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46#include <linux/module.h>
47#include <linux/slab.h>
48#include <linux/sysctl.h>
49#include <linux/device.h>
50#include <linux/delay.h>
51#include <linux/reboot.h>
52#include <linux/kdebug.h>
53#include <linux/kthread.h>
54#include "xpc.h"
55
56#ifdef CONFIG_X86_64
57#include <asm/traps.h>
58#endif
59
60
61
62struct device_driver xpc_dbg_name = {
63 .name = "xpc"
64};
65
66struct device xpc_part_dbg_subname = {
67 .init_name = "",
68 .driver = &xpc_dbg_name
69};
70
71struct device xpc_chan_dbg_subname = {
72 .init_name = "",
73 .driver = &xpc_dbg_name
74};
75
76struct device *xpc_part = &xpc_part_dbg_subname;
77struct device *xpc_chan = &xpc_chan_dbg_subname;
78
79static int xpc_kdebug_ignore;
80
81
82
83static int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL;
84static int xpc_hb_min_interval = 1;
85static int xpc_hb_max_interval = 10;
86
87static int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_INTERVAL;
88static int xpc_hb_check_min_interval = 10;
89static int xpc_hb_check_max_interval = 120;
90
91int xpc_disengage_timelimit = XPC_DISENGAGE_DEFAULT_TIMELIMIT;
92static int xpc_disengage_min_timelimit;
93static int xpc_disengage_max_timelimit = 120;
94
95static struct ctl_table xpc_sys_xpc_hb_dir[] = {
96 {
97 .procname = "hb_interval",
98 .data = &xpc_hb_interval,
99 .maxlen = sizeof(int),
100 .mode = 0644,
101 .proc_handler = proc_dointvec_minmax,
102 .extra1 = &xpc_hb_min_interval,
103 .extra2 = &xpc_hb_max_interval},
104 {
105 .procname = "hb_check_interval",
106 .data = &xpc_hb_check_interval,
107 .maxlen = sizeof(int),
108 .mode = 0644,
109 .proc_handler = proc_dointvec_minmax,
110 .extra1 = &xpc_hb_check_min_interval,
111 .extra2 = &xpc_hb_check_max_interval},
112 {}
113};
114static struct ctl_table xpc_sys_xpc_dir[] = {
115 {
116 .procname = "hb",
117 .mode = 0555,
118 .child = xpc_sys_xpc_hb_dir},
119 {
120 .procname = "disengage_timelimit",
121 .data = &xpc_disengage_timelimit,
122 .maxlen = sizeof(int),
123 .mode = 0644,
124 .proc_handler = proc_dointvec_minmax,
125 .extra1 = &xpc_disengage_min_timelimit,
126 .extra2 = &xpc_disengage_max_timelimit},
127 {}
128};
129static struct ctl_table xpc_sys_dir[] = {
130 {
131 .procname = "xpc",
132 .mode = 0555,
133 .child = xpc_sys_xpc_dir},
134 {}
135};
136static struct ctl_table_header *xpc_sysctl;
137
138
139int xpc_disengage_timedout;
140
141
142int xpc_activate_IRQ_rcvd;
143DEFINE_SPINLOCK(xpc_activate_IRQ_rcvd_lock);
144
145
146DECLARE_WAIT_QUEUE_HEAD(xpc_activate_IRQ_wq);
147
148static unsigned long xpc_hb_check_timeout;
149static struct timer_list xpc_hb_timer;
150
151
152static DECLARE_COMPLETION(xpc_hb_checker_exited);
153
154
155static DECLARE_COMPLETION(xpc_discovery_exited);
156
157static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *);
158
159static int xpc_system_reboot(struct notifier_block *, unsigned long, void *);
160static struct notifier_block xpc_reboot_notifier = {
161 .notifier_call = xpc_system_reboot,
162};
163
164static int xpc_system_die(struct notifier_block *, unsigned long, void *);
165static struct notifier_block xpc_die_notifier = {
166 .notifier_call = xpc_system_die,
167};
168
169struct xpc_arch_operations xpc_arch_ops;
170
171
172
173
174static void
175xpc_timeout_partition_disengage(struct timer_list *t)
176{
177 struct xpc_partition *part = from_timer(part, t, disengage_timer);
178
179 DBUG_ON(time_is_after_jiffies(part->disengage_timeout));
180
181 (void)xpc_partition_disengaged(part);
182
183 DBUG_ON(part->disengage_timeout != 0);
184 DBUG_ON(xpc_arch_ops.partition_engaged(XPC_PARTID(part)));
185}
186
187
188
189
190
