drivers/acpi/acpica/nsrepair2.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsrepair2 - Repair for objects returned by specific
   4  *                          predefined methods
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2015, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_NAMESPACE
  50 ACPI_MODULE_NAME("nsrepair2")
  51
  52 /*
  53  * Information structure and handler for ACPI predefined names that can
  54  * be repaired on a per-name basis.
  55  */
  56 typedef
  57 acpi_status(*acpi_repair_function) (struct acpi_evaluate_info * info,
  58                                     union acpi_operand_object
  59                                     **return_object_ptr);
  60
  61 typedef struct acpi_repair_info {
  62         char name[ACPI_NAME_SIZE];
  63         acpi_repair_function repair_function;
  64
  65 } acpi_repair_info;
  66
  67 /* Local prototypes */
  68
  69 static const struct acpi_repair_info *acpi_ns_match_complex_repair(struct
  70                                                                    acpi_namespace_node
  71                                                                    *node);
  72
  73 static acpi_status
  74 acpi_ns_repair_ALR(struct acpi_evaluate_info *info,
  75                    union acpi_operand_object **return_object_ptr);
  76
  77 static acpi_status
  78 acpi_ns_repair_CID(struct acpi_evaluate_info *info,
  79                    union acpi_operand_object **return_object_ptr);
  80
  81 static acpi_status
  82 acpi_ns_repair_CST(struct acpi_evaluate_info *info,
  83                    union acpi_operand_object **return_object_ptr);
  84
  85 static acpi_status
  86 acpi_ns_repair_FDE(struct acpi_evaluate_info *info,
  87                    union acpi_operand_object **return_object_ptr);
  88
  89 static acpi_status
  90 acpi_ns_repair_HID(struct acpi_evaluate_info *info,
  91                    union acpi_operand_object **return_object_ptr);
  92
  93 static acpi_status
  94 acpi_ns_repair_PRT(struct acpi_evaluate_info *info,
  95                    union acpi_operand_object **return_object_ptr);
  96
  97 static acpi_status
  98 acpi_ns_repair_PSS(struct acpi_evaluate_info *info,
  99                    union acpi_operand_object **return_object_ptr);
 100
 101 static acpi_status
 102 acpi_ns_repair_TSS(struct acpi_evaluate_info *info,
 103                    union acpi_operand_object **return_object_ptr);
 104
 105 static acpi_status
 106 acpi_ns_check_sorted_list(struct acpi_evaluate_info *info,
 107                           union acpi_operand_object *return_object,
 108                           u32 start_index,
 109                           u32 expected_count,
 110                           u32 sort_index,
 111                           u8 sort_direction, char *sort_key_name);
 112
 113 /* Values for sort_direction above */
 114
 115 #define ACPI_SORT_ASCENDING     0
 116 #define ACPI_SORT_DESCENDING    1
 117
 118 static void
 119 acpi_ns_remove_element(union acpi_operand_object *obj_desc, u32 index);
 120
 121 static void
 122 acpi_ns_sort_list(union acpi_operand_object **elements,
 123                   u32 count, u32 index, u8 sort_direction);
 124
 125 /*
 126  * This table contains the names of the predefined methods for which we can
 127  * perform more complex repairs.
 128  *
 129  * As necessary:
 130  *
 131  * _ALR: Sort the list ascending by ambient_illuminance
 132  * _CID: Strings: uppercase all, remove any leading asterisk
 133  * _CST: Sort the list ascending by C state type
 134  * _FDE: Convert Buffer of BYTEs to a Buffer of DWORDs
 135  * _GTM: Convert Buffer of BYTEs to a Buffer of DWORDs
 136  * _HID: Strings: uppercase all, remove any leading asterisk
 137  * _PRT: Fix reversed source_name and source_index
 138  * _PSS: Sort the list descending by Power
 139  * _TSS: Sort the list descending by Power
 140  *
 141  * Names that must be packages, but cannot be sorted:
 142  *
 143  * _BCL: Values are tied to the Package index where they appear, and cannot
 144  * be moved or sorted. These index values are used for _BQC and _BCM.
 145  * However, we can fix the case where a buffer is returned, by converting
 146  * it to a Package of integers.
