1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2/****************************************************************************** 3 * 4 * Module Name: evregion - Operation Region support 5 * 6 * Copyright (C) 2000 - 2020, Intel Corp. 7 * 8 *****************************************************************************/ 9 10#include <acpi/acpi.h> 11#include "accommon.h" 12#include "acevents.h" 13#include "acnamesp.h" 14#include "acinterp.h" 15 16#define _COMPONENT ACPI_EVENTS 17ACPI_MODULE_NAME("evregion") 18 19extern u8 acpi_gbl_default_address_spaces[]; 20 21/* Local prototypes */ 22 23static void 24acpi_ev_orphan_ec_reg_method(struct acpi_namespace_node *ec_device_node); 25 26static acpi_status 27acpi_ev_reg_run(acpi_handle obj_handle, 28 u32 level, void *context, void **return_value); 29 30/******************************************************************************* 31 * 32 * FUNCTION: acpi_ev_initialize_op_regions 33 * 34 * PARAMETERS: None 35 * 36 * RETURN: Status 37 * 38 * DESCRIPTION: Execute _REG methods for all Operation Regions that have 39 * an installed default region handler. 40 * 41 ******************************************************************************/ 42 43acpi_status acpi_ev_initialize_op_regions(void) 44{ 45 acpi_status status; 46 u32 i; 47 48 ACPI_FUNCTION_TRACE(ev_initialize_op_regions); 49 50 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 51 if (ACPI_FAILURE(status)) { 52 return_ACPI_STATUS(status); 53 } 54 55 /* Run the _REG methods for op_regions in each default address space */ 56 57 for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) { 58 /* 59 * Make sure the installed handler is the DEFAULT handler. If not the 60 * default, the _REG methods will have already been run (when the 61 * handler was installed) 62 */ 63 if (acpi_ev_has_default_handler(acpi_gbl_root_node, 64 acpi_gbl_default_address_spaces 65 [i])) { 66 acpi_ev_execute_reg_methods(acpi_gbl_root_node, 67 acpi_gbl_default_address_spaces 68 [i], ACPI_REG_CONNECT); 69 } 70 } 71 72 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 73 return_ACPI_STATUS(status); 74} 75 76/******************************************************************************* 77 * 78 * FUNCTION: acpi_ev_address_space_dispatch 79 * 80 * PARAMETERS: region_obj - Internal region object 81 * field_obj - Corresponding field. Can be NULL. 82 * function - Read or Write operation 83 * region_offset - Where in the region to read or write 84 * bit_width - Field width in bits (8, 16, 32, or 64) 85 * value - Pointer to in or out value, must be 86 * a full 64-bit integer 87 * 88 * RETURN: Status 89 * 90 * DESCRIPTION: Dispatch an address space or operation region access to 91 * a previously installed handler. 92 * 93 * NOTE: During early initialization, we always install the default region 94 * handlers for Memory, I/O and PCI_Config. This ensures that these operation 95 * region address spaces are always available as per the ACPI specification. 96 * This is especially needed in order to support the execution of 97 * module-level AML code during loading of the ACPI tables. 98 * 99 ******************************************************************************/ 100 101acpi_status 102acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj, 103 union acpi_operand_object *field_obj, 104 u32 function, 105 u32 region_offset, u32 bit_width, u64 *value) 106{ 107 acpi_status status; 108 acpi_adr_space_handler handler; 109 acpi_adr_space_setup region_setup; 110 union acpi_operand_object *handler_desc; 111 union acpi_operand_object *region_obj2; 112 void *region_context = NULL; 113 struct acpi_connection_info *context; 114 acpi_mutex context_mutex; 115 u8 context_locked; 116 acpi_physical_address address; 117 118 ACPI_FUNCTION_TRACE(ev_address_space_dispatch); 119 120 region_obj2 = acpi_ns_get_secondary_object(region_obj); 121 if (!region_obj2) { 122 return_ACPI_STATUS(AE_NOT_EXIST); 123 } 124 125 /* Ensure that there is a handler associated with this region */ 126 127 handler_desc = region_obj->region.handler; 128 if (!handler_desc) { 129 ACPI_ERROR((AE_INFO, 130 "No handler for Region [%4.4s] (%p) [%s]", 131 acpi_ut_get_node_name(region_obj->region.node), 132 region_obj, 133 acpi_ut_get_region_name(region_obj->region. 