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 static unsigned int sleep_time_bin[NUM_BINS] = {0};
21
tk_debug_sleep_time_show(struct seq_file * s,void * data)22 static 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 }
36 DEFINE_SHOW_ATTRIBUTE(tk_debug_sleep_time);
37
tk_debug_sleep_time_init(void)38 static 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 }
44 late_initcall(tk_debug_sleep_time_init);
45
tk_debug_account_sleep_time(const struct timespec64 * t)46 void 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