]>
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 | */ |
c767a54b JP |
10 | |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
12 | ||
e9eee03e IM |
13 | #include <linux/thread_info.h> |
14 | #include <linux/capability.h> | |
15 | #include <linux/miscdevice.h> | |
16 | #include <linux/ratelimit.h> | |
17 | #include <linux/kallsyms.h> | |
18 | #include <linux/rcupdate.h> | |
e9eee03e | 19 | #include <linux/kobject.h> |
14a02530 | 20 | #include <linux/uaccess.h> |
e9eee03e IM |
21 | #include <linux/kdebug.h> |
22 | #include <linux/kernel.h> | |
23 | #include <linux/percpu.h> | |
1da177e4 | 24 | #include <linux/string.h> |
8a25a2fd | 25 | #include <linux/device.h> |
f3c6ea1b | 26 | #include <linux/syscore_ops.h> |
3c079792 | 27 | #include <linux/delay.h> |
8c566ef5 | 28 | #include <linux/ctype.h> |
e9eee03e | 29 | #include <linux/sched.h> |
0d7482e3 | 30 | #include <linux/sysfs.h> |
e9eee03e | 31 | #include <linux/types.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
e9eee03e IM |
33 | #include <linux/init.h> |
34 | #include <linux/kmod.h> | |
35 | #include <linux/poll.h> | |
3c079792 | 36 | #include <linux/nmi.h> |
e9eee03e | 37 | #include <linux/cpu.h> |
14a02530 | 38 | #include <linux/smp.h> |
e9eee03e | 39 | #include <linux/fs.h> |
9b1beaf2 | 40 | #include <linux/mm.h> |
5be9ed25 | 41 | #include <linux/debugfs.h> |
b77e70bf | 42 | #include <linux/irq_work.h> |
69c60c88 | 43 | #include <linux/export.h> |
e9eee03e | 44 | |
d88203d1 | 45 | #include <asm/processor.h> |
95927475 | 46 | #include <asm/traps.h> |
375074cc | 47 | #include <asm/tlbflush.h> |
e9eee03e IM |
48 | #include <asm/mce.h> |
49 | #include <asm/msr.h> | |
1da177e4 | 50 | |
bd19a5e6 | 51 | #include "mce-internal.h" |
711c2e48 | 52 | |
93b62c3c | 53 | static DEFINE_MUTEX(mce_chrdev_read_mutex); |
2aa2b50d | 54 | |
9a7783d0 | 55 | #define mce_log_get_idx_check(p) \ |
e90328b8 | 56 | ({ \ |
f78f5b90 PM |
57 | RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held() && \ |
58 | !lockdep_is_held(&mce_chrdev_read_mutex), \ | |
3959df1d | 59 | "suspicious mce_log_get_idx_check() usage"); \ |
e90328b8 PM |
60 | smp_load_acquire(&(p)); \ |
61 | }) | |
f56e8a07 | 62 | |
8968f9d3 HS |
63 | #define CREATE_TRACE_POINTS |
64 | #include <trace/events/mce.h> | |
65 | ||
3f2f0680 | 66 | #define SPINUNIT 100 /* 100ns */ |
3c079792 | 67 | |
01ca79f1 AK |
68 | DEFINE_PER_CPU(unsigned, mce_exception_count); |
69 | ||
1462594b | 70 | struct mce_bank *mce_banks __read_mostly; |
bf80bbd7 | 71 | struct mce_vendor_flags mce_flags __read_mostly; |
cebe1820 | 72 | |
d203f0b8 | 73 | struct mca_config mca_cfg __read_mostly = { |
84c2559d | 74 | .bootlog = -1, |
d203f0b8 BP |
75 | /* |
76 | * Tolerant levels: | |
77 | * 0: always panic on uncorrected errors, log corrected errors | |
78 | * 1: panic or SIGBUS on uncorrected errors, log corrected errors | |
79 | * 2: SIGBUS or log uncorrected errors (if possible), log corr. errors | |
80 | * 3: never panic or SIGBUS, log all errors (for testing only) | |
81 | */ | |
84c2559d BP |
82 | .tolerant = 1, |
83 | .monarch_timeout = -1 | |
d203f0b8 BP |
84 | }; |
85 | ||
1020bcbc HS |
86 | /* User mode helper program triggered by machine check event */ |
87 | static unsigned long mce_need_notify; | |
88 | static char mce_helper[128]; | |
89 | static char *mce_helper_argv[2] = { mce_helper, NULL }; | |
1da177e4 | 90 | |
93b62c3c HS |
91 | static DECLARE_WAIT_QUEUE_HEAD(mce_chrdev_wait); |
92 | ||
3c079792 AK |
93 | static DEFINE_PER_CPU(struct mce, mces_seen); |
94 | static int cpu_missing; | |
95 | ||
0644414e NR |
96 | /* |
97 | * MCA banks polled by the period polling timer for corrected events. | |
98 | * With Intel CMCI, this only has MCA banks which do not support CMCI (if any). | |
99 | */ | |
ee031c31 AK |
100 | DEFINE_PER_CPU(mce_banks_t, mce_poll_banks) = { |
101 | [0 ... BITS_TO_LONGS(MAX_NR_BANKS)-1] = ~0UL | |
102 | }; | |
103 | ||
c3d1fb56 NR |
104 | /* |
105 | * MCA banks controlled through firmware first for corrected errors. | |
106 | * This is a global list of banks for which we won't enable CMCI and we | |
107 | * won't poll. Firmware controls these banks and is responsible for | |
108 | * reporting corrected errors through GHES. Uncorrected/recoverable | |
109 | * errors are still notified through a machine check. | |
110 | */ | |
111 | mce_banks_t mce_banks_ce_disabled; | |
112 | ||
061120ae CG |
113 | static struct work_struct mce_work; |
114 | static struct irq_work mce_irq_work; | |
9b1beaf2 | 115 | |
61b0fccd | 116 | static void (*quirk_no_way_out)(int bank, struct mce *m, struct pt_regs *regs); |
fd4cf79f | 117 | static int mce_usable_address(struct mce *m); |
61b0fccd | 118 | |
3653ada5 BP |
119 | /* |
120 | * CPU/chipset specific EDAC code can register a notifier call here to print | |
121 | * MCE errors in a human-readable form. | |
122 | */ | |
648ed940 | 123 | ATOMIC_NOTIFIER_HEAD(x86_mce_decoder_chain); |
3653ada5 | 124 | |
b5f2fa4e AK |
125 | /* Do initial initialization of a struct mce */ |
126 | void mce_setup(struct mce *m) | |
127 | { | |
128 | memset(m, 0, sizeof(struct mce)); | |
d620c67f | 129 | m->cpu = m->extcpu = smp_processor_id(); |
4ea1636b | 130 | m->tsc = rdtsc(); |
8ee08347 AK |
131 | /* We hope get_seconds stays lockless */ |
132 | m->time = get_seconds(); | |
133 | m->cpuvendor = boot_cpu_data.x86_vendor; | |
134 | m->cpuid = cpuid_eax(1); | |
8ee08347 | 135 | m->socketid = cpu_data(m->extcpu).phys_proc_id; |
8ee08347 AK |
136 | m->apicid = cpu_data(m->extcpu).initial_apicid; |
137 | rdmsrl(MSR_IA32_MCG_CAP, m->mcgcap); | |
b5f2fa4e AK |
138 | } |
139 | ||
ea149b36 AK |
140 | DEFINE_PER_CPU(struct mce, injectm); |
141 | EXPORT_PER_CPU_SYMBOL_GPL(injectm); | |
142 | ||
1da177e4 LT |
143 | /* |
144 | * Lockless MCE logging infrastructure. | |
145 | * This avoids deadlocks on printk locks without having to break locks. Also | |
146 | * separate MCEs from kernel messages to avoid bogus bug reports. | |
147 | */ | |
148 | ||
231fd906 | 149 | static struct mce_log mcelog = { |
f6fb0ac0 AK |
150 | .signature = MCE_LOG_SIGNATURE, |
151 | .len = MCE_LOG_LEN, | |
152 | .recordlen = sizeof(struct mce), | |
d88203d1 | 153 | }; |
1da177e4 LT |
154 | |
155 | void mce_log(struct mce *mce) | |
156 | { | |
157 | unsigned next, entry; | |
e9eee03e | 158 | |
8968f9d3 HS |
159 | /* Emit the trace record: */ |
160 | trace_mce_record(mce); | |
161 | ||
f29a7aff CG |
162 | if (!mce_gen_pool_add(mce)) |
163 | irq_work_queue(&mce_irq_work); | |
f0cb5452 | 164 | |
1da177e4 | 165 | mce->finished = 0; |
7644143c | 166 | wmb(); |
1da177e4 | 167 | for (;;) { |
9a7783d0 | 168 | entry = mce_log_get_idx_check(mcelog.next); |
673242c1 | 169 | for (;;) { |
696e409d | 170 | |
e9eee03e IM |
171 | /* |
172 | * When the buffer fills up discard new entries. | |
173 | * Assume that the earlier errors are the more | |
174 | * interesting ones: | |
175 | */ | |
673242c1 | 176 | if (entry >= MCE_LOG_LEN) { |
14a02530 HS |
177 | set_bit(MCE_OVERFLOW, |
178 | (unsigned long *)&mcelog.flags); | |
673242c1 AK |
179 | return; |
180 | } | |
e9eee03e | 181 | /* Old left over entry. Skip: */ |
673242c1 AK |
182 | if (mcelog.entry[entry].finished) { |
183 | entry++; | |
184 | continue; | |
185 | } | |
7644143c | 186 | break; |
1da177e4 | 187 | } |
1da177e4 LT |
188 | smp_rmb(); |
189 | next = entry + 1; | |
190 | if (cmpxchg(&mcelog.next, entry, next) == entry) | |
191 | break; | |
192 | } | |
193 | memcpy(mcelog.entry + entry, mce, sizeof(struct mce)); | |
7644143c | 194 | wmb(); |
1da177e4 | 195 | mcelog.entry[entry].finished = 1; |
7644143c | 196 | wmb(); |
1da177e4 | 197 | |
a0189c70 | 198 | mce->finished = 1; |
1020bcbc | 199 | set_bit(0, &mce_need_notify); |
1da177e4 LT |
200 | } |
201 | ||
a79da384 | 202 | void mce_inject_log(struct mce *m) |
09371957 | 203 | { |
a79da384 BP |
204 | mutex_lock(&mce_chrdev_read_mutex); |
205 | mce_log(m); | |
206 | mutex_unlock(&mce_chrdev_read_mutex); | |
09371957 | 207 | } |
a79da384 | 208 | EXPORT_SYMBOL_GPL(mce_inject_log); |
09371957 | 209 | |
fd4cf79f | 210 | static struct notifier_block mce_srao_nb; |
09371957 | 211 | |
3653ada5 BP |
212 | void mce_register_decode_chain(struct notifier_block *nb) |
213 | { | |
fd4cf79f CG |
214 | /* Ensure SRAO notifier has the highest priority in the decode chain. */ |
215 | if (nb != &mce_srao_nb && nb->priority == INT_MAX) | |
216 | nb->priority -= 1; | |
217 | ||
3653ada5 BP |
218 | atomic_notifier_chain_register(&x86_mce_decoder_chain, nb); |
219 | } | |
220 | EXPORT_SYMBOL_GPL(mce_register_decode_chain); | |
221 | ||
222 | void mce_unregister_decode_chain(struct notifier_block *nb) | |
223 | { | |
224 | atomic_notifier_chain_unregister(&x86_mce_decoder_chain, nb); | |
225 | } | |
226 | EXPORT_SYMBOL_GPL(mce_unregister_decode_chain); | |
227 | ||
77e26cca | 228 | static void print_mce(struct mce *m) |
1da177e4 | 229 | { |
dffa4b2f BP |
230 | int ret = 0; |
231 | ||
a2d7b0d4 | 232 | pr_emerg(HW_ERR "CPU %d: Machine Check Exception: %Lx Bank %d: %016Lx\n", |
d620c67f | 233 | m->extcpu, m->mcgstatus, m->bank, m->status); |
f436f8bb | 234 | |
65ea5b03 | 235 | if (m->ip) { |
a2d7b0d4 | 236 | pr_emerg(HW_ERR "RIP%s %02x:<%016Lx> ", |
f436f8bb IM |
237 | !(m->mcgstatus & MCG_STATUS_EIPV) ? " !INEXACT!" : "", |
238 | m->cs, m->ip); | |
239 | ||
1da177e4 | 240 | if (m->cs == __KERNEL_CS) |
65ea5b03 | 241 | print_symbol("{%s}", m->ip); |
f436f8bb | 242 | pr_cont("\n"); |
1da177e4 | 243 | } |
f436f8bb | 244 | |
a2d7b0d4 | 245 | pr_emerg(HW_ERR "TSC %llx ", m->tsc); |
1da177e4 | 246 | if (m->addr) |
f436f8bb | 247 | pr_cont("ADDR %llx ", m->addr); |
1da177e4 | 248 | if (m->misc) |
f436f8bb | 249 | pr_cont("MISC %llx ", m->misc); |
549d042d | 250 | |
f436f8bb | 251 | pr_cont("\n"); |
506ed6b5 AK |
252 | /* |
253 | * Note this output is parsed by external tools and old fields | |
254 | * should not be changed. | |
255 | */ | |
881e23e5 | 256 | pr_emerg(HW_ERR "PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x microcode %x\n", |
506ed6b5 AK |
257 | m->cpuvendor, m->cpuid, m->time, m->socketid, m->apicid, |
258 | cpu_data(m->extcpu).microcode); | |
f436f8bb IM |
259 | |
260 | /* | |
261 | * Print out human-readable details about the MCE error, | |
fb253195 | 262 | * (if the CPU has an implementation for that) |
f436f8bb | 263 | */ |
dffa4b2f BP |
264 | ret = atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, m); |
265 | if (ret == NOTIFY_STOP) | |
266 | return; | |
267 | ||
268 | pr_emerg_ratelimited(HW_ERR "Run the above through 'mcelog --ascii'\n"); | |
86503560 AK |
269 | } |
270 | ||
f94b61c2 AK |
271 | #define PANIC_TIMEOUT 5 /* 5 seconds */ |
272 | ||
c7c9b392 | 273 | static atomic_t mce_panicked; |
f94b61c2 | 274 | |
bf783f9f | 275 | static int fake_panic; |
c7c9b392 | 276 | static atomic_t mce_fake_panicked; |
bf783f9f | 277 | |
f94b61c2 AK |
278 | /* Panic in progress. Enable interrupts and wait for final IPI */ |
279 | static void wait_for_panic(void) | |
280 | { | |
281 | long timeout = PANIC_TIMEOUT*USEC_PER_SEC; | |
f436f8bb | 282 | |
f94b61c2 AK |
283 | preempt_disable(); |
284 | local_irq_enable(); | |
285 | while (timeout-- > 0) | |
286 | udelay(1); | |
29b0f591 | 287 | if (panic_timeout == 0) |
7af19e4a | 288 | panic_timeout = mca_cfg.panic_timeout; |
f94b61c2 AK |
289 | panic("Panicing machine check CPU died"); |
290 | } | |
291 | ||
6c80f87e | 292 | static void mce_panic(const char *msg, struct mce *final, char *exp) |
d88203d1 | 293 | { |
482908b4 | 294 | int i, apei_err = 0; |
e02e68d3 | 295 | |
bf783f9f HY |
296 | if (!fake_panic) { |
297 | /* | |
298 | * Make sure only one CPU runs in machine check panic | |
299 | */ | |
c7c9b392 | 300 | if (atomic_inc_return(&mce_panicked) > 1) |
bf783f9f HY |
301 | wait_for_panic(); |
302 | barrier(); | |
f94b61c2 | 303 | |
bf783f9f HY |
304 | bust_spinlocks(1); |
305 | console_verbose(); | |
306 | } else { | |
307 | /* Don't log too much for fake panic */ | |
c7c9b392 | 308 | if (atomic_inc_return(&mce_fake_panicked) > 1) |
bf783f9f HY |
309 | return; |
310 | } | |
a0189c70 | 311 | /* First print corrected ones that are still unlogged */ |
