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/ww_mutex.h> 16 #include <linux/sched.h> 17 #include <linux/delay.h> 18 #include <linux/lockdep.h> 19 #include <linux/spinlock.h> 20 #include <linux/kallsyms.h> 21 #include <linux/interrupt.h> 22 #include <linux/debug_locks.h> 23 #include <linux/irqflags.h> 24 25 /* 26 * Change this to 1 if you want to see the failure printouts: 27 */ 28 static unsigned int debug_locks_verbose; 29 30 static DEFINE_WW_CLASS(ww_lockdep); 31 32 static int __init setup_debug_locks_verbose(char *str) 33 { 34 get_option(&str, &debug_locks_verbose); 35 36 return 1; 37 } 38 39 __setup("debug_locks_verbose=", setup_debug_locks_verbose); 40 41 #define FAILURE 0 42 #define SUCCESS 1 43 44 #define LOCKTYPE_SPIN 0x1 45 #define LOCKTYPE_RWLOCK 0x2 46 #define LOCKTYPE_MUTEX 0x4 47 #define LOCKTYPE_RWSEM 0x8 48 #define LOCKTYPE_WW 0x10 49 50 static struct ww_acquire_ctx t, t2; 51 static struct ww_mutex o, o2, o3; 52 53 /* 54 * Normal standalone locks, for the circular and irq-context 55 * dependency tests: 56 */ 57 static DEFINE_RAW_SPINLOCK(lock_A); 58 static DEFINE_RAW_SPINLOCK(lock_B); 59 static DEFINE_RAW_SPINLOCK(lock_C); 60 static DEFINE_RAW_SPINLOCK(lock_D); 61 62 static DEFINE_RWLOCK(rwlock_A); 63 static DEFINE_RWLOCK(rwlock_B); 64 static DEFINE_RWLOCK(rwlock_C); 65 static DEFINE_RWLOCK(rwlock_D); 66 67 static DEFINE_MUTEX(mutex_A); 68 static DEFINE_MUTEX(mutex_B); 69 static DEFINE_MUTEX(mutex_C); 70 static DEFINE_MUTEX(mutex_D); 71 72 static DECLARE_RWSEM(rwsem_A); 73 static DECLARE_RWSEM(rwsem_B); 74 static DECLARE_RWSEM(rwsem_C); 75 static DECLARE_RWSEM(rwsem_D); 76 77 /* 78 * Locks that we initialize dynamically as well so that 79 * e.g. X1 and X2 becomes two instances of the same class, 80 * but X* and Y* are different classes. We do this so that 81 * we do not trigger a real lockup: 82 */ 83 static DEFINE_RAW_SPINLOCK(lock_X1); 84 static DEFINE_RAW_SPINLOCK(lock_X2); 85 static DEFINE_RAW_SPINLOCK(lock_Y1); 86 static DEFINE_RAW_SPINLOCK(lock_Y2); 87 static DEFINE_RAW_SPINLOCK(lock_Z1); 88 static DEFINE_RAW_SPINLOCK(lock_Z2); 89 90 static DEFINE_RWLOCK(rwlock_X1); 91 static DEFINE_RWLOCK(rwlock_X2); 92 static DEFINE_RWLOCK(rwlock_Y1); 93 static DEFINE_RWLOCK(rwlock_Y2); 94 static DEFINE_RWLOCK(rwlock_Z1); 95 static DEFINE_RWLOCK(rwlock_Z2); 96 97 static DEFINE_MUTEX(mutex_X1); 98 static DEFINE_MUTEX(mutex_X2); 99 static DEFINE_MUTEX(mutex_Y1); 100 static DEFINE_MUTEX(mutex_Y2); 101 static DEFINE_MUTEX(mutex_Z1); 102 static DEFINE_MUTEX(mutex_Z2); 103 104 static DECLARE_RWSEM(rwsem_X1); 105 static DECLARE_RWSEM(rwsem_X2); 106 static DECLARE_RWSEM(rwsem_Y1); 107 static DECLARE_RWSEM(rwsem_Y2); 108 static DECLARE_RWSEM(rwsem_Z1); 109 static DECLARE_RWSEM(rwsem_Z2); 110 111 /* 112 * non-inlined runtime initializers, to let separate locks share 113 * the same lock-class: 114 */ 115 #define INIT_CLASS_FUNC(class) \ 116 static noinline void \ 117 init_class_##class(raw_spinlock_t *lock, rwlock_t *rwlock, \ 118 struct mutex *mutex, struct rw_semaphore *rwsem)\ 119 { \ 120 raw_spin_lock_init(lock); \ 121 rwlock_init(rwlock); \ 122 mutex_init(mutex); \ 123 init_rwsem(rwsem); \ 124 } 125 126 INIT_CLASS_FUNC(X) 127 INIT_CLASS_FUNC(Y) 128 INIT_CLASS_FUNC(Z) 129 130 static void init_shared_classes(void) 131 { 132 init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1); 133 init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2); 134 135 init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1); 136 init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2); 137 138 init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1); 139 init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2); 140 } 141 142 /* 143 * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests. 144 * The following functions use a lock from a simulated hardirq/softirq 145 * context, causing the locks to be marked as hardirq-safe/softirq-safe: 146 */ 147 148 #define HARDIRQ_DISABLE local_irq_disable 149 #define HARDIRQ_ENABLE local_irq_enable 150 151 #define HARDIRQ_ENTER() \ 152 local_irq_disable(); \ 153 __irq_enter(); \ 154 WARN_ON(!in_irq()); 155 156 #define HARDIRQ_EXIT() \ 157 __irq_exit(); \ 158 local_irq_enable(); 159 160 #define SOFTIRQ_DISABLE local_bh_disable 161 #define SOFTIRQ_ENABLE local_bh_enable 162 163 #define SOFTIRQ_ENTER() \ 164 local_bh_disable(); \ 165 local_irq_disable(); \ 166 lockdep_softirq_enter(); \ 167 WARN_ON(!in_softirq()); 168 169 #define SOFTIRQ_EXIT() \ 170 lockdep_softirq_exit(); \ 171 local_irq_enable(); \ 172 local_bh_enable(); 173 174 /* 175 * Shortcuts for lock/unlock API variants, to keep 176 * the testcases compact: 177 */ 178 #define L(x) raw_spin_lock(&lock_##x) 179 #define U(x) raw_spin_unlock(&lock_##x) 180 #define LU(x) L(x); U(x) 181 #define SI(x) raw_spin_lock_init(&lock_##x) 182 183 #define WL(x) write_lock(&rwlock_##x) 184 #define WU(x) write_unlock(&rwlock_##x) 185 #define WLU(x) WL(x); WU(x) 186 187 #define RL(x) read_lock(&rwlock_##x) 188 #define RU(x) read_unlock(&rwlock_##x) 189 #define RLU(x) RL(x); RU(x) 190 #define RWI(x) rwlock_init(&rwlock_##x) 191 192 #define ML(x) mutex_lock(&mutex_##x) 193 #define MU(x) mutex_unlock(&mutex_##x) 194 #define MI(x) mutex_init(&mutex_##x) 195 196 #define WSL(x) down_write(&rwsem_##x) 197 #define WSU(x) up_write(&rwsem_##x) 198 199 #define RSL(x) down_read(&rwsem_##x) 200 #define RSU(x) up_read(&rwsem_##x) 201 #define RWSI(x) init_rwsem(&rwsem_##x) 202 203 #ifndef CONFIG_DEBUG_WW_MUTEX_SLOWPATH 204 #define WWAI(x) ww_acquire_init(x, &ww_lockdep) 205 #else 206 #define WWAI(x) do { ww_acquire_init(x, &ww_lockdep); (x)->deadlock_inject_countdown = ~0U; } while (0) 207 #endif 208 #define WWAD(x) ww_acquire_done(x) 209 #define WWAF(x) ww_acquire_fini(x) 210 211 #define WWL(x, c) ww_mutex_lock(x, c) 212 #define WWT(x) ww_mutex_trylock(x) 213 #define WWL1(x) ww_mutex_lock(x, NULL) 214 #define WWU(x) ww_mutex_unlock(x) 215 216 217 #define LOCK_UNLOCK_2(x,y) LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x) 218 219 /* 220 * Generate different permutations of the same testcase, using 221 * the same basic lock-dependency/state events: 222 */ 223 224 #define GENERATE_TESTCASE(name) \ 225 \ 226 static void name(void) { E(); } 227 228 #define GENERATE_PERMUTATIONS_2_EVENTS(name) \ 229 \ 230 static void name##_12(void) { E1(); E2(); } \ 231 static void name##_21(void) { E2(); E1(); } 232 233 #define GENERATE_PERMUTATIONS_3_EVENTS(name) \ 234 \ 235 static void name##_123(void) { E1(); E2(); E3(); } \ 236 static void name##_132(void) { E1(); E3(); E2(); } \ 237 static void name##_213(void) { E2(); E1(); E3(); } \ 238 static void name##_231(void) { E2(); E3(); E1(); } \ 239 static void name##_312(void) { E3(); E1(); E2(); } \ 240 static void name##_321(void) { E3(); E2(); E1(); } 241 242 /* 243 * AA deadlock: 244 */ 245 246 #define E() \ 247 \ 248 LOCK(X1); \ 249 LOCK(X2); /* this one should fail */ 250 251 /* 252 * 6 testcases: 253 */ 254 #include "locking-selftest-spin.h" 255 GENERATE_TESTCASE(AA_spin) 256 #include "locking-selftest-wlock.h" 257 GENERATE_TESTCASE(AA_wlock) 258 #include "locking-selftest-rlock.h" 259 GENERATE_TESTCASE(AA_rlock) 260 #include "locking-selftest-mutex.h" 261 GENERATE_TESTCASE(AA_mutex) 262 #include "locking-selftest-wsem.h" 263 GENERATE_TESTCASE(AA_wsem) 264 #include "locking-selftest-rsem.h" 265 GENERATE_TESTCASE(AA_rsem) 266 267 #undef E 268 269 /* 270 * Special-case for read-locking, they are 271 * allowed to recurse on the same lock class: 272 */ 273 static void rlock_AA1(void) 274 { 275 RL(X1); 276 RL(X1); // this one should NOT fail 277 } 278 279 static void rlock_AA1B(void) 280 { 281 RL(X1); 282 RL(X2); // this one should NOT fail 283 } 284 285 static void rsem_AA1(void) 286 { 287 RSL(X1); 288 RSL(X1); // this one should fail 289 } 290 291 static void rsem_AA1B(void) 292 { 293 RSL(X1); 294 RSL(X2); // this one should fail 295 } 296 /* 297 * The mixing of read and write locks is not allowed: 298 */ 299 static void rlock_AA2(void) 300 { 301 RL(X1); 302 WL(X2); // this one should fail 303 } 304 305 static void rsem_AA2(void) 306 { 307 RSL(X1); 308 WSL(X2); // this one should fail 309 } 310 311 static void rlock_AA3(void) 312 { 313 WL(X1); 314 RL(X2); // this one should fail 315 } 316 317 static void rsem_AA3(void) 318 { 319 WSL(X1); 320 RSL(X2); // this one should fail 321 } 322 323 /* 324 * ABBA deadlock: 325 */ 326 327 #define E() \ 328 \ 329 LOCK_UNLOCK_2(A, B); \ 330 LOCK_UNLOCK_2(B, A); /* fail */ 331 332 /* 333 * 6 testcases: 334 */ 335 #include "locking-selftest-spin.h" 336 GENERATE_TESTCASE(ABBA_spin) 337 #include "locking-selftest-wlock.h" 338 GENERATE_TESTCASE(ABBA_wlock) 339 #include "locking-selftest-rlock.h" 340 GENERATE_TESTCASE(ABBA_rlock) 341 #include "locking-selftest-mutex.h" 342 GENERATE_TESTCASE(ABBA_mutex) 343 #include "locking-selftest-wsem.h" 344 GENERATE_TESTCASE(ABBA_wsem) 345 #include "locking-selftest-rsem.h" 346 GENERATE_TESTCASE(ABBA_rsem) 347 348 #undef E 349 350 /* 351 * AB BC CA deadlock: 352 */ 353 354 #define E() \ 355 \ 356 LOCK_UNLOCK_2(A, B); \ 357 LOCK_UNLOCK_2(B, C); \ 358 LOCK_UNLOCK_2(C, A); /* fail */ 359 360 /* 361 * 6 testcases: 362 */ 363 #include "locking-selftest-spin.h" 364 GENERATE_TESTCASE(ABBCCA_spin) 365 #include "locking-selftest-wlock.h" 366 GENERATE_TESTCASE(ABBCCA_wlock) 367 #include "locking-selftest-rlock.h" 368 GENERATE_TESTCASE(ABBCCA_rlock) 369 #include "locking-selftest-mutex.h" 370 GENERATE_TESTCASE(ABBCCA_mutex) 371 #include "locking-selftest-wsem.h" 372 GENERATE_TESTCASE(ABBCCA_wsem) 373 #include "locking-selftest-rsem.h" 374 GENERATE_TESTCASE(ABBCCA_rsem) 375 376 #undef E 377 378 /* 379 * AB CA BC deadlock: 380 */ 381 382 #define E() \ 383 \ 384 LOCK_UNLOCK_2(A, B); \ 385 LOCK_UNLOCK_2(C, A); \ 386 LOCK_UNLOCK_2(B, C); /* fail */ 387 388 /* 389 * 6 testcases: 390 */ 391 #include "locking-selftest-spin.h" 392 GENERATE_TESTCASE(ABCABC_spin) 393 #include "locking-selftest-wlock.h" 394 GENERATE_TESTCASE(ABCABC_wlock) 395 #include "locking-selftest-rlock.h" 396 GENERATE_TESTCASE(ABCABC_rlock) 397 #include "locking-selftest-mutex.h" 398 GENERATE_TESTCASE(ABCABC_mutex) 399 #include "locking-selftest-wsem.h" 400 GENERATE_TESTCASE(ABCABC_wsem) 401 #include "locking-selftest-rsem.h" 402 GENERATE_TESTCASE(ABCABC_rsem) 403 404 #undef E 405 406 /* 407 * AB BC CD DA deadlock: 408 */ 409 410 #define E() \ 411 \ 412 LOCK_UNLOCK_2(A, B); \ 413 LOCK_UNLOCK_2(B, C); \ 414 LOCK_UNLOCK_2(C, D); \ 415 LOCK_UNLOCK_2(D, A); /* fail */ 416 417 /* 418 * 6 testcases: 419 */ 420 #include "locking-selftest-spin.h" 421 GENERATE_TESTCASE(ABBCCDDA_spin) 422 #include "locking-selftest-wlock.h" 423 GENERATE_TESTCASE(ABBCCDDA_wlock) 424 #include "locking-selftest-rlock.h" 425 GENERATE_TESTCASE(ABBCCDDA_rlock) 426 #include "locking-selftest-mutex.h" 427 GENERATE_TESTCASE(ABBCCDDA_mutex) 428 #include "locking-selftest-wsem.h" 429 GENERATE_TESTCASE(ABBCCDDA_wsem) 430 #include "locking-selftest-rsem.h" 431 GENERATE_TESTCASE(ABBCCDDA_rsem) 432 433 #undef E 434 435 /* 436 * AB CD BD DA deadlock: 437 */ 438 #define E() \ 439 \ 440 LOCK_UNLOCK_2(A, B); \ 441 LOCK_UNLOCK_2(C, D); \ 442 LOCK_UNLOCK_2(B, D); \ 443 LOCK_UNLOCK_2(D, A); /* fail */ 444 445 /* 446 * 6 testcases: 447 */ 448 #include "locking-selftest-spin.h" 449 GENERATE_TESTCASE(ABCDBDDA_spin) 450 #include "locking-selftest-wlock.h" 451 GENERATE_TESTCASE(ABCDBDDA_wlock) 452 #include "locking-selftest-rlock.h" 453 GENERATE_TESTCASE(ABCDBDDA_rlock) 454 #include "locking-selftest-mutex.h" 455 GENERATE_TESTCASE(ABCDBDDA_mutex) 456 #include "locking-selftest-wsem.h" 457 GENERATE_TESTCASE(ABCDBDDA_wsem) 458 #include "locking-selftest-rsem.h" 459 GENERATE_TESTCASE(ABCDBDDA_rsem) 460 461 #undef E 462 463 /* 464 * AB CD BC DA deadlock: 465 */ 466 #define E() \ 467 \ 468 LOCK_UNLOCK_2(A, B); \ 469 LOCK_UNLOCK_2(C, D); \ 470 LOCK_UNLOCK_2(B, C); \ 