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lockdep/selftest: Introduce recursion3
[linux-2.6-block.git] / lib / locking-selftest.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
cae2ed9a
IM		 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 <mingo@redhat.com>
13 */
14#include <linux/rwsem.h>
15#include <linux/mutex.h>
1b375dc3 16#include <linux/ww_mutex.h>
cae2ed9a
IM		 17#include <linux/sched.h>
18#include <linux/delay.h>
fbb9ce95 19#include <linux/lockdep.h>
cae2ed9a
IM		 20#include <linux/spinlock.h>
21#include <linux/kallsyms.h>
22#include <linux/interrupt.h>
23#include <linux/debug_locks.h>
24#include <linux/irqflags.h>
018956d6 25#include <linux/rtmutex.h>
cae2ed9a
IM		 26
27/*
28 * Change this to 1 if you want to see the failure printouts:
29 */
30static unsigned int debug_locks_verbose;
e9181886 31unsigned int force_read_lock_recursive;
cae2ed9a 32
08295b3b 33static DEFINE_WD_CLASS(ww_lockdep);
1de99445 34
cae2ed9a
IM		 35static int __init setup_debug_locks_verbose(char *str)
36{
37 get_option(&str, &debug_locks_verbose);
38
39 return 1;
40}
41
42__setup("debug_locks_verbose=", setup_debug_locks_verbose);
43
44#define FAILURE 0
45#define SUCCESS 1
46
47#define LOCKTYPE_SPIN 0x1
48#define LOCKTYPE_RWLOCK 0x2
49#define LOCKTYPE_MUTEX 0x4
50#define LOCKTYPE_RWSEM 0x8
1de99445 51#define LOCKTYPE_WW 0x10
018956d6 52#define LOCKTYPE_RTMUTEX 0x20
1de99445
ML		 53
54static struct ww_acquire_ctx t, t2;
f3cf139e 55static struct ww_mutex o, o2, o3;
cae2ed9a
IM		 56
57/*
58 * Normal standalone locks, for the circular and irq-context
59 * dependency tests:
60 */
9fb1b90c
YZ		 61static DEFINE_RAW_SPINLOCK(lock_A);
62static DEFINE_RAW_SPINLOCK(lock_B);
63static DEFINE_RAW_SPINLOCK(lock_C);
64static DEFINE_RAW_SPINLOCK(lock_D);
cae2ed9a
IM		 65
66static DEFINE_RWLOCK(rwlock_A);
67static DEFINE_RWLOCK(rwlock_B);
68static DEFINE_RWLOCK(rwlock_C);
69static DEFINE_RWLOCK(rwlock_D);
70
71static DEFINE_MUTEX(mutex_A);
72static DEFINE_MUTEX(mutex_B);
73static DEFINE_MUTEX(mutex_C);
74static DEFINE_MUTEX(mutex_D);
75
76static DECLARE_RWSEM(rwsem_A);
77static DECLARE_RWSEM(rwsem_B);
78static DECLARE_RWSEM(rwsem_C);
79static DECLARE_RWSEM(rwsem_D);
80
018956d6
PZ		 81#ifdef CONFIG_RT_MUTEXES
82
83static DEFINE_RT_MUTEX(rtmutex_A);
84static DEFINE_RT_MUTEX(rtmutex_B);
85static DEFINE_RT_MUTEX(rtmutex_C);
86static DEFINE_RT_MUTEX(rtmutex_D);
87
88#endif
89
cae2ed9a
IM		 90/*
91 * Locks that we initialize dynamically as well so that
92 * e.g. X1 and X2 becomes two instances of the same class,
93 * but X* and Y* are different classes. We do this so that
94 * we do not trigger a real lockup:
95 */
9fb1b90c
YZ		 96static DEFINE_RAW_SPINLOCK(lock_X1);
97static DEFINE_RAW_SPINLOCK(lock_X2);
98static DEFINE_RAW_SPINLOCK(lock_Y1);
99static DEFINE_RAW_SPINLOCK(lock_Y2);
100static DEFINE_RAW_SPINLOCK(lock_Z1);
101static DEFINE_RAW_SPINLOCK(lock_Z2);
cae2ed9a
IM		 102
103static DEFINE_RWLOCK(rwlock_X1);
104static DEFINE_RWLOCK(rwlock_X2);
105static DEFINE_RWLOCK(rwlock_Y1);
106static DEFINE_RWLOCK(rwlock_Y2);
107static DEFINE_RWLOCK(rwlock_Z1);
108static DEFINE_RWLOCK(rwlock_Z2);
109
110static DEFINE_MUTEX(mutex_X1);
111static DEFINE_MUTEX(mutex_X2);
112static DEFINE_MUTEX(mutex_Y1);
113static DEFINE_MUTEX(mutex_Y2);
114static DEFINE_MUTEX(mutex_Z1);
115static DEFINE_MUTEX(mutex_Z2);
116
117static DECLARE_RWSEM(rwsem_X1);
118static DECLARE_RWSEM(rwsem_X2);
119static DECLARE_RWSEM(rwsem_Y1);
120static DECLARE_RWSEM(rwsem_Y2);
121static DECLARE_RWSEM(rwsem_Z1);
122static DECLARE_RWSEM(rwsem_Z2);
123
018956d6
PZ		 124#ifdef CONFIG_RT_MUTEXES
125
126static DEFINE_RT_MUTEX(rtmutex_X1);
127static DEFINE_RT_MUTEX(rtmutex_X2);
128static DEFINE_RT_MUTEX(rtmutex_Y1);
129static DEFINE_RT_MUTEX(rtmutex_Y2);
130static DEFINE_RT_MUTEX(rtmutex_Z1);
131static DEFINE_RT_MUTEX(rtmutex_Z2);
132
133#endif
134
cae2ed9a
IM		 135/*
136 * non-inlined runtime initializers, to let separate locks share
137 * the same lock-class:
138 */
139#define INIT_CLASS_FUNC(class) \
140static noinline void \
9fb1b90c
YZ		 141init_class_##class(raw_spinlock_t *lock, rwlock_t *rwlock, \
142 struct mutex *mutex, struct rw_semaphore *rwsem)\
cae2ed9a 143{ \
9fb1b90c 144 raw_spin_lock_init(lock); \
cae2ed9a
IM		 145 rwlock_init(rwlock); \
146 mutex_init(mutex); \
147 init_rwsem(rwsem); \
148}
149
150INIT_CLASS_FUNC(X)
151INIT_CLASS_FUNC(Y)
152INIT_CLASS_FUNC(Z)
153
154static void init_shared_classes(void)
155{
018956d6
PZ		 156#ifdef CONFIG_RT_MUTEXES
157 static struct lock_class_key rt_X, rt_Y, rt_Z;
158
159 __rt_mutex_init(&rtmutex_X1, __func__, &rt_X);
160 __rt_mutex_init(&rtmutex_X2, __func__, &rt_X);
161 __rt_mutex_init(&rtmutex_Y1, __func__, &rt_Y);
162 __rt_mutex_init(&rtmutex_Y2, __func__, &rt_Y);
163 __rt_mutex_init(&rtmutex_Z1, __func__, &rt_Z);
164 __rt_mutex_init(&rtmutex_Z2, __func__, &rt_Z);
165#endif
166
cae2ed9a
IM		 167 init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1);
168 init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2);
169
170 init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1);
171 init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2);
172
173 init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1);
174 init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2);
175}
176
177/*
178 * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests.
