git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/acpica/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 "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 the ACPI table
 107  *
 108  ******************************************************************************/
 109
 110 acpi_status
 111 acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
 112 {
 113         u32 i;
 114         acpi_status status = AE_OK;
 115
 116         ACPI_FUNCTION_TRACE(tb_add_table);
 117
 118         if (!table_desc->pointer) {
 119                 status = acpi_tb_verify_table(table_desc);
 120                 if (ACPI_FAILURE(status) || !table_desc->pointer) {
 121                         return_ACPI_STATUS(status);
 122                 }
 123         }
 124
 125         /*
 126          * Originally, we checked the table signature for "SSDT" or "PSDT" here.
 127          * Next, we added support for OEMx tables, signature "OEM".
 128          * Valid tables were encountered with a null signature, so we've just
 129          * given up on validating the signature, since it seems to be a waste
 130          * of code. The original code was removed (05/2008).
 131          */
 132
 133         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 134
 135         /* Check if table is already registered */
 136
 137         for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
 138                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
 139                         status =
 140                             acpi_tb_verify_table(&acpi_gbl_root_table_list.
 141                                                  tables[i]);
 142                         if (ACPI_FAILURE(status)
 143                             || !acpi_gbl_root_table_list.tables[i].pointer) {
 144                                 continue;
 145                         }
 146                 }
 147
 148                 /*
 149                  * Check for a table match on the entire table length,
 150                  * not just the header.
 151                  */
 152                 if (table_desc->length !=
 153                     acpi_gbl_root_table_list.tables[i].length) {
 154                         continue;
 155                 }
 156
 157                 if (ACPI_MEMCMP(table_desc->pointer,
 158                                 acpi_gbl_root_table_list.tables[i].pointer,
 159                                 acpi_gbl_root_table_list.tables[i].length)) {
 160                         continue;
 161                 }
 162
 163                 /*
 164                  * Note: the current mechanism does not unregister a table if it is
 165                  * dynamically unloaded. The related namespace entries are deleted,
 166                  * but the table remains in the root table list.
 167                  *
 168                  * The assumption here is that the number of different tables that
 169                  * will be loaded is actually small, and there is minimal overhead
 170                  * in just keeping the table in case it is needed again.
 171                  *
 172                  * If this assumption changes in the future (perhaps on large
 173                  * machines with many table load/unload operations), tables will
 174                  * need to be unregistered when they are unloaded, and slots in the
 175                  * root table list should be reused when empty.
 176                  */
 177
 178                 /*
 179                  * Table is already registered.
 180                  * We can delete the table that was passed as a parameter.
 181                  */
 182                 acpi_tb_delete_table(table_desc);
 183                 *table_index = i;
 184
 185                 if (acpi_gbl_root_table_list.tables[i].
 186                     flags & ACPI_TABLE_IS_LOADED) {
 187
 188                         /* Table is still loaded, this is an error */
 189
 190                         status = AE_ALREADY_EXISTS;
 191                         goto release;
 192                 } else {
 193                         /* Table was unloaded, allow it to be reloaded */
 194
 195                         table_desc->pointer =
 196                             acpi_gbl_root_table_list.tables[i].pointer;
 197                         table_desc->address =
 198                             acpi_gbl_root_table_list.tables[i].address;
 199                         status = AE_OK;
 200                         goto print_header;
 201                 }
 202         }
 203
 204         /* Add the table to the global root table list */
 205
 206         status = acpi_tb_store_table(table_desc->address, table_desc->pointer,
 207                                      table_desc->length, table_desc->flags,
 208                                      table_index);
 209         if (ACPI_FAILURE(status)) {
 210                 goto release;
 211         }
 212
 213       print_header:
 214         acpi_tb_print_table_header(table_desc->address, table_desc->pointer);
 215
 216       release:
 217         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 218         return_ACPI_STATUS(status);
 219 }
 220
 221 /*******************************************************************************
 222  *
 223  * FUNCTION:    acpi_tb_resize_root_table_list
 224  *
 225  * PARAMETERS:  None
 226  *
 227  * RETURN:      Status
 228  *
 229  * DESCRIPTION: Expand the size of global table array
 230  *
 231  ******************************************************************************/
 232
 233 acpi_status acpi_tb_resize_root_table_list(void)
 234 {
 235         struct acpi_table_desc *tables;
 236
 237         ACPI_FUNCTION_TRACE(tb_resize_root_table_list);
 238
 239         /* allow_resize flag is a parameter to acpi_initialize_tables */
 240
 241         if (!(acpi_gbl_root_table_list.flags & ACPI_ROOT_ALLOW_RESIZE)) {
 242                 ACPI_ERROR((AE_INFO,
 243                             "Resize of Root Table Array is not allowed"));
 244                 return_ACPI_STATUS(AE_SUPPORT);
 245         }
 246
 247         /* Increase the Table Array size */
 248
 249         tables = ACPI_ALLOCATE_ZEROED(((acpi_size) acpi_gbl_root_table_list.
