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1902 lines
40 KiB
1902 lines
40 KiB
/* |
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* lib/locking-selftest.c |
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* |
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* Testsuite for various locking APIs: spinlocks, rwlocks, |
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* mutexes and rw-semaphores. |
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* |
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* It is checking both false positives and false negatives. |
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* |
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* Started by Ingo Molnar: |
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* |
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* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> |
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*/ |
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#include <linux/rwsem.h> |
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#include <linux/mutex.h> |
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#include <linux/ww_mutex.h> |
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#include <linux/sched.h> |
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#include <linux/delay.h> |
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#include <linux/lockdep.h> |
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#include <linux/spinlock.h> |
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#include <linux/kallsyms.h> |
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#include <linux/interrupt.h> |
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#include <linux/debug_locks.h> |
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#include <linux/irqflags.h> |
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|
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/* |
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* Change this to 1 if you want to see the failure printouts: |
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*/ |
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static unsigned int debug_locks_verbose; |
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static DEFINE_WW_CLASS(ww_lockdep); |
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static int __init setup_debug_locks_verbose(char *str) |
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{ |
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get_option(&str, &debug_locks_verbose); |
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return 1; |
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} |
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__setup("debug_locks_verbose=", setup_debug_locks_verbose); |
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#define FAILURE 0 |
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#define SUCCESS 1 |
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#define LOCKTYPE_SPIN 0x1 |
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#define LOCKTYPE_RWLOCK 0x2 |
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#define LOCKTYPE_MUTEX 0x4 |
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#define LOCKTYPE_RWSEM 0x8 |
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#define LOCKTYPE_WW 0x10 |
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static struct ww_acquire_ctx t, t2; |
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static struct ww_mutex o, o2, o3; |
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/* |
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* Normal standalone locks, for the circular and irq-context |
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* dependency tests: |
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*/ |
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static DEFINE_RAW_SPINLOCK(lock_A); |
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static DEFINE_RAW_SPINLOCK(lock_B); |
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static DEFINE_RAW_SPINLOCK(lock_C); |
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static DEFINE_RAW_SPINLOCK(lock_D); |
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static DEFINE_RWLOCK(rwlock_A); |
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static DEFINE_RWLOCK(rwlock_B); |
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static DEFINE_RWLOCK(rwlock_C); |
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static DEFINE_RWLOCK(rwlock_D); |
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static DEFINE_MUTEX(mutex_A); |
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static DEFINE_MUTEX(mutex_B); |
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static DEFINE_MUTEX(mutex_C); |
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static DEFINE_MUTEX(mutex_D); |
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static DECLARE_RWSEM(rwsem_A); |
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static DECLARE_RWSEM(rwsem_B); |
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static DECLARE_RWSEM(rwsem_C); |
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static DECLARE_RWSEM(rwsem_D); |
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/* |
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* Locks that we initialize dynamically as well so that |
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* e.g. X1 and X2 becomes two instances of the same class, |
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* but X* and Y* are different classes. We do this so that |
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* we do not trigger a real lockup: |
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*/ |
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static DEFINE_RAW_SPINLOCK(lock_X1); |
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static DEFINE_RAW_SPINLOCK(lock_X2); |
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static DEFINE_RAW_SPINLOCK(lock_Y1); |
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static DEFINE_RAW_SPINLOCK(lock_Y2); |
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static DEFINE_RAW_SPINLOCK(lock_Z1); |
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static DEFINE_RAW_SPINLOCK(lock_Z2); |
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static DEFINE_RWLOCK(rwlock_X1); |
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static DEFINE_RWLOCK(rwlock_X2); |
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static DEFINE_RWLOCK(rwlock_Y1); |
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static DEFINE_RWLOCK(rwlock_Y2); |
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static DEFINE_RWLOCK(rwlock_Z1); |
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static DEFINE_RWLOCK(rwlock_Z2); |
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static DEFINE_MUTEX(mutex_X1); |
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static DEFINE_MUTEX(mutex_X2); |
