@@ -4339,6 +4339,19 @@ void i915_gem_release(struct drm_device *dev, struct drm_file *file)
spin_unlock(&file_priv->mm.lock);
}
+static bool mutex_is_locked_by(struct mutex *mutex, struct task_struct *task)
+{
+ if (!mutex_is_locked(mutex))
+ return false;
+
+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_MUTEXES)
+ return mutex->owner == task;
+#else
+ /* Since UP may be pre-empted, we cannot assume that we own the lock */
+ return false;
+#endif
+}
+
static int
i915_gem_inactive_shrink(struct shrinker *shrinker, struct shrink_control *sc)
{
@@ -4349,10 +4362,15 @@ i915_gem_inactive_shrink(struct shrinker *shrinker, struct shrink_control *sc)
struct drm_device *dev = dev_priv->dev;
struct drm_i915_gem_object *obj;
int nr_to_scan = sc->nr_to_scan;
+ bool unlock = true;
int cnt;
- if (!mutex_trylock(&dev->struct_mutex))
- return 0;
+ if (!mutex_trylock(&dev->struct_mutex)) {
+ if (!mutex_is_locked_by(&dev->struct_mutex, current))
+ return 0;
+
+ unlock = false;
+ }
if (nr_to_scan) {
nr_to_scan -= i915_gem_purge(dev_priv, nr_to_scan);
@@ -4368,6 +4386,7 @@ i915_gem_inactive_shrink(struct shrinker *shrinker, struct shrink_control *sc)
if (obj->pin_count == 0 && obj->pages_pin_count == 0)
cnt += obj->base.size >> PAGE_SHIFT;
- mutex_unlock(&dev->struct_mutex);
+ if (unlock)
+ mutex_unlock(&dev->struct_mutex);
return cnt;
}
If we have hit oom whilst holding our struct_mutex, then currently we cannot reap our own GPU buffers which likely pin most of memory, making an outright OOM more likely. So if we are running in direct reclaim and already hold the mutex, attempt to free buffers knowing that the original function can not continue until we return. v2: Add a note explaining that the mutex may be stolen due to pre-emption, and that is bad. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> --- drivers/gpu/drm/i915/i915_gem.c | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-)