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

   1 /******************************************************************************
   2  *
   3  * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
   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 "acinterp.h"
  47 #include "acnamesp.h"
  48 #include "actables.h"
  49 #include "acdispat.h"
  50 #include "acevents.h"
  51
  52 #define _COMPONENT          ACPI_EXECUTER
  53 ACPI_MODULE_NAME("exconfig")
  54
  55 /* Local prototypes */
  56 static acpi_status
  57 acpi_ex_add_table(u32 table_index,
  58                   struct acpi_namespace_node *parent_node,
  59                   union acpi_operand_object **ddb_handle);
  60
  61 static acpi_status
  62 acpi_ex_region_read(union acpi_operand_object *obj_desc,
  63                     u32 length, u8 *buffer);
  64
  65 /*******************************************************************************
  66  *
  67  * FUNCTION:    acpi_ex_add_table
  68  *
  69  * PARAMETERS:  Table               - Pointer to raw table
  70  *              parent_node         - Where to load the table (scope)
  71  *              ddb_handle          - Where to return the table handle.
  72  *
  73  * RETURN:      Status
  74  *
  75  * DESCRIPTION: Common function to Install and Load an ACPI table with a
  76  *              returned table handle.
  77  *
  78  ******************************************************************************/
  79
  80 static acpi_status
  81 acpi_ex_add_table(u32 table_index,
  82                   struct acpi_namespace_node *parent_node,
  83                   union acpi_operand_object **ddb_handle)
  84 {
  85         union acpi_operand_object *obj_desc;
  86         acpi_status status;
  87         acpi_owner_id owner_id;
  88
  89         ACPI_FUNCTION_TRACE(ex_add_table);
  90
  91         /* Create an object to be the table handle */
  92
  93         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
  94         if (!obj_desc) {
  95                 return_ACPI_STATUS(AE_NO_MEMORY);
  96         }
  97
  98         /* Init the table handle */
  99
 100         obj_desc->common.flags |= AOPOBJ_DATA_VALID;
 101         obj_desc->reference.class = ACPI_REFCLASS_TABLE;
 102         *ddb_handle = obj_desc;
 103
 104         /* Install the new table into the local data structures */
 105
 106         obj_desc->reference.value = table_index;
 107
 108         /* Add the table to the namespace */
 109
 110         status = acpi_ns_load_table(table_index, parent_node);
 111         if (ACPI_FAILURE(status)) {
 112                 acpi_ut_remove_reference(obj_desc);
 113                 *ddb_handle = NULL;
 114                 return_ACPI_STATUS(status);
 115         }
 116
 117         /* Execute any module-level code that was found in the table */
 118
 119         acpi_ex_exit_interpreter();
 120         acpi_ns_exec_module_code_list();
 121         acpi_ex_enter_interpreter();
 122
 123         /* Update GPEs for any new _Lxx/_Exx methods. Ignore errors */
 124
 125         status = acpi_tb_get_owner_id(table_index, &owner_id);
 126         if (ACPI_SUCCESS(status)) {
 127                 acpi_ev_update_gpes(owner_id);
 128         }
 129
 130         return_ACPI_STATUS(AE_OK);
 131 }
 132
 133 /*******************************************************************************
 134  *
 135  * FUNCTION:    acpi_ex_load_table_op
 136  *
 137  * PARAMETERS:  walk_state          - Current state with operands
 138  *              return_desc         - Where to store the return object
 139  *
 140  * RETURN:      Status
 141  *
 142  * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
 143  *
 144  ******************************************************************************/
 145
 146 acpi_status
 147 acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
 148                       union acpi_operand_object **return_desc)
 149 {
 150         acpi_status status;
 151         union acpi_operand_object **operand = &walk_state->operands[0];
 152         struct acpi_namespace_node *parent_node;
 153         struct acpi_namespace_node *start_node;
 154         struct acpi_namespace_node *parameter_node = NULL;
 155         union acpi_operand_object *ddb_handle;
 156         struct acpi_table_header *table;
 157         u32 table_index;
 158
 159         ACPI_FUNCTION_TRACE(ex_load_table_op);
 160
 161         /* Validate lengths for the signature_string, OEMIDString, OEMtable_iD */
 162
 163         if ((operand[0]->string.length > ACPI_NAME_SIZE) ||
 164             (operand[1]->string.length > ACPI_OEM_ID_SIZE) ||
 165             (operand[2]->string.length > ACPI_OEM_TABLE_ID_SIZE)) {
 166                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 167         }
 168
