1 /****************************************************************************** 2 * 3 * Module Name: nsload - namespace loading/expanding/contracting procedures 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2015, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44 #include <acpi/acpi.h> 45 #include "accommon.h" 46 #include "acnamesp.h" 47 #include "acdispat.h" 48 #include "actables.h" 49 50 #define _COMPONENT ACPI_NAMESPACE 51 ACPI_MODULE_NAME("nsload") 52 53 /* Local prototypes */ 54 #ifdef ACPI_FUTURE_IMPLEMENTATION 55 acpi_status acpi_ns_unload_namespace(acpi_handle handle); 56 57 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle); 58 #endif 59 60 #ifndef ACPI_NO_METHOD_EXECUTION 61 /******************************************************************************* 62 * 63 * FUNCTION: acpi_ns_load_table 64 * 65 * PARAMETERS: table_index - Index for table to be loaded 66 * node - Owning NS node 67 * 68 * RETURN: Status 69 * 70 * DESCRIPTION: Load one ACPI table into the namespace 71 * 72 ******************************************************************************/ 73 74 acpi_status 75 acpi_ns_load_table(u32 table_index, struct acpi_namespace_node *node) 76 { 77 acpi_status status; 78 79 ACPI_FUNCTION_TRACE(ns_load_table); 80 81 /* 82 * Parse the table and load the namespace with all named 83 * objects found within. Control methods are NOT parsed 84 * at this time. In fact, the control methods cannot be 85 * parsed until the entire namespace is loaded, because 86 * if a control method makes a forward reference (call) 87 * to another control method, we can't continue parsing 88 * because we don't know how many arguments to parse next! 89 */ 90 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 91 if (ACPI_FAILURE(status)) { 92 return_ACPI_STATUS(status); 93 } 94 95 /* If table already loaded into namespace, just return */ 96 97 if (acpi_tb_is_table_loaded(table_index)) { 98 status = AE_ALREADY_EXISTS; 99 goto unlock; 100 } 101 102 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 103 "**** Loading table into namespace ****\n")); 104 105 status = acpi_tb_allocate_owner_id(table_index); 106 if (ACPI_FAILURE(status)) { 107 goto unlock; 108 } 109 110 status = acpi_ns_parse_table(table_index, node); 111 if (ACPI_SUCCESS(status)) { 112 acpi_tb_set_table_loaded_flag(table_index, TRUE); 113 } else { 114 /* 115 * On error, delete any namespace objects created by this table. 116 * We cannot initialize these objects, so delete them. There are 117 * a couple of expecially bad cases: 118 * AE_ALREADY_EXISTS - namespace collision. 119 * AE_NOT_FOUND - the target of a Scope operator does not 120 * exist. This target of Scope must already exist in the 121 * namespace, as per the ACPI specification. 122 */ 123 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 124 acpi_ns_delete_namespace_by_owner(acpi_gbl_root_table_list. 125 tables[table_index].owner_id); 126 acpi_tb_release_owner_id(table_index); 127 128 return_ACPI_STATUS(status); 129 } 130 131 unlock: 132 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 133 134 if (ACPI_FAILURE(status)) { 135 return_ACPI_STATUS(status); 136 } 137 138 /* 139 * Now we can parse the control methods. We always parse 140 * them here for a sanity check, and if configured for 141 * just-in-time parsing, we delete the control method 142 * parse trees. 143 */ 144 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 145 "**** Begin Table Object Initialization\n")); 146 147 status = acpi_ds_initialize_objects(table_index, node); 148 149 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 150 "**** Completed Table Object Initialization\n")); 151 152 return_ACPI_STATUS(status); 153 } 154 155 #ifdef ACPI_OBSOLETE_FUNCTIONS 156 /******************************************************************************* 157 * 158 * FUNCTION: acpi_load_namespace 159 * 160 * PARAMETERS: None 161 * 162 * RETURN: Status 163 * 164 * DESCRIPTION: Load the name space from what ever is pointed to by DSDT. 165 * (DSDT points to either the BIOS or a buffer.) 