aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/bus.c
blob: 48bc96d45babd103672cd7dacf996da8fd8c0890 (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
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
 *
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/proc_fs.h>
#include <linux/acpi.h>
#include <linux/slab.h>
#include <linux/regulator/machine.h>
#include <linux/workqueue.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#ifdef CONFIG_X86
#include <asm/mpspec.h>
#include <linux/dmi.h>
#endif
#include <linux/acpi_iort.h>
#include <linux/pci.h>
#include <acpi/apei.h>
#include <linux/suspend.h>

#include "internal.h"

#define _COMPONENT		ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("bus");

struct acpi_device *acpi_root;
struct proc_dir_entry *acpi_root_dir;
EXPORT_SYMBOL(acpi_root_dir);

#ifdef CONFIG_X86
#ifdef CONFIG_ACPI_CUSTOM_DSDT
static inline int set_copy_dsdt(const struct dmi_system_id *id)
{
	return 0;
}
#else
static int set_copy_dsdt(const struct dmi_system_id *id)
{
	printk(KERN_NOTICE "%s detected - "
		"force copy of DSDT to local memory\n", id->ident);
	acpi_gbl_copy_dsdt_locally = 1;
	return 0;
}
#endif

static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
	/*
	 * Invoke DSDT corruption work-around on all Toshiba Satellite.
	 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
	 */
	{
	 .callback = set_copy_dsdt,
	 .ident = "TOSHIBA Satellite",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
		DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
		},
	},
	{}
};
#endif

/* --------------------------------------------------------------------------
                                Device Management
   -------------------------------------------------------------------------- */

acpi_status acpi_bus_get_status_handle(acpi_handle handle,
				       unsigned long long *sta)
{
	acpi_status status;

	status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
	if (ACPI_SUCCESS(status))
		return AE_OK;

	if (status == AE_NOT_FOUND) {
		*sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
		       ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
		return AE_OK;
	}
	return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);

int acpi_bus_get_status(struct acpi_device *device)
{
	acpi_status status;
	unsigned long long sta;

	if (acpi_device_always_present(device)) {
		acpi_set_device_status(device, ACPI_STA_DEFAULT);
		return 0;
	}

	/* Battery devices must have their deps met before calling _STA */
	if (acpi_device_is_battery(device) && device->dep_unmet) {
		acpi_set_device_status(device, 0);
		return 0;
	}

	status = acpi_bus_get_status_handle(device->handle, &sta);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	acpi_set_device_status(device, sta);

	if (device->status.functional && !device->status.present) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
		       "functional but not present;\n",
			device->pnp.bus_id, (u32)sta));
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
			  device->pnp.bus_id, (u32)sta));
	return 0;
}
EXPORT_SYMBOL(acpi_bus_get_status);

void acpi_bus_private_data_handler(acpi_handle handle,
				   void *context)
{
	return;
}
EXPORT_SYMBOL(acpi_bus_private_data_handler);

int acpi_bus_attach_private_data(acpi_handle handle, void *data)
{
	acpi_status status;

	status = acpi_attach_data(handle,
			acpi_bus_private_data_handler, data);
	if (ACPI_FAILURE(status)) {
		acpi_handle_debug(handle, "Error attaching device data\n");
		return -ENODEV;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);

int acpi_bus_get_private_data(acpi_handle handle, void **data)
{
	acpi_status status;

	if (!*data)
		return -EINVAL;

	status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
	if (ACPI_FAILURE(status)) {
		acpi_handle_debug(handle, "No context for object\n");
		return -ENODEV;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);

void acpi_bus_detach_private_data(acpi_handle handle)
{
	acpi_detach_data(handle, acpi_bus_private_data_handler);
}
EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);

static void acpi_print_osc_error(acpi_handle handle,
				 struct acpi_osc_context *context, char *error)
{
	int i;

	acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);

	pr_debug("_OSC request data:");
	for (i = 0; i < context->cap.length; i += sizeof(u32))
		pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));

	pr_debug("\n");
}

acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
{
	acpi_status status;
	struct acpi_object_list input;
	union acpi_object in_params[4];
	union acpi_object *out_obj;
	guid_t guid;
	u32 errors;
	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};

	if (!context)
		return AE_ERROR;
	if (guid_parse(context->uuid_str, &guid))
		return AE_ERROR;
	context->ret.length = ACPI_ALLOCATE_BUFFER;
	context->ret.pointer = NULL;

