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: <20100712102435B.fujita.tomonori@lab.ntt.co.jp>
Date:	Mon, 12 Jul 2010 10:25:08 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	zpfeffer@...eaurora.org
Cc:	linux@....linux.org.uk, 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 Thu, 08 Jul 2010 16:59:52 -0700
Zach Pfeffer <zpfeffer@...eaurora.org> wrote:

> The problem I'm trying to solve boils down to this: map a set of
> contiguous physical buffers to an aligned IOMMU address. I need to
> allocate the set of physical buffers in a particular way: use 1 MB
> contiguous physical memory, then 64 KB, then 4 KB, etc. and I need to
> align the IOMMU address in a particular way.

Sounds like the DMA API already supports what you want.

You can set segment_boundary_mask in struct device_dma_parameters if
you want to align the IOMMU address. See IOMMU implementations that
support dma_get_seg_boundary() properly.
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