1 /* 2 * lib/locking-selftest.c 3 * 4 * Testsuite for various locking APIs: spinlocks, rwlocks, 5 * mutexes and rw-semaphores. 6 * 7 * It is checking both false positives and false negatives. 8 * 9 * Started by Ingo Molnar: 10 * 11 * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> 12 */ 13 #include <linux/rwsem.h> 14 #include <linux/mutex.h> 15 #include <linux/sched.h> 16 #include <linux/delay.h> 17 #include <linux/lockdep.h> 18 #include <linux/spinlock.h> 19 #include <linux/kallsyms.h> 20 #include <linux/interrupt.h> 21 #include <linux/debug_locks.h> 22 #include <linux/irqflags.h> 23 24 /* 25 * Change this to 1 if you want to see the failure printouts: 26 */ 27 static unsigned int debug_locks_verbose; 28 29 static DEFINE_WW_CLASS(ww_lockdep); 30 31 static int __init setup_debug_locks_verbose(char *str) 32 { 33 get_option(&str, &debug_locks_verbose); 34 35 return 1; 36 } 37 38 __setup("debug_locks_verbose=", setup_debug_locks_verbose); 39 40 #define FAILURE 0 41 #define SUCCESS 1 42 43 #define LOCKTYPE_SPIN 0x1 44 #define LOCKTYPE_RWLOCK 0x2 45 #define LOCKTYPE_MUTEX 0x4 46 #define LOCKTYPE_RWSEM 0x8 47 #define LOCKTYPE_WW 0x10 48 49 static struct ww_acquire_ctx t, t2; 50 static struct ww_mutex o, o2, o3; 51 52 /* 53 * Normal standalone locks, for the circular and irq-context 54 * dependency tests: 55 */ 56 static DEFINE_RAW_SPINLOCK(lock_A); 57 static DEFINE_RAW_SPINLOCK(lock_B); 58 static DEFINE_RAW_SPINLOCK(lock_C); 59 static DEFINE_RAW_SPINLOCK(lock_D); 60 61 static DEFINE_RWLOCK(rwlock_A); 62 static DEFINE_RWLOCK(rwlock_B); 63 static DEFINE_RWLOCK(rwlock_C); 64 static DEFINE_RWLOCK(rwlock_D); 65 66 static DEFINE_MUTEX(mutex_A); 67 static DEFINE_MUTEX(mutex_B); 68 static DEFINE_MUTEX(mutex_C); 69 static DEFINE_MUTEX(mutex_D); 70 71 static DECLARE_RWSEM(rwsem_A); 72 static DECLARE_RWSEM(rwsem_B); 73 static DECLARE_RWSEM(rwsem_C); 74 static DECLARE_RWSEM(rwsem_D); 75 76 /* 77 * Locks that we initialize dynamically as well so that 78 * e.g. X1 and X2 becomes two instances of the same class, 79 * but X* and Y* are different classes. We do this so that 80 * we do not trigger a real lockup: 81 */ 82 static DEFINE_RAW_SPINLOCK(lock_X1); 83 static DEFINE_RAW_SPINLOCK(lock_X2); 84 static DEFINE_RAW_SPINLOCK(lock_Y1); 85 static DEFINE_RAW_SPINLOCK(lock_Y2); 86 static DEFINE_RAW_SPINLOCK(lock_Z1); 87 static DEFINE_RAW_SPINLOCK(lock_Z2); 88 89 static DEFINE_RWLOCK(rwlock_X1); 90 static DEFINE_RWLOCK(rwlock_X2); 91 static DEFINE_RWLOCK(rwlock_Y1); 92 static DEFINE_RWLOCK(rwlock_Y2); 93 static DEFINE_RWLOCK(rwlock_Z1); 94 static DEFINE_RWLOCK(rwlock_Z2); 95 96 static DEFINE_MUTEX(mutex_X1); 97 static DEFINE_MUTEX(mutex_X2); 98 static DEFINE_MUTEX(mutex_Y1); 99 static DEFINE_MUTEX(mutex_Y2); 100 static DEFINE_MUTEX(mutex_Z1); 101 static DEFINE_MUTEX(mutex_Z2); 102 103 static DECLARE_RWSEM(rwsem_X1); 104 static DECLARE_RWSEM(rwsem_X2); 105 static DECLARE_RWSEM(rwsem_Y1); 106 static DECLARE_RWSEM(rwsem_Y2); 107 static DECLARE_RWSEM(rwsem_Z1); 108 static DECLARE_RWSEM(rwsem_Z2); 109 110 /* 111 * non-inlined runtime initializers, to let separate locks share 112 * the same lock-class: 113 */ 114 #define INIT_CLASS_FUNC(class) \ 115 static noinline void \ 116 init_class_##class(raw_spinlock_t *lock, rwlock_t *rwlock, \ 117 struct mutex *mutex, struct rw_semaphore *rwsem)\ 118 { \ 119 raw_spin_lock_init(lock); \ 120 rwlock_init(rwlock); \ 121 mutex_init(mutex); \ 122 init_rwsem(rwsem); \ 123 } 124 125 INIT_CLASS_FUNC(X) 126 INIT_CLASS_FUNC(Y) 127 INIT_CLASS_FUNC(Z) 128 129 static void init_shared_classes(void) 130 { 131 init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1); 132 init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2); 133 134 init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1); 135 init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2); 136 137 init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1); 138 init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2); 139 } 140 141 /* 142 * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests. 143 * The following functions use a lock from a simulated hardirq/softirq 144 * context, causing the locks to be marked as hardirq-safe/softirq-safe: 145 */ 146 147 #define HARDIRQ_DISABLE local_irq_disable 148 #define HARDIRQ_ENABLE local_irq_enable 149 150 #define HARDIRQ_ENTER() \ 151 local_irq_disable(); \ 152 __irq_enter(); \ 153 WARN_ON(!in_irq()); 154 155 #define HARDIRQ_EXIT() \ 156 __irq_exit(); \ 157 local_irq_enable(); 158 159 #define SOFTIRQ_DISABLE local_bh_disable 160 #define SOFTIRQ_ENABLE local_bh_enable 161 162 #define SOFTIRQ_ENTER() \ 163 local_bh_disable(); \ 164 local_irq_disable(); \ 165 lockdep_softirq_enter(); \ 166 WARN_ON(!in_softirq()); 167 168 #define SOFTIRQ_EXIT() \ 169 lockdep_softirq_exit(); \ 170 local_irq_enable(); \ 171 local_bh_enable(); 172 173 /* 174 * Shortcuts for lock/unlock API variants, to keep 175 * the testcases compact: 176 */ 177 #define L(x) raw_spin_lock(&lock_##x) 178 #define U(x) raw_spin_unlock(&lock_##x) 179 #define LU(x) L(x); U(x) 180 #define SI(x) raw_spin_lock_init(&lock_##x) 181 182 #define WL(x) write_lock(&rwlock_##x) 183 #define WU(x) write_unlock(&rwlock_##x) 184 #define WLU(x) WL(x); WU(x) 185 186 #define RL(x) read_lock(&rwlock_##x) 187 #define RU(x) read_unlock(&rwlock_##x) 188 #define RLU(x) RL(x); RU(x) 189 #define RWI(x) rwlock_init(&rwlock_##x) 190 191 #define ML(x) mutex_lock(&mutex_##x) 192 #define MU(x) mutex_unlock(&mutex_##x) 193 #define MI(x) mutex_init(&mutex_##x) 194 195 #define WSL(x) down_write(&rwsem_##x) 196 #define WSU(x) up_write(&rwsem_##x) 197 198 #define RSL(x) down_read(&rwsem_##x) 199 #define RSU(x) up_read(&rwsem_##x) 200 #define RWSI(x) init_rwsem(&rwsem_##x) 201 202 #ifndef CONFIG_DEBUG_WW_MUTEX_SLOWPATH 203 #define WWAI(x) ww_acquire_init(x, &ww_lockdep) 204 #else 205 #define WWAI(x) do { ww_acquire_init(x, &ww_lockdep); (x)->deadlock_inject_countdown = ~0U; } while (0) 206 #endif 207 #define WWAD(x) ww_acquire_done(x) 