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Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
25985edc | 2 | /* Inject a hwpoison memory failure on a arbitrary pfn */ |
cae681fc AK |
3 | #include <linux/module.h> |
4 | #include <linux/debugfs.h> | |
5 | #include <linux/kernel.h> | |
6 | #include <linux/mm.h> | |
31d3d348 WF |
7 | #include <linux/swap.h> |
8 | #include <linux/pagemap.h> | |
43131e14 | 9 | #include <linux/hugetlb.h> |
7c116f2b | 10 | #include "internal.h" |
cae681fc | 11 | |
847ce401 | 12 | static struct dentry *hwpoison_dir; |
cae681fc AK |
13 | |
14 | static int hwpoison_inject(void *data, u64 val) | |
15 | { | |
31d3d348 WF |
16 | unsigned long pfn = val; |
17 | struct page *p; | |
43131e14 | 18 | struct page *hpage; |
31d3d348 WF |
19 | int err; |
20 | ||
cae681fc AK |
21 | if (!capable(CAP_SYS_ADMIN)) |
22 | return -EPERM; | |
31d3d348 WF |
23 | |
24 | if (!pfn_valid(pfn)) | |
25 | return -ENXIO; | |
26 | ||
27 | p = pfn_to_page(pfn); | |
43131e14 | 28 | hpage = compound_head(p); |
31d3d348 | 29 | |
fb31ba30 WL |
30 | if (!hwpoison_filter_enable) |
31 | goto inject; | |
32 | ||
d0505e9f | 33 | shake_page(hpage); |
31d3d348 | 34 | /* |
a581865e | 35 | * This implies unable to support non-LRU pages except free page. |
31d3d348 | 36 | */ |
a581865e | 37 | if (!PageLRU(hpage) && !PageHuge(p) && !is_free_buddy_page(p)) |
fd476720 | 38 | return 0; |
31d3d348 WF |
39 | |
40 | /* | |
fd476720 NH |
41 | * do a racy check to make sure PG_hwpoison will only be set for |
42 | * the targeted owner (or on a free page). | |
cd42f4a3 | 43 | * memory_failure() will redo the check reliably inside page lock. |
31d3d348 | 44 | */ |
43131e14 | 45 | err = hwpoison_filter(hpage); |
31d3d348 | 46 | if (err) |
fd476720 | 47 | return 0; |
31d3d348 | 48 | |
0d57eb8d | 49 | inject: |
4883e997 | 50 | pr_info("Injecting memory failure at pfn %#lx\n", pfn); |
67f22ba7 | 51 | err = memory_failure(pfn, MF_SW_SIMULATED); |
d1fe111f | 52 | return (err == -EOPNOTSUPP) ? 0 : err; |
cae681fc AK |
53 | } |
54 | ||
847ce401 WF |
55 | static int hwpoison_unpoison(void *data, u64 val) |
56 | { | |
57 | if (!capable(CAP_SYS_ADMIN)) | |
58 | return -EPERM; | |
59 | ||
60 | return unpoison_memory(val); | |
61 | } | |
62 | ||
35e3d566 | 63 | DEFINE_DEBUGFS_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n"); |
64 | DEFINE_DEBUGFS_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n"); | |
cae681fc AK |
65 | |
66 | static void pfn_inject_exit(void) | |
67 | { | |
f0696cb4 | 68 | hwpoison_filter_enable = 0; |
c2ea2181 | 69 | debugfs_remove_recursive(hwpoison_dir); |
cae681fc AK |
70 | } |
71 | ||
72 | static int pfn_inject_init(void) | |
73 | { | |
74 | hwpoison_dir = debugfs_create_dir("hwpoison", NULL); | |
847ce401 WF |
75 | |
76 | /* | |
77 | * Note that the below poison/unpoison interfaces do not involve | |
78 | * hardware status change, hence do not require hardware support. | |
79 | * They are mainly for testing hwpoison in software level. | |
80 | */ | |
2fcc6e20 GKH |
81 | debugfs_create_file("corrupt-pfn", 0200, hwpoison_dir, NULL, |
82 | &hwpoison_fops); | |
83 | ||
84 | debugfs_create_file("unpoison-pfn", 0200, hwpoison_dir, NULL, | |
85 | &unpoison_fops); | |
86 | ||
87 | debugfs_create_u32("corrupt-filter-enable", 0600, hwpoison_dir, | |
88 | &hwpoison_filter_enable); | |
89 | ||
90 | debugfs_create_u32("corrupt-filter-dev-major", 0600, hwpoison_dir, | |
91 | &hwpoison_filter_dev_major); | |
92 | ||
93 | debugfs_create_u32("corrupt-filter-dev-minor", 0600, hwpoison_dir, | |
94 | &hwpoison_filter_dev_minor); | |
95 | ||
96 | debugfs_create_u64("corrupt-filter-flags-mask", 0600, hwpoison_dir, | |
97 | &hwpoison_filter_flags_mask); | |
98 | ||
99 | debugfs_create_u64("corrupt-filter-flags-value", 0600, hwpoison_dir, | |
100 | &hwpoison_filter_flags_value); | |
478c5ffc | 101 | |
94a59fb3 | 102 | #ifdef CONFIG_MEMCG |
2fcc6e20 GKH |
103 | debugfs_create_u64("corrupt-filter-memcg", 0600, hwpoison_dir, |
104 | &hwpoison_filter_memcg); | |
4fd466eb AK |
105 | #endif |
106 | ||
cae681fc AK |
107 | return 0; |
108 | } | |
109 | ||
110 | module_init(pfn_inject_init); | |
111 | module_exit(pfn_inject_exit); | |
112 | MODULE_LICENSE("GPL"); |