summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/sysfs.c
blob: a5cc4f3bb1e31df56953098b75792daca9b0aa6e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
// SPDX-License-Identifier: GPL-2.0
/*
 * sysfs.c - ACPI sysfs interface to userspace.
 */

#define pr_fmt(fmt) "ACPI: " fmt

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/acpi.h>

#include "internal.h"

#define _COMPONENT		ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME("sysfs");

#ifdef CONFIG_ACPI_DEBUG
/*
 * ACPI debug sysfs I/F, including:
 * /sys/modules/acpi/parameters/debug_layer
 * /sys/modules/acpi/parameters/debug_level
 * /sys/modules/acpi/parameters/trace_method_name
 * /sys/modules/acpi/parameters/trace_state
 * /sys/modules/acpi/parameters/trace_debug_layer
 * /sys/modules/acpi/parameters/trace_debug_level
 */

struct acpi_dlayer {
	const char *name;
	unsigned long value;
};
struct acpi_dlevel {
	const char *name;
	unsigned long value;
};
#define ACPI_DEBUG_INIT(v)	{ .name = #v, .value = v }

static const struct acpi_dlayer acpi_debug_layers[] = {
	ACPI_DEBUG_INIT(ACPI_UTILITIES),
	ACPI_DEBUG_INIT(ACPI_HARDWARE),
	ACPI_DEBUG_INIT(ACPI_EVENTS),
	ACPI_DEBUG_INIT(ACPI_TABLES),
	ACPI_DEBUG_INIT(ACPI_NAMESPACE),
	ACPI_DEBUG_INIT(ACPI_PARSER),
	ACPI_DEBUG_INIT(ACPI_DISPATCHER),
	ACPI_DEBUG_INIT(ACPI_EXECUTER),
	ACPI_DEBUG_INIT(ACPI_RESOURCES),
	ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
	ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
	ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
	ACPI_DEBUG_INIT(ACPI_COMPILER),
	ACPI_DEBUG_INIT(ACPI_TOOLS),

	ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
	ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
};

static const struct acpi_dlevel acpi_debug_levels[] = {
	ACPI_DEBUG_INIT(ACPI_LV_INIT),
	ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
	ACPI_DEBUG_INIT(ACPI_LV_INFO),
	ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
	ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),

	ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
	ACPI_DEBUG_INIT(ACPI_LV_PARSE),
	ACPI_DEBUG_INIT(ACPI_LV_LOAD),
	ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
	ACPI_DEBUG_INIT(ACPI_LV_EXEC),
	ACPI_DEBUG_INIT(ACPI_LV_NAMES),
	ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
	ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
	ACPI_DEBUG_INIT(ACPI_LV_TABLES),
	ACPI_DEBUG_INIT(ACPI_LV_VALUES),
	ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
	ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
	ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
	ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),

	ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
	ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
	ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),

	ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
	ACPI_DEBUG_INIT(ACPI_LV_THREADS),
	ACPI_DEBUG_INIT(ACPI_LV_IO),
	ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),

	ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
	ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
	ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
	ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
};

static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
{
	int result = 0;
	int i;

	result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");

	for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
		result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
				  acpi_debug_layers[i].name,
				  acpi_debug_layers[i].value,
				  (acpi_dbg_layer & acpi_debug_layers[i].value)
				  ? '*' : ' ');
	}
	result +=
	    sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
		    ACPI_ALL_DRIVERS,
		    (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
		    ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
		    == 0 ? ' ' : '-');
	result +=
	    sprintf(buffer + result,
		    "--\ndebug_layer = 0x%08X ( * = enabled)\n",
		    acpi_dbg_layer);

	return result;
}

static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
{
	int result = 0;
	int i;

	result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");

	for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
		result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
				  acpi_debug_levels[i].name,
				  acpi_debug_levels[i].value,
				  (acpi_dbg_level & acpi_debug_levels[i].value)
				  ? '*' : ' ');
	}
	result +=
	    sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
		    acpi_dbg_level);

	return result;
}

static const struct kernel_param_ops param_ops_debug_layer = {
	.set = param_set_uint,
	.get = param_get_debug_layer,
};

static const struct kernel_param_ops param_ops_debug_level = {
	.set = param_set_uint,
	.get = param_get_debug_level,
};

module_param_cb(debug_layer, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);

static char trace_method_name[1024];

static int param_set_trace_method_name(const char *val,
				       const struct kernel_param *kp)
{
	u32 saved_flags = 0;
	bool is_abs_path = true;

	if (*val != '\\')
		is_abs_path = false;

	if ((is_abs_path && strlen(val) > 1023) ||
	    (!is_abs_path && strlen(val) > 1022)) {
		pr_err("%s: string parameter too long\n", kp->name);
		return -ENOSPC;
	}