 147  */
 148 static const struct acpi_repair_info acpi_ns_repairable_names[] = {
 149         {"_ALR", acpi_ns_repair_ALR},
 150         {"_CID", acpi_ns_repair_CID},
 151         {"_CST", acpi_ns_repair_CST},
 152         {"_FDE", acpi_ns_repair_FDE},
 153         {"_GTM", acpi_ns_repair_FDE},   /* _GTM has same repair as _FDE */
 154         {"_HID", acpi_ns_repair_HID},
 155         {"_PRT", acpi_ns_repair_PRT},
 156         {"_PSS", acpi_ns_repair_PSS},
 157         {"_TSS", acpi_ns_repair_TSS},
 158         {{0, 0, 0, 0}, NULL}    /* Table terminator */
 159 };
 160
 161 #define ACPI_FDE_FIELD_COUNT        5
 162 #define ACPI_FDE_BYTE_BUFFER_SIZE   5
 163 #define ACPI_FDE_DWORD_BUFFER_SIZE  (ACPI_FDE_FIELD_COUNT * sizeof (u32))
 164
 165 /******************************************************************************
 166  *
 167  * FUNCTION:    acpi_ns_complex_repairs
 168  *
 169  * PARAMETERS:  info                - Method execution information block
 170  *              node                - Namespace node for the method/object
 171  *              validate_status     - Original status of earlier validation
 172  *              return_object_ptr   - Pointer to the object returned from the
 173  *                                    evaluation of a method or object
 174  *
 175  * RETURN:      Status. AE_OK if repair was successful. If name is not
 176  *              matched, validate_status is returned.
 177  *
 178  * DESCRIPTION: Attempt to repair/convert a return object of a type that was
 179  *              not expected.
 180  *
 181  *****************************************************************************/
 182
 183 acpi_status
 184 acpi_ns_complex_repairs(struct acpi_evaluate_info *info,
 185                         struct acpi_namespace_node *node,
 186                         acpi_status validate_status,
 187                         union acpi_operand_object **return_object_ptr)
 188 {
 189         const struct acpi_repair_info *predefined;
 190         acpi_status status;
 191
 192         /* Check if this name is in the list of repairable names */
 193
 194         predefined = acpi_ns_match_complex_repair(node);
 195         if (!predefined) {
 196                 return (validate_status);
 197         }
 198
 199         status = predefined->repair_function(info, return_object_ptr);
 200         return (status);
 201 }
 202
 203 /******************************************************************************
 204  *
 205  * FUNCTION:    acpi_ns_match_complex_repair
 206  *
 207  * PARAMETERS:  node                - Namespace node for the method/object
 208  *
 209  * RETURN:      Pointer to entry in repair table. NULL indicates not found.
 210  *
 211  * DESCRIPTION: Check an object name against the repairable object list.
 212  *
 213  *****************************************************************************/
 214
 215 static const struct acpi_repair_info *acpi_ns_match_complex_repair(struct
 216                                                                    acpi_namespace_node
 217                                                                    *node)
 218 {
 219         const struct acpi_repair_info *this_name;
 220
 221         /* Search info table for a repairable predefined method/object name */
 222
 223         this_name = acpi_ns_repairable_names;
 224         while (this_name->repair_function) {
 225                 if (ACPI_COMPARE_NAME(node->name.ascii, this_name->name)) {
 226                         return (this_name);
 227                 }
 228                 this_name++;
 229         }
 230
 231         return (NULL);          /* Not found */
 232 }
 233
 234 /******************************************************************************
 235  *
 236  * FUNCTION:    acpi_ns_repair_ALR
 237  *
 238  * PARAMETERS:  info                - Method execution information block
 239  *              return_object_ptr   - Pointer to the object returned from the
 240  *                                    evaluation of a method or object
 241  *
 242  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 243  *
 244  * DESCRIPTION: Repair for the _ALR object. If necessary, sort the object list
 245  *              ascending by the ambient illuminance values.
