Orange Pi5 kernel

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: nspredef - Validation of ACPI predefined methods and objects
 *
 * Copyright (C) 2000 - 2020, Intel Corp.
 *
 *****************************************************************************/
 
#define ACPI_CREATE_PREDEFINED_TABLE
 
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acpredef.h"
 
#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nspredef")
 
/*******************************************************************************
 *
 * This module validates predefined ACPI objects that appear in the namespace,
 * at the time they are evaluated (via acpi_evaluate_object). The purpose of this
 * validation is to detect problems with BIOS-exposed predefined ACPI objects
 * before the results are returned to the ACPI-related drivers.
 *
 * There are several areas that are validated:
 *
 *  1) The number of input arguments as defined by the method/object in the
 *     ASL is validated against the ACPI specification.
 *  2) The type of the return object (if any) is validated against the ACPI
 *     specification.
 *  3) For returned package objects, the count of package elements is
 *     validated, as well as the type of each package element. Nested
 *     packages are supported.
 *
 * For any problems found, a warning message is issued.
 *
 ******************************************************************************/
/* Local prototypes */
static acpi_status
acpi_ns_check_reference(struct acpi_evaluate_info *info,
<------><------><------>union acpi_operand_object *return_object);
 
static u32 acpi_ns_get_bitmapped_type(union acpi_operand_object *return_object);
 
/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_return_value
 *
 * PARAMETERS:  node            - Namespace node for the method/object
 *              info            - Method execution information block
 *              user_param_count - Number of parameters actually passed
 *              return_status   - Status from the object evaluation
 *              return_object_ptr - Pointer to the object returned from the
 *                                evaluation of a method or object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check the value returned from a predefined name.
 *
 ******************************************************************************/
 
acpi_status
acpi_ns_check_return_value(struct acpi_namespace_node *node,
<------><------><------>   struct acpi_evaluate_info *info,
<------><------><------>   u32 user_param_count,
<------><------><------>   acpi_status return_status,
<------><------><------>   union acpi_operand_object **return_object_ptr)
{
<------>acpi_status status;
<------>const union acpi_predefined_info *predefined;
 
<------>/* If not a predefined name, we cannot validate the return object */
 
<------>predefined = info->predefined;
<------>if (!predefined) {
<------><------>return (AE_OK);
<------>}
 
<------>/*
<------> * If the method failed or did not actually return an object, we cannot
<------> * validate the return object
<------> */
<------>if ((return_status != AE_OK) && (return_status != AE_CTRL_RETURN_VALUE)) {
<------><------>return (AE_OK);
<------>}
 
<------>/*
<------> * Return value validation and possible repair.
<------> *
<------> * 1) Don't perform return value validation/repair if this feature
<------> * has been disabled via a global option.
<------> *
<------> * 2) We have a return value, but if one wasn't expected, just exit,
<------> * this is not a problem. For example, if the "Implicit Return"
<------> * feature is enabled, methods will always return a value.
<------> *
<------> * 3) If the return value can be of any type, then we cannot perform
<------> * any validation, just exit.
<------> */
<------>if (acpi_gbl_disable_auto_repair ||
<------>    (!predefined->info.expected_btypes) ||
<------>    (predefined->info.expected_btypes == ACPI_RTYPE_ALL)) {
<------><------>return (AE_OK);
<------>}
 
<------>/*
<------> * Check that the type of the main return object is what is expected
<------> * for this predefined name
<------> */
<------>status = acpi_ns_check_object_type(info, return_object_ptr,
<------><------><------><------><------>   predefined->info.expected_btypes,
<------><------><------><------><------>   ACPI_NOT_PACKAGE_ELEMENT);
<------>if (ACPI_FAILURE(status)) {
<------><------>goto exit;
<------>}
 
<------>/*
<------> *
<------> * 4) If there is no return value and it is optional, just return
<------> * AE_OK (_WAK).
<------> */
<------>if (!(*return_object_ptr)) {
<------><------>goto exit;
<------>}
 