	/* Setting up input parameters */
	input.count = 4;
	input.pointer = in_params;
	in_params[0].type 		= ACPI_TYPE_BUFFER;
	in_params[0].buffer.length 	= 16;
	in_params[0].buffer.pointer	= (u8 *)&guid;
	in_params[1].type 		= ACPI_TYPE_INTEGER;
	in_params[1].integer.value 	= context->rev;
	in_params[2].type 		= ACPI_TYPE_INTEGER;
	in_params[2].integer.value	= context->cap.length/sizeof(u32);
	in_params[3].type		= ACPI_TYPE_BUFFER;
	in_params[3].buffer.length 	= context->cap.length;
	in_params[3].buffer.pointer 	= context->cap.pointer;

	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
	if (ACPI_FAILURE(status))
		return status;

	if (!output.length)
		return AE_NULL_OBJECT;

	out_obj = output.pointer;
	if (out_obj->type != ACPI_TYPE_BUFFER
		|| out_obj->buffer.length != context->cap.length) {
		acpi_print_osc_error(handle, context,
			"_OSC evaluation returned wrong type");
		status = AE_TYPE;
		goto out_kfree;
	}
	/* Need to ignore the bit0 in result code */
	errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
	if (errors) {
		if (errors & OSC_REQUEST_ERROR)
			acpi_print_osc_error(handle, context,
				"_OSC request failed");
		if (errors & OSC_INVALID_UUID_ERROR)
			acpi_print_osc_error(handle, context,
				"_OSC invalid UUID");
		if (errors & OSC_INVALID_REVISION_ERROR)
			acpi_print_osc_error(handle, context,
				"_OSC invalid revision");
		if (errors & OSC_CAPABILITIES_MASK_ERROR) {
			if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
			    & OSC_QUERY_ENABLE)
				goto out_success;
			status = AE_SUPPORT;
			goto out_kfree;
		}
		status = AE_ERROR;
		goto out_kfree;
	}
out_success:
	context->ret.length = out_obj->buffer.length;
	context->ret.pointer = kmemdup(out_obj->buffer.pointer,
				       context->ret.length, GFP_KERNEL);
	if (!context->ret.pointer) {
		status =  AE_NO_MEMORY;
		goto out_kfree;
	}
	status =  AE_OK;

out_kfree:
	kfree(output.pointer);
	if (status != AE_OK)
		context->ret.pointer = NULL;
	return status;
}
EXPORT_SYMBOL(acpi_run_osc);

bool osc_sb_apei_support_acked;

/*
 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
 * OSPM supports platform coordinated low power idle(LPI) states
 */
bool osc_pc_lpi_support_confirmed;
EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);

static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
static void acpi_bus_osc_support(void)
{
	u32 capbuf[2];
	struct acpi_osc_context context = {
		.uuid_str = sb_uuid_str,
		.rev = 1,
		.cap.length = 8,
		.cap.pointer = capbuf,
	};
	acpi_handle handle;

	capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
	capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
	if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
	if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;

	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;

#ifdef CONFIG_X86
	if (boot_cpu_has(X86_FEATURE_HWP)) {
		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
	}
#endif

	if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;

	if (!ghes_disable)
		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
		return;
	if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
		u32 *capbuf_ret = context.ret.pointer;
		if (context.ret.length > OSC_SUPPORT_DWORD) {
			osc_sb_apei_support_acked =
				capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
			osc_pc_lpi_support_confirmed =
				capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
		}
		kfree(context.ret.pointer);
	}
	/* do we need to check other returned cap? Sounds no */
}

/* --------------------------------------------------------------------------
                             Notification Handling
   -------------------------------------------------------------------------- */

/**
 * acpi_bus_notify
 * ---------------
 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 */
static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
{
	struct acpi_device *adev;
	struct acpi_driver *driver;
	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
	bool hotplug_event = false;

	switch (type) {
	case ACPI_NOTIFY_BUS_CHECK:
		acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
		hotplug_event = true;
		break;

	case ACPI_NOTIFY_DEVICE_CHECK:
		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
		hotplug_event = true;
		break;

	case ACPI_NOTIFY_DEVICE_WAKE:
		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
		break;

	case ACPI_NOTIFY_EJECT_REQUEST:
		acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
		hotplug_event = true;
		break;

