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