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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 | |
5 | * infomation to and from a persistent store. | |
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> |
a08f82d0 HY |
37 | #include <acpi/apei.h> |
38 | ||
39 | #include "apei-internal.h" | |
40 | ||
41 | #define ERST_PFX "ERST: " | |
42 | ||
43 | /* ERST command status */ | |
44 | #define ERST_STATUS_SUCCESS 0x0 | |
45 | #define ERST_STATUS_NOT_ENOUGH_SPACE 0x1 | |
46 | #define ERST_STATUS_HARDWARE_NOT_AVAILABLE 0x2 | |
47 | #define ERST_STATUS_FAILED 0x3 | |
48 | #define ERST_STATUS_RECORD_STORE_EMPTY 0x4 | |
49 | #define ERST_STATUS_RECORD_NOT_FOUND 0x5 | |
50 | ||
51 | #define ERST_TAB_ENTRY(tab) \ | |
52 | ((struct acpi_whea_header *)((char *)(tab) + \ | |
53 | sizeof(struct acpi_table_erst))) | |
54 | ||
55 | #define SPIN_UNIT 100 /* 100ns */ | |
56 | /* Firmware should respond within 1 miliseconds */ | |
57 | #define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC) | |
58 | #define FIRMWARE_MAX_STALL 50 /* 50us */ | |
59 | ||
60 | int erst_disable; | |
61 | EXPORT_SYMBOL_GPL(erst_disable); | |
62 | ||
63 | static struct acpi_table_erst *erst_tab; | |
64 | ||
65 | /* ERST Error Log Address Range atrributes */ | |
66 | #define ERST_RANGE_RESERVED 0x0001 | |
67 | #define ERST_RANGE_NVRAM 0x0002 | |
68 | #define ERST_RANGE_SLOW 0x0004 | |
69 | ||
70 | /* | |
71 | * ERST Error Log Address Range, used as buffer for reading/writing | |
72 | * error records. | |
73 | */ | |
74 | static struct erst_erange { | |
75 | u64 base; | |
76 | u64 size; | |
77 | void __iomem *vaddr; | |
78 | u32 attr; | |
79 | } erst_erange; | |
80 | ||
81 | /* | |
82 | * Prevent ERST interpreter to run simultaneously, because the | |
83 | * corresponding firmware implementation may not work properly when | |
84 | * invoked simultaneously. | |
85 | * | |
86 | * It is used to provide exclusive accessing for ERST Error Log | |
87 | * Address Range too. | |
88 | */ | |
89 | static DEFINE_SPINLOCK(erst_lock); | |
90 | ||
91 | static inline int erst_errno(int command_status) | |
92 | { | |
93 | switch (command_status) { | |
94 | case ERST_STATUS_SUCCESS: | |
95 | return 0; | |
96 | case ERST_STATUS_HARDWARE_NOT_AVAILABLE: | |
97 | return -ENODEV; | |
98 | case ERST_STATUS_NOT_ENOUGH_SPACE: | |
99 | return -ENOSPC; | |
100 | case ERST_STATUS_RECORD_STORE_EMPTY: | |
101 | case ERST_STATUS_RECORD_NOT_FOUND: | |
102 | return -ENOENT; | |
103 | default: | |
104 | return -EINVAL; | |
105 | } | |
106 | } | |
107 | ||
108 | static int erst_timedout(u64 *t, u64 spin_unit) | |
109 | { | |
110 | if ((s64)*t < spin_unit) { | |
111 | pr_warning(FW_WARN ERST_PFX | |
112 | "Firmware does not respond in time\n"); | |
113 | return 1; | |
114 | } | |
115 | *t -= spin_unit; | |
116 | ndelay(spin_unit); | |
117 | touch_nmi_watchdog(); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static int erst_exec_load_var1(struct apei_exec_context *ctx, | |
122 | struct acpi_whea_header *entry) | |
123 | { | |
124 | return __apei_exec_read_register(entry, &ctx->var1); | |
125 | } | |
126 | ||
127 | static int erst_exec_load_var2(struct apei_exec_context *ctx, | |
128 | struct acpi_whea_header *entry) | |
129 | { | |
130 | return __apei_exec_read_register(entry, &ctx->var2); | |
