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 - 2016, 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
 229                 this_name++;
 230         }
 231
 232         return (NULL);          /* Not found */
 233 }
 234
 235 /******************************************************************************
 236  *
 237  * FUNCTION:    acpi_ns_repair_ALR
 238  *
 239  * PARAMETERS:  info                - Method execution information block
 240  *              return_object_ptr   - Pointer to the object returned from the
 241  *                                    evaluation of a method or object
 242  *
 243  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 244  *
 245  * DESCRIPTION: Repair for the _ALR object. If necessary, sort the object list
 246  *              ascending by the ambient illuminance values.
 247  *
 248  *****************************************************************************/
 249
 250 static acpi_status
 251 acpi_ns_repair_ALR(struct acpi_evaluate_info *info,
 252                    union acpi_operand_object **return_object_ptr)
 253 {
 254         union acpi_operand_object *return_object = *return_object_ptr;
 255         acpi_status status;
 256
 257         status = acpi_ns_check_sorted_list(info, return_object, 0, 2, 1,
 258                                            ACPI_SORT_ASCENDING,
 259                                            "AmbientIlluminance");
 260
 261         return (status);
 262 }
 263
 264 /******************************************************************************
 265  *
 266  * FUNCTION:    acpi_ns_repair_FDE
 267  *
 268  * PARAMETERS:  info                - Method execution information block
 269  *              return_object_ptr   - Pointer to the object returned from the
 270  *                                    evaluation of a method or object
 271  *
 272  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 273  *
 274  * DESCRIPTION: Repair for the _FDE and _GTM objects. The expected return
 275  *              value is a Buffer of 5 DWORDs. This function repairs a common
 276  *              problem where the return value is a Buffer of BYTEs, not
 277  *              DWORDs.
 278  *
 279  *****************************************************************************/
 280
 281 static acpi_status
 282 acpi_ns_repair_FDE(struct acpi_evaluate_info *info,
 283                    union acpi_operand_object **return_object_ptr)
 284 {
 285         union acpi_operand_object *return_object = *return_object_ptr;
 286         union acpi_operand_object *buffer_object;
 287         u8 *byte_buffer;
 288         u32 *dword_buffer;
 289         u32 i;
 290
 291         ACPI_FUNCTION_NAME(ns_repair_FDE);
 292
 293         switch (return_object->common.type) {
 294         case ACPI_TYPE_BUFFER:
 295
 296                 /* This is the expected type. Length should be (at least) 5 DWORDs */
 297
 298                 if (return_object->buffer.length >= ACPI_FDE_DWORD_BUFFER_SIZE) {
 299                         return (AE_OK);
 300                 }
 301
 302                 /* We can only repair if we have exactly 5 BYTEs */
 303
 304                 if (return_object->buffer.length != ACPI_FDE_BYTE_BUFFER_SIZE) {
 305                         ACPI_WARN_PREDEFINED((AE_INFO,
 306                                               info->full_pathname,
 307                                               info->node_flags,
 308                                               "Incorrect return buffer length %u, expected %u",
 309                                               return_object->buffer.length,
 310                                               ACPI_FDE_DWORD_BUFFER_SIZE));
 311
 312                         return (AE_AML_OPERAND_TYPE);
 313                 }
 314
 315                 /* Create the new (larger) buffer object */
 316
 317                 buffer_object =
 318                     acpi_ut_create_buffer_object(ACPI_FDE_DWORD_BUFFER_SIZE);
 319                 if (!buffer_object) {
 320                         return (AE_NO_MEMORY);
 321                 }
 322
 323                 /* Expand each byte to a DWORD */
 324
 325                 byte_buffer = return_object->buffer.pointer;
 326                 dword_buffer = ACPI_CAST_PTR(u32,
 327                                              buffer_object->buffer.pointer);
 328
 329                 for (i = 0; i < ACPI_FDE_FIELD_COUNT; i++) {
 330                         *dword_buffer = (u32) *byte_buffer;
 331                         dword_buffer++;
 332                         byte_buffer++;
 333                 }
 334
 335                 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 336                                   "%s Expanded Byte Buffer to expected DWord Buffer\n",
 337                                   info->full_pathname));
 338                 break;
 339
 340         default:
 341
 342                 return (AE_AML_OPERAND_TYPE);
 343         }
 344
 345         /* Delete the original return object, return the new buffer object */
 346
 347         acpi_ut_remove_reference(return_object);
 348         *return_object_ptr = buffer_object;
 349
 350         info->return_flags |= ACPI_OBJECT_REPAIRED;
 351         return (AE_OK);
 352 }
 353
 354 /******************************************************************************
 355  *
 356  * FUNCTION:    acpi_ns_repair_CID
 357  *
 358  * PARAMETERS:  info                - Method execution information block
 359  *              return_object_ptr   - Pointer to the object returned from the
 360  *                                    evaluation of a method or object
 361  *
 362  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 363  *
 364  * DESCRIPTION: Repair for the _CID object. If a string, ensure that all
 365  *              letters are uppercase and that there is no leading asterisk.
