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 */ 38 static unsigned int debug_locks_verbose; 39 unsigned int force_read_lock_recursive; 40 41 static DEFINE_WD_CLASS(ww_lockdep); 42 43 static 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 64 static struct ww_acquire_ctx t, t2; 65 static struct ww_mutex o, o2, o3; 66 67 /* 68 * Normal standalone locks, for the circular and irq-context 69 * dependency tests: 70 */ 71 static DEFINE_SPINLOCK(lock_A); 72 static DEFINE_SPINLOCK(lock_B); 73 static DEFINE_SPINLOCK(lock_C); 74 static DEFINE_SPINLOCK(lock_D); 75 76 static DEFINE_RAW_SPINLOCK(raw_lock_A); 77 static DEFINE_RAW_SPINLOCK(raw_lock_B); 78 79 static DEFINE_RWLOCK(rwlock_A); 80 static DEFINE_RWLOCK(rwlock_B); 81 static DEFINE_RWLOCK(rwlock_C); 82 static DEFINE_RWLOCK(rwlock_D); 83 84 static DEFINE_MUTEX(mutex_A); 85 static DEFINE_MUTEX(mutex_B); 86 static DEFINE_MUTEX(mutex_C); 87 static DEFINE_MUTEX(mutex_D); 88 89 static DECLARE_RWSEM(rwsem_A); 90 static DECLARE_RWSEM(rwsem_B); 91 static DECLARE_RWSEM(rwsem_C); 92 static DECLARE_RWSEM(rwsem_D); 93 94 #ifdef CONFIG_RT_MUTEXES 95 96 static DEFINE_RT_MUTEX(rtmutex_A); 97 static DEFINE_RT_MUTEX(rtmutex_B); 98 static DEFINE_RT_MUTEX(rtmutex_C); 99 static 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 */ 109 static DEFINE_SPINLOCK(lock_X1); 110 static DEFINE_SPINLOCK(lock_X2); 111 static DEFINE_SPINLOCK(lock_Y1); 112 static DEFINE_SPINLOCK(lock_Y2); 113 static DEFINE_SPINLOCK(lock_Z1); 114 static DEFINE_SPINLOCK(lock_Z2); 115 116 static DEFINE_RWLOCK(rwlock_X1); 117 static DEFINE_RWLOCK(rwlock_X2); 118 static DEFINE_RWLOCK(rwlock_Y1); 119 static DEFINE_RWLOCK(rwlock_Y2); 120 static DEFINE_RWLOCK(rwlock_Z1); 121 static DEFINE_RWLOCK(rwlock_Z2); 122 123 static DEFINE_MUTEX(mutex_X1); 124 static DEFINE_MUTEX(mutex_X2); 125 static DEFINE_MUTEX(mutex_Y1); 126 static DEFINE_MUTEX(mutex_Y2); 127 static DEFINE_MUTEX(mutex_Z1); 128 static DEFINE_MUTEX(mutex_Z2); 129 130 static DECLARE_RWSEM(rwsem_X1); 131 static DECLARE_RWSEM(rwsem_X2); 132 static DECLARE_RWSEM(rwsem_Y1); 133 static DECLARE_RWSEM(rwsem_Y2); 134 static DECLARE_RWSEM(rwsem_Z1); 135 static DECLARE_RWSEM(rwsem_Z2); 136 137 #ifdef CONFIG_RT_MUTEXES 138 139 static DEFINE_RT_MUTEX(rtmutex_X1); 140 static DEFINE_RT_MUTEX(rtmutex_X2); 141 static DEFINE_RT_MUTEX(rtmutex_Y1); 142 static DEFINE_RT_MUTEX(rtmutex_Y2); 143 static DEFINE_RT_MUTEX(rtmutex_Z1); 144 static DEFINE_RT_MUTEX(rtmutex_Z2); 145 146 #endif 147 148 static 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) \ 155 static noinline void \ 156 init_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 } 164 165 INIT_CLASS_FUNC(X) 166 INIT_CLASS_FUNC(Y) 167 INIT_CLASS_FUNC(Z) 168 169 static 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 \ 281 static void name(void) { E(); } 282 283 #define GENERATE_PERMUTATIONS_2_EVENTS(name) \ 284 \ 285 static void name##_12(void) { E1(); E2(); } \ 286 static void name##_21(void) { E2(); E1(); } 287 288 #define GENERATE_PERMUTATIONS_3_EVENTS(name) \ 289 \ 290 static void name##_123(void) { E1(); E2(); E3(); } \ 291 static void name##_132(void) { E1(); E3(); E2(); } \ 292 static void name##_213(void) { E2(); E1(); E3(); } \ 293 static void name##_231(void) { E2(); E3(); E1(); } \ 294 static void name##_312(void) { E3(); E1(); E2(); } \ 295 static 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" 310 GENERATE_TESTCASE(AA_spin) 311 #include "locking-selftest-wlock.h" 312 GENERATE_TESTCASE(AA_wlock) 313 #include "locking-selftest-rlock.h" 314 GENERATE_TESTCASE(AA_rlock) 315 #include "locking-selftest-mutex.h" 316 GENERATE_TESTCASE(AA_mutex) 317 #include "locking-selftest-wsem.h" 318 GENERATE_TESTCASE(AA_wsem) 319 #include "locking-selftest-rsem.h" 320 GENERATE_TESTCASE(AA_rsem) 321 322 #ifdef CONFIG_RT_MUTEXES 323 #include "locking-selftest-rtmutex.h" 324 GENERATE_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 */ 333 static void rlock_AA1(void) 334 { 335 RL(X1); 336 RL(X1); // this one should NOT fail 337 } 338 339 static void rlock_AA1B(void) 340 { 341 RL(X1); 342 RL(X2); // this one should NOT fail 343 } 344 345 static void rsem_AA1(void) 346 { 347 RSL(X1); 348 RSL(X1); // this one should fail 349 } 350 351 static 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 */ 359 static void rlock_AA2(void) 360 { 361 RL(X1); 362 WL(X2); // this one should fail 363 } 364 365 static void rsem_AA2(void) 366 { 367 RSL(X1); 368 WSL(X2); // this one should fail 369 } 370 371 