134 space_id))); 135 136 return_ACPI_STATUS(AE_NOT_EXIST); 137 } 138 139 context = handler_desc->address_space.context; 140 context_mutex = handler_desc->address_space.context_mutex; 141 context_locked = FALSE; 142 143 /* 144 * It may be the case that the region has never been initialized. 145 * Some types of regions require special init code 146 */ 147 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) { 148 149 /* This region has not been initialized yet, do it */ 150 151 region_setup = handler_desc->address_space.setup; 152 if (!region_setup) { 153 154 /* No initialization routine, exit with error */ 155 156 ACPI_ERROR((AE_INFO, 157 "No init routine for region(%p) [%s]", 158 region_obj, 159 acpi_ut_get_region_name(region_obj->region. 160 space_id))); 161 return_ACPI_STATUS(AE_NOT_EXIST); 162 } 163 164 /* 165 * We must exit the interpreter because the region setup will 166 * potentially execute control methods (for example, the _REG method 167 * for this region) 168 */ 169 acpi_ex_exit_interpreter(); 170 171 status = region_setup(region_obj, ACPI_REGION_ACTIVATE, 172 context, ®ion_context); 173 174 /* Re-enter the interpreter */ 175 176 acpi_ex_enter_interpreter(); 177 178 /* Check for failure of the Region Setup */ 179 180 if (ACPI_FAILURE(status)) { 181 ACPI_EXCEPTION((AE_INFO, status, 182 "During region initialization: [%s]", 183 acpi_ut_get_region_name(region_obj-> 184 region. 185 space_id))); 186 return_ACPI_STATUS(status); 187 } 188 189 /* Region initialization may have been completed by region_setup */ 190 191 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) { 192 region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE; 193 194 /* 195 * Save the returned context for use in all accesses to 196 * the handler for this particular region 197 */ 198 if (!(region_obj2->extra.region_context)) { 199 region_obj2->extra.region_context = 200 region_context; 201 } 202 } 203 } 204 205 /* We have everything we need, we can invoke the address space handler */ 206 207 handler = handler_desc->address_space.handler; 208 address = (region_obj->region.address + region_offset); 209 210 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 211 "Handler %p (@%p) Address %8.8X%8.8X [%s]\n", 212 ®ion_obj->region.handler->address_space, handler, 213 ACPI_FORMAT_UINT64(address), 214 acpi_ut_get_region_name(region_obj->region. 215 space_id))); 216 217 if (!(handler_desc->address_space.handler_flags & 218 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) { 219 /* 220 * For handlers other than the default (supplied) handlers, we must 221 * exit the interpreter because the handler *might* block -- we don't 222 * know what it will do, so we can't hold the lock on the interpreter. 223 */ 224 acpi_ex_exit_interpreter(); 225 } 226 227 /* 228 * Special handling for generic_serial_bus and general_purpose_io: 229 * There are three extra parameters that must be passed to the 230 * handler via the context: 231 * 1) Connection buffer, a resource template from Connection() op 232 * 2) Length of the above buffer 233 * 3) Actual access length from the access_as() op 234 * 235 * Since we pass these extra parameters via the context, which is 236 * shared between threads, we must lock the context to avoid these 237 * parameters being changed from another thread before the handler 238 * has completed running. 