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

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Date:   Wed, 31 May 2017 06:18:53 +0000
From:   "Chen, Xiaoguang" <xiaoguang.chen@...el.com>
To:     Gerd Hoffmann <kraxel@...hat.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "chris@...is-wilson.co.uk" <chris@...is-wilson.co.uk>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "zhenyuw@...ux.intel.com" <zhenyuw@...ux.intel.com>,
        "Lv, Zhiyuan" <zhiyuan.lv@...el.com>,
        "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "Wang, Zhi A" <zhi.a.wang@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>
Subject: RE: [PATCH v6 4/6] vfio: Define vfio based vgpu's dma-buf operations

Hi,

>-----Original Message-----
>From: Gerd Hoffmann [mailto:kraxel@...hat.com]
>Sent: Monday, May 29, 2017 3:20 PM
>To: Chen, Xiaoguang <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; Lv, Zhiyuan <zhiyuan.lv@...el.com>; intel-gvt-
>dev@...ts.freedesktop.org; Wang, Zhi A <zhi.a.wang@...el.com>; Tian, Kevin
><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;
>};
Good suggestion will apply in the next version.
Thanks for review :)

Chenxg.