static void rlock_AA3(void) 372 { 373 WL(X1); 374 RL(X2); // this one should fail 375 } 376 377 static 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 */ 389 static 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 } 401 402 static 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 */ 440 static 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 */ 464 static 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 } 476 477 static 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 */ 497 static 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 } 509 510 static 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" 536 GENERATE_TESTCASE(ABBA_spin) 537 #include "locking-selftest-wlock.h" 538 GENERATE_TESTCASE(ABBA_wlock) 539 #include "locking-selftest-rlock.h" 540 GENERATE_TESTCASE(ABBA_rlock) 541 #include "locking-selftest-mutex.h" 542 GENERATE_TESTCASE(ABBA_mutex) 543 #include "locking-selftest-wsem.h" 544 GENERATE_TESTCASE(ABBA_wsem) 545 #include "locking-selftest-rsem.h" 546 GENERATE_TESTCASE(ABBA_rsem) 547 548 #ifdef CONFIG_RT_MUTEXES 549 #include "locking-selftest-rtmutex.h" 550 GENERATE_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" 569 GENERATE_TESTCASE(ABBCCA_spin) 570 #include "locking-selftest-wlock.h" 571 GENERATE_TESTCASE(ABBCCA_wlock) 572 #include "locking-selftest-rlock.h" 573 GENERATE_TESTCASE(ABBCCA_rlock) 574 #include "locking-selftest-mutex.h" 575 GENERATE_TESTCASE(ABBCCA_mutex) 576 #include "locking-selftest-wsem.h" 577 GENERATE_TESTCASE(ABBCCA_wsem) 578 #include "locking-selftest-rsem.h" 579 GENERATE_TESTCASE(ABBCCA_rsem) 580 581 #ifdef CONFIG_RT_MUTEXES 582 #include "locking-selftest-rtmutex.h" 583 GENERATE_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" 602 GENERATE_TESTCASE(ABCABC_spin) 603 #include "locking-selftest-wlock.h" 604 GENERATE_TESTCASE(ABCABC_wlock) 605 #include "locking-selftest-rlock.h" 606 GENERATE_TESTCASE(ABCABC_rlock) 607 #include "locking-selftest-mutex.h" 608 GENERATE_TESTCASE(ABCABC_mutex) 609 #include "locking-selftest-wsem.h" 610 GENERATE_TESTCASE(ABCABC_wsem) 611 #include "locking-selftest-rsem.h" 612 GENERATE_TESTCASE(ABCABC_rsem) 613 614 #ifdef CONFIG_RT_MUTEXES 615 #include "locking-selftest-rtmutex.h" 616 GENERATE_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" 636 GENERATE_TESTCASE(ABBCCDDA_spin) 637 #include "locking-selftest-wlock.h" 638 GENERATE_TESTCASE(ABBCCDDA_wlock) 639 #include "locking-selftest-rlock.h" 640 GENERATE_TESTCASE(ABBCCDDA_rlock) 641 #include "locking-selftest-mutex.h" 642 GENERATE_TESTCASE(ABBCCDDA_mutex) 643 #include "locking-selftest-wsem.h" 644 GENERATE_TESTCASE(ABBCCDDA_wsem) 645 #include "locking-selftest-rsem.h" 646 GENERATE_TESTCASE(ABBCCDDA_rsem) 647 648 #ifdef CONFIG_RT_MUTEXES 649 #include "locking-selftest-rtmutex.h" 650 GENERATE_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" 669 GENERATE_TESTCASE(ABCDBDDA_spin) 670 #include "locking-selftest-wlock.h" 671 GENERATE_TESTCASE(ABCDBDDA_wlock) 672 #include "locking-selftest-rlock.h" 673 GENERATE_TESTCASE(ABCDBDDA_rlock) 674 #include "locking-selftest-mutex.h" 675 GENERATE_TESTCASE(ABCDBDDA_mutex) 676 #include "locking-selftest-wsem.h" 677 GENERATE_TESTCASE(ABCDBDDA_wsem) 678 #include "locking-selftest-rsem.h" 679 GENERATE_TESTCASE(ABCDBDDA_rsem) 680 681 #ifdef CONFIG_RT_MUTEXES 682 #include "locking-selftest-rtmutex.h" 683 GENERATE_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" 702 GENERATE_TESTCASE(ABCDBCDA_spin) 703 #include "locking-selftest-wlock.h" 704 GENERATE_TESTCASE(ABCDBCDA_wlock) 705 #include "locking-selftest-rlock.h" 706 GENERATE_TESTCASE(ABCDBCDA_rlock) 707 #include "locking-selftest-mutex.h" 708 GENERATE_TESTCASE(ABCDBCDA_mutex) 709 #include "locking-selftest-wsem.h" 710 GENERATE_TESTCASE(ABCDBCDA_wsem) 711 #include "locking-selftest-rsem.h" 712 GENERATE_TESTCASE(ABCDBCDA_rsem) 713 714 #ifdef CONFIG_RT_MUTEXES 715 #include "locking-selftest-rtmutex.h" 716 GENERATE_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" 740 GENERATE_TESTCASE(double_unlock_spin) 741 #include "locking-selftest-wlock.h" 742 GENERATE_TESTCASE(double_unlock_wlock) 743 #include "locking-selftest-rlock.h" 744 GENERATE_TESTCASE(double_unlock_rlock) 745 #include "locking-selftest-mutex.h" 746 GENERATE_TESTCASE(double_unlock_mutex) 747 #include "locking-selftest-wsem.h" 748 GENERATE_TESTCASE(double_unlock_wsem) 749 #include "locking-selftest-rsem.h" 750 GENERATE_TESTCASE(double_unlock_rsem) 751 752 #ifdef CONFIG_RT_MUTEXES 