HWPOISON: add fs/device filters
[linux-2.6.git] / mm / hwpoison-inject.c
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>
6 #include "internal.h"
7
8 static struct dentry *hwpoison_dir;
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
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
26 DEFINE_SIMPLE_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
27 DEFINE_SIMPLE_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n");
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 {
37         struct dentry *dentry;
38
39         hwpoison_dir = debugfs_create_dir("hwpoison", NULL);
40         if (hwpoison_dir == NULL)
41                 return -ENOMEM;
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,
49                                           NULL, &hwpoison_fops);
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
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
68         return 0;
69 fail:
70         pfn_inject_exit();
71         return -ENOMEM;
72 }
73
74 module_init(pfn_inject_init);
75 module_exit(pfn_inject_exit);
76 MODULE_LICENSE("GPL");