[Bug 110509] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=110509

--- Comment #6 from James.Dutton@gmail.com ---
I think I have found the problem.
[  657.526313] amdgpu 0000:43:00.0: GPU reset begin!
[  657.526318] Evicting PASID 32782 queues
[  667.756000] [drm:amdgpu_dm_atomic_check [amdgpu]] *ERROR* [CRTC:49:crtc-0]
hw_done or flip_done timed out


The intention is to do a GPU reset, but the implementation in the code is just
to try and do a suspend.
Part of the suspend does this:

Apr 29 14:29:19 thread kernel: [  363.445607] INFO: task kworker/u258:0:55
blocked for more than 120 seconds.
Apr 29 14:29:19 thread kernel: [  363.445612]       Not tainted 5.0.10-dirty
#26
Apr 29 14:29:19 thread kernel: [  363.445613] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Apr 29 14:29:19 thread kernel: [  363.445615] kworker/u258:0  D    0    55     
2 0x80000000
Apr 29 14:29:19 thread kernel: [  363.445628] Workqueue: events_unbound
commit_work [drm_kms_helper]
Apr 29 14:29:19 thread kernel: [  363.445629] Call Trace:
Apr 29 14:29:19 thread kernel: [  363.445635]  __schedule+0x2c0/0x880
Apr 29 14:29:19 thread kernel: [  363.445637]  schedule+0x2c/0x70
Apr 29 14:29:19 thread kernel: [  363.445639]  schedule_timeout+0x1db/0x360
Apr 29 14:29:19 thread kernel: [  363.445641]  ? update_load_avg+0x8b/0x590
Apr 29 14:29:19 thread kernel: [  363.445645] 
dma_fence_default_wait+0x1eb/0x270
Apr 29 14:29:19 thread kernel: [  363.445647]  ? dma_fence_release+0xa0/0xa0
Apr 29 14:29:19 thread kernel: [  363.445649] 
dma_fence_wait_timeout+0xfd/0x110
Apr 29 14:29:19 thread kernel: [  363.445651] 
reservation_object_wait_timeout_rcu+0x17d/0x370
Apr 29 14:29:19 thread kernel: [  363.445710]  amdgpu_dm_do_flip+0x14a/0x4a0
[amdgpu]
Apr 29 14:29:19 thread kernel: [  363.445767] 
amdgpu_dm_atomic_commit_tail+0x7b7/0xc10 [amdgpu]
Apr 29 14:29:19 thread kernel: [  363.445820]  ?
amdgpu_dm_atomic_commit_tail+0x7b7/0xc10 [amdgpu]
Apr 29 14:29:19 thread kernel: [  363.445828]  commit_tail+0x42/0x70
[drm_kms_helper]
Apr 29 14:29:19 thread kernel: [  363.445835]  commit_work+0x12/0x20
[drm_kms_helper]
Apr 29 14:29:19 thread kernel: [  363.445838]  process_one_work+0x1fd/0x400
Apr 29 14:29:19 thread kernel: [  363.445840]  worker_thread+0x34/0x410
Apr 29 14:29:19 thread kernel: [  363.445841]  kthread+0x121/0x140
Apr 29 14:29:19 thread kernel: [  363.445843]  ? process_one_work+0x400/0x400
Apr 29 14:29:19 thread kernel: [  363.445844]  ? kthread_park+0x90/0x90
Apr 29 14:29:19 thread kernel: [  363.445847]  ret_from_fork+0x22/0x40


So, amggpu_dm_do_flip()  is the bit that hangs.
If the GPU needs to be reset because some of it has hung, trying a "flip" is
unlikely to work.
It is failing/hanging when doing "suspend of IP block <dm>" in
amdgpu_device_ip_suspend_phase1().

I would suggest creating code that actually tries to reset the GPU, instead of
trying to suspend it while GPU is hung.

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