 246  *
 247  *****************************************************************************/
 248
 249 static acpi_status
 250 acpi_ns_repair_ALR(struct acpi_evaluate_info *info,
 251                    union acpi_operand_object **return_object_ptr)
 252 {
 253         union acpi_operand_object *return_object = *return_object_ptr;
 254         acpi_status status;
 255
 256         status = acpi_ns_check_sorted_list(info, return_object, 0, 2, 1,
 257                                            ACPI_SORT_ASCENDING,
 258                                            "AmbientIlluminance");
 259
 260         return (status);
 261 }
 262
 263 /******************************************************************************
 264  *
 265  * FUNCTION:    acpi_ns_repair_FDE
 266  *
 267  * PARAMETERS:  info                - Method execution information block
 268  *              return_object_ptr   - Pointer to the object returned from the
 269  *                                    evaluation of a method or object
 270  *
 271  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 272  *
 273  * DESCRIPTION: Repair for the _FDE and _GTM objects. The expected return
 274  *              value is a Buffer of 5 DWORDs. This function repairs a common
 275  *              problem where the return value is a Buffer of BYTEs, not
 276  *              DWORDs.
 277  *
 278  *****************************************************************************/
 279
 280 static acpi_status
 281 acpi_ns_repair_FDE(struct acpi_evaluate_info *info,
 282                    union acpi_operand_object **return_object_ptr)
 283 {
 284         union acpi_operand_object *return_object = *return_object_ptr;
 285         union acpi_operand_object *buffer_object;
 286         u8 *byte_buffer;
 287         u32 *dword_buffer;
 288         u32 i;
 289
 290         ACPI_FUNCTION_NAME(ns_repair_FDE);
 291
 292         switch (return_object->common.type) {
 293         case ACPI_TYPE_BUFFER:
 294
 295                 /* This is the expected type. Length should be (at least) 5 DWORDs */
 296
 297                 if (return_object->buffer.length >= ACPI_FDE_DWORD_BUFFER_SIZE) {
 298                         return (AE_OK);
 299                 }
 300
 301                 /* We can only repair if we have exactly 5 BYTEs */
 302
 303                 if (return_object->buffer.length != ACPI_FDE_BYTE_BUFFER_SIZE) {
 304                         ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 305                                               info->node_flags,
 306                                               "Incorrect return buffer length %u, expected %u",
 307                                               return_object->buffer.length,
 308                                               ACPI_FDE_DWORD_BUFFER_SIZE));
 309
 310                         return (AE_AML_OPERAND_TYPE);
 311                 }
 312
 313                 /* Create the new (larger) buffer object */
 314
 315                 buffer_object =
 316                     acpi_ut_create_buffer_object(ACPI_FDE_DWORD_BUFFER_SIZE);
 317                 if (!buffer_object) {
 318                         return (AE_NO_MEMORY);
 319                 }
 320
 321                 /* Expand each byte to a DWORD */
 322
 323                 byte_buffer = return_object->buffer.pointer;
 324                 dword_buffer =
 325                     ACPI_CAST_PTR(u32, buffer_object->buffer.pointer);
 326
 327                 for (i = 0; i < ACPI_FDE_FIELD_COUNT; i++) {
 328                         *dword_buffer = (u32) *byte_buffer;
 329                         dword_buffer++;
 330                         byte_buffer++;
 331                 }
 332
 333                 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 334                                   "%s Expanded Byte Buffer to expected DWord Buffer\n",
 335                                   info->full_pathname));
 336                 break;
 337
 338         default:
 339
 340                 return (AE_AML_OPERAND_TYPE);
 341         }
 342
 343         /* Delete the original return object, return the new buffer object */
 344
 345         acpi_ut_remove_reference(return_object);
 346         *return_object_ptr = buffer_object;
 347
 348         info->return_flags |= ACPI_OBJECT_REPAIRED;
 349         return (AE_OK);
 350 }
 351
 352 /******************************************************************************
 353  *
 354  * FUNCTION:    acpi_ns_repair_CID
 355  *
 356  * PARAMETERS:  info                - Method execution information block
 357  *              return_object_ptr   - Pointer to the object returned from the
 358  *                                    evaluation of a method or object
 359  *
 360  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 361  *
 362  * DESCRIPTION: Repair for the _CID object. If a string, ensure that all
 363  *              letters are uppercase and that there is no leading asterisk.
 364  *              If a Package, ensure same for all string elements.
