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512bf713cb
linux/lib/locking-selftest.c
Sebastian Andrzej Siewior 512bf713cb lockdep/selftests: Unbalanced migrate_disable() & rcu_read_lock(). 
The tests with unbalanced lock() + unlock() operation leave a modified
preemption counter behind which is then reset to its original value
after the test.

The spin_lock() function on PREEMPT_RT does not include a
preempt_disable() statement but migrate_disable() and read_rcu_lock().
As a consequence both counter never get back to their original value
and the system explodes later after the selftest.  In the
double-unlock case on PREEMPT_RT, the migrate_disable() and RCU code
will trigger a warning which should be avoided. These counter should
not be decremented below their initial value.

Save both counters and bring them back to their original value after
the test.  In the double-unlock case, increment both counter in
advance to they become balanced after the double unlock.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20211129174654.668506-8-bigeasy@linutronix.de
2021-12-04 10:56:24 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* lib/locking-selftest.c
*
* Testsuite for various locking APIs: spinlocks, rwlocks,
* mutexes and rw-semaphores.
*
* It is checking both false positives and false negatives.
*
* Started by Ingo Molnar:
*
* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
*/
#include <linux/rwsem.h>
#include <linux/mutex.h>
#include <linux/ww_mutex.h>
#include <linux/sched.h>
#include <linux/sched/mm.h>
#include <linux/delay.h>
#include <linux/lockdep.h>
#include <linux/spinlock.h>
#include <linux/kallsyms.h>
#include <linux/interrupt.h>
#include <linux/debug_locks.h>
#include <linux/irqflags.h>
#include <linux/rtmutex.h>
#include <linux/local_lock.h>
/*
* Change this to 1 if you want to see the failure printouts:
*/
static unsigned int debug_locks_verbose;
unsigned int force_read_lock_recursive;
static DEFINE_WD_CLASS(ww_lockdep);
static int __init setup_debug_locks_verbose(char *str)
{
get_option(&str, &debug_locks_verbose);
return 1;
}
__setup("debug_locks_verbose=", setup_debug_locks_verbose);
#define FAILURE 0
#define SUCCESS 1
#define LOCKTYPE_SPIN 0x1
#define LOCKTYPE_RWLOCK 0x2
#define LOCKTYPE_MUTEX 0x4
#define LOCKTYPE_RWSEM 0x8
#define LOCKTYPE_WW 0x10
#define LOCKTYPE_RTMUTEX 0x20
#define LOCKTYPE_LL 0x40
#define LOCKTYPE_SPECIAL 0x80
static struct ww_acquire_ctx t, t2;
static struct ww_mutex o, o2, o3;
/*
* Normal standalone locks, for the circular and irq-context
* dependency tests:
*/
static DEFINE_SPINLOCK(lock_A);
static DEFINE_SPINLOCK(lock_B);
static DEFINE_SPINLOCK(lock_C);
static DEFINE_SPINLOCK(lock_D);
static DEFINE_RAW_SPINLOCK(raw_lock_A);
static DEFINE_RAW_SPINLOCK(raw_lock_B);
static DEFINE_RWLOCK(rwlock_A);
static DEFINE_RWLOCK(rwlock_B);
static DEFINE_RWLOCK(rwlock_C);
static DEFINE_RWLOCK(rwlock_D);
static DEFINE_MUTEX(mutex_A);
static DEFINE_MUTEX(mutex_B);
static DEFINE_MUTEX(mutex_C);
static DEFINE_MUTEX(mutex_D);
static DECLARE_RWSEM(rwsem_A);
static DECLARE_RWSEM(rwsem_B);
static DECLARE_RWSEM(rwsem_C);
static DECLARE_RWSEM(rwsem_D);
#ifdef CONFIG_RT_MUTEXES
static DEFINE_RT_MUTEX(rtmutex_A);
static DEFINE_RT_MUTEX(rtmutex_B);
static DEFINE_RT_MUTEX(rtmutex_C);
static DEFINE_RT_MUTEX(rtmutex_D);
#endif
/*
* Locks that we initialize dynamically as well so that
* e.g. X1 and X2 becomes two instances of the same class,
* but X* and Y* are different classes. We do this so that
* we do not trigger a real lockup:
*/
static DEFINE_SPINLOCK(lock_X1);
static DEFINE_SPINLOCK(lock_X2);
static DEFINE_SPINLOCK(lock_Y1);
static DEFINE_SPINLOCK(lock_Y2);
static DEFINE_SPINLOCK(lock_Z1);
static DEFINE_SPINLOCK(lock_Z2);
static DEFINE_RWLOCK(rwlock_X1);
static DEFINE_RWLOCK(rwlock_X2);
static DEFINE_RWLOCK(rwlock_Y1);
static DEFINE_RWLOCK(rwlock_Y2);
static DEFINE_RWLOCK(rwlock_Z1);
static DEFINE_RWLOCK(rwlock_Z2);
static DEFINE_MUTEX(mutex_X1);
static DEFINE_MUTEX(mutex_X2);
static DEFINE_MUTEX(mutex_Y1);
static DEFINE_MUTEX(mutex_Y2);
static DEFINE_MUTEX(mutex_Z1);
static DEFINE_MUTEX(mutex_Z2);
static DECLARE_RWSEM(rwsem_X1);
static DECLARE_RWSEM(rwsem_X2);
static DECLARE_RWSEM(rwsem_Y1);
static DECLARE_RWSEM(rwsem_Y2);
static DECLARE_RWSEM(rwsem_Z1);
static DECLARE_RWSEM(rwsem_Z2);
#ifdef CONFIG_RT_MUTEXES
static DEFINE_RT_MUTEX(rtmutex_X1);
static DEFINE_RT_MUTEX(rtmutex_X2);
static DEFINE_RT_MUTEX(rtmutex_Y1);
static DEFINE_RT_MUTEX(rtmutex_Y2);
static DEFINE_RT_MUTEX(rtmutex_Z1);
static DEFINE_RT_MUTEX(rtmutex_Z2);
#endif
static DEFINE_PER_CPU(local_lock_t, local_A);
/*
* non-inlined runtime initializers, to let separate locks share
* the same lock-class:
*/
#define INIT_CLASS_FUNC(class) \
static noinline void \
init_class_##class(spinlock_t *lock, rwlock_t *rwlock, \
struct mutex *mutex, struct rw_semaphore *rwsem)\
{ \
spin_lock_init(lock); \
rwlock_init(rwlock); \
mutex_init(mutex); \
init_rwsem(rwsem); \
}
INIT_CLASS_FUNC(X)
INIT_CLASS_FUNC(Y)
INIT_CLASS_FUNC(Z)
static void init_shared_classes(void)
{
#ifdef CONFIG_RT_MUTEXES
static struct lock_class_key rt_X, rt_Y, rt_Z;
__rt_mutex_init(&rtmutex_X1, __func__, &rt_X);
__rt_mutex_init(&rtmutex_X2, __func__, &rt_X);
__rt_mutex_init(&rtmutex_Y1, __func__, &rt_Y);
__rt_mutex_init(&rtmutex_Y2, __func__, &rt_Y);
__rt_mutex_init(&rtmutex_Z1, __func__, &rt_Z);
__rt_mutex_init(&rtmutex_Z2, __func__, &rt_Z);
#endif
init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1);
init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2);
init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1);
init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2);
init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1);
init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2);
}
/*
* For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests.
