc_notify_func func, void *key)
+{
+ enum xpc_retval ret = xpcSuccess;
+ struct xpc_notify *notify = notify;
+ s64 put, msg_number = msg->number;
+
+
+ DBUG_ON(notify_type == XPC_N_CALL && func == NULL);
+ DBUG_ON((((u64) msg - (u64) ch->local_msgqueue) / ch->msg_size) !=
+ msg_number % ch->local_nentries);
+ DBUG_ON(msg->flags & XPC_M_READY);
+
+ if (ch->flags & XPC_C_DISCONNECTING) {
+ /* drop the reference grabbed in xpc_allocate_msg() */
+ xpc_msgqueue_deref(ch);
+ return ch->reason;
+ }
+
+ if (notify_type != 0) {
+ /*
+ * Tell the remote side to send an ACK interrupt when the
+ * message has been delivered.
+ */
+ msg->flags |= XPC_M_INTERRUPT;
+
+ atomic_inc(&ch->n_to_notify);
+
+ notify = &ch->notify_queue[msg_number % ch->local_nentries];
+ notify->func = func;
+ notify->key = key;
+ notify->type = notify_type;
+
+ // >>> is a mb() needed here?
+
+ if (ch->flags & XPC_C_DISCONNECTING) {
+ /*
+ * An error occurred between our last error check and
+ * this one. We will try to clear the type field from
+ * the notify entry. If we succeed then
+ * xpc_disconnect_channel() didn't already process
+ * the notify entry.
+ */
+ if (cmpxchg(¬ify->type, notify_type, 0) ==
+ notify_type) {
+ atomic_dec(&ch->n_to_notify);
+ ret = ch->reason;
+ }
+
+ /* drop the reference grabbed in xpc_allocate_msg() */
+ xpc_msgqueue_deref(ch);
+ return ret;
+ }
+ }
+
+ msg->flags |= XPC_M_READY;
+
+ /*
+ * The preceding store of msg->flags must occur before the following
+ * load of ch->local_GP->put.
+ */
+ mb();
+
+ /* see if the message is next in line to be sent, if so send it */
+
+ put = ch->local_GP->put;
+ if (put == msg_number) {
+ xpc_send_msgs(ch, put);
+ }
+
+ /* drop the reference grabbed in xpc_allocate_msg() */
+ xpc_msgqueue_deref(ch);
+ return ret;
+}
+
+
+/*
+ * Send a message previously allocated using xpc_initiate_allocate() on the
+ * specified channel connected to the specified partition.
+ *
+ * This routine will not wait for the message to be received, nor will
+ * notification be given when it does happen. Once this routine has returned
+ * the message entry allocated via xpc_initiate_allocate() is no longer
+ * accessable to the caller.
+ *
+ * This routine, although called by users, does not call xpc_part_ref() to
+ * ensure that the partition infrastructure is in place. It relies on the
+ * fact that we called xpc_msgqueue_ref() in xpc_allocate_msg().
+ *
+ * Arguments:
+ *
+ * partid - ID of partition to which the channel is connected.
+ * ch_number - channel # to send message on.
+ * payload - pointer to the payload area allocated via
+ * xpc_initiate_allocate().
+ */
+enum xpc_retval
+xpc_initiate_send(partid_t partid, int ch_number, void *payload)
+{
+ struct xpc_partition *part = &xpc_partitions[partid];
+ struct xpc_msg *msg = XPC_MSG_ADDRESS(payload);
+ enum xpc_retval ret;
+
+
+ dev_dbg(xpc_chan, "msg=0x%p, partid=%d, channel=%d\n", (void *) msg,
+ partid, ch_number);
+
+ DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+ DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
+ DBUG_ON(msg == NULL);
+
+ ret = xpc_send_msg(&part->channels[ch_number], msg, 0, NULL, NULL);
+
+ return ret;
+}
+
+
+/*
+ * Send a message previously allocated using xpc_initiate_allocate on the
+ * specified channel connected to the specified partition.
+ *
+ * This routine will not wait for the message to be sent. Once this routine
+ * has returned the message entry allocated via xpc_initiate_allocate() is no
+ * longer accessable to the caller.
+ *
+ * Once the remote end of the channel has received the message, the function
+ * passed as an argument to xpc_initiate_send_notify() will be called. This
+ * allows the sender to free up or re-use any buffers referenced by the
+ * message, but does NOT mean the message has been processed at the remote
+ * end by a receiver.
+ *
+ * If this routine returns an error, the caller's function will NOT be called.
+ *
+ * This routine, although called by users, does not call xpc_part_ref() to
+ * ensure that the partition infrastructure is in place. It relies on the
+ * fact that we called xpc_msgqueue_ref() in xpc_allocate_msg().
+ *
+ * Arguments:
+ *
+ * partid - ID of partition to which the channel is connected.
+ * ch_number - channel # to send message on.
+ * payload - pointer to the payload area allocated via
+ * xpc_initiate_allocate().
+ * func - function to call with asynchronous notification of message
+ * receipt. THIS FUNCTION MUST BE NON-BLOCKING.
+ * key - user-defined key to be passed to the function when it's called.
+ */
+enum xpc_retval
+xpc_initiate_send_notify(partid_t partid, int ch_number, void *payload,
+ xpc_notify_func func, void *key)
+{
+ struct xpc_partition *part = &xpc_partitions[partid];
+ struct xpc_msg *msg = XPC_MSG_ADDRESS(payload);
+ enum xpc_retval ret;
+
+
+ dev_dbg(xpc_chan, "msg=0x%p, partid=%d, channel=%d\n", (void *) msg,
+ partid, ch_number);
+
+ DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+ DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
+ DBUG_ON(msg == NULL);
+ DBUG_ON(func == NULL);
+
+ ret = xpc_send_msg(&part->channels[ch_number], msg, XPC_N_CALL,
+ func, key);
+ return ret;
+}
+
+
+static struct xpc_msg *
+xpc_pull_remote_msg(struct xpc_channel *ch, s64 get)
+{
+ struct xpc_partition *part = &xpc_partitions[ch->partid];
+ struct xpc_msg *remote_msg, *msg;
+ u32 msg_index, nmsgs;
+ u64 msg_offset;
+ enum xpc_retval ret;
+
+
+ if (mutex_lock_interruptible(&ch->msg_to_pull_mutex) != 0) {
+ /* we were interrupted by a signal */
+ return NULL;
+ }
+
+ while (get >= ch->next_msg_to_pull) {
+
+ /* pull as many messages as are ready and able to be pulled */
+
+ msg_index = ch->next_msg_to_pull % ch->remote_nentries;
+
+ DBUG_ON(ch->next_msg_to_pull >=
+ (volatile s64) ch->w_remote_GP.put);
+ nmsgs = (volatile s64) ch->w_remote_GP.put -
+ ch->next_msg_to_pull;
+ if (msg_index + nmsgs > ch->remote_nentries) {
+ /* ignore the ones that wrap the msg queue for now */
+ nmsgs = ch->remote_nentries - msg_index;
+ }
+
+ msg_offset = msg_index * ch->msg_size;
+ msg = (struct xpc_msg *) ((u64) ch->remote_msgqueue +
+ msg_offset);
+ remote_msg = (struct xpc_msg *) (ch->remote_msgqueue_pa +
+ msg_offset);
+
+ if ((ret = xpc_pull_remote_cachelines(part, msg, remote_msg,
+ nmsgs * ch->msg_size)) != xpcSuccess) {
+
+ dev_dbg(xpc_chan, "failed to pull %d msgs starting with"
+ " msg %ld from partition %d, channel=%d, "
+ "ret=%d\n", nmsgs, ch->next_msg_to_pull,
+ ch->partid, ch->number, ret);
+
+ XPC_DEACTIVATE_PARTITION(part, ret);
+
+ mutex_unlock(&ch->msg_to_pull_mutex);
+ return NULL;
+ }
+
+ mb(); /* >>> this may not be needed, we're not sure */
+
+ ch->next_msg_to_pull += nmsgs;
+ }
+
+ mutex_unlock(&ch->msg_to_pull_mutex);
+
+ /* return the message we were looking for */
+ msg_offset = (get % ch->remote_nentries) * ch->msg_size;
+ msg = (struct xpc_msg *) ((u64) ch->remote_msgqueue + msg_offset);
+
+ return msg;
+}
+
+
+/*
+ * Get a message to be delivered.
+ */
+static struct xpc_msg *
+xpc_get_deliverable_msg(struct xpc_channel *ch)
+{
+ struct xpc_msg *msg = NULL;
+ s64 get;
+
+
+ do {
+ if ((volatile u32) ch->flags & XPC_C_DISCONNECTING) {
+ break;
+ }
+
+ get = (volatile s64) ch->w_local_GP.get;
+ if (get == (volatile s64) ch->w_remote_GP.put) {
+ break;
+ }
+
+ /* There are messages waiting to be pulled and delivered.
+ * We need to try to secure one for ourselves. We'll do this
+ * by trying to increment w_local_GP.get and hope that no one
+ * else beats us to it. If they do, we'll we'll simply have
+ * to try again for the next one.
+ */
+
+ if (cmpxchg(&ch->w_local_GP.get, get, get + 1) == get) {
+ /* we got the entry referenced by get */
+
+ dev_dbg(xpc_chan, "w_local_GP.get changed to %ld, "
+ "partid=%d, channel=%d\n", get + 1,
+ ch->partid, ch->number);
+
+ /* pull the message from the remote partition */
+
+ msg = xpc_pull_remote_msg(ch, get);
+
+ DBUG_ON(msg != NULL && msg->number != get);
+ DBUG_ON(msg != NULL && (msg->flags & XPC_M_DONE));
+ DBUG_ON(msg != NULL && !(msg->flags & XPC_M_READY));
+
+ break;
+ }
+
+ } while (1);
+
+ return msg;
+}
+
+
+/*
+ * Deliver a message to its intended recipient.
+ */
+void
+xpc_deliver_msg(struct xpc_channel *ch)
+{
+ struct xpc_msg *msg;
+
+
+ if ((msg = xpc_get_deliverable_msg(ch)) != NULL) {
+
+ /*
+ * This ref is taken to protect the payload itself from being
+ * freed before the user is finished with it, which the user
+ * indicates by calling xpc_initiate_received().
+ */
+ xpc_msgqueue_ref(ch);
+
+ atomic_inc(&ch->kthreads_active);
+
+ if (ch->func != NULL) {
+ dev_dbg(xpc_chan, "ch->func() called, msg=0x%p, "
+ "msg_number=%ld, partid=%d, channel=%d\n",
+ (void *) msg, msg->number, ch->partid,
+ ch->number);
+
+ /* deliver the message to its intended recipient */
+ ch->func(xpcMsgReceived, ch->partid, ch->number,
+ &msg->payload, ch->key);
+
+ dev_dbg(xpc_chan, "ch->func() returned, msg=0x%p, "
+ "msg_number=%ld, partid=%d, channel=%d\n",
+ (void *) msg, msg->number, ch->partid,
+ ch->number);
+ }
+
+ atomic_dec(&ch->kthreads_active);
+ }
+}
+
+
+/*
+ * Now we actually acknowledge the messages that have been delivered and ack'd
+ * by advancing the cached remote message queue's Get value and if requested
+ * send an IPI to the message sender's partition.
+ */
+static void
+xpc_acknowledge_msgs(struct xpc_channel *ch, s64 initial_get, u8 msg_flags)
+{
+ struct xpc_msg *msg;
+ s64 get = initial_get + 1;
+ int send_IPI = 0;
+
+
+ while (1) {
+
+ while (1) {
+ if (get == (volatile s64) ch->w_local_GP.get) {
+ break;
+ }
+
+ msg = (struct xpc_msg *) ((u64) ch->remote_msgqueue +
+ (get % ch->remote_nentries) * ch->msg_size);
+
+ if (!(msg->flags & XPC_M_DONE)) {
+ break;
+ }
+
+ msg_flags |= msg->flags;
+ get++;
+ }
+
+ if (get == initial_get) {
+ /* nothing's changed */
+ break;
+ }
+
+ if (cmpxchg_rel(&ch->local_GP->get, initial_get, get) !=
+ initial_get) {
+ /* someone else beat us to it */
+ DBUG_ON((volatile s64) ch->local_GP->get <=
+ initial_get);
+ break;
+ }
+
+ /* we just set the new value of local_GP->get */
+
+ dev_dbg(xpc_chan, "local_GP->get changed to %ld, partid=%d, "
+ "channel=%d\n", get, ch->partid, ch->number);
+
+ send_IPI = (msg_flags & XPC_M_INTERRUPT);
+
+ /*
+ * We need to ensure that the message referenced by
+ * local_GP->get is not XPC_M_DONE or that local_GP->get
+ * equals w_local_GP.get, so we'll go have a look.
+ */
+ initial_get = get;
+ }
+
+ if (send_IPI) {
+ xpc_IPI_send_msgrequest(ch);
+ }
+}
+
+
+/*
+ * Acknowledge receipt of a delivered message.
+ *
+ * If a message has XPC_M_INTERRUPT set, send an interrupt to the partition
+ * that sent the message.
+ *
+ * This function, although called by users, does not call xpc_part_ref() to
+ * ensure that the partition infrastructure is in place. It relies on the
+ * fact that we called xpc_msgqueue_ref() in xpc_deliver_msg().
+ *
+ * Arguments:
+ *
+ * partid - ID of partition to which the channel is connected.
+ * ch_number - channel # message received on.
+ * payload - pointer to the payload area allocated via
+ * xpc_initiate_allocate().
+ */
+void
+xpc_initiate_received(partid_t partid, int ch_number, void *payload)
+{
+ struct xpc_partition *part = &xpc_partitions[partid];
+ struct xpc_channel *ch;
+ struct xpc_msg *msg = XPC_MSG_ADDRESS(payload);
+ s64 get, msg_number = msg->number;
+
+
+ DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+ DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
+
+ ch = &part->channels[ch_number];
+
+ dev_dbg(xpc_chan, "msg=0x%p, msg_number=%ld, partid=%d, channel=%d\n",
+ (void *) msg, msg_number, ch->partid, ch->number);
+
+ DBUG_ON((((u64) msg - (u64) ch->remote_msgqueue) / ch->msg_size) !=
+ msg_number % ch->remote_nentries);
+ DBUG_ON(msg->flags & XPC_M_DONE);
+
+ msg->flags |= XPC_M_DONE;
+
+ /*
+ * The preceding store of msg->flags must occur before the following
+ * load of ch->local_GP->get.
+ */
+ mb();
+
+ /*
+ * See if this message is next in line to be acknowledged as having
+ * been delivered.
+ */
+ get = ch->local_GP->get;
+ if (get == msg_number) {
+ xpc_acknowledge_msgs(ch, get, msg->flags);
+ }
+
+ /* the call to xpc_msgqueue_ref() was done by xpc_deliver_msg() */
+ xpc_msgqueue_deref(ch);
+}
+
--- /dev/null
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
+ */
+
+
+/*
+ * Cross Partition Communication (XPC) support - standard version.
+ *
+ * XPC provides a message passing capability that crosses partition
+ * boundaries. This module is made up of two parts:
+ *
+ * partition This part detects the presence/absence of other
+ * partitions. It provides a heartbeat and monitors
+ * the heartbeats of other partitions.
+ *
+ * channel This part manages the channels and sends/receives
+ * messages across them to/from other partitions.
+ *
+ * There are a couple of additional functions residing in XP, which
+ * provide an interface to XPC for its users.
+ *
+ *
+ * Caveats:
+ *
+ * . We currently have no way to determine which nasid an IPI came
+ * from. Thus, xpc_IPI_send() does a remote AMO write followed by
+ * an IPI. The AMO indicates where data is to be pulled from, so
+ * after the IPI arrives, the remote partition checks the AMO word.
+ * The IPI can actually arrive before the AMO however, so other code
+ * must periodically check for this case. Also, remote AMO operations
+ * do not reliably time out. Thus we do a remote PIO read solely to
+ * know whether the remote partition is down and whether we should
+ * stop sending IPIs to it. This remote PIO read operation is set up
+ * in a special nofault region so SAL knows to ignore (and cleanup)
+ * any errors due to the remote AMO write, PIO read, and/or PIO
+ * write operations.
+ *
+ * If/when new hardware solves this IPI problem, we should abandon
+ * the current approach.
+ *
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/syscalls.h>
+#include <linux/cache.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/completion.h>
+#include <linux/kdebug.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/sn_sal.h>
+#include <asm/uaccess.h>
+#include "xpc.h"
+
+
+/* define two XPC debug device structures to be used with dev_dbg() et al */
+
+struct device_driver xpc_dbg_name = {
+ .name = "xpc"
+};
+
+struct device xpc_part_dbg_subname = {
+ .bus_id = {0}, /* set to "part" at xpc_init() time */
+ .driver = &xpc_dbg_name
+};
+
+struct device xpc_chan_dbg_subname = {
+ .bus_id = {0}, /* set to "chan" at xpc_init() time */
+ .driver = &xpc_dbg_name
+};
+
+struct device *xpc_part = &xpc_part_dbg_subname;
+struct device *xpc_chan = &xpc_chan_dbg_subname;
+
+
+static int xpc_kdebug_ignore;
+
+
+/* systune related variables for /proc/sys directories */
+
+static int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL;
+static int xpc_hb_min_interval = 1;
+static int xpc_hb_max_interval = 10;
+
+static int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_INTERVAL;
+static int xpc_hb_check_min_interval = 10;
+static int xpc_hb_check_max_interval = 120;
+
+int xpc_disengage_request_timelimit = XPC_DISENGAGE_REQUEST_DEFAULT_TIMELIMIT;
+static int xpc_disengage_request_min_timelimit = 0;
+static int xpc_disengage_request_max_timelimit = 120;
+
+static ctl_table xpc_sys_xpc_hb_dir[] = {
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "hb_interval",
+ .data = &xpc_hb_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &xpc_hb_min_interval,
+ .extra2 = &xpc_hb_max_interval
+ },
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "hb_check_interval",
+ .data = &xpc_hb_check_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &xpc_hb_check_min_interval,
+ .extra2 = &xpc_hb_check_max_interval
+ },
+ {}
+};
+static ctl_table xpc_sys_xpc_dir[] = {
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "hb",
+ .mode = 0555,
+ .child = xpc_sys_xpc_hb_dir
+ },
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "disengage_request_timelimit",
+ .data = &xpc_disengage_request_timelimit,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &xpc_disengage_request_min_timelimit,
+ .extra2 = &xpc_disengage_request_max_timelimit
+ },
+ {}
+};
+static ctl_table xpc_sys_dir[] = {
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "xpc",
+ .mode = 0555,
+ .child = xpc_sys_xpc_dir
+ },
+ {}
+};
+static struct ctl_table_header *xpc_sysctl;
+
+/* non-zero if any remote partition disengage request was timed out */
+int xpc_disengage_request_timedout;
+
+/* #of IRQs received */
+static atomic_t xpc_act_IRQ_rcvd;
+
+/* IRQ handler notifies this wait queue on receipt of an IRQ */
+static DECLARE_WAIT_QUEUE_HEAD(xpc_act_IRQ_wq);
+
+static unsigned long xpc_hb_check_timeout;
+
+/* notification that the xpc_hb_checker thread has exited */
+static DECLARE_COMPLETION(xpc_hb_checker_exited);
+
+/* notification that the xpc_discovery thread has exited */
+static DECLARE_COMPLETION(xpc_discovery_exited);
+
+
+static struct timer_list xpc_hb_timer;
+
+
+static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *);
+
+
+static int xpc_system_reboot(struct notifier_block *, unsigned long, void *);
+static struct notifier_block xpc_reboot_notifier = {
+ .notifier_call = xpc_system_reboot,
+};
+
+static int xpc_system_die(struct notifier_block *, unsigned long, void *);
+static struct notifier_block xpc_die_notifier = {
+ .notifier_call = xpc_system_die,
+};
+
+
+/*
+ * Timer function to enforce the timelimit on the partition disengage request.
+ */
+static void
+xpc_timeout_partition_disengage_request(unsigned long data)
+{
+ struct xpc_partition *part = (struct xpc_partition *) data;
+
+
+ DBUG_ON(time_before(jiffies, part->disengage_request_timeout));
+
+ (void) xpc_partition_disengaged(part);
+
+ DBUG_ON(part->disengage_request_timeout != 0);
+ DBUG_ON(xpc_partition_engaged(1UL << XPC_PARTID(part)) != 0);
+}
+
+
+/*
+ * Notify the heartbeat check thread that an IRQ has been received.
+ */
+static irqreturn_t
+xpc_act_IRQ_handler(int irq, void *dev_id)
+{
+ atomic_inc(&xpc_act_IRQ_rcvd);
+ wake_up_interruptible(&xpc_act_IRQ_wq);
+ return IRQ_HANDLED;
+}
+
+
+/*
+ * Timer to produce the heartbeat. The timer structures function is
+ * already set when this is initially called. A tunable is used to
+ * specify when the next timeout should occur.
+ */
+static void
+xpc_hb_beater(unsigned long dummy)
+{
+ xpc_vars->heartbeat++;
+
+ if (time_after_eq(jiffies, xpc_hb_check_timeout)) {
+ wake_up_interruptible(&xpc_act_IRQ_wq);
+ }
+
+ xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ);
+ add_timer(&xpc_hb_timer);
+}
+
+
+/*
+ * This thread is responsible for nearly all of the partition
+ * activation/deactivation.
+ */
+static int
+xpc_hb_checker(void *ignore)
+{
+ int last_IRQ_count = 0;
+ int new_IRQ_count;
+ int force_IRQ=0;
+
+
+ /* this thread was marked active by xpc_hb_init() */
+
+ daemonize(XPC_HB_CHECK_THREAD_NAME);
+
+ set_cpus_allowed(current, cpumask_of_cpu(XPC_HB_CHECK_CPU));
+
+ /* set our heartbeating to other partitions into motion */
+ xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ);
+ xpc_hb_beater(0);
+
+ while (!(volatile int) xpc_exiting) {
+
+ dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have "
+ "been received\n",
+ (int) (xpc_hb_check_timeout - jiffies),
+ atomic_read(&xpc_act_IRQ_rcvd) - last_IRQ_count);
+
+
+ /* checking of remote heartbeats is skewed by IRQ handling */
+ if (time_after_eq(jiffies, xpc_hb_check_timeout)) {
+ dev_dbg(xpc_part, "checking remote heartbeats\n");
+ xpc_check_remote_hb();
+
+ /*
+ * We need to periodically recheck to ensure no
+ * IPI/AMO pairs have been missed. That check
+ * must always reset xpc_hb_check_timeout.
+ */
+ force_IRQ = 1;
+ }
+
+
+ /* check for outstanding IRQs */
+ new_IRQ_count = atomic_read(&xpc_act_IRQ_rcvd);
+ if (last_IRQ_count < new_IRQ_count || force_IRQ != 0) {
+ force_IRQ = 0;
+
+ dev_dbg(xpc_part, "found an IRQ to process; will be "
+ "resetting xpc_hb_check_timeout\n");
+
+ last_IRQ_count += xpc_identify_act_IRQ_sender();
+ if (last_IRQ_count < new_IRQ_count) {
+ /* retry once to help avoid missing AMO */
+ (void) xpc_identify_act_IRQ_sender();
+ }
+ last_IRQ_count = new_IRQ_count;
+
+ xpc_hb_check_timeout = jiffies +
+ (xpc_hb_check_interval * HZ);
+ }
+
+ /* wait for IRQ or timeout */
+ (void) wait_event_interruptible(xpc_act_IRQ_wq,
+ (last_IRQ_count < atomic_read(&xpc_act_IRQ_rcvd) ||
+ time_after_eq(jiffies, xpc_hb_check_timeout) ||
+ (volatile int) xpc_exiting));
+ }
+
+ dev_dbg(xpc_part, "heartbeat checker is exiting\n");
+
+
+ /* mark this thread as having exited */
+ complete(&xpc_hb_checker_exited);
+ return 0;
+}
+
+
+/*
+ * This thread will attempt to discover other partitions to activate
+ * based on info provided by SAL. This new thread is short lived and
+ * will exit once discovery is complete.
