drivers/acpi/acpica/exconfig.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
   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 "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         acpi_status status;
  86         union acpi_operand_object *obj_desc;
  87
  88         ACPI_FUNCTION_TRACE(ex_add_table);
  89
  90         /* Create an object to be the table handle */
  91
  92         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
  93         if (!obj_desc) {
  94                 return_ACPI_STATUS(AE_NO_MEMORY);
  95         }
  96
  97         /* Init the table handle */
  98
  99         obj_desc->common.flags |= AOPOBJ_DATA_VALID;
 100         obj_desc->reference.class = ACPI_REFCLASS_TABLE;
 101         *ddb_handle = obj_desc;
 102
 103         /* Install the new table into the local data structures */
 104
 105         obj_desc->reference.value = table_index;
 106
 107         /* Add the table to the namespace */
 108
 109         status = acpi_ns_load_table(table_index, parent_node);
 110         if (ACPI_FAILURE(status)) {
 111                 acpi_ut_remove_reference(obj_desc);
 112                 *ddb_handle = NULL;
 113                 return_ACPI_STATUS(status);
 114         }
 115
 116         /* Execute any module-level code that was found in the table */
 117
 118         acpi_ex_exit_interpreter();
 119         acpi_ns_exec_module_code_list();
 120         acpi_ex_enter_interpreter();
 121
 122         return_ACPI_STATUS(status);
 123 }
 124
 125 /*******************************************************************************
 126  *
 127  * FUNCTION:    acpi_ex_load_table_op
 128  *
 129  * PARAMETERS:  walk_state          - Current state with operands
 130  *              return_desc         - Where to store the return object
 131  *
 132  * RETURN:      Status
 133  *
 134  * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
 135  *
 136  ******************************************************************************/
 137
 138 acpi_status
 139 acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
 140                       union acpi_operand_object **return_desc)
 141 {
 142         acpi_status status;
 143         union acpi_operand_object **operand = &walk_state->operands[0];
 144         struct acpi_namespace_node *parent_node;
 145         struct acpi_namespace_node *start_node;
 146         struct acpi_namespace_node *parameter_node = NULL;
 147         union acpi_operand_object *ddb_handle;
 148         struct acpi_table_header *table;
 149         u32 table_index;
 150
 151         ACPI_FUNCTION_TRACE(ex_load_table_op);
 152
 153         /* Validate lengths for the signature_string, OEMIDString, OEMtable_iD */
 154
 155         if ((operand[0]->string.length > ACPI_NAME_SIZE) ||
 156             (operand[1]->string.length > ACPI_OEM_ID_SIZE) ||
 157             (operand[2]->string.length > ACPI_OEM_TABLE_ID_SIZE)) {
 158                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 159         }
 160
 161         /* Find the ACPI table in the RSDT/XSDT */
 162
 163         status = acpi_tb_find_table(operand[0]->string.pointer,
 164                                     operand[1]->string.pointer,
 165                                     operand[2]->string.pointer, &table_index);
 166         if (ACPI_FAILURE(status)) {
 167                 if (status != AE_NOT_FOUND) {
 168                         return_ACPI_STATUS(status);
 169                 }
 170
 171                 /* Table not found, return an Integer=0 and AE_OK */
 172
 173                 ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 174                 if (!ddb_handle) {
 175                         return_ACPI_STATUS(AE_NO_MEMORY);
 176                 }
 177
 178                 ddb_handle->integer.value = 0;
 179                 *return_desc = ddb_handle;
 180
 181                 return_ACPI_STATUS(AE_OK);
 182         }
 183
 184         /* Default nodes */
 185
 186         start_node = walk_state->scope_info->scope.node;
 187         parent_node = acpi_gbl_root_node;
 188
 189         /* root_path (optional parameter) */
 190
 191         if (operand[3]->string.length > 0) {
 192                 /*
 193                  * Find the node referenced by the root_path_string. This is the
 194                  * location within the namespace where the table will be loaded.