* The following functions use a lock from a simulated hardirq/softirq
* context, causing the locks to be marked as hardirq-safe/softirq-safe:
*/
#define HARDIRQ_DISABLE local_irq_disable
#define HARDIRQ_ENABLE local_irq_enable
#define HARDIRQ_ENTER() \
local_irq_disable(); \
__irq_enter(); \
lockdep_hardirq_threaded(); \
WARN_ON(!in_irq());
#define HARDIRQ_EXIT() \
__irq_exit(); \
local_irq_enable();
#define SOFTIRQ_DISABLE local_bh_disable
#define SOFTIRQ_ENABLE local_bh_enable
#define SOFTIRQ_ENTER() \
local_bh_disable(); \
local_irq_disable(); \
lockdep_softirq_enter(); \
WARN_ON(!in_softirq());
#define SOFTIRQ_EXIT() \
lockdep_softirq_exit(); \
local_irq_enable(); \
local_bh_enable();
/*
* Shortcuts for lock/unlock API variants, to keep
* the testcases compact:
*/
#define L(x) spin_lock(&lock_##x)
#define U(x) spin_unlock(&lock_##x)
#define LU(x) L(x); U(x)
#define SI(x) spin_lock_init(&lock_##x)
#define WL(x) write_lock(&rwlock_##x)
#define WU(x) write_unlock(&rwlock_##x)
#define WLU(x) WL(x); WU(x)
#define RL(x) read_lock(&rwlock_##x)
#define RU(x) read_unlock(&rwlock_##x)
#define RLU(x) RL(x); RU(x)
#define RWI(x) rwlock_init(&rwlock_##x)
#define ML(x) mutex_lock(&mutex_##x)
#define MU(x) mutex_unlock(&mutex_##x)
#define MI(x) mutex_init(&mutex_##x)
#define RTL(x) rt_mutex_lock(&rtmutex_##x)
#define RTU(x) rt_mutex_unlock(&rtmutex_##x)
#define RTI(x) rt_mutex_init(&rtmutex_##x)
#define WSL(x) down_write(&rwsem_##x)
#define WSU(x) up_write(&rwsem_##x)
#define RSL(x) down_read(&rwsem_##x)
#define RSU(x) up_read(&rwsem_##x)
#define RWSI(x) init_rwsem(&rwsem_##x)
#ifndef CONFIG_DEBUG_WW_MUTEX_SLOWPATH
#define WWAI(x) ww_acquire_init(x, &ww_lockdep)
#else
#define WWAI(x) do { ww_acquire_init(x, &ww_lockdep); (x)->deadlock_inject_countdown = ~0U; } while (0)
#endif
#define WWAD(x) ww_acquire_done(x)
#define WWAF(x) ww_acquire_fini(x)
#define WWL(x, c) ww_mutex_lock(x, c)
#define WWT(x) ww_mutex_trylock(x, NULL)
#define WWL1(x) ww_mutex_lock(x, NULL)
#define WWU(x) ww_mutex_unlock(x)
#define LOCK_UNLOCK_2(x,y) LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x)
/*
* Generate different permutations of the same testcase, using
* the same basic lock-dependency/state events:
*/
#define GENERATE_TESTCASE(name) \
\
static void name(void) { E(); }
#define GENERATE_PERMUTATIONS_2_EVENTS(name) \
\
static void name##_12(void) { E1(); E2(); } \
static void name##_21(void) { E2(); E1(); }
#define GENERATE_PERMUTATIONS_3_EVENTS(name) \
\
static void name##_123(void) { E1(); E2(); E3(); } \
static void name##_132(void) { E1(); E3(); E2(); } \
static void name##_213(void) { E2(); E1(); E3(); } \
static void name##_231(void) { E2(); E3(); E1(); } \
static void name##_312(void) { E3(); E1(); E2(); } \
static void name##_321(void) { E3(); E2(); E1(); }
/*
* AA deadlock:
*/
#define E() \
\
LOCK(X1); \
LOCK(X2); /* this one should fail */
/*
* 6 testcases:
*/
#include "locking-selftest-spin.h"
GENERATE_TESTCASE(AA_spin)
#include "locking-selftest-wlock.h"
GENERATE_TESTCASE(AA_wlock)
#include "locking-selftest-rlock.h"
GENERATE_TESTCASE(AA_rlock)
#include "locking-selftest-mutex.h"
GENERATE_TESTCASE(AA_mutex)
#include "locking-selftest-wsem.h"
GENERATE_TESTCASE(AA_wsem)
#include "locking-selftest-rsem.h"
GENERATE_TESTCASE(AA_rsem)
#ifdef CONFIG_RT_MUTEXES
#include "locking-selftest-rtmutex.h"
GENERATE_TESTCASE(AA_rtmutex);
#endif
#undef E
/*
* Special-case for read-locking, they are
* allowed to recurse on the same lock class:
*/
static void rlock_AA1(void)
{
RL(X1);
RL(X1); // this one should NOT fail
}
static void rlock_AA1B(void)
{
RL(X1);
RL(X2); // this one should NOT fail
}
static void rsem_AA1(void)
{
RSL(X1);
RSL(X1); // this one should fail
}
static void rsem_AA1B(void)
{
RSL(X1);
RSL(X2); // this one should fail
}
/*
* The mixing of read and write locks is not allowed:
*/
static void rlock_AA2(void)
{
RL(X1);
WL(X2); // this one should fail
}
static void rsem_AA2(void)
{
RSL(X1);
WSL(X2); // this one should fail
}
static void rlock_AA3(void)
{
WL(X1);
RL(X2); // this one should fail
}
static void rsem_AA3(void)
{
WSL(X1);
RSL(X2); // this one should fail
}
/*
* read_lock(A)
* spin_lock(B)
* spin_lock(B)
* write_lock(A)
*/
static void rlock_ABBA1(void)
{
RL(X1);
L(Y1);
U(Y1);
RU(X1);
L(Y1);
WL(X1);
WU(X1);
U(Y1); // should fail
}
static void rwsem_ABBA1(void)
{
RSL(X1);
ML(Y1);
MU(Y1);
RSU(X1);
ML(Y1);
WSL(X1);
WSU(X1);
MU(Y1); // should fail
}
/*
* read_lock(A)
* spin_lock(B)
* spin_lock(B)
* write_lock(A)
*
* This test case is aimed at poking whether the chain cache prevents us from
* detecting a read-lock/lock-write deadlock: if the chain cache doesn't differ
* read/write locks, the following case may happen
*
* { read_lock(A)->lock(B) dependency exists }
*
* P0:
* lock(B);
* read_lock(A);
*
* { Not a deadlock, B -> A is added in the chain cache }
*
* P1:
* lock(B);
* write_lock(A);
*
* { B->A found in chain cache, not reported as a deadlock }
*
*/
static void rlock_chaincache_ABBA1(void)
{
RL(X1);
L(Y1);
U(Y1);
RU(X1);
L(Y1);
RL(X1);
RU(X1);
U(Y1);
L(Y1);
WL(X1);
WU(X1);
U(Y1); // should fail
}
/*
* read_lock(A)
* spin_lock(B)
* spin_lock(B)
* read_lock(A)
*/
static void rlock_ABBA2(void)
{
RL(X1);
L(Y1);
U(Y1);
RU(X1);
L(Y1);
RL(X1);
RU(X1);
U(Y1); // should NOT fail
}
static void rwsem_ABBA2(void)
{
RSL(X1);
ML(Y1);
MU(Y1);
RSU(X1);
ML(Y1);
RSL(X1);
RSU(X1);
MU(Y1); // should fail
}
/*
* write_lock(A)
* spin_lock(B)
* spin_lock(B)
* write_lock(A)
*/
static void rlock_ABBA3(void)
{
WL(X1);
L(Y1);
U(Y1);
WU(X1);
L(Y1);
WL(X1);
WU(X1);
U(Y1); // should fail
}
static void rwsem_ABBA3(void)
{
WSL(X1);
ML(Y1);
MU(Y1);
WSU(X1);
ML(Y1);
WSL(X1);
WSU(X1);
MU(Y1); // should fail
}
/*
* ABBA deadlock:
*/
#define E() \
\
LOCK_UNLOCK_2(A, B); \
LOCK_UNLOCK_2(B, A); /* fail */
/*
* 6 testcases:
*/
#include "locking-selftest-spin.h"
GENERATE_TESTCASE(ABBA_spin)
#include "locking-selftest-wlock.h"
GENERATE_TESTCASE(ABBA_wlock)
#include "locking-selftest-rlock.h"
GENERATE_TESTCASE(ABBA_rlock)
#include "locking-selftest-mutex.h"
GENERATE_TESTCASE(ABBA_mutex)
#include "locking-selftest-wsem.h"
GENERATE_TESTCASE(ABBA_wsem)
#include "locking-selftest-rsem.h"
GENERATE_TESTCASE(ABBA_rsem)
#ifdef CONFIG_RT_MUTEXES
#include "locking-selftest-rtmutex.h"
GENERATE_TESTCASE(ABBA_rtmutex);
#endif
#undef E
/*
* AB BC CA deadlock:
*/
#define E() \
\
LOCK_UNLOCK_2(A, B); \
LOCK_UNLOCK_2(B, C); \
LOCK_UNLOCK_2(C, A); /* fail */
/*
* 6 testcases:
*/
#include "locking-selftest-spin.h"
GENERATE_TESTCASE(ABBCCA_spin)
#include "locking-selftest-wlock.h"
GENERATE_TESTCASE(ABBCCA_wlock)
#include "locking-selftest-rlock.h"
GENERATE_TESTCASE(ABBCCA_rlock)