239 * 240 * In addition, for general_purpose_io, the Address and bit_width fields 241 * are defined as follows: 242 * 1) Address is the pin number index of the field (bit offset from 243 * the previous Connection) 244 * 2) bit_width is the actual bit length of the field (number of pins) 245 */ 246 if ((region_obj->region.space_id == ACPI_ADR_SPACE_GSBUS) && 247 context && field_obj) { 248 249 status = 250 acpi_os_acquire_mutex(context_mutex, ACPI_WAIT_FOREVER); 251 if (ACPI_FAILURE(status)) { 252 goto re_enter_interpreter; 253 } 254 255 context_locked = TRUE; 256 257 /* Get the Connection (resource_template) buffer */ 258 259 context->connection = field_obj->field.resource_buffer; 260 context->length = field_obj->field.resource_length; 261 context->access_length = field_obj->field.access_length; 262 } 263 if ((region_obj->region.space_id == ACPI_ADR_SPACE_GPIO) && 264 context && field_obj) { 265 266 status = 267 acpi_os_acquire_mutex(context_mutex, ACPI_WAIT_FOREVER); 268 if (ACPI_FAILURE(status)) { 269 goto re_enter_interpreter; 270 } 271 272 context_locked = TRUE; 273 274 /* Get the Connection (resource_template) buffer */ 275 276 context->connection = field_obj->field.resource_buffer; 277 context->length = field_obj->field.resource_length; 278 context->access_length = field_obj->field.access_length; 279 address = field_obj->field.pin_number_index; 280 bit_width = field_obj->field.bit_length; 281 } 282 283 /* Call the handler */ 284 285 status = handler(function, address, bit_width, value, context, 286 region_obj2->extra.region_context); 287 288 if (context_locked) { 289 acpi_os_release_mutex(context_mutex); 290 } 291 292 if (ACPI_FAILURE(status)) { 293 ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]", 294 acpi_ut_get_region_name(region_obj->region. 295 space_id))); 296 297 /* 298 * Special case for an EC timeout. These are seen so frequently 299 * that an additional error message is helpful 300 */ 301 if ((region_obj->region.space_id == ACPI_ADR_SPACE_EC) && 302 (status == AE_TIME)) { 303 ACPI_ERROR((AE_INFO, 304 "Timeout from EC hardware or EC device driver")); 305 } 306 } 307 308re_enter_interpreter: 309 if (!(handler_desc->address_space.handler_flags & 310 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) { 311 /* 312 * We just returned from a non-default handler, we must re-enter the 313 * interpreter 314 */ 315 acpi_ex_enter_interpreter(); 316 } 317 318 return_ACPI_STATUS(status); 319} 320 321/******************************************************************************* 322 * 323 * FUNCTION: acpi_ev_detach_region 324 * 325 * PARAMETERS: region_obj - Region Object 326 * acpi_ns_is_locked - Namespace Region Already Locked? 327 * 328 * RETURN: None 329 * 330 * DESCRIPTION: Break the association between the handler and the region 331 * this is a two way association. 332 * 333 ******************************************************************************/ 334 335void 336acpi_ev_detach_region(union acpi_operand_object *region_obj, 337 u8 acpi_ns_is_locked) 338{ 339 union acpi_operand_object *handler_obj; 340 union acpi_operand_object *obj_desc; 341 union acpi_operand_object *start_desc; 342 union acpi_operand_object **last_obj_ptr; 343 acpi_adr_space_setup region_setup; 344 void **region_context; 345 union acpi_operand_object *region_obj2; 346 acpi_status status; 347 348 ACPI_FUNCTION_TRACE(ev_detach_region); 349 350 region_obj2 = acpi_ns_get_secondary_object(region_obj); 351 if (!region_obj2) { 352 return_VOID; 353 } 354 region_context = ®ion_obj2->extra.region_context; 355 356 /* Get the address handler from the region object */ 357 358 handler_obj = region_obj->region.handler; 359 if (!handler_obj) { 360 361 /* This region has no handler, all done */ 362 363 return_VOID; 364 } 365 366 /* Find this region in the handler's list */ 367 