* Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P.
* Alex Chiang <achiang@hp.com>
*
+ * Copyright (C) 2013 Huawei Tech. Co., Ltd.
+ * Jiang Liu <jiang.liu@huawei.com>
+ *
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
+#include <linux/list.h>
#include <linux/pci.h>
#include <linux/acpi.h>
-#include <acpi/acpi_bus.h>
-#include <acpi/acpi_drivers.h>
#include <linux/dmi.h>
static bool debug;
#define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */
struct acpi_pci_slot {
- acpi_handle root_handle; /* handle of the root bridge */
struct pci_slot *pci_slot; /* corresponding pci_slot */
struct list_head list; /* node in the list of slots */
};
-static int acpi_pci_slot_add(struct acpi_pci_root *root);
-static void acpi_pci_slot_remove(struct acpi_pci_root *root);
-
static LIST_HEAD(slot_list);
static DEFINE_MUTEX(slot_list_lock);
-static struct acpi_pci_driver acpi_pci_slot_driver = {
- .add = acpi_pci_slot_add,
- .remove = acpi_pci_slot_remove,
-};
static int
check_slot(acpi_handle handle, unsigned long long *sun)
return device;
}
-struct callback_args {
- acpi_walk_callback user_function; /* only for walk_p2p_bridge */
- struct pci_bus *pci_bus;
- acpi_handle root_handle;
-};
-
/*
- * register_slot
- *
- * Called once for each SxFy object in the namespace. Don't worry about
- * calling pci_create_slot multiple times for the same pci_bus:device,
- * since each subsequent call simply bumps the refcount on the pci_slot.
- *
- * The number of calls to pci_destroy_slot from unregister_slot is
- * symmetrical.
+ * Check whether handle has an associated slot and create PCI slot if it has.
*/
static acpi_status
register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
char name[SLOT_NAME_SIZE];
struct acpi_pci_slot *slot;
struct pci_slot *pci_slot;
- struct callback_args *parent_context = context;
- struct pci_bus *pci_bus = parent_context->pci_bus;
+ struct pci_bus *pci_bus = context;
device = check_slot(handle, &sun);
if (device < 0)
return AE_OK;
+ /*
+ * There may be multiple PCI functions associated with the same slot.
+ * Check whether PCI slot has already been created for this PCI device.
+ */
+ list_for_each_entry(slot, &slot_list, list) {
+ pci_slot = slot->pci_slot;
+ if (pci_slot->bus == pci_bus && pci_slot->number == device)
+ return AE_OK;
+ }
+
slot = kmalloc(sizeof(*slot), GFP_KERNEL);
if (!slot) {
err("%s: cannot allocate memory\n", __func__);
return AE_OK;
}
- slot->root_handle = parent_context->root_handle;
slot->pci_slot = pci_slot;
- INIT_LIST_HEAD(&slot->list);
- mutex_lock(&slot_list_lock);
list_add(&slot->list, &slot_list);
- mutex_unlock(&slot_list_lock);
get_device(&pci_bus->dev);
return AE_OK;
}
-/*
- * walk_p2p_bridge - discover and walk p2p bridges
- * @handle: points to an acpi_pci_root
- * @context: p2p_bridge_context pointer
- *
- * Note that when we call ourselves recursively, we pass a different
- * value of pci_bus in the child_context.
- */
-static acpi_status
-walk_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
-{
- int device, function;
- unsigned long long adr;
- acpi_status status;
- acpi_handle dummy_handle;
- acpi_walk_callback user_function;
-
- struct pci_dev *dev;
- struct pci_bus *pci_bus;
- struct callback_args child_context;
- struct callback_args *parent_context = context;
-
- pci_bus = parent_context->pci_bus;
- user_function = parent_context->user_function;
-
- status = acpi_get_handle(handle, "_ADR", &dummy_handle);
- if (ACPI_FAILURE(status))
- return AE_OK;
-
- status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
- if (ACPI_FAILURE(status))
- return AE_OK;
-
- device = (adr >> 16) & 0xffff;
- function = adr & 0xffff;
-
- dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
- if (!dev || !dev->subordinate)
- goto out;
-
- child_context.pci_bus = dev->subordinate;
- child_context.user_function = user_function;
- child_context.root_handle = parent_context->root_handle;
-
- dbg("p2p bridge walk, pci_bus = %x\n", dev->subordinate->number);
- status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
- user_function, NULL, &child_context, NULL);
- if (ACPI_FAILURE(status))
- goto out;
-
- status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
- walk_p2p_bridge, NULL, &child_context, NULL);
-out:
- pci_dev_put(dev);
- return AE_OK;
-}
-
-/*
- * walk_root_bridge - generic root bridge walker
- * @root: poiner of an acpi_pci_root
- * @user_function: user callback for slot objects
- *
- * Call user_function for all objects underneath this root bridge.
