Commit | Line | Data |
---|---|---|
cae681fc AK |
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 | ||
847ce401 | 7 | static struct dentry *hwpoison_dir; |
cae681fc AK |
8 | |
9 | static int hwpoison_inject(void *data, u64 val) | |
10 | { | |
11 | if (!capable(CAP_SYS_ADMIN)) | |
12 | return -EPERM; | |
13 | printk(KERN_INFO "Injecting memory failure at pfn %Lx\n", val); | |
14 | return __memory_failure(val, 18, 0); | |
15 | } | |
16 | ||
847ce401 WF |
17 | static int hwpoison_unpoison(void *data, u64 val) |
18 | { | |
19 | if (!capable(CAP_SYS_ADMIN)) | |
20 | return -EPERM; | |
21 | ||
22 | return unpoison_memory(val); | |
23 | } | |
24 | ||
cae681fc | 25 | DEFINE_SIMPLE_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n"); |
847ce401 | 26 | DEFINE_SIMPLE_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n"); |
cae681fc AK |
27 | |
28 | static void pfn_inject_exit(void) | |
29 | { | |
30 | if (hwpoison_dir) | |
31 | debugfs_remove_recursive(hwpoison_dir); | |
32 | } | |
33 | ||
34 | static int pfn_inject_init(void) | |
35 | { | |
847ce401 WF |
36 | struct dentry *dentry; |
37 | ||
cae681fc AK |
38 | hwpoison_dir = debugfs_create_dir("hwpoison", NULL); |
39 | if (hwpoison_dir == NULL) | |
40 | return -ENOMEM; | |
847ce401 WF |
41 | |
42 | /* | |
43 | * Note that the below poison/unpoison interfaces do not involve | |
44 | * hardware status change, hence do not require hardware support. | |
45 | * They are mainly for testing hwpoison in software level. | |
46 | */ | |
47 | dentry = debugfs_create_file("corrupt-pfn", 0600, hwpoison_dir, | |
cae681fc | 48 | NULL, &hwpoison_fops); |
847ce401 WF |
49 | if (!dentry) |
50 | goto fail; | |
51 | ||
52 | dentry = debugfs_create_file("unpoison-pfn", 0600, hwpoison_dir, | |
53 | NULL, &unpoison_fops); | |
54 | if (!dentry) | |
55 | goto fail; | |
56 | ||
cae681fc | 57 | return 0; |
847ce401 WF |
58 | fail: |
59 | pfn_inject_exit(); | |
60 | return -ENOMEM; | |
cae681fc AK |
61 | } |
62 | ||
63 | module_init(pfn_inject_init); | |
64 | module_exit(pfn_inject_exit); | |
65 | MODULE_LICENSE("GPL"); |