summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/utdelete.c
blob: 31f5a7832ef135e94659179fbec6a927098b5fa3 (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
/*******************************************************************************
 *
 * Module Name: utdelete - object deletion and reference count utilities
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2011, 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 "acinterp.h"
#include "acnamesp.h"
#include "acevents.h"

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utdelete")

/* Local prototypes */
static void acpi_ut_delete_internal_obj(union acpi_operand_object *object);

static void
acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_delete_internal_obj
 *
 * PARAMETERS:  Object         - Object to be deleted
 *
 * RETURN:      None
 *
 * DESCRIPTION: Low level object deletion, after reference counts have been
 *              updated (All reference counts, including sub-objects!)
 *
 ******************************************************************************/

static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
{
	void *obj_pointer = NULL;
	union acpi_operand_object *handler_desc;
	union acpi_operand_object *second_desc;
	union acpi_operand_object *next_desc;
	union acpi_operand_object **last_obj_ptr;

	ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object);

	if (!object) {
		return_VOID;
	}

	/*
	 * Must delete or free any pointers within the object that are not
	 * actual ACPI objects (for example, a raw buffer pointer).
	 */
	switch (object->common.type) {
	case ACPI_TYPE_STRING:

		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  "**** String %p, ptr %p\n", object,
				  object->string.pointer));

		/* Free the actual string buffer */

		if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {

			/* But only if it is NOT a pointer into an ACPI table */

			obj_pointer = object->string.pointer;
		}
		break;

	case ACPI_TYPE_BUFFER:

		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  "**** Buffer %p, ptr %p\n", object,
				  object->buffer.pointer));

		/* Free the actual buffer */

		if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {

			/* But only if it is NOT a pointer into an ACPI table */

			obj_pointer = object->buffer.pointer;
		}
		break;

	case ACPI_TYPE_PACKAGE:

		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  " **** Package of count %X\n",
				  object->package.count));

		/*
		 * Elements of the package are not handled here, they are deleted
		 * separately
		 */

		/* Free the (variable length) element pointer array */

		obj_pointer = object->package.elements;
		break;

		/*
		 * These objects have a possible list of notify handlers.
		 * Device object also may have a GPE block.
		 */
	case ACPI_TYPE_DEVICE:

		if (object->device.gpe_block) {
			(void)acpi_ev_delete_gpe_block(object->device.
						       gpe_block);
		}

		/*lint -fallthrough */

	case ACPI_TYPE_PROCESSOR:
	case ACPI_TYPE_THERMAL:

		/* Walk the notify handler list for this object */

		handler_desc = object->common_notify.handler;
		while (handler_desc) {
			next_desc = handler_desc->address_space.next;
			acpi_ut_remove_reference(handler_desc);
			handler_desc = next_desc;
		}
		break;

	case ACPI_TYPE_MUTEX:

		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  "***** Mutex %p, OS Mutex %p\n",
				  object, object->mutex.os_mutex));

		if (object == acpi_gbl_global_lock_mutex) {

			/* Global Lock has extra semaphore */

			(void)
			    acpi_os_delete_semaphore
			    (acpi_gbl_global_lock_semaphore);
			acpi_gbl_global_lock_semaphore = NULL;

			acpi_os_delete_mutex(object->mutex.os_mutex);
			acpi_gbl_global_lock_mutex = NULL;
		} else {
			acpi_ex_unlink_mutex(object);
			acpi_os_delete_mutex(object->mutex.os_mutex);
		}
		break;

	case ACPI_TYPE_EVENT:

		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  "***** Event %p, OS Semaphore %p\n",
				  object, object->event.os_semaphore));

		(void)acpi_os_delete_semaphore(object->event.os_semaphore);
		object->event.os_semaphore = NULL;
		break;

	case ACPI_TYPE_METHOD:

		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  "***** Method %p\n", object));

