| // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
| /****************************************************************************** |
| * |
| * Module Name: utobject - ACPI object create/delete/size/cache routines |
| * |
| * Copyright (C) 2000 - 2020, Intel Corp. |
| * |
| *****************************************************************************/ |
| |
| #include <acpi/acpi.h> |
| #include <linux/kmemleak.h> |
| #include "accommon.h" |
| #include "acnamesp.h" |
| |
| #define _COMPONENT ACPI_UTILITIES |
| ACPI_MODULE_NAME("utobject") |
| |
| /* Local prototypes */ |
| static acpi_status |
| acpi_ut_get_simple_object_size(union acpi_operand_object *obj, |
| acpi_size *obj_length); |
| |
| static acpi_status |
| acpi_ut_get_package_object_size(union acpi_operand_object *obj, |
| acpi_size *obj_length); |
| |
| static acpi_status |
| acpi_ut_get_element_length(u8 object_type, |
| union acpi_operand_object *source_object, |
| union acpi_generic_state *state, void *context); |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_create_internal_object_dbg |
| * |
| * PARAMETERS: module_name - Source file name of caller |
| * line_number - Line number of caller |
| * component_id - Component type of caller |
| * type - ACPI Type of the new object |
| * |
| * RETURN: A new internal object, null on failure |
| * |
| * DESCRIPTION: Create and initialize a new internal object. |
| * |
| * NOTE: We always allocate the worst-case object descriptor because |
| * these objects are cached, and we want them to be |
| * one-size-satisifies-any-request. This in itself may not be |
| * the most memory efficient, but the efficiency of the object |
| * cache should more than make up for this! |
| * |
| ******************************************************************************/ |
| |
| union acpi_operand_object *acpi_ut_create_internal_object_dbg(const char |
| *module_name, |
| u32 line_number, |
| u32 component_id, |
| acpi_object_type |
| type) |
| { |
| union acpi_operand_object *object; |
| union acpi_operand_object *second_object; |
| |
| ACPI_FUNCTION_TRACE_STR(ut_create_internal_object_dbg, |
| acpi_ut_get_type_name(type)); |
| |
| /* Allocate the raw object descriptor */ |
| |
| object = |
| acpi_ut_allocate_object_desc_dbg(module_name, line_number, |
| component_id); |
| if (!object) { |
| return_PTR(NULL); |
| } |
| kmemleak_not_leak(object); |
| |
| switch (type) { |
| case ACPI_TYPE_REGION: |
| case ACPI_TYPE_BUFFER_FIELD: |
| case ACPI_TYPE_LOCAL_BANK_FIELD: |
| |
| /* These types require a secondary object */ |
| |
| second_object = |
| acpi_ut_allocate_object_desc_dbg(module_name, line_number, |
| component_id); |
| if (!second_object) { |
| acpi_ut_delete_object_desc(object); |
| return_PTR(NULL); |
| } |
| |
| second_object->common.type = ACPI_TYPE_LOCAL_EXTRA; |
| second_object->common.reference_count = 1; |
| |
| /* Link the second object to the first */ |
| |
| object->common.next_object = second_object; |
| break; |
| |
| default: |
| |
| /* All others have no secondary object */ |
| break; |
| } |
| |
| /* Save the object type in the object descriptor */ |
| |
| object->common.type = (u8) type; |
| |
| /* Init the reference count */ |
| |
| object->common.reference_count = 1; |
| |
| /* Any per-type initialization should go here */ |
| |
| return_PTR(object); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_create_package_object |
| * |
| * PARAMETERS: count - Number of package elements |
| * |
| * RETURN: Pointer to a new Package object, null on failure |
| * |
| * DESCRIPTION: Create a fully initialized package object |
| * |
| ******************************************************************************/ |
| |
| union acpi_operand_object *acpi_ut_create_package_object(u32 count) |
| { |
| union acpi_operand_object *package_desc; |
