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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * lib/locking-selftest.c
4 *
5 * Testsuite for various locking APIs: spinlocks, rwlocks,
6 * mutexes and rw-semaphores.
7 *
8 * It is checking both false positives and false negatives.
9 *
10 * Started by Ingo Molnar:
11 *
12 * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <[email protected]>
13 */
14#include <linux/rwsem.h>
15#include <linux/mutex.h>
16#include <linux/ww_mutex.h>
17#include <linux/sched.h>
18#include <linux/sched/mm.h>
19#include <linux/delay.h>
20#include <linux/lockdep.h>
21#include <linux/spinlock.h>
22#include <linux/kallsyms.h>
23#include <linux/interrupt.h>
24#include <linux/debug_locks.h>
25#include <linux/irqflags.h>
26#include <linux/rtmutex.h>
27#include <linux/local_lock.h>
28
29#ifdef CONFIG_PREEMPT_RT
30# define NON_RT(...)
31#else
32# define NON_RT(...) __VA_ARGS__
33#endif
34
35/*
36 * Change this to 1 if you want to see the failure printouts:
37 */
38static unsigned int debug_locks_verbose;
39unsigned int force_read_lock_recursive;
40
41static DEFINE_WD_CLASS(ww_lockdep);
42
43static int __init setup_debug_locks_verbose(char *str)
44{
45 get_option(&str, &debug_locks_verbose);
46
47 return 1;
48}
49
50__setup("debug_locks_verbose=", setup_debug_locks_verbose);
51
52#define FAILURE 0
53#define SUCCESS 1
54
55#define LOCKTYPE_SPIN 0x1
56#define LOCKTYPE_RWLOCK 0x2
57#define LOCKTYPE_MUTEX 0x4
58#define LOCKTYPE_RWSEM 0x8
59#define LOCKTYPE_WW 0x10
60#define LOCKTYPE_RTMUTEX 0x20
61#define LOCKTYPE_LL 0x40
62#define LOCKTYPE_SPECIAL 0x80
63
64static struct ww_acquire_ctx t, t2;
65static struct ww_mutex o, o2, o3;
66
67/*
68 * Normal standalone locks, for the circular and irq-context
69 * dependency tests:
70 */
71static DEFINE_SPINLOCK(lock_A);
72static DEFINE_SPINLOCK(lock_B);
73static DEFINE_SPINLOCK(lock_C);
74static DEFINE_SPINLOCK(lock_D);
75
76static DEFINE_RAW_SPINLOCK(raw_lock_A);
77static DEFINE_RAW_SPINLOCK(raw_lock_B);
78
79static DEFINE_RWLOCK(rwlock_A);
80static DEFINE_RWLOCK(rwlock_B);
81static DEFINE_RWLOCK(rwlock_C);
82static DEFINE_RWLOCK(rwlock_D);
83
84static DEFINE_MUTEX(mutex_A);
85static DEFINE_MUTEX(mutex_B);
86static DEFINE_MUTEX(mutex_C);
87static DEFINE_MUTEX(mutex_D);
88
89static DECLARE_RWSEM(rwsem_A);
90static DECLARE_RWSEM(rwsem_B);
91static DECLARE_RWSEM(rwsem_C);
92static DECLARE_RWSEM(rwsem_D);
93
94#ifdef CONFIG_RT_MUTEXES
95
96static DEFINE_RT_MUTEX(rtmutex_A);
97static DEFINE_RT_MUTEX(rtmutex_B);
98static DEFINE_RT_MUTEX(rtmutex_C);
99static DEFINE_RT_MUTEX(rtmutex_D);
100
101#endif
102
103/*
104 * Locks that we initialize dynamically as well so that
105 * e.g. X1 and X2 becomes two instances of the same class,
106 * but X* and Y* are different classes. We do this so that
107 * we do not trigger a real lockup:
108 */
109static DEFINE_SPINLOCK(lock_X1);
110static DEFINE_SPINLOCK(lock_X2);
111static DEFINE_SPINLOCK(lock_Y1);
112static DEFINE_SPINLOCK(lock_Y2);
113static DEFINE_SPINLOCK(lock_Z1);
114static DEFINE_SPINLOCK(lock_Z2);
115
116static DEFINE_RWLOCK(rwlock_X1);
117static DEFINE_RWLOCK(rwlock_X2);
118static DEFINE_RWLOCK(rwlock_Y1);
119static DEFINE_RWLOCK(rwlock_Y2);
120static DEFINE_RWLOCK(rwlock_Z1);
121static DEFINE_RWLOCK(rwlock_Z2);
122
123static DEFINE_MUTEX(mutex_X1);
124static DEFINE_MUTEX(mutex_X2);
125static DEFINE_MUTEX(mutex_Y1);
126static DEFINE_MUTEX(mutex_Y2);
127static DEFINE_MUTEX(mutex_Z1);
128static DEFINE_MUTEX(mutex_Z2);
129
130static DECLARE_RWSEM(rwsem_X1);
131static DECLARE_RWSEM(rwsem_X2);
132static DECLARE_RWSEM(rwsem_Y1);
133static DECLARE_RWSEM(rwsem_Y2);
134static DECLARE_RWSEM(rwsem_Z1);
135static DECLARE_RWSEM(rwsem_Z2);
136
137#ifdef CONFIG_RT_MUTEXES
138
139static DEFINE_RT_MUTEX(rtmutex_X1);
140static DEFINE_RT_MUTEX(rtmutex_X2);
141static DEFINE_RT_MUTEX(rtmutex_Y1);
142static DEFINE_RT_MUTEX(rtmutex_Y2);
143static DEFINE_RT_MUTEX(rtmutex_Z1);
144static DEFINE_RT_MUTEX(rtmutex_Z2);
145
146#endif
147
148static DEFINE_PER_CPU(local_lock_t, local_A);
149
150/*
151 * non-inlined runtime initializers, to let separate locks share
152 * the same lock-class:
153 */
154#define INIT_CLASS_FUNC(class) \
155static noinline void \
156init_class_##class(spinlock_t *lock, rwlock_t *rwlock, \
157 struct mutex *mutex, struct rw_semaphore *rwsem)\
158{ \
159 spin_lock_init(lock); \
160 rwlock_init(rwlock); \
161 mutex_init(mutex); \
162 init_rwsem(rwsem); \
163}
164
165INIT_CLASS_FUNC(X)
166INIT_CLASS_FUNC(Y)
167INIT_CLASS_FUNC(Z)
168
169static void init_shared_classes(void)
170{
171#ifdef CONFIG_RT_MUTEXES
172 static struct lock_class_key rt_X, rt_Y, rt_Z;
173
174 __rt_mutex_init(&rtmutex_X1, __func__, &rt_X);
175 __rt_mutex_init(&rtmutex_X2, __func__, &rt_X);
176 __rt_mutex_init(&rtmutex_Y1, __func__, &rt_Y);
177 __rt_mutex_init(&rtmutex_Y2, __func__, &rt_Y);
178 __rt_mutex_init(&rtmutex_Z1, __func__, &rt_Z);
179 __rt_mutex_init(&rtmutex_Z2, __func__, &rt_Z);
180#endif
181
182 init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1);
183 init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2);
184
185 init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1);
186 init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2);
187
188 init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1);
189 init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2);
190}
191
192/*
193 * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests.
194 * The following functions use a lock from a simulated hardirq/softirq
195 * context, causing the locks to be marked as hardirq-safe/softirq-safe:
196 */
197
198#define HARDIRQ_DISABLE local_irq_disable
199#define HARDIRQ_ENABLE local_irq_enable
200
201#define HARDIRQ_ENTER() \
202 local_irq_disable(); \
203 __irq_enter(); \
204 lockdep_hardirq_threaded(); \
205 WARN_ON(!in_hardirq());
206
207#define HARDIRQ_EXIT() \
208 __irq_exit(); \
209 local_irq_enable();
210
211#define SOFTIRQ_DISABLE local_bh_disable
212#define SOFTIRQ_ENABLE local_bh_enable
213
214#define SOFTIRQ_ENTER() \
215 local_bh_disable(); \
216 local_irq_disable(); \
217 lockdep_softirq_enter(); \
218 WARN_ON(!in_softirq());
219
220#define SOFTIRQ_EXIT() \
221 lockdep_softirq_exit(); \
222 local_irq_enable(); \
223 local_bh_enable();
224
225/*
226 * Shortcuts for lock/unlock API variants, to keep
227 * the testcases compact:
228 */
229#define L(x) spin_lock(&lock_##x)
230#define U(x) spin_unlock(&lock_##x)
231#define LU(x) L(x); U(x)
232#define SI(x) spin_lock_init(&lock_##x)
233
234#define WL(x) write_lock(&rwlock_##x)
235#define WU(x) write_unlock(&rwlock_##x)
236#define WLU(x) WL(x); WU(x)
237
238#define RL(x) read_lock(&rwlock_##x)
239#define RU(x) read_unlock(&rwlock_##x)
240#define RLU(x) RL(x); RU(x)
241#define RWI(x) rwlock_init(&rwlock_##x)
242
243#define ML(x) mutex_lock(&mutex_##x)
244#define MU(x) mutex_unlock(&mutex_##x)
245#define MI(x) mutex_init(&mutex_##x)
246
247#define RTL(x) rt_mutex_lock(&rtmutex_##x)
248#define RTU(x) rt_mutex_unlock(&rtmutex_##x)
249#define RTI(x) rt_mutex_init(&rtmutex_##x)
250
251#define WSL(x) down_write(&rwsem_##x)
252#define WSU(x) up_write(&rwsem_##x)
253
254#define RSL(x) down_read(&rwsem_##x)
255#define RSU(x) up_read(&rwsem_##x)
256#define RWSI(x) init_rwsem(&rwsem_##x)
257
258#ifndef CONFIG_DEBUG_WW_MUTEX_SLOWPATH
259#define WWAI(x) ww_acquire_init(x, &ww_lockdep)
260#else
261#define WWAI(x) do { ww_acquire_init(x, &ww_lockdep); (x)->deadlock_inject_countdown = ~0U; } while (0)
262#endif
263#define WWAD(x) ww_acquire_done(x)
264#define WWAF(x) ww_acquire_fini(x)
265
266#define WWL(x, c) ww_mutex_lock(x, c)
267#define WWT(x) ww_mutex_trylock(x, NULL)
268#define WWL1(x) ww_mutex_lock(x, NULL)
269#define WWU(x) ww_mutex_unlock(x)
270
271
272#define LOCK_UNLOCK_2(x,y) LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x)
273
274/*
275 * Generate different permutations of the same testcase, using
276 * the same basic lock-dependency/state events:
277 */
278
279#define GENERATE_TESTCASE(name) \
280 \
281static void name(void) { E(); }
282
283#define GENERATE_PERMUTATIONS_2_EVENTS(name) \
284 \
285static void name##_12(void) { E1(); E2(); } \
286static void name##_21(void) { E2(); E1(); }
287
288#define GENERATE_PERMUTATIONS_3_EVENTS(name) \
289 \
290static void name##_123(void) { E1(); E2(); E3(); } \
291static void name##_132(void) { E1(); E3(); E2(); } \
292static void name##_213(void) { E2(); E1(); E3(); } \
293static void name##_231(void) { E2(); E3(); E1(); } \
294static void name##_312(void) { E3(); E1(); E2(); } \
295static void name##_321(void) { E3(); E2(); E1(); }
296
297/*
298 * AA deadlock:
299 */
300
301#define E() \
302 \
303 LOCK(X1); \
304 LOCK(X2); /* this one should fail */
305
306/*
307 * 6 testcases:
308 */
309#include "locking-selftest-spin.h"
310GENERATE_TESTCASE(AA_spin)
311#include "locking-selftest-wlock.h"
312GENERATE_TESTCASE(AA_wlock)
313#include "locking-selftest-rlock.h"
314GENERATE_TESTCASE(AA_rlock)
315#include "locking-selftest-mutex.h"
316GENERATE_TESTCASE(AA_mutex)
317#include "locking-selftest-wsem.h"
318GENERATE_TESTCASE(AA_wsem)
319#include "locking-selftest-rsem.h"
