drivers/acpi/acpica/nsalloc.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: nsalloc - Namespace allocation and deletion utilities
   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
  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. All node deletions must come through
 100  *              here. Detaches any attached objects, including any attached
 101  *              data. If a handler is associated with attached data, it is
 102  *              invoked before the node is deleted.
 103  *
 104  ******************************************************************************/
 105
 106 void acpi_ns_delete_node(struct acpi_namespace_node *node)
 107 {
 108         union acpi_operand_object *obj_desc;
 109         union acpi_operand_object *next_desc;
 110
 111         ACPI_FUNCTION_NAME(ns_delete_node);
 112
 113         /* Detach an object if there is one */
 114
 115         acpi_ns_detach_object(node);
 116
 117         /*
 118          * Delete an attached data object list if present (objects that were
 119          * attached via acpi_attach_data). Note: After any normal object is
 120          * detached above, the only possible remaining object(s) are data
 121          * objects, in a linked list.
 122          */
 123         obj_desc = node->object;
 124         while (obj_desc && (obj_desc->common.type == ACPI_TYPE_LOCAL_DATA)) {
 125
 126                 /* Invoke the attached data deletion handler if present */
 127
 128                 if (obj_desc->data.handler) {
 129                         obj_desc->data.handler(node, obj_desc->data.pointer);
 130                 }
 131
 132                 next_desc = obj_desc->common.next_object;
 133                 acpi_ut_remove_reference(obj_desc);
 134                 obj_desc = next_desc;
 135         }
 136
 137         /* Special case for the statically allocated root node */
 138
 139         if (node == acpi_gbl_root_node) {
 140                 return;
 141         }
 142
 143         /* Now we can delete the node */
 144
 145         (void)acpi_os_release_object(acpi_gbl_namespace_cache, node);
 146
 147         ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++);
 148         ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Node %p, Remaining %X\n",
 149                           node, acpi_gbl_current_node_count));
 150 }
 151
 152 /*******************************************************************************
 153  *
 154  * FUNCTION:    acpi_ns_remove_node
 155  *
 156  * PARAMETERS:  node            - Node to be removed/deleted
 157  *
 158  * RETURN:      None
 159  *
 160  * DESCRIPTION: Remove (unlink) and delete a namespace node
 161  *
 162  ******************************************************************************/
 163
 164 void acpi_ns_remove_node(struct acpi_namespace_node *node)
 165 {
 166         struct acpi_namespace_node *parent_node;
 167         struct acpi_namespace_node *prev_node;
 168         struct acpi_namespace_node *next_node;
 169
 170         ACPI_FUNCTION_TRACE_PTR(ns_remove_node, node);
 171
 172         parent_node = node->parent;
 173
 174         prev_node = NULL;
 175         next_node = parent_node->child;
 176
 177         /* Find the node that is the previous peer in the parent's child list */
 178
 179         while (next_node != node) {
 180                 prev_node = next_node;
 181                 next_node = next_node->peer;
 182         }
 183
 184         if (prev_node) {
 185
 186                 /* Node is not first child, unlink it */
 187
 188                 prev_node->peer = node->peer;
 189         } else {
 190                 /*
 191                  * Node is first child (has no previous peer).
 192                  * Link peer list to parent
 193                  */
 194                 parent_node->child = node->peer;
 195         }
 196
 197         /* Delete the node and any attached objects */
 198
 199         acpi_ns_delete_node(node);
 200         return_VOID;
 201 }
 202
 203 /*******************************************************************************
 204  *
 205  * FUNCTION:    acpi_ns_install_node
 206  *
 207  * PARAMETERS:  walk_state      - Current state of the walk
 208  *              parent_node     - The parent of the new Node
 209  *              node            - The new Node to install
 210  *              type            - ACPI object type of the new Node
 211  *
 212  * RETURN:      None
 213  *
 214  * DESCRIPTION: Initialize a new namespace node and install it amongst
 215  *              its peers.
 216  *
 217  *              Note: Current namespace lookup is linear search. This appears
 218  *              to be sufficient as namespace searches consume only a small
 219  *              fraction of the execution time of the ACPI subsystem.
 220  *
 221  ******************************************************************************/
 222
 223 void acpi_ns_install_node(struct acpi_walk_state *walk_state, struct acpi_namespace_node *parent_node,  /* Parent */
 224                           struct acpi_namespace_node *node,     /* New Child */
 225                           acpi_object_type type)
 226 {
 227         acpi_owner_id owner_id = 0;
 228         struct acpi_namespace_node *child_node;
 229
 230         ACPI_FUNCTION_TRACE(ns_install_node);
 231
 232         if (walk_state) {
 233                 /*
 234                  * Get the owner ID from the Walk state. The owner ID is used to
 235                  * track table deletion and deletion of objects created by methods.
