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817f32d0 AK |
1 | /* |
2 | * MCE grading rules. | |
3 | * Copyright 2008, 2009 Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; version 2 | |
8 | * of the License. | |
9 | * | |
10 | * Author: Andi Kleen | |
11 | */ | |
12 | #include <linux/kernel.h> | |
4611a6fa HY |
13 | #include <linux/seq_file.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/debugfs.h> | |
817f32d0 AK |
16 | #include <asm/mce.h> |
17 | ||
18 | #include "mce-internal.h" | |
19 | ||
20 | /* | |
21 | * Grade an mce by severity. In general the most severe ones are processed | |
22 | * first. Since there are quite a lot of combinations test the bits in a | |
23 | * table-driven way. The rules are simply processed in order, first | |
24 | * match wins. | |
ed7290d0 AK |
25 | * |
26 | * Note this is only used for machine check exceptions, the corrected | |
27 | * errors use much simpler rules. The exceptions still check for the corrected | |
28 | * errors, but only to leave them alone for the CMCI handler (except for | |
29 | * panic situations) | |
817f32d0 AK |
30 | */ |
31 | ||
ed7290d0 AK |
32 | enum context { IN_KERNEL = 1, IN_USER = 2 }; |
33 | enum ser { SER_REQUIRED = 1, NO_SER = 2 }; | |
34 | ||
817f32d0 AK |
35 | static struct severity { |
36 | u64 mask; | |
37 | u64 result; | |
38 | unsigned char sev; | |
39 | unsigned char mcgmask; | |
40 | unsigned char mcgres; | |
ed7290d0 AK |
41 | unsigned char ser; |
42 | unsigned char context; | |
4611a6fa | 43 | unsigned char covered; |
817f32d0 AK |
44 | char *msg; |
45 | } severities[] = { | |
a17957cd HS |
46 | #define MCESEV(s, m, c...) { .sev = MCE_ ## s ## _SEVERITY, .msg = m, ## c } |
47 | #define KERNEL .context = IN_KERNEL | |
48 | #define USER .context = IN_USER | |
49 | #define SER .ser = SER_REQUIRED | |
50 | #define NOSER .ser = NO_SER | |
51 | #define BITCLR(x) .mask = x, .result = 0 | |
52 | #define BITSET(x) .mask = x, .result = x | |
53 | #define MCGMASK(x, y) .mcgmask = x, .mcgres = y | |
54 | #define MASK(x, y) .mask = x, .result = y | |
ed7290d0 AK |
55 | #define MCI_UC_S (MCI_STATUS_UC|MCI_STATUS_S) |
56 | #define MCI_UC_SAR (MCI_STATUS_UC|MCI_STATUS_S|MCI_STATUS_AR) | |
5f7b88d5 | 57 | #define MCI_ADDR (MCI_STATUS_ADDRV|MCI_STATUS_MISCV) |
ed7290d0 | 58 | |
a17957cd HS |
59 | MCESEV( |
60 | NO, "Invalid", | |
61 | BITCLR(MCI_STATUS_VAL) | |
901d7691 | 62 | ), |
a17957cd HS |
63 | MCESEV( |
64 | NO, "Not enabled", | |
65 | BITCLR(MCI_STATUS_EN) | |
901d7691 | 66 | ), |
a17957cd HS |
67 | MCESEV( |
68 | PANIC, "Processor context corrupt", | |
69 | BITSET(MCI_STATUS_PCC) | |
901d7691 | 70 | ), |
ed7290d0 | 71 | /* When MCIP is not set something is very confused */ |
a17957cd HS |
72 | MCESEV( |
73 | PANIC, "MCIP not set in MCA handler", | |
74 | MCGMASK(MCG_STATUS_MCIP, 0) | |
901d7691 | 75 | ), |
ed7290d0 | 76 | /* Neither return not error IP -- no chance to recover -> PANIC */ |
a17957cd HS |
77 | MCESEV( |
78 | PANIC, "Neither restart nor error IP", | |
79 | MCGMASK(MCG_STATUS_RIPV|MCG_STATUS_EIPV, 0) | |
901d7691 | 80 | ), |
a17957cd | 81 | MCESEV( |
901d7691 | 82 | PANIC, "In kernel and no restart IP", |
a17957cd | 83 | KERNEL, MCGMASK(MCG_STATUS_RIPV, 0) |
901d7691 | 84 | ), |
a17957cd | 85 | MCESEV( |
901d7691 | 86 | KEEP, "Corrected error", |
a17957cd | 87 | NOSER, BITCLR(MCI_STATUS_UC) |
901d7691 | 88 | ), |
ed7290d0 AK |
89 | |
90 | /* ignore OVER for UCNA */ | |
a17957cd | 91 | MCESEV( |
901d7691 | 92 | KEEP, "Uncorrected no action required", |
a17957cd | 93 | SER, MASK(MCI_UC_SAR, MCI_STATUS_UC) |
901d7691 | 94 | ), |
a17957cd | 95 | MCESEV( |