368 obj_desc = handler_obj->address_space.region_list; 369 start_desc = obj_desc; 370 last_obj_ptr = &handler_obj->address_space.region_list; 371 372 while (obj_desc) { 373 374 /* Is this the correct Region? */ 375 376 if (obj_desc == region_obj) { 377 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 378 "Removing Region %p from address handler %p\n", 379 region_obj, handler_obj)); 380 381 /* This is it, remove it from the handler's list */ 382 383 *last_obj_ptr = obj_desc->region.next; 384 obj_desc->region.next = NULL; /* Must clear field */ 385 386 if (acpi_ns_is_locked) { 387 status = 388 acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 389 if (ACPI_FAILURE(status)) { 390 return_VOID; 391 } 392 } 393 394 /* Now stop region accesses by executing the _REG method */ 395 396 status = 397 acpi_ev_execute_reg_method(region_obj, 398 ACPI_REG_DISCONNECT); 399 if (ACPI_FAILURE(status)) { 400 ACPI_EXCEPTION((AE_INFO, status, 401 "from region _REG, [%s]", 402 acpi_ut_get_region_name 403 (region_obj->region.space_id))); 404 } 405 406 if (acpi_ns_is_locked) { 407 status = 408 acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 409 if (ACPI_FAILURE(status)) { 410 return_VOID; 411 } 412 } 413 414 /* 415 * If the region has been activated, call the setup handler with 416 * the deactivate notification 417 */ 418 if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) { 419 region_setup = handler_obj->address_space.setup; 420 status = 421 region_setup(region_obj, 422 ACPI_REGION_DEACTIVATE, 423 handler_obj->address_space. 424 context, region_context); 425 426 /* 427 * region_context should have been released by the deactivate 428 * operation. We don't need access to it anymore here. 429 */ 430 if (region_context) { 431 *region_context = NULL; 432 } 433 434 /* Init routine may fail, Just ignore errors */ 435 436 if (ACPI_FAILURE(status)) { 437 ACPI_EXCEPTION((AE_INFO, status, 438 "from region handler - deactivate, [%s]", 439 acpi_ut_get_region_name 440 (region_obj->region. 441 space_id))); 442 } 443 444 region_obj->region.flags &= 445 ~(AOPOBJ_SETUP_COMPLETE); 446 } 447 448 /* 449 * Remove handler reference in the region 450 * 451 * NOTE: this doesn't mean that the region goes away, the region 452 * is just inaccessible as indicated to the _REG method 453 * 454 * If the region is on the handler's list, this must be the 455 * region's handler 456 */ 457 region_obj->region.handler = NULL; 458 acpi_ut_remove_reference(handler_obj); 459 460 return_VOID; 461 } 462 463 /* Walk the linked list of handlers */ 464 465 last_obj_ptr = &obj_desc->region.next; 466 obj_desc = obj_desc->region.next; 467 468 /* Prevent infinite loop if list is corrupted */ 469 470 if (obj_desc == start_desc) { 471 ACPI_ERROR((AE_INFO, 472 "Circular handler list in region object %p", 473 region_obj)); 474 return_VOID; 475 } 476 } 477 478 /* If we get here, the region was not in the handler's region list */ 479 480 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 481 "Cannot remove region %p from address handler %p\n", 482 region_obj, handler_obj)); 483 484 return_VOID; 485} 486 487/******************************************************************************* 488 * 489 * FUNCTION: acpi_ev_attach_region 490 * 491 * PARAMETERS: handler_obj - Handler Object 492 * region_obj - Region Object 493 * acpi_ns_is_locked - Namespace Region Already Locked? 494 * 495 * RETURN: None 496 * 497 * DESCRIPTION: Create the association between the handler and the region 498 * this is a two way association. 