drivers/acpi/acpica/dswload2.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: dswload2 - Dispatcher second pass namespace load callbacks
   5  *
   6  * Copyright (C) 2000 - 2020, Intel Corp.
   7  *
   8  *****************************************************************************/
   9
  10 #include <acpi/acpi.h>
  11 #include "accommon.h"
  12 #include "acparser.h"
  13 #include "amlcode.h"
  14 #include "acdispat.h"
  15 #include "acinterp.h"
  16 #include "acnamesp.h"
  17 #include "acevents.h"
  18
  19 #define _COMPONENT          ACPI_DISPATCHER
  20 ACPI_MODULE_NAME("dswload2")
  21
  22 /*******************************************************************************
  23  *
  24  * FUNCTION:    acpi_ds_load2_begin_op
  25  *
  26  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  27  *              out_op          - Where to return op if a new one is created
  28  *
  29  * RETURN:      Status
  30  *
  31  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
  32  *
  33  ******************************************************************************/
  34 acpi_status
  35 acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
  36                        union acpi_parse_object **out_op)
  37 {
  38         union acpi_parse_object *op;
  39         struct acpi_namespace_node *node;
  40         acpi_status status;
  41         acpi_object_type object_type;
  42         char *buffer_ptr;
  43         u32 flags;
  44
  45         ACPI_FUNCTION_TRACE(ds_load2_begin_op);
  46
  47         op = walk_state->op;
  48         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
  49                           walk_state));
  50
  51         if (op) {
  52                 if ((walk_state->control_state) &&
  53                     (walk_state->control_state->common.state ==
  54                      ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
  55
  56                         /* We are executing a while loop outside of a method */
  57
  58                         status = acpi_ds_exec_begin_op(walk_state, out_op);
  59                         return_ACPI_STATUS(status);
  60                 }
  61
  62                 /* We only care about Namespace opcodes here */
  63
  64                 if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
  65                      (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
  66                     (!(walk_state->op_info->flags & AML_NAMED))) {
  67                         return_ACPI_STATUS(AE_OK);
  68                 }
  69
  70                 /* Get the name we are going to enter or lookup in the namespace */
  71
  72                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
  73
  74                         /* For Namepath op, get the path string */
  75
  76                         buffer_ptr = op->common.value.string;
  77                         if (!buffer_ptr) {
  78
  79                                 /* No name, just exit */
  80
  81                                 return_ACPI_STATUS(AE_OK);
  82                         }
  83                 } else {
  84                         /* Get name from the op */
  85
  86                         buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
  87                 }
  88         } else {
  89                 /* Get the namestring from the raw AML */
  90
  91                 buffer_ptr =
  92                     acpi_ps_get_next_namestring(&walk_state->parser_state);
  93         }
  94
  95         /* Map the opcode into an internal object type */
  96
  97         object_type = walk_state->op_info->object_type;
  98
  99         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 100                           "State=%p Op=%p Type=%X\n", walk_state, op,
 101                           object_type));
 102
 103         switch (walk_state->opcode) {
 104         case AML_FIELD_OP:
 105         case AML_BANK_FIELD_OP:
 106         case AML_INDEX_FIELD_OP:
 107
 108                 node = NULL;
 109                 status = AE_OK;
 110                 break;
 111
 112         case AML_INT_NAMEPATH_OP:
 113                 /*
 114                  * The name_path is an object reference to an existing object.
 115                  * Don't enter the name into the namespace, but look it up
 116                  * for use later.
 117                  */
 118                 status =
 119                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 120                                    object_type, ACPI_IMODE_EXECUTE,
 121                                    ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 122                 break;
 123
 124         case AML_SCOPE_OP:
 125
 126                 /* Special case for Scope(\) -> refers to the Root node */
 127
 128                 if (op && (op->named.node == acpi_gbl_root_node)) {
 129                         node = op->named.node;
 130
 131                         status =
 132                             acpi_ds_scope_stack_push(node, object_type,
 133                                                      walk_state);
 134                         if (ACPI_FAILURE(status)) {
 135                                 return_ACPI_STATUS(status);
 136                         }
 137                 } else {
 138                         /*
 139                          * The Path is an object reference to an existing object.
 140                          * Don't enter the name into the namespace, but look it up
 141                          * for use later.
