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47#include <linux/module.h>
48#include <linux/slab.h>
49#include <linux/sysctl.h>
50#include <linux/device.h>
51#include <linux/delay.h>
52#include <linux/reboot.h>
53#include <linux/kdebug.h>
54#include <linux/kthread.h>
55#include "xpc.h"
56
57#ifdef CONFIG_X86_64
58#include <asm/traps.h>
59#endif
60
61
62
63static struct device_driver xpc_dbg_name = {
64 .name = "xpc"
65};
66
67static struct device xpc_part_dbg_subname = {
68 .init_name = "",
69 .driver = &xpc_dbg_name
70};
71
72static struct device xpc_chan_dbg_subname = {
73 .init_name = "",
74 .driver = &xpc_dbg_name
75};
76
77struct device *xpc_part = &xpc_part_dbg_subname;
78struct device *xpc_chan = &xpc_chan_dbg_subname;
79
80static int xpc_kdebug_ignore;
81
82
83
84static int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL;
85static int xpc_hb_min_interval = 1;
86static int xpc_hb_max_interval = 10;
87
88static int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_INTERVAL;
89static int xpc_hb_check_min_interval = 10;
90static int xpc_hb_check_max_interval = 120;
91
92int xpc_disengage_timelimit = XPC_DISENGAGE_DEFAULT_TIMELIMIT;
93static int xpc_disengage_min_timelimit;
94static int xpc_disengage_max_timelimit = 120;
95
96static struct ctl_table xpc_sys_xpc_hb_dir[] = {
97 {
98 .procname = "hb_interval",
99 .data = &xpc_hb_interval,
100 .maxlen = sizeof(int),
101 .mode = 0644,
102 .proc_handler = proc_dointvec_minmax,
103 .extra1 = &xpc_hb_min_interval,
104 .extra2 = &xpc_hb_max_interval},
105 {
106 .procname = "hb_check_interval",
107 .data = &xpc_hb_check_interval,
108 .maxlen = sizeof(int),
109 .mode = 0644,
110 .proc_handler = proc_dointvec_minmax,
111 .extra1 = &xpc_hb_check_min_interval,
112 .extra2 = &xpc_hb_check_max_interval},
113 {}
114};
115static struct ctl_table xpc_sys_xpc_dir[] = {
116 {
117 .procname = "hb",
118 .mode = 0555,
119 .child = xpc_sys_xpc_hb_dir},
120 {
121 .procname = "disengage_timelimit",
122 .data = &xpc_disengage_timelimit,
123 .maxlen = sizeof(int),
124 .mode = 0644,
125 .proc_handler = proc_dointvec_minmax,
126 .extra1 = &xpc_disengage_min_timelimit,
127 .extra2 = &xpc_disengage_max_timelimit},
128 {}
129};
130static struct ctl_table xpc_sys_dir[] = {
131 {
132 .procname = "xpc",
133 .mode = 0555,
134 .child = xpc_sys_xpc_dir},
135 {}
136};
137static struct ctl_table_header *xpc_sysctl;
138
139
140int xpc_disengage_timedout;
141
142
143int xpc_activate_IRQ_rcvd;
144DEFINE_SPINLOCK(xpc_activate_IRQ_rcvd_lock);
145
146
147DECLARE_WAIT_QUEUE_HEAD(xpc_activate_IRQ_wq);
148
149static unsigned long xpc_hb_check_timeout;
150static struct timer_list xpc_hb_timer;
151
152
153static DECLARE_COMPLETION(xpc_hb_checker_exited);
154
155
156static DECLARE_COMPLETION(xpc_discovery_exited);
157
158static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *);
159
160static int xpc_system_reboot(struct notifier_block *, unsigned long, void *);
161static struct notifier_block xpc_reboot_notifier = {
162 .notifier_call = xpc_system_reboot,
163};
164
165static int xpc_system_die(struct notifier_block *, unsigned long, void *);
166static struct notifier_block xpc_die_notifier = {
167 .notifier_call = xpc_system_die,
168};
169
170struct xpc_arch_operations xpc_arch_ops;
171
172
173
174
175static void
176xpc_timeout_partition_disengage(struct timer_list *t)
177{
178 struct xpc_partition *part = from_timer(part, t, disengage_timer);
179
180 DBUG_ON(time_is_after_jiffies(part->disengage_timeout));
181
182 xpc_partition_disengaged_from_timer(part);
183
184 DBUG_ON(part->disengage_timeout != 0);
