drivers/acpi/acpica/dswload.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: dswload - Dispatcher first pass namespace load callbacks
   5  *
   6  * Copyright (C) 2000 - 2018, 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
  18 #ifdef ACPI_ASL_COMPILER
  19 #include "acdisasm.h"
  20 #endif
  21
  22 #define _COMPONENT          ACPI_DISPATCHER
  23 ACPI_MODULE_NAME("dswload")
  24
  25 /*******************************************************************************
  26  *
  27  * FUNCTION:    acpi_ds_init_callbacks
  28  *
  29  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  30  *              pass_number     - 1, 2, or 3
  31  *
  32  * RETURN:      Status
  33  *
  34  * DESCRIPTION: Init walk state callbacks
  35  *
  36  ******************************************************************************/
  37 acpi_status
  38 acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number)
  39 {
  40
  41         switch (pass_number) {
  42         case 0:
  43
  44                 /* Parse only - caller will setup callbacks */
  45
  46                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  47                     ACPI_PARSE_DELETE_TREE | ACPI_PARSE_DISASSEMBLE;
  48                 walk_state->descending_callback = NULL;
  49                 walk_state->ascending_callback = NULL;
  50                 break;
  51
  52         case 1:
  53
  54                 /* Load pass 1 */
  55
  56                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  57                     ACPI_PARSE_DELETE_TREE;
  58                 walk_state->descending_callback = acpi_ds_load1_begin_op;
  59                 walk_state->ascending_callback = acpi_ds_load1_end_op;
  60                 break;
  61
  62         case 2:
  63
  64                 /* Load pass 2 */
  65
  66                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  67                     ACPI_PARSE_DELETE_TREE;
  68                 walk_state->descending_callback = acpi_ds_load2_begin_op;
  69                 walk_state->ascending_callback = acpi_ds_load2_end_op;
  70                 break;
  71
  72         case 3:
  73
  74                 /* Execution pass */
  75
  76 #ifndef ACPI_NO_METHOD_EXECUTION
  77                 walk_state->parse_flags |= ACPI_PARSE_EXECUTE |
  78                     ACPI_PARSE_DELETE_TREE;
  79                 walk_state->descending_callback = acpi_ds_exec_begin_op;
  80                 walk_state->ascending_callback = acpi_ds_exec_end_op;
  81 #endif
  82                 break;
  83
  84         default:
  85
  86                 return (AE_BAD_PARAMETER);
  87         }
  88
  89         return (AE_OK);
  90 }
  91
  92 /*******************************************************************************
  93  *
  94  * FUNCTION:    acpi_ds_load1_begin_op
  95  *
  96  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  97  *              out_op          - Where to return op if a new one is created
  98  *
  99  * RETURN:      Status
 100  *
 101  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 102  *
 103  ******************************************************************************/
 104
 105 acpi_status
 106 acpi_ds_load1_begin_op(struct acpi_walk_state *walk_state,
 107                        union acpi_parse_object **out_op)
 108 {
 109         union acpi_parse_object *op;
 110         struct acpi_namespace_node *node;
 111         acpi_status status;
 112         acpi_object_type object_type;
 113         char *path;
 114         u32 flags;
 115
 116         ACPI_FUNCTION_TRACE_PTR(ds_load1_begin_op, walk_state->op);
 117
 118         op = walk_state->op;
 119         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 120                           walk_state));
 121
 122         /* We are only interested in opcodes that have an associated name */
 123
 124         if (op) {
 125                 if (!(walk_state->op_info->flags & AML_NAMED)) {
 126                         *out_op = op;
 127                         return_ACPI_STATUS(AE_OK);
 128                 }
 129
 130                 /* Check if this object has already been installed in the namespace */
 131
 132                 if (op->common.node) {
 133                         *out_op = op;
 134                         return_ACPI_STATUS(AE_OK);
 135                 }
 136         }
 137
 138         path = acpi_ps_get_next_namestring(&walk_state->parser_state);
 139
 140         /* Map the raw opcode into an internal object type */
 141
 142         object_type = walk_state->op_info->object_type;
 143
 144         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 145                           "State=%p Op=%p [%s]\n", walk_state, op,
 146                           acpi_ut_get_type_name(object_type)));
 147
 148         switch (walk_state->opcode) {
 149         case AML_SCOPE_OP:
 150                 /*
 151                  * The target name of the Scope() operator must exist at this point so
 152                  * that we can actually open the scope to enter new names underneath it.
