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

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Date:   Tue, 11 Jul 2017 08:14:08 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Kirti Wankhede <kwankhede@...dia.com>,
        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
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

  Hi,

> > +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;
> > +};
> > +
> 
> It would be better to have comment here about what are expected
> values
> for plane_type and plane_id.

plane_type is DRM_PLANE_TYPE_*.

yes, a comment saying so would be good, same for drm_format which is
DRM_FORMAT_*.  While looking at these two: renaming plane_type to
drm_plane_type (for consistency) is probably a good idea too.

plane_id needs a specification.

cheers,
  Gerd