summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/evregion.c
blob: 582b0af01e9955dc2c163463a1ab4648ac7d916f (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
/******************************************************************************
 *
 * Module Name: evregion - ACPI address_space (op_region) handler dispatch
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2008, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acevents.h"
#include "acnamesp.h"
#include "acinterp.h"

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evregion")

/* Local prototypes */
static u8
acpi_ev_has_default_handler(struct acpi_namespace_node *node,
			    acpi_adr_space_type space_id);

static acpi_status
acpi_ev_reg_run(acpi_handle obj_handle,
		u32 level, void *context, void **return_value);

static acpi_status
acpi_ev_install_handler(acpi_handle obj_handle,
			u32 level, void *context, void **return_value);

/* These are the address spaces that will get default handlers */

#define ACPI_NUM_DEFAULT_SPACES     4

static u8 acpi_gbl_default_address_spaces[ACPI_NUM_DEFAULT_SPACES] = {
	ACPI_ADR_SPACE_SYSTEM_MEMORY,
	ACPI_ADR_SPACE_SYSTEM_IO,
	ACPI_ADR_SPACE_PCI_CONFIG,
	ACPI_ADR_SPACE_DATA_TABLE
};

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_install_region_handlers
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Installs the core subsystem default address space handlers.
 *
 ******************************************************************************/

acpi_status acpi_ev_install_region_handlers(void)
{
	acpi_status status;
	u32 i;

	ACPI_FUNCTION_TRACE(ev_install_region_handlers);

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * All address spaces (PCI Config, EC, SMBus) are scope dependent and
	 * registration must occur for a specific device.
	 *
	 * In the case of the system memory and IO address spaces there is
	 * currently no device associated with the address space. For these we
	 * use the root.
	 *
	 * We install the default PCI config space handler at the root so that
	 * this space is immediately available even though the we have not
	 * enumerated all the PCI Root Buses yet. This is to conform to the ACPI
	 * specification which states that the PCI config space must be always
	 * available -- even though we are nowhere near ready to find the PCI root
	 * buses at this point.
	 *
	 * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler
	 * has already been installed (via acpi_install_address_space_handler).
	 * Similar for AE_SAME_HANDLER.
	 */
	for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
		status = acpi_ev_install_space_handler(acpi_gbl_root_node,
						       acpi_gbl_default_address_spaces
						       [i],
						       ACPI_DEFAULT_HANDLER,
						       NULL, NULL);
		switch (status) {
		case AE_OK:
		case AE_SAME_HANDLER:
		case AE_ALREADY_EXISTS:

			/* These exceptions are all OK */

			status = AE_OK;
			break;

		default:

			goto unlock_and_exit;
		}
	}

      unlock_and_exit:
	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_has_default_handler
 *
 * PARAMETERS:  Node                - Namespace node for the device
 *              space_id            - The address space ID
 *
 * RETURN:      TRUE if default handler is installed, FALSE otherwise
 *
 * DESCRIPTION: Check if the default handler is installed for the requested
 *              space ID.
 *
 ******************************************************************************/

static u8
acpi_ev_has_default_handler(struct acpi_namespace_node *node,
			    acpi_adr_space_type space_id)
{
	union acpi_operand_object *obj_desc;
	union acpi_operand_object *handler_obj;

	/* Must have an existing internal object */

	obj_desc = acpi_ns_get_attached_object(node);
	if (obj_desc) {
		handler_obj = obj_desc->device.handler;

		/* Walk the linked list of handlers for this object */

		while (handler_obj) {
			if (handler_obj->address_space.space_id == space_id) {
				if (handler_obj->address_space.handler_flags &
				    ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
					return (TRUE);
				}
			}

			handler_obj = handler_obj->address_space.next;
		}
	}

	return (FALSE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_initialize_op_regions
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute _REG methods for all Operation Regions that have
 *              an installed default region handler.
 *
 ******************************************************************************/

acpi_status acpi_ev_initialize_op_regions(void)
{
	acpi_status status;
	u32 i;