753 #include "locking-selftest-rtmutex.h" 754 GENERATE_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" 771 GENERATE_TESTCASE(init_held_spin) 772 #include "locking-selftest-wlock.h" 773 GENERATE_TESTCASE(init_held_wlock) 774 #include "locking-selftest-rlock.h" 775 GENERATE_TESTCASE(init_held_rlock) 776 #include "locking-selftest-mutex.h" 777 GENERATE_TESTCASE(init_held_mutex) 778 #include "locking-selftest-wsem.h" 779 GENERATE_TESTCASE(init_held_wsem) 780 #include "locking-selftest-rsem.h" 781 GENERATE_TESTCASE(init_held_rsem) 782 783 #ifdef CONFIG_RT_MUTEXES 784 #include "locking-selftest-rtmutex.h" 785 GENERATE_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" 809 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin) 810 811 #include "locking-selftest-rlock-hardirq.h" 812 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock) 813 814 #include "locking-selftest-wlock-hardirq.h" 815 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock) 816 817 #ifndef CONFIG_PREEMPT_RT 818 #include "locking-selftest-spin-softirq.h" 819 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin) 820 821 #include "locking-selftest-rlock-softirq.h" 822 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock) 823 824 #include "locking-selftest-wlock-softirq.h" 825 GENERATE_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" 853 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin) 854 855 #include "locking-selftest-wlock.h" 856 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock) 857 858 #include "locking-selftest-rlock.h" 859 GENERATE_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" 887 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin) 888 889 #include "locking-selftest-rlock-hardirq.h" 890 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock) 891 892 #include "locking-selftest-wlock-hardirq.h" 893 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock) 894 895 #ifndef CONFIG_PREEMPT_RT 896 #include "locking-selftest-spin-softirq.h" 897 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin) 898 899 #include "locking-selftest-rlock-softirq.h" 900 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock) 901 902 #include "locking-selftest-wlock-softirq.h" 903 GENERATE_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" 935 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin) 936 937 #include "locking-selftest-rlock-hardirq.h" 938 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock) 939 940 #include "locking-selftest-wlock-hardirq.h" 941 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock) 942 943 #ifndef CONFIG_PREEMPT_RT 944 #include "locking-selftest-spin-softirq.h" 945 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin) 946 947 #include "locking-selftest-rlock-softirq.h" 948 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock) 949 950 #include "locking-selftest-wlock-softirq.h" 951 GENERATE_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" 985 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin) 986 987 #include "locking-selftest-rlock-hardirq.h" 988 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock) 989 990 #include "locking-selftest-wlock-hardirq.h" 991 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock) 992 993 #ifndef CONFIG_PREEMPT_RT 994 #include "locking-selftest-spin-softirq.h" 995 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin) 996 997 #include "locking-selftest-rlock-softirq.h" 998 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock) 999 1000 #include "locking-selftest-wlock-softirq.h" 1001 GENERATE_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" 1049 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin) 1050 1051 #include "locking-selftest-rlock-hardirq.h" 1052 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock) 1053 1054 #include "locking-selftest-wlock-hardirq.h" 1055 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock) 1056 1057 #ifndef CONFIG_PREEMPT_RT 1058 #include "locking-selftest-spin-softirq.h" 1059 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin) 1060 1061 #include "locking-selftest-rlock-softirq.h" 1062 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock) 1063 1064 #include "locking-selftest-wlock-softirq.h" 1065 GENERATE_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" 1098 GENERATE_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" 1130 GENERATE_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" 1162 