^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* Inject a hwpoison memory failure on a arbitrary pfn */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/hugetlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) static struct dentry *hwpoison_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static int hwpoison_inject(void *data, u64 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) unsigned long pfn = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) struct page *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct page *hpage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) if (!pfn_valid(pfn))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) p = pfn_to_page(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) hpage = compound_head(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) if (!hwpoison_filter_enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) goto inject;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) shake_page(hpage, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * This implies unable to support non-LRU pages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) if (!PageLRU(hpage) && !PageHuge(p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * do a racy check to make sure PG_hwpoison will only be set for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * the targeted owner (or on a free page).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * memory_failure() will redo the check reliably inside page lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) err = hwpoison_filter(hpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) inject:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) pr_info("Injecting memory failure at pfn %#lx\n", pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return memory_failure(pfn, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static int hwpoison_unpoison(void *data, u64 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return unpoison_memory(val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) DEFINE_DEBUGFS_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) DEFINE_DEBUGFS_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static void pfn_inject_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) debugfs_remove_recursive(hwpoison_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static int pfn_inject_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) hwpoison_dir = debugfs_create_dir("hwpoison", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * Note that the below poison/unpoison interfaces do not involve
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * hardware status change, hence do not require hardware support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * They are mainly for testing hwpoison in software level.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) debugfs_create_file("corrupt-pfn", 0200, hwpoison_dir, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) &hwpoison_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) debugfs_create_file("unpoison-pfn", 0200, hwpoison_dir, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) &unpoison_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) debugfs_create_u32("corrupt-filter-enable", 0600, hwpoison_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) &hwpoison_filter_enable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) debugfs_create_u32("corrupt-filter-dev-major", 0600, hwpoison_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) &hwpoison_filter_dev_major);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) debugfs_create_u32("corrupt-filter-dev-minor", 0600, hwpoison_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) &hwpoison_filter_dev_minor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) debugfs_create_u64("corrupt-filter-flags-mask", 0600, hwpoison_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) &hwpoison_filter_flags_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) debugfs_create_u64("corrupt-filter-flags-value", 0600, hwpoison_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) &hwpoison_filter_flags_value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #ifdef CONFIG_MEMCG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) debugfs_create_u64("corrupt-filter-memcg", 0600, hwpoison_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) &hwpoison_filter_memcg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) module_init(pfn_inject_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) module_exit(pfn_inject_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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