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>
diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index 37faefd..d554f3f 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -47,7 +47,7 @@
#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 @@
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 @@
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 @@
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");