linux-kernel - RE: [PATCH v16 5/6] vfio: ABI for mdev display dma-buf operation

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Date:   Tue, 7 Nov 2017 05:00:53 +0000
From:   "Zhang, Tina" <tina.zhang@...el.com>
To:     Alex Williamson <alex.williamson@...hat.com>,
        Gerd Hoffmann <kraxel@...hat.com>
CC:     "Tian, Kevin" <kevin.tian@...el.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "joonas.lahtinen@...ux.intel.com" <joonas.lahtinen@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "zhenyuw@...ux.intel.com" <zhenyuw@...ux.intel.com>,
        "chris@...is-wilson.co.uk" <chris@...is-wilson.co.uk>,
        "kwankhede@...dia.com" <kwankhede@...dia.com>,
        "Lv, Zhiyuan" <zhiyuan.lv@...el.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "Wang, Zhi A" <zhi.a.wang@...el.com>
Subject: RE: [PATCH v16 5/6] vfio: ABI for mdev display dma-buf operation



> -----Original Message-----
> From: Alex Williamson [mailto:alex.williamson@...hat.com]
> Sent: Tuesday, November 7, 2017 4:37 AM
> To: Gerd Hoffmann <kraxel@...hat.com>
> Cc: Zhang, Tina <tina.zhang@...el.com>; Tian, Kevin <kevin.tian@...el.com>;
> Daniel Vetter <daniel.vetter@...ll.ch>; intel-gfx@...ts.freedesktop.org;
> joonas.lahtinen@...ux.intel.com; linux-kernel@...r.kernel.org;
> zhenyuw@...ux.intel.com; chris@...is-wilson.co.uk; kwankhede@...dia.com;
> Lv, Zhiyuan <zhiyuan.lv@...el.com>; daniel@...ll.ch; intel-gvt-
> dev@...ts.freedesktop.org; Wang, Zhi A <zhi.a.wang@...el.com>
> Subject: Re: [PATCH v16 5/6] vfio: ABI for mdev display dma-buf operation
> 
> On Mon, 06 Nov 2017 10:05:34 +0100
> Gerd Hoffmann <kraxel@...hat.com> wrote:
> 
> >   Hi,
> >
> > > > I thought we had agreed to make this behave similar to
> > > > VFIO_GROUP_GET_DEVICE_FD, the ioctl would take a __u32 dmabuf_id
> > > > and return the file descriptor as the ioctl return value.  Thanks,
> > >
> > > If we follow VFIO_GROUP_GET_DEVICE_FD, we would lose flags
> > > functionality.
> > > Zhi and Zhenyu, how do you think about it?
> >
> > The ioctl is simple enough that not having flags should not be a
> > problem I think.
> >
> > Also note that dmabuf_id is received using the PLANE_INFO ioctl, so
> > should the need arise to negotiate something in the future chances are
> > high that it can be done using the PLANE_INFO ioctl flags.
> 
> Right, the ioctl is "get fd for thing" so we have control of "thing".
> I think we had this same discussion on v15.  Thanks,
Then, OK. Thanks.

BR,
Tina
> 
> Alex