Release 4.11 mm/hwpoison-inject.c

/* 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);
	/*
         * This implies unable to support free buddy pages.
         */
	if (!get_hwpoison_page(p))
		return 0;

	if (!hwpoison_filter_enable)
		goto inject;

	if (!PageLRU(hpage) && !PageHuge(p))
		shake_page(hpage, 0);
	/*
         * This implies unable to support non-LRU pages.
         */
	if (!PageLRU(hpage) && !PageHuge(p))
		goto put_out;

	/*
         * do a racy check with elevated page count, 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)
		goto put_out;

inject:
	pr_info("Injecting memory failure at pfn %#lx\n", pfn);
	return memory_failure(pfn, 18, MF_COUNT_INCREASED);
put_out:
	put_hwpoison_page(p);
	return 0;
}

Contributors
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Fengguang Wu
75
43.35%
1
7.69%
Naoya Horiguchi
45
26.01%
4
30.77%
Andi Kleen
40
23.12%
3
23.08%
Wanpeng Li
11
6.36%
3
23.08%
Vladimir Davydov
1
0.58%
1
7.69%
Tony Luck
1
0.58%
1
7.69%
Total
173
100.00%
13
100.00%



static int hwpoison_unpoison(void *data, u64 val)
{
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	return unpoison_memory(val);
}

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1
100.00%

DEFINE_SIMPLE_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
DEFINE_SIMPLE_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n");



static void pfn_inject_exit(void)
{
	debugfs_remove_recursive(hwpoison_dir);
}

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1
100.00%



static int pfn_inject_init(void)
{
	struct dentry *dentry;

	hwpoison_dir = debugfs_create_dir("hwpoison", NULL);
	if (hwpoison_dir == NULL)
		return -ENOMEM;

	/*
         * 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.
         */
	dentry = debugfs_create_file("corrupt-pfn", 0200, hwpoison_dir,
					  NULL, &hwpoison_fops);
	if (!dentry)
		goto fail;

	dentry = debugfs_create_file("unpoison-pfn", 0200, hwpoison_dir,
				     NULL, &unpoison_fops);
	if (!dentry)
		goto fail;

	dentry = debugfs_create_u32("corrupt-filter-enable", 0600,
				    hwpoison_dir, &hwpoison_filter_enable);
	if (!dentry)
		goto fail;

	dentry = debugfs_create_u32("corrupt-filter-dev-major", 0600,
				    hwpoison_dir, &hwpoison_filter_dev_major);
	if (!dentry)
		goto fail;

	dentry = debugfs_create_u32("corrupt-filter-dev-minor", 0600,
				    hwpoison_dir, &hwpoison_filter_dev_minor);
	if (!dentry)
		goto fail;

	dentry = debugfs_create_u64("corrupt-filter-flags-mask", 0600,
				    hwpoison_dir, &hwpoison_filter_flags_mask);
	if (!dentry)
		goto fail;

	dentry = debugfs_create_u64("corrupt-filter-flags-value", 0600,
				    hwpoison_dir, &hwpoison_filter_flags_value);
	if (!dentry)
		goto fail;

#ifdef CONFIG_MEMCG
	dentry = debugfs_create_u64("corrupt-filter-memcg", 0600,
				    hwpoison_dir, &hwpoison_filter_memcg);
	if (!dentry)
		goto fail;
#endif

	return 0;
fail:
	pfn_inject_exit();
	return -ENOMEM;
}

Contributors
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Fengguang Wu
127
55.22%
3
37.50%
Andi Kleen
78
33.91%
2
25.00%
Haicheng Li
22
9.57%
1
12.50%
Wanpeng Li
2
0.87%
1
12.50%
Vladimir Davydov
1
0.43%
1
12.50%
Total
230
100.00%
8
100.00%


module_init(pfn_inject_init);

module_exit(pfn_inject_exit);
MODULE_LICENSE("GPL");
Overall Contributors
Person
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Commits
CommitProp
Fengguang Wu
253
49.13%
4
20.00%
Andi Kleen
175
33.98%
4
20.00%
Naoya Horiguchi
48
9.32%
4
20.00%
Haicheng Li
22
4.27%
1
5.00%
Wanpeng Li
13
2.52%
4
20.00%
Vladimir Davydov
2
0.39%
1
5.00%
Tony Luck
1
0.19%
1
5.00%
Lucas De Marchi
1
0.19%
1
5.00%
Total
515
100.00%
20
100.00%
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