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authorAndi Kleen <andi@firstfloor.org>2009-09-16 11:50:17 +0200
committerAndi Kleen <ak@linux.intel.com>2009-09-16 11:50:17 +0200
commitcae681fc12a824631337906d6ba1dbd498e751a5 (patch)
tree121ca5ece3adc954010f32f1d502066158124887 /mm/hwpoison-inject.c
parent9893e49d64a4874ea67849ee2cfbf3f3d6817573 (diff)
downloadlinux-cae681fc12a824631337906d6ba1dbd498e751a5.tar.gz
HWPOISON: Add simple debugfs interface to inject hwpoison on arbitary PFNs
Useful for some testing scenarios, although specific testing is often done better through MADV_POISON This can be done with the x86 level MCE injector too, but this interface allows it to do independently from low level x86 changes. v2: Add module license (Haicheng Li) Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'mm/hwpoison-inject.c')
-rw-r--r--mm/hwpoison-inject.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c
new file mode 100644
index 00000000000..e1d85137f08
--- /dev/null
+++ b/mm/hwpoison-inject.c
@@ -0,0 +1,41 @@
+/* Inject a hwpoison memory failure on a arbitary pfn */
+#include <linux/module.h>
+#include <linux/debugfs.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+
+static struct dentry *hwpoison_dir, *corrupt_pfn;
+
+static int hwpoison_inject(void *data, u64 val)
+{
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ printk(KERN_INFO "Injecting memory failure at pfn %Lx\n", val);
+ return __memory_failure(val, 18, 0);
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
+
+static void pfn_inject_exit(void)
+{
+ if (hwpoison_dir)
+ debugfs_remove_recursive(hwpoison_dir);
+}
+
+static int pfn_inject_init(void)
+{
+ hwpoison_dir = debugfs_create_dir("hwpoison", NULL);
+ if (hwpoison_dir == NULL)
+ return -ENOMEM;
+ corrupt_pfn = debugfs_create_file("corrupt-pfn", 0600, hwpoison_dir,
+ NULL, &hwpoison_fops);
+ if (corrupt_pfn == NULL) {
+ pfn_inject_exit();
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+module_init(pfn_inject_init);
+module_exit(pfn_inject_exit);
+MODULE_LICENSE("GPL");