#include "locking-selftest-mutex.h"
GENERATE_TESTCASE(ABBCCA_mutex)
#include "locking-selftest-wsem.h"
GENERATE_TESTCASE(ABBCCA_wsem)
#include "locking-selftest-rsem.h"
GENERATE_TESTCASE(ABBCCA_rsem)
#ifdef CONFIG_RT_MUTEXES
#include "locking-selftest-rtmutex.h"
GENERATE_TESTCASE(ABBCCA_rtmutex);
#endif
#undef E
/*
* AB CA BC deadlock:
*/
#define E() \
\
LOCK_UNLOCK_2(A, B); \
LOCK_UNLOCK_2(C, A); \
LOCK_UNLOCK_2(B, C); /* fail */
/*
* 6 testcases:
*/
#include "locking-selftest-spin.h"
GENERATE_TESTCASE(ABCABC_spin)
#include "locking-selftest-wlock.h"
GENERATE_TESTCASE(ABCABC_wlock)
#include "locking-selftest-rlock.h"
GENERATE_TESTCASE(ABCABC_rlock)
#include "locking-selftest-mutex.h"
GENERATE_TESTCASE(ABCABC_mutex)
#include "locking-selftest-wsem.h"
GENERATE_TESTCASE(ABCABC_wsem)
#include "locking-selftest-rsem.h"
GENERATE_TESTCASE(ABCABC_rsem)
#ifdef CONFIG_RT_MUTEXES
#include "locking-selftest-rtmutex.h"
GENERATE_TESTCASE(ABCABC_rtmutex);
#endif
#undef E
/*
* AB BC CD DA deadlock:
*/
#define E() \
\
LOCK_UNLOCK_2(A, B); \
LOCK_UNLOCK_2(B, C); \
LOCK_UNLOCK_2(C, D); \
LOCK_UNLOCK_2(D, A); /* fail */
/*
* 6 testcases:
*/
#include "locking-selftest-spin.h"
GENERATE_TESTCASE(ABBCCDDA_spin)
#include "locking-selftest-wlock.h"
GENERATE_TESTCASE(ABBCCDDA_wlock)
#include "locking-selftest-rlock.h"
GENERATE_TESTCASE(ABBCCDDA_rlock)
#include "locking-selftest-mutex.h"
GENERATE_TESTCASE(ABBCCDDA_mutex)
#include "locking-selftest-wsem.h"
GENERATE_TESTCASE(ABBCCDDA_wsem)
#include "locking-selftest-rsem.h"
GENERATE_TESTCASE(ABBCCDDA_rsem)
#ifdef CONFIG_RT_MUTEXES
#include "locking-selftest-rtmutex.h"
GENERATE_TESTCASE(ABBCCDDA_rtmutex);
#endif
#undef E
/*
* AB CD BD DA deadlock:
*/
#define E() \
\
LOCK_UNLOCK_2(A, B); \
LOCK_UNLOCK_2(C, D); \
LOCK_UNLOCK_2(B, D); \
LOCK_UNLOCK_2(D, A); /* fail */
/*
* 6 testcases:
*/
#include "locking-selftest-spin.h"
GENERATE_TESTCASE(ABCDBDDA_spin)
#include "locking-selftest-wlock.h"
GENERATE_TESTCASE(ABCDBDDA_wlock)
#include "locking-selftest-rlock.h"
GENERATE_TESTCASE(ABCDBDDA_rlock)
#include "locking-selftest-mutex.h"
GENERATE_TESTCASE(ABCDBDDA_mutex)
#include "locking-selftest-wsem.h"
GENERATE_TESTCASE(ABCDBDDA_wsem)
#include "locking-selftest-rsem.h"
GENERATE_TESTCASE(ABCDBDDA_rsem)
#ifdef CONFIG_RT_MUTEXES
#include "locking-selftest-rtmutex.h"
GENERATE_TESTCASE(ABCDBDDA_rtmutex);
#endif
#undef E
/*
* AB CD BC DA deadlock:
*/
#define E() \
\
LOCK_UNLOCK_2(A, B); \
LOCK_UNLOCK_2(C, D); \
LOCK_UNLOCK_2(B, C); \
LOCK_UNLOCK_2(D, A); /* fail */
/*
* 6 testcases:
*/
#include "locking-selftest-spin.h"
GENERATE_TESTCASE(ABCDBCDA_spin)
#include "locking-selftest-wlock.h"
GENERATE_TESTCASE(ABCDBCDA_wlock)
#include "locking-selftest-rlock.h"
GENERATE_TESTCASE(ABCDBCDA_rlock)
#include "locking-selftest-mutex.h"
GENERATE_TESTCASE(ABCDBCDA_mutex)
#include "locking-selftest-wsem.h"
GENERATE_TESTCASE(ABCDBCDA_wsem)
#include "locking-selftest-rsem.h"
GENERATE_TESTCASE(ABCDBCDA_rsem)
#ifdef CONFIG_RT_MUTEXES
#include "locking-selftest-rtmutex.h"
GENERATE_TESTCASE(ABCDBCDA_rtmutex);
#endif
#undef E
#ifdef CONFIG_PREEMPT_RT
# define RT_PREPARE_DBL_UNLOCK() { migrate_disable(); rcu_read_lock(); }
#else
# define RT_PREPARE_DBL_UNLOCK()
#endif
/*
* Double unlock:
*/
#define E() \
\
LOCK(A); \
RT_PREPARE_DBL_UNLOCK(); \
UNLOCK(A); \
UNLOCK(A); /* fail */
/*
* 6 testcases:
*/
#include "locking-selftest-spin.h"
GENERATE_TESTCASE(double_unlock_spin)
#include "locking-selftest-wlock.h"
GENERATE_TESTCASE(double_unlock_wlock)
#include "locking-selftest-rlock.h"
GENERATE_TESTCASE(double_unlock_rlock)
#include "locking-selftest-mutex.h"
GENERATE_TESTCASE(double_unlock_mutex)
#include "locking-selftest-wsem.h"
GENERATE_TESTCASE(double_unlock_wsem)
#include "locking-selftest-rsem.h"
GENERATE_TESTCASE(double_unlock_rsem)
#ifdef CONFIG_RT_MUTEXES
#include "locking-selftest-rtmutex.h"
GENERATE_TESTCASE(double_unlock_rtmutex);
#endif
#undef E
/*
* initializing a held lock:
*/
#define E() \
\
LOCK(A); \
INIT(A); /* fail */
/*
* 6 testcases:
*/
#include "locking-selftest-spin.h"
GENERATE_TESTCASE(init_held_spin)
#include "locking-selftest-wlock.h"
GENERATE_TESTCASE(init_held_wlock)
#include "locking-selftest-rlock.h"
GENERATE_TESTCASE(init_held_rlock)
#include "locking-selftest-mutex.h"
GENERATE_TESTCASE(init_held_mutex)
#include "locking-selftest-wsem.h"
GENERATE_TESTCASE(init_held_wsem)
#include "locking-selftest-rsem.h"
GENERATE_TESTCASE(init_held_rsem)
#ifdef CONFIG_RT_MUTEXES
#include "locking-selftest-rtmutex.h"
GENERATE_TESTCASE(init_held_rtmutex);
#endif
#undef E
/*
* locking an irq-safe lock with irqs enabled:
*/
#define E1() \
\
IRQ_ENTER(); \
LOCK(A); \
UNLOCK(A); \
IRQ_EXIT();
#define E2() \
\
LOCK(A); \
UNLOCK(A);
/*
* Generate 24 testcases:
*/
#include "locking-selftest-spin-hardirq.h"
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin)
#include "locking-selftest-rlock-hardirq.h"
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock)
#include "locking-selftest-wlock-hardirq.h"
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock)
#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
/*
* write-read / write-read / write-read deadlock even if read is recursive
*/
#define E1() \
\
WL(X1); \
RL(Y1); \
RU(Y1); \
WU(X1);
#define E2() \
\
WL(Y1); \
RL(Z1); \
RU(Z1); \
WU(Y1);
#define E3() \
\
WL(Z1); \
RL(X1); \
RU(X1); \
WU(Z1);
#include "locking-selftest-rlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(W1R2_W2R3_W3R1)
#undef E1
#undef E2
#undef E3
/*
* write-write / read-read / write-read deadlock even if read is recursive
*/
#define E1() \
\
WL(X1); \
WL(Y1); \
WU(Y1); \
WU(X1);
#define E2() \
\
RL(Y1); \
RL(Z1); \
RU(Z1); \
RU(Y1);
#define E3() \
\
WL(Z1); \
RL(X1); \
RU(X1); \
WU(Z1);
#include "locking-selftest-rlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_W3R1)
#undef E1
#undef E2
#undef E3
/*
* write-write / read-read / read-write is not deadlock when read is recursive
*/
#define E1() \
\
WL(X1); \
WL(Y1); \
WU(Y1); \
WU(X1);
#define E2() \
\
RL(Y1); \
RL(Z1); \
RU(Z1); \
RU(Y1);
#define E3() \
\
RL(Z1); \
WL(X1); \
WU(X1); \
RU(Z1);
#include "locking-selftest-rlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(W1R2_R2R3_W3W1)
#undef E1
#undef E2
#undef E3
/*
* write-read / read-read / write-write is not deadlock when read is recursive
*/
#define E1() \
\
WL(X1); \
RL(Y1); \
RU(Y1); \
WU(X1);
#define E2() \
\
RL(Y1); \
RL(Z1); \
RU(Z1); \
RU(Y1);
#define E3() \
\
WL(Z1); \
WL(X1); \
WU(X1); \
WU(Z1);
#include "locking-selftest-rlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_R3W1)
#undef E1
#undef E2
#undef E3
/*
* read-lock / write-lock recursion that is actually safe.