1da177e4 | 312 | for (i = 0; i < MCE_LOG_LEN; i++) { |
a0189c70 | 313 | struct mce *m = &mcelog.entry[i]; |
77e26cca HS |
314 | if (!(m->status & MCI_STATUS_VAL)) |
315 | continue; | |
482908b4 | 316 | if (!(m->status & MCI_STATUS_UC)) { |
77e26cca | 317 | print_mce(m); |
482908b4 HY |
318 | if (!apei_err) |
319 | apei_err = apei_write_mce(m); | |
320 | } | |
a0189c70 AK |
321 | } |
322 | /* Now print uncorrected but with the final one last */ | |
323 | for (i = 0; i < MCE_LOG_LEN; i++) { | |
324 | struct mce *m = &mcelog.entry[i]; | |
325 | if (!(m->status & MCI_STATUS_VAL)) | |
1da177e4 | 326 | continue; |
77e26cca HS |
327 | if (!(m->status & MCI_STATUS_UC)) |
328 | continue; | |
482908b4 | 329 | if (!final || memcmp(m, final, sizeof(struct mce))) { |
77e26cca | 330 | print_mce(m); |
482908b4 HY |
331 | if (!apei_err) |
332 | apei_err = apei_write_mce(m); | |
333 | } | |
1da177e4 | 334 | } |
482908b4 | 335 | if (final) { |
77e26cca | 336 | print_mce(final); |
482908b4 HY |
337 | if (!apei_err) |
338 | apei_err = apei_write_mce(final); | |
339 | } | |
3c079792 | 340 | if (cpu_missing) |
a2d7b0d4 | 341 | pr_emerg(HW_ERR "Some CPUs didn't answer in synchronization\n"); |
bd19a5e6 | 342 | if (exp) |
a2d7b0d4 | 343 | pr_emerg(HW_ERR "Machine check: %s\n", exp); |
bf783f9f HY |
344 | if (!fake_panic) { |
345 | if (panic_timeout == 0) | |
7af19e4a | 346 | panic_timeout = mca_cfg.panic_timeout; |
bf783f9f HY |
347 | panic(msg); |
348 | } else | |
a2d7b0d4 | 349 | pr_emerg(HW_ERR "Fake kernel panic: %s\n", msg); |
d88203d1 | 350 | } |
1da177e4 | 351 | |
ea149b36 AK |
352 | /* Support code for software error injection */ |
353 | ||
354 | static int msr_to_offset(u32 msr) | |
355 | { | |
0a3aee0d | 356 | unsigned bank = __this_cpu_read(injectm.bank); |
f436f8bb | 357 | |
84c2559d | 358 | if (msr == mca_cfg.rip_msr) |
ea149b36 | 359 | return offsetof(struct mce, ip); |
a2d32bcb | 360 | if (msr == MSR_IA32_MCx_STATUS(bank)) |
ea149b36 | 361 | return offsetof(struct mce, status); |
a2d32bcb | 362 | if (msr == MSR_IA32_MCx_ADDR(bank)) |
ea149b36 | 363 | return offsetof(struct mce, addr); |
a2d32bcb | 364 | if (msr == MSR_IA32_MCx_MISC(bank)) |
ea149b36 AK |
365 | return offsetof(struct mce, misc); |
366 | if (msr == MSR_IA32_MCG_STATUS) | |
367 | return offsetof(struct mce, mcgstatus); | |
368 | return -1; | |
369 | } | |
370 | ||
5f8c1a54 AK |
371 | /* MSR access wrappers used for error injection */ |
372 | static u64 mce_rdmsrl(u32 msr) | |
373 | { | |
374 | u64 v; | |
11868a2d | 375 | |
0a3aee0d | 376 | if (__this_cpu_read(injectm.finished)) { |
ea149b36 | 377 | int offset = msr_to_offset(msr); |
11868a2d | 378 | |
ea149b36 AK |
379 | if (offset < 0) |
380 | return 0; | |
89cbc767 | 381 | return *(u64 *)((char *)this_cpu_ptr(&injectm) + offset); |
ea149b36 | 382 | } |
11868a2d IM |
383 | |
384 | if (rdmsrl_safe(msr, &v)) { | |
385 | WARN_ONCE(1, "mce: Unable to read msr %d!\n", msr); | |
386 | /* | |
387 | * Return zero in case the access faulted. This should | |
388 | * not happen normally but can happen if the CPU does | |
389 | * something weird, or if the code is buggy. | |
390 | */ | |
391 | v = 0; | |
392 | } | |
393 | ||
5f8c1a54 AK |
394 | return v; |
395 | } | |
396 | ||
397 | static void mce_wrmsrl(u32 msr, u64 v) | |
398 | { | |
0a3aee0d | 399 | if (__this_cpu_read(injectm.finished)) { |
ea149b36 | 400 | int offset = msr_to_offset(msr); |
11868a2d | 401 | |
ea149b36 | 402 | if (offset >= 0) |
89cbc767 | 403 | *(u64 *)((char *)this_cpu_ptr(&injectm) + offset) = v; |
ea149b36 AK |
404 | return; |
405 | } | |
5f8c1a54 AK |
406 | wrmsrl(msr, v); |
407 | } | |
408 | ||
b8325c5b HS |
409 | /* |
410 | * Collect all global (w.r.t. this processor) status about this machine | |
411 | * check into our "mce" struct so that we can use it later to assess | |
412 | * the severity of the problem as we read per-bank specific details. | |
413 | */ | |
414 | static inline void mce_gather_info(struct mce *m, struct pt_regs *regs) | |
415 | { | |
416 | mce_setup(m); | |
417 | ||
418 | m->mcgstatus = mce_rdmsrl(MSR_IA32_MCG_STATUS); | |
419 | if (regs) { | |
420 | /* | |
421 | * Get the address of the instruction at the time of | |
422 | * the machine check error. | |
423 | */ | |
424 | if (m->mcgstatus & (MCG_STATUS_RIPV|MCG_STATUS_EIPV)) { | |
425 | m->ip = regs->ip; | |
426 | m->cs = regs->cs; | |
a129a7c8 AK |
427 | |
428 | /* | |
429 | * When in VM86 mode make the cs look like ring 3 | |
430 | * always. This is a lie, but it's better than passing | |
431 | * the additional vm86 bit around everywhere. | |
432 | */ | |
433 | if (v8086_mode(regs)) | |
434 | m->cs |= 3; | |
b8325c5b HS |
435 | } |
436 | /* Use accurate RIP reporting if available. */ | |
84c2559d BP |
437 | if (mca_cfg.rip_msr) |
438 | m->ip = mce_rdmsrl(mca_cfg.rip_msr); | |
b8325c5b HS |
439 | } |
440 | } | |
441 | ||
88ccbedd | 442 | int mce_available(struct cpuinfo_x86 *c) |
1da177e4 | 443 | { |
1462594b | 444 | if (mca_cfg.disabled) |
5b4408fd | 445 | return 0; |
3d1712c9 | 446 | return cpu_has(c, X86_FEATURE_MCE) && cpu_has(c, X86_FEATURE_MCA); |
1da177e4 LT |
447 | } |
448 | ||
9b1beaf2 AK |
449 | static void mce_schedule_work(void) |
450 | { | |
fd4cf79f | 451 | if (!mce_gen_pool_empty() && keventd_up()) |
061120ae | 452 | schedule_work(&mce_work); |
9b1beaf2 AK |
453 | } |
454 | ||
b77e70bf | 455 | static void mce_irq_work_cb(struct irq_work *entry) |
ccc3c319 | 456 | { |
9ff36ee9 | 457 | mce_notify_irq(); |
9b1beaf2 | 458 | mce_schedule_work(); |
ccc3c319 | 459 | } |
ccc3c319 AK |
460 | |
461 | static void mce_report_event(struct pt_regs *regs) | |
462 | { | |
463 | if (regs->flags & (X86_VM_MASK|X86_EFLAGS_IF)) { | |
9ff36ee9 | 464 | mce_notify_irq(); |
9b1beaf2 AK |
465 | /* |
466 | * Triggering the work queue here is just an insurance | |
467 | * policy in case the syscall exit notify handler | |
468 | * doesn't run soon enough or ends up running on the | |
469 | * wrong CPU (can happen when audit sleeps) | |
470 | */ | |
471 | mce_schedule_work(); | |
ccc3c319 AK |
472 | return; |
473 | } | |
474 | ||
061120ae | 475 | irq_work_queue(&mce_irq_work); |
ccc3c319 AK |
476 | } |
477 | ||
fd4cf79f CG |
478 | static int srao_decode_notifier(struct notifier_block *nb, unsigned long val, |
479 | void *data) | |
480 | { | |
481 | struct mce *mce = (struct mce *)data; | |
482 | unsigned long pfn; | |
483 | ||
484 | if (!mce) | |
485 | return NOTIFY_DONE; | |
486 | ||
487 | if (mce->usable_addr && (mce->severity == MCE_AO_SEVERITY)) { | |
488 | pfn = mce->addr >> PAGE_SHIFT; | |
489 | memory_failure(pfn, MCE_VECTOR, 0); | |
490 | } | |
491 | ||
492 | return NOTIFY_OK; | |
ccc3c319 | 493 | } |
fd4cf79f CG |
494 | static struct notifier_block mce_srao_nb = { |
495 | .notifier_call = srao_decode_notifier, | |
496 | .priority = INT_MAX, | |
497 | }; | |
ccc3c319 | 498 | |
85f92694 TL |
499 | /* |
500 | * Read ADDR and MISC registers. | |
501 | */ | |
502 | static void mce_read_aux(struct mce *m, int i) | |
503 | { | |
504 | if (m->status & MCI_STATUS_MISCV) | |
505 | m->misc = mce_rdmsrl(MSR_IA32_MCx_MISC(i)); | |
506 | if (m->status & MCI_STATUS_ADDRV) { | |
507 | m->addr = mce_rdmsrl(MSR_IA32_MCx_ADDR(i)); | |
508 | ||
509 | /* | |
510 | * Mask the reported address by the reported granularity. | |
511 | */ | |
1462594b | 512 | if (mca_cfg.ser && (m->status & MCI_STATUS_MISCV)) { |
85f92694 TL |
513 | u8 shift = MCI_MISC_ADDR_LSB(m->misc); |
514 | m->addr >>= shift; | |
515 | m->addr <<= shift; | |
516 | } | |
517 | } | |
518 | } | |
519 | ||
fa92c586 CY |
520 | static bool memory_error(struct mce *m) |
521 | { | |
522 | struct cpuinfo_x86 *c = &boot_cpu_data; | |
523 | ||
524 | if (c->x86_vendor == X86_VENDOR_AMD) { | |
525 | /* | |
526 | * coming soon | |
527 | */ | |
528 | return false; | |
529 | } else if (c->x86_vendor == X86_VENDOR_INTEL) { | |
530 | /* | |
531 | * Intel SDM Volume 3B - 15.9.2 Compound Error Codes | |
532 | * | |
533 | * Bit 7 of the MCACOD field of IA32_MCi_STATUS is used for | |
534 | * indicating a memory error. Bit 8 is used for indicating a | |
535 | * cache hierarchy error. The combination of bit 2 and bit 3 | |
536 | * is used for indicating a `generic' cache hierarchy error | |
537 | * But we can't just blindly check the above bits, because if | |
538 | * bit 11 is set, then it is a bus/interconnect error - and | |
539 | * either way the above bits just gives more detail on what | |
540 | * bus/interconnect error happened. Note that bit 12 can be | |
541 | * ignored, as it's the "filter" bit. | |
542 | */ | |
543 | return (m->status & 0xef80) == BIT(7) || | |
544 | (m->status & 0xef00) == BIT(8) || | |
545 | (m->status & 0xeffc) == 0xc; | |
546 | } | |
547 | ||
548 | return false; | |
549 | } | |
550 | ||
ca84f696 AK |
551 | DEFINE_PER_CPU(unsigned, mce_poll_count); |
552 | ||
d88203d1 | 553 | /* |
b79109c3 AK |
554 | * Poll for corrected events or events that happened before reset. |
555 | * Those are just logged through /dev/mcelog. | |
556 | * | |
557 | * This is executed in standard interrupt context. | |
ed7290d0 AK |
558 | * |
559 | * Note: spec recommends to panic for fatal unsignalled | |
560 | * errors here. However this would be quite problematic -- | |
561 | * we would need to reimplement the Monarch handling and | |
562 | * it would mess up the exclusion between exception handler | |
563 | * and poll hander -- * so we skip this for now. | |
564 | * These cases should not happen anyways, or only when the CPU | |
565 | * is already totally * confused. In this case it's likely it will | |
566 | * not fully execute the machine check handler either. | |
b79109c3 | 567 | */ |
3f2f0680 | 568 | bool machine_check_poll(enum mcp_flags flags, mce_banks_t *b) |
b79109c3 | 569 | { |
3f2f0680 | 570 | bool error_logged = false; |
b79109c3 | 571 | struct mce m; |
fa92c586 | 572 | int severity; |
b79109c3 AK |
573 | int i; |
574 | ||
c6ae41e7 | 575 | this_cpu_inc(mce_poll_count); |
ca84f696 | 576 | |
b8325c5b | 577 | mce_gather_info(&m, NULL); |
b79109c3 | 578 | |
d203f0b8 | 579 | for (i = 0; i < mca_cfg.banks; i++) { |
cebe1820 | 580 | if (!mce_banks[i].ctl || !test_bit(i, *b)) |
b79109c3 AK |
581 | continue; |
582 | ||
583 | m.misc = 0; | |
584 | m.addr = 0; | |
585 | m.bank = i; | |
586 | m.tsc = 0; | |
587 | ||
588 | barrier(); | |
a2d32bcb | 589 | m.status = mce_rdmsrl(MSR_IA32_MCx_STATUS(i)); |
b79109c3 AK |
590 | if (!(m.status & MCI_STATUS_VAL)) |
591 | continue; | |
592 | ||
3f2f0680 | 593 | |
b79109c3 | 594 | /* |
ed7290d0 AK |
595 | * Uncorrected or signalled events are handled by the exception |
596 | * handler when it is enabled, so don't process those here. | |
b79109c3 AK |
597 | * |
598 | * TBD do the same check for MCI_STATUS_EN here? | |
599 | */ | |
ed7290d0 | 600 | if (!(flags & MCP_UC) && |
1462594b | 601 | (m.status & (mca_cfg.ser ? MCI_STATUS_S : MCI_STATUS_UC))) |
b79109c3 AK |
602 | continue; |
603 | ||
85f92694 | 604 | mce_read_aux(&m, i); |
b79109c3 AK |
605 | |
606 | if (!(flags & MCP_TIMESTAMP)) | |
607 | m.tsc = 0; | |
fa92c586 CY |
608 | |
609 | severity = mce_severity(&m, mca_cfg.tolerant, NULL, false); | |
610 | ||
611 | /* | |
612 | * In the cases where we don't have a valid address after all, | |
613 | * do not add it into the ring buffer. | |
614 | */ | |
615 | if (severity == MCE_DEFERRED_SEVERITY && memory_error(&m)) { | |
616 | if (m.status & MCI_STATUS_ADDRV) { | |
fd4cf79f CG |
617 | m.severity = severity; |
618 | m.usable_addr = mce_usable_address(&m); | |
619 | ||
620 | if (!mce_gen_pool_add(&m)) | |
621 | mce_schedule_work(); | |
fa92c586 CY |
622 | } |
623 | } | |
624 | ||
b79109c3 AK |
625 | /* |
626 | * Don't get the IP here because it's unlikely to | |
627 | * have anything to do with the actual error location. | |
628 | */ | |
3f2f0680 BP |
629 | if (!(flags & MCP_DONTLOG) && !mca_cfg.dont_log_ce) { |
630 | error_logged = true; | |
5679af4c | 631 | mce_log(&m); |
3f2f0680 | 632 | } |
b79109c3 AK |
633 | |
634 | /* | |
635 | * Clear state for this bank. | |
636 | */ | |
a2d32bcb | 637 | mce_wrmsrl(MSR_IA32_MCx_STATUS(i), 0); |
b79109c3 AK |
