mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2024-12-28 08:42:10 +00:00
0302d2fd6e
The below commit introduces a dummy lockdep map, but didn't get
the initialization quite right (it should mimic the initialization
of the real ww_mutex lockdep maps). It also introduced a separate
locking api selftest failure. Fix these.
Closes: https://lore.kernel.org/lkml/Zw19sMtnKdyOVQoh@boqun-archlinux/
Fixes: 823a566221 ("locking/ww_mutex: Adjust to lockdep nest_lock requirements")
Reported-by: Boqun Feng <boqun.feng@gmail.com>
Suggested-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20241127085430.3045-1-thomas.hellstrom@linux.intel.com
2990 lines
66 KiB
C
2990 lines
66 KiB
C
// 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>
|
|
|
|
#ifdef CONFIG_PREEMPT_RT
|
|
# define NON_RT(...)
|
|
#else
|
|
# define NON_RT(...) __VA_ARGS__
|
|
#endif
|
|
|
|
/*
|
|
* Change this to 1 if you want to see the failure printouts:
|
|
*/
|
|
static unsigned int debug_locks_verbose;
|
|
unsigned int force_read_lock_recursive;
|
|
|
|
static DEFINE_WD_CLASS(ww_lockdep);
|
|
|
|
static int __init setup_debug_locks_verbose(char *str)
|
|
{
|
|
get_option(&str, &debug_locks_verbose);
|
|
|
|
return 1;
|
|
}
|
|
|
|
__setup("debug_locks_verbose=", setup_debug_locks_verbose);
|
|
|
|
#define FAILURE 0
|
|
#define SUCCESS 1
|
|
|
|
#define LOCKTYPE_SPIN 0x1
|
|
#define LOCKTYPE_RWLOCK 0x2
|
|
#define LOCKTYPE_MUTEX 0x4
|
|
#define LOCKTYPE_RWSEM 0x8
|
|
#define LOCKTYPE_WW 0x10
|
|
#define LOCKTYPE_RTMUTEX 0x20
|
|
#define LOCKTYPE_LL 0x40
|
|
#define LOCKTYPE_SPECIAL 0x80
|
|
|
|
static struct ww_acquire_ctx t, t2;
|
|
static struct ww_mutex o, o2, o3;
|
|
|
|
/*
|
|
* Normal standalone locks, for the circular and irq-context
|
|
* dependency tests:
|
|
*/
|
|
static DEFINE_SPINLOCK(lock_A);
|
|
static DEFINE_SPINLOCK(lock_B);
|
|
static DEFINE_SPINLOCK(lock_C);
|
|
static DEFINE_SPINLOCK(lock_D);
|
|
|
|
static DEFINE_RAW_SPINLOCK(raw_lock_A);
|
|
static DEFINE_RAW_SPINLOCK(raw_lock_B);
|
|
|
|
static DEFINE_RWLOCK(rwlock_A);
|
|
static DEFINE_RWLOCK(rwlock_B);
|
|
static DEFINE_RWLOCK(rwlock_C);
|
|
static DEFINE_RWLOCK(rwlock_D);
|
|
|
|
static DEFINE_MUTEX(mutex_A);
|
|
static DEFINE_MUTEX(mutex_B);
|
|
static DEFINE_MUTEX(mutex_C);
|
|
static DEFINE_MUTEX(mutex_D);
|
|
|
|
static DECLARE_RWSEM(rwsem_A);
|
|
static DECLARE_RWSEM(rwsem_B);
|
|
static DECLARE_RWSEM(rwsem_C);
|
|
static DECLARE_RWSEM(rwsem_D);
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
|
|
static DEFINE_RT_MUTEX(rtmutex_A);
|
|
static DEFINE_RT_MUTEX(rtmutex_B);
|
|
static DEFINE_RT_MUTEX(rtmutex_C);
|
|
static DEFINE_RT_MUTEX(rtmutex_D);
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Locks that we initialize dynamically as well so that
|
|
* e.g. X1 and X2 becomes two instances of the same class,
|
|
* but X* and Y* are different classes. We do this so that
|
|
* we do not trigger a real lockup:
|
|
*/
|
|
static DEFINE_SPINLOCK(lock_X1);
|
|
static DEFINE_SPINLOCK(lock_X2);
|
|
static DEFINE_SPINLOCK(lock_Y1);
|
|
static DEFINE_SPINLOCK(lock_Y2);
|
|
static DEFINE_SPINLOCK(lock_Z1);
|
|
static DEFINE_SPINLOCK(lock_Z2);
|
|
|
|
static DEFINE_RWLOCK(rwlock_X1);
|
|
static DEFINE_RWLOCK(rwlock_X2);
|
|
static DEFINE_RWLOCK(rwlock_Y1);
|
|
static DEFINE_RWLOCK(rwlock_Y2);
|
|
static DEFINE_RWLOCK(rwlock_Z1);
|
|
static DEFINE_RWLOCK(rwlock_Z2);
|
|
|
|
static DEFINE_MUTEX(mutex_X1);
|
|
static DEFINE_MUTEX(mutex_X2);
|
|
static DEFINE_MUTEX(mutex_Y1);
|
|
static DEFINE_MUTEX(mutex_Y2);
|
|
static DEFINE_MUTEX(mutex_Z1);
|
|
static DEFINE_MUTEX(mutex_Z2);
|
|
|
|
static DECLARE_RWSEM(rwsem_X1);
|
|
static DECLARE_RWSEM(rwsem_X2);
|
|
static DECLARE_RWSEM(rwsem_Y1);
|
|
static DECLARE_RWSEM(rwsem_Y2);
|
|
static DECLARE_RWSEM(rwsem_Z1);
|
|
static DECLARE_RWSEM(rwsem_Z2);
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
|
|
static DEFINE_RT_MUTEX(rtmutex_X1);
|
|
static DEFINE_RT_MUTEX(rtmutex_X2);
|
|
static DEFINE_RT_MUTEX(rtmutex_Y1);
|
|
static DEFINE_RT_MUTEX(rtmutex_Y2);
|
|
static DEFINE_RT_MUTEX(rtmutex_Z1);
|
|
static DEFINE_RT_MUTEX(rtmutex_Z2);
|
|
|
|
#endif
|
|
|
|
static DEFINE_PER_CPU(local_lock_t, local_A);
|
|
|
|
/*
|
|
* non-inlined runtime initializers, to let separate locks share
|
|
* the same lock-class:
|
|
*/
|
|
#define INIT_CLASS_FUNC(class) \
|
|
static noinline void \
|
|
init_class_##class(spinlock_t *lock, rwlock_t *rwlock, \
|
|
struct mutex *mutex, struct rw_semaphore *rwsem)\
|
|
{ \
|
|
spin_lock_init(lock); \
|
|
rwlock_init(rwlock); \
|
|
mutex_init(mutex); \
|
|
init_rwsem(rwsem); \
|
|
}
|
|
|
|
INIT_CLASS_FUNC(X)
|
|
INIT_CLASS_FUNC(Y)
|
|
INIT_CLASS_FUNC(Z)
|
|
|
|
static void init_shared_classes(void)
|
|
{
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
static struct lock_class_key rt_X, rt_Y, rt_Z;
|
|
|
|
__rt_mutex_init(&rtmutex_X1, __func__, &rt_X);
|
|
__rt_mutex_init(&rtmutex_X2, __func__, &rt_X);
|
|
__rt_mutex_init(&rtmutex_Y1, __func__, &rt_Y);
|
|
__rt_mutex_init(&rtmutex_Y2, __func__, &rt_Y);
|
|
__rt_mutex_init(&rtmutex_Z1, __func__, &rt_Z);
|
|
__rt_mutex_init(&rtmutex_Z2, __func__, &rt_Z);
|
|
#endif
|
|
|
|
init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1);
|
|
init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2);
|
|
|
|
init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1);
|
|
init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2);
|
|
|
|
init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1);
|
|
init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2);
|
|
}
|
|
|
|
/*
|
|
* For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests.
|
|
* The following functions use a lock from a simulated hardirq/softirq
|
|
* context, causing the locks to be marked as hardirq-safe/softirq-safe:
|
|
*/
|
|
|
|
#define HARDIRQ_DISABLE local_irq_disable
|
|
#define HARDIRQ_ENABLE local_irq_enable
|
|
|
|
#define HARDIRQ_ENTER() \
|
|
local_irq_disable(); \
|
|
__irq_enter(); \
|
|
lockdep_hardirq_threaded(); \
|
|
WARN_ON(!in_irq());
|
|
|
|
#define HARDIRQ_EXIT() \
|
|
__irq_exit(); \
|
|
local_irq_enable();
|
|
|
|
#define SOFTIRQ_DISABLE local_bh_disable
|
|
#define SOFTIRQ_ENABLE local_bh_enable
|
|
|
|
#define SOFTIRQ_ENTER() \
|
|
local_bh_disable(); \
|
|
local_irq_disable(); \
|
|
lockdep_softirq_enter(); \
|
|
WARN_ON(!in_softirq());
|
|
|
|
#define SOFTIRQ_EXIT() \
|
|
lockdep_softirq_exit(); \
|
|
local_irq_enable(); \
|
|
local_bh_enable();
|
|
|
|
/*
|
|
* Shortcuts for lock/unlock API variants, to keep
|
|
* the testcases compact:
|
|
*/
|
|
#define L(x) spin_lock(&lock_##x)
|
|
#define U(x) spin_unlock(&lock_##x)
|
|
#define LU(x) L(x); U(x)
|
|
#define SI(x) spin_lock_init(&lock_##x)
|
|
|
|
#define WL(x) write_lock(&rwlock_##x)
|
|
#define WU(x) write_unlock(&rwlock_##x)
|
|
#define WLU(x) WL(x); WU(x)
|
|
|
|
#define RL(x) read_lock(&rwlock_##x)
|
|
#define RU(x) read_unlock(&rwlock_##x)
|
|
#define RLU(x) RL(x); RU(x)
|
|
#define RWI(x) rwlock_init(&rwlock_##x)
|
|
|
|
#define ML(x) mutex_lock(&mutex_##x)
|
|
#define MU(x) mutex_unlock(&mutex_##x)
|
|
#define MI(x) mutex_init(&mutex_##x)
|
|
|
|
#define RTL(x) rt_mutex_lock(&rtmutex_##x)
|
|
#define RTU(x) rt_mutex_unlock(&rtmutex_##x)
|
|
#define RTI(x) rt_mutex_init(&rtmutex_##x)
|
|
|
|
#define WSL(x) down_write(&rwsem_##x)
|
|
#define WSU(x) up_write(&rwsem_##x)
|
|
|
|
#define RSL(x) down_read(&rwsem_##x)
|
|
#define RSU(x) up_read(&rwsem_##x)
|
|
#define RWSI(x) init_rwsem(&rwsem_##x)
|
|
|
|
#ifndef CONFIG_DEBUG_WW_MUTEX_SLOWPATH
|
|
#define WWAI(x) ww_acquire_init(x, &ww_lockdep)
|
|
#else
|
|
#define WWAI(x) do { ww_acquire_init(x, &ww_lockdep); (x)->deadlock_inject_countdown = ~0U; } while (0)
|
|
#endif
|
|
#define WWAD(x) ww_acquire_done(x)
|
|
#define WWAF(x) ww_acquire_fini(x)
|
|
|
|
#define WWL(x, c) ww_mutex_lock(x, c)
|
|
#define WWT(x) ww_mutex_trylock(x, NULL)
|
|
#define WWL1(x) ww_mutex_lock(x, NULL)
|
|
#define WWU(x) ww_mutex_unlock(x)
|
|
|
|
|
|
#define LOCK_UNLOCK_2(x,y) LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x)
|
|
|
|
/*
|
|
* Generate different permutations of the same testcase, using
|
|
* the same basic lock-dependency/state events:
|
|
*/
|
|
|
|
#define GENERATE_TESTCASE(name) \
