> On 5 Oct 2018, at 14:51, Gerd Hoffmann <kraxel@xxxxxxxxxx> wrote:
>
> The feature allows the guest request an EDID blob (describing monitor
> capabilities) for a given scanout (aka virtual monitor connector).
>
> It brings a new command message, which has just a scanout field (beside
> the standard virtio-gpu header) and a response message which carries the
> EDID data.
>
> Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> ---
> include/uapi/linux/virtio_gpu.h | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/include/uapi/linux/virtio_gpu.h b/include/uapi/linux/virtio_gpu.h
> index f43c3c6171..1cef1ff339 100644
> --- a/include/uapi/linux/virtio_gpu.h
> +++ b/include/uapi/linux/virtio_gpu.h
> @@ -41,6 +41,7 @@
> #include <linux/types.h>
>
> #define VIRTIO_GPU_F_VIRGL 0
> +#define VIRTIO_GPU_F_EDID 1
>
> enum virtio_gpu_ctrl_type {
> VIRTIO_GPU_UNDEFINED = 0,
> @@ -56,6 +57,7 @@ enum virtio_gpu_ctrl_type {
> VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING,
> VIRTIO_GPU_CMD_GET_CAPSET_INFO,
> VIRTIO_GPU_CMD_GET_CAPSET,
> + VIRTIO_GPU_CMD_GET_EDID,
>
> /* 3d commands */
> VIRTIO_GPU_CMD_CTX_CREATE = 0x0200,
> @@ -76,6 +78,7 @@ enum virtio_gpu_ctrl_type {
> VIRTIO_GPU_RESP_OK_DISPLAY_INFO,
> VIRTIO_GPU_RESP_OK_CAPSET_INFO,
> VIRTIO_GPU_RESP_OK_CAPSET,
> + VIRTIO_GPU_RESP_OK_EDID,
>
> /* error responses */
> VIRTIO_GPU_RESP_ERR_UNSPEC = 0x1200,
> @@ -291,6 +294,20 @@ struct virtio_gpu_resp_capset {
> __u8 capset_data[];
> };
>
> +/* VIRTIO_GPU_CMD_GET_EDID */
> +struct virtio_gpu_get_edid {
> + struct virtio_gpu_ctrl_hdr hdr;
> + __le32 scanout;
> +};
> +
> +/* VIRTIO_GPU_RESP_OK_EDID */
> +struct virtio_gpu_resp_edid {
> + struct virtio_gpu_ctrl_hdr hdr;
> + __le32 scanout;
> + __le32 size;
> + __u8 edid[1024];
Wouldn’t it be enough to stick to EDID 2.0 (256 bytes)?
If not, maybe add comment to explain why you chose 1024.
> +};
> +
> #define VIRTIO_GPU_EVENT_DISPLAY (1 << 0)
>
> struct virtio_gpu_config {
> --
> 2.9.3
>
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