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Linux 2.6.19-rc1
[linux-2.6/next.git] / drivers / acpi / utilities / utdelete.c
blob9d3f1149ba217736e5ff8b376445e522f6f8a79f
1 /*******************************************************************************
2 *
3 * Module Name: utdelete - object deletion and reference count utilities
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2006, R. Byron Moore
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include <acpi/acpi.h>
45 #include <acpi/acinterp.h>
46 #include <acpi/acnamesp.h>
47 #include <acpi/acevents.h>
48 #include <acpi/amlcode.h>
49
50 #define _COMPONENT ACPI_UTILITIES
51 ACPI_MODULE_NAME("utdelete")
52
53 /* Local prototypes */
54 static void acpi_ut_delete_internal_obj(union acpi_operand_object *object);
55
56 static void
57 acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action);
58
59 /*******************************************************************************
60 *
61 * FUNCTION: acpi_ut_delete_internal_obj
62 *
63 * PARAMETERS: Object - Object to be deleted
64 *
65 * RETURN: None
66 *
67 * DESCRIPTION: Low level object deletion, after reference counts have been
68 * updated (All reference counts, including sub-objects!)
69 *
70 ******************************************************************************/
71
72 static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
73 {
74 void *obj_pointer = NULL;
75 union acpi_operand_object *handler_desc;
76 union acpi_operand_object *second_desc;
77 union acpi_operand_object *next_desc;
78
79 ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object);
80
81 if (!object) {
82 return_VOID;
83 }
84
85 /*
86 * Must delete or free any pointers within the object that are not
87 * actual ACPI objects (for example, a raw buffer pointer).
88 */
89 switch (ACPI_GET_OBJECT_TYPE(object)) {
90 case ACPI_TYPE_STRING:
91
92 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
93 "**** String %p, ptr %p\n", object,
94 object->string.pointer));
95
96 /* Free the actual string buffer */
97
98 if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
99
100 /* But only if it is NOT a pointer into an ACPI table */
101
102 obj_pointer = object->string.pointer;
103 }
104 break;
105
106 case ACPI_TYPE_BUFFER:
107
108 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
109 "**** Buffer %p, ptr %p\n", object,
110 object->buffer.pointer));
111
112 /* Free the actual buffer */
113
114 if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
115
116 /* But only if it is NOT a pointer into an ACPI table */
117
118 obj_pointer = object->buffer.pointer;
119 }
120 break;
121
122 case ACPI_TYPE_PACKAGE:
123
124 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
125 " **** Package of count %X\n",
126 object->package.count));
127
128 /*
129 * Elements of the package are not handled here, they are deleted
130 * separately
131 */
132
133 /* Free the (variable length) element pointer array */
134
135 obj_pointer = object->package.elements;
136 break;
137
138 case ACPI_TYPE_DEVICE:
139
140 if (object->device.gpe_block) {
141 (void)acpi_ev_delete_gpe_block(object->device.
142 gpe_block);
143 }
144
145 /* Walk the handler list for this device */
146
147 handler_desc = object->device.handler;
148 while (handler_desc) {
149 next_desc = handler_desc->address_space.next;
150 acpi_ut_remove_reference(handler_desc);
151 handler_desc = next_desc;
152 }
153 break;
154
155 case ACPI_TYPE_MUTEX:
156
157 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
158 "***** Mutex %p, OS Mutex %p\n",
159 object, object->mutex.os_mutex));
160
161 if (object->mutex.os_mutex != ACPI_GLOBAL_LOCK) {
162 acpi_ex_unlink_mutex(object);
163 acpi_os_delete_mutex(object->mutex.os_mutex);
164 } else {
165 /* Global Lock "mutex" is actually a counting semaphore */
166
167 (void)
168 acpi_os_delete_semaphore
169 (acpi_gbl_global_lock_semaphore);
170 acpi_gbl_global_lock_semaphore = NULL;
171 }
172 break;
173
174 case ACPI_TYPE_EVENT:
175
176 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
177 "***** Event %p, OS Semaphore %p\n",
178 object, object->event.os_semaphore));
179
180 (void)acpi_os_delete_semaphore(object->event.os_semaphore);
181 object->event.os_semaphore = NULL;
182 break;
183
184 case ACPI_TYPE_METHOD:
185
186 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
187 "***** Method %p\n", object));
188
189 /* Delete the method mutex if it exists */
190
191 if (object->method.mutex) {
192 acpi_os_delete_mutex(object->method.mutex->mutex.