	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
		/* TBD: Exactly what does 'light' mean? */
		break;

	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
		acpi_handle_err(handle, "Device cannot be configured due "
				"to a frequency mismatch\n");
		break;

	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
		acpi_handle_err(handle, "Device cannot be configured due "
				"to a bus mode mismatch\n");
		break;

	case ACPI_NOTIFY_POWER_FAULT:
		acpi_handle_err(handle, "Device has suffered a power fault\n");
		break;

	default:
		acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
		break;
	}

	adev = acpi_bus_get_acpi_device(handle);
	if (!adev)
		goto err;

	driver = adev->driver;
	if (driver && driver->ops.notify &&
	    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
		driver->ops.notify(adev, type);

	if (!hotplug_event) {
		acpi_bus_put_acpi_device(adev);
		return;
	}

	if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
		return;

	acpi_bus_put_acpi_device(adev);

 err:
	acpi_evaluate_ost(handle, type, ost_code, NULL);
}

static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
{
	struct acpi_device *device = data;

	device->driver->ops.notify(device, event);
}

static void acpi_device_notify_fixed(void *data)
{
	struct acpi_device *device = data;

	/* Fixed hardware devices have no handles */
	acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
}

static u32 acpi_device_fixed_event(void *data)
{
	acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
	return ACPI_INTERRUPT_HANDLED;
}

static int acpi_device_install_notify_handler(struct acpi_device *device)
{
	acpi_status status;

	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						     acpi_device_fixed_event,
						     device);
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
						     acpi_device_fixed_event,
						     device);
	else
		status = acpi_install_notify_handler(device->handle,
						     ACPI_DEVICE_NOTIFY,
						     acpi_device_notify,
						     device);

	if (ACPI_FAILURE(status))
		return -EINVAL;
	return 0;
}

static void acpi_device_remove_notify_handler(struct acpi_device *device)
{
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
		acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						acpi_device_fixed_event);
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
		acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
						acpi_device_fixed_event);
	else
		acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
					   acpi_device_notify);
}

/* Handle events targeting \_SB device (at present only graceful shutdown) */

#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
#define ACPI_SB_INDICATE_INTERVAL	10000

static void sb_notify_work(struct work_struct *dummy)
{
	acpi_handle sb_handle;

	orderly_poweroff(true);

	/*
	 * After initiating graceful shutdown, the ACPI spec requires OSPM
	 * to evaluate _OST method once every 10seconds to indicate that
	 * the shutdown is in progress
	 */
	acpi_get_handle(NULL, "\\_SB", &sb_handle);
	while (1) {
		pr_info("Graceful shutdown in progress.\n");
		acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
				ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
		msleep(ACPI_SB_INDICATE_INTERVAL);
	}
}

static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
{
	static DECLARE_WORK(acpi_sb_work, sb_notify_work);

	if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
		if (!work_busy(&acpi_sb_work))
			schedule_work(&acpi_sb_work);
	} else
		pr_warn("event %x is not supported by \\_SB device\n", event);
}

static int __init acpi_setup_sb_notify_handler(void)
{
	acpi_handle sb_handle;

	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
		return -ENXIO;

	if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
						acpi_sb_notify, NULL)))
		return -EINVAL;

	return 0;
}

/* --------------------------------------------------------------------------
                             Device Matching
   -------------------------------------------------------------------------- */

/**
 * acpi_get_first_physical_node - Get first physical node of an ACPI device
 * @adev:	ACPI device in question
 *
 * Return: First physical node of ACPI device @adev
 */
struct device *acpi_get_first_physical_node(struct acpi_device *adev)
{
	struct mutex *physical_node_lock = &adev->physical_node_lock;
	struct device *phys_dev;

	mutex_lock(physical_node_lock);
	if (list_empty(&adev->physical_node_list)) {
		phys_dev = NULL;
	} else {
		const struct acpi_device_physical_node *node;

		node = list_first_entry(&adev->physical_node_list,
					struct acpi_device_physical_node, node);

		phys_dev = node->dev;
	}
	mutex_unlock(physical_node_lock);
	return phys_dev;
}

static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
						      const struct device *dev)
{
	const struct device *phys_dev = acpi_get_first_physical_node(adev);

	return phys_dev && phys_dev == dev ? adev : NULL;
}

/**
 * acpi_device_is_first_physical_node - Is given dev first physical node
 * @adev: ACPI companion device
 * @dev: Physical device to check
 *
 * Function checks if given @dev is the first physical devices attached to
 * the ACPI companion device. This distinction is needed in some cases
 * where the same companion device is shared between many physical devices.
 *
 * Note that the caller have to provide valid @adev pointer.
 */
bool acpi_device_is_first_physical_node(struct acpi_device *adev,
					const struct device *dev)
{
	return !!acpi_primary_dev_companion(adev, dev);
}

