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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - gen7_queue_flip doesn't work on RCS"
href="https://bugs.freedesktop.org/show_bug.cgi?id=67600">67600</a>
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</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>gen7_queue_flip doesn't work on RCS
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>marchesin@icps.u-strasbg.fr
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=83409" name="attach_83409" title="i915_error_state">attachment 83409</a> <a href="attachment.cgi?id=83409&action=edit" title="i915_error_state">[details]</a></span>
i915_error_state
I noticed that on IVB, page flips ioctls end up blocking when the GPU is busy.
Specifically the RCS -> BCS ring switch seems to be what's taking time (this
time is spent in i915_gem_object_pin_to_display_plane).
When I try to use the RCS instead of the BCS ring (by changing gen7_queue_flip)
on my IVB chromebook (8086:0166) I get GPU lockups. Attached is the
i915_error_state (undecoded).</pre>
</div>
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