[mirror_ubuntu-zesty-kernel.git] / kernel / time / timekeeping_debug.c

/*
 * debugfs file to track time spent in suspend
 *
 * Copyright (c) 2011, Google, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/seq_file.h>
#include <linux/time.h>

#include "timekeeping_internal.h"

#define NUM_BINS 32

static unsigned int sleep_time_bin[NUM_BINS] = {0};

static int tk_debug_show_sleep_time(struct seq_file *s, void *data)
{
	unsigned int bin;
	seq_puts(s, "      time (secs)        count\n");
	seq_puts(s, "------------------------------\n");
	for (bin = 0; bin < 32; bin++) {
		if (sleep_time_bin[bin] == 0)
			continue;
		seq_printf(s, "%10u - %-10u %4u\n",
			bin ? 1 << (bin - 1) : 0, 1 << bin,
				sleep_time_bin[bin]);
	}
	return 0;
}

static int tk_debug_sleep_time_open(struct inode *inode, struct file *file)
{
	return single_open(file, tk_debug_show_sleep_time, NULL);
}

static const struct file_operations tk_debug_sleep_time_fops = {
	.open		= tk_debug_sleep_time_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int __init tk_debug_sleep_time_init(void)
{
	struct dentry *d;

	d = debugfs_create_file("sleep_time", 0444, NULL, NULL,
		&tk_debug_sleep_time_fops);
	if (!d) {
		pr_err("Failed to create sleep_time debug file\n");
		return -ENOMEM;
	}

	return 0;
}
late_initcall(tk_debug_sleep_time_init);

void tk_debug_account_sleep_time(struct timespec64 *t)
{
	/* Cap bin index so we don't overflow the array */
	int bin = min(fls(t->tv_sec), NUM_BINS-1);

	sleep_time_bin[bin]++;
	printk_deferred(KERN_INFO "Suspended for %lld.%03lu seconds\n",
			(s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC);
}
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>
	22	#include <linux/time.h>
	23
64e8d20b RK	24	#include "timekeeping_internal.h"
64e8d20b RK	25
a4f8f666 JS	26	#define NUM_BINS 32
	27
	28	static unsigned int sleep_time_bin[NUM_BINS] = {0};
5c83545f CC	29
	30	static int tk_debug_show_sleep_time(struct seq_file s, void data)
	31	{
	32	unsigned int bin;
	33	seq_puts(s, " time (secs) count\n");
	34	seq_puts(s, "------------------------------\n");
	35	for (bin = 0; bin < 32; bin++) {
	36	if (sleep_time_bin[bin] == 0)
	37	continue;
	38	seq_printf(s, "%10u - %-10u %4u\n",
	39	bin ? 1 << (bin - 1) : 0, 1 << bin,
	40	sleep_time_bin[bin]);
	41	}
	42	return 0;
	43	}
	44
	45	static int tk_debug_sleep_time_open(struct inode inode, struct file file)
	46	{
	47	return single_open(file, tk_debug_show_sleep_time, NULL);
	48	}
	49
	50	static const struct file_operations tk_debug_sleep_time_fops = {
	51	.open = tk_debug_sleep_time_open,
	52	.read = seq_read,
	53	.llseek = seq_lseek,
	54	.release = single_release,
	55	};
	56
	57	static int __init tk_debug_sleep_time_init(void)
	58	{
	59	struct dentry *d;
	60
	61	d = debugfs_create_file("sleep_time", 0444, NULL, NULL,
	62	&tk_debug_sleep_time_fops);
	63	if (!d) {
	64	pr_err("Failed to create sleep_time debug file\n");
	65	return -ENOMEM;
	66	}
	67
	68	return 0;
	69	}
	70	late_initcall(tk_debug_sleep_time_init);
	71
7d489d15	72	void tk_debug_account_sleep_time(struct timespec64 *t)
5c83545f	73	{
a4f8f666 JS	74	/* Cap bin index so we don't overflow the array */
	75	int bin = min(fls(t->tv_sec), NUM_BINS-1);
	76
	77	sleep_time_bin[bin]++;
f222449c SS	78	printk_deferred(KERN_INFO "Suspended for %lld.%03lu seconds\n",
f222449c SS	79	(s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC);
5c83545f CC	80	}
5c83545f CC	81