drivers/acpi/acpica/rscalc.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rscalc - Calculate stream and list lengths
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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 some
 147          * Large-type resource descriptors.
 148          */
 149
 150         /*
 151          * If the length of the actual resource descriptor is greater than the ACPI
 152          * spec-defined minimum length, it means that a resource_source_index exists
 153          * and is followed by a (required) null terminated string. The string length
 154          * (including the null terminator) is the resource length minus the minimum
 155          * length, minus one byte for the resource_source_index itself.
 156          */
 157         if (resource_length > minimum_aml_resource_length) {
 158
 159                 /* Compute the length of the optional string */
 160
 161                 string_length =
 162                     resource_length - minimum_aml_resource_length - 1;
 163         }
 164
 165         /*
 166          * Round the length up to a multiple of the native word in order to
 167          * guarantee that the entire resource descriptor is native word aligned
 168          */
 169         return ((u32) ACPI_ROUND_UP_TO_NATIVE_WORD(string_length));
 170 }
 171
 172 /*******************************************************************************
 173  *
 174  * FUNCTION:    acpi_rs_get_aml_length
 175  *
 176  * PARAMETERS:  resource            - Pointer to the resource linked list
 177  *              resource_list_size  - Size of the resource linked list
 178  *              size_needed         - Where the required size is returned
 179  *
 180  * RETURN:      Status
 181  *
 182  * DESCRIPTION: Takes a linked list of internal resource descriptors and
 183  *              calculates the size buffer needed to hold the corresponding
 184  *              external resource byte stream.
 185  *
 186  ******************************************************************************/
 187
 188 acpi_status
 189 acpi_rs_get_aml_length(struct acpi_resource *resource,
 190                        acpi_size resource_list_size, acpi_size * size_needed)
 191 {
 192         acpi_size aml_size_needed = 0;
 193         struct acpi_resource *resource_end;
 194         acpi_rs_length total_size;
 195
 196         ACPI_FUNCTION_TRACE(rs_get_aml_length);
 197
 198         /* Traverse entire list of internal resource descriptors */
 199
 200         resource_end =
 201             ACPI_ADD_PTR(struct acpi_resource, resource, resource_list_size);
 202         while (resource < resource_end) {
 203
 204                 /* Validate the descriptor type */
 205
 206                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
 207                         return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
 208                 }
 209
 210                 /* Sanity check the length. It must not be zero, or we loop forever */
 211
 212                 if (!resource->length) {
 213                         return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
 214                 }
 215
 216                 /* Get the base size of the (external stream) resource descriptor */
 217
 218                 total_size = acpi_gbl_aml_resource_sizes[resource->type];
 219
 220                 /*
 221                  * Augment the base size for descriptors with optional and/or
 222                  * variable-length fields
 223                  */
 224                 switch (resource->type) {
 225                 case ACPI_RESOURCE_TYPE_IRQ:
 226
 227                         /* Length can be 3 or 2 */
 228
 229                         if (resource->data.irq.descriptor_length == 2) {
 230                                 total_size--;
 231                         }
 232                         break;
 233
 234                 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
 235
 236                         /* Length can be 1 or 0 */
 237
 238                         if (resource->data.irq.descriptor_length == 0) {
 239                                 total_size--;
 240                         }
 241                         break;
 242
 243                 case ACPI_RESOURCE_TYPE_VENDOR:
 244                         /*
 245                          * Vendor Defined Resource:
 246                          * For a Vendor Specific resource, if the Length is between 1 and 7
 247                          * it will be created as a Small Resource data type, otherwise it
 248                          * is a Large Resource data type.
 249                          */
 250                         if (resource->data.vendor.byte_length > 7) {
 251
 252                                 /* Base size of a Large resource descriptor */
 253
 254                                 total_size =
 255                                     sizeof(struct aml_resource_large_header);
 256                         }
 257
 258                         /* Add the size of the vendor-specific data */
 259
 260                         total_size = (acpi_rs_length)
 261                             (total_size + resource->data.vendor.byte_length);
 262                         break;
 263
 264                 case ACPI_RESOURCE_TYPE_END_TAG:
 265                         /*
 266                          * End Tag:
 267                          * We are done -- return the accumulated total size.
