1/****************************************************************************** 2 * 3 * Module Name: evregion - ACPI address_space (op_region) handler dispatch 4 * 5 *****************************************************************************/ 6 7/* 8 * Copyright (C) 2000 - 2010, 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 "acevents.h" 47#include "acnamesp.h" 48#include "acinterp.h" 49 50#define _COMPONENT ACPI_EVENTS 51ACPI_MODULE_NAME("evregion") 52 53/* Local prototypes */ 54static u8 55acpi_ev_has_default_handler(struct acpi_namespace_node *node, 56 acpi_adr_space_type space_id); 57 58static acpi_status 59acpi_ev_reg_run(acpi_handle obj_handle, 60 u32 level, void *context, void **return_value); 61 62static acpi_status 63acpi_ev_install_handler(acpi_handle obj_handle, 64 u32 level, void *context, void **return_value); 65 66/* These are the address spaces that will get default handlers */ 67 68#define ACPI_NUM_DEFAULT_SPACES 4 69 70static u8 acpi_gbl_default_address_spaces[ACPI_NUM_DEFAULT_SPACES] = { 71 ACPI_ADR_SPACE_SYSTEM_MEMORY, 72 ACPI_ADR_SPACE_SYSTEM_IO, 73 ACPI_ADR_SPACE_PCI_CONFIG, 74 ACPI_ADR_SPACE_DATA_TABLE 75}; 76 77/******************************************************************************* 78 * 79 * FUNCTION: acpi_ev_install_region_handlers 80 * 81 * PARAMETERS: None 82 * 83 * RETURN: Status 84 * 85 * DESCRIPTION: Installs the core subsystem default address space handlers. 86 * 87 ******************************************************************************/ 88 89acpi_status acpi_ev_install_region_handlers(void) 90{ 91 acpi_status status; 92 u32 i; 93 94 ACPI_FUNCTION_TRACE(ev_install_region_handlers); 95 96 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 97 if (ACPI_FAILURE(status)) { 98 return_ACPI_STATUS(status); 99 } 100 101 /* 102 * All address spaces (PCI Config, EC, SMBus) are scope dependent and 103 * registration must occur for a specific device. 104 * 105 * In the case of the system memory and IO address spaces there is 106 * currently no device associated with the address space. For these we 107 * use the root. 108 * 109 * We install the default PCI config space handler at the root so that 110 * this space is immediately available even though the we have not 111 * enumerated all the PCI Root Buses yet. This is to conform to the ACPI 112 * specification which states that the PCI config space must be always 113 * available -- even though we are nowhere near ready to find the PCI root 114 * buses at this point. 115 * 116 * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler 117 * has already been installed (via acpi_install_address_space_handler). 118 * Similar for AE_SAME_HANDLER. 119 */ 120 for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) { 121 status = acpi_ev_install_space_handler(acpi_gbl_root_node, 122 acpi_gbl_default_address_spaces 123 [i], 124 ACPI_DEFAULT_HANDLER, 125 NULL, NULL); 126 switch (status) { 127 case AE_OK: 128 case AE_SAME_HANDLER: 129 case AE_ALREADY_EXISTS: 130 131 /* These exceptions are all OK */ 132 133 status = AE_OK; 134 break; 135 136 default: 137 138 goto unlock_and_exit; 139 } 140 } 141 142 unlock_and_exit: 143 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 144 return_ACPI_STATUS(status); 145} 146 147/******************************************************************************* 148 * 149 * FUNCTION: acpi_ev_has_default_handler 150 * 151 * PARAMETERS: Node - Namespace node for the device 152 * space_id - The address space ID 153 * 154 * RETURN: TRUE if default handler is installed, FALSE otherwise 155 * 156 * DESCRIPTION: Check if the default handler is installed for the requested 157 * space ID. 158 * 159 ******************************************************************************/ 160 161static u8 162acpi_ev_has_default_handler(struct acpi_namespace_node *node, 163 acpi_adr_space_type space_id) 164{ 165 union acpi_operand_object *obj_desc; 166 union