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

   1 /*******************************************************************************
   2  *
   3  * Module Name: nsalloc - Namespace allocation and deletion utilities
   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 "accommon.h"
  46 #include "acnamesp.h"
  47
  48 #define _COMPONENT          ACPI_NAMESPACE
  49 ACPI_MODULE_NAME("nsalloc")
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    acpi_ns_create_node
  54  *
  55  * PARAMETERS:  Name            - Name of the new node (4 char ACPI name)
  56  *
  57  * RETURN:      New namespace node (Null on failure)
  58  *
  59  * DESCRIPTION: Create a namespace node
  60  *
  61  ******************************************************************************/
  62 struct acpi_namespace_node *acpi_ns_create_node(u32 name)
  63 {
  64         struct acpi_namespace_node *node;
  65 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
  66         u32 temp;
  67 #endif
  68
  69         ACPI_FUNCTION_TRACE(ns_create_node);
  70
  71         node = acpi_os_acquire_object(acpi_gbl_namespace_cache);
  72         if (!node) {
  73                 return_PTR(NULL);
  74         }
  75
  76         ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_allocated++);
  77
  78 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
  79         temp = acpi_gbl_ns_node_list->total_allocated -
  80             acpi_gbl_ns_node_list->total_freed;
  81         if (temp > acpi_gbl_ns_node_list->max_occupied) {
  82                 acpi_gbl_ns_node_list->max_occupied = temp;
  83         }
  84 #endif
  85
  86         node->name.integer = name;
  87         ACPI_SET_DESCRIPTOR_TYPE(node, ACPI_DESC_TYPE_NAMED);
  88         return_PTR(node);
  89 }
  90
  91 /*******************************************************************************
  92  *
  93  * FUNCTION:    acpi_ns_delete_node
  94  *
  95  * PARAMETERS:  Node            - Node to be deleted
  96  *
  97  * RETURN:      None
  98  *
  99  * DESCRIPTION: Delete a namespace node
 100  *
 101  ******************************************************************************/
 102
 103 void acpi_ns_delete_node(struct acpi_namespace_node *node)
 104 {
 105         struct acpi_namespace_node *parent_node;
 106         struct acpi_namespace_node *prev_node;
 107         struct acpi_namespace_node *next_node;
 108
 109         ACPI_FUNCTION_TRACE_PTR(ns_delete_node, node);
 110
 111         parent_node = acpi_ns_get_parent_node(node);
 112
 113         prev_node = NULL;
 114         next_node = parent_node->child;
 115
 116         /* Find the node that is the previous peer in the parent's child list */
 117
 118         while (next_node != node) {
 119                 prev_node = next_node;
 120                 next_node = prev_node->peer;
 121         }
 122
 123         if (prev_node) {
 124
 125                 /* Node is not first child, unlink it */
 126
 127                 prev_node->peer = next_node->peer;
 128                 if (next_node->flags & ANOBJ_END_OF_PEER_LIST) {
 129                         prev_node->flags |= ANOBJ_END_OF_PEER_LIST;
 130                 }
 131         } else {
 132                 /* Node is first child (has no previous peer) */
 133
 134                 if (next_node->flags & ANOBJ_END_OF_PEER_LIST) {
 135
 136                         /* No peers at all */
 137
 138                         parent_node->child = NULL;
 139                 } else {        /* Link peer list to parent */
 140
 141                         parent_node->child = next_node->peer;
 142                 }
 143         }
 144
 145         ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++);
 146
 147         /* Detach an object if there is one, then delete the node */
 148
 149         acpi_ns_detach_object(node);
 150         (void)acpi_os_release_object(acpi_gbl_namespace_cache, node);
 151         return_VOID;
 152 }
 153
 154 /*******************************************************************************
 155  *
 156  * FUNCTION:    acpi_ns_install_node
 157  *
 158  * PARAMETERS:  walk_state      - Current state of the walk
 159  *              parent_node     - The parent of the new Node
 160  *              Node            - The new Node to install
 161  *              Type            - ACPI object type of the new Node
 162  *
 163  * RETURN:      None
 164  *
 165  * DESCRIPTION: Initialize a new namespace node and install it amongst
 166  *              its peers.
 167  *
 168  *              Note: Current namespace lookup is linear search. This appears
 169  *              to be sufficient as namespace searches consume only a small
 170  *              fraction of the execution time of the ACPI subsystem.
 171  *
 172  ******************************************************************************/
 173
 174 void acpi_ns_install_node(struct acpi_walk_state *walk_state, struct acpi_namespace_node *parent_node,  /* Parent */
 175                           struct acpi_namespace_node *node,     /* New Child */
 176                           acpi_object_type type)
 177 {
 178         acpi_owner_id owner_id = 0;
 179         struct acpi_namespace_node *child_node;
 180
 181         ACPI_FUNCTION_TRACE(ns_install_node);
 182
 183         /*
 184          * Get the owner ID from the Walk state. The owner ID is used to track
 185          * table deletion and deletion of objects created by methods.