185 DBUG_ON(xpc_arch_ops.partition_engaged(XPC_PARTID(part)));
186}
187
188
189
190
191
192
193static void
194xpc_hb_beater(struct timer_list *unused)
195{
196 xpc_arch_ops.increment_heartbeat();
197
198 if (time_is_before_eq_jiffies(xpc_hb_check_timeout))
199 wake_up_interruptible(&xpc_activate_IRQ_wq);
200
201 xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ);
202 add_timer(&xpc_hb_timer);
203}
204
205static void
206xpc_start_hb_beater(void)
207{
208 xpc_arch_ops.heartbeat_init();
209 timer_setup(&xpc_hb_timer, xpc_hb_beater, 0);
210 xpc_hb_beater(NULL);
211}
212
213static void
214xpc_stop_hb_beater(void)
215{
216 del_timer_sync(&xpc_hb_timer);
217 xpc_arch_ops.heartbeat_exit();
218}
219
220
221
222
223
224static void
225xpc_check_remote_hb(void)
226{
227 struct xpc_partition *part;
228 short partid;
229 enum xp_retval ret;
230
231 for (partid = 0; partid < xp_max_npartitions; partid++) {
232
233 if (xpc_exiting)
234 break;
235
236 if (partid == xp_partition_id)
237 continue;
238
239 part = &xpc_partitions[partid];
240
241 if (part->act_state == XPC_P_AS_INACTIVE ||
242 part->act_state == XPC_P_AS_DEACTIVATING) {
243 continue;
244 }
245
246 ret = xpc_arch_ops.get_remote_heartbeat(part);
247 if (ret != xpSuccess)
248 XPC_DEACTIVATE_PARTITION(part, ret);
249 }
250}
251
252
253
254
255
256static int
257xpc_hb_checker(void *ignore)
258{
259 int force_IRQ = 0;
260
261
262
263 set_cpus_allowed_ptr(current, cpumask_of(XPC_HB_CHECK_CPU));
264
265
266 xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ);
267 xpc_start_hb_beater();
268
269 while (!xpc_exiting) {
270
271 dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have "
272 "been received\n",
273 (int)(xpc_hb_check_timeout - jiffies),
274 xpc_activate_IRQ_rcvd);
275
276
277 if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) {
278 xpc_hb_check_timeout = jiffies +
279 (xpc_hb_check_interval * HZ);
280
281 dev_dbg(xpc_part, "checking remote heartbeats\n");
282 xpc_check_remote_hb();
283 }
284
285
286 if (xpc_activate_IRQ_rcvd > 0 || force_IRQ != 0) {
287 force_IRQ = 0;
288 dev_dbg(xpc_part, "processing activate IRQs "
289 "received\n");
290 xpc_arch_ops.process_activate_IRQ_rcvd();
291 }
292
293
294 (void)wait_event_interruptible(xpc_activate_IRQ_wq,
295 (time_is_before_eq_jiffies(
296 xpc_hb_check_timeout) ||
297 xpc_activate_IRQ_rcvd > 0 ||
298 xpc_exiting));
299 }
300
301 xpc_stop_hb_beater();
302
303 dev_dbg(xpc_part, "heartbeat checker is exiting\n");
304
305
306 complete(&xpc_hb_checker_exited);
307 return 0;
308}
309
310
311
312
313
314
315static int
316xpc_initiate_discovery(void *ignore)
317{
318 xpc_discovery();
319
320 dev_dbg(xpc_part, "discovery thread is exiting\n");
321
322
323 complete(&xpc_discovery_exited);
324 return 0;
325}
326
327
328
329
330
331
332
333
334
335
336
337
338
339static void
340xpc_channel_mgr(struct xpc_partition *part)
341{
342 while (part->act_state != XPC_P_AS_DEACTIVATING ||
343 atomic_read(&part->nchannels_active) > 0 ||
344 !xpc_partition_disengaged(part)) {
345
346 xpc_process_sent_chctl_flags(part);
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361 atomic_dec(&part->channel_mgr_requests);
362 (void)wait_event_interruptible(part->channel_mgr_wq,
363 (atomic_read(&part->channel_mgr_requests) > 0 ||
364 part->chctl.all_flags != 0 ||
365 (part->act_state == XPC_P_AS_DEACTIVATING &&
366 atomic_read(&part->nchannels_active) == 0 &&
367 xpc_partition_disengaged(part))));
368 atomic_set(&part->channel_mgr_requests, 1);
369 }
370}
371
372
373
374
375void *
376xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
377{
378
379 *base = kzalloc(size, flags);
380 if (*base == NULL)
