Commit | Line | Data |
---|---|---|
a08f82d0 HY |
1 | /* |
2 | * APEI Error Record Serialization Table support | |
3 | * | |
4 | * ERST is a way provided by APEI to save and retrieve hardware error | |
58f87ed0 | 5 | * information to and from a persistent store. |
a08f82d0 HY |
6 | * |
7 | * For more information about ERST, please refer to ACPI Specification | |
8 | * version 4.0, section 17.4. | |
9 | * | |
10 | * Copyright 2010 Intel Corp. | |
11 | * Author: Huang Ying <ying.huang@intel.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or | |
14 | * modify it under the terms of the GNU General Public License version | |
15 | * 2 as published by the Free Software Foundation. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
a08f82d0 HY |
21 | */ |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/io.h> | |
28 | #include <linux/acpi.h> | |
29 | #include <linux/uaccess.h> | |
30 | #include <linux/cper.h> | |
31 | #include <linux/nmi.h> | |
0a7992c9 | 32 | #include <linux/hardirq.h> |
0bb77c46 | 33 | #include <linux/pstore.h> |
d6472302 | 34 | #include <linux/vmalloc.h> |
a08f82d0 HY |
35 | #include <acpi/apei.h> |
36 | ||
37 | #include "apei-internal.h" | |
38 | ||
cb82a2e4 BP |
39 | #undef pr_fmt |
40 | #define pr_fmt(fmt) "ERST: " fmt | |
a08f82d0 HY |
41 | |
42 | /* ERST command status */ | |
43 | #define ERST_STATUS_SUCCESS 0x0 | |
44 | #define ERST_STATUS_NOT_ENOUGH_SPACE 0x1 | |
45 | #define ERST_STATUS_HARDWARE_NOT_AVAILABLE 0x2 | |
46 | #define ERST_STATUS_FAILED 0x3 | |
47 | #define ERST_STATUS_RECORD_STORE_EMPTY 0x4 | |
48 | #define ERST_STATUS_RECORD_NOT_FOUND 0x5 | |
49 | ||
50 | #define ERST_TAB_ENTRY(tab) \ | |
51 | ((struct acpi_whea_header *)((char *)(tab) + \ | |
52 | sizeof(struct acpi_table_erst))) | |
53 | ||
54 | #define SPIN_UNIT 100 /* 100ns */ | |
e8a8b252 | 55 | /* Firmware should respond within 1 milliseconds */ |
a08f82d0 HY |
56 | #define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC) |
57 | #define FIRMWARE_MAX_STALL 50 /* 50us */ | |
58 | ||
59 | int erst_disable; | |
60 | EXPORT_SYMBOL_GPL(erst_disable); | |
61 | ||
62 | static struct acpi_table_erst *erst_tab; | |
63 | ||
64 | /* ERST Error Log Address Range atrributes */ | |
65 | #define ERST_RANGE_RESERVED 0x0001 | |
66 | #define ERST_RANGE_NVRAM 0x0002 | |
67 | #define ERST_RANGE_SLOW 0x0004 | |
68 | ||
69 | /* | |
70 | * ERST Error Log Address Range, used as buffer for reading/writing | |
71 | * error records. | |
72 | */ | |
73 | static struct erst_erange { | |
74 | u64 base; | |
75 | u64 size; | |
76 | void __iomem *vaddr; | |
77 | u32 attr; | |
78 | } erst_erange; | |
79 | ||
80 | /* | |
81 | * Prevent ERST interpreter to run simultaneously, because the | |
82 | * corresponding firmware implementation may not work properly when | |
83 | * invoked simultaneously. | |
84 | * | |
85 | * It is used to provide exclusive accessing for ERST Error Log | |
86 | * Address Range too. | |
87 | */ | |
3b38bb5f | 88 | static DEFINE_RAW_SPINLOCK(erst_lock); |
a08f82d0 HY |
89 | |
90 | static inline int erst_errno(int command_status) | |
91 | { | |
92 | switch (command_status) { | |
93 | case ERST_STATUS_SUCCESS: | |
94 | return 0; | |
95 | case ERST_STATUS_HARDWARE_NOT_AVAILABLE: | |
96 | return -ENODEV; | |
97 | case ERST_STATUS_NOT_ENOUGH_SPACE: | |
98 | return -ENOSPC; | |
99 | case ERST_STATUS_RECORD_STORE_EMPTY: | |
100 | case ERST_STATUS_RECORD_NOT_FOUND: | |
101 | return -ENOENT; | |
102 | default: | |
103 | return -EINVAL; | |
104 | } | |
105 | } | |
106 | ||
107 | static int erst_timedout(u64 *t, u64 spin_unit) | |
108 | { | |
109 | if ((s64)*t < spin_unit) { | |
cb82a2e4 | 110 | pr_warn(FW_WARN "Firmware does not respond in time.\n"); |
a08f82d0 HY |
111 | return 1; |
112 | } | |
113 | *t -= spin_unit; | |
114 | ndelay(spin_unit); | |
115 | touch_nmi_watchdog(); | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static int erst_exec_load_var1(struct apei_exec_context *ctx, | |
120 | struct acpi_whea_header *entry) | |
121 | { | |
122 | return __apei_exec_read_register(entry, &ctx->var1); | |
123 | } | |
124 | ||
125 | static int erst_exec_load_var2(struct apei_exec_context *ctx, | |
126 | struct acpi_whea_header *entry) | |
127 | { | |
128 | return __apei_exec_read_register(entry, &ctx->var2); | |
129 | } | |
130 | ||
131 | static int erst_exec_store_var1(struct apei_exec_context *ctx, | |
132 | struct acpi_whea_header *entry) | |
133 | { | |
134 | return __apei_exec_write_register(entry, ctx->var1); | |
135 | } | |
136 | ||
137 | static int erst_exec_add(struct apei_exec_context *ctx, | |
138 | struct acpi_whea_header *entry) | |
139 | { | |
140 | ctx->var1 += ctx->var2; | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static int erst_exec_subtract(struct apei_exec_context *ctx, | |
145 | struct acpi_whea_header *entry) | |
146 | { | |
147 | ctx->var1 -= ctx->var2; | |
148 | return 0; | |
149 | } | |
150 | ||
151 | static int erst_exec_add_value(struct apei_exec_context *ctx, | |
152 | struct acpi_whea_header *entry) | |
153 | { | |
154 | int rc; | |
155 | u64 val; | |
156 | ||
157 | rc = __apei_exec_read_register(entry, &val); | |
158 | if (rc) | |
159 | return rc; | |
160 | val += ctx->value; | |
161 | rc = __apei_exec_write_register(entry, val); | |
