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/*******************************************************************************

 *

 * Module Name: utdelete - object deletion and reference count utilities

 *

 ******************************************************************************/

/*

 * Copyright (C) 2000 - 2007, 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, OS Mutex %p\n",

                                  object, object->mutex.os_mutex));

                if (object->mutex.os_mutex == acpi_gbl_global_lock_mutex) {

                        /* Global Lock has extra semaphore */

                        (void)

                            acpi_os_delete_semaphore

                            (acpi_gbl_global_lock_semaphore);

                        acpi_gbl_global_lock_semaphore = NULL;

                        acpi_os_delete_mutex(object->mutex.os_mutex);

                        acpi_gbl_global_lock_mutex = NULL;

                } else {

                        acpi_ex_unlink_mutex(object);

                        acpi_os_delete_mutex(object->mutex.os_mutex);

                }

                break;

        case ACPI_TYPE_EVENT:

                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,

                                  "***** Event %p, OS Semaphore %p\n",

                                  object, object->event.os_semaphore));

                (void)acpi_os_delete_semaphore(object->event.os_semaphore);

                object->event.os_semaphore = NULL;

                break;

        case ACPI_TYPE_METHOD:

                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,

                                  "***** Method %p\n", object));

                /* Delete the method mutex if it exists */

                if (object->method.mutex) {

                        acpi_os_delete_mutex(object->method.mutex->mutex.

                                             os_mutex);

                        acpi_ut_delete_object_desc(object->method.mutex);

                        object->method.mutex = 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:

                case ACPI_TYPE_PROCESSOR:

                case ACPI_TYPE_POWER:

                case ACPI_TYPE_THERMAL:

                        /* Update the notify objects for these types (if present) */

                        acpi_ut_update_ref_count(object->common_notify.

                                                 system_notify, action);

                        acpi_ut_update_ref_count(object->common_notify.

                                                 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;

}