[PATCH 2/3] drm/virtio: Add VIRTIO_GPU_CMD_WAIT_FLUSH cmd

[Vivek Kasireddy]

This implements the hypercall interface for the wait_flush
command.

Cc: Gerd Hoffmann <kraxel at redhat.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy at intel.com>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h |  4 ++++
 drivers/gpu/drm/virtio/virtgpu_vq.c  | 17 +++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index d9dbc4f258f3..f77d196ccc8f 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -403,6 +403,10 @@ virtio_gpu_cmd_set_scanout_blob(struct virtio_gpu_device *vgdev,
 				struct drm_framebuffer *fb,
 				uint32_t width, uint32_t height,
 				uint32_t x, uint32_t y);
+void virtio_gpu_cmd_wait_flush(struct virtio_gpu_device *vgdev,
+			       struct virtio_gpu_object_array *objs,
+			       struct virtio_gpu_fence *fence);
+
 
 /* virtgpu_display.c */
 int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev);
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index cf84d382dd41..0042a143e71e 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -1307,3 +1307,20 @@ void virtio_gpu_cmd_set_scanout_blob(struct virtio_gpu_device *vgdev,
 
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
 }
+
+void virtio_gpu_cmd_wait_flush(struct virtio_gpu_device *vgdev,
+			       struct virtio_gpu_object_array *objs,
+			       struct virtio_gpu_fence *fence)
+{
+	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(objs->objs[0]);
+	struct virtio_gpu_wait_flush *cmd_p;
+	struct virtio_gpu_vbuffer *vbuf;
+
+	cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
+	memset(cmd_p, 0, sizeof(*cmd_p));
+	vbuf->objs = objs;
+
+	cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_WAIT_FLUSH);
+	cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle);
+	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
+}
-- 
2.30.2