linux-kernel - Re: [RFC 1/3 v3] mm: iommu: An API to unify IOMMU, CPU and device memory management

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Message-Id: <20100721104356S.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 21 Jul 2010 10:44:37 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	zpfeffer@...eaurora.org
Cc:	linux@....linux.org.uk, fujita.tomonori@....ntt.co.jp,
	ebiederm@...ssion.com, linux-arch@...r.kernel.org,
	dwalker@...eaurora.org, mel@....ul.ie,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, andi@...stfloor.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC 1/3 v3] mm: iommu: An API to unify IOMMU, CPU and device
 memory management

On Tue, 20 Jul 2010 15:20:01 -0700
Zach Pfeffer <zpfeffer@...eaurora.org> wrote:

> > I'm not saying that it's reasonable to pass (or even allocate) a 1MB
> > buffer via the DMA API.
> 
> But given a bunch of large chunks of memory, is there any API that can
> manage them (asked this on the other thread as well)?

What is the problem about mapping a 1MB buffer with the DMA API?

Possibly, an IOMMU can't find space for 1MB but it's not the problem
of the DMA API.
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