From: Andi Kleen <ak@linux.intel.com>
Date: Tue, 4 Nov 2014 01:00:28 +0000 (-0800)
Subject: perf/x86/intel/uncore: Fix boot crash on SBOX PMU on Haswell-EP
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~95^2
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=68055915c1c22489f9658bd2b7391bb11b2cf4e4;p=pandora-kernel.git

perf/x86/intel/uncore: Fix boot crash on SBOX PMU on Haswell-EP

There were several reports that on some systems writing the SBOX0 PMU
initialization MSR would #GP at boot. This did not happen on all
systems -- my two test systems booted fine.

Writing the three initialization bits bit-by-bit seems to avoid the
problem. So add a special callback to do just that.

This replaces an earlier patch that disabled the SBOX.

Reported-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Reported-and-Tested-by: Patrick Lu <patrick.lu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Link: http://lkml.kernel.org/r/1415062828-19759-4-git-send-email-andi@firstfloor.org
[ Fixed a whitespace error and added attribution tags that were left out inexplicably. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

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