git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/namespace/nsalloc.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: nsalloc - Namespace allocation and deletion utilities
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2006, R. Byron Moore
   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
  47 #define _COMPONENT          ACPI_NAMESPACE
  48 ACPI_MODULE_NAME("nsalloc")
  49
  50 /*******************************************************************************
  51  *
  52  * FUNCTION:    acpi_ns_create_node
  53  *
  54  * PARAMETERS:  Name            - Name of the new node (4 char ACPI name)
  55  *
  56  * RETURN:      New namespace node (Null on failure)
  57  *
  58  * DESCRIPTION: Create a namespace node
  59  *
  60  ******************************************************************************/
  61 struct acpi_namespace_node *acpi_ns_create_node(u32 name)
  62 {
  63         struct acpi_namespace_node *node;
  64
  65         ACPI_FUNCTION_TRACE(ns_create_node);
  66
  67         node = acpi_os_acquire_object(acpi_gbl_namespace_cache);
  68         if (!node) {
  69                 return_PTR(NULL);
  70         }
  71
  72         ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_allocated++);
  73
  74         node->name.integer = name;
  75         ACPI_SET_DESCRIPTOR_TYPE(node, ACPI_DESC_TYPE_NAMED);
  76         return_PTR(node);
  77 }
  78
  79 /*******************************************************************************
  80  *
  81  * FUNCTION:    acpi_ns_delete_node
  82  *
  83  * PARAMETERS:  Node            - Node to be deleted
  84  *
  85  * RETURN:      None
  86  *
  87  * DESCRIPTION: Delete a namespace node
  88  *
  89  ******************************************************************************/
  90
  91 void acpi_ns_delete_node(struct acpi_namespace_node *node)
  92 {
  93         struct acpi_namespace_node *parent_node;
  94         struct acpi_namespace_node *prev_node;
  95         struct acpi_namespace_node *next_node;
  96
  97         ACPI_FUNCTION_TRACE_PTR(ns_delete_node, node);
  98
  99         parent_node = acpi_ns_get_parent_node(node);
 100
 101         prev_node = NULL;
 102         next_node = parent_node->child;
 103
 104         /* Find the node that is the previous peer in the parent's child list */
 105
 106         while (next_node != node) {
 107                 prev_node = next_node;
 108                 next_node = prev_node->peer;
 109         }
 110
 111         if (prev_node) {
 112
 113                 /* Node is not first child, unlink it */
 114
 115                 prev_node->peer = next_node->peer;
 116                 if (next_node->flags & ANOBJ_END_OF_PEER_LIST) {
 117                         prev_node->flags |= ANOBJ_END_OF_PEER_LIST;
 118                 }
 119         } else {
 120                 /* Node is first child (has no previous peer) */
 121
 122                 if (next_node->flags & ANOBJ_END_OF_PEER_LIST) {
 123
 124                         /* No peers at all */
 125
 126                         parent_node->child = NULL;
 127                 } else {        /* Link peer list to parent */
 128
 129                         parent_node->child = next_node->peer;
 130                 }
 131         }
 132
 133         ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++);
 134
 135         /*
 136          * Detach an object if there is one, then delete the node
 137          */
 138         acpi_ns_detach_object(node);
 139         (void)acpi_os_release_object(acpi_gbl_namespace_cache, node);
 140         return_VOID;
 141 }
 142
 143 /*******************************************************************************
 144  *
 145  * FUNCTION:    acpi_ns_install_node
 146  *
 147  * PARAMETERS:  walk_state      - Current state of the walk
 148  *              parent_node     - The parent of the new Node
 149  *              Node            - The new Node to install
 150  *              Type            - ACPI object type of the new Node
 151  *
 152  * RETURN:      None
 153  *
 154  * DESCRIPTION: Initialize a new namespace node and install it amongst
 155  *              its peers.
 156  *
 157  *              Note: Current namespace lookup is linear search. This appears
 158  *              to be sufficient as namespace searches consume only a small
 159  *              fraction of the execution time of the ACPI subsystem.