- * Walk p2p bridges underneath us and call user_function on those too.
- */
-static int
-walk_root_bridge(struct acpi_pci_root *root, acpi_walk_callback user_function)
-{
- acpi_status status;
- acpi_handle handle = root->device->handle;
- struct pci_bus *pci_bus = root->bus;
- struct callback_args context;
-
- context.pci_bus = pci_bus;
- context.user_function = user_function;
- context.root_handle = handle;
-
- dbg("root bridge walk, pci_bus = %x\n", pci_bus->number);
- status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
- user_function, NULL, &context, NULL);
- if (ACPI_FAILURE(status))
- return status;
-
- status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
- walk_p2p_bridge, NULL, &context, NULL);
- if (ACPI_FAILURE(status))
- err("%s: walk_p2p_bridge failure - %d\n", __func__, status);
-
- return status;
-}
-
-/*
- * acpi_pci_slot_add
- * @handle: points to an acpi_pci_root
- */
-static int
-acpi_pci_slot_add(struct acpi_pci_root *root)
+void acpi_pci_slot_enumerate(struct pci_bus *bus, acpi_handle handle)
{
- acpi_status status;
-
- status = walk_root_bridge(root, register_slot);
- if (ACPI_FAILURE(status))
- err("%s: register_slot failure - %d\n", __func__, status);
-
- return status;
+ mutex_lock(&slot_list_lock);
+ acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
+ register_slot, NULL, bus, NULL);
+ mutex_unlock(&slot_list_lock);
}
-/*
- * acpi_pci_slot_remove
- * @handle: points to an acpi_pci_root
- */
-static void
-acpi_pci_slot_remove(struct acpi_pci_root *root)
+void acpi_pci_slot_remove(struct pci_bus *bus)
{
struct acpi_pci_slot *slot, *tmp;
- struct pci_bus *pbus;
- acpi_handle handle = root->device->handle;
mutex_lock(&slot_list_lock);
list_for_each_entry_safe(slot, tmp, &slot_list, list) {
- if (slot->root_handle == handle) {
+ if (slot->pci_slot->bus == bus) {
list_del(&slot->list);
- pbus = slot->pci_slot->bus;
pci_destroy_slot(slot->pci_slot);
- put_device(&pbus->dev);
+ put_device(&bus->dev);
kfree(slot);
}
}
void __init acpi_pci_slot_init(void)
{
dmi_check_system(acpi_pci_slot_dmi_table);
- acpi_pci_register_driver(&acpi_pci_slot_driver);
}
#include "acpiphp.h"
static LIST_HEAD(bridge_list);
+static DEFINE_MUTEX(bridge_mutex);
#define MY_NAME "acpiphp_glue"
static void acpiphp_sanitize_bus(struct pci_bus *bus);
static void acpiphp_set_hpp_values(struct pci_bus *bus);
static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
+static void free_bridge(struct kref *kref);
/* callback routine to check for the existence of a pci dock device */
static acpi_status
}
}
+static inline void get_bridge(struct acpiphp_bridge *bridge)
+{
+ kref_get(&bridge->ref);
+}
+
+static inline void put_bridge(struct acpiphp_bridge *bridge)
+{
+ kref_put(&bridge->ref, free_bridge);
+}
+
+static void free_bridge(struct kref *kref)
+{
+ struct acpiphp_bridge *bridge;
+ struct acpiphp_slot *slot, *next;
+ struct acpiphp_func *func, *tmp;
+
+ bridge = container_of(kref, struct acpiphp_bridge, ref);
+
+ list_for_each_entry_safe(slot, next, &bridge->slots, node) {
+ list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
+ kfree(func);
+ }
+ kfree(slot);
+ }
+
+ /* Release reference acquired by acpiphp_bridge_handle_to_function() */
+ if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)
+ put_bridge(bridge->func->slot->bridge);
+ put_device(&bridge->pci_bus->dev);
+ pci_dev_put(bridge->pci_dev);
+ kfree(bridge);
+}
+
/*
* the _DCK method can do funny things... and sometimes not
* hah-hah funny.