471 LOCK_UNLOCK_2(D, A); /* fail */ 472 473 /* 474 * 6 testcases: 475 */ 476 #include "locking-selftest-spin.h" 477 GENERATE_TESTCASE(ABCDBCDA_spin) 478 #include "locking-selftest-wlock.h" 479 GENERATE_TESTCASE(ABCDBCDA_wlock) 480 #include "locking-selftest-rlock.h" 481 GENERATE_TESTCASE(ABCDBCDA_rlock) 482 #include "locking-selftest-mutex.h" 483 GENERATE_TESTCASE(ABCDBCDA_mutex) 484 #include "locking-selftest-wsem.h" 485 GENERATE_TESTCASE(ABCDBCDA_wsem) 486 #include "locking-selftest-rsem.h" 487 GENERATE_TESTCASE(ABCDBCDA_rsem) 488 489 #undef E 490 491 /* 492 * Double unlock: 493 */ 494 #define E() \ 495 \ 496 LOCK(A); \ 497 UNLOCK(A); \ 498 UNLOCK(A); /* fail */ 499 500 /* 501 * 6 testcases: 502 */ 503 #include "locking-selftest-spin.h" 504 GENERATE_TESTCASE(double_unlock_spin) 505 #include "locking-selftest-wlock.h" 506 GENERATE_TESTCASE(double_unlock_wlock) 507 #include "locking-selftest-rlock.h" 508 GENERATE_TESTCASE(double_unlock_rlock) 509 #include "locking-selftest-mutex.h" 510 GENERATE_TESTCASE(double_unlock_mutex) 511 #include "locking-selftest-wsem.h" 512 GENERATE_TESTCASE(double_unlock_wsem) 513 #include "locking-selftest-rsem.h" 514 GENERATE_TESTCASE(double_unlock_rsem) 515 516 #undef E 517 518 /* 519 * Bad unlock ordering: 520 */ 521 #define E() \ 522 \ 523 LOCK(A); \ 524 LOCK(B); \ 525 UNLOCK(A); /* fail */ \ 526 UNLOCK(B); 527 528 /* 529 * 6 testcases: 530 */ 531 #include "locking-selftest-spin.h" 532 GENERATE_TESTCASE(bad_unlock_order_spin) 533 #include "locking-selftest-wlock.h" 534 GENERATE_TESTCASE(bad_unlock_order_wlock) 535 #include "locking-selftest-rlock.h" 536 GENERATE_TESTCASE(bad_unlock_order_rlock) 537 #include "locking-selftest-mutex.h" 538 GENERATE_TESTCASE(bad_unlock_order_mutex) 539 #include "locking-selftest-wsem.h" 540 GENERATE_TESTCASE(bad_unlock_order_wsem) 541 #include "locking-selftest-rsem.h" 542 GENERATE_TESTCASE(bad_unlock_order_rsem) 543 544 #undef E 545 546 /* 547 * initializing a held lock: 548 */ 549 #define E() \ 550 \ 551 LOCK(A); \ 552 INIT(A); /* fail */ 553 554 /* 555 * 6 testcases: 556 */ 557 #include "locking-selftest-spin.h" 558 GENERATE_TESTCASE(init_held_spin) 559 #include "locking-selftest-wlock.h" 560 GENERATE_TESTCASE(init_held_wlock) 561 #include "locking-selftest-rlock.h" 562 GENERATE_TESTCASE(init_held_rlock) 563 #include "locking-selftest-mutex.h" 564 GENERATE_TESTCASE(init_held_mutex) 565 #include "locking-selftest-wsem.h" 566 GENERATE_TESTCASE(init_held_wsem) 567 #include "locking-selftest-rsem.h" 568 GENERATE_TESTCASE(init_held_rsem) 569 570 #undef E 571 572 /* 573 * locking an irq-safe lock with irqs enabled: 574 */ 575 #define E1() \ 576 \ 577 IRQ_ENTER(); \ 578 LOCK(A); \ 579 UNLOCK(A); \ 580 IRQ_EXIT(); 581 582 #define E2() \ 583 \ 584 LOCK(A); \ 585 UNLOCK(A); 586 587 /* 588 * Generate 24 testcases: 589 */ 590 #include "locking-selftest-spin-hardirq.h" 591 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin) 592 593 #include "locking-selftest-rlock-hardirq.h" 594 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock) 595 596 #include "locking-selftest-wlock-hardirq.h" 597 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock) 598 599 #include "locking-selftest-spin-softirq.h" 600 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin) 601 602 #include "locking-selftest-rlock-softirq.h" 603 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock) 604 605 #include "locking-selftest-wlock-softirq.h" 606 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock) 607 608 #undef E1 609 #undef E2 610 611 /* 612 * Enabling hardirqs with a softirq-safe lock held: 613 */ 614 #define E1() \ 615 \ 616 SOFTIRQ_ENTER(); \ 617 LOCK(A); \ 618 UNLOCK(A); \ 619 SOFTIRQ_EXIT(); 620 621 #define E2() \ 622 \ 623 HARDIRQ_DISABLE(); \ 624 LOCK(A); \ 625 HARDIRQ_ENABLE(); \ 626 UNLOCK(A); 627 628 /* 629 * Generate 12 testcases: 630 */ 631 #include "locking-selftest-spin.h" 632 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin) 633 634 #include "locking-selftest-wlock.h" 635 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock) 636 637 #include "locking-selftest-rlock.h" 638 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock) 639 640 #undef E1 641 #undef E2 642 643 /* 644 * Enabling irqs with an irq-safe lock held: 645 */ 646 #define E1() \ 647 \ 648 IRQ_ENTER(); \ 649 LOCK(A); \ 650 UNLOCK(A); \ 651 IRQ_EXIT(); 652 653 #define E2() \ 654 \ 655 IRQ_DISABLE(); \ 656 LOCK(A); \ 657 IRQ_ENABLE(); \ 658 UNLOCK(A); 659 660 /* 661 * Generate 24 testcases: 662 */ 663 #include "locking-selftest-spin-hardirq.h" 664 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin) 665 666 #include "locking-selftest-rlock-hardirq.h" 667 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock) 668 669 #include "locking-selftest-wlock-hardirq.h" 670 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock) 671 672 #include "locking-selftest-spin-softirq.h" 673 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin) 674 675 #include "locking-selftest-rlock-softirq.h" 676 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock) 677 678 #include "locking-selftest-wlock-softirq.h" 679 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock) 680 681 #undef E1 682 #undef E2 683 684 /* 685 * Acquiring a irq-unsafe lock while holding an irq-safe-lock: 686 */ 687 #define E1() \ 688 \ 689 LOCK(A); \ 690 LOCK(B); \ 691 UNLOCK(B); \ 692 UNLOCK(A); \ 693 694 #define E2() \ 695 \ 696 LOCK(B); \ 697 UNLOCK(B); 698 699 #define E3() \ 700 \ 701 IRQ_ENTER(); \ 702 LOCK(A); \ 703 UNLOCK(A); \ 704 IRQ_EXIT(); 705 706 /* 707 * Generate 36 testcases: 708 */ 709 #include "locking-selftest-spin-hardirq.h" 710 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin) 711 712 #include "locking-selftest-rlock-hardirq.h" 713 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock) 714 715 #include "locking-selftest-wlock-hardirq.h" 716 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock) 