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741 lines
19 KiB
741 lines
19 KiB
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
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/******************************************************************************* |
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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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#include <acpi/acpi.h> |
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#include "accommon.h" |
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#include "acinterp.h" |
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#include "acnamesp.h" |
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#include "acevents.h" |
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|
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#define _COMPONENT ACPI_UTILITIES |
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ACPI_MODULE_NAME("utdelete") |
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|
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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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|
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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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* |
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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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|
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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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union acpi_operand_object *start_desc; |
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union acpi_operand_object **last_obj_ptr; |
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|
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ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object); |
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|
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if (!object) { |
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return_VOID; |
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} |
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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 (object->common.type) { |
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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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|
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/* Free the actual string buffer */ |
|
|
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if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) { |
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|
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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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|
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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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|
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/* Free the actual buffer */ |
|
|
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if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) { |
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|
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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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|
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obj_pointer = object->package.elements; |
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break; |
|
|
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/* |
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* These objects have a possible list of notify handlers. |
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* Device object also may have a GPE block. |
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*/ |
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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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|
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ACPI_FALLTHROUGH; |
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|
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case ACPI_TYPE_PROCESSOR: |
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case ACPI_TYPE_THERMAL: |
|
|
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/* Walk the address handler list for this object */ |
|
|
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handler_desc = object->common_notify.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, OS Mutex %p\n", |
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object, object->mutex.os_mutex)); |
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|
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if (object == acpi_gbl_global_lock_mutex) { |
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|
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/* Global Lock has extra semaphore */ |
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|
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(void) |
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acpi_os_delete_semaphore |
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(acpi_gbl_global_lock_semaphore); |
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acpi_gbl_global_lock_semaphore = NULL; |
|
|
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acpi_os_delete_mutex(object->mutex.os_mutex); |
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acpi_gbl_global_lock_mutex = NULL; |
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} else { |
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acpi_ex_unlink_mutex(object); |
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acpi_os_delete_mutex(object->mutex.os_mutex); |
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} |
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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, OS Semaphore %p\n", |
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object, object->event.os_semaphore)); |
|
|
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(void)acpi_os_delete_semaphore(object->event.os_semaphore); |
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object->event.os_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 mutex if it exists */ |
|
|
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if (object->method.mutex) { |
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acpi_os_delete_mutex(object->method.mutex->mutex. |
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os_mutex); |