| union acpi_operand_object **package_elements; |
| |
| ACPI_FUNCTION_TRACE_U32(ut_create_package_object, count); |
| |
| /* Create a new Package object */ |
| |
| package_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE); |
| if (!package_desc) { |
| return_PTR(NULL); |
| } |
| |
| /* |
| * Create the element array. Count+1 allows the array to be null |
| * terminated. |
| */ |
| package_elements = ACPI_ALLOCATE_ZEROED(((acpi_size)count + |
| 1) * sizeof(void *)); |
| if (!package_elements) { |
| ACPI_FREE(package_desc); |
| return_PTR(NULL); |
| } |
| |
| package_desc->package.count = count; |
| package_desc->package.elements = package_elements; |
| return_PTR(package_desc); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_create_integer_object |
| * |
| * PARAMETERS: initial_value - Initial value for the integer |
| * |
| * RETURN: Pointer to a new Integer object, null on failure |
| * |
| * DESCRIPTION: Create an initialized integer object |
| * |
| ******************************************************************************/ |
| |
| union acpi_operand_object *acpi_ut_create_integer_object(u64 initial_value) |
| { |
| union acpi_operand_object *integer_desc; |
| |
| ACPI_FUNCTION_TRACE(ut_create_integer_object); |
| |
| /* Create and initialize a new integer object */ |
| |
| integer_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER); |
| if (!integer_desc) { |
| return_PTR(NULL); |
| } |
| |
| integer_desc->integer.value = initial_value; |
| return_PTR(integer_desc); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_create_buffer_object |
| * |
| * PARAMETERS: buffer_size - Size of buffer to be created |
| * |
| * RETURN: Pointer to a new Buffer object, null on failure |
| * |
| * DESCRIPTION: Create a fully initialized buffer object |
| * |
| ******************************************************************************/ |
| |
| union acpi_operand_object *acpi_ut_create_buffer_object(acpi_size buffer_size) |
| { |
| union acpi_operand_object *buffer_desc; |
| u8 *buffer = NULL; |
| |
| ACPI_FUNCTION_TRACE_U32(ut_create_buffer_object, buffer_size); |
| |
| /* Create a new Buffer object */ |
| |
| buffer_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER); |
| if (!buffer_desc) { |
| return_PTR(NULL); |
| } |
| |
| /* Create an actual buffer only if size > 0 */ |
| |
| if (buffer_size > 0) { |
| |
| /* Allocate the actual buffer */ |
| |
| buffer = ACPI_ALLOCATE_ZEROED(buffer_size); |
| if (!buffer) { |
| ACPI_ERROR((AE_INFO, "Could not allocate size %u", |
| (u32)buffer_size)); |
| |
| acpi_ut_remove_reference(buffer_desc); |
| return_PTR(NULL); |
| } |
| } |
| |
| /* Complete buffer object initialization */ |
| |
| buffer_desc->buffer.flags |= AOPOBJ_DATA_VALID; |
| buffer_desc->buffer.pointer = buffer; |
| buffer_desc->buffer.length = (u32) buffer_size; |
| |
| /* Return the new buffer descriptor */ |
| |
| return_PTR(buffer_desc); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_create_string_object |
| * |
| * PARAMETERS: string_size - Size of string to be created. Does not |
| * include NULL terminator, this is added |
| * automatically. |
| * |
| * RETURN: Pointer to a new String object |
| * |
| * DESCRIPTION: Create a fully initialized string object |
| * |
| ******************************************************************************/ |
| |
| union acpi_operand_object *acpi_ut_create_string_object(acpi_size string_size) |
| { |
| union acpi_operand_object *string_desc; |
| char *string; |
| |
| ACPI_FUNCTION_TRACE_U32(ut_create_string_object, string_size); |
| |
| /* Create a new String object */ |
| |
| string_desc = acpi_ut_create_internal_object(ACPI_TYPE_STRING); |
| if (!string_desc) { |
| return_PTR(NULL); |
| } |
| |
| /* |
| * Allocate the actual string buffer -- (Size + 1) for NULL terminator. |