131 | } | |
132 | ||
133 | static int erst_exec_store_var1(struct apei_exec_context *ctx, | |
134 | struct acpi_whea_header *entry) | |
135 | { | |
136 | return __apei_exec_write_register(entry, ctx->var1); | |
137 | } | |
138 | ||
139 | static int erst_exec_add(struct apei_exec_context *ctx, | |
140 | struct acpi_whea_header *entry) | |
141 | { | |
142 | ctx->var1 += ctx->var2; | |
143 | return 0; | |
144 | } | |
145 | ||
146 | static int erst_exec_subtract(struct apei_exec_context *ctx, | |
147 | struct acpi_whea_header *entry) | |
148 | { | |
149 | ctx->var1 -= ctx->var2; | |
150 | return 0; | |
151 | } | |
152 | ||
153 | static int erst_exec_add_value(struct apei_exec_context *ctx, | |
154 | struct acpi_whea_header *entry) | |
155 | { | |
156 | int rc; | |
157 | u64 val; | |
158 | ||
159 | rc = __apei_exec_read_register(entry, &val); | |
160 | if (rc) | |
161 | return rc; | |
162 | val += ctx->value; | |
163 | rc = __apei_exec_write_register(entry, val); | |
164 | return rc; | |
165 | } | |
166 | ||
167 | static int erst_exec_subtract_value(struct apei_exec_context *ctx, | |
168 | struct acpi_whea_header *entry) | |
169 | { | |
170 | int rc; | |
171 | u64 val; | |
172 | ||
173 | rc = __apei_exec_read_register(entry, &val); | |
174 | if (rc) | |
175 | return rc; | |
176 | val -= ctx->value; | |
177 | rc = __apei_exec_write_register(entry, val); | |
178 | return rc; | |
179 | } | |
180 | ||
181 | static int erst_exec_stall(struct apei_exec_context *ctx, | |
182 | struct acpi_whea_header *entry) | |
183 | { | |
184 | u64 stall_time; | |
185 | ||
186 | if (ctx->value > FIRMWARE_MAX_STALL) { | |
187 | if (!in_nmi()) | |
188 | pr_warning(FW_WARN ERST_PFX | |
189 | "Too long stall time for stall instruction: %llx.\n", | |
190 | ctx->value); | |
191 | stall_time = FIRMWARE_MAX_STALL; | |
192 | } else | |
193 | stall_time = ctx->value; | |
194 | udelay(stall_time); | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static int erst_exec_stall_while_true(struct apei_exec_context *ctx, | |
199 | struct acpi_whea_header *entry) | |
200 | { | |
201 | int rc; | |
202 | u64 val; | |
203 | u64 timeout = FIRMWARE_TIMEOUT; | |
204 | u64 stall_time; | |
205 | ||
206 | if (ctx->var1 > FIRMWARE_MAX_STALL) { | |
207 | if (!in_nmi()) | |
208 | pr_warning(FW_WARN ERST_PFX | |
209 | "Too long stall time for stall while true instruction: %llx.\n", | |
210 | ctx->var1); | |
211 | stall_time = FIRMWARE_MAX_STALL; | |
212 | } else | |
213 | stall_time = ctx->var1; | |
214 | ||
215 | for (;;) { | |
216 | rc = __apei_exec_read_register(entry, &val); | |
217 | if (rc) | |
218 | return rc; | |
219 | if (val != ctx->value) | |
220 | break; | |
221 | if (erst_timedout(&timeout, stall_time * NSEC_PER_USEC)) | |
222 | return -EIO; | |
223 | } | |
224 | return 0; | |
225 | } | |
226 | ||
227 | static int erst_exec_skip_next_instruction_if_true( | |
228 | struct apei_exec_context *ctx, | |
229 | struct acpi_whea_header *entry) | |
230 | { | |
231 | int rc; | |
232 | u64 val; | |
233 | ||
234 | rc = __apei_exec_read_register(entry, &val); | |
235 | if (rc) | |
236 | return rc; | |
237 | if (val == ctx->value) { | |
238 | ctx->ip += 2; | |
239 | return APEI_EXEC_SET_IP; | |