	/*
	 * It's not safe to update acpi_gbl_trace_method_name without
	 * having the tracer stopped, so we save the original tracer
	 * state and disable it.
	 */
	saved_flags = acpi_gbl_trace_flags;
	(void)acpi_debug_trace(NULL,
			       acpi_gbl_trace_dbg_level,
			       acpi_gbl_trace_dbg_layer,
			       0);

	/* This is a hack.  We can't kmalloc in early boot. */
	if (is_abs_path)
		strcpy(trace_method_name, val);
	else {
		trace_method_name[0] = '\\';
		strcpy(trace_method_name+1, val);
	}

	/* Restore the original tracer state */
	(void)acpi_debug_trace(trace_method_name,
			       acpi_gbl_trace_dbg_level,
			       acpi_gbl_trace_dbg_layer,
			       saved_flags);

	return 0;
}

static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
{
	return scnprintf(buffer, PAGE_SIZE, "%s\n", acpi_gbl_trace_method_name);
}

static const struct kernel_param_ops param_ops_trace_method = {
	.set = param_set_trace_method_name,
	.get = param_get_trace_method_name,
};

static const struct kernel_param_ops param_ops_trace_attrib = {
	.set = param_set_uint,
	.get = param_get_uint,
};

module_param_cb(trace_method_name, &param_ops_trace_method, &trace_method_name, 0644);
module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
module_param_cb(trace_debug_level, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);

static int param_set_trace_state(const char *val,
				 const struct kernel_param *kp)
{
	acpi_status status;
	const char *method = trace_method_name;
	u32 flags = 0;

/* So "xxx-once" comparison should go prior than "xxx" comparison */
#define acpi_compare_param(val, key)	\
	strncmp((val), (key), sizeof(key) - 1)

	if (!acpi_compare_param(val, "enable")) {
		method = NULL;
		flags = ACPI_TRACE_ENABLED;
	} else if (!acpi_compare_param(val, "disable"))
		method = NULL;
	else if (!acpi_compare_param(val, "method-once"))
		flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
	else if (!acpi_compare_param(val, "method"))
		flags = ACPI_TRACE_ENABLED;
	else if (!acpi_compare_param(val, "opcode-once"))
		flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
	else if (!acpi_compare_param(val, "opcode"))
		flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
	else
		return -EINVAL;

	status = acpi_debug_trace(method,
				  acpi_gbl_trace_dbg_level,
				  acpi_gbl_trace_dbg_layer,
				  flags);
	if (ACPI_FAILURE(status))
		return -EBUSY;

	return 0;
}

static int param_get_trace_state(char *buffer, const struct kernel_param *kp)
{
	if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
		return sprintf(buffer, "disable\n");
	else {
		if (acpi_gbl_trace_method_name) {
			if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
				return sprintf(buffer, "method-once\n");
			else
				return sprintf(buffer, "method\n");
		} else
			return sprintf(buffer, "enable\n");
	}
	return 0;
}

module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
		  NULL, 0644);
#endif /* CONFIG_ACPI_DEBUG */


/* /sys/modules/acpi/parameters/aml_debug_output */

module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
		   byte, 0644);
MODULE_PARM_DESC(aml_debug_output,
		 "To enable/disable the ACPI Debug Object output.");

/* /sys/module/acpi/parameters/acpica_version */
static int param_get_acpica_version(char *buffer,
				    const struct kernel_param *kp)
{
	int result;

	result = sprintf(buffer, "%x\n", ACPI_CA_VERSION);

	return result;
}

module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);

