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v5.14.15
   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 <mingo@redhat.com>
  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/*
  30 * Change this to 1 if you want to see the failure printouts:
  31 */
  32static unsigned int debug_locks_verbose;
  33unsigned int force_read_lock_recursive;
  34
  35static DEFINE_WD_CLASS(ww_lockdep);
  36
  37static int __init setup_debug_locks_verbose(char *str)
  38{
  39	get_option(&str, &debug_locks_verbose);
  40
  41	return 1;
  42}
  43
  44__setup("debug_locks_verbose=", setup_debug_locks_verbose);
  45
  46#define FAILURE		0
  47#define SUCCESS		1
  48
  49#define LOCKTYPE_SPIN	0x1
  50#define LOCKTYPE_RWLOCK	0x2
  51#define LOCKTYPE_MUTEX	0x4
  52#define LOCKTYPE_RWSEM	0x8
  53#define LOCKTYPE_WW	0x10
  54#define LOCKTYPE_RTMUTEX 0x20
  55#define LOCKTYPE_LL	0x40
  56#define LOCKTYPE_SPECIAL 0x80
  57
  58static struct ww_acquire_ctx t, t2;
  59static struct ww_mutex o, o2, o3;
  60
  61/*
  62 * Normal standalone locks, for the circular and irq-context
  63 * dependency tests:
  64 */
  65static DEFINE_SPINLOCK(lock_A);
  66static DEFINE_SPINLOCK(lock_B);
  67static DEFINE_SPINLOCK(lock_C);
  68static DEFINE_SPINLOCK(lock_D);
  69
  70static DEFINE_RAW_SPINLOCK(raw_lock_A);
  71static DEFINE_RAW_SPINLOCK(raw_lock_B);
  72
  73static DEFINE_RWLOCK(rwlock_A);
  74static DEFINE_RWLOCK(rwlock_B);
  75static DEFINE_RWLOCK(rwlock_C);
  76static DEFINE_RWLOCK(rwlock_D);
  77
  78static DEFINE_MUTEX(mutex_A);
  79static DEFINE_MUTEX(mutex_B);
  80static DEFINE_MUTEX(mutex_C);
  81static DEFINE_MUTEX(mutex_D);
  82
  83static DECLARE_RWSEM(rwsem_A);
  84static DECLARE_RWSEM(rwsem_B);
  85static DECLARE_RWSEM(rwsem_C);
  86static DECLARE_RWSEM(rwsem_D);
  87
  88#ifdef CONFIG_RT_MUTEXES
  89
  90static DEFINE_RT_MUTEX(rtmutex_A);
  91static DEFINE_RT_MUTEX(rtmutex_B);
  92static DEFINE_RT_MUTEX(rtmutex_C);
  93static DEFINE_RT_MUTEX(rtmutex_D);
  94
  95#endif
  96
  97/*
  98 * Locks that we initialize dynamically as well so that
  99 * e.g. X1 and X2 becomes two instances of the same class,
 100 * but X* and Y* are different classes. We do this so that
 101 * we do not trigger a real lockup:
 102 */
 103static DEFINE_SPINLOCK(lock_X1);
 104static DEFINE_SPINLOCK(lock_X2);
 105static DEFINE_SPINLOCK(lock_Y1);
 106static DEFINE_SPINLOCK(lock_Y2);
 107static DEFINE_SPINLOCK(lock_Z1);
 108static DEFINE_SPINLOCK(lock_Z2);
 109
 110static DEFINE_RWLOCK(rwlock_X1);
 111static DEFINE_RWLOCK(rwlock_X2);
 112static DEFINE_RWLOCK(rwlock_Y1);
 113static DEFINE_RWLOCK(rwlock_Y2);
 114static DEFINE_RWLOCK(rwlock_Z1);
 115static DEFINE_RWLOCK(rwlock_Z2);
 116
 117static DEFINE_MUTEX(mutex_X1);
 118static DEFINE_MUTEX(mutex_X2);
 119static DEFINE_MUTEX(mutex_Y1);
 120static DEFINE_MUTEX(mutex_Y2);
 121static DEFINE_MUTEX(mutex_Z1);
 122static DEFINE_MUTEX(mutex_Z2);
 123
 124static DECLARE_RWSEM(rwsem_X1);
 125static DECLARE_RWSEM(rwsem_X2);
 126static DECLARE_RWSEM(rwsem_Y1);
 127static DECLARE_RWSEM(rwsem_Y2);
 128static DECLARE_RWSEM(rwsem_Z1);
 129static DECLARE_RWSEM(rwsem_Z2);
 130
 131#ifdef CONFIG_RT_MUTEXES
 132
 133static DEFINE_RT_MUTEX(rtmutex_X1);
 134static DEFINE_RT_MUTEX(rtmutex_X2);
 135static DEFINE_RT_MUTEX(rtmutex_Y1);
 136static DEFINE_RT_MUTEX(rtmutex_Y2);
 137static DEFINE_RT_MUTEX(rtmutex_Z1);
 138static DEFINE_RT_MUTEX(rtmutex_Z2);
 139
 140#endif
 141
 142static local_lock_t local_A = INIT_LOCAL_LOCK(local_A);
 143
 144/*
 145 * non-inlined runtime initializers, to let separate locks share
 146 * the same lock-class:
 147 */
 148#define INIT_CLASS_FUNC(class) 				\
 149static noinline void					\
 150init_class_##class(spinlock_t *lock, rwlock_t *rwlock, \
 151	struct mutex *mutex, struct rw_semaphore *rwsem)\
 152{							\
 153	spin_lock_init(lock);			\
 154	rwlock_init(rwlock);				\
 155	mutex_init(mutex);				\
 156	init_rwsem(rwsem);				\
 157}
 158
 159INIT_CLASS_FUNC(X)
 160INIT_CLASS_FUNC(Y)
 161INIT_CLASS_FUNC(Z)
 162
 163static void init_shared_classes(void)
 164{
 165#ifdef CONFIG_RT_MUTEXES
 166	static struct lock_class_key rt_X, rt_Y, rt_Z;
 167
 168	__rt_mutex_init(&rtmutex_X1, __func__, &rt_X);
 169	__rt_mutex_init(&rtmutex_X2, __func__, &rt_X);
 170	__rt_mutex_init(&rtmutex_Y1, __func__, &rt_Y);
 171	__rt_mutex_init(&rtmutex_Y2, __func__, &rt_Y);
 172	__rt_mutex_init(&rtmutex_Z1, __func__, &rt_Z);
 173	__rt_mutex_init(&rtmutex_Z2, __func__, &rt_Z);
 174#endif
 175
 176	init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1);
 177	init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2);
 178
 179	init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1);
 180	init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2);
 181
 182	init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1);
 183	init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2);
 184}
 185
 186/*
 187 * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests.
 188 * The following functions use a lock from a simulated hardirq/softirq
 189 * context, causing the locks to be marked as hardirq-safe/softirq-safe:
 190 */
 191
 192#define HARDIRQ_DISABLE		local_irq_disable
 193#define HARDIRQ_ENABLE		local_irq_enable
 194
 195#define HARDIRQ_ENTER()				\
 196	local_irq_disable();			\
 197	__irq_enter();				\
 198	lockdep_hardirq_threaded();		\
 199	WARN_ON(!in_irq());
 200
 201#define HARDIRQ_EXIT()				\
 202	__irq_exit();				\
 203	local_irq_enable();
 204
 205#define SOFTIRQ_DISABLE		local_bh_disable
 206#define SOFTIRQ_ENABLE		local_bh_enable
 207
 208#define SOFTIRQ_ENTER()				\
 209		local_bh_disable();		\
 210		local_irq_disable();		\
 211		lockdep_softirq_enter();	\
 212		WARN_ON(!in_softirq());
 213
 214#define SOFTIRQ_EXIT()				\
 215		lockdep_softirq_exit();		\
 216		local_irq_enable();		\
 217		local_bh_enable();
 218
 219/*
 220 * Shortcuts for lock/unlock API variants, to keep
 221 * the testcases compact:
 222 */
 223#define L(x)			spin_lock(&lock_##x)
 224#define U(x)			spin_unlock(&lock_##x)
 225#define LU(x)			L(x); U(x)
 226#define SI(x)			spin_lock_init(&lock_##x)
 227
 228#define WL(x)			write_lock(&rwlock_##x)
 229#define WU(x)			write_unlock(&rwlock_##x)
 230#define WLU(x)			WL(x); WU(x)
 231
 232#define RL(x)			read_lock(&rwlock_##x)
 233#define RU(x)			read_unlock(&rwlock_##x)
 234#define RLU(x)			RL(x); RU(x)
 235#define RWI(x)			rwlock_init(&rwlock_##x)
 236
 237#define ML(x)			mutex_lock(&mutex_##x)
 238#define MU(x)			mutex_unlock(&mutex_##x)
 239#define MI(x)			mutex_init(&mutex_##x)
 240
 241#define RTL(x)			rt_mutex_lock(&rtmutex_##x)
 242#define RTU(x)			rt_mutex_unlock(&rtmutex_##x)
 243#define RTI(x)			rt_mutex_init(&rtmutex_##x)
 244
 245#define WSL(x)			down_write(&rwsem_##x)
 246#define WSU(x)			up_write(&rwsem_##x)
 247
 248#define RSL(x)			down_read(&rwsem_##x)
 249#define RSU(x)			up_read(&rwsem_##x)
 250#define RWSI(x)			init_rwsem(&rwsem_##x)
 251
 252#ifndef CONFIG_DEBUG_WW_MUTEX_SLOWPATH
 253#define WWAI(x)			ww_acquire_init(x, &ww_lockdep)
 254#else
 255#define WWAI(x)			do { ww_acquire_init(x, &ww_lockdep); (x)->deadlock_inject_countdown = ~0U; } while (0)
 256#endif
 257#define WWAD(x)			ww_acquire_done(x)
 258#define WWAF(x)			ww_acquire_fini(x)
 259
 260#define WWL(x, c)		ww_mutex_lock(x, c)
 261#define WWT(x)			ww_mutex_trylock(x)
 262#define WWL1(x)			ww_mutex_lock(x, NULL)
 263#define WWU(x)			ww_mutex_unlock(x)
 264
 265
 266#define LOCK_UNLOCK_2(x,y)	LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x)
 267
 268/*
 269 * Generate different permutations of the same testcase, using
 270 * the same basic lock-dependency/state events:
 271 */
 272
 273#define GENERATE_TESTCASE(name)			\
 274						\
 275static void name(void) { E(); }
 276
 277#define GENERATE_PERMUTATIONS_2_EVENTS(name)	\
 278						\
 279static void name##_12(void) { E1(); E2(); }	\
 280static void name##_21(void) { E2(); E1(); }
 281
 282#define GENERATE_PERMUTATIONS_3_EVENTS(name)		\
 283							\
 284static void name##_123(void) { E1(); E2(); E3(); }	\
 285static void name##_132(void) { E1(); E3(); E2(); }	\
 286static void name##_213(void) { E2(); E1(); E3(); }	\
 287static void name##_231(void) { E2(); E3(); E1(); }	\
 288static void name##_312(void) { E3(); E1(); E2(); }	\
 289static void name##_321(void) { E3(); E2(); E1(); }
 290
 291/*
 292 * AA deadlock:
 293 */
 294
 295#define E()					\
 296						\
 297	LOCK(X1);				\
 298	LOCK(X2); /* this one should fail */
 299
 300/*
 301 * 6 testcases:
 302 */
 303#include "locking-selftest-spin.h"
 304GENERATE_TESTCASE(AA_spin)
 305#include "locking-selftest-wlock.h"
 306GENERATE_TESTCASE(AA_wlock)
 307#include "locking-selftest-rlock.h"
 308GENERATE_TESTCASE(AA_rlock)
 309#include "locking-selftest-mutex.h"
 310GENERATE_TESTCASE(AA_mutex)
 311#include "locking-selftest-wsem.h"
 312GENERATE_TESTCASE(AA_wsem)
 313#include "locking-selftest-rsem.h"
 314GENERATE_TESTCASE(AA_rsem)
 315
 316#ifdef CONFIG_RT_MUTEXES
 317#include "locking-selftest-rtmutex.h"
 318GENERATE_TESTCASE(AA_rtmutex);
 319#endif
 320
 321#undef E
 322
 323/*
 324 * Special-case for read-locking, they are
 325 * allowed to recurse on the same lock class:
 326 */
 327static void rlock_AA1(void)
 328{
 329	RL(X1);
 330	RL(X1); // this one should NOT fail
 331}
 332
 333static void rlock_AA1B(void)
 334{
 335	RL(X1);
 336	RL(X2); // this one should NOT fail
 337}
 338
 339static void rsem_AA1(void)
 340{
 341	RSL(X1);
 342	RSL(X1); // this one should fail
 343}
 344
 345static void rsem_AA1B(void)
 346{
 347	RSL(X1);
 348	RSL(X2); // this one should fail
 349}
 350/*
 351 * The mixing of read and write locks is not allowed:
 352 */
 353static void rlock_AA2(void)
 354{
 355	RL(X1);
 356	WL(X2); // this one should fail
 357}
 358
 359static void rsem_AA2(void)
 360{
 361	RSL(X1);
 362	WSL(X2); // this one should fail
 363}
 364
 365static void rlock_AA3(void)
 366{
 367	WL(X1);
 368	RL(X2); // this one should fail
 369}
 370
 371static void rsem_AA3(void)
 372{
 373	WSL(X1);
 374	RSL(X2); // this one should fail
 375}
 376
 377/*
 378 * read_lock(A)
 379 * spin_lock(B)
 380 *		spin_lock(B)
 381 *		write_lock(A)
 382 */
 383static void rlock_ABBA1(void)
 384{
 385	RL(X1);
 386	L(Y1);
 387	U(Y1);
 388	RU(X1);
 389
 390	L(Y1);
 391	WL(X1);
 392	WU(X1);
 393	U(Y1); // should fail
 394}
 395
 396static void rwsem_ABBA1(void)
 397{
 398	RSL(X1);
 399	ML(Y1);
 400	MU(Y1);
 401	RSU(X1);
 402
 403	ML(Y1);
 404	WSL(X1);
 405	WSU(X1);
 406	MU(Y1); // should fail
 407}
 408
 409/*
 410 * read_lock(A)
 411 * spin_lock(B)
 412 *		spin_lock(B)
 413 *		write_lock(A)
 414 *
 415 * This test case is aimed at poking whether the chain cache prevents us from
 416 * detecting a read-lock/lock-write deadlock: if the chain cache doesn't differ
 417 * read/write locks, the following case may happen
 418 *
 419 * 	{ read_lock(A)->lock(B) dependency exists }
 420 *
 421 * 	P0:
 422 * 	lock(B);
 423 * 	read_lock(A);
 424 *
 425 *	{ Not a deadlock, B -> A is added in the chain cache }
 426 *
 427 *	P1:
 428 *	lock(B);
 429 *	write_lock(A);
 430 *
 431 *	{ B->A found in chain cache, not reported as a deadlock }
 432 *
 433 */
 434static void rlock_chaincache_ABBA1(void)
 435{
 436	RL(X1);
 437	L(Y1);
 438	U(Y1);
 439	RU(X1);
 440
 441	L(Y1);
 442	RL(X1);
 443	RU(X1);
 444	U(Y1);
 445
 446	L(Y1);
 447	WL(X1);
 448	WU(X1);
 449	U(Y1); // should fail
 450}
 451
 452/*
 453 * read_lock(A)
 454 * spin_lock(B)
 455 *		spin_lock(B)
 456 *		read_lock(A)
 457 */
 458static void rlock_ABBA2(void)
 459{
 460	RL(X1);
 461	L(Y1);
 462	U(Y1);
 463	RU(X1);
 464
 465	L(Y1);
 466	RL(X1);
 467	RU(X1);
 468	U(Y1); // should NOT fail
 469}
 470
 471static void rwsem_ABBA2(void)
 472{
 473	RSL(X1);
 474	ML(Y1);
 475	MU(Y1);
 476	RSU(X1);
 477
 478	ML(Y1);
 479	RSL(X1);
 480	RSU(X1);
 481	MU(Y1); // should fail
 482}
 483
 484
 485/*
 486 * write_lock(A)
 487 * spin_lock(B)
 488 *		spin_lock(B)
 489 *		write_lock(A)
 490 */
 491static void rlock_ABBA3(void)
 492{
 493	WL(X1);
 494	L(Y1);
 495	U(Y1);
 496	WU(X1);
 497
 498	L(Y1);
 499	WL(X1);
 500	WU(X1);
 501	U(Y1); // should fail
 502}
 503
 504static void rwsem_ABBA3(void)
 505{
 506	WSL(X1);
 507	ML(Y1);
 508	MU(Y1);
 509	WSU(X1);
 510
 511	ML(Y1);
 512	WSL(X1);
 513	WSU(X1);
 514	MU(Y1); // should fail
 515}
 516
 517/*
 518 * ABBA deadlock:
 519 */
 520
 521#define E()					\
 522						\
 523	LOCK_UNLOCK_2(A, B);			\
 524	LOCK_UNLOCK_2(B, A); /* fail */
 525
 526/*
 527 * 6 testcases:
 528 */
 529#include "locking-selftest-spin.h"
 530GENERATE_TESTCASE(ABBA_spin)
 531#include "locking-selftest-wlock.h"
 532GENERATE_TESTCASE(ABBA_wlock)
 533#include "locking-selftest-rlock.h"
 534GENERATE_TESTCASE(ABBA_rlock)
 535#include "locking-selftest-mutex.h"
 536GENERATE_TESTCASE(ABBA_mutex)
 537#include "locking-selftest-wsem.h"
 538GENERATE_TESTCASE(ABBA_wsem)
 539#include "locking-selftest-rsem.h"
 540GENERATE_TESTCASE(ABBA_rsem)
 541
 542#ifdef CONFIG_RT_MUTEXES
 543#include "locking-selftest-rtmutex.h"
 544GENERATE_TESTCASE(ABBA_rtmutex);
 545#endif
 546
 547#undef E
 548
 549/*
 550 * AB BC CA deadlock:
 551 */
 552
 553#define E()					\
 554						\
 555	LOCK_UNLOCK_2(A, B);			\
 556	LOCK_UNLOCK_2(B, C);			\
 557	LOCK_UNLOCK_2(C, A); /* fail */
 558
 559/*
 560 * 6 testcases:
 561 */
 562#include "locking-selftest-spin.h"
 563GENERATE_TESTCASE(ABBCCA_spin)
 564#include "locking-selftest-wlock.h"
 565GENERATE_TESTCASE(ABBCCA_wlock)
 566#include "locking-selftest-rlock.h"
 567GENERATE_TESTCASE(ABBCCA_rlock)
 568#include "locking-selftest-mutex.h"
 569GENERATE_TESTCASE(ABBCCA_mutex)
 570#include "locking-selftest-wsem.h"
 571GENERATE_TESTCASE(ABBCCA_wsem)
 572#include "locking-selftest-rsem.h"
 573GENERATE_TESTCASE(ABBCCA_rsem)
 574
 575#ifdef CONFIG_RT_MUTEXES
 576#include "locking-selftest-rtmutex.h"
 577GENERATE_TESTCASE(ABBCCA_rtmutex);
 578#endif
 579
 580#undef E
 581
 582/*
 583 * AB CA BC deadlock:
 584 */
 585
 586#define E()					\
 587						\
 588	LOCK_UNLOCK_2(A, B);			\
 589	LOCK_UNLOCK_2(C, A);			\
 590	LOCK_UNLOCK_2(B, C); /* fail */
 591
 592/*
 593 * 6 testcases:
 594 */
 595#include "locking-selftest-spin.h"
 596GENERATE_TESTCASE(ABCABC_spin)
 597#include "locking-selftest-wlock.h"
 598GENERATE_TESTCASE(ABCABC_wlock)
 599#include "locking-selftest-rlock.h"
 600GENERATE_TESTCASE(ABCABC_rlock)
 601#include "locking-selftest-mutex.h"
 602GENERATE_TESTCASE(ABCABC_mutex)
 603#include "locking-selftest-wsem.h"
 604GENERATE_TESTCASE(ABCABC_wsem)
 605#include "locking-selftest-rsem.h"
 606GENERATE_TESTCASE(ABCABC_rsem)
 607
 608#ifdef CONFIG_RT_MUTEXES
 609#include "locking-selftest-rtmutex.h"
 610GENERATE_TESTCASE(ABCABC_rtmutex);
 611#endif
 612
 613#undef E
 614
 615/*
 616 * AB BC CD DA deadlock:
 617 */
 618
 619#define E()					\
 620						\
 621	LOCK_UNLOCK_2(A, B);			\
 622	LOCK_UNLOCK_2(B, C);			\
 623	LOCK_UNLOCK_2(C, D);			\
 624	LOCK_UNLOCK_2(D, A); /* fail */
 625
 626/*
 627 * 6 testcases:
 628 */
 629#include "locking-selftest-spin.h"
 630GENERATE_TESTCASE(ABBCCDDA_spin)
 631#include "locking-selftest-wlock.h"
 632GENERATE_TESTCASE(ABBCCDDA_wlock)
 633#include "locking-selftest-rlock.h"
 634GENERATE_TESTCASE(ABBCCDDA_rlock)
 635#include "locking-selftest-mutex.h"
 636GENERATE_TESTCASE(ABBCCDDA_mutex)
 637#include "locking-selftest-wsem.h"
 638GENERATE_TESTCASE(ABBCCDDA_wsem)
 639#include "locking-selftest-rsem.h"
 640GENERATE_TESTCASE(ABBCCDDA_rsem)
 641
 642#ifdef CONFIG_RT_MUTEXES
 643#include "locking-selftest-rtmutex.h"
 644GENERATE_TESTCASE(ABBCCDDA_rtmutex);
 645#endif
 646
 647#undef E
 648
 649/*
 650 * AB CD BD DA deadlock:
 651 */
 652#define E()					\
 653						\
 654	LOCK_UNLOCK_2(A, B);			\
 655	LOCK_UNLOCK_2(C, D);			\
 656	LOCK_UNLOCK_2(B, D);			\
 657	LOCK_UNLOCK_2(D, A); /* fail */
 658
 659/*
 660 * 6 testcases:
 661 */
 662#include "locking-selftest-spin.h"
 663GENERATE_TESTCASE(ABCDBDDA_spin)
 664#include "locking-selftest-wlock.h"
 665GENERATE_TESTCASE(ABCDBDDA_wlock)
 666#include "locking-selftest-rlock.h"
 667GENERATE_TESTCASE(ABCDBDDA_rlock)
 668#include "locking-selftest-mutex.h"
 669GENERATE_TESTCASE(ABCDBDDA_mutex)
 670#include "locking-selftest-wsem.h"
 671GENERATE_TESTCASE(ABCDBDDA_wsem)
 672#include "locking-selftest-rsem.h"
 673GENERATE_TESTCASE(ABCDBDDA_rsem)
 674
 675#ifdef CONFIG_RT_MUTEXES
 676#include "locking-selftest-rtmutex.h"
 677GENERATE_TESTCASE(ABCDBDDA_rtmutex);
 678#endif
 679
 680#undef E
 681
 682/*
 683 * AB CD BC DA deadlock:
 684 */
 685#define E()					\
 686						\
 687	LOCK_UNLOCK_2(A, B);			\
 688	LOCK_UNLOCK_2(C, D);			\
 689	LOCK_UNLOCK_2(B, C);			\
 690	LOCK_UNLOCK_2(D, A); /* fail */
 691
 692/*
 693 * 6 testcases:
 694 */
 695#include "locking-selftest-spin.h"
 696GENERATE_TESTCASE(ABCDBCDA_spin)
 697#include "locking-selftest-wlock.h"
 698GENERATE_TESTCASE(ABCDBCDA_wlock)
 699#include "locking-selftest-rlock.h"
 700GENERATE_TESTCASE(ABCDBCDA_rlock)
 701#include "locking-selftest-mutex.h"
 702GENERATE_TESTCASE(ABCDBCDA_mutex)
 703#include "locking-selftest-wsem.h"
 704GENERATE_TESTCASE(ABCDBCDA_wsem)
 705#include "locking-selftest-rsem.h"
 706GENERATE_TESTCASE(ABCDBCDA_rsem)
 707
 708#ifdef CONFIG_RT_MUTEXES
 709#include "locking-selftest-rtmutex.h"
 710GENERATE_TESTCASE(ABCDBCDA_rtmutex);
 711#endif
 712
 713#undef E
 714
 