162 | return rc; | |
163 | } | |
164 | ||
165 | static int erst_exec_subtract_value(struct apei_exec_context *ctx, | |
166 | struct acpi_whea_header *entry) | |
167 | { | |
168 | int rc; | |
169 | u64 val; | |
170 | ||
171 | rc = __apei_exec_read_register(entry, &val); | |
172 | if (rc) | |
173 | return rc; | |
174 | val -= ctx->value; | |
175 | rc = __apei_exec_write_register(entry, val); | |
176 | return rc; | |
177 | } | |
178 | ||
179 | static int erst_exec_stall(struct apei_exec_context *ctx, | |
180 | struct acpi_whea_header *entry) | |
181 | { | |
182 | u64 stall_time; | |
183 | ||
184 | if (ctx->value > FIRMWARE_MAX_STALL) { | |
185 | if (!in_nmi()) | |
cb82a2e4 BP |
186 | pr_warn(FW_WARN |
187 | "Too long stall time for stall instruction: 0x%llx.\n", | |
a08f82d0 HY |
188 | ctx->value); |
189 | stall_time = FIRMWARE_MAX_STALL; | |
190 | } else | |
191 | stall_time = ctx->value; | |
192 | udelay(stall_time); | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static int erst_exec_stall_while_true(struct apei_exec_context *ctx, | |
197 | struct acpi_whea_header *entry) | |
198 | { | |
199 | int rc; | |
200 | u64 val; | |
201 | u64 timeout = FIRMWARE_TIMEOUT; | |
202 | u64 stall_time; | |
203 | ||
204 | if (ctx->var1 > FIRMWARE_MAX_STALL) { | |
205 | if (!in_nmi()) | |
cb82a2e4 BP |
206 | pr_warn(FW_WARN |
207 | "Too long stall time for stall while true instruction: 0x%llx.\n", | |
a08f82d0 HY |
208 | ctx->var1); |
209 | stall_time = FIRMWARE_MAX_STALL; | |
210 | } else | |
211 | stall_time = ctx->var1; | |
212 | ||
213 | for (;;) { | |
214 | rc = __apei_exec_read_register(entry, &val); | |
215 | if (rc) | |
216 | return rc; | |
217 | if (val != ctx->value) | |
218 | break; | |
219 | if (erst_timedout(&timeout, stall_time * NSEC_PER_USEC)) | |
220 | return -EIO; | |
221 | } | |
222 | return 0; | |
223 | } | |
224 | ||
225 | static int erst_exec_skip_next_instruction_if_true( | |
226 | struct apei_exec_context *ctx, | |
227 | struct acpi_whea_header *entry) | |
228 | { | |
229 | int rc; | |
230 | u64 val; | |
231 | ||
232 | rc = __apei_exec_read_register(entry, &val); | |
233 | if (rc) | |
234 | return rc; | |
235 | if (val == ctx->value) { | |
236 | ctx->ip += 2; | |
237 | return APEI_EXEC_SET_IP; | |
238 | } | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | static int erst_exec_goto(struct apei_exec_context *ctx, | |
244 | struct acpi_whea_header *entry) | |
245 | { | |
246 | ctx->ip = ctx->value; | |
247 | return APEI_EXEC_SET_IP; | |
248 | } | |
249 | ||
250 | static int erst_exec_set_src_address_base(struct apei_exec_context *ctx, | |
251 | struct acpi_whea_header *entry) | |
252 | { | |
253 | return __apei_exec_read_register(entry, &ctx->src_base); | |
254 | } | |
255 | ||
256 | static int erst_exec_set_dst_address_base(struct apei_exec_context *ctx, | |
257 | struct acpi_whea_header *entry) | |
258 | { | |
259 | return __apei_exec_read_register(entry, &ctx->dst_base); | |
260 | } | |
261 | ||
262 | static int erst_exec_move_data(struct apei_exec_context *ctx, | |
263 | struct acpi_whea_header *entry) | |
264 | { | |
265 | int rc; | |
266 | u64 offset; | |
0bbba38a HY |
267 | void *src, *dst; |
268 | ||
269 | /* ioremap does not work in interrupt context */ | |
270 | if (in_interrupt()) { | |
cb82a2e4 | 271 | pr_warn("MOVE_DATA can not be used in interrupt context.\n"); |
0bbba38a HY |
272 | return -EBUSY; |
273 | } | |
a08f82d0 HY |
274 | |
275 | rc = __apei_exec_read_register(entry, &offset); | |
276 | if (rc) | |
277 | return rc; | |
0bbba38a HY |
278 | |
279 | src = ioremap(ctx->src_base + offset, ctx->var2); | |
280 | if (!src) | |
281 | return -ENOMEM; | |
282 | dst = ioremap(ctx->dst_base + offset, ctx->var2); | |
08b326d0 WY |
283 | if (!dst) { |
284 | iounmap(src); | |
0bbba38a | 285 | return -ENOMEM; |
08b326d0 | 286 | } |
0bbba38a HY |
287 | |
288 | memmove(dst, src, ctx->var2); | |
289 | ||
290 | iounmap(src); | |
291 | iounmap(dst); | |
a08f82d0 HY |
292 | |
293 | return 0; | |
294 | } | |
295 | ||
296 | static struct apei_exec_ins_type erst_ins_type[] = { | |
297 | [ACPI_ERST_READ_REGISTER] = { | |
298 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
299 | .run = apei_exec_read_register, | |
300 | }, | |
301 | [ACPI_ERST_READ_REGISTER_VALUE] = { | |
302 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
303 | .run = apei_exec_read_register_value, | |
304 | }, | |
305 | [ACPI_ERST_WRITE_REGISTER] = { | |
306 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
307 | .run = apei_exec_write_register, | |
308 | }, | |
309 | [ACPI_ERST_WRITE_REGISTER_VALUE] = { | |
310 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
311 | .run = apei_exec_write_register_value, | |
312 | }, | |
313 | [ACPI_ERST_NOOP] = { | |
314 | .flags = 0, | |
315 | .run = apei_exec_noop, | |
316 | }, | |
317 | [ACPI_ERST_LOAD_VAR1] = { | |
318 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
319 | .run = erst_exec_load_var1, | |
320 | }, | |
321 | [ACPI_ERST_LOAD_VAR2] = { | |
322 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
323 | .run = erst_exec_load_var2, | |
324 | }, | |
325 | [ACPI_ERST_STORE_VAR1] = { | |
326 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
327 | .run = erst_exec_store_var1, | |
328 | }, | |