179 * The following functions use a lock from a simulated hardirq/softirq
180 * context, causing the locks to be marked as hardirq-safe/softirq-safe:
181 */
182
183#define HARDIRQ_DISABLE local_irq_disable
184#define HARDIRQ_ENABLE local_irq_enable
185
186#define HARDIRQ_ENTER() \
187 local_irq_disable(); \
ba9f207c 188 __irq_enter(); \
cae2ed9a
IM		 189 WARN_ON(!in_irq());
190
191#define HARDIRQ_EXIT() \
192 __irq_exit(); \
193 local_irq_enable();
194
195#define SOFTIRQ_DISABLE local_bh_disable
196#define SOFTIRQ_ENABLE local_bh_enable
197
198#define SOFTIRQ_ENTER() \
199 local_bh_disable(); \
200 local_irq_disable(); \
d820ac4c 201 lockdep_softirq_enter(); \
cae2ed9a
IM		 202 WARN_ON(!in_softirq());
203
204#define SOFTIRQ_EXIT() \
d820ac4c 205 lockdep_softirq_exit(); \
cae2ed9a
IM		 206 local_irq_enable(); \
207 local_bh_enable();
208
209/*
210 * Shortcuts for lock/unlock API variants, to keep
211 * the testcases compact:
212 */
9fb1b90c
YZ		 213#define L(x) raw_spin_lock(&lock_##x)
214#define U(x) raw_spin_unlock(&lock_##x)
cae2ed9a 215#define LU(x) L(x); U(x)
9fb1b90c 216#define SI(x) raw_spin_lock_init(&lock_##x)
cae2ed9a
IM		 217
218#define WL(x) write_lock(&rwlock_##x)
219#define WU(x) write_unlock(&rwlock_##x)
220#define WLU(x) WL(x); WU(x)
221
222#define RL(x) read_lock(&rwlock_##x)
223#define RU(x) read_unlock(&rwlock_##x)
224#define RLU(x) RL(x); RU(x)
225#define RWI(x) rwlock_init(&rwlock_##x)
226
227#define ML(x) mutex_lock(&mutex_##x)
228#define MU(x) mutex_unlock(&mutex_##x)
229#define MI(x) mutex_init(&mutex_##x)
230
018956d6
PZ		 231#define RTL(x) rt_mutex_lock(&rtmutex_##x)
232#define RTU(x) rt_mutex_unlock(&rtmutex_##x)
233#define RTI(x) rt_mutex_init(&rtmutex_##x)
234
cae2ed9a
IM		 235#define WSL(x) down_write(&rwsem_##x)
236#define WSU(x) up_write(&rwsem_##x)
237
238#define RSL(x) down_read(&rwsem_##x)
239#define RSU(x) up_read(&rwsem_##x)
240#define RWSI(x) init_rwsem(&rwsem_##x)
241
1de99445
ML		 242#ifndef CONFIG_DEBUG_WW_MUTEX_SLOWPATH
243#define WWAI(x) ww_acquire_init(x, &ww_lockdep)
244#else
245#define WWAI(x) do { ww_acquire_init(x, &ww_lockdep); (x)->deadlock_inject_countdown = ~0U; } while (0)
246#endif
247#define WWAD(x) ww_acquire_done(x)
248#define WWAF(x) ww_acquire_fini(x)
249
250#define WWL(x, c) ww_mutex_lock(x, c)
251#define WWT(x) ww_mutex_trylock(x)
252#define WWL1(x) ww_mutex_lock(x, NULL)
253#define WWU(x) ww_mutex_unlock(x)
254
255
cae2ed9a
IM		 256#define LOCK_UNLOCK_2(x,y) LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x)
257
258/*
259 * Generate different permutations of the same testcase, using
260 * the same basic lock-dependency/state events:
261 */
262
263#define GENERATE_TESTCASE(name) \
264 \
265static void name(void) { E(); }
266
267#define GENERATE_PERMUTATIONS_2_EVENTS(name) \
268 \
269static void name##_12(void) { E1(); E2(); } \
270static void name##_21(void) { E2(); E1(); }
271
272#define GENERATE_PERMUTATIONS_3_EVENTS(name) \
273 \
274static void name##_123(void) { E1(); E2(); E3(); } \
275static void name##_132(void) { E1(); E3(); E2(); } \
276static void name##_213(void) { E2(); E1(); E3(); } \
277static void name##_231(void) { E2(); E3(); E1(); } \
278static void name##_312(void) { E3(); E1(); E2(); } \
279static void name##_321(void) { E3(); E2(); E1(); }
280
281/*
282 * AA deadlock:
283 */
284
285#define E() \
286 \
287 LOCK(X1); \
288 LOCK(X2); /* this one should fail */
289
290/*
291 * 6 testcases:
292 */
293#include "locking-selftest-spin.h"
294GENERATE_TESTCASE(AA_spin)
295#include "locking-selftest-wlock.h"
296GENERATE_TESTCASE(AA_wlock)
297#include "locking-selftest-rlock.h"
298GENERATE_TESTCASE(AA_rlock)
299#include "locking-selftest-mutex.h"
300GENERATE_TESTCASE(AA_mutex)
301#include "locking-selftest-wsem.h"
302GENERATE_TESTCASE(AA_wsem)
303#include "locking-selftest-rsem.h"
304GENERATE_TESTCASE(AA_rsem)
305
018956d6
PZ		 306#ifdef CONFIG_RT_MUTEXES
307#include "locking-selftest-rtmutex.h"
308GENERATE_TESTCASE(AA_rtmutex);
309#endif
310
cae2ed9a
IM		 311#undef E
312
313/*
314 * Special-case for read-locking, they are
6c9076ec 315 * allowed to recurse on the same lock class:
cae2ed9a
IM		 316 */
317static void rlock_AA1(void)
318{
319 RL(X1);
320 RL(X1); // this one should NOT fail
321}
322
323static void rlock_AA1B(void)
324{
325 RL(X1);
6c9076ec 326 RL(X2); // this one should NOT fail
cae2ed9a
IM		 327}
328
329static void rsem_AA1(void)
330{
331 RSL(X1);
332 RSL(X1); // this one should fail
333}
334
335static void rsem_AA1B(void)
336{
337 RSL(X1);
338 RSL(X2); // this one should fail
339}
340/*
341 * The mixing of read and write locks is not allowed:
342 */
343static void rlock_AA2(void)
344{
345 RL(X1);
346 WL(X2); // this one should fail
347}
348
349static void rsem_AA2(void)
350{
351 RSL(X1);
352 WSL(X2); // this one should fail
353}
354
355static void rlock_AA3(void)
356{
357 WL(X1);
358 RL(X2); // this one should fail
359}
360
361static void rsem_AA3(void)
362{
363 WSL(X1);
364 RSL(X2); // this one should fail
365}
366
e9149858
PZ		 367/*
368 * read_lock(A)
369 * spin_lock(B)
370 * spin_lock(B)
371 * write_lock(A)
372 */
373static void rlock_ABBA1(void)
374{
375 RL(X1);
376 L(Y1);
377 U(Y1);
378 RU(X1);
379
380 L(Y1);
381 WL(X1);
382 WU(X1);
383 U(Y1); // should fail
384}
385
386static void rwsem_ABBA1(void)
387{
388 RSL(X1);
389 ML(Y1);
390 MU(Y1);
391 RSU(X1);
392
393 ML(Y1);
394 WSL(X1);
395 WSU(X1);
396 MU(Y1); // should fail
397}
398
d4f200e5
BF		 399/*
400 * read_lock(A)
401 * spin_lock(B)
402 * spin_lock(B)
403 * write_lock(A)
404 *
405 * This test case is aimed at poking whether the chain cache prevents us from
406 * detecting a read-lock/lock-write deadlock: if the chain cache doesn't differ
407 * read/write locks, the following case may happen
408 *
409 * { read_lock(A)->lock(B) dependency exists }
410 *
411 * P0:
412 * lock(B);
413 * read_lock(A);
414 *
415 * { Not a deadlock, B -> A is added in the chain cache }
416 *
417 * P1:
418 * lock(B);
419 * write_lock(A);
420 *
421 * { B->A found in chain cache, not reported as a deadlock }
422 *
423 */
424static void rlock_chaincache_ABBA1(void)
425{
426 RL(X1);
427 L(Y1);
428 U(Y1);
429 RU(X1);
430
431 L(Y1);
432 RL(X1);
433 RU(X1);
434 U(Y1);
435
436 L(Y1);
437 WL(X1);
438 WU(X1);
439 U(Y1); // should fail
440}
441
e9149858
PZ		 442/*
443 * read_lock(A)
444 * spin_lock(B)
445 * spin_lock(B)
446 * read_lock(A)
447 */
448static void rlock_ABBA2(void)
449{
450 RL(X1);
451 L(Y1);
452 U(Y1);
453 RU(X1);
454
455 L(Y1);
456 RL(X1);
457 RU(X1);
458 U(Y1); // should NOT fail
459}
460
461static void rwsem_ABBA2(void)
462{
463 RSL(X1);
464 ML(Y1);
465 MU(Y1);
466 RSU(X1);
467
468 ML(Y1);
469 RSL(X1);
470 RSU(X1);
471 MU(Y1); // should fail
472}
473
474
475/*
476 * write_lock(A)
477 * spin_lock(B)
478 * spin_lock(B)
479 * write_lock(A)
480 */
481static void rlock_ABBA3(void)
482{
483 WL(X1);
484 L(Y1);
485 U(Y1);
486 WU(X1);
487
488 L(Y1);
489 WL(X1);
490 WU(X1);
491 U(Y1); // should fail
492}
493
494static void rwsem_ABBA3(void)
495{
496 WSL(X1);
497 ML(Y1);
498 MU(Y1);
499 WSU(X1);
500
501 ML(Y1);
502 WSL(X1);
503 WSU(X1);
504 MU(Y1); // should fail
505}
506
cae2ed9a
IM		 507/*
508 * ABBA deadlock:
509 */
510
511#define E() \
512 \
513 LOCK_UNLOCK_2(A, B); \
514 LOCK_UNLOCK_2(B, A); /* fail */
515
516/*
517 * 6 testcases:
518 */
519#include "locking-selftest-spin.h"
520GENERATE_TESTCASE(ABBA_spin)
521#include "locking-selftest-wlock.h"
522GENERATE_TESTCASE(ABBA_wlock)
523#include "locking-selftest-rlock.h"
524GENERATE_TESTCASE(ABBA_rlock)
525#include "locking-selftest-mutex.h"
526GENERATE_TESTCASE(ABBA_mutex)
527#include "locking-selftest-wsem.h"
528GENERATE_TESTCASE(ABBA_wsem)
529#include "locking-selftest-rsem.h"
530GENERATE_TESTCASE(ABBA_rsem)
531
018956d6
PZ		 532#ifdef CONFIG_RT_MUTEXES
533#include "locking-selftest-rtmutex.h"
534GENERATE_TESTCASE(ABBA_rtmutex);
535#endif
536
cae2ed9a
IM		 537#undef E
538
539/*
540 * AB BC CA deadlock:
541 */
542
543#define E() \
544 \
545 LOCK_UNLOCK_2(A, B); \
546 LOCK_UNLOCK_2(B, C); \
547 LOCK_UNLOCK_2(C, A); /* fail */
548
549/*
550 * 6 testcases:
551 */
552#include "locking-selftest-spin.h"
553GENERATE_TESTCASE(ABBCCA_spin)
554#include "locking-selftest-wlock.h"
555GENERATE_TESTCASE(ABBCCA_wlock)
556#include "locking-selftest-rlock.h"
557GENERATE_TESTCASE(ABBCCA_rlock)
558#include "locking-selftest-mutex.h"
559GENERATE_TESTCASE(ABBCCA_mutex)
560#include "locking-selftest-wsem.h"
561GENERATE_TESTCASE(ABBCCA_wsem)
562#include "locking-selftest-rsem.h"
563GENERATE_TESTCASE(ABBCCA_rsem)
564
018956d6
PZ		 565#ifdef CONFIG_RT_MUTEXES
566#include "locking-selftest-rtmutex.h"
567GENERATE_TESTCASE(ABBCCA_rtmutex);
568#endif
569
cae2ed9a
IM		 570#undef E
571
572/*
573 * AB CA BC deadlock:
574 */
575
576#define E() \
577 \
578 LOCK_UNLOCK_2(A, B); \
579 LOCK_UNLOCK_2(C, A); \
580 LOCK_UNLOCK_2(B, C); /* fail */
581
582/*
583 * 6 testcases:
584 */
585#include "locking-selftest-spin.h"
586GENERATE_TESTCASE(ABCABC_spin)
587#include "locking-selftest-wlock.h"
588GENERATE_TESTCASE(ABCABC_wlock)
589#include "locking-selftest-rlock.h"
590GENERATE_TESTCASE(ABCABC_rlock)
591#include "locking-selftest-mutex.h"
592GENERATE_TESTCASE(ABCABC_mutex)
593#include "locking-selftest-wsem.h"
594GENERATE_TESTCASE(ABCABC_wsem)