191
192static void
193xpc_hb_beater(struct timer_list *unused)
194{
195 xpc_arch_ops.increment_heartbeat();
196
197 if (time_is_before_eq_jiffies(xpc_hb_check_timeout))
198 wake_up_interruptible(&xpc_activate_IRQ_wq);
199
200 xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ);
201 add_timer(&xpc_hb_timer);
202}
203
204static void
205xpc_start_hb_beater(void)
206{
207 xpc_arch_ops.heartbeat_init();
208 timer_setup(&xpc_hb_timer, xpc_hb_beater, 0);
209 xpc_hb_beater(0);
210}
211
212static void
213xpc_stop_hb_beater(void)
214{
215 del_timer_sync(&xpc_hb_timer);
216 xpc_arch_ops.heartbeat_exit();
217}
218
219
220
221
222
223static void
224xpc_check_remote_hb(void)
225{
226 struct xpc_partition *part;
227 short partid;
228 enum xp_retval ret;
229
230 for (partid = 0; partid < xp_max_npartitions; partid++) {
231
232 if (xpc_exiting)
233 break;
234
235 if (partid == xp_partition_id)
236 continue;
237
238 part = &xpc_partitions[partid];
239
240 if (part->act_state == XPC_P_AS_INACTIVE ||
241 part->act_state == XPC_P_AS_DEACTIVATING) {
242 continue;
243 }
244
245 ret = xpc_arch_ops.get_remote_heartbeat(part);
246 if (ret != xpSuccess)
247 XPC_DEACTIVATE_PARTITION(part, ret);
248 }
249}
250
251
252
253
254
255static int
256xpc_hb_checker(void *ignore)
257{
258 int force_IRQ = 0;
259
260
261
262 set_cpus_allowed_ptr(current, cpumask_of(XPC_HB_CHECK_CPU));
263
264
265 xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ);
266 xpc_start_hb_beater();
267
268 while (!xpc_exiting) {
269
270 dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have "
271 "been received\n",
272 (int)(xpc_hb_check_timeout - jiffies),
273 xpc_activate_IRQ_rcvd);
274
275
276 if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) {
277 xpc_hb_check_timeout = jiffies +
278 (xpc_hb_check_interval * HZ);
279
280 dev_dbg(xpc_part, "checking remote heartbeats\n");
281 xpc_check_remote_hb();
282
283
284
285
286
287 if (is_shub())
288 force_IRQ = 1;
289 }
290
291
292 if (xpc_activate_IRQ_rcvd > 0 || force_IRQ != 0) {
293 force_IRQ = 0;
294 dev_dbg(xpc_part, "processing activate IRQs "
295 "received\n");
296 xpc_arch_ops.process_activate_IRQ_rcvd();
297 }
298
299
300 (void)wait_event_interruptible(xpc_activate_IRQ_wq,
301 (time_is_before_eq_jiffies(
302 xpc_hb_check_timeout) ||
303 xpc_activate_IRQ_rcvd > 0 ||
304 xpc_exiting));
305 }
306
307 xpc_stop_hb_beater();
308
309 dev_dbg(xpc_part, "heartbeat checker is exiting\n");
310
311
312 complete(&xpc_hb_checker_exited);
313 return 0;
314}
315
316
317
318
319
320
321static int
322xpc_initiate_discovery(void *ignore)
323{
324 xpc_discovery();
325
326 dev_dbg(xpc_part, "discovery thread is exiting\n");
327
328
329 complete(&xpc_discovery_exited);
330 return 0;
331}
332
333
334
335
336
337
338
339
340
341
342
343
344
345static void
346xpc_channel_mgr(struct xpc_partition *part)
347{
348 while (part->act_state != XPC_P_AS_DEACTIVATING ||
349 atomic_read(&part->nchannels_active) > 0 ||
350 !xpc_partition_disengaged(part)) {
351
352 xpc_process_sent_chctl_flags(part);
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367 atomic_dec(&part->channel_mgr_requests);
368 (void)wait_event_interruptible(part->channel_mgr_wq,
369 (atomic_read(&part->channel_mgr_requests) > 0 ||
370 part->chctl.all_flags != 0 ||
371 (part->act_state == XPC_P_AS_DEACTIVATING &&
372 atomic_read(&part->nchannels_active) == 0 &&
373 xpc_partition_disengaged(part))));
374 atomic_set(&part->channel_mgr_requests, 1);
375 }
376}
377
378
379
380
381void *
382xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
383{
384
385 *base = kzalloc(size, flags);
386 if (*base == NULL)
387 return NULL;
388
