git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/utilities/utobject.c

   1 /******************************************************************************
   2  *
   3  * Module Name: utobject - ACPI object create/delete/size/cache routines
   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 <acpi/acnamesp.h>
  46
  47 #define _COMPONENT          ACPI_UTILITIES
  48 ACPI_MODULE_NAME("utobject")
  49
  50 /* Local prototypes */
  51 static acpi_status
  52 acpi_ut_get_simple_object_size(union acpi_operand_object *obj,
  53                                acpi_size * obj_length);
  54
  55 static acpi_status
  56 acpi_ut_get_package_object_size(union acpi_operand_object *obj,
  57                                 acpi_size * obj_length);
  58
  59 static acpi_status
  60 acpi_ut_get_element_length(u8 object_type,
  61                            union acpi_operand_object *source_object,
  62                            union acpi_generic_state *state, void *context);
  63
  64 /*******************************************************************************
  65  *
  66  * FUNCTION:    acpi_ut_create_internal_object_dbg
  67  *
  68  * PARAMETERS:  module_name         - Source file name of caller
  69  *              line_number         - Line number of caller
  70  *              component_id        - Component type of caller
  71  *              Type                - ACPI Type of the new object
  72  *
  73  * RETURN:      A new internal object, null on failure
  74  *
  75  * DESCRIPTION: Create and initialize a new internal object.
  76  *
  77  * NOTE:        We always allocate the worst-case object descriptor because
  78  *              these objects are cached, and we want them to be
  79  *              one-size-satisifies-any-request.  This in itself may not be
  80  *              the most memory efficient, but the efficiency of the object
  81  *              cache should more than make up for this!
  82  *
  83  ******************************************************************************/
  84
  85 union acpi_operand_object *acpi_ut_create_internal_object_dbg(const char
  86                                                               *module_name,
  87                                                               u32 line_number,
  88                                                               u32 component_id,
  89                                                               acpi_object_type
  90                                                               type)
  91 {
  92         union acpi_operand_object *object;
  93         union acpi_operand_object *second_object;
  94
  95         ACPI_FUNCTION_TRACE_STR(ut_create_internal_object_dbg,
  96                                 acpi_ut_get_type_name(type));
  97
  98         /* Allocate the raw object descriptor */
  99
 100         object =
 101             acpi_ut_allocate_object_desc_dbg(module_name, line_number,
 102                                              component_id);
 103         if (!object) {
 104                 return_PTR(NULL);
 105         }
 106
 107         switch (type) {
 108         case ACPI_TYPE_REGION:
 109         case ACPI_TYPE_BUFFER_FIELD:
 110         case ACPI_TYPE_LOCAL_BANK_FIELD:
 111
 112                 /* These types require a secondary object */
 113
 114                 second_object = acpi_ut_allocate_object_desc_dbg(module_name,
 115                                                                  line_number,
 116                                                                  component_id);
 117                 if (!second_object) {
 118                         acpi_ut_delete_object_desc(object);
 119                         return_PTR(NULL);
 120                 }
 121
 122                 second_object->common.type = ACPI_TYPE_LOCAL_EXTRA;
 123                 second_object->common.reference_count = 1;
 124
 125                 /* Link the second object to the first */
 126
 127                 object->common.next_object = second_object;
 128                 break;
 129
 130         default:
 131                 /* All others have no secondary object */
 132                 break;
 133         }
 134
 135         /* Save the object type in the object descriptor */
 136
 137         object->common.type = (u8) type;
 138
 139         /* Init the reference count */
 140
 141         object->common.reference_count = 1;
 142
 143         /* Any per-type initialization should go here */
 144
 145         return_PTR(object);
 146 }
 147
 148 /*******************************************************************************
 149  *
 150  * FUNCTION:    acpi_ut_create_package_object
 151  *
 152  * PARAMETERS:  Count               - Number of package elements
 153  *
 154  * RETURN:      Pointer to a new Package object, null on failure
 155  *
 156  * DESCRIPTION: Create a fully initialized package object
 157  *
 158  ******************************************************************************/
 159
 160 union acpi_operand_object *acpi_ut_create_package_object(u32 count)
 161 {
 162         union acpi_operand_object *package_desc;
 163         union acpi_operand_object **package_elements;
 164
 165         ACPI_FUNCTION_TRACE_U32(ut_create_package_object, count);
 166
 167         /* Create a new Package object */
 168
 169         package_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
 170         if (!package_desc) {
 171                 return_PTR(NULL);
 172         }
 173
 174         /*
 175          * Create the element array. Count+1 allows the array to be null
 176          * terminated.