*/
#define E1() \
\
IRQ_DISABLE(); \
WL(A); \
WU(A); \
IRQ_ENABLE();
#define E2() \
\
RL(A); \
RU(A); \
#define E3() \
\
IRQ_ENTER(); \
LOCK(A); \
L(B); \
U(B); \
UNLOCK(A); \
IRQ_EXIT();
/*
* Generate 24 testcases:
*/
#include "locking-selftest-hardirq.h"
#include "locking-selftest-rlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_rlock)
#include "locking-selftest-wlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_wlock)
#include "locking-selftest-softirq.h"
#include "locking-selftest-rlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_rlock)
#include "locking-selftest-wlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_wlock)
#undef E1
#undef E2
#undef E3
/*
* read-lock / write-lock recursion that is unsafe.
*/
#define E1() \
\
IRQ_DISABLE(); \
L(B); \
LOCK(A); \
UNLOCK(A); \
U(B); \
IRQ_ENABLE();
#define E2() \
\
RL(A); \
RU(A); \
#define E3() \
\
IRQ_ENTER(); \
L(B); \
U(B); \
IRQ_EXIT();
/*
* Generate 24 testcases:
*/
#include "locking-selftest-hardirq.h"
#include "locking-selftest-rlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_rlock)
#include "locking-selftest-wlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_wlock)
#include "locking-selftest-softirq.h"
#include "locking-selftest-rlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_rlock)
#include "locking-selftest-wlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_wlock)
#undef E1
#undef E2
#undef E3
/*
* read-lock / write-lock recursion that is unsafe.
*
* A is a ENABLED_*_READ lock
* B is a USED_IN_*_READ lock
*
* read_lock(A);
* write_lock(B);
* <interrupt>
* read_lock(B);
* write_lock(A); // if this one is read_lock(), no deadlock
*/
#define E1() \
\
IRQ_DISABLE(); \
WL(B); \
LOCK(A); \
UNLOCK(A); \
WU(B); \
IRQ_ENABLE();
#define E2() \
\
RL(A); \
RU(A); \
#define E3() \
\
IRQ_ENTER(); \
RL(B); \
RU(B); \
IRQ_EXIT();
/*
* Generate 24 testcases:
*/
#include "locking-selftest-hardirq.h"
#include "locking-selftest-rlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_rlock)
#include "locking-selftest-wlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_wlock)
#include "locking-selftest-softirq.h"
#include "locking-selftest-rlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_rlock)
#include "locking-selftest-wlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_wlock)
#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map)
# define I_RAW_SPINLOCK(x) lockdep_reset_lock(&raw_lock_##x.dep_map)
# define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map)
# define I_MUTEX(x) lockdep_reset_lock(&mutex_##x.dep_map)
# define I_RWSEM(x) lockdep_reset_lock(&rwsem_##x.dep_map)
# define I_WW(x) lockdep_reset_lock(&x.dep_map)
# define I_LOCAL_LOCK(x) lockdep_reset_lock(this_cpu_ptr(&local_##x.dep_map))
#ifdef CONFIG_RT_MUTEXES
# define I_RTMUTEX(x) lockdep_reset_lock(&rtmutex_##x.dep_map)
#endif
#else
# define I_SPINLOCK(x)
# define I_RAW_SPINLOCK(x)
# define I_RWLOCK(x)
# define I_MUTEX(x)
# define I_RWSEM(x)
# define I_WW(x)
# define I_LOCAL_LOCK(x)
#endif
#ifndef I_RTMUTEX
# define I_RTMUTEX(x)
#endif
#ifdef CONFIG_RT_MUTEXES
#define I2_RTMUTEX(x) rt_mutex_init(&rtmutex_##x)
#else
#define I2_RTMUTEX(x)
#endif
#define I1(x) \
do { \
I_SPINLOCK(x); \
I_RWLOCK(x); \
I_MUTEX(x); \
I_RWSEM(x); \
I_RTMUTEX(x); \
} while (0)
#define I2(x) \
do { \
spin_lock_init(&lock_##x); \
rwlock_init(&rwlock_##x); \
mutex_init(&mutex_##x); \
init_rwsem(&rwsem_##x); \
I2_RTMUTEX(x); \
} while (0)
static void reset_locks(void)
{
local_irq_disable();
lockdep_free_key_range(&ww_lockdep.acquire_key, 1);
lockdep_free_key_range(&ww_lockdep.mutex_key, 1);
I1(A); I1(B); I1(C); I1(D);
I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2);
I_WW(t); I_WW(t2); I_WW(o.base); I_WW(o2.base); I_WW(o3.base);
I_RAW_SPINLOCK(A); I_RAW_SPINLOCK(B);
I_LOCAL_LOCK(A);
lockdep_reset();
I2(A); I2(B); I2(C); I2(D);
init_shared_classes();
raw_spin_lock_init(&raw_lock_A);
raw_spin_lock_init(&raw_lock_B);
local_lock_init(this_cpu_ptr(&local_A));
ww_mutex_init(&o, &ww_lockdep); ww_mutex_init(&o2, &ww_lockdep); ww_mutex_init(&o3, &ww_lockdep);
memset(&t, 0, sizeof(t)); memset(&t2, 0, sizeof(t2));
memset(&ww_lockdep.acquire_key, 0, sizeof(ww_lockdep.acquire_key));
memset(&ww_lockdep.mutex_key, 0, sizeof(ww_lockdep.mutex_key));
local_irq_enable();
}
#undef I
static int testcase_total;
static int testcase_successes;
static int expected_testcase_failures;
static int unexpected_testcase_failures;
static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
{
int saved_preempt_count = preempt_count();
#ifdef CONFIG_PREEMPT_RT
#ifdef CONFIG_SMP
int saved_mgd_count = current->migration_disabled;
#endif
int saved_rcu_count = current->rcu_read_lock_nesting;
#endif
WARN_ON(irqs_disabled());
debug_locks_silent = !(debug_locks_verbose & lockclass_mask);
testcase_fn();
/*
* Filter out expected failures:
*/
#ifndef CONFIG_PROVE_LOCKING
if (expected == FAILURE && debug_locks) {
expected_testcase_failures++;
pr_cont("failed|");
}
else
#endif
if (debug_locks != expected) {
unexpected_testcase_failures++;
pr_cont("FAILED|");
} else {
testcase_successes++;
pr_cont(" ok |");
}
testcase_total++;
if (debug_locks_verbose & lockclass_mask)
pr_cont(" lockclass mask: %x, debug_locks: %d, expected: %d\n",
lockclass_mask, debug_locks, expected);
/*
* Some tests (e.g. double-unlock) might corrupt the preemption
* count, so restore it:
*/
preempt_count_set(saved_preempt_count);
#ifdef CONFIG_PREEMPT_RT
#ifdef CONFIG_SMP
while (current->migration_disabled > saved_mgd_count)
migrate_enable();
#endif
while (current->rcu_read_lock_nesting > saved_rcu_count)
rcu_read_unlock();
WARN_ON_ONCE(current->rcu_read_lock_nesting < saved_rcu_count);
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
if (softirq_count())
current->softirqs_enabled = 0;
else
current->softirqs_enabled = 1;
#endif
reset_locks();
}
#ifdef CONFIG_RT_MUTEXES
#define dotest_rt(fn, e, m) dotest((fn), (e), (m))
#else
#define dotest_rt(fn, e, m)
#endif
static inline void print_testname(const char *testname)
