Messages in this thread | | | Date | Thu, 30 Oct 2008 07:40:33 +1000 | From | "Dave Airlie" <> | Subject | Re: [PATCH] disable CPU side GART accesses |
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On Thu, Oct 30, 2008 at 7:32 AM, Dave Jones <davej@redhat.com> wrote: > On Thu, Oct 30, 2008 at 07:24:34AM +1000, Dave Airlie wrote: > > > This stops the CPU from using the aperture for most DRI things. I > > can't confirm this won't regress working systems > > though. The whole AMD GART thing scares me, esp if some of the host > > chipsets also have an AGP GART. > > The easy cop-out for those in the past has been 'dont support them'. > It's why we removed some K8 chipset PCI IDs from the via driver for eg. > iirc, if we leave them unprogrammed, they're essentially irrelevant. >
I was more going the other way, why use the IOMMU for AGP when it has other tasks to do, and we have a host chipset GART.
Granted I've never had an AMD + AGP system to ever care about this.
Dave.
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