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23#include <linux/types.h>
24#include <linux/kernel.h>
25#include <linux/init.h>
26#include <linux/module.h>
27#include <linux/kthread.h>
28#include <linux/err.h>
29#include <linux/spinlock.h>
30#include <linux/smp.h>
31#include <linux/interrupt.h>
32#include <linux/sched.h>
33#include <linux/atomic.h>
34#include <linux/bitops.h>
35#include <linux/completion.h>
36#include <linux/moduleparam.h>
37#include <linux/percpu.h>
38#include <linux/notifier.h>
39#include <linux/reboot.h>
40#include <linux/freezer.h>
41#include <linux/cpu.h>
42#include <linux/delay.h>
43#include <linux/stat.h>
44#include <linux/slab.h>
45#include <linux/trace_clock.h>
46#include <linux/ktime.h>
47#include <asm/byteorder.h>
48#include <linux/torture.h>
49
50MODULE_LICENSE("GPL");
51MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>");
52
53static char *torture_type;
54static bool verbose;
55
56
57#define FULLSTOP_DONTSTOP 0
58#define FULLSTOP_SHUTDOWN 1
59#define FULLSTOP_RMMOD 2
60static int fullstop = FULLSTOP_RMMOD;
61static DEFINE_MUTEX(fullstop_mutex);
62static int *torture_runnable;
63
64#ifdef CONFIG_HOTPLUG_CPU
65
66
67
68
69
70
71static struct task_struct *onoff_task;
72static long onoff_holdoff;
73static long onoff_interval;
74static long n_offline_attempts;
75static long n_offline_successes;
76static unsigned long sum_offline;
77static int min_offline = -1;
78static int max_offline;
79static long n_online_attempts;
80static long n_online_successes;
81static unsigned long sum_online;
82static int min_online = -1;
83static int max_online;
84
85
86
87
88
89
90bool torture_offline(int cpu, long *n_offl_attempts, long *n_offl_successes,
91 unsigned long *sum_offl, int *min_offl, int *max_offl)
92{
93 unsigned long delta;
94 int ret;
95 unsigned long starttime;
96
97 if (!cpu_online(cpu) || !cpu_is_hotpluggable(cpu))
98 return false;
99
100 if (verbose)
101 pr_alert("%s" TORTURE_FLAG
102 "torture_onoff task: offlining %d\n",
103 torture_type, cpu);
104 starttime = jiffies;
105 (*n_offl_attempts)++;
106 ret = cpu_down(cpu);
107 if (ret) {
108 if (verbose)
109 pr_alert("%s" TORTURE_FLAG
110 "torture_onoff task: offline %d failed: errno %d\n",
111 torture_type, cpu, ret);
112 } else {
113 if (verbose)
114 pr_alert("%s" TORTURE_FLAG
115 "torture_onoff task: offlined %d\n",
116 torture_type, cpu);
117 (*n_offl_successes)++;
118 delta = jiffies - starttime;
119 sum_offl += delta;
120 if (*min_offl < 0) {
121 *min_offl = delta;
122 *max_offl = delta;
123 }
124 if (*min_offl > delta)
125 *min_offl = delta;
126 if (*max_offl < delta)
127 *max_offl = delta;
128 }
129
130 return true;
131}
132EXPORT_SYMBOL_GPL(torture_offline);
133
134
135
136
137
138
139bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
140 unsigned long *sum_onl, int *min_onl, int *max_onl)
141{
142 unsigned long delta;
143 int ret;
144 unsigned long starttime;
145
146 if (cpu_online(cpu) || !cpu_is_hotpluggable(cpu))
147 return false;
148
149 if (verbose)
150 pr_alert("%s" TORTURE_FLAG
151 "torture_onoff task: onlining %d\n",
152 torture_type, cpu);
153 starttime = jiffies;
154 (*n_onl_attempts)++;
155 ret = cpu_up(cpu);
156 if (ret) {
157 if (verbose)
158 pr_alert("%s" TORTURE_FLAG
159 "torture_onoff task: online %d failed: errno %d\n",
160 torture_type, cpu, ret);
161 } else {
162 if (verbose)
163 pr_alert("%s" TORTURE_FLAG
164 "torture_onoff task: onlined %d\n",