 250                                        size + ACPI_ROOT_TABLE_SIZE_INCREMENT)
 251                                       * sizeof(struct acpi_table_desc));
 252         if (!tables) {
 253                 ACPI_ERROR((AE_INFO,
 254                             "Could not allocate new root table array"));
 255                 return_ACPI_STATUS(AE_NO_MEMORY);
 256         }
 257
 258         /* Copy and free the previous table array */
 259
 260         if (acpi_gbl_root_table_list.tables) {
 261                 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables,
 262                             (acpi_size) acpi_gbl_root_table_list.size *
 263                             sizeof(struct acpi_table_desc));
 264
 265                 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 266                         ACPI_FREE(acpi_gbl_root_table_list.tables);
 267                 }
 268         }
 269
 270         acpi_gbl_root_table_list.tables = tables;
 271         acpi_gbl_root_table_list.size += ACPI_ROOT_TABLE_SIZE_INCREMENT;
 272         acpi_gbl_root_table_list.flags |= (u8) ACPI_ROOT_ORIGIN_ALLOCATED;
 273
 274         return_ACPI_STATUS(AE_OK);
 275 }
 276
 277 /*******************************************************************************
 278  *
 279  * FUNCTION:    acpi_tb_store_table
 280  *
 281  * PARAMETERS:  Address             - Table address
 282  *              Table               - Table header
 283  *              Length              - Table length
 284  *              Flags               - flags
 285  *
 286  * RETURN:      Status and table index.
 287  *
 288  * DESCRIPTION: Add an ACPI table to the global table list
 289  *
 290  ******************************************************************************/
 291
 292 acpi_status
 293 acpi_tb_store_table(acpi_physical_address address,
 294                     struct acpi_table_header *table,
 295                     u32 length, u8 flags, u32 *table_index)
 296 {
 297         acpi_status status = AE_OK;
 298
 299         /* Ensure that there is room for the table in the Root Table List */
 300
 301         if (acpi_gbl_root_table_list.count >= acpi_gbl_root_table_list.size) {
 302                 status = acpi_tb_resize_root_table_list();
 303                 if (ACPI_FAILURE(status)) {
 304                         return (status);
 305                 }
 306         }
 307
 308         /* Initialize added table */
 309
 310         acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].
 311             address = address;
 312         acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].
 313             pointer = table;
 314         acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].length =
 315             length;
 316         acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].
 317             owner_id = 0;
 318         acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].flags =
 319             flags;
 320
 321         ACPI_MOVE_32_TO_32(&
 322                            (acpi_gbl_root_table_list.
