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

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Message-ID: <93758f79-8076-9644-a8a7-6e2ebfd91fee@nvidia.com>
Date:   Wed, 31 May 2017 22:52:50 +0530
From:   Kirti Wankhede <kwankhede@...dia.com>
To:     "Chen, Xiaoguang" <xiaoguang.chen@...el.com>,
        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



On 5/31/2017 11:48 AM, Chen, Xiaoguang wrote:
> 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 :)
> 

Can you define what are the expected values of 'flags' would be?

Thanks,
Kirti

> Chenxg.
>