499 * 500 ******************************************************************************/ 501 502acpi_status 503acpi_ev_attach_region(union acpi_operand_object *handler_obj, 504 union acpi_operand_object *region_obj, 505 u8 acpi_ns_is_locked) 506{ 507 508 ACPI_FUNCTION_TRACE(ev_attach_region); 509 510 /* Install the region's handler */ 511 512 if (region_obj->region.handler) { 513 return_ACPI_STATUS(AE_ALREADY_EXISTS); 514 } 515 516 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 517 "Adding Region [%4.4s] %p to address handler %p [%s]\n", 518 acpi_ut_get_node_name(region_obj->region.node), 519 region_obj, handler_obj, 520 acpi_ut_get_region_name(region_obj->region. 521 space_id))); 522 523 /* Link this region to the front of the handler's list */ 524 525 region_obj->region.next = handler_obj->address_space.region_list; 526 handler_obj->address_space.region_list = region_obj; 527 region_obj->region.handler = handler_obj; 528 acpi_ut_add_reference(handler_obj); 529 530 return_ACPI_STATUS(AE_OK); 531} 532 533/******************************************************************************* 534 * 535 * FUNCTION: acpi_ev_execute_reg_method 536 * 537 * PARAMETERS: region_obj - Region object 538 * function - Passed to _REG: On (1) or Off (0) 539 * 540 * RETURN: Status 541 * 542 * DESCRIPTION: Execute _REG method for a region 543 * 544 ******************************************************************************/ 545 546acpi_status 547acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function) 548{ 549 struct acpi_evaluate_info *info; 550 union acpi_operand_object *args[3]; 551 union acpi_operand_object *region_obj2; 552 const acpi_name *reg_name_ptr = 553 ACPI_CAST_PTR(acpi_name, METHOD_NAME__REG); 554 struct acpi_namespace_node *method_node; 555 struct acpi_namespace_node *node; 556 acpi_status status; 557 558 ACPI_FUNCTION_TRACE(ev_execute_reg_method); 559 560 if (!acpi_gbl_namespace_initialized || 561 region_obj->region.handler == NULL) { 562 return_ACPI_STATUS(AE_OK); 563 } 564 565 region_obj2 = acpi_ns_get_secondary_object(region_obj); 566 if (!region_obj2) { 567 return_ACPI_STATUS(AE_NOT_EXIST); 568 } 569 570 /* 571 * Find any "_REG" method associated with this region definition. 572 * The method should always be updated as this function may be 573 * invoked after a namespace change. 574 */ 575 node = region_obj->region.node->parent; 576 status = 577 acpi_ns_search_one_scope(*reg_name_ptr, node, ACPI_TYPE_METHOD, 578 &method_node); 579 if (ACPI_SUCCESS(status)) { 580 /* 581 * The _REG method is optional and there can be only one per 582 * region definition. This will be executed when the handler is 583 * attached or removed. 584 */ 585 region_obj2->extra.method_REG = method_node; 586 } 587 if (region_obj2->extra.method_REG == NULL) { 588 return_ACPI_STATUS(AE_OK); 589 } 590 591 /* _REG(DISCONNECT) should be paired with _REG(CONNECT) */ 592 593 if ((function == ACPI_REG_CONNECT && 594 region_obj->common.flags & AOPOBJ_REG_CONNECTED) || 595 (function == ACPI_REG_DISCONNECT && 596 !(region_obj->common.flags & AOPOBJ_REG_CONNECTED))) { 597 return_ACPI_STATUS(AE_OK); 598 } 599 600 /* Allocate and initialize the evaluation information block */ 601 602 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); 603 if (!info) { 604 return_ACPI_STATUS(AE_NO_MEMORY); 605 } 606 607 info->prefix_node = region_obj2->extra.method_REG; 608 info->relative_pathname = NULL; 609 info->parameters = args; 610 info->flags = ACPI_IGNORE_RETURN_VALUE; 611 612 /* 613 * The _REG method has two arguments: 614 * 615 * arg0 - Integer: 616 * Operation region space ID Same value as region_obj->Region.space_id 617 * 618 * arg1 - Integer: 619 * connection status 1 for connecting the handler, 0 for disconnecting 620 * the handler (Passed as a parameter) 621 */ 622 args[0] = 623 acpi_ut_create_integer_object((u64)region_obj->region.space_id); 624 if (!args[0]) { 625 status = AE_NO_MEMORY; 626 goto cleanup1; 627 } 628 629 args[1] = acpi_ut_create_integer_object((u64)function); 630 if (!args[1]) { 631 status = AE_NO_MEMORY; 632 goto cleanup2; 633 } 