Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Machine check handler. | |
e9eee03e | 3 | * |
1da177e4 | 4 | * K8 parts Copyright 2002,2003 Andi Kleen, SuSE Labs. |
d88203d1 TG |
5 | * Rest from unknown author(s). |
6 | * 2004 Andi Kleen. Rewrote most of it. | |
b79109c3 AK |
7 | * Copyright 2008 Intel Corporation |
8 | * Author: Andi Kleen | |
1da177e4 | 9 | */ |
e9eee03e IM |
10 | #include <linux/thread_info.h> |
11 | #include <linux/capability.h> | |
12 | #include <linux/miscdevice.h> | |
ccc3c319 | 13 | #include <linux/interrupt.h> |
e9eee03e IM |
14 | #include <linux/ratelimit.h> |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/rcupdate.h> | |
e9eee03e | 17 | #include <linux/kobject.h> |
14a02530 | 18 | #include <linux/uaccess.h> |
e9eee03e IM |
19 | #include <linux/kdebug.h> |
20 | #include <linux/kernel.h> | |
21 | #include <linux/percpu.h> | |
1da177e4 | 22 | #include <linux/string.h> |
1da177e4 | 23 | #include <linux/sysdev.h> |
3c079792 | 24 | #include <linux/delay.h> |
8c566ef5 | 25 | #include <linux/ctype.h> |
e9eee03e | 26 | #include <linux/sched.h> |
0d7482e3 | 27 | #include <linux/sysfs.h> |
e9eee03e IM |
28 | #include <linux/types.h> |
29 | #include <linux/init.h> | |
30 | #include <linux/kmod.h> | |
31 | #include <linux/poll.h> | |
3c079792 | 32 | #include <linux/nmi.h> |
e9eee03e | 33 | #include <linux/cpu.h> |
14a02530 | 34 | #include <linux/smp.h> |
e9eee03e | 35 | #include <linux/fs.h> |
9b1beaf2 | 36 | #include <linux/mm.h> |
5be9ed25 | 37 | #include <linux/debugfs.h> |
e9eee03e | 38 | |
d88203d1 | 39 | #include <asm/processor.h> |
ccc3c319 AK |
40 | #include <asm/hw_irq.h> |
41 | #include <asm/apic.h> | |
e02e68d3 | 42 | #include <asm/idle.h> |
ccc3c319 | 43 | #include <asm/ipi.h> |
e9eee03e IM |
44 | #include <asm/mce.h> |
45 | #include <asm/msr.h> | |
1da177e4 | 46 | |
bd19a5e6 | 47 | #include "mce-internal.h" |
711c2e48 | 48 | |
f56e8a07 PM |
49 | #define rcu_dereference_check_mce(p) \ |
50 | rcu_dereference_check((p), \ | |
51 | rcu_read_lock_sched_held() || \ | |
52 | lockdep_is_held(&mce_read_mutex)) | |
53 | ||
8968f9d3 HS |
54 | #define CREATE_TRACE_POINTS |
55 | #include <trace/events/mce.h> | |
56 | ||
4e5b3e69 | 57 | int mce_disabled __read_mostly; |
04b2b1a4 | 58 | |
e9eee03e | 59 | #define MISC_MCELOG_MINOR 227 |
0d7482e3 | 60 | |
3c079792 AK |
61 | #define SPINUNIT 100 /* 100ns */ |
62 | ||
553f265f AK |
63 | atomic_t mce_entry; |
64 | ||
01ca79f1 AK |
65 | DEFINE_PER_CPU(unsigned, mce_exception_count); |
66 | ||
bd78432c TH |
67 | /* |
68 | * Tolerant levels: | |
69 | * 0: always panic on uncorrected errors, log corrected errors | |
70 | * 1: panic or SIGBUS on uncorrected errors, log corrected errors | |
71 | * 2: SIGBUS or log uncorrected errors (if possible), log corrected errors | |
72 | * 3: never panic or SIGBUS, log all errors (for testing only) | |
73 | */ | |
4e5b3e69 HS |
74 | static int tolerant __read_mostly = 1; |
75 | static int banks __read_mostly; | |
4e5b3e69 HS |
76 | static int rip_msr __read_mostly; |
77 | static int mce_bootlog __read_mostly = -1; | |
78 | static int monarch_timeout __read_mostly = -1; | |
79 | static int mce_panic_timeout __read_mostly; | |
80 | static int mce_dont_log_ce __read_mostly; | |
81 | int mce_cmci_disabled __read_mostly; | |
82 | int mce_ignore_ce __read_mostly; | |
83 | int mce_ser __read_mostly; | |
a98f0dd3 | 84 | |
cebe1820 AK |
85 | struct mce_bank *mce_banks __read_mostly; |
86 | ||
1020bcbc HS |
87 | /* User mode helper program triggered by machine check event */ |
88 | static unsigned long mce_need_notify; | |
89 | static char mce_helper[128]; | |
90 | static char *mce_helper_argv[2] = { mce_helper, NULL }; | |
1da177e4 | 91 | |
e02e68d3 | 92 | static DECLARE_WAIT_QUEUE_HEAD(mce_wait); |
3c079792 AK |
93 | static DEFINE_PER_CPU(struct mce, mces_seen); |
94 | static int cpu_missing; | |
95 | ||
fb253195 BP |
96 | /* |
97 | * CPU/chipset specific EDAC code can register a notifier call here to print | |
98 | * MCE errors in a human-readable form. | |
99 | */ | |
100 | ATOMIC_NOTIFIER_HEAD(x86_mce_decoder_chain); | |
101 | EXPORT_SYMBOL_GPL(x86_mce_decoder_chain); | |
102 | ||
103 | static int default_decode_mce(struct notifier_block *nb, unsigned long val, | |
104 | void *data) | |
f436f8bb IM |
105 | { |
106 | pr_emerg("No human readable MCE decoding support on this CPU type.\n"); | |
107 | pr_emerg("Run the message through 'mcelog --ascii' to decode.\n"); | |
fb253195 BP |
108 | |
109 | return NOTIFY_STOP; | |
f436f8bb IM |
110 | } |
111 | ||
fb253195 BP |
112 | static struct notifier_block mce_dec_nb = { |
113 | .notifier_call = default_decode_mce, | |
114 | .priority = -1, | |
115 | }; | |
e02e68d3 | 116 | |
ee031c31 AK |
117 | /* MCA banks polled by the period polling timer for corrected events */ |
118 | DEFINE_PER_CPU(mce_banks_t, mce_poll_banks) = { | |
119 | [0 ... BITS_TO_LONGS(MAX_NR_BANKS)-1] = ~0UL | |
120 | }; | |
121 | ||
9b1beaf2 AK |
122 | static DEFINE_PER_CPU(struct work_struct, mce_work); |
123 | ||
b5f2fa4e AK |
124 | /* Do initial initialization of a struct mce */ |
125 | void mce_setup(struct mce *m) | |
126 | { | |
127 | memset(m, 0, sizeof(struct mce)); | |
d620c67f | 128 | m->cpu = m->extcpu = smp_processor_id(); |
b5f2fa4e | 129 | rdtscll(m->tsc); |
8ee08347 AK |
130 | /* We hope get_seconds stays lockless */ |
131 | m->time = get_seconds(); | |
132 | m->cpuvendor = boot_cpu_data.x86_vendor; | |
133 | m->cpuid = cpuid_eax(1); | |
134 | #ifdef CONFIG_SMP | |
135 | m->socketid = cpu_data(m->extcpu).phys_proc_id; | |
136 | #endif | |
137 | m->apicid = cpu_data(m->extcpu).initial_apicid; | |
138 | rdmsrl(MSR_IA32_MCG_CAP, m->mcgcap); | |
b5f2fa4e AK |
139 | } |
140 | ||
ea149b36 AK |
141 | DEFINE_PER_CPU(struct mce, injectm); |
142 | EXPORT_PER_CPU_SYMBOL_GPL(injectm); | |
143 | ||
1da177e4 LT |
144 | /* |
145 | * Lockless MCE logging infrastructure. | |
146 | * This avoids deadlocks on printk locks without having to break locks. Also | |
147 | * separate MCEs from kernel messages to avoid bogus bug reports. | |
148 | */ | |
149 | ||
231fd906 | 150 | static struct mce_log mcelog = { |
f6fb0ac0 AK |
151 | .signature = MCE_LOG_SIGNATURE, |
152 | .len = MCE_LOG_LEN, | |
153 | .recordlen = sizeof(struct mce), | |
d88203d1 | 154 | }; |
1da177e4 LT |
155 | |
156 | void mce_log(struct mce *mce) | |
157 | { | |
158 | unsigned next, entry; | |
e9eee03e | 159 | |
8968f9d3 HS |
160 | /* Emit the trace record: */ |
161 | trace_mce_record(mce); | |
162 | ||
1da177e4 | 163 | mce->finished = 0; |
7644143c | 164 | wmb(); |
1da177e4 | 165 | for (;;) { |
f56e8a07 | 166 | entry = rcu_dereference_check_mce(mcelog.next); |
673242c1 | 167 | for (;;) { |
e9eee03e IM |
168 | /* |
169 | * When the buffer fills up discard new entries. | |
170 | * Assume that the earlier errors are the more | |
171 | * interesting ones: | |
172 | */ | |
673242c1 | 173 | if (entry >= MCE_LOG_LEN) { |
14a02530 HS |
174 | set_bit(MCE_OVERFLOW, |
175 | (unsigned long *)&mcelog.flags); | |
673242c1 AK |
176 | return; |
177 | } | |
e9eee03e | 178 | /* Old left over entry. Skip: */ |
673242c1 AK |
179 | if (mcelog.entry[entry].finished) { |
180 | entry++; | |
181 | continue; | |
182 | } | |
7644143c | 183 | break; |
1da177e4 | 184 | } |
1da177e4 LT |
185 | smp_rmb(); |
186 | next = entry + 1; | |
187 | if (cmpxchg(&mcelog.next, entry, next) == entry) | |
188 | break; | |
189 | } | |
190 | memcpy(mcelog.entry + entry, mce, sizeof(struct mce)); | |
7644143c | 191 | wmb(); |
1da177e4 | 192 | mcelog.entry[entry].finished = 1; |
7644143c | 193 | wmb(); |
1da177e4 | 194 | |
a0189c70 | 195 | mce->finished = 1; |
1020bcbc | 196 | set_bit(0, &mce_need_notify); |
1da177e4 LT |
197 | } |
198 | ||
77e26cca | 199 | static void print_mce(struct mce *m) |
1da177e4 | 200 | { |
f436f8bb | 201 | pr_emerg("CPU %d: Machine Check Exception: %16Lx Bank %d: %016Lx\n", |
d620c67f | 202 | m->extcpu, m->mcgstatus, m->bank, m->status); |
f436f8bb | 203 | |
65ea5b03 | 204 | if (m->ip) { |
f436f8bb IM |
205 | pr_emerg("RIP%s %02x:<%016Lx> ", |
206 | !(m->mcgstatus & MCG_STATUS_EIPV) ? " !INEXACT!" : "", | |
207 | m->cs, m->ip); | |
208 | ||
1da177e4 | 209 | if (m->cs == __KERNEL_CS) |
65ea5b03 | 210 | print_symbol("{%s}", m->ip); |
f436f8bb | 211 | pr_cont("\n"); |
1da177e4 | 212 | } |
f436f8bb IM |
213 | |
214 | pr_emerg("TSC %llx ", m->tsc); | |
1da177e4 | 215 | if (m->addr) |
f436f8bb | 216 | pr_cont("ADDR %llx ", m->addr); |
1da177e4 | 217 | if (m->misc) |
f436f8bb | 218 | pr_cont("MISC %llx ", m->misc); |
549d042d | 219 | |
f436f8bb IM |
220 | pr_cont("\n"); |
221 | pr_emerg("PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x\n", | |
222 | m->cpuvendor, m->cpuid, m->time, m->socketid, m->apicid); | |
223 | ||
224 | /* | |
225 | * Print out human-readable details about the MCE error, | |
fb253195 | 226 | * (if the CPU has an implementation for that) |
f436f8bb | 227 | */ |
fb253195 | 228 | atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, m); |
86503560 AK |
229 | } |
230 | ||
77e26cca HS |
231 | static void print_mce_head(void) |
232 | { | |
f436f8bb | 233 | pr_emerg("\nHARDWARE ERROR\n"); |
77e26cca HS |
234 | } |
235 | ||
86503560 AK |
236 | static void print_mce_tail(void) |
237 | { | |
f436f8bb | 238 | pr_emerg("This is not a software problem!\n"); |
1da177e4 LT |
239 | } |
240 | ||
f94b61c2 AK |
241 | #define PANIC_TIMEOUT 5 /* 5 seconds */ |
242 | ||
243 | static atomic_t mce_paniced; | |
244 | ||
bf783f9f HY |
245 | static int fake_panic; |
246 | static atomic_t mce_fake_paniced; | |
247 | ||
f94b61c2 AK |
248 | /* Panic in progress. Enable interrupts and wait for final IPI */ |
249 | static void wait_for_panic(void) | |
250 | { | |
251 | long timeout = PANIC_TIMEOUT*USEC_PER_SEC; | |
f436f8bb | 252 | |
f94b61c2 AK |
253 | preempt_disable(); |
254 | local_irq_enable(); | |