 169         /* Find the ACPI table in the RSDT/XSDT */
 170
 171         status = acpi_tb_find_table(operand[0]->string.pointer,
 172                                     operand[1]->string.pointer,
 173                                     operand[2]->string.pointer, &table_index);
 174         if (ACPI_FAILURE(status)) {
 175                 if (status != AE_NOT_FOUND) {
 176                         return_ACPI_STATUS(status);
 177                 }
 178
 179                 /* Table not found, return an Integer=0 and AE_OK */
 180
 181                 ddb_handle = acpi_ut_create_integer_object((u64) 0);
 182                 if (!ddb_handle) {
 183                         return_ACPI_STATUS(AE_NO_MEMORY);
 184                 }
 185
 186                 *return_desc = ddb_handle;
 187                 return_ACPI_STATUS(AE_OK);
 188         }
 189
 190         /* Default nodes */
 191
 192         start_node = walk_state->scope_info->scope.node;
 193         parent_node = acpi_gbl_root_node;
 194
 195         /* root_path (optional parameter) */
 196
 197         if (operand[3]->string.length > 0) {
 198                 /*
 199                  * Find the node referenced by the root_path_string. This is the
 200                  * location within the namespace where the table will be loaded.
 201                  */
 202                 status =
 203                     acpi_ns_get_node(start_node, operand[3]->string.pointer,
 204                                      ACPI_NS_SEARCH_PARENT, &parent_node);
 205                 if (ACPI_FAILURE(status)) {
 206                         return_ACPI_STATUS(status);
 207                 }
 208         }
 209
 210         /* parameter_path (optional parameter) */
 211
 212         if (operand[4]->string.length > 0) {
 213                 if ((operand[4]->string.pointer[0] != '\\') &&
 214                     (operand[4]->string.pointer[0] != '^')) {
 215                         /*
 216                          * Path is not absolute, so it will be relative to the node
 217                          * referenced by the root_path_string (or the NS root if omitted)
 218                          */
 219                         start_node = parent_node;
 220                 }
 221
 222                 /* Find the node referenced by the parameter_path_string */
 223
 224                 status =
 225                     acpi_ns_get_node(start_node, operand[4]->string.pointer,
 226                                      ACPI_NS_SEARCH_PARENT, &parameter_node);
 227                 if (ACPI_FAILURE(status)) {
 228                         return_ACPI_STATUS(status);
 229                 }
 230         }
 231
 232         /* Load the table into the namespace */
 233
 234         status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
 235         if (ACPI_FAILURE(status)) {
 236                 return_ACPI_STATUS(status);
 237         }
 238
 239         /* Parameter Data (optional) */
 240
 241         if (parameter_node) {
 242
 243                 /* Store the parameter data into the optional parameter object */
 244
 245                 status = acpi_ex_store(operand[5],
 246                                        ACPI_CAST_PTR(union acpi_operand_object,
 247                                                      parameter_node),
 248                                        walk_state);
 249                 if (ACPI_FAILURE(status)) {
 250                         (void)acpi_ex_unload_table(ddb_handle);
 251
 252                         acpi_ut_remove_reference(ddb_handle);
 253                         return_ACPI_STATUS(status);
 254                 }
 255         }
 256
 257         status = acpi_get_table_by_index(table_index, &table);
 258         if (ACPI_SUCCESS(status)) {
 259                 ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:"));
 260                 acpi_tb_print_table_header(0, table);
 261         }
 262
 263         /* Invoke table handler if present */
 264
 265         if (acpi_gbl_table_handler) {
 266                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 267                                              acpi_gbl_table_handler_context);
 268         }
 269
 270         *return_desc = ddb_handle;
 271         return_ACPI_STATUS(status);
 272 }
 273
 274 /*******************************************************************************
 275  *
 276  * FUNCTION:    acpi_ex_region_read
 277  *
 278  * PARAMETERS:  obj_desc        - Region descriptor
 279  *              Length          - Number of bytes to read
 280  *              Buffer          - Pointer to where to put the data
 281  *
 282  * RETURN:      Status
 283  *
 284  * DESCRIPTION: Read data from an operation region. The read starts from the
 285  *              beginning of the region.
