[Bug 110982] [SKL]GPU HANG: ecode 9:0:0x00000000, hang on rcs0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110982

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
rcs:
  START: 0x0000d000
  HEAD:  0x00e01470 [0x00000000]
    head = 0x00001470, wraps = 7
  TAIL:  0x00001470 [0x00000000, 0x00000000]
  CTL:   0x00003001
    len=16384, enabled
  MODE:  0x00000000
  HWS:   0xffffe000
  ACTHD: 0x00000000 00e01470
    at ring: 0x00000000
  IPEIR: 0x00000000
  IPEHR: 0x02800000

  ELSP[0]:  pid 688, ban score 0, seqno        3:0002b24b!, prio 2, emitted
-1119ms, start 0000d000, head 000013d0, tail 00001470
  ELSP[1]:  pid 611, ban score 0, seqno        2:0002b24c, prio 0, emitted
-1114ms, start 00009000, head 00003b60, tail 00003bf8

The CS reached the end of the ring, but the GPU failed to switch contexts.

Then the GPU failed to respond to reset requests, further indicating it had
suffered a terminal shock. Immediate suspicion would be on powergating, for the
similarity with say bug 110450.

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