595#include "locking-selftest-rsem.h"
596GENERATE_TESTCASE(ABCABC_rsem)
597
018956d6
PZ		 598#ifdef CONFIG_RT_MUTEXES
599#include "locking-selftest-rtmutex.h"
600GENERATE_TESTCASE(ABCABC_rtmutex);
601#endif
602
cae2ed9a
IM		 603#undef E
604
605/*
606 * AB BC CD DA deadlock:
607 */
608
609#define E() \
610 \
611 LOCK_UNLOCK_2(A, B); \
612 LOCK_UNLOCK_2(B, C); \
613 LOCK_UNLOCK_2(C, D); \
614 LOCK_UNLOCK_2(D, A); /* fail */
615
616/*
617 * 6 testcases:
618 */
619#include "locking-selftest-spin.h"
620GENERATE_TESTCASE(ABBCCDDA_spin)
621#include "locking-selftest-wlock.h"
622GENERATE_TESTCASE(ABBCCDDA_wlock)
623#include "locking-selftest-rlock.h"
624GENERATE_TESTCASE(ABBCCDDA_rlock)
625#include "locking-selftest-mutex.h"
626GENERATE_TESTCASE(ABBCCDDA_mutex)
627#include "locking-selftest-wsem.h"
628GENERATE_TESTCASE(ABBCCDDA_wsem)
629#include "locking-selftest-rsem.h"
630GENERATE_TESTCASE(ABBCCDDA_rsem)
631
018956d6
PZ		 632#ifdef CONFIG_RT_MUTEXES
633#include "locking-selftest-rtmutex.h"
634GENERATE_TESTCASE(ABBCCDDA_rtmutex);
635#endif
636
cae2ed9a
IM		 637#undef E
638
639/*
640 * AB CD BD DA deadlock:
641 */
642#define E() \
643 \
644 LOCK_UNLOCK_2(A, B); \
645 LOCK_UNLOCK_2(C, D); \
646 LOCK_UNLOCK_2(B, D); \
647 LOCK_UNLOCK_2(D, A); /* fail */
648
649/*
650 * 6 testcases:
651 */
652#include "locking-selftest-spin.h"
653GENERATE_TESTCASE(ABCDBDDA_spin)
654#include "locking-selftest-wlock.h"
655GENERATE_TESTCASE(ABCDBDDA_wlock)
656#include "locking-selftest-rlock.h"
657GENERATE_TESTCASE(ABCDBDDA_rlock)
658#include "locking-selftest-mutex.h"
659GENERATE_TESTCASE(ABCDBDDA_mutex)
660#include "locking-selftest-wsem.h"
661GENERATE_TESTCASE(ABCDBDDA_wsem)
662#include "locking-selftest-rsem.h"
663GENERATE_TESTCASE(ABCDBDDA_rsem)
664
018956d6
PZ		 665#ifdef CONFIG_RT_MUTEXES
666#include "locking-selftest-rtmutex.h"
667GENERATE_TESTCASE(ABCDBDDA_rtmutex);
668#endif
669
cae2ed9a
IM		 670#undef E
671
672/*
673 * AB CD BC DA deadlock:
674 */
675#define E() \
676 \
677 LOCK_UNLOCK_2(A, B); \
678 LOCK_UNLOCK_2(C, D); \
679 LOCK_UNLOCK_2(B, C); \
680 LOCK_UNLOCK_2(D, A); /* fail */
681
682/*
683 * 6 testcases:
684 */
685#include "locking-selftest-spin.h"
686GENERATE_TESTCASE(ABCDBCDA_spin)
687#include "locking-selftest-wlock.h"
688GENERATE_TESTCASE(ABCDBCDA_wlock)
689#include "locking-selftest-rlock.h"
690GENERATE_TESTCASE(ABCDBCDA_rlock)
691#include "locking-selftest-mutex.h"
692GENERATE_TESTCASE(ABCDBCDA_mutex)
693#include "locking-selftest-wsem.h"
694GENERATE_TESTCASE(ABCDBCDA_wsem)
695#include "locking-selftest-rsem.h"
696GENERATE_TESTCASE(ABCDBCDA_rsem)
697
018956d6
PZ		 698#ifdef CONFIG_RT_MUTEXES
699#include "locking-selftest-rtmutex.h"
700GENERATE_TESTCASE(ABCDBCDA_rtmutex);
701#endif
702
cae2ed9a
IM		 703#undef E
704
705/*
706 * Double unlock:
707 */
708#define E() \
709 \
710 LOCK(A); \
711 UNLOCK(A); \
712 UNLOCK(A); /* fail */
713
714/*
715 * 6 testcases:
716 */
717#include "locking-selftest-spin.h"
718GENERATE_TESTCASE(double_unlock_spin)
719#include "locking-selftest-wlock.h"
720GENERATE_TESTCASE(double_unlock_wlock)
721#include "locking-selftest-rlock.h"
722GENERATE_TESTCASE(double_unlock_rlock)
723#include "locking-selftest-mutex.h"
724GENERATE_TESTCASE(double_unlock_mutex)
725#include "locking-selftest-wsem.h"
726GENERATE_TESTCASE(double_unlock_wsem)
727#include "locking-selftest-rsem.h"
728GENERATE_TESTCASE(double_unlock_rsem)
729
018956d6
PZ		 730#ifdef CONFIG_RT_MUTEXES
731#include "locking-selftest-rtmutex.h"
732GENERATE_TESTCASE(double_unlock_rtmutex);
733#endif
734
cae2ed9a
IM		 735#undef E
736
cae2ed9a
IM		 737/*
738 * initializing a held lock:
739 */
740#define E() \
741 \
742 LOCK(A); \
743 INIT(A); /* fail */
744
745/*
746 * 6 testcases:
747 */
748#include "locking-selftest-spin.h"
749GENERATE_TESTCASE(init_held_spin)
750#include "locking-selftest-wlock.h"
751GENERATE_TESTCASE(init_held_wlock)
752#include "locking-selftest-rlock.h"
753GENERATE_TESTCASE(init_held_rlock)
754#include "locking-selftest-mutex.h"
755GENERATE_TESTCASE(init_held_mutex)
756#include "locking-selftest-wsem.h"
757GENERATE_TESTCASE(init_held_wsem)
758#include "locking-selftest-rsem.h"
759GENERATE_TESTCASE(init_held_rsem)
760
018956d6
PZ		 761#ifdef CONFIG_RT_MUTEXES
762#include "locking-selftest-rtmutex.h"
763GENERATE_TESTCASE(init_held_rtmutex);
764#endif
765
cae2ed9a
IM		 766#undef E
767
768/*
769 * locking an irq-safe lock with irqs enabled:
770 */
771#define E1() \
772 \
773 IRQ_ENTER(); \
774 LOCK(A); \
775 UNLOCK(A); \
776 IRQ_EXIT();
777
778#define E2() \
779 \
780 LOCK(A); \
781 UNLOCK(A);
782
783/*
784 * Generate 24 testcases:
785 */
786#include "locking-selftest-spin-hardirq.h"
787GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin)
788
789#include "locking-selftest-rlock-hardirq.h"
790GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock)
791
792#include "locking-selftest-wlock-hardirq.h"
793GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock)
794
795#include "locking-selftest-spin-softirq.h"
796GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin)
797
798#include "locking-selftest-rlock-softirq.h"
799GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock)
800
801#include "locking-selftest-wlock-softirq.h"
802GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock)
803
804#undef E1
805#undef E2
806
807/*
808 * Enabling hardirqs with a softirq-safe lock held:
809 */
810#define E1() \
811 \
812 SOFTIRQ_ENTER(); \
813 LOCK(A); \
814 UNLOCK(A); \
815 SOFTIRQ_EXIT();
816
817#define E2() \
818 \
819 HARDIRQ_DISABLE(); \
820 LOCK(A); \
821 HARDIRQ_ENABLE(); \
822 UNLOCK(A);
823
824/*
825 * Generate 12 testcases:
826 */
827#include "locking-selftest-spin.h"
828GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin)
829
830#include "locking-selftest-wlock.h"
831GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock)
832
833#include "locking-selftest-rlock.h"
834GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock)
835
836#undef E1
837#undef E2
838
839/*
840 * Enabling irqs with an irq-safe lock held:
841 */
842#define E1() \
843 \
844 IRQ_ENTER(); \
845 LOCK(A); \
846 UNLOCK(A); \
847 IRQ_EXIT();
848
849#define E2() \
850 \
851 IRQ_DISABLE(); \
852 LOCK(A); \
853 IRQ_ENABLE(); \
854 UNLOCK(A);
855
856/*
857 * Generate 24 testcases:
858 */
859#include "locking-selftest-spin-hardirq.h"
860GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin)
861
862#include "locking-selftest-rlock-hardirq.h"
863GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock)
864
865#include "locking-selftest-wlock-hardirq.h"
866GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock)
867
868#include "locking-selftest-spin-softirq.h"
869GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin)
870
871#include "locking-selftest-rlock-softirq.h"
872GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock)
873
874#include "locking-selftest-wlock-softirq.h"
875GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)
876
877#undef E1
878#undef E2
879
880/*
881 * Acquiring a irq-unsafe lock while holding an irq-safe-lock:
882 */
883#define E1() \
884 \
885 LOCK(A); \
886 LOCK(B); \
887 UNLOCK(B); \
888 UNLOCK(A); \
889
890#define E2() \
891 \
892 LOCK(B); \
893 UNLOCK(B);
894
895#define E3() \
896 \
897 IRQ_ENTER(); \
898 LOCK(A); \
899 UNLOCK(A); \
900 IRQ_EXIT();
901
902/*
903 * Generate 36 testcases:
904 */
905#include "locking-selftest-spin-hardirq.h"
906GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin)
907
908#include "locking-selftest-rlock-hardirq.h"
909GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock)
910
911#include "locking-selftest-wlock-hardirq.h"
912GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock)
913
914#include "locking-selftest-spin-softirq.h"
915GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin)
916
917#include "locking-selftest-rlock-softirq.h"
918GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock)
919
920#include "locking-selftest-wlock-softirq.h"
921GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)
922
923#undef E1
924#undef E2
925#undef E3
926
927/*
928 * If a lock turns into softirq-safe, but earlier it took
929 * a softirq-unsafe lock:
930 */
931
932#define E1() \
933 IRQ_DISABLE(); \
934 LOCK(A); \
935 LOCK(B); \
936 UNLOCK(B); \
937 UNLOCK(A); \
938 IRQ_ENABLE();
939
940#define E2() \
941 LOCK(B); \
942 UNLOCK(B);
943
944#define E3() \
945 IRQ_ENTER(); \
946 LOCK(A); \
947 UNLOCK(A); \
948 IRQ_EXIT();
949
950/*
951 * Generate 36 testcases:
952 */
953#include "locking-selftest-spin-hardirq.h"
954GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin)
955
956#include "locking-selftest-rlock-hardirq.h"
957GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock)
958
959#include "locking-selftest-wlock-hardirq.h"
960GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock)
961
962#include "locking-selftest-spin-softirq.h"
963GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin)
964
965#include "locking-selftest-rlock-softirq.h"
966GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock)
967
968#include "locking-selftest-wlock-softirq.h"
969GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock)
970
971#undef E1
972#undef E2
973#undef E3
974
975/*
976 * read-lock / write-lock irq inversion.
