drivers/acpi/acpica/nsload.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsload - namespace loading/expanding/contracting procedures
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, 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 #include "acinterp.h"
  50
  51 #define _COMPONENT          ACPI_NAMESPACE
  52 ACPI_MODULE_NAME("nsload")
  53
  54 /* Local prototypes */
  55 #ifdef ACPI_FUTURE_IMPLEMENTATION
  56 acpi_status acpi_ns_unload_namespace(acpi_handle handle);
  57
  58 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle);
  59 #endif
  60
  61 #ifndef ACPI_NO_METHOD_EXECUTION
  62 /*******************************************************************************
  63  *
  64  * FUNCTION:    acpi_ns_load_table
  65  *
  66  * PARAMETERS:  table_index     - Index for table to be loaded
  67  *              node            - Owning NS node
  68  *
  69  * RETURN:      Status
  70  *
  71  * DESCRIPTION: Load one ACPI table into the namespace
  72  *
  73  ******************************************************************************/
  74
  75 acpi_status
  76 acpi_ns_load_table(u32 table_index, struct acpi_namespace_node *node)
  77 {
  78         acpi_status status;
  79
  80         ACPI_FUNCTION_TRACE(ns_load_table);
  81
  82         /* If table already loaded into namespace, just return */
  83
  84         if (acpi_tb_is_table_loaded(table_index)) {
  85                 status = AE_ALREADY_EXISTS;
  86                 goto unlock;
  87         }
  88
  89         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  90                           "**** Loading table into namespace ****\n"));
  91
  92         status = acpi_tb_allocate_owner_id(table_index);
  93         if (ACPI_FAILURE(status)) {
  94                 goto unlock;
  95         }
  96
  97         /*
  98          * Parse the table and load the namespace with all named
  99          * objects found within. Control methods are NOT parsed
 100          * at this time. In fact, the control methods cannot be
 101          * parsed until the entire namespace is loaded, because
 102          * if a control method makes a forward reference (call)
 103          * to another control method, we can't continue parsing
 104          * because we don't know how many arguments to parse next!
 105          */
 106         status = acpi_ns_parse_table(table_index, node);
 107         if (ACPI_SUCCESS(status)) {
 108                 acpi_tb_set_table_loaded_flag(table_index, TRUE);
 109         } else {
 110                 /*
 111                  * On error, delete any namespace objects created by this table.
 112                  * We cannot initialize these objects, so delete them. There are
 113                  * a couple of expecially bad cases:
 114                  * AE_ALREADY_EXISTS - namespace collision.
 115                  * AE_NOT_FOUND - the target of a Scope operator does not
 116                  * exist. This target of Scope must already exist in the
 117                  * namespace, as per the ACPI specification.
 118                  */
 119                 acpi_ns_delete_namespace_by_owner(acpi_gbl_root_table_list.
 120                                                   tables[table_index].owner_id);
 121
 122                 acpi_tb_release_owner_id(table_index);
 123                 return_ACPI_STATUS(status);
 124         }
 125
 126 unlock:
 127         if (ACPI_FAILURE(status)) {
 128                 return_ACPI_STATUS(status);
 129         }
 130
 131         /*
 132          * Now we can parse the control methods. We always parse
 133          * them here for a sanity check, and if configured for
 134          * just-in-time parsing, we delete the control method
 135          * parse trees.
 136          */
 137         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 138                           "**** Begin Table Object Initialization\n"));
 139
 140         acpi_ex_enter_interpreter();
 141         status = acpi_ds_initialize_objects(table_index, node);
 142         acpi_ex_exit_interpreter();
 143
 144         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 145                           "**** Completed Table Object Initialization\n"));
 146
 147         /*
 148          * Execute any module-level code that was detected during the table load
 149          * phase. Although illegal since ACPI 2.0, there are many machines that
 150          * contain this type of code. Each block of detected executable AML code
 151          * outside of any control method is wrapped with a temporary control
 152          * method object and placed on a global list. The methods on this list
 153          * are executed below.
 154          *
 155          * This case executes the module-level code for each table immediately
 156          * after the table has been loaded. This provides compatibility with
 157          * other ACPI implementations. Optionally, the execution can be deferred
 158          * until later, see acpi_initialize_objects.
 159          */
 160         if (!acpi_gbl_parse_table_as_term_list
 161             && !acpi_gbl_group_module_level_code) {
 162                 acpi_ns_exec_module_code_list();
 163         }
 164
 165         return_ACPI_STATUS(status);
 166 }
 167
 168 #ifdef ACPI_OBSOLETE_FUNCTIONS
 169 /*******************************************************************************
 170  *
 171  * FUNCTION:    acpi_load_namespace
 172  *
 173  * PARAMETERS:  None
 174  *
 175  * RETURN:      Status
 176  *
 177  * DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
 178  *              (DSDT points to either the BIOS or a buffer.)