320GENERATE_TESTCASE(AA_rsem)
321
322#ifdef CONFIG_RT_MUTEXES
323#include "locking-selftest-rtmutex.h"
324GENERATE_TESTCASE(AA_rtmutex);
325#endif
326
327#undef E
328
329/*
330 * Special-case for read-locking, they are
331 * allowed to recurse on the same lock class:
332 */
333static void rlock_AA1(void)
334{
335 RL(X1);
336 RL(X1); // this one should NOT fail
337}
338
339static void rlock_AA1B(void)
340{
341 RL(X1);
342 RL(X2); // this one should NOT fail
343}
344
345static void rsem_AA1(void)
346{
347 RSL(X1);
348 RSL(X1); // this one should fail
349}
350
351static void rsem_AA1B(void)
352{
353 RSL(X1);
354 RSL(X2); // this one should fail
355}
356/*
357 * The mixing of read and write locks is not allowed:
358 */
359static void rlock_AA2(void)
360{
361 RL(X1);
362 WL(X2); // this one should fail
363}
364
365static void rsem_AA2(void)
366{
367 RSL(X1);
368 WSL(X2); // this one should fail
369}
370
371static void rlock_AA3(void)
372{
373 WL(X1);
374 RL(X2); // this one should fail
375}
376
377static void rsem_AA3(void)
378{
379 WSL(X1);
380 RSL(X2); // this one should fail
381}
382
383/*
384 * read_lock(A)
385 * spin_lock(B)
386 * spin_lock(B)
387 * write_lock(A)
388 */
389static void rlock_ABBA1(void)
390{
391 RL(X1);
392 L(Y1);
393 U(Y1);
394 RU(X1);
395
396 L(Y1);
397 WL(X1);
398 WU(X1);
399 U(Y1); // should fail
400}
401
402static void rwsem_ABBA1(void)
403{
404 RSL(X1);
405 ML(Y1);
406 MU(Y1);
407 RSU(X1);
408
409 ML(Y1);
410 WSL(X1);
411 WSU(X1);
412 MU(Y1); // should fail
413}
414
415/*
416 * read_lock(A)
417 * spin_lock(B)
418 * spin_lock(B)
419 * write_lock(A)
420 *
421 * This test case is aimed at poking whether the chain cache prevents us from
422 * detecting a read-lock/lock-write deadlock: if the chain cache doesn't differ
423 * read/write locks, the following case may happen
424 *
425 * { read_lock(A)->lock(B) dependency exists }
426 *
427 * P0:
428 * lock(B);
429 * read_lock(A);
430 *
431 * { Not a deadlock, B -> A is added in the chain cache }
432 *
433 * P1:
434 * lock(B);
435 * write_lock(A);
436 *
437 * { B->A found in chain cache, not reported as a deadlock }
438 *
439 */
440static void rlock_chaincache_ABBA1(void)
441{
442 RL(X1);
443 L(Y1);
444 U(Y1);
445 RU(X1);
446
447 L(Y1);
448 RL(X1);
449 RU(X1);
450 U(Y1);
451
452 L(Y1);
453 WL(X1);
454 WU(X1);
455 U(Y1); // should fail
456}
457
458/*
459 * read_lock(A)
460 * spin_lock(B)
461 * spin_lock(B)
462 * read_lock(A)
463 */
464static void rlock_ABBA2(void)
465{
466 RL(X1);
467 L(Y1);
468 U(Y1);
469 RU(X1);
470
471 L(Y1);
472 RL(X1);
473 RU(X1);
474 U(Y1); // should NOT fail
475}
476
477static void rwsem_ABBA2(void)
478{
479 RSL(X1);
480 ML(Y1);
481 MU(Y1);
482 RSU(X1);
483
484 ML(Y1);
485 RSL(X1);
486 RSU(X1);
487 MU(Y1); // should fail
488}
489
490
491/*
492 * write_lock(A)
493 * spin_lock(B)
494 * spin_lock(B)
495 * write_lock(A)
496 */
497static void rlock_ABBA3(void)
498{
499 WL(X1);
500 L(Y1);
501 U(Y1);
502 WU(X1);
503
504 L(Y1);
505 WL(X1);
506 WU(X1);
507 U(Y1); // should fail
508}
509
510static void rwsem_ABBA3(void)
511{
512 WSL(X1);
513 ML(Y1);
514 MU(Y1);
515 WSU(X1);
516
517 ML(Y1);
518 WSL(X1);
519 WSU(X1);
520 MU(Y1); // should fail
521}
522
523/*
524 * ABBA deadlock:
525 */
526
527#define E() \
528 \
529 LOCK_UNLOCK_2(A, B); \
530 LOCK_UNLOCK_2(B, A); /* fail */
531
532/*
533 * 6 testcases:
534 */
535#include "locking-selftest-spin.h"
536GENERATE_TESTCASE(ABBA_spin)
537#include "locking-selftest-wlock.h"
538GENERATE_TESTCASE(ABBA_wlock)
539#include "locking-selftest-rlock.h"
540GENERATE_TESTCASE(ABBA_rlock)
541#include "locking-selftest-mutex.h"
542GENERATE_TESTCASE(ABBA_mutex)
543#include "locking-selftest-wsem.h"
544GENERATE_TESTCASE(ABBA_wsem)
545#include "locking-selftest-rsem.h"
546GENERATE_TESTCASE(ABBA_rsem)
547
548#ifdef CONFIG_RT_MUTEXES
549#include "locking-selftest-rtmutex.h"
550GENERATE_TESTCASE(ABBA_rtmutex);
551#endif
552
553#undef E
554
555/*
556 * AB BC CA deadlock:
557 */
558
559#define E() \
560 \
561 LOCK_UNLOCK_2(A, B); \
562 LOCK_UNLOCK_2(B, C); \
563 LOCK_UNLOCK_2(C, A); /* fail */
564
565/*
566 * 6 testcases:
567 */
568#include "locking-selftest-spin.h"
569GENERATE_TESTCASE(ABBCCA_spin)
570#include "locking-selftest-wlock.h"
571GENERATE_TESTCASE(ABBCCA_wlock)
572#include "locking-selftest-rlock.h"
573GENERATE_TESTCASE(ABBCCA_rlock)
574#include "locking-selftest-mutex.h"
575GENERATE_TESTCASE(ABBCCA_mutex)
576#include "locking-selftest-wsem.h"
577GENERATE_TESTCASE(ABBCCA_wsem)
578#include "locking-selftest-rsem.h"
579GENERATE_TESTCASE(ABBCCA_rsem)
580
581#ifdef CONFIG_RT_MUTEXES
582#include "locking-selftest-rtmutex.h"
583GENERATE_TESTCASE(ABBCCA_rtmutex);
584#endif
585
586#undef E
587
588/*
589 * AB CA BC deadlock:
590 */
591
592#define E() \
593 \
594 LOCK_UNLOCK_2(A, B); \
595 LOCK_UNLOCK_2(C, A); \
596 LOCK_UNLOCK_2(B, C); /* fail */
597
598/*
599 * 6 testcases:
600 */
601#include "locking-selftest-spin.h"
602GENERATE_TESTCASE(ABCABC_spin)
603#include "locking-selftest-wlock.h"
604GENERATE_TESTCASE(ABCABC_wlock)
605#include "locking-selftest-rlock.h"
606GENERATE_TESTCASE(ABCABC_rlock)
607#include "locking-selftest-mutex.h"
608GENERATE_TESTCASE(ABCABC_mutex)
609#include "locking-selftest-wsem.h"
610GENERATE_TESTCASE(ABCABC_wsem)
611#include "locking-selftest-rsem.h"
612GENERATE_TESTCASE(ABCABC_rsem)
613
614#ifdef CONFIG_RT_MUTEXES
615#include "locking-selftest-rtmutex.h"
616GENERATE_TESTCASE(ABCABC_rtmutex);
617#endif
618
619#undef E
620
621/*
622 * AB BC CD DA deadlock:
623 */
624
625#define E() \
626 \
627 LOCK_UNLOCK_2(A, B); \
628 LOCK_UNLOCK_2(B, C); \
629 LOCK_UNLOCK_2(C, D); \
630 LOCK_UNLOCK_2(D, A); /* fail */
631
632/*
633 * 6 testcases:
634 */
635#include "locking-selftest-spin.h"
636GENERATE_TESTCASE(ABBCCDDA_spin)
637#include "locking-selftest-wlock.h"
638GENERATE_TESTCASE(ABBCCDDA_wlock)
639#include "locking-selftest-rlock.h"
640GENERATE_TESTCASE(ABBCCDDA_rlock)
641#include "locking-selftest-mutex.h"
642GENERATE_TESTCASE(ABBCCDDA_mutex)
643#include "locking-selftest-wsem.h"
644GENERATE_TESTCASE(ABBCCDDA_wsem)
645#include "locking-selftest-rsem.h"
646GENERATE_TESTCASE(ABBCCDDA_rsem)
647
648#ifdef CONFIG_RT_MUTEXES
649#include "locking-selftest-rtmutex.h"
650GENERATE_TESTCASE(ABBCCDDA_rtmutex);
651#endif
652
653#undef E
654
655/*
656 * AB CD BD DA deadlock:
657 */
658#define E() \
659 \
660 LOCK_UNLOCK_2(A, B); \
661 LOCK_UNLOCK_2(C, D); \
662 LOCK_UNLOCK_2(B, D); \
663 LOCK_UNLOCK_2(D, A); /* fail */
664
665/*
666 * 6 testcases:
667 */
668#include "locking-selftest-spin.h"
669GENERATE_TESTCASE(ABCDBDDA_spin)
670#include "locking-selftest-wlock.h"
671GENERATE_TESTCASE(ABCDBDDA_wlock)
672#include "locking-selftest-rlock.h"
673GENERATE_TESTCASE(ABCDBDDA_rlock)
674#include "locking-selftest-mutex.h"
675GENERATE_TESTCASE(ABCDBDDA_mutex)
676#include "locking-selftest-wsem.h"
677GENERATE_TESTCASE(ABCDBDDA_wsem)
678#include "locking-selftest-rsem.h"
679GENERATE_TESTCASE(ABCDBDDA_rsem)
680
681#ifdef CONFIG_RT_MUTEXES
682#include "locking-selftest-rtmutex.h"
683GENERATE_TESTCASE(ABCDBDDA_rtmutex);
684#endif
685
686#undef E
687
688/*
689 * AB CD BC DA deadlock:
690 */
691#define E() \
692 \
693 LOCK_UNLOCK_2(A, B); \
694 LOCK_UNLOCK_2(C, D); \
695 LOCK_UNLOCK_2(B, C); \
696 LOCK_UNLOCK_2(D, A); /* fail */
697
698/*
699 * 6 testcases:
700 */
701#include "locking-selftest-spin.h"
702GENERATE_TESTCASE(ABCDBCDA_spin)
703#include "locking-selftest-wlock.h"
704GENERATE_TESTCASE(ABCDBCDA_wlock)
705#include "locking-selftest-rlock.h"
706GENERATE_TESTCASE(ABCDBCDA_rlock)
707#include "locking-selftest-mutex.h"
708GENERATE_TESTCASE(ABCDBCDA_mutex)
709#include "locking-selftest-wsem.h"
710GENERATE_TESTCASE(ABCDBCDA_wsem)
711#include "locking-selftest-rsem.h"
712GENERATE_TESTCASE(ABCDBCDA_rsem)
713
714#ifdef CONFIG_RT_MUTEXES
715#include "locking-selftest-rtmutex.h"
716GENERATE_TESTCASE(ABCDBCDA_rtmutex);
717#endif
718
719#undef E
720
721#ifdef CONFIG_PREEMPT_RT
722# define RT_PREPARE_DBL_UNLOCK() { migrate_disable(); rcu_read_lock(); }
723#else
724# define RT_PREPARE_DBL_UNLOCK()
725#endif
726/*
727 * Double unlock:
728 */
729#define E() \
730 \
731 LOCK(A); \
732 RT_PREPARE_DBL_UNLOCK(); \
733 UNLOCK(A); \
734 UNLOCK(A); /* fail */
735
736/*
737 * 6 testcases:
738 */
739#include "locking-selftest-spin.h"
740GENERATE_TESTCASE(double_unlock_spin)
741#include "locking-selftest-wlock.h"
742GENERATE_TESTCASE(double_unlock_wlock)
743#include "locking-selftest-rlock.h"
744GENERATE_TESTCASE(double_unlock_rlock)
745#include "locking-selftest-mutex.h"
746GENERATE_TESTCASE(double_unlock_mutex)
747#include "locking-selftest-wsem.h"
748GENERATE_TESTCASE(double_unlock_wsem)
749#include "locking-selftest-rsem.h"
750GENERATE_TESTCASE(double_unlock_rsem)
751
752#ifdef CONFIG_RT_MUTEXES
753#include "locking-selftest-rtmutex.h"
754GENERATE_TESTCASE(double_unlock_rtmutex);
755#endif
756
757#undef E
758
759/*
760 * initializing a held lock:
761 */
762#define E() \
763 \
764 LOCK(A); \
765 INIT(A); /* fail */
766
767/*
768 * 6 testcases:
769 */
770#include "locking-selftest-spin.h"
771GENERATE_TESTCASE(init_held_spin)
772#include "locking-selftest-wlock.h"
773GENERATE_TESTCASE(init_held_wlock)
