// SPDX-License-Identifier: GPL-2.0 /* * lib/locking-selftest.c * * Testsuite for various locking APIs: spinlocks, rwlocks, * mutexes and rw-semaphores. * * It is checking both false positives and false negatives. * * Started by Ingo Molnar: * * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_PREEMPT_RT # define NON_RT(...) #else # define NON_RT(...) __VA_ARGS__ #endif /* * Change this to 1 if you want to see the failure printouts: */ static unsigned int debug_locks_verbose; unsigned int force_read_lock_recursive; static DEFINE_WD_CLASS(ww_lockdep); static int __init setup_debug_locks_verbose(char *str) { get_option(&str, &debug_locks_verbose); return 1; } __setup("debug_locks_verbose=", setup_debug_locks_verbose); #define FAILURE 0 #define SUCCESS 1 #define LOCKTYPE_SPIN 0x1 #define LOCKTYPE_RWLOCK 0x2 #define LOCKTYPE_MUTEX 0x4 #define LOCKTYPE_RWSEM 0x8 #define LOCKTYPE_WW 0x10 #define LOCKTYPE_RTMUTEX 0x20 #define LOCKTYPE_LL 0x40 #define LOCKTYPE_SPECIAL 0x80 static struct ww_acquire_ctx t, t2; static struct ww_mutex o, o2, o3; /* * Normal standalone locks, for the circular and irq-context * dependency tests: */ static DEFINE_SPINLOCK(lock_A); static DEFINE_SPINLOCK(lock_B); static DEFINE_SPINLOCK(lock_C); static DEFINE_SPINLOCK(lock_D); static DEFINE_RAW_SPINLOCK(raw_lock_A); static DEFINE_RAW_SPINLOCK(raw_lock_B); static DEFINE_RWLOCK(rwlock_A); static DEFINE_RWLOCK(rwlock_B); static DEFINE_RWLOCK(rwlock_C); static DEFINE_RWLOCK(rwlock_D); static DEFINE_MUTEX(mutex_A); static DEFINE_MUTEX(mutex_B); static DEFINE_MUTEX(mutex_C); static DEFINE_MUTEX(mutex_D); static DECLARE_RWSEM(rwsem_A); static DECLARE_RWSEM(rwsem_B); static DECLARE_RWSEM(rwsem_C); static DECLARE_RWSEM(rwsem_D); #ifdef CONFIG_RT_MUTEXES static DEFINE_RT_MUTEX(rtmutex_A); static DEFINE_RT_MUTEX(rtmutex_B); static DEFINE_RT_MUTEX(rtmutex_C); static DEFINE_RT_MUTEX(rtmutex_D); #endif /* * Locks that we initialize dynamically as well so that * e.g. X1 and X2 becomes two instances of the same class, * but X* and Y* are different classes. We do this so that * we do not trigger a real lockup: */ static DEFINE_SPINLOCK(lock_X1); static DEFINE_SPINLOCK(lock_X2); static DEFINE_SPINLOCK(lock_Y1); static DEFINE_SPINLOCK(lock_Y2); static DEFINE_SPINLOCK(lock_Z1); static DEFINE_SPINLOCK(lock_Z2); static DEFINE_RWLOCK(rwlock_X1); static DEFINE_RWLOCK(rwlock_X2); static DEFINE_RWLOCK(rwlock_Y1); static DEFINE_RWLOCK(rwlock_Y2); static DEFINE_RWLOCK(rwlock_Z1); static DEFINE_RWLOCK(rwlock_Z2); static DEFINE_MUTEX(mutex_X1); static DEFINE_MUTEX(mutex_X2); static DEFINE_MUTEX(mutex_Y1); static DEFINE_MUTEX(mutex_Y2); static DEFINE_MUTEX(mutex_Z1); static DEFINE_MUTEX(mutex_Z2); static DECLARE_RWSEM(rwsem_X1); static DECLARE_RWSEM(rwsem_X2); static DECLARE_RWSEM(rwsem_Y1); static DECLARE_RWSEM(rwsem_Y2); static DECLARE_RWSEM(rwsem_Z1); static DECLARE_RWSEM(rwsem_Z2); #ifdef CONFIG_RT_MUTEXES static DEFINE_RT_MUTEX(rtmutex_X1); static DEFINE_RT_MUTEX(rtmutex_X2); static DEFINE_RT_MUTEX(rtmutex_Y1); static DEFINE_RT_MUTEX(rtmutex_Y2); static DEFINE_RT_MUTEX(rtmutex_Z1); static DEFINE_RT_MUTEX(rtmutex_Z2); #endif static DEFINE_PER_CPU(local_lock_t, local_A); /* * non-inlined runtime initializers, to let separate locks share * the same lock-class: */ #define INIT_CLASS_FUNC(class) \ static noinline void \ init_class_##class(spinlock_t *lock, rwlock_t *rwlock, \ struct mutex *mutex, struct rw_semaphore *rwsem)\ { \ spin_lock_init(lock); \ rwlock_init(rwlock); \ mutex_init(mutex); \ init_rwsem(rwsem); \ } INIT_CLASS_FUNC(X) INIT_CLASS_FUNC(Y) INIT_CLASS_FUNC(Z) static void init_shared_classes(void) { #ifdef CONFIG_RT_MUTEXES static struct lock_class_key rt_X, rt_Y, rt_Z; __rt_mutex_init(&rtmutex_X1, __func__, &rt_X); __rt_mutex_init(&rtmutex_X2, __func__, &rt_X); __rt_mutex_init(&rtmutex_Y1, __func__, &rt_Y); __rt_mutex_init(&rtmutex_Y2, __func__, &rt_Y); __rt_mutex_init(&rtmutex_Z1, __func__, &rt_Z); __rt_mutex_init(&rtmutex_Z2, __func__, &rt_Z); #endif init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1); init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2); init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1); init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2); init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1); init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2); } /* * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests. * The following functions use a lock from a simulated hardirq/softirq * context, causing the locks to be marked as hardirq-safe/softirq-safe: */ #define HARDIRQ_DISABLE local_irq_disable #define HARDIRQ_ENABLE local_irq_enable #define HARDIRQ_ENTER() \ local_irq_disable(); \ __irq_enter(); \ lockdep_hardirq_threaded(); \ WARN_ON(!in_irq()); #define HARDIRQ_EXIT() \ __irq_exit(); \ local_irq_enable(); #define SOFTIRQ_DISABLE local_bh_disable #define SOFTIRQ_ENABLE local_bh_enable #define SOFTIRQ_ENTER() \ local_bh_disable(); \ local_irq_disable(); \ lockdep_softirq_enter(); \ WARN_ON(!in_softirq()); #define SOFTIRQ_EXIT() \ lockdep_softirq_exit(); \ local_irq_enable(); \ local_bh_enable(); /* * Shortcuts for lock/unlock API variants, to keep * the testcases compact: */ #define L(x) spin_lock(&lock_##x) #define U(x) spin_unlock(&lock_##x) #define LU(x) L(x); U(x) #define SI(x) spin_lock_init(&lock_##x) #define WL(x) write_lock(&rwlock_##x) #define WU(x) write_unlock(&rwlock_##x) #define WLU(x) WL(x); WU(x) #define RL(x) read_lock(&rwlock_##x) #define RU(x) read_unlock(&rwlock_##x) #define RLU(x) RL(x); RU(x) #define RWI(x) rwlock_init(&rwlock_##x) #define ML(x) mutex_lock(&mutex_##x) #define MU(x) mutex_unlock(&mutex_##x) #define MI(x) mutex_init(&mutex_##x) #define RTL(x) rt_mutex_lock(&rtmutex_##x) #define RTU(x) rt_mutex_unlock(&rtmutex_##x) #define RTI(x) rt_mutex_init(&rtmutex_##x) #define WSL(x) down_write(&rwsem_##x) #define WSU(x) up_write(&rwsem_##x) #define RSL(x) down_read(&rwsem_##x) #define RSU(x) up_read(&rwsem_##x) #define RWSI(x) init_rwsem(&rwsem_##x) #ifndef CONFIG_DEBUG_WW_MUTEX_SLOWPATH #define WWAI(x) ww_acquire_init(x, &ww_lockdep) #else #define WWAI(x) do { ww_acquire_init(x, &ww_lockdep); (x)->deadlock_inject_countdown = ~0U; } while (0) #endif #define WWAD(x) ww_acquire_done(x) #define WWAF(x) ww_acquire_fini(x) #define WWL(x, c) ww_mutex_lock(x, c) #define WWT(x) ww_mutex_trylock(x, NULL) #define WWL1(x) ww_mutex_lock(x, NULL) #define WWU(x) ww_mutex_unlock(x) #define LOCK_UNLOCK_2(x,y) LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x) /* * Generate different permutations of the same testcase, using * the same basic lock-dependency/state events: */ #define GENERATE_TESTCASE(name) \ \ static void name(void) { E(); } #define GENERATE_PERMUTATIONS_2_EVENTS(name) \ \ static void name##_12(void) { E1(); E2(); } \ static void name##_21(void) { E2(); E1(); } #define GENERATE_PERMUTATIONS_3_EVENTS(name) \ \ static void name##_123(void) { E1(); E2(); E3(); } \ static void name##_132(void) { E1(); E3(); E2(); } \ static void name##_213(void) { E2(); E1(); E3(); } \ static void name##_231(void) { E2(); E3(); E1(); } \ static void name##_312(void) { E3(); E1(); E2(); } \ static void name##_321(void) { E3(); E2(); E1(); } /* * AA deadlock: */ #define E() \ \ LOCK(X1); \ LOCK(X2); /* this one should fail */ /* * 6 testcases: */ #include "locking-selftest-spin.h" GENERATE_TESTCASE(AA_spin) #include "locking-selftest-wlock.h" GENERATE_TESTCASE(AA_wlock) #include "locking-selftest-rlock.h" GENERATE_TESTCASE(AA_rlock) #include "locking-selftest-mutex.h" GENERATE_TESTCASE(AA_mutex) #include "locking-selftest-wsem.h" GENERATE_TESTCASE(AA_wsem) #include "locking-selftest-rsem.h" GENERATE_TESTCASE(AA_rsem) #ifdef CONFIG_RT_MUTEXES #include "locking-selftest-rtmutex.h" GENERATE_TESTCASE(AA_rtmutex); #endif #undef E /* * Special-case for read-locking, they are * allowed to recurse on the same lock class: */ static void rlock_AA1(void) { RL(X1); RL(X1); // this one should NOT fail } static void rlock_AA1B(void) { RL(X1); RL(X2); // this one should NOT fail } static void rsem_AA1(void) { RSL(X1); RSL(X1); // this one should fail } static void rsem_AA1B(void) { RSL(X1); RSL(X2); // this one should fail } /* * The mixing of read and write locks is not allowed: */ static void rlock_AA2(void) { RL(X1); WL(X2); // this one should fail } static void rsem_AA2(void) { RSL(X1); WSL(X2); // this one should fail } static void rlock_AA3(void) { WL(X1); RL(X2); // this one should fail } static void rsem_AA3(void) { WSL(X1); RSL(X2); // this one should fail } /* * read_lock(A) * spin_lock(B) * spin_lock(B) * write_lock(A) */ static void rlock_ABBA1(void) { RL(X1); L(Y1); U(Y1); RU(X1); L(Y1); WL(X1); WU(X1); U(Y1); // should fail } static void rwsem_ABBA1(void) { RSL(X1); ML(Y1); MU(Y1); RSU(X1); ML(Y1); WSL(X1); WSU(X1); MU(Y1); // should fail } /* * read_lock(A) * spin_lock(B) * spin_lock(B) * write_lock(A) * * This test case is aimed at poking whether the chain cache prevents us from * detecting a read-lock/lock-write deadlock: if the chain cache doesn't differ * read/write locks, the following case may happen * * { read_lock(A)->lock(B) dependency exists } * * P0: * lock(B); * read_lock(A); * * { Not a deadlock, B -> A is added in the chain cache } * * P1: * lock(B); * write_lock(A); * * { B->A found in chain cache, not reported as a deadlock } * */ static void rlock_chaincache_ABBA1(void) { RL(X1); L(Y1); U(Y1); RU(X1); L(Y1); RL(X1); RU(X1); U(Y1); L(Y1); WL(X1); WU(X1); U(Y1); // should fail } /* * read_lock(A) * spin_lock(B) * spin_lock(B) * read_lock(A) */ static void rlock_ABBA2(void) { RL(X1); L(Y1); U(Y1); RU(X1); L(Y1); RL(X1); RU(X1); U(Y1); // should NOT fail } static void rwsem_ABBA2(void) { RSL(X1); ML(Y1); MU(Y1); RSU(X1); ML(Y1); RSL(X1); RSU(X1); MU(Y1); // should fail } /* * write_lock(A) * spin_lock(B) * spin_lock(B) * write_lock(A) */ static void rlock_ABBA3(void) { WL(X1); L(Y1); U(Y1); WU(X1); L(Y1); WL(X1); WU(X1); U(Y1); // should fail } static void rwsem_ABBA3(void) { WSL(X1); ML(Y1); MU(Y1); WSU(X1); ML(Y1); WSL(X1); WSU(X1); MU(Y1); // should fail } /* * ABBA deadlock: */ #define E() \ \ LOCK_UNLOCK_2(A, B); \ LOCK_UNLOCK_2(B, A); /* fail */ /* * 6 testcases: */ #include "locking-selftest-spin.h" GENERATE_TESTCASE(ABBA_spin) #include "locking-selftest-wlock.h" GENERATE_TESTCASE(ABBA_wlock) #include "locking-selftest-rlock.h" GENERATE_TESTCASE(ABBA_rlock) #include "locking-selftest-mutex.h" GENERATE_TESTCASE(ABBA_mutex) #include "locking-selftest-wsem.h" GENERATE_TESTCASE(ABBA_wsem) #include "locking-selftest-rsem.h" GENERATE_TESTCASE(ABBA_rsem) #ifdef CONFIG_RT_MUTEXES #include "locking-selftest-rtmutex.h" GENERATE_TESTCASE(ABBA_rtmutex); #endif #undef E /* * AB BC CA deadlock: */ #define E() \ \ LOCK_UNLOCK_2(A, B); \ LOCK_UNLOCK_2(B, C); \ LOCK_UNLOCK_2(C, A); /* fail */ /* * 6 testcases: */ #include "locking-selftest-spin.h" GENERATE_TESTCASE(ABBCCA_spin) #include "locking-selftest-wlock.h" GENERATE_TESTCASE(ABBCCA_wlock) #include "locking-selftest-rlock.h" GENERATE_TESTCASE(ABBCCA_rlock) #include "locking-selftest-mutex.h" GENERATE_TESTCASE(ABBCCA_mutex) #include "locking-selftest-wsem.h" GENERATE_TESTCASE(ABBCCA_wsem) #include "locking-selftest-rsem.h" GENERATE_TESTCASE(ABBCCA_rsem) #ifdef CONFIG_RT_MUTEXES #include "locking-selftest-rtmutex.h" GENERATE_TESTCASE(ABBCCA_rtmutex); #endif #undef E /* * AB CA BC deadlock: */ #define E() \ \ LOCK_UNLOCK_2(A, B); \ LOCK_UNLOCK_2(C, A); \ LOCK_UNLOCK_2(B, C); /* fail */ /* * 6 testcases: */ #include "locking-selftest-spin.h" GENERATE_TESTCASE(ABCABC_spin) #include "locking-selftest-wlock.h" GENERATE_TESTCASE(ABCABC_wlock) #include "locking-selftest-rlock.h" GENERATE_TESTCASE(ABCABC_rlock) #include "locking-selftest-mutex.h" GENERATE_TESTCASE(ABCABC_mutex) #include "locking-selftest-wsem.h" GENERATE_TESTCASE(ABCABC_wsem) #include "locking-selftest-rsem.h" GENERATE_TESTCASE(ABCABC_rsem) #ifdef CONFIG_RT_MUTEXES #include "locking-selftest-rtmutex.h" GENERATE_TESTCASE(ABCABC_rtmutex); #endif #undef E /* * AB BC CD DA deadlock: */ #define E() \ \ LOCK_UNLOCK_2(A, B); \ LOCK_UNLOCK_2(B, C); \ LOCK_UNLOCK_2(C, D); \ LOCK_UNLOCK_2(D, A); /* fail */ /* * 6 testcases: */ #include "locking-selftest-spin.h" GENERATE_TESTCASE(ABBCCDDA_spin) #include "locking-selftest-wlock.h" GENERATE_TESTCASE(ABBCCDDA_wlock) #include "locking-selftest-rlock.h" GENERATE_TESTCASE(ABBCCDDA_rlock) #include "locking-selftest-mutex.h" GENERATE_TESTCASE(ABBCCDDA_mutex) #include "locking-selftest-wsem.h" GENERATE_TESTCASE(ABBCCDDA_wsem) #include "locking-selftest-rsem.h" GENERATE_TESTCASE(ABBCCDDA_rsem) #ifdef CONFIG_RT_MUTEXES #include "locking-selftest-rtmutex.h" GENERATE_TESTCASE(ABBCCDDA_rtmutex); #endif #undef E /* * AB CD BD DA deadlock: */ #define E() \ \ LOCK_UNLOCK_2(A, B); \ LOCK_UNLOCK_2(C, D); \ LOCK_UNLOCK_2(B, D); \ LOCK_UNLOCK_2(D, A); /* fail */ /* * 6 testcases: */ #include "locking-selftest-spin.h" GENERATE_TESTCASE(ABCDBDDA_spin) #include "locking-selftest-wlock.h" GENERATE_TESTCASE(ABCDBDDA_wlock) #include "locking-selftest-rlock.h" GENERATE_TESTCASE(ABCDBDDA_rlock) #include "locking-selftest-mutex.h" GENERATE_TESTCASE(ABCDBDDA_mutex) #include "locking-selftest-wsem.h" GENERATE_TESTCASE(ABCDBDDA_wsem) #include "locking-selftest-rsem.h" GENERATE_TESTCASE(ABCDBDDA_rsem) #ifdef CONFIG_RT_MUTEXES #include "locking-selftest-rtmutex.h" GENERATE_TESTCASE(ABCDBDDA_rtmutex); #endif #undef E /* * AB CD BC DA deadlock: */ #define E() \ \ LOCK_UNLOCK_2(A, B); \ LOCK_UNLOCK_2(C, D); \ LOCK_UNLOCK_2(B, C); \ LOCK_UNLOCK_2(D, A); /* fail */ /* * 6 testcases: */ #include "locking-selftest-spin.h" GENERATE_TESTCASE(ABCDBCDA_spin) #include "locking-selftest-wlock.h" GENERATE_TESTCASE(ABCDBCDA_wlock) #include "locking-selftest-rlock.h" GENERATE_TESTCASE(ABCDBCDA_rlock) #include "locking-selftest-mutex.h" GENERATE_TESTCASE(ABCDBCDA_mutex) #include "locking-selftest-wsem.h" GENERATE_TESTCASE(ABCDBCDA_wsem) #include "locking-selftest-rsem.h" GENERATE_TESTCASE(ABCDBCDA_rsem) #ifdef CONFIG_RT_MUTEXES #include "locking-selftest-rtmutex.h" GENERATE_TESTCASE(ABCDBCDA_rtmutex); #endif #undef E #ifdef CONFIG_PREEMPT_RT # define RT_PREPARE_DBL_UNLOCK() { migrate_disable(); rcu_read_lock(); } #else # define RT_PREPARE_DBL_UNLOCK() #endif /* * Double unlock: */ #define E() \ \ LOCK(A); \ RT_PREPARE_DBL_UNLOCK(); \ UNLOCK(A); \ UNLOCK(A); /* fail */ /* * 6 testcases: */ #include "locking-selftest-spin.h" GENERATE_TESTCASE(double_unlock_spin) #include "locking-selftest-wlock.h" GENERATE_TESTCASE(double_unlock_wlock) #include "locking-selftest-rlock.h" GENERATE_TESTCASE(double_unlock_rlock) #include "locking-selftest-mutex.h" GENERATE_TESTCASE(double_unlock_mutex) #include "locking-selftest-wsem.h" GENERATE_TESTCASE(double_unlock_wsem) #include "locking-selftest-rsem.h" GENERATE_TESTCASE(double_unlock_rsem) #ifdef CONFIG_RT_MUTEXES #include "locking-selftest-rtmutex.h" GENERATE_TESTCASE(double_unlock_rtmutex); #endif #undef E /* * initializing a held lock: */ #define E() \ \ LOCK(A); \ INIT(A); /* fail */ /* * 6 testcases: */ #include "locking-selftest-spin.h" GENERATE_TESTCASE(init_held_spin) #include "locking-selftest-wlock.h" GENERATE_TESTCASE(init_held_wlock) #include "locking-selftest-rlock.h" GENERATE_TESTCASE(init_held_rlock) #include "locking-selftest-mutex.h" GENERATE_TESTCASE(init_held_mutex) #include "locking-selftest-wsem.h" GENERATE_TESTCASE(init_held_wsem) #include "locking-selftest-rsem.h" GENERATE_TESTCASE(init_held_rsem) #ifdef CONFIG_RT_MUTEXES #include "locking-selftest-rtmutex.h" GENERATE_TESTCASE(init_held_rtmutex); #endif #undef E /* * locking an irq-safe lock with irqs enabled: */ #define E1() \ \ IRQ_ENTER(); \ LOCK(A); \ UNLOCK(A); \ IRQ_EXIT(); #define E2() \ \ LOCK(A); \ UNLOCK(A); /* * Generate 24 testcases: */ #include "locking-selftest-spin-hardirq.