977 *
978 * Deadlock scenario:
979 *
980 * CPU#1 is at #1, i.e. it has write-locked A, but has not
981 * taken B yet.
982 *
983 * CPU#2 is at #2, i.e. it has locked B.
984 *
985 * Hardirq hits CPU#2 at point #2 and is trying to read-lock A.
986 *
987 * The deadlock occurs because CPU#1 will spin on B, and CPU#2
988 * will spin on A.
989 */
990
991#define E1() \
992 \
993 IRQ_DISABLE(); \
994 WL(A); \
995 LOCK(B); \
996 UNLOCK(B); \
997 WU(A); \
998 IRQ_ENABLE();
999
1000#define E2() \
1001 \
1002 LOCK(B); \
1003 UNLOCK(B);
1004
1005#define E3() \
1006 \
1007 IRQ_ENTER(); \
1008 RL(A); \
1009 RU(A); \
1010 IRQ_EXIT();
1011
1012/*
1013 * Generate 36 testcases:
1014 */
1015#include "locking-selftest-spin-hardirq.h"
1016GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin)
1017
1018#include "locking-selftest-rlock-hardirq.h"
1019GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock)
1020
1021#include "locking-selftest-wlock-hardirq.h"
1022GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock)
1023
1024#include "locking-selftest-spin-softirq.h"
1025GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin)
1026
1027#include "locking-selftest-rlock-softirq.h"
1028GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock)
1029
1030#include "locking-selftest-wlock-softirq.h"
1031GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock)
1032
1033#undef E1
1034#undef E2
1035#undef E3
1036
8ef7ca75
BF		 1037/*
1038 * write-read / write-read / write-read deadlock even if read is recursive
1039 */
1040
1041#define E1() \
1042 \
1043 WL(X1); \
1044 RL(Y1); \
1045 RU(Y1); \
1046 WU(X1);
1047
1048#define E2() \
1049 \
1050 WL(Y1); \
1051 RL(Z1); \
1052 RU(Z1); \
1053 WU(Y1);
1054
1055#define E3() \
1056 \
1057 WL(Z1); \
1058 RL(X1); \
1059 RU(X1); \
1060 WU(Z1);
1061
1062#include "locking-selftest-rlock.h"
1063GENERATE_PERMUTATIONS_3_EVENTS(W1R2_W2R3_W3R1)
1064
1065#undef E1
1066#undef E2
1067#undef E3
1068
1069/*
1070 * write-write / read-read / write-read deadlock even if read is recursive
1071 */
1072
1073#define E1() \
1074 \
1075 WL(X1); \
1076 WL(Y1); \
1077 WU(Y1); \
1078 WU(X1);
1079
1080#define E2() \
1081 \
1082 RL(Y1); \
1083 RL(Z1); \
1084 RU(Z1); \
1085 RU(Y1);
1086
1087#define E3() \
1088 \
1089 WL(Z1); \
1090 RL(X1); \
1091 RU(X1); \
1092 WU(Z1);
1093
1094#include "locking-selftest-rlock.h"
1095GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_W3R1)
1096
1097#undef E1
1098#undef E2
1099#undef E3
1100
1101/*
1102 * write-write / read-read / read-write is not deadlock when read is recursive
1103 */
1104
1105#define E1() \
1106 \
1107 WL(X1); \
1108 WL(Y1); \
1109 WU(Y1); \
1110 WU(X1);
1111
1112#define E2() \
1113 \
1114 RL(Y1); \
1115 RL(Z1); \
1116 RU(Z1); \
1117 RU(Y1);
1118
1119#define E3() \
1120 \
1121 RL(Z1); \
1122 WL(X1); \
1123 WU(X1); \
1124 RU(Z1);
1125
1126#include "locking-selftest-rlock.h"
1127GENERATE_PERMUTATIONS_3_EVENTS(W1R2_R2R3_W3W1)
1128
1129#undef E1
1130#undef E2
1131#undef E3
1132
1133/*
1134 * write-read / read-read / write-write is not deadlock when read is recursive
1135 */
1136
1137#define E1() \
1138 \
1139 WL(X1); \
1140 RL(Y1); \
1141 RU(Y1); \
1142 WU(X1);
1143
1144#define E2() \
1145 \
1146 RL(Y1); \
1147 RL(Z1); \
1148 RU(Z1); \
1149 RU(Y1);
1150
1151#define E3() \
1152 \
1153 WL(Z1); \
1154 WL(X1); \
1155 WU(X1); \
1156 WU(Z1);
1157
1158#include "locking-selftest-rlock.h"
1159GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_R3W1)
1160
1161#undef E1
1162#undef E2
1163#undef E3
cae2ed9a
IM		 1164/*
1165 * read-lock / write-lock recursion that is actually safe.
1166 */
1167
1168#define E1() \
1169 \
1170 IRQ_DISABLE(); \
1171 WL(A); \
1172 WU(A); \
1173 IRQ_ENABLE();
1174
1175#define E2() \
1176 \
1177 RL(A); \
1178 RU(A); \
1179
1180#define E3() \
1181 \
1182 IRQ_ENTER(); \
31e0d747 1183 LOCK(A); \
cae2ed9a
IM		 1184 L(B); \
1185 U(B); \
31e0d747 1186 UNLOCK(A); \
cae2ed9a
IM		 1187 IRQ_EXIT();
1188
1189/*
31e0d747 1190 * Generate 24 testcases:
cae2ed9a
IM		 1191 */
1192#include "locking-selftest-hardirq.h"
31e0d747
BF		 1193#include "locking-selftest-rlock.h"
1194GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_rlock)
1195
1196#include "locking-selftest-wlock.h"
1197GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_wlock)
cae2ed9a
IM		 1198
1199#include "locking-selftest-softirq.h"
31e0d747
BF		 1200#include "locking-selftest-rlock.h"
1201GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_rlock)
1202
1203#include "locking-selftest-wlock.h"
1204GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_wlock)
cae2ed9a
IM		 1205
1206#undef E1
1207#undef E2
1208#undef E3
1209
1210/*
1211 * read-lock / write-lock recursion that is unsafe.
1212 */
1213
1214#define E1() \
1215 \
1216 IRQ_DISABLE(); \
1217 L(B); \
31e0d747
BF		 1218 LOCK(A); \
1219 UNLOCK(A); \
cae2ed9a
IM		 1220 U(B); \
1221 IRQ_ENABLE();
1222
1223#define E2() \
1224 \
1225 RL(A); \
1226 RU(A); \
1227
1228#define E3() \
1229 \
1230 IRQ_ENTER(); \
1231 L(B); \
1232 U(B); \
1233 IRQ_EXIT();
1234
1235/*
31e0d747 1236 * Generate 24 testcases:
cae2ed9a
IM		 1237 */
1238#include "locking-selftest-hardirq.h"
31e0d747
BF		 1239#include "locking-selftest-rlock.h"
1240GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_rlock)
1241
1242#include "locking-selftest-wlock.h"
1243GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_wlock)
cae2ed9a
IM		 1244
1245#include "locking-selftest-softirq.h"
31e0d747
BF		 1246#include "locking-selftest-rlock.h"
1247GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_rlock)
1248
1249#include "locking-selftest-wlock.h"
1250GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_wlock)
cae2ed9a 1251
96a16f45
BF		 1252#undef E1
1253#undef E2
1254#undef E3
1255/*
1256 * read-lock / write-lock recursion that is unsafe.