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static DEFINE_MUTEX(mutex_Y1); |
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static DEFINE_MUTEX(mutex_Y2); |
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static DEFINE_MUTEX(mutex_Z1); |
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static DEFINE_MUTEX(mutex_Z2); |
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static DECLARE_RWSEM(rwsem_X1); |
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static DECLARE_RWSEM(rwsem_X2); |
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static DECLARE_RWSEM(rwsem_Y1); |
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static DECLARE_RWSEM(rwsem_Y2); |
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static DECLARE_RWSEM(rwsem_Z1); |
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static DECLARE_RWSEM(rwsem_Z2); |
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/* |
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* non-inlined runtime initializers, to let separate locks share |
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* the same lock-class: |
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*/ |
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#define INIT_CLASS_FUNC(class) \ |
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static noinline void \ |
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init_class_##class(raw_spinlock_t *lock, rwlock_t *rwlock, \ |
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struct mutex *mutex, struct rw_semaphore *rwsem)\ |
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{ \ |
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raw_spin_lock_init(lock); \ |
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rwlock_init(rwlock); \ |
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mutex_init(mutex); \ |
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init_rwsem(rwsem); \ |
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} |
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INIT_CLASS_FUNC(X) |
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INIT_CLASS_FUNC(Y) |
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INIT_CLASS_FUNC(Z) |
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static void init_shared_classes(void) |
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{ |
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init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1); |
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init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2); |
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init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1); |
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init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2); |
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init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1); |
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init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2); |
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} |
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/* |
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* For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests. |
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* The following functions use a lock from a simulated hardirq/softirq |
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* context, causing the locks to be marked as hardirq-safe/softirq-safe: |
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*/ |
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#define HARDIRQ_DISABLE local_irq_disable |
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#define HARDIRQ_ENABLE local_irq_enable |
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#define HARDIRQ_ENTER() \ |
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local_irq_disable(); \ |
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__irq_enter(); \ |
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WARN_ON(!in_irq()); |
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#define HARDIRQ_EXIT() \ |
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__irq_exit(); \ |
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local_irq_enable(); |
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#define SOFTIRQ_DISABLE local_bh_disable |
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#define SOFTIRQ_ENABLE local_bh_enable |
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#define SOFTIRQ_ENTER() \ |
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local_bh_disable(); \ |
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local_irq_disable(); \ |
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lockdep_softirq_enter(); \ |
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WARN_ON(!in_softirq()); |
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#define SOFTIRQ_EXIT() \ |
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lockdep_softirq_exit(); \ |
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local_irq_enable(); \ |
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local_bh_enable(); |
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/* |
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* Shortcuts for lock/unlock API variants, to keep |
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* the testcases compact: |
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*/ |
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#define L(x) raw_spin_lock(&lock_##x) |
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#define U(x) raw_spin_unlock(&lock_##x) |
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#define LU(x) L(x); U(x) |
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#define SI(x) raw_spin_lock_init(&lock_##x) |
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#define WL(x) write_lock(&rwlock_##x) |
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#define WU(x) write_unlock(&rwlock_##x) |
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#define WLU(x) WL(x); WU(x) |
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#define RL(x) read_lock(&rwlock_##x) |
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#define RU(x) read_unlock(&rwlock_##x) |
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#define RLU(x) RL(x); RU(x) |
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#define RWI(x) rwlock_init(&rwlock_##x) |
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#define ML(x) mutex_lock(&mutex_##x) |
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#define MU(x) mutex_unlock(&mutex_##x) |
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#define MI(x) mutex_init(&mutex_##x) |
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#define WSL(x) down_write(&rwsem_##x) |
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#define WSU(x) up_write(&rwsem_##x) |
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#define RSL(x) down_read(&rwsem_##x) |
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#define RSU(x) up_read(&rwsem_##x) |
