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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 BYT] Sporadic failure from igt/gem_exec_flush@basic-batch-kernel-default-cmd"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95372">bug 95372</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [BAT BYT] Sporadic failure from igt/gem_exec_flush@basic-batch-kernel-default-cmd"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95372#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [BAT BYT] Sporadic failure from igt/gem_exec_flush@basic-batch-kernel-default-cmd"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95372">bug 95372</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 3b5724d702ef24ee41ca008a1fab1cf94f3d31b5
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Thu Aug 18 17:16:49 2016 +0100
drm/i915: Wait for writes through the GTT to land before reading back
If we quickly switch from writing through the GTT to a read of the
physical page directly with the CPU (e.g. performing relocations through
the GTT and then running the command parser), we can observe that the
writes are not visible to the CPU. It is not a coherency problem, as
extensive investigations with clflush have demonstrated, but a mere
timing issue - we have to wait for the GTT to complete it's write before
we start our read from the CPU.</pre>
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