[PATCH 1/3] drm/radeon: stop poisoning the GART TLB

[Michel Dänzer]

On 15.06.2014 21:48, Christian König wrote:
> Am 13.06.2014 23:31, schrieb Alex Deucher:
>> On Fri, Jun 13, 2014 at 11:45 AM, Christian König
>> <deathsimple at vodafone.de> wrote:
>>> Hi Marek,
>>>
>>> ah, yes! Piglit in combination with that patch can indeed crash the box.
>>>
>>> Going to investigate now that I can reproduce it.
>> I wonder if it's a clockgating issue with the MC or BIF?  You might
>> try adjusting the rdev->cg_flags (try setting it to 0) in
>> radeon_asic.c or disabling dpm.
> 
> Unfortunately that was just a false alarm.
> 
> I was just on a branch which didn't had the "stop poisoning the GART
> TLB" patch, after applying this patch I can again let piglit run for the
> whole night without a lockup.
> 
> No idea what goes wrong when Marek runs piglit, but 3.15.0+"stop
> poisoning the GART TLB"+"force_gtt" is rock solid here.

FWIW, 3.15 doesn't survive piglit on my Bonaire either, but 3.14 is
fine. 3.15 seems stable on Kaveri though, but I haven't tried the
force_gtt patch on that yet.

There have also been a number of bug reports about stability regressions
in 3.15 on various SI and CIK cards. It seems likely that at least some
of those are related to this issue as well.

If we can't figure out the problem soon, we probably need to revert the
'Use normal BOs for page tables' and dependent changes at least for 3.15.y?


-- 
Earthling Michel Dänzer            |                  http://www.amd.com
Libre software enthusiast          |                Mesa and X developer