1257 *
1258 * A is a ENABLED_*_READ lock
1259 * B is a USED_IN_*_READ lock
1260 *
1261 * read_lock(A);
1262 * write_lock(B);
1263 * <interrupt>
1264 * read_lock(B);
1265 * write_lock(A); // if this one is read_lock(), no deadlock
1266 */
1267
1268#define E1() \
1269 \
1270 IRQ_DISABLE(); \
1271 WL(B); \
1272 LOCK(A); \
1273 UNLOCK(A); \
1274 WU(B); \
1275 IRQ_ENABLE();
1276
1277#define E2() \
1278 \
1279 RL(A); \
1280 RU(A); \
1281
1282#define E3() \
1283 \
1284 IRQ_ENTER(); \
1285 RL(B); \
1286 RU(B); \
1287 IRQ_EXIT();
1288
1289/*
1290 * Generate 24 testcases:
1291 */
1292#include "locking-selftest-hardirq.h"
1293#include "locking-selftest-rlock.h"
1294GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_rlock)
1295
1296#include "locking-selftest-wlock.h"
1297GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_wlock)
1298
1299#include "locking-selftest-softirq.h"
1300#include "locking-selftest-rlock.h"
1301GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_rlock)
1302
1303#include "locking-selftest-wlock.h"
1304GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_wlock)
1305
cae2ed9a
IM		 1306#ifdef CONFIG_DEBUG_LOCK_ALLOC
1307# define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map)
1308# define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map)
1309# define I_MUTEX(x) lockdep_reset_lock(&mutex_##x.dep_map)
1310# define I_RWSEM(x) lockdep_reset_lock(&rwsem_##x.dep_map)
1de99445 1311# define I_WW(x) lockdep_reset_lock(&x.dep_map)
018956d6
PZ		 1312#ifdef CONFIG_RT_MUTEXES
1313# define I_RTMUTEX(x) lockdep_reset_lock(&rtmutex_##x.dep_map)
1314#endif
cae2ed9a
IM		 1315#else
1316# define I_SPINLOCK(x)
1317# define I_RWLOCK(x)
1318# define I_MUTEX(x)
1319# define I_RWSEM(x)
1de99445 1320# define I_WW(x)
cae2ed9a
IM		 1321#endif
1322
018956d6
PZ		 1323#ifndef I_RTMUTEX
1324# define I_RTMUTEX(x)
1325#endif
1326
1327#ifdef CONFIG_RT_MUTEXES
1328#define I2_RTMUTEX(x) rt_mutex_init(&rtmutex_##x)
1329#else
1330#define I2_RTMUTEX(x)
1331#endif
1332
cae2ed9a
IM		 1333#define I1(x) \
1334 do { \
1335 I_SPINLOCK(x); \
1336 I_RWLOCK(x); \
1337 I_MUTEX(x); \
1338 I_RWSEM(x); \
018956d6 1339 I_RTMUTEX(x); \
cae2ed9a
IM		 1340 } while (0)
1341
1342#define I2(x) \
1343 do { \
9fb1b90c 1344 raw_spin_lock_init(&lock_##x); \
cae2ed9a
IM		 1345 rwlock_init(&rwlock_##x); \
1346 mutex_init(&mutex_##x); \
1347 init_rwsem(&rwsem_##x); \
018956d6 1348 I2_RTMUTEX(x); \
cae2ed9a
IM		 1349 } while (0)
1350
1351static void reset_locks(void)
1352{
1353 local_irq_disable();
1de99445
ML		 1354 lockdep_free_key_range(&ww_lockdep.acquire_key, 1);
1355 lockdep_free_key_range(&ww_lockdep.mutex_key, 1);
1356
cae2ed9a
IM		 1357 I1(A); I1(B); I1(C); I1(D);
1358 I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2);
f3cf139e 1359 I_WW(t); I_WW(t2); I_WW(o.base); I_WW(o2.base); I_WW(o3.base);
cae2ed9a
IM		 1360 lockdep_reset();
1361 I2(A); I2(B); I2(C); I2(D);
1362 init_shared_classes();
1de99445 1363
f3cf139e 1364 ww_mutex_init(&o, &ww_lockdep); ww_mutex_init(&o2, &ww_lockdep); ww_mutex_init(&o3, &ww_lockdep);
1de99445
ML		 1365 memset(&t, 0, sizeof(t)); memset(&t2, 0, sizeof(t2));
1366 memset(&ww_lockdep.acquire_key, 0, sizeof(ww_lockdep.acquire_key));
1367 memset(&ww_lockdep.mutex_key, 0, sizeof(ww_lockdep.mutex_key));
cae2ed9a
IM		 1368 local_irq_enable();
1369}
1370
1371#undef I
1372
1373static int testcase_total;
1374static int testcase_successes;
1375static int expected_testcase_failures;
1376static int unexpected_testcase_failures;
1377
1378static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
1379{
1380 unsigned long saved_preempt_count = preempt_count();
cae2ed9a
IM		 1381
1382 WARN_ON(irqs_disabled());
1383
1384 testcase_fn();
1385 /*
1386 * Filter out expected failures:
1387 */
1388#ifndef CONFIG_PROVE_LOCKING
166989e3 1389 if (expected == FAILURE && debug_locks) {
1de99445 1390 expected_testcase_failures++;
25139409 1391 pr_cont("failed|");
166989e3
ML		 1392 }
1393 else
1394#endif
1395 if (debug_locks != expected) {
1de99445 1396 unexpected_testcase_failures++;
25139409 1397 pr_cont("FAILED|");
cae2ed9a
IM		 1398 } else {
1399 testcase_successes++;
25139409 1400 pr_cont(" ok |");
cae2ed9a
IM		 1401 }
1402 testcase_total++;
1403
1404 if (debug_locks_verbose)
25139409 1405 pr_cont(" lockclass mask: %x, debug_locks: %d, expected: %d\n",
cae2ed9a
IM		 1406 lockclass_mask, debug_locks, expected);
1407 /*
1408 * Some tests (e.g. double-unlock) might corrupt the preemption
1409 * count, so restore it:
1410 */
4a2b4b22 1411 preempt_count_set(saved_preempt_count);
cae2ed9a
IM		 1412#ifdef CONFIG_TRACE_IRQFLAGS
1413 if (softirq_count())
1414 current->softirqs_enabled = 0;
1415 else
1416 current->softirqs_enabled = 1;
1417#endif
1418
1419 reset_locks();
1420}
1421
018956d6
PZ		 1422#ifdef CONFIG_RT_MUTEXES
1423#define dotest_rt(fn, e, m) dotest((fn), (e), (m))
1424#else
1425#define dotest_rt(fn, e, m)
1426#endif
1427
cae2ed9a
IM		 1428static inline void print_testname(const char *testname)
1429{
1430 printk("%33s:", testname);
1431}
1432
1433#define DO_TESTCASE_1(desc, name, nr) \
1434 print_testname(desc"/"#nr); \
1435 dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
25139409 1436 pr_cont("\n");
cae2ed9a
IM		 1437
1438#define DO_TESTCASE_1B(desc, name, nr) \
1439 print_testname(desc"/"#nr); \
1440 dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
25139409 1441 pr_cont("\n");
cae2ed9a 1442
8ef7ca75
BF		 1443#define DO_TESTCASE_1RR(desc, name, nr) \
1444 print_testname(desc"/"#nr); \
1445 pr_cont(" |"); \
1446 dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
1447 pr_cont("\n");
1448
1449#define DO_TESTCASE_1RRB(desc, name, nr) \
1450 print_testname(desc"/"#nr); \
1451 pr_cont(" |"); \
1452 dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
1453 pr_cont("\n");
1454
1455
cae2ed9a
IM		 1456#define DO_TESTCASE_3(desc, name, nr) \
1457 print_testname(desc"/"#nr); \
1458 dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \
1459 dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
1460 dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
25139409 1461 pr_cont("\n");
cae2ed9a
IM		 1462
1463#define DO_TESTCASE_3RW(desc, name, nr) \
1464 print_testname(desc"/"#nr); \
1465 dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\
1466 dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
1467 dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
25139409 1468 pr_cont("\n");
cae2ed9a 1469
31e0d747
BF		 1470#define DO_TESTCASE_2RW(desc, name, nr) \
1471 print_testname(desc"/"#nr); \
1472 pr_cont(" |"); \
1473 dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
1474 dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
1475 pr_cont("\n");
1476
1477#define DO_TESTCASE_2x2RW(desc, name, nr) \
1478 DO_TESTCASE_2RW("hard-"desc, name##_hard, nr) \
1479 DO_TESTCASE_2RW("soft-"desc, name##_soft, nr) \
1480
1481#define DO_TESTCASE_6x2x2RW(desc, name) \
1482 DO_TESTCASE_2x2RW(desc, name, 123); \
1483 DO_TESTCASE_2x2RW(desc, name, 132); \
1484 DO_TESTCASE_2x2RW(desc, name, 213); \
1485 DO_TESTCASE_2x2RW(desc, name, 231); \
1486 DO_TESTCASE_2x2RW(desc, name, 312); \
1487 DO_TESTCASE_2x2RW(desc, name, 321);
1488
cae2ed9a
IM		 1489#define DO_TESTCASE_6(desc, name) \
1490 print_testname(desc); \
1491 dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \
1492 dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \
1493 dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK); \
1494 dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \
1495 dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \
1496 dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \
018956d6 1497 dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \
25139409 1498 pr_cont("\n");
cae2ed9a
IM		 1499
1500#define DO_TESTCASE_6_SUCCESS(desc, name) \
1501 print_testname(desc); \
1502 dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN); \
1503 dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK); \
1504 dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \
1505 dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX); \
1506 dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM); \
1507 dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM); \
018956d6 1508 dotest_rt(name##_rtmutex, SUCCESS, LOCKTYPE_RTMUTEX); \
25139409 1509 pr_cont("\n");
cae2ed9a
IM		 1510
1511/*
1512 * 'read' variant: rlocks must not trigger.
