linux-stable/drivers/acpi/acpica/utobject.c
Bob Moore a62a7117d9 ACPICA: Implement deferred resolution of reference package elements
ACPICA commit 0c08790c56fdf0dc081ae869495a09d8c4230854

This change defers the resolution of package elements that
are named references until after the entire namespace has been
loaded from the definition block. This allows such references
to be in fact forward references for both module level code
and control methods.

Link: https://github.com/acpica/acpica/commit/0c08790c
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-08-03 23:34:17 +02:00

715 lines
20 KiB
C

/******************************************************************************
*
* Module Name: utobject - ACPI object create/delete/size/cache routines
*
*****************************************************************************/
/*
* 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"
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME("utobject")
/* Local prototypes */
static acpi_status
acpi_ut_get_simple_object_size(union acpi_operand_object *obj,
acpi_size *obj_length);
static acpi_status
acpi_ut_get_package_object_size(union acpi_operand_object *obj,
acpi_size *obj_length);
static acpi_status
acpi_ut_get_element_length(u8 object_type,
union acpi_operand_object *source_object,
union acpi_generic_state *state, void *context);
/*******************************************************************************
*
* FUNCTION: acpi_ut_create_internal_object_dbg
*
* PARAMETERS: module_name - Source file name of caller
* line_number - Line number of caller
* component_id - Component type of caller
* type - ACPI Type of the new object
*
* RETURN: A new internal object, null on failure
*
* DESCRIPTION: Create and initialize a new internal object.
*
* NOTE: We always allocate the worst-case object descriptor because
* these objects are cached, and we want them to be
* one-size-satisifies-any-request. This in itself may not be
* the most memory efficient, but the efficiency of the object
* cache should more than make up for this!
*
******************************************************************************/
union acpi_operand_object *acpi_ut_create_internal_object_dbg(const char
*module_name,
u32 line_number,
u32 component_id,
acpi_object_type
type)
{
union acpi_operand_object *object;
union acpi_operand_object *second_object;
ACPI_FUNCTION_TRACE_STR(ut_create_internal_object_dbg,
acpi_ut_get_type_name(type));
/* Allocate the raw object descriptor */
object =
acpi_ut_allocate_object_desc_dbg(module_name, line_number,
component_id);
if (!object) {
return_PTR(NULL);
}
switch (type) {
case ACPI_TYPE_REGION:
case ACPI_TYPE_BUFFER_FIELD:
case ACPI_TYPE_LOCAL_BANK_FIELD:
/* These types require a secondary object */
second_object =
acpi_ut_allocate_object_desc_dbg(module_name, line_number,
component_id);
if (!second_object) {
acpi_ut_delete_object_desc(object);
return_PTR(NULL);
}
second_object->common.type = ACPI_TYPE_LOCAL_EXTRA;
second_object->common.reference_count = 1;
/* Link the second object to the first */
object->common.next_object = second_object;
break;
default:
/* All others have no secondary object */
break;
}
/* Save the object type in the object descriptor */
object->common.type = (u8) type;
/* Init the reference count */
object->common.reference_count = 1;
/* Any per-type initialization should go here */
return_PTR(object);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_create_package_object
*
* PARAMETERS: count - Number of package elements
*
* RETURN: Pointer to a new Package object, null on failure
*
* DESCRIPTION: Create a fully initialized package object
*
******************************************************************************/
union acpi_operand_object *acpi_ut_create_package_object(u32 count)
{
union acpi_operand_object *package_desc;
union acpi_operand_object **package_elements;
ACPI_FUNCTION_TRACE_U32(ut_create_package_object, count);
/* Create a new Package object */
package_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
if (!package_desc) {
return_PTR(NULL);
}
/*
* Create the element array. Count+1 allows the array to be null
* terminated.
