locktorture: Add nested locking to rtmutex torture tests

This patch adds randomized nested locking to the rtmutex torture
tests. Additionally it adds LOCK09 config files for testing
rtmutexes with nested locking.

Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: kernel-team@android.com
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Co-developed-by: Connor O'Brien <connoro@google.com>
Signed-off-by: Connor O'Brien <connoro@google.com>
Signed-off-by: John Stultz <jstultz@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index a4d15a9..c7f264a 100644 (file)
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -544,6 +544,28 @@ static struct lock_torture_ops ww_mutex_lock_ops = {
 
 #ifdef CONFIG_RT_MUTEXES
 static DEFINE_RT_MUTEX(torture_rtmutex);
+static struct rt_mutex torture_nested_rtmutexes[MAX_NESTED_LOCKS];
+static struct lock_class_key nested_rtmutex_keys[MAX_NESTED_LOCKS];
+
+static void torture_rtmutex_init(void)
+{
+       int i;
+
+       for (i = 0; i < MAX_NESTED_LOCKS; i++)
+               __rt_mutex_init(&torture_nested_rtmutexes[i], __func__,
+                               &nested_rtmutex_keys[i]);
+}
+
+static int torture_rtmutex_nested_lock(int tid __maybe_unused,
+                                      u32 lockset)
+{
+       int i;
+
+       for (i = 0; i < nested_locks; i++)
+               if (lockset & (1 << i))
+                       rt_mutex_lock(&torture_nested_rtmutexes[i]);
+       return 0;
+}
 
 static int torture_rtmutex_lock(int tid __maybe_unused)
 __acquires(torture_rtmutex)
@@ -585,11 +607,24 @@ static void torture_rt_boost_rtmutex(struct torture_random_state *trsp)
        __torture_rt_boost(trsp);
 }
 
+static void torture_rtmutex_nested_unlock(int tid __maybe_unused,
+                                         u32 lockset)
+{
+       int i;
+
+       for (i = nested_locks - 1; i >= 0; i--)
+               if (lockset & (1 << i))
+                       rt_mutex_unlock(&torture_nested_rtmutexes[i]);
+}
+
 static struct lock_torture_ops rtmutex_lock_ops = {
+       .init           = torture_rtmutex_init,
+       .nested_lock    = torture_rtmutex_nested_lock,
        .writelock      = torture_rtmutex_lock,
        .write_delay    = torture_rtmutex_delay,
        .task_boost     = torture_rt_boost_rtmutex,
        .writeunlock    = torture_rtmutex_unlock,
+       .nested_unlock  = torture_rtmutex_nested_unlock,
        .readlock       = NULL,
        .read_delay     = NULL,
        .readunlock     = NULL,

diff --git a/tools/testing/selftests/rcutorture/configs/lock/CFLIST b/tools/testing/selftests/rcutorture/configs/lock/CFLIST
index a48bba0..28e23d0 100644 (file)
--- a/tools/testing/selftests/rcutorture/configs/lock/CFLIST
+++ b/tools/testing/selftests/rcutorture/configs/lock/CFLIST
@@ -6,3 +6,4 @@ LOCK05
 LOCK06
 LOCK07
 LOCK08
+LOCK09

diff --git a/tools/testing/selftests/rcutorture/configs/lock/LOCK09 b/tools/testing/selftests/rcutorture/configs/lock/LOCK09
new file mode 100644 (file)
index 0000000..1d1da14
--- /dev/null
+++ b/tools/testing/selftests/rcutorture/configs/lock/LOCK09
@@ -0,0 +1,6 @@
+CONFIG_SMP=y
+CONFIG_NR_CPUS=4
+CONFIG_HOTPLUG_CPU=y
+CONFIG_PREEMPT_NONE=n
+CONFIG_PREEMPT_VOLUNTARY=n
+CONFIG_PREEMPT=y

diff --git a/tools/testing/selftests/rcutorture/configs/lock/LOCK09.boot b/tools/testing/selftests/rcutorture/configs/lock/LOCK09.boot
new file mode 100644 (file)
index 0000000..fd5eff1
--- /dev/null
+++ b/tools/testing/selftests/rcutorture/configs/lock/LOCK09.boot
@@ -0,0 +1 @@
+locktorture.torture_type=rtmutex_lock locktorture.nested_locks=8