	ACPI_FUNCTION_TRACE(ev_initialize_op_regions);

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Run the _REG methods for op_regions in each default address space */

	for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
		/*
		 * Make sure the installed handler is the DEFAULT handler. If not the
		 * default, the _REG methods will have already been run (when the
		 * handler was installed)
		 */
		if (acpi_ev_has_default_handler(acpi_gbl_root_node,
						acpi_gbl_default_address_spaces
						[i])) {
			status =
			    acpi_ev_execute_reg_methods(acpi_gbl_root_node,
							acpi_gbl_default_address_spaces
							[i]);
		}
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_execute_reg_method
 *
 * PARAMETERS:  region_obj          - Region object
 *              Function            - Passed to _REG: On (1) or Off (0)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute _REG method for a region
 *
 ******************************************************************************/

acpi_status
acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
{
	struct acpi_evaluate_info *info;
	union acpi_operand_object *args[3];
	union acpi_operand_object *region_obj2;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_execute_reg_method);

	region_obj2 = acpi_ns_get_secondary_object(region_obj);
	if (!region_obj2) {
		return_ACPI_STATUS(AE_NOT_EXIST);
	}

	if (region_obj2->extra.method_REG == NULL) {
		return_ACPI_STATUS(AE_OK);
	}

	/* Allocate and initialize the evaluation information block */

	info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
	if (!info) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	info->prefix_node = region_obj2->extra.method_REG;
	info->pathname = NULL;
	info->parameters = args;
	info->flags = ACPI_IGNORE_RETURN_VALUE;

	/*
	 * The _REG method has two arguments:
	 *
	 * Arg0 - Integer:
	 *  Operation region space ID Same value as region_obj->Region.space_id
	 *
	 * Arg1 - Integer:
	 *  connection status 1 for connecting the handler, 0 for disconnecting
	 *  the handler (Passed as a parameter)
	 */
	args[0] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
	if (!args[0]) {
		status = AE_NO_MEMORY;
		goto cleanup1;
	}

	args[1] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
	if (!args[1]) {
		status = AE_NO_MEMORY;
		goto cleanup2;
	}

	/* Setup the parameter objects */

	args[0]->integer.value = region_obj->region.space_id;
	args[1]->integer.value = function;
	args[2] = NULL;

	/* Execute the method, no return value */

	ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
			(ACPI_TYPE_METHOD, info->prefix_node, NULL));

	status = acpi_ns_evaluate(info);
	acpi_ut_remove_reference(args[1]);

      cleanup2:
	acpi_ut_remove_reference(args[0]);

      cleanup1:
	ACPI_FREE(info);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_address_space_dispatch
 *
 * PARAMETERS:  region_obj          - Internal region object
 *              Function            - Read or Write operation
 *              region_offset       - Where in the region to read or write
 *              bit_width           - Field width in bits (8, 16, 32, or 64)
 *              Value               - Pointer to in or out value, must be
 *                                    full 64-bit acpi_integer
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Dispatch an address space or operation region access to
 *              a previously installed handler.
 *
 ******************************************************************************/

acpi_status
acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
			       u32 function,
			       u32 region_offset,
			       u32 bit_width, acpi_integer * value)
{
	acpi_status status;
	acpi_adr_space_handler handler;
	acpi_adr_space_setup region_setup;
	union acpi_operand_object *handler_desc;
	union acpi_operand_object *region_obj2;
	void *region_context = NULL;

	ACPI_FUNCTION_TRACE(ev_address_space_dispatch);

	region_obj2 = acpi_ns_get_secondary_object(region_obj);
	if (!region_obj2) {
		return_ACPI_STATUS(AE_NOT_EXIST);
	}

