From: Chris Wilson Date: Wed, 10 Jul 2013 12:36:24 +0000 (+0100) Subject: Revert "drm/i915: Workaround incoherence between fences and LLC across multiple CPUs" X-Git-Tag: v3.11-rc2~17^2~2^2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=46a0b638f35b45fc13d3dc0deb6a7e17988170b2;p=pandora-kernel.git Revert "drm/i915: Workaround incoherence between fences and LLC across multiple CPUs" This reverts commit 25ff119 and the follow on for Valleyview commit 2dc8aae. commit 25ff1195f8a0b3724541ae7bbe331b4296de9c06 Author: Chris Wilson Date: Thu Apr 4 21:31:03 2013 +0100 drm/i915: Workaround incoherence between fences and LLC across multiple CPUs commit 2dc8aae06d53458dd3624dc0accd4f81100ee631 Author: Chris Wilson Date: Wed May 22 17:08:06 2013 +0100 drm/i915: Workaround incoherence with fence updates on Valleyview Jon Bloomfield came up with a plausible explanation and cheap fix (drm/i915: Fix incoherence with fence updates on Sandybridge+) for the race condition, so lets run with it. This is a candidate for stable as the old workaround incurs a significant cost (calling wbinvd on all CPUs before performing the register write) for some workloads as noted by Carsten Emde. Link: http://lists.freedesktop.org/archives/intel-gfx/2013-June/028819.html References: https://www.osadl.org/?id=1543#c7602 References: https://bugs.freedesktop.org/show_bug.cgi?id=63825 Signed-off-by: Chris Wilson Cc: Daniel Vetter Cc: Jon Bloomfield Cc: Carsten Emde Cc: stable@vger.kernel.org Signed-off-by: Daniel Vetter --- Reading git-diff-tree failed