Messages in this thread Patch in this message | | | Date | Wed, 30 Oct 2013 21:31:50 +0200 | From | "Michael S. Tsirkin" <> | Subject | [PATCH] x86: print microcode revision on PEBs errors |
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On Sandy bridge CPUs with old microcode, PEBs fails and suggests a microcode update. Print out the required and the actual revision to make it easier to figure out what's wrong.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- arch/x86/kernel/cpu/perf_event_intel.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c index f31a165..81f2789 100644 --- a/arch/x86/kernel/cpu/perf_event_intel.c +++ b/arch/x86/kernel/cpu/perf_event_intel.c @@ -2105,6 +2105,8 @@ static int intel_snb_pebs_broken(int cpu) } } + pr_info("PEBS checking: microcode 0x%x min legal 0x%x\n", + cpu_data(cpu).microcode, rev); return (cpu_data(cpu).microcode < rev); } -- MST
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