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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. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
25 | */ | |
26 | ||
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/io.h> | |
32 | #include <linux/acpi.h> | |
33 | #include <linux/uaccess.h> | |
34 | #include <linux/cper.h> | |
35 | #include <linux/nmi.h> | |
0a7992c9 | 36 | #include <linux/hardirq.h> |
0bb77c46 | 37 | #include <linux/pstore.h> |
a08f82d0 HY |
38 | #include <acpi/apei.h> |
39 | ||
40 | #include "apei-internal.h" | |
41 | ||
42 | #define ERST_PFX "ERST: " | |
43 | ||
44 | /* ERST command status */ | |
45 | #define ERST_STATUS_SUCCESS 0x0 | |
46 | #define ERST_STATUS_NOT_ENOUGH_SPACE 0x1 | |
47 | #define ERST_STATUS_HARDWARE_NOT_AVAILABLE 0x2 | |
48 | #define ERST_STATUS_FAILED 0x3 | |
49 | #define ERST_STATUS_RECORD_STORE_EMPTY 0x4 | |
50 | #define ERST_STATUS_RECORD_NOT_FOUND 0x5 | |
51 | ||
52 | #define ERST_TAB_ENTRY(tab) \ | |
53 | ((struct acpi_whea_header *)((char *)(tab) + \ | |
54 | sizeof(struct acpi_table_erst))) | |
55 | ||
56 | #define SPIN_UNIT 100 /* 100ns */ | |
e8a8b252 | 57 | /* Firmware should respond within 1 milliseconds */ |
a08f82d0 HY |
58 | #define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC) |
59 | #define FIRMWARE_MAX_STALL 50 /* 50us */ | |
60 | ||
61 | int erst_disable; | |
62 | EXPORT_SYMBOL_GPL(erst_disable); | |
63 | ||
64 | static struct acpi_table_erst *erst_tab; | |
65 | ||
66 | /* ERST Error Log Address Range atrributes */ | |
67 | #define ERST_RANGE_RESERVED 0x0001 | |
68 | #define ERST_RANGE_NVRAM 0x0002 | |
69 | #define ERST_RANGE_SLOW 0x0004 | |
70 | ||
71 | /* | |
72 | * ERST Error Log Address Range, used as buffer for reading/writing | |
73 | * error records. | |
74 | */ | |
75 | static struct erst_erange { | |
76 | u64 base; | |
77 | u64 size; | |
78 | void __iomem *vaddr; | |
79 | u32 attr; | |
80 | } erst_erange; | |
81 | ||
82 | /* | |
83 | * Prevent ERST interpreter to run simultaneously, because the | |
84 | * corresponding firmware implementation may not work properly when | |
85 | * invoked simultaneously. | |
86 | * | |
87 | * It is used to provide exclusive accessing for ERST Error Log | |
88 | * Address Range too. | |
89 | */ | |
3b38bb5f | 90 | static DEFINE_RAW_SPINLOCK(erst_lock); |
a08f82d0 HY |
91 | |
92 | static inline int erst_errno(int command_status) | |
93 | { | |
94 | switch (command_status) { | |
95 | case ERST_STATUS_SUCCESS: | |
96 | return 0; | |
97 | case ERST_STATUS_HARDWARE_NOT_AVAILABLE: | |
98 | return -ENODEV; | |
99 | case ERST_STATUS_NOT_ENOUGH_SPACE: | |
100 | return -ENOSPC; | |
101 | case ERST_STATUS_RECORD_STORE_EMPTY: | |
102 | case ERST_STATUS_RECORD_NOT_FOUND: | |
103 | return -ENOENT; | |
104 | default: | |
105 | return -EINVAL; | |
106 | } | |
107 | } | |
108 | ||
109 | static int erst_timedout(u64 *t, u64 spin_unit) | |
110 | { | |
111 | if ((s64)*t < spin_unit) { | |
112 | pr_warning(FW_WARN ERST_PFX | |
113 | "Firmware does not respond in time\n"); | |
114 | return 1; | |
115 | } | |
116 | *t -= spin_unit; | |
117 | ndelay(spin_unit); | |
118 | touch_nmi_watchdog(); | |
119 | return 0; | |
120 | } | |
121 | ||
122 | static int erst_exec_load_var1(struct apei_exec_context *ctx, | |
123 | struct acpi_whea_header *entry) | |
124 | { | |
125 | return __apei_exec_read_register(entry, &ctx->var1); | |
126 | } | |
127 | ||
128 | static int erst_exec_load_var2(struct apei_exec_context *ctx, | |
129 | struct acpi_whea_header *entry) | |
130 | { | |
131 | return __apei_exec_read_register(entry, &ctx->var2); | |
132 | } | |
133 | ||
134 | static int erst_exec_store_var1(struct apei_exec_context *ctx, | |
135 | struct acpi_whea_header *entry) | |
136 | { | |
137 | return __apei_exec_write_register(entry, ctx->var1); | |
138 | } | |
139 | ||
140 | static int erst_exec_add(struct apei_exec_context *ctx, | |
141 | struct acpi_whea_header *entry) | |
142 | { | |
143 | ctx->var1 += ctx->var2; | |
144 | return 0; | |
145 | } | |
146 | ||
147 | static int erst_exec_subtract(struct apei_exec_context *ctx, | |
148 | struct acpi_whea_header *entry) | |
149 | { | |
150 | ctx->var1 -= ctx->var2; | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static int erst_exec_add_value(struct apei_exec_context *ctx, | |
155 | struct acpi_whea_header *entry) | |
156 | { | |
157 | int rc; | |
158 | u64 val; | |
159 | ||
160 | rc = __apei_exec_read_register(entry, &val); | |
161 | if (rc) | |
162 | return rc; | |
163 | val += ctx->value; | |
164 | rc = __apei_exec_write_register(entry, val); | |
165 | return rc; | |
166 | } | |
167 | ||
168 | static int erst_exec_subtract_value(struct apei_exec_context *ctx, | |
169 | struct acpi_whea_header *entry) | |
170 | { | |
171 | int rc; | |
172 | u64 val; | |
173 | ||
174 | rc = __apei_exec_read_register(entry, &val); | |