|
|
\
|
|
static void name(void) { E(); }
|
|
|
|
#define GENERATE_PERMUTATIONS_2_EVENTS(name) \
|
|
\
|
|
static void name##_12(void) { E1(); E2(); } \
|
|
static void name##_21(void) { E2(); E1(); }
|
|
|
|
#define GENERATE_PERMUTATIONS_3_EVENTS(name) \
|
|
\
|
|
static void name##_123(void) { E1(); E2(); E3(); } \
|
|
static void name##_132(void) { E1(); E3(); E2(); } \
|
|
static void name##_213(void) { E2(); E1(); E3(); } \
|
|
static void name##_231(void) { E2(); E3(); E1(); } \
|
|
static void name##_312(void) { E3(); E1(); E2(); } \
|
|
static void name##_321(void) { E3(); E2(); E1(); }
|
|
|
|
/*
|
|
* AA deadlock:
|
|
*/
|
|
|
|
#define E() \
|
|
\
|
|
LOCK(X1); \
|
|
LOCK(X2); /* this one should fail */
|
|
|
|
/*
|
|
* 6 testcases:
|
|
*/
|
|
#include "locking-selftest-spin.h"
|
|
GENERATE_TESTCASE(AA_spin)
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_TESTCASE(AA_wlock)
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_TESTCASE(AA_rlock)
|
|
#include "locking-selftest-mutex.h"
|
|
GENERATE_TESTCASE(AA_mutex)
|
|
#include "locking-selftest-wsem.h"
|
|
GENERATE_TESTCASE(AA_wsem)
|
|
#include "locking-selftest-rsem.h"
|
|
GENERATE_TESTCASE(AA_rsem)
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
#include "locking-selftest-rtmutex.h"
|
|
GENERATE_TESTCASE(AA_rtmutex);
|
|
#endif
|
|
|
|
#undef E
|
|
|
|
/*
|
|
* Special-case for read-locking, they are
|
|
* allowed to recurse on the same lock class:
|
|
*/
|
|
static void rlock_AA1(void)
|
|
{
|
|
RL(X1);
|
|
RL(X1); // this one should NOT fail
|
|
}
|
|
|
|
static void rlock_AA1B(void)
|
|
{
|
|
RL(X1);
|
|
RL(X2); // this one should NOT fail
|
|
}
|
|
|
|
static void rsem_AA1(void)
|
|
{
|
|
RSL(X1);
|
|
RSL(X1); // this one should fail
|
|
}
|
|
|
|
static void rsem_AA1B(void)
|
|
{
|
|
RSL(X1);
|
|
RSL(X2); // this one should fail
|
|
}
|
|
/*
|
|
* The mixing of read and write locks is not allowed:
|
|
*/
|
|
static void rlock_AA2(void)
|
|
{
|
|
RL(X1);
|
|
WL(X2); // this one should fail
|
|
}
|
|
|
|
static void rsem_AA2(void)
|
|
{
|
|
RSL(X1);
|
|
WSL(X2); // this one should fail
|
|
}
|
|
|
|
static void rlock_AA3(void)
|
|
{
|
|
WL(X1);
|
|
RL(X2); // this one should fail
|
|
}
|
|
|
|
static void rsem_AA3(void)
|
|
{
|
|
WSL(X1);
|
|
RSL(X2); // this one should fail
|
|
}
|
|
|
|
/*
|
|
* read_lock(A)
|
|
* spin_lock(B)
|
|
* spin_lock(B)
|
|
* write_lock(A)
|
|
*/
|
|
static void rlock_ABBA1(void)
|
|
{
|
|
RL(X1);
|
|
L(Y1);
|
|
U(Y1);
|
|
RU(X1);
|
|
|
|
L(Y1);
|
|
WL(X1);
|
|
WU(X1);
|
|
U(Y1); // should fail
|
|
}
|
|
|
|
static void rwsem_ABBA1(void)
|
|
{
|
|
RSL(X1);
|
|
ML(Y1);
|
|
MU(Y1);
|
|
RSU(X1);
|
|
|
|
ML(Y1);
|
|
WSL(X1);
|
|
WSU(X1);
|
|
MU(Y1); // should fail
|
|
}
|
|
|
|
/*
|
|
* read_lock(A)
|
|
* spin_lock(B)
|
|
* spin_lock(B)
|
|
* write_lock(A)
|
|
*
|
|
* This test case is aimed at poking whether the chain cache prevents us from
|
|
* detecting a read-lock/lock-write deadlock: if the chain cache doesn't differ
|
|
* read/write locks, the following case may happen
|
|
*
|
|
* { read_lock(A)->lock(B) dependency exists }
|
|
*
|
|
* P0:
|
|
* lock(B);
|
|
* read_lock(A);
|
|
*
|
|
* { Not a deadlock, B -> A is added in the chain cache }
|
|
*
|
|
* P1:
|
|
* lock(B);
|
|
* write_lock(A);
|
|
*
|
|
* { B->A found in chain cache, not reported as a deadlock }
|
|
*
|
|
*/
|
|
static void rlock_chaincache_ABBA1(void)
|
|
{
|
|
RL(X1);
|
|
L(Y1);
|
|
U(Y1);
|
|
RU(X1);
|
|
|
|
L(Y1);
|
|
RL(X1);
|
|
RU(X1);
|
|
U(Y1);
|
|
|
|
L(Y1);
|
|
WL(X1);
|
|
WU(X1);
|
|
U(Y1); // should fail
|
|
}
|
|
|
|
/*
|
|
* read_lock(A)
|
|
* spin_lock(B)
|
|
* spin_lock(B)
|
|
* read_lock(A)
|
|
*/
|
|
static void rlock_ABBA2(void)
|
|
{
|
|
RL(X1);
|
|
L(Y1);
|
|
U(Y1);
|
|
RU(X1);
|
|
|
|
L(Y1);
|
|
RL(X1);
|
|
RU(X1);
|
|
U(Y1); // should NOT fail
|
|
}
|
|
|
|
static void rwsem_ABBA2(void)
|
|
{
|
|
RSL(X1);
|
|
ML(Y1);
|
|
MU(Y1);
|
|
RSU(X1);
|
|
|
|
ML(Y1);
|
|
RSL(X1);
|
|
RSU(X1);
|
|
MU(Y1); // should fail
|
|
}
|
|
|
|
|
|
/*
|
|
* write_lock(A)
|
|
* spin_lock(B)
|
|
* spin_lock(B)
|
|
* write_lock(A)
|
|
*/
|
|
static void rlock_ABBA3(void)
|
|
{
|
|
WL(X1);
|
|
L(Y1);
|
|
U(Y1);
|
|
WU(X1);
|
|
|
|
L(Y1);
|
|
WL(X1);
|
|
WU(X1);
|
|
U(Y1); // should fail
|
|
}
|
|
|
|
static void rwsem_ABBA3(void)
|
|
{
|
|
WSL(X1);
|
|
ML(Y1);
|
|
MU(Y1);
|
|
WSU(X1);
|
|
|
|
ML(Y1);
|
|
WSL(X1);
|
|
WSU(X1);
|
|
MU(Y1); // should fail
|
|
}
|
|
|
|
/*
|
|
* ABBA deadlock:
|
|
*/
|
|
|
|
#define E() \
|
|
\
|
|
LOCK_UNLOCK_2(A, B); \
|
|
LOCK_UNLOCK_2(B, A); /* fail */
|
|
|
|
/*
|
|
* 6 testcases:
|
|
*/
|
|
#include "locking-selftest-spin.h"
|
|
GENERATE_TESTCASE(ABBA_spin)
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_TESTCASE(ABBA_wlock)
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_TESTCASE(ABBA_rlock)
|
|
#include "locking-selftest-mutex.h"
|
|
GENERATE_TESTCASE(ABBA_mutex)
|
|
#include "locking-selftest-wsem.h"
|
|
GENERATE_TESTCASE(ABBA_wsem)
|
|
#include "locking-selftest-rsem.h"
|
|
GENERATE_TESTCASE(ABBA_rsem)
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
#include "locking-selftest-rtmutex.h"
|
|
GENERATE_TESTCASE(ABBA_rtmutex);
|
|
#endif
|
|
|
|
#undef E
|
|
|
|
/*
|
|
* AB BC CA deadlock:
|
|
*/
|
|
|
|
#define E() \
|
|
\
|
|
LOCK_UNLOCK_2(A, B); \
|
|
LOCK_UNLOCK_2(B, C); \
|
|
LOCK_UNLOCK_2(C, A); /* fail */
|
|
|
|
/*
|
|
* 6 testcases:
|
|
*/
|
|
#include "locking-selftest-spin.h"
|
|
GENERATE_TESTCASE(ABBCCA_spin)
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_TESTCASE(ABBCCA_wlock)
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_TESTCASE(ABBCCA_rlock)
|
|
#include "locking-selftest-mutex.h"
|
|
GENERATE_TESTCASE(ABBCCA_mutex)
|
|
#include "locking-selftest-wsem.h"
|
|
GENERATE_TESTCASE(ABBCCA_wsem)
|
|
#include "locking-selftest-rsem.h"
|
|
GENERATE_TESTCASE(ABBCCA_rsem)
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
#include "locking-selftest-rtmutex.h"
|
|
GENERATE_TESTCASE(ABBCCA_rtmutex);
|
|
#endif
|
|
|
|
#undef E
|
|
|
|
/*
|
|
* AB CA BC deadlock:
|
|
*/
|
|
|
|
#define E() \
|
|
\
|
|
LOCK_UNLOCK_2(A, B); \
|
|
LOCK_UNLOCK_2(C, A); \
|
|
LOCK_UNLOCK_2(B, C); /* fail */
|
|
|
|
/*
|
|
* 6 testcases:
|
|
*/
|
|
#include "locking-selftest-spin.h"
|
|
GENERATE_TESTCASE(ABCABC_spin)
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_TESTCASE(ABCABC_wlock)
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_TESTCASE(ABCABC_rlock)
|
|
#include "locking-selftest-mutex.h"
|
|
GENERATE_TESTCASE(ABCABC_mutex)
|
|
#include "locking-selftest-wsem.h"
|
|
GENERATE_TESTCASE(ABCABC_wsem)
|
|
#include "locking-selftest-rsem.h"
|
|
GENERATE_TESTCASE(ABCABC_rsem)
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
#include "locking-selftest-rtmutex.h"
|
|
GENERATE_TESTCASE(ABCABC_rtmutex);
|
|
#endif
|
|
|
|
#undef E
|
|
|
|
/*
|
|
* AB BC CD DA deadlock:
|
|
*/
|
|
|
|
#define E() \
|
|
\
|
|
LOCK_UNLOCK_2(A, B); \
|
|
LOCK_UNLOCK_2(B, C); \
|
|
LOCK_UNLOCK_2(C, D); \
|
|
LOCK_UNLOCK_2(D, A); /* fail */
|
|
|
|
/*
|
|
* 6 testcases:
|
|
*/
|
|
#include "locking-selftest-spin.h"
|
|
GENERATE_TESTCASE(ABBCCDDA_spin)
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_TESTCASE(ABBCCDDA_wlock)
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_TESTCASE(ABBCCDDA_rlock)
|
|
#include "locking-selftest-mutex.h"
|
|
GENERATE_TESTCASE(ABBCCDDA_mutex)
|
|
#include "locking-selftest-wsem.h"
|
|
GENERATE_TESTCASE(ABBCCDDA_wsem)
|
|
#include "locking-selftest-rsem.h"
|
|
GENERATE_TESTCASE(ABBCCDDA_rsem)
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
#include "locking-selftest-rtmutex.h"
|
|
GENERATE_TESTCASE(ABBCCDDA_rtmutex);
|
|
#endif
|
|
|
|
#undef E
|
|
|
|
/*
|
|
* AB CD BD DA deadlock:
|
|
*/
|
|
#define E() \
|
|
\
|
|
LOCK_UNLOCK_2(A, B); \
|
|
LOCK_UNLOCK_2(C, D); \
|
|
LOCK_UNLOCK_2(B, D); \
|
|
LOCK_UNLOCK_2(D, A); /* fail */
|
|
|
|
/*
|
|
* 6 testcases:
|
|
*/
|
|
#include "locking-selftest-spin.h"
|
|
GENERATE_TESTCASE(ABCDBDDA_spin)
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_TESTCASE(ABCDBDDA_wlock)
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_TESTCASE(ABCDBDDA_rlock)
|
|
#include "locking-selftest-mutex.h"
|
|
GENERATE_TESTCASE(ABCDBDDA_mutex)