acpi_handle tmp;
acpi_status status = AE_OK;
unsigned long long adr, sun;
- int device, function, retval;
+ int device, function, retval, found = 0;
struct pci_bus *pbus = bridge->pci_bus;
struct pci_dev *pdev;
+ u32 val;
if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle))
return AE_OK;
device = (adr >> 16) & 0xffff;
function = adr & 0xffff;
- pdev = pbus->self;
+ pdev = bridge->pci_dev;
if (pdev && device_is_managed_by_native_pciehp(pdev))
return AE_OK;
if (!newfunc)
return AE_NO_MEMORY;
- INIT_LIST_HEAD(&newfunc->sibling);
newfunc->handle = handle;
newfunc->function = function;
}
/* search for objects that share the same slot */
- for (slot = bridge->slots; slot; slot = slot->next)
+ list_for_each_entry(slot, &bridge->slots, node)
if (slot->device == device) {
if (slot->sun != sun)
warn("sibling found, but _SUN doesn't match!\n");
+ found = 1;
break;
}
- if (!slot) {
+ if (!found) {
slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
if (!slot) {
kfree(newfunc);
INIT_LIST_HEAD(&slot->funcs);
mutex_init(&slot->crit_sect);
- slot->next = bridge->slots;
- bridge->slots = slot;
-
+ mutex_lock(&bridge_mutex);
+ list_add_tail(&slot->node, &bridge->slots);
+ mutex_unlock(&bridge_mutex);
bridge->nr_slots++;
dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
}
newfunc->slot = slot;
+ mutex_lock(&bridge_mutex);
list_add_tail(&newfunc->sibling, &slot->funcs);
+ mutex_unlock(&bridge_mutex);
- pdev = pci_get_slot(pbus, PCI_DEVFN(device, function));
- if (pdev) {
+ if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
+ &val, 60*1000))
slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
- pci_dev_put(pdev);
- }
if (is_dock_device(handle)) {
/* we don't want to call this device's _EJ0
err_exit:
bridge->nr_slots--;
- bridge->slots = slot->next;
+ mutex_lock(&bridge_mutex);
+ list_del(&slot->node);
+ mutex_unlock(&bridge_mutex);
kfree(slot);
kfree(newfunc);
acpi_status status;
/* must be added to the list prior to calling register_slot */
+ mutex_lock(&bridge_mutex);
list_add(&bridge->list, &bridge_list);
+ mutex_unlock(&bridge_mutex);
/* register all slot objects under this bridge */
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
register_slot, NULL, bridge, NULL);
if (ACPI_FAILURE(status)) {
+ mutex_lock(&bridge_mutex);
list_del(&bridge->list);
+ mutex_unlock(&bridge_mutex);
return;
}
{
struct acpiphp_bridge *bridge;
struct acpiphp_slot *slot;
- struct acpiphp_func *func;
+ struct acpiphp_func *func = NULL;
+ mutex_lock(&bridge_mutex);
list_for_each_entry(bridge, &bridge_list, list) {
- for (slot = bridge->slots; slot; slot = slot->next) {
+ list_for_each_entry(slot, &bridge->slots, node) {
list_for_each_entry(func, &slot->funcs, sibling) {
- if (func->handle == handle)
+ if (func->handle == handle) {
+ get_bridge(func->slot->bridge);
+ mutex_unlock(&bridge_mutex);
return func;
+ }
}
}
}
+ mutex_unlock(&bridge_mutex);
return NULL;
}
-static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
-{
- acpi_handle dummy_handle;
- struct acpiphp_func *func;
-
- if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
- "_EJ0", &dummy_handle))) {
- bridge->flags |= BRIDGE_HAS_EJ0;
-
- dbg("found ejectable p2p bridge\n");
-
- /* make link between PCI bridge and PCI function */
- func = acpiphp_bridge_handle_to_function(bridge->handle);
- if (!func)
- return;
- bridge->func = func;
- func->bridge = bridge;
- }
-}
-
-
-/* allocate and initialize host bridge data structure */
-static void add_host_bridge(struct acpi_pci_root *root)
-{
- struct acpiphp_bridge *bridge;
- acpi_handle handle = root->device->handle;
-
- bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
- if (bridge == NULL)
- return;
-
- bridge->handle = handle;
-
- bridge->pci_bus = root->bus;
-
- init_bridge_misc(bridge);
-}
-
-
-/* allocate and initialize PCI-to-PCI bridge data structure */