acpi_operand_object *handler_obj; 167 168 /* Must have an existing internal object */ 169 170 obj_desc = acpi_ns_get_attached_object(node); 171 if (obj_desc) { 172 handler_obj = obj_desc->device.handler; 173 174 /* Walk the linked list of handlers for this object */ 175 176 while (handler_obj) { 177 if (handler_obj->address_space.space_id == space_id) { 178 if (handler_obj->address_space.handler_flags & 179 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) { 180 return (TRUE); 181 } 182 } 183 184 handler_obj = handler_obj->address_space.next; 185 } 186 } 187 188 return (FALSE); 189} 190 191/******************************************************************************* 192 * 193 * FUNCTION: acpi_ev_initialize_op_regions 194 * 195 * PARAMETERS: None 196 * 197 * RETURN: Status 198 * 199 * DESCRIPTION: Execute _REG methods for all Operation Regions that have 200 * an installed default region handler. 201 * 202 ******************************************************************************/ 203 204acpi_status acpi_ev_initialize_op_regions(void) 205{ 206 acpi_status status; 207 u32 i; 208 209 ACPI_FUNCTION_TRACE(ev_initialize_op_regions); 210 211 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 212 if (ACPI_FAILURE(status)) { 213 return_ACPI_STATUS(status); 214 } 215 216 /* Run the _REG methods for op_regions in each default address space */ 217 218 for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) { 219 /* 220 * Make sure the installed handler is the DEFAULT handler. If not the 221 * default, the _REG methods will have already been run (when the 222 * handler was installed) 223 */ 224 if (acpi_ev_has_default_handler(acpi_gbl_root_node, 225 acpi_gbl_default_address_spaces 226 [i])) { 227 status = 228 acpi_ev_execute_reg_methods(acpi_gbl_root_node, 229 acpi_gbl_default_address_spaces 230 [i]); 231 } 232 } 233 234 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 235 return_ACPI_STATUS(status); 236} 237 238/******************************************************************************* 239 * 240 * FUNCTION: acpi_ev_execute_reg_method 241 * 242 * PARAMETERS: region_obj - Region object 243 * Function - Passed to _REG: On (1) or Off (0) 244 * 245 * RETURN: Status 246 * 247 * DESCRIPTION: Execute _REG method for a region 248 * 249 ******************************************************************************/ 250 251acpi_status 252acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function) 253{ 254 struct acpi_evaluate_info *info; 255 union acpi_operand_object *args[3]; 256 union acpi_operand_object *region_obj2; 257 acpi_status status; 258 259 ACPI_FUNCTION_TRACE(ev_execute_reg_method); 260 261 region_obj2 = acpi_ns_get_secondary_object(region_obj); 262 if (!region_obj2) { 263 return_ACPI_STATUS(AE_NOT_EXIST); 264 } 265 266 if (region_obj2->extra.method_REG == NULL) { 267 return_ACPI_STATUS(AE_OK); 268 } 269 270 /* Allocate and initialize the evaluation information block */ 271 272 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); 273 if (!info) { 274 return_ACPI_STATUS(AE_NO_MEMORY); 275 } 276 277 info->prefix_node = region_obj2->extra.method_REG; 278 info->pathname = NULL; 279 info->parameters = args; 280 info->flags = ACPI_IGNORE_RETURN_VALUE; 281 282 /* 283 * The _REG method has two arguments: 284 * 285 * Arg0 - Integer: 286 * Operation region space ID Same value as region_obj->Region.space_id 287 * 288 * Arg1 - Integer: 289 * connection status 1 for connecting the handler, 0 for disconnecting 290 * the handler (Passed as a parameter) 291 */ 292 args[0] = 293 acpi_ut_create_integer_object((u64) region_obj->region.space_id); 294 if (!args[0]) { 295 status = AE_NO_MEMORY; 296 goto cleanup1; 297 } 298 299 args[1] = acpi_ut_create_integer_object((u64) function); 300 if (!args[1]) { 301 status = AE_NO_MEMORY; 302 goto cleanup2; 303 } 304 305 args[2] = NULL; /* Terminate list */ 306 307 /* Execute the method, no return value */ 308 