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         acpi_ex_enter_interpreter();
  83
  84         /*
  85          * Parse the table and load the namespace with all named
  86          * objects found within. Control methods are NOT parsed
  87          * at this time. In fact, the control methods cannot be
  88          * parsed until the entire namespace is loaded, because
  89          * if a control method makes a forward reference (call)
  90          * to another control method, we can't continue parsing
  91          * because we don't know how many arguments to parse next!
  92          */
  93         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  94         if (ACPI_FAILURE(status)) {
  95                 goto unlock_interp;
  96         }
  97
  98         /* If table already loaded into namespace, just return */
  99
 100         if (acpi_tb_is_table_loaded(table_index)) {
 101                 status = AE_ALREADY_EXISTS;
 102                 goto unlock;
 103         }
 104
 105         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 106                           "**** Loading table into namespace ****\n"));
 107
 108         status = acpi_tb_allocate_owner_id(table_index);
 109         if (ACPI_FAILURE(status)) {
 110                 goto unlock;
 111         }
 112
 113         status = acpi_ns_parse_table(table_index, node);
 114         if (ACPI_SUCCESS(status)) {
 115                 acpi_tb_set_table_loaded_flag(table_index, TRUE);
 116         } else {
 117                 /*
 118                  * On error, delete any namespace objects created by this table.
 119                  * We cannot initialize these objects, so delete them. There are
 120                  * a couple of expecially bad cases:
 121                  * AE_ALREADY_EXISTS - namespace collision.
 122                  * AE_NOT_FOUND - the target of a Scope operator does not
 123                  * exist. This target of Scope must already exist in the
 124                  * namespace, as per the ACPI specification.
 125                  */
 126                 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 127                 acpi_ns_delete_namespace_by_owner(acpi_gbl_root_table_list.
 128                                                   tables[table_index].owner_id);
 129
 130                 acpi_tb_release_owner_id(table_index);
 131                 return_ACPI_STATUS(status);
 132         }
 133
 134 unlock:
 135         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 136 unlock_interp:
 137         (void)acpi_ex_exit_interpreter();
 138
 139         if (ACPI_FAILURE(status)) {
 140                 return_ACPI_STATUS(status);
 141         }
 142
 143         /*
 144          * Now we can parse the control methods. We always parse
 145          * them here for a sanity check, and if configured for
 146          * just-in-time parsing, we delete the control method
 147          * parse trees.
 148          */
 149         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 150                           "**** Begin Table Object Initialization\n"));
 151
 152         status = acpi_ds_initialize_objects(table_index, node);
 153
 154         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 155                           "**** Completed Table Object Initialization\n"));
 156
 157         /*
 158          * Execute any module-level code that was detected during the table load
 159          * phase. Although illegal since ACPI 2.0, there are many machines that
 160          * contain this type of code. Each block of detected executable AML code
 161          * outside of any control method is wrapped with a temporary control
 162          * method object and placed on a global list. The methods on this list
 163          * are executed below.
 164          *
 165          * This case executes the module-level code for each table immediately
 166          * after the table has been loaded. This provides compatibility with
 167          * other ACPI implementations. Optionally, the execution can be deferred
 168          * until later, see acpi_initialize_objects.
 169          */
 170         if (!acpi_gbl_group_module_level_code) {
 171                 acpi_ns_exec_module_code_list();
 172         }
 173
 174         return_ACPI_STATUS(status);
 175 }
 176
 177 #ifdef ACPI_OBSOLETE_FUNCTIONS
 178 /*******************************************************************************
 179  *
 180  * FUNCTION:    acpi_load_namespace
 181  *
 182  * PARAMETERS:  None
 183  *
 184  * RETURN:      Status
 185  *
 186  * DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
 187  *              (DSDT points to either the BIOS or a buffer.)
 188  *
 189  ******************************************************************************/
 190
 191 acpi_status acpi_ns_load_namespace(void)
 192 {
 193         acpi_status status;
 194
 195         ACPI_FUNCTION_TRACE(acpi_load_name_space);
 196
 197         /* There must be at least a DSDT installed */
 198
 199         if (acpi_gbl_DSDT == NULL) {
 200                 ACPI_ERROR((AE_INFO, "DSDT is not in memory"));
 201                 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
 202         }
 203
 204         /*
 205          * Load the namespace. The DSDT is required,
 206          * but the SSDT and PSDT tables are optional.
