drm/i915: Immediately discard any backing storage for uneeded objects

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c69f1fa38cc8174d927deb307d4a9021688dbb6d..62ba9c121a1406c3ab93b1acba281df1ff9ee7ae 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4110,6 +4110,11 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
        obj_priv->madv = args->madv;
        args->retained = obj_priv->gtt_space != NULL;
 
+       /* if the object is no longer bound, discard its backing storage */
+       if (i915_gem_object_is_purgeable(obj_priv) &&
+           obj_priv->gtt_space == NULL)
+               i915_gem_object_truncate(obj);
+
        drm_gem_object_unreference(obj);
        mutex_unlock(&dev->struct_mutex);