[drm] IP block:gfx_v8_0 is hung!

[Sunnanyong (Nanyong Sun, Intelligent Computing Solution Development Dep)]

Hi All,
    When use amd radeon pro wx5100 with opensource driver(mesa17.2.8 , llvm5.0, kernel v4.17, Ubuntu17.10), GPU hung happened accidentally:
     [260362.362835] amdgpu 0005:01:00.0: GPU fault detected: 146 0x02c0082c
[260362.369366] amdgpu 0005:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00100058
[260362.377099] amdgpu 0005:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0400802C
[260362.384781] amdgpu 0005:01:00.0: VM fault (0x2c, vmid 2, pasid 32792) at page 1048664, read from 'TC0' (0x54433000) (8)
[260372.423402] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, last signaled seq=132702874, last emitted seq=132702877
[260372.435267] [drm] IP block:gfx_v8_0 is hung!
[260372.435276] [drm] GPU recovery disabled.

I have seen the similar problem in :
https://bugs.freedesktop.org/show_bug.cgi?id=102322

and I have used umr to dump the gfx info and attached:
umr -lb
umr -R gfx[.]
umr -R sdma0[.]
umr -R sdma1[.]


Please have a look and help this, Thanks : )
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