release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/acpi/acpica/tbinstal.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbinstal - ACPI table installation and removal
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, 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 "acnamesp.h"
  47 #include "actables.h"
  48
  49 #define _COMPONENT          ACPI_TABLES
  50 ACPI_MODULE_NAME("tbinstal")
  51
  52 /******************************************************************************
  53  *
  54  * FUNCTION:    acpi_tb_verify_table
  55  *
  56  * PARAMETERS:  table_desc          - table
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: this function is called to verify and map table
  61  *
  62  *****************************************************************************/
  63 acpi_status acpi_tb_verify_table(struct acpi_table_desc *table_desc)
  64 {
  65         acpi_status status = AE_OK;
  66
  67         ACPI_FUNCTION_TRACE(tb_verify_table);
  68
  69         /* Map the table if necessary */
  70
  71         if (!table_desc->pointer) {
  72                 if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) ==
  73                     ACPI_TABLE_ORIGIN_MAPPED) {
  74                         table_desc->pointer =
  75                             acpi_os_map_memory(table_desc->address,
  76                                                table_desc->length);
  77                 }
  78                 if (!table_desc->pointer) {
  79                         return_ACPI_STATUS(AE_NO_MEMORY);
  80                 }
  81         }
  82
  83         /* FACS is the odd table, has no standard ACPI header and no checksum */
  84
  85         if (!ACPI_COMPARE_NAME(&table_desc->signature, ACPI_SIG_FACS)) {
  86
  87                 /* Always calculate checksum, ignore bad checksum if requested */
  88
  89                 status =
  90                     acpi_tb_verify_checksum(table_desc->pointer,
  91                                             table_desc->length);
  92         }
  93
  94         return_ACPI_STATUS(status);
  95 }
  96
  97 /*******************************************************************************
  98  *
  99  * FUNCTION:    acpi_tb_add_table
 100  *
 101  * PARAMETERS:  table_desc          - Table descriptor
 102  *              table_index         - Where the table index is returned
 103  *
 104  * RETURN:      Status
 105  *
 106  * DESCRIPTION: This function is called to add an ACPI table. It is used to
 107  *              dynamically load tables via the Load and load_table AML
 108  *              operators.
 109  *
 110  ******************************************************************************/
 111
 112 acpi_status
 113 acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
 114 {
 115         u32 i;
 116         acpi_status status = AE_OK;
 117         struct acpi_table_header *override_table = NULL;
 118
 119         ACPI_FUNCTION_TRACE(tb_add_table);
 120
 121         if (!table_desc->pointer) {
 122                 status = acpi_tb_verify_table(table_desc);
 123                 if (ACPI_FAILURE(status) || !table_desc->pointer) {
 124                         return_ACPI_STATUS(status);
 125                 }
 126         }
 127
 128         /*
 129          * Originally, we checked the table signature for "SSDT" or "PSDT" here.
 130          * Next, we added support for OEMx tables, signature "OEM".
 131          * Valid tables were encountered with a null signature, so we've just
 132          * given up on validating the signature, since it seems to be a waste
 133          * of code. The original code was removed (05/2008).
 134          */
 135
 136         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 137
 138         /* Check if table is already registered */
 139
 140         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 141                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
 142                         status =
 143                             acpi_tb_verify_table(&acpi_gbl_root_table_list.
 144                                                  tables[i]);
 145                         if (ACPI_FAILURE(status)
 146                             || !acpi_gbl_root_table_list.tables[i].pointer) {
 147                                 continue;
 148                         }
 149                 }
 150
 151                 /*
 152                  * Check for a table match on the entire table length,
 153                  * not just the header.
 154                  */
 155                 if (table_desc->length !=
 156                     acpi_gbl_root_table_list.tables[i].length) {
 157                         continue;
 158                 }
 159
 160                 if (ACPI_MEMCMP(table_desc->pointer,
 161                                 acpi_gbl_root_table_list.tables[i].pointer,
 162                                 acpi_gbl_root_table_list.tables[i].length)) {
 163                         continue;
 164                 }
 165
 166                 /*
 167                  * Note: the current mechanism does not unregister a table if it is
 168                  * dynamically unloaded. The related namespace entries are deleted,
 169                  * but the table remains in the root table list.