329 | [ACPI_ERST_ADD] = { | |
330 | .flags = 0, | |
331 | .run = erst_exec_add, | |
332 | }, | |
333 | [ACPI_ERST_SUBTRACT] = { | |
334 | .flags = 0, | |
335 | .run = erst_exec_subtract, | |
336 | }, | |
337 | [ACPI_ERST_ADD_VALUE] = { | |
338 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
339 | .run = erst_exec_add_value, | |
340 | }, | |
341 | [ACPI_ERST_SUBTRACT_VALUE] = { | |
342 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
343 | .run = erst_exec_subtract_value, | |
344 | }, | |
345 | [ACPI_ERST_STALL] = { | |
346 | .flags = 0, | |
347 | .run = erst_exec_stall, | |
348 | }, | |
349 | [ACPI_ERST_STALL_WHILE_TRUE] = { | |
350 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
351 | .run = erst_exec_stall_while_true, | |
352 | }, | |
353 | [ACPI_ERST_SKIP_NEXT_IF_TRUE] = { | |
354 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
355 | .run = erst_exec_skip_next_instruction_if_true, | |
356 | }, | |
357 | [ACPI_ERST_GOTO] = { | |
358 | .flags = 0, | |
359 | .run = erst_exec_goto, | |
360 | }, | |
361 | [ACPI_ERST_SET_SRC_ADDRESS_BASE] = { | |
362 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
363 | .run = erst_exec_set_src_address_base, | |
364 | }, | |
365 | [ACPI_ERST_SET_DST_ADDRESS_BASE] = { | |
366 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
367 | .run = erst_exec_set_dst_address_base, | |
368 | }, | |
369 | [ACPI_ERST_MOVE_DATA] = { | |
370 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
371 | .run = erst_exec_move_data, | |
372 | }, | |
373 | }; | |
374 | ||
375 | static inline void erst_exec_ctx_init(struct apei_exec_context *ctx) | |
376 | { | |
377 | apei_exec_ctx_init(ctx, erst_ins_type, ARRAY_SIZE(erst_ins_type), | |
378 | ERST_TAB_ENTRY(erst_tab), erst_tab->entries); | |
379 | } | |
380 | ||
381 | static int erst_get_erange(struct erst_erange *range) | |
382 | { | |
383 | struct apei_exec_context ctx; | |
384 | int rc; | |
385 | ||
386 | erst_exec_ctx_init(&ctx); | |
387 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_RANGE); | |
388 | if (rc) | |
389 | return rc; | |
390 | range->base = apei_exec_ctx_get_output(&ctx); | |
391 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_LENGTH); | |
392 | if (rc) | |
393 | return rc; | |
394 | range->size = apei_exec_ctx_get_output(&ctx); | |
395 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_ATTRIBUTES); | |
396 | if (rc) | |
397 | return rc; | |
398 | range->attr = apei_exec_ctx_get_output(&ctx); | |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
403 | static ssize_t __erst_get_record_count(void) | |
404 | { | |
405 | struct apei_exec_context ctx; | |
406 | int rc; | |
407 | ||
408 | erst_exec_ctx_init(&ctx); | |
409 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_RECORD_COUNT); | |
410 | if (rc) | |
411 | return rc; | |
412 | return apei_exec_ctx_get_output(&ctx); | |
413 | } | |
414 | ||
415 | ssize_t erst_get_record_count(void) | |
416 | { | |
417 | ssize_t count; | |
418 | unsigned long flags; | |
419 | ||
420 | if (erst_disable) | |
421 | return -ENODEV; | |
422 | ||
3b38bb5f | 423 | raw_spin_lock_irqsave(&erst_lock, flags); |
a08f82d0 | 424 | count = __erst_get_record_count(); |
3b38bb5f | 425 | raw_spin_unlock_irqrestore(&erst_lock, flags); |
a08f82d0 HY |
426 | |
427 | return count; | |
428 | } | |
429 | EXPORT_SYMBOL_GPL(erst_get_record_count); | |
430 | ||
885b976f HY |
431 | #define ERST_RECORD_ID_CACHE_SIZE_MIN 16 |
432 | #define ERST_RECORD_ID_CACHE_SIZE_MAX 1024 | |
433 | ||
434 | struct erst_record_id_cache { | |
435 | struct mutex lock; | |
436 | u64 *entries; | |
437 | int len; | |
438 | int size; | |
439 | int refcount; | |
440 | }; | |
441 | ||
442 | static struct erst_record_id_cache erst_record_id_cache = { | |
443 | .lock = __MUTEX_INITIALIZER(erst_record_id_cache.lock), | |
444 | .refcount = 0, | |
445 | }; | |
446 | ||
a08f82d0 HY |
447 | static int __erst_get_next_record_id(u64 *record_id) |
448 | { | |
449 | struct apei_exec_context ctx; | |
450 | int rc; | |
451 | ||
452 | erst_exec_ctx_init(&ctx); | |
453 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_RECORD_ID); | |
454 | if (rc) | |
455 | return rc; | |
456 | *record_id = apei_exec_ctx_get_output(&ctx); | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
885b976f HY |
461 | int erst_get_record_id_begin(int *pos) |
462 | { | |
463 | int rc; | |
464 | ||
465 | if (erst_disable) | |
466 | return -ENODEV; | |
467 | ||
468 | rc = mutex_lock_interruptible(&erst_record_id_cache.lock); | |
469 | if (rc) | |
470 | return rc; | |
471 | erst_record_id_cache.refcount++; | |
472 | mutex_unlock(&erst_record_id_cache.lock); | |
473 | ||
474 | *pos = 0; | |
475 | ||
476 | return 0; | |
477 | } | |
478 | EXPORT_SYMBOL_GPL(erst_get_record_id_begin); | |
479 | ||
480 | /* erst_record_id_cache.lock must be held by caller */ | |
481 | static int __erst_record_id_cache_add_one(void) | |
482 | { | |
483 | u64 id, prev_id, first_id; | |
484 | int i, rc; | |
485 | u64 *entries; | |
486 | unsigned long flags; | |
487 | ||
488 | id = prev_id = first_id = APEI_ERST_INVALID_RECORD_ID; | |
489 | retry: | |
490 | raw_spin_lock_irqsave(&erst_lock, flags); | |
491 | rc = __erst_get_next_record_id(&id); | |
492 | raw_spin_unlock_irqrestore(&erst_lock, flags); | |
493 | if (rc == -ENOENT) | |
