diff options
Diffstat (limited to 'drivers/acpi/acpica/utdelete.c')
| -rw-r--r-- | drivers/acpi/acpica/utdelete.c | 677 |
1 files changed, 677 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/utdelete.c b/drivers/acpi/acpica/utdelete.c new file mode 100644 index 00000000000..a0be9e39531 --- /dev/null +++ b/drivers/acpi/acpica/utdelete.c @@ -0,0 +1,677 @@ +/******************************************************************************* + * + * Module Name: utdelete - object deletion and reference count utilities + * + ******************************************************************************/ + +/* + * Copyright (C) 2000 - 2008, Intel Corp. + * 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 "accommon.h" +#include "acinterp.h" +#include "acnamesp.h" +#include "acevents.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; + + /* + * These objects have a possible list of notify handlers. + * Device object also may have a GPE block. + */ + case ACPI_TYPE_DEVICE: + + if (object->device.gpe_block) { + (void)acpi_ev_delete_gpe_block(object->device. + gpe_block); + } + + /*lint -fallthrough */ + + case ACPI_TYPE_PROCESSOR: + case ACPI_TYPE_THERMAL: + + /* Walk the notify handler list for this object */ + + handler_desc = object->common_notify.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 == 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; + + case ACPI_TYPE_LOCAL_BANK_FIELD: + + ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, + "***** Bank 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; + u32 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) or a named + * reference must track changes to the ref count of the index or + * target object. + */ + if ((object->reference.class == ACPI_REFCLASS_INDEX) || + (object->reference.class == ACPI_REFCLASS_NAME)) { + 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")); + + /* Free any stacked Update State objects */ + + while (state_list) { + state = acpi_ut_pop_generic_state(&state_list); + acpi_ut_delete_generic_state(state); + } + + 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; +} |