 153                  * Allow search-to-root for single namesegs.
 154                  */
 155                 status =
 156                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 157                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 158                                    walk_state, &(node));
 159 #ifdef ACPI_ASL_COMPILER
 160                 if (status == AE_NOT_FOUND) {
 161                         /*
 162                          * Table disassembly:
 163                          * Target of Scope() not found. Generate an External for it, and
 164                          * insert the name into the namespace.
 165                          */
 166                         acpi_dm_add_op_to_external_list(op, path,
 167                                                         ACPI_TYPE_DEVICE, 0, 0);
 168                         status =
 169                             acpi_ns_lookup(walk_state->scope_info, path,
 170                                            object_type, ACPI_IMODE_LOAD_PASS1,
 171                                            ACPI_NS_SEARCH_PARENT, walk_state,
 172                                            &node);
 173                 }
 174 #endif
 175                 if (ACPI_FAILURE(status)) {
 176                         ACPI_ERROR_NAMESPACE(walk_state->scope_info, path,
 177                                              status);
 178                         return_ACPI_STATUS(status);
 179                 }
 180
 181                 /*
 182                  * Check to make sure that the target is
 183                  * one of the opcodes that actually opens a scope
 184                  */
 185                 switch (node->type) {
 186                 case ACPI_TYPE_ANY:
 187                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope  */
 188                 case ACPI_TYPE_DEVICE:
 189                 case ACPI_TYPE_POWER:
 190                 case ACPI_TYPE_PROCESSOR:
 191                 case ACPI_TYPE_THERMAL:
 192
 193                         /* These are acceptable types */
 194                         break;
 195
 196                 case ACPI_TYPE_INTEGER:
 197                 case ACPI_TYPE_STRING:
 198                 case ACPI_TYPE_BUFFER:
 199                         /*
 200                          * These types we will allow, but we will change the type.
 201                          * This enables some existing code of the form:
 202                          *
 203                          *  Name (DEB, 0)
 204                          *  Scope (DEB) { ... }
 205                          *
 206                          * Note: silently change the type here. On the second pass,
 207                          * we will report a warning
 208                          */
 209                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 210                                           "Type override - [%4.4s] had invalid type (%s) "
 211                                           "for Scope operator, changed to type ANY\n",
 212                                           acpi_ut_get_node_name(node),
 213                                           acpi_ut_get_type_name(node->type)));
 214
 215                         node->type = ACPI_TYPE_ANY;
 216                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 217                         break;
 218
 219                 case ACPI_TYPE_METHOD:
 220                         /*
 221                          * Allow scope change to root during execution of module-level
 222                          * code. Root is typed METHOD during this time.
 223                          */
 224                         if ((node == acpi_gbl_root_node) &&
 225                             (walk_state->
 226                              parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 227                                 break;
 228                         }
 229
 230                         /*lint -fallthrough */
 231
 232                 default:
 233
 234                         /* All other types are an error */
 235
 236                         ACPI_ERROR((AE_INFO,
 237                                     "Invalid type (%s) for target of "
 238                                     "Scope operator [%4.4s] (Cannot override)",
 239                                     acpi_ut_get_type_name(node->type),
 240                                     acpi_ut_get_node_name(node)));
 241
 242                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 243                 }
 244                 break;
 245
 246         default:
 247                 /*
 248                  * For all other named opcodes, we will enter the name into
 249                  * the namespace.
 250                  *
 251                  * Setup the search flags.
 252                  * Since we are entering a name into the namespace, we do not want to
 253                  * enable the search-to-root upsearch.
 254                  *
 255                  * There are only two conditions where it is acceptable that the name
 256                  * already exists:
 257                  *    1) the Scope() operator can reopen a scoping object that was
 258                  *       previously defined (Scope, Method, Device, etc.)