	/* Ensure that there is a handler associated with this region */

	handler_desc = region_obj->region.handler;
	if (!handler_desc) {
		ACPI_ERROR((AE_INFO,
			    "No handler for Region [%4.4s] (%p) [%s]",
			    acpi_ut_get_node_name(region_obj->region.node),
			    region_obj,
			    acpi_ut_get_region_name(region_obj->region.
						    space_id)));

		return_ACPI_STATUS(AE_NOT_EXIST);
	}

	/*
	 * It may be the case that the region has never been initialized.
	 * Some types of regions require special init code
	 */
	if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {

		/* This region has not been initialized yet, do it */

		region_setup = handler_desc->address_space.setup;
		if (!region_setup) {

			/* No initialization routine, exit with error */

			ACPI_ERROR((AE_INFO,
				    "No init routine for region(%p) [%s]",
				    region_obj,
				    acpi_ut_get_region_name(region_obj->region.
							    space_id)));
			return_ACPI_STATUS(AE_NOT_EXIST);
		}

		/*
		 * We must exit the interpreter because the region setup will
		 * potentially execute control methods (for example, the _REG method
		 * for this region)
		 */
		acpi_ex_exit_interpreter();

		status = region_setup(region_obj, ACPI_REGION_ACTIVATE,
				      handler_desc->address_space.context,
				      &region_context);

		/* Re-enter the interpreter */

		acpi_ex_enter_interpreter();

		/* Check for failure of the Region Setup */

		if (ACPI_FAILURE(status)) {
			ACPI_EXCEPTION((AE_INFO, status,
					"During region initialization: [%s]",
					acpi_ut_get_region_name(region_obj->
								region.
								space_id)));
			return_ACPI_STATUS(status);
		}

		/* Region initialization may have been completed by region_setup */

		if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
			region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;

			if (region_obj2->extra.region_context) {

				/* The handler for this region was already installed */

				ACPI_FREE(region_context);
			} else {
				/*
				 * Save the returned context for use in all accesses to
				 * this particular region
				 */
				region_obj2->extra.region_context =
				    region_context;
			}
		}
	}

	/* We have everything we need, we can invoke the address space handler */

	handler = handler_desc->address_space.handler;

	ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
			  "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
			  &region_obj->region.handler->address_space, handler,
			  ACPI_FORMAT_NATIVE_UINT(region_obj->region.address +
						  region_offset),
			  acpi_ut_get_region_name(region_obj->region.
						  space_id)));

	if (!(handler_desc->address_space.handler_flags &
	      ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
		/*
		 * For handlers other than the default (supplied) handlers, we must
		 * exit the interpreter because the handler *might* block -- we don't
		 * know what it will do, so we can't hold the lock on the intepreter.
		 */
		acpi_ex_exit_interpreter();
	}

	/* Call the handler */

	status = handler(function,
			 (region_obj->region.address + region_offset),
			 bit_width, value, handler_desc->address_space.context,
			 region_obj2->extra.region_context);

	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]",
				acpi_ut_get_region_name(region_obj->region.
							space_id)));
	}

	if (!(handler_desc->address_space.handler_flags &
	      ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
		/*
		 * We just returned from a non-default handler, we must re-enter the
		 * interpreter
		 */
		acpi_ex_enter_interpreter();
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_detach_region
 *
 * PARAMETERS:  region_obj          - Region Object
 *              acpi_ns_is_locked   - Namespace Region Already Locked?
 *
 * RETURN:      None
 *
 * DESCRIPTION: Break the association between the handler and the region
 *              this is a two way association.
 *
 ******************************************************************************/

void
acpi_ev_detach_region(union acpi_operand_object *region_obj,
		      u8 acpi_ns_is_locked)
{
	union acpi_operand_object *handler_obj;
	union acpi_operand_object *obj_desc;
	union acpi_operand_object **last_obj_ptr;
	acpi_adr_space_setup region_setup;
	void **region_context;
	union acpi_operand_object *region_obj2;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_detach_region);

	region_obj2 = acpi_ns_get_secondary_object(region_obj);
	if (!region_obj2) {
		return_VOID;
	}
	region_context = &region_obj2->extra.region_context;

