Nouveau - Dec 2018 - [Bug 108980] New: GF117: MMIO write of 0000001f FAULT at 6013d4 [ IBUS ]

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

            Bug ID: 108980
           Summary: GF117: MMIO write of 0000001f FAULT at 6013d4 [ IBUS ]
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: adamos at hell.factory.net.pl
        QA Contact: xorg-team at lists.x.org

Kernel 4.10 and next, till the last:

# dmesg | grep nouveau
[   15.161745] nouveau: detected PR support, will not use DSM
[   15.163013] nouveau 0000:08:00.0: enabling device (0006 -> 0007)
[   15.164408] nouveau 0000:08:00.0: NVIDIA GF117 (0d7000a2)
[   15.186628] nouveau 0000:08:00.0: bios: version 75.17.86.00.04
[   15.271378] nouveau 0000:08:00.0: fb: 2048 MiB DDR3
[   15.289248] nouveau 0000:08:00.0: volt: couldn't find speedo value,
volting
not possible
[   15.289262] nouveau 0000:08:00.0: bus: MMIO write of 0000001f FAULT at
6013d4 [ IBUS ]
[   15.935388] nouveau 0000:08:00.0: DRM: VRAM: 2048 MiB
[   15.936749] nouveau 0000:08:00.0: DRM: GART: 1048576 MiB
[   15.938436] nouveau 0000:08:00.0: DRM: Pointer to TMDS table invalid
[   15.939583] nouveau 0000:08:00.0: DRM: DCB version 4.0
[   15.942999] nouveau 0000:08:00.0: DRM: MM: using COPY0 for buffer copies
[   15.944156] [drm] Initialized nouveau 1.3.1 20120801 for 0000:08:00.0 on
minor 1

Before kernel 4.10.x
(in this example 4.9.140):

# dmesg | grep nouveau
[   15.755065] nouveau: detected PR support, will not use DSM
[   15.756863] nouveau 0000:08:00.0: enabling device (0006 -> 0007)
[   15.758852] nouveau 0000:08:00.0: NVIDIA GF117 (0d7000a2)
[   15.785141] nouveau 0000:08:00.0: bios: version 75.17.86.00.04
[   15.868828] nouveau 0000:08:00.0: fb: 2048 MiB DDR3
[   16.510223] nouveau 0000:08:00.0: DRM: VRAM: 2048 MiB
[   16.510227] nouveau 0000:08:00.0: DRM: GART: 1048576 MiB
[   16.510232] nouveau 0000:08:00.0: DRM: Pointer to TMDS table invalid
[   16.510236] nouveau 0000:08:00.0: DRM: DCB version 4.0
[   16.510240] nouveau 0000:08:00.0: DRM: Pointer to flat panel table invalid
[   16.640514] nouveau 0000:08:00.0: DRM: MM: using COPY0 for buffer copies
[   16.640527] [drm] Initialized nouveau 1.3.1 20120801 for 0000:08:00.0 on
minor 1
[   22.007459] nouveau 0000:08:00.0: DRM: evicting buffers...
[   22.008617] nouveau 0000:08:00.0: DRM: waiting for kernel channels to go
idle...
[   22.009842] nouveau 0000:08:00.0: DRM: suspending client object trees...
[   22.011334] nouveau 0000:08:00.0: DRM: suspending kernel object tree...

Hardware:

Dell Inspiron 3542 (0652).

