Linux Virtualization - Feb 2020 - [PATCH v4 3/6] drm/virtio: batch plane updates (pageflip)

Move virtio_gpu_notify() to higher-level functions for
virtio_gpu_cmd_resource_flush(), virtio_gpu_cmd_set_scanout() and
virtio_gpu_cmd_transfer_to_host_{2d,3d}().

virtio_gpu_primary_plane_update() will notify only once for a series
of commands (restores plane update command batching).

Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
Reviewed-by: Chia-I Wu <olvaffe at gmail.com>
---
 drivers/gpu/drm/virtio/virtgpu_display.c | 2 ++
 drivers/gpu/drm/virtio/virtgpu_ioctl.c   | 1 +
 drivers/gpu/drm/virtio/virtgpu_plane.c   | 3 +++
 drivers/gpu/drm/virtio/virtgpu_vq.c      | 4 ----
 4 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_display.c
b/drivers/gpu/drm/virtio/virtgpu_display.c
index af953db4a0c9..2b7e6ae65546 100644
--- a/drivers/gpu/drm/virtio/virtgpu_display.c
+++ b/drivers/gpu/drm/virtio/virtgpu_display.c
@@ -90,6 +90,7 @@ static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc
*crtc)
 	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
 				   crtc->mode.hdisplay,
 				   crtc->mode.vdisplay, 0, 0);
+	virtio_gpu_notify(vgdev);
 }
 
 static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
@@ -108,6 +109,7 @@ static void virtio_gpu_crtc_atomic_disable(struct drm_crtc
*crtc,
 	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 
 	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
+	virtio_gpu_notify(vgdev);
 	output->enabled = false;
 }
 
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 0477d1250f2d..467649733d24 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -359,6 +359,7 @@ static int virtio_gpu_transfer_to_host_ioctl(struct
drm_device *dev, void *data,
 			 args->level, &args->box, objs, fence);
 		dma_fence_put(&fence->f);
 	}
+	virtio_gpu_notify(vgdev);
 	return 0;
 
 err_unlock:
diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c
b/drivers/gpu/drm/virtio/virtgpu_plane.c
index 08b2e4127eb3..52d24179bcec 100644
--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
+++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
@@ -148,6 +148,7 @@ static void virtio_gpu_primary_plane_update(struct drm_plane
*plane,
 					   plane->state->src_w >> 16,
 					   plane->state->src_h >> 16,
 					   0, 0);
+		virtio_gpu_notify(vgdev);
 		return;
 	}
 
@@ -184,6 +185,7 @@ static void virtio_gpu_primary_plane_update(struct drm_plane
*plane,
 				      rect.y1,
 				      rect.x2 - rect.x1,
 				      rect.y2 - rect.y1);
+	virtio_gpu_notify(vgdev);
 }
 
 static int virtio_gpu_cursor_prepare_fb(struct drm_plane *plane,
@@ -262,6 +264,7 @@ static void virtio_gpu_cursor_plane_update(struct drm_plane
*plane,
 			 plane->state->crtc_w,
 			 plane->state->crtc_h,
 			 0, 0, objs, vgfb->fence);
+		virtio_gpu_notify(vgdev);
 		dma_fence_wait(&vgfb->fence->f, true);
 		dma_fence_put(&vgfb->fence->f);
 		vgfb->fence = NULL;
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c
b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 653efb26bcd9..0bd1c51bbabd 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -568,7 +568,6 @@ void virtio_gpu_cmd_set_scanout(struct virtio_gpu_device
*vgdev,
 	cmd_p->r.y = cpu_to_le32(y);
 
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_resource_flush(struct virtio_gpu_device *vgdev,
@@ -590,7 +589,6 @@ void virtio_gpu_cmd_resource_flush(struct virtio_gpu_device
*vgdev,
 	cmd_p->r.y = cpu_to_le32(y);
 
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_transfer_to_host_2d(struct virtio_gpu_device *vgdev,
@@ -623,7 +621,6 @@ void virtio_gpu_cmd_transfer_to_host_2d(struct
virtio_gpu_device *vgdev,
 	cmd_p->r.y = cpu_to_le32(y);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
-	virtio_gpu_notify(vgdev);
 }
 
 static void
@@ -1049,7 +1046,6 @@ void virtio_gpu_cmd_transfer_to_host_3d(struct
virtio_gpu_device *vgdev,
 	cmd_p->level = cpu_to_le32(level);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_transfer_from_host_3d(struct virtio_gpu_device *vgdev,
-- 
2.18.2