*/
package_elements = ACPI_ALLOCATE_ZEROED(((acpi_size)count +
1) * sizeof(void *));
if (!package_elements) {
ACPI_FREE(package_desc);
return_PTR(NULL);
}
package_desc->package.count = count;
package_desc->package.elements = package_elements;
return_PTR(package_desc);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_create_integer_object
*
* PARAMETERS: initial_value - Initial value for the integer
*
* RETURN: Pointer to a new Integer object, null on failure
*
* DESCRIPTION: Create an initialized integer object
*
******************************************************************************/
union acpi_operand_object *acpi_ut_create_integer_object(u64 initial_value)
{
union acpi_operand_object *integer_desc;
ACPI_FUNCTION_TRACE(ut_create_integer_object);
/* Create and initialize a new integer object */
integer_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
if (!integer_desc) {
return_PTR(NULL);
}
integer_desc->integer.value = initial_value;
return_PTR(integer_desc);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_create_buffer_object
*
* PARAMETERS: buffer_size - Size of buffer to be created
*
* RETURN: Pointer to a new Buffer object, null on failure
*
* DESCRIPTION: Create a fully initialized buffer object
*
******************************************************************************/
union acpi_operand_object *acpi_ut_create_buffer_object(acpi_size buffer_size)
{
union acpi_operand_object *buffer_desc;
u8 *buffer = NULL;
ACPI_FUNCTION_TRACE_U32(ut_create_buffer_object, buffer_size);
/* Create a new Buffer object */
buffer_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
if (!buffer_desc) {
return_PTR(NULL);
}
/* Create an actual buffer only if size > 0 */
if (buffer_size > 0) {
/* Allocate the actual buffer */
buffer = ACPI_ALLOCATE_ZEROED(buffer_size);
if (!buffer) {
ACPI_ERROR((AE_INFO, "Could not allocate size %u",
(u32)buffer_size));
acpi_ut_remove_reference(buffer_desc);
return_PTR(NULL);
}
}
/* Complete buffer object initialization */
buffer_desc->buffer.flags |= AOPOBJ_DATA_VALID;
buffer_desc->buffer.pointer = buffer;
buffer_desc->buffer.length = (u32) buffer_size;
/* Return the new buffer descriptor */
return_PTR(buffer_desc);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_create_string_object
*
* PARAMETERS: string_size - Size of string to be created. Does not
* include NULL terminator, this is added
* automatically.
*
* RETURN: Pointer to a new String object
*
* DESCRIPTION: Create a fully initialized string object
*
******************************************************************************/
union acpi_operand_object *acpi_ut_create_string_object(acpi_size string_size)
{
union acpi_operand_object *string_desc;
char *string;
ACPI_FUNCTION_TRACE_U32(ut_create_string_object, string_size);
/* Create a new String object */
string_desc = acpi_ut_create_internal_object(ACPI_TYPE_STRING);
if (!string_desc) {
return_PTR(NULL);
}
/*
* Allocate the actual string buffer -- (Size + 1) for NULL terminator.
* NOTE: Zero-length strings are NULL terminated
*/
string = ACPI_ALLOCATE_ZEROED(string_size + 1);
if (!string) {
ACPI_ERROR((AE_INFO, "Could not allocate size %u",
(u32)string_size));
acpi_ut_remove_reference(string_desc);
return_PTR(NULL);
}
/* Complete string object initialization */
string_desc->string.pointer = string;
string_desc->string.length = (u32) string_size;
/* Return the new string descriptor */
return_PTR(string_desc);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_valid_internal_object
*
* PARAMETERS: object - Object to be validated
*
* RETURN: TRUE if object is valid, FALSE otherwise
*
* DESCRIPTION: Validate a pointer to be of type union acpi_operand_object
*
******************************************************************************/
u8 acpi_ut_valid_internal_object(void *object)
{
ACPI_FUNCTION_NAME(ut_valid_internal_object);
/* Check for a null pointer */
if (!object) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "**** Null Object Ptr\n"));
return (FALSE);
}
/* Check the descriptor type field */
switch (ACPI_GET_DESCRIPTOR_TYPE(object)) {
case ACPI_DESC_TYPE_OPERAND:
/* The object appears to be a valid union acpi_operand_object */
return (TRUE);
default:
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"%p is not an ACPI operand obj [%s]\n",
object, acpi_ut_get_descriptor_name(object)));
break;
}
return (FALSE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_allocate_object_desc_dbg
*
* PARAMETERS: module_name - Caller's module name (for error output)
* line_number - Caller's line number (for error output)
* component_id - Caller's component ID (for error output)
*
* RETURN: Pointer to newly allocated object descriptor. Null on error
*
* DESCRIPTION: Allocate a new object descriptor. Gracefully handle
* error conditions.
