drivers/acpi/acpica/exconfig.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, 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, union acpi_operand_object **ddb_handle);
  59
  60 static acpi_status
  61 acpi_ex_region_read(union acpi_operand_object *obj_desc,
  62                     u32 length, u8 *buffer);
  63
  64 /*******************************************************************************
  65  *
  66  * FUNCTION:    acpi_ex_add_table
  67  *
  68  * PARAMETERS:  table               - Pointer to raw table
  69  *              parent_node         - Where to load the table (scope)
  70  *              ddb_handle          - Where to return the table handle.
  71  *
  72  * RETURN:      Status
  73  *
  74  * DESCRIPTION: Common function to Install and Load an ACPI table with a
  75  *              returned table handle.
  76  *
  77  ******************************************************************************/
  78
  79 static acpi_status
  80 acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle)
  81 {
  82         union acpi_operand_object *obj_desc;
  83
  84         ACPI_FUNCTION_TRACE(ex_add_table);
  85
  86         /* Create an object to be the table handle */
  87
  88         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
  89         if (!obj_desc) {
  90                 return_ACPI_STATUS(AE_NO_MEMORY);
  91         }
  92
  93         /* Init the table handle */
  94
  95         obj_desc->common.flags |= AOPOBJ_DATA_VALID;
  96         obj_desc->reference.class = ACPI_REFCLASS_TABLE;
  97         obj_desc->reference.value = table_index;
  98         *ddb_handle = obj_desc;
  99         return_ACPI_STATUS(AE_OK);
 100 }
 101
 102 /*******************************************************************************
 103  *
 104  * FUNCTION:    acpi_ex_load_table_op
 105  *
 106  * PARAMETERS:  walk_state          - Current state with operands
 107  *              return_desc         - Where to store the return object
 108  *
 109  * RETURN:      Status
 110  *
 111  * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
 112  *
 113  ******************************************************************************/
 114
 115 acpi_status
 116 acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
 117                       union acpi_operand_object **return_desc)
 118 {
 119         acpi_status status;
 120         union acpi_operand_object **operand = &walk_state->operands[0];
 121         struct acpi_namespace_node *parent_node;
 122         struct acpi_namespace_node *start_node;
 123         struct acpi_namespace_node *parameter_node = NULL;
 124         union acpi_operand_object *ddb_handle;
 125         u32 table_index;
 126
 127         ACPI_FUNCTION_TRACE(ex_load_table_op);
 128
 129         /* Find the ACPI table in the RSDT/XSDT */
 130
 131         acpi_ex_exit_interpreter();
 132         status = acpi_tb_find_table(operand[0]->string.pointer,
 133                                     operand[1]->string.pointer,
 134                                     operand[2]->string.pointer, &table_index);
 135         acpi_ex_enter_interpreter();
 136         if (ACPI_FAILURE(status)) {
 137                 if (status != AE_NOT_FOUND) {
 138                         return_ACPI_STATUS(status);
 139                 }
 140
 141                 /* Table not found, return an Integer=0 and AE_OK */
 142
 143                 ddb_handle = acpi_ut_create_integer_object((u64) 0);
 144                 if (!ddb_handle) {
 145                         return_ACPI_STATUS(AE_NO_MEMORY);
 146                 }
 147
 148                 *return_desc = ddb_handle;
 149                 return_ACPI_STATUS(AE_OK);
 150         }
 151
 152         /* Default nodes */
 153
 154         start_node = walk_state->scope_info->scope.node;
 155         parent_node = acpi_gbl_root_node;
 156
 157         /* root_path (optional parameter) */
 158
 159         if (operand[3]->string.length > 0) {
 160                 /*
 161                  * Find the node referenced by the root_path_string. This is the
 162                  * location within the namespace where the table will be loaded.
