nhm_idle.c
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/*
* (C) 2010,2011 Thomas Renninger <trenn@suse.de>, Novell Inc.
*
* Licensed under the terms of the GNU GPL License version 2.
*
* Based on Len Brown's <lenb@kernel.org> turbostat tool.
*/
#if defined(__i386__) || defined(__x86_64__)
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "helpers/helpers.h"
#include "idle_monitor/cpupower-monitor.h"
#define MSR_PKG_C3_RESIDENCY 0x3F8
#define MSR_PKG_C6_RESIDENCY 0x3F9
#define MSR_CORE_C3_RESIDENCY 0x3FC
#define MSR_CORE_C6_RESIDENCY 0x3FD
#define MSR_TSC 0x10
#define NHM_CSTATE_COUNT 4
enum intel_nhm_id { C3 = 0, C6, PC3, PC6, TSC = 0xFFFF };
static int nhm_get_count_percent(unsigned int self_id, double *percent,
unsigned int cpu);
static cstate_t nhm_cstates[NHM_CSTATE_COUNT] = {
{
.name = "C3",
.desc = N_("Processor Core C3"),
.id = C3,
.range = RANGE_CORE,
.get_count_percent = nhm_get_count_percent,
},
{
.name = "C6",
.desc = N_("Processor Core C6"),
.id = C6,
.range = RANGE_CORE,
.get_count_percent = nhm_get_count_percent,
},
{
.name = "PC3",
.desc = N_("Processor Package C3"),
.id = PC3,
.range = RANGE_PACKAGE,
.get_count_percent = nhm_get_count_percent,
},
{
.name = "PC6",
.desc = N_("Processor Package C6"),
.id = PC6,
.range = RANGE_PACKAGE,
.get_count_percent = nhm_get_count_percent,
},
};
static unsigned long long tsc_at_measure_start;
static unsigned long long tsc_at_measure_end;
static unsigned long long *previous_count[NHM_CSTATE_COUNT];
static unsigned long long *current_count[NHM_CSTATE_COUNT];
/* valid flag for all CPUs. If a MSR read failed it will be zero */
static int *is_valid;
static int nhm_get_count(enum intel_nhm_id id, unsigned long long *val,
unsigned int cpu)
{
int msr;
switch (id) {
case C3:
msr = MSR_CORE_C3_RESIDENCY;
break;
case C6:
msr = MSR_CORE_C6_RESIDENCY;
break;
case PC3:
msr = MSR_PKG_C3_RESIDENCY;
break;
case PC6:
msr = MSR_PKG_C6_RESIDENCY;
break;
case TSC:
msr = MSR_TSC;
break;
default:
return -1;
};
if (read_msr(cpu, msr, val))
return -1;
return 0;
}
static int nhm_get_count_percent(unsigned int id, double *percent,
unsigned int cpu)
{
*percent = 0.0;
if (!is_valid[cpu])
return -1;
*percent = (100.0 *
(current_count[id][cpu] - previous_count[id][cpu])) /
(tsc_at_measure_end - tsc_at_measure_start);
dprint("%s: previous: %llu - current: %llu - (%u)\n",
nhm_cstates[id].name, previous_count[id][cpu],
current_count[id][cpu], cpu);
dprint("%s: tsc_diff: %llu - count_diff: %llu - percent: %2.f (%u)\n",
nhm_cstates[id].name,
(unsigned long long) tsc_at_measure_end - tsc_at_measure_start,
current_count[id][cpu] - previous_count[id][cpu],
*percent, cpu);
return 0;
}
static int nhm_start(void)
{
int num, cpu;
unsigned long long dbg, val;
nhm_get_count(TSC, &tsc_at_measure_start, 0);
for (num = 0; num < NHM_CSTATE_COUNT; num++) {
for (cpu = 0; cpu < cpu_count; cpu++) {
is_valid[cpu] = !nhm_get_count(num, &val, cpu);
previous_count[num][cpu] = val;
}
}
nhm_get_count(TSC, &dbg, 0);
dprint("TSC diff: %llu\n", dbg - tsc_at_measure_start);
return 0;
}
static int nhm_stop(void)
{
unsigned long long val;
unsigned long long dbg;
int num, cpu;
nhm_get_count(TSC, &tsc_at_measure_end, 0);
for (num = 0; num < NHM_CSTATE_COUNT; num++) {
for (cpu = 0; cpu < cpu_count; cpu++) {
is_valid[cpu] = !nhm_get_count(num, &val, cpu);
current_count[num][cpu] = val;
}
}
nhm_get_count(TSC, &dbg, 0);
dprint("TSC diff: %llu\n", dbg - tsc_at_measure_end);
return 0;
}
struct cpuidle_monitor intel_nhm_monitor;
struct cpuidle_monitor *intel_nhm_register(void)
{
int num;
if (cpupower_cpu_info.vendor != X86_VENDOR_INTEL)
return NULL;
if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_INV_TSC))
return NULL;
if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_APERF))
return NULL;
/* Free this at program termination */
is_valid = calloc(cpu_count, sizeof(int));
for (num = 0; num < NHM_CSTATE_COUNT; num++) {
previous_count[num] = calloc(cpu_count,
sizeof(unsigned long long));
current_count[num] = calloc(cpu_count,
sizeof(unsigned long long));
}
intel_nhm_monitor.name_len = strlen(intel_nhm_monitor.name);
return &intel_nhm_monitor;
}
void intel_nhm_unregister(void)
{
int num;
for (num = 0; num < NHM_CSTATE_COUNT; num++) {
free(previous_count[num]);
free(current_count[num]);
}
free(is_valid);
}
struct cpuidle_monitor intel_nhm_monitor = {
.name = "Nehalem",
.hw_states_num = NHM_CSTATE_COUNT,
.hw_states = nhm_cstates,
.start = nhm_start,
.stop = nhm_stop,
.do_register = intel_nhm_register,
.unregister = intel_nhm_unregister,
.needs_root = 1,
.overflow_s = 922000000 /* 922337203 seconds TSC overflow
at 20GHz */
};
#endif