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68 lines · 1.6 KiB

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
20/* Incremented every time mg_floor is updated */
21DEFINE_PER_CPU(unsigned long, timekeeping_mg_floor_swaps);
22
23static unsigned int sleep_time_bin[NUM_BINS] = {0};
24
25static int tk_debug_sleep_time_show(struct seq_file *s, void *data)
26{
27 unsigned int bin;
28 seq_puts(s, " time (secs) count\n");
29 seq_puts(s, "------------------------------\n");
30 for (bin = 0; bin < 32; bin++) {
31 if (sleep_time_bin[bin] == 0)
32 continue;
33 seq_printf(s, "%10u - %-10u %4u\n",
34 bin ? 1 << (bin - 1) : 0, 1 << bin,
35 sleep_time_bin[bin]);
36 }
37 return 0;
38}
39DEFINE_SHOW_ATTRIBUTE(tk_debug_sleep_time);
40
41static int __init tk_debug_sleep_time_init(void)
42{
43 debugfs_create_file("sleep_time", 0444, NULL, NULL,
44 &tk_debug_sleep_time_fops);
45 return 0;
46}
47late_initcall(tk_debug_sleep_time_init);
48
49void tk_debug_account_sleep_time(const struct timespec64 *t)
50{
51 /* Cap bin index so we don't overflow the array */
52 int bin = min(fls(t->tv_sec), NUM_BINS-1);
53
54 sleep_time_bin[bin]++;
55 pm_deferred_pr_dbg("Timekeeping suspended for %lld.%03lu seconds\n",
56 (s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC);
57}
58
59unsigned long timekeeping_get_mg_floor_swaps(void)
60{
61 unsigned long sum = 0;
62 int cpu;
63
64 for_each_possible_cpu(cpu)
65 sum += data_race(per_cpu(timekeeping_mg_floor_swaps, cpu));
66
67 return sum;
68}