 268                          */
 269                         *size_needed = aml_size_needed + total_size;
 270
 271                         /* Normal exit */
 272
 273                         return_ACPI_STATUS(AE_OK);
 274
 275                 case ACPI_RESOURCE_TYPE_ADDRESS16:
 276                         /*
 277                          * 16-Bit Address Resource:
 278                          * Add the size of the optional resource_source info
 279                          */
 280                         total_size = (acpi_rs_length)
 281                             (total_size +
 282                              acpi_rs_struct_option_length(&resource->data.
 283                                                           address16.
 284                                                           resource_source));
 285                         break;
 286
 287                 case ACPI_RESOURCE_TYPE_ADDRESS32:
 288                         /*
 289                          * 32-Bit Address Resource:
 290                          * Add the size of the optional resource_source info
 291                          */
 292                         total_size = (acpi_rs_length)
 293                             (total_size +
 294                              acpi_rs_struct_option_length(&resource->data.
 295                                                           address32.
 296                                                           resource_source));
 297                         break;
 298
 299                 case ACPI_RESOURCE_TYPE_ADDRESS64:
 300                         /*
 301                          * 64-Bit Address Resource:
 302                          * Add the size of the optional resource_source info
 303                          */
 304                         total_size = (acpi_rs_length)
 305                             (total_size +
 306                              acpi_rs_struct_option_length(&resource->data.
 307                                                           address64.
 308                                                           resource_source));
 309                         break;
 310
 311                 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 312                         /*
 313                          * Extended IRQ Resource:
 314                          * Add the size of each additional optional interrupt beyond the
 315                          * required 1 (4 bytes for each u32 interrupt number)
 316                          */
 317                         total_size = (acpi_rs_length)
 318                             (total_size +
 319                              ((resource->data.extended_irq.interrupt_count -
 320                                1) * 4) +
 321                              /* Add the size of the optional resource_source info */
 322                              acpi_rs_struct_option_length(&resource->data.
 323                                                           extended_irq.
 324                                                           resource_source));
 325                         break;
 326
 327                 case ACPI_RESOURCE_TYPE_GPIO:
 328
 329                         total_size =
 330                             (acpi_rs_length) (total_size +
 331                                               (resource->data.gpio.
 332                                                pin_table_length * 2) +
 333                                               resource->data.gpio.
 334                                               resource_source.string_length +
 335                                               resource->data.gpio.
 336                                               vendor_length);
 337
 338                         break;
 339
 340                 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
 341
 342                         total_size =
 343                             acpi_gbl_aml_resource_serial_bus_sizes[resource->
 344                                                                    data.
 345                                                                    common_serial_bus.
 346                                                                    type];
 347
 348                         total_size = (acpi_rs_length) (total_size +
 349                                                        resource->data.
 350                                                        i2c_serial_bus.
 351                                                        resource_source.
 352                                                        string_length +
 353                                                        resource->data.
 354                                                        i2c_serial_bus.
 355                                                        vendor_length);
 356
 357                         break;
 358
 359                 default:
 360
 361                         break;
 362                 }
 363
 364                 /* Update the total */
 365
 366                 aml_size_needed += total_size;
 367
 368                 /* Point to the next object */
 369
 370                 resource =
 371                     ACPI_ADD_PTR(struct acpi_resource, resource,
 372                                  resource->length);
 373         }
 374
 375         /* Did not find an end_tag resource descriptor */
 376
 377         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 378 }
 379
 380 /*******************************************************************************
 381  *
 382  * FUNCTION:    acpi_rs_get_list_length
 383  *
 384  * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
 385  *              aml_buffer_length   - Size of aml_buffer
 386  *              size_needed         - Where the size needed is returned
 387  *
 388  * RETURN:      Status
 389  *
 390  * DESCRIPTION: Takes an external resource byte stream and calculates the size
 391  *              buffer needed to hold the corresponding internal resource
 392  *              descriptor linked list.