165 torture_type, cpu);
166 (*n_onl_successes)++;
167 delta = jiffies - starttime;
168 *sum_onl += delta;
169 if (*min_onl < 0) {
170 *min_onl = delta;
171 *max_onl = delta;
172 }
173 if (*min_onl > delta)
174 *min_onl = delta;
175 if (*max_onl < delta)
176 *max_onl = delta;
177 }
178
179 return true;
180}
181EXPORT_SYMBOL_GPL(torture_online);
182
183
184
185
186
187static int
188torture_onoff(void *arg)
189{
190 int cpu;
191 int maxcpu = -1;
192 DEFINE_TORTURE_RANDOM(rand);
193
194 VERBOSE_TOROUT_STRING("torture_onoff task started");
195 for_each_online_cpu(cpu)
196 maxcpu = cpu;
197 WARN_ON(maxcpu < 0);
198
199 if (maxcpu == 0) {
200 VERBOSE_TOROUT_STRING("Only one CPU, so CPU-hotplug testing is disabled");
201 goto stop;
202 }
203
204 if (onoff_holdoff > 0) {
205 VERBOSE_TOROUT_STRING("torture_onoff begin holdoff");
206 schedule_timeout_interruptible(onoff_holdoff);
207 VERBOSE_TOROUT_STRING("torture_onoff end holdoff");
208 }
209 while (!torture_must_stop()) {
210 cpu = (torture_random(&rand) >> 4) % (maxcpu + 1);
211 if (!torture_offline(cpu,
212 &n_offline_attempts, &n_offline_successes,
213 &sum_offline, &min_offline, &max_offline))
214 torture_online(cpu,
215 &n_online_attempts, &n_online_successes,
216 &sum_online, &min_online, &max_online);
217 schedule_timeout_interruptible(onoff_interval);
218 }
219
220stop:
221 torture_kthread_stopping("torture_onoff");
222 return 0;
223}
224
225#endif
226
227
228
229
230int torture_onoff_init(long ooholdoff, long oointerval)
231{
232 int ret = 0;
233
234#ifdef CONFIG_HOTPLUG_CPU
235 onoff_holdoff = ooholdoff;
236 onoff_interval = oointerval;
237 if (onoff_interval <= 0)
238 return 0;
239 ret = torture_create_kthread(torture_onoff, NULL, onoff_task);
240#endif
241 return ret;
242}
243EXPORT_SYMBOL_GPL(torture_onoff_init);
244
245
246
247
248static void torture_onoff_cleanup(void)
249{
250#ifdef CONFIG_HOTPLUG_CPU
251 if (onoff_task == NULL)
252 return;
253 VERBOSE_TOROUT_STRING("Stopping torture_onoff task");
254 kthread_stop(onoff_task);
255 onoff_task = NULL;
256#endif
257}
258EXPORT_SYMBOL_GPL(torture_onoff_cleanup);
259
260
261
262
263void torture_onoff_stats(void)
264{
265#ifdef CONFIG_HOTPLUG_CPU
266 pr_cont("onoff: %ld/%ld:%ld/%ld %d,%d:%d,%d %lu:%lu (HZ=%d) ",
267 n_online_successes, n_online_attempts,
268 n_offline_successes, n_offline_attempts,
269 min_online, max_online,
270 min_offline, max_offline,
271 sum_online, sum_offline, HZ);
272#endif
273}
274EXPORT_SYMBOL_GPL(torture_onoff_stats);
275
276
277
278
279bool torture_onoff_failures(void)
280{
281#ifdef CONFIG_HOTPLUG_CPU
282 return n_online_successes != n_online_attempts ||
283 n_offline_successes != n_offline_attempts;
284#else
285 return false;
286#endif
287}
288EXPORT_SYMBOL_GPL(torture_onoff_failures);
289
290#define TORTURE_RANDOM_MULT 39916801
291#define TORTURE_RANDOM_ADD 479001701
292#define TORTURE_RANDOM_REFRESH 10000
293
294
295
296
297
298unsigned long
299torture_random(struct torture_random_state *trsp)
300{
301 if (--trsp->trs_count < 0) {
302 trsp->trs_state += (unsigned long)local_clock();
303 trsp->trs_count = TORTURE_RANDOM_REFRESH;
304 }
305 trsp->trs_state = trsp->trs_state * TORTURE_RANDOM_MULT +
306 TORTURE_RANDOM_ADD;
307 return swahw32(trsp->trs_state);
308}
309EXPORT_SYMBOL_GPL(torture_random);
310
311
312
313
314
315
316struct shuffle_task {
317 struct list_head st_l;
318 struct task_struct *st_t;
319};
