linux/drivers/acpi/acpica/utdelete.c
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   1/*******************************************************************************
   2 *
   3 * Module Name: utdelete - object deletion and reference count utilities
   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 "acinterp.h"
  47#include "acnamesp.h"
  48#include "acevents.h"
  49
  50#define _COMPONENT          ACPI_UTILITIES
  51ACPI_MODULE_NAME("utdelete")
  52
  53/* Local prototypes */
  54static void acpi_ut_delete_internal_obj(union acpi_operand_object *object);
  55
  56static void
  57acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action);
  58
  59/*******************************************************************************
  60 *
  61 * FUNCTION:    acpi_ut_delete_internal_obj
  62 *
  63 * PARAMETERS:  Object         - Object to be deleted
  64 *
  65 * RETURN:      None
  66 *
  67 * DESCRIPTION: Low level object deletion, after reference counts have been
  68 *              updated (All reference counts, including sub-objects!)
  69 *
  70 ******************************************************************************/
  71
  72static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
  73{
  74        void *obj_pointer = NULL;
  75        union acpi_operand_object *handler_desc;
  76        union acpi_operand_object *second_desc;
  77        union acpi_operand_object *next_desc;
  78        union acpi_operand_object **last_obj_ptr;
  79
  80        ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object);
  81
  82        if (!object) {
  83                return_VOID;
  84        }
  85
  86        /*
  87         * Must delete or free any pointers within the object that are not
  88         * actual ACPI objects (for example, a raw buffer pointer).
  89         */
  90        switch (object->common.type) {
  91        case ACPI_TYPE_STRING:
  92
  93                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
  94                                  "**** String %p, ptr %p\n", object,
  95                                  object->string.pointer));
  96
  97                /* Free the actual string buffer */
  98
  99                if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
 100
 101                        /* But only if it is NOT a pointer into an ACPI table */
 102
 103                        obj_pointer = object->string.pointer;
 104                }
 105                break;
 106
 107        case ACPI_TYPE_BUFFER:
 108
 109                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 110                                  "**** Buffer %p, ptr %p\n", object,
 111                                  object->buffer.pointer));
 112
 113                /* Free the actual buffer */
 114
 115                if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
 116
 117                        /* But only if it is NOT a pointer into an ACPI table */
 118
 119                        obj_pointer = object->buffer.pointer;
 120                }
 121                break;
 122
 123        case ACPI_TYPE_PACKAGE:
 124
 125                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 126                                  " **** Package of count %X\n",
 127                                  object->package.count));
 128
 129                /*
 130                 * Elements of the package are not handled here, they are deleted
 131                 * separately
 132                 */
 133
 134                /* Free the (variable length) element pointer array */
 135
 136                obj_pointer = object->package.elements;
 137                break;
 138
 139                /*
 140                 * These objects have a possible list of notify handlers.
 141                 * Device object also may have a GPE block.
 142                 */
 143        case ACPI_TYPE_DEVICE:
 144
 145                if (object->device.gpe_block) {
 146                        (void)acpi_ev_delete_gpe_block(object->device.
 147                                                       gpe_block);
 148                }
 149
 150                /*lint -fallthrough */
 151
 152        case ACPI_TYPE_PROCESSOR:
 153        case ACPI_TYPE_THERMAL:
 154
 155                /* Walk the notify handler list for this object */
 156
 157                handler_desc = object->common_notify.handler;
 158                while (handler_desc) {
 159                        next_desc = handler_desc->address_space.next;
 160                        acpi_ut_remove_reference(handler_desc);
 161                        handler_desc = next_desc;
 162                }
 163                break;
 164
 165        case ACPI_TYPE_MUTEX:
 166
 167                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 168                                  "***** Mutex %p, OS Mutex %p\n",
 169                                  object, object->mutex.os_mutex));
 170
 171                if (object == acpi_gbl_global_lock_mutex) {
 172
 173                        /* Global Lock has extra semaphore */
 174
 175                        (void)
 176                            acpi_os_delete_semaphore
 177                            (acpi_gbl_global_lock_semaphore);
 178                        acpi_gbl_global_lock_semaphore = NULL;
 179
 180                        acpi_os_delete_mutex(object->mutex.os_mutex);
 181                        acpi_gbl_global_lock_mutex = NULL;
 182                } else {
 183                        acpi_ex_unlink_mutex(object);
 184                        acpi_os_delete_mutex(object->mutex.os_mutex);
 185                }
 186                break;
 187
 188        case ACPI_TYPE_EVENT:
 189
 190                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 191                                  "***** Event %p, OS Semaphore %p\n",
 192                                  object, object->event.os_semaphore));
 193
 194                (void)acpi_os_delete_semaphore(object->event.os_semaphore);
 195                object->event.os_semaphore = NULL;
 196                break;
 197
 198        case ACPI_TYPE_METHOD:
 199
 200                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 201                                  "***** Method %p\n", object));
 202
 203                /* Delete the method mutex if it exists */
 204
 205                if (object->method.mutex) {
 206                        acpi_os_delete_mutex(object->method.mutex->mutex.