494 | return 0; | |
495 | if (rc) | |
496 | return rc; | |
497 | if (id == APEI_ERST_INVALID_RECORD_ID) | |
498 | return 0; | |
499 | /* can not skip current ID, or loop back to first ID */ | |
500 | if (id == prev_id || id == first_id) | |
501 | return 0; | |
502 | if (first_id == APEI_ERST_INVALID_RECORD_ID) | |
503 | first_id = id; | |
504 | prev_id = id; | |
505 | ||
506 | entries = erst_record_id_cache.entries; | |
507 | for (i = 0; i < erst_record_id_cache.len; i++) { | |
508 | if (entries[i] == id) | |
509 | break; | |
510 | } | |
511 | /* record id already in cache, try next */ | |
512 | if (i < erst_record_id_cache.len) | |
513 | goto retry; | |
514 | if (erst_record_id_cache.len >= erst_record_id_cache.size) { | |
515 | int new_size, alloc_size; | |
516 | u64 *new_entries; | |
517 | ||
518 | new_size = erst_record_id_cache.size * 2; | |
519 | new_size = clamp_val(new_size, ERST_RECORD_ID_CACHE_SIZE_MIN, | |
520 | ERST_RECORD_ID_CACHE_SIZE_MAX); | |
521 | if (new_size <= erst_record_id_cache.size) { | |
522 | if (printk_ratelimit()) | |
cb82a2e4 | 523 | pr_warn(FW_WARN "too many record IDs!\n"); |
885b976f HY |
524 | return 0; |
525 | } | |
526 | alloc_size = new_size * sizeof(entries[0]); | |
527 | if (alloc_size < PAGE_SIZE) | |
528 | new_entries = kmalloc(alloc_size, GFP_KERNEL); | |
529 | else | |
530 | new_entries = vmalloc(alloc_size); | |
531 | if (!new_entries) | |
532 | return -ENOMEM; | |
533 | memcpy(new_entries, entries, | |
534 | erst_record_id_cache.len * sizeof(entries[0])); | |
535 | if (erst_record_id_cache.size < PAGE_SIZE) | |
536 | kfree(entries); | |
537 | else | |
538 | vfree(entries); | |
539 | erst_record_id_cache.entries = entries = new_entries; | |
540 | erst_record_id_cache.size = new_size; | |
541 | } | |
542 | entries[i] = id; | |
543 | erst_record_id_cache.len++; | |
544 | ||
545 | return 1; | |
546 | } | |
547 | ||
a08f82d0 HY |
548 | /* |
549 | * Get the record ID of an existing error record on the persistent | |
550 | * storage. If there is no error record on the persistent storage, the | |
551 | * returned record_id is APEI_ERST_INVALID_RECORD_ID. | |
552 | */ | |
885b976f | 553 | int erst_get_record_id_next(int *pos, u64 *record_id) |
a08f82d0 | 554 | { |
885b976f HY |
555 | int rc = 0; |
556 | u64 *entries; | |
a08f82d0 HY |
557 | |
558 | if (erst_disable) | |
559 | return -ENODEV; | |
560 | ||
885b976f HY |
561 | /* must be enclosed by erst_get_record_id_begin/end */ |
562 | BUG_ON(!erst_record_id_cache.refcount); | |
563 | BUG_ON(*pos < 0 || *pos > erst_record_id_cache.len); | |
564 | ||
565 | mutex_lock(&erst_record_id_cache.lock); | |
566 | entries = erst_record_id_cache.entries; | |
567 | for (; *pos < erst_record_id_cache.len; (*pos)++) | |
568 | if (entries[*pos] != APEI_ERST_INVALID_RECORD_ID) | |
569 | break; | |
570 | /* found next record id in cache */ | |
571 | if (*pos < erst_record_id_cache.len) { | |
572 | *record_id = entries[*pos]; | |
573 | (*pos)++; | |
574 | goto out_unlock; | |
575 | } | |
576 | ||
577 | /* Try to add one more record ID to cache */ | |
578 | rc = __erst_record_id_cache_add_one(); | |
579 | if (rc < 0) | |
580 | goto out_unlock; | |
581 | /* successfully add one new ID */ | |
582 | if (rc == 1) { | |
583 | *record_id = erst_record_id_cache.entries[*pos]; | |
584 | (*pos)++; | |
585 | rc = 0; | |
586 | } else { | |
587 | *pos = -1; | |
588 | *record_id = APEI_ERST_INVALID_RECORD_ID; | |
589 | } | |
590 | out_unlock: | |
591 | mutex_unlock(&erst_record_id_cache.lock); | |
a08f82d0 HY |
592 | |
593 | return rc; | |
594 | } | |
885b976f HY |
595 | EXPORT_SYMBOL_GPL(erst_get_record_id_next); |
596 | ||
597 | /* erst_record_id_cache.lock must be held by caller */ | |
598 | static void __erst_record_id_cache_compact(void) | |
599 | { | |
600 | int i, wpos = 0; | |
601 | u64 *entries; | |
602 | ||
603 | if (erst_record_id_cache.refcount) | |
604 | return; | |
605 | ||
606 | entries = erst_record_id_cache.entries; | |
607 | for (i = 0; i < erst_record_id_cache.len; i++) { | |
608 | if (entries[i] == APEI_ERST_INVALID_RECORD_ID) | |
609 | continue; | |
610 | if (wpos != i) | |
d3ab3edc | 611 | entries[wpos] = entries[i]; |
885b976f HY |
612 | wpos++; |
613 | } | |
614 | erst_record_id_cache.len = wpos; | |
615 | } | |
616 | ||
617 | void erst_get_record_id_end(void) | |
618 | { | |
619 | /* | |
620 | * erst_disable != 0 should be detected by invoker via the | |
621 | * return value of erst_get_record_id_begin/next, so this | |
622 | * function should not be called for erst_disable != 0. | |
623 | */ | |
624 | BUG_ON(erst_disable); | |
625 | ||
626 | mutex_lock(&erst_record_id_cache.lock); | |
627 | erst_record_id_cache.refcount--; | |
628 | BUG_ON(erst_record_id_cache.refcount < 0); | |
629 | __erst_record_id_cache_compact(); | |
630 | mutex_unlock(&erst_record_id_cache.lock); | |
631 | } | |
632 | EXPORT_SYMBOL_GPL(erst_get_record_id_end); | |
a08f82d0 HY |
633 | |
634 | static int __erst_write_to_storage(u64 offset) | |
635 | { | |
636 | struct apei_exec_context ctx; | |
637 | u64 timeout = FIRMWARE_TIMEOUT; | |
638 | u64 val; | |
639 | int rc; | |
640 | ||
641 | erst_exec_ctx_init(&ctx); | |
392913de | 642 | rc = apei_exec_run_optional(&ctx, ACPI_ERST_BEGIN_WRITE); |
a08f82d0 HY |