389 if ((u64)*base == L1_CACHE_ALIGN((u64)*base))
390 return *base;
391
392 kfree(*base);
393
394
395 *base = kzalloc(size + L1_CACHE_BYTES, flags);
396 if (*base == NULL)
397 return NULL;
398
399 return (void *)L1_CACHE_ALIGN((u64)*base);
400}
401
402
403
404
405
406static enum xp_retval
407xpc_setup_ch_structures(struct xpc_partition *part)
408{
409 enum xp_retval ret;
410 int ch_number;
411 struct xpc_channel *ch;
412 short partid = XPC_PARTID(part);
413
414
415
416
417
418 DBUG_ON(part->channels != NULL);
419 part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_MAX_NCHANNELS,
420 GFP_KERNEL);
421 if (part->channels == NULL) {
422 dev_err(xpc_chan, "can't get memory for channels\n");
423 return xpNoMemory;
424 }
425
426
427
428 part->remote_openclose_args =
429 xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE,
430 GFP_KERNEL, &part->
431 remote_openclose_args_base);
432 if (part->remote_openclose_args == NULL) {
433 dev_err(xpc_chan, "can't get memory for remote connect args\n");
434 ret = xpNoMemory;
435 goto out_1;
436 }
437
438 part->chctl.all_flags = 0;
439 spin_lock_init(&part->chctl_lock);
440
441 atomic_set(&part->channel_mgr_requests, 1);
442 init_waitqueue_head(&part->channel_mgr_wq);
443
444 part->nchannels = XPC_MAX_NCHANNELS;
445
446 atomic_set(&part->nchannels_active, 0);
447 atomic_set(&part->nchannels_engaged, 0);
448
449 for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
450 ch = &part->channels[ch_number];
451
452 ch->partid = partid;
453 ch->number = ch_number;
454 ch->flags = XPC_C_DISCONNECTED;
455
456 atomic_set(&ch->kthreads_assigned, 0);
457 atomic_set(&ch->kthreads_idle, 0);
458 atomic_set(&ch->kthreads_active, 0);
459
460 atomic_set(&ch->references, 0);
461 atomic_set(&ch->n_to_notify, 0);
462
463 spin_lock_init(&ch->lock);
464 init_completion(&ch->wdisconnect_wait);
465
466 atomic_set(&ch->n_on_msg_allocate_wq, 0);
467 init_waitqueue_head(&ch->msg_allocate_wq);
468 init_waitqueue_head(&ch->idle_wq);
469 }
470
471 ret = xpc_arch_ops.setup_ch_structures(part);
472 if (ret != xpSuccess)
473 goto out_2;
474
475
476
477
478
479 part->setup_state = XPC_P_SS_SETUP;
480
481 return xpSuccess;
482
483
484out_2:
485 kfree(part->remote_openclose_args_base);
486 part->remote_openclose_args = NULL;
487out_1:
488 kfree(part->channels);
489 part->channels = NULL;
490 return ret;
491}
492
493
494
495
496
497static void
498xpc_teardown_ch_structures(struct xpc_partition *part)
499{
500 DBUG_ON(atomic_read(&part->nchannels_engaged) != 0);
501 DBUG_ON(atomic_read(&part->nchannels_active) != 0);
502
503
504
505
506
507
508 DBUG_ON(part->setup_state != XPC_P_SS_SETUP);
509 part->setup_state = XPC_P_SS_WTEARDOWN;
510
511 wait_event(part->teardown_wq, (atomic_read(&part->references) == 0));
512
513
514
515 xpc_arch_ops.teardown_ch_structures(part);
516
517 kfree(part->remote_openclose_args_base);
518 part->remote_openclose_args = NULL;
519 kfree(part->channels);
520 part->channels = NULL;
521
522 part->setup_state = XPC_P_SS_TORNDOWN;
523}
524
525
526
527
528
529
530
531
532
533
534
535
536static int
537xpc_activating(void *__partid)
538{
539 short partid = (u64)__partid;
540 struct xpc_partition *part = &xpc_partitions[partid];
541 unsigned long irq_flags;
542
543 DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
544
545 spin_lock_irqsave(&part->act_lock, irq_flags);
546
547 if (part->act_state == XPC_P_AS_DEACTIVATING) {
548 part->act_state = XPC_P_AS_INACTIVE;
549 spin_unlock_irqrestore(&part->act_lock, irq_flags);
550 part->remote_rp_pa = 0;
551 return 0;
552 }
553
554
555 DBUG_ON(part->act_state != XPC_P_AS_ACTIVATION_REQ);
556 part->act_state = XPC_P_AS_ACTIVATING;
557
