blob: 224c3005340112add4471f37c7b676247dfdfb34 [file] [log] [blame]
/******************************************************************************
*
* Module Name: nspredef - Validation of ACPI predefined methods and objects
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2013, 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_predefined_data *data,
union acpi_operand_object *return_object);
static void acpi_ns_get_expected_types(char *buffer, u32 expected_btypes);
/*
* Names for the types that can be returned by the predefined objects.
* Used for warning messages. Must be in the same order as the ACPI_RTYPEs
*/
static const char *acpi_rtype_names[] = {
"/Integer",
"/String",
"/Buffer",
"/Package",
"/Reference",
};
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_predefined_names
*
* PARAMETERS: node - Namespace node for the method/object
* 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 an ACPI name for a match in the predefined name list.
*
******************************************************************************/
acpi_status
acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
u32 user_param_count,
acpi_status return_status,
union acpi_operand_object **return_object_ptr)
{
union acpi_operand_object *return_object = *return_object_ptr;
acpi_status status = AE_OK;
const union acpi_predefined_info *predefined;
char *pathname;
struct acpi_predefined_data *data;
/* Match the name for this method/object against the predefined list */
predefined = acpi_ns_check_for_predefined_name(node);
/* Get the full pathname to the object, for use in warning messages */
pathname = acpi_ns_get_external_pathname(node);
if (!pathname) {
return (AE_OK); /* Could not get pathname, ignore */
}
/*
* Check that the parameter count for this method matches the ASL
* definition. For predefined names, ensure that both the caller and
* the method itself are in accordance with the ACPI specification.
*/
acpi_ns_check_parameter_count(pathname, node, user_param_count,
predefined);
/* If not a predefined name, we cannot validate the return object */
if (!predefined) {
goto cleanup;
}
/*
* 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)) {
goto cleanup;
}
/*
* 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.
*
* Exit now if there is no return object. Warning if one was expected.
*/
if (!return_object) {
if ((predefined->info.expected_btypes) &&
(!(predefined->info.expected_btypes & ACPI_RTYPE_NONE))) {
ACPI_WARN_PREDEFINED((AE_INFO, pathname,
ACPI_WARN_ALWAYS,
"Missing expected return value"));
status = AE_AML_NO_RETURN_VALUE;
}
goto cleanup;
}
/*
* 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)) {
goto cleanup;
}
/* Create the parameter data block for object validation */
data = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_predefined_data));
if (!data) {
goto cleanup;
}
data->predefined = predefined;
data->node = node;
data->node_flags = node->flags;
data->pathname = pathname;
/*
* Check that the type of the main return object is what is expected
* for this predefined name
*/
status = acpi_ns_check_object_type(data, return_object_ptr,
predefined->info.expected_btypes,
ACPI_NOT_PACKAGE_ELEMENT);
if (ACPI_FAILURE(status)) {
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) {
data->parent_package = *return_object_ptr;
status = acpi_ns_check_package(data, return_object_ptr);
if (ACPI_FAILURE(status)) {
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(data, 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) || (data->flags & ACPI_OBJECT_REPAIRED)) {
node->flags |= ANOBJ_EVALUATED;
}
ACPI_FREE(data);
cleanup:
ACPI_FREE(pathname);
return (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_parameter_count
*
* PARAMETERS: pathname - Full pathname to the node (for error msgs)
* node - Namespace node for the method/object
* user_param_count - Number of args passed in by the caller
* predefined - Pointer to entry in predefined name table
*
* RETURN: None
*
* DESCRIPTION: Check that the declared (in ASL/AML) parameter count for a
* predefined name is what is expected (i.e., what is defined in
* the ACPI specification for this predefined name.)
*
******************************************************************************/
void
acpi_ns_check_parameter_count(char *pathname,
struct acpi_namespace_node *node,
u32 user_param_count,
const union acpi_predefined_info *predefined)
{
u32 param_count;
u32 required_params_current;
u32 required_params_old;
/* Methods have 0-7 parameters. All other types have zero. */
param_count = 0;
if (node->type == ACPI_TYPE_METHOD) {
param_count = node->object->method.param_count;
}
if (!predefined) {
/*
* Check the parameter count for non-predefined methods/objects.
*
* Warning if too few or too many arguments have been passed by the
* caller. An incorrect number of arguments may not cause the method
* to fail. However, the method will fail if there are too few
* arguments and the method attempts to use one of the missing ones.
*/
if (user_param_count < param_count) {
ACPI_WARN_PREDEFINED((AE_INFO, pathname,
ACPI_WARN_ALWAYS,
"Insufficient arguments - needs %u, found %u",
param_count, user_param_count));
} else if (user_param_count > param_count) {
ACPI_WARN_PREDEFINED((AE_INFO, pathname,
ACPI_WARN_ALWAYS,
"Excess arguments - needs %u, found %u",
param_count, user_param_count));
}
return;
}
/*
* Validate the user-supplied parameter count.