 366  *              If a Package, ensure same for all string elements.
 367  *
 368  *****************************************************************************/
 369
 370 static acpi_status
 371 acpi_ns_repair_CID(struct acpi_evaluate_info *info,
 372                    union acpi_operand_object **return_object_ptr)
 373 {
 374         acpi_status status;
 375         union acpi_operand_object *return_object = *return_object_ptr;
 376         union acpi_operand_object **element_ptr;
 377         union acpi_operand_object *original_element;
 378         u16 original_ref_count;
 379         u32 i;
 380
 381         /* Check for _CID as a simple string */
 382
 383         if (return_object->common.type == ACPI_TYPE_STRING) {
 384                 status = acpi_ns_repair_HID(info, return_object_ptr);
 385                 return (status);
 386         }
 387
 388         /* Exit if not a Package */
 389
 390         if (return_object->common.type != ACPI_TYPE_PACKAGE) {
 391                 return (AE_OK);
 392         }
 393
 394         /* Examine each element of the _CID package */
 395
 396         element_ptr = return_object->package.elements;
 397         for (i = 0; i < return_object->package.count; i++) {
 398                 original_element = *element_ptr;
 399                 original_ref_count = original_element->common.reference_count;
 400
 401                 status = acpi_ns_repair_HID(info, element_ptr);
 402                 if (ACPI_FAILURE(status)) {
 403                         return (status);
 404                 }
 405
 406                 /* Take care with reference counts */
 407
 408                 if (original_element != *element_ptr) {
 409
 410                         /* Element was replaced */
 411
 412                         (*element_ptr)->common.reference_count =
 413                             original_ref_count;
 414
 415                         acpi_ut_remove_reference(original_element);
 416                 }
 417
 418                 element_ptr++;
 419         }
 420
 421         return (AE_OK);
 422 }
 423
 424 /******************************************************************************
 425  *
 426  * FUNCTION:    acpi_ns_repair_CST
 427  *
 428  * PARAMETERS:  info                - Method execution information block
 429  *              return_object_ptr   - Pointer to the object returned from the
 430  *                                    evaluation of a method or object
 431  *
 432  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 433  *
 434  * DESCRIPTION: Repair for the _CST object:
 435  *              1. Sort the list ascending by C state type
 436  *              2. Ensure type cannot be zero
 437  *              3. A subpackage count of zero means _CST is meaningless
 438  *              4. Count must match the number of C state subpackages
 439  *
 440  *****************************************************************************/
 441
 442 static acpi_status
 443 acpi_ns_repair_CST(struct acpi_evaluate_info *info,
 444                    union acpi_operand_object **return_object_ptr)
 445 {
 446         union acpi_operand_object *return_object = *return_object_ptr;
 447         union acpi_operand_object **outer_elements;
 448         u32 outer_element_count;
 449         union acpi_operand_object *obj_desc;
 450         acpi_status status;
 451         u8 removing;
 452         u32 i;
 453
 454         ACPI_FUNCTION_NAME(ns_repair_CST);
 455
 456         /*
 457          * Check if the C-state type values are proportional.
