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/delay.h> 19 #include <linux/lockdep.h> 20 #include <linux/spinlock.h> 21 #include <linux/kallsyms.h> 22 #include <linux/interrupt.h> 23 #include <linux/debug_locks.h> 24 #include <linux/irqflags.h> 25 #include <linux/rtmutex.h> 26 27 /* 28 * Change this to 1 if you want to see the failure printouts: 29 */ 30 static unsigned int debug_locks_verbose; 31 32 static DEFINE_WD_CLASS(ww_lockdep); 33 34 static int __init setup_debug_locks_verbose(char *str) 35 { 36 get_option(&str, &debug_locks_verbose); 37 38 return 1; 39 } 40 41 __setup("debug_locks_verbose=", setup_debug_locks_verbose); 42 43 #define FAILURE 0 44 #define SUCCESS 1 45 46 #define LOCKTYPE_SPIN 0x1 47 #define LOCKTYPE_RWLOCK 0x2 48 #define LOCKTYPE_MUTEX 0x4 49 #define LOCKTYPE_RWSEM 0x8 50 #define LOCKTYPE_WW 0x10 51 #define LOCKTYPE_RTMUTEX 0x20 52 53 static struct ww_acquire_ctx t, t2; 54 static struct ww_mutex o, o2, o3; 55 56 /* 57 * Normal standalone locks, for the circular and irq-context 58 * dependency tests: 59 */ 60 static DEFINE_RAW_SPINLOCK(lock_A); 61 static DEFINE_RAW_SPINLOCK(lock_B); 62 static DEFINE_RAW_SPINLOCK(lock_C); 63 static DEFINE_RAW_SPINLOCK(lock_D); 64 65 static DEFINE_RWLOCK(rwlock_A); 66 static DEFINE_RWLOCK(rwlock_B); 67 static DEFINE_RWLOCK(rwlock_C); 68 static DEFINE_RWLOCK(rwlock_D); 69 70 static DEFINE_MUTEX(mutex_A); 71 static DEFINE_MUTEX(mutex_B); 72 static DEFINE_MUTEX(mutex_C); 73 static DEFINE_MUTEX(mutex_D); 74 75 static DECLARE_RWSEM(rwsem_A); 76 static DECLARE_RWSEM(rwsem_B); 77 static DECLARE_RWSEM(rwsem_C); 78 static DECLARE_RWSEM(rwsem_D); 79 80 #ifdef CONFIG_RT_MUTEXES 81 82 static DEFINE_RT_MUTEX(rtmutex_A); 83 static DEFINE_RT_MUTEX(rtmutex_B); 84 static DEFINE_RT_MUTEX(rtmutex_C); 85 static DEFINE_RT_MUTEX(rtmutex_D); 86 87 #endif 88 89 /* 90 * Locks that we initialize dynamically as well so that 91 * e.g. X1 and X2 becomes two instances of the same class, 92 * but X* and Y* are different classes. We do this so that 93 * we do not trigger a real lockup: 94 */ 95 static DEFINE_RAW_SPINLOCK(lock_X1); 96 static DEFINE_RAW_SPINLOCK(lock_X2); 97 static DEFINE_RAW_SPINLOCK(lock_Y1); 98 static DEFINE_RAW_SPINLOCK(lock_Y2); 99 static DEFINE_RAW_SPINLOCK(lock_Z1); 100 static DEFINE_RAW_SPINLOCK(lock_Z2); 101 102 static DEFINE_RWLOCK(rwlock_X1); 103 static DEFINE_RWLOCK(rwlock_X2); 104 static DEFINE_RWLOCK(rwlock_Y1); 105 static DEFINE_RWLOCK(rwlock_Y2); 106 static DEFINE_RWLOCK(rwlock_Z1); 107 static DEFINE_RWLOCK(rwlock_Z2); 108 109 static DEFINE_MUTEX(mutex_X1); 110 static DEFINE_MUTEX(mutex_X2); 111 static DEFINE_MUTEX(mutex_Y1); 112 static DEFINE_MUTEX(mutex_Y2); 113 static DEFINE_MUTEX(mutex_Z1); 114 static DEFINE_MUTEX(mutex_Z2); 115 116 static DECLARE_RWSEM(rwsem_X1); 117 static DECLARE_RWSEM(rwsem_X2); 118 static DECLARE_RWSEM(rwsem_Y1); 119 static DECLARE_RWSEM(rwsem_Y2); 120 static DECLARE_RWSEM(rwsem_Z1); 121 static DECLARE_RWSEM(rwsem_Z2); 122 123 #ifdef CONFIG_RT_MUTEXES 124 125 static DEFINE_RT_MUTEX(rtmutex_X1); 126 static DEFINE_RT_MUTEX(rtmutex_X2); 127 static DEFINE_RT_MUTEX(rtmutex_Y1); 128 static DEFINE_RT_MUTEX(rtmutex_Y2); 129 static DEFINE_RT_MUTEX(rtmutex_Z1); 130 static DEFINE_RT_MUTEX(rtmutex_Z2); 131 132 #endif 133 134 /* 135 * non-inlined runtime initializers, to let separate locks share 136 * the same lock-class: 137 */ 138 #define INIT_CLASS_FUNC(class) \ 139 static noinline void \ 140 init_class_##class(raw_spinlock_t *lock, rwlock_t *rwlock, \ 141 struct mutex *mutex, struct rw_semaphore *rwsem)\ 142 { \ 143 raw_spin_lock_init(lock); \ 144 rwlock_init(rwlock); \ 145 mutex_init(mutex); \ 146 init_rwsem(rwsem); \ 147 } 148 149 INIT_CLASS_FUNC(X) 150 INIT_CLASS_FUNC(Y) 151 INIT_CLASS_FUNC(Z) 152 153 static void init_shared_classes(void) 154 { 155 #ifdef CONFIG_RT_MUTEXES 156 static struct lock_class_key rt_X, rt_Y, rt_Z; 157 158 __rt_mutex_init(&rtmutex_X1, __func__, &rt_X); 159 __rt_mutex_init(&rtmutex_X2, __func__, &rt_X); 160 __rt_mutex_init(&rtmutex_Y1, __func__, &rt_Y); 161 __rt_mutex_init(&rtmutex_Y2, __func__, &rt_Y); 162 __rt_mutex_init(&rtmutex_Z1, __func__, &rt_Z); 163 __rt_mutex_init(&rtmutex_Z2, __func__, &rt_Z); 164 #endif 165 166 init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1); 167 init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2); 168 169 init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1); 170 init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2); 171 172 init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1); 173 init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2); 174 } 175 176 /* 177 * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests. 178 * The following functions use a lock from a simulated hardirq/softirq 179 * context, causing the locks to be marked as hardirq-safe/softirq-safe: 180 */ 181 182 #define HARDIRQ_DISABLE local_irq_disable 183 #define HARDIRQ_ENABLE local_irq_enable 184 185 #define HARDIRQ_ENTER() \ 186 local_irq_disable(); \ 187 __irq_enter(); \ 188 WARN_ON(!in_irq()); 189 190 #define HARDIRQ_EXIT() \ 191 __irq_exit(); \ 192 local_irq_enable(); 193 194 #define SOFTIRQ_DISABLE local_bh_disable 195 #define SOFTIRQ_ENABLE local_bh_enable 196 197 #define SOFTIRQ_ENTER() \ 198 local_bh_disable(); \ 199 local_irq_disable(); \ 200 lockdep_softirq_enter(); \ 201 WARN_ON(!in_softirq()); 202 203 #define SOFTIRQ_EXIT() \ 204 lockdep_softirq_exit(); \ 205 local_irq_enable(); \ 206 local_bh_enable(); 207 208 /* 209 * Shortcuts for lock/unlock API variants, to keep 210 * the testcases compact: 211 */ 212 #define L(x) raw_spin_lock(&lock_##x) 213 #define U(x) raw_spin_unlock(&lock_##x) 214 #define LU(x) L(x); U(x) 215 #define SI(x) raw_spin_lock_init(&lock_##x) 216 217 #define WL(x) write_lock(&rwlock_##x) 218 #define WU(x) write_unlock(&rwlock_##x) 219 #define WLU(x) WL(x); WU(x) 220 221 #define RL(x) read_lock(&rwlock_##x) 222 #define RU(x) read_unlock(&rwlock_##x) 223 #define RLU(x) RL(x); RU(x) 224 #define RWI(x) rwlock_init(&rwlock_##x) 225 226 #define ML(x) mutex_lock(&mutex_##x) 227 #define MU(x) mutex_unlock(&mutex_##x) 228 #define MI(x) mutex_init(&mutex_##x) 229 230 #define RTL(x) rt_mutex_lock(&rtmutex_##x) 231 #define RTU(x) rt_mutex_unlock(&rtmutex_##x) 232 #define RTI(x) rt_mutex_init(&rtmutex_##x) 233 234 #define WSL(x) down_write(&rwsem_##x) 235 #define WSU(x) up_write(&rwsem_##x) 236 237 #define RSL(x) down_read(&rwsem_##x) 238 #define RSU(x) up_read(&rwsem_##x) 239 #define RWSI(x) init_rwsem(&rwsem_##x) 