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Date: Thu, 20 Jun 2013 13:31:42 +0200
From: Maarten Lankhorst <maarten.lankhorst@...onical.com>
To: linux-kernel@...r.kernel.org
Cc: linux-arch@...r.kernel.org, peterz@...radead.org, x86@...nel.org,
dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
robclark@...il.com, rostedt@...dmis.org, daniel@...ll.ch,
tglx@...utronix.de, mingo@...nel.org, linux-media@...r.kernel.org
Subject: [PATCH v5 6/7] mutex: add more ww tests to test EDEADLK path handling
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...onical.com>
---
lib/locking-selftest.c | 264 +++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 261 insertions(+), 3 deletions(-)
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 @@ __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");
--
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