634 635 args[2] = NULL; /* Terminate list */ 636 637 /* Execute the method, no return value */ 638 639 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname 640 (ACPI_TYPE_METHOD, info->prefix_node, NULL)); 641 642 status = acpi_ns_evaluate(info); 643 acpi_ut_remove_reference(args[1]); 644 645 if (ACPI_FAILURE(status)) { 646 goto cleanup2; 647 } 648 649 if (function == ACPI_REG_CONNECT) { 650 region_obj->common.flags |= AOPOBJ_REG_CONNECTED; 651 } else { 652 region_obj->common.flags &= ~AOPOBJ_REG_CONNECTED; 653 } 654 655cleanup2: 656 acpi_ut_remove_reference(args[0]); 657 658cleanup1: 659 ACPI_FREE(info); 660 return_ACPI_STATUS(status); 661} 662 663/******************************************************************************* 664 * 665 * FUNCTION: acpi_ev_execute_reg_methods 666 * 667 * PARAMETERS: node - Namespace node for the device 668 * space_id - The address space ID 669 * function - Passed to _REG: On (1) or Off (0) 670 * 671 * RETURN: None 672 * 673 * DESCRIPTION: Run all _REG methods for the input Space ID; 674 * Note: assumes namespace is locked, or system init time. 675 * 676 ******************************************************************************/ 677 678void 679acpi_ev_execute_reg_methods(struct acpi_namespace_node *node, 680 acpi_adr_space_type space_id, u32 function) 681{ 682 struct acpi_reg_walk_info info; 683 684 ACPI_FUNCTION_TRACE(ev_execute_reg_methods); 685 686 /* 687 * These address spaces do not need a call to _REG, since the ACPI 688 * specification defines them as: "must always be accessible". Since 689 * they never change state (never become unavailable), no need to ever 690 * call _REG on them. Also, a data_table is not a "real" address space, 691 * so do not call _REG. September 2018. 692 */ 693 if ((space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) || 694 (space_id == ACPI_ADR_SPACE_SYSTEM_IO) || 695 (space_id == ACPI_ADR_SPACE_DATA_TABLE)) { 696 return_VOID; 697 } 698 699 info.space_id = space_id; 700 info.function = function; 701 info.reg_run_count = 0; 702 703 ACPI_DEBUG_PRINT_RAW((ACPI_DB_NAMES, 704 " Running _REG methods for SpaceId %s\n", 705 acpi_ut_get_region_name(info.space_id))); 706 707 /* 708 * Run all _REG methods for all Operation Regions for this space ID. This 709 * is a separate walk in order to handle any interdependencies between 710 * regions and _REG methods. (i.e. handlers must be installed for all 711 * regions of this Space ID before we can run any _REG methods) 712 */ 713 (void)acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX, 714 ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run, NULL, 715 &info, NULL); 716 717 /* Special case for EC: handle "orphan" _REG methods with no region */ 718 719 if (space_id == ACPI_ADR_SPACE_EC) { 720 acpi_ev_orphan_ec_reg_method(node); 721 } 722 723 ACPI_DEBUG_PRINT_RAW((ACPI_DB_NAMES, 724 " Executed %u _REG methods for SpaceId %s\n", 725 info.reg_run_count, 726 acpi_ut_get_region_name(info.space_id))); 727 728 return_VOID; 729} 730 731/******************************************************************************* 732 * 733 * FUNCTION: acpi_ev_reg_run 734 * 735 * PARAMETERS: walk_namespace callback 736 * 737 * DESCRIPTION: Run _REG method for region objects of the requested spaceID 738 * 739 ******************************************************************************/ 740 741static acpi_status 742acpi_ev_reg_run(acpi_handle obj_handle, 743 u32 level, void *context, void **return_value) 744{ 745 union acpi_operand_object *obj_desc; 746 struct acpi_namespace_node *node; 747 acpi_status status; 748 struct acpi_reg_walk_info *info; 749 750 info = ACPI_CAST_PTR(struct acpi_reg_walk_info, context); 751 752 /* Convert and validate the device handle */ 753 754 node = acpi_ns_validate_handle(obj_handle); 755 if (!node) { 756 