| * NOTE: Zero-length strings are NULL terminated |
| */ |
| string = ACPI_ALLOCATE_ZEROED(string_size + 1); |
| if (!string) { |
| ACPI_ERROR((AE_INFO, "Could not allocate size %u", |
| (u32)string_size)); |
| |
| acpi_ut_remove_reference(string_desc); |
| return_PTR(NULL); |
| } |
| |
| /* Complete string object initialization */ |
| |
| string_desc->string.pointer = string; |
| string_desc->string.length = (u32) string_size; |
| |
| /* Return the new string descriptor */ |
| |
| return_PTR(string_desc); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_valid_internal_object |
| * |
| * PARAMETERS: object - Object to be validated |
| * |
| * RETURN: TRUE if object is valid, FALSE otherwise |
| * |
| * DESCRIPTION: Validate a pointer to be of type union acpi_operand_object |
| * |
| ******************************************************************************/ |
| |
| u8 acpi_ut_valid_internal_object(void *object) |
| { |
| |
| ACPI_FUNCTION_NAME(ut_valid_internal_object); |
| |
| /* Check for a null pointer */ |
| |
| if (!object) { |
| ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "**** Null Object Ptr\n")); |
| return (FALSE); |
| } |
| |
| /* Check the descriptor type field */ |
| |
| switch (ACPI_GET_DESCRIPTOR_TYPE(object)) { |
| case ACPI_DESC_TYPE_OPERAND: |
| |
| /* The object appears to be a valid union acpi_operand_object */ |
| |
| return (TRUE); |
| |
| default: |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
| "%p is not an ACPI operand obj [%s]\n", |
| object, acpi_ut_get_descriptor_name(object))); |
| break; |
| } |
| |
| return (FALSE); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_allocate_object_desc_dbg |
| * |
| * PARAMETERS: module_name - Caller's module name (for error output) |
| * line_number - Caller's line number (for error output) |
| * component_id - Caller's component ID (for error output) |
| * |
| * RETURN: Pointer to newly allocated object descriptor. Null on error |
| * |
| * DESCRIPTION: Allocate a new object descriptor. Gracefully handle |
| * error conditions. |
| * |
| ******************************************************************************/ |
| |
| void *acpi_ut_allocate_object_desc_dbg(const char *module_name, |
| u32 line_number, u32 component_id) |
| { |
| union acpi_operand_object *object; |
| |
| ACPI_FUNCTION_TRACE(ut_allocate_object_desc_dbg); |
| |
| object = acpi_os_acquire_object(acpi_gbl_operand_cache); |
| if (!object) { |
| ACPI_ERROR((module_name, line_number, |
| "Could not allocate an object descriptor")); |
| |
| return_PTR(NULL); |
| } |
| |
| /* Mark the descriptor type */ |
| |
| ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_OPERAND); |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "%p Size %X\n", |
| object, (u32) sizeof(union acpi_operand_object))); |
| |
| return_PTR(object); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_delete_object_desc |
| * |
| * PARAMETERS: object - An Acpi internal object to be deleted |
| * |
| * RETURN: None. |
| * |
| * DESCRIPTION: Free an ACPI object descriptor or add it to the object cache |
| * |
| ******************************************************************************/ |
| |
| void acpi_ut_delete_object_desc(union acpi_operand_object *object) |
| { |
| ACPI_FUNCTION_TRACE_PTR(ut_delete_object_desc, object); |
| |
| /* Object must be of type union acpi_operand_object */ |
| |
| if (ACPI_GET_DESCRIPTOR_TYPE(object) != ACPI_DESC_TYPE_OPERAND) { |
| ACPI_ERROR((AE_INFO, |
| "%p is not an ACPI Operand object [%s]", object, |
| acpi_ut_get_descriptor_name(object))); |
| return_VOID; |
| } |
| |
| (void)acpi_os_release_object(acpi_gbl_operand_cache, object); |
| return_VOID; |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_get_simple_object_size |
