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