774#include "locking-selftest-rlock.h"
775GENERATE_TESTCASE(init_held_rlock)
776#include "locking-selftest-mutex.h"
777GENERATE_TESTCASE(init_held_mutex)
778#include "locking-selftest-wsem.h"
779GENERATE_TESTCASE(init_held_wsem)
780#include "locking-selftest-rsem.h"
781GENERATE_TESTCASE(init_held_rsem)
782
783#ifdef CONFIG_RT_MUTEXES
784#include "locking-selftest-rtmutex.h"
785GENERATE_TESTCASE(init_held_rtmutex);
786#endif
787
788#undef E
789
790/*
791 * locking an irq-safe lock with irqs enabled:
792 */
793#define E1() \
794 \
795 IRQ_ENTER(); \
796 LOCK(A); \
797 UNLOCK(A); \
798 IRQ_EXIT();
799
800#define E2() \
801 \
802 LOCK(A); \
803 UNLOCK(A);
804
805/*
806 * Generate 24 testcases:
807 */
808#include "locking-selftest-spin-hardirq.h"
809GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin)
810
811#include "locking-selftest-rlock-hardirq.h"
812GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock)
813
814#include "locking-selftest-wlock-hardirq.h"
815GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock)
816
817#ifndef CONFIG_PREEMPT_RT
818#include "locking-selftest-spin-softirq.h"
819GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin)
820
821#include "locking-selftest-rlock-softirq.h"
822GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock)
823
824#include "locking-selftest-wlock-softirq.h"
825GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock)
826#endif
827
828#undef E1
829#undef E2
830
831#ifndef CONFIG_PREEMPT_RT
832/*
833 * Enabling hardirqs with a softirq-safe lock held:
834 */
835#define E1() \
836 \
837 SOFTIRQ_ENTER(); \
838 LOCK(A); \
839 UNLOCK(A); \
840 SOFTIRQ_EXIT();
841
842#define E2() \
843 \
844 HARDIRQ_DISABLE(); \
845 LOCK(A); \
846 HARDIRQ_ENABLE(); \
847 UNLOCK(A);
848
849/*
850 * Generate 12 testcases:
851 */
852#include "locking-selftest-spin.h"
853GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin)
854
855#include "locking-selftest-wlock.h"
856GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock)
857
858#include "locking-selftest-rlock.h"
859GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock)
860
861#undef E1
862#undef E2
863
864#endif
865
866/*
867 * Enabling irqs with an irq-safe lock held:
868 */
869#define E1() \
870 \
871 IRQ_ENTER(); \
872 LOCK(A); \
873 UNLOCK(A); \
874 IRQ_EXIT();
875
876#define E2() \
877 \
878 IRQ_DISABLE(); \
879 LOCK(A); \
880 IRQ_ENABLE(); \
881 UNLOCK(A);
882
883/*
884 * Generate 24 testcases:
885 */
886#include "locking-selftest-spin-hardirq.h"
887GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin)
888
889#include "locking-selftest-rlock-hardirq.h"
890GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock)
891
892#include "locking-selftest-wlock-hardirq.h"
893GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock)
894
895#ifndef CONFIG_PREEMPT_RT
896#include "locking-selftest-spin-softirq.h"
897GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin)
898
899#include "locking-selftest-rlock-softirq.h"
900GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock)
901
902#include "locking-selftest-wlock-softirq.h"
903GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)
904#endif
905
906#undef E1
907#undef E2
908
909/*
910 * Acquiring a irq-unsafe lock while holding an irq-safe-lock:
911 */
912#define E1() \
913 \
914 LOCK(A); \
915 LOCK(B); \
916 UNLOCK(B); \
917 UNLOCK(A); \
918
919#define E2() \
920 \
921 LOCK(B); \
922 UNLOCK(B);
923
924#define E3() \
925 \
926 IRQ_ENTER(); \
927 LOCK(A); \
928 UNLOCK(A); \
929 IRQ_EXIT();
930
931/*
932 * Generate 36 testcases:
933 */
934#include "locking-selftest-spin-hardirq.h"
935GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin)
936
937#include "locking-selftest-rlock-hardirq.h"
938GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock)
939
940#include "locking-selftest-wlock-hardirq.h"
941GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock)
942
943#ifndef CONFIG_PREEMPT_RT
944#include "locking-selftest-spin-softirq.h"
945GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin)
946
947#include "locking-selftest-rlock-softirq.h"
948GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock)
949
950#include "locking-selftest-wlock-softirq.h"
951GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)
952#endif
953
954#undef E1
955#undef E2
956#undef E3
957
958/*
959 * If a lock turns into softirq-safe, but earlier it took
960 * a softirq-unsafe lock:
961 */
962
963#define E1() \
964 IRQ_DISABLE(); \
965 LOCK(A); \
966 LOCK(B); \
967 UNLOCK(B); \
968 UNLOCK(A); \
969 IRQ_ENABLE();
970
971#define E2() \
972 LOCK(B); \
973 UNLOCK(B);
974
975#define E3() \
976 IRQ_ENTER(); \
977 LOCK(A); \
978 UNLOCK(A); \
979 IRQ_EXIT();
980
981/*
982 * Generate 36 testcases:
983 */
984#include "locking-selftest-spin-hardirq.h"
985GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin)
986
987#include "locking-selftest-rlock-hardirq.h"
988GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock)
989
990#include "locking-selftest-wlock-hardirq.h"
991GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock)
992
993#ifndef CONFIG_PREEMPT_RT
994#include "locking-selftest-spin-softirq.h"
995GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin)
996
997#include "locking-selftest-rlock-softirq.h"
998GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock)
999
1000#include "locking-selftest-wlock-softirq.h"
1001GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock)
1002#endif
1003
1004#undef E1
1005#undef E2
1006#undef E3
1007
1008/*
1009 * read-lock / write-lock irq inversion.
1010 *
1011 * Deadlock scenario:
1012 *
1013 * CPU#1 is at #1, i.e. it has write-locked A, but has not
1014 * taken B yet.
1015 *
1016 * CPU#2 is at #2, i.e. it has locked B.
1017 *
1018 * Hardirq hits CPU#2 at point #2 and is trying to read-lock A.
1019 *
1020 * The deadlock occurs because CPU#1 will spin on B, and CPU#2
1021 * will spin on A.
1022 */
1023
1024#define E1() \
1025 \
1026 IRQ_DISABLE(); \
1027 WL(A); \
1028 LOCK(B); \
1029 UNLOCK(B); \
1030 WU(A); \
1031 IRQ_ENABLE();
1032
1033#define E2() \
1034 \
1035 LOCK(B); \
1036 UNLOCK(B);
1037
1038#define E3() \
1039 \
1040 IRQ_ENTER(); \
1041 RL(A); \
1042 RU(A); \
1043 IRQ_EXIT();
1044
1045/*
1046 * Generate 36 testcases:
1047 */
1048#include "locking-selftest-spin-hardirq.h"
1049GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin)
1050
1051#include "locking-selftest-rlock-hardirq.h"
1052GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock)
1053
1054#include "locking-selftest-wlock-hardirq.h"
1055GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock)
1056
1057#ifndef CONFIG_PREEMPT_RT
1058#include "locking-selftest-spin-softirq.h"
1059GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin)
1060
1061#include "locking-selftest-rlock-softirq.h"
1062GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock)
1063
1064#include "locking-selftest-wlock-softirq.h"
1065GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock)
1066#endif
1067
1068#undef E1
1069#undef E2
1070#undef E3
1071
1072/*
1073 * write-read / write-read / write-read deadlock even if read is recursive
1074 */
1075
1076#define E1() \
1077 \
1078 WL(X1); \
1079 RL(Y1); \
1080 RU(Y1); \
1081 WU(X1);
1082
1083#define E2() \
1084 \
1085 WL(Y1); \
1086 RL(Z1); \
1087 RU(Z1); \
1088 WU(Y1);
1089
1090#define E3() \
1091 \
1092 WL(Z1); \
1093 RL(X1); \
1094 RU(X1); \
1095 WU(Z1);
1096
1097#include "locking-selftest-rlock.h"
1098GENERATE_PERMUTATIONS_3_EVENTS(W1R2_W2R3_W3R1)
1099
1100#undef E1
1101#undef E2
1102#undef E3
1103
1104/*
1105 * write-write / read-read / write-read deadlock even if read is recursive
1106 */
1107
1108#define E1() \
1109 \
1110 WL(X1); \
1111 WL(Y1); \
1112 WU(Y1); \
1113 WU(X1);
1114
1115#define E2() \
1116 \
1117 RL(Y1); \
1118 RL(Z1); \
1119 RU(Z1); \
1120 RU(Y1);
1121
1122#define E3() \
1123 \
1124 WL(Z1); \
1125 RL(X1); \
1126 RU(X1); \
1127 WU(Z1);
1128
1129#include "locking-selftest-rlock.h"
1130GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_W3R1)
1131
1132#undef E1
1133#undef E2
1134#undef E3
1135
1136/*
1137 * write-write / read-read / read-write is not deadlock when read is recursive
1138 */
1139
1140#define E1() \
1141 \
1142 WL(X1); \
1143 WL(Y1); \
1144 WU(Y1); \
1145 WU(X1);
1146
1147#define E2() \
1148 \
1149 RL(Y1); \
1150 RL(Z1); \
1151 RU(Z1); \
1152 RU(Y1);
1153
1154#define E3() \
1155 \
1156 RL(Z1); \
1157 WL(X1); \
1158 WU(X1); \
1159 RU(Z1);
1160
1161#include "locking-selftest-rlock.h"
1162GENERATE_PERMUTATIONS_3_EVENTS(W1R2_R2R3_W3W1)
1163
1164#undef E1
1165#undef E2
1166#undef E3
1167
1168/*
1169 * write-read / read-read / write-write is not deadlock when read is recursive
1170 */
1171
1172#define E1() \
1173 \
1174 WL(X1); \
1175 RL(Y1); \
1176 RU(Y1); \
1177 WU(X1);
1178
1179#define E2() \
1180 \
1181 RL(Y1); \
1182 RL(Z1); \
1183 RU(Z1); \
1184 RU(Y1);
1185
1186#define E3() \
1187 \
1188 WL(Z1); \
1189 WL(X1); \
1190 WU(X1); \
1191 WU(Z1);
1192
1193#include "locking-selftest-rlock.h"
1194GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_R3W1)
1195
1196#undef E1
1197#undef E2
1198#undef E3
1199/*
1200 * read-lock / write-lock recursion that is actually safe.
