linux-kernel - RE: [PATCH 7/7] ARM: integrate CMA with DMA-mapping subsystem

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Message-id: <000201cc8432$d642b930$82c82b90$%szyprowski@samsung.com>
Date:	Thu, 06 Oct 2011 16:18:36 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	linaro-mm-sig@...ts.linaro.org
Cc:	'Michal Nazarewicz' <mina86@...a86.com>,
	'Kyungmin Park' <kyungmin.park@...sung.com>,
	'Russell King' <linux@....linux.org.uk>,
	'Andrew Morton' <akpm@...ux-foundation.org>,
	'KAMEZAWA Hiroyuki' <kamezawa.hiroyu@...fujitsu.com>,
	'Ankita Garg' <ankita@...ibm.com>,
	'Daniel Walker' <dwalker@...eaurora.org>,
	'Mel Gorman' <mel@....ul.ie>, 'Arnd Bergmann' <arnd@...db.de>,
	'Jesse Barker' <jesse.barker@...aro.org>,
	'Jonathan Corbet' <corbet@....net>,
	'Shariq Hasnain' <shariq.hasnain@...aro.org>,
	'Chunsang Jeong' <chunsang.jeong@...aro.org>,
	'Dave Hansen' <dave@...ux.vnet.ibm.com>
Subject: RE: [PATCH 7/7] ARM: integrate CMA with DMA-mapping subsystem

Hello,

On Thursday, October 06, 2011 3:55 PM Marek Szyprowski wrote:

> This patch adds support for CMA to dma-mapping subsystem for ARM
> architecture. By default a global CMA area is used, but specific devices
> are allowed to have their private memory areas if required (they can be
> created with dma_declare_contiguous() function during board
> initialization).
> 
> Contiguous memory areas reserved for DMA are remapped with 2-level page
> tables on boot. Once a buffer is requested, a low memory kernel mapping
> is updated to to match requested memory access type.
> 
> GFP_ATOMIC allocations are performed from special pool which is created
> early during boot. This way remapping page attributes is not needed on
> allocation time.
> 
> CMA has been enabled unconditionally for ARMv6+ systems.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>

Please ignore this patch. The patch named as "[PATCH 8/9] ARM: integrate
CMA with DMA-mapping subsystem" in this thread is the correct one.

Best regards
-- 
Marek Szyprowski
Samsung Poland R&D Center

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