1 /*******************************************************************************
3 * Module Name: utdelete - object deletion and reference count utilities
5 ******************************************************************************/
8 * Copyright (C) 2000 - 2007, R. Byron Moore
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
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.
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>
50 #define _COMPONENT ACPI_UTILITIES
51 ACPI_MODULE_NAME("utdelete")
53 /* Local prototypes */
54 static void acpi_ut_delete_internal_obj(union acpi_operand_object
*object
);
57 acpi_ut_update_ref_count(union acpi_operand_object
*object
, u32 action
);
59 /*******************************************************************************
61 * FUNCTION: acpi_ut_delete_internal_obj
63 * PARAMETERS: Object - Object to be deleted
67 * DESCRIPTION: Low level object deletion, after reference counts have been
68 * updated (All reference counts, including sub-objects!)
70 ******************************************************************************/
72 static void acpi_ut_delete_internal_obj(union acpi_operand_object
*object
)
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
;
79 ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj
, object
);
86 * Must delete or free any pointers within the object that are not
87 * actual ACPI objects (for example, a raw buffer pointer).
89 switch (ACPI_GET_OBJECT_TYPE(object
)) {
90 case ACPI_TYPE_STRING
:
92 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
93 "**** String %p, ptr %p\n", object
,
94 object
->string
.pointer
));
96 /* Free the actual string buffer */
98 if (!(object
->common
.flags
& AOPOBJ_STATIC_POINTER
)) {
100 /* But only if it is NOT a pointer into an ACPI table */
102 obj_pointer
= object
->string
.pointer
;
106 case ACPI_TYPE_BUFFER
:
108 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
109 "**** Buffer %p, ptr %p\n", object
,
110 object
->buffer
.pointer
));
112 /* Free the actual buffer */
114 if (!(object
->common
.flags
& AOPOBJ_STATIC_POINTER
)) {
116 /* But only if it is NOT a pointer into an ACPI table */
118 obj_pointer
= object
->buffer
.pointer
;
122 case ACPI_TYPE_PACKAGE
:
124 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
125 " **** Package of count %X\n",
126 object
->package
.count
));
129 * Elements of the package are not handled here, they are deleted
133 /* Free the (variable length) element pointer array */
135 obj_pointer
= object
->package
.elements
;
138 case ACPI_TYPE_DEVICE
:
140 if (object
->device
.gpe_block
) {
141 (void)acpi_ev_delete_gpe_block(object
->device
.
145 /* Walk the handler list for this device */
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
;
155 case ACPI_TYPE_MUTEX
:
157 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
158 "***** Mutex %p, OS Mutex %p\n",
159 object
, object
->mutex
.os_mutex
));
161 if (object
== acpi_gbl_global_lock_mutex
) {
163 /* Global Lock has extra semaphore */
166 acpi_os_delete_semaphore
167 (acpi_gbl_global_lock_semaphore
);
168 acpi_gbl_global_lock_semaphore
= NULL
;
170 acpi_os_delete_mutex(object
->mutex
.os_mutex
);
171 acpi_gbl_global_lock_mutex
= NULL
;
173 acpi_ex_unlink_mutex(object
);
174 acpi_os_delete_mutex(object
->mutex
.os_mutex
);
178 case ACPI_TYPE_EVENT
:
180 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
181 "***** Event %p, OS Semaphore %p\n",
182 object
, object
->event
.os_semaphore
));
184 (void)acpi_os_delete_semaphore(object
->event
.os_semaphore
);
185 object
->event
.os_semaphore
= NULL
;
188 case ACPI_TYPE_METHOD
:
190 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
191 "***** Method %p\n", object
));
193 /* Delete the method mutex if it exists */
195 if (object
->method
.mutex
) {
196 acpi_os_delete_mutex(object
->method
.mutex
->mutex
.
198 acpi_ut_delete_object_desc(object
->method
.mutex
);
199 object
->method
.mutex
= NULL
;
203 case ACPI_TYPE_REGION
:
205 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
206 "***** Region %p\n", object
));
208 second_desc
= acpi_ns_get_secondary_object(object
);
211 * Free the region_context if and only if the handler is one of the
212 * default handlers -- and therefore, we created the context object
213 * locally, it was not created by an external caller.
