Re: [Xen-devel] Re: [RFC] Make AGP work with IOMMU

[David Woodhouse <dwmw2@xxxxxxxxxxxxx>]

On Tue, 2009-08-04 at 16:52 -0700, Jeremy Fitzhardinge wrote:
> And just when I have patches to use them for their original purpose...
> 
> Looking back over the thread, are you saying that most users are already
> using the DMA API correctly for AGP accesses?  If that's true then we
> should be just fine.

No, not 'most users'. But perhaps we should.

All we've done so far is make intel-agp use the DMA API correctly. And
that's conditional on CONFIG_DMAR. But we could make it unconditional,
and make the other drivers do it too. The code is all fairly generic.

Without an IOMMU, the overhead would be fairly minimal.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@xxxxxxxxx                              Intel Corporation


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