717 718 #include "locking-selftest-spin-softirq.h" 719 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin) 720 721 #include "locking-selftest-rlock-softirq.h" 722 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock) 723 724 #include "locking-selftest-wlock-softirq.h" 725 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock) 726 727 #undef E1 728 #undef E2 729 #undef E3 730 731 /* 732 * If a lock turns into softirq-safe, but earlier it took 733 * a softirq-unsafe lock: 734 */ 735 736 #define E1() \ 737 IRQ_DISABLE(); \ 738 LOCK(A); \ 739 LOCK(B); \ 740 UNLOCK(B); \ 741 UNLOCK(A); \ 742 IRQ_ENABLE(); 743 744 #define E2() \ 745 LOCK(B); \ 746 UNLOCK(B); 747 748 #define E3() \ 749 IRQ_ENTER(); \ 750 LOCK(A); \ 751 UNLOCK(A); \ 752 IRQ_EXIT(); 753 754 /* 755 * Generate 36 testcases: 756 */ 757 #include "locking-selftest-spin-hardirq.h" 758 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin) 759 760 #include "locking-selftest-rlock-hardirq.h" 761 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock) 762 763 #include "locking-selftest-wlock-hardirq.h" 764 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock) 765 766 #include "locking-selftest-spin-softirq.h" 767 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin) 768 769 #include "locking-selftest-rlock-softirq.h" 770 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock) 771 772 #include "locking-selftest-wlock-softirq.h" 773 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock) 774 775 #undef E1 776 #undef E2 777 #undef E3 778 779 /* 780 * read-lock / write-lock irq inversion. 781 * 782 * Deadlock scenario: 783 * 784 * CPU#1 is at #1, i.e. it has write-locked A, but has not 785 * taken B yet. 786 * 787 * CPU#2 is at #2, i.e. it has locked B. 788 * 789 * Hardirq hits CPU#2 at point #2 and is trying to read-lock A. 790 * 791 * The deadlock occurs because CPU#1 will spin on B, and CPU#2 792 * will spin on A. 793 */ 794 795 #define E1() \ 796 \ 797 IRQ_DISABLE(); \ 798 WL(A); \ 799 LOCK(B); \ 800 UNLOCK(B); \ 801 WU(A); \ 802 IRQ_ENABLE(); 803 804 #define E2() \ 805 \ 806 LOCK(B); \ 807 UNLOCK(B); 808 809 #define E3() \ 810 \ 811 IRQ_ENTER(); \ 812 RL(A); \ 813 RU(A); \ 814 IRQ_EXIT(); 815 816 /* 817 * Generate 36 testcases: 818 */ 819 #include "locking-selftest-spin-hardirq.h" 820 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin) 821 822 #include "locking-selftest-rlock-hardirq.h" 823 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock) 824 825 #include "locking-selftest-wlock-hardirq.h" 826 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock) 827 828 #include "locking-selftest-spin-softirq.h" 829 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin) 830 831 #include "locking-selftest-rlock-softirq.h" 832 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock) 833 834 #include "locking-selftest-wlock-softirq.h" 835 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock) 836 837 #undef E1 838 #undef E2 839 #undef E3 840 841 /* 842 * read-lock / write-lock recursion that is actually safe. 843 */ 844 845 #define E1() \ 846 \ 847 IRQ_DISABLE(); \ 848 WL(A); \ 849 WU(A); \ 850 IRQ_ENABLE(); 851 852 #define E2() \ 853 \ 854 RL(A); \ 855 RU(A); \ 856 857 #define E3() \ 858 \ 859 IRQ_ENTER(); \ 860 RL(A); \ 861 L(B); \ 862 U(B); \ 863 RU(A); \ 864 IRQ_EXIT(); 865 866 /* 867 * Generate 12 testcases: 868 */ 869 #include "locking-selftest-hardirq.h" 870 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard) 871 872 #include "locking-selftest-softirq.h" 873 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft) 874 875 #undef E1 876 #undef E2 877 #undef E3 878 879 /* 880 * read-lock / write-lock recursion that is unsafe. 881 */ 882 883 #define E1() \ 884 \ 885 IRQ_DISABLE(); \ 886 L(B); \ 887 WL(A); \ 888 WU(A); \ 889 U(B); \ 890 IRQ_ENABLE(); 891 892 #define E2() \ 893 \ 894 RL(A); \ 895 RU(A); \ 896 897 #define E3() \ 898 \ 899 IRQ_ENTER(); \ 900 L(B); \ 901 U(B); \ 902 IRQ_EXIT(); 903 904 /* 905 * Generate 12 testcases: 906 */ 907 #include "locking-selftest-hardirq.h" 908 // GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard) 909 910 #include "locking-selftest-softirq.h" 911 // GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft) 912 913 #ifdef CONFIG_DEBUG_LOCK_ALLOC 914 # define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map) 915 # define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map) 916 # define I_MUTEX(x) lockdep_reset_lock(&mutex_##x.dep_map) 917 # define I_RWSEM(x) lockdep_reset_lock(&rwsem_##x.dep_map) 918 # define I_WW(x) lockdep_reset_lock(&x.dep_map) 919 #else 920 # define I_SPINLOCK(x) 921 # define I_RWLOCK(x) 922 # define I_MUTEX(x) 923 # define I_RWSEM(x) 924 # define I_WW(x) 925 #endif 926 927 #define I1(x) \ 928 do { \ 929 I_SPINLOCK(x); \ 930 I_RWLOCK(x); \ 931 I_MUTEX(x); \ 932 I_RWSEM(x); \ 933 } while (0) 934 935 #define I2(x) \ 936 do { \ 937 raw_spin_lock_init(&lock_##x); \ 938 rwlock_init(&rwlock_##x); \ 939 mutex_init(&mutex_##x); \ 940 init_rwsem(&rwsem_##x); \ 941 } while (0) 942 943 static void reset_locks(void) 944 { 945 local_irq_disable(); 946 lockdep_free_key_range(&ww_lockdep.acquire_key, 1); 947 lockdep_free_key_range(&ww_lockdep.mutex_key, 1); 948 949 I1(A); I1(B); I1(C); I1(D); 950 I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2); 951 I_WW(t); I_WW(t2); I_WW(o.base); I_WW(o2.base); I_WW(o3.base); 952 lockdep_reset(); 953 I2(A); I2(B); I2(C); I2(D); 954 init_shared_classes(); 955 956 ww_mutex_init(&o, &ww_lockdep); ww_mutex_init(&o2, &ww_lockdep); ww_mutex_init(&o3, &ww_lockdep); 957 memset(&t, 0, sizeof(t)); memset(&t2, 0, sizeof(t2)); 958 memset(&ww_lockdep.acquire_key, 0, sizeof(ww_lockdep.acquire_key)); 959 memset(&ww_lockdep.mutex_key, 0, sizeof(ww_lockdep.mutex_key)); 960 local_irq_enable(); 961 } 962 963 #undef I 964 965 static int testcase_total; 966 static int testcase_successes; 967 static int expected_testcase_failures; 968 static int