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#define RWSI(x) init_rwsem(&rwsem_##x) |
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#ifndef CONFIG_DEBUG_WW_MUTEX_SLOWPATH |
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#define WWAI(x) ww_acquire_init(x, &ww_lockdep) |
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#else |
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#define WWAI(x) do { ww_acquire_init(x, &ww_lockdep); (x)->deadlock_inject_countdown = ~0U; } while (0) |
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#endif |
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#define WWAD(x) ww_acquire_done(x) |
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#define WWAF(x) ww_acquire_fini(x) |
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#define WWL(x, c) ww_mutex_lock(x, c) |
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#define WWT(x) ww_mutex_trylock(x) |
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#define WWL1(x) ww_mutex_lock(x, NULL) |
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#define WWU(x) ww_mutex_unlock(x) |
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#define LOCK_UNLOCK_2(x,y) LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x) |
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/* |
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* Generate different permutations of the same testcase, using |
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* the same basic lock-dependency/state events: |
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*/ |
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#define GENERATE_TESTCASE(name) \ |
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\ |
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static void name(void) { E(); } |
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#define GENERATE_PERMUTATIONS_2_EVENTS(name) \ |
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\ |
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static void name##_12(void) { E1(); E2(); } \ |
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static void name##_21(void) { E2(); E1(); } |
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#define GENERATE_PERMUTATIONS_3_EVENTS(name) \ |
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\ |
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static void name##_123(void) { E1(); E2(); E3(); } \ |
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static void name##_132(void) { E1(); E3(); E2(); } \ |
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static void name##_213(void) { E2(); E1(); E3(); } \ |
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static void name##_231(void) { E2(); E3(); E1(); } \ |
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static void name##_312(void) { E3(); E1(); E2(); } \ |
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static void name##_321(void) { E3(); E2(); E1(); } |
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/* |
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* AA deadlock: |
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*/ |
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#define E() \ |
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\ |
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LOCK(X1); \ |
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LOCK(X2); /* this one should fail */ |
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/* |
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* 6 testcases: |
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*/ |
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#include "locking-selftest-spin.h" |
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GENERATE_TESTCASE(AA_spin) |
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#include "locking-selftest-wlock.h" |
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GENERATE_TESTCASE(AA_wlock) |
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#include "locking-selftest-rlock.h" |
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GENERATE_TESTCASE(AA_rlock) |
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#include "locking-selftest-mutex.h" |
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GENERATE_TESTCASE(AA_mutex) |
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#include "locking-selftest-wsem.h" |
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GENERATE_TESTCASE(AA_wsem) |
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#include "locking-selftest-rsem.h" |
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GENERATE_TESTCASE(AA_rsem) |
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#undef E |
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/* |
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* Special-case for read-locking, they are |
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* allowed to recurse on the same lock class: |
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*/ |
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static void rlock_AA1(void) |
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{ |
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RL(X1); |
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RL(X1); // this one should NOT fail |
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} |
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static void rlock_AA1B(void) |
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{ |
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RL(X1); |
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RL(X2); // this one should NOT fail |
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} |
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static void rsem_AA1(void) |
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{ |
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RSL(X1); |
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RSL(X1); // this one should fail |
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} |
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static void rsem_AA1B(void) |
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{ |
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RSL(X1); |
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RSL(X2); // this one should fail |
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} |
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/* |
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* The mixing of read and write locks is not allowed: |
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*/ |
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static void rlock_AA2(void) |
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{ |
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RL(X1); |
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WL(X2); // this one should fail |
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} |
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static void rsem_AA2(void) |