193 os_mutex);
194 acpi_ut_delete_object_desc(object->method.mutex);
195 object->method.mutex = NULL;
196 }
197 break;
198
199 case ACPI_TYPE_REGION:
200
201 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
202 "***** Region %p\n", object));
203
204 second_desc = acpi_ns_get_secondary_object(object);
205 if (second_desc) {
206 /*
207 * Free the region_context if and only if the handler is one of the
208 * default handlers -- and therefore, we created the context object
209 * locally, it was not created by an external caller.
210 */
211 handler_desc = object->region.handler;
212 if (handler_desc) {
213 if (handler_desc->address_space.handler_flags &
214 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
215
216 /* Deactivate region and free region context */
217
218 if (handler_desc->address_space.setup) {
219 (void)handler_desc->
220 address_space.setup(object,
221 ACPI_REGION_DEACTIVATE,
222 handler_desc->
223 address_space.
224 context,
225 &second_desc->
226 extra.
227 region_context);
228 }
229 }
230
231 acpi_ut_remove_reference(handler_desc);
232 }
233
234 /* Now we can free the Extra object */
235
236 acpi_ut_delete_object_desc(second_desc);
237 }
238 break;
239
240 case ACPI_TYPE_BUFFER_FIELD:
241
242 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
243 "***** Buffer Field %p\n", object));
244
245 second_desc = acpi_ns_get_secondary_object(object);
246 if (second_desc) {
247 acpi_ut_delete_object_desc(second_desc);
248 }
249 break;
250
251 default:
252 break;
253 }
254
255 /* Free any allocated memory (pointer within the object) found above */
256
257 if (obj_pointer) {
258 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
259 "Deleting Object Subptr %p\n", obj_pointer));
260 ACPI_FREE(obj_pointer);
261 }
262
263 /* Now the object can be safely deleted */
264
265 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
266 object, acpi_ut_get_object_type_name(object)));
267
268 acpi_ut_delete_object_desc(object);
269 return_VOID;
270 }
271
272 /*******************************************************************************
273 *
274 * FUNCTION: acpi_ut_delete_internal_object_list
275 *
276 * PARAMETERS: obj_list - Pointer to the list to be deleted
277 *
278 * RETURN: None
279 *
280 * DESCRIPTION: This function deletes an internal object list, including both
281 * simple objects and package objects
282 *
283 ******************************************************************************/
284
285 void acpi_ut_delete_internal_object_list(union acpi_operand_object **obj_list)
286 {
287 union acpi_operand_object **internal_obj;
288
289 ACPI_FUNCTION_TRACE(ut_delete_internal_object_list);
290
291 /* Walk the null-terminated internal list */
292
293 for (internal_obj = obj_list; *internal_obj; internal_obj++) {
294 acpi_ut_remove_reference(*internal_obj);
295 }
296
297 /* Free the combined parameter pointer list and object array */
298
299 ACPI_FREE(obj_list);
300 return_VOID;
301 }
302
303 /*******************************************************************************
304 *
305 * FUNCTION: acpi_ut_update_ref_count
306 *
307 * PARAMETERS: Object - Object whose ref count is to be updated
308 * Action - What to do
309 *
310 * RETURN: New ref count
311 *
312 * DESCRIPTION: Modify the ref count and return it.