381 return NULL;
382
383 if ((u64)*base == L1_CACHE_ALIGN((u64)*base))
384 return *base;
385
386 kfree(*base);
387
388
389 *base = kzalloc(size + L1_CACHE_BYTES, flags);
390 if (*base == NULL)
391 return NULL;
392
393 return (void *)L1_CACHE_ALIGN((u64)*base);
394}
395
396
397
398
399
400static enum xp_retval
401xpc_setup_ch_structures(struct xpc_partition *part)
402{
403 enum xp_retval ret;
404 int ch_number;
405 struct xpc_channel *ch;
406 short partid = XPC_PARTID(part);
407
408
409
410
411
412 DBUG_ON(part->channels != NULL);
413 part->channels = kcalloc(XPC_MAX_NCHANNELS,
414 sizeof(struct xpc_channel),
415 GFP_KERNEL);
416 if (part->channels == NULL) {
417 dev_err(xpc_chan, "can't get memory for channels\n");
418 return xpNoMemory;
419 }
420
421
422
423 part->remote_openclose_args =
424 xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE,
425 GFP_KERNEL, &part->
426 remote_openclose_args_base);
427 if (part->remote_openclose_args == NULL) {
428 dev_err(xpc_chan, "can't get memory for remote connect args\n");
429 ret = xpNoMemory;
430 goto out_1;
431 }
432
433 part->chctl.all_flags = 0;
434 spin_lock_init(&part->chctl_lock);
435
436 atomic_set(&part->channel_mgr_requests, 1);
437 init_waitqueue_head(&part->channel_mgr_wq);
438
439 part->nchannels = XPC_MAX_NCHANNELS;
440
441 atomic_set(&part->nchannels_active, 0);
442 atomic_set(&part->nchannels_engaged, 0);
443
444 for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
445 ch = &part->channels[ch_number];
446
447 ch->partid = partid;
448 ch->number = ch_number;
449 ch->flags = XPC_C_DISCONNECTED;
450
451 atomic_set(&ch->kthreads_assigned, 0);
452 atomic_set(&ch->kthreads_idle, 0);
453 atomic_set(&ch->kthreads_active, 0);
454
455 atomic_set(&ch->references, 0);
456 atomic_set(&ch->n_to_notify, 0);
457
458 spin_lock_init(&ch->lock);
459 init_completion(&ch->wdisconnect_wait);
460
461 atomic_set(&ch->n_on_msg_allocate_wq, 0);
462 init_waitqueue_head(&ch->msg_allocate_wq);
463 init_waitqueue_head(&ch->idle_wq);
464 }
465
466 ret = xpc_arch_ops.setup_ch_structures(part);
467 if (ret != xpSuccess)
468 goto out_2;
469
470
471
472
473
474 part->setup_state = XPC_P_SS_SETUP;
475
476 return xpSuccess;
477
478
479out_2:
480 kfree(part->remote_openclose_args_base);
481 part->remote_openclose_args = NULL;
482out_1:
483 kfree(part->channels);
484 part->channels = NULL;
485 return ret;
486}
487
488
489
490
491
492static void
493xpc_teardown_ch_structures(struct xpc_partition *part)
494{
495 DBUG_ON(atomic_read(&part->nchannels_engaged) != 0);
496 DBUG_ON(atomic_read(&part->nchannels_active) != 0);
497
498
499
500
501
502
503 DBUG_ON(part->setup_state != XPC_P_SS_SETUP);
504 part->setup_state = XPC_P_SS_WTEARDOWN;
505
506 wait_event(part->teardown_wq, (atomic_read(&part->references) == 0));
507
508
509
510 xpc_arch_ops.teardown_ch_structures(part);
511
512 kfree(part->remote_openclose_args_base);
513 part->remote_openclose_args = NULL;
514 kfree(part->channels);
515 part->channels = NULL;
516
517 part->setup_state = XPC_P_SS_TORNDOWN;
518}
519
520
521
522
523
524
525
526
527
528
529
530
531static int
532xpc_activating(void *__partid)
533{
534 short partid = (u64)__partid;
535 struct xpc_partition *part = &xpc_partitions[partid];
536 unsigned long irq_flags;
537
538 DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
539
540 spin_lock_irqsave(&part->act_lock, irq_flags);
541
542 if (part->act_state == XPC_P_AS_DEACTIVATING) {
543 part->act_state = XPC_P_AS_INACTIVE;
544 spin_unlock_irqrestore(&part->act_lock, irq_flags);
545 part->remote_rp_pa = 0;
546 return 0;
547 }
548
549
