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/*
* debugfs file to track time spent in suspend
*
* Copyright (c) 2011, Google, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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/debugfs.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/seq_file.h>
#include <linux/suspend.h>
#include <linux/time.h>
#include "timekeeping_internal.h"
#define NUM_BINS 32
static unsigned int sleep_time_bin[NUM_BINS] = {0};
static int tk_debug_show_sleep_time(struct seq_file *s, void *data)
{
unsigned int bin;
seq_puts(s, " time (secs) count\n");
seq_puts(s, "------------------------------\n");
for (bin = 0; bin < 32; bin++) {
if (sleep_time_bin[bin] == 0)
continue;
seq_printf(s, "%10u - %-10u %4u\n",
bin ? 1 << (bin - 1) : 0, 1 << bin,
sleep_time_bin[bin]);
}
return 0;
}
static int tk_debug_sleep_time_open(struct inode *inode, struct file *file)
{
return single_open(file, tk_debug_show_sleep_time, NULL);
}
static const struct file_operations tk_debug_sleep_time_fops = {
.open = tk_debug_sleep_time_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init tk_debug_sleep_time_init(void)
{
struct dentry *d;
d = debugfs_create_file("sleep_time", 0444, NULL, NULL,
&tk_debug_sleep_time_fops);
if (!d) {
pr_err("Failed to create sleep_time debug file\n");
return -ENOMEM;
}
return 0;
}
late_initcall(tk_debug_sleep_time_init);
void tk_debug_account_sleep_time(const struct timespec64 *t)
{
/* Cap bin index so we don't overflow the array */
int bin = min(fls(t->tv_sec), NUM_BINS-1);
sleep_time_bin[bin]++;
pm_deferred_pr_dbg("Timekeeping suspended for %lld.%03lu seconds\n",
(s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC);
}
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