 365  *
 366  *****************************************************************************/
 367
 368 static acpi_status
 369 acpi_ns_repair_CID(struct acpi_evaluate_info *info,
 370                    union acpi_operand_object **return_object_ptr)
 371 {
 372         acpi_status status;
 373         union acpi_operand_object *return_object = *return_object_ptr;
 374         union acpi_operand_object **element_ptr;
 375         union acpi_operand_object *original_element;
 376         u16 original_ref_count;
 377         u32 i;
 378
 379         /* Check for _CID as a simple string */
 380
 381         if (return_object->common.type == ACPI_TYPE_STRING) {
 382                 status = acpi_ns_repair_HID(info, return_object_ptr);
 383                 return (status);
 384         }
 385
 386         /* Exit if not a Package */
 387
 388         if (return_object->common.type != ACPI_TYPE_PACKAGE) {
 389                 return (AE_OK);
 390         }
 391
 392         /* Examine each element of the _CID package */
 393
 394         element_ptr = return_object->package.elements;
 395         for (i = 0; i < return_object->package.count; i++) {
 396                 original_element = *element_ptr;
 397                 original_ref_count = original_element->common.reference_count;
 398
 399                 status = acpi_ns_repair_HID(info, element_ptr);
 400                 if (ACPI_FAILURE(status)) {
 401                         return (status);
 402                 }
 403
 404                 /* Take care with reference counts */
 405
 406                 if (original_element != *element_ptr) {
 407
 408                         /* Element was replaced */
 409
 410                         (*element_ptr)->common.reference_count =
 411                             original_ref_count;
 412
 413                         acpi_ut_remove_reference(original_element);
 414                 }
 415
 416                 element_ptr++;
 417         }
 418
 419         return (AE_OK);
 420 }
 421
 422 /******************************************************************************
 423  *
 424  * FUNCTION:    acpi_ns_repair_CST
 425  *
 426  * PARAMETERS:  info                - Method execution information block
 427  *              return_object_ptr   - Pointer to the object returned from the
 428  *                                    evaluation of a method or object
 429  *
 430  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 431  *
 432  * DESCRIPTION: Repair for the _CST object:
 433  *              1. Sort the list ascending by C state type
 434  *              2. Ensure type cannot be zero
 435  *              3. A subpackage count of zero means _CST is meaningless
 436  *              4. Count must match the number of C state subpackages
 437  *
 438  *****************************************************************************/
 439
 440 static acpi_status
 441 acpi_ns_repair_CST(struct acpi_evaluate_info *info,
 442                    union acpi_operand_object **return_object_ptr)
 443 {
 444         union acpi_operand_object *return_object = *return_object_ptr;
 445         union acpi_operand_object **outer_elements;
 446         u32 outer_element_count;
 447         union acpi_operand_object *obj_desc;
 448         acpi_status status;
 449         u8 removing;
 450         u32 i;
 451
 452         ACPI_FUNCTION_NAME(ns_repair_CST);
 453
 454         /*
 455          * Check if the C-state type values are proportional.
 456          */
 457         outer_element_count = return_object->package.count - 1;
 458         i = 0;
 459         while (i < outer_element_count) {
 460                 outer_elements = &return_object->package.elements[i + 1];
 461                 removing = FALSE;
 462
 463                 if ((*outer_elements)->package.count == 0) {
 464                         ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 465                                               info->node_flags,
 466                                               "SubPackage[%u] - removing entry due to zero count",
 467                                               i));
 468                         removing = TRUE;
 469                         goto remove_element;
 470                 }
 471
 472                 obj_desc = (*outer_elements)->package.elements[1];      /* Index1 = Type */
 473                 if ((u32)obj_desc->integer.value == 0) {
 474                         ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 475                                               info->node_flags,
 476                                               "SubPackage[%u] - removing entry due to invalid Type(0)",
 477                                               i));
 478                         removing = TRUE;
 479                 }
 480
 481 remove_element:
 482                 if (removing) {
 483                         acpi_ns_remove_element(return_object, i + 1);
 484                         outer_element_count--;
 485                 } else {
 486                         i++;
 487                 }
 488         }
 489
 490         /* Update top-level package count, Type "Integer" checked elsewhere */
 491
 492         obj_desc = return_object->package.elements[0];
 493         obj_desc->integer.value = outer_element_count;
 494
 495         /*
 496          * Entries (subpackages) in the _CST Package must be sorted by the
 497          * C-state type, in ascending order.