unexpected_testcase_failures; 969 970 static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask) 971 { 972 unsigned long saved_preempt_count = preempt_count(); 973 974 WARN_ON(irqs_disabled()); 975 976 testcase_fn(); 977 /* 978 * Filter out expected failures: 979 */ 980 #ifndef CONFIG_PROVE_LOCKING 981 if (expected == FAILURE && debug_locks) { 982 expected_testcase_failures++; 983 printk("failed|"); 984 } 985 else 986 #endif 987 if (debug_locks != expected) { 988 unexpected_testcase_failures++; 989 printk("FAILED|"); 990 991 dump_stack(); 992 } else { 993 testcase_successes++; 994 printk(" ok |"); 995 } 996 testcase_total++; 997 998 if (debug_locks_verbose) 999 printk(" lockclass mask: %x, debug_locks: %d, expected: %d\n", 1000 lockclass_mask, debug_locks, expected); 1001 /* 1002 * Some tests (e.g. double-unlock) might corrupt the preemption 1003 * count, so restore it: 1004 */ 1005 preempt_count_set(saved_preempt_count); 1006 #ifdef CONFIG_TRACE_IRQFLAGS 1007 if (softirq_count()) 1008 current->softirqs_enabled = 0; 1009 else 1010 current->softirqs_enabled = 1; 1011 #endif 1012 1013 reset_locks(); 1014 } 1015 1016 static inline void print_testname(const char *testname) 1017 { 1018 printk("%33s:", testname); 1019 } 1020 1021 #define DO_TESTCASE_1(desc, name, nr) \ 1022 print_testname(desc"/"#nr); \ 1023 dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ 1024 printk("\n"); 1025 1026 #define DO_TESTCASE_1B(desc, name, nr) \ 1027 print_testname(desc"/"#nr); \ 1028 dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \ 1029 printk("\n"); 1030 1031 #define DO_TESTCASE_3(desc, name, nr) \ 1032 print_testname(desc"/"#nr); \ 1033 dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \ 1034 dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ 1035 dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ 1036 printk("\n"); 1037 1038 #define DO_TESTCASE_3RW(desc, name, nr) \ 1039 print_testname(desc"/"#nr); \ 1040 dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\ 1041 dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ 1042 dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ 1043 printk("\n"); 1044 1045 #define DO_TESTCASE_6(desc, name) \ 1046 print_testname(desc); \ 1047 dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ 1048 dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ 1049 dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK); \ 1050 dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ 1051 dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ 1052 dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ 1053 printk("\n"); 1054 1055 #define DO_TESTCASE_6_SUCCESS(desc, name) \ 1056 print_testname(desc); \ 1057 dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN); \ 1058 dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK); \ 1059 dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ 1060 dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX); \ 1061 dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM); \ 1062 dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM); \ 1063 printk("\n"); 1064 1065 /* 1066 * 'read' variant: rlocks must not trigger. 1067 */ 1068 #define DO_TESTCASE_6R(desc, name) \ 1069 print_testname(desc); \ 1070 dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ 1071 dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ 1072 dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ 1073 dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ 1074 dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ 1075 dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ 1076 printk("\n"); 1077 1078 #define DO_TESTCASE_2I(desc, name, nr) \ 1079 DO_TESTCASE_1("hard-"desc, name##_hard, nr); \ 1080 DO_TESTCASE_1("soft-"desc, name##_soft, nr); 1081 1082 #define DO_TESTCASE_2IB(desc, name, nr) \ 1083 DO_TESTCASE_1B("hard-"desc, name##_hard, nr); \ 1084 DO_TESTCASE_1B("soft-"desc, name##_soft, nr); 1085 1086 #define DO_TESTCASE_6I(desc, name, nr) \ 1087 DO_TESTCASE_3("hard-"desc, name##_hard, nr); \ 1088 DO_TESTCASE_3("soft-"desc, name##_soft, nr); 1089 1090 #define DO_TESTCASE_6IRW(desc, name, nr) \ 1091 DO_TESTCASE_3RW("hard-"desc, name##_hard, nr); \ 1092 DO_TESTCASE_3RW("soft-"desc, name##_soft, nr); 1093 1094 #define DO_TESTCASE_2x3(desc, name) \ 1095 DO_TESTCASE_3(desc, name, 12); \ 1096 DO_TESTCASE_3(desc, name, 21); 1097 1098 #define DO_TESTCASE_2x6(desc, name) \ 1099 DO_TESTCASE_6I(desc, name, 12); \ 1100 DO_TESTCASE_6I(desc, name, 21); 1101 1102 #define DO_TESTCASE_6x2(desc, name) \ 1103 DO_TESTCASE_2I(desc, name, 123); \ 1104 DO_TESTCASE_2I(desc, name, 132); \ 1105 DO_TESTCASE_2I(desc, name, 213); \ 1106 DO_TESTCASE_2I(desc, name, 231); \ 1107 DO_TESTCASE_2I(desc, name, 312); \ 1108 DO_TESTCASE_2I(desc, name, 321); 1109 1110 #define DO_TESTCASE_6x2B(desc, name) \ 1111 DO_TESTCASE_2IB(desc, name, 123); \ 1112 DO_TESTCASE_2IB(desc, name, 132); \ 1113 DO_TESTCASE_2IB(desc, name, 213); \ 1114 DO_TESTCASE_2IB(desc, name, 231); \ 1115 DO_TESTCASE_2IB(desc, name, 312); \ 1116 DO_TESTCASE_2IB(desc, name, 321); 1117 1118 #define DO_TESTCASE_6x6(desc, name) \ 1119 DO_TESTCASE_6I(desc, name, 123); \ 1120 DO_TESTCASE_6I(desc, name, 132); \ 1121 DO_TESTCASE_6I(desc, name, 213); \ 1122 DO_TESTCASE_6I(desc, name, 231); \ 1123 DO_TESTCASE_6I(desc, name, 312); \ 1124 DO_TESTCASE_6I(desc, name, 321); 1125 1126 #define DO_TESTCASE_6x6RW(desc, name) \ 1127 DO_TESTCASE_6IRW(desc, name, 123); \ 1128 DO_TESTCASE_6IRW(desc, name, 132); \ 1129 DO_TESTCASE_6IRW(desc, name, 213); \ 1130 DO_TESTCASE_6IRW(desc, name, 231); \ 1131 DO_TESTCASE_6IRW(desc, name, 312); \ 1132 DO_TESTCASE_6IRW(desc, name, 321); 1133 1134 static void ww_test_fail_acquire(void) 1135 { 1136 int ret; 1137 1138 WWAI(&t); 1139 t.stamp++; 1140 1141 ret = WWL(&o, &t); 1142 1143 if (WARN_ON(!o.ctx) || 1144 WARN_ON(ret)) 1145 return; 1146 1147 /* No lockdep test, pure API */ 1148 ret = WWL(&o, &t); 1149 WARN_ON(ret != -EALREADY); 1150 1151 ret = WWT(&o); 1152 WARN_ON(ret); 1153 1154 t2 = t; 1155 t2.stamp++; 1156 ret = WWL(&o, &t2); 1157 WARN_ON(ret != -EDEADLK); 1158 WWU(&o); 1159 1160 if (WWT(&o)) 1161 WWU(&o); 1162 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1163 else 1164 DEBUG_LOCKS_WARN_ON(1); 1165 #endif 1166 } 1167 1168 static void ww_test_normal(void) 1169 { 1170 int ret; 1171 1172 WWAI(&t); 1173 1174 /* 1175 * None of the ww_mutex codepaths should be taken in the 'normal' 1176 * mutex calls. The easiest way to verify this is by using the 1177 * normal mutex calls, and making sure o.ctx is unmodified. 