linux-kernel - Re: [PATCH v2 9/9] xen/gntdev: Expose gntdev's dma-buf API for in-kernel use

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Message-ID: <984bcf75-9bea-aceb-3d3a-62e3c65709c7@gmail.com>
Date:   Wed, 6 Jun 2018 15:46:58 +0300
From:   Oleksandr Andrushchenko <andr2000@...il.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        dongwon.kim@...el.com, matthew.d.roper@...el.com
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        jgross@...e.com, konrad.wilk@...cle.com, daniel.vetter@...el.com,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Subject: Re: [PATCH v2 9/9] xen/gntdev: Expose gntdev's dma-buf API for
 in-kernel use

On 06/05/2018 01:36 AM, Boris Ostrovsky wrote:
> On 06/01/2018 07:41 AM, Oleksandr Andrushchenko wrote:
>> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
>>
>> Allow creating grant device context for use by kernel modules which
>> require functionality, provided by gntdev. Export symbols for dma-buf
>> API provided by the module.
> Can you give an example of who'd be using these interfaces?
There is no use-case at the moment I can think of, but hyper dma-buf 
[1], [2]
I let Intel folks (CCed) to defend this patch as it was done primarily 
for them
and I don't use it in any of my use-cases. So, from this POV it can be 
dropped,
at least from this series.
>
> -boris
>
[1] https://patchwork.freedesktop.org/series/38207/
[2] https://patchwork.freedesktop.org/patch/204447/