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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2015 Imagination Technologies
* Author: Paul Burton <paul.burton@mips.com>
*/
#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);
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