drivers/acpi/acpica/rscalc.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rscalc - Calculate stream and list lengths
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, 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 "acresrc.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_RESOURCES
  50 ACPI_MODULE_NAME("rscalc")
  51
  52 /* Local prototypes */
  53 static u8 acpi_rs_count_set_bits(u16 bit_field);
  54
  55 static acpi_rs_length
  56 acpi_rs_struct_option_length(struct acpi_resource_source *resource_source);
  57
  58 static u32
  59 acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length);
  60
  61 /*******************************************************************************
  62  *
  63  * FUNCTION:    acpi_rs_count_set_bits
  64  *
  65  * PARAMETERS:  bit_field       - Field in which to count bits
  66  *
  67  * RETURN:      Number of bits set within the field
  68  *
  69  * DESCRIPTION: Count the number of bits set in a resource field. Used for
  70  *              (Short descriptor) interrupt and DMA lists.
  71  *
  72  ******************************************************************************/
  73
  74 static u8 acpi_rs_count_set_bits(u16 bit_field)
  75 {
  76         u8 bits_set;
  77
  78         ACPI_FUNCTION_ENTRY();
  79
  80         for (bits_set = 0; bit_field; bits_set++) {
  81
  82                 /* Zero the least significant bit that is set */
  83
  84                 bit_field &= (u16) (bit_field - 1);
  85         }
  86
  87         return (bits_set);
  88 }
  89
  90 /*******************************************************************************
  91  *
  92  * FUNCTION:    acpi_rs_struct_option_length
  93  *
  94  * PARAMETERS:  resource_source     - Pointer to optional descriptor field
  95  *
  96  * RETURN:      Status
  97  *
  98  * DESCRIPTION: Common code to handle optional resource_source_index and
  99  *              resource_source fields in some Large descriptors. Used during
 100  *              list-to-stream conversion
 101  *
 102  ******************************************************************************/
 103
 104 static acpi_rs_length
 105 acpi_rs_struct_option_length(struct acpi_resource_source *resource_source)
 106 {
 107         ACPI_FUNCTION_ENTRY();
 108
 109         /*
 110          * If the resource_source string is valid, return the size of the string
 111          * (string_length includes the NULL terminator) plus the size of the
 112          * resource_source_index (1).
 113          */
 114         if (resource_source->string_ptr) {
 115                 return ((acpi_rs_length)(resource_source->string_length + 1));
 116         }
 117
 118         return (0);
 119 }
 120
 121 /*******************************************************************************
 122  *
 123  * FUNCTION:    acpi_rs_stream_option_length
 124  *
 125  * PARAMETERS:  resource_length     - Length from the resource header
 126  *              minimum_total_length - Minimum length of this resource, before
 127  *                                    any optional fields. Includes header size
 128  *
 129  * RETURN:      Length of optional string (0 if no string present)
 130  *
 131  * DESCRIPTION: Common code to handle optional resource_source_index and
 132  *              resource_source fields in some Large descriptors. Used during
 133  *              stream-to-list conversion
 134  *
 135  ******************************************************************************/
 136
 137 static u32
 138 acpi_rs_stream_option_length(u32 resource_length,
 139                              u32 minimum_aml_resource_length)
 140 {
 141         u32 string_length = 0;
 142
 143         ACPI_FUNCTION_ENTRY();
 144
 145         /*
 146          * The resource_source_index and resource_source are optional elements of
 147          * some Large-type resource descriptors.
 148          */
 149
 150         /*
 151          * If the length of the actual resource descriptor is greater than the
 152          * ACPI spec-defined minimum length, it means that a resource_source_index
 153          * exists and is followed by a (required) null terminated string. The
 154          * string length (including the null terminator) is the resource length
 155          * minus the minimum length, minus one byte for the resource_source_index
 156          * itself.
