1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 18eee8d2522d..65639ad72808 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -374,6 +374,17 @@ static int do_switch(struct drm_i915_gem_object *from_obj,
         if (ret)
                 return ret;
 
+        /* Clear this page out of any CPU caches for coherent swap-in/out. Note
+         * that thanks to write = false in this call and us not setting any gpu
+         * write domains when putting a context object onto the active list
+         * (when switching away from it), this won't block.
+         * XXX: We need a real interface to do this instead of trickery. */
+        ret = i915_gem_object_set_to_gtt_domain(to->obj, false);
+        if (ret) {
+                i915_gem_object_unpin(to->obj);
+                return ret;
+        }
+
         if (!to->obj->has_global_gtt_mapping)
                 i915_gem_gtt_bind_object(to->obj, to->obj->cache_level);