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

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Date:   Fri, 14 Jul 2017 14:05:39 +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,

> There could be only two planes, one DRM_PLANE_TYPE_PRIMARY and one
> DRM_PLANE_TYPE_CURSOR.
> Steps from gfx_update for region case would be:
> - VFIO_DEVICE_QUERY_GFX_PLANE with plane_type =
> DRM_PLANE_TYPE_PRIMARY

> - if vfio_device_gfx_plane_info.size > 0, read region for primary
> surface and update console surface

Why?  I suspect you want notify the caller whenever the surface has
been updated or not?  If so we should add an explicit flag or field for
that.

cheers,
  Gerd