| 1 | |
| 2 | * debugfs file to track time spent in suspend
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| 3 | *
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| 4 | * Copyright (c) 2011, Google, Inc.
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| 5 | *
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| 6 | * This program is free software; you can redistribute it and/or modify
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| 7 | * it under the terms of the GNU General Public License as published by
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| 8 | * the Free Software Foundation; either version 2 of the License, or
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| 9 | * (at your option) any later version.
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| 10 | *
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| 11 | * This program is distributed in the hope that it will be useful, but WITHOUT
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| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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| 14 | * more details.
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| 15 |
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| 16 |
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| 17 | #include <linux/debugfs.h>
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| 18 | #include <linux/err.h>
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| 19 | #include <linux/init.h>
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| 20 | #include <linux/kernel.h>
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| 21 | #include <linux/seq_file.h>
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| 22 | #include <linux/time.h>
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| 23 |
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| 24 | #include "timekeeping_internal.h"
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| 25 |
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| 26 | static unsigned int sleep_time_bin[32] = {0};
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| 27 |
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| 28 | static int tk_debug_show_sleep_time(struct seq_file *s, void *data)
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| 29 | {
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| 30 | unsigned int bin;
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| 31 | seq_puts(s, " time (secs) count\n");
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| 32 | seq_puts(s, "------------------------------\n");
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| 33 | for (bin = 0; bin < 32; bin++) {
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| 34 | if (sleep_time_bin[bin] == 0)
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| 35 | continue;
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| 36 | seq_printf(s, "%10u - %-10u %4u\n",
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| 37 | bin ? 1 << (bin - 1) : 0, 1 << bin,
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| 38 | sleep_time_bin[bin]);
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| 39 | }
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| 40 | return 0;
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| 41 | }
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| 42 |
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| 43 | static int tk_debug_sleep_time_open(struct inode *inode, struct file *file)
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| 44 | {
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| 45 | return single_open(file, tk_debug_show_sleep_time, NULL);
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| 46 | }
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| 47 |
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| 48 | static const struct file_operations tk_debug_sleep_time_fops = {
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| 49 | .open = tk_debug_sleep_time_open,
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| 50 | .read = seq_read,
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| 51 | .llseek = seq_lseek,
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| 52 | .release = single_release,
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| 53 | };
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| 54 |
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| 55 | static int __init tk_debug_sleep_time_init(void)
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| 56 | {
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| 57 | struct dentry *d;
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| 58 |
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| 59 | d = debugfs_create_file("sleep_time", 0444, NULL, NULL,
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| 60 | &tk_debug_sleep_time_fops);
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| 61 | if (!d) {
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| 62 | pr_err("Failed to create sleep_time debug file\n");
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| 63 | return -ENOMEM;
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| 64 | }
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| 65 |
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| 66 | return 0;
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| 67 | }
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| 68 | late_initcall(tk_debug_sleep_time_init);
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| 69 |
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| 70 | void tk_debug_account_sleep_time(struct timespec64 *t)
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| 71 | {
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| 72 | sleep_time_bin[fls(t->tv_sec)]++;
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| 73 | }
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| 74 |
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