*
******************************************************************************/
void *acpi_ut_allocate_object_desc_dbg(const char *module_name,
u32 line_number, u32 component_id)
{
union acpi_operand_object *object;
ACPI_FUNCTION_TRACE(ut_allocate_object_desc_dbg);
object = acpi_os_acquire_object(acpi_gbl_operand_cache);
if (!object) {
ACPI_ERROR((module_name, line_number,
"Could not allocate an object descriptor"));
return_PTR(NULL);
}
/* Mark the descriptor type */
ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_OPERAND);
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "%p Size %X\n",
object, (u32) sizeof(union acpi_operand_object)));
return_PTR(object);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_delete_object_desc
*
* PARAMETERS: object - An Acpi internal object to be deleted
*
* RETURN: None.
*
* DESCRIPTION: Free an ACPI object descriptor or add it to the object cache
*
******************************************************************************/
void acpi_ut_delete_object_desc(union acpi_operand_object *object)
{
ACPI_FUNCTION_TRACE_PTR(ut_delete_object_desc, object);
/* Object must be of type union acpi_operand_object */
if (ACPI_GET_DESCRIPTOR_TYPE(object) != ACPI_DESC_TYPE_OPERAND) {
ACPI_ERROR((AE_INFO,
"%p is not an ACPI Operand object [%s]", object,
acpi_ut_get_descriptor_name(object)));
return_VOID;
}
(void)acpi_os_release_object(acpi_gbl_operand_cache, object);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_get_simple_object_size
*
* PARAMETERS: internal_object - An ACPI operand object
* obj_length - Where the length is returned
*
* RETURN: Status
*
* DESCRIPTION: This function is called to determine the space required to
* contain a simple object for return to an external user.
*
* The length includes the object structure plus any additional
* needed space.
*
******************************************************************************/
static acpi_status
acpi_ut_get_simple_object_size(union acpi_operand_object *internal_object,
acpi_size *obj_length)
{
acpi_size length;
acpi_size size;
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE_PTR(ut_get_simple_object_size, internal_object);
/* Start with the length of the (external) Acpi object */
length = sizeof(union acpi_object);
/* A NULL object is allowed, can be a legal uninitialized package element */
if (!internal_object) {
/*
* Object is NULL, just return the length of union acpi_object
* (A NULL union acpi_object is an object of all zeroes.)
*/
*obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
return_ACPI_STATUS(AE_OK);
}
/* A Namespace Node should never appear here */
if (ACPI_GET_DESCRIPTOR_TYPE(internal_object) == ACPI_DESC_TYPE_NAMED) {
/* A namespace node should never get here */
ACPI_ERROR((AE_INFO,
"Received a namespace node [%4.4s] "
"where an operand object is required",
ACPI_CAST_PTR(struct acpi_namespace_node,
internal_object)->name.ascii));
return_ACPI_STATUS(AE_AML_INTERNAL);
}
/*
* The final length depends on the object type
* Strings and Buffers are packed right up against the parent object and
* must be accessed bytewise or there may be alignment problems on
* certain processors
*/
switch (internal_object->common.type) {
case ACPI_TYPE_STRING:
length += (acpi_size)internal_object->string.length + 1;
break;
case ACPI_TYPE_BUFFER:
length += (acpi_size)internal_object->buffer.length;
break;
case ACPI_TYPE_INTEGER:
case ACPI_TYPE_PROCESSOR:
case ACPI_TYPE_POWER:
/* No extra data for these types */
break;
case ACPI_TYPE_LOCAL_REFERENCE:
switch (internal_object->reference.class) {
case ACPI_REFCLASS_NAME:
/*
* Get the actual length of the full pathname to this object.