 207                                             os_mutex);
 208                        acpi_ut_delete_object_desc(object->method.mutex);
 209                        object->method.mutex = NULL;
 210                }
 211                break;
 212
 213        case ACPI_TYPE_REGION:
 214
 215                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 216                                  "***** Region %p\n", object));
 217
 218                /* Invalidate the region address/length via the host OS */
 219
 220                acpi_os_invalidate_address(object->region.space_id,
 221                                          object->region.address,
 222                                          (acpi_size) object->region.length);
 223
 224                second_desc = acpi_ns_get_secondary_object(object);
 225                if (second_desc) {
 226                        /*
 227                         * Free the region_context if and only if the handler is one of the
 228                         * default handlers -- and therefore, we created the context object
 229                         * locally, it was not created by an external caller.
 230                         */
 231                        handler_desc = object->region.handler;
 232                        if (handler_desc) {
 233                                next_desc =
 234                                    handler_desc->address_space.region_list;
 235                                last_obj_ptr =
 236                                    &handler_desc->address_space.region_list;
 237
 238                                /* Remove the region object from the handler's list */
 239
 240                                while (next_desc) {
 241                                        if (next_desc == object) {
 242                                                *last_obj_ptr =
 243                                                    next_desc->region.next;
 244                                                break;
 245                                        }
 246
 247                                        /* Walk the linked list of handler */
 248
 249                                        last_obj_ptr = &next_desc->region.next;
 250                                        next_desc = next_desc->region.next;
 251                                }
 252
 253                                if (handler_desc->address_space.handler_flags &
 254                                    ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
 255
 256                                        /* Deactivate region and free region context */
 257
 258                                        if (handler_desc->address_space.setup) {
 259                                                (void)handler_desc->
 260                                                    address_space.setup(object,
 261                                                                        ACPI_REGION_DEACTIVATE,
 262                                                                        handler_desc->
 263                                                                        address_space.
 264                                                                        context,
 265                                                                        &second_desc->
 266                                                                        extra.