643 | if (rc) |
644 | return rc; | |
645 | apei_exec_ctx_set_input(&ctx, offset); | |
646 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_OFFSET); | |
647 | if (rc) | |
648 | return rc; | |
649 | rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION); | |
650 | if (rc) | |
651 | return rc; | |
652 | for (;;) { | |
653 | rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS); | |
654 | if (rc) | |
655 | return rc; | |
656 | val = apei_exec_ctx_get_output(&ctx); | |
657 | if (!val) | |
658 | break; | |
659 | if (erst_timedout(&timeout, SPIN_UNIT)) | |
660 | return -EIO; | |
661 | } | |
662 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS); | |
663 | if (rc) | |
664 | return rc; | |
665 | val = apei_exec_ctx_get_output(&ctx); | |
392913de | 666 | rc = apei_exec_run_optional(&ctx, ACPI_ERST_END); |
a08f82d0 HY |
667 | if (rc) |
668 | return rc; | |
669 | ||
670 | return erst_errno(val); | |
671 | } | |
672 | ||
673 | static int __erst_read_from_storage(u64 record_id, u64 offset) | |
674 | { | |
675 | struct apei_exec_context ctx; | |
676 | u64 timeout = FIRMWARE_TIMEOUT; | |
677 | u64 val; | |
678 | int rc; | |
679 | ||
680 | erst_exec_ctx_init(&ctx); | |
392913de | 681 | rc = apei_exec_run_optional(&ctx, ACPI_ERST_BEGIN_READ); |
a08f82d0 HY |
682 | if (rc) |
683 | return rc; | |
684 | apei_exec_ctx_set_input(&ctx, offset); | |
685 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_OFFSET); | |
686 | if (rc) | |
687 | return rc; | |
688 | apei_exec_ctx_set_input(&ctx, record_id); | |
689 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_ID); | |
690 | if (rc) | |
691 | return rc; | |
692 | rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION); | |
693 | if (rc) | |
694 | return rc; | |
695 | for (;;) { | |
696 | rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS); | |
697 | if (rc) | |
698 | return rc; | |
699 | val = apei_exec_ctx_get_output(&ctx); | |
700 | if (!val) | |
701 | break; | |
702 | if (erst_timedout(&timeout, SPIN_UNIT)) | |
703 | return -EIO; | |
704 | }; | |
705 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS); | |
706 | if (rc) | |
707 | return rc; | |
708 | val = apei_exec_ctx_get_output(&ctx); | |
392913de | 709 | rc = apei_exec_run_optional(&ctx, ACPI_ERST_END); |
a08f82d0 HY |
710 | if (rc) |
711 | return rc; | |
712 | ||
713 | return erst_errno(val); | |
714 | } | |
715 | ||
716 | static int __erst_clear_from_storage(u64 record_id) | |
717 | { | |
718 | struct apei_exec_context ctx; | |
719 | u64 timeout = FIRMWARE_TIMEOUT; | |
720 | u64 val; | |
721 | int rc; | |
722 | ||
723 | erst_exec_ctx_init(&ctx); | |
392913de | 724 | rc = apei_exec_run_optional(&ctx, ACPI_ERST_BEGIN_CLEAR); |
a08f82d0 HY |
725 | if (rc) |
726 | return rc; | |
727 | apei_exec_ctx_set_input(&ctx, record_id); | |
728 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_ID); | |
729 | if (rc) | |
730 | return rc; | |
731 | rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION); | |
732 | if (rc) | |
733 | return rc; | |
734 | for (;;) { | |
735 | rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS); | |
736 | if (rc) | |
737 | return rc; | |
738 | val = apei_exec_ctx_get_output(&ctx); | |
739 | if (!val) | |
740 | break; | |
741 | if (erst_timedout(&timeout, SPIN_UNIT)) | |
742 | return -EIO; | |
743 | } | |
744 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS); | |
745 | if (rc) | |
746 | return rc; | |
747 | val = apei_exec_ctx_get_output(&ctx); | |
392913de | 748 | rc = apei_exec_run_optional(&ctx, ACPI_ERST_END); |
a08f82d0 HY |
749 | if (rc) |
750 | return rc; | |
751 | ||
752 | return erst_errno(val); | |
753 | } | |
754 | ||
755 | /* NVRAM ERST Error Log Address Range is not supported yet */ | |
756 | static void pr_unimpl_nvram(void) | |
757 | { | |
758 | if (printk_ratelimit()) | |
cb82a2e4 | 759 | pr_warn("NVRAM ERST Log Address Range not implemented yet.\n"); |
a08f82d0 HY |
760 | } |
761 | ||
762 | static int __erst_write_to_nvram(const struct cper_record_header *record) | |
763 | { | |
764 | /* do not print message, because printk is not safe for NMI */ | |
765 | return -ENOSYS; | |
766 | } | |
767 | ||
768 | static int __erst_read_to_erange_from_nvram(u64 record_id, u64 *offset) | |
769 | { | |
770 | pr_unimpl_nvram(); | |
771 | return -ENOSYS; | |
772 | } | |
773 | ||
774 | static int __erst_clear_from_nvram(u64 record_id) | |
775 | { | |
776 | pr_unimpl_nvram(); | |
777 | return -ENOSYS; | |
778 | } | |
779 | ||
780 | int erst_write(const struct cper_record_header *record) | |
781 | { | |
782 | int rc; | |
783 | unsigned long flags; | |
784 | struct cper_record_header *rcd_erange; | |
785 | ||
786 | if (erst_disable) | |
787 | return -ENODEV; | |
788 | ||
789 | if (memcmp(record->signature, CPER_SIG_RECORD, CPER_SIG_SIZE)) | |
790 | return -EINVAL; | |
791 | ||
792 | if (erst_erange.attr & ERST_RANGE_NVRAM) { | |
3b38bb5f | 793 | if (!raw_spin_trylock_irqsave(&erst_lock, flags)) |
a08f82d0 HY |
794 | return -EBUSY; |
795 | rc = __erst_write_to_nvram(record); | |
3b38bb5f | 796 | raw_spin_unlock_irqrestore(&erst_lock, flags); |
a08f82d0 HY |
797 | return rc; |
798 | } | |
799 | ||
800 | if (record->record_length > erst_erange.size) | |
801 | return -EINVAL; | |
802 | ||
