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d478b088 PB |
1 | /* |
2 | * Copyright (C) 2015 Imagination Technologies | |
3 | * Author: Paul Burton <paul.burton@imgtec.com> | |
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> | |
13 | #include <asm/uaccess.h> | |
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 | { | |
34 | char buf[32]; | |
35 | ssize_t buf_size; | |
36 | bool enabled; | |
37 | int err; | |
38 | ||
39 | buf_size = min(count, sizeof(buf) - 1); | |
40 | if (copy_from_user(buf, user_buf, buf_size)) | |
41 | return -EFAULT; | |
42 | ||
43 | buf[buf_size] = '\0'; | |
44 | err = strtobool(buf, &enabled); | |
45 | if (err) | |
46 | return err; | |
47 | ||
48 | if (enabled) | |
49 | bc_prefetch_enable(); | |
50 | else | |
51 | bc_prefetch_disable(); | |
52 | ||
53 | return count; | |
54 | } | |
55 | ||
56 | static const struct file_operations sc_prefetch_fops = { | |
57 | .open = simple_open, | |
58 | .llseek = default_llseek, | |
59 | .read = sc_prefetch_read, | |
60 | .write = sc_prefetch_write, | |
61 | }; | |
62 | ||
63 | static int __init sc_debugfs_init(void) | |
64 | { | |
65 | struct dentry *dir, *file; | |
66 | ||
67 | if (!mips_debugfs_dir) | |
68 | return -ENODEV; | |
69 | ||
70 | dir = debugfs_create_dir("l2cache", mips_debugfs_dir); | |
71 | if (IS_ERR(dir)) | |
72 | return PTR_ERR(dir); | |
73 | ||
74 | file = debugfs_create_file("prefetch", S_IRUGO | S_IWUSR, dir, | |
75 | NULL, &sc_prefetch_fops); | |
76 | if (IS_ERR(file)) | |
77 | return PTR_ERR(file); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | late_initcall(sc_debugfs_init); |