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin) #include "locking-selftest-rlock-hardirq.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock) #include "locking-selftest-wlock-hardirq.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock) #ifndef CONFIG_PREEMPT_RT #include "locking-selftest-spin-softirq.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin) #include "locking-selftest-rlock-softirq.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock) #include "locking-selftest-wlock-softirq.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock) #endif #undef E1 #undef E2 #ifndef CONFIG_PREEMPT_RT /* * Enabling hardirqs with a softirq-safe lock held: */ #define E1() \ \ SOFTIRQ_ENTER(); \ LOCK(A); \ UNLOCK(A); \ SOFTIRQ_EXIT(); #define E2() \ \ HARDIRQ_DISABLE(); \ LOCK(A); \ HARDIRQ_ENABLE(); \ UNLOCK(A); /* * Generate 12 testcases: */ #include "locking-selftest-spin.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin) #include "locking-selftest-wlock.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock) #include "locking-selftest-rlock.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock) #undef E1 #undef E2 #endif /* * Enabling irqs with an irq-safe lock held: */ #define E1() \ \ IRQ_ENTER(); \ LOCK(A); \ UNLOCK(A); \ IRQ_EXIT(); #define E2() \ \ IRQ_DISABLE(); \ LOCK(A); \ IRQ_ENABLE(); \ UNLOCK(A); /* * Generate 24 testcases: */ #include "locking-selftest-spin-hardirq.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin) #include "locking-selftest-rlock-hardirq.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock) #include "locking-selftest-wlock-hardirq.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock) #ifndef CONFIG_PREEMPT_RT #include "locking-selftest-spin-softirq.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin) #include "locking-selftest-rlock-softirq.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock) #include "locking-selftest-wlock-softirq.h" GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock) #endif #undef E1 #undef E2 /* * Acquiring a irq-unsafe lock while holding an irq-safe-lock: */ #define E1() \ \ LOCK(A); \ LOCK(B); \ UNLOCK(B); \ UNLOCK(A); \ #define E2() \ \ LOCK(B); \ UNLOCK(B); #define E3() \ \ IRQ_ENTER(); \ LOCK(A); \ UNLOCK(A); \ IRQ_EXIT(); /* * Generate 36 testcases: */ #include "locking-selftest-spin-hardirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin) #include "locking-selftest-rlock-hardirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock) #include "locking-selftest-wlock-hardirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock) #ifndef CONFIG_PREEMPT_RT #include "locking-selftest-spin-softirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin) #include "locking-selftest-rlock-softirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock) #include "locking-selftest-wlock-softirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock) #endif #undef E1 #undef E2 #undef E3 /* * If a lock turns into softirq-safe, but earlier it took * a softirq-unsafe lock: */ #define E1() \ IRQ_DISABLE(); \ LOCK(A); \ LOCK(B); \ UNLOCK(B); \ UNLOCK(A); \ IRQ_ENABLE(); #define E2() \ LOCK(B); \ UNLOCK(B); #define E3() \ IRQ_ENTER(); \ LOCK(A); \ UNLOCK(A); \ IRQ_EXIT(); /* * Generate 36 testcases: */ #include "locking-selftest-spin-hardirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin) #include "locking-selftest-rlock-hardirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock) #include "locking-selftest-wlock-hardirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock) #ifndef CONFIG_PREEMPT_RT #include "locking-selftest-spin-softirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin) #include "locking-selftest-rlock-softirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock) #include "locking-selftest-wlock-softirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock) #endif #undef E1 #undef E2 #undef E3 /* * read-lock / write-lock irq inversion. * * Deadlock scenario: * * CPU#1 is at #1, i.e. it has write-locked A, but has not * taken B yet. * * CPU#2 is at #2, i.e. it has locked B. * * Hardirq hits CPU#2 at point #2 and is trying to read-lock A. * * The deadlock occurs because CPU#1 will spin on B, and CPU#2 * will spin on A. */ #define E1() \ \ IRQ_DISABLE(); \ WL(A); \ LOCK(B); \ UNLOCK(B); \ WU(A); \ IRQ_ENABLE(); #define E2() \ \ LOCK(B); \ UNLOCK(B); #define E3() \ \ IRQ_ENTER(); \ RL(A); \ RU(A); \ IRQ_EXIT(); /* * Generate 36 testcases: */ #include "locking-selftest-spin-hardirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin) #include "locking-selftest-rlock-hardirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock) #include "locking-selftest-wlock-hardirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock) #ifndef CONFIG_PREEMPT_RT #include "locking-selftest-spin-softirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin) #include "locking-selftest-rlock-softirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock) #include "locking-selftest-wlock-softirq.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock) #endif #undef E1 #undef E2 #undef E3 /* * write-read / write-read / write-read deadlock even if read is recursive */ #define E1() \ \ WL(X1); \ RL(Y1); \ RU(Y1); \ WU(X1); #define E2() \ \ WL(Y1); \ RL(Z1); \ RU(Z1); \ WU(Y1); #define E3() \ \ WL(Z1); \ RL(X1); \ RU(X1); \ WU(Z1); #include "locking-selftest-rlock.h" GENERATE_PERMUTATIONS_3_EVENTS(W1R2_W2R3_W3R1) #undef E1 #undef E2 #undef E3 /* * write-write / read-read / write-read deadlock even if read is recursive */ #define E1() \ \ WL(X1); \ WL(Y1); \ WU(Y1); \ WU(X1); #define E2() \ \ RL(Y1); \ RL(Z1); \ RU(Z1); \ RU(Y1); #define E3() \ \ WL(Z1); \ RL(X1); \ RU(X1); \ WU(Z1); #include "locking-selftest-rlock.h" GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_W3R1) #undef E1 #undef E2 #undef E3 /* * write-write / read-read / read-write is not deadlock when read is recursive */ #define E1() \ \ WL(X1); \ WL(Y1); \ WU(Y1); \ WU(X1); #define E2() \ \ RL(Y1); \ RL(Z1); \ RU(Z1); \ RU(Y1); #define E3() \ \ RL(Z1); \ WL(X1); \ WU(X1); \ RU(Z1); #include "locking-selftest-rlock.h" GENERATE_PERMUTATIONS_3_EVENTS(W1R2_R2R3_W3W1) #undef E1 #undef E2 #undef E3 /* * write-read / read-read / write-write is not deadlock when read is recursive */ #define E1() \ \ WL(X1); \ RL(Y1); \ RU(Y1); \ WU(X1); #define E2() \ \ RL(Y1); \ RL(Z1); \ RU(Z1); \ RU(Y1); #define E3() \ \ WL(Z1); \ WL(X1); \ WU(X1); \ WU(Z1); #include "locking-selftest-rlock.h" GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_R3W1) #undef E1 #undef E2 #undef E3 /* * read-lock / write-lock recursion that is actually safe. */ #define E1() \ \ IRQ_DISABLE(); \ WL(A); \ WU(A); \ IRQ_ENABLE(); #define E2() \ \ RL(A); \ RU(A); \ #define E3() \ \ IRQ_ENTER(); \ LOCK(A); \ L(B); \ U(B); \ UNLOCK(A); \ IRQ_EXIT(); /* * Generate 24 testcases: */ #include "locking-selftest-hardirq.h" #include "locking-selftest-rlock.