208 #define WWAF(x) ww_acquire_fini(x) 209 210 #define WWL(x, c) ww_mutex_lock(x, c) 211 #define WWT(x) ww_mutex_trylock(x) 212 #define WWL1(x) ww_mutex_lock(x, NULL) 213 #define WWU(x) ww_mutex_unlock(x) 214 215 216 #define LOCK_UNLOCK_2(x,y) LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x) 217 218 /* 219 * Generate different permutations of the same testcase, using 220 * the same basic lock-dependency/state events: 221 */ 222 223 #define GENERATE_TESTCASE(name) \ 224 \ 225 static void name(void) { E(); } 226 227 #define GENERATE_PERMUTATIONS_2_EVENTS(name) \ 228 \ 229 static void name##_12(void) { E1(); E2(); } \ 230 static void name##_21(void) { E2(); E1(); } 231 232 #define GENERATE_PERMUTATIONS_3_EVENTS(name) \ 233 \ 234 static void name##_123(void) { E1(); E2(); E3(); } \ 235 static void name##_132(void) { E1(); E3(); E2(); } \ 236 static void name##_213(void) { E2(); E1(); E3(); } \ 237 static void name##_231(void) { E2(); E3(); E1(); } \ 238 static void name##_312(void) { E3(); E1(); E2(); } \ 239 static void name##_321(void) { E3(); E2(); E1(); } 240 241 /* 242 * AA deadlock: 243 */ 244 245 #define E() \ 246 \ 247 LOCK(X1); \ 248 LOCK(X2); /* this one should fail */ 249 250 /* 251 * 6 testcases: 252 */ 253 #include "locking-selftest-spin.h" 254 GENERATE_TESTCASE(AA_spin) 255 #include "locking-selftest-wlock.h" 256 GENERATE_TESTCASE(AA_wlock) 257 #include "locking-selftest-rlock.h" 258 GENERATE_TESTCASE(AA_rlock) 259 #include "locking-selftest-mutex.h" 260 GENERATE_TESTCASE(AA_mutex) 261 #include "locking-selftest-wsem.h" 262 GENERATE_TESTCASE(AA_wsem) 263 #include "locking-selftest-rsem.h" 264 GENERATE_TESTCASE(AA_rsem) 265 266 #undef E 267 268 /* 269 * Special-case for read-locking, they are 270 * allowed to recurse on the same lock class: 271 */ 272 static void rlock_AA1(void) 273 { 274 RL(X1); 275 RL(X1); // this one should NOT fail 276 } 277 278 static void rlock_AA1B(void) 279 { 280 RL(X1); 281 RL(X2); // this one should NOT fail 282 } 283 284 static void rsem_AA1(void) 285 { 286 RSL(X1); 287 RSL(X1); // this one should fail 288 } 289 290 static void rsem_AA1B(void) 291 { 292 RSL(X1); 293 RSL(X2); // this one should fail 294 } 295 /* 296 * The mixing of read and write locks is not allowed: 297 */ 298 static void rlock_AA2(void) 299 { 300 RL(X1); 301 WL(X2); // this one should fail 302 } 303 304 static void rsem_AA2(void) 305 { 306 RSL(X1); 307 WSL(X2); // this one should fail 308 } 309 310 static void rlock_AA3(void) 311 { 312 WL(X1); 313 RL(X2); // this one should fail 314 } 315 316 static void rsem_AA3(void) 317 { 318 WSL(X1); 319 RSL(X2); // this one should fail 320 } 321 322 /* 323 * ABBA deadlock: 324 */ 325 326 #define E() \ 327 \ 328 LOCK_UNLOCK_2(A, B); \ 329 LOCK_UNLOCK_2(B, A); /* fail */ 330 331 /* 332 * 6 testcases: 333 */ 334 #include "locking-selftest-spin.h" 335 GENERATE_TESTCASE(ABBA_spin) 336 #include "locking-selftest-wlock.h" 337 GENERATE_TESTCASE(ABBA_wlock) 338 #include "locking-selftest-rlock.h" 339 GENERATE_TESTCASE(ABBA_rlock) 340 #include "locking-selftest-mutex.h" 341 GENERATE_TESTCASE(ABBA_mutex) 342 #include "locking-selftest-wsem.h" 343 GENERATE_TESTCASE(ABBA_wsem) 344 #include "locking-selftest-rsem.h" 345 GENERATE_TESTCASE(ABBA_rsem) 346 347 #undef E 348 349 /* 350 * AB BC CA deadlock: 351 */ 352 353 #define E() \ 354 \ 355 LOCK_UNLOCK_2(A, B); \ 356 LOCK_UNLOCK_2(B, C); \ 357 LOCK_UNLOCK_2(C, A); /* fail */ 358 359 /* 360 * 6 testcases: 361 */ 362 #include "locking-selftest-spin.h" 363 GENERATE_TESTCASE(ABBCCA_spin) 364 #include "locking-selftest-wlock.h" 365 GENERATE_TESTCASE(ABBCCA_wlock) 366 #include "locking-selftest-rlock.h" 367 GENERATE_TESTCASE(ABBCCA_rlock) 368 #include "locking-selftest-mutex.h" 369 GENERATE_TESTCASE(ABBCCA_mutex) 370 #include "locking-selftest-wsem.h" 371 GENERATE_TESTCASE(ABBCCA_wsem) 372 #include "locking-selftest-rsem.h" 373 GENERATE_TESTCASE(ABBCCA_rsem) 374 375 #undef E 376 377 /* 378 * AB CA BC deadlock: 379 */ 380 381 #define E() \ 382 \ 383 LOCK_UNLOCK_2(A, B); \ 384 LOCK_UNLOCK_2(C, A); \ 385 LOCK_UNLOCK_2(B, C); /* fail */ 386 387 /* 388 * 6 testcases: 389 */ 390 #include "locking-selftest-spin.h" 391 GENERATE_TESTCASE(ABCABC_spin) 392 #include "locking-selftest-wlock.h" 393 GENERATE_TESTCASE(ABCABC_wlock) 394 #include "locking-selftest-rlock.h" 395 GENERATE_TESTCASE(ABCABC_rlock) 396 #include "locking-selftest-mutex.h" 397 GENERATE_TESTCASE(ABCABC_mutex) 398 #include "locking-selftest-wsem.h" 399 GENERATE_TESTCASE(ABCABC_wsem) 400 #include "locking-selftest-rsem.h" 401 GENERATE_TESTCASE(ABCABC_rsem) 402 403 #undef E 404 405 /* 406 * AB BC CD DA deadlock: 407 */ 408 409 #define E() \ 410 \ 411 LOCK_UNLOCK_2(A, B); \ 412 LOCK_UNLOCK_2(B, C); \ 413 LOCK_UNLOCK_2(C, D); \ 414 LOCK_UNLOCK_2(D, A); /* fail */ 415 416 /* 417 * 6 testcases: 418 */ 419 #include "locking-selftest-spin.h" 420 GENERATE_TESTCASE(ABBCCDDA_spin) 421 #include "locking-selftest-wlock.h" 422 GENERATE_TESTCASE(ABBCCDDA_wlock) 423 #include "locking-selftest-rlock.h" 424 GENERATE_TESTCASE(ABBCCDDA_rlock) 425 #include "locking-selftest-mutex.h" 426 GENERATE_TESTCASE(ABBCCDDA_mutex) 427 #include "locking-selftest-wsem.h" 428 GENERATE_TESTCASE(ABBCCDDA_wsem) 429 #include "locking-selftest-rsem.h" 430 GENERATE_TESTCASE(ABBCCDDA_rsem) 431 432 #undef E 433 434 /* 435 * AB CD BD DA deadlock: 436 */ 437 #define E() \ 438 \ 439 LOCK_UNLOCK_2(A, B); \ 440 LOCK_UNLOCK_2(C, D); \ 441 LOCK_UNLOCK_2(B, D); \ 442 LOCK_UNLOCK_2(D, A); /* fail */ 443 444 /* 445 * 6 testcases: 446 */ 447 #include "locking-selftest-spin.h" 448 GENERATE_TESTCASE(ABCDBDDA_spin) 449 #include "locking-selftest-wlock.h" 450 GENERATE_TESTCASE(ABCDBDDA_wlock) 451 #include "locking-selftest-rlock.h" 452 GENERATE_TESTCASE(ABCDBDDA_rlock) 453 #include "locking-selftest-mutex.h" 454 GENERATE_TESTCASE(ABCDBDDA_mutex) 455 #include "locking-selftest-wsem.h" 456 GENERATE_TESTCASE(ABCDBDDA_wsem) 457 #include "locking-selftest-rsem.h" 458 