1201 */
1202
1203#define E1() \
1204 \
1205 IRQ_DISABLE(); \
1206 WL(A); \
1207 WU(A); \
1208 IRQ_ENABLE();
1209
1210#define E2() \
1211 \
1212 RL(A); \
1213 RU(A); \
1214
1215#define E3() \
1216 \
1217 IRQ_ENTER(); \
1218 LOCK(A); \
1219 L(B); \
1220 U(B); \
1221 UNLOCK(A); \
1222 IRQ_EXIT();
1223
1224/*
1225 * Generate 24 testcases:
1226 */
1227#include "locking-selftest-hardirq.h"
1228#include "locking-selftest-rlock.h"
1229GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_rlock)
1230
1231#include "locking-selftest-wlock.h"
1232GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_wlock)
1233
1234#ifndef CONFIG_PREEMPT_RT
1235#include "locking-selftest-softirq.h"
1236#include "locking-selftest-rlock.h"
1237GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_rlock)
1238
1239#include "locking-selftest-wlock.h"
1240GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_wlock)
1241#endif
1242
1243#undef E1
1244#undef E2
1245#undef E3
1246
1247/*
1248 * read-lock / write-lock recursion that is unsafe.
1249 */
1250
1251#define E1() \
1252 \
1253 IRQ_DISABLE(); \
1254 L(B); \
1255 LOCK(A); \
1256 UNLOCK(A); \
1257 U(B); \
1258 IRQ_ENABLE();
1259
1260#define E2() \
1261 \
1262 RL(A); \
1263 RU(A); \
1264
1265#define E3() \
1266 \
1267 IRQ_ENTER(); \
1268 L(B); \
1269 U(B); \
1270 IRQ_EXIT();
1271
1272/*
1273 * Generate 24 testcases:
1274 */
1275#include "locking-selftest-hardirq.h"
1276#include "locking-selftest-rlock.h"
1277GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_rlock)
1278
1279#include "locking-selftest-wlock.h"
1280GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_wlock)
1281
1282#ifndef CONFIG_PREEMPT_RT
1283#include "locking-selftest-softirq.h"
1284#include "locking-selftest-rlock.h"
1285GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_rlock)
1286
1287#include "locking-selftest-wlock.h"
1288GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_wlock)
1289#endif
1290
1291#undef E1
1292#undef E2
1293#undef E3
1294/*
1295 * read-lock / write-lock recursion that is unsafe.
1296 *
1297 * A is a ENABLED_*_READ lock
1298 * B is a USED_IN_*_READ lock
1299 *
1300 * read_lock(A);
1301 * write_lock(B);
1302 * <interrupt>
1303 * read_lock(B);
1304 * write_lock(A); // if this one is read_lock(), no deadlock
1305 */
1306
1307#define E1() \
1308 \
1309 IRQ_DISABLE(); \
1310 WL(B); \
1311 LOCK(A); \
1312 UNLOCK(A); \
1313 WU(B); \
1314 IRQ_ENABLE();
1315
1316#define E2() \
1317 \
1318 RL(A); \
1319 RU(A); \
1320
1321#define E3() \
1322 \
1323 IRQ_ENTER(); \
1324 RL(B); \
1325 RU(B); \
1326 IRQ_EXIT();
1327
1328/*
1329 * Generate 24 testcases:
1330 */
1331#include "locking-selftest-hardirq.h"
1332#include "locking-selftest-rlock.h"
1333GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_rlock)
1334
1335#include "locking-selftest-wlock.h"
1336GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_wlock)
1337
1338#ifndef CONFIG_PREEMPT_RT
1339#include "locking-selftest-softirq.h"
1340#include "locking-selftest-rlock.h"
1341GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_rlock)
1342
1343#include "locking-selftest-wlock.h"
1344GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_wlock)
1345#endif
1346
1347#ifdef CONFIG_DEBUG_LOCK_ALLOC
1348# define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map)
1349# define I_RAW_SPINLOCK(x) lockdep_reset_lock(&raw_lock_##x.dep_map)
1350# define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map)
1351# define I_MUTEX(x) lockdep_reset_lock(&mutex_##x.dep_map)
1352# define I_RWSEM(x) lockdep_reset_lock(&rwsem_##x.dep_map)
1353# define I_WW(x) lockdep_reset_lock(&x.dep_map)
1354# define I_LOCAL_LOCK(x) lockdep_reset_lock(this_cpu_ptr(&local_##x.dep_map))
1355#ifdef CONFIG_RT_MUTEXES
1356# define I_RTMUTEX(x) lockdep_reset_lock(&rtmutex_##x.dep_map)
1357#endif
1358#else
1359# define I_SPINLOCK(x)
1360# define I_RAW_SPINLOCK(x)
1361# define I_RWLOCK(x)
1362# define I_MUTEX(x)
1363# define I_RWSEM(x)
1364# define I_WW(x)
1365# define I_LOCAL_LOCK(x)
1366#endif
1367
1368#ifndef I_RTMUTEX
1369# define I_RTMUTEX(x)
1370#endif
1371
1372#ifdef CONFIG_RT_MUTEXES
1373#define I2_RTMUTEX(x) rt_mutex_init(&rtmutex_##x)
1374#else
1375#define I2_RTMUTEX(x)
1376#endif
1377
1378#define I1(x) \
1379 do { \
1380 I_SPINLOCK(x); \
1381 I_RWLOCK(x); \
1382 I_MUTEX(x); \
1383 I_RWSEM(x); \
1384 I_RTMUTEX(x); \
1385 } while (0)
1386
1387#define I2(x) \
1388 do { \
1389 spin_lock_init(&lock_##x); \
1390 rwlock_init(&rwlock_##x); \
1391 mutex_init(&mutex_##x); \
1392 init_rwsem(&rwsem_##x); \
1393 I2_RTMUTEX(x); \
1394 } while (0)
1395
1396static void reset_locks(void)
1397{
1398 local_irq_disable();
1399 lockdep_free_key_range(&ww_lockdep.acquire_key, 1);
1400 lockdep_free_key_range(&ww_lockdep.mutex_key, 1);
1401
1402 I1(A); I1(B); I1(C); I1(D);
1403 I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2);
1404 I_WW(t); I_WW(t2); I_WW(o.base); I_WW(o2.base); I_WW(o3.base);
1405 I_RAW_SPINLOCK(A); I_RAW_SPINLOCK(B);
1406 I_LOCAL_LOCK(A);
1407
1408 lockdep_reset();
1409
1410 I2(A); I2(B); I2(C); I2(D);
1411 init_shared_classes();
1412 raw_spin_lock_init(&raw_lock_A);
1413 raw_spin_lock_init(&raw_lock_B);
1414 local_lock_init(this_cpu_ptr(&local_A));
1415
1416 ww_mutex_init(&o, &ww_lockdep); ww_mutex_init(&o2, &ww_lockdep); ww_mutex_init(&o3, &ww_lockdep);
1417 memset(&t, 0, sizeof(t)); memset(&t2, 0, sizeof(t2));
1418 memset(&ww_lockdep.acquire_key, 0, sizeof(ww_lockdep.acquire_key));
1419 memset(&ww_lockdep.mutex_key, 0, sizeof(ww_lockdep.mutex_key));
1420 local_irq_enable();
1421}
1422
1423#undef I
1424
1425static int testcase_total;
1426static int testcase_successes;
1427static int expected_testcase_failures;
1428static int unexpected_testcase_failures;
1429
1430static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
1431{
1432 long saved_preempt_count = preempt_count();
1433#ifdef CONFIG_PREEMPT_RT
1434 int saved_mgd_count = current->migration_disabled;
1435 int saved_rcu_count = current->rcu_read_lock_nesting;
1436 int saved_sched_rt_mutex = current->sched_rt_mutex;
1437#endif
1438
1439 WARN_ON(irqs_disabled());
1440
1441 debug_locks_silent = !(debug_locks_verbose & lockclass_mask);
1442
1443 testcase_fn();
1444 /*
1445 * Filter out expected failures:
1446 */
1447#ifndef CONFIG_PROVE_LOCKING
1448 if (expected == FAILURE && debug_locks) {
1449 expected_testcase_failures++;
1450 pr_cont("failed|");
1451 }
1452 else
1453#endif
1454 if (debug_locks != expected) {
1455 unexpected_testcase_failures++;
1456 pr_cont("FAILED|");
1457 } else {
1458 testcase_successes++;
1459 pr_cont(" ok |");
1460 }
1461 testcase_total++;
1462
1463 if (debug_locks_verbose & lockclass_mask)
1464 pr_cont(" lockclass mask: %x, debug_locks: %d, expected: %d\n",
1465 lockclass_mask, debug_locks, expected);
1466 /*
1467 * Some tests (e.g. double-unlock) might corrupt the preemption
1468 * count, so restore it:
1469 */
1470 preempt_count_set(saved_preempt_count);
1471
1472#ifdef CONFIG_PREEMPT_RT
1473 current->sched_rt_mutex = saved_sched_rt_mutex;
1474
1475 while (current->migration_disabled > saved_mgd_count)
1476 migrate_enable();
1477
1478 while (current->rcu_read_lock_nesting > saved_rcu_count)
1479 rcu_read_unlock();
1480 WARN_ON_ONCE(current->rcu_read_lock_nesting < saved_rcu_count);
1481#endif
1482
1483#ifdef CONFIG_TRACE_IRQFLAGS
1484 if (softirq_count())
1485 current->softirqs_enabled = 0;
1486 else
1487 current->softirqs_enabled = 1;
1488#endif
1489
1490 reset_locks();
1491}
1492
1493#ifdef CONFIG_RT_MUTEXES
1494#define dotest_rt(fn, e, m) dotest((fn), (e), (m))
1495#else
1496#define dotest_rt(fn, e, m)
1497#endif
1498
1499static inline void print_testname(const char *testname)
1500{
1501 printk("%33s:", testname);
1502}
1503
1504#define DO_TESTCASE_1(desc, name, nr) \
1505 print_testname(desc"/"#nr); \
1506 dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
1507 pr_cont("\n");
1508
1509#define DO_TESTCASE_1B(desc, name, nr) \
1510 print_testname(desc"/"#nr); \
1511 dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
1512 pr_cont("\n");
1513
1514#define DO_TESTCASE_1RR(desc, name, nr) \
1515 print_testname(desc"/"#nr); \
1516 pr_cont(" |"); \
1517 dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
1518 pr_cont("\n");
1519
1520#define DO_TESTCASE_1RRB(desc, name, nr) \
1521 print_testname(desc"/"#nr); \
1522 pr_cont(" |"); \
1523 dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
1524 pr_cont("\n");
1525
1526
1527#define DO_TESTCASE_3(desc, name, nr) \
1528 print_testname(desc"/"#nr); \
1529 dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \
1530 dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
1531 dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
1532 pr_cont("\n");
1533
1534#define DO_TESTCASE_3RW(desc, name, nr) \
1535 print_testname(desc"/"#nr); \
1536 dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\
1537 dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
1538 dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
1539 pr_cont("\n");
1540
1541#define DO_TESTCASE_2RW(desc, name, nr) \
1542 print_testname(desc"/"#nr); \
1543 pr_cont(" |"); \
1544 dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
1545 dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
1546 pr_cont("\n");
1547
1548#define DO_TESTCASE_2x2RW(desc, name, nr) \
1549 DO_TESTCASE_2RW("hard-"desc, name##_hard, nr) \
1550 NON_RT(DO_TESTCASE_2RW("soft-"desc, name##_soft, nr)) \
1551
1552#define DO_TESTCASE_6x2x2RW(desc, name) \
1553 DO_TESTCASE_2x2RW(desc, name, 123); \
1554 DO_TESTCASE_2x2RW(desc, name, 132); \
1555 DO_TESTCASE_2x2RW(desc, name, 213); \
1556 DO_TESTCASE_2x2RW(desc, name, 231); \
1557 DO_TESTCASE_2x2RW(desc, name, 312); \
1558 DO_TESTCASE_2x2RW(desc, name, 321);
1559
1560#define DO_TESTCASE_6(desc, name) \
1561 print_testname(desc); \
1562 dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \
1563 dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \
1564 dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK); \
1565 dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \
1566 dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \
1567 dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \
1568 dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \
1569 pr_cont("\n");
1570
1571#define DO_TESTCASE_6_SUCCESS(desc, name) \
1572 print_testname(desc); \
1573 dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN); \
1574 dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK); \
1575 dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \
1576 dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX); \
1577 dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM); \
1578 dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM); \
1579 dotest_rt(name##_rtmutex, SUCCESS, LOCKTYPE_RTMUTEX); \
1580 pr_cont("\n");
1581
1582/*
1583 * 'read' variant: rlocks must not trigger.