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_rlock) #include "locking-selftest-wlock.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_wlock) #ifndef CONFIG_PREEMPT_RT #include "locking-selftest-softirq.h" #include "locking-selftest-rlock.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_rlock) #include "locking-selftest-wlock.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_wlock) #endif #undef E1 #undef E2 #undef E3 /* * read-lock / write-lock recursion that is unsafe. */ #define E1() \ \ IRQ_DISABLE(); \ L(B); \ LOCK(A); \ UNLOCK(A); \ U(B); \ IRQ_ENABLE(); #define E2() \ \ RL(A); \ RU(A); \ #define E3() \ \ IRQ_ENTER(); \ L(B); \ U(B); \ IRQ_EXIT(); /* * Generate 24 testcases: */ #include "locking-selftest-hardirq.h" #include "locking-selftest-rlock.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_rlock) #include "locking-selftest-wlock.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_wlock) #ifndef CONFIG_PREEMPT_RT #include "locking-selftest-softirq.h" #include "locking-selftest-rlock.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_rlock) #include "locking-selftest-wlock.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_wlock) #endif #undef E1 #undef E2 #undef E3 /* * read-lock / write-lock recursion that is unsafe. * * A is a ENABLED_*_READ lock * B is a USED_IN_*_READ lock * * read_lock(A); * write_lock(B); * * read_lock(B); * write_lock(A); // if this one is read_lock(), no deadlock */ #define E1() \ \ IRQ_DISABLE(); \ WL(B); \ LOCK(A); \ UNLOCK(A); \ WU(B); \ IRQ_ENABLE(); #define E2() \ \ RL(A); \ RU(A); \ #define E3() \ \ IRQ_ENTER(); \ RL(B); \ RU(B); \ IRQ_EXIT(); /* * Generate 24 testcases: */ #include "locking-selftest-hardirq.h" #include "locking-selftest-rlock.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_rlock) #include "locking-selftest-wlock.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_wlock) #ifndef CONFIG_PREEMPT_RT #include "locking-selftest-softirq.h" #include "locking-selftest-rlock.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_rlock) #include "locking-selftest-wlock.h" GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_wlock) #endif #ifdef CONFIG_DEBUG_LOCK_ALLOC # define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map) # define I_RAW_SPINLOCK(x) lockdep_reset_lock(&raw_lock_##x.dep_map) # define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map) # define I_MUTEX(x) lockdep_reset_lock(&mutex_##x.dep_map) # define I_RWSEM(x) lockdep_reset_lock(&rwsem_##x.dep_map) # define I_WW(x) lockdep_reset_lock(&x.dep_map) # define I_LOCAL_LOCK(x) lockdep_reset_lock(this_cpu_ptr(&local_##x.dep_map)) #ifdef CONFIG_RT_MUTEXES # define I_RTMUTEX(x) lockdep_reset_lock(&rtmutex_##x.dep_map) #endif #else # define I_SPINLOCK(x) # define I_RAW_SPINLOCK(x) # define I_RWLOCK(x) # define I_MUTEX(x) # define I_RWSEM(x) # define I_WW(x) # define I_LOCAL_LOCK(x) #endif #ifndef I_RTMUTEX # define I_RTMUTEX(x) #endif #ifdef CONFIG_RT_MUTEXES #define I2_RTMUTEX(x) rt_mutex_init(&rtmutex_##x) #else #define I2_RTMUTEX(x) #endif #define I1(x) \ do { \ I_SPINLOCK(x); \ I_RWLOCK(x); \ I_MUTEX(x); \ I_RWSEM(x); \ I_RTMUTEX(x); \ } while (0) #define I2(x) \ do { \ spin_lock_init(&lock_##x); \ rwlock_init(&rwlock_##x); \ mutex_init(&mutex_##x); \ init_rwsem(&rwsem_##x); \ I2_RTMUTEX(x); \ } while (0) static void reset_locks(void) { local_irq_disable(); lockdep_free_key_range(&ww_lockdep.acquire_key, 1); lockdep_free_key_range(&ww_lockdep.mutex_key, 1); I1(A); I1(B); I1(C); I1(D); I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2); I_WW(t); I_WW(t2); I_WW(o.base); I_WW(o2.base); I_WW(o3.base); I_RAW_SPINLOCK(A); I_RAW_SPINLOCK(B); I_LOCAL_LOCK(A); lockdep_reset(); I2(A); I2(B); I2(C); I2(D); init_shared_classes(); raw_spin_lock_init(&raw_lock_A); raw_spin_lock_init(&raw_lock_B); local_lock_init(this_cpu_ptr(&local_A)); ww_mutex_init(&o, &ww_lockdep); ww_mutex_init(&o2, &ww_lockdep); ww_mutex_init(&o3, &ww_lockdep); memset(&t, 0, sizeof(t)); memset(&t2, 0, sizeof(t2)); memset(&ww_lockdep.acquire_key, 0, sizeof(ww_lockdep.acquire_key)); memset(&ww_lockdep.mutex_key, 0, sizeof(ww_lockdep.mutex_key)); local_irq_enable(); } #undef I static int testcase_total; static int testcase_successes; static int expected_testcase_failures; static int unexpected_testcase_failures; static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask) { int saved_preempt_count = preempt_count(); #ifdef CONFIG_PREEMPT_RT #ifdef CONFIG_SMP int saved_mgd_count = current->migration_disabled; #endif int saved_rcu_count = current->rcu_read_lock_nesting; #endif WARN_ON(irqs_disabled()); debug_locks_silent = !(debug_locks_verbose & lockclass_mask); testcase_fn(); /* * Filter out expected failures: */ #ifndef CONFIG_PROVE_LOCKING if (expected == FAILURE && debug_locks) { expected_testcase_failures++; pr_cont("failed|"); } else #endif if (debug_locks != expected) { unexpected_testcase_failures++; pr_cont("FAILED|"); } else { testcase_successes++; pr_cont(" ok |"); } testcase_total++; if (debug_locks_verbose & lockclass_mask) pr_cont(" lockclass mask: %x, debug_locks: %d, expected: %d\n", lockclass_mask, debug_locks, expected); /* * Some tests (e.g. double-unlock) might corrupt the preemption * count, so restore it: */ preempt_count_set(saved_preempt_count); #ifdef CONFIG_PREEMPT_RT #ifdef CONFIG_SMP while (current->migration_disabled > saved_mgd_count) migrate_enable(); #endif while (current->rcu_read_lock_nesting > saved_rcu_count) rcu_read_unlock(); WARN_ON_ONCE(current->rcu_read_lock_nesting < saved_rcu_count); #endif #ifdef CONFIG_TRACE_IRQFLAGS if (softirq_count()) current->softirqs_enabled = 0; else current->softirqs_enabled = 1; #endif reset_locks(); } #ifdef CONFIG_RT_MUTEXES #define dotest_rt(fn, e, m) dotest((fn), (e), (m)) #else #define dotest_rt(fn, e, m) #endif static inline void print_testname(const char *testname) { printk("%33s:", testname); } #define DO_TESTCASE_1(desc, name, nr) \ print_testname(desc"/"#nr); \ dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ pr_cont("\n"); #define DO_TESTCASE_1B(desc, name, nr) \ print_testname(desc"/"#nr); \ dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \ pr_cont("\n"); #define DO_TESTCASE_1RR(desc, name, nr) \ print_testname(desc"/"#nr); \ pr_cont(" |"); \ dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ pr_cont("\n"); #define DO_TESTCASE_1RRB(desc, name, nr) \ print_testname(desc"/"#nr); \ pr_cont(" |"); \ dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \ pr_cont("\n"); #define DO_TESTCASE_3(desc, name, nr) \ print_testname(desc"/"#nr); \ dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \ dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ pr_cont("\n"); #define DO_TESTCASE_3RW(desc, name, nr) \ print_testname(desc"/"#nr); \ dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\ dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ pr_cont("\n"); #define DO_TESTCASE_2RW(desc, name, nr) \ print_testname(desc"/"#nr); \ pr_cont(" |"); \ dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ pr_cont("\n"); #define DO_TESTCASE_2x2RW(desc, name, nr) \ DO_TESTCASE_2RW("hard-"desc, name##_hard, nr) \ NON_RT(DO_TESTCASE_2RW("soft-"desc, name##_soft, nr)) \ #define DO_TESTCASE_6x2x2RW(desc, name) \ DO_TESTCASE_2x2RW(desc, name, 123); \ DO_TESTCASE_2x2RW(desc, name, 132); \ DO_TESTCASE_2x2RW(desc, name, 213); \ DO_TESTCASE_2x2RW(desc, name, 231); \ DO_TESTCASE_2x2RW(desc, name, 312); \ DO_TESTCASE_2x2RW(desc, name, 321); #define DO_TESTCASE_6(desc, name) \ print_testname(desc); \ dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \ pr_cont("\n"); #define DO_TESTCASE_6_SUCCESS(desc, name) \ print_testname(desc); \ dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN); \ dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK); \ dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX); \ dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM); \ dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM); \ dotest_rt(name##_rtmutex, SUCCESS, LOCKTYPE_RTMUTEX); \ pr_cont("\n"); /* * 'read' variant: rlocks must not trigger. */ #define DO_TESTCASE_6R(desc, name) \ print_testname(desc); \ dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \ pr_cont("\n"); #define DO_TESTCASE_2I(desc, name, nr) \ DO_TESTCASE_1("hard-"desc, name##_hard, nr); \ NON_RT(DO_TESTCASE_1("soft-"desc, name##_soft, nr)); #define DO_TESTCASE_2IB(desc, name, nr) \ DO_TESTCASE_1B("hard-"desc, name##_hard, nr); \ NON_RT(DO_TESTCASE_1B("soft-"desc, name##_soft, nr)); #define DO_TESTCASE_6I(desc, name, nr) \ DO_TESTCASE_3("hard-"desc, name##_hard, nr); \ NON_RT(DO_TESTCASE_3("soft-"desc, name##_soft, nr)); #define DO_TESTCASE_6IRW(desc, name, nr) \ DO_TESTCASE_3RW("hard-"desc, name##_hard, nr); \ NON_RT(DO_TESTCASE_3RW("soft-"desc, name##_soft, nr)); #define DO_TESTCASE_2x3(desc, name) \ DO_TESTCASE_3(desc, name, 12); \ DO_TESTCASE_3(desc, name, 21); #define DO_TESTCASE_2x6(desc, name) \ DO_TESTCASE_6I(desc, name, 12); \ DO_TESTCASE_6I(desc, name, 21); #define DO_TESTCASE_6x2(desc, name) \ DO_TESTCASE_2I(desc, name, 123); \ DO_TESTCASE_2I(desc, name, 132); \ DO_TESTCASE_2I(desc, name, 213); \ DO_TESTCASE_2I(desc, name, 231); \ DO_TESTCASE_2I(desc, name, 312); \ DO_TESTCASE_2I(desc, name, 321); #define DO_TESTCASE_6x2B(desc, name) \ DO_TESTCASE_2IB(desc, name, 123); \ DO_TESTCASE_2IB(desc, name, 132); \ DO_TESTCASE_2IB(desc, name, 213); \ DO_TESTCASE_2IB(desc, name, 231); \ DO_TESTCASE_2IB(desc, name, 312); \ DO_TESTCASE_2IB(desc, name, 321); #define DO_TESTCASE_6x1RR(desc, name) \ DO_TESTCASE_1RR(desc, name, 123); \ DO_TESTCASE_1RR(desc, name, 132); \ DO_TESTCASE_1RR(desc, name, 213); \ DO_TESTCASE_1RR(desc, name, 231); \ DO_TESTCASE_1RR(desc, name, 312); \ DO_TESTCASE_1RR(desc, name, 321); #define DO_TESTCASE_6x1RRB(desc, name) \ DO_TESTCASE_1RRB(desc, name, 123); \ DO_TESTCASE_1RRB(desc, name, 132); \ DO_TESTCASE_1RRB(desc, name, 213); \ DO_TESTCASE_1RRB(desc, name, 231); \ DO_TESTCASE_1RRB(desc, name, 312); \ DO_TESTCASE_1RRB(desc, name, 321); #define DO_TESTCASE_6x6(desc, name) \ DO_TESTCASE_6I(desc, name, 123); \ DO_TESTCASE_6I(desc, name, 132); \ DO_TESTCASE_6I(desc, name, 213); \ DO_TESTCASE_6I(desc, name, 231); \ DO_TESTCASE_6I(desc, name, 312); \ DO_TESTCASE_6I(desc, name, 321); #define DO_TESTCASE_6x6RW(desc, name) \ DO_TESTCASE_6IRW(desc, name, 123); \ DO_TESTCASE_6IRW(desc, name, 132); \ DO_TESTCASE_6IRW(desc, name, 213); \ DO_TESTCASE_6IRW(desc, name, 231); \ DO_TESTCASE_6IRW(desc, name, 312); \ DO_TESTCASE_6IRW(desc, name, 321); static void ww_test_fail_acquire(void) { int ret; WWAI(&t); t.stamp++; ret = WWL(&o, &t); if (WARN_ON(!o.ctx) || WARN_ON(ret)) return; /* No lockdep test, pure API */ ret = WWL(&o, &t); WARN_ON(ret != -EALREADY); ret = WWT(&o); WARN_ON(ret); t2 = t; t2.stamp++; ret = WWL(&o, &t2); WARN_ON(ret != -EDEADLK); WWU(&o); if (WWT(&o)) WWU(&o); #ifdef CONFIG_DEBUG_LOCK_ALLOC else DEBUG_LOCKS_WARN_ON(1); #endif } #ifdef CONFIG_PREEMPT_RT #define ww_mutex_base_lock(b) rt_mutex_lock(b) #define ww_mutex_base_trylock(b) rt_mutex_trylock(b) #define ww_mutex_base_lock_nest_lock(b, b2) rt_mutex_lock_nest_lock(b, b2) #define ww_mutex_base_lock_interruptible(b) rt_mutex_lock_interruptible(b) #define ww_mutex_base_lock_killable(b) rt_mutex_lock_killable(b) #define ww_mutex_base_unlock(b) rt_mutex_unlock(b) #else #define ww_mutex_base_lock(b) mutex_lock(b) #define ww_mutex_base_trylock(b) mutex_trylock(b) #define ww_mutex_base_lock_nest_lock(b, b2) mutex_lock_nest_lock(b, b2) #define ww_mutex_base_lock_interruptible(b) mutex_lock_interruptible(b) #define ww_mutex_base_lock_killable(b) mutex_lock_killable(b) #define ww_mutex_base_unlock(b) mutex_unlock(b) #endif static void ww_test_normal(void) { int ret; WWAI(&t); /* * None of the ww_mutex codepaths should be taken in the 'normal' * mutex calls. The easiest way to verify this is by using the * normal mutex calls, and making sure o.ctx is unmodified. */ /* mutex_lock (and indirectly, mutex_lock_nested) */ o.ctx = (void *)~0UL; ww_mutex_base_lock(&o.base); ww_mutex_base_unlock(&o.base); WARN_ON(o.ctx != (void *)~0UL); /* mutex_lock_interruptible (and *_nested) */ o.ctx = (void *)~0UL; ret = ww_mutex_base_lock_interruptible(&o.base); if (!ret) ww_mutex_base_unlock(&o.base); else WARN_ON(1); WARN_ON(o.ctx != (void *)~0UL); /* mutex_lock_killable (and *_nested) */ o.ctx = (void *)~0UL; ret = ww_mutex_base_lock_killable(&o.base); if (!ret) ww_mutex_base_unlock(&o.base); else WARN_ON(1); WARN_ON(o.ctx != (void *)~0UL); /* trylock, succeeding */ o.ctx = (void *)~0UL; ret = ww_mutex_base_trylock(&o.base); WARN_ON(!ret); if (ret) ww_mutex_base_unlock(&o.base); else WARN_ON(1); WARN_ON(o.ctx != (void *)~0UL); /* trylock, failing */ o.ctx = (void *)~0UL; ww_mutex_base_lock(&o.base); ret = ww_mutex_base_trylock(&o.base); WARN_ON(ret); ww_mutex_base_unlock(&o.base); WARN_ON(o.ctx != (void *)~0UL); /* nest_lock */ o.ctx = (void *)~0UL; ww_mutex_base_lock_nest_lock(&o.base, &t); ww_mutex_base_unlock(&o.base); WARN_ON(o.ctx != (void *)~0UL); } static void ww_test_two_contexts(void) { WWAI(&t); WWAI(&t2); } static void ww_test_diff_class(void) { WWAI(&t); #ifdef DEBUG_WW_MUTEXES t.ww_class = NULL; #endif WWL(&o, &t); } static void ww_test_context_done_twice(void) { WWAI(&t); WWAD(&t); WWAD(&t); WWAF(&t); } static void ww_test_context_unlock_twice(void) { WWAI(&t); WWAD(&t); WWAF(&t); WWAF(&t); } static void ww_test_context_fini_early(void) { WWAI(&t); WWL(&o, &t); WWAD(&t); WWAF(&t); } static void ww_test_context_lock_after_done(void) { WWAI(&t); WWAD(&t); WWL(&o, &t); } static void ww_test_object_unlock_twice(void) { WWL1(&o); WWU(&o); WWU(&o); } static void ww_test_object_lock_unbalanced(void) { WWAI(&t); WWL(&o, &t); t.acquired = 0; WWU(&o); WWAF(&t); } static void ww_test_object_lock_stale_context(void) { WWAI(&t); o.ctx = &t2; WWL(&o, &t); } static void ww_test_edeadlk_normal(void) { int ret; ww_mutex_base_lock(&o2.base); o2.ctx = &t2; mutex_release(&o2.base.dep_map, _THIS_IP_); WWAI(&t); t2 = t; t2.stamp--; ret = WWL(&o, &t); WARN_ON(ret); ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK); o2.ctx = NULL; mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); ww_mutex_base_unlock(&o2.base); WWU(&o); WWL(&o2, &t); } static void ww_test_edeadlk_normal_slow(void) { int ret; ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2; WWAI(&t); t2 = t; t2.stamp--; ret = WWL(&o, &t); WARN_ON(ret); ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK); o2.ctx = NULL; mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); ww_mutex_base_unlock(&o2.base); WWU(&o); ww_mutex_lock_slow(&o2, &t); } static void ww_test_edeadlk_no_unlock(void) { int ret; ww_mutex_base_lock(&o2.base); o2.ctx = &t2; mutex_release(&o2.base.dep_map, _THIS_IP_); WWAI(&t); t2 = t; t2.stamp--; ret = WWL(&o, &t); WARN_ON(ret); ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK); o2.ctx = NULL; mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); ww_mutex_base_unlock(&o2.base); WWL(&o2, &t); } static void ww_test_edeadlk_no_unlock_slow(void) { int ret; ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2; WWAI(&t); t2 = t; t2.stamp--; ret = WWL(&o, &t); WARN_ON(ret); ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK); o2.ctx = NULL; mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); ww_mutex_base_unlock(&o2.base); ww_mutex_lock_slow(&o2, &t); } static void ww_test_edeadlk_acquire_more(void) { int ret; ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2; WWAI(&t); t2 = t; t2.stamp--; ret = WWL(&o, &t); WARN_ON(ret); ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK); ret = WWL(&o3, &t); } static void ww_test_edeadlk_acquire_more_slow(void) { int ret; ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2; WWAI(&t); t2 = t; t2.stamp--; ret = WWL(&o, &t); WARN_ON(ret); ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK); ww_mutex_lock_slow(&o3, &t); } static void ww_test_edeadlk_acquire_more_edeadlk(void) { int ret; ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2; ww_mutex_base_lock(&o3.base); mutex_release(&o3.base.dep_map, _THIS_IP_); o3.ctx = &t2; WWAI(&t); t2 = t; t2.stamp--; ret = WWL(&o, &t); WARN_ON(ret); ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK); ret = WWL(&o3, &t); WARN_ON(ret != -EDEADLK); } static void ww_test_edeadlk_acquire_more_edeadlk_slow(void) { int ret; ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2; ww_mutex_base_lock(&o3.base); mutex_release(&o3.base.dep_map, _THIS_IP_); o3.ctx = &t2; WWAI(&t); t2 = t; t2.stamp--; ret = WWL(&o, &t); WARN_ON(ret); ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK); ww_mutex_lock_slow(&o3, &t); } static void ww_test_edeadlk_acquire_wrong(void) { int ret; ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2; WWAI(&t); t2 = t; t2.stamp--; ret = WWL(&o, &t); WARN_ON(ret); ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK); if (!ret) WWU(&o2); WWU(&o); ret = WWL(&o3, &t); } static void ww_test_edeadlk_acquire_wrong_slow(void) { int ret; ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2; WWAI(&t); t2 = t; t2.stamp--; ret = WWL(&o, &t); WARN_ON(ret); ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK); if (!ret) WWU(&o2); WWU(&o); ww_mutex_lock_slow(&o3, &t); } static void ww_test_spin_nest_unlocked(void) { spin_lock_nest_lock(&lock_A, &o.base); U(A); } /* This is not a deadlock, because we have X1 to serialize Y1 and Y2 */ static void ww_test_spin_nest_lock(void) { spin_lock(&lock_X1); spin_lock_nest_lock(&lock_Y1, &lock_X1); spin_lock(&lock_A); spin_lock_nest_lock(&lock_Y2, &lock_X1); spin_unlock(&lock_A); spin_unlock(&lock_Y2); spin_unlock(&lock_Y1); spin_unlock(&lock_X1); } static void ww_test_unneeded_slow(void) { WWAI(&t); ww_mutex_lock_slow(&o, &t); } static void ww_test_context_block(void) { int ret; WWAI(&t); ret = WWL(&o, &t); WARN_ON(ret); WWL1(&o2); } static void ww_test_context_try(void) { int ret; WWAI(&t); ret = WWL(&o, &t); WARN_ON(ret); ret = WWT(&o2); WARN_ON(!ret); WWU(&o2); WWU(&o); } static void ww_test_context_context(void) { int ret; WWAI(&t); ret = WWL(&o, &t); WARN_ON(ret); ret = WWL(&o2, &t); WARN_ON(ret); WWU(&o2); WWU(&o); } static void ww_test_try_block(void) { bool ret; ret = WWT(&o); WARN_ON(!ret); WWL1(&o2); WWU(&o2); WWU(&o); } static void ww_test_try_try(void) { bool ret; ret = WWT(&o); WARN_ON(!ret); ret = WWT(&o2); WARN_ON(!ret); WWU(&o2); WWU(&o); } static void ww_test_try_context(void) { int ret; ret = WWT(&o); WARN_ON(!ret); WWAI(&t); ret = WWL(&o2, &t); WARN_ON(ret); } static void ww_test_block_block(void) { WWL1(&o); WWL1(&o2); } static void ww_test_block_try(void) { bool ret; WWL1(&o); ret = WWT(&o2); WARN_ON(!ret); } static void ww_test_block_context(void) { int ret; WWL1(&o); WWAI(&t); ret = WWL(&o2, &t); WARN_ON(ret); } static void ww_test_spin_block(void) { L(A); U(A); WWL1(&o); L(A); U(A); WWU(&o); L(A); WWL1(&o); WWU(&o); U(A); } static void ww_test_spin_try(void) { bool ret; L(A); U(A); ret = WWT(&o); WARN_ON(!ret); L(A); U(A); WWU(&o); L(A); ret = WWT(&o); WARN_ON(!ret); WWU(&o); U(A); } static void ww_test_spin_context(void) { int ret; L(A); U(A); WWAI(&t); ret = WWL(&o, &t); WARN_ON(ret); L(A); U(A); WWU(&o); L(A); ret = WWL(&o, &t); WARN_ON(ret); WWU(&o); U(A); } static void ww_tests(void) { printk(" --------------------------------------------------------------------------\n"); printk(" | Wound/wait tests |\n"); printk(" ---------------------\n"); print_testname("ww api failures"); dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW); dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW); dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW); pr_cont("\n"); print_testname("ww contexts mixing"); dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW); dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW); pr_cont("\n"); print_testname("finishing ww context"); dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW); dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW); dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW); dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW); pr_cont("\n"); print_testname("locking mismatches"); dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW); dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW); dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW); pr_cont("\n"); print_testname("EDEADLK handling"); dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW); dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW); dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW); pr_cont("\n"); print_testname("spinlock nest unlocked"); dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW); pr_cont("\n"); print_testname("spinlock nest test"); dotest(ww_test_spin_nest_lock, SUCCESS, LOCKTYPE_WW); pr_cont("\n"); printk(" -----------------------------------------------------\n"); printk(" |block | try |context|\n"); printk(" -----------------------------------------------------\n"); print_testname("context"); dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW); dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW); dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW); pr_cont("\n"); print_testname("try"); dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW); dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW); dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW); pr_cont("\n"); print_testname("block"); dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW); dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW); dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW); pr_cont("\n"); print_testname("spinlock"); dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW); dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW); dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW); pr_cont("\n"); } /* * * read_lock(&A); * * spin_lock(&B); * spin_lock(&B); * read_lock(&A); * * is a deadlock. */ static void queued_read_lock_hardirq_RE_Er(void) { HARDIRQ_ENTER(); read_lock(&rwlock_A); LOCK(B); UNLOCK(B); read_unlock(&rwlock_A); HARDIRQ_EXIT(); HARDIRQ_DISABLE(); LOCK(B); read_lock(&rwlock_A); read_unlock(&rwlock_A); UNLOCK(B); HARDIRQ_ENABLE(); } /* * * spin_lock(&B); * * read_lock(&A); * read_lock(&A); * spin_lock(&B); * * is not a deadlock. */ static void queued_read_lock_hardirq_ER_rE(void) { HARDIRQ_ENTER(); LOCK(B); read_lock(&rwlock_A); read_unlock(&rwlock_A); UNLOCK(B); HARDIRQ_EXIT(); HARDIRQ_DISABLE(); read_lock(&rwlock_A); LOCK(B); UNLOCK(B); read_unlock(&rwlock_A); HARDIRQ_ENABLE(); } /* * * spin_lock(&B); * read_lock(&A); * * spin_lock(&B); * read_lock(&A); * * is a deadlock. Because the two read_lock()s are both non-recursive readers. */ static void