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622 lines
16 KiB
622 lines
16 KiB
/*******************************************************************************
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*
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* Module Name: utdelete - object deletion and reference count utilities
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/acinterp.h>
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#include <acpi/acnamesp.h>
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#include <acpi/acevents.h>
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#include <acpi/amlcode.h>
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#define _COMPONENT ACPI_UTILITIES
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ACPI_MODULE_NAME("utdelete")
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/* Local prototypes */
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static void acpi_ut_delete_internal_obj(union acpi_operand_object *object);
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static void
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acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_delete_internal_obj
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*
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* PARAMETERS: Object - Object to be deleted
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*
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* RETURN: None
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*
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* DESCRIPTION: Low level object deletion, after reference counts have been
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* updated (All reference counts, including sub-objects!)
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*
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******************************************************************************/
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static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
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{
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void *obj_pointer = NULL;
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union acpi_operand_object *handler_desc;
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union acpi_operand_object *second_desc;
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union acpi_operand_object *next_desc;
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ACPI_FUNCTION_TRACE_PTR("ut_delete_internal_obj", object);
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if (!object) {
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return_VOID;
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}
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/*
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* Must delete or free any pointers within the object that are not
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* actual ACPI objects (for example, a raw buffer pointer).
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*/
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switch (ACPI_GET_OBJECT_TYPE(object)) {
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case ACPI_TYPE_STRING:
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"**** String %p, ptr %p\n", object,
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object->string.pointer));
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/* Free the actual string buffer */
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if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
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/* But only if it is NOT a pointer into an ACPI table */
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obj_pointer = object->string.pointer;
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}
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break;
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case ACPI_TYPE_BUFFER:
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"**** Buffer %p, ptr %p\n", object,
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object->buffer.pointer));
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/* Free the actual buffer */
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if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
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/* But only if it is NOT a pointer into an ACPI table */
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obj_pointer = object->buffer.pointer;
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}
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break;
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case ACPI_TYPE_PACKAGE:
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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" **** Package of count %X\n",
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object->package.count));
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/*
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* Elements of the package are not handled here, they are deleted
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* separately
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*/
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/* Free the (variable length) element pointer array */
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obj_pointer = object->package.elements;
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break;
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case ACPI_TYPE_DEVICE:
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if (object->device.gpe_block) {
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(void)acpi_ev_delete_gpe_block(object->device.
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gpe_block);
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}
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/* Walk the handler list for this device */
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handler_desc = object->device.handler;
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while (handler_desc) {
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next_desc = handler_desc->address_space.next;
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acpi_ut_remove_reference(handler_desc);
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handler_desc = next_desc;
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}
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break;
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case ACPI_TYPE_MUTEX:
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"***** Mutex %p, Semaphore %p\n",
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object, object->mutex.semaphore));
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acpi_ex_unlink_mutex(object);
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(void)acpi_os_delete_semaphore(object->mutex.semaphore);
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break;
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case ACPI_TYPE_EVENT:
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"***** Event %p, Semaphore %p\n",
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object, object->event.semaphore));
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(void)acpi_os_delete_semaphore(object->event.semaphore);
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object->event.semaphore = NULL;
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break;
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case ACPI_TYPE_METHOD:
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"***** Method %p\n", object));
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/* Delete the method semaphore if it exists */
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if (object->method.semaphore) {
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(void)acpi_os_delete_semaphore(object->method.
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semaphore);
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object->method.semaphore = NULL;
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}
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break;
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case ACPI_TYPE_REGION:
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"***** Region %p\n", object));
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second_desc = acpi_ns_get_secondary_object(object);
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if (second_desc) {
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/*
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* Free the region_context if and only if the handler is one of the
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* default handlers -- and therefore, we created the context object
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* locally, it was not created by an external caller.
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*/
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handler_desc = object->region.handler;
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if (handler_desc) {
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if (handler_desc->address_space.
