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

[Andy Furniss]

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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>
>
>