drivers/acpi/acpica/exconfig.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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 #include "amlcode.h"
  52
  53 #define _COMPONENT          ACPI_EXECUTER
  54 ACPI_MODULE_NAME("exconfig")
  55
  56 /* Local prototypes */
  57 static acpi_status
  58 acpi_ex_add_table(u32 table_index,
  59                   struct acpi_namespace_node *parent_node,
  60                   union acpi_operand_object **ddb_handle);
  61
  62 static acpi_status
  63 acpi_ex_region_read(union acpi_operand_object *obj_desc,
  64                     u32 length, u8 *buffer);
  65
  66 /*******************************************************************************
  67  *
  68  * FUNCTION:    acpi_ex_add_table
  69  *
  70  * PARAMETERS:  table               - Pointer to raw table
  71  *              parent_node         - Where to load the table (scope)
  72  *              ddb_handle          - Where to return the table handle.
  73  *
  74  * RETURN:      Status
  75  *
  76  * DESCRIPTION: Common function to Install and Load an ACPI table with a
  77  *              returned table handle.
  78  *
  79  ******************************************************************************/
  80
  81 static acpi_status
  82 acpi_ex_add_table(u32 table_index,
  83                   struct acpi_namespace_node *parent_node,
  84                   union acpi_operand_object **ddb_handle)
  85 {
  86         union acpi_operand_object *obj_desc;
  87         acpi_status status;
  88         acpi_owner_id owner_id;
  89
  90         ACPI_FUNCTION_TRACE(ex_add_table);
  91
  92         /* Create an object to be the table handle */
  93
  94         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
  95         if (!obj_desc) {
  96                 return_ACPI_STATUS(AE_NO_MEMORY);
  97         }
  98
  99         /* Init the table handle */
 100
 101         obj_desc->common.flags |= AOPOBJ_DATA_VALID;
 102         obj_desc->reference.class = ACPI_REFCLASS_TABLE;
 103         *ddb_handle = obj_desc;
 104
 105         /* Install the new table into the local data structures */
 106
 107         obj_desc->reference.value = table_index;
 108
 109         /* Add the table to the namespace */
 110
 111         status = acpi_ns_load_table(table_index, parent_node);
 112         if (ACPI_FAILURE(status)) {
 113                 acpi_ut_remove_reference(obj_desc);
 114                 *ddb_handle = NULL;
 115                 return_ACPI_STATUS(status);
 116         }
 117
 118         /* Execute any module-level code that was found in the table */
 119
 120         acpi_ex_exit_interpreter();
 121         acpi_ns_exec_module_code_list();
 122         acpi_ex_enter_interpreter();
 123
 124         /*
 125          * Update GPEs for any new _Lxx/_Exx methods. Ignore errors. The host is
 126          * responsible for discovering any new wake GPEs by running _PRW methods
 127          * that may have been loaded by this table.
 128          */
 129         status = acpi_tb_get_owner_id(table_index, &owner_id);
 130         if (ACPI_SUCCESS(status)) {
 131                 acpi_ev_update_gpes(owner_id);
 132         }
 133
 134         return_ACPI_STATUS(AE_OK);
 135 }
 136
 137 /*******************************************************************************
 138  *
 139  * FUNCTION:    acpi_ex_load_table_op
 140  *
 141  * PARAMETERS:  walk_state          - Current state with operands
 142  *              return_desc         - Where to store the return object
 143  *
 144  * RETURN:      Status
 145  *
 146  * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
 147  *
 148  ******************************************************************************/
 149
 150 acpi_status
 151 acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
 152                       union acpi_operand_object **return_desc)
 153 {
 154         acpi_status status;
 155         union acpi_operand_object **operand = &walk_state->operands[0];
 156         struct acpi_namespace_node *parent_node;
 157         struct acpi_namespace_node *start_node;
 158         struct acpi_namespace_node *parameter_node = NULL;
 159         union acpi_operand_object *ddb_handle;
 160         struct acpi_table_header *table;
 161         u32 table_index;
 162
 163         ACPI_FUNCTION_TRACE(ex_load_table_op);
 164
 165         /* Validate lengths for the Signature, oem_id, and oem_table_id strings */
 166
 167         if ((operand[0]->string.length > ACPI_NAME_SIZE) ||
 168             (operand[1]->string.length > ACPI_OEM_ID_SIZE) ||
 169             (operand[2]->string.length > ACPI_OEM_TABLE_ID_SIZE)) {
 170                 return_ACPI_STATUS(AE_AML_STRING_LIMIT);
 171         }
 172
 173         /* Find the ACPI table in the RSDT/XSDT */
 174
 175         status = acpi_tb_find_table(operand[0]->string.pointer,
 176                                     operand[1]->string.pointer,
 177                                     operand[2]->string.pointer, &table_index);
 178         if (ACPI_FAILURE(status)) {
 179                 if (status != AE_NOT_FOUND) {
 180                         return_ACPI_STATUS(status);
 181                 }
 182
 183                 /* Table not found, return an Integer=0 and AE_OK */
 184
 185                 ddb_handle = acpi_ut_create_integer_object((u64) 0);
 186                 if (!ddb_handle) {
 187                         return_ACPI_STATUS(AE_NO_MEMORY);
 188                 }
 189
 190                 *return_desc = ddb_handle;
 191                 return_ACPI_STATUS(AE_OK);
 192         }
 193
 194         /* Default nodes */
 195
 196         start_node = walk_state->scope_info->scope.node;
 197         parent_node = acpi_gbl_root_node;
 198
 199         /* root_path (optional parameter) */
 200
 201         if (operand[3]->string.length > 0) {
 202                 /*
 203                  * Find the node referenced by the root_path_string. This is the
 204                  * location within the namespace where the table will be loaded.