 195                  */
 196                 status =
 197                     acpi_ns_get_node(start_node, operand[3]->string.pointer,
 198                                      ACPI_NS_SEARCH_PARENT, &parent_node);
 199                 if (ACPI_FAILURE(status)) {
 200                         return_ACPI_STATUS(status);
 201                 }
 202         }
 203
 204         /* parameter_path (optional parameter) */
 205
 206         if (operand[4]->string.length > 0) {
 207                 if ((operand[4]->string.pointer[0] != '\\') &&
 208                     (operand[4]->string.pointer[0] != '^')) {
 209                         /*
 210                          * Path is not absolute, so it will be relative to the node
 211                          * referenced by the root_path_string (or the NS root if omitted)
 212                          */
 213                         start_node = parent_node;
 214                 }
 215
 216                 /* Find the node referenced by the parameter_path_string */
 217
 218                 status =
 219                     acpi_ns_get_node(start_node, operand[4]->string.pointer,
 220                                      ACPI_NS_SEARCH_PARENT, &parameter_node);
 221                 if (ACPI_FAILURE(status)) {
 222                         return_ACPI_STATUS(status);
 223                 }
 224         }
 225
 226         /* Load the table into the namespace */
 227
 228         status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
 229         if (ACPI_FAILURE(status)) {
 230                 return_ACPI_STATUS(status);
 231         }
 232
 233         /* Parameter Data (optional) */
 234
 235         if (parameter_node) {
 236
 237                 /* Store the parameter data into the optional parameter object */
 238
 239                 status = acpi_ex_store(operand[5],
 240                                        ACPI_CAST_PTR(union acpi_operand_object,
 241                                                      parameter_node),
 242                                        walk_state);
 243                 if (ACPI_FAILURE(status)) {
 244                         (void)acpi_ex_unload_table(ddb_handle);
 245
 246                         acpi_ut_remove_reference(ddb_handle);
 247                         return_ACPI_STATUS(status);
 248                 }
 249         }
 250
 251         status = acpi_get_table_by_index(table_index, &table);
 252         if (ACPI_SUCCESS(status)) {
 253                 ACPI_INFO((AE_INFO,
 254                            "Dynamic OEM Table Load - [%.4s] OemId [%.6s] OemTableId [%.8s]",
 255                            table->signature, table->oem_id,
 256                            table->oem_table_id));
 257         }
 258
 259         /* Invoke table handler if present */
 260
 261         if (acpi_gbl_table_handler) {
 262                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 263                                              acpi_gbl_table_handler_context);
 264         }
 265
 266         *return_desc = ddb_handle;
 267         return_ACPI_STATUS(status);
 268 }
 269
 270 /*******************************************************************************
 271  *
 272  * FUNCTION:    acpi_ex_region_read
 273  *
 274  * PARAMETERS:  obj_desc        - Region descriptor
 275  *              Length          - Number of bytes to read
 276  *              Buffer          - Pointer to where to put the data
 277  *
 278  * RETURN:      Status
 279  *
 280  * DESCRIPTION: Read data from an operation region. The read starts from the
 281  *              beginning of the region.
 282  *
 283  ******************************************************************************/
 284
 285 static acpi_status
 286 acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer)
 287 {
 288         acpi_status status;
 289         acpi_integer value;
 290         u32 region_offset = 0;
 291         u32 i;
 292
 293         /* Bytewise reads */
 294
 295         for (i = 0; i < length; i++) {
 296                 status = acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
 297                                                         region_offset, 8,
 298                                                         &value);
 299                 if (ACPI_FAILURE(status)) {
 300                         return status;
 301                 }
 302
 303                 *buffer = (u8)value;
 304                 buffer++;
 305                 region_offset++;
 306         }
 307
 308         return AE_OK;
 309 }
 310
 311 /*******************************************************************************
 312  *
 313  * FUNCTION:    acpi_ex_load_op
 314  *
 315  * PARAMETERS:  obj_desc        - Region or Buffer/Field where the table will be
 316  *                                obtained
 317  *              Target          - Where a handle to the table will be stored
 318  *              walk_state      - Current state
 319  *
 320  * RETURN:      Status
 321  *
 322  * DESCRIPTION: Load an ACPI table from a field or operation region
 323  *
 324  * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
 325  *       objects before this code is reached.
 326  *
 327  *       If source is an operation region, it must refer to system_memory, as
 328  *       per the ACPI specification.
 329  *
 330  ******************************************************************************/
 331
 332 acpi_status
 333 acpi_ex_load_op(union acpi_operand_object *obj_desc,
 334                 union acpi_operand_object *target,
 335                 struct acpi_walk_state *walk_state)
 336 {
 337         union acpi_operand_object *ddb_handle;
 338         struct acpi_table_header *table;
 339         struct acpi_table_desc table_desc;
 340         u32 table_index;
 341         acpi_status status;
 342         u32 length;
 343
 344         ACPI_FUNCTION_TRACE(ex_load_op);
 345
 346         ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
 347
 348         /* Source Object can be either an op_region or a Buffer/Field */
 349
 350         switch (obj_desc->common.type) {
 351         case ACPI_TYPE_REGION:
 352
 353                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 354                                   "Load table from Region %p\n", obj_desc));
 355
 356                 /* Region must be system_memory (from ACPI spec) */
 357
 358                 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
 359                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 360                 }
 361
 362                 /*
 363                  * If the Region Address and Length have not been previously evaluated,
 364                  * evaluate them now and save the results.