+ */
+static int
+xpc_initiate_discovery(void *ignore)
+{
+ daemonize(XPC_DISCOVERY_THREAD_NAME);
+
+ xpc_discovery();
+
+ dev_dbg(xpc_part, "discovery thread is exiting\n");
+
+ /* mark this thread as having exited */
+ complete(&xpc_discovery_exited);
+ return 0;
+}
+
+
+/*
+ * Establish first contact with the remote partititon. This involves pulling
+ * the XPC per partition variables from the remote partition and waiting for
+ * the remote partition to pull ours.
+ */
+static enum xpc_retval
+xpc_make_first_contact(struct xpc_partition *part)
+{
+ enum xpc_retval ret;
+
+
+ while ((ret = xpc_pull_remote_vars_part(part)) != xpcSuccess) {
+ if (ret != xpcRetry) {
+ XPC_DEACTIVATE_PARTITION(part, ret);
+ return ret;
+ }
+
+ dev_dbg(xpc_chan, "waiting to make first contact with "
+ "partition %d\n", XPC_PARTID(part));
+
+ /* wait a 1/4 of a second or so */
+ (void) msleep_interruptible(250);
+
+ if (part->act_state == XPC_P_DEACTIVATING) {
+ return part->reason;
+ }
+ }
+
+ return xpc_mark_partition_active(part);
+}
+
+
+/*
+ * The first kthread assigned to a newly activated partition is the one
+ * created by XPC HB with which it calls xpc_partition_up(). XPC hangs on to
+ * that kthread until the partition is brought down, at which time that kthread
+ * returns back to XPC HB. (The return of that kthread will signify to XPC HB
+ * that XPC has dismantled all communication infrastructure for the associated
+ * partition.) This kthread becomes the channel manager for that partition.
+ *
+ * Each active partition has a channel manager, who, besides connecting and
+ * disconnecting channels, will ensure that each of the partition's connected
+ * channels has the required number of assigned kthreads to get the work done.
+ */
+static void
+xpc_channel_mgr(struct xpc_partition *part)
+{
+ while (part->act_state != XPC_P_DEACTIVATING ||
+ atomic_read(&part->nchannels_active) > 0 ||
+ !xpc_partition_disengaged(part)) {
+
+ xpc_process_channel_activity(part);
+
+
+ /*
+ * Wait until we've been requested to activate kthreads or
+ * all of the channel's message queues have been torn down or
+ * a signal is pending.
+ *
+ * The channel_mgr_requests is set to 1 after being awakened,
+ * This is done to prevent the channel mgr from making one pass
+ * through the loop for each request, since he will
+ * be servicing all the requests in one pass. The reason it's
+ * set to 1 instead of 0 is so that other kthreads will know
+ * that the channel mgr is running and won't bother trying to
+ * wake him up.
+ */
+ atomic_dec(&part->channel_mgr_requests);
+ (void) wait_event_interruptible(part->channel_mgr_wq,
+ (atomic_read(&part->channel_mgr_requests) > 0 ||
+ (volatile u64) part->local_IPI_amo != 0 ||
+ ((volatile u8) part->act_state ==
+ XPC_P_DEACTIVATING &&
+ atomic_read(&part->nchannels_active) == 0 &&
+ xpc_partition_disengaged(part))));
+ atomic_set(&part->channel_mgr_requests, 1);
+
+ // >>> Does it need to wakeup periodically as well? In case we
+ // >>> miscalculated the #of kthreads to wakeup or create?
+ }
+}
+
+
+/*
+ * When XPC HB determines that a partition has come up, it will create a new
+ * kthread and that kthread will call this function to attempt to set up the
+ * basic infrastructure used for Cross Partition Communication with the newly
+ * upped partition.
+ *
+ * The kthread that was created by XPC HB and which setup the XPC
+ * infrastructure will remain assigned to the partition until the partition
+ * goes down. At which time the kthread will teardown the XPC infrastructure
+ * and then exit.
+ *
+ * XPC HB will put the remote partition's XPC per partition specific variables
+ * physical address into xpc_partitions[partid].remote_vars_part_pa prior to
+ * calling xpc_partition_up().
+ */
+static void
+xpc_partition_up(struct xpc_partition *part)
+{
+ DBUG_ON(part->channels != NULL);
+
+ dev_dbg(xpc_chan, "activating partition %d\n", XPC_PARTID(part));
+
+ if (xpc_setup_infrastructure(part) != xpcSuccess) {
+ return;
+ }
+
+ /*
+ * The kthread that XPC HB called us with will become the
+ * channel manager for this partition. It will not return
+ * back to XPC HB until the partition's XPC infrastructure
+ * has been dismantled.
+ */
+
+ (void) xpc_part_ref(part); /* this will always succeed */
+
+ if (xpc_make_first_contact(part) == xpcSuccess) {
+ xpc_channel_mgr(part);
+ }
+
+ xpc_part_deref(part);
+
+ xpc_teardown_infrastructure(part);
+}
+
+
+static int
+xpc_activating(void *__partid)
+{
+ partid_t partid = (u64) __partid;
+ struct xpc_partition *part = &xpc_partitions[partid];
+ unsigned long irq_flags;
+ struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
+ int ret;
+
+
+ DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+
+ spin_lock_irqsave(&part->act_lock, irq_flags);
+
+ if (part->act_state == XPC_P_DEACTIVATING) {
+ part->act_state = XPC_P_INACTIVE;
+ spin_unlock_irqrestore(&part->act_lock, irq_flags);
+ part->remote_rp_pa = 0;
+ return 0;
+ }
+
+ /* indicate the thread is activating */
+ DBUG_ON(part->act_state != XPC_P_ACTIVATION_REQ);
+ part->act_state = XPC_P_ACTIVATING;
+
+ XPC_SET_REASON(part, 0, 0);
+ spin_unlock_irqrestore(&part->act_lock, irq_flags);
+
+ dev_dbg(xpc_part, "bringing partition %d up\n", partid);
+
+ daemonize("xpc%02d", partid);
+
+ /*
+ * This thread needs to run at a realtime priority to prevent a
+ * significant performance degradation.
+ */
+ ret = sched_setscheduler(current, SCHED_FIFO, ¶m);
+ if (ret != 0) {
+ dev_warn(xpc_part, "unable to set pid %d to a realtime "
+ "priority, ret=%d\n", current->pid, ret);
+ }
+
+ /* allow this thread and its children to run on any CPU */
+ set_cpus_allowed(current, CPU_MASK_ALL);
+
+ /*
+ * Register the remote partition's AMOs with SAL so it can handle
+ * and cleanup errors within that address range should the remote
+ * partition go down. We don't unregister this range because it is
+ * difficult to tell when outstanding writes to the remote partition
+ * are finished and thus when it is safe to unregister. This should
+ * not result in wasted space in the SAL xp_addr_region table because
+ * we should get the same page for remote_amos_page_pa after module
+ * reloads and system reboots.
+ */
+ if (sn_register_xp_addr_region(part->remote_amos_page_pa,
+ PAGE_SIZE, 1) < 0) {
+ dev_warn(xpc_part, "xpc_partition_up(%d) failed to register "
+ "xp_addr region\n", partid);
+
+ spin_lock_irqsave(&part->act_lock, irq_flags);
+ part->act_state = XPC_P_INACTIVE;
+ XPC_SET_REASON(part, xpcPhysAddrRegFailed, __LINE__);
+ spin_unlock_irqrestore(&part->act_lock, irq_flags);
+ part->remote_rp_pa = 0;
+ return 0;
+ }
+
+ xpc_allow_hb(partid, xpc_vars);
+ xpc_IPI_send_activated(part);
+
+
+ /*
+ * xpc_partition_up() holds this thread and marks this partition as
+ * XPC_P_ACTIVE by calling xpc_hb_mark_active().
+ */
+ (void) xpc_partition_up(part);
+
+ xpc_disallow_hb(partid, xpc_vars);
+ xpc_mark_partition_inactive(part);
+
+ if (part->reason == xpcReactivating) {
+ /* interrupting ourselves results in activating partition */
+ xpc_IPI_send_reactivate(part);
+ }
+
+ return 0;
+}
+
+
+void
+xpc_activate_partition(struct xpc_partition *part)
+{
+ partid_t partid = XPC_PARTID(part);
+ unsigned long irq_flags;
+ pid_t pid;
+
+
+ spin_lock_irqsave(&part->act_lock, irq_flags);
+
+ DBUG_ON(part->act_state != XPC_P_INACTIVE);
+
+ part->act_state = XPC_P_ACTIVATION_REQ;
+ XPC_SET_REASON(part, xpcCloneKThread, __LINE__);
+
+ spin_unlock_irqrestore(&part->act_lock, irq_flags);
+
+ pid = kernel_thread(xpc_activating, (void *) ((u64) partid), 0);
+
+ if (unlikely(pid <= 0)) {
+ spin_lock_irqsave(&part->act_lock, irq_flags);
+ part->act_state = XPC_P_INACTIVE;
+ XPC_SET_REASON(part, xpcCloneKThreadFailed, __LINE__);
+ spin_unlock_irqrestore(&part->act_lock, irq_flags);
+ }
+}
+
+
+/*
+ * Handle the receipt of a SGI_XPC_NOTIFY IRQ by seeing whether the specified
+ * partition actually sent it. Since SGI_XPC_NOTIFY IRQs may be shared by more
+ * than one partition, we use an AMO_t structure per partition to indicate
+ * whether a partition has sent an IPI or not. >>> If it has, then wake up the
+ * associated kthread to handle it.
+ *
+ * All SGI_XPC_NOTIFY IRQs received by XPC are the result of IPIs sent by XPC
+ * running on other partitions.
+ *
+ * Noteworthy Arguments:
+ *
+ * irq - Interrupt ReQuest number. NOT USED.
+ *
+ * dev_id - partid of IPI's potential sender.
+ */
+irqreturn_t
+xpc_notify_IRQ_handler(int irq, void *dev_id)
+{
+ partid_t partid = (partid_t) (u64) dev_id;
+ struct xpc_partition *part = &xpc_partitions[partid];
+
+
+ DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+
+ if (xpc_part_ref(part)) {
+ xpc_check_for_channel_activity(part);
+
+ xpc_part_deref(part);
+ }
+ return IRQ_HANDLED;
+}
+
+
+/*
+ * Check to see if xpc_notify_IRQ_handler() dropped any IPIs on the floor
+ * because the write to their associated IPI amo completed after the IRQ/IPI
+ * was received.
+ */
+void
+xpc_dropped_IPI_check(struct xpc_partition *part)
+{
+ if (xpc_part_ref(part)) {
+ xpc_check_for_channel_activity(part);
+
+ part->dropped_IPI_timer.expires = jiffies +
+ XPC_P_DROPPED_IPI_WAIT;
+ add_timer(&part->dropped_IPI_timer);
+ xpc_part_deref(part);
+ }
+}
+
+
+void
+xpc_activate_kthreads(struct xpc_channel *ch, int needed)
+{
+ int idle = atomic_read(&ch->kthreads_idle);
+ int assigned = atomic_read(&ch->kthreads_assigned);
+ int wakeup;
+
+
+ DBUG_ON(needed <= 0);
+
+ if (idle > 0) {
+ wakeup = (needed > idle) ? idle : needed;
+ needed -= wakeup;
+
+ dev_dbg(xpc_chan, "wakeup %d idle kthreads, partid=%d, "
+ "channel=%d\n", wakeup, ch->partid, ch->number);
+
+ /* only wakeup the requested number of kthreads */
+ wake_up_nr(&ch->idle_wq, wakeup);
+ }
+
+ if (needed <= 0) {
+ return;
+ }
+
+ if (needed + assigned > ch->kthreads_assigned_limit) {
+ needed = ch->kthreads_assigned_limit - assigned;
+ // >>>should never be less than 0
+ if (needed <= 0) {
+ return;
+ }
+ }
+
+ dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n",
+ needed, ch->partid, ch->number);
+
+ xpc_create_kthreads(ch, needed, 0);
+}
+
+
+/*
+ * This function is where XPC's kthreads wait for messages to deliver.
+ */
+static void
+xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch)
+{
+ do {
+ /* deliver messages to their intended recipients */
+
+ while ((volatile s64) ch->w_local_GP.get <
+ (volatile s64) ch->w_remote_GP.put &&
+ !((volatile u32) ch->flags &
+ XPC_C_DISCONNECTING)) {
+ xpc_deliver_msg(ch);
+ }
+
+ if (atomic_inc_return(&ch->kthreads_idle) >
+ ch->kthreads_idle_limit) {
+ /* too many idle kthreads on this channel */
+ atomic_dec(&ch->kthreads_idle);
+ break;
+ }
+
+ dev_dbg(xpc_chan, "idle kthread calling "
+ "wait_event_interruptible_exclusive()\n");
+
+ (void) wait_event_interruptible_exclusive(ch->idle_wq,
+ ((volatile s64) ch->w_local_GP.get <
+ (volatile s64) ch->w_remote_GP.put ||
+ ((volatile u32) ch->flags &
+ XPC_C_DISCONNECTING)));
+
+ atomic_dec(&ch->kthreads_idle);
+
+ } while (!((volatile u32) ch->flags & XPC_C_DISCONNECTING));
+}
+
+
+static int
+xpc_daemonize_kthread(void *args)
+{
+ partid_t partid = XPC_UNPACK_ARG1(args);
+ u16 ch_number = XPC_UNPACK_ARG2(args);
+ struct xpc_partition *part = &xpc_partitions[partid];
+ struct xpc_channel *ch;
+ int n_needed;
+ unsigned long irq_flags;
+
+
+ daemonize("xpc%02dc%d", partid, ch_number);
+
+ dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n",
+ partid, ch_number);
+
+ ch = &part->channels[ch_number];
+
+ if (!(ch->flags & XPC_C_DISCONNECTING)) {
+
+ /* let registerer know that connection has been established */
+
+ spin_lock_irqsave(&ch->lock, irq_flags);
+ if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) {
+ ch->flags |= XPC_C_CONNECTEDCALLOUT;
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+ xpc_connected_callout(ch);
+
+ spin_lock_irqsave(&ch->lock, irq_flags);
+ ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE;
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+ /*
+ * It is possible that while the callout was being
+ * made that the remote partition sent some messages.
+ * If that is the case, we may need to activate
+ * additional kthreads to help deliver them. We only
+ * need one less than total #of messages to deliver.
+ */
+ n_needed = ch->w_remote_GP.put - ch->w_local_GP.get - 1;
+ if (n_needed > 0 &&
+ !(ch->flags & XPC_C_DISCONNECTING)) {
+ xpc_activate_kthreads(ch, n_needed);
+ }
+ } else {
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ }
+
+ xpc_kthread_waitmsgs(part, ch);
+ }
+
+ /* let registerer know that connection is disconnecting */
+
+ spin_lock_irqsave(&ch->lock, irq_flags);
+ if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
+ !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
+ ch->flags |= XPC_C_DISCONNECTINGCALLOUT;
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+ xpc_disconnect_callout(ch, xpcDisconnecting);
+
+ spin_lock_irqsave(&ch->lock, irq_flags);
+ ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE;
+ }
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+ if (atomic_dec_return(&ch->kthreads_assigned) == 0) {
+ if (atomic_dec_return(&part->nchannels_engaged) == 0) {
+ xpc_mark_partition_disengaged(part);
+ xpc_IPI_send_disengage(part);
+ }
+ }
+
+ xpc_msgqueue_deref(ch);
+
+ dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n",
+ partid, ch_number);
+
+ xpc_part_deref(part);
+ return 0;
+}
+
+
+/*
+ * For each partition that XPC has established communications with, there is
+ * a minimum of one kernel thread assigned to perform any operation that
+ * may potentially sleep or block (basically the callouts to the asynchronous
+ * functions registered via xpc_connect()).
+ *
+ * Additional kthreads are created and destroyed by XPC as the workload
+ * demands.
+ *
+ * A kthread is assigned to one of the active channels that exists for a given
+ * partition.
+ */
+void
+xpc_create_kthreads(struct xpc_channel *ch, int needed,
+ int ignore_disconnecting)
+{
+ unsigned long irq_flags;
+ pid_t pid;
+ u64 args = XPC_PACK_ARGS(ch->partid, ch->number);
+ struct xpc_partition *part = &xpc_partitions[ch->partid];
+
+
+ while (needed-- > 0) {
+
+ /*
+ * The following is done on behalf of the newly created
+ * kthread. That kthread is responsible for doing the
+ * counterpart to the following before it exits.
+ */
+ if (ignore_disconnecting) {
+ if (!atomic_inc_not_zero(&ch->kthreads_assigned)) {
+ /* kthreads assigned had gone to zero */
+ BUG_ON(!(ch->flags &
+ XPC_C_DISCONNECTINGCALLOUT_MADE));
+ break;
+ }
+
+ } else if (ch->flags & XPC_C_DISCONNECTING) {
+ break;
+
+ } else if (atomic_inc_return(&ch->kthreads_assigned) == 1) {
+ if (atomic_inc_return(&part->nchannels_engaged) == 1)
+ xpc_mark_partition_engaged(part);
+ }
+ (void) xpc_part_ref(part);
+ xpc_msgqueue_ref(ch);
+
+ pid = kernel_thread(xpc_daemonize_kthread, (void *) args, 0);
+ if (pid < 0) {
+ /* the fork failed */
+
+ /*
+ * NOTE: if (ignore_disconnecting &&
+ * !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) is true,
+ * then we'll deadlock if all other kthreads assigned
+ * to this channel are blocked in the channel's
+ * registerer, because the only thing that will unblock
+ * them is the xpcDisconnecting callout that this
+ * failed kernel_thread would have made.
+ */
+
+ if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
+ atomic_dec_return(&part->nchannels_engaged) == 0) {
+ xpc_mark_partition_disengaged(part);
+ xpc_IPI_send_disengage(part);
+ }
+ xpc_msgqueue_deref(ch);
+ xpc_part_deref(part);
+
+ if (atomic_read(&ch->kthreads_assigned) <
+ ch->kthreads_idle_limit) {
+ /*
+ * Flag this as an error only if we have an
+ * insufficient #of kthreads for the channel
+ * to function.
+ */
+ spin_lock_irqsave(&ch->lock, irq_flags);
+ XPC_DISCONNECT_CHANNEL(ch, xpcLackOfResources,
+ &irq_flags);
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+ }
+ break;
+ }
+
+ ch->kthreads_created++; // >>> temporary debug only!!!
+ }
+}
+
+
+void
+xpc_disconnect_wait(int ch_number)
+{
+ unsigned long irq_flags;
+ partid_t partid;
+ struct xpc_partition *part;
+ struct xpc_channel *ch;
+ int wakeup_channel_mgr;
+
+
+ /* now wait for all callouts to the caller's function to cease */
+ for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+ part = &xpc_partitions[partid];
+
+ if (!xpc_part_ref(part)) {
+ continue;
+ }
+
+ ch = &part->channels[ch_number];
+
+ if (!(ch->flags & XPC_C_WDISCONNECT)) {
+ xpc_part_deref(part);
+ continue;
+ }
+
+ wait_for_completion(&ch->wdisconnect_wait);
+
+ spin_lock_irqsave(&ch->lock, irq_flags);
+ DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));
+ wakeup_channel_mgr = 0;
+
+ if (ch->delayed_IPI_flags) {
+ if (part->act_state != XPC_P_DEACTIVATING) {
+ spin_lock(&part->IPI_lock);
+ XPC_SET_IPI_FLAGS(part->local_IPI_amo,
+ ch->number, ch->delayed_IPI_flags);
+ spin_unlock(&part->IPI_lock);
+ wakeup_channel_mgr = 1;
+ }
+ ch->delayed_IPI_flags = 0;
+ }
+
+ ch->flags &= ~XPC_C_WDISCONNECT;
+ spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+ if (wakeup_channel_mgr) {
+ xpc_wakeup_channel_mgr(part);
+ }
+
+ xpc_part_deref(part);
+ }
+}
+
+
+static void
+xpc_do_exit(enum xpc_retval reason)
+{
+ partid_t partid;
+ int active_part_count, printed_waiting_msg = 0;
+ struct xpc_partition *part;
+ unsigned long printmsg_time, disengage_request_timeout = 0;
+
+
+ /* a 'rmmod XPC' and a 'reboot' cannot both end up here together */
+ DBUG_ON(xpc_exiting == 1);
+
+ /*
+ * Let the heartbeat checker thread and the discovery thread
+ * (if one is running) know that they should exit. Also wake up
+ * the heartbeat checker thread in case it's sleeping.
+ */
+ xpc_exiting = 1;
+ wake_up_interruptible(&xpc_act_IRQ_wq);
+
+ /* ignore all incoming interrupts */
+ free_irq(SGI_XPC_ACTIVATE, NULL);
+
+ /* wait for the discovery thread to exit */
+ wait_for_completion(&xpc_discovery_exited);
+
+ /* wait for the heartbeat checker thread to exit */
+ wait_for_completion(&xpc_hb_checker_exited);
+
+
+ /* sleep for a 1/3 of a second or so */
+ (void) msleep_interruptible(300);
+
+
+ /* wait for all partitions to become inactive */
+
+ printmsg_time = jiffies + (XPC_DISENGAGE_PRINTMSG_INTERVAL * HZ);
+ xpc_disengage_request_timedout = 0;
+
+ do {
+ active_part_count = 0;
+
+ for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+ part = &xpc_partitions[partid];
+
+ if (xpc_partition_disengaged(part) &&
+ part->act_state == XPC_P_INACTIVE) {
+ continue;
+ }
+
+ active_part_count++;
+
+ XPC_DEACTIVATE_PARTITION(part, reason);
+
+ if (part->disengage_request_timeout >
+ disengage_request_timeout) {
+ disengage_request_timeout =
+ part->disengage_request_timeout;
+ }
+ }
+
+ if (xpc_partition_engaged(-1UL)) {
+ if (time_after(jiffies, printmsg_time)) {
+ dev_info(xpc_part, "waiting for remote "
+ "partitions to disengage, timeout in "
+ "%ld seconds\n",
+ (disengage_request_timeout - jiffies)
+ / HZ);
+ printmsg_time = jiffies +
+ (XPC_DISENGAGE_PRINTMSG_INTERVAL * HZ);
+ printed_waiting_msg = 1;
+ }
+
+ } else if (active_part_count > 0) {
+ if (printed_waiting_msg) {
+ dev_info(xpc_part, "waiting for local partition"
+ " to disengage\n");
+ printed_waiting_msg = 0;
+ }
+
+ } else {
+ if (!xpc_disengage_request_timedout) {
+ dev_info(xpc_part, "all partitions have "
+ "disengaged\n");
+ }
+ break;
+ }
+
+ /* sleep for a 1/3 of a second or so */
+ (void) msleep_interruptible(300);
+
+ } while (1);
+
+ DBUG_ON(xpc_partition_engaged(-1UL));
+
+
+ /* indicate to others that our reserved page is uninitialized */
+ xpc_rsvd_page->vars_pa = 0;
+
+ /* now it's time to eliminate our heartbeat */
+ del_timer_sync(&xpc_hb_timer);
+ DBUG_ON(xpc_vars->heartbeating_to_mask != 0);
+
+ if (reason == xpcUnloading) {
+ /* take ourselves off of the reboot_notifier_list */
+ (void) unregister_reboot_notifier(&xpc_reboot_notifier);
+
+ /* take ourselves off of the die_notifier list */
+ (void) unregister_die_notifier(&xpc_die_notifier);
+ }
+
+ /* close down protections for IPI operations */
+ xpc_restrict_IPI_ops();
+
+
+ /* clear the interface to XPC's functions */
+ xpc_clear_interface();
+
+ if (xpc_sysctl) {
+ unregister_sysctl_table(xpc_sysctl);
+ }
+
+ kfree(xpc_remote_copy_buffer_base);
+}
+
+
+/*
+ * This function is called when the system is being rebooted.
