blob: 238e4be6022955f5b11cefae73b236cb8ba2d39a [file] [log] [blame]
Colin Cross5c835452013-05-21 22:32:14 -07001/*
2 * debugfs file to track time spent in suspend
3 *
4 * Copyright (c) 2011, Google, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 */
16
17#include <linux/debugfs.h>
18#include <linux/err.h>
19#include <linux/init.h>
20#include <linux/kernel.h>
21#include <linux/seq_file.h>
Rafael J. Wysockicb08e032017-07-23 00:03:43 +020022#include <linux/suspend.h>
Colin Cross5c835452013-05-21 22:32:14 -070023#include <linux/time.h>
24
Rashika Kheria64e8d202014-02-27 17:25:54 +053025#include "timekeeping_internal.h"
26
John Stultza4f8f662016-08-23 16:08:22 -070027#define NUM_BINS 32
28
29static unsigned int sleep_time_bin[NUM_BINS] = {0};
Colin Cross5c835452013-05-21 22:32:14 -070030
31static int tk_debug_show_sleep_time(struct seq_file *s, void *data)
32{
33 unsigned int bin;
34 seq_puts(s, " time (secs) count\n");
35 seq_puts(s, "------------------------------\n");
36 for (bin = 0; bin < 32; bin++) {
37 if (sleep_time_bin[bin] == 0)
38 continue;
39 seq_printf(s, "%10u - %-10u %4u\n",
40 bin ? 1 << (bin - 1) : 0, 1 << bin,
41 sleep_time_bin[bin]);
42 }
43 return 0;
44}
45
46static int tk_debug_sleep_time_open(struct inode *inode, struct file *file)
47{
48 return single_open(file, tk_debug_show_sleep_time, NULL);
49}
50
51static const struct file_operations tk_debug_sleep_time_fops = {
52 .open = tk_debug_sleep_time_open,
53 .read = seq_read,
54 .llseek = seq_lseek,
55 .release = single_release,
56};
57
58static int __init tk_debug_sleep_time_init(void)
59{
60 struct dentry *d;
61
62 d = debugfs_create_file("sleep_time", 0444, NULL, NULL,
63 &tk_debug_sleep_time_fops);
64 if (!d) {
65 pr_err("Failed to create sleep_time debug file\n");
66 return -ENOMEM;
67 }
68
69 return 0;
70}
71late_initcall(tk_debug_sleep_time_init);
72
Ondrej Mosnacek985e6952018-07-13 14:06:42 +020073void tk_debug_account_sleep_time(const struct timespec64 *t)
Colin Cross5c835452013-05-21 22:32:14 -070074{
John Stultza4f8f662016-08-23 16:08:22 -070075 /* Cap bin index so we don't overflow the array */
76 int bin = min(fls(t->tv_sec), NUM_BINS-1);
77
78 sleep_time_bin[bin]++;
Rafael J. Wysockicb08e032017-07-23 00:03:43 +020079 pm_deferred_pr_dbg("Timekeeping suspended for %lld.%03lu seconds\n",
80 (s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC);
Colin Cross5c835452013-05-21 22:32:14 -070081}
82