[Bug 84446] New: [IVB Regression]igt/gem_reset_stats/ban-blt costs long time to execute

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84446

          Priority: high
            Bug ID: 84446
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB Regression]igt/gem_reset_stats/ban-blt costs long
                    time to execute
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 107037
  --> https://bugs.freedesktop.org/attachment.cgi?id=107037&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes.
Good commit on -next-queued:
9c787942907face82da505c2c5493998b56cfc5a(2014_09_08)

Non-working platforms: IVB

==kernel==
--------------------------
origin/drm-intel-nightly:7101d84020f63f1da7e0c5d021cdd6be4d515de5(fails)
    drm-intel-nightly: 2014y-09m-25d-15h-14m-02s UTC integration manifest
origin/drm-intel-next-queued:7ca5a41f4da201371e131fc0641033652f76bf30(fails)
    drm/i915: Avoid re-configure panel on every PSR re-enable.
origin/drm-intel-fixes: c84db77010877da6c5da119868ed54c43d59e726(works)
    drm/i915/hdmi: fix hdmi audio state readout


==Bug detailed description==
-----------------------------
igt/gem_reset_stats/ban-blt costs long time to execute

Output:
[root at x-ivb9 tests]# time ./gem_reset_stats --run-subtest ban-blt
IGT-Version: 1.8-g32a0308 (x86_64) (Linux:
3.17.0-rc6_drm-intel-nightly_7101d8_20140928_debug+ x86_64)
retrying for ban (9)
retrying for ban (8)
retrying for ban (7)
retrying for ban (6)
retrying for ban (5)
retrying for ban (4)
retrying for ban (3)
retrying for ban (2)
retrying for ban (1)
retrying for ban (0)
Test assertion failure function test_ban, file gem_reset_stats.c:572:
Failed assertion: h4 == -EIO
Subtest ban-blt: FAIL (1414.204s)
Test requirement not met in function gem_require_ring, file
ioctl_wrappers.c:880:
Test requirement: gem_has_vebox(fd)

real    24m48.268s
user    0m0.002s
sys     0m0.027s

==Reproduce steps==
---------------------------- 
1. ./gem_reset_stats --run-subtest ban-blt

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