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hflags &
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ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
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obj_pointer =
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second_desc->extra.region_context;
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}
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acpi_ut_remove_reference(handler_desc);
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}
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/* Now we can free the Extra object */
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acpi_ut_delete_object_desc(second_desc);
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}
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break;
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case ACPI_TYPE_BUFFER_FIELD:
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"***** Buffer Field %p\n", object));
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second_desc = acpi_ns_get_secondary_object(object);
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if (second_desc) {
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acpi_ut_delete_object_desc(second_desc);
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}
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break;
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default:
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break;
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}
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/* Free any allocated memory (pointer within the object) found above */
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if (obj_pointer) {
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"Deleting Object Subptr %p\n", obj_pointer));
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ACPI_MEM_FREE(obj_pointer);
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}
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/* Now the object can be safely deleted */
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
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object, acpi_ut_get_object_type_name(object)));
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acpi_ut_delete_object_desc(object);
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_delete_internal_object_list
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*
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* PARAMETERS: obj_list - Pointer to the list to be deleted
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*
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* RETURN: None
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*
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* DESCRIPTION: This function deletes an internal object list, including both
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* simple objects and package objects
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*
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******************************************************************************/
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void acpi_ut_delete_internal_object_list(union acpi_operand_object **obj_list)
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{
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union acpi_operand_object **internal_obj;
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ACPI_FUNCTION_TRACE("ut_delete_internal_object_list");
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/* Walk the null-terminated internal list */
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for (internal_obj = obj_list; *internal_obj; internal_obj++) {
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acpi_ut_remove_reference(*internal_obj);
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}
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/* Free the combined parameter pointer list and object array */
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ACPI_MEM_FREE(obj_list);
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_update_ref_count
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*
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* PARAMETERS: Object - Object whose ref count is to be updated
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* Action - What to do
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*
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* RETURN: New ref count
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*
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* DESCRIPTION: Modify the ref count and return it.
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*
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******************************************************************************/
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static void
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acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action)
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{
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u16 count;
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u16 new_count;
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ACPI_FUNCTION_NAME("ut_update_ref_count");
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if (!object) {
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return;
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}
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count = object->common.reference_count;
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new_count = count;
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/*
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* Perform the reference count action
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* (increment, decrement, or force delete)
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*/
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switch (action) {
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case REF_INCREMENT:
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new_count++;
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object->common.reference_count = new_count;
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"Obj %p Refs=%X, [Incremented]\n",
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object, new_count));
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break;
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case REF_DECREMENT:
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if (count < 1) {
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"Obj %p Refs=%X, can't decrement! (Set to 0)\n",
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object, new_count));
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new_count = 0;
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} else {
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new_count--;
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"Obj %p Refs=%X, [Decremented]\n",
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object, new_count));
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}
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if (ACPI_GET_OBJECT_TYPE(object) == ACPI_TYPE_METHOD) {
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"Method Obj %p Refs=%X, [Decremented]\n",
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object, new_count));
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}
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object->common.reference_count = new_count;
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if (new_count == 0) {
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acpi_ut_delete_internal_obj(object);
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}
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break;
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case REF_FORCE_DELETE:
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"Obj %p Refs=%X, Force delete! (Set to 0)\n",
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object, count));
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new_count = 0;
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object->common.reference_count = new_count;
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acpi_ut_delete_internal_obj(object);
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break;
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown action (%X)\n",
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action));
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break;
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}
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/*
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* Sanity check the reference count, for debug purposes only.
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* (A deleted object will have a huge reference count)
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*/
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if (count > ACPI_MAX_REFERENCE_COUNT) {
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ACPI_DEBUG_PRINT((ACPI_DB_WARN,
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"**** Warning **** Large Reference Count (%X) in object %p\n\n",
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count, object));
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}
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return;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_update_object_reference
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*
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* PARAMETERS: Object - Increment ref count for this object
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* and all sub-objects
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* Action - Either REF_INCREMENT or REF_DECREMENT or
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* REF_FORCE_DELETE
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*
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* RETURN: Status
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*
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* DESCRIPTION: Increment the object reference count
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*
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* Object references are incremented when:
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* 1) An object is attached to a Node (namespace object)
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* 2) An object is copied (all subobjects must be incremented)
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*
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* Object references are decremented when:
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* 1) An object is detached from an Node
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*
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******************************************************************************/
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acpi_status
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acpi_ut_update_object_reference(union acpi_operand_object * object, u16 action)
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{
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acpi_status status = AE_OK;
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union acpi_generic_state *state_list = NULL;
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union acpi_operand_object *next_object = NULL;
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union acpi_generic_state *state;
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acpi_native_uint i;
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ACPI_FUNCTION_TRACE_PTR("ut_update_object_reference", object);
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while (object) {
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/* Make sure that this isn't a namespace handle */
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if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) {
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"Object %p is NS handle\n", object));
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return_ACPI_STATUS(AE_OK);
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}
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/*
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* All sub-objects must have their reference count incremented also.
