A query on frame buffers

[Prasad Joshi]

2011/1/7 Konrad Rzeszutek Wilk <konrad.wilk at oracle.com>:
>> > The errors
>> >
>> > [    3.778476] [drm:r100_ring_test] *ERROR* radeon: ring test failed
>> > (sracth(0x15E4)=0xCAFEDEAD)
>> > [    3.781010] [drm:r100_cp_init] *ERROR* radeon: cp isn't working (-22).
>> > [    3.782542] radeon 0000:00:04.0: failled initializing CP (-22).
>> > [    3.784006] radeon 0000:00:04.0: Disabling GPU acceleration
>> >
>> > Seem to be disabling GPU functionality. For now, I am interested in
>> > Graphics functionality of the ATI card and not GPGPU functionality.
>> >
>> > I will appreciate if you can help me with some information on solving
>> > this problem. Let me know if I should be asking this question on
>> > another forum. Please keep me in CC.
>>
>> Looks like dri-devel material, added to CC.
>>
>> As a first guess, maybe the system memory pages accessed by the GPU GART
>> aren't the same ones intended for this by the VM.
>
> I actually have patches for that (sorry for the late reply).
>
> Try:
> git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git devel/ttm.pci-api.v3
>
> But I am not sure if they would make any difference here. You said
> you are using KVM-QEMU - you must also be using an IOMMU? Does the IOMMU
> give you any errors?
>

Yes I want to pass-through the ATI Radeon card to VM in KVM. I have
enabled the IOMMU support and it works perfectly alright. I tried
passing through a network card it worked.

Should I try the patch you suggested?

>