/*
 * ACPI table sysfs I/F:
 * /sys/firmware/acpi/tables/
 * /sys/firmware/acpi/tables/data/
 * /sys/firmware/acpi/tables/dynamic/
 */

static LIST_HEAD(acpi_table_attr_list);
static struct kobject *tables_kobj;
static struct kobject *tables_data_kobj;
static struct kobject *dynamic_tables_kobj;
static struct kobject *hotplug_kobj;

#define ACPI_MAX_TABLE_INSTANCES	999
#define ACPI_INST_SIZE			4 /* including trailing 0 */

struct acpi_table_attr {
	struct bin_attribute attr;
	char name[ACPI_NAMESEG_SIZE];
	int instance;
	char filename[ACPI_NAMESEG_SIZE+ACPI_INST_SIZE];
	struct list_head node;
};

struct acpi_data_attr {
	struct bin_attribute attr;
	u64	addr;
};

static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
			       struct bin_attribute *bin_attr, char *buf,
			       loff_t offset, size_t count)
{
	struct acpi_table_attr *table_attr =
	    container_of(bin_attr, struct acpi_table_attr, attr);
	struct acpi_table_header *table_header = NULL;
	acpi_status status;
	ssize_t rc;

	status = acpi_get_table(table_attr->name, table_attr->instance,
				&table_header);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	rc = memory_read_from_buffer(buf, count, &offset, table_header,
			table_header->length);
	acpi_put_table(table_header);
	return rc;
}

static int acpi_table_attr_init(struct kobject *tables_obj,
				struct acpi_table_attr *table_attr,
				struct acpi_table_header *table_header)
{
	struct acpi_table_header *header = NULL;
	struct acpi_table_attr *attr = NULL;
	char instance_str[ACPI_INST_SIZE];

	sysfs_attr_init(&table_attr->attr.attr);
	ACPI_COPY_NAMESEG(table_attr->name, table_header->signature);

	list_for_each_entry(attr, &acpi_table_attr_list, node) {
		if (ACPI_COMPARE_NAMESEG(table_attr->name, attr->name))
			if (table_attr->instance < attr->instance)
				table_attr->instance = attr->instance;
	}
	table_attr->instance++;
	if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) {
		pr_warn("%4.4s: too many table instances\n",
			table_attr->name);
		return -ERANGE;
	}

	ACPI_COPY_NAMESEG(table_attr->filename, table_header->signature);
	table_attr->filename[ACPI_NAMESEG_SIZE] = '\0';
	if (table_attr->instance > 1 || (table_attr->instance == 1 &&
					 !acpi_get_table
					 (table_header->signature, 2, &header))) {
		snprintf(instance_str, sizeof(instance_str), "%u",
			 table_attr->instance);
		strcat(table_attr->filename, instance_str);
	}

	table_attr->attr.size = table_header->length;
	table_attr->attr.read = acpi_table_show;
	table_attr->attr.attr.name = table_attr->filename;
	table_attr->attr.attr.mode = 0400;

	return sysfs_create_bin_file(tables_obj, &table_attr->attr);
}

acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
{
	struct acpi_table_attr *table_attr;

	switch (event) {
	case ACPI_TABLE_EVENT_INSTALL:
		table_attr =
		    kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
		if (!table_attr)
			return AE_NO_MEMORY;

		if (acpi_table_attr_init(dynamic_tables_kobj,
					 table_attr, table)) {
			kfree(table_attr);
			return AE_ERROR;
		}
		list_add_tail(&table_attr->node, &acpi_table_attr_list);
		break;
	case ACPI_TABLE_EVENT_LOAD:
	case ACPI_TABLE_EVENT_UNLOAD:
	case ACPI_TABLE_EVENT_UNINSTALL:
		/*
		 * we do not need to do anything right now
		 * because the table is not deleted from the
		 * global table list when unloading it.
		 */
		break;
	default:
		return AE_BAD_PARAMETER;
	}
	return AE_OK;
}

static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj,
			      struct bin_attribute *bin_attr, char *buf,
			      loff_t offset, size_t count)
{
	struct acpi_data_attr *data_attr;
	void __iomem *base;
	ssize_t rc;