175 | if (rc) | |
176 | return rc; | |
177 | val -= ctx->value; | |
178 | rc = __apei_exec_write_register(entry, val); | |
179 | return rc; | |
180 | } | |
181 | ||
182 | static int erst_exec_stall(struct apei_exec_context *ctx, | |
183 | struct acpi_whea_header *entry) | |
184 | { | |
185 | u64 stall_time; | |
186 | ||
187 | if (ctx->value > FIRMWARE_MAX_STALL) { | |
188 | if (!in_nmi()) | |
189 | pr_warning(FW_WARN ERST_PFX | |
190 | "Too long stall time for stall instruction: %llx.\n", | |
191 | ctx->value); | |
192 | stall_time = FIRMWARE_MAX_STALL; | |
193 | } else | |
194 | stall_time = ctx->value; | |
195 | udelay(stall_time); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static int erst_exec_stall_while_true(struct apei_exec_context *ctx, | |
200 | struct acpi_whea_header *entry) | |
201 | { | |
202 | int rc; | |
203 | u64 val; | |
204 | u64 timeout = FIRMWARE_TIMEOUT; | |
205 | u64 stall_time; | |
206 | ||
207 | if (ctx->var1 > FIRMWARE_MAX_STALL) { | |
208 | if (!in_nmi()) | |
209 | pr_warning(FW_WARN ERST_PFX | |
210 | "Too long stall time for stall while true instruction: %llx.\n", | |
211 | ctx->var1); | |
212 | stall_time = FIRMWARE_MAX_STALL; | |
213 | } else | |
214 | stall_time = ctx->var1; | |
215 | ||
216 | for (;;) { | |
217 | rc = __apei_exec_read_register(entry, &val); | |
218 | if (rc) | |
219 | return rc; | |
220 | if (val != ctx->value) | |
221 | break; | |
222 | if (erst_timedout(&timeout, stall_time * NSEC_PER_USEC)) | |
223 | return -EIO; | |
224 | } | |
225 | return 0; | |
226 | } | |
227 | ||
228 | static int erst_exec_skip_next_instruction_if_true( | |
229 | struct apei_exec_context *ctx, | |
230 | struct acpi_whea_header *entry) | |
231 | { | |
232 | int rc; | |
233 | u64 val; | |
234 | ||
235 | rc = __apei_exec_read_register(entry, &val); | |
236 | if (rc) | |
237 | return rc; | |
238 | if (val == ctx->value) { | |
239 | ctx->ip += 2; | |
240 | return APEI_EXEC_SET_IP; | |
241 | } | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | static int erst_exec_goto(struct apei_exec_context *ctx, | |
247 | struct acpi_whea_header *entry) | |
248 | { | |
249 | ctx->ip = ctx->value; | |
250 | return APEI_EXEC_SET_IP; | |
251 | } | |
252 | ||
253 | static int erst_exec_set_src_address_base(struct apei_exec_context *ctx, | |
254 | struct acpi_whea_header *entry) | |
255 | { | |
256 | return __apei_exec_read_register(entry, &ctx->src_base); | |
257 | } | |
258 | ||
259 | static int erst_exec_set_dst_address_base(struct apei_exec_context *ctx, | |
260 | struct acpi_whea_header *entry) | |
261 | { | |
262 | return __apei_exec_read_register(entry, &ctx->dst_base); | |
263 | } | |
264 | ||
265 | static int erst_exec_move_data(struct apei_exec_context *ctx, | |
266 | struct acpi_whea_header *entry) | |
267 | { | |
268 | int rc; | |
269 | u64 offset; | |
0bbba38a HY |
270 | void *src, *dst; |
271 | ||
272 | /* ioremap does not work in interrupt context */ | |
273 | if (in_interrupt()) { | |
274 | pr_warning(ERST_PFX | |
275 | "MOVE_DATA can not be used in interrupt context"); | |
276 | return -EBUSY; | |
277 | } | |
a08f82d0 HY |
278 | |
279 | rc = __apei_exec_read_register(entry, &offset); | |
280 | if (rc) | |
281 | return rc; | |
0bbba38a HY |
282 | |
283 | src = ioremap(ctx->src_base + offset, ctx->var2); | |
284 | if (!src) | |
285 | return -ENOMEM; | |
286 | dst = ioremap(ctx->dst_base + offset, ctx->var2); | |
287 | if (!dst) | |
288 | return -ENOMEM; | |
289 | ||
290 | memmove(dst, src, ctx->var2); | |
291 | ||
292 | iounmap(src); | |
293 | iounmap(dst); | |
a08f82d0 HY |
294 | |
295 | return 0; | |
296 | } | |
297 | ||
298 | static struct apei_exec_ins_type erst_ins_type[] = { | |
299 | [ACPI_ERST_READ_REGISTER] = { | |
300 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
301 | .run = apei_exec_read_register, | |
302 | }, | |
303 | [ACPI_ERST_READ_REGISTER_VALUE] = { | |
304 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
305 | .run = apei_exec_read_register_value, | |
306 | }, | |
307 | [ACPI_ERST_WRITE_REGISTER] = { | |
308 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
309 | .run = apei_exec_write_register, | |
310 | }, | |
311 | [ACPI_ERST_WRITE_REGISTER_VALUE] = { | |
312 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
313 | .run = apei_exec_write_register_value, | |
314 | }, | |
315 | [ACPI_ERST_NOOP] = { | |
316 | .flags = 0, | |
317 | .run = apei_exec_noop, | |
318 | }, | |
319 | [ACPI_ERST_LOAD_VAR1] = { | |
320 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
321 | .run = erst_exec_load_var1, | |
322 | }, | |
323 | [ACPI_ERST_LOAD_VAR2] = { | |
324 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
325 | .run = erst_exec_load_var2, | |
326 | }, | |
327 | [ACPI_ERST_STORE_VAR1] = { | |
328 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
