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mutex: Add more w/w tests to test EDEADLK path handling 

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: dri-devel@lists.freedesktop.org
Cc: linaro-mm-sig@lists.linaro.org
Cc: rostedt@goodmis.org
Cc: daniel@ffwll.ch
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20130620113141.4001.54331.stgit@patser
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Maarten Lankhorst 2013-06-20 13:31:42 +02:00 committed by Ingo Molnar
parent 2fe3d4b149
commit f3cf139efa
1 changed files with 261 additions and 3 deletions
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264
lib/locking-selftest.c
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@ -47,7 +47,7 @@ __setup("debug_locks_verbose=", setup_debug_locks_verbose);
#define LOCKTYPE_WW 0x10
static struct ww_acquire_ctx t, t2;
static struct ww_mutex o, o2;
static struct ww_mutex o, o2, o3;
/*
* Normal standalone locks, for the circular and irq-context
@ -947,12 +947,12 @@ static void reset_locks(void)
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(t); I_WW(t2); I_WW(o.base); I_WW(o2.base); I_WW(o3.base);
lockdep_reset();
I2(A); I2(B); I2(C); I2(D);
init_shared_classes();
ww_mutex_init(&o, &ww_lockdep); ww_mutex_init(&o2, &ww_lockdep);
ww_mutex_init(&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));
@ -1292,6 +1292,251 @@ static void ww_test_object_lock_stale_context(void)
WWL(&o, &t);
}
static void ww_test_edeadlk_normal(void)
{
int ret;
mutex_lock(&o2.base);
o2.ctx = &t2;
mutex_release(&o2.base.dep_map, 1, _THIS_IP_);
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
o2.ctx = NULL;
mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
mutex_unlock(&o2.base);
WWU(&o);
WWL(&o2, &t);
}
static void ww_test_edeadlk_normal_slow(void)
{
int ret;
mutex_lock(&o2.base);
mutex_release(&o2.base.dep_map, 1, _THIS_IP_);
o2.ctx = &t2;
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
o2.ctx = NULL;
mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
mutex_unlock(&o2.base);
WWU(&o);
ww_mutex_lock_slow(&o2, &t);
}
static void ww_test_edeadlk_no_unlock(void)
{
int ret;
mutex_lock(&o2.base);
o2.ctx = &t2;
mutex_release(&o2.base.dep_map, 1, _THIS_IP_);
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
o2.ctx = NULL;
mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
mutex_unlock(&o2.base);
WWL(&o2, &t);
}
static void ww_test_edeadlk_no_unlock_slow(void)
{
int ret;
mutex_lock(&o2.base);
mutex_release(&o2.base.dep_map, 1, _THIS_IP_);
o2.ctx = &t2;
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
o2.ctx = NULL;
mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
mutex_unlock(&o2.base);
ww_mutex_lock_slow(&o2, &t);
}
static void ww_test_edeadlk_acquire_more(void)
{
int ret;
mutex_lock(&o2.base);
mutex_release(&o2.base.dep_map, 1, _THIS_IP_);
o2.ctx = &t2;
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
ret = WWL(&o3, &t);
}
static void ww_test_edeadlk_acquire_more_slow(void)
{
int ret;
mutex_lock(&o2.base);
mutex_release(&o2.base.dep_map, 1, _THIS_IP_);
o2.ctx = &t2;
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
ww_mutex_lock_slow(&o3, &t);
}
static void ww_test_edeadlk_acquire_more_edeadlk(void)
{
int ret;
mutex_lock(&o2.base);
mutex_release(&o2.base.dep_map, 1, _THIS_IP_);
o2.ctx = &t2;
mutex_lock(&o3.base);
mutex_release(&o3.base.dep_map, 1, _THIS_IP_);
o3.ctx = &t2;
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
ret = WWL(&o3, &t);
WARN_ON(ret != -EDEADLK);
}
static void ww_test_edeadlk_acquire_more_edeadlk_slow(void)
{
int ret;
mutex_lock(&o2.base);
mutex_release(&o2.base.dep_map, 1, _THIS_IP_);
o2.ctx = &t2;
mutex_lock(&o3.base);
mutex_release(&o3.base.dep_map, 1, _THIS_IP_);
o3.ctx = &t2;
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
ww_mutex_lock_slow(&o3, &t);
}
static void ww_test_edeadlk_acquire_wrong(void)
{
int ret;
mutex_lock(&o2.base);
mutex_release(&o2.base.dep_map, 1, _THIS_IP_);
o2.ctx = &t2;
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
if (!ret)
WWU(&o2);
WWU(&o);
ret = WWL(&o3, &t);
}
static void ww_test_edeadlk_acquire_wrong_slow(void)
{
int ret;
mutex_lock(&o2.base);
mutex_release(&o2.base.dep_map, 1, _THIS_IP_);
o2.ctx = &t2;
WWAI(&t);
t2 = t;
t2.stamp--;
ret = WWL(&o, &t);
WARN_ON(ret);
ret = WWL(&o2, &t);
WARN_ON(ret != -EDEADLK);
if (!ret)
WWU(&o2);
WWU(&o);
ww_mutex_lock_slow(&o3, &t);
}
static void ww_test_spin_nest_unlocked(void)
{
raw_spin_lock_nest_lock(&lock_A, &o.base);
@ -1498,6 +1743,19 @@ static void ww_tests(void)
dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW);
printk("\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);
printk("\n");
print_testname("spinlock nest unlocked");
dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW);
printk("\n");