1902 lines
40 KiB
C
1902 lines
40 KiB
C
/*
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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/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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* 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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#undef E
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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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* 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"
|
|
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)
|
|
|
|
#undef E
|
|
|
|
/*
|
|
* Bad unlock ordering:
|
|
*/
|
|
#define E() \
|
|
\
|
|
LOCK(A); \
|
|
LOCK(B); \
|
|
UNLOCK(A); /* fail */ \
|
|
UNLOCK(B);
|
|
|
|
/*
|
|
* 6 testcases:
|
|
*/
|
|
#include "locking-selftest-spin.h"
|
|
GENERATE_TESTCASE(bad_unlock_order_spin)
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_TESTCASE(bad_unlock_order_wlock)
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_TESTCASE(bad_unlock_order_rlock)
|
|
#include "locking-selftest-mutex.h"
|
|
GENERATE_TESTCASE(bad_unlock_order_mutex)
|
|
#include "locking-selftest-wsem.h"
|
|
GENERATE_TESTCASE(bad_unlock_order_wsem)
|
|
#include "locking-selftest-rsem.h"
|
|
GENERATE_TESTCASE(bad_unlock_order_rsem)
|
|
|
|
#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)
|
|
|
|
#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)
|
|
|
|
#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)
|
|
|
|
#undef E1
|
|
#undef E2
|
|
|
|
/*
|
|
* 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
|
|
|
|
/*
|
|
* 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)
|
|
|
|
#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)
|
|
|
|
#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)
|
|
|
|
#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)
|
|
|
|
#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)
|
|
|
|
#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)
|
|
|
|
#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)
|
|
|
|
#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)
|
|
|
|
#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++;
|
|
printk("failed|");
|
|
}
|
|
else
|
|
#endif
|
|
if (debug_locks != expected) {
|
|
unexpected_testcase_failures++;
|
|
printk("FAILED|");
|
|
|
|
dump_stack();
|
|
} else {
|
|
testcase_successes++;
|
|
printk(" ok |");
|
|
}
|
|
testcase_total++;
|
|
|
|
if (debug_locks_verbose)
|
|
printk(" 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() = 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); \
|
|
printk("\n");
|
|
|
|
#define DO_TESTCASE_1B(desc, name, nr) \
|
|
print_testname(desc"/"#nr); \
|
|
dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
|
|
printk("\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); \
|
|
printk("\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); \
|
|
printk("\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); \
|
|
printk("\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); \
|
|
printk("\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); \
|
|
printk("\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)
|
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{
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int ret;
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WWAI(&t);
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ret = WWL(&o, &t);
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WARN_ON(ret);
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ret = WWL(&o2, &t);
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WARN_ON(ret);
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WWU(&o2);
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WWU(&o);
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}
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static void ww_test_try_block(void)
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{
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bool ret;
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ret = WWT(&o);
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WARN_ON(!ret);
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WWL1(&o2);
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WWU(&o2);
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WWU(&o);
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}
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static void ww_test_try_try(void)
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{
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bool ret;
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ret = WWT(&o);
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WARN_ON(!ret);
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ret = WWT(&o2);
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WARN_ON(!ret);
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WWU(&o2);
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WWU(&o);
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}
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static void ww_test_try_context(void)
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{
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int ret;
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ret = WWT(&o);
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WARN_ON(!ret);
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WWAI(&t);
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ret = WWL(&o2, &t);
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WARN_ON(ret);
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}
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static void ww_test_block_block(void)
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{
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WWL1(&o);
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WWL1(&o2);
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}
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static void ww_test_block_try(void)
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{
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bool ret;
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WWL1(&o);
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ret = WWT(&o2);
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WARN_ON(!ret);
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}
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static void ww_test_block_context(void)
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{
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int ret;
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WWL1(&o);
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WWAI(&t);
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ret = WWL(&o2, &t);
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WARN_ON(ret);
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}
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static void ww_test_spin_block(void)
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{
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L(A);
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U(A);
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WWL1(&o);
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L(A);
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U(A);
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WWU(&o);
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L(A);
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WWL1(&o);
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WWU(&o);
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U(A);
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}
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static void ww_test_spin_try(void)
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{
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bool ret;
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L(A);
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U(A);
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ret = WWT(&o);
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WARN_ON(!ret);
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L(A);
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U(A);
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WWU(&o);
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L(A);
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ret = WWT(&o);
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WARN_ON(!ret);
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WWU(&o);
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U(A);
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}
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static void ww_test_spin_context(void)
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{
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int ret;
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L(A);
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U(A);
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WWAI(&t);
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ret = WWL(&o, &t);
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WARN_ON(ret);
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L(A);
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U(A);
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WWU(&o);
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L(A);
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ret = WWL(&o, &t);
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WARN_ON(ret);
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WWU(&o);
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U(A);
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}
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static void ww_tests(void)
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{
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printk(" --------------------------------------------------------------------------\n");
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printk(" | Wound/wait tests |\n");
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printk(" ---------------------\n");
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print_testname("ww api failures");
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dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW);
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dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW);
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dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW);
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printk("\n");
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print_testname("ww contexts mixing");
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dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW);
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printk("\n");
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print_testname("finishing ww context");
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dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW);
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printk("\n");
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print_testname("locking mismatches");
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dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW);