 
 
 
 
 715/*
 716 * Double unlock:
 717 */
 718#define E()					\
 719						\
 720	LOCK(A);				\
 
 721	UNLOCK(A);				\
 722	UNLOCK(A); /* fail */
 723
 724/*
 725 * 6 testcases:
 726 */
 727#include "locking-selftest-spin.h"
 728GENERATE_TESTCASE(double_unlock_spin)
 729#include "locking-selftest-wlock.h"
 730GENERATE_TESTCASE(double_unlock_wlock)
 731#include "locking-selftest-rlock.h"
 732GENERATE_TESTCASE(double_unlock_rlock)
 733#include "locking-selftest-mutex.h"
 734GENERATE_TESTCASE(double_unlock_mutex)
 735#include "locking-selftest-wsem.h"
 736GENERATE_TESTCASE(double_unlock_wsem)
 737#include "locking-selftest-rsem.h"
 738GENERATE_TESTCASE(double_unlock_rsem)
 739
 740#ifdef CONFIG_RT_MUTEXES
 741#include "locking-selftest-rtmutex.h"
 742GENERATE_TESTCASE(double_unlock_rtmutex);
 743#endif
 744
 745#undef E
 746
 747/*
 748 * initializing a held lock:
 749 */
 750#define E()					\
 751						\
 752	LOCK(A);				\
 753	INIT(A); /* fail */
 754
 755/*
 756 * 6 testcases:
 757 */
 758#include "locking-selftest-spin.h"
 759GENERATE_TESTCASE(init_held_spin)
 760#include "locking-selftest-wlock.h"
 761GENERATE_TESTCASE(init_held_wlock)
 762#include "locking-selftest-rlock.h"
 763GENERATE_TESTCASE(init_held_rlock)
 764#include "locking-selftest-mutex.h"
 765GENERATE_TESTCASE(init_held_mutex)
 766#include "locking-selftest-wsem.h"
 767GENERATE_TESTCASE(init_held_wsem)
 768#include "locking-selftest-rsem.h"
 769GENERATE_TESTCASE(init_held_rsem)
 770
 771#ifdef CONFIG_RT_MUTEXES
 772#include "locking-selftest-rtmutex.h"
 773GENERATE_TESTCASE(init_held_rtmutex);
 774#endif
 775
 776#undef E
 777
 778/*
 779 * locking an irq-safe lock with irqs enabled:
 780 */
 781#define E1()				\
 782					\
 783	IRQ_ENTER();			\
 784	LOCK(A);			\
 785	UNLOCK(A);			\
 786	IRQ_EXIT();
 787
 788#define E2()				\
 789					\
 790	LOCK(A);			\
 791	UNLOCK(A);
 792
 793/*
 794 * Generate 24 testcases:
 795 */
 796#include "locking-selftest-spin-hardirq.h"
 797GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin)
 798
 799#include "locking-selftest-rlock-hardirq.h"
 800GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock)
 801
 802#include "locking-selftest-wlock-hardirq.h"
 803GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock)
 804
 
 805#include "locking-selftest-spin-softirq.h"
 806GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin)
 807
 808#include "locking-selftest-rlock-softirq.h"
 809GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock)
 810
 811#include "locking-selftest-wlock-softirq.h"
 812GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock)
 
 813
 814#undef E1
 815#undef E2
 816
 
 817/*
 818 * Enabling hardirqs with a softirq-safe lock held:
 819 */
 820#define E1()				\
 821					\
 822	SOFTIRQ_ENTER();		\
 823	LOCK(A);			\
 824	UNLOCK(A);			\
 825	SOFTIRQ_EXIT();
 826
 827#define E2()				\
 828					\
 829	HARDIRQ_DISABLE();		\
 830	LOCK(A);			\
 831	HARDIRQ_ENABLE();		\
 832	UNLOCK(A);
 833
 834/*
 835 * Generate 12 testcases:
 836 */
 837#include "locking-selftest-spin.h"
 838GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin)
 839
 840#include "locking-selftest-wlock.h"
 841GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock)
 842
 843#include "locking-selftest-rlock.h"
 844GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock)
 845
 846#undef E1
 847#undef E2
 848
 
 
 849/*
 850 * Enabling irqs with an irq-safe lock held:
 851 */
 852#define E1()				\
 853					\
 854	IRQ_ENTER();			\
 855	LOCK(A);			\
 856	UNLOCK(A);			\
 857	IRQ_EXIT();
 858
 859#define E2()				\
 860					\
 861	IRQ_DISABLE();			\
 862	LOCK(A);			\
 863	IRQ_ENABLE();			\
 864	UNLOCK(A);
 865
 866/*
 867 * Generate 24 testcases:
 868 */
 869#include "locking-selftest-spin-hardirq.h"
 870GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin)
 871
 872#include "locking-selftest-rlock-hardirq.h"
 873GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock)
 874
 875#include "locking-selftest-wlock-hardirq.h"
 876GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock)
 877
 
 878#include "locking-selftest-spin-softirq.h"
 879GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin)
 880
 881#include "locking-selftest-rlock-softirq.h"
 882GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock)
 883
 884#include "locking-selftest-wlock-softirq.h"
 885GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)
 
 886
 887#undef E1
 888#undef E2
 889
 890/*
 891 * Acquiring a irq-unsafe lock while holding an irq-safe-lock:
 892 */
 893#define E1()				\
 894					\
 895	LOCK(A);			\
 896	LOCK(B);			\
 897	UNLOCK(B);			\
 898	UNLOCK(A);			\
 899
 900#define E2()				\
 901					\
 902	LOCK(B);			\
 903	UNLOCK(B);
 904
 905#define E3()				\
 906					\
 907	IRQ_ENTER();			\
 908	LOCK(A);			\
 909	UNLOCK(A);			\
 910	IRQ_EXIT();
 911
 912/*
 913 * Generate 36 testcases:
 914 */
 915#include "locking-selftest-spin-hardirq.h"
 916GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin)
 917
 918#include "locking-selftest-rlock-hardirq.h"
 919GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock)
 920
 921#include "locking-selftest-wlock-hardirq.h"
 922GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock)
 923
 
 924#include "locking-selftest-spin-softirq.h"
 925GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin)
 926
 927#include "locking-selftest-rlock-softirq.h"
 928GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock)
 929
 930#include "locking-selftest-wlock-softirq.h"
 931GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)
 
 932
 933#undef E1
 934#undef E2
 935#undef E3
 936
 937/*
 938 * If a lock turns into softirq-safe, but earlier it took
 939 * a softirq-unsafe lock:
 940 */
 941
 942#define E1()				\
 943	IRQ_DISABLE();			\
 944	LOCK(A);			\
 945	LOCK(B);			\
 946	UNLOCK(B);			\
 947	UNLOCK(A);			\
 948	IRQ_ENABLE();
 949
 950#define E2()				\
 951	LOCK(B);			\
 952	UNLOCK(B);
 953
 954#define E3()				\
 955	IRQ_ENTER();			\
 956	LOCK(A);			\
 957	UNLOCK(A);			\
 958	IRQ_EXIT();
 959
 960/*
 961 * Generate 36 testcases:
 962 */
 963#include "locking-selftest-spin-hardirq.h"
 964GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin)
 965
 966#include "locking-selftest-rlock-hardirq.h"
 967GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock)
 968
 969#include "locking-selftest-wlock-hardirq.h"
 970GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock)
 971
 
 972#include "locking-selftest-spin-softirq.h"
 973GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin)
 974
 975#include "locking-selftest-rlock-softirq.h"
 976GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock)
 977
 978#include "locking-selftest-wlock-softirq.h"
 979GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock)
 
 980
 981#undef E1
 982#undef E2
 983#undef E3
 984
 985/*
 986 * read-lock / write-lock irq inversion.
 987 *
 988 * Deadlock scenario:
 989 *
 990 * CPU#1 is at #1, i.e. it has write-locked A, but has not
 991 * taken B yet.
 992 *
 993 * CPU#2 is at #2, i.e. it has locked B.
 994 *
 995 * Hardirq hits CPU#2 at point #2 and is trying to read-lock A.
 996 *
 997 * The deadlock occurs because CPU#1 will spin on B, and CPU#2
 998 * will spin on A.
 999 */
1000
1001#define E1()				\
1002					\
1003	IRQ_DISABLE();			\
1004	WL(A);				\
1005	LOCK(B);			\
1006	UNLOCK(B);			\
1007	WU(A);				\
1008	IRQ_ENABLE();
1009
1010#define E2()				\
1011					\
1012	LOCK(B);			\
1013	UNLOCK(B);
1014
1015#define E3()				\
1016					\
1017	IRQ_ENTER();			\
1018	RL(A);				\
1019	RU(A);				\
1020	IRQ_EXIT();
1021
1022/*
1023 * Generate 36 testcases:
1024 */
1025#include "locking-selftest-spin-hardirq.h"
1026GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin)
1027
1028#include "locking-selftest-rlock-hardirq.h"
1029GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock)
1030
1031#include "locking-selftest-wlock-hardirq.h"
1032GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock)
1033
 
1034#include "locking-selftest-spin-softirq.h"
1035GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin)
1036
1037#include "locking-selftest-rlock-softirq.h"
1038GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock)
1039
1040#include "locking-selftest-wlock-softirq.h"
1041GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock)
 
1042
1043#undef E1
1044#undef E2
1045#undef E3
1046
1047/*
1048 * write-read / write-read / write-read deadlock even if read is recursive
1049 */
1050
1051#define E1()				\
1052					\
1053	WL(X1);				\
1054	RL(Y1);				\
1055	RU(Y1);				\
1056	WU(X1);
1057
1058#define E2()				\
1059					\
1060	WL(Y1);				\
1061	RL(Z1);				\
1062	RU(Z1);				\
1063	WU(Y1);
1064
1065#define E3()				\
1066					\
1067	WL(Z1);				\
1068	RL(X1);				\
1069	RU(X1);				\
1070	WU(Z1);
1071
1072#include "locking-selftest-rlock.h"
1073GENERATE_PERMUTATIONS_3_EVENTS(W1R2_W2R3_W3R1)
1074
1075#undef E1
1076#undef E2
1077#undef E3
1078
1079/*
1080 * write-write / read-read / write-read deadlock even if read is recursive
1081 */
1082
1083#define E1()				\
1084					\
1085	WL(X1);				\
1086	WL(Y1);				\
1087	WU(Y1);				\
1088	WU(X1);
1089
1090#define E2()				\
1091					\
1092	RL(Y1);				\
1093	RL(Z1);				\
1094	RU(Z1);				\
1095	RU(Y1);
1096
1097#define E3()				\
1098					\
1099	WL(Z1);				\
1100	RL(X1);				\
1101	RU(X1);				\
1102	WU(Z1);
1103
1104#include "locking-selftest-rlock.h"
1105GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_W3R1)
1106
1107#undef E1
1108#undef E2
1109#undef E3
1110
1111/*
1112 * write-write / read-read / read-write is not deadlock when read is recursive
1113 */
1114
1115#define E1()				\
1116					\
1117	WL(X1);				\
1118	WL(Y1);				\
1119	WU(Y1);				\
1120	WU(X1);
1121
1122#define E2()				\
1123					\
1124	RL(Y1);				\
1125	RL(Z1);				\
1126	RU(Z1);				\
1127	RU(Y1);
1128
1129#define E3()				\
1130					\
1131	RL(Z1);				\
1132	WL(X1);				\
1133	WU(X1);				\
1134	RU(Z1);
1135
1136#include "locking-selftest-rlock.h"
1137GENERATE_PERMUTATIONS_3_EVENTS(W1R2_R2R3_W3W1)
1138
1139#undef E1
1140#undef E2
1141#undef E3
1142
1143/*
1144 * write-read / read-read / write-write is not deadlock when read is recursive
1145 */
1146
1147#define E1()				\
1148					\
1149	WL(X1);				\
1150	RL(Y1);				\
1151	RU(Y1);				\
1152	WU(X1);
1153
1154#define E2()				\
1155					\
1156	RL(Y1);				\
1157	RL(Z1);				\
1158	RU(Z1);				\
1159	RU(Y1);
1160
1161#define E3()				\
1162					\
1163	WL(Z1);				\
1164	WL(X1);				\
1165	WU(X1);				\
1166	WU(Z1);
1167
1168#include "locking-selftest-rlock.h"
1169GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_R3W1)
1170
1171#undef E1
1172#undef E2
1173#undef E3
1174/*
1175 * read-lock / write-lock recursion that is actually safe.
1176 */
1177
1178#define E1()				\
1179					\
1180	IRQ_DISABLE();			\
1181	WL(A);				\
1182	WU(A);				\
1183	IRQ_ENABLE();
1184
1185#define E2()				\
1186					\
1187	RL(A);				\
1188	RU(A);				\
1189
1190#define E3()				\
1191					\
1192	IRQ_ENTER();			\
1193	LOCK(A);			\
1194	L(B);				\
1195	U(B);				\
1196	UNLOCK(A);			\
1197	IRQ_EXIT();
1198
1199/*
1200 * Generate 24 testcases:
1201 */
1202#include "locking-selftest-hardirq.h"
1203#include "locking-selftest-rlock.h"
1204GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_rlock)
1205
1206#include "locking-selftest-wlock.h"
1207GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_wlock)
1208
 
1209#include "locking-selftest-softirq.h"
1210#include "locking-selftest-rlock.h"
1211GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_rlock)
1212
1213#include "locking-selftest-wlock.h"
1214GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_wlock)
 
1215
1216#undef E1
1217#undef E2
1218#undef E3
1219
1220/*
1221 * read-lock / write-lock recursion that is unsafe.
1222 */
1223
1224#define E1()				\
1225					\
1226	IRQ_DISABLE();			\
1227	L(B);				\
1228	LOCK(A);			\
1229	UNLOCK(A);			\
1230	U(B);				\
1231	IRQ_ENABLE();
1232
1233#define E2()				\
1234					\
1235	RL(A);				\
1236	RU(A);				\
1237
1238#define E3()				\
1239					\
1240	IRQ_ENTER();			\
1241	L(B);				\
1242	U(B);				\
1243	IRQ_EXIT();
1244
1245/*
1246 * Generate 24 testcases:
1247 */
1248#include "locking-selftest-hardirq.h"
1249#include "locking-selftest-rlock.h"
1250GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_rlock)
1251
1252#include "locking-selftest-wlock.h"
1253GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_wlock)
1254
 
1255#include "locking-selftest-softirq.h"
1256#include "locking-selftest-rlock.h"
1257GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_rlock)
1258
1259#include "locking-selftest-wlock.h"
1260GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_wlock)
 
1261
1262#undef E1
1263#undef E2
1264#undef E3
1265/*
1266 * read-lock / write-lock recursion that is unsafe.
1267 *
1268 * A is a ENABLED_*_READ lock
1269 * B is a USED_IN_*_READ lock
1270 *
1271 * read_lock(A);
1272 *			write_lock(B);
1273 * <interrupt>
1274 * read_lock(B);
1275 * 			write_lock(A); // if this one is read_lock(), no deadlock
1276 */
1277
1278#define E1()				\
1279					\
1280	IRQ_DISABLE();			\
1281	WL(B);				\
1282	LOCK(A);			\
1283	UNLOCK(A);			\
1284	WU(B);				\
1285	IRQ_ENABLE();
1286
1287#define E2()				\
1288					\
1289	RL(A);				\
1290	RU(A);				\
1291
1292#define E3()				\
1293					\
1294	IRQ_ENTER();			\
1295	RL(B);				\
1296	RU(B);				\
1297	IRQ_EXIT();
1298
1299/*
1300 * Generate 24 testcases:
1301 */
1302#include "locking-selftest-hardirq.h"
1303#include "locking-selftest-rlock.h"
1304GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_rlock)
1305
1306#include "locking-selftest-wlock.h"
1307GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_wlock)
1308
 
1309#include "locking-selftest-softirq.h"
1310#include "locking-selftest-rlock.h"
1311GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_rlock)
1312
1313#include "locking-selftest-wlock.h"
1314GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_wlock)
 
1315
1316#ifdef CONFIG_DEBUG_LOCK_ALLOC
1317# define I_SPINLOCK(x)	lockdep_reset_lock(&lock_##x.dep_map)
1318# define I_RAW_SPINLOCK(x)	lockdep_reset_lock(&raw_lock_##x.dep_map)
1319# define I_RWLOCK(x)	lockdep_reset_lock(&rwlock_##x.dep_map)
1320# define I_MUTEX(x)	lockdep_reset_lock(&mutex_##x.dep_map)
1321# define I_RWSEM(x)	lockdep_reset_lock(&rwsem_##x.dep_map)
1322# define I_WW(x)	lockdep_reset_lock(&x.dep_map)
1323# define I_LOCAL_LOCK(x) lockdep_reset_lock(&local_##x.dep_map)
1324#ifdef CONFIG_RT_MUTEXES
1325# define I_RTMUTEX(x)	lockdep_reset_lock(&rtmutex_##x.dep_map)
1326#endif
1327#else
1328# define I_SPINLOCK(x)
1329# define I_RAW_SPINLOCK(x)
1330# define I_RWLOCK(x)
1331# define I_MUTEX(x)
1332# define I_RWSEM(x)
1333# define I_WW(x)
1334# define I_LOCAL_LOCK(x)
1335#endif
1336
1337#ifndef I_RTMUTEX
1338# define I_RTMUTEX(x)
1339#endif
1340
1341#ifdef CONFIG_RT_MUTEXES
1342#define I2_RTMUTEX(x)	rt_mutex_init(&rtmutex_##x)
1343#else
1344#define I2_RTMUTEX(x)
1345#endif
1346
1347#define I1(x)					\
1348	do {					\
1349		I_SPINLOCK(x);			\
1350		I_RWLOCK(x);			\
1351		I_MUTEX(x);			\
1352		I_RWSEM(x);			\
1353		I_RTMUTEX(x);			\
1354	} while (0)
1355
1356#define I2(x)					\
1357	do {					\
1358		spin_lock_init(&lock_##x);	\
1359		rwlock_init(&rwlock_##x);	\
1360		mutex_init(&mutex_##x);		\
1361		init_rwsem(&rwsem_##x);		\
1362		I2_RTMUTEX(x);			\
1363	} while (0)
1364
1365static void reset_locks(void)
1366{
1367	local_irq_disable();
1368	lockdep_free_key_range(&ww_lockdep.acquire_key, 1);
1369	lockdep_free_key_range(&ww_lockdep.mutex_key, 1);
1370
1371	I1(A); I1(B); I1(C); I1(D);
1372	I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2);
1373	I_WW(t); I_WW(t2); I_WW(o.base); I_WW(o2.base); I_WW(o3.base);
1374	I_RAW_SPINLOCK(A); I_RAW_SPINLOCK(B);
1375	I_LOCAL_LOCK(A);
1376
1377	lockdep_reset();
1378
1379	I2(A); I2(B); I2(C); I2(D);
1380	init_shared_classes();
1381	raw_spin_lock_init(&raw_lock_A);
1382	raw_spin_lock_init(&raw_lock_B);
1383	local_lock_init(&local_A);
1384
1385	ww_mutex_init(&o, &ww_lockdep); ww_mutex_init(&o2, &ww_lockdep); ww_mutex_init(&o3, &ww_lockdep);
1386	memset(&t, 0, sizeof(t)); memset(&t2, 0, sizeof(t2));
1387	memset(&ww_lockdep.acquire_key, 0, sizeof(ww_lockdep.acquire_key));
1388	memset(&ww_lockdep.mutex_key, 0, sizeof(ww_lockdep.mutex_key));
1389	local_irq_enable();
1390}
1391
1392#undef I
1393
1394static int testcase_total;
1395static int testcase_successes;
1396static int expected_testcase_failures;
1397static int unexpected_testcase_failures;
1398
1399static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
1400{
1401	unsigned long saved_preempt_count = preempt_count();
 
 
 
 
 
 
1402
1403	WARN_ON(irqs_disabled());
1404
1405	debug_locks_silent = !(debug_locks_verbose & lockclass_mask);
1406
1407	testcase_fn();
1408	/*
1409	 * Filter out expected failures:
1410	 */
1411#ifndef CONFIG_PROVE_LOCKING
1412	if (expected == FAILURE && debug_locks) {
1413		expected_testcase_failures++;
1414		pr_cont("failed|");
1415	}
1416	else
1417#endif
1418	if (debug_locks != expected) {
1419		unexpected_testcase_failures++;
1420		pr_cont("FAILED|");
1421	} else {
1422		testcase_successes++;
1423		pr_cont("  ok  |");
1424	}
1425	testcase_total++;
1426
1427	if (debug_locks_verbose & lockclass_mask)
1428		pr_cont(" lockclass mask: %x, debug_locks: %d, expected: %d\n",
1429			lockclass_mask, debug_locks, expected);
1430	/*
1431	 * Some tests (e.g. double-unlock) might corrupt the preemption
1432	 * count, so restore it:
1433	 */
1434	preempt_count_set(saved_preempt_count);
 
 
 
 
 
 
 
 
 
 
 
 
1435#ifdef CONFIG_TRACE_IRQFLAGS
1436	if (softirq_count())
1437		current->softirqs_enabled = 0;
1438	else
1439		current->softirqs_enabled = 1;
1440#endif
1441
1442	reset_locks();
1443}
1444
1445#ifdef CONFIG_RT_MUTEXES
1446#define dotest_rt(fn, e, m)	dotest((fn), (e), (m))
1447#else
1448#define dotest_rt(fn, e, m)
1449#endif
1450
1451static inline void print_testname(const char *testname)
1452{
1453	printk("%33s:", testname);
1454}
1455
1456#define DO_TESTCASE_1(desc, name, nr)				\
1457	print_testname(desc"/"#nr);				\
1458	dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK);		\
1459	pr_cont("\n");
1460
1461#define DO_TESTCASE_1B(desc, name, nr)				\
1462	print_testname(desc"/"#nr);				\
1463	dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK);		\
1464	pr_cont("\n");
1465
1466#define DO_TESTCASE_1RR(desc, name, nr)				\
1467	print_testname(desc"/"#nr);				\
1468	pr_cont("             |");				\
1469	dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK);		\
1470	pr_cont("\n");
1471
1472#define DO_TESTCASE_1RRB(desc, name, nr)			\
1473	print_testname(desc"/"#nr);				\
1474	pr_cont("             |");				\
1475	dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK);		\
1476	pr_cont("\n");
1477
1478
1479#define DO_TESTCASE_3(desc, name, nr)				\
1480	print_testname(desc"/"#nr);				\
1481	dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN);	\
1482	dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);	\
1483	dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);	\
1484	pr_cont("\n");
1485
1486#define DO_TESTCASE_3RW(desc, name, nr)				\
1487	print_testname(desc"/"#nr);				\
1488	dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\
1489	dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);	\
1490	dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);	\
1491	pr_cont("\n");
1492
1493#define DO_TESTCASE_2RW(desc, name, nr)				\
1494	print_testname(desc"/"#nr);				\
1495	pr_cont("      |");					\
1496	dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);	\
1497	dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);	\
1498	pr_cont("\n");
1499
1500#define DO_TESTCASE_2x2RW(desc, name, nr)			\
1501	DO_TESTCASE_2RW("hard-"desc, name##_hard, nr)		\
1502	DO_TESTCASE_2RW("soft-"desc, name##_soft, nr)		\
1503
1504#define DO_TESTCASE_6x2x2RW(desc, name)				\
1505	DO_TESTCASE_2x2RW(desc, name, 123);			\
1506	DO_TESTCASE_2x2RW(desc, name, 132);			\
1507	DO_TESTCASE_2x2RW(desc, name, 213);			\
1508	DO_TESTCASE_2x2RW(desc, name, 231);			\
1509	DO_TESTCASE_2x2RW(desc, name, 312);			\
1510	DO_TESTCASE_2x2RW(desc, name, 321);
1511
1512#define DO_TESTCASE_6(desc, name)				\
1513	print_testname(desc);					\
1514	dotest(name##_spin, FAILURE, LOCKTYPE_SPIN);		\
1515	dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK);		\
1516	dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK);		\
1517	dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX);		\
1518	dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM);		\
1519	dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM);		\
1520	dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX);	\
1521	pr_cont("\n");
1522
1523#define DO_TESTCASE_6_SUCCESS(desc, name)			\
1524	print_testname(desc);					\
1525	dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN);		\
1526	dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK);		\
1527	dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK);		\
1528	dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX);		\
1529	dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM);		\
1530	dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM);		\
1531	dotest_rt(name##_rtmutex, SUCCESS, LOCKTYPE_RTMUTEX);	\
1532	pr_cont("\n");
1533
1534/*
1535 * 'read' variant: rlocks must not trigger.
1536 */
1537#define DO_TESTCASE_6R(desc, name)				\
1538	print_testname(desc);					\
1539	dotest(name##_spin, FAILURE, LOCKTYPE_SPIN);		\
1540	dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK);		\
1541	dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK);		\
1542	dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX);		\
1543	dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM);		\
1544	dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM);		\
1545	dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX);	\
1546	pr_cont("\n");
1547
1548#define DO_TESTCASE_2I(desc, name, nr)				\
1549	DO_TESTCASE_1("hard-"desc, name##_hard, nr);		\
1550	DO_TESTCASE_1("soft-"desc, name##_soft, nr);
1551
1552#define DO_TESTCASE_2IB(desc, name, nr)				\
1553	DO_TESTCASE_1B("hard-"desc, name##_hard, nr);		\
1554	DO_TESTCASE_1B("soft-"desc, name##_soft, nr);
1555
1556#define DO_TESTCASE_6I(desc, name, nr)				\
1557	DO_TESTCASE_3("hard-"desc, name##_hard, nr);		\
1558	DO_TESTCASE_3("soft-"desc, name##_soft, nr);
1559
1560#define DO_TESTCASE_6IRW(desc, name, nr)			\
1561	DO_TESTCASE_3RW("hard-"desc, name##_hard, nr);		\
1562	DO_TESTCASE_3RW("soft-"desc, name##_soft, nr);
1563
1564#define DO_TESTCASE_2x3(desc, name)				\
1565	DO_TESTCASE_3(desc, name, 12);				\
1566	DO_TESTCASE_3(desc, name, 21);
1567
1568#define DO_TESTCASE_2x6(desc, name)				\
1569	DO_TESTCASE_6I(desc, name, 12);				\
1570	DO_TESTCASE_6I(desc, name, 21);
1571
1572#define DO_TESTCASE_6x2(desc, name)				\
1573	DO_TESTCASE_2I(desc, name, 123);			\
1574	DO_TESTCASE_2I(desc, name, 132);			\
1575	DO_TESTCASE_2I(desc, name, 213);			\
1576	DO_TESTCASE_2I(desc, name, 231);			\
1577	DO_TESTCASE_2I(desc, name, 312);			\
1578	DO_TESTCASE_2I(desc, name, 321);
1579
1580#define DO_TESTCASE_6x2B(desc, name)				\
1581	DO_TESTCASE_2IB(desc, name, 123);			\
1582	DO_TESTCASE_2IB(desc, name, 132);			\
1583	DO_TESTCASE_2IB(desc, name, 213);			\
1584	DO_TESTCASE_2IB(desc, name, 231);			\
1585	DO_TESTCASE_2IB(desc, name, 312);			\
1586	DO_TESTCASE_2IB(desc, name, 321);
1587
1588#define DO_TESTCASE_6x1RR(desc, name)				\
1589	DO_TESTCASE_1RR(desc, name, 123);			\
1590	DO_TESTCASE_1RR(desc, name, 132);			\
1591	DO_TESTCASE_1RR(desc, name, 213);			\
1592	DO_TESTCASE_1RR(desc, name, 231);			\
1593	DO_TESTCASE_1RR(desc, name, 312);			\
1594	DO_TESTCASE_1RR(desc, name, 321);
1595
1596#define DO_TESTCASE_6x1RRB(desc, name)				\
1597	DO_TESTCASE_1RRB(desc, name, 123);			\
1598	DO_TESTCASE_1RRB(desc, name, 132);			\
1599	DO_TESTCASE_1RRB(desc, name, 213);			\
1600	DO_TESTCASE_1RRB(desc, name, 231);			\
1601	DO_TESTCASE_1RRB(desc, name, 312);			\
1602	DO_TESTCASE_1RRB(desc, name, 321);
1603
1604#define DO_TESTCASE_6x6(desc, name)				\
1605	DO_TESTCASE_6I(desc, name, 123);			\
1606	DO_TESTCASE_6I(desc, name, 132);			\
1607	DO_TESTCASE_6I(desc, name, 213);			\
1608	DO_TESTCASE_6I(desc, name, 231);			\
1609	DO_TESTCASE_6I(desc, name, 312);			\
1610	DO_TESTCASE_6I(desc, name, 321);
1611
1612#define DO_TESTCASE_6x6RW(desc, name)				\
1613	DO_TESTCASE_6IRW(desc, name, 123);			\
1614	DO_TESTCASE_6IRW(desc, name, 132);			\
1615	DO_TESTCASE_6IRW(desc, name, 213);			\
1616	DO_TESTCASE_6IRW(desc, name, 231);			\
1617	DO_TESTCASE_6IRW(desc, name, 312);			\
1618	DO_TESTCASE_6IRW(desc, name, 321);
1619
1620static void ww_test_fail_acquire(void)
1621{
1622	int ret;
1623
1624	WWAI(&t);
1625	t.stamp++;
1626
1627	ret = WWL(&o, &t);
1628
1629	if (WARN_ON(!o.ctx) ||
1630	    WARN_ON(ret))
1631		return;
1632
1633	/* No lockdep test, pure API */
1634	ret = WWL(&o, &t);
1635	WARN_ON(ret != -EALREADY);
1636
1637	ret = WWT(&o);
1638	WARN_ON(ret);
1639
1640	t2 = t;
1641	t2.stamp++;
1642	ret = WWL(&o, &t2);
1643	WARN_ON(ret != -EDEADLK);
1644	WWU(&o);
1645
1646	if (WWT(&o))
1647		WWU(&o);
1648#ifdef CONFIG_DEBUG_LOCK_ALLOC
1649	else
1650		DEBUG_LOCKS_WARN_ON(1);
1651#endif
1652}
1653
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1654static void ww_test_normal(void)
1655{
1656	int ret;
1657
1658	WWAI(&t);
1659
1660	/*
1661	 * None of the ww_mutex codepaths should be taken in the 'normal'
1662	 * mutex calls. The easiest way to verify this is by using the
1663	 * normal mutex calls, and making sure o.ctx is unmodified.
1664	 */
1665
1666	/* mutex_lock (and indirectly, mutex_lock_nested) */
1667	o.ctx = (void *)~0UL;
1668	mutex_lock(&o.base);
1669	mutex_unlock(&o.base);
1670	WARN_ON(o.ctx != (void *)~0UL);
1671
1672	/* mutex_lock_interruptible (and *_nested) */
1673	o.ctx = (void *)~0UL;
1674	ret = mutex_lock_interruptible(&o.base);
1675	if (!ret)
1676		mutex_unlock(&o.base);
1677	else
1678		WARN_ON(1);
1679	WARN_ON(o.ctx != (void *)~0UL);
1680
1681	/* mutex_lock_killable (and *_nested) */
1682	o.ctx = (void *)~0UL;
1683	ret = mutex_lock_killable(&o.base);
1684	if (!ret)
1685		mutex_unlock(&o.base);
1686	else
1687		WARN_ON(1);
1688	WARN_ON(o.ctx != (void *)~0UL);
1689
1690	/* trylock, succeeding */
1691	o.ctx = (void *)~0UL;
1692	ret = mutex_trylock(&o.base);
1693	WARN_ON(!ret);
1694	if (ret)
1695		mutex_unlock(&o.base);
1696	else
1697		WARN_ON(1);
1698	WARN_ON(o.ctx != (void *)~0UL);
1699
1700	/* trylock, failing */
1701	o.ctx = (void *)~0UL;
1702	mutex_lock(&o.base);
1703	ret = mutex_trylock(&o.base);
1704	WARN_ON(ret);
1705	mutex_unlock(&o.base);
1706	WARN_ON(o.ctx != (void *)~0UL);
1707
 