 142                          */
 143                         status =
 144                             acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 145                                            object_type, ACPI_IMODE_EXECUTE,
 146                                            ACPI_NS_SEARCH_PARENT, walk_state,
 147                                            &(node));
 148                         if (ACPI_FAILURE(status)) {
 149 #ifdef ACPI_ASL_COMPILER
 150                                 if (status == AE_NOT_FOUND) {
 151                                         status = AE_OK;
 152                                 } else {
 153                                         ACPI_ERROR_NAMESPACE(walk_state->
 154                                                              scope_info,
 155                                                              buffer_ptr,
 156                                                              status);
 157                                 }
 158 #else
 159                                 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 160                                                      buffer_ptr, status);
 161 #endif
 162                                 return_ACPI_STATUS(status);
 163                         }
 164                 }
 165
 166                 /*
 167                  * We must check to make sure that the target is
 168                  * one of the opcodes that actually opens a scope
 169                  */
 170                 switch (node->type) {
 171                 case ACPI_TYPE_ANY:
 172                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope */
 173                 case ACPI_TYPE_DEVICE:
 174                 case ACPI_TYPE_POWER:
 175                 case ACPI_TYPE_PROCESSOR:
 176                 case ACPI_TYPE_THERMAL:
 177
 178                         /* These are acceptable types */
 179                         break;
 180
 181                 case ACPI_TYPE_INTEGER:
 182                 case ACPI_TYPE_STRING:
 183                 case ACPI_TYPE_BUFFER:
 184
 185                         /*
 186                          * These types we will allow, but we will change the type.
 187                          * This enables some existing code of the form:
 188                          *
 189                          *  Name (DEB, 0)
 190                          *  Scope (DEB) { ... }
 191                          */
 192                         ACPI_WARNING((AE_INFO,
 193                                       "Type override - [%4.4s] had invalid type (%s) "
 194                                       "for Scope operator, changed to type ANY",
 195                                       acpi_ut_get_node_name(node),
 196                                       acpi_ut_get_type_name(node->type)));
 197
 198                         node->type = ACPI_TYPE_ANY;
 199                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 200                         break;
 201
 202                 case ACPI_TYPE_METHOD:
 203
 204                         /*
 205                          * Allow scope change to root during execution of module-level
 206                          * code. Root is typed METHOD during this time.
 207                          */
 208                         if ((node == acpi_gbl_root_node) &&
 209                             (walk_state->
 210                              parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 211                                 break;
 212                         }
 213
 214                         /*lint -fallthrough */
 215
 216                 default:
 217
 218                         /* All other types are an error */
 219
 220                         ACPI_ERROR((AE_INFO,
 221                                     "Invalid type (%s) for target of "
 222                                     "Scope operator [%4.4s] (Cannot override)",
 223                                     acpi_ut_get_type_name(node->type),
 224                                     acpi_ut_get_node_name(node)));
 225
 226                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 227                 }
 228                 break;
 229
 230         default:
 231
 232                 /* All other opcodes */
 233
 234                 if (op && op->common.node) {
 235
 236                         /* This op/node was previously entered into the namespace */
 237
 238                         node = op->common.node;
 239
 240                         if (acpi_ns_opens_scope(object_type)) {
 241                                 status =
 242                                     acpi_ds_scope_stack_push(node, object_type,
 243                                                              walk_state);
 244                                 if (ACPI_FAILURE(status)) {
 245                                         return_ACPI_STATUS(status);
 246                                 }
 247                         }
 248
 249                         return_ACPI_STATUS(AE_OK);
 250                 }
 251
 252                 /*
 253                  * Enter the named type into the internal namespace. We enter the name
 254                  * as we go downward in the parse tree. Any necessary subobjects that
 255                  * involve arguments to the opcode must be created as we go back up the
 256                  * parse tree later.
 257                  *
 258                  * Note: Name may already exist if we are executing a deferred opcode.
 259                  */
 260                 if (walk_state->deferred_node) {
 261
 262                         /* This name is already in the namespace, get the node */
 263
 264                         node = walk_state->deferred_node;
 265                         status = AE_OK;
 266                         break;
 267                 }
 268
 269                 flags = ACPI_NS_NO_UPSEARCH;
 270                 if (walk_state->pass_number == ACPI_IMODE_EXECUTE) {
 271
 272                         /* Execution mode, node cannot already exist, node is temporary */
 273
 274                         flags |= ACPI_NS_ERROR_IF_FOUND;
 275
 276                         if (!
