drivers/acpi/acpica/nsload.c

   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         return_ACPI_STATUS(status);
 325 }
 326 #endif
 327 #endif