-static void add_p2p_bridge(acpi_handle *handle)
-{
- struct acpiphp_bridge *bridge;
-
- bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
- if (bridge == NULL) {
- err("out of memory\n");
- return;
- }
-
- bridge->handle = handle;
- config_p2p_bridge_flags(bridge);
-
- bridge->pci_dev = acpi_get_pci_dev(handle);
- bridge->pci_bus = bridge->pci_dev->subordinate;
- if (!bridge->pci_bus) {
- err("This is not a PCI-to-PCI bridge!\n");
- goto err;
- }
-
- /*
- * Grab a ref to the subordinate PCI bus in case the bus is
- * removed via PCI core logical hotplug. The ref pins the bus
- * (which we access during module unload).
- */
- get_device(&bridge->pci_bus->dev);
-
- init_bridge_misc(bridge);
- return;
- err:
- pci_dev_put(bridge->pci_dev);
- kfree(bridge);
- return;
-}
-
-
-/* callback routine to find P2P bridges */
-static acpi_status
-find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
-{
- acpi_status status;
- struct pci_dev *dev;
-
- dev = acpi_get_pci_dev(handle);
- if (!dev || !dev->subordinate)
- goto out;
-
- /* check if this bridge has ejectable slots */
- if ((detect_ejectable_slots(handle) > 0)) {
- dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
- add_p2p_bridge(handle);
- }
-
- /* search P2P bridges under this p2p bridge */
- status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
- find_p2p_bridge, NULL, NULL, NULL);
- if (ACPI_FAILURE(status))
- warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
-
- out:
- pci_dev_put(dev);
- return AE_OK;
-}
-
-
-/* find hot-pluggable slots, and then find P2P bridge */
-static int add_bridge(struct acpi_pci_root *root)
-{
- acpi_status status;
- unsigned long long tmp;
- acpi_handle dummy_handle;
- acpi_handle handle = root->device->handle;
-
- /* if the bridge doesn't have _STA, we assume it is always there */
- status = acpi_get_handle(handle, "_STA", &dummy_handle);
- if (ACPI_SUCCESS(status)) {
- status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
- if (ACPI_FAILURE(status)) {
- dbg("%s: _STA evaluation failure\n", __func__);
- return 0;
- }
- if ((tmp & ACPI_STA_FUNCTIONING) == 0)
- /* don't register this object */
- return 0;
- }
-
- /* check if this bridge has ejectable slots */
- if (detect_ejectable_slots(handle) > 0) {
- dbg("found PCI host-bus bridge with hot-pluggable slots\n");
- add_host_bridge(root);
- }
-
- /* search P2P bridges under this host bridge */
- status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
- find_p2p_bridge, NULL, NULL, NULL);
-
- if (ACPI_FAILURE(status))
- warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
-
- return 0;
-}
-
static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
{
struct acpiphp_bridge *bridge;
+ mutex_lock(&bridge_mutex);
list_for_each_entry(bridge, &bridge_list, list)
- if (bridge->handle == handle)
+ if (bridge->handle == handle) {
+ get_bridge(bridge);
+ mutex_unlock(&bridge_mutex);
return bridge;
+ }
+ mutex_unlock(&bridge_mutex);
return NULL;
}
static void cleanup_bridge(struct acpiphp_bridge *bridge)
{
- struct acpiphp_slot *slot, *next;
- struct acpiphp_func *func, *tmp;
+ struct acpiphp_slot *slot;
+ struct acpiphp_func *func;
acpi_status status;
acpi_handle handle = bridge->handle;
err("failed to install interrupt notify handler\n");
}
- slot = bridge->slots;
- while (slot) {
- next = slot->next;
- list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
+ list_for_each_entry(slot, &bridge->slots, node) {
+ list_for_each_entry(func, &slot->funcs, sibling) {
if (is_dock_device(func->handle)) {
unregister_hotplug_dock_device(func->handle);
unregister_dock_notifier(&func->nb);
if (ACPI_FAILURE(status))
err("failed to remove notify handler\n");
}
- list_del(&func->sibling);
- kfree(func);
}
acpiphp_unregister_hotplug_slot(slot);
- list_del(&slot->funcs);
- kfree(slot);
- slot = next;
}
- /*
- * Only P2P bridges have a pci_dev
- */