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{ |
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RSL(X1); |
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WSL(X2); // this one should fail |
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} |
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static void rlock_AA3(void) |
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{ |
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WL(X1); |
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RL(X2); // this one should fail |
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} |
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static void rsem_AA3(void) |
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{ |
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WSL(X1); |
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RSL(X2); // this one should fail |
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} |
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/* |
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* ABBA deadlock: |
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*/ |
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#define E() \ |
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\ |
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LOCK_UNLOCK_2(A, B); \ |
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LOCK_UNLOCK_2(B, A); /* fail */ |
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/* |
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* 6 testcases: |
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*/ |
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#include "locking-selftest-spin.h" |
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GENERATE_TESTCASE(ABBA_spin) |
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#include "locking-selftest-wlock.h" |
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GENERATE_TESTCASE(ABBA_wlock) |
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#include "locking-selftest-rlock.h" |
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GENERATE_TESTCASE(ABBA_rlock) |
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#include "locking-selftest-mutex.h" |
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GENERATE_TESTCASE(ABBA_mutex) |
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#include "locking-selftest-wsem.h" |
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GENERATE_TESTCASE(ABBA_wsem) |
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#include "locking-selftest-rsem.h" |
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GENERATE_TESTCASE(ABBA_rsem) |
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#undef E |
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/* |
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* AB BC CA deadlock: |
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*/ |
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#define E() \ |
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\ |
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LOCK_UNLOCK_2(A, B); \ |
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LOCK_UNLOCK_2(B, C); \ |
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LOCK_UNLOCK_2(C, A); /* fail */ |
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/* |
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* 6 testcases: |
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*/ |
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#include "locking-selftest-spin.h" |
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GENERATE_TESTCASE(ABBCCA_spin) |
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#include "locking-selftest-wlock.h" |
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GENERATE_TESTCASE(ABBCCA_wlock) |
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#include "locking-selftest-rlock.h" |
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GENERATE_TESTCASE(ABBCCA_rlock) |
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#include "locking-selftest-mutex.h" |
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GENERATE_TESTCASE(ABBCCA_mutex) |
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#include "locking-selftest-wsem.h" |
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GENERATE_TESTCASE(ABBCCA_wsem) |
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#include "locking-selftest-rsem.h" |
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GENERATE_TESTCASE(ABBCCA_rsem) |
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#undef E |
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/* |
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* AB CA BC deadlock: |
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*/ |
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#define E() \ |
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\ |
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LOCK_UNLOCK_2(A, B); \ |
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LOCK_UNLOCK_2(C, A); \ |
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LOCK_UNLOCK_2(B, C); /* fail */ |
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/* |
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* 6 testcases: |
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*/ |
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#include "locking-selftest-spin.h" |
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GENERATE_TESTCASE(ABCABC_spin) |
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#include "locking-selftest-wlock.h" |
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GENERATE_TESTCASE(ABCABC_wlock) |
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#include "locking-selftest-rlock.h" |
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GENERATE_TESTCASE(ABCABC_rlock) |
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#include "locking-selftest-mutex.h" |
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GENERATE_TESTCASE(ABCABC_mutex) |
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#include "locking-selftest-wsem.h" |
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GENERATE_TESTCASE(ABCABC_wsem) |
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#include "locking-selftest-rsem.h" |
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GENERATE_TESTCASE(ABCABC_rsem) |
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#undef E |
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/* |
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* AB BC CD DA deadlock: |
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*/ |
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#define E() \ |
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\ |
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LOCK_UNLOCK_2(A, B); \ |
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LOCK_UNLOCK_2(B, C); \ |
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LOCK_UNLOCK_2(C, D); \ |
