linux-kernel - Re: [PATCH 5/8] xen/gntdev: Add initial support for dma-buf UAPI

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Message-ID: <232459a8-695f-56bf-e39b-693a2d2b27e3@oracle.com>
Date:   Tue, 29 May 2018 18:34:14 -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 5/8] xen/gntdev: Add initial support for dma-buf UAPI

On 05/25/2018 11:33 AM, Oleksandr Andrushchenko wrote:

>  
> +/*
> + * Create a dma-buf [1] from grant references @refs of count @count provided
> + * by the foreign domain @domid with flags @flags.
> + *
> + * By default dma-buf is backed by system memory pages, but by providing
> + * one of the GNTDEV_DMA_FLAG_XXX flags it can also be created as
> + * a DMA write-combine or coherent buffer, e.g. allocated with dma_alloc_wc/
> + * dma_alloc_coherent.
> + *
> + * Returns 0 if dma-buf was successfully created and the corresponding
> + * dma-buf's file descriptor is returned in @fd.
> + *
> + * [1] https://elixir.bootlin.com/linux/latest/source/Documentation/driver-api/dma-buf.rst


Documentation/driver-api/dma-buf.rst.


-boris