# lspci -vvv
08:00.0 3D controller: NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M /
GT 620M/625M/630M/720M] (rev a1)
        Subsystem: Dell GeForce 820M
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 49
        Region 0: Memory at f6000000 (32-bit, non-prefetchable) [size=16M]
        Region 1: Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Region 3: Memory at f0000000 (64-bit, prefetchable) [size=32M]
        Region 5: I/O ports at d000 [size=128]
        Expansion ROM at f7000000 [disabled] [size=512K]
        Capabilities: [60] Power Management version 3
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
                Address: 00000000fee003b8  Data: 0000
        Capabilities: [78] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s
unlimited, L1 <64us
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
SlotPowerLimit 25.000W
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
                        RlxdOrd- ExtTag+ PhantFunc- AuxPwr- NoSnoop+
                        MaxPayload 128 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr-
TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x8, ASPM L0s L1, Exit
Latency L0s <512ns, L1 <4us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x4, TrErr- Train- SlotClk+
DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range AB, TimeoutDis+, LTR-, OBFF
Not Supported
                         AtomicOpsCap: 32bit- 64bit- 128bitCAS-
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-,
OBFF Disabled
                         AtomicOpsCtl: ReqEn-
                LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
                         Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
                         Compliance De-emphasis: -6dB
                LnkSta2: Current De-emphasis Level: -6dB,
EqualizationComplete-, EqualizationPhase1-
                         EqualizationPhase2-, EqualizationPhase3-,
LinkEqualizationRequest-
        Capabilities: [b4] Vendor Specific Information: Len=14 <?>
        Capabilities: [100 v1] Virtual Channel
                Caps:   LPEVC=0 RefClk=100ns PATEntryBits=1
                Arb:    Fixed- WRR32- WRR64- WRR128-
                Ctrl:   ArbSelect=Fixed
                Status: InProgress-
                VC0:    Caps:   PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
                        Arb:    Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
                        Ctrl:   Enable+ ID=0 ArbSelect=Fixed TC/VC=01
                        Status: NegoPending- InProgress-
        Capabilities: [128 v1] Power Budgeting <?>
        Capabilities: [600 v1] Vendor Specific Information: ID=0001 Rev=1
Len=024 <?>
        Kernel driver in use: nouveau
        Kernel modules: nouveau

Distribution: Fedora, Gentoo

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

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
GF117 doesn't have a display unit. Looks like something is writing to the
VGA
registers anyways.

No real harm, but we should avoid it.

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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Could you include your vbios (easiest to grab it from
/sys/kernel/debug/dri/*/vbios.rom)?

Also a boot with nouveau.debug=trace would help narrow down the source, even if
it's not the bios init logic.

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--- Comment #3 from Johnny B. Goode <adamos at hell.factory.net.pl> ---
Created attachment 142760
  --> https://bugs.freedesktop.org/attachment.cgi?id=142760&action=edit
nouveau debug

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--- Comment #4 from Johnny B. Goode <adamos at hell.factory.net.pl> ---
Created attachment 142761
  --> https://bugs.freedesktop.org/attachment.cgi?id=142761&action=edit
GF117 rom

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--- 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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--- Comment #6 from Johnny B. Goode <adamos at hell.factory.net.pl> ---
After commenting out "nvkm_lockvgac"

dmesg | grep nouveau
[   15.460433] nouveau: detected PR support, will not use DSM
[   15.460460] nouveau 0000:08:00.0: enabling device (0006 -> 0007)
[   15.542557] nouveau 0000:08:00.0: NVIDIA GF117 (0d7000a2)
[   15.572939] nouveau 0000:08:00.0: bios: version 75.17.86.00.04
[   15.656684] nouveau 0000:08:00.0: fb: 2048 MiB DDR3
[   15.674657] nouveau 0000:08:00.0: volt: couldn't find speedo value,
volting
not possible
[   15.674671] nouveau 0000:08:00.0: bus: MMIO read of 00000000 FAULT at 084048
[ IBUS ]
[   16.325269] nouveau 0000:08:00.0: DRM: VRAM: 2048 MiB
[   16.326428] nouveau 0000:08:00.0: DRM: GART: 1048576 MiB
[   16.327626] nouveau 0000:08:00.0: DRM: Pointer to TMDS table invalid
[   16.328896] nouveau 0000:08:00.0: DRM: DCB version 4.0
[   16.331925] nouveau 0000:08:00.0: DRM: MM: using COPY0 for buffer copies
[   16.333193] [drm] Initialized nouveau 1.3.1 20120801 for 0000:08:00.0 on
minor 1

Now it is MMIO read of 00000000 FAULT at 084048 [ IBUS ]

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--- Comment #7 from Ilia Mirkin <imirkin at alum.mit.edu> ---
OK, I see what's going on. This is going to be a game of whack-a-mole.

We make a bunch of MMIO accesses to "illegal" areas. The
"error" buffer is only
1-deep, i.e. it keeps track of only the last one. When we enable reporting, it
reports whichever was the first, or the last such error. With the vga write
fixed, now it's something else.

84048 is PVLD.ACCESS_EN. I guess we're accessing it before it's enabled?
It
looks like this is coming from nvkm_falcon_fini (which is, counter-intuitively,
called as part of the initialization flow).

The logic in core/subdev.c is to first run ->fini() and then do
nvkm_mc_reset()
which will turn off-then-on the bit that enables the engine.

Ben - what's the proper way to deal with this? Tweak PMC.ENABLE in
nvkm_device_fini? [We could always just clear out those errors before first
enabling the bus intr reporting, but that would just be sticking our heads in
the sand...]

