Re: [PATCH v13 5/7] vfio: ABI for mdev display dma-buf operation

[Gerd Hoffmann <kraxel@redhat.com>]

  Hi,

> +/**
> + * VFIO_DEVICE_QUERY_GFX_PLANE - _IOW(VFIO_TYPE, VFIO_BASE + 14,
> struct vfio_device_query_gfx_plane)
> + *
> + * Set the drm_plane_type and retrieve information about the gfx
> plane.
+ *
> + * Return: 0 on success, -errno on failure.

I think this should be more verbose, especially documenting that the
"guest driver didn't initialize the display yet" case isn't and error
and fields should be set to zero then (as discussed on the list).

> + */
> +struct vfio_device_gfx_plane_info {
> +	__u32 argsz;
> +	__u32 flags;
> +	/* in */
> +	__u32 drm_plane_type;	/* type of plane:
> DRM_PLANE_TYPE_* */
> +	/* out */
> +	__u32 drm_format;	/* drm format of plane */
> +	__u64 drm_format_mod;   /* tiled mode */
> +	__u32 width;	/* width of plane */
> +	__u32 height;	/* height of plane */
> +	__u32 stride;	/* stride of plane */
> +	__u32 size;	/* size of plane in bytes, align on
> page*/
> +	__u32 x_pos;	/* horizontal position of cursor plane,
> upper left corner in pixels */
> +	__u32 y_pos;	/* vertical position of cursor plane,
> upper left corner in lines*/
> +	__u32 region_index;
> +	__s32 fd;	/* dma-buf fd */
> +};

Looks good to me.

Unfortunately I havn't been able to test the whole series yet due to
being busy with other stuff, and I'm about to leave for my summer
vacation.  Will be back online on Aug 21st.

cheers,
  Gerd


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