 205                  */
 206                 status =
 207                     acpi_ns_get_node(start_node, operand[3]->string.pointer,
 208                                      ACPI_NS_SEARCH_PARENT, &parent_node);
 209                 if (ACPI_FAILURE(status)) {
 210                         return_ACPI_STATUS(status);
 211                 }
 212         }
 213
 214         /* parameter_path (optional parameter) */
 215
 216         if (operand[4]->string.length > 0) {
 217                 if ((operand[4]->string.pointer[0] != AML_ROOT_PREFIX) &&
 218                     (operand[4]->string.pointer[0] != AML_PARENT_PREFIX)) {
 219                         /*
 220                          * Path is not absolute, so it will be relative to the node
 221                          * referenced by the root_path_string (or the NS root if omitted)
 222                          */
 223                         start_node = parent_node;
 224                 }
 225
 226                 /* Find the node referenced by the parameter_path_string */
 227
 228                 status =
 229                     acpi_ns_get_node(start_node, operand[4]->string.pointer,
 230                                      ACPI_NS_SEARCH_PARENT, &parameter_node);
 231                 if (ACPI_FAILURE(status)) {
 232                         return_ACPI_STATUS(status);
 233                 }
 234         }
 235
 236         /* Load the table into the namespace */
 237
 238         status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
 239         if (ACPI_FAILURE(status)) {
 240                 return_ACPI_STATUS(status);
 241         }
 242
 243         /* Parameter Data (optional) */
 244
 245         if (parameter_node) {
 246
 247                 /* Store the parameter data into the optional parameter object */
 248
 249                 status = acpi_ex_store(operand[5],
 250                                        ACPI_CAST_PTR(union acpi_operand_object,
 251                                                      parameter_node),
 252                                        walk_state);
 253                 if (ACPI_FAILURE(status)) {
 254                         (void)acpi_ex_unload_table(ddb_handle);
 255
 256                         acpi_ut_remove_reference(ddb_handle);
 257                         return_ACPI_STATUS(status);
 258                 }
 259         }
 260
 261         status = acpi_get_table_by_index(table_index, &table);
 262         if (ACPI_SUCCESS(status)) {
 263                 ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:"));
 264                 acpi_tb_print_table_header(0, table);
 265         }
 266
 267         /* Invoke table handler if present */
 268
 269         if (acpi_gbl_table_handler) {
 270                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 271                                              acpi_gbl_table_handler_context);
 272         }
 273
 274         *return_desc = ddb_handle;
 275         return_ACPI_STATUS(status);
 276 }
 277
 278 /*******************************************************************************
 279  *
 280  * FUNCTION:    acpi_ex_region_read
 281  *
 282  * PARAMETERS:  obj_desc        - Region descriptor
 283  *              length          - Number of bytes to read
 284  *              buffer          - Pointer to where to put the data
 285  *
 286  * RETURN:      Status
 287  *
 288  * DESCRIPTION: Read data from an operation region. The read starts from the
 289  *              beginning of the region.
 290  *
 291  ******************************************************************************/
 292
 293 static acpi_status
 294 acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer)
 295 {
 296         acpi_status status;
 297         u64 value;
 298         u32 region_offset = 0;
 299         u32 i;
 300
 301         /* Bytewise reads */
 302
 303         for (i = 0; i < length; i++) {
 304                 status =
 305                     acpi_ev_address_space_dispatch(obj_desc, NULL, ACPI_READ,
 306                                                    region_offset, 8, &value);
 307                 if (ACPI_FAILURE(status)) {
 308                         return (status);
 309                 }
 310
 311                 *buffer = (u8)value;
 312                 buffer++;
 313                 region_offset++;
 314         }
 315
 316         return (AE_OK);
 317 }
 318
 319 /*******************************************************************************
 320  *
 321  * FUNCTION:    acpi_ex_load_op
 322  *
 323  * PARAMETERS:  obj_desc        - Region or Buffer/Field where the table will be
 324  *                                obtained
 325  *              target          - Where a handle to the table will be stored
 326  *              walk_state      - Current state
 327  *
 328  * RETURN:      Status
 329  *
 330  * DESCRIPTION: Load an ACPI table from a field or operation region
 331  *
 332  * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
 333  *       objects before this code is reached.