return (AE_BAD_PARAMETER); 757 } 758 759 /* 760 * We only care about regions and objects that are allowed to have 761 * address space handlers 762 */ 763 if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) { 764 return (AE_OK); 765 } 766 767 /* Check for an existing internal object */ 768 769 obj_desc = acpi_ns_get_attached_object(node); 770 if (!obj_desc) { 771 772 /* No object, just exit */ 773 774 return (AE_OK); 775 } 776 777 /* Object is a Region */ 778 779 if (obj_desc->region.space_id != info->space_id) { 780 781 /* This region is for a different address space, just ignore it */ 782 783 return (AE_OK); 784 } 785 786 info->reg_run_count++; 787 status = acpi_ev_execute_reg_method(obj_desc, info->function); 788 return (status); 789} 790 791/******************************************************************************* 792 * 793 * FUNCTION: acpi_ev_orphan_ec_reg_method 794 * 795 * PARAMETERS: ec_device_node - Namespace node for an EC device 796 * 797 * RETURN: None 798 * 799 * DESCRIPTION: Execute an "orphan" _REG method that appears under the EC 800 * device. This is a _REG method that has no corresponding region 801 * within the EC device scope. The orphan _REG method appears to 802 * have been enabled by the description of the ECDT in the ACPI 803 * specification: "The availability of the region space can be 804 * detected by providing a _REG method object underneath the 805 * Embedded Controller device." 806 * 807 * To quickly access the EC device, we use the ec_device_node used 808 * during EC handler installation. Otherwise, we would need to 809 * perform a time consuming namespace walk, executing _HID 810 * methods to find the EC device. 811 * 812 * MUTEX: Assumes the namespace is locked 813 * 814 ******************************************************************************/ 815 816static void 817acpi_ev_orphan_ec_reg_method(struct acpi_namespace_node *ec_device_node) 818{ 819 acpi_handle reg_method; 820 struct acpi_namespace_node *next_node; 821 acpi_status status; 822 struct acpi_object_list args; 823 union acpi_object objects[2]; 824 825 ACPI_FUNCTION_TRACE(ev_orphan_ec_reg_method); 826 827 if (!ec_device_node) { 828 return_VOID; 829 } 830 831 /* Namespace is currently locked, must release */ 832 833 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 834 835 /* Get a handle to a _REG method immediately under the EC device */ 836 837 status = acpi_get_handle(ec_device_node, METHOD_NAME__REG, ®_method); 838 if (ACPI_FAILURE(status)) { 839 goto exit; /* There is no _REG method present */ 840 } 841 842 /* 843 * Execute the _REG method only if there is no Operation Region in 844 * this scope with the Embedded Controller space ID. Otherwise, it 845 * will already have been executed. Note, this allows for Regions 846 * with other space IDs to be present; but the code below will then 847 * execute the _REG method with the embedded_control space_ID argument. 848 */ 849 next_node = acpi_ns_get_next_node(ec_device_node, NULL); 850 while (next_node) { 851 if ((next_node->type == ACPI_TYPE_REGION) && 852 (next_node->object) && 853 (next_node->object->region.space_id == ACPI_ADR_SPACE_EC)) { 854 goto exit; /* Do not execute the _REG */ 855 } 856 857 next_node = acpi_ns_get_next_node(ec_device_node, next_node); 858 } 859 860 /* Evaluate the _REG(embedded_control,Connect) method */ 861 862 args.count = 2; 863 args.pointer = objects; 864 objects[0].type = ACPI_TYPE_INTEGER; 865 objects[0].integer.value = ACPI_ADR_SPACE_EC; 866 objects[1].type = ACPI_TYPE_INTEGER; 867 objects[1].integer.value = ACPI_REG_CONNECT; 868 869 (void)acpi_evaluate_object(reg_method, NULL, &args, NULL); 870 871exit: 872 /* We ignore all errors from above, don't care */ 873 874 (void)acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 875 return_VOID; 876} 877