[Bug 81701] New: [BDW Regression]igt/gem_reset_stats some subcases cause "[drm:hsw_unclaimed_reg_detect] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem."

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81701

          Priority: high
            Bug ID: 81701
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW Regression]igt/gem_reset_stats some subcases
                    cause "[drm:hsw_unclaimed_reg_detect] *ERROR*
                    Unclaimed register detected. Please use the
                    i915.mmio_debug=1 to debug this problem."
        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 103380
  --> https://bugs.freedesktop.org/attachment.cgi?id=103380&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes

Good commit on -next-queued: 91565c85b66db820f01894a971d39aaef60c4325

Non-working platforms: BDW

==kernel==
--------------------------
origin/drm-intel-nightly: af1aaba219fdd90ca1b30f9b8d8d19352224f170(fails)
    drm-intel-nightly: 2014y-07m-23d-20h-15m-10s integration manifest
origin/drm-intel-next-queued: 2b8ee5710915a244b807fbe3427299d007d19e89(fails)
    drm/i915: Allow overlapping userptr objects  
origin/drm-intel-fixes: eedd10f45bdcb2a5b2afa35f845e080c3bc984f2(works)
    drm/i915: Simplify i915_gem_release_all_mmaps()

==Bug detailed description==
-----------------------------
igt/gem_reset_stats some subcases cause "[drm:hsw_unclaimed_reg_detect] *ERROR*
Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this
problem."

Output:
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./gem_reset_stats
--run-subtest reset-stats-ctx-render
IGT-Version: 1.7-g70e6ed9 (x86_64) (Linux:
3.16.0-rc4_drm-intel-next-queued_2b8ee5_20140724_debug+ x86_64)
Subtest reset-stats-ctx-render: SUCCESS
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r|egrep
"<[1-4]>"|grep drm
<3>[  169.278194] [drm:hsw_unclaimed_reg_detect] *ERROR* Unclaimed register
detected. Please use the i915.mmio_debug=1 to debug this problem.
<3>[  175.277357] [drm:hsw_unclaimed_reg_detect] *ERROR* Unclaimed register
detected. Please use the i915.mmio_debug=1 to debug this problem.
<3>[  175.278108] [drm:i915_context_is_banned] *ERROR* gpu hanging too fast,
banning!
<3>[  181.280352] [drm:hsw_unclaimed_reg_detect] *ERROR* Unclaimed register
detected. Please use the i915.mmio_debug=1 to debug this problem.
<3>[  181.280605] [drm:i915_context_is_banned] *ERROR* gpu hanging too fast,
banning!


Reproduce steps:
-------------------------
1. ./gem_reset_stats --run-subtest reset-stats-ctx-render

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