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/*******************************************************************************
*
* Module Name: utdelete - object deletion and reference count utilities
* $Revision: 81 $
*
******************************************************************************/
/*
* Copyright (C) 2000, 2001 R. Byron Moore
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "acpi.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "actables.h"
#include "acparser.h"
#define _COMPONENT ACPI_UTILITIES
MODULE_NAME ("utdelete")
/*******************************************************************************
*
* FUNCTION: Acpi_ut_delete_internal_obj
*
* PARAMETERS: *Object - Pointer to the list to be deleted
*
* RETURN: None
*
* DESCRIPTION: Low level object deletion, after reference counts have been
* updated (All reference counts, including sub-objects!)
*
******************************************************************************/
void
acpi_ut_delete_internal_obj (
acpi_operand_object *object)
{
void *obj_pointer = NULL;
acpi_operand_object *handler_desc;
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_INFO, "**** String %p, ptr %p\n",
object, object->string.pointer));
/* Free the actual string buffer */
if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
obj_pointer = object->string.pointer;
}
break;
case ACPI_TYPE_BUFFER:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "**** Buffer %p, ptr %p\n",
object, object->buffer.pointer));
/* Free the actual buffer */
obj_pointer = object->buffer.pointer;
break;
case ACPI_TYPE_PACKAGE:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, " **** 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_MUTEX:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "***** Mutex %p, Semaphore %p\n",
object, object->mutex.semaphore));
acpi_ex_unlink_mutex (object);
acpi_os_delete_semaphore (object->mutex.semaphore);
break;
case ACPI_TYPE_EVENT:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "***** Event %p, Semaphore %p\n",
object, object->event.semaphore));
acpi_os_delete_semaphore (object->event.semaphore);
object->event.semaphore = NULL;
break;
case ACPI_TYPE_METHOD:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "***** Method %p\n", object));
/* Delete the method semaphore if it exists */
if (object->method.semaphore) {
acpi_os_delete_semaphore (object->method.semaphore);
object->method.semaphore = NULL;
}
break;
case ACPI_TYPE_REGION:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "***** Region %p\n", object));
if (object->region.extra) {
/*
* 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.addr_handler;
if ((handler_desc) &&
(handler_desc->addr_handler.hflags == ADDR_HANDLER_DEFAULT_INSTALLED)) {
obj_pointer = object->region.extra->extra.region_context;
}
/* Now we can free the Extra object */
acpi_ut_delete_object_desc (object->region.extra);
}
break;
case ACPI_TYPE_BUFFER_FIELD:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "***** Buffer Field %p\n", object));
if (object->buffer_field.extra) {
acpi_ut_delete_object_desc (object->buffer_field.extra);
}
break;
default:
break;
}
/*
* Delete any allocated memory found above
*/
if (obj_pointer) {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Deleting Obj Ptr %p \n", obj_pointer));
ACPI_MEM_FREE (obj_pointer);
}
/* Only delete the object if it was dynamically allocated */
if (object->common.flags & AOPOBJ_STATIC_ALLOCATION) {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Object %p [%s] static allocation, no delete\n",
object, acpi_ut_get_type_name (object->common.type)));
}
if (!(object->common.flags & AOPOBJ_STATIC_ALLOCATION)) {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Deleting object %p [%s]\n",
object, acpi_ut_get_type_name (object->common.type)));
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: Status - the status of the call
*
* DESCRIPTION: This function deletes an internal object list, including both
* simple objects and package objects
*
******************************************************************************/
acpi_status
acpi_ut_delete_internal_object_list (
acpi_operand_object **obj_list)
{
acpi_operand_object **internal_obj;
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_MEM_FREE (obj_list);
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* 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 (
acpi_operand_object *object,
u32 action)
{
u16 count;
u16 new_count;
PROC_NAME ("Ut_update_ref_count");
if (!object) {
return;
}
count = object->common.reference_count;
new_count = count;
/*
* Reference count action (increment, decrement, or force delete)
*/
switch (action) {
case REF_INCREMENT:
new_count++;
object->common.reference_count = new_count;
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Obj %p Refs=%X, [Incremented]\n",
object, new_count));
break;
case REF_DECREMENT:
if (count < 1) {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "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_INFO, "Obj %p Refs=%X, [Decremented]\n",
object, new_count));
}
if (object->common.type == ACPI_TYPE_METHOD) {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "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_INFO, "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_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown action (%X)\n", action));
break;
}
/*
* Sanity check the reference count, for debug purposes only.