550 DBUG_ON(part->act_state != XPC_P_AS_ACTIVATION_REQ);
551 part->act_state = XPC_P_AS_ACTIVATING;
552
553 XPC_SET_REASON(part, 0, 0);
554 spin_unlock_irqrestore(&part->act_lock, irq_flags);
555
556 dev_dbg(xpc_part, "activating partition %d\n", partid);
557
558 xpc_arch_ops.allow_hb(partid);
559
560 if (xpc_setup_ch_structures(part) == xpSuccess) {
561 (void)xpc_part_ref(part);
562
563 if (xpc_arch_ops.make_first_contact(part) == xpSuccess) {
564 xpc_mark_partition_active(part);
565 xpc_channel_mgr(part);
566
567 }
568
569 xpc_part_deref(part);
570 xpc_teardown_ch_structures(part);
571 }
572
573 xpc_arch_ops.disallow_hb(partid);
574 xpc_mark_partition_inactive(part);
575
576 if (part->reason == xpReactivating) {
577
578 xpc_arch_ops.request_partition_reactivation(part);
579 }
580
581 return 0;
582}
583
584void
585xpc_activate_partition(struct xpc_partition *part)
586{
587 short partid = XPC_PARTID(part);
588 unsigned long irq_flags;
589 struct task_struct *kthread;
590
591 spin_lock_irqsave(&part->act_lock, irq_flags);
592
593 DBUG_ON(part->act_state != XPC_P_AS_INACTIVE);
594
595 part->act_state = XPC_P_AS_ACTIVATION_REQ;
596 XPC_SET_REASON(part, xpCloneKThread, __LINE__);
597
598 spin_unlock_irqrestore(&part->act_lock, irq_flags);
599
600 kthread = kthread_run(xpc_activating, (void *)((u64)partid), "xpc%02d",
601 partid);
602 if (IS_ERR(kthread)) {
603 spin_lock_irqsave(&part->act_lock, irq_flags);
604 part->act_state = XPC_P_AS_INACTIVE;
605 XPC_SET_REASON(part, xpCloneKThreadFailed, __LINE__);
606 spin_unlock_irqrestore(&part->act_lock, irq_flags);
607 }
608}
609
610void
611xpc_activate_kthreads(struct xpc_channel *ch, int needed)
612{
613 int idle = atomic_read(&ch->kthreads_idle);
614 int assigned = atomic_read(&ch->kthreads_assigned);
615 int wakeup;
616
617 DBUG_ON(needed <= 0);
618
619 if (idle > 0) {
620 wakeup = (needed > idle) ? idle : needed;
621 needed -= wakeup;
622
623 dev_dbg(xpc_chan, "wakeup %d idle kthreads, partid=%d, "
624 "channel=%d\n", wakeup, ch->partid, ch->number);
625
626
627 wake_up_nr(&ch->idle_wq, wakeup);
628 }
629
630 if (needed <= 0)
631 return;
632
633 if (needed + assigned > ch->kthreads_assigned_limit) {
634 needed = ch->kthreads_assigned_limit - assigned;
635 if (needed <= 0)
636 return;
637 }
638
639 dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n",
640 needed, ch->partid, ch->number);
641
642 xpc_create_kthreads(ch, needed, 0);
643}
644
645
646
647
648static void
649xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch)
650{
651 int (*n_of_deliverable_payloads) (struct xpc_channel *) =
652 xpc_arch_ops.n_of_deliverable_payloads;
653
654 do {
655
656
657 while (n_of_deliverable_payloads(ch) > 0 &&
658 !(ch->flags & XPC_C_DISCONNECTING)) {
659 xpc_deliver_payload(ch);
660 }
661
662 if (atomic_inc_return(&ch->kthreads_idle) >
663 ch->kthreads_idle_limit) {
664
665 atomic_dec(&ch->kthreads_idle);
666 break;
667 }
668
669 dev_dbg(xpc_chan, "idle kthread calling "
670 "wait_event_interruptible_exclusive()\n");
671
672 (void)wait_event_interruptible_exclusive(ch->idle_wq,
673 (n_of_deliverable_payloads(ch) > 0 ||
674 (ch->flags & XPC_C_DISCONNECTING)));
675
676 atomic_dec(&ch->kthreads_idle);
677
678 } while (!(ch->flags & XPC_C_DISCONNECTING));
679}
680
681static int
682xpc_kthread_start(void *args)
683{
684 short partid = XPC_UNPACK_ARG1(args);
685 u16 ch_number = XPC_UNPACK_ARG2(args);
686 struct xpc_partition *part = &xpc_partitions[partid];
687 struct xpc_channel *ch;
688 int n_needed;
689 unsigned long irq_flags;
690 int (*n_of_deliverable_payloads) (struct xpc_channel *) =
691 xpc_arch_ops.n_of_deliverable_payloads;
692