558 XPC_SET_REASON(part, 0, 0);
559 spin_unlock_irqrestore(&part->act_lock, irq_flags);
560
561 dev_dbg(xpc_part, "activating partition %d\n", partid);
562
563 xpc_arch_ops.allow_hb(partid);
564
565 if (xpc_setup_ch_structures(part) == xpSuccess) {
566 (void)xpc_part_ref(part);
567
568 if (xpc_arch_ops.make_first_contact(part) == xpSuccess) {
569 xpc_mark_partition_active(part);
570 xpc_channel_mgr(part);
571
572 }
573
574 xpc_part_deref(part);
575 xpc_teardown_ch_structures(part);
576 }
577
578 xpc_arch_ops.disallow_hb(partid);
579 xpc_mark_partition_inactive(part);
580
581 if (part->reason == xpReactivating) {
582
583 xpc_arch_ops.request_partition_reactivation(part);
584 }
585
586 return 0;
587}
588
589void
590xpc_activate_partition(struct xpc_partition *part)
591{
592 short partid = XPC_PARTID(part);
593 unsigned long irq_flags;
594 struct task_struct *kthread;
595
596 spin_lock_irqsave(&part->act_lock, irq_flags);
597
598 DBUG_ON(part->act_state != XPC_P_AS_INACTIVE);
599
600 part->act_state = XPC_P_AS_ACTIVATION_REQ;
601 XPC_SET_REASON(part, xpCloneKThread, __LINE__);
602
603 spin_unlock_irqrestore(&part->act_lock, irq_flags);
604
605 kthread = kthread_run(xpc_activating, (void *)((u64)partid), "xpc%02d",
606 partid);
607 if (IS_ERR(kthread)) {
608 spin_lock_irqsave(&part->act_lock, irq_flags);
609 part->act_state = XPC_P_AS_INACTIVE;
610 XPC_SET_REASON(part, xpCloneKThreadFailed, __LINE__);
611 spin_unlock_irqrestore(&part->act_lock, irq_flags);
612 }
613}
614
615void
616xpc_activate_kthreads(struct xpc_channel *ch, int needed)
617{
618 int idle = atomic_read(&ch->kthreads_idle);
619 int assigned = atomic_read(&ch->kthreads_assigned);
620 int wakeup;
621
622 DBUG_ON(needed <= 0);
623
624 if (idle > 0) {
625 wakeup = (needed > idle) ? idle : needed;
626 needed -= wakeup;
627
628 dev_dbg(xpc_chan, "wakeup %d idle kthreads, partid=%d, "
629 "channel=%d\n", wakeup, ch->partid, ch->number);
630
631
632 wake_up_nr(&ch->idle_wq, wakeup);
633 }
634
635 if (needed <= 0)
636 return;
637
638 if (needed + assigned > ch->kthreads_assigned_limit) {
639 needed = ch->kthreads_assigned_limit - assigned;
640 if (needed <= 0)
641 return;
642 }
643
644 dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n",
645 needed, ch->partid, ch->number);
646
647 xpc_create_kthreads(ch, needed, 0);
648}
649
650
651
652
653static void
654xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch)
655{
656 int (*n_of_deliverable_payloads) (struct xpc_channel *) =
657 xpc_arch_ops.n_of_deliverable_payloads;
658
659 do {
660
661
662 while (n_of_deliverable_payloads(ch) > 0 &&
663 !(ch->flags & XPC_C_DISCONNECTING)) {
664 xpc_deliver_payload(ch);
665 }
666
667 if (atomic_inc_return(&ch->kthreads_idle) >
668 ch->kthreads_idle_limit) {
669
670 atomic_dec(&ch->kthreads_idle);
671 break;
672 }
673
674 dev_dbg(xpc_chan, "idle kthread calling "
675 "wait_event_interruptible_exclusive()\n");
676
677 (void)wait_event_interruptible_exclusive(ch->idle_wq,
678 (n_of_deliverable_payloads(ch) > 0 ||
679 (ch->flags & XPC_C_DISCONNECTING)));
680
681 atomic_dec(&ch->kthreads_idle);
682
683 } while (!(ch->flags & XPC_C_DISCONNECTING));
684}
685
686static int
687xpc_kthread_start(void *args)
688{
689 short partid = XPC_UNPACK_ARG1(args);
690 u16 ch_number = XPC_UNPACK_ARG2(args);
691 struct xpc_partition *part = &xpc_partitions[partid];
692 struct xpc_channel *ch;
693 int n_needed;
694 unsigned long irq_flags;
695 int (*n_of_deliverable_payloads) (struct xpc_channel *) =
696 xpc_arch_ops.n_of_deliverable_payloads;
697
698 dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n",
699 partid, ch_number);
700
701 ch = &part->channels[ch_number];