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* Different object types have different subobjects.
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*/
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switch (ACPI_GET_OBJECT_TYPE(object)) {
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case ACPI_TYPE_DEVICE:
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acpi_ut_update_ref_count(object->device.system_notify,
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action);
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acpi_ut_update_ref_count(object->device.device_notify,
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action);
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break;
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case ACPI_TYPE_PACKAGE:
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/*
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* We must update all the sub-objects of the package,
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* each of whom may have their own sub-objects.
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*/
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for (i = 0; i < object->package.count; i++) {
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/*
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* Push each element onto the stack for later processing.
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* Note: There can be null elements within the package,
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* these are simply ignored
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*/
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status =
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acpi_ut_create_update_state_and_push
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(object->package.elements[i], action,
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&state_list);
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if (ACPI_FAILURE(status)) {
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goto error_exit;
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}
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}
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break;
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case ACPI_TYPE_BUFFER_FIELD:
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next_object = object->buffer_field.buffer_obj;
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break;
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case ACPI_TYPE_LOCAL_REGION_FIELD:
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next_object = object->field.region_obj;
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break;
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case ACPI_TYPE_LOCAL_BANK_FIELD:
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next_object = object->bank_field.bank_obj;
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status =
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acpi_ut_create_update_state_and_push(object->
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bank_field.
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region_obj,
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action,
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&state_list);
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if (ACPI_FAILURE(status)) {
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goto error_exit;
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}
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break;
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case ACPI_TYPE_LOCAL_INDEX_FIELD:
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next_object = object->index_field.index_obj;
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status =
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acpi_ut_create_update_state_and_push(object->
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index_field.
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data_obj,
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action,
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&state_list);
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if (ACPI_FAILURE(status)) {
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goto error_exit;
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}
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break;
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case ACPI_TYPE_LOCAL_REFERENCE:
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/*
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* The target of an Index (a package, string, or buffer) must track
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* changes to the ref count of the index.
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*/
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if (object->reference.opcode == AML_INDEX_OP) {
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next_object = object->reference.object;
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}
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break;
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case ACPI_TYPE_REGION:
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default:
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break; /* No subobjects */
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}
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/*
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* Now we can update the count in the main object. This can only
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* happen after we update the sub-objects in case this causes the
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* main object to be deleted.
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*/
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acpi_ut_update_ref_count(object, action);
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object = NULL;
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/* Move on to the next object to be updated */
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if (next_object) {
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object = next_object;
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next_object = NULL;
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} else if (state_list) {
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state = acpi_ut_pop_generic_state(&state_list);
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object = state->update.object;
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acpi_ut_delete_generic_state(state);
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}
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}
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return_ACPI_STATUS(AE_OK);
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error_exit:
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ACPI_REPORT_ERROR(("Could not update object reference count, %s\n",
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acpi_format_exception(status)));
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return_ACPI_STATUS(status);
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}
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|
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_add_reference
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*
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* PARAMETERS: Object - Object whose reference count is to be
|
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* incremented
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*
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* RETURN: None
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*
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* DESCRIPTION: Add one reference to an ACPI object
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*
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******************************************************************************/
|
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|
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void acpi_ut_add_reference(union acpi_operand_object *object)
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{
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ACPI_FUNCTION_TRACE_PTR("ut_add_reference", object);
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|
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/* Ensure that we have a valid object */
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|
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if (!acpi_ut_valid_internal_object(object)) {
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return_VOID;
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}
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|
|
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;
|
|
}
|
|
|