 334  *
 335  *       If source is an operation region, it must refer to system_memory, as
 336  *       per the ACPI specification.
 337  *
 338  ******************************************************************************/
 339
 340 acpi_status
 341 acpi_ex_load_op(union acpi_operand_object *obj_desc,
 342                 union acpi_operand_object *target,
 343                 struct acpi_walk_state *walk_state)
 344 {
 345         union acpi_operand_object *ddb_handle;
 346         struct acpi_table_header *table_header;
 347         struct acpi_table_header *table;
 348         u32 table_index;
 349         acpi_status status;
 350         u32 length;
 351
 352         ACPI_FUNCTION_TRACE(ex_load_op);
 353
 354         /* Source Object can be either an op_region or a Buffer/Field */
 355
 356         switch (obj_desc->common.type) {
 357         case ACPI_TYPE_REGION:
 358
 359                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 360                                   "Load table from Region %p\n", obj_desc));
 361
 362                 /* Region must be system_memory (from ACPI spec) */
 363
 364                 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
 365                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 366                 }
 367
 368                 /*
 369                  * If the Region Address and Length have not been previously evaluated,
 370                  * evaluate them now and save the results.
 371                  */
 372                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 373                         status = acpi_ds_get_region_arguments(obj_desc);
 374                         if (ACPI_FAILURE(status)) {
 375                                 return_ACPI_STATUS(status);
 376                         }
 377                 }
 378
 379                 /* Get the table header first so we can get the table length */
 380
 381                 table_header = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
 382                 if (!table_header) {
 383                         return_ACPI_STATUS(AE_NO_MEMORY);
 384                 }
 385
 386                 status =
 387                     acpi_ex_region_read(obj_desc,
 388                                         sizeof(struct acpi_table_header),
 389                                         ACPI_CAST_PTR(u8, table_header));
 390                 length = table_header->length;
 391                 ACPI_FREE(table_header);
 392
 393                 if (ACPI_FAILURE(status)) {
 394                         return_ACPI_STATUS(status);
 395                 }
 396
 397                 /* Must have at least an ACPI table header */
 398
 399                 if (length < sizeof(struct acpi_table_header)) {
 400                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 401                 }
 402
 403                 /*
 404                  * The original implementation simply mapped the table, with no copy.
 405                  * However, the memory region is not guaranteed to remain stable and
 406                  * we must copy the table to a local buffer. For example, the memory
 407                  * region is corrupted after suspend on some machines. Dynamically
 408                  * loaded tables are usually small, so this overhead is minimal.
 409                  *
 410                  * The latest implementation (5/2009) does not use a mapping at all.
 411                  * We use the low-level operation region interface to read the table
 412                  * instead of the obvious optimization of using a direct mapping.
 413                  * This maintains a consistent use of operation regions across the
 414                  * entire subsystem. This is important if additional processing must
 415                  * be performed in the (possibly user-installed) operation region
 416                  * handler. For example, acpi_exec and ASLTS depend on this.
 417                  */
 418
 419                 /* Allocate a buffer for the table */
 420
 421                 table = ACPI_ALLOCATE(length);
 422                 if (!table) {
 423                         return_ACPI_STATUS(AE_NO_MEMORY);
 424                 }
 425
 426                 /* Read the entire table */
 427
 428                 status = acpi_ex_region_read(obj_desc, length,
 429                                              ACPI_CAST_PTR(u8, table));
 430                 if (ACPI_FAILURE(status)) {
 431                         ACPI_FREE(table);
 432                         return_ACPI_STATUS(status);
 433                 }
 434                 break;
 435
 436         case ACPI_TYPE_BUFFER:  /* Buffer or resolved region_field */
 437
 438                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 439                                   "Load table from Buffer or Field %p\n",
 440                                   obj_desc));
 441
 442                 /* Must have at least an ACPI table header */
 443
 444                 if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
 445                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 446                 }
 447
 448                 /* Get the actual table length from the table header */
 449
 450                 table_header =
 451                     ACPI_CAST_PTR(struct acpi_table_header,
 452                                   obj_desc->buffer.pointer);
 453                 length = table_header->length;
 454
 455                 /* Table cannot extend beyond the buffer */
 456
 457                 if (length > obj_desc->buffer.length) {
 458                         return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
 459                 }
 460                 if (length < sizeof(struct acpi_table_header)) {
 461                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 462                 }
 463
 464                 /*
 465                  * Copy the table from the buffer because the buffer could be modified
 466                  * or even deleted in the future
 467                  */
 468                 table = ACPI_ALLOCATE(length);
 469                 if (!table) {
 470                         return_ACPI_STATUS(AE_NO_MEMORY);
 471                 }
 472
 473                 ACPI_MEMCPY(table, table_header, length);
 474                 break;
 475
 476         default:
 477
 478                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 479         }
 480
 481         /* Install the new table into the local data structures */
 482
 483         ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:"));
 484         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 485
 486         status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table),
 487                                                 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
 488                                                 TRUE, TRUE, &table_index);
 489
 490         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 491         if (ACPI_FAILURE(status)) {
 492
 493                 /* Delete allocated table buffer */
 494
 495                 ACPI_FREE(table);
 496                 return_ACPI_STATUS(status);
 497         }
 498
 499         /*
 500          * Note: Now table is "INSTALLED", it must be validated before
 501          * loading.