 393  *
 394  ******************************************************************************/
 395
 396 acpi_status
 397 acpi_rs_get_list_length(u8 * aml_buffer,
 398                         u32 aml_buffer_length, acpi_size * size_needed)
 399 {
 400         acpi_status status;
 401         u8 *end_aml;
 402         u8 *buffer;
 403         u32 buffer_size;
 404         u16 temp16;
 405         u16 resource_length;
 406         u32 extra_struct_bytes;
 407         u8 resource_index;
 408         u8 minimum_aml_resource_length;
 409         union aml_resource *aml_resource;
 410
 411         ACPI_FUNCTION_TRACE(rs_get_list_length);
 412
 413         *size_needed = ACPI_RS_SIZE_MIN;        /* Minimum size is one end_tag */
 414         end_aml = aml_buffer + aml_buffer_length;
 415
 416         /* Walk the list of AML resource descriptors */
 417
 418         while (aml_buffer < end_aml) {
 419
 420                 /* Validate the Resource Type and Resource Length */
 421
 422                 status =
 423                     acpi_ut_validate_resource(NULL, aml_buffer,
 424                                               &resource_index);
 425                 if (ACPI_FAILURE(status)) {
 426                         /*
 427                          * Exit on failure. Cannot continue because the descriptor length
 428                          * may be bogus also.
 429                          */
 430                         return_ACPI_STATUS(status);
 431                 }
 432
 433                 aml_resource = (void *)aml_buffer;
 434
 435                 /* Get the resource length and base (minimum) AML size */
 436
 437                 resource_length = acpi_ut_get_resource_length(aml_buffer);
 438                 minimum_aml_resource_length =
 439                     acpi_gbl_resource_aml_sizes[resource_index];
 440
 441                 /*
 442                  * Augment the size for descriptors with optional
 443                  * and/or variable length fields
 444                  */
 445                 extra_struct_bytes = 0;
 446                 buffer =
 447                     aml_buffer + acpi_ut_get_resource_header_length(aml_buffer);
 448
 449                 switch (acpi_ut_get_resource_type(aml_buffer)) {
 450                 case ACPI_RESOURCE_NAME_IRQ:
 451                         /*
 452                          * IRQ Resource:
 453                          * Get the number of bits set in the 16-bit IRQ mask
 454                          */
 455                         ACPI_MOVE_16_TO_16(&temp16, buffer);
 456                         extra_struct_bytes = acpi_rs_count_set_bits(temp16);
 457                         break;
 458
 459                 case ACPI_RESOURCE_NAME_DMA:
 460                         /*
 461                          * DMA Resource:
 462                          * Get the number of bits set in the 8-bit DMA mask
 463                          */
 464                         extra_struct_bytes = acpi_rs_count_set_bits(*buffer);
 465                         break;
 466
 467                 case ACPI_RESOURCE_NAME_VENDOR_SMALL:
 468                 case ACPI_RESOURCE_NAME_VENDOR_LARGE:
 469                         /*
 470                          * Vendor Resource:
 471                          * Get the number of vendor data bytes
 472                          */
 473                         extra_struct_bytes = resource_length;
 474
 475                         /*
 476                          * There is already one byte included in the minimum
 477                          * descriptor size. If there are extra struct bytes,
 478                          * subtract one from the count.
