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CommitLineData
89eb8eb9
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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
a374c57b 6 * Copyright (c) 2004-2009 Silicon Graphics, Inc. All Rights Reserved.
89eb8eb9
DN
7 */
8
89eb8eb9
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9/*
10 * Cross Partition Communication (XPC) support - standard version.
11 *
12 * XPC provides a message passing capability that crosses partition
13 * boundaries. This module is made up of two parts:
14 *
15 * partition This part detects the presence/absence of other
16 * partitions. It provides a heartbeat and monitors
17 * the heartbeats of other partitions.
18 *
19 * channel This part manages the channels and sends/receives
20 * messages across them to/from other partitions.
21 *
22 * There are a couple of additional functions residing in XP, which
23 * provide an interface to XPC for its users.
24 *
25 *
26 * Caveats:
27 *
7fb5e59d 28 * . Currently on sn2, we have no way to determine which nasid an IRQ
c39838ce
DN
29 * came from. Thus, xpc_send_IRQ_sn2() does a remote amo write
30 * followed by an IPI. The amo indicates where data is to be pulled
31 * from, so after the IPI arrives, the remote partition checks the amo
32 * word. The IPI can actually arrive before the amo however, so other
33 * code must periodically check for this case. Also, remote amo
7fb5e59d
DN
34 * operations do not reliably time out. Thus we do a remote PIO read
35 * solely to know whether the remote partition is down and whether we
36 * should stop sending IPIs to it. This remote PIO read operation is
37 * set up in a special nofault region so SAL knows to ignore (and
c39838ce 38 * cleanup) any errors due to the remote amo write, PIO read, and/or
7fb5e59d 39 * PIO write operations.
89eb8eb9
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40 *
41 * If/when new hardware solves this IPI problem, we should abandon
42 * the current approach.
43 *
44 */
45
89eb8eb9 46#include <linux/module.h>
5a0e3ad6 47#include <linux/slab.h>
261f3b49
DN
48#include <linux/sysctl.h>
49#include <linux/device.h>
69913927 50#include <linux/delay.h>
a607c389 51#include <linux/reboot.h>
1eeb66a1 52#include <linux/kdebug.h>
2c2b94f9 53#include <linux/kthread.h>
45d9ca49 54#include "xpc.h"
89eb8eb9 55
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56/* define two XPC debug device structures to be used with dev_dbg() et al */
57
58struct device_driver xpc_dbg_name = {
59 .name = "xpc"
60};
61
62struct device xpc_part_dbg_subname = {
bb0dc43e 63 .init_name = "", /* set to "part" at xpc_init() time */
89eb8eb9
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64 .driver = &xpc_dbg_name
65};
66
67struct device xpc_chan_dbg_subname = {
bb0dc43e 68 .init_name = "", /* set to "chan" at xpc_init() time */
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69 .driver = &xpc_dbg_name
70};
71
72struct device *xpc_part = &xpc_part_dbg_subname;
73struct device *xpc_chan = &xpc_chan_dbg_subname;
74
1f4674b2
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75static int xpc_kdebug_ignore;
76
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77/* systune related variables for /proc/sys directories */
78
a607c389
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79static int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL;
80static int xpc_hb_min_interval = 1;
81static int xpc_hb_max_interval = 10;
89eb8eb9 82
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83static int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_INTERVAL;
84static int xpc_hb_check_min_interval = 10;
85static int xpc_hb_check_max_interval = 120;
89eb8eb9 86
a47d5dac
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87int xpc_disengage_timelimit = XPC_DISENGAGE_DEFAULT_TIMELIMIT;
88static int xpc_disengage_min_timelimit; /* = 0 */
89static int xpc_disengage_max_timelimit = 120;
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90
91static ctl_table xpc_sys_xpc_hb_dir[] = {
92 {
35190506
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93 .procname = "hb_interval",
94 .data = &xpc_hb_interval,
95 .maxlen = sizeof(int),
96 .mode = 0644,
6d456111 97 .proc_handler = proc_dointvec_minmax,
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98 .extra1 = &xpc_hb_min_interval,
99 .extra2 = &xpc_hb_max_interval},
89eb8eb9 100 {
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101 .procname = "hb_check_interval",
102 .data = &xpc_hb_check_interval,
103 .maxlen = sizeof(int),
104 .mode = 0644,
6d456111 105 .proc_handler = proc_dointvec_minmax,
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106 .extra1 = &xpc_hb_check_min_interval,
107 .extra2 = &xpc_hb_check_max_interval},
68cbf075 108 {}
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109};
110static ctl_table xpc_sys_xpc_dir[] = {
111 {
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112 .procname = "hb",
113 .mode = 0555,
114 .child = xpc_sys_xpc_hb_dir},
e54af724 115 {
a47d5dac
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116 .procname = "disengage_timelimit",
117 .data = &xpc_disengage_timelimit,
35190506
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118 .maxlen = sizeof(int),
119 .mode = 0644,
6d456111 120 .proc_handler = proc_dointvec_minmax,
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121 .extra1 = &xpc_disengage_min_timelimit,
122 .extra2 = &xpc_disengage_max_timelimit},
68cbf075 123 {}
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124};
125static ctl_table xpc_sys_dir[] = {
126 {
35190506
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127 .procname = "xpc",
128 .mode = 0555,
129 .child = xpc_sys_xpc_dir},
68cbf075 130 {}
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131};
132static struct ctl_table_header *xpc_sysctl;
133
a47d5dac
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134/* non-zero if any remote partition disengage was timed out */
135int xpc_disengage_timedout;
89eb8eb9 136
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137/* #of activate IRQs received and not yet processed */
138int xpc_activate_IRQ_rcvd;
139DEFINE_SPINLOCK(xpc_activate_IRQ_rcvd_lock);
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140
141/* IRQ handler notifies this wait queue on receipt of an IRQ */
6e41017a 142DECLARE_WAIT_QUEUE_HEAD(xpc_activate_IRQ_wq);
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143
144static unsigned long xpc_hb_check_timeout;
33ba3c77 145static struct timer_list xpc_hb_timer;
89eb8eb9 146
e54af724 147/* notification that the xpc_hb_checker thread has exited */
f9e505a9 148static DECLARE_COMPLETION(xpc_hb_checker_exited);
89eb8eb9 149
e54af724 150/* notification that the xpc_discovery thread has exited */
f9e505a9 151static DECLARE_COMPLETION(xpc_discovery_exited);
89eb8eb9 152
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153static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *);
154
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155static int xpc_system_reboot(struct notifier_block *, unsigned long, void *);
156static struct notifier_block xpc_reboot_notifier = {
157 .notifier_call = xpc_system_reboot,
158};
159
780d09e8
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160static int xpc_system_die(struct notifier_block *, unsigned long, void *);
161static struct notifier_block xpc_die_notifier = {
162 .notifier_call = xpc_system_die,
163};
164
a7665b0a 165struct xpc_arch_operations xpc_arch_ops;
94bd2708 166
a607c389 167/*
a47d5dac 168 * Timer function to enforce the timelimit on the partition disengage.
a607c389
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169 */
170static void
a47d5dac 171xpc_timeout_partition_disengage(unsigned long data)
a607c389 172{
35190506 173 struct xpc_partition *part = (struct xpc_partition *)data;
a607c389 174
a47d5dac 175 DBUG_ON(time_is_after_jiffies(part->disengage_timeout));
a607c389 176
35190506 177 (void)xpc_partition_disengaged(part);
a607c389 178
a47d5dac 179 DBUG_ON(part->disengage_timeout != 0);
a7665b0a 180 DBUG_ON(xpc_arch_ops.partition_engaged(XPC_PARTID(part)));
a607c389
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181}
182
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183/*
184 * Timer to produce the heartbeat. The timer structures function is
185 * already set when this is initially called. A tunable is used to
186 * specify when the next timeout should occur.
