It is a helper to return the virtio_gpu_ctrl_hdr in a vbuf.
Signed-off-by: Chia-I Wu olvaffe@gmail.com --- drivers/gpu/drm/virtio/virtgpu_vq.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c index 63d2df7fb0c98..312fd8a039a1e 100644 --- a/drivers/gpu/drm/virtio/virtgpu_vq.c +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c @@ -95,7 +95,8 @@ virtio_gpu_get_vbuf(struct virtio_gpu_device *vgdev, if (!vbuf) return ERR_PTR(-ENOMEM);
- BUG_ON(size > MAX_INLINE_CMD_SIZE); + BUG_ON(size > MAX_INLINE_CMD_SIZE || + size < sizeof(struct virtio_gpu_ctrl_hdr)); vbuf->buf = (void *)vbuf + sizeof(*vbuf); vbuf->size = size;
@@ -109,6 +110,16 @@ virtio_gpu_get_vbuf(struct virtio_gpu_device *vgdev, return vbuf; }
+static struct virtio_gpu_ctrl_hdr * +virtio_gpu_vbuf_ctrl_hdr(struct virtio_gpu_vbuffer *vbuf) +{ + /* this assumes a vbuf contains a command that starts with a + * virtio_gpu_ctrl_hdr, which is true for both ctrl and cursor + * virtqueues. + */ + return (struct virtio_gpu_ctrl_hdr *)vbuf->buf; +} + static void *virtio_gpu_alloc_cmd(struct virtio_gpu_device *vgdev, struct virtio_gpu_vbuffer **vbuffer_p, int size) @@ -211,7 +222,7 @@ void virtio_gpu_dequeue_ctrl_func(struct work_struct *work) if (resp->type != cpu_to_le32(VIRTIO_GPU_RESP_OK_NODATA)) { if (resp->type >= cpu_to_le32(VIRTIO_GPU_RESP_ERR_UNSPEC)) { struct virtio_gpu_ctrl_hdr *cmd; - cmd = (struct virtio_gpu_ctrl_hdr *)entry->buf; + cmd = virtio_gpu_vbuf_ctrl_hdr(entry); DRM_ERROR("response 0x%x (command 0x%x)\n", le32_to_cpu(resp->type), le32_to_cpu(cmd->type)); @@ -338,8 +349,7 @@ static bool virtio_gpu_queue_ctrl_buffer_locked(struct virtio_gpu_device *vgdev, ret = virtqueue_add_sgs(vq, sgs, outcnt, incnt, vbuf, GFP_ATOMIC); WARN_ON(ret);
- trace_virtio_gpu_cmd_queue(vq, - (struct virtio_gpu_ctrl_hdr *)vbuf->buf); + trace_virtio_gpu_cmd_queue(vq, virtio_gpu_vbuf_ctrl_hdr(vbuf));
notify = virtqueue_kick_prepare(vq);
@@ -458,7 +468,7 @@ static void virtio_gpu_queue_cursor(struct virtio_gpu_device *vgdev, goto retry; } else { trace_virtio_gpu_cmd_queue(vq, - (struct virtio_gpu_ctrl_hdr *)vbuf->buf); + virtio_gpu_vbuf_ctrl_hdr(vbuf));
notify = virtqueue_kick_prepare(vq); }