 207          */
 208         status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT);
 209         if (ACPI_FAILURE(status)) {
 210                 return_ACPI_STATUS(status);
 211         }
 212
 213         /* Ignore exceptions from these */
 214
 215         (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT);
 216         (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT);
 217
 218         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 219                               "ACPI Namespace successfully loaded at root %p\n",
 220                               acpi_gbl_root_node));
 221
 222         return_ACPI_STATUS(status);
 223 }
 224 #endif
 225
 226 #ifdef ACPI_FUTURE_IMPLEMENTATION
 227 /*******************************************************************************
 228  *
 229  * FUNCTION:    acpi_ns_delete_subtree
 230  *
 231  * PARAMETERS:  start_handle        - Handle in namespace where search begins
 232  *
 233  * RETURNS      Status
 234  *
 235  * DESCRIPTION: Walks the namespace starting at the given handle and deletes
 236  *              all objects, entries, and scopes in the entire subtree.
 237  *
 238  *              Namespace/Interpreter should be locked or the subsystem should
 239  *              be in shutdown before this routine is called.
 240  *
 241  ******************************************************************************/
 242
 243 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle)
 244 {
 245         acpi_status status;
 246         acpi_handle child_handle;
 247         acpi_handle parent_handle;
 248         acpi_handle next_child_handle;
 249         acpi_handle dummy;
 250         u32 level;
 251
 252         ACPI_FUNCTION_TRACE(ns_delete_subtree);
 253
 254         parent_handle = start_handle;
 255         child_handle = NULL;
 256         level = 1;
 257
 258         /*
 259          * Traverse the tree of objects until we bubble back up
 260          * to where we started.
 261          */
 262         while (level > 0) {
 263
 264                 /* Attempt to get the next object in this scope */
 265
 266                 status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle,
 267                                               child_handle, &next_child_handle);
 268
 269                 child_handle = next_child_handle;
 270
 271                 /* Did we get a new object? */
 272
 273                 if (ACPI_SUCCESS(status)) {
 274
 275                         /* Check if this object has any children */
 276
 277                         if (ACPI_SUCCESS
 278                             (acpi_get_next_object
 279                              (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) {
 280                                 /*
 281                                  * There is at least one child of this object,
 282                                  * visit the object
 283                                  */
 284                                 level++;
 285                                 parent_handle = child_handle;
 286                                 child_handle = NULL;
 287                         }
 288                 } else {
 289                         /*
 290                          * No more children in this object, go back up to
 291                          * the object's parent
 292                          */
 293                         level--;
 294
 295                         /* Delete all children now */
 296
 297                         acpi_ns_delete_children(child_handle);
 298
 299                         child_handle = parent_handle;
 300                         status = acpi_get_parent(parent_handle, &parent_handle);
 301                         if (ACPI_FAILURE(status)) {
 302                                 return_ACPI_STATUS(status);
 303                         }
 304                 }
 305         }
 306
 307         /* Now delete the starting object, and we are done */
 308
 309         acpi_ns_remove_node(child_handle);
 310         return_ACPI_STATUS(AE_OK);
 311 }
 312
 313 /*******************************************************************************
 314  *
 315  *  FUNCTION:       acpi_ns_unload_name_space
 316  *
 317  *  PARAMETERS:     handle          - Root of namespace subtree to be deleted
 318  *
 319  *  RETURN:         Status
 320  *
 321  *  DESCRIPTION:    Shrinks the namespace, typically in response to an undocking
 322  *                  event. Deletes an entire subtree starting from (and
 323  *                  including) the given handle.
 324  *
 325  ******************************************************************************/
 326
 327 acpi_status acpi_ns_unload_namespace(acpi_handle handle)
 328 {
 329         acpi_status status;
 330
 331         ACPI_FUNCTION_TRACE(ns_unload_name_space);
 332
 333         /* Parameter validation */
 334
 335         if (!acpi_gbl_root_node) {
 336                 return_ACPI_STATUS(AE_NO_NAMESPACE);
 337         }
 338
 339         if (!handle) {
 340                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 341         }
 342
 343         /* This function does the real work */
 344
 345         status = acpi_ns_delete_subtree(handle);
 346         return_ACPI_STATUS(status);
 347 }
 348 #endif
 349 #endif