309 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname 310 (ACPI_TYPE_METHOD, info->prefix_node, NULL)); 311 312 status = acpi_ns_evaluate(info); 313 acpi_ut_remove_reference(args[1]); 314 315 cleanup2: 316 acpi_ut_remove_reference(args[0]); 317 318 cleanup1: 319 ACPI_FREE(info); 320 return_ACPI_STATUS(status); 321} 322 323/******************************************************************************* 324 * 325 * FUNCTION: acpi_ev_address_space_dispatch 326 * 327 * PARAMETERS: region_obj - Internal region object 328 * Function - Read or Write operation 329 * region_offset - Where in the region to read or write 330 * bit_width - Field width in bits (8, 16, 32, or 64) 331 * Value - Pointer to in or out value, must be 332 * a full 64-bit integer 333 * 334 * RETURN: Status 335 * 336 * DESCRIPTION: Dispatch an address space or operation region access to 337 * a previously installed handler. 338 * 339 ******************************************************************************/ 340 341acpi_status 342acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj, 343 u32 function, 344 u32 region_offset, u32 bit_width, u64 *value) 345{ 346 acpi_status status; 347 acpi_adr_space_handler handler; 348 acpi_adr_space_setup region_setup; 349 union acpi_operand_object *handler_desc; 350 union acpi_operand_object *region_obj2; 351 void *region_context = NULL; 352 353 ACPI_FUNCTION_TRACE(ev_address_space_dispatch); 354 355 region_obj2 = acpi_ns_get_secondary_object(region_obj); 356 if (!region_obj2) { 357 return_ACPI_STATUS(AE_NOT_EXIST); 358 } 359 360 /* Ensure that there is a handler associated with this region */ 361 362 handler_desc = region_obj->region.handler; 363 if (!handler_desc) { 364 ACPI_ERROR((AE_INFO, 365 "No handler for Region [%4.4s] (%p) [%s]", 366 acpi_ut_get_node_name(region_obj->region.node), 367 region_obj, 368 acpi_ut_get_region_name(region_obj->region. 369 space_id))); 370 371 return_ACPI_STATUS(AE_NOT_EXIST); 372 } 373 374 /* 375 * It may be the case that the region has never been initialized. 376 * Some types of regions require special init code 377 */ 378 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) { 379 380 /* This region has not been initialized yet, do it */ 381 382 region_setup = handler_desc->address_space.setup; 383 if (!region_setup) { 384 385 /* No initialization routine, exit with error */ 386 387 ACPI_ERROR((AE_INFO, 388 "No init routine for region(%p) [%s]", 389 region_obj, 390 acpi_ut_get_region_name(region_obj->region. 391 space_id))); 392 return_ACPI_STATUS(AE_NOT_EXIST); 393 } 394 395 /* 396 * We must exit the interpreter because the region setup will 397 * potentially execute control methods (for example, the _REG method 398 * for this region) 399 */ 400 acpi_ex_exit_interpreter(); 401 402 status = region_setup(region_obj, ACPI_REGION_ACTIVATE, 403 handler_desc->address_space.context, 404 ®ion_context); 405 406 /* Re-enter the interpreter */ 407 408 acpi_ex_enter_interpreter(); 409 410 /* Check for failure of the Region Setup */ 411 412 if (ACPI_FAILURE(status)) { 413 ACPI_EXCEPTION((AE_INFO, status, 414 "During region initialization: [%s]", 415 acpi_ut_get_region_name(region_obj-> 416 region. 417 space_id))); 418 return_ACPI_STATUS(status); 419 } 420 421 /* Region initialization may have been completed by region_setup */ 422 423 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) { 424 region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE; 425 426 if (region_obj2->extra.region_context) { 427 428 /* The handler for this region was already installed */ 429 430 ACPI_FREE(region_context); 431 } else { 432 /* 433 * Save the returned context for use in all accesses to 434 * this particular region 435 */ 436 region_obj2->extra.region_context = 437 region_context; 438 } 439 } 440 } 441 442 /* We have everything we need, we can invoke the address space handler */ 443 444 handler = handler_desc->address_space.handler; 445 446 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 447 "Handler %p (@%p) Address %8.8X%8.8X [%s]\n", 448 ®ion_obj->region.handler->address_space, handler, 449 ACPI_FORMAT_NATIVE_UINT(region_obj->region.address + 450 region_offset), 451 acpi_ut_get_region_name(region_obj->region. 