GENERATE_TESTCASE(ABCDBDDA_rsem) 459 460 #undef E 461 462 /* 463 * AB CD BC DA deadlock: 464 */ 465 #define E() \ 466 \ 467 LOCK_UNLOCK_2(A, B); \ 468 LOCK_UNLOCK_2(C, D); \ 469 LOCK_UNLOCK_2(B, C); \ 470 LOCK_UNLOCK_2(D, A); /* fail */ 471 472 /* 473 * 6 testcases: 474 */ 475 #include "locking-selftest-spin.h" 476 GENERATE_TESTCASE(ABCDBCDA_spin) 477 #include "locking-selftest-wlock.h" 478 GENERATE_TESTCASE(ABCDBCDA_wlock) 479 #include "locking-selftest-rlock.h" 480 GENERATE_TESTCASE(ABCDBCDA_rlock) 481 #include "locking-selftest-mutex.h" 482 GENERATE_TESTCASE(ABCDBCDA_mutex) 483 #include "locking-selftest-wsem.h" 484 GENERATE_TESTCASE(ABCDBCDA_wsem) 485 #include "locking-selftest-rsem.h" 486 GENERATE_TESTCASE(ABCDBCDA_rsem) 487 488 #undef E 489 490 /* 491 * Double unlock: 492 */ 493 #define E() \ 494 \ 495 LOCK(A); \ 496 UNLOCK(A); \ 497 UNLOCK(A); /* fail */ 498 499 /* 500 * 6 testcases: 501 */ 502 #include "locking-selftest-spin.h" 503 GENERATE_TESTCASE(double_unlock_spin) 504 #include "locking-selftest-wlock.h" 505 GENERATE_TESTCASE(double_unlock_wlock) 506 #include "locking-selftest-rlock.h" 507 GENERATE_TESTCASE(double_unlock_rlock) 508 #include "locking-selftest-mutex.h" 509 GENERATE_TESTCASE(double_unlock_mutex) 510 #include "locking-selftest-wsem.h" 511 GENERATE_TESTCASE(double_unlock_wsem) 512 #include "locking-selftest-rsem.h" 513 GENERATE_TESTCASE(double_unlock_rsem) 514 515 #undef E 516 517 /* 518 * Bad unlock ordering: 519 */ 520 #define E() \ 521 \ 522 LOCK(A); \ 523 LOCK(B); \ 524 UNLOCK(A); /* fail */ \ 525 UNLOCK(B); 526 527 /* 528 * 6 testcases: 529 */ 530 #include "locking-selftest-spin.h" 531 GENERATE_TESTCASE(bad_unlock_order_spin) 532 #include "locking-selftest-wlock.h" 533 GENERATE_TESTCASE(bad_unlock_order_wlock) 534 #include "locking-selftest-rlock.h" 535 GENERATE_TESTCASE(bad_unlock_order_rlock) 536 #include "locking-selftest-mutex.h" 537 GENERATE_TESTCASE(bad_unlock_order_mutex) 538 #include "locking-selftest-wsem.h" 539 GENERATE_TESTCASE(bad_unlock_order_wsem) 540 #include "locking-selftest-rsem.h" 541 GENERATE_TESTCASE(bad_unlock_order_rsem) 542 543 #undef E 544 545 /* 546 * initializing a held lock: 547 */ 548 #define E() \ 549 \ 550 LOCK(A); \ 551 INIT(A); /* fail */ 552 553 /* 554 * 6 testcases: 555 */ 556 #include "locking-selftest-spin.h" 557 GENERATE_TESTCASE(init_held_spin) 558 #include "locking-selftest-wlock.h" 559 GENERATE_TESTCASE(init_held_wlock) 560 #include "locking-selftest-rlock.h" 561 GENERATE_TESTCASE(init_held_rlock) 562 #include "locking-selftest-mutex.h" 563 GENERATE_TESTCASE(init_held_mutex) 564 #include "locking-selftest-wsem.h" 565 GENERATE_TESTCASE(init_held_wsem) 566 #include "locking-selftest-rsem.h" 567 GENERATE_TESTCASE(init_held_rsem) 568 569 #undef E 570 571 /* 572 * locking an irq-safe lock with irqs enabled: 573 */ 574 #define E1() \ 575 \ 576 IRQ_ENTER(); \ 577 LOCK(A); \ 578 UNLOCK(A); \ 579 IRQ_EXIT(); 580 581 #define E2() \ 582 \ 583 LOCK(A); \ 584 UNLOCK(A); 585 586 /* 587 * Generate 24 testcases: 588 */ 589 #include "locking-selftest-spin-hardirq.h" 590 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin) 591 592 #include "locking-selftest-rlock-hardirq.h" 593 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock) 594 595 #include "locking-selftest-wlock-hardirq.h" 596 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock) 597 598 #include "locking-selftest-spin-softirq.h" 599 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin) 600 601 #include "locking-selftest-rlock-softirq.h" 602 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock) 603 604 #include "locking-selftest-wlock-softirq.h" 605 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock) 606 607 #undef E1 608 #undef E2 609 610 /* 611 * Enabling hardirqs with a softirq-safe lock held: 612 */ 613 #define E1() \ 614 \ 615 SOFTIRQ_ENTER(); \ 616 LOCK(A); \ 617 UNLOCK(A); \ 618 SOFTIRQ_EXIT(); 619 620 #define E2() \ 621 \ 622 HARDIRQ_DISABLE(); \ 623 LOCK(A); \ 624 HARDIRQ_ENABLE(); \ 625 UNLOCK(A); 626 627 /* 628 * Generate 12 testcases: 629 */ 630 #include "locking-selftest-spin.h" 631 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin) 632 633 #include "locking-selftest-wlock.h" 634 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock) 635 636 #include "locking-selftest-rlock.h" 637 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock) 638 639 #undef E1 640 #undef E2 641 642 /* 643 * Enabling irqs with an irq-safe lock held: 644 */ 645 #define E1() \ 646 \ 647 IRQ_ENTER(); \ 648 LOCK(A); \ 649 UNLOCK(A); \ 650 IRQ_EXIT(); 651 652 #define E2() \ 653 \ 654 IRQ_DISABLE(); \ 655 LOCK(A); \ 656 IRQ_ENABLE(); \ 657 UNLOCK(A); 658 659 /* 660 * Generate 24 testcases: 661 */ 662 #include "locking-selftest-spin-hardirq.h" 663 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin) 664 665 #include "locking-selftest-rlock-hardirq.h" 666 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock) 667 668 #include "locking-selftest-wlock-hardirq.h" 669 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock) 670 671 #include "locking-selftest-spin-softirq.h" 672 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin) 673 674 #include "locking-selftest-rlock-softirq.h" 675 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock) 676 677 #include "locking-selftest-wlock-softirq.h" 678 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock) 679 680 #undef E1 681 #undef E2 682 683 /* 684 * Acquiring a irq-unsafe lock while holding an irq-safe-lock: 685 */ 686 #define E1() \ 687 \ 688 LOCK(A); \ 689 LOCK(B); \ 690 UNLOCK(B); \ 691 UNLOCK(A); \ 692 693 #define E2() \ 694 \ 695 LOCK(B); \ 696 UNLOCK(B); 697 698 #define E3() \ 699 \ 700 IRQ_ENTER(); \ 701 LOCK(A); \ 702 UNLOCK(A); \ 703 IRQ_EXIT(); 704 705 /* 706 * Generate 36 testcases: 707 */ 708 #include "locking-selftest-spin-hardirq.h" 709 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin) 710 711 #include "locking-selftest-rlock-hardirq.h" 712 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock) 