linux-kernel - Re: [Intel-gfx] [PATCH v9 5/7] vfio: Define vfio based dma-buf operations

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Message-ID: <1498457848.20591.4.camel@redhat.com>
Date:   Mon, 26 Jun 2017 08:17:28 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     "Zhang, Tina" <tina.zhang@...el.com>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kirti Wankhede <kwankhede@...dia.com>,
        "Chen, Xiaoguang" <xiaoguang.chen@...el.com>,
        "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "Lv, Zhiyuan" <zhiyuan.lv@...el.com>,
        "Wang, Zhi A" <zhi.a.wang@...el.com>,
        "Wang, Zhenyu Z" <zhenyu.z.wang@...el.com>
Subject: Re: [Intel-gfx] [PATCH v9 5/7] vfio: Define vfio based dma-buf
 operations

  Hi,

> > So maybe a "enum plane_state" (instead of "bool is_enabled")?  So
> > we
> > can clearly disturgish ENABLED, DISABLED, NOT_SUPPORTED cases?
> 
> What's the difference between NOT_SUPPORTED and -ENOTTY on the ioctl?
> Perhaps a bit in a flags field could specify EN/DIS-ABLED and leave
> room for things we're forgetting.

So throw error in the NOT_SUPPORTED case, otherwise set/clear a
PLANE_ENABLED bit in flags?

Yep, that will work too.

cheers,
  Gerd