GENERATE_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" 1194 GENERATE_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" 1229 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_rlock) 1230 1231 #include "locking-selftest-wlock.h" 1232 GENERATE_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" 1237 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_rlock) 1238 1239 #include "locking-selftest-wlock.h" 1240 GENERATE_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" 1277 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_rlock) 1278 1279 #include "locking-selftest-wlock.h" 1280 GENERATE_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" 1285 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_rlock) 1286 1287 #include "locking-selftest-wlock.h" 1288 GENERATE_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" 1333 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_rlock) 1334 1335 #include "locking-selftest-wlock.h" 1336 GENERATE_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" 1341 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_rlock) 1342 1343 #include "locking-selftest-wlock.h" 1344 GENERATE_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 1396 static 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 1425 static int testcase_total; 1426 static int testcase_successes; 1427 static int expected_testcase_failures; 1428 static int unexpected_testcase_failures; 1429 1430 static 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 1500 static 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 1669 static 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 1719 static 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 1780 static void ww_test_two_contexts(void) 1781 { 1782 WWAI(&t); 1783 WWAI(&t2); 1784 } 1785 1786 static 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 1795 static void ww_test_context_done_twice(void) 1796 { 1797 WWAI(&t); 1798 WWAD(&t); 1799 WWAD(&t); 1800 WWAF(&t); 1801 } 1802 1803 static void ww_test_context_unlock_twice(void) 1804 { 1805 WWAI(&t); 1806 WWAD(&t); 1807 WWAF(&t); 1808 WWAF(&t); 1809 } 1810 1811 static void ww_test_context_fini_early(void) 1812 { 1813 WWAI(&t); 1814 WWL(&o, &t); 1815 WWAD(&t); 1816 WWAF(&t); 1817 } 1818 1819 static void ww_test_context_lock_after_done(void) 1820 { 1821 WWAI(&t); 1822 WWAD(&t); 1823 WWL(&o, &t); 1824 } 1825 1826 static void ww_test_object_unlock_twice(void) 1827 { 1828 WWL1(&o); 1829 WWU(&o); 1830 WWU(&o); 1831 } 1832 1833 static 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 1842 static void ww_test_object_lock_stale_context(void) 1843 { 1844 WWAI(&t); 1845 o.ctx = &t2; 1846 WWL(&o, &t); 1847 } 1848 1849 static 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 1875 static 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 1901 static 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 1926 static 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 1951 static 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 1972 static 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 1993 static 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 2019 static 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 2044 static 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 2069 static 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 2094 static 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 */ 2101 static 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 2113 static void ww_test_unneeded_slow(void) 2114 { 2115 WWAI(&t); 2116 2117 ww_mutex_lock_slow(&o, &t); 2118 } 2119 2120 static 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 2131 static 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 2146 static 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 2162 static 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 2174 static 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 2186 static 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 2199 static void ww_test_block_block(void) 2200 { 2201 WWL1(&o); 2202 WWL1(&o2); 2203 } 2204 2205 static void ww_test_block_try(void) 2206 { 2207 bool ret; 2208 2209 WWL1(&o); 2210 ret = WWT(&o2); 2211 WARN_ON(!ret); 2212 } 2213 2214 static 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 2225 static 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 2241 static 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 2261 static 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 