/*
 * acpi_companion_match() - Can we match via ACPI companion device
 * @dev: Device in question
 *
 * Check if the given device has an ACPI companion and if that companion has
 * a valid list of PNP IDs, and if the device is the first (primary) physical
 * device associated with it.  Return the companion pointer if that's the case
 * or NULL otherwise.
 *
 * If multiple physical devices are attached to a single ACPI companion, we need
 * to be careful.  The usage scenario for this kind of relationship is that all
 * of the physical devices in question use resources provided by the ACPI
 * companion.  A typical case is an MFD device where all the sub-devices share
 * the parent's ACPI companion.  In such cases we can only allow the primary
 * (first) physical device to be matched with the help of the companion's PNP
 * IDs.
 *
 * Additional physical devices sharing the ACPI companion can still use
 * resources available from it but they will be matched normally using functions
 * provided by their bus types (and analogously for their modalias).
 */
struct acpi_device *acpi_companion_match(const struct device *dev)
{
	struct acpi_device *adev;

	adev = ACPI_COMPANION(dev);
	if (!adev)
		return NULL;

	if (list_empty(&adev->pnp.ids))
		return NULL;

	return acpi_primary_dev_companion(adev, dev);
}

/**
 * acpi_of_match_device - Match device object using the "compatible" property.
 * @adev: ACPI device object to match.
 * @of_match_table: List of device IDs to match against.
 * @of_id: OF ID if matched
 *
 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 * identifiers and a _DSD object with the "compatible" property, use that
 * property to match against the given list of identifiers.
 */
static bool acpi_of_match_device(struct acpi_device *adev,
				 const struct of_device_id *of_match_table,
				 const struct of_device_id **of_id)
{
	const union acpi_object *of_compatible, *obj;
	int i, nval;

	if (!adev)
		return false;

	of_compatible = adev->data.of_compatible;
	if (!of_match_table || !of_compatible)
		return false;

	if (of_compatible->type == ACPI_TYPE_PACKAGE) {
		nval = of_compatible->package.count;
		obj = of_compatible->package.elements;
	} else { /* Must be ACPI_TYPE_STRING. */
		nval = 1;
		obj = of_compatible;
	}
	/* Now we can look for the driver DT compatible strings */
	for (i = 0; i < nval; i++, obj++) {
		const struct of_device_id *id;

		for (id = of_match_table; id->compatible[0]; id++)
			if (!strcasecmp(obj->string.pointer, id->compatible)) {
				if (of_id)
					*of_id = id;
				return true;
			}
	}

	return false;
}

static bool acpi_of_modalias(struct acpi_device *adev,
			     char *modalias, size_t len)
{
	const union acpi_object *of_compatible;
	const union acpi_object *obj;
	const char *str, *chr;

	of_compatible = adev->data.of_compatible;
	if (!of_compatible)
		return false;

	if (of_compatible->type == ACPI_TYPE_PACKAGE)
		obj = of_compatible->package.elements;
	else /* Must be ACPI_TYPE_STRING. */
		obj = of_compatible;

	str = obj->string.pointer;
	chr = strchr(str, ',');
	strlcpy(modalias, chr ? chr + 1 : str, len);

	return true;
}

/**
 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 * @adev:	ACPI device object to match
 * @default_id:	ID string to use as default if no compatible string found
 * @modalias:   Pointer to buffer that modalias value will be copied into
 * @len:	Length of modalias buffer
 *
 * This is a counterpart of of_modalias_node() for struct acpi_device objects.
 * If there is a compatible string for @adev, it will be copied to @modalias
 * with the vendor prefix stripped; otherwise, @default_id will be used.
 */
void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
		       char *modalias, size_t len)
{
	if (!acpi_of_modalias(adev, modalias, len))
		strlcpy(modalias, default_id, len);
}
EXPORT_SYMBOL_GPL(acpi_set_modalias);

static bool __acpi_match_device_cls(const struct acpi_device_id *id,
				    struct acpi_hardware_id *hwid)
{
	int i, msk, byte_shift;
	char buf[3];

	if (!id->cls)
		return false;