329 | .run = erst_exec_store_var1, | |
330 | }, | |
331 | [ACPI_ERST_ADD] = { | |
332 | .flags = 0, | |
333 | .run = erst_exec_add, | |
334 | }, | |
335 | [ACPI_ERST_SUBTRACT] = { | |
336 | .flags = 0, | |
337 | .run = erst_exec_subtract, | |
338 | }, | |
339 | [ACPI_ERST_ADD_VALUE] = { | |
340 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
341 | .run = erst_exec_add_value, | |
342 | }, | |
343 | [ACPI_ERST_SUBTRACT_VALUE] = { | |
344 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
345 | .run = erst_exec_subtract_value, | |
346 | }, | |
347 | [ACPI_ERST_STALL] = { | |
348 | .flags = 0, | |
349 | .run = erst_exec_stall, | |
350 | }, | |
351 | [ACPI_ERST_STALL_WHILE_TRUE] = { | |
352 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
353 | .run = erst_exec_stall_while_true, | |
354 | }, | |
355 | [ACPI_ERST_SKIP_NEXT_IF_TRUE] = { | |
356 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
357 | .run = erst_exec_skip_next_instruction_if_true, | |
358 | }, | |
359 | [ACPI_ERST_GOTO] = { | |
360 | .flags = 0, | |
361 | .run = erst_exec_goto, | |
362 | }, | |
363 | [ACPI_ERST_SET_SRC_ADDRESS_BASE] = { | |
364 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
365 | .run = erst_exec_set_src_address_base, | |
366 | }, | |
367 | [ACPI_ERST_SET_DST_ADDRESS_BASE] = { | |
368 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
369 | .run = erst_exec_set_dst_address_base, | |
370 | }, | |
371 | [ACPI_ERST_MOVE_DATA] = { | |
372 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
373 | .run = erst_exec_move_data, | |
374 | }, | |
375 | }; | |
376 | ||
377 | static inline void erst_exec_ctx_init(struct apei_exec_context *ctx) | |
378 | { | |
379 | apei_exec_ctx_init(ctx, erst_ins_type, ARRAY_SIZE(erst_ins_type), | |
380 | ERST_TAB_ENTRY(erst_tab), erst_tab->entries); | |
381 | } | |
382 | ||
383 | static int erst_get_erange(struct erst_erange *range) | |
384 | { | |
385 | struct apei_exec_context ctx; | |
386 | int rc; | |
387 | ||
388 | erst_exec_ctx_init(&ctx); | |
389 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_RANGE); | |
390 | if (rc) | |
391 | return rc; | |
392 | range->base = apei_exec_ctx_get_output(&ctx); | |
393 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_LENGTH); | |
394 | if (rc) | |
395 | return rc; | |
396 | range->size = apei_exec_ctx_get_output(&ctx); | |
397 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_ATTRIBUTES); | |
398 | if (rc) | |
399 | return rc; | |
400 | range->attr = apei_exec_ctx_get_output(&ctx); | |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
405 | static ssize_t __erst_get_record_count(void) | |
406 | { | |
407 | struct apei_exec_context ctx; | |
408 | int rc; | |
409 | ||
410 | erst_exec_ctx_init(&ctx); | |
411 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_RECORD_COUNT); | |
412 | if (rc) | |
413 | return rc; | |
414 | return apei_exec_ctx_get_output(&ctx); | |
415 | } | |
416 | ||
417 | ssize_t erst_get_record_count(void) | |
418 | { | |
419 | ssize_t count; | |
420 | unsigned long flags; | |
421 | ||
422 | if (erst_disable) | |
423 | return -ENODEV; | |
424 | ||
3b38bb5f | 425 | raw_spin_lock_irqsave(&erst_lock, flags); |
a08f82d0 | 426 | count = __erst_get_record_count(); |
3b38bb5f | 427 | raw_spin_unlock_irqrestore(&erst_lock, flags); |
a08f82d0 HY |
428 | |
429 | return count; | |
430 | } | |
431 | EXPORT_SYMBOL_GPL(erst_get_record_count); | |
432 | ||
885b976f HY |
433 | #define ERST_RECORD_ID_CACHE_SIZE_MIN 16 |
434 | #define ERST_RECORD_ID_CACHE_SIZE_MAX 1024 | |
435 | ||
436 | struct erst_record_id_cache { | |
437 | struct mutex lock; | |
438 | u64 *entries; | |
439 | int len; | |
440 | int size; | |
441 | int refcount; | |
442 | }; | |
443 | ||
444 | static struct erst_record_id_cache erst_record_id_cache = { | |
445 | .lock = __MUTEX_INITIALIZER(erst_record_id_cache.lock), | |
446 | .refcount = 0, | |
447 | }; | |
448 | ||
a08f82d0 HY |
449 | static int __erst_get_next_record_id(u64 *record_id) |
450 | { | |
451 | struct apei_exec_context ctx; | |
452 | int rc; | |
453 | ||
454 | erst_exec_ctx_init(&ctx); | |
455 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_RECORD_ID); | |
456 | if (rc) | |
457 | return rc; | |
458 | *record_id = apei_exec_ctx_get_output(&ctx); | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
885b976f HY |
463 | int erst_get_record_id_begin(int *pos) |
464 | { | |
465 | int rc; | |
466 | ||
467 | if (erst_disable) | |
468 | return -ENODEV; | |
469 | ||
470 | rc = mutex_lock_interruptible(&erst_record_id_cache.lock); | |
471 | if (rc) | |
472 | return rc; | |
473 | erst_record_id_cache.refcount++; | |
474 | mutex_unlock(&erst_record_id_cache.lock); | |
475 | ||
476 | *pos = 0; | |
477 | ||
478 | return 0; | |
479 | } | |
480 | EXPORT_SYMBOL_GPL(erst_get_record_id_begin); | |
481 | ||
482 | /* erst_record_id_cache.lock must be held by caller */ | |