| * |
| * PARAMETERS: internal_object - An ACPI operand object |
| * obj_length - Where the length is returned |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: This function is called to determine the space required to |
| * contain a simple object for return to an external user. |
| * |
| * The length includes the object structure plus any additional |
| * needed space. |
| * |
| ******************************************************************************/ |
| |
| static acpi_status |
| acpi_ut_get_simple_object_size(union acpi_operand_object *internal_object, |
| acpi_size *obj_length) |
| { |
| acpi_size length; |
| acpi_size size; |
| acpi_status status = AE_OK; |
| |
| ACPI_FUNCTION_TRACE_PTR(ut_get_simple_object_size, internal_object); |
| |
| /* Start with the length of the (external) Acpi object */ |
| |
| length = sizeof(union acpi_object); |
| |
| /* A NULL object is allowed, can be a legal uninitialized package element */ |
| |
| if (!internal_object) { |
| /* |
| * Object is NULL, just return the length of union acpi_object |
| * (A NULL union acpi_object is an object of all zeroes.) |
| */ |
| *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length); |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /* A Namespace Node should never appear here */ |
| |
| if (ACPI_GET_DESCRIPTOR_TYPE(internal_object) == ACPI_DESC_TYPE_NAMED) { |
| |
| /* A namespace node should never get here */ |
| |
| ACPI_ERROR((AE_INFO, |
| "Received a namespace node [%4.4s] " |
| "where an operand object is required", |
| ACPI_CAST_PTR(struct acpi_namespace_node, |
| internal_object)->name.ascii)); |
| return_ACPI_STATUS(AE_AML_INTERNAL); |
| } |
| |
| /* |
| * The final length depends on the object type |
| * Strings and Buffers are packed right up against the parent object and |
| * must be accessed bytewise or there may be alignment problems on |
| * certain processors |
| */ |
| switch (internal_object->common.type) { |
| case ACPI_TYPE_STRING: |
| |
| length += (acpi_size)internal_object->string.length + 1; |
| break; |
| |
| case ACPI_TYPE_BUFFER: |
| |
| length += (acpi_size)internal_object->buffer.length; |
| break; |
| |
| case ACPI_TYPE_INTEGER: |
| case ACPI_TYPE_PROCESSOR: |
| case ACPI_TYPE_POWER: |
| |
| /* No extra data for these types */ |
| |
| break; |
| |
| case ACPI_TYPE_LOCAL_REFERENCE: |
| |
| switch (internal_object->reference.class) { |
| case ACPI_REFCLASS_NAME: |
| /* |
| * Get the actual length of the full pathname to this object. |
| * The reference will be converted to the pathname to the object |
| */ |
| size = |
| acpi_ns_get_pathname_length(internal_object-> |
| reference.node); |
| if (!size) { |
| return_ACPI_STATUS(AE_BAD_PARAMETER); |
| } |
| |
| length += ACPI_ROUND_UP_TO_NATIVE_WORD(size); |
| break; |
| |
| default: |
| /* |
| * No other reference opcodes are supported. |
| * Notably, Locals and Args are not supported, but this may be |
| * required eventually. |
| */ |
| ACPI_ERROR((AE_INFO, |
| "Cannot convert to external object - " |
| "unsupported Reference Class [%s] 0x%X in object %p", |
| acpi_ut_get_reference_name(internal_object), |
| internal_object->reference.class, |
| internal_object)); |
| status = AE_TYPE; |
| break; |
| } |
| break; |
| |
| default: |
| |
| ACPI_ERROR((AE_INFO, "Cannot convert to external object - " |
| "unsupported type [%s] 0x%X in object %p", |
| acpi_ut_get_object_type_name(internal_object), |
| internal_object->common.type, internal_object)); |
| status = AE_TYPE; |
| break; |
| } |
| |
| /* |
| * Account for the space required by the object rounded up to the next |
| * multiple of the machine word size. This keeps each object aligned |
| * on a machine word boundary. (preventing alignment faults on some |
| * machines.) |
| */ |
