(REGRESSION bisected) Re: amdgpu errors (VM fault / GPU fault detected) with 5.19 merge window snapshots

[Michal Kubecek]

On Fri, May 27, 2022 at 11:00:39AM +0200, Michal Kubecek wrote:
> Hello,
> 
> while testing 5.19 merge window snapshots (commits babf0bb978e3 and
> 7e284070abe5), I keep getting errors like below. I have not seen them
> with 5.18 final or older.
> 
> ------------------------------------------------------------------------
> [  247.150333] gmc_v8_0_process_interrupt: 46 callbacks suppressed
> [  247.150336] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x00020802 for process firefox pid 6101 thread firefox:cs0 pid 6116
> [  247.150339] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00107800
> [  247.150340] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0D008002
> [  247.150341] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 6, pasid 32780) at page 1079296, write from 'TC2' (0x54433200) (8)
[...]
> [  249.925909] amdgpu 0000:0c:00.0: amdgpu: IH ring buffer overflow (0x000844C0, 0x00004A00, 0x000044D0)
> [  250.434986] [drm] Fence fallback timer expired on ring sdma0
> [  466.621568] gmc_v8_0_process_interrupt: 122 callbacks suppressed
[...]
> ------------------------------------------------------------------------
> 
> There does not seem to be any apparent immediate problem with graphics
> but when running commit babf0bb978e3, there seemed to be a noticeable
> lag in some operations, e.g. when moving a window or repainting large
> part of the terminal window in konsole (no idea if it's related).
> 
> My GPU is Radeon Pro WX 2100 (1002:6995). What other information should
> I collect to help debugging the issue?

Bisected to commit 5255e146c99a ("drm/amdgpu: rework TLB flushing").
There seem to be later commits depending on it so I did not test
a revert on top of current mainline.

I should also mention that most commits tested as "bad" during the
bisect did behave much worse than current mainline (errors starting as
early as with sddm, visibly damaged screen content, sometimes even
crashes). But all of them issued messages similar to those above into
kernel log.

Michal Kubecek
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