 170                  *
 171                  * The assumption here is that the number of different tables that
 172                  * will be loaded is actually small, and there is minimal overhead
 173                  * in just keeping the table in case it is needed again.
 174                  *
 175                  * If this assumption changes in the future (perhaps on large
 176                  * machines with many table load/unload operations), tables will
 177                  * need to be unregistered when they are unloaded, and slots in the
 178                  * root table list should be reused when empty.
 179                  */
 180
 181                 /*
 182                  * Table is already registered.
 183                  * We can delete the table that was passed as a parameter.
 184                  */
 185                 acpi_tb_delete_table(table_desc);
 186                 *table_index = i;
 187
 188                 if (acpi_gbl_root_table_list.tables[i].
 189                     flags & ACPI_TABLE_IS_LOADED) {
 190
 191                         /* Table is still loaded, this is an error */
 192
 193                         status = AE_ALREADY_EXISTS;
 194                         goto release;
 195                 } else {
 196                         /* Table was unloaded, allow it to be reloaded */
 197
 198                         table_desc->pointer =
 199                             acpi_gbl_root_table_list.tables[i].pointer;
 200                         table_desc->address =
 201                             acpi_gbl_root_table_list.tables[i].address;
 202                         status = AE_OK;
 203                         goto print_header;
 204                 }
 205         }
 206
 207         /*
 208          * ACPI Table Override:
 209          * Allow the host to override dynamically loaded tables.
 210          */
 211         status = acpi_os_table_override(table_desc->pointer, &override_table);
 212         if (ACPI_SUCCESS(status) && override_table) {
 213                 ACPI_INFO((AE_INFO,
 214                            "%4.4s @ 0x%p Table override, replaced with:",
 215                            table_desc->pointer->signature,
 216                            ACPI_CAST_PTR(void, table_desc->address)));
 217
 218                 /* We can delete the table that was passed as a parameter */
 219
 220                 acpi_tb_delete_table(table_desc);
 221
 222                 /* Setup descriptor for the new table */
 223
 224                 table_desc->address = ACPI_PTR_TO_PHYSADDR(override_table);
 225                 table_desc->pointer = override_table;
 226                 table_desc->length = override_table->length;
 227                 table_desc->flags = ACPI_TABLE_ORIGIN_OVERRIDE;
 228         }
 229
 230         /* Add the table to the global root table list */
 231
 232         status = acpi_tb_store_table(table_desc->address, table_desc->pointer,
 233                                      table_desc->length, table_desc->flags,
 234                                      table_index);
 235         if (ACPI_FAILURE(status)) {
 236                 goto release;
 237         }
 238
 239       print_header:
 240         acpi_tb_print_table_header(table_desc->address, table_desc->pointer);
 241
 242       release:
 243         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 244         return_ACPI_STATUS(status);
 245 }
 246
 247 /*******************************************************************************
 248  *
 249  * FUNCTION:    acpi_tb_resize_root_table_list
 250  *
 251  * PARAMETERS:  None
 252  *
 253  * RETURN:      Status
 254  *
 255  * DESCRIPTION: Expand the size of global table array
 256  *
 257  ******************************************************************************/
 258
 259 acpi_status acpi_tb_resize_root_table_list(void)
 260 {
 261         struct acpi_table_desc *tables;
 262
 263         ACPI_FUNCTION_TRACE(tb_resize_root_table_list);
 264
 265         /* allow_resize flag is a parameter to acpi_initialize_tables */
 266
 267         if (!(acpi_gbl_root_table_list.flags & ACPI_ROOT_ALLOW_RESIZE)) {
 268                 ACPI_ERROR((AE_INFO,
 269                             "Resize of Root Table Array is not allowed"));
 270                 return_ACPI_STATUS(AE_SUPPORT);
 271         }
 272
 273         /* Increase the Table Array size */
 274
 275         tables = ACPI_ALLOCATE_ZEROED(((acpi_size) acpi_gbl_root_table_list.