	data_attr = container_of(bin_attr, struct acpi_data_attr, attr);

	base = acpi_os_map_memory(data_attr->addr, data_attr->attr.size);
	if (!base)
		return -ENOMEM;
	rc = memory_read_from_buffer(buf, count, &offset, base,
				     data_attr->attr.size);
	acpi_os_unmap_memory(base, data_attr->attr.size);

	return rc;
}

static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr)
{
	struct acpi_table_bert *bert = th;

	if (bert->header.length < sizeof(struct acpi_table_bert) ||
	    bert->region_length < sizeof(struct acpi_hest_generic_status)) {
		kfree(data_attr);
		return -EINVAL;
	}
	data_attr->addr = bert->address;
	data_attr->attr.size = bert->region_length;
	data_attr->attr.attr.name = "BERT";

	return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr);
}

static struct acpi_data_obj {
	char *name;
	int (*fn)(void *, struct acpi_data_attr *);
} acpi_data_objs[] = {
	{ ACPI_SIG_BERT, acpi_bert_data_init },
};

#define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)

static int acpi_table_data_init(struct acpi_table_header *th)
{
	struct acpi_data_attr *data_attr;
	int i;

	for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) {
		if (ACPI_COMPARE_NAMESEG(th->signature, acpi_data_objs[i].name)) {
			data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL);
			if (!data_attr)
				return -ENOMEM;
			sysfs_attr_init(&data_attr->attr.attr);
			data_attr->attr.read = acpi_data_show;
			data_attr->attr.attr.mode = 0400;
			return acpi_data_objs[i].fn(th, data_attr);
		}
	}
	return 0;
}

static int acpi_tables_sysfs_init(void)
{
	struct acpi_table_attr *table_attr;
	struct acpi_table_header *table_header = NULL;
	int table_index;
	acpi_status status;
	int ret;

	tables_kobj = kobject_create_and_add("tables", acpi_kobj);
	if (!tables_kobj)
		goto err;

	tables_data_kobj = kobject_create_and_add("data", tables_kobj);
	if (!tables_data_kobj)
		goto err_tables_data;

	dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
	if (!dynamic_tables_kobj)
		goto err_dynamic_tables;

	for (table_index = 0;; table_index++) {
		status = acpi_get_table_by_index(table_index, &table_header);

		if (status == AE_BAD_PARAMETER)
			break;

		if (ACPI_FAILURE(status))
			continue;

		table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
		if (!table_attr)
			return -ENOMEM;

		ret = acpi_table_attr_init(tables_kobj,
					   table_attr, table_header);
		if (ret) {
			kfree(table_attr);
			return ret;
		}
		list_add_tail(&table_attr->node, &acpi_table_attr_list);
		acpi_table_data_init(table_header);
	}

	kobject_uevent(tables_kobj, KOBJ_ADD);
	kobject_uevent(tables_data_kobj, KOBJ_ADD);
	kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);

	return 0;
err_dynamic_tables:
	kobject_put(tables_data_kobj);
err_tables_data:
	kobject_put(tables_kobj);
err:
	return -ENOMEM;
}

/*
 * Detailed ACPI IRQ counters:
 * /sys/firmware/acpi/interrupts/
 */

u32 acpi_irq_handled;
u32 acpi_irq_not_handled;

#define COUNT_GPE 0
#define COUNT_SCI 1		/* acpi_irq_handled */
#define COUNT_SCI_NOT 2		/* acpi_irq_not_handled */
#define COUNT_ERROR 3		/* other */
#define NUM_COUNTERS_EXTRA 4

struct event_counter {
	u32 count;
	u32 flags;
};

static struct event_counter *all_counters;
static u32 num_gpes;
static u32 num_counters;
static struct attribute **all_attrs;
static u32 acpi_gpe_count;

static struct attribute_group interrupt_stats_attr_group = {
	.name = "interrupts",
};

static struct kobj_attribute *counter_attrs;

static void delete_gpe_attr_array(void)
{
	struct event_counter *tmp = all_counters;

	all_counters = NULL;
	kfree(tmp);

	if (counter_attrs) {
		int i;

