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 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 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 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