 365                  */
 366                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 367                         status = acpi_ds_get_region_arguments(obj_desc);
 368                         if (ACPI_FAILURE(status)) {
 369                                 return_ACPI_STATUS(status);
 370                         }
 371                 }
 372
 373                 /* Get the table header first so we can get the table length */
 374
 375                 table = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
 376                 if (!table) {
 377                         return_ACPI_STATUS(AE_NO_MEMORY);
 378                 }
 379
 380                 status =
 381                     acpi_ex_region_read(obj_desc,
 382                                         sizeof(struct acpi_table_header),
 383                                         ACPI_CAST_PTR(u8, table));
 384                 length = table->length;
 385                 ACPI_FREE(table);
 386
 387                 if (ACPI_FAILURE(status)) {
 388                         return_ACPI_STATUS(status);
 389                 }
 390
 391                 /* Must have at least an ACPI table header */
 392
 393                 if (length < sizeof(struct acpi_table_header)) {
 394                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 395                 }
 396
 397                 /*
 398                  * The original implementation simply mapped the table, with no copy.
 399                  * However, the memory region is not guaranteed to remain stable and
 400                  * we must copy the table to a local buffer. For example, the memory
 401                  * region is corrupted after suspend on some machines. Dynamically
 402                  * loaded tables are usually small, so this overhead is minimal.
 403                  *
 404                  * The latest implementation (5/2009) does not use a mapping at all.
 405                  * We use the low-level operation region interface to read the table
 406                  * instead of the obvious optimization of using a direct mapping.
 407                  * This maintains a consistent use of operation regions across the
 408                  * entire subsystem. This is important if additional processing must
 409                  * be performed in the (possibly user-installed) operation region
 410                  * handler. For example, acpi_exec and ASLTS depend on this.
 411                  */
 412
 413                 /* Allocate a buffer for the table */
 414
 415                 table_desc.pointer = ACPI_ALLOCATE(length);
 416                 if (!table_desc.pointer) {
 417                         return_ACPI_STATUS(AE_NO_MEMORY);
 418                 }
 419
 420                 /* Read the entire table */
 421
 422                 status = acpi_ex_region_read(obj_desc, length,
 423                                              ACPI_CAST_PTR(u8,
 424                                                            table_desc.pointer));
 425                 if (ACPI_FAILURE(status)) {
 426                         ACPI_FREE(table_desc.pointer);
 427                         return_ACPI_STATUS(status);
 428                 }
 429
 430                 table_desc.address = obj_desc->region.address;
 431                 break;
 432
 433         case ACPI_TYPE_BUFFER:  /* Buffer or resolved region_field */
 434
 435                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 436                                   "Load table from Buffer or Field %p\n",
 437                                   obj_desc));
 438
 439                 /* Must have at least an ACPI table header */
 440
 441                 if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
 442                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 443                 }
 444
 445                 /* Get the actual table length from the table header */
 446
 447                 table =
 448                     ACPI_CAST_PTR(struct acpi_table_header,
 449                                   obj_desc->buffer.pointer);
 450                 length = table->length;
 451
 452                 /* Table cannot extend beyond the buffer */
 453
 454                 if (length > obj_desc->buffer.length) {
 455                         return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
 456                 }
 457                 if (length < sizeof(struct acpi_table_header)) {
 458                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 459                 }
 460
 461                 /*
 462                  * Copy the table from the buffer because the buffer could be modified
 463                  * or even deleted in the future
 464                  */
 465                 table_desc.pointer = ACPI_ALLOCATE(length);
 466                 if (!table_desc.pointer) {
 467                         return_ACPI_STATUS(AE_NO_MEMORY);
 468                 }
 469
 470                 ACPI_MEMCPY(table_desc.pointer, table, length);
 471                 table_desc.address = ACPI_TO_INTEGER(table_desc.pointer);
 472                 break;
 473
 474         default:
 475                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 476         }
 477
 478         /* Validate table checksum (will not get validated in tb_add_table) */
 479
 480         status = acpi_tb_verify_checksum(table_desc.pointer, length);
 481         if (ACPI_FAILURE(status)) {
 482                 ACPI_FREE(table_desc.pointer);
 483                 return_ACPI_STATUS(status);
 484         }
 485
 486         /* Complete the table descriptor */
 487
 488         table_desc.length = length;
 489         table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED;
 490
 491         /* Install the new table into the local data structures */
 492
 493         status = acpi_tb_add_table(&table_desc, &table_index);
 494         if (ACPI_FAILURE(status)) {
 495                 goto cleanup;
 496         }
 497
 498         /*
 499          * Add the table to the namespace.