1584 */
1585#define DO_TESTCASE_6R(desc, name) \
1586 print_testname(desc); \
1587 dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \
1588 dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \
1589 dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \
1590 dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \
1591 dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \
1592 dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \
1593 dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \
1594 pr_cont("\n");
1595
1596#define DO_TESTCASE_2I(desc, name, nr) \
1597 DO_TESTCASE_1("hard-"desc, name##_hard, nr); \
1598 NON_RT(DO_TESTCASE_1("soft-"desc, name##_soft, nr));
1599
1600#define DO_TESTCASE_2IB(desc, name, nr) \
1601 DO_TESTCASE_1B("hard-"desc, name##_hard, nr); \
1602 NON_RT(DO_TESTCASE_1B("soft-"desc, name##_soft, nr));
1603
1604#define DO_TESTCASE_6I(desc, name, nr) \
1605 DO_TESTCASE_3("hard-"desc, name##_hard, nr); \
1606 NON_RT(DO_TESTCASE_3("soft-"desc, name##_soft, nr));
1607
1608#define DO_TESTCASE_6IRW(desc, name, nr) \
1609 DO_TESTCASE_3RW("hard-"desc, name##_hard, nr); \
1610 NON_RT(DO_TESTCASE_3RW("soft-"desc, name##_soft, nr));
1611
1612#define DO_TESTCASE_2x3(desc, name) \
1613 DO_TESTCASE_3(desc, name, 12); \
1614 DO_TESTCASE_3(desc, name, 21);
1615
1616#define DO_TESTCASE_2x6(desc, name) \
1617 DO_TESTCASE_6I(desc, name, 12); \
1618 DO_TESTCASE_6I(desc, name, 21);
1619
1620#define DO_TESTCASE_6x2(desc, name) \
1621 DO_TESTCASE_2I(desc, name, 123); \
1622 DO_TESTCASE_2I(desc, name, 132); \
1623 DO_TESTCASE_2I(desc, name, 213); \
1624 DO_TESTCASE_2I(desc, name, 231); \
1625 DO_TESTCASE_2I(desc, name, 312); \
1626 DO_TESTCASE_2I(desc, name, 321);
1627
1628#define DO_TESTCASE_6x2B(desc, name) \
1629 DO_TESTCASE_2IB(desc, name, 123); \
1630 DO_TESTCASE_2IB(desc, name, 132); \
1631 DO_TESTCASE_2IB(desc, name, 213); \
1632 DO_TESTCASE_2IB(desc, name, 231); \
1633 DO_TESTCASE_2IB(desc, name, 312); \
1634 DO_TESTCASE_2IB(desc, name, 321);
1635
1636#define DO_TESTCASE_6x1RR(desc, name) \
1637 DO_TESTCASE_1RR(desc, name, 123); \
1638 DO_TESTCASE_1RR(desc, name, 132); \
1639 DO_TESTCASE_1RR(desc, name, 213); \
1640 DO_TESTCASE_1RR(desc, name, 231); \
1641 DO_TESTCASE_1RR(desc, name, 312); \
1642 DO_TESTCASE_1RR(desc, name, 321);
1643
1644#define DO_TESTCASE_6x1RRB(desc, name) \
1645 DO_TESTCASE_1RRB(desc, name, 123); \
1646 DO_TESTCASE_1RRB(desc, name, 132); \
1647 DO_TESTCASE_1RRB(desc, name, 213); \
1648 DO_TESTCASE_1RRB(desc, name, 231); \
1649 DO_TESTCASE_1RRB(desc, name, 312); \
1650 DO_TESTCASE_1RRB(desc, name, 321);
1651
1652#define DO_TESTCASE_6x6(desc, name) \
1653 DO_TESTCASE_6I(desc, name, 123); \
1654 DO_TESTCASE_6I(desc, name, 132); \
1655 DO_TESTCASE_6I(desc, name, 213); \
1656 DO_TESTCASE_6I(desc, name, 231); \
1657 DO_TESTCASE_6I(desc, name, 312); \
1658 DO_TESTCASE_6I(desc, name, 321);
1659
1660#define DO_TESTCASE_6x6RW(desc, name) \
1661 DO_TESTCASE_6IRW(desc, name, 123); \
1662 DO_TESTCASE_6IRW(desc, name, 132); \
1663 DO_TESTCASE_6IRW(desc, name, 213); \
1664 DO_TESTCASE_6IRW(desc, name, 231); \
1665 DO_TESTCASE_6IRW(desc, name, 312); \
1666 DO_TESTCASE_6IRW(desc, name, 321);
1667
1668static void ww_test_fail_acquire(void)
1669{
1670 int ret;
1671
1672 WWAI(&t);
1673 t.stamp++;
1674
1675 ret = WWL(&o, &t);
1676
1677 if (WARN_ON(!o.ctx) ||
1678 WARN_ON(ret))
1679 return;
1680
1681 /* No lockdep test, pure API */
1682 ret = WWL(&o, &t);
1683 WARN_ON(ret != -EALREADY);
1684
1685 ret = WWT(&o);
1686 WARN_ON(ret);
1687
1688 t2 = t;
1689 t2.stamp++;
1690 ret = WWL(&o, &t2);
1691 WARN_ON(ret != -EDEADLK);
1692 WWU(&o);
1693
1694 if (WWT(&o))
1695 WWU(&o);
1696#ifdef CONFIG_DEBUG_LOCK_ALLOC
1697 else
1698 DEBUG_LOCKS_WARN_ON(1);
1699#endif
1700}
1701
1702#ifdef CONFIG_PREEMPT_RT
1703#define ww_mutex_base_lock(b) rt_mutex_lock(b)
1704#define ww_mutex_base_trylock(b) rt_mutex_trylock(b)
1705#define ww_mutex_base_lock_nest_lock(b, b2) rt_mutex_lock_nest_lock(b, b2)
1706#define ww_mutex_base_lock_interruptible(b) rt_mutex_lock_interruptible(b)
1707#define ww_mutex_base_lock_killable(b) rt_mutex_lock_killable(b)
1708#define ww_mutex_base_unlock(b) rt_mutex_unlock(b)
1709#else
1710#define ww_mutex_base_lock(b) mutex_lock(b)
1711#define ww_mutex_base_trylock(b) mutex_trylock(b)
1712#define ww_mutex_base_lock_nest_lock(b, b2) mutex_lock_nest_lock(b, b2)
1713#define ww_mutex_base_lock_interruptible(b) mutex_lock_interruptible(b)
1714#define ww_mutex_base_lock_killable(b) mutex_lock_killable(b)
1715#define ww_mutex_base_unlock(b) mutex_unlock(b)
1716#endif
1717
1718static void ww_test_normal(void)
1719{
1720 int ret;
1721
1722 /*
1723 * None of the ww_mutex codepaths should be taken in the 'normal'
1724 * mutex calls. The easiest way to verify this is by using the
1725 * normal mutex calls, and making sure o.ctx is unmodified.
1726 */
1727
1728 /* mutex_lock (and indirectly, mutex_lock_nested) */
1729 o.ctx = (void *)~0UL;
1730 ww_mutex_base_lock(&o.base);
1731 ww_mutex_base_unlock(&o.base);
1732 WARN_ON(o.ctx != (void *)~0UL);
1733
1734 /* mutex_lock_interruptible (and *_nested) */
1735 o.ctx = (void *)~0UL;
1736 ret = ww_mutex_base_lock_interruptible(&o.base);
1737 if (!ret)
1738 ww_mutex_base_unlock(&o.base);
1739 else
1740 WARN_ON(1);
1741 WARN_ON(o.ctx != (void *)~0UL);
1742
1743 /* mutex_lock_killable (and *_nested) */
1744 o.ctx = (void *)~0UL;
1745 ret = ww_mutex_base_lock_killable(&o.base);
1746 if (!ret)
1747 ww_mutex_base_unlock(&o.base);
1748 else
1749 WARN_ON(1);
1750 WARN_ON(o.ctx != (void *)~0UL);
1751
1752 /* trylock, succeeding */
1753 o.ctx = (void *)~0UL;
1754 ret = ww_mutex_base_trylock(&o.base);
1755 WARN_ON(!ret);
1756 if (ret)
1757 ww_mutex_base_unlock(&o.base);
1758 else
1759 WARN_ON(1);
1760 WARN_ON(o.ctx != (void *)~0UL);
1761
1762 /* trylock, failing */
1763 o.ctx = (void *)~0UL;
1764 ww_mutex_base_lock(&o.base);
1765 ret = ww_mutex_base_trylock(&o.base);
1766 WARN_ON(ret);
1767 ww_mutex_base_unlock(&o.base);
1768 WARN_ON(o.ctx != (void *)~0UL);
1769
1770 WWAI(&t);
1771
1772 /* nest_lock */
1773 o.ctx = (void *)~0UL;
1774 ww_mutex_base_lock_nest_lock(&o.base, &t);
1775 ww_mutex_base_unlock(&o.base);
1776 WARN_ON(o.ctx != (void *)~0UL);
1777}
1778
1779static void ww_test_two_contexts(void)
1780{
1781 WWAI(&t);
1782 WWAI(&t2);
1783}
1784
1785static void ww_test_diff_class(void)
1786{
1787 WWAI(&t);
1788#ifdef DEBUG_WW_MUTEXES
1789 t.ww_class = NULL;
1790#endif
1791 WWL(&o, &t);
1792}
1793
1794static void ww_test_context_done_twice(void)
1795{
1796 WWAI(&t);
1797 WWAD(&t);
1798 WWAD(&t);
1799 WWAF(&t);
1800}
1801
1802static void ww_test_context_unlock_twice(void)
1803{
1804 WWAI(&t);
1805 WWAD(&t);
1806 WWAF(&t);
1807 WWAF(&t);
1808}
1809
1810static void ww_test_context_fini_early(void)
1811{
1812 WWAI(&t);
1813 WWL(&o, &t);
1814 WWAD(&t);
1815 WWAF(&t);
1816}
1817
1818static void ww_test_context_lock_after_done(void)
1819{
1820 WWAI(&t);
1821 WWAD(&t);
1822 WWL(&o, &t);
1823}
1824
1825static void ww_test_object_unlock_twice(void)
1826{
1827 WWL1(&o);
1828 WWU(&o);
1829 WWU(&o);
1830}
1831
1832static void ww_test_object_lock_unbalanced(void)
1833{
1834 WWAI(&t);
1835 WWL(&o, &t);
1836 t.acquired = 0;
1837 WWU(&o);
1838 WWAF(&t);
1839}
1840
1841static void ww_test_object_lock_stale_context(void)
1842{
1843 WWAI(&t);
1844 o.ctx = &t2;
1845 WWL(&o, &t);
1846}
1847
1848static void ww_test_edeadlk_normal(void)
1849{
1850 int ret;
1851
1852 ww_mutex_base_lock(&o2.base);
1853 o2.ctx = &t2;
1854 mutex_release(&o2.base.dep_map, _THIS_IP_);
1855
1856 WWAI(&t);
1857 t2 = t;
1858 t2.stamp--;
1859
1860 ret = WWL(&o, &t);
1861 WARN_ON(ret);
1862
1863 ret = WWL(&o2, &t);
1864 WARN_ON(ret != -EDEADLK);
1865
1866 o2.ctx = NULL;
1867 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1868 ww_mutex_base_unlock(&o2.base);
1869 WWU(&o);
1870
1871 WWL(&o2, &t);
1872}
1873
1874static void ww_test_edeadlk_normal_slow(void)
1875{
1876 int ret;
1877
1878 ww_mutex_base_lock(&o2.base);
1879 mutex_release(&o2.base.dep_map, _THIS_IP_);
1880 o2.ctx = &t2;
1881
1882 WWAI(&t);
1883 t2 = t;
1884 t2.stamp--;
1885
1886 ret = WWL(&o, &t);
1887 WARN_ON(ret);
1888
1889 ret = WWL(&o2, &t);
1890 WARN_ON(ret != -EDEADLK);
1891
1892 o2.ctx = NULL;
1893 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1894 ww_mutex_base_unlock(&o2.base);
1895 WWU(&o);
1896
1897 ww_mutex_lock_slow(&o2, &t);
1898}
1899
1900static void ww_test_edeadlk_no_unlock(void)
1901{
1902 int ret;
1903
1904 ww_mutex_base_lock(&o2.base);
1905 o2.ctx = &t2;
1906 mutex_release(&o2.base.dep_map, _THIS_IP_);
1907
1908 WWAI(&t);
1909 t2 = t;
1910 t2.stamp--;
1911
1912 ret = WWL(&o, &t);
1913 WARN_ON(ret);
1914
1915 ret = WWL(&o2, &t);
1916 WARN_ON(ret != -EDEADLK);
1917
1918 o2.ctx = NULL;
1919 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1920 ww_mutex_base_unlock(&o2.base);
1921
1922 WWL(&o2, &t);
1923}
1924
1925static void ww_test_edeadlk_no_unlock_slow(void)
1926{
1927 int ret;
1928
1929 ww_mutex_base_lock(&o2.base);
1930 mutex_release(&o2.base.dep_map, _THIS_IP_);
1931 o2.ctx = &t2;
1932
1933 WWAI(&t);
1934 t2 = t;
1935 t2.stamp--;
1936
1937 ret = WWL(&o, &t);
1938 WARN_ON(ret);
1939
1940 ret = WWL(&o2, &t);
1941 WARN_ON(ret != -EDEADLK);
1942
1943 o2.ctx = NULL;