3b38bb5f | 803 | if (!raw_spin_trylock_irqsave(&erst_lock, flags)) |
a08f82d0 HY |
804 | return -EBUSY; |
805 | memcpy(erst_erange.vaddr, record, record->record_length); | |
806 | rcd_erange = erst_erange.vaddr; | |
807 | /* signature for serialization system */ | |
808 | memcpy(&rcd_erange->persistence_information, "ER", 2); | |
809 | ||
810 | rc = __erst_write_to_storage(0); | |
3b38bb5f | 811 | raw_spin_unlock_irqrestore(&erst_lock, flags); |
a08f82d0 HY |
812 | |
813 | return rc; | |
814 | } | |
815 | EXPORT_SYMBOL_GPL(erst_write); | |
816 | ||
817 | static int __erst_read_to_erange(u64 record_id, u64 *offset) | |
818 | { | |
819 | int rc; | |
820 | ||
821 | if (erst_erange.attr & ERST_RANGE_NVRAM) | |
822 | return __erst_read_to_erange_from_nvram( | |
823 | record_id, offset); | |
824 | ||
825 | rc = __erst_read_from_storage(record_id, 0); | |
826 | if (rc) | |
827 | return rc; | |
828 | *offset = 0; | |
829 | ||
830 | return 0; | |
831 | } | |
832 | ||
833 | static ssize_t __erst_read(u64 record_id, struct cper_record_header *record, | |
834 | size_t buflen) | |
835 | { | |
836 | int rc; | |
837 | u64 offset, len = 0; | |
838 | struct cper_record_header *rcd_tmp; | |
839 | ||
840 | rc = __erst_read_to_erange(record_id, &offset); | |
841 | if (rc) | |
842 | return rc; | |
843 | rcd_tmp = erst_erange.vaddr + offset; | |
844 | len = rcd_tmp->record_length; | |
845 | if (len <= buflen) | |
846 | memcpy(record, rcd_tmp, len); | |
847 | ||
848 | return len; | |
849 | } | |
850 | ||
851 | /* | |
852 | * If return value > buflen, the buffer size is not big enough, | |
853 | * else if return value < 0, something goes wrong, | |
854 | * else everything is OK, and return value is record length | |
855 | */ | |
856 | ssize_t erst_read(u64 record_id, struct cper_record_header *record, | |
857 | size_t buflen) | |
858 | { | |
859 | ssize_t len; | |
860 | unsigned long flags; | |
861 | ||
862 | if (erst_disable) | |
863 | return -ENODEV; | |
864 | ||
3b38bb5f | 865 | raw_spin_lock_irqsave(&erst_lock, flags); |
a08f82d0 | 866 | len = __erst_read(record_id, record, buflen); |
3b38bb5f | 867 | raw_spin_unlock_irqrestore(&erst_lock, flags); |
a08f82d0 HY |
868 | return len; |
869 | } | |
870 | EXPORT_SYMBOL_GPL(erst_read); | |
871 | ||
a08f82d0 HY |
872 | int erst_clear(u64 record_id) |
873 | { | |
885b976f | 874 | int rc, i; |
a08f82d0 | 875 | unsigned long flags; |
885b976f | 876 | u64 *entries; |
a08f82d0 HY |
877 | |
878 | if (erst_disable) | |
879 | return -ENODEV; | |
880 | ||
885b976f HY |
881 | rc = mutex_lock_interruptible(&erst_record_id_cache.lock); |
882 | if (rc) | |
883 | return rc; | |
3b38bb5f | 884 | raw_spin_lock_irqsave(&erst_lock, flags); |
a08f82d0 HY |
885 | if (erst_erange.attr & ERST_RANGE_NVRAM) |
886 | rc = __erst_clear_from_nvram(record_id); | |
887 | else | |
888 | rc = __erst_clear_from_storage(record_id); | |
3b38bb5f | 889 | raw_spin_unlock_irqrestore(&erst_lock, flags); |
885b976f HY |
890 | if (rc) |
891 | goto out; | |
892 | entries = erst_record_id_cache.entries; | |
893 | for (i = 0; i < erst_record_id_cache.len; i++) { | |
894 | if (entries[i] == record_id) | |
895 | entries[i] = APEI_ERST_INVALID_RECORD_ID; | |
896 | } | |
897 | __erst_record_id_cache_compact(); | |
898 | out: | |
899 | mutex_unlock(&erst_record_id_cache.lock); | |
a08f82d0 HY |
900 | return rc; |
901 | } | |
902 | EXPORT_SYMBOL_GPL(erst_clear); | |
903 | ||
904 | static int __init setup_erst_disable(char *str) | |
905 | { | |
906 | erst_disable = 1; | |
907 | return 0; | |
908 | } | |
909 | ||
910 | __setup("erst_disable", setup_erst_disable); | |
911 | ||
912 | static int erst_check_table(struct acpi_table_erst *erst_tab) | |
913 | { | |
3a78f965 HY |
914 | if ((erst_tab->header_length != |
915 | (sizeof(struct acpi_table_erst) - sizeof(erst_tab->header))) | |
7ed28f2e | 916 | && (erst_tab->header_length != sizeof(struct acpi_table_erst))) |
a08f82d0 HY |
917 | return -EINVAL; |
918 | if (erst_tab->header.length < sizeof(struct acpi_table_erst)) | |
919 | return -EINVAL; | |
920 | if (erst_tab->entries != | |
921 | (erst_tab->header.length - sizeof(struct acpi_table_erst)) / | |
922 | sizeof(struct acpi_erst_entry)) | |
923 | return -EINVAL; | |
924 | ||
925 | return 0; | |
926 | } | |
927 | ||
06cf91b4 CG |
928 | static int erst_open_pstore(struct pstore_info *psi); |
929 | static int erst_close_pstore(struct pstore_info *psi); | |
755d4fe4 | 930 | static ssize_t erst_reader(u64 *id, enum pstore_type_id *type, int *count, |
f6f82851 | 931 | struct timespec *time, char **buf, |
9a4e1398 | 932 | bool *compressed, struct pstore_info *psi); |
3d6d8d20 | 933 | static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason, |
b3b515bb | 934 | u64 *id, unsigned int part, int count, bool compressed, |
b94fdd07 | 935 | size_t size, struct pstore_info *psi); |
755d4fe4 | 936 | static int erst_clearer(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 937 | struct timespec time, struct pstore_info *psi); |
0bb77c46 TL |
938 | |
939 | static struct pstore_info erst_info = { | |
940 | .owner = THIS_MODULE, | |
941 | .name = "erst", | |
df36ac1b | 942 | .flags = PSTORE_FLAGS_FRAGILE, |
06cf91b4 CG |
943 | .open = erst_open_pstore, |
944 | .close = erst_close_pstore, | |
0bb77c46 TL |
945 | .read = erst_reader, |