 259                  *    2) Whenever we are parsing a deferred opcode (op_region, Buffer,
 260                  *       buffer_field, or Package), the name of the object is already
 261                  *       in the namespace.
 262                  */
 263                 if (walk_state->deferred_node) {
 264
 265                         /* This name is already in the namespace, get the node */
 266
 267                         node = walk_state->deferred_node;
 268                         status = AE_OK;
 269                         break;
 270                 }
 271
 272                 /*
 273                  * If we are executing a method, do not create any namespace objects
 274                  * during the load phase, only during execution.
 275                  */
 276                 if (walk_state->method_node) {
 277                         node = NULL;
 278                         status = AE_OK;
 279                         break;
 280                 }
 281
 282                 flags = ACPI_NS_NO_UPSEARCH;
 283                 if ((walk_state->opcode != AML_SCOPE_OP) &&
 284                     (!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) {
 285                         if (walk_state->namespace_override) {
 286                                 flags |= ACPI_NS_OVERRIDE_IF_FOUND;
 287                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 288                                                   "[%s] Override allowed\n",
 289                                                   acpi_ut_get_type_name
 290                                                   (object_type)));
 291                         } else {
 292                                 flags |= ACPI_NS_ERROR_IF_FOUND;
 293                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 294                                                   "[%s] Cannot already exist\n",
 295                                                   acpi_ut_get_type_name
 296                                                   (object_type)));
 297                         }
 298                 } else {
 299                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 300                                           "[%s] Both Find or Create allowed\n",
 301                                           acpi_ut_get_type_name(object_type)));
 302                 }
 303
 304                 /*
 305                  * Enter the named type into the internal namespace. We enter the name
 306                  * as we go downward in the parse tree. Any necessary subobjects that
 307                  * involve arguments to the opcode must be created as we go back up the
 308                  * parse tree later.
 309                  */
 310                 status =
 311                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 312                                    ACPI_IMODE_LOAD_PASS1, flags, walk_state,
 313                                    &node);
 314                 if (ACPI_FAILURE(status)) {
 315                         if (status == AE_ALREADY_EXISTS) {
 316
 317                                 /* The name already exists in this scope */
 318
 319                                 if (node->flags & ANOBJ_IS_EXTERNAL) {
 320                                         /*
 321                                          * Allow one create on an object or segment that was
 322                                          * previously declared External
 323                                          */
 324                                         node->flags &= ~ANOBJ_IS_EXTERNAL;
 325                                         node->type = (u8) object_type;
 326
 327                                         /* Just retyped a node, probably will need to open a scope */
 328
 329                                         if (acpi_ns_opens_scope(object_type)) {
 330                                                 status =
 331                                                     acpi_ds_scope_stack_push
 332                                                     (node, object_type,
 333                                                      walk_state);
 334                                                 if (ACPI_FAILURE(status)) {
 335                                                         return_ACPI_STATUS
 336                                                             (status);
 337                                                 }
 338                                         }
 339
 340                                         status = AE_OK;
 341                                 }
 342                         }
 343
 344                         if (ACPI_FAILURE(status)) {
 345                                 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 346                                                      path, status);
 347                                 return_ACPI_STATUS(status);
 348                         }
 349                 }
 350                 break;
 351         }
 352
 353         /* Common exit */
 354
 355         if (!op) {
 356
 357                 /* Create a new op */
 358
 359                 op = acpi_ps_alloc_op(walk_state->opcode, walk_state->aml);
 360                 if (!op) {
 361                         return_ACPI_STATUS(AE_NO_MEMORY);
 362                 }
 363         }
 364
 365         /* Initialize the op */
 366
 367 #if (defined (ACPI_NO_METHOD_EXECUTION) || defined (ACPI_CONSTANT_EVAL_ONLY))
 368         op->named.path = path;
 369 #endif
 370
 371         if (node) {
 372                 /*
 373                  * Put the Node in the "op" object that the parser uses, so we
 374                  * can get it again quickly when this scope is closed
 375                  */
 376                 op->common.node = node;
 377                 op->named.name = node->name.integer;
 378         }
 379
 380         acpi_ps_append_arg(acpi_ps_get_parent_scope(&walk_state->parser_state),
 381                            op);
 382         *out_op = op;
 383         return_ACPI_STATUS(status);
 384 }
 385
 386 /*******************************************************************************
 387  *
 388  * FUNCTION:    acpi_ds_load1_end_op
 389  *
 390  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 391  *
 392  * RETURN:      Status
 393  *
 394  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 395  *              both control methods and everything else.