638 | } |
639 | ||
640 | /* | |
641 | * Don't clear MCG_STATUS here because it's only defined for | |
642 | * exceptions. | |
643 | */ | |
88921be3 AK |
644 | |
645 | sync_core(); | |
3f2f0680 BP |
646 | |
647 | return error_logged; | |
b79109c3 | 648 | } |
ea149b36 | 649 | EXPORT_SYMBOL_GPL(machine_check_poll); |
b79109c3 | 650 | |
bd19a5e6 AK |
651 | /* |
652 | * Do a quick check if any of the events requires a panic. | |
653 | * This decides if we keep the events around or clear them. | |
654 | */ | |
61b0fccd TL |
655 | static int mce_no_way_out(struct mce *m, char **msg, unsigned long *validp, |
656 | struct pt_regs *regs) | |
bd19a5e6 | 657 | { |
95022b8c | 658 | int i, ret = 0; |
17fea54b | 659 | char *tmp; |
bd19a5e6 | 660 | |
d203f0b8 | 661 | for (i = 0; i < mca_cfg.banks; i++) { |
a2d32bcb | 662 | m->status = mce_rdmsrl(MSR_IA32_MCx_STATUS(i)); |
61b0fccd | 663 | if (m->status & MCI_STATUS_VAL) { |
95022b8c | 664 | __set_bit(i, validp); |
61b0fccd TL |
665 | if (quirk_no_way_out) |
666 | quirk_no_way_out(i, m, regs); | |
667 | } | |
17fea54b BP |
668 | |
669 | if (mce_severity(m, mca_cfg.tolerant, &tmp, true) >= MCE_PANIC_SEVERITY) { | |
670 | *msg = tmp; | |
95022b8c | 671 | ret = 1; |
17fea54b | 672 | } |
bd19a5e6 | 673 | } |
95022b8c | 674 | return ret; |
bd19a5e6 AK |
675 | } |
676 | ||
3c079792 AK |
677 | /* |
678 | * Variable to establish order between CPUs while scanning. | |
679 | * Each CPU spins initially until executing is equal its number. | |
680 | */ | |
681 | static atomic_t mce_executing; | |
682 | ||
683 | /* | |
684 | * Defines order of CPUs on entry. First CPU becomes Monarch. | |
685 | */ | |
686 | static atomic_t mce_callin; | |
687 | ||
688 | /* | |
689 | * Check if a timeout waiting for other CPUs happened. | |
690 | */ | |
6c80f87e | 691 | static int mce_timed_out(u64 *t, const char *msg) |
3c079792 AK |
692 | { |
693 | /* | |
694 | * The others already did panic for some reason. | |
695 | * Bail out like in a timeout. | |
696 | * rmb() to tell the compiler that system_state | |
697 | * might have been modified by someone else. | |
698 | */ | |
699 | rmb(); | |
c7c9b392 | 700 | if (atomic_read(&mce_panicked)) |
3c079792 | 701 | wait_for_panic(); |
84c2559d | 702 | if (!mca_cfg.monarch_timeout) |
3c079792 AK |
703 | goto out; |
704 | if ((s64)*t < SPINUNIT) { | |
716079f6 | 705 | if (mca_cfg.tolerant <= 1) |
6c80f87e | 706 | mce_panic(msg, NULL, NULL); |
3c079792 AK |
707 | cpu_missing = 1; |
708 | return 1; | |
709 | } | |
710 | *t -= SPINUNIT; | |
711 | out: | |
712 | touch_nmi_watchdog(); | |
713 | return 0; | |
714 | } | |
715 | ||
716 | /* | |
717 | * The Monarch's reign. The Monarch is the CPU who entered | |
718 | * the machine check handler first. It waits for the others to | |
719 | * raise the exception too and then grades them. When any | |
720 | * error is fatal panic. Only then let the others continue. | |
721 | * | |
722 | * The other CPUs entering the MCE handler will be controlled by the | |
723 | * Monarch. They are called Subjects. | |
724 | * | |
725 | * This way we prevent any potential data corruption in a unrecoverable case | |
726 | * and also makes sure always all CPU's errors are examined. | |
727 | * | |
680b6cfd | 728 | * Also this detects the case of a machine check event coming from outer |
3c079792 AK |
729 | * space (not detected by any CPUs) In this case some external agent wants |
730 | * us to shut down, so panic too. | |
731 | * | |
732 | * The other CPUs might still decide to panic if the handler happens | |
733 | * in a unrecoverable place, but in this case the system is in a semi-stable | |
734 | * state and won't corrupt anything by itself. It's ok to let the others | |
735 | * continue for a bit first. | |
736 | * | |
737 | * All the spin loops have timeouts; when a timeout happens a CPU | |
738 | * typically elects itself to be Monarch. | |
739 | */ | |
740 | static void mce_reign(void) | |
741 | { | |
742 | int cpu; | |
743 | struct mce *m = NULL; | |
744 | int global_worst = 0; | |
745 | char *msg = NULL; | |
746 | char *nmsg = NULL; | |
747 | ||
748 | /* | |
749 | * This CPU is the Monarch and the other CPUs have run | |
750 | * through their handlers. | |
751 | * Grade the severity of the errors of all the CPUs. | |
752 | */ | |
753 | for_each_possible_cpu(cpu) { | |
d203f0b8 BP |
754 | int severity = mce_severity(&per_cpu(mces_seen, cpu), |
755 | mca_cfg.tolerant, | |
e3480271 | 756 | &nmsg, true); |
3c079792 AK |
757 | if (severity > global_worst) { |
758 | msg = nmsg; | |
759 | global_worst = severity; | |
760 | m = &per_cpu(mces_seen, cpu); | |
761 | } | |
762 | } | |
763 | ||
764 | /* | |
765 | * Cannot recover? Panic here then. | |
766 | * This dumps all the mces in the log buffer and stops the | |
767 | * other CPUs. | |
768 | */ | |
d203f0b8 | 769 | if (m && global_worst >= MCE_PANIC_SEVERITY && mca_cfg.tolerant < 3) |
8af7043a | 770 | mce_panic("Fatal machine check", m, msg); |
3c079792 AK |
771 | |
772 | /* | |
773 | * For UC somewhere we let the CPU who detects it handle it. | |
774 | * Also must let continue the others, otherwise the handling | |
775 | * CPU could deadlock on a lock. | |
776 | */ | |
777 | ||
778 | /* | |
779 | * No machine check event found. Must be some external | |
780 | * source or one CPU is hung. Panic. | |
781 | */ | |
d203f0b8 | 782 | if (global_worst <= MCE_KEEP_SEVERITY && mca_cfg.tolerant < 3) |
8af7043a | 783 | mce_panic("Fatal machine check from unknown source", NULL, NULL); |
3c079792 AK |
784 | |
785 | /* | |
786 | * Now clear all the mces_seen so that they don't reappear on | |
787 | * the next mce. | |
788 | */ | |
789 | for_each_possible_cpu(cpu) | |
790 | memset(&per_cpu(mces_seen, cpu), 0, sizeof(struct mce)); | |
791 | } | |
792 | ||
793 | static atomic_t global_nwo; | |
794 | ||
795 | /* | |
796 | * Start of Monarch synchronization. This waits until all CPUs have | |
797 | * entered the exception handler and then determines if any of them | |
798 | * saw a fatal event that requires panic. Then it executes them | |
799 | * in the entry order. | |
800 | * TBD double check parallel CPU hotunplug | |
801 | */ | |
7fb06fc9 | 802 | static int mce_start(int *no_way_out) |
3c079792 | 803 | { |
7fb06fc9 | 804 | int order; |
3c079792 | 805 | int cpus = num_online_cpus(); |
84c2559d | 806 | u64 timeout = (u64)mca_cfg.monarch_timeout * NSEC_PER_USEC; |
3c079792 | 807 | |
7fb06fc9 HS |
808 | if (!timeout) |
809 | return -1; | |
3c079792 | 810 | |
7fb06fc9 | 811 | atomic_add(*no_way_out, &global_nwo); |
184e1fdf HY |
812 | /* |
813 | * global_nwo should be updated before mce_callin | |
814 | */ | |
815 | smp_wmb(); | |
a95436e4 | 816 | order = atomic_inc_return(&mce_callin); |
3c079792 AK |
817 | |
818 | /* | |
819 | * Wait for everyone. | |
820 | */ | |
821 | while (atomic_read(&mce_callin) != cpus) { | |
6c80f87e AL |
822 | if (mce_timed_out(&timeout, |
823 | "Timeout: Not all CPUs entered broadcast exception handler")) { | |
3c079792 | 824 | atomic_set(&global_nwo, 0); |
7fb06fc9 | 825 | return -1; |
3c079792 AK |
826 | } |
827 | ndelay(SPINUNIT); | |
828 | } | |
829 | ||
184e1fdf HY |
830 | /* |
831 | * mce_callin should be read before global_nwo | |
832 | */ | |
833 | smp_rmb(); | |
3c079792 | 834 | |
7fb06fc9 HS |
835 | if (order == 1) { |
836 | /* | |
837 | * Monarch: Starts executing now, the others wait. | |
838 | */ | |
3c079792 | 839 | atomic_set(&mce_executing, 1); |
7fb06fc9 HS |
840 | } else { |
841 | /* | |
842 | * Subject: Now start the scanning loop one by one in | |
843 | * the original callin order. | |
844 | * This way when there are any shared banks it will be | |
845 | * only seen by one CPU before cleared, avoiding duplicates. | |
846 | */ | |
847 | while (atomic_read(&mce_executing) < order) { | |
6c80f87e AL |
848 | if (mce_timed_out(&timeout, |
849 | "Timeout: Subject CPUs unable to finish machine check processing")) { | |
7fb06fc9 HS |
850 | atomic_set(&global_nwo, 0); |
851 | return -1; | |
852 | } | |
853 | ndelay(SPINUNIT); | |
854 | } | |
3c079792 AK |
855 | } |
856 | ||
857 | /* | |
7fb06fc9 | 858 | * Cache the global no_way_out state. |
3c079792 | 859 | */ |
7fb06fc9 HS |
860 | *no_way_out = atomic_read(&global_nwo); |
861 | ||
862 | return order; | |
3c079792 AK |
863 | } |
864 | ||
865 | /* | |
866 | * Synchronize between CPUs after main scanning loop. | |
867 | * This invokes the bulk of the Monarch processing. | |
868 | */ | |
869 | static int mce_end(int order) | |
870 | { | |
871 | int ret = -1; | |
84c2559d | 872 | u64 timeout = (u64)mca_cfg.monarch_timeout * NSEC_PER_USEC; |
3c079792 AK |
873 | |
874 | if (!timeout) | |
875 | goto reset; | |
876 | if (order < 0) | |
877 | goto reset; | |
878 | ||
879 | /* | |
880 | * Allow others to run. | |
881 | */ | |
882 | atomic_inc(&mce_executing); | |
883 | ||
884 | if (order == 1) { | |
885 | /* CHECKME: Can this race with a parallel hotplug? */ | |
886 | int cpus = num_online_cpus(); | |
887 | ||
888 | /* | |
889 | * Monarch: Wait for everyone to go through their scanning | |
890 | * loops. | |
891 | */ | |
892 | while (atomic_read(&mce_executing) <= cpus) { | |
6c80f87e AL |
893 | if (mce_timed_out(&timeout, |
894 | "Timeout: Monarch CPU unable to finish machine check processing")) | |
3c079792 AK |
895 | goto reset; |
896 | ndelay(SPINUNIT); | |
897 | } | |
898 | ||
899 | mce_reign(); | |
900 | barrier(); | |
901 | ret = 0; | |
902 | } else { | |
903 | /* | |
904 | * Subject: Wait for Monarch to finish. | |
905 | */ | |
906 | while (atomic_read(&mce_executing) != 0) { | |
6c80f87e AL |
907 | if (mce_timed_out(&timeout, |
908 | "Timeout: Monarch CPU did not finish machine check processing")) | |
3c079792 AK |
909 | goto reset; |
910 | ndelay(SPINUNIT); | |
911 | } | |
912 | ||
913 | /* | |
914 | * Don't reset anything. That's done by the Monarch. | |
915 | */ | |
916 | return 0; | |
917 | } | |
918 | ||
919 | /* | |
920 | * Reset all global state. | |
921 | */ | |
922 | reset: | |
923 | atomic_set(&global_nwo, 0); | |
924 | atomic_set(&mce_callin, 0); | |
925 | barrier(); | |
926 | ||
927 | /* | |
928 | * Let others run again. | |
929 | */ | |
930 | atomic_set(&mce_executing, 0); | |
931 | return ret; | |
932 | } | |
933 | ||
9b1beaf2 AK |
934 | /* |
935 | * Check if the address reported by the CPU is in a format we can parse. | |
936 | * It would be possible to add code for most other cases, but all would | |
937 | * be somewhat complicated (e.g. segment offset would require an instruction | |
0d2eb44f | 938 | * parser). So only support physical addresses up to page granuality for now. |
9b1beaf2 AK |
939 | */ |
940 | static int mce_usable_address(struct mce *m) | |
941 | { | |
942 | if (!(m->status & MCI_STATUS_MISCV) || !(m->status & MCI_STATUS_ADDRV)) | |
943 | return 0; | |
2b90e77e | 944 | if (MCI_MISC_ADDR_LSB(m->misc) > PAGE_SHIFT) |
9b1beaf2 | 945 | return 0; |
2b90e77e | 946 | if (MCI_MISC_ADDR_MODE(m->misc) != MCI_MISC_ADDR_PHYS) |
9b1beaf2 AK |
947 | return 0; |
948 | return 1; | |
949 | } | |
950 | ||
3c079792 AK |
951 | static void mce_clear_state(unsigned long *toclear) |
952 | { | |
953 | int i; | |
954 | ||
d203f0b8 | 955 | for (i = 0; i < mca_cfg.banks; i++) { |
3c079792 | 956 | if (test_bit(i, toclear)) |
a2d32bcb | 957 | mce_wrmsrl(MSR_IA32_MCx_STATUS(i), 0); |
3c079792 AK |
958 | } |
959 | } | |
960 | ||
b79109c3 AK |
961 | /* |
962 | * The actual machine check handler. This only handles real | |
963 | * exceptions when something got corrupted coming in through int 18. | |
964 | * | |
965 | * This is executed in NMI context not subject to normal locking rules. This | |
966 | * implies that most kernel services cannot be safely used. Don't even | |
967 | * think about putting a printk in there! | |
3c079792 AK |
968 | * |
969 | * On Intel systems this is entered on all CPUs in parallel through | |
970 | * MCE broadcast. However some CPUs might be broken beyond repair, | |
971 | * so be always careful when synchronizing with others. | |
1da177e4 | 972 | */ |
e9eee03e | 973 | void do_machine_check(struct pt_regs *regs, long error_code) |
1da177e4 | 974 | { |