		/* Delete the method mutex if it exists */

		if (object->method.mutex) {
			acpi_os_delete_mutex(object->method.mutex->mutex.
					     os_mutex);
			acpi_ut_delete_object_desc(object->method.mutex);
			object->method.mutex = NULL;
		}
		break;

	case ACPI_TYPE_REGION:

		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  "***** Region %p\n", object));

		/* Invalidate the region address/length via the host OS */

		acpi_os_invalidate_address(object->region.space_id,
					  object->region.address,
					  (acpi_size) object->region.length);

		second_desc = acpi_ns_get_secondary_object(object);
		if (second_desc) {
			/*
			 * Free the region_context if and only if the handler is one of the
			 * default handlers -- and therefore, we created the context object
			 * locally, it was not created by an external caller.
			 */
			handler_desc = object->region.handler;
			if (handler_desc) {
				next_desc =
				    handler_desc->address_space.region_list;
				last_obj_ptr =
				    &handler_desc->address_space.region_list;

				/* Remove the region object from the handler's list */

				while (next_desc) {
					if (next_desc == object) {
						*last_obj_ptr =
						    next_desc->region.next;
						break;
					}

					/* Walk the linked list of handler */

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

				if (handler_desc->address_space.handler_flags &
				    ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {

					/* Deactivate region and free region context */

					if (handler_desc->address_space.setup) {
						(void)handler_desc->
						    address_space.setup(object,
									ACPI_REGION_DEACTIVATE,
									handler_desc->
									address_space.
									context,
									&second_desc->
									extra.
									region_context);
					}
				}

				acpi_ut_remove_reference(handler_desc);
			}

			/* Now we can free the Extra object */

			acpi_ut_delete_object_desc(second_desc);
		}
		break;

	case ACPI_TYPE_BUFFER_FIELD:

		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  "***** Buffer Field %p\n", object));

		second_desc = acpi_ns_get_secondary_object(object);
		if (second_desc) {
			acpi_ut_delete_object_desc(second_desc);
		}
		break;

	case ACPI_TYPE_LOCAL_BANK_FIELD:

		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  "***** Bank Field %p\n", object));

		second_desc = acpi_ns_get_secondary_object(object);
		if (second_desc) {
			acpi_ut_delete_object_desc(second_desc);
		}
		break;

	default:
		break;
	}

	/* Free any allocated memory (pointer within the object) found above */

	if (obj_pointer) {
		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  "Deleting Object Subptr %p\n", obj_pointer));
		ACPI_FREE(obj_pointer);
	}

	/* Now the object can be safely deleted */

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
			  object, acpi_ut_get_object_type_name(object)));

	acpi_ut_delete_object_desc(object);
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_delete_internal_object_list
 *
 * PARAMETERS:  obj_list        - Pointer to the list to be deleted
 *
 * RETURN:      None
 *
 * DESCRIPTION: This function deletes an internal object list, including both
 *              simple objects and package objects
 *
 ******************************************************************************/

void acpi_ut_delete_internal_object_list(union acpi_operand_object **obj_list)
{
	union acpi_operand_object **internal_obj;

	ACPI_FUNCTION_TRACE(ut_delete_internal_object_list);

	/* Walk the null-terminated internal list */

	for (internal_obj = obj_list; *internal_obj; internal_obj++) {
		acpi_ut_remove_reference(*internal_obj);
	}

	/* Free the combined parameter pointer list and object array */

	ACPI_FREE(obj_list);
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_update_ref_count
 *
 * PARAMETERS:  Object          - Object whose ref count is to be updated
 *              Action          - What to do
 *
 * RETURN:      New ref count
 *
 * DESCRIPTION: Modify the ref count and return it.
 *
 ******************************************************************************/

static void
acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action)
{
	u16 count;
	u16 new_count;

	ACPI_FUNCTION_NAME(ut_update_ref_count);

	if (!object) {
		return;
	}

	count = object->common.reference_count;
	new_count = count;

	/*
	 * Perform the reference count action (increment, decrement, force delete)
	 */
	switch (action) {
	case REF_INCREMENT:

		new_count++;
		object->common.reference_count = new_count;