 396  *
 397  ******************************************************************************/
 398
 399 acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
 400 {
 401         union acpi_parse_object *op;
 402         acpi_object_type object_type;
 403         acpi_status status = AE_OK;
 404
 405 #ifdef ACPI_ASL_COMPILER
 406         u8 param_count;
 407 #endif
 408
 409         ACPI_FUNCTION_TRACE(ds_load1_end_op);
 410
 411         op = walk_state->op;
 412         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 413                           walk_state));
 414
 415         /*
 416          * Disassembler: handle create field operators here.
 417          *
 418          * create_buffer_field is a deferred op that is typically processed in load
 419          * pass 2. However, disassembly of control method contents walk the parse
 420          * tree with ACPI_PARSE_LOAD_PASS1 and AML_CREATE operators are processed
 421          * in a later walk. This is a problem when there is a control method that
 422          * has the same name as the AML_CREATE object. In this case, any use of the
 423          * name segment will be detected as a method call rather than a reference
 424          * to a buffer field.
 425          *
 426          * This earlier creation during disassembly solves this issue by inserting
 427          * the named object in the ACPI namespace so that references to this name
 428          * would be a name string rather than a method call.
 429          */
 430         if ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) &&
 431             (walk_state->op_info->flags & AML_CREATE)) {
 432                 status = acpi_ds_create_buffer_field(op, walk_state);
 433                 return_ACPI_STATUS(status);
 434         }
 435
 436         /* We are only interested in opcodes that have an associated name */
 437
 438         if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {
 439                 return_ACPI_STATUS(AE_OK);
 440         }
 441
 442         /* Get the object type to determine if we should pop the scope */
 443
 444         object_type = walk_state->op_info->object_type;
 445
 446 #ifndef ACPI_NO_METHOD_EXECUTION
 447         if (walk_state->op_info->flags & AML_FIELD) {
 448                 /*
 449                  * If we are executing a method, do not create any namespace objects
 450                  * during the load phase, only during execution.
 451                  */
 452                 if (!walk_state->method_node) {
 453                         if (walk_state->opcode == AML_FIELD_OP ||
 454                             walk_state->opcode == AML_BANK_FIELD_OP ||
 455                             walk_state->opcode == AML_INDEX_FIELD_OP) {
 456                                 status =
 457                                     acpi_ds_init_field_objects(op, walk_state);
 458                         }
 459                 }
 460                 return_ACPI_STATUS(status);
 461         }
 462
 463         /*
 464          * If we are executing a method, do not create any namespace objects
 465          * during the load phase, only during execution.
 466          */
 467         if (!walk_state->method_node) {
 468                 if (op->common.aml_opcode == AML_REGION_OP) {
 469                         status =
 470                             acpi_ex_create_region(op->named.data,
 471                                                   op->named.length,
 472                                                   (acpi_adr_space_type)
 473                                                   ((op->common.value.arg)->
 474                                                    common.value.integer),
 475                                                   walk_state);
 476                         if (ACPI_FAILURE(status)) {
 477                                 return_ACPI_STATUS(status);
 478                         }
 479                 } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
 480                         status =
 481                             acpi_ex_create_region(op->named.data,
 482                                                   op->named.length,
 483                                                   ACPI_ADR_SPACE_DATA_TABLE,
 484                                                   walk_state);
 485                         if (ACPI_FAILURE(status)) {
 486                                 return_ACPI_STATUS(status);
 487                         }
 488                 }
 489         }
 490 #endif
 491
 492         if (op->common.aml_opcode == AML_NAME_OP) {
 493
 494                 /* For Name opcode, get the object type from the argument */
 495
 496                 if (op->common.value.arg) {
 497                         object_type = (acpi_ps_get_opcode_info((op->common.