901d7691 | 96 | PANIC, "Illegal combination (UCNA with AR=1)", |
a17957cd HS |
97 | SER, |
98 | MASK(MCI_STATUS_OVER|MCI_UC_SAR, MCI_STATUS_UC|MCI_STATUS_AR) | |
901d7691 | 99 | ), |
a17957cd | 100 | MCESEV( |
901d7691 | 101 | KEEP, "Non signalled machine check", |
7639bfc7 | 102 | SER, BITCLR(MCI_STATUS_S) |
901d7691 | 103 | ), |
ed7290d0 | 104 | |
a17957cd | 105 | MCESEV( |
901d7691 | 106 | PANIC, "Action required with lost events", |
7639bfc7 | 107 | SER, BITSET(MCI_STATUS_OVER|MCI_UC_SAR) |
901d7691 | 108 | ), |
5f7b88d5 TL |
109 | |
110 | /* known AR MCACODs: */ | |
111 | #ifdef CONFIG_MEMORY_FAILURE | |
112 | MCESEV( | |
113 | KEEP, "HT thread notices Action required: data load error", | |
08dda402 | 114 | SER, MASK(MCI_STATUS_OVER|MCI_UC_SAR|MCI_ADDR|MCACOD, MCI_UC_SAR|MCI_ADDR|MCACOD_DATA), |
5f7b88d5 TL |
115 | MCGMASK(MCG_STATUS_EIPV, 0) |
116 | ), | |
117 | MCESEV( | |
118 | AR, "Action required: data load error", | |
08dda402 | 119 | SER, MASK(MCI_STATUS_OVER|MCI_UC_SAR|MCI_ADDR|MCACOD, MCI_UC_SAR|MCI_ADDR|MCACOD_DATA), |
5f7b88d5 TL |
120 | USER |
121 | ), | |
37c3459b TL |
122 | MCESEV( |
123 | KEEP, "HT thread notices Action required: instruction fetch error", | |
124 | SER, MASK(MCI_STATUS_OVER|MCI_UC_SAR|MCI_ADDR|MCACOD, MCI_UC_SAR|MCI_ADDR|MCACOD_INSTR), | |
125 | MCGMASK(MCG_STATUS_EIPV, 0) | |
126 | ), | |
127 | MCESEV( | |
128 | AR, "Action required: instruction fetch error", | |
129 | SER, MASK(MCI_STATUS_OVER|MCI_UC_SAR|MCI_ADDR|MCACOD, MCI_UC_SAR|MCI_ADDR|MCACOD_INSTR), | |
130 | USER | |
131 | ), | |
5f7b88d5 | 132 | #endif |
a17957cd | 133 | MCESEV( |
7639bfc7 | 134 | PANIC, "Action required: unknown MCACOD", |
a17957cd | 135 | SER, MASK(MCI_STATUS_OVER|MCI_UC_SAR, MCI_UC_SAR) |
901d7691 | 136 | ), |
ed7290d0 AK |
137 | |
138 | /* known AO MCACODs: */ | |
a17957cd | 139 | MCESEV( |
901d7691 | 140 | AO, "Action optional: memory scrubbing error", |
08dda402 | 141 | SER, MASK(MCI_STATUS_OVER|MCI_UC_SAR|MCACOD_SCRUBMSK, MCI_UC_S|MCACOD_SCRUB) |
901d7691 | 142 | ), |
a17957cd | 143 | MCESEV( |
901d7691 | 144 | AO, "Action optional: last level cache writeback error", |
08dda402 | 145 | SER, MASK(MCI_STATUS_OVER|MCI_UC_SAR|MCACOD, MCI_UC_S|MCACOD_L3WB) |
901d7691 | 146 | ), |
a17957cd | 147 | MCESEV( |
7639bfc7 | 148 | SOME, "Action optional: unknown MCACOD", |
a17957cd | 149 | SER, MASK(MCI_STATUS_OVER|MCI_UC_SAR, MCI_UC_S) |
901d7691 | 150 | ), |
a17957cd | 151 | MCESEV( |
901d7691 | 152 | SOME, "Action optional with lost events", |
7639bfc7 | 153 | SER, MASK(MCI_STATUS_OVER|MCI_UC_SAR, MCI_STATUS_OVER|MCI_UC_S) |
901d7691 | 154 | ), |
a17957cd HS |
155 | |
156 | MCESEV( | |
157 | PANIC, "Overflowed uncorrected", | |
7639bfc7 | 158 | BITSET(MCI_STATUS_OVER|MCI_STATUS_UC) |
901d7691 | 159 | ), |
a17957cd HS |
160 | MCESEV( |
161 | UC, "Uncorrected", | |
162 | BITSET(MCI_STATUS_UC) | |
901d7691 | 163 | ), |
a17957cd HS |
164 | MCESEV( |
165 | SOME, "No match", | |
166 | BITSET(0) | |
901d7691 | 167 | ) /* always matches. keep at end */ |
817f32d0 AK |
168 | }; |
169 | ||
ed7290d0 | 170 | /* |
875e2664 TL |
171 | * If mcgstatus indicated that ip/cs on the stack were |
172 | * no good, then "m->cs" will be zero and we will have | |
173 | * to assume the worst case (IN_KERNEL) as we actually | |
174 | * have no idea what we were executing when the machine | |
175 | * check hit. | |
176 | * If we do have a good "m->cs" (or a faked one in the | |
177 | * case we were executing in VM86 mode) we can use it to | |
178 | * distinguish an exception taken in user from from one | |
179 | * taken in the kernel. | |
ed7290d0 AK |