+ */
+static int
+xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused)
+{
+ enum xpc_retval reason;
+
+
+ switch (event) {
+ case SYS_RESTART:
+ reason = xpcSystemReboot;
+ break;
+ case SYS_HALT:
+ reason = xpcSystemHalt;
+ break;
+ case SYS_POWER_OFF:
+ reason = xpcSystemPoweroff;
+ break;
+ default:
+ reason = xpcSystemGoingDown;
+ }
+
+ xpc_do_exit(reason);
+ return NOTIFY_DONE;
+}
+
+
+/*
+ * Notify other partitions to disengage from all references to our memory.
+ */
+static void
+xpc_die_disengage(void)
+{
+ struct xpc_partition *part;
+ partid_t partid;
+ unsigned long engaged;
+ long time, printmsg_time, disengage_request_timeout;
+
+
+ /* keep xpc_hb_checker thread from doing anything (just in case) */
+ xpc_exiting = 1;
+
+ xpc_vars->heartbeating_to_mask = 0; /* indicate we're deactivated */
+
+ for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+ part = &xpc_partitions[partid];
+
+ if (!XPC_SUPPORTS_DISENGAGE_REQUEST(part->
+ remote_vars_version)) {
+
+ /* just in case it was left set by an earlier XPC */
+ xpc_clear_partition_engaged(1UL << partid);
+ continue;
+ }
+
+ if (xpc_partition_engaged(1UL << partid) ||
+ part->act_state != XPC_P_INACTIVE) {
+ xpc_request_partition_disengage(part);
+ xpc_mark_partition_disengaged(part);
+ xpc_IPI_send_disengage(part);
+ }
+ }
+
+ time = rtc_time();
+ printmsg_time = time +
+ (XPC_DISENGAGE_PRINTMSG_INTERVAL * sn_rtc_cycles_per_second);
+ disengage_request_timeout = time +
+ (xpc_disengage_request_timelimit * sn_rtc_cycles_per_second);
+
+ /* wait for all other partitions to disengage from us */
+
+ while (1) {
+ engaged = xpc_partition_engaged(-1UL);
+ if (!engaged) {
+ dev_info(xpc_part, "all partitions have disengaged\n");
+ break;
+ }
+
+ time = rtc_time();
+ if (time >= disengage_request_timeout) {
+ for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+ if (engaged & (1UL << partid)) {
+ dev_info(xpc_part, "disengage from "
+ "remote partition %d timed "
+ "out\n", partid);
+ }
+ }
+ break;
+ }
+
+ if (time >= printmsg_time) {
+ dev_info(xpc_part, "waiting for remote partitions to "
+ "disengage, timeout in %ld seconds\n",
+ (disengage_request_timeout - time) /
+ sn_rtc_cycles_per_second);
+ printmsg_time = time +
+ (XPC_DISENGAGE_PRINTMSG_INTERVAL *
+ sn_rtc_cycles_per_second);
+ }
+ }
+}
+
+
+/*
+ * This function is called when the system is being restarted or halted due
+ * to some sort of system failure. If this is the case we need to notify the
+ * other partitions to disengage from all references to our memory.
+ * This function can also be called when our heartbeater could be offlined
+ * for a time. In this case we need to notify other partitions to not worry
+ * about the lack of a heartbeat.
+ */
+static int
+xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused)
+{
+ switch (event) {
+ case DIE_MACHINE_RESTART:
+ case DIE_MACHINE_HALT:
+ xpc_die_disengage();
+ break;
+
+ case DIE_KDEBUG_ENTER:
+ /* Should lack of heartbeat be ignored by other partitions? */
+ if (!xpc_kdebug_ignore) {
+ break;
+ }
+ /* fall through */
+ case DIE_MCA_MONARCH_ENTER:
+ case DIE_INIT_MONARCH_ENTER:
+ xpc_vars->heartbeat++;
+ xpc_vars->heartbeat_offline = 1;
+ break;
+
+ case DIE_KDEBUG_LEAVE:
+ /* Is lack of heartbeat being ignored by other partitions? */
+ if (!xpc_kdebug_ignore) {
+ break;
+ }
+ /* fall through */
+ case DIE_MCA_MONARCH_LEAVE:
+ case DIE_INIT_MONARCH_LEAVE:
+ xpc_vars->heartbeat++;
+ xpc_vars->heartbeat_offline = 0;
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+
+int __init
+xpc_init(void)
+{
+ int ret;
+ partid_t partid;
+ struct xpc_partition *part;
+ pid_t pid;
+ size_t buf_size;
+
+
+ if (!ia64_platform_is("sn2")) {
+ return -ENODEV;
+ }
+
+
+ buf_size = max(XPC_RP_VARS_SIZE,
+ XPC_RP_HEADER_SIZE + XP_NASID_MASK_BYTES);
+ xpc_remote_copy_buffer = xpc_kmalloc_cacheline_aligned(buf_size,
+ GFP_KERNEL, &xpc_remote_copy_buffer_base);
+ if (xpc_remote_copy_buffer == NULL)
+ return -ENOMEM;
+
+ snprintf(xpc_part->bus_id, BUS_ID_SIZE, "part");
+ snprintf(xpc_chan->bus_id, BUS_ID_SIZE, "chan");
+
+ xpc_sysctl = register_sysctl_table(xpc_sys_dir);
+
+ /*
+ * The first few fields of each entry of xpc_partitions[] need to
+ * be initialized now so that calls to xpc_connect() and
+ * xpc_disconnect() can be made prior to the activation of any remote
+ * partition. NOTE THAT NONE OF THE OTHER FIELDS BELONGING TO THESE
+ * ENTRIES ARE MEANINGFUL UNTIL AFTER AN ENTRY'S CORRESPONDING
+ * PARTITION HAS BEEN ACTIVATED.
+ */
+ for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+ part = &xpc_partitions[partid];
+
+ DBUG_ON((u64) part != L1_CACHE_ALIGN((u64) part));
+
+ part->act_IRQ_rcvd = 0;
+ spin_lock_init(&part->act_lock);
+ part->act_state = XPC_P_INACTIVE;
+ XPC_SET_REASON(part, 0, 0);
+
+ init_timer(&part->disengage_request_timer);
+ part->disengage_request_timer.function =
+ xpc_timeout_partition_disengage_request;
+ part->disengage_request_timer.data = (unsigned long) part;
+
+ part->setup_state = XPC_P_UNSET;
+ init_waitqueue_head(&part->teardown_wq);
+ atomic_set(&part->references, 0);
+ }
+
+ /*
+ * Open up protections for IPI operations (and AMO operations on
+ * Shub 1.1 systems).
+ */
+ xpc_allow_IPI_ops();
+
+ /*
+ * Interrupts being processed will increment this atomic variable and
+ * awaken the heartbeat thread which will process the interrupts.
+ */
+ atomic_set(&xpc_act_IRQ_rcvd, 0);
+
+ /*
+ * This is safe to do before the xpc_hb_checker thread has started
+ * because the handler releases a wait queue. If an interrupt is
+ * received before the thread is waiting, it will not go to sleep,
+ * but rather immediately process the interrupt.
+ */
+ ret = request_irq(SGI_XPC_ACTIVATE, xpc_act_IRQ_handler, 0,
+ "xpc hb", NULL);
+ if (ret != 0) {
+ dev_err(xpc_part, "can't register ACTIVATE IRQ handler, "
+ "errno=%d\n", -ret);
+
+ xpc_restrict_IPI_ops();
+
+ if (xpc_sysctl) {
+ unregister_sysctl_table(xpc_sysctl);
+ }
+
+ kfree(xpc_remote_copy_buffer_base);
+ return -EBUSY;
+ }
+
+ /*
+ * Fill the partition reserved page with the information needed by
+ * other partitions to discover we are alive and establish initial
+ * communications.
+ */
+ xpc_rsvd_page = xpc_rsvd_page_init();
+ if (xpc_rsvd_page == NULL) {
+ dev_err(xpc_part, "could not setup our reserved page\n");
+
+ free_irq(SGI_XPC_ACTIVATE, NULL);
+ xpc_restrict_IPI_ops();
+
+ if (xpc_sysctl) {
+ unregister_sysctl_table(xpc_sysctl);
+ }
+
+ kfree(xpc_remote_copy_buffer_base);
+ return -EBUSY;
+ }
+
+
+ /* add ourselves to the reboot_notifier_list */
+ ret = register_reboot_notifier(&xpc_reboot_notifier);
+ if (ret != 0) {
+ dev_warn(xpc_part, "can't register reboot notifier\n");
+ }
+
+ /* add ourselves to the die_notifier list */
+ ret = register_die_notifier(&xpc_die_notifier);
+ if (ret != 0) {
+ dev_warn(xpc_part, "can't register die notifier\n");
+ }
+
+ init_timer(&xpc_hb_timer);
+ xpc_hb_timer.function = xpc_hb_beater;
+
+ /*
+ * The real work-horse behind xpc. This processes incoming
+ * interrupts and monitors remote heartbeats.
+ */
+ pid = kernel_thread(xpc_hb_checker, NULL, 0);
+ if (pid < 0) {
+ dev_err(xpc_part, "failed while forking hb check thread\n");
+
+ /* indicate to others that our reserved page is uninitialized */
+ xpc_rsvd_page->vars_pa = 0;
+
+ /* take ourselves off of the reboot_notifier_list */
+ (void) unregister_reboot_notifier(&xpc_reboot_notifier);
+
+ /* take ourselves off of the die_notifier list */
+ (void) unregister_die_notifier(&xpc_die_notifier);
+
+ del_timer_sync(&xpc_hb_timer);
+ free_irq(SGI_XPC_ACTIVATE, NULL);
+ xpc_restrict_IPI_ops();
+
+ if (xpc_sysctl) {
+ unregister_sysctl_table(xpc_sysctl);
+ }
+
+ kfree(xpc_remote_copy_buffer_base);
+ return -EBUSY;
+ }
+
+
+ /*
+ * Startup a thread that will attempt to discover other partitions to
+ * activate based on info provided by SAL. This new thread is short
+ * lived and will exit once discovery is complete.
+ */
+ pid = kernel_thread(xpc_initiate_discovery, NULL, 0);
+ if (pid < 0) {
+ dev_err(xpc_part, "failed while forking discovery thread\n");
+
+ /* mark this new thread as a non-starter */
+ complete(&xpc_discovery_exited);
+
+ xpc_do_exit(xpcUnloading);
+ return -EBUSY;
+ }
+
+
+ /* set the interface to point at XPC's functions */
+ xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect,
+ xpc_initiate_allocate, xpc_initiate_send,
+ xpc_initiate_send_notify, xpc_initiate_received,
+ xpc_initiate_partid_to_nasids);
+
+ return 0;
+}
+module_init(xpc_init);
+
+
+void __exit
+xpc_exit(void)
+{
+ xpc_do_exit(xpcUnloading);
+}
+module_exit(xpc_exit);
+
+
+MODULE_AUTHOR("Silicon Graphics, Inc.");
+MODULE_DESCRIPTION("Cross Partition Communication (XPC) support");
+MODULE_LICENSE("GPL");
+
+module_param(xpc_hb_interval, int, 0);
+MODULE_PARM_DESC(xpc_hb_interval, "Number of seconds between "
+ "heartbeat increments.");
+
+module_param(xpc_hb_check_interval, int, 0);
+MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between "
+ "heartbeat checks.");
+
+module_param(xpc_disengage_request_timelimit, int, 0);
+MODULE_PARM_DESC(xpc_disengage_request_timelimit, "Number of seconds to wait "
+ "for disengage request to complete.");
+
+module_param(xpc_kdebug_ignore, int, 0);
+MODULE_PARM_DESC(xpc_kdebug_ignore, "Should lack of heartbeat be ignored by "
+ "other partitions when dropping into kdebug.");
+
--- /dev/null
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
+ */
+
+
+/*
+ * Cross Partition Communication (XPC) partition support.
+ *
+ * This is the part of XPC that detects the presence/absence of
+ * other partitions. It provides a heartbeat and monitors the
+ * heartbeats of other partitions.
+ *
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/sysctl.h>
+#include <linux/cache.h>
+#include <linux/mmzone.h>
+#include <linux/nodemask.h>
+#include <asm/uncached.h>
+#include <asm/sn/bte.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/sn_sal.h>
+#include <asm/sn/nodepda.h>
+#include <asm/sn/addrs.h>
+#include "xpc.h"
+
+
+/* XPC is exiting flag */
+int xpc_exiting;
+
+
+/* SH_IPI_ACCESS shub register value on startup */
+static u64 xpc_sh1_IPI_access;
+static u64 xpc_sh2_IPI_access0;
+static u64 xpc_sh2_IPI_access1;
+static u64 xpc_sh2_IPI_access2;
+static u64 xpc_sh2_IPI_access3;
+
+
+/* original protection values for each node */
+u64 xpc_prot_vec[MAX_NUMNODES];
+
+
+/* this partition's reserved page pointers */
+struct xpc_rsvd_page *xpc_rsvd_page;
+static u64 *xpc_part_nasids;
+static u64 *xpc_mach_nasids;
+struct xpc_vars *xpc_vars;
+struct xpc_vars_part *xpc_vars_part;
+
+static int xp_nasid_mask_bytes; /* actual size in bytes of nasid mask */
+static int xp_nasid_mask_words; /* actual size in words of nasid mask */
+
+
+/*
+ * For performance reasons, each entry of xpc_partitions[] is cacheline
+ * aligned. And xpc_partitions[] is padded with an additional entry at the
+ * end so that the last legitimate entry doesn't share its cacheline with
+ * another variable.
+ */
+struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1];
+
+
+/*
+ * Generic buffer used to store a local copy of portions of a remote
+ * partition's reserved page (either its header and part_nasids mask,
+ * or its vars).
+ */
+char *xpc_remote_copy_buffer;
+void *xpc_remote_copy_buffer_base;
+
+
+/*
+ * Guarantee that the kmalloc'd memory is cacheline aligned.
+ */
+void *
+xpc_kmalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
+{
+ /* see if kmalloc will give us cachline aligned memory by default */
+ *base = kmalloc(size, flags);
+ if (*base == NULL) {
+ return NULL;
+ }
+ if ((u64) *base == L1_CACHE_ALIGN((u64) *base)) {
+ return *base;
+ }
+ kfree(*base);
+
+ /* nope, we'll have to do it ourselves */
+ *base = kmalloc(size + L1_CACHE_BYTES, flags);
+ if (*base == NULL) {
+ return NULL;
+ }
+ return (void *) L1_CACHE_ALIGN((u64) *base);
+}
+
+
+/*
+ * Given a nasid, get the physical address of the partition's reserved page
+ * for that nasid. This function returns 0 on any error.
+ */
+static u64
+xpc_get_rsvd_page_pa(int nasid)
+{
+ bte_result_t bte_res;
+ s64 status;
+ u64 cookie = 0;
+ u64 rp_pa = nasid; /* seed with nasid */
+ u64 len = 0;
+ u64 buf = buf;
+ u64 buf_len = 0;
+ void *buf_base = NULL;
+
+
+ while (1) {
+
+ status = sn_partition_reserved_page_pa(buf, &cookie, &rp_pa,
+ &len);
+
+ dev_dbg(xpc_part, "SAL returned with status=%li, cookie="
+ "0x%016lx, address=0x%016lx, len=0x%016lx\n",
+ status, cookie, rp_pa, len);
+
+ if (status != SALRET_MORE_PASSES) {
+ break;
+ }
+
+ if (L1_CACHE_ALIGN(len) > buf_len) {
+ kfree(buf_base);
+ buf_len = L1_CACHE_ALIGN(len);
+ buf = (u64) xpc_kmalloc_cacheline_aligned(buf_len,
+ GFP_KERNEL, &buf_base);
+ if (buf_base == NULL) {
+ dev_err(xpc_part, "unable to kmalloc "
+ "len=0x%016lx\n", buf_len);
+ status = SALRET_ERROR;
+ break;
+ }
+ }
+
+ bte_res = xp_bte_copy(rp_pa, buf, buf_len,
+ (BTE_NOTIFY | BTE_WACQUIRE), NULL);
+ if (bte_res != BTE_SUCCESS) {
+ dev_dbg(xpc_part, "xp_bte_copy failed %i\n", bte_res);
+ status = SALRET_ERROR;
+ break;
+ }
+ }
+
+ kfree(buf_base);
+
+ if (status != SALRET_OK) {
+ rp_pa = 0;
+ }
+ dev_dbg(xpc_part, "reserved page at phys address 0x%016lx\n", rp_pa);
+ return rp_pa;
+}
+
+
+/*
+ * Fill the partition reserved page with the information needed by
+ * other partitions to discover we are alive and establish initial
+ * communications.
+ */
+struct xpc_rsvd_page *
+xpc_rsvd_page_init(void)
+{
+ struct xpc_rsvd_page *rp;
+ AMO_t *amos_page;
+ u64 rp_pa, nasid_array = 0;
+ int i, ret;
+
+
+ /* get the local reserved page's address */
+
+ preempt_disable();
+ rp_pa = xpc_get_rsvd_page_pa(cpuid_to_nasid(smp_processor_id()));
+ preempt_enable();
+ if (rp_pa == 0) {
+ dev_err(xpc_part, "SAL failed to locate the reserved page\n");
+ return NULL;
+ }
+ rp = (struct xpc_rsvd_page *) __va(rp_pa);
+
+ if (rp->partid != sn_partition_id) {
+ dev_err(xpc_part, "the reserved page's partid of %d should be "
+ "%d\n", rp->partid, sn_partition_id);
+ return NULL;
+ }
+
+ rp->version = XPC_RP_VERSION;
+
+ /* establish the actual sizes of the nasid masks */
+ if (rp->SAL_version == 1) {
+ /* SAL_version 1 didn't set the nasids_size field */
+ rp->nasids_size = 128;
+ }
+ xp_nasid_mask_bytes = rp->nasids_size;
+ xp_nasid_mask_words = xp_nasid_mask_bytes / 8;
+
+ /* setup the pointers to the various items in the reserved page */
+ xpc_part_nasids = XPC_RP_PART_NASIDS(rp);
+ xpc_mach_nasids = XPC_RP_MACH_NASIDS(rp);
+ xpc_vars = XPC_RP_VARS(rp);
+ xpc_vars_part = XPC_RP_VARS_PART(rp);
+
+ /*
+ * Before clearing xpc_vars, see if a page of AMOs had been previously
+ * allocated. If not we'll need to allocate one and set permissions
+ * so that cross-partition AMOs are allowed.
+ *
+ * The allocated AMO page needs MCA reporting to remain disabled after
+ * XPC has unloaded. To make this work, we keep a copy of the pointer
+ * to this page (i.e., amos_page) in the struct xpc_vars structure,
+ * which is pointed to by the reserved page, and re-use that saved copy
+ * on subsequent loads of XPC. This AMO page is never freed, and its
+ * memory protections are never restricted.
+ */
+ if ((amos_page = xpc_vars->amos_page) == NULL) {
+ amos_page = (AMO_t *) TO_AMO(uncached_alloc_page(0));
+ if (amos_page == NULL) {
+ dev_err(xpc_part, "can't allocate page of AMOs\n");
+ return NULL;
+ }
+
+ /*
+ * Open up AMO-R/W to cpu. This is done for Shub 1.1 systems
+ * when xpc_allow_IPI_ops() is called via xpc_hb_init().
+ */
+ if (!enable_shub_wars_1_1()) {
+ ret = sn_change_memprotect(ia64_tpa((u64) amos_page),
+ PAGE_SIZE, SN_MEMPROT_ACCESS_CLASS_1,
+ &nasid_array);
+ if (ret != 0) {
+ dev_err(xpc_part, "can't change memory "
+ "protections\n");
+ uncached_free_page(__IA64_UNCACHED_OFFSET |
+ TO_PHYS((u64) amos_page));
+ return NULL;
+ }
+ }
+ } else if (!IS_AMO_ADDRESS((u64) amos_page)) {
+ /*
+ * EFI's XPBOOT can also set amos_page in the reserved page,
+ * but it happens to leave it as an uncached physical address
+ * and we need it to be an uncached virtual, so we'll have to
+ * convert it.
+ */
+ if (!IS_AMO_PHYS_ADDRESS((u64) amos_page)) {
+ dev_err(xpc_part, "previously used amos_page address "
+ "is bad = 0x%p\n", (void *) amos_page);
+ return NULL;
+ }
+ amos_page = (AMO_t *) TO_AMO((u64) amos_page);
+ }
+
+ /* clear xpc_vars */
+ memset(xpc_vars, 0, sizeof(struct xpc_vars));
+
+ xpc_vars->version = XPC_V_VERSION;
+ xpc_vars->act_nasid = cpuid_to_nasid(0);
+ xpc_vars->act_phys_cpuid = cpu_physical_id(0);
+ xpc_vars->vars_part_pa = __pa(xpc_vars_part);
+ xpc_vars->amos_page_pa = ia64_tpa((u64) amos_page);
+ xpc_vars->amos_page = amos_page; /* save for next load of XPC */
+
+
+ /* clear xpc_vars_part */
+ memset((u64 *) xpc_vars_part, 0, sizeof(struct xpc_vars_part) *
+ XP_MAX_PARTITIONS);
+
+ /* initialize the activate IRQ related AMO variables */
+ for (i = 0; i < xp_nasid_mask_words; i++) {
+ (void) xpc_IPI_init(XPC_ACTIVATE_IRQ_AMOS + i);
+ }
+
+ /* initialize the engaged remote partitions related AMO variables */
+ (void) xpc_IPI_init(XPC_ENGAGED_PARTITIONS_AMO);
+ (void) xpc_IPI_init(XPC_DISENGAGE_REQUEST_AMO);
+
+ /* timestamp of when reserved page was setup by XPC */
+ rp->stamp = CURRENT_TIME;
+
+ /*
+ * This signifies to the remote partition that our reserved
+ * page is initialized.
+ */
+ rp->vars_pa = __pa(xpc_vars);
+
+ return rp;
+}
+
+
+/*
+ * Change protections to allow IPI operations (and AMO operations on
+ * Shub 1.1 systems).
+ */
+void
+xpc_allow_IPI_ops(void)
+{
+ int node;
+ int nasid;
+
+
+ // >>> Change SH_IPI_ACCESS code to use SAL call once it is available.
+
+ if (is_shub2()) {
+ xpc_sh2_IPI_access0 =
+ (u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS0));
+ xpc_sh2_IPI_access1 =
+ (u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS1));
+ xpc_sh2_IPI_access2 =
+ (u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS2));
+ xpc_sh2_IPI_access3 =
+ (u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS3));
+
+ for_each_online_node(node) {
+ nasid = cnodeid_to_nasid(node);
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
+ -1UL);
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
+ -1UL);
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
+ -1UL);
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
+ -1UL);
+ }
+
+ } else {
+ xpc_sh1_IPI_access =
+ (u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH1_IPI_ACCESS));
+
+ for_each_online_node(node) {
+ nasid = cnodeid_to_nasid(node);
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
+ -1UL);
+
+ /*
+ * Since the BIST collides with memory operations on
+ * SHUB 1.1 sn_change_memprotect() cannot be used.
