[Bug 88301] Dota causes GPU fault and kernel hang

[Bug 88301] Dota causes GPU fault and kernel hang

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=88301

            Bug ID: 88301
           Summary: Dota causes GPU fault and kernel hang
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: tilman@code-monkey.de

I've got an apitrace of Dota that reliably causes GPU faults on radeonsi on my
Bonaire XTX.

The trace: http://files.code-monkey.de/dota.trace (468797931 bytes).

I'm running Mesa from master (8d2542fc9d5af4db355b67cc2a1ff2f413685a27) and can
reproduce the problem with kernel 3.18.2 and 3.19.0-rc2 (built from airlied's
drm-fixes tree; 79305ec6e60d320832505e95c1a028d309fcd2b6).
agd5f's "fix VM flush" patches from 2015-01-06 don't help either.

Example kernel log excerpt:
radeon 0000:01:00.0: GPU fault detected: 147 0x000c4801
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x01000000
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0C048001
VM fault (0x01, vmid 6) at page 16777216, read from 'TC2' (0x54433200) (72)
radeon 0000:01:00.0: GPU fault detected: 146 0x000c080c
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00000000
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0C00800C
VM fault (0x0c, vmid 6) at page 0, read from 'TC0' (0x54433000) (8)

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[Bug 88301] Dota causes GPU fault and kernel hang

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https://bugs.freedesktop.org/show_bug.cgi?id=88301

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Replaying this trace on my Kaveri, I get similar GPUVM faults, but no hangs.

What are the symptoms of the hangs?

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[Bug 88301] Dota causes GPU fault and kernel hang

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https://bugs.freedesktop.org/show_bug.cgi?id=88301

--- Comment #2 from Tilman Sauerbeck <tilman@code-monkey.de> ---
Sorry about that misinformation.
It's not a hang at all since I'm still able to use sysrq to reboot.

What's happening after the GPU faults is that apparently the driver attempts to
get the card back into working shape, but fails to do so. X doesn't become
usable again after the GPU faults anyway.

Here's the kernel log following the GPU faults:

radeon 0000:01:00.0: ring 0 stalled for more than 10428msec
radeon 0000:01:00.0: GPU lockup (current fence id 0x0000000000107f5c last fence
id 0x00000000001080f7 on ring 0)
radeon 0000:01:00.0: failed to get a new IB (-35)
[drm:radeon_cs_ib_fill] *ERROR* Failed to get ib !
radeon 0000:01:00.0: Saved 7977 dwords of commands on ring 0.
radeon 0000:01:00.0: GPU softreset: 0x00000009
[snipped list of registers that were reset (I think)]

[drm] probing gen 2 caps for device 1002:5a16 = 31cd02/0
[drm] PCIE gen 2 link speeds already enabled
[drm] PCIE GART of 1024M enabled (table at 0x000000000078C000).
radeon 0000:01:00.0: WB enabled
radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000080000c00 and
cpu addr 0xffff8800bac4cc00
radeon 0000:01:00.0: fence driver on ring 1 use gpu addr 0x0000000080000c04 and
cpu addr 0xffff8800bac4cc04
radeon 0000:01:00.0: fence driver on ring 2 use gpu addr 0x0000000080000c08 and
cpu addr 0xffff8800bac4cc08
radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000080000c0c and
cpu addr 0xffff8800bac4cc0c
radeon 0000:01:00.0: fence driver on ring 4 use gpu addr 0x0000000080000c10 and
cpu addr 0xffff8800bac4cc10
radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000076c98 and
cpu addr 0xffffc90010c36c98
radeon 0000:01:00.0: fence driver on ring 6 use gpu addr 0x0000000080000c18 and
cpu addr 0xffff8800bac4cc18
radeon 0000:01:00.0: fence driver on ring 7 use gpu addr 0x0000000080000c1c and
cpu addr 0xffff8800bac4cc1c
[drm] ring test on 0 succeeded in 3 usecs
[drm:cik_ring_test] *ERROR* radeon: ring 1 test failed
(scratch(0x3010C)=0xCAFEDEAD)
[drm:cik_ring_test] *ERROR* radeon: ring 2 test failed
(scratch(0x3010C)=0xCAFEDEAD)
[drm:cik_sdma_ring_test] *ERROR* radeon: ring 3 test failed (0xCAFEDEAD)
[drm:cik_resume] *ERROR* cik startup failed on resume
[drm:radeon_pm_resume_dpm] *ERROR* radeon: dpm resume failed

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[Bug 88301] Dota causes GPU fault and kernel hang

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https://bugs.freedesktop.org/show_bug.cgi?id=88301

--- Comment #3 from smoki <smoki00790@gmail.com> ---

 I can reproduce this on Kabini with current proper mesa and llvm, but not with
Tom's perf-Jan-08-2015 llvm + vgpr-spilling-Jan07-2014 mesa branches it works
fine there.

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[Bug 88301] Dota causes GPU fault and kernel hang

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https://bugs.freedesktop.org/show_bug.cgi?id=88301

--- Comment #4 from Tilman Sauerbeck <tilman@code-monkey.de> ---
(In reply to smoki from comment #3)
>  I can reproduce this on Kabini with current proper mesa and llvm, but not
> with Tom's perf-Jan-08-2015 llvm + vgpr-spilling-Jan07-2014 mesa branches it
> works fine there.

Indeed, switching llvm to perf-Jan-08-2015 fixes the GPU faults.

For the record, with my Mesa installation from git master I do get
> Warning: Compiler emitted unknown config register: 0x286e8
in glretrace, but that doesn't seem to cause any visible breakage.

Should I leave the bug open until the fix hits LLVM trunk?

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[Bug 88301] Dota causes GPU fault and kernel hang

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https://bugs.freedesktop.org/show_bug.cgi?id=88301

--- Comment #5 from smoki <smoki00790@gmail.com> ---

 This is fixed now with current mesa and llvm.

 Tilman, you may want to confirm and eventually to close this bug.

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[Bug 88301] Dota causes GPU fault and kernel hang

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https://bugs.freedesktop.org/show_bug.cgi?id=88301

Tilman Sauerbeck <tilman@code-monkey.de> changed:

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

--- Comment #6 from Tilman Sauerbeck <tilman@code-monkey.de> ---
(In reply to smoki from comment #5)
>  This is fixed now with current mesa and llvm.
> 
>  Tilman, you may want to confirm and eventually to close this bug.

Confirmed. Thanks for the heads-up.

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