		for (i = 0; i < num_gpes; i++)
			kfree(counter_attrs[i].attr.name);

		kfree(counter_attrs);
	}
	kfree(all_attrs);

	return;
}

static void gpe_count(u32 gpe_number)
{
	acpi_gpe_count++;

	if (!all_counters)
		return;

	if (gpe_number < num_gpes)
		all_counters[gpe_number].count++;
	else
		all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
			     COUNT_ERROR].count++;

	return;
}

static void fixed_event_count(u32 event_number)
{
	if (!all_counters)
		return;

	if (event_number < ACPI_NUM_FIXED_EVENTS)
		all_counters[num_gpes + event_number].count++;
	else
		all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
			     COUNT_ERROR].count++;

	return;
}

static void acpi_global_event_handler(u32 event_type, acpi_handle device,
	u32 event_number, void *context)
{
	if (event_type == ACPI_EVENT_TYPE_GPE) {
		gpe_count(event_number);
		pr_debug("GPE event 0x%02x\n", event_number);
	} else if (event_type == ACPI_EVENT_TYPE_FIXED) {
		fixed_event_count(event_number);
		pr_debug("Fixed event 0x%02x\n", event_number);
	} else {
		pr_debug("Other event 0x%02x\n", event_number);
	}
}

static int get_status(u32 index, acpi_event_status *ret,
		      acpi_handle *handle)
{
	acpi_status status;

	if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
		return -EINVAL;

	if (index < num_gpes) {
		status = acpi_get_gpe_device(index, handle);
		if (ACPI_FAILURE(status)) {
			ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
					"Invalid GPE 0x%x", index));
			return -ENXIO;
		}
		status = acpi_get_gpe_status(*handle, index, ret);
	} else {
		status = acpi_get_event_status(index - num_gpes, ret);
	}
	if (ACPI_FAILURE(status))
		return -EIO;

	return 0;
}

static ssize_t counter_show(struct kobject *kobj,
			    struct kobj_attribute *attr, char *buf)
{
	int index = attr - counter_attrs;
	int size;
	acpi_handle handle;
	acpi_event_status status;
	int result = 0;

	all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
	    acpi_irq_handled;
	all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
	    acpi_irq_not_handled;
	all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
	    acpi_gpe_count;
	size = sprintf(buf, "%8u", all_counters[index].count);

	/* "gpe_all" or "sci" */
	if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
		goto end;

	result = get_status(index, &status, &handle);
	if (result)
		goto end;

	if (status & ACPI_EVENT_FLAG_ENABLE_SET)
		size += sprintf(buf + size, "  EN");
	else
		size += sprintf(buf + size, "    ");
	if (status & ACPI_EVENT_FLAG_STATUS_SET)
		size += sprintf(buf + size, " STS");
	else
		size += sprintf(buf + size, "    ");

	if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
		size += sprintf(buf + size, " invalid     ");
	else if (status & ACPI_EVENT_FLAG_ENABLED)
		size += sprintf(buf + size, " enabled     ");
	else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
		size += sprintf(buf + size, " wake_enabled");
	else
		size += sprintf(buf + size, " disabled    ");
	if (status & ACPI_EVENT_FLAG_MASKED)
		size += sprintf(buf + size, " masked  ");
	else
		size += sprintf(buf + size, " unmasked");

end:
	size += sprintf(buf + size, "\n");
	return result ? result : size;
}

/*
 * counter_set() sets the specified counter.
 * setting the total "sci" file to any value clears all counters.
 * enable/disable/clear a gpe/fixed event in user space.
 */
static ssize_t counter_set(struct kobject *kobj,
			   struct kobj_attribute *attr, const char *buf,
			   size_t size)
{
	int index = attr - counter_attrs;
	acpi_event_status status;
	acpi_handle handle;
	int result = 0;
	unsigned long tmp;

	if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
		int i;
		for (i = 0; i < num_counters; ++i)
			all_counters[i].count = 0;
		acpi_gpe_count = 0;
		acpi_irq_handled = 0;
		acpi_irq_not_handled = 0;
		goto end;
	}