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printk("\n");
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print_testname("EDEADLK handling");
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dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW);
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dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW);
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dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW);
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printk("\n");
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print_testname("spinlock nest unlocked");
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dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW);
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printk("\n");
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printk(" -----------------------------------------------------\n");
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printk(" |block | try |context|\n");
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printk(" -----------------------------------------------------\n");
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print_testname("context");
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dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW);
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dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW);
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printk("\n");
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print_testname("try");
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dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW);
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dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW);
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printk("\n");
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print_testname("block");
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dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW);
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dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW);
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printk("\n");
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print_testname("spinlock");
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dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW);
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dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW);
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dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW);
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printk("\n");
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}
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void locking_selftest(void)
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{
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/*
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* Got a locking failure before the selftest ran?
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*/
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if (!debug_locks) {
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printk("----------------------------------\n");
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printk("| Locking API testsuite disabled |\n");
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printk("----------------------------------\n");
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return;
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}
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/*
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* Run the testsuite:
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*/
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printk("------------------------\n");
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printk("| Locking API testsuite:\n");
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printk("----------------------------------------------------------------------------\n");
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printk(" | spin |wlock |rlock |mutex | wsem | rsem |\n");
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printk(" --------------------------------------------------------------------------\n");
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init_shared_classes();
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debug_locks_silent = !debug_locks_verbose;
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DO_TESTCASE_6R("A-A deadlock", AA);
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DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
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DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA);
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DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC);
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DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA);
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DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA);
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DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA);
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DO_TESTCASE_6("double unlock", double_unlock);
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DO_TESTCASE_6("initialize held", init_held);
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DO_TESTCASE_6_SUCCESS("bad unlock order", bad_unlock_order);
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printk(" --------------------------------------------------------------------------\n");
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print_testname("recursive read-lock");
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printk(" |");
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dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
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printk(" |");
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dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
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printk("\n");
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print_testname("recursive read-lock #2");
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printk(" |");
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dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK);
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printk(" |");
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dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
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printk("\n");
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print_testname("mixed read-write-lock");
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printk(" |");
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dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK);
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printk(" |");
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dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM);
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printk("\n");
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print_testname("mixed write-read-lock");
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printk(" |");
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dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK);
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printk(" |");
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dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
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printk("\n");
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printk(" --------------------------------------------------------------------------\n");
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/*
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* irq-context testcases:
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*/
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DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1);
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DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A);
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DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B);
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DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3);
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DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4);
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DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion);
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DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion);
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// DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2);
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ww_tests();
|
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if (unexpected_testcase_failures) {
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printk("-----------------------------------------------------------------\n");
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debug_locks = 0;
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printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
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unexpected_testcase_failures, testcase_total);
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printk("-----------------------------------------------------------------\n");
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} else if (expected_testcase_failures && testcase_successes) {
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printk("--------------------------------------------------------\n");
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printk("%3d out of %3d testcases failed, as expected. |\n",
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expected_testcase_failures, testcase_total);
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printk("----------------------------------------------------\n");
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debug_locks = 1;
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} else if (expected_testcase_failures && !testcase_successes) {
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printk("--------------------------------------------------------\n");
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printk("All %3d testcases failed, as expected. |\n",
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expected_testcase_failures);
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printk("----------------------------------------\n");
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debug_locks = 1;
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} else {
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printk("-------------------------------------------------------\n");
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printk("Good, all %3d testcases passed! |\n",
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testcase_successes);
|
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printk("---------------------------------\n");
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debug_locks = 1;
|
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}
|
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debug_locks_silent = 0;
|
|
}
|