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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 DUPLICATE - [sna] corrupted images (horizontal lines)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94110">bug 94110</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>DUPLICATE
</td>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - [sna] corrupted images (horizontal lines)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94110#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - [sna] corrupted images (horizontal lines)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94110">bug 94110</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 5eb3e5a5e11d14f9deb2a4b83555443b69ab9940
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Sun Jun 28 09:19:26 2015 +0100
drm/i915: Declare the swizzling unknown for L-shaped configurations
The old style of memory interleaving swizzled upto the end of the
first even bank of memory, and then used the remainder as unswizzled on
the unpaired bank - i.e. swizzling is not constant for all memory. This
causes problems when we try to migrate memory and so the kernel prevents
migration at all when we detect L-shaped inconsistent swizzling.
However, this issue also extends to userspace who try to manually detile
into memory as the swizzling for an individual page is unknown (it
depends on its physical address only known to the kernel), userspace
cannot correctly swizzle.
Note that this is a new attempt for the previously merged one,
reverted in
commit d82c0ba6e306f079407f07003e53c262d683397b
Author: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
Date: Tue Jul 14 12:29:27 2015 +0200
Revert "drm/i915: Declare the swizzling unknown for L-shaped
configurations"
This is cc: stable since we need it to fix up troubles with wc cpu
mmaps that userspace recently started to use widely.
Bugzilla: <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [xf86-video-intel] font/image rendering is broken with sna accel method: incorrect detiling"
href="show_bug.cgi?id=91105">https://bugs.freedesktop.org/show_bug.cgi?id=91105</a>
Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Cc: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
Cc: <a href="mailto:stable@vger.kernel.org">stable@vger.kernel.org</a>
[danvet: Add note about previous (failed attempt).]
Signed-off-by: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
*** This bug has been marked as a duplicate of <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [xf86-video-intel] font/image rendering is broken with sna accel method: incorrect detiling"
href="show_bug.cgi?id=91105">bug 91105</a> ***</pre>
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