320
321static long shuffle_interval;
322static struct task_struct *shuffler_task;
323static cpumask_var_t shuffle_tmp_mask;
324static int shuffle_idle_cpu;
325static struct list_head shuffle_task_list = LIST_HEAD_INIT(shuffle_task_list);
326static DEFINE_MUTEX(shuffle_task_mutex);
327
328
329
330
331
332void torture_shuffle_task_register(struct task_struct *tp)
333{
334 struct shuffle_task *stp;
335
336 if (WARN_ON_ONCE(tp == NULL))
337 return;
338 stp = kmalloc(sizeof(*stp), GFP_KERNEL);
339 if (WARN_ON_ONCE(stp == NULL))
340 return;
341 stp->st_t = tp;
342 mutex_lock(&shuffle_task_mutex);
343 list_add(&stp->st_l, &shuffle_task_list);
344 mutex_unlock(&shuffle_task_mutex);
345}
346EXPORT_SYMBOL_GPL(torture_shuffle_task_register);
347
348
349
350
351static void torture_shuffle_task_unregister_all(void)
352{
353 struct shuffle_task *stp;
354 struct shuffle_task *p;
355
356 mutex_lock(&shuffle_task_mutex);
357 list_for_each_entry_safe(stp, p, &shuffle_task_list, st_l) {
358 list_del(&stp->st_l);
359 kfree(stp);
360 }
361 mutex_unlock(&shuffle_task_mutex);
362}
363
364
365
366
367
368static void torture_shuffle_tasks(void)
369{
370 struct shuffle_task *stp;
371
372 cpumask_setall(shuffle_tmp_mask);
373 get_online_cpus();
374
375
376 if (num_online_cpus() == 1) {
377 put_online_cpus();
378 return;
379 }
380
381
382 shuffle_idle_cpu = cpumask_next(shuffle_idle_cpu, shuffle_tmp_mask);
383 if (shuffle_idle_cpu >= nr_cpu_ids)
384 shuffle_idle_cpu = -1;
385 else
386 cpumask_clear_cpu(shuffle_idle_cpu, shuffle_tmp_mask);
387
388 mutex_lock(&shuffle_task_mutex);
389 list_for_each_entry(stp, &shuffle_task_list, st_l)
390 set_cpus_allowed_ptr(stp->st_t, shuffle_tmp_mask);
391 mutex_unlock(&shuffle_task_mutex);
392
393 put_online_cpus();
394}
395
396
397
398
399
400static int torture_shuffle(void *arg)
401{
402 VERBOSE_TOROUT_STRING("torture_shuffle task started");
403 do {
404 schedule_timeout_interruptible(shuffle_interval);
405 torture_shuffle_tasks();
406 torture_shutdown_absorb("torture_shuffle");
407 } while (!torture_must_stop());
408 torture_kthread_stopping("torture_shuffle");
409 return 0;
410}
411
412
413
414
415int torture_shuffle_init(long shuffint)
416{
417 shuffle_interval = shuffint;
418
419 shuffle_idle_cpu = -1;
420
421 if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) {
422 VERBOSE_TOROUT_ERRSTRING("Failed to alloc mask");
423 return -ENOMEM;
424 }
425
426
427 return torture_create_kthread(torture_shuffle, NULL, shuffler_task);
428}
429EXPORT_SYMBOL_GPL(torture_shuffle_init);
430
431
432
433
434static void torture_shuffle_cleanup(void)
435{
436 torture_shuffle_task_unregister_all();
437 if (shuffler_task) {
438 VERBOSE_TOROUT_STRING("Stopping torture_shuffle task");
439 kthread_stop(shuffler_task);
440 free_cpumask_var(shuffle_tmp_mask);
441 }
442 shuffler_task = NULL;
443}
444EXPORT_SYMBOL_GPL(torture_shuffle_cleanup);
445
446
447
448
449
450static struct task_struct *shutdown_task;
451static ktime_t shutdown_time;
452static void (*torture_shutdown_hook)(void);
453
454
455
456
457
458void torture_shutdown_absorb(const char *title)
459{
460 while (READ_ONCE(fullstop) == FULLSTOP_SHUTDOWN) {
461 pr_notice("torture thread %s parking due to system shutdown\n",
462 title);
463 schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT);
464 }
465}
466EXPORT_SYMBOL_GPL(torture_shutdown_absorb);
467
468
469
470
471
472static int torture_shutdown(void *arg)