702
703 if (!(ch->flags & XPC_C_DISCONNECTING)) {
704
705
706
707 spin_lock_irqsave(&ch->lock, irq_flags);
708 if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) {
709 ch->flags |= XPC_C_CONNECTEDCALLOUT;
710 spin_unlock_irqrestore(&ch->lock, irq_flags);
711
712 xpc_connected_callout(ch);
713
714 spin_lock_irqsave(&ch->lock, irq_flags);
715 ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE;
716 spin_unlock_irqrestore(&ch->lock, irq_flags);
717
718
719
720
721
722
723
724
725 n_needed = n_of_deliverable_payloads(ch) - 1;
726 if (n_needed > 0 && !(ch->flags & XPC_C_DISCONNECTING))
727 xpc_activate_kthreads(ch, n_needed);
728
729 } else {
730 spin_unlock_irqrestore(&ch->lock, irq_flags);
731 }
732
733 xpc_kthread_waitmsgs(part, ch);
734 }
735
736
737
738 spin_lock_irqsave(&ch->lock, irq_flags);
739 if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
740 !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
741 ch->flags |= XPC_C_DISCONNECTINGCALLOUT;
742 spin_unlock_irqrestore(&ch->lock, irq_flags);
743
744 xpc_disconnect_callout(ch, xpDisconnecting);
745
746 spin_lock_irqsave(&ch->lock, irq_flags);
747 ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE;
748 }
749 spin_unlock_irqrestore(&ch->lock, irq_flags);
750
751 if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
752 atomic_dec_return(&part->nchannels_engaged) == 0) {
753 xpc_arch_ops.indicate_partition_disengaged(part);
754 }
755
756 xpc_msgqueue_deref(ch);
757
758 dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n",
759 partid, ch_number);
760
761 xpc_part_deref(part);
762 return 0;
763}
764
765
766
767
768
769
770
771
772
773
774
775
776
777void
778xpc_create_kthreads(struct xpc_channel *ch, int needed,
779 int ignore_disconnecting)
780{
781 unsigned long irq_flags;
782 u64 args = XPC_PACK_ARGS(ch->partid, ch->number);
783 struct xpc_partition *part = &xpc_partitions[ch->partid];
784 struct task_struct *kthread;
785 void (*indicate_partition_disengaged) (struct xpc_partition *) =
786 xpc_arch_ops.indicate_partition_disengaged;
787
788 while (needed-- > 0) {
789
790
791
792
793
794
795 if (ignore_disconnecting) {
796 if (!atomic_inc_not_zero(&ch->kthreads_assigned)) {
797
798 BUG_ON(!(ch->flags &
799 XPC_C_DISCONNECTINGCALLOUT_MADE));
800 break;
801 }
802
803 } else if (ch->flags & XPC_C_DISCONNECTING) {
804 break;
805
806 } else if (atomic_inc_return(&ch->kthreads_assigned) == 1 &&
807 atomic_inc_return(&part->nchannels_engaged) == 1) {
808 xpc_arch_ops.indicate_partition_engaged(part);
809 }
810 (void)xpc_part_ref(part);
811 xpc_msgqueue_ref(ch);
812
813 kthread = kthread_run(xpc_kthread_start, (void *)args,
814 "xpc%02dc%d", ch->partid, ch->number);
815 if (IS_ERR(kthread)) {
816
817
818
819
820
821
822
823
824
825
826
827
828 if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
829 atomic_dec_return(&part->nchannels_engaged) == 0) {
830 indicate_partition_disengaged(part);
831 }
832 xpc_msgqueue_deref(ch);
833 xpc_part_deref(part);
834
835 if (atomic_read(&ch->kthreads_assigned) <
836 ch->kthreads_idle_limit) {
837
838
839
840
841
842 spin_lock_irqsave(&ch->lock, irq_flags);
843 XPC_DISCONNECT_CHANNEL(ch, xpLackOfResources,
844 &irq_flags);
845 spin_unlock_irqrestore(&ch->lock, irq_flags);
846 }
847 break;
848 }
849 }
850}
851
852void
853xpc_disconnect_wait(int ch_number)
854{
855 unsigned long irq_flags;
856 short partid;
857 struct xpc_partition *part;
858 struct xpc_channel *ch;
859 int wakeup_channel_mgr;
860
861
862 for (partid = 0; partid < xp_max_npartitions; partid++) {
863 part = &xpc_partitions[partid];
864
865 if (!xpc_part_ref(part))
866 continue;
867
868 ch = &part->channels[ch_number];
