drivers/acpi/namespace/nsload.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsload - namespace loading/expanding/contracting procedures
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, 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 <acpi/acnamesp.h>
  46 #include <acpi/acdispat.h>
  47 #include <acpi/actables.h>
  48
  49 #define _COMPONENT          ACPI_NAMESPACE
  50 ACPI_MODULE_NAME("nsload")
  51
  52 /* Local prototypes */
  53 #ifdef ACPI_FUTURE_IMPLEMENTATION
  54 acpi_status acpi_ns_unload_namespace(acpi_handle handle);
  55
  56 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle);
  57 #endif
  58
  59 #ifndef ACPI_NO_METHOD_EXECUTION
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    acpi_ns_load_table
  63  *
  64  * PARAMETERS:  table_index     - Index for table to be loaded
  65  *              Node            - Owning NS node
  66  *
  67  * RETURN:      Status
  68  *
  69  * DESCRIPTION: Load one ACPI table into the namespace
  70  *
  71  ******************************************************************************/
  72
  73 acpi_status
  74 acpi_ns_load_table(u32 table_index, struct acpi_namespace_node *node)
  75 {
  76         acpi_status status;
  77
  78         ACPI_FUNCTION_TRACE(ns_load_table);
  79
  80         /*
  81          * Parse the table and load the namespace with all named
  82          * objects found within.  Control methods are NOT parsed
  83          * at this time.  In fact, the control methods cannot be
  84          * parsed until the entire namespace is loaded, because
  85          * if a control method makes a forward reference (call)
  86          * to another control method, we can't continue parsing
  87          * because we don't know how many arguments to parse next!
  88          */
  89         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  90         if (ACPI_FAILURE(status)) {
  91                 return_ACPI_STATUS(status);
  92         }
  93
  94         /* If table already loaded into namespace, just return */
  95
  96         if (acpi_tb_is_table_loaded(table_index)) {
  97                 status = AE_ALREADY_EXISTS;
  98                 goto unlock;
  99         }
 100
 101         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 102                           "**** Loading table into namespace ****\n"));
 103
 104         status = acpi_tb_allocate_owner_id(table_index);
 105         if (ACPI_FAILURE(status)) {
 106                 goto unlock;
 107         }
 108
 109         status = acpi_ns_parse_table(table_index, node);
 110         if (ACPI_SUCCESS(status)) {
 111                 acpi_tb_set_table_loaded_flag(table_index, TRUE);
 112         } else {
 113                 (void)acpi_tb_release_owner_id(table_index);
 114         }
 115
 116       unlock:
 117         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 118
 119         if (ACPI_FAILURE(status)) {
 120                 return_ACPI_STATUS(status);
 121         }
 122
 123         /*
 124          * Now we can parse the control methods.  We always parse
 125          * them here for a sanity check, and if configured for
 126          * just-in-time parsing, we delete the control method
 127          * parse trees.
 128          */
 129         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 130                           "**** Begin Table Method Parsing and Object Initialization ****\n"));
 131
 132         status = acpi_ds_initialize_objects(table_index, node);
 133
 134         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 135                           "**** Completed Table Method Parsing and Object Initialization ****\n"));
 136
 137         return_ACPI_STATUS(status);
 138 }
 139
 140 #ifdef ACPI_OBSOLETE_FUNCTIONS
 141 /*******************************************************************************
 142  *
 143  * FUNCTION:    acpi_load_namespace
 144  *
 145  * PARAMETERS:  None
 146  *
 147  * RETURN:      Status
 148  *
 149  * DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
 150  *              (DSDT points to either the BIOS or a buffer.)
 151  *
 152  ******************************************************************************/
 153
 154 acpi_status acpi_ns_load_namespace(void)
 155 {
 156         acpi_status status;
 157
 158         ACPI_FUNCTION_TRACE(acpi_load_name_space);
 159
 160         /* There must be at least a DSDT installed */
 161
 162         if (acpi_gbl_DSDT == NULL) {
 163                 ACPI_ERROR((AE_INFO, "DSDT is not in memory"));
 164                 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
 165         }
 166
 167         /*
 168          * Load the namespace.  The DSDT is required,
 169          * but the SSDT and PSDT tables are optional.
