[Bug 110285] Stability issue in i915 during continuous 15h transcode workload with MFE

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110285

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
Of particular note,

  batch: [0x00000000_05489000, 0x00000000_05491000]
  BBADDR: 0x00000000_029b5269

(GPU is reading far out of bounds)

And
  HEAD:  0x040019e8 [0x00000ac8]
    head = 0x000019e8, wraps = 32
  TAIL:  0x000014b8 [0x00000b28, 0x00000b48]

  ELSP[0]:  pid 3041, ban score 0, seqno       26:0c994e24, prio 2, emitted
-184
ms, start ffd4b000, head 00001430, tail 000014b8
  ELSP[1]:  pid 3041, ban score 0, seqno       2e:0c994e25, prio 2, emitted
-160
ms, start ffc3b000, head 00001158, tail 000011d8 

 START: 0xffd4b000

says the CS overran the RING_TAIL.

But that doesn't explain

  seqno: 0x0c994354
  last_seqno: 0x0c994e25

as the older seqno is not in the ELSP0 ring (so would not have been rewritten
by the overrun). I suspect the pipecontrol writes stopped first.

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