240 | } | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static int erst_exec_goto(struct apei_exec_context *ctx, | |
246 | struct acpi_whea_header *entry) | |
247 | { | |
248 | ctx->ip = ctx->value; | |
249 | return APEI_EXEC_SET_IP; | |
250 | } | |
251 | ||
252 | static int erst_exec_set_src_address_base(struct apei_exec_context *ctx, | |
253 | struct acpi_whea_header *entry) | |
254 | { | |
255 | return __apei_exec_read_register(entry, &ctx->src_base); | |
256 | } | |
257 | ||
258 | static int erst_exec_set_dst_address_base(struct apei_exec_context *ctx, | |
259 | struct acpi_whea_header *entry) | |
260 | { | |
261 | return __apei_exec_read_register(entry, &ctx->dst_base); | |
262 | } | |
263 | ||
264 | static int erst_exec_move_data(struct apei_exec_context *ctx, | |
265 | struct acpi_whea_header *entry) | |
266 | { | |
267 | int rc; | |
268 | u64 offset; | |
269 | ||
270 | rc = __apei_exec_read_register(entry, &offset); | |
271 | if (rc) | |
272 | return rc; | |
273 | memmove((void *)ctx->dst_base + offset, | |
274 | (void *)ctx->src_base + offset, | |
275 | ctx->var2); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static struct apei_exec_ins_type erst_ins_type[] = { | |
281 | [ACPI_ERST_READ_REGISTER] = { | |
282 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
283 | .run = apei_exec_read_register, | |
284 | }, | |
285 | [ACPI_ERST_READ_REGISTER_VALUE] = { | |
286 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
287 | .run = apei_exec_read_register_value, | |
288 | }, | |
289 | [ACPI_ERST_WRITE_REGISTER] = { | |
290 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
291 | .run = apei_exec_write_register, | |
292 | }, | |
293 | [ACPI_ERST_WRITE_REGISTER_VALUE] = { | |
294 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
295 | .run = apei_exec_write_register_value, | |
296 | }, | |
297 | [ACPI_ERST_NOOP] = { | |
298 | .flags = 0, | |
299 | .run = apei_exec_noop, | |
300 | }, | |
301 | [ACPI_ERST_LOAD_VAR1] = { | |
302 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
303 | .run = erst_exec_load_var1, | |
304 | }, | |
305 | [ACPI_ERST_LOAD_VAR2] = { | |
306 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
307 | .run = erst_exec_load_var2, | |
308 | }, | |
309 | [ACPI_ERST_STORE_VAR1] = { | |
310 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
311 | .run = erst_exec_store_var1, | |
312 | }, | |
313 | [ACPI_ERST_ADD] = { | |
314 | .flags = 0, | |
315 | .run = erst_exec_add, | |
316 | }, | |
317 | [ACPI_ERST_SUBTRACT] = { | |
318 | .flags = 0, | |
319 | .run = erst_exec_subtract, | |
320 | }, | |
321 | [ACPI_ERST_ADD_VALUE] = { | |
322 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
323 | .run = erst_exec_add_value, | |
324 | }, | |
325 | [ACPI_ERST_SUBTRACT_VALUE] = { | |
326 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
327 | .run = erst_exec_subtract_value, | |
328 | }, | |
329 | [ACPI_ERST_STALL] = { | |
330 | .flags = 0, | |
331 | .run = erst_exec_stall, | |
332 | }, | |
333 | [ACPI_ERST_STALL_WHILE_TRUE] = { | |
334 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
335 | .run = erst_exec_stall_while_true, | |
336 | }, | |
337 | [ACPI_ERST_SKIP_NEXT_IF_TRUE] = { | |
338 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
339 | .run = erst_exec_skip_next_instruction_if_true, | |
340 | }, | |