473{
474 ktime_t ktime_snap;
475
476 VERBOSE_TOROUT_STRING("torture_shutdown task started");
477 ktime_snap = ktime_get();
478 while (ktime_before(ktime_snap, shutdown_time) &&
479 !torture_must_stop()) {
480 if (verbose)
481 pr_alert("%s" TORTURE_FLAG
482 "torture_shutdown task: %llu ms remaining\n",
483 torture_type,
484 ktime_ms_delta(shutdown_time, ktime_snap));
485 set_current_state(TASK_INTERRUPTIBLE);
486 schedule_hrtimeout(&shutdown_time, HRTIMER_MODE_ABS);
487 ktime_snap = ktime_get();
488 }
489 if (torture_must_stop()) {
490 torture_kthread_stopping("torture_shutdown");
491 return 0;
492 }
493
494
495
496 VERBOSE_TOROUT_STRING("torture_shutdown task shutting down system");
497 shutdown_task = NULL;
498 if (torture_shutdown_hook)
499 torture_shutdown_hook();
500 else
501 VERBOSE_TOROUT_STRING("No torture_shutdown_hook(), skipping.");
502 ftrace_dump(DUMP_ALL);
503 kernel_power_off();
504 return 0;
505}
506
507
508
509
510int torture_shutdown_init(int ssecs, void (*cleanup)(void))
511{
512 int ret = 0;
513
514 torture_shutdown_hook = cleanup;
515 if (ssecs > 0) {
516 shutdown_time = ktime_add(ktime_get(), ktime_set(ssecs, 0));
517 ret = torture_create_kthread(torture_shutdown, NULL,
518 shutdown_task);
519 }
520 return ret;
521}
522EXPORT_SYMBOL_GPL(torture_shutdown_init);
523
524
525
526
527static int torture_shutdown_notify(struct notifier_block *unused1,
528 unsigned long unused2, void *unused3)
529{
530 mutex_lock(&fullstop_mutex);
531 if (READ_ONCE(fullstop) == FULLSTOP_DONTSTOP) {
532 VERBOSE_TOROUT_STRING("Unscheduled system shutdown detected");
533 WRITE_ONCE(fullstop, FULLSTOP_SHUTDOWN);
534 } else {
535 pr_warn("Concurrent rmmod and shutdown illegal!\n");
536 }
537 mutex_unlock(&fullstop_mutex);
538 return NOTIFY_DONE;
539}
540
541static struct notifier_block torture_shutdown_nb = {
542 .notifier_call = torture_shutdown_notify,
543};
544
545
546
547
548
549static void torture_shutdown_cleanup(void)
550{
551 unregister_reboot_notifier(&torture_shutdown_nb);
552 if (shutdown_task != NULL) {
553 VERBOSE_TOROUT_STRING("Stopping torture_shutdown task");
554 kthread_stop(shutdown_task);
555 }
556 shutdown_task = NULL;
557}
558
559
560
561
562
563
564static struct task_struct *stutter_task;
565static int stutter_pause_test;
566static int stutter;
567
568
569
570
571
572void stutter_wait(const char *title)
573{
574 cond_resched_rcu_qs();
575 while (READ_ONCE(stutter_pause_test) ||
576 (torture_runnable && !READ_ONCE(*torture_runnable))) {
577 if (stutter_pause_test)
578 if (READ_ONCE(stutter_pause_test) == 1)
579 schedule_timeout_interruptible(1);
580 else
581 while (READ_ONCE(stutter_pause_test))
582 cond_resched();
583 else
584 schedule_timeout_interruptible(round_jiffies_relative(HZ));
585 torture_shutdown_absorb(title);
586 }
587}
588EXPORT_SYMBOL_GPL(stutter_wait);
589
590
591
592
593
594static int torture_stutter(void *arg)
595{
596 VERBOSE_TOROUT_STRING("torture_stutter task started");
597 do {
598 if (!torture_must_stop()) {
599 if (stutter > 1) {
600 schedule_timeout_interruptible(stutter - 1);
601 WRITE_ONCE(stutter_pause_test, 2);
602 }
603 schedule_timeout_interruptible(1);
604 WRITE_ONCE(stutter_pause_test, 1);
605 }
606 if (!torture_must_stop())
607 schedule_timeout_interruptible(stutter);
608 WRITE_ONCE(stutter_pause_test, 0);
609 torture_shutdown_absorb("torture_stutter");
610 } while (!torture_must_stop());