 163                  */
 164                 status = acpi_ns_get_node_unlocked(start_node,
 165                                                    operand[3]->string.pointer,
 166                                                    ACPI_NS_SEARCH_PARENT,
 167                                                    &parent_node);
 168                 if (ACPI_FAILURE(status)) {
 169                         return_ACPI_STATUS(status);
 170                 }
 171         }
 172
 173         /* parameter_path (optional parameter) */
 174
 175         if (operand[4]->string.length > 0) {
 176                 if ((operand[4]->string.pointer[0] != AML_ROOT_PREFIX) &&
 177                     (operand[4]->string.pointer[0] != AML_PARENT_PREFIX)) {
 178                         /*
 179                          * Path is not absolute, so it will be relative to the node
 180                          * referenced by the root_path_string (or the NS root if omitted)
 181                          */
 182                         start_node = parent_node;
 183                 }
 184
 185                 /* Find the node referenced by the parameter_path_string */
 186
 187                 status = acpi_ns_get_node_unlocked(start_node,
 188                                                    operand[4]->string.pointer,
 189                                                    ACPI_NS_SEARCH_PARENT,
 190                                                    &parameter_node);
 191                 if (ACPI_FAILURE(status)) {
 192                         return_ACPI_STATUS(status);
 193                 }
 194         }
 195
 196         /* Load the table into the namespace */
 197
 198         ACPI_INFO(("Dynamic OEM Table Load:"));
 199         acpi_ex_exit_interpreter();
 200         status = acpi_tb_load_table(table_index, parent_node);
 201         acpi_ex_enter_interpreter();
 202         if (ACPI_FAILURE(status)) {
 203                 return_ACPI_STATUS(status);
 204         }
 205
 206         status = acpi_ex_add_table(table_index, &ddb_handle);
 207         if (ACPI_FAILURE(status)) {
 208                 return_ACPI_STATUS(status);
 209         }
 210
 211         /* Parameter Data (optional) */
 212
 213         if (parameter_node) {
 214
 215                 /* Store the parameter data into the optional parameter object */
 216
 217                 status = acpi_ex_store(operand[5],
 218                                        ACPI_CAST_PTR(union acpi_operand_object,
 219                                                      parameter_node),
 220                                        walk_state);
 221                 if (ACPI_FAILURE(status)) {
 222                         (void)acpi_ex_unload_table(ddb_handle);
 223
 224                         acpi_ut_remove_reference(ddb_handle);
 225                         return_ACPI_STATUS(status);
 226                 }
 227         }
 228
 229         *return_desc = ddb_handle;
 230         return_ACPI_STATUS(status);
 231 }
 232
 233 /*******************************************************************************
 234  *
 235  * FUNCTION:    acpi_ex_region_read
 236  *
 237  * PARAMETERS:  obj_desc        - Region descriptor
 238  *              length          - Number of bytes to read
 239  *              buffer          - Pointer to where to put the data
 240  *
 241  * RETURN:      Status
 242  *
 243  * DESCRIPTION: Read data from an operation region. The read starts from the
 244  *              beginning of the region.
 245  *
 246  ******************************************************************************/
 247
 248 static acpi_status
 249 acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer)
 250 {
 251         acpi_status status;
 252         u64 value;
 253         u32 region_offset = 0;
 254         u32 i;
 255
 256         /* Bytewise reads */
 257
 258         for (i = 0; i < length; i++) {
 259                 status =
 260                     acpi_ev_address_space_dispatch(obj_desc, NULL, ACPI_READ,
 261                                                    region_offset, 8, &value);
 262                 if (ACPI_FAILURE(status)) {
 263                         return (status);
 264                 }
 265
 266                 *buffer = (u8)value;
 267                 buffer++;
 268                 region_offset++;
 269         }
 270
 271         return (AE_OK);
 272 }
 273
 274 /*******************************************************************************
 275  *
 276  * FUNCTION:    acpi_ex_load_op
 277  *
 278  * PARAMETERS:  obj_desc        - Region or Buffer/Field where the table will be
 279  *                                obtained
 280  *              target          - Where a handle to the table will be stored
 281  *              walk_state      - Current state
 282  *
 283  * RETURN:      Status
 284  *
 285  * DESCRIPTION: Load an ACPI table from a field or operation region
 286  *
 287  * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
 288  *       objects before this code is reached.
 289  *
 290  *       If source is an operation region, it must refer to system_memory, as
 291  *       per the ACPI specification.