869
870 if (!(ch->flags & XPC_C_WDISCONNECT)) {
871 xpc_part_deref(part);
872 continue;
873 }
874
875 wait_for_completion(&ch->wdisconnect_wait);
876
877 spin_lock_irqsave(&ch->lock, irq_flags);
878 DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));
879 wakeup_channel_mgr = 0;
880
881 if (ch->delayed_chctl_flags) {
882 if (part->act_state != XPC_P_AS_DEACTIVATING) {
883 spin_lock(&part->chctl_lock);
884 part->chctl.flags[ch->number] |=
885 ch->delayed_chctl_flags;
886 spin_unlock(&part->chctl_lock);
887 wakeup_channel_mgr = 1;
888 }
889 ch->delayed_chctl_flags = 0;
890 }
891
892 ch->flags &= ~XPC_C_WDISCONNECT;
893 spin_unlock_irqrestore(&ch->lock, irq_flags);
894
895 if (wakeup_channel_mgr)
896 xpc_wakeup_channel_mgr(part);
897
898 xpc_part_deref(part);
899 }
900}
901
902static int
903xpc_setup_partitions(void)
904{
905 short partid;
906 struct xpc_partition *part;
907
908 xpc_partitions = kzalloc(sizeof(struct xpc_partition) *
909 xp_max_npartitions, GFP_KERNEL);
910 if (xpc_partitions == NULL) {
911 dev_err(xpc_part, "can't get memory for partition structure\n");
912 return -ENOMEM;
913 }
914
915
916
917
918
919
920
921
922
923 for (partid = 0; partid < xp_max_npartitions; partid++) {
924 part = &xpc_partitions[partid];
925
926 DBUG_ON((u64)part != L1_CACHE_ALIGN((u64)part));
927
928 part->activate_IRQ_rcvd = 0;
929 spin_lock_init(&part->act_lock);
930 part->act_state = XPC_P_AS_INACTIVE;
931 XPC_SET_REASON(part, 0, 0);
932
933 timer_setup(&part->disengage_timer,
934 xpc_timeout_partition_disengage, 0);
935
936 part->setup_state = XPC_P_SS_UNSET;
937 init_waitqueue_head(&part->teardown_wq);
938 atomic_set(&part->references, 0);
939 }
940
941 return xpc_arch_ops.setup_partitions();
942}
943
944static void
945xpc_teardown_partitions(void)
946{
947 xpc_arch_ops.teardown_partitions();
948 kfree(xpc_partitions);
949}
950
951static void
952xpc_do_exit(enum xp_retval reason)
953{
954 short partid;
955 int active_part_count, printed_waiting_msg = 0;
956 struct xpc_partition *part;
957 unsigned long printmsg_time, disengage_timeout = 0;
958
959
960 DBUG_ON(xpc_exiting == 1);
961
962
963
964
965
966
967 xpc_exiting = 1;
968 wake_up_interruptible(&xpc_activate_IRQ_wq);
969
970
971 wait_for_completion(&xpc_discovery_exited);
972
973
974 wait_for_completion(&xpc_hb_checker_exited);
975
976
977 (void)msleep_interruptible(300);
978
979
980
981 printmsg_time = jiffies + (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ);
982 xpc_disengage_timedout = 0;
983
984 do {
985 active_part_count = 0;
986
987 for (partid = 0; partid < xp_max_npartitions; partid++) {
988 part = &xpc_partitions[partid];
989
990 if (xpc_partition_disengaged(part) &&
991 part->act_state == XPC_P_AS_INACTIVE) {
992 continue;
993 }
994
995 active_part_count++;
996
997 XPC_DEACTIVATE_PARTITION(part, reason);
998
999 if (part->disengage_timeout > disengage_timeout)
1000 disengage_timeout = part->disengage_timeout;
1001 }
1002
1003 if (xpc_arch_ops.any_partition_engaged()) {
1004 if (time_is_before_jiffies(printmsg_time)) {
1005 dev_info(xpc_part, "waiting for remote "
1006 "partitions to deactivate, timeout in "
1007 "%ld seconds\n", (disengage_timeout -
1008 jiffies) / HZ);
1009 printmsg_time = jiffies +
1010 (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ);
1011 printed_waiting_msg = 1;
1012 }
1013
1014 } else if (active_part_count > 0) {
1015 if (printed_waiting_msg) {
1016 dev_info(xpc_part, "waiting for local partition"
1017 " to deactivate\n");
1018 printed_waiting_msg = 0;
1019 }
1020
1021 } else {
1022 if (!xpc_disengage_timedout) {
1023 dev_info(xpc_part, "all partitions have "
1024 "deactivated\n");