+ */
+ if (enable_shub_wars_1_1()) {
+ /* open up everything */
+ xpc_prot_vec[node] = (u64) HUB_L((u64 *)
+ GLOBAL_MMR_ADDR(nasid,
+ SH1_MD_DQLP_MMR_DIR_PRIVEC0));
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
+ SH1_MD_DQLP_MMR_DIR_PRIVEC0),
+ -1UL);
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
+ SH1_MD_DQRP_MMR_DIR_PRIVEC0),
+ -1UL);
+ }
+ }
+ }
+}
+
+
+/*
+ * Restrict protections to disallow IPI operations (and AMO operations on
+ * Shub 1.1 systems).
+ */
+void
+xpc_restrict_IPI_ops(void)
+{
+ int node;
+ int nasid;
+
+
+ // >>> Change SH_IPI_ACCESS code to use SAL call once it is available.
+
+ if (is_shub2()) {
+
+ for_each_online_node(node) {
+ nasid = cnodeid_to_nasid(node);
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
+ xpc_sh2_IPI_access0);
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
+ xpc_sh2_IPI_access1);
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
+ xpc_sh2_IPI_access2);
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
+ xpc_sh2_IPI_access3);
+ }
+
+ } else {
+
+ for_each_online_node(node) {
+ nasid = cnodeid_to_nasid(node);
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
+ xpc_sh1_IPI_access);
+
+ if (enable_shub_wars_1_1()) {
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
+ SH1_MD_DQLP_MMR_DIR_PRIVEC0),
+ xpc_prot_vec[node]);
+ HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
+ SH1_MD_DQRP_MMR_DIR_PRIVEC0),
+ xpc_prot_vec[node]);
+ }
+ }
+ }
+}
+
+
+/*
+ * At periodic intervals, scan through all active partitions and ensure
+ * their heartbeat is still active. If not, the partition is deactivated.
+ */
+void
+xpc_check_remote_hb(void)
+{
+ struct xpc_vars *remote_vars;
+ struct xpc_partition *part;
+ partid_t partid;
+ bte_result_t bres;
+
+
+ remote_vars = (struct xpc_vars *) xpc_remote_copy_buffer;
+
+ for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+
+ if (xpc_exiting) {
+ break;
+ }
+
+ if (partid == sn_partition_id) {
+ continue;
+ }
+
+ part = &xpc_partitions[partid];
+
+ if (part->act_state == XPC_P_INACTIVE ||
+ part->act_state == XPC_P_DEACTIVATING) {
+ continue;
+ }
+
+ /* pull the remote_hb cache line */
+ bres = xp_bte_copy(part->remote_vars_pa,
+ (u64) remote_vars,
+ XPC_RP_VARS_SIZE,
+ (BTE_NOTIFY | BTE_WACQUIRE), NULL);
+ if (bres != BTE_SUCCESS) {
+ XPC_DEACTIVATE_PARTITION(part,
+ xpc_map_bte_errors(bres));
+ continue;
+ }
+
+ dev_dbg(xpc_part, "partid = %d, heartbeat = %ld, last_heartbeat"
+ " = %ld, heartbeat_offline = %ld, HB_mask = 0x%lx\n",
+ partid, remote_vars->heartbeat, part->last_heartbeat,
+ remote_vars->heartbeat_offline,
+ remote_vars->heartbeating_to_mask);
+
+ if (((remote_vars->heartbeat == part->last_heartbeat) &&
+ (remote_vars->heartbeat_offline == 0)) ||
+ !xpc_hb_allowed(sn_partition_id, remote_vars)) {
+
+ XPC_DEACTIVATE_PARTITION(part, xpcNoHeartbeat);
+ continue;
+ }
+
+ part->last_heartbeat = remote_vars->heartbeat;
+ }
+}
+
+
+/*
+ * Get a copy of a portion of the remote partition's rsvd page.
+ *
+ * remote_rp points to a buffer that is cacheline aligned for BTE copies and
+ * is large enough to contain a copy of their reserved page header and
+ * part_nasids mask.
+ */
+static enum xpc_retval
+xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
+ struct xpc_rsvd_page *remote_rp, u64 *remote_rp_pa)
+{
+ int bres, i;
+
+
+ /* get the reserved page's physical address */
+
+ *remote_rp_pa = xpc_get_rsvd_page_pa(nasid);
+ if (*remote_rp_pa == 0) {
+ return xpcNoRsvdPageAddr;
+ }
+
+
+ /* pull over the reserved page header and part_nasids mask */
+ bres = xp_bte_copy(*remote_rp_pa, (u64) remote_rp,
+ XPC_RP_HEADER_SIZE + xp_nasid_mask_bytes,
+ (BTE_NOTIFY | BTE_WACQUIRE), NULL);
+ if (bres != BTE_SUCCESS) {
+ return xpc_map_bte_errors(bres);
+ }
+
+
+ if (discovered_nasids != NULL) {
+ u64 *remote_part_nasids = XPC_RP_PART_NASIDS(remote_rp);
+
+
+ for (i = 0; i < xp_nasid_mask_words; i++) {
+ discovered_nasids[i] |= remote_part_nasids[i];
+ }
+ }
+
+
+ /* check that the partid is for another partition */
+
+ if (remote_rp->partid < 1 ||
+ remote_rp->partid > (XP_MAX_PARTITIONS - 1)) {
+ return xpcInvalidPartid;
+ }
+
+ if (remote_rp->partid == sn_partition_id) {
+ return xpcLocalPartid;
+ }
+
+
+ if (XPC_VERSION_MAJOR(remote_rp->version) !=
+ XPC_VERSION_MAJOR(XPC_RP_VERSION)) {
+ return xpcBadVersion;
+ }
+
+ return xpcSuccess;
+}
+
+
+/*
+ * Get a copy of the remote partition's XPC variables from the reserved page.
+ *
+ * remote_vars points to a buffer that is cacheline aligned for BTE copies and
+ * assumed to be of size XPC_RP_VARS_SIZE.
+ */
+static enum xpc_retval
+xpc_get_remote_vars(u64 remote_vars_pa, struct xpc_vars *remote_vars)
+{
+ int bres;
+
+
+ if (remote_vars_pa == 0) {
+ return xpcVarsNotSet;
+ }
+
+ /* pull over the cross partition variables */
+ bres = xp_bte_copy(remote_vars_pa, (u64) remote_vars, XPC_RP_VARS_SIZE,
+ (BTE_NOTIFY | BTE_WACQUIRE), NULL);
+ if (bres != BTE_SUCCESS) {
+ return xpc_map_bte_errors(bres);
+ }
+
+ if (XPC_VERSION_MAJOR(remote_vars->version) !=
+ XPC_VERSION_MAJOR(XPC_V_VERSION)) {
+ return xpcBadVersion;
+ }
+
+ return xpcSuccess;
+}
+
+
+/*
+ * Update the remote partition's info.
+ */
+static void
+xpc_update_partition_info(struct xpc_partition *part, u8 remote_rp_version,
+ struct timespec *remote_rp_stamp, u64 remote_rp_pa,
+ u64 remote_vars_pa, struct xpc_vars *remote_vars)
+{
+ part->remote_rp_version = remote_rp_version;
+ dev_dbg(xpc_part, " remote_rp_version = 0x%016x\n",
+ part->remote_rp_version);
+
+ part->remote_rp_stamp = *remote_rp_stamp;
+ dev_dbg(xpc_part, " remote_rp_stamp (tv_sec = 0x%lx tv_nsec = 0x%lx\n",
+ part->remote_rp_stamp.tv_sec, part->remote_rp_stamp.tv_nsec);
+
+ part->remote_rp_pa = remote_rp_pa;
+ dev_dbg(xpc_part, " remote_rp_pa = 0x%016lx\n", part->remote_rp_pa);
+
+ part->remote_vars_pa = remote_vars_pa;
+ dev_dbg(xpc_part, " remote_vars_pa = 0x%016lx\n",
+ part->remote_vars_pa);
+
+ part->last_heartbeat = remote_vars->heartbeat;
+ dev_dbg(xpc_part, " last_heartbeat = 0x%016lx\n",
+ part->last_heartbeat);
+
+ part->remote_vars_part_pa = remote_vars->vars_part_pa;
+ dev_dbg(xpc_part, " remote_vars_part_pa = 0x%016lx\n",
+ part->remote_vars_part_pa);
+
+ part->remote_act_nasid = remote_vars->act_nasid;
+ dev_dbg(xpc_part, " remote_act_nasid = 0x%x\n",
+ part->remote_act_nasid);
+
+ part->remote_act_phys_cpuid = remote_vars->act_phys_cpuid;
+ dev_dbg(xpc_part, " remote_act_phys_cpuid = 0x%x\n",
+ part->remote_act_phys_cpuid);
+
+ part->remote_amos_page_pa = remote_vars->amos_page_pa;
+ dev_dbg(xpc_part, " remote_amos_page_pa = 0x%lx\n",
+ part->remote_amos_page_pa);
+
+ part->remote_vars_version = remote_vars->version;
+ dev_dbg(xpc_part, " remote_vars_version = 0x%x\n",
+ part->remote_vars_version);
+}
+
+
+/*
+ * Prior code has determined the nasid which generated an IPI. Inspect
+ * that nasid to determine if its partition needs to be activated or
+ * deactivated.
+ *
+ * A partition is consider "awaiting activation" if our partition
+ * flags indicate it is not active and it has a heartbeat. A
+ * partition is considered "awaiting deactivation" if our partition
+ * flags indicate it is active but it has no heartbeat or it is not
+ * sending its heartbeat to us.
+ *
+ * To determine the heartbeat, the remote nasid must have a properly
+ * initialized reserved page.
+ */
+static void
+xpc_identify_act_IRQ_req(int nasid)
+{
+ struct xpc_rsvd_page *remote_rp;
+ struct xpc_vars *remote_vars;
+ u64 remote_rp_pa;
+ u64 remote_vars_pa;
+ int remote_rp_version;
+ int reactivate = 0;
+ int stamp_diff;
+ struct timespec remote_rp_stamp = { 0, 0 };
+ partid_t partid;
+ struct xpc_partition *part;
+ enum xpc_retval ret;
+
+
+ /* pull over the reserved page structure */
+
+ remote_rp = (struct xpc_rsvd_page *) xpc_remote_copy_buffer;
+
+ ret = xpc_get_remote_rp(nasid, NULL, remote_rp, &remote_rp_pa);
+ if (ret != xpcSuccess) {
+ dev_warn(xpc_part, "unable to get reserved page from nasid %d, "
+ "which sent interrupt, reason=%d\n", nasid, ret);
+ return;
+ }
+
+ remote_vars_pa = remote_rp->vars_pa;
+ remote_rp_version = remote_rp->version;
+ if (XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
+ remote_rp_stamp = remote_rp->stamp;
+ }
+ partid = remote_rp->partid;
+ part = &xpc_partitions[partid];
+
+
+ /* pull over the cross partition variables */
+
+ remote_vars = (struct xpc_vars *) xpc_remote_copy_buffer;
+
+ ret = xpc_get_remote_vars(remote_vars_pa, remote_vars);
+ if (ret != xpcSuccess) {
+
+ dev_warn(xpc_part, "unable to get XPC variables from nasid %d, "
+ "which sent interrupt, reason=%d\n", nasid, ret);
+
+ XPC_DEACTIVATE_PARTITION(part, ret);
+ return;
+ }
+
+
+ part->act_IRQ_rcvd++;
+
+ dev_dbg(xpc_part, "partid for nasid %d is %d; IRQs = %d; HB = "
+ "%ld:0x%lx\n", (int) nasid, (int) partid, part->act_IRQ_rcvd,
+ remote_vars->heartbeat, remote_vars->heartbeating_to_mask);
+
+ if (xpc_partition_disengaged(part) &&
+ part->act_state == XPC_P_INACTIVE) {
+
+ xpc_update_partition_info(part, remote_rp_version,
+ &remote_rp_stamp, remote_rp_pa,
+ remote_vars_pa, remote_vars);
+
+ if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
+ if (xpc_partition_disengage_requested(1UL << partid)) {
+ /*
+ * Other side is waiting on us to disengage,
+ * even though we already have.
+ */
+ return;
+ }
+ } else {
+ /* other side doesn't support disengage requests */
+ xpc_clear_partition_disengage_request(1UL << partid);
+ }
+
+ xpc_activate_partition(part);
+ return;
+ }
+
+ DBUG_ON(part->remote_rp_version == 0);
+ DBUG_ON(part->remote_vars_version == 0);
+
+ if (!XPC_SUPPORTS_RP_STAMP(part->remote_rp_version)) {
+ DBUG_ON(XPC_SUPPORTS_DISENGAGE_REQUEST(part->
+ remote_vars_version));
+
+ if (!XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
+ DBUG_ON(XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->
+ version));
+ /* see if the other side rebooted */
+ if (part->remote_amos_page_pa ==
+ remote_vars->amos_page_pa &&
+ xpc_hb_allowed(sn_partition_id,
+ remote_vars)) {
+ /* doesn't look that way, so ignore the IPI */
+ return;
+ }
+ }
+
+ /*
+ * Other side rebooted and previous XPC didn't support the
+ * disengage request, so we don't need to do anything special.
+ */
+
+ xpc_update_partition_info(part, remote_rp_version,
+ &remote_rp_stamp, remote_rp_pa,
+ remote_vars_pa, remote_vars);
+ part->reactivate_nasid = nasid;
+ XPC_DEACTIVATE_PARTITION(part, xpcReactivating);
+ return;
+ }
+
+ DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version));
+
+ if (!XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
+ DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->version));
+
+ /*
+ * Other side rebooted and previous XPC did support the
+ * disengage request, but the new one doesn't.
+ */
+
+ xpc_clear_partition_engaged(1UL << partid);
+ xpc_clear_partition_disengage_request(1UL << partid);
+
+ xpc_update_partition_info(part, remote_rp_version,
+ &remote_rp_stamp, remote_rp_pa,
+ remote_vars_pa, remote_vars);
+ reactivate = 1;
+
+ } else {
+ DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->version));
+
+ stamp_diff = xpc_compare_stamps(&part->remote_rp_stamp,
+ &remote_rp_stamp);
+ if (stamp_diff != 0) {
+ DBUG_ON(stamp_diff >= 0);
+
+ /*
+ * Other side rebooted and the previous XPC did support
+ * the disengage request, as does the new one.
+ */
+
+ DBUG_ON(xpc_partition_engaged(1UL << partid));
+ DBUG_ON(xpc_partition_disengage_requested(1UL <<
+ partid));
+
+ xpc_update_partition_info(part, remote_rp_version,
+ &remote_rp_stamp, remote_rp_pa,
+ remote_vars_pa, remote_vars);
+ reactivate = 1;
+ }
+ }
+
+ if (part->disengage_request_timeout > 0 &&
+ !xpc_partition_disengaged(part)) {
+ /* still waiting on other side to disengage from us */
+ return;
+ }
+
+ if (reactivate) {
+ part->reactivate_nasid = nasid;
+ XPC_DEACTIVATE_PARTITION(part, xpcReactivating);
+
+ } else if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version) &&
+ xpc_partition_disengage_requested(1UL << partid)) {
+ XPC_DEACTIVATE_PARTITION(part, xpcOtherGoingDown);
+ }
+}
+
+
+/*
+ * Loop through the activation AMO variables and process any bits
+ * which are set. Each bit indicates a nasid sending a partition
+ * activation or deactivation request.
+ *
+ * Return #of IRQs detected.
+ */
+int
+xpc_identify_act_IRQ_sender(void)
+{
+ int word, bit;
+ u64 nasid_mask;
+ u64 nasid; /* remote nasid */
+ int n_IRQs_detected = 0;
+ AMO_t *act_amos;
+
+
+ act_amos = xpc_vars->amos_page + XPC_ACTIVATE_IRQ_AMOS;
+
+
+ /* scan through act AMO variable looking for non-zero entries */
+ for (word = 0; word < xp_nasid_mask_words; word++) {
+
+ if (xpc_exiting) {
+ break;
+ }
+
+ nasid_mask = xpc_IPI_receive(&act_amos[word]);
+ if (nasid_mask == 0) {
+ /* no IRQs from nasids in this variable */
+ continue;
+ }
+
+ dev_dbg(xpc_part, "AMO[%d] gave back 0x%lx\n", word,
+ nasid_mask);
+
+
+ /*
+ * If this nasid has been added to the machine since
+ * our partition was reset, this will retain the
+ * remote nasid in our reserved pages machine mask.
+ * This is used in the event of module reload.
+ */
+ xpc_mach_nasids[word] |= nasid_mask;
+
+
+ /* locate the nasid(s) which sent interrupts */
+
+ for (bit = 0; bit < (8 * sizeof(u64)); bit++) {
+ if (nasid_mask & (1UL << bit)) {
+ n_IRQs_detected++;
+ nasid = XPC_NASID_FROM_W_B(word, bit);
+ dev_dbg(xpc_part, "interrupt from nasid %ld\n",
+ nasid);
+ xpc_identify_act_IRQ_req(nasid);
+ }
+ }
+ }
+ return n_IRQs_detected;
+}
+
+
+/*
+ * See if the other side has responded to a partition disengage request
+ * from us.
+ */
+int
+xpc_partition_disengaged(struct xpc_partition *part)
+{
+ partid_t partid = XPC_PARTID(part);
+ int disengaged;
+
+
+ disengaged = (xpc_partition_engaged(1UL << partid) == 0);
+ if (part->disengage_request_timeout) {
+ if (!disengaged) {
+ if (time_before(jiffies, part->disengage_request_timeout)) {
+ /* timelimit hasn't been reached yet */
+ return 0;
+ }
+
+ /*
+ * Other side hasn't responded to our disengage
+ * request in a timely fashion, so assume it's dead.
+ */
+
+ dev_info(xpc_part, "disengage from remote partition %d "
+ "timed out\n", partid);
+ xpc_disengage_request_timedout = 1;
+ xpc_clear_partition_engaged(1UL << partid);
+ disengaged = 1;
+ }
+ part->disengage_request_timeout = 0;
+
+ /* cancel the timer function, provided it's not us */
+ if (!in_interrupt()) {
+ del_singleshot_timer_sync(&part->
+ disengage_request_timer);
+ }
+
+ DBUG_ON(part->act_state != XPC_P_DEACTIVATING &&
+ part->act_state != XPC_P_INACTIVE);
+ if (part->act_state != XPC_P_INACTIVE) {
+ xpc_wakeup_channel_mgr(part);
+ }
+
+ if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
+ xpc_cancel_partition_disengage_request(part);
+ }
+ }
+ return disengaged;
+}
+
+
+/*
+ * Mark specified partition as active.
+ */
+enum xpc_retval
+xpc_mark_partition_active(struct xpc_partition *part)
+{
+ unsigned long irq_flags;
+ enum xpc_retval ret;
+
+
+ dev_dbg(xpc_part, "setting partition %d to ACTIVE\n", XPC_PARTID(part));
+
+ spin_lock_irqsave(&part->act_lock, irq_flags);
+ if (part->act_state == XPC_P_ACTIVATING) {
+ part->act_state = XPC_P_ACTIVE;
+ ret = xpcSuccess;
+ } else {
+ DBUG_ON(part->reason == xpcSuccess);
+ ret = part->reason;
+ }
+ spin_unlock_irqrestore(&part->act_lock, irq_flags);
+
+ return ret;
+}
+
+
+/*
+ * Notify XPC that the partition is down.
+ */
+void
+xpc_deactivate_partition(const int line, struct xpc_partition *part,
+ enum xpc_retval reason)
+{
+ unsigned long irq_flags;
+
+
+ spin_lock_irqsave(&part->act_lock, irq_flags);
+
+ if (part->act_state == XPC_P_INACTIVE) {
+ XPC_SET_REASON(part, reason, line);
+ spin_unlock_irqrestore(&part->act_lock, irq_flags);
+ if (reason == xpcReactivating) {
+ /* we interrupt ourselves to reactivate partition */
+ xpc_IPI_send_reactivate(part);
+ }
+ return;
+ }
+ if (part->act_state == XPC_P_DEACTIVATING) {
+ if ((part->reason == xpcUnloading && reason != xpcUnloading) ||
+ reason == xpcReactivating) {
+ XPC_SET_REASON(part, reason, line);
+ }
+ spin_unlock_irqrestore(&part->act_lock, irq_flags);
+ return;
+ }
+
+ part->act_state = XPC_P_DEACTIVATING;
+ XPC_SET_REASON(part, reason, line);
+
+ spin_unlock_irqrestore(&part->act_lock, irq_flags);
+
+ if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
+ xpc_request_partition_disengage(part);
+ xpc_IPI_send_disengage(part);
+
+ /* set a timelimit on the disengage request */
+ part->disengage_request_timeout = jiffies +
+ (xpc_disengage_request_timelimit * HZ);
+ part->disengage_request_timer.expires =
+ part->disengage_request_timeout;
+ add_timer(&part->disengage_request_timer);
+ }
+
+ dev_dbg(xpc_part, "bringing partition %d down, reason = %d\n",
+ XPC_PARTID(part), reason);
+
+ xpc_partition_going_down(part, reason);
+}
+
+
+/*
+ * Mark specified partition as inactive.
+ */
+void
+xpc_mark_partition_inactive(struct xpc_partition *part)
+{
+ unsigned long irq_flags;
+
+
+ dev_dbg(xpc_part, "setting partition %d to INACTIVE\n",
+ XPC_PARTID(part));
+
+ spin_lock_irqsave(&part->act_lock, irq_flags);
+ part->act_state = XPC_P_INACTIVE;
+ spin_unlock_irqrestore(&part->act_lock, irq_flags);
+ part->remote_rp_pa = 0;
+}
+
+
+/*
+ * SAL has provided a partition and machine mask. The partition mask
+ * contains a bit for each even nasid in our partition. The machine
+ * mask contains a bit for each even nasid in the entire machine.
+ *
+ * Using those two bit arrays, we can determine which nasids are
+ * known in the machine. Each should also have a reserved page
+ * initialized if they are available for partitioning.
+ */
+void
+xpc_discovery(void)
+{
+ void *remote_rp_base;
+ struct xpc_rsvd_page *remote_rp;
+ struct xpc_vars *remote_vars;
+ u64 remote_rp_pa;
+ u64 remote_vars_pa;
+ int region;
+ int region_size;
+ int max_regions;
+ int nasid;
+ struct xpc_rsvd_page *rp;
+ partid_t partid;
+ struct xpc_partition *part;
+ u64 *discovered_nasids;
+ enum xpc_retval ret;
+
+
+ remote_rp = xpc_kmalloc_cacheline_aligned(XPC_RP_HEADER_SIZE +
+ xp_nasid_mask_bytes,
+ GFP_KERNEL, &remote_rp_base);
+ if (remote_rp == NULL) {
+ return;
+ }
+ remote_vars = (struct xpc_vars *) remote_rp;
+
+
+ discovered_nasids = kzalloc(sizeof(u64) * xp_nasid_mask_words,
+ GFP_KERNEL);
+ if (discovered_nasids == NULL) {
+ kfree(remote_rp_base);
+ return;
+ }
+
+ rp = (struct xpc_rsvd_page *) xpc_rsvd_page;
+
+ /*
+ * The term 'region' in this context refers to the minimum number of
+ * nodes that can comprise an access protection grouping. The access
+ * protection is in regards to memory, IOI and IPI.