	/* show the event status for both GPEs and Fixed Events */
	result = get_status(index, &status, &handle);
	if (result)
		goto end;

	if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
		printk(KERN_WARNING PREFIX
		       "Can not change Invalid GPE/Fixed Event status\n");
		return -EINVAL;
	}

	if (index < num_gpes) {
		if (!strcmp(buf, "disable\n") &&
		    (status & ACPI_EVENT_FLAG_ENABLED))
			result = acpi_disable_gpe(handle, index);
		else if (!strcmp(buf, "enable\n") &&
			 !(status & ACPI_EVENT_FLAG_ENABLED))
			result = acpi_enable_gpe(handle, index);
		else if (!strcmp(buf, "clear\n") &&
			 (status & ACPI_EVENT_FLAG_STATUS_SET))
			result = acpi_clear_gpe(handle, index);
		else if (!strcmp(buf, "mask\n"))
			result = acpi_mask_gpe(handle, index, TRUE);
		else if (!strcmp(buf, "unmask\n"))
			result = acpi_mask_gpe(handle, index, FALSE);
		else if (!kstrtoul(buf, 0, &tmp))
			all_counters[index].count = tmp;
		else
			result = -EINVAL;
	} else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
		int event = index - num_gpes;
		if (!strcmp(buf, "disable\n") &&
		    (status & ACPI_EVENT_FLAG_ENABLE_SET))
			result = acpi_disable_event(event, ACPI_NOT_ISR);
		else if (!strcmp(buf, "enable\n") &&
			 !(status & ACPI_EVENT_FLAG_ENABLE_SET))
			result = acpi_enable_event(event, ACPI_NOT_ISR);
		else if (!strcmp(buf, "clear\n") &&
			 (status & ACPI_EVENT_FLAG_STATUS_SET))
			result = acpi_clear_event(event);
		else if (!kstrtoul(buf, 0, &tmp))
			all_counters[index].count = tmp;
		else
			result = -EINVAL;
	} else
		all_counters[index].count = strtoul(buf, NULL, 0);

	if (ACPI_FAILURE(result))
		result = -EINVAL;
end:
	return result ? result : size;
}

/*
 * A Quirk Mechanism for GPE Flooding Prevention:
 *
 * Quirks may be needed to prevent GPE flooding on a specific GPE. The
 * flooding typically cannot be detected and automatically prevented by
 * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
 * the AML tables. This normally indicates a feature gap in Linux, thus
 * instead of providing endless quirk tables, we provide a boot parameter
 * for those who want this quirk. For example, if the users want to prevent
 * the GPE flooding for GPE 00, they need to specify the following boot
 * parameter:
 *   acpi_mask_gpe=0x00
 * The masking status can be modified by the following runtime controlling
 * interface:
 *   echo unmask > /sys/firmware/acpi/interrupts/gpe00
 */
#define ACPI_MASKABLE_GPE_MAX	0x100
static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;

static int __init acpi_gpe_set_masked_gpes(char *val)
{
	u8 gpe;

	if (kstrtou8(val, 0, &gpe))
		return -EINVAL;
	set_bit(gpe, acpi_masked_gpes_map);

	return 1;
}
__setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);

void __init acpi_gpe_apply_masked_gpes(void)
{
	acpi_handle handle;
	acpi_status status;
	u16 gpe;

	for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) {
		status = acpi_get_gpe_device(gpe, &handle);
		if (ACPI_SUCCESS(status)) {
			pr_info("Masking GPE 0x%x.\n", gpe);
			(void)acpi_mask_gpe(handle, gpe, TRUE);
		}
	}
}

void acpi_irq_stats_init(void)
{
	acpi_status status;
	int i;

	if (all_counters)
		return;

	num_gpes = acpi_current_gpe_count;
	num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;

	all_attrs = kcalloc(num_counters + 1, sizeof(struct attribute *),
			    GFP_KERNEL);
	if (all_attrs == NULL)
		return;

	all_counters = kcalloc(num_counters, sizeof(struct event_counter),
			       GFP_KERNEL);
	if (all_counters == NULL)
		goto fail;

	status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
	if (ACPI_FAILURE(status))
		goto fail;