 498          */
 499         status = acpi_ns_check_sorted_list(info, return_object, 1, 4, 1,
 500                                            ACPI_SORT_ASCENDING, "C-State Type");
 501         if (ACPI_FAILURE(status)) {
 502                 return (status);
 503         }
 504
 505         return (AE_OK);
 506 }
 507
 508 /******************************************************************************
 509  *
 510  * FUNCTION:    acpi_ns_repair_HID
 511  *
 512  * PARAMETERS:  info                - Method execution information block
 513  *              return_object_ptr   - Pointer to the object returned from the
 514  *                                    evaluation of a method or object
 515  *
 516  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 517  *
 518  * DESCRIPTION: Repair for the _HID object. If a string, ensure that all
 519  *              letters are uppercase and that there is no leading asterisk.
 520  *
 521  *****************************************************************************/
 522
 523 static acpi_status
 524 acpi_ns_repair_HID(struct acpi_evaluate_info *info,
 525                    union acpi_operand_object **return_object_ptr)
 526 {
 527         union acpi_operand_object *return_object = *return_object_ptr;
 528         union acpi_operand_object *new_string;
 529         char *source;
 530         char *dest;
 531
 532         ACPI_FUNCTION_NAME(ns_repair_HID);
 533
 534         /* We only care about string _HID objects (not integers) */
 535
 536         if (return_object->common.type != ACPI_TYPE_STRING) {
 537                 return (AE_OK);
 538         }
 539
 540         if (return_object->string.length == 0) {
 541                 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 542                                       info->node_flags,
 543                                       "Invalid zero-length _HID or _CID string"));
 544
 545                 /* Return AE_OK anyway, let driver handle it */
 546
 547                 info->return_flags |= ACPI_OBJECT_REPAIRED;
 548                 return (AE_OK);
 549         }
 550
 551         /* It is simplest to always create a new string object */
 552
 553         new_string = acpi_ut_create_string_object(return_object->string.length);
 554         if (!new_string) {
 555                 return (AE_NO_MEMORY);
 556         }
 557
 558         /*
 559          * Remove a leading asterisk if present. For some unknown reason, there
 560          * are many machines in the field that contains IDs like this.
 561          *
 562          * Examples: "*PNP0C03", "*ACPI0003"
 563          */
 564         source = return_object->string.pointer;
 565         if (*source == '*') {
 566                 source++;
 567                 new_string->string.length--;
 568
 569                 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 570                                   "%s: Removed invalid leading asterisk\n",
 571                                   info->full_pathname));
 572         }
 573
 574         /*
 575          * Copy and uppercase the string. From the ACPI 5.0 specification:
 576          *
 577          * A valid PNP ID must be of the form "AAA####" where A is an uppercase
 578          * letter and # is a hex digit. A valid ACPI ID must be of the form
 579          * "NNNN####" where N is an uppercase letter or decimal digit, and
 580          * # is a hex digit.
 581          */
 582         for (dest = new_string->string.pointer; *source; dest++, source++) {
 583                 *dest = (char)ACPI_TOUPPER(*source);
 584         }
 585
 586         acpi_ut_remove_reference(return_object);
 587         *return_object_ptr = new_string;
 588         return (AE_OK);
 589 }
 590
 591 /******************************************************************************
 592  *
 593  * FUNCTION:    acpi_ns_repair_PRT
 594  *
 595  * PARAMETERS:  info                - Method execution information block
 596  *              return_object_ptr   - Pointer to the object returned from the
 597  *                                    evaluation of a method or object
 598  *
 599  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 600  *
 601  * DESCRIPTION: Repair for the _PRT object. If necessary, fix reversed
 602  *              source_name and source_index field, a common BIOS bug.
 603  *
 604  *****************************************************************************/
 605
 606 static acpi_status
 607 acpi_ns_repair_PRT(struct acpi_evaluate_info *info,
 608                    union acpi_operand_object **return_object_ptr)
 609 {
 610         union acpi_operand_object *package_object = *return_object_ptr;
 611         union acpi_operand_object **top_object_list;
 612         union acpi_operand_object **sub_object_list;
 613         union acpi_operand_object *obj_desc;
 614         union acpi_operand_object *sub_package;
 615         u32 element_count;
 616         u32 index;
 617
 618         /* Each element in the _PRT package is a subpackage */
 619
 620         top_object_list = package_object->package.elements;
 621         element_count = package_object->package.count;
 622
 623         /* Examine each subpackage */
 624
 625         for (index = 0; index < element_count; index++, top_object_list++) {
 626                 sub_package = *top_object_list;
 627                 sub_object_list = sub_package->package.elements;
 628
 629                 /* Check for minimum required element count */
 630
 631                 if (sub_package->package.count < 4) {
 632                         continue;
 633                 }
 634
 635                 /*
 636                  * If the BIOS has erroneously reversed the _PRT source_name (index 2)
 637                  * and the source_index (index 3), fix it. _PRT is important enough to
 638                  * workaround this BIOS error. This also provides compatibility with
 639                  * other ACPI implementations.