187 */
188static void
189xpc_hb_beater(unsigned long dummy)
190{
a7665b0a 191 xpc_arch_ops.increment_heartbeat();
89eb8eb9 192
aaa3cd69 193 if (time_is_before_eq_jiffies(xpc_hb_check_timeout))
6e41017a 194 wake_up_interruptible(&xpc_activate_IRQ_wq);
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195
196 xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ);
197 add_timer(&xpc_hb_timer);
198}
199
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200static void
201xpc_start_hb_beater(void)
202{
a7665b0a 203 xpc_arch_ops.heartbeat_init();
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204 init_timer(&xpc_hb_timer);
205 xpc_hb_timer.function = xpc_hb_beater;
206 xpc_hb_beater(0);
207}
208
209static void
210xpc_stop_hb_beater(void)
211{
212 del_timer_sync(&xpc_hb_timer);
a7665b0a 213 xpc_arch_ops.heartbeat_exit();
33ba3c77
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214}
215
61deb86e
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216/*
217 * At periodic intervals, scan through all active partitions and ensure
218 * their heartbeat is still active. If not, the partition is deactivated.
219 */
220static void
221xpc_check_remote_hb(void)
222{
223 struct xpc_partition *part;
224 short partid;
225 enum xp_retval ret;
226
227 for (partid = 0; partid < xp_max_npartitions; partid++) {
228
229 if (xpc_exiting)
230 break;
231
232 if (partid == xp_partition_id)
233 continue;
234
235 part = &xpc_partitions[partid];
236
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237 if (part->act_state == XPC_P_AS_INACTIVE ||
238 part->act_state == XPC_P_AS_DEACTIVATING) {
61deb86e
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239 continue;
240 }
241
a7665b0a 242 ret = xpc_arch_ops.get_remote_heartbeat(part);
61deb86e
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243 if (ret != xpSuccess)
244 XPC_DEACTIVATE_PARTITION(part, ret);
245 }
246}
247
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248/*
249 * This thread is responsible for nearly all of the partition
250 * activation/deactivation.
251 */
252static int
253xpc_hb_checker(void *ignore)
254{
35190506 255 int force_IRQ = 0;
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256
257 /* this thread was marked active by xpc_hb_init() */
258
f7df8ed1 259 set_cpus_allowed_ptr(current, cpumask_of(XPC_HB_CHECK_CPU));
89eb8eb9 260
4c013f5c 261 /* set our heartbeating to other partitions into motion */
89eb8eb9 262 xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ);
33ba3c77 263 xpc_start_hb_beater();
89eb8eb9 264
2c2b94f9 265 while (!xpc_exiting) {
89eb8eb9 266
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267 dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have "
268 "been received\n",
35190506 269 (int)(xpc_hb_check_timeout - jiffies),
5b8669df 270 xpc_activate_IRQ_rcvd);
89eb8eb9 271
89eb8eb9 272 /* checking of remote heartbeats is skewed by IRQ handling */
aaa3cd69 273 if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) {
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274 xpc_hb_check_timeout = jiffies +
275 (xpc_hb_check_interval * HZ);
276
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277 dev_dbg(xpc_part, "checking remote heartbeats\n");
278 xpc_check_remote_hb();
279
280 /*
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281 * On sn2 we need to periodically recheck to ensure no
282 * IRQ/amo pairs have been missed.
89eb8eb9 283 */
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284 if (is_shub())
285 force_IRQ = 1;
89eb8eb9
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286 }
287
a607c389 288 /* check for outstanding IRQs */
5b8669df 289 if (xpc_activate_IRQ_rcvd > 0 || force_IRQ != 0) {
89eb8eb9 290 force_IRQ = 0;
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291 dev_dbg(xpc_part, "processing activate IRQs "
292 "received\n");
a7665b0a 293 xpc_arch_ops.process_activate_IRQ_rcvd();
89eb8eb9 294 }
a607c389
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295
296 /* wait for IRQ or timeout */
6e41017a 297 (void)wait_event_interruptible(xpc_activate_IRQ_wq,
5b8669df 298 (time_is_before_eq_jiffies(
aaa3cd69 299 xpc_hb_check_timeout) ||
5b8669df 300 xpc_activate_IRQ_rcvd > 0 ||
2c2b94f9 301 xpc_exiting));
89eb8eb9
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302 }
303
33ba3c77
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304 xpc_stop_hb_beater();
305
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306 dev_dbg(xpc_part, "heartbeat checker is exiting\n");
307
e54af724 308 /* mark this thread as having exited */
f9e505a9 309 complete(&xpc_hb_checker_exited);
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310 return 0;
311}
312
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313/*
314 * This thread will attempt to discover other partitions to activate
315 * based on info provided by SAL. This new thread is short lived and
316 * will exit once discovery is complete.
317 */
318static int
319xpc_initiate_discovery(void *ignore)
320{
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321 xpc_discovery();
322
323 dev_dbg(xpc_part, "discovery thread is exiting\n");
324
e54af724 325 /* mark this thread as having exited */
f9e505a9 326 complete(&xpc_discovery_exited);
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327 return 0;
328}
329
89eb8eb9
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330/*
331 * The first kthread assigned to a newly activated partition is the one
e17d416b 332 * created by XPC HB with which it calls xpc_activating(). XPC hangs on to
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333 * that kthread until the partition is brought down, at which time that kthread
334 * returns back to XPC HB. (The return of that kthread will signify to XPC HB
335 * that XPC has dismantled all communication infrastructure for the associated
336 * partition.) This kthread becomes the channel manager for that partition.
337 *
338 * Each active partition has a channel manager, who, besides connecting and
339 * disconnecting channels, will ensure that each of the partition's connected
340 * channels has the required number of assigned kthreads to get the work done.
341 */
342static void
343xpc_channel_mgr(struct xpc_partition *part)
344{
83469b55 345 while (part->act_state != XPC_P_AS_DEACTIVATING ||
35190506
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346 atomic_read(&part->nchannels_active) > 0 ||
347 !xpc_partition_disengaged(part)) {
89eb8eb9 348
7fb5e59d 349 xpc_process_sent_chctl_flags(part);
89eb8eb9 350
89eb8eb9
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351 /*
352 * Wait until we've been requested to activate kthreads or
353 * all of the channel's message queues have been torn down or
354 * a signal is pending.