240 241 #ifndef CONFIG_DEBUG_WW_MUTEX_SLOWPATH 242 #define WWAI(x) ww_acquire_init(x, &ww_lockdep) 243 #else 244 #define WWAI(x) do { ww_acquire_init(x, &ww_lockdep); (x)->deadlock_inject_countdown = ~0U; } while (0) 245 #endif 246 #define WWAD(x) ww_acquire_done(x) 247 #define WWAF(x) ww_acquire_fini(x) 248 249 #define WWL(x, c) ww_mutex_lock(x, c) 250 #define WWT(x) ww_mutex_trylock(x) 251 #define WWL1(x) ww_mutex_lock(x, NULL) 252 #define WWU(x) ww_mutex_unlock(x) 253 254 255 #define LOCK_UNLOCK_2(x,y) LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x) 256 257 /* 258 * Generate different permutations of the same testcase, using 259 * the same basic lock-dependency/state events: 260 */ 261 262 #define GENERATE_TESTCASE(name) \ 263 \ 264 static void name(void) { E(); } 265 266 #define GENERATE_PERMUTATIONS_2_EVENTS(name) \ 267 \ 268 static void name##_12(void) { E1(); E2(); } \ 269 static void name##_21(void) { E2(); E1(); } 270 271 #define GENERATE_PERMUTATIONS_3_EVENTS(name) \ 272 \ 273 static void name##_123(void) { E1(); E2(); E3(); } \ 274 static void name##_132(void) { E1(); E3(); E2(); } \ 275 static void name##_213(void) { E2(); E1(); E3(); } \ 276 static void name##_231(void) { E2(); E3(); E1(); } \ 277 static void name##_312(void) { E3(); E1(); E2(); } \ 278 static void name##_321(void) { E3(); E2(); E1(); } 279 280 /* 281 * AA deadlock: 282 */ 283 284 #define E() \ 285 \ 286 LOCK(X1); \ 287 LOCK(X2); /* this one should fail */ 288 289 /* 290 * 6 testcases: 291 */ 292 #include "locking-selftest-spin.h" 293 GENERATE_TESTCASE(AA_spin) 294 #include "locking-selftest-wlock.h" 295 GENERATE_TESTCASE(AA_wlock) 296 #include "locking-selftest-rlock.h" 297 GENERATE_TESTCASE(AA_rlock) 298 #include "locking-selftest-mutex.h" 299 GENERATE_TESTCASE(AA_mutex) 300 #include "locking-selftest-wsem.h" 301 GENERATE_TESTCASE(AA_wsem) 302 #include "locking-selftest-rsem.h" 303 GENERATE_TESTCASE(AA_rsem) 304 305 #ifdef CONFIG_RT_MUTEXES 306 #include "locking-selftest-rtmutex.h" 307 GENERATE_TESTCASE(AA_rtmutex); 308 #endif 309 310 #undef E 311 312 /* 313 * Special-case for read-locking, they are 314 * allowed to recurse on the same lock class: 315 */ 316 static void rlock_AA1(void) 317 { 318 RL(X1); 319 RL(X1); // this one should NOT fail 320 } 321 322 static void rlock_AA1B(void) 323 { 324 RL(X1); 325 RL(X2); // this one should NOT fail 326 } 327 328 static void rsem_AA1(void) 329 { 330 RSL(X1); 331 RSL(X1); // this one should fail 332 } 333 334 static void rsem_AA1B(void) 335 { 336 RSL(X1); 337 RSL(X2); // this one should fail 338 } 339 /* 340 * The mixing of read and write locks is not allowed: 341 */ 342 static void rlock_AA2(void) 343 { 344 RL(X1); 345 WL(X2); // this one should fail 346 } 347 348 static void rsem_AA2(void) 349 { 350 RSL(X1); 351 WSL(X2); // this one should fail 352 } 353 354 static void rlock_AA3(void) 355 { 356 WL(X1); 357 RL(X2); // this one should fail 358 } 359 360 static void rsem_AA3(void) 361 { 362 WSL(X1); 363 RSL(X2); // this one should fail 364 } 365 366 /* 367 * read_lock(A) 368 * spin_lock(B) 369 * spin_lock(B) 370 * write_lock(A) 371 */ 372 static void rlock_ABBA1(void) 373 { 374 RL(X1); 375 L(Y1); 376 U(Y1); 377 RU(X1); 378 379 L(Y1); 380 WL(X1); 381 WU(X1); 382 U(Y1); // should fail 383 } 384 385 static void rwsem_ABBA1(void) 386 { 387 RSL(X1); 388 ML(Y1); 389 MU(Y1); 390 RSU(X1); 391 392 ML(Y1); 393 WSL(X1); 394 WSU(X1); 395 MU(Y1); // should fail 396 } 397 398 /* 399 * read_lock(A) 400 * spin_lock(B) 401 * spin_lock(B) 402 * read_lock(A) 403 */ 404 static void rlock_ABBA2(void) 405 { 406 RL(X1); 407 L(Y1); 408 U(Y1); 409 RU(X1); 410 411 L(Y1); 412 RL(X1); 413 RU(X1); 414 U(Y1); // should NOT fail 415 } 416 417 static void rwsem_ABBA2(void) 418 { 419 RSL(X1); 420 ML(Y1); 421 MU(Y1); 422 RSU(X1); 423 424 ML(Y1); 425 RSL(X1); 426 RSU(X1); 427 MU(Y1); // should fail 428 } 429 430 431 /* 432 * write_lock(A) 433 * spin_lock(B) 434 * spin_lock(B) 435 * write_lock(A) 436 */ 437 static void rlock_ABBA3(void) 438 { 439 WL(X1); 440 L(Y1); 441 U(Y1); 442 WU(X1); 443 444 L(Y1); 445 WL(X1); 446 WU(X1); 447 U(Y1); // should fail 448 } 449 450 static void rwsem_ABBA3(void) 451 { 452 WSL(X1); 453 ML(Y1); 454 MU(Y1); 455 WSU(X1); 456 457 ML(Y1); 458 WSL(X1); 459 WSU(X1); 460 MU(Y1); // should fail 461 } 462 463 /* 464 * ABBA deadlock: 465 */ 466 467 #define E() \ 468 \ 469 LOCK_UNLOCK_2(A, B); \ 470 LOCK_UNLOCK_2(B, A); /* fail */ 471 472 /* 473 * 6 testcases: 474 */ 475 #include "locking-selftest-spin.h" 476 GENERATE_TESTCASE(ABBA_spin) 477 #include "locking-selftest-wlock.h" 478 GENERATE_TESTCASE(ABBA_wlock) 479 #include "locking-selftest-rlock.h" 480 GENERATE_TESTCASE(ABBA_rlock) 481 #include "locking-selftest-mutex.h" 482 GENERATE_TESTCASE(ABBA_mutex) 483 #include "locking-selftest-wsem.h" 484 GENERATE_TESTCASE(ABBA_wsem) 485 #include "locking-selftest-rsem.h" 486 GENERATE_TESTCASE(ABBA_rsem) 487 488 #ifdef CONFIG_RT_MUTEXES 489 #include "locking-selftest-rtmutex.h" 490 GENERATE_TESTCASE(ABBA_rtmutex); 491 #endif 492 493 #undef E 494 495 /* 496 * AB BC CA deadlock: 497 */ 498 499 #define E() \ 500 \ 501 LOCK_UNLOCK_2(A, B); \ 502 LOCK_UNLOCK_2(B, C); \ 503 LOCK_UNLOCK_2(C, A); /* fail */ 504 505 /* 506 * 6 testcases: 507 */ 508 #include "locking-selftest-spin.h" 509 GENERATE_TESTCASE(ABBCCA_spin) 510 #include "locking-selftest-wlock.h" 511 GENERATE_TESTCASE(ABBCCA_wlock) 512 #include "locking-selftest-rlock.h" 513 GENERATE_TESTCASE(ABBCCA_rlock) 514 #include "locking-selftest-mutex.h" 515 GENERATE_TESTCASE(ABBCCA_mutex) 516 #include "locking-selftest-wsem.h" 517 GENERATE_TESTCASE(ABBCCA_wsem) 518 #include "locking-selftest-rsem.h" 519 GENERATE_TESTCASE(ABBCCA_rsem) 520 521 #ifdef CONFIG_RT_MUTEXES 522 #include "locking-selftest-rtmutex.h" 523 GENERATE_TESTCASE(ABBCCA_rtmutex); 524 #endif 525 526 #undef E 527 528 /* 529 * AB CA BC deadlock: 530 */ 531 532 #define E() \ 533 \ 534 LOCK_UNLOCK_2(A, B); \ 535 LOCK_UNLOCK_2(C, A); \ 536 LOCK_UNLOCK_2(B, C); /* fail */ 537 538 /* 539 * 6 testcases: 540 */ 541 #include "locking-selftest-spin.h" 542 GENERATE_TESTCASE(ABCABC_spin) 543 #include "locking-selftest-wlock.h" 544 GENERATE_TESTCASE(ABCABC_wlock) 545 #include "locking-selftest-rlock.h" 546 GENERATE_TESTCASE(ABCABC_rlock) 547 #include "locking-selftest-mutex.h" 548 GENERATE_TESTCASE(ABCABC_mutex) 549 #include "locking-selftest-wsem.h" 550 GENERATE_TESTCASE(ABCABC_wsem) 551 #include "locking-selftest-rsem.h" 552 GENERATE_TESTCASE(ABCABC_rsem) 553 