/*******************************************************************************
*
* Module Name: utdelete - object deletion and reference count utilities
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2006, R. Byron Moore
* 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 <acpi/acinterp.h>
#include <acpi/acnamesp.h>
#include <acpi/acevents.h>
#include <acpi/amlcode.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;
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 (ACPI_GET_OBJECT_TYPE(object)) {
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;
case ACPI_TYPE_DEVICE:
if (object->device.gpe_block) {
(void)acpi_ev_delete_gpe_block(object->device.
gpe_block);
}
/* Walk the handler list for this device */
handler_desc = object->device.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, Semaphore %p\n",
object, object->mutex.semaphore));
acpi_ex_unlink_mutex(object);
(void)acpi_os_delete_semaphore(object->mutex.semaphore);
break;
case ACPI_TYPE_EVENT:
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"***** Event %p, Semaphore %p\n",
object, object->event.semaphore));
(void)acpi_os_delete_semaphore(object->event.semaphore);
object->event.semaphore = NULL;
break;
case ACPI_TYPE_METHOD:
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"***** Method %p\n", object));
/* Delete the method semaphore if it exists */
if (object->method.semaphore) {
(void)acpi_os_delete_semaphore(object->method.
semaphore);
object->method.semaphore = NULL;
}
break;
case ACPI_TYPE_REGION:
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"***** Region %p\n", object));
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) {
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;
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 (ACPI_GET_OBJECT_TYPE(object) == 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 (%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 (%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;
acpi_native_uint 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 (ACPI_GET_OBJECT_TYPE(object)) {
case ACPI_TYPE_DEVICE:
acpi_ut_update_ref_count(object->device.system_notify,
action);
acpi_ut_update_ref_count(object->device.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) must track
* changes to the ref count of the index.
*/
if (object->reference.opcode == AML_INDEX_OP) {
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"));
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;
}
