[PATCH 2/2] drm/i915: Replace intel_plane->wait_req with plane->fence

[Chris Wilson]

Now that we subclass our request from struct fence, we start using the
common primitives more freely and so avoid hand-rolling routines already
provided for by the helpers.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_atomic_plane.c |  3 --
 drivers/gpu/drm/i915/intel_display.c      | 52 +++----------------------------
 drivers/gpu/drm/i915/intel_drv.h          |  1 -
 3 files changed, 5 insertions(+), 51 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
index b82de3072d4f..b41bf380f2ab 100644
--- a/drivers/gpu/drm/i915/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
@@ -77,14 +77,12 @@ intel_plane_duplicate_state(struct drm_plane *plane)
 	struct intel_plane_state *intel_state;
 
 	intel_state = kmemdup(plane->state, sizeof(*intel_state), GFP_KERNEL);
-
 	if (!intel_state)
 		return NULL;
 
 	state = &intel_state->base;
 
 	__drm_atomic_helper_plane_duplicate_state(plane, state);
-	intel_state->wait_req = NULL;
 
 	return state;
 }
@@ -101,7 +99,6 @@ void
 intel_plane_destroy_state(struct drm_plane *plane,
 			  struct drm_plane_state *state)
 {
-	WARN_ON(state && to_intel_plane_state(state)->wait_req);
 	drm_atomic_helper_plane_destroy_state(plane, state);
 }
 
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 123112c240e0..1b5f653d595b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13944,9 +13944,7 @@ static int intel_atomic_prepare_commit(struct drm_device *dev,
 				       bool nonblock)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct drm_plane_state *plane_state;
 	struct drm_crtc_state *crtc_state;
-	struct drm_plane *plane;
 	struct drm_crtc *crtc;
 	int i, ret;
 
@@ -13969,27 +13967,6 @@ static int intel_atomic_prepare_commit(struct drm_device *dev,
 	ret = drm_atomic_helper_prepare_planes(dev, state);
 	mutex_unlock(&dev->struct_mutex);
 
-	if (!ret && !nonblock) {
-		for_each_plane_in_state(state, plane, plane_state, i) {
-			struct intel_plane_state *intel_plane_state =
-				to_intel_plane_state(plane_state);
-
-			if (!intel_plane_state->wait_req)
-				continue;
-
-			ret = i915_wait_request(intel_plane_state->wait_req,
-						true, NULL, NULL);
-			if (ret) {
-				/* Any hang should be swallowed by the wait */
-				WARN_ON(ret == -EIO);
-				mutex_lock(&dev->struct_mutex);
-				drm_atomic_helper_cleanup_planes(dev, state);
-				mutex_unlock(&dev->struct_mutex);
-				break;
-			}
-		}
-	}
-
 	return ret;
 }
 
@@ -14076,27 +14053,12 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
 	struct drm_crtc_state *old_crtc_state;
 	struct drm_crtc *crtc;
 	struct intel_crtc_state *intel_cstate;
-	struct drm_plane *plane;
-	struct drm_plane_state *plane_state;
 	bool hw_check = intel_state->modeset;
 	unsigned long put_domains[I915_MAX_PIPES] = {};
 	unsigned crtc_vblank_mask = 0;
-	int i, ret;
-
-	for_each_plane_in_state(state, plane, plane_state, i) {
-		struct intel_plane_state *intel_plane_state =
-			to_intel_plane_state(plane_state);
-
-		if (!intel_plane_state->wait_req)
-			continue;
-
-		ret = i915_wait_request(intel_plane_state->wait_req,
-					true, NULL, NULL);
-		/* EIO should be eaten, and we can't get interrupted in the
-		 * worker, and blocking commits have waited already. */
-		WARN_ON(ret);
-	}
+	int i;
 
+	drm_atomic_helper_wait_for_fences(dev, state);
 	drm_atomic_helper_wait_for_dependencies(state);
 
 	if (intel_state->modeset) {
@@ -14506,9 +14468,9 @@ intel_prepare_plane_fb(struct drm_plane *plane,
 	}
 
 	if (ret == 0) {
-		to_intel_plane_state(new_state)->wait_req =
-			i915_gem_active_get(&obj->last_write,
-					    &obj->base.dev->struct_mutex);
+		new_state->fence =
+			&i915_gem_active_get(&obj->last_write,
+					     &obj->base.dev->struct_mutex)->fence;
 	}
 
 	return ret;
@@ -14529,7 +14491,6 @@ intel_cleanup_plane_fb(struct drm_plane *plane,
 {
 	struct drm_device *dev = plane->dev;
 	struct intel_plane_state *old_intel_state;
-	struct intel_plane_state *intel_state = to_intel_plane_state(plane->state);
 	struct drm_i915_gem_object *old_obj = intel_fb_obj(old_state->fb);
 	struct drm_i915_gem_object *obj = intel_fb_obj(plane->state->fb);
 
@@ -14541,9 +14502,6 @@ intel_cleanup_plane_fb(struct drm_plane *plane,
 	if (old_obj && (plane->type != DRM_PLANE_TYPE_CURSOR ||
 	    !INTEL_INFO(dev)->cursor_needs_physical))
 		intel_unpin_fb_obj(old_state->fb, old_state->rotation);
-
-	i915_gem_request_assign(&intel_state->wait_req, NULL);
-	i915_gem_request_assign(&old_intel_state->wait_req, NULL);
 }
 
 int
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 774aab342f40..acb42d66fb08 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -383,7 +383,6 @@ struct intel_plane_state {
 	struct drm_intel_sprite_colorkey ckey;
 
 	/* async flip related structures */
-	struct drm_i915_gem_request *wait_req;
 };
 
 struct intel_initial_plane_config {
-- 
2.9.3