554 #ifdef CONFIG_RT_MUTEXES 555 #include "locking-selftest-rtmutex.h" 556 GENERATE_TESTCASE(ABCABC_rtmutex); 557 #endif 558 559 #undef E 560 561 /* 562 * AB BC CD DA deadlock: 563 */ 564 565 #define E() \ 566 \ 567 LOCK_UNLOCK_2(A, B); \ 568 LOCK_UNLOCK_2(B, C); \ 569 LOCK_UNLOCK_2(C, D); \ 570 LOCK_UNLOCK_2(D, A); /* fail */ 571 572 /* 573 * 6 testcases: 574 */ 575 #include "locking-selftest-spin.h" 576 GENERATE_TESTCASE(ABBCCDDA_spin) 577 #include "locking-selftest-wlock.h" 578 GENERATE_TESTCASE(ABBCCDDA_wlock) 579 #include "locking-selftest-rlock.h" 580 GENERATE_TESTCASE(ABBCCDDA_rlock) 581 #include "locking-selftest-mutex.h" 582 GENERATE_TESTCASE(ABBCCDDA_mutex) 583 #include "locking-selftest-wsem.h" 584 GENERATE_TESTCASE(ABBCCDDA_wsem) 585 #include "locking-selftest-rsem.h" 586 GENERATE_TESTCASE(ABBCCDDA_rsem) 587 588 #ifdef CONFIG_RT_MUTEXES 589 #include "locking-selftest-rtmutex.h" 590 GENERATE_TESTCASE(ABBCCDDA_rtmutex); 591 #endif 592 593 #undef E 594 595 /* 596 * AB CD BD DA deadlock: 597 */ 598 #define E() \ 599 \ 600 LOCK_UNLOCK_2(A, B); \ 601 LOCK_UNLOCK_2(C, D); \ 602 LOCK_UNLOCK_2(B, D); \ 603 LOCK_UNLOCK_2(D, A); /* fail */ 604 605 /* 606 * 6 testcases: 607 */ 608 #include "locking-selftest-spin.h" 609 GENERATE_TESTCASE(ABCDBDDA_spin) 610 #include "locking-selftest-wlock.h" 611 GENERATE_TESTCASE(ABCDBDDA_wlock) 612 #include "locking-selftest-rlock.h" 613 GENERATE_TESTCASE(ABCDBDDA_rlock) 614 #include "locking-selftest-mutex.h" 615 GENERATE_TESTCASE(ABCDBDDA_mutex) 616 #include "locking-selftest-wsem.h" 617 GENERATE_TESTCASE(ABCDBDDA_wsem) 618 #include "locking-selftest-rsem.h" 619 GENERATE_TESTCASE(ABCDBDDA_rsem) 620 621 #ifdef CONFIG_RT_MUTEXES 622 #include "locking-selftest-rtmutex.h" 623 GENERATE_TESTCASE(ABCDBDDA_rtmutex); 624 #endif 625 626 #undef E 627 628 /* 629 * AB CD BC DA deadlock: 630 */ 631 #define E() \ 632 \ 633 LOCK_UNLOCK_2(A, B); \ 634 LOCK_UNLOCK_2(C, D); \ 635 LOCK_UNLOCK_2(B, C); \ 636 LOCK_UNLOCK_2(D, A); /* fail */ 637 638 /* 639 * 6 testcases: 640 */ 641 #include "locking-selftest-spin.h" 642 GENERATE_TESTCASE(ABCDBCDA_spin) 643 #include "locking-selftest-wlock.h" 644 GENERATE_TESTCASE(ABCDBCDA_wlock) 645 #include "locking-selftest-rlock.h" 646 GENERATE_TESTCASE(ABCDBCDA_rlock) 647 #include "locking-selftest-mutex.h" 648 GENERATE_TESTCASE(ABCDBCDA_mutex) 649 #include "locking-selftest-wsem.h" 650 GENERATE_TESTCASE(ABCDBCDA_wsem) 651 #include "locking-selftest-rsem.h" 652 GENERATE_TESTCASE(ABCDBCDA_rsem) 653 654 #ifdef CONFIG_RT_MUTEXES 655 #include "locking-selftest-rtmutex.h" 656 GENERATE_TESTCASE(ABCDBCDA_rtmutex); 657 #endif 658 659 #undef E 660 661 /* 662 * Double unlock: 663 */ 664 #define E() \ 665 \ 666 LOCK(A); \ 667 UNLOCK(A); \ 668 UNLOCK(A); /* fail */ 669 670 /* 671 * 6 testcases: 672 */ 673 #include "locking-selftest-spin.h" 674 GENERATE_TESTCASE(double_unlock_spin) 675 #include "locking-selftest-wlock.h" 676 GENERATE_TESTCASE(double_unlock_wlock) 677 #include "locking-selftest-rlock.h" 678 GENERATE_TESTCASE(double_unlock_rlock) 679 #include "locking-selftest-mutex.h" 680 GENERATE_TESTCASE(double_unlock_mutex) 681 #include "locking-selftest-wsem.h" 682 GENERATE_TESTCASE(double_unlock_wsem) 683 #include "locking-selftest-rsem.h" 684 GENERATE_TESTCASE(double_unlock_rsem) 685 686 #ifdef CONFIG_RT_MUTEXES 687 #include "locking-selftest-rtmutex.h" 688 GENERATE_TESTCASE(double_unlock_rtmutex); 689 #endif 690 691 #undef E 692 693 /* 694 * initializing a held lock: 695 */ 696 #define E() \ 697 \ 698 LOCK(A); \ 699 INIT(A); /* fail */ 700 701 /* 702 * 6 testcases: 703 */ 704 #include "locking-selftest-spin.h" 705 GENERATE_TESTCASE(init_held_spin) 706 #include "locking-selftest-wlock.h" 707 GENERATE_TESTCASE(init_held_wlock) 708 #include "locking-selftest-rlock.h" 709 GENERATE_TESTCASE(init_held_rlock) 710 #include "locking-selftest-mutex.h" 711 GENERATE_TESTCASE(init_held_mutex) 712 #include "locking-selftest-wsem.h" 713 GENERATE_TESTCASE(init_held_wsem) 714 #include "locking-selftest-rsem.h" 715 GENERATE_TESTCASE(init_held_rsem) 716 717 #ifdef CONFIG_RT_MUTEXES 718 #include "locking-selftest-rtmutex.h" 719 GENERATE_TESTCASE(init_held_rtmutex); 720 #endif 721 722 #undef E 723 724 /* 725 * locking an irq-safe lock with irqs enabled: 726 */ 727 #define E1() \ 728 \ 729 IRQ_ENTER(); \ 730 LOCK(A); \ 731 UNLOCK(A); \ 732 IRQ_EXIT(); 733 734 #define E2() \ 735 \ 736 LOCK(A); \ 737 UNLOCK(A); 738 739 /* 740 * Generate 24 testcases: 741 */ 742 #include "locking-selftest-spin-hardirq.h" 743 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin) 744 745 #include "locking-selftest-rlock-hardirq.h" 746 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock) 747 748 #include "locking-selftest-wlock-hardirq.h" 749 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock) 750 751 #include "locking-selftest-spin-softirq.h" 752 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin) 753 754 #include "locking-selftest-rlock-softirq.h" 755 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock) 756 757 #include "locking-selftest-wlock-softirq.h" 758 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock) 759 760 #undef E1 761 #undef E2 762 763 /* 764 * Enabling hardirqs with a softirq-safe lock held: 765 */ 766 #define E1() \ 767 \ 768 SOFTIRQ_ENTER(); \ 769 LOCK(A); \ 770 UNLOCK(A); \ 771 SOFTIRQ_EXIT(); 772 773 #define E2() \ 774 \ 775 HARDIRQ_DISABLE(); \ 776 LOCK(A); \ 777 HARDIRQ_ENABLE(); \ 778 UNLOCK(A); 779 780 /* 781 * Generate 12 testcases: 782 */ 783 #include "locking-selftest-spin.h" 784 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin) 785 786 #include "locking-selftest-wlock.h" 787 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock) 788 789 #include "locking-selftest-rlock.h" 790 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock) 791 792 #undef E1 793 #undef E2 794 795 /* 796 * Enabling irqs with an irq-safe lock held: 797 */ 798 #define E1() \ 799 \ 800 IRQ_ENTER(); \ 801 LOCK(A); \ 802 UNLOCK(A); \ 803 IRQ_EXIT(); 804 805 #define E2() \ 806 \ 807 IRQ_DISABLE(); \ 808 LOCK(A); \ 809 IRQ_ENABLE(); \ 810 UNLOCK(A); 811 812 /* 813 * Generate 24 testcases: 814 */ 815 #include "locking-selftest-spin-hardirq.h" 816 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin) 817 818 #include "locking-selftest-rlock-hardirq.h" 819 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock) 820 821 #include "locking-selftest-wlock-hardirq.h" 822 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock) 823 824 #include "locking-selftest-spin-softirq.h" 825 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin) 826 827 #include "locking-selftest-rlock-softirq.h" 828 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock) 829 830 #include "locking-selftest-wlock-softirq.h" 831 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock) 832 833 #undef E1 834 #undef E2 835 836 /* 837 * Acquiring a irq-unsafe lock while holding an irq-safe-lock: 838 */ 839 #define E1() \ 840 \ 841 LOCK(A); \ 842 LOCK(B); \ 843 UNLOCK(B); \ 844 UNLOCK(A); \ 845 846 #define E2() \ 847 \ 848 LOCK(B); \ 849 UNLOCK(B); 850 851 #define E3() \ 852 \ 853 IRQ_ENTER(); \ 854 LOCK(A); \ 855 UNLOCK(A); \ 856 IRQ_EXIT(); 857 858 /* 859 * Generate 36 testcases: 860 */ 861 #include "locking-selftest-spin-hardirq.h" 862 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin) 863 864 #include "locking-selftest-rlock-hardirq.h" 865 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock) 866 867 #include "locking-selftest-wlock-hardirq.h" 868 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock) 869 870 #include "locking-selftest-spin-softirq.h" 871 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin) 872 873 #include "locking-selftest-rlock-softirq.h" 874 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock) 875 876 #include "locking-selftest-wlock-softirq.h" 877 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock) 878 879 #undef E1 880 #undef E2 881 #undef E3 882 883 /* 884 * If a lock turns into softirq-safe, but earlier it took 885 * a softirq-unsafe lock: 886 */ 887 888 #define E1() \ 889 IRQ_DISABLE(); \ 890 LOCK(A); \ 891 LOCK(B); \ 892 UNLOCK(B); \ 893 UNLOCK(A); \ 894 IRQ_ENABLE(); 895 896 #define E2() \ 897 LOCK(B); \ 898 UNLOCK(B); 899 900 #define E3() \ 901 IRQ_ENTER(); \ 902 LOCK(A); \ 903 UNLOCK(A); \ 904 IRQ_EXIT(); 905 906 /* 907 * Generate 36 testcases: 908 */ 909 #include "locking-selftest-spin-hardirq.h" 910 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin) 911 912 #include "locking-selftest-rlock-hardirq.h" 913 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock) 914 915 #include "locking-selftest-wlock-hardirq.h" 916 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock) 917 918 #include "locking-selftest-spin-softirq.h" 919 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin) 920 921 #include "locking-selftest-rlock-softirq.h" 922 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock) 923 924 #include "locking-selftest-wlock-softirq.h" 925 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock) 926 927 #undef E1 928 #undef E2 929 #undef E3 930 931 /* 932 * read-lock / write-lock irq inversion. 933 * 934 * Deadlock scenario: 935 * 936 * CPU#1 is at #1, i.e. it has write-locked A, but has not 937 * taken B yet. 938 * 939 * CPU#2 is at #2, i.e. it has locked B. 940 * 941 * Hardirq hits CPU#2 at point #2 and is trying to read-lock A. 942 * 943 * The deadlock occurs because CPU#1 will spin on B, and CPU#2 944 * will spin on A. 945 */ 946 947 #define E1() \ 948 \ 949 IRQ_DISABLE(); \ 950 WL(A); \ 951 LOCK(B); \ 952 UNLOCK(B); \ 953 WU(A); \ 954 IRQ_ENABLE(); 955 956 #define E2() \ 957 \ 958 LOCK(B); \ 959 UNLOCK(B); 960 961 #define E3() \ 962 \ 963 IRQ_ENTER(); \ 964 RL(A); \ 965 RU(A); \ 966 IRQ_EXIT(); 967 968 /* 969 * Generate 36 testcases: 970 */ 971 #include "locking-selftest-spin-hardirq.h" 972 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin) 973 974 #include "locking-selftest-rlock-hardirq.h" 975 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock) 976 977 #include "locking-selftest-wlock-hardirq.h" 978 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock) 979 980 #include "locking-selftest-spin-softirq.h" 981 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin) 982 983 #include "locking-selftest-rlock-softirq.h" 984 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock) 985 986 #include "locking-selftest-wlock-softirq.h" 987 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock) 988 989 #undef E1 990 #undef E2 991 #undef E3 992 993 /* 994 * read-lock / write-lock recursion that is actually safe. 995 */ 996 997 #define E1() \ 998 \ 999 IRQ_DISABLE(); \ 1000 WL(A); \ 1001 WU(A); \ 1002 IRQ_ENABLE(); 1003 1004 #define E2() \ 1005 \ 1006 RL(A); \ 1007 RU(A); \ 1008 1009 #define E3() \ 1010 \ 1011 IRQ_ENTER(); \ 1012 RL(A); \ 1013 L(B); \ 1014 U(B); \ 1015 RU(A); \ 1016 IRQ_EXIT(); 1017 1018 /* 1019 * Generate 12 testcases: 1020 */ 1021 #include "locking-selftest-hardirq.h" 1022 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard) 1023 1024 #include "locking-selftest-softirq.h" 1025 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft) 1026 1027 #undef E1 1028 #undef E2 1029 #undef E3 1030 1031 /* 1032 * read-lock / write-lock recursion that is unsafe. 1033 */ 1034 1035 #define E1() \ 1036 \ 1037 IRQ_DISABLE(); \ 1038 L(B); \ 1039 WL(A); \ 1040 WU(A); \ 1041 U(B); \ 1042 IRQ_ENABLE(); 1043 1044 #define E2() \ 1045 \ 1046 RL(A); \ 1047 RU(A); \ 1048 1049 #define E3() \ 1050 \ 1051 IRQ_ENTER(); \ 1052 L(B); \ 1053 U(B); \ 1054 IRQ_EXIT(); 1055 1056 /* 1057 * Generate 12 testcases: 1058 */ 1059 #include "locking-selftest-hardirq.h" 1060 // GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard) 1061 1062 #include "locking-selftest-softirq.h" 1063 // GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft) 1064 1065 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1066 # define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map) 1067 # define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map) 1068 # define I_MUTEX(x) lockdep_reset_lock(&mutex_##x.dep_map) 1069 # define I_RWSEM(x) lockdep_reset_lock(&rwsem_##x.dep_map) 1070 # define I_WW(x) lockdep_reset_lock(&x.dep_map) 1071 #ifdef CONFIG_RT_MUTEXES 1072 # define I_RTMUTEX(x) lockdep_reset_lock(&rtmutex_##x.dep_map) 1073 #endif 1074 #else 1075 # define I_SPINLOCK(x) 1076 # define I_RWLOCK(x) 1077 # define I_MUTEX(x) 1078 # define I_RWSEM(x) 1079 # define I_WW(x) 1080 #endif 1081 1082 #ifndef I_RTMUTEX 1083 # define I_RTMUTEX(x) 1084 #endif 1085 1086 #ifdef CONFIG_RT_MUTEXES 1087 #define I2_RTMUTEX(x) rt_mutex_init(&rtmutex_##x) 1088 #else 1089 #define I2_RTMUTEX(x) 1090 #endif 1091 1092 #define I1(x) \ 1093 do { \ 1094 I_SPINLOCK(x); \ 1095 I_RWLOCK(x); \ 1096 I_MUTEX(x); \ 1097 I_RWSEM(x); \ 1098 I_RTMUTEX(x); \ 1099 } while (0) 1100 1101 #define I2(x) \ 1102 do { \ 1103 raw_spin_lock_init(&lock_##x); \ 1104 rwlock_init(&rwlock_##x); \ 1105 mutex_init(&mutex_##x); \ 