 157          */
 158         if (resource_length > minimum_aml_resource_length) {
 159
 160                 /* Compute the length of the optional string */
 161
 162                 string_length =
 163                     resource_length - minimum_aml_resource_length - 1;
 164         }
 165
 166         /*
 167          * Round the length up to a multiple of the native word in order to
 168          * guarantee that the entire resource descriptor is native word aligned
 169          */
 170         return ((u32) ACPI_ROUND_UP_TO_NATIVE_WORD(string_length));
 171 }
 172
 173 /*******************************************************************************
 174  *
 175  * FUNCTION:    acpi_rs_get_aml_length
 176  *
 177  * PARAMETERS:  resource            - Pointer to the resource linked list
 178  *              resource_list_size  - Size of the resource linked list
 179  *              size_needed         - Where the required size is returned
 180  *
 181  * RETURN:      Status
 182  *
 183  * DESCRIPTION: Takes a linked list of internal resource descriptors and
 184  *              calculates the size buffer needed to hold the corresponding
 185  *              external resource byte stream.
 186  *
 187  ******************************************************************************/
 188
 189 acpi_status
 190 acpi_rs_get_aml_length(struct acpi_resource *resource,
 191                        acpi_size resource_list_size, acpi_size *size_needed)
 192 {
 193         acpi_size aml_size_needed = 0;
 194         struct acpi_resource *resource_end;
 195         acpi_rs_length total_size;
 196
 197         ACPI_FUNCTION_TRACE(rs_get_aml_length);
 198
 199         /* Traverse entire list of internal resource descriptors */
 200
 201         resource_end =
 202             ACPI_ADD_PTR(struct acpi_resource, resource, resource_list_size);
 203         while (resource < resource_end) {
 204
 205                 /* Validate the descriptor type */
 206
 207                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
 208                         return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
 209                 }
 210
 211                 /* Sanity check the length. It must not be zero, or we loop forever */
 212
 213                 if (!resource->length) {
 214                         return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
 215                 }
 216
 217                 /* Get the base size of the (external stream) resource descriptor */
 218
 219                 total_size = acpi_gbl_aml_resource_sizes[resource->type];
 220
 221                 /*
 222                  * Augment the base size for descriptors with optional and/or
 223                  * variable-length fields
 224                  */
 225                 switch (resource->type) {
 226                 case ACPI_RESOURCE_TYPE_IRQ:
 227
 228                         /* Length can be 3 or 2 */
 229
 230                         if (resource->data.irq.descriptor_length == 2) {
 231                                 total_size--;
 232                         }
 233                         break;
 234
 235                 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
 236
 237                         /* Length can be 1 or 0 */
 238
 239                         if (resource->data.irq.descriptor_length == 0) {
 240                                 total_size--;
 241                         }
 242                         break;
 243
 244                 case ACPI_RESOURCE_TYPE_VENDOR:
 245                         /*
 246                          * Vendor Defined Resource:
 247                          * For a Vendor Specific resource, if the Length is between 1 and 7
 248                          * it will be created as a Small Resource data type, otherwise it
 249                          * is a Large Resource data type.
 250                          */
 251                         if (resource->data.vendor.byte_length > 7) {
 252
 253                                 /* Base size of a Large resource descriptor */
 254
 255                                 total_size =
 256                                     sizeof(struct aml_resource_large_header);
 257                         }
 258
 259                         /* Add the size of the vendor-specific data */
 260
 261                         total_size = (acpi_rs_length)
 262                             (total_size + resource->data.vendor.byte_length);
 263                         break;
 264
 265                 case ACPI_RESOURCE_TYPE_END_TAG:
 266                         /*
 267                          * End Tag:
 268                          * We are done -- return the accumulated total size.
 269                          */
 270                         *size_needed = aml_size_needed + total_size;
 271
 272                         /* Normal exit */
 273
 274                         return_ACPI_STATUS(AE_OK);
 275
 276                 case ACPI_RESOURCE_TYPE_ADDRESS16:
 277                         /*
 278                          * 16-Bit Address Resource:
 279                          * Add the size of the optional resource_source info
 280                          */
 281                         total_size = (acpi_rs_length)(total_size +
 282                                                       acpi_rs_struct_option_length
 283                                                       (&resource->data.
