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<body><span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [BAT] [SKL GUC only] igt@* - dmesg-warn: [drm:guc_read_update_log_buffer] *ERROR* no sub-buffer to capture logs | [drm:guc_check_log_buf_overflow] *ERROR* GuC log buffer overflow"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104694">bug 104694</a>
<br>
<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>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [BAT] [SKL GUC only] igt@* - dmesg-warn: [drm:guc_read_update_log_buffer] *ERROR* no sub-buffer to capture logs | [drm:guc_check_log_buf_overflow] *ERROR* GuC log buffer overflow"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104694#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [BAT] [SKL GUC only] igt@* - dmesg-warn: [drm:guc_read_update_log_buffer] *ERROR* no sub-buffer to capture logs | [drm:guc_check_log_buf_overflow] *ERROR* GuC log buffer overflow"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104694">bug 104694</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>commit bd724318b682587ad2f989ab8e0f7b3d4486ced5
Author: Michal Wajdeczko <<a href="mailto:michal.wajdeczko@intel.com">michal.wajdeczko@intel.com</a>>
Date: Fri Jan 19 12:49:26 2018 +0000
drm/i915/guc: Keep GuC log disabled by default
It looks that GuC log functionality is not fully functional yet and
causes issues when enabled by auto(-1) modparam on debug builds.
For example, but not limited to:
[ 30.062893] ======================================================
[ 30.062894] WARNING: possible circular locking dependency detected
[ 30.062895] 4.15.0-rc8-CI-CI_DRM_3648+ #1 Tainted: G U
[ 30.062896] ------------------------------------------------------
[ 30.062897] debugfs_test/1268 is trying to acquire lock:
[ 30.062898] (&dev->struct_mutex){+.+.}, at: [<00000000e4213449>]
i915_mutex_lock_interruptible+0x47/0x130 [i915]
[ 30.062921]
but task is already holding lock:
[ 30.062921] (&mm->mmap_sem){++++}, at: [<00000000dd7adc93>]
__do_page_fault+0x106/0x560
[ 30.062924]
which lock already depends on the new lock.
References: 0ed87953532652 ("drm/i915/guc: Redefine guc_log_level modparam
values")
Bugzilla: <a class="bz_bug_link
bz_status_NEW "
title="NEW - [BAT][SKL GUC only] igt@debugfs_test@read_all_entries - dmesg-warn - WARNING: possible circular locking dependency detected"
href="show_bug.cgi?id=104693">https://bugs.freedesktop.org/show_bug.cgi?id=104693</a>
Bugzilla: <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [BAT] [SKL GUC only] igt@* - dmesg-warn: [drm:guc_read_update_log_buffer] *ERROR* no sub-buffer to capture logs | [drm:guc_check_log_buf_overflow] *ERROR* GuC log buffer overflow"
href="show_bug.cgi?id=104694">https://bugs.freedesktop.org/show_bug.cgi?id=104694</a>
Bugzilla: <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [BAT] [SKL GUC only] igt@pm_rpm@basic-[pci-d3-state | rte] -dmesg-warn - WARN_ON(!intel_irqs_enabled(dev_priv))"
href="show_bug.cgi?id=104695">https://bugs.freedesktop.org/show_bug.cgi?id=104695</a>
Signed-off-by: Michal Wajdeczko <<a href="mailto:michal.wajdeczko@intel.com">michal.wajdeczko@intel.com</a>>
Cc: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Cc: Jani Saarinen <<a href="mailto:jani.saarinen@intel.com">jani.saarinen@intel.com</a>>
Cc: Tomi Sarvela <<a href="mailto:tomi.p.sarvela@intel.com">tomi.p.sarvela@intel.com</a>>
Cc: Marta Lofstedt <<a href="mailto:marta.lofstedt@intel.com">marta.lofstedt@intel.com</a>>
Cc: Michal Winiarski <<a href="mailto:michal.winiarski@intel.com">michal.winiarski@intel.com</a>>
Link:
<a href="https://patchwork.freedesktop.org/patch/msgid/20180119124926.29844-1-michal.wajdeczko@intel.com">https://patchwork.freedesktop.org/patch/msgid/20180119124926.29844-1-michal.wajdeczko@intel.com</a>
Reviewed-by: Michal Winiarski <<a href="mailto:michal.winiarski@intel.com">michal.winiarski@intel.com</a>>
Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>></pre>
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