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.
-- Keir
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