 170          */
 171         status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT);
 172         if (ACPI_FAILURE(status)) {
 173                 return_ACPI_STATUS(status);
 174         }
 175
 176         /* Ignore exceptions from these */
 177
 178         (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT);
 179         (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT);
 180
 181         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 182                               "ACPI Namespace successfully loaded at root %p\n",
 183                               acpi_gbl_root_node));
 184
 185         return_ACPI_STATUS(status);
 186 }
 187 #endif
 188
 189 #ifdef ACPI_FUTURE_IMPLEMENTATION
 190 /*******************************************************************************
 191  *
 192  * FUNCTION:    acpi_ns_delete_subtree
 193  *
 194  * PARAMETERS:  start_handle        - Handle in namespace where search begins
 195  *
 196  * RETURNS      Status
 197  *
 198  * DESCRIPTION: Walks the namespace starting at the given handle and deletes
 199  *              all objects, entries, and scopes in the entire subtree.
 200  *
 201  *              Namespace/Interpreter should be locked or the subsystem should
 202  *              be in shutdown before this routine is called.
 203  *
 204  ******************************************************************************/
 205
 206 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle)
 207 {
 208         acpi_status status;
 209         acpi_handle child_handle;
 210         acpi_handle parent_handle;
 211         acpi_handle next_child_handle;
 212         acpi_handle dummy;
 213         u32 level;
 214
 215         ACPI_FUNCTION_TRACE(ns_delete_subtree);
 216
 217         parent_handle = start_handle;
 218         child_handle = NULL;
 219         level = 1;
 220
 221         /*
 222          * Traverse the tree of objects until we bubble back up
 223          * to where we started.
 224          */
 225         while (level > 0) {
 226
 227                 /* Attempt to get the next object in this scope */
 228
 229                 status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle,
 230                                               child_handle, &next_child_handle);
 231
 232                 child_handle = next_child_handle;
 233
 234                 /* Did we get a new object? */
 235
 236                 if (ACPI_SUCCESS(status)) {
 237
 238                         /* Check if this object has any children */
 239
 240                         if (ACPI_SUCCESS
 241                             (acpi_get_next_object
 242                              (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) {
 243                                 /*
 244                                  * There is at least one child of this object,
 245                                  * visit the object
 246                                  */
 247                                 level++;
 248                                 parent_handle = child_handle;
 249                                 child_handle = NULL;
 250                         }
 251                 } else {
 252                         /*
 253                          * No more children in this object, go back up to
 254                          * the object's parent
 255                          */
 256                         level--;
 257
 258                         /* Delete all children now */
 259
 260                         acpi_ns_delete_children(child_handle);
 261
 262                         child_handle = parent_handle;
 263                         status = acpi_get_parent(parent_handle, &parent_handle);
 264                         if (ACPI_FAILURE(status)) {
 265                                 return_ACPI_STATUS(status);
 266                         }
 267                 }
 268         }
 269
 270         /* Now delete the starting object, and we are done */
 271
 272         acpi_ns_delete_node(child_handle);
 273
 274         return_ACPI_STATUS(AE_OK);
 275 }
 276
 277 /*******************************************************************************
 278  *
 279  *  FUNCTION:       acpi_ns_unload_name_space
 280  *
 281  *  PARAMETERS:     Handle          - Root of namespace subtree to be deleted
 282  *
 283  *  RETURN:         Status
 284  *
 285  *  DESCRIPTION:    Shrinks the namespace, typically in response to an undocking
 286  *                  event.  Deletes an entire subtree starting from (and
 287  *                  including) the given handle.
 288  *
 289  ******************************************************************************/
 290
 291 acpi_status acpi_ns_unload_namespace(acpi_handle handle)
 292 {
 293         acpi_status status;
 294
 295         ACPI_FUNCTION_TRACE(ns_unload_name_space);
 296
 297         /* Parameter validation */
 298
 299         if (!acpi_gbl_root_node) {
 300                 return_ACPI_STATUS(AE_NO_NAMESPACE);
 301         }
 302
 303         if (!handle) {
 304                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 305         }
 306
 307         /* This function does the real work */
 308
 309         status = acpi_ns_delete_subtree(handle);
 310
 311         return_ACPI_STATUS(status);
 312 }
 313 #endif
 314 #endif