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

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Date:   Fri, 14 Jul 2017 14:01:08 +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

On Fri, 2017-07-14 at 15:45 +0530, Kirti Wankhede wrote:
> 
> On 7/14/2017 3:31 PM, Gerd Hoffmann wrote:
> >   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.
> > 
> 
> Yes, that's right. Sorry for confusion. And mdev vendor driver would
> return which region to read.

Ok, so the plan for supporting multiple planes is to have a separate
vfio region for each?  Ok, we should add region_index to the struct
then.

cheers,
  Gerd