kernel/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         /* Find the ACPI table in the RSDT/XSDT */
 166
 167         status = acpi_tb_find_table(operand[0]->string.pointer,
 168                                     operand[1]->string.pointer,
 169                                     operand[2]->string.pointer, &table_index);
 170         if (ACPI_FAILURE(status)) {
 171                 if (status != AE_NOT_FOUND) {
 172                         return_ACPI_STATUS(status);
 173                 }
 174
 175                 /* Table not found, return an Integer=0 and AE_OK */
 176
 177                 ddb_handle = acpi_ut_create_integer_object((u64) 0);
 178                 if (!ddb_handle) {
 179                         return_ACPI_STATUS(AE_NO_MEMORY);
 180                 }
 181
 182                 *return_desc = ddb_handle;
 183                 return_ACPI_STATUS(AE_OK);
 184         }
 185
 186         /* Default nodes */
 187
 188         start_node = walk_state->scope_info->scope.node;
 189         parent_node = acpi_gbl_root_node;
 190
 191         /* root_path (optional parameter) */
 192
 193         if (operand[3]->string.length > 0) {
 194                 /*
 195                  * Find the node referenced by the root_path_string. This is the
 196                  * location within the namespace where the table will be loaded.
 197                  */
 198                 status =
 199                     acpi_ns_get_node(start_node, operand[3]->string.pointer,
 200                                      ACPI_NS_SEARCH_PARENT, &parent_node);
 201                 if (ACPI_FAILURE(status)) {
 202                         return_ACPI_STATUS(status);
 203                 }
 204         }
 205
 206         /* parameter_path (optional parameter) */
 207
 208         if (operand[4]->string.length > 0) {
 209                 if ((operand[4]->string.pointer[0] != AML_ROOT_PREFIX) &&
 210                     (operand[4]->string.pointer[0] != AML_PARENT_PREFIX)) {
 211                         /*
 212                          * Path is not absolute, so it will be relative to the node
 213                          * referenced by the root_path_string (or the NS root if omitted)
 214                          */
 215                         start_node = parent_node;
 216                 }
 217
 218                 /* Find the node referenced by the parameter_path_string */
 219
 220                 status =
 221                     acpi_ns_get_node(start_node, operand[4]->string.pointer,
 222                                      ACPI_NS_SEARCH_PARENT, &parameter_node);
 223                 if (ACPI_FAILURE(status)) {
 224                         return_ACPI_STATUS(status);
 225                 }
 226         }
 227
 228         /* Load the table into the namespace */
 229
 230         status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
 231         if (ACPI_FAILURE(status)) {
 232                 return_ACPI_STATUS(status);
 233         }
 234
 235         /* Parameter Data (optional) */
 236
 237         if (parameter_node) {
 238
 239                 /* Store the parameter data into the optional parameter object */
 240
 241                 status = acpi_ex_store(operand[5],
 242                                        ACPI_CAST_PTR(union acpi_operand_object,
 243                                                      parameter_node),
 244                                        walk_state);
 245                 if (ACPI_FAILURE(status)) {
 246                         (void)acpi_ex_unload_table(ddb_handle);
 247
 248                         acpi_ut_remove_reference(ddb_handle);
 249                         return_ACPI_STATUS(status);
 250                 }
 251         }
 252
 253         status = acpi_get_table_by_index(table_index, &table);
 254         if (ACPI_SUCCESS(status)) {
 255                 ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:"));
 256                 acpi_tb_print_table_header(0, table);
 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         u64 value;
 290         u32 region_offset = 0;
 291         u32 i;
 292
 293         /* Bytewise reads */
 294
 295         for (i = 0; i < length; i++) {
 296                 status =
 297                     acpi_ev_address_space_dispatch(obj_desc, NULL, ACPI_READ,
 298                                                    region_offset, 8, &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_header;
 339         struct acpi_table_header *table;
 340         u32 table_index;
 341         acpi_status status;
 342         u32 length;
 343
 344         ACPI_FUNCTION_TRACE(ex_load_op);
 345
 346         /* Source Object can be either an op_region or a Buffer/Field */
 347
 348         switch (obj_desc->common.type) {
 349         case ACPI_TYPE_REGION:
 350
 351                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 352                                   "Load table from Region %p\n", obj_desc));
 353
 354                 /* Region must be system_memory (from ACPI spec) */
 355
 356                 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
 357                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 358                 }
 359
 360                 /*
 361                  * If the Region Address and Length have not been previously evaluated,
 362                  * evaluate them now and save the results.
