release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/acpi/acpica/nsload.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsload - namespace loading/expanding/contracting procedures
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, 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                 (void)acpi_tb_release_owner_id(table_index);
 115         }
 116
 117       unlock:
 118         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 119
 120         if (ACPI_FAILURE(status)) {
 121                 return_ACPI_STATUS(status);
 122         }
 123
 124         /*
 125          * Now we can parse the control methods.  We always parse
 126          * them here for a sanity check, and if configured for
 127          * just-in-time parsing, we delete the control method
 128          * parse trees.
 129          */
 130         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 131                           "**** Begin Table Method Parsing and Object Initialization\n"));
 132
 133         status = acpi_ds_initialize_objects(table_index, node);
 134
 135         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 136                           "**** Completed Table Method Parsing and Object Initialization\n"));
 137
 138         return_ACPI_STATUS(status);
 139 }
 140
 141 #ifdef ACPI_OBSOLETE_FUNCTIONS
 142 /*******************************************************************************
 143  *
 144  * FUNCTION:    acpi_load_namespace
 145  *
 146  * PARAMETERS:  None
 147  *
 148  * RETURN:      Status
 149  *
 150  * DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
 151  *              (DSDT points to either the BIOS or a buffer.)
 152  *
 153  ******************************************************************************/
 154
 155 acpi_status acpi_ns_load_namespace(void)
 156 {
 157         acpi_status status;
 158
 159         ACPI_FUNCTION_TRACE(acpi_load_name_space);
 160
 161         /* There must be at least a DSDT installed */
 162
 163         if (acpi_gbl_DSDT == NULL) {
 164                 ACPI_ERROR((AE_INFO, "DSDT is not in memory"));
 165                 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
 166         }
 167
 168         /*
 169          * Load the namespace.  The DSDT is required,
 170          * but the SSDT and PSDT tables are optional.
 171          */
 172         status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT);
 173         if (ACPI_FAILURE(status)) {
 174                 return_ACPI_STATUS(status);
 175         }
 176
 177         /* Ignore exceptions from these */
 178
 179         (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT);
 180         (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT);
 181
 182         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 183                               "ACPI Namespace successfully loaded at root %p\n",
 184                               acpi_gbl_root_node));
 185
 186         return_ACPI_STATUS(status);
 187 }
 188 #endif
 189
 190 #ifdef ACPI_FUTURE_IMPLEMENTATION
 191 /*******************************************************************************
 192  *
 193  * FUNCTION:    acpi_ns_delete_subtree
 194  *
 195  * PARAMETERS:  start_handle        - Handle in namespace where search begins
 196  *
 197  * RETURNS      Status
 198  *
 199  * DESCRIPTION: Walks the namespace starting at the given handle and deletes
 200  *              all objects, entries, and scopes in the entire subtree.
 201  *
 202  *              Namespace/Interpreter should be locked or the subsystem should
 203  *              be in shutdown before this routine is called.
 204  *
 205  ******************************************************************************/
 206
 207 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle)
 208 {
 209         acpi_status status;
 210         acpi_handle child_handle;
 211         acpi_handle parent_handle;
 212         acpi_handle next_child_handle;
 213         acpi_handle dummy;
 214         u32 level;
 215
 216         ACPI_FUNCTION_TRACE(ns_delete_subtree);
 217
 218         parent_handle = start_handle;
 219         child_handle = NULL;
 220         level = 1;
 221
 222         /*
 223          * Traverse the tree of objects until we bubble back up
 224          * to where we started.
 225          */
 226         while (level > 0) {
 227
 228                 /* Attempt to get the next object in this scope */
 229
 230                 status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle,
 231                                               child_handle, &next_child_handle);
 232
 233                 child_handle = next_child_handle;
 234
 235                 /* Did we get a new object? */
 236
 237                 if (ACPI_SUCCESS(status)) {
 238
 239                         /* Check if this object has any children */
 240
 241                         if (ACPI_SUCCESS
 242                             (acpi_get_next_object
 243                              (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) {
 244                                 /*
 245                                  * There is at least one child of this object,
 246                                  * visit the object
 247                                  */
 248                                 level++;
 249                                 parent_handle = child_handle;
 250                                 child_handle = NULL;
 251                         }
 252                 } else {
 253                         /*
 254                          * No more children in this object, go back up to
 255                          * the object's parent
 256                          */
 257                         level--;
 258
 259                         /* Delete all children now */
 260
 261                         acpi_ns_delete_children(child_handle);
 262
 263                         child_handle = parent_handle;
 264                         status = acpi_get_parent(parent_handle, &parent_handle);
 265                         if (ACPI_FAILURE(status)) {
 266                                 return_ACPI_STATUS(status);
 267                         }
 268                 }
 269         }
 270
 271         /* Now delete the starting object, and we are done */
 272
 273         acpi_ns_remove_node(child_handle);
 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