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acpi_ut_delete_object_desc(object->method.mutex); |
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object->method.mutex = NULL; |
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} |
|
|
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if (object->method.node) { |
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object->method.node = NULL; |
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} |
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break; |
|
|
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case ACPI_TYPE_REGION: |
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, |
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"***** Region %p\n", object)); |
|
|
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/* |
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* Update address_range list. However, only permanent regions |
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* are installed in this list. (Not created within a method) |
|
*/ |
|
if (!(object->region.node->flags & ANOBJ_TEMPORARY)) { |
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acpi_ut_remove_address_range(object->region.space_id, |
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object->region.node); |
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} |
|
|
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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) { |
|
next_desc = |
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handler_desc->address_space.region_list; |
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start_desc = next_desc; |
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last_obj_ptr = |
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&handler_desc->address_space.region_list; |
|
|
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/* Remove the region object from the handler list */ |
|
|
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while (next_desc) { |
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if (next_desc == object) { |
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*last_obj_ptr = |
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next_desc->region.next; |
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break; |
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} |
|
|
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/* Walk the linked list of handlers */ |
|
|
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last_obj_ptr = &next_desc->region.next; |
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next_desc = next_desc->region.next; |
|
|
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/* Prevent infinite loop if list is corrupted */ |
|
|
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if (next_desc == start_desc) { |
|
ACPI_ERROR((AE_INFO, |
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"Circular region list in address handler object %p", |
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handler_desc)); |
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return_VOID; |
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} |
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} |
|
|
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if (handler_desc->address_space.handler_flags & |
|
ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) { |
|
|
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/* Deactivate region and free region context */ |
|
|
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if (handler_desc->address_space.setup) { |
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(void)handler_desc-> |
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address_space.setup(object, |
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ACPI_REGION_DEACTIVATE, |
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handler_desc-> |
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address_space. |
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context, |
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&second_desc-> |
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extra. |
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region_context); |
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} |
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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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if (object->field.internal_pcc_buffer) { |
|
ACPI_FREE(object->field.internal_pcc_buffer); |
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} |
|
|
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break; |
|
|
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case ACPI_TYPE_BUFFER_FIELD: |
|
|
|
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); |
|
if (second_desc) { |
|
acpi_ut_delete_object_desc(second_desc); |
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} |
|
break; |
|
|
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case ACPI_TYPE_LOCAL_BANK_FIELD: |
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, |
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"***** Bank 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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case ACPI_TYPE_LOCAL_ADDRESS_HANDLER: |
|
|
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, |
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"***** Address handler %p\n", object)); |
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|
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acpi_os_delete_mutex(object->address_space.context_mutex); |
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break; |
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|
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default: |
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|
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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_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_RAW((ACPI_DB_ALLOCATIONS, |
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"%s: Deleting Object %p [%s]\n", |
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ACPI_GET_FUNCTION_NAME, object, |
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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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} |
|
|
|
/******************************************************************************* |
|
* |
|
* 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 |
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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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|
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ACPI_FUNCTION_ENTRY(); |
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|