341 | [ACPI_ERST_GOTO] = { | |
342 | .flags = 0, | |
343 | .run = erst_exec_goto, | |
344 | }, | |
345 | [ACPI_ERST_SET_SRC_ADDRESS_BASE] = { | |
346 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
347 | .run = erst_exec_set_src_address_base, | |
348 | }, | |
349 | [ACPI_ERST_SET_DST_ADDRESS_BASE] = { | |
350 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
351 | .run = erst_exec_set_dst_address_base, | |
352 | }, | |
353 | [ACPI_ERST_MOVE_DATA] = { | |
354 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, | |
355 | .run = erst_exec_move_data, | |
356 | }, | |
357 | }; | |
358 | ||
359 | static inline void erst_exec_ctx_init(struct apei_exec_context *ctx) | |
360 | { | |
361 | apei_exec_ctx_init(ctx, erst_ins_type, ARRAY_SIZE(erst_ins_type), | |
362 | ERST_TAB_ENTRY(erst_tab), erst_tab->entries); | |
363 | } | |
364 | ||
365 | static int erst_get_erange(struct erst_erange *range) | |
366 | { | |
367 | struct apei_exec_context ctx; | |
368 | int rc; | |
369 | ||
370 | erst_exec_ctx_init(&ctx); | |
371 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_RANGE); | |
372 | if (rc) | |
373 | return rc; | |
374 | range->base = apei_exec_ctx_get_output(&ctx); | |
375 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_LENGTH); | |
376 | if (rc) | |
377 | return rc; | |
378 | range->size = apei_exec_ctx_get_output(&ctx); | |
379 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_ATTRIBUTES); | |
380 | if (rc) | |
381 | return rc; | |
382 | range->attr = apei_exec_ctx_get_output(&ctx); | |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
387 | static ssize_t __erst_get_record_count(void) | |
388 | { | |
389 | struct apei_exec_context ctx; | |
390 | int rc; | |
391 | ||
392 | erst_exec_ctx_init(&ctx); | |
393 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_RECORD_COUNT); | |
394 | if (rc) | |
395 | return rc; | |
396 | return apei_exec_ctx_get_output(&ctx); | |
397 | } | |
398 | ||
399 | ssize_t erst_get_record_count(void) | |
400 | { | |
401 | ssize_t count; | |
402 | unsigned long flags; | |
403 | ||
404 | if (erst_disable) | |
405 | return -ENODEV; | |
406 | ||
407 | spin_lock_irqsave(&erst_lock, flags); | |
408 | count = __erst_get_record_count(); | |
409 | spin_unlock_irqrestore(&erst_lock, flags); | |
410 | ||
411 | return count; | |
412 | } | |
413 | EXPORT_SYMBOL_GPL(erst_get_record_count); | |
414 | ||
415 | static int __erst_get_next_record_id(u64 *record_id) | |
416 | { | |
417 | struct apei_exec_context ctx; | |
418 | int rc; | |
419 | ||
420 | erst_exec_ctx_init(&ctx); | |
421 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_RECORD_ID); | |
422 | if (rc) | |
423 | return rc; | |
424 | *record_id = apei_exec_ctx_get_output(&ctx); | |
425 | ||
426 | return 0; | |
427 | } | |
428 | ||
429 | /* | |
430 | * Get the record ID of an existing error record on the persistent | |
431 | * storage. If there is no error record on the persistent storage, the | |
432 | * returned record_id is APEI_ERST_INVALID_RECORD_ID. | |
433 | */ | |
434 | int erst_get_next_record_id(u64 *record_id) | |
435 | { | |
436 | int rc; | |
437 | unsigned long flags; | |
438 | ||
439 | if (erst_disable) | |
440 | return -ENODEV; | |
441 | ||
442 | spin_lock_irqsave(&erst_lock, flags); | |
443 | rc = __erst_get_next_record_id(record_id); | |