 502          */
 503         status =
 504             acpi_tb_validate_table(&acpi_gbl_root_table_list.
 505                                    tables[table_index]);
 506         if (ACPI_FAILURE(status)) {
 507                 return_ACPI_STATUS(status);
 508         }
 509
 510         /*
 511          * Add the table to the namespace.
 512          *
 513          * Note: Load the table objects relative to the root of the namespace.
 514          * This appears to go against the ACPI specification, but we do it for
 515          * compatibility with other ACPI implementations.
 516          */
 517         status =
 518             acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle);
 519         if (ACPI_FAILURE(status)) {
 520
 521                 /* On error, table_ptr was deallocated above */
 522
 523                 return_ACPI_STATUS(status);
 524         }
 525
 526         /* Store the ddb_handle into the Target operand */
 527
 528         status = acpi_ex_store(ddb_handle, target, walk_state);
 529         if (ACPI_FAILURE(status)) {
 530                 (void)acpi_ex_unload_table(ddb_handle);
 531
 532                 /* table_ptr was deallocated above */
 533
 534                 acpi_ut_remove_reference(ddb_handle);
 535                 return_ACPI_STATUS(status);
 536         }
 537
 538         /* Remove the reference by added by acpi_ex_store above */
 539
 540         acpi_ut_remove_reference(ddb_handle);
 541
 542         /* Invoke table handler if present */
 543
 544         if (acpi_gbl_table_handler) {
 545                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 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          * Temporarily emit a warning so that the ASL for the machine can be
 575          * hopefully obtained. This is to say that the Unload() operator is
 576          * extremely rare if not completely unused.
 577          */
 578         ACPI_WARNING((AE_INFO, "Received request to unload an ACPI table"));
 579
 580         /*
 581          * Validate the handle
 582          * Although the handle is partially validated in acpi_ex_reconfiguration()
 583          * when it calls acpi_ex_resolve_operands(), the handle is more completely
 584          * validated here.
 585          *
 586          * Handle must be a valid operand object of type reference. Also, the
 587          * ddb_handle must still be marked valid (table has not been previously
 588          * unloaded)
 589          */
 590         if ((!ddb_handle) ||
 591             (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
 592             (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
 593             (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
 594                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 595         }
 596
 597         /* Get the table index from the ddb_handle */
 598
 599         table_index = table_desc->reference.value;
 600
 601         /* Ensure the table is still loaded */
 602
 603         if (!acpi_tb_is_table_loaded(table_index)) {
 604                 return_ACPI_STATUS(AE_NOT_EXIST);
 605         }
 606
 607         /* Invoke table handler if present */
 608
 609         if (acpi_gbl_table_handler) {
 610                 status = acpi_get_table_by_index(table_index, &table);
 611                 if (ACPI_SUCCESS(status)) {
 612                         (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
 613                                                      table,
 614                                                      acpi_gbl_table_handler_context);
 615                 }
 616         }
 617
 618         /* Delete the portion of the namespace owned by this table */
 619
 620         status = acpi_tb_delete_namespace_by_owner(table_index);
 621         if (ACPI_FAILURE(status)) {
 622                 return_ACPI_STATUS(status);
 623         }
 624
 625         (void)acpi_tb_release_owner_id(table_index);
 626         acpi_tb_set_table_loaded_flag(table_index, FALSE);
 627
 628         /*
 629          * Invalidate the handle. We do this because the handle may be stored
 630          * in a named object and may not be actually deleted until much later.
 631          */
 632         ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
 633         return_ACPI_STATUS(AE_OK);
 634 }