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Commit | Line | Data |
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9cdeb404 | 1 | /* |
fd19fcd6 BP |
2 | * A simple MCE injection facility for testing different aspects of the RAS |
3 | * code. This driver should be built as module so that it can be loaded | |
4 | * on production kernels for testing purposes. | |
9cdeb404 BP |
5 | * |
6 | * This file may be distributed under the terms of the GNU General Public | |
7 | * License version 2. | |
8 | * | |
fd19fcd6 | 9 | * Copyright (c) 2010-14: Borislav Petkov <bp@alien8.de> |
9cdeb404 BP |
10 | * Advanced Micro Devices Inc. |
11 | */ | |
12 | ||
13 | #include <linux/kobject.h> | |
fd19fcd6 | 14 | #include <linux/debugfs.h> |
51990e82 | 15 | #include <linux/device.h> |
80a2e2e3 | 16 | #include <linux/module.h> |
9cdeb404 BP |
17 | #include <asm/mce.h> |
18 | ||
47ca08a4 | 19 | #include "mce_amd.h" |
9cdeb404 | 20 | |
9cdeb404 BP |
21 | /* |
22 | * Collect all the MCi_XXX settings | |
23 | */ | |
24 | static struct mce i_mce; | |
fd19fcd6 | 25 | static struct dentry *dfs_inj; |
9cdeb404 | 26 | |
fd19fcd6 BP |
27 | #define MCE_INJECT_SET(reg) \ |
28 | static int inj_##reg##_set(void *data, u64 val) \ | |
9cdeb404 | 29 | { \ |
fd19fcd6 | 30 | struct mce *m = (struct mce *)data; \ |
9cdeb404 | 31 | \ |
fd19fcd6 BP |
32 | m->reg = val; \ |
33 | return 0; \ | |
9cdeb404 BP |
34 | } |
35 | ||
fd19fcd6 BP |
36 | MCE_INJECT_SET(status); |
37 | MCE_INJECT_SET(misc); | |
38 | MCE_INJECT_SET(addr); | |
9cdeb404 | 39 | |
fd19fcd6 BP |
40 | #define MCE_INJECT_GET(reg) \ |
41 | static int inj_##reg##_get(void *data, u64 *val) \ | |
9cdeb404 | 42 | { \ |
fd19fcd6 BP |
43 | struct mce *m = (struct mce *)data; \ |
44 | \ | |
45 | *val = m->reg; \ | |
46 | return 0; \ | |
9cdeb404 BP |
47 | } |
48 | ||
fd19fcd6 BP |
49 | MCE_INJECT_GET(status); |
50 | MCE_INJECT_GET(misc); | |
51 | MCE_INJECT_GET(addr); | |
9cdeb404 | 52 | |
fd19fcd6 BP |
53 | DEFINE_SIMPLE_ATTRIBUTE(status_fops, inj_status_get, inj_status_set, "%llx\n"); |
54 | DEFINE_SIMPLE_ATTRIBUTE(misc_fops, inj_misc_get, inj_misc_set, "%llx\n"); | |
55 | DEFINE_SIMPLE_ATTRIBUTE(addr_fops, inj_addr_get, inj_addr_set, "%llx\n"); | |
9cdeb404 | 56 | |
21690934 BP |
57 | /* |
58 | * Caller needs to be make sure this cpu doesn't disappear | |
59 | * from under us, i.e.: get_cpu/put_cpu. | |
60 | */ | |
61 | static int toggle_hw_mce_inject(unsigned int cpu, bool enable) | |
62 | { | |
63 | u32 l, h; | |
64 | int err; | |
65 | ||
66 | err = rdmsr_on_cpu(cpu, MSR_K7_HWCR, &l, &h); | |
67 | if (err) { | |
68 | pr_err("%s: error reading HWCR\n", __func__); | |
69 | return err; | |
70 | } | |
71 | ||
72 | enable ? (l |= BIT(18)) : (l &= ~BIT(18)); | |
73 | ||
74 | err = wrmsr_on_cpu(cpu, MSR_K7_HWCR, l, h); | |
75 | if (err) | |
76 | pr_err("%s: error writing HWCR\n", __func__); | |
77 | ||
78 | return err; | |
79 | } | |
80 | ||
9cdeb404 BP |
81 | /* |
82 | * This denotes into which bank we're injecting and triggers | |
83 | * the injection, at the same time. | |
