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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="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]()"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86092">86092</a>
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</tr>
<tr>
<th>Summary</th>
<td>[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]()
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>huax.lu@intel.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=109187" name="attach_109187" title="dmesg">attachment 109187</a> <a href="attachment.cgi?id=109187&action=edit" title="dmesg">[details]</a></span>
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</pre>
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