	/* Get the address handler from the region object */

	handler_obj = region_obj->region.handler;
	if (!handler_obj) {

		/* This region has no handler, all done */

		return_VOID;
	}

	/* Find this region in the handler's list */

	obj_desc = handler_obj->address_space.region_list;
	last_obj_ptr = &handler_obj->address_space.region_list;

	while (obj_desc) {

		/* Is this the correct Region? */

		if (obj_desc == region_obj) {
			ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
					  "Removing Region %p from address handler %p\n",
					  region_obj, handler_obj));

			/* This is it, remove it from the handler's list */

			*last_obj_ptr = obj_desc->region.next;
			obj_desc->region.next = NULL;	/* Must clear field */

			if (acpi_ns_is_locked) {
				status =
				    acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
				if (ACPI_FAILURE(status)) {
					return_VOID;
				}
			}

			/* Now stop region accesses by executing the _REG method */

			status = acpi_ev_execute_reg_method(region_obj, 0);
			if (ACPI_FAILURE(status)) {
				ACPI_EXCEPTION((AE_INFO, status,
						"from region _REG, [%s]",
						acpi_ut_get_region_name
						(region_obj->region.space_id)));
			}

			if (acpi_ns_is_locked) {
				status =
				    acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
				if (ACPI_FAILURE(status)) {
					return_VOID;
				}
			}

			/*
			 * If the region has been activated, call the setup handler with
			 * the deactivate notification
			 */
			if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
				region_setup = handler_obj->address_space.setup;
				status =
				    region_setup(region_obj,
						 ACPI_REGION_DEACTIVATE,
						 handler_obj->address_space.
						 context, region_context);

				/* Init routine may fail, Just ignore errors */

				if (ACPI_FAILURE(status)) {
					ACPI_EXCEPTION((AE_INFO, status,
							"from region handler - deactivate, [%s]",
							acpi_ut_get_region_name
							(region_obj->region.
							 space_id)));
				}

				region_obj->region.flags &=
				    ~(AOPOBJ_SETUP_COMPLETE);
			}

			/*
			 * Remove handler reference in the region
			 *
			 * NOTE: this doesn't mean that the region goes away, the region
			 * is just inaccessible as indicated to the _REG method
			 *
			 * If the region is on the handler's list, this must be the
			 * region's handler
			 */
			region_obj->region.handler = NULL;
			acpi_ut_remove_reference(handler_obj);

			return_VOID;
		}

		/* Walk the linked list of handlers */

		last_obj_ptr = &obj_desc->region.next;
		obj_desc = obj_desc->region.next;
	}

	/* If we get here, the region was not in the handler's region list */

	ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
			  "Cannot remove region %p from address handler %p\n",
			  region_obj, handler_obj));

	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_attach_region
 *
 * PARAMETERS:  handler_obj         - Handler Object
 *              region_obj          - Region Object
 *              acpi_ns_is_locked   - Namespace Region Already Locked?
 *
 * RETURN:      None
 *
 * DESCRIPTION: Create the association between the handler and the region
 *              this is a two way association.
 *
 ******************************************************************************/

acpi_status
acpi_ev_attach_region(union acpi_operand_object *handler_obj,
		      union acpi_operand_object *region_obj,
		      u8 acpi_ns_is_locked)
{

	ACPI_FUNCTION_TRACE(ev_attach_region);

	ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
			  "Adding Region [%4.4s] %p to address handler %p [%s]\n",
			  acpi_ut_get_node_name(region_obj->region.node),
			  region_obj, handler_obj,
			  acpi_ut_get_region_name(region_obj->region.
						  space_id)));

