linux-kernel - Re: [PATCH] replace CONFIG_IOMMU with CONFIG_GART

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Message-Id: <20080719221750G.fujita.tomonori@lab.ntt.co.jp>
Date:	Sat, 19 Jul 2008 22:17:28 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	joro@...tes.org
Cc:	fujita.tomonori@....ntt.co.jp, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] replace CONFIG_IOMMU with CONFIG_GART_IOMMU in iommu.h

On Sat, 19 Jul 2008 14:49:13 +0200
Joerg Roedel <joro@...tes.org> wrote:

> On Sat, Jul 19, 2008 at 09:12:56PM +0900, FUJITA Tomonori wrote:
> > 
> > I think that we need a common header file (iommu.h or whatever) for
> > what everyone needs, pci_iommu_shutdown(), no_iommu_init(), etc.
> > 
> > Anyway, I did more cleanups:
> > 
> > http://lkml.org/lkml/2008/7/10/510
> > 
> > or
> > 
> > tip/x86/gart
> > 
> > Let me know if you think we still need cleanups.
> 
> Now that you ask, I think the x86 DMA layer in general needs some rework
> and cleanup.

Agreed, I think that every IOMMU developer agrees :)


> The implementation specific free_coherent function is never
> called at the moment for example.

Right, x86 coherent functions need to be fixed. There are some other
areas to improve, I think.


> For paravirtualized DMA we also need
> some kind of stackable dma_ops according to Amit.

Yeah, we need that:

http://marc.info/?t=121117888500001&r=1&w=2

I think that we will need lots of IOMMU (and DMA stuff) work in the
near future.
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