[Bug 78764] New: [ILK/IVB/HSW Bisected]igt/gem_reg_read fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78764

          Priority: high
            Bug ID: 78764
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [ILK/IVB/HSW Bisected]igt/gem_reg_read fails
        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 99132
  --> https://bugs.freedesktop.org/attachment.cgi?id=99132&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 
It was igt issue

Non-working platforms: ILK IVB HSW

==kernel==
--------------------------
-nightly: c74cad3c2599b47438b168ca5629fbb00ab63f95 (fails)
-queued: 229b0489aa75a8c51d2f2e124329d3ac326f326d (fails)
    Author: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Date:   Wed May 14 17:02:17 2014 +0300

    drm/i915: add null render states for gen6, gen7 and gen8

    These are generated with intel-gpu-tools/tools/null_state_gen

    v2: Don't use header file for states (Daniel Vetter)

    v3: Proper URB state size for gen8/GT3 (Damien Lespiau)

    Tested-by: Kristen Carlson Accardi <kristen at linux.intel.com> (v1)
    Tested-by: Oscar Mateo <oscar.mateo at intel.com> (v2)
    Acked-by: Damien Lespiau <damien.lespiau at intel.com>
    Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>


-fixes: 05adaf1f101f25f40f12c29403e6488f0e45f6b6 (fails)
    Author: Jani Nikula <jani.nikula at intel.com>
    Date:   Fri May 9 14:52:34 2014 +0300

    drm/i915/vlv: reset VLV media force wake request register

    Media force wake get hangs the machine when the system is booted without
    displays attached. The assumption is that (at least some versions of)
    the firmware has skipped some initialization in that case.

    Empirical evidence suggests we need to reset the media force wake
    request register in addition to the render one to avoid hangs.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75895
    Reported-by: Imre Deak <imre.deak at intel.com>
    Reported-by: Darren Hart <dvhart at linux.intel.com>
    Tested-by: Darren Hart <dvhart at linux.intel.com>
    Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>
    Cc: stable at vger.kernel.org
    Signed-off-by: Jani Nikula <jani.nikula at intel.com>

==Bug detailed description==
-----------------------------
igt(5e83f0444d0fcef2d5996ef12f9cf1593ccd8f78)

igt/gem_reg_read fails

Output:
./gem_reg_read
IGT-Version: 1.6-g62cd793 (x86_64) (Linux:
3.15.0-rc3_drm-intel-nightly_c74cad_20140515+ x86_64)
Test assertion failure function __real_main55, file gem_reg_read.c:76:
Last errno: 22, Invalid argument
Failed assertion: ret != 0 && errno == ENOENT

==Reproduce steps==
---------------------------- 
1. ./gem_reg_read


==Bisect results==
----------------------------
Bisect shows: 0b7ce4ac2929ea56dfde508d551163a5304c66d8 is the first bad commit

commit 0b7ce4ac2929ea56dfde508d551163a5304c66d8
Author:     Daniel Vetter <daniel.vetter at ffwll.ch>
AuthorDate: Wed May 14 09:56:53 2014 +0200
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Wed May 14 09:56:53 2014 +0200

    tests: Use igt macros more

    Often just folding together of the common if (cond) printf;
    abort|igt_skip|igt_fail; pattern. But in a few cases I've ripped out
    more since the igt macros will already print the condition and errno.

    A few tests where more work (like ripping out return codes en masse)
    is needed left as-is.

    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

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