 286  *
 287  ******************************************************************************/
 288
 289 static acpi_status
 290 acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer)
 291 {
 292         acpi_status status;
 293         u64 value;
 294         u32 region_offset = 0;
 295         u32 i;
 296
 297         /* Bytewise reads */
 298
 299         for (i = 0; i < length; i++) {
 300                 status = acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
 301                                                         region_offset, 8,
 302                                                         &value);
 303                 if (ACPI_FAILURE(status)) {
 304                         return status;
 305                 }
 306
 307                 *buffer = (u8)value;
 308                 buffer++;
 309                 region_offset++;
 310         }
 311
 312         return AE_OK;
 313 }
 314
 315 /*******************************************************************************
 316  *
 317  * FUNCTION:    acpi_ex_load_op
 318  *
 319  * PARAMETERS:  obj_desc        - Region or Buffer/Field where the table will be
 320  *                                obtained
 321  *              Target          - Where a handle to the table will be stored
 322  *              walk_state      - Current state
 323  *
 324  * RETURN:      Status
 325  *
 326  * DESCRIPTION: Load an ACPI table from a field or operation region
 327  *
 328  * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
 329  *       objects before this code is reached.
 330  *
 331  *       If source is an operation region, it must refer to system_memory, as
 332  *       per the ACPI specification.
 333  *
 334  ******************************************************************************/
 335
 336 acpi_status
 337 acpi_ex_load_op(union acpi_operand_object *obj_desc,
 338                 union acpi_operand_object *target,
 339                 struct acpi_walk_state *walk_state)
 340 {
 341         union acpi_operand_object *ddb_handle;
 342         struct acpi_table_header *table;
 343         struct acpi_table_desc table_desc;
 344         u32 table_index;
 345         acpi_status status;
 346         u32 length;
 347
 348         ACPI_FUNCTION_TRACE(ex_load_op);
 349
 350         ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
 351
 352         /* Source Object can be either an op_region or a Buffer/Field */
 353
 354         switch (obj_desc->common.type) {
 355         case ACPI_TYPE_REGION:
 356
 357                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 358                                   "Load table from Region %p\n", obj_desc));
 359
 360                 /* Region must be system_memory (from ACPI spec) */
 361
 362                 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
 363                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 364                 }
 365
 366                 /*
 367                  * If the Region Address and Length have not been previously evaluated,
 368                  * evaluate them now and save the results.
 369                  */
 370                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 371                         status = acpi_ds_get_region_arguments(obj_desc);
 372                         if (ACPI_FAILURE(status)) {
 373                                 return_ACPI_STATUS(status);
 374                         }
 375                 }
 376
 377                 /* Get the table header first so we can get the table length */
 378
 379                 table = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
 380                 if (!table) {
 381                         return_ACPI_STATUS(AE_NO_MEMORY);
 382                 }
 383
 384                 status =
 385                     acpi_ex_region_read(obj_desc,
 386                                         sizeof(struct acpi_table_header),
 387                                         ACPI_CAST_PTR(u8, table));
 388                 length = table->length;
 389                 ACPI_FREE(table);
 390
 391                 if (ACPI_FAILURE(status)) {
 392                         return_ACPI_STATUS(status);
 393                 }
 394
 395                 /* Must have at least an ACPI table header */
 396
 397                 if (length < sizeof(struct acpi_table_header)) {
 398                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 399                 }
 400
 401                 /*
 402                  * The original implementation simply mapped the table, with no copy.
