Contributors: 19
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Andi Kleen |
190 |
46.91% |
3 |
10.71% |
| Fengguang Wu |
119 |
29.38% |
4 |
14.29% |
| Naoya Horiguchi |
21 |
5.19% |
3 |
10.71% |
| Matthew Wilcox |
14 |
3.46% |
1 |
3.57% |
| luofei |
14 |
3.46% |
1 |
3.57% |
| Miaohe Lin |
7 |
1.73% |
1 |
3.57% |
| Haicheng Li |
6 |
1.48% |
1 |
3.57% |
| Andy Whitcroft |
6 |
1.48% |
1 |
3.57% |
| zhenwei.pi |
5 |
1.23% |
2 |
7.14% |
| Jeff Johnson |
5 |
1.23% |
1 |
3.57% |
| Wanpeng Li |
4 |
0.99% |
2 |
7.14% |
| Nicholas Piggin |
3 |
0.74% |
1 |
3.57% |
| Andrew Morton |
3 |
0.74% |
1 |
3.57% |
| Xiu Jianfeng |
2 |
0.49% |
1 |
3.57% |
| zhong jiang |
2 |
0.49% |
1 |
3.57% |
| Vladimir Davydov |
1 |
0.25% |
1 |
3.57% |
| Tony Luck |
1 |
0.25% |
1 |
3.57% |
| Thomas Gleixner |
1 |
0.25% |
1 |
3.57% |
| Lucas De Marchi |
1 |
0.25% |
1 |
3.57% |
| Total |
405 |
|
28 |
|
// 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 folio *folio;
int err;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!pfn_valid(pfn))
return -ENXIO;
p = pfn_to_page(pfn);
folio = page_folio(p);
if (!hwpoison_filter_enable)
goto inject;
shake_folio(folio);
/*
* This implies unable to support non-LRU pages except free page.
*/
if (!folio_test_lru(folio) && !folio_test_hugetlb(folio) &&
!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(&folio->page);
if (err)
return 0;
inject:
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;
debugfs_remove_recursive(hwpoison_dir);
}
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,
&hwpoison_fops);
debugfs_create_file("unpoison-pfn", 0200, hwpoison_dir, NULL,
&unpoison_fops);
debugfs_create_u32("corrupt-filter-enable", 0600, hwpoison_dir,
&hwpoison_filter_enable);
debugfs_create_u32("corrupt-filter-dev-major", 0600, hwpoison_dir,
&hwpoison_filter_dev_major);
debugfs_create_u32("corrupt-filter-dev-minor", 0600, hwpoison_dir,
&hwpoison_filter_dev_minor);
debugfs_create_u64("corrupt-filter-flags-mask", 0600, hwpoison_dir,
&hwpoison_filter_flags_mask);
debugfs_create_u64("corrupt-filter-flags-value", 0600, hwpoison_dir,
&hwpoison_filter_flags_value);
#ifdef CONFIG_MEMCG
debugfs_create_u64("corrupt-filter-memcg", 0600, hwpoison_dir,
&hwpoison_filter_memcg);
#endif
return 0;
}
module_init(pfn_inject_init);
module_exit(pfn_inject_exit);
MODULE_DESCRIPTION("HWPoison pages injector");
MODULE_LICENSE("GPL");