1025 }
1026 break;
1027 }
1028
1029
1030 (void)msleep_interruptible(300);
1031
1032 } while (1);
1033
1034 DBUG_ON(xpc_arch_ops.any_partition_engaged());
1035
1036 xpc_teardown_rsvd_page();
1037
1038 if (reason == xpUnloading) {
1039 (void)unregister_die_notifier(&xpc_die_notifier);
1040 (void)unregister_reboot_notifier(&xpc_reboot_notifier);
1041 }
1042
1043
1044 xpc_clear_interface();
1045
1046 if (xpc_sysctl)
1047 unregister_sysctl_table(xpc_sysctl);
1048
1049 xpc_teardown_partitions();
1050
1051 if (is_shub())
1052 xpc_exit_sn2();
1053 else if (is_uv())
1054 xpc_exit_uv();
1055}
1056
1057
1058
1059
1060static int
1061xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused)
1062{
1063 enum xp_retval reason;
1064
1065 switch (event) {
1066 case SYS_RESTART:
1067 reason = xpSystemReboot;
1068 break;
1069 case SYS_HALT:
1070 reason = xpSystemHalt;
1071 break;
1072 case SYS_POWER_OFF:
1073 reason = xpSystemPoweroff;
1074 break;
1075 default:
1076 reason = xpSystemGoingDown;
1077 }
1078
1079 xpc_do_exit(reason);
1080 return NOTIFY_DONE;
1081}
1082
1083
1084static unsigned int xpc_die_disconnecting;
1085
1086
1087
1088
1089
1090static void
1091xpc_die_deactivate(void)
1092{
1093 struct xpc_partition *part;
1094 short partid;
1095 int any_engaged;
1096 long keep_waiting;
1097 long wait_to_print;
1098
1099 if (cmpxchg(&xpc_die_disconnecting, 0, 1))
1100 return;
1101
1102
1103 xpc_exiting = 1;
1104
1105 xpc_arch_ops.disallow_all_hbs();
1106
1107 for (partid = 0; partid < xp_max_npartitions; partid++) {
1108 part = &xpc_partitions[partid];
1109
1110 if (xpc_arch_ops.partition_engaged(partid) ||
1111 part->act_state != XPC_P_AS_INACTIVE) {
1112 xpc_arch_ops.request_partition_deactivation(part);
1113 xpc_arch_ops.indicate_partition_disengaged(part);
1114 }
1115 }
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126 keep_waiting = xpc_disengage_timelimit * 1000 * 5;
1127 wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * 1000 * 5;
1128
1129 while (1) {
1130 any_engaged = xpc_arch_ops.any_partition_engaged();
1131 if (!any_engaged) {
1132 dev_info(xpc_part, "all partitions have deactivated\n");
1133 break;
1134 }
1135
1136 if (!keep_waiting--) {
1137 for (partid = 0; partid < xp_max_npartitions;
1138 partid++) {
1139 if (xpc_arch_ops.partition_engaged(partid)) {
1140 dev_info(xpc_part, "deactivate from "
1141 "remote partition %d timed "
1142 "out\n", partid);
1143 }
1144 }
1145 break;
1146 }
1147
1148 if (!wait_to_print--) {
1149 dev_info(xpc_part, "waiting for remote partitions to "
1150 "deactivate, timeout in %ld seconds\n",
1151 keep_waiting / (1000 * 5));
1152 wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL *
1153 1000 * 5;
1154 }
1155
1156 udelay(200);
1157 }
1158}
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168static int
1169xpc_system_die(struct notifier_block *nb, unsigned long event, void *_die_args)
1170{
1171#ifdef CONFIG_IA64
1172 switch (event) {
1173 case DIE_MACHINE_RESTART:
1174 case DIE_MACHINE_HALT:
1175 xpc_die_deactivate();
1176 break;
1177
1178 case DIE_KDEBUG_ENTER:
1179
1180 if (!xpc_kdebug_ignore)
1181 break;
1182
1183
1184 case DIE_MCA_MONARCH_ENTER:
1185 case DIE_INIT_MONARCH_ENTER:
1186 xpc_arch_ops.offline_heartbeat();
1187 break;
1188
1189 case DIE_KDEBUG_LEAVE:
1190
1191 if (!xpc_kdebug_ignore)
1192 break;
1193
1194
1195 case DIE_MCA_MONARCH_LEAVE:
1196 case DIE_INIT_MONARCH_LEAVE:
1197 xpc_arch_ops.online_heartbeat();
1198 break;
1199 }
1200#else
1201 struct die_args *die_args = _die_args;
1202
1203 switch (event) {
1204 case DIE_TRAP:
1205 if (die_args->trapnr == X86_TRAP_DF)
1206 xpc_die_deactivate();
1207
1208 if (((die_args->trapnr == X86_TRAP_MF) ||
