[RFC PATCH v2 7/9] drm: atomic: factor out common out-fence operations

[Brian Starkey]

Some parts of setting up the CRTC out-fence can be re-used for
writeback out-fences. Factor this out into a separate function.

Signed-off-by: Brian Starkey <brian.starkey at arm.com>
---
 drivers/gpu/drm/drm_atomic.c |   64 +++++++++++++++++++++++++++---------------
 1 file changed, 42 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index f434f34..3f8fc97 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1693,37 +1693,46 @@ void drm_atomic_clean_old_fb(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_atomic_clean_old_fb);
 
-static int crtc_setup_out_fence(struct drm_crtc *crtc,
-				struct drm_crtc_state *crtc_state,
-				struct drm_out_fence_state *fence_state)
+static struct fence *get_crtc_fence(struct drm_crtc *crtc,
+				    struct drm_crtc_state *crtc_state)
 {
 	struct fence *fence;
 
-	fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
-	if (fence_state->fd < 0) {
-		return fence_state->fd;
-	}
-
-	fence_state->out_fence_ptr = crtc_state->out_fence_ptr;
-	crtc_state->out_fence_ptr = NULL;
-
-	if (put_user(fence_state->fd, fence_state->out_fence_ptr))
-		return -EFAULT;
-
 	fence = kzalloc(sizeof(*fence), GFP_KERNEL);
 	if (!fence)
-		return -ENOMEM;
+		return NULL;
 
 	fence_init(fence, &drm_crtc_fence_ops, &crtc->fence_lock,
 		   crtc->fence_context, ++crtc->fence_seqno);
 
+	crtc_state->event->base.fence = fence_get(fence);
+
+	return fence;
+}
+
+static int setup_out_fence(struct drm_out_fence_state *fence_state,
+			   u64 __user *out_fence_ptr,
+			   struct fence *fence)
+{
+	int ret;
+
+	DRM_DEBUG_ATOMIC("Putting out-fence %p into user ptr: %p\n",
+			 fence, out_fence_ptr);
+
+	fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
+	if (fence_state->fd < 0)
+		return fence_state->fd;
+
+	ret = put_user(fence_state->fd, out_fence_ptr);
+	if (ret)
+		return ret;
+
+	fence_state->out_fence_ptr = out_fence_ptr;
+
 	fence_state->sync_file = sync_file_create(fence);
-	if(!fence_state->sync_file) {
-		fence_put(fence);
+	if (!fence_state->sync_file)
 		return -ENOMEM;
-	}
 
-	crtc_state->event->base.fence = fence_get(fence);
 	return 0;
 }
 
@@ -1896,10 +1905,21 @@ retry:
 		}
 
 		if (crtc_state->out_fence_ptr) {
-			ret = crtc_setup_out_fence(crtc, crtc_state,
-						   &fence_state[fence_idx++]);
-			if (ret)
+			struct fence *fence = get_crtc_fence(crtc, crtc_state);
+			if (!fence) {
+				ret = -ENOMEM;
+				goto out;
+			}
+
+			ret = setup_out_fence(&fence_state[fence_idx++],
+					      crtc_state->out_fence_ptr,
+					      fence);
+			if (ret) {
+				fence_put(fence);
 				goto out;
+			}
+
+			crtc_state->out_fence_ptr = NULL;
 		}
 	}
 
-- 
1.7.9.5