	/* Apply class-code bitmask, before checking each class-code byte */
	for (i = 1; i <= 3; i++) {
		byte_shift = 8 * (3 - i);
		msk = (id->cls_msk >> byte_shift) & 0xFF;
		if (!msk)
			continue;

		sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
		if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
			return false;
	}
	return true;
}

static bool __acpi_match_device(struct acpi_device *device,
				const struct acpi_device_id *acpi_ids,
				const struct of_device_id *of_ids,
				const struct acpi_device_id **acpi_id,
				const struct of_device_id **of_id)
{
	const struct acpi_device_id *id;
	struct acpi_hardware_id *hwid;

	/*
	 * If the device is not present, it is unnecessary to load device
	 * driver for it.
	 */
	if (!device || !device->status.present)
		return false;

	list_for_each_entry(hwid, &device->pnp.ids, list) {
		/* First, check the ACPI/PNP IDs provided by the caller. */
		if (acpi_ids) {
			for (id = acpi_ids; id->id[0] || id->cls; id++) {
				if (id->id[0] && !strcmp((char *)id->id, hwid->id))
					goto out_acpi_match;
				if (id->cls && __acpi_match_device_cls(id, hwid))
					goto out_acpi_match;
			}
		}

		/*
		 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
		 * "compatible" property if found.
		 */
		if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
			return acpi_of_match_device(device, of_ids, of_id);
	}
	return false;

out_acpi_match:
	if (acpi_id)
		*acpi_id = id;
	return true;
}

/**
 * acpi_match_device - Match a struct device against a given list of ACPI IDs
 * @ids: Array of struct acpi_device_id object to match against.
 * @dev: The device structure to match.
 *
 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 * object for that handle and use that object to match against a given list of
 * device IDs.
 *
 * Return a pointer to the first matching ID on success or %NULL on failure.
 */
const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
					       const struct device *dev)
{
	const struct acpi_device_id *id = NULL;

	__acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
	return id;
}
EXPORT_SYMBOL_GPL(acpi_match_device);

static const void *acpi_of_device_get_match_data(const struct device *dev)
{
	struct acpi_device *adev = ACPI_COMPANION(dev);
	const struct of_device_id *match = NULL;

	if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
		return NULL;

	return match->data;
}

const void *acpi_device_get_match_data(const struct device *dev)
{
	const struct acpi_device_id *match;

	if (!dev->driver->acpi_match_table)
		return acpi_of_device_get_match_data(dev);

	match = acpi_match_device(dev->driver->acpi_match_table, dev);
	if (!match)
		return NULL;

	return (const void *)match->driver_data;
}
EXPORT_SYMBOL_GPL(acpi_device_get_match_data);

int acpi_match_device_ids(struct acpi_device *device,
			  const struct acpi_device_id *ids)
{
	return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
}
EXPORT_SYMBOL(acpi_match_device_ids);

bool acpi_driver_match_device(struct device *dev,
			      const struct device_driver *drv)
{
	if (!drv->acpi_match_table)
		return acpi_of_match_device(ACPI_COMPANION(dev),
					    drv->of_match_table,
					    NULL);

	return __acpi_match_device(acpi_companion_match(dev),
				   drv->acpi_match_table, drv->of_match_table,
				   NULL, NULL);
}
EXPORT_SYMBOL_GPL(acpi_driver_match_device);

/* --------------------------------------------------------------------------
                              ACPI Driver Management
   -------------------------------------------------------------------------- */

/**
 * acpi_bus_register_driver - register a driver with the ACPI bus
 * @driver: driver being registered
 *
 * Registers a driver with the ACPI bus.  Searches the namespace for all
 * devices that match the driver's criteria and binds.  Returns zero for
 * success or a negative error status for failure.
 */
int acpi_bus_register_driver(struct acpi_driver *driver)
{
	int ret;

	if (acpi_disabled)
		return -ENODEV;
	driver->drv.name = driver->name;
	driver->drv.bus = &acpi_bus_type;
	driver->drv.owner = driver->owner;

	ret = driver_register(&driver->drv);
	return ret;
}

EXPORT_SYMBOL(acpi_bus_register_driver);

