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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
d478b088 PB |
2 | /* |
3 | * Copyright (C) 2015 Imagination Technologies | |
fb615d61 | 4 | * Author: Paul Burton <paul.burton@mips.com> |
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5 | */ |
6 | ||
7 | #include <asm/bcache.h> | |
8 | #include <asm/debug.h> | |
7c0f6ba6 | 9 | #include <linux/uaccess.h> |
d478b088 PB |
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(user_buf, count, ppos, buf, 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 | { | |
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30 | bool enabled; |
31 | int err; | |
32 | ||
f83e4e1e | 33 | err = kstrtobool_from_user(user_buf, count, &enabled); |
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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 | { | |
864cc363 | 54 | struct dentry *dir; |
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55 | |
56 | dir = debugfs_create_dir("l2cache", mips_debugfs_dir); | |
864cc363 GKH |
57 | debugfs_create_file("prefetch", S_IRUGO | S_IWUSR, dir, NULL, |
58 | &sc_prefetch_fops); | |
d478b088 PB |
59 | return 0; |
60 | } | |
61 | late_initcall(sc_debugfs_init); |