2283 static 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 */ 2374 static 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 */ 2401 static 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 */ 2428 static 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 2447 static 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 2465 static 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 2472 static 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 2479 static 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 2490 static 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 #define __guard(cleanup) __maybe_unused __attribute__((__cleanup__(cleanup))) 2510 2511 static void hardirq_exit(int *_) 2512 { 2513 HARDIRQ_EXIT(); 2514 } 2515 2516 #define HARDIRQ_CONTEXT(name, ...) \ 2517 int hardirq_guard_##name __guard(hardirq_exit); \ 2518 HARDIRQ_ENTER(); 2519 2520 #define NOTTHREADED_HARDIRQ_CONTEXT(name, ...) \ 2521 int notthreaded_hardirq_guard_##name __guard(hardirq_exit); \ 2522 local_irq_disable(); \ 2523 __irq_enter(); \ 2524 WARN_ON(!in_irq()); 2525 2526 static void softirq_exit(int *_) 2527 { 2528 SOFTIRQ_EXIT(); 2529 } 2530 2531 #define SOFTIRQ_CONTEXT(name, ...) \ 2532 int softirq_guard_##name __guard(softirq_exit); \ 2533 SOFTIRQ_ENTER(); 2534 2535 static void rcu_exit(int *_) 2536 { 2537 rcu_read_unlock(); 2538 } 2539 2540 #define RCU_CONTEXT(name, ...) \ 2541 int rcu_guard_##name __guard(rcu_exit); \ 2542 rcu_read_lock(); 2543 2544 static void rcu_bh_exit(int *_) 2545 { 2546 rcu_read_unlock_bh(); 2547 } 2548 2549 #define RCU_BH_CONTEXT(name, ...) \ 2550 int rcu_bh_guard_##name __guard(rcu_bh_exit); \ 2551 rcu_read_lock_bh(); 2552 2553 static void rcu_sched_exit(int *_) 2554 { 2555 rcu_read_unlock_sched(); 2556 } 2557 2558 #define RCU_SCHED_CONTEXT(name, ...) \ 2559 int rcu_sched_guard_##name __guard(rcu_sched_exit); \ 2560 rcu_read_lock_sched(); 2561 2562 static void raw_spinlock_exit(raw_spinlock_t **lock) 2563 { 2564 raw_spin_unlock(*lock); 2565 } 2566 2567 #define RAW_SPINLOCK_CONTEXT(name, lock) \ 2568 raw_spinlock_t *raw_spinlock_guard_##name __guard(raw_spinlock_exit) = &(lock); \ 2569 raw_spin_lock(&(lock)); 2570 2571 static void spinlock_exit(spinlock_t **lock) 2572 { 2573 spin_unlock(*lock); 2574 } 2575 2576 #define SPINLOCK_CONTEXT(name, lock) \ 2577 spinlock_t *spinlock_guard_##name __guard(spinlock_exit) = &(lock); \ 2578 spin_lock(&(lock)); 2579 2580 static void mutex_exit(struct mutex **lock) 2581 { 2582 mutex_unlock(*lock); 2583 } 2584 2585 #define MUTEX_CONTEXT(name, lock) \ 2586 struct mutex *mutex_guard_##name __guard(mutex_exit) = &(lock); \ 2587 mutex_lock(&(lock)); 2588 2589 #define GENERATE_2_CONTEXT_TESTCASE(outer, outer_lock, inner, inner_lock) \ 2590 \ 2591 static void __maybe_unused inner##_in_##outer(void) \ 2592 { \ 2593 outer##_CONTEXT(_, outer_lock); \ 2594 { \ 2595 inner##_CONTEXT(_, inner_lock); \ 2596 } \ 2597 } 2598 2599 /* 2600 * wait contexts (considering PREEMPT_RT) 2601 * 2602 * o: inner is allowed in outer 2603 * x: inner is disallowed in outer 2604 * 2605 * \ inner | RCU | RAW_SPIN | SPIN | MUTEX 2606 * outer \ | | | | 2607 * ---------------+-------+----------+------+------- 2608 * HARDIRQ | o | o | o | x 2609 * ---------------+-------+----------+------+------- 2610 * NOTTHREADED_IRQ| o | o | x | x 2611 * ---------------+-------+----------+------+------- 2612 * SOFTIRQ | o | o | o | x 2613 * ---------------+-------+----------+------+------- 2614 * RCU | o | o | o | x 2615 * ---------------+-------+----------+------+------- 2616 * RCU_BH | o | o | o | x 2617 * ---------------+-------+----------+------+------- 2618 * RCU_SCHED | o | o | x | x 2619 * ---------------+-------+----------+------+------- 2620 * RAW_SPIN | o | o | x | x 2621 * ---------------+-------+----------+------+------- 2622 * SPIN | o | o | o | x 2623 * ---------------+-------+----------+------+------- 2624 * MUTEX | o | o | o | o 2625 * ---------------+-------+----------+------+------- 2626 */ 2627 2628 #define GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(inner, inner_lock) \ 2629 GENERATE_2_CONTEXT_TESTCASE(HARDIRQ, , inner, inner_lock) \ 2630 GENERATE_2_CONTEXT_TESTCASE(NOTTHREADED_HARDIRQ, , inner, inner_lock) \ 2631 GENERATE_2_CONTEXT_TESTCASE(SOFTIRQ, , inner, inner_lock) \ 2632 GENERATE_2_CONTEXT_TESTCASE(RCU, , inner, inner_lock) \ 2633 GENERATE_2_CONTEXT_TESTCASE(RCU_BH, , inner, inner_lock) \ 2634 GENERATE_2_CONTEXT_TESTCASE(RCU_SCHED, , inner, inner_lock) \ 