{
printk("%33s:", testname);
}
#define DO_TESTCASE_1(desc, name, nr) \
print_testname(desc"/"#nr); \
dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
pr_cont("\n");
#define DO_TESTCASE_1B(desc, name, nr) \
print_testname(desc"/"#nr); \
dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
pr_cont("\n");
#define DO_TESTCASE_1RR(desc, name, nr) \
print_testname(desc"/"#nr); \
pr_cont(" |"); \
dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
pr_cont("\n");
#define DO_TESTCASE_1RRB(desc, name, nr) \
print_testname(desc"/"#nr); \
pr_cont(" |"); \
dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
pr_cont("\n");
#define DO_TESTCASE_3(desc, name, nr) \
print_testname(desc"/"#nr); \
dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \
dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
pr_cont("\n");
#define DO_TESTCASE_3RW(desc, name, nr) \
print_testname(desc"/"#nr); \
dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\
dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
pr_cont("\n");
#define DO_TESTCASE_2RW(desc, name, nr) \
print_testname(desc"/"#nr); \
pr_cont(" |"); \
dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
pr_cont("\n");
#define DO_TESTCASE_2x2RW(desc, name, nr) \
DO_TESTCASE_2RW("hard-"desc, name##_hard, nr) \
DO_TESTCASE_2RW("soft-"desc, name##_soft, nr) \
#define DO_TESTCASE_6x2x2RW(desc, name) \
DO_TESTCASE_2x2RW(desc, name, 123); \
DO_TESTCASE_2x2RW(desc, name, 132); \
DO_TESTCASE_2x2RW(desc, name, 213); \
DO_TESTCASE_2x2RW(desc, name, 231); \
DO_TESTCASE_2x2RW(desc, name, 312); \
DO_TESTCASE_2x2RW(desc, name, 321);
#define DO_TESTCASE_6(desc, name) \
print_testname(desc); \
dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \
dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \
dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK); \
dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \
dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \
dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \
dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \
pr_cont("\n");
#define DO_TESTCASE_6_SUCCESS(desc, name) \
print_testname(desc); \
dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN); \
dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK); \
dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \
dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX); \
dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM); \
dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM); \
dotest_rt(name##_rtmutex, SUCCESS, LOCKTYPE_RTMUTEX); \
pr_cont("\n");
/*
* 'read' variant: rlocks must not trigger.
*/
#define DO_TESTCASE_6R(desc, name) \
print_testname(desc); \
dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \
dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \
dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \
dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \
dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \
dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \
dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \
pr_cont("\n");
#define DO_TESTCASE_2I(desc, name, nr) \
DO_TESTCASE_1("hard-"desc, name##_hard, nr); \
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_6x1RR(desc, name) \
DO_TESTCASE_1RR(desc, name, 123); \
DO_TESTCASE_1RR(desc, name, 132); \
DO_TESTCASE_1RR(desc, name, 213); \
DO_TESTCASE_1RR(desc, name, 231); \
DO_TESTCASE_1RR(desc, name, 312); \
DO_TESTCASE_1RR(desc, name, 321);
#define DO_TESTCASE_6x1RRB(desc, name) \
DO_TESTCASE_1RRB(desc, name, 123); \
DO_TESTCASE_1RRB(desc, name, 132); \
DO_TESTCASE_1RRB(desc, name, 213); \
DO_TESTCASE_1RRB(desc, name, 231); \
DO_TESTCASE_1RRB(desc, name, 312); \
DO_TESTCASE_1RRB(desc, name, 321);
#define DO_TESTCASE_6x6(desc, name) \
DO_TESTCASE_6I(desc, name, 123); \
DO_TESTCASE_6I(desc, name, 132); \
DO_TESTCASE_6I(desc, name, 213); \
DO_TESTCASE_6I(desc, name, 231); \
DO_TESTCASE_6I(desc, name, 312); \
DO_TESTCASE_6I(desc, name, 321);
#define DO_TESTCASE_6x6RW(desc, name) \
DO_TESTCASE_6IRW(desc, name, 123); \
DO_TESTCASE_6IRW(desc, name, 132); \
DO_TESTCASE_6IRW(desc, name, 213); \
DO_TESTCASE_6IRW(desc, name, 231); \
DO_TESTCASE_6IRW(desc, name, 312); \
DO_TESTCASE_6IRW(desc, name, 321);
static void ww_test_fail_acquire(void)
{
int ret;
WWAI(&t);
t.stamp++;
ret = WWL(&o, &t);
if (WARN_ON(!o.ctx) ||
WARN_ON(ret))
return;
/* No lockdep test, pure API */
ret = WWL(&o, &t);
WARN_ON(ret != -EALREADY);
ret = WWT(&o);
WARN_ON(ret);
t2 = t;
t2.stamp++;
ret = WWL(&o, &t2);
WARN_ON(ret != -EDEADLK);
WWU(&o);
if (WWT(&o))
WWU(&o);
#ifdef CONFIG_DEBUG_LOCK_ALLOC
else
DEBUG_LOCKS_WARN_ON(1);
#endif
}
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, _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, _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, _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, _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, _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, _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, _THIS_IP_);
o2.ctx = &t2;
mutex_lock(&o3.base);
mutex_release(&o3.base.dep_map, _THIS_IP_);
o3.ctx = &t2;
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
ret = WWL(&o3, &t);
WARN_ON(ret != -EDEADLK);
}
static void ww_test_edeadlk_acquire_more_edeadlk_slow(void)
{
int ret;
mutex_lock(&o2.base);
mutex_release(&o2.base.dep_map, _THIS_IP_);
o2.ctx = &t2;
mutex_lock(&o3.base);
mutex_release(&o3.base.dep_map, _THIS_IP_);
o3.ctx = &t2;
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
ww_mutex_lock_slow(&o3, &t);
}
static void ww_test_edeadlk_acquire_wrong(void)
{
int ret;
mutex_lock(&o2.base);
mutex_release(&o2.base.dep_map, _THIS_IP_);
o2.ctx = &t2;
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
if (!ret)
WWU(&o2);
WWU(&o);
ret = WWL(&o3, &t);
}
static void ww_test_edeadlk_acquire_wrong_slow(void)
{
int ret;
mutex_lock(&o2.base);
mutex_release(&o2.base.dep_map, _THIS_IP_);
o2.ctx = &t2;
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
if (!ret)
WWU(&o2);
