[Nouveau] [Bug 108980] GF117: MMIO write of 0000001f FAULT at 6013d4 [ IBUS ]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108980

--- Comment #5 from Ilia Mirkin <imirkin at alum.mit.edu> ---
This is quite confusing. It would appear it's happening in volt's oneinit
function:

[   17.475047] kernel: nouveau 0000:08:00.0: volt: init running...
[   17.475749] kernel: nouveau 0000:08:00.0: volt: one-time init running...
[   17.476499] kernel: nouveau 0000:08:00.0: volt: couldn't find speedo value,
volting not possible
[   17.476513] kernel: nouveau 0000:08:00.0: bus: MMIO write of ffff881f FAULT
at 6013d4 [ IBUS ]
[   17.477150] kernel: nouveau 0000:08:00.0: volt: one-time init completed in
668us
[   17.478504] kernel: nouveau 0000:08:00.0: volt: current voltage unknown
[   17.479174] kernel: nouveau 0000:08:00.0: volt: init completed in 3426us

However nothing in there could cause that... of course the notification only
comes in later (via interrupt servicing), so it may not be directly correlated
to these messages.

Auditing the other common suspects, nothing in the bios will try to use any of
the IO/etc commands which generally trigger these.

AHA! I have a theory.

devinit's preinit calls nvkm_lockvgac(). Can you try commenting that out?

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/base.c:nvkm_devinit_preinit -- just
comment out the call to "nvkm_lockvgac".

If that doesn't help, then I'm out of ideas, and we have to take more of a
shotgun approach -- add a

WARN() at the top of drivers/gpu/drm/nouveau/nvkm/engine/disp/vga.c:nvkm_wrport
and rdport, and see who's calling them. No one should be on a GF117, I believe.

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