1513 */
1514#define DO_TESTCASE_6R(desc, name) \
1515 print_testname(desc); \
1516 dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \
1517 dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \
1518 dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \
1519 dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \
1520 dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \
1521 dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \
018956d6 1522 dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \
25139409 1523 pr_cont("\n");
cae2ed9a
IM		 1524
1525#define DO_TESTCASE_2I(desc, name, nr) \
1526 DO_TESTCASE_1("hard-"desc, name##_hard, nr); \
1527 DO_TESTCASE_1("soft-"desc, name##_soft, nr);
1528
1529#define DO_TESTCASE_2IB(desc, name, nr) \
1530 DO_TESTCASE_1B("hard-"desc, name##_hard, nr); \
1531 DO_TESTCASE_1B("soft-"desc, name##_soft, nr);
1532
1533#define DO_TESTCASE_6I(desc, name, nr) \
1534 DO_TESTCASE_3("hard-"desc, name##_hard, nr); \
1535 DO_TESTCASE_3("soft-"desc, name##_soft, nr);
1536
1537#define DO_TESTCASE_6IRW(desc, name, nr) \
1538 DO_TESTCASE_3RW("hard-"desc, name##_hard, nr); \
1539 DO_TESTCASE_3RW("soft-"desc, name##_soft, nr);
1540
1541#define DO_TESTCASE_2x3(desc, name) \
1542 DO_TESTCASE_3(desc, name, 12); \
1543 DO_TESTCASE_3(desc, name, 21);
1544
1545#define DO_TESTCASE_2x6(desc, name) \
1546 DO_TESTCASE_6I(desc, name, 12); \
1547 DO_TESTCASE_6I(desc, name, 21);
1548
1549#define DO_TESTCASE_6x2(desc, name) \
1550 DO_TESTCASE_2I(desc, name, 123); \
1551 DO_TESTCASE_2I(desc, name, 132); \
1552 DO_TESTCASE_2I(desc, name, 213); \
1553 DO_TESTCASE_2I(desc, name, 231); \
1554 DO_TESTCASE_2I(desc, name, 312); \
1555 DO_TESTCASE_2I(desc, name, 321);
1556
1557#define DO_TESTCASE_6x2B(desc, name) \
1558 DO_TESTCASE_2IB(desc, name, 123); \
1559 DO_TESTCASE_2IB(desc, name, 132); \
1560 DO_TESTCASE_2IB(desc, name, 213); \
1561 DO_TESTCASE_2IB(desc, name, 231); \
1562 DO_TESTCASE_2IB(desc, name, 312); \
1563 DO_TESTCASE_2IB(desc, name, 321);
1564
8ef7ca75
BF		 1565#define DO_TESTCASE_6x1RR(desc, name) \
1566 DO_TESTCASE_1RR(desc, name, 123); \
1567 DO_TESTCASE_1RR(desc, name, 132); \
1568 DO_TESTCASE_1RR(desc, name, 213); \
1569 DO_TESTCASE_1RR(desc, name, 231); \
1570 DO_TESTCASE_1RR(desc, name, 312); \
1571 DO_TESTCASE_1RR(desc, name, 321);
1572
1573#define DO_TESTCASE_6x1RRB(desc, name) \
1574 DO_TESTCASE_1RRB(desc, name, 123); \
1575 DO_TESTCASE_1RRB(desc, name, 132); \
1576 DO_TESTCASE_1RRB(desc, name, 213); \
1577 DO_TESTCASE_1RRB(desc, name, 231); \
1578 DO_TESTCASE_1RRB(desc, name, 312); \
1579 DO_TESTCASE_1RRB(desc, name, 321);
1580
cae2ed9a
IM		 1581#define DO_TESTCASE_6x6(desc, name) \
1582 DO_TESTCASE_6I(desc, name, 123); \
1583 DO_TESTCASE_6I(desc, name, 132); \
1584 DO_TESTCASE_6I(desc, name, 213); \
1585 DO_TESTCASE_6I(desc, name, 231); \
1586 DO_TESTCASE_6I(desc, name, 312); \
1587 DO_TESTCASE_6I(desc, name, 321);
1588
1589#define DO_TESTCASE_6x6RW(desc, name) \
1590 DO_TESTCASE_6IRW(desc, name, 123); \
1591 DO_TESTCASE_6IRW(desc, name, 132); \
1592 DO_TESTCASE_6IRW(desc, name, 213); \
1593 DO_TESTCASE_6IRW(desc, name, 231); \
1594 DO_TESTCASE_6IRW(desc, name, 312); \
1595 DO_TESTCASE_6IRW(desc, name, 321);
1596
1de99445
ML		 1597static void ww_test_fail_acquire(void)
1598{
1599 int ret;
1600
1601 WWAI(&t);
1602 t.stamp++;
1603
1604 ret = WWL(&o, &t);
1605
1606 if (WARN_ON(!o.ctx) ||
1607 WARN_ON(ret))
1608 return;
1609
1610 /* No lockdep test, pure API */
1611 ret = WWL(&o, &t);
1612 WARN_ON(ret != -EALREADY);
1613
1614 ret = WWT(&o);
1615 WARN_ON(ret);
1616
1617 t2 = t;
1618 t2.stamp++;
1619 ret = WWL(&o, &t2);
1620 WARN_ON(ret != -EDEADLK);
1621 WWU(&o);
1622
1623 if (WWT(&o))
1624 WWU(&o);
1625#ifdef CONFIG_DEBUG_LOCK_ALLOC
1626 else
1627 DEBUG_LOCKS_WARN_ON(1);
1628#endif
1629}
1630
2fe3d4b1
ML		 1631static void ww_test_normal(void)
1632{
1633 int ret;
1634
1635 WWAI(&t);
1636
1637 /*
1638 * None of the ww_mutex codepaths should be taken in the 'normal'
1639 * mutex calls. The easiest way to verify this is by using the
1640 * normal mutex calls, and making sure o.ctx is unmodified.
1641 */
1642
1643 /* mutex_lock (and indirectly, mutex_lock_nested) */
1644 o.ctx = (void *)~0UL;
1645 mutex_lock(&o.base);
1646 mutex_unlock(&o.base);
1647 WARN_ON(o.ctx != (void *)~0UL);
1648
1649 /* mutex_lock_interruptible (and *_nested) */
1650 o.ctx = (void *)~0UL;
1651 ret = mutex_lock_interruptible(&o.base);
1652 if (!ret)
1653 mutex_unlock(&o.base);
1654 else
1655 WARN_ON(1);
1656 WARN_ON(o.ctx != (void *)~0UL);
1657
1658 /* mutex_lock_killable (and *_nested) */
1659 o.ctx = (void *)~0UL;
1660 ret = mutex_lock_killable(&o.base);
1661 if (!ret)
1662 mutex_unlock(&o.base);
1663 else
1664 WARN_ON(1);
1665 WARN_ON(o.ctx != (void *)~0UL);
1666
1667 /* trylock, succeeding */
1668 o.ctx = (void *)~0UL;
1669 ret = mutex_trylock(&o.base);
1670 WARN_ON(!ret);
1671 if (ret)
1672 mutex_unlock(&o.base);
1673 else
1674 WARN_ON(1);
1675 WARN_ON(o.ctx != (void *)~0UL);
1676
1677 /* trylock, failing */
1678 o.ctx = (void *)~0UL;
1679 mutex_lock(&o.base);
1680 ret = mutex_trylock(&o.base);
1681 WARN_ON(ret);
1682 mutex_unlock(&o.base);
1683 WARN_ON(o.ctx != (void *)~0UL);
1684
1685 /* nest_lock */
1686 o.ctx = (void *)~0UL;
1687 mutex_lock_nest_lock(&o.base, &t);
1688 mutex_unlock(&o.base);
1689 WARN_ON(o.ctx != (void *)~0UL);
1690}
1691
1de99445
ML		 1692static void ww_test_two_contexts(void)
1693{
1694 WWAI(&t);
1695 WWAI(&t2);
1696}
1697
1698static void ww_test_diff_class(void)
1699{
1700 WWAI(&t);
1701#ifdef CONFIG_DEBUG_MUTEXES
1702 t.ww_class = NULL;
1703#endif
1704 WWL(&o, &t);
1705}
1706
1707static void ww_test_context_done_twice(void)
1708{
1709 WWAI(&t);
1710 WWAD(&t);
1711 WWAD(&t);
1712 WWAF(&t);
1713}
1714
1715static void ww_test_context_unlock_twice(void)
1716{
1717 WWAI(&t);
1718 WWAD(&t);
1719 WWAF(&t);
1720 WWAF(&t);
1721}
1722
1723static void ww_test_context_fini_early(void)
1724{
1725 WWAI(&t);
1726 WWL(&o, &t);
1727 WWAD(&t);
1728 WWAF(&t);
1729}
1730
1731static void ww_test_context_lock_after_done(void)
1732{
1733 WWAI(&t);
1734 WWAD(&t);
1735 WWL(&o, &t);
1736}
1737
1738static void ww_test_object_unlock_twice(void)
1739{
1740 WWL1(&o);
1741 WWU(&o);
1742 WWU(&o);
1743}
1744
1745static void ww_test_object_lock_unbalanced(void)
1746{
1747 WWAI(&t);
1748 WWL(&o, &t);
1749 t.acquired = 0;
1750 WWU(&o);
1751 WWAF(&t);
1752}
1753
1754static void ww_test_object_lock_stale_context(void)
1755{
1756 WWAI(&t);
1757 o.ctx = &t2;
1758 WWL(&o, &t);
1759}
1760
f3cf139e
ML		 1761static void ww_test_edeadlk_normal(void)
1762{
1763 int ret;
1764
1765 mutex_lock(&o2.base);
1766 o2.ctx = &t2;
5facae4f 1767 mutex_release(&o2.base.dep_map, _THIS_IP_);
f3cf139e
ML		 1768
1769 WWAI(&t);
1770 t2 = t;
1771 t2.stamp--;
1772
1773 ret = WWL(&o, &t);
1774 WARN_ON(ret);
1775
1776 ret = WWL(&o2, &t);
1777 WARN_ON(ret != -EDEADLK);
1778
1779 o2.ctx = NULL;
1780 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1781 mutex_unlock(&o2.base);
1782 WWU(&o);
1783
1784 WWL(&o2, &t);
1785}
1786
1787static void ww_test_edeadlk_normal_slow(void)
1788{
1789 int ret;
1790
1791 mutex_lock(&o2.base);
5facae4f 1792 mutex_release(&o2.base.dep_map, _THIS_IP_);
f3cf139e
ML		 1793 o2.ctx = &t2;
1794
1795 WWAI(&t);
1796 t2 = t;
1797 t2.stamp--;
1798
1799 ret = WWL(&o, &t);
1800 WARN_ON(ret);
1801
1802 ret = WWL(&o2, &t);
1803 WARN_ON(ret != -EDEADLK);
1804
1805 o2.ctx = NULL;
1806 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1807 mutex_unlock(&o2.base);
1808 WWU(&o);
1809
1810 ww_mutex_lock_slow(&o2, &t);
1811}
1812
1813static void ww_test_edeadlk_no_unlock(void)
1814{
1815 int ret;
1816
1817 mutex_lock(&o2.base);
1818 o2.ctx = &t2;
5facae4f 1819 mutex_release(&o2.base.dep_map, _THIS_IP_);
f3cf139e
ML		 1820
1821 WWAI(&t);
1822 t2 = t;
1823 t2.stamp--;
1824
1825 ret = WWL(&o, &t);
1826 WARN_ON(ret);
1827
1828 ret = WWL(&o2, &t);
1829 WARN_ON(ret != -EDEADLK);
1830
1831 o2.ctx = NULL;
1832 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1833 mutex_unlock(&o2.base);
1834
1835 WWL(&o2, &t);
1836}
1837
1838static void ww_test_edeadlk_no_unlock_slow(void)
1839{
1840 int ret;
1841
1842 mutex_lock(&o2.base);
5facae4f 1843 mutex_release(&o2.base.dep_map, _THIS_IP_);
f3cf139e
ML		 1844 o2.ctx = &t2;
1845
1846 WWAI(&t);
1847 t2 = t;
1848 t2.stamp--;
1849
1850 ret = WWL(&o, &t);
1851 WARN_ON(ret);
1852
1853 ret = WWL(&o2, &t);
1854 WARN_ON(ret != -EDEADLK);
1855
1856 o2.ctx = NULL;
1857 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1858 mutex_unlock(&o2.base);
1859
1860 ww_mutex_lock_slow(&o2, &t);
1861}
1862
1863static void ww_test_edeadlk_acquire_more(void)
1864{
1865 int ret;
1866
1867 mutex_lock(&o2.base);
5facae4f 1868 mutex_release(&o2.base.dep_map, _THIS_IP_);
f3cf139e
ML		 1869 o2.ctx = &t2;
1870
1871 WWAI(&t);
1872 t2 = t;
1873 t2.stamp--;
