projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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); | |
| 33799a6d AKC |
76 | if (!file) |
| 77 | return -ENOMEM; | |
| d478b088 PB |
78 | |
| 79 | return 0; | |
| 80 | } | |
| 81 | late_initcall(sc_debugfs_init); |