2635 GENERATE_2_CONTEXT_TESTCASE(RAW_SPINLOCK, raw_lock_A, inner, inner_lock) \ 2636 GENERATE_2_CONTEXT_TESTCASE(SPINLOCK, lock_A, inner, inner_lock) \ 2637 GENERATE_2_CONTEXT_TESTCASE(MUTEX, mutex_A, inner, inner_lock) 2638 2639 GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RCU, ) 2640 GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RAW_SPINLOCK, raw_lock_B) 2641 GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(SPINLOCK, lock_B) 2642 GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(MUTEX, mutex_B) 2643 2644 /* the outer context allows all kinds of preemption */ 2645 #define DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(outer) \ 2646 dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \ 2647 dotest(RAW_SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ 2648 dotest(SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ 2649 dotest(MUTEX_in_##outer, SUCCESS, LOCKTYPE_MUTEX); \ 2650 2651 /* 2652 * the outer context only allows the preemption introduced by spinlock_t (which 2653 * is a sleepable lock for PREEMPT_RT) 2654 */ 2655 #define DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(outer) \ 2656 dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \ 2657 dotest(RAW_SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ 2658 dotest(SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ 2659 dotest(MUTEX_in_##outer, FAILURE, LOCKTYPE_MUTEX); \ 2660 2661 /* the outer doesn't allows any kind of preemption */ 2662 #define DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(outer) \ 2663 dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \ 2664 dotest(RAW_SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ 2665 dotest(SPINLOCK_in_##outer, FAILURE, LOCKTYPE_SPIN); \ 2666 dotest(MUTEX_in_##outer, FAILURE, LOCKTYPE_MUTEX); \ 2667 2668 static void wait_context_tests(void) 2669 { 2670 printk(" --------------------------------------------------------------------------\n"); 2671 printk(" | wait context tests |\n"); 2672 printk(" --------------------------------------------------------------------------\n"); 2673 printk(" | rcu | raw | spin |mutex |\n"); 2674 printk(" --------------------------------------------------------------------------\n"); 2675 print_testname("in hardirq context"); 2676 DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(HARDIRQ); 2677 pr_cont("\n"); 2678 2679 print_testname("in hardirq context (not threaded)"); 2680 DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(NOTTHREADED_HARDIRQ); 2681 pr_cont("\n"); 2682 2683 print_testname("in softirq context"); 2684 DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SOFTIRQ); 2685 pr_cont("\n"); 2686 2687 print_testname("in RCU context"); 2688 DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU); 2689 pr_cont("\n"); 2690 2691 print_testname("in RCU-bh context"); 2692 DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU_BH); 2693 pr_cont("\n"); 2694 2695 print_testname("in RCU-sched context"); 2696 DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RCU_SCHED); 2697 pr_cont("\n"); 2698 2699 print_testname("in RAW_SPINLOCK context"); 2700 DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RAW_SPINLOCK); 2701 pr_cont("\n"); 2702 2703 print_testname("in SPINLOCK context"); 2704 DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SPINLOCK); 2705 pr_cont("\n"); 2706 2707 print_testname("in MUTEX context"); 2708 DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(MUTEX); 2709 pr_cont("\n"); 2710 } 2711 2712 static void local_lock_2(void) 2713 { 2714 local_lock(&local_A); /* IRQ-ON */ 2715 local_unlock(&local_A); 2716 2717 HARDIRQ_ENTER(); 2718 spin_lock(&lock_A); /* IN-IRQ */ 2719 spin_unlock(&lock_A); 2720 HARDIRQ_EXIT() 2721 2722 HARDIRQ_DISABLE(); 2723 spin_lock(&lock_A); 2724 local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle, false */ 2725 local_unlock(&local_A); 2726 spin_unlock(&lock_A); 2727 HARDIRQ_ENABLE(); 2728 } 2729 2730 static void local_lock_3A(void) 2731 { 2732 local_lock(&local_A); /* IRQ-ON */ 2733 spin_lock(&lock_B); /* IRQ-ON */ 2734 spin_unlock(&lock_B); 2735 local_unlock(&local_A); 2736 2737 HARDIRQ_ENTER(); 2738 spin_lock(&lock_A); /* IN-IRQ */ 2739 spin_unlock(&lock_A); 2740 HARDIRQ_EXIT() 2741 2742 HARDIRQ_DISABLE(); 2743 spin_lock(&lock_A); 2744 local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */ 2745 local_unlock(&local_A); 2746 spin_unlock(&lock_A); 2747 HARDIRQ_ENABLE(); 2748 } 2749 2750 static