1462594b | 975 | struct mca_config *cfg = &mca_cfg; |
3c079792 | 976 | struct mce m, *final; |
1da177e4 | 977 | int i; |
3c079792 AK |
978 | int worst = 0; |
979 | int severity; | |
980 | /* | |
981 | * Establish sequential order between the CPUs entering the machine | |
982 | * check handler. | |
983 | */ | |
7fb06fc9 | 984 | int order; |
bd78432c TH |
985 | /* |
986 | * If no_way_out gets set, there is no safe way to recover from this | |
d203f0b8 | 987 | * MCE. If mca_cfg.tolerant is cranked up, we'll try anyway. |
bd78432c TH |
988 | */ |
989 | int no_way_out = 0; | |
990 | /* | |
991 | * If kill_it gets set, there might be a way to recover from this | |
992 | * error. | |
993 | */ | |
994 | int kill_it = 0; | |
b79109c3 | 995 | DECLARE_BITMAP(toclear, MAX_NR_BANKS); |
95022b8c | 996 | DECLARE_BITMAP(valid_banks, MAX_NR_BANKS); |
bd19a5e6 | 997 | char *msg = "Unknown"; |
d4812e16 TL |
998 | u64 recover_paddr = ~0ull; |
999 | int flags = MF_ACTION_REQUIRED; | |
243d657e | 1000 | int lmce = 0; |
1da177e4 | 1001 | |
8c84014f | 1002 | ist_enter(regs); |
95927475 | 1003 | |
c6ae41e7 | 1004 | this_cpu_inc(mce_exception_count); |
01ca79f1 | 1005 | |
1462594b | 1006 | if (!cfg->banks) |
32561696 | 1007 | goto out; |
1da177e4 | 1008 | |
b8325c5b | 1009 | mce_gather_info(&m, regs); |
b5f2fa4e | 1010 | |
89cbc767 | 1011 | final = this_cpu_ptr(&mces_seen); |
3c079792 AK |
1012 | *final = m; |
1013 | ||
95022b8c | 1014 | memset(valid_banks, 0, sizeof(valid_banks)); |
61b0fccd | 1015 | no_way_out = mce_no_way_out(&m, &msg, valid_banks, regs); |
680b6cfd | 1016 | |
1da177e4 LT |
1017 | barrier(); |
1018 | ||
ed7290d0 | 1019 | /* |
a8c321fb TL |
1020 | * When no restart IP might need to kill or panic. |
1021 | * Assume the worst for now, but if we find the | |
1022 | * severity is MCE_AR_SEVERITY we have other options. | |
ed7290d0 AK |
1023 | */ |
1024 | if (!(m.mcgstatus & MCG_STATUS_RIPV)) | |
1025 | kill_it = 1; | |
1026 | ||
3c079792 | 1027 | /* |
243d657e | 1028 | * Check if this MCE is signaled to only this logical processor |
3c079792 | 1029 | */ |
243d657e AR |
1030 | if (m.mcgstatus & MCG_STATUS_LMCES) |
1031 | lmce = 1; | |
1032 | else { | |
1033 | /* | |
1034 | * Go through all the banks in exclusion of the other CPUs. | |
1035 | * This way we don't report duplicated events on shared banks | |
1036 | * because the first one to see it will clear it. | |
1037 | * If this is a Local MCE, then no need to perform rendezvous. | |
1038 | */ | |
1039 | order = mce_start(&no_way_out); | |
1040 | } | |
1041 | ||
1462594b | 1042 | for (i = 0; i < cfg->banks; i++) { |
b79109c3 | 1043 | __clear_bit(i, toclear); |
95022b8c TL |
1044 | if (!test_bit(i, valid_banks)) |
1045 | continue; | |
cebe1820 | 1046 | if (!mce_banks[i].ctl) |
1da177e4 | 1047 | continue; |
d88203d1 TG |
1048 | |
1049 | m.misc = 0; | |
1da177e4 LT |
1050 | m.addr = 0; |
1051 | m.bank = i; | |
1da177e4 | 1052 | |
a2d32bcb | 1053 | m.status = mce_rdmsrl(MSR_IA32_MCx_STATUS(i)); |
1da177e4 LT |
1054 | if ((m.status & MCI_STATUS_VAL) == 0) |
1055 | continue; | |
1056 | ||
b79109c3 | 1057 | /* |
ed7290d0 AK |
1058 | * Non uncorrected or non signaled errors are handled by |
1059 | * machine_check_poll. Leave them alone, unless this panics. | |
b79109c3 | 1060 | */ |
1462594b | 1061 | if (!(m.status & (cfg->ser ? MCI_STATUS_S : MCI_STATUS_UC)) && |
ed7290d0 | 1062 | !no_way_out) |
b79109c3 AK |
1063 | continue; |
1064 | ||
1065 | /* | |
1066 | * Set taint even when machine check was not enabled. | |
1067 | */ | |
373d4d09 | 1068 | add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE); |
b79109c3 | 1069 | |
e3480271 | 1070 | severity = mce_severity(&m, cfg->tolerant, NULL, true); |
b79109c3 | 1071 | |
ed7290d0 | 1072 | /* |
e3480271 CY |
1073 | * When machine check was for corrected/deferred handler don't |
1074 | * touch, unless we're panicing. | |
ed7290d0 | 1075 | */ |
e3480271 CY |
1076 | if ((severity == MCE_KEEP_SEVERITY || |
1077 | severity == MCE_UCNA_SEVERITY) && !no_way_out) | |
ed7290d0 AK |
1078 | continue; |
1079 | __set_bit(i, toclear); | |
1080 | if (severity == MCE_NO_SEVERITY) { | |
b79109c3 AK |
1081 | /* |
1082 | * Machine check event was not enabled. Clear, but | |
1083 | * ignore. | |
1084 | */ | |
1085 | continue; | |
1da177e4 LT |
1086 | } |
1087 | ||
85f92694 | 1088 | mce_read_aux(&m, i); |
1da177e4 | 1089 | |
fd4cf79f CG |
1090 | /* assuming valid severity level != 0 */ |
1091 | m.severity = severity; | |
1092 | m.usable_addr = mce_usable_address(&m); | |
9b1beaf2 | 1093 | |
b79109c3 | 1094 | mce_log(&m); |
1da177e4 | 1095 | |
3c079792 AK |
1096 | if (severity > worst) { |
1097 | *final = m; | |
1098 | worst = severity; | |
1da177e4 | 1099 | } |
1da177e4 LT |
1100 | } |
1101 | ||
a8c321fb TL |
1102 | /* mce_clear_state will clear *final, save locally for use later */ |
1103 | m = *final; | |
1104 | ||
3c079792 AK |
1105 | if (!no_way_out) |
1106 | mce_clear_state(toclear); | |
1107 | ||
e9eee03e | 1108 | /* |
3c079792 AK |
1109 | * Do most of the synchronization with other CPUs. |
1110 | * When there's any problem use only local no_way_out state. | |
e9eee03e | 1111 | */ |
243d657e AR |
1112 | if (!lmce) { |
1113 | if (mce_end(order) < 0) | |
1114 | no_way_out = worst >= MCE_PANIC_SEVERITY; | |
1115 | } else { | |
1116 | /* | |
1117 | * Local MCE skipped calling mce_reign() | |
1118 | * If we found a fatal error, we need to panic here. | |
1119 | */ | |
1120 | if (worst >= MCE_PANIC_SEVERITY && mca_cfg.tolerant < 3) | |
1121 | mce_panic("Machine check from unknown source", | |
1122 | NULL, NULL); | |
1123 | } | |
bd78432c TH |
1124 | |
1125 | /* | |
a8c321fb TL |
1126 | * At insane "tolerant" levels we take no action. Otherwise |
1127 | * we only die if we have no other choice. For less serious | |
1128 | * issues we try to recover, or limit damage to the current | |
1129 | * process. | |
bd78432c | 1130 | */ |
1462594b | 1131 | if (cfg->tolerant < 3) { |
a8c321fb TL |
1132 | if (no_way_out) |
1133 | mce_panic("Fatal machine check on current CPU", &m, msg); | |
1134 | if (worst == MCE_AR_SEVERITY) { | |
d4812e16 TL |
1135 | recover_paddr = m.addr; |
1136 | if (!(m.mcgstatus & MCG_STATUS_RIPV)) | |
1137 | flags |= MF_MUST_KILL; | |
a8c321fb TL |
1138 | } else if (kill_it) { |
1139 | force_sig(SIGBUS, current); | |
1140 | } | |
1141 | } | |
e02e68d3 | 1142 | |
3c079792 AK |
1143 | if (worst > 0) |
1144 | mce_report_event(regs); | |
5f8c1a54 | 1145 | mce_wrmsrl(MSR_IA32_MCG_STATUS, 0); |
32561696 | 1146 | out: |
88921be3 | 1147 | sync_core(); |
d4812e16 TL |
1148 | |
1149 | if (recover_paddr == ~0ull) | |
1150 | goto done; | |
1151 | ||
1152 | pr_err("Uncorrected hardware memory error in user-access at %llx", | |
1153 | recover_paddr); | |
1154 | /* | |
1155 | * We must call memory_failure() here even if the current process is | |
1156 | * doomed. We still need to mark the page as poisoned and alert any | |
1157 | * other users of the page. | |
1158 | */ | |
1159 | ist_begin_non_atomic(regs); | |
1160 | local_irq_enable(); | |
1161 | if (memory_failure(recover_paddr >> PAGE_SHIFT, MCE_VECTOR, flags) < 0) { | |
1162 | pr_err("Memory error not recovered"); | |
1163 | force_sig(SIGBUS, current); | |
1164 | } | |
1165 | local_irq_disable(); | |
1166 | ist_end_non_atomic(); | |
1167 | done: | |
8c84014f | 1168 | ist_exit(regs); |
1da177e4 | 1169 | } |
ea149b36 | 1170 | EXPORT_SYMBOL_GPL(do_machine_check); |
1da177e4 | 1171 | |
cd42f4a3 TL |
1172 | #ifndef CONFIG_MEMORY_FAILURE |
1173 | int memory_failure(unsigned long pfn, int vector, int flags) | |
9b1beaf2 | 1174 | { |
a8c321fb TL |
1175 | /* mce_severity() should not hand us an ACTION_REQUIRED error */ |
1176 | BUG_ON(flags & MF_ACTION_REQUIRED); | |
c767a54b JP |
1177 | pr_err("Uncorrected memory error in page 0x%lx ignored\n" |
1178 | "Rebuild kernel with CONFIG_MEMORY_FAILURE=y for smarter handling\n", | |
1179 | pfn); | |
cd42f4a3 TL |
1180 | |
1181 | return 0; | |
9b1beaf2 | 1182 | } |
cd42f4a3 | 1183 | #endif |
9b1beaf2 | 1184 | |
a8c321fb TL |
1185 | /* |
1186 | * Action optional processing happens here (picking up | |
1187 | * from the list of faulting pages that do_machine_check() | |
fd4cf79f | 1188 | * placed into the genpool). |
a8c321fb | 1189 | */ |
9b1beaf2 AK |
1190 | static void mce_process_work(struct work_struct *dummy) |
1191 | { | |
fd4cf79f | 1192 | mce_gen_pool_process(); |
9b1beaf2 AK |
1193 | } |
1194 | ||
15d5f839 DZ |
1195 | #ifdef CONFIG_X86_MCE_INTEL |
1196 | /*** | |
1197 | * mce_log_therm_throt_event - Logs the thermal throttling event to mcelog | |
676b1855 | 1198 | * @cpu: The CPU on which the event occurred. |
15d5f839 DZ |
1199 | * @status: Event status information |
1200 | * | |
1201 | * This function should be called by the thermal interrupt after the | |
1202 | * event has been processed and the decision was made to log the event | |
1203 | * further. | |
1204 | * | |
1205 | * The status parameter will be saved to the 'status' field of 'struct mce' | |
1206 | * and historically has been the register value of the | |
1207 | * MSR_IA32_THERMAL_STATUS (Intel) msr. | |
1208 | */ | |
b5f2fa4e | 1209 | void mce_log_therm_throt_event(__u64 status) |
15d5f839 DZ |
1210 | { |
1211 | struct mce m; | |
1212 | ||
b5f2fa4e | 1213 | mce_setup(&m); |
15d5f839 DZ |
1214 | m.bank = MCE_THERMAL_BANK; |
1215 | m.status = status; | |
15d5f839 DZ |
1216 | mce_log(&m); |
1217 | } | |
1218 | #endif /* CONFIG_X86_MCE_INTEL */ | |
1219 | ||
1da177e4 | 1220 | /* |
8a336b0a TH |
1221 | * Periodic polling timer for "silent" machine check errors. If the |
1222 | * poller finds an MCE, poll 2x faster. When the poller finds no more | |
1223 | * errors, poll 2x slower (up to check_interval seconds). | |
1da177e4 | 1224 | */ |
3f2f0680 | 1225 | static unsigned long check_interval = INITIAL_CHECK_INTERVAL; |
e9eee03e | 1226 | |
82f7af09 | 1227 | static DEFINE_PER_CPU(unsigned long, mce_next_interval); /* in jiffies */ |
52d168e2 | 1228 | static DEFINE_PER_CPU(struct timer_list, mce_timer); |
1da177e4 | 1229 | |
55babd8f CG |
1230 | static unsigned long mce_adjust_timer_default(unsigned long interval) |
1231 | { | |
1232 | return interval; | |
1233 | } | |
1234 | ||
3f2f0680 | 1235 | static unsigned long (*mce_adjust_timer)(unsigned long interval) = mce_adjust_timer_default; |
55babd8f | 1236 | |
3f2f0680 | 1237 | static void __restart_timer(struct timer_list *t, unsigned long interval) |
27f6c573 | 1238 | { |
3f2f0680 BP |
1239 | unsigned long when = jiffies + interval; |
1240 | unsigned long flags; | |
27f6c573 | 1241 | |
3f2f0680 | 1242 | local_irq_save(flags); |
27f6c573 | 1243 | |
3f2f0680 BP |
1244 | if (timer_pending(t)) { |
1245 | if (time_before(when, t->expires)) | |
1246 | mod_timer_pinned(t, when); | |
1247 | } else { | |
1248 | t->expires = round_jiffies(when); | |
1249 | add_timer_on(t, smp_processor_id()); | |
1250 | } | |
1251 | ||
1252 | local_irq_restore(flags); | |
27f6c573 CG |
1253 | } |
1254 | ||
82f7af09 | 1255 | static void mce_timer_fn(unsigned long data) |
1da177e4 | 1256 | { |
89cbc767 | 1257 | struct timer_list *t = this_cpu_ptr(&mce_timer); |
3f2f0680 | 1258 | int cpu = smp_processor_id(); |
82f7af09 | 1259 | unsigned long iv; |
52d168e2 | 1260 | |
3f2f0680 BP |
1261 | WARN_ON(cpu != data); |
1262 | ||
1263 | iv = __this_cpu_read(mce_next_interval); | |
52d168e2 | 1264 | |
89cbc767 | 1265 | if (mce_available(this_cpu_ptr(&cpu_info))) { |
3f2f0680 BP |
1266 | machine_check_poll(MCP_TIMESTAMP, this_cpu_ptr(&mce_poll_banks)); |
1267 | ||
1268 | if (mce_intel_cmci_poll()) { | |
1269 | iv = mce_adjust_timer(iv); | |
1270 | goto done; | |
1271 | } | |
e9eee03e | 1272 | } |
1da177e4 LT |
1273 | |
1274 | /* | |
3f2f0680 BP |
1275 | * Alert userspace if needed. If we logged an MCE, reduce the polling |
1276 | * interval, otherwise increase the polling interval. | |
1da177e4 | 1277 | */ |
3f2f0680 | 1278 | if (mce_notify_irq()) |
958fb3c5 | 1279 | iv = max(iv / 2, (unsigned long) HZ/100); |
3f2f0680 | 1280 | else |
82f7af09 | 1281 | iv = min(iv * 2, round_jiffies_relative(check_interval * HZ)); |
3f2f0680 BP |
1282 | |