713 714 #include "locking-selftest-wlock-hardirq.h" 715 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock) 716 717 #include "locking-selftest-spin-softirq.h" 718 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin) 719 720 #include "locking-selftest-rlock-softirq.h" 721 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock) 722 723 #include "locking-selftest-wlock-softirq.h" 724 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock) 725 726 #undef E1 727 #undef E2 728 #undef E3 729 730 /* 731 * If a lock turns into softirq-safe, but earlier it took 732 * a softirq-unsafe lock: 733 */ 734 735 #define E1() \ 736 IRQ_DISABLE(); \ 737 LOCK(A); \ 738 LOCK(B); \ 739 UNLOCK(B); \ 740 UNLOCK(A); \ 741 IRQ_ENABLE(); 742 743 #define E2() \ 744 LOCK(B); \ 745 UNLOCK(B); 746 747 #define E3() \ 748 IRQ_ENTER(); \ 749 LOCK(A); \ 750 UNLOCK(A); \ 751 IRQ_EXIT(); 752 753 /* 754 * Generate 36 testcases: 755 */ 756 #include "locking-selftest-spin-hardirq.h" 757 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin) 758 759 #include "locking-selftest-rlock-hardirq.h" 760 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock) 761 762 #include "locking-selftest-wlock-hardirq.h" 763 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock) 764 765 #include "locking-selftest-spin-softirq.h" 766 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin) 767 768 #include "locking-selftest-rlock-softirq.h" 769 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock) 770 771 #include "locking-selftest-wlock-softirq.h" 772 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock) 773 774 #undef E1 775 #undef E2 776 #undef E3 777 778 /* 779 * read-lock / write-lock irq inversion. 780 * 781 * Deadlock scenario: 782 * 783 * CPU#1 is at #1, i.e. it has write-locked A, but has not 784 * taken B yet. 785 * 786 * CPU#2 is at #2, i.e. it has locked B. 787 * 788 * Hardirq hits CPU#2 at point #2 and is trying to read-lock A. 789 * 790 * The deadlock occurs because CPU#1 will spin on B, and CPU#2 791 * will spin on A. 792 */ 793 794 #define E1() \ 795 \ 796 IRQ_DISABLE(); \ 797 WL(A); \ 798 LOCK(B); \ 799 UNLOCK(B); \ 800 WU(A); \ 801 IRQ_ENABLE(); 802 803 #define E2() \ 804 \ 805 LOCK(B); \ 806 UNLOCK(B); 807 808 #define E3() \ 809 \ 810 IRQ_ENTER(); \ 811 RL(A); \ 812 RU(A); \ 813 IRQ_EXIT(); 814 815 /* 816 * Generate 36 testcases: 817 */ 818 #include "locking-selftest-spin-hardirq.h" 819 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin) 820 821 #include "locking-selftest-rlock-hardirq.h" 822 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock) 823 824 #include "locking-selftest-wlock-hardirq.h" 825 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock) 826 827 #include "locking-selftest-spin-softirq.h" 828 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin) 829 830 #include "locking-selftest-rlock-softirq.h" 831 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock) 832 833 #include "locking-selftest-wlock-softirq.h" 834 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock) 835 836 #undef E1 837 #undef E2 838 #undef E3 839 840 /* 841 * read-lock / write-lock recursion that is actually safe. 842 */ 843 844 #define E1() \ 845 \ 846 IRQ_DISABLE(); \ 847 WL(A); \ 848 WU(A); \ 849 IRQ_ENABLE(); 850 851 #define E2() \ 852 \ 853 RL(A); \ 854 RU(A); \ 855 856 #define E3() \ 857 \ 858 IRQ_ENTER(); \ 859 RL(A); \ 860 L(B); \ 861 U(B); \ 862 RU(A); \ 863 IRQ_EXIT(); 864 865 /* 866 * Generate 12 testcases: 867 */ 868 #include "locking-selftest-hardirq.h" 869 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard) 870 871 #include "locking-selftest-softirq.h" 872 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft) 873 874 #undef E1 875 #undef E2 876 #undef E3 877 878 /* 879 * read-lock / write-lock recursion that is unsafe. 880 */ 881 882 #define E1() \ 883 \ 884 IRQ_DISABLE(); \ 885 L(B); \ 886 WL(A); \ 887 WU(A); \ 888 U(B); \ 889 IRQ_ENABLE(); 890 891 #define E2() \ 892 \ 893 RL(A); \ 894 RU(A); \ 895 896 #define E3() \ 897 \ 898 IRQ_ENTER(); \ 899 L(B); \ 900 U(B); \ 901 IRQ_EXIT(); 902 903 /* 904 * Generate 12 testcases: 905 */ 906 #include "locking-selftest-hardirq.h" 907 // GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard) 908 909 #include "locking-selftest-softirq.h" 910 // GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft) 911 912 #ifdef CONFIG_DEBUG_LOCK_ALLOC 913 # define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map) 914 # define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map) 915 # define I_MUTEX(x) lockdep_reset_lock(&mutex_##x.dep_map) 916 # define I_RWSEM(x) lockdep_reset_lock(&rwsem_##x.dep_map) 917 # define I_WW(x) lockdep_reset_lock(&x.dep_map) 918 #else 919 # define I_SPINLOCK(x) 920 # define I_RWLOCK(x) 921 # define I_MUTEX(x) 922 # define I_RWSEM(x) 923 # define I_WW(x) 924 #endif 925 926 #define I1(x) \ 927 do { \ 928 I_SPINLOCK(x); \ 929 I_RWLOCK(x); \ 930 I_MUTEX(x); \ 931 I_RWSEM(x); \ 932 } while (0) 933 934 #define I2(x) \ 935 do { \ 936 raw_spin_lock_init(&lock_##x); \ 937 rwlock_init(&rwlock_##x); \ 938 mutex_init(&mutex_##x); \ 939 init_rwsem(&rwsem_##x); \ 940 } while (0) 941 942 static void reset_locks(void) 943 { 944 local_irq_disable(); 945 lockdep_free_key_range(&ww_lockdep.acquire_key, 1); 946 lockdep_free_key_range(&ww_lockdep.mutex_key, 1); 947 948 I1(A); I1(B); I1(C); I1(D); 949 I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2); 950 I_WW(t); I_WW(t2); I_WW(o.base); I_WW(o2.base); I_WW(o3.base); 951 lockdep_reset(); 952 I2(A); I2(B); I2(C); I2(D); 953 init_shared_classes(); 954 955 ww_mutex_init(&o, &ww_lockdep); ww_mutex_init(&o2, &ww_lockdep); ww_mutex_init(&o3, &ww_lockdep); 956 memset(&t, 0, sizeof(t)); memset(&t2, 0, sizeof(t2)); 957 memset(&ww_lockdep.acquire_key, 0, sizeof(ww_lockdep.acquire_key)); 958 memset(&ww_lockdep.mutex_key, 0, sizeof(ww_lockdep.mutex_key)); 959 local_irq_enable(); 960 } 961 962 #undef I 963 964 static int testcase_total; 965 static