 177          */
 178         package_elements = ACPI_ALLOCATE_ZEROED(((acpi_size) count +
 179                                                  1) * sizeof(void *));
 180         if (!package_elements) {
 181                 acpi_ut_remove_reference(package_desc);
 182                 return_PTR(NULL);
 183         }
 184
 185         package_desc->package.count = count;
 186         package_desc->package.elements = package_elements;
 187         return_PTR(package_desc);
 188 }
 189
 190 /*******************************************************************************
 191  *
 192  * FUNCTION:    acpi_ut_create_buffer_object
 193  *
 194  * PARAMETERS:  buffer_size            - Size of buffer to be created
 195  *
 196  * RETURN:      Pointer to a new Buffer object, null on failure
 197  *
 198  * DESCRIPTION: Create a fully initialized buffer object
 199  *
 200  ******************************************************************************/
 201
 202 union acpi_operand_object *acpi_ut_create_buffer_object(acpi_size buffer_size)
 203 {
 204         union acpi_operand_object *buffer_desc;
 205         u8 *buffer = NULL;
 206
 207         ACPI_FUNCTION_TRACE_U32(ut_create_buffer_object, buffer_size);
 208
 209         /* Create a new Buffer object */
 210
 211         buffer_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
 212         if (!buffer_desc) {
 213                 return_PTR(NULL);
 214         }
 215
 216         /* Create an actual buffer only if size > 0 */
 217
 218         if (buffer_size > 0) {
 219
 220                 /* Allocate the actual buffer */
 221
 222                 buffer = ACPI_ALLOCATE_ZEROED(buffer_size);
 223                 if (!buffer) {
 224                         ACPI_ERROR((AE_INFO, "Could not allocate size %X",
 225                                     (u32) buffer_size));
 226                         acpi_ut_remove_reference(buffer_desc);
 227                         return_PTR(NULL);
 228                 }
 229         }
 230
 231         /* Complete buffer object initialization */
 232
 233         buffer_desc->buffer.flags |= AOPOBJ_DATA_VALID;
 234         buffer_desc->buffer.pointer = buffer;
 235         buffer_desc->buffer.length = (u32) buffer_size;
 236
 237         /* Return the new buffer descriptor */
 238
 239         return_PTR(buffer_desc);
 240 }
 241
 242 /*******************************************************************************
 243  *
 244  * FUNCTION:    acpi_ut_create_string_object
 245  *
 246  * PARAMETERS:  string_size         - Size of string to be created. Does not
 247  *                                    include NULL terminator, this is added
 248  *                                    automatically.
 249  *
 250  * RETURN:      Pointer to a new String object
 251  *
 252  * DESCRIPTION: Create a fully initialized string object
 253  *
 254  ******************************************************************************/
 255
 256 union acpi_operand_object *acpi_ut_create_string_object(acpi_size string_size)
 257 {
 258         union acpi_operand_object *string_desc;
 259         char *string;
 260
 261         ACPI_FUNCTION_TRACE_U32(ut_create_string_object, string_size);
 262
 263         /* Create a new String object */
 264
 265         string_desc = acpi_ut_create_internal_object(ACPI_TYPE_STRING);
 266         if (!string_desc) {
 267                 return_PTR(NULL);
 268         }
 269
 270         /*
 271          * Allocate the actual string buffer -- (Size + 1) for NULL terminator.