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LOCK_UNLOCK_2(D, A); /* fail */ |
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/* |
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* 6 testcases: |
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*/ |
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#include "locking-selftest-spin.h" |
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GENERATE_TESTCASE(ABBCCDDA_spin) |
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#include "locking-selftest-wlock.h" |
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GENERATE_TESTCASE(ABBCCDDA_wlock) |
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#include "locking-selftest-rlock.h" |
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GENERATE_TESTCASE(ABBCCDDA_rlock) |
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#include "locking-selftest-mutex.h" |
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GENERATE_TESTCASE(ABBCCDDA_mutex) |
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#include "locking-selftest-wsem.h" |
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GENERATE_TESTCASE(ABBCCDDA_wsem) |
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#include "locking-selftest-rsem.h" |
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GENERATE_TESTCASE(ABBCCDDA_rsem) |
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#undef E |
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/* |
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* AB CD BD DA deadlock: |
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*/ |
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#define E() \ |
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\ |
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LOCK_UNLOCK_2(A, B); \ |
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LOCK_UNLOCK_2(C, D); \ |
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LOCK_UNLOCK_2(B, D); \ |
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LOCK_UNLOCK_2(D, A); /* fail */ |
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/* |
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* 6 testcases: |
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*/ |
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#include "locking-selftest-spin.h" |
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GENERATE_TESTCASE(ABCDBDDA_spin) |
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#include "locking-selftest-wlock.h" |
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GENERATE_TESTCASE(ABCDBDDA_wlock) |
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#include "locking-selftest-rlock.h" |
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GENERATE_TESTCASE(ABCDBDDA_rlock) |
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#include "locking-selftest-mutex.h" |
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GENERATE_TESTCASE(ABCDBDDA_mutex) |
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#include "locking-selftest-wsem.h" |
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GENERATE_TESTCASE(ABCDBDDA_wsem) |
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#include "locking-selftest-rsem.h" |
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GENERATE_TESTCASE(ABCDBDDA_rsem) |
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#undef E |
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/* |
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* AB CD BC DA deadlock: |
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*/ |
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#define E() \ |
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\ |
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LOCK_UNLOCK_2(A, B); \ |
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LOCK_UNLOCK_2(C, D); \ |
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LOCK_UNLOCK_2(B, C); \ |
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LOCK_UNLOCK_2(D, A); /* fail */ |
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/* |
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* 6 testcases: |
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*/ |
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#include "locking-selftest-spin.h" |
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GENERATE_TESTCASE(ABCDBCDA_spin) |
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#include "locking-selftest-wlock.h" |
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GENERATE_TESTCASE(ABCDBCDA_wlock) |
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#include "locking-selftest-rlock.h" |
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GENERATE_TESTCASE(ABCDBCDA_rlock) |
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#include "locking-selftest-mutex.h" |
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GENERATE_TESTCASE(ABCDBCDA_mutex) |
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#include "locking-selftest-wsem.h" |
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GENERATE_TESTCASE(ABCDBCDA_wsem) |
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#include "locking-selftest-rsem.h" |
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GENERATE_TESTCASE(ABCDBCDA_rsem) |
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|
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#undef E |
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|
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/* |
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* Double unlock: |
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*/ |
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#define E() \ |
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\ |
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LOCK(A); \ |
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UNLOCK(A); \ |
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UNLOCK(A); /* fail */ |
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|
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/* |
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* 6 testcases: |
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*/ |
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#include "locking-selftest-spin.h" |
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GENERATE_TESTCASE(double_unlock_spin) |
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#include "locking-selftest-wlock.h" |
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GENERATE_TESTCASE(double_unlock_wlock) |
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#include "locking-selftest-rlock.h" |
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GENERATE_TESTCASE(double_unlock_rlock) |
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#include "locking-selftest-mutex.h" |
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GENERATE_TESTCASE(double_unlock_mutex) |
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#include "locking-selftest-wsem.h" |
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GENERATE_TESTCASE(double_unlock_wsem) |