 
1708	/* nest_lock */
1709	o.ctx = (void *)~0UL;
1710	mutex_lock_nest_lock(&o.base, &t);
1711	mutex_unlock(&o.base);
1712	WARN_ON(o.ctx != (void *)~0UL);
1713}
1714
1715static void ww_test_two_contexts(void)
1716{
1717	WWAI(&t);
1718	WWAI(&t2);
1719}
1720
1721static void ww_test_diff_class(void)
1722{
1723	WWAI(&t);
1724#ifdef CONFIG_DEBUG_MUTEXES
1725	t.ww_class = NULL;
1726#endif
1727	WWL(&o, &t);
1728}
1729
1730static void ww_test_context_done_twice(void)
1731{
1732	WWAI(&t);
1733	WWAD(&t);
1734	WWAD(&t);
1735	WWAF(&t);
1736}
1737
1738static void ww_test_context_unlock_twice(void)
1739{
1740	WWAI(&t);
1741	WWAD(&t);
1742	WWAF(&t);
1743	WWAF(&t);
1744}
1745
1746static void ww_test_context_fini_early(void)
1747{
1748	WWAI(&t);
1749	WWL(&o, &t);
1750	WWAD(&t);
1751	WWAF(&t);
1752}
1753
1754static void ww_test_context_lock_after_done(void)
1755{
1756	WWAI(&t);
1757	WWAD(&t);
1758	WWL(&o, &t);
1759}
1760
1761static void ww_test_object_unlock_twice(void)
1762{
1763	WWL1(&o);
1764	WWU(&o);
1765	WWU(&o);
1766}
1767
1768static void ww_test_object_lock_unbalanced(void)
1769{
1770	WWAI(&t);
1771	WWL(&o, &t);
1772	t.acquired = 0;
1773	WWU(&o);
1774	WWAF(&t);
1775}
1776
1777static void ww_test_object_lock_stale_context(void)
1778{
1779	WWAI(&t);
1780	o.ctx = &t2;
1781	WWL(&o, &t);
1782}
1783
1784static void ww_test_edeadlk_normal(void)
1785{
1786	int ret;
1787
1788	mutex_lock(&o2.base);
1789	o2.ctx = &t2;
1790	mutex_release(&o2.base.dep_map, _THIS_IP_);
1791
1792	WWAI(&t);
1793	t2 = t;
1794	t2.stamp--;
1795
1796	ret = WWL(&o, &t);
1797	WARN_ON(ret);
1798
1799	ret = WWL(&o2, &t);
1800	WARN_ON(ret != -EDEADLK);
1801
1802	o2.ctx = NULL;
1803	mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1804	mutex_unlock(&o2.base);
1805	WWU(&o);
1806
1807	WWL(&o2, &t);
1808}
1809
1810static void ww_test_edeadlk_normal_slow(void)
1811{
1812	int ret;
1813
1814	mutex_lock(&o2.base);
1815	mutex_release(&o2.base.dep_map, _THIS_IP_);
1816	o2.ctx = &t2;
1817
1818	WWAI(&t);
1819	t2 = t;
1820	t2.stamp--;
1821
1822	ret = WWL(&o, &t);
1823	WARN_ON(ret);
1824
1825	ret = WWL(&o2, &t);
1826	WARN_ON(ret != -EDEADLK);
1827
1828	o2.ctx = NULL;
1829	mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1830	mutex_unlock(&o2.base);
1831	WWU(&o);
1832
1833	ww_mutex_lock_slow(&o2, &t);
1834}
1835
1836static void ww_test_edeadlk_no_unlock(void)
1837{
1838	int ret;
1839
1840	mutex_lock(&o2.base);
1841	o2.ctx = &t2;
1842	mutex_release(&o2.base.dep_map, _THIS_IP_);
1843
1844	WWAI(&t);
1845	t2 = t;
1846	t2.stamp--;
1847
1848	ret = WWL(&o, &t);
1849	WARN_ON(ret);
1850
1851	ret = WWL(&o2, &t);
1852	WARN_ON(ret != -EDEADLK);
1853
1854	o2.ctx = NULL;
1855	mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1856	mutex_unlock(&o2.base);
1857
1858	WWL(&o2, &t);
1859}
1860
1861static void ww_test_edeadlk_no_unlock_slow(void)
1862{
1863	int ret;
1864
1865	mutex_lock(&o2.base);
1866	mutex_release(&o2.base.dep_map, _THIS_IP_);
1867	o2.ctx = &t2;
1868
1869	WWAI(&t);
1870	t2 = t;
1871	t2.stamp--;
1872
1873	ret = WWL(&o, &t);
1874	WARN_ON(ret);
1875
1876	ret = WWL(&o2, &t);
1877	WARN_ON(ret != -EDEADLK);
1878
1879	o2.ctx = NULL;
1880	mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1881	mutex_unlock(&o2.base);
1882
1883	ww_mutex_lock_slow(&o2, &t);
1884}
1885
1886static void ww_test_edeadlk_acquire_more(void)
1887{
1888	int ret;
1889
1890	mutex_lock(&o2.base);
1891	mutex_release(&o2.base.dep_map, _THIS_IP_);
1892	o2.ctx = &t2;
1893
1894	WWAI(&t);
1895	t2 = t;
1896	t2.stamp--;
1897
1898	ret = WWL(&o, &t);
1899	WARN_ON(ret);
1900
1901	ret = WWL(&o2, &t);
1902	WARN_ON(ret != -EDEADLK);
1903
1904	ret = WWL(&o3, &t);
1905}
1906
1907static void ww_test_edeadlk_acquire_more_slow(void)
1908{
1909	int ret;
1910
1911	mutex_lock(&o2.base);
1912	mutex_release(&o2.base.dep_map, _THIS_IP_);
1913	o2.ctx = &t2;
1914
1915	WWAI(&t);
1916	t2 = t;
1917	t2.stamp--;
1918
1919	ret = WWL(&o, &t);
1920	WARN_ON(ret);
1921
1922	ret = WWL(&o2, &t);
1923	WARN_ON(ret != -EDEADLK);
1924
1925	ww_mutex_lock_slow(&o3, &t);
1926}
1927
1928static void ww_test_edeadlk_acquire_more_edeadlk(void)
1929{
1930	int ret;
1931
1932	mutex_lock(&o2.base);
1933	mutex_release(&o2.base.dep_map, _THIS_IP_);
1934	o2.ctx = &t2;
1935
1936	mutex_lock(&o3.base);
1937	mutex_release(&o3.base.dep_map, _THIS_IP_);
1938	o3.ctx = &t2;
1939
1940	WWAI(&t);
1941	t2 = t;
1942	t2.stamp--;
1943
1944	ret = WWL(&o, &t);
1945	WARN_ON(ret);
1946
1947	ret = WWL(&o2, &t);
1948	WARN_ON(ret != -EDEADLK);
1949
1950	ret = WWL(&o3, &t);
1951	WARN_ON(ret != -EDEADLK);
1952}
1953
1954static void ww_test_edeadlk_acquire_more_edeadlk_slow(void)
1955{
1956	int ret;
1957
1958	mutex_lock(&o2.base);
1959	mutex_release(&o2.base.dep_map, _THIS_IP_);
1960	o2.ctx = &t2;
1961
1962	mutex_lock(&o3.base);
1963	mutex_release(&o3.base.dep_map, _THIS_IP_);
1964	o3.ctx = &t2;
1965
1966	WWAI(&t);
1967	t2 = t;
1968	t2.stamp--;
1969
1970	ret = WWL(&o, &t);
1971	WARN_ON(ret);
1972
1973	ret = WWL(&o2, &t);
1974	WARN_ON(ret != -EDEADLK);
1975
1976	ww_mutex_lock_slow(&o3, &t);
1977}
1978
1979static void ww_test_edeadlk_acquire_wrong(void)
1980{
1981	int ret;
1982
1983	mutex_lock(&o2.base);
1984	mutex_release(&o2.base.dep_map, _THIS_IP_);
1985	o2.ctx = &t2;
1986
1987	WWAI(&t);
1988	t2 = t;
1989	t2.stamp--;
1990
1991	ret = WWL(&o, &t);
1992	WARN_ON(ret);
1993
1994	ret = WWL(&o2, &t);
1995	WARN_ON(ret != -EDEADLK);
1996	if (!ret)
1997		WWU(&o2);
1998
1999	WWU(&o);
2000
2001	ret = WWL(&o3, &t);
2002}
2003
2004static void ww_test_edeadlk_acquire_wrong_slow(void)
2005{
2006	int ret;
2007
2008	mutex_lock(&o2.base);
2009	mutex_release(&o2.base.dep_map, _THIS_IP_);
2010	o2.ctx = &t2;
2011
2012	WWAI(&t);
2013	t2 = t;
2014	t2.stamp--;
2015
2016	ret = WWL(&o, &t);
2017	WARN_ON(ret);
2018
2019	ret = WWL(&o2, &t);
2020	WARN_ON(ret != -EDEADLK);
2021	if (!ret)
2022		WWU(&o2);
2023
2024	WWU(&o);
2025
2026	ww_mutex_lock_slow(&o3, &t);
2027}
2028
2029static void ww_test_spin_nest_unlocked(void)
2030{
2031	spin_lock_nest_lock(&lock_A, &o.base);
2032	U(A);
2033}
2034
2035/* This is not a deadlock, because we have X1 to serialize Y1 and Y2 */
2036static void ww_test_spin_nest_lock(void)
2037{
2038	spin_lock(&lock_X1);
2039	spin_lock_nest_lock(&lock_Y1, &lock_X1);
2040	spin_lock(&lock_A);
2041	spin_lock_nest_lock(&lock_Y2, &lock_X1);
2042	spin_unlock(&lock_A);
2043	spin_unlock(&lock_Y2);
2044	spin_unlock(&lock_Y1);
2045	spin_unlock(&lock_X1);
2046}
2047
2048static void ww_test_unneeded_slow(void)
2049{
2050	WWAI(&t);
2051
2052	ww_mutex_lock_slow(&o, &t);
2053}
2054
2055static void ww_test_context_block(void)
2056{
2057	int ret;
2058
2059	WWAI(&t);
2060
2061	ret = WWL(&o, &t);
2062	WARN_ON(ret);
2063	WWL1(&o2);
2064}
2065
2066static void ww_test_context_try(void)
2067{
2068	int ret;
2069
2070	WWAI(&t);
2071
2072	ret = WWL(&o, &t);
2073	WARN_ON(ret);
2074
2075	ret = WWT(&o2);
2076	WARN_ON(!ret);
2077	WWU(&o2);
2078	WWU(&o);
2079}
2080
2081static void ww_test_context_context(void)
2082{
2083	int ret;
2084
2085	WWAI(&t);
2086
2087	ret = WWL(&o, &t);
2088	WARN_ON(ret);
2089
2090	ret = WWL(&o2, &t);
2091	WARN_ON(ret);
2092
2093	WWU(&o2);
2094	WWU(&o);
2095}
2096
2097static void ww_test_try_block(void)
2098{
2099	bool ret;
2100
2101	ret = WWT(&o);
2102	WARN_ON(!ret);
2103
2104	WWL1(&o2);
2105	WWU(&o2);
2106	WWU(&o);
2107}
2108
2109static void ww_test_try_try(void)
2110{
2111	bool ret;
2112
2113	ret = WWT(&o);
2114	WARN_ON(!ret);
2115	ret = WWT(&o2);
2116	WARN_ON(!ret);
2117	WWU(&o2);
2118	WWU(&o);
2119}
2120
2121static void ww_test_try_context(void)
2122{
2123	int ret;
2124
2125	ret = WWT(&o);
2126	WARN_ON(!ret);
2127
2128	WWAI(&t);
2129
2130	ret = WWL(&o2, &t);
2131	WARN_ON(ret);
2132}
2133
2134static void ww_test_block_block(void)
2135{
2136	WWL1(&o);
2137	WWL1(&o2);
2138}
2139
2140static void ww_test_block_try(void)
2141{
2142	bool ret;
2143
2144	WWL1(&o);
2145	ret = WWT(&o2);
2146	WARN_ON(!ret);
2147}
2148
2149static void ww_test_block_context(void)
2150{
2151	int ret;
2152
2153	WWL1(&o);
2154	WWAI(&t);
2155
2156	ret = WWL(&o2, &t);
2157	WARN_ON(ret);
2158}
2159
2160static void ww_test_spin_block(void)
2161{
2162	L(A);
2163	U(A);
2164
2165	WWL1(&o);
2166	L(A);
2167	U(A);
2168	WWU(&o);
2169
2170	L(A);
2171	WWL1(&o);
2172	WWU(&o);
2173	U(A);
2174}
2175
2176static void ww_test_spin_try(void)
2177{
2178	bool ret;
2179
2180	L(A);
2181	U(A);
2182
2183	ret = WWT(&o);
2184	WARN_ON(!ret);
2185	L(A);
2186	U(A);
2187	WWU(&o);
2188
2189	L(A);
2190	ret = WWT(&o);
2191	WARN_ON(!ret);
2192	WWU(&o);
2193	U(A);
2194}
2195
2196static void ww_test_spin_context(void)
2197{
2198	int ret;
2199
2200	L(A);
2201	U(A);
2202
2203	WWAI(&t);
2204
2205	ret = WWL(&o, &t);
2206	WARN_ON(ret);
2207	L(A);
2208	U(A);
2209	WWU(&o);
2210
2211	L(A);
2212	ret = WWL(&o, &t);
2213	WARN_ON(ret);
2214	WWU(&o);
2215	U(A);
2216}
2217
2218static void ww_tests(void)
2219{
2220	printk("  --------------------------------------------------------------------------\n");
2221	printk("  | Wound/wait tests |\n");
2222	printk("  ---------------------\n");
2223
2224	print_testname("ww api failures");
2225	dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW);
2226	dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW);
2227	dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW);
2228	pr_cont("\n");
2229
2230	print_testname("ww contexts mixing");
2231	dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW);
2232	dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW);
2233	pr_cont("\n");
2234
2235	print_testname("finishing ww context");
2236	dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW);
2237	dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW);
2238	dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW);
2239	dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW);
2240	pr_cont("\n");
2241
2242	print_testname("locking mismatches");
2243	dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW);
2244	dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW);
2245	dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW);
2246	pr_cont("\n");
2247
2248	print_testname("EDEADLK handling");
2249	dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW);
2250	dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW);
2251	dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW);
2252	dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW);
2253	dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW);
2254	dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW);
2255	dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW);
2256	dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW);
2257	dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW);
2258	dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW);
2259	pr_cont("\n");
2260
2261	print_testname("spinlock nest unlocked");
2262	dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW);
2263	pr_cont("\n");
2264
2265	print_testname("spinlock nest test");
2266	dotest(ww_test_spin_nest_lock, SUCCESS, LOCKTYPE_WW);
2267	pr_cont("\n");
2268
2269	printk("  -----------------------------------------------------\n");
2270	printk("                                 |block | try  |context|\n");
2271	printk("  -----------------------------------------------------\n");
2272
2273	print_testname("context");
2274	dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW);
2275	dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW);
2276	dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW);
2277	pr_cont("\n");
2278
2279	print_testname("try");
2280	dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW);
2281	dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW);
2282	dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW);
2283	pr_cont("\n");
2284
2285	print_testname("block");
2286	dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW);
2287	dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW);
2288	dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW);
2289	pr_cont("\n");
2290
2291	print_testname("spinlock");
2292	dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW);
2293	dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW);
2294	dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW);
2295	pr_cont("\n");
2296}
2297
2298
2299/*
2300 * <in hardirq handler>
2301 * read_lock(&A);
2302 *			<hardirq disable>
2303 *			spin_lock(&B);
2304 * spin_lock(&B);
2305 *			read_lock(&A);
2306 *
2307 * is a deadlock.
2308 */
2309static void queued_read_lock_hardirq_RE_Er(void)
2310{
2311	HARDIRQ_ENTER();
2312	read_lock(&rwlock_A);
2313	LOCK(B);
2314	UNLOCK(B);
2315	read_unlock(&rwlock_A);
2316	HARDIRQ_EXIT();
2317
2318	HARDIRQ_DISABLE();
2319	LOCK(B);
2320	read_lock(&rwlock_A);
2321	read_unlock(&rwlock_A);
2322	UNLOCK(B);
2323	HARDIRQ_ENABLE();
2324}
2325
2326/*
2327 * <in hardirq handler>
2328 * spin_lock(&B);
2329 *			<hardirq disable>
2330 *			read_lock(&A);
2331 * read_lock(&A);
2332 *			spin_lock(&B);
2333 *
2334 * is not a deadlock.
2335 */
2336static void queued_read_lock_hardirq_ER_rE(void)
2337{
2338	HARDIRQ_ENTER();
2339	LOCK(B);
2340	read_lock(&rwlock_A);
2341	read_unlock(&rwlock_A);
2342	UNLOCK(B);
2343	HARDIRQ_EXIT();
2344
2345	HARDIRQ_DISABLE();
2346	read_lock(&rwlock_A);
2347	LOCK(B);
2348	UNLOCK(B);
2349	read_unlock(&rwlock_A);
2350	HARDIRQ_ENABLE();
2351}
2352
2353/*
2354 * <hardirq disable>
2355 * spin_lock(&B);
2356 *			read_lock(&A);
2357 *			<in hardirq handler>
2358 *			spin_lock(&B);
2359 * read_lock(&A);
2360 *
2361 * is a deadlock. Because the two read_lock()s are both non-recursive readers.
2362 */
2363static void queued_read_lock_hardirq_inversion(void)
2364{
2365
2366	HARDIRQ_ENTER();
2367	LOCK(B);
2368	UNLOCK(B);
2369	HARDIRQ_EXIT();
2370
2371	HARDIRQ_DISABLE();
2372	LOCK(B);
2373	read_lock(&rwlock_A);
2374	read_unlock(&rwlock_A);
2375	UNLOCK(B);
2376	HARDIRQ_ENABLE();
2377
2378	read_lock(&rwlock_A);
2379	read_unlock(&rwlock_A);
2380}
2381
2382static void queued_read_lock_tests(void)
2383{
2384	printk("  --------------------------------------------------------------------------\n");
2385	printk("  | queued read lock tests |\n");
2386	printk("  ---------------------------\n");
2387	print_testname("hardirq read-lock/lock-read");
2388	dotest(queued_read_lock_hardirq_RE_Er, FAILURE, LOCKTYPE_RWLOCK);
2389	pr_cont("\n");
2390
2391	print_testname("hardirq lock-read/read-lock");
2392	dotest(queued_read_lock_hardirq_ER_rE, SUCCESS, LOCKTYPE_RWLOCK);
2393	pr_cont("\n");
2394
2395	print_testname("hardirq inversion");
2396	dotest(queued_read_lock_hardirq_inversion, FAILURE, LOCKTYPE_RWLOCK);
2397	pr_cont("\n");
2398}
2399
2400static void fs_reclaim_correct_nesting(void)
2401{
2402	fs_reclaim_acquire(GFP_KERNEL);
2403	might_alloc(GFP_NOFS);
2404	fs_reclaim_release(GFP_KERNEL);
2405}
2406
2407static void fs_reclaim_wrong_nesting(void)
2408{
2409	fs_reclaim_acquire(GFP_KERNEL);
2410	might_alloc(GFP_KERNEL);
2411	fs_reclaim_release(GFP_KERNEL);
2412}
2413
2414static void fs_reclaim_protected_nesting(void)
2415{
2416	unsigned int flags;
2417
2418	fs_reclaim_acquire(GFP_KERNEL);
2419	flags = memalloc_nofs_save();
2420	might_alloc(GFP_KERNEL);
2421	memalloc_nofs_restore(flags);
2422	fs_reclaim_release(GFP_KERNEL);
2423}
2424
2425static void fs_reclaim_tests(void)
2426{
2427	printk("  --------------------\n");
2428	printk("  | fs_reclaim tests |\n");
2429	printk("  --------------------\n");
2430
2431	print_testname("correct nesting");
2432	dotest(fs_reclaim_correct_nesting, SUCCESS, 0);
2433	pr_cont("\n");
2434
2435	print_testname("wrong nesting");
2436	dotest(fs_reclaim_wrong_nesting, FAILURE, 0);
2437	pr_cont("\n");
2438
2439	print_testname("protected nesting");
2440	dotest(fs_reclaim_protected_nesting, SUCCESS, 0);
2441	pr_cont("\n");
2442}
2443
2444#define __guard(cleanup) __maybe_unused __attribute__((__cleanup__(cleanup)))
2445
2446static void hardirq_exit(int *_)
2447{
2448	HARDIRQ_EXIT();
2449}
2450
2451#define HARDIRQ_CONTEXT(name, ...)					\
2452	int hardirq_guard_##name __guard(hardirq_exit);			\
2453	HARDIRQ_ENTER();
2454
2455#define NOTTHREADED_HARDIRQ_CONTEXT(name, ...)				\
2456	int notthreaded_hardirq_guard_##name __guard(hardirq_exit);	\
2457	local_irq_disable();						\
2458	__irq_enter();							\
2459	WARN_ON(!in_irq());
2460
