blob: 675febb47b1ee6dcb369bd8d9d8c231d7169a086 [file] [log] [blame]
/* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/proc_fs.h>
#include "pm.h"
struct msm_pm_time_stats {
const char *name;
int64_t first_bucket_time;
int bucket[CONFIG_MSM_IDLE_STATS_BUCKET_COUNT];
int64_t min_time[CONFIG_MSM_IDLE_STATS_BUCKET_COUNT];
int64_t max_time[CONFIG_MSM_IDLE_STATS_BUCKET_COUNT];
int count;
int64_t total_time;
bool enabled;
};
struct msm_pm_cpu_time_stats {
struct msm_pm_time_stats stats[MSM_PM_STAT_COUNT];
};
static DEFINE_SPINLOCK(msm_pm_stats_lock);
static DEFINE_PER_CPU_SHARED_ALIGNED(
struct msm_pm_cpu_time_stats, msm_pm_stats);
/*
* Add the given time data to the statistics collection.
*/
void msm_pm_add_stat(enum msm_pm_time_stats_id id, int64_t t)
{
unsigned long flags;
struct msm_pm_time_stats *stats;
int64_t bt;
int i;
spin_lock_irqsave(&msm_pm_stats_lock, flags);
stats = __get_cpu_var(msm_pm_stats).stats;
if (!stats[id].enabled)
goto add_bail;
stats[id].total_time += t;
stats[id].count++;
bt = t;
do_div(bt, stats[id].first_bucket_time);
if (bt < 1ULL << (CONFIG_MSM_IDLE_STATS_BUCKET_SHIFT *
(CONFIG_MSM_IDLE_STATS_BUCKET_COUNT - 1)))
i = DIV_ROUND_UP(fls((uint32_t)bt),
CONFIG_MSM_IDLE_STATS_BUCKET_SHIFT);
else
i = CONFIG_MSM_IDLE_STATS_BUCKET_COUNT - 1;
if (i >= CONFIG_MSM_IDLE_STATS_BUCKET_COUNT)
i = CONFIG_MSM_IDLE_STATS_BUCKET_COUNT - 1;
stats[id].bucket[i]++;
if (t < stats[id].min_time[i] || !stats[id].max_time[i])
stats[id].min_time[i] = t;
if (t > stats[id].max_time[i])
stats[id].max_time[i] = t;
add_bail:
spin_unlock_irqrestore(&msm_pm_stats_lock, flags);
}
/*
* Helper function of snprintf where buf is auto-incremented, size is auto-
* decremented, and there is no return value.
*
* NOTE: buf and size must be l-values (e.g. variables)
*/
#define SNPRINTF(buf, size, format, ...) \
do { \
if (size > 0) { \
int ret; \
ret = snprintf(buf, size, format, ## __VA_ARGS__); \
if (ret > size) { \
buf += size; \
size = 0; \
} else { \
buf += ret; \
size -= ret; \
} \
} \
} while (0)
/*
* Write out the power management statistics.
*/
static int msm_pm_read_proc
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
unsigned int cpu = off / MSM_PM_STAT_COUNT;
int id = off % MSM_PM_STAT_COUNT;
char *p = page;
if (count < 1024) {
*start = (char *) 0;
*eof = 0;
return 0;
}
if (cpu < num_possible_cpus()) {
unsigned long flags;
struct msm_pm_time_stats *stats;
int i;
int64_t bucket_time;
int64_t s;
uint32_t ns;
spin_lock_irqsave(&msm_pm_stats_lock, flags);
stats = per_cpu(msm_pm_stats, cpu).stats;
/* Skip the disabled ones */
if (!stats[id].enabled) {
*p = '\0';
p++;
goto again;
}
s = stats[id].total_time;
ns = do_div(s, NSEC_PER_SEC);
SNPRINTF(p, count,
"[cpu %u] %s:\n"
" count: %7d\n"
" total_time: %lld.%09u\n",
cpu, stats[id].name,
stats[id].count,
s, ns);
bucket_time = stats[id].first_bucket_time;
for (i = 0; i < CONFIG_MSM_IDLE_STATS_BUCKET_COUNT - 1; i++) {
s = bucket_time;
ns = do_div(s, NSEC_PER_SEC);
SNPRINTF(p, count,
" <%6lld.%09u: %7d (%lld-%lld)\n",
s, ns, stats[id].bucket[i],
stats[id].min_time[i],
stats[id].max_time[i]);
bucket_time <<= CONFIG_MSM_IDLE_STATS_BUCKET_SHIFT;
}
SNPRINTF(p, count, " >=%6lld.%09u: %7d (%lld-%lld)\n",
s, ns, stats[id].bucket[i],
stats[id].min_time[i],
stats[id].max_time[i]);
again:
*start = (char *) 1;
*eof = (off + 1 >= MSM_PM_STAT_COUNT * num_possible_cpus());
spin_unlock_irqrestore(&msm_pm_stats_lock, flags);
}
return p - page;
}
#undef SNPRINTF
#define MSM_PM_STATS_RESET "reset"
/*
* Reset the power management statistics values.