 292  *
 293  ******************************************************************************/
 294
 295 acpi_status
 296 acpi_ex_load_op(union acpi_operand_object *obj_desc,
 297                 union acpi_operand_object *target,
 298                 struct acpi_walk_state *walk_state)
 299 {
 300         union acpi_operand_object *ddb_handle;
 301         struct acpi_table_header *table_header;
 302         struct acpi_table_header *table;
 303         u32 table_index;
 304         acpi_status status;
 305         u32 length;
 306
 307         ACPI_FUNCTION_TRACE(ex_load_op);
 308
 309         /* Source Object can be either an op_region or a Buffer/Field */
 310
 311         switch (obj_desc->common.type) {
 312         case ACPI_TYPE_REGION:
 313
 314                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 315                                   "Load table from Region %p\n", obj_desc));
 316
 317                 /* Region must be system_memory (from ACPI spec) */
 318
 319                 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
 320                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 321                 }
 322
 323                 /*
 324                  * If the Region Address and Length have not been previously
 325                  * evaluated, evaluate them now and save the results.
 326                  */
 327                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 328                         status = acpi_ds_get_region_arguments(obj_desc);
 329                         if (ACPI_FAILURE(status)) {
 330                                 return_ACPI_STATUS(status);
 331                         }
 332                 }
 333
 334                 /* Get the table header first so we can get the table length */
 335
 336                 table_header = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
 337                 if (!table_header) {
 338                         return_ACPI_STATUS(AE_NO_MEMORY);
 339                 }
 340
 341                 status =
 342                     acpi_ex_region_read(obj_desc,
 343                                         sizeof(struct acpi_table_header),
 344                                         ACPI_CAST_PTR(u8, table_header));
 345                 length = table_header->length;
 346                 ACPI_FREE(table_header);
 347
 348                 if (ACPI_FAILURE(status)) {
 349                         return_ACPI_STATUS(status);
 350                 }
 351
 352                 /* Must have at least an ACPI table header */
 353
 354                 if (length < sizeof(struct acpi_table_header)) {
 355                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 356                 }
 357
 358                 /*
 359                  * The original implementation simply mapped the table, with no copy.
 360                  * However, the memory region is not guaranteed to remain stable and
 361                  * we must copy the table to a local buffer. For example, the memory
 362                  * region is corrupted after suspend on some machines. Dynamically
 363                  * loaded tables are usually small, so this overhead is minimal.
 364                  *
 365                  * The latest implementation (5/2009) does not use a mapping at all.
 366                  * We use the low-level operation region interface to read the table
 367                  * instead of the obvious optimization of using a direct mapping.
 368                  * This maintains a consistent use of operation regions across the
 369                  * entire subsystem. This is important if additional processing must
 370                  * be performed in the (possibly user-installed) operation region
 371                  * handler. For example, acpi_exec and ASLTS depend on this.
 372                  */
 373
 374                 /* Allocate a buffer for the table */
 375
 376                 table = ACPI_ALLOCATE(length);
 377                 if (!table) {
 378                         return_ACPI_STATUS(AE_NO_MEMORY);
 379                 }
 380
 381                 /* Read the entire table */
 382
 383                 status = acpi_ex_region_read(obj_desc, length,
 384                                              ACPI_CAST_PTR(u8, table));
 385                 if (ACPI_FAILURE(status)) {
 386                         ACPI_FREE(table);
 387                         return_ACPI_STATUS(status);
 388                 }
 389                 break;
 390
 391         case ACPI_TYPE_BUFFER:  /* Buffer or resolved region_field */
 392
 393                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 394                                   "Load table from Buffer or Field %p\n",
 395                                   obj_desc));
 396
 397                 /* Must have at least an ACPI table header */
 398
 399                 if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
 400                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 401                 }
 402
 403                 /* Get the actual table length from the table header */
 404
 405                 table_header =
 406                     ACPI_CAST_PTR(struct acpi_table_header,
 407                                   obj_desc->buffer.pointer);
 408                 length = table_header->length;
 409
 410                 /* Table cannot extend beyond the buffer */
 411
 412                 if (length > obj_desc->buffer.length) {
 413                         return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
 414                 }
 415                 if (length < sizeof(struct acpi_table_header)) {
 416                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 417                 }
 418
 419                 /*
 420                  * Copy the table from the buffer because the buffer could be
 421                  * modified or even deleted in the future
 422                  */
 423                 table = ACPI_ALLOCATE(length);
 424                 if (!table) {
 425                         return_ACPI_STATUS(AE_NO_MEMORY);
 426                 }
 427
 428                 memcpy(table, table_header, length);
 429                 break;
 430
 431         default:
 432
 433                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 434         }
 435
 436         /* Install the new table into the local data structures */
 437
 438         ACPI_INFO(("Dynamic OEM Table Load:"));
 439         acpi_ex_exit_interpreter();
 440         status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
 441                                                 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
 442                                                 TRUE, &table_index);
 443         acpi_ex_enter_interpreter();
 444         if (ACPI_FAILURE(status)) {
 445
 446                 /* Delete allocated table buffer */
 447
 448                 ACPI_FREE(table);
 449                 return_ACPI_STATUS(status);
 450         }
 451
 452         /*
 453          * Add the table to the namespace.
