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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

mm/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -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

mm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

mm/hwpoison-inject.c

0 → 100644
+41 −0
Original line number Diff line number Diff line 
/* 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");