 272          * NOTE: Zero-length strings are NULL terminated
 273          */
 274         string = ACPI_ALLOCATE_ZEROED(string_size + 1);
 275         if (!string) {
 276                 ACPI_ERROR((AE_INFO, "Could not allocate size %X",
 277                             (u32) string_size));
 278                 acpi_ut_remove_reference(string_desc);
 279                 return_PTR(NULL);
 280         }
 281
 282         /* Complete string object initialization */
 283
 284         string_desc->string.pointer = string;
 285         string_desc->string.length = (u32) string_size;
 286
 287         /* Return the new string descriptor */
 288
 289         return_PTR(string_desc);
 290 }
 291
 292 /*******************************************************************************
 293  *
 294  * FUNCTION:    acpi_ut_valid_internal_object
 295  *
 296  * PARAMETERS:  Object              - Object to be validated
 297  *
 298  * RETURN:      TRUE if object is valid, FALSE otherwise
 299  *
 300  * DESCRIPTION: Validate a pointer to be a union acpi_operand_object
 301  *
 302  ******************************************************************************/
 303
 304 u8 acpi_ut_valid_internal_object(void *object)
 305 {
 306
 307         ACPI_FUNCTION_NAME(ut_valid_internal_object);
 308
 309         /* Check for a null pointer */
 310
 311         if (!object) {
 312                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "**** Null Object Ptr\n"));
 313                 return (FALSE);
 314         }
 315
 316         /* Check the descriptor type field */
 317
 318         switch (ACPI_GET_DESCRIPTOR_TYPE(object)) {
 319         case ACPI_DESC_TYPE_OPERAND:
 320
 321                 /* The object appears to be a valid union acpi_operand_object    */
 322
 323                 return (TRUE);
 324
 325         default:
 326                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 327                                   "%p is not not an ACPI operand obj [%s]\n",
 328                                   object, acpi_ut_get_descriptor_name(object)));
 329                 break;
 330         }
 331
 332         return (FALSE);
 333 }
 334
 335 /*******************************************************************************
 336  *
 337  * FUNCTION:    acpi_ut_allocate_object_desc_dbg
 338  *
 339  * PARAMETERS:  module_name         - Caller's module name (for error output)
 340  *              line_number         - Caller's line number (for error output)
 341  *              component_id        - Caller's component ID (for error output)
 342  *
 343  * RETURN:      Pointer to newly allocated object descriptor.  Null on error
 344  *
 345  * DESCRIPTION: Allocate a new object descriptor.  Gracefully handle
 346  *              error conditions.
 347  *
 348  ******************************************************************************/
 349
 350 void *acpi_ut_allocate_object_desc_dbg(const char *module_name,
 351                                        u32 line_number, u32 component_id)
 352 {
 353         union acpi_operand_object *object;
 354
 355         ACPI_FUNCTION_TRACE(ut_allocate_object_desc_dbg);
 356
 357         object = acpi_os_acquire_object(acpi_gbl_operand_cache);
 358         if (!object) {
 359                 ACPI_ERROR((module_name, line_number,
 360                             "Could not allocate an object descriptor"));
 361
 362                 return_PTR(NULL);
 363         }
 364
 365         /* Mark the descriptor type */
 366
 367         memset(object, 0, sizeof(union acpi_operand_object));
 368         ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_OPERAND);
 369
 370         ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "%p Size %X\n",
 371                           object, (u32) sizeof(union acpi_operand_object)));
 372
 373         return_PTR(object);
 374 }
 375
 376 /*******************************************************************************
 377  *
 378  * FUNCTION:    acpi_ut_delete_object_desc
 379  *
 380  * PARAMETERS:  Object          - An Acpi internal object to be deleted
 381  *
 382  * RETURN:      None.
 383  *
 384  * DESCRIPTION: Free an ACPI object descriptor or add it to the object cache
 385  *
 386  ******************************************************************************/
 387
 388 void acpi_ut_delete_object_desc(union acpi_operand_object *object)
 389 {
 390         ACPI_FUNCTION_TRACE_PTR(ut_delete_object_desc, object);
 391
 392         /* Object must be a union acpi_operand_object    */
 393
 394         if (ACPI_GET_DESCRIPTOR_TYPE(object) != ACPI_DESC_TYPE_OPERAND) {
 395                 ACPI_ERROR((AE_INFO,
 396                             "%p is not an ACPI Operand object [%s]", object,
 397                             acpi_ut_get_descriptor_name(object)));
 398                 return_VOID;
 399         }
 400
 401         (void)acpi_os_release_object(acpi_gbl_operand_cache, object);
 402         return_VOID;
 403 }
 404
 405 /*******************************************************************************
 406  *
 407  * FUNCTION:    acpi_ut_get_simple_object_size
 408  *
 409  * PARAMETERS:  internal_object    - An ACPI operand object
 410  *              obj_length         - Where the length is returned
 411  *
 412  * RETURN:      Status
 413  *
 414  * DESCRIPTION: This function is called to determine the space required to
 415  *              contain a simple object for return to an external user.
