diff options
Diffstat (limited to 'drivers/acpi/utilities/utdelete.c')
| -rw-r--r-- | drivers/acpi/utilities/utdelete.c | 700 |
1 files changed, 700 insertions, 0 deletions
diff --git a/drivers/acpi/utilities/utdelete.c b/drivers/acpi/utilities/utdelete.c new file mode 100644 index 000000000000..9a52ad52a23a --- /dev/null +++ b/drivers/acpi/utilities/utdelete.c @@ -0,0 +1,700 @@ +/******************************************************************************* + * + * Module Name: utdelete - object deletion and reference count utilities + * + ******************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, 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") + + +/******************************************************************************* + * + * 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 ( + 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.hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) { + obj_pointer = 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_MEM_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_MEM_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, or 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_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 > ACPI_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 ( + union acpi_operand_object *object, + u16 action) +{ + acpi_status status; + u32 i; + union acpi_generic_state *state_list = NULL; + union acpi_generic_state *state; + union acpi_operand_object *tmp; + + ACPI_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 */ + + 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); + } + + 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 (ACPI_GET_OBJECT_TYPE (object)) { + case ACPI_TYPE_DEVICE: + + tmp = object->device.system_notify; + if (tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT) + object->device.system_notify = NULL; + acpi_ut_update_ref_count (tmp, action); + + tmp = object->device.device_notify; + if (tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT) + object->device.device_notify = NULL; + acpi_ut_update_ref_count (tmp, 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, 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)) { + goto error_exit; + } + + tmp = object->package.elements[i]; + if (tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT) + object->package.elements[i] = NULL; + } + 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)) { + goto error_exit; + } + + tmp = object->buffer_field.buffer_obj; + if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT) + object->buffer_field.buffer_obj = NULL; + break; + + + case ACPI_TYPE_LOCAL_REGION_FIELD: + + status = acpi_ut_create_update_state_and_push ( + object->field.region_obj, action, &state_list); + if (ACPI_FAILURE (status)) { + goto error_exit; + } + + tmp = object->field.region_obj; + if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT) + object->field.region_obj = NULL; + break; + + + case ACPI_TYPE_LOCAL_BANK_FIELD: + + status = acpi_ut_create_update_state_and_push ( + object->bank_field.bank_obj, action, &state_list); + if (ACPI_FAILURE (status)) { + goto error_exit; + } + + tmp = object->bank_field.bank_obj; + if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT) + object->bank_field.bank_obj = NULL; + + status = acpi_ut_create_update_state_and_push ( + object->bank_field.region_obj, action, &state_list); + if (ACPI_FAILURE (status)) { + goto error_exit; + } + + tmp = object->bank_field.region_obj; + if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT) + object->bank_field.region_obj = NULL; + break; + + + case ACPI_TYPE_LOCAL_INDEX_FIELD: + + status = acpi_ut_create_update_state_and_push ( + object->index_field.index_obj, action, &state_list); + if (ACPI_FAILURE (status)) { + goto error_exit; + } + + tmp = object->index_field.index_obj; + if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT) + object->index_field.index_obj = NULL; + + status = acpi_ut_create_update_state_and_push ( + object->index_field.data_obj, action, &state_list); + if (ACPI_FAILURE (status)) { + goto error_exit; + } + + tmp = object->index_field.data_obj; + if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT) + object->index_field.data_obj = NULL; + 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) { + status = acpi_ut_create_update_state_and_push ( + object->reference.object, action, &state_list); + if (ACPI_FAILURE (status)) { + goto error_exit; + } + } + break; + + + case ACPI_TYPE_REGION: + default: + + /* 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); + + +error_exit: + + ACPI_REPORT_ERROR (("Could not update object reference count, %s\n", + acpi_format_exception (status))); + + 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; +} + + |