 458          */
 459         outer_element_count = return_object->package.count - 1;
 460         i = 0;
 461         while (i < outer_element_count) {
 462                 outer_elements = &return_object->package.elements[i + 1];
 463                 removing = FALSE;
 464
 465                 if ((*outer_elements)->package.count == 0) {
 466                         ACPI_WARN_PREDEFINED((AE_INFO,
 467                                               info->full_pathname,
 468                                               info->node_flags,
 469                                               "SubPackage[%u] - removing entry due to zero count",
 470                                               i));
 471                         removing = TRUE;
 472                         goto remove_element;
 473                 }
 474
 475                 obj_desc = (*outer_elements)->package.elements[1];      /* Index1 = Type */
 476                 if ((u32)obj_desc->integer.value == 0) {
 477                         ACPI_WARN_PREDEFINED((AE_INFO,
 478                                               info->full_pathname,
 479                                               info->node_flags,
 480                                               "SubPackage[%u] - removing entry due to invalid Type(0)",
 481                                               i));
 482                         removing = TRUE;
 483                 }
 484
 485 remove_element:
 486                 if (removing) {
 487                         acpi_ns_remove_element(return_object, i + 1);
 488                         outer_element_count--;
 489                 } else {
 490                         i++;
 491                 }
 492         }
 493
 494         /* Update top-level package count, Type "Integer" checked elsewhere */
 495
 496         obj_desc = return_object->package.elements[0];
 497         obj_desc->integer.value = outer_element_count;
 498
 499         /*
 500          * Entries (subpackages) in the _CST Package must be sorted by the
 501          * C-state type, in ascending order.
 502          */
 503         status = acpi_ns_check_sorted_list(info, return_object, 1, 4, 1,
 504                                            ACPI_SORT_ASCENDING, "C-State Type");
 505         if (ACPI_FAILURE(status)) {
 506                 return (status);
 507         }
 508
 509         return (AE_OK);
 510 }
 511
 512 /******************************************************************************
 513  *
 514  * FUNCTION:    acpi_ns_repair_HID
 515  *
 516  * PARAMETERS:  info                - Method execution information block
 517  *              return_object_ptr   - Pointer to the object returned from the
 518  *                                    evaluation of a method or object
 519  *
 520  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 521  *
 522  * DESCRIPTION: Repair for the _HID object. If a string, ensure that all
 523  *              letters are uppercase and that there is no leading asterisk.
 524  *
 525  *****************************************************************************/
 526
 527 static acpi_status
 528 acpi_ns_repair_HID(struct acpi_evaluate_info *info,
 529                    union acpi_operand_object **return_object_ptr)
 530 {
 531         union acpi_operand_object *return_object = *return_object_ptr;
 532         union acpi_operand_object *new_string;
 533         char *source;
 534         char *dest;
 535
 536         ACPI_FUNCTION_NAME(ns_repair_HID);
 537
 538         /* We only care about string _HID objects (not integers) */
 539
 540         if (return_object->common.type != ACPI_TYPE_STRING) {
 541                 return (AE_OK);
 542         }
 543
 544         if (return_object->string.length == 0) {
 545                 ACPI_WARN_PREDEFINED((AE_INFO,
 546                                       info->full_pathname, info->node_flags,
 547                                       "Invalid zero-length _HID or _CID string"));
 548
 549                 /* Return AE_OK anyway, let driver handle it */
 550
 551                 info->return_flags |= ACPI_OBJECT_REPAIRED;
 552                 return (AE_OK);
 553         }
 554
 555         /* It is simplest to always create a new string object */
 556
 557         new_string = acpi_ut_create_string_object(return_object->string.length);
 558         if (!new_string) {
 559                 return (AE_NO_MEMORY);
 560         }
 561
 562         /*
 563          * Remove a leading asterisk if present. For some unknown reason, there
 564          * are many machines in the field that contains IDs like this.