355 *
356 * The channel_mgr_requests is set to 1 after being awakened,
357 * This is done to prevent the channel mgr from making one pass
358 * through the loop for each request, since he will
359 * be servicing all the requests in one pass. The reason it's
360 * set to 1 instead of 0 is so that other kthreads will know
361 * that the channel mgr is running and won't bother trying to
362 * wake him up.
363 */
364 atomic_dec(&part->channel_mgr_requests);
35190506 365 (void)wait_event_interruptible(part->channel_mgr_wq,
2c2b94f9 366 (atomic_read(&part->channel_mgr_requests) > 0 ||
7fb5e59d 367 part->chctl.all_flags != 0 ||
83469b55 368 (part->act_state == XPC_P_AS_DEACTIVATING &&
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369 atomic_read(&part->nchannels_active) == 0 &&
370 xpc_partition_disengaged(part))));
89eb8eb9 371 atomic_set(&part->channel_mgr_requests, 1);
89eb8eb9
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372 }
373}
374
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375/*
376 * Guarantee that the kzalloc'd memory is cacheline aligned.
377 */
378void *
379xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
380{
381 /* see if kzalloc will give us cachline aligned memory by default */
382 *base = kzalloc(size, flags);
383 if (*base == NULL)
384 return NULL;
385
386 if ((u64)*base == L1_CACHE_ALIGN((u64)*base))
387 return *base;
388
389 kfree(*base);
390
391 /* nope, we'll have to do it ourselves */
392 *base = kzalloc(size + L1_CACHE_BYTES, flags);
393 if (*base == NULL)
394 return NULL;
395
396 return (void *)L1_CACHE_ALIGN((u64)*base);
397}
398
399/*
400 * Setup the channel structures necessary to support XPartition Communication
401 * between the specified remote partition and the local one.
402 */
403static enum xp_retval
404xpc_setup_ch_structures(struct xpc_partition *part)
405{
406 enum xp_retval ret;
407 int ch_number;
408 struct xpc_channel *ch;
409 short partid = XPC_PARTID(part);
410
411 /*
412 * Allocate all of the channel structures as a contiguous chunk of
413 * memory.
414 */
415 DBUG_ON(part->channels != NULL);
416 part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_MAX_NCHANNELS,
417 GFP_KERNEL);
418 if (part->channels == NULL) {
419 dev_err(xpc_chan, "can't get memory for channels\n");
420 return xpNoMemory;
421 }
422
423 /* allocate the remote open and close args */
424
425 part->remote_openclose_args =
426 xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE,
427 GFP_KERNEL, &part->
428 remote_openclose_args_base);
429 if (part->remote_openclose_args == NULL) {
430 dev_err(xpc_chan, "can't get memory for remote connect args\n");
431 ret = xpNoMemory;
432 goto out_1;
433 }
434
435 part->chctl.all_flags = 0;
436 spin_lock_init(&part->chctl_lock);
437
438 atomic_set(&part->channel_mgr_requests, 1);
439 init_waitqueue_head(&part->channel_mgr_wq);
440
441 part->nchannels = XPC_MAX_NCHANNELS;
442
443 atomic_set(&part->nchannels_active, 0);
444 atomic_set(&part->nchannels_engaged, 0);
445
446 for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
447 ch = &part->channels[ch_number];
448
449 ch->partid = partid;
450 ch->number = ch_number;
451 ch->flags = XPC_C_DISCONNECTED;
452
453 atomic_set(&ch->kthreads_assigned, 0);
454 atomic_set(&ch->kthreads_idle, 0);
455 atomic_set(&ch->kthreads_active, 0);
456
457 atomic_set(&ch->references, 0);
458 atomic_set(&ch->n_to_notify, 0);
459
460 spin_lock_init(&ch->lock);
461 init_completion(&ch->wdisconnect_wait);
462
463 atomic_set(&ch->n_on_msg_allocate_wq, 0);
464 init_waitqueue_head(&ch->msg_allocate_wq);
465 init_waitqueue_head(&ch->idle_wq);
466 }
467
a7665b0a 468 ret = xpc_arch_ops.setup_ch_structures(part);
5b8669df
DN
469 if (ret != xpSuccess)
470 goto out_2;
471
472 /*
473 * With the setting of the partition setup_state to XPC_P_SS_SETUP,
474 * we're declaring that this partition is ready to go.
475 */
476 part->setup_state = XPC_P_SS_SETUP;
477
478 return xpSuccess;
479
480 /* setup of ch structures failed */
481out_2:
482 kfree(part->remote_openclose_args_base);
483 part->remote_openclose_args = NULL;
484out_1:
485 kfree(part->channels);
486 part->channels = NULL;
487 return ret;
488}
489
490/*
491 * Teardown the channel structures necessary to support XPartition Communication
492 * between the specified remote partition and the local one.
493 */
494static void
495xpc_teardown_ch_structures(struct xpc_partition *part)
496{
497 DBUG_ON(atomic_read(&part->nchannels_engaged) != 0);
498 DBUG_ON(atomic_read(&part->nchannels_active) != 0);
499
500 /*
501 * Make this partition inaccessible to local processes by marking it
502 * as no longer setup. Then wait before proceeding with the teardown
503 * until all existing references cease.
504 */
505 DBUG_ON(part->setup_state != XPC_P_SS_SETUP);
506 part->setup_state = XPC_P_SS_WTEARDOWN;
507
508 wait_event(part->teardown_wq, (atomic_read(&part->references) == 0));
509
510 /* now we can begin tearing down the infrastructure */
511
a7665b0a 512 xpc_arch_ops.teardown_ch_structures(part);
5b8669df
DN
513
514 kfree(part->remote_openclose_args_base);
515 part->remote_openclose_args = NULL;
516 kfree(part->channels);
517 part->channels = NULL;
518
519 part->setup_state = XPC_P_SS_TORNDOWN;
520}
521
89eb8eb9
DN
522/*
523 * When XPC HB determines that a partition has come up, it will create a new
524 * kthread and that kthread will call this function to attempt to set up the
525 * basic infrastructure used for Cross Partition Communication with the newly
526 * upped partition.
527 *
528 * The kthread that was created by XPC HB and which setup the XPC
e17d416b
DN
529 * infrastructure will remain assigned to the partition becoming the channel
530 * manager for that partition until the partition is deactivating, at which
531 * time the kthread will teardown the XPC infrastructure and then exit.