 479                          */
 480                         if (extra_struct_bytes) {
 481                                 extra_struct_bytes--;
 482                         }
 483                         break;
 484
 485                 case ACPI_RESOURCE_NAME_END_TAG:
 486                         /*
 487                          * End Tag: This is the normal exit
 488                          */
 489                         return_ACPI_STATUS(AE_OK);
 490
 491                 case ACPI_RESOURCE_NAME_ADDRESS32:
 492                 case ACPI_RESOURCE_NAME_ADDRESS16:
 493                 case ACPI_RESOURCE_NAME_ADDRESS64:
 494                         /*
 495                          * Address Resource:
 496                          * Add the size of the optional resource_source
 497                          */
 498                         extra_struct_bytes =
 499                             acpi_rs_stream_option_length(resource_length,
 500                                                          minimum_aml_resource_length);
 501                         break;
 502
 503                 case ACPI_RESOURCE_NAME_EXTENDED_IRQ:
 504                         /*
 505                          * Extended IRQ Resource:
 506                          * Using the interrupt_table_length, add 4 bytes for each additional
 507                          * interrupt. Note: at least one interrupt is required and is
 508                          * included in the minimum descriptor size (reason for the -1)
 509                          */
 510                         extra_struct_bytes = (buffer[1] - 1) * sizeof(u32);
 511
 512                         /* Add the size of the optional resource_source */
 513
 514                         extra_struct_bytes +=
 515                             acpi_rs_stream_option_length(resource_length -
 516                                                          extra_struct_bytes,
 517                                                          minimum_aml_resource_length);
 518                         break;
 519
 520                 case ACPI_RESOURCE_NAME_GPIO:
 521
 522                         /* Vendor data is optional */
 523
 524                         if (aml_resource->gpio.vendor_length) {
 525                                 extra_struct_bytes +=
 526                                     aml_resource->gpio.vendor_offset -
 527                                     aml_resource->gpio.pin_table_offset +
 528                                     aml_resource->gpio.vendor_length;
 529                         } else {
 530                                 extra_struct_bytes +=
 531                                     aml_resource->large_header.resource_length +
 532                                     sizeof(struct aml_resource_large_header) -
 533                                     aml_resource->gpio.pin_table_offset;
 534                         }
 535                         break;
 536
 537                 case ACPI_RESOURCE_NAME_SERIAL_BUS:
 538
 539                         minimum_aml_resource_length =
 540                             acpi_gbl_resource_aml_serial_bus_sizes
 541                             [aml_resource->common_serial_bus.type];
 542                         extra_struct_bytes +=
 543                             aml_resource->common_serial_bus.resource_length -
 544                             minimum_aml_resource_length;
 545                         break;
 546
 547                 default:
 548
 549                         break;
 550                 }
 551
 552                 /*
 553                  * Update the required buffer size for the internal descriptor structs
 554                  *
 555                  * Important: Round the size up for the appropriate alignment. This
 556                  * is a requirement on IA64.
 557                  */
 558                 if (acpi_ut_get_resource_type(aml_buffer) ==
 559                     ACPI_RESOURCE_NAME_SERIAL_BUS) {
 560                         buffer_size =
 561                             acpi_gbl_resource_struct_serial_bus_sizes
 562                             [aml_resource->common_serial_bus.type] +
 563                             extra_struct_bytes;
 564                 } else {
 565                         buffer_size =
 566                             acpi_gbl_resource_struct_sizes[resource_index] +
 567                             extra_struct_bytes;
 568                 }
 569                 buffer_size = (u32)ACPI_ROUND_UP_TO_NATIVE_WORD(buffer_size);
 570
 571                 *size_needed += buffer_size;
 572
 573                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 574                                   "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
 575                                   acpi_ut_get_resource_type(aml_buffer),
 576                                   acpi_ut_get_descriptor_length(aml_buffer),
 577                                   buffer_size));
 578
 579                 /*
 580                  * Point to the next resource within the AML stream using the length
 581                  * contained in the resource descriptor header
 582                  */
 583                 aml_buffer += acpi_ut_get_descriptor_length(aml_buffer);
 584         }
 585
 586         /* Did not find an end_tag resource descriptor */
 587
 588         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 589 }
 590
 591 /*******************************************************************************
 592  *
 593  * FUNCTION:    acpi_rs_get_pci_routing_table_length
 594  *
 595  * PARAMETERS:  package_object          - Pointer to the package object
 596  *              buffer_size_needed      - u32 pointer of the size buffer
 597  *                                        needed to properly return the
 598  *                                        parsed data
 599  *
 600  * RETURN:      Status
 601  *
 602  * DESCRIPTION: Given a package representing a PCI routing table, this
 603  *              calculates the size of the corresponding linked list of
 604  *              descriptions.