- if (bridge->pci_dev)
- put_device(&bridge->pci_bus->dev);
-
- pci_dev_put(bridge->pci_dev);
+ mutex_lock(&bridge_mutex);
list_del(&bridge->list);
- kfree(bridge);
-}
-
-static acpi_status
-cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
-{
- struct acpiphp_bridge *bridge;
-
- /* cleanup p2p bridges under this P2P bridge
- in a depth-first manner */
- acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
- cleanup_p2p_bridge, NULL, NULL, NULL);
-
- bridge = acpiphp_handle_to_bridge(handle);
- if (bridge)
- cleanup_bridge(bridge);
-
- return AE_OK;
-}
-
-static void remove_bridge(struct acpi_pci_root *root)
-{
- struct acpiphp_bridge *bridge;
- acpi_handle handle = root->device->handle;
-
- /* cleanup p2p bridges under this host bridge
- in a depth-first manner */
- acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
- (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL);
-
- /*
- * On root bridges with hotplug slots directly underneath (ie,
- * no p2p bridge between), we call cleanup_bridge().
- *
- * The else clause cleans up root bridges that either had no
- * hotplug slots at all, or had a p2p bridge underneath.
- */
- bridge = acpiphp_handle_to_bridge(handle);
- if (bridge)
- cleanup_bridge(bridge);
+ mutex_unlock(&bridge_mutex);
}
static int power_on_slot(struct acpiphp_slot *slot)
}
}
}
+
/**
* enable_device - enable, configure a slot
* @slot: slot to be enabled
struct pci_dev *dev;
struct pci_bus *bus = slot->bridge->pci_bus;
struct acpiphp_func *func;
- int retval = 0;
int num, max, pass;
- acpi_status status;
if (slot->flags & SLOT_ENABLED)
goto err_exit;
slot->flags &= (~SLOT_ENABLED);
continue;
}
-
- if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
- dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
- pci_dev_put(dev);
- continue;
- }
-
- status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
- if (ACPI_FAILURE(status))
- warn("find_p2p_bridge failed (error code = 0x%x)\n",
- status);
- pci_dev_put(dev);
}
err_exit:
- return retval;
+ return 0;
}
/* return first device in slot, acquiring a reference on it */
{
struct acpiphp_func *func;
struct pci_dev *pdev;
- struct pci_bus *bus = slot->bridge->pci_bus;
-
- /* The slot will be enabled when func 0 is added, so check
- func 0 before disable the slot. */
- pdev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
- if (!pdev)
- goto err_exit;
- pci_dev_put(pdev);
-
- list_for_each_entry(func, &slot->funcs, sibling) {
- if (func->bridge) {
- /* cleanup p2p bridges under this P2P bridge */
- cleanup_p2p_bridge(func->bridge->handle,
- (u32)1, NULL, NULL);
- func->bridge = NULL;
- }
- }
/*
* enable_device() enumerates all functions in this device via
slot->flags &= (~SLOT_ENABLED);
-err_exit:
return 0;
}
enabled = disabled = 0;
- for (slot = bridge->slots; slot; slot = slot->next) {
+ list_for_each_entry(slot, &bridge->slots, node) {
unsigned int status = get_slot_status(slot);
if (slot->flags & SLOT_ENABLED) {
if (status == ACPI_STA_ALL)
*/
static void acpiphp_sanitize_bus(struct pci_bus *bus)
{
- struct pci_dev *dev;
+ struct pci_dev *dev, *tmp;
int i;
unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
- list_for_each_entry(dev, &bus->devices, bus_list) {
+ list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
struct resource *res = &dev->resource[i];
if ((res->flags & type_mask) && !res->start &&
dbg("%s: re-enumerating slots under %s\n",
__func__, objname);
acpiphp_check_bridge(bridge);
+ put_bridge(bridge);
}
return AE_OK ;
}
acpi_scan_lock_release();
kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
+ put_bridge(bridge);
}
/**
static void handle_hotplug_event_bridge(acpi_handle handle, u32 type,
void *context)
{
+ struct acpiphp_bridge *bridge = context;
+
/*
* Currently the code adds all hotplug events to the kacpid_wq
* queue when it should add hotplug events to the kacpi_hotplug_wq.