		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  "Obj %p Refs=%X, [Incremented]\n",
				  object, new_count));
		break;

	case REF_DECREMENT:

		if (count < 1) {
			ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
					  "Obj %p Refs=%X, can't decrement! (Set to 0)\n",
					  object, new_count));

			new_count = 0;
		} else {
			new_count--;

			ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
					  "Obj %p Refs=%X, [Decremented]\n",
					  object, new_count));
		}

		if (object->common.type == ACPI_TYPE_METHOD) {
			ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
					  "Method Obj %p Refs=%X, [Decremented]\n",
					  object, new_count));
		}

		object->common.reference_count = new_count;
		if (new_count == 0) {
			acpi_ut_delete_internal_obj(object);
		}
		break;

	case REF_FORCE_DELETE:

		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
				  "Obj %p Refs=%X, Force delete! (Set to 0)\n",
				  object, count));

		new_count = 0;
		object->common.reference_count = new_count;
		acpi_ut_delete_internal_obj(object);
		break;

	default:

		ACPI_ERROR((AE_INFO, "Unknown action (0x%X)", action));
		break;
	}

	/*
	 * Sanity check the reference count, for debug purposes only.
	 * (A deleted object will have a huge reference count)
	 */
	if (count > ACPI_MAX_REFERENCE_COUNT) {
		ACPI_WARNING((AE_INFO,
			      "Large Reference Count (0x%X) in object %p",
			      count, object));
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_update_object_reference
 *
 * PARAMETERS:  Object              - Increment ref count for this object
 *                                    and all sub-objects
 *              Action              - Either REF_INCREMENT or REF_DECREMENT or
 *                                    REF_FORCE_DELETE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Increment the object reference count
 *
 * Object references are incremented when:
 * 1) An object is attached to a Node (namespace object)
 * 2) An object is copied (all subobjects must be incremented)
 *
 * Object references are decremented when:
 * 1) An object is detached from an Node
 *
 ******************************************************************************/

acpi_status
acpi_ut_update_object_reference(union acpi_operand_object *object, u16 action)
{
	acpi_status status = AE_OK;
	union acpi_generic_state *state_list = NULL;
	union acpi_operand_object *next_object = NULL;
	union acpi_generic_state *state;
	u32 i;

	ACPI_FUNCTION_TRACE_PTR(ut_update_object_reference, object);

	while (object) {

		/* Make sure that this isn't a namespace handle */

		if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) {
			ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
					  "Object %p is NS handle\n", object));
			return_ACPI_STATUS(AE_OK);
		}

		/*
		 * All sub-objects must have their reference count incremented also.
		 * Different object types have different subobjects.
		 */
		switch (object->common.type) {
		case ACPI_TYPE_DEVICE:
		case ACPI_TYPE_PROCESSOR:
		case ACPI_TYPE_POWER:
		case ACPI_TYPE_THERMAL:

			/* Update the notify objects for these types (if present) */

			acpi_ut_update_ref_count(object->common_notify.
						 system_notify, action);
			acpi_ut_update_ref_count(object->common_notify.
						 device_notify, action);
			break;

		case ACPI_TYPE_PACKAGE:
			/*
			 * We must update all the sub-objects of the package,
			 * each of whom may have their own sub-objects.
			 */
			for (i = 0; i < object->package.count; i++) {
				/*
				 * Push each element onto the stack for later processing.
				 * Note: There can be null elements within the package,
				 * these are simply ignored
				 */
				status =
				    acpi_ut_create_update_state_and_push
				    (object->package.elements[i], action,
				     &state_list);
				if (ACPI_FAILURE(status)) {
					goto error_exit;
				}
			}
			break;

		case ACPI_TYPE_BUFFER_FIELD:

			next_object = object->buffer_field.buffer_obj;
			break;

		case ACPI_TYPE_LOCAL_REGION_FIELD:

			next_object = object->field.region_obj;
			break;