* The reference will be converted to the pathname to the object
*/
size =
acpi_ns_get_pathname_length(internal_object->
reference.node);
if (!size) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
length += ACPI_ROUND_UP_TO_NATIVE_WORD(size);
break;
default:
/*
* No other reference opcodes are supported.
* Notably, Locals and Args are not supported, but this may be
* required eventually.
*/
ACPI_ERROR((AE_INFO,
"Cannot convert to external object - "
"unsupported Reference Class [%s] 0x%X in object %p",
acpi_ut_get_reference_name(internal_object),
internal_object->reference.class,
internal_object));
status = AE_TYPE;
break;
}
break;
default:
ACPI_ERROR((AE_INFO, "Cannot convert to external object - "
"unsupported type [%s] 0x%X in object %p",
acpi_ut_get_object_type_name(internal_object),
internal_object->common.type, internal_object));
status = AE_TYPE;
break;
}
/*
* Account for the space required by the object rounded up to the next
* multiple of the machine word size. This keeps each object aligned
* on a machine word boundary. (preventing alignment faults on some
* machines.)
*/
*obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_get_element_length
*
* PARAMETERS: acpi_pkg_callback
*
* RETURN: Status
*
* DESCRIPTION: Get the length of one package element.
*
******************************************************************************/
static acpi_status
acpi_ut_get_element_length(u8 object_type,
union acpi_operand_object *source_object,
union acpi_generic_state *state, void *context)
{
acpi_status status = AE_OK;
struct acpi_pkg_info *info = (struct acpi_pkg_info *)context;
acpi_size object_space;
switch (object_type) {
case ACPI_COPY_TYPE_SIMPLE:
/*
* Simple object - just get the size (Null object/entry is handled
* here also) and sum it into the running package length
*/
status =
acpi_ut_get_simple_object_size(source_object,
&object_space);
if (ACPI_FAILURE(status)) {
return (status);
}
info->length += object_space;
break;
case ACPI_COPY_TYPE_PACKAGE:
/* Package object - nothing much to do here, let the walk handle it */
info->num_packages++;
state->pkg.this_target_obj = NULL;
break;
default:
/* No other types allowed */
return (AE_BAD_PARAMETER);
}
return (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_get_package_object_size
*
* PARAMETERS: internal_object - An ACPI internal object
* obj_length - Where the length is returned
*
* RETURN: Status
*
* DESCRIPTION: This function is called to determine the space required to
* contain a package object for return to an external user.
*
* This is moderately complex since a package contains other
* objects including packages.
*
******************************************************************************/
static acpi_status
acpi_ut_get_package_object_size(union acpi_operand_object *internal_object,
acpi_size *obj_length)
{
acpi_status status;
struct acpi_pkg_info info;
ACPI_FUNCTION_TRACE_PTR(ut_get_package_object_size, internal_object);
info.length = 0;
info.object_space = 0;
info.num_packages = 1;
status =
acpi_ut_walk_package_tree(internal_object, NULL,
acpi_ut_get_element_length, &info);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* We have handled all of the objects in all levels of the package.
* just add the length of the package objects themselves.
* Round up to the next machine word.
*/
info.length +=
ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object)) *
(acpi_size)info.num_packages;
/* Return the total package length */
*obj_length = info.length;
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_get_object_size
*
* PARAMETERS: internal_object - An ACPI internal object
* obj_length - Where the length will be returned
*
* RETURN: Status
*
* DESCRIPTION: This function is called to determine the space required to
* contain an object for return to an API user.
*
******************************************************************************/
acpi_status
acpi_ut_get_object_size(union acpi_operand_object *internal_object,
acpi_size *obj_length)
{
acpi_status status;
ACPI_FUNCTION_ENTRY();
if ((ACPI_GET_DESCRIPTOR_TYPE(internal_object) ==
ACPI_DESC_TYPE_OPERAND) &&
(internal_object->common.type == ACPI_TYPE_PACKAGE)) {
status =
acpi_ut_get_package_object_size(internal_object,
obj_length);
} else {
status =
acpi_ut_get_simple_object_size(internal_object, obj_length);
}
return (status);
}