 284                                                        address16.
 285                                                        resource_source));
 286                         break;
 287
 288                 case ACPI_RESOURCE_TYPE_ADDRESS32:
 289                         /*
 290                          * 32-Bit Address Resource:
 291                          * Add the size of the optional resource_source info
 292                          */
 293                         total_size = (acpi_rs_length)(total_size +
 294                                                       acpi_rs_struct_option_length
 295                                                       (&resource->data.
 296                                                        address32.
 297                                                        resource_source));
 298                         break;
 299
 300                 case ACPI_RESOURCE_TYPE_ADDRESS64:
 301                         /*
 302                          * 64-Bit Address Resource:
 303                          * Add the size of the optional resource_source info
 304                          */
 305                         total_size = (acpi_rs_length)(total_size +
 306                                                       acpi_rs_struct_option_length
 307                                                       (&resource->data.
 308                                                        address64.
 309                                                        resource_source));
 310                         break;
 311
 312                 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 313                         /*
 314                          * Extended IRQ Resource:
 315                          * Add the size of each additional optional interrupt beyond the
 316                          * required 1 (4 bytes for each u32 interrupt number)
 317                          */
 318                         total_size = (acpi_rs_length)(total_size +
 319                                                       ((resource->data.
 320                                                         extended_irq.
 321                                                         interrupt_count -
 322                                                         1) * 4) +
 323                                                       /* Add the size of the optional resource_source info */
 324                                                       acpi_rs_struct_option_length
 325                                                       (&resource->data.
 326                                                        extended_irq.
 327                                                        resource_source));
 328                         break;
 329
 330                 case ACPI_RESOURCE_TYPE_GPIO:
 331
 332                         total_size = (acpi_rs_length)(total_size +
 333                                                       (resource->data.gpio.
 334                                                        pin_table_length * 2) +
 335                                                       resource->data.gpio.
 336                                                       resource_source.
 337                                                       string_length +
 338                                                       resource->data.gpio.
 339                                                       vendor_length);
 340
 341                         break;
 342
 343                 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
 344
 345                         total_size =
 346                             acpi_gbl_aml_resource_serial_bus_sizes[resource->
 347                                                                    data.
 348                                                                    common_serial_bus.
 349                                                                    type];
 350
 351                         total_size = (acpi_rs_length)(total_size +
 352                                                       resource->data.
 353                                                       i2c_serial_bus.
 354                                                       resource_source.
 355                                                       string_length +
 356                                                       resource->data.
 357                                                       i2c_serial_bus.
 358                                                       vendor_length);
 359
 360                         break;
 361
 362                 default:
 363
 364                         break;
 365                 }
 366
 367                 /* Update the total */
 368
 369                 aml_size_needed += total_size;
 370
 371                 /* Point to the next object */
 372
 373                 resource =
 374                     ACPI_ADD_PTR(struct acpi_resource, resource,
 375                                  resource->length);
 376         }
 377
 378         /* Did not find an end_tag resource descriptor */
 379
 380         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 381 }
 382
 383 /*******************************************************************************
 384  *
 385  * FUNCTION:    acpi_rs_get_list_length
 386  *
 387  * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
 388  *              aml_buffer_length   - Size of aml_buffer
 389  *              size_needed         - Where the size needed is returned
 390  *
 391  * RETURN:      Status
 392  *
 393  * DESCRIPTION: Takes an external resource byte stream and calculates the size
 394  *              buffer needed to hold the corresponding internal resource
 395  *              descriptor linked list.