	/* Link this region to the front of the handler's list */

	region_obj->region.next = handler_obj->address_space.region_list;
	handler_obj->address_space.region_list = region_obj;

	/* Install the region's handler */

	if (region_obj->region.handler) {
		return_ACPI_STATUS(AE_ALREADY_EXISTS);
	}

	region_obj->region.handler = handler_obj;
	acpi_ut_add_reference(handler_obj);

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_install_handler
 *
 * PARAMETERS:  walk_namespace callback
 *
 * DESCRIPTION: This routine installs an address handler into objects that are
 *              of type Region or Device.
 *
 *              If the Object is a Device, and the device has a handler of
 *              the same type then the search is terminated in that branch.
 *
 *              This is because the existing handler is closer in proximity
 *              to any more regions than the one we are trying to install.
 *
 ******************************************************************************/

static acpi_status
acpi_ev_install_handler(acpi_handle obj_handle,
			u32 level, void *context, void **return_value)
{
	union acpi_operand_object *handler_obj;
	union acpi_operand_object *next_handler_obj;
	union acpi_operand_object *obj_desc;
	struct acpi_namespace_node *node;
	acpi_status status;

	ACPI_FUNCTION_NAME(ev_install_handler);

	handler_obj = (union acpi_operand_object *)context;

	/* Parameter validation */

	if (!handler_obj) {
		return (AE_OK);
	}

	/* Convert and validate the device handle */

	node = acpi_ns_map_handle_to_node(obj_handle);
	if (!node) {
		return (AE_BAD_PARAMETER);
	}

	/*
	 * We only care about regions and objects that are allowed to have
	 * address space handlers
	 */
	if ((node->type != ACPI_TYPE_DEVICE) &&
	    (node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
		return (AE_OK);
	}

	/* Check for an existing internal object */

	obj_desc = acpi_ns_get_attached_object(node);
	if (!obj_desc) {

		/* No object, just exit */

		return (AE_OK);
	}

	/* Devices are handled different than regions */

	if (obj_desc->common.type == ACPI_TYPE_DEVICE) {

		/* Check if this Device already has a handler for this address space */

		next_handler_obj = obj_desc->device.handler;
		while (next_handler_obj) {

			/* Found a handler, is it for the same address space? */

			if (next_handler_obj->address_space.space_id ==
			    handler_obj->address_space.space_id) {
				ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
						  "Found handler for region [%s] in device %p(%p) "
						  "handler %p\n",
						  acpi_ut_get_region_name
						  (handler_obj->address_space.
						   space_id), obj_desc,
						  next_handler_obj,
						  handler_obj));

				/*
				 * Since the object we found it on was a device, then it
				 * means that someone has already installed a handler for
				 * the branch of the namespace from this device on. Just
				 * bail out telling the walk routine to not traverse this
				 * branch. This preserves the scoping rule for handlers.
				 */
				return (AE_CTRL_DEPTH);
			}

			/* Walk the linked list of handlers attached to this device */

			next_handler_obj = next_handler_obj->address_space.next;
		}

		/*
		 * As long as the device didn't have a handler for this space we
		 * don't care about it. We just ignore it and proceed.
		 */
		return (AE_OK);
	}

	/* Object is a Region */

	if (obj_desc->region.space_id != handler_obj->address_space.space_id) {

		/* This region is for a different address space, just ignore it */

		return (AE_OK);
	}

	/*
	 * Now we have a region and it is for the handler's address space type.
	 *
	 * First disconnect region for any previous handler (if any)
	 */
	acpi_ev_detach_region(obj_desc, FALSE);

