[PATCH 2/2] drm/amdgpu: bind GTT on demand

[Andy Furniss]

With current drm-next-4.9-wip plus  drm/amdgpu: fix addr handling in 
amdgpu_vm_bo_update_mapping

testdma is now working OK for my R9285 - just did 35k tests while 
simultaneously running valley/heaven, plus messing with 
powerplay/cpufreq and all is
good, no lock, no vm faults.


Andy Furniss wrote:
> Christian König wrote:
>> Am 22.09.2016 um 23:54 schrieb Andy Furniss:
>>> Marek Olšák wrote:
>>>> This breaks Tonga such that it hangs. Reproducible quickly with:
>>>>
>>>> R600_DEBUG=testdma glxgears
>>>>
>>>> It's a randomized test that runs forever. It should hang within 2
>>>> seconds.
>>>
>>> So what is the status of this now?
>>
>> The status is that I'm hammering my head on the desk for two weeks now
>> what the heck is going wrong here.
>
> Oh, OK, I was just checking no one thought it was fixed really.
>
>>
>> What I've found so far is that a VM update command doesn't have the
>> result it should have, but I absolutely don't understand what happens
>> here.
>>
>> The good news is that it's 100% reproducible and I already found and
>> fixed two bugs.
>>
>> If you have any idea or more testing results what is going wrong here
>> please let me know.
>
> I guess, you already did it anyway or it doesn't help, but
>
> R600_DEBUG=testdma,check_vm glxgears
>
> Does catch a vmfault and output to ddebug_dumps.
> It initially saves me from locking, though I will lock on repeated runs.
>
>>
>> If we can't fix this before the 4.9 release we are just going to revert
>> the patch causing this.
>>
>> Regards,
>> Christian.
>>
>>>
>>> R600_DEBUG=testdma glxgears isn't a test I've run on my r9285 tonga
>>> until I, by luck, saw this.
>>>
>>> On agddf 4.9-wip at post time it did hang/reboot after 2 seconds.
>>>
>>> On every update since it's still hung though now it takes longer.
>>>
>>> Todays update tested both on head and reset on to the drm-next tag
>>> still hang.
>>>
>>> Going back over older 4.9-wips it's one built on 26th August that is
>>> the first not to hang.
>>>
>>>
>>>
>>> _______________________________________________
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>>> amd-gfx at lists.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
>>
>>
>>
>