 396  *
 397  ******************************************************************************/
 398
 399 acpi_status
 400 acpi_rs_get_list_length(u8 *aml_buffer,
 401                         u32 aml_buffer_length, acpi_size *size_needed)
 402 {
 403         acpi_status status;
 404         u8 *end_aml;
 405         u8 *buffer;
 406         u32 buffer_size;
 407         u16 temp16;
 408         u16 resource_length;
 409         u32 extra_struct_bytes;
 410         u8 resource_index;
 411         u8 minimum_aml_resource_length;
 412         union aml_resource *aml_resource;
 413
 414         ACPI_FUNCTION_TRACE(rs_get_list_length);
 415
 416         *size_needed = ACPI_RS_SIZE_MIN;        /* Minimum size is one end_tag */
 417         end_aml = aml_buffer + aml_buffer_length;
 418
 419         /* Walk the list of AML resource descriptors */
 420
 421         while (aml_buffer < end_aml) {
 422
 423                 /* Validate the Resource Type and Resource Length */
 424
 425                 status =
 426                     acpi_ut_validate_resource(NULL, aml_buffer,
 427                                               &resource_index);
 428                 if (ACPI_FAILURE(status)) {
 429                         /*
 430                          * Exit on failure. Cannot continue because the descriptor length
 431                          * may be bogus also.
 432                          */
 433                         return_ACPI_STATUS(status);
 434                 }
 435
 436                 aml_resource = (void *)aml_buffer;
 437
 438                 /* Get the resource length and base (minimum) AML size */
 439
 440                 resource_length = acpi_ut_get_resource_length(aml_buffer);
 441                 minimum_aml_resource_length =
 442                     acpi_gbl_resource_aml_sizes[resource_index];
 443
 444                 /*
 445                  * Augment the size for descriptors with optional
 446                  * and/or variable length fields
 447                  */
 448                 extra_struct_bytes = 0;
 449                 buffer =
 450                     aml_buffer + acpi_ut_get_resource_header_length(aml_buffer);
 451
 452                 switch (acpi_ut_get_resource_type(aml_buffer)) {
 453                 case ACPI_RESOURCE_NAME_IRQ:
 454                         /*
 455                          * IRQ Resource:
 456                          * Get the number of bits set in the 16-bit IRQ mask
 457                          */
 458                         ACPI_MOVE_16_TO_16(&temp16, buffer);
 459                         extra_struct_bytes = acpi_rs_count_set_bits(temp16);
 460                         break;
 461
 462                 case ACPI_RESOURCE_NAME_DMA:
 463                         /*
 464                          * DMA Resource:
 465                          * Get the number of bits set in the 8-bit DMA mask
 466                          */
 467                         extra_struct_bytes = acpi_rs_count_set_bits(*buffer);
 468                         break;
 469
 470                 case ACPI_RESOURCE_NAME_VENDOR_SMALL:
 471                 case ACPI_RESOURCE_NAME_VENDOR_LARGE:
 472                         /*
 473                          * Vendor Resource:
 474                          * Get the number of vendor data bytes
 475                          */
 476                         extra_struct_bytes = resource_length;
 477
 478                         /*
 479                          * There is already one byte included in the minimum
 480                          * descriptor size. If there are extra struct bytes,
 481                          * subtract one from the count.