1944 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1945 ww_mutex_base_unlock(&o2.base);
1946
1947 ww_mutex_lock_slow(&o2, &t);
1948}
1949
1950static void ww_test_edeadlk_acquire_more(void)
1951{
1952 int ret;
1953
1954 ww_mutex_base_lock(&o2.base);
1955 mutex_release(&o2.base.dep_map, _THIS_IP_);
1956 o2.ctx = &t2;
1957
1958 WWAI(&t);
1959 t2 = t;
1960 t2.stamp--;
1961
1962 ret = WWL(&o, &t);
1963 WARN_ON(ret);
1964
1965 ret = WWL(&o2, &t);
1966 WARN_ON(ret != -EDEADLK);
1967
1968 ret = WWL(&o3, &t);
1969}
1970
1971static void ww_test_edeadlk_acquire_more_slow(void)
1972{
1973 int ret;
1974
1975 ww_mutex_base_lock(&o2.base);
1976 mutex_release(&o2.base.dep_map, _THIS_IP_);
1977 o2.ctx = &t2;
1978
1979 WWAI(&t);
1980 t2 = t;
1981 t2.stamp--;
1982
1983 ret = WWL(&o, &t);
1984 WARN_ON(ret);
1985
1986 ret = WWL(&o2, &t);
1987 WARN_ON(ret != -EDEADLK);
1988
1989 ww_mutex_lock_slow(&o3, &t);
1990}
1991
1992static void ww_test_edeadlk_acquire_more_edeadlk(void)
1993{
1994 int ret;
1995
1996 ww_mutex_base_lock(&o2.base);
1997 mutex_release(&o2.base.dep_map, _THIS_IP_);
1998 o2.ctx = &t2;
1999
2000 ww_mutex_base_lock(&o3.base);
2001 mutex_release(&o3.base.dep_map, _THIS_IP_);
2002 o3.ctx = &t2;
2003
2004 WWAI(&t);
2005 t2 = t;
2006 t2.stamp--;
2007
2008 ret = WWL(&o, &t);
2009 WARN_ON(ret);
2010
2011 ret = WWL(&o2, &t);
2012 WARN_ON(ret != -EDEADLK);
2013
2014 ret = WWL(&o3, &t);
2015 WARN_ON(ret != -EDEADLK);
2016}
2017
2018static void ww_test_edeadlk_acquire_more_edeadlk_slow(void)
2019{
2020 int ret;
2021
2022 ww_mutex_base_lock(&o2.base);
2023 mutex_release(&o2.base.dep_map, _THIS_IP_);
2024 o2.ctx = &t2;
2025
2026 ww_mutex_base_lock(&o3.base);
2027 mutex_release(&o3.base.dep_map, _THIS_IP_);
2028 o3.ctx = &t2;
2029
2030 WWAI(&t);
2031 t2 = t;
2032 t2.stamp--;
2033
2034 ret = WWL(&o, &t);
2035 WARN_ON(ret);
2036
2037 ret = WWL(&o2, &t);
2038 WARN_ON(ret != -EDEADLK);
2039
2040 ww_mutex_lock_slow(&o3, &t);
2041}
2042
2043static void ww_test_edeadlk_acquire_wrong(void)
2044{
2045 int ret;
2046
2047 ww_mutex_base_lock(&o2.base);
2048 mutex_release(&o2.base.dep_map, _THIS_IP_);
2049 o2.ctx = &t2;
2050
2051 WWAI(&t);
2052 t2 = t;
2053 t2.stamp--;
2054
2055 ret = WWL(&o, &t);
2056 WARN_ON(ret);
2057
2058 ret = WWL(&o2, &t);
2059 WARN_ON(ret != -EDEADLK);
2060 if (!ret)
2061 WWU(&o2);
2062
2063 WWU(&o);
2064
2065 ret = WWL(&o3, &t);
2066}
2067
2068static void ww_test_edeadlk_acquire_wrong_slow(void)
2069{
2070 int ret;
2071
2072 ww_mutex_base_lock(&o2.base);
2073 mutex_release(&o2.base.dep_map, _THIS_IP_);
2074 o2.ctx = &t2;
2075
2076 WWAI(&t);
2077 t2 = t;
2078 t2.stamp--;
2079
2080 ret = WWL(&o, &t);
2081 WARN_ON(ret);
2082
2083 ret = WWL(&o2, &t);
2084 WARN_ON(ret != -EDEADLK);
2085 if (!ret)
2086 WWU(&o2);
2087
2088 WWU(&o);
2089
2090 ww_mutex_lock_slow(&o3, &t);
2091}
2092
2093static void ww_test_spin_nest_unlocked(void)
2094{
2095 spin_lock_nest_lock(&lock_A, &o.base);
2096 U(A);
2097}
2098
2099/* This is not a deadlock, because we have X1 to serialize Y1 and Y2 */
2100static void ww_test_spin_nest_lock(void)
2101{
2102 spin_lock(&lock_X1);
2103 spin_lock_nest_lock(&lock_Y1, &lock_X1);
2104 spin_lock(&lock_A);
2105 spin_lock_nest_lock(&lock_Y2, &lock_X1);
2106 spin_unlock(&lock_A);
2107 spin_unlock(&lock_Y2);
2108 spin_unlock(&lock_Y1);
2109 spin_unlock(&lock_X1);
2110}
2111
2112static void ww_test_unneeded_slow(void)
2113{
2114 WWAI(&t);
2115
2116 ww_mutex_lock_slow(&o, &t);
2117}
2118
2119static void ww_test_context_block(void)
2120{
2121 int ret;
2122
2123 WWAI(&t);
2124
2125 ret = WWL(&o, &t);
2126 WARN_ON(ret);
2127 WWL1(&o2);
2128}
2129
2130static void ww_test_context_try(void)
2131{
2132 int ret;
2133
2134 WWAI(&t);
2135
2136 ret = WWL(&o, &t);
2137 WARN_ON(ret);
2138
2139 ret = WWT(&o2);
2140 WARN_ON(!ret);
2141 WWU(&o2);
2142 WWU(&o);
2143}
2144
2145static void ww_test_context_context(void)
2146{
2147 int ret;
2148
2149 WWAI(&t);
2150
2151 ret = WWL(&o, &t);
2152 WARN_ON(ret);
2153
2154 ret = WWL(&o2, &t);
2155 WARN_ON(ret);
2156
2157 WWU(&o2);
2158 WWU(&o);
2159}
2160
2161static void ww_test_try_block(void)
2162{
2163 bool ret;
2164
2165 ret = WWT(&o);
2166 WARN_ON(!ret);
2167
2168 WWL1(&o2);
2169 WWU(&o2);
2170 WWU(&o);
2171}
2172
2173static void ww_test_try_try(void)
2174{
2175 bool ret;
2176
2177 ret = WWT(&o);
2178 WARN_ON(!ret);
2179 ret = WWT(&o2);
2180 WARN_ON(!ret);
2181 WWU(&o2);
2182 WWU(&o);
2183}
2184
2185static void ww_test_try_context(void)
2186{
2187 int ret;
2188
2189 ret = WWT(&o);
2190 WARN_ON(!ret);
2191
2192 WWAI(&t);
2193
2194 ret = WWL(&o2, &t);
2195 WARN_ON(ret);
2196}
2197
2198static void ww_test_block_block(void)
2199{
2200 WWL1(&o);
2201 WWL1(&o2);
2202}
2203
2204static void ww_test_block_try(void)
2205{
2206 bool ret;
2207
2208 WWL1(&o);
2209 ret = WWT(&o2);
2210 WARN_ON(!ret);
2211}
2212
2213static void ww_test_block_context(void)
2214{
2215 int ret;
2216
2217 WWL1(&o);
2218 WWAI(&t);
2219
2220 ret = WWL(&o2, &t);
2221 WARN_ON(ret);
2222}
2223
2224static void ww_test_spin_block(void)
2225{
2226 L(A);
2227 U(A);
2228
2229 WWL1(&o);
2230 L(A);
2231 U(A);
2232 WWU(&o);
2233
2234 L(A);
2235 WWL1(&o);
2236 WWU(&o);
2237 U(A);
2238}
2239
2240static void ww_test_spin_try(void)
2241{
2242 bool ret;
2243
2244 L(A);
2245 U(A);
2246
2247 ret = WWT(&o);
2248 WARN_ON(!ret);
2249 L(A);
2250 U(A);
2251 WWU(&o);
2252
2253 L(A);
2254 ret = WWT(&o);
2255 WARN_ON(!ret);
2256 WWU(&o);
2257 U(A);
2258}
2259
2260static void ww_test_spin_context(void)
2261{
2262 int ret;
2263
2264 L(A);
2265 U(A);
2266
2267 WWAI(&t);
2268
2269 ret = WWL(&o, &t);
2270 WARN_ON(ret);
2271 L(A);
2272 U(A);
2273 WWU(&o);
2274
2275 L(A);
2276 ret = WWL(&o, &t);
2277 WARN_ON(ret);
2278 WWU(&o);
2279 U(A);
2280}
2281
2282static void ww_tests(void)
2283{
2284 printk(" --------------------------------------------------------------------------\n");
2285 printk(" | Wound/wait tests |\n");
2286 printk(" ---------------------\n");
2287
2288 print_testname("ww api failures");
2289 dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW);
2290 dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW);
2291 dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW);
2292 pr_cont("\n");
2293
2294 print_testname("ww contexts mixing");
2295 dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW);
2296 dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW);
2297 pr_cont("\n");
2298
2299 print_testname("finishing ww context");
2300 dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW);
2301 dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW);
2302 dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW);
2303 dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW);
2304 pr_cont("\n");
2305
2306 print_testname("locking mismatches");
2307 dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW);
2308 dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW);
2309 dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW);
2310 pr_cont("\n");
2311
2312 print_testname("EDEADLK handling");
2313 dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW);
2314 dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW);
2315 dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW);
2316 dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW);
2317 dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW);
2318 dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW);
2319 dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW);
2320 dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW);
2321 dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW);
2322 dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW);
2323 pr_cont("\n");
2324
2325 print_testname("spinlock nest unlocked");
2326 dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW);
2327 pr_cont("\n");
2328
2329 print_testname("spinlock nest test");
2330 dotest(ww_test_spin_nest_lock, SUCCESS, LOCKTYPE_WW);
2331 pr_cont("\n");
2332
2333 printk(" -----------------------------------------------------\n");
2334 printk(" |block | try |context|\n");
2335 printk(" -----------------------------------------------------\n");
2336
2337 print_testname("context");
2338 dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW);
2339 dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW);
2340 dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW);
2341 pr_cont("\n");
2342
2343 print_testname("try");
2344 dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW);
2345 dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW);
2346 dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW);
2347 pr_cont("\n");
2348
2349 print_testname("block");
2350 dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW);
2351 dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW);
2352 dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW);
2353 pr_cont("\n");
2354
2355 print_testname("spinlock");
2356 dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW);
2357 dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW);
2358 dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW);
2359 pr_cont("\n");
2360}
2361
2362
2363/*
2364 * <in hardirq handler>
2365 * read_lock(&A);
2366 * <hardirq disable>
2367 * spin_lock(&B);
2368 * spin_lock(&B);
2369 * read_lock(&A);
2370 *
2371 * is a deadlock.