255 | while (timeout-- > 0) | |
256 | udelay(1); | |
29b0f591 AK |
257 | if (panic_timeout == 0) |
258 | panic_timeout = mce_panic_timeout; | |
f94b61c2 AK |
259 | panic("Panicing machine check CPU died"); |
260 | } | |
261 | ||
bd19a5e6 | 262 | static void mce_panic(char *msg, struct mce *final, char *exp) |
d88203d1 | 263 | { |
1da177e4 | 264 | int i; |
e02e68d3 | 265 | |
bf783f9f HY |
266 | if (!fake_panic) { |
267 | /* | |
268 | * Make sure only one CPU runs in machine check panic | |
269 | */ | |
270 | if (atomic_inc_return(&mce_paniced) > 1) | |
271 | wait_for_panic(); | |
272 | barrier(); | |
f94b61c2 | 273 | |
bf783f9f HY |
274 | bust_spinlocks(1); |
275 | console_verbose(); | |
276 | } else { | |
277 | /* Don't log too much for fake panic */ | |
278 | if (atomic_inc_return(&mce_fake_paniced) > 1) | |
279 | return; | |
280 | } | |
77e26cca | 281 | print_mce_head(); |
a0189c70 | 282 | /* First print corrected ones that are still unlogged */ |
1da177e4 | 283 | for (i = 0; i < MCE_LOG_LEN; i++) { |
a0189c70 | 284 | struct mce *m = &mcelog.entry[i]; |
77e26cca HS |
285 | if (!(m->status & MCI_STATUS_VAL)) |
286 | continue; | |
287 | if (!(m->status & MCI_STATUS_UC)) | |
288 | print_mce(m); | |
a0189c70 AK |
289 | } |
290 | /* Now print uncorrected but with the final one last */ | |
291 | for (i = 0; i < MCE_LOG_LEN; i++) { | |
292 | struct mce *m = &mcelog.entry[i]; | |
293 | if (!(m->status & MCI_STATUS_VAL)) | |
1da177e4 | 294 | continue; |
77e26cca HS |
295 | if (!(m->status & MCI_STATUS_UC)) |
296 | continue; | |
a0189c70 | 297 | if (!final || memcmp(m, final, sizeof(struct mce))) |
77e26cca | 298 | print_mce(m); |
1da177e4 | 299 | } |
a0189c70 | 300 | if (final) |
77e26cca | 301 | print_mce(final); |
3c079792 AK |
302 | if (cpu_missing) |
303 | printk(KERN_EMERG "Some CPUs didn't answer in synchronization\n"); | |
86503560 | 304 | print_mce_tail(); |
bd19a5e6 AK |
305 | if (exp) |
306 | printk(KERN_EMERG "Machine check: %s\n", exp); | |
bf783f9f HY |
307 | if (!fake_panic) { |
308 | if (panic_timeout == 0) | |
309 | panic_timeout = mce_panic_timeout; | |
310 | panic(msg); | |
311 | } else | |
312 | printk(KERN_EMERG "Fake kernel panic: %s\n", msg); | |
d88203d1 | 313 | } |
1da177e4 | 314 | |
ea149b36 AK |
315 | /* Support code for software error injection */ |
316 | ||
317 | static int msr_to_offset(u32 msr) | |
318 | { | |
319 | unsigned bank = __get_cpu_var(injectm.bank); | |
f436f8bb | 320 | |
ea149b36 AK |
321 | if (msr == rip_msr) |
322 | return offsetof(struct mce, ip); | |
a2d32bcb | 323 | if (msr == MSR_IA32_MCx_STATUS(bank)) |
ea149b36 | 324 | return offsetof(struct mce, status); |
a2d32bcb | 325 | if (msr == MSR_IA32_MCx_ADDR(bank)) |
ea149b36 | 326 | return offsetof(struct mce, addr); |
a2d32bcb | 327 | if (msr == MSR_IA32_MCx_MISC(bank)) |
ea149b36 AK |
328 | return offsetof(struct mce, misc); |
329 | if (msr == MSR_IA32_MCG_STATUS) | |
330 | return offsetof(struct mce, mcgstatus); | |
331 | return -1; | |
332 | } | |
333 | ||
5f8c1a54 AK |
334 | /* MSR access wrappers used for error injection */ |
335 | static u64 mce_rdmsrl(u32 msr) | |
336 | { | |
337 | u64 v; | |
11868a2d | 338 | |
ea149b36 AK |
339 | if (__get_cpu_var(injectm).finished) { |
340 | int offset = msr_to_offset(msr); | |
11868a2d | 341 | |
ea149b36 AK |
342 | if (offset < 0) |
343 | return 0; | |
344 | return *(u64 *)((char *)&__get_cpu_var(injectm) + offset); | |
345 | } | |
11868a2d IM |
346 | |
347 | if (rdmsrl_safe(msr, &v)) { | |
348 | WARN_ONCE(1, "mce: Unable to read msr %d!\n", msr); | |
349 | /* | |
350 | * Return zero in case the access faulted. This should | |
351 | * not happen normally but can happen if the CPU does | |
352 | * something weird, or if the code is buggy. | |
353 | */ | |
354 | v = 0; | |
355 | } | |
356 | ||
5f8c1a54 AK |
357 | return v; |
358 | } | |
359 | ||
360 | static void mce_wrmsrl(u32 msr, u64 v) | |
361 | { | |
ea149b36 AK |
362 | if (__get_cpu_var(injectm).finished) { |
363 | int offset = msr_to_offset(msr); | |
11868a2d | 364 | |
ea149b36 AK |
365 | if (offset >= 0) |
366 | *(u64 *)((char *)&__get_cpu_var(injectm) + offset) = v; | |
367 | return; | |
368 | } | |
5f8c1a54 AK |
369 | wrmsrl(msr, v); |
370 | } | |
371 | ||
9b1beaf2 AK |
372 | /* |
373 | * Simple lockless ring to communicate PFNs from the exception handler with the | |
374 | * process context work function. This is vastly simplified because there's | |
375 | * only a single reader and a single writer. | |
376 | */ | |
377 | #define MCE_RING_SIZE 16 /* we use one entry less */ | |
378 | ||
379 | struct mce_ring { | |
380 | unsigned short start; | |
381 | unsigned short end; | |
382 | unsigned long ring[MCE_RING_SIZE]; | |
383 | }; | |
384 | static DEFINE_PER_CPU(struct mce_ring, mce_ring); | |
385 | ||
386 | /* Runs with CPU affinity in workqueue */ | |
387 | static int mce_ring_empty(void) | |
388 | { | |
389 | struct mce_ring *r = &__get_cpu_var(mce_ring); | |
390 | ||
391 | return r->start == r->end; | |
392 | } | |
393 | ||
394 | static int mce_ring_get(unsigned long *pfn) | |
395 | { | |
396 | struct mce_ring *r; | |
397 | int ret = 0; | |
398 | ||
399 | *pfn = 0; | |
400 | get_cpu(); | |
401 | r = &__get_cpu_var(mce_ring); | |
402 | if (r->start == r->end) | |
403 | goto out; | |
404 | *pfn = r->ring[r->start]; | |
405 | r->start = (r->start + 1) % MCE_RING_SIZE; | |
406 | ret = 1; | |
407 | out: | |
408 | put_cpu(); | |
409 | return ret; | |
410 | } | |
411 | ||
412 | /* Always runs in MCE context with preempt off */ | |
413 | static int mce_ring_add(unsigned long pfn) | |
414 | { | |
415 | struct mce_ring *r = &__get_cpu_var(mce_ring); | |
416 | unsigned next; | |
417 | ||
418 | next = (r->end + 1) % MCE_RING_SIZE; | |
419 | if (next == r->start) | |
420 | return -1; | |
421 | r->ring[r->end] = pfn; | |
422 | wmb(); | |
423 | r->end = next; | |
424 | return 0; | |
425 | } | |
426 | ||
88ccbedd | 427 | int mce_available(struct cpuinfo_x86 *c) |
1da177e4 | 428 | { |
04b2b1a4 | 429 | if (mce_disabled) |
5b4408fd | 430 | return 0; |
3d1712c9 | 431 | return cpu_has(c, X86_FEATURE_MCE) && cpu_has(c, X86_FEATURE_MCA); |
1da177e4 LT |
432 | } |
433 | ||
9b1beaf2 AK |
434 | static void mce_schedule_work(void) |
435 | { | |
436 | if (!mce_ring_empty()) { | |
437 | struct work_struct *work = &__get_cpu_var(mce_work); | |
438 | if (!work_pending(work)) | |
439 | schedule_work(work); | |
440 | } | |
441 | } | |
442 | ||
1b2797dc HY |
443 | /* |
444 | * Get the address of the instruction at the time of the machine check | |
445 | * error. | |
446 | */ | |
94ad8474 AK |
447 | static inline void mce_get_rip(struct mce *m, struct pt_regs *regs) |
448 | { | |
1b2797dc HY |
449 | |
450 | if (regs && (m->mcgstatus & (MCG_STATUS_RIPV|MCG_STATUS_EIPV))) { | |
65ea5b03 | 451 | m->ip = regs->ip; |
94ad8474 AK |
452 | m->cs = regs->cs; |
453 | } else { | |
65ea5b03 | 454 | m->ip = 0; |
94ad8474 AK |
455 | m->cs = 0; |
456 | } | |
1b2797dc | 457 | if (rip_msr) |
5f8c1a54 | 458 | m->ip = mce_rdmsrl(rip_msr); |
94ad8474 AK |
459 | } |
460 | ||
11868a2d | 461 | #ifdef CONFIG_X86_LOCAL_APIC |
ccc3c319 AK |
462 | /* |
463 | * Called after interrupts have been reenabled again | |
464 | * when a MCE happened during an interrupts off region | |
465 | * in the kernel. | |
466 | */ | |
467 | asmlinkage void smp_mce_self_interrupt(struct pt_regs *regs) | |
468 | { | |
469 | ack_APIC_irq(); | |
470 | exit_idle(); | |
471 | irq_enter(); | |
9ff36ee9 | 472 | mce_notify_irq(); |
9b1beaf2 | 473 | mce_schedule_work(); |
ccc3c319 AK |
474 | irq_exit(); |
475 | } | |
476 | #endif | |
477 | ||
478 | static void mce_report_event(struct pt_regs *regs) | |
479 | { | |
480 | if (regs->flags & (X86_VM_MASK|X86_EFLAGS_IF)) { | |
9ff36ee9 | 481 | mce_notify_irq(); |
9b1beaf2 AK |
482 | /* |
483 | * Triggering the work queue here is just an insurance | |
484 | * policy in case the syscall exit notify handler | |
485 | * doesn't run soon enough or ends up running on the | |
486 | * wrong CPU (can happen when audit sleeps) | |
487 | */ | |
488 | mce_schedule_work(); | |
ccc3c319 AK |
489 | return; |
490 | } | |
491 | ||
492 | #ifdef CONFIG_X86_LOCAL_APIC | |
493 | /* | |
494 | * Without APIC do not notify. The event will be picked | |
495 | * up eventually. | |
496 | */ | |
497 | if (!cpu_has_apic) | |
498 | return; | |
499 | ||
500 | /* | |
501 | * When interrupts are disabled we cannot use | |
502 | * kernel services safely. Trigger an self interrupt | |
503 | * through the APIC to instead do the notification | |
504 | * after interrupts are reenabled again. | |
505 | */ | |
506 | apic->send_IPI_self(MCE_SELF_VECTOR); | |
507 | ||
508 | /* | |
509 | * Wait for idle afterwards again so that we don't leave the | |
510 | * APIC in a non idle state because the normal APIC writes | |
511 | * cannot exclude us. | |
512 | */ | |
513 | apic_wait_icr_idle(); | |
514 | #endif | |
515 | } | |
516 | ||
ca84f696 AK |
517 | DEFINE_PER_CPU(unsigned, mce_poll_count); |
518 | ||
d88203d1 | 519 | /* |
b79109c3 AK |
520 | * Poll for corrected events or events that happened before reset. |
521 | * Those are just logged through /dev/mcelog. | |
522 | * | |
523 | * This is executed in standard interrupt context. | |
ed7290d0 AK |
524 | * |
525 | * Note: spec recommends to panic for fatal unsignalled | |
526 | * errors here. However this would be quite problematic -- | |
527 | * we would need to reimplement the Monarch handling and | |
528 | * it would mess up the exclusion between exception handler | |
529 | * and poll hander -- * so we skip this for now. | |
530 | * These cases should not happen anyways, or only when the CPU | |
531 | * is already totally * confused. In this case it's likely it will | |
532 | * not fully execute the machine check handler either. | |
b79109c3 | 533 | */ |
