[Bug 87184] [BYT/BSW]igt/gem_concurrent_blit and gem_reset_stats sporadically causes *ERROR* Timed out: waiting for Render to ack

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87184

--- Comment #2 from lu hua <huax.lu at intel.com> ---
Created attachment 111355
  --> https://bugs.freedesktop.org/attachment.cgi?id=111355&action=edit
dmesg(kms_flip)

Many kms_flip subcases also have this issue.
Run ./kms_flip --run-subtest flip-vs-panning-vs-hang, it fails 1 in 2 runs.
root at x-bsw01:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./kms_flip
--run-subtest flip-vs-panning-vs-hang
IGT-Version: 1.9-geb799b2 (x86_64) (Linux:
3.18.0-rc7_drm-intel-next-queued_140fd3_20141226+ x86_64)
Using monotonic timestamps
Beginning flip-vs-panning-vs-hang on crtc 8, connector 29
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
....
flip-vs-panning-vs-hang on crtc 8, connector 29: PASSED

Beginning flip-vs-panning-vs-hang on crtc 13, connector 29
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
....
flip-vs-panning-vs-hang on crtc 13, connector 29: PASSED

Subtest flip-vs-panning-vs-hang: SUCCESS (49.886s)
root at x-bsw01:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r | egrep
"<[1-4]>" |grep drm
<3>[  250.789840] [drm:__vlv_force_wake_get [i915]] *ERROR* Timed out: waiting
for Render to ack.
<3>[  268.790830] [drm:__vlv_force_wake_get [i915]] *ERROR* Timed out: waiting
for Render to ack.

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