444 | spin_unlock_irqrestore(&erst_lock, flags); | |
445 | ||
446 | return rc; | |
447 | } | |
448 | EXPORT_SYMBOL_GPL(erst_get_next_record_id); | |
449 | ||
450 | static int __erst_write_to_storage(u64 offset) | |
451 | { | |
452 | struct apei_exec_context ctx; | |
453 | u64 timeout = FIRMWARE_TIMEOUT; | |
454 | u64 val; | |
455 | int rc; | |
456 | ||
457 | erst_exec_ctx_init(&ctx); | |
458 | rc = apei_exec_run(&ctx, ACPI_ERST_BEGIN_WRITE); | |
459 | if (rc) | |
460 | return rc; | |
461 | apei_exec_ctx_set_input(&ctx, offset); | |
462 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_OFFSET); | |
463 | if (rc) | |
464 | return rc; | |
465 | rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION); | |
466 | if (rc) | |
467 | return rc; | |
468 | for (;;) { | |
469 | rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS); | |
470 | if (rc) | |
471 | return rc; | |
472 | val = apei_exec_ctx_get_output(&ctx); | |
473 | if (!val) | |
474 | break; | |
475 | if (erst_timedout(&timeout, SPIN_UNIT)) | |
476 | return -EIO; | |
477 | } | |
478 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS); | |
479 | if (rc) | |
480 | return rc; | |
481 | val = apei_exec_ctx_get_output(&ctx); | |
482 | rc = apei_exec_run(&ctx, ACPI_ERST_END); | |
483 | if (rc) | |
484 | return rc; | |
485 | ||
486 | return erst_errno(val); | |
487 | } | |
488 | ||
489 | static int __erst_read_from_storage(u64 record_id, u64 offset) | |
490 | { | |
491 | struct apei_exec_context ctx; | |
492 | u64 timeout = FIRMWARE_TIMEOUT; | |
493 | u64 val; | |
494 | int rc; | |
495 | ||
496 | erst_exec_ctx_init(&ctx); | |
497 | rc = apei_exec_run(&ctx, ACPI_ERST_BEGIN_READ); | |
498 | if (rc) | |
499 | return rc; | |
500 | apei_exec_ctx_set_input(&ctx, offset); | |
501 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_OFFSET); | |
502 | if (rc) | |
503 | return rc; | |
504 | apei_exec_ctx_set_input(&ctx, record_id); | |
505 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_ID); | |
506 | if (rc) | |
507 | return rc; | |
508 | rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION); | |
509 | if (rc) | |
510 | return rc; | |
511 | for (;;) { | |
512 | rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS); | |
513 | if (rc) | |
514 | return rc; | |
515 | val = apei_exec_ctx_get_output(&ctx); | |
516 | if (!val) | |
517 | break; | |
518 | if (erst_timedout(&timeout, SPIN_UNIT)) | |
519 | return -EIO; | |
520 | }; | |
521 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS); | |
522 | if (rc) | |
523 | return rc; | |
524 | val = apei_exec_ctx_get_output(&ctx); | |
525 | rc = apei_exec_run(&ctx, ACPI_ERST_END); | |
526 | if (rc) | |
527 | return rc; | |
528 | ||
529 | return erst_errno(val); | |
530 | } | |
531 | ||
532 | static int __erst_clear_from_storage(u64 record_id) | |
533 | { | |
534 | struct apei_exec_context ctx; | |
535 | u64 timeout = FIRMWARE_TIMEOUT; | |
536 | u64 val; | |
537 | int rc; | |
538 | ||
539 | erst_exec_ctx_init(&ctx); | |
540 | rc = apei_exec_run(&ctx, ACPI_ERST_BEGIN_CLEAR); | |
541 | if (rc) | |
542 | return rc; | |
543 | apei_exec_ctx_set_input(&ctx, record_id); | |
544 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_ID); | |
545 | if (rc) | |
546 | return rc; | |
