Andi Kleen | cae681f | 2009-09-16 11:50:17 +0200 | [diff] [blame] | 1 | /* Inject a hwpoison memory failure on a arbitary pfn */ |
| 2 | #include <linux/module.h> |
| 3 | #include <linux/debugfs.h> |
| 4 | #include <linux/kernel.h> |
| 5 | #include <linux/mm.h> |
Wu Fengguang | 7c116f2 | 2009-12-16 12:19:59 +0100 | [diff] [blame^] | 6 | #include "internal.h" |
Andi Kleen | cae681f | 2009-09-16 11:50:17 +0200 | [diff] [blame] | 7 | |
Wu Fengguang | 847ce40 | 2009-12-16 12:19:58 +0100 | [diff] [blame] | 8 | static struct dentry *hwpoison_dir; |
Andi Kleen | cae681f | 2009-09-16 11:50:17 +0200 | [diff] [blame] | 9 | |
| 10 | static int hwpoison_inject(void *data, u64 val) |
| 11 | { |
| 12 | if (!capable(CAP_SYS_ADMIN)) |
| 13 | return -EPERM; |
| 14 | printk(KERN_INFO "Injecting memory failure at pfn %Lx\n", val); |
| 15 | return __memory_failure(val, 18, 0); |
| 16 | } |
| 17 | |
Wu Fengguang | 847ce40 | 2009-12-16 12:19:58 +0100 | [diff] [blame] | 18 | static int hwpoison_unpoison(void *data, u64 val) |
| 19 | { |
| 20 | if (!capable(CAP_SYS_ADMIN)) |
| 21 | return -EPERM; |
| 22 | |
| 23 | return unpoison_memory(val); |
| 24 | } |
| 25 | |
Andi Kleen | cae681f | 2009-09-16 11:50:17 +0200 | [diff] [blame] | 26 | DEFINE_SIMPLE_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n"); |
Wu Fengguang | 847ce40 | 2009-12-16 12:19:58 +0100 | [diff] [blame] | 27 | DEFINE_SIMPLE_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n"); |
Andi Kleen | cae681f | 2009-09-16 11:50:17 +0200 | [diff] [blame] | 28 | |
| 29 | static void pfn_inject_exit(void) |
| 30 | { |
| 31 | if (hwpoison_dir) |
| 32 | debugfs_remove_recursive(hwpoison_dir); |
| 33 | } |
| 34 | |
| 35 | static int pfn_inject_init(void) |
| 36 | { |
Wu Fengguang | 847ce40 | 2009-12-16 12:19:58 +0100 | [diff] [blame] | 37 | struct dentry *dentry; |
| 38 | |
Andi Kleen | cae681f | 2009-09-16 11:50:17 +0200 | [diff] [blame] | 39 | hwpoison_dir = debugfs_create_dir("hwpoison", NULL); |
| 40 | if (hwpoison_dir == NULL) |
| 41 | return -ENOMEM; |
Wu Fengguang | 847ce40 | 2009-12-16 12:19:58 +0100 | [diff] [blame] | 42 | |
| 43 | /* |
| 44 | * Note that the below poison/unpoison interfaces do not involve |
| 45 | * hardware status change, hence do not require hardware support. |
| 46 | * They are mainly for testing hwpoison in software level. |
| 47 | */ |
| 48 | dentry = debugfs_create_file("corrupt-pfn", 0600, hwpoison_dir, |
Andi Kleen | cae681f | 2009-09-16 11:50:17 +0200 | [diff] [blame] | 49 | NULL, &hwpoison_fops); |
Wu Fengguang | 847ce40 | 2009-12-16 12:19:58 +0100 | [diff] [blame] | 50 | if (!dentry) |
| 51 | goto fail; |
| 52 | |
| 53 | dentry = debugfs_create_file("unpoison-pfn", 0600, hwpoison_dir, |
| 54 | NULL, &unpoison_fops); |
| 55 | if (!dentry) |
| 56 | goto fail; |
| 57 | |
Wu Fengguang | 7c116f2 | 2009-12-16 12:19:59 +0100 | [diff] [blame^] | 58 | dentry = debugfs_create_u32("corrupt-filter-dev-major", 0600, |
| 59 | hwpoison_dir, &hwpoison_filter_dev_major); |
| 60 | if (!dentry) |
| 61 | goto fail; |
| 62 | |
| 63 | dentry = debugfs_create_u32("corrupt-filter-dev-minor", 0600, |
| 64 | hwpoison_dir, &hwpoison_filter_dev_minor); |
| 65 | if (!dentry) |
| 66 | goto fail; |
| 67 | |
Andi Kleen | cae681f | 2009-09-16 11:50:17 +0200 | [diff] [blame] | 68 | return 0; |
Wu Fengguang | 847ce40 | 2009-12-16 12:19:58 +0100 | [diff] [blame] | 69 | fail: |
| 70 | pfn_inject_exit(); |
| 71 | return -ENOMEM; |
Andi Kleen | cae681f | 2009-09-16 11:50:17 +0200 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | module_init(pfn_inject_init); |
| 75 | module_exit(pfn_inject_exit); |
| 76 | MODULE_LICENSE("GPL"); |