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Date: Tue, 3 Apr 2012 08:29:54 +0200
Subject: Re: Linux 3.4-rc1
Thread-Topic: Linux 3.4-rc1
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From: Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: Linux 3.4-rc1
Date: Tue, 3 Apr 2012 05:57:26 +0200
Message-ID: 
 <CA+55aFw1ZG9R2MzgXmi0YE64t+xH95QnVuJB55sQ6xgDbnzkyQ@mail.gmail.com>

> On Mon, Apr 2, 2012 at 7:57 PM, Kyungmin Park <kmpark@infradead.org> wrote:
> > On Sun, Apr 1, 2012 at 8:58 AM, Linus Torvalds
> >>
> >>  - DMA-mapping framework. The tree now has a few more acks from
> >> people, and it's largely in the same situation as HSI is: I'll
> >> probably pull, but I really wanted the users who are impacted to
> >> actually talk to me about it.
> >
> > Now Marek and Nvidia persons are used it for DMA mapping based IOMMU.
> >
> > Are there other person who help to merge it?
> > (+CC related persons).
> 
> I want the people who want it to contact me and talk about what they
> do with it. So far, I haven't seen anything.

Nvidia ARM SoC Tegra3 has IOMMU(SMMU), and most of its peripheral
devices can be clients of IOMMU. Their IOMMU'abiblity can be
configured. With DMA-mapping API, we wouldn't have to change any of
device driver code with\without IOMMU, but those 'dma_addr_t' could be
physical address or device virtual address trasparently.