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Release 4.11 drivers/acpi/acpica/nsrepair.c

/******************************************************************************
 *
 * Module Name: nsrepair - Repair for objects returned by predefined methods
 *
 *****************************************************************************/

/*
 * 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.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acinterp.h"
#include "acpredef.h"
#include "amlresrc.h"


#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsrepair")

/*******************************************************************************
 *
 * This module attempts to repair or convert objects returned by the
 * predefined methods to an object type that is expected, as per the ACPI
 * specification. The need for this code is dictated by the many machines that
 * return incorrect types for the standard predefined methods. Performing these
 * conversions here, in one place, eliminates the need for individual ACPI
 * device drivers to do the same. Note: Most of these conversions are different
 * than the internal object conversion routines used for implicit object
 * conversion.
 *
 * The following conversions can be performed as necessary:
 *
 * Integer -> String
 * Integer -> Buffer
 * String  -> Integer
 * String  -> Buffer
 * Buffer  -> Integer
 * Buffer  -> String
 * Buffer  -> Package of Integers
 * Package -> Package of one Package
 *
 * Additional conversions that are available:
 *  Convert a null return or zero return value to an end_tag descriptor
 *  Convert an ASCII string to a Unicode buffer
 *
 * An incorrect standalone object is wrapped with required outer package
 *
 * Additional possible repairs:
 * Required package elements that are NULL replaced by Integer/String/Buffer
 *
 ******************************************************************************/
/* Local prototypes */
static const struct acpi_simple_repair_info *acpi_ns_match_simple_repair(struct
									 acpi_namespace_node
									 *node,
									 u32
									 return_btype,
									 u32
									 package_index);

/*
 * Special but simple repairs for some names.
 *
 * 2nd argument: Unexpected types that can be repaired
 */

static const struct acpi_simple_repair_info acpi_object_repair_info[] = {
	/* Resource descriptor conversions */

	{"_CRS",
	 ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER |
	 ACPI_RTYPE_NONE,
	 ACPI_NOT_PACKAGE_ELEMENT,
	 acpi_ns_convert_to_resource},
	{"_DMA",
	 ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER |
	 ACPI_RTYPE_NONE,
	 ACPI_NOT_PACKAGE_ELEMENT,
	 acpi_ns_convert_to_resource},
	{"_PRS",
	 ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER |
	 ACPI_RTYPE_NONE,
	 ACPI_NOT_PACKAGE_ELEMENT,
	 acpi_ns_convert_to_resource},

	/* Object reference conversions */

	{"_DEP", ACPI_RTYPE_STRING, ACPI_ALL_PACKAGE_ELEMENTS,
	 acpi_ns_convert_to_reference},

	/* Unicode conversions */

	{"_MLS", ACPI_RTYPE_STRING, 1,
	 acpi_ns_convert_to_unicode},
	{"_STR", ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER,
	 ACPI_NOT_PACKAGE_ELEMENT,
	 acpi_ns_convert_to_unicode},
	{{0, 0, 0, 0}, 0, 0, NULL}	/* Table terminator */
};

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_simple_repair
 *
 * PARAMETERS:  info                - Method execution information block
 *              expected_btypes     - Object types expected
 *              package_index       - Index of object within parent package (if
 *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
 *                                    otherwise)
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if repair was successful.
 *
 * DESCRIPTION: Attempt to repair/convert a return object of a type that was
 *              not expected.
 *
 ******************************************************************************/