		case ACPI_TYPE_LOCAL_BANK_FIELD:

			next_object = object->bank_field.bank_obj;
			status =
			    acpi_ut_create_update_state_and_push(object->
								 bank_field.
								 region_obj,
								 action,
								 &state_list);
			if (ACPI_FAILURE(status)) {
				goto error_exit;
			}
			break;

		case ACPI_TYPE_LOCAL_INDEX_FIELD:

			next_object = object->index_field.index_obj;
			status =
			    acpi_ut_create_update_state_and_push(object->
								 index_field.
								 data_obj,
								 action,
								 &state_list);
			if (ACPI_FAILURE(status)) {
				goto error_exit;
			}
			break;

		case ACPI_TYPE_LOCAL_REFERENCE:
			/*
			 * The target of an Index (a package, string, or buffer) or a named
			 * reference must track changes to the ref count of the index or
			 * target object.
			 */
			if ((object->reference.class == ACPI_REFCLASS_INDEX) ||
			    (object->reference.class == ACPI_REFCLASS_NAME)) {
				next_object = object->reference.object;
			}
			break;

		case ACPI_TYPE_REGION:
		default:
			break;	/* No subobjects for all other types */
		}

		/*
		 * Now we can update the count in the main object. This can only
		 * happen after we update the sub-objects in case this causes the
		 * main object to be deleted.
		 */
		acpi_ut_update_ref_count(object, action);
		object = NULL;

		/* Move on to the next object to be updated */

		if (next_object) {
			object = next_object;
			next_object = NULL;
		} else if (state_list) {
			state = acpi_ut_pop_generic_state(&state_list);
			object = state->update.object;
			acpi_ut_delete_generic_state(state);
		}
	}

	return_ACPI_STATUS(AE_OK);

      error_exit:

	ACPI_EXCEPTION((AE_INFO, status,
			"Could not update object reference count"));

	/* Free any stacked Update State objects */

	while (state_list) {
		state = acpi_ut_pop_generic_state(&state_list);
		acpi_ut_delete_generic_state(state);
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_add_reference
 *
 * PARAMETERS:  Object          - Object whose reference count is to be
 *                                incremented
 *
 * RETURN:      None
 *
 * DESCRIPTION: Add one reference to an ACPI object
 *
 ******************************************************************************/

void acpi_ut_add_reference(union acpi_operand_object *object)
{

	ACPI_FUNCTION_TRACE_PTR(ut_add_reference, object);

	/* Ensure that we have a valid object */

	if (!acpi_ut_valid_internal_object(object)) {
		return_VOID;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
			  "Obj %p Current Refs=%X [To Be Incremented]\n",
			  object, object->common.reference_count));

	/* Increment the reference count */

	(void)acpi_ut_update_object_reference(object, REF_INCREMENT);
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_remove_reference
 *
 * PARAMETERS:  Object         - Object whose ref count will be decremented
 *
 * RETURN:      None
 *
 * DESCRIPTION: Decrement the reference count of an ACPI internal object
 *
 ******************************************************************************/

void acpi_ut_remove_reference(union acpi_operand_object *object)
{

	ACPI_FUNCTION_TRACE_PTR(ut_remove_reference, object);

	/*
	 * Allow a NULL pointer to be passed in, just ignore it. This saves
	 * each caller from having to check. Also, ignore NS nodes.
	 *
	 */
	if (!object ||
	    (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED)) {
		return_VOID;
	}

	/* Ensure that we have a valid object */

	if (!acpi_ut_valid_internal_object(object)) {
		return_VOID;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
			  "Obj %p Current Refs=%X [To Be Decremented]\n",
			  object, object->common.reference_count));

	/*
	 * Decrement the reference count, and only actually delete the object
	 * if the reference count becomes 0. (Must also decrement the ref count
	 * of all subobjects!)
	 */
	(void)acpi_ut_update_object_reference(object, REF_DECREMENT);
	return_VOID;
}