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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 - [regression] [i915] DMAR Errors Spamming Logs"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96584">bug 96584</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;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr>
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<td style="text-align:right;">Status</td>
<td>ASSIGNED
</td>
<td>RESOLVED
</td>
</tr></table>
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<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [regression] [i915] DMAR Errors Spamming Logs"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96584#c19">Comment # 19</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [regression] [i915] DMAR Errors Spamming Logs"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96584">bug 96584</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 48f112fed3b07858f1b3a78548d23320fb96747b
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Fri Jun 24 14:07:14 2016 +0100
drm/i915: Fill unused GGTT with scratch pages for VT-d
One of the numerous VT-d workarounds we require is that the display
hardware reads past the end of the buffer triggering VT-d faults. This
is acknowledged in the code as being safe "since we fill the unused
portions of the GGTT with the scratch page". Alas, that is no longer
always true and so we trigger DMAR read faults.
Skylake also requires another workaround to avoid mixing VT-d and
unpopulated PTE, and so there we also need to ensure we fill unused
entries with the scratch page.
Reported-by: Mike Lothian <<a href="mailto:mike@fireburn.co.uk">mike@fireburn.co.uk</a>>
Bugzilla: <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [regression] [i915] DMAR Errors Spamming Logs"
href="show_bug.cgi?id=96584">https://bugs.freedesktop.org/show_bug.cgi?id=96584</a>
Fixes: f7770bfd9fd2 ("drm/i915: Skip clearing the GGTT on full-ppgtt
systems")
Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Cc: David Weinehall <<a href="mailto:david.weinehall@intel.com">david.weinehall@intel.com</a>>
Cc: Joonas Lahtinen <<a href="mailto:joonas.lahtinen@linux.intel.com">joonas.lahtinen@linux.intel.com</a>>
Link:
<a href="http://patchwork.freedesktop.org/patch/msgid/1466773634-8106-1-git-send-email-chris@chris-wilson.co.uk">http://patchwork.freedesktop.org/patch/msgid/1466773634-8106-1-git-send-email-chris@chris-wilson.co.uk</a>
Reviewed-by: David Weinehall <<a href="mailto:david.weinehall@intel.com">david.weinehall@intel.com</a>></pre>
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