	/* Connect the region to the new handler */

	status = acpi_ev_attach_region(handler_obj, obj_desc, FALSE);
	return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_install_space_handler
 *
 * PARAMETERS:  Node            - Namespace node for the device
 *              space_id        - The address space ID
 *              Handler         - Address of the handler
 *              Setup           - Address of the setup function
 *              Context         - Value passed to the handler on each access
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install a handler for all op_regions of a given space_id.
 *              Assumes namespace is locked
 *
 ******************************************************************************/

acpi_status
acpi_ev_install_space_handler(struct acpi_namespace_node * node,
			      acpi_adr_space_type space_id,
			      acpi_adr_space_handler handler,
			      acpi_adr_space_setup setup, void *context)
{
	union acpi_operand_object *obj_desc;
	union acpi_operand_object *handler_obj;
	acpi_status status;
	acpi_object_type type;
	u8 flags = 0;

	ACPI_FUNCTION_TRACE(ev_install_space_handler);

	/*
	 * This registration is valid for only the types below and the root. This
	 * is where the default handlers get placed.
	 */
	if ((node->type != ACPI_TYPE_DEVICE) &&
	    (node->type != ACPI_TYPE_PROCESSOR) &&
	    (node->type != ACPI_TYPE_THERMAL) && (node != acpi_gbl_root_node)) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	if (handler == ACPI_DEFAULT_HANDLER) {
		flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;

		switch (space_id) {
		case ACPI_ADR_SPACE_SYSTEM_MEMORY:
			handler = acpi_ex_system_memory_space_handler;
			setup = acpi_ev_system_memory_region_setup;
			break;

		case ACPI_ADR_SPACE_SYSTEM_IO:
			handler = acpi_ex_system_io_space_handler;
			setup = acpi_ev_io_space_region_setup;
			break;

		case ACPI_ADR_SPACE_PCI_CONFIG:
			handler = acpi_ex_pci_config_space_handler;
			setup = acpi_ev_pci_config_region_setup;
			break;

		case ACPI_ADR_SPACE_CMOS:
			handler = acpi_ex_cmos_space_handler;
			setup = acpi_ev_cmos_region_setup;
			break;

		case ACPI_ADR_SPACE_PCI_BAR_TARGET:
			handler = acpi_ex_pci_bar_space_handler;
			setup = acpi_ev_pci_bar_region_setup;
			break;

		case ACPI_ADR_SPACE_DATA_TABLE:
			handler = acpi_ex_data_table_space_handler;
			setup = NULL;
			break;

		default:
			status = AE_BAD_PARAMETER;
			goto unlock_and_exit;
		}
	}

	/* If the caller hasn't specified a setup routine, use the default */

	if (!setup) {
		setup = acpi_ev_default_region_setup;
	}

	/* Check for an existing internal object */

	obj_desc = acpi_ns_get_attached_object(node);
	if (obj_desc) {
		/*
		 * The attached device object already exists. Make sure the handler
		 * is not already installed.
		 */
		handler_obj = obj_desc->device.handler;

		/* Walk the handler list for this device */

		while (handler_obj) {

			/* Same space_id indicates a handler already installed */

			if (handler_obj->address_space.space_id == space_id) {
				if (handler_obj->address_space.handler ==
				    handler) {
					/*
					 * It is (relatively) OK to attempt to install the SAME
					 * handler twice. This can easily happen with the
					 * PCI_Config space.
					 */
					status = AE_SAME_HANDLER;
					goto unlock_and_exit;
				} else {
					/* A handler is already installed */

					status = AE_ALREADY_EXISTS;
				}
				goto unlock_and_exit;
			}

			/* Walk the linked list of handlers */

			handler_obj = handler_obj->address_space.next;
		}
	} else {
		ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
				  "Creating object on Device %p while installing handler\n",
				  node));

		/* obj_desc does not exist, create one */

		if (node->type == ACPI_TYPE_ANY) {
			type = ACPI_TYPE_DEVICE;
		} else {
			type = node->type;
		}

		obj_desc = acpi_ut_create_internal_object(type);
		if (!obj_desc) {
			status = AE_NO_MEMORY;
			goto unlock_and_exit;
		}

		/* Init new descriptor */

		obj_desc->common.type = (u8) type;