 454          *
 455          * Note: Load the table objects relative to the root of the namespace.
 456          * This appears to go against the ACPI specification, but we do it for
 457          * compatibility with other ACPI implementations.
 458          */
 459         status = acpi_ex_add_table(table_index, &ddb_handle);
 460         if (ACPI_FAILURE(status)) {
 461
 462                 /* On error, table_ptr was deallocated above */
 463
 464                 return_ACPI_STATUS(status);
 465         }
 466
 467         /* Store the ddb_handle into the Target operand */
 468
 469         status = acpi_ex_store(ddb_handle, target, walk_state);
 470         if (ACPI_FAILURE(status)) {
 471                 (void)acpi_ex_unload_table(ddb_handle);
 472
 473                 /* table_ptr was deallocated above */
 474
 475                 acpi_ut_remove_reference(ddb_handle);
 476                 return_ACPI_STATUS(status);
 477         }
 478
 479         /* Remove the reference by added by acpi_ex_store above */
 480
 481         acpi_ut_remove_reference(ddb_handle);
 482         return_ACPI_STATUS(status);
 483 }
 484
 485 /*******************************************************************************
 486  *
 487  * FUNCTION:    acpi_ex_unload_table
 488  *
 489  * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 490  *
 491  * RETURN:      Status
 492  *
 493  * DESCRIPTION: Unload an ACPI table
 494  *
 495  ******************************************************************************/
 496
 497 acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 498 {
 499         acpi_status status = AE_OK;
 500         union acpi_operand_object *table_desc = ddb_handle;
 501         u32 table_index;
 502
 503         ACPI_FUNCTION_TRACE(ex_unload_table);
 504
 505         /*
 506          * Temporarily emit a warning so that the ASL for the machine can be
 507          * hopefully obtained. This is to say that the Unload() operator is
 508          * extremely rare if not completely unused.
 509          */
 510         ACPI_WARNING((AE_INFO, "Received request to unload an ACPI table"));
 511
 512         /*
 513          * Validate the handle
 514          * Although the handle is partially validated in acpi_ex_reconfiguration()
 515          * when it calls acpi_ex_resolve_operands(), the handle is more completely
 516          * validated here.
 517          *
 518          * Handle must be a valid operand object of type reference. Also, the
 519          * ddb_handle must still be marked valid (table has not been previously
 520          * unloaded)
 521          */
 522         if ((!ddb_handle) ||
 523             (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
 524             (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
 525             (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
 526                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 527         }
 528
 529         /* Get the table index from the ddb_handle */
 530
 531         table_index = table_desc->reference.value;
 532
 533         /*
 534          * Release the interpreter lock so that the table lock won't have
 535          * strict order requirement against it.
 536          */
 537         acpi_ex_exit_interpreter();
 538         status = acpi_tb_unload_table(table_index);
 539         acpi_ex_enter_interpreter();
 540
 541         /*
 542          * Invalidate the handle. We do this because the handle may be stored
 543          * in a named object and may not be actually deleted until much later.
 544          */
 545         if (ACPI_SUCCESS(status)) {
 546                 ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
 547         }
 548         return_ACPI_STATUS(status);
 549 }