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}