|
|
#include "locking-selftest-wsem.h"
|
|
GENERATE_TESTCASE(ABCDBDDA_wsem)
|
|
#include "locking-selftest-rsem.h"
|
|
GENERATE_TESTCASE(ABCDBDDA_rsem)
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
#include "locking-selftest-rtmutex.h"
|
|
GENERATE_TESTCASE(ABCDBDDA_rtmutex);
|
|
#endif
|
|
|
|
#undef E
|
|
|
|
/*
|
|
* AB CD BC DA deadlock:
|
|
*/
|
|
#define E() \
|
|
\
|
|
LOCK_UNLOCK_2(A, B); \
|
|
LOCK_UNLOCK_2(C, D); \
|
|
LOCK_UNLOCK_2(B, C); \
|
|
LOCK_UNLOCK_2(D, A); /* fail */
|
|
|
|
/*
|
|
* 6 testcases:
|
|
*/
|
|
#include "locking-selftest-spin.h"
|
|
GENERATE_TESTCASE(ABCDBCDA_spin)
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_TESTCASE(ABCDBCDA_wlock)
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_TESTCASE(ABCDBCDA_rlock)
|
|
#include "locking-selftest-mutex.h"
|
|
GENERATE_TESTCASE(ABCDBCDA_mutex)
|
|
#include "locking-selftest-wsem.h"
|
|
GENERATE_TESTCASE(ABCDBCDA_wsem)
|
|
#include "locking-selftest-rsem.h"
|
|
GENERATE_TESTCASE(ABCDBCDA_rsem)
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
#include "locking-selftest-rtmutex.h"
|
|
GENERATE_TESTCASE(ABCDBCDA_rtmutex);
|
|
#endif
|
|
|
|
#undef E
|
|
|
|
#ifdef CONFIG_PREEMPT_RT
|
|
# define RT_PREPARE_DBL_UNLOCK() { migrate_disable(); rcu_read_lock(); }
|
|
#else
|
|
# define RT_PREPARE_DBL_UNLOCK()
|
|
#endif
|
|
/*
|
|
* Double unlock:
|
|
*/
|
|
#define E() \
|
|
\
|
|
LOCK(A); \
|
|
RT_PREPARE_DBL_UNLOCK(); \
|
|
UNLOCK(A); \
|
|
UNLOCK(A); /* fail */
|
|
|
|
/*
|
|
* 6 testcases:
|
|
*/
|
|
#include "locking-selftest-spin.h"
|
|
GENERATE_TESTCASE(double_unlock_spin)
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_TESTCASE(double_unlock_wlock)
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_TESTCASE(double_unlock_rlock)
|
|
#include "locking-selftest-mutex.h"
|
|
GENERATE_TESTCASE(double_unlock_mutex)
|
|
#include "locking-selftest-wsem.h"
|
|
GENERATE_TESTCASE(double_unlock_wsem)
|
|
#include "locking-selftest-rsem.h"
|
|
GENERATE_TESTCASE(double_unlock_rsem)
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
#include "locking-selftest-rtmutex.h"
|
|
GENERATE_TESTCASE(double_unlock_rtmutex);
|
|
#endif
|
|
|
|
#undef E
|
|
|
|
/*
|
|
* initializing a held lock:
|
|
*/
|
|
#define E() \
|
|
\
|
|
LOCK(A); \
|
|
INIT(A); /* fail */
|
|
|
|
/*
|
|
* 6 testcases:
|
|
*/
|
|
#include "locking-selftest-spin.h"
|
|
GENERATE_TESTCASE(init_held_spin)
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_TESTCASE(init_held_wlock)
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_TESTCASE(init_held_rlock)
|
|
#include "locking-selftest-mutex.h"
|
|
GENERATE_TESTCASE(init_held_mutex)
|
|
#include "locking-selftest-wsem.h"
|
|
GENERATE_TESTCASE(init_held_wsem)
|
|
#include "locking-selftest-rsem.h"
|
|
GENERATE_TESTCASE(init_held_rsem)
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
#include "locking-selftest-rtmutex.h"
|
|
GENERATE_TESTCASE(init_held_rtmutex);
|
|
#endif
|
|
|
|
#undef E
|
|
|
|
/*
|
|
* locking an irq-safe lock with irqs enabled:
|
|
*/
|
|
#define E1() \
|
|
\
|
|
IRQ_ENTER(); \
|
|
LOCK(A); \
|
|
UNLOCK(A); \
|
|
IRQ_EXIT();
|
|
|
|
#define E2() \
|
|
\
|
|
LOCK(A); \
|
|
UNLOCK(A);
|
|
|
|
/*
|
|
* Generate 24 testcases:
|
|
*/
|
|
#include "locking-selftest-spin-hardirq.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin)
|
|
|
|
#include "locking-selftest-rlock-hardirq.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock)
|
|
|
|
#include "locking-selftest-wlock-hardirq.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock)
|
|
|
|
#ifndef CONFIG_PREEMPT_RT
|
|
#include "locking-selftest-spin-softirq.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin)
|
|
|
|
#include "locking-selftest-rlock-softirq.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock)
|
|
|
|
#include "locking-selftest-wlock-softirq.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock)
|
|
#endif
|
|
|
|
#undef E1
|
|
#undef E2
|
|
|
|
#ifndef CONFIG_PREEMPT_RT
|
|
/*
|
|
* Enabling hardirqs with a softirq-safe lock held:
|
|
*/
|
|
#define E1() \
|
|
\
|
|
SOFTIRQ_ENTER(); \
|
|
LOCK(A); \
|
|
UNLOCK(A); \
|
|
SOFTIRQ_EXIT();
|
|
|
|
#define E2() \
|
|
\
|
|
HARDIRQ_DISABLE(); \
|
|
LOCK(A); \
|
|
HARDIRQ_ENABLE(); \
|
|
UNLOCK(A);
|
|
|
|
/*
|
|
* Generate 12 testcases:
|
|
*/
|
|
#include "locking-selftest-spin.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin)
|
|
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock)
|
|
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock)
|
|
|
|
#undef E1
|
|
#undef E2
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Enabling irqs with an irq-safe lock held:
|
|
*/
|
|
#define E1() \
|
|
\
|
|
IRQ_ENTER(); \
|
|
LOCK(A); \
|
|
UNLOCK(A); \
|
|
IRQ_EXIT();
|
|
|
|
#define E2() \
|
|
\
|
|
IRQ_DISABLE(); \
|
|
LOCK(A); \
|
|
IRQ_ENABLE(); \
|
|
UNLOCK(A);
|
|
|
|
/*
|
|
* Generate 24 testcases:
|
|
*/
|
|
#include "locking-selftest-spin-hardirq.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin)
|
|
|
|
#include "locking-selftest-rlock-hardirq.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock)
|
|
|
|
#include "locking-selftest-wlock-hardirq.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock)
|
|
|
|
#ifndef CONFIG_PREEMPT_RT
|
|
#include "locking-selftest-spin-softirq.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin)
|
|
|
|
#include "locking-selftest-rlock-softirq.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock)
|
|
|
|
#include "locking-selftest-wlock-softirq.h"
|
|
GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)
|
|
#endif
|
|
|
|
#undef E1
|
|
#undef E2
|
|
|
|
/*
|
|
* Acquiring a irq-unsafe lock while holding an irq-safe-lock:
|
|
*/
|
|
#define E1() \
|
|
\
|
|
LOCK(A); \
|
|
LOCK(B); \
|
|
UNLOCK(B); \
|
|
UNLOCK(A); \
|
|
|
|
#define E2() \
|
|
\
|
|
LOCK(B); \
|
|
UNLOCK(B);
|
|
|
|
#define E3() \
|
|
\
|
|
IRQ_ENTER(); \
|
|
LOCK(A); \
|
|
UNLOCK(A); \
|
|
IRQ_EXIT();
|
|
|
|
/*
|
|
* Generate 36 testcases:
|
|
*/
|
|
#include "locking-selftest-spin-hardirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin)
|
|
|
|
#include "locking-selftest-rlock-hardirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock)
|
|
|
|
#include "locking-selftest-wlock-hardirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock)
|
|
|
|
#ifndef CONFIG_PREEMPT_RT
|
|
#include "locking-selftest-spin-softirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin)
|
|
|
|
#include "locking-selftest-rlock-softirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock)
|
|
|
|
#include "locking-selftest-wlock-softirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)
|
|
#endif
|
|
|
|
#undef E1
|
|
#undef E2
|
|
#undef E3
|
|
|
|
/*
|
|
* If a lock turns into softirq-safe, but earlier it took
|
|
* a softirq-unsafe lock:
|
|
*/
|
|
|
|
#define E1() \
|
|
IRQ_DISABLE(); \
|
|
LOCK(A); \
|
|
LOCK(B); \
|
|
UNLOCK(B); \
|
|
UNLOCK(A); \
|
|
IRQ_ENABLE();
|
|
|
|
#define E2() \
|
|
LOCK(B); \
|
|
UNLOCK(B);
|
|
|
|
#define E3() \
|
|
IRQ_ENTER(); \
|
|
LOCK(A); \
|
|
UNLOCK(A); \
|
|
IRQ_EXIT();
|
|
|
|
/*
|
|
* Generate 36 testcases:
|
|
*/
|
|
#include "locking-selftest-spin-hardirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin)
|
|
|
|
#include "locking-selftest-rlock-hardirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock)
|
|
|
|
#include "locking-selftest-wlock-hardirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock)
|
|
|
|
#ifndef CONFIG_PREEMPT_RT
|
|
#include "locking-selftest-spin-softirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin)
|
|
|
|
#include "locking-selftest-rlock-softirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock)
|
|
|
|
#include "locking-selftest-wlock-softirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock)
|
|
#endif
|
|
|
|
#undef E1
|
|
#undef E2
|
|
#undef E3
|
|
|
|
/*
|
|
* read-lock / write-lock irq inversion.
|
|
*
|
|
* Deadlock scenario:
|
|
*
|
|
* CPU#1 is at #1, i.e. it has write-locked A, but has not
|
|
* taken B yet.
|
|
*
|
|
* CPU#2 is at #2, i.e. it has locked B.
|
|
*
|
|
* Hardirq hits CPU#2 at point #2 and is trying to read-lock A.
|
|
*
|
|
* The deadlock occurs because CPU#1 will spin on B, and CPU#2
|
|
* will spin on A.
