1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C) 2015 Imagination Technologies |
4 | * Author: Paul Burton <paul.burton@mips.com> |
5 | */ |
6 | |
7 | #include <asm/bcache.h> |
8 | #include <asm/debug.h> |
9 | #include <linux/uaccess.h> |
10 | #include <linux/debugfs.h> |
11 | #include <linux/init.h> |
12 | |
13 | static ssize_t sc_prefetch_read(struct file *file, char __user *user_buf, |
14 | size_t count, loff_t *ppos) |
15 | { |
16 | bool enabled = bc_prefetch_is_enabled(); |
17 | char buf[3]; |
18 | |
19 | buf[0] = enabled ? 'Y' : 'N'; |
20 | buf[1] = '\n'; |
21 | buf[2] = 0; |
22 | |
23 | return simple_read_from_buffer(to: user_buf, count, ppos, from: buf, available: 2); |
24 | } |
25 | |
26 | static ssize_t sc_prefetch_write(struct file *file, |
27 | const char __user *user_buf, |
28 | size_t count, loff_t *ppos) |
29 | { |
30 | bool enabled; |
31 | int err; |
32 | |
33 | err = kstrtobool_from_user(s: user_buf, count, res: &enabled); |
34 | if (err) |
35 | return err; |
36 | |
37 | if (enabled) |
38 | bc_prefetch_enable(); |
39 | else |
40 | bc_prefetch_disable(); |
41 | |
42 | return count; |
43 | } |
44 | |
45 | static const struct file_operations sc_prefetch_fops = { |
46 | .open = simple_open, |
47 | .llseek = default_llseek, |
48 | .read = sc_prefetch_read, |
49 | .write = sc_prefetch_write, |
50 | }; |
51 | |
52 | static int __init sc_debugfs_init(void) |
53 | { |
54 | struct dentry *dir; |
55 | |
56 | dir = debugfs_create_dir(name: "l2cache" , parent: mips_debugfs_dir); |
57 | debugfs_create_file(name: "prefetch" , S_IRUGO | S_IWUSR, parent: dir, NULL, |
58 | fops: &sc_prefetch_fops); |
59 | return 0; |
60 | } |
61 | late_initcall(sc_debugfs_init); |
62 | |