+ */
+ max_regions = 64;
+ region_size = sn_region_size;
+
+ switch (region_size) {
+ case 128:
+ max_regions *= 2;
+ case 64:
+ max_regions *= 2;
+ case 32:
+ max_regions *= 2;
+ region_size = 16;
+ DBUG_ON(!is_shub2());
+ }
+
+ for (region = 0; region < max_regions; region++) {
+
+ if ((volatile int) xpc_exiting) {
+ break;
+ }
+
+ dev_dbg(xpc_part, "searching region %d\n", region);
+
+ for (nasid = (region * region_size * 2);
+ nasid < ((region + 1) * region_size * 2);
+ nasid += 2) {
+
+ if ((volatile int) xpc_exiting) {
+ break;
+ }
+
+ dev_dbg(xpc_part, "checking nasid %d\n", nasid);
+
+
+ if (XPC_NASID_IN_ARRAY(nasid, xpc_part_nasids)) {
+ dev_dbg(xpc_part, "PROM indicates Nasid %d is "
+ "part of the local partition; skipping "
+ "region\n", nasid);
+ break;
+ }
+
+ if (!(XPC_NASID_IN_ARRAY(nasid, xpc_mach_nasids))) {
+ dev_dbg(xpc_part, "PROM indicates Nasid %d was "
+ "not on Numa-Link network at reset\n",
+ nasid);
+ continue;
+ }
+
+ if (XPC_NASID_IN_ARRAY(nasid, discovered_nasids)) {
+ dev_dbg(xpc_part, "Nasid %d is part of a "
+ "partition which was previously "
+ "discovered\n", nasid);
+ continue;
+ }
+
+
+ /* pull over the reserved page structure */
+
+ ret = xpc_get_remote_rp(nasid, discovered_nasids,
+ remote_rp, &remote_rp_pa);
+ if (ret != xpcSuccess) {
+ dev_dbg(xpc_part, "unable to get reserved page "
+ "from nasid %d, reason=%d\n", nasid,
+ ret);
+
+ if (ret == xpcLocalPartid) {
+ break;
+ }
+ continue;
+ }
+
+ remote_vars_pa = remote_rp->vars_pa;
+
+ partid = remote_rp->partid;
+ part = &xpc_partitions[partid];
+
+
+ /* pull over the cross partition variables */
+
+ ret = xpc_get_remote_vars(remote_vars_pa, remote_vars);
+ if (ret != xpcSuccess) {
+ dev_dbg(xpc_part, "unable to get XPC variables "
+ "from nasid %d, reason=%d\n", nasid,
+ ret);
+
+ XPC_DEACTIVATE_PARTITION(part, ret);
+ continue;
+ }
+
+ if (part->act_state != XPC_P_INACTIVE) {
+ dev_dbg(xpc_part, "partition %d on nasid %d is "
+ "already activating\n", partid, nasid);
+ break;
+ }
+
+ /*
+ * Register the remote partition's AMOs with SAL so it
+ * can handle and cleanup errors within that address
+ * range should the remote partition go down. We don't
+ * unregister this range because it is difficult to
+ * tell when outstanding writes to the remote partition
+ * are finished and thus when it is thus safe to
+ * unregister. This should not result in wasted space
+ * in the SAL xp_addr_region table because we should
+ * get the same page for remote_act_amos_pa after
+ * module reloads and system reboots.
+ */
+ if (sn_register_xp_addr_region(
+ remote_vars->amos_page_pa,
+ PAGE_SIZE, 1) < 0) {
+ dev_dbg(xpc_part, "partition %d failed to "
+ "register xp_addr region 0x%016lx\n",
+ partid, remote_vars->amos_page_pa);
+
+ XPC_SET_REASON(part, xpcPhysAddrRegFailed,
+ __LINE__);
+ break;
+ }
+
+ /*
+ * The remote nasid is valid and available.
+ * Send an interrupt to that nasid to notify
+ * it that we are ready to begin activation.
+ */
+ dev_dbg(xpc_part, "sending an interrupt to AMO 0x%lx, "
+ "nasid %d, phys_cpuid 0x%x\n",
+ remote_vars->amos_page_pa,
+ remote_vars->act_nasid,
+ remote_vars->act_phys_cpuid);
+
+ if (XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->
+ version)) {
+ part->remote_amos_page_pa =
+ remote_vars->amos_page_pa;
+ xpc_mark_partition_disengaged(part);
+ xpc_cancel_partition_disengage_request(part);
+ }
+ xpc_IPI_send_activate(remote_vars);
+ }
+ }
+
+ kfree(discovered_nasids);
+ kfree(remote_rp_base);
+}
+
+
+/*
+ * Given a partid, get the nasids owned by that partition from the
+ * remote partition's reserved page.
+ */
+enum xpc_retval
+xpc_initiate_partid_to_nasids(partid_t partid, void *nasid_mask)
+{
+ struct xpc_partition *part;
+ u64 part_nasid_pa;
+ int bte_res;
+
+
+ part = &xpc_partitions[partid];
+ if (part->remote_rp_pa == 0) {
+ return xpcPartitionDown;
+ }
+
+ memset(nasid_mask, 0, XP_NASID_MASK_BYTES);
+
+ part_nasid_pa = (u64) XPC_RP_PART_NASIDS(part->remote_rp_pa);
+
+ bte_res = xp_bte_copy(part_nasid_pa, (u64) nasid_mask,
+ xp_nasid_mask_bytes, (BTE_NOTIFY | BTE_WACQUIRE), NULL);
+
+ return xpc_map_bte_errors(bte_res);
+}
+
--- /dev/null
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1999-2008 Silicon Graphics, Inc. All rights reserved.
+ */
+
+
+/*
+ * Cross Partition Network Interface (XPNET) support
+ *
+ * XPNET provides a virtual network layered on top of the Cross
+ * Partition communication layer.
+ *
+ * XPNET provides direct point-to-point and broadcast-like support
+ * for an ethernet-like device. The ethernet broadcast medium is
+ * replaced with a point-to-point message structure which passes
+ * pointers to a DMA-capable block that a remote partition should
+ * retrieve and pass to the upper level networking layer.
+ *
+ */
+
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/delay.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+#include <linux/smp.h>
+#include <linux/string.h>
+#include <asm/sn/bte.h>
+#include <asm/sn/io.h>
+#include <asm/sn/sn_sal.h>
+#include <asm/types.h>
+#include <asm/atomic.h>
+#include "xp.h"
+
+
+/*
+ * The message payload transferred by XPC.
+ *
+ * buf_pa is the physical address where the DMA should pull from.
+ *
+ * NOTE: for performance reasons, buf_pa should _ALWAYS_ begin on a
+ * cacheline boundary. To accomplish this, we record the number of
+ * bytes from the beginning of the first cacheline to the first useful
+ * byte of the skb (leadin_ignore) and the number of bytes from the
+ * last useful byte of the skb to the end of the last cacheline
+ * (tailout_ignore).
+ *
+ * size is the number of bytes to transfer which includes the skb->len
+ * (useful bytes of the senders skb) plus the leadin and tailout
+ */
+struct xpnet_message {
+ u16 version; /* Version for this message */
+ u16 embedded_bytes; /* #of bytes embedded in XPC message */
+ u32 magic; /* Special number indicating this is xpnet */
+ u64 buf_pa; /* phys address of buffer to retrieve */
+ u32 size; /* #of bytes in buffer */
+ u8 leadin_ignore; /* #of bytes to ignore at the beginning */
+ u8 tailout_ignore; /* #of bytes to ignore at the end */
+ unsigned char data; /* body of small packets */
+};
+
+/*
+ * Determine the size of our message, the cacheline aligned size,
+ * and then the number of message will request from XPC.
+ *
+ * XPC expects each message to exist in an individual cacheline.
+ */
+#define XPNET_MSG_SIZE (L1_CACHE_BYTES - XPC_MSG_PAYLOAD_OFFSET)
+#define XPNET_MSG_DATA_MAX \
+ (XPNET_MSG_SIZE - (u64)(&((struct xpnet_message *)0)->data))
+#define XPNET_MSG_ALIGNED_SIZE (L1_CACHE_ALIGN(XPNET_MSG_SIZE))
+#define XPNET_MSG_NENTRIES (PAGE_SIZE / XPNET_MSG_ALIGNED_SIZE)
+
+
+#define XPNET_MAX_KTHREADS (XPNET_MSG_NENTRIES + 1)
+#define XPNET_MAX_IDLE_KTHREADS (XPNET_MSG_NENTRIES + 1)
+
+/*
+ * Version number of XPNET implementation. XPNET can always talk to versions
+ * with same major #, and never talk to versions with a different version.
+ */
+#define _XPNET_VERSION(_major, _minor) (((_major) << 4) | (_minor))
+#define XPNET_VERSION_MAJOR(_v) ((_v) >> 4)
+#define XPNET_VERSION_MINOR(_v) ((_v) & 0xf)
+
+#define XPNET_VERSION _XPNET_VERSION(1,0) /* version 1.0 */
+#define XPNET_VERSION_EMBED _XPNET_VERSION(1,1) /* version 1.1 */
+#define XPNET_MAGIC 0x88786984 /* "XNET" */
+
+#define XPNET_VALID_MSG(_m) \
+ ((XPNET_VERSION_MAJOR(_m->version) == XPNET_VERSION_MAJOR(XPNET_VERSION)) \
+ && (msg->magic == XPNET_MAGIC))
+
+#define XPNET_DEVICE_NAME "xp0"
+
+
+/*
+ * When messages are queued with xpc_send_notify, a kmalloc'd buffer
+ * of the following type is passed as a notification cookie. When the
+ * notification function is called, we use the cookie to decide
+ * whether all outstanding message sends have completed. The skb can
+ * then be released.
+ */
+struct xpnet_pending_msg {
+ struct list_head free_list;
+ struct sk_buff *skb;
+ atomic_t use_count;
+};
+
+/* driver specific structure pointed to by the device structure */
+struct xpnet_dev_private {
+ struct net_device_stats stats;
+};
+
+struct net_device *xpnet_device;
+
+/*
+ * When we are notified of other partitions activating, we add them to
+ * our bitmask of partitions to which we broadcast.
+ */
+static u64 xpnet_broadcast_partitions;
+/* protect above */
+static DEFINE_SPINLOCK(xpnet_broadcast_lock);
+
+/*
+ * Since the Block Transfer Engine (BTE) is being used for the transfer
+ * and it relies upon cache-line size transfers, we need to reserve at
+ * least one cache-line for head and tail alignment. The BTE is
+ * limited to 8MB transfers.
+ *
+ * Testing has shown that changing MTU to greater than 64KB has no effect
+ * on TCP as the two sides negotiate a Max Segment Size that is limited
+ * to 64K. Other protocols May use packets greater than this, but for
+ * now, the default is 64KB.
+ */
+#define XPNET_MAX_MTU (0x800000UL - L1_CACHE_BYTES)
+/* 32KB has been determined to be the ideal */
+#define XPNET_DEF_MTU (0x8000UL)
+
+
+/*
+ * The partition id is encapsulated in the MAC address. The following
+ * define locates the octet the partid is in.
+ */
+#define XPNET_PARTID_OCTET 1
+#define XPNET_LICENSE_OCTET 2
+
+
+/*
+ * Define the XPNET debug device structure that is to be used with dev_dbg(),
+ * dev_err(), dev_warn(), and dev_info().
+ */
+struct device_driver xpnet_dbg_name = {
+ .name = "xpnet"
+};
+
+struct device xpnet_dbg_subname = {
+ .bus_id = {0}, /* set to "" */
+ .driver = &xpnet_dbg_name
+};
+
+struct device *xpnet = &xpnet_dbg_subname;
+
+/*
+ * Packet was recevied by XPC and forwarded to us.
+ */
+static void
+xpnet_receive(partid_t partid, int channel, struct xpnet_message *msg)
+{
+ struct sk_buff *skb;
+ bte_result_t bret;
+ struct xpnet_dev_private *priv =
+ (struct xpnet_dev_private *) xpnet_device->priv;
+
+
+ if (!XPNET_VALID_MSG(msg)) {
+ /*
+ * Packet with a different XPC version. Ignore.
+ */
+ xpc_received(partid, channel, (void *) msg);
+
+ priv->stats.rx_errors++;
+
+ return;
+ }
+ dev_dbg(xpnet, "received 0x%lx, %d, %d, %d\n", msg->buf_pa, msg->size,
+ msg->leadin_ignore, msg->tailout_ignore);
+
+
+ /* reserve an extra cache line */
+ skb = dev_alloc_skb(msg->size + L1_CACHE_BYTES);
+ if (!skb) {
+ dev_err(xpnet, "failed on dev_alloc_skb(%d)\n",
+ msg->size + L1_CACHE_BYTES);
+
+ xpc_received(partid, channel, (void *) msg);
+
+ priv->stats.rx_errors++;
+
+ return;
+ }
+
+ /*
+ * The allocated skb has some reserved space.
+ * In order to use bte_copy, we need to get the
+ * skb->data pointer moved forward.
+ */
+ skb_reserve(skb, (L1_CACHE_BYTES - ((u64)skb->data &
+ (L1_CACHE_BYTES - 1)) +
+ msg->leadin_ignore));
+
+ /*
+ * Update the tail pointer to indicate data actually
+ * transferred.
+ */
+ skb_put(skb, (msg->size - msg->leadin_ignore - msg->tailout_ignore));
+
+ /*
+ * Move the data over from the other side.
+ */
+ if ((XPNET_VERSION_MINOR(msg->version) == 1) &&
+ (msg->embedded_bytes != 0)) {
+ dev_dbg(xpnet, "copying embedded message. memcpy(0x%p, 0x%p, "
+ "%lu)\n", skb->data, &msg->data,
+ (size_t) msg->embedded_bytes);
+
+ skb_copy_to_linear_data(skb, &msg->data, (size_t)msg->embedded_bytes);
+ } else {
+ dev_dbg(xpnet, "transferring buffer to the skb->data area;\n\t"
+ "bte_copy(0x%p, 0x%p, %hu)\n", (void *)msg->buf_pa,
+ (void *)__pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
+ msg->size);
+
+ bret = bte_copy(msg->buf_pa,
+ __pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
+ msg->size, (BTE_NOTIFY | BTE_WACQUIRE), NULL);
+
+ if (bret != BTE_SUCCESS) {
+ // >>> Need better way of cleaning skb. Currently skb
+ // >>> appears in_use and we can't just call
+ // >>> dev_kfree_skb.
+ dev_err(xpnet, "bte_copy(0x%p, 0x%p, 0x%hx) returned "
+ "error=0x%x\n", (void *)msg->buf_pa,
+ (void *)__pa((u64)skb->data &
+ ~(L1_CACHE_BYTES - 1)),
+ msg->size, bret);
+
+ xpc_received(partid, channel, (void *) msg);
+
+ priv->stats.rx_errors++;
+
+ return;
+ }
+ }
+
+ dev_dbg(xpnet, "<skb->head=0x%p skb->data=0x%p skb->tail=0x%p "
+ "skb->end=0x%p skb->len=%d\n", (void *) skb->head,
+ (void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb),
+ skb->len);
+
+ skb->protocol = eth_type_trans(skb, xpnet_device);
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ dev_dbg(xpnet, "passing skb to network layer\n"
+ KERN_DEBUG "\tskb->head=0x%p skb->data=0x%p skb->tail=0x%p "
+ "skb->end=0x%p skb->len=%d\n",
+ (void *)skb->head, (void *)skb->data, skb_tail_pointer(skb),
+ skb_end_pointer(skb), skb->len);
+
+
+ xpnet_device->last_rx = jiffies;
+ priv->stats.rx_packets++;
+ priv->stats.rx_bytes += skb->len + ETH_HLEN;
+
+ netif_rx_ni(skb);
+ xpc_received(partid, channel, (void *) msg);
+}
+
+
+/*
+ * This is the handler which XPC calls during any sort of change in
+ * state or message reception on a connection.
+ */
+static void
+xpnet_connection_activity(enum xpc_retval reason, partid_t partid, int channel,
+ void *data, void *key)
+{
+ long bp;
+
+
+ DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+ DBUG_ON(channel != XPC_NET_CHANNEL);
+
+ switch(reason) {
+ case xpcMsgReceived: /* message received */
+ DBUG_ON(data == NULL);
+
+ xpnet_receive(partid, channel, (struct xpnet_message *) data);
+ break;
+
+ case xpcConnected: /* connection completed to a partition */
+ spin_lock_bh(&xpnet_broadcast_lock);
+ xpnet_broadcast_partitions |= 1UL << (partid -1 );
+ bp = xpnet_broadcast_partitions;
+ spin_unlock_bh(&xpnet_broadcast_lock);
+
+ netif_carrier_on(xpnet_device);
+
+ dev_dbg(xpnet, "%s connection created to partition %d; "
+ "xpnet_broadcast_partitions=0x%lx\n",
+ xpnet_device->name, partid, bp);
+ break;
+
+ default:
+ spin_lock_bh(&xpnet_broadcast_lock);
+ xpnet_broadcast_partitions &= ~(1UL << (partid -1 ));
+ bp = xpnet_broadcast_partitions;
+ spin_unlock_bh(&xpnet_broadcast_lock);
+
+ if (bp == 0) {
+ netif_carrier_off(xpnet_device);
+ }
+
+ dev_dbg(xpnet, "%s disconnected from partition %d; "
+ "xpnet_broadcast_partitions=0x%lx\n",
+ xpnet_device->name, partid, bp);
+ break;
+
+ }
+}
+
+
+static int
+xpnet_dev_open(struct net_device *dev)
+{
+ enum xpc_retval ret;
+
+
+ dev_dbg(xpnet, "calling xpc_connect(%d, 0x%p, NULL, %ld, %ld, %ld, "
+ "%ld)\n", XPC_NET_CHANNEL, xpnet_connection_activity,
+ XPNET_MSG_SIZE, XPNET_MSG_NENTRIES, XPNET_MAX_KTHREADS,
+ XPNET_MAX_IDLE_KTHREADS);
+
+ ret = xpc_connect(XPC_NET_CHANNEL, xpnet_connection_activity, NULL,
+ XPNET_MSG_SIZE, XPNET_MSG_NENTRIES,
+ XPNET_MAX_KTHREADS, XPNET_MAX_IDLE_KTHREADS);
+ if (ret != xpcSuccess) {
+ dev_err(xpnet, "ifconfig up of %s failed on XPC connect, "
+ "ret=%d\n", dev->name, ret);
+
+ return -ENOMEM;
+ }
+
+ dev_dbg(xpnet, "ifconfig up of %s; XPC connected\n", dev->name);
+
+ return 0;
+}
+
+
+static int
+xpnet_dev_stop(struct net_device *dev)
+{
+ xpc_disconnect(XPC_NET_CHANNEL);
+
+ dev_dbg(xpnet, "ifconfig down of %s; XPC disconnected\n", dev->name);
+
+ return 0;
+}
+
+
+static int
+xpnet_dev_change_mtu(struct net_device *dev, int new_mtu)
+{
+ /* 68 comes from min TCP+IP+MAC header */
+ if ((new_mtu < 68) || (new_mtu > XPNET_MAX_MTU)) {
+ dev_err(xpnet, "ifconfig %s mtu %d failed; value must be "
+ "between 68 and %ld\n", dev->name, new_mtu,
+ XPNET_MAX_MTU);
+ return -EINVAL;
+ }
+
+ dev->mtu = new_mtu;
+ dev_dbg(xpnet, "ifconfig %s mtu set to %d\n", dev->name, new_mtu);
+ return 0;
+}
+
+
+/*
+ * Required for the net_device structure.
+ */
+static int
+xpnet_dev_set_config(struct net_device *dev, struct ifmap *new_map)
+{
+ return 0;
+}
+
+
+/*
+ * Return statistics to the caller.
+ */
+static struct net_device_stats *
+xpnet_dev_get_stats(struct net_device *dev)
+{
+ struct xpnet_dev_private *priv;
+
+
+ priv = (struct xpnet_dev_private *) dev->priv;
+
+ return &priv->stats;
+}
+
+
+/*
+ * Notification that the other end has received the message and
+ * DMA'd the skb information. At this point, they are done with
+ * our side. When all recipients are done processing, we
+ * release the skb and then release our pending message structure.
+ */
+static void
+xpnet_send_completed(enum xpc_retval reason, partid_t partid, int channel,
+ void *__qm)
+{
+ struct xpnet_pending_msg *queued_msg =
+ (struct xpnet_pending_msg *) __qm;
+
+
+ DBUG_ON(queued_msg == NULL);
+
+ dev_dbg(xpnet, "message to %d notified with reason %d\n",
+ partid, reason);
+
+ if (atomic_dec_return(&queued_msg->use_count) == 0) {
+ dev_dbg(xpnet, "all acks for skb->head=-x%p\n",
+ (void *) queued_msg->skb->head);
+
+ dev_kfree_skb_any(queued_msg->skb);
+ kfree(queued_msg);
+ }
+}
+
+
+/*
+ * Network layer has formatted a packet (skb) and is ready to place it
+ * "on the wire". Prepare and send an xpnet_message to all partitions
+ * which have connected with us and are targets of this packet.
+ *
+ * MAC-NOTE: For the XPNET driver, the MAC address contains the
+ * destination partition_id. If the destination partition id word
+ * is 0xff, this packet is to broadcast to all partitions.
+ */
+static int
+xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct xpnet_pending_msg *queued_msg;
+ enum xpc_retval ret;
+ struct xpnet_message *msg;
+ u64 start_addr, end_addr;
+ long dp;
+ u8 second_mac_octet;
+ partid_t dest_partid;
+ struct xpnet_dev_private *priv;
+ u16 embedded_bytes;
+
+
+ priv = (struct xpnet_dev_private *) dev->priv;
+
+
+ dev_dbg(xpnet, ">skb->head=0x%p skb->data=0x%p skb->tail=0x%p "
+ "skb->end=0x%p skb->len=%d\n", (void *) skb->head,
+ (void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb),
+ skb->len);
+
+
+ /*
+ * The xpnet_pending_msg tracks how many outstanding
+ * xpc_send_notifies are relying on this skb. When none
+ * remain, release the skb.
+ */
+ queued_msg = kmalloc(sizeof(struct xpnet_pending_msg), GFP_ATOMIC);
+ if (queued_msg == NULL) {
+ dev_warn(xpnet, "failed to kmalloc %ld bytes; dropping "
+ "packet\n", sizeof(struct xpnet_pending_msg));
+
+ priv->stats.tx_errors++;
+
+ return -ENOMEM;
+ }
+
+
+ /* get the beginning of the first cacheline and end of last */
+ start_addr = ((u64) skb->data & ~(L1_CACHE_BYTES - 1));
+ end_addr = L1_CACHE_ALIGN((u64)skb_tail_pointer(skb));
+
+ /* calculate how many bytes to embed in the XPC message */
+ embedded_bytes = 0;
+ if (unlikely(skb->len <= XPNET_MSG_DATA_MAX)) {
+ /* skb->data does fit so embed */
+ embedded_bytes = skb->len;
+ }
+
+
+ /*
+ * Since the send occurs asynchronously, we set the count to one
+ * and begin sending. Any sends that happen to complete before
+ * we are done sending will not free the skb. We will be left
+ * with that task during exit. This also handles the case of
+ * a packet destined for a partition which is no longer up.
+ */
+ atomic_set(&queued_msg->use_count, 1);
+ queued_msg->skb = skb;
+
+
+ second_mac_octet = skb->data[XPNET_PARTID_OCTET];
+ if (second_mac_octet == 0xff) {
+ /* we are being asked to broadcast to all partitions */
+ dp = xpnet_broadcast_partitions;
+ } else if (second_mac_octet != 0) {
+ dp = xpnet_broadcast_partitions &
+ (1UL << (second_mac_octet - 1));
+ } else {
+ /* 0 is an invalid partid. Ignore */
+ dp = 0;
+ }
+ dev_dbg(xpnet, "destination Partitions mask (dp) = 0x%lx\n", dp);
+
+ /*
+ * If we wanted to allow promiscuous mode to work like an
+ * unswitched network, this would be a good point to OR in a
+ * mask of partitions which should be receiving all packets.
+ */
+
+ /*
+ * Main send loop.