 186          */
 187         if (walk_state) {
 188                 owner_id = walk_state->owner_id;
 189         }
 190
 191         /* Link the new entry into the parent and existing children */
 192
 193         child_node = parent_node->child;
 194         if (!child_node) {
 195                 parent_node->child = node;
 196                 node->flags |= ANOBJ_END_OF_PEER_LIST;
 197                 node->peer = parent_node;
 198         } else {
 199                 while (!(child_node->flags & ANOBJ_END_OF_PEER_LIST)) {
 200                         child_node = child_node->peer;
 201                 }
 202
 203                 child_node->peer = node;
 204
 205                 /* Clear end-of-list flag */
 206
 207                 child_node->flags &= ~ANOBJ_END_OF_PEER_LIST;
 208                 node->flags |= ANOBJ_END_OF_PEER_LIST;
 209                 node->peer = parent_node;
 210         }
 211
 212         /* Init the new entry */
 213
 214         node->owner_id = owner_id;
 215         node->type = (u8) type;
 216
 217         ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 218                           "%4.4s (%s) [Node %p Owner %X] added to %4.4s (%s) [Node %p]\n",
 219                           acpi_ut_get_node_name(node),
 220                           acpi_ut_get_type_name(node->type), node, owner_id,
 221                           acpi_ut_get_node_name(parent_node),
 222                           acpi_ut_get_type_name(parent_node->type),
 223                           parent_node));
 224
 225         return_VOID;
 226 }
 227
 228 /*******************************************************************************
 229  *
 230  * FUNCTION:    acpi_ns_delete_children
 231  *
 232  * PARAMETERS:  parent_node     - Delete this objects children
 233  *
 234  * RETURN:      None.
 235  *
 236  * DESCRIPTION: Delete all children of the parent object. In other words,
 237  *              deletes a "scope".
 238  *
 239  ******************************************************************************/
 240
 241 void acpi_ns_delete_children(struct acpi_namespace_node *parent_node)
 242 {
 243         struct acpi_namespace_node *child_node;
 244         struct acpi_namespace_node *next_node;
 245         u8 flags;
 246
 247         ACPI_FUNCTION_TRACE_PTR(ns_delete_children, parent_node);
 248
 249         if (!parent_node) {
 250                 return_VOID;
 251         }
 252
 253         /* If no children, all done! */
 254
 255         child_node = parent_node->child;
 256         if (!child_node) {
 257                 return_VOID;
 258         }
 259
 260         /* Deallocate all children at this level */
 261
 262         do {
 263
 264                 /* Get the things we need */
 265
 266                 next_node = child_node->peer;
 267                 flags = child_node->flags;
 268
 269                 /* Grandchildren should have all been deleted already */
 270
 271                 if (child_node->child) {
 272                         ACPI_ERROR((AE_INFO, "Found a grandchild! P=%p C=%p",
 273                                     parent_node, child_node));
 274                 }
 275
 276                 /* Now we can free this child object */
 277
 278                 ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++);
 279
 280                 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 281                                   "Object %p, Remaining %X\n", child_node,
 282                                   acpi_gbl_current_node_count));
 283
 284                 /* Detach an object if there is one, then free the child node */
 285
 286                 acpi_ns_detach_object(child_node);
 287
 288                 /* Now we can delete the node */
 289
 290                 (void)acpi_os_release_object(acpi_gbl_namespace_cache,
 291                                              child_node);
 292
 293                 /* And move on to the next child in the list */
 294
 295                 child_node = next_node;
 296
 297         } while (!(flags & ANOBJ_END_OF_PEER_LIST));
 298
 299         /* Clear the parent's child pointer */
 300
 301         parent_node->child = NULL;
 302         return_VOID;
 303 }
 304
 305 /*******************************************************************************
 306  *
 307  * FUNCTION:    acpi_ns_delete_namespace_subtree
 308  *
 309  * PARAMETERS:  parent_node     - Root of the subtree to be deleted
 310  *
 311  * RETURN:      None.
 312  *
 313  * DESCRIPTION: Delete a subtree of the namespace.  This includes all objects
 314  *              stored within the subtree.
 315  *
 316  ******************************************************************************/
 317
 318 void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node)
 319 {
 320         struct acpi_namespace_node *child_node = NULL;
 321         u32 level = 1;
 322
 323         ACPI_FUNCTION_TRACE(ns_delete_namespace_subtree);
 324
 325         if (!parent_node) {
 326                 return_VOID;
 327         }
 328
 329         /*
 330          * Traverse the tree of objects until we bubble back up
 331          * to where we started.
