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
   7 static struct dentry *hwpoison_dir, *corrupt_pfn;
   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
  17 DEFINE_SIMPLE_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
  18
  19 static void pfn_inject_exit(void)
  20 {
  21         if (hwpoison_dir)
  22                 debugfs_remove_recursive(hwpoison_dir);
  23 }
  24
  25 static int pfn_inject_init(void)
  26 {
  27         hwpoison_dir = debugfs_create_dir("hwpoison", NULL);
  28         if (hwpoison_dir == NULL)
  29                 return -ENOMEM;
  30         corrupt_pfn = debugfs_create_file("corrupt-pfn", 0600, hwpoison_dir,
  31                                           NULL, &hwpoison_fops);
  32         if (corrupt_pfn == NULL) {
  33                 pfn_inject_exit();
  34                 return -ENOMEM;
  35         }
  36         return 0;
  37 }
  38
  39 module_init(pfn_inject_init);
  40 module_exit(pfn_inject_exit);
  41 MODULE_LICENSE("GPL");