 403                  * However, the memory region is not guaranteed to remain stable and
 404                  * we must copy the table to a local buffer. For example, the memory
 405                  * region is corrupted after suspend on some machines. Dynamically
 406                  * loaded tables are usually small, so this overhead is minimal.
 407                  *
 408                  * The latest implementation (5/2009) does not use a mapping at all.
 409                  * We use the low-level operation region interface to read the table
 410                  * instead of the obvious optimization of using a direct mapping.
 411                  * This maintains a consistent use of operation regions across the
 412                  * entire subsystem. This is important if additional processing must
 413                  * be performed in the (possibly user-installed) operation region
 414                  * handler. For example, acpi_exec and ASLTS depend on this.
 415                  */
 416
 417                 /* Allocate a buffer for the table */
 418
 419                 table_desc.pointer = ACPI_ALLOCATE(length);
 420                 if (!table_desc.pointer) {
 421                         return_ACPI_STATUS(AE_NO_MEMORY);
 422                 }
 423
 424                 /* Read the entire table */
 425
 426                 status = acpi_ex_region_read(obj_desc, length,
 427                                              ACPI_CAST_PTR(u8,
 428                                                            table_desc.pointer));
 429                 if (ACPI_FAILURE(status)) {
 430                         ACPI_FREE(table_desc.pointer);
 431                         return_ACPI_STATUS(status);
 432                 }
 433
 434                 table_desc.address = obj_desc->region.address;
 435                 break;
 436
 437         case ACPI_TYPE_BUFFER:  /* Buffer or resolved region_field */
 438
 439                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 440                                   "Load table from Buffer or Field %p\n",
 441                                   obj_desc));
 442
 443                 /* Must have at least an ACPI table header */
 444
 445                 if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
 446                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 447                 }
 448
 449                 /* Get the actual table length from the table header */
 450
 451                 table =
 452                     ACPI_CAST_PTR(struct acpi_table_header,
 453                                   obj_desc->buffer.pointer);
 454                 length = table->length;
 455
 456                 /* Table cannot extend beyond the buffer */
 457
 458                 if (length > obj_desc->buffer.length) {
 459                         return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
 460                 }
 461                 if (length < sizeof(struct acpi_table_header)) {
 462                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 463                 }
 464
 465                 /*
 466                  * Copy the table from the buffer because the buffer could be modified
 467                  * or even deleted in the future
 468                  */
 469                 table_desc.pointer = ACPI_ALLOCATE(length);
 470                 if (!table_desc.pointer) {
 471                         return_ACPI_STATUS(AE_NO_MEMORY);
 472                 }
 473
 474                 ACPI_MEMCPY(table_desc.pointer, table, length);
 475                 table_desc.address = ACPI_TO_INTEGER(table_desc.pointer);
 476                 break;
 477
 478         default:
 479                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 480         }
 481
 482         /* Validate table checksum (will not get validated in tb_add_table) */
 483
 484         status = acpi_tb_verify_checksum(table_desc.pointer, length);
 485         if (ACPI_FAILURE(status)) {
 486                 ACPI_FREE(table_desc.pointer);
 487                 return_ACPI_STATUS(status);
 488         }
 489
 490         /* Complete the table descriptor */
 491
 492         table_desc.length = length;
 493         table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED;
 494
 495         /* Install the new table into the local data structures */
 496
 497         status = acpi_tb_add_table(&table_desc, &table_index);
 498         if (ACPI_FAILURE(status)) {
 499
 500                 /* Delete allocated table buffer */
 501
 502                 acpi_tb_delete_table(&table_desc);
 503                 return_ACPI_STATUS(status);
 504         }
 505
 506         /*
 507          * Add the table to the namespace.
