Re: [PATCH] Xen/i386 cleanups - AGP bus/phys cleanups

[Christoph Hellwig]

On Wed, Mar 16, 2005 at 10:01:07AM -0500, Rik van Riel wrote:
> In the case of AGP, the AGPGART effectively _is_ the
> IOMMU.  Calculating the addresses right for programming
> the AGPGART is probably worth fixing.

Well, it's a half-assed one.  And some systems have a real one.

But the real problem is that virt_to_bus doesn't exist at all
on architectures like ppc64, and this patch touches files like
generic.c and backend.c that aren't PC-specific.   So you
effectively break agp support for them.

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