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

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Message-Id: <20100802181919J.fujita.tomonori@lab.ntt.co.jp>
Date:	Mon, 2 Aug 2010 18:20:01 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	linux@....linux.org.uk
Cc:	fujita.tomonori@....ntt.co.jp, benh@...nel.crashing.org,
	dwalker@...eaurora.org, arnd@...db.de, Joerg.Roedel@....com,
	linux-kernel@...r.kernel.org, stepanm@...eaurora.org,
	linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] arm: msm: Add System MMU support.

On Mon, 2 Aug 2010 10:03:26 +0100
Russell King - ARM Linux <linux@....linux.org.uk> wrote:

> On Mon, Aug 02, 2010 at 05:30:26PM +0900, FUJITA Tomonori wrote:
> > ARM's iommu code (arch/plat-omap/include/plat/iommu.h) is a library to
> > simplify the IOMMU implementations. It could be useful for all the
> > iommu implementations.
> 
> ITYM OMAP's iommu code.

Yeah, I meant that we could extend it to make it useful for other
iommu implementations. At least, we could make something generic like
struct iommu_functions, I think. Then we can embed a generic iommu
structure into an iommu specific struct (like we do with inode).

The current iommu-api (include/linux/iommu.h) is just about domain and
mapping concept. We can implement it on the top of the above
infrastructure.

I'm still trying to figure out how the DMA-API can work well with
them.
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