 565          *
 566          * Examples: "*PNP0C03", "*ACPI0003"
 567          */
 568         source = return_object->string.pointer;
 569         if (*source == '*') {
 570                 source++;
 571                 new_string->string.length--;
 572
 573                 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 574                                   "%s: Removed invalid leading asterisk\n",
 575                                   info->full_pathname));
 576         }
 577
 578         /*
 579          * Copy and uppercase the string. From the ACPI 5.0 specification:
 580          *
 581          * A valid PNP ID must be of the form "AAA####" where A is an uppercase
 582          * letter and # is a hex digit. A valid ACPI ID must be of the form
 583          * "NNNN####" where N is an uppercase letter or decimal digit, and
 584          * # is a hex digit.
 585          */
 586         for (dest = new_string->string.pointer; *source; dest++, source++) {
 587                 *dest = (char)toupper((int)*source);
 588         }
 589
 590         acpi_ut_remove_reference(return_object);
 591         *return_object_ptr = new_string;
 592         return (AE_OK);
 593 }
 594
 595 /******************************************************************************
 596  *
 597  * FUNCTION:    acpi_ns_repair_PRT
 598  *
 599  * PARAMETERS:  info                - Method execution information block
 600  *              return_object_ptr   - Pointer to the object returned from the
 601  *                                    evaluation of a method or object
 602  *
 603  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 604  *
 605  * DESCRIPTION: Repair for the _PRT object. If necessary, fix reversed
 606  *              source_name and source_index field, a common BIOS bug.
 607  *
 608  *****************************************************************************/
 609
 610 static acpi_status
 611 acpi_ns_repair_PRT(struct acpi_evaluate_info *info,
 612                    union acpi_operand_object **return_object_ptr)
 613 {
 614         union acpi_operand_object *package_object = *return_object_ptr;
 615         union acpi_operand_object **top_object_list;
 616         union acpi_operand_object **sub_object_list;
 617         union acpi_operand_object *obj_desc;
 618         union acpi_operand_object *sub_package;
 619         u32 element_count;
 620         u32 index;
 621
 622         /* Each element in the _PRT package is a subpackage */
 623
 624         top_object_list = package_object->package.elements;
 625         element_count = package_object->package.count;
 626
 627         /* Examine each subpackage */
 628
 629         for (index = 0; index < element_count; index++, top_object_list++) {
 630                 sub_package = *top_object_list;
 631                 sub_object_list = sub_package->package.elements;
 632
 633                 /* Check for minimum required element count */
 634
 635                 if (sub_package->package.count < 4) {
 636                         continue;
 637                 }
 638
 639                 /*
 640                  * If the BIOS has erroneously reversed the _PRT source_name (index 2)
 641                  * and the source_index (index 3), fix it. _PRT is important enough to
 642                  * workaround this BIOS error. This also provides compatibility with
 643                  * other ACPI implementations.
 644                  */
 645                 obj_desc = sub_object_list[3];
 646                 if (!obj_desc || (obj_desc->common.type != ACPI_TYPE_INTEGER)) {
 647                         sub_object_list[3] = sub_object_list[2];
 648                         sub_object_list[2] = obj_desc;
 649                         info->return_flags |= ACPI_OBJECT_REPAIRED;
 650
 651                         ACPI_WARN_PREDEFINED((AE_INFO,
 652                                               info->full_pathname,
 653                                               info->node_flags,
 654                                               "PRT[%X]: Fixed reversed SourceName and SourceIndex",
 655                                               index));
 656                 }
 657         }
 658
 659         return (AE_OK);
 660 }
 661
 662 /******************************************************************************
 663  *
 664  * FUNCTION:    acpi_ns_repair_PSS
 665  *
 666  * PARAMETERS:  info                - Method execution information block
 667  *              return_object_ptr   - Pointer to the object returned from the
 668  *                                    evaluation of a method or object
 669  *
 670  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 671  *
 672  * DESCRIPTION: Repair for the _PSS object. If necessary, sort the object list
 673  *              by the CPU frequencies. Check that the power dissipation values
 674  *              are all proportional to CPU frequency (i.e., sorting by
 675  *              frequency should be the same as sorting by power.)