89eb8eb9 532 */
89eb8eb9
DN
533static int
534xpc_activating(void *__partid)
535{
64d032ba 536 short partid = (u64)__partid;
89eb8eb9
DN
537 struct xpc_partition *part = &xpc_partitions[partid];
538 unsigned long irq_flags;
89eb8eb9 539
bc63d387 540 DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
89eb8eb9
DN
541
542 spin_lock_irqsave(&part->act_lock, irq_flags);
543
83469b55
DN
544 if (part->act_state == XPC_P_AS_DEACTIVATING) {
545 part->act_state = XPC_P_AS_INACTIVE;
89eb8eb9
DN
546 spin_unlock_irqrestore(&part->act_lock, irq_flags);
547 part->remote_rp_pa = 0;
548 return 0;
549 }
550
551 /* indicate the thread is activating */
83469b55
DN
552 DBUG_ON(part->act_state != XPC_P_AS_ACTIVATION_REQ);
553 part->act_state = XPC_P_AS_ACTIVATING;
89eb8eb9
DN
554
555 XPC_SET_REASON(part, 0, 0);
556 spin_unlock_irqrestore(&part->act_lock, irq_flags);
557
e17d416b 558 dev_dbg(xpc_part, "activating partition %d\n", partid);
89eb8eb9 559
a7665b0a 560 xpc_arch_ops.allow_hb(partid);
89eb8eb9 561
5b8669df 562 if (xpc_setup_ch_structures(part) == xpSuccess) {
e17d416b
DN
563 (void)xpc_part_ref(part); /* this will always succeed */
564
a7665b0a 565 if (xpc_arch_ops.make_first_contact(part) == xpSuccess) {
e17d416b
DN
566 xpc_mark_partition_active(part);
567 xpc_channel_mgr(part);
568 /* won't return until partition is deactivating */
569 }
570
571 xpc_part_deref(part);
5b8669df 572 xpc_teardown_ch_structures(part);
e17d416b 573 }
89eb8eb9 574
a7665b0a 575 xpc_arch_ops.disallow_hb(partid);
89eb8eb9
DN
576 xpc_mark_partition_inactive(part);
577
65c17b80 578 if (part->reason == xpReactivating) {
89eb8eb9 579 /* interrupting ourselves results in activating partition */
a7665b0a 580 xpc_arch_ops.request_partition_reactivation(part);
89eb8eb9
DN
581 }
582
583 return 0;
584}
585
89eb8eb9
DN
586void
587xpc_activate_partition(struct xpc_partition *part)
588{
64d032ba 589 short partid = XPC_PARTID(part);
89eb8eb9 590 unsigned long irq_flags;
2c2b94f9 591 struct task_struct *kthread;
89eb8eb9 592
89eb8eb9
DN
593 spin_lock_irqsave(&part->act_lock, irq_flags);
594
83469b55 595 DBUG_ON(part->act_state != XPC_P_AS_INACTIVE);
89eb8eb9 596
83469b55 597 part->act_state = XPC_P_AS_ACTIVATION_REQ;
65c17b80 598 XPC_SET_REASON(part, xpCloneKThread, __LINE__);
89eb8eb9
DN
599
600 spin_unlock_irqrestore(&part->act_lock, irq_flags);
7c6c6636 601
2c2b94f9
DN
602 kthread = kthread_run(xpc_activating, (void *)((u64)partid), "xpc%02d",
603 partid);
604 if (IS_ERR(kthread)) {
7c6c6636 605 spin_lock_irqsave(&part->act_lock, irq_flags);
83469b55 606 part->act_state = XPC_P_AS_INACTIVE;
65c17b80 607 XPC_SET_REASON(part, xpCloneKThreadFailed, __LINE__);
7c6c6636
RH
608 spin_unlock_irqrestore(&part->act_lock, irq_flags);
609 }
89eb8eb9
DN
610}
611
89eb8eb9
DN
612void
613xpc_activate_kthreads(struct xpc_channel *ch, int needed)
614{
615 int idle = atomic_read(&ch->kthreads_idle);
616 int assigned = atomic_read(&ch->kthreads_assigned);
617 int wakeup;
618
89eb8eb9
DN
619 DBUG_ON(needed <= 0);
620
621 if (idle > 0) {
622 wakeup = (needed > idle) ? idle : needed;
623 needed -= wakeup;
624
625 dev_dbg(xpc_chan, "wakeup %d idle kthreads, partid=%d, "
626 "channel=%d\n", wakeup, ch->partid, ch->number);
627
628 /* only wakeup the requested number of kthreads */
629 wake_up_nr(&ch->idle_wq, wakeup);
630 }
631
2c2b94f9 632 if (needed <= 0)
89eb8eb9 633 return;
89eb8eb9
DN
634
635 if (needed + assigned > ch->kthreads_assigned_limit) {
636 needed = ch->kthreads_assigned_limit - assigned;
2c2b94f9 637 if (needed <= 0)
89eb8eb9 638 return;
89eb8eb9
DN
639 }
640
641 dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n",
642 needed, ch->partid, ch->number);
643
a460ef8d 644 xpc_create_kthreads(ch, needed, 0);
89eb8eb9
DN
645}
646
89eb8eb9
DN
647/*
648 * This function is where XPC's kthreads wait for messages to deliver.
649 */
650static void
651xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch)
652{
a7665b0a
RH
653 int (*n_of_deliverable_payloads) (struct xpc_channel *) =
654 xpc_arch_ops.n_of_deliverable_payloads;
655
89eb8eb9
DN
656 do {
657 /* deliver messages to their intended recipients */
658
a7665b0a 659 while (n_of_deliverable_payloads(ch) > 0 &&
2c2b94f9 660 !(ch->flags & XPC_C_DISCONNECTING)) {
bd3e64c1 661 xpc_deliver_payload(ch);
89eb8eb9
DN
662 }
663
664 if (atomic_inc_return(&ch->kthreads_idle) >
35190506 665 ch->kthreads_idle_limit) {
89eb8eb9
DN
666 /* too many idle kthreads on this channel */
667 atomic_dec(&ch->kthreads_idle);
668 break;
669 }
670
671 dev_dbg(xpc_chan, "idle kthread calling "
672 "wait_event_interruptible_exclusive()\n");
673
35190506 674 (void)wait_event_interruptible_exclusive(ch->idle_wq,
a7665b0a 675 (n_of_deliverable_payloads(ch) > 0 ||
2c2b94f9 676 (ch->flags & XPC_C_DISCONNECTING)));
89eb8eb9
DN
677
678 atomic_dec(&ch->kthreads_idle);
679
2c2b94f9 680 } while (!(ch->flags & XPC_C_DISCONNECTING));
89eb8eb9
DN
681}
682
89eb8eb9 683static int
2c2b94f9 684xpc_kthread_start(void *args)
89eb8eb9 685{
64d032ba 686 short partid = XPC_UNPACK_ARG1(args);
89eb8eb9
DN
687 u16 ch_number = XPC_UNPACK_ARG2(args);
688 struct xpc_partition *part = &xpc_partitions[partid];
689 struct xpc_channel *ch;
690 int n_needed;
e54af724 691 unsigned long irq_flags;
a7665b0a
RH
692 int (*n_of_deliverable_payloads) (struct xpc_channel *) =
693 xpc_arch_ops.n_of_deliverable_payloads;
89eb8eb9 694
89eb8eb9
DN
695 dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n",
696 partid, ch_number);
697
698 ch = &part->channels[ch_number];
699
700 if (!(ch->flags & XPC_C_DISCONNECTING)) {
89eb8eb9
DN
701
702 /* let registerer know that connection has been established */
703
e54af724 704 spin_lock_irqsave(&ch->lock, irq_flags);
4c2cd966
DN
705 if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) {
706 ch->flags |= XPC_C_CONNECTEDCALLOUT;
e54af724
DN
707 spin_unlock_irqrestore(&ch->lock, irq_flags);
708
89eb8eb9
DN
709 xpc_connected_callout(ch);
710
4c2cd966
DN
711 spin_lock_irqsave(&ch->lock, irq_flags);
712 ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE;
713 spin_unlock_irqrestore(&ch->lock, irq_flags);
714
89eb8eb9
DN
715 /*
716 * It is possible that while the callout was being
717 * made that the remote partition sent some messages.