313 *
314 ******************************************************************************/
315
316 static void
317 acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action)
318 {
319 u16 count;
320 u16 new_count;
321
322 ACPI_FUNCTION_NAME(ut_update_ref_count);
323
324 if (!object) {
325 return;
326 }
327
328 count = object->common.reference_count;
329 new_count = count;
330
331 /*
332 * Perform the reference count action (increment, decrement, force delete)
333 */
334 switch (action) {
335 case REF_INCREMENT:
336
337 new_count++;
338 object->common.reference_count = new_count;
339
340 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
341 "Obj %p Refs=%X, [Incremented]\n",
342 object, new_count));
343 break;
344
345 case REF_DECREMENT:
346
347 if (count < 1) {
348 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
349 "Obj %p Refs=%X, can't decrement! (Set to 0)\n",
350 object, new_count));
351
352 new_count = 0;
353 } else {
354 new_count--;
355
356 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
357 "Obj %p Refs=%X, [Decremented]\n",
358 object, new_count));
359 }
360
361 if (ACPI_GET_OBJECT_TYPE(object) == ACPI_TYPE_METHOD) {
362 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
363 "Method Obj %p Refs=%X, [Decremented]\n",
364 object, new_count));
365 }
366
367 object->common.reference_count = new_count;
368 if (new_count == 0) {
369 acpi_ut_delete_internal_obj(object);
370 }
371 break;
372
373 case REF_FORCE_DELETE:
374
375 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
376 "Obj %p Refs=%X, Force delete! (Set to 0)\n",
377 object, count));
378
379 new_count = 0;
380 object->common.reference_count = new_count;
381 acpi_ut_delete_internal_obj(object);
382 break;
383
384 default:
385
386 ACPI_ERROR((AE_INFO, "Unknown action (%X)", action));
387 break;
388 }
389
390 /*
391 * Sanity check the reference count, for debug purposes only.
392 * (A deleted object will have a huge reference count)
393 */
394 if (count > ACPI_MAX_REFERENCE_COUNT) {
395 ACPI_WARNING((AE_INFO,
396 "Large Reference Count (%X) in object %p", count,
397 object));
398 }
399 }
400
401 /*******************************************************************************
402 *
403 * FUNCTION: acpi_ut_update_object_reference
404 *
405 * PARAMETERS: Object - Increment ref count for this object
406 * and all sub-objects
407 * Action - Either REF_INCREMENT or REF_DECREMENT or
408 * REF_FORCE_DELETE
409 *
410 * RETURN: Status
411 *
412 * DESCRIPTION: Increment the object reference count
413 *
414 * Object references are incremented when:
415 * 1) An object is attached to a Node (namespace object)
416 * 2) An object is copied (all subobjects must be incremented)
417 *
418 * Object references are decremented when:
419 * 1) An object is detached from an Node
420 *
421 ******************************************************************************/
422
423 acpi_status
424 acpi_ut_update_object_reference(union acpi_operand_object *object, u16 action)
425 {
426 acpi_status status = AE_OK;
427 union acpi_generic_state *state_list = NULL;
428 union acpi_operand_object *next_object = NULL;
429 union acpi_generic_state *state;
430 acpi_native_uint i;
431
432 ACPI_FUNCTION_TRACE_PTR(ut_update_object_reference, object);
433
434 while (object) {
435
436 /* Make sure that this isn't a namespace handle */
437
438 if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) {
439 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
440 "Object %p is NS handle\n", object));
441 return_ACPI_STATUS(AE_OK);
442 }
443
444 /*
445 * All sub-objects must have their reference count incremented also.
446 * Different object types have different subobjects.
447 */
448 switch (ACPI_GET_OBJECT_TYPE(object)) {
449 case ACPI_TYPE_DEVICE:
450 case ACPI_TYPE_PROCESSOR:
451 case ACPI_TYPE_POWER:
452 case ACPI_TYPE_THERMAL:
453
454 /* Update the notify objects for these types (if present) */
455
456 acpi_ut_update_ref_count(object->common_notify.
457 system_notify, action);
458 acpi_ut_update_ref_count(object->common_notify.
459 device_notify, action);
460 break;
461
462 case ACPI_TYPE_PACKAGE:
463 /*
464 * We must update all the sub-objects of the package,
465 * each of whom may have their own sub-objects.
466 */
467 for (i = 0; i < object->package.count; i++) {
468 /*
469 * Push each element onto the stack for later processing.
470 * Note: There can be null elements within the package,
471 * these are simply ignored
472 */
473 status =
474 acpi_ut_create_update_state_and_push
475 (object->package.elements[i], action,
476 &state_list);
477 if (ACPI_FAILURE(status)) {
478 goto error_exit;
479 }
480 }
481 break;
482
483 case ACPI_TYPE_BUFFER_FIELD:
484
485 next_object = object->buffer_field.buffer_obj;
486 break;
487
488 case ACPI_TYPE_LOCAL_REGION_FIELD:
489
490 next_object = object->field.region_obj;
491 break;
492
493 case ACPI_TYPE_LOCAL_BANK_FIELD:
494
495 next_object = object->bank_field.bank_obj;
496 status =
497 acpi_ut_create_update_state_and_push(object->
498 bank_field.
