linux-kernel - Re: [Linaro-mm-sig] [RFC] ARM DMA mapping TODO, v1

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Message-ID: <1304036962.2513.202.camel@pasglop>
Date:	Fri, 29 Apr 2011 10:29:22 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Jerome Glisse <j.glisse@...il.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	linaro-mm-sig@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [Linaro-mm-sig] [RFC] ARM DMA mapping TODO, v1

On Thu, 2011-04-28 at 15:37 -0400, Jerome Glisse wrote:
> Jesse also pointed out space exhaustion inside the iommu and i believe
> this should also be considered. This is why i believe the dma_* api is
> not well suited. In DRM/TTM we use  pci_dma_mapping* and we also play
> with with page set_page*_uc|wc|wb.

Which are yet another set of completely x86-centric APIs that have not
been thought in the context of other architectures and are probably
mostly unimplementables on half of them :-)

Cheers,
Ben.


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