452 space_id))); 453 454 if (!(handler_desc->address_space.handler_flags & 455 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) { 456 /* 457 * For handlers other than the default (supplied) handlers, we must 458 * exit the interpreter because the handler *might* block -- we don't 459 * know what it will do, so we can't hold the lock on the intepreter. 460 */ 461 acpi_ex_exit_interpreter(); 462 } 463 464 /* Call the handler */ 465 466 status = handler(function, 467 (region_obj->region.address + region_offset), 468 bit_width, value, handler_desc->address_space.context, 469 region_obj2->extra.region_context); 470 471 if (ACPI_FAILURE(status)) { 472 ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]", 473 acpi_ut_get_region_name(region_obj->region. 474 space_id))); 475 } 476 477 if (!(handler_desc->address_space.handler_flags & 478 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) { 479 /* 480 * We just returned from a non-default handler, we must re-enter the 481 * interpreter 482 */ 483 acpi_ex_enter_interpreter(); 484 } 485 486 return_ACPI_STATUS(status); 487} 488 489/******************************************************************************* 490 * 491 * FUNCTION: acpi_ev_detach_region 492 * 493 * PARAMETERS: region_obj - Region Object 494 * acpi_ns_is_locked - Namespace Region Already Locked? 495 * 496 * RETURN: None 497 * 498 * DESCRIPTION: Break the association between the handler and the region 499 * this is a two way association. 500 * 501 ******************************************************************************/ 502 503void 504acpi_ev_detach_region(union acpi_operand_object *region_obj, 505 u8 acpi_ns_is_locked) 506{ 507 union acpi_operand_object *handler_obj; 508 union acpi_operand_object *obj_desc; 509 union acpi_operand_object **last_obj_ptr; 510 acpi_adr_space_setup region_setup; 511 void **region_context; 512 union acpi_operand_object *region_obj2; 513 acpi_status status; 514 515 ACPI_FUNCTION_TRACE(ev_detach_region); 516 517 region_obj2 = acpi_ns_get_secondary_object(region_obj); 518 if (!region_obj2) { 519 return_VOID; 520 } 521 region_context = ®ion_obj2->extra.region_context; 522 523 /* Get the address handler from the region object */ 524 525 handler_obj = region_obj->region.handler; 526 if (!handler_obj) { 527 528 /* This region has no handler, all done */ 529 530 return_VOID; 531 } 532 533 /* Find this region in the handler's list */ 534 535 obj_desc = handler_obj->address_space.region_list; 536 last_obj_ptr = &handler_obj->address_space.region_list; 537 538 while (obj_desc) { 539 540 /* Is this the correct Region? */ 541 542 if (obj_desc == region_obj) { 543 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 544 "Removing Region %p from address handler %p\n", 545 region_obj, handler_obj)); 546 547 /* This is it, remove it from the handler's list */ 548 549 *last_obj_ptr = obj_desc->region.next; 550 obj_desc->region.next = NULL; /* Must clear field */ 551 552 if (acpi_ns_is_locked) { 553 status = 554 acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 555 if (ACPI_FAILURE(status)) { 556 return_VOID; 557 } 558 } 559 560 /* Now stop region accesses by executing the _REG method */ 561 562 status = acpi_ev_execute_reg_method(region_obj, 0); 563 if (ACPI_FAILURE(status)) { 564 ACPI_EXCEPTION((AE_INFO, status, 565 "from region _REG, [%s]", 566 acpi_ut_get_region_name 567 (region_obj->region.space_id))); 568 } 569 570 if (acpi_ns_is_locked) { 571 status = 572 acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 573 if (ACPI_FAILURE(status)) { 574 return_VOID; 575 } 576 } 577 578 /* 579 * If the region has been activated, call the setup handler with 580 * the deactivate notification 581 */ 582 if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) { 583 region_setup = handler_obj->address_space.setup; 584 status = 585 region_setup(region_obj, 586 ACPI_REGION_DEACTIVATE, 587 handler_obj->address_space. 