|
|
*/
|
|
|
|
#define E1() \
|
|
\
|
|
IRQ_DISABLE(); \
|
|
WL(A); \
|
|
LOCK(B); \
|
|
UNLOCK(B); \
|
|
WU(A); \
|
|
IRQ_ENABLE();
|
|
|
|
#define E2() \
|
|
\
|
|
LOCK(B); \
|
|
UNLOCK(B);
|
|
|
|
#define E3() \
|
|
\
|
|
IRQ_ENTER(); \
|
|
RL(A); \
|
|
RU(A); \
|
|
IRQ_EXIT();
|
|
|
|
/*
|
|
* Generate 36 testcases:
|
|
*/
|
|
#include "locking-selftest-spin-hardirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin)
|
|
|
|
#include "locking-selftest-rlock-hardirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock)
|
|
|
|
#include "locking-selftest-wlock-hardirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock)
|
|
|
|
#ifndef CONFIG_PREEMPT_RT
|
|
#include "locking-selftest-spin-softirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin)
|
|
|
|
#include "locking-selftest-rlock-softirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock)
|
|
|
|
#include "locking-selftest-wlock-softirq.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock)
|
|
#endif
|
|
|
|
#undef E1
|
|
#undef E2
|
|
#undef E3
|
|
|
|
/*
|
|
* write-read / write-read / write-read deadlock even if read is recursive
|
|
*/
|
|
|
|
#define E1() \
|
|
\
|
|
WL(X1); \
|
|
RL(Y1); \
|
|
RU(Y1); \
|
|
WU(X1);
|
|
|
|
#define E2() \
|
|
\
|
|
WL(Y1); \
|
|
RL(Z1); \
|
|
RU(Z1); \
|
|
WU(Y1);
|
|
|
|
#define E3() \
|
|
\
|
|
WL(Z1); \
|
|
RL(X1); \
|
|
RU(X1); \
|
|
WU(Z1);
|
|
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(W1R2_W2R3_W3R1)
|
|
|
|
#undef E1
|
|
#undef E2
|
|
#undef E3
|
|
|
|
/*
|
|
* write-write / read-read / write-read deadlock even if read is recursive
|
|
*/
|
|
|
|
#define E1() \
|
|
\
|
|
WL(X1); \
|
|
WL(Y1); \
|
|
WU(Y1); \
|
|
WU(X1);
|
|
|
|
#define E2() \
|
|
\
|
|
RL(Y1); \
|
|
RL(Z1); \
|
|
RU(Z1); \
|
|
RU(Y1);
|
|
|
|
#define E3() \
|
|
\
|
|
WL(Z1); \
|
|
RL(X1); \
|
|
RU(X1); \
|
|
WU(Z1);
|
|
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_W3R1)
|
|
|
|
#undef E1
|
|
#undef E2
|
|
#undef E3
|
|
|
|
/*
|
|
* write-write / read-read / read-write is not deadlock when read is recursive
|
|
*/
|
|
|
|
#define E1() \
|
|
\
|
|
WL(X1); \
|
|
WL(Y1); \
|
|
WU(Y1); \
|
|
WU(X1);
|
|
|
|
#define E2() \
|
|
\
|
|
RL(Y1); \
|
|
RL(Z1); \
|
|
RU(Z1); \
|
|
RU(Y1);
|
|
|
|
#define E3() \
|
|
\
|
|
RL(Z1); \
|
|
WL(X1); \
|
|
WU(X1); \
|
|
RU(Z1);
|
|
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(W1R2_R2R3_W3W1)
|
|
|
|
#undef E1
|
|
#undef E2
|
|
#undef E3
|
|
|
|
/*
|
|
* write-read / read-read / write-write is not deadlock when read is recursive
|
|
*/
|
|
|
|
#define E1() \
|
|
\
|
|
WL(X1); \
|
|
RL(Y1); \
|
|
RU(Y1); \
|
|
WU(X1);
|
|
|
|
#define E2() \
|
|
\
|
|
RL(Y1); \
|
|
RL(Z1); \
|
|
RU(Z1); \
|
|
RU(Y1);
|
|
|
|
#define E3() \
|
|
\
|
|
WL(Z1); \
|
|
WL(X1); \
|
|
WU(X1); \
|
|
WU(Z1);
|
|
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_R3W1)
|
|
|
|
#undef E1
|
|
#undef E2
|
|
#undef E3
|
|
/*
|
|
* read-lock / write-lock recursion that is actually safe.
|
|
*/
|
|
|
|
#define E1() \
|
|
\
|
|
IRQ_DISABLE(); \
|
|
WL(A); \
|
|
WU(A); \
|
|
IRQ_ENABLE();
|
|
|
|
#define E2() \
|
|
\
|
|
RL(A); \
|
|
RU(A); \
|
|
|
|
#define E3() \
|
|
\
|
|
IRQ_ENTER(); \
|
|
LOCK(A); \
|
|
L(B); \
|
|
U(B); \
|
|
UNLOCK(A); \
|
|
IRQ_EXIT();
|
|
|
|
/*
|
|
* Generate 24 testcases:
|
|
*/
|
|
#include "locking-selftest-hardirq.h"
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_rlock)
|
|
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_wlock)
|
|
|
|
#ifndef CONFIG_PREEMPT_RT
|
|
#include "locking-selftest-softirq.h"
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_rlock)
|
|
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_wlock)
|
|
#endif
|
|
|
|
#undef E1
|
|
#undef E2
|
|
#undef E3
|
|
|
|
/*
|
|
* read-lock / write-lock recursion that is unsafe.
|
|
*/
|
|
|
|
#define E1() \
|
|
\
|
|
IRQ_DISABLE(); \
|
|
L(B); \
|
|
LOCK(A); \
|
|
UNLOCK(A); \
|
|
U(B); \
|
|
IRQ_ENABLE();
|
|
|
|
#define E2() \
|
|
\
|
|
RL(A); \
|
|
RU(A); \
|
|
|
|
#define E3() \
|
|
\
|
|
IRQ_ENTER(); \
|
|
L(B); \
|
|
U(B); \
|
|
IRQ_EXIT();
|
|
|
|
/*
|
|
* Generate 24 testcases:
|
|
*/
|
|
#include "locking-selftest-hardirq.h"
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_rlock)
|
|
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_wlock)
|
|
|
|
#ifndef CONFIG_PREEMPT_RT
|
|
#include "locking-selftest-softirq.h"
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_rlock)
|
|
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_wlock)
|
|
#endif
|
|
|
|
#undef E1
|
|
#undef E2
|
|
#undef E3
|
|
/*
|
|
* read-lock / write-lock recursion that is unsafe.
|
|
*
|
|
* A is a ENABLED_*_READ lock
|
|
* B is a USED_IN_*_READ lock
|
|
*
|
|
* read_lock(A);
|
|
* write_lock(B);
|
|
* <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)
|
|
|
|
#ifndef CONFIG_PREEMPT_RT
|
|
#include "locking-selftest-softirq.h"
|
|
#include "locking-selftest-rlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_rlock)
|
|
|
|
#include "locking-selftest-wlock.h"
|
|
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_wlock)
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
|
# define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map)
|
|
# define I_RAW_SPINLOCK(x) lockdep_reset_lock(&raw_lock_##x.dep_map)
|
|
# define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map)
|
|
# define I_MUTEX(x) lockdep_reset_lock(&mutex_##x.dep_map)
|
|
# define I_RWSEM(x) lockdep_reset_lock(&rwsem_##x.dep_map)
|
|
# define I_WW(x) lockdep_reset_lock(&x.dep_map)
|
|
# define I_LOCAL_LOCK(x) lockdep_reset_lock(this_cpu_ptr(&local_##x.dep_map))
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
# define I_RTMUTEX(x) lockdep_reset_lock(&rtmutex_##x.dep_map)
|
|
#endif
|
|
#else
|
|
# define I_SPINLOCK(x)
|
|
# define I_RAW_SPINLOCK(x)
|
|
# define I_RWLOCK(x)
|
|
# define I_MUTEX(x)
|
|
# define I_RWSEM(x)
|
|
# define I_WW(x)
|
|
# define I_LOCAL_LOCK(x)
|
|
#endif
|
|
|
|
#ifndef I_RTMUTEX
|
|
# define I_RTMUTEX(x)
|
|
#endif
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
#define I2_RTMUTEX(x) rt_mutex_init(&rtmutex_##x)
|
|
#else
|
|
#define I2_RTMUTEX(x)
|
|
#endif
|
|
|
|
#define I1(x) \
|
|
do { \
|
|
I_SPINLOCK(x); \
|
|
I_RWLOCK(x); \
|
|
I_MUTEX(x); \
|
|
I_RWSEM(x); \
|
|
I_RTMUTEX(x); \
|
|
} while (0)
|
|
|
|
#define I2(x) \
|
|
do { \
|
|
spin_lock_init(&lock_##x); \
|
|
rwlock_init(&rwlock_##x); \
|
|
mutex_init(&mutex_##x); \
|
|
init_rwsem(&rwsem_##x); \
|
|
I2_RTMUTEX(x); \
|
|
} while (0)
|
|
|
|
static void reset_locks(void)
|
|
{
|
|
local_irq_disable();
|
|
lockdep_free_key_range(&ww_lockdep.acquire_key, 1);
|
|
lockdep_free_key_range(&ww_lockdep.mutex_key, 1);
|
|
|
|
I1(A); I1(B); I1(C); I1(D);
|
|
I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2);
|
|
I_WW(t); I_WW(t2); I_WW(o.base); I_WW(o2.base); I_WW(o3.base);
|
|
I_RAW_SPINLOCK(A); I_RAW_SPINLOCK(B);
|
|
I_LOCAL_LOCK(A);
|
|
|
|
lockdep_reset();
|
|
|
|
I2(A); I2(B); I2(C); I2(D);
|
|
init_shared_classes();
|
|
raw_spin_lock_init(&raw_lock_A);
|
|
raw_spin_lock_init(&raw_lock_B);
|
|
local_lock_init(this_cpu_ptr(&local_A));
|
|
|
|
ww_mutex_init(&o, &ww_lockdep); ww_mutex_init(&o2, &ww_lockdep); ww_mutex_init(&o3, &ww_lockdep);
|
|
memset(&t, 0, sizeof(t)); memset(&t2, 0, sizeof(t2));
|
|
memset(&ww_lockdep.acquire_key, 0, sizeof(ww_lockdep.acquire_key));
|
|
memset(&ww_lockdep.mutex_key, 0, sizeof(ww_lockdep.mutex_key));
|
|
local_irq_enable();
|
|
}
|
|
|
|
#undef I
|
|
|
|
static int testcase_total;
|
|
static int testcase_successes;
|
|
static int expected_testcase_failures;
|
|
static int unexpected_testcase_failures;
|
|
|
|
static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
|
|
{
|
|
int saved_preempt_count = preempt_count();
|
|
#ifdef CONFIG_PREEMPT_RT
|
|
#ifdef CONFIG_SMP
|
|
int saved_mgd_count = current->migration_disabled;
|
|
#endif
|
|
int saved_rcu_count = current->rcu_read_lock_nesting;
|
|
#endif
|
|
|
|
WARN_ON(irqs_disabled());
|
|
|
|
debug_locks_silent = !(debug_locks_verbose & lockclass_mask);
|
|
|
|
testcase_fn();
|
|
/*
|
|
* Filter out expected failures:
|
|
*/
|
|
#ifndef CONFIG_PROVE_LOCKING
|
|
if (expected == FAILURE && debug_locks) {
|
|
expected_testcase_failures++;
|
|
pr_cont("failed|");
|
|
}
|
|
else
|
|
#endif
|
|
if (debug_locks != expected) {
|
|
unexpected_testcase_failures++;
|
|
pr_cont("FAILED|");
|
|
} else {
|
|
testcase_successes++;
|
|
pr_cont(" ok |");
|
|
}
|
|
testcase_total++;
|
|
|
|
if (debug_locks_verbose & lockclass_mask)
|
|
pr_cont(" lockclass mask: %x, debug_locks: %d, expected: %d\n",
|
|
lockclass_mask, debug_locks, expected);
|
|
/*
|
|
* Some tests (e.g. double-unlock) might corrupt the preemption
|
|
* count, so restore it:
|
|