* Allow two different legal argument counts (_SCP, etc.)
*/
required_params_current = predefined->info.param_count & 0x0F;
required_params_old = predefined->info.param_count >> 4;
if (user_param_count != ACPI_UINT32_MAX) {
if ((user_param_count != required_params_current) &&
(user_param_count != required_params_old)) {
ACPI_WARN_PREDEFINED((AE_INFO, pathname,
ACPI_WARN_ALWAYS,
"Parameter count mismatch - "
"caller passed %u, ACPI requires %u",
user_param_count,
required_params_current));
}
}
/*
* Check that the ASL-defined parameter count is what is expected for
* this predefined name (parameter count as defined by the ACPI
* specification)
*/
if ((param_count != required_params_current) &&
(param_count != required_params_old)) {
ACPI_WARN_PREDEFINED((AE_INFO, pathname, node->flags,
"Parameter count mismatch - ASL declared %u, ACPI requires %u",
param_count, required_params_current));
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_for_predefined_name
*
* PARAMETERS: node - Namespace node for the method/object
*
* RETURN: Pointer to entry in predefined table. NULL indicates not found.
*
* DESCRIPTION: Check an object name against the predefined object list.
*
******************************************************************************/
const union acpi_predefined_info *acpi_ns_check_for_predefined_name(struct
acpi_namespace_node
*node)
{
const union acpi_predefined_info *this_name;
/* Quick check for a predefined name, first character must be underscore */
if (node->name.ascii[0] != '_') {
return (NULL);
}
/* Search info table for a predefined method/object name */
this_name = predefined_names;
while (this_name->info.name[0]) {
if (ACPI_COMPARE_NAME(node->name.ascii, this_name->info.name)) {
return (this_name);
}
/*
* Skip next entry in the table if this name returns a Package
* (next entry contains the package info)
*/
if (this_name->info.expected_btypes & ACPI_RTYPE_PACKAGE) {
this_name++;
}
this_name++;
}
return (NULL); /* Not found */
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_object_type
*
* PARAMETERS: data - Pointer to validation data structure
* 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_predefined_data *data,
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;
u32 return_btype;
char type_buffer[48]; /* Room for 5 types */
/*
* If we get a NULL return_object here, it is a NULL package element.
* Since all extraneous NULL package elements were removed earlier by a
* call to acpi_ns_remove_null_elements, this is an unexpected NULL element.
* We will attempt to repair it.
*/
if (!return_object) {
status = acpi_ns_repair_null_element(data, expected_btypes,
package_index,
return_object_ptr);
if (ACPI_SUCCESS(status)) {
return (AE_OK); /* Repair was successful */
}
goto type_error_exit;
}
/* A Namespace node should not get here, but make sure */
if (ACPI_GET_DESCRIPTOR_TYPE(return_object) == ACPI_DESC_TYPE_NAMED) {
ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->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)
*/
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 */
goto type_error_exit;
}
/* Is the object one of the expected types? */
if (return_btype & expected_btypes) {
/* For reference objects, check that the reference type is correct */
if (return_object->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
status = acpi_ns_check_reference(data, return_object);
}
return (status);
}
/* Type mismatch -- attempt repair of the returned object */
status = acpi_ns_repair_object(data, expected_btypes,
package_index, return_object_ptr);
if (ACPI_SUCCESS(status)) {
return (AE_OK); /* Repair was successful */
}
type_error_exit:
/* Create a string with all expected types for this predefined object */
acpi_ns_get_expected_types(type_buffer, expected_btypes);
if (package_index == ACPI_NOT_PACKAGE_ELEMENT) {
ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->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, data->pathname, data->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: data - Pointer to validation data structure
* 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_predefined_data *data,
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, data->pathname, data->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_expected_types
*
* PARAMETERS: buffer - Pointer to where the string is returned
* expected_btypes - Bitmap of expected return type(s)
*
* RETURN: Buffer is populated with type names.
*
* DESCRIPTION: Translate the expected types bitmap into a string of ascii
* names of expected types, for use in warning messages.
*
******************************************************************************/
static void acpi_ns_get_expected_types(char *buffer, u32 expected_btypes)
{
u32 this_rtype;
u32 i;
u32 j;
j = 1;
buffer[0] = 0;
this_rtype = ACPI_RTYPE_INTEGER;
for (i = 0; i < ACPI_NUM_RTYPES; i++) {
/* If one of the expected types, concatenate the name of this type */
if (expected_btypes & this_rtype) {
ACPI_STRCAT(buffer, &acpi_rtype_names[i][j]);
j = 0; /* Use name separator from now on */
}
this_rtype <<= 1; /* Next Rtype */
}
}