linux-kernel - Re: [PATCH 2/3] [media] videobuf2-dma-streaming: new videobuf2 memory allocator

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Date:	Fri, 24 Aug 2012 15:23:09 +0200
From:	Federico Vaga <federico.vaga@...il.com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	'Mauro Carvalho Chehab' <mchehab@...radead.org>,
	'Pawel Osciak' <pawel@...iak.com>,
	'Hans Verkuil' <hans.verkuil@...co.com>,
	'Giancarlo Asnaghi' <giancarlo.asnaghi@...com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	'Jonathan Corbet' <corbet@....net>,
	Tomasz Stanislawski <t.stanislaws@...sung.local>
Subject: Re: [PATCH 2/3] [media] videobuf2-dma-streaming: new videobuf2 memory allocator

> Getting back to your patch - in your approach cpu cache handling is
> missing. I suspect that it worked fine only because it has been
> tested on some simple platform without any cpu caches (or with very
> small ones).

Is missing from the memory allocator because I do it on the device 
driver. The current operations don't allow me to do that in the memory 
allocator.


> Please check the following thread:
> http://www.spinics.net/lists/linux-media/msg51768.html where Tomasz
> has posted his ongoing effort on updating and extending videobuf2 and
> dma-contig allocator. Especially the patch
> http://www.spinics.net/lists/linux-media/msg51776.html will be
> interesting for you, because cpu cache synchronization
> (dma_sync_single_for_device / dma_sync_single_for_cpu) should be
> called from prepare/finish callbacks.

You are right, it is interesting because avoid me to use cache sync in 
my driver. Can I work on these patches?

>From this page I understand that these patches are not approved yet
https://patchwork.kernel.org/project/linux-media/list/?page=2

-- 
Federico Vaga
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