void local_lock_3B(void) 2751 { 2752 local_lock(&local_A); /* IRQ-ON */ 2753 spin_lock(&lock_B); /* IRQ-ON */ 2754 spin_unlock(&lock_B); 2755 local_unlock(&local_A); 2756 2757 HARDIRQ_ENTER(); 2758 spin_lock(&lock_A); /* IN-IRQ */ 2759 spin_unlock(&lock_A); 2760 HARDIRQ_EXIT() 2761 2762 HARDIRQ_DISABLE(); 2763 spin_lock(&lock_A); 2764 local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */ 2765 local_unlock(&local_A); 2766 spin_unlock(&lock_A); 2767 HARDIRQ_ENABLE(); 2768 2769 HARDIRQ_DISABLE(); 2770 spin_lock(&lock_A); 2771 spin_lock(&lock_B); /* IN-IRQ <-> IRQ-ON cycle, true */ 2772 spin_unlock(&lock_B); 2773 spin_unlock(&lock_A); 2774 HARDIRQ_DISABLE(); 2775 2776 } 2777 2778 static void local_lock_tests(void) 2779 { 2780 printk(" --------------------------------------------------------------------------\n"); 2781 printk(" | local_lock tests |\n"); 2782 printk(" ---------------------\n"); 2783 2784 print_testname("local_lock inversion 2"); 2785 dotest(local_lock_2, SUCCESS, LOCKTYPE_LL); 2786 pr_cont("\n"); 2787 2788 print_testname("local_lock inversion 3A"); 2789 dotest(local_lock_3A, SUCCESS, LOCKTYPE_LL); 2790 pr_cont("\n"); 2791 2792 print_testname("local_lock inversion 3B"); 2793 dotest(local_lock_3B, FAILURE, LOCKTYPE_LL); 2794 pr_cont("\n"); 2795 } 2796 2797 static void hardirq_deadlock_softirq_not_deadlock(void) 2798 { 2799 /* mutex_A is hardirq-unsafe and softirq-unsafe */ 2800 /* mutex_A -> lock_C */ 2801 mutex_lock(&mutex_A); 2802 HARDIRQ_DISABLE(); 2803 spin_lock(&lock_C); 2804 spin_unlock(&lock_C); 2805 HARDIRQ_ENABLE(); 2806 mutex_unlock(&mutex_A); 2807 2808 /* lock_A is hardirq-safe */ 2809 HARDIRQ_ENTER(); 2810 spin_lock(&lock_A); 2811 spin_unlock(&lock_A); 2812 HARDIRQ_EXIT(); 2813 2814 /* lock_A -> lock_B */ 2815 HARDIRQ_DISABLE(); 2816 spin_lock(&lock_A); 2817 spin_lock(&lock_B); 2818 spin_unlock(&lock_B); 2819 spin_unlock(&lock_A); 2820 HARDIRQ_ENABLE(); 2821 2822 /* lock_B -> lock_C */ 2823 HARDIRQ_DISABLE(); 2824 spin_lock(&lock_B); 2825 spin_lock(&lock_C); 2826 spin_unlock(&lock_C); 2827 spin_unlock(&lock_B); 2828 HARDIRQ_ENABLE(); 2829 2830 /* lock_D is softirq-safe */ 2831 SOFTIRQ_ENTER(); 2832 spin_lock(&lock_D); 2833 spin_unlock(&lock_D); 2834 SOFTIRQ_EXIT(); 2835 2836 /* And lock_D is hardirq-unsafe */ 2837 SOFTIRQ_DISABLE(); 2838 spin_lock(&lock_D); 2839 spin_unlock(&lock_D); 2840 SOFTIRQ_ENABLE(); 2841 2842 /* 2843 * mutex_A -> lock_C -> lock_D is softirq-unsafe -> softirq-safe, not 2844 * deadlock. 2845 * 2846 * lock_A -> lock_B -> lock_C -> lock_D is hardirq-safe -> 2847 * hardirq-unsafe, deadlock. 2848 */ 2849 HARDIRQ_DISABLE(); 2850 spin_lock(&lock_C); 2851 spin_lock(&lock_D); 2852 spin_unlock(&lock_D); 2853 spin_unlock(&lock_C); 2854 HARDIRQ_ENABLE(); 2855 } 2856 2857 void locking_selftest(void) 2858 { 2859 /* 2860 * Got a locking failure before the selftest ran? 2861 */ 2862 if (!debug_locks) { 2863 printk("----------------------------------\n"); 2864 printk("| Locking API testsuite disabled |\n"); 2865 printk("----------------------------------\n"); 2866 return; 2867 } 2868 2869 /* 2870 * treats read_lock() as recursive read locks for testing purpose 2871 */ 2872 force_read_lock_recursive = 1; 2873 2874 /* 2875 * Run the testsuite: 2876 */ 2877 printk("------------------------\n"); 2878 printk("| Locking API testsuite:\n"); 2879 printk("----------------------------------------------------------------------------\n"); 2880 printk(" | spin |wlock |rlock |mutex | wsem | rsem |rtmutex\n"); 2881 printk(" --------------------------------------------------------------------------\n"); 2882 2883 init_shared_classes(); 2884 lockdep_set_selftest_task(current); 2885 2886 DO_TESTCASE_6R("A-A deadlock", AA); 2887 DO_TESTCASE_6R("A-B-B-A deadlock", ABBA); 2888 DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA); 2889 DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC); 2890 DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA); 2891 DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA); 2892 DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA); 2893 DO_TESTCASE_6("double unlock", double_unlock); 2894 DO_TESTCASE_6("initialize held", init_held); 2895 2896 printk(" --------------------------------------------------------------------------\n"); 2897 print_testname("recursive read-lock"); 2898 pr_cont(" |"); 2899 dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK); 2900 pr_cont(" |"); 2901 dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM); 