 605  *
 606  ******************************************************************************/
 607
 608 acpi_status
 609 acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
 610                                      acpi_size * buffer_size_needed)
 611 {
 612         u32 number_of_elements;
 613         acpi_size temp_size_needed = 0;
 614         union acpi_operand_object **top_object_list;
 615         u32 index;
 616         union acpi_operand_object *package_element;
 617         union acpi_operand_object **sub_object_list;
 618         u8 name_found;
 619         u32 table_index;
 620
 621         ACPI_FUNCTION_TRACE(rs_get_pci_routing_table_length);
 622
 623         number_of_elements = package_object->package.count;
 624
 625         /*
 626          * Calculate the size of the return buffer.
 627          * The base size is the number of elements * the sizes of the
 628          * structures. Additional space for the strings is added below.
 629          * The minus one is to subtract the size of the u8 Source[1]
 630          * member because it is added below.
 631          *
 632          * But each PRT_ENTRY structure has a pointer to a string and
 633          * the size of that string must be found.
 634          */
 635         top_object_list = package_object->package.elements;
 636
 637         for (index = 0; index < number_of_elements; index++) {
 638
 639                 /* Dereference the sub-package */
 640
 641                 package_element = *top_object_list;
 642
 643                 /* We must have a valid Package object */
 644
 645                 if (!package_element ||
 646                     (package_element->common.type != ACPI_TYPE_PACKAGE)) {
 647                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 648                 }
 649
 650                 /*
 651                  * The sub_object_list will now point to an array of the
 652                  * four IRQ elements: Address, Pin, Source and source_index
 653                  */
 654                 sub_object_list = package_element->package.elements;
 655
 656                 /* Scan the irq_table_elements for the Source Name String */
 657
 658                 name_found = FALSE;
 659
 660                 for (table_index = 0;
 661                      table_index < package_element->package.count
 662                      && !name_found; table_index++) {
 663                         if (*sub_object_list && /* Null object allowed */
 664                             ((ACPI_TYPE_STRING ==
 665                               (*sub_object_list)->common.type) ||
 666                              ((ACPI_TYPE_LOCAL_REFERENCE ==
 667                                (*sub_object_list)->common.type) &&
 668                               ((*sub_object_list)->reference.class ==
 669                                ACPI_REFCLASS_NAME)))) {
 670                                 name_found = TRUE;
 671                         } else {
 672                                 /* Look at the next element */
 673
 674                                 sub_object_list++;
 675                         }
 676                 }
 677
 678                 temp_size_needed += (sizeof(struct acpi_pci_routing_table) - 4);
 679
 680                 /* Was a String type found? */
 681
 682                 if (name_found) {
 683                         if ((*sub_object_list)->common.type == ACPI_TYPE_STRING) {
 684                                 /*
 685                                  * The length String.Length field does not include the
 686                                  * terminating NULL, add 1
 687                                  */
 688                                 temp_size_needed += ((acpi_size)
 689                                                      (*sub_object_list)->string.
 690                                                      length + 1);
 691                         } else {
 692                                 temp_size_needed += acpi_ns_get_pathname_length((*sub_object_list)->reference.node);
 693                         }
 694                 } else {
 695                         /*
 696                          * If no name was found, then this is a NULL, which is
 697                          * translated as a u32 zero.
 698                          */
 699                         temp_size_needed += sizeof(u32);
 700                 }
 701
 702                 /* Round up the size since each element must be aligned */
 703
 704                 temp_size_needed = ACPI_ROUND_UP_TO_64BIT(temp_size_needed);
 705
 706                 /* Point to the next union acpi_operand_object */
 707
 708                 top_object_list++;
 709         }
 710
 711         /*
 712          * Add an extra element to the end of the list, essentially a
 713          * NULL terminator
 714          */
 715         *buffer_size_needed =
 716             temp_size_needed + sizeof(struct acpi_pci_routing_table);
 717         return_ACPI_STATUS(AE_OK);
 718 }