 267                                                                        region_context);
 268                                        }
 269                                }
 270
 271                                acpi_ut_remove_reference(handler_desc);
 272                        }
 273
 274                        /* Now we can free the Extra object */
 275
 276                        acpi_ut_delete_object_desc(second_desc);
 277                }
 278                break;
 279
 280        case ACPI_TYPE_BUFFER_FIELD:
 281
 282                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 283                                  "***** Buffer Field %p\n", object));
 284
 285                second_desc = acpi_ns_get_secondary_object(object);
 286                if (second_desc) {
 287                        acpi_ut_delete_object_desc(second_desc);
 288                }
 289                break;
 290
 291        case ACPI_TYPE_LOCAL_BANK_FIELD:
 292
 293                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 294                                  "***** Bank Field %p\n", object));
 295
 296                second_desc = acpi_ns_get_secondary_object(object);
 297                if (second_desc) {
 298                        acpi_ut_delete_object_desc(second_desc);
 299                }
 300                break;
 301
 302        default:
 303                break;
 304        }
 305
 306        /* Free any allocated memory (pointer within the object) found above */
 307
 308        if (obj_pointer) {
 309                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 310                                  "Deleting Object Subptr %p\n", obj_pointer));
 311                ACPI_FREE(obj_pointer);
 312        }
 313
 314        /* Now the object can be safely deleted */
 315
 316        ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
 317                          object, acpi_ut_get_object_type_name(object)));
 318
 319        acpi_ut_delete_object_desc(object);
 320        return_VOID;
 321}
 322
 323/*******************************************************************************
 324 *
 325 * FUNCTION:    acpi_ut_delete_internal_object_list
 326 *
 327 * PARAMETERS:  obj_list        - Pointer to the list to be deleted
 328 *
 329 * RETURN:      None
 330 *
 331 * DESCRIPTION: This function deletes an internal object list, including both
 332 *              simple objects and package objects
 333 *
 334 ******************************************************************************/
 335
 336void acpi_ut_delete_internal_object_list(union acpi_operand_object **obj_list)
 337{
 338        union acpi_operand_object **internal_obj;
 339
 340        ACPI_FUNCTION_TRACE(ut_delete_internal_object_list);
 341
 342        /* Walk the null-terminated internal list */
 343
 344        for (internal_obj = obj_list; *internal_obj; internal_obj++) {
 345                acpi_ut_remove_reference(*internal_obj);
 346        }
 347
 348        /* Free the combined parameter pointer list and object array */
 349
 350        ACPI_FREE(obj_list);
 351        return_VOID;
 352}
 353
 354/*******************************************************************************
 355 *
 356 * FUNCTION:    acpi_ut_update_ref_count
 357 *
 358 * PARAMETERS:  Object          - Object whose ref count is to be updated
 359 *              Action          - What to do
 360 *
 361 * RETURN:      New ref count
 362 *
 363 * DESCRIPTION: Modify the ref count and return it.
 364 *
 365 ******************************************************************************/
 366
 367static void
 368acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action)
 369{
 370        u16 count;
 371        u16 new_count;
 372
 373        ACPI_FUNCTION_NAME(ut_update_ref_count);
 374
 375        if (!object) {
 376                return;
 377        }
 378
 379        count = object->common.reference_count;
 380        new_count = count;
 381
 382        /*
 383         * Perform the reference count action (increment, decrement, force delete)
 384         */
 385        switch (action) {
 386        case REF_INCREMENT:
 387
 388                new_count++;
 389                object->common.reference_count = new_count;
 390
 391                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 392                                  "Obj %p Refs=%X, [Incremented]\n",
 393                                  object, new_count));
 394                break;
 395
 396        case REF_DECREMENT:
 397
 398                if (count < 1) {
 399                        ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 400                                          "Obj %p Refs=%X, can't decrement! (Set to 0)\n",
 401                                          object, new_count));
 402
 403                        new_count = 0;
 404                } else {
 405                        new_count--;
 406
 407                        ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 408                                          "Obj %p Refs=%X, [Decremented]\n",
 409                                          object, new_count));
 410                }
 411
 412                if (object->common.type == ACPI_TYPE_METHOD) {
 413                        ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 414                                          "Method Obj %p Refs=%X, [Decremented]\n",
 415                                          object, new_count));
 416                }
 417
 418                object->common.reference_count = new_count;
 419                if (new_count == 0) {
 420                        acpi_ut_delete_internal_obj(object);
 421                }
 422                break;
 423
 424        case REF_FORCE_DELETE:
 425
 426                ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 427                                  "Obj %p Refs=%X, Force delete! (Set to 0)\n",
 428                                  object, count));
 429
 430                new_count = 0;
 431                object->common.reference_count = new_count;
 432                acpi_ut_delete_internal_obj(object);
 433                break;
 434
 435        default:
 436
 437                ACPI_ERROR((AE_INFO, "Unknown action (0x%X)", action));
 438                break;
 439        }
 440
 441        /*
 442         * Sanity check the reference count, for debug purposes only.
