[Bug 86092] New: [HSW/BDW]igt/kms_plane sporadically causes WARNING: at drivers/gpu/drm/i915/intel_uncore.c:705 hsw_unclaimed_reg_debug.isra.11+0x62/0x72 [i915]()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86092

            Bug ID: 86092
           Summary: [HSW/BDW]igt/kms_plane sporadically causes WARNING: at
                    drivers/gpu/drm/i915/intel_uncore.c:705
                    hsw_unclaimed_reg_debug.isra.11+0x62/0x72 [i915]()
           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: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 109187
  --> https://bugs.freedesktop.org/attachment.cgi?id=109187&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure 
Non-working platforms: BDW

==kernel==
--------------------------
drm-intel-nightly/b921a5e434f541c6d96378838df47b4259cc3489

==Bug detailed description==
Test on BDW with -nightly kernel, it sporadically causes WARNING: at
drivers/gpu/drm/i915/intel_uncore.c:705
hsw_unclaimed_reg_debug.isra.11+0x62/0x72 [i915](), fail rate: 2/5. 
Run 5 cycles on -queued kernel and -fixes kernel, it works well. 
On automation testing, HSW with -fixes kernel also has this issue.

dmesg:
<3>[  103.610991] [drm:hsw_unclaimed_reg_detect.isra.7 [i915]] *ERROR*
Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this
problem.
<3>[  103.611003] [drm:hsw_unclaimed_reg_detect.isra.7 [i915]] *ERROR*
Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this
problem.<7>[  103.611005] [drm:pipe_crc_set_source] stopping CRCs for pipe B
<3>[  103.613052] [drm:hsw_unclaimed_reg_detect.isra.7 [i915]] *ERROR*
Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this
problem.

dmesg with i915.mmio_debug=1:
[  116.773446] WARNING: CPU: 0 PID: 4676 at
drivers/gpu/drm/i915/intel_uncore.c:705
hsw_unclaimed_reg_debug.isra.11+0x62/0x72 [i915]()
[  116.773452] Unclaimed register detected after writing to register 0x61050
[  116.773453] Modules linked in: battery parport_pc parport dm_mod ac
acpi_cpufreq i915 button video drm_kms_helper drm cfbfillrect cfbimgblt
cfbcopyarea
[  116.773464] CPU: 0 PID: 4676 Comm: kms_plane Not tainted
3.18.0-rc3_drm-intel-nightly_b921a5_20141110+ #1378
[  116.773469]  0000000000000000 0000000000000009 ffffffff81789002
ffff8800a758fdb8
[  116.773471]  ffffffff810368cc ffff8800a7cdf000 ffffffffa00bd47f
0000000000000001
[  116.773473]  ffff880002e80060 0000000000061050 ffffc90010a61050
00000000c0000000
[  116.773478] Call Trace:
[  116.773484]  [<ffffffff81789002>] ? dump_stack+0x41/0x51
[  116.773492]  [<ffffffff810368cc>] ? warn_slowpath_common+0x78/0x90
[  116.773505]  [<ffffffffa00bd47f>] ?
hsw_unclaimed_reg_debug.isra.11+0x62/0x72 [i915]
[  116.773511]  [<ffffffff8103697c>] ? warn_slowpath_fmt+0x45/0x4a
[  116.773524]  [<ffffffffa00bd47f>] ?
hsw_unclaimed_reg_debug.isra.11+0x62/0x72 [i915]
[  116.773540]  [<ffffffffa00bda98>] ? gen8_write32+0xea/0x11a [i915]
[  116.773549]  [<ffffffffa00950c4>] ? display_crc_ctl_write+0x5ad/0x8b5 [i915]
[  116.773553]  [<ffffffff8110c627>] ? vfs_write+0xb0/0x183
[  116.773555]  [<ffffffff8110c8fe>] ? SyS_write+0x41/0x84
[  116.773559]  [<ffffffff8178e692>] ? system_call_fastpath+0x12/0x17
[  116.773561] ---[ end trace a96c0bc697cb22eb ]---


output:
IGT-Version: 1.8-gc049c39 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_b921a5_20141110+ x86_64)
Testing connector eDP-1 using pipe B plane 1
Subtest plane-panning-bottom-right-pipe-B-plane-1: SUCCESS (3.348s)

==Reproduce steps==
---------------------------- 
1. ./kms_plane --run-subtest plane-panning-bottom-right-pipe-B-plane-1

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