718 * If that is the case, we may need to activate
719 * additional kthreads to help deliver them. We only
720 * need one less than total #of messages to deliver.
721 */
a7665b0a 722 n_needed = n_of_deliverable_payloads(ch) - 1;
2c2b94f9 723 if (n_needed > 0 && !(ch->flags & XPC_C_DISCONNECTING))
89eb8eb9 724 xpc_activate_kthreads(ch, n_needed);
2c2b94f9 725
e54af724
DN
726 } else {
727 spin_unlock_irqrestore(&ch->lock, irq_flags);
89eb8eb9
DN
728 }
729
730 xpc_kthread_waitmsgs(part, ch);
731 }
732
a460ef8d 733 /* let registerer know that connection is disconnecting */
e54af724 734
a460ef8d
DN
735 spin_lock_irqsave(&ch->lock, irq_flags);
736 if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
35190506 737 !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
a460ef8d 738 ch->flags |= XPC_C_DISCONNECTINGCALLOUT;
4c2cd966 739 spin_unlock_irqrestore(&ch->lock, irq_flags);
a460ef8d 740
65c17b80 741 xpc_disconnect_callout(ch, xpDisconnecting);
a460ef8d
DN
742
743 spin_lock_irqsave(&ch->lock, irq_flags);
744 ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE;
745 }
746 spin_unlock_irqrestore(&ch->lock, irq_flags);
747
a47d5dac
DN
748 if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
749 atomic_dec_return(&part->nchannels_engaged) == 0) {
a7665b0a 750 xpc_arch_ops.indicate_partition_disengaged(part);
89eb8eb9
DN
751 }
752
89eb8eb9
DN
753 xpc_msgqueue_deref(ch);
754
755 dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n",
756 partid, ch_number);
757
758 xpc_part_deref(part);
759 return 0;
760}
761
89eb8eb9
DN
762/*
763 * For each partition that XPC has established communications with, there is
764 * a minimum of one kernel thread assigned to perform any operation that
765 * may potentially sleep or block (basically the callouts to the asynchronous
766 * functions registered via xpc_connect()).
767 *
768 * Additional kthreads are created and destroyed by XPC as the workload
769 * demands.
770 *
771 * A kthread is assigned to one of the active channels that exists for a given
772 * partition.
773 */
774void
a460ef8d 775xpc_create_kthreads(struct xpc_channel *ch, int needed,
35190506 776 int ignore_disconnecting)
89eb8eb9
DN
777{
778 unsigned long irq_flags;
89eb8eb9 779 u64 args = XPC_PACK_ARGS(ch->partid, ch->number);
a607c389 780 struct xpc_partition *part = &xpc_partitions[ch->partid];
2c2b94f9 781 struct task_struct *kthread;
a7665b0a
RH
782 void (*indicate_partition_disengaged) (struct xpc_partition *) =
783 xpc_arch_ops.indicate_partition_disengaged;
89eb8eb9 784
89eb8eb9 785 while (needed-- > 0) {
e54af724
DN
786
787 /*
788 * The following is done on behalf of the newly created
789 * kthread. That kthread is responsible for doing the
790 * counterpart to the following before it exits.
791 */
a460ef8d
DN
792 if (ignore_disconnecting) {
793 if (!atomic_inc_not_zero(&ch->kthreads_assigned)) {
794 /* kthreads assigned had gone to zero */
795 BUG_ON(!(ch->flags &
35190506 796 XPC_C_DISCONNECTINGCALLOUT_MADE));
a460ef8d
DN
797 break;
798 }
799
800 } else if (ch->flags & XPC_C_DISCONNECTING) {
801 break;
802
a47d5dac
DN
803 } else if (atomic_inc_return(&ch->kthreads_assigned) == 1 &&
804 atomic_inc_return(&part->nchannels_engaged) == 1) {
a7665b0a 805 xpc_arch_ops.indicate_partition_engaged(part);
a460ef8d 806 }
35190506 807 (void)xpc_part_ref(part);
e54af724 808 xpc_msgqueue_ref(ch);
e54af724 809
2c2b94f9
DN
810 kthread = kthread_run(xpc_kthread_start, (void *)args,
811 "xpc%02dc%d", ch->partid, ch->number);
812 if (IS_ERR(kthread)) {
89eb8eb9 813 /* the fork failed */
a460ef8d
DN
814
815 /*
816 * NOTE: if (ignore_disconnecting &&
817 * !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) is true,
818 * then we'll deadlock if all other kthreads assigned
819 * to this channel are blocked in the channel's
820 * registerer, because the only thing that will unblock
65c17b80 821 * them is the xpDisconnecting callout that this
2c2b94f9 822 * failed kthread_run() would have made.
a460ef8d
DN
823 */
824
e54af724
DN
825 if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
826 atomic_dec_return(&part->nchannels_engaged) == 0) {
a7665b0a 827 indicate_partition_disengaged(part);
e54af724
DN
828 }
829 xpc_msgqueue_deref(ch);
830 xpc_part_deref(part);
89eb8eb9
DN
831
832 if (atomic_read(&ch->kthreads_assigned) <
35190506 833 ch->kthreads_idle_limit) {
89eb8eb9
DN
834 /*
835 * Flag this as an error only if we have an
836 * insufficient #of kthreads for the channel
837 * to function.