 179  *
 180  ******************************************************************************/
 181
 182 acpi_status acpi_ns_load_namespace(void)
 183 {
 184         acpi_status status;
 185
 186         ACPI_FUNCTION_TRACE(acpi_load_name_space);
 187
 188         /* There must be at least a DSDT installed */
 189
 190         if (acpi_gbl_DSDT == NULL) {
 191                 ACPI_ERROR((AE_INFO, "DSDT is not in memory"));
 192                 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
 193         }
 194
 195         /*
 196          * Load the namespace. The DSDT is required,
 197          * but the SSDT and PSDT tables are optional.
 198          */
 199         status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT);
 200         if (ACPI_FAILURE(status)) {
 201                 return_ACPI_STATUS(status);
 202         }
 203
 204         /* Ignore exceptions from these */
 205
 206         (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT);
 207         (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT);
 208
 209         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 210                               "ACPI Namespace successfully loaded at root %p\n",
 211                               acpi_gbl_root_node));
 212
 213         return_ACPI_STATUS(status);
 214 }
 215 #endif
 216
 217 #ifdef ACPI_FUTURE_IMPLEMENTATION
 218 /*******************************************************************************
 219  *
 220  * FUNCTION:    acpi_ns_delete_subtree
 221  *
 222  * PARAMETERS:  start_handle        - Handle in namespace where search begins
 223  *
 224  * RETURNS      Status
 225  *
 226  * DESCRIPTION: Walks the namespace starting at the given handle and deletes
 227  *              all objects, entries, and scopes in the entire subtree.
 228  *
 229  *              Namespace/Interpreter should be locked or the subsystem should
 230  *              be in shutdown before this routine is called.
 231  *
 232  ******************************************************************************/
 233
 234 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle)
 235 {
 236         acpi_status status;
 237         acpi_handle child_handle;
 238         acpi_handle parent_handle;
 239         acpi_handle next_child_handle;
 240         acpi_handle dummy;
 241         u32 level;
 242
 243         ACPI_FUNCTION_TRACE(ns_delete_subtree);
 244
 245         parent_handle = start_handle;
 246         child_handle = NULL;
 247         level = 1;
 248
 249         /*
 250          * Traverse the tree of objects until we bubble back up
 251          * to where we started.
 252          */
 253         while (level > 0) {
 254
 255                 /* Attempt to get the next object in this scope */
 256
 257                 status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle,
 258                                               child_handle, &next_child_handle);
 259
 260                 child_handle = next_child_handle;
 261
 262                 /* Did we get a new object? */
 263
 264                 if (ACPI_SUCCESS(status)) {
 265
 266                         /* Check if this object has any children */
 267
 268                         if (ACPI_SUCCESS
 269                             (acpi_get_next_object
 270                              (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) {
 271                                 /*
 272                                  * There is at least one child of this object,
 273                                  * visit the object
 274                                  */
 275                                 level++;
 276                                 parent_handle = child_handle;
 277                                 child_handle = NULL;
 278                         }
 279                 } else {
 280                         /*
 281                          * No more children in this object, go back up to
 282                          * the object's parent
 283                          */
 284                         level--;
 285
 286                         /* Delete all children now */
 287
 288                         acpi_ns_delete_children(child_handle);
 289
 290                         child_handle = parent_handle;
 291                         status = acpi_get_parent(parent_handle, &parent_handle);
 292                         if (ACPI_FAILURE(status)) {
 293                                 return_ACPI_STATUS(status);
 294                         }
 295                 }
 296         }
 297
 298         /* Now delete the starting object, and we are done */
 299
 300         acpi_ns_remove_node(child_handle);
 301         return_ACPI_STATUS(AE_OK);
 302 }
 303
 304 /*******************************************************************************
 305  *
 306  *  FUNCTION:       acpi_ns_unload_name_space
 307  *
 308  *  PARAMETERS:     handle          - Root of namespace subtree to be deleted
 309  *
 310  *  RETURN:         Status
 311  *
 312  *  DESCRIPTION:    Shrinks the namespace, typically in response to an undocking
 313  *                  event. Deletes an entire subtree starting from (and
 314  *                  including) the given handle.
 315  *
 316  ******************************************************************************/
 317
 318 acpi_status acpi_ns_unload_namespace(acpi_handle handle)
 319 {
 320         acpi_status status;
 321
 322         ACPI_FUNCTION_TRACE(ns_unload_name_space);
 323
 324         /* Parameter validation */
 325
 326         if (!acpi_gbl_root_node) {
 327                 return_ACPI_STATUS(AE_NO_NAMESPACE);
 328         }
 329
 330         if (!handle) {
 331                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 332         }
 333
 334         /* This function does the real work */
 335
 336         status = acpi_ns_delete_subtree(handle);
 337         return_ACPI_STATUS(status);
 338 }
 339 #endif
 340 #endif