ee031c31 | 534 | void machine_check_poll(enum mcp_flags flags, mce_banks_t *b) |
b79109c3 AK |
535 | { |
536 | struct mce m; | |
537 | int i; | |
538 | ||
ca84f696 AK |
539 | __get_cpu_var(mce_poll_count)++; |
540 | ||
b79109c3 AK |
541 | mce_setup(&m); |
542 | ||
5f8c1a54 | 543 | m.mcgstatus = mce_rdmsrl(MSR_IA32_MCG_STATUS); |
b79109c3 | 544 | for (i = 0; i < banks; i++) { |
cebe1820 | 545 | if (!mce_banks[i].ctl || !test_bit(i, *b)) |
b79109c3 AK |
546 | continue; |
547 | ||
548 | m.misc = 0; | |
549 | m.addr = 0; | |
550 | m.bank = i; | |
551 | m.tsc = 0; | |
552 | ||
553 | barrier(); | |
a2d32bcb | 554 | m.status = mce_rdmsrl(MSR_IA32_MCx_STATUS(i)); |
b79109c3 AK |
555 | if (!(m.status & MCI_STATUS_VAL)) |
556 | continue; | |
557 | ||
558 | /* | |
ed7290d0 AK |
559 | * Uncorrected or signalled events are handled by the exception |
560 | * handler when it is enabled, so don't process those here. | |
b79109c3 AK |
561 | * |
562 | * TBD do the same check for MCI_STATUS_EN here? | |
563 | */ | |
ed7290d0 AK |
564 | if (!(flags & MCP_UC) && |
565 | (m.status & (mce_ser ? MCI_STATUS_S : MCI_STATUS_UC))) | |
b79109c3 AK |
566 | continue; |
567 | ||
568 | if (m.status & MCI_STATUS_MISCV) | |
a2d32bcb | 569 | m.misc = mce_rdmsrl(MSR_IA32_MCx_MISC(i)); |
b79109c3 | 570 | if (m.status & MCI_STATUS_ADDRV) |
a2d32bcb | 571 | m.addr = mce_rdmsrl(MSR_IA32_MCx_ADDR(i)); |
b79109c3 AK |
572 | |
573 | if (!(flags & MCP_TIMESTAMP)) | |
574 | m.tsc = 0; | |
575 | /* | |
576 | * Don't get the IP here because it's unlikely to | |
577 | * have anything to do with the actual error location. | |
578 | */ | |
62fdac59 | 579 | if (!(flags & MCP_DONTLOG) && !mce_dont_log_ce) { |
5679af4c AK |
580 | mce_log(&m); |
581 | add_taint(TAINT_MACHINE_CHECK); | |
582 | } | |
b79109c3 AK |
583 | |
584 | /* | |
585 | * Clear state for this bank. | |
586 | */ | |
a2d32bcb | 587 | mce_wrmsrl(MSR_IA32_MCx_STATUS(i), 0); |
b79109c3 AK |
588 | } |
589 | ||
590 | /* | |
591 | * Don't clear MCG_STATUS here because it's only defined for | |
592 | * exceptions. | |
593 | */ | |
88921be3 AK |
594 | |
595 | sync_core(); | |
b79109c3 | 596 | } |
ea149b36 | 597 | EXPORT_SYMBOL_GPL(machine_check_poll); |
b79109c3 | 598 | |
bd19a5e6 AK |
599 | /* |
600 | * Do a quick check if any of the events requires a panic. | |
601 | * This decides if we keep the events around or clear them. | |
602 | */ | |
603 | static int mce_no_way_out(struct mce *m, char **msg) | |
604 | { | |
605 | int i; | |
606 | ||
607 | for (i = 0; i < banks; i++) { | |
a2d32bcb | 608 | m->status = mce_rdmsrl(MSR_IA32_MCx_STATUS(i)); |
bd19a5e6 AK |
609 | if (mce_severity(m, tolerant, msg) >= MCE_PANIC_SEVERITY) |
610 | return 1; | |
611 | } | |
612 | return 0; | |
613 | } | |
614 | ||
3c079792 AK |
615 | /* |
616 | * Variable to establish order between CPUs while scanning. | |
617 | * Each CPU spins initially until executing is equal its number. | |
618 | */ | |
619 | static atomic_t mce_executing; | |
620 | ||
621 | /* | |
622 | * Defines order of CPUs on entry. First CPU becomes Monarch. | |
623 | */ | |
624 | static atomic_t mce_callin; | |
625 | ||
626 | /* | |
627 | * Check if a timeout waiting for other CPUs happened. | |
628 | */ | |
629 | static int mce_timed_out(u64 *t) | |
630 | { | |
631 | /* | |
632 | * The others already did panic for some reason. | |
633 | * Bail out like in a timeout. | |
634 | * rmb() to tell the compiler that system_state | |
635 | * might have been modified by someone else. | |
636 | */ | |
637 | rmb(); | |
638 | if (atomic_read(&mce_paniced)) | |
639 | wait_for_panic(); | |
640 | if (!monarch_timeout) | |
641 | goto out; | |
642 | if ((s64)*t < SPINUNIT) { | |
643 | /* CHECKME: Make panic default for 1 too? */ | |
644 | if (tolerant < 1) | |
645 | mce_panic("Timeout synchronizing machine check over CPUs", | |
646 | NULL, NULL); | |
647 | cpu_missing = 1; | |
648 | return 1; | |
649 | } | |
650 | *t -= SPINUNIT; | |
651 | out: | |
652 | touch_nmi_watchdog(); | |
653 | return 0; | |
654 | } | |
655 | ||
656 | /* | |
657 | * The Monarch's reign. The Monarch is the CPU who entered | |
658 | * the machine check handler first. It waits for the others to | |
659 | * raise the exception too and then grades them. When any | |
660 | * error is fatal panic. Only then let the others continue. | |
661 | * | |
662 | * The other CPUs entering the MCE handler will be controlled by the | |
663 | * Monarch. They are called Subjects. | |
664 | * | |
665 | * This way we prevent any potential data corruption in a unrecoverable case | |
666 | * and also makes sure always all CPU's errors are examined. | |
667 | * | |
680b6cfd | 668 | * Also this detects the case of a machine check event coming from outer |
3c079792 AK |
669 | * space (not detected by any CPUs) In this case some external agent wants |
670 | * us to shut down, so panic too. | |
671 | * | |
672 | * The other CPUs might still decide to panic if the handler happens | |
673 | * in a unrecoverable place, but in this case the system is in a semi-stable | |
674 | * state and won't corrupt anything by itself. It's ok to let the others | |
675 | * continue for a bit first. | |
676 | * | |
677 | * All the spin loops have timeouts; when a timeout happens a CPU | |
678 | * typically elects itself to be Monarch. | |
679 | */ | |
680 | static void mce_reign(void) | |
681 | { | |
682 | int cpu; | |
683 | struct mce *m = NULL; | |
684 | int global_worst = 0; | |
685 | char *msg = NULL; | |
686 | char *nmsg = NULL; | |
687 | ||
688 | /* | |
689 | * This CPU is the Monarch and the other CPUs have run | |
690 | * through their handlers. | |
691 | * Grade the severity of the errors of all the CPUs. | |
692 | */ | |
693 | for_each_possible_cpu(cpu) { | |
694 | int severity = mce_severity(&per_cpu(mces_seen, cpu), tolerant, | |
695 | &nmsg); | |
696 | if (severity > global_worst) { | |
697 | msg = nmsg; | |
698 | global_worst = severity; | |
699 | m = &per_cpu(mces_seen, cpu); | |
700 | } | |
701 | } | |
702 | ||
703 | /* | |
704 | * Cannot recover? Panic here then. | |
705 | * This dumps all the mces in the log buffer and stops the | |
706 | * other CPUs. | |
707 | */ | |
708 | if (m && global_worst >= MCE_PANIC_SEVERITY && tolerant < 3) | |
ac960375 | 709 | mce_panic("Fatal Machine check", m, msg); |
3c079792 AK |
710 | |
711 | /* | |
712 | * For UC somewhere we let the CPU who detects it handle it. | |
713 | * Also must let continue the others, otherwise the handling | |
714 | * CPU could deadlock on a lock. | |
715 | */ | |
716 | ||
717 | /* | |
718 | * No machine check event found. Must be some external | |
719 | * source or one CPU is hung. Panic. | |
720 | */ | |
680b6cfd | 721 | if (global_worst <= MCE_KEEP_SEVERITY && tolerant < 3) |
3c079792 AK |
722 | mce_panic("Machine check from unknown source", NULL, NULL); |
723 | ||
724 | /* | |
725 | * Now clear all the mces_seen so that they don't reappear on | |
726 | * the next mce. | |
727 | */ | |
728 | for_each_possible_cpu(cpu) | |
729 | memset(&per_cpu(mces_seen, cpu), 0, sizeof(struct mce)); | |
730 | } | |
731 | ||
732 | static atomic_t global_nwo; | |
733 | ||
734 | /* | |
735 | * Start of Monarch synchronization. This waits until all CPUs have | |
736 | * entered the exception handler and then determines if any of them | |
737 | * saw a fatal event that requires panic. Then it executes them | |
738 | * in the entry order. | |
739 | * TBD double check parallel CPU hotunplug | |
740 | */ | |
7fb06fc9 | 741 | static int mce_start(int *no_way_out) |
3c079792 | 742 | { |
7fb06fc9 | 743 | int order; |
3c079792 AK |
744 | int cpus = num_online_cpus(); |
745 | u64 timeout = (u64)monarch_timeout * NSEC_PER_USEC; | |
746 | ||
7fb06fc9 HS |
747 | if (!timeout) |
748 | return -1; | |
3c079792 | 749 | |
7fb06fc9 | 750 | atomic_add(*no_way_out, &global_nwo); |
184e1fdf HY |
751 | /* |
752 | * global_nwo should be updated before mce_callin | |
753 | */ | |
754 | smp_wmb(); | |
a95436e4 | 755 | order = atomic_inc_return(&mce_callin); |
3c079792 AK |
756 | |
757 | /* | |
758 | * Wait for everyone. | |
759 | */ | |
760 | while (atomic_read(&mce_callin) != cpus) { | |
761 | if (mce_timed_out(&timeout)) { | |
762 | atomic_set(&global_nwo, 0); | |
7fb06fc9 | 763 | return -1; |
3c079792 AK |
764 | } |
765 | ndelay(SPINUNIT); | |
766 | } | |
767 | ||
184e1fdf HY |
768 | /* |
769 | * mce_callin should be read before global_nwo | |
770 | */ | |
771 | smp_rmb(); | |
3c079792 | 772 | |
7fb06fc9 HS |
773 | if (order == 1) { |
774 | /* | |
775 | * Monarch: Starts executing now, the others wait. | |
776 | */ | |
3c079792 | 777 | atomic_set(&mce_executing, 1); |
7fb06fc9 HS |
778 | } else { |
779 | /* | |
780 | * Subject: Now start the scanning loop one by one in | |
781 | * the original callin order. | |
782 | * This way when there are any shared banks it will be | |
783 | * only seen by one CPU before cleared, avoiding duplicates. | |
784 | */ | |
785 | while (atomic_read(&mce_executing) < order) { | |
786 | if (mce_timed_out(&timeout)) { | |
787 | atomic_set(&global_nwo, 0); | |
788 | return -1; | |
789 | } | |
790 | ndelay(SPINUNIT); | |
791 | } | |
3c079792 AK |
792 | } |
793 | ||
794 | /* | |
7fb06fc9 | 795 | * Cache the global no_way_out state. |
3c079792 | 796 | */ |
7fb06fc9 HS |
797 | *no_way_out = atomic_read(&global_nwo); |
798 | ||
799 | return order; | |
3c079792 AK |
800 | } |
801 | ||
802 | /* | |
803 | * Synchronize between CPUs after main scanning loop. | |
804 | * This invokes the bulk of the Monarch processing. | |
805 | */ | |
806 | static int mce_end(int order) | |
807 | { | |
808 | int ret = -1; | |
809 | u64 timeout = (u64)monarch_timeout * NSEC_PER_USEC; | |
810 | ||
811 | if (!timeout) | |
812 | goto reset; | |
813 | if (order < 0) | |
814 | goto reset; | |
815 | ||
816 | /* | |
817 | * Allow others to run. | |