<------>/*
<------> * For returned Package objects, check the type of all sub-objects.
<------> * Note: Package may have been newly created by call above.
<------> */
<------>if ((*return_object_ptr)->common.type == ACPI_TYPE_PACKAGE) {
<------><------>info->parent_package = *return_object_ptr;
<------><------>status = acpi_ns_check_package(info, return_object_ptr);
<------><------>if (ACPI_FAILURE(status)) {
 
<------><------><------>/* We might be able to fix some errors */
 
<------><------><------>if ((status != AE_AML_OPERAND_TYPE) &&
<------><------><------>    (status != AE_AML_OPERAND_VALUE)) {
<------><------><------><------>goto exit;
<------><------><------>}
<------><------>}
<------>}
 
<------>/*
<------> * The return object was OK, or it was successfully repaired above.
<------> * Now make some additional checks such as verifying that package
<------> * objects are sorted correctly (if required) or buffer objects have
<------> * the correct data width (bytes vs. dwords). These repairs are
<------> * performed on a per-name basis, i.e., the code is specific to
<------> * particular predefined names.
<------> */
<------>status = acpi_ns_complex_repairs(info, node, status, return_object_ptr);
 
exit:
<------>/*
<------> * If the object validation failed or if we successfully repaired one
<------> * or more objects, mark the parent node to suppress further warning
<------> * messages during the next evaluation of the same method/object.
<------> */
<------>if (ACPI_FAILURE(status) || (info->return_flags & ACPI_OBJECT_REPAIRED)) {
<------><------>node->flags |= ANOBJ_EVALUATED;
<------>}
 
<------>return (status);
}
 
/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_object_type
 *
 * PARAMETERS:  info            - Method execution information block
 *              return_object_ptr - Pointer to the object returned from the
 *                                evaluation of a method or object
 *              expected_btypes - Bitmap of expected return type(s)
 *              package_index   - Index of object within parent package (if
 *                                applicable - ACPI_NOT_PACKAGE_ELEMENT
 *                                otherwise)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check the type of the return object against the expected object
 *              type(s). Use of Btype allows multiple expected object types.
 *
 ******************************************************************************/
 
acpi_status
acpi_ns_check_object_type(struct acpi_evaluate_info *info,
<------><------><------>  union acpi_operand_object **return_object_ptr,
<------><------><------>  u32 expected_btypes, u32 package_index)
{
<------>union acpi_operand_object *return_object = *return_object_ptr;
<------>acpi_status status = AE_OK;
<------>char type_buffer[96];	/* Room for 10 types */
 
<------>/* A Namespace node should not get here, but make sure */
 
<------>if (return_object &&
<------>    ACPI_GET_DESCRIPTOR_TYPE(return_object) == ACPI_DESC_TYPE_NAMED) {
<------><------>ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
<------><------><------><------>      info->node_flags,
<------><------><------><------>      "Invalid return type - Found a Namespace node [%4.4s] type %s",
<------><------><------><------>      return_object->node.name.ascii,
<------><------><------><------>      acpi_ut_get_type_name(return_object->node.
<------><------><------><------><------><------><------>    type)));
<------><------>return (AE_AML_OPERAND_TYPE);
<------>}
 
<------>/*
<------> * Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type.
<------> * The bitmapped type allows multiple possible return types.
<------> *
<------> * Note, the cases below must handle all of the possible types returned
<------> * from all of the predefined names (including elements of returned
<------> * packages)
<------> */
<------>info->return_btype = acpi_ns_get_bitmapped_type(return_object);
<------>if (info->return_btype == ACPI_RTYPE_ANY) {
 
<------><------>/* Not one of the supported objects, must be incorrect */
<------><------>goto type_error_exit;
<------>}
 
<------>/* For reference objects, check that the reference type is correct */
 
<------>if ((info->return_btype & expected_btypes) == ACPI_RTYPE_REFERENCE) {
<------><------>status = acpi_ns_check_reference(info, return_object);
<------><------>return (status);
<------>}
 
<------>/* Attempt simple repair of the returned object if necessary */
 
<------>status = acpi_ns_simple_repair(info, expected_btypes,
<------><------><------><------>       package_index, return_object_ptr);
<------>if (ACPI_SUCCESS(status)) {
<------><------>return (AE_OK);	/* Successful repair */
<------>}
 
type_error_exit:
 