 676  *
 677  *****************************************************************************/
 678
 679 static acpi_status
 680 acpi_ns_repair_PSS(struct acpi_evaluate_info *info,
 681                    union acpi_operand_object **return_object_ptr)
 682 {
 683         union acpi_operand_object *return_object = *return_object_ptr;
 684         union acpi_operand_object **outer_elements;
 685         u32 outer_element_count;
 686         union acpi_operand_object **elements;
 687         union acpi_operand_object *obj_desc;
 688         u32 previous_value;
 689         acpi_status status;
 690         u32 i;
 691
 692         /*
 693          * Entries (subpackages) in the _PSS Package must be sorted by power
 694          * dissipation, in descending order. If it appears that the list is
 695          * incorrectly sorted, sort it. We sort by cpu_frequency, since this
 696          * should be proportional to the power.
 697          */
 698         status = acpi_ns_check_sorted_list(info, return_object, 0, 6, 0,
 699                                            ACPI_SORT_DESCENDING,
 700                                            "CpuFrequency");
 701         if (ACPI_FAILURE(status)) {
 702                 return (status);
 703         }
 704
 705         /*
 706          * We now know the list is correctly sorted by CPU frequency. Check if
 707          * the power dissipation values are proportional.
 708          */
 709         previous_value = ACPI_UINT32_MAX;
 710         outer_elements = return_object->package.elements;
 711         outer_element_count = return_object->package.count;
 712
 713         for (i = 0; i < outer_element_count; i++) {
 714                 elements = (*outer_elements)->package.elements;
 715                 obj_desc = elements[1]; /* Index1 = power_dissipation */
 716
 717                 if ((u32)obj_desc->integer.value > previous_value) {
 718                         ACPI_WARN_PREDEFINED((AE_INFO,
 719                                               info->full_pathname,
 720                                               info->node_flags,
 721                                               "SubPackage[%u,%u] - suspicious power dissipation values",
 722                                               i - 1, i));
 723                 }
 724
 725                 previous_value = (u32) obj_desc->integer.value;
 726                 outer_elements++;
 727         }
 728
 729         return (AE_OK);
 730 }
 731
 732 /******************************************************************************
 733  *
 734  * FUNCTION:    acpi_ns_repair_TSS
 735  *
 736  * PARAMETERS:  info                - Method execution information block
 737  *              return_object_ptr   - Pointer to the object returned from the
 738  *                                    evaluation of a method or object
 739  *
 740  * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 741  *
 742  * DESCRIPTION: Repair for the _TSS object. If necessary, sort the object list
 743  *              descending by the power dissipation values.
 744  *
 745  *****************************************************************************/
 746
 747 static acpi_status
 748 acpi_ns_repair_TSS(struct acpi_evaluate_info *info,
 749                    union acpi_operand_object **return_object_ptr)
 750 {
 751         union acpi_operand_object *return_object = *return_object_ptr;
 752         acpi_status status;
 753         struct acpi_namespace_node *node;
 754
 755         /*
 756          * We can only sort the _TSS return package if there is no _PSS in the
 757          * same scope. This is because if _PSS is present, the ACPI specification
 758          * dictates that the _TSS Power Dissipation field is to be ignored, and
 759          * therefore some BIOSs leave garbage values in the _TSS Power field(s).
 760          * In this case, it is best to just return the _TSS package as-is.
