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authorVenkatesh Srinivas <venkateshs@google.com>2014-03-13 12:36:26 -0700
committerIngo Molnar <mingo@kernel.org>2014-04-18 12:14:26 +0200
commit24223657806a0ebd0ae5c9caaf7b021091889cf2 (patch)
tree46f5e36797458f19f0fd1f53f6e0ac00de82f00a /tools/perf/builtin-kvm.c
parent6381c24cd6d5d6373620426ab0a96c80ed953e20 (diff)
downloadlinux-24223657806a0ebd0ae5c9caaf7b021091889cf2.tar.gz
perf/x86/intel: Use rdmsrl_safe() when initializing RAPL PMU
CPUs which should support the RAPL counters according to Family/Model/Stepping may still issue #GP when attempting to access the RAPL MSRs. This may happen when Linux is running under KVM and we are passing-through host F/M/S data, for example. Use rdmsrl_safe to first access the RAPL_POWER_UNIT MSR; if this fails, do not attempt to use this PMU. Signed-off-by: Venkatesh Srinivas <venkateshs@google.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1394739386-22260-1-git-send-email-venkateshs@google.com Cc: zheng.z.yan@intel.com Cc: eranian@google.com Cc: ak@linux.intel.com Cc: linux-kernel@vger.kernel.org [ The patch also silently fixes another bug: rapl_pmu_init() didn't handle the memory alloc failure case previously. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/perf/builtin-kvm.c')
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