2461static void softirq_exit(int *_)
2462{
2463	SOFTIRQ_EXIT();
2464}
2465
2466#define SOFTIRQ_CONTEXT(name, ...)				\
2467	int softirq_guard_##name __guard(softirq_exit);		\
2468	SOFTIRQ_ENTER();
2469
2470static void rcu_exit(int *_)
2471{
2472	rcu_read_unlock();
2473}
2474
2475#define RCU_CONTEXT(name, ...)					\
2476	int rcu_guard_##name __guard(rcu_exit);			\
2477	rcu_read_lock();
2478
2479static void rcu_bh_exit(int *_)
2480{
2481	rcu_read_unlock_bh();
2482}
2483
2484#define RCU_BH_CONTEXT(name, ...)				\
2485	int rcu_bh_guard_##name __guard(rcu_bh_exit);		\
2486	rcu_read_lock_bh();
2487
2488static void rcu_sched_exit(int *_)
2489{
2490	rcu_read_unlock_sched();
2491}
2492
2493#define RCU_SCHED_CONTEXT(name, ...)				\
2494	int rcu_sched_guard_##name __guard(rcu_sched_exit);	\
2495	rcu_read_lock_sched();
2496
2497static void raw_spinlock_exit(raw_spinlock_t **lock)
2498{
2499	raw_spin_unlock(*lock);
2500}
2501
2502#define RAW_SPINLOCK_CONTEXT(name, lock)						\
2503	raw_spinlock_t *raw_spinlock_guard_##name __guard(raw_spinlock_exit) = &(lock);	\
2504	raw_spin_lock(&(lock));
2505
2506static void spinlock_exit(spinlock_t **lock)
2507{
2508	spin_unlock(*lock);
2509}
2510
2511#define SPINLOCK_CONTEXT(name, lock)						\
2512	spinlock_t *spinlock_guard_##name __guard(spinlock_exit) = &(lock);	\
2513	spin_lock(&(lock));
2514
2515static void mutex_exit(struct mutex **lock)
2516{
2517	mutex_unlock(*lock);
2518}
2519
2520#define MUTEX_CONTEXT(name, lock)					\
2521	struct mutex *mutex_guard_##name __guard(mutex_exit) = &(lock);	\
2522	mutex_lock(&(lock));
2523
2524#define GENERATE_2_CONTEXT_TESTCASE(outer, outer_lock, inner, inner_lock)	\
2525										\
2526static void __maybe_unused inner##_in_##outer(void)				\
2527{										\
2528	outer##_CONTEXT(_, outer_lock);						\
2529	{									\
2530		inner##_CONTEXT(_, inner_lock);					\
2531	}									\
2532}
2533
2534/*
2535 * wait contexts (considering PREEMPT_RT)
2536 *
2537 * o: inner is allowed in outer
2538 * x: inner is disallowed in outer
2539 *
2540 *       \  inner |  RCU  | RAW_SPIN | SPIN | MUTEX
2541 * outer  \       |       |          |      |
2542 * ---------------+-------+----------+------+-------
2543 * HARDIRQ        |   o   |    o     |  o   |  x
2544 * ---------------+-------+----------+------+-------
2545 * NOTTHREADED_IRQ|   o   |    o     |  x   |  x
2546 * ---------------+-------+----------+------+-------
2547 * SOFTIRQ        |   o   |    o     |  o   |  x
2548 * ---------------+-------+----------+------+-------
2549 * RCU            |   o   |    o     |  o   |  x
2550 * ---------------+-------+----------+------+-------
2551 * RCU_BH         |   o   |    o     |  o   |  x
2552 * ---------------+-------+----------+------+-------
2553 * RCU_SCHED      |   o   |    o     |  x   |  x
2554 * ---------------+-------+----------+------+-------
2555 * RAW_SPIN       |   o   |    o     |  x   |  x
2556 * ---------------+-------+----------+------+-------
2557 * SPIN           |   o   |    o     |  o   |  x
2558 * ---------------+-------+----------+------+-------
2559 * MUTEX          |   o   |    o     |  o   |  o
2560 * ---------------+-------+----------+------+-------
2561 */
2562
2563#define GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(inner, inner_lock)		\
2564GENERATE_2_CONTEXT_TESTCASE(HARDIRQ, , inner, inner_lock)			\
2565GENERATE_2_CONTEXT_TESTCASE(NOTTHREADED_HARDIRQ, , inner, inner_lock)		\
2566GENERATE_2_CONTEXT_TESTCASE(SOFTIRQ, , inner, inner_lock)			\
2567GENERATE_2_CONTEXT_TESTCASE(RCU, , inner, inner_lock)				\
2568GENERATE_2_CONTEXT_TESTCASE(RCU_BH, , inner, inner_lock)			\
2569GENERATE_2_CONTEXT_TESTCASE(RCU_SCHED, , inner, inner_lock)			\
2570GENERATE_2_CONTEXT_TESTCASE(RAW_SPINLOCK, raw_lock_A, inner, inner_lock)	\
2571GENERATE_2_CONTEXT_TESTCASE(SPINLOCK, lock_A, inner, inner_lock)		\
2572GENERATE_2_CONTEXT_TESTCASE(MUTEX, mutex_A, inner, inner_lock)
2573
2574GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RCU, )
2575GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RAW_SPINLOCK, raw_lock_B)
2576GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(SPINLOCK, lock_B)
2577GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(MUTEX, mutex_B)
2578
2579/* the outer context allows all kinds of preemption */
2580#define DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(outer)			\
2581	dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK);		\
2582	dotest(RAW_SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN);	\
2583	dotest(SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN);		\
2584	dotest(MUTEX_in_##outer, SUCCESS, LOCKTYPE_MUTEX);		\
2585
2586/*
2587 * the outer context only allows the preemption introduced by spinlock_t (which
2588 * is a sleepable lock for PREEMPT_RT)
2589 */
2590#define DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(outer)		\
2591	dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK);		\
2592	dotest(RAW_SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN);	\
2593	dotest(SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN);		\
2594	dotest(MUTEX_in_##outer, FAILURE, LOCKTYPE_MUTEX);		\
2595
2596/* the outer doesn't allows any kind of preemption */
2597#define DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(outer)			\
2598	dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK);		\
2599	dotest(RAW_SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN);	\
2600	dotest(SPINLOCK_in_##outer, FAILURE, LOCKTYPE_SPIN);		\
2601	dotest(MUTEX_in_##outer, FAILURE, LOCKTYPE_MUTEX);		\
2602
2603static void wait_context_tests(void)
2604{
2605	printk("  --------------------------------------------------------------------------\n");
2606	printk("  | wait context tests |\n");
2607	printk("  --------------------------------------------------------------------------\n");
2608	printk("                                 | rcu  | raw  | spin |mutex |\n");
2609	printk("  --------------------------------------------------------------------------\n");
2610	print_testname("in hardirq context");
2611	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(HARDIRQ);
2612	pr_cont("\n");
2613
2614	print_testname("in hardirq context (not threaded)");
2615	DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(NOTTHREADED_HARDIRQ);
2616	pr_cont("\n");
2617
2618	print_testname("in softirq context");
2619	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SOFTIRQ);
2620	pr_cont("\n");
2621
2622	print_testname("in RCU context");
2623	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU);
2624	pr_cont("\n");
2625
2626	print_testname("in RCU-bh context");
2627	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU_BH);
2628	pr_cont("\n");
2629
2630	print_testname("in RCU-sched context");
2631	DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RCU_SCHED);
2632	pr_cont("\n");
2633
2634	print_testname("in RAW_SPINLOCK context");
2635	DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RAW_SPINLOCK);
2636	pr_cont("\n");
2637
2638	print_testname("in SPINLOCK context");
2639	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SPINLOCK);
2640	pr_cont("\n");
2641
2642	print_testname("in MUTEX context");
2643	DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(MUTEX);
2644	pr_cont("\n");
2645}
2646
2647static void local_lock_2(void)
2648{
2649	local_lock_acquire(&local_A);	/* IRQ-ON */
2650	local_lock_release(&local_A);
2651
2652	HARDIRQ_ENTER();
2653	spin_lock(&lock_A);		/* IN-IRQ */
2654	spin_unlock(&lock_A);
2655	HARDIRQ_EXIT()
2656
2657	HARDIRQ_DISABLE();
2658	spin_lock(&lock_A);
2659	local_lock_acquire(&local_A);	/* IN-IRQ <-> IRQ-ON cycle, false */
2660	local_lock_release(&local_A);
2661	spin_unlock(&lock_A);
2662	HARDIRQ_ENABLE();
2663}
2664
2665static void local_lock_3A(void)
2666{
2667	local_lock_acquire(&local_A);	/* IRQ-ON */
2668	spin_lock(&lock_B);		/* IRQ-ON */
2669	spin_unlock(&lock_B);
2670	local_lock_release(&local_A);
2671
2672	HARDIRQ_ENTER();
2673	spin_lock(&lock_A);		/* IN-IRQ */
2674	spin_unlock(&lock_A);
2675	HARDIRQ_EXIT()
2676
2677	HARDIRQ_DISABLE();
2678	spin_lock(&lock_A);
2679	local_lock_acquire(&local_A);	/* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
2680	local_lock_release(&local_A);
2681	spin_unlock(&lock_A);
2682	HARDIRQ_ENABLE();
2683}
2684
2685static void local_lock_3B(void)
2686{
2687	local_lock_acquire(&local_A);	/* IRQ-ON */
2688	spin_lock(&lock_B);		/* IRQ-ON */
2689	spin_unlock(&lock_B);
2690	local_lock_release(&local_A);
2691
2692	HARDIRQ_ENTER();
2693	spin_lock(&lock_A);		/* IN-IRQ */
2694	spin_unlock(&lock_A);
2695	HARDIRQ_EXIT()
2696
2697	HARDIRQ_DISABLE();
2698	spin_lock(&lock_A);
2699	local_lock_acquire(&local_A);	/* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
2700	local_lock_release(&local_A);
2701	spin_unlock(&lock_A);
2702	HARDIRQ_ENABLE();
2703
2704	HARDIRQ_DISABLE();
2705	spin_lock(&lock_A);
2706	spin_lock(&lock_B);		/* IN-IRQ <-> IRQ-ON cycle, true */
2707	spin_unlock(&lock_B);
2708	spin_unlock(&lock_A);
2709	HARDIRQ_DISABLE();
2710
2711}
2712
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2713static void local_lock_tests(void)
2714{
2715	printk("  --------------------------------------------------------------------------\n");
2716	printk("  | local_lock tests |\n");
2717	printk("  ---------------------\n");
2718
2719	print_testname("local_lock inversion  2");
2720	dotest(local_lock_2, SUCCESS, LOCKTYPE_LL);
2721	pr_cont("\n");
2722
2723	print_testname("local_lock inversion 3A");
2724	dotest(local_lock_3A, SUCCESS, LOCKTYPE_LL);
2725	pr_cont("\n");
2726
2727	print_testname("local_lock inversion 3B");
2728	dotest(local_lock_3B, FAILURE, LOCKTYPE_LL);
2729	pr_cont("\n");
2730}
2731
2732static void hardirq_deadlock_softirq_not_deadlock(void)
2733{
2734	/* mutex_A is hardirq-unsafe and softirq-unsafe */
2735	/* mutex_A -> lock_C */
2736	mutex_lock(&mutex_A);
2737	HARDIRQ_DISABLE();
2738	spin_lock(&lock_C);
2739	spin_unlock(&lock_C);
2740	HARDIRQ_ENABLE();
2741	mutex_unlock(&mutex_A);
2742
2743	/* lock_A is hardirq-safe */
2744	HARDIRQ_ENTER();
2745	spin_lock(&lock_A);
2746	spin_unlock(&lock_A);
2747	HARDIRQ_EXIT();
2748
2749	/* lock_A -> lock_B */
2750	HARDIRQ_DISABLE();
2751	spin_lock(&lock_A);
2752	spin_lock(&lock_B);
2753	spin_unlock(&lock_B);
2754	spin_unlock(&lock_A);
2755	HARDIRQ_ENABLE();
2756
2757	/* lock_B -> lock_C */
2758	HARDIRQ_DISABLE();
2759	spin_lock(&lock_B);
2760	spin_lock(&lock_C);
2761	spin_unlock(&lock_C);
2762	spin_unlock(&lock_B);
2763	HARDIRQ_ENABLE();
2764
2765	/* lock_D is softirq-safe */
2766	SOFTIRQ_ENTER();
2767	spin_lock(&lock_D);
2768	spin_unlock(&lock_D);
2769	SOFTIRQ_EXIT();
2770
2771	/* And lock_D is hardirq-unsafe */
2772	SOFTIRQ_DISABLE();
2773	spin_lock(&lock_D);
2774	spin_unlock(&lock_D);
2775	SOFTIRQ_ENABLE();
2776
2777	/*
2778	 * mutex_A -> lock_C -> lock_D is softirq-unsafe -> softirq-safe, not
2779	 * deadlock.
2780	 *
2781	 * lock_A -> lock_B -> lock_C -> lock_D is hardirq-safe ->
2782	 * hardirq-unsafe, deadlock.
2783	 */
2784	HARDIRQ_DISABLE();
2785	spin_lock(&lock_C);
2786	spin_lock(&lock_D);
2787	spin_unlock(&lock_D);
2788	spin_unlock(&lock_C);
2789	HARDIRQ_ENABLE();
2790}
2791
2792void locking_selftest(void)
2793{
2794	/*
2795	 * Got a locking failure before the selftest ran?
2796	 */
2797	if (!debug_locks) {
2798		printk("----------------------------------\n");
2799		printk("| Locking API testsuite disabled |\n");
2800		printk("----------------------------------\n");
2801		return;
2802	}
2803
2804	/*
2805	 * treats read_lock() as recursive read locks for testing purpose
2806	 */
2807	force_read_lock_recursive = 1;
2808
2809	/*
2810	 * Run the testsuite:
2811	 */
2812	printk("------------------------\n");
2813	printk("| Locking API testsuite:\n");
2814	printk("----------------------------------------------------------------------------\n");
2815	printk("                                 | spin |wlock |rlock |mutex | wsem | rsem |\n");
2816	printk("  --------------------------------------------------------------------------\n");
2817
2818	init_shared_classes();
2819	lockdep_set_selftest_task(current);
2820
2821	DO_TESTCASE_6R("A-A deadlock", AA);
2822	DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
2823	DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA);
2824	DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC);
2825	DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA);
2826	DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA);
2827	DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA);
2828	DO_TESTCASE_6("double unlock", double_unlock);
2829	DO_TESTCASE_6("initialize held", init_held);
2830
2831	printk("  --------------------------------------------------------------------------\n");
2832	print_testname("recursive read-lock");
2833	pr_cont("             |");
2834	dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
2835	pr_cont("             |");
2836	dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
2837	pr_cont("\n");
2838
2839	print_testname("recursive read-lock #2");
2840	pr_cont("             |");
2841	dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK);
2842	pr_cont("             |");
2843	dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
2844	pr_cont("\n");
2845
2846	print_testname("mixed read-write-lock");
2847	pr_cont("             |");
2848	dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK);
2849	pr_cont("             |");
2850	dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM);
2851	pr_cont("\n");
2852
2853	print_testname("mixed write-read-lock");
2854	pr_cont("             |");
2855	dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK);
2856	pr_cont("             |");
2857	dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
2858	pr_cont("\n");
2859
2860	print_testname("mixed read-lock/lock-write ABBA");
2861	pr_cont("             |");
2862	dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
2863	pr_cont("             |");
2864	dotest(rwsem_ABBA1, FAILURE, LOCKTYPE_RWSEM);
2865
2866	print_testname("mixed read-lock/lock-read ABBA");
2867	pr_cont("             |");
2868	dotest(rlock_ABBA2, SUCCESS, LOCKTYPE_RWLOCK);
2869	pr_cont("             |");
2870	dotest(rwsem_ABBA2, FAILURE, LOCKTYPE_RWSEM);
2871
2872	print_testname("mixed write-lock/lock-write ABBA");
2873	pr_cont("             |");
2874	dotest(rlock_ABBA3, FAILURE, LOCKTYPE_RWLOCK);
2875	pr_cont("             |");
2876	dotest(rwsem_ABBA3, FAILURE, LOCKTYPE_RWSEM);
2877
2878	print_testname("chain cached mixed R-L/L-W ABBA");
2879	pr_cont("             |");
2880	dotest(rlock_chaincache_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
2881
2882	DO_TESTCASE_6x1RRB("rlock W1R2/W2R3/W3R1", W1R2_W2R3_W3R1);
2883	DO_TESTCASE_6x1RRB("rlock W1W2/R2R3/W3R1", W1W2_R2R3_W3R1);
2884	DO_TESTCASE_6x1RR("rlock W1W2/R2R3/R3W1", W1W2_R2R3_R3W1);
2885	DO_TESTCASE_6x1RR("rlock W1R2/R2R3/W3W1", W1R2_R2R3_W3W1);
2886
2887	printk("  --------------------------------------------------------------------------\n");
2888
2889	/*
2890	 * irq-context testcases:
2891	 */
2892	DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1);
2893	DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A);
2894	DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B);
2895	DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3);
2896	DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4);
2897	DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion);
2898
2899	DO_TESTCASE_6x2x2RW("irq read-recursion", irq_read_recursion);
2900	DO_TESTCASE_6x2x2RW("irq read-recursion #2", irq_read_recursion2);
2901	DO_TESTCASE_6x2x2RW("irq read-recursion #3", irq_read_recursion3);
2902
2903	ww_tests();
2904
2905	force_read_lock_recursive = 0;
2906	/*
2907	 * queued_read_lock() specific test cases can be put here
2908	 */
2909	if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS))
2910		queued_read_lock_tests();
2911
2912	fs_reclaim_tests();
2913
2914	/* Wait context test cases that are specific for RAW_LOCK_NESTING */
2915	if (IS_ENABLED(CONFIG_PROVE_RAW_LOCK_NESTING))
2916		wait_context_tests();
2917
2918	local_lock_tests();
2919
2920	print_testname("hardirq_unsafe_softirq_safe");
2921	dotest(hardirq_deadlock_softirq_not_deadlock, FAILURE, LOCKTYPE_SPECIAL);
2922	pr_cont("\n");
 
