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

[Christoph Hellwig]

On Wed, Mar 16, 2005 at 06:35:28PM +0000, Keir Fraser wrote:
> 
> On 16 Mar 2005, at 18:10, Christoph Hellwig wrote:
> 
> >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.
> 
> The AGP driver is only configurable for ppc32, alpha, x86, x86_64 and 
> ia64, all of which have virt_to_bus.

and ppc64 now, which doesn't.

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