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Re: [Xen-devel] Re: [drm:r100_ring_test] *ERROR* radeon: ring test failed

On Tue, Oct 27, 2009 at 05:46:51PM +0200, Pasi Kärkkäinen wrote:
> On Wed, Oct 21, 2009 at 02:31:30PM -0400, Konrad Rzeszutek Wilk wrote:
> > > I updated the pv_ops dom0 git tree to the latest tree as of
> > > today, and also applied your ttm.patch.
> > > 
> > > Modesetting works now, and there are no drm/radeon errors.
> > 
> > Thank you for testing it.
> > 
> Btw are you going to post this for inclusion in drm/ttm trees?

I am not really comfortable with it. It has the same drawbacks
as the fix for the drm_scatter, where we blindly assume
phys_to_bus(virt_to_phys(X)) will give us the same value as
what dma_alloc_coherent provides. We should save that bus address

Saving it somewhere (perhaps in some of the structs the drm_ttm allocates)
could do it. But we should probably differentiate between memory
that is being allocated for DMA transfers vs other things so that
we don't over-exercise the dma_alloc_coherent. Thought maybe
the memory returned via drm_tt calls are only used for DMA transfers.

We can figure this out.  Pasi, I don't have a modesetting working machine,
but you do. Can you compile your pv_ops with the fix I provided earlier,
along with enabling CONFIG_DMA_API_DEBUG=y. Once mode-setting is turned
on and your machine is humming along (maybe even run glxgears), compile
the attached module and load it. You should get a kernel dump
off all devices that are using the DMA buffers. Can you e-mail me that back

Attachment: Makefile
Description: Text document

Attachment: dump_dma.c
Description: Text document

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