+ */
+ for (dest_partid = 1; dp && dest_partid < XP_MAX_PARTITIONS;
+ dest_partid++) {
+
+
+ if (!(dp & (1UL << (dest_partid - 1)))) {
+ /* not destined for this partition */
+ continue;
+ }
+
+ /* remove this partition from the destinations mask */
+ dp &= ~(1UL << (dest_partid - 1));
+
+
+ /* found a partition to send to */
+
+ ret = xpc_allocate(dest_partid, XPC_NET_CHANNEL,
+ XPC_NOWAIT, (void **)&msg);
+ if (unlikely(ret != xpcSuccess)) {
+ continue;
+ }
+
+ msg->embedded_bytes = embedded_bytes;
+ if (unlikely(embedded_bytes != 0)) {
+ msg->version = XPNET_VERSION_EMBED;
+ dev_dbg(xpnet, "calling memcpy(0x%p, 0x%p, 0x%lx)\n",
+ &msg->data, skb->data, (size_t) embedded_bytes);
+ skb_copy_from_linear_data(skb, &msg->data,
+ (size_t)embedded_bytes);
+ } else {
+ msg->version = XPNET_VERSION;
+ }
+ msg->magic = XPNET_MAGIC;
+ msg->size = end_addr - start_addr;
+ msg->leadin_ignore = (u64) skb->data - start_addr;
+ msg->tailout_ignore = end_addr - (u64)skb_tail_pointer(skb);
+ msg->buf_pa = __pa(start_addr);
+
+ dev_dbg(xpnet, "sending XPC message to %d:%d\n"
+ KERN_DEBUG "msg->buf_pa=0x%lx, msg->size=%u, "
+ "msg->leadin_ignore=%u, msg->tailout_ignore=%u\n",
+ dest_partid, XPC_NET_CHANNEL, msg->buf_pa, msg->size,
+ msg->leadin_ignore, msg->tailout_ignore);
+
+
+ atomic_inc(&queued_msg->use_count);
+
+ ret = xpc_send_notify(dest_partid, XPC_NET_CHANNEL, msg,
+ xpnet_send_completed, queued_msg);
+ if (unlikely(ret != xpcSuccess)) {
+ atomic_dec(&queued_msg->use_count);
+ continue;
+ }
+
+ }
+
+ if (atomic_dec_return(&queued_msg->use_count) == 0) {
+ dev_dbg(xpnet, "no partitions to receive packet destined for "
+ "%d\n", dest_partid);
+
+
+ dev_kfree_skb(skb);
+ kfree(queued_msg);
+ }
+
+ priv->stats.tx_packets++;
+ priv->stats.tx_bytes += skb->len;
+
+ return 0;
+}
+
+
+/*
+ * Deal with transmit timeouts coming from the network layer.
+ */
+static void
+xpnet_dev_tx_timeout (struct net_device *dev)
+{
+ struct xpnet_dev_private *priv;
+
+
+ priv = (struct xpnet_dev_private *) dev->priv;
+
+ priv->stats.tx_errors++;
+ return;
+}
+
+
+static int __init
+xpnet_init(void)
+{
+ int i;
+ u32 license_num;
+ int result = -ENOMEM;
+
+
+ if (!ia64_platform_is("sn2")) {
+ return -ENODEV;
+ }
+
+ dev_info(xpnet, "registering network device %s\n", XPNET_DEVICE_NAME);
+
+ /*
+ * use ether_setup() to init the majority of our device
+ * structure and then override the necessary pieces.
+ */
+ xpnet_device = alloc_netdev(sizeof(struct xpnet_dev_private),
+ XPNET_DEVICE_NAME, ether_setup);
+ if (xpnet_device == NULL) {
+ return -ENOMEM;
+ }
+
+ netif_carrier_off(xpnet_device);
+
+ xpnet_device->mtu = XPNET_DEF_MTU;
+ xpnet_device->change_mtu = xpnet_dev_change_mtu;
+ xpnet_device->open = xpnet_dev_open;
+ xpnet_device->get_stats = xpnet_dev_get_stats;
+ xpnet_device->stop = xpnet_dev_stop;
+ xpnet_device->hard_start_xmit = xpnet_dev_hard_start_xmit;
+ xpnet_device->tx_timeout = xpnet_dev_tx_timeout;
+ xpnet_device->set_config = xpnet_dev_set_config;
+
+ /*
+ * Multicast assumes the LSB of the first octet is set for multicast
+ * MAC addresses. We chose the first octet of the MAC to be unlikely
+ * to collide with any vendor's officially issued MAC.
+ */
+ xpnet_device->dev_addr[0] = 0xfe;
+ xpnet_device->dev_addr[XPNET_PARTID_OCTET] = sn_partition_id;
+ license_num = sn_partition_serial_number_val();
+ for (i = 3; i >= 0; i--) {
+ xpnet_device->dev_addr[XPNET_LICENSE_OCTET + i] =
+ license_num & 0xff;
+ license_num = license_num >> 8;
+ }
+
+ /*
+ * ether_setup() sets this to a multicast device. We are
+ * really not supporting multicast at this time.
+ */
+ xpnet_device->flags &= ~IFF_MULTICAST;
+
+ /*
+ * No need to checksum as it is a DMA transfer. The BTE will
+ * report an error if the data is not retrievable and the
+ * packet will be dropped.
+ */
+ xpnet_device->features = NETIF_F_NO_CSUM;
+
+ result = register_netdev(xpnet_device);
+ if (result != 0) {
+ free_netdev(xpnet_device);
+ }
+
+ return result;
+}
+module_init(xpnet_init);
+
+
+static void __exit
+xpnet_exit(void)
+{
+ dev_info(xpnet, "unregistering network device %s\n",
+ xpnet_device[0].name);
+
+ unregister_netdev(xpnet_device);
+
+ free_netdev(xpnet_device);
+}
+module_exit(xpnet_exit);
+
+
+MODULE_AUTHOR("Silicon Graphics, Inc.");
+MODULE_DESCRIPTION("Cross Partition Network adapter (XPNET)");
+MODULE_LICENSE("GPL");
+
+++ /dev/null
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2004-2005 Silicon Graphics, Inc. All rights reserved.
- */
-
-
-/*
- * External Cross Partition (XP) structures and defines.
- */
-
-
-#ifndef _ASM_IA64_SN_XP_H
-#define _ASM_IA64_SN_XP_H
-
-
-#include <linux/cache.h>
-#include <linux/hardirq.h>
-#include <linux/mutex.h>
-#include <asm/sn/types.h>
-#include <asm/sn/bte.h>
-
-
-#ifdef USE_DBUG_ON
-#define DBUG_ON(condition) BUG_ON(condition)
-#else
-#define DBUG_ON(condition)
-#endif
-
-
-/*
- * Define the maximum number of logically defined partitions the system
- * can support. It is constrained by the maximum number of hardware
- * partitionable regions. The term 'region' in this context refers to the
- * minimum number of nodes that can comprise an access protection grouping.
- * The access protection is in regards to memory, IPI and IOI.
- *
- * The maximum number of hardware partitionable regions is equal to the
- * maximum number of nodes in the entire system divided by the minimum number
- * of nodes that comprise an access protection grouping.
- */
-#define XP_MAX_PARTITIONS 64
-
-
-/*
- * Define the number of u64s required to represent all the C-brick nasids
- * as a bitmap. The cross-partition kernel modules deal only with
- * C-brick nasids, thus the need for bitmaps which don't account for
- * odd-numbered (non C-brick) nasids.
- */
-#define XP_MAX_PHYSNODE_ID (MAX_NUMALINK_NODES / 2)
-#define XP_NASID_MASK_BYTES ((XP_MAX_PHYSNODE_ID + 7) / 8)
-#define XP_NASID_MASK_WORDS ((XP_MAX_PHYSNODE_ID + 63) / 64)
-
-
-/*
- * Wrapper for bte_copy() that should it return a failure status will retry
- * the bte_copy() once in the hope that the failure was due to a temporary
- * aberration (i.e., the link going down temporarily).
- *
- * src - physical address of the source of the transfer.
- * vdst - virtual address of the destination of the transfer.
- * len - number of bytes to transfer from source to destination.
- * mode - see bte_copy() for definition.
- * notification - see bte_copy() for definition.
- *
- * Note: xp_bte_copy() should never be called while holding a spinlock.
- */
-static inline bte_result_t
-xp_bte_copy(u64 src, u64 vdst, u64 len, u64 mode, void *notification)
-{
- bte_result_t ret;
- u64 pdst = ia64_tpa(vdst);
-
-
- /*
- * Ensure that the physically mapped memory is contiguous.
- *
- * We do this by ensuring that the memory is from region 7 only.
- * If the need should arise to use memory from one of the other
- * regions, then modify the BUG_ON() statement to ensure that the
- * memory from that region is always physically contiguous.
- */
- BUG_ON(REGION_NUMBER(vdst) != RGN_KERNEL);
-
- ret = bte_copy(src, pdst, len, mode, notification);
- if ((ret != BTE_SUCCESS) && BTE_ERROR_RETRY(ret)) {
- if (!in_interrupt()) {
- cond_resched();
- }
- ret = bte_copy(src, pdst, len, mode, notification);
- }
-
- return ret;
-}
-
-
-/*
- * XPC establishes channel connections between the local partition and any
- * other partition that is currently up. Over these channels, kernel-level
- * `users' can communicate with their counterparts on the other partitions.
- *
- * The maxinum number of channels is limited to eight. For performance reasons,
- * the internal cross partition structures require sixteen bytes per channel,
- * and eight allows all of this interface-shared info to fit in one cache line.
- *
- * XPC_NCHANNELS reflects the total number of channels currently defined.
- * If the need for additional channels arises, one can simply increase
- * XPC_NCHANNELS accordingly. If the day should come where that number
- * exceeds the MAXIMUM number of channels allowed (eight), then one will need
- * to make changes to the XPC code to allow for this.
- */
-#define XPC_MEM_CHANNEL 0 /* memory channel number */
-#define XPC_NET_CHANNEL 1 /* network channel number */
-
-#define XPC_NCHANNELS 2 /* #of defined channels */
-#define XPC_MAX_NCHANNELS 8 /* max #of channels allowed */
-
-#if XPC_NCHANNELS > XPC_MAX_NCHANNELS
-#error XPC_NCHANNELS exceeds MAXIMUM allowed.
-#endif
-
-
-/*
- * The format of an XPC message is as follows:
- *
- * +-------+--------------------------------+
- * | flags |////////////////////////////////|
- * +-------+--------------------------------+
- * | message # |
- * +----------------------------------------+
- * | payload (user-defined message) |
- * | |
- * :
- * | |
- * +----------------------------------------+
- *
- * The size of the payload is defined by the user via xpc_connect(). A user-
- * defined message resides in the payload area.
- *
- * The user should have no dealings with the message header, but only the
- * message's payload. When a message entry is allocated (via xpc_allocate())
- * a pointer to the payload area is returned and not the actual beginning of
- * the XPC message. The user then constructs a message in the payload area
- * and passes that pointer as an argument on xpc_send() or xpc_send_notify().
- *
- * The size of a message entry (within a message queue) must be a cacheline
- * sized multiple in order to facilitate the BTE transfer of messages from one
- * message queue to another. A macro, XPC_MSG_SIZE(), is provided for the user
- * that wants to fit as many msg entries as possible in a given memory size
- * (e.g. a memory page).
- */
-struct xpc_msg {
- u8 flags; /* FOR XPC INTERNAL USE ONLY */
- u8 reserved[7]; /* FOR XPC INTERNAL USE ONLY */
- s64 number; /* FOR XPC INTERNAL USE ONLY */
-
- u64 payload; /* user defined portion of message */
-};
-
-
-#define XPC_MSG_PAYLOAD_OFFSET (u64) (&((struct xpc_msg *)0)->payload)
-#define XPC_MSG_SIZE(_payload_size) \
- L1_CACHE_ALIGN(XPC_MSG_PAYLOAD_OFFSET + (_payload_size))
-
-
-/*
- * Define the return values and values passed to user's callout functions.
- * (It is important to add new value codes at the end just preceding
- * xpcUnknownReason, which must have the highest numerical value.)
- */
-enum xpc_retval {
- xpcSuccess = 0,
-
- xpcNotConnected, /* 1: channel is not connected */
- xpcConnected, /* 2: channel connected (opened) */
- xpcRETIRED1, /* 3: (formerly xpcDisconnected) */
-
- xpcMsgReceived, /* 4: message received */
- xpcMsgDelivered, /* 5: message delivered and acknowledged */
-
- xpcRETIRED2, /* 6: (formerly xpcTransferFailed) */
-
- xpcNoWait, /* 7: operation would require wait */
- xpcRetry, /* 8: retry operation */
- xpcTimeout, /* 9: timeout in xpc_allocate_msg_wait() */
- xpcInterrupted, /* 10: interrupted wait */
-
- xpcUnequalMsgSizes, /* 11: message size disparity between sides */
- xpcInvalidAddress, /* 12: invalid address */
-
- xpcNoMemory, /* 13: no memory available for XPC structures */
- xpcLackOfResources, /* 14: insufficient resources for operation */
- xpcUnregistered, /* 15: channel is not registered */
- xpcAlreadyRegistered, /* 16: channel is already registered */
-
- xpcPartitionDown, /* 17: remote partition is down */
- xpcNotLoaded, /* 18: XPC module is not loaded */
- xpcUnloading, /* 19: this side is unloading XPC module */
-
- xpcBadMagic, /* 20: XPC MAGIC string not found */
-
- xpcReactivating, /* 21: remote partition was reactivated */
-
- xpcUnregistering, /* 22: this side is unregistering channel */
- xpcOtherUnregistering, /* 23: other side is unregistering channel */
-
- xpcCloneKThread, /* 24: cloning kernel thread */
- xpcCloneKThreadFailed, /* 25: cloning kernel thread failed */
-
- xpcNoHeartbeat, /* 26: remote partition has no heartbeat */
-
- xpcPioReadError, /* 27: PIO read error */
- xpcPhysAddrRegFailed, /* 28: registration of phys addr range failed */
-
- xpcBteDirectoryError, /* 29: maps to BTEFAIL_DIR */
- xpcBtePoisonError, /* 30: maps to BTEFAIL_POISON */
- xpcBteWriteError, /* 31: maps to BTEFAIL_WERR */
- xpcBteAccessError, /* 32: maps to BTEFAIL_ACCESS */
- xpcBtePWriteError, /* 33: maps to BTEFAIL_PWERR */
- xpcBtePReadError, /* 34: maps to BTEFAIL_PRERR */
- xpcBteTimeOutError, /* 35: maps to BTEFAIL_TOUT */
- xpcBteXtalkError, /* 36: maps to BTEFAIL_XTERR */
- xpcBteNotAvailable, /* 37: maps to BTEFAIL_NOTAVAIL */
- xpcBteUnmappedError, /* 38: unmapped BTEFAIL_ error */
-
- xpcBadVersion, /* 39: bad version number */
- xpcVarsNotSet, /* 40: the XPC variables are not set up */
- xpcNoRsvdPageAddr, /* 41: unable to get rsvd page's phys addr */
- xpcInvalidPartid, /* 42: invalid partition ID */
- xpcLocalPartid, /* 43: local partition ID */
-
- xpcOtherGoingDown, /* 44: other side going down, reason unknown */
- xpcSystemGoingDown, /* 45: system is going down, reason unknown */
- xpcSystemHalt, /* 46: system is being halted */
- xpcSystemReboot, /* 47: system is being rebooted */
- xpcSystemPoweroff, /* 48: system is being powered off */
-
- xpcDisconnecting, /* 49: channel disconnecting (closing) */
-
- xpcOpenCloseError, /* 50: channel open/close protocol error */
-
- xpcDisconnected, /* 51: channel disconnected (closed) */
-
- xpcBteSh2Start, /* 52: BTE CRB timeout */
-
- /* 53: 0x1 BTE Error Response Short */
- xpcBteSh2RspShort = xpcBteSh2Start + BTEFAIL_SH2_RESP_SHORT,
-
- /* 54: 0x2 BTE Error Response Long */
- xpcBteSh2RspLong = xpcBteSh2Start + BTEFAIL_SH2_RESP_LONG,
-
- /* 56: 0x4 BTE Error Response DSB */
- xpcBteSh2RspDSB = xpcBteSh2Start + BTEFAIL_SH2_RESP_DSP,
-
- /* 60: 0x8 BTE Error Response Access */
- xpcBteSh2RspAccess = xpcBteSh2Start + BTEFAIL_SH2_RESP_ACCESS,
-
- /* 68: 0x10 BTE Error CRB timeout */
- xpcBteSh2CRBTO = xpcBteSh2Start + BTEFAIL_SH2_CRB_TO,
-
- /* 84: 0x20 BTE Error NACK limit */
- xpcBteSh2NACKLimit = xpcBteSh2Start + BTEFAIL_SH2_NACK_LIMIT,
-
- /* 115: BTE end */
- xpcBteSh2End = xpcBteSh2Start + BTEFAIL_SH2_ALL,
-
- xpcUnknownReason /* 116: unknown reason -- must be last in list */
-};
-
-
-/*
- * Define the callout function types used by XPC to update the user on
- * connection activity and state changes (via the user function registered by
- * xpc_connect()) and to notify them of messages received and delivered (via
- * the user function registered by xpc_send_notify()).
- *
- * The two function types are xpc_channel_func and xpc_notify_func and
- * both share the following arguments, with the exception of "data", which
- * only xpc_channel_func has.
- *
- * Arguments:
- *
- * reason - reason code. (See following table.)
- * partid - partition ID associated with condition.
- * ch_number - channel # associated with condition.
- * data - pointer to optional data. (See following table.)
- * key - pointer to optional user-defined value provided as the "key"
- * argument to xpc_connect() or xpc_send_notify().
- *
- * In the following table the "Optional Data" column applies to callouts made
- * to functions registered by xpc_connect(). A "NA" in that column indicates
- * that this reason code can be passed to functions registered by
- * xpc_send_notify() (i.e. they don't have data arguments).
- *
- * Also, the first three reason codes in the following table indicate
- * success, whereas the others indicate failure. When a failure reason code
- * is received, one can assume that the channel is not connected.
- *
- *
- * Reason Code | Cause | Optional Data
- * =====================+================================+=====================
- * xpcConnected | connection has been established| max #of entries
- * | to the specified partition on | allowed in message
- * | the specified channel | queue
- * ---------------------+--------------------------------+---------------------
- * xpcMsgReceived | an XPC message arrived from | address of payload
- * | the specified partition on the |
- * | specified channel | [the user must call
- * | | xpc_received() when
- * | | finished with the
- * | | payload]
- * ---------------------+--------------------------------+---------------------
- * xpcMsgDelivered | notification that the message | NA
- * | was delivered to the intended |
- * | recipient and that they have |
- * | acknowledged its receipt by |
- * | calling xpc_received() |
- * =====================+================================+=====================
- * xpcUnequalMsgSizes | can't connect to the specified | NULL
- * | partition on the specified |
- * | channel because of mismatched |
- * | message sizes |
- * ---------------------+--------------------------------+---------------------
- * xpcNoMemory | insufficient memory avaiable | NULL
- * | to allocate message queue |
- * ---------------------+--------------------------------+---------------------
- * xpcLackOfResources | lack of resources to create | NULL
- * | the necessary kthreads to |
- * | support the channel |
- * ---------------------+--------------------------------+---------------------
- * xpcUnregistering | this side's user has | NULL or NA
- * | unregistered by calling |
- * | xpc_disconnect() |
- * ---------------------+--------------------------------+---------------------
- * xpcOtherUnregistering| the other side's user has | NULL or NA
- * | unregistered by calling |
- * | xpc_disconnect() |
- * ---------------------+--------------------------------+---------------------
- * xpcNoHeartbeat | the other side's XPC is no | NULL or NA
- * | longer heartbeating |
- * | |
- * ---------------------+--------------------------------+---------------------
- * xpcUnloading | this side's XPC module is | NULL or NA
- * | being unloaded |
- * | |
- * ---------------------+--------------------------------+---------------------
- * xpcOtherUnloading | the other side's XPC module is | NULL or NA
- * | is being unloaded |
- * | |
- * ---------------------+--------------------------------+---------------------
- * xpcPioReadError | xp_nofault_PIOR() returned an | NULL or NA
- * | error while sending an IPI |
- * | |
- * ---------------------+--------------------------------+---------------------
- * xpcInvalidAddress | the address either received or | NULL or NA
- * | sent by the specified partition|
- * | is invalid |
- * ---------------------+--------------------------------+---------------------
- * xpcBteNotAvailable | attempt to pull data from the | NULL or NA
- * xpcBtePoisonError | specified partition over the |
- * xpcBteWriteError | specified channel via a |
- * xpcBteAccessError | bte_copy() failed |
- * xpcBteTimeOutError | |
- * xpcBteXtalkError | |
- * xpcBteDirectoryError | |
- * xpcBteGenericError | |
- * xpcBteUnmappedError | |
- * ---------------------+--------------------------------+---------------------
- * xpcUnknownReason | the specified channel to the | NULL or NA
- * | specified partition was |
- * | unavailable for unknown reasons|
- * =====================+================================+=====================
- */
-
-typedef void (*xpc_channel_func)(enum xpc_retval reason, partid_t partid,
- int ch_number, void *data, void *key);
-
-typedef void (*xpc_notify_func)(enum xpc_retval reason, partid_t partid,
- int ch_number, void *key);
-
-
-/*
- * The following is a registration entry. There is a global array of these,
- * one per channel. It is used to record the connection registration made
- * by the users of XPC. As long as a registration entry exists, for any
- * partition that comes up, XPC will attempt to establish a connection on
- * that channel. Notification that a connection has been made will occur via
- * the xpc_channel_func function.
- *
- * The 'func' field points to the function to call when aynchronous
- * notification is required for such events as: a connection established/lost,
- * or an incoming message received, or an error condition encountered. A
- * non-NULL 'func' field indicates that there is an active registration for
- * the channel.
- */
-struct xpc_registration {
- struct mutex mutex;
- xpc_channel_func func; /* function to call */
- void *key; /* pointer to user's key */
- u16 nentries; /* #of msg entries in local msg queue */
- u16 msg_size; /* message queue's message size */
- u32 assigned_limit; /* limit on #of assigned kthreads */
- u32 idle_limit; /* limit on #of idle kthreads */
-} ____cacheline_aligned;
-
-
-#define XPC_CHANNEL_REGISTERED(_c) (xpc_registrations[_c].func != NULL)
-
-
-/* the following are valid xpc_allocate() flags */
-#define XPC_WAIT 0 /* wait flag */
-#define XPC_NOWAIT 1 /* no wait flag */
-
-
-struct xpc_interface {
- void (*connect)(int);
- void (*disconnect)(int);
- enum xpc_retval (*allocate)(partid_t, int, u32, void **);
- enum xpc_retval (*send)(partid_t, int, void *);
- enum xpc_retval (*send_notify)(partid_t, int, void *,
- xpc_notify_func, void *);
- void (*received)(partid_t, int, void *);
- enum xpc_retval (*partid_to_nasids)(partid_t, void *);
-};
-
-
-extern struct xpc_interface xpc_interface;
-
-extern void xpc_set_interface(void (*)(int),
- void (*)(int),
- enum xpc_retval (*)(partid_t, int, u32, void **),
- enum xpc_retval (*)(partid_t, int, void *),
- enum xpc_retval (*)(partid_t, int, void *, xpc_notify_func,
- void *),
- void (*)(partid_t, int, void *),
- enum xpc_retval (*)(partid_t, void *));
-extern void xpc_clear_interface(void);
-
-
-extern enum xpc_retval xpc_connect(int, xpc_channel_func, void *, u16,
- u16, u32, u32);
-extern void xpc_disconnect(int);
-
-static inline enum xpc_retval
-xpc_allocate(partid_t partid, int ch_number, u32 flags, void **payload)
-{
- return xpc_interface.allocate(partid, ch_number, flags, payload);
-}
-
-static inline enum xpc_retval
-xpc_send(partid_t partid, int ch_number, void *payload)
-{
- return xpc_interface.send(partid, ch_number, payload);
-}
-
-static inline enum xpc_retval
-xpc_send_notify(partid_t partid, int ch_number, void *payload,
- xpc_notify_func func, void *key)
-{
- return xpc_interface.send_notify(partid, ch_number, payload, func, key);
-}
-
-static inline void
-xpc_received(partid_t partid, int ch_number, void *payload)
-{
- return xpc_interface.received(partid, ch_number, payload);
-}
-
-static inline enum xpc_retval
-xpc_partid_to_nasids(partid_t partid, void *nasids)
-{
- return xpc_interface.partid_to_nasids(partid, nasids);
-}
-
-
-extern u64 xp_nofault_PIOR_target;
-extern int xp_nofault_PIOR(void *);
-extern int xp_error_PIOR(void);
-
-
-#endif /* _ASM_IA64_SN_XP_H */
-
+++ /dev/null
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (c) 2004-2007 Silicon Graphics, Inc. All Rights Reserved.