		/* Attach the new object to the Node */

		status = acpi_ns_attach_object(node, obj_desc, type);

		/* Remove local reference to the object */

		acpi_ut_remove_reference(obj_desc);

		if (ACPI_FAILURE(status)) {
			goto unlock_and_exit;
		}
	}

	ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
			  "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
			  acpi_ut_get_region_name(space_id), space_id,
			  acpi_ut_get_node_name(node), node, obj_desc));

	/*
	 * Install the handler
	 *
	 * At this point there is no existing handler. Just allocate the object
	 * for the handler and link it into the list.
	 */
	handler_obj =
	    acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
	if (!handler_obj) {
		status = AE_NO_MEMORY;
		goto unlock_and_exit;
	}

	/* Init handler obj */

	handler_obj->address_space.space_id = (u8) space_id;
	handler_obj->address_space.handler_flags = flags;
	handler_obj->address_space.region_list = NULL;
	handler_obj->address_space.node = node;
	handler_obj->address_space.handler = handler;
	handler_obj->address_space.context = context;
	handler_obj->address_space.setup = setup;

	/* Install at head of Device.address_space list */

	handler_obj->address_space.next = obj_desc->device.handler;

	/*
	 * The Device object is the first reference on the handler_obj.
	 * Each region that uses the handler adds a reference.
	 */
	obj_desc->device.handler = handler_obj;

	/*
	 * Walk the namespace finding all of the regions this
	 * handler will manage.
	 *
	 * Start at the device and search the branch toward
	 * the leaf nodes until either the leaf is encountered or
	 * a device is detected that has an address handler of the
	 * same type.
	 *
	 * In either case, back up and search down the remainder
	 * of the branch
	 */
	status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
					ACPI_NS_WALK_UNLOCK,
					acpi_ev_install_handler, NULL,
					handler_obj, NULL);

      unlock_and_exit:
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_execute_reg_methods
 *
 * PARAMETERS:  Node            - Namespace node for the device
 *              space_id        - The address space ID
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Run all _REG methods for the input Space ID;
 *              Note: assumes namespace is locked, or system init time.
 *
 ******************************************************************************/

acpi_status
acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
			    acpi_adr_space_type space_id)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_execute_reg_methods);

	/*
	 * Run all _REG methods for all Operation Regions for this space ID. This
	 * is a separate walk in order to handle any interdependencies between
	 * regions and _REG methods. (i.e. handlers must be installed for all
	 * regions of this Space ID before we can run any _REG methods)
	 */
	status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
					ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
					NULL, &space_id, NULL);

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_reg_run
 *
 * PARAMETERS:  walk_namespace callback
 *
 * DESCRIPTION: Run _REG method for region objects of the requested space_iD
 *
 ******************************************************************************/

static acpi_status
acpi_ev_reg_run(acpi_handle obj_handle,
		u32 level, void *context, void **return_value)
{
	union acpi_operand_object *obj_desc;
	struct acpi_namespace_node *node;
	acpi_adr_space_type space_id;
	acpi_status status;

	space_id = *ACPI_CAST_PTR(acpi_adr_space_type, context);

	/* Convert and validate the device handle */

	node = acpi_ns_map_handle_to_node(obj_handle);
	if (!node) {
		return (AE_BAD_PARAMETER);
	}

	/*
	 * We only care about regions.and objects that are allowed to have address
	 * space handlers
	 */
	if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
		return (AE_OK);
	}

	/* Check for an existing internal object */

	obj_desc = acpi_ns_get_attached_object(node);
	if (!obj_desc) {

		/* No object, just exit */

		return (AE_OK);
	}

	/* Object is a Region */

	if (obj_desc->region.space_id != space_id) {

		/* This region is for a different address space, just ignore it */

		return (AE_OK);
	}

	status = acpi_ev_execute_reg_method(obj_desc, 1);
	return (status);
}
OpenPOWER on IntegriCloud