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 #include "timekeeping_internal.h" 25 26 static unsigned int sleep_time_bin[32] = {0}; 27 28 static int tk_debug_show_sleep_time(struct seq_file *s, void *data) 29 { 30 unsigned int bin; 31 seq_puts(s, " time (secs) count\n"); 32 seq_puts(s, "------------------------------\n"); 33 for (bin = 0; bin < 32; bin++) { 34 if (sleep_time_bin[bin] == 0) 35 continue; 36 seq_printf(s, "%10u - %-10u %4u\n", 37 bin ? 1 << (bin - 1) : 0, 1 << bin, 38 sleep_time_bin[bin]); 39 } 40 return 0; 41 } 42 43 static int tk_debug_sleep_time_open(struct inode *inode, struct file *file) 44 { 45 return single_open(file, tk_debug_show_sleep_time, NULL); 46 } 47 48 static const struct file_operations tk_debug_sleep_time_fops = { 49 .open = tk_debug_sleep_time_open, 50 .read = seq_read, 51 .llseek = seq_lseek, 52 .release = single_release, 53 }; 54 55 static int __init tk_debug_sleep_time_init(void) 56 { 57 struct dentry *d; 58 59 d = debugfs_create_file("sleep_time", 0444, NULL, NULL, 60 &tk_debug_sleep_time_fops); 61 if (!d) { 62 pr_err("Failed to create sleep_time debug file\n"); 63 return -ENOMEM; 64 } 65 66 return 0; 67 } 68 late_initcall(tk_debug_sleep_time_init); 69 70 void tk_debug_account_sleep_time(struct timespec64 *t) 71 { 72 sleep_time_bin[fls(t->tv_sec)]++; 73 } 74 75