588 context, region_context); 589 590 /* Init routine may fail, Just ignore errors */ 591 592 if (ACPI_FAILURE(status)) { 593 ACPI_EXCEPTION((AE_INFO, status, 594 "from region handler - deactivate, [%s]", 595 acpi_ut_get_region_name 596 (region_obj->region. 597 space_id))); 598 } 599 600 region_obj->region.flags &= 601 ~(AOPOBJ_SETUP_COMPLETE); 602 } 603 604 /* 605 * Remove handler reference in the region 606 * 607 * NOTE: this doesn't mean that the region goes away, the region 608 * is just inaccessible as indicated to the _REG method 609 * 610 * If the region is on the handler's list, this must be the 611 * region's handler 612 */ 613 region_obj->region.handler = NULL; 614 acpi_ut_remove_reference(handler_obj); 615 616 return_VOID; 617 } 618 619 /* Walk the linked list of handlers */ 620 621 last_obj_ptr = &obj_desc->region.next; 622 obj_desc = obj_desc->region.next; 623 } 624 625 /* If we get here, the region was not in the handler's region list */ 626 627 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 628 "Cannot remove region %p from address handler %p\n", 629 region_obj, handler_obj)); 630 631 return_VOID; 632} 633 634/******************************************************************************* 635 * 636 * FUNCTION: acpi_ev_attach_region 637 * 638 * PARAMETERS: handler_obj - Handler Object 639 * region_obj - Region Object 640 * acpi_ns_is_locked - Namespace Region Already Locked? 641 * 642 * RETURN: None 643 * 644 * DESCRIPTION: Create the association between the handler and the region 645 * this is a two way association. 646 * 647 ******************************************************************************/ 648 649acpi_status 650acpi_ev_attach_region(union acpi_operand_object *handler_obj, 651 union acpi_operand_object *region_obj, 652 u8 acpi_ns_is_locked) 653{ 654 655 ACPI_FUNCTION_TRACE(ev_attach_region); 656 657 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 658 "Adding Region [%4.4s] %p to address handler %p [%s]\n", 659 acpi_ut_get_node_name(region_obj->region.node), 660 region_obj, handler_obj, 661 acpi_ut_get_region_name(region_obj->region. 662 space_id))); 663 664 /* Link this region to the front of the handler's list */ 665 666 region_obj->region.next = handler_obj->address_space.region_list; 667 handler_obj->address_space.region_list = region_obj; 668 669 /* Install the region's handler */ 670 671 if (region_obj->region.handler) { 672 return_ACPI_STATUS(AE_ALREADY_EXISTS); 673 } 674 675 region_obj->region.handler = handler_obj; 676 acpi_ut_add_reference(handler_obj); 677 678 return_ACPI_STATUS(AE_OK); 679} 680 681/******************************************************************************* 682 * 683 * FUNCTION: acpi_ev_install_handler 684 * 685 * PARAMETERS: walk_namespace callback 686 * 687 * DESCRIPTION: This routine installs an address handler into objects that are 688 * of type Region or Device. 689 * 690 * If the Object is a Device, and the device has a handler of 691 * the same type then the search is terminated in that branch. 692 * 693 * This is because the existing handler is closer in proximity 694 * to any more regions than the one we are trying to install. 