 640                  */
 641                 obj_desc = sub_object_list[3];
 642                 if (!obj_desc || (obj_desc->common.type != ACPI_TYPE_INTEGER)) {
 643                         sub_object_list[3] = sub_object_list[2];
 644                         sub_object_list[2] = obj_desc;
 645                         info->return_flags |= ACPI_OBJECT_REPAIRED;
 646
 647                         ACPI_WARN_PREDEFINED((AE_INFO,
 648                                               info->full_pathname,
 649                                               info->node_flags,
 650                                               "PRT[%X]: Fixed reversed SourceName and SourceIndex",
 651                                               index));
 652                 }
 653         }
 654
 655         return (AE_OK);
 656 }
 657
 658 /******************************************************************************
 659  *
 660  * FUNCTION:    acpi_ns_repair_PSS
 661  *
 662  * PARAMETERS:  info                - Method execution information block
 663  *              return_object_ptr   - Pointer to the object returned from the
 664  *                                    evaluation of a method or object
 665  *
 666  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 667  *
 668  * DESCRIPTION: Repair for the _PSS object. If necessary, sort the object list
 669  *              by the CPU frequencies. Check that the power dissipation values
 670  *              are all proportional to CPU frequency (i.e., sorting by
 671  *              frequency should be the same as sorting by power.)
 672  *
 673  *****************************************************************************/
 674
 675 static acpi_status
 676 acpi_ns_repair_PSS(struct acpi_evaluate_info *info,
 677                    union acpi_operand_object **return_object_ptr)
 678 {
 679         union acpi_operand_object *return_object = *return_object_ptr;
 680         union acpi_operand_object **outer_elements;
 681         u32 outer_element_count;
 682         union acpi_operand_object **elements;
 683         union acpi_operand_object *obj_desc;
 684         u32 previous_value;
 685         acpi_status status;
 686         u32 i;
 687
 688         /*
 689          * Entries (subpackages) in the _PSS Package must be sorted by power
 690          * dissipation, in descending order. If it appears that the list is
 691          * incorrectly sorted, sort it. We sort by cpu_frequency, since this
 692          * should be proportional to the power.
 693          */
 694         status = acpi_ns_check_sorted_list(info, return_object, 0, 6, 0,
 695                                            ACPI_SORT_DESCENDING,
 696                                            "CpuFrequency");
 697         if (ACPI_FAILURE(status)) {
 698                 return (status);
 699         }
 700
 701         /*
 702          * We now know the list is correctly sorted by CPU frequency. Check if
 703          * the power dissipation values are proportional.
 704          */
 705         previous_value = ACPI_UINT32_MAX;
 706         outer_elements = return_object->package.elements;
 707         outer_element_count = return_object->package.count;
 708
 709         for (i = 0; i < outer_element_count; i++) {
 710                 elements = (*outer_elements)->package.elements;
 711                 obj_desc = elements[1]; /* Index1 = power_dissipation */
 712
 713                 if ((u32) obj_desc->integer.value > previous_value) {
 714                         ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 715                                               info->node_flags,
 716                                               "SubPackage[%u,%u] - suspicious power dissipation values",
 717                                               i - 1, i));
 718                 }
 719
 720                 previous_value = (u32) obj_desc->integer.value;
 721                 outer_elements++;
 722         }
 723
 724         return (AE_OK);
 725 }
 726
 727 /******************************************************************************
 728  *
 729  * FUNCTION:    acpi_ns_repair_TSS
 730  *
 731  * PARAMETERS:  info                - Method execution information block
 732  *              return_object_ptr   - Pointer to the object returned from the
 733  *                                    evaluation of a method or object
 734  *
 735  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 736  *
 737  * DESCRIPTION: Repair for the _TSS object. If necessary, sort the object list
 738  *              descending by the power dissipation values.
