blob: d0548e382b6ba2ba6104b7cc513e9a07815263e4 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/* Inject a hwpoison memory failure on a arbitrary pfn */
#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <linux/hugetlb.h>
#include "internal.h"
static struct dentry *hwpoison_dir;
static int hwpoison_inject(void *data, u64 val)
unsigned long pfn = val;
struct page *p;
struct page *hpage;
int err;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!pfn_valid(pfn))
return -ENXIO;
p = pfn_to_page(pfn);
hpage = compound_head(p);
if (!hwpoison_filter_enable)
goto inject;
* This implies unable to support non-LRU pages except free page.
if (!PageLRU(hpage) && !PageHuge(p) && !is_free_buddy_page(p))
return 0;
* do a racy check to make sure PG_hwpoison will only be set for
* the targeted owner (or on a free page).
* memory_failure() will redo the check reliably inside page lock.
err = hwpoison_filter(hpage);
if (err)
return 0;
pr_info("Injecting memory failure at pfn %#lx\n", pfn);
err = memory_failure(pfn, MF_SW_SIMULATED);
return (err == -EOPNOTSUPP) ? 0 : err;
static int hwpoison_unpoison(void *data, u64 val)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
return unpoison_memory(val);
DEFINE_DEBUGFS_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
DEFINE_DEBUGFS_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n");
static void __exit pfn_inject_exit(void)
hwpoison_filter_enable = 0;
static int __init pfn_inject_init(void)
hwpoison_dir = debugfs_create_dir("hwpoison", NULL);
* Note that the below poison/unpoison interfaces do not involve
* hardware status change, hence do not require hardware support.
* They are mainly for testing hwpoison in software level.
debugfs_create_file("corrupt-pfn", 0200, hwpoison_dir, NULL,
debugfs_create_file("unpoison-pfn", 0200, hwpoison_dir, NULL,
debugfs_create_u32("corrupt-filter-enable", 0600, hwpoison_dir,
debugfs_create_u32("corrupt-filter-dev-major", 0600, hwpoison_dir,
debugfs_create_u32("corrupt-filter-dev-minor", 0600, hwpoison_dir,
debugfs_create_u64("corrupt-filter-flags-mask", 0600, hwpoison_dir,
debugfs_create_u64("corrupt-filter-flags-value", 0600, hwpoison_dir,
debugfs_create_u64("corrupt-filter-memcg", 0600, hwpoison_dir,
return 0;