84 | */ | |
fd19fcd6 | 85 | static int inj_bank_set(void *data, u64 val) |
9cdeb404 | 86 | { |
fd19fcd6 | 87 | struct mce *m = (struct mce *)data; |
9cdeb404 | 88 | |
fd19fcd6 BP |
89 | if (val > 5) { |
90 | if (boot_cpu_data.x86 != 0x15 || val > 6) { | |
91 | pr_err("Non-existent MCE bank: %llu\n", val); | |
1b07ca47 BP |
92 | return -EINVAL; |
93 | } | |
fd19fcd6 | 94 | } |
9cdeb404 | 95 | |
fd19fcd6 | 96 | m->bank = val; |
9cdeb404 | 97 | |
fd19fcd6 | 98 | amd_decode_mce(NULL, 0, m); |
9cdeb404 | 99 | |
fd19fcd6 | 100 | return 0; |
9cdeb404 BP |
101 | } |
102 | ||
fd19fcd6 | 103 | static int inj_bank_get(void *data, u64 *val) |
9cdeb404 | 104 | { |
fd19fcd6 | 105 | struct mce *m = (struct mce *)data; |
9cdeb404 | 106 | |
fd19fcd6 BP |
107 | *val = m->bank; |
108 | return 0; | |
109 | } | |
9cdeb404 | 110 | |
fd19fcd6 BP |
111 | DEFINE_SIMPLE_ATTRIBUTE(bank_fops, inj_bank_get, inj_bank_set, "%llu\n"); |
112 | ||
113 | struct dfs_node { | |
114 | char *name; | |
115 | struct dentry *d; | |
116 | const struct file_operations *fops; | |
117 | } dfs_fls[] = { | |
118 | { .name = "status", .fops = &status_fops }, | |
119 | { .name = "misc", .fops = &misc_fops }, | |
120 | { .name = "addr", .fops = &addr_fops }, | |
121 | { .name = "bank", .fops = &bank_fops }, | |
9cdeb404 BP |
122 | }; |
123 | ||
fd19fcd6 | 124 | static int __init init_mce_inject(void) |
9cdeb404 | 125 | { |
fd19fcd6 | 126 | int i; |
9cdeb404 | 127 | |
fd19fcd6 BP |
128 | dfs_inj = debugfs_create_dir("mce-inject", NULL); |
129 | if (!dfs_inj) | |
9cdeb404 BP |
130 | return -EINVAL; |
131 | ||
fd19fcd6 BP |
132 | for (i = 0; i < ARRAY_SIZE(dfs_fls); i++) { |
133 | dfs_fls[i].d = debugfs_create_file(dfs_fls[i].name, | |
134 | S_IRUSR | S_IWUSR, | |
135 | dfs_inj, | |
136 | &i_mce, | |
137 | dfs_fls[i].fops); | |
9cdeb404 | 138 | |
fd19fcd6 BP |
139 | if (!dfs_fls[i].d) |
140 | goto err_dfs_add; | |
9cdeb404 | 141 | } |
fd19fcd6 | 142 | |
9cdeb404 BP |
143 | return 0; |
144 | ||
fd19fcd6 | 145 | err_dfs_add: |
df4b2a30 | 146 | while (--i >= 0) |
fd19fcd6 | 147 | debugfs_remove(dfs_fls[i].d); |
9cdeb404 | 148 | |
fd19fcd6 BP |
149 | debugfs_remove(dfs_inj); |
150 | dfs_inj = NULL; | |
9cdeb404 | 151 | |
fd19fcd6 | 152 | return -ENOMEM; |
9cdeb404 BP |
153 | } |
154 | ||
fd19fcd6 | 155 | static void __exit exit_mce_inject(void) |
9cdeb404 BP |
156 | { |
157 | int i; | |
158 | ||
fd19fcd6 BP |
159 | for (i = 0; i < ARRAY_SIZE(dfs_fls); i++) |
160 | debugfs_remove(dfs_fls[i].d); | |
9cdeb404 | 161 | |
fd19fcd6 | 162 | memset(&dfs_fls, 0, sizeof(dfs_fls)); |
9cdeb404 | 163 | |
fd19fcd6 BP |
164 | debugfs_remove(dfs_inj); |
165 | dfs_inj = NULL; | |
9cdeb404 | 166 | } |
fd19fcd6 BP |
167 | module_init(init_mce_inject); |
168 | module_exit(exit_mce_inject); | |
9cdeb404 BP |
169 | |
170 | MODULE_LICENSE("GPL"); | |
43aff26c | 171 | MODULE_AUTHOR("Borislav Petkov <bp@alien8.de>"); |
9cdeb404 | 172 | MODULE_AUTHOR("AMD Inc."); |
fd19fcd6 | 173 | MODULE_DESCRIPTION("MCE injection facility for RAS testing"); |