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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.02/******************************************************************************3 *4 * Module Name: nsload - namespace loading/expanding/contracting procedures5 *6 * Copyright (C) 2000 - 2023, Intel Corp.7 *8 *****************************************************************************/9 10#include <acpi/acpi.h>11#include "accommon.h"12#include "acnamesp.h"13#include "acdispat.h"14#include "actables.h"15#include "acinterp.h"16 17#define _COMPONENT ACPI_NAMESPACE18ACPI_MODULE_NAME("nsload")19 20/* Local prototypes */21#ifdef ACPI_FUTURE_IMPLEMENTATION22acpi_status acpi_ns_unload_namespace(acpi_handle handle);23 24static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle);25#endif26 27/*******************************************************************************28 *29 * FUNCTION: acpi_ns_load_table30 *31 * PARAMETERS: table_index - Index for table to be loaded32 * node - Owning NS node33 *34 * RETURN: Status35 *36 * DESCRIPTION: Load one ACPI table into the namespace37 *38 ******************************************************************************/39 40acpi_status41acpi_ns_load_table(u32 table_index, struct acpi_namespace_node *node)42{43 acpi_status status;44 45 ACPI_FUNCTION_TRACE(ns_load_table);46 47 /* If table already loaded into namespace, just return */48 49 if (acpi_tb_is_table_loaded(table_index)) {50 status = AE_ALREADY_EXISTS;51 goto unlock;52 }53 54 ACPI_DEBUG_PRINT((ACPI_DB_INFO,55 "**** Loading table into namespace ****\n"));56 57 status = acpi_tb_allocate_owner_id(table_index);58 if (ACPI_FAILURE(status)) {59 goto unlock;60 }61 62 /*63 * Parse the table and load the namespace with all named64 * objects found within. Control methods are NOT parsed65 * at this time. In fact, the control methods cannot be66 * parsed until the entire namespace is loaded, because67 * if a control method makes a forward reference (call)68 * to another control method, we can't continue parsing69 * because we don't know how many arguments to parse next!70 */71 status = acpi_ns_parse_table(table_index, node);72 if (ACPI_SUCCESS(status)) {73 acpi_tb_set_table_loaded_flag(table_index, TRUE);74 } else {75 /*76 * On error, delete any namespace objects created by this table.77 * We cannot initialize these objects, so delete them. There are78 * a couple of especially bad cases:79 * AE_ALREADY_EXISTS - namespace collision.80 * AE_NOT_FOUND - the target of a Scope operator does not81 * exist. This target of Scope must already exist in the82 * namespace, as per the ACPI specification.83 */84 acpi_ns_delete_namespace_by_owner(acpi_gbl_root_table_list.85 tables[table_index].owner_id);86 87 acpi_tb_release_owner_id(table_index);88 return_ACPI_STATUS(status);89 }90 91unlock:92 if (ACPI_FAILURE(status)) {93 return_ACPI_STATUS(status);94 }95 96 /*97 * Now we can parse the control methods. We always parse98 * them here for a sanity check, and if configured for99 * just-in-time parsing, we delete the control method100 * parse trees.101 */102 ACPI_DEBUG_PRINT((ACPI_DB_INFO,103 "**** Begin Table Object Initialization\n"));104 105 acpi_ex_enter_interpreter();106 status = acpi_ds_initialize_objects(table_index, node);107 acpi_ex_exit_interpreter();108 109 ACPI_DEBUG_PRINT((ACPI_DB_INFO,110 "**** Completed Table Object Initialization\n"));111 112 return_ACPI_STATUS(status);113}114 115#ifdef ACPI_OBSOLETE_FUNCTIONS116/*******************************************************************************117 *118 * FUNCTION: acpi_load_namespace119 *120 * PARAMETERS: None121 *122 * RETURN: Status123 *124 * DESCRIPTION: Load the name space from what ever is pointed to by DSDT.125 * (DSDT points to either the BIOS or a buffer.)126 *127 ******************************************************************************/128 129acpi_status acpi_ns_load_namespace(void)130{131 acpi_status status;132 133 ACPI_FUNCTION_TRACE(acpi_load_name_space);134 