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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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} |
|
|
|
/* Free the combined parameter pointer list and object array */ |
|
|
|
ACPI_FREE(obj_list); |
|
return; |
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} |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_ut_update_ref_count |
|
* |
|
* PARAMETERS: object - Object whose ref count is to be updated |
|
* action - What to do (REF_INCREMENT or REF_DECREMENT) |
|
* |
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* RETURN: None. Sets new reference count within the object |
|
* |
|
* DESCRIPTION: Modify the reference count for an internal acpi object |
|
* |
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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) |
|
{ |
|
u16 original_count; |
|
u16 new_count = 0; |
|
acpi_cpu_flags lock_flags; |
|
char *message; |
|
|
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ACPI_FUNCTION_NAME(ut_update_ref_count); |
|
|
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if (!object) { |
|
return; |
|
} |
|
|
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/* |
|
* Always get the reference count lock. Note: Interpreter and/or |
|
* Namespace is not always locked when this function is called. |
|
*/ |
|
lock_flags = acpi_os_acquire_lock(acpi_gbl_reference_count_lock); |
|
original_count = object->common.reference_count; |
|
|
|
/* Perform the reference count action (increment, decrement) */ |
|
|
|
switch (action) { |
|
case REF_INCREMENT: |
|
|
|
new_count = original_count + 1; |
|
object->common.reference_count = new_count; |
|
acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags); |
|
|
|
/* The current reference count should never be zero here */ |
|
|
|
if (!original_count) { |
|
ACPI_WARNING((AE_INFO, |
|
"Obj %p, Reference Count was zero before increment\n", |
|
object)); |
|
} |
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, |
|
"Obj %p Type %.2X [%s] Refs %.2X [Incremented]\n", |
|
object, object->common.type, |
|
acpi_ut_get_object_type_name(object), |
|
new_count)); |
|
message = "Incremement"; |
|
break; |
|
|
|
case REF_DECREMENT: |
|
|
|
/* The current reference count must be non-zero */ |
|
|
|
if (original_count) { |
|
new_count = original_count - 1; |
|
object->common.reference_count = new_count; |
|
} |
|
|
|
acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags); |
|
|
|
if (!original_count) { |
|
ACPI_WARNING((AE_INFO, |
|
"Obj %p, Reference Count is already zero, cannot decrement\n", |
|
object)); |
|
} |
|
|
|
ACPI_DEBUG_PRINT_RAW((ACPI_DB_ALLOCATIONS, |
|
"%s: Obj %p Type %.2X Refs %.2X [Decremented]\n", |
|
ACPI_GET_FUNCTION_NAME, object, |
|
object->common.type, new_count)); |
|
|
|
/* Actually delete the object on a reference count of zero */ |
|
|
|
if (new_count == 0) { |
|
acpi_ut_delete_internal_obj(object); |
|
} |
|
message = "Decrement"; |
|
break; |
|
|
|
default: |
|
|
|
acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags); |
|
ACPI_ERROR((AE_INFO, "Unknown Reference Count action (0x%X)", |
|
action)); |
|
return; |
|
} |
|
|
|
/* |
|
* Sanity check the reference count, for debug purposes only. |
|
* (A deleted object will have a huge reference count) |
|
*/ |
|
if (new_count > ACPI_MAX_REFERENCE_COUNT) { |
|
ACPI_WARNING((AE_INFO, |
|
"Large Reference Count (0x%X) in object %p, Type=0x%.2X Operation=%s", |
|
new_count, object, object->common.type, message)); |
|
} |
|
} |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_ut_update_object_reference |
|
* |
|
* PARAMETERS: object - Increment or decrement the ref count for |
|
* this object and all sub-objects |
|
* action - Either REF_INCREMENT or REF_DECREMENT |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Increment or decrement 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_operand_object *prev_object; |
|
union acpi_generic_state *state; |
|
u32 i; |
|
|
|
ACPI_FUNCTION_NAME(ut_update_object_reference); |
|
|
|
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 (AE_OK); |
|
} |
|
|
|
/* |
|
* All sub-objects must have their reference count updated |
|
* also. Different object types have different subobjects. |
|
*/ |
|
switch (object->common.type) { |
|
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) |
|
* Two lists, system and device notify handlers. |
|
*/ |
|
for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) { |
|
prev_object = |
|
object->common_notify.notify_list[i]; |
|
while (prev_object) { |
|
next_object = |
|
prev_object->notify.next[i]; |
|
acpi_ut_update_ref_count(prev_object, |
|
action); |
|
prev_object = next_object; |
|
} |
|
} |
|
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++) { |
|
/* |
|
* Null package elements are legal and can be simply |
|
* ignored. |
|
*/ |
|
next_object = object->package.elements[i]; |
|
if (!next_object) { |
|
continue; |
|
} |
|
|
|
switch (next_object->common.type) { |
|
case ACPI_TYPE_INTEGER: |
|
case ACPI_TYPE_STRING: |
|
case ACPI_TYPE_BUFFER: |
|
/* |
|
* For these very simple sub-objects, we can just |
|
* update the reference count here and continue. |
|
* Greatly increases performance of this operation. |
|
*/ |
|
acpi_ut_update_ref_count(next_object, |
|
action); |
|
break; |
|
|
|
default: |
|
/* |
|
* For complex sub-objects, push them onto the stack |
|
* for later processing (this eliminates recursion.) |
|
*/ |
|
status = |
|
acpi_ut_create_update_state_and_push |
|
(next_object, action, &state_list); |
|
if (ACPI_FAILURE(status)) { |
|
goto error_exit; |
|
} |
|
break; |
|
} |
|
} |
|
|
|
next_object = NULL; |
|
break; |
|
|
|
case ACPI_TYPE_BUFFER_FIELD: |
|
|
|
next_object = object->buffer_field.buffer_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_LOCAL_REGION_FIELD: |
|
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 (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 (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_NAME(ut_add_reference); |
|
|
|
/* Ensure that we have a valid object */ |
|
|
|
if (!acpi_ut_valid_internal_object(object)) { |
|
return; |
|
} |
|
|
|
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; |
|
} |
|
|
|
/******************************************************************************* |
|
* |
|
* 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_NAME(ut_remove_reference); |
|
|
|
/* |
|
* 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; |
|
} |
|
|
|
/* Ensure that we have a valid object */ |
|
|
|
if (!acpi_ut_valid_internal_object(object)) { |
|
return; |
|
} |
|
|
|
ACPI_DEBUG_PRINT_RAW((ACPI_DB_ALLOCATIONS, |
|
"%s: Obj %p Current Refs=%X [To Be Decremented]\n", |
|
ACPI_GET_FUNCTION_NAME, 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; |
|
}
|
|
|