<------>/* Create a string with all expected types for this predefined object */
 
<------>acpi_ut_get_expected_return_types(type_buffer, expected_btypes);
 
<------>if (!return_object) {
<------><------>ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
<------><------><------><------>      info->node_flags,
<------><------><------><------>      "Expected return object of type %s",
<------><------><------><------>      type_buffer));
<------>} else if (package_index == ACPI_NOT_PACKAGE_ELEMENT) {
<------><------>ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
<------><------><------><------>      info->node_flags,
<------><------><------><------>      "Return type mismatch - found %s, expected %s",
<------><------><------><------>      acpi_ut_get_object_type_name
<------><------><------><------>      (return_object), type_buffer));
<------>} else {
<------><------>ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
<------><------><------><------>      info->node_flags,
<------><------><------><------>      "Return Package type mismatch at index %u - "
<------><------><------><------>      "found %s, expected %s", package_index,
<------><------><------><------>      acpi_ut_get_object_type_name
<------><------><------><------>      (return_object), type_buffer));
<------>}
 
<------>return (AE_AML_OPERAND_TYPE);
}
 
/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_reference
 *
 * PARAMETERS:  info            - Method execution information block
 *              return_object   - Object returned from the evaluation of a
 *                                method or object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check a returned reference object for the correct reference
 *              type. The only reference type that can be returned from a
 *              predefined method is a named reference. All others are invalid.
 *
 ******************************************************************************/
 
static acpi_status
acpi_ns_check_reference(struct acpi_evaluate_info *info,
<------><------><------>union acpi_operand_object *return_object)
{
 
<------>/*
<------> * Check the reference object for the correct reference type (opcode).
<------> * The only type of reference that can be converted to a union acpi_object is
<------> * a reference to a named object (reference class: NAME)
<------> */
<------>if (return_object->reference.class == ACPI_REFCLASS_NAME) {
<------><------>return (AE_OK);
<------>}
 
<------>ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
<------><------><------>      "Return type mismatch - unexpected reference object type [%s] %2.2X",
<------><------><------>      acpi_ut_get_reference_name(return_object),
<------><------><------>      return_object->reference.class));
 
<------>return (AE_AML_OPERAND_TYPE);
}
 
/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_bitmapped_type
 *
 * PARAMETERS:  return_object   - Object returned from method/obj evaluation
 *
 * RETURN:      Object return type. ACPI_RTYPE_ANY indicates that the object
 *              type is not supported. ACPI_RTYPE_NONE indicates that no
 *              object was returned (return_object is NULL).
 *
 * DESCRIPTION: Convert object type into a bitmapped object return type.
 *
 ******************************************************************************/
 
static u32 acpi_ns_get_bitmapped_type(union acpi_operand_object *return_object)
{
<------>u32 return_btype;
 
<------>if (!return_object) {
<------><------>return (ACPI_RTYPE_NONE);
<------>}
 
<------>/* Map acpi_object_type to internal bitmapped type */
 
<------>switch (return_object->common.type) {
<------>case ACPI_TYPE_INTEGER:
 
<------><------>return_btype = ACPI_RTYPE_INTEGER;
<------><------>break;
 
<------>case ACPI_TYPE_BUFFER:
 
<------><------>return_btype = ACPI_RTYPE_BUFFER;
<------><------>break;
 
<------>case ACPI_TYPE_STRING:
 
<------><------>return_btype = ACPI_RTYPE_STRING;
<------><------>break;
 
<------>case ACPI_TYPE_PACKAGE:
 
<------><------>return_btype = ACPI_RTYPE_PACKAGE;
<------><------>break;
 
<------>case ACPI_TYPE_LOCAL_REFERENCE:
 
<------><------>return_btype = ACPI_RTYPE_REFERENCE;
<------><------>break;
 
<------>default:
 
<------><------>/* Not one of the supported objects, must be incorrect */
 
<------><------>return_btype = ACPI_RTYPE_ANY;
<------><------>break;
<------>}
 
<------>return (return_btype);
}