int testcase_successes; 966 static int expected_testcase_failures; 967 static int unexpected_testcase_failures; 968 969 static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask) 970 { 971 unsigned long saved_preempt_count = preempt_count(); 972 973 WARN_ON(irqs_disabled()); 974 975 testcase_fn(); 976 /* 977 * Filter out expected failures: 978 */ 979 #ifndef CONFIG_PROVE_LOCKING 980 if (expected == FAILURE && debug_locks) { 981 expected_testcase_failures++; 982 printk("failed|"); 983 } 984 else 985 #endif 986 if (debug_locks != expected) { 987 unexpected_testcase_failures++; 988 printk("FAILED|"); 989 990 dump_stack(); 991 } else { 992 testcase_successes++; 993 printk(" ok |"); 994 } 995 testcase_total++; 996 997 if (debug_locks_verbose) 998 printk(" lockclass mask: %x, debug_locks: %d, expected: %d\n", 999 lockclass_mask, debug_locks, expected); 1000 /* 1001 * Some tests (e.g. double-unlock) might corrupt the preemption 1002 * count, so restore it: 1003 */ 1004 preempt_count() = saved_preempt_count; 1005 #ifdef CONFIG_TRACE_IRQFLAGS 1006 if (softirq_count()) 1007 current->softirqs_enabled = 0; 1008 else 1009 current->softirqs_enabled = 1; 1010 #endif 1011 1012 reset_locks(); 1013 } 1014 1015 static inline void print_testname(const char *testname) 1016 { 1017 printk("%33s:", testname); 1018 } 1019 1020 #define DO_TESTCASE_1(desc, name, nr) \ 1021 print_testname(desc"/"#nr); \ 1022 dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ 1023 printk("\n"); 1024 1025 #define DO_TESTCASE_1B(desc, name, nr) \ 1026 print_testname(desc"/"#nr); \ 1027 dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \ 1028 printk("\n"); 1029 1030 #define DO_TESTCASE_3(desc, name, nr) \ 1031 print_testname(desc"/"#nr); \ 1032 dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \ 1033 dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ 1034 dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ 1035 printk("\n"); 1036 1037 #define DO_TESTCASE_3RW(desc, name, nr) \ 1038 print_testname(desc"/"#nr); \ 1039 dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\ 1040 dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ 1041 dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ 1042 printk("\n"); 1043 1044 #define DO_TESTCASE_6(desc, name) \ 1045 print_testname(desc); \ 1046 dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ 1047 dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ 1048 dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK); \ 1049 dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ 1050 dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ 1051 dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ 1052 printk("\n"); 1053 1054 #define DO_TESTCASE_6_SUCCESS(desc, name) \ 1055 print_testname(desc); \ 1056 dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN); \ 1057 dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK); \ 1058 dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ 1059 dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX); \ 1060 dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM); \ 1061 dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM); \ 1062 printk("\n"); 1063 1064 /* 1065 * 'read' variant: rlocks must not trigger. 1066 */ 1067 #define DO_TESTCASE_6R(desc, name) \ 1068 print_testname(desc); \ 1069 dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ 1070 dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ 1071 dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ 1072 dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ 1073 dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ 1074 dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ 1075 printk("\n"); 1076 1077 #define DO_TESTCASE_2I(desc, name, nr) \ 1078 DO_TESTCASE_1("hard-"desc, name##_hard, nr); \ 1079 DO_TESTCASE_1("soft-"desc, name##_soft, nr); 1080 1081 #define DO_TESTCASE_2IB(desc, name, nr) \ 1082 DO_TESTCASE_1B("hard-"desc, name##_hard, nr); \ 1083 DO_TESTCASE_1B("soft-"desc, name##_soft, nr); 1084 1085 #define DO_TESTCASE_6I(desc, name, nr) \ 1086 DO_TESTCASE_3("hard-"desc, name##_hard, nr); \ 1087 DO_TESTCASE_3("soft-"desc, name##_soft, nr); 1088 1089 #define DO_TESTCASE_6IRW(desc, name, nr) \ 1090 DO_TESTCASE_3RW("hard-"desc, name##_hard, nr); \ 1091 DO_TESTCASE_3RW("soft-"desc, name##_soft, nr); 1092 1093 #define DO_TESTCASE_2x3(desc, name) \ 1094 DO_TESTCASE_3(desc, name, 12); \ 1095 DO_TESTCASE_3(desc, name, 21); 1096 1097 #define DO_TESTCASE_2x6(desc, name) \ 1098 DO_TESTCASE_6I(desc, name, 12); \ 1099 DO_TESTCASE_6I(desc, name, 21); 1100 1101 #define DO_TESTCASE_6x2(desc, name) \ 1102 DO_TESTCASE_2I(desc, name, 123); \ 1103 DO_TESTCASE_2I(desc, name, 132); \ 1104 DO_TESTCASE_2I(desc, name, 213); \ 1105 DO_TESTCASE_2I(desc, name, 231); \ 1106 DO_TESTCASE_2I(desc, name, 312); \ 1107 DO_TESTCASE_2I(desc, name, 321); 1108 1109 #define DO_TESTCASE_6x2B(desc, name) \ 1110 DO_TESTCASE_2IB(desc, name, 123); \ 1111 DO_TESTCASE_2IB(desc, name, 132); \ 1112 DO_TESTCASE_2IB(desc, name, 213); \ 1113 DO_TESTCASE_2IB(desc, name, 231); \ 1114 DO_TESTCASE_2IB(desc, name, 312); \ 1115 DO_TESTCASE_2IB(desc, name, 321); 1116 1117 #define DO_TESTCASE_6x6(desc, name) \ 1118 DO_TESTCASE_6I(desc, name, 123); \ 1119 DO_TESTCASE_6I(desc, name, 132); \ 1120 DO_TESTCASE_6I(desc, name, 213); \ 1121 DO_TESTCASE_6I(desc, name, 231); \ 1122 DO_TESTCASE_6I(desc, name, 312); \ 1123 DO_TESTCASE_6I(desc, name, 321); 1124 1125 #define DO_TESTCASE_6x6RW(desc, name) \ 1126 DO_TESTCASE_6IRW(desc, name, 123); \ 1127 DO_TESTCASE_6IRW(desc, name, 132); \ 1128 DO_TESTCASE_6IRW(desc, name, 213); \ 1129 DO_TESTCASE_6IRW(desc, name, 231); \ 1130 DO_TESTCASE_6IRW(desc, name, 312); \ 1131 DO_TESTCASE_6IRW(desc, name, 321); 1132 1133 static void ww_test_fail_acquire(void) 1134 { 1135 int ret; 1136 1137 WWAI(&t); 1138 t.stamp++; 1139 1140 ret = WWL(&o, &t); 1141 1142 if (WARN_ON(!o.ctx) || 1143 WARN_ON(ret)) 1144 return; 1145 1146 /* No lockdep test, pure API */ 1147 ret = WWL(&o, &t); 1148 WARN_ON(ret != -EALREADY); 1149 1150 ret = WWT(&o); 1151 WARN_ON(ret); 1152 1153 t2 = t; 1154 t2.stamp++; 1155 ret = WWL(&o, &t2); 1156 WARN_ON(ret != -EDEADLK); 1157 WWU(&o); 1158 1159 if (WWT(&o)) 1160 WWU(&o); 1161 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1162 else 1163 DEBUG_LOCKS_WARN_ON(1); 1164 #endif 1165 } 1166 1167 static void ww_test_normal(void) 1168 { 1169 int ret; 1170 1171 WWAI(&t); 1172 1173 /* 1174 * None of the ww_mutex codepaths should be taken in the 'normal' 1175 * mutex calls. The easiest way to verify this is by using the 1176 * normal mutex calls, and making sure o.ctx is unmodified. 