2902 pr_cont("\n"); 2903 2904 print_testname("recursive read-lock #2"); 2905 pr_cont(" |"); 2906 dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK); 2907 pr_cont(" |"); 2908 dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM); 2909 pr_cont("\n"); 2910 2911 print_testname("mixed read-write-lock"); 2912 pr_cont(" |"); 2913 dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK); 2914 pr_cont(" |"); 2915 dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM); 2916 pr_cont("\n"); 2917 2918 print_testname("mixed write-read-lock"); 2919 pr_cont(" |"); 2920 dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK); 2921 pr_cont(" |"); 2922 dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM); 2923 pr_cont("\n"); 2924 2925 print_testname("mixed read-lock/lock-write ABBA"); 2926 pr_cont(" |"); 2927 dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK); 2928 pr_cont(" |"); 2929 dotest(rwsem_ABBA1, FAILURE, LOCKTYPE_RWSEM); 2930 2931 print_testname("mixed read-lock/lock-read ABBA"); 2932 pr_cont(" |"); 2933 dotest(rlock_ABBA2, SUCCESS, LOCKTYPE_RWLOCK); 2934 pr_cont(" |"); 2935 dotest(rwsem_ABBA2, FAILURE, LOCKTYPE_RWSEM); 2936 2937 print_testname("mixed write-lock/lock-write ABBA"); 2938 pr_cont(" |"); 2939 dotest(rlock_ABBA3, FAILURE, LOCKTYPE_RWLOCK); 2940 pr_cont(" |"); 2941 dotest(rwsem_ABBA3, FAILURE, LOCKTYPE_RWSEM); 2942 2943 print_testname("chain cached mixed R-L/L-W ABBA"); 2944 pr_cont(" |"); 2945 dotest(rlock_chaincache_ABBA1, FAILURE, LOCKTYPE_RWLOCK); 2946 2947 DO_TESTCASE_6x1RRB("rlock W1R2/W2R3/W3R1", W1R2_W2R3_W3R1); 2948 DO_TESTCASE_6x1RRB("rlock W1W2/R2R3/W3R1", W1W2_R2R3_W3R1); 2949 DO_TESTCASE_6x1RR("rlock W1W2/R2R3/R3W1", W1W2_R2R3_R3W1); 2950 DO_TESTCASE_6x1RR("rlock W1R2/R2R3/W3W1", W1R2_R2R3_W3W1); 2951 2952 printk(" --------------------------------------------------------------------------\n"); 2953 /* 2954 * irq-context testcases: 2955 */ 2956 DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1); 2957 NON_RT(DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A)); 2958 DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B); 2959 DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3); 2960 DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4); 2961 DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion); 2962 2963 DO_TESTCASE_6x2x2RW("irq read-recursion", irq_read_recursion); 2964 DO_TESTCASE_6x2x2RW("irq read-recursion #2", irq_read_recursion2); 2965 DO_TESTCASE_6x2x2RW("irq read-recursion #3", irq_read_recursion3); 2966 2967 ww_tests(); 2968 2969 force_read_lock_recursive = 0; 2970 /* 2971 * queued_read_lock() specific test cases can be put here 2972 */ 2973 if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS)) 2974 queued_read_lock_tests(); 2975 2976 fs_reclaim_tests(); 2977 2978 /* Wait context test cases that are specific for RAW_LOCK_NESTING */ 2979 if (IS_ENABLED(CONFIG_PROVE_RAW_LOCK_NESTING)) 2980 wait_context_tests(); 2981 2982 local_lock_tests(); 2983 2984 print_testname("hardirq_unsafe_softirq_safe"); 2985 dotest(hardirq_deadlock_softirq_not_deadlock, FAILURE, LOCKTYPE_SPECIAL); 2986 pr_cont("\n"); 2987 2988 if (unexpected_testcase_failures) { 2989 printk("-----------------------------------------------------------------\n"); 2990 debug_locks = 0; 2991 printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n", 2992 unexpected_testcase_failures, testcase_total); 2993 printk("-----------------------------------------------------------------\n"); 2994 } else if (expected_testcase_failures && testcase_successes) { 2995 printk("--------------------------------------------------------\n"); 2996 printk("%3d out of %3d testcases failed, as expected. |\n", 2997 expected_testcase_failures, testcase_total); 2998 printk("----------------------------------------------------\n"); 2999 debug_locks = 1; 3000 } else if (expected_testcase_failures && !testcase_successes) { 3001 printk("--------------------------------------------------------\n"); 3002 printk("All %3d testcases failed, as expected. |\n", 3003 expected_testcase_failures); 3004 printk("----------------------------------------\n"); 3005 debug_locks = 1; 3006 } else { 3007 printk("-------------------------------------------------------\n"); 3008 printk("Good, all %3d testcases passed! |\n", 3009 testcase_successes); 3010 printk("---------------------------------\n"); 3011 debug_locks = 1; 3012 } 3013 lockdep_set_selftest_task(NULL); 3014 debug_locks_silent = 0; 3015 } 3016