linux-kernel - Re: [PATCH v4 8/9] xen/gntdev: Implement dma-buf export functionality

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Date:   Fri, 15 Jun 2018 17:02:23 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Oleksandr Andrushchenko <andr2000@...il.com>,
        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
Cc:     daniel.vetter@...el.com, dongwon.kim@...el.com,
        matthew.d.roper@...el.com,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Subject: Re: [PATCH v4 8/9] xen/gntdev: Implement dma-buf export functionality

On 06/15/2018 02:27 AM, Oleksandr Andrushchenko wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
>
> 1. Create a dma-buf from grant references provided by the foreign
>    domain. By default dma-buf is backed by system memory pages, but
>    by providing GNTDEV_DMA_FLAG_XXX flags it can also be created
>    as a DMA write-combine/coherent buffer, e.g. allocated with
>    corresponding dma_alloc_xxx API.
>    Export the resulting buffer as a new dma-buf.
>
> 2. Implement waiting for the dma-buf to be released: block until the
>    dma-buf with the file descriptor provided is released.
>    If within the time-out provided the buffer is not released then
>    -ETIMEDOUT error is returned. If the buffer with the file descriptor
>    does not exist or has already been released, then -ENOENT is
>    returned. For valid file descriptors this must not be treated as
>    error.
>
> 3. Make gntdev's common code and structures available to dma-buf.
>
> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>