 236                  */
 237                 owner_id = walk_state->owner_id;
 238
 239                 if ((walk_state->method_desc) &&
 240                     (parent_node != walk_state->method_node)) {
 241                         /*
 242                          * A method is creating a new node that is not a child of the
 243                          * method (it is non-local). Mark the executing method as having
 244                          * modified the namespace. This is used for cleanup when the
 245                          * method exits.
 246                          */
 247                         walk_state->method_desc->method.info_flags |=
 248                             ACPI_METHOD_MODIFIED_NAMESPACE;
 249                 }
 250         }
 251
 252         /* Link the new entry into the parent and existing children */
 253
 254         node->peer = NULL;
 255         node->parent = parent_node;
 256         child_node = parent_node->child;
 257
 258         if (!child_node) {
 259                 parent_node->child = node;
 260         } else {
 261                 /* Add node to the end of the peer list */
 262
 263                 while (child_node->peer) {
 264                         child_node = child_node->peer;
 265                 }
 266
 267                 child_node->peer = node;
 268         }
 269
 270         /* Init the new entry */
 271
 272         node->owner_id = owner_id;
 273         node->type = (u8) type;
 274
 275         ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 276                           "%4.4s (%s) [Node %p Owner %X] added to %4.4s (%s) [Node %p]\n",
 277                           acpi_ut_get_node_name(node),
 278                           acpi_ut_get_type_name(node->type), node, owner_id,
 279                           acpi_ut_get_node_name(parent_node),
 280                           acpi_ut_get_type_name(parent_node->type),
 281                           parent_node));
 282
 283         return_VOID;
 284 }
 285
 286 /*******************************************************************************
 287  *
 288  * FUNCTION:    acpi_ns_delete_children
 289  *
 290  * PARAMETERS:  parent_node     - Delete this objects children
 291  *
 292  * RETURN:      None.
 293  *
 294  * DESCRIPTION: Delete all children of the parent object. In other words,
 295  *              deletes a "scope".
 296  *
 297  ******************************************************************************/
 298
 299 void acpi_ns_delete_children(struct acpi_namespace_node *parent_node)
 300 {
 301         struct acpi_namespace_node *next_node;
 302         struct acpi_namespace_node *node_to_delete;
 303
 304         ACPI_FUNCTION_TRACE_PTR(ns_delete_children, parent_node);
 305
 306         if (!parent_node) {
 307                 return_VOID;
 308         }
 309
 310         /* Deallocate all children at this level */
 311
 312         next_node = parent_node->child;
 313         while (next_node) {
 314
 315                 /* Grandchildren should have all been deleted already */
 316
 317                 if (next_node->child) {
 318                         ACPI_ERROR((AE_INFO, "Found a grandchild! P=%p C=%p",
 319                                     parent_node, next_node));
 320                 }
 321
 322                 /*
 323                  * Delete this child node and move on to the next child in the list.
 324                  * No need to unlink the node since we are deleting the entire branch.
 325                  */
 326                 node_to_delete = next_node;
 327                 next_node = next_node->peer;
 328                 acpi_ns_delete_node(node_to_delete);
 329         };
 330
 331         /* Clear the parent's child pointer */
 332
 333         parent_node->child = NULL;
 334         return_VOID;
 335 }
 336
 337 /*******************************************************************************
 338  *
 339  * FUNCTION:    acpi_ns_delete_namespace_subtree
 340  *
 341  * PARAMETERS:  parent_node     - Root of the subtree to be deleted
 342  *
 343  * RETURN:      None.
 344  *
 345  * DESCRIPTION: Delete a subtree of the namespace. This includes all objects
 346  *              stored within the subtree.
 347  *
 348  ******************************************************************************/
 349
 350 void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node)
 351 {
 352         struct acpi_namespace_node *child_node = NULL;
 353         u32 level = 1;
 354         acpi_status status;
 355
 356         ACPI_FUNCTION_TRACE(ns_delete_namespace_subtree);
 357
 358         if (!parent_node) {
 359                 return_VOID;
 360         }
 361
 362         /* Lock namespace for possible update */
 363
 364         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 365         if (ACPI_FAILURE(status)) {
 366                 return_VOID;
 367         }
 368
 369         /*
 370          * Traverse the tree of objects until we bubble back up
 371          * to where we started.