547 | rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION); | |
548 | if (rc) | |
549 | return rc; | |
550 | for (;;) { | |
551 | rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS); | |
552 | if (rc) | |
553 | return rc; | |
554 | val = apei_exec_ctx_get_output(&ctx); | |
555 | if (!val) | |
556 | break; | |
557 | if (erst_timedout(&timeout, SPIN_UNIT)) | |
558 | return -EIO; | |
559 | } | |
560 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS); | |
561 | if (rc) | |
562 | return rc; | |
563 | val = apei_exec_ctx_get_output(&ctx); | |
564 | rc = apei_exec_run(&ctx, ACPI_ERST_END); | |
565 | if (rc) | |
566 | return rc; | |
567 | ||
568 | return erst_errno(val); | |
569 | } | |
570 | ||
571 | /* NVRAM ERST Error Log Address Range is not supported yet */ | |
572 | static void pr_unimpl_nvram(void) | |
573 | { | |
574 | if (printk_ratelimit()) | |
575 | pr_warning(ERST_PFX | |
576 | "NVRAM ERST Log Address Range is not implemented yet\n"); | |
577 | } | |
578 | ||
579 | static int __erst_write_to_nvram(const struct cper_record_header *record) | |
580 | { | |
581 | /* do not print message, because printk is not safe for NMI */ | |
582 | return -ENOSYS; | |
583 | } | |
584 | ||
585 | static int __erst_read_to_erange_from_nvram(u64 record_id, u64 *offset) | |
586 | { | |
587 | pr_unimpl_nvram(); | |
588 | return -ENOSYS; | |
589 | } | |
590 | ||
591 | static int __erst_clear_from_nvram(u64 record_id) | |
592 | { | |
593 | pr_unimpl_nvram(); | |
594 | return -ENOSYS; | |
595 | } | |
596 | ||
597 | int erst_write(const struct cper_record_header *record) | |
598 | { | |
599 | int rc; | |
600 | unsigned long flags; | |
601 | struct cper_record_header *rcd_erange; | |
602 | ||
603 | if (erst_disable) | |
604 | return -ENODEV; | |
605 | ||
606 | if (memcmp(record->signature, CPER_SIG_RECORD, CPER_SIG_SIZE)) | |
607 | return -EINVAL; | |
608 | ||
609 | if (erst_erange.attr & ERST_RANGE_NVRAM) { | |
610 | if (!spin_trylock_irqsave(&erst_lock, flags)) | |
611 | return -EBUSY; | |
612 | rc = __erst_write_to_nvram(record); | |
613 | spin_unlock_irqrestore(&erst_lock, flags); | |
614 | return rc; | |
615 | } | |
616 | ||
617 | if (record->record_length > erst_erange.size) | |
618 | return -EINVAL; | |
619 | ||
620 | if (!spin_trylock_irqsave(&erst_lock, flags)) | |
621 | return -EBUSY; | |
622 | memcpy(erst_erange.vaddr, record, record->record_length); | |
623 | rcd_erange = erst_erange.vaddr; | |
624 | /* signature for serialization system */ | |
625 | memcpy(&rcd_erange->persistence_information, "ER", 2); | |
626 | ||
627 | rc = __erst_write_to_storage(0); | |
628 | spin_unlock_irqrestore(&erst_lock, flags); | |
629 | ||
630 | return rc; | |
631 | } | |
632 | EXPORT_SYMBOL_GPL(erst_write); | |
633 | ||
634 | static int __erst_read_to_erange(u64 record_id, u64 *offset) | |
635 | { | |
636 | int rc; | |
637 | ||
638 | if (erst_erange.attr & ERST_RANGE_NVRAM) | |
639 | return __erst_read_to_erange_from_nvram( | |
640 | record_id, offset); | |
641 | ||
642 | rc = __erst_read_from_storage(record_id, 0); | |
643 | if (rc) | |
644 | return rc; | |
645 | *offset = 0; | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
650 | static ssize_t __erst_read(u64 record_id, struct cper_record_header *record, | |
651 | size_t buflen) | |
652 | { | |