 
2923
2924	if (unexpected_testcase_failures) {
2925		printk("-----------------------------------------------------------------\n");
2926		debug_locks = 0;
2927		printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
2928			unexpected_testcase_failures, testcase_total);
2929		printk("-----------------------------------------------------------------\n");
2930	} else if (expected_testcase_failures && testcase_successes) {
2931		printk("--------------------------------------------------------\n");
2932		printk("%3d out of %3d testcases failed, as expected. |\n",
2933			expected_testcase_failures, testcase_total);
2934		printk("----------------------------------------------------\n");
2935		debug_locks = 1;
2936	} else if (expected_testcase_failures && !testcase_successes) {
2937		printk("--------------------------------------------------------\n");
2938		printk("All %3d testcases failed, as expected. |\n",
2939			expected_testcase_failures);
2940		printk("----------------------------------------\n");
2941		debug_locks = 1;
2942	} else {
2943		printk("-------------------------------------------------------\n");
2944		printk("Good, all %3d testcases passed! |\n",
2945			testcase_successes);
2946		printk("---------------------------------\n");
2947		debug_locks = 1;
2948	}
2949	lockdep_set_selftest_task(NULL);
2950	debug_locks_silent = 0;
2951}
v6.13.7
   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 <mingo@redhat.com>
  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_irq());
 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	int saved_preempt_count = preempt_count();
1433#ifdef CONFIG_PREEMPT_RT
1434#ifdef CONFIG_SMP
1435	int saved_mgd_count = current->migration_disabled;
1436#endif
1437	int saved_rcu_count = current->rcu_read_lock_nesting;
1438#endif
1439
1440	WARN_ON(irqs_disabled());
1441
1442	debug_locks_silent = !(debug_locks_verbose & lockclass_mask);
1443
1444	testcase_fn();
1445	/*
1446	 * Filter out expected failures:
1447	 */
1448#ifndef CONFIG_PROVE_LOCKING
1449	if (expected == FAILURE && debug_locks) {
1450		expected_testcase_failures++;
1451		pr_cont("failed|");
1452	}
1453	else
1454#endif
1455	if (debug_locks != expected) {
1456		unexpected_testcase_failures++;
1457		pr_cont("FAILED|");
1458	} else {
1459		testcase_successes++;
1460		pr_cont("  ok  |");
1461	}
1462	testcase_total++;
1463
1464	if (debug_locks_verbose & lockclass_mask)
1465		pr_cont(" lockclass mask: %x, debug_locks: %d, expected: %d\n",
1466			lockclass_mask, debug_locks, expected);
1467	/*
1468	 * Some tests (e.g. double-unlock) might corrupt the preemption
1469	 * count, so restore it:
1470	 */
1471	preempt_count_set(saved_preempt_count);
1472
1473#ifdef CONFIG_PREEMPT_RT
1474#ifdef CONFIG_SMP
1475	while (current->migration_disabled > saved_mgd_count)
1476		migrate_enable();
1477#endif
1478
1479	while (current->rcu_read_lock_nesting > saved_rcu_count)
1480		rcu_read_unlock();
1481	WARN_ON_ONCE(current->rcu_read_lock_nesting < saved_rcu_count);
1482#endif
1483
1484#ifdef CONFIG_TRACE_IRQFLAGS
1485	if (softirq_count())
1486		current->softirqs_enabled = 0;
1487	else
1488		current->softirqs_enabled = 1;
1489#endif
1490
1491	reset_locks();
1492}
1493
1494#ifdef CONFIG_RT_MUTEXES
1495#define dotest_rt(fn, e, m)	dotest((fn), (e), (m))
1496#else
1497#define dotest_rt(fn, e, m)
1498#endif
1499
1500static inline void print_testname(const char *testname)
1501{
1502	printk("%33s:", testname);
1503}
1504
1505#define DO_TESTCASE_1(desc, name, nr)				\
1506	print_testname(desc"/"#nr);				\
1507	dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK);		\
1508	pr_cont("\n");
1509
1510#define DO_TESTCASE_1B(desc, name, nr)				\
1511	print_testname(desc"/"#nr);				\
1512	dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK);		\
1513	pr_cont("\n");
1514
1515#define DO_TESTCASE_1RR(desc, name, nr)				\
1516	print_testname(desc"/"#nr);				\
1517	pr_cont("             |");				\
1518	dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK);		\
1519	pr_cont("\n");
1520
1521#define DO_TESTCASE_1RRB(desc, name, nr)			\
1522	print_testname(desc"/"#nr);				\
1523	pr_cont("             |");				\
1524	dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK);		\
1525	pr_cont("\n");
1526
1527
1528#define DO_TESTCASE_3(desc, name, nr)				\
1529	print_testname(desc"/"#nr);				\
1530	dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN);	\
1531	dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);	\
1532	dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);	\
1533	pr_cont("\n");
1534
1535#define DO_TESTCASE_3RW(desc, name, nr)				\
1536	print_testname(desc"/"#nr);				\
1537	dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\
1538	dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);	\
1539	dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);	\
1540	pr_cont("\n");
1541
1542#define DO_TESTCASE_2RW(desc, name, nr)				\
1543	print_testname(desc"/"#nr);				\
1544	pr_cont("      |");					\
1545	dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);	\
1546	dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);	\
1547	pr_cont("\n");
1548
1549#define DO_TESTCASE_2x2RW(desc, name, nr)			\
1550	DO_TESTCASE_2RW("hard-"desc, name##_hard, nr)		\
1551	NON_RT(DO_TESTCASE_2RW("soft-"desc, name##_soft, nr))	\
1552
1553#define DO_TESTCASE_6x2x2RW(desc, name)				\
1554	DO_TESTCASE_2x2RW(desc, name, 123);			\
1555	DO_TESTCASE_2x2RW(desc, name, 132);			\
1556	DO_TESTCASE_2x2RW(desc, name, 213);			\
1557	DO_TESTCASE_2x2RW(desc, name, 231);			\
1558	DO_TESTCASE_2x2RW(desc, name, 312);			\
1559	DO_TESTCASE_2x2RW(desc, name, 321);
1560
1561#define DO_TESTCASE_6(desc, name)				\
1562	print_testname(desc);					\
1563	dotest(name##_spin, FAILURE, LOCKTYPE_SPIN);		\
1564	dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK);		\
1565	dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK);		\
1566	dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX);		\
1567	dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM);		\
1568	dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM);		\
1569	dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX);	\
1570	pr_cont("\n");
1571
1572#define DO_TESTCASE_6_SUCCESS(desc, name)			\
1573	print_testname(desc);					\
1574	dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN);		\
1575	dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK);		\
1576	dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK);		\
1577	dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX);		\
1578	dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM);		\
1579	dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM);		\
1580	dotest_rt(name##_rtmutex, SUCCESS, LOCKTYPE_RTMUTEX);	\
1581	pr_cont("\n");
1582
1583/*
1584 * 'read' variant: rlocks must not trigger.
1585 */
1586#define DO_TESTCASE_6R(desc, name)				\
1587	print_testname(desc);					\
1588	dotest(name##_spin, FAILURE, LOCKTYPE_SPIN);		\
1589	dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK);		\
1590	dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK);		\
1591	dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX);		\
1592	dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM);		\
1593	dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM);		\
1594	dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX);	\
1595	pr_cont("\n");
1596
1597#define DO_TESTCASE_2I(desc, name, nr)				\
1598	DO_TESTCASE_1("hard-"desc, name##_hard, nr);		\
1599	NON_RT(DO_TESTCASE_1("soft-"desc, name##_soft, nr));
1600
1601#define DO_TESTCASE_2IB(desc, name, nr)				\
1602	DO_TESTCASE_1B("hard-"desc, name##_hard, nr);		\
1603	NON_RT(DO_TESTCASE_1B("soft-"desc, name##_soft, nr));
1604
1605#define DO_TESTCASE_6I(desc, name, nr)				\
1606	DO_TESTCASE_3("hard-"desc, name##_hard, nr);		\
1607	NON_RT(DO_TESTCASE_3("soft-"desc, name##_soft, nr));
1608
1609#define DO_TESTCASE_6IRW(desc, name, nr)			\
1610	DO_TESTCASE_3RW("hard-"desc, name##_hard, nr);		\
1611	NON_RT(DO_TESTCASE_3RW("soft-"desc, name##_soft, nr));
1612
1613#define DO_TESTCASE_2x3(desc, name)				\
1614	DO_TESTCASE_3(desc, name, 12);				\
1615	DO_TESTCASE_3(desc, name, 21);
1616
1617#define DO_TESTCASE_2x6(desc, name)				\
1618	DO_TESTCASE_6I(desc, name, 12);				\
1619	DO_TESTCASE_6I(desc, name, 21);
1620
1621#define DO_TESTCASE_6x2(desc, name)				\
1622	DO_TESTCASE_2I(desc, name, 123);			\
1623	DO_TESTCASE_2I(desc, name, 132);			\
1624	DO_TESTCASE_2I(desc, name, 213);			\
1625	DO_TESTCASE_2I(desc, name, 231);			\
1626	DO_TESTCASE_2I(desc, name, 312);			\
1627	DO_TESTCASE_2I(desc, name, 321);
1628
1629#define DO_TESTCASE_6x2B(desc, name)				\
1630	DO_TESTCASE_2IB(desc, name, 123);			\
1631	DO_TESTCASE_2IB(desc, name, 132);			\
1632	DO_TESTCASE_2IB(desc, name, 213);			\
1633	DO_TESTCASE_2IB(desc, name, 231);			\
1634	DO_TESTCASE_2IB(desc, name, 312);			\
1635	DO_TESTCASE_2IB(desc, name, 321);
1636
1637#define DO_TESTCASE_6x1RR(desc, name)				\
1638	DO_TESTCASE_1RR(desc, name, 123);			\
1639	DO_TESTCASE_1RR(desc, name, 132);			\
1640	DO_TESTCASE_1RR(desc, name, 213);			\
1641	DO_TESTCASE_1RR(desc, name, 231);			\
1642	DO_TESTCASE_1RR(desc, name, 312);			\
1643	DO_TESTCASE_1RR(desc, name, 321);
1644
1645#define DO_TESTCASE_6x1RRB(desc, name)				\
1646	DO_TESTCASE_1RRB(desc, name, 123);			\
1647	DO_TESTCASE_1RRB(desc, name, 132);			\
1648	DO_TESTCASE_1RRB(desc, name, 213);			\
1649	DO_TESTCASE_1RRB(desc, name, 231);			\
1650	DO_TESTCASE_1RRB(desc, name, 312);			\
1651	DO_TESTCASE_1RRB(desc, name, 321);
1652
1653#define DO_TESTCASE_6x6(desc, name)				\
1654	DO_TESTCASE_6I(desc, name, 123);			\
1655	DO_TESTCASE_6I(desc, name, 132);			\
1656	DO_TESTCASE_6I(desc, name, 213);			\
1657	DO_TESTCASE_6I(desc, name, 231);			\
1658	DO_TESTCASE_6I(desc, name, 312);			\
1659	DO_TESTCASE_6I(desc, name, 321);
1660
1661#define DO_TESTCASE_6x6RW(desc, name)				\
1662	DO_TESTCASE_6IRW(desc, name, 123);			\
1663	DO_TESTCASE_6IRW(desc, name, 132);			\
1664	DO_TESTCASE_6IRW(desc, name, 213);			\
1665	DO_TESTCASE_6IRW(desc, name, 231);			\
1666	DO_TESTCASE_6IRW(desc, name, 312);			\
1667	DO_TESTCASE_6IRW(desc, name, 321);
1668
1669static void ww_test_fail_acquire(void)
1670{
1671	int ret;
1672
1673	WWAI(&t);
1674	t.stamp++;
1675
1676	ret = WWL(&o, &t);
1677
1678	if (WARN_ON(!o.ctx) ||
1679	    WARN_ON(ret))
1680		return;
1681
1682	/* No lockdep test, pure API */
1683	ret = WWL(&o, &t);
1684	WARN_ON(ret != -EALREADY);
1685
1686	ret = WWT(&o);
1687	WARN_ON(ret);
1688
1689	t2 = t;
1690	t2.stamp++;
1691	ret = WWL(&o, &t2);
1692	WARN_ON(ret != -EDEADLK);
1693	WWU(&o);
1694
1695	if (WWT(&o))
1696		WWU(&o);
1697#ifdef CONFIG_DEBUG_LOCK_ALLOC
1698	else
1699		DEBUG_LOCKS_WARN_ON(1);
1700#endif
1701}
1702
1703#ifdef CONFIG_PREEMPT_RT
1704#define ww_mutex_base_lock(b)			rt_mutex_lock(b)
1705#define ww_mutex_base_trylock(b)		rt_mutex_trylock(b)
1706#define ww_mutex_base_lock_nest_lock(b, b2)	rt_mutex_lock_nest_lock(b, b2)
1707#define ww_mutex_base_lock_interruptible(b)	rt_mutex_lock_interruptible(b)
1708#define ww_mutex_base_lock_killable(b)		rt_mutex_lock_killable(b)
1709#define ww_mutex_base_unlock(b)			rt_mutex_unlock(b)
1710#else
1711#define ww_mutex_base_lock(b)			mutex_lock(b)
1712#define ww_mutex_base_trylock(b)		mutex_trylock(b)
1713#define ww_mutex_base_lock_nest_lock(b, b2)	mutex_lock_nest_lock(b, b2)
1714#define ww_mutex_base_lock_interruptible(b)	mutex_lock_interruptible(b)
1715#define ww_mutex_base_lock_killable(b)		mutex_lock_killable(b)
1716#define ww_mutex_base_unlock(b)			mutex_unlock(b)
1717#endif
1718
1719static void ww_test_normal(void)
1720{
1721	int ret;
1722
 