1106 init_rwsem(&rwsem_##x); \ 1107 I2_RTMUTEX(x); \ 1108 } while (0) 1109 1110 static void reset_locks(void) 1111 { 1112 local_irq_disable(); 1113 lockdep_free_key_range(&ww_lockdep.acquire_key, 1); 1114 lockdep_free_key_range(&ww_lockdep.mutex_key, 1); 1115 1116 I1(A); I1(B); I1(C); I1(D); 1117 I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2); 1118 I_WW(t); I_WW(t2); I_WW(o.base); I_WW(o2.base); I_WW(o3.base); 1119 lockdep_reset(); 1120 I2(A); I2(B); I2(C); I2(D); 1121 init_shared_classes(); 1122 1123 ww_mutex_init(&o, &ww_lockdep); ww_mutex_init(&o2, &ww_lockdep); ww_mutex_init(&o3, &ww_lockdep); 1124 memset(&t, 0, sizeof(t)); memset(&t2, 0, sizeof(t2)); 1125 memset(&ww_lockdep.acquire_key, 0, sizeof(ww_lockdep.acquire_key)); 1126 memset(&ww_lockdep.mutex_key, 0, sizeof(ww_lockdep.mutex_key)); 1127 local_irq_enable(); 1128 } 1129 1130 #undef I 1131 1132 static int testcase_total; 1133 static int testcase_successes; 1134 static int expected_testcase_failures; 1135 static int unexpected_testcase_failures; 1136 1137 static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask) 1138 { 1139 unsigned long saved_preempt_count = preempt_count(); 1140 1141 WARN_ON(irqs_disabled()); 1142 1143 testcase_fn(); 1144 /* 1145 * Filter out expected failures: 1146 */ 1147 #ifndef CONFIG_PROVE_LOCKING 1148 if (expected == FAILURE && debug_locks) { 1149 expected_testcase_failures++; 1150 pr_cont("failed|"); 1151 } 1152 else 1153 #endif 1154 if (debug_locks != expected) { 1155 unexpected_testcase_failures++; 1156 pr_cont("FAILED|"); 1157 } else { 1158 testcase_successes++; 1159 pr_cont(" ok |"); 1160 } 1161 testcase_total++; 1162 1163 if (debug_locks_verbose) 1164 pr_cont(" lockclass mask: %x, debug_locks: %d, expected: %d\n", 1165 lockclass_mask, debug_locks, expected); 1166 /* 1167 * Some tests (e.g. double-unlock) might corrupt the preemption 1168 * count, so restore it: 1169 */ 1170 preempt_count_set(saved_preempt_count); 1171 #ifdef CONFIG_TRACE_IRQFLAGS 1172 if (softirq_count()) 1173 current->softirqs_enabled = 0; 1174 else 1175 current->softirqs_enabled = 1; 1176 #endif 1177 1178 reset_locks(); 1179 } 1180 1181 #ifdef CONFIG_RT_MUTEXES 1182 #define dotest_rt(fn, e, m) dotest((fn), (e), (m)) 1183 #else 1184 #define dotest_rt(fn, e, m) 1185 #endif 1186 1187 static inline void print_testname(const char *testname) 1188 { 1189 printk("%33s:", testname); 1190 } 1191 1192 #define DO_TESTCASE_1(desc, name, nr) \ 1193 print_testname(desc"/"#nr); \ 1194 dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ 1195 pr_cont("\n"); 1196 1197 #define DO_TESTCASE_1B(desc, name, nr) \ 1198 print_testname(desc"/"#nr); \ 1199 dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \ 1200 pr_cont("\n"); 1201 1202 #define DO_TESTCASE_3(desc, name, nr) \ 1203 print_testname(desc"/"#nr); \ 1204 dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \ 1205 dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ 1206 dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ 1207 pr_cont("\n"); 1208 1209 #define DO_TESTCASE_3RW(desc, name, nr) \ 1210 print_testname(desc"/"#nr); \ 1211 dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\ 1212 dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ 1213 dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ 1214 pr_cont("\n"); 1215 1216 #define DO_TESTCASE_6(desc, name) \ 1217 print_testname(desc); \ 1218 dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ 1219 dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ 1220 dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK); \ 1221 dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ 1222 dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ 1223 dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ 1224 dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \ 1225 pr_cont("\n"); 1226 1227 #define DO_TESTCASE_6_SUCCESS(desc, name) \ 1228 print_testname(desc); \ 1229 dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN); \ 1230 dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK); \ 1231 dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ 1232 dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX); \ 1233 dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM); \ 1234 dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM); \ 1235 dotest_rt(name##_rtmutex, SUCCESS, LOCKTYPE_RTMUTEX); \ 1236 pr_cont("\n"); 1237 1238 /* 1239 * 'read' variant: rlocks must not trigger. 1240 */ 1241 #define DO_TESTCASE_6R(desc, name) \ 1242 print_testname(desc); \ 1243 dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ 1244 dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ 1245 dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ 1246 dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ 1247 dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ 1248 dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ 1249 dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \ 1250 pr_cont("\n"); 1251 1252 #define DO_TESTCASE_2I(desc, name, nr) \ 1253 DO_TESTCASE_1("hard-"desc, name##_hard, nr); \ 1254 DO_TESTCASE_1("soft-"desc, name##_soft, nr); 1255 1256 #define DO_TESTCASE_2IB(desc, name, nr) \ 1257 DO_TESTCASE_1B("hard-"desc, name##_hard, nr); \ 1258 DO_TESTCASE_1B("soft-"desc, name##_soft, nr); 1259 1260 #define DO_TESTCASE_6I(desc, name, nr) \ 1261 DO_TESTCASE_3("hard-"desc, name##_hard, nr); \ 1262 DO_TESTCASE_3("soft-"desc, name##_soft, nr); 1263 1264 #define DO_TESTCASE_6IRW(desc, name, nr) \ 1265 DO_TESTCASE_3RW("hard-"desc, name##_hard, nr); \ 1266 DO_TESTCASE_3RW("soft-"desc, name##_soft, nr); 1267 1268 #define DO_TESTCASE_2x3(desc, name) \ 1269 DO_TESTCASE_3(desc, name, 12); \ 1270 DO_TESTCASE_3(desc, name, 21); 1271 1272 #define DO_TESTCASE_2x6(desc, name) \ 1273 DO_TESTCASE_6I(desc, name, 12); \ 1274 DO_TESTCASE_6I(desc, name, 21); 1275 1276 #define DO_TESTCASE_6x2(desc, name) \ 1277 DO_TESTCASE_2I(desc, name, 123); \ 1278 DO_TESTCASE_2I(desc, name, 132); \ 1279 DO_TESTCASE_2I(desc, name, 213); \ 1280 DO_TESTCASE_2I(desc, name, 231); \ 1281 DO_TESTCASE_2I(desc, name, 312); \ 1282 DO_TESTCASE_2I(desc, name, 321); 1283 1284 #define DO_TESTCASE_6x2B(desc, name) \ 1285 DO_TESTCASE_2IB(desc, name, 123); \ 1286 DO_TESTCASE_2IB(desc, name, 132); \ 1287 DO_TESTCASE_2IB(desc, name, 213); \ 1288 DO_TESTCASE_2IB(desc, name, 231); \ 1289 DO_TESTCASE_2IB(desc, name, 312); \ 1290 DO_TESTCASE_2IB(desc, name, 321); 1291 1292 #define DO_TESTCASE_6x6(desc, name) \ 1293 DO_TESTCASE_6I(desc, name, 123); \ 