forked from Minki/linux
30dd568c91
Implement a performance counter with:
attr.type = PERF_TYPE_HARDWARE
attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS
attr.sample_period = 1
Using branch trace store (BTS) on x86 hardware, if available.
The from and to address for each branch can be sampled using:
PERF_SAMPLE_IP for the from address
PERF_SAMPLE_ADDR for the to address
[ v2: address review feedback, fix bugs ]
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
#ifndef _ASM_X86_PERF_COUNTER_H
|
|
#define _ASM_X86_PERF_COUNTER_H
|
|
|
|
/*
|
|
* Performance counter hw details:
|
|
*/
|
|
|
|
#define X86_PMC_MAX_GENERIC 8
|
|
#define X86_PMC_MAX_FIXED 3
|
|
|
|
#define X86_PMC_IDX_GENERIC 0
|
|
#define X86_PMC_IDX_FIXED 32
|
|
#define X86_PMC_IDX_MAX 64
|
|
|
|
#define MSR_ARCH_PERFMON_PERFCTR0 0xc1
|
|
#define MSR_ARCH_PERFMON_PERFCTR1 0xc2
|
|
|
|
#define MSR_ARCH_PERFMON_EVENTSEL0 0x186
|
|
#define MSR_ARCH_PERFMON_EVENTSEL1 0x187
|
|
|
|
#define ARCH_PERFMON_EVENTSEL0_ENABLE (1 << 22)
|
|
#define ARCH_PERFMON_EVENTSEL_INT (1 << 20)
|
|
#define ARCH_PERFMON_EVENTSEL_OS (1 << 17)
|
|
#define ARCH_PERFMON_EVENTSEL_USR (1 << 16)
|
|
|
|
/*
|
|
* Includes eventsel and unit mask as well:
|
|
*/
|
|
#define ARCH_PERFMON_EVENT_MASK 0xffff
|
|
|
|
#define ARCH_PERFMON_UNHALTED_CORE_CYCLES_SEL 0x3c
|
|
#define ARCH_PERFMON_UNHALTED_CORE_CYCLES_UMASK (0x00 << 8)
|
|
#define ARCH_PERFMON_UNHALTED_CORE_CYCLES_INDEX 0
|
|
#define ARCH_PERFMON_UNHALTED_CORE_CYCLES_PRESENT \
|
|
(1 << (ARCH_PERFMON_UNHALTED_CORE_CYCLES_INDEX))
|
|
|
|
#define ARCH_PERFMON_BRANCH_MISSES_RETIRED 6
|
|
|
|
/*
|
|
* Intel "Architectural Performance Monitoring" CPUID
|
|
* detection/enumeration details:
|
|
*/
|
|
union cpuid10_eax {
|
|
struct {
|
|
unsigned int version_id:8;
|
|
unsigned int num_counters:8;
|
|
unsigned int bit_width:8;
|
|
unsigned int mask_length:8;
|
|
} split;
|
|
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:
|
|
*/
|
|
|
|
/*
|
|
* All 3 fixed-mode PMCs are configured via this single MSR:
|
|
*/
|
|
#define MSR_ARCH_PERFMON_FIXED_CTR_CTRL 0x38d
|
|
|
|
/*
|
|
* The counts are available in three separate MSRs:
|
|
*/
|
|
|
|
/* Instr_Retired.Any: */
|
|
#define MSR_ARCH_PERFMON_FIXED_CTR0 0x309
|
|
#define X86_PMC_IDX_FIXED_INSTRUCTIONS (X86_PMC_IDX_FIXED + 0)
|
|
|
|
/* CPU_CLK_Unhalted.Core: */
|
|
#define MSR_ARCH_PERFMON_FIXED_CTR1 0x30a
|
|
#define X86_PMC_IDX_FIXED_CPU_CYCLES (X86_PMC_IDX_FIXED + 1)
|
|
|
|
/* CPU_CLK_Unhalted.Ref: */
|
|
#define MSR_ARCH_PERFMON_FIXED_CTR2 0x30b
|
|
#define X86_PMC_IDX_FIXED_BUS_CYCLES (X86_PMC_IDX_FIXED + 2)
|
|
|
|
/*
|
|
* We model BTS tracing as another fixed-mode PMC.
|
|
*
|
|
* We choose a value in the middle of the fixed counter range, since lower
|
|
* values are used by actual fixed counters and higher values are used
|
|
* to indicate other overflow conditions in the PERF_GLOBAL_STATUS msr.
|
|
*/
|
|
#define X86_PMC_IDX_FIXED_BTS (X86_PMC_IDX_FIXED + 16)
|
|
|
|
|
|
#ifdef CONFIG_PERF_COUNTERS
|
|
extern void init_hw_perf_counters(void);
|
|
extern void perf_counters_lapic_init(void);
|
|
|
|
#define PERF_COUNTER_INDEX_OFFSET 0
|
|
|
|
#else
|
|
static inline void init_hw_perf_counters(void) { }
|
|
static inline void perf_counters_lapic_init(void) { }
|
|
#endif
|
|
|
|
#endif /* _ASM_X86_PERF_COUNTER_H */
|