 363                  */
 364                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 365                         status = acpi_ds_get_region_arguments(obj_desc);
 366                         if (ACPI_FAILURE(status)) {
 367                                 return_ACPI_STATUS(status);
 368                         }
 369                 }
 370
 371                 /* Get the table header first so we can get the table length */
 372
 373                 table_header = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
 374                 if (!table_header) {
 375                         return_ACPI_STATUS(AE_NO_MEMORY);
 376                 }
 377
 378                 status =
 379                     acpi_ex_region_read(obj_desc,
 380                                         sizeof(struct acpi_table_header),
 381                                         ACPI_CAST_PTR(u8, table_header));
 382                 length = table_header->length;
 383                 ACPI_FREE(table_header);
 384
 385                 if (ACPI_FAILURE(status)) {
 386                         return_ACPI_STATUS(status);
 387                 }
 388
 389                 /* Must have at least an ACPI table header */
 390
 391                 if (length < sizeof(struct acpi_table_header)) {
 392                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 393                 }
 394
 395                 /*
 396                  * The original implementation simply mapped the table, with no copy.
 397                  * However, the memory region is not guaranteed to remain stable and
 398                  * we must copy the table to a local buffer. For example, the memory
 399                  * region is corrupted after suspend on some machines. Dynamically
 400                  * loaded tables are usually small, so this overhead is minimal.
 401                  *
 402                  * The latest implementation (5/2009) does not use a mapping at all.
 403                  * We use the low-level operation region interface to read the table
 404                  * instead of the obvious optimization of using a direct mapping.
 405                  * This maintains a consistent use of operation regions across the
 406                  * entire subsystem. This is important if additional processing must
 407                  * be performed in the (possibly user-installed) operation region
 408                  * handler. For example, acpi_exec and ASLTS depend on this.
 409                  */
 410
 411                 /* Allocate a buffer for the table */
 412
 413                 table = ACPI_ALLOCATE(length);
 414                 if (!table) {
 415                         return_ACPI_STATUS(AE_NO_MEMORY);
 416                 }
 417
 418                 /* Read the entire table */
 419
 420                 status = acpi_ex_region_read(obj_desc, length,
 421                                              ACPI_CAST_PTR(u8, table));
 422                 if (ACPI_FAILURE(status)) {
 423                         ACPI_FREE(table);
 424                         return_ACPI_STATUS(status);
 425                 }
 426                 break;
 427
 428         case ACPI_TYPE_BUFFER:  /* Buffer or resolved region_field */
 429
 430                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 431                                   "Load table from Buffer or Field %p\n",
 432                                   obj_desc));
 433
 434                 /* Must have at least an ACPI table header */
 435
 436                 if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
 437                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 438                 }
 439
 440                 /* Get the actual table length from the table header */
 441
 442                 table_header =
 443                     ACPI_CAST_PTR(struct acpi_table_header,
 444                                   obj_desc->buffer.pointer);
 445                 length = table_header->length;
 446
 447                 /* Table cannot extend beyond the buffer */
 448
 449                 if (length > obj_desc->buffer.length) {
 450                         return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
 451                 }
 452                 if (length < sizeof(struct acpi_table_header)) {
 453                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 454                 }
 455
 456                 /*
 457                  * Copy the table from the buffer because the buffer could be modified
 458                  * or even deleted in the future
 459                  */
 460                 table = ACPI_ALLOCATE(length);
 461                 if (!table) {
 462                         return_ACPI_STATUS(AE_NO_MEMORY);
 463                 }
 464
 465                 memcpy(table, table_header, length);
 466                 break;
 467
 468         default:
 469
 470                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 471         }
 472
 473         /* Install the new table into the local data structures */
 474
 475         ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:"));
 476         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 477
 478         status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table),
 479                                                 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
 480                                                 TRUE, TRUE, &table_index);
 481
 482         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 483         if (ACPI_FAILURE(status)) {
 484
 485                 /* Delete allocated table buffer */
 486
 487                 ACPI_FREE(table);
 488                 return_ACPI_STATUS(status);
 489         }
 490
 491         /*
 492          * Note: Now table is "INSTALLED", it must be validated before
 493          * loading.
