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Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[net-next-2.6.git] / drivers / acpi / apei / erst.c
CommitLineData
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>
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
59int erst_disable;
60EXPORT_SYMBOL_GPL(erst_disable);
61
62static 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 */
73static 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 */
88static DEFINE_SPINLOCK(erst_lock);
89
90static 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
107static 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
120static 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
126static 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
132static 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
138static 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
145static 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
152static 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
166static 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
180static 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
197static 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
226static 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
244static 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
251static 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
257static 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
263static 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
279static 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
358static 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
364static 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
386static 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
398ssize_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}
412EXPORT_SYMBOL_GPL(erst_get_record_count);
413
414static 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 */
433int 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}
447EXPORT_SYMBOL_GPL(erst_get_next_record_id);
448
449static 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
488static 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
531static 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 */
571static 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
578static 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
584static int __erst_read_to_erange_from_nvram(u64 record_id, u64 *offset)
585{
586 pr_unimpl_nvram();
587 return -ENOSYS;
588}
589
590static int __erst_clear_from_nvram(u64 record_id)
591{
592 pr_unimpl_nvram();
593 return -ENOSYS;
594}
595
596int 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}
631EXPORT_SYMBOL_GPL(erst_write);
632
633static 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
649static 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 */
672ssize_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}
686EXPORT_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 */
694ssize_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}
721EXPORT_SYMBOL_GPL(erst_read_next);
722
723int 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}
740EXPORT_SYMBOL_GPL(erst_clear);
741
742static 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
750static 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
764static 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) {
980533b0 784 pr_info(ERST_PFX "Table is not found!\n");
a08f82d0
HY		 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
842err_release_erange:
843 release_mem_region(erst_erange.base, erst_erange.size);
844err_unmap_reg:
845 apei_exec_post_unmap_gars(&ctx);
846err_release:
847 apei_resources_release(&erst_resources);
848err_fini:
849 apei_resources_fini(&erst_resources);
850err:
851 erst_disable = 1;
852 return rc;
853}
854
855device_initcall(erst_init);
Clone of davem's net-next-2.6 tree