*/
|
|
preempt_count_set(saved_preempt_count);
|
|
|
|
#ifdef CONFIG_PREEMPT_RT
|
|
#ifdef CONFIG_SMP
|
|
while (current->migration_disabled > saved_mgd_count)
|
|
migrate_enable();
|
|
#endif
|
|
|
|
while (current->rcu_read_lock_nesting > saved_rcu_count)
|
|
rcu_read_unlock();
|
|
WARN_ON_ONCE(current->rcu_read_lock_nesting < saved_rcu_count);
|
|
#endif
|
|
|
|
#ifdef CONFIG_TRACE_IRQFLAGS
|
|
if (softirq_count())
|
|
current->softirqs_enabled = 0;
|
|
else
|
|
current->softirqs_enabled = 1;
|
|
#endif
|
|
|
|
reset_locks();
|
|
}
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
#define dotest_rt(fn, e, m) dotest((fn), (e), (m))
|
|
#else
|
|
#define dotest_rt(fn, e, m)
|
|
#endif
|
|
|
|
static inline void print_testname(const char *testname)
|
|
{
|
|
printk("%33s:", testname);
|
|
}
|
|
|
|
#define DO_TESTCASE_1(desc, name, nr) \
|
|
print_testname(desc"/"#nr); \
|
|
dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
|
|
pr_cont("\n");
|
|
|
|
#define DO_TESTCASE_1B(desc, name, nr) \
|
|
print_testname(desc"/"#nr); \
|
|
dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
|
|
pr_cont("\n");
|
|
|
|
#define DO_TESTCASE_1RR(desc, name, nr) \
|
|
print_testname(desc"/"#nr); \
|
|
pr_cont(" |"); \
|
|
dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
|
|
pr_cont("\n");
|
|
|
|
#define DO_TESTCASE_1RRB(desc, name, nr) \
|
|
print_testname(desc"/"#nr); \
|
|
pr_cont(" |"); \
|
|
dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
|
|
pr_cont("\n");
|
|
|
|
|
|
#define DO_TESTCASE_3(desc, name, nr) \
|
|
print_testname(desc"/"#nr); \
|
|
dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \
|
|
dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
|
|
dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
|
|
pr_cont("\n");
|
|
|
|
#define DO_TESTCASE_3RW(desc, name, nr) \
|
|
print_testname(desc"/"#nr); \
|
|
dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\
|
|
dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
|
|
dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
|
|
pr_cont("\n");
|
|
|
|
#define DO_TESTCASE_2RW(desc, name, nr) \
|
|
print_testname(desc"/"#nr); \
|
|
pr_cont(" |"); \
|
|
dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
|
|
dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
|
|
pr_cont("\n");
|
|
|
|
#define DO_TESTCASE_2x2RW(desc, name, nr) \
|
|
DO_TESTCASE_2RW("hard-"desc, name##_hard, nr) \
|
|
NON_RT(DO_TESTCASE_2RW("soft-"desc, name##_soft, nr)) \
|
|
|
|
#define DO_TESTCASE_6x2x2RW(desc, name) \
|
|
DO_TESTCASE_2x2RW(desc, name, 123); \
|
|
DO_TESTCASE_2x2RW(desc, name, 132); \
|
|
DO_TESTCASE_2x2RW(desc, name, 213); \
|
|
DO_TESTCASE_2x2RW(desc, name, 231); \
|
|
DO_TESTCASE_2x2RW(desc, name, 312); \
|
|
DO_TESTCASE_2x2RW(desc, name, 321);
|
|
|
|
#define DO_TESTCASE_6(desc, name) \
|
|
print_testname(desc); \
|
|
dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \
|
|
dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \
|
|
dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK); \
|
|
dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \
|
|
dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \
|
|
dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \
|
|
dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \
|
|
pr_cont("\n");
|
|
|
|
#define DO_TESTCASE_6_SUCCESS(desc, name) \
|
|
print_testname(desc); \
|
|
dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN); \
|
|
dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK); \
|
|
dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \
|
|
dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX); \
|
|
dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM); \
|
|
dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM); \
|
|
dotest_rt(name##_rtmutex, SUCCESS, LOCKTYPE_RTMUTEX); \
|
|
pr_cont("\n");
|
|
|
|
/*
|
|
* 'read' variant: rlocks must not trigger.
|
|
*/
|
|
#define DO_TESTCASE_6R(desc, name) \
|
|
print_testname(desc); \
|
|
dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \
|
|
dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \
|
|
dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \
|
|
dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \
|
|
dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \
|
|
dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \
|
|
dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \
|
|
pr_cont("\n");
|
|
|
|
#define DO_TESTCASE_2I(desc, name, nr) \
|
|
DO_TESTCASE_1("hard-"desc, name##_hard, nr); \
|
|
NON_RT(DO_TESTCASE_1("soft-"desc, name##_soft, nr));
|
|
|
|
#define DO_TESTCASE_2IB(desc, name, nr) \
|
|
DO_TESTCASE_1B("hard-"desc, name##_hard, nr); \
|
|
NON_RT(DO_TESTCASE_1B("soft-"desc, name##_soft, nr));
|
|
|
|
#define DO_TESTCASE_6I(desc, name, nr) \
|
|
DO_TESTCASE_3("hard-"desc, name##_hard, nr); \
|
|
NON_RT(DO_TESTCASE_3("soft-"desc, name##_soft, nr));
|
|
|
|
#define DO_TESTCASE_6IRW(desc, name, nr) \
|
|
DO_TESTCASE_3RW("hard-"desc, name##_hard, nr); \
|
|
NON_RT(DO_TESTCASE_3RW("soft-"desc, name##_soft, nr));
|
|
|
|
#define DO_TESTCASE_2x3(desc, name) \
|
|
DO_TESTCASE_3(desc, name, 12); \
|
|
DO_TESTCASE_3(desc, name, 21);
|
|
|
|
#define DO_TESTCASE_2x6(desc, name) \
|
|
DO_TESTCASE_6I(desc, name, 12); \
|
|
DO_TESTCASE_6I(desc, name, 21);
|
|
|
|
#define DO_TESTCASE_6x2(desc, name) \
|
|
DO_TESTCASE_2I(desc, name, 123); \
|
|
DO_TESTCASE_2I(desc, name, 132); \
|
|
DO_TESTCASE_2I(desc, name, 213); \
|
|
DO_TESTCASE_2I(desc, name, 231); \
|
|
DO_TESTCASE_2I(desc, name, 312); \
|
|
DO_TESTCASE_2I(desc, name, 321);
|
|
|
|
#define DO_TESTCASE_6x2B(desc, name) \
|
|
DO_TESTCASE_2IB(desc, name, 123); \
|
|
DO_TESTCASE_2IB(desc, name, 132); \
|
|
DO_TESTCASE_2IB(desc, name, 213); \
|
|
DO_TESTCASE_2IB(desc, name, 231); \
|
|
DO_TESTCASE_2IB(desc, name, 312); \
|
|
DO_TESTCASE_2IB(desc, name, 321);
|
|
|
|
#define DO_TESTCASE_6x1RR(desc, name) \
|
|
DO_TESTCASE_1RR(desc, name, 123); \
|
|
DO_TESTCASE_1RR(desc, name, 132); \
|
|
DO_TESTCASE_1RR(desc, name, 213); \
|
|
DO_TESTCASE_1RR(desc, name, 231); \
|
|
DO_TESTCASE_1RR(desc, name, 312); \
|
|
DO_TESTCASE_1RR(desc, name, 321);
|
|
|
|
#define DO_TESTCASE_6x1RRB(desc, name) \
|
|
DO_TESTCASE_1RRB(desc, name, 123); \
|
|
DO_TESTCASE_1RRB(desc, name, 132); \
|
|
DO_TESTCASE_1RRB(desc, name, 213); \
|
|
DO_TESTCASE_1RRB(desc, name, 231); \
|
|
DO_TESTCASE_1RRB(desc, name, 312); \
|
|
DO_TESTCASE_1RRB(desc, name, 321);
|
|
|
|
#define DO_TESTCASE_6x6(desc, name) \
|
|
DO_TESTCASE_6I(desc, name, 123); \
|
|
DO_TESTCASE_6I(desc, name, 132); \
|
|
DO_TESTCASE_6I(desc, name, 213); \
|
|
DO_TESTCASE_6I(desc, name, 231); \
|
|
DO_TESTCASE_6I(desc, name, 312); \
|
|
DO_TESTCASE_6I(desc, name, 321);
|
|
|
|
#define DO_TESTCASE_6x6RW(desc, name) \
|
|
DO_TESTCASE_6IRW(desc, name, 123); \
|
|
DO_TESTCASE_6IRW(desc, name, 132); \
|
|
DO_TESTCASE_6IRW(desc, name, 213); \
|
|
DO_TESTCASE_6IRW(desc, name, 231); \
|
|
DO_TESTCASE_6IRW(desc, name, 312); \
|
|
DO_TESTCASE_6IRW(desc, name, 321);
|
|
|
|
static void ww_test_fail_acquire(void)
|
|
{
|
|
int ret;
|
|
|
|
WWAI(&t);
|
|
t.stamp++;
|
|
|
|
ret = WWL(&o, &t);
|
|
|
|
if (WARN_ON(!o.ctx) ||
|
|
WARN_ON(ret))
|
|
return;
|
|
|
|
/* No lockdep test, pure API */
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret != -EALREADY);
|
|
|
|
ret = WWT(&o);
|
|
WARN_ON(ret);
|
|
|
|
t2 = t;
|
|
t2.stamp++;
|
|
ret = WWL(&o, &t2);
|
|
WARN_ON(ret != -EDEADLK);
|
|
WWU(&o);
|
|
|
|
if (WWT(&o))
|
|
WWU(&o);
|
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
|
else
|
|
DEBUG_LOCKS_WARN_ON(1);
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_PREEMPT_RT
|
|
#define ww_mutex_base_lock(b) rt_mutex_lock(b)
|
|
#define ww_mutex_base_trylock(b) rt_mutex_trylock(b)
|
|
#define ww_mutex_base_lock_nest_lock(b, b2) rt_mutex_lock_nest_lock(b, b2)
|
|
#define ww_mutex_base_lock_interruptible(b) rt_mutex_lock_interruptible(b)
|
|
#define ww_mutex_base_lock_killable(b) rt_mutex_lock_killable(b)
|
|
#define ww_mutex_base_unlock(b) rt_mutex_unlock(b)
|
|
#else
|
|
#define ww_mutex_base_lock(b) mutex_lock(b)
|
|
#define ww_mutex_base_trylock(b) mutex_trylock(b)
|
|
#define ww_mutex_base_lock_nest_lock(b, b2) mutex_lock_nest_lock(b, b2)
|
|
#define ww_mutex_base_lock_interruptible(b) mutex_lock_interruptible(b)
|
|
#define ww_mutex_base_lock_killable(b) mutex_lock_killable(b)
|
|
#define ww_mutex_base_unlock(b) mutex_unlock(b)
|
|
#endif
|
|
|
|
static void ww_test_normal(void)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* None of the ww_mutex codepaths should be taken in the 'normal'
|
|
* mutex calls. The easiest way to verify this is by using the
|
|
* normal mutex calls, and making sure o.ctx is unmodified.