 739  *
 740  *****************************************************************************/
 741
 742 static acpi_status
 743 acpi_ns_repair_TSS(struct acpi_evaluate_info *info,
 744                    union acpi_operand_object **return_object_ptr)
 745 {
 746         union acpi_operand_object *return_object = *return_object_ptr;
 747         acpi_status status;
 748         struct acpi_namespace_node *node;
 749
 750         /*
 751          * We can only sort the _TSS return package if there is no _PSS in the
 752          * same scope. This is because if _PSS is present, the ACPI specification
 753          * dictates that the _TSS Power Dissipation field is to be ignored, and
 754          * therefore some BIOSs leave garbage values in the _TSS Power field(s).
 755          * In this case, it is best to just return the _TSS package as-is.
 756          * (May, 2011)
 757          */
 758         status = acpi_ns_get_node(info->node, "^_PSS",
 759                                   ACPI_NS_NO_UPSEARCH, &node);
 760         if (ACPI_SUCCESS(status)) {
 761                 return (AE_OK);
 762         }
 763
 764         status = acpi_ns_check_sorted_list(info, return_object, 0, 5, 1,
 765                                            ACPI_SORT_DESCENDING,
 766                                            "PowerDissipation");
 767
 768         return (status);
 769 }
 770
 771 /******************************************************************************
 772  *
 773  * FUNCTION:    acpi_ns_check_sorted_list
 774  *
 775  * PARAMETERS:  info                - Method execution information block
 776  *              return_object       - Pointer to the top-level returned object
 777  *              start_index         - Index of the first subpackage
 778  *              expected_count      - Minimum length of each subpackage
 779  *              sort_index          - Subpackage entry to sort on
 780  *              sort_direction      - Ascending or descending
 781  *              sort_key_name       - Name of the sort_index field
 782  *
 783  * RETURN:      Status. AE_OK if the list is valid and is sorted correctly or
 784  *              has been repaired by sorting the list.
 785  *
 786  * DESCRIPTION: Check if the package list is valid and sorted correctly by the
 787  *              sort_index. If not, then sort the list.
 788  *
 789  *****************************************************************************/
 790
 791 static acpi_status
 792 acpi_ns_check_sorted_list(struct acpi_evaluate_info *info,
 793                           union acpi_operand_object *return_object,
 794                           u32 start_index,
 795                           u32 expected_count,
 796                           u32 sort_index,
 797                           u8 sort_direction, char *sort_key_name)
 798 {
 799         u32 outer_element_count;
 800         union acpi_operand_object **outer_elements;
 801         union acpi_operand_object **elements;
 802         union acpi_operand_object *obj_desc;
 803         u32 i;
 804         u32 previous_value;
 805
 806         ACPI_FUNCTION_NAME(ns_check_sorted_list);
 807
 808         /* The top-level object must be a package */
 809
 810         if (return_object->common.type != ACPI_TYPE_PACKAGE) {
 811                 return (AE_AML_OPERAND_TYPE);
 812         }
 813
 814         /*
 815          * NOTE: assumes list of subpackages contains no NULL elements.
 816          * Any NULL elements should have been removed by earlier call
 817          * to acpi_ns_remove_null_elements.
 818          */
 819         outer_element_count = return_object->package.count;
 820         if (!outer_element_count || start_index >= outer_element_count) {
 821                 return (AE_AML_PACKAGE_LIMIT);
 822         }
 823
 824         outer_elements = &return_object->package.elements[start_index];
 825         outer_element_count -= start_index;
 826
 827         previous_value = 0;
 828         if (sort_direction == ACPI_SORT_DESCENDING) {
 829                 previous_value = ACPI_UINT32_MAX;
 830         }
 831
 832         /* Examine each subpackage */
 833
 834         for (i = 0; i < outer_element_count; i++) {
 835
 836                 /* Each element of the top-level package must also be a package */
 837
 838                 if ((*outer_elements)->common.type != ACPI_TYPE_PACKAGE) {
 839                         return (AE_AML_OPERAND_TYPE);
 840                 }
 841
 842                 /* Each subpackage must have the minimum length */
 843
 844                 if ((*outer_elements)->package.count < expected_count) {
 845                         return (AE_AML_PACKAGE_LIMIT);
 846                 }
 847
 848                 elements = (*outer_elements)->package.elements;
 849                 obj_desc = elements[sort_index];
 850
 851                 if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
 852                         return (AE_AML_OPERAND_TYPE);
 853                 }
 854
 855                 /*
 856                  * The list must be sorted in the specified order. If we detect a
 857                  * discrepancy, sort the entire list.