483 | static int __erst_record_id_cache_add_one(void) | |
484 | { | |
485 | u64 id, prev_id, first_id; | |
486 | int i, rc; | |
487 | u64 *entries; | |
488 | unsigned long flags; | |
489 | ||
490 | id = prev_id = first_id = APEI_ERST_INVALID_RECORD_ID; | |
491 | retry: | |
492 | raw_spin_lock_irqsave(&erst_lock, flags); | |
493 | rc = __erst_get_next_record_id(&id); | |
494 | raw_spin_unlock_irqrestore(&erst_lock, flags); | |
495 | if (rc == -ENOENT) | |
496 | return 0; | |
497 | if (rc) | |
498 | return rc; | |
499 | if (id == APEI_ERST_INVALID_RECORD_ID) | |
500 | return 0; | |
501 | /* can not skip current ID, or loop back to first ID */ | |
502 | if (id == prev_id || id == first_id) | |
503 | return 0; | |
504 | if (first_id == APEI_ERST_INVALID_RECORD_ID) | |
505 | first_id = id; | |
506 | prev_id = id; | |
507 | ||
508 | entries = erst_record_id_cache.entries; | |
509 | for (i = 0; i < erst_record_id_cache.len; i++) { | |
510 | if (entries[i] == id) | |
511 | break; | |
512 | } | |
513 | /* record id already in cache, try next */ | |
514 | if (i < erst_record_id_cache.len) | |
515 | goto retry; | |
516 | if (erst_record_id_cache.len >= erst_record_id_cache.size) { | |
517 | int new_size, alloc_size; | |
518 | u64 *new_entries; | |
519 | ||
520 | new_size = erst_record_id_cache.size * 2; | |
521 | new_size = clamp_val(new_size, ERST_RECORD_ID_CACHE_SIZE_MIN, | |
522 | ERST_RECORD_ID_CACHE_SIZE_MAX); | |
523 | if (new_size <= erst_record_id_cache.size) { | |
524 | if (printk_ratelimit()) | |
525 | pr_warning(FW_WARN ERST_PFX | |
526 | "too many record ID!\n"); | |
527 | return 0; | |
528 | } | |
529 | alloc_size = new_size * sizeof(entries[0]); | |
530 | if (alloc_size < PAGE_SIZE) | |
531 | new_entries = kmalloc(alloc_size, GFP_KERNEL); | |
532 | else | |
533 | new_entries = vmalloc(alloc_size); | |
534 | if (!new_entries) | |
535 | return -ENOMEM; | |
536 | memcpy(new_entries, entries, | |
537 | erst_record_id_cache.len * sizeof(entries[0])); | |
538 | if (erst_record_id_cache.size < PAGE_SIZE) | |
539 | kfree(entries); | |
540 | else | |
541 | vfree(entries); | |
542 | erst_record_id_cache.entries = entries = new_entries; | |
543 | erst_record_id_cache.size = new_size; | |
544 | } | |
545 | entries[i] = id; | |
546 | erst_record_id_cache.len++; | |
547 | ||
548 | return 1; | |
549 | } | |
550 | ||
a08f82d0 HY |
551 | /* |
552 | * Get the record ID of an existing error record on the persistent | |
553 | * storage. If there is no error record on the persistent storage, the | |
554 | * returned record_id is APEI_ERST_INVALID_RECORD_ID. | |
555 | */ | |
885b976f | 556 | int erst_get_record_id_next(int *pos, u64 *record_id) |
a08f82d0 | 557 | { |
885b976f HY |
558 | int rc = 0; |
559 | u64 *entries; | |
a08f82d0 HY |
560 | |
561 | if (erst_disable) | |
562 | return -ENODEV; | |
563 | ||
885b976f HY |
564 | /* must be enclosed by erst_get_record_id_begin/end */ |
565 | BUG_ON(!erst_record_id_cache.refcount); | |
566 | BUG_ON(*pos < 0 || *pos > erst_record_id_cache.len); | |
567 | ||
568 | mutex_lock(&erst_record_id_cache.lock); | |
569 | entries = erst_record_id_cache.entries; | |
570 | for (; *pos < erst_record_id_cache.len; (*pos)++) | |
571 | if (entries[*pos] != APEI_ERST_INVALID_RECORD_ID) | |
572 | break; | |
573 | /* found next record id in cache */ | |
574 | if (*pos < erst_record_id_cache.len) { | |
575 | *record_id = entries[*pos]; | |
576 | (*pos)++; | |
577 | goto out_unlock; | |
578 | } | |
579 | ||
580 | /* Try to add one more record ID to cache */ | |
581 | rc = __erst_record_id_cache_add_one(); | |
582 | if (rc < 0) | |
583 | goto out_unlock; | |
584 | /* successfully add one new ID */ | |
585 | if (rc == 1) { | |
586 | *record_id = erst_record_id_cache.entries[*pos]; | |
587 | (*pos)++; | |
588 | rc = 0; | |
589 | } else { | |
590 | *pos = -1; | |
591 | *record_id = APEI_ERST_INVALID_RECORD_ID; | |
592 | } | |
593 | out_unlock: | |
594 | mutex_unlock(&erst_record_id_cache.lock); | |
a08f82d0 HY |
595 | |
596 | return rc; | |
597 | } | |
885b976f HY |
598 | EXPORT_SYMBOL_GPL(erst_get_record_id_next); |
599 | ||
600 | /* erst_record_id_cache.lock must be held by caller */ | |
601 | static void __erst_record_id_cache_compact(void) | |
602 | { | |
603 | int i, wpos = 0; | |
604 | u64 *entries; | |
605 | ||
606 | if (erst_record_id_cache.refcount) | |
607 | return; | |
608 | ||
609 | entries = erst_record_id_cache.entries; | |
610 | for (i = 0; i < erst_record_id_cache.len; i++) { | |
611 | if (entries[i] == APEI_ERST_INVALID_RECORD_ID) | |
612 | continue; | |
613 | if (wpos != i) | |
614 | memcpy(&entries[wpos], &entries[i], sizeof(entries[i])); | |
615 | wpos++; | |
616 | } | |
617 | erst_record_id_cache.len = wpos; | |
618 | } | |
619 | ||
620 | void erst_get_record_id_end(void) | |
621 | { | |
622 | /* | |
