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Release 4.11 drivers/acpi/acpica/nspredef.c

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

/*
 * Copyright (C) 2000 - 2017, 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); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore23992.64%1785.00%
Lv Zheng197.36%315.00%
Total258100.00%20100.00%

/******************************************************************************* * * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore281100.00%10100.00%
Total281100.00%10100.00%

/******************************************************************************* * * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore6698.51%375.00%
Masahiro Yamada11.49%125.00%
Total67100.00%4100.00%

/******************************************************************************* * * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore89100.00%1100.00%
Total89100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Robert Moore72796.80%2379.31%
Lv Zheng202.66%413.79%
Len Brown30.40%13.45%
Masahiro Yamada10.13%13.45%
Total751100.00%29100.00%
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