drm/i915: Remove explicit flush from i915_gem_object_flush_fence()

As the flush is either performed explictly immediately after the
execbuffer dispatch, or before the serialisation of last_fenced_seqno we
can forgo the explict i915_gem_flush_ring().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 78fa950..feb3498 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2473,21 +2473,8 @@ static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
 static int
 i915_gem_object_flush_fence(struct drm_i915_gem_object *obj)
 {
-       int ret;
-
-       if (obj->fenced_gpu_access) {
-               if (obj->base.write_domain & I915_GEM_GPU_DOMAINS) {
-                       ret = i915_gem_flush_ring(obj->ring,
-                                                 0, obj->base.write_domain);
-                       if (ret)
-                               return ret;
-               }
-
-               obj->fenced_gpu_access = false;
-       }
-
        if (obj->last_fenced_seqno) {
-               ret = i915_wait_seqno(obj->ring, obj->last_fenced_seqno);
+               int ret = i915_wait_seqno(obj->ring, obj->last_fenced_seqno);
                if (ret)
                        return ret;
 
@@ -2500,6 +2487,7 @@ i915_gem_object_flush_fence(struct drm_i915_gem_object *obj)
        if (obj->base.read_domains & I915_GEM_DOMAIN_GTT)
                mb();
 
+       obj->fenced_gpu_access = false;
        return 0;
 }