 276                                        max_table_count +
 277                                        ACPI_ROOT_TABLE_SIZE_INCREMENT) *
 278                                       sizeof(struct acpi_table_desc));
 279         if (!tables) {
 280                 ACPI_ERROR((AE_INFO,
 281                             "Could not allocate new root table array"));
 282                 return_ACPI_STATUS(AE_NO_MEMORY);
 283         }
 284
 285         /* Copy and free the previous table array */
 286
 287         if (acpi_gbl_root_table_list.tables) {
 288                 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables,
 289                             (acpi_size) acpi_gbl_root_table_list.
 290                             max_table_count * sizeof(struct acpi_table_desc));
 291
 292                 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 293                         ACPI_FREE(acpi_gbl_root_table_list.tables);
 294                 }
 295         }
 296
 297         acpi_gbl_root_table_list.tables = tables;
 298         acpi_gbl_root_table_list.max_table_count +=
 299             ACPI_ROOT_TABLE_SIZE_INCREMENT;
 300         acpi_gbl_root_table_list.flags |= (u8)ACPI_ROOT_ORIGIN_ALLOCATED;
 301
 302         return_ACPI_STATUS(AE_OK);
 303 }
 304
 305 /*******************************************************************************
 306  *
 307  * FUNCTION:    acpi_tb_store_table
 308  *
 309  * PARAMETERS:  Address             - Table address
 310  *              Table               - Table header
 311  *              Length              - Table length
 312  *              Flags               - flags
 313  *
 314  * RETURN:      Status and table index.
 315  *
 316  * DESCRIPTION: Add an ACPI table to the global table list
 317  *
 318  ******************************************************************************/
 319
 320 acpi_status
 321 acpi_tb_store_table(acpi_physical_address address,
 322                     struct acpi_table_header *table,
 323                     u32 length, u8 flags, u32 *table_index)
 324 {
 325         acpi_status status;
 326         struct acpi_table_desc *new_table;
 327
 328         /* Ensure that there is room for the table in the Root Table List */
 329
 330         if (acpi_gbl_root_table_list.current_table_count >=
 331             acpi_gbl_root_table_list.max_table_count) {
 332                 status = acpi_tb_resize_root_table_list();
 333                 if (ACPI_FAILURE(status)) {
 334                         return (status);
 335                 }
 336         }
 337
 338         new_table =
 339             &acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.
 340                                              current_table_count];
 341
 342         /* Initialize added table */
 343
 344         new_table->address = address;
 345         new_table->pointer = table;
 346         new_table->length = length;
 347         new_table->owner_id = 0;
 348         new_table->flags = flags;
 349
 350         ACPI_MOVE_32_TO_32(&new_table->signature, table->signature);
 351
 352         *table_index = acpi_gbl_root_table_list.current_table_count;
 353         acpi_gbl_root_table_list.current_table_count++;
 354         return (AE_OK);
 355 }
 356
 357 /*******************************************************************************
 358  *
 359  * FUNCTION:    acpi_tb_delete_table
 360  *
 361  * PARAMETERS:  table_index         - Table index
 362  *
 363  * RETURN:      None
 364  *
 365  * DESCRIPTION: Delete one internal ACPI table
 366  *
 367  ******************************************************************************/
 368
 369 void acpi_tb_delete_table(struct acpi_table_desc *table_desc)
 370 {
 371         /* Table must be mapped or allocated */
 372         if (!table_desc->pointer) {
 373                 return;
 374         }
 375         switch (table_desc->flags & ACPI_TABLE_ORIGIN_MASK) {
 376         case ACPI_TABLE_ORIGIN_MAPPED:
 377                 acpi_os_unmap_memory(table_desc->pointer, table_desc->length);
 378                 break;
 379         case ACPI_TABLE_ORIGIN_ALLOCATED:
 380                 ACPI_FREE(table_desc->pointer);
 381                 break;
 382         default:;
 383         }
 384
 385         table_desc->pointer = NULL;
 386 }
 387
 388 /*******************************************************************************
 389  *
 390  * FUNCTION:    acpi_tb_terminate
 391  *
 392  * PARAMETERS:  None
 393  *
 394  * RETURN:      None
 395  *
 396  * DESCRIPTION: Delete all internal ACPI tables
 397  *
 398  ******************************************************************************/
 399
 400 void acpi_tb_terminate(void)
 401 {
 402         u32 i;
 403
 404         ACPI_FUNCTION_TRACE(tb_terminate);
 405
 406         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 407
 408         /* Delete the individual tables */
 409
 410         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 411                 acpi_tb_delete_table(&acpi_gbl_root_table_list.tables[i]);
 412         }
 413
 414         /*
 415          * Delete the root table array if allocated locally. Array cannot be
 416          * mapped, so we don't need to check for that flag.
