linux-kernel - Re: [PATCH v6 4/6] vfio: Define vfio based vgpu's dma-buf operations

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Date:   Mon, 29 May 2017 09:20:20 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Xiaoguang Chen <xiaoguang.chen@...el.com>,
        alex.williamson@...hat.com, chris@...is-wilson.co.uk,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        zhenyuw@...ux.intel.com, zhiyuan.lv@...el.com,
        intel-gvt-dev@...ts.freedesktop.org, zhi.a.wang@...el.com,
        kevin.tian@...el.com
Subject: Re: [PATCH v6 4/6] vfio: Define vfio based vgpu's dma-buf operations

> +struct vfio_vgpu_dmabuf_info {
> +	__u32 argsz;
> +	__u32 flags;
> +	struct vfio_vgpu_plane_info plane_info;
> +	__s32 fd;
> +	__u32 pad;
> +};

Hmm, now you have argsz and flags twice in vfio_vgpu_dmabuf_info ...

I think we should have something like this:

struct vfio_vgpu_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;
        __u32 padding;
};

struct vfio_vgpu_query_plane {
	__u32 argsz;
	__u32 flags;
	struct vfio_vgpu_plane_info plane_info;
        __u32 plane_id;
        __u32 padding;
};

struct vfio_vgpu_create_dmabuf {
	__u32 argsz;
	__u32 flags;
	struct vfio_vgpu_plane_info plane_info;
        __u32 plane_id;
        __s32 fd;
};