215 handler_desc
= object
->region
.handler
;
217 if (handler_desc
->address_space
.handler_flags
&
218 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED
) {
220 /* Deactivate region and free region context */
222 if (handler_desc
->address_space
.setup
) {
224 address_space
.setup(object
,
225 ACPI_REGION_DEACTIVATE
,
235 acpi_ut_remove_reference(handler_desc
);
238 /* Now we can free the Extra object */
240 acpi_ut_delete_object_desc(second_desc
);
244 case ACPI_TYPE_BUFFER_FIELD
:
246 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
247 "***** Buffer Field %p\n", object
));
249 second_desc
= acpi_ns_get_secondary_object(object
);
251 acpi_ut_delete_object_desc(second_desc
);
255 case ACPI_TYPE_LOCAL_BANK_FIELD
:
257 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
258 "***** Bank Field %p\n", object
));
260 second_desc
= acpi_ns_get_secondary_object(object
);
262 acpi_ut_delete_object_desc(second_desc
);
270 /* Free any allocated memory (pointer within the object) found above */
273 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
274 "Deleting Object Subptr %p\n", obj_pointer
));
275 ACPI_FREE(obj_pointer
);
278 /* Now the object can be safely deleted */
280 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
, "Deleting Object %p [%s]\n",
281 object
, acpi_ut_get_object_type_name(object
)));
283 acpi_ut_delete_object_desc(object
);
287 /*******************************************************************************
289 * FUNCTION: acpi_ut_delete_internal_object_list
291 * PARAMETERS: obj_list - Pointer to the list to be deleted
295 * DESCRIPTION: This function deletes an internal object list, including both
296 * simple objects and package objects
298 ******************************************************************************/
300 void acpi_ut_delete_internal_object_list(union acpi_operand_object
**obj_list
)
302 union acpi_operand_object
**internal_obj
;
304 ACPI_FUNCTION_TRACE(ut_delete_internal_object_list
);
306 /* Walk the null-terminated internal list */
308 for (internal_obj
= obj_list
; *internal_obj
; internal_obj
++) {
309 acpi_ut_remove_reference(*internal_obj
);
312 /* Free the combined parameter pointer list and object array */
318 /*******************************************************************************
320 * FUNCTION: acpi_ut_update_ref_count
322 * PARAMETERS: Object - Object whose ref count is to be updated
323 * Action - What to do
325 * RETURN: New ref count
327 * DESCRIPTION: Modify the ref count and return it.
329 ******************************************************************************/
332 acpi_ut_update_ref_count(union acpi_operand_object
*object
, u32 action
)
337 ACPI_FUNCTION_NAME(ut_update_ref_count
);
343 count
= object
->common
.reference_count
;
347 * Perform the reference count action (increment, decrement, force delete)
353 object
->common
.reference_count
= new_count
;
355 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
356 "Obj %p Refs=%X, [Incremented]\n",
363 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
364 "Obj %p Refs=%X, can't decrement! (Set to 0)\n",
371 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
372 "Obj %p Refs=%X, [Decremented]\n",
376 if (ACPI_GET_OBJECT_TYPE(object
) == ACPI_TYPE_METHOD
) {
377 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
378 "Method Obj %p Refs=%X, [Decremented]\n",
382 object
->common
.reference_count
= new_count
;
383 if (new_count
== 0) {
384 acpi_ut_delete_internal_obj(object
);
388 case REF_FORCE_DELETE
:
390 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
391 "Obj %p Refs=%X, Force delete! (Set to 0)\n",
395 object
->common
.reference_count
= new_count
;
396 acpi_ut_delete_internal_obj(object
);
401 ACPI_ERROR((AE_INFO
, "Unknown action (%X)", action
));
406 * Sanity check the reference count, for debug purposes only.
407 * (A deleted object will have a huge reference count)
409 if (count
> ACPI_MAX_REFERENCE_COUNT
) {
410 ACPI_WARNING((AE_INFO
,
411 "Large Reference Count (%X) in object %p", count
,
416 /*******************************************************************************
418 * FUNCTION: acpi_ut_update_object_reference
420 * PARAMETERS: Object - Increment ref count for this object
421 * and all sub-objects
422 * Action - Either REF_INCREMENT or REF_DECREMENT or
427 * DESCRIPTION: Increment the object reference count
429 * Object references are incremented when:
430 * 1) An object is attached to a Node (namespace object)
431 * 2) An object is copied (all subobjects must be incremented)
433 * Object references are decremented when:
434 * 1) An object is detached from an Node
436 ******************************************************************************/
439 acpi_ut_update_object_reference(union acpi_operand_object
*object
, u16 action
)
441 acpi_status status
= AE_OK
;
442 union acpi_generic_state
*state_list
= NULL
;
443 union acpi_operand_object
*next_object
= NULL
;
444 union acpi_generic_state
*state
;
447 ACPI_FUNCTION_TRACE_PTR(ut_update_object_reference
, object
);
451 /* Make sure that this isn't a namespace handle */
453 if (ACPI_GET_DESCRIPTOR_TYPE(object
) == ACPI_DESC_TYPE_NAMED
) {
454 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
455 "Object %p is NS handle\n", object
));
456 return_ACPI_STATUS(AE_OK
);
460 * All sub-objects must have their reference count incremented also.
461 * Different object types have different subobjects.
