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

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

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c69f1fa38cc8..62ba9c121a14 100644
--- 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);