89eb8eb9
DN
838 */
839 spin_lock_irqsave(&ch->lock, irq_flags);
65c17b80 840 XPC_DISCONNECT_CHANNEL(ch, xpLackOfResources,
35190506 841 &irq_flags);
89eb8eb9
DN
842 spin_unlock_irqrestore(&ch->lock, irq_flags);
843 }
844 break;
845 }
89eb8eb9
DN
846 }
847}
848
89eb8eb9
DN
849void
850xpc_disconnect_wait(int ch_number)
851{
a607c389 852 unsigned long irq_flags;
64d032ba 853 short partid;
89eb8eb9
DN
854 struct xpc_partition *part;
855 struct xpc_channel *ch;
e54af724 856 int wakeup_channel_mgr;
89eb8eb9 857
89eb8eb9 858 /* now wait for all callouts to the caller's function to cease */
bc63d387 859 for (partid = 0; partid < xp_max_npartitions; partid++) {
89eb8eb9
DN
860 part = &xpc_partitions[partid];
861
2c2b94f9 862 if (!xpc_part_ref(part))
e54af724 863 continue;
89eb8eb9 864
e54af724 865 ch = &part->channels[ch_number];
89eb8eb9 866
e54af724 867 if (!(ch->flags & XPC_C_WDISCONNECT)) {
89eb8eb9 868 xpc_part_deref(part);
e54af724 869 continue;
89eb8eb9 870 }
e54af724 871
f9e505a9 872 wait_for_completion(&ch->wdisconnect_wait);
e54af724
DN
873
874 spin_lock_irqsave(&ch->lock, irq_flags);
875 DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));
876 wakeup_channel_mgr = 0;
877
7fb5e59d 878 if (ch->delayed_chctl_flags) {
83469b55 879 if (part->act_state != XPC_P_AS_DEACTIVATING) {
7fb5e59d
DN
880 spin_lock(&part->chctl_lock);
881 part->chctl.flags[ch->number] |=
882 ch->delayed_chctl_flags;
883 spin_unlock(&part->chctl_lock);
e54af724
DN
884 wakeup_channel_mgr = 1;
885 }
7fb5e59d 886 ch->delayed_chctl_flags = 0;
89eb8eb9 887 }
e54af724
DN
888
889 ch->flags &= ~XPC_C_WDISCONNECT;
890 spin_unlock_irqrestore(&ch->lock, irq_flags);
891
2c2b94f9 892 if (wakeup_channel_mgr)
e54af724 893 xpc_wakeup_channel_mgr(part);
e54af724
DN
894
895 xpc_part_deref(part);
89eb8eb9
DN
896 }
897}
898
5b8669df
DN
899static int
900xpc_setup_partitions(void)
901{
902 short partid;
903 struct xpc_partition *part;
904
905 xpc_partitions = kzalloc(sizeof(struct xpc_partition) *
906 xp_max_npartitions, GFP_KERNEL);
907 if (xpc_partitions == NULL) {
908 dev_err(xpc_part, "can't get memory for partition structure\n");
909 return -ENOMEM;
910 }
911
912 /*
913 * The first few fields of each entry of xpc_partitions[] need to
914 * be initialized now so that calls to xpc_connect() and
915 * xpc_disconnect() can be made prior to the activation of any remote
916 * partition. NOTE THAT NONE OF THE OTHER FIELDS BELONGING TO THESE
917 * ENTRIES ARE MEANINGFUL UNTIL AFTER AN ENTRY'S CORRESPONDING
918 * PARTITION HAS BEEN ACTIVATED.
919 */
920 for (partid = 0; partid < xp_max_npartitions; partid++) {
921 part = &xpc_partitions[partid];
922
923 DBUG_ON((u64)part != L1_CACHE_ALIGN((u64)part));
924
925 part->activate_IRQ_rcvd = 0;
926 spin_lock_init(&part->act_lock);
927 part->act_state = XPC_P_AS_INACTIVE;
928 XPC_SET_REASON(part, 0, 0);
929
930 init_timer(&part->disengage_timer);
931 part->disengage_timer.function =
932 xpc_timeout_partition_disengage;
933 part->disengage_timer.data = (unsigned long)part;
934
935 part->setup_state = XPC_P_SS_UNSET;
936 init_waitqueue_head(&part->teardown_wq);
937 atomic_set(&part->references, 0);
938 }
939
a7665b0a 940 return xpc_arch_ops.setup_partitions();
5b8669df
DN
941}
942
943static void
944xpc_teardown_partitions(void)
945{
a7665b0a 946 xpc_arch_ops.teardown_partitions();
5b8669df
DN
947 kfree(xpc_partitions);
948}
949
89eb8eb9 950static void
65c17b80 951xpc_do_exit(enum xp_retval reason)
89eb8eb9 952{
64d032ba 953 short partid;
1ecaded8 954 int active_part_count, printed_waiting_msg = 0;
89eb8eb9 955 struct xpc_partition *part;
a47d5dac 956 unsigned long printmsg_time, disengage_timeout = 0;
89eb8eb9 957
a607c389
DN
958 /* a 'rmmod XPC' and a 'reboot' cannot both end up here together */
959 DBUG_ON(xpc_exiting == 1);
89eb8eb9
DN
960
961 /*
a607c389
DN
962 * Let the heartbeat checker thread and the discovery thread
963 * (if one is running) know that they should exit. Also wake up
964 * the heartbeat checker thread in case it's sleeping.
89eb8eb9
DN
965 */
966 xpc_exiting = 1;
6e41017a 967 wake_up_interruptible(&xpc_activate_IRQ_wq);
89eb8eb9 968
e54af724 969 /* wait for the discovery thread to exit */
f9e505a9 970 wait_for_completion(&xpc_discovery_exited);
89eb8eb9 971
e54af724 972 /* wait for the heartbeat checker thread to exit */
f9e505a9 973 wait_for_completion(&xpc_hb_checker_exited);
89eb8eb9 974
a607c389 975 /* sleep for a 1/3 of a second or so */
35190506 976 (void)msleep_interruptible(300);
89eb8eb9
DN
977
978 /* wait for all partitions to become inactive */
979
a47d5dac
DN
980 printmsg_time = jiffies + (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ);
981 xpc_disengage_timedout = 0;
a607c389 982
89eb8eb9
DN
983 do {
984 active_part_count = 0;
985
bc63d387 986 for (partid = 0; partid < xp_max_npartitions; partid++) {
89eb8eb9 987 part = &xpc_partitions[partid];
89eb8eb9 988
a607c389 989 if (xpc_partition_disengaged(part) &&
83469b55 990 part->act_state == XPC_P_AS_INACTIVE) {
a607c389 991 continue;
89eb8eb9 992 }
a607c389
DN
993
994 active_part_count++;
995
996 XPC_DEACTIVATE_PARTITION(part, reason);
89eb8eb9 997
a47d5dac
DN
998 if (part->disengage_timeout > disengage_timeout)
999 disengage_timeout = part->disengage_timeout;
a607c389 1000 }
89eb8eb9 1001
a7665b0a 1002 if (xpc_arch_ops.any_partition_engaged()) {
aaa3cd69 1003 if (time_is_before_jiffies(printmsg_time)) {
1ecaded8 1004 dev_info(xpc_part, "waiting for remote "
a47d5dac
DN
1005 "partitions to deactivate, timeout in "
1006 "%ld seconds\n", (disengage_timeout -
1007 jiffies) / HZ);
1ecaded8 1008 printmsg_time = jiffies +
a47d5dac 1009 (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ);
1ecaded8
DN
1010 printed_waiting_msg = 1;
1011 }
1012
1013 } else if (active_part_count > 0) {
1014 if (printed_waiting_msg) {
1015 dev_info(xpc_part, "waiting for local partition"
a47d5dac 1016 " to deactivate\n");
1ecaded8
DN
1017 printed_waiting_msg = 0;
1018 }
1019
1020 } else {
a47d5dac 1021 if (!xpc_disengage_timedout) {
1ecaded8 1022 dev_info(xpc_part, "all partitions have "
a47d5dac 1023 "deactivated\n");
1ecaded8
DN
1024 }
1025 break;
89eb8eb9
DN
1026 }
1027
a607c389 1028 /* sleep for a 1/3 of a second or so */
35190506 1029 (void)msleep_interruptible(300);
a607c389
DN
1030
1031 } while (1);
1032
a7665b0a 1033 DBUG_ON(xpc_arch_ops.any_partition_engaged());
a607c389 1034
5b8669df 1035 xpc_teardown_rsvd_page();
a607c389 1036
65c17b80 1037 if (reason == xpUnloading) {
35190506 1038 (void)unregister_die_notifier(&xpc_die_notifier);
bc63d387 1039 (void)unregister_reboot_notifier(&xpc_reboot_notifier);
0752c670 1040 }
780d09e8 1041
89eb8eb9
DN
1042 /* clear the interface to XPC's functions */
1043 xpc_clear_interface();
1044
2c2b94f9 1045 if (xpc_sysctl)
89eb8eb9 1046 unregister_sysctl_table(xpc_sysctl);
7682a4c6 1047
5b8669df 1048 xpc_teardown_partitions();
6e41017a
DN
1049
1050 if (is_shub())
1051 xpc_exit_sn2();
b7f7b074 1052 else if (is_uv())
6e41017a 1053 xpc_exit_uv();
89eb8eb9
DN
1054}
1055
780d09e8 1056/*
d6ad033a
DN
1057 * This function is called when the system is being rebooted.
