Regression on gfx8 with ring init

[Tom St Denis]

Odd I couldn't even boot my system with the dGPU as primary after 
rebuilding the kernel.  It got hung up in the IOMMU driver (loads of 
AMD-Vi IOMMU errors) which I wasn't able to capture because it panic'ed 
before loading the network stack.

Bizarre.

I'll keep trying.

Tom

On 2018-09-18 9:35 a.m., Christian König wrote:
> Am 18.09.2018 um 15:32 schrieb Tom St Denis:
>> On 2018-09-18 9:30 a.m., Christian König wrote:
>>> Great, not sure if that is a good or a bad news.
>>>
>>> Anyway going to revert the change for now. Does anybody volunteer to 
>>> figure out why interrupts sometimes doesn't work correctly on Raven?
>>
>> What does "doesn't work correctly?"  My workstation is a Raven1 (Ryzen 
>> 2400G) and other than the TTM bulk move issue has been perfectly 
>> stable (through suspend/resumes too I might add).
>>
>> Anything I could test with my devel raven?
> 
> The problem seems to be that on some boards IH handling doesn't work as 
> it should.
> 
> Can you try to disable the onboard graphics and try again?
> 
> If that still doesn't work there is a DRM_DEBUG in amdgpu_ih_process(), 
> make that a DRM_ERROR and send me the resulting dmesg of loading amdgpu 
> (but don't start any UMD).
> 
> Thanks,
> Christian.
> 
>>
>>
>> Tom
>>
>>>
>>> Christian.
>>>
>>> Am 18.09.2018 um 15:27 schrieb Tom St Denis:
>>>> This commit:
>>>>
>>>> [root at raven linux]# git bisect good
>>>> 9b0df0937a852d299fbe42a5939c9a8a4cc83c55 is the first bad commit
>>>> commit 9b0df0937a852d299fbe42a5939c9a8a4cc83c55
>>>> Author: Christian König <christian.koenig at amd.com>
>>>> Date:   Tue Sep 18 10:38:09 2018 +0200
>>>>
>>>>     drm/amdgpu: remove fence fallback
>>>>
>>>>     DC doesn't seem to have a fallback path either.
>>>>
>>>>     So when interrupts doesn't work any more we are pretty much 
>>>> busted no
>>>>     matter what.
>>>>
>>>>     Signed-off-by: Christian König <christian.koenig at amd.com>
>>>>     Reviewed-by: Chunming Zhou <david1.zhou at amd.com>
>>>>
>>>> Results in this:
>>>>
>>>> [   24.334025] [drm] Initialized amdgpu 3.27.0 20150101 for 
>>>> 0000:07:00.0 on minor 1
>>>> [   24.335674] modprobe (3895) used greatest stack depth: 12600 
>>>> bytes left
>>>> [   26.272358] [drm:gfx_v8_0_ring_test_ib [amdgpu]] *ERROR* amdgpu: 
>>>> IB test timed out.
>>>> [   26.272460] [drm:amdgpu_ib_ring_tests [amdgpu]] *ERROR* amdgpu: 
>>>> failed testing IB on ring 9 (-110).
>>>> [   26.407885] [drm:process_one_work] *ERROR* ib ring test failed 
>>>> (-110).
>>>> [   28.506708] fuse init (API version 7.27)
>>>>
>>>> On init with my polaris/raven1 system.
>>>>
>>>> Cheers,
>>>> Tom
>>>> _______________________________________________
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>>>> amd-gfx at lists.freedesktop.org
>>>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
>>>
>>
>