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ubuntu-linux-kernel/drivers/acpi/acpica/nsrepair.c

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/******************************************************************************
*
* 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) {
/* Update reference count of new object */
if (!(info->return_flags & ACPI_OBJECT_WRAPPED)) {
new_object->common.reference_count =
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);
}
/******************************************************************************
*
* 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 */
}
/*******************************************************************************
*
* 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);
}
/******************************************************************************
*
* 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;
}
}
/*******************************************************************************
*
* 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);
}
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