Commit cae681fc authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
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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: default avatarAndi Kleen <ak@linux.intel.com>
parent 9893e49d
......@@ -243,6 +243,10 @@ config MEMORY_FAILURE
even when some of its memory has uncorrected errors. This requires
special hardware support and typically ECC memory.
config HWPOISON_INJECT
tristate "Poison pages injector"
depends on MEMORY_FAILURE && DEBUG_KERNEL
config NOMMU_INITIAL_TRIM_EXCESS
int "Turn on mmap() excess space trimming before booting"
depends on !MMU
......
......@@ -41,5 +41,6 @@ endif
obj-$(CONFIG_QUICKLIST) += quicklist.o
obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o
obj-$(CONFIG_MEMORY_FAILURE) += memory-failure.o
obj-$(CONFIG_HWPOISON_INJECT) += hwpoison-inject.o
obj-$(CONFIG_DEBUG_KMEMLEAK) += kmemleak.o
obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak-test.o
/* 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");
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