 417          */
 418         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 419                 ACPI_FREE(acpi_gbl_root_table_list.tables);
 420         }
 421
 422         acpi_gbl_root_table_list.tables = NULL;
 423         acpi_gbl_root_table_list.flags = 0;
 424         acpi_gbl_root_table_list.current_table_count = 0;
 425
 426         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ACPI Tables freed\n"));
 427         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 428 }
 429
 430 /*******************************************************************************
 431  *
 432  * FUNCTION:    acpi_tb_delete_namespace_by_owner
 433  *
 434  * PARAMETERS:  table_index         - Table index
 435  *
 436  * RETURN:      Status
 437  *
 438  * DESCRIPTION: Delete all namespace objects created when this table was loaded.
 439  *
 440  ******************************************************************************/
 441
 442 acpi_status acpi_tb_delete_namespace_by_owner(u32 table_index)
 443 {
 444         acpi_owner_id owner_id;
 445         acpi_status status;
 446
 447         ACPI_FUNCTION_TRACE(tb_delete_namespace_by_owner);
 448
 449         status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 450         if (ACPI_FAILURE(status)) {
 451                 return_ACPI_STATUS(status);
 452         }
 453
 454         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
 455
 456                 /* The table index does not exist */
 457
 458                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 459                 return_ACPI_STATUS(AE_NOT_EXIST);
 460         }
 461
 462         /* Get the owner ID for this table, used to delete namespace nodes */
 463
 464         owner_id = acpi_gbl_root_table_list.tables[table_index].owner_id;
 465         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 466
 467         /*
 468          * Need to acquire the namespace writer lock to prevent interference
 469          * with any concurrent namespace walks. The interpreter must be
 470          * released during the deletion since the acquisition of the deletion
 471          * lock may block, and also since the execution of a namespace walk
 472          * must be allowed to use the interpreter.