611 torture_kthread_stopping("torture_stutter");
612 return 0;
613}
614
615
616
617
618int torture_stutter_init(int s)
619{
620 int ret;
621
622 stutter = s;
623 ret = torture_create_kthread(torture_stutter, NULL, stutter_task);
624 return ret;
625}
626EXPORT_SYMBOL_GPL(torture_stutter_init);
627
628
629
630
631static void torture_stutter_cleanup(void)
632{
633 if (!stutter_task)
634 return;
635 VERBOSE_TOROUT_STRING("Stopping torture_stutter task");
636 kthread_stop(stutter_task);
637 stutter_task = NULL;
638}
639
640
641
642
643
644
645
646
647
648
649bool torture_init_begin(char *ttype, bool v, int *runnable)
650{
651 mutex_lock(&fullstop_mutex);
652 if (torture_type != NULL) {
653 pr_alert("torture_init_begin: Refusing %s init: %s running.\n",
654 ttype, torture_type);
655 pr_alert("torture_init_begin: One torture test at a time!\n");
656 mutex_unlock(&fullstop_mutex);
657 return false;
658 }
659 torture_type = ttype;
660 verbose = v;
661 torture_runnable = runnable;
662 fullstop = FULLSTOP_DONTSTOP;
663 return true;
664}
665EXPORT_SYMBOL_GPL(torture_init_begin);
666
667
668
669
670void torture_init_end(void)
671{
672 mutex_unlock(&fullstop_mutex);
673 register_reboot_notifier(&torture_shutdown_nb);
674}
675EXPORT_SYMBOL_GPL(torture_init_end);
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692bool torture_cleanup_begin(void)
693{
694 mutex_lock(&fullstop_mutex);
695 if (READ_ONCE(fullstop) == FULLSTOP_SHUTDOWN) {
696 pr_warn("Concurrent rmmod and shutdown illegal!\n");
697 mutex_unlock(&fullstop_mutex);
698 schedule_timeout_uninterruptible(10);
699 return true;
700 }
701 WRITE_ONCE(fullstop, FULLSTOP_RMMOD);
702 mutex_unlock(&fullstop_mutex);
703 torture_shutdown_cleanup();
704 torture_shuffle_cleanup();
705 torture_stutter_cleanup();
706 torture_onoff_cleanup();
707 return false;
708}
709EXPORT_SYMBOL_GPL(torture_cleanup_begin);
710
711void torture_cleanup_end(void)
712{
713 mutex_lock(&fullstop_mutex);
714 torture_type = NULL;
715 mutex_unlock(&fullstop_mutex);
716}
717EXPORT_SYMBOL_GPL(torture_cleanup_end);
718
719
720
721
722bool torture_must_stop(void)
723{
724 return torture_must_stop_irq() || kthread_should_stop();
725}
726EXPORT_SYMBOL_GPL(torture_must_stop);
727
728
729
730
731
732bool torture_must_stop_irq(void)
733{
734 return READ_ONCE(fullstop) != FULLSTOP_DONTSTOP;
735}
736EXPORT_SYMBOL_GPL(torture_must_stop_irq);
737
738
739
740
741
742
743
744
745void torture_kthread_stopping(char *title)
746{
747 char buf[128];
748
749 snprintf(buf, sizeof(buf), "Stopping %s", title);
750 VERBOSE_TOROUT_STRING(buf);
751 while (!kthread_should_stop()) {
752 torture_shutdown_absorb(title);
753 schedule_timeout_uninterruptible(1);
754 }
755}
756EXPORT_SYMBOL_GPL(torture_kthread_stopping);
757
758
759
760
761
762
763int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
764 char *f, struct task_struct **tp)
765{
766 int ret = 0;
767
768 VERBOSE_TOROUT_STRING(m);
769 *tp = kthread_run(fn, arg, "%s", s);
770 if (IS_ERR(*tp)) {
771 ret = PTR_ERR(*tp);
772 VERBOSE_TOROUT_ERRSTRING(f);
773 *tp = NULL;
774 }
775 torture_shuffle_task_register(*tp);
776 return ret;
777}
778EXPORT_SYMBOL_GPL(_torture_create_kthread);
779
780
781
782
783void _torture_stop_kthread(char *m, struct task_struct **tp)
784{
785 if (*tp == NULL)
786 return;
787 VERBOSE_TOROUT_STRING(m);
788 kthread_stop(*tp);
789 *tp = NULL;
790}
791EXPORT_SYMBOL_GPL(_torture_stop_kthread);
792