 277                             (walk_state->
 278                              parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 279                                 flags |= ACPI_NS_TEMPORARY;
 280                         }
 281                 }
 282 #ifdef ACPI_ASL_COMPILER
 283
 284                 /*
 285                  * Do not open a scope for AML_EXTERNAL_OP
 286                  * acpi_ns_lookup can open a new scope based on the object type
 287                  * of this op. AML_EXTERNAL_OP is a declaration rather than a
 288                  * definition. In the case that this external is a method object,
 289                  * acpi_ns_lookup will open a new scope. However, an AML_EXTERNAL_OP
 290                  * associated with the ACPI_TYPE_METHOD is a declaration, rather than
 291                  * a definition. Flags is set to avoid opening a scope for any
 292                  * AML_EXTERNAL_OP.
 293                  */
 294                 if (walk_state->opcode == AML_EXTERNAL_OP) {
 295                         flags |= ACPI_NS_DONT_OPEN_SCOPE;
 296                 }
 297 #endif
 298
 299                 /*
 300                  * For name creation opcodes, the full namepath prefix must
 301                  * exist, except for the final (new) nameseg.
 302                  */
 303                 if (walk_state->op_info->flags & AML_NAMED) {
 304                         flags |= ACPI_NS_PREFIX_MUST_EXIST;
 305                 }
 306
 307                 /* Add new entry or lookup existing entry */
 308
 309                 status =
 310                     acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 311                                    object_type, ACPI_IMODE_LOAD_PASS2, flags,
 312                                    walk_state, &node);
 313
 314                 if (ACPI_SUCCESS(status) && (flags & ACPI_NS_TEMPORARY)) {
 315                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 316                                           "***New Node [%4.4s] %p is temporary\n",
 317                                           acpi_ut_get_node_name(node), node));
 318                 }
 319                 break;
 320         }
 321
 322         if (ACPI_FAILURE(status)) {
 323                 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 324                                      buffer_ptr, status);
 325                 return_ACPI_STATUS(status);
 326         }
 327
 328         if (!op) {
 329
 330                 /* Create a new op */
 331
 332                 op = acpi_ps_alloc_op(walk_state->opcode, walk_state->aml);
 333                 if (!op) {
 334                         return_ACPI_STATUS(AE_NO_MEMORY);
 335                 }
 336
 337                 /* Initialize the new op */
 338
 339                 if (node) {
 340                         op->named.name = node->name.integer;
 341                 }
 342                 *out_op = op;
 343         }
 344
 345         /*
 346          * Put the Node in the "op" object that the parser uses, so we
 347          * can get it again quickly when this scope is closed
 348          */
 349         op->common.node = node;
 350         return_ACPI_STATUS(status);
 351 }
 352
 353 /*******************************************************************************
 354  *
 355  * FUNCTION:    acpi_ds_load2_end_op
 356  *
 357  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 358  *
 359  * RETURN:      Status
 360  *
 361  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 362  *              both control methods and everything else.
 363  *
 364  ******************************************************************************/
 365
 366 acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 367 {
 368         union acpi_parse_object *op;
 369         acpi_status status = AE_OK;
 370         acpi_object_type object_type;
 371         struct acpi_namespace_node *node;
 372         union acpi_parse_object *arg;
 373         struct acpi_namespace_node *new_node;
 374         u32 i;
 375         u8 region_space;
 376
 377         ACPI_FUNCTION_TRACE(ds_load2_end_op);
 378
 379         op = walk_state->op;
 380         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
 381                           walk_state->op_info->name, op, walk_state));
 382
 383         /* Check if opcode had an associated namespace object */
 384
 385         if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
 386                 return_ACPI_STATUS(AE_OK);
 387         }
 388
 389         if (op->common.aml_opcode == AML_SCOPE_OP) {
 390                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 391                                   "Ending scope Op=%p State=%p\n", op,
 392                                   walk_state));
 393         }
 394
 395         object_type = walk_state->op_info->object_type;
 396
 397         /*
 398          * Get the Node/name from the earlier lookup
 399          * (It was saved in the *op structure)
 400          */
 401         node = op->common.node;
 402
 403         /*
 404          * Put the Node on the object stack (Contains the ACPI Name of
 405          * this object)
 406          */
 407         walk_state->operands[0] = (void *)node;
 408         walk_state->num_operands = 1;
 409
 410         /* Pop the scope stack */
 411
 412         if (acpi_ns_opens_scope(object_type) &&
 413             (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
