On Tue, 2005-05-10 at 14:59 -0700, Ian Romanick wrote: > I've started working to get PCI MGA cards, the PCI G450 specifically, > working with DRI. My initial goal is to just get it working with crummy > performance, then improve it by adding support for IOMMUs (to simulate > AGP texturing) on systems like pSeries and AMD64 that have them. > > I've started by digging through the DRI init process in the X.org MGA > DDX. As near as I can tell, the driver uses AGP memory for four things. > To make the PCI cards work, I'll need to make it do without AGP for > these things.
../.. Note that most of these issues can be more easily dealt with if you assume an iommu. What you basically want to do is create a virtual mapping, build an sglist, and have the iommu coalesce that into a single PCI DMA mapping. Unfortunately, the current iommu API doesn't really have a way to enforce the iommu driver to create a single mapping. It will happen most of the time, but can't be enforced. We may have to add something to the DMA APIs to add this ability, or do a quick hack in the meantime as a proof of concept. I could do something for pSeries if you need that. Ben. ------------------------------------------------------- This SF.Net email is sponsored by Oracle Space Sweepstakes Want to be the first software developer in space? Enter now for the Oracle Space Sweepstakes! http://ads.osdn.com/?ad_id=7393&alloc_id=16281&op=click -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