1178 */ 1179 1180 /* mutex_lock (and indirectly, mutex_lock_nested) */ 1181 o.ctx = (void *)~0UL; 1182 mutex_lock(&o.base); 1183 mutex_unlock(&o.base); 1184 WARN_ON(o.ctx != (void *)~0UL); 1185 1186 /* mutex_lock_interruptible (and *_nested) */ 1187 o.ctx = (void *)~0UL; 1188 ret = mutex_lock_interruptible(&o.base); 1189 if (!ret) 1190 mutex_unlock(&o.base); 1191 else 1192 WARN_ON(1); 1193 WARN_ON(o.ctx != (void *)~0UL); 1194 1195 /* mutex_lock_killable (and *_nested) */ 1196 o.ctx = (void *)~0UL; 1197 ret = mutex_lock_killable(&o.base); 1198 if (!ret) 1199 mutex_unlock(&o.base); 1200 else 1201 WARN_ON(1); 1202 WARN_ON(o.ctx != (void *)~0UL); 1203 1204 /* trylock, succeeding */ 1205 o.ctx = (void *)~0UL; 1206 ret = mutex_trylock(&o.base); 1207 WARN_ON(!ret); 1208 if (ret) 1209 mutex_unlock(&o.base); 1210 else 1211 WARN_ON(1); 1212 WARN_ON(o.ctx != (void *)~0UL); 1213 1214 /* trylock, failing */ 1215 o.ctx = (void *)~0UL; 1216 mutex_lock(&o.base); 1217 ret = mutex_trylock(&o.base); 1218 WARN_ON(ret); 1219 mutex_unlock(&o.base); 1220 WARN_ON(o.ctx != (void *)~0UL); 1221 1222 /* nest_lock */ 1223 o.ctx = (void *)~0UL; 1224 mutex_lock_nest_lock(&o.base, &t); 1225 mutex_unlock(&o.base); 1226 WARN_ON(o.ctx != (void *)~0UL); 1227 } 1228 1229 static void ww_test_two_contexts(void) 1230 { 1231 WWAI(&t); 1232 WWAI(&t2); 1233 } 1234 1235 static void ww_test_diff_class(void) 1236 { 1237 WWAI(&t); 1238 #ifdef CONFIG_DEBUG_MUTEXES 1239 t.ww_class = NULL; 1240 #endif 1241 WWL(&o, &t); 1242 } 1243 1244 static void ww_test_context_done_twice(void) 1245 { 1246 WWAI(&t); 1247 WWAD(&t); 1248 WWAD(&t); 1249 WWAF(&t); 1250 } 1251 1252 static void ww_test_context_unlock_twice(void) 1253 { 1254 WWAI(&t); 1255 WWAD(&t); 1256 WWAF(&t); 1257 WWAF(&t); 1258 } 1259 1260 static void ww_test_context_fini_early(void) 1261 { 1262 WWAI(&t); 1263 WWL(&o, &t); 1264 WWAD(&t); 1265 WWAF(&t); 1266 } 1267 1268 static void ww_test_context_lock_after_done(void) 1269 { 1270 WWAI(&t); 1271 WWAD(&t); 1272 WWL(&o, &t); 1273 } 1274 1275 static void ww_test_object_unlock_twice(void) 1276 { 1277 WWL1(&o); 1278 WWU(&o); 1279 WWU(&o); 1280 } 1281 1282 static void ww_test_object_lock_unbalanced(void) 1283 { 1284 WWAI(&t); 1285 WWL(&o, &t); 1286 t.acquired = 0; 1287 WWU(&o); 1288 WWAF(&t); 1289 } 1290 1291 static void ww_test_object_lock_stale_context(void) 1292 { 1293 WWAI(&t); 1294 o.ctx = &t2; 1295 WWL(&o, &t); 1296 } 1297 1298 static void ww_test_edeadlk_normal(void) 1299 { 1300 int ret; 1301 1302 mutex_lock(&o2.base); 1303 o2.ctx = &t2; 1304 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1305 1306 WWAI(&t); 1307 t2 = t; 1308 t2.stamp--; 1309 1310 ret = WWL(&o, &t); 1311 WARN_ON(ret); 1312 1313 ret = WWL(&o2, &t); 1314 WARN_ON(ret != -EDEADLK); 1315 1316 o2.ctx = NULL; 1317 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); 1318 mutex_unlock(&o2.base); 1319 WWU(&o); 1320 1321 WWL(&o2, &t); 1322 } 1323 1324 static void ww_test_edeadlk_normal_slow(void) 1325 { 1326 int ret; 1327 1328 mutex_lock(&o2.base); 1329 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1330 o2.ctx = &t2; 1331 1332 WWAI(&t); 1333 t2 = t; 1334 t2.stamp--; 1335 1336 ret = WWL(&o, &t); 1337 WARN_ON(ret); 1338 1339 ret = WWL(&o2, &t); 1340 WARN_ON(ret != -EDEADLK); 1341 1342 o2.ctx = NULL; 1343 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); 1344 mutex_unlock(&o2.base); 1345 WWU(&o); 1346 1347 ww_mutex_lock_slow(&o2, &t); 1348 } 1349 1350 static void ww_test_edeadlk_no_unlock(void) 1351 { 1352 int ret; 1353 1354 mutex_lock(&o2.base); 1355 o2.ctx = &t2; 1356 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1357 1358 WWAI(&t); 1359 t2 = t; 1360 t2.stamp--; 1361 1362 ret = WWL(&o, &t); 1363 WARN_ON(ret); 1364 1365 ret = WWL(&o2, &t); 1366 WARN_ON(ret != -EDEADLK); 1367 1368 o2.ctx = NULL; 1369 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); 1370 mutex_unlock(&o2.base); 1371 1372 WWL(&o2, &t); 1373 } 1374 1375 static void ww_test_edeadlk_no_unlock_slow(void) 1376 { 1377 int ret; 1378 1379 mutex_lock(&o2.base); 1380 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1381 o2.ctx = &t2; 1382 1383 WWAI(&t); 1384 t2 = t; 1385 t2.stamp--; 1386 1387 ret = WWL(&o, &t); 1388 WARN_ON(ret); 1389 1390 ret = WWL(&o2, &t); 1391 WARN_ON(ret != -EDEADLK); 1392 1393 o2.ctx = NULL; 1394 mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); 1395 mutex_unlock(&o2.base); 1396 1397 ww_mutex_lock_slow(&o2, &t); 1398 } 1399 1400 static void ww_test_edeadlk_acquire_more(void) 1401 { 1402 int ret; 1403 1404 mutex_lock(&o2.base); 1405 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1406 o2.ctx = &t2; 1407 1408 WWAI(&t); 1409 t2 = t; 1410 t2.stamp--; 1411 1412 ret = WWL(&o, &t); 1413 WARN_ON(ret); 1414 1415 ret = WWL(&o2, &t); 1416 WARN_ON(ret != -EDEADLK); 1417 1418 ret = WWL(&o3, &t); 1419 } 1420 1421 static void ww_test_edeadlk_acquire_more_slow(void) 1422 { 1423 int ret; 1424 1425 mutex_lock(&o2.base); 1426 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1427 o2.ctx = &t2; 1428 1429 WWAI(&t); 1430 t2 = t; 1431 t2.stamp--; 1432 1433 ret = WWL(&o, &t); 1434 WARN_ON(ret); 1435 1436 ret = WWL(&o2, &t); 1437 WARN_ON(ret != -EDEADLK); 1438 1439 ww_mutex_lock_slow(&o3, &t); 1440 } 1441 1442 static void ww_test_edeadlk_acquire_more_edeadlk(void) 1443 { 1444 int ret; 1445 1446 mutex_lock(&o2.base); 