1874
1875 ret = WWL(&o, &t);
1876 WARN_ON(ret);
1877
1878 ret = WWL(&o2, &t);
1879 WARN_ON(ret != -EDEADLK);
1880
1881 ret = WWL(&o3, &t);
1882}
1883
1884static void ww_test_edeadlk_acquire_more_slow(void)
1885{
1886 int ret;
1887
1888 mutex_lock(&o2.base);
5facae4f 1889 mutex_release(&o2.base.dep_map, _THIS_IP_);
f3cf139e
ML		 1890 o2.ctx = &t2;
1891
1892 WWAI(&t);
1893 t2 = t;
1894 t2.stamp--;
1895
1896 ret = WWL(&o, &t);
1897 WARN_ON(ret);
1898
1899 ret = WWL(&o2, &t);
1900 WARN_ON(ret != -EDEADLK);
1901
1902 ww_mutex_lock_slow(&o3, &t);
1903}
1904
1905static void ww_test_edeadlk_acquire_more_edeadlk(void)
1906{
1907 int ret;
1908
1909 mutex_lock(&o2.base);
5facae4f 1910 mutex_release(&o2.base.dep_map, _THIS_IP_);
f3cf139e
ML		 1911 o2.ctx = &t2;
1912
1913 mutex_lock(&o3.base);
5facae4f 1914 mutex_release(&o3.base.dep_map, _THIS_IP_);
f3cf139e
ML		 1915 o3.ctx = &t2;
1916
1917 WWAI(&t);
1918 t2 = t;
1919 t2.stamp--;
1920
1921 ret = WWL(&o, &t);
1922 WARN_ON(ret);
1923
1924 ret = WWL(&o2, &t);
1925 WARN_ON(ret != -EDEADLK);
1926
1927 ret = WWL(&o3, &t);
1928 WARN_ON(ret != -EDEADLK);
1929}
1930
1931static void ww_test_edeadlk_acquire_more_edeadlk_slow(void)
1932{
1933 int ret;
1934
1935 mutex_lock(&o2.base);
5facae4f 1936 mutex_release(&o2.base.dep_map, _THIS_IP_);
f3cf139e
ML		 1937 o2.ctx = &t2;
1938
1939 mutex_lock(&o3.base);
5facae4f 1940 mutex_release(&o3.base.dep_map, _THIS_IP_);
f3cf139e
ML		 1941 o3.ctx = &t2;
1942
1943 WWAI(&t);
1944 t2 = t;
1945 t2.stamp--;
1946
1947 ret = WWL(&o, &t);
1948 WARN_ON(ret);
1949
1950 ret = WWL(&o2, &t);
1951 WARN_ON(ret != -EDEADLK);
1952
1953 ww_mutex_lock_slow(&o3, &t);
1954}
1955
1956static void ww_test_edeadlk_acquire_wrong(void)
1957{
1958 int ret;
1959
1960 mutex_lock(&o2.base);
5facae4f 1961 mutex_release(&o2.base.dep_map, _THIS_IP_);
f3cf139e
ML		 1962 o2.ctx = &t2;
1963
1964 WWAI(&t);
1965 t2 = t;
1966 t2.stamp--;
1967
1968 ret = WWL(&o, &t);
1969 WARN_ON(ret);
1970
1971 ret = WWL(&o2, &t);
1972 WARN_ON(ret != -EDEADLK);
1973 if (!ret)
1974 WWU(&o2);
1975
1976 WWU(&o);
1977
1978 ret = WWL(&o3, &t);
1979}
1980
1981static void ww_test_edeadlk_acquire_wrong_slow(void)
1982{
1983 int ret;
1984
1985 mutex_lock(&o2.base);
5facae4f 1986 mutex_release(&o2.base.dep_map, _THIS_IP_);
f3cf139e
ML		 1987 o2.ctx = &t2;
1988
1989 WWAI(&t);
1990 t2 = t;
1991 t2.stamp--;
1992
1993 ret = WWL(&o, &t);
1994 WARN_ON(ret);
1995
1996 ret = WWL(&o2, &t);
1997 WARN_ON(ret != -EDEADLK);
1998 if (!ret)
1999 WWU(&o2);
2000
2001 WWU(&o);
2002
2003 ww_mutex_lock_slow(&o3, &t);
2004}
2005
1de99445
ML		 2006static void ww_test_spin_nest_unlocked(void)
2007{
2008 raw_spin_lock_nest_lock(&lock_A, &o.base);
2009 U(A);
2010}
2011
2012static void ww_test_unneeded_slow(void)
2013{
2014 WWAI(&t);
2015
2016 ww_mutex_lock_slow(&o, &t);
2017}
2018
2019static void ww_test_context_block(void)
2020{
2021 int ret;
2022
2023 WWAI(&t);
2024
2025 ret = WWL(&o, &t);
2026 WARN_ON(ret);
2027 WWL1(&o2);
2028}
2029
2030static void ww_test_context_try(void)
2031{
2032 int ret;
2033
2034 WWAI(&t);
2035
2036 ret = WWL(&o, &t);
2037 WARN_ON(ret);
2038
2039 ret = WWT(&o2);
2040 WARN_ON(!ret);
2041 WWU(&o2);
2042 WWU(&o);
2043}
2044
2045static void ww_test_context_context(void)
2046{
2047 int ret;
2048
2049 WWAI(&t);
2050
2051 ret = WWL(&o, &t);
2052 WARN_ON(ret);
2053
2054 ret = WWL(&o2, &t);
2055 WARN_ON(ret);
2056
2057 WWU(&o2);
2058 WWU(&o);
2059}
2060
2061static void ww_test_try_block(void)
2062{
2063 bool ret;
2064
2065 ret = WWT(&o);
2066 WARN_ON(!ret);
2067
2068 WWL1(&o2);
2069 WWU(&o2);
2070 WWU(&o);
2071}
2072
2073static void ww_test_try_try(void)
2074{
2075 bool ret;
2076
2077 ret = WWT(&o);
2078 WARN_ON(!ret);
2079 ret = WWT(&o2);
2080 WARN_ON(!ret);
2081 WWU(&o2);
2082 WWU(&o);
2083}
2084
2085static void ww_test_try_context(void)
2086{
2087 int ret;
2088
2089 ret = WWT(&o);
2090 WARN_ON(!ret);
2091
2092 WWAI(&t);
2093
2094 ret = WWL(&o2, &t);
2095 WARN_ON(ret);
2096}
2097
2098static void ww_test_block_block(void)
2099{
2100 WWL1(&o);
2101 WWL1(&o2);
2102}
2103
2104static void ww_test_block_try(void)
2105{
2106 bool ret;
2107
2108 WWL1(&o);
2109 ret = WWT(&o2);
2110 WARN_ON(!ret);
2111}
2112
2113static void ww_test_block_context(void)
2114{
2115 int ret;
2116
2117 WWL1(&o);
2118 WWAI(&t);
2119
2120 ret = WWL(&o2, &t);
2121 WARN_ON(ret);
2122}
2123
2124static void ww_test_spin_block(void)
2125{
2126 L(A);
2127 U(A);
2128
2129 WWL1(&o);
2130 L(A);
2131 U(A);
2132 WWU(&o);
2133
2134 L(A);
2135 WWL1(&o);
2136 WWU(&o);
2137 U(A);
2138}
2139
2140static void ww_test_spin_try(void)
2141{
2142 bool ret;
2143
2144 L(A);
2145 U(A);
2146
2147 ret = WWT(&o);
2148 WARN_ON(!ret);
2149 L(A);
2150 U(A);
2151 WWU(&o);
2152
2153 L(A);
2154 ret = WWT(&o);
2155 WARN_ON(!ret);
2156 WWU(&o);
2157 U(A);
2158}
2159
2160static void ww_test_spin_context(void)
2161{
2162 int ret;
2163
2164 L(A);
2165 U(A);
2166
2167 WWAI(&t);
2168
2169 ret = WWL(&o, &t);
2170 WARN_ON(ret);
2171 L(A);
2172 U(A);
2173 WWU(&o);
2174
2175 L(A);
2176 ret = WWL(&o, &t);
2177 WARN_ON(ret);
2178 WWU(&o);
2179 U(A);
2180}
2181
2182static void ww_tests(void)
2183{
2184 printk(" --------------------------------------------------------------------------\n");
2185 printk(" | Wound/wait tests |\n");
2186 printk(" ---------------------\n");
2187
2188 print_testname("ww api failures");
2189 dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW);
2fe3d4b1 2190 dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW);
1de99445 2191 dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW);
25139409 2192 pr_cont("\n");
1de99445
ML		 2193
2194 print_testname("ww contexts mixing");
2195 dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW);
2196 dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW);
25139409 2197 pr_cont("\n");
1de99445
ML		 2198
2199 print_testname("finishing ww context");
2200 dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW);
2201 dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW);
2202 dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW);
2203 dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW);
25139409 2204 pr_cont("\n");
1de99445
ML		 2205
2206 print_testname("locking mismatches");
2207 dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW);
2208 dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW);
2209 dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW);
25139409 2210 pr_cont("\n");
1de99445 2211
f3cf139e
ML		 2212 print_testname("EDEADLK handling");
2213 dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW);
2214 dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW);
2215 dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW);
2216 dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW);
2217 dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW);
2218 dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW);
2219 dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW);
2220 dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW);
2221 dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW);
2222 dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW);
25139409 2223 pr_cont("\n");
f3cf139e 2224
1de99445
ML		 2225 print_testname("spinlock nest unlocked");
2226 dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW);
25139409 2227 pr_cont("\n");
1de99445
ML		 2228
2229 printk(" -----------------------------------------------------\n");
2230 printk(" |block | try |context|\n");
2231 printk(" -----------------------------------------------------\n");
2232
2233 print_testname("context");
2234 dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW);
2235 dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW);
2236 dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW);
25139409 2237 pr_cont("\n");
1de99445
ML		 2238
2239 print_testname("try");
2240 dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW);
2241 dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW);
2242 dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW);
25139409 2243 pr_cont("\n");
1de99445
ML		 2244
2245 print_testname("block");
2246 dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW);
2247 dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW);
2248 dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW);
25139409 2249 pr_cont("\n");
1de99445
ML		 2250
2251 print_testname("spinlock");
2252 dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW);
2253 dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW);
2254 dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW);
25139409 2255 pr_cont("\n");
1de99445 2256}
cae2ed9a 2257
ad56450d
BF		 2258
2259/*
2260 * <in hardirq handler>
2261 * read_lock(&A);
2262 * <hardirq disable>
2263 * spin_lock(&B);
2264 * spin_lock(&B);
2265 * read_lock(&A);
2266 *
2267 * is a deadlock.