818 | */ | |
819 | atomic_inc(&mce_executing); | |
820 | ||
821 | if (order == 1) { | |
822 | /* CHECKME: Can this race with a parallel hotplug? */ | |
823 | int cpus = num_online_cpus(); | |
824 | ||
825 | /* | |
826 | * Monarch: Wait for everyone to go through their scanning | |
827 | * loops. | |
828 | */ | |
829 | while (atomic_read(&mce_executing) <= cpus) { | |
830 | if (mce_timed_out(&timeout)) | |
831 | goto reset; | |
832 | ndelay(SPINUNIT); | |
833 | } | |
834 | ||
835 | mce_reign(); | |
836 | barrier(); | |
837 | ret = 0; | |
838 | } else { | |
839 | /* | |
840 | * Subject: Wait for Monarch to finish. | |
841 | */ | |
842 | while (atomic_read(&mce_executing) != 0) { | |
843 | if (mce_timed_out(&timeout)) | |
844 | goto reset; | |
845 | ndelay(SPINUNIT); | |
846 | } | |
847 | ||
848 | /* | |
849 | * Don't reset anything. That's done by the Monarch. | |
850 | */ | |
851 | return 0; | |
852 | } | |
853 | ||
854 | /* | |
855 | * Reset all global state. | |
856 | */ | |
857 | reset: | |
858 | atomic_set(&global_nwo, 0); | |
859 | atomic_set(&mce_callin, 0); | |
860 | barrier(); | |
861 | ||
862 | /* | |
863 | * Let others run again. | |
864 | */ | |
865 | atomic_set(&mce_executing, 0); | |
866 | return ret; | |
867 | } | |
868 | ||
9b1beaf2 AK |
869 | /* |
870 | * Check if the address reported by the CPU is in a format we can parse. | |
871 | * It would be possible to add code for most other cases, but all would | |
872 | * be somewhat complicated (e.g. segment offset would require an instruction | |
873 | * parser). So only support physical addresses upto page granuality for now. | |
874 | */ | |
875 | static int mce_usable_address(struct mce *m) | |
876 | { | |
877 | if (!(m->status & MCI_STATUS_MISCV) || !(m->status & MCI_STATUS_ADDRV)) | |
878 | return 0; | |
879 | if ((m->misc & 0x3f) > PAGE_SHIFT) | |
880 | return 0; | |
881 | if (((m->misc >> 6) & 7) != MCM_ADDR_PHYS) | |
882 | return 0; | |
883 | return 1; | |
884 | } | |
885 | ||
3c079792 AK |
886 | static void mce_clear_state(unsigned long *toclear) |
887 | { | |
888 | int i; | |
889 | ||
890 | for (i = 0; i < banks; i++) { | |
891 | if (test_bit(i, toclear)) | |
a2d32bcb | 892 | mce_wrmsrl(MSR_IA32_MCx_STATUS(i), 0); |
3c079792 AK |
893 | } |
894 | } | |
895 | ||
b79109c3 AK |
896 | /* |
897 | * The actual machine check handler. This only handles real | |
898 | * exceptions when something got corrupted coming in through int 18. | |
899 | * | |
900 | * This is executed in NMI context not subject to normal locking rules. This | |
901 | * implies that most kernel services cannot be safely used. Don't even | |
902 | * think about putting a printk in there! | |
3c079792 AK |
903 | * |
904 | * On Intel systems this is entered on all CPUs in parallel through | |
905 | * MCE broadcast. However some CPUs might be broken beyond repair, | |
906 | * so be always careful when synchronizing with others. | |
1da177e4 | 907 | */ |
e9eee03e | 908 | void do_machine_check(struct pt_regs *regs, long error_code) |
1da177e4 | 909 | { |
3c079792 | 910 | struct mce m, *final; |
1da177e4 | 911 | int i; |
3c079792 AK |
912 | int worst = 0; |
913 | int severity; | |
914 | /* | |
915 | * Establish sequential order between the CPUs entering the machine | |
916 | * check handler. | |
917 | */ | |
7fb06fc9 | 918 | int order; |
bd78432c TH |
919 | /* |
920 | * If no_way_out gets set, there is no safe way to recover from this | |
921 | * MCE. If tolerant is cranked up, we'll try anyway. | |
922 | */ | |
923 | int no_way_out = 0; | |
924 | /* | |
925 | * If kill_it gets set, there might be a way to recover from this | |
926 | * error. | |
927 | */ | |
928 | int kill_it = 0; | |
b79109c3 | 929 | DECLARE_BITMAP(toclear, MAX_NR_BANKS); |
bd19a5e6 | 930 | char *msg = "Unknown"; |
1da177e4 | 931 | |
553f265f AK |
932 | atomic_inc(&mce_entry); |
933 | ||
01ca79f1 AK |
934 | __get_cpu_var(mce_exception_count)++; |
935 | ||
b79109c3 | 936 | if (notify_die(DIE_NMI, "machine check", regs, error_code, |
22f5991c | 937 | 18, SIGKILL) == NOTIFY_STOP) |
32561696 | 938 | goto out; |
b79109c3 | 939 | if (!banks) |
32561696 | 940 | goto out; |
1da177e4 | 941 | |
b5f2fa4e AK |
942 | mce_setup(&m); |
943 | ||
5f8c1a54 | 944 | m.mcgstatus = mce_rdmsrl(MSR_IA32_MCG_STATUS); |
3c079792 AK |
945 | final = &__get_cpu_var(mces_seen); |
946 | *final = m; | |
947 | ||
680b6cfd HS |
948 | no_way_out = mce_no_way_out(&m, &msg); |
949 | ||
1da177e4 LT |
950 | barrier(); |
951 | ||
ed7290d0 AK |
952 | /* |
953 | * When no restart IP must always kill or panic. | |
954 | */ | |
955 | if (!(m.mcgstatus & MCG_STATUS_RIPV)) | |
956 | kill_it = 1; | |
957 | ||
3c079792 AK |
958 | /* |
959 | * Go through all the banks in exclusion of the other CPUs. | |
960 | * This way we don't report duplicated events on shared banks | |
961 | * because the first one to see it will clear it. | |
962 | */ | |
7fb06fc9 | 963 | order = mce_start(&no_way_out); |
1da177e4 | 964 | for (i = 0; i < banks; i++) { |
b79109c3 | 965 | __clear_bit(i, toclear); |
cebe1820 | 966 | if (!mce_banks[i].ctl) |
1da177e4 | 967 | continue; |
d88203d1 TG |
968 | |
969 | m.misc = 0; | |
1da177e4 LT |
970 | m.addr = 0; |
971 | m.bank = i; | |
1da177e4 | 972 | |
a2d32bcb | 973 | m.status = mce_rdmsrl(MSR_IA32_MCx_STATUS(i)); |
1da177e4 LT |
974 | if ((m.status & MCI_STATUS_VAL) == 0) |
975 | continue; | |
976 | ||
b79109c3 | 977 | /* |
ed7290d0 AK |
978 | * Non uncorrected or non signaled errors are handled by |
979 | * machine_check_poll. Leave them alone, unless this panics. | |
b79109c3 | 980 | */ |
ed7290d0 AK |
981 | if (!(m.status & (mce_ser ? MCI_STATUS_S : MCI_STATUS_UC)) && |
982 | !no_way_out) | |
b79109c3 AK |
983 | continue; |
984 | ||
985 | /* | |
986 | * Set taint even when machine check was not enabled. | |
987 | */ | |
988 | add_taint(TAINT_MACHINE_CHECK); | |
989 | ||
ed7290d0 | 990 | severity = mce_severity(&m, tolerant, NULL); |
b79109c3 | 991 | |
ed7290d0 AK |
992 | /* |
993 | * When machine check was for corrected handler don't touch, | |
994 | * unless we're panicing. | |
995 | */ | |
996 | if (severity == MCE_KEEP_SEVERITY && !no_way_out) | |
997 | continue; | |
998 | __set_bit(i, toclear); | |
999 | if (severity == MCE_NO_SEVERITY) { | |
b79109c3 AK |
1000 | /* |
1001 | * Machine check event was not enabled. Clear, but | |
1002 | * ignore. | |
1003 | */ | |
1004 | continue; | |
1da177e4 LT |
1005 | } |
1006 | ||
ed7290d0 AK |
1007 | /* |
1008 | * Kill on action required. | |
1009 | */ | |
1010 | if (severity == MCE_AR_SEVERITY) | |
1011 | kill_it = 1; | |
1012 | ||
1da177e4 | 1013 | if (m.status & MCI_STATUS_MISCV) |
a2d32bcb | 1014 | m.misc = mce_rdmsrl(MSR_IA32_MCx_MISC(i)); |
1da177e4 | 1015 | if (m.status & MCI_STATUS_ADDRV) |
a2d32bcb | 1016 | m.addr = mce_rdmsrl(MSR_IA32_MCx_ADDR(i)); |
1da177e4 | 1017 | |
9b1beaf2 AK |
1018 | /* |
1019 | * Action optional error. Queue address for later processing. | |
1020 | * When the ring overflows we just ignore the AO error. | |
1021 | * RED-PEN add some logging mechanism when | |
1022 | * usable_address or mce_add_ring fails. | |
1023 | * RED-PEN don't ignore overflow for tolerant == 0 | |
1024 | */ | |
1025 | if (severity == MCE_AO_SEVERITY && mce_usable_address(&m)) | |
1026 | mce_ring_add(m.addr >> PAGE_SHIFT); | |
1027 | ||
94ad8474 | 1028 | mce_get_rip(&m, regs); |
b79109c3 | 1029 | mce_log(&m); |
1da177e4 | 1030 | |
3c079792 AK |
1031 | if (severity > worst) { |
1032 | *final = m; | |
1033 | worst = severity; | |
1da177e4 | 1034 | } |
1da177e4 LT |
1035 | } |
1036 | ||
3c079792 AK |
1037 | if (!no_way_out) |
1038 | mce_clear_state(toclear); | |
1039 | ||
e9eee03e | 1040 | /* |
3c079792 AK |
1041 | * Do most of the synchronization with other CPUs. |
1042 | * When there's any problem use only local no_way_out state. | |
e9eee03e | 1043 | */ |
3c079792 AK |
1044 | if (mce_end(order) < 0) |
1045 | no_way_out = worst >= MCE_PANIC_SEVERITY; | |
bd78432c TH |
1046 | |
1047 | /* | |
1048 | * If we have decided that we just CAN'T continue, and the user | |
e9eee03e | 1049 | * has not set tolerant to an insane level, give up and die. |
3c079792 AK |
1050 | * |
1051 | * This is mainly used in the case when the system doesn't | |
1052 | * support MCE broadcasting or it has been disabled. | |
bd78432c TH |
1053 | */ |
1054 | if (no_way_out && tolerant < 3) | |
ac960375 | 1055 | mce_panic("Fatal machine check on current CPU", final, msg); |
bd78432c TH |
1056 | |
1057 | /* | |
1058 | * If the error seems to be unrecoverable, something should be | |
1059 | * done. Try to kill as little as possible. If we can kill just | |
1060 | * one task, do that. If the user has set the tolerance very | |
1061 | * high, don't try to do anything at all. | |
1062 | */ | |
bd78432c | 1063 | |
ed7290d0 AK |
1064 | if (kill_it && tolerant < 3) |
1065 | force_sig(SIGBUS, current); | |
1da177e4 | 1066 | |
e02e68d3 TH |
1067 | /* notify userspace ASAP */ |
1068 | set_thread_flag(TIF_MCE_NOTIFY); | |
1069 | ||
3c079792 AK |
1070 | if (worst > 0) |
1071 | mce_report_event(regs); | |
5f8c1a54 | 1072 | mce_wrmsrl(MSR_IA32_MCG_STATUS, 0); |
32561696 | 1073 | out: |
553f265f | 1074 | atomic_dec(&mce_entry); |
88921be3 | 1075 | sync_core(); |
1da177e4 | 1076 | } |
ea149b36 | 1077 | EXPORT_SYMBOL_GPL(do_machine_check); |
1da177e4 | 1078 | |
9b1beaf2 AK |
1079 | /* dummy to break dependency. actual code is in mm/memory-failure.c */ |
1080 | void __attribute__((weak)) memory_failure(unsigned long pfn, int vector) | |
1081 | { | |
1082 | printk(KERN_ERR "Action optional memory failure at %lx ignored\n", pfn); | |
1083 | } | |
1084 | ||
1085 | /* | |
1086 | * Called after mce notification in process context. This code | |
1087 | * is allowed to sleep. Call the high level VM handler to process | |
1088 | * any corrupted pages. | |
