Thanks Dexuan, for the patch. A minor comment below.
On Mon, Sep 13, 2021 at 11:27 AM Dexuan Cui <decui@xxxxxxxxxxxxx> wrote:
>
> It looks like Hyper-V supports a hardware cursor feature. It is not used
> by Linux VM, but the Hyper-V host still draws a point as an extra mouse
> pointer, which is unwanted, especially when Xorg is running.
>
> The hyperv_fb driver uses synthvid_send_ptr() to hide the unwanted pointer.
> When the hyperv_drm driver was developed, the function synthvid_send_ptr()
> was not copied from the hyperv_fb driver. Fix the issue by adding the
> function into hyperv_drm.
>
> Fixes: 76c56a5affeb ("drm/hyperv: Add DRM driver for hyperv synthetic video device")
> Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
> Cc: Deepak Rawat <drawat.floss@xxxxxxxxx>
> Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/hyperv/hyperv_drm.h | 1 +
> drivers/gpu/drm/hyperv/hyperv_drm_modeset.c | 1 +
> drivers/gpu/drm/hyperv/hyperv_drm_proto.c | 39 ++++++++++++++++++++-
> 3 files changed, 40 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/hyperv/hyperv_drm.h b/drivers/gpu/drm/hyperv/hyperv_drm.h
> index 886add4f9cd0..27bfd27c05be 100644
> --- a/drivers/gpu/drm/hyperv/hyperv_drm.h
> +++ b/drivers/gpu/drm/hyperv/hyperv_drm.h
> @@ -46,6 +46,7 @@ int hyperv_mode_config_init(struct hyperv_drm_device *hv);
> int hyperv_update_vram_location(struct hv_device *hdev, phys_addr_t vram_pp);
> int hyperv_update_situation(struct hv_device *hdev, u8 active, u32 bpp,
> u32 w, u32 h, u32 pitch);
> +int hyperv_send_ptr(struct hv_device *hdev);
> int hyperv_update_dirt(struct hv_device *hdev, struct drm_rect *rect);
> int hyperv_connect_vsp(struct hv_device *hdev);
>
> diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c b/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
> index 3aaee4730ec6..e21c82cf3326 100644
> --- a/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
> +++ b/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
> @@ -101,6 +101,7 @@ static void hyperv_pipe_enable(struct drm_simple_display_pipe *pipe,
> struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
> struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
>
> + hyperv_send_ptr(hv->hdev);
> hyperv_update_situation(hv->hdev, 1, hv->screen_depth,
> crtc_state->mode.hdisplay,
> crtc_state->mode.vdisplay,
> diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_proto.c b/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
> index 6d4bdccfbd1a..1ea7a0432320 100644
> --- a/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
> +++ b/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
> @@ -299,6 +299,40 @@ int hyperv_update_situation(struct hv_device *hdev, u8 active, u32 bpp,
> return 0;
> }
>
> +/* Send mouse pointer info to host */
> +int hyperv_send_ptr(struct hv_device *hdev)
> +{
> + struct synthvid_msg msg;
> +
> + memset(&msg, 0, sizeof(struct synthvid_msg));
> + msg.vid_hdr.type = SYNTHVID_POINTER_POSITION;
> + msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
> + sizeof(struct synthvid_pointer_position);
> + msg.ptr_pos.is_visible = 1;
"is_visible" should be 0 since you want to hide the pointer. Maybe
better, accept these from the caller.
> + msg.ptr_pos.video_output = 0;
> + msg.ptr_pos.image_x = 0;
> + msg.ptr_pos.image_y = 0;
> + hyperv_sendpacket(hdev, &msg);
> +
> + memset(&msg, 0, sizeof(struct synthvid_msg));
> + msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE;
> + msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
> + sizeof(struct synthvid_pointer_shape);
> + msg.ptr_shape.part_idx = SYNTHVID_CURSOR_COMPLETE;
> + msg.ptr_shape.is_argb = 1;
> + msg.ptr_shape.width = 1;
> + msg.ptr_shape.height = 1;
> + msg.ptr_shape.hot_x = 0;
> + msg.ptr_shape.hot_y = 0;
> + msg.ptr_shape.data[0] = 0;
> + msg.ptr_shape.data[1] = 1;
> + msg.ptr_shape.data[2] = 1;
> + msg.ptr_shape.data[3] = 1;
> + hyperv_sendpacket(hdev, &msg);
> +
Is it necessary to send SYNTHVID_POINTER_SHAPE here? Perhaps we should
separate SYNTHVID_POINTER_POSITION and SYNTHVID_POINTER_SHAPE into
different functions.
> + return 0;
> +}
> +
> int hyperv_update_dirt(struct hv_device *hdev, struct drm_rect *rect)
> {
> struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
> @@ -392,8 +426,11 @@ static void hyperv_receive_sub(struct hv_device *hdev)
> return;
> }
>
> - if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE)
> + if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) {
> hv->dirt_needed = msg->feature_chg.is_dirt_needed;
> + if (hv->dirt_needed)
> + hyperv_send_ptr(hv->hdev);
> + }
> }
>
> static void hyperv_receive(void *ctx)
> --
> 2.25.1
>