653 | int rc; | |
654 | u64 offset, len = 0; | |
655 | struct cper_record_header *rcd_tmp; | |
656 | ||
657 | rc = __erst_read_to_erange(record_id, &offset); | |
658 | if (rc) | |
659 | return rc; | |
660 | rcd_tmp = erst_erange.vaddr + offset; | |
661 | len = rcd_tmp->record_length; | |
662 | if (len <= buflen) | |
663 | memcpy(record, rcd_tmp, len); | |
664 | ||
665 | return len; | |
666 | } | |
667 | ||
668 | /* | |
669 | * If return value > buflen, the buffer size is not big enough, | |
670 | * else if return value < 0, something goes wrong, | |
671 | * else everything is OK, and return value is record length | |
672 | */ | |
673 | ssize_t erst_read(u64 record_id, struct cper_record_header *record, | |
674 | size_t buflen) | |
675 | { | |
676 | ssize_t len; | |
677 | unsigned long flags; | |
678 | ||
679 | if (erst_disable) | |
680 | return -ENODEV; | |
681 | ||
682 | spin_lock_irqsave(&erst_lock, flags); | |
683 | len = __erst_read(record_id, record, buflen); | |
684 | spin_unlock_irqrestore(&erst_lock, flags); | |
685 | return len; | |
686 | } | |
687 | EXPORT_SYMBOL_GPL(erst_read); | |
688 | ||
689 | /* | |
690 | * If return value > buflen, the buffer size is not big enough, | |
691 | * else if return value = 0, there is no more record to read, | |
692 | * else if return value < 0, something goes wrong, | |
693 | * else everything is OK, and return value is record length | |
694 | */ | |
695 | ssize_t erst_read_next(struct cper_record_header *record, size_t buflen) | |
696 | { | |
697 | int rc; | |
698 | ssize_t len; | |
699 | unsigned long flags; | |
700 | u64 record_id; | |
701 | ||
702 | if (erst_disable) | |
703 | return -ENODEV; | |
704 | ||
705 | spin_lock_irqsave(&erst_lock, flags); | |
706 | rc = __erst_get_next_record_id(&record_id); | |
707 | if (rc) { | |
708 | spin_unlock_irqrestore(&erst_lock, flags); | |
709 | return rc; | |
710 | } | |
711 | /* no more record */ | |
712 | if (record_id == APEI_ERST_INVALID_RECORD_ID) { | |
713 | spin_unlock_irqrestore(&erst_lock, flags); | |
714 | return 0; | |
715 | } | |
716 | ||
717 | len = __erst_read(record_id, record, buflen); | |
718 | spin_unlock_irqrestore(&erst_lock, flags); | |
719 | ||
720 | return len; | |
721 | } | |
722 | EXPORT_SYMBOL_GPL(erst_read_next); | |
723 | ||
724 | int erst_clear(u64 record_id) | |
725 | { | |
726 | int rc; | |
727 | unsigned long flags; | |
728 | ||
729 | if (erst_disable) | |
730 | return -ENODEV; | |
731 | ||
732 | spin_lock_irqsave(&erst_lock, flags); | |
733 | if (erst_erange.attr & ERST_RANGE_NVRAM) | |
734 | rc = __erst_clear_from_nvram(record_id); | |
735 | else | |
736 | rc = __erst_clear_from_storage(record_id); | |
737 | spin_unlock_irqrestore(&erst_lock, flags); | |
738 | ||
739 | return rc; | |
740 | } | |
741 | EXPORT_SYMBOL_GPL(erst_clear); | |
742 | ||
743 | static int __init setup_erst_disable(char *str) | |
744 | { | |
745 | erst_disable = 1; | |
746 | return 0; | |
747 | } | |
748 | ||
749 | __setup("erst_disable", setup_erst_disable); | |
750 | ||
751 | static int erst_check_table(struct acpi_table_erst *erst_tab) | |
752 | { | |
753 | if (erst_tab->header_length != sizeof(struct acpi_table_erst)) | |
754 | return -EINVAL; | |
755 | if (erst_tab->header.length < sizeof(struct acpi_table_erst)) | |