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#include "locking-selftest-rsem.h" |
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GENERATE_TESTCASE(double_unlock_rsem) |
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|
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#undef E |
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|
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/* |
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* Bad unlock ordering: |
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*/ |
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#define E() \ |
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\ |
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LOCK(A); \ |
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LOCK(B); \ |
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UNLOCK(A); /* fail */ \ |
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UNLOCK(B); |
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|
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/* |
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* 6 testcases: |
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*/ |
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#include "locking-selftest-spin.h" |
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GENERATE_TESTCASE(bad_unlock_order_spin) |
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#include "locking-selftest-wlock.h" |
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GENERATE_TESTCASE(bad_unlock_order_wlock) |
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#include "locking-selftest-rlock.h" |
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GENERATE_TESTCASE(bad_unlock_order_rlock) |
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#include "locking-selftest-mutex.h" |
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GENERATE_TESTCASE(bad_unlock_order_mutex) |
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#include "locking-selftest-wsem.h" |
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GENERATE_TESTCASE(bad_unlock_order_wsem) |
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#include "locking-selftest-rsem.h" |
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GENERATE_TESTCASE(bad_unlock_order_rsem) |
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|
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#undef E |
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|
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/* |
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* initializing a held lock: |
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*/ |
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#define E() \ |
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\ |
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LOCK(A); \ |
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INIT(A); /* fail */ |
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|
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/* |
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* 6 testcases: |
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*/ |
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#include "locking-selftest-spin.h" |
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GENERATE_TESTCASE(init_held_spin) |
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#include "locking-selftest-wlock.h" |
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GENERATE_TESTCASE(init_held_wlock) |
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#include "locking-selftest-rlock.h" |
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GENERATE_TESTCASE(init_held_rlock) |
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#include "locking-selftest-mutex.h" |
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GENERATE_TESTCASE(init_held_mutex) |
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#include "locking-selftest-wsem.h" |
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GENERATE_TESTCASE(init_held_wsem) |
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#include "locking-selftest-rsem.h" |
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GENERATE_TESTCASE(init_held_rsem) |
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|
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#undef E |
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|
|
/* |
|
* locking an irq-safe lock with irqs enabled: |
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*/ |
|
#define E1() \ |
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\ |
|
IRQ_ENTER(); \ |
|
LOCK(A); \ |
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UNLOCK(A); \ |
|
IRQ_EXIT(); |
|
|
|
#define E2() \ |
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\ |
|
LOCK(A); \ |
|
UNLOCK(A); |
|
|
|
/* |
|
* Generate 24 testcases: |
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*/ |
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#include "locking-selftest-spin-hardirq.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin) |
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|
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#include "locking-selftest-rlock-hardirq.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock) |
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|
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#include "locking-selftest-wlock-hardirq.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock) |
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|
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#include "locking-selftest-spin-softirq.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin) |
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|
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#include "locking-selftest-rlock-softirq.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock) |
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|
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#include "locking-selftest-wlock-softirq.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock) |
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|
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#undef E1 |
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#undef E2 |
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|
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/* |
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* Enabling hardirqs with a softirq-safe lock held: |
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*/ |
|
#define E1() \ |
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\ |
|
SOFTIRQ_ENTER(); \ |
|
LOCK(A); \ |
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UNLOCK(A); \ |
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SOFTIRQ_EXIT(); |
|
|
|
#define E2() \ |
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\ |
|
HARDIRQ_DISABLE(); \ |
|
LOCK(A); \ |
|
HARDIRQ_ENABLE(); \ |
|
UNLOCK(A); |
|
|
|
/* |
|
* Generate 12 testcases: |
