[linux-2.6-block.git] / arch / mips / mm / sc-debugfs.c

/*
 * Copyright (C) 2015 Imagination Technologies
 * Author: Paul Burton <paul.burton@mips.com>
 *
 * 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.
 */

#include <asm/bcache.h>
#include <asm/debug.h>
#include <linux/uaccess.h>
#include <linux/debugfs.h>
#include <linux/init.h>

static ssize_t sc_prefetch_read(struct file *file, char __user *user_buf,
				size_t count, loff_t *ppos)
{
	bool enabled = bc_prefetch_is_enabled();
	char buf[3];

	buf[0] = enabled ? 'Y' : 'N';
	buf[1] = '\n';
	buf[2] = 0;

	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
}

static ssize_t sc_prefetch_write(struct file *file,
				 const char __user *user_buf,
				 size_t count, loff_t *ppos)
{
	bool enabled;
	int err;

	err = kstrtobool_from_user(user_buf, count, &enabled);
	if (err)
		return err;

	if (enabled)
		bc_prefetch_enable();
	else
		bc_prefetch_disable();

	return count;
}

static const struct file_operations sc_prefetch_fops = {
	.open = simple_open,
	.llseek = default_llseek,
	.read = sc_prefetch_read,
	.write = sc_prefetch_write,
};

static int __init sc_debugfs_init(void)
{
	struct dentry *dir;

	dir = debugfs_create_dir("l2cache", mips_debugfs_dir);
	debugfs_create_file("prefetch", S_IRUGO | S_IWUSR, dir, NULL,
			    &sc_prefetch_fops);
	return 0;
}
late_initcall(sc_debugfs_init);
Commit	Line	Data
d478b088 PB	1	/*
d478b088 PB	2	* Copyright (C) 2015 Imagination Technologies
fb615d61	3	* Author: Paul Burton <paul.burton@mips.com>
d478b088 PB	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License as published by the
	7	* Free Software Foundation; either version 2 of the License, or (at your
	8	* option) any later version.
	9	*/
	10
	11	#include <asm/bcache.h>
	12	#include <asm/debug.h>
7c0f6ba6	13	#include <linux/uaccess.h>
d478b088 PB	14	#include <linux/debugfs.h>
	15	#include <linux/init.h>
	16
	17	static ssize_t sc_prefetch_read(struct file file, char __user user_buf,
	18	size_t count, loff_t *ppos)
	19	{
	20	bool enabled = bc_prefetch_is_enabled();
	21	char buf[3];
	22
	23	buf[0] = enabled ? 'Y' : 'N';
	24	buf[1] = '\n';
	25	buf[2] = 0;
	26
	27	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
	28	}
	29
	30	static ssize_t sc_prefetch_write(struct file *file,
	31	const char __user *user_buf,
	32	size_t count, loff_t *ppos)
	33	{
d478b088 PB	34	bool enabled;
	35	int err;
	36
f83e4e1e	37	err = kstrtobool_from_user(user_buf, count, &enabled);
d478b088 PB	38	if (err)
	39	return err;
	40
	41	if (enabled)
	42	bc_prefetch_enable();
	43	else
	44	bc_prefetch_disable();
	45
	46	return count;
	47	}
	48
	49	static const struct file_operations sc_prefetch_fops = {
	50	.open = simple_open,
	51	.llseek = default_llseek,
	52	.read = sc_prefetch_read,
	53	.write = sc_prefetch_write,
	54	};
	55
	56	static int __init sc_debugfs_init(void)
	57	{
864cc363	58	struct dentry *dir;
d478b088 PB	59
d478b088 PB	60	dir = debugfs_create_dir("l2cache", mips_debugfs_dir);
864cc363 GKH	61	debugfs_create_file("prefetch", S_IRUGO \| S_IWUSR, dir, NULL,
864cc363 GKH	62	&sc_prefetch_fops);
d478b088 PB	63	return 0;
	64	}
	65	late_initcall(sc_debugfs_init);