1283 | done: | |
82f7af09 | 1284 | __this_cpu_write(mce_next_interval, iv); |
3f2f0680 | 1285 | __restart_timer(t, iv); |
55babd8f | 1286 | } |
e02e68d3 | 1287 | |
55babd8f CG |
1288 | /* |
1289 | * Ensure that the timer is firing in @interval from now. | |
1290 | */ | |
1291 | void mce_timer_kick(unsigned long interval) | |
1292 | { | |
89cbc767 | 1293 | struct timer_list *t = this_cpu_ptr(&mce_timer); |
55babd8f CG |
1294 | unsigned long iv = __this_cpu_read(mce_next_interval); |
1295 | ||
3f2f0680 BP |
1296 | __restart_timer(t, interval); |
1297 | ||
55babd8f CG |
1298 | if (interval < iv) |
1299 | __this_cpu_write(mce_next_interval, interval); | |
e02e68d3 TH |
1300 | } |
1301 | ||
9aaef96f HS |
1302 | /* Must not be called in IRQ context where del_timer_sync() can deadlock */ |
1303 | static void mce_timer_delete_all(void) | |
1304 | { | |
1305 | int cpu; | |
1306 | ||
1307 | for_each_online_cpu(cpu) | |
1308 | del_timer_sync(&per_cpu(mce_timer, cpu)); | |
1309 | } | |
1310 | ||
9bd98405 AK |
1311 | static void mce_do_trigger(struct work_struct *work) |
1312 | { | |
1020bcbc | 1313 | call_usermodehelper(mce_helper, mce_helper_argv, NULL, UMH_NO_WAIT); |
9bd98405 AK |
1314 | } |
1315 | ||
1316 | static DECLARE_WORK(mce_trigger_work, mce_do_trigger); | |
1317 | ||
e02e68d3 | 1318 | /* |
9bd98405 AK |
1319 | * Notify the user(s) about new machine check events. |
1320 | * Can be called from interrupt context, but not from machine check/NMI | |
1321 | * context. | |
e02e68d3 | 1322 | */ |
9ff36ee9 | 1323 | int mce_notify_irq(void) |
e02e68d3 | 1324 | { |
8457c84d AK |
1325 | /* Not more than two messages every minute */ |
1326 | static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2); | |
1327 | ||
1020bcbc | 1328 | if (test_and_clear_bit(0, &mce_need_notify)) { |
93b62c3c HS |
1329 | /* wake processes polling /dev/mcelog */ |
1330 | wake_up_interruptible(&mce_chrdev_wait); | |
9bd98405 | 1331 | |
4d899be5 | 1332 | if (mce_helper[0]) |
9bd98405 | 1333 | schedule_work(&mce_trigger_work); |
e02e68d3 | 1334 | |
8457c84d | 1335 | if (__ratelimit(&ratelimit)) |
a2d7b0d4 | 1336 | pr_info(HW_ERR "Machine check events logged\n"); |
e02e68d3 TH |
1337 | |
1338 | return 1; | |
1da177e4 | 1339 | } |
e02e68d3 TH |
1340 | return 0; |
1341 | } | |
9ff36ee9 | 1342 | EXPORT_SYMBOL_GPL(mce_notify_irq); |
8a336b0a | 1343 | |
148f9bb8 | 1344 | static int __mcheck_cpu_mce_banks_init(void) |
cebe1820 AK |
1345 | { |
1346 | int i; | |
d203f0b8 | 1347 | u8 num_banks = mca_cfg.banks; |
cebe1820 | 1348 | |
d203f0b8 | 1349 | mce_banks = kzalloc(num_banks * sizeof(struct mce_bank), GFP_KERNEL); |
cebe1820 AK |
1350 | if (!mce_banks) |
1351 | return -ENOMEM; | |
d203f0b8 BP |
1352 | |
1353 | for (i = 0; i < num_banks; i++) { | |
cebe1820 | 1354 | struct mce_bank *b = &mce_banks[i]; |
11868a2d | 1355 | |
cebe1820 AK |
1356 | b->ctl = -1ULL; |
1357 | b->init = 1; | |
1358 | } | |
1359 | return 0; | |
1360 | } | |
1361 | ||
d88203d1 | 1362 | /* |
1da177e4 LT |
1363 | * Initialize Machine Checks for a CPU. |
1364 | */ | |
148f9bb8 | 1365 | static int __mcheck_cpu_cap_init(void) |
1da177e4 | 1366 | { |
0d7482e3 | 1367 | unsigned b; |
e9eee03e | 1368 | u64 cap; |
1da177e4 LT |
1369 | |
1370 | rdmsrl(MSR_IA32_MCG_CAP, cap); | |
01c6680a TG |
1371 | |
1372 | b = cap & MCG_BANKCNT_MASK; | |
d203f0b8 | 1373 | if (!mca_cfg.banks) |
c767a54b | 1374 | pr_info("CPU supports %d MCE banks\n", b); |
b659294b | 1375 | |
0d7482e3 | 1376 | if (b > MAX_NR_BANKS) { |
c767a54b | 1377 | pr_warn("Using only %u machine check banks out of %u\n", |
0d7482e3 AK |
1378 | MAX_NR_BANKS, b); |
1379 | b = MAX_NR_BANKS; | |
1380 | } | |
1381 | ||
1382 | /* Don't support asymmetric configurations today */ | |
d203f0b8 BP |
1383 | WARN_ON(mca_cfg.banks != 0 && b != mca_cfg.banks); |
1384 | mca_cfg.banks = b; | |
1385 | ||
cebe1820 | 1386 | if (!mce_banks) { |
cffd377e | 1387 | int err = __mcheck_cpu_mce_banks_init(); |
11868a2d | 1388 | |
cebe1820 AK |
1389 | if (err) |
1390 | return err; | |
1da177e4 | 1391 | } |
0d7482e3 | 1392 | |
94ad8474 | 1393 | /* Use accurate RIP reporting if available. */ |
01c6680a | 1394 | if ((cap & MCG_EXT_P) && MCG_EXT_CNT(cap) >= 9) |
84c2559d | 1395 | mca_cfg.rip_msr = MSR_IA32_MCG_EIP; |
1da177e4 | 1396 | |
ed7290d0 | 1397 | if (cap & MCG_SER_P) |
1462594b | 1398 | mca_cfg.ser = true; |
ed7290d0 | 1399 | |
0d7482e3 AK |
1400 | return 0; |
1401 | } | |
1402 | ||
5e09954a | 1403 | static void __mcheck_cpu_init_generic(void) |
0d7482e3 | 1404 | { |
84c2559d | 1405 | enum mcp_flags m_fl = 0; |
e9eee03e | 1406 | mce_banks_t all_banks; |
0d7482e3 AK |
1407 | u64 cap; |
1408 | int i; | |
1409 | ||
84c2559d BP |
1410 | if (!mca_cfg.bootlog) |
1411 | m_fl = MCP_DONTLOG; | |
1412 | ||
b79109c3 AK |
1413 | /* |
1414 | * Log the machine checks left over from the previous reset. | |
1415 | */ | |
ee031c31 | 1416 | bitmap_fill(all_banks, MAX_NR_BANKS); |
84c2559d | 1417 | machine_check_poll(MCP_UC | m_fl, &all_banks); |
1da177e4 | 1418 | |
375074cc | 1419 | cr4_set_bits(X86_CR4_MCE); |
1da177e4 | 1420 | |
0d7482e3 | 1421 | rdmsrl(MSR_IA32_MCG_CAP, cap); |
1da177e4 LT |
1422 | if (cap & MCG_CTL_P) |
1423 | wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff); | |
1424 | ||
d203f0b8 | 1425 | for (i = 0; i < mca_cfg.banks; i++) { |
cebe1820 | 1426 | struct mce_bank *b = &mce_banks[i]; |
11868a2d | 1427 | |
cebe1820 | 1428 | if (!b->init) |
06b7a7a5 | 1429 | continue; |
a2d32bcb AK |
1430 | wrmsrl(MSR_IA32_MCx_CTL(i), b->ctl); |
1431 | wrmsrl(MSR_IA32_MCx_STATUS(i), 0); | |
d88203d1 | 1432 | } |
1da177e4 LT |
1433 | } |
1434 | ||
61b0fccd TL |
1435 | /* |
1436 | * During IFU recovery Sandy Bridge -EP4S processors set the RIPV and | |
1437 | * EIPV bits in MCG_STATUS to zero on the affected logical processor (SDM | |
1438 | * Vol 3B Table 15-20). But this confuses both the code that determines | |
1439 | * whether the machine check occurred in kernel or user mode, and also | |
1440 | * the severity assessment code. Pretend that EIPV was set, and take the | |
1441 | * ip/cs values from the pt_regs that mce_gather_info() ignored earlier. | |
1442 | */ | |
1443 | static void quirk_sandybridge_ifu(int bank, struct mce *m, struct pt_regs *regs) | |
1444 | { | |
1445 | if (bank != 0) | |
1446 | return; | |
1447 | if ((m->mcgstatus & (MCG_STATUS_EIPV|MCG_STATUS_RIPV)) != 0) | |
1448 | return; | |
1449 | if ((m->status & (MCI_STATUS_OVER|MCI_STATUS_UC| | |
1450 | MCI_STATUS_EN|MCI_STATUS_MISCV|MCI_STATUS_ADDRV| | |
1451 | MCI_STATUS_PCC|MCI_STATUS_S|MCI_STATUS_AR| | |
1452 | MCACOD)) != | |
1453 | (MCI_STATUS_UC|MCI_STATUS_EN| | |
1454 | MCI_STATUS_MISCV|MCI_STATUS_ADDRV|MCI_STATUS_S| | |
1455 | MCI_STATUS_AR|MCACOD_INSTR)) | |
1456 | return; | |
1457 | ||
1458 | m->mcgstatus |= MCG_STATUS_EIPV; | |
1459 | m->ip = regs->ip; | |
1460 | m->cs = regs->cs; | |
1461 | } | |
1462 | ||
1da177e4 | 1463 | /* Add per CPU specific workarounds here */ |
148f9bb8 | 1464 | static int __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c) |
d88203d1 | 1465 | { |
d203f0b8 BP |
1466 | struct mca_config *cfg = &mca_cfg; |
1467 | ||
e412cd25 | 1468 | if (c->x86_vendor == X86_VENDOR_UNKNOWN) { |
c767a54b | 1469 | pr_info("unknown CPU type - not enabling MCE support\n"); |
e412cd25 IM |
1470 | return -EOPNOTSUPP; |
1471 | } | |
1472 | ||
1da177e4 | 1473 | /* This should be disabled by the BIOS, but isn't always */ |
911f6a7b | 1474 | if (c->x86_vendor == X86_VENDOR_AMD) { |
d203f0b8 | 1475 | if (c->x86 == 15 && cfg->banks > 4) { |
e9eee03e IM |
1476 | /* |
1477 | * disable GART TBL walk error reporting, which | |
1478 | * trips off incorrectly with the IOMMU & 3ware | |
1479 | * & Cerberus: | |
1480 | */ | |
cebe1820 | 1481 | clear_bit(10, (unsigned long *)&mce_banks[4].ctl); |
e9eee03e | 1482 | } |
84c2559d | 1483 | if (c->x86 <= 17 && cfg->bootlog < 0) { |
e9eee03e IM |
1484 | /* |
1485 | * Lots of broken BIOS around that don't clear them | |
1486 | * by default and leave crap in there. Don't log: | |
1487 | */ | |
84c2559d | 1488 | cfg->bootlog = 0; |
e9eee03e | 1489 | } |
2e6f694f AK |
1490 | /* |
1491 | * Various K7s with broken bank 0 around. Always disable | |
1492 | * by default. | |
1493 | */ | |
c9ce8712 | 1494 | if (c->x86 == 6 && cfg->banks > 0) |
cebe1820 | 1495 | mce_banks[0].ctl = 0; |
575203b4 | 1496 | |
bf80bbd7 AG |
1497 | /* |
1498 | * overflow_recov is supported for F15h Models 00h-0fh | |
1499 | * even though we don't have a CPUID bit for it. | |
1500 | */ | |
1501 | if (c->x86 == 0x15 && c->x86_model <= 0xf) | |
1502 | mce_flags.overflow_recov = 1; | |
1503 | ||
c9ce8712 BP |
1504 | /* |
1505 | * Turn off MC4_MISC thresholding banks on those models since | |
1506 | * they're not supported there. | |
1507 | */ | |
1508 | if (c->x86 == 0x15 && | |
1509 | (c->x86_model >= 0x10 && c->x86_model <= 0x1f)) { | |
1510 | int i; | |
1511 | u64 hwcr; | |
1512 | bool need_toggle; | |
1513 | u32 msrs[] = { | |
575203b4 BP |
1514 | 0x00000413, /* MC4_MISC0 */ |
1515 | 0xc0000408, /* MC4_MISC1 */ | |
c9ce8712 | 1516 | }; |
575203b4 | 1517 | |
c9ce8712 | 1518 | rdmsrl(MSR_K7_HWCR, hwcr); |
575203b4 | 1519 | |
c9ce8712 BP |
1520 | /* McStatusWrEn has to be set */ |
1521 | need_toggle = !(hwcr & BIT(18)); | |
575203b4 | 1522 | |
c9ce8712 BP |
1523 | if (need_toggle) |
1524 | wrmsrl(MSR_K7_HWCR, hwcr | BIT(18)); | |
575203b4 | 1525 | |
c9ce8712 BP |
1526 | /* Clear CntP bit safely */ |
1527 | for (i = 0; i < ARRAY_SIZE(msrs); i++) | |
1528 | msr_clear_bit(msrs[i], 62); | |
575203b4 | 1529 | |
c9ce8712 BP |
1530 | /* restore old settings */ |
1531 | if (need_toggle) | |
1532 | wrmsrl(MSR_K7_HWCR, hwcr); | |
1533 | } | |
1da177e4 | 1534 | } |
e583538f | 1535 | |
06b7a7a5 AK |
1536 | if (c->x86_vendor == X86_VENDOR_INTEL) { |
1537 | /* | |
1538 | * SDM documents that on family 6 bank 0 should not be written | |
1539 | * because it aliases to another special BIOS controlled | |
1540 | * register. | |
1541 | * But it's not aliased anymore on model 0x1a+ | |
1542 | * Don't ignore bank 0 completely because there could be a | |
1543 | * valid event later, merely don't write CTL0. | |
1544 | */ | |
1545 | ||
d203f0b8 | 1546 | if (c->x86 == 6 && c->x86_model < 0x1A && cfg->banks > 0) |
cebe1820 | 1547 | mce_banks[0].init = 0; |
3c079792 AK |
1548 | |
1549 | /* | |
1550 | * All newer Intel systems support MCE broadcasting. Enable | |
1551 | * synchronization with a one second timeout. | |
1552 | */ | |
1553 | if ((c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xe)) && | |
84c2559d BP |
1554 | cfg->monarch_timeout < 0) |
1555 | cfg->monarch_timeout = USEC_PER_SEC; | |
c7f6fa44 | 1556 | |
e412cd25 IM |
1557 | /* |
1558 | * There are also broken BIOSes on some Pentium M and | |
1559 | * earlier systems: | |
1560 | */ | |
84c2559d BP |
1561 | if (c->x86 == 6 && c->x86_model <= 13 && cfg->bootlog < 0) |
1562 | cfg->bootlog = 0; | |
61b0fccd TL |
1563 | |
1564 | if (c->x86 == 6 && c->x86_model == 45) | |
1565 | quirk_no_way_out = quirk_sandybridge_ifu; | |
06b7a7a5 | 1566 | } |
84c2559d BP |
1567 | if (cfg->monarch_timeout < 0) |
1568 | cfg->monarch_timeout = 0; | |
1569 | if (cfg->bootlog != 0) | |
7af19e4a | 1570 | cfg->panic_timeout = 30; |
e412cd25 IM |
1571 | |
1572 | return 0; | |
d88203d1 | 1573 | } |
1da177e4 | 1574 | |
148f9bb8 | 1575 | static int __mcheck_cpu_ancient_init(struct cpuinfo_x86 *c) |
4efc0670 AK |
1576 | { |
1577 | if (c->x86 != 5) | |
3a97fc34 HS |
1578 | return 0; |
1579 | ||
4efc0670 AK |
1580 | switch (c->x86_vendor) { |
1581 | case X86_VENDOR_INTEL: | |
c6978369 | 1582 | intel_p5_mcheck_init(c); |
3a97fc34 | 1583 | return 1; |
4efc0670 AK |
1584 | break; |
1585 | case X86_VENDOR_CENTAUR: | |
1586 | winchip_mcheck_init(c); | |
3a97fc34 | 1587 | return 1; |
4efc0670 AK |
1588 | break; |
1589 | } | |
3a97fc34 HS |
1590 | |
1591 | return 0; | |
4efc0670 AK |
1592 | } |
1593 | ||
5e09954a | 1594 | static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c) |
1da177e4 LT |
1595 | { |
1596 | switch (c->x86_vendor) { | |
1597 | case X86_VENDOR_INTEL: | |
1598 | mce_intel_feature_init(c); | |