693 dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n",
694 partid, ch_number);
695
696 ch = &part->channels[ch_number];
697
698 if (!(ch->flags & XPC_C_DISCONNECTING)) {
699
700
701
702 spin_lock_irqsave(&ch->lock, irq_flags);
703 if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) {
704 ch->flags |= XPC_C_CONNECTEDCALLOUT;
705 spin_unlock_irqrestore(&ch->lock, irq_flags);
706
707 xpc_connected_callout(ch);
708
709 spin_lock_irqsave(&ch->lock, irq_flags);
710 ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE;
711 spin_unlock_irqrestore(&ch->lock, irq_flags);
712
713
714
715
716
717
718
719
720 n_needed = n_of_deliverable_payloads(ch) - 1;
721 if (n_needed > 0 && !(ch->flags & XPC_C_DISCONNECTING))
722 xpc_activate_kthreads(ch, n_needed);
723
724 } else {
725 spin_unlock_irqrestore(&ch->lock, irq_flags);
726 }
727
728 xpc_kthread_waitmsgs(part, ch);
729 }
730
731
732
733 spin_lock_irqsave(&ch->lock, irq_flags);
734 if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
735 !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
736 ch->flags |= XPC_C_DISCONNECTINGCALLOUT;
737 spin_unlock_irqrestore(&ch->lock, irq_flags);
738
739 xpc_disconnect_callout(ch, xpDisconnecting);
740
741 spin_lock_irqsave(&ch->lock, irq_flags);
742 ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE;
743 }
744 spin_unlock_irqrestore(&ch->lock, irq_flags);
745
746 if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
747 atomic_dec_return(&part->nchannels_engaged) == 0) {
748 xpc_arch_ops.indicate_partition_disengaged(part);
749 }
750
751 xpc_msgqueue_deref(ch);
752
753 dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n",
754 partid, ch_number);
755
756 xpc_part_deref(part);
757 return 0;
758}
759
760
761
762
763
764
765
766
767
768
769
770
771
772void
773xpc_create_kthreads(struct xpc_channel *ch, int needed,
774 int ignore_disconnecting)
775{
776 unsigned long irq_flags;
777 u64 args = XPC_PACK_ARGS(ch->partid, ch->number);
778 struct xpc_partition *part = &xpc_partitions[ch->partid];
779 struct task_struct *kthread;
780 void (*indicate_partition_disengaged) (struct xpc_partition *) =
781 xpc_arch_ops.indicate_partition_disengaged;
782
783 while (needed-- > 0) {
784
785
786
787
788
789
790 if (ignore_disconnecting) {
791 if (!atomic_inc_not_zero(&ch->kthreads_assigned)) {
792
793 BUG_ON(!(ch->flags &
794 XPC_C_DISCONNECTINGCALLOUT_MADE));
795 break;
796 }
797
798 } else if (ch->flags & XPC_C_DISCONNECTING) {
799 break;
800
801 } else if (atomic_inc_return(&ch->kthreads_assigned) == 1 &&
802 atomic_inc_return(&part->nchannels_engaged) == 1) {
803 xpc_arch_ops.indicate_partition_engaged(part);
804 }
805 (void)xpc_part_ref(part);
806 xpc_msgqueue_ref(ch);
807
808 kthread = kthread_run(xpc_kthread_start, (void *)args,
809 "xpc%02dc%d", ch->partid, ch->number);
810 if (IS_ERR(kthread)) {
811
812
813
814
815
816
817
818
819
820
821
822
823 if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
824 atomic_dec_return(&part->nchannels_engaged) == 0) {
825 indicate_partition_disengaged(part);
826 }
827 xpc_msgqueue_deref(ch);
828 xpc_part_deref(part);
829
830 if (atomic_read(&ch->kthreads_assigned) <
831 ch->kthreads_idle_limit) {
832
833
834
835
836
837 spin_lock_irqsave(&ch->lock, irq_flags);
838 XPC_DISCONNECT_CHANNEL(ch, xpLackOfResources,
839 &irq_flags);
840 spin_unlock_irqrestore(&ch->lock, irq_flags);
841 }
842 break;
843 }
844 }
845}
846
847void
848xpc_disconnect_wait(int ch_number)
849{
850 unsigned long irq_flags;
851 short partid;
852 struct xpc_partition *part;
853 struct xpc_channel *ch;
854 int wakeup_channel_mgr;
855
856