|
|
*/
|
|
|
|
/* mutex_lock (and indirectly, mutex_lock_nested) */
|
|
o.ctx = (void *)~0UL;
|
|
ww_mutex_base_lock(&o.base);
|
|
ww_mutex_base_unlock(&o.base);
|
|
WARN_ON(o.ctx != (void *)~0UL);
|
|
|
|
/* mutex_lock_interruptible (and *_nested) */
|
|
o.ctx = (void *)~0UL;
|
|
ret = ww_mutex_base_lock_interruptible(&o.base);
|
|
if (!ret)
|
|
ww_mutex_base_unlock(&o.base);
|
|
else
|
|
WARN_ON(1);
|
|
WARN_ON(o.ctx != (void *)~0UL);
|
|
|
|
/* mutex_lock_killable (and *_nested) */
|
|
o.ctx = (void *)~0UL;
|
|
ret = ww_mutex_base_lock_killable(&o.base);
|
|
if (!ret)
|
|
ww_mutex_base_unlock(&o.base);
|
|
else
|
|
WARN_ON(1);
|
|
WARN_ON(o.ctx != (void *)~0UL);
|
|
|
|
/* trylock, succeeding */
|
|
o.ctx = (void *)~0UL;
|
|
ret = ww_mutex_base_trylock(&o.base);
|
|
WARN_ON(!ret);
|
|
if (ret)
|
|
ww_mutex_base_unlock(&o.base);
|
|
else
|
|
WARN_ON(1);
|
|
WARN_ON(o.ctx != (void *)~0UL);
|
|
|
|
/* trylock, failing */
|
|
o.ctx = (void *)~0UL;
|
|
ww_mutex_base_lock(&o.base);
|
|
ret = ww_mutex_base_trylock(&o.base);
|
|
WARN_ON(ret);
|
|
ww_mutex_base_unlock(&o.base);
|
|
WARN_ON(o.ctx != (void *)~0UL);
|
|
|
|
WWAI(&t);
|
|
|
|
/* nest_lock */
|
|
o.ctx = (void *)~0UL;
|
|
ww_mutex_base_lock_nest_lock(&o.base, &t);
|
|
ww_mutex_base_unlock(&o.base);
|
|
WARN_ON(o.ctx != (void *)~0UL);
|
|
}
|
|
|
|
static void ww_test_two_contexts(void)
|
|
{
|
|
WWAI(&t);
|
|
WWAI(&t2);
|
|
}
|
|
|
|
static void ww_test_diff_class(void)
|
|
{
|
|
WWAI(&t);
|
|
#ifdef DEBUG_WW_MUTEXES
|
|
t.ww_class = NULL;
|
|
#endif
|
|
WWL(&o, &t);
|
|
}
|
|
|
|
static void ww_test_context_done_twice(void)
|
|
{
|
|
WWAI(&t);
|
|
WWAD(&t);
|
|
WWAD(&t);
|
|
WWAF(&t);
|
|
}
|
|
|
|
static void ww_test_context_unlock_twice(void)
|
|
{
|
|
WWAI(&t);
|
|
WWAD(&t);
|
|
WWAF(&t);
|
|
WWAF(&t);
|
|
}
|
|
|
|
static void ww_test_context_fini_early(void)
|
|
{
|
|
WWAI(&t);
|
|
WWL(&o, &t);
|
|
WWAD(&t);
|
|
WWAF(&t);
|
|
}
|
|
|
|
static void ww_test_context_lock_after_done(void)
|
|
{
|
|
WWAI(&t);
|
|
WWAD(&t);
|
|
WWL(&o, &t);
|
|
}
|
|
|
|
static void ww_test_object_unlock_twice(void)
|
|
{
|
|
WWL1(&o);
|
|
WWU(&o);
|
|
WWU(&o);
|
|
}
|
|
|
|
static void ww_test_object_lock_unbalanced(void)
|
|
{
|
|
WWAI(&t);
|
|
WWL(&o, &t);
|
|
t.acquired = 0;
|
|
WWU(&o);
|
|
WWAF(&t);
|
|
}
|
|
|
|
static void ww_test_object_lock_stale_context(void)
|
|
{
|
|
WWAI(&t);
|
|
o.ctx = &t2;
|
|
WWL(&o, &t);
|
|
}
|
|
|
|
static void ww_test_edeadlk_normal(void)
|
|
{
|
|
int ret;
|
|
|
|
ww_mutex_base_lock(&o2.base);
|
|
o2.ctx = &t2;
|
|
mutex_release(&o2.base.dep_map, _THIS_IP_);
|
|
|
|
WWAI(&t);
|
|
t2 = t;
|
|
t2.stamp--;
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
|
|
ret = WWL(&o2, &t);
|
|
WARN_ON(ret != -EDEADLK);
|
|
|
|
o2.ctx = NULL;
|
|
mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
|
|
ww_mutex_base_unlock(&o2.base);
|
|
WWU(&o);
|
|
|
|
WWL(&o2, &t);
|
|
}
|
|
|
|
static void ww_test_edeadlk_normal_slow(void)
|
|
{
|
|
int ret;
|
|
|
|
ww_mutex_base_lock(&o2.base);
|
|
mutex_release(&o2.base.dep_map, _THIS_IP_);
|
|
o2.ctx = &t2;
|
|
|
|
WWAI(&t);
|
|
t2 = t;
|
|
t2.stamp--;
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
|
|
ret = WWL(&o2, &t);
|
|
WARN_ON(ret != -EDEADLK);
|
|
|
|
o2.ctx = NULL;
|
|
mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
|
|
ww_mutex_base_unlock(&o2.base);
|
|
WWU(&o);
|
|
|
|
ww_mutex_lock_slow(&o2, &t);
|
|
}
|
|
|
|
static void ww_test_edeadlk_no_unlock(void)
|
|
{
|
|
int ret;
|
|
|
|
ww_mutex_base_lock(&o2.base);
|
|
o2.ctx = &t2;
|
|
mutex_release(&o2.base.dep_map, _THIS_IP_);
|
|
|
|
WWAI(&t);
|
|
t2 = t;
|
|
t2.stamp--;
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
|
|
ret = WWL(&o2, &t);
|
|
WARN_ON(ret != -EDEADLK);
|
|
|
|
o2.ctx = NULL;
|
|
mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
|
|
ww_mutex_base_unlock(&o2.base);
|
|
|
|
WWL(&o2, &t);
|
|
}
|
|
|
|
static void ww_test_edeadlk_no_unlock_slow(void)
|
|
{
|
|
int ret;
|
|
|
|
ww_mutex_base_lock(&o2.base);
|
|
mutex_release(&o2.base.dep_map, _THIS_IP_);
|
|
o2.ctx = &t2;
|
|
|
|
WWAI(&t);
|
|
t2 = t;
|
|
t2.stamp--;
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
|
|
ret = WWL(&o2, &t);
|
|
WARN_ON(ret != -EDEADLK);
|
|
|
|
o2.ctx = NULL;
|
|
mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
|
|
ww_mutex_base_unlock(&o2.base);
|
|
|
|
ww_mutex_lock_slow(&o2, &t);
|
|
}
|
|
|
|
static void ww_test_edeadlk_acquire_more(void)
|
|
{
|
|
int ret;
|
|
|
|
ww_mutex_base_lock(&o2.base);
|
|
mutex_release(&o2.base.dep_map, _THIS_IP_);
|
|
o2.ctx = &t2;
|
|
|
|
WWAI(&t);
|
|
t2 = t;
|
|
t2.stamp--;
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
|
|
ret = WWL(&o2, &t);
|
|
WARN_ON(ret != -EDEADLK);
|
|
|
|
ret = WWL(&o3, &t);
|
|
}
|
|
|
|
static void ww_test_edeadlk_acquire_more_slow(void)
|
|
{
|
|
int ret;
|
|
|
|
ww_mutex_base_lock(&o2.base);
|
|
mutex_release(&o2.base.dep_map, _THIS_IP_);
|
|
o2.ctx = &t2;
|
|
|
|
WWAI(&t);
|
|
t2 = t;
|
|
t2.stamp--;
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
|
|
ret = WWL(&o2, &t);
|
|
WARN_ON(ret != -EDEADLK);
|
|
|
|
ww_mutex_lock_slow(&o3, &t);
|
|
}
|
|
|
|
static void ww_test_edeadlk_acquire_more_edeadlk(void)
|
|
{
|
|
int ret;
|
|
|
|
ww_mutex_base_lock(&o2.base);
|
|
mutex_release(&o2.base.dep_map, _THIS_IP_);
|
|
o2.ctx = &t2;
|
|
|
|
ww_mutex_base_lock(&o3.base);
|
|
mutex_release(&o3.base.dep_map, _THIS_IP_);
|
|
o3.ctx = &t2;
|
|
|
|
WWAI(&t);
|
|
t2 = t;
|
|
t2.stamp--;
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
|
|
ret = WWL(&o2, &t);
|
|
WARN_ON(ret != -EDEADLK);
|
|
|
|
ret = WWL(&o3, &t);
|
|
WARN_ON(ret != -EDEADLK);
|
|
}
|
|
|
|
static void ww_test_edeadlk_acquire_more_edeadlk_slow(void)
|
|
{
|
|
int ret;
|
|
|
|
ww_mutex_base_lock(&o2.base);
|
|
mutex_release(&o2.base.dep_map, _THIS_IP_);
|
|
o2.ctx = &t2;
|
|
|
|
ww_mutex_base_lock(&o3.base);
|
|
mutex_release(&o3.base.dep_map, _THIS_IP_);
|
|
o3.ctx = &t2;
|
|
|
|
WWAI(&t);
|
|
t2 = t;
|
|
t2.stamp--;
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
|
|
ret = WWL(&o2, &t);
|
|
WARN_ON(ret != -EDEADLK);
|
|
|
|
ww_mutex_lock_slow(&o3, &t);
|
|
}
|
|
|
|
static void ww_test_edeadlk_acquire_wrong(void)
|
|
{
|
|
int ret;
|
|
|
|
ww_mutex_base_lock(&o2.base);
|
|
mutex_release(&o2.base.dep_map, _THIS_IP_);
|
|
o2.ctx = &t2;
|
|
|
|
WWAI(&t);
|
|
t2 = t;
|
|
t2.stamp--;
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
|
|
ret = WWL(&o2, &t);
|
|
WARN_ON(ret != -EDEADLK);
|
|
if (!ret)
|
|
WWU(&o2);
|
|
|
|
WWU(&o);
|
|
|
|
ret = WWL(&o3, &t);
|
|
}
|
|
|
|
static void ww_test_edeadlk_acquire_wrong_slow(void)
|
|
{
|
|
int ret;
|
|
|
|
ww_mutex_base_lock(&o2.base);
|
|
mutex_release(&o2.base.dep_map, _THIS_IP_);
|
|
o2.ctx = &t2;
|
|
|
|
WWAI(&t);
|
|
t2 = t;
|
|
t2.stamp--;
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
|
|
ret = WWL(&o2, &t);
|
|
WARN_ON(ret != -EDEADLK);
|
|
if (!ret)
|
|
WWU(&o2);
|
|
|
|
WWU(&o);
|
|
|
|
ww_mutex_lock_slow(&o3, &t);
|
|
}
|
|
|
|
static void ww_test_spin_nest_unlocked(void)
|
|
{
|
|
spin_lock_nest_lock(&lock_A, &o.base);
|
|
U(A);
|
|
}
|
|
|
|
/* This is not a deadlock, because we have X1 to serialize Y1 and Y2 */
|
|
static void ww_test_spin_nest_lock(void)
|
|
{
|
|
spin_lock(&lock_X1);
|
|
spin_lock_nest_lock(&lock_Y1, &lock_X1);
|
|
spin_lock(&lock_A);
|
|
spin_lock_nest_lock(&lock_Y2, &lock_X1);
|
|
spin_unlock(&lock_A);
|
|
spin_unlock(&lock_Y2);
|
|
spin_unlock(&lock_Y1);
|
|
spin_unlock(&lock_X1);
|
|
}
|
|
|
|
static void ww_test_unneeded_slow(void)
|
|
{
|
|
WWAI(&t);
|
|
|
|
ww_mutex_lock_slow(&o, &t);
|
|
}
|
|
|
|
static void ww_test_context_block(void)
|
|
{
|
|
int ret;
|
|
|
|
WWAI(&t);
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
WWL1(&o2);
|
|
}
|
|
|
|
static void ww_test_context_try(void)
|
|
{
|
|
int ret;
|
|
|
|
WWAI(&t);
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
|
|
ret = WWT(&o2);
|
|
WARN_ON(!ret);
|
|
WWU(&o2);
|
|
WWU(&o);
|
|
}
|
|
|
|
static void ww_test_context_context(void)
|
|
{
|
|
int ret;
|
|
|
|
WWAI(&t);
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
|
|
ret = WWL(&o2, &t);
|
|
WARN_ON(ret);
|
|
|
|
WWU(&o2);
|
|
WWU(&o);
|
|
}
|
|
|
|
static void ww_test_try_block(void)
|
|
{
|
|
bool ret;
|
|
|
|
ret = WWT(&o);
|
|
WARN_ON(!ret);
|
|
|
|
WWL1(&o2);
|
|
WWU(&o2);
|
|
WWU(&o);
|
|
}
|
|
|
|
static void ww_test_try_try(void)
|
|
{
|
|
bool ret;
|
|
|
|
ret = WWT(&o);
|
|
WARN_ON(!ret);
|
|
ret = WWT(&o2);
|
|
WARN_ON(!ret);
|
|
WWU(&o2);
|
|
WWU(&o);
|
|
}
|
|
|
|
static void ww_test_try_context(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = WWT(&o);
|
|
WARN_ON(!ret);
|
|
|
|
WWAI(&t);
|
|
|
|
ret = WWL(&o2, &t);
|
|
WARN_ON(ret);
|
|
}
|
|
|
|
static void ww_test_block_block(void)
|
|
{
|
|
WWL1(&o);
|
|
WWL1(&o2);
|
|
}
|
|
|
|
static void ww_test_block_try(void)
|
|
{
|
|
bool ret;
|
|
|
|
WWL1(&o);
|
|
ret = WWT(&o2);
|
|
WARN_ON(!ret);
|
|
}
|
|
|
|
static void ww_test_block_context(void)
|
|
{
|
|
int ret;
|
|
|
|
WWL1(&o);
|
|
WWAI(&t);
|
|
|
|
ret = WWL(&o2, &t);
|
|
WARN_ON(ret);
|
|
}
|
|
|
|
static void ww_test_spin_block(void)
|
|
{
|
|
L(A);
|
|
U(A);
|
|
|
|
WWL1(&o);
|
|
L(A);
|
|
U(A);
|
|
WWU(&o);
|
|
|
|
L(A);
|
|
WWL1(&o);
|
|
WWU(&o);
|
|
U(A);
|
|
}
|
|
|
|
static void ww_test_spin_try(void)
|
|
{
|
|
bool ret;
|
|
|
|
L(A);
|
|
U(A);
|
|
|
|
ret = WWT(&o);
|
|
WARN_ON(!ret);
|
|
L(A);
|
|
U(A);
|
|
WWU(&o);
|
|
|
|
L(A);
|
|
ret = WWT(&o);
|
|
WARN_ON(!ret);
|
|
WWU(&o);
|
|
U(A);
|
|
}
|
|
|
|
static void ww_test_spin_context(void)
|
|
{
|
|
int ret;
|
|
|
|
L(A);
|
|
U(A);
|
|
|
|
WWAI(&t);
|
|
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
L(A);
|
|
U(A);
|
|
WWU(&o);
|
|
|
|
L(A);
|
|
ret = WWL(&o, &t);
|
|
WARN_ON(ret);
|
|
WWU(&o);
|
|
U(A);
|
|
}
|
|
|
|
static void ww_tests(void)
|
|
{
|
|
printk(" --------------------------------------------------------------------------\n");
|
|
printk(" | Wound/wait tests |\n");
|
|
printk(" ---------------------\n");
|
|
|
|
print_testname("ww api failures");
|
|
dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW);
|
|
dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW);
|
|
dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW);