/**
 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 * @driver: driver to unregister
 *
 * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 * devices that match the driver's criteria and unbinds.
 */
void acpi_bus_unregister_driver(struct acpi_driver *driver)
{
	driver_unregister(&driver->drv);
}

EXPORT_SYMBOL(acpi_bus_unregister_driver);

/* --------------------------------------------------------------------------
                              ACPI Bus operations
   -------------------------------------------------------------------------- */

static int acpi_bus_match(struct device *dev, struct device_driver *drv)
{
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(drv);

	return acpi_dev->flags.match_driver
		&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
}

static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
}

static int acpi_device_probe(struct device *dev)
{
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
	int ret;

	if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
		return -EINVAL;

	if (!acpi_drv->ops.add)
		return -ENOSYS;

	ret = acpi_drv->ops.add(acpi_dev);
	if (ret)
		return ret;

	acpi_dev->driver = acpi_drv;
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Driver [%s] successfully bound to device [%s]\n",
			  acpi_drv->name, acpi_dev->pnp.bus_id));

	if (acpi_drv->ops.notify) {
		ret = acpi_device_install_notify_handler(acpi_dev);
		if (ret) {
			if (acpi_drv->ops.remove)
				acpi_drv->ops.remove(acpi_dev);

			acpi_dev->driver = NULL;
			acpi_dev->driver_data = NULL;
			return ret;
		}
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
			  acpi_drv->name, acpi_dev->pnp.bus_id));
	get_device(dev);
	return 0;
}

static int acpi_device_remove(struct device *dev)
{
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = acpi_dev->driver;

	if (acpi_drv) {
		if (acpi_drv->ops.notify)
			acpi_device_remove_notify_handler(acpi_dev);
		if (acpi_drv->ops.remove)
			acpi_drv->ops.remove(acpi_dev);
	}
	acpi_dev->driver = NULL;
	acpi_dev->driver_data = NULL;

	put_device(dev);
	return 0;
}

struct bus_type acpi_bus_type = {
	.name		= "acpi",
	.match		= acpi_bus_match,
	.probe		= acpi_device_probe,
	.remove		= acpi_device_remove,
	.uevent		= acpi_device_uevent,
};

/* --------------------------------------------------------------------------
                             Initialization/Cleanup
   -------------------------------------------------------------------------- */

static int __init acpi_bus_init_irq(void)
{
	acpi_status status;
	char *message = NULL;


	/*
	 * Let the system know what interrupt model we are using by
	 * evaluating the \_PIC object, if exists.
	 */

	switch (acpi_irq_model) {
	case ACPI_IRQ_MODEL_PIC:
		message = "PIC";
		break;
	case ACPI_IRQ_MODEL_IOAPIC:
		message = "IOAPIC";
		break;
	case ACPI_IRQ_MODEL_IOSAPIC:
		message = "IOSAPIC";
		break;
	case ACPI_IRQ_MODEL_GIC:
		message = "GIC";
		break;
	case ACPI_IRQ_MODEL_PLATFORM:
		message = "platform specific model";
		break;
	default:
		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
		return -ENODEV;
	}

	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);

	status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
		return -ENODEV;
	}

	return 0;
}

/**
 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
 *
 * The ACPI tables are accessible after this, but the handling of events has not
 * been initialized and the global lock is not available yet, so AML should not
 * be executed at this point.
 *
 * Doing this before switching the EFI runtime services to virtual mode allows
 * the EfiBootServices memory to be freed slightly earlier on boot.
 */
void __init acpi_early_init(void)
{
	acpi_status status;

	if (acpi_disabled)
		return;

	printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);

	/* enable workarounds, unless strict ACPI spec. compliance */
	if (!acpi_strict)
		acpi_gbl_enable_interpreter_slack = TRUE;

	acpi_permanent_mmap = true;

#ifdef CONFIG_X86
	/*
	 * If the machine falls into the DMI check table,
	 * DSDT will be copied to memory.
	 * Note that calling dmi_check_system() here on other architectures
	 * would not be OK because only x86 initializes dmi early enough.
	 * Thankfully only x86 systems need such quirks for now.
	 */
	dmi_check_system(dsdt_dmi_table);
#endif

	status = acpi_reallocate_root_table();
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX
		       "Unable to reallocate ACPI tables\n");
		goto error0;
	}

	status = acpi_initialize_subsystem();
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX
		       "Unable to initialize the ACPI Interpreter\n");
		goto error0;
	}