 761          * (May, 2011)
 762          */
 763         status = acpi_ns_get_node(info->node, "^_PSS",
 764                                   ACPI_NS_NO_UPSEARCH, &node);
 765         if (ACPI_SUCCESS(status)) {
 766                 return (AE_OK);
 767         }
 768
 769         status = acpi_ns_check_sorted_list(info, return_object, 0, 5, 1,
 770                                            ACPI_SORT_DESCENDING,
 771                                            "PowerDissipation");
 772
 773         return (status);
 774 }
 775
 776 /******************************************************************************
 777  *
 778  * FUNCTION:    acpi_ns_check_sorted_list
 779  *
 780  * PARAMETERS:  info                - Method execution information block
 781  *              return_object       - Pointer to the top-level returned object
 782  *              start_index         - Index of the first subpackage
 783  *              expected_count      - Minimum length of each subpackage
 784  *              sort_index          - Subpackage entry to sort on
 785  *              sort_direction      - Ascending or descending
 786  *              sort_key_name       - Name of the sort_index field
 787  *
 788  * RETURN:      Status. AE_OK if the list is valid and is sorted correctly or
 789  *              has been repaired by sorting the list.
 790  *
 791  * DESCRIPTION: Check if the package list is valid and sorted correctly by the
 792  *              sort_index. If not, then sort the list.
 793  *
 794  *****************************************************************************/
 795
 796 static acpi_status
 797 acpi_ns_check_sorted_list(struct acpi_evaluate_info *info,
 798                           union acpi_operand_object *return_object,
 799                           u32 start_index,
 800                           u32 expected_count,
 801                           u32 sort_index,
 802                           u8 sort_direction, char *sort_key_name)
 803 {
 804         u32 outer_element_count;
 805         union acpi_operand_object **outer_elements;
 806         union acpi_operand_object **elements;
 807         union acpi_operand_object *obj_desc;
 808         u32 i;
 809         u32 previous_value;
 810
 811         ACPI_FUNCTION_NAME(ns_check_sorted_list);
 812
 813         /* The top-level object must be a package */
 814
 815         if (return_object->common.type != ACPI_TYPE_PACKAGE) {
 816                 return (AE_AML_OPERAND_TYPE);
 817         }
 818
 819         /*
 820          * NOTE: assumes list of subpackages contains no NULL elements.
 821          * Any NULL elements should have been removed by earlier call
 822          * to acpi_ns_remove_null_elements.
 823          */
 824         outer_element_count = return_object->package.count;
 825         if (!outer_element_count || start_index >= outer_element_count) {
 826                 return (AE_AML_PACKAGE_LIMIT);
 827         }
 828
 829         outer_elements = &return_object->package.elements[start_index];
 830         outer_element_count -= start_index;
 831
 832         previous_value = 0;
 833         if (sort_direction == ACPI_SORT_DESCENDING) {
 834                 previous_value = ACPI_UINT32_MAX;
 835         }
 836
 837         /* Examine each subpackage */
 838
 839         for (i = 0; i < outer_element_count; i++) {
 840
 841                 /* Each element of the top-level package must also be a package */
 842
 843                 if ((*outer_elements)->common.type != ACPI_TYPE_PACKAGE) {
 844                         return (AE_AML_OPERAND_TYPE);
 845                 }
 846
 847                 /* Each subpackage must have the minimum length */
 848
 849                 if ((*outer_elements)->package.count < expected_count) {
 850                         return (AE_AML_PACKAGE_LIMIT);
 851                 }
 852
 853                 elements = (*outer_elements)->package.elements;
 854                 obj_desc = elements[sort_index];
 855
 856                 if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
 857                         return (AE_AML_OPERAND_TYPE);
 858                 }
 859
 860                 /*
 861                  * The list must be sorted in the specified order. If we detect a
 862                  * discrepancy, sort the entire list.
 863                  */
 864                 if (((sort_direction == ACPI_SORT_ASCENDING) &&
 865                      (obj_desc->integer.value < previous_value)) ||
 866                     ((sort_direction == ACPI_SORT_DESCENDING) &&
 867                      (obj_desc->integer.value > previous_value))) {
 868                         acpi_ns_sort_list(&return_object->package.