|
|
pr_cont("\n");
|
|
|
|
print_testname("ww contexts mixing");
|
|
dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW);
|
|
pr_cont("\n");
|
|
|
|
print_testname("finishing ww context");
|
|
dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW);
|
|
pr_cont("\n");
|
|
|
|
print_testname("locking mismatches");
|
|
dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW);
|
|
pr_cont("\n");
|
|
|
|
print_testname("EDEADLK handling");
|
|
dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW);
|
|
dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW);
|
|
dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW);
|
|
pr_cont("\n");
|
|
|
|
print_testname("spinlock nest unlocked");
|
|
dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW);
|
|
pr_cont("\n");
|
|
|
|
print_testname("spinlock nest test");
|
|
dotest(ww_test_spin_nest_lock, SUCCESS, LOCKTYPE_WW);
|
|
pr_cont("\n");
|
|
|
|
printk(" -----------------------------------------------------\n");
|
|
printk(" |block | try |context|\n");
|
|
printk(" -----------------------------------------------------\n");
|
|
|
|
print_testname("context");
|
|
dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW);
|
|
dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW);
|
|
pr_cont("\n");
|
|
|
|
print_testname("try");
|
|
dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW);
|
|
dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW);
|
|
pr_cont("\n");
|
|
|
|
print_testname("block");
|
|
dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW);
|
|
dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW);
|
|
pr_cont("\n");
|
|
|
|
print_testname("spinlock");
|
|
dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW);
|
|
dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW);
|
|
dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW);
|
|
pr_cont("\n");
|
|
}
|
|
|
|
|
|
/*
|
|
* <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");
|
|
}
|
|
|
|
/* Defines guard classes to create contexts */
|
|
DEFINE_LOCK_GUARD_0(HARDIRQ, HARDIRQ_ENTER(), HARDIRQ_EXIT())
|
|
DEFINE_LOCK_GUARD_0(NOTTHREADED_HARDIRQ,
|
|
do {
|
|
local_irq_disable();
|
|
__irq_enter();
|
|
WARN_ON(!in_irq());
|
|
} while(0), HARDIRQ_EXIT())
|
|
DEFINE_LOCK_GUARD_0(SOFTIRQ, SOFTIRQ_ENTER(), SOFTIRQ_EXIT())
|
|
|
|
/* Define RCU guards, should go away when RCU has its own guard definitions */
|
|
DEFINE_LOCK_GUARD_0(RCU, rcu_read_lock(), rcu_read_unlock())
|
|
DEFINE_LOCK_GUARD_0(RCU_BH, rcu_read_lock_bh(), rcu_read_unlock_bh())
|
|
DEFINE_LOCK_GUARD_0(RCU_SCHED, rcu_read_lock_sched(), rcu_read_unlock_sched())
|
|
|
|
|
|
#define GENERATE_2_CONTEXT_TESTCASE(outer, outer_lock, inner, inner_lock) \
|
|
\
|
|
static void __maybe_unused inner##_in_##outer(void) \
|
|
{ \
|
|
/* Relies the reversed clean-up ordering: inner first */ \
|
|
guard(outer)(outer_lock); \
|
|
guard(inner)(inner_lock); \
|
|
}
|
|
|
|
/*
|
|
* wait contexts (considering PREEMPT_RT)
|
|
*
|
|
* o: inner is allowed in outer
|
|
* x: inner is disallowed in outer
|
|
*
|
|
* \ inner | RCU | RAW_SPIN | SPIN | MUTEX
|
|
* outer \ | | | |
|
|
* ---------------+-------+----------+------+-------
|
|
* HARDIRQ | o | o | o | x
|
|
* ---------------+-------+----------+------+-------
|
|
* NOTTHREADED_IRQ| o | o | x | x
|
|
* ---------------+-------+----------+------+-------
|
|
* SOFTIRQ | o | o | o | x
|
|
* ---------------+-------+----------+------+-------
|
|
* RCU | o | o | o | x
|
|
* ---------------+-------+----------+------+-------
|
|
* RCU_BH | o | o | o | x
|
|
* ---------------+-------+----------+------+-------
|
|
* RCU_SCHED | o | o | x | x
|
|
* ---------------+-------+----------+------+-------
|
|
* RAW_SPIN | o | o | x | x
|
|
* ---------------+-------+----------+------+-------
|
|
* SPIN | o | o | o | x
|
|
* ---------------+-------+----------+------+-------
|
|
* MUTEX | o | o | o | o
|
|
* ---------------+-------+----------+------+-------
|
|
*/
|
|
|
|
#define GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(inner, inner_lock) \
|
|
GENERATE_2_CONTEXT_TESTCASE(HARDIRQ, , inner, inner_lock) \
|
|
GENERATE_2_CONTEXT_TESTCASE(NOTTHREADED_HARDIRQ, , inner, inner_lock) \
|
|
GENERATE_2_CONTEXT_TESTCASE(SOFTIRQ, , inner, inner_lock) \
|
|
GENERATE_2_CONTEXT_TESTCASE(RCU, , inner, inner_lock) \
|
|
GENERATE_2_CONTEXT_TESTCASE(RCU_BH, , inner, inner_lock) \
|
|
GENERATE_2_CONTEXT_TESTCASE(RCU_SCHED, , inner, inner_lock) \
|
|
GENERATE_2_CONTEXT_TESTCASE(raw_spinlock, &raw_lock_A, inner, inner_lock) \
|
|
GENERATE_2_CONTEXT_TESTCASE(spinlock, &lock_A, inner, inner_lock) \
|
|
GENERATE_2_CONTEXT_TESTCASE(mutex, &mutex_A, inner, inner_lock)
|
|
|
|
GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RCU, )
|
|
GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(raw_spinlock, &raw_lock_B)
|
|
GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(spinlock, &lock_B)
|
|
GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(mutex, &mutex_B)
|
|
|
|
/* the outer context allows all kinds of preemption */
|
|
#define DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(outer) \
|
|
dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \
|
|
dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
|
|
dotest(spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
|
|
dotest(mutex_in_##outer, SUCCESS, LOCKTYPE_MUTEX); \
|
|
|
|
/*
|
|
* the outer context only allows the preemption introduced by spinlock_t (which
|
|
* is a sleepable lock for PREEMPT_RT)
|
|
*/
|
|
#define DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(outer) \
|
|
dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \
|
|
dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
|
|
dotest(spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
|
|
dotest(mutex_in_##outer, FAILURE, LOCKTYPE_MUTEX); \
|
|
|
|
/* the outer doesn't allows any kind of preemption */
|
|
#define DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(outer) \
|
|
dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \
|
|
dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
|
|
dotest(spinlock_in_##outer, FAILURE, LOCKTYPE_SPIN); \
|
|
dotest(mutex_in_##outer, FAILURE, LOCKTYPE_MUTEX); \
|
|
|
|
static void wait_context_tests(void)
|
|
{
|
|
printk(" --------------------------------------------------------------------------\n");
|
|
printk(" | wait context tests |\n");
|
|
printk(" --------------------------------------------------------------------------\n");
|
|
printk(" | rcu | raw | spin |mutex |\n");
|
|
printk(" --------------------------------------------------------------------------\n");
|
|
print_testname("in hardirq context");
|
|
DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(HARDIRQ);
|
|
pr_cont("\n");
|
|
|
|
print_testname("in hardirq context (not threaded)");
|
|
DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(NOTTHREADED_HARDIRQ);
|
|
pr_cont("\n");
|
|
|
|
print_testname("in softirq context");
|
|
DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SOFTIRQ);
|
|
pr_cont("\n");
|
|
|
|
print_testname("in RCU context");
|
|
DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU);
|
|
pr_cont("\n");
|
|
|
|
print_testname("in RCU-bh context");
|
|
DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU_BH);
|
|
pr_cont("\n");
|
|
|
|
print_testname("in RCU-sched context");
|
|
DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RCU_SCHED);
|
|
pr_cont("\n");
|
|
|
|
print_testname("in RAW_SPINLOCK context");
|
|
DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(raw_spinlock);
|
|
pr_cont("\n");
|
|
|
|
print_testname("in SPINLOCK context");
|
|
DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(spinlock);
|
|
pr_cont("\n");
|
|
|
|
print_testname("in MUTEX context");
|
|
DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(mutex);
|
|
pr_cont("\n");
|
|
}
|
|
|
|
static void local_lock_2(void)
|
|
{
|
|
local_lock(&local_A); /* IRQ-ON */
|
|
local_unlock(&local_A);
|
|
|
|
HARDIRQ_ENTER();
|
|
spin_lock(&lock_A); /* IN-IRQ */
|
|
spin_unlock(&lock_A);
|
|
HARDIRQ_EXIT()
|
|
|
|
HARDIRQ_DISABLE();
|
|
spin_lock(&lock_A);
|
|
local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle, false */
|
|
local_unlock(&local_A);
|
|
spin_unlock(&lock_A);
|
|
HARDIRQ_ENABLE();
|
|
}
|
|
|
|
static void local_lock_3A(void)
|
|
{
|
|
local_lock(&local_A); /* IRQ-ON */
|
|
spin_lock(&lock_B); /* IRQ-ON */
|
|
spin_unlock(&lock_B);
|
|
local_unlock(&local_A);
|
|
|
|
HARDIRQ_ENTER();
|
|
spin_lock(&lock_A); /* IN-IRQ */
|
|
spin_unlock(&lock_A);
|
|
HARDIRQ_EXIT()
|
|
|
|
HARDIRQ_DISABLE();
|
|
spin_lock(&lock_A);
|
|
local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
|
|
local_unlock(&local_A);
|
|
spin_unlock(&lock_A);
|
|
HARDIRQ_ENABLE();
|
|
}
|
|
|
|
static void local_lock_3B(void)
|
|
{
|
|
local_lock(&local_A); /* IRQ-ON */
|
|
spin_lock(&lock_B); /* IRQ-ON */
|
|
spin_unlock(&lock_B);
|
|
local_unlock(&local_A);
|
|
|
|
HARDIRQ_ENTER();
|
|
spin_lock(&lock_A); /* IN-IRQ */
|
|
spin_unlock(&lock_A);
|
|
HARDIRQ_EXIT()
|
|
|
|
HARDIRQ_DISABLE();
|
|
spin_lock(&lock_A);
|
|
local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
|
|
local_unlock(&local_A);
|
|
spin_unlock(&lock_A);
|
|
HARDIRQ_ENABLE();
|
|
|
|
HARDIRQ_DISABLE();
|
|
spin_lock(&lock_A);
|
|
spin_lock(&lock_B); /* IN-IRQ <-> IRQ-ON cycle, true */
|
|
spin_unlock(&lock_B);
|
|
spin_unlock(&lock_A);
|
|
HARDIRQ_DISABLE();
|
|
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
|
static inline const char *rw_semaphore_lockdep_name(struct rw_semaphore *rwsem)
|
|
{
|
|
return rwsem->dep_map.name;
|
|
}
|
|
#else
|
|
static inline const char *rw_semaphore_lockdep_name(struct rw_semaphore *rwsem)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
static void test_lockdep_set_subclass_name(void)
|
|
{
|
|
const char *name_before = rw_semaphore_lockdep_name(&rwsem_X1);
|
|
const char *name_after;
|
|
|
|
lockdep_set_subclass(&rwsem_X1, 1);
|
|
name_after = rw_semaphore_lockdep_name(&rwsem_X1);
|
|
DEBUG_LOCKS_WARN_ON(name_before != name_after);
|
|
}
|
|
|
|
/*
|
|
* lockdep_set_subclass() should reuse the existing lock class name instead
|
|
* of creating a new one.