166 * 167 ******************************************************************************/ 168 169 acpi_status acpi_ns_load_namespace(void) 170 { 171 acpi_status status; 172 173 ACPI_FUNCTION_TRACE(acpi_load_name_space); 174 175 /* There must be at least a DSDT installed */ 176 177 if (acpi_gbl_DSDT == NULL) { 178 ACPI_ERROR((AE_INFO, "DSDT is not in memory")); 179 return_ACPI_STATUS(AE_NO_ACPI_TABLES); 180 } 181 182 /* 183 * Load the namespace. The DSDT is required, 184 * but the SSDT and PSDT tables are optional. 185 */ 186 status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT); 187 if (ACPI_FAILURE(status)) { 188 return_ACPI_STATUS(status); 189 } 190 191 /* Ignore exceptions from these */ 192 193 (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT); 194 (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT); 195 196 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, 197 "ACPI Namespace successfully loaded at root %p\n", 198 acpi_gbl_root_node)); 199 200 return_ACPI_STATUS(status); 201 } 202 #endif 203 204 #ifdef ACPI_FUTURE_IMPLEMENTATION 205 /******************************************************************************* 206 * 207 * FUNCTION: acpi_ns_delete_subtree 208 * 209 * PARAMETERS: start_handle - Handle in namespace where search begins 210 * 211 * RETURNS Status 212 * 213 * DESCRIPTION: Walks the namespace starting at the given handle and deletes 214 * all objects, entries, and scopes in the entire subtree. 215 * 216 * Namespace/Interpreter should be locked or the subsystem should 217 * be in shutdown before this routine is called. 218 * 219 ******************************************************************************/ 220 221 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle) 222 { 223 acpi_status status; 224 acpi_handle child_handle; 225 acpi_handle parent_handle; 226 acpi_handle next_child_handle; 227 acpi_handle dummy; 228 u32 level; 229 230 ACPI_FUNCTION_TRACE(ns_delete_subtree); 231 232 parent_handle = start_handle; 233 child_handle = NULL; 234 level = 1; 235 236 /* 237 * Traverse the tree of objects until we bubble back up 238 * to where we started. 239 */ 240 while (level > 0) { 241 242 /* Attempt to get the next object in this scope */ 243 244 status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle, 245 child_handle, &next_child_handle); 246 247 child_handle = next_child_handle; 248 249 /* Did we get a new object? */ 250 251 if (ACPI_SUCCESS(status)) { 252 253 /* Check if this object has any children */ 254 255 if (ACPI_SUCCESS 256 (acpi_get_next_object 257 (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) { 258 /* 259 * There is at least one child of this object, 260 * visit the object 261 */ 262 level++; 263 parent_handle = child_handle; 264 child_handle = NULL; 265 } 266 } else { 267 /* 268 * No more children in this object, go back up to 269 * the object's parent 270 */ 271 level--; 272 273 /* Delete all children now */ 274 275 acpi_ns_delete_children(child_handle); 276 277 child_handle = parent_handle; 278 status = acpi_get_parent(parent_handle, &parent_handle); 279 if (ACPI_FAILURE(status)) { 280 return_ACPI_STATUS(status); 281 } 282 } 283 } 284 285 /* Now delete the starting object, and we are done */ 286 287 acpi_ns_remove_node(child_handle); 288 return_ACPI_STATUS(AE_OK); 289 } 290 291 /******************************************************************************* 292 * 293 * FUNCTION: acpi_ns_unload_name_space 294 * 295 * PARAMETERS: handle - Root of namespace subtree to be deleted 296 * 297 * RETURN: Status 298 * 299 * DESCRIPTION: Shrinks the namespace, typically in response to an undocking 300 * event. Deletes an entire subtree starting from (and 301 * including) the given handle. 302 * 303 ******************************************************************************/ 304 305 acpi_status acpi_ns_unload_namespace(acpi_handle handle) 306 { 307 acpi_status status; 308 309 ACPI_FUNCTION_TRACE(ns_unload_name_space); 310 311 /* Parameter validation */ 312 313 if (!acpi_gbl_root_node) { 314 return_ACPI_STATUS(AE_NO_NAMESPACE); 315 } 316 317 if (!handle) { 318 return_ACPI_STATUS(AE_BAD_PARAMETER); 319 } 320 321 /* This function does the real work */ 322 323 status = acpi_ns_delete_subtree(handle); 324 325 return_ACPI_STATUS(status); 326 } 327 #endif 328 #endif 329