 
1723	/*
1724	 * None of the ww_mutex codepaths should be taken in the 'normal'
1725	 * mutex calls. The easiest way to verify this is by using the
1726	 * normal mutex calls, and making sure o.ctx is unmodified.
1727	 */
1728
1729	/* mutex_lock (and indirectly, mutex_lock_nested) */
1730	o.ctx = (void *)~0UL;
1731	ww_mutex_base_lock(&o.base);
1732	ww_mutex_base_unlock(&o.base);
1733	WARN_ON(o.ctx != (void *)~0UL);
1734
1735	/* mutex_lock_interruptible (and *_nested) */
1736	o.ctx = (void *)~0UL;
1737	ret = ww_mutex_base_lock_interruptible(&o.base);
1738	if (!ret)
1739		ww_mutex_base_unlock(&o.base);
1740	else
1741		WARN_ON(1);
1742	WARN_ON(o.ctx != (void *)~0UL);
1743
1744	/* mutex_lock_killable (and *_nested) */
1745	o.ctx = (void *)~0UL;
1746	ret = ww_mutex_base_lock_killable(&o.base);
1747	if (!ret)
1748		ww_mutex_base_unlock(&o.base);
1749	else
1750		WARN_ON(1);
1751	WARN_ON(o.ctx != (void *)~0UL);
1752
1753	/* trylock, succeeding */
1754	o.ctx = (void *)~0UL;
1755	ret = ww_mutex_base_trylock(&o.base);
1756	WARN_ON(!ret);
1757	if (ret)
1758		ww_mutex_base_unlock(&o.base);
1759	else
1760		WARN_ON(1);
1761	WARN_ON(o.ctx != (void *)~0UL);
1762
1763	/* trylock, failing */
1764	o.ctx = (void *)~0UL;
1765	ww_mutex_base_lock(&o.base);
1766	ret = ww_mutex_base_trylock(&o.base);
1767	WARN_ON(ret);
1768	ww_mutex_base_unlock(&o.base);
1769	WARN_ON(o.ctx != (void *)~0UL);
1770
1771	WWAI(&t);
1772
1773	/* nest_lock */
1774	o.ctx = (void *)~0UL;
1775	ww_mutex_base_lock_nest_lock(&o.base, &t);
1776	ww_mutex_base_unlock(&o.base);
1777	WARN_ON(o.ctx != (void *)~0UL);
1778}
1779
1780static void ww_test_two_contexts(void)
1781{
1782	WWAI(&t);
1783	WWAI(&t2);
1784}
1785
1786static void ww_test_diff_class(void)
1787{
1788	WWAI(&t);
1789#ifdef DEBUG_WW_MUTEXES
1790	t.ww_class = NULL;
1791#endif
1792	WWL(&o, &t);
1793}
1794
1795static void ww_test_context_done_twice(void)
1796{
1797	WWAI(&t);
1798	WWAD(&t);
1799	WWAD(&t);
1800	WWAF(&t);
1801}
1802
1803static void ww_test_context_unlock_twice(void)
1804{
1805	WWAI(&t);
1806	WWAD(&t);
1807	WWAF(&t);
1808	WWAF(&t);
1809}
1810
1811static void ww_test_context_fini_early(void)
1812{
1813	WWAI(&t);
1814	WWL(&o, &t);
1815	WWAD(&t);
1816	WWAF(&t);
1817}
1818
1819static void ww_test_context_lock_after_done(void)
1820{
1821	WWAI(&t);
1822	WWAD(&t);
1823	WWL(&o, &t);
1824}
1825
1826static void ww_test_object_unlock_twice(void)
1827{
1828	WWL1(&o);
1829	WWU(&o);
1830	WWU(&o);
1831}
1832
1833static void ww_test_object_lock_unbalanced(void)
1834{
1835	WWAI(&t);
1836	WWL(&o, &t);
1837	t.acquired = 0;
1838	WWU(&o);
1839	WWAF(&t);
1840}
1841
1842static void ww_test_object_lock_stale_context(void)
1843{
1844	WWAI(&t);
1845	o.ctx = &t2;
1846	WWL(&o, &t);
1847}
1848
1849static void ww_test_edeadlk_normal(void)
1850{
1851	int ret;
1852
1853	ww_mutex_base_lock(&o2.base);
1854	o2.ctx = &t2;
1855	mutex_release(&o2.base.dep_map, _THIS_IP_);
1856
1857	WWAI(&t);
1858	t2 = t;
1859	t2.stamp--;
1860
1861	ret = WWL(&o, &t);
1862	WARN_ON(ret);
1863
1864	ret = WWL(&o2, &t);
1865	WARN_ON(ret != -EDEADLK);
1866
1867	o2.ctx = NULL;
1868	mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1869	ww_mutex_base_unlock(&o2.base);
1870	WWU(&o);
1871
1872	WWL(&o2, &t);
1873}
1874
1875static void ww_test_edeadlk_normal_slow(void)
1876{
1877	int ret;
1878
1879	ww_mutex_base_lock(&o2.base);
1880	mutex_release(&o2.base.dep_map, _THIS_IP_);
1881	o2.ctx = &t2;
1882
1883	WWAI(&t);
1884	t2 = t;
1885	t2.stamp--;
1886
1887	ret = WWL(&o, &t);
1888	WARN_ON(ret);
1889
1890	ret = WWL(&o2, &t);
1891	WARN_ON(ret != -EDEADLK);
1892
1893	o2.ctx = NULL;
1894	mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1895	ww_mutex_base_unlock(&o2.base);
1896	WWU(&o);
1897
1898	ww_mutex_lock_slow(&o2, &t);
1899}
1900
1901static void ww_test_edeadlk_no_unlock(void)
1902{
1903	int ret;
1904
1905	ww_mutex_base_lock(&o2.base);
1906	o2.ctx = &t2;
1907	mutex_release(&o2.base.dep_map, _THIS_IP_);
1908
1909	WWAI(&t);
1910	t2 = t;
1911	t2.stamp--;
1912
1913	ret = WWL(&o, &t);
1914	WARN_ON(ret);
1915
1916	ret = WWL(&o2, &t);
1917	WARN_ON(ret != -EDEADLK);
1918
1919	o2.ctx = NULL;
1920	mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1921	ww_mutex_base_unlock(&o2.base);
1922
1923	WWL(&o2, &t);
1924}
1925
1926static void ww_test_edeadlk_no_unlock_slow(void)
1927{
1928	int ret;
1929
1930	ww_mutex_base_lock(&o2.base);
1931	mutex_release(&o2.base.dep_map, _THIS_IP_);
1932	o2.ctx = &t2;
1933
1934	WWAI(&t);
1935	t2 = t;
1936	t2.stamp--;
1937
1938	ret = WWL(&o, &t);
1939	WARN_ON(ret);
1940
1941	ret = WWL(&o2, &t);
1942	WARN_ON(ret != -EDEADLK);
1943
1944	o2.ctx = NULL;
1945	mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
1946	ww_mutex_base_unlock(&o2.base);
1947
1948	ww_mutex_lock_slow(&o2, &t);
1949}
1950
1951static void ww_test_edeadlk_acquire_more(void)
1952{
1953	int ret;
1954
1955	ww_mutex_base_lock(&o2.base);
1956	mutex_release(&o2.base.dep_map, _THIS_IP_);
1957	o2.ctx = &t2;
1958
1959	WWAI(&t);
1960	t2 = t;
1961	t2.stamp--;
1962
1963	ret = WWL(&o, &t);
1964	WARN_ON(ret);
1965
1966	ret = WWL(&o2, &t);
1967	WARN_ON(ret != -EDEADLK);
1968
1969	ret = WWL(&o3, &t);
1970}
1971
1972static void ww_test_edeadlk_acquire_more_slow(void)
1973{
1974	int ret;
1975
1976	ww_mutex_base_lock(&o2.base);
1977	mutex_release(&o2.base.dep_map, _THIS_IP_);
1978	o2.ctx = &t2;
1979
1980	WWAI(&t);
1981	t2 = t;
1982	t2.stamp--;
1983
1984	ret = WWL(&o, &t);
1985	WARN_ON(ret);
1986
1987	ret = WWL(&o2, &t);
1988	WARN_ON(ret != -EDEADLK);
1989
1990	ww_mutex_lock_slow(&o3, &t);
1991}
1992
1993static void ww_test_edeadlk_acquire_more_edeadlk(void)
1994{
1995	int ret;
1996
1997	ww_mutex_base_lock(&o2.base);
1998	mutex_release(&o2.base.dep_map, _THIS_IP_);
1999	o2.ctx = &t2;
2000
2001	ww_mutex_base_lock(&o3.base);
2002	mutex_release(&o3.base.dep_map, _THIS_IP_);
2003	o3.ctx = &t2;
2004
2005	WWAI(&t);
2006	t2 = t;
2007	t2.stamp--;
2008
2009	ret = WWL(&o, &t);
2010	WARN_ON(ret);
2011
2012	ret = WWL(&o2, &t);
2013	WARN_ON(ret != -EDEADLK);
2014
2015	ret = WWL(&o3, &t);
2016	WARN_ON(ret != -EDEADLK);
2017}
2018
2019static void ww_test_edeadlk_acquire_more_edeadlk_slow(void)
2020{
2021	int ret;
2022
2023	ww_mutex_base_lock(&o2.base);
2024	mutex_release(&o2.base.dep_map, _THIS_IP_);
2025	o2.ctx = &t2;
2026
2027	ww_mutex_base_lock(&o3.base);
2028	mutex_release(&o3.base.dep_map, _THIS_IP_);
2029	o3.ctx = &t2;
2030
2031	WWAI(&t);
2032	t2 = t;
2033	t2.stamp--;
2034
2035	ret = WWL(&o, &t);
2036	WARN_ON(ret);
2037
2038	ret = WWL(&o2, &t);
2039	WARN_ON(ret != -EDEADLK);
2040
2041	ww_mutex_lock_slow(&o3, &t);
2042}
2043
2044static void ww_test_edeadlk_acquire_wrong(void)
2045{
2046	int ret;
2047
2048	ww_mutex_base_lock(&o2.base);
2049	mutex_release(&o2.base.dep_map, _THIS_IP_);
2050	o2.ctx = &t2;
2051
2052	WWAI(&t);
2053	t2 = t;
2054	t2.stamp--;
2055
2056	ret = WWL(&o, &t);
2057	WARN_ON(ret);
2058
2059	ret = WWL(&o2, &t);
2060	WARN_ON(ret != -EDEADLK);
2061	if (!ret)
2062		WWU(&o2);
2063
2064	WWU(&o);
2065
2066	ret = WWL(&o3, &t);
2067}
2068
2069static void ww_test_edeadlk_acquire_wrong_slow(void)
2070{
2071	int ret;
2072
2073	ww_mutex_base_lock(&o2.base);
2074	mutex_release(&o2.base.dep_map, _THIS_IP_);
2075	o2.ctx = &t2;
2076
2077	WWAI(&t);
2078	t2 = t;
2079	t2.stamp--;
2080
2081	ret = WWL(&o, &t);
2082	WARN_ON(ret);
2083
2084	ret = WWL(&o2, &t);
2085	WARN_ON(ret != -EDEADLK);
2086	if (!ret)
2087		WWU(&o2);
2088
2089	WWU(&o);
2090
2091	ww_mutex_lock_slow(&o3, &t);
2092}
2093
2094static void ww_test_spin_nest_unlocked(void)
2095{
2096	spin_lock_nest_lock(&lock_A, &o.base);
2097	U(A);
2098}
2099
2100/* This is not a deadlock, because we have X1 to serialize Y1 and Y2 */
2101static void ww_test_spin_nest_lock(void)
2102{
2103	spin_lock(&lock_X1);
2104	spin_lock_nest_lock(&lock_Y1, &lock_X1);
2105	spin_lock(&lock_A);
2106	spin_lock_nest_lock(&lock_Y2, &lock_X1);
2107	spin_unlock(&lock_A);
2108	spin_unlock(&lock_Y2);
2109	spin_unlock(&lock_Y1);
2110	spin_unlock(&lock_X1);
2111}
2112
2113static void ww_test_unneeded_slow(void)
2114{
2115	WWAI(&t);
2116
2117	ww_mutex_lock_slow(&o, &t);
2118}
2119
2120static void ww_test_context_block(void)
2121{
2122	int ret;
2123
2124	WWAI(&t);
2125
2126	ret = WWL(&o, &t);
2127	WARN_ON(ret);
2128	WWL1(&o2);
2129}
2130
2131static void ww_test_context_try(void)
2132{
2133	int ret;
2134
2135	WWAI(&t);
2136
2137	ret = WWL(&o, &t);
2138	WARN_ON(ret);
2139
2140	ret = WWT(&o2);
2141	WARN_ON(!ret);
2142	WWU(&o2);
2143	WWU(&o);
2144}
2145
2146static void ww_test_context_context(void)
2147{
2148	int ret;
2149
2150	WWAI(&t);
2151
2152	ret = WWL(&o, &t);
2153	WARN_ON(ret);
2154
2155	ret = WWL(&o2, &t);
2156	WARN_ON(ret);
2157
2158	WWU(&o2);
2159	WWU(&o);
2160}
2161
2162static void ww_test_try_block(void)
2163{
2164	bool ret;
2165
2166	ret = WWT(&o);
2167	WARN_ON(!ret);
2168
2169	WWL1(&o2);
2170	WWU(&o2);
2171	WWU(&o);
2172}
2173
2174static void ww_test_try_try(void)
2175{
2176	bool ret;
2177
2178	ret = WWT(&o);
2179	WARN_ON(!ret);
2180	ret = WWT(&o2);
2181	WARN_ON(!ret);
2182	WWU(&o2);
2183	WWU(&o);
2184}
2185
2186static void ww_test_try_context(void)
2187{
2188	int ret;
2189
2190	ret = WWT(&o);
2191	WARN_ON(!ret);
2192
2193	WWAI(&t);
2194
2195	ret = WWL(&o2, &t);
2196	WARN_ON(ret);
2197}
2198
2199static void ww_test_block_block(void)
2200{
2201	WWL1(&o);
2202	WWL1(&o2);
2203}
2204
2205static void ww_test_block_try(void)
2206{
2207	bool ret;
2208
2209	WWL1(&o);
2210	ret = WWT(&o2);
2211	WARN_ON(!ret);
2212}
2213
2214static void ww_test_block_context(void)
2215{
2216	int ret;
2217
2218	WWL1(&o);
2219	WWAI(&t);
2220
2221	ret = WWL(&o2, &t);
2222	WARN_ON(ret);
2223}
2224
2225static void ww_test_spin_block(void)
2226{
2227	L(A);
2228	U(A);
2229
2230	WWL1(&o);
2231	L(A);
2232	U(A);
2233	WWU(&o);
2234
2235	L(A);
2236	WWL1(&o);
2237	WWU(&o);
2238	U(A);
2239}
2240
2241static void ww_test_spin_try(void)
2242{
2243	bool ret;
2244
2245	L(A);
2246	U(A);
2247
2248	ret = WWT(&o);
2249	WARN_ON(!ret);
2250	L(A);
2251	U(A);
2252	WWU(&o);
2253
2254	L(A);
2255	ret = WWT(&o);
2256	WARN_ON(!ret);
2257	WWU(&o);
2258	U(A);
2259}
2260
2261static void ww_test_spin_context(void)
2262{
2263	int ret;
2264
2265	L(A);
2266	U(A);
2267
2268	WWAI(&t);
2269
2270	ret = WWL(&o, &t);
2271	WARN_ON(ret);
2272	L(A);
2273	U(A);
2274	WWU(&o);
2275
2276	L(A);
2277	ret = WWL(&o, &t);
2278	WARN_ON(ret);
2279	WWU(&o);
2280	U(A);
2281}
2282
2283static void ww_tests(void)
2284{
2285	printk("  --------------------------------------------------------------------------\n");
2286	printk("  | Wound/wait tests |\n");
2287	printk("  ---------------------\n");
2288
2289	print_testname("ww api failures");
2290	dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW);
2291	dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW);
2292	dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW);
2293	pr_cont("\n");
2294
2295	print_testname("ww contexts mixing");
2296	dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW);
2297	dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW);
2298	pr_cont("\n");
2299
2300	print_testname("finishing ww context");
2301	dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW);
2302	dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW);
2303	dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW);
2304	dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW);
2305	pr_cont("\n");
2306
2307	print_testname("locking mismatches");
2308	dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW);
2309	dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW);
2310	dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW);
2311	pr_cont("\n");
2312
2313	print_testname("EDEADLK handling");
2314	dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW);
2315	dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW);
2316	dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW);
2317	dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW);
2318	dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW);
2319	dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW);
2320	dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW);
2321	dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW);
2322	dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW);
2323	dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW);
2324	pr_cont("\n");
2325
2326	print_testname("spinlock nest unlocked");
2327	dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW);
2328	pr_cont("\n");
2329
2330	print_testname("spinlock nest test");
2331	dotest(ww_test_spin_nest_lock, SUCCESS, LOCKTYPE_WW);
2332	pr_cont("\n");
2333
2334	printk("  -----------------------------------------------------\n");
2335	printk("                                 |block | try  |context|\n");
2336	printk("  -----------------------------------------------------\n");
2337
2338	print_testname("context");
2339	dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW);
2340	dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW);
2341	dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW);
2342	pr_cont("\n");
2343
2344	print_testname("try");
2345	dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW);
2346	dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW);
2347	dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW);
2348	pr_cont("\n");
2349
2350	print_testname("block");
2351	dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW);
2352	dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW);
2353	dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW);
2354	pr_cont("\n");
2355
2356	print_testname("spinlock");
2357	dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW);
2358	dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW);
2359	dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW);
2360	pr_cont("\n");
2361}
2362
2363
2364/*
2365 * <in hardirq handler>
2366 * read_lock(&A);
2367 *			<hardirq disable>
2368 *			spin_lock(&B);
2369 * spin_lock(&B);
2370 *			read_lock(&A);
2371 *
2372 * is a deadlock.
2373 */
2374static void queued_read_lock_hardirq_RE_Er(void)
2375{
2376	HARDIRQ_ENTER();
2377	read_lock(&rwlock_A);
2378	LOCK(B);
2379	UNLOCK(B);
2380	read_unlock(&rwlock_A);
2381	HARDIRQ_EXIT();
2382
2383	HARDIRQ_DISABLE();
2384	LOCK(B);
2385	read_lock(&rwlock_A);
2386	read_unlock(&rwlock_A);
2387	UNLOCK(B);
2388	HARDIRQ_ENABLE();
2389}
2390
2391/*
2392 * <in hardirq handler>
2393 * spin_lock(&B);
2394 *			<hardirq disable>
2395 *			read_lock(&A);
2396 * read_lock(&A);
2397 *			spin_lock(&B);
2398 *
2399 * is not a deadlock.
2400 */
2401static void queued_read_lock_hardirq_ER_rE(void)
2402{
2403	HARDIRQ_ENTER();
2404	LOCK(B);
2405	read_lock(&rwlock_A);
2406	read_unlock(&rwlock_A);
2407	UNLOCK(B);
2408	HARDIRQ_EXIT();
2409
2410	HARDIRQ_DISABLE();
2411	read_lock(&rwlock_A);
2412	LOCK(B);
2413	UNLOCK(B);
2414	read_unlock(&rwlock_A);
2415	HARDIRQ_ENABLE();
2416}
2417
2418/*
2419 * <hardirq disable>
2420 * spin_lock(&B);
2421 *			read_lock(&A);
2422 *			<in hardirq handler>
2423 *			spin_lock(&B);
2424 * read_lock(&A);
2425 *
2426 * is a deadlock. Because the two read_lock()s are both non-recursive readers.
2427 */
2428static void queued_read_lock_hardirq_inversion(void)
2429{
2430
2431	HARDIRQ_ENTER();
2432	LOCK(B);
2433	UNLOCK(B);
2434	HARDIRQ_EXIT();
2435
2436	HARDIRQ_DISABLE();
2437	LOCK(B);
2438	read_lock(&rwlock_A);
2439	read_unlock(&rwlock_A);
2440	UNLOCK(B);
2441	HARDIRQ_ENABLE();
2442
2443	read_lock(&rwlock_A);
2444	read_unlock(&rwlock_A);
2445}
2446
2447static void queued_read_lock_tests(void)
2448{
2449	printk("  --------------------------------------------------------------------------\n");
2450	printk("  | queued read lock tests |\n");
2451	printk("  ---------------------------\n");
2452	print_testname("hardirq read-lock/lock-read");
2453	dotest(queued_read_lock_hardirq_RE_Er, FAILURE, LOCKTYPE_RWLOCK);
2454	pr_cont("\n");
2455
2456	print_testname("hardirq lock-read/read-lock");
2457	dotest(queued_read_lock_hardirq_ER_rE, SUCCESS, LOCKTYPE_RWLOCK);
2458	pr_cont("\n");
2459
2460	print_testname("hardirq inversion");
2461	dotest(queued_read_lock_hardirq_inversion, FAILURE, LOCKTYPE_RWLOCK);
2462	pr_cont("\n");
2463}
2464
2465static void fs_reclaim_correct_nesting(void)
2466{
2467	fs_reclaim_acquire(GFP_KERNEL);
2468	might_alloc(GFP_NOFS);
2469	fs_reclaim_release(GFP_KERNEL);
2470}
2471
2472static void fs_reclaim_wrong_nesting(void)
2473{
2474	fs_reclaim_acquire(GFP_KERNEL);
2475	might_alloc(GFP_KERNEL);
2476	fs_reclaim_release(GFP_KERNEL);
2477}
2478
2479static void fs_reclaim_protected_nesting(void)
2480{
2481	unsigned int flags;
2482
2483	fs_reclaim_acquire(GFP_KERNEL);
2484	flags = memalloc_nofs_save();
2485	might_alloc(GFP_KERNEL);
2486	memalloc_nofs_restore(flags);
2487	fs_reclaim_release(GFP_KERNEL);
2488}
2489
2490static void fs_reclaim_tests(void)
2491{
2492	printk("  --------------------\n");
2493	printk("  | fs_reclaim tests |\n");
2494	printk("  --------------------\n");
2495
2496	print_testname("correct nesting");
2497	dotest(fs_reclaim_correct_nesting, SUCCESS, 0);
2498	pr_cont("\n");
2499
2500	print_testname("wrong nesting");
2501	dotest(fs_reclaim_wrong_nesting, FAILURE, 0);
2502	pr_cont("\n");
2503
2504	print_testname("protected nesting");
2505	dotest(fs_reclaim_protected_nesting, SUCCESS, 0);
2506	pr_cont("\n");
2507}
2508
2509/* Defines guard classes to create contexts */
2510DEFINE_LOCK_GUARD_0(HARDIRQ, HARDIRQ_ENTER(), HARDIRQ_EXIT())
2511DEFINE_LOCK_GUARD_0(NOTTHREADED_HARDIRQ,
2512	do {
2513		local_irq_disable();
2514		__irq_enter();
2515		WARN_ON(!in_irq());
2516	} while(0), HARDIRQ_EXIT())
2517DEFINE_LOCK_GUARD_0(SOFTIRQ, SOFTIRQ_ENTER(), SOFTIRQ_EXIT())
2518
2519/* Define RCU guards, should go away when RCU has its own guard definitions */
2520DEFINE_LOCK_GUARD_0(RCU, rcu_read_lock(), rcu_read_unlock())
2521DEFINE_LOCK_GUARD_0(RCU_BH, rcu_read_lock_bh(), rcu_read_unlock_bh())
2522DEFINE_LOCK_GUARD_0(RCU_SCHED, rcu_read_lock_sched(), rcu_read_unlock_sched())
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2523
 