 498                                                                 value.arg)->
 499                                                                common.
 500                                                                aml_opcode))->
 501                             object_type;
 502
 503                         /* Set node type if we have a namespace node */
 504
 505                         if (op->common.node) {
 506                                 op->common.node->type = (u8) object_type;
 507                         }
 508                 }
 509         }
 510 #ifdef ACPI_ASL_COMPILER
 511         /*
 512          * For external opcode, get the object type from the argument and
 513          * get the parameter count from the argument's next.
 514          */
 515         if (acpi_gbl_disasm_flag &&
 516             op->common.node && op->common.aml_opcode == AML_EXTERNAL_OP) {
 517                 /*
 518                  * Note, if this external is not a method
 519                  * Op->Common.Value.Arg->Common.Next->Common.Value.Integer == 0
 520                  * Therefore, param_count will be 0.
 521                  */
 522                 param_count =
 523                     (u8)op->common.value.arg->common.next->common.value.integer;
 524                 object_type = (u8)op->common.value.arg->common.value.integer;
 525                 op->common.node->flags |= ANOBJ_IS_EXTERNAL;
 526                 op->common.node->type = (u8)object_type;
 527
 528                 acpi_dm_create_subobject_for_external((u8)object_type,
 529                                                       &op->common.node,
 530                                                       param_count);
 531
 532                 /*
 533                  * Add the external to the external list because we may be
 534                  * emitting code based off of the items within the external list.
 535                  */
 536                 acpi_dm_add_op_to_external_list(op, op->named.path,
 537                                                 (u8)object_type, param_count,
 538                                                 ACPI_EXT_ORIGIN_FROM_OPCODE |
 539                                                 ACPI_EXT_RESOLVED_REFERENCE);
 540         }
 541 #endif
 542
 543         /*
 544          * If we are executing a method, do not create any namespace objects
 545          * during the load phase, only during execution.
 546          */
 547         if (!walk_state->method_node) {
 548                 if (op->common.aml_opcode == AML_METHOD_OP) {
 549                         /*
 550                          * method_op pkg_length name_string method_flags term_list
 551                          *
 552                          * Note: We must create the method node/object pair as soon as we
 553                          * see the method declaration. This allows later pass1 parsing
 554                          * of invocations of the method (need to know the number of
 555                          * arguments.)
 556                          */
 557                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 558                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 559                                           walk_state, op, op->named.node));
 560
 561                         if (!acpi_ns_get_attached_object(op->named.node)) {
 562                                 walk_state->operands[0] =
 563                                     ACPI_CAST_PTR(void, op->named.node);
 564                                 walk_state->num_operands = 1;
 565
 566                                 status =
 567                                     acpi_ds_create_operands(walk_state,
 568                                                             op->common.value.
 569                                                             arg);
 570                                 if (ACPI_SUCCESS(status)) {
 571                                         status =
 572                                             acpi_ex_create_method(op->named.
 573                                                                   data,
 574                                                                   op->named.
 575                                                                   length,
 576                                                                   walk_state);
 577                                 }
 578
 579                                 walk_state->operands[0] = NULL;
 580                                 walk_state->num_operands = 0;
 581
 582                                 if (ACPI_FAILURE(status)) {
 583                                         return_ACPI_STATUS(status);
 584                                 }
 585                         }
 586                 }
 587         }
 588
 589         /* Pop the scope stack (only if loading a table) */
 590
 591         if (!walk_state->method_node &&
 592             op->common.aml_opcode != AML_EXTERNAL_OP &&
 593             acpi_ns_opens_scope(object_type)) {
 594                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 595                                   "(%s): Popping scope for Op %p\n",
 596                                   acpi_ut_get_type_name(object_type), op));
 597
 598                 status = acpi_ds_scope_stack_pop(walk_state);
 599         }
 600
 601         return_ACPI_STATUS(status);
 602 }