 323                             tables[acpi_gbl_root_table_list.count].signature),
 324                            table->signature);
 325
 326         *table_index = acpi_gbl_root_table_list.count;
 327         acpi_gbl_root_table_list.count++;
 328         return (status);
 329 }
 330
 331 /*******************************************************************************
 332  *
 333  * FUNCTION:    acpi_tb_delete_table
 334  *
 335  * PARAMETERS:  table_index         - Table index
 336  *
 337  * RETURN:      None
 338  *
 339  * DESCRIPTION: Delete one internal ACPI table
 340  *
 341  ******************************************************************************/
 342
 343 void acpi_tb_delete_table(struct acpi_table_desc *table_desc)
 344 {
 345         /* Table must be mapped or allocated */
 346         if (!table_desc->pointer) {
 347                 return;
 348         }
 349         switch (table_desc->flags & ACPI_TABLE_ORIGIN_MASK) {
 350         case ACPI_TABLE_ORIGIN_MAPPED:
 351                 acpi_os_unmap_memory(table_desc->pointer, table_desc->length);
 352                 break;
 353         case ACPI_TABLE_ORIGIN_ALLOCATED:
 354                 ACPI_FREE(table_desc->pointer);
 355                 break;
 356         default:;
 357         }
 358
 359         table_desc->pointer = NULL;
 360 }
 361
 362 /*******************************************************************************
 363  *
 364  * FUNCTION:    acpi_tb_terminate
 365  *
 366  * PARAMETERS:  None
 367  *
 368  * RETURN:      None
 369  *
 370  * DESCRIPTION: Delete all internal ACPI tables
 371  *
 372  ******************************************************************************/
 373
 374 void acpi_tb_terminate(void)
 375 {
 376         u32 i;
 377
 378         ACPI_FUNCTION_TRACE(tb_terminate);
 379
 380         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 381
 382         /* Delete the individual tables */
 383
 384         for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
 385                 acpi_tb_delete_table(&acpi_gbl_root_table_list.tables[i]);
 386         }
 387
 388         /*
 389          * Delete the root table array if allocated locally. Array cannot be
 390          * mapped, so we don't need to check for that flag.
 391          */
 392         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 393                 ACPI_FREE(acpi_gbl_root_table_list.tables);
 394         }
 395
 396         acpi_gbl_root_table_list.tables = NULL;
 397         acpi_gbl_root_table_list.flags = 0;
 398         acpi_gbl_root_table_list.count = 0;
 399
 400         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ACPI Tables freed\n"));
 401         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 402 }
 403
 404 /*******************************************************************************
 405  *
 406  * FUNCTION:    acpi_tb_delete_namespace_by_owner
 407  *
 408  * PARAMETERS:  table_index         - Table index
 409  *
 410  * RETURN:      None
 411  *
 412  * DESCRIPTION: Delete all namespace objects created when this table was loaded.
 413  *
 414  ******************************************************************************/
 415
 416 void acpi_tb_delete_namespace_by_owner(u32 table_index)
 417 {
 418         acpi_owner_id owner_id;
 419
 420         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 421         if (table_index < acpi_gbl_root_table_list.count) {
 422                 owner_id =
 423                     acpi_gbl_root_table_list.tables[table_index].owner_id;
 424         } else {
 425                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 426                 return;
 427         }
 428
 429         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 430         acpi_ns_delete_namespace_by_owner(owner_id);
 431 }
 432
 433 /*******************************************************************************
 434  *
 435  * FUNCTION:    acpi_tb_allocate_owner_id
 436  *
 437  * PARAMETERS:  table_index         - Table index
 438  *
 439  * RETURN:      Status
 440  *
 441  * DESCRIPTION: Allocates owner_id in table_desc
 442  *
 443  ******************************************************************************/
 444
 445 acpi_status acpi_tb_allocate_owner_id(u32 table_index)
 446 {
 447         acpi_status status = AE_BAD_PARAMETER;
 448
 449         ACPI_FUNCTION_TRACE(tb_allocate_owner_id);
 450
 451         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 452         if (table_index < acpi_gbl_root_table_list.count) {
 453                 status = acpi_ut_allocate_owner_id
 454                     (&(acpi_gbl_root_table_list.tables[table_index].owner_id));
 455         }
 456
 457         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 458         return_ACPI_STATUS(status);
 459 }
 460
 461 /*******************************************************************************
 462  *
 463  * FUNCTION:    acpi_tb_release_owner_id
 464  *
 465  * PARAMETERS:  table_index         - Table index
 466  *
 467  * RETURN:      Status
 468  *
 469  * DESCRIPTION: Releases owner_id in table_desc
 470  *
 471  ******************************************************************************/
 472
 473 acpi_status acpi_tb_release_owner_id(u32 table_index)
 474 {
 475         acpi_status status = AE_BAD_PARAMETER;
 476
 477         ACPI_FUNCTION_TRACE(tb_release_owner_id);
 478
 479         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 480         if (table_index < acpi_gbl_root_table_list.count) {
 481                 acpi_ut_release_owner_id(&
 482                                          (acpi_gbl_root_table_list.