756 | return -EINVAL; | |
757 | if (erst_tab->entries != | |
758 | (erst_tab->header.length - sizeof(struct acpi_table_erst)) / | |
759 | sizeof(struct acpi_erst_entry)) | |
760 | return -EINVAL; | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
765 | static int __init erst_init(void) | |
766 | { | |
767 | int rc = 0; | |
768 | acpi_status status; | |
769 | struct apei_exec_context ctx; | |
770 | struct apei_resources erst_resources; | |
771 | struct resource *r; | |
772 | ||
773 | if (acpi_disabled) | |
774 | goto err; | |
775 | ||
776 | if (erst_disable) { | |
777 | pr_info(ERST_PFX | |
778 | "Error Record Serialization Table (ERST) support is disabled.\n"); | |
779 | goto err; | |
780 | } | |
781 | ||
782 | status = acpi_get_table(ACPI_SIG_ERST, 0, | |
783 | (struct acpi_table_header **)&erst_tab); | |
784 | if (status == AE_NOT_FOUND) { | |
980533b0 | 785 | pr_info(ERST_PFX "Table is not found!\n"); |
a08f82d0 HY |
786 | goto err; |
787 | } else if (ACPI_FAILURE(status)) { | |
788 | const char *msg = acpi_format_exception(status); | |
789 | pr_err(ERST_PFX "Failed to get table, %s\n", msg); | |
790 | rc = -EINVAL; | |
791 | goto err; | |
792 | } | |
793 | ||
794 | rc = erst_check_table(erst_tab); | |
795 | if (rc) { | |
796 | pr_err(FW_BUG ERST_PFX "ERST table is invalid\n"); | |
797 | goto err; | |
798 | } | |
799 | ||
800 | apei_resources_init(&erst_resources); | |
801 | erst_exec_ctx_init(&ctx); | |
802 | rc = apei_exec_collect_resources(&ctx, &erst_resources); | |
803 | if (rc) | |
804 | goto err_fini; | |
805 | rc = apei_resources_request(&erst_resources, "APEI ERST"); | |
806 | if (rc) | |
807 | goto err_fini; | |
808 | rc = apei_exec_pre_map_gars(&ctx); | |
809 | if (rc) | |
810 | goto err_release; | |
811 | rc = erst_get_erange(&erst_erange); | |
812 | if (rc) { | |
813 | if (rc == -ENODEV) | |
814 | pr_info(ERST_PFX | |
815 | "The corresponding hardware device or firmware implementation " | |
816 | "is not available.\n"); | |
817 | else | |
818 | pr_err(ERST_PFX | |
819 | "Failed to get Error Log Address Range.\n"); | |
820 | goto err_unmap_reg; | |
821 | } | |
822 | ||
823 | r = request_mem_region(erst_erange.base, erst_erange.size, "APEI ERST"); | |
824 | if (!r) { | |
825 | pr_err(ERST_PFX | |
826 | "Can not request iomem region <0x%16llx-0x%16llx> for ERST.\n", | |
827 | (unsigned long long)erst_erange.base, | |
828 | (unsigned long long)erst_erange.base + erst_erange.size); | |
829 | rc = -EIO; | |
830 | goto err_unmap_reg; | |
831 | } | |
832 | rc = -ENOMEM; | |
833 | erst_erange.vaddr = ioremap_cache(erst_erange.base, | |
834 | erst_erange.size); | |
835 | if (!erst_erange.vaddr) | |
836 | goto err_release_erange; | |
837 | ||
838 | pr_info(ERST_PFX | |
839 | "Error Record Serialization Table (ERST) support is initialized.\n"); | |
840 | ||
841 | return 0; | |
842 | ||
843 | err_release_erange: | |
844 | release_mem_region(erst_erange.base, erst_erange.size); | |
845 | err_unmap_reg: | |
846 | apei_exec_post_unmap_gars(&ctx); | |
847 | err_release: | |
848 | apei_resources_release(&erst_resources); | |
849 | err_fini: | |
850 | apei_resources_fini(&erst_resources); | |
851 | err: | |
852 | erst_disable = 1; | |
853 | return rc; | |
854 | } | |
855 | ||
856 | device_initcall(erst_init); |