1294 DO_TESTCASE_6I(desc, name, 132); \ 1295 DO_TESTCASE_6I(desc, name, 213); \ 1296 DO_TESTCASE_6I(desc, name, 231); \ 1297 DO_TESTCASE_6I(desc, name, 312); \ 1298 DO_TESTCASE_6I(desc, name, 321); 1299 1300 #define DO_TESTCASE_6x6RW(desc, name) \ 1301 DO_TESTCASE_6IRW(desc, name, 123); \ 1302 DO_TESTCASE_6IRW(desc, name, 132); \ 1303 DO_TESTCASE_6IRW(desc, name, 213); \ 1304 DO_TESTCASE_6IRW(desc, name, 231); \ 1305 DO_TESTCASE_6IRW(desc, name, 312); \ 1306 DO_TESTCASE_6IRW(desc, name, 321); 1307 1308 static void ww_test_fail_acquire(void) 1309 { 1310 int ret; 1311 1312 WWAI(&t); 1313 t.stamp++; 1314 1315 ret = WWL(&o, &t); 1316 1317 if (WARN_ON(!o.ctx) || 1318 WARN_ON(ret)) 1319 return; 1320 1321 /* No lockdep test, pure API */ 1322 ret = WWL(&o, &t); 1323 WARN_ON(ret != -EALREADY); 1324 1325 ret = WWT(&o); 1326 WARN_ON(ret); 1327 1328 t2 = t; 1329 t2.stamp++; 1330 ret = WWL(&o, &t2); 1331 WARN_ON(ret != -EDEADLK); 1332 WWU(&o); 1333 1334 if (WWT(&o)) 1335 WWU(&o); 1336 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1337 else 1338 DEBUG_LOCKS_WARN_ON(1); 1339 #endif 1340 } 1341 1342 static void ww_test_normal(void) 1343 { 1344 int ret; 1345 1346 WWAI(&t); 1347 1348 /* 1349 * None of the ww_mutex codepaths should be taken in the 'normal' 1350 * mutex calls. The easiest way to verify this is by using the 1351 * normal mutex calls, and making sure o.ctx is unmodified. 1352 */ 1353 1354 /* mutex_lock (and indirectly, mutex_lock_nested) */ 1355 o.ctx = (void *)~0UL; 1356 mutex_lock(&o.base); 1357 mutex_unlock(&o.base); 1358 WARN_ON(o.ctx != (void *)~0UL); 1359 1360 /* mutex_lock_interruptible (and *_nested) */ 1361 o.ctx = (void *)~0UL; 1362 ret = mutex_lock_interruptible(&o.base); 1363 if (!ret) 1364 mutex_unlock(&o.base); 1365 else 1366 WARN_ON(1); 1367 WARN_ON(o.ctx != (void *)~0UL); 1368 1369 /* mutex_lock_killable (and *_nested) */ 1370 o.ctx = (void *)~0UL; 1371 ret = mutex_lock_killable(&o.base); 1372 if (!ret) 1373 mutex_unlock(&o.base); 1374 else 1375 WARN_ON(1); 1376 WARN_ON(o.ctx != (void *)~0UL); 1377 1378 /* trylock, succeeding */ 1379 o.ctx = (void *)~0UL; 1380 ret = mutex_trylock(&o.base); 1381 WARN_ON(!ret); 1382 if (ret) 1383 mutex_unlock(&o.base); 1384 else 1385 WARN_ON(1); 1386 WARN_ON(o.ctx != (void *)~0UL); 1387 1388 /* trylock, failing */ 1389 o.ctx = (void *)~0UL; 1390 mutex_lock(&o.base); 1391 ret = mutex_trylock(&o.base); 1392 WARN_ON(ret); 1393 mutex_unlock(&o.base); 1394 WARN_ON(o.ctx != (void *)~0UL); 1395 1396 /* nest_lock */ 1397 o.ctx = (void *)~0UL; 1398 mutex_lock_nest_lock(&o.base, &t); 1399 mutex_unlock(&o.base); 1400 WARN_ON(o.ctx != (void *)~0UL); 1401 } 1402 1403 static void ww_test_two_contexts(void) 1404 { 1405 WWAI(&t); 1406 WWAI(&t2); 1407 } 1408 1409 static void ww_test_diff_class(void) 1410 { 1411 WWAI(&t); 1412 #ifdef CONFIG_DEBUG_MUTEXES 1413 t.ww_class = NULL; 1414 #endif 1415 WWL(&o, &t); 1416 } 1417 1418 static void ww_test_context_done_twice(void) 1419 { 1420 WWAI(&t); 1421 WWAD(&t); 1422 WWAD(&t); 1423 WWAF(&t); 1424 } 1425 1426 static void ww_test_context_unlock_twice(void) 1427 { 1428 WWAI(&t); 1429 WWAD(&t); 1430 WWAF(&t); 1431 WWAF(&t); 1432 } 1433 1434 static void ww_test_context_fini_early(void) 1435 { 1436 WWAI(&t); 1437 WWL(&o, &t); 1438 WWAD(&t); 1439 WWAF(&t); 1440 } 1441 1442 static void ww_test_context_lock_after_done(void) 1443 { 1444 WWAI(&t); 1445 WWAD(&t); 1446 WWL(&o, &t); 1447 } 1448 1449 static void ww_test_object_unlock_twice(void) 1450 { 1451 WWL1(&o); 1452 WWU(&o); 1453 WWU(&o); 1454 } 1455 1456 static void ww_test_object_lock_unbalanced(void) 1457 { 1458 WWAI(&t); 1459 WWL(&o, &t); 1460 t.acquired = 0; 1461 WWU(&o); 1462 WWAF(&t); 1463 } 1464 1465 static void ww_test_object_lock_stale_context(void) 1466 { 1467 WWAI(&t); 1468 o.ctx = &t2; 1469 WWL(&o, &t); 1470 } 1471 1472 static void ww_test_edeadlk_normal(void) 1473 { 1474 int ret; 1475 1476 mutex_lock(&o2.base); 1477 o2.ctx = &t2; 1478 mutex_release(&o2.base.dep_map, _THIS_IP_); 1479 1480 WWAI(&t); 1481 t2 = t; 1482 t2.stamp--; 1483 1484 ret = WWL(&o, &t); 1485 WARN_ON(ret); 1486 1487 ret = WWL(&o2, &t); 1488 WARN_ON(ret != -EDEADLK); 1489 1490 o2.ctx = NULL; 1491 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); 1492 mutex_unlock(&o2.base); 1493 WWU(&o); 1494 1495 WWL(&o2, &t); 1496 } 1497 1498 static void ww_test_edeadlk_normal_slow(void) 1499 { 1500 int ret; 1501 1502 mutex_lock(&o2.base); 1503 mutex_release(&o2.base.dep_map, _THIS_IP_); 1504 o2.ctx = &t2; 1505 1506 WWAI(&t); 1507 t2 = t; 1508 t2.stamp--; 1509 1510 ret = WWL(&o, &t); 1511 WARN_ON(ret); 1512 1513 ret = WWL(&o2, &t); 1514 WARN_ON(ret != -EDEADLK); 1515 1516 o2.ctx = NULL; 1517 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); 1518 mutex_unlock(&o2.base); 1519 WWU(&o); 1520 1521 ww_mutex_lock_slow(&o2, &t); 1522 } 1523 1524 static void ww_test_edeadlk_no_unlock(void) 1525 { 1526 int ret; 1527 1528 mutex_lock(&o2.base); 1529 o2.ctx = &t2; 1530 mutex_release(&o2.base.dep_map, _THIS_IP_); 1531 1532 WWAI(&t); 1533 t2 = t; 1534 t2.stamp--; 1535 1536 ret = WWL(&o, &t); 1537 WARN_ON(ret); 1538 1539 ret = WWL(&o2, &t); 1540 WARN_ON(ret != -EDEADLK); 1541 1542 o2.ctx = NULL; 1543 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); 1544 mutex_unlock(&o2.base); 1545 1546 WWL(&o2, &t); 1547 } 1548 1549 static void ww_test_edeadlk_no_unlock_slow(void) 1550 { 1551 int ret; 1552 1553 mutex_lock(&o2.base); 1554 mutex_release(&o2.base.dep_map, _THIS_IP_); 1555 o2.ctx = &t2; 1556 1557 WWAI(&t); 1558 t2 = t; 1559 t2.stamp--; 1560 1561 ret = WWL(&o, &t); 1562 WARN_ON(ret); 1563 1564 ret = WWL(&o2, &t); 1565 WARN_ON(ret != -EDEADLK); 1566 1567 o2.ctx = NULL; 1568 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); 1569 mutex_unlock(&o2.base); 1570 1571 ww_mutex_lock_slow(&o2, &t); 1572 } 1573 1574 static void ww_test_edeadlk_acquire_more(void) 1575 { 1576 int ret; 1577 1578 mutex_lock(&o2.base); 1579 mutex_release(&o2.base.dep_map, _THIS_IP_); 1580 o2.ctx = &t2; 1581 1582 WWAI(&t); 1583 t2 = t; 1584 t2.stamp--; 1585 1586 ret = WWL(&o, &t); 1587 WARN_ON(ret); 1588 1589 ret = WWL(&o2, &t); 1590 WARN_ON(ret != -EDEADLK); 1591 1592 ret = WWL(&o3, &t); 1593 } 1594 1595 static void ww_test_edeadlk_acquire_more_slow(void) 1596 { 1597 int ret; 1598 1599 mutex_lock(&o2.base); 1600 mutex_release(&o2.base.dep_map, _THIS_IP_); 1601 o2.ctx = &t2; 1602 1603 WWAI(&t); 1604 t2 = t; 1605 t2.stamp--; 1606 1607 ret = WWL(&o, &t); 1608 WARN_ON(ret); 1609 1610 ret = WWL(&o2, &t); 1611 WARN_ON(ret != -EDEADLK); 1612 1613 ww_mutex_lock_slow(&o3, &t); 1614 } 1615 1616 static void ww_test_edeadlk_acquire_more_edeadlk(void) 1617 { 1618 int ret; 1619 1620 mutex_lock(&o2.base); 1621 mutex_release(&o2.base.dep_map, _THIS_IP_); 1622 o2.ctx = &t2; 1623 1624 mutex_lock(&o3.base); 1625 mutex_release(&o3.base.dep_map, _THIS_IP_); 1626 o3.ctx = &t2; 1627 1628 WWAI(&t); 1629 t2 = t; 1630 t2.stamp--; 1631 1632 ret = WWL(&o, &t); 1633 WARN_ON(ret); 1634 1635 ret = WWL(&o2, &t); 1636 WARN_ON(ret != -EDEADLK); 1637 1638 ret = WWL(&o3, &t); 1639 WARN_ON(ret != -EDEADLK); 1640 } 1641 1642 static void ww_test_edeadlk_acquire_more_edeadlk_slow(void) 1643 { 1644 int ret; 1645 1646 mutex_lock(&o2.base); 1647 mutex_release(&o2.base.dep_map, _THIS_IP_); 1648 o2.ctx = &t2; 1649 1650 mutex_lock(&o3.base); 1651 mutex_release(&o3.base.dep_map, _THIS_IP_); 1652 o3.ctx = &t2; 1653 1654 WWAI(&t); 1655 t2 = t; 1656 t2.stamp--; 1657 1658 ret = WWL(&o, &t); 1659 WARN_ON(ret); 1660 1661 ret = WWL(&o2, &t); 1662 WARN_ON(ret != -EDEADLK); 1663 1664 ww_mutex_lock_slow(&o3, &t); 1665 } 1666 1667 static void ww_test_edeadlk_acquire_wrong(void) 1668 { 1669 int ret; 1670 1671 mutex_lock(&o2.base); 1672 mutex_release(&o2.base.dep_map, _THIS_IP_); 1673 o2.ctx = &t2; 1674 1675 WWAI(&t); 1676 t2 = t; 1677 t2.stamp--; 1678 1679 ret = WWL(&o, &t); 1680 WARN_ON(ret); 1681 1682 ret = WWL(&o2, &t); 1683 WARN_ON(ret != -EDEADLK); 1684 if (!ret) 1685 WWU(&o2); 1686 1687 WWU(&o); 1688 1689 ret = WWL(&o3, &t); 1690 } 1691 1692 static void ww_test_edeadlk_acquire_wrong_slow(void) 1693 { 1694 int ret; 1695 1696 mutex_lock(&o2.base); 1697 mutex_release(&o2.base.dep_map, _THIS_IP_); 1698 o2.ctx = &t2; 1699 1700 WWAI(&t); 1701 t2 = t; 1702 t2.stamp--; 1703 1704 ret = WWL(&o, &t); 1705 WARN_ON(ret); 1706 1707 ret = WWL(&o2, &t); 1708 WARN_ON(ret != -EDEADLK); 1709 if (!ret) 1710 WWU(&o2); 1711 1712 WWU(&o); 1713 1714 ww_mutex_lock_slow(&o3, &t); 1715 } 1716 1717 static void ww_test_spin_nest_unlocked(void) 1718 { 1719 raw_spin_lock_nest_lock(&lock_A, &o.base); 1720 U(A); 1721 } 1722 1723 static void ww_test_unneeded_slow(void) 1724 { 1725 WWAI(&t); 1726 1727 ww_mutex_lock_slow(&o, &t); 1728 } 1729 1730 static void ww_test_context_block(void) 1731 { 1732 int ret; 1733 1734 WWAI(&t); 1735 1736 ret = WWL(&o, &t); 1737 WARN_ON(ret); 1738 WWL1(&o2); 1739 } 1740 1741 static void ww_test_context_try(void) 1742 { 1743 int ret; 1744 1745 WWAI(&t); 1746 1747 ret = WWL(&o, &t); 1748 WARN_ON(ret); 1749 1750 ret = WWT(&o2); 1751 WARN_ON(!ret); 1752 WWU(&o2); 1753 WWU(&o); 1754 } 1755 1756 static void ww_test_context_context(void) 1757 { 1758 int ret; 1759 1760 WWAI(&t); 1761 1762 ret = WWL(&o, &t); 1763 WARN_ON(ret); 1764 1765 ret = WWL(&o2, &t); 1766 WARN_ON(ret); 1767 1768 WWU(&o2); 1769 WWU(&o); 1770 } 1771 1772 static void ww_test_try_block(void) 1773 { 1774 bool ret; 1775 1776 ret = WWT(&o); 1777 WARN_ON(!ret); 1778 1779 WWL1(&o2); 1780 WWU(&o2); 1781 WWU(&o); 1782 } 1783 1784 static void ww_test_try_try(void) 1785 { 1786 bool ret; 1787 1788 ret = WWT(&o); 1789 WARN_ON(!ret); 1790 ret = WWT(&o2); 1791 WARN_ON(!ret); 1792 WWU(&o2); 1793 WWU(&o); 1794 } 1795 1796 static void ww_test_try_context(void) 1797 { 1798 int ret; 1799 1800 ret = WWT(&o); 1801 WARN_ON(!ret); 1802 1803 WWAI(&t); 1804 1805 ret = WWL(&o2, &t); 1806 WARN_ON(ret); 1807 } 1808 1809 static void ww_test_block_block(void) 1810 { 1811 WWL1(&o); 1812 WWL1(&o2); 1813 } 1814 1815 static void ww_test_block_try(void) 1816 { 1817 bool ret; 1818 1819 WWL1(&o); 1820 ret = WWT(&o2); 1821 WARN_ON(!ret); 1822 } 1823 1824 static void ww_test_block_context(void) 1825 { 1826 int ret; 1827 1828 WWL1(&o); 1829 WWAI(&t); 1830 1831 ret = WWL(&o2, &t); 1832 WARN_ON(ret); 1833 } 1834 1835 static void ww_test_spin_block(void) 1836 { 1837 L(A); 1838 U(A); 1839 1840 WWL1(&o); 1841 L(A); 1842 U(A); 1843 WWU(&o); 1844 1845 L(A); 1846 WWL1(&o); 1847 WWU(&o); 1848 U(A); 1849 } 1850 1851 static void ww_test_spin_try(void) 1852 { 1853 bool ret; 1854 1855 L(A); 1856 U(A); 1857 1858 ret = WWT(&o); 1859 WARN_ON(!ret); 1860 L(A); 1861 U(A); 1862 WWU(&o); 1863 1864 L(A); 1865 ret = WWT(&o); 1866 WARN_ON(!ret); 1867 WWU(&o); 1868 U(A); 1869 } 1870 1871 static void ww_test_spin_context(void) 1872 { 1873 int ret; 1874 1875 L(A); 1876 U(A); 1877 1878 WWAI(&t); 1879 1880 ret = WWL(&o, &t); 1881 WARN_ON(ret); 1882 L(A); 1883 U(A); 1884 WWU(&o); 1885 1886 L(A); 1887 ret = WWL(&o, &t); 1888 WARN_ON(ret); 1889 WWU(&o); 1890 U(A); 1891 } 1892 1893 static void ww_tests(void) 1894 { 1895 printk(" --------------------------------------------------------------------------\n"); 1896 printk(" | Wound/wait tests |\n"); 1897 printk(" ---------------------\n"); 1898 1899 print_testname("ww api failures"); 1900 dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW); 1901 dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW); 1902 dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW); 1903 pr_cont("\n"); 1904 1905 print_testname("ww contexts mixing"); 1906 dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW); 1907 dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW); 1908 pr_cont("\n"); 1909 1910 print_testname("finishing ww context"); 1911 dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW); 1912 dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW); 1913 dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW); 1914 dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW); 1915 pr_cont("\n"); 1916 1917 print_testname("locking mismatches"); 1918 dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW); 1919 dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW); 1920 dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW); 1921 pr_cont("\n"); 1922 1923 print_testname("EDEADLK handling"); 1924 dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW); 1925 dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW); 1926 dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW); 1927 dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW); 1928 dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW); 1929 dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW); 1930 dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW); 1931 dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW); 1932 dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW); 1933 dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW); 1934 pr_cont("\n"); 1935 1936 print_testname("spinlock nest unlocked"); 1937 dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW); 1938 pr_cont("\n"); 1939 1940 printk(" -----------------------------------------------------\n"); 1941 printk(" |block | try |context|\n"); 1942 printk(" -----------------------------------------------------\n"); 1943 1944 print_testname("context"); 1945 dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW); 1946 dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW); 1947 dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW); 1948 pr_cont("\n"); 1949 1950 print_testname("try"); 1951 dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW); 1952 dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW); 1953 dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW); 1954 pr_cont("\n"); 1955 1956 print_testname("block"); 1957 dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW); 1958 dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW); 1959 dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW); 1960 pr_cont("\n"); 1961 1962 print_testname("spinlock"); 1963 dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW); 1964 dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW); 1965 dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW); 1966 pr_cont("\n"); 1967 } 1968 1969 void locking_selftest(void) 1970 { 1971 /* 1972 * Got a locking failure before the selftest ran? 1973 */ 1974 if (!debug_locks) { 1975 printk("----------------------------------\n"); 1976 printk("| Locking API testsuite disabled |\n"); 1977 printk("----------------------------------\n"); 1978 return; 1979 } 1980 1981 /* 1982 * Run the testsuite: 1983 */ 1984 printk("------------------------\n"); 1985 printk("| Locking API testsuite:\n"); 1986 printk("----------------------------------------------------------------------------\n"); 1987 printk(" | spin |wlock |rlock |mutex | wsem | rsem |\n"); 1988 printk(" --------------------------------------------------------------------------\n"); 1989 1990 init_shared_classes(); 1991 debug_locks_silent = !debug_locks_verbose; 1992 lockdep_set_selftest_task(current); 1993 1994 DO_TESTCASE_6R("A-A deadlock", AA); 1995 DO_TESTCASE_6R("A-B-B-A deadlock", ABBA); 1996 DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA); 1997 DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC); 1998 DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA); 1999 DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA); 2000 DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA); 2001 DO_TESTCASE_6("double unlock", double_unlock); 2002 DO_TESTCASE_6("initialize held", init_held); 2003 2004 printk(" --------------------------------------------------------------------------\n"); 2005 print_testname("recursive read-lock"); 2006 pr_cont(" |"); 2007 dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK); 2008 pr_cont(" |"); 2009 dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM); 2010 pr_cont("\n"); 2011 2012 print_testname("recursive read-lock #2"); 2013 pr_cont(" |"); 2014 dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK); 2015 pr_cont(" |"); 2016 dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM); 2017 pr_cont("\n"); 2018 2019 print_testname("mixed read-write-lock"); 2020 pr_cont(" |"); 2021 dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK); 2022 pr_cont(" |"); 2023 dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM); 2024 pr_cont("\n"); 2025 2026 print_testname("mixed write-read-lock"); 2027 pr_cont(" |"); 2028 dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK); 2029 pr_cont(" |"); 2030 dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM); 2031 pr_cont("\n"); 2032 2033 print_testname("mixed read-lock/lock-write ABBA"); 2034 pr_cont(" |"); 2035 dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK); 2036 #ifdef CONFIG_PROVE_LOCKING 2037 /* 2038 * Lockdep does indeed fail here, but there's nothing we can do about 2039 * that now. Don't kill lockdep for it. 2040 */ 2041 unexpected_testcase_failures--; 2042 #endif 2043 2044 pr_cont(" |"); 2045 dotest(rwsem_ABBA1, FAILURE, LOCKTYPE_RWSEM); 2046 2047 print_testname("mixed read-lock/lock-read ABBA"); 2048 pr_cont(" |"); 2049 dotest(rlock_ABBA2, SUCCESS, LOCKTYPE_RWLOCK); 2050 pr_cont(" |"); 2051 dotest(rwsem_ABBA2, FAILURE, LOCKTYPE_RWSEM); 2052 2053 print_testname("mixed write-lock/lock-write ABBA"); 2054 pr_cont(" |"); 2055 dotest(rlock_ABBA3, FAILURE, LOCKTYPE_RWLOCK); 2056 pr_cont(" |"); 2057 dotest(rwsem_ABBA3, FAILURE, LOCKTYPE_RWSEM); 2058 2059 printk(" --------------------------------------------------------------------------\n"); 2060 2061 /* 2062 * irq-context testcases: 2063 */ 2064 DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1); 2065 DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A); 2066 DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B); 2067 DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3); 2068 DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4); 2069 DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion); 2070 2071 DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion); 2072 // DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2); 2073 2074 ww_tests(); 2075 2076 if (unexpected_testcase_failures) { 2077 printk("-----------------------------------------------------------------\n"); 2078 debug_locks = 0; 2079 printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n", 2080 unexpected_testcase_failures, testcase_total); 2081 printk("-----------------------------------------------------------------\n"); 2082 } else if (expected_testcase_failures && testcase_successes) { 2083 printk("--------------------------------------------------------\n"); 2084 printk("%3d out of %3d testcases failed, as expected. |\n", 2085 expected_testcase_failures, testcase_total); 2086 printk("----------------------------------------------------\n"); 2087 debug_locks = 1; 2088 } else if (expected_testcase_failures && !testcase_successes) { 2089 printk("--------------------------------------------------------\n"); 2090 printk("All %3d testcases failed, as expected. |\n", 2091 expected_testcase_failures); 2092 printk("----------------------------------------\n"); 2093 debug_locks = 1; 2094 } else { 2095 printk("-------------------------------------------------------\n"); 2096 printk("Good, all %3d testcases passed! |\n", 2097 testcase_successes); 2098 printk("---------------------------------\n"); 2099 debug_locks = 1; 2100 } 2101 lockdep_set_selftest_task(NULL); 2102 debug_locks_silent = 0; 2103 } 2104