 372          */
 373         while (level > 0) {
 374
 375                 /* Get the next node in this scope (NULL if none) */
 376
 377                 child_node = acpi_ns_get_next_node(parent_node, child_node);
 378                 if (child_node) {
 379
 380                         /* Found a child node - detach any attached object */
 381
 382                         acpi_ns_detach_object(child_node);
 383
 384                         /* Check if this node has any children */
 385
 386                         if (child_node->child) {
 387                                 /*
 388                                  * There is at least one child of this node,
 389                                  * visit the node
 390                                  */
 391                                 level++;
 392                                 parent_node = child_node;
 393                                 child_node = NULL;
 394                         }
 395                 } else {
 396                         /*
 397                          * No more children of this parent node.
 398                          * Move up to the grandparent.
 399                          */
 400                         level--;
 401
 402                         /*
 403                          * Now delete all of the children of this parent
 404                          * all at the same time.
 405                          */
 406                         acpi_ns_delete_children(parent_node);
 407
 408                         /* New "last child" is this parent node */
 409
 410                         child_node = parent_node;
 411
 412                         /* Move up the tree to the grandparent */
 413
 414                         parent_node = parent_node->parent;
 415                 }
 416         }
 417
 418         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 419         return_VOID;
 420 }
 421
 422 /*******************************************************************************
 423  *
 424  * FUNCTION:    acpi_ns_delete_namespace_by_owner
 425  *
 426  * PARAMETERS:  owner_id    - All nodes with this owner will be deleted
 427  *
 428  * RETURN:      Status
 429  *
 430  * DESCRIPTION: Delete entries within the namespace that are owned by a
 431  *              specific ID. Used to delete entire ACPI tables. All
 432  *              reference counts are updated.
 433  *
 434  * MUTEX:       Locks namespace during deletion walk.
 435  *
 436  ******************************************************************************/
 437
 438 void acpi_ns_delete_namespace_by_owner(acpi_owner_id owner_id)
 439 {
 440         struct acpi_namespace_node *child_node;
 441         struct acpi_namespace_node *deletion_node;
 442         struct acpi_namespace_node *parent_node;
 443         u32 level;
 444         acpi_status status;
 445
 446         ACPI_FUNCTION_TRACE_U32(ns_delete_namespace_by_owner, owner_id);
 447
 448         if (owner_id == 0) {
 449                 return_VOID;
 450         }
 451
 452         /* Lock namespace for possible update */
 453
 454         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 455         if (ACPI_FAILURE(status)) {
 456                 return_VOID;
 457         }
 458
 459         deletion_node = NULL;
 460         parent_node = acpi_gbl_root_node;
 461         child_node = NULL;
 462         level = 1;
 463
 464         /*
 465          * Traverse the tree of nodes until we bubble back up
 466          * to where we started.
 467          */
 468         while (level > 0) {
 469                 /*
 470                  * Get the next child of this parent node. When child_node is NULL,
 471                  * the first child of the parent is returned
 472                  */
 473                 child_node = acpi_ns_get_next_node(parent_node, child_node);
 474
 475                 if (deletion_node) {
 476                         acpi_ns_delete_children(deletion_node);
 477                         acpi_ns_remove_node(deletion_node);
 478                         deletion_node = NULL;
 479                 }
 480
 481                 if (child_node) {
 482                         if (child_node->owner_id == owner_id) {
 483
 484                                 /* Found a matching child node - detach any attached object */
 485
 486                                 acpi_ns_detach_object(child_node);
 487                         }
 488
 489                         /* Check if this node has any children */
 490
 491                         if (child_node->child) {
 492                                 /*
 493                                  * There is at least one child of this node,
 494                                  * visit the node
 495                                  */
 496                                 level++;
 497                                 parent_node = child_node;
 498                                 child_node = NULL;
 499                         } else if (child_node->owner_id == owner_id) {
 500                                 deletion_node = child_node;
 501                         }
 502                 } else {
 503                         /*
 504                          * No more children of this parent node.
 505                          * Move up to the grandparent.
 506                          */
 507                         level--;
 508                         if (level != 0) {
 509                                 if (parent_node->owner_id == owner_id) {
 510                                         deletion_node = parent_node;
 511                                 }
 512                         }
 513
 514                         /* New "last child" is this parent node */
 515
 516                         child_node = parent_node;
 517
 518                         /* Move up the tree to the grandparent */
 519
 520                         parent_node = parent_node->parent;
 521                 }
 522         }
 523
 524         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 525         return_VOID;
 526 }