 869                                           elements[start_index],
 870                                           outer_element_count, sort_index,
 871                                           sort_direction);
 872
 873                         info->return_flags |= ACPI_OBJECT_REPAIRED;
 874
 875                         ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 876                                           "%s: Repaired unsorted list - now sorted by %s\n",
 877                                           info->full_pathname, sort_key_name));
 878                         return (AE_OK);
 879                 }
 880
 881                 previous_value = (u32) obj_desc->integer.value;
 882                 outer_elements++;
 883         }
 884
 885         return (AE_OK);
 886 }
 887
 888 /******************************************************************************
 889  *
 890  * FUNCTION:    acpi_ns_sort_list
 891  *
 892  * PARAMETERS:  elements            - Package object element list
 893  *              count               - Element count for above
 894  *              index               - Sort by which package element
 895  *              sort_direction      - Ascending or Descending sort
 896  *
 897  * RETURN:      None
 898  *
 899  * DESCRIPTION: Sort the objects that are in a package element list.
 900  *
 901  * NOTE: Assumes that all NULL elements have been removed from the package,
 902  *       and that all elements have been verified to be of type Integer.
 903  *
 904  *****************************************************************************/
 905
 906 static void
 907 acpi_ns_sort_list(union acpi_operand_object **elements,
 908                   u32 count, u32 index, u8 sort_direction)
 909 {
 910         union acpi_operand_object *obj_desc1;
 911         union acpi_operand_object *obj_desc2;
 912         union acpi_operand_object *temp_obj;
 913         u32 i;
 914         u32 j;
 915
 916         /* Simple bubble sort */
 917
 918         for (i = 1; i < count; i++) {
 919                 for (j = (count - 1); j >= i; j--) {
 920                         obj_desc1 = elements[j - 1]->package.elements[index];
 921                         obj_desc2 = elements[j]->package.elements[index];
 922
 923                         if (((sort_direction == ACPI_SORT_ASCENDING) &&
 924                              (obj_desc1->integer.value >
 925                               obj_desc2->integer.value))
 926                             || ((sort_direction == ACPI_SORT_DESCENDING)
 927                                 && (obj_desc1->integer.value <
 928                                     obj_desc2->integer.value))) {
 929                                 temp_obj = elements[j - 1];
 930                                 elements[j - 1] = elements[j];
 931                                 elements[j] = temp_obj;
 932                         }
 933                 }
 934         }
 935 }
 936
 937 /******************************************************************************
 938  *
 939  * FUNCTION:    acpi_ns_remove_element
 940  *
 941  * PARAMETERS:  obj_desc            - Package object element list
 942  *              index               - Index of element to remove
 943  *
 944  * RETURN:      None
 945  *
 946  * DESCRIPTION: Remove the requested element of a package and delete it.
 947  *
 948  *****************************************************************************/
 949
 950 static void
 951 acpi_ns_remove_element(union acpi_operand_object *obj_desc, u32 index)
 952 {
 953         union acpi_operand_object **source;
 954         union acpi_operand_object **dest;
 955         u32 count;
 956         u32 new_count;
 957         u32 i;
 958
 959         ACPI_FUNCTION_NAME(ns_remove_element);
 960
 961         count = obj_desc->package.count;
 962         new_count = count - 1;
 963
 964         source = obj_desc->package.elements;
 965         dest = source;
 966
 967         /* Examine all elements of the package object, remove matched index */
 968
 969         for (i = 0; i < count; i++) {
 970                 if (i == index) {
 971                         acpi_ut_remove_reference(*source);      /* Remove one ref for being in pkg */
 972                         acpi_ut_remove_reference(*source);
 973                 } else {
 974                         *dest = *source;
 975                         dest++;
 976                 }
 977
 978                 source++;
 979         }
 980
 981         /* NULL terminate list and update the package count */
 982
 983         *dest = NULL;
 984         obj_desc->package.count = new_count;
 985 }