946 | .write = erst_writer, | |
638c1fd3 | 947 | .erase = erst_clearer |
0bb77c46 TL |
948 | }; |
949 | ||
950 | #define CPER_CREATOR_PSTORE \ | |
951 | UUID_LE(0x75a574e3, 0x5052, 0x4b29, 0x8a, 0x8e, 0xbe, 0x2c, \ | |
952 | 0x64, 0x90, 0xb8, 0x9d) | |
953 | #define CPER_SECTION_TYPE_DMESG \ | |
954 | UUID_LE(0xc197e04e, 0xd545, 0x4a70, 0x9c, 0x17, 0xa5, 0x54, \ | |
955 | 0x94, 0x19, 0xeb, 0x12) | |
901037ba AB |
956 | #define CPER_SECTION_TYPE_DMESG_Z \ |
957 | UUID_LE(0x4f118707, 0x04dd, 0x4055, 0xb5, 0xdd, 0x95, 0x6d, \ | |
958 | 0x34, 0xdd, 0xfa, 0xc6) | |
0bb77c46 TL |
959 | #define CPER_SECTION_TYPE_MCE \ |
960 | UUID_LE(0xfe08ffbe, 0x95e4, 0x4be7, 0xbc, 0x73, 0x40, 0x96, \ | |
961 | 0x04, 0x4a, 0x38, 0xfc) | |
962 | ||
963 | struct cper_pstore_record { | |
964 | struct cper_record_header hdr; | |
965 | struct cper_section_descriptor sec_hdr; | |
966 | char data[]; | |
967 | } __packed; | |
968 | ||
06cf91b4 CG |
969 | static int reader_pos; |
970 | ||
971 | static int erst_open_pstore(struct pstore_info *psi) | |
972 | { | |
973 | int rc; | |
974 | ||
975 | if (erst_disable) | |
976 | return -ENODEV; | |
977 | ||
978 | rc = erst_get_record_id_begin(&reader_pos); | |
979 | ||
980 | return rc; | |
981 | } | |
982 | ||
983 | static int erst_close_pstore(struct pstore_info *psi) | |
984 | { | |
985 | erst_get_record_id_end(); | |
986 | ||
987 | return 0; | |
988 | } | |
989 | ||
755d4fe4 | 990 | static ssize_t erst_reader(u64 *id, enum pstore_type_id *type, int *count, |
f6f82851 | 991 | struct timespec *time, char **buf, |
9a4e1398 | 992 | bool *compressed, struct pstore_info *psi) |
0bb77c46 TL |
993 | { |
994 | int rc; | |
06cf91b4 | 995 | ssize_t len = 0; |
0bb77c46 | 996 | u64 record_id; |
f6f82851 KC |
997 | struct cper_pstore_record *rcd; |
998 | size_t rcd_len = sizeof(*rcd) + erst_info.bufsize; | |
0bb77c46 TL |
999 | |
1000 | if (erst_disable) | |
1001 | return -ENODEV; | |
1002 | ||
f6f82851 KC |
1003 | rcd = kmalloc(rcd_len, GFP_KERNEL); |
1004 | if (!rcd) { | |
1005 | rc = -ENOMEM; | |
1006 | goto out; | |
1007 | } | |
0bb77c46 | 1008 | skip: |
06cf91b4 CG |
1009 | rc = erst_get_record_id_next(&reader_pos, &record_id); |
1010 | if (rc) | |
1011 | goto out; | |
1012 | ||
0bb77c46 TL |
1013 | /* no more record */ |
1014 | if (record_id == APEI_ERST_INVALID_RECORD_ID) { | |
f6f82851 | 1015 | rc = -EINVAL; |
06cf91b4 | 1016 | goto out; |
0bb77c46 TL |
1017 | } |
1018 | ||
f6f82851 | 1019 | len = erst_read(record_id, &rcd->hdr, rcd_len); |
f5ec25de CG |
1020 | /* The record may be cleared by others, try read next record */ |
1021 | if (len == -ENOENT) | |
1022 | goto skip; | |
f6f82851 KC |
1023 | else if (len < sizeof(*rcd)) { |
1024 | rc = -EIO; | |
f5ec25de CG |
1025 | goto out; |
1026 | } | |
0bb77c46 TL |
1027 | if (uuid_le_cmp(rcd->hdr.creator_id, CPER_CREATOR_PSTORE) != 0) |
1028 | goto skip; | |
0bb77c46 | 1029 | |
f6f82851 KC |
1030 | *buf = kmalloc(len, GFP_KERNEL); |
1031 | if (*buf == NULL) { | |
1032 | rc = -ENOMEM; | |
1033 | goto out; | |
1034 | } | |
1035 | memcpy(*buf, rcd->data, len - sizeof(*rcd)); | |
0bb77c46 | 1036 | *id = record_id; |
901037ba | 1037 | *compressed = false; |
0bb77c46 | 1038 | if (uuid_le_cmp(rcd->sec_hdr.section_type, |
901037ba AB |
1039 | CPER_SECTION_TYPE_DMESG_Z) == 0) { |
1040 | *type = PSTORE_TYPE_DMESG; | |
1041 | *compressed = true; | |
1042 | } else if (uuid_le_cmp(rcd->sec_hdr.section_type, | |
0bb77c46 TL |
1043 | CPER_SECTION_TYPE_DMESG) == 0) |
1044 | *type = PSTORE_TYPE_DMESG; | |
1045 | else if (uuid_le_cmp(rcd->sec_hdr.section_type, | |
1046 | CPER_SECTION_TYPE_MCE) == 0) | |
1047 | *type = PSTORE_TYPE_MCE; | |
1048 | else | |
1049 | *type = PSTORE_TYPE_UNKNOWN; | |
1050 | ||
1051 | if (rcd->hdr.validation_bits & CPER_VALID_TIMESTAMP) | |
1052 | time->tv_sec = rcd->hdr.timestamp; | |
1053 | else | |
1054 | time->tv_sec = 0; | |
1055 | time->tv_nsec = 0; | |
1056 | ||
06cf91b4 | 1057 | out: |
f6f82851 | 1058 | kfree(rcd); |
06cf91b4 | 1059 | return (rc < 0) ? rc : (len - sizeof(*rcd)); |
0bb77c46 TL |
1060 | } |
1061 | ||
3d6d8d20 | 1062 | static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason, |
b3b515bb | 1063 | u64 *id, unsigned int part, int count, bool compressed, |
b94fdd07 | 1064 | size_t size, struct pstore_info *psi) |
0bb77c46 TL |
1065 | { |
1066 | struct cper_pstore_record *rcd = (struct cper_pstore_record *) | |
1067 | (erst_info.buf - sizeof(*rcd)); | |
b238b8fa | 1068 | int ret; |
0bb77c46 TL |
1069 | |
1070 | memset(rcd, 0, sizeof(*rcd)); | |
1071 | memcpy(rcd->hdr.signature, CPER_SIG_RECORD, CPER_SIG_SIZE); | |
1072 | rcd->hdr.revision = CPER_RECORD_REV; | |
1073 | rcd->hdr.signature_end = CPER_SIG_END; | |
1074 | rcd->hdr.section_count = 1; | |
1075 | rcd->hdr.error_severity = CPER_SEV_FATAL; | |
1076 | /* timestamp valid. platform_id, partition_id are invalid */ | |
1077 | rcd->hdr.validation_bits = CPER_VALID_TIMESTAMP; | |
1078 | rcd->hdr.timestamp = get_seconds(); | |
1079 | rcd->hdr.record_length = sizeof(*rcd) + size; | |
1080 | rcd->hdr.creator_id = CPER_CREATOR_PSTORE; | |
1081 | rcd->hdr.notification_type = CPER_NOTIFY_MCE; | |
1082 | rcd->hdr.record_id = cper_next_record_id(); | |
1083 | rcd->hdr.flags = CPER_HW_ERROR_FLAGS_PREVERR; | |
1084 | ||
