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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> | |
22 | #include <linux/time.h> | |
23 | ||
24 | static unsigned int sleep_time_bin[32] = {0}; | |
25 | ||
26 | static int tk_debug_show_sleep_time(struct seq_file *s, void *data) | |
27 | { | |
28 | unsigned int bin; | |
29 | seq_puts(s, " time (secs) count\n"); | |
30 | seq_puts(s, "------------------------------\n"); | |
31 | for (bin = 0; bin < 32; bin++) { | |
32 | if (sleep_time_bin[bin] == 0) | |
33 | continue; | |
34 | seq_printf(s, "%10u - %-10u %4u\n", | |
35 | bin ? 1 << (bin - 1) : 0, 1 << bin, | |
36 | sleep_time_bin[bin]); | |
37 | } | |
38 | return 0; | |
39 | } | |
40 | ||
41 | static int tk_debug_sleep_time_open(struct inode *inode, struct file *file) | |
42 | { | |
43 | return single_open(file, tk_debug_show_sleep_time, NULL); | |
44 | } | |
45 | ||
46 | static const struct file_operations tk_debug_sleep_time_fops = { | |
47 | .open = tk_debug_sleep_time_open, | |
48 | .read = seq_read, | |
49 | .llseek = seq_lseek, | |
50 | .release = single_release, | |
51 | }; | |
52 | ||
53 | static int __init tk_debug_sleep_time_init(void) | |
54 | { | |
55 | struct dentry *d; | |
56 | ||
57 | d = debugfs_create_file("sleep_time", 0444, NULL, NULL, | |
58 | &tk_debug_sleep_time_fops); | |
59 | if (!d) { | |
60 | pr_err("Failed to create sleep_time debug file\n"); | |
61 | return -ENOMEM; | |
62 | } | |
63 | ||
64 | return 0; | |
65 | } | |
66 | late_initcall(tk_debug_sleep_time_init); | |
67 | ||
68 | void tk_debug_account_sleep_time(struct timespec *t) | |
69 | { | |
70 | sleep_time_bin[fls(t->tv_sec)]++; | |
71 | } | |
72 |