623 | * erst_disable != 0 should be detected by invoker via the | |
624 | * return value of erst_get_record_id_begin/next, so this | |
625 | * function should not be called for erst_disable != 0. | |
626 | */ | |
627 | BUG_ON(erst_disable); | |
628 | ||
629 | mutex_lock(&erst_record_id_cache.lock); | |
630 | erst_record_id_cache.refcount--; | |
631 | BUG_ON(erst_record_id_cache.refcount < 0); | |
632 | __erst_record_id_cache_compact(); | |
633 | mutex_unlock(&erst_record_id_cache.lock); | |
634 | } | |
635 | EXPORT_SYMBOL_GPL(erst_get_record_id_end); | |
a08f82d0 HY |
636 | |
637 | static int __erst_write_to_storage(u64 offset) | |
638 | { | |
639 | struct apei_exec_context ctx; | |
640 | u64 timeout = FIRMWARE_TIMEOUT; | |
641 | u64 val; | |
642 | int rc; | |
643 | ||
644 | erst_exec_ctx_init(&ctx); | |
645 | rc = apei_exec_run(&ctx, ACPI_ERST_BEGIN_WRITE); | |
646 | if (rc) | |
647 | return rc; | |
648 | apei_exec_ctx_set_input(&ctx, offset); | |
649 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_OFFSET); | |
650 | if (rc) | |
651 | return rc; | |
652 | rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION); | |
653 | if (rc) | |
654 | return rc; | |
655 | for (;;) { | |
656 | rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS); | |
657 | if (rc) | |
658 | return rc; | |
659 | val = apei_exec_ctx_get_output(&ctx); | |
660 | if (!val) | |
661 | break; | |
662 | if (erst_timedout(&timeout, SPIN_UNIT)) | |
663 | return -EIO; | |
664 | } | |
665 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS); | |
666 | if (rc) | |
667 | return rc; | |
668 | val = apei_exec_ctx_get_output(&ctx); | |
669 | rc = apei_exec_run(&ctx, ACPI_ERST_END); | |
670 | if (rc) | |
671 | return rc; | |
672 | ||
673 | return erst_errno(val); | |
674 | } | |
675 | ||
676 | static int __erst_read_from_storage(u64 record_id, u64 offset) | |
677 | { | |
678 | struct apei_exec_context ctx; | |
679 | u64 timeout = FIRMWARE_TIMEOUT; | |
680 | u64 val; | |
681 | int rc; | |
682 | ||
683 | erst_exec_ctx_init(&ctx); | |
684 | rc = apei_exec_run(&ctx, ACPI_ERST_BEGIN_READ); | |
685 | if (rc) | |
686 | return rc; | |
687 | apei_exec_ctx_set_input(&ctx, offset); | |
688 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_OFFSET); | |
689 | if (rc) | |
690 | return rc; | |
691 | apei_exec_ctx_set_input(&ctx, record_id); | |
692 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_ID); | |
693 | if (rc) | |
694 | return rc; | |
695 | rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION); | |
696 | if (rc) | |
697 | return rc; | |
698 | for (;;) { | |
699 | rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS); | |
700 | if (rc) | |
701 | return rc; | |
702 | val = apei_exec_ctx_get_output(&ctx); | |
703 | if (!val) | |
704 | break; | |
705 | if (erst_timedout(&timeout, SPIN_UNIT)) | |
706 | return -EIO; | |
707 | }; | |
708 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS); | |
709 | if (rc) | |
710 | return rc; | |
711 | val = apei_exec_ctx_get_output(&ctx); | |
712 | rc = apei_exec_run(&ctx, ACPI_ERST_END); | |
713 | if (rc) | |
714 | return rc; | |
715 | ||
716 | return erst_errno(val); | |
717 | } | |
718 | ||
719 | static int __erst_clear_from_storage(u64 record_id) | |
720 | { | |
721 | struct apei_exec_context ctx; | |
722 | u64 timeout = FIRMWARE_TIMEOUT; | |
723 | u64 val; | |
724 | int rc; | |
725 | ||
726 | erst_exec_ctx_init(&ctx); | |
727 | rc = apei_exec_run(&ctx, ACPI_ERST_BEGIN_CLEAR); | |
728 | if (rc) | |
729 | return rc; | |
730 | apei_exec_ctx_set_input(&ctx, record_id); | |
731 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_ID); | |
732 | if (rc) | |
733 | return rc; | |
734 | rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION); | |
735 | if (rc) | |
736 | return rc; | |
737 | for (;;) { | |
738 | rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS); | |
739 | if (rc) | |
740 | return rc; | |
741 | val = apei_exec_ctx_get_output(&ctx); | |
742 | if (!val) | |
743 | break; | |
744 | if (erst_timedout(&timeout, SPIN_UNIT)) | |
745 | return -EIO; | |
746 | } | |
747 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS); | |
748 | if (rc) | |
749 | return rc; | |
750 | val = apei_exec_ctx_get_output(&ctx); | |
751 | rc = apei_exec_run(&ctx, ACPI_ERST_END); | |
752 | if (rc) | |
753 | return rc; | |
754 | ||
755 | return erst_errno(val); | |
756 | } | |
757 | ||
758 | /* NVRAM ERST Error Log Address Range is not supported yet */ | |
759 | static void pr_unimpl_nvram(void) | |
760 | { | |
761 | if (printk_ratelimit()) | |
762 | pr_warning(ERST_PFX | |
763 | "NVRAM ERST Log Address Range is not implemented yet\n"); | |
764 | } | |
765 | ||
766 | static int __erst_write_to_nvram(const struct cper_record_header *record) | |
767 | { | |
768 | /* do not print message, because printk is not safe for NMI */ | |
769 | return -ENOSYS; | |