1447 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1448 o2.ctx = &t2; 1449 1450 mutex_lock(&o3.base); 1451 mutex_release(&o3.base.dep_map, 1, _THIS_IP_); 1452 o3.ctx = &t2; 1453 1454 WWAI(&t); 1455 t2 = t; 1456 t2.stamp--; 1457 1458 ret = WWL(&o, &t); 1459 WARN_ON(ret); 1460 1461 ret = WWL(&o2, &t); 1462 WARN_ON(ret != -EDEADLK); 1463 1464 ret = WWL(&o3, &t); 1465 WARN_ON(ret != -EDEADLK); 1466 } 1467 1468 static void ww_test_edeadlk_acquire_more_edeadlk_slow(void) 1469 { 1470 int ret; 1471 1472 mutex_lock(&o2.base); 1473 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1474 o2.ctx = &t2; 1475 1476 mutex_lock(&o3.base); 1477 mutex_release(&o3.base.dep_map, 1, _THIS_IP_); 1478 o3.ctx = &t2; 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 ww_mutex_lock_slow(&o3, &t); 1491 } 1492 1493 static void ww_test_edeadlk_acquire_wrong(void) 1494 { 1495 int ret; 1496 1497 mutex_lock(&o2.base); 1498 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1499 o2.ctx = &t2; 1500 1501 WWAI(&t); 1502 t2 = t; 1503 t2.stamp--; 1504 1505 ret = WWL(&o, &t); 1506 WARN_ON(ret); 1507 1508 ret = WWL(&o2, &t); 1509 WARN_ON(ret != -EDEADLK); 1510 if (!ret) 1511 WWU(&o2); 1512 1513 WWU(&o); 1514 1515 ret = WWL(&o3, &t); 1516 } 1517 1518 static void ww_test_edeadlk_acquire_wrong_slow(void) 1519 { 1520 int ret; 1521 1522 mutex_lock(&o2.base); 1523 mutex_release(&o2.base.dep_map, 1, _THIS_IP_); 1524 o2.ctx = &t2; 1525 1526 WWAI(&t); 1527 t2 = t; 1528 t2.stamp--; 1529 1530 ret = WWL(&o, &t); 1531 WARN_ON(ret); 1532 1533 ret = WWL(&o2, &t); 1534 WARN_ON(ret != -EDEADLK); 1535 if (!ret) 1536 WWU(&o2); 1537 1538 WWU(&o); 1539 1540 ww_mutex_lock_slow(&o3, &t); 1541 } 1542 1543 static void ww_test_spin_nest_unlocked(void) 1544 { 1545 raw_spin_lock_nest_lock(&lock_A, &o.base); 1546 U(A); 1547 } 1548 1549 static void ww_test_unneeded_slow(void) 1550 { 1551 WWAI(&t); 1552 1553 ww_mutex_lock_slow(&o, &t); 1554 } 1555 1556 static void ww_test_context_block(void) 1557 { 1558 int ret; 1559 1560 WWAI(&t); 1561 1562 ret = WWL(&o, &t); 1563 WARN_ON(ret); 1564 WWL1(&o2); 1565 } 1566 1567 static void ww_test_context_try(void) 1568 { 1569 int ret; 1570 1571 WWAI(&t); 1572 1573 ret = WWL(&o, &t); 1574 WARN_ON(ret); 1575 1576 ret = WWT(&o2); 1577 WARN_ON(!ret); 1578 WWU(&o2); 1579 WWU(&o); 1580 } 1581 1582 static void ww_test_context_context(void) 1583 { 1584 int ret; 1585 1586 WWAI(&t); 1587 1588 ret = WWL(&o, &t); 1589 WARN_ON(ret); 1590 1591 ret = WWL(&o2, &t); 1592 WARN_ON(ret); 1593 1594 WWU(&o2); 1595 WWU(&o); 1596 } 1597 1598 static void ww_test_try_block(void) 1599 { 1600 bool ret; 1601 1602 ret = WWT(&o); 1603 WARN_ON(!ret); 1604 1605 WWL1(&o2); 1606 WWU(&o2); 1607 WWU(&o); 1608 } 1609 1610 static void ww_test_try_try(void) 1611 { 1612 bool ret; 1613 1614 ret = WWT(&o); 1615 WARN_ON(!ret); 1616 ret = WWT(&o2); 1617 WARN_ON(!ret); 1618 WWU(&o2); 1619 WWU(&o); 1620 } 1621 1622 static void ww_test_try_context(void) 1623 { 1624 int ret; 1625 1626 ret = WWT(&o); 1627 WARN_ON(!ret); 1628 1629 WWAI(&t); 1630 1631 ret = WWL(&o2, &t); 1632 WARN_ON(ret); 1633 } 1634 1635 static void ww_test_block_block(void) 1636 { 1637 WWL1(&o); 1638 WWL1(&o2); 1639 } 1640 1641 static void ww_test_block_try(void) 1642 { 1643 bool ret; 1644 1645 WWL1(&o); 1646 ret = WWT(&o2); 1647 WARN_ON(!ret); 1648 } 1649 1650 static void ww_test_block_context(void) 1651 { 1652 int ret; 1653 1654 WWL1(&o); 1655 WWAI(&t); 1656 1657 ret = WWL(&o2, &t); 1658 WARN_ON(ret); 1659 } 1660 1661 static void ww_test_spin_block(void) 1662 { 1663 L(A); 1664 U(A); 1665 1666 WWL1(&o); 1667 L(A); 1668 U(A); 1669 WWU(&o); 1670 1671 L(A); 1672 WWL1(&o); 1673 WWU(&o); 1674 U(A); 1675 } 1676 1677 static void ww_test_spin_try(void) 1678 { 1679 bool ret; 1680 1681 L(A); 1682 U(A); 1683 1684 ret = WWT(&o); 1685 WARN_ON(!ret); 1686 L(A); 1687 U(A); 1688 WWU(&o); 1689 1690 L(A); 1691 ret = WWT(&o); 1692 WARN_ON(!ret); 1693 WWU(&o); 1694 U(A); 1695 } 1696 1697 static void ww_test_spin_context(void) 1698 { 1699 int ret; 1700 1701 L(A); 1702 U(A); 1703 1704 WWAI(&t); 1705 1706 ret = WWL(&o, &t); 1707 WARN_ON(ret); 1708 L(A); 1709 U(A); 1710 WWU(&o); 1711 1712 L(A); 1713 ret = WWL(&o, &t); 1714 WARN_ON(ret); 1715 WWU(&o); 1716 U(A); 1717 } 1718 1719 static void ww_tests(void) 1720 { 1721 printk(" --------------------------------------------------------------------------\n"); 1722 printk(" | Wound/wait tests |\n"); 1723 printk(" ---------------------\n"); 1724 1725 print_testname("ww api failures"); 1726 dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW); 1727 dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW); 1728 dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW); 1729 printk("\n"); 1730 1731 print_testname("ww contexts mixing"); 1732 dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW); 1733 dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW); 1734 printk("\n"); 1735 1736 print_testname("finishing ww context"); 1737 dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW); 1738 dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW); 1739 dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW); 1740 dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW); 1741 printk("\n"); 1742 1743 print_testname("locking mismatches"); 1744 dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW); 1745 dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW); 1746 dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW); 1747 printk("\n"); 1748 1749 print_testname("EDEADLK handling"); 1750 dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW); 1751 dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW); 1752 dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW); 1753 dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW); 1754 dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW); 1755 dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW); 1756 dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW); 