1089 | * Assume that the work queue code only calls this one at a time | |
1090 | * per CPU. | |
1091 | * Note we don't disable preemption, so this code might run on the wrong | |
1092 | * CPU. In this case the event is picked up by the scheduled work queue. | |
1093 | * This is merely a fast path to expedite processing in some common | |
1094 | * cases. | |
1095 | */ | |
1096 | void mce_notify_process(void) | |
1097 | { | |
1098 | unsigned long pfn; | |
1099 | mce_notify_irq(); | |
1100 | while (mce_ring_get(&pfn)) | |
1101 | memory_failure(pfn, MCE_VECTOR); | |
1102 | } | |
1103 | ||
1104 | static void mce_process_work(struct work_struct *dummy) | |
1105 | { | |
1106 | mce_notify_process(); | |
1107 | } | |
1108 | ||
15d5f839 DZ |
1109 | #ifdef CONFIG_X86_MCE_INTEL |
1110 | /*** | |
1111 | * mce_log_therm_throt_event - Logs the thermal throttling event to mcelog | |
676b1855 | 1112 | * @cpu: The CPU on which the event occurred. |
15d5f839 DZ |
1113 | * @status: Event status information |
1114 | * | |
1115 | * This function should be called by the thermal interrupt after the | |
1116 | * event has been processed and the decision was made to log the event | |
1117 | * further. | |
1118 | * | |
1119 | * The status parameter will be saved to the 'status' field of 'struct mce' | |
1120 | * and historically has been the register value of the | |
1121 | * MSR_IA32_THERMAL_STATUS (Intel) msr. | |
1122 | */ | |
b5f2fa4e | 1123 | void mce_log_therm_throt_event(__u64 status) |
15d5f839 DZ |
1124 | { |
1125 | struct mce m; | |
1126 | ||
b5f2fa4e | 1127 | mce_setup(&m); |
15d5f839 DZ |
1128 | m.bank = MCE_THERMAL_BANK; |
1129 | m.status = status; | |
15d5f839 DZ |
1130 | mce_log(&m); |
1131 | } | |
1132 | #endif /* CONFIG_X86_MCE_INTEL */ | |
1133 | ||
1da177e4 | 1134 | /* |
8a336b0a TH |
1135 | * Periodic polling timer for "silent" machine check errors. If the |
1136 | * poller finds an MCE, poll 2x faster. When the poller finds no more | |
1137 | * errors, poll 2x slower (up to check_interval seconds). | |
1da177e4 | 1138 | */ |
1da177e4 | 1139 | static int check_interval = 5 * 60; /* 5 minutes */ |
e9eee03e | 1140 | |
245b2e70 | 1141 | static DEFINE_PER_CPU(int, mce_next_interval); /* in jiffies */ |
52d168e2 | 1142 | static DEFINE_PER_CPU(struct timer_list, mce_timer); |
1da177e4 | 1143 | |
5e09954a | 1144 | static void mce_start_timer(unsigned long data) |
1da177e4 | 1145 | { |
52d168e2 | 1146 | struct timer_list *t = &per_cpu(mce_timer, data); |
6298c512 | 1147 | int *n; |
52d168e2 AK |
1148 | |
1149 | WARN_ON(smp_processor_id() != data); | |
1150 | ||
e9eee03e | 1151 | if (mce_available(¤t_cpu_data)) { |
ee031c31 AK |
1152 | machine_check_poll(MCP_TIMESTAMP, |
1153 | &__get_cpu_var(mce_poll_banks)); | |
e9eee03e | 1154 | } |
1da177e4 LT |
1155 | |
1156 | /* | |
e02e68d3 TH |
1157 | * Alert userspace if needed. If we logged an MCE, reduce the |
1158 | * polling interval, otherwise increase the polling interval. | |
1da177e4 | 1159 | */ |
245b2e70 | 1160 | n = &__get_cpu_var(mce_next_interval); |
9ff36ee9 | 1161 | if (mce_notify_irq()) |
6298c512 | 1162 | *n = max(*n/2, HZ/100); |
14a02530 | 1163 | else |
6298c512 | 1164 | *n = min(*n*2, (int)round_jiffies_relative(check_interval*HZ)); |
e02e68d3 | 1165 | |
6298c512 | 1166 | t->expires = jiffies + *n; |
5be6066a | 1167 | add_timer_on(t, smp_processor_id()); |
e02e68d3 TH |
1168 | } |
1169 | ||
9bd98405 AK |
1170 | static void mce_do_trigger(struct work_struct *work) |
1171 | { | |
1020bcbc | 1172 | call_usermodehelper(mce_helper, mce_helper_argv, NULL, UMH_NO_WAIT); |
9bd98405 AK |
1173 | } |
1174 | ||
1175 | static DECLARE_WORK(mce_trigger_work, mce_do_trigger); | |
1176 | ||
e02e68d3 | 1177 | /* |
9bd98405 AK |
1178 | * Notify the user(s) about new machine check events. |
1179 | * Can be called from interrupt context, but not from machine check/NMI | |
1180 | * context. | |
e02e68d3 | 1181 | */ |
9ff36ee9 | 1182 | int mce_notify_irq(void) |
e02e68d3 | 1183 | { |
8457c84d AK |
1184 | /* Not more than two messages every minute */ |
1185 | static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2); | |
1186 | ||
e02e68d3 | 1187 | clear_thread_flag(TIF_MCE_NOTIFY); |
e9eee03e | 1188 | |
1020bcbc | 1189 | if (test_and_clear_bit(0, &mce_need_notify)) { |
e02e68d3 | 1190 | wake_up_interruptible(&mce_wait); |
9bd98405 AK |
1191 | |
1192 | /* | |
1193 | * There is no risk of missing notifications because | |
1194 | * work_pending is always cleared before the function is | |
1195 | * executed. | |
1196 | */ | |
1020bcbc | 1197 | if (mce_helper[0] && !work_pending(&mce_trigger_work)) |
9bd98405 | 1198 | schedule_work(&mce_trigger_work); |
e02e68d3 | 1199 | |
8457c84d | 1200 | if (__ratelimit(&ratelimit)) |
8a336b0a | 1201 | printk(KERN_INFO "Machine check events logged\n"); |
e02e68d3 TH |
1202 | |
1203 | return 1; | |
1da177e4 | 1204 | } |
e02e68d3 TH |
1205 | return 0; |
1206 | } | |
9ff36ee9 | 1207 | EXPORT_SYMBOL_GPL(mce_notify_irq); |
8a336b0a | 1208 | |
cffd377e | 1209 | static int __cpuinit __mcheck_cpu_mce_banks_init(void) |
cebe1820 AK |
1210 | { |
1211 | int i; | |
1212 | ||
1213 | mce_banks = kzalloc(banks * sizeof(struct mce_bank), GFP_KERNEL); | |
1214 | if (!mce_banks) | |
1215 | return -ENOMEM; | |
1216 | for (i = 0; i < banks; i++) { | |
1217 | struct mce_bank *b = &mce_banks[i]; | |
11868a2d | 1218 | |
cebe1820 AK |
1219 | b->ctl = -1ULL; |
1220 | b->init = 1; | |
1221 | } | |
1222 | return 0; | |
1223 | } | |
1224 | ||
d88203d1 | 1225 | /* |
1da177e4 LT |
1226 | * Initialize Machine Checks for a CPU. |
1227 | */ | |
5e09954a | 1228 | static int __cpuinit __mcheck_cpu_cap_init(void) |
1da177e4 | 1229 | { |
0d7482e3 | 1230 | unsigned b; |
e9eee03e | 1231 | u64 cap; |
1da177e4 LT |
1232 | |
1233 | rdmsrl(MSR_IA32_MCG_CAP, cap); | |
01c6680a TG |
1234 | |
1235 | b = cap & MCG_BANKCNT_MASK; | |
93ae5012 RD |
1236 | if (!banks) |
1237 | printk(KERN_INFO "mce: CPU supports %d MCE banks\n", b); | |
b659294b | 1238 | |
0d7482e3 AK |
1239 | if (b > MAX_NR_BANKS) { |
1240 | printk(KERN_WARNING | |
1241 | "MCE: Using only %u machine check banks out of %u\n", | |
1242 | MAX_NR_BANKS, b); | |
1243 | b = MAX_NR_BANKS; | |
1244 | } | |
1245 | ||
1246 | /* Don't support asymmetric configurations today */ | |
1247 | WARN_ON(banks != 0 && b != banks); | |
1248 | banks = b; | |
cebe1820 | 1249 | if (!mce_banks) { |
cffd377e | 1250 | int err = __mcheck_cpu_mce_banks_init(); |
11868a2d | 1251 | |
cebe1820 AK |
1252 | if (err) |
1253 | return err; | |
1da177e4 | 1254 | } |
0d7482e3 | 1255 | |
94ad8474 | 1256 | /* Use accurate RIP reporting if available. */ |
01c6680a | 1257 | if ((cap & MCG_EXT_P) && MCG_EXT_CNT(cap) >= 9) |
94ad8474 | 1258 | rip_msr = MSR_IA32_MCG_EIP; |
1da177e4 | 1259 | |
ed7290d0 AK |
1260 | if (cap & MCG_SER_P) |
1261 | mce_ser = 1; | |
1262 | ||
0d7482e3 AK |
1263 | return 0; |
1264 | } | |
1265 | ||
5e09954a | 1266 | static void __mcheck_cpu_init_generic(void) |
0d7482e3 | 1267 | { |
e9eee03e | 1268 | mce_banks_t all_banks; |
0d7482e3 AK |
1269 | u64 cap; |
1270 | int i; | |
1271 | ||
b79109c3 AK |
1272 | /* |
1273 | * Log the machine checks left over from the previous reset. | |
1274 | */ | |
ee031c31 | 1275 | bitmap_fill(all_banks, MAX_NR_BANKS); |
5679af4c | 1276 | machine_check_poll(MCP_UC|(!mce_bootlog ? MCP_DONTLOG : 0), &all_banks); |
1da177e4 LT |
1277 | |
1278 | set_in_cr4(X86_CR4_MCE); | |
1279 | ||
0d7482e3 | 1280 | rdmsrl(MSR_IA32_MCG_CAP, cap); |
1da177e4 LT |
1281 | if (cap & MCG_CTL_P) |
1282 | wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff); | |
1283 | ||
1284 | for (i = 0; i < banks; i++) { | |
cebe1820 | 1285 | struct mce_bank *b = &mce_banks[i]; |
11868a2d | 1286 | |
cebe1820 | 1287 | if (!b->init) |
06b7a7a5 | 1288 | continue; |
a2d32bcb AK |
1289 | wrmsrl(MSR_IA32_MCx_CTL(i), b->ctl); |
1290 | wrmsrl(MSR_IA32_MCx_STATUS(i), 0); | |
d88203d1 | 1291 | } |
1da177e4 LT |
1292 | } |
1293 | ||
1294 | /* Add per CPU specific workarounds here */ | |
5e09954a | 1295 | static int __cpuinit __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c) |
d88203d1 | 1296 | { |
e412cd25 IM |
1297 | if (c->x86_vendor == X86_VENDOR_UNKNOWN) { |
1298 | pr_info("MCE: unknown CPU type - not enabling MCE support.\n"); | |
1299 | return -EOPNOTSUPP; | |
1300 | } | |
1301 | ||
1da177e4 | 1302 | /* This should be disabled by the BIOS, but isn't always */ |
911f6a7b | 1303 | if (c->x86_vendor == X86_VENDOR_AMD) { |
e9eee03e IM |
1304 | if (c->x86 == 15 && banks > 4) { |
1305 | /* | |
1306 | * disable GART TBL walk error reporting, which | |
1307 | * trips off incorrectly with the IOMMU & 3ware | |
1308 | * & Cerberus: | |
1309 | */ | |
cebe1820 | 1310 | clear_bit(10, (unsigned long *)&mce_banks[4].ctl); |
e9eee03e IM |
1311 | } |
1312 | if (c->x86 <= 17 && mce_bootlog < 0) { | |
1313 | /* | |
1314 | * Lots of broken BIOS around that don't clear them | |
1315 | * by default and leave crap in there. Don't log: | |
1316 | */ | |
911f6a7b | 1317 | mce_bootlog = 0; |
e9eee03e | 1318 | } |
2e6f694f AK |
1319 | /* |
1320 | * Various K7s with broken bank 0 around. Always disable | |
1321 | * by default. | |
1322 | */ | |
203abd67 | 1323 | if (c->x86 == 6 && banks > 0) |
cebe1820 | 1324 | mce_banks[0].ctl = 0; |
1da177e4 | 1325 | } |
e583538f | 1326 | |
06b7a7a5 AK |
1327 | if (c->x86_vendor == X86_VENDOR_INTEL) { |
1328 | /* | |
1329 | * SDM documents that on family 6 bank 0 should not be written | |
1330 | * because it aliases to another special BIOS controlled | |
1331 | * register. | |
1332 | * But it's not aliased anymore on model 0x1a+ | |
1333 | * Don't ignore bank 0 completely because there could be a | |
1334 | * valid event later, merely don't write CTL0. | |
1335 | */ | |
1336 | ||
cebe1820 AK |
1337 | if (c->x86 == 6 && c->x86_model < 0x1A && banks > 0) |
1338 | mce_banks[0].init = 0; | |