1058 */
1059static int
1060xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused)
1061{
65c17b80 1062 enum xp_retval reason;
d6ad033a 1063
d6ad033a
DN
1064 switch (event) {
1065 case SYS_RESTART:
65c17b80 1066 reason = xpSystemReboot;
d6ad033a
DN
1067 break;
1068 case SYS_HALT:
65c17b80 1069 reason = xpSystemHalt;
d6ad033a
DN
1070 break;
1071 case SYS_POWER_OFF:
65c17b80 1072 reason = xpSystemPoweroff;
d6ad033a
DN
1073 break;
1074 default:
65c17b80 1075 reason = xpSystemGoingDown;
d6ad033a
DN
1076 }
1077
1078 xpc_do_exit(reason);
1079 return NOTIFY_DONE;
1080}
1081
d6ad033a 1082/*
a47d5dac
DN
1083 * Notify other partitions to deactivate from us by first disengaging from all
1084 * references to our memory.
780d09e8
DN
1085 */
1086static void
a47d5dac 1087xpc_die_deactivate(void)
780d09e8
DN
1088{
1089 struct xpc_partition *part;
64d032ba 1090 short partid;
a47d5dac 1091 int any_engaged;
261f3b49
DN
1092 long keep_waiting;
1093 long wait_to_print;
780d09e8 1094
780d09e8
DN
1095 /* keep xpc_hb_checker thread from doing anything (just in case) */
1096 xpc_exiting = 1;
1097
a7665b0a 1098 xpc_arch_ops.disallow_all_hbs(); /*indicate we're deactivated */
780d09e8 1099
bc63d387 1100 for (partid = 0; partid < xp_max_npartitions; partid++) {
780d09e8
DN
1101 part = &xpc_partitions[partid];
1102
a7665b0a 1103 if (xpc_arch_ops.partition_engaged(partid) ||
83469b55 1104 part->act_state != XPC_P_AS_INACTIVE) {
a7665b0a
RH
1105 xpc_arch_ops.request_partition_deactivation(part);
1106 xpc_arch_ops.indicate_partition_disengaged(part);
780d09e8
DN
1107 }
1108 }
1109
a47d5dac
DN
1110 /*
1111 * Though we requested that all other partitions deactivate from us,
261f3b49
DN
1112 * we only wait until they've all disengaged or we've reached the
1113 * defined timelimit.
1114 *
1115 * Given that one iteration through the following while-loop takes
1116 * approximately 200 microseconds, calculate the #of loops to take
1117 * before bailing and the #of loops before printing a waiting message.
a47d5dac 1118 */
261f3b49
DN
1119 keep_waiting = xpc_disengage_timelimit * 1000 * 5;
1120 wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * 1000 * 5;
780d09e8 1121
1ecaded8 1122 while (1) {
a7665b0a 1123 any_engaged = xpc_arch_ops.any_partition_engaged();
a47d5dac
DN
1124 if (!any_engaged) {
1125 dev_info(xpc_part, "all partitions have deactivated\n");
1ecaded8
DN
1126 break;
1127 }
780d09e8 1128
261f3b49 1129 if (!keep_waiting--) {
bc63d387
DN
1130 for (partid = 0; partid < xp_max_npartitions;
1131 partid++) {
a7665b0a 1132 if (xpc_arch_ops.partition_engaged(partid)) {
a47d5dac 1133 dev_info(xpc_part, "deactivate from "
35190506
DN
1134 "remote partition %d timed "
1135 "out\n", partid);
1ecaded8
DN
1136 }
1137 }
1138 break;
1139 }
1140
261f3b49 1141 if (!wait_to_print--) {
780d09e8 1142 dev_info(xpc_part, "waiting for remote partitions to "
a47d5dac 1143 "deactivate, timeout in %ld seconds\n",
261f3b49
DN
1144 keep_waiting / (1000 * 5));
1145 wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL *
1146 1000 * 5;
780d09e8 1147 }
261f3b49
DN
1148
1149 udelay(200);
780d09e8 1150 }
780d09e8
DN
1151}
1152
780d09e8 1153/*
1f4674b2
DN
1154 * This function is called when the system is being restarted or halted due
1155 * to some sort of system failure. If this is the case we need to notify the
1156 * other partitions to disengage from all references to our memory.
1157 * This function can also be called when our heartbeater could be offlined
1158 * for a time. In this case we need to notify other partitions to not worry
1159 * about the lack of a heartbeat.
780d09e8
DN
1160 */
1161static int
1162xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused)
1163{
261f3b49 1164#ifdef CONFIG_IA64 /* !!! temporary kludge */
780d09e8
DN
1165 switch (event) {
1166 case DIE_MACHINE_RESTART:
1167 case DIE_MACHINE_HALT:
a47d5dac 1168 xpc_die_deactivate();
780d09e8 1169 break;
1f4674b2
DN
1170
1171 case DIE_KDEBUG_ENTER:
1172 /* Should lack of heartbeat be ignored by other partitions? */
2c2b94f9 1173 if (!xpc_kdebug_ignore)
1f4674b2 1174 break;
2c2b94f9 1175
1f4674b2 1176 /* fall through */
780d09e8
DN
1177 case DIE_MCA_MONARCH_ENTER:
1178 case DIE_INIT_MONARCH_ENTER:
a7665b0a 1179 xpc_arch_ops.offline_heartbeat();
780d09e8 1180 break;
1f4674b2
DN
1181
1182 case DIE_KDEBUG_LEAVE:
1183 /* Is lack of heartbeat being ignored by other partitions? */
2c2b94f9 1184 if (!xpc_kdebug_ignore)
1f4674b2 1185 break;
2c2b94f9 1186
1f4674b2 1187 /* fall through */
780d09e8
DN
1188 case DIE_MCA_MONARCH_LEAVE:
1189 case DIE_INIT_MONARCH_LEAVE:
a7665b0a 1190 xpc_arch_ops.online_heartbeat();
780d09e8
DN
1191 break;
1192 }
261f3b49
DN
1193#else
1194 xpc_die_deactivate();
1195#endif
780d09e8
DN
1196
1197 return NOTIFY_DONE;
1198}
1199
89eb8eb9
DN
1200int __init
1201xpc_init(void)
1202{
1203 int ret;
2c2b94f9 1204 struct task_struct *kthread;
ee6665e3 1205
bb0dc43e
KS
1206 dev_set_name(xpc_part, "part");
1207 dev_set_name(xpc_chan, "chan");
89eb8eb9 1208
94bd2708
DN
1209 if (is_shub()) {
1210 /*
1211 * The ia64-sn2 architecture supports at most 64 partitions.
c39838ce 1212 * And the inability to unregister remote amos restricts us
94bd2708
DN
1213 * further to only support exactly 64 partitions on this
1214 * architecture, no less.