In the meanwhile, I'll work on a proper patch for the vgalock thing.

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--- Comment #8 from Ilia Mirkin <imirkin at alum.mit.edu> ---
... and of course fixing that vga thing isn't as easy as it looks.

nvkm_device_preinit first calls all the preinit's and THEN computes the
disable
mask. So when nvkm_devinit_preinit runs, it won't have the disable mask that
tells it that the display unit is fused off.

And unfortunately I don't know why that logic is there in the first place,
so
this is one for Ben as well. Perhaps it's a holdover from the time of the
ancients, and can be restricted to family < NV_50 entirely?

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--- Comment #9 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Created attachment 142783
  --> https://bugs.freedesktop.org/attachment.cgi?id=142783&action=edit
avoid touching falcon registers on fini

See what triggers this next. (Keep your lockvga patch in place too. Still
working on that one.)

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--- Comment #10 from Johnny B. Goode <adamos at hell.factory.net.pl> ---
It's like chasing rabbits.

dmesg | grep nouveau
[   14.869172] nouveau: detected PR support, will not use DSM
[   14.869201] nouveau 0000:08:00.0: enabling device (0006 -> 0007)
[   14.979493] nouveau 0000:08:00.0: NVIDIA GF117 (0d7000a2)
[   15.005578] nouveau 0000:08:00.0: bios: version 75.17.86.00.04
[   15.089370] nouveau 0000:08:00.0: fb: 2048 MiB DDR3
[   15.106637] nouveau 0000:08:00.0: volt: couldn't find speedo value,
volting
not possible
[   15.106651] nouveau 0000:08:00.0: bus: MMIO read of 00000000 FAULT at 0212cc
[ IBUS ]
[   15.753323] nouveau 0000:08:00.0: DRM: VRAM: 2048 MiB
[   15.754432] nouveau 0000:08:00.0: DRM: GART: 1048576 MiB
[   15.755693] nouveau 0000:08:00.0: DRM: Pointer to TMDS table invalid
[   15.756797] nouveau 0000:08:00.0: DRM: DCB version 4.0
[   15.760007] nouveau 0000:08:00.0: DRM: MM: using COPY0 for buffer copies
[   15.761582] [drm] Initialized nouveau 1.3.1 20120801 for 0000:08:00.0 on
minor 1

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--- Comment #11 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Johnny B. Goode from comment #10)
> [   15.106637] nouveau 0000:08:00.0: volt: couldn't find speedo value,
> volting not possible
> [   15.106651] nouveau 0000:08:00.0: bus: MMIO read of 00000000 FAULT at
> 0212cc [ IBUS ]
$ lookup -a d7 212cc
PFUSE.FUSES.SPEEDO => 0

Ben - do we need to enable something more? We're going through
gf100_fuse_read,
which is pretty careful about enabling / disabling fuses around the read. Is
fuse 0x1cc just not available on GF117?

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--- Comment #12 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Created attachment 142798
  --> https://bugs.freedesktop.org/attachment.cgi?id=142798&action=edit
fix gf117 volt speedo fuse id

Legit bug here -- looks like the speedo fuse moved on GF117 to the kepler
location. (Still in the old place on GF119, which logically came before GF117.)

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--- Comment #13 from Johnny B. Goode <adamos at hell.factory.net.pl> ---
Now it is clean

dmesg | grep nouveau
[   14.413889] nouveau: detected PR support, will not use DSM
[   14.414961] nouveau 0000:08:00.0: enabling device (0006 -> 0007)
[   14.416192] nouveau 0000:08:00.0: NVIDIA GF117 (0d7000a2)
[   14.438204] nouveau 0000:08:00.0: bios: version 75.17.86.00.04
[   14.522882] nouveau 0000:08:00.0: fb: 2048 MiB DDR3
[   15.185221] nouveau 0000:08:00.0: DRM: VRAM: 2048 MiB
[   15.186151] nouveau 0000:08:00.0: DRM: GART: 1048576 MiB
[   15.187077] nouveau 0000:08:00.0: DRM: Pointer to TMDS table invalid
[   15.188001] nouveau 0000:08:00.0: DRM: DCB version 4.0
[   15.190738] nouveau 0000:08:00.0: DRM: MM: using COPY0 for buffer copies
[   15.191642] [drm] Initialized nouveau 1.3.1 20120801 for 0000:08:00.0 on
minor 0

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--- Comment #14 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Woohoo! I'll submit my 2 patches upstream, but we'll have to think what
to do
about the lockvga situation ... we do it REALLY early right now.