 160  *
 161  ******************************************************************************/
 162
 163 void acpi_ns_install_node(struct acpi_walk_state *walk_state, struct acpi_namespace_node *parent_node,  /* Parent */
 164                           struct acpi_namespace_node *node,     /* New Child */
 165                           acpi_object_type type)
 166 {
 167         acpi_owner_id owner_id = 0;
 168         struct acpi_namespace_node *child_node;
 169
 170         ACPI_FUNCTION_TRACE(ns_install_node);
 171
 172         /*
 173          * Get the owner ID from the Walk state
 174          * The owner ID is used to track table deletion and
 175          * deletion of objects created by methods
 176          */
 177         if (walk_state) {
 178                 owner_id = walk_state->owner_id;
 179         }
 180
 181         /* Link the new entry into the parent and existing children */
 182
 183         child_node = parent_node->child;
 184         if (!child_node) {
 185                 parent_node->child = node;
 186                 node->flags |= ANOBJ_END_OF_PEER_LIST;
 187                 node->peer = parent_node;
 188         } else {
 189                 while (!(child_node->flags & ANOBJ_END_OF_PEER_LIST)) {
 190                         child_node = child_node->peer;
 191                 }
 192
 193                 child_node->peer = node;
 194
 195                 /* Clear end-of-list flag */
 196
 197                 child_node->flags &= ~ANOBJ_END_OF_PEER_LIST;
 198                 node->flags |= ANOBJ_END_OF_PEER_LIST;
 199                 node->peer = parent_node;
 200         }
 201
 202         /* Init the new entry */
 203
 204         node->owner_id = owner_id;
 205         node->type = (u8) type;
 206
 207         ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 208                           "%4.4s (%s) [Node %p Owner %X] added to %4.4s (%s) [Node %p]\n",
 209                           acpi_ut_get_node_name(node),
 210                           acpi_ut_get_type_name(node->type), node, owner_id,
 211                           acpi_ut_get_node_name(parent_node),
 212                           acpi_ut_get_type_name(parent_node->type),
 213                           parent_node));
 214
 215         return_VOID;
 216 }
 217
 218 /*******************************************************************************
 219  *
 220  * FUNCTION:    acpi_ns_delete_children
 221  *
 222  * PARAMETERS:  parent_node     - Delete this objects children
 223  *
 224  * RETURN:      None.
 225  *
 226  * DESCRIPTION: Delete all children of the parent object. In other words,
 227  *              deletes a "scope".
 228  *
 229  ******************************************************************************/
 230
 231 void acpi_ns_delete_children(struct acpi_namespace_node *parent_node)
 232 {
 233         struct acpi_namespace_node *child_node;
 234         struct acpi_namespace_node *next_node;
 235         u8 flags;
 236
 237         ACPI_FUNCTION_TRACE_PTR(ns_delete_children, parent_node);
 238
 239         if (!parent_node) {
 240                 return_VOID;
 241         }
 242
 243         /* If no children, all done! */
 244
 245         child_node = parent_node->child;
 246         if (!child_node) {
 247                 return_VOID;
 248         }
 249
 250         /*
 251          * Deallocate all children at this level
 252          */
 253         do {
 254
 255                 /* Get the things we need */
 256
 257                 next_node = child_node->peer;
 258                 flags = child_node->flags;
 259
 260                 /* Grandchildren should have all been deleted already */
 261
 262                 if (child_node->child) {
 263                         ACPI_ERROR((AE_INFO, "Found a grandchild! P=%p C=%p",
 264                                     parent_node, child_node));
 265                 }
 266
 267                 /* Now we can free this child object */
 268
 269                 ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++);
 270
 271                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 272                                   "Object %p, Remaining %X\n", child_node,
 273                                   acpi_gbl_current_node_count));
 274
 275                 /*
 276                  * Detach an object if there is one, then free the child node
 277                  */
 278                 acpi_ns_detach_object(child_node);
 279
 280                 /* Now we can delete the node */
 281
 282                 (void)acpi_os_release_object(acpi_gbl_namespace_cache,
 283                                              child_node);
 284
 285                 /* And move on to the next child in the list */
 286
 287                 child_node = next_node;
 288
 289         } while (!(flags & ANOBJ_END_OF_PEER_LIST));
 290
 291         /* Clear the parent's child pointer */
 292
 293         parent_node->child = NULL;
 294
 295         return_VOID;
 296 }
 297
 298 /*******************************************************************************
 299  *
 300  * FUNCTION:    acpi_ns_delete_namespace_subtree
 301  *
 302  * PARAMETERS:  parent_node     - Root of the subtree to be deleted
 303  *
 304  * RETURN:      None.
 305  *
 306  * DESCRIPTION: Delete a subtree of the namespace.  This includes all objects
 307  *              stored within the subtree.
 308  *
 309  ******************************************************************************/
 310
 311 void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node)
 312 {
 313         struct acpi_namespace_node *child_node = NULL;
 314         u32 level = 1;
 315
 316         ACPI_FUNCTION_TRACE(ns_delete_namespace_subtree);
 317
 318         if (!parent_node) {
 319                 return_VOID;
 320         }
 321
 322         /*
 323          * Traverse the tree of objects until we bubble back up
 324          * to where we started.
