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   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");