857 for (partid = 0; partid < xp_max_npartitions; partid++) {
858 part = &xpc_partitions[partid];
859
860 if (!xpc_part_ref(part))
861 continue;
862
863 ch = &part->channels[ch_number];
864
865 if (!(ch->flags & XPC_C_WDISCONNECT)) {
866 xpc_part_deref(part);
867 continue;
868 }
869
870 wait_for_completion(&ch->wdisconnect_wait);
871
872 spin_lock_irqsave(&ch->lock, irq_flags);
873 DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));
874 wakeup_channel_mgr = 0;
875
876 if (ch->delayed_chctl_flags) {
877 if (part->act_state != XPC_P_AS_DEACTIVATING) {
878 spin_lock(&part->chctl_lock);
879 part->chctl.flags[ch->number] |=
880 ch->delayed_chctl_flags;
881 spin_unlock(&part->chctl_lock);
882 wakeup_channel_mgr = 1;
883 }
884 ch->delayed_chctl_flags = 0;
885 }
886
887 ch->flags &= ~XPC_C_WDISCONNECT;
888 spin_unlock_irqrestore(&ch->lock, irq_flags);
889
890 if (wakeup_channel_mgr)
891 xpc_wakeup_channel_mgr(part);
892
893 xpc_part_deref(part);
894 }
895}
896
897static int
898xpc_setup_partitions(void)
899{
900 short partid;
901 struct xpc_partition *part;
902
903 xpc_partitions = kcalloc(xp_max_npartitions,
904 sizeof(struct xpc_partition),
905 GFP_KERNEL);
906 if (xpc_partitions == NULL) {
907 dev_err(xpc_part, "can't get memory for partition structure\n");
908 return -ENOMEM;
909 }
910
911
912
913
914
915
916
917
918
919 for (partid = 0; partid < xp_max_npartitions; partid++) {
920 part = &xpc_partitions[partid];
921
922 DBUG_ON((u64)part != L1_CACHE_ALIGN((u64)part));
923
924 part->activate_IRQ_rcvd = 0;
925 spin_lock_init(&part->act_lock);
926 part->act_state = XPC_P_AS_INACTIVE;
927 XPC_SET_REASON(part, 0, 0);
928
929 timer_setup(&part->disengage_timer,
930 xpc_timeout_partition_disengage, 0);
931
932 part->setup_state = XPC_P_SS_UNSET;
933 init_waitqueue_head(&part->teardown_wq);
934 atomic_set(&part->references, 0);
935 }
936
937 return xpc_arch_ops.setup_partitions();
938}
939
940static void
941xpc_teardown_partitions(void)
942{
943 xpc_arch_ops.teardown_partitions();
944 kfree(xpc_partitions);
945}
946
947static void
948xpc_do_exit(enum xp_retval reason)
949{
950 short partid;
951 int active_part_count, printed_waiting_msg = 0;
952 struct xpc_partition *part;
953 unsigned long printmsg_time, disengage_timeout = 0;
954
955
956 DBUG_ON(xpc_exiting == 1);
957
958
959
960
961
962
963 xpc_exiting = 1;
964 wake_up_interruptible(&xpc_activate_IRQ_wq);
965
966
967 wait_for_completion(&xpc_discovery_exited);
968
969
970 wait_for_completion(&xpc_hb_checker_exited);
971
972
973 (void)msleep_interruptible(300);
974
975
976
977 printmsg_time = jiffies + (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ);
978 xpc_disengage_timedout = 0;
979
980 do {
981 active_part_count = 0;
982
983 for (partid = 0; partid < xp_max_npartitions; partid++) {
984 part = &xpc_partitions[partid];
985
986 if (xpc_partition_disengaged(part) &&
987 part->act_state == XPC_P_AS_INACTIVE) {
988 continue;
989 }
990
991 active_part_count++;
992
993 XPC_DEACTIVATE_PARTITION(part, reason);
994
995 if (part->disengage_timeout > disengage_timeout)
996 disengage_timeout = part->disengage_timeout;
997 }
998
999 if (xpc_arch_ops.any_partition_engaged()) {
1000 if (time_is_before_jiffies(printmsg_time)) {
1001 dev_info(xpc_part, "waiting for remote "
1002 "partitions to deactivate, timeout in "
1003 "%ld seconds\n", (disengage_timeout -
1004 jiffies) / HZ);
1005 printmsg_time = jiffies +
1006 (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ);
1007 printed_waiting_msg = 1;
1008 }
1009
1010 } else if (active_part_count > 0) {
1011 if (printed_waiting_msg) {
1012 dev_info(xpc_part, "waiting for local partition"