acpi_status acpi_ns_simple_repair(struct acpi_evaluate_info *info, u32 expected_btypes, u32 package_index, union acpi_operand_object **return_object_ptr) { union acpi_operand_object *return_object = *return_object_ptr; union acpi_operand_object *new_object = NULL; acpi_status status; const struct acpi_simple_repair_info *predefined; ACPI_FUNCTION_NAME(ns_simple_repair); /* * Special repairs for certain names that are in the repair table. * Check if this name is in the list of repairable names. */ predefined = acpi_ns_match_simple_repair(info->node, info->return_btype, package_index); if (predefined) { if (!return_object) { ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, ACPI_WARN_ALWAYS, "Missing expected return value")); } status = predefined->object_converter(info->node, return_object, &new_object); if (ACPI_FAILURE(status)) { /* A fatal error occurred during a conversion */ ACPI_EXCEPTION((AE_INFO, status, "During return object analysis")); return (status); } if (new_object) { goto object_repaired; } } /* * Do not perform simple object repair unless the return type is not * expected. */ if (info->return_btype & expected_btypes) { return (AE_OK); } /* * At this point, we know that the type of the returned object was not * one of the expected types for this predefined name. Attempt to * repair the object by converting it to one of the expected object * types for this predefined name. */ /* * If there is no return value, check if we require a return value for * this predefined name. Either one return value is expected, or none, * for both methods and other objects. * * Try to fix if there was no return object. Warning if failed to fix. */ if (!return_object) { if (expected_btypes && (!(expected_btypes & ACPI_RTYPE_NONE))) { if (package_index != ACPI_NOT_PACKAGE_ELEMENT) { ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, ACPI_WARN_ALWAYS, "Found unexpected NULL package element")); status = acpi_ns_repair_null_element(info, expected_btypes, package_index, return_object_ptr); if (ACPI_SUCCESS(status)) { return (AE_OK); /* Repair was successful */ } } else { ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, ACPI_WARN_ALWAYS, "Missing expected return value")); } return (AE_AML_NO_RETURN_VALUE); } } if (expected_btypes & ACPI_RTYPE_INTEGER) { status = acpi_ns_convert_to_integer(return_object, &new_object); if (ACPI_SUCCESS(status)) { goto object_repaired; } } if (expected_btypes & ACPI_RTYPE_STRING) { status = acpi_ns_convert_to_string(return_object, &new_object); if (ACPI_SUCCESS(status)) { goto object_repaired; } } if (expected_btypes & ACPI_RTYPE_BUFFER) { status = acpi_ns_convert_to_buffer(return_object, &new_object); if (ACPI_SUCCESS(status)) { goto object_repaired; } } if (expected_btypes & ACPI_RTYPE_PACKAGE) { /* * A package is expected. We will wrap the existing object with a * new package object. It is often the case that if a variable-length * package is required, but there is only a single object needed, the * BIOS will return that object instead of wrapping it with a Package * object. Note: after the wrapping, the package will be validated * for correct contents (expected object type or types). */ status = acpi_ns_wrap_with_package(info, return_object, &new_object); if (ACPI_SUCCESS(status)) { /* * The original object just had its reference count * incremented for being inserted into the new package. */ *return_object_ptr = new_object; /* New Package object */ info->return_flags |= ACPI_OBJECT_REPAIRED; return (AE_OK); } } /* We cannot repair this object */ return (AE_AML_OPERAND_TYPE); object_repaired: /* Object was successfully repaired */ if (package_index != ACPI_NOT_PACKAGE_ELEMENT) { /* * The original object is a package element. We need to * decrement the reference count of the original object, * for removing it from the package. * * However, if the original object was just wrapped with a * package object as part of the repair, we don't need to * change the reference count. */ if (!(info->return_flags & ACPI_OBJECT_WRAPPED)) { new_object->common.reference_count = return_object->common.reference_count; if (return_object->common.reference_count > 1) { return_object->common.reference_count--; } } ACPI_DEBUG_PRINT((ACPI_DB_REPAIR, "%s: Converted %s to expected %s at Package index %u\n", info->full_pathname, acpi_ut_get_object_type_name(return_object), acpi_ut_get_object_type_name(new_object), package_index)); } else { ACPI_DEBUG_PRINT((ACPI_DB_REPAIR, "%s: Converted %s to expected %s\n", info->full_pathname, acpi_ut_get_object_type_name(return_object), acpi_ut_get_object_type_name(new_object))); } /* Delete old object, install the new return object */ acpi_ut_remove_reference(return_object); *return_object_ptr = new_object; info->return_flags |= ACPI_OBJECT_REPAIRED; return (AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore44683.68%770.00%
Lv Zheng5911.07%220.00%
Lin Ming285.25%110.00%
Total533100.00%10100.00%

