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<body><span class="vcard"><a class="email" href="mailto:huax.lu@intel.com" title="lu hua <huax.lu@intel.com>"> <span class="fn">lu hua</span></a>
</span> changed
<a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [IVB Bisected]igt/gem_storedw_batches_loop/normal causes [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... blitter ring idle"
href="https://bugs.freedesktop.org/show_bug.cgi?id=71564">bug 71564</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEEDINFO
</td>
<td>REOPENED
</td>
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<td style="text-align:right;">Assignee</td>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<td style="text-align:right;">Summary</td>
<td>[IVB Regression]igt/gem_storedw_batches_loop/normal causes [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... blitter ring idle
</td>
<td>[IVB Bisected]igt/gem_storedw_batches_loop/normal causes [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... blitter ring idle
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [IVB Bisected]igt/gem_storedw_batches_loop/normal causes [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... blitter ring idle"
href="https://bugs.freedesktop.org/show_bug.cgi?id=71564#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [IVB Bisected]igt/gem_storedw_batches_loop/normal causes [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... blitter ring idle"
href="https://bugs.freedesktop.org/show_bug.cgi?id=71564">bug 71564</a>
from <span class="vcard"><a class="email" href="mailto:huax.lu@intel.com" title="lu hua <huax.lu@intel.com>"> <span class="fn">lu hua</span></a>
</span></b>
<pre>Bisect shows:094f9a54e35500739da185cdb78f2e92fc379458 is the first bad commit.
commit 094f9a54e35500739da185cdb78f2e92fc379458
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
AuthorDate: Wed Sep 25 17:34:55 2013 +0100
Commit: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
CommitDate: Thu Oct 3 20:01:30 2013 +0200
drm/i915: Fix __wait_seqno to use true infinite timeouts
When we switched to always using a timeout in conjunction with
wait_seqno, we lost the ability to detect missed interrupts. Since, we
have had issues with interrupts on a number of generations, and they are
required to be delivered in a timely fashion for a smooth UX, it is
important that we do log errors found in the wild and prevent the
display stalling for upwards of 1s every time the seqno interrupt is
missed.
Rather than continue to fix up the timeouts to work around the interface
impedence in wait_event_*(), open code the combination of
wait_event[_interruptible][_timeout], and use the exposed timer to
poll for seqno should we detect a lost interrupt.
v2: In order to satisfy the debug requirement of logging missed
interrupts with the real world requirments of making machines work even
if interrupts are hosed, we revert to polling after detecting a missed
interrupt.
v3: Throw in a debugfs interface to simulate broken hw not reporting
interrupts.</pre>
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