 494          */
 495         status =
 496             acpi_tb_validate_table(&acpi_gbl_root_table_list.
 497                                    tables[table_index]);
 498         if (ACPI_FAILURE(status)) {
 499                 return_ACPI_STATUS(status);
 500         }
 501
 502         /*
 503          * Add the table to the namespace.
 504          *
 505          * Note: Load the table objects relative to the root of the namespace.
 506          * This appears to go against the ACPI specification, but we do it for
 507          * compatibility with other ACPI implementations.
 508          */
 509         status =
 510             acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle);
 511         if (ACPI_FAILURE(status)) {
 512
 513                 /* On error, table_ptr was deallocated above */
 514
 515                 return_ACPI_STATUS(status);
 516         }
 517
 518         /* Store the ddb_handle into the Target operand */
 519
 520         status = acpi_ex_store(ddb_handle, target, walk_state);
 521         if (ACPI_FAILURE(status)) {
 522                 (void)acpi_ex_unload_table(ddb_handle);
 523
 524                 /* table_ptr was deallocated above */
 525
 526                 acpi_ut_remove_reference(ddb_handle);
 527                 return_ACPI_STATUS(status);
 528         }
 529
 530         /* Remove the reference by added by acpi_ex_store above */
 531
 532         acpi_ut_remove_reference(ddb_handle);
 533
 534         /* Invoke table handler if present */
 535
 536         if (acpi_gbl_table_handler) {
 537                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 538                                              acpi_gbl_table_handler_context);
 539         }
 540
 541         return_ACPI_STATUS(status);
 542 }
 543
 544 /*******************************************************************************
 545  *
 546  * FUNCTION:    acpi_ex_unload_table
 547  *
 548  * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 549  *
 550  * RETURN:      Status
 551  *
 552  * DESCRIPTION: Unload an ACPI table
 553  *
 554  ******************************************************************************/
 555
 556 acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 557 {
 558         acpi_status status = AE_OK;
 559         union acpi_operand_object *table_desc = ddb_handle;
 560         u32 table_index;
 561         struct acpi_table_header *table;
 562
 563         ACPI_FUNCTION_TRACE(ex_unload_table);
 564
 565         /*
 566          * Temporarily emit a warning so that the ASL for the machine can be
 567          * hopefully obtained. This is to say that the Unload() operator is
 568          * extremely rare if not completely unused.
 569          */
 570         ACPI_WARNING((AE_INFO, "Received request to unload an ACPI table"));
 571
 572         /*
 573          * Validate the handle
 574          * Although the handle is partially validated in acpi_ex_reconfiguration()
 575          * when it calls acpi_ex_resolve_operands(), the handle is more completely
 576          * validated here.
 577          *
 578          * Handle must be a valid operand object of type reference. Also, the
 579          * ddb_handle must still be marked valid (table has not been previously
 580          * unloaded)
 581          */
 582         if ((!ddb_handle) ||
 583             (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
 584             (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
 585             (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
 586                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 587         }
 588
 589         /* Get the table index from the ddb_handle */
 590
 591         table_index = table_desc->reference.value;
 592
 593         /* Ensure the table is still loaded */
 594
 595         if (!acpi_tb_is_table_loaded(table_index)) {
 596                 return_ACPI_STATUS(AE_NOT_EXIST);
 597         }
 598
 599         /* Invoke table handler if present */
 600
 601         if (acpi_gbl_table_handler) {
 602                 status = acpi_get_table_by_index(table_index, &table);
 603                 if (ACPI_SUCCESS(status)) {
 604                         (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
 605                                                      table,
 606                                                      acpi_gbl_table_handler_context);
 607                 }
 608         }
 609
 610         /* Delete the portion of the namespace owned by this table */
 611
 612         status = acpi_tb_delete_namespace_by_owner(table_index);
 613         if (ACPI_FAILURE(status)) {
 614                 return_ACPI_STATUS(status);
 615         }
 616
 617         (void)acpi_tb_release_owner_id(table_index);
 618         acpi_tb_set_table_loaded_flag(table_index, FALSE);
 619
 620         /*
 621          * Invalidate the handle. We do this because the handle may be stored
 622          * in a named object and may not be actually deleted until much later.
 623          */
 624         ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
 625         return_ACPI_STATUS(AE_OK);
 626 }