Commit | Line | Data |
---|---|---|
5c83545f CC |
1 | /* |
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> | |
cb08e035 | 22 | #include <linux/suspend.h> |
5c83545f CC |
23 | #include <linux/time.h> |
24 | ||
64e8d20b RK |
25 | #include "timekeeping_internal.h" |
26 | ||
a4f8f666 JS |
27 | #define NUM_BINS 32 |
28 | ||
29 | static unsigned int sleep_time_bin[NUM_BINS] = {0}; | |
5c83545f CC |
30 | |
31 | static 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 | ||
46 | static 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 | ||
51 | static 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 | ||
58 | static 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 | } | |
71 | late_initcall(tk_debug_sleep_time_init); | |
72 | ||
7d489d15 | 73 | void tk_debug_account_sleep_time(struct timespec64 *t) |
5c83545f | 74 | { |
a4f8f666 JS |
75 | /* 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]++; | |
cb08e035 RW |
79 | pm_deferred_pr_dbg("Timekeeping suspended for %lld.%03lu seconds\n", |
80 | (s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC); | |
5c83545f CC |
81 | } |
82 |