linux-kernel - Re: [PATCH v10] vfio: ABI for mdev display dma-buf operation

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Date:   Tue, 11 Jul 2017 08:07:43 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Tina Zhang <tina.zhang@...el.com>, alex.williamson@...hat.com,
        chris@...is-wilson.co.uk, zhenyuw@...ux.intel.com,
        zhiyuan.lv@...el.com, zhi.a.wang@...el.com, kevin.tian@...el.com,
        daniel@...ll.ch, kwankhede@...dia.com
Cc:     intel-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10] vfio: ABI for mdev display dma-buf operation

> +/**
> + * VFIO_DEVICE_QUERY_GFX_PLANE - _IOW(VFIO_TYPE, VFIO_BASE + 14,
> + *                           struct vfio_device_query_gfx_plane)
> + * Return: 0 on success, -errno on failure.
> + */
> +
> +struct vfio_device_gfx_plane_info {
> +	__u64 start;
> +	__u64 drm_format_mod;
> +	__u32 drm_format;
> +	__u32 width;
> +	__u32 height;
> +	__u32 stride;
> +	__u32 size;
> +	__u32 x_pos;
> +	__u32 y_pos;
> +};

Do we want keep that as separate struct?  Given we now have only a
single struct using that as sub-struct it looks pointless, at least
from a API point of view.  Does the driver use the struct internally?

> +
> +struct vfio_device_query_gfx_plane {
> +	__u32 argsz;
> +	__u32 flags;
> +	struct vfio_device_gfx_plane_info plane_info;
> +	__u32 plane_type;
> +	__s32 fd; /* dma-buf fd */
> +	__u32 plane_id;

What is plane_id?

cheers,
  Gerd