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: <20100714104353B.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 14 Jul 2010 10:59:38 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	zpfeffer@...eaurora.org
Cc:	fujita.tomonori@....ntt.co.jp, 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 Tue, 13 Jul 2010 05:14:21 -0700
Zach Pfeffer <zpfeffer@...eaurora.org> wrote:

> > You mean that you want to specify this alignment attribute every time
> > you create an IOMMU mapping? Then you can set segment_boundary_mask
> > every time you create an IOMMU mapping. It's odd but it should work.
> 
> Kinda. I want to forget about IOMMUs, devices and CPUs. I just want to
> create a mapping that has the alignment I specify, regardless of the
> mapper. The mapping is created on a VCM and the VCM is associated with
> a mapper: a CPU, an IOMMU'd device or a direct mapped device.

Sounds like you can do the above with the combination of the current
APIs, create a virtual address and then an I/O address.

The above can't be a reason to add a new infrastructure includes more
than 3,000 lines.
 

> > Another possible solution is extending struct dma_attrs. We could add
> > the alignment attribute to it.
> 
> That may be useful, but in the current DMA-API may be seen as
> redundant info.

If there is real requirement, we can extend the DMA-API.
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