Merge branch 'r6040-next'

[linux/fpc-iii.git] / drivers / acpi / acpica / nspredef.c

/******************************************************************************
 *
 * Module Name: nspredef - Validation of ACPI predefined methods and objects
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2016, 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.
 */

#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 an 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);
}