From: Rob Clark robdclark@chromium.org
Now that the inactive_list is protected by mm_lock, and everything else on per-obj basis is protected by obj->lock, we no longer depend on struct_mutex.
Signed-off-by: Rob Clark robdclark@chromium.org --- drivers/gpu/drm/msm/msm_gem.c | 1 - drivers/gpu/drm/msm/msm_gem_shrinker.c | 54 -------------------------- 2 files changed, 55 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index c39ba9030001..cf17c79d99ae 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -688,7 +688,6 @@ void msm_gem_purge(struct drm_gem_object *obj) struct drm_device *dev = obj->dev; struct msm_gem_object *msm_obj = to_msm_bo(obj);
- WARN_ON(!mutex_is_locked(&dev->struct_mutex)); WARN_ON(!is_purgeable(msm_obj)); WARN_ON(obj->import_attach);
diff --git a/drivers/gpu/drm/msm/msm_gem_shrinker.c b/drivers/gpu/drm/msm/msm_gem_shrinker.c index 6be073b8ca08..6f4b1355725f 100644 --- a/drivers/gpu/drm/msm/msm_gem_shrinker.c +++ b/drivers/gpu/drm/msm/msm_gem_shrinker.c @@ -8,48 +8,13 @@ #include "msm_gem.h" #include "msm_gpu_trace.h"
-static bool msm_gem_shrinker_lock(struct drm_device *dev, bool *unlock) -{ - /* NOTE: we are *closer* to being able to get rid of - * mutex_trylock_recursive().. the msm_gem code itself does - * not need struct_mutex, although codepaths that can trigger - * shrinker are still called in code-paths that hold the - * struct_mutex. - * - * Also, msm_obj->madv is protected by struct_mutex. - * - * The next step is probably split out a seperate lock for - * protecting inactive_list, so that shrinker does not need - * struct_mutex. - */ - switch (mutex_trylock_recursive(&dev->struct_mutex)) { - case MUTEX_TRYLOCK_FAILED: - return false; - - case MUTEX_TRYLOCK_SUCCESS: - *unlock = true; - return true; - - case MUTEX_TRYLOCK_RECURSIVE: - *unlock = false; - return true; - } - - BUG(); -} - static unsigned long msm_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) { struct msm_drm_private *priv = container_of(shrinker, struct msm_drm_private, shrinker); - struct drm_device *dev = priv->dev; struct msm_gem_object *msm_obj; unsigned long count = 0; - bool unlock; - - if (!msm_gem_shrinker_lock(dev, &unlock)) - return 0;
mutex_lock(&priv->mm_lock);
@@ -63,9 +28,6 @@ msm_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc)
mutex_unlock(&priv->mm_lock);
- if (unlock) - mutex_unlock(&dev->struct_mutex); - return count; }
@@ -74,13 +36,8 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) { struct msm_drm_private *priv = container_of(shrinker, struct msm_drm_private, shrinker); - struct drm_device *dev = priv->dev; struct msm_gem_object *msm_obj; unsigned long freed = 0; - bool unlock; - - if (!msm_gem_shrinker_lock(dev, &unlock)) - return SHRINK_STOP;
mutex_lock(&priv->mm_lock);
@@ -98,9 +55,6 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
mutex_unlock(&priv->mm_lock);
- if (unlock) - mutex_unlock(&dev->struct_mutex); - if (freed > 0) trace_msm_gem_purge(freed << PAGE_SHIFT);
@@ -112,13 +66,8 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr) { struct msm_drm_private *priv = container_of(nb, struct msm_drm_private, vmap_notifier); - struct drm_device *dev = priv->dev; struct msm_gem_object *msm_obj; unsigned unmapped = 0; - bool unlock; - - if (!msm_gem_shrinker_lock(dev, &unlock)) - return NOTIFY_DONE;
mutex_lock(&priv->mm_lock);
@@ -141,9 +90,6 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr)
mutex_unlock(&priv->mm_lock);
- if (unlock) - mutex_unlock(&dev->struct_mutex); - *(unsigned long *)ptr += unmapped;
if (unmapped > 0)