287 lines
7.5 KiB
C
287 lines
7.5 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: nsload - namespace loading/expanding/contracting procedures
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*
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* Copyright (C) 2000 - 2019, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acnamesp.h"
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#include "acdispat.h"
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#include "actables.h"
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#include "acinterp.h"
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nsload")
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/* Local prototypes */
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#ifdef ACPI_FUTURE_IMPLEMENTATION
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acpi_status acpi_ns_unload_namespace(acpi_handle handle);
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static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle);
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#endif
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_load_table
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*
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* PARAMETERS: table_index - Index for table to be loaded
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* node - Owning NS node
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*
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* RETURN: Status
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*
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* DESCRIPTION: Load one ACPI table into the namespace
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*
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******************************************************************************/
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acpi_status
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acpi_ns_load_table(u32 table_index, struct acpi_namespace_node *node)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ns_load_table);
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/* If table already loaded into namespace, just return */
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if (acpi_tb_is_table_loaded(table_index)) {
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status = AE_ALREADY_EXISTS;
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goto unlock;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"**** Loading table into namespace ****\n"));
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status = acpi_tb_allocate_owner_id(table_index);
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if (ACPI_FAILURE(status)) {
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goto unlock;
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}
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/*
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* Parse the table and load the namespace with all named
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* objects found within. Control methods are NOT parsed
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* at this time. In fact, the control methods cannot be
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* parsed until the entire namespace is loaded, because
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* if a control method makes a forward reference (call)
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* to another control method, we can't continue parsing
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* because we don't know how many arguments to parse next!
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*/
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status = acpi_ns_parse_table(table_index, node);
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if (ACPI_SUCCESS(status)) {
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acpi_tb_set_table_loaded_flag(table_index, TRUE);
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} else {
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/*
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* On error, delete any namespace objects created by this table.
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* We cannot initialize these objects, so delete them. There are
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* a couple of especially bad cases:
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* AE_ALREADY_EXISTS - namespace collision.
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* AE_NOT_FOUND - the target of a Scope operator does not
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* exist. This target of Scope must already exist in the
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* namespace, as per the ACPI specification.
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*/
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acpi_ns_delete_namespace_by_owner(acpi_gbl_root_table_list.
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tables[table_index].owner_id);
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acpi_tb_release_owner_id(table_index);
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return_ACPI_STATUS(status);
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}
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unlock:
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/*
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* Now we can parse the control methods. We always parse
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* them here for a sanity check, and if configured for
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* just-in-time parsing, we delete the control method
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* parse trees.
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"**** Begin Table Object Initialization\n"));
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acpi_ex_enter_interpreter();
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status = acpi_ds_initialize_objects(table_index, node);
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acpi_ex_exit_interpreter();
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"**** Completed Table Object Initialization\n"));
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return_ACPI_STATUS(status);
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}
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#ifdef ACPI_OBSOLETE_FUNCTIONS
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/*******************************************************************************
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*
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* FUNCTION: acpi_load_namespace
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
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* (DSDT points to either the BIOS or a buffer.)
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*
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******************************************************************************/
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acpi_status acpi_ns_load_namespace(void)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(acpi_load_name_space);
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/* There must be at least a DSDT installed */
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if (acpi_gbl_DSDT == NULL) {
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ACPI_ERROR((AE_INFO, "DSDT is not in memory"));
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return_ACPI_STATUS(AE_NO_ACPI_TABLES);
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}
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/*
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* Load the namespace. The DSDT is required,
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* but the SSDT and PSDT tables are optional.
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*/
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status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Ignore exceptions from these */
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(void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT);
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(void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT);
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
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"ACPI Namespace successfully loaded at root %p\n",
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acpi_gbl_root_node));
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return_ACPI_STATUS(status);
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}
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#endif
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#ifdef ACPI_FUTURE_IMPLEMENTATION
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_delete_subtree
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*
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* PARAMETERS: start_handle - Handle in namespace where search begins
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*
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* RETURNS Status
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*
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* DESCRIPTION: Walks the namespace starting at the given handle and deletes
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* all objects, entries, and scopes in the entire subtree.
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*
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* Namespace/Interpreter should be locked or the subsystem should
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* be in shutdown before this routine is called.
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*
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******************************************************************************/
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static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle)
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{
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acpi_status status;
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acpi_handle child_handle;
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acpi_handle parent_handle;
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acpi_handle next_child_handle;
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acpi_handle dummy;
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u32 level;
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ACPI_FUNCTION_TRACE(ns_delete_subtree);
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parent_handle = start_handle;
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child_handle = NULL;
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level = 1;
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/*
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* Traverse the tree of objects until we bubble back up
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* to where we started.
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*/
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while (level > 0) {
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/* Attempt to get the next object in this scope */
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status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle,
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child_handle, &next_child_handle);
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child_handle = next_child_handle;
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/* Did we get a new object? */
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if (ACPI_SUCCESS(status)) {
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/* Check if this object has any children */
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if (ACPI_SUCCESS
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(acpi_get_next_object
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(ACPI_TYPE_ANY, child_handle, NULL, &dummy))) {
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/*
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* There is at least one child of this object,
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* visit the object
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*/
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level++;
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parent_handle = child_handle;
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child_handle = NULL;
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}
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} else {
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/*
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* No more children in this object, go back up to
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* the object's parent
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*/
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level--;
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/* Delete all children now */
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acpi_ns_delete_children(child_handle);
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child_handle = parent_handle;
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status = acpi_get_parent(parent_handle, &parent_handle);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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}
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/* Now delete the starting object, and we are done */
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acpi_ns_remove_node(child_handle);
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_unload_name_space
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*
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* PARAMETERS: handle - Root of namespace subtree to be deleted
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*
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* RETURN: Status
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*
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* DESCRIPTION: Shrinks the namespace, typically in response to an undocking
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* event. Deletes an entire subtree starting from (and
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* including) the given handle.
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*
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******************************************************************************/
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acpi_status acpi_ns_unload_namespace(acpi_handle handle)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ns_unload_name_space);
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/* Parameter validation */
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if (!acpi_gbl_root_node) {
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return_ACPI_STATUS(AE_NO_NAMESPACE);
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}
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if (!handle) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* This function does the real work */
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status = acpi_ns_delete_subtree(handle);
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return_ACPI_STATUS(status);
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}
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#endif
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