queued_read_lock_hardirq_inversion(void) { HARDIRQ_ENTER(); LOCK(B); UNLOCK(B); HARDIRQ_EXIT(); HARDIRQ_DISABLE(); LOCK(B); read_lock(&rwlock_A); read_unlock(&rwlock_A); UNLOCK(B); HARDIRQ_ENABLE(); read_lock(&rwlock_A); read_unlock(&rwlock_A); } static void queued_read_lock_tests(void) { printk(" --------------------------------------------------------------------------\n"); printk(" | queued read lock tests |\n"); printk(" ---------------------------\n"); print_testname("hardirq read-lock/lock-read"); dotest(queued_read_lock_hardirq_RE_Er, FAILURE, LOCKTYPE_RWLOCK); pr_cont("\n"); print_testname("hardirq lock-read/read-lock"); dotest(queued_read_lock_hardirq_ER_rE, SUCCESS, LOCKTYPE_RWLOCK); pr_cont("\n"); print_testname("hardirq inversion"); dotest(queued_read_lock_hardirq_inversion, FAILURE, LOCKTYPE_RWLOCK); pr_cont("\n"); } static void fs_reclaim_correct_nesting(void) { fs_reclaim_acquire(GFP_KERNEL); might_alloc(GFP_NOFS); fs_reclaim_release(GFP_KERNEL); } static void fs_reclaim_wrong_nesting(void) { fs_reclaim_acquire(GFP_KERNEL); might_alloc(GFP_KERNEL); fs_reclaim_release(GFP_KERNEL); } static void fs_reclaim_protected_nesting(void) { unsigned int flags; fs_reclaim_acquire(GFP_KERNEL); flags = memalloc_nofs_save(); might_alloc(GFP_KERNEL); memalloc_nofs_restore(flags); fs_reclaim_release(GFP_KERNEL); } static void fs_reclaim_tests(void) { printk(" --------------------\n"); printk(" | fs_reclaim tests |\n"); printk(" --------------------\n"); print_testname("correct nesting"); dotest(fs_reclaim_correct_nesting, SUCCESS, 0); pr_cont("\n"); print_testname("wrong nesting"); dotest(fs_reclaim_wrong_nesting, FAILURE, 0); pr_cont("\n"); print_testname("protected nesting"); dotest(fs_reclaim_protected_nesting, SUCCESS, 0); pr_cont("\n"); } /* Defines guard classes to create contexts */ DEFINE_LOCK_GUARD_0(HARDIRQ, HARDIRQ_ENTER(), HARDIRQ_EXIT()) DEFINE_LOCK_GUARD_0(NOTTHREADED_HARDIRQ, do { local_irq_disable(); __irq_enter(); WARN_ON(!in_irq()); } while(0), HARDIRQ_EXIT()) DEFINE_LOCK_GUARD_0(SOFTIRQ, SOFTIRQ_ENTER(), SOFTIRQ_EXIT()) /* Define RCU guards, should go away when RCU has its own guard definitions */ DEFINE_LOCK_GUARD_0(RCU, rcu_read_lock(), rcu_read_unlock()) DEFINE_LOCK_GUARD_0(RCU_BH, rcu_read_lock_bh(), rcu_read_unlock_bh()) DEFINE_LOCK_GUARD_0(RCU_SCHED, rcu_read_lock_sched(), rcu_read_unlock_sched()) #define GENERATE_2_CONTEXT_TESTCASE(outer, outer_lock, inner, inner_lock) \ \ static void __maybe_unused inner##_in_##outer(void) \ { \ /* Relies the reversed clean-up ordering: inner first */ \ guard(outer)(outer_lock); \ guard(inner)(inner_lock); \ } /* * wait contexts (considering PREEMPT_RT) * * o: inner is allowed in outer * x: inner is disallowed in outer * * \ inner | RCU | RAW_SPIN | SPIN | MUTEX * outer \ | | | | * ---------------+-------+----------+------+------- * HARDIRQ | o | o | o | x * ---------------+-------+----------+------+------- * NOTTHREADED_IRQ| o | o | x | x * ---------------+-------+----------+------+------- * SOFTIRQ | o | o | o | x * ---------------+-------+----------+------+------- * RCU | o | o | o | x * ---------------+-------+----------+------+------- * RCU_BH | o | o | o | x * ---------------+-------+----------+------+------- * RCU_SCHED | o | o | x | x * ---------------+-------+----------+------+------- * RAW_SPIN | o | o | x | x * ---------------+-------+----------+------+------- * SPIN | o | o | o | x * ---------------+-------+----------+------+------- * MUTEX | o | o | o | o * ---------------+-------+----------+------+------- */ #define GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(inner, inner_lock) \ GENERATE_2_CONTEXT_TESTCASE(HARDIRQ, , inner, inner_lock) \ GENERATE_2_CONTEXT_TESTCASE(NOTTHREADED_HARDIRQ, , inner, inner_lock) \ GENERATE_2_CONTEXT_TESTCASE(SOFTIRQ, , inner, inner_lock) \ GENERATE_2_CONTEXT_TESTCASE(RCU, , inner, inner_lock) \ GENERATE_2_CONTEXT_TESTCASE(RCU_BH, , inner, inner_lock) \ GENERATE_2_CONTEXT_TESTCASE(RCU_SCHED, , inner, inner_lock) \ GENERATE_2_CONTEXT_TESTCASE(raw_spinlock, &raw_lock_A, inner, inner_lock) \ GENERATE_2_CONTEXT_TESTCASE(spinlock, &lock_A, inner, inner_lock) \ GENERATE_2_CONTEXT_TESTCASE(mutex, &mutex_A, inner, inner_lock) GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RCU, ) GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(raw_spinlock, &raw_lock_B) GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(spinlock, &lock_B) GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(mutex, &mutex_B) /* the outer context allows all kinds of preemption */ #define DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(outer) \ dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \ dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ dotest(spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ dotest(mutex_in_##outer, SUCCESS, LOCKTYPE_MUTEX); \ /* * the outer context only allows the preemption introduced by spinlock_t (which * is a sleepable lock for PREEMPT_RT) */ #define DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(outer) \ dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \ dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ dotest(spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ dotest(mutex_in_##outer, FAILURE, LOCKTYPE_MUTEX); \ /* the outer doesn't allows any kind of preemption */ #define DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(outer) \ dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \ dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ dotest(spinlock_in_##outer, FAILURE, LOCKTYPE_SPIN); \ dotest(mutex_in_##outer, FAILURE, LOCKTYPE_MUTEX); \ static void wait_context_tests(void) { printk(" --------------------------------------------------------------------------\n"); printk(" | wait context tests |\n"); printk(" --------------------------------------------------------------------------\n"); printk(" | rcu | raw | spin |mutex |\n"); printk(" --------------------------------------------------------------------------\n"); print_testname("in hardirq context"); DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(HARDIRQ); pr_cont("\n"); print_testname("in hardirq context (not threaded)"); DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(NOTTHREADED_HARDIRQ); pr_cont("\n"); print_testname("in softirq context"); DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SOFTIRQ); pr_cont("\n"); print_testname("in RCU context"); DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU); pr_cont("\n"); print_testname("in RCU-bh context"); DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU_BH); pr_cont("\n"); print_testname("in RCU-sched context"); DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RCU_SCHED); pr_cont("\n"); print_testname("in RAW_SPINLOCK context"); DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(raw_spinlock); pr_cont("\n"); print_testname("in SPINLOCK context"); DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(spinlock); pr_cont("\n"); print_testname("in MUTEX context"); DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(mutex); pr_cont("\n"); } static void local_lock_2(void) { local_lock(&local_A); /* IRQ-ON */ local_unlock(&local_A); HARDIRQ_ENTER(); spin_lock(&lock_A); /* IN-IRQ */ spin_unlock(&lock_A); HARDIRQ_EXIT() HARDIRQ_DISABLE(); spin_lock(&lock_A); local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle, false */ local_unlock(&local_A); spin_unlock(&lock_A); HARDIRQ_ENABLE(); } static void local_lock_3A(void) { local_lock(&local_A); /* IRQ-ON */ spin_lock(&lock_B); /* IRQ-ON */ spin_unlock(&lock_B); local_unlock(&local_A); HARDIRQ_ENTER(); spin_lock(&lock_A); /* IN-IRQ */ spin_unlock(&lock_A); HARDIRQ_EXIT() HARDIRQ_DISABLE(); spin_lock(&lock_A); local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */ local_unlock(&local_A); spin_unlock(&lock_A); HARDIRQ_ENABLE(); } static void local_lock_3B(void) { local_lock(&local_A); /* IRQ-ON */ spin_lock(&lock_B); /* IRQ-ON */ spin_unlock(&lock_B); local_unlock(&local_A); HARDIRQ_ENTER(); spin_lock(&lock_A); /* IN-IRQ */ spin_unlock(&lock_A); HARDIRQ_EXIT() HARDIRQ_DISABLE(); spin_lock(&lock_A); local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */ local_unlock(&local_A); spin_unlock(&lock_A); HARDIRQ_ENABLE(); HARDIRQ_DISABLE(); spin_lock(&lock_A); spin_lock(&lock_B); /* IN-IRQ <-> IRQ-ON cycle, true */ spin_unlock(&lock_B); spin_unlock(&lock_A); HARDIRQ_DISABLE(); } static void local_lock_tests(void) { printk(" --------------------------------------------------------------------------\n"); printk(" | local_lock tests |\n"); printk(" ---------------------\n"); print_testname("local_lock inversion 2"); dotest(local_lock_2, SUCCESS, LOCKTYPE_LL); pr_cont("\n"); print_testname("local_lock inversion 3A"); dotest(local_lock_3A, SUCCESS, LOCKTYPE_LL); pr_cont("\n"); print_testname("local_lock inversion 3B"); dotest(local_lock_3B, FAILURE, LOCKTYPE_LL); pr_cont("\n"); } static void hardirq_deadlock_softirq_not_deadlock(void) { /* mutex_A is hardirq-unsafe and softirq-unsafe */ /* mutex_A -> lock_C */ mutex_lock(&mutex_A); HARDIRQ_DISABLE(); spin_lock(&lock_C); spin_unlock(&lock_C); HARDIRQ_ENABLE(); mutex_unlock(&mutex_A); /* lock_A is hardirq-safe */ HARDIRQ_ENTER(); spin_lock(&lock_A); spin_unlock(&lock_A); HARDIRQ_EXIT(); /* lock_A -> lock_B */ HARDIRQ_DISABLE(); spin_lock(&lock_A); spin_lock(&lock_B); spin_unlock(&lock_B); spin_unlock(&lock_A); HARDIRQ_ENABLE(); /* lock_B -> lock_C */ HARDIRQ_DISABLE(); spin_lock(&lock_B); spin_lock(&lock_C); spin_unlock(&lock_C); spin_unlock(&lock_B); HARDIRQ_ENABLE(); /* lock_D is softirq-safe */ SOFTIRQ_ENTER(); spin_lock(&lock_D); spin_unlock(&lock_D); SOFTIRQ_EXIT(); /* And lock_D is hardirq-unsafe */ SOFTIRQ_DISABLE(); spin_lock(&lock_D); spin_unlock(&lock_D); SOFTIRQ_ENABLE(); /* * mutex_A -> lock_C -> lock_D is softirq-unsafe -> softirq-safe, not * deadlock. * * lock_A -> lock_B -> lock_C -> lock_D is hardirq-safe -> * hardirq-unsafe, deadlock. */ HARDIRQ_DISABLE(); spin_lock(&lock_C); spin_lock(&lock_D); spin_unlock(&lock_D); spin_unlock(&lock_C); HARDIRQ_ENABLE(); } void locking_selftest(void) { /* * Got a locking failure before the selftest ran? */ if (!debug_locks) { printk("----------------------------------\n"); printk("| Locking API testsuite disabled |\n"); printk("----------------------------------\n"); return; } /* * treats read_lock() as recursive read locks for testing purpose */ force_read_lock_recursive = 1; /* * Run the testsuite: */ printk("------------------------\n"); printk("| Locking API testsuite:\n"); printk("----------------------------------------------------------------------------\n"); printk(" | spin |wlock |rlock |mutex | wsem | rsem |rtmutex\n"); printk(" --------------------------------------------------------------------------\n"); init_shared_classes(); lockdep_set_selftest_task(current); DO_TESTCASE_6R("A-A deadlock", AA); DO_TESTCASE_6R("A-B-B-A deadlock", ABBA); DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA); DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC); DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA); DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA); DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA); DO_TESTCASE_6("double unlock", double_unlock); DO_TESTCASE_6("initialize held", init_held); printk(" --------------------------------------------------------------------------\n"); print_testname("recursive read-lock"); pr_cont(" |"); dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM); pr_cont("\n"); print_testname("recursive read-lock #2"); pr_cont(" |"); dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM); pr_cont("\n"); print_testname("mixed read-write-lock"); pr_cont(" |"); dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM); pr_cont("\n"); print_testname("mixed write-read-lock"); pr_cont(" |"); dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM); pr_cont("\n"); print_testname("mixed read-lock/lock-write ABBA"); pr_cont(" |"); dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rwsem_ABBA1, FAILURE, LOCKTYPE_RWSEM); print_testname("mixed read-lock/lock-read ABBA"); pr_cont(" |"); dotest(rlock_ABBA2, SUCCESS, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rwsem_ABBA2, FAILURE, LOCKTYPE_RWSEM); print_testname("mixed write-lock/lock-write ABBA"); pr_cont(" |"); dotest(rlock_ABBA3, FAILURE, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rwsem_ABBA3, FAILURE, LOCKTYPE_RWSEM); print_testname("chain cached mixed R-L/L-W ABBA"); pr_cont(" |"); dotest(rlock_chaincache_ABBA1, FAILURE, LOCKTYPE_RWLOCK); DO_TESTCASE_6x1RRB("rlock W1R2/W2R3/W3R1", W1R2_W2R3_W3R1); DO_TESTCASE_6x1RRB("rlock W1W2/R2R3/W3R1", W1W2_R2R3_W3R1); DO_TESTCASE_6x1RR("rlock W1W2/R2R3/R3W1", W1W2_R2R3_R3W1); DO_TESTCASE_6x1RR("rlock W1R2/R2R3/W3W1", W1R2_R2R3_W3W1); printk(" --------------------------------------------------------------------------\n"); /* * irq-context testcases: */ DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1); NON_RT(DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A)); DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B); DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3); DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4); DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion); DO_TESTCASE_6x2x2RW("irq read-recursion", irq_read_recursion); DO_TESTCASE_6x2x2RW("irq read-recursion #2", irq_read_recursion2); DO_TESTCASE_6x2x2RW("irq read-recursion #3", irq_read_recursion3); ww_tests(); force_read_lock_recursive = 0; /* * queued_read_lock() specific test cases can be put here */ if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS)) queued_read_lock_tests(); fs_reclaim_tests(); /* Wait context test cases that are specific for RAW_LOCK_NESTING */ if (IS_ENABLED(CONFIG_PROVE_RAW_LOCK_NESTING)) wait_context_tests(); local_lock_tests(); print_testname("hardirq_unsafe_softirq_safe"); dotest(hardirq_deadlock_softirq_not_deadlock, FAILURE, LOCKTYPE_SPECIAL); pr_cont("\n"); if (unexpected_testcase_failures) { printk("-----------------------------------------------------------------\n"); debug_locks = 0; printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n", unexpected_testcase_failures, testcase_total); printk("-----------------------------------------------------------------\n"); } else if (expected_testcase_failures && testcase_successes) { printk("--------------------------------------------------------\n"); printk("%3d out of %3d testcases failed, as expected. |\n", expected_testcase_failures, testcase_total); printk("----------------------------------------------------\n"); debug_locks = 1; } else if (expected_testcase_failures && !testcase_successes) { printk("--------------------------------------------------------\n"); printk("All %3d testcases failed, as expected. |\n", expected_testcase_failures); printk("----------------------------------------\n"); debug_locks = 1; } else { printk("-------------------------------------------------------\n"); printk("Good, all %3d testcases passed! |\n", testcase_successes); printk("---------------------------------\n"); debug_locks = 1; } lockdep_set_selftest_task(NULL); debug_locks_silent = 0; }