WWU(&o);
ww_mutex_lock_slow(&o3, &t);
}
static void ww_test_spin_nest_unlocked(void)
{
spin_lock_nest_lock(&lock_A, &o.base);
U(A);
}
/* This is not a deadlock, because we have X1 to serialize Y1 and Y2 */
static void ww_test_spin_nest_lock(void)
{
spin_lock(&lock_X1);
spin_lock_nest_lock(&lock_Y1, &lock_X1);
spin_lock(&lock_A);
spin_lock_nest_lock(&lock_Y2, &lock_X1);
spin_unlock(&lock_A);
spin_unlock(&lock_Y2);
spin_unlock(&lock_Y1);
spin_unlock(&lock_X1);
}
static void ww_test_unneeded_slow(void)
{
WWAI(&t);
ww_mutex_lock_slow(&o, &t);
}
static void ww_test_context_block(void)
{
int ret;
WWAI(&t);
ret = WWL(&o, &t);
WARN_ON(ret);
WWL1(&o2);
}
static void ww_test_context_try(void)
{
int ret;
WWAI(&t);
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWT(&o2);
WARN_ON(!ret);
WWU(&o2);
WWU(&o);
}
static void ww_test_context_context(void)
{
int ret;
WWAI(&t);
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret);
WWU(&o2);
WWU(&o);
}
static void ww_test_try_block(void)
{
bool ret;
ret = WWT(&o);
WARN_ON(!ret);
WWL1(&o2);
WWU(&o2);
WWU(&o);
}
static void ww_test_try_try(void)
{
bool ret;
ret = WWT(&o);
WARN_ON(!ret);
ret = WWT(&o2);
WARN_ON(!ret);
WWU(&o2);
WWU(&o);
}
static void ww_test_try_context(void)
{
int ret;
ret = WWT(&o);
WARN_ON(!ret);
WWAI(&t);
ret = WWL(&o2, &t);
WARN_ON(ret);
}
static void ww_test_block_block(void)
{
WWL1(&o);
WWL1(&o2);
}
static void ww_test_block_try(void)
{
bool ret;
WWL1(&o);
ret = WWT(&o2);
WARN_ON(!ret);
}
static void ww_test_block_context(void)
{
int ret;
WWL1(&o);
WWAI(&t);
ret = WWL(&o2, &t);
WARN_ON(ret);
}
static void ww_test_spin_block(void)
{
L(A);
U(A);
WWL1(&o);
L(A);
U(A);
WWU(&o);
L(A);
WWL1(&o);
WWU(&o);
U(A);
}
static void ww_test_spin_try(void)
{
bool ret;
L(A);
U(A);
ret = WWT(&o);
WARN_ON(!ret);
L(A);
U(A);
WWU(&o);
L(A);
ret = WWT(&o);
WARN_ON(!ret);
WWU(&o);
U(A);
}
static void ww_test_spin_context(void)
{
int ret;
L(A);
U(A);
WWAI(&t);
ret = WWL(&o, &t);
WARN_ON(ret);
L(A);
U(A);
WWU(&o);
L(A);
ret = WWL(&o, &t);
WARN_ON(ret);
WWU(&o);
U(A);
}
static void ww_tests(void)
{
printk(" --------------------------------------------------------------------------\n");
printk(" | Wound/wait tests |\n");
printk(" ---------------------\n");
print_testname("ww api failures");
dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW);
dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW);
dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW);
pr_cont("\n");
print_testname("ww contexts mixing");
dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW);
dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW);
pr_cont("\n");
print_testname("finishing ww context");
dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW);
dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW);
dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW);
dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW);
pr_cont("\n");
print_testname("locking mismatches");
dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW);
dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW);
dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW);
pr_cont("\n");
print_testname("EDEADLK handling");
dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW);
dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW);
dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW);
dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW);
dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW);
dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW);
dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW);
dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW);
dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW);
dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW);
pr_cont("\n");
print_testname("spinlock nest unlocked");
dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW);
pr_cont("\n");
print_testname("spinlock nest test");
dotest(ww_test_spin_nest_lock, SUCCESS, LOCKTYPE_WW);
pr_cont("\n");
printk(" -----------------------------------------------------\n");
printk(" |block | try |context|\n");
printk(" -----------------------------------------------------\n");
print_testname("context");
dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW);
dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW);
dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW);
pr_cont("\n");
print_testname("try");
dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW);
dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW);
dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW);
pr_cont("\n");
print_testname("block");
dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW);
dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW);
dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW);
pr_cont("\n");
print_testname("spinlock");
dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW);
dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW);
dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW);
pr_cont("\n");
}
/*
* <in hardirq handler>
* read_lock(&A);
* <hardirq disable>
* spin_lock(&B);
* spin_lock(&B);
* read_lock(&A);
*
* is a deadlock.
*/
static void queued_read_lock_hardirq_RE_Er(void)
{
HARDIRQ_ENTER();
read_lock(&rwlock_A);
LOCK(B);
UNLOCK(B);
read_unlock(&rwlock_A);
HARDIRQ_EXIT();
HARDIRQ_DISABLE();
LOCK(B);
read_lock(&rwlock_A);
read_unlock(&rwlock_A);
UNLOCK(B);
HARDIRQ_ENABLE();
}
/*
* <in hardirq handler>
* spin_lock(&B);
* <hardirq disable>
* read_lock(&A);
* read_lock(&A);
* spin_lock(&B);
*
* is not a deadlock.
*/
static void queued_read_lock_hardirq_ER_rE(void)
{
HARDIRQ_ENTER();
LOCK(B);
read_lock(&rwlock_A);
read_unlock(&rwlock_A);
UNLOCK(B);
HARDIRQ_EXIT();
HARDIRQ_DISABLE();
read_lock(&rwlock_A);
LOCK(B);
UNLOCK(B);
read_unlock(&rwlock_A);
HARDIRQ_ENABLE();
}
/*
* <hardirq disable>
* spin_lock(&B);
* read_lock(&A);
* <in hardirq handler>
* spin_lock(&B);
* read_lock(&A);
*
* is a deadlock. Because the two read_lock()s are both non-recursive readers.
