[Bug 28402] random radeon/kms/drm related freezes with kernel 2.6.34

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28402

--- Comment #93 from Da Fox <da_fox at mad.scientist.com> 2010-10-29 05:55:39 PDT ---
(In reply to comment #87)
> (In reply to comment #85)
> > Created an attachment (id=39651)
 View: https://bugs.freedesktop.org/attachment.cgi?id=39651
 Review: https://bugs.freedesktop.org/review?bug=28402&attachment=39651

> > Make sure MC vram map is >= pci aperture size
> > 
> > Ok, I think I found the root cause in this bug.  The vram map in the memory
> > controller needs to be >= the pci aperture size.  For the systems here, the
> > vram size is 64 MB and the aperture size is 128 MB so the vram map in the mc
> > needs to be at least 128 MB.  However, it's getting set to 64 MB.
> 
> I've tested the patch from Comment 79 for over a week now, without any issues
> (as expected). The patch from Comment 82 is quite similar so I assume that
> would work too. I'm going to test this patch now on a fresh 2.6.36.

Ok, I've tested the patch from Comment #85 for the better part of a week now,
and I haven't experienced a single freeze yet. VRAM is still placed directly
after GTT:
---8<---------
Oct 29 08:47:38 localhost kernel: radeon 0000:01:00.0: GTT: 256M 0xD0000000 -
0xDFFFFFFF
Oct 29 08:47:38 localhost kernel: radeon 0000:01:00.0: VRAM: 128M 0xE0000000 -
0xE7FFFFFF (64M used)
Oct 29 08:47:38 localhost kernel: [drm] Detected VRAM RAM=128M, BAR=128M
Oct 29 08:47:38 localhost kernel: [drm] radeon: 64M of VRAM memory ready
Oct 29 08:47:38 localhost kernel: [drm] radeon: 256M of GTT memory ready.
Oct 29 08:47:38 localhost kernel: [drm] vram apper at 0xE0000000
Oct 29 10:42:30 localhost kernel: radeon 0000:01:00.0: GTT: 256M 0xD0000000 -
0xDFFFFFFF
--->8---------
And the VRAM sizes are still a bit confusing (it's listed as 128M with 64M
'used'?)

So I can confirm that this patch indeed fixes the issue. Job well done!

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