3f2f0680 | 1599 | mce_adjust_timer = cmci_intel_adjust_timer; |
1da177e4 | 1600 | break; |
7559e13f AG |
1601 | |
1602 | case X86_VENDOR_AMD: { | |
1603 | u32 ebx = cpuid_ebx(0x80000007); | |
1604 | ||
89b831ef | 1605 | mce_amd_feature_init(c); |
7559e13f AG |
1606 | mce_flags.overflow_recov = !!(ebx & BIT(0)); |
1607 | mce_flags.succor = !!(ebx & BIT(1)); | |
89b831ef | 1608 | break; |
7559e13f AG |
1609 | } |
1610 | ||
1da177e4 LT |
1611 | default: |
1612 | break; | |
1613 | } | |
1614 | } | |
1615 | ||
8838eb6c AR |
1616 | static void __mcheck_cpu_clear_vendor(struct cpuinfo_x86 *c) |
1617 | { | |
1618 | switch (c->x86_vendor) { | |
1619 | case X86_VENDOR_INTEL: | |
1620 | mce_intel_feature_clear(c); | |
1621 | break; | |
1622 | default: | |
1623 | break; | |
1624 | } | |
1625 | } | |
1626 | ||
26c3c283 | 1627 | static void mce_start_timer(unsigned int cpu, struct timer_list *t) |
52d168e2 | 1628 | { |
4f75d841 | 1629 | unsigned long iv = check_interval * HZ; |
bc09effa | 1630 | |
7af19e4a | 1631 | if (mca_cfg.ignore_ce || !iv) |
62fdac59 HS |
1632 | return; |
1633 | ||
4f75d841 BP |
1634 | per_cpu(mce_next_interval, cpu) = iv; |
1635 | ||
82f7af09 | 1636 | t->expires = round_jiffies(jiffies + iv); |
4f75d841 | 1637 | add_timer_on(t, cpu); |
52d168e2 AK |
1638 | } |
1639 | ||
26c3c283 TG |
1640 | static void __mcheck_cpu_init_timer(void) |
1641 | { | |
89cbc767 | 1642 | struct timer_list *t = this_cpu_ptr(&mce_timer); |
26c3c283 TG |
1643 | unsigned int cpu = smp_processor_id(); |
1644 | ||
1645 | setup_timer(t, mce_timer_fn, cpu); | |
1646 | mce_start_timer(cpu, t); | |
1647 | } | |
1648 | ||
9eda8cb3 AK |
1649 | /* Handle unconfigured int18 (should never happen) */ |
1650 | static void unexpected_machine_check(struct pt_regs *regs, long error_code) | |
1651 | { | |
c767a54b | 1652 | pr_err("CPU#%d: Unexpected int18 (Machine Check)\n", |
9eda8cb3 AK |
1653 | smp_processor_id()); |
1654 | } | |
1655 | ||
1656 | /* Call the installed machine check handler for this CPU setup. */ | |
1657 | void (*machine_check_vector)(struct pt_regs *, long error_code) = | |
1658 | unexpected_machine_check; | |
1659 | ||
d88203d1 | 1660 | /* |
1da177e4 | 1661 | * Called for each booted CPU to set up machine checks. |
e9eee03e | 1662 | * Must be called with preempt off: |
1da177e4 | 1663 | */ |
148f9bb8 | 1664 | void mcheck_cpu_init(struct cpuinfo_x86 *c) |
1da177e4 | 1665 | { |
1462594b | 1666 | if (mca_cfg.disabled) |
4efc0670 AK |
1667 | return; |
1668 | ||
3a97fc34 HS |
1669 | if (__mcheck_cpu_ancient_init(c)) |
1670 | return; | |
4efc0670 | 1671 | |
5b4408fd | 1672 | if (!mce_available(c)) |
1da177e4 LT |
1673 | return; |
1674 | ||
5e09954a | 1675 | if (__mcheck_cpu_cap_init() < 0 || __mcheck_cpu_apply_quirks(c) < 0) { |
1462594b | 1676 | mca_cfg.disabled = true; |
0d7482e3 AK |
1677 | return; |
1678 | } | |
0d7482e3 | 1679 | |
648ed940 CG |
1680 | if (mce_gen_pool_init()) { |
1681 | mca_cfg.disabled = true; | |
1682 | pr_emerg("Couldn't allocate MCE records pool!\n"); | |
1683 | return; | |
1684 | } | |
1685 | ||
5d727926 AK |
1686 | machine_check_vector = do_machine_check; |
1687 | ||
5e09954a BP |
1688 | __mcheck_cpu_init_generic(); |
1689 | __mcheck_cpu_init_vendor(c); | |
1690 | __mcheck_cpu_init_timer(); | |
1da177e4 LT |
1691 | } |
1692 | ||
8838eb6c AR |
1693 | /* |
1694 | * Called for each booted CPU to clear some machine checks opt-ins | |
1695 | */ | |
1696 | void mcheck_cpu_clear(struct cpuinfo_x86 *c) | |
1697 | { | |
1698 | if (mca_cfg.disabled) | |
1699 | return; | |
1700 | ||
1701 | if (!mce_available(c)) | |
1702 | return; | |
1703 | ||
1704 | /* | |
1705 | * Possibly to clear general settings generic to x86 | |
1706 | * __mcheck_cpu_clear_generic(c); | |
1707 | */ | |
1708 | __mcheck_cpu_clear_vendor(c); | |
1709 | ||
1da177e4 LT |
1710 | } |
1711 | ||
1712 | /* | |
93b62c3c | 1713 | * mce_chrdev: Character device /dev/mcelog to read and clear the MCE log. |
1da177e4 LT |
1714 | */ |
1715 | ||
93b62c3c HS |
1716 | static DEFINE_SPINLOCK(mce_chrdev_state_lock); |
1717 | static int mce_chrdev_open_count; /* #times opened */ | |
1718 | static int mce_chrdev_open_exclu; /* already open exclusive? */ | |
f528e7ba | 1719 | |
93b62c3c | 1720 | static int mce_chrdev_open(struct inode *inode, struct file *file) |
f528e7ba | 1721 | { |
93b62c3c | 1722 | spin_lock(&mce_chrdev_state_lock); |
f528e7ba | 1723 | |
93b62c3c HS |
1724 | if (mce_chrdev_open_exclu || |
1725 | (mce_chrdev_open_count && (file->f_flags & O_EXCL))) { | |
1726 | spin_unlock(&mce_chrdev_state_lock); | |
e9eee03e | 1727 | |
f528e7ba TH |
1728 | return -EBUSY; |
1729 | } | |
1730 | ||
1731 | if (file->f_flags & O_EXCL) | |
93b62c3c HS |
1732 | mce_chrdev_open_exclu = 1; |
1733 | mce_chrdev_open_count++; | |
f528e7ba | 1734 | |
93b62c3c | 1735 | spin_unlock(&mce_chrdev_state_lock); |
f528e7ba | 1736 | |
bd78432c | 1737 | return nonseekable_open(inode, file); |
f528e7ba TH |
1738 | } |
1739 | ||
93b62c3c | 1740 | static int mce_chrdev_release(struct inode *inode, struct file *file) |
f528e7ba | 1741 | { |
93b62c3c | 1742 | spin_lock(&mce_chrdev_state_lock); |
f528e7ba | 1743 | |
93b62c3c HS |
1744 | mce_chrdev_open_count--; |
1745 | mce_chrdev_open_exclu = 0; | |
f528e7ba | 1746 | |
93b62c3c | 1747 | spin_unlock(&mce_chrdev_state_lock); |
f528e7ba TH |
1748 | |
1749 | return 0; | |
1750 | } | |
1751 | ||
d88203d1 TG |
1752 | static void collect_tscs(void *data) |
1753 | { | |
1da177e4 | 1754 | unsigned long *cpu_tsc = (unsigned long *)data; |
d88203d1 | 1755 | |
4ea1636b | 1756 | cpu_tsc[smp_processor_id()] = rdtsc(); |
d88203d1 | 1757 | } |
1da177e4 | 1758 | |
482908b4 HY |
1759 | static int mce_apei_read_done; |
1760 | ||
1761 | /* Collect MCE record of previous boot in persistent storage via APEI ERST. */ | |
1762 | static int __mce_read_apei(char __user **ubuf, size_t usize) | |
1763 | { | |
1764 | int rc; | |
1765 | u64 record_id; | |
1766 | struct mce m; | |
1767 | ||
1768 | if (usize < sizeof(struct mce)) | |
1769 | return -EINVAL; | |
1770 | ||
1771 | rc = apei_read_mce(&m, &record_id); | |
1772 | /* Error or no more MCE record */ | |
1773 | if (rc <= 0) { | |
1774 | mce_apei_read_done = 1; | |
fadd85f1 NH |
1775 | /* |
1776 | * When ERST is disabled, mce_chrdev_read() should return | |
1777 | * "no record" instead of "no device." | |
1778 | */ | |
1779 | if (rc == -ENODEV) | |
1780 | return 0; | |
482908b4 HY |
1781 | return rc; |
1782 | } | |
1783 | rc = -EFAULT; | |
1784 | if (copy_to_user(*ubuf, &m, sizeof(struct mce))) | |
1785 | return rc; | |
1786 | /* | |
1787 | * In fact, we should have cleared the record after that has | |
1788 | * been flushed to the disk or sent to network in | |
1789 | * /sbin/mcelog, but we have no interface to support that now, | |
1790 | * so just clear it to avoid duplication. | |
1791 | */ | |
1792 | rc = apei_clear_mce(record_id); | |
1793 | if (rc) { | |
1794 | mce_apei_read_done = 1; | |
1795 | return rc; | |
1796 | } | |
1797 | *ubuf += sizeof(struct mce); | |
1798 | ||
1799 | return 0; | |
1800 | } | |
1801 | ||
93b62c3c HS |
1802 | static ssize_t mce_chrdev_read(struct file *filp, char __user *ubuf, |
1803 | size_t usize, loff_t *off) | |
1da177e4 | 1804 | { |
e9eee03e | 1805 | char __user *buf = ubuf; |
f0de53bb | 1806 | unsigned long *cpu_tsc; |
ef41df43 | 1807 | unsigned prev, next; |
1da177e4 LT |
1808 | int i, err; |
1809 | ||
6bca67f9 | 1810 | cpu_tsc = kmalloc(nr_cpu_ids * sizeof(long), GFP_KERNEL); |
f0de53bb AK |
1811 | if (!cpu_tsc) |
1812 | return -ENOMEM; | |
1813 | ||
93b62c3c | 1814 | mutex_lock(&mce_chrdev_read_mutex); |
482908b4 HY |
1815 | |
1816 | if (!mce_apei_read_done) { | |
1817 | err = __mce_read_apei(&buf, usize); | |
1818 | if (err || buf != ubuf) | |
1819 | goto out; | |
1820 | } | |
1821 | ||
9a7783d0 | 1822 | next = mce_log_get_idx_check(mcelog.next); |
1da177e4 LT |
1823 | |
1824 | /* Only supports full reads right now */ | |
482908b4 HY |
1825 | err = -EINVAL; |
1826 | if (*off != 0 || usize < MCE_LOG_LEN*sizeof(struct mce)) | |
1827 | goto out; | |
1da177e4 LT |
1828 | |
1829 | err = 0; | |
ef41df43 HY |
1830 | prev = 0; |
1831 | do { | |
1832 | for (i = prev; i < next; i++) { | |
1833 | unsigned long start = jiffies; | |
559faa6b | 1834 | struct mce *m = &mcelog.entry[i]; |
ef41df43 | 1835 | |
559faa6b | 1836 | while (!m->finished) { |
ef41df43 | 1837 | if (time_after_eq(jiffies, start + 2)) { |
559faa6b | 1838 | memset(m, 0, sizeof(*m)); |
ef41df43 HY |
1839 | goto timeout; |
1840 | } | |
1841 | cpu_relax(); | |
673242c1 | 1842 | } |
ef41df43 | 1843 | smp_rmb(); |
559faa6b HS |
1844 | err |= copy_to_user(buf, m, sizeof(*m)); |
1845 | buf += sizeof(*m); | |
ef41df43 HY |
1846 | timeout: |
1847 | ; | |
673242c1 | 1848 | } |
1da177e4 | 1849 | |
ef41df43 HY |
1850 | memset(mcelog.entry + prev, 0, |
1851 | (next - prev) * sizeof(struct mce)); | |
1852 | prev = next; | |
1853 | next = cmpxchg(&mcelog.next, prev, 0); | |
1854 | } while (next != prev); | |
1da177e4 | 1855 | |
b2b18660 | 1856 | synchronize_sched(); |
1da177e4 | 1857 | |
d88203d1 TG |
1858 | /* |
1859 | * Collect entries that were still getting written before the | |
1860 | * synchronize. | |
1861 | */ | |
15c8b6c1 | 1862 | on_each_cpu(collect_tscs, cpu_tsc, 1); |
e9eee03e | 1863 | |
d88203d1 | 1864 | for (i = next; i < MCE_LOG_LEN; i++) { |
559faa6b HS |
1865 | struct mce *m = &mcelog.entry[i]; |
1866 | ||
1867 | if (m->finished && m->tsc < cpu_tsc[m->cpu]) { | |
1868 | err |= copy_to_user(buf, m, sizeof(*m)); | |
1da177e4 | 1869 | smp_rmb(); |
559faa6b HS |
1870 | buf += sizeof(*m); |
1871 | memset(m, 0, sizeof(*m)); | |
1da177e4 | 1872 | } |
d88203d1 | 1873 | } |
482908b4 HY |
1874 | |
1875 | if (err) | |
1876 | err = -EFAULT; | |
1877 | ||
1878 | out: | |
93b62c3c | 1879 | mutex_unlock(&mce_chrdev_read_mutex); |
f0de53bb | 1880 | kfree(cpu_tsc); |
e9eee03e | 1881 | |
482908b4 | 1882 | return err ? err : buf - ubuf; |
1da177e4 LT |
1883 | } |
1884 | ||
93b62c3c | 1885 | static unsigned int mce_chrdev_poll(struct file *file, poll_table *wait) |
e02e68d3 | 1886 | { |
93b62c3c | 1887 | poll_wait(file, &mce_chrdev_wait, wait); |
e90328b8 | 1888 | if (READ_ONCE(mcelog.next)) |
e02e68d3 | 1889 | return POLLIN | POLLRDNORM; |
482908b4 HY |
1890 | if (!mce_apei_read_done && apei_check_mce()) |
1891 | return POLLIN | POLLRDNORM; | |
e02e68d3 TH |
1892 | return 0; |
1893 | } | |
1894 | ||
93b62c3c HS |
1895 | static long mce_chrdev_ioctl(struct file *f, unsigned int cmd, |
1896 | unsigned long arg) | |
1da177e4 LT |
1897 | { |
1898 | int __user *p = (int __user *)arg; | |
d88203d1 | 1899 | |
1da177e4 | 1900 | if (!capable(CAP_SYS_ADMIN)) |
d88203d1 | 1901 | return -EPERM; |
e9eee03e | 1902 | |
1da177e4 | 1903 | switch (cmd) { |
d88203d1 | 1904 | case MCE_GET_RECORD_LEN: |
1da177e4 LT |
1905 | return put_user(sizeof(struct mce), p); |
1906 | case MCE_GET_LOG_LEN: | |
d88203d1 | 1907 | return put_user(MCE_LOG_LEN, p); |
1da177e4 LT |
1908 | case MCE_GETCLEAR_FLAGS: { |
1909 | unsigned flags; | |
d88203d1 TG |
1910 | |
1911 | do { | |
1da177e4 | 1912 | flags = mcelog.flags; |
d88203d1 | 1913 | } while (cmpxchg(&mcelog.flags, flags, 0) != flags); |
e9eee03e | 1914 | |
d88203d1 | 1915 | return put_user(flags, p); |
1da177e4 LT |
1916 | } |
1917 | default: | |
d88203d1 TG |
1918 | return -ENOTTY; |
1919 | } | |
1da177e4 LT |
1920 | } |
1921 | ||
66f5ddf3 TL |
1922 | static ssize_t (*mce_write)(struct file *filp, const char __user *ubuf, |
1923 | size_t usize, loff_t *off); | |
1924 | ||
1925 | void register_mce_write_callback(ssize_t (*fn)(struct file *filp, | |
1926 | const char __user *ubuf, | |
1927 | size_t usize, loff_t *off)) | |
1928 | { | |
1929 | mce_write = fn; | |
1930 | } | |
1931 | EXPORT_SYMBOL_GPL(register_mce_write_callback); | |
1932 | ||
29c6820f PM |
1933 | static ssize_t mce_chrdev_write(struct file *filp, const char __user *ubuf, |
1934 | size_t usize, loff_t *off) | |
66f5ddf3 TL |
1935 | { |
1936 | if (mce_write) | |
1937 | return mce_write(filp, ubuf, usize, off); | |
1938 | else | |
1939 | return -EINVAL; | |
1940 | } | |
1941 | ||
1942 | static const struct file_operations mce_chrdev_ops = { | |
