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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.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <limits.h>
#include <cpuidle.h>
#include "helpers/helpers.h"
#include "idle_monitor/cpupower-monitor.h"
#define CPUIDLE_STATES_MAX 10
static cstate_t cpuidle_cstates[CPUIDLE_STATES_MAX];
struct cpuidle_monitor cpuidle_sysfs_monitor;
static unsigned long long **previous_count;
static unsigned long long **current_count;
struct timespec start_time;
static unsigned long long timediff;
static int cpuidle_get_count_percent(unsigned int id, double *percent,
unsigned int cpu)
{
unsigned long long statediff = current_count[cpu][id]
- previous_count[cpu][id];
dprint("%s: - diff: %llu - percent: %f (%u)\n",
cpuidle_cstates[id].name, timediff, *percent, cpu);
if (timediff == 0)
*percent = 0.0;
else
*percent = ((100.0 * statediff) / timediff);
dprint("%s: - timediff: %llu - statediff: %llu - percent: %f (%u)\n",
cpuidle_cstates[id].name, timediff, statediff, *percent, cpu);
return 0;
}
static int cpuidle_start(void)
{
int cpu, state;
clock_gettime(CLOCK_REALTIME, &start_time);
for (cpu = 0; cpu < cpu_count; cpu++) {
for (state = 0; state < cpuidle_sysfs_monitor.hw_states_num;
state++) {
previous_count[cpu][state] =
cpuidle_state_time(cpu, state);
dprint("CPU %d - State: %d - Val: %llu\n",
cpu, state, previous_count[cpu][state]);
}
};
return 0;
}
static int cpuidle_stop(void)
{
int cpu, state;
struct timespec end_time;
clock_gettime(CLOCK_REALTIME, &end_time);
timediff = timespec_diff_us(start_time, end_time);
for (cpu = 0; cpu < cpu_count; cpu++) {
for (state = 0; state < cpuidle_sysfs_monitor.hw_states_num;
state++) {
current_count[cpu][state] =
cpuidle_state_time(cpu, state);
dprint("CPU %d - State: %d - Val: %llu\n",
cpu, state, previous_count[cpu][state]);
}
};
return 0;
}
void fix_up_intel_idle_driver_name(char *tmp, int num)
{
/* fix up cpuidle name for intel idle driver */
if (!strncmp(tmp, "NHM-", 4)) {
switch (num) {
case 1:
strcpy(tmp, "C1");
break;
case 2:
strcpy(tmp, "C3");
break;
case 3:
strcpy(tmp, "C6");
break;
}
} else if (!strncmp(tmp, "SNB-", 4)) {
switch (num) {
case 1:
strcpy(tmp, "C1");
break;
case 2:
strcpy(tmp, "C3");
break;
case 3:
strcpy(tmp, "C6");
break;
case 4:
strcpy(tmp, "C7");
break;
}
} else if (!strncmp(tmp, "ATM-", 4)) {
switch (num) {
case 1:
strcpy(tmp, "C1");
break;
case 2:
strcpy(tmp, "C2");
break;
case 3:
strcpy(tmp, "C4");
break;
case 4:
strcpy(tmp, "C6");
break;
}
}
}
static struct cpuidle_monitor *cpuidle_register(void)
{
int num;
char *tmp;
int this_cpu;
this_cpu = sched_getcpu();
/* Assume idle state count is the same for all CPUs */
cpuidle_sysfs_monitor.hw_states_num = cpuidle_state_count(this_cpu);
if (cpuidle_sysfs_monitor.hw_states_num <= 0)
return NULL;
for (num = 0; num < cpuidle_sysfs_monitor.hw_states_num; num++) {
tmp = cpuidle_state_name(this_cpu, num);
if (tmp == NULL)
continue;
fix_up_intel_idle_driver_name(tmp, num);
strncpy(cpuidle_cstates[num].name, tmp, CSTATE_NAME_LEN - 1);
free(tmp);
tmp = cpuidle_state_desc(this_cpu, num);
if (tmp == NULL)
continue;
strncpy(cpuidle_cstates[num].desc, tmp, CSTATE_DESC_LEN - 1);
free(tmp);
cpuidle_cstates[num].range = RANGE_THREAD;
cpuidle_cstates[num].id = num;
cpuidle_cstates[num].get_count_percent =
cpuidle_get_count_percent;
};
/* Free this at program termination */
previous_count = malloc(sizeof(long long *) * cpu_count);
current_count = malloc(sizeof(long long *) * cpu_count);
for (num = 0; num < cpu_count; num++) {
previous_count[num] = malloc(sizeof(long long) *
cpuidle_sysfs_monitor.hw_states_num);
current_count[num] = malloc(sizeof(long long) *
cpuidle_sysfs_monitor.hw_states_num);
}
cpuidle_sysfs_monitor.name_len = strlen(cpuidle_sysfs_monitor.name);
return &cpuidle_sysfs_monitor;
}
void cpuidle_unregister(void)
{
int num;
for (num = 0; num < cpu_count; num++) {
free(previous_count[num]);
free(current_count[num]);
}
free(previous_count);
free(current_count);
}
struct cpuidle_monitor cpuidle_sysfs_monitor = {
.name = "Idle_Stats",
.hw_states = cpuidle_cstates,
.start = cpuidle_start,
.stop = cpuidle_stop,
.do_register = cpuidle_register,
.unregister = cpuidle_unregister,
.needs_root = 0,
.overflow_s = UINT_MAX,
};
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