 508          *
 509          * Note: Load the table objects relative to the root of the namespace.
 510          * This appears to go against the ACPI specification, but we do it for
 511          * compatibility with other ACPI implementations.
 512          */
 513         status =
 514             acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle);
 515         if (ACPI_FAILURE(status)) {
 516
 517                 /* On error, table_ptr was deallocated above */
 518
 519                 return_ACPI_STATUS(status);
 520         }
 521
 522         /* Store the ddb_handle into the Target operand */
 523
 524         status = acpi_ex_store(ddb_handle, target, walk_state);
 525         if (ACPI_FAILURE(status)) {
 526                 (void)acpi_ex_unload_table(ddb_handle);
 527
 528                 /* table_ptr was deallocated above */
 529
 530                 acpi_ut_remove_reference(ddb_handle);
 531                 return_ACPI_STATUS(status);
 532         }
 533
 534         ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:"));
 535         acpi_tb_print_table_header(0, table_desc.pointer);
 536
 537         /* Remove the reference by added by acpi_ex_store above */
 538
 539         acpi_ut_remove_reference(ddb_handle);
 540
 541         /* Invoke table handler if present */
 542
 543         if (acpi_gbl_table_handler) {
 544                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD,
 545                                              table_desc.pointer,
 546                                              acpi_gbl_table_handler_context);
 547         }
 548
 549         return_ACPI_STATUS(status);
 550 }
 551
 552 /*******************************************************************************
 553  *
 554  * FUNCTION:    acpi_ex_unload_table
 555  *
 556  * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 557  *
 558  * RETURN:      Status
 559  *
 560  * DESCRIPTION: Unload an ACPI table
 561  *
 562  ******************************************************************************/
 563
 564 acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 565 {
 566         acpi_status status = AE_OK;
 567         union acpi_operand_object *table_desc = ddb_handle;
 568         u32 table_index;
 569         struct acpi_table_header *table;
 570
 571         ACPI_FUNCTION_TRACE(ex_unload_table);
 572
 573         /*
 574          * Validate the handle
 575          * Although the handle is partially validated in acpi_ex_reconfiguration()
 576          * when it calls acpi_ex_resolve_operands(), the handle is more completely
 577          * validated here.
 578          *
 579          * Handle must be a valid operand object of type reference. Also, the
 580          * ddb_handle must still be marked valid (table has not been previously
 581          * unloaded)
 582          */
 583         if ((!ddb_handle) ||
 584             (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
 585             (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
 586             (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
 587                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 588         }
 589
 590         /* Get the table index from the ddb_handle */
 591
 592         table_index = table_desc->reference.value;
 593
 594         /* Ensure the table is still loaded */
 595
 596         if (!acpi_tb_is_table_loaded(table_index)) {
 597                 return_ACPI_STATUS(AE_NOT_EXIST);
 598         }
 599
 600         /* Invoke table handler if present */
 601
 602         if (acpi_gbl_table_handler) {
 603                 status = acpi_get_table_by_index(table_index, &table);
 604                 if (ACPI_SUCCESS(status)) {
 605                         (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
 606                                                      table,
 607                                                      acpi_gbl_table_handler_context);
 608                 }
 609         }
 610
 611         /* Delete the portion of the namespace owned by this table */
 612
 613         status = acpi_tb_delete_namespace_by_owner(table_index);
 614         if (ACPI_FAILURE(status)) {
 615                 return_ACPI_STATUS(status);
 616         }
 617
 618         (void)acpi_tb_release_owner_id(table_index);
 619         acpi_tb_set_table_loaded_flag(table_index, FALSE);
 620
 621         /*
 622          * Invalidate the handle. We do this because the handle may be stored
 623          * in a named object and may not be actually deleted until much later.
 624          */
 625         ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
 626         return_ACPI_STATUS(AE_OK);
 627 }