3c079792 AK |
1339 | |
1340 | /* | |
1341 | * All newer Intel systems support MCE broadcasting. Enable | |
1342 | * synchronization with a one second timeout. | |
1343 | */ | |
1344 | if ((c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xe)) && | |
1345 | monarch_timeout < 0) | |
1346 | monarch_timeout = USEC_PER_SEC; | |
c7f6fa44 | 1347 | |
e412cd25 IM |
1348 | /* |
1349 | * There are also broken BIOSes on some Pentium M and | |
1350 | * earlier systems: | |
1351 | */ | |
1352 | if (c->x86 == 6 && c->x86_model <= 13 && mce_bootlog < 0) | |
c7f6fa44 | 1353 | mce_bootlog = 0; |
06b7a7a5 | 1354 | } |
3c079792 AK |
1355 | if (monarch_timeout < 0) |
1356 | monarch_timeout = 0; | |
29b0f591 AK |
1357 | if (mce_bootlog != 0) |
1358 | mce_panic_timeout = 30; | |
e412cd25 IM |
1359 | |
1360 | return 0; | |
d88203d1 | 1361 | } |
1da177e4 | 1362 | |
5e09954a | 1363 | static void __cpuinit __mcheck_cpu_ancient_init(struct cpuinfo_x86 *c) |
4efc0670 AK |
1364 | { |
1365 | if (c->x86 != 5) | |
1366 | return; | |
1367 | switch (c->x86_vendor) { | |
1368 | case X86_VENDOR_INTEL: | |
c6978369 | 1369 | intel_p5_mcheck_init(c); |
4efc0670 AK |
1370 | break; |
1371 | case X86_VENDOR_CENTAUR: | |
1372 | winchip_mcheck_init(c); | |
1373 | break; | |
1374 | } | |
1375 | } | |
1376 | ||
5e09954a | 1377 | static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c) |
1da177e4 LT |
1378 | { |
1379 | switch (c->x86_vendor) { | |
1380 | case X86_VENDOR_INTEL: | |
1381 | mce_intel_feature_init(c); | |
1382 | break; | |
89b831ef JS |
1383 | case X86_VENDOR_AMD: |
1384 | mce_amd_feature_init(c); | |
1385 | break; | |
1da177e4 LT |
1386 | default: |
1387 | break; | |
1388 | } | |
1389 | } | |
1390 | ||
5e09954a | 1391 | static void __mcheck_cpu_init_timer(void) |
52d168e2 AK |
1392 | { |
1393 | struct timer_list *t = &__get_cpu_var(mce_timer); | |
245b2e70 | 1394 | int *n = &__get_cpu_var(mce_next_interval); |
52d168e2 | 1395 | |
bc09effa JB |
1396 | setup_timer(t, mce_start_timer, smp_processor_id()); |
1397 | ||
62fdac59 HS |
1398 | if (mce_ignore_ce) |
1399 | return; | |
1400 | ||
6298c512 AK |
1401 | *n = check_interval * HZ; |
1402 | if (!*n) | |
52d168e2 | 1403 | return; |
6298c512 | 1404 | t->expires = round_jiffies(jiffies + *n); |
5be6066a | 1405 | add_timer_on(t, smp_processor_id()); |
52d168e2 AK |
1406 | } |
1407 | ||
9eda8cb3 AK |
1408 | /* Handle unconfigured int18 (should never happen) */ |
1409 | static void unexpected_machine_check(struct pt_regs *regs, long error_code) | |
1410 | { | |
1411 | printk(KERN_ERR "CPU#%d: Unexpected int18 (Machine Check).\n", | |
1412 | smp_processor_id()); | |
1413 | } | |
1414 | ||
1415 | /* Call the installed machine check handler for this CPU setup. */ | |
1416 | void (*machine_check_vector)(struct pt_regs *, long error_code) = | |
1417 | unexpected_machine_check; | |
1418 | ||
d88203d1 | 1419 | /* |
1da177e4 | 1420 | * Called for each booted CPU to set up machine checks. |
e9eee03e | 1421 | * Must be called with preempt off: |
1da177e4 | 1422 | */ |
5e09954a | 1423 | void __cpuinit mcheck_cpu_init(struct cpuinfo_x86 *c) |
1da177e4 | 1424 | { |
4efc0670 AK |
1425 | if (mce_disabled) |
1426 | return; | |
1427 | ||
5e09954a | 1428 | __mcheck_cpu_ancient_init(c); |
4efc0670 | 1429 | |
5b4408fd | 1430 | if (!mce_available(c)) |
1da177e4 LT |
1431 | return; |
1432 | ||
5e09954a | 1433 | if (__mcheck_cpu_cap_init() < 0 || __mcheck_cpu_apply_quirks(c) < 0) { |
04b2b1a4 | 1434 | mce_disabled = 1; |
0d7482e3 AK |
1435 | return; |
1436 | } | |
0d7482e3 | 1437 | |
5d727926 AK |
1438 | machine_check_vector = do_machine_check; |
1439 | ||
5e09954a BP |
1440 | __mcheck_cpu_init_generic(); |
1441 | __mcheck_cpu_init_vendor(c); | |
1442 | __mcheck_cpu_init_timer(); | |
9b1beaf2 | 1443 | INIT_WORK(&__get_cpu_var(mce_work), mce_process_work); |
fb253195 | 1444 | |
1da177e4 LT |
1445 | } |
1446 | ||
1447 | /* | |
1448 | * Character device to read and clear the MCE log. | |
1449 | */ | |
1450 | ||
f528e7ba | 1451 | static DEFINE_SPINLOCK(mce_state_lock); |
e9eee03e IM |
1452 | static int open_count; /* #times opened */ |
1453 | static int open_exclu; /* already open exclusive? */ | |
f528e7ba TH |
1454 | |
1455 | static int mce_open(struct inode *inode, struct file *file) | |
1456 | { | |
1457 | spin_lock(&mce_state_lock); | |
1458 | ||
1459 | if (open_exclu || (open_count && (file->f_flags & O_EXCL))) { | |
1460 | spin_unlock(&mce_state_lock); | |
e9eee03e | 1461 | |
f528e7ba TH |
1462 | return -EBUSY; |
1463 | } | |
1464 | ||
1465 | if (file->f_flags & O_EXCL) | |
1466 | open_exclu = 1; | |
1467 | open_count++; | |
1468 | ||
1469 | spin_unlock(&mce_state_lock); | |
1470 | ||
bd78432c | 1471 | return nonseekable_open(inode, file); |
f528e7ba TH |
1472 | } |
1473 | ||
1474 | static int mce_release(struct inode *inode, struct file *file) | |
1475 | { | |
1476 | spin_lock(&mce_state_lock); | |
1477 | ||
1478 | open_count--; | |
1479 | open_exclu = 0; | |
1480 | ||
1481 | spin_unlock(&mce_state_lock); | |
1482 | ||
1483 | return 0; | |
1484 | } | |
1485 | ||
d88203d1 TG |
1486 | static void collect_tscs(void *data) |
1487 | { | |
1da177e4 | 1488 | unsigned long *cpu_tsc = (unsigned long *)data; |
d88203d1 | 1489 | |
1da177e4 | 1490 | rdtscll(cpu_tsc[smp_processor_id()]); |
d88203d1 | 1491 | } |
1da177e4 | 1492 | |
e9eee03e IM |
1493 | static DEFINE_MUTEX(mce_read_mutex); |
1494 | ||
d88203d1 TG |
1495 | static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize, |
1496 | loff_t *off) | |
1da177e4 | 1497 | { |
e9eee03e | 1498 | char __user *buf = ubuf; |
f0de53bb | 1499 | unsigned long *cpu_tsc; |
ef41df43 | 1500 | unsigned prev, next; |
1da177e4 LT |
1501 | int i, err; |
1502 | ||
6bca67f9 | 1503 | cpu_tsc = kmalloc(nr_cpu_ids * sizeof(long), GFP_KERNEL); |
f0de53bb AK |
1504 | if (!cpu_tsc) |
1505 | return -ENOMEM; | |
1506 | ||
8c8b8859 | 1507 | mutex_lock(&mce_read_mutex); |
f56e8a07 | 1508 | next = rcu_dereference_check_mce(mcelog.next); |
1da177e4 LT |
1509 | |
1510 | /* Only supports full reads right now */ | |
d88203d1 | 1511 | if (*off != 0 || usize < MCE_LOG_LEN*sizeof(struct mce)) { |
8c8b8859 | 1512 | mutex_unlock(&mce_read_mutex); |
f0de53bb | 1513 | kfree(cpu_tsc); |
e9eee03e | 1514 | |
1da177e4 LT |
1515 | return -EINVAL; |
1516 | } | |
1517 | ||
1518 | err = 0; | |
ef41df43 HY |
1519 | prev = 0; |
1520 | do { | |
1521 | for (i = prev; i < next; i++) { | |
1522 | unsigned long start = jiffies; | |
1523 | ||
1524 | while (!mcelog.entry[i].finished) { | |
1525 | if (time_after_eq(jiffies, start + 2)) { | |
1526 | memset(mcelog.entry + i, 0, | |
1527 | sizeof(struct mce)); | |
1528 | goto timeout; | |
1529 | } | |
1530 | cpu_relax(); | |
673242c1 | 1531 | } |
ef41df43 HY |
1532 | smp_rmb(); |
1533 | err |= copy_to_user(buf, mcelog.entry + i, | |
1534 | sizeof(struct mce)); | |
1535 | buf += sizeof(struct mce); | |
1536 | timeout: | |
1537 | ; | |
673242c1 | 1538 | } |
1da177e4 | 1539 | |
ef41df43 HY |
1540 | memset(mcelog.entry + prev, 0, |
1541 | (next - prev) * sizeof(struct mce)); | |
1542 | prev = next; | |
1543 | next = cmpxchg(&mcelog.next, prev, 0); | |
1544 | } while (next != prev); | |
1da177e4 | 1545 | |
b2b18660 | 1546 | synchronize_sched(); |
1da177e4 | 1547 | |
d88203d1 TG |
1548 | /* |
1549 | * Collect entries that were still getting written before the | |
1550 | * synchronize. | |
1551 | */ | |
15c8b6c1 | 1552 | on_each_cpu(collect_tscs, cpu_tsc, 1); |
e9eee03e | 1553 | |
d88203d1 TG |
1554 | for (i = next; i < MCE_LOG_LEN; i++) { |
1555 | if (mcelog.entry[i].finished && | |
1556 | mcelog.entry[i].tsc < cpu_tsc[mcelog.entry[i].cpu]) { | |
1557 | err |= copy_to_user(buf, mcelog.entry+i, | |
1558 | sizeof(struct mce)); | |
1da177e4 LT |
1559 | smp_rmb(); |
1560 | buf += sizeof(struct mce); | |
1561 | memset(&mcelog.entry[i], 0, sizeof(struct mce)); | |
1562 | } | |
d88203d1 | 1563 | } |
8c8b8859 | 1564 | mutex_unlock(&mce_read_mutex); |
f0de53bb | 1565 | kfree(cpu_tsc); |
e9eee03e | 1566 | |
d88203d1 | 1567 | return err ? -EFAULT : buf - ubuf; |
1da177e4 LT |
1568 | } |
1569 | ||
e02e68d3 TH |
1570 | static unsigned int mce_poll(struct file *file, poll_table *wait) |
1571 | { | |
1572 | poll_wait(file, &mce_wait, wait); | |
f56e8a07 | 1573 | if (rcu_dereference_check_mce(mcelog.next)) |
e02e68d3 TH |
1574 | return POLLIN | POLLRDNORM; |
1575 | return 0; | |
1576 | } | |
1577 | ||
c68461b6 | 1578 | static long mce_ioctl(struct file *f, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
1579 | { |
1580 | int __user *p = (int __user *)arg; | |
d88203d1 | 1581 | |
1da177e4 | 1582 | if (!capable(CAP_SYS_ADMIN)) |
d88203d1 | 1583 | return -EPERM; |
e9eee03e | 1584 | |
1da177e4 | 1585 | switch (cmd) { |
d88203d1 | 1586 | case MCE_GET_RECORD_LEN: |
1da177e4 LT |
1587 | return put_user(sizeof(struct mce), p); |
1588 | case MCE_GET_LOG_LEN: | |
d88203d1 | 1589 | return put_user(MCE_LOG_LEN, p); |
1da177e4 LT |
1590 | case MCE_GETCLEAR_FLAGS: { |
1591 | unsigned flags; | |
d88203d1 TG |
1592 | |
1593 | do { | |
1da177e4 | 1594 | flags = mcelog.flags; |
d88203d1 | 1595 | } while (cmpxchg(&mcelog.flags, flags, 0) != flags); |
e9eee03e | 1596 | |
d88203d1 | 1597 | return put_user(flags, p); |
1da177e4 LT |
1598 | } |
1599 | default: | |
d88203d1 TG |
1600 | return -ENOTTY; |
1601 | } | |
1da177e4 LT |
1602 | } |
1603 | ||
a1ff41bf | 1604 | /* Modified in mce-inject.c, so not static or const */ |
ea149b36 | 1605 | struct file_operations mce_chrdev_ops = { |
e9eee03e IM |
1606 | .open = mce_open, |
1607 | .release = mce_release, | |
1608 | .read = mce_read, | |
1609 | .poll = mce_poll, | |
1610 | .unlocked_ioctl = mce_ioctl, | |
1da177e4 | 1611 | }; |
ea149b36 | 1612 | EXPORT_SYMBOL_GPL(mce_chrdev_ops); |
1da177e4 LT |
1613 | |
1614 | static struct miscdevice mce_log_device = { | |
1615 | MISC_MCELOG_MINOR, | |