770 | } | |
771 | ||
772 | static int __erst_read_to_erange_from_nvram(u64 record_id, u64 *offset) | |
773 | { | |
774 | pr_unimpl_nvram(); | |
775 | return -ENOSYS; | |
776 | } | |
777 | ||
778 | static int __erst_clear_from_nvram(u64 record_id) | |
779 | { | |
780 | pr_unimpl_nvram(); | |
781 | return -ENOSYS; | |
782 | } | |
783 | ||
784 | int erst_write(const struct cper_record_header *record) | |
785 | { | |
786 | int rc; | |
787 | unsigned long flags; | |
788 | struct cper_record_header *rcd_erange; | |
789 | ||
790 | if (erst_disable) | |
791 | return -ENODEV; | |
792 | ||
793 | if (memcmp(record->signature, CPER_SIG_RECORD, CPER_SIG_SIZE)) | |
794 | return -EINVAL; | |
795 | ||
796 | if (erst_erange.attr & ERST_RANGE_NVRAM) { | |
3b38bb5f | 797 | if (!raw_spin_trylock_irqsave(&erst_lock, flags)) |
a08f82d0 HY |
798 | return -EBUSY; |
799 | rc = __erst_write_to_nvram(record); | |
3b38bb5f | 800 | raw_spin_unlock_irqrestore(&erst_lock, flags); |
a08f82d0 HY |
801 | return rc; |
802 | } | |
803 | ||
804 | if (record->record_length > erst_erange.size) | |
805 | return -EINVAL; | |
806 | ||
3b38bb5f | 807 | if (!raw_spin_trylock_irqsave(&erst_lock, flags)) |
a08f82d0 HY |
808 | return -EBUSY; |
809 | memcpy(erst_erange.vaddr, record, record->record_length); | |
810 | rcd_erange = erst_erange.vaddr; | |
811 | /* signature for serialization system */ | |
812 | memcpy(&rcd_erange->persistence_information, "ER", 2); | |
813 | ||
814 | rc = __erst_write_to_storage(0); | |
3b38bb5f | 815 | raw_spin_unlock_irqrestore(&erst_lock, flags); |
a08f82d0 HY |
816 | |
817 | return rc; | |
818 | } | |
819 | EXPORT_SYMBOL_GPL(erst_write); | |
820 | ||
821 | static int __erst_read_to_erange(u64 record_id, u64 *offset) | |
822 | { | |
823 | int rc; | |
824 | ||
825 | if (erst_erange.attr & ERST_RANGE_NVRAM) | |
826 | return __erst_read_to_erange_from_nvram( | |
827 | record_id, offset); | |
828 | ||
829 | rc = __erst_read_from_storage(record_id, 0); | |
830 | if (rc) | |
831 | return rc; | |
832 | *offset = 0; | |
833 | ||
834 | return 0; | |
835 | } | |
836 | ||
837 | static ssize_t __erst_read(u64 record_id, struct cper_record_header *record, | |
838 | size_t buflen) | |
839 | { | |
840 | int rc; | |
841 | u64 offset, len = 0; | |
842 | struct cper_record_header *rcd_tmp; | |
843 | ||
844 | rc = __erst_read_to_erange(record_id, &offset); | |
845 | if (rc) | |
846 | return rc; | |
847 | rcd_tmp = erst_erange.vaddr + offset; | |
848 | len = rcd_tmp->record_length; | |
849 | if (len <= buflen) | |
850 | memcpy(record, rcd_tmp, len); | |
851 | ||
852 | return len; | |
853 | } | |
854 | ||
855 | /* | |
856 | * If return value > buflen, the buffer size is not big enough, | |
857 | * else if return value < 0, something goes wrong, | |
858 | * else everything is OK, and return value is record length | |
859 | */ | |
860 | ssize_t erst_read(u64 record_id, struct cper_record_header *record, | |
861 | size_t buflen) | |
862 | { | |
863 | ssize_t len; | |
864 | unsigned long flags; | |
865 | ||
866 | if (erst_disable) | |
867 | return -ENODEV; | |
868 | ||
3b38bb5f | 869 | raw_spin_lock_irqsave(&erst_lock, flags); |
a08f82d0 | 870 | len = __erst_read(record_id, record, buflen); |
3b38bb5f | 871 | raw_spin_unlock_irqrestore(&erst_lock, flags); |
a08f82d0 HY |
872 | return len; |
873 | } | |
874 | EXPORT_SYMBOL_GPL(erst_read); | |
875 | ||
a08f82d0 HY |
876 | int erst_clear(u64 record_id) |
877 | { | |
885b976f | 878 | int rc, i; |
a08f82d0 | 879 | unsigned long flags; |
885b976f | 880 | u64 *entries; |
a08f82d0 HY |
881 | |
882 | if (erst_disable) | |
883 | return -ENODEV; | |
884 | ||
885b976f HY |
885 | rc = mutex_lock_interruptible(&erst_record_id_cache.lock); |
886 | if (rc) | |
887 | return rc; | |
3b38bb5f | 888 | raw_spin_lock_irqsave(&erst_lock, flags); |
a08f82d0 HY |
889 | if (erst_erange.attr & ERST_RANGE_NVRAM) |
890 | rc = __erst_clear_from_nvram(record_id); | |
891 | else | |
892 | rc = __erst_clear_from_storage(record_id); | |
3b38bb5f | 893 | raw_spin_unlock_irqrestore(&erst_lock, flags); |
885b976f HY |
894 | if (rc) |
895 | goto out; | |
896 | entries = erst_record_id_cache.entries; | |
897 | for (i = 0; i < erst_record_id_cache.len; i++) { | |
898 | if (entries[i] == record_id) | |
899 | entries[i] = APEI_ERST_INVALID_RECORD_ID; | |
900 | } | |
901 | __erst_record_id_cache_compact(); | |
902 | out: | |
903 | mutex_unlock(&erst_record_id_cache.lock); | |
a08f82d0 HY |
904 | return rc; |
905 | } | |
906 | EXPORT_SYMBOL_GPL(erst_clear); | |
907 | ||
908 | static int __init setup_erst_disable(char *str) | |
909 | { | |
910 | erst_disable = 1; | |
911 | return 0; | |
912 | } | |
913 | ||
914 | __setup("erst_disable", setup_erst_disable); | |
915 | ||
916 | static int erst_check_table(struct acpi_table_erst *erst_tab) | |
917 | { | |
3a78f965 HY |