463 switch (ACPI_GET_OBJECT_TYPE(object
)) {
464 case ACPI_TYPE_DEVICE
:
465 case ACPI_TYPE_PROCESSOR
:
466 case ACPI_TYPE_POWER
:
467 case ACPI_TYPE_THERMAL
:
469 /* Update the notify objects for these types (if present) */
471 acpi_ut_update_ref_count(object
->common_notify
.
472 system_notify
, action
);
473 acpi_ut_update_ref_count(object
->common_notify
.
474 device_notify
, action
);
477 case ACPI_TYPE_PACKAGE
:
479 * We must update all the sub-objects of the package,
480 * each of whom may have their own sub-objects.
482 for (i
= 0; i
< object
->package
.count
; i
++) {
484 * Push each element onto the stack for later processing.
485 * Note: There can be null elements within the package,
486 * these are simply ignored
489 acpi_ut_create_update_state_and_push
490 (object
->package
.elements
[i
], action
,
492 if (ACPI_FAILURE(status
)) {
498 case ACPI_TYPE_BUFFER_FIELD
:
500 next_object
= object
->buffer_field
.buffer_obj
;
503 case ACPI_TYPE_LOCAL_REGION_FIELD
:
505 next_object
= object
->field
.region_obj
;
508 case ACPI_TYPE_LOCAL_BANK_FIELD
:
510 next_object
= object
->bank_field
.bank_obj
;
512 acpi_ut_create_update_state_and_push(object
->
517 if (ACPI_FAILURE(status
)) {
522 case ACPI_TYPE_LOCAL_INDEX_FIELD
:
524 next_object
= object
->index_field
.index_obj
;
526 acpi_ut_create_update_state_and_push(object
->
531 if (ACPI_FAILURE(status
)) {
536 case ACPI_TYPE_LOCAL_REFERENCE
:
538 * The target of an Index (a package, string, or buffer) or a named
539 * reference must track changes to the ref count of the index or
542 if ((object
->reference
.opcode
== AML_INDEX_OP
) ||
543 (object
->reference
.opcode
== AML_INT_NAMEPATH_OP
)) {
544 next_object
= object
->reference
.object
;
548 case ACPI_TYPE_REGION
:
550 break; /* No subobjects for all other types */
554 * Now we can update the count in the main object. This can only
555 * happen after we update the sub-objects in case this causes the
556 * main object to be deleted.
558 acpi_ut_update_ref_count(object
, action
);
561 /* Move on to the next object to be updated */
564 object
= next_object
;
566 } else if (state_list
) {
567 state
= acpi_ut_pop_generic_state(&state_list
);
568 object
= state
->update
.object
;
569 acpi_ut_delete_generic_state(state
);
573 return_ACPI_STATUS(AE_OK
);
577 ACPI_EXCEPTION((AE_INFO
, status
,
578 "Could not update object reference count"));
580 return_ACPI_STATUS(status
);
583 /*******************************************************************************
585 * FUNCTION: acpi_ut_add_reference
587 * PARAMETERS: Object - Object whose reference count is to be
592 * DESCRIPTION: Add one reference to an ACPI object
594 ******************************************************************************/
596 void acpi_ut_add_reference(union acpi_operand_object
*object
)
599 ACPI_FUNCTION_TRACE_PTR(ut_add_reference
, object
);
601 /* Ensure that we have a valid object */
603 if (!acpi_ut_valid_internal_object(object
)) {
607 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
608 "Obj %p Current Refs=%X [To Be Incremented]\n",
609 object
, object
->common
.reference_count
));
611 /* Increment the reference count */
613 (void)acpi_ut_update_object_reference(object
, REF_INCREMENT
);
617 /*******************************************************************************
619 * FUNCTION: acpi_ut_remove_reference
621 * PARAMETERS: Object - Object whose ref count will be decremented
625 * DESCRIPTION: Decrement the reference count of an ACPI internal object
627 ******************************************************************************/
629 void acpi_ut_remove_reference(union acpi_operand_object
*object
)
632 ACPI_FUNCTION_TRACE_PTR(ut_remove_reference
, object
);
635 * Allow a NULL pointer to be passed in, just ignore it. This saves
636 * each caller from having to check. Also, ignore NS nodes.
640 (ACPI_GET_DESCRIPTOR_TYPE(object
) == ACPI_DESC_TYPE_NAMED
)) {
644 /* Ensure that we have a valid object */
646 if (!acpi_ut_valid_internal_object(object
)) {
650 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS
,
651 "Obj %p Current Refs=%X [To Be Decremented]\n",
652 object
, object
->common
.reference_count
));
655 * Decrement the reference count, and only actually delete the object
656 * if the reference count becomes 0. (Must also decrement the ref count
657 * of all subobjects!)
659 (void)acpi_ut_update_object_reference(object
, REF_DECREMENT
);