1616 | "mcelog", | |
1617 | &mce_chrdev_ops, | |
1618 | }; | |
1619 | ||
13503fa9 | 1620 | /* |
62fdac59 HS |
1621 | * mce=off Disables machine check |
1622 | * mce=no_cmci Disables CMCI | |
1623 | * mce=dont_log_ce Clears corrected events silently, no log created for CEs. | |
1624 | * mce=ignore_ce Disables polling and CMCI, corrected events are not cleared. | |
3c079792 AK |
1625 | * mce=TOLERANCELEVEL[,monarchtimeout] (number, see above) |
1626 | * monarchtimeout is how long to wait for other CPUs on machine | |
1627 | * check, or 0 to not wait | |
13503fa9 HS |
1628 | * mce=bootlog Log MCEs from before booting. Disabled by default on AMD. |
1629 | * mce=nobootlog Don't log MCEs from before booting. | |
1630 | */ | |
1da177e4 LT |
1631 | static int __init mcheck_enable(char *str) |
1632 | { | |
e3346fc4 | 1633 | if (*str == 0) { |
4efc0670 | 1634 | enable_p5_mce(); |
e3346fc4 BZ |
1635 | return 1; |
1636 | } | |
4efc0670 AK |
1637 | if (*str == '=') |
1638 | str++; | |
1da177e4 | 1639 | if (!strcmp(str, "off")) |
04b2b1a4 | 1640 | mce_disabled = 1; |
62fdac59 HS |
1641 | else if (!strcmp(str, "no_cmci")) |
1642 | mce_cmci_disabled = 1; | |
1643 | else if (!strcmp(str, "dont_log_ce")) | |
1644 | mce_dont_log_ce = 1; | |
1645 | else if (!strcmp(str, "ignore_ce")) | |
1646 | mce_ignore_ce = 1; | |
13503fa9 HS |
1647 | else if (!strcmp(str, "bootlog") || !strcmp(str, "nobootlog")) |
1648 | mce_bootlog = (str[0] == 'b'); | |
3c079792 | 1649 | else if (isdigit(str[0])) { |
8c566ef5 | 1650 | get_option(&str, &tolerant); |
3c079792 AK |
1651 | if (*str == ',') { |
1652 | ++str; | |
1653 | get_option(&str, &monarch_timeout); | |
1654 | } | |
1655 | } else { | |
4efc0670 | 1656 | printk(KERN_INFO "mce argument %s ignored. Please use /sys\n", |
13503fa9 HS |
1657 | str); |
1658 | return 0; | |
1659 | } | |
9b41046c | 1660 | return 1; |
1da177e4 | 1661 | } |
4efc0670 | 1662 | __setup("mce", mcheck_enable); |
1da177e4 | 1663 | |
a2202aa2 | 1664 | int __init mcheck_init(void) |
b33a6363 BP |
1665 | { |
1666 | atomic_notifier_chain_register(&x86_mce_decoder_chain, &mce_dec_nb); | |
1667 | ||
a2202aa2 YW |
1668 | mcheck_intel_therm_init(); |
1669 | ||
b33a6363 BP |
1670 | return 0; |
1671 | } | |
b33a6363 | 1672 | |
d88203d1 | 1673 | /* |
1da177e4 | 1674 | * Sysfs support |
d88203d1 | 1675 | */ |
1da177e4 | 1676 | |
973a2dd1 AK |
1677 | /* |
1678 | * Disable machine checks on suspend and shutdown. We can't really handle | |
1679 | * them later. | |
1680 | */ | |
5e09954a | 1681 | static int mce_disable_error_reporting(void) |
973a2dd1 AK |
1682 | { |
1683 | int i; | |
1684 | ||
06b7a7a5 | 1685 | for (i = 0; i < banks; i++) { |
cebe1820 | 1686 | struct mce_bank *b = &mce_banks[i]; |
11868a2d | 1687 | |
cebe1820 | 1688 | if (b->init) |
a2d32bcb | 1689 | wrmsrl(MSR_IA32_MCx_CTL(i), 0); |
06b7a7a5 | 1690 | } |
973a2dd1 AK |
1691 | return 0; |
1692 | } | |
1693 | ||
1694 | static int mce_suspend(struct sys_device *dev, pm_message_t state) | |
1695 | { | |
5e09954a | 1696 | return mce_disable_error_reporting(); |
973a2dd1 AK |
1697 | } |
1698 | ||
1699 | static int mce_shutdown(struct sys_device *dev) | |
1700 | { | |
5e09954a | 1701 | return mce_disable_error_reporting(); |
973a2dd1 AK |
1702 | } |
1703 | ||
e9eee03e IM |
1704 | /* |
1705 | * On resume clear all MCE state. Don't want to see leftovers from the BIOS. | |
1706 | * Only one CPU is active at this time, the others get re-added later using | |
1707 | * CPU hotplug: | |
1708 | */ | |
1da177e4 LT |
1709 | static int mce_resume(struct sys_device *dev) |
1710 | { | |
5e09954a BP |
1711 | __mcheck_cpu_init_generic(); |
1712 | __mcheck_cpu_init_vendor(¤t_cpu_data); | |
e9eee03e | 1713 | |
1da177e4 LT |
1714 | return 0; |
1715 | } | |
1716 | ||
52d168e2 AK |
1717 | static void mce_cpu_restart(void *data) |
1718 | { | |
1719 | del_timer_sync(&__get_cpu_var(mce_timer)); | |
33edbf02 HS |
1720 | if (!mce_available(¤t_cpu_data)) |
1721 | return; | |
5e09954a BP |
1722 | __mcheck_cpu_init_generic(); |
1723 | __mcheck_cpu_init_timer(); | |
52d168e2 AK |
1724 | } |
1725 | ||
1da177e4 | 1726 | /* Reinit MCEs after user configuration changes */ |
d88203d1 TG |
1727 | static void mce_restart(void) |
1728 | { | |
52d168e2 | 1729 | on_each_cpu(mce_cpu_restart, NULL, 1); |
1da177e4 LT |
1730 | } |
1731 | ||
9af43b54 HS |
1732 | /* Toggle features for corrected errors */ |
1733 | static void mce_disable_ce(void *all) | |
1734 | { | |
1735 | if (!mce_available(¤t_cpu_data)) | |
1736 | return; | |
1737 | if (all) | |
1738 | del_timer_sync(&__get_cpu_var(mce_timer)); | |
1739 | cmci_clear(); | |
1740 | } | |
1741 | ||
1742 | static void mce_enable_ce(void *all) | |
1743 | { | |
1744 | if (!mce_available(¤t_cpu_data)) | |
1745 | return; | |
1746 | cmci_reenable(); | |
1747 | cmci_recheck(); | |
1748 | if (all) | |
5e09954a | 1749 | __mcheck_cpu_init_timer(); |
9af43b54 HS |
1750 | } |
1751 | ||
1da177e4 | 1752 | static struct sysdev_class mce_sysclass = { |
e9eee03e IM |
1753 | .suspend = mce_suspend, |
1754 | .shutdown = mce_shutdown, | |
1755 | .resume = mce_resume, | |
1756 | .name = "machinecheck", | |
1da177e4 LT |
1757 | }; |
1758 | ||
cb491fca | 1759 | DEFINE_PER_CPU(struct sys_device, mce_dev); |
e9eee03e IM |
1760 | |
1761 | __cpuinitdata | |
1762 | void (*threshold_cpu_callback)(unsigned long action, unsigned int cpu); | |
1da177e4 | 1763 | |
cebe1820 AK |
1764 | static inline struct mce_bank *attr_to_bank(struct sysdev_attribute *attr) |
1765 | { | |
1766 | return container_of(attr, struct mce_bank, attr); | |
1767 | } | |
0d7482e3 AK |
1768 | |
1769 | static ssize_t show_bank(struct sys_device *s, struct sysdev_attribute *attr, | |
1770 | char *buf) | |
1771 | { | |
cebe1820 | 1772 | return sprintf(buf, "%llx\n", attr_to_bank(attr)->ctl); |
0d7482e3 AK |
1773 | } |
1774 | ||
1775 | static ssize_t set_bank(struct sys_device *s, struct sysdev_attribute *attr, | |
9319cec8 | 1776 | const char *buf, size_t size) |
0d7482e3 | 1777 | { |
9319cec8 | 1778 | u64 new; |
e9eee03e | 1779 | |
9319cec8 | 1780 | if (strict_strtoull(buf, 0, &new) < 0) |
0d7482e3 | 1781 | return -EINVAL; |
e9eee03e | 1782 | |
cebe1820 | 1783 | attr_to_bank(attr)->ctl = new; |
0d7482e3 | 1784 | mce_restart(); |
e9eee03e | 1785 | |
9319cec8 | 1786 | return size; |
0d7482e3 | 1787 | } |
a98f0dd3 | 1788 | |
e9eee03e IM |
1789 | static ssize_t |
1790 | show_trigger(struct sys_device *s, struct sysdev_attribute *attr, char *buf) | |
a98f0dd3 | 1791 | { |
1020bcbc | 1792 | strcpy(buf, mce_helper); |
a98f0dd3 | 1793 | strcat(buf, "\n"); |
1020bcbc | 1794 | return strlen(mce_helper) + 1; |
a98f0dd3 AK |
1795 | } |
1796 | ||
4a0b2b4d | 1797 | static ssize_t set_trigger(struct sys_device *s, struct sysdev_attribute *attr, |
e9eee03e | 1798 | const char *buf, size_t siz) |
a98f0dd3 AK |
1799 | { |
1800 | char *p; | |
e9eee03e | 1801 | |
1020bcbc HS |
1802 | strncpy(mce_helper, buf, sizeof(mce_helper)); |
1803 | mce_helper[sizeof(mce_helper)-1] = 0; | |
1020bcbc | 1804 | p = strchr(mce_helper, '\n'); |
e9eee03e | 1805 | |
e9084ec9 | 1806 | if (p) |
e9eee03e IM |
1807 | *p = 0; |
1808 | ||
e9084ec9 | 1809 | return strlen(mce_helper) + !!p; |
a98f0dd3 AK |
1810 | } |
1811 | ||
9af43b54 HS |
1812 | static ssize_t set_ignore_ce(struct sys_device *s, |
1813 | struct sysdev_attribute *attr, | |
1814 | const char *buf, size_t size) | |
1815 | { | |
1816 | u64 new; | |
1817 | ||
1818 | if (strict_strtoull(buf, 0, &new) < 0) | |
1819 | return -EINVAL; | |
1820 | ||
1821 | if (mce_ignore_ce ^ !!new) { | |
1822 | if (new) { | |
1823 | /* disable ce features */ | |
1824 | on_each_cpu(mce_disable_ce, (void *)1, 1); | |
1825 | mce_ignore_ce = 1; | |
1826 | } else { | |
1827 | /* enable ce features */ | |
1828 | mce_ignore_ce = 0; | |
1829 | on_each_cpu(mce_enable_ce, (void *)1, 1); | |
1830 | } | |
1831 | } | |
1832 | return size; | |
1833 | } | |
1834 | ||
1835 | static ssize_t set_cmci_disabled(struct sys_device *s, | |
1836 | struct sysdev_attribute *attr, | |
1837 | const char *buf, size_t size) | |
1838 | { | |
1839 | u64 new; | |
1840 | ||
1841 | if (strict_strtoull(buf, 0, &new) < 0) | |
1842 | return -EINVAL; | |
1843 | ||
1844 | if (mce_cmci_disabled ^ !!new) { | |
1845 | if (new) { | |
1846 | /* disable cmci */ | |
1847 | on_each_cpu(mce_disable_ce, NULL, 1); | |
1848 | mce_cmci_disabled = 1; | |
1849 | } else { | |
1850 | /* enable cmci */ | |
1851 | mce_cmci_disabled = 0; | |
1852 | on_each_cpu(mce_enable_ce, NULL, 1); | |
1853 | } | |
1854 | } | |
1855 | return size; | |
1856 | } | |
1857 | ||
b56f642d AK |
1858 | static ssize_t store_int_with_restart(struct sys_device *s, |
1859 | struct sysdev_attribute *attr, | |
1860 | const char *buf, size_t size) | |
1861 | { | |
1862 | ssize_t ret = sysdev_store_int(s, attr, buf, size); | |
1863 | mce_restart(); | |
1864 | return ret; | |
1865 | } | |
1866 | ||
a98f0dd3 | 1867 | static SYSDEV_ATTR(trigger, 0644, show_trigger, set_trigger); |
d95d62c0 | 1868 | static SYSDEV_INT_ATTR(tolerant, 0644, tolerant); |
3c079792 | 1869 | static SYSDEV_INT_ATTR(monarch_timeout, 0644, monarch_timeout); |
9af43b54 | 1870 | static SYSDEV_INT_ATTR(dont_log_ce, 0644, mce_dont_log_ce); |
e9eee03e | 1871 | |
b56f642d AK |
1872 | static struct sysdev_ext_attribute attr_check_interval = { |
1873 | _SYSDEV_ATTR(check_interval, 0644, sysdev_show_int, | |
1874 | store_int_with_restart), | |
1875 | &check_interval | |
1876 | }; | |
e9eee03e | 1877 | |
9af43b54 HS |
1878 | static struct sysdev_ext_attribute attr_ignore_ce = { |
1879 | _SYSDEV_ATTR(ignore_ce, 0644, sysdev_show_int, set_ignore_ce), | |
1880 | &mce_ignore_ce | |
1881 | }; | |
1882 | ||
1883 | static struct sysdev_ext_attribute attr_cmci_disabled = { | |
74b602c7 | 1884 | _SYSDEV_ATTR(cmci_disabled, 0644, sysdev_show_int, set_cmci_disabled), |
9af43b54 HS |