918 | if ((erst_tab->header_length != |
919 | (sizeof(struct acpi_table_erst) - sizeof(erst_tab->header))) | |
920 | && (erst_tab->header_length != sizeof(struct acpi_table_einj))) | |
a08f82d0 HY |
921 | return -EINVAL; |
922 | if (erst_tab->header.length < sizeof(struct acpi_table_erst)) | |
923 | return -EINVAL; | |
924 | if (erst_tab->entries != | |
925 | (erst_tab->header.length - sizeof(struct acpi_table_erst)) / | |
926 | sizeof(struct acpi_erst_entry)) | |
927 | return -EINVAL; | |
928 | ||
929 | return 0; | |
930 | } | |
931 | ||
06cf91b4 CG |
932 | static int erst_open_pstore(struct pstore_info *psi); |
933 | static int erst_close_pstore(struct pstore_info *psi); | |
8d38d74b | 934 | static ssize_t erst_reader(u64 *id, enum pstore_type_id *type, |
0bb77c46 TL |
935 | struct timespec *time); |
936 | static u64 erst_writer(enum pstore_type_id type, size_t size); | |
937 | ||
938 | static struct pstore_info erst_info = { | |
939 | .owner = THIS_MODULE, | |
940 | .name = "erst", | |
06cf91b4 CG |
941 | .open = erst_open_pstore, |
942 | .close = erst_close_pstore, | |
0bb77c46 TL |
943 | .read = erst_reader, |
944 | .write = erst_writer, | |
945 | .erase = erst_clear | |
946 | }; | |
947 | ||
948 | #define CPER_CREATOR_PSTORE \ | |
949 | UUID_LE(0x75a574e3, 0x5052, 0x4b29, 0x8a, 0x8e, 0xbe, 0x2c, \ | |
950 | 0x64, 0x90, 0xb8, 0x9d) | |
951 | #define CPER_SECTION_TYPE_DMESG \ | |
952 | UUID_LE(0xc197e04e, 0xd545, 0x4a70, 0x9c, 0x17, 0xa5, 0x54, \ | |
953 | 0x94, 0x19, 0xeb, 0x12) | |
954 | #define CPER_SECTION_TYPE_MCE \ | |
955 | UUID_LE(0xfe08ffbe, 0x95e4, 0x4be7, 0xbc, 0x73, 0x40, 0x96, \ | |
956 | 0x04, 0x4a, 0x38, 0xfc) | |
957 | ||
958 | struct cper_pstore_record { | |
959 | struct cper_record_header hdr; | |
960 | struct cper_section_descriptor sec_hdr; | |
961 | char data[]; | |
962 | } __packed; | |
963 | ||
06cf91b4 CG |
964 | static int reader_pos; |
965 | ||
966 | static int erst_open_pstore(struct pstore_info *psi) | |
967 | { | |
968 | int rc; | |
969 | ||
970 | if (erst_disable) | |
971 | return -ENODEV; | |
972 | ||
973 | rc = erst_get_record_id_begin(&reader_pos); | |
974 | ||
975 | return rc; | |
976 | } | |
977 | ||
978 | static int erst_close_pstore(struct pstore_info *psi) | |
979 | { | |
980 | erst_get_record_id_end(); | |
981 | ||
982 | return 0; | |
983 | } | |
984 | ||
8d38d74b | 985 | static ssize_t erst_reader(u64 *id, enum pstore_type_id *type, |
0bb77c46 TL |
986 | struct timespec *time) |
987 | { | |
988 | int rc; | |
06cf91b4 | 989 | ssize_t len = 0; |
0bb77c46 TL |
990 | u64 record_id; |
991 | struct cper_pstore_record *rcd = (struct cper_pstore_record *) | |
992 | (erst_info.buf - sizeof(*rcd)); | |
993 | ||
994 | if (erst_disable) | |
995 | return -ENODEV; | |
996 | ||
0bb77c46 | 997 | skip: |
06cf91b4 CG |
998 | rc = erst_get_record_id_next(&reader_pos, &record_id); |
999 | if (rc) | |
1000 | goto out; | |
1001 | ||
0bb77c46 TL |
1002 | /* no more record */ |
1003 | if (record_id == APEI_ERST_INVALID_RECORD_ID) { | |
06cf91b4 CG |
1004 | rc = -1; |
1005 | goto out; | |
0bb77c46 TL |
1006 | } |
1007 | ||
06cf91b4 | 1008 | len = erst_read(record_id, &rcd->hdr, sizeof(*rcd) + |
f5ec25de CG |
1009 | erst_info.bufsize); |
1010 | /* The record may be cleared by others, try read next record */ | |
1011 | if (len == -ENOENT) | |
1012 | goto skip; | |
1013 | else if (len < 0) { | |
1014 | rc = -1; | |
1015 | goto out; | |
1016 | } | |
0bb77c46 TL |
1017 | if (uuid_le_cmp(rcd->hdr.creator_id, CPER_CREATOR_PSTORE) != 0) |
1018 | goto skip; | |
0bb77c46 TL |
1019 | |
1020 | *id = record_id; | |
1021 | if (uuid_le_cmp(rcd->sec_hdr.section_type, | |
1022 | CPER_SECTION_TYPE_DMESG) == 0) | |
1023 | *type = PSTORE_TYPE_DMESG; | |
1024 | else if (uuid_le_cmp(rcd->sec_hdr.section_type, | |
1025 | CPER_SECTION_TYPE_MCE) == 0) | |
1026 | *type = PSTORE_TYPE_MCE; | |
1027 | else | |
1028 | *type = PSTORE_TYPE_UNKNOWN; | |
1029 | ||
1030 | if (rcd->hdr.validation_bits & CPER_VALID_TIMESTAMP) | |
1031 | time->tv_sec = rcd->hdr.timestamp; | |
1032 | else | |
1033 | time->tv_sec = 0; | |
1034 | time->tv_nsec = 0; | |
1035 | ||
06cf91b4 CG |
1036 | out: |
1037 | return (rc < 0) ? rc : (len - sizeof(*rcd)); | |
0bb77c46 TL |
1038 | } |
1039 | ||
1040 | static u64 erst_writer(enum pstore_type_id type, size_t size) | |
1041 | { | |
1042 | struct cper_pstore_record *rcd = (struct cper_pstore_record *) | |
1043 | (erst_info.buf - sizeof(*rcd)); | |
1044 | ||
1045 | memset(rcd, 0, sizeof(*rcd)); | |
1046 | memcpy(rcd->hdr.signature, CPER_SIG_RECORD, CPER_SIG_SIZE); | |
1047 | rcd->hdr.revision = CPER_RECORD_REV; | |
1048 | rcd->hdr.signature_end = CPER_SIG_END; | |
1049 | rcd->hdr.section_count = 1; | |
1050 | rcd->hdr.error_severity = CPER_SEV_FATAL; | |
1051 | /* timestamp valid. platform_id, partition_id are invalid */ | |
