linux-kernel - [RFC 0/2] DMA-mapping & IOMMU - physically contiguous allocations

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Message-id: <1350309832-18461-1-git-send-email-m.szyprowski@samsung.com>
Date:	Mon, 15 Oct 2012 16:03:50 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	linux-arm-kernel@...ts.infradead.org,
	linaro-mm-sig@...ts.linaro.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Arnd Bergmann <arnd@...db.de>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Inki Dae <inki.dae@...sung.com>, Rob Clark <rob@...com>
Subject: [RFC 0/2] DMA-mapping & IOMMU - physically contiguous allocations

Hello,

Some devices, which have IOMMU, for some use cases might require to
allocate a buffers for DMA which is contiguous in physical memory. Such
use cases appears for example in DRM subsystem when one wants to improve
performance or use secure buffer protection.

I would like to ask if adding a new attribute, as proposed in this RFC
is a good idea? I feel that it might be an attribute just for a single
driver, but I would like to know your opinion. Should we look for other
solution?

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


Marek Szyprowski (2):
  common: DMA-mapping: add DMA_ATTR_FORCE_CONTIGUOUS attribute
  ARM: dma-mapping: add support for DMA_ATTR_FORCE_CONTIGUOUS attribute

 Documentation/DMA-attributes.txt |    9 +++++++++
 arch/arm/mm/dma-mapping.c        |   41 ++++++++++++++++++++++++++++++--------
 include/linux/dma-attrs.h        |    1 +
 3 files changed, 43 insertions(+), 8 deletions(-)

-- 
1.7.9.5

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