#ifdef CONFIG_X86
	if (!acpi_ioapic) {
		/* compatible (0) means level (3) */
		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
		}
		/* Set PIC-mode SCI trigger type */
		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
	} else {
		/*
		 * now that acpi_gbl_FADT is initialized,
		 * update it with result from INT_SRC_OVR parsing
		 */
		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
	}
#endif
	return;

 error0:
	disable_acpi();
}

/**
 * acpi_subsystem_init - Finalize the early initialization of ACPI.
 *
 * Switch over the platform to the ACPI mode (if possible).
 *
 * Doing this too early is generally unsafe, but at the same time it needs to be
 * done before all things that really depend on ACPI.  The right spot appears to
 * be before finalizing the EFI initialization.
 */
void __init acpi_subsystem_init(void)
{
	acpi_status status;

	if (acpi_disabled)
		return;

	status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
		disable_acpi();
	} else {
		/*
		 * If the system is using ACPI then we can be reasonably
		 * confident that any regulators are managed by the firmware
		 * so tell the regulator core it has everything it needs to
		 * know.
		 */
		regulator_has_full_constraints();
	}
}

static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
{
	acpi_scan_table_handler(event, table, context);

	return acpi_sysfs_table_handler(event, table, context);
}

static int __init acpi_bus_init(void)
{
	int result;
	acpi_status status;

	acpi_os_initialize1();

	status = acpi_load_tables();
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX
		       "Unable to load the System Description Tables\n");
		goto error1;
	}

	/*
	 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
	 * device is found in the namespace.
	 *
	 * This is accomplished by looking for the ECDT table and getting the EC
	 * parameters out of that.
	 *
	 * Do that before calling acpi_initialize_objects() which may trigger EC
	 * address space accesses.
	 */
	acpi_ec_ecdt_probe();

	status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX
		       "Unable to start the ACPI Interpreter\n");
		goto error1;
	}

	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
		goto error1;
	}

	/* Set capability bits for _OSC under processor scope */
	acpi_early_processor_osc();

	/*
	 * _OSC method may exist in module level code,
	 * so it must be run after ACPI_FULL_INITIALIZATION
	 */
	acpi_bus_osc_support();

	/*
	 * _PDC control method may load dynamic SSDT tables,
	 * and we need to install the table handler before that.
	 */
	status = acpi_install_table_handler(acpi_bus_table_handler, NULL);

	acpi_sysfs_init();

	acpi_early_processor_set_pdc();

	/*
	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
	 * is necessary to enable it as early as possible.
	 */
	acpi_ec_dsdt_probe();

	printk(KERN_INFO PREFIX "Interpreter enabled\n");

	/* Initialize sleep structures */
	acpi_sleep_init();

	/*
	 * Get the system interrupt model and evaluate \_PIC.
	 */
	result = acpi_bus_init_irq();
	if (result)
		goto error1;

	/*
	 * Register the for all standard device notifications.
	 */
	status =
	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
					&acpi_bus_notify, NULL);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX
		       "Unable to register for device notifications\n");
		goto error1;
	}

	/*
	 * Create the top ACPI proc directory
	 */
	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);

	result = bus_register(&acpi_bus_type);
	if (!result)
		return 0;

	/* Mimic structured exception handling */
      error1:
	acpi_terminate();
	return -ENODEV;
}

struct kobject *acpi_kobj;
EXPORT_SYMBOL_GPL(acpi_kobj);

static int __init acpi_init(void)
{
	int result;

	if (acpi_disabled) {
		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
		return -ENODEV;
	}

	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
	if (!acpi_kobj) {
		printk(KERN_WARNING "%s: kset create error\n", __func__);
		acpi_kobj = NULL;
	}

	result = acpi_bus_init();
	if (result) {
		disable_acpi();
		return result;
	}

	pci_mmcfg_late_init();
	acpi_iort_init();
	acpi_scan_init();
	acpi_ec_init();
	acpi_debugfs_init();
	acpi_sleep_proc_init();
	acpi_wakeup_device_init();
	acpi_debugger_init();
	acpi_setup_sb_notify_handler();
	return 0;
}

subsys_initcall(acpi_init);