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authorStephane Eranian <eranian@google.com>2013-09-09 12:53:50 -0700
committerIngo Molnar <mingo@kernel.org>2013-09-12 08:42:37 +0200
commitdbc33f7016747bfce64f3d1e3af63f1251fcbf85 (patch)
tree8523036d438767c26acd85da2b083861730b9537 /tools
parent878b5a6efd38030c7a90895dc8346e8fb1e09b4c (diff)
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perf/x86: Fix uncore PCI fixed counter handling
There was a bug in the handling of SNB-EP/IVB-EP uncore PCI fixed counters, e.g., IMC. It would cause erratic values to be returned for the IMC clockticks event. This was due to a bogus hwc->config value which was then written to PCI config space. The erratic values can be seen via: $ perf stat -a -C 0 -e uncore_imc_0/clockticks/ -I 1000 sleep 10 The fixed counter has most fields marked as reserved with hw reset values of 0. Yet the kernel was defaulting to a hwc->config = ~0 and that was causing the issues. This patch sets the hwc->config values for fixed uncore event to 0. Now, the values of IMC clockticks is correct. Signed-off-by: Stephane Eranian <eranian@google.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Cc: peterz@infradead.org Cc: zheng.z.yan@intel.com Link: http://lkml.kernel.org/r/20130909195350.GA17643@google.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools')
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