drm/i915: move flushing list processing to i915_retire_commands

... instead of threading flush_domains through the execbuf code to
i915_add_request.

With this change 2 small cleanups are possible (likewise the majority
of the patch):

- The flush_domains parameter of i915_add_request is always 0. Drop it
  and the corresponding logic.
- Ditto for the seqno param of i915_gem_process_flushing_list.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_overlay.c b/drivers/gpu/drm/i915/intel_overlay.c
index 1d306a4..a203b5c 100644
--- a/drivers/gpu/drm/i915/intel_overlay.c
+++ b/drivers/gpu/drm/i915/intel_overlay.c
@@ -230,7 +230,7 @@
 	ADVANCE_LP_RING();
 
 	overlay->last_flip_req =
-		i915_add_request(dev, NULL, 0, &dev_priv->render_ring);
+		i915_add_request(dev, NULL, &dev_priv->render_ring);
 	if (overlay->last_flip_req == 0)
 		return -ENOMEM;
 
@@ -269,7 +269,7 @@
         ADVANCE_LP_RING();
 
 	overlay->last_flip_req =
-		i915_add_request(dev, NULL, 0, &dev_priv->render_ring);
+		i915_add_request(dev, NULL, &dev_priv->render_ring);
 }
 
 static int intel_overlay_wait_flip(struct intel_overlay *overlay)
@@ -301,7 +301,7 @@
         ADVANCE_LP_RING();
 
 	overlay->last_flip_req =
-		i915_add_request(dev, NULL, 0, &dev_priv->render_ring);
+		i915_add_request(dev, NULL, &dev_priv->render_ring);
 	if (overlay->last_flip_req == 0)
 		return -ENOMEM;
 
@@ -342,7 +342,7 @@
         ADVANCE_LP_RING();
 
 	overlay->last_flip_req =
-		i915_add_request(dev, NULL, 0, &dev_priv->render_ring);
+		i915_add_request(dev, NULL, &dev_priv->render_ring);
 	if (overlay->last_flip_req == 0)
 		return -ENOMEM;
 
@@ -362,7 +362,7 @@
 	ADVANCE_LP_RING();
 
 	overlay->last_flip_req =
-		i915_add_request(dev, NULL, 0, &dev_priv->render_ring);
+		i915_add_request(dev, NULL, &dev_priv->render_ring);
 	if (overlay->last_flip_req == 0)
 		return -ENOMEM;
 
@@ -409,7 +409,7 @@
 
 	if (overlay->last_flip_req == 0) {
 		overlay->last_flip_req =
-			i915_add_request(dev, NULL, 0, &dev_priv->render_ring);
+			i915_add_request(dev, NULL, &dev_priv->render_ring);
 		if (overlay->last_flip_req == 0)
 			return -ENOMEM;
 	}
@@ -439,8 +439,9 @@
 			OUT_RING(MI_NOOP);
 			ADVANCE_LP_RING();
 
-			overlay->last_flip_req = i915_add_request(dev, NULL,
-					0, &dev_priv->render_ring);
+			overlay->last_flip_req =
+				i915_add_request(dev, NULL,
+						 &dev_priv->render_ring);
 			if (overlay->last_flip_req == 0)
 				return -ENOMEM;