2372 */
2373static void queued_read_lock_hardirq_RE_Er(void)
2374{
2375 HARDIRQ_ENTER();
2376 read_lock(&rwlock_A);
2377 LOCK(B);
2378 UNLOCK(B);
2379 read_unlock(&rwlock_A);
2380 HARDIRQ_EXIT();
2381
2382 HARDIRQ_DISABLE();
2383 LOCK(B);
2384 read_lock(&rwlock_A);
2385 read_unlock(&rwlock_A);
2386 UNLOCK(B);
2387 HARDIRQ_ENABLE();
2388}
2389
2390/*
2391 * <in hardirq handler>
2392 * spin_lock(&B);
2393 * <hardirq disable>
2394 * read_lock(&A);
2395 * read_lock(&A);
2396 * spin_lock(&B);
2397 *
2398 * is not a deadlock.
2399 */
2400static void queued_read_lock_hardirq_ER_rE(void)
2401{
2402 HARDIRQ_ENTER();
2403 LOCK(B);
2404 read_lock(&rwlock_A);
2405 read_unlock(&rwlock_A);
2406 UNLOCK(B);
2407 HARDIRQ_EXIT();
2408
2409 HARDIRQ_DISABLE();
2410 read_lock(&rwlock_A);
2411 LOCK(B);
2412 UNLOCK(B);
2413 read_unlock(&rwlock_A);
2414 HARDIRQ_ENABLE();
2415}
2416
2417/*
2418 * <hardirq disable>
2419 * spin_lock(&B);
2420 * read_lock(&A);
2421 * <in hardirq handler>
2422 * spin_lock(&B);
2423 * read_lock(&A);
2424 *
2425 * is a deadlock. Because the two read_lock()s are both non-recursive readers.
2426 */
2427static void queued_read_lock_hardirq_inversion(void)
2428{
2429
2430 HARDIRQ_ENTER();
2431 LOCK(B);
2432 UNLOCK(B);
2433 HARDIRQ_EXIT();
2434
2435 HARDIRQ_DISABLE();
2436 LOCK(B);
2437 read_lock(&rwlock_A);
2438 read_unlock(&rwlock_A);
2439 UNLOCK(B);
2440 HARDIRQ_ENABLE();
2441
2442 read_lock(&rwlock_A);
2443 read_unlock(&rwlock_A);
2444}
2445
2446static void queued_read_lock_tests(void)
2447{
2448 printk(" --------------------------------------------------------------------------\n");
2449 printk(" | queued read lock tests |\n");
2450 printk(" ---------------------------\n");
2451 print_testname("hardirq read-lock/lock-read");
2452 dotest(queued_read_lock_hardirq_RE_Er, FAILURE, LOCKTYPE_RWLOCK);
2453 pr_cont("\n");
2454
2455 print_testname("hardirq lock-read/read-lock");
2456 dotest(queued_read_lock_hardirq_ER_rE, SUCCESS, LOCKTYPE_RWLOCK);
2457 pr_cont("\n");
2458
2459 print_testname("hardirq inversion");
2460 dotest(queued_read_lock_hardirq_inversion, FAILURE, LOCKTYPE_RWLOCK);
2461 pr_cont("\n");
2462}
2463
2464static void fs_reclaim_correct_nesting(void)
2465{
2466 fs_reclaim_acquire(GFP_KERNEL);
2467 might_alloc(GFP_NOFS);
2468 fs_reclaim_release(GFP_KERNEL);
2469}
2470
2471static void fs_reclaim_wrong_nesting(void)
2472{
2473 fs_reclaim_acquire(GFP_KERNEL);
2474 might_alloc(GFP_KERNEL);
2475 fs_reclaim_release(GFP_KERNEL);
2476}
2477
2478static void fs_reclaim_protected_nesting(void)
2479{
2480 unsigned int flags;
2481
2482 fs_reclaim_acquire(GFP_KERNEL);
2483 flags = memalloc_nofs_save();
2484 might_alloc(GFP_KERNEL);
2485 memalloc_nofs_restore(flags);
2486 fs_reclaim_release(GFP_KERNEL);
2487}
2488
2489static void fs_reclaim_tests(void)
2490{
2491 printk(" --------------------\n");
2492 printk(" | fs_reclaim tests |\n");
2493 printk(" --------------------\n");
2494
2495 print_testname("correct nesting");
2496 dotest(fs_reclaim_correct_nesting, SUCCESS, 0);
2497 pr_cont("\n");
2498
2499 print_testname("wrong nesting");
2500 dotest(fs_reclaim_wrong_nesting, FAILURE, 0);
2501 pr_cont("\n");
2502
2503 print_testname("protected nesting");
2504 dotest(fs_reclaim_protected_nesting, SUCCESS, 0);
2505 pr_cont("\n");
2506}
2507
2508/* Defines guard classes to create contexts */
2509DEFINE_LOCK_GUARD_0(HARDIRQ, HARDIRQ_ENTER(), HARDIRQ_EXIT())
2510DEFINE_LOCK_GUARD_0(NOTTHREADED_HARDIRQ,
2511 do {
2512 local_irq_disable();
2513 __irq_enter();
2514 WARN_ON(!in_hardirq());
2515 } while(0), HARDIRQ_EXIT())
2516DEFINE_LOCK_GUARD_0(SOFTIRQ, SOFTIRQ_ENTER(), SOFTIRQ_EXIT())
2517
2518/* Define RCU guards, should go away when RCU has its own guard definitions */
2519DEFINE_LOCK_GUARD_0(RCU, rcu_read_lock(), rcu_read_unlock())
2520DEFINE_LOCK_GUARD_0(RCU_BH, rcu_read_lock_bh(), rcu_read_unlock_bh())
2521DEFINE_LOCK_GUARD_0(RCU_SCHED, rcu_read_lock_sched(), rcu_read_unlock_sched())
2522
2523
2524#define GENERATE_2_CONTEXT_TESTCASE(outer, outer_lock, inner, inner_lock) \
2525 \
2526static void __maybe_unused inner##_in_##outer(void) \
2527{ \
2528 /* Relies the reversed clean-up ordering: inner first */ \
2529 guard(outer)(outer_lock); \
2530 guard(inner)(inner_lock); \
2531}
2532
2533/*
2534 * wait contexts (considering PREEMPT_RT)
2535 *
2536 * o: inner is allowed in outer
2537 * x: inner is disallowed in outer
2538 *
2539 * \ inner | RCU | RAW_SPIN | SPIN | MUTEX
2540 * outer \ | | | |
2541 * ---------------+-------+----------+------+-------
2542 * HARDIRQ | o | o | o | x
2543 * ---------------+-------+----------+------+-------
2544 * NOTTHREADED_IRQ| o | o | x | x
2545 * ---------------+-------+----------+------+-------
2546 * SOFTIRQ | o | o | o | x
2547 * ---------------+-------+----------+------+-------
2548 * RCU | o | o | o | x
2549 * ---------------+-------+----------+------+-------
2550 * RCU_BH | o | o | o | x
2551 * ---------------+-------+----------+------+-------
2552 * RCU_SCHED | o | o | x | x
2553 * ---------------+-------+----------+------+-------
2554 * RAW_SPIN | o | o | x | x
2555 * ---------------+-------+----------+------+-------
2556 * SPIN | o | o | o | x
2557 * ---------------+-------+----------+------+-------
2558 * MUTEX | o | o | o | o
2559 * ---------------+-------+----------+------+-------
2560 */
2561
2562#define GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(inner, inner_lock) \
2563GENERATE_2_CONTEXT_TESTCASE(HARDIRQ, , inner, inner_lock) \
2564GENERATE_2_CONTEXT_TESTCASE(NOTTHREADED_HARDIRQ, , inner, inner_lock) \
2565GENERATE_2_CONTEXT_TESTCASE(SOFTIRQ, , inner, inner_lock) \
2566GENERATE_2_CONTEXT_TESTCASE(RCU, , inner, inner_lock) \
2567GENERATE_2_CONTEXT_TESTCASE(RCU_BH, , inner, inner_lock) \
2568GENERATE_2_CONTEXT_TESTCASE(RCU_SCHED, , inner, inner_lock) \
2569GENERATE_2_CONTEXT_TESTCASE(raw_spinlock, &raw_lock_A, inner, inner_lock) \
2570GENERATE_2_CONTEXT_TESTCASE(spinlock, &lock_A, inner, inner_lock) \
2571GENERATE_2_CONTEXT_TESTCASE(mutex, &mutex_A, inner, inner_lock)
2572
2573GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RCU, )
2574GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(raw_spinlock, &raw_lock_B)
2575GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(spinlock, &lock_B)
2576GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(mutex, &mutex_B)
2577
2578/* the outer context allows all kinds of preemption */
2579#define DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(outer) \
2580 dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \
2581 dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
2582 dotest(spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
2583 dotest(mutex_in_##outer, SUCCESS, LOCKTYPE_MUTEX); \
2584
2585/*
2586 * the outer context only allows the preemption introduced by spinlock_t (which
2587 * is a sleepable lock for PREEMPT_RT)
2588 */
2589#define DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(outer) \
2590 dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \
2591 dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
2592 dotest(spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
2593 dotest(mutex_in_##outer, FAILURE, LOCKTYPE_MUTEX); \
2594
2595/* the outer doesn't allows any kind of preemption */
2596#define DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(outer) \
2597 dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \
2598 dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
2599 dotest(spinlock_in_##outer, FAILURE, LOCKTYPE_SPIN); \
2600 dotest(mutex_in_##outer, FAILURE, LOCKTYPE_MUTEX); \
2601
2602static void wait_context_tests(void)
2603{
2604 printk(" --------------------------------------------------------------------------\n");
2605 printk(" | wait context tests |\n");
2606 printk(" --------------------------------------------------------------------------\n");
2607 printk(" | rcu | raw | spin |mutex |\n");
2608 printk(" --------------------------------------------------------------------------\n");
2609 print_testname("in hardirq context");
2610 DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(HARDIRQ);
2611 pr_cont("\n");
2612
2613 print_testname("in hardirq context (not threaded)");
2614 DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(NOTTHREADED_HARDIRQ);
2615 pr_cont("\n");
2616
2617 print_testname("in softirq context");
2618 DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SOFTIRQ);
2619 pr_cont("\n");
2620
2621 print_testname("in RCU context");
2622 DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU);
2623 pr_cont("\n");
2624
2625 print_testname("in RCU-bh context");
2626 DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU_BH);
2627 pr_cont("\n");
2628
2629 print_testname("in RCU-sched context");
2630 DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RCU_SCHED);
2631 pr_cont("\n");
2632
2633 print_testname("in RAW_SPINLOCK context");
2634 DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(raw_spinlock);
2635 pr_cont("\n");
2636
2637 print_testname("in SPINLOCK context");
2638 DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(spinlock);
2639 pr_cont("\n");
2640
2641 print_testname("in MUTEX context");
2642 DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(mutex);
2643 pr_cont("\n");
2644}
2645
2646static void local_lock_2(void)
2647{
2648 local_lock(&local_A); /* IRQ-ON */
2649 local_unlock(&local_A);
2650
2651 HARDIRQ_ENTER();
2652 spin_lock(&lock_A); /* IN-IRQ */
2653 spin_unlock(&lock_A);
2654 HARDIRQ_EXIT()
2655
2656 HARDIRQ_DISABLE();
2657 spin_lock(&lock_A);
2658 local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle, false */
2659 local_unlock(&local_A);
2660 spin_unlock(&lock_A);
2661 HARDIRQ_ENABLE();
2662}
2663
2664static void local_lock_3A(void)
2665{
2666 local_lock(&local_A); /* IRQ-ON */
2667 spin_lock(&lock_B); /* IRQ-ON */
2668 spin_unlock(&lock_B);
2669 local_unlock(&local_A);
2670
2671 HARDIRQ_ENTER();
2672 spin_lock(&lock_A); /* IN-IRQ */
2673 spin_unlock(&lock_A);
2674 HARDIRQ_EXIT()
2675
2676 HARDIRQ_DISABLE();
2677 spin_lock(&lock_A);
2678 local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
2679 local_unlock(&local_A);
2680 spin_unlock(&lock_A);
2681 HARDIRQ_ENABLE();
2682}
2683
2684static void local_lock_3B(void)
2685{
2686 local_lock(&local_A); /* IRQ-ON */
2687 spin_lock(&lock_B); /* IRQ-ON */
2688 spin_unlock(&lock_B);
2689 local_unlock(&local_A);
2690
2691 HARDIRQ_ENTER();
2692 spin_lock(&lock_A); /* IN-IRQ */
2693 spin_unlock(&lock_A);
2694 HARDIRQ_EXIT()
2695
2696 HARDIRQ_DISABLE();
2697 spin_lock(&lock_A);
2698 local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
2699 local_unlock(&local_A);
2700 spin_unlock(&lock_A);
2701 HARDIRQ_ENABLE();
2702
2703 HARDIRQ_DISABLE();
2704 spin_lock(&lock_A);
2705 spin_lock(&lock_B); /* IN-IRQ <-> IRQ-ON cycle, true */
2706 spin_unlock(&lock_B);
2707 spin_unlock(&lock_A);
2708 HARDIRQ_DISABLE();
2709
2710}
2711
2712#ifdef CONFIG_DEBUG_LOCK_ALLOC
2713static inline const char *rw_semaphore_lockdep_name(struct rw_semaphore *rwsem)
2714{
2715 return rwsem->dep_map.name;
2716}
2717#else
2718static inline const char *rw_semaphore_lockdep_name(struct rw_semaphore *rwsem)
2719{
2720 return NULL;
2721}
2722#endif
2723
2724static void test_lockdep_set_subclass_name(void)
2725{
2726 const char *name_before = rw_semaphore_lockdep_name(&rwsem_X1);
2727 const char *name_after;
2728
2729 lockdep_set_subclass(&rwsem_X1, 1);
2730 name_after = rw_semaphore_lockdep_name(&rwsem_X1);
2731 DEBUG_LOCKS_WARN_ON(name_before != name_after);
2732}
2733
2734/*
2735 * lockdep_set_subclass() should reuse the existing lock class name instead
2736 * of creating a new one.