1209 (die_args->trapnr == X86_TRAP_XF)) &&
1210 !user_mode(die_args->regs))
1211 xpc_die_deactivate();
1212
1213 break;
1214 case DIE_INT3:
1215 case DIE_DEBUG:
1216 break;
1217 case DIE_OOPS:
1218 case DIE_GPF:
1219 default:
1220 xpc_die_deactivate();
1221 }
1222#endif
1223
1224 return NOTIFY_DONE;
1225}
1226
1227int __init
1228xpc_init(void)
1229{
1230 int ret;
1231 struct task_struct *kthread;
1232
1233 dev_set_name(xpc_part, "part");
1234 dev_set_name(xpc_chan, "chan");
1235
1236 if (is_shub()) {
1237
1238
1239
1240
1241
1242
1243 if (xp_max_npartitions != 64) {
1244 dev_err(xpc_part, "max #of partitions not set to 64\n");
1245 ret = -EINVAL;
1246 } else {
1247 ret = xpc_init_sn2();
1248 }
1249
1250 } else if (is_uv()) {
1251 ret = xpc_init_uv();
1252
1253 } else {
1254 ret = -ENODEV;
1255 }
1256
1257 if (ret != 0)
1258 return ret;
1259
1260 ret = xpc_setup_partitions();
1261 if (ret != 0) {
1262 dev_err(xpc_part, "can't get memory for partition structure\n");
1263 goto out_1;
1264 }
1265
1266 xpc_sysctl = register_sysctl_table(xpc_sys_dir);
1267
1268
1269
1270
1271
1272
1273 ret = xpc_setup_rsvd_page();
1274 if (ret != 0) {
1275 dev_err(xpc_part, "can't setup our reserved page\n");
1276 goto out_2;
1277 }
1278
1279
1280 ret = register_reboot_notifier(&xpc_reboot_notifier);
1281 if (ret != 0)
1282 dev_warn(xpc_part, "can't register reboot notifier\n");
1283
1284
1285 ret = register_die_notifier(&xpc_die_notifier);
1286 if (ret != 0)
1287 dev_warn(xpc_part, "can't register die notifier\n");
1288
1289
1290
1291
1292
1293 kthread = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME);
1294 if (IS_ERR(kthread)) {
1295 dev_err(xpc_part, "failed while forking hb check thread\n");
1296 ret = -EBUSY;
1297 goto out_3;
1298 }
1299
1300
1301
1302
1303
1304
1305 kthread = kthread_run(xpc_initiate_discovery, NULL,
1306 XPC_DISCOVERY_THREAD_NAME);
1307 if (IS_ERR(kthread)) {
1308 dev_err(xpc_part, "failed while forking discovery thread\n");
1309
1310
1311 complete(&xpc_discovery_exited);
1312
1313 xpc_do_exit(xpUnloading);
1314 return -EBUSY;
1315 }
1316
1317
1318 xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect,
1319 xpc_initiate_send, xpc_initiate_send_notify,
1320 xpc_initiate_received, xpc_initiate_partid_to_nasids);
1321
1322 return 0;
1323
1324
1325out_3:
1326 xpc_teardown_rsvd_page();
1327
1328 (void)unregister_die_notifier(&xpc_die_notifier);
1329 (void)unregister_reboot_notifier(&xpc_reboot_notifier);
1330out_2:
1331 if (xpc_sysctl)
1332 unregister_sysctl_table(xpc_sysctl);
1333
1334 xpc_teardown_partitions();
1335out_1:
1336 if (is_shub())
1337 xpc_exit_sn2();
1338 else if (is_uv())
1339 xpc_exit_uv();
1340 return ret;
1341}
1342
1343module_init(xpc_init);
1344
1345void __exit
1346xpc_exit(void)
1347{
1348 xpc_do_exit(xpUnloading);
1349}
1350
1351module_exit(xpc_exit);
1352
1353MODULE_AUTHOR("Silicon Graphics, Inc.");
1354MODULE_DESCRIPTION("Cross Partition Communication (XPC) support");
1355MODULE_LICENSE("GPL");
1356
1357module_param(xpc_hb_interval, int, 0);
1358MODULE_PARM_DESC(xpc_hb_interval, "Number of seconds between "
1359 "heartbeat increments.");
1360
1361module_param(xpc_hb_check_interval, int, 0);
1362MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between "
1363 "heartbeat checks.");
1364
1365module_param(xpc_disengage_timelimit, int, 0);
1366MODULE_PARM_DESC(xpc_disengage_timelimit, "Number of seconds to wait "
1367 "for disengage to complete.");
1368
1369module_param(xpc_kdebug_ignore, int, 0);
1370MODULE_PARM_DESC(xpc_kdebug_ignore, "Should lack of heartbeat be ignored by "
1371 "other partitions when dropping into kdebug.");
1372