1757 dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW); 1758 dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW); 1759 dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW); 1760 printk("\n"); 1761 1762 print_testname("spinlock nest unlocked"); 1763 dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW); 1764 printk("\n"); 1765 1766 printk(" -----------------------------------------------------\n"); 1767 printk(" |block | try |context|\n"); 1768 printk(" -----------------------------------------------------\n"); 1769 1770 print_testname("context"); 1771 dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW); 1772 dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW); 1773 dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW); 1774 printk("\n"); 1775 1776 print_testname("try"); 1777 dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW); 1778 dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW); 1779 dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW); 1780 printk("\n"); 1781 1782 print_testname("block"); 1783 dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW); 1784 dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW); 1785 dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW); 1786 printk("\n"); 1787 1788 print_testname("spinlock"); 1789 dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW); 1790 dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW); 1791 dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW); 1792 printk("\n"); 1793 } 1794 1795 void locking_selftest(void) 1796 { 1797 /* 1798 * Got a locking failure before the selftest ran? 1799 */ 1800 if (!debug_locks) { 1801 printk("----------------------------------\n"); 1802 printk("| Locking API testsuite disabled |\n"); 1803 printk("----------------------------------\n"); 1804 return; 1805 } 1806 1807 /* 1808 * Run the testsuite: 1809 */ 1810 printk("------------------------\n"); 1811 printk("| Locking API testsuite:\n"); 1812 printk("----------------------------------------------------------------------------\n"); 1813 printk(" | spin |wlock |rlock |mutex | wsem | rsem |\n"); 1814 printk(" --------------------------------------------------------------------------\n"); 1815 1816 init_shared_classes(); 1817 debug_locks_silent = !debug_locks_verbose; 1818 1819 DO_TESTCASE_6R("A-A deadlock", AA); 1820 DO_TESTCASE_6R("A-B-B-A deadlock", ABBA); 1821 DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA); 1822 DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC); 1823 DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA); 1824 DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA); 1825 DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA); 1826 DO_TESTCASE_6("double unlock", double_unlock); 1827 DO_TESTCASE_6("initialize held", init_held); 1828 DO_TESTCASE_6_SUCCESS("bad unlock order", bad_unlock_order); 1829 1830 printk(" --------------------------------------------------------------------------\n"); 1831 print_testname("recursive read-lock"); 1832 printk(" |"); 1833 dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK); 1834 printk(" |"); 1835 dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM); 1836 printk("\n"); 1837 1838 print_testname("recursive read-lock #2"); 1839 printk(" |"); 1840 dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK); 1841 printk(" |"); 1842 dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM); 1843 printk("\n"); 1844 1845 print_testname("mixed read-write-lock"); 1846 printk(" |"); 1847 dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK); 1848 printk(" |"); 1849 dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM); 1850 printk("\n"); 1851 1852 print_testname("mixed write-read-lock"); 1853 printk(" |"); 1854 dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK); 1855 printk(" |"); 1856 dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM); 1857 printk("\n"); 1858 1859 printk(" --------------------------------------------------------------------------\n"); 1860 1861 /* 1862 * irq-context testcases: 1863 */ 1864 DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1); 1865 DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A); 1866 DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B); 1867 DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3); 1868 DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4); 1869 DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion); 1870 1871 DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion); 1872 // DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2); 1873 1874 ww_tests(); 1875 1876 if (unexpected_testcase_failures) { 1877 printk("-----------------------------------------------------------------\n"); 1878 debug_locks = 0; 1879 printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n", 1880 unexpected_testcase_failures, testcase_total); 1881 printk("-----------------------------------------------------------------\n"); 1882 } else if (expected_testcase_failures && testcase_successes) { 1883 printk("--------------------------------------------------------\n"); 1884 printk("%3d out of %3d testcases failed, as expected. |\n", 1885 expected_testcase_failures, testcase_total); 1886 printk("----------------------------------------------------\n"); 1887 debug_locks = 1; 1888 } else if (expected_testcase_failures && !testcase_successes) { 1889 printk("--------------------------------------------------------\n"); 1890 printk("All %3d testcases failed, as expected. |\n", 1891 expected_testcase_failures); 1892 printk("----------------------------------------\n"); 1893 debug_locks = 1; 1894 } else { 1895 printk("-------------------------------------------------------\n"); 1896 printk("Good, all %3d testcases passed! |\n", 1897 testcase_successes); 1898 printk("---------------------------------\n"); 1899 debug_locks = 1; 1900 } 1901 debug_locks_silent = 0; 1902 } 1903