- */
-
-
-/*
- * Cross Partition Communication (XPC) structures and macros.
- */
-
-#ifndef _ASM_IA64_SN_XPC_H
-#define _ASM_IA64_SN_XPC_H
-
-
-#include <linux/interrupt.h>
-#include <linux/sysctl.h>
-#include <linux/device.h>
-#include <linux/mutex.h>
-#include <linux/completion.h>
-#include <asm/pgtable.h>
-#include <asm/processor.h>
-#include <asm/sn/bte.h>
-#include <asm/sn/clksupport.h>
-#include <asm/sn/addrs.h>
-#include <asm/sn/mspec.h>
-#include <asm/sn/shub_mmr.h>
-#include <asm/sn/xp.h>
-
-
-/*
- * XPC Version numbers consist of a major and minor number. XPC can always
- * talk to versions with same major #, and never talk to versions with a
- * different major #.
- */
-#define _XPC_VERSION(_maj, _min) (((_maj) << 4) | ((_min) & 0xf))
-#define XPC_VERSION_MAJOR(_v) ((_v) >> 4)
-#define XPC_VERSION_MINOR(_v) ((_v) & 0xf)
-
-
-/*
- * The next macros define word or bit representations for given
- * C-brick nasid in either the SAL provided bit array representing
- * nasids in the partition/machine or the AMO_t array used for
- * inter-partition initiation communications.
- *
- * For SN2 machines, C-Bricks are alway even numbered NASIDs. As
- * such, some space will be saved by insisting that nasid information
- * passed from SAL always be packed for C-Bricks and the
- * cross-partition interrupts use the same packing scheme.
- */
-#define XPC_NASID_W_INDEX(_n) (((_n) / 64) / 2)
-#define XPC_NASID_B_INDEX(_n) (((_n) / 2) & (64 - 1))
-#define XPC_NASID_IN_ARRAY(_n, _p) ((_p)[XPC_NASID_W_INDEX(_n)] & \
- (1UL << XPC_NASID_B_INDEX(_n)))
-#define XPC_NASID_FROM_W_B(_w, _b) (((_w) * 64 + (_b)) * 2)
-
-#define XPC_HB_DEFAULT_INTERVAL 5 /* incr HB every x secs */
-#define XPC_HB_CHECK_DEFAULT_INTERVAL 20 /* check HB every x secs */
-
-/* define the process name of HB checker and the CPU it is pinned to */
-#define XPC_HB_CHECK_THREAD_NAME "xpc_hb"
-#define XPC_HB_CHECK_CPU 0
-
-/* define the process name of the discovery thread */
-#define XPC_DISCOVERY_THREAD_NAME "xpc_discovery"
-
-
-/*
- * the reserved page
- *
- * SAL reserves one page of memory per partition for XPC. Though a full page
- * in length (16384 bytes), its starting address is not page aligned, but it
- * is cacheline aligned. The reserved page consists of the following:
- *
- * reserved page header
- *
- * The first cacheline of the reserved page contains the header
- * (struct xpc_rsvd_page). Before SAL initialization has completed,
- * SAL has set up the following fields of the reserved page header:
- * SAL_signature, SAL_version, partid, and nasids_size. The other
- * fields are set up by XPC. (xpc_rsvd_page points to the local
- * partition's reserved page.)
- *
- * part_nasids mask
- * mach_nasids mask
- *
- * SAL also sets up two bitmaps (or masks), one that reflects the actual
- * nasids in this partition (part_nasids), and the other that reflects
- * the actual nasids in the entire machine (mach_nasids). We're only
- * interested in the even numbered nasids (which contain the processors
- * and/or memory), so we only need half as many bits to represent the
- * nasids. The part_nasids mask is located starting at the first cacheline
- * following the reserved page header. The mach_nasids mask follows right
- * after the part_nasids mask. The size in bytes of each mask is reflected
- * by the reserved page header field 'nasids_size'. (Local partition's
- * mask pointers are xpc_part_nasids and xpc_mach_nasids.)
- *
- * vars
- * vars part
- *
- * Immediately following the mach_nasids mask are the XPC variables
- * required by other partitions. First are those that are generic to all
- * partitions (vars), followed on the next available cacheline by those
- * which are partition specific (vars part). These are setup by XPC.
- * (Local partition's vars pointers are xpc_vars and xpc_vars_part.)
- *
- * Note: Until vars_pa is set, the partition XPC code has not been initialized.
- */
-struct xpc_rsvd_page {
- u64 SAL_signature; /* SAL: unique signature */
- u64 SAL_version; /* SAL: version */
- u8 partid; /* SAL: partition ID */
- u8 version;
- u8 pad1[6]; /* align to next u64 in cacheline */
- volatile u64 vars_pa;
- struct timespec stamp; /* time when reserved page was setup by XPC */
- u64 pad2[9]; /* align to last u64 in cacheline */
- u64 nasids_size; /* SAL: size of each nasid mask in bytes */
-};
-
-#define XPC_RP_VERSION _XPC_VERSION(1,1) /* version 1.1 of the reserved page */
-
-#define XPC_SUPPORTS_RP_STAMP(_version) \
- (_version >= _XPC_VERSION(1,1))
-
-/*
- * compare stamps - the return value is:
- *
- * < 0, if stamp1 < stamp2
- * = 0, if stamp1 == stamp2
- * > 0, if stamp1 > stamp2
- */
-static inline int
-xpc_compare_stamps(struct timespec *stamp1, struct timespec *stamp2)
-{
- int ret;
-
-
- if ((ret = stamp1->tv_sec - stamp2->tv_sec) == 0) {
- ret = stamp1->tv_nsec - stamp2->tv_nsec;
- }
- return ret;
-}
-
-
-/*
- * Define the structures by which XPC variables can be exported to other
- * partitions. (There are two: struct xpc_vars and struct xpc_vars_part)
- */
-
-/*
- * The following structure describes the partition generic variables
- * needed by other partitions in order to properly initialize.
- *
- * struct xpc_vars version number also applies to struct xpc_vars_part.
- * Changes to either structure and/or related functionality should be
- * reflected by incrementing either the major or minor version numbers
- * of struct xpc_vars.
- */
-struct xpc_vars {
- u8 version;
- u64 heartbeat;
- u64 heartbeating_to_mask;
- u64 heartbeat_offline; /* if 0, heartbeat should be changing */
- int act_nasid;
- int act_phys_cpuid;
- u64 vars_part_pa;
- u64 amos_page_pa; /* paddr of page of AMOs from MSPEC driver */
- AMO_t *amos_page; /* vaddr of page of AMOs from MSPEC driver */
-};
-
-#define XPC_V_VERSION _XPC_VERSION(3,1) /* version 3.1 of the cross vars */
-
-#define XPC_SUPPORTS_DISENGAGE_REQUEST(_version) \
- (_version >= _XPC_VERSION(3,1))
-
-
-static inline int
-xpc_hb_allowed(partid_t partid, struct xpc_vars *vars)
-{
- return ((vars->heartbeating_to_mask & (1UL << partid)) != 0);
-}
-
-static inline void
-xpc_allow_hb(partid_t partid, struct xpc_vars *vars)
-{
- u64 old_mask, new_mask;
-
- do {
- old_mask = vars->heartbeating_to_mask;
- new_mask = (old_mask | (1UL << partid));
- } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) !=
- old_mask);
-}
-
-static inline void
-xpc_disallow_hb(partid_t partid, struct xpc_vars *vars)
-{
- u64 old_mask, new_mask;
-
- do {
- old_mask = vars->heartbeating_to_mask;
- new_mask = (old_mask & ~(1UL << partid));
- } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) !=
- old_mask);
-}
-
-
-/*
- * The AMOs page consists of a number of AMO variables which are divided into
- * four groups, The first two groups are used to identify an IRQ's sender.
- * These two groups consist of 64 and 128 AMO variables respectively. The last
- * two groups, consisting of just one AMO variable each, are used to identify
- * the remote partitions that are currently engaged (from the viewpoint of
- * the XPC running on the remote partition).
- */
-#define XPC_NOTIFY_IRQ_AMOS 0
-#define XPC_ACTIVATE_IRQ_AMOS (XPC_NOTIFY_IRQ_AMOS + XP_MAX_PARTITIONS)
-#define XPC_ENGAGED_PARTITIONS_AMO (XPC_ACTIVATE_IRQ_AMOS + XP_NASID_MASK_WORDS)
-#define XPC_DISENGAGE_REQUEST_AMO (XPC_ENGAGED_PARTITIONS_AMO + 1)
-
-
-/*
- * The following structure describes the per partition specific variables.
- *
- * An array of these structures, one per partition, will be defined. As a
- * partition becomes active XPC will copy the array entry corresponding to
- * itself from that partition. It is desirable that the size of this
- * structure evenly divide into a cacheline, such that none of the entries
- * in this array crosses a cacheline boundary. As it is now, each entry
- * occupies half a cacheline.
- */
-struct xpc_vars_part {
- volatile u64 magic;
-
- u64 openclose_args_pa; /* physical address of open and close args */
- u64 GPs_pa; /* physical address of Get/Put values */
-
- u64 IPI_amo_pa; /* physical address of IPI AMO_t structure */
- int IPI_nasid; /* nasid of where to send IPIs */
- int IPI_phys_cpuid; /* physical CPU ID of where to send IPIs */
-
- u8 nchannels; /* #of defined channels supported */
-
- u8 reserved[23]; /* pad to a full 64 bytes */
-};
-
-/*
- * The vars_part MAGIC numbers play a part in the first contact protocol.
- *
- * MAGIC1 indicates that the per partition specific variables for a remote
- * partition have been initialized by this partition.
- *
- * MAGIC2 indicates that this partition has pulled the remote partititions
- * per partition variables that pertain to this partition.
- */
-#define XPC_VP_MAGIC1 0x0053524156435058L /* 'XPCVARS\0'L (little endian) */
-#define XPC_VP_MAGIC2 0x0073726176435058L /* 'XPCvars\0'L (little endian) */
-
-
-/* the reserved page sizes and offsets */
-
-#define XPC_RP_HEADER_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page))
-#define XPC_RP_VARS_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_vars))
-
-#define XPC_RP_PART_NASIDS(_rp) (u64 *) ((u8 *) _rp + XPC_RP_HEADER_SIZE)
-#define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + xp_nasid_mask_words)
-#define XPC_RP_VARS(_rp) ((struct xpc_vars *) XPC_RP_MACH_NASIDS(_rp) + xp_nasid_mask_words)
-#define XPC_RP_VARS_PART(_rp) (struct xpc_vars_part *) ((u8 *) XPC_RP_VARS(rp) + XPC_RP_VARS_SIZE)
-
-
-/*
- * Functions registered by add_timer() or called by kernel_thread() only
- * allow for a single 64-bit argument. The following macros can be used to
- * pack and unpack two (32-bit, 16-bit or 8-bit) arguments into or out from
- * the passed argument.
- */
-#define XPC_PACK_ARGS(_arg1, _arg2) \
- ((((u64) _arg1) & 0xffffffff) | \
- ((((u64) _arg2) & 0xffffffff) << 32))
-
-#define XPC_UNPACK_ARG1(_args) (((u64) _args) & 0xffffffff)
-#define XPC_UNPACK_ARG2(_args) ((((u64) _args) >> 32) & 0xffffffff)
-
-
-
-/*
- * Define a Get/Put value pair (pointers) used with a message queue.
- */
-struct xpc_gp {
- volatile s64 get; /* Get value */
- volatile s64 put; /* Put value */
-};
-
-#define XPC_GP_SIZE \
- L1_CACHE_ALIGN(sizeof(struct xpc_gp) * XPC_NCHANNELS)
-
-
-
-/*
- * Define a structure that contains arguments associated with opening and
- * closing a channel.
- */
-struct xpc_openclose_args {
- u16 reason; /* reason why channel is closing */
- u16 msg_size; /* sizeof each message entry */
- u16 remote_nentries; /* #of message entries in remote msg queue */
- u16 local_nentries; /* #of message entries in local msg queue */
- u64 local_msgqueue_pa; /* physical address of local message queue */
-};
-
-#define XPC_OPENCLOSE_ARGS_SIZE \
- L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * XPC_NCHANNELS)
-
-
-
-/* struct xpc_msg flags */
-
-#define XPC_M_DONE 0x01 /* msg has been received/consumed */
-#define XPC_M_READY 0x02 /* msg is ready to be sent */
-#define XPC_M_INTERRUPT 0x04 /* send interrupt when msg consumed */
-
-
-#define XPC_MSG_ADDRESS(_payload) \
- ((struct xpc_msg *)((u8 *)(_payload) - XPC_MSG_PAYLOAD_OFFSET))
-
-
-
-/*
- * Defines notify entry.
- *
- * This is used to notify a message's sender that their message was received
- * and consumed by the intended recipient.
- */
-struct xpc_notify {
- volatile u8 type; /* type of notification */
-
- /* the following two fields are only used if type == XPC_N_CALL */
- xpc_notify_func func; /* user's notify function */
- void *key; /* pointer to user's key */
-};
-
-/* struct xpc_notify type of notification */
-
-#define XPC_N_CALL 0x01 /* notify function provided by user */
-
-
-
-/*
- * Define the structure that manages all the stuff required by a channel. In
- * particular, they are used to manage the messages sent across the channel.
- *
- * This structure is private to a partition, and is NOT shared across the
- * partition boundary.
- *
- * There is an array of these structures for each remote partition. It is
- * allocated at the time a partition becomes active. The array contains one
- * of these structures for each potential channel connection to that partition.
- *
- * Each of these structures manages two message queues (circular buffers).
- * They are allocated at the time a channel connection is made. One of
- * these message queues (local_msgqueue) holds the locally created messages
- * that are destined for the remote partition. The other of these message
- * queues (remote_msgqueue) is a locally cached copy of the remote partition's
- * own local_msgqueue.
- *
- * The following is a description of the Get/Put pointers used to manage these
- * two message queues. Consider the local_msgqueue to be on one partition
- * and the remote_msgqueue to be its cached copy on another partition. A
- * description of what each of the lettered areas contains is included.
- *
- *
- * local_msgqueue remote_msgqueue
- *
- * |/////////| |/////////|
- * w_remote_GP.get --> +---------+ |/////////|
- * | F | |/////////|
- * remote_GP.get --> +---------+ +---------+ <-- local_GP->get
- * | | | |
- * | | | E |
- * | | | |
- * | | +---------+ <-- w_local_GP.get
- * | B | |/////////|
- * | | |////D////|
- * | | |/////////|
- * | | +---------+ <-- w_remote_GP.put
- * | | |////C////|
- * local_GP->put --> +---------+ +---------+ <-- remote_GP.put
- * | | |/////////|
- * | A | |/////////|
- * | | |/////////|
- * w_local_GP.put --> +---------+ |/////////|
- * |/////////| |/////////|
- *
- *
- * ( remote_GP.[get|put] are cached copies of the remote
- * partition's local_GP->[get|put], and thus their values can
- * lag behind their counterparts on the remote partition. )
- *
- *
- * A - Messages that have been allocated, but have not yet been sent to the
- * remote partition.
- *
- * B - Messages that have been sent, but have not yet been acknowledged by the
- * remote partition as having been received.
- *
- * C - Area that needs to be prepared for the copying of sent messages, by
- * the clearing of the message flags of any previously received messages.
- *
- * D - Area into which sent messages are to be copied from the remote
- * partition's local_msgqueue and then delivered to their intended
- * recipients. [ To allow for a multi-message copy, another pointer
- * (next_msg_to_pull) has been added to keep track of the next message
- * number needing to be copied (pulled). It chases after w_remote_GP.put.
- * Any messages lying between w_local_GP.get and next_msg_to_pull have
- * been copied and are ready to be delivered. ]
- *
- * E - Messages that have been copied and delivered, but have not yet been
- * acknowledged by the recipient as having been received.
- *
- * F - Messages that have been acknowledged, but XPC has not yet notified the
- * sender that the message was received by its intended recipient.
- * This is also an area that needs to be prepared for the allocating of
- * new messages, by the clearing of the message flags of the acknowledged
- * messages.
- */
-struct xpc_channel {
- partid_t partid; /* ID of remote partition connected */
- spinlock_t lock; /* lock for updating this structure */
- u32 flags; /* general flags */
-
- enum xpc_retval reason; /* reason why channel is disconnect'g */
- int reason_line; /* line# disconnect initiated from */
-
- u16 number; /* channel # */
-
- u16 msg_size; /* sizeof each msg entry */
- u16 local_nentries; /* #of msg entries in local msg queue */
- u16 remote_nentries; /* #of msg entries in remote msg queue*/
-
- void *local_msgqueue_base; /* base address of kmalloc'd space */
- struct xpc_msg *local_msgqueue; /* local message queue */
- void *remote_msgqueue_base; /* base address of kmalloc'd space */
- struct xpc_msg *remote_msgqueue;/* cached copy of remote partition's */
- /* local message queue */
- u64 remote_msgqueue_pa; /* phys addr of remote partition's */
- /* local message queue */
-
- atomic_t references; /* #of external references to queues */
-
- atomic_t n_on_msg_allocate_wq; /* #on msg allocation wait queue */
- wait_queue_head_t msg_allocate_wq; /* msg allocation wait queue */
-
- u8 delayed_IPI_flags; /* IPI flags received, but delayed */
- /* action until channel disconnected */
-
- /* queue of msg senders who want to be notified when msg received */
-
- atomic_t n_to_notify; /* #of msg senders to notify */
- struct xpc_notify *notify_queue;/* notify queue for messages sent */
-
- xpc_channel_func func; /* user's channel function */
- void *key; /* pointer to user's key */
-
- struct mutex msg_to_pull_mutex; /* next msg to pull serialization */
- struct completion wdisconnect_wait; /* wait for channel disconnect */
-
- struct xpc_openclose_args *local_openclose_args; /* args passed on */
- /* opening or closing of channel */
-
- /* various flavors of local and remote Get/Put values */
-
- struct xpc_gp *local_GP; /* local Get/Put values */
- struct xpc_gp remote_GP; /* remote Get/Put values */
- struct xpc_gp w_local_GP; /* working local Get/Put values */
- struct xpc_gp w_remote_GP; /* working remote Get/Put values */
- s64 next_msg_to_pull; /* Put value of next msg to pull */
-
- /* kthread management related fields */
-
-// >>> rethink having kthreads_assigned_limit and kthreads_idle_limit; perhaps
-// >>> allow the assigned limit be unbounded and let the idle limit be dynamic
-// >>> dependent on activity over the last interval of time
- atomic_t kthreads_assigned; /* #of kthreads assigned to channel */
- u32 kthreads_assigned_limit; /* limit on #of kthreads assigned */
- atomic_t kthreads_idle; /* #of kthreads idle waiting for work */
- u32 kthreads_idle_limit; /* limit on #of kthreads idle */
- atomic_t kthreads_active; /* #of kthreads actively working */
- // >>> following field is temporary
- u32 kthreads_created; /* total #of kthreads created */
-
- wait_queue_head_t idle_wq; /* idle kthread wait queue */
-
-} ____cacheline_aligned;
-
-
-/* struct xpc_channel flags */
-
-#define XPC_C_WASCONNECTED 0x00000001 /* channel was connected */
-
-#define XPC_C_ROPENREPLY 0x00000002 /* remote open channel reply */
-#define XPC_C_OPENREPLY 0x00000004 /* local open channel reply */
-#define XPC_C_ROPENREQUEST 0x00000008 /* remote open channel request */
-#define XPC_C_OPENREQUEST 0x00000010 /* local open channel request */
-
-#define XPC_C_SETUP 0x00000020 /* channel's msgqueues are alloc'd */
-#define XPC_C_CONNECTEDCALLOUT 0x00000040 /* connected callout initiated */
-#define XPC_C_CONNECTEDCALLOUT_MADE \
- 0x00000080 /* connected callout completed */
-#define XPC_C_CONNECTED 0x00000100 /* local channel is connected */
-#define XPC_C_CONNECTING 0x00000200 /* channel is being connected */
-
-#define XPC_C_RCLOSEREPLY 0x00000400 /* remote close channel reply */
-#define XPC_C_CLOSEREPLY 0x00000800 /* local close channel reply */
-#define XPC_C_RCLOSEREQUEST 0x00001000 /* remote close channel request */
-#define XPC_C_CLOSEREQUEST 0x00002000 /* local close channel request */
-
-#define XPC_C_DISCONNECTED 0x00004000 /* channel is disconnected */
-#define XPC_C_DISCONNECTING 0x00008000 /* channel is being disconnected */
-#define XPC_C_DISCONNECTINGCALLOUT \
- 0x00010000 /* disconnecting callout initiated */
-#define XPC_C_DISCONNECTINGCALLOUT_MADE \
- 0x00020000 /* disconnecting callout completed */
-#define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */
-
-
-
-/*
- * Manages channels on a partition basis. There is one of these structures
- * for each partition (a partition will never utilize the structure that
- * represents itself).
- */
-struct xpc_partition {
-
- /* XPC HB infrastructure */
-
- u8 remote_rp_version; /* version# of partition's rsvd pg */
- struct timespec remote_rp_stamp;/* time when rsvd pg was initialized */
- u64 remote_rp_pa; /* phys addr of partition's rsvd pg */
- u64 remote_vars_pa; /* phys addr of partition's vars */
- u64 remote_vars_part_pa; /* phys addr of partition's vars part */
- u64 last_heartbeat; /* HB at last read */
- u64 remote_amos_page_pa; /* phys addr of partition's amos page */
- int remote_act_nasid; /* active part's act/deact nasid */
- int remote_act_phys_cpuid; /* active part's act/deact phys cpuid */
- u32 act_IRQ_rcvd; /* IRQs since activation */
- spinlock_t act_lock; /* protect updating of act_state */
- u8 act_state; /* from XPC HB viewpoint */
- u8 remote_vars_version; /* version# of partition's vars */
- enum xpc_retval reason; /* reason partition is deactivating */
- int reason_line; /* line# deactivation initiated from */
- int reactivate_nasid; /* nasid in partition to reactivate */
-
- unsigned long disengage_request_timeout; /* timeout in jiffies */
- struct timer_list disengage_request_timer;
-
-
- /* XPC infrastructure referencing and teardown control */
-
- volatile u8 setup_state; /* infrastructure setup state */
- wait_queue_head_t teardown_wq; /* kthread waiting to teardown infra */
- atomic_t references; /* #of references to infrastructure */
-
-
- /*
- * NONE OF THE PRECEDING FIELDS OF THIS STRUCTURE WILL BE CLEARED WHEN
- * XPC SETS UP THE NECESSARY INFRASTRUCTURE TO SUPPORT CROSS PARTITION
- * COMMUNICATION. ALL OF THE FOLLOWING FIELDS WILL BE CLEARED. (THE
- * 'nchannels' FIELD MUST BE THE FIRST OF THE FIELDS TO BE CLEARED.)