 443         * (A deleted object will have a huge reference count)
 444         */
 445        if (count > ACPI_MAX_REFERENCE_COUNT) {
 446                ACPI_WARNING((AE_INFO,
 447                              "Large Reference Count (0x%X) in object %p",
 448                              count, object));
 449        }
 450}
 451
 452/*******************************************************************************
 453 *
 454 * FUNCTION:    acpi_ut_update_object_reference
 455 *
 456 * PARAMETERS:  Object              - Increment ref count for this object
 457 *                                    and all sub-objects
 458 *              Action              - Either REF_INCREMENT or REF_DECREMENT or
 459 *                                    REF_FORCE_DELETE
 460 *
 461 * RETURN:      Status
 462 *
 463 * DESCRIPTION: Increment the object reference count
 464 *
 465 * Object references are incremented when:
 466 * 1) An object is attached to a Node (namespace object)
 467 * 2) An object is copied (all subobjects must be incremented)
 468 *
 469 * Object references are decremented when:
 470 * 1) An object is detached from an Node
 471 *
 472 ******************************************************************************/
 473
 474acpi_status
 475acpi_ut_update_object_reference(union acpi_operand_object *object, u16 action)
 476{
 477        acpi_status status = AE_OK;
 478        union acpi_generic_state *state_list = NULL;
 479        union acpi_operand_object *next_object = NULL;
 480        union acpi_generic_state *state;
 481        u32 i;
 482
 483        ACPI_FUNCTION_TRACE_PTR(ut_update_object_reference, object);
 484
 485        while (object) {
 486
 487                /* Make sure that this isn't a namespace handle */
 488
 489                if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) {
 490                        ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 491                                          "Object %p is NS handle\n", object));
 492                        return_ACPI_STATUS(AE_OK);
 493                }
 494
 495                /*
 496                 * All sub-objects must have their reference count incremented also.
 497                 * Different object types have different subobjects.
 498                 */
 499                switch (object->common.type) {
 500                case ACPI_TYPE_DEVICE:
 501                case ACPI_TYPE_PROCESSOR:
 502                case ACPI_TYPE_POWER:
 503                case ACPI_TYPE_THERMAL:
 504
 505                        /* Update the notify objects for these types (if present) */
 506
 507                        acpi_ut_update_ref_count(object->common_notify.
 508                                                 system_notify, action);
 509                        acpi_ut_update_ref_count(object->common_notify.
 510                                                 device_notify, action);
 511                        break;
 512
 513                case ACPI_TYPE_PACKAGE:
 514                        /*
 515                         * We must update all the sub-objects of the package,
 516                         * each of whom may have their own sub-objects.
 517                         */
 518                        for (i = 0; i < object->package.count; i++) {
 519                                /*
 520                                 * Push each element onto the stack for later processing.
 521                                 * Note: There can be null elements within the package,
 522                                 * these are simply ignored
 523                                 */
 524                                status =
 525                                    acpi_ut_create_update_state_and_push
 526                                    (object->package.elements[i], action,
 527                                     &state_list);
 528                                if (ACPI_FAILURE(status)) {
 529                                        goto error_exit;
 530                                }
 531                        }
 532                        break;
 533
 534                case ACPI_TYPE_BUFFER_FIELD:
 535
 536                        next_object = object->buffer_field.buffer_obj;
 537                        break;
 538
 539                case ACPI_TYPE_LOCAL_REGION_FIELD:
 540
 541                        next_object = object->field.region_obj;
 542                        break;
 543
 544                case ACPI_TYPE_LOCAL_BANK_FIELD:
 545
 546                        next_object = object->bank_field.bank_obj;
 547                        status =
 548                            acpi_ut_create_update_state_and_push(object->
 549                                                                 bank_field.
 550                                                                 region_obj,
 551                                                                 action,
 552                                                                 &state_list);
 553                        if (ACPI_FAILURE(status)) {
 554                                goto error_exit;
 555                        }
 556                        break;
 557
 558                case ACPI_TYPE_LOCAL_INDEX_FIELD:
 559
 560                        next_object = object->index_field.index_obj;
 561                        status =
 562                            acpi_ut_create_update_state_and_push(object->
 563                                                                 index_field.
 564                                                                 data_obj,
 565                                                                 action,
 566                                                                 &state_list);
 567                        if (ACPI_FAILURE(status)) {
 568                                goto error_exit;
 569                        }
 570                        break;
 571
 572                case ACPI_TYPE_LOCAL_REFERENCE:
 573                        /*
 574                         * The target of an Index (a package, string, or buffer) or a named
 575                         * reference must track changes to the ref count of the index or
 576                         * target object.