 325          */
 326         while (level > 0) {
 327
 328                 /* Get the next node in this scope (NULL if none) */
 329
 330                 child_node =
 331                     acpi_ns_get_next_node(ACPI_TYPE_ANY, parent_node,
 332                                           child_node);
 333                 if (child_node) {
 334
 335                         /* Found a child node - detach any attached object */
 336
 337                         acpi_ns_detach_object(child_node);
 338
 339                         /* Check if this node has any children */
 340
 341                         if (acpi_ns_get_next_node
 342                             (ACPI_TYPE_ANY, child_node, NULL)) {
 343                                 /*
 344                                  * There is at least one child of this node,
 345                                  * visit the node
 346                                  */
 347                                 level++;
 348                                 parent_node = child_node;
 349                                 child_node = NULL;
 350                         }
 351                 } else {
 352                         /*
 353                          * No more children of this parent node.
 354                          * Move up to the grandparent.
 355                          */
 356                         level--;
 357
 358                         /*
 359                          * Now delete all of the children of this parent
 360                          * all at the same time.
 361                          */
 362                         acpi_ns_delete_children(parent_node);
 363
 364                         /* New "last child" is this parent node */
 365
 366                         child_node = parent_node;
 367
 368                         /* Move up the tree to the grandparent */
 369
 370                         parent_node = acpi_ns_get_parent_node(parent_node);
 371                 }
 372         }
 373
 374         return_VOID;
 375 }
 376
 377 /*******************************************************************************
 378  *
 379  * FUNCTION:    acpi_ns_delete_namespace_by_owner
 380  *
 381  * PARAMETERS:  owner_id    - All nodes with this owner will be deleted
 382  *
 383  * RETURN:      Status
 384  *
 385  * DESCRIPTION: Delete entries within the namespace that are owned by a
 386  *              specific ID.  Used to delete entire ACPI tables.  All
 387  *              reference counts are updated.
 388  *
 389  * MUTEX:       Locks namespace during deletion walk.
 390  *
 391  ******************************************************************************/
 392
 393 void acpi_ns_delete_namespace_by_owner(acpi_owner_id owner_id)
 394 {
 395         struct acpi_namespace_node *child_node;
 396         struct acpi_namespace_node *deletion_node;
 397         struct acpi_namespace_node *parent_node;
 398         u32 level;
 399         acpi_status status;
 400
 401         ACPI_FUNCTION_TRACE_U32(ns_delete_namespace_by_owner, owner_id);
 402
 403         if (owner_id == 0) {
 404                 return_VOID;
 405         }
 406
 407         /* Lock namespace for possible update */
 408
 409         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 410         if (ACPI_FAILURE(status)) {
 411                 return_VOID;
 412         }
 413
 414         deletion_node = NULL;
 415         parent_node = acpi_gbl_root_node;
 416         child_node = NULL;
 417         level = 1;
 418
 419         /*
 420          * Traverse the tree of nodes until we bubble back up
 421          * to where we started.
 422          */
 423         while (level > 0) {
 424                 /*
 425                  * Get the next child of this parent node. When child_node is NULL,
 426                  * the first child of the parent is returned
 427                  */
 428                 child_node =
 429                     acpi_ns_get_next_node(ACPI_TYPE_ANY, parent_node,
 430                                           child_node);
 431
 432                 if (deletion_node) {
 433                         acpi_ns_delete_children(deletion_node);
 434                         acpi_ns_delete_node(deletion_node);
 435                         deletion_node = NULL;
 436                 }
 437
 438                 if (child_node) {
 439                         if (child_node->owner_id == owner_id) {
 440
 441                                 /* Found a matching child node - detach any attached object */
 442
 443                                 acpi_ns_detach_object(child_node);
 444                         }
 445
 446                         /* Check if this node has any children */
 447
 448                         if (acpi_ns_get_next_node
 449                             (ACPI_TYPE_ANY, child_node, NULL)) {
 450                                 /*
 451                                  * There is at least one child of this node,
 452                                  * visit the node
 453                                  */
 454                                 level++;
 455                                 parent_node = child_node;
 456                                 child_node = NULL;
 457                         } else if (child_node->owner_id == owner_id) {
 458                                 deletion_node = child_node;
 459                         }
 460                 } else {
 461                         /*
 462                          * No more children of this parent node.
 463                          * Move up to the grandparent.
 464                          */
 465                         level--;
 466                         if (level != 0) {
 467                                 if (parent_node->owner_id == owner_id) {
 468                                         deletion_node = parent_node;
 469                                 }
 470                         }
 471
 472                         /* New "last child" is this parent node */
 473
 474                         child_node = parent_node;
 475
 476                         /* Move up the tree to the grandparent */
 477
 478                         parent_node = acpi_ns_get_parent_node(parent_node);
 479                 }
 480         }
 481
 482         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 483         return_VOID;
 484 }