695 * 696 ******************************************************************************/ 697 698static acpi_status 699acpi_ev_install_handler(acpi_handle obj_handle, 700 u32 level, void *context, void **return_value) 701{ 702 union acpi_operand_object *handler_obj; 703 union acpi_operand_object *next_handler_obj; 704 union acpi_operand_object *obj_desc; 705 struct acpi_namespace_node *node; 706 acpi_status status; 707 708 ACPI_FUNCTION_NAME(ev_install_handler); 709 710 handler_obj = (union acpi_operand_object *)context; 711 712 /* Parameter validation */ 713 714 if (!handler_obj) { 715 return (AE_OK); 716 } 717 718 /* Convert and validate the device handle */ 719 720 node = acpi_ns_validate_handle(obj_handle); 721 if (!node) { 722 return (AE_BAD_PARAMETER); 723 } 724 725 /* 726 * We only care about regions and objects that are allowed to have 727 * address space handlers 728 */ 729 if ((node->type != ACPI_TYPE_DEVICE) && 730 (node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) { 731 return (AE_OK); 732 } 733 734 /* Check for an existing internal object */ 735 736 obj_desc = acpi_ns_get_attached_object(node); 737 if (!obj_desc) { 738 739 /* No object, just exit */ 740 741 return (AE_OK); 742 } 743 744 /* Devices are handled different than regions */ 745 746 if (obj_desc->common.type == ACPI_TYPE_DEVICE) { 747 748 /* Check if this Device already has a handler for this address space */ 749 750 next_handler_obj = obj_desc->device.handler; 751 while (next_handler_obj) { 752 753 /* Found a handler, is it for the same address space? */ 754 755 if (next_handler_obj->address_space.space_id == 756 handler_obj->address_space.space_id) { 757 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 758 "Found handler for region [%s] in device %p(%p) " 759 "handler %p\n", 760 acpi_ut_get_region_name 761 (handler_obj->address_space. 762 space_id), obj_desc, 763 next_handler_obj, 764 handler_obj)); 765 766 /* 767 * Since the object we found it on was a device, then it 768 * means that someone has already installed a handler for 769 * the branch of the namespace from this device on. Just 770 * bail out telling the walk routine to not traverse this 771 * branch. This preserves the scoping rule for handlers. 772 */ 773 return (AE_CTRL_DEPTH); 774 } 775 776 /* Walk the linked list of handlers attached to this device */ 777 778 next_handler_obj = next_handler_obj->address_space.next; 779 } 780 781 /* 782 * As long as the device didn't have a handler for this space we 783 * don't care about it. We just ignore it and proceed. 784 */ 785 return (AE_OK); 786 } 787 788 /* Object is a Region */ 789 790 if (obj_desc->region.space_id != handler_obj->address_space.space_id) { 791 792 /* This region is for a different address space, just ignore it */ 793 794 return (AE_OK); 795 } 796 797 /* 798 * Now we have a region and it is for the handler's address space type. 799 * 800 * First disconnect region for any previous handler (if any) 801 */ 802 acpi_ev_detach_region(obj_desc, FALSE); 803 804 /* Connect the region to the new handler */ 805 806 status = acpi_ev_attach_region(handler_obj, obj_desc, FALSE); 807 return (status); 808} 809 810/******************************************************************************* 811 * 812 * FUNCTION: acpi_ev_install_space_handler 813 * 814 * PARAMETERS: Node - Namespace node for the device 815 * space_id - The address space ID 816 * Handler - Address of the handler 817 * Setup - Address of the setup function 818 * Context - Value passed to the handler on each access 819 * 820 * RETURN: Status 821 * 822 * DESCRIPTION: Install a handler for all op_regions of a given space_id. 823 * Assumes namespace is locked 824 * 825 ******************************************************************************/ 826 827acpi_status 828acpi_ev_install_space_handler(struct acpi_namespace_node * node, 829 acpi_adr_space_type space_id, 830 acpi_adr_space_handler handler, 831 acpi_adr_space_setup setup, void *context) 832{ 833 union acpi_operand_object *obj_desc; 834 union acpi_operand_object *handler_obj; 835 acpi_status status; 836 acpi_object_type type; 837 u8 flags = 0; 838 839 ACPI_FUNCTION_TRACE(ev_install_space_handler); 840 841 /* 842 * This registration is valid for only the types below and the root. This 843 * is where the default handlers get placed. 