 473          */
 474         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 475         status = acpi_ut_acquire_write_lock(&acpi_gbl_namespace_rw_lock);
 476
 477         acpi_ns_delete_namespace_by_owner(owner_id);
 478         if (ACPI_FAILURE(status)) {
 479                 return_ACPI_STATUS(status);
 480         }
 481
 482         acpi_ut_release_write_lock(&acpi_gbl_namespace_rw_lock);
 483
 484         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 485         return_ACPI_STATUS(status);
 486 }
 487
 488 /*******************************************************************************
 489  *
 490  * FUNCTION:    acpi_tb_allocate_owner_id
 491  *
 492  * PARAMETERS:  table_index         - Table index
 493  *
 494  * RETURN:      Status
 495  *
 496  * DESCRIPTION: Allocates owner_id in table_desc
 497  *
 498  ******************************************************************************/
 499
 500 acpi_status acpi_tb_allocate_owner_id(u32 table_index)
 501 {
 502         acpi_status status = AE_BAD_PARAMETER;
 503
 504         ACPI_FUNCTION_TRACE(tb_allocate_owner_id);
 505
 506         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 507         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 508                 status = acpi_ut_allocate_owner_id
 509                     (&(acpi_gbl_root_table_list.tables[table_index].owner_id));
 510         }
 511
 512         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 513         return_ACPI_STATUS(status);
 514 }
 515
 516 /*******************************************************************************
 517  *
 518  * FUNCTION:    acpi_tb_release_owner_id
 519  *
 520  * PARAMETERS:  table_index         - Table index
 521  *
 522  * RETURN:      Status
 523  *
 524  * DESCRIPTION: Releases owner_id in table_desc
 525  *
 526  ******************************************************************************/
 527
 528 acpi_status acpi_tb_release_owner_id(u32 table_index)
 529 {
 530         acpi_status status = AE_BAD_PARAMETER;
 531
 532         ACPI_FUNCTION_TRACE(tb_release_owner_id);
 533
 534         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 535         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 536                 acpi_ut_release_owner_id(&
 537                                          (acpi_gbl_root_table_list.
 538                                           tables[table_index].owner_id));
 539                 status = AE_OK;
 540         }
 541
 542         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 543         return_ACPI_STATUS(status);
 544 }
 545
 546 /*******************************************************************************
 547  *
 548  * FUNCTION:    acpi_tb_get_owner_id
 549  *
 550  * PARAMETERS:  table_index         - Table index
 551  *              owner_id            - Where the table owner_id is returned
 552  *
 553  * RETURN:      Status
 554  *
 555  * DESCRIPTION: returns owner_id for the ACPI table
 556  *
 557  ******************************************************************************/
 558
 559 acpi_status acpi_tb_get_owner_id(u32 table_index, acpi_owner_id *owner_id)
 560 {
 561         acpi_status status = AE_BAD_PARAMETER;
 562
 563         ACPI_FUNCTION_TRACE(tb_get_owner_id);
 564
 565         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 566         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 567                 *owner_id =
 568                     acpi_gbl_root_table_list.tables[table_index].owner_id;
 569                 status = AE_OK;
 570         }
 571
 572         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 573         return_ACPI_STATUS(status);
 574 }
 575
 576 /*******************************************************************************
 577  *
 578  * FUNCTION:    acpi_tb_is_table_loaded
 579  *
 580  * PARAMETERS:  table_index         - Table index
 581  *
 582  * RETURN:      Table Loaded Flag
 583  *
 584  ******************************************************************************/
 585
 586 u8 acpi_tb_is_table_loaded(u32 table_index)
 587 {
 588         u8 is_loaded = FALSE;
 589
 590         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 591         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 592                 is_loaded = (u8)
 593                     (acpi_gbl_root_table_list.tables[table_index].flags &
 594                      ACPI_TABLE_IS_LOADED);
 595         }
 596
 597         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 598         return (is_loaded);
 599 }
 600
 601 /*******************************************************************************
 602  *
 603  * FUNCTION:    acpi_tb_set_table_loaded_flag
 604  *
 605  * PARAMETERS:  table_index         - Table index
 606  *              is_loaded           - TRUE if table is loaded, FALSE otherwise
 607  *
 608  * RETURN:      None
 609  *
 610  * DESCRIPTION: Sets the table loaded flag to either TRUE or FALSE.
 611  *
 612  ******************************************************************************/
 613
 614 void acpi_tb_set_table_loaded_flag(u32 table_index, u8 is_loaded)
 615 {
 616
 617         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 618         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 619                 if (is_loaded) {
 620                         acpi_gbl_root_table_list.tables[table_index].flags |=
 621                             ACPI_TABLE_IS_LOADED;
 622                 } else {
 623                         acpi_gbl_root_table_list.tables[table_index].flags &=
 624                             ~ACPI_TABLE_IS_LOADED;
 625                 }
 626         }
 627
 628         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 629 }