 577                         */
 578                        if ((object->reference.class == ACPI_REFCLASS_INDEX) ||
 579                            (object->reference.class == ACPI_REFCLASS_NAME)) {
 580                                next_object = object->reference.object;
 581                        }
 582                        break;
 583
 584                case ACPI_TYPE_REGION:
 585                default:
 586                        break;  /* No subobjects for all other types */
 587                }
 588
 589                /*
 590                 * Now we can update the count in the main object. This can only
 591                 * happen after we update the sub-objects in case this causes the
 592                 * main object to be deleted.
 593                 */
 594                acpi_ut_update_ref_count(object, action);
 595                object = NULL;
 596
 597                /* Move on to the next object to be updated */
 598
 599                if (next_object) {
 600                        object = next_object;
 601                        next_object = NULL;
 602                } else if (state_list) {
 603                        state = acpi_ut_pop_generic_state(&state_list);
 604                        object = state->update.object;
 605                        acpi_ut_delete_generic_state(state);
 606                }
 607        }
 608
 609        return_ACPI_STATUS(AE_OK);
 610
 611      error_exit:
 612
 613        ACPI_EXCEPTION((AE_INFO, status,
 614                        "Could not update object reference count"));
 615
 616        /* Free any stacked Update State objects */
 617
 618        while (state_list) {
 619                state = acpi_ut_pop_generic_state(&state_list);
 620                acpi_ut_delete_generic_state(state);
 621        }
 622
 623        return_ACPI_STATUS(status);
 624}
 625
 626/*******************************************************************************
 627 *
 628 * FUNCTION:    acpi_ut_add_reference
 629 *
 630 * PARAMETERS:  Object          - Object whose reference count is to be
 631 *                                incremented
 632 *
 633 * RETURN:      None
 634 *
 635 * DESCRIPTION: Add one reference to an ACPI object
 636 *
 637 ******************************************************************************/
 638
 639void acpi_ut_add_reference(union acpi_operand_object *object)
 640{
 641
 642        ACPI_FUNCTION_TRACE_PTR(ut_add_reference, object);
 643
 644        /* Ensure that we have a valid object */
 645
 646        if (!acpi_ut_valid_internal_object(object)) {
 647                return_VOID;
 648        }
 649
 650        ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 651                          "Obj %p Current Refs=%X [To Be Incremented]\n",
 652                          object, object->common.reference_count));
 653
 654        /* Increment the reference count */
 655
 656        (void)acpi_ut_update_object_reference(object, REF_INCREMENT);
 657        return_VOID;
 658}
 659
 660/*******************************************************************************
 661 *
 662 * FUNCTION:    acpi_ut_remove_reference
 663 *
 664 * PARAMETERS:  Object         - Object whose ref count will be decremented
 665 *
 666 * RETURN:      None
 667 *
 668 * DESCRIPTION: Decrement the reference count of an ACPI internal object
 669 *
 670 ******************************************************************************/
 671
 672void acpi_ut_remove_reference(union acpi_operand_object *object)
 673{
 674
 675        ACPI_FUNCTION_TRACE_PTR(ut_remove_reference, object);
 676
 677        /*
 678         * Allow a NULL pointer to be passed in, just ignore it. This saves
 679         * each caller from having to check. Also, ignore NS nodes.
 680         *
 681         */
 682        if (!object ||
 683            (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED)) {
 684                return_VOID;
 685        }
 686
 687        /* Ensure that we have a valid object */
 688
 689        if (!acpi_ut_valid_internal_object(object)) {
 690                return_VOID;
 691        }
 692
 693        ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 694                          "Obj %p Current Refs=%X [To Be Decremented]\n",
 695                          object, object->common.reference_count));
 696
 697        /*
 698         * Decrement the reference count, and only actually delete the object
 699         * if the reference count becomes 0. (Must also decrement the ref count
 700         * of all subobjects!)
 701         */
 702        (void)acpi_ut_update_object_reference(object, REF_DECREMENT);
 703        return_VOID;
 704}
 705
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