2737 */
2738static void lockdep_set_subclass_name_test(void)
2739{
2740 printk(" --------------------------------------------------------------------------\n");
2741 printk(" | lockdep_set_subclass() name test|\n");
2742 printk(" -----------------------------------\n");
2743
2744 print_testname("compare name before and after");
2745 dotest(test_lockdep_set_subclass_name, SUCCESS, LOCKTYPE_RWSEM);
2746 pr_cont("\n");
2747}
2748
2749static void local_lock_tests(void)
2750{
2751 printk(" --------------------------------------------------------------------------\n");
2752 printk(" | local_lock tests |\n");
2753 printk(" ---------------------\n");
2754
2755 print_testname("local_lock inversion 2");
2756 dotest(local_lock_2, SUCCESS, LOCKTYPE_LL);
2757 pr_cont("\n");
2758
2759 print_testname("local_lock inversion 3A");
2760 dotest(local_lock_3A, SUCCESS, LOCKTYPE_LL);
2761 pr_cont("\n");
2762
2763 print_testname("local_lock inversion 3B");
2764 dotest(local_lock_3B, FAILURE, LOCKTYPE_LL);
2765 pr_cont("\n");
2766}
2767
2768static void hardirq_deadlock_softirq_not_deadlock(void)
2769{
2770 /* mutex_A is hardirq-unsafe and softirq-unsafe */
2771 /* mutex_A -> lock_C */
2772 mutex_lock(&mutex_A);
2773 HARDIRQ_DISABLE();
2774 spin_lock(&lock_C);
2775 spin_unlock(&lock_C);
2776 HARDIRQ_ENABLE();
2777 mutex_unlock(&mutex_A);
2778
2779 /* lock_A is hardirq-safe */
2780 HARDIRQ_ENTER();
2781 spin_lock(&lock_A);
2782 spin_unlock(&lock_A);
2783 HARDIRQ_EXIT();
2784
2785 /* lock_A -> lock_B */
2786 HARDIRQ_DISABLE();
2787 spin_lock(&lock_A);
2788 spin_lock(&lock_B);
2789 spin_unlock(&lock_B);
2790 spin_unlock(&lock_A);
2791 HARDIRQ_ENABLE();
2792
2793 /* lock_B -> lock_C */
2794 HARDIRQ_DISABLE();
2795 spin_lock(&lock_B);
2796 spin_lock(&lock_C);
2797 spin_unlock(&lock_C);
2798 spin_unlock(&lock_B);
2799 HARDIRQ_ENABLE();
2800
2801 /* lock_D is softirq-safe */
2802 SOFTIRQ_ENTER();
2803 spin_lock(&lock_D);
2804 spin_unlock(&lock_D);
2805 SOFTIRQ_EXIT();
2806
2807 /* And lock_D is hardirq-unsafe */
2808 SOFTIRQ_DISABLE();
2809 spin_lock(&lock_D);
2810 spin_unlock(&lock_D);
2811 SOFTIRQ_ENABLE();
2812
2813 /*
2814 * mutex_A -> lock_C -> lock_D is softirq-unsafe -> softirq-safe, not
2815 * deadlock.
2816 *
2817 * lock_A -> lock_B -> lock_C -> lock_D is hardirq-safe ->
2818 * hardirq-unsafe, deadlock.
2819 */
2820 HARDIRQ_DISABLE();
2821 spin_lock(&lock_C);
2822 spin_lock(&lock_D);
2823 spin_unlock(&lock_D);
2824 spin_unlock(&lock_C);
2825 HARDIRQ_ENABLE();
2826}
2827
2828void locking_selftest(void)
2829{
2830 /*
2831 * Got a locking failure before the selftest ran?
2832 */
2833 if (!debug_locks) {
2834 printk("----------------------------------\n");
2835 printk("| Locking API testsuite disabled |\n");
2836 printk("----------------------------------\n");
2837 return;
2838 }
2839
2840 /*
2841 * treats read_lock() as recursive read locks for testing purpose
2842 */
2843 force_read_lock_recursive = 1;
2844
2845 /*
2846 * Run the testsuite:
2847 */
2848 printk("------------------------\n");
2849 printk("| Locking API testsuite:\n");
2850 printk("----------------------------------------------------------------------------\n");
2851 printk(" | spin |wlock |rlock |mutex | wsem | rsem |rtmutex\n");
2852 printk(" --------------------------------------------------------------------------\n");
2853
2854 init_shared_classes();
2855 lockdep_set_selftest_task(current);
2856
2857 DO_TESTCASE_6R("A-A deadlock", AA);
2858 DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
2859 DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA);
2860 DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC);
2861 DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA);
2862 DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA);
2863 DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA);
2864 DO_TESTCASE_6("double unlock", double_unlock);
2865 DO_TESTCASE_6("initialize held", init_held);
2866
2867 printk(" --------------------------------------------------------------------------\n");
2868 print_testname("recursive read-lock");
2869 pr_cont(" |");
2870 dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
2871 pr_cont(" |");
2872 dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
2873 pr_cont("\n");
2874
2875 print_testname("recursive read-lock #2");
2876 pr_cont(" |");
2877 dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK);
2878 pr_cont(" |");
2879 dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
2880 pr_cont("\n");
2881
2882 print_testname("mixed read-write-lock");
2883 pr_cont(" |");
2884 dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK);
2885 pr_cont(" |");
2886 dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM);
2887 pr_cont("\n");
2888
2889 print_testname("mixed write-read-lock");
2890 pr_cont(" |");
2891 dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK);
2892 pr_cont(" |");
2893 dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
2894 pr_cont("\n");
2895
2896 print_testname("mixed read-lock/lock-write ABBA");
2897 pr_cont(" |");
2898 dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
2899 pr_cont(" |");
2900 dotest(rwsem_ABBA1, FAILURE, LOCKTYPE_RWSEM);
2901
2902 print_testname("mixed read-lock/lock-read ABBA");
2903 pr_cont(" |");
2904 dotest(rlock_ABBA2, SUCCESS, LOCKTYPE_RWLOCK);
2905 pr_cont(" |");
2906 dotest(rwsem_ABBA2, FAILURE, LOCKTYPE_RWSEM);
2907
2908 print_testname("mixed write-lock/lock-write ABBA");
2909 pr_cont(" |");
2910 dotest(rlock_ABBA3, FAILURE, LOCKTYPE_RWLOCK);
2911 pr_cont(" |");
2912 dotest(rwsem_ABBA3, FAILURE, LOCKTYPE_RWSEM);
2913
2914 print_testname("chain cached mixed R-L/L-W ABBA");
2915 pr_cont(" |");
2916 dotest(rlock_chaincache_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
2917
2918 DO_TESTCASE_6x1RRB("rlock W1R2/W2R3/W3R1", W1R2_W2R3_W3R1);
2919 DO_TESTCASE_6x1RRB("rlock W1W2/R2R3/W3R1", W1W2_R2R3_W3R1);
2920 DO_TESTCASE_6x1RR("rlock W1W2/R2R3/R3W1", W1W2_R2R3_R3W1);
2921 DO_TESTCASE_6x1RR("rlock W1R2/R2R3/W3W1", W1R2_R2R3_W3W1);
2922
2923 printk(" --------------------------------------------------------------------------\n");
2924 /*
2925 * irq-context testcases:
2926 */
2927 DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1);
2928 NON_RT(DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A));
2929 DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B);
2930 DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3);
2931 DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4);
2932 DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion);
2933
2934 DO_TESTCASE_6x2x2RW("irq read-recursion", irq_read_recursion);
2935 DO_TESTCASE_6x2x2RW("irq read-recursion #2", irq_read_recursion2);
2936 DO_TESTCASE_6x2x2RW("irq read-recursion #3", irq_read_recursion3);
2937
2938 ww_tests();
2939
2940 force_read_lock_recursive = 0;
2941 /*
2942 * queued_read_lock() specific test cases can be put here
2943 */
2944 if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS))
2945 queued_read_lock_tests();
2946
2947 fs_reclaim_tests();
2948
2949 /* Wait context test cases that are specific for RAW_LOCK_NESTING */
2950 if (IS_ENABLED(CONFIG_PROVE_RAW_LOCK_NESTING))
2951 wait_context_tests();
2952
2953 local_lock_tests();
2954
2955 print_testname("hardirq_unsafe_softirq_safe");
2956 dotest(hardirq_deadlock_softirq_not_deadlock, FAILURE, LOCKTYPE_SPECIAL);
2957 pr_cont("\n");
2958
2959 lockdep_set_subclass_name_test();
2960
2961 if (unexpected_testcase_failures) {
2962 printk("-----------------------------------------------------------------\n");
2963 debug_locks = 0;
2964 printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
2965 unexpected_testcase_failures, testcase_total);
2966 printk("-----------------------------------------------------------------\n");
2967 } else if (expected_testcase_failures && testcase_successes) {
2968 printk("--------------------------------------------------------\n");
2969 printk("%3d out of %3d testcases failed, as expected. |\n",
2970 expected_testcase_failures, testcase_total);
2971 printk("----------------------------------------------------\n");
2972 debug_locks = 1;
2973 } else if (expected_testcase_failures && !testcase_successes) {
2974 printk("--------------------------------------------------------\n");
2975 printk("All %3d testcases failed, as expected. |\n",
2976 expected_testcase_failures);
2977 printk("----------------------------------------\n");
2978 debug_locks = 1;
2979 } else {
2980 printk("-------------------------------------------------------\n");
2981 printk("Good, all %3d testcases passed! |\n",
2982 testcase_successes);
2983 printk("---------------------------------\n");
2984 debug_locks = 1;
2985 }
2986 lockdep_set_selftest_task(NULL);
2987 debug_locks_silent = 0;
2988}