From 42089697244ba8e64fa43fb5e6d50d47a8e4cb00 Mon Sep 17 00:00:00 2001 From: "Yan, Zheng" Date: Wed, 4 Jul 2012 14:00:14 +0800 Subject: [PATCH] perf/x86: Detect number of instances of uncore CBox The CBox manages the interface between the core and the LLC, so the instances of uncore CBox is equal to number of cores. Reported-by: Andrew Cooks Signed-off-by: Yan, Zheng Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1341381616-12229-4-git-send-email-zheng.z.yan@intel.com Signed-off-by: Ingo Molnar --- arch/x86/kernel/cpu/perf_event_intel_uncore.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c index 7d755d2..4fecbd0 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c @@ -1605,8 +1605,9 @@ static void __init uncore_cpu_setup(void *dummy) static int __init uncore_cpu_init(void) { - int ret, cpu; + int ret, cpu, max_cores; + max_cores = boot_cpu_data.x86_max_cores; switch (boot_cpu_data.x86_model) { case 26: /* Nehalem */ case 30: @@ -1615,9 +1616,13 @@ static int __init uncore_cpu_init(void) msr_uncores = nhm_msr_uncores; break; case 42: /* Sandy Bridge */ + if (snb_uncore_cbox.num_boxes > max_cores) + snb_uncore_cbox.num_boxes = max_cores; msr_uncores = snb_msr_uncores; break; case 45: /* Sandy Birdge-EP */ + if (snbep_uncore_cbox.num_boxes > max_cores) + snbep_uncore_cbox.num_boxes = max_cores; msr_uncores = snbep_msr_uncores; break; default: -- 2.7.4