 858                  */
 859                 if (((sort_direction == ACPI_SORT_ASCENDING) &&
 860                      (obj_desc->integer.value < previous_value)) ||
 861                     ((sort_direction == ACPI_SORT_DESCENDING) &&
 862                      (obj_desc->integer.value > previous_value))) {
 863                         acpi_ns_sort_list(&return_object->package.
 864                                           elements[start_index],
 865                                           outer_element_count, sort_index,
 866                                           sort_direction);
 867
 868                         info->return_flags |= ACPI_OBJECT_REPAIRED;
 869
 870                         ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 871                                           "%s: Repaired unsorted list - now sorted by %s\n",
 872                                           info->full_pathname, sort_key_name));
 873                         return (AE_OK);
 874                 }
 875
 876                 previous_value = (u32) obj_desc->integer.value;
 877                 outer_elements++;
 878         }
 879
 880         return (AE_OK);
 881 }
 882
 883 /******************************************************************************
 884  *
 885  * FUNCTION:    acpi_ns_sort_list
 886  *
 887  * PARAMETERS:  elements            - Package object element list
 888  *              count               - Element count for above
 889  *              index               - Sort by which package element
 890  *              sort_direction      - Ascending or Descending sort
 891  *
 892  * RETURN:      None
 893  *
 894  * DESCRIPTION: Sort the objects that are in a package element list.
 895  *
 896  * NOTE: Assumes that all NULL elements have been removed from the package,
 897  *       and that all elements have been verified to be of type Integer.
 898  *
 899  *****************************************************************************/
 900
 901 static void
 902 acpi_ns_sort_list(union acpi_operand_object **elements,
 903                   u32 count, u32 index, u8 sort_direction)
 904 {
 905         union acpi_operand_object *obj_desc1;
 906         union acpi_operand_object *obj_desc2;
 907         union acpi_operand_object *temp_obj;
 908         u32 i;
 909         u32 j;
 910
 911         /* Simple bubble sort */
 912
 913         for (i = 1; i < count; i++) {
 914                 for (j = (count - 1); j >= i; j--) {
 915                         obj_desc1 = elements[j - 1]->package.elements[index];
 916                         obj_desc2 = elements[j]->package.elements[index];
 917
 918                         if (((sort_direction == ACPI_SORT_ASCENDING) &&
 919                              (obj_desc1->integer.value >
 920                               obj_desc2->integer.value))
 921                             || ((sort_direction == ACPI_SORT_DESCENDING)
 922                                 && (obj_desc1->integer.value <
 923                                     obj_desc2->integer.value))) {
 924                                 temp_obj = elements[j - 1];
 925                                 elements[j - 1] = elements[j];
 926                                 elements[j] = temp_obj;
 927                         }
 928                 }
 929         }
 930 }
 931
 932 /******************************************************************************
 933  *
 934  * FUNCTION:    acpi_ns_remove_element
 935  *
 936  * PARAMETERS:  obj_desc            - Package object element list
 937  *              index               - Index of element to remove
 938  *
 939  * RETURN:      None
 940  *
 941  * DESCRIPTION: Remove the requested element of a package and delete it.
 942  *
 943  *****************************************************************************/
 944
 945 static void
 946 acpi_ns_remove_element(union acpi_operand_object *obj_desc, u32 index)
 947 {
 948         union acpi_operand_object **source;
 949         union acpi_operand_object **dest;
 950         u32 count;
 951         u32 new_count;
 952         u32 i;
 953
 954         ACPI_FUNCTION_NAME(ns_remove_element);
 955
 956         count = obj_desc->package.count;
 957         new_count = count - 1;
 958
 959         source = obj_desc->package.elements;
 960         dest = source;
 961
 962         /* Examine all elements of the package object, remove matched index */
 963
 964         for (i = 0; i < count; i++) {
 965                 if (i == index) {
 966                         acpi_ut_remove_reference(*source);      /* Remove one ref for being in pkg */
 967                         acpi_ut_remove_reference(*source);
 968                 } else {
 969                         *dest = *source;
 970                         dest++;
 971                 }
 972                 source++;
 973         }
 974
 975         /* NULL terminate list and update the package count */
 976
 977         *dest = NULL;
 978         obj_desc->package.count = new_count;
 979 }