	counter_attrs = kcalloc(num_counters, sizeof(struct kobj_attribute),
				GFP_KERNEL);
	if (counter_attrs == NULL)
		goto fail;

	for (i = 0; i < num_counters; ++i) {
		char buffer[12];
		char *name;

		if (i < num_gpes)
			sprintf(buffer, "gpe%02X", i);
		else if (i == num_gpes + ACPI_EVENT_PMTIMER)
			sprintf(buffer, "ff_pmtimer");
		else if (i == num_gpes + ACPI_EVENT_GLOBAL)
			sprintf(buffer, "ff_gbl_lock");
		else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
			sprintf(buffer, "ff_pwr_btn");
		else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
			sprintf(buffer, "ff_slp_btn");
		else if (i == num_gpes + ACPI_EVENT_RTC)
			sprintf(buffer, "ff_rt_clk");
		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
			sprintf(buffer, "gpe_all");
		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
			sprintf(buffer, "sci");
		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
			sprintf(buffer, "sci_not");
		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
			sprintf(buffer, "error");
		else
			sprintf(buffer, "bug%02X", i);

		name = kstrdup(buffer, GFP_KERNEL);
		if (name == NULL)
			goto fail;

		sysfs_attr_init(&counter_attrs[i].attr);
		counter_attrs[i].attr.name = name;
		counter_attrs[i].attr.mode = 0644;
		counter_attrs[i].show = counter_show;
		counter_attrs[i].store = counter_set;

		all_attrs[i] = &counter_attrs[i].attr;
	}

	interrupt_stats_attr_group.attrs = all_attrs;
	if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
		return;

fail:
	delete_gpe_attr_array();
	return;
}

static void __exit interrupt_stats_exit(void)
{
	sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);

	delete_gpe_attr_array();

	return;
}

static ssize_t
acpi_show_profile(struct kobject *kobj, struct kobj_attribute *attr,
		  char *buf)
{
	return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
}

static const struct kobj_attribute pm_profile_attr =
	__ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);

static ssize_t hotplug_enabled_show(struct kobject *kobj,
				    struct kobj_attribute *attr, char *buf)
{
	struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);

	return sprintf(buf, "%d\n", hotplug->enabled);
}

static ssize_t hotplug_enabled_store(struct kobject *kobj,
				     struct kobj_attribute *attr,
				     const char *buf, size_t size)
{
	struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
	unsigned int val;

	if (kstrtouint(buf, 10, &val) || val > 1)
		return -EINVAL;

	acpi_scan_hotplug_enabled(hotplug, val);
	return size;
}

static struct kobj_attribute hotplug_enabled_attr =
	__ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
		hotplug_enabled_store);

static struct attribute *hotplug_profile_attrs[] = {
	&hotplug_enabled_attr.attr,
	NULL
};

static struct kobj_type acpi_hotplug_profile_ktype = {
	.sysfs_ops = &kobj_sysfs_ops,
	.default_attrs = hotplug_profile_attrs,
};

void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
				    const char *name)
{
	int error;

	if (!hotplug_kobj)
		goto err_out;

	error = kobject_init_and_add(&hotplug->kobj,
		&acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
	if (error) {
		kobject_put(&hotplug->kobj);
		goto err_out;
	}

	kobject_uevent(&hotplug->kobj, KOBJ_ADD);
	return;

 err_out:
	pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
}

static ssize_t force_remove_show(struct kobject *kobj,
				 struct kobj_attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", 0);
}

static ssize_t force_remove_store(struct kobject *kobj,
				  struct kobj_attribute *attr,
				  const char *buf, size_t size)
{
	bool val;
	int ret;

	ret = strtobool(buf, &val);
	if (ret < 0)
		return ret;

	if (val) {
		pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
		return -EINVAL;
	}
	return size;
}

static const struct kobj_attribute force_remove_attr =
	__ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
	       force_remove_store);

int __init acpi_sysfs_init(void)
{
	int result;

	result = acpi_tables_sysfs_init();
	if (result)
		return result;

	hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
	if (!hotplug_kobj)
		return -ENOMEM;

	result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
	if (result)
		return result;

	result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
	return result;
}