844 */ 845 if ((node->type != ACPI_TYPE_DEVICE) && 846 (node->type != ACPI_TYPE_PROCESSOR) && 847 (node->type != ACPI_TYPE_THERMAL) && (node != acpi_gbl_root_node)) { 848 status = AE_BAD_PARAMETER; 849 goto unlock_and_exit; 850 } 851 852 if (handler == ACPI_DEFAULT_HANDLER) { 853 flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED; 854 855 switch (space_id) { 856 case ACPI_ADR_SPACE_SYSTEM_MEMORY: 857 handler = acpi_ex_system_memory_space_handler; 858 setup = acpi_ev_system_memory_region_setup; 859 break; 860 861 case ACPI_ADR_SPACE_SYSTEM_IO: 862 handler = acpi_ex_system_io_space_handler; 863 setup = acpi_ev_io_space_region_setup; 864 break; 865 866 case ACPI_ADR_SPACE_PCI_CONFIG: 867 handler = acpi_ex_pci_config_space_handler; 868 setup = acpi_ev_pci_config_region_setup; 869 break; 870 871 case ACPI_ADR_SPACE_CMOS: 872 handler = acpi_ex_cmos_space_handler; 873 setup = acpi_ev_cmos_region_setup; 874 break; 875 876 case ACPI_ADR_SPACE_PCI_BAR_TARGET: 877 handler = acpi_ex_pci_bar_space_handler; 878 setup = acpi_ev_pci_bar_region_setup; 879 break; 880 881 case ACPI_ADR_SPACE_DATA_TABLE: 882 handler = acpi_ex_data_table_space_handler; 883 setup = NULL; 884 break; 885 886 default: 887 status = AE_BAD_PARAMETER; 888 goto unlock_and_exit; 889 } 890 } 891 892 /* If the caller hasn't specified a setup routine, use the default */ 893 894 if (!setup) { 895 setup = acpi_ev_default_region_setup; 896 } 897 898 /* Check for an existing internal object */ 899 900 obj_desc = acpi_ns_get_attached_object(node); 901 if (obj_desc) { 902 /* 903 * The attached device object already exists. Make sure the handler 904 * is not already installed. 905 */ 906 handler_obj = obj_desc->device.handler; 907 908 /* Walk the handler list for this device */ 909 910 while (handler_obj) { 911 912 /* Same space_id indicates a handler already installed */ 913 914 if (handler_obj->address_space.space_id == space_id) { 915 if (handler_obj->address_space.handler == 916 handler) { 917 /* 918 * It is (relatively) OK to attempt to install the SAME 919 * handler twice. This can easily happen with the 920 * PCI_Config space. 921 */ 922 status = AE_SAME_HANDLER; 923 goto unlock_and_exit; 924 } else { 925 /* A handler is already installed */ 926 927 status = AE_ALREADY_EXISTS; 928 } 929 goto unlock_and_exit; 930 } 931 932 /* Walk the linked list of handlers */ 933 934 handler_obj = handler_obj->address_space.next; 935 } 936 } else { 937 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 938 "Creating object on Device %p while installing handler\n", 939 node)); 940 941 /* obj_desc does not exist, create one */ 942 943 if (node->type == ACPI_TYPE_ANY) { 944 type = ACPI_TYPE_DEVICE; 945 } else { 946 type = node->type; 947 } 948 949 obj_desc = acpi_ut_create_internal_object(type); 950 if (!obj_desc) { 951 status = AE_NO_MEMORY; 952 goto unlock_and_exit; 953 } 954 955 /* Init new descriptor */ 956 957 obj_desc->common.type = (u8) type; 958 959 /* Attach the new object to the Node */ 960 961 status = acpi_ns_attach_object(node, obj_desc, type); 962 963 /* Remove local reference to the object */ 964 965 acpi_ut_remove_reference(obj_desc); 966 967 if (ACPI_FAILURE(status)) { 968 goto unlock_and_exit; 969 } 970 } 971 972 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 973 "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n", 974 acpi_ut_get_region_name(space_id), space_id, 975 acpi_ut_get_node_name(node), node, obj_desc)); 976 977 /* 978 * Install the handler 979 * 980 * At this point there is no existing handler. Just allocate the object 981 * for the handler and link it into the list. 982 */ 983 handler_obj = 984 acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_ADDRESS_HANDLER); 985 if (!handler_obj) { 986 status = AE_NO_MEMORY; 987 goto unlock_and_exit; 988 } 989 990 /* Init handler obj */ 991 992 handler_obj->address_space.space_id = (u8) space_id; 993 handler_obj->address_space.handler_flags = flags; 994 handler_obj->address_space.region_list = NULL; 995 handler_obj->address_space.node = node; 996 handler_obj->address_space.handler = handler; 997 handler_obj->address_space.context = context; 998 handler_obj->address_space.setup = setup; 999 1000 /* Install at head of Device.address_space list */ 1001 1002 handler_obj->address_space.next = obj_desc->device.handler; 1003 1004 /* 1005 * The Device object is the first reference on the handler_obj. 1006 * Each region that uses the handler adds a reference. 