2268 */
2269static void queued_read_lock_hardirq_RE_Er(void)
2270{
2271 HARDIRQ_ENTER();
2272 read_lock(&rwlock_A);
2273 LOCK(B);
2274 UNLOCK(B);
2275 read_unlock(&rwlock_A);
2276 HARDIRQ_EXIT();
2277
2278 HARDIRQ_DISABLE();
2279 LOCK(B);
2280 read_lock(&rwlock_A);
2281 read_unlock(&rwlock_A);
2282 UNLOCK(B);
2283 HARDIRQ_ENABLE();
2284}
2285
2286/*
2287 * <in hardirq handler>
2288 * spin_lock(&B);
2289 * <hardirq disable>
2290 * read_lock(&A);
2291 * read_lock(&A);
2292 * spin_lock(&B);
2293 *
2294 * is not a deadlock.
2295 */
2296static void queued_read_lock_hardirq_ER_rE(void)
2297{
2298 HARDIRQ_ENTER();
2299 LOCK(B);
2300 read_lock(&rwlock_A);
2301 read_unlock(&rwlock_A);
2302 UNLOCK(B);
2303 HARDIRQ_EXIT();
2304
2305 HARDIRQ_DISABLE();
2306 read_lock(&rwlock_A);
2307 LOCK(B);
2308 UNLOCK(B);
2309 read_unlock(&rwlock_A);
2310 HARDIRQ_ENABLE();
2311}
2312
2313/*
2314 * <hardirq disable>
2315 * spin_lock(&B);
2316 * read_lock(&A);
2317 * <in hardirq handler>
2318 * spin_lock(&B);
2319 * read_lock(&A);
2320 *
2321 * is a deadlock. Because the two read_lock()s are both non-recursive readers.
2322 */
2323static void queued_read_lock_hardirq_inversion(void)
2324{
2325
2326 HARDIRQ_ENTER();
2327 LOCK(B);
2328 UNLOCK(B);
2329 HARDIRQ_EXIT();
2330
2331 HARDIRQ_DISABLE();
2332 LOCK(B);
2333 read_lock(&rwlock_A);
2334 read_unlock(&rwlock_A);
2335 UNLOCK(B);
2336 HARDIRQ_ENABLE();
2337
2338 read_lock(&rwlock_A);
2339 read_unlock(&rwlock_A);
2340}
2341
2342static void queued_read_lock_tests(void)
2343{
2344 printk(" --------------------------------------------------------------------------\n");
2345 printk(" | queued read lock tests |\n");
2346 printk(" ---------------------------\n");
2347 print_testname("hardirq read-lock/lock-read");
2348 dotest(queued_read_lock_hardirq_RE_Er, FAILURE, LOCKTYPE_RWLOCK);
2349 pr_cont("\n");
2350
2351 print_testname("hardirq lock-read/read-lock");
2352 dotest(queued_read_lock_hardirq_ER_rE, SUCCESS, LOCKTYPE_RWLOCK);
2353 pr_cont("\n");
2354
2355 print_testname("hardirq inversion");
2356 dotest(queued_read_lock_hardirq_inversion, FAILURE, LOCKTYPE_RWLOCK);
2357 pr_cont("\n");
2358}
2359
cae2ed9a
IM		 2360void locking_selftest(void)
2361{
2362 /*
2363 * Got a locking failure before the selftest ran?
2364 */
2365 if (!debug_locks) {
2366 printk("----------------------------------\n");
2367 printk("| Locking API testsuite disabled |\n");
2368 printk("----------------------------------\n");
2369 return;
2370 }
2371
e9181886
BF		 2372 /*
2373 * treats read_lock() as recursive read locks for testing purpose
2374 */
2375 force_read_lock_recursive = 1;
2376
cae2ed9a
IM		 2377 /*
2378 * Run the testsuite:
2379 */
2380 printk("------------------------\n");
2381 printk("| Locking API testsuite:\n");
2382 printk("----------------------------------------------------------------------------\n");
2383 printk(" | spin |wlock |rlock |mutex | wsem | rsem |\n");
2384 printk(" --------------------------------------------------------------------------\n");
2385
2386 init_shared_classes();
2387 debug_locks_silent = !debug_locks_verbose;
cdc84d79 2388 lockdep_set_selftest_task(current);
cae2ed9a 2389
6c9076ec 2390 DO_TESTCASE_6R("A-A deadlock", AA);
cae2ed9a
IM		 2391 DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
2392 DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA);
2393 DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC);
2394 DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA);
2395 DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA);
2396 DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA);
2397 DO_TESTCASE_6("double unlock", double_unlock);
2398 DO_TESTCASE_6("initialize held", init_held);
cae2ed9a
IM		 2399
2400 printk(" --------------------------------------------------------------------------\n");
2401 print_testname("recursive read-lock");
25139409 2402 pr_cont(" |");
cae2ed9a 2403 dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
25139409 2404 pr_cont(" |");
cae2ed9a 2405 dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
25139409 2406 pr_cont("\n");
cae2ed9a
IM		 2407
2408 print_testname("recursive read-lock #2");
25139409 2409 pr_cont(" |");
6c9076ec 2410 dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK);
25139409 2411 pr_cont(" |");
cae2ed9a 2412 dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
25139409 2413 pr_cont("\n");
cae2ed9a
IM		 2414
2415 print_testname("mixed read-write-lock");
25139409 2416 pr_cont(" |");
cae2ed9a 2417 dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK);
25139409 2418 pr_cont(" |");
cae2ed9a 2419 dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM);
25139409 2420 pr_cont("\n");
cae2ed9a
IM		 2421
2422 print_testname("mixed write-read-lock");
25139409 2423 pr_cont(" |");
cae2ed9a 2424 dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK);
25139409 2425 pr_cont(" |");
cae2ed9a 2426 dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
25139409 2427 pr_cont("\n");
cae2ed9a 2428
e9149858
PZ		 2429 print_testname("mixed read-lock/lock-write ABBA");
2430 pr_cont(" |");
2431 dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
2432 pr_cont(" |");
2433 dotest(rwsem_ABBA1, FAILURE, LOCKTYPE_RWSEM);
2434
2435 print_testname("mixed read-lock/lock-read ABBA");
2436 pr_cont(" |");
2437 dotest(rlock_ABBA2, SUCCESS, LOCKTYPE_RWLOCK);
2438 pr_cont(" |");
2439 dotest(rwsem_ABBA2, FAILURE, LOCKTYPE_RWSEM);
2440
2441 print_testname("mixed write-lock/lock-write ABBA");
2442 pr_cont(" |");
2443 dotest(rlock_ABBA3, FAILURE, LOCKTYPE_RWLOCK);
2444 pr_cont(" |");
2445 dotest(rwsem_ABBA3, FAILURE, LOCKTYPE_RWSEM);
2446
d4f200e5
BF		 2447 print_testname("chain cached mixed R-L/L-W ABBA");
2448 pr_cont(" |");
2449 dotest(rlock_chaincache_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
2450
8ef7ca75
BF		 2451 DO_TESTCASE_6x1RRB("rlock W1R2/W2R3/W3R1", W1R2_W2R3_W3R1);
2452 DO_TESTCASE_6x1RRB("rlock W1W2/R2R3/W3R1", W1W2_R2R3_W3R1);
2453 DO_TESTCASE_6x1RR("rlock W1W2/R2R3/R3W1", W1W2_R2R3_R3W1);
2454 DO_TESTCASE_6x1RR("rlock W1R2/R2R3/W3W1", W1R2_R2R3_W3W1);
2455
cae2ed9a
IM		 2456 printk(" --------------------------------------------------------------------------\n");
2457
2458 /*
2459 * irq-context testcases:
2460 */
2461 DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1);
2462 DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A);
2463 DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B);
2464 DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3);
2465 DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4);
2466 DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion);
2467
31e0d747
BF		 2468 DO_TESTCASE_6x2x2RW("irq read-recursion", irq_read_recursion);
2469 DO_TESTCASE_6x2x2RW("irq read-recursion #2", irq_read_recursion2);
96a16f45 2470 DO_TESTCASE_6x2x2RW("irq read-recursion #3", irq_read_recursion3);
cae2ed9a 2471
1de99445
ML		 2472 ww_tests();
2473
e9181886
BF		 2474 force_read_lock_recursive = 0;
2475 /*
2476 * queued_read_lock() specific test cases can be put here
2477 */
ad56450d
BF		 2478 if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS))
2479 queued_read_lock_tests();
e9181886 2480
cae2ed9a
IM		 2481 if (unexpected_testcase_failures) {
2482 printk("-----------------------------------------------------------------\n");
2483 debug_locks = 0;
2484 printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
2485 unexpected_testcase_failures, testcase_total);
2486 printk("-----------------------------------------------------------------\n");
2487 } else if (expected_testcase_failures && testcase_successes) {
2488 printk("--------------------------------------------------------\n");
2489 printk("%3d out of %3d testcases failed, as expected. |\n",
2490 expected_testcase_failures, testcase_total);
2491 printk("----------------------------------------------------\n");
2492 debug_locks = 1;
2493 } else if (expected_testcase_failures && !testcase_successes) {
2494 printk("--------------------------------------------------------\n");
2495 printk("All %3d testcases failed, as expected. |\n",
2496 expected_testcase_failures);
2497 printk("----------------------------------------\n");
2498 debug_locks = 1;
2499 } else {
2500 printk("-------------------------------------------------------\n");
2501 printk("Good, all %3d testcases passed! |\n",
2502 testcase_successes);
2503 printk("---------------------------------\n");
2504 debug_locks = 1;
2505 }
cdc84d79 2506 lockdep_set_selftest_task(NULL);
cae2ed9a
IM		 2507 debug_locks_silent = 0;
2508}
Linux 6.x block layer and io_uring tree(s)