- */
-
-
- u8 nchannels; /* #of defined channels supported */
- atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */
- atomic_t nchannels_engaged;/* #of channels engaged with remote part */
- struct xpc_channel *channels;/* array of channel structures */
-
- void *local_GPs_base; /* base address of kmalloc'd space */
- struct xpc_gp *local_GPs; /* local Get/Put values */
- void *remote_GPs_base; /* base address of kmalloc'd space */
- struct xpc_gp *remote_GPs;/* copy of remote partition's local Get/Put */
- /* values */
- u64 remote_GPs_pa; /* phys address of remote partition's local */
- /* Get/Put values */
-
-
- /* fields used to pass args when opening or closing a channel */
-
- void *local_openclose_args_base; /* base address of kmalloc'd space */
- struct xpc_openclose_args *local_openclose_args; /* local's args */
- void *remote_openclose_args_base; /* base address of kmalloc'd space */
- struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */
- /* args */
- u64 remote_openclose_args_pa; /* phys addr of remote's args */
-
-
- /* IPI sending, receiving and handling related fields */
-
- int remote_IPI_nasid; /* nasid of where to send IPIs */
- int remote_IPI_phys_cpuid; /* phys CPU ID of where to send IPIs */
- AMO_t *remote_IPI_amo_va; /* address of remote IPI AMO_t structure */
-
- AMO_t *local_IPI_amo_va; /* address of IPI AMO_t structure */
- u64 local_IPI_amo; /* IPI amo flags yet to be handled */
- char IPI_owner[8]; /* IPI owner's name */
- struct timer_list dropped_IPI_timer; /* dropped IPI timer */
-
- spinlock_t IPI_lock; /* IPI handler lock */
-
-
- /* channel manager related fields */
-
- atomic_t channel_mgr_requests; /* #of requests to activate chan mgr */
- wait_queue_head_t channel_mgr_wq; /* channel mgr's wait queue */
-
-} ____cacheline_aligned;
-
-
-/* struct xpc_partition act_state values (for XPC HB) */
-
-#define XPC_P_INACTIVE 0x00 /* partition is not active */
-#define XPC_P_ACTIVATION_REQ 0x01 /* created thread to activate */
-#define XPC_P_ACTIVATING 0x02 /* activation thread started */
-#define XPC_P_ACTIVE 0x03 /* xpc_partition_up() was called */
-#define XPC_P_DEACTIVATING 0x04 /* partition deactivation initiated */
-
-
-#define XPC_DEACTIVATE_PARTITION(_p, _reason) \
- xpc_deactivate_partition(__LINE__, (_p), (_reason))
-
-
-/* struct xpc_partition setup_state values */
-
-#define XPC_P_UNSET 0x00 /* infrastructure was never setup */
-#define XPC_P_SETUP 0x01 /* infrastructure is setup */
-#define XPC_P_WTEARDOWN 0x02 /* waiting to teardown infrastructure */
-#define XPC_P_TORNDOWN 0x03 /* infrastructure is torndown */
-
-
-
-/*
- * struct xpc_partition IPI_timer #of seconds to wait before checking for
- * dropped IPIs. These occur whenever an IPI amo write doesn't complete until
- * after the IPI was received.
- */
-#define XPC_P_DROPPED_IPI_WAIT (0.25 * HZ)
-
-
-/* number of seconds to wait for other partitions to disengage */
-#define XPC_DISENGAGE_REQUEST_DEFAULT_TIMELIMIT 90
-
-/* interval in seconds to print 'waiting disengagement' messages */
-#define XPC_DISENGAGE_PRINTMSG_INTERVAL 10
-
-
-#define XPC_PARTID(_p) ((partid_t) ((_p) - &xpc_partitions[0]))
-
-
-
-/* found in xp_main.c */
-extern struct xpc_registration xpc_registrations[];
-
-
-/* found in xpc_main.c */
-extern struct device *xpc_part;
-extern struct device *xpc_chan;
-extern int xpc_disengage_request_timelimit;
-extern int xpc_disengage_request_timedout;
-extern irqreturn_t xpc_notify_IRQ_handler(int, void *);
-extern void xpc_dropped_IPI_check(struct xpc_partition *);
-extern void xpc_activate_partition(struct xpc_partition *);
-extern void xpc_activate_kthreads(struct xpc_channel *, int);
-extern void xpc_create_kthreads(struct xpc_channel *, int, int);
-extern void xpc_disconnect_wait(int);
-
-
-/* found in xpc_partition.c */
-extern int xpc_exiting;
-extern struct xpc_vars *xpc_vars;
-extern struct xpc_rsvd_page *xpc_rsvd_page;
-extern struct xpc_vars_part *xpc_vars_part;
-extern struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1];
-extern char *xpc_remote_copy_buffer;
-extern void *xpc_remote_copy_buffer_base;
-extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **);
-extern struct xpc_rsvd_page *xpc_rsvd_page_init(void);
-extern void xpc_allow_IPI_ops(void);
-extern void xpc_restrict_IPI_ops(void);
-extern int xpc_identify_act_IRQ_sender(void);
-extern int xpc_partition_disengaged(struct xpc_partition *);
-extern enum xpc_retval xpc_mark_partition_active(struct xpc_partition *);
-extern void xpc_mark_partition_inactive(struct xpc_partition *);
-extern void xpc_discovery(void);
-extern void xpc_check_remote_hb(void);
-extern void xpc_deactivate_partition(const int, struct xpc_partition *,
- enum xpc_retval);
-extern enum xpc_retval xpc_initiate_partid_to_nasids(partid_t, void *);
-
-
-/* found in xpc_channel.c */
-extern void xpc_initiate_connect(int);
-extern void xpc_initiate_disconnect(int);
-extern enum xpc_retval xpc_initiate_allocate(partid_t, int, u32, void **);
-extern enum xpc_retval xpc_initiate_send(partid_t, int, void *);
-extern enum xpc_retval xpc_initiate_send_notify(partid_t, int, void *,
- xpc_notify_func, void *);
-extern void xpc_initiate_received(partid_t, int, void *);
-extern enum xpc_retval xpc_setup_infrastructure(struct xpc_partition *);
-extern enum xpc_retval xpc_pull_remote_vars_part(struct xpc_partition *);
-extern void xpc_process_channel_activity(struct xpc_partition *);
-extern void xpc_connected_callout(struct xpc_channel *);
-extern void xpc_deliver_msg(struct xpc_channel *);
-extern void xpc_disconnect_channel(const int, struct xpc_channel *,
- enum xpc_retval, unsigned long *);
-extern void xpc_disconnect_callout(struct xpc_channel *, enum xpc_retval);
-extern void xpc_partition_going_down(struct xpc_partition *, enum xpc_retval);
-extern void xpc_teardown_infrastructure(struct xpc_partition *);
-
-
-
-static inline void
-xpc_wakeup_channel_mgr(struct xpc_partition *part)
-{
- if (atomic_inc_return(&part->channel_mgr_requests) == 1) {
- wake_up(&part->channel_mgr_wq);
- }
-}
-
-
-
-/*
- * These next two inlines are used to keep us from tearing down a channel's
- * msg queues while a thread may be referencing them.
- */
-static inline void
-xpc_msgqueue_ref(struct xpc_channel *ch)
-{
- atomic_inc(&ch->references);
-}
-
-static inline void
-xpc_msgqueue_deref(struct xpc_channel *ch)
-{
- s32 refs = atomic_dec_return(&ch->references);
-
- DBUG_ON(refs < 0);
- if (refs == 0) {
- xpc_wakeup_channel_mgr(&xpc_partitions[ch->partid]);
- }
-}
-
-
-
-#define XPC_DISCONNECT_CHANNEL(_ch, _reason, _irqflgs) \
- xpc_disconnect_channel(__LINE__, _ch, _reason, _irqflgs)
-
-
-/*
- * These two inlines are used to keep us from tearing down a partition's
- * setup infrastructure while a thread may be referencing it.
- */
-static inline void
-xpc_part_deref(struct xpc_partition *part)
-{
- s32 refs = atomic_dec_return(&part->references);
-
-
- DBUG_ON(refs < 0);
- if (refs == 0 && part->setup_state == XPC_P_WTEARDOWN) {
- wake_up(&part->teardown_wq);
- }
-}
-
-static inline int
-xpc_part_ref(struct xpc_partition *part)
-{
- int setup;
-
-
- atomic_inc(&part->references);
- setup = (part->setup_state == XPC_P_SETUP);
- if (!setup) {
- xpc_part_deref(part);
- }
- return setup;
-}
-
-
-
-/*
- * The following macro is to be used for the setting of the reason and
- * reason_line fields in both the struct xpc_channel and struct xpc_partition
- * structures.
- */
-#define XPC_SET_REASON(_p, _reason, _line) \
- { \
- (_p)->reason = _reason; \
- (_p)->reason_line = _line; \
- }
-
-
-
-/*
- * This next set of inlines are used to keep track of when a partition is
- * potentially engaged in accessing memory belonging to another partition.
- */
-
-static inline void
-xpc_mark_partition_engaged(struct xpc_partition *part)
-{
- unsigned long irq_flags;
- AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa +
- (XPC_ENGAGED_PARTITIONS_AMO * sizeof(AMO_t)));
-
-
- local_irq_save(irq_flags);
-
- /* set bit corresponding to our partid in remote partition's AMO */
- FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_OR,
- (1UL << sn_partition_id));
- /*
- * We must always use the nofault function regardless of whether we
- * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
- * didn't, we'd never know that the other partition is down and would
- * keep sending IPIs and AMOs to it until the heartbeat times out.
- */
- (void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->
- variable), xp_nofault_PIOR_target));
-
- local_irq_restore(irq_flags);
-}
-
-static inline void
-xpc_mark_partition_disengaged(struct xpc_partition *part)
-{
- unsigned long irq_flags;
- AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa +
- (XPC_ENGAGED_PARTITIONS_AMO * sizeof(AMO_t)));
-
-
- local_irq_save(irq_flags);
-
- /* clear bit corresponding to our partid in remote partition's AMO */
- FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND,
- ~(1UL << sn_partition_id));
- /*
- * We must always use the nofault function regardless of whether we
- * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
- * didn't, we'd never know that the other partition is down and would
- * keep sending IPIs and AMOs to it until the heartbeat times out.
- */
- (void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->
- variable), xp_nofault_PIOR_target));
-
- local_irq_restore(irq_flags);
-}
-
-static inline void
-xpc_request_partition_disengage(struct xpc_partition *part)
-{
- unsigned long irq_flags;
- AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa +
- (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t)));
-
-
- local_irq_save(irq_flags);
-
- /* set bit corresponding to our partid in remote partition's AMO */
- FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_OR,
- (1UL << sn_partition_id));
- /*
- * We must always use the nofault function regardless of whether we
- * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
- * didn't, we'd never know that the other partition is down and would
- * keep sending IPIs and AMOs to it until the heartbeat times out.
- */
- (void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->
- variable), xp_nofault_PIOR_target));
-
- local_irq_restore(irq_flags);
-}
-
-static inline void
-xpc_cancel_partition_disengage_request(struct xpc_partition *part)
-{
- unsigned long irq_flags;
- AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa +
- (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t)));
-
-
- local_irq_save(irq_flags);
-
- /* clear bit corresponding to our partid in remote partition's AMO */
- FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND,
- ~(1UL << sn_partition_id));
- /*
- * We must always use the nofault function regardless of whether we
- * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
- * didn't, we'd never know that the other partition is down and would
- * keep sending IPIs and AMOs to it until the heartbeat times out.
- */
- (void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->
- variable), xp_nofault_PIOR_target));
-
- local_irq_restore(irq_flags);
-}
-
-static inline u64
-xpc_partition_engaged(u64 partid_mask)
-{
- AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO;
-
-
- /* return our partition's AMO variable ANDed with partid_mask */
- return (FETCHOP_LOAD_OP(TO_AMO((u64) &amo->variable), FETCHOP_LOAD) &
- partid_mask);
-}
-
-static inline u64
-xpc_partition_disengage_requested(u64 partid_mask)
-{
- AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO;
-
-
- /* return our partition's AMO variable ANDed with partid_mask */
- return (FETCHOP_LOAD_OP(TO_AMO((u64) &amo->variable), FETCHOP_LOAD) &
- partid_mask);
-}
-
-static inline void
-xpc_clear_partition_engaged(u64 partid_mask)
-{
- AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO;
-
-
- /* clear bit(s) based on partid_mask in our partition's AMO */
- FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND,
- ~partid_mask);
-}
-
-static inline void
-xpc_clear_partition_disengage_request(u64 partid_mask)
-{
- AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO;
-
-
- /* clear bit(s) based on partid_mask in our partition's AMO */
- FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND,
- ~partid_mask);
-}
-
-
-
-/*
- * The following set of macros and inlines are used for the sending and
- * receiving of IPIs (also known as IRQs). There are two flavors of IPIs,
- * one that is associated with partition activity (SGI_XPC_ACTIVATE) and
- * the other that is associated with channel activity (SGI_XPC_NOTIFY).
- */
-
-static inline u64
-xpc_IPI_receive(AMO_t *amo)
-{
- return FETCHOP_LOAD_OP(TO_AMO((u64) &amo->variable), FETCHOP_CLEAR);
-}
-
-
-static inline enum xpc_retval
-xpc_IPI_send(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector)
-{
- int ret = 0;
- unsigned long irq_flags;
-
-
- local_irq_save(irq_flags);
-
- FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_OR, flag);
- sn_send_IPI_phys(nasid, phys_cpuid, vector, 0);
-
- /*
- * We must always use the nofault function regardless of whether we
- * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
- * didn't, we'd never know that the other partition is down and would
- * keep sending IPIs and AMOs to it until the heartbeat times out.
- */
- ret = xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->variable),
- xp_nofault_PIOR_target));
-
- local_irq_restore(irq_flags);
-
- return ((ret == 0) ? xpcSuccess : xpcPioReadError);
-}
-
-
-/*
- * IPIs associated with SGI_XPC_ACTIVATE IRQ.
- */
-
-/*
- * Flag the appropriate AMO variable and send an IPI to the specified node.
- */
-static inline void
-xpc_activate_IRQ_send(u64 amos_page_pa, int from_nasid, int to_nasid,
- int to_phys_cpuid)
-{
- int w_index = XPC_NASID_W_INDEX(from_nasid);
- int b_index = XPC_NASID_B_INDEX(from_nasid);
- AMO_t *amos = (AMO_t *) __va(amos_page_pa +
- (XPC_ACTIVATE_IRQ_AMOS * sizeof(AMO_t)));
-
-
- (void) xpc_IPI_send(&amos[w_index], (1UL << b_index), to_nasid,
- to_phys_cpuid, SGI_XPC_ACTIVATE);
-}
-
-static inline void
-xpc_IPI_send_activate(struct xpc_vars *vars)
-{
- xpc_activate_IRQ_send(vars->amos_page_pa, cnodeid_to_nasid(0),
- vars->act_nasid, vars->act_phys_cpuid);
-}
-
-static inline void
-xpc_IPI_send_activated(struct xpc_partition *part)
-{
- xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0),
- part->remote_act_nasid, part->remote_act_phys_cpuid);
-}
-
-static inline void
-xpc_IPI_send_reactivate(struct xpc_partition *part)
-{
- xpc_activate_IRQ_send(xpc_vars->amos_page_pa, part->reactivate_nasid,
- xpc_vars->act_nasid, xpc_vars->act_phys_cpuid);
-}
-
-static inline void
-xpc_IPI_send_disengage(struct xpc_partition *part)
-{
- xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0),
- part->remote_act_nasid, part->remote_act_phys_cpuid);
-}
-
-
-/*
- * IPIs associated with SGI_XPC_NOTIFY IRQ.
- */
-
-/*
- * Send an IPI to the remote partition that is associated with the
- * specified channel.
- */
-#define XPC_NOTIFY_IRQ_SEND(_ch, _ipi_f, _irq_f) \
- xpc_notify_IRQ_send(_ch, _ipi_f, #_ipi_f, _irq_f)
-
-static inline void
-xpc_notify_IRQ_send(struct xpc_channel *ch, u8 ipi_flag, char *ipi_flag_string,
- unsigned long *irq_flags)
-{
- struct xpc_partition *part = &xpc_partitions[ch->partid];
- enum xpc_retval ret;
-
-
- if (likely(part->act_state != XPC_P_DEACTIVATING)) {
- ret = xpc_IPI_send(part->remote_IPI_amo_va,
- (u64) ipi_flag << (ch->number * 8),
- part->remote_IPI_nasid,
- part->remote_IPI_phys_cpuid,
- SGI_XPC_NOTIFY);
- dev_dbg(xpc_chan, "%s sent to partid=%d, channel=%d, ret=%d\n",
- ipi_flag_string, ch->partid, ch->number, ret);
- if (unlikely(ret != xpcSuccess)) {
- if (irq_flags != NULL) {
- spin_unlock_irqrestore(&ch->lock, *irq_flags);
- }
- XPC_DEACTIVATE_PARTITION(part, ret);
- if (irq_flags != NULL) {
- spin_lock_irqsave(&ch->lock, *irq_flags);
- }
- }
- }
-}
-
-
-/*
- * Make it look like the remote partition, which is associated with the
- * specified channel, sent us an IPI. This faked IPI will be handled
- * by xpc_dropped_IPI_check().
- */
-#define XPC_NOTIFY_IRQ_SEND_LOCAL(_ch, _ipi_f) \
- xpc_notify_IRQ_send_local(_ch, _ipi_f, #_ipi_f)
-
-static inline void
-xpc_notify_IRQ_send_local(struct xpc_channel *ch, u8 ipi_flag,
- char *ipi_flag_string)
-{
- struct xpc_partition *part = &xpc_partitions[ch->partid];
-
-
- FETCHOP_STORE_OP(TO_AMO((u64) &part->local_IPI_amo_va->variable),
- FETCHOP_OR, ((u64) ipi_flag << (ch->number * 8)));
- dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n",
- ipi_flag_string, ch->partid, ch->number);
-}
-
-
-/*
- * The sending and receiving of IPIs includes the setting of an AMO variable
- * to indicate the reason the IPI was sent. The 64-bit variable is divided
- * up into eight bytes, ordered from right to left. Byte zero pertains to
- * channel 0, byte one to channel 1, and so on. Each byte is described by
- * the following IPI flags.
- */
-
-#define XPC_IPI_CLOSEREQUEST 0x01
-#define XPC_IPI_CLOSEREPLY 0x02
-#define XPC_IPI_OPENREQUEST 0x04
-#define XPC_IPI_OPENREPLY 0x08
-#define XPC_IPI_MSGREQUEST 0x10
-
-
-/* given an AMO variable and a channel#, get its associated IPI flags */
-#define XPC_GET_IPI_FLAGS(_amo, _c) ((u8) (((_amo) >> ((_c) * 8)) & 0xff))
-#define XPC_SET_IPI_FLAGS(_amo, _c, _f) (_amo) |= ((u64) (_f) << ((_c) * 8))
-
-#define XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(_amo) ((_amo) & __IA64_UL_CONST(0x0f0f0f0f0f0f0f0f))
-#define XPC_ANY_MSG_IPI_FLAGS_SET(_amo) ((_amo) & __IA64_UL_CONST(0x1010101010101010))
-
-
-static inline void
-xpc_IPI_send_closerequest(struct xpc_channel *ch, unsigned long *irq_flags)
-{
- struct xpc_openclose_args *args = ch->local_openclose_args;
-
-
- args->reason = ch->reason;
-
- XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREQUEST, irq_flags);
-}
-
-static inline void
-xpc_IPI_send_closereply(struct xpc_channel *ch, unsigned long *irq_flags)
-{
- XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREPLY, irq_flags);
-}
-
-static inline void
-xpc_IPI_send_openrequest(struct xpc_channel *ch, unsigned long *irq_flags)
-{
- struct xpc_openclose_args *args = ch->local_openclose_args;
-
-
- args->msg_size = ch->msg_size;
- args->local_nentries = ch->local_nentries;
-
- XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREQUEST, irq_flags);
-}
-
-static inline void
-xpc_IPI_send_openreply(struct xpc_channel *ch, unsigned long *irq_flags)
-{
- struct xpc_openclose_args *args = ch->local_openclose_args;
-
-
- args->remote_nentries = ch->remote_nentries;
- args->local_nentries = ch->local_nentries;
- args->local_msgqueue_pa = __pa(ch->local_msgqueue);
-
- XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREPLY, irq_flags);
-}
-
-static inline void
-xpc_IPI_send_msgrequest(struct xpc_channel *ch)
-{
- XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_MSGREQUEST, NULL);
-}
-
-static inline void
-xpc_IPI_send_local_msgrequest(struct xpc_channel *ch)
-{
- XPC_NOTIFY_IRQ_SEND_LOCAL(ch, XPC_IPI_MSGREQUEST);
-}
-
-
-/*
- * Memory for XPC's AMO variables is allocated by the MSPEC driver. These
- * pages are located in the lowest granule. The lowest granule uses 4k pages
- * for cached references and an alternate TLB handler to never provide a
- * cacheable mapping for the entire region. This will prevent speculative
- * reading of cached copies of our lines from being issued which will cause
- * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64
- * AMO variables (based on XP_MAX_PARTITIONS) for message notification and an
- * additional 128 AMO variables (based on XP_NASID_MASK_WORDS) for partition
- * activation and 2 AMO variables for partition deactivation.
- */
-static inline AMO_t *
-xpc_IPI_init(int index)
-{
- AMO_t *amo = xpc_vars->amos_page + index;
-
-
- (void) xpc_IPI_receive(amo); /* clear AMO variable */
- return amo;
-}
-
-
-
-static inline enum xpc_retval
-xpc_map_bte_errors(bte_result_t error)
-{
- if (error == BTE_SUCCESS)
- return xpcSuccess;
-
- if (is_shub2()) {
- if (BTE_VALID_SH2_ERROR(error))
- return xpcBteSh2Start + error;
- return xpcBteUnmappedError;
- }
- switch (error) {
- case BTE_SUCCESS: return xpcSuccess;
- case BTEFAIL_DIR: return xpcBteDirectoryError;
- case BTEFAIL_POISON: return xpcBtePoisonError;
- case BTEFAIL_WERR: return xpcBteWriteError;
- case BTEFAIL_ACCESS: return xpcBteAccessError;
- case BTEFAIL_PWERR: return xpcBtePWriteError;
- case BTEFAIL_PRERR: return xpcBtePReadError;
- case BTEFAIL_TOUT: return xpcBteTimeOutError;
- case BTEFAIL_XTERR: return xpcBteXtalkError;
- case BTEFAIL_NOTAVAIL: return xpcBteNotAvailable;
- default: return xpcBteUnmappedError;
- }
-}
-
-
-
-/*
- * Check to see if there is any channel activity to/from the specified
- * partition.
- */
-static inline void
-xpc_check_for_channel_activity(struct xpc_partition *part)
-{
- u64 IPI_amo;
- unsigned long irq_flags;
-
-
- IPI_amo = xpc_IPI_receive(part->local_IPI_amo_va);
- if (IPI_amo == 0) {
- return;
- }
-
- spin_lock_irqsave(&part->IPI_lock, irq_flags);
- part->local_IPI_amo |= IPI_amo;
- spin_unlock_irqrestore(&part->IPI_lock, irq_flags);
-
- dev_dbg(xpc_chan, "received IPI from partid=%d, IPI_amo=0x%lx\n",
- XPC_PARTID(part), IPI_amo);
-
- xpc_wakeup_channel_mgr(part);
-}
-
-
-#endif /* _ASM_IA64_SN_XPC_H */
-
projects / mirror_ubuntu-zesty-kernel.git / commitdiff