linux-kernel - Re: [PATCH 1/2] arm: msm: Add System MMU support.

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Message-Id: <201007291026.55928.arnd@arndb.de>
Date:	Thu, 29 Jul 2010 10:26:55 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Joerg Roedel <joerg.roedel@....com>
Cc:	stepanm@...eaurora.org, linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org, dwalker@...eaurora.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm: msm: Add System MMU support.

On Thursday 29 July 2010 05:35:48 FUJITA Tomonori wrote:
> > 
> > From what I have been able to tell, the IOMMU interface was written by
> > AMD/Intel to allow the kvm code to work with a common IOMMU interface. To
> 
> Don't confuse the IOMMU interface with the DMA API that Arnd
> mentioned.
> 
> They are not related at all.

Exactly, thanks for the clarification. I also didn't realize that there
is now an include/linux/iommu.h file that only describes the PCI SR-IOV
interfaces, unlike the generic IOMMU support that we have in your
include/linux/dma-mapping.h file.

Maybe we should rename linux/iommu.h to something more specific so we
can reduce this confusion in the future.

	Arnd
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