1052 | rcd->hdr.validation_bits = CPER_VALID_TIMESTAMP; | |
1053 | rcd->hdr.timestamp = get_seconds(); | |
1054 | rcd->hdr.record_length = sizeof(*rcd) + size; | |
1055 | rcd->hdr.creator_id = CPER_CREATOR_PSTORE; | |
1056 | rcd->hdr.notification_type = CPER_NOTIFY_MCE; | |
1057 | rcd->hdr.record_id = cper_next_record_id(); | |
1058 | rcd->hdr.flags = CPER_HW_ERROR_FLAGS_PREVERR; | |
1059 | ||
1060 | rcd->sec_hdr.section_offset = sizeof(*rcd); | |
1061 | rcd->sec_hdr.section_length = size; | |
1062 | rcd->sec_hdr.revision = CPER_SEC_REV; | |
1063 | /* fru_id and fru_text is invalid */ | |
1064 | rcd->sec_hdr.validation_bits = 0; | |
1065 | rcd->sec_hdr.flags = CPER_SEC_PRIMARY; | |
1066 | switch (type) { | |
1067 | case PSTORE_TYPE_DMESG: | |
1068 | rcd->sec_hdr.section_type = CPER_SECTION_TYPE_DMESG; | |
1069 | break; | |
1070 | case PSTORE_TYPE_MCE: | |
1071 | rcd->sec_hdr.section_type = CPER_SECTION_TYPE_MCE; | |
1072 | break; | |
1073 | default: | |
1074 | return -EINVAL; | |
1075 | } | |
1076 | rcd->sec_hdr.section_severity = CPER_SEV_FATAL; | |
1077 | ||
1078 | erst_write(&rcd->hdr); | |
1079 | ||
1080 | return rcd->hdr.record_id; | |
1081 | } | |
1082 | ||
a08f82d0 HY |
1083 | static int __init erst_init(void) |
1084 | { | |
1085 | int rc = 0; | |
1086 | acpi_status status; | |
1087 | struct apei_exec_context ctx; | |
1088 | struct apei_resources erst_resources; | |
1089 | struct resource *r; | |
0bb77c46 | 1090 | char *buf; |
a08f82d0 HY |
1091 | |
1092 | if (acpi_disabled) | |
1093 | goto err; | |
1094 | ||
1095 | if (erst_disable) { | |
1096 | pr_info(ERST_PFX | |
1097 | "Error Record Serialization Table (ERST) support is disabled.\n"); | |
1098 | goto err; | |
1099 | } | |
1100 | ||
1101 | status = acpi_get_table(ACPI_SIG_ERST, 0, | |
1102 | (struct acpi_table_header **)&erst_tab); | |
1103 | if (status == AE_NOT_FOUND) { | |
980533b0 | 1104 | pr_info(ERST_PFX "Table is not found!\n"); |
a08f82d0 HY |
1105 | goto err; |
1106 | } else if (ACPI_FAILURE(status)) { | |
1107 | const char *msg = acpi_format_exception(status); | |
1108 | pr_err(ERST_PFX "Failed to get table, %s\n", msg); | |
1109 | rc = -EINVAL; | |
1110 | goto err; | |
1111 | } | |
1112 | ||
1113 | rc = erst_check_table(erst_tab); | |
1114 | if (rc) { | |
1115 | pr_err(FW_BUG ERST_PFX "ERST table is invalid\n"); | |
1116 | goto err; | |
1117 | } | |
1118 | ||
1119 | apei_resources_init(&erst_resources); | |
1120 | erst_exec_ctx_init(&ctx); | |
1121 | rc = apei_exec_collect_resources(&ctx, &erst_resources); | |
1122 | if (rc) | |
1123 | goto err_fini; | |
1124 | rc = apei_resources_request(&erst_resources, "APEI ERST"); | |
1125 | if (rc) | |
1126 | goto err_fini; | |
1127 | rc = apei_exec_pre_map_gars(&ctx); | |
1128 | if (rc) | |
1129 | goto err_release; | |
1130 | rc = erst_get_erange(&erst_erange); | |
1131 | if (rc) { | |
1132 | if (rc == -ENODEV) | |
1133 | pr_info(ERST_PFX | |
1134 | "The corresponding hardware device or firmware implementation " | |
1135 | "is not available.\n"); | |
1136 | else | |
1137 | pr_err(ERST_PFX | |
1138 | "Failed to get Error Log Address Range.\n"); | |
1139 | goto err_unmap_reg; | |
1140 | } | |
1141 | ||
1142 | r = request_mem_region(erst_erange.base, erst_erange.size, "APEI ERST"); | |
1143 | if (!r) { | |
1144 | pr_err(ERST_PFX | |
1145 | "Can not request iomem region <0x%16llx-0x%16llx> for ERST.\n", | |
1146 | (unsigned long long)erst_erange.base, | |
1147 | (unsigned long long)erst_erange.base + erst_erange.size); | |
1148 | rc = -EIO; | |
1149 | goto err_unmap_reg; | |
1150 | } | |
1151 | rc = -ENOMEM; | |
1152 | erst_erange.vaddr = ioremap_cache(erst_erange.base, | |
1153 | erst_erange.size); | |
1154 | if (!erst_erange.vaddr) | |
1155 | goto err_release_erange; | |
1156 | ||
0bb77c46 TL |
1157 | buf = kmalloc(erst_erange.size, GFP_KERNEL); |
1158 | mutex_init(&erst_info.buf_mutex); | |
1159 | if (buf) { | |
1160 | erst_info.buf = buf + sizeof(struct cper_pstore_record); | |
1161 | erst_info.bufsize = erst_erange.size - | |
1162 | sizeof(struct cper_pstore_record); | |
1163 | if (pstore_register(&erst_info)) { | |
1164 | pr_info(ERST_PFX "Could not register with persistent store\n"); | |
1165 | kfree(buf); | |
1166 | } | |
1167 | } | |
1168 | ||
a08f82d0 HY |
1169 | pr_info(ERST_PFX |
1170 | "Error Record Serialization Table (ERST) support is initialized.\n"); | |
1171 | ||
1172 | return 0; | |
1173 | ||
1174 | err_release_erange: | |
1175 | release_mem_region(erst_erange.base, erst_erange.size); | |
1176 | err_unmap_reg: | |
1177 | apei_exec_post_unmap_gars(&ctx); | |
1178 | err_release: | |
1179 | apei_resources_release(&erst_resources); | |
1180 | err_fini: | |
1181 | apei_resources_fini(&erst_resources); | |
1182 | err: | |
1183 | erst_disable = 1; | |
1184 | return rc; | |
1185 | } | |
1186 | ||
1187 | device_initcall(erst_init); |