 414                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 415                                   "(%s) Popping scope for Op %p\n",
 416                                   acpi_ut_get_type_name(object_type), op));
 417
 418                 status = acpi_ds_scope_stack_pop(walk_state);
 419                 if (ACPI_FAILURE(status)) {
 420                         goto cleanup;
 421                 }
 422         }
 423
 424         /*
 425          * Named operations are as follows:
 426          *
 427          * AML_ALIAS
 428          * AML_BANKFIELD
 429          * AML_CREATEBITFIELD
 430          * AML_CREATEBYTEFIELD
 431          * AML_CREATEDWORDFIELD
 432          * AML_CREATEFIELD
 433          * AML_CREATEQWORDFIELD
 434          * AML_CREATEWORDFIELD
 435          * AML_DATA_REGION
 436          * AML_DEVICE
 437          * AML_EVENT
 438          * AML_FIELD
 439          * AML_INDEXFIELD
 440          * AML_METHOD
 441          * AML_METHODCALL
 442          * AML_MUTEX
 443          * AML_NAME
 444          * AML_NAMEDFIELD
 445          * AML_OPREGION
 446          * AML_POWERRES
 447          * AML_PROCESSOR
 448          * AML_SCOPE
 449          * AML_THERMALZONE
 450          */
 451
 452         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 453                           "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
 454                           acpi_ps_get_opcode_name(op->common.aml_opcode),
 455                           walk_state, op, node));
 456
 457         /* Decode the opcode */
 458
 459         arg = op->common.value.arg;
 460
 461         switch (walk_state->op_info->type) {
 462
 463         case AML_TYPE_CREATE_FIELD:
 464                 /*
 465                  * Create the field object, but the field buffer and index must
 466                  * be evaluated later during the execution phase
 467                  */
 468                 status = acpi_ds_create_buffer_field(op, walk_state);
 469                 break;
 470
 471         case AML_TYPE_NAMED_FIELD:
 472                 /*
 473                  * If we are executing a method, initialize the field
 474                  */
 475                 if (walk_state->method_node) {
 476                         status = acpi_ds_init_field_objects(op, walk_state);
 477                 }
 478
 479                 switch (op->common.aml_opcode) {
 480                 case AML_INDEX_FIELD_OP:
 481
 482                         status =
 483                             acpi_ds_create_index_field(op,
 484                                                        (acpi_handle)arg->common.
 485                                                        node, walk_state);
 486                         break;
 487
 488                 case AML_BANK_FIELD_OP:
 489
 490                         status =
 491                             acpi_ds_create_bank_field(op, arg->common.node,
 492                                                       walk_state);
 493                         break;
 494
 495                 case AML_FIELD_OP:
 496
 497                         status =
 498                             acpi_ds_create_field(op, arg->common.node,
 499                                                  walk_state);
 500                         break;
 501
 502                 default:
 503
 504                         /* All NAMED_FIELD opcodes must be handled above */
 505                         break;
 506                 }
 507                 break;
 508
 509         case AML_TYPE_NAMED_SIMPLE:
 510
 511                 status = acpi_ds_create_operands(walk_state, arg);
 512                 if (ACPI_FAILURE(status)) {
 513                         goto cleanup;
 514                 }
 515
 516                 switch (op->common.aml_opcode) {
 517                 case AML_PROCESSOR_OP:
 518
 519                         status = acpi_ex_create_processor(walk_state);
 520                         break;
 521
 522                 case AML_POWER_RESOURCE_OP:
 523
 524                         status = acpi_ex_create_power_resource(walk_state);
 525                         break;
 526
 527                 case AML_MUTEX_OP:
 528
 529                         status = acpi_ex_create_mutex(walk_state);
 530                         break;
 531
 532                 case AML_EVENT_OP:
 533
 534                         status = acpi_ex_create_event(walk_state);
 535                         break;
 536
 537                 case AML_ALIAS_OP:
 538
 539                         status = acpi_ex_create_alias(walk_state);
 540                         break;
 541
 542                 default:
 543
 544                         /* Unknown opcode */
 545
 546                         status = AE_OK;
 547                         goto cleanup;
 548                 }
 549
 550                 /* Delete operands */
 551
 552                 for (i = 1; i < walk_state->num_operands; i++) {
 553                         acpi_ut_remove_reference(walk_state->operands[i]);
 554                         walk_state->operands[i] = NULL;
 555                 }
 556
 557                 break;
 558
 559         case AML_TYPE_NAMED_COMPLEX:
 560
 561                 switch (op->common.aml_opcode) {
 562                 case AML_REGION_OP:
 563                 case AML_DATA_REGION_OP:
 564
 565                         if (op->common.aml_opcode == AML_REGION_OP) {
 566                                 region_space = (acpi_adr_space_type)
 567                                     ((op->common.value.arg)->common.value.