1177 */ 1178 1179 /* mutex_lock (and indirectly, mutex_lock_nested) */ 1180 o.ctx = (void *)~0UL; 1181 mutex_lock(&o.base); 1182 mutex_unlock(&o.base); 1183 WARN_ON(o.ctx != (void *)~0UL); 1184 1185 /* mutex_lock_interruptible (and *_nested) */ 1186 o.ctx = (void *)~0UL; 1187 ret = mutex_lock_interruptible(&o.base); 1188 if (!ret) 1189 mutex_unlock(&o.base); 1190 else 1191 WARN_ON(1); 1192 WARN_ON(o.ctx != (void *)~0UL); 1193 1194 /* mutex_lock_killable (and *_nested) */ 1195 o.ctx = (void *)~0UL; 1196 ret = mutex_lock_killable(&o.base); 1197 if (!ret) 1198 mutex_unlock(&o.base); 1199 else 1200 WARN_ON(1); 1201 WARN_ON(o.ctx != (void *)~0UL); 1202 1203 /* trylock, succeeding */ 1204 o.ctx = (void *)~0UL; 1205 ret = mutex_trylock(&o.base); 1206 WARN_ON(!ret); 1207 if (ret) 1208 mutex_unlock(&o.base); 1209 else 1210 WARN_ON(1); 1211 WARN_ON(o.ctx != (void *)~0UL); 1212 1213 /* trylock, failing */ 1214 o.ctx = (void *)~0UL; 1215 mutex_lock(&o.base); 1216 ret = mutex_trylock(&o.base); 1217 WARN_ON(ret); 1218 mutex_unlock(&o.base); 1219 WARN_ON(o.ctx != (void *)~0UL); 1220 1221 /* nest_lock */ 1222 o.ctx = (void *)~0UL; 1223 mutex_lock_nest_lock(&o.base, &t); 1224 mutex_unlock(&o.base); 1225 WARN_ON(o.ctx != (void *)~0UL); 1226 } 1227 1228 static void ww_test_two_contexts(void) 1229 { 1230 WWAI(&t); 1231 WWAI(&t2); 1232 } 1233 1234 static void ww_test_diff_class(void) 1235 { 1236 WWAI(&t); 1237 #ifdef CONFIG_DEBUG_MUTEXES 1238 t.ww_class = NULL; 1239 #endif 1240 WWL(&o, &t); 1241 } 1242 1243 static void ww_test_context_done_twice(void) 1244 { 1245 WWAI(&t); 1246 WWAD(&t); 1247 WWAD(&t); 1248 WWAF(&t); 1249 } 1250 1251 static void ww_test_context_unlock_twice(void) 1252 { 1253 WWAI(&t); 1254 WWAD(&t); 1255 WWAF(&t); 1256 WWAF(&t); 1257 } 1258 1259 static void ww_test_context_fini_early(void) 1260 { 1261 WWAI(&t); 1262 WWL(&o, &t); 1263 WWAD(&t); 1264 WWAF(&t); 1265 } 1266 1267 static void ww_test_context_lock_after_done(void) 1268 { 1269 WWAI(&t); 1270 WWAD(&t); 1271 WWL(&o, &t); 1272 } 1273 1274 static void ww_test_object_unlock_twice(void) 1275 { 1276 WWL1(&o); 1277 WWU(&o); 1278 WWU(&o); 1279 } 1280 1281 static void ww_test_object_lock_unbalanced(void) 1282 { 1283 WWAI(&t); 1284 WWL(&o, &t); 1285 t.acquired = 0; 1286 WWU(&o); 1287 WWAF(&t); 1288 } 1289 1290 static void ww_test_object_lock_stale_context(void) 1291 { 1292 WWAI(&t); 1293 o.ctx = &t2; 1294 WWL(&o, &t); 1295 } 1296 1297 static void ww_test_edeadlk_normal(void) 1298 { 1299 int ret; 1300 1301 mutex_lock(&o2.base); 1302 o2.ctx = &t2; 1303 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1304 1305 WWAI(&t); 1306 t2 = t; 1307 t2.stamp--; 1308 1309 ret = WWL(&o, &t); 1310 WARN_ON(ret); 1311 1312 ret = WWL(&o2, &t); 1313 WARN_ON(ret != -EDEADLK); 1314 1315 o2.ctx = NULL; 1316 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); 1317 mutex_unlock(&o2.base); 1318 WWU(&o); 1319 1320 WWL(&o2, &t); 1321 } 1322 1323 static void ww_test_edeadlk_normal_slow(void) 1324 { 1325 int ret; 1326 1327 mutex_lock(&o2.base); 1328 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1329 o2.ctx = &t2; 1330 1331 WWAI(&t); 1332 t2 = t; 1333 t2.stamp--; 1334 1335 ret = WWL(&o, &t); 1336 WARN_ON(ret); 1337 1338 ret = WWL(&o2, &t); 1339 WARN_ON(ret != -EDEADLK); 1340 1341 o2.ctx = NULL; 1342 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); 1343 mutex_unlock(&o2.base); 1344 WWU(&o); 1345 1346 ww_mutex_lock_slow(&o2, &t); 1347 } 1348 1349 static void ww_test_edeadlk_no_unlock(void) 1350 { 1351 int ret; 1352 1353 mutex_lock(&o2.base); 1354 o2.ctx = &t2; 1355 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1356 1357 WWAI(&t); 1358 t2 = t; 1359 t2.stamp--; 1360 1361 ret = WWL(&o, &t); 1362 WARN_ON(ret); 1363 1364 ret = WWL(&o2, &t); 1365 WARN_ON(ret != -EDEADLK); 1366 1367 o2.ctx = NULL; 1368 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); 1369 mutex_unlock(&o2.base); 1370 1371 WWL(&o2, &t); 1372 } 1373 1374 static void ww_test_edeadlk_no_unlock_slow(void) 1375 { 1376 int ret; 1377 1378 mutex_lock(&o2.base); 1379 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1380 o2.ctx = &t2; 1381 1382 WWAI(&t); 1383 t2 = t; 1384 t2.stamp--; 1385 1386 ret = WWL(&o, &t); 1387 WARN_ON(ret); 1388 1389 ret = WWL(&o2, &t); 1390 WARN_ON(ret != -EDEADLK); 1391 1392 o2.ctx = NULL; 1393 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); 1394 mutex_unlock(&o2.base); 1395 1396 ww_mutex_lock_slow(&o2, &t); 1397 } 1398 1399 static void ww_test_edeadlk_acquire_more(void) 1400 { 1401 int ret; 1402 1403 mutex_lock(&o2.base); 1404 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1405 o2.ctx = &t2; 1406 1407 WWAI(&t); 1408 t2 = t; 1409 t2.stamp--; 1410 1411 ret = WWL(&o, &t); 1412 WARN_ON(ret); 1413 1414 ret = WWL(&o2, &t); 1415 WARN_ON(ret != -EDEADLK); 1416 1417 ret = WWL(&o3, &t); 1418 } 1419 1420 static void ww_test_edeadlk_acquire_more_slow(void) 1421 { 1422 int ret; 1423 1424 mutex_lock(&o2.base); 1425 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1426 o2.ctx = &t2; 1427 1428 WWAI(&t); 1429 t2 = t; 1430 t2.stamp--; 1431 1432 ret = WWL(&o, &t); 1433 WARN_ON(ret); 1434 1435 ret = WWL(&o2, &t); 1436 WARN_ON(ret != -EDEADLK); 1437 1438 ww_mutex_lock_slow(&o3, &t); 1439 } 1440 1441 static void ww_test_edeadlk_acquire_more_edeadlk(void) 1442 { 1443 int ret; 1444 1445 mutex_lock(&o2.base); 1446 