* (A deleted object will have a huge reference count)
*/
if (count > MAX_REFERENCE_COUNT) {
ACPI_DEBUG_PRINT ((ACPI_DB_WARN,
"**** Warning **** Large Reference Count (%X) in object %p\n\n",
count, object));
}
return;
}
/*******************************************************************************
*
* 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 (
acpi_operand_object *object,
u16 action)
{
acpi_status status;
u32 i;
acpi_operand_object *next;
acpi_operand_object *new;
acpi_generic_state *state_list = NULL;
acpi_generic_state *state;
FUNCTION_TRACE_PTR ("Ut_update_object_reference", object);
/* Ignore a null object ptr */
if (!object) {
return_ACPI_STATUS (AE_OK);
}
/*
* Make sure that this isn't a namespace handle or an AML pointer
*/
if (VALID_DESCRIPTOR_TYPE (object, ACPI_DESC_TYPE_NAMED)) {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Object %p is NS handle\n", object));
return_ACPI_STATUS (AE_OK);
}
state = acpi_ut_create_update_state (object, action);
while (state) {
object = state->update.object;
action = state->update.value;
acpi_ut_delete_generic_state (state);
/*
* All sub-objects must have their reference count incremented also.
* Different object types have different subobjects.
*/
switch (object->common.type) {
case ACPI_TYPE_DEVICE:
status = acpi_ut_create_update_state_and_push (object->device.addr_handler,
action, &state_list);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
acpi_ut_update_ref_count (object->device.sys_handler, action);
acpi_ut_update_ref_count (object->device.drv_handler, action);
break;
case INTERNAL_TYPE_ADDRESS_HANDLER:
/* Must walk list of address handlers */
next = object->addr_handler.next;
while (next) {
new = next->addr_handler.next;
acpi_ut_update_ref_count (next, action);
next = new;
}
break;
case ACPI_TYPE_PACKAGE:
/*
* We must update all the sub-objects of the package
* (Each of whom may have their own sub-objects, etc.
*/
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)) {
return_ACPI_STATUS (status);
}
}
break;
case ACPI_TYPE_BUFFER_FIELD:
status = acpi_ut_create_update_state_and_push (
object->buffer_field.buffer_obj, action, &state_list);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
break;
case INTERNAL_TYPE_REGION_FIELD:
status = acpi_ut_create_update_state_and_push (
object->field.region_obj, action, &state_list);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
break;
case INTERNAL_TYPE_BANK_FIELD:
status = acpi_ut_create_update_state_and_push (
object->bank_field.bank_register_obj, action, &state_list);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
status = acpi_ut_create_update_state_and_push (
object->bank_field.region_obj, action, &state_list);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
break;
case INTERNAL_TYPE_INDEX_FIELD:
status = acpi_ut_create_update_state_and_push (
object->index_field.index_obj, action, &state_list);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
status = acpi_ut_create_update_state_and_push (
object->index_field.data_obj, action, &state_list);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
break;
case ACPI_TYPE_REGION:
case INTERNAL_TYPE_REFERENCE:
/* No subobjects */
break;
}
/*
* 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);
/* Move on to the next object to be updated */
state = acpi_ut_pop_generic_state (&state_list);
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* 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 (
acpi_operand_object *object)
{
FUNCTION_TRACE_PTR ("Ut_add_reference", object);
/*
* Ensure that we have a valid object
*/
if (!acpi_ut_valid_internal_object (object)) {
return_VOID;
}
/*
* We have a valid ACPI internal object, now increment the reference count
*/
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 (
acpi_operand_object *object)
{
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 ||
(VALID_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_INFO, "Obj %p Refs=%X\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!)
*/
acpi_ut_update_object_reference (object, REF_DECREMENT);
return_VOID;
}
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