[Bug 90369] New: [IVB bisected]igt/pm_rc6_residency subcase rc6-accuracy fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90369

            Bug ID: 90369
           Summary: [IVB bisected]igt/pm_rc6_residency subcase
                    rc6-accuracy fail
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: yex.tian at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 115630
  --> https://bugs.freedesktop.org/attachment.cgi?id=115630&action=edit
dmesg info

==System Environment==       
-----------------------------------------------------
Regression: Yes
Non-working platforms: IVB

==Kernel==
--------------------------------------------------
commit 20e7fca46c6d1598a9720f3b0b06acb982919cf8
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Thu May 7 18:16:42 2015 +0200

    drm-intel-nightly: 2015y-05m-07d-16h-16m-10s UTC integration manifest

==Bug detailed description==
--------------------------------------------------
igt/pm_rc6_residency subcase rc6-accuracy fail on IVB.
It’s kernel regression, By bisected, show the first bad commit is 71b7e54
commit 71b7e54f71b899db9f8def67a0e976969384e699
Author:     Daniel Vetter <daniel.vetter at ffwll.ch>
AuthorDate: Tue Apr 14 17:35:18 2015 +0200
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Thu Apr 23 21:06:02 2015 +0200

    drm/i915: Don't look at pg_dirty_rings for aliasing ppgtt

    We load the ppgtt ptes once per gpu reset/driver load/resume and
    that's all that's needed. Note that this only blows up when we're
    using the allocate_va_range funcs and not the special-purpose ones
    used. With this change we can get rid of that duplication.

    Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>

==output==

[root at x-ivb6 tests]# ./pm_rc6_residency --run-subtest rc6-accuracy
IGT-Version: 1.10-g159562c (x86_64) (Linux:
4.1.0-rc2_drm-intel-nightly_20e7fc_20150508+ x86_64)
Test assertion failure function residency_accuracy, file
pm_rc6_residency.c:104:
Failed assertion: diff >= (SLEEP_DURATION - RC6_FUDGE)
GPU was not in RC6 long enough. Check that the GPU is as idle as possible(ie.
no X, running and running no other tests)
Stack trace:
  #0 [__igt_fail_assert+0xf1]
  #1 [residency_accuracy+0x171]
  #2 [__real_main134+0xdd]
  #3 [main+0x21]
  #4 [__libc_start_main+0xf5]
  #5 [_start+0x29]
  #6 [<unknown>+0x29]
Subtest rc6-accuracy failed.
**** DEBUG ****
Test assertion failure function residency_accuracy, file
pm_rc6_residency.c:104:
Failed assertion: diff >= (SLEEP_DURATION - RC6_FUDGE)
GPU was not in RC6 long enough. Check that the GPU is as idle as possible(ie.
no X, running and running no other tests)
****  END  ****
Subtest rc6-accuracy: FAIL (0.003s)

==Reproduce steps==
----------------------------
1, ./pm_rc6_residency --run-subtest rc6-accuracy

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