drm/virtio: rework resource creation workflow.

This patch moves the virtio_gpu_cmd_create_resource() call (which
notifies the host about the new resource created) into the
virtio_gpu_object_create() function.  That way we can call
virtio_gpu_cmd_create_resource() before ttm_bo_init(), so the host
already knows about the object when ttm initializes the object and calls
our driver callbacks.

Specifically the object is already created when the
virtio_gpu_ttm_tt_bind() callback invokes virtio_gpu_object_attach(),
so the extra virtio_gpu_object_attach() calls done after
virtio_gpu_object_create() are not needed any more.

The fence support for the create ioctl becomes a bit more tricky though.
The code moved into virtio_gpu_object_create() too.  We first submit the
(fenced) virtio_gpu_cmd_create_resource() command, then initialize the
ttm object, and finally attach just created object to the fence for the
command in case it didn't finish yet.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20190318113332.10900-6-kraxel@redhat.com

1 files changed, 5 insertions, 14 deletions

diff --git a/drivers/gpu/drm/virtio/virtgpu_gem.c b/drivers/gpu/drm/virtio/virtgpu_gem.c
index ac15863643e7..1e49e08dd545 100644
--- a/drivers/gpu/drm/virtio/virtgpu_gem.c
+++ b/drivers/gpu/drm/virtio/virtgpu_gem.c
@@ -36,13 +36,14 @@ void virtio_gpu_gem_free_object(struct drm_gem_object *gem_obj)
 
 struct virtio_gpu_object*
 virtio_gpu_alloc_object(struct drm_device *dev,
-			struct virtio_gpu_object_params *params)
+			struct virtio_gpu_object_params *params,
+			struct virtio_gpu_fence *fence)
 {
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct virtio_gpu_object *obj;
 	int ret;
 
-	ret = virtio_gpu_object_create(vgdev, params, &obj);
+	ret = virtio_gpu_object_create(vgdev, params, &obj, fence);
 	if (ret)
 		return ERR_PTR(ret);
 
@@ -59,7 +60,7 @@ int virtio_gpu_gem_create(struct drm_file *file,
 	int ret;
 	u32 handle;
 
-	obj = virtio_gpu_alloc_object(dev, params);
+	obj = virtio_gpu_alloc_object(dev, params, NULL);
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);
 
@@ -82,9 +83,7 @@ int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
 				struct drm_device *dev,
 				struct drm_mode_create_dumb *args)
 {
-	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct drm_gem_object *gobj;
-	struct virtio_gpu_object *obj;
 	struct virtio_gpu_object_params params = { 0 };
 	int ret;
 	uint32_t pitch;
@@ -100,20 +99,12 @@ int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
 	params.width = args->width;
 	params.height = args->height;
 	params.size = args->size;
+	params.dumb = true;
 	ret = virtio_gpu_gem_create(file_priv, dev, &params, &gobj,
 				    &args->handle);
 	if (ret)
 		goto fail;
 
-	obj = gem_to_virtio_gpu_obj(gobj);
-	virtio_gpu_cmd_create_resource(vgdev, obj, &params);
-
-	/* attach the object to the resource */
-	ret = virtio_gpu_object_attach(vgdev, obj, NULL);
-	if (ret)
-		goto fail;
-
-	obj->dumb = true;
 	args->pitch = pitch;
 	return ret;