1085 | rcd->sec_hdr.section_offset = sizeof(*rcd); | |
1086 | rcd->sec_hdr.section_length = size; | |
1087 | rcd->sec_hdr.revision = CPER_SEC_REV; | |
1088 | /* fru_id and fru_text is invalid */ | |
1089 | rcd->sec_hdr.validation_bits = 0; | |
1090 | rcd->sec_hdr.flags = CPER_SEC_PRIMARY; | |
1091 | switch (type) { | |
1092 | case PSTORE_TYPE_DMESG: | |
901037ba AB |
1093 | if (compressed) |
1094 | rcd->sec_hdr.section_type = CPER_SECTION_TYPE_DMESG_Z; | |
1095 | else | |
1096 | rcd->sec_hdr.section_type = CPER_SECTION_TYPE_DMESG; | |
0bb77c46 TL |
1097 | break; |
1098 | case PSTORE_TYPE_MCE: | |
1099 | rcd->sec_hdr.section_type = CPER_SECTION_TYPE_MCE; | |
1100 | break; | |
1101 | default: | |
1102 | return -EINVAL; | |
1103 | } | |
1104 | rcd->sec_hdr.section_severity = CPER_SEV_FATAL; | |
1105 | ||
b238b8fa CG |
1106 | ret = erst_write(&rcd->hdr); |
1107 | *id = rcd->hdr.record_id; | |
0bb77c46 | 1108 | |
b238b8fa | 1109 | return ret; |
0bb77c46 TL |
1110 | } |
1111 | ||
755d4fe4 | 1112 | static int erst_clearer(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 1113 | struct timespec time, struct pstore_info *psi) |
638c1fd3 MG |
1114 | { |
1115 | return erst_clear(id); | |
1116 | } | |
1117 | ||
a08f82d0 HY |
1118 | static int __init erst_init(void) |
1119 | { | |
1120 | int rc = 0; | |
1121 | acpi_status status; | |
1122 | struct apei_exec_context ctx; | |
1123 | struct apei_resources erst_resources; | |
1124 | struct resource *r; | |
0bb77c46 | 1125 | char *buf; |
a08f82d0 HY |
1126 | |
1127 | if (acpi_disabled) | |
1128 | goto err; | |
1129 | ||
1130 | if (erst_disable) { | |
cb82a2e4 | 1131 | pr_info( |
a08f82d0 HY |
1132 | "Error Record Serialization Table (ERST) support is disabled.\n"); |
1133 | goto err; | |
1134 | } | |
1135 | ||
1136 | status = acpi_get_table(ACPI_SIG_ERST, 0, | |
1137 | (struct acpi_table_header **)&erst_tab); | |
ad686154 | 1138 | if (status == AE_NOT_FOUND) |
a08f82d0 | 1139 | goto err; |
ad686154 | 1140 | else if (ACPI_FAILURE(status)) { |
a08f82d0 | 1141 | const char *msg = acpi_format_exception(status); |
cb82a2e4 | 1142 | pr_err("Failed to get table, %s\n", msg); |
a08f82d0 HY |
1143 | rc = -EINVAL; |
1144 | goto err; | |
1145 | } | |
1146 | ||
1147 | rc = erst_check_table(erst_tab); | |
1148 | if (rc) { | |
cb82a2e4 | 1149 | pr_err(FW_BUG "ERST table is invalid.\n"); |
a08f82d0 HY |
1150 | goto err; |
1151 | } | |
1152 | ||
1153 | apei_resources_init(&erst_resources); | |
1154 | erst_exec_ctx_init(&ctx); | |
1155 | rc = apei_exec_collect_resources(&ctx, &erst_resources); | |
1156 | if (rc) | |
1157 | goto err_fini; | |
1158 | rc = apei_resources_request(&erst_resources, "APEI ERST"); | |
1159 | if (rc) | |
1160 | goto err_fini; | |
1161 | rc = apei_exec_pre_map_gars(&ctx); | |
1162 | if (rc) | |
1163 | goto err_release; | |
1164 | rc = erst_get_erange(&erst_erange); | |
1165 | if (rc) { | |
1166 | if (rc == -ENODEV) | |
cb82a2e4 | 1167 | pr_info( |
a08f82d0 HY |
1168 | "The corresponding hardware device or firmware implementation " |
1169 | "is not available.\n"); | |
1170 | else | |
cb82a2e4 | 1171 | pr_err("Failed to get Error Log Address Range.\n"); |
a08f82d0 HY |
1172 | goto err_unmap_reg; |
1173 | } | |
1174 | ||
1175 | r = request_mem_region(erst_erange.base, erst_erange.size, "APEI ERST"); | |
1176 | if (!r) { | |
cb82a2e4 BP |
1177 | pr_err("Can not request [mem %#010llx-%#010llx] for ERST.\n", |
1178 | (unsigned long long)erst_erange.base, | |
1179 | (unsigned long long)erst_erange.base + erst_erange.size - 1); | |
a08f82d0 HY |
1180 | rc = -EIO; |
1181 | goto err_unmap_reg; | |
1182 | } | |
1183 | rc = -ENOMEM; | |
1184 | erst_erange.vaddr = ioremap_cache(erst_erange.base, | |
1185 | erst_erange.size); | |
1186 | if (!erst_erange.vaddr) | |
1187 | goto err_release_erange; | |
1188 | ||
cb82a2e4 | 1189 | pr_info( |
74fd6c6f LS |
1190 | "Error Record Serialization Table (ERST) support is initialized.\n"); |
1191 | ||
0bb77c46 | 1192 | buf = kmalloc(erst_erange.size, GFP_KERNEL); |
abd4d558 | 1193 | spin_lock_init(&erst_info.buf_lock); |
0bb77c46 TL |
1194 | if (buf) { |
1195 | erst_info.buf = buf + sizeof(struct cper_pstore_record); | |
1196 | erst_info.bufsize = erst_erange.size - | |
1197 | sizeof(struct cper_pstore_record); | |
74fd6c6f LS |
1198 | rc = pstore_register(&erst_info); |
1199 | if (rc) { | |
1200 | if (rc != -EPERM) | |
cb82a2e4 BP |
1201 | pr_info( |
1202 | "Could not register with persistent store.\n"); | |
74fd6c6f LS |
1203 | erst_info.buf = NULL; |
1204 | erst_info.bufsize = 0; | |
0bb77c46 TL |
1205 | kfree(buf); |
1206 | } | |
74fd6c6f | 1207 | } else |
cb82a2e4 BP |
1208 | pr_err( |
1209 | "Failed to allocate %lld bytes for persistent store error log.\n", | |
74fd6c6f | 1210 | erst_erange.size); |
a08f82d0 HY |
1211 | |
1212 | return 0; | |
1213 | ||
1214 | err_release_erange: | |
1215 | release_mem_region(erst_erange.base, erst_erange.size); | |
1216 | err_unmap_reg: | |
1217 | apei_exec_post_unmap_gars(&ctx); | |
1218 | err_release: | |
1219 | apei_resources_release(&erst_resources); | |
1220 | err_fini: | |
1221 | apei_resources_fini(&erst_resources); | |
1222 | err: | |
1223 | erst_disable = 1; | |
1224 | return rc; | |
1225 | } | |
1226 | ||
1227 | device_initcall(erst_init); |