1885 | &mce_cmci_disabled |
1886 | }; | |
1887 | ||
cb491fca | 1888 | static struct sysdev_attribute *mce_attrs[] = { |
9af43b54 HS |
1889 | &attr_tolerant.attr, |
1890 | &attr_check_interval.attr, | |
1891 | &attr_trigger, | |
3c079792 | 1892 | &attr_monarch_timeout.attr, |
9af43b54 HS |
1893 | &attr_dont_log_ce.attr, |
1894 | &attr_ignore_ce.attr, | |
1895 | &attr_cmci_disabled.attr, | |
a98f0dd3 AK |
1896 | NULL |
1897 | }; | |
1da177e4 | 1898 | |
cb491fca | 1899 | static cpumask_var_t mce_dev_initialized; |
bae19fe0 | 1900 | |
e9eee03e | 1901 | /* Per cpu sysdev init. All of the cpus still share the same ctrl bank: */ |
91c6d400 | 1902 | static __cpuinit int mce_create_device(unsigned int cpu) |
1da177e4 LT |
1903 | { |
1904 | int err; | |
b1f49f95 | 1905 | int i, j; |
92cb7612 | 1906 | |
90367556 | 1907 | if (!mce_available(&boot_cpu_data)) |
91c6d400 AK |
1908 | return -EIO; |
1909 | ||
cb491fca IM |
1910 | memset(&per_cpu(mce_dev, cpu).kobj, 0, sizeof(struct kobject)); |
1911 | per_cpu(mce_dev, cpu).id = cpu; | |
1912 | per_cpu(mce_dev, cpu).cls = &mce_sysclass; | |
91c6d400 | 1913 | |
cb491fca | 1914 | err = sysdev_register(&per_cpu(mce_dev, cpu)); |
d435d862 AM |
1915 | if (err) |
1916 | return err; | |
1917 | ||
cb491fca IM |
1918 | for (i = 0; mce_attrs[i]; i++) { |
1919 | err = sysdev_create_file(&per_cpu(mce_dev, cpu), mce_attrs[i]); | |
d435d862 AM |
1920 | if (err) |
1921 | goto error; | |
1922 | } | |
b1f49f95 | 1923 | for (j = 0; j < banks; j++) { |
cb491fca | 1924 | err = sysdev_create_file(&per_cpu(mce_dev, cpu), |
cebe1820 | 1925 | &mce_banks[j].attr); |
0d7482e3 AK |
1926 | if (err) |
1927 | goto error2; | |
1928 | } | |
cb491fca | 1929 | cpumask_set_cpu(cpu, mce_dev_initialized); |
91c6d400 | 1930 | |
d435d862 | 1931 | return 0; |
0d7482e3 | 1932 | error2: |
b1f49f95 | 1933 | while (--j >= 0) |
cebe1820 | 1934 | sysdev_remove_file(&per_cpu(mce_dev, cpu), &mce_banks[j].attr); |
d435d862 | 1935 | error: |
cb491fca | 1936 | while (--i >= 0) |
5c0e9f28 | 1937 | sysdev_remove_file(&per_cpu(mce_dev, cpu), mce_attrs[i]); |
cb491fca IM |
1938 | |
1939 | sysdev_unregister(&per_cpu(mce_dev, cpu)); | |
d435d862 | 1940 | |
91c6d400 AK |
1941 | return err; |
1942 | } | |
1943 | ||
2d9cd6c2 | 1944 | static __cpuinit void mce_remove_device(unsigned int cpu) |
91c6d400 | 1945 | { |
73ca5358 SL |
1946 | int i; |
1947 | ||
cb491fca | 1948 | if (!cpumask_test_cpu(cpu, mce_dev_initialized)) |
bae19fe0 AH |
1949 | return; |
1950 | ||
cb491fca IM |
1951 | for (i = 0; mce_attrs[i]; i++) |
1952 | sysdev_remove_file(&per_cpu(mce_dev, cpu), mce_attrs[i]); | |
1953 | ||
0d7482e3 | 1954 | for (i = 0; i < banks; i++) |
cebe1820 | 1955 | sysdev_remove_file(&per_cpu(mce_dev, cpu), &mce_banks[i].attr); |
cb491fca IM |
1956 | |
1957 | sysdev_unregister(&per_cpu(mce_dev, cpu)); | |
1958 | cpumask_clear_cpu(cpu, mce_dev_initialized); | |
91c6d400 | 1959 | } |
91c6d400 | 1960 | |
d6b75584 | 1961 | /* Make sure there are no machine checks on offlined CPUs. */ |
767df1bd | 1962 | static void __cpuinit mce_disable_cpu(void *h) |
d6b75584 | 1963 | { |
88ccbedd | 1964 | unsigned long action = *(unsigned long *)h; |
cb491fca | 1965 | int i; |
d6b75584 AK |
1966 | |
1967 | if (!mce_available(¤t_cpu_data)) | |
1968 | return; | |
767df1bd | 1969 | |
88ccbedd AK |
1970 | if (!(action & CPU_TASKS_FROZEN)) |
1971 | cmci_clear(); | |
06b7a7a5 | 1972 | for (i = 0; i < banks; i++) { |
cebe1820 | 1973 | struct mce_bank *b = &mce_banks[i]; |
11868a2d | 1974 | |
cebe1820 | 1975 | if (b->init) |
a2d32bcb | 1976 | wrmsrl(MSR_IA32_MCx_CTL(i), 0); |
06b7a7a5 | 1977 | } |
d6b75584 AK |
1978 | } |
1979 | ||
767df1bd | 1980 | static void __cpuinit mce_reenable_cpu(void *h) |
d6b75584 | 1981 | { |
88ccbedd | 1982 | unsigned long action = *(unsigned long *)h; |
e9eee03e | 1983 | int i; |
d6b75584 AK |
1984 | |
1985 | if (!mce_available(¤t_cpu_data)) | |
1986 | return; | |
e9eee03e | 1987 | |
88ccbedd AK |
1988 | if (!(action & CPU_TASKS_FROZEN)) |
1989 | cmci_reenable(); | |
06b7a7a5 | 1990 | for (i = 0; i < banks; i++) { |
cebe1820 | 1991 | struct mce_bank *b = &mce_banks[i]; |
11868a2d | 1992 | |
cebe1820 | 1993 | if (b->init) |
a2d32bcb | 1994 | wrmsrl(MSR_IA32_MCx_CTL(i), b->ctl); |
06b7a7a5 | 1995 | } |
d6b75584 AK |
1996 | } |
1997 | ||
91c6d400 | 1998 | /* Get notified when a cpu comes on/off. Be hotplug friendly. */ |
e9eee03e IM |
1999 | static int __cpuinit |
2000 | mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) | |
91c6d400 AK |
2001 | { |
2002 | unsigned int cpu = (unsigned long)hcpu; | |
52d168e2 | 2003 | struct timer_list *t = &per_cpu(mce_timer, cpu); |
91c6d400 AK |
2004 | |
2005 | switch (action) { | |
bae19fe0 AH |
2006 | case CPU_ONLINE: |
2007 | case CPU_ONLINE_FROZEN: | |
2008 | mce_create_device(cpu); | |
8735728e RW |
2009 | if (threshold_cpu_callback) |
2010 | threshold_cpu_callback(action, cpu); | |
91c6d400 | 2011 | break; |
91c6d400 | 2012 | case CPU_DEAD: |
8bb78442 | 2013 | case CPU_DEAD_FROZEN: |
8735728e RW |
2014 | if (threshold_cpu_callback) |
2015 | threshold_cpu_callback(action, cpu); | |
91c6d400 AK |
2016 | mce_remove_device(cpu); |
2017 | break; | |
52d168e2 AK |
2018 | case CPU_DOWN_PREPARE: |
2019 | case CPU_DOWN_PREPARE_FROZEN: | |
2020 | del_timer_sync(t); | |
88ccbedd | 2021 | smp_call_function_single(cpu, mce_disable_cpu, &action, 1); |
52d168e2 AK |
2022 | break; |
2023 | case CPU_DOWN_FAILED: | |
2024 | case CPU_DOWN_FAILED_FROZEN: | |
fe5ed91d HS |
2025 | if (!mce_ignore_ce && check_interval) { |
2026 | t->expires = round_jiffies(jiffies + | |
245b2e70 | 2027 | __get_cpu_var(mce_next_interval)); |
fe5ed91d HS |
2028 | add_timer_on(t, cpu); |
2029 | } | |
88ccbedd AK |
2030 | smp_call_function_single(cpu, mce_reenable_cpu, &action, 1); |
2031 | break; | |
2032 | case CPU_POST_DEAD: | |
2033 | /* intentionally ignoring frozen here */ | |
2034 | cmci_rediscover(cpu); | |
52d168e2 | 2035 | break; |
91c6d400 | 2036 | } |
bae19fe0 | 2037 | return NOTIFY_OK; |
91c6d400 AK |
2038 | } |
2039 | ||
1e35669d | 2040 | static struct notifier_block mce_cpu_notifier __cpuinitdata = { |
91c6d400 AK |
2041 | .notifier_call = mce_cpu_callback, |
2042 | }; | |
2043 | ||
cebe1820 | 2044 | static __init void mce_init_banks(void) |
0d7482e3 AK |
2045 | { |
2046 | int i; | |
2047 | ||
0d7482e3 | 2048 | for (i = 0; i < banks; i++) { |
cebe1820 AK |
2049 | struct mce_bank *b = &mce_banks[i]; |
2050 | struct sysdev_attribute *a = &b->attr; | |
e9eee03e | 2051 | |
a07e4156 | 2052 | sysfs_attr_init(&a->attr); |
cebe1820 AK |
2053 | a->attr.name = b->attrname; |
2054 | snprintf(b->attrname, ATTR_LEN, "bank%d", i); | |
e9eee03e IM |
2055 | |
2056 | a->attr.mode = 0644; | |
2057 | a->show = show_bank; | |
2058 | a->store = set_bank; | |
0d7482e3 | 2059 | } |
0d7482e3 AK |
2060 | } |
2061 | ||
5e09954a | 2062 | static __init int mcheck_init_device(void) |
91c6d400 AK |
2063 | { |
2064 | int err; | |
2065 | int i = 0; | |
2066 | ||
1da177e4 LT |
2067 | if (!mce_available(&boot_cpu_data)) |
2068 | return -EIO; | |
0d7482e3 | 2069 | |
e92fae06 | 2070 | zalloc_cpumask_var(&mce_dev_initialized, GFP_KERNEL); |
996867d0 | 2071 | |
cebe1820 | 2072 | mce_init_banks(); |
0d7482e3 | 2073 | |
1da177e4 | 2074 | err = sysdev_class_register(&mce_sysclass); |
d435d862 AM |
2075 | if (err) |
2076 | return err; | |
91c6d400 AK |
2077 | |
2078 | for_each_online_cpu(i) { | |
d435d862 AM |
2079 | err = mce_create_device(i); |
2080 | if (err) | |
2081 | return err; | |
91c6d400 AK |
2082 | } |
2083 | ||
be6b5a35 | 2084 | register_hotcpu_notifier(&mce_cpu_notifier); |
1da177e4 | 2085 | misc_register(&mce_log_device); |
e9eee03e | 2086 | |
1da177e4 | 2087 | return err; |
1da177e4 | 2088 | } |
91c6d400 | 2089 | |
5e09954a | 2090 | device_initcall(mcheck_init_device); |
a988d334 | 2091 | |
d7c3c9a6 AK |
2092 | /* |
2093 | * Old style boot options parsing. Only for compatibility. | |
2094 | */ | |
2095 | static int __init mcheck_disable(char *str) | |
2096 | { | |
2097 | mce_disabled = 1; | |
2098 | return 1; | |
2099 | } | |
2100 | __setup("nomce", mcheck_disable); | |
a988d334 | 2101 | |
5be9ed25 HY |
2102 | #ifdef CONFIG_DEBUG_FS |
2103 | struct dentry *mce_get_debugfs_dir(void) | |
a988d334 | 2104 | { |
5be9ed25 | 2105 | static struct dentry *dmce; |
a988d334 | 2106 | |
5be9ed25 HY |
2107 | if (!dmce) |
2108 | dmce = debugfs_create_dir("mce", NULL); | |
a988d334 | 2109 | |
5be9ed25 HY |
2110 | return dmce; |
2111 | } | |
a988d334 | 2112 | |
bf783f9f HY |
2113 | static void mce_reset(void) |
2114 | { | |
2115 | cpu_missing = 0; | |
2116 | atomic_set(&mce_fake_paniced, 0); | |
2117 | atomic_set(&mce_executing, 0); | |
2118 | atomic_set(&mce_callin, 0); | |
2119 | atomic_set(&global_nwo, 0); | |
2120 | } | |
a988d334 | 2121 | |
bf783f9f HY |
2122 | static int fake_panic_get(void *data, u64 *val) |
2123 | { | |
2124 | *val = fake_panic; | |
2125 | return 0; | |
a988d334 IM |
2126 | } |
2127 | ||
bf783f9f | 2128 | static int fake_panic_set(void *data, u64 val) |
a988d334 | 2129 | { |
bf783f9f HY |
2130 | mce_reset(); |
2131 | fake_panic = val; | |
2132 | return 0; | |
a988d334 | 2133 | } |
a988d334 | 2134 | |
bf783f9f HY |
2135 | DEFINE_SIMPLE_ATTRIBUTE(fake_panic_fops, fake_panic_get, |
2136 | fake_panic_set, "%llu\n"); | |
d7c3c9a6 | 2137 | |
5e09954a | 2138 | static int __init mcheck_debugfs_init(void) |
d7c3c9a6 | 2139 | { |
bf783f9f HY |
2140 | struct dentry *dmce, *ffake_panic; |
2141 | ||
2142 | dmce = mce_get_debugfs_dir(); | |
2143 | if (!dmce) | |
2144 | return -ENOMEM; | |
2145 | ffake_panic = debugfs_create_file("fake_panic", 0444, dmce, NULL, | |
2146 | &fake_panic_fops); | |
2147 | if (!ffake_panic) | |
2148 | return -ENOMEM; | |
2149 | ||
2150 | return 0; | |
d7c3c9a6 | 2151 | } |
5e09954a | 2152 | late_initcall(mcheck_debugfs_init); |
5be9ed25 | 2153 | #endif |