1007 */ 1008 obj_desc->device.handler = handler_obj; 1009 1010 /* 1011 * Walk the namespace finding all of the regions this 1012 * handler will manage. 1013 * 1014 * Start at the device and search the branch toward 1015 * the leaf nodes until either the leaf is encountered or 1016 * a device is detected that has an address handler of the 1017 * same type. 1018 * 1019 * In either case, back up and search down the remainder 1020 * of the branch 1021 */ 1022 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX, 1023 ACPI_NS_WALK_UNLOCK, 1024 acpi_ev_install_handler, NULL, 1025 handler_obj, NULL); 1026 1027 unlock_and_exit: 1028 return_ACPI_STATUS(status); 1029} 1030 1031/******************************************************************************* 1032 * 1033 * FUNCTION: acpi_ev_execute_reg_methods 1034 * 1035 * PARAMETERS: Node - Namespace node for the device 1036 * space_id - The address space ID 1037 * 1038 * RETURN: Status 1039 * 1040 * DESCRIPTION: Run all _REG methods for the input Space ID; 1041 * Note: assumes namespace is locked, or system init time. 1042 * 1043 ******************************************************************************/ 1044 1045acpi_status 1046acpi_ev_execute_reg_methods(struct acpi_namespace_node *node, 1047 acpi_adr_space_type space_id) 1048{ 1049 acpi_status status; 1050 1051 ACPI_FUNCTION_TRACE(ev_execute_reg_methods); 1052 1053 /* 1054 * Run all _REG methods for all Operation Regions for this space ID. This 1055 * is a separate walk in order to handle any interdependencies between 1056 * regions and _REG methods. (i.e. handlers must be installed for all 1057 * regions of this Space ID before we can run any _REG methods) 1058 */ 1059 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX, 1060 ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run, 1061 NULL, &space_id, NULL); 1062 1063 return_ACPI_STATUS(status); 1064} 1065 1066/******************************************************************************* 1067 * 1068 * FUNCTION: acpi_ev_reg_run 1069 * 1070 * PARAMETERS: walk_namespace callback 1071 * 1072 * DESCRIPTION: Run _REG method for region objects of the requested space_iD 1073 * 1074 ******************************************************************************/ 1075 1076static acpi_status 1077acpi_ev_reg_run(acpi_handle obj_handle, 1078 u32 level, void *context, void **return_value) 1079{ 1080 union acpi_operand_object *obj_desc; 1081 struct acpi_namespace_node *node; 1082 acpi_adr_space_type space_id; 1083 acpi_status status; 1084 1085 space_id = *ACPI_CAST_PTR(acpi_adr_space_type, context); 1086 1087 /* Convert and validate the device handle */ 1088 1089 node = acpi_ns_validate_handle(obj_handle); 1090 if (!node) { 1091 return (AE_BAD_PARAMETER); 1092 } 1093 1094 /* 1095 * We only care about regions.and objects that are allowed to have address 1096 * space handlers 1097 */ 1098 if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) { 1099 return (AE_OK); 1100 } 1101 1102 /* Check for an existing internal object */ 1103 1104 obj_desc = acpi_ns_get_attached_object(node); 1105 if (!obj_desc) { 1106 1107 /* No object, just exit */ 1108 1109 return (AE_OK); 1110 } 1111 1112 /* Object is a Region */ 1113 1114 if (obj_desc->region.space_id != space_id) { 1115 1116 /* This region is for a different address space, just ignore it */ 1117 1118 return (AE_OK); 1119 } 1120 1121 status = acpi_ev_execute_reg_method(obj_desc, 1); 1122 return (status); 1123} 1124