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>
7 static struct dentry *hwpoison_dir;
9 static int hwpoison_inject(void *data, u64 val)
11 if (!capable(CAP_SYS_ADMIN))
13 printk(KERN_INFO "Injecting memory failure at pfn %Lx\n", val);
14 return __memory_failure(val, 18, 0);
17 static int hwpoison_unpoison(void *data, u64 val)
19 if (!capable(CAP_SYS_ADMIN))
22 return unpoison_memory(val);
25 DEFINE_SIMPLE_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
26 DEFINE_SIMPLE_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n");
28 static void pfn_inject_exit(void)
31 debugfs_remove_recursive(hwpoison_dir);
34 static int pfn_inject_init(void)
36 struct dentry *dentry;
38 hwpoison_dir = debugfs_create_dir("hwpoison", NULL);
39 if (hwpoison_dir == NULL)
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.
47 dentry = debugfs_create_file("corrupt-pfn", 0600, hwpoison_dir,
48 NULL, &hwpoison_fops);
52 dentry = debugfs_create_file("unpoison-pfn", 0600, hwpoison_dir,
53 NULL, &unpoison_fops);
63 module_init(pfn_inject_init);
64 module_exit(pfn_inject_exit);
65 MODULE_LICENSE("GPL");