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Subject[PATCH 3/5] perf/x86: Detect number of instances of uncore CBox
Date
From: "Yan, Zheng" <zheng.z.yan@intel.com>

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 <acooks@gmail.com>
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
---
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 dbbf5a6..a394add 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:
--
1.7.10.4


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