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1447 o2.ctx = &t2; 1448 1449 mutex_lock(&o3.base); 1450 mutex_release(&o3.base.dep_map, 1, _THIS_IP_); 1451 o3.ctx = &t2; 1452 1453 WWAI(&t); 1454 t2 = t; 1455 t2.stamp--; 1456 1457 ret = WWL(&o, &t); 1458 WARN_ON(ret); 1459 1460 ret = WWL(&o2, &t); 1461 WARN_ON(ret != -EDEADLK); 1462 1463 ret = WWL(&o3, &t); 1464 WARN_ON(ret != -EDEADLK); 1465 } 1466 1467 static void ww_test_edeadlk_acquire_more_edeadlk_slow(void) 1468 { 1469 int ret; 1470 1471 mutex_lock(&o2.base); 1472 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1473 o2.ctx = &t2; 1474 1475 mutex_lock(&o3.base); 1476 mutex_release(&o3.base.dep_map, 1, _THIS_IP_); 1477 o3.ctx = &t2; 1478 1479 WWAI(&t); 1480 t2 = t; 1481 t2.stamp--; 1482 1483 ret = WWL(&o, &t); 1484 WARN_ON(ret); 1485 1486 ret = WWL(&o2, &t); 1487 WARN_ON(ret != -EDEADLK); 1488 1489 ww_mutex_lock_slow(&o3, &t); 1490 } 1491 1492 static void ww_test_edeadlk_acquire_wrong(void) 1493 { 1494 int ret; 1495 1496 mutex_lock(&o2.base); 1497 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1498 o2.ctx = &t2; 1499 1500 WWAI(&t); 1501 t2 = t; 1502 t2.stamp--; 1503 1504 ret = WWL(&o, &t); 1505 WARN_ON(ret); 1506 1507 ret = WWL(&o2, &t); 1508 WARN_ON(ret != -EDEADLK); 1509 if (!ret) 1510 WWU(&o2); 1511 1512 WWU(&o); 1513 1514 ret = WWL(&o3, &t); 1515 } 1516 1517 static void ww_test_edeadlk_acquire_wrong_slow(void) 1518 { 1519 int ret; 1520 1521 mutex_lock(&o2.base); 1522 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1523 o2.ctx = &t2; 1524 1525 WWAI(&t); 1526 t2 = t; 1527 t2.stamp--; 1528 1529 ret = WWL(&o, &t); 1530 WARN_ON(ret); 1531 1532 ret = WWL(&o2, &t); 1533 WARN_ON(ret != -EDEADLK); 1534 if (!ret) 1535 WWU(&o2); 1536 1537 WWU(&o); 1538 1539 ww_mutex_lock_slow(&o3, &t); 1540 } 1541 1542 static void ww_test_spin_nest_unlocked(void) 1543 { 1544 raw_spin_lock_nest_lock(&lock_A, &o.base); 1545 U(A); 1546 } 1547 1548 static void ww_test_unneeded_slow(void) 1549 { 1550 WWAI(&t); 1551 1552 ww_mutex_lock_slow(&o, &t); 1553 } 1554 1555 static void ww_test_context_block(void) 1556 { 1557 int ret; 1558 1559 WWAI(&t); 1560 1561 ret = WWL(&o, &t); 1562 WARN_ON(ret); 1563 WWL1(&o2); 1564 } 1565 1566 static void ww_test_context_try(void) 1567 { 1568 int ret; 1569 1570 WWAI(&t); 1571 1572 ret = WWL(&o, &t); 1573 WARN_ON(ret); 1574 1575 ret = WWT(&o2); 1576 WARN_ON(!ret); 1577 WWU(&o2); 1578 WWU(&o); 1579 } 1580 1581 static void ww_test_context_context(void) 1582 { 1583 int ret; 1584 1585 WWAI(&t); 1586 1587 ret = WWL(&o, &t); 1588 WARN_ON(ret); 1589 1590 ret = WWL(&o2, &t); 1591 WARN_ON(ret); 1592 1593 WWU(&o2); 1594 WWU(&o); 1595 } 1596 1597 static void ww_test_try_block(void) 1598 { 1599 bool ret; 1600 1601 ret = WWT(&o); 1602 WARN_ON(!ret); 1603 1604 WWL1(&o2); 1605 WWU(&o2); 1606 WWU(&o); 1607 } 1608 1609 static void ww_test_try_try(void) 1610 { 1611 bool ret; 1612 1613 ret = WWT(&o); 1614 WARN_ON(!ret); 1615 ret = WWT(&o2); 1616 WARN_ON(!ret); 1617 WWU(&o2); 1618 WWU(&o); 1619 } 1620 1621 static void ww_test_try_context(void) 1622 { 1623 int ret; 1624 1625 ret = WWT(&o); 1626 WARN_ON(!ret); 1627 1628 WWAI(&t); 1629 1630 ret = WWL(&o2, &t); 1631 WARN_ON(ret); 1632 } 1633 1634 static void ww_test_block_block(void) 1635 { 1636 WWL1(&o); 1637 WWL1(&o2); 1638 } 1639 1640 static void ww_test_block_try(void) 1641 { 1642 bool ret; 1643 1644 WWL1(&o); 1645 ret = WWT(&o2); 1646 WARN_ON(!ret); 1647 } 1648 1649 static void ww_test_block_context(void) 1650 { 1651 int ret; 1652 1653 WWL1(&o); 1654 WWAI(&t); 1655 1656 ret = WWL(&o2, &t); 1657 WARN_ON(ret); 1658 } 1659 1660 static void ww_test_spin_block(void) 1661 { 1662 L(A); 1663 U(A); 1664 1665 WWL1(&o); 1666 L(A); 1667 U(A); 1668 WWU(&o); 1669 1670 L(A); 1671 WWL1(&o); 1672 WWU(&o); 1673 U(A); 1674 } 1675 1676 static void ww_test_spin_try(void) 1677 { 1678 bool ret; 1679 1680 L(A); 1681 U(A); 1682 1683 ret = WWT(&o); 1684 WARN_ON(!ret); 1685 L(A); 1686 U(A); 1687 WWU(&o); 1688 1689 L(A); 1690 ret = WWT(&o); 1691 WARN_ON(!ret); 1692 WWU(&o); 1693 U(A); 1694 } 1695 1696 static void ww_test_spin_context(void) 1697 { 1698 int ret; 1699 1700 L(A); 1701 U(A); 1702 1703 WWAI(&t); 1704 1705 ret = WWL(&o, &t); 1706 WARN_ON(ret); 1707 L(A); 1708 U(A); 1709 WWU(&o); 1710 1711 L(A); 1712 ret = WWL(&o, &t); 1713 WARN_ON(ret); 1714 WWU(&o); 1715 U(A); 1716 } 1717 1718 static void ww_tests(void) 1719 { 1720 printk(" --------------------------------------------------------------------------\n"); 1721 printk(" | Wound/wait tests |\n"); 1722 printk(" ---------------------\n"); 1723 1724 print_testname("ww api failures"); 1725 dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW); 1726 dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW); 1727 dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW); 1728 printk("\n"); 1729 1730 print_testname("ww contexts mixing"); 1731 dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW); 1732 dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW); 1733 printk("\n"); 1734 1735 print_testname("finishing ww context"); 1736 dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW); 1737 dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW); 1738 dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW); 1739 dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW); 1740 printk("\n"); 1741 1742 print_testname("locking mismatches"); 1743 dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW); 1744 dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW); 1745 dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW); 1746 printk("\n"); 1747 1748 print_testname("EDEADLK handling"); 1749 dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW); 1750 dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW); 1751 dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW); 1752 dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW); 1753 dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW); 1754 dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW); 