93b62c3c HS |
1943 | .open = mce_chrdev_open, |
1944 | .release = mce_chrdev_release, | |
1945 | .read = mce_chrdev_read, | |
66f5ddf3 | 1946 | .write = mce_chrdev_write, |
93b62c3c HS |
1947 | .poll = mce_chrdev_poll, |
1948 | .unlocked_ioctl = mce_chrdev_ioctl, | |
1949 | .llseek = no_llseek, | |
1da177e4 LT |
1950 | }; |
1951 | ||
93b62c3c | 1952 | static struct miscdevice mce_chrdev_device = { |
1da177e4 LT |
1953 | MISC_MCELOG_MINOR, |
1954 | "mcelog", | |
1955 | &mce_chrdev_ops, | |
1956 | }; | |
1957 | ||
c3d1fb56 NR |
1958 | static void __mce_disable_bank(void *arg) |
1959 | { | |
1960 | int bank = *((int *)arg); | |
89cbc767 | 1961 | __clear_bit(bank, this_cpu_ptr(mce_poll_banks)); |
c3d1fb56 NR |
1962 | cmci_disable_bank(bank); |
1963 | } | |
1964 | ||
1965 | void mce_disable_bank(int bank) | |
1966 | { | |
1967 | if (bank >= mca_cfg.banks) { | |
1968 | pr_warn(FW_BUG | |
1969 | "Ignoring request to disable invalid MCA bank %d.\n", | |
1970 | bank); | |
1971 | return; | |
1972 | } | |
1973 | set_bit(bank, mce_banks_ce_disabled); | |
1974 | on_each_cpu(__mce_disable_bank, &bank, 1); | |
1975 | } | |
1976 | ||
13503fa9 | 1977 | /* |
62fdac59 HS |
1978 | * mce=off Disables machine check |
1979 | * mce=no_cmci Disables CMCI | |
88d53867 | 1980 | * mce=no_lmce Disables LMCE |
62fdac59 HS |
1981 | * mce=dont_log_ce Clears corrected events silently, no log created for CEs. |
1982 | * mce=ignore_ce Disables polling and CMCI, corrected events are not cleared. | |
3c079792 AK |
1983 | * mce=TOLERANCELEVEL[,monarchtimeout] (number, see above) |
1984 | * monarchtimeout is how long to wait for other CPUs on machine | |
1985 | * check, or 0 to not wait | |
13503fa9 HS |
1986 | * mce=bootlog Log MCEs from before booting. Disabled by default on AMD. |
1987 | * mce=nobootlog Don't log MCEs from before booting. | |
450cc201 | 1988 | * mce=bios_cmci_threshold Don't program the CMCI threshold |
13503fa9 | 1989 | */ |
1da177e4 LT |
1990 | static int __init mcheck_enable(char *str) |
1991 | { | |
d203f0b8 BP |
1992 | struct mca_config *cfg = &mca_cfg; |
1993 | ||
e3346fc4 | 1994 | if (*str == 0) { |
4efc0670 | 1995 | enable_p5_mce(); |
e3346fc4 BZ |
1996 | return 1; |
1997 | } | |
4efc0670 AK |
1998 | if (*str == '=') |
1999 | str++; | |
1da177e4 | 2000 | if (!strcmp(str, "off")) |
1462594b | 2001 | cfg->disabled = true; |
62fdac59 | 2002 | else if (!strcmp(str, "no_cmci")) |
7af19e4a | 2003 | cfg->cmci_disabled = true; |
88d53867 AR |
2004 | else if (!strcmp(str, "no_lmce")) |
2005 | cfg->lmce_disabled = true; | |
62fdac59 | 2006 | else if (!strcmp(str, "dont_log_ce")) |
d203f0b8 | 2007 | cfg->dont_log_ce = true; |
62fdac59 | 2008 | else if (!strcmp(str, "ignore_ce")) |
7af19e4a | 2009 | cfg->ignore_ce = true; |
13503fa9 | 2010 | else if (!strcmp(str, "bootlog") || !strcmp(str, "nobootlog")) |
84c2559d | 2011 | cfg->bootlog = (str[0] == 'b'); |
450cc201 | 2012 | else if (!strcmp(str, "bios_cmci_threshold")) |
1462594b | 2013 | cfg->bios_cmci_threshold = true; |
3c079792 | 2014 | else if (isdigit(str[0])) { |
5c31b280 | 2015 | if (get_option(&str, &cfg->tolerant) == 2) |
84c2559d | 2016 | get_option(&str, &(cfg->monarch_timeout)); |
3c079792 | 2017 | } else { |
c767a54b | 2018 | pr_info("mce argument %s ignored. Please use /sys\n", str); |
13503fa9 HS |
2019 | return 0; |
2020 | } | |
9b41046c | 2021 | return 1; |
1da177e4 | 2022 | } |
4efc0670 | 2023 | __setup("mce", mcheck_enable); |
1da177e4 | 2024 | |
a2202aa2 | 2025 | int __init mcheck_init(void) |
b33a6363 | 2026 | { |
a2202aa2 | 2027 | mcheck_intel_therm_init(); |
eef4dfa0 | 2028 | mce_register_decode_chain(&mce_srao_nb); |
43eaa2a1 | 2029 | mcheck_vendor_init_severity(); |
a2202aa2 | 2030 | |
061120ae CG |
2031 | INIT_WORK(&mce_work, mce_process_work); |
2032 | init_irq_work(&mce_irq_work, mce_irq_work_cb); | |
2033 | ||
b33a6363 BP |
2034 | return 0; |
2035 | } | |
b33a6363 | 2036 | |
d88203d1 | 2037 | /* |
c7cece89 | 2038 | * mce_syscore: PM support |
d88203d1 | 2039 | */ |
1da177e4 | 2040 | |
973a2dd1 AK |
2041 | /* |
2042 | * Disable machine checks on suspend and shutdown. We can't really handle | |
2043 | * them later. | |
2044 | */ | |
5e09954a | 2045 | static int mce_disable_error_reporting(void) |
973a2dd1 AK |
2046 | { |
2047 | int i; | |
2048 | ||
d203f0b8 | 2049 | for (i = 0; i < mca_cfg.banks; i++) { |
cebe1820 | 2050 | struct mce_bank *b = &mce_banks[i]; |
11868a2d | 2051 | |
cebe1820 | 2052 | if (b->init) |
a2d32bcb | 2053 | wrmsrl(MSR_IA32_MCx_CTL(i), 0); |
06b7a7a5 | 2054 | } |
973a2dd1 AK |
2055 | return 0; |
2056 | } | |
2057 | ||
c7cece89 | 2058 | static int mce_syscore_suspend(void) |
973a2dd1 | 2059 | { |
5e09954a | 2060 | return mce_disable_error_reporting(); |
973a2dd1 AK |
2061 | } |
2062 | ||
c7cece89 | 2063 | static void mce_syscore_shutdown(void) |
973a2dd1 | 2064 | { |
f3c6ea1b | 2065 | mce_disable_error_reporting(); |
973a2dd1 AK |
2066 | } |
2067 | ||
e9eee03e IM |
2068 | /* |
2069 | * On resume clear all MCE state. Don't want to see leftovers from the BIOS. | |
2070 | * Only one CPU is active at this time, the others get re-added later using | |
2071 | * CPU hotplug: | |
2072 | */ | |
c7cece89 | 2073 | static void mce_syscore_resume(void) |
1da177e4 | 2074 | { |
5e09954a | 2075 | __mcheck_cpu_init_generic(); |
89cbc767 | 2076 | __mcheck_cpu_init_vendor(raw_cpu_ptr(&cpu_info)); |
1da177e4 LT |
2077 | } |
2078 | ||
f3c6ea1b | 2079 | static struct syscore_ops mce_syscore_ops = { |
c7cece89 HS |
2080 | .suspend = mce_syscore_suspend, |
2081 | .shutdown = mce_syscore_shutdown, | |
2082 | .resume = mce_syscore_resume, | |
f3c6ea1b RW |
2083 | }; |
2084 | ||
c7cece89 | 2085 | /* |
8a25a2fd | 2086 | * mce_device: Sysfs support |
c7cece89 HS |
2087 | */ |
2088 | ||
52d168e2 AK |
2089 | static void mce_cpu_restart(void *data) |
2090 | { | |
89cbc767 | 2091 | if (!mce_available(raw_cpu_ptr(&cpu_info))) |
33edbf02 | 2092 | return; |
5e09954a BP |
2093 | __mcheck_cpu_init_generic(); |
2094 | __mcheck_cpu_init_timer(); | |
52d168e2 AK |
2095 | } |
2096 | ||
1da177e4 | 2097 | /* Reinit MCEs after user configuration changes */ |
d88203d1 TG |
2098 | static void mce_restart(void) |
2099 | { | |
9aaef96f | 2100 | mce_timer_delete_all(); |
52d168e2 | 2101 | on_each_cpu(mce_cpu_restart, NULL, 1); |
1da177e4 LT |
2102 | } |
2103 | ||
9af43b54 | 2104 | /* Toggle features for corrected errors */ |
9aaef96f | 2105 | static void mce_disable_cmci(void *data) |
9af43b54 | 2106 | { |
89cbc767 | 2107 | if (!mce_available(raw_cpu_ptr(&cpu_info))) |
9af43b54 | 2108 | return; |
9af43b54 HS |
2109 | cmci_clear(); |
2110 | } | |
2111 | ||
2112 | static void mce_enable_ce(void *all) | |
2113 | { | |
89cbc767 | 2114 | if (!mce_available(raw_cpu_ptr(&cpu_info))) |
9af43b54 HS |
2115 | return; |
2116 | cmci_reenable(); | |
2117 | cmci_recheck(); | |
2118 | if (all) | |
5e09954a | 2119 | __mcheck_cpu_init_timer(); |
9af43b54 HS |
2120 | } |
2121 | ||
8a25a2fd | 2122 | static struct bus_type mce_subsys = { |
e9eee03e | 2123 | .name = "machinecheck", |
8a25a2fd | 2124 | .dev_name = "machinecheck", |
1da177e4 LT |
2125 | }; |
2126 | ||
d6126ef5 | 2127 | DEFINE_PER_CPU(struct device *, mce_device); |
e9eee03e | 2128 | |
e9eee03e | 2129 | void (*threshold_cpu_callback)(unsigned long action, unsigned int cpu); |
1da177e4 | 2130 | |
8a25a2fd | 2131 | static inline struct mce_bank *attr_to_bank(struct device_attribute *attr) |
cebe1820 AK |
2132 | { |
2133 | return container_of(attr, struct mce_bank, attr); | |
2134 | } | |
0d7482e3 | 2135 | |
8a25a2fd | 2136 | static ssize_t show_bank(struct device *s, struct device_attribute *attr, |
0d7482e3 AK |
2137 | char *buf) |
2138 | { | |
cebe1820 | 2139 | return sprintf(buf, "%llx\n", attr_to_bank(attr)->ctl); |
0d7482e3 AK |
2140 | } |
2141 | ||
8a25a2fd | 2142 | static ssize_t set_bank(struct device *s, struct device_attribute *attr, |
9319cec8 | 2143 | const char *buf, size_t size) |
0d7482e3 | 2144 | { |
9319cec8 | 2145 | u64 new; |
e9eee03e | 2146 | |
164109e3 | 2147 | if (kstrtou64(buf, 0, &new) < 0) |
0d7482e3 | 2148 | return -EINVAL; |
e9eee03e | 2149 | |
cebe1820 | 2150 | attr_to_bank(attr)->ctl = new; |
0d7482e3 | 2151 | mce_restart(); |
e9eee03e | 2152 | |
9319cec8 | 2153 | return size; |
0d7482e3 | 2154 | } |
a98f0dd3 | 2155 | |
e9eee03e | 2156 | static ssize_t |
8a25a2fd | 2157 | show_trigger(struct device *s, struct device_attribute *attr, char *buf) |
a98f0dd3 | 2158 | { |
1020bcbc | 2159 | strcpy(buf, mce_helper); |
a98f0dd3 | 2160 | strcat(buf, "\n"); |
1020bcbc | 2161 | return strlen(mce_helper) + 1; |
a98f0dd3 AK |
2162 | } |
2163 | ||
8a25a2fd | 2164 | static ssize_t set_trigger(struct device *s, struct device_attribute *attr, |
e9eee03e | 2165 | const char *buf, size_t siz) |
a98f0dd3 AK |
2166 | { |
2167 | char *p; | |
e9eee03e | 2168 | |
1020bcbc HS |
2169 | strncpy(mce_helper, buf, sizeof(mce_helper)); |
2170 | mce_helper[sizeof(mce_helper)-1] = 0; | |
1020bcbc | 2171 | p = strchr(mce_helper, '\n'); |
e9eee03e | 2172 | |
e9084ec9 | 2173 | if (p) |
e9eee03e IM |
2174 | *p = 0; |
2175 | ||
e9084ec9 | 2176 | return strlen(mce_helper) + !!p; |
a98f0dd3 AK |
2177 | } |
2178 | ||
8a25a2fd KS |
2179 | static ssize_t set_ignore_ce(struct device *s, |
2180 | struct device_attribute *attr, | |
9af43b54 HS |
2181 | const char *buf, size_t size) |
2182 | { | |
2183 | u64 new; | |
2184 | ||
164109e3 | 2185 | if (kstrtou64(buf, 0, &new) < 0) |
9af43b54 HS |
2186 | return -EINVAL; |
2187 | ||
7af19e4a | 2188 | if (mca_cfg.ignore_ce ^ !!new) { |
9af43b54 HS |
2189 | if (new) { |
2190 | /* disable ce features */ | |
9aaef96f HS |
2191 | mce_timer_delete_all(); |
2192 | on_each_cpu(mce_disable_cmci, NULL, 1); | |
7af19e4a | 2193 | mca_cfg.ignore_ce = true; |
9af43b54 HS |
2194 | } else { |
2195 | /* enable ce features */ | |
7af19e4a | 2196 | mca_cfg.ignore_ce = false; |
9af43b54 HS |
2197 | on_each_cpu(mce_enable_ce, (void *)1, 1); |
2198 | } | |
2199 | } | |
2200 | return size; | |
2201 | } | |
2202 | ||
8a25a2fd KS |
2203 | static ssize_t set_cmci_disabled(struct device *s, |
2204 | struct device_attribute *attr, | |
9af43b54 HS |
2205 | const char *buf, size_t size) |
2206 | { | |
2207 | u64 new; | |
2208 | ||
164109e3 | 2209 | if (kstrtou64(buf, 0, &new) < 0) |
9af43b54 HS |
2210 | return -EINVAL; |
2211 | ||
7af19e4a | 2212 | if (mca_cfg.cmci_disabled ^ !!new) { |
9af43b54 HS |
2213 | if (new) { |
2214 | /* disable cmci */ | |
9aaef96f | 2215 | on_each_cpu(mce_disable_cmci, NULL, 1); |
7af19e4a | 2216 | mca_cfg.cmci_disabled = true; |
9af43b54 HS |
2217 | } else { |
2218 | /* enable cmci */ | |
7af19e4a | 2219 | mca_cfg.cmci_disabled = false; |
9af43b54 HS |
2220 | on_each_cpu(mce_enable_ce, NULL, 1); |
2221 | } | |
2222 | } | |
2223 | return size; | |
2224 | } | |
2225 | ||
8a25a2fd KS |
2226 | static ssize_t store_int_with_restart(struct device *s, |
2227 | struct device_attribute *attr, | |
b56f642d AK |
2228 | const char *buf, size_t size) |
2229 | { | |
8a25a2fd | 2230 | ssize_t ret = device_store_int(s, attr, buf, size); |
b56f642d AK |
2231 | mce_restart(); |
2232 | return ret; | |
2233 | } | |
2234 | ||
8a25a2fd | 2235 | static DEVICE_ATTR(trigger, 0644, show_trigger, set_trigger); |
d203f0b8 | 2236 | static DEVICE_INT_ATTR(tolerant, 0644, mca_cfg.tolerant); |
84c2559d | 2237 | static DEVICE_INT_ATTR(monarch_timeout, 0644, mca_cfg.monarch_timeout); |
d203f0b8 | 2238 | static DEVICE_BOOL_ATTR(dont_log_ce, 0644, mca_cfg.dont_log_ce); |
e9eee03e | 2239 | |
8a25a2fd KS |
2240 | static struct dev_ext_attribute dev_attr_check_interval = { |
2241 | __ATTR(check_interval, 0644, device_show_int, store_int_with_restart), | |
b56f642d AK |
2242 | &check_interval |
2243 | }; | |
e9eee03e | 2244 | |
8a25a2fd | 2245 | static struct dev_ext_attribute dev_attr_ignore_ce = { |
7af19e4a BP |
2246 | __ATTR(ignore_ce, 0644, device_show_bool, set_ignore_ce), |
2247 | &mca_cfg.ignore_ce | |
9af43b54 HS |
2248 | }; |
2249 | ||
8a25a2fd | 2250 | static struct dev_ext_attribute dev_attr_cmci_disabled = { |
7af19e4a BP |
2251 | __ATTR(cmci_disabled, 0644, device_show_bool, set_cmci_disabled), |