 482                          */
 483                         if (extra_struct_bytes) {
 484                                 extra_struct_bytes--;
 485                         }
 486                         break;
 487
 488                 case ACPI_RESOURCE_NAME_END_TAG:
 489                         /*
 490                          * End Tag: This is the normal exit
 491                          */
 492                         return_ACPI_STATUS(AE_OK);
 493
 494                 case ACPI_RESOURCE_NAME_ADDRESS32:
 495                 case ACPI_RESOURCE_NAME_ADDRESS16:
 496                 case ACPI_RESOURCE_NAME_ADDRESS64:
 497                         /*
 498                          * Address Resource:
 499                          * Add the size of the optional resource_source
 500                          */
 501                         extra_struct_bytes =
 502                             acpi_rs_stream_option_length(resource_length,
 503                                                          minimum_aml_resource_length);
 504                         break;
 505
 506                 case ACPI_RESOURCE_NAME_EXTENDED_IRQ:
 507                         /*
 508                          * Extended IRQ Resource:
 509                          * Using the interrupt_table_length, add 4 bytes for each additional
 510                          * interrupt. Note: at least one interrupt is required and is
 511                          * included in the minimum descriptor size (reason for the -1)
 512                          */
 513                         extra_struct_bytes = (buffer[1] - 1) * sizeof(u32);
 514
 515                         /* Add the size of the optional resource_source */
 516
 517                         extra_struct_bytes +=
 518                             acpi_rs_stream_option_length(resource_length -
 519                                                          extra_struct_bytes,
 520                                                          minimum_aml_resource_length);
 521                         break;
 522
 523                 case ACPI_RESOURCE_NAME_GPIO:
 524
 525                         /* Vendor data is optional */
 526
 527                         if (aml_resource->gpio.vendor_length) {
 528                                 extra_struct_bytes +=
 529                                     aml_resource->gpio.vendor_offset -
 530                                     aml_resource->gpio.pin_table_offset +
 531                                     aml_resource->gpio.vendor_length;
 532                         } else {
 533                                 extra_struct_bytes +=
 534                                     aml_resource->large_header.resource_length +
 535                                     sizeof(struct aml_resource_large_header) -
 536                                     aml_resource->gpio.pin_table_offset;
 537                         }
 538                         break;
 539
 540                 case ACPI_RESOURCE_NAME_SERIAL_BUS:
 541
 542                         minimum_aml_resource_length =
 543                             acpi_gbl_resource_aml_serial_bus_sizes
 544                             [aml_resource->common_serial_bus.type];
 545                         extra_struct_bytes +=
 546                             aml_resource->common_serial_bus.resource_length -
 547                             minimum_aml_resource_length;
 548                         break;
 549
 550                 default:
 551
 552                         break;
 553                 }
 554
 555                 /*
 556                  * Update the required buffer size for the internal descriptor structs
 557                  *
 558                  * Important: Round the size up for the appropriate alignment. This
 559                  * is a requirement on IA64.
 560                  */
 561                 if (acpi_ut_get_resource_type(aml_buffer) ==
 562                     ACPI_RESOURCE_NAME_SERIAL_BUS) {
 563                         buffer_size =
 564                             acpi_gbl_resource_struct_serial_bus_sizes
 565                             [aml_resource->common_serial_bus.type] +
 566                             extra_struct_bytes;
 567                 } else {
 568                         buffer_size =
 569                             acpi_gbl_resource_struct_sizes[resource_index] +
 570                             extra_struct_bytes;
 571                 }
 572
 573                 buffer_size = (u32)ACPI_ROUND_UP_TO_NATIVE_WORD(buffer_size);
 574                 *size_needed += buffer_size;
 575
 576                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 577                                   "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
 578                                   acpi_ut_get_resource_type(aml_buffer),
 579                                   acpi_ut_get_descriptor_length(aml_buffer),
 580                                   buffer_size));
 581
 582                 /*
 583                  * Point to the next resource within the AML stream using the length
 584                  * contained in the resource descriptor header
 585                  */
 586                 aml_buffer += acpi_ut_get_descriptor_length(aml_buffer);
 587         }
 588
 589         /* Did not find an end_tag resource descriptor */
 590
 591         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 592 }
 593
 594 /*******************************************************************************
 595  *
 596  * FUNCTION:    acpi_rs_get_pci_routing_table_length
 597  *
 598  * PARAMETERS:  package_object          - Pointer to the package object
 599  *              buffer_size_needed      - u32 pointer of the size buffer
 600  *                                        needed to properly return the
 601  *                                        parsed data
 602  *
 603  * RETURN:      Status
 604  *
 605  * DESCRIPTION: Given a package representing a PCI routing table, this
 606  *              calculates the size of the corresponding linked list of
 607  *              descriptions.
