linux-kernel - Re: [Linaro-mm-sig] [RFC v2 1/2] dma-buf: Introduce dma buffer sharing mechanism

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Message-ID: <CAF6AEGtGR0-vtfrP4i++kBxb2wGgGzv2MDu-K3CjmhEBXQyDnA@mail.gmail.com>
Date:	Fri, 23 Dec 2011 11:10:07 -0600
From:	Rob Clark <robdclark@...il.com>
To:	"Semwal, Sumit" <sumit.semwal@...com>
Cc:	Arnd Bergmann <arnd@...db.de>, Daniel Vetter <daniel@...ll.ch>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, linux@....linux.org.uk,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org, linux-mm@...ck.org,
	linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [Linaro-mm-sig] [RFC v2 1/2] dma-buf: Introduce dma buffer
 sharing mechanism

On Fri, Dec 23, 2011 at 4:00 AM, Semwal, Sumit <sumit.semwal@...com> wrote:
> On Wed, Dec 21, 2011 at 10:57 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> On Tuesday 20 December 2011, Daniel Vetter wrote:
>>> > I'm thinking for a first version, we can get enough mileage out of it by saying:
>>> > 1) only exporter can mmap to userspace
>>> > 2) only importers that do not need CPU access to buffer..
>
> Thanks Rob - and the exporter can do the mmap outside of dma-buf
> usage, right?

Yes

> I mean, we don't need to provide an mmap to dma_buf()
> and restrict it to exporter, when the exporter has more 'control' of
> the buffer anyways.

No, if it is only for the exporter, it really doesn't need to be in
dmabuf (ie. the exporter already knows how he is)

BR,
-R

>>
> BR,
> ~Sumit.
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