 
 
2524
2525#define GENERATE_2_CONTEXT_TESTCASE(outer, outer_lock, inner, inner_lock)	\
2526										\
2527static void __maybe_unused inner##_in_##outer(void)				\
2528{										\
2529	/* Relies the reversed clean-up ordering: inner first */		\
2530	guard(outer)(outer_lock);						\
2531	guard(inner)(inner_lock);						\
 
2532}
2533
2534/*
2535 * wait contexts (considering PREEMPT_RT)
2536 *
2537 * o: inner is allowed in outer
2538 * x: inner is disallowed in outer
2539 *
2540 *       \  inner |  RCU  | RAW_SPIN | SPIN | MUTEX
2541 * outer  \       |       |          |      |
2542 * ---------------+-------+----------+------+-------
2543 * HARDIRQ        |   o   |    o     |  o   |  x
2544 * ---------------+-------+----------+------+-------
2545 * NOTTHREADED_IRQ|   o   |    o     |  x   |  x
2546 * ---------------+-------+----------+------+-------
2547 * SOFTIRQ        |   o   |    o     |  o   |  x
2548 * ---------------+-------+----------+------+-------
2549 * RCU            |   o   |    o     |  o   |  x
2550 * ---------------+-------+----------+------+-------
2551 * RCU_BH         |   o   |    o     |  o   |  x
2552 * ---------------+-------+----------+------+-------
2553 * RCU_SCHED      |   o   |    o     |  x   |  x
2554 * ---------------+-------+----------+------+-------
2555 * RAW_SPIN       |   o   |    o     |  x   |  x
2556 * ---------------+-------+----------+------+-------
2557 * SPIN           |   o   |    o     |  o   |  x
2558 * ---------------+-------+----------+------+-------
2559 * MUTEX          |   o   |    o     |  o   |  o
2560 * ---------------+-------+----------+------+-------
2561 */
2562
2563#define GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(inner, inner_lock)		\
2564GENERATE_2_CONTEXT_TESTCASE(HARDIRQ, , inner, inner_lock)			\
2565GENERATE_2_CONTEXT_TESTCASE(NOTTHREADED_HARDIRQ, , inner, inner_lock)		\
2566GENERATE_2_CONTEXT_TESTCASE(SOFTIRQ, , inner, inner_lock)			\
2567GENERATE_2_CONTEXT_TESTCASE(RCU, , inner, inner_lock)				\
2568GENERATE_2_CONTEXT_TESTCASE(RCU_BH, , inner, inner_lock)			\
2569GENERATE_2_CONTEXT_TESTCASE(RCU_SCHED, , inner, inner_lock)			\
2570GENERATE_2_CONTEXT_TESTCASE(raw_spinlock, &raw_lock_A, inner, inner_lock)	\
2571GENERATE_2_CONTEXT_TESTCASE(spinlock, &lock_A, inner, inner_lock)		\
2572GENERATE_2_CONTEXT_TESTCASE(mutex, &mutex_A, inner, inner_lock)
2573
2574GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RCU, )
2575GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(raw_spinlock, &raw_lock_B)
2576GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(spinlock, &lock_B)
2577GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(mutex, &mutex_B)
2578
2579/* the outer context allows all kinds of preemption */
2580#define DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(outer)			\
2581	dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK);		\
2582	dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN);	\
2583	dotest(spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN);		\
2584	dotest(mutex_in_##outer, SUCCESS, LOCKTYPE_MUTEX);		\
2585
2586/*
2587 * the outer context only allows the preemption introduced by spinlock_t (which
2588 * is a sleepable lock for PREEMPT_RT)
2589 */
2590#define DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(outer)		\
2591	dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK);		\
2592	dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN);	\
2593	dotest(spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN);		\
2594	dotest(mutex_in_##outer, FAILURE, LOCKTYPE_MUTEX);		\
2595
2596/* the outer doesn't allows any kind of preemption */
2597#define DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(outer)			\
2598	dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK);		\
2599	dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN);	\
2600	dotest(spinlock_in_##outer, FAILURE, LOCKTYPE_SPIN);		\
2601	dotest(mutex_in_##outer, FAILURE, LOCKTYPE_MUTEX);		\
2602
2603static void wait_context_tests(void)
2604{
2605	printk("  --------------------------------------------------------------------------\n");
2606	printk("  | wait context tests |\n");
2607	printk("  --------------------------------------------------------------------------\n");
2608	printk("                                 | rcu  | raw  | spin |mutex |\n");
2609	printk("  --------------------------------------------------------------------------\n");
2610	print_testname("in hardirq context");
2611	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(HARDIRQ);
2612	pr_cont("\n");
2613
2614	print_testname("in hardirq context (not threaded)");
2615	DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(NOTTHREADED_HARDIRQ);
2616	pr_cont("\n");
2617
2618	print_testname("in softirq context");
2619	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SOFTIRQ);
2620	pr_cont("\n");
2621
2622	print_testname("in RCU context");
2623	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU);
2624	pr_cont("\n");
2625
2626	print_testname("in RCU-bh context");
2627	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU_BH);
2628	pr_cont("\n");
2629
2630	print_testname("in RCU-sched context");
2631	DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RCU_SCHED);
2632	pr_cont("\n");
2633
2634	print_testname("in RAW_SPINLOCK context");
2635	DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(raw_spinlock);
2636	pr_cont("\n");
2637
2638	print_testname("in SPINLOCK context");
2639	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(spinlock);
2640	pr_cont("\n");
2641
2642	print_testname("in MUTEX context");
2643	DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(mutex);
2644	pr_cont("\n");
2645}
2646
2647static void local_lock_2(void)
2648{
2649	local_lock(&local_A);	/* IRQ-ON */
2650	local_unlock(&local_A);
2651
2652	HARDIRQ_ENTER();
2653	spin_lock(&lock_A);		/* IN-IRQ */
2654	spin_unlock(&lock_A);
2655	HARDIRQ_EXIT()
2656
2657	HARDIRQ_DISABLE();
2658	spin_lock(&lock_A);
2659	local_lock(&local_A);	/* IN-IRQ <-> IRQ-ON cycle, false */
2660	local_unlock(&local_A);
2661	spin_unlock(&lock_A);
2662	HARDIRQ_ENABLE();
2663}
2664
2665static void local_lock_3A(void)
2666{
2667	local_lock(&local_A);	/* IRQ-ON */
2668	spin_lock(&lock_B);		/* IRQ-ON */
2669	spin_unlock(&lock_B);
2670	local_unlock(&local_A);
2671
2672	HARDIRQ_ENTER();
2673	spin_lock(&lock_A);		/* IN-IRQ */
2674	spin_unlock(&lock_A);
2675	HARDIRQ_EXIT()
2676
2677	HARDIRQ_DISABLE();
2678	spin_lock(&lock_A);
2679	local_lock(&local_A);	/* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
2680	local_unlock(&local_A);
2681	spin_unlock(&lock_A);
2682	HARDIRQ_ENABLE();
2683}
2684
2685static void local_lock_3B(void)
2686{
2687	local_lock(&local_A);	/* IRQ-ON */
2688	spin_lock(&lock_B);		/* IRQ-ON */
2689	spin_unlock(&lock_B);
2690	local_unlock(&local_A);
2691
2692	HARDIRQ_ENTER();
2693	spin_lock(&lock_A);		/* IN-IRQ */
2694	spin_unlock(&lock_A);
2695	HARDIRQ_EXIT()
2696
2697	HARDIRQ_DISABLE();
2698	spin_lock(&lock_A);
2699	local_lock(&local_A);	/* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
2700	local_unlock(&local_A);
2701	spin_unlock(&lock_A);
2702	HARDIRQ_ENABLE();
2703
2704	HARDIRQ_DISABLE();
2705	spin_lock(&lock_A);
2706	spin_lock(&lock_B);		/* IN-IRQ <-> IRQ-ON cycle, true */
2707	spin_unlock(&lock_B);
2708	spin_unlock(&lock_A);
2709	HARDIRQ_DISABLE();
2710
2711}
2712
2713#ifdef CONFIG_DEBUG_LOCK_ALLOC
2714static inline const char *rw_semaphore_lockdep_name(struct rw_semaphore *rwsem)
2715{
2716	return rwsem->dep_map.name;
2717}
2718#else
2719static inline const char *rw_semaphore_lockdep_name(struct rw_semaphore *rwsem)
2720{
2721	return NULL;
2722}
2723#endif
2724
2725static void test_lockdep_set_subclass_name(void)
2726{
2727	const char *name_before = rw_semaphore_lockdep_name(&rwsem_X1);
2728	const char *name_after;
2729
2730	lockdep_set_subclass(&rwsem_X1, 1);
2731	name_after = rw_semaphore_lockdep_name(&rwsem_X1);
2732	DEBUG_LOCKS_WARN_ON(name_before != name_after);
2733}
2734
2735/*
2736 * lockdep_set_subclass() should reuse the existing lock class name instead
2737 * of creating a new one.
2738 */
2739static void lockdep_set_subclass_name_test(void)
2740{
2741	printk("  --------------------------------------------------------------------------\n");
2742	printk("  | lockdep_set_subclass() name test|\n");
2743	printk("  -----------------------------------\n");
2744
2745	print_testname("compare name before and after");
2746	dotest(test_lockdep_set_subclass_name, SUCCESS, LOCKTYPE_RWSEM);
2747	pr_cont("\n");
2748}
2749
2750static void local_lock_tests(void)
2751{
2752	printk("  --------------------------------------------------------------------------\n");
2753	printk("  | local_lock tests |\n");
2754	printk("  ---------------------\n");
2755
2756	print_testname("local_lock inversion  2");
2757	dotest(local_lock_2, SUCCESS, LOCKTYPE_LL);
2758	pr_cont("\n");
2759
2760	print_testname("local_lock inversion 3A");
2761	dotest(local_lock_3A, SUCCESS, LOCKTYPE_LL);
2762	pr_cont("\n");
2763
2764	print_testname("local_lock inversion 3B");
2765	dotest(local_lock_3B, FAILURE, LOCKTYPE_LL);
2766	pr_cont("\n");
2767}
2768
2769static void hardirq_deadlock_softirq_not_deadlock(void)
2770{
2771	/* mutex_A is hardirq-unsafe and softirq-unsafe */
2772	/* mutex_A -> lock_C */
2773	mutex_lock(&mutex_A);
2774	HARDIRQ_DISABLE();
2775	spin_lock(&lock_C);
2776	spin_unlock(&lock_C);
2777	HARDIRQ_ENABLE();
2778	mutex_unlock(&mutex_A);
2779
2780	/* lock_A is hardirq-safe */
2781	HARDIRQ_ENTER();
2782	spin_lock(&lock_A);
2783	spin_unlock(&lock_A);
2784	HARDIRQ_EXIT();
2785
2786	/* lock_A -> lock_B */
2787	HARDIRQ_DISABLE();
2788	spin_lock(&lock_A);
2789	spin_lock(&lock_B);
2790	spin_unlock(&lock_B);
2791	spin_unlock(&lock_A);
2792	HARDIRQ_ENABLE();
2793
2794	/* lock_B -> lock_C */
2795	HARDIRQ_DISABLE();
2796	spin_lock(&lock_B);
2797	spin_lock(&lock_C);
2798	spin_unlock(&lock_C);
2799	spin_unlock(&lock_B);
2800	HARDIRQ_ENABLE();
2801
2802	/* lock_D is softirq-safe */
2803	SOFTIRQ_ENTER();
2804	spin_lock(&lock_D);
2805	spin_unlock(&lock_D);
2806	SOFTIRQ_EXIT();
2807
2808	/* And lock_D is hardirq-unsafe */
2809	SOFTIRQ_DISABLE();
2810	spin_lock(&lock_D);
2811	spin_unlock(&lock_D);
2812	SOFTIRQ_ENABLE();
2813
2814	/*
2815	 * mutex_A -> lock_C -> lock_D is softirq-unsafe -> softirq-safe, not
2816	 * deadlock.
2817	 *
2818	 * lock_A -> lock_B -> lock_C -> lock_D is hardirq-safe ->
2819	 * hardirq-unsafe, deadlock.
2820	 */
2821	HARDIRQ_DISABLE();
2822	spin_lock(&lock_C);
2823	spin_lock(&lock_D);
2824	spin_unlock(&lock_D);
2825	spin_unlock(&lock_C);
2826	HARDIRQ_ENABLE();
2827}
2828
2829void locking_selftest(void)
2830{
2831	/*
2832	 * Got a locking failure before the selftest ran?
2833	 */
2834	if (!debug_locks) {
2835		printk("----------------------------------\n");
2836		printk("| Locking API testsuite disabled |\n");
2837		printk("----------------------------------\n");
2838		return;
2839	}
2840
2841	/*
2842	 * treats read_lock() as recursive read locks for testing purpose
2843	 */
2844	force_read_lock_recursive = 1;
2845
2846	/*
2847	 * Run the testsuite:
2848	 */
2849	printk("------------------------\n");
2850	printk("| Locking API testsuite:\n");
2851	printk("----------------------------------------------------------------------------\n");
2852	printk("                                 | spin |wlock |rlock |mutex | wsem | rsem |rtmutex\n");
2853	printk("  --------------------------------------------------------------------------\n");
2854
2855	init_shared_classes();
2856	lockdep_set_selftest_task(current);
2857
2858	DO_TESTCASE_6R("A-A deadlock", AA);
2859	DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
2860	DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA);
2861	DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC);
2862	DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA);
2863	DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA);
2864	DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA);
2865	DO_TESTCASE_6("double unlock", double_unlock);
2866	DO_TESTCASE_6("initialize held", init_held);
2867
2868	printk("  --------------------------------------------------------------------------\n");
2869	print_testname("recursive read-lock");
2870	pr_cont("             |");
2871	dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
2872	pr_cont("             |");
2873	dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
2874	pr_cont("\n");
2875
2876	print_testname("recursive read-lock #2");
2877	pr_cont("             |");
2878	dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK);
2879	pr_cont("             |");
2880	dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
2881	pr_cont("\n");
2882
2883	print_testname("mixed read-write-lock");
2884	pr_cont("             |");
2885	dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK);
2886	pr_cont("             |");
2887	dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM);
2888	pr_cont("\n");
2889
2890	print_testname("mixed write-read-lock");
2891	pr_cont("             |");
2892	dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK);
2893	pr_cont("             |");
2894	dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
2895	pr_cont("\n");
2896
2897	print_testname("mixed read-lock/lock-write ABBA");
2898	pr_cont("             |");
2899	dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
2900	pr_cont("             |");
2901	dotest(rwsem_ABBA1, FAILURE, LOCKTYPE_RWSEM);
2902
2903	print_testname("mixed read-lock/lock-read ABBA");
2904	pr_cont("             |");
2905	dotest(rlock_ABBA2, SUCCESS, LOCKTYPE_RWLOCK);
2906	pr_cont("             |");
2907	dotest(rwsem_ABBA2, FAILURE, LOCKTYPE_RWSEM);
2908
2909	print_testname("mixed write-lock/lock-write ABBA");
2910	pr_cont("             |");
2911	dotest(rlock_ABBA3, FAILURE, LOCKTYPE_RWLOCK);
2912	pr_cont("             |");
2913	dotest(rwsem_ABBA3, FAILURE, LOCKTYPE_RWSEM);
2914
2915	print_testname("chain cached mixed R-L/L-W ABBA");
2916	pr_cont("             |");
2917	dotest(rlock_chaincache_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
2918
2919	DO_TESTCASE_6x1RRB("rlock W1R2/W2R3/W3R1", W1R2_W2R3_W3R1);
2920	DO_TESTCASE_6x1RRB("rlock W1W2/R2R3/W3R1", W1W2_R2R3_W3R1);
2921	DO_TESTCASE_6x1RR("rlock W1W2/R2R3/R3W1", W1W2_R2R3_R3W1);
2922	DO_TESTCASE_6x1RR("rlock W1R2/R2R3/W3W1", W1R2_R2R3_W3W1);
2923
2924	printk("  --------------------------------------------------------------------------\n");
 
2925	/*
2926	 * irq-context testcases:
2927	 */
2928	DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1);
2929	NON_RT(DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A));
2930	DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B);
2931	DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3);
2932	DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4);
2933	DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion);
2934
2935	DO_TESTCASE_6x2x2RW("irq read-recursion", irq_read_recursion);
2936	DO_TESTCASE_6x2x2RW("irq read-recursion #2", irq_read_recursion2);
2937	DO_TESTCASE_6x2x2RW("irq read-recursion #3", irq_read_recursion3);
2938
2939	ww_tests();
2940
2941	force_read_lock_recursive = 0;
2942	/*
2943	 * queued_read_lock() specific test cases can be put here
2944	 */
2945	if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS))
2946		queued_read_lock_tests();
2947
2948	fs_reclaim_tests();
2949
2950	/* Wait context test cases that are specific for RAW_LOCK_NESTING */
2951	if (IS_ENABLED(CONFIG_PROVE_RAW_LOCK_NESTING))
2952		wait_context_tests();
2953
2954	local_lock_tests();
2955
2956	print_testname("hardirq_unsafe_softirq_safe");
2957	dotest(hardirq_deadlock_softirq_not_deadlock, FAILURE, LOCKTYPE_SPECIAL);
2958	pr_cont("\n");
2959
2960	lockdep_set_subclass_name_test();
2961
2962	if (unexpected_testcase_failures) {
2963		printk("-----------------------------------------------------------------\n");
2964		debug_locks = 0;
2965		printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
2966			unexpected_testcase_failures, testcase_total);
2967		printk("-----------------------------------------------------------------\n");
2968	} else if (expected_testcase_failures && testcase_successes) {
2969		printk("--------------------------------------------------------\n");
2970		printk("%3d out of %3d testcases failed, as expected. |\n",
2971			expected_testcase_failures, testcase_total);
2972		printk("----------------------------------------------------\n");
2973		debug_locks = 1;
2974	} else if (expected_testcase_failures && !testcase_successes) {
2975		printk("--------------------------------------------------------\n");
2976		printk("All %3d testcases failed, as expected. |\n",
2977			expected_testcase_failures);
2978		printk("----------------------------------------\n");
2979		debug_locks = 1;
2980	} else {
2981		printk("-------------------------------------------------------\n");
2982		printk("Good, all %3d testcases passed! |\n",
2983			testcase_successes);
2984		printk("---------------------------------\n");
2985		debug_locks = 1;
2986	}
2987	lockdep_set_selftest_task(NULL);
2988	debug_locks_silent = 0;
2989}