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*/ |
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#include "locking-selftest-spin.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin) |
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|
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#include "locking-selftest-wlock.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock) |
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|
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#include "locking-selftest-rlock.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock) |
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|
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#undef E1 |
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#undef E2 |
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|
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/* |
|
* Enabling irqs with an irq-safe lock held: |
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*/ |
|
#define E1() \ |
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\ |
|
IRQ_ENTER(); \ |
|
LOCK(A); \ |
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UNLOCK(A); \ |
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IRQ_EXIT(); |
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|
|
#define E2() \ |
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\ |
|
IRQ_DISABLE(); \ |
|
LOCK(A); \ |
|
IRQ_ENABLE(); \ |
|
UNLOCK(A); |
|
|
|
/* |
|
* Generate 24 testcases: |
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*/ |
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#include "locking-selftest-spin-hardirq.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin) |
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|
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#include "locking-selftest-rlock-hardirq.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock) |
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|
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#include "locking-selftest-wlock-hardirq.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock) |
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|
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#include "locking-selftest-spin-softirq.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin) |
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|
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#include "locking-selftest-rlock-softirq.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock) |
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|
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#include "locking-selftest-wlock-softirq.h" |
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GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock) |
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|
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#undef E1 |
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#undef E2 |
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|
|
/* |
|
* Acquiring a irq-unsafe lock while holding an irq-safe-lock: |
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*/ |
|
#define E1() \ |
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\ |
|
LOCK(A); \ |
|
LOCK(B); \ |
|
UNLOCK(B); \ |
|
UNLOCK(A); \ |
|
|
|
#define E2() \ |
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\ |
|
LOCK(B); \ |
|
UNLOCK(B); |
|
|
|
#define E3() \ |
|
\ |
|
IRQ_ENTER(); \ |
|
LOCK(A); \ |
|
UNLOCK(A); \ |
|
IRQ_EXIT(); |
|
|
|
/* |
|
* Generate 36 testcases: |
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*/ |
|
#include "locking-selftest-spin-hardirq.h" |
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GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin) |
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|
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#include "locking-selftest-rlock-hardirq.h" |
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GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock) |
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|
|
#include "locking-selftest-wlock-hardirq.h" |
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GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock) |
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|
|
#include "locking-selftest-spin-softirq.h" |
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin) |
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|
|
#include "locking-selftest-rlock-softirq.h" |
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock) |
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|
|
#include "locking-selftest-wlock-softirq.h" |
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock) |
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|
|
#undef E1 |
|
#undef E2 |
|
#undef E3 |
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|
|
/* |
|
* 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) |
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|
|
#include "locking-selftest-rlock-hardirq.h" |
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock) |
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|
|
#include "locking-selftest-wlock-hardirq.h" |
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock) |
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|
|
#include "locking-selftest-spin-softirq.h" |
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin) |
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|
|
#include "locking-selftest-rlock-softirq.h" |
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock) |
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|
|
#include "locking-selftest-wlock-softirq.h" |
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock) |
|
|
|
#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) |
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|
|
#include "locking-selftest-spin-softirq.h" |
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin) |
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|
|
#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) |
|
|
|
#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(); \ |
|
RL(A); \ |
|
L(B); \ |
|
U(B); \ |
|
RU(A); \ |
|
IRQ_EXIT(); |
|
|
|
/* |
|
* Generate 12 testcases: |
|
*/ |
|
#include "locking-selftest-hardirq.h" |
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard) |
|
|
|
#include "locking-selftest-softirq.h" |
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft) |
|
|
|
#undef E1 |
|
#undef E2 |
|
#undef E3 |
|
|
|
/* |
|
* read-lock / write-lock recursion that is unsafe. |
|
*/ |
|
|
|
#define E1() \ |
|
\ |
|
IRQ_DISABLE(); \ |
|
L(B); \ |
|
WL(A); \ |
|
WU(A); \ |
|
U(B); \ |
|
IRQ_ENABLE(); |
|
|
|
#define E2() \ |
|
\ |
|
RL(A); \ |
|
RU(A); \ |
|
|
|
#define E3() \ |
|
\ |
|
IRQ_ENTER(); \ |
|
L(B); \ |
|
U(B); \ |
|
IRQ_EXIT(); |
|
|
|
/* |
|
* Generate 12 testcases: |
|
*/ |
|
#include "locking-selftest-hardirq.h" |
|
// GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard) |
|
|
|
#include "locking-selftest-softirq.h" |
|
// GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft) |
|
|
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC |
|
# define I_SPINLOCK(x) lockdep_reset_lock(&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) |
|
#else |
|
# define I_SPINLOCK(x) |
|
# define I_RWLOCK(x) |
|
# define I_MUTEX(x) |
|
# define I_RWSEM(x) |
|
# define I_WW(x) |
|
#endif |
|
|
|
#define I1(x) \ |
|
do { \ |
|
I_SPINLOCK(x); \ |
|
I_RWLOCK(x); \ |
|
I_MUTEX(x); \ |
|
I_RWSEM(x); \ |
|
} while (0) |
|
|
|
#define I2(x) \ |
|
do { \ |
|
raw_spin_lock_init(&lock_##x); \ |
|
rwlock_init(&rwlock_##x); \ |
|
mutex_init(&mutex_##x); \ |
|
init_rwsem(&rwsem_##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); |
|
lockdep_reset(); |
|
I2(A); I2(B); I2(C); I2(D); |
|
init_shared_classes(); |
|
|
|
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) |
|
{ |
|
unsigned long saved_preempt_count = preempt_count(); |
|
|
|
WARN_ON(irqs_disabled()); |
|
|
|
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|"); |
|
|
|
dump_stack(); |
|
} else { |
|
testcase_successes++; |
|
pr_cont(" ok |"); |
|
} |
|
testcase_total++; |
|
|
|
if (debug_locks_verbose) |
|
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_TRACE_IRQFLAGS |
|
if (softirq_count()) |
|
current->softirqs_enabled = 0; |
|
else |
|
current->softirqs_enabled = 1; |
|
#endif |
|
|
|
reset_locks(); |
|
} |
|
|
|
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_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_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); \ |
|
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); \ |
|
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); \ |
|
pr_cont("\n"); |
|
|
|
#define DO_TESTCASE_2I(desc, name, nr) \ |
|
DO_TESTCASE_1("hard-"desc, name##_hard, nr); \ |
|
DO_TESTCASE_1("soft-"desc, name##_soft, nr); |
|
|
|
#define DO_TESTCASE_2IB(desc, name, nr) \ |
|
DO_TESTCASE_1B("hard-"desc, name##_hard, nr); \ |
|
DO_TESTCASE_1B("soft-"desc, name##_soft, nr); |
|
|
|
#define DO_TESTCASE_6I(desc, name, nr) \ |
|
DO_TESTCASE_3("hard-"desc, name##_hard, nr); \ |
|
DO_TESTCASE_3("soft-"desc, name##_soft, nr); |
|
|
|
#define DO_TESTCASE_6IRW(desc, name, nr) \ |
|
DO_TESTCASE_3RW("hard-"desc, name##_hard, nr); \ |
|
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_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 |
|
} |
|
|
|
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; |
|
mutex_lock(&o.base); |
|
mutex_unlock(&o.base); |
|
WARN_ON(o.ctx != (void *)~0UL); |
|
|
|
/* mutex_lock_interruptible (and *_nested) */ |
|
o.ctx = (void *)~0UL; |
|
ret = mutex_lock_interruptible(&o.base); |
|
if (!ret) |
|
mutex_unlock(&o.base); |
|
else |
|
WARN_ON(1); |
|
WARN_ON(o.ctx != (void *)~0UL); |
|
|
|
/* mutex_lock_killable (and *_nested) */ |
|
o.ctx = (void *)~0UL; |
|
ret = mutex_lock_killable(&o.base); |
|
if (!ret) |
|
mutex_unlock(&o.base); |
|
else |
|
WARN_ON(1); |
|
WARN_ON(o.ctx != (void *)~0UL); |
|
|
|
/* trylock, succeeding */ |
|
o.ctx = (void *)~0UL; |
|
ret = mutex_trylock(&o.base); |
|
WARN_ON(!ret); |
|
if (ret) |
|
mutex_unlock(&o.base); |
|
else |
|
WARN_ON(1); |
|
WARN_ON(o.ctx != (void *)~0UL); |
|
|
|
/* trylock, failing */ |
|
o.ctx = (void *)~0UL; |
|
mutex_lock(&o.base); |
|
ret = mutex_trylock(&o.base); |
|
WARN_ON(ret); |
|
mutex_unlock(&o.base); |
|
WARN_ON(o.ctx != (void *)~0UL); |
|
|
|
/* nest_lock */ |
|
o.ctx = (void *)~0UL; |
|
mutex_lock_nest_lock(&o.base, &t); |
|
mutex_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 CONFIG_DEBUG_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; |
|
|
|
mutex_lock(&o2.base); |
|
o2.ctx = &t2; |
|
mutex_release(&o2.base.dep_map, 1, _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_); |
|
mutex_unlock(&o2.base); |
|
WWU(&o); |
|
|
|
WWL(&o2, &t); |
|
} |
|
|
|
static void ww_test_edeadlk_normal_slow(void) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&o2.base); |
|
mutex_release(&o2.base.dep_map, 1, _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_); |
|
mutex_unlock(&o2.base); |
|
WWU(&o); |
|
|
|
ww_mutex_lock_slow(&o2, &t); |
|
} |
|
|
|
static void ww_test_edeadlk_no_unlock(void) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&o2.base); |
|
o2.ctx = &t2; |
|
mutex_release(&o2.base.dep_map, 1, _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_); |
|
mutex_unlock(&o2.base); |
|
|
|
WWL(&o2, &t); |
|
} |
|
|
|
static void ww_test_edeadlk_no_unlock_slow(void) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&o2.base); |
|
mutex_release(&o2.base.dep_map, 1, _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_); |
|
mutex_unlock(&o2.base); |
|
|
|
ww_mutex_lock_slow(&o2, &t); |
|
} |
|
|
|
static void ww_test_edeadlk_acquire_more(void) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&o2.base); |
|
mutex_release(&o2.base.dep_map, 1, _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; |
|
|
|
mutex_lock(&o2.base); |
|
mutex_release(&o2.base.dep_map, 1, _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; |
|
|
|
mutex_lock(&o2.base); |
|
mutex_release(&o2.base.dep_map, 1, _THIS_IP_); |
|
o2.ctx = &t2; |
|
|
|
mutex_lock(&o3.base); |
|
mutex_release(&o3.base.dep_map, 1, _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; |
|
|
|
mutex_lock(&o2.base); |
|
mutex_release(&o2.base.dep_map, 1, _THIS_IP_); |
|
o2.ctx = &t2; |
|
|
|
mutex_lock(&o3.base); |
|
mutex_release(&o3.base.dep_map, 1, _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; |
|
|
|
mutex_lock(&o2.base); |
|
mutex_release(&o2.base.dep_map, 1, _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; |
|
|
|
mutex_lock(&o2.base); |
|
mutex_release(&o2.base.dep_map, 1, _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) |
|
{ |
|
raw_spin_lock_nest_lock(&lock_A, &o.base); |
|
U(A); |
|
} |
|
|
|
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"); |
|
|
|
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"); |
|
} |
|
|
|
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; |
|
} |
|
|
|
/* |
|
* Run the testsuite: |
|
*/ |
|
printk("------------------------\n"); |
|
printk("| Locking API testsuite:\n"); |
|
printk("----------------------------------------------------------------------------\n"); |
|
printk(" | spin |wlock |rlock |mutex | wsem | rsem |\n"); |
|
printk(" --------------------------------------------------------------------------\n"); |
|
|
|
init_shared_classes(); |
|
debug_locks_silent = !debug_locks_verbose; |
|
|
|
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); |
|
DO_TESTCASE_6_SUCCESS("bad unlock order", bad_unlock_order); |
|
|
|
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"); |
|
|
|
printk(" --------------------------------------------------------------------------\n"); |
|
|
|
/* |
|
* irq-context testcases: |
|
*/ |
|
DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1); |
|
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_6x2("irq read-recursion", irq_read_recursion); |
|
// DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2); |
|
|
|
ww_tests(); |
|
|
|
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; |
|
} |
|
debug_locks_silent = 0; |
|
}
|
|
|