 608  *
 609  ******************************************************************************/
 610
 611 acpi_status
 612 acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
 613                                      acpi_size *buffer_size_needed)
 614 {
 615         u32 number_of_elements;
 616         acpi_size temp_size_needed = 0;
 617         union acpi_operand_object **top_object_list;
 618         u32 index;
 619         union acpi_operand_object *package_element;
 620         union acpi_operand_object **sub_object_list;
 621         u8 name_found;
 622         u32 table_index;
 623
 624         ACPI_FUNCTION_TRACE(rs_get_pci_routing_table_length);
 625
 626         number_of_elements = package_object->package.count;
 627
 628         /*
 629          * Calculate the size of the return buffer.
 630          * The base size is the number of elements * the sizes of the
 631          * structures. Additional space for the strings is added below.
 632          * The minus one is to subtract the size of the u8 Source[1]
 633          * member because it is added below.
 634          *
 635          * But each PRT_ENTRY structure has a pointer to a string and
 636          * the size of that string must be found.
 637          */
 638         top_object_list = package_object->package.elements;
 639
 640         for (index = 0; index < number_of_elements; index++) {
 641
 642                 /* Dereference the subpackage */
 643
 644                 package_element = *top_object_list;
 645
 646                 /* We must have a valid Package object */
 647
 648                 if (!package_element ||
 649                     (package_element->common.type != ACPI_TYPE_PACKAGE)) {
 650                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 651                 }
 652
 653                 /*
 654                  * The sub_object_list will now point to an array of the
 655                  * four IRQ elements: Address, Pin, Source and source_index
 656                  */
 657                 sub_object_list = package_element->package.elements;
 658
 659                 /* Scan the irq_table_elements for the Source Name String */
 660
 661                 name_found = FALSE;
 662
 663                 for (table_index = 0;
 664                      table_index < package_element->package.count
 665                      && !name_found; table_index++) {
 666                         if (*sub_object_list && /* Null object allowed */
 667                             ((ACPI_TYPE_STRING ==
 668                               (*sub_object_list)->common.type) ||
 669                              ((ACPI_TYPE_LOCAL_REFERENCE ==
 670                                (*sub_object_list)->common.type) &&
 671                               ((*sub_object_list)->reference.class ==
 672                                ACPI_REFCLASS_NAME)))) {
 673                                 name_found = TRUE;
 674                         } else {
 675                                 /* Look at the next element */
 676
 677                                 sub_object_list++;
 678                         }
 679                 }
 680
 681                 temp_size_needed += (sizeof(struct acpi_pci_routing_table) - 4);
 682
 683                 /* Was a String type found? */
 684
 685                 if (name_found) {
 686                         if ((*sub_object_list)->common.type == ACPI_TYPE_STRING) {
 687                                 /*
 688                                  * The length String.Length field does not include the
 689                                  * terminating NULL, add 1
 690                                  */
 691                                 temp_size_needed += ((acpi_size)
 692                                                      (*sub_object_list)->string.
 693                                                      length + 1);
 694                         } else {
 695                                 temp_size_needed += acpi_ns_get_pathname_length((*sub_object_list)->reference.node);
 696                         }
 697                 } else {
 698                         /*
 699                          * If no name was found, then this is a NULL, which is
 700                          * translated as a u32 zero.
 701                          */
 702                         temp_size_needed += sizeof(u32);
 703                 }
 704
 705                 /* Round up the size since each element must be aligned */
 706
 707                 temp_size_needed = ACPI_ROUND_UP_TO_64BIT(temp_size_needed);
 708
 709                 /* Point to the next union acpi_operand_object */
 710
 711                 top_object_list++;
 712         }
 713
 714         /*
 715          * Add an extra element to the end of the list, essentially a
 716          * NULL terminator
 717          */
 718         *buffer_size_needed =
 719             temp_size_needed + sizeof(struct acpi_pci_routing_table);
 720         return_ACPI_STATUS(AE_OK);
 721 }