* For now just re-add this work to the kacpi_hotplug_wq so we
* don't deadlock on hotplug actions.
*/
+ get_bridge(bridge);
alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_bridge);
}
acpi_scan_lock_release();
kfree(hp_work); /* allocated in handle_hotplug_event_func */
+ put_bridge(func->slot->bridge);
}
/**
static void handle_hotplug_event_func(acpi_handle handle, u32 type,
void *context)
{
+ struct acpiphp_func *func = context;
+
/*
* Currently the code adds all hotplug events to the kacpid_wq
* queue when it should add hotplug events to the kacpi_hotplug_wq.
* For now just re-add this work to the kacpi_hotplug_wq so we
* don't deadlock on hotplug actions.
*/
+ get_bridge(func->slot->bridge);
alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_func);
}
-static struct acpi_pci_driver acpi_pci_hp_driver = {
- .add = add_bridge,
- .remove = remove_bridge,
-};
-
-/**
- * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
+/*
+ * Create hotplug slots for the PCI bus.
+ * It should always return 0 to avoid skipping following notifiers.
*/
-int __init acpiphp_glue_init(void)
+void acpiphp_enumerate_slots(struct pci_bus *bus, acpi_handle handle)
{
- acpi_pci_register_driver(&acpi_pci_hp_driver);
+ acpi_handle dummy_handle;
+ struct acpiphp_bridge *bridge;
- return 0;
-}
+ if (acpiphp_disabled)
+ return;
+ if (detect_ejectable_slots(handle) <= 0)
+ return;
-/**
- * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
- *
- * This function frees all data allocated in acpiphp_glue_init().
- */
-void acpiphp_glue_exit(void)
+ bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
+ if (bridge == NULL) {
+ err("out of memory\n");
+ return;
+ }
+
+ INIT_LIST_HEAD(&bridge->slots);
+ kref_init(&bridge->ref);
+ bridge->handle = handle;
+ bridge->pci_dev = pci_dev_get(bus->self);
+ bridge->pci_bus = bus;
+
+ /*
+ * Grab a ref to the subordinate PCI bus in case the bus is
+ * removed via PCI core logical hotplug. The ref pins the bus
+ * (which we access during module unload).
+ */
+ get_device(&bus->dev);
+
+ if (!pci_is_root_bus(bridge->pci_bus) &&
+ ACPI_SUCCESS(acpi_get_handle(bridge->handle,
+ "_EJ0", &dummy_handle))) {
+ dbg("found ejectable p2p bridge\n");
+ bridge->flags |= BRIDGE_HAS_EJ0;
+ bridge->func = acpiphp_bridge_handle_to_function(handle);
+ }
+
+ init_bridge_misc(bridge);
+}
+
+/* Destroy hotplug slots associated with the PCI bus */
+void acpiphp_remove_slots(struct pci_bus *bus)
{
- acpi_pci_unregister_driver(&acpi_pci_hp_driver);
+ struct acpiphp_bridge *bridge, *tmp;
+
+ if (acpiphp_disabled)
+ return;
+
+ list_for_each_entry_safe(bridge, tmp, &bridge_list, list)
+ if (bridge->pci_bus == bus) {
+ cleanup_bridge(bridge);
+ put_bridge(bridge);
+ break;
+ }
}
/**
sta = get_slot_status(slot);
- return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
+ return (sta & ACPI_STA_DEVICE_UI) ? 0 : 1;
}
projects / mirror_ubuntu-bionic-kernel.git / commitdiff