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authorIngo Molnar <mingo@elte.hu>2008-12-17 10:51:15 +0100
committerIngo Molnar <mingo@elte.hu>2008-12-23 12:45:11 +0100
commit703e937c83bbad79075a7846e062e447c2fee6a4 (patch)
tree7c3e23179f14c32368213024be20dcf27bb6e7a8 /arch
parenteb2b861810d4ff72454c83996b891df4e0aaff9a (diff)
perfcounters: add fixed-mode PMC enumeration
Enumerate fixed-mode PMCs based on CPUID, and feed that into the perfcounter code. Does not use fixed-mode PMCs yet. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/perf_counter.h23
-rw-r--r--arch/x86/kernel/cpu/perf_counter.c23
2 files changed, 40 insertions, 6 deletions
diff --git a/arch/x86/include/asm/perf_counter.h b/arch/x86/include/asm/perf_counter.h
index dd5a4a559e2..945a315e6d6 100644
--- a/arch/x86/include/asm/perf_counter.h
+++ b/arch/x86/include/asm/perf_counter.h
@@ -41,6 +41,29 @@ union cpuid10_eax {
unsigned int full;
};
+union cpuid10_edx {
+ struct {
+ unsigned int num_counters_fixed:4;
+ unsigned int reserved:28;
+ } split;
+ unsigned int full;
+};
+
+
+/*
+ * Fixed-purpose performance counters:
+ */
+
+/* Instr_Retired.Any: */
+#define MSR_ARCH_PERFMON_FIXED_CTR0 0x309
+
+/* CPU_CLK_Unhalted.Core: */
+#define MSR_ARCH_PERFMON_FIXED_CTR1 0x30a
+
+/* CPU_CLK_Unhalted.Ref: */
+#define MSR_ARCH_PERFMON_FIXED_CTR2 0x30b
+
+
#ifdef CONFIG_PERF_COUNTERS
extern void init_hw_perf_counters(void);
extern void perf_counters_lapic_init(int nmi);
diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index fc3af868823..2fca50c4597 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -27,6 +27,8 @@ static bool perf_counters_initialized __read_mostly;
static int nr_hw_counters __read_mostly;
static u32 perf_counter_mask __read_mostly;
+static int nr_hw_counters_fixed __read_mostly;
+
struct cpu_hw_counters {
struct perf_counter *generic[X86_PMC_MAX_GENERIC];
unsigned long used[BITS_TO_LONGS(X86_PMC_MAX_GENERIC)];
@@ -519,8 +521,9 @@ static __read_mostly struct notifier_block perf_counter_nmi_notifier = {
void __init init_hw_perf_counters(void)
{
union cpuid10_eax eax;
- unsigned int unused;
unsigned int ebx;
+ unsigned int unused;
+ union cpuid10_edx edx;
if (!cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON))
return;
@@ -529,14 +532,14 @@ void __init init_hw_perf_counters(void)
* Check whether the Architectural PerfMon supports
* Branch Misses Retired Event or not.
*/
- cpuid(10, &(eax.full), &ebx, &unused, &unused);
+ cpuid(10, &eax.full, &ebx, &unused, &edx.full);
if (eax.split.mask_length <= ARCH_PERFMON_BRANCH_MISSES_RETIRED)
return;
printk(KERN_INFO "Intel Performance Monitoring support detected.\n");
- printk(KERN_INFO "... version: %d\n", eax.split.version_id);
- printk(KERN_INFO "... num_counters: %d\n", eax.split.num_counters);
+ printk(KERN_INFO "... version: %d\n", eax.split.version_id);
+ printk(KERN_INFO "... num counters: %d\n", eax.split.num_counters);
nr_hw_counters = eax.split.num_counters;
if (nr_hw_counters > X86_PMC_MAX_GENERIC) {
nr_hw_counters = X86_PMC_MAX_GENERIC;
@@ -546,8 +549,16 @@ void __init init_hw_perf_counters(void)
perf_counter_mask = (1 << nr_hw_counters) - 1;
perf_max_counters = nr_hw_counters;
- printk(KERN_INFO "... bit_width: %d\n", eax.split.bit_width);
- printk(KERN_INFO "... mask_length: %d\n", eax.split.mask_length);
+ printk(KERN_INFO "... bit width: %d\n", eax.split.bit_width);
+ printk(KERN_INFO "... mask length: %d\n", eax.split.mask_length);
+
+ nr_hw_counters_fixed = edx.split.num_counters_fixed;
+ if (nr_hw_counters_fixed > X86_PMC_MAX_FIXED) {
+ nr_hw_counters_fixed = X86_PMC_MAX_FIXED;
+ WARN(1, KERN_ERR "hw perf counters fixed %d > max(%d), clipping!",
+ nr_hw_counters_fixed, X86_PMC_MAX_FIXED);
+ }
+ printk(KERN_INFO "... fixed counters: %d\n", nr_hw_counters_fixed);
perf_counters_initialized = true;