 416  *
 417  *              The length includes the object structure plus any additional
 418  *              needed space.
 419  *
 420  ******************************************************************************/
 421
 422 static acpi_status
 423 acpi_ut_get_simple_object_size(union acpi_operand_object *internal_object,
 424                                acpi_size * obj_length)
 425 {
 426         acpi_size length;
 427         acpi_size size;
 428         acpi_status status = AE_OK;
 429
 430         ACPI_FUNCTION_TRACE_PTR(ut_get_simple_object_size, internal_object);
 431
 432         /*
 433          * Handle a null object (Could be a uninitialized package
 434          * element -- which is legal)
 435          */
 436         if (!internal_object) {
 437                 *obj_length = sizeof(union acpi_object);
 438                 return_ACPI_STATUS(AE_OK);
 439         }
 440
 441         /* Start with the length of the Acpi object */
 442
 443         length = sizeof(union acpi_object);
 444
 445         if (ACPI_GET_DESCRIPTOR_TYPE(internal_object) == ACPI_DESC_TYPE_NAMED) {
 446
 447                 /* Object is a named object (reference), just return the length */
 448
 449                 *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
 450                 return_ACPI_STATUS(status);
 451         }
 452
 453         /*
 454          * The final length depends on the object type
 455          * Strings and Buffers are packed right up against the parent object and
 456          * must be accessed bytewise or there may be alignment problems on
 457          * certain processors
 458          */
 459         switch (ACPI_GET_OBJECT_TYPE(internal_object)) {
 460         case ACPI_TYPE_STRING:
 461
 462                 length += (acpi_size) internal_object->string.length + 1;
 463                 break;
 464
 465         case ACPI_TYPE_BUFFER:
 466
 467                 length += (acpi_size) internal_object->buffer.length;
 468                 break;
 469
 470         case ACPI_TYPE_INTEGER:
 471         case ACPI_TYPE_PROCESSOR:
 472         case ACPI_TYPE_POWER:
 473
 474                 /* No extra data for these types */
 475
 476                 break;
 477
 478         case ACPI_TYPE_LOCAL_REFERENCE:
 479
 480                 switch (internal_object->reference.class) {
 481                 case ACPI_REFCLASS_NAME:
 482
 483                         /*
 484                          * Get the actual length of the full pathname to this object.
 485                          * The reference will be converted to the pathname to the object
 486                          */
 487                         size =
 488                             acpi_ns_get_pathname_length(internal_object->
 489                                                         reference.node);
 490                         if (!size) {
 491                                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 492                         }
 493
 494                         length += ACPI_ROUND_UP_TO_NATIVE_WORD(size);
 495                         break;
 496
 497                 default:
 498
 499                         /*
 500                          * No other reference opcodes are supported.
 501                          * Notably, Locals and Args are not supported, but this may be
 502                          * required eventually.
 503                          */
 504                         ACPI_ERROR((AE_INFO,
 505                                     "Cannot convert to external object - "
 506                                     "unsupported Reference Class [%s] %X in object %p",
 507                                     acpi_ut_get_reference_name(internal_object),
 508                                     internal_object->reference.class,
 509                                     internal_object));
 510                         status = AE_TYPE;
 511                         break;
 512                 }
 513                 break;
 514
 515         default:
 516
 517                 ACPI_ERROR((AE_INFO, "Cannot convert to external object - "
 518                             "unsupported type [%s] %X in object %p",
 519                             acpi_ut_get_object_type_name(internal_object),
 520                             ACPI_GET_OBJECT_TYPE(internal_object),
 521                             internal_object));
 522                 status = AE_TYPE;
 523                 break;
 524         }
 525
 526         /*
 527          * Account for the space required by the object rounded up to the next
 528          * multiple of the machine word size.  This keeps each object aligned
 529          * on a machine word boundary. (preventing alignment faults on some
 530          * machines.)
 531          */
 532         *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
 533         return_ACPI_STATUS(status);
 534 }
 535
 536 /*******************************************************************************
 537  *
 538  * FUNCTION:    acpi_ut_get_element_length
 539  *
 540  * PARAMETERS:  acpi_pkg_callback
 541  *
 542  * RETURN:      Status
 543  *
 544  * DESCRIPTION: Get the length of one package element.
