1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * debugfs file to track time spent in suspend
4 *
5 * Copyright (c) 2011, Google, Inc.
6 */
7
8#include <linux/debugfs.h>
9#include <linux/err.h>
10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/seq_file.h>
13#include <linux/suspend.h>
14#include <linux/time.h>
15
16#include "timekeeping_internal.h"
17
18#define NUM_BINS 32
19
20static unsigned int sleep_time_bin[NUM_BINS] = {0};
21
22static int tk_debug_sleep_time_show(struct seq_file *s, void *data)
23{
24	unsigned int bin;
25	seq_puts(s, "      time (secs)        count\n");
26	seq_puts(s, "------------------------------\n");
27	for (bin = 0; bin < 32; bin++) {
28		if (sleep_time_bin[bin] == 0)
29			continue;
30		seq_printf(s, "%10u - %-10u %4u\n",
31			bin ? 1 << (bin - 1) : 0, 1 << bin,
32				sleep_time_bin[bin]);
33	}
34	return 0;
35}
36DEFINE_SHOW_ATTRIBUTE(tk_debug_sleep_time);
37
38static int __init tk_debug_sleep_time_init(void)
39{
40	debugfs_create_file("sleep_time", 0444, NULL, NULL,
41			    &tk_debug_sleep_time_fops);
42	return 0;
43}
44late_initcall(tk_debug_sleep_time_init);
45
46void tk_debug_account_sleep_time(const struct timespec64 *t)
47{
48	/* Cap bin index so we don't overflow the array */
49	int bin = min(fls(t->tv_sec), NUM_BINS-1);
50
51	sleep_time_bin[bin]++;
52	pm_deferred_pr_dbg("Timekeeping suspended for %lld.%03lu seconds\n",
53			   (s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC);
54}
55
56