Paul Burton | d478b08 | 2015-09-22 10:10:56 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 13 | #include <linux/uaccess.h> |
Paul Burton | d478b08 | 2015-09-22 10:10:56 -0700 | [diff] [blame] | 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); |
Amitoj Kaur Chawla | 33799a6 | 2016-07-29 13:58:46 +0530 | [diff] [blame] | 76 | if (!file) |
| 77 | return -ENOMEM; |
Paul Burton | d478b08 | 2015-09-22 10:10:56 -0700 | [diff] [blame] | 78 | |
| 79 | return 0; |
| 80 | } |
| 81 | late_initcall(sc_debugfs_init); |