 545  *
 546  ******************************************************************************/
 547
 548 static acpi_status
 549 acpi_ut_get_element_length(u8 object_type,
 550                            union acpi_operand_object *source_object,
 551                            union acpi_generic_state *state, void *context)
 552 {
 553         acpi_status status = AE_OK;
 554         struct acpi_pkg_info *info = (struct acpi_pkg_info *)context;
 555         acpi_size object_space;
 556
 557         switch (object_type) {
 558         case ACPI_COPY_TYPE_SIMPLE:
 559
 560                 /*
 561                  * Simple object - just get the size (Null object/entry is handled
 562                  * here also) and sum it into the running package length
 563                  */
 564                 status =
 565                     acpi_ut_get_simple_object_size(source_object,
 566                                                    &object_space);
 567                 if (ACPI_FAILURE(status)) {
 568                         return (status);
 569                 }
 570
 571                 info->length += object_space;
 572                 break;
 573
 574         case ACPI_COPY_TYPE_PACKAGE:
 575
 576                 /* Package object - nothing much to do here, let the walk handle it */
 577
 578                 info->num_packages++;
 579                 state->pkg.this_target_obj = NULL;
 580                 break;
 581
 582         default:
 583
 584                 /* No other types allowed */
 585
 586                 return (AE_BAD_PARAMETER);
 587         }
 588
 589         return (status);
 590 }
 591
 592 /*******************************************************************************
 593  *
 594  * FUNCTION:    acpi_ut_get_package_object_size
 595  *
 596  * PARAMETERS:  internal_object     - An ACPI internal object
 597  *              obj_length          - Where the length is returned
 598  *
 599  * RETURN:      Status
 600  *
 601  * DESCRIPTION: This function is called to determine the space required to
 602  *              contain a package object for return to an external user.
 603  *
 604  *              This is moderately complex since a package contains other
 605  *              objects including packages.
 606  *
 607  ******************************************************************************/
 608
 609 static acpi_status
 610 acpi_ut_get_package_object_size(union acpi_operand_object *internal_object,
 611                                 acpi_size * obj_length)
 612 {
 613         acpi_status status;
 614         struct acpi_pkg_info info;
 615
 616         ACPI_FUNCTION_TRACE_PTR(ut_get_package_object_size, internal_object);
 617
 618         info.length = 0;
 619         info.object_space = 0;
 620         info.num_packages = 1;
 621
 622         status = acpi_ut_walk_package_tree(internal_object, NULL,
 623                                            acpi_ut_get_element_length, &info);
 624         if (ACPI_FAILURE(status)) {
 625                 return_ACPI_STATUS(status);
 626         }
 627
 628         /*
 629          * We have handled all of the objects in all levels of the package.
 630          * just add the length of the package objects themselves.
 631          * Round up to the next machine word.
 632          */
 633         info.length += ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object)) *
 634             (acpi_size) info.num_packages;
 635
 636         /* Return the total package length */
 637
 638         *obj_length = info.length;
 639         return_ACPI_STATUS(status);
 640 }
 641
 642 /*******************************************************************************
 643  *
 644  * FUNCTION:    acpi_ut_get_object_size
 645  *
 646  * PARAMETERS:  internal_object     - An ACPI internal object
 647  *              obj_length          - Where the length will be returned
 648  *
 649  * RETURN:      Status
 650  *
 651  * DESCRIPTION: This function is called to determine the space required to
 652  *              contain an object for return to an API user.
 653  *
 654  ******************************************************************************/
 655
 656 acpi_status
 657 acpi_ut_get_object_size(union acpi_operand_object *internal_object,
 658                         acpi_size * obj_length)
 659 {
 660         acpi_status status;
 661
 662         ACPI_FUNCTION_ENTRY();
 663
 664         if ((ACPI_GET_DESCRIPTOR_TYPE(internal_object) ==
 665              ACPI_DESC_TYPE_OPERAND)
 666             && (ACPI_GET_OBJECT_TYPE(internal_object) == ACPI_TYPE_PACKAGE)) {
 667                 status =
 668                     acpi_ut_get_package_object_size(internal_object,
 669                                                     obj_length);
 670         } else {
 671                 status =
 672                     acpi_ut_get_simple_object_size(internal_object, obj_length);
 673         }
 674
 675         return (status);
 676 }