*/
static void queued_read_lock_hardirq_inversion(void)
{
HARDIRQ_ENTER();
LOCK(B);
UNLOCK(B);
HARDIRQ_EXIT();
HARDIRQ_DISABLE();
LOCK(B);
read_lock(&rwlock_A);
read_unlock(&rwlock_A);
UNLOCK(B);
HARDIRQ_ENABLE();
read_lock(&rwlock_A);
read_unlock(&rwlock_A);
}
static void queued_read_lock_tests(void)
{
printk(" --------------------------------------------------------------------------\n");
printk(" | queued read lock tests |\n");
printk(" ---------------------------\n");
print_testname("hardirq read-lock/lock-read");
dotest(queued_read_lock_hardirq_RE_Er, FAILURE, LOCKTYPE_RWLOCK);
pr_cont("\n");
print_testname("hardirq lock-read/read-lock");
dotest(queued_read_lock_hardirq_ER_rE, SUCCESS, LOCKTYPE_RWLOCK);
pr_cont("\n");
print_testname("hardirq inversion");
dotest(queued_read_lock_hardirq_inversion, FAILURE, LOCKTYPE_RWLOCK);
pr_cont("\n");
}
static void fs_reclaim_correct_nesting(void)
{
fs_reclaim_acquire(GFP_KERNEL);
might_alloc(GFP_NOFS);
fs_reclaim_release(GFP_KERNEL);
}
static void fs_reclaim_wrong_nesting(void)
{
fs_reclaim_acquire(GFP_KERNEL);
might_alloc(GFP_KERNEL);
fs_reclaim_release(GFP_KERNEL);
}
static void fs_reclaim_protected_nesting(void)
{
unsigned int flags;
fs_reclaim_acquire(GFP_KERNEL);
flags = memalloc_nofs_save();
might_alloc(GFP_KERNEL);
memalloc_nofs_restore(flags);
fs_reclaim_release(GFP_KERNEL);
}
static void fs_reclaim_tests(void)
{
printk(" --------------------\n");
printk(" | fs_reclaim tests |\n");
printk(" --------------------\n");
print_testname("correct nesting");
dotest(fs_reclaim_correct_nesting, SUCCESS, 0);
pr_cont("\n");
print_testname("wrong nesting");
dotest(fs_reclaim_wrong_nesting, FAILURE, 0);
pr_cont("\n");
print_testname("protected nesting");
dotest(fs_reclaim_protected_nesting, SUCCESS, 0);
pr_cont("\n");
}
#define __guard(cleanup) __maybe_unused __attribute__((__cleanup__(cleanup)))
static void hardirq_exit(int *_)
{
HARDIRQ_EXIT();
}
#define HARDIRQ_CONTEXT(name, ...) \
int hardirq_guard_##name __guard(hardirq_exit); \
HARDIRQ_ENTER();
#define NOTTHREADED_HARDIRQ_CONTEXT(name, ...) \
int notthreaded_hardirq_guard_##name __guard(hardirq_exit); \
local_irq_disable(); \
__irq_enter(); \
WARN_ON(!in_irq());
static void softirq_exit(int *_)
{
SOFTIRQ_EXIT();
}
#define SOFTIRQ_CONTEXT(name, ...) \
int softirq_guard_##name __guard(softirq_exit); \
SOFTIRQ_ENTER();
static void rcu_exit(int *_)
{
rcu_read_unlock();
}
#define RCU_CONTEXT(name, ...) \
int rcu_guard_##name __guard(rcu_exit); \
rcu_read_lock();
static void rcu_bh_exit(int *_)
{
rcu_read_unlock_bh();
}
#define RCU_BH_CONTEXT(name, ...) \
int rcu_bh_guard_##name __guard(rcu_bh_exit); \
rcu_read_lock_bh();
static void rcu_sched_exit(int *_)
{
rcu_read_unlock_sched();
}
#define RCU_SCHED_CONTEXT(name, ...) \
int rcu_sched_guard_##name __guard(rcu_sched_exit); \
rcu_read_lock_sched();
static void raw_spinlock_exit(raw_spinlock_t **lock)
{
raw_spin_unlock(*lock);
}
#define RAW_SPINLOCK_CONTEXT(name, lock) \
raw_spinlock_t *raw_spinlock_guard_##name __guard(raw_spinlock_exit) = &(lock); \
raw_spin_lock(&(lock));
static void spinlock_exit(spinlock_t **lock)
{
spin_unlock(*lock);
}
#define SPINLOCK_CONTEXT(name, lock) \
spinlock_t *spinlock_guard_##name __guard(spinlock_exit) = &(lock); \
spin_lock(&(lock));
static void mutex_exit(struct mutex **lock)
{
mutex_unlock(*lock);
}
#define MUTEX_CONTEXT(name, lock) \
struct mutex *mutex_guard_##name __guard(mutex_exit) = &(lock); \
mutex_lock(&(lock));
#define GENERATE_2_CONTEXT_TESTCASE(outer, outer_lock, inner, inner_lock) \
\
static void __maybe_unused inner##_in_##outer(void) \
{ \
outer##_CONTEXT(_, outer_lock); \
{ \
inner##_CONTEXT(_, inner_lock); \
} \
}
/*
* wait contexts (considering PREEMPT_RT)
*
* o: inner is allowed in outer
* x: inner is disallowed in outer
*
* \ inner | RCU | RAW_SPIN | SPIN | MUTEX
* outer \ | | | |
* ---------------+-------+----------+------+-------
* HARDIRQ | o | o | o | x
* ---------------+-------+----------+------+-------
* NOTTHREADED_IRQ| o | o | x | x
* ---------------+-------+----------+------+-------
* SOFTIRQ | o | o | o | x
* ---------------+-------+----------+------+-------
* RCU | o | o | o | x
* ---------------+-------+----------+------+-------
* RCU_BH | o | o | o | x
* ---------------+-------+----------+------+-------
* RCU_SCHED | o | o | x | x
* ---------------+-------+----------+------+-------
* RAW_SPIN | o | o | x | x
* ---------------+-------+----------+------+-------
* SPIN | o | o | o | x
* ---------------+-------+----------+------+-------
* MUTEX | o | o | o | o
* ---------------+-------+----------+------+-------
*/
#define GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(inner, inner_lock) \
GENERATE_2_CONTEXT_TESTCASE(HARDIRQ, , inner, inner_lock) \
GENERATE_2_CONTEXT_TESTCASE(NOTTHREADED_HARDIRQ, , inner, inner_lock) \
GENERATE_2_CONTEXT_TESTCASE(SOFTIRQ, , inner, inner_lock) \
GENERATE_2_CONTEXT_TESTCASE(RCU, , inner, inner_lock) \
GENERATE_2_CONTEXT_TESTCASE(RCU_BH, , inner, inner_lock) \
GENERATE_2_CONTEXT_TESTCASE(RCU_SCHED, , inner, inner_lock) \
GENERATE_2_CONTEXT_TESTCASE(RAW_SPINLOCK, raw_lock_A, inner, inner_lock) \
GENERATE_2_CONTEXT_TESTCASE(SPINLOCK, lock_A, inner, inner_lock) \
GENERATE_2_CONTEXT_TESTCASE(MUTEX, mutex_A, inner, inner_lock)
GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RCU, )
GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RAW_SPINLOCK, raw_lock_B)
GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(SPINLOCK, lock_B)
GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(MUTEX, mutex_B)
/* the outer context allows all kinds of preemption */
#define DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(outer) \
dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \
dotest(RAW_SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
dotest(SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
dotest(MUTEX_in_##outer, SUCCESS, LOCKTYPE_MUTEX); \
/*
* the outer context only allows the preemption introduced by spinlock_t (which
* is a sleepable lock for PREEMPT_RT)
*/
#define DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(outer) \
dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \
dotest(RAW_SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
dotest(SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
dotest(MUTEX_in_##outer, FAILURE, LOCKTYPE_MUTEX); \
/* the outer doesn't allows any kind of preemption */
#define DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(outer) \
dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \
dotest(RAW_SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
dotest(SPINLOCK_in_##outer, FAILURE, LOCKTYPE_SPIN); \
dotest(MUTEX_in_##outer, FAILURE, LOCKTYPE_MUTEX); \
static void wait_context_tests(void)
{
printk(" --------------------------------------------------------------------------\n");
printk(" | wait context tests |\n");
printk(" --------------------------------------------------------------------------\n");
printk(" | rcu | raw | spin |mutex |\n");
printk(" --------------------------------------------------------------------------\n");
print_testname("in hardirq context");
DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(HARDIRQ);
pr_cont("\n");
print_testname("in hardirq context (not threaded)");
DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(NOTTHREADED_HARDIRQ);
pr_cont("\n");
print_testname("in softirq context");
DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SOFTIRQ);
pr_cont("\n");
print_testname("in RCU context");
DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU);
pr_cont("\n");
print_testname("in RCU-bh context");
DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU_BH);
pr_cont("\n");
print_testname("in RCU-sched context");
DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RCU_SCHED);
pr_cont("\n");
print_testname("in RAW_SPINLOCK context");
DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RAW_SPINLOCK);
pr_cont("\n");
print_testname("in SPINLOCK context");
DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SPINLOCK);
pr_cont("\n");
print_testname("in MUTEX context");
DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(MUTEX);
pr_cont("\n");
}
static void local_lock_2(void)
{
local_lock(&local_A); /* IRQ-ON */
local_unlock(&local_A);
HARDIRQ_ENTER();