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--- Comment #15 from Johnny B. Goode <adamos at hell.factory.net.pl> ---
Super. Thank you :)

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--- Comment #16 from Johnny B. Goode <adamos at hell.factory.net.pl> ---
Kernel 5 generates more faults then earlier version.

# uname -a
Linux 5.0.9-gentoo #1 SMP Sun Apr 21 04:31:13 CEST 2019 x86_64 Intel(R)
Core(TM) i3-4030U CPU @ 1.90GHz GenuineIntel GNU/Linux

# journalctl -b -1 --no-hostname -o short-monotonic | grep nouveau
[    5.629856] kernel: nouveau: detected PR support, will not use DSM
[    5.629893] kernel: nouveau 0000:08:00.0: enabling device (0006 -> 0007)
[    5.630103] kernel: nouveau 0000:08:00.0: NVIDIA GF117 (0d7000a2)
[    5.785996] kernel: nouveau 0000:08:00.0: bios: version 75.17.86.00.04
[    5.870928] kernel: nouveau 0000:08:00.0: fb: 2048 MiB DDR3
[    6.527871] kernel: nouveau 0000:08:00.0: DRM: VRAM: 2048 MiB
[    6.527873] kernel: nouveau 0000:08:00.0: DRM: GART: 1048576 MiB
[    6.527876] kernel: nouveau 0000:08:00.0: DRM: Pointer to TMDS table invalid
[    6.527878] kernel: nouveau 0000:08:00.0: DRM: DCB version 4.0
[    6.529675] kernel: nouveau 0000:08:00.0: DRM: MM: using COPY0 for buffer
copies
[    6.529850] kernel: [drm] Initialized nouveau 1.3.1 20120801 for
0000:08:00.0 on minor 1
[    7.681975] kernel: nouveau 0000:08:00.0: bus: MMIO write of 0000001f FAULT
at 6013d4 [ IBUS ]
[    7.682002] kernel: nouveau 0000:08:00.0: bus: MMIO write of badf1001 FAULT
at 50405c [ IBUS ]
[   36.995439] kernel: nouveau 0000:08:00.0: bus: MMIO write of 04048d1f FAULT
at 6013d4 [ IBUS ]
[   47.395823] kernel: nouveau 0000:08:00.0: bus: MMIO write of 04048d1f FAULT
at 6013d4 [ IBUS ]
[  186.745334] kernel: nouveau 0000:08:00.0: bus: MMIO write of 04048d1f FAULT
at 6013d4 [ IBUS ]
[  186.745358] kernel: nouveau 0000:08:00.0: bus: MMIO write of badf1001 FAULT
at 50405c [ IBUS ]
[  308.263103] kernel: nouveau 0000:08:00.0: bus: MMIO write of 04048d1f FAULT
at 6013d4 [ IBUS ]
[  325.400452] kernel: nouveau 0000:08:00.0: bus: MMIO write of 04048d1f FAULT
at 6013d4 [ IBUS ]
[  345.742702] kernel: nouveau 0000:08:00.0: bus: MMIO write of 04048d1f FAULT
at 6013d4 [ IBUS ]
[  360.574654] kernel: nouveau 0000:08:00.0: bus: MMIO write of 04048d1f FAULT
at 6013d4 [ IBUS ]
[  374.383876] kernel: nouveau 0000:08:00.0: bus: MMIO write of 04048d1f FAULT
at 6013d4 [ IBUS ]
[  523.869265] kernel: nouveau 0000:08:00.0: bus: MMIO write of 04048d1f FAULT
at 6013d4 [ IBUS ]
[  554.220856] kernel: nouveau 0000:08:00.0: bus: MMIO write of 04048d1f FAULT
at 6013d4 [ IBUS ]
[  655.092116] kernel: nouveau 0000:08:00.0: bus: MMIO write of 0000001f FAULT
at 6013d4 [ IBUS ]

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

--- Comment #17 from Katie Webber <brayden08sheean at gmail.com> ---
That would be a great extra menu. This software can really be used for
educational purposes. This menu will greatly simplify the task. I would also
add a feature to buy coursework through some kind of educational website. I
recommend using the service https://papersowl.com/buy-term-paper I have been
using this for many years and have always been pleased. This can be a great
addition to all the software.

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

Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #18 from Martin Peres <martin.peres at free.fr> ---
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