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

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Message-ID: <20110428143009.GO17290@n2100.arm.linux.org.uk>
Date:	Thu, 28 Apr 2011 15:30:09 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Arnd Bergmann <arnd@...db.de>, linaro-mm-sig@...ts.linaro.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC] ARM DMA mapping TODO, v1

On Thu, Apr 28, 2011 at 03:56:21PM +0200, Joerg Roedel wrote:
> There is no waste of code, just the opposite. Most of the dma_ops
> implementations that use an IOMMU today have a lot of similiarities in
> their code. All this code (on x86, alpha, sparc, ia64, ...) can
> be unified to a generic solution that fits all (by abstracting the
> differences between iommus into the iommu-api). So the current situation
> is a much bigger code waste than having this unified. The ARM platforms
> supporting iommu hardware will benefit from this as well. It simply
> doesn't make sense to have one dma_ops implementation for each iommu
> hardware around.

I'll defer until there's patches available then - I don't think there's
much value continuing to discuss this until that time.
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