 500          *
 501          * Note: Load the table objects relative to the root of the namespace.
 502          * This appears to go against the ACPI specification, but we do it for
 503          * compatibility with other ACPI implementations.
 504          */
 505         status =
 506             acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle);
 507         if (ACPI_FAILURE(status)) {
 508
 509                 /* On error, table_ptr was deallocated above */
 510
 511                 return_ACPI_STATUS(status);
 512         }
 513
 514         /* Store the ddb_handle into the Target operand */
 515
 516         status = acpi_ex_store(ddb_handle, target, walk_state);
 517         if (ACPI_FAILURE(status)) {
 518                 (void)acpi_ex_unload_table(ddb_handle);
 519
 520                 /* table_ptr was deallocated above */
 521
 522                 acpi_ut_remove_reference(ddb_handle);
 523                 return_ACPI_STATUS(status);
 524         }
 525
 526         /* Remove the reference by added by acpi_ex_store above */
 527
 528         acpi_ut_remove_reference(ddb_handle);
 529
 530         /* Invoke table handler if present */
 531
 532         if (acpi_gbl_table_handler) {
 533                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD,
 534                                              table_desc.pointer,
 535                                              acpi_gbl_table_handler_context);
 536         }
 537
 538       cleanup:
 539         if (ACPI_FAILURE(status)) {
 540
 541                 /* Delete allocated table buffer */
 542
 543                 acpi_tb_delete_table(&table_desc);
 544         }
 545         return_ACPI_STATUS(status);
 546 }
 547
 548 /*******************************************************************************
 549  *
 550  * FUNCTION:    acpi_ex_unload_table
 551  *
 552  * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 553  *
 554  * RETURN:      Status
 555  *
 556  * DESCRIPTION: Unload an ACPI table
 557  *
 558  ******************************************************************************/
 559
 560 acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 561 {
 562         acpi_status status = AE_OK;
 563         union acpi_operand_object *table_desc = ddb_handle;
 564         u32 table_index;
 565         struct acpi_table_header *table;
 566
 567         ACPI_FUNCTION_TRACE(ex_unload_table);
 568
 569         /*
 570          * Validate the handle
 571          * Although the handle is partially validated in acpi_ex_reconfiguration()
 572          * when it calls acpi_ex_resolve_operands(), the handle is more completely
 573          * validated here.
 574          *
 575          * Handle must be a valid operand object of type reference. Also, the
 576          * ddb_handle must still be marked valid (table has not been previously
 577          * unloaded)
 578          */
 579         if ((!ddb_handle) ||
 580             (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
 581             (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
 582             (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
 583                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 584         }
 585
 586         /* Get the table index from the ddb_handle */
 587
 588         table_index = table_desc->reference.value;
 589
 590         /* Ensure the table is still loaded */
 591
 592         if (!acpi_tb_is_table_loaded(table_index)) {
 593                 return_ACPI_STATUS(AE_NOT_EXIST);
 594         }
 595
 596         /* Invoke table handler if present */
 597
 598         if (acpi_gbl_table_handler) {
 599                 status = acpi_get_table_by_index(table_index, &table);
 600                 if (ACPI_SUCCESS(status)) {
 601                         (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
 602                                                      table,
 603                                                      acpi_gbl_table_handler_context);
 604                 }
 605         }
 606
 607         /* Delete the portion of the namespace owned by this table */
 608
 609         status = acpi_tb_delete_namespace_by_owner(table_index);
 610         if (ACPI_FAILURE(status)) {
 611                 return_ACPI_STATUS(status);
 612         }
 613
 614         (void)acpi_tb_release_owner_id(table_index);
 615         acpi_tb_set_table_loaded_flag(table_index, FALSE);
 616
 617         /*
 618          * Invalidate the handle. We do this because the handle may be stored
 619          * in a named object and may not be actually deleted until much later.
 620          */
 621         ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
 622         return_ACPI_STATUS(AE_OK);
 623 }