1215 */
5b8669df
DN
1216 if (xp_max_npartitions != 64) {
1217 dev_err(xpc_part, "max #of partitions not set to 64\n");
1218 ret = -EINVAL;
1219 } else {
1220 ret = xpc_init_sn2();
1221 }
94bd2708
DN
1222
1223 } else if (is_uv()) {
5b8669df 1224 ret = xpc_init_uv();
94bd2708
DN
1225
1226 } else {
5b8669df 1227 ret = -ENODEV;
94bd2708 1228 }
408865ce 1229
5b8669df
DN
1230 if (ret != 0)
1231 return ret;
1232
1233 ret = xpc_setup_partitions();
1234 if (ret != 0) {
bc63d387 1235 dev_err(xpc_part, "can't get memory for partition structure\n");
ee6665e3 1236 goto out_1;
bc63d387 1237 }
89eb8eb9 1238
bc63d387
DN
1239 xpc_sysctl = register_sysctl_table(xpc_sys_dir);
1240
89eb8eb9
DN
1241 /*
1242 * Fill the partition reserved page with the information needed by
1243 * other partitions to discover we are alive and establish initial
1244 * communications.
1245 */
5b8669df
DN
1246 ret = xpc_setup_rsvd_page();
1247 if (ret != 0) {
bc63d387 1248 dev_err(xpc_part, "can't setup our reserved page\n");
ee6665e3 1249 goto out_2;
89eb8eb9
DN
1250 }
1251
a607c389
DN
1252 /* add ourselves to the reboot_notifier_list */
1253 ret = register_reboot_notifier(&xpc_reboot_notifier);
2c2b94f9 1254 if (ret != 0)
a607c389 1255 dev_warn(xpc_part, "can't register reboot notifier\n");
a607c389 1256
1eeb66a1 1257 /* add ourselves to the die_notifier list */
780d09e8 1258 ret = register_die_notifier(&xpc_die_notifier);
2c2b94f9 1259 if (ret != 0)
780d09e8 1260 dev_warn(xpc_part, "can't register die notifier\n");
780d09e8 1261
89eb8eb9
DN
1262 /*
1263 * The real work-horse behind xpc. This processes incoming
1264 * interrupts and monitors remote heartbeats.
1265 */
2c2b94f9
DN
1266 kthread = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME);
1267 if (IS_ERR(kthread)) {
89eb8eb9 1268 dev_err(xpc_part, "failed while forking hb check thread\n");
bc63d387 1269 ret = -EBUSY;
ee6665e3 1270 goto out_3;
89eb8eb9
DN
1271 }
1272
89eb8eb9
DN
1273 /*
1274 * Startup a thread that will attempt to discover other partitions to
1275 * activate based on info provided by SAL. This new thread is short
1276 * lived and will exit once discovery is complete.
1277 */
2c2b94f9
DN
1278 kthread = kthread_run(xpc_initiate_discovery, NULL,
1279 XPC_DISCOVERY_THREAD_NAME);
1280 if (IS_ERR(kthread)) {
89eb8eb9
DN
1281 dev_err(xpc_part, "failed while forking discovery thread\n");
1282
1283 /* mark this new thread as a non-starter */
f9e505a9 1284 complete(&xpc_discovery_exited);
89eb8eb9 1285
65c17b80 1286 xpc_do_exit(xpUnloading);
89eb8eb9
DN
1287 return -EBUSY;
1288 }
1289
89eb8eb9
DN
1290 /* set the interface to point at XPC's functions */
1291 xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect,
97bf1aa1
DN
1292 xpc_initiate_send, xpc_initiate_send_notify,
1293 xpc_initiate_received, xpc_initiate_partid_to_nasids);
89eb8eb9
DN
1294
1295 return 0;
bc63d387
DN
1296
1297 /* initialization was not successful */
ee6665e3 1298out_3:
5b8669df 1299 xpc_teardown_rsvd_page();
94bd2708 1300
bc63d387
DN
1301 (void)unregister_die_notifier(&xpc_die_notifier);
1302 (void)unregister_reboot_notifier(&xpc_reboot_notifier);
ee6665e3 1303out_2:
bc63d387
DN
1304 if (xpc_sysctl)
1305 unregister_sysctl_table(xpc_sysctl);
5b8669df
DN
1306
1307 xpc_teardown_partitions();
6e41017a
DN
1308out_1:
1309 if (is_shub())
1310 xpc_exit_sn2();
b7f7b074 1311 else if (is_uv())
6e41017a 1312 xpc_exit_uv();
bc63d387 1313 return ret;
89eb8eb9 1314}
89eb8eb9 1315
35190506 1316module_init(xpc_init);
89eb8eb9
DN
1317
1318void __exit
1319xpc_exit(void)
1320{
65c17b80 1321 xpc_do_exit(xpUnloading);
89eb8eb9 1322}
89eb8eb9 1323
35190506 1324module_exit(xpc_exit);
89eb8eb9
DN
1325
1326MODULE_AUTHOR("Silicon Graphics, Inc.");
1327MODULE_DESCRIPTION("Cross Partition Communication (XPC) support");
1328MODULE_LICENSE("GPL");
1329
1330module_param(xpc_hb_interval, int, 0);
1331MODULE_PARM_DESC(xpc_hb_interval, "Number of seconds between "
35190506 1332 "heartbeat increments.");
89eb8eb9
DN
1333
1334module_param(xpc_hb_check_interval, int, 0);
1335MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between "
35190506 1336 "heartbeat checks.");
89eb8eb9 1337
a47d5dac
DN
1338module_param(xpc_disengage_timelimit, int, 0);
1339MODULE_PARM_DESC(xpc_disengage_timelimit, "Number of seconds to wait "
1340 "for disengage to complete.");
e54af724 1341
1f4674b2
DN
1342module_param(xpc_kdebug_ignore, int, 0);
1343MODULE_PARM_DESC(xpc_kdebug_ignore, "Should lack of heartbeat be ignored by "
35190506 1344 "other partitions when dropping into kdebug.");