1013 " to deactivate\n");
1014 printed_waiting_msg = 0;
1015 }
1016
1017 } else {
1018 if (!xpc_disengage_timedout) {
1019 dev_info(xpc_part, "all partitions have "
1020 "deactivated\n");
1021 }
1022 break;
1023 }
1024
1025
1026 (void)msleep_interruptible(300);
1027
1028 } while (1);
1029
1030 DBUG_ON(xpc_arch_ops.any_partition_engaged());
1031
1032 xpc_teardown_rsvd_page();
1033
1034 if (reason == xpUnloading) {
1035 (void)unregister_die_notifier(&xpc_die_notifier);
1036 (void)unregister_reboot_notifier(&xpc_reboot_notifier);
1037 }
1038
1039
1040 xpc_clear_interface();
1041
1042 if (xpc_sysctl)
1043 unregister_sysctl_table(xpc_sysctl);
1044
1045 xpc_teardown_partitions();
1046
1047 if (is_uv_system())
1048 xpc_exit_uv();
1049}
1050
1051
1052
1053
1054static int
1055xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused)
1056{
1057 enum xp_retval reason;
1058
1059 switch (event) {
1060 case SYS_RESTART:
1061 reason = xpSystemReboot;
1062 break;
1063 case SYS_HALT:
1064 reason = xpSystemHalt;
1065 break;
1066 case SYS_POWER_OFF:
1067 reason = xpSystemPoweroff;
1068 break;
1069 default:
1070 reason = xpSystemGoingDown;
1071 }
1072
1073 xpc_do_exit(reason);
1074 return NOTIFY_DONE;
1075}
1076
1077
1078static unsigned int xpc_die_disconnecting;
1079
1080
1081
1082
1083
1084static void
1085xpc_die_deactivate(void)
1086{
1087 struct xpc_partition *part;
1088 short partid;
1089 int any_engaged;
1090 long keep_waiting;
1091 long wait_to_print;
1092
1093 if (cmpxchg(&xpc_die_disconnecting, 0, 1))
1094 return;
1095
1096
1097 xpc_exiting = 1;
1098
1099 xpc_arch_ops.disallow_all_hbs();
1100
1101 for (partid = 0; partid < xp_max_npartitions; partid++) {
1102 part = &xpc_partitions[partid];
1103
1104 if (xpc_arch_ops.partition_engaged(partid) ||
1105 part->act_state != XPC_P_AS_INACTIVE) {
1106 xpc_arch_ops.request_partition_deactivation(part);
1107 xpc_arch_ops.indicate_partition_disengaged(part);
1108 }
1109 }
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120 keep_waiting = xpc_disengage_timelimit * 1000 * 5;
1121 wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * 1000 * 5;
1122
1123 while (1) {
1124 any_engaged = xpc_arch_ops.any_partition_engaged();
1125 if (!any_engaged) {
1126 dev_info(xpc_part, "all partitions have deactivated\n");
1127 break;
1128 }
1129
1130 if (!keep_waiting--) {
1131 for (partid = 0; partid < xp_max_npartitions;
1132 partid++) {
1133 if (xpc_arch_ops.partition_engaged(partid)) {
1134 dev_info(xpc_part, "deactivate from "
1135 "remote partition %d timed "
1136 "out\n", partid);
1137 }
1138 }
1139 break;
1140 }
1141
1142 if (!wait_to_print--) {
1143 dev_info(xpc_part, "waiting for remote partitions to "
1144 "deactivate, timeout in %ld seconds\n",
1145 keep_waiting / (1000 * 5));
1146 wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL *
1147 1000 * 5;
1148 }
1149
1150 udelay(200);
1151 }
1152}
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162static int
1163xpc_system_die(struct notifier_block *nb, unsigned long event, void *_die_args)
1164{
1165#ifdef CONFIG_IA64
1166 switch (event) {
1167 case DIE_MACHINE_RESTART:
1168 case DIE_MACHINE_HALT:
1169 xpc_die_deactivate();
1170 break;
1171
1172 case DIE_KDEBUG_ENTER:
1173
1174 if (!xpc_kdebug_ignore)
1175 break;
1176
1177 fallthrough;
1178 case DIE_MCA_MONARCH_ENTER:
1179 case DIE_INIT_MONARCH_ENTER:
1180 xpc_arch_ops.offline_heartbeat();
1181 break;
1182
1183 case DIE_KDEBUG_LEAVE:
1184
1185 if (!xpc_kdebug_ignore)
1186 break;
1187
1188 fallthrough;
1189 case DIE_MCA_MONARCH_LEAVE:
1190 case DIE_INIT_MONARCH_LEAVE:
1191 xpc_arch_ops.online_heartbeat();