2252 | &mca_cfg.cmci_disabled | |
9af43b54 HS |
2253 | }; |
2254 | ||
8a25a2fd KS |
2255 | static struct device_attribute *mce_device_attrs[] = { |
2256 | &dev_attr_tolerant.attr, | |
2257 | &dev_attr_check_interval.attr, | |
2258 | &dev_attr_trigger, | |
2259 | &dev_attr_monarch_timeout.attr, | |
2260 | &dev_attr_dont_log_ce.attr, | |
2261 | &dev_attr_ignore_ce.attr, | |
2262 | &dev_attr_cmci_disabled.attr, | |
a98f0dd3 AK |
2263 | NULL |
2264 | }; | |
1da177e4 | 2265 | |
8a25a2fd | 2266 | static cpumask_var_t mce_device_initialized; |
bae19fe0 | 2267 | |
e032d807 GKH |
2268 | static void mce_device_release(struct device *dev) |
2269 | { | |
2270 | kfree(dev); | |
2271 | } | |
2272 | ||
8a25a2fd | 2273 | /* Per cpu device init. All of the cpus still share the same ctrl bank: */ |
148f9bb8 | 2274 | static int mce_device_create(unsigned int cpu) |
1da177e4 | 2275 | { |
e032d807 | 2276 | struct device *dev; |
1da177e4 | 2277 | int err; |
b1f49f95 | 2278 | int i, j; |
92cb7612 | 2279 | |
90367556 | 2280 | if (!mce_available(&boot_cpu_data)) |
91c6d400 AK |
2281 | return -EIO; |
2282 | ||
e032d807 GKH |
2283 | dev = kzalloc(sizeof *dev, GFP_KERNEL); |
2284 | if (!dev) | |
2285 | return -ENOMEM; | |
8a25a2fd KS |
2286 | dev->id = cpu; |
2287 | dev->bus = &mce_subsys; | |
e032d807 | 2288 | dev->release = &mce_device_release; |
91c6d400 | 2289 | |
8a25a2fd | 2290 | err = device_register(dev); |
853d9b18 LK |
2291 | if (err) { |
2292 | put_device(dev); | |
d435d862 | 2293 | return err; |
853d9b18 | 2294 | } |
d435d862 | 2295 | |
8a25a2fd KS |
2296 | for (i = 0; mce_device_attrs[i]; i++) { |
2297 | err = device_create_file(dev, mce_device_attrs[i]); | |
d435d862 AM |
2298 | if (err) |
2299 | goto error; | |
2300 | } | |
d203f0b8 | 2301 | for (j = 0; j < mca_cfg.banks; j++) { |
8a25a2fd | 2302 | err = device_create_file(dev, &mce_banks[j].attr); |
0d7482e3 AK |
2303 | if (err) |
2304 | goto error2; | |
2305 | } | |
8a25a2fd | 2306 | cpumask_set_cpu(cpu, mce_device_initialized); |
d6126ef5 | 2307 | per_cpu(mce_device, cpu) = dev; |
91c6d400 | 2308 | |
d435d862 | 2309 | return 0; |
0d7482e3 | 2310 | error2: |
b1f49f95 | 2311 | while (--j >= 0) |
8a25a2fd | 2312 | device_remove_file(dev, &mce_banks[j].attr); |
d435d862 | 2313 | error: |
cb491fca | 2314 | while (--i >= 0) |
8a25a2fd | 2315 | device_remove_file(dev, mce_device_attrs[i]); |
cb491fca | 2316 | |
8a25a2fd | 2317 | device_unregister(dev); |
d435d862 | 2318 | |
91c6d400 AK |
2319 | return err; |
2320 | } | |
2321 | ||
148f9bb8 | 2322 | static void mce_device_remove(unsigned int cpu) |
91c6d400 | 2323 | { |
d6126ef5 | 2324 | struct device *dev = per_cpu(mce_device, cpu); |
73ca5358 SL |
2325 | int i; |
2326 | ||
8a25a2fd | 2327 | if (!cpumask_test_cpu(cpu, mce_device_initialized)) |
bae19fe0 AH |
2328 | return; |
2329 | ||
8a25a2fd KS |
2330 | for (i = 0; mce_device_attrs[i]; i++) |
2331 | device_remove_file(dev, mce_device_attrs[i]); | |
cb491fca | 2332 | |
d203f0b8 | 2333 | for (i = 0; i < mca_cfg.banks; i++) |
8a25a2fd | 2334 | device_remove_file(dev, &mce_banks[i].attr); |
cb491fca | 2335 | |
8a25a2fd KS |
2336 | device_unregister(dev); |
2337 | cpumask_clear_cpu(cpu, mce_device_initialized); | |
d6126ef5 | 2338 | per_cpu(mce_device, cpu) = NULL; |
91c6d400 | 2339 | } |
91c6d400 | 2340 | |
d6b75584 | 2341 | /* Make sure there are no machine checks on offlined CPUs. */ |
148f9bb8 | 2342 | static void mce_disable_cpu(void *h) |
d6b75584 | 2343 | { |
88ccbedd | 2344 | unsigned long action = *(unsigned long *)h; |
cb491fca | 2345 | int i; |
d6b75584 | 2346 | |
89cbc767 | 2347 | if (!mce_available(raw_cpu_ptr(&cpu_info))) |
d6b75584 | 2348 | return; |
767df1bd | 2349 | |
88ccbedd AK |
2350 | if (!(action & CPU_TASKS_FROZEN)) |
2351 | cmci_clear(); | |
d203f0b8 | 2352 | for (i = 0; i < mca_cfg.banks; i++) { |
cebe1820 | 2353 | struct mce_bank *b = &mce_banks[i]; |
11868a2d | 2354 | |
cebe1820 | 2355 | if (b->init) |
a2d32bcb | 2356 | wrmsrl(MSR_IA32_MCx_CTL(i), 0); |
06b7a7a5 | 2357 | } |
d6b75584 AK |
2358 | } |
2359 | ||
148f9bb8 | 2360 | static void mce_reenable_cpu(void *h) |
d6b75584 | 2361 | { |
88ccbedd | 2362 | unsigned long action = *(unsigned long *)h; |
e9eee03e | 2363 | int i; |
d6b75584 | 2364 | |
89cbc767 | 2365 | if (!mce_available(raw_cpu_ptr(&cpu_info))) |
d6b75584 | 2366 | return; |
e9eee03e | 2367 | |
88ccbedd AK |
2368 | if (!(action & CPU_TASKS_FROZEN)) |
2369 | cmci_reenable(); | |
d203f0b8 | 2370 | for (i = 0; i < mca_cfg.banks; i++) { |
cebe1820 | 2371 | struct mce_bank *b = &mce_banks[i]; |
11868a2d | 2372 | |
cebe1820 | 2373 | if (b->init) |
a2d32bcb | 2374 | wrmsrl(MSR_IA32_MCx_CTL(i), b->ctl); |
06b7a7a5 | 2375 | } |
d6b75584 AK |
2376 | } |
2377 | ||
91c6d400 | 2378 | /* Get notified when a cpu comes on/off. Be hotplug friendly. */ |
148f9bb8 | 2379 | static int |
e9eee03e | 2380 | mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) |
91c6d400 AK |
2381 | { |
2382 | unsigned int cpu = (unsigned long)hcpu; | |
52d168e2 | 2383 | struct timer_list *t = &per_cpu(mce_timer, cpu); |
91c6d400 | 2384 | |
1a65f970 | 2385 | switch (action & ~CPU_TASKS_FROZEN) { |
bae19fe0 | 2386 | case CPU_ONLINE: |
8a25a2fd | 2387 | mce_device_create(cpu); |
8735728e RW |
2388 | if (threshold_cpu_callback) |
2389 | threshold_cpu_callback(action, cpu); | |
91c6d400 | 2390 | break; |
91c6d400 | 2391 | case CPU_DEAD: |
8735728e RW |
2392 | if (threshold_cpu_callback) |
2393 | threshold_cpu_callback(action, cpu); | |
8a25a2fd | 2394 | mce_device_remove(cpu); |
55babd8f | 2395 | mce_intel_hcpu_update(cpu); |
38356c1f BP |
2396 | |
2397 | /* intentionally ignoring frozen here */ | |
2398 | if (!(action & CPU_TASKS_FROZEN)) | |
2399 | cmci_rediscover(); | |
91c6d400 | 2400 | break; |
52d168e2 | 2401 | case CPU_DOWN_PREPARE: |
88ccbedd | 2402 | smp_call_function_single(cpu, mce_disable_cpu, &action, 1); |
55babd8f | 2403 | del_timer_sync(t); |
52d168e2 AK |
2404 | break; |
2405 | case CPU_DOWN_FAILED: | |
88ccbedd | 2406 | smp_call_function_single(cpu, mce_reenable_cpu, &action, 1); |
26c3c283 | 2407 | mce_start_timer(cpu, t); |
88ccbedd | 2408 | break; |
1a65f970 TG |
2409 | } |
2410 | ||
bae19fe0 | 2411 | return NOTIFY_OK; |
91c6d400 AK |
2412 | } |
2413 | ||
148f9bb8 | 2414 | static struct notifier_block mce_cpu_notifier = { |
91c6d400 AK |
2415 | .notifier_call = mce_cpu_callback, |
2416 | }; | |
2417 | ||
cebe1820 | 2418 | static __init void mce_init_banks(void) |
0d7482e3 AK |
2419 | { |
2420 | int i; | |
2421 | ||
d203f0b8 | 2422 | for (i = 0; i < mca_cfg.banks; i++) { |
cebe1820 | 2423 | struct mce_bank *b = &mce_banks[i]; |
8a25a2fd | 2424 | struct device_attribute *a = &b->attr; |
e9eee03e | 2425 | |
a07e4156 | 2426 | sysfs_attr_init(&a->attr); |
cebe1820 AK |
2427 | a->attr.name = b->attrname; |
2428 | snprintf(b->attrname, ATTR_LEN, "bank%d", i); | |
e9eee03e IM |
2429 | |
2430 | a->attr.mode = 0644; | |
2431 | a->show = show_bank; | |
2432 | a->store = set_bank; | |
0d7482e3 | 2433 | } |
0d7482e3 AK |
2434 | } |
2435 | ||
5e09954a | 2436 | static __init int mcheck_init_device(void) |
91c6d400 AK |
2437 | { |
2438 | int err; | |
2439 | int i = 0; | |
2440 | ||
9c15a24b MS |
2441 | if (!mce_available(&boot_cpu_data)) { |
2442 | err = -EIO; | |
2443 | goto err_out; | |
2444 | } | |
0d7482e3 | 2445 | |
9c15a24b MS |
2446 | if (!zalloc_cpumask_var(&mce_device_initialized, GFP_KERNEL)) { |
2447 | err = -ENOMEM; | |
2448 | goto err_out; | |
2449 | } | |
996867d0 | 2450 | |
cebe1820 | 2451 | mce_init_banks(); |
0d7482e3 | 2452 | |
8a25a2fd | 2453 | err = subsys_system_register(&mce_subsys, NULL); |
d435d862 | 2454 | if (err) |
9c15a24b | 2455 | goto err_out_mem; |
91c6d400 | 2456 | |
82a8f131 | 2457 | cpu_notifier_register_begin(); |
91c6d400 | 2458 | for_each_online_cpu(i) { |
8a25a2fd | 2459 | err = mce_device_create(i); |
82a8f131 | 2460 | if (err) { |
27c93415 BP |
2461 | /* |
2462 | * Register notifier anyway (and do not unreg it) so | |
2463 | * that we don't leave undeleted timers, see notifier | |
2464 | * callback above. | |
2465 | */ | |
2466 | __register_hotcpu_notifier(&mce_cpu_notifier); | |
82a8f131 | 2467 | cpu_notifier_register_done(); |
9c15a24b | 2468 | goto err_device_create; |
82a8f131 | 2469 | } |
91c6d400 AK |
2470 | } |
2471 | ||
82a8f131 SB |
2472 | __register_hotcpu_notifier(&mce_cpu_notifier); |
2473 | cpu_notifier_register_done(); | |
93b62c3c | 2474 | |
9c15a24b MS |
2475 | register_syscore_ops(&mce_syscore_ops); |
2476 | ||
93b62c3c | 2477 | /* register character device /dev/mcelog */ |
9c15a24b MS |
2478 | err = misc_register(&mce_chrdev_device); |
2479 | if (err) | |
2480 | goto err_register; | |
2481 | ||
2482 | return 0; | |
2483 | ||
2484 | err_register: | |
2485 | unregister_syscore_ops(&mce_syscore_ops); | |
2486 | ||
9c15a24b MS |
2487 | err_device_create: |
2488 | /* | |
2489 | * We didn't keep track of which devices were created above, but | |
2490 | * even if we had, the set of online cpus might have changed. | |
2491 | * Play safe and remove for every possible cpu, since | |
2492 | * mce_device_remove() will do the right thing. | |
2493 | */ | |
2494 | for_each_possible_cpu(i) | |
2495 | mce_device_remove(i); | |
2496 | ||
2497 | err_out_mem: | |
2498 | free_cpumask_var(mce_device_initialized); | |
2499 | ||
2500 | err_out: | |
2501 | pr_err("Unable to init device /dev/mcelog (rc: %d)\n", err); | |
e9eee03e | 2502 | |
1da177e4 | 2503 | return err; |
1da177e4 | 2504 | } |
cef12ee5 | 2505 | device_initcall_sync(mcheck_init_device); |
a988d334 | 2506 | |
d7c3c9a6 AK |
2507 | /* |
2508 | * Old style boot options parsing. Only for compatibility. | |
2509 | */ | |
2510 | static int __init mcheck_disable(char *str) | |
2511 | { | |
1462594b | 2512 | mca_cfg.disabled = true; |
d7c3c9a6 AK |
2513 | return 1; |
2514 | } | |
2515 | __setup("nomce", mcheck_disable); | |
a988d334 | 2516 | |
5be9ed25 HY |
2517 | #ifdef CONFIG_DEBUG_FS |
2518 | struct dentry *mce_get_debugfs_dir(void) | |
a988d334 | 2519 | { |
5be9ed25 | 2520 | static struct dentry *dmce; |
a988d334 | 2521 | |
5be9ed25 HY |
2522 | if (!dmce) |
2523 | dmce = debugfs_create_dir("mce", NULL); | |
a988d334 | 2524 | |
5be9ed25 HY |
2525 | return dmce; |
2526 | } | |
a988d334 | 2527 | |
bf783f9f HY |
2528 | static void mce_reset(void) |
2529 | { | |
2530 | cpu_missing = 0; | |
c7c9b392 | 2531 | atomic_set(&mce_fake_panicked, 0); |
bf783f9f HY |
2532 | atomic_set(&mce_executing, 0); |
2533 | atomic_set(&mce_callin, 0); | |
2534 | atomic_set(&global_nwo, 0); | |
2535 | } | |
a988d334 | 2536 | |
bf783f9f HY |
2537 | static int fake_panic_get(void *data, u64 *val) |
2538 | { | |
2539 | *val = fake_panic; | |
2540 | return 0; | |
a988d334 IM |
2541 | } |
2542 | ||
bf783f9f | 2543 | static int fake_panic_set(void *data, u64 val) |
a988d334 | 2544 | { |
bf783f9f HY |
2545 | mce_reset(); |
2546 | fake_panic = val; | |
2547 | return 0; | |
a988d334 | 2548 | } |
a988d334 | 2549 | |
bf783f9f HY |
2550 | DEFINE_SIMPLE_ATTRIBUTE(fake_panic_fops, fake_panic_get, |
2551 | fake_panic_set, "%llu\n"); | |
d7c3c9a6 | 2552 | |
5e09954a | 2553 | static int __init mcheck_debugfs_init(void) |
d7c3c9a6 | 2554 | { |
bf783f9f HY |
2555 | struct dentry *dmce, *ffake_panic; |
2556 | ||
2557 | dmce = mce_get_debugfs_dir(); | |
2558 | if (!dmce) | |
2559 | return -ENOMEM; | |
2560 | ffake_panic = debugfs_create_file("fake_panic", 0444, dmce, NULL, | |
2561 | &fake_panic_fops); | |
2562 | if (!ffake_panic) | |
2563 | return -ENOMEM; | |
2564 | ||
2565 | return 0; | |
d7c3c9a6 | 2566 | } |
fd4cf79f CG |
2567 | #else |
2568 | static int __init mcheck_debugfs_init(void) { return -EINVAL; } | |
5be9ed25 | 2569 | #endif |
fd4cf79f CG |
2570 | |
2571 | static int __init mcheck_late_init(void) | |
2572 | { | |
2573 | mcheck_debugfs_init(); | |
2574 | ||
2575 | /* | |
2576 | * Flush out everything that has been logged during early boot, now that | |
2577 | * everything has been initialized (workqueues, decoders, ...). | |
2578 | */ | |
2579 | mce_schedule_work(); | |
2580 | ||
2581 | return 0; | |
2582 | } | |
2583 | late_initcall(mcheck_late_init); |