180 | */ |
181 | static int error_context(struct mce *m) | |
182 | { | |
875e2664 | 183 | return ((m->cs & 3) == 3) ? IN_USER : IN_KERNEL; |
ed7290d0 AK |
184 | } |
185 | ||
7639bfc7 | 186 | int mce_severity(struct mce *m, int tolerant, char **msg) |
817f32d0 | 187 | { |
7639bfc7 | 188 | enum context ctx = error_context(m); |
817f32d0 | 189 | struct severity *s; |
ed7290d0 | 190 | |
817f32d0 | 191 | for (s = severities;; s++) { |
7639bfc7 | 192 | if ((m->status & s->mask) != s->result) |
817f32d0 | 193 | continue; |
7639bfc7 | 194 | if ((m->mcgstatus & s->mcgmask) != s->mcgres) |
817f32d0 | 195 | continue; |
1462594b | 196 | if (s->ser == SER_REQUIRED && !mca_cfg.ser) |
ed7290d0 | 197 | continue; |
1462594b | 198 | if (s->ser == NO_SER && mca_cfg.ser) |
ed7290d0 AK |
199 | continue; |
200 | if (s->context && ctx != s->context) | |
201 | continue; | |
817f32d0 AK |
202 | if (msg) |
203 | *msg = s->msg; | |
4611a6fa | 204 | s->covered = 1; |
ed7290d0 AK |
205 | if (s->sev >= MCE_UC_SEVERITY && ctx == IN_KERNEL) { |
206 | if (panic_on_oops || tolerant < 1) | |
207 | return MCE_PANIC_SEVERITY; | |
208 | } | |
817f32d0 AK |
209 | return s->sev; |
210 | } | |
211 | } | |
4611a6fa | 212 | |
e34e77ce | 213 | #ifdef CONFIG_DEBUG_FS |
4611a6fa HY |
214 | static void *s_start(struct seq_file *f, loff_t *pos) |
215 | { | |
216 | if (*pos >= ARRAY_SIZE(severities)) | |
217 | return NULL; | |
218 | return &severities[*pos]; | |
219 | } | |
220 | ||
221 | static void *s_next(struct seq_file *f, void *data, loff_t *pos) | |
222 | { | |
223 | if (++(*pos) >= ARRAY_SIZE(severities)) | |
224 | return NULL; | |
225 | return &severities[*pos]; | |
226 | } | |
227 | ||
228 | static void s_stop(struct seq_file *f, void *data) | |
229 | { | |
230 | } | |
231 | ||
232 | static int s_show(struct seq_file *f, void *data) | |
233 | { | |
234 | struct severity *ser = data; | |
235 | seq_printf(f, "%d\t%s\n", ser->covered, ser->msg); | |
236 | return 0; | |
237 | } | |
238 | ||
239 | static const struct seq_operations severities_seq_ops = { | |
240 | .start = s_start, | |
241 | .next = s_next, | |
242 | .stop = s_stop, | |
243 | .show = s_show, | |
244 | }; | |
245 | ||
246 | static int severities_coverage_open(struct inode *inode, struct file *file) | |
247 | { | |
248 | return seq_open(file, &severities_seq_ops); | |
249 | } | |
250 | ||
251 | static ssize_t severities_coverage_write(struct file *file, | |
252 | const char __user *ubuf, | |
253 | size_t count, loff_t *ppos) | |
254 | { | |
255 | int i; | |
256 | for (i = 0; i < ARRAY_SIZE(severities); i++) | |
257 | severities[i].covered = 0; | |
258 | return count; | |
259 | } | |
260 | ||
261 | static const struct file_operations severities_coverage_fops = { | |
262 | .open = severities_coverage_open, | |
263 | .release = seq_release, | |
264 | .read = seq_read, | |
265 | .write = severities_coverage_write, | |
6038f373 | 266 | .llseek = seq_lseek, |
4611a6fa HY |
267 | }; |
268 | ||
269 | static int __init severities_debugfs_init(void) | |
270 | { | |
7639bfc7 | 271 | struct dentry *dmce, *fsev; |
4611a6fa | 272 | |
5be9ed25 | 273 | dmce = mce_get_debugfs_dir(); |
7639bfc7 | 274 | if (!dmce) |
4611a6fa | 275 | goto err_out; |
7639bfc7 HS |
276 | |
277 | fsev = debugfs_create_file("severities-coverage", 0444, dmce, NULL, | |
278 | &severities_coverage_fops); | |
279 | if (!fsev) | |
4611a6fa HY |
280 | goto err_out; |
281 | ||
282 | return 0; | |
283 | ||
284 | err_out: | |
4611a6fa HY |
285 | return -ENOMEM; |
286 | } | |
287 | late_initcall(severities_debugfs_init); | |
7639bfc7 | 288 | #endif /* CONFIG_DEBUG_FS */ |