 483                                           tables[table_index].owner_id));
 484                 status = AE_OK;
 485         }
 486
 487         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 488         return_ACPI_STATUS(status);
 489 }
 490
 491 /*******************************************************************************
 492  *
 493  * FUNCTION:    acpi_tb_get_owner_id
 494  *
 495  * PARAMETERS:  table_index         - Table index
 496  *              owner_id            - Where the table owner_id is returned
 497  *
 498  * RETURN:      Status
 499  *
 500  * DESCRIPTION: returns owner_id for the ACPI table
 501  *
 502  ******************************************************************************/
 503
 504 acpi_status acpi_tb_get_owner_id(u32 table_index, acpi_owner_id *owner_id)
 505 {
 506         acpi_status status = AE_BAD_PARAMETER;
 507
 508         ACPI_FUNCTION_TRACE(tb_get_owner_id);
 509
 510         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 511         if (table_index < acpi_gbl_root_table_list.count) {
 512                 *owner_id =
 513                     acpi_gbl_root_table_list.tables[table_index].owner_id;
 514                 status = AE_OK;
 515         }
 516
 517         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 518         return_ACPI_STATUS(status);
 519 }
 520
 521 /*******************************************************************************
 522  *
 523  * FUNCTION:    acpi_tb_is_table_loaded
 524  *
 525  * PARAMETERS:  table_index         - Table index
 526  *
 527  * RETURN:      Table Loaded Flag
 528  *
 529  ******************************************************************************/
 530
 531 u8 acpi_tb_is_table_loaded(u32 table_index)
 532 {
 533         u8 is_loaded = FALSE;
 534
 535         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 536         if (table_index < acpi_gbl_root_table_list.count) {
 537                 is_loaded = (u8)
 538                     (acpi_gbl_root_table_list.tables[table_index].
 539                      flags & ACPI_TABLE_IS_LOADED);
 540         }
 541
 542         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 543         return (is_loaded);
 544 }
 545
 546 /*******************************************************************************
 547  *
 548  * FUNCTION:    acpi_tb_set_table_loaded_flag
 549  *
 550  * PARAMETERS:  table_index         - Table index
 551  *              is_loaded           - TRUE if table is loaded, FALSE otherwise
 552  *
 553  * RETURN:      None
 554  *
 555  * DESCRIPTION: Sets the table loaded flag to either TRUE or FALSE.
 556  *
 557  ******************************************************************************/
 558
 559 void acpi_tb_set_table_loaded_flag(u32 table_index, u8 is_loaded)
 560 {
 561
 562         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 563         if (table_index < acpi_gbl_root_table_list.count) {
 564                 if (is_loaded) {
 565                         acpi_gbl_root_table_list.tables[table_index].flags |=
 566                             ACPI_TABLE_IS_LOADED;
 567                 } else {
 568                         acpi_gbl_root_table_list.tables[table_index].flags &=
 569                             ~ACPI_TABLE_IS_LOADED;
 570                 }
 571         }
 572
 573         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 574 }