|
|
*/
|
|
static void lockdep_set_subclass_name_test(void)
|
|
{
|
|
printk(" --------------------------------------------------------------------------\n");
|
|
printk(" | lockdep_set_subclass() name test|\n");
|
|
printk(" -----------------------------------\n");
|
|
|
|
print_testname("compare name before and after");
|
|
dotest(test_lockdep_set_subclass_name, SUCCESS, LOCKTYPE_RWSEM);
|
|
pr_cont("\n");
|
|
}
|
|
|
|
static void local_lock_tests(void)
|
|
{
|
|
printk(" --------------------------------------------------------------------------\n");
|
|
printk(" | local_lock tests |\n");
|
|
printk(" ---------------------\n");
|
|
|
|
print_testname("local_lock inversion 2");
|
|
dotest(local_lock_2, SUCCESS, LOCKTYPE_LL);
|
|
pr_cont("\n");
|
|
|
|
print_testname("local_lock inversion 3A");
|
|
dotest(local_lock_3A, SUCCESS, LOCKTYPE_LL);
|
|
pr_cont("\n");
|
|
|
|
print_testname("local_lock inversion 3B");
|
|
dotest(local_lock_3B, FAILURE, LOCKTYPE_LL);
|
|
pr_cont("\n");
|
|
}
|
|
|
|
static void hardirq_deadlock_softirq_not_deadlock(void)
|
|
{
|
|
/* mutex_A is hardirq-unsafe and softirq-unsafe */
|
|
/* mutex_A -> lock_C */
|
|
mutex_lock(&mutex_A);
|
|
HARDIRQ_DISABLE();
|
|
spin_lock(&lock_C);
|
|
spin_unlock(&lock_C);
|
|
HARDIRQ_ENABLE();
|
|
mutex_unlock(&mutex_A);
|
|
|
|
/* lock_A is hardirq-safe */
|
|
HARDIRQ_ENTER();
|
|
spin_lock(&lock_A);
|
|
spin_unlock(&lock_A);
|
|
HARDIRQ_EXIT();
|
|
|
|
/* lock_A -> lock_B */
|
|
HARDIRQ_DISABLE();
|
|
spin_lock(&lock_A);
|
|
spin_lock(&lock_B);
|
|
spin_unlock(&lock_B);
|
|
spin_unlock(&lock_A);
|
|
HARDIRQ_ENABLE();
|
|
|
|
/* lock_B -> lock_C */
|
|
HARDIRQ_DISABLE();
|
|
spin_lock(&lock_B);
|
|
spin_lock(&lock_C);
|
|
spin_unlock(&lock_C);
|
|
spin_unlock(&lock_B);
|
|
HARDIRQ_ENABLE();
|
|
|
|
/* lock_D is softirq-safe */
|
|
SOFTIRQ_ENTER();
|
|
spin_lock(&lock_D);
|
|
spin_unlock(&lock_D);
|
|
SOFTIRQ_EXIT();
|
|
|
|
/* And lock_D is hardirq-unsafe */
|
|
SOFTIRQ_DISABLE();
|
|
spin_lock(&lock_D);
|
|
spin_unlock(&lock_D);
|
|
SOFTIRQ_ENABLE();
|
|
|
|
/*
|
|
* mutex_A -> lock_C -> lock_D is softirq-unsafe -> softirq-safe, not
|
|
* deadlock.
|
|
*
|
|
* lock_A -> lock_B -> lock_C -> lock_D is hardirq-safe ->
|
|
* hardirq-unsafe, deadlock.
|
|
*/
|
|
HARDIRQ_DISABLE();
|
|
spin_lock(&lock_C);
|
|
spin_lock(&lock_D);
|
|
spin_unlock(&lock_D);
|
|
spin_unlock(&lock_C);
|
|
HARDIRQ_ENABLE();
|
|
}
|
|
|
|
void locking_selftest(void)
|
|
{
|
|
/*
|
|
* Got a locking failure before the selftest ran?
|
|
*/
|
|
if (!debug_locks) {
|
|
printk("----------------------------------\n");
|
|
printk("| Locking API testsuite disabled |\n");
|
|
printk("----------------------------------\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* treats read_lock() as recursive read locks for testing purpose
|
|
*/
|
|
force_read_lock_recursive = 1;
|
|
|
|
/*
|
|
* Run the testsuite:
|
|
*/
|
|
printk("------------------------\n");
|
|
printk("| Locking API testsuite:\n");
|
|
printk("----------------------------------------------------------------------------\n");
|
|
printk(" | spin |wlock |rlock |mutex | wsem | rsem |rtmutex\n");
|
|
printk(" --------------------------------------------------------------------------\n");
|
|
|
|
init_shared_classes();
|
|
lockdep_set_selftest_task(current);
|
|
|
|
DO_TESTCASE_6R("A-A deadlock", AA);
|
|
DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
|
|
DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA);
|
|
DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC);
|
|
DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA);
|
|
DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA);
|
|
DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA);
|
|
DO_TESTCASE_6("double unlock", double_unlock);
|
|
DO_TESTCASE_6("initialize held", init_held);
|
|
|
|
printk(" --------------------------------------------------------------------------\n");
|
|
print_testname("recursive read-lock");
|
|
pr_cont(" |");
|
|
dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
|
|
pr_cont(" |");
|
|
dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
|
|
pr_cont("\n");
|
|
|
|
print_testname("recursive read-lock #2");
|
|
pr_cont(" |");
|
|
dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK);
|
|
pr_cont(" |");
|
|
dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
|
|
pr_cont("\n");
|
|
|
|
print_testname("mixed read-write-lock");
|
|
pr_cont(" |");
|
|
dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK);
|
|
pr_cont(" |");
|
|
dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM);
|
|
pr_cont("\n");
|
|
|
|
print_testname("mixed write-read-lock");
|
|
pr_cont(" |");
|
|
dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK);
|
|
pr_cont(" |");
|
|
dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
|
|
pr_cont("\n");
|
|
|
|
print_testname("mixed read-lock/lock-write ABBA");
|
|
pr_cont(" |");
|
|
dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
|
|
pr_cont(" |");
|
|
dotest(rwsem_ABBA1, FAILURE, LOCKTYPE_RWSEM);
|
|
|
|
print_testname("mixed read-lock/lock-read ABBA");
|
|
pr_cont(" |");
|
|
dotest(rlock_ABBA2, SUCCESS, LOCKTYPE_RWLOCK);
|
|
pr_cont(" |");
|
|
dotest(rwsem_ABBA2, FAILURE, LOCKTYPE_RWSEM);
|
|
|
|
print_testname("mixed write-lock/lock-write ABBA");
|
|
pr_cont(" |");
|
|
dotest(rlock_ABBA3, FAILURE, LOCKTYPE_RWLOCK);
|
|
pr_cont(" |");
|
|
dotest(rwsem_ABBA3, FAILURE, LOCKTYPE_RWSEM);
|
|
|
|
print_testname("chain cached mixed R-L/L-W ABBA");
|
|
pr_cont(" |");
|
|
dotest(rlock_chaincache_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
|
|
|
|
DO_TESTCASE_6x1RRB("rlock W1R2/W2R3/W3R1", W1R2_W2R3_W3R1);
|
|
DO_TESTCASE_6x1RRB("rlock W1W2/R2R3/W3R1", W1W2_R2R3_W3R1);
|
|
DO_TESTCASE_6x1RR("rlock W1W2/R2R3/R3W1", W1W2_R2R3_R3W1);
|
|
DO_TESTCASE_6x1RR("rlock W1R2/R2R3/W3W1", W1R2_R2R3_W3W1);
|
|
|
|
printk(" --------------------------------------------------------------------------\n");
|
|
/*
|
|
* irq-context testcases:
|
|
*/
|
|
DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1);
|
|
NON_RT(DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A));
|
|
DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B);
|
|
DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3);
|
|
DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4);
|
|
DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion);
|
|
|
|
DO_TESTCASE_6x2x2RW("irq read-recursion", irq_read_recursion);
|
|
DO_TESTCASE_6x2x2RW("irq read-recursion #2", irq_read_recursion2);
|
|
DO_TESTCASE_6x2x2RW("irq read-recursion #3", irq_read_recursion3);
|
|
|
|
ww_tests();
|
|
|
|
force_read_lock_recursive = 0;
|
|
/*
|
|
* queued_read_lock() specific test cases can be put here
|
|
*/
|
|
if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS))
|
|
queued_read_lock_tests();
|
|
|
|
fs_reclaim_tests();
|
|
|
|
/* Wait context test cases that are specific for RAW_LOCK_NESTING */
|
|
if (IS_ENABLED(CONFIG_PROVE_RAW_LOCK_NESTING))
|
|
wait_context_tests();
|
|
|
|
local_lock_tests();
|
|
|
|
print_testname("hardirq_unsafe_softirq_safe");
|
|
dotest(hardirq_deadlock_softirq_not_deadlock, FAILURE, LOCKTYPE_SPECIAL);
|
|
pr_cont("\n");
|
|
|
|
lockdep_set_subclass_name_test();
|
|
|
|
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;
|
|
}
|