| *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length); |
| return_ACPI_STATUS(status); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_get_element_length |
| * |
| * PARAMETERS: acpi_pkg_callback |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Get the length of one package element. |
| * |
| ******************************************************************************/ |
| |
| static acpi_status |
| acpi_ut_get_element_length(u8 object_type, |
| union acpi_operand_object *source_object, |
| union acpi_generic_state *state, void *context) |
| { |
| acpi_status status = AE_OK; |
| struct acpi_pkg_info *info = (struct acpi_pkg_info *)context; |
| acpi_size object_space; |
| |
| switch (object_type) { |
| case ACPI_COPY_TYPE_SIMPLE: |
| /* |
| * Simple object - just get the size (Null object/entry is handled |
| * here also) and sum it into the running package length |
| */ |
| status = |
| acpi_ut_get_simple_object_size(source_object, |
| &object_space); |
| if (ACPI_FAILURE(status)) { |
| return (status); |
| } |
| |
| info->length += object_space; |
| break; |
| |
| case ACPI_COPY_TYPE_PACKAGE: |
| |
| /* Package object - nothing much to do here, let the walk handle it */ |
| |
| info->num_packages++; |
| state->pkg.this_target_obj = NULL; |
| break; |
| |
| default: |
| |
| /* No other types allowed */ |
| |
| return (AE_BAD_PARAMETER); |
| } |
| |
| return (status); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_get_package_object_size |
| * |
| * PARAMETERS: internal_object - An ACPI internal object |
| * obj_length - Where the length is returned |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: This function is called to determine the space required to |
| * contain a package object for return to an external user. |
| * |
| * This is moderately complex since a package contains other |
| * objects including packages. |
| * |
| ******************************************************************************/ |
| |
| static acpi_status |
| acpi_ut_get_package_object_size(union acpi_operand_object *internal_object, |
| acpi_size *obj_length) |
| { |
| acpi_status status; |
| struct acpi_pkg_info info; |
| |
| ACPI_FUNCTION_TRACE_PTR(ut_get_package_object_size, internal_object); |
| |
| info.length = 0; |
| info.object_space = 0; |
| info.num_packages = 1; |
| |
| status = |
| acpi_ut_walk_package_tree(internal_object, NULL, |
| acpi_ut_get_element_length, &info); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| |
| /* |
| * We have handled all of the objects in all levels of the package. |
| * just add the length of the package objects themselves. |
| * Round up to the next machine word. |
| */ |
| info.length += |
| ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object)) * |
| (acpi_size)info.num_packages; |
| |
| /* Return the total package length */ |
| |
| *obj_length = info.length; |
| return_ACPI_STATUS(status); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_get_object_size |
| * |
| * PARAMETERS: internal_object - An ACPI internal object |
| * obj_length - Where the length will be returned |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: This function is called to determine the space required to |
| * contain an object for return to an API user. |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_ut_get_object_size(union acpi_operand_object *internal_object, |
| acpi_size *obj_length) |
| { |
| acpi_status status; |
| |
| ACPI_FUNCTION_ENTRY(); |
| |
| if ((ACPI_GET_DESCRIPTOR_TYPE(internal_object) == |
| ACPI_DESC_TYPE_OPERAND) && |
| (internal_object->common.type == ACPI_TYPE_PACKAGE)) { |
| status = |
| acpi_ut_get_package_object_size(internal_object, |
| obj_length); |
| } else { |
| status = |
| acpi_ut_get_simple_object_size(internal_object, obj_length); |
| } |
| |
| return (status); |
| } |