499 region_obj,
500 action,
501 &state_list);
502 if (ACPI_FAILURE(status)) {
503 goto error_exit;
504 }
505 break;
506
507 case ACPI_TYPE_LOCAL_INDEX_FIELD:
508
509 next_object = object->index_field.index_obj;
510 status =
511 acpi_ut_create_update_state_and_push(object->
512 index_field.
513 data_obj,
514 action,
515 &state_list);
516 if (ACPI_FAILURE(status)) {
517 goto error_exit;
518 }
519 break;
520
521 case ACPI_TYPE_LOCAL_REFERENCE:
522 /*
523 * The target of an Index (a package, string, or buffer) must track
524 * changes to the ref count of the index.
525 */
526 if (object->reference.opcode == AML_INDEX_OP) {
527 next_object = object->reference.object;
528 }
529 break;
530
531 case ACPI_TYPE_REGION:
532 default:
533 break; /* No subobjects for all other types */
534 }
535
536 /*
537 * Now we can update the count in the main object. This can only
538 * happen after we update the sub-objects in case this causes the
539 * main object to be deleted.
540 */
541 acpi_ut_update_ref_count(object, action);
542 object = NULL;
543
544 /* Move on to the next object to be updated */
545
546 if (next_object) {
547 object = next_object;
548 next_object = NULL;
549 } else if (state_list) {
550 state = acpi_ut_pop_generic_state(&state_list);
551 object = state->update.object;
552 acpi_ut_delete_generic_state(state);
553 }
554 }
555
556 return_ACPI_STATUS(AE_OK);
557
558 error_exit:
559
560 ACPI_EXCEPTION((AE_INFO, status,
561 "Could not update object reference count"));
562
563 return_ACPI_STATUS(status);
564 }
565
566 /*******************************************************************************
567 *
568 * FUNCTION: acpi_ut_add_reference
569 *
570 * PARAMETERS: Object - Object whose reference count is to be
571 * incremented
572 *
573 * RETURN: None
574 *
575 * DESCRIPTION: Add one reference to an ACPI object
576 *
577 ******************************************************************************/
578
579 void acpi_ut_add_reference(union acpi_operand_object *object)
580 {
581
582 ACPI_FUNCTION_TRACE_PTR(ut_add_reference, object);
583
584 /* Ensure that we have a valid object */
585
586 if (!acpi_ut_valid_internal_object(object)) {
587 return_VOID;
588 }
589
590 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
591 "Obj %p Current Refs=%X [To Be Incremented]\n",
592 object, object->common.reference_count));
593
594 /* Increment the reference count */
595
596 (void)acpi_ut_update_object_reference(object, REF_INCREMENT);
597 return_VOID;
598 }
599
600 /*******************************************************************************
601 *
602 * FUNCTION: acpi_ut_remove_reference
603 *
604 * PARAMETERS: Object - Object whose ref count will be decremented
605 *
606 * RETURN: None
607 *
608 * DESCRIPTION: Decrement the reference count of an ACPI internal object
609 *
610 ******************************************************************************/
611
612 void acpi_ut_remove_reference(union acpi_operand_object *object)
613 {
614
615 ACPI_FUNCTION_TRACE_PTR(ut_remove_reference, object);
616
617 /*
618 * Allow a NULL pointer to be passed in, just ignore it. This saves
619 * each caller from having to check. Also, ignore NS nodes.
620 *
621 */
622 if (!object ||
623 (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED)) {
624 return_VOID;
625 }
626
627 /* Ensure that we have a valid object */
628
629 if (!acpi_ut_valid_internal_object(object)) {
630 return_VOID;
631 }
632
633 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
634 "Obj %p Current Refs=%X [To Be Decremented]\n",
635 object, object->common.reference_count));
636
637 /*
638 * Decrement the reference count, and only actually delete the object
639 * if the reference count becomes 0. (Must also decrement the ref count
640 * of all subobjects!)
641 */
642 (void)acpi_ut_update_object_reference(object, REF_DECREMENT);
643 return_VOID;
644 }
linux-next