git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/tables/tbinstal.c

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