*/
static int msm_pm_write_proc(struct file *file, const char __user *buffer,
unsigned long count, void *data)
{
char buf[sizeof(MSM_PM_STATS_RESET)];
int ret;
unsigned long flags;
unsigned int cpu;
size_t len = strnlen(MSM_PM_STATS_RESET, sizeof(MSM_PM_STATS_RESET));
if (count < sizeof(MSM_PM_STATS_RESET)) {
ret = -EINVAL;
goto write_proc_failed;
}
if (copy_from_user(buf, buffer, len)) {
ret = -EFAULT;
goto write_proc_failed;
}
if (strncmp(buf, MSM_PM_STATS_RESET, len)) {
ret = -EINVAL;
goto write_proc_failed;
}
spin_lock_irqsave(&msm_pm_stats_lock, flags);
for_each_possible_cpu(cpu) {
struct msm_pm_time_stats *stats;
int i;
stats = per_cpu(msm_pm_stats, cpu).stats;
for (i = 0; i < MSM_PM_STAT_COUNT; i++) {
memset(stats[i].bucket,
0, sizeof(stats[i].bucket));
memset(stats[i].min_time,
0, sizeof(stats[i].min_time));
memset(stats[i].max_time,
0, sizeof(stats[i].max_time));
stats[i].count = 0;
stats[i].total_time = 0;
}
}
spin_unlock_irqrestore(&msm_pm_stats_lock, flags);
return count;
write_proc_failed:
return ret;
}
#undef MSM_PM_STATS_RESET
void msm_pm_add_stats(enum msm_pm_time_stats_id *enable_stats, int size)
{
unsigned int cpu;
struct proc_dir_entry *d_entry;
int i = 0;
for_each_possible_cpu(cpu) {
struct msm_pm_time_stats *stats =
per_cpu(msm_pm_stats, cpu).stats;
stats[MSM_PM_STAT_REQUESTED_IDLE].name = "idle-request";
stats[MSM_PM_STAT_REQUESTED_IDLE].first_bucket_time =
CONFIG_MSM_IDLE_STATS_FIRST_BUCKET;
stats[MSM_PM_STAT_IDLE_SPIN].name = "idle-spin";
stats[MSM_PM_STAT_IDLE_SPIN].first_bucket_time =
CONFIG_MSM_IDLE_STATS_FIRST_BUCKET;
stats[MSM_PM_STAT_IDLE_WFI].name = "idle-wfi";
stats[MSM_PM_STAT_IDLE_WFI].first_bucket_time =
CONFIG_MSM_IDLE_STATS_FIRST_BUCKET;
stats[MSM_PM_STAT_RETENTION].name = "retention";
stats[MSM_PM_STAT_RETENTION].first_bucket_time =
CONFIG_MSM_IDLE_STATS_FIRST_BUCKET;
stats[MSM_PM_STAT_IDLE_STANDALONE_POWER_COLLAPSE].name =
"idle-standalone-power-collapse";
stats[MSM_PM_STAT_IDLE_STANDALONE_POWER_COLLAPSE].
first_bucket_time = CONFIG_MSM_IDLE_STATS_FIRST_BUCKET;
stats[MSM_PM_STAT_IDLE_FAILED_STANDALONE_POWER_COLLAPSE].name =
"idle-failed-standalone-power-collapse";
stats[MSM_PM_STAT_IDLE_FAILED_STANDALONE_POWER_COLLAPSE].
first_bucket_time =
CONFIG_MSM_IDLE_STATS_FIRST_BUCKET;
stats[MSM_PM_STAT_IDLE_POWER_COLLAPSE].name =
"idle-power-collapse";
stats[MSM_PM_STAT_IDLE_POWER_COLLAPSE].first_bucket_time =
CONFIG_MSM_IDLE_STATS_FIRST_BUCKET;
stats[MSM_PM_STAT_IDLE_FAILED_POWER_COLLAPSE].name =
"idle-failed-power-collapse";
stats[MSM_PM_STAT_IDLE_FAILED_POWER_COLLAPSE].
first_bucket_time =
CONFIG_MSM_IDLE_STATS_FIRST_BUCKET;
stats[MSM_PM_STAT_SUSPEND].name = "suspend";
stats[MSM_PM_STAT_SUSPEND].first_bucket_time =
CONFIG_MSM_SUSPEND_STATS_FIRST_BUCKET;
stats[MSM_PM_STAT_FAILED_SUSPEND].name = "failed-suspend";
stats[MSM_PM_STAT_FAILED_SUSPEND].first_bucket_time =
CONFIG_MSM_IDLE_STATS_FIRST_BUCKET;
stats[MSM_PM_STAT_NOT_IDLE].name = "not-idle";
stats[MSM_PM_STAT_NOT_IDLE].first_bucket_time =
CONFIG_MSM_IDLE_STATS_FIRST_BUCKET;
for (i = 0; i < size; i++)
stats[enable_stats[i]].enabled = true;
}
d_entry = create_proc_entry("msm_pm_stats",
S_IRUGO | S_IWUSR | S_IWGRP, NULL);
if (d_entry) {
d_entry->read_proc = msm_pm_read_proc;
d_entry->write_proc = msm_pm_write_proc;
d_entry->data = NULL;
}
}