[Bug 91278] Tonga GPU lock/reset fail with Unigine Valley

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91278

--- Comment #43 from Christian König <deathsimple at vodafone.de> ---
(In reply to Alex Deucher from comment #42)
> (In reply to Mathias Tillman from comment #41)
> > Just tried it again with the latest drm-next-4.4 and the kernel parameters
> > amdgpu.enable_scheduler=0 amdgpu.vm_debug=1 amdgpu.enable_semaphores=1.
> 
> I don't think forcing semaphores will work on tonga/fiji since there were
> disabled in the code a while ago due to hw bugs.

Yeah, forcefully enabling semaphores on Tonga will crash rather fast.

The purpose of vm_debug != 0 is to stop after the first VM fault.

So if you got a VM fault from time to time which was just ignored than setting
vm_debug will certainly crash the system.

On the other hand you shouldn't get VM faults in the first place.

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