spin_lock(&lock_A); /* IN-IRQ */
spin_unlock(&lock_A);
HARDIRQ_EXIT()
HARDIRQ_DISABLE();
spin_lock(&lock_A);
local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle, false */
local_unlock(&local_A);
spin_unlock(&lock_A);
HARDIRQ_ENABLE();
}
static void local_lock_3A(void)
{
local_lock(&local_A); /* IRQ-ON */
spin_lock(&lock_B); /* IRQ-ON */
spin_unlock(&lock_B);
local_unlock(&local_A);
HARDIRQ_ENTER();
spin_lock(&lock_A); /* IN-IRQ */
spin_unlock(&lock_A);
HARDIRQ_EXIT()
HARDIRQ_DISABLE();
spin_lock(&lock_A);
local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
local_unlock(&local_A);
spin_unlock(&lock_A);
HARDIRQ_ENABLE();
}
static void local_lock_3B(void)
{
local_lock(&local_A); /* IRQ-ON */
spin_lock(&lock_B); /* IRQ-ON */
spin_unlock(&lock_B);
local_unlock(&local_A);
HARDIRQ_ENTER();
spin_lock(&lock_A); /* IN-IRQ */
spin_unlock(&lock_A);
HARDIRQ_EXIT()
HARDIRQ_DISABLE();
spin_lock(&lock_A);
local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
local_unlock(&local_A);
spin_unlock(&lock_A);
HARDIRQ_ENABLE();
HARDIRQ_DISABLE();
spin_lock(&lock_A);
spin_lock(&lock_B); /* IN-IRQ <-> IRQ-ON cycle, true */
spin_unlock(&lock_B);
spin_unlock(&lock_A);
HARDIRQ_DISABLE();
}
static void local_lock_tests(void)
{
printk(" --------------------------------------------------------------------------\n");
printk(" | local_lock tests |\n");
printk(" ---------------------\n");
print_testname("local_lock inversion 2");
dotest(local_lock_2, SUCCESS, LOCKTYPE_LL);
pr_cont("\n");
print_testname("local_lock inversion 3A");
dotest(local_lock_3A, SUCCESS, LOCKTYPE_LL);
pr_cont("\n");
print_testname("local_lock inversion 3B");
dotest(local_lock_3B, FAILURE, LOCKTYPE_LL);
pr_cont("\n");
}
static void hardirq_deadlock_softirq_not_deadlock(void)
{
/* mutex_A is hardirq-unsafe and softirq-unsafe */
/* mutex_A -> lock_C */
mutex_lock(&mutex_A);
HARDIRQ_DISABLE();
spin_lock(&lock_C);
spin_unlock(&lock_C);
HARDIRQ_ENABLE();
mutex_unlock(&mutex_A);
/* lock_A is hardirq-safe */
HARDIRQ_ENTER();
spin_lock(&lock_A);
spin_unlock(&lock_A);
HARDIRQ_EXIT();
/* lock_A -> lock_B */
HARDIRQ_DISABLE();
spin_lock(&lock_A);
spin_lock(&lock_B);
spin_unlock(&lock_B);
spin_unlock(&lock_A);
HARDIRQ_ENABLE();
/* lock_B -> lock_C */
HARDIRQ_DISABLE();
spin_lock(&lock_B);
spin_lock(&lock_C);
spin_unlock(&lock_C);
spin_unlock(&lock_B);
HARDIRQ_ENABLE();
/* lock_D is softirq-safe */
SOFTIRQ_ENTER();
spin_lock(&lock_D);
spin_unlock(&lock_D);
SOFTIRQ_EXIT();
/* And lock_D is hardirq-unsafe */
SOFTIRQ_DISABLE();
spin_lock(&lock_D);
spin_unlock(&lock_D);
SOFTIRQ_ENABLE();
/*
* mutex_A -> lock_C -> lock_D is softirq-unsafe -> softirq-safe, not
* deadlock.
*
* lock_A -> lock_B -> lock_C -> lock_D is hardirq-safe ->
* hardirq-unsafe, deadlock.
*/
HARDIRQ_DISABLE();
spin_lock(&lock_C);
spin_lock(&lock_D);
spin_unlock(&lock_D);
spin_unlock(&lock_C);
HARDIRQ_ENABLE();
}
void locking_selftest(void)
{
/*
* Got a locking failure before the selftest ran?
*/
if (!debug_locks) {
printk("----------------------------------\n");
printk("| Locking API testsuite disabled |\n");
printk("----------------------------------\n");
return;
}
/*
* treats read_lock() as recursive read locks for testing purpose
*/
force_read_lock_recursive = 1;
/*
* Run the testsuite:
*/
printk("------------------------\n");
printk("| Locking API testsuite:\n");
printk("----------------------------------------------------------------------------\n");
printk(" | spin |wlock |rlock |mutex | wsem | rsem |rtmutex\n");
printk(" --------------------------------------------------------------------------\n");
init_shared_classes();
lockdep_set_selftest_task(current);
DO_TESTCASE_6R("A-A deadlock", AA);
DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA);
DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC);
DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA);
DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA);
DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA);
DO_TESTCASE_6("double unlock", double_unlock);
DO_TESTCASE_6("initialize held", init_held);
printk(" --------------------------------------------------------------------------\n");
print_testname("recursive read-lock");
pr_cont(" |");
dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
pr_cont(" |");
dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
pr_cont("\n");
print_testname("recursive read-lock #2");
pr_cont(" |");
dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK);
pr_cont(" |");
dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
pr_cont("\n");
print_testname("mixed read-write-lock");
pr_cont(" |");
dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK);
pr_cont(" |");
dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM);
pr_cont("\n");
print_testname("mixed write-read-lock");
pr_cont(" |");
dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK);
pr_cont(" |");
dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
pr_cont("\n");
print_testname("mixed read-lock/lock-write ABBA");
pr_cont(" |");
dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
pr_cont(" |");
dotest(rwsem_ABBA1, FAILURE, LOCKTYPE_RWSEM);
print_testname("mixed read-lock/lock-read ABBA");
pr_cont(" |");
dotest(rlock_ABBA2, SUCCESS, LOCKTYPE_RWLOCK);
pr_cont(" |");
dotest(rwsem_ABBA2, FAILURE, LOCKTYPE_RWSEM);
print_testname("mixed write-lock/lock-write ABBA");
pr_cont(" |");
dotest(rlock_ABBA3, FAILURE, LOCKTYPE_RWLOCK);
pr_cont(" |");
dotest(rwsem_ABBA3, FAILURE, LOCKTYPE_RWSEM);
print_testname("chain cached mixed R-L/L-W ABBA");
pr_cont(" |");
dotest(rlock_chaincache_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
DO_TESTCASE_6x1RRB("rlock W1R2/W2R3/W3R1", W1R2_W2R3_W3R1);
DO_TESTCASE_6x1RRB("rlock W1W2/R2R3/W3R1", W1W2_R2R3_W3R1);
DO_TESTCASE_6x1RR("rlock W1W2/R2R3/R3W1", W1W2_R2R3_R3W1);
DO_TESTCASE_6x1RR("rlock W1R2/R2R3/W3W1", W1R2_R2R3_W3W1);
printk(" --------------------------------------------------------------------------\n");
/*
* irq-context testcases:
*/
DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1);
DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A);
DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B);
DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3);
DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4);
DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion);
DO_TESTCASE_6x2x2RW("irq read-recursion", irq_read_recursion);
DO_TESTCASE_6x2x2RW("irq read-recursion #2", irq_read_recursion2);
DO_TESTCASE_6x2x2RW("irq read-recursion #3", irq_read_recursion3);
ww_tests();
force_read_lock_recursive = 0;
/*
* queued_read_lock() specific test cases can be put here
*/
if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS))
queued_read_lock_tests();
fs_reclaim_tests();
/* Wait context test cases that are specific for RAW_LOCK_NESTING */
if (IS_ENABLED(CONFIG_PROVE_RAW_LOCK_NESTING))
wait_context_tests();
local_lock_tests();
print_testname("hardirq_unsafe_softirq_safe");
dotest(hardirq_deadlock_softirq_not_deadlock, FAILURE, LOCKTYPE_SPECIAL);
pr_cont("\n");
if (unexpected_testcase_failures) {
printk("-----------------------------------------------------------------\n");
debug_locks = 0;
printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
unexpected_testcase_failures, testcase_total);
printk("-----------------------------------------------------------------\n");
} else if (expected_testcase_failures && testcase_successes) {
printk("--------------------------------------------------------\n");
printk("%3d out of %3d testcases failed, as expected. |\n",
expected_testcase_failures, testcase_total);
printk("----------------------------------------------------\n");
debug_locks = 1;
} else if (expected_testcase_failures && !testcase_successes) {
printk("--------------------------------------------------------\n");
printk("All %3d testcases failed, as expected. |\n",
expected_testcase_failures);
printk("----------------------------------------\n");
debug_locks = 1;
} else {
printk("-------------------------------------------------------\n");
printk("Good, all %3d testcases passed! |\n",
testcase_successes);
printk("---------------------------------\n");
debug_locks = 1;
}
lockdep_set_selftest_task(NULL);
debug_locks_silent = 0;
}
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