 568                                      integer);
 569                         } else {
 570                                 region_space = ACPI_ADR_SPACE_DATA_TABLE;
 571                         }
 572
 573                         /*
 574                          * The op_region is not fully parsed at this time. The only valid
 575                          * argument is the space_id. (We must save the address of the
 576                          * AML of the address and length operands)
 577                          *
 578                          * If we have a valid region, initialize it. The namespace is
 579                          * unlocked at this point.
 580                          *
 581                          * Need to unlock interpreter if it is locked (if we are running
 582                          * a control method), in order to allow _REG methods to be run
 583                          * during acpi_ev_initialize_region.
 584                          */
 585                         if (walk_state->method_node) {
 586                                 /*
 587                                  * Executing a method: initialize the region and unlock
 588                                  * the interpreter
 589                                  */
 590                                 status = acpi_ex_create_region(op->named.data,
 591                                                                op->named.length,
 592                                                                region_space,
 593                                                                walk_state);
 594                                 if (ACPI_FAILURE(status)) {
 595                                         return_ACPI_STATUS(status);
 596                                 }
 597                         }
 598
 599                         status =
 600                             acpi_ev_initialize_region
 601                             (acpi_ns_get_attached_object(node));
 602                         break;
 603
 604                 case AML_NAME_OP:
 605
 606                         status = acpi_ds_create_node(walk_state, node, op);
 607                         break;
 608
 609                 case AML_METHOD_OP:
 610                         /*
 611                          * method_op pkg_length name_string method_flags term_list
 612                          *
 613                          * Note: We must create the method node/object pair as soon as we
 614                          * see the method declaration. This allows later pass1 parsing
 615                          * of invocations of the method (need to know the number of
 616                          * arguments.)
 617                          */
 618                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 619                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 620                                           walk_state, op, op->named.node));
 621
 622                         if (!acpi_ns_get_attached_object(op->named.node)) {
 623                                 walk_state->operands[0] =
 624                                     ACPI_CAST_PTR(void, op->named.node);
 625                                 walk_state->num_operands = 1;
 626
 627                                 status =
 628                                     acpi_ds_create_operands(walk_state,
 629                                                             op->common.value.
 630                                                             arg);
 631                                 if (ACPI_SUCCESS(status)) {
 632                                         status =
 633                                             acpi_ex_create_method(op->named.
 634                                                                   data,
 635                                                                   op->named.
 636                                                                   length,
 637                                                                   walk_state);
 638                                 }
 639
 640                                 walk_state->operands[0] = NULL;
 641                                 walk_state->num_operands = 0;
 642
 643                                 if (ACPI_FAILURE(status)) {
 644                                         return_ACPI_STATUS(status);
 645                                 }
 646                         }
 647                         break;
 648
 649                 default:
 650
 651                         /* All NAMED_COMPLEX opcodes must be handled above */
 652                         break;
 653                 }
 654                 break;
 655
 656         case AML_CLASS_INTERNAL:
 657
 658                 /* case AML_INT_NAMEPATH_OP: */
 659                 break;
 660
 661         case AML_CLASS_METHOD_CALL:
 662
 663                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 664                                   "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
 665                                   walk_state, op, node));
 666
 667                 /*
 668                  * Lookup the method name and save the Node
 669                  */
 670                 status =
 671                     acpi_ns_lookup(walk_state->scope_info,
 672                                    arg->common.value.string, ACPI_TYPE_ANY,
 673                                    ACPI_IMODE_LOAD_PASS2,
 674                                    ACPI_NS_SEARCH_PARENT |
 675                                    ACPI_NS_DONT_OPEN_SCOPE, walk_state,
 676                                    &(new_node));
 677                 if (ACPI_SUCCESS(status)) {
 678                         /*
 679                          * Make sure that what we found is indeed a method
 680                          * We didn't search for a method on purpose, to see if the name
 681                          * would resolve
 682                          */
 683                         if (new_node->type != ACPI_TYPE_METHOD) {
 684                                 status = AE_AML_OPERAND_TYPE;
 685                         }
 686
 687                         /* We could put the returned object (Node) on the object stack for
 688                          * later, but for now, we will put it in the "op" object that the
 689                          * parser uses, so we can get it again at the end of this scope
 690                          */
 691                         op->common.node = new_node;
 692                 } else {
 693                         ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 694                                              arg->common.value.string, status);
 695                 }
 696                 break;
 697
 698         default:
 699
 700                 break;
 701         }
 702
 703 cleanup:
 704
 705         /* Remove the Node pushed at the very beginning */
 706
 707         walk_state->operands[0] = NULL;
 708         walk_state->num_operands = 0;
 709         return_ACPI_STATUS(status);
 710 }