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Commit b453c4db authored by Chris Wilson's avatar Chris Wilson Committed by Daniel Vetter
Browse files

drm/i915: Refactor common lock handling between shrinker count/scan 



We can share a few lines of tricky lock handling we need to use for both
shrinker routines and in the process fix the return value for count()
when reporting a deadlock.

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: default avatarRobert Beckett <robert.beckett@intel.com>
Reviewed-by: default avatarRafael Barbalho <rafael.barbalho@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent ceabbba5

drivers/gpu/drm/i915/i915_gem.c

+22 −20
Original line number Diff line number Diff line
@@ -5001,6 +5001,22 @@ static bool mutex_is_locked_by(struct mutex *mutex, struct task_struct *task) 
#endif

}



static bool i915_gem_shrinker_lock(struct drm_device *dev, bool *unlock)

{

	if (!mutex_trylock(&dev->struct_mutex)) {

		if (!mutex_is_locked_by(&dev->struct_mutex, current))

			return false;



		if (to_i915(dev)->mm.shrinker_no_lock_stealing)

			return false;



		*unlock = false;

	} else

		*unlock = true;



	return true;

}



static int num_vma_bound(struct drm_i915_gem_object *obj)

{

	struct i915_vma *vma;
@@ -5020,19 +5036,12 @@ i915_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) 
		container_of(shrinker, struct drm_i915_private, mm.shrinker);

	struct drm_device *dev = dev_priv->dev;

	struct drm_i915_gem_object *obj;

	bool unlock = true;

	unsigned long count;

	bool unlock;



	if (!mutex_trylock(&dev->struct_mutex)) {

		if (!mutex_is_locked_by(&dev->struct_mutex, current))

			return 0;



		if (dev_priv->mm.shrinker_no_lock_stealing)

	if (!i915_gem_shrinker_lock(dev, &unlock))

		return 0;



		unlock = false;

	}



	count = 0;

	list_for_each_entry(obj, &dev_priv->mm.unbound_list, global_list)

		if (obj->pages_pin_count == 0)
@@ -5119,18 +5128,11 @@ i915_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) 
		container_of(shrinker, struct drm_i915_private, mm.shrinker);

	struct drm_device *dev = dev_priv->dev;

	unsigned long freed;

	bool unlock = true;

	bool unlock;



	if (!mutex_trylock(&dev->struct_mutex)) {

		if (!mutex_is_locked_by(&dev->struct_mutex, current))

			return SHRINK_STOP;



		if (dev_priv->mm.shrinker_no_lock_stealing)

	if (!i915_gem_shrinker_lock(dev, &unlock))

		return SHRINK_STOP;



		unlock = false;

	}



	freed = i915_gem_purge(dev_priv, sc->nr_to_scan);

	if (freed < sc->nr_to_scan)

		freed += __i915_gem_shrink(dev_priv,