1192 break;
1193 }
1194#else
1195 struct die_args *die_args = _die_args;
1196
1197 switch (event) {
1198 case DIE_TRAP:
1199 if (die_args->trapnr == X86_TRAP_DF)
1200 xpc_die_deactivate();
1201
1202 if (((die_args->trapnr == X86_TRAP_MF) ||
1203 (die_args->trapnr == X86_TRAP_XF)) &&
1204 !user_mode(die_args->regs))
1205 xpc_die_deactivate();
1206
1207 break;
1208 case DIE_INT3:
1209 case DIE_DEBUG:
1210 break;
1211 case DIE_OOPS:
1212 case DIE_GPF:
1213 default:
1214 xpc_die_deactivate();
1215 }
1216#endif
1217
1218 return NOTIFY_DONE;
1219}
1220
1221static int __init
1222xpc_init(void)
1223{
1224 int ret;
1225 struct task_struct *kthread;
1226
1227 dev_set_name(xpc_part, "part");
1228 dev_set_name(xpc_chan, "chan");
1229
1230 if (is_uv_system()) {
1231 ret = xpc_init_uv();
1232
1233 } else {
1234 ret = -ENODEV;
1235 }
1236
1237 if (ret != 0)
1238 return ret;
1239
1240 ret = xpc_setup_partitions();
1241 if (ret != 0) {
1242 dev_err(xpc_part, "can't get memory for partition structure\n");
1243 goto out_1;
1244 }
1245
1246 xpc_sysctl = register_sysctl_table(xpc_sys_dir);
1247
1248
1249
1250
1251
1252
1253 ret = xpc_setup_rsvd_page();
1254 if (ret != 0) {
1255 dev_err(xpc_part, "can't setup our reserved page\n");
1256 goto out_2;
1257 }
1258
1259
1260 ret = register_reboot_notifier(&xpc_reboot_notifier);
1261 if (ret != 0)
1262 dev_warn(xpc_part, "can't register reboot notifier\n");
1263
1264
1265 ret = register_die_notifier(&xpc_die_notifier);
1266 if (ret != 0)
1267 dev_warn(xpc_part, "can't register die notifier\n");
1268
1269
1270
1271
1272
1273 kthread = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME);
1274 if (IS_ERR(kthread)) {
1275 dev_err(xpc_part, "failed while forking hb check thread\n");
1276 ret = -EBUSY;
1277 goto out_3;
1278 }
1279
1280
1281
1282
1283
1284
1285 kthread = kthread_run(xpc_initiate_discovery, NULL,
1286 XPC_DISCOVERY_THREAD_NAME);
1287 if (IS_ERR(kthread)) {
1288 dev_err(xpc_part, "failed while forking discovery thread\n");
1289
1290
1291 complete(&xpc_discovery_exited);
1292
1293 xpc_do_exit(xpUnloading);
1294 return -EBUSY;
1295 }
1296
1297
1298 xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect,
1299 xpc_initiate_send, xpc_initiate_send_notify,
1300 xpc_initiate_received, xpc_initiate_partid_to_nasids);
1301
1302 return 0;
1303
1304
1305out_3:
1306 xpc_teardown_rsvd_page();
1307
1308 (void)unregister_die_notifier(&xpc_die_notifier);
1309 (void)unregister_reboot_notifier(&xpc_reboot_notifier);
1310out_2:
1311 if (xpc_sysctl)
1312 unregister_sysctl_table(xpc_sysctl);
1313
1314 xpc_teardown_partitions();
1315out_1:
1316 if (is_uv_system())
1317 xpc_exit_uv();
1318 return ret;
1319}
1320
1321module_init(xpc_init);
1322
1323static void __exit
1324xpc_exit(void)
1325{
1326 xpc_do_exit(xpUnloading);
1327}
1328
1329module_exit(xpc_exit);
1330
1331MODULE_AUTHOR("Silicon Graphics, Inc.");
1332MODULE_DESCRIPTION("Cross Partition Communication (XPC) support");
1333MODULE_LICENSE("GPL");
1334
1335module_param(xpc_hb_interval, int, 0);
1336MODULE_PARM_DESC(xpc_hb_interval, "Number of seconds between "
1337 "heartbeat increments.");
1338
1339module_param(xpc_hb_check_interval, int, 0);
1340MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between "
1341 "heartbeat checks.");
1342
1343module_param(xpc_disengage_timelimit, int, 0);
1344MODULE_PARM_DESC(xpc_disengage_timelimit, "Number of seconds to wait "
1345 "for disengage to complete.");
1346
1347module_param(xpc_kdebug_ignore, int, 0);
1348MODULE_PARM_DESC(xpc_kdebug_ignore, "Should lack of heartbeat be ignored by "
1349 "other partitions when dropping into kdebug.");
1350