/****************************************************************************** * * FUNCTION: acpi_ns_match_simple_repair * * PARAMETERS: node - Namespace node for the method/object * return_btype - Object type that was returned * package_index - Index of object within parent package (if * applicable - ACPI_NOT_PACKAGE_ELEMENT * otherwise) * * RETURN: Pointer to entry in repair table. NULL indicates not found. * * DESCRIPTION: Check an object name against the repairable object list. * *****************************************************************************/
static const struct acpi_simple_repair_info *acpi_ns_match_simple_repair(struct acpi_namespace_node *node, u32 return_btype, u32 package_index) { const struct acpi_simple_repair_info *this_name; /* Search info table for a repairable predefined method/object name */ this_name = acpi_object_repair_info; while (this_name->object_converter) { if (ACPI_COMPARE_NAME(node->name.ascii, this_name->name)) { /* Check if we can actually repair this name/type combination */ if ((return_btype & this_name->unexpected_btypes) && (this_name->package_index == ACPI_ALL_PACKAGE_ELEMENTS || package_index == this_name->package_index)) { return (this_name); } return (NULL); } this_name++; } return (NULL); /* Name was not found in the repair table */ }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore9694.12%150.00%
Lv Zheng65.88%150.00%
Total102100.00%2100.00%

/******************************************************************************* * * FUNCTION: acpi_ns_repair_null_element * * PARAMETERS: info - Method execution information block * expected_btypes - Object types expected * package_index - Index of object within parent package (if * applicable - ACPI_NOT_PACKAGE_ELEMENT * otherwise) * return_object_ptr - Pointer to the object returned from the * evaluation of a method or object * * RETURN: Status. AE_OK if repair was successful. * * DESCRIPTION: Attempt to repair a NULL element of a returned Package object. * ******************************************************************************/
acpi_status acpi_ns_repair_null_element(struct acpi_evaluate_info *info, u32 expected_btypes, u32 package_index, union acpi_operand_object **return_object_ptr) { union acpi_operand_object *return_object = *return_object_ptr; union acpi_operand_object *new_object; ACPI_FUNCTION_NAME(ns_repair_null_element); /* No repair needed if return object is non-NULL */ if (return_object) { return (AE_OK); } /* * Attempt to repair a NULL element of a Package object. This applies to * predefined names that return a fixed-length package and each element * is required. It does not apply to variable-length packages where NULL * elements are allowed, especially at the end of the package. */ if (expected_btypes & ACPI_RTYPE_INTEGER) { /* Need an integer - create a zero-value integer */ new_object = acpi_ut_create_integer_object((u64)0); } else if (expected_btypes & ACPI_RTYPE_STRING) { /* Need a string - create a NULL string */ new_object = acpi_ut_create_string_object(0); } else if (expected_btypes & ACPI_RTYPE_BUFFER) { /* Need a buffer - create a zero-length buffer */ new_object = acpi_ut_create_buffer_object(0); } else { /* Error for all other expected types */ return (AE_AML_OPERAND_TYPE); } if (!new_object) { return (AE_NO_MEMORY); } /* Set the reference count according to the parent Package object */ new_object->common.reference_count = info->parent_package->common.reference_count; ACPI_DEBUG_PRINT((ACPI_DB_REPAIR, "%s: Converted NULL package element to expected %s at index %u\n", info->full_pathname, acpi_ut_get_object_type_name(new_object), package_index)); *return_object_ptr = new_object; info->return_flags |= ACPI_OBJECT_REPAIRED; return (AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore178100.00%4100.00%
Total178100.00%4100.00%