135 /* There must be at least a DSDT installed */136 137 if (acpi_gbl_DSDT == NULL) {138 ACPI_ERROR((AE_INFO, "DSDT is not in memory"));139 return_ACPI_STATUS(AE_NO_ACPI_TABLES);140 }141 142 /*143 * Load the namespace. The DSDT is required,144 * but the SSDT and PSDT tables are optional.145 */146 status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT);147 if (ACPI_FAILURE(status)) {148 return_ACPI_STATUS(status);149 }150 151 /* Ignore exceptions from these */152 153 (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT);154 (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT);155 156 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,157 "ACPI Namespace successfully loaded at root %p\n",158 acpi_gbl_root_node));159 160 return_ACPI_STATUS(status);161}162#endif163 164#ifdef ACPI_FUTURE_IMPLEMENTATION165/*******************************************************************************166 *167 * FUNCTION: acpi_ns_delete_subtree168 *169 * PARAMETERS: start_handle - Handle in namespace where search begins170 *171 * RETURNS Status172 *173 * DESCRIPTION: Walks the namespace starting at the given handle and deletes174 * all objects, entries, and scopes in the entire subtree.175 *176 * Namespace/Interpreter should be locked or the subsystem should177 * be in shutdown before this routine is called.178 *179 ******************************************************************************/180 181static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle)182{183 acpi_status status;184 acpi_handle child_handle;185 acpi_handle parent_handle;186 acpi_handle next_child_handle;187 acpi_handle dummy;188 u32 level;189 190 ACPI_FUNCTION_TRACE(ns_delete_subtree);191 192 parent_handle = start_handle;193 child_handle = NULL;194 level = 1;195 196 /*197 * Traverse the tree of objects until we bubble back up198 * to where we started.199 */200 while (level > 0) {201 202 /* Attempt to get the next object in this scope */203 204 status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle,205 child_handle, &next_child_handle);206 207 child_handle = next_child_handle;208 209 /* Did we get a new object? */210 211 if (ACPI_SUCCESS(status)) {212 213 /* Check if this object has any children */214 215 if (ACPI_SUCCESS216 (acpi_get_next_object217 (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) {218 /*219 * There is at least one child of this object,220 * visit the object221 */222 level++;223 parent_handle = child_handle;224 child_handle = NULL;225 }226 } else {227 /*228 * No more children in this object, go back up to229 * the object's parent230 */231 level--;232 233 /* Delete all children now */234 235 acpi_ns_delete_children(child_handle);236 237 child_handle = parent_handle;238 status = acpi_get_parent(parent_handle, &parent_handle);239 if (ACPI_FAILURE(status)) {240 return_ACPI_STATUS(status);241 }242 }243 }244 245 /* Now delete the starting object, and we are done */246 247 acpi_ns_remove_node(child_handle);248 return_ACPI_STATUS(AE_OK);249}250 251/*******************************************************************************252 *253 * FUNCTION: acpi_ns_unload_name_space254 *255 * PARAMETERS: handle - Root of namespace subtree to be deleted256 *257 * RETURN: Status258 *259 * DESCRIPTION: Shrinks the namespace, typically in response to an undocking260 * event. Deletes an entire subtree starting from (and261 * including) the given handle.262 *263 ******************************************************************************/264 265acpi_status acpi_ns_unload_namespace(acpi_handle handle)266{267 acpi_status status;268 269 ACPI_FUNCTION_TRACE(ns_unload_name_space);270 271 /* Parameter validation */272 273 if (!acpi_gbl_root_node) {274 return_ACPI_STATUS(AE_NO_NAMESPACE);275 }276 277 if (!handle) {278 return_ACPI_STATUS(AE_BAD_PARAMETER);279 }280 281 /* This function does the real work */282 283 status = acpi_ns_delete_subtree(handle);284 return_ACPI_STATUS(status);285}286#endif287