 332          */
 333         while (level > 0) {
 334
 335                 /* Get the next node in this scope (NULL if none) */
 336
 337                 child_node = acpi_ns_get_next_node(parent_node, child_node);
 338                 if (child_node) {
 339
 340                         /* Found a child node - detach any attached object */
 341
 342                         acpi_ns_detach_object(child_node);
 343
 344                         /* Check if this node has any children */
 345
 346                         if (child_node->child) {
 347                                 /*
 348                                  * There is at least one child of this node,
 349                                  * visit the node
 350                                  */
 351                                 level++;
 352                                 parent_node = child_node;
 353                                 child_node = NULL;
 354                         }
 355                 } else {
 356                         /*
 357                          * No more children of this parent node.
 358                          * Move up to the grandparent.
 359                          */
 360                         level--;
 361
 362                         /*
 363                          * Now delete all of the children of this parent
 364                          * all at the same time.
 365                          */
 366                         acpi_ns_delete_children(parent_node);
 367
 368                         /* New "last child" is this parent node */
 369
 370                         child_node = parent_node;
 371
 372                         /* Move up the tree to the grandparent */
 373
 374                         parent_node = acpi_ns_get_parent_node(parent_node);
 375                 }
 376         }
 377
 378         return_VOID;
 379 }
 380
 381 /*******************************************************************************
 382  *
 383  * FUNCTION:    acpi_ns_delete_namespace_by_owner
 384  *
 385  * PARAMETERS:  owner_id    - All nodes with this owner will be deleted
 386  *
 387  * RETURN:      Status
 388  *
 389  * DESCRIPTION: Delete entries within the namespace that are owned by a
 390  *              specific ID.  Used to delete entire ACPI tables.  All
 391  *              reference counts are updated.
 392  *
 393  * MUTEX:       Locks namespace during deletion walk.
 394  *
 395  ******************************************************************************/
 396
 397 void acpi_ns_delete_namespace_by_owner(acpi_owner_id owner_id)
 398 {
 399         struct acpi_namespace_node *child_node;
 400         struct acpi_namespace_node *deletion_node;
 401         struct acpi_namespace_node *parent_node;
 402         u32 level;
 403         acpi_status status;
 404
 405         ACPI_FUNCTION_TRACE_U32(ns_delete_namespace_by_owner, owner_id);
 406
 407         if (owner_id == 0) {
 408                 return_VOID;
 409         }
 410
 411         /* Lock namespace for possible update */
 412
 413         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 414         if (ACPI_FAILURE(status)) {
 415                 return_VOID;
 416         }
 417
 418         deletion_node = NULL;
 419         parent_node = acpi_gbl_root_node;
 420         child_node = NULL;
 421         level = 1;
 422
 423         /*
 424          * Traverse the tree of nodes until we bubble back up
 425          * to where we started.
 426          */
 427         while (level > 0) {
 428                 /*
 429                  * Get the next child of this parent node. When child_node is NULL,
 430                  * the first child of the parent is returned
 431                  */
 432                 child_node = acpi_ns_get_next_node(parent_node, child_node);
 433
 434                 if (deletion_node) {
 435                         acpi_ns_delete_children(deletion_node);
 436                         acpi_ns_delete_node(deletion_node);
 437                         deletion_node = NULL;
 438                 }
 439
 440                 if (child_node) {
 441                         if (child_node->owner_id == owner_id) {
 442
 443                                 /* Found a matching child node - detach any attached object */
 444
 445                                 acpi_ns_detach_object(child_node);
 446                         }
 447
 448                         /* Check if this node has any children */
 449
 450                         if (child_node->child) {
 451                                 /*
 452                                  * There is at least one child of this node,
 453                                  * visit the node
 454                                  */
 455                                 level++;
 456                                 parent_node = child_node;
 457                                 child_node = NULL;
 458                         } else if (child_node->owner_id == owner_id) {
 459                                 deletion_node = child_node;
 460                         }
 461                 } else {
 462                         /*
 463                          * No more children of this parent node.
 464                          * Move up to the grandparent.
 465                          */
 466                         level--;
 467                         if (level != 0) {
 468                                 if (parent_node->owner_id == owner_id) {
 469                                         deletion_node = parent_node;
 470                                 }
 471                         }
 472
 473                         /* New "last child" is this parent node */
 474
 475                         child_node = parent_node;
 476
 477                         /* Move up the tree to the grandparent */
 478
 479                         parent_node = acpi_ns_get_parent_node(parent_node);
 480                 }
 481         }
 482
 483         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 484         return_VOID;
 485 }