/****************************************************************************** * * FUNCTION: acpi_ns_remove_null_elements * * PARAMETERS: info - Method execution information block * package_type - An acpi_return_package_types value * obj_desc - A Package object * * RETURN: None. * * DESCRIPTION: Remove all NULL package elements from packages that contain * a variable number of subpackages. For these types of * packages, NULL elements can be safely removed. * *****************************************************************************/
void acpi_ns_remove_null_elements(struct acpi_evaluate_info *info, u8 package_type, union acpi_operand_object *obj_desc) { union acpi_operand_object **source; union acpi_operand_object **dest; u32 count; u32 new_count; u32 i; ACPI_FUNCTION_NAME(ns_remove_null_elements); /* * We can safely remove all NULL elements from these package types: * PTYPE1_VAR packages contain a variable number of simple data types. * PTYPE2 packages contain a variable number of subpackages. */ switch (package_type) { case ACPI_PTYPE1_VAR: case ACPI_PTYPE2: case ACPI_PTYPE2_COUNT: case ACPI_PTYPE2_PKG_COUNT: case ACPI_PTYPE2_FIXED: case ACPI_PTYPE2_MIN: case ACPI_PTYPE2_REV_FIXED: case ACPI_PTYPE2_FIX_VAR: break; default: case ACPI_PTYPE2_VAR_VAR: case ACPI_PTYPE1_FIXED: case ACPI_PTYPE1_OPTION: return; } count = obj_desc->package.count; new_count = count; source = obj_desc->package.elements; dest = source; /* Examine all elements of the package object, remove nulls */ for (i = 0; i < count; i++) { if (!*source) { new_count--; } else { *dest = *source; dest++; } source++; } /* Update parent package if any null elements were removed */ if (new_count < count) { ACPI_DEBUG_PRINT((ACPI_DB_REPAIR, "%s: Found and removed %u NULL elements\n", info->full_pathname, (count - new_count))); /* NULL terminate list and update the package count */ *dest = NULL; obj_desc->package.count = new_count; } }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore195100.00%6100.00%
Total195100.00%6100.00%

/******************************************************************************* * * FUNCTION: acpi_ns_wrap_with_package * * PARAMETERS: info - Method execution information block * original_object - Pointer to the object to repair. * obj_desc_ptr - The new package object is returned here * * RETURN: Status, new object in *obj_desc_ptr * * DESCRIPTION: Repair a common problem with objects that are defined to * return a variable-length Package of sub-objects. If there is * only one sub-object, some BIOS code mistakenly simply declares * the single object instead of a Package with one sub-object. * This function attempts to repair this error by wrapping a * Package object around the original object, creating the * correct and expected Package with one sub-object. * * Names that can be repaired in this manner include: * _ALR, _CSD, _HPX, _MLS, _PLD, _PRT, _PSS, _TRT, _TSS, * _BCL, _DOD, _FIX, _Sx * ******************************************************************************/
acpi_status acpi_ns_wrap_with_package(struct acpi_evaluate_info *info, union acpi_operand_object *original_object, union acpi_operand_object **obj_desc_ptr) { union acpi_operand_object *pkg_obj_desc; ACPI_FUNCTION_NAME(ns_wrap_with_package); /* * Create the new outer package and populate it. The new * package will have a single element, the lone sub-object. */ pkg_obj_desc = acpi_ut_create_package_object(1); if (!pkg_obj_desc) { return (AE_NO_MEMORY); } pkg_obj_desc->package.elements[0] = original_object; ACPI_DEBUG_PRINT((ACPI_DB_REPAIR, "%s: Wrapped %s with expected Package object\n", info->full_pathname, acpi_ut_get_object_type_name(original_object))); /* Return the new object in the object pointer */ *obj_desc_ptr = pkg_obj_desc; info->return_flags |= ACPI_OBJECT_REPAIRED | ACPI_OBJECT_WRAPPED; return (AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore99100.00%5100.00%
Total99100.00%5100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Robert Moore109686.10%1773.91%
Lv Zheng14811.63%521.74%
Lin Ming292.28%14.35%
Total1273100.00%23100.00%
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