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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 - [CI][BAT] igt@drv_selftest@live_coherency - dmesg-fail - Value[9/31] mismatch, (overwrite with gtt) wrote [gpu] fcf5ab91 read [cpu] 30a546e (inverse 30a546e), at offset cc"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107514">bug 107514</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [CI][BAT] igt@drv_selftest@live_coherency - dmesg-fail - Value[9/31] mismatch, (overwrite with gtt) wrote [gpu] fcf5ab91 read [cpu] 30a546e (inverse 30a546e), at offset cc"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107514#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [CI][BAT] igt@drv_selftest@live_coherency - dmesg-fail - Value[9/31] mismatch, (overwrite with gtt) wrote [gpu] fcf5ab91 read [cpu] 30a546e (inverse 30a546e), at offset cc"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107514">bug 107514</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 f6844a85e0c96a55c61fa3e611f414999b11e4de
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Mon Jul 30 08:53:51 2018 +0100
drm/i915/selftests: Replace opencoded clflush with drm_clflush_virt_range
We occasionally see that the clflush prior to a read of GPU data is
returning stale data, reminiscent of much earlier bugs fixed by adding a
second clflush for serialisation. As drm_clflush_virt_range() already
supplies the workaround, use it rather than open code the clflush
instruction.
References: 396f5d62d1a5 ("drm: Restore double clflush on the last partial
cacheline")
Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Reviewed-by: Matthew Auld <<a href="mailto:matthew.auld@intel.com">matthew.auld@intel.com</a>>
Link:
<a href="https://patchwork.freedesktop.org/patch/msgid/20180730075351.15569-3-chris@chris-wilson.co.uk">https://patchwork.freedesktop.org/patch/msgid/20180730075351.15569-3-chris@chris-wilson.co.uk</a></pre>
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