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

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Date:   Fri, 14 Jul 2017 12:01:59 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Kirti Wankhede <kwankhede@...dia.com>,
        "Zhang, Tina" <tina.zhang@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "zhenyuw@...ux.intel.com" <zhenyuw@...ux.intel.com>,
        "chris@...is-wilson.co.uk" <chris@...is-wilson.co.uk>,
        "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>
Subject: Re: [PATCH v10] vfio: ABI for mdev display dma-buf operation

  Hi,

> In case when VFIO region is used to provide surface to QEMU, plane_id
> would be region index,

Then we should name it "region_index" not "plane_id".

> for example region 10 could be used for primary
> surface and region 11 could be used for cursor surface. So in that
> case,
> mdev vendor driver should return plane_type and its corresponding
> plane_id.

Hmm?  plane_type is the input (userspace -> kernel) parameter.

cheers,
  Gerd