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 WWAI(&t); 1724 1725 /* 1726 * None of the ww_mutex codepaths should be taken in the 'normal' 1727 * mutex calls. The easiest way to verify this is by using the 1728 * normal mutex calls, and making sure o.ctx is unmodified. 1729 */ 1730 1731 /* mutex_lock (and indirectly, mutex_lock_nested) */ 1732 o.ctx = (void *)~0UL; 1733 ww_mutex_base_lock(&o.base); 1734 ww_mutex_base_unlock(&o.base); 1735 WARN_ON(o.ctx != (void *)~0UL); 1736 1737 /* mutex_lock_interruptible (and *_nested) */ 1738 o.ctx = (void *)~0UL; 1739 ret = ww_mutex_base_lock_interruptible(&o.base); 1740 if (!ret) 1741 ww_mutex_base_unlock(&o.base); 1742 else 1743 WARN_ON(1); 1744 WARN_ON(o.ctx != (void *)~0UL); 1745 1746 /* mutex_lock_killable (and *_nested) */ 1747 o.ctx = (void *)~0UL; 1748 ret = ww_mutex_base_lock_killable(&o.base); 1749 if (!ret) 1750 ww_mutex_base_unlock(&o.base); 1751 else 1752 WARN_ON(1); 1753 WARN_ON(o.ctx != (void *)~0UL); 1754 1755 /* trylock, succeeding */ 1756 o.ctx = (void *)~0UL; 1757 ret = ww_mutex_base_trylock(&o.base); 1758 WARN_ON(!ret); 1759 if (ret) 1760 ww_mutex_base_unlock(&o.base); 1761 else 1762 WARN_ON(1); 1763 WARN_ON(o.ctx != (void *)~0UL); 1764 1765 /* trylock, failing */ 1766 o.ctx = (void *)~0UL; 1767 ww_mutex_base_lock(&o.base); 1768 ret = ww_mutex_base_trylock(&o.base); 1769 WARN_ON(ret); 1770 ww_mutex_base_unlock(&o.base); 1771 WARN_ON(o.ctx != (void *)~0UL); 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 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 |rtmutex\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 * irq-context testcases: 2890 */ 2891 DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1); 2892 NON_RT(DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A)); 2893 DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B); 2894 DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3); 2895 DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4); 2896 DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion); 2897 2898 DO_TESTCASE_6x2x2RW("irq read-recursion", irq_read_recursion); 2899 DO_TESTCASE_6x2x2RW("irq read-recursion #2", irq_read_recursion2); 2900 DO_TESTCASE_6x2x2RW("irq read-recursion #3", irq_read_recursion3); 2901 2902 ww_tests(); 2903 2904 force_read_lock_recursive = 0; 2905 /* 2906 * queued_read_lock() specific test cases can be put here 2907 */ 2908 if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS)) 2909 queued_read_lock_tests(); 2910 2911 fs_reclaim_tests(); 2912 2913 /* Wait context test cases that are specific for RAW_LOCK_NESTING */ 2914 if (IS_ENABLED(CONFIG_PROVE_RAW_LOCK_NESTING)) 2915 wait_context_tests(); 2916 2917 local_lock_tests(); 2918 2919 print_testname("hardirq_unsafe_softirq_safe"); 2920 dotest(hardirq_deadlock_softirq_not_deadlock, FAILURE, LOCKTYPE_SPECIAL); 2921 pr_cont("\n"); 2922 2923 if (unexpected_testcase_failures) { 2924 printk("-----------------------------------------------------------------\n"); 2925 debug_locks = 0; 2926 printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n", 2927 unexpected_testcase_failures, testcase_total); 2928 printk("-----------------------------------------------------------------\n"); 2929 } else if (expected_testcase_failures && testcase_successes) { 2930 printk("--------------------------------------------------------\n"); 2931 printk("%3d out of %3d testcases failed, as expected. |\n", 2932 expected_testcase_failures, testcase_total); 2933 printk("----------------------------------------------------\n"); 2934 debug_locks = 1; 2935 } else if (expected_testcase_failures && !testcase_successes) { 2936 printk("--------------------------------------------------------\n"); 2937 printk("All %3d testcases failed, as expected. |\n", 2938 expected_testcase_failures); 2939 printk("----------------------------------------\n"); 2940 debug_locks = 1; 2941 } else { 2942 printk("-------------------------------------------------------\n"); 2943 printk("Good, all %3d testcases passed! |\n", 2944 testcase_successes); 2945 printk("---------------------------------\n"); 2946 debug_locks = 1; 2947 } 2948 lockdep_set_selftest_task(NULL); 2949 debug_locks_silent = 0; 2950} 2951