1755 dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW); 1756 dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW); 1757 dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW); 1758 dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW); 1759 printk("\n"); 1760 1761 print_testname("spinlock nest unlocked"); 1762 dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW); 1763 printk("\n"); 1764 1765 printk(" -----------------------------------------------------\n"); 1766 printk(" |block | try |context|\n"); 1767 printk(" -----------------------------------------------------\n"); 1768 1769 print_testname("context"); 1770 dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW); 1771 dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW); 1772 dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW); 1773 printk("\n"); 1774 1775 print_testname("try"); 1776 dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW); 1777 dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW); 1778 dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW); 1779 printk("\n"); 1780 1781 print_testname("block"); 1782 dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW); 1783 dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW); 1784 dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW); 1785 printk("\n"); 1786 1787 print_testname("spinlock"); 1788 dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW); 1789 dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW); 1790 dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW); 1791 printk("\n"); 1792 } 1793 1794 void locking_selftest(void) 1795 { 1796 /* 1797 * Got a locking failure before the selftest ran? 1798 */ 1799 if (!debug_locks) { 1800 printk("----------------------------------\n"); 1801 printk("| Locking API testsuite disabled |\n"); 1802 printk("----------------------------------\n"); 1803 return; 1804 } 1805 1806 /* 1807 * Run the testsuite: 1808 */ 1809 printk("------------------------\n"); 1810 printk("| Locking API testsuite:\n"); 1811 printk("----------------------------------------------------------------------------\n"); 1812 printk(" | spin |wlock |rlock |mutex | wsem | rsem |\n"); 1813 printk(" --------------------------------------------------------------------------\n"); 1814 1815 init_shared_classes(); 1816 debug_locks_silent = !debug_locks_verbose; 1817 1818 DO_TESTCASE_6R("A-A deadlock", AA); 1819 DO_TESTCASE_6R("A-B-B-A deadlock", ABBA); 1820 DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA); 1821 DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC); 1822 DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA); 1823 DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA); 1824 DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA); 1825 DO_TESTCASE_6("double unlock", double_unlock); 1826 DO_TESTCASE_6("initialize held", init_held); 1827 DO_TESTCASE_6_SUCCESS("bad unlock order", bad_unlock_order); 1828 1829 printk(" --------------------------------------------------------------------------\n"); 1830 print_testname("recursive read-lock"); 1831 printk(" |"); 1832 dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK); 1833 printk(" |"); 1834 dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM); 1835 printk("\n"); 1836 1837 print_testname("recursive read-lock #2"); 1838 printk(" |"); 1839 dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK); 1840 printk(" |"); 1841 dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM); 1842 printk("\n"); 1843 1844 print_testname("mixed read-write-lock"); 1845 printk(" |"); 1846 dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK); 1847 printk(" |"); 1848 dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM); 1849 printk("\n"); 1850 1851 print_testname("mixed write-read-lock"); 1852 printk(" |"); 1853 dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK); 1854 printk(" |"); 1855 dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM); 1856 printk("\n"); 1857 1858 printk(" --------------------------------------------------------------------------\n"); 1859 1860 /* 1861 * irq-context testcases: 1862 */ 1863 DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1); 1864 DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A); 1865 DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B); 1866 DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3); 1867 DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4); 1868 DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion); 1869 1870 DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion); 1871 // DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2); 1872 1873 ww_tests(); 1874 1875 if (unexpected_testcase_failures) { 1876 printk("-----------------------------------------------------------------\n"); 1877 debug_locks = 0; 1878 printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n", 1879 unexpected_testcase_failures, testcase_total); 1880 printk("-----------------------------------------------------------------\n"); 1881 } else if (expected_testcase_failures && testcase_successes) { 1882 printk("--------------------------------------------------------\n"); 1883 printk("%3d out of %3d testcases failed, as expected. |\n", 1884 expected_testcase_failures, testcase_total); 1885 printk("----------------------------------------------------\n"); 1886 debug_locks = 1; 1887 } else if (expected_testcase_failures && !testcase_successes) { 1888 printk("--------------------------------------------------------\n"); 1889 printk("All %3d testcases failed, as expected. |\n", 1890 expected_testcase_failures); 1891 printk("----------------------------------------\n"); 1892 debug_locks = 1; 1893 } else { 1894 printk("-------------------------------------------------------\n"); 1895 printk("Good, all %3d testcases passed! |\n", 1896 testcase_successes); 1897 printk("---------------------------------\n"); 1898 debug_locks = 1; 1899 } 1900 debug_locks_silent = 0; 1901 } 1902