git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/events/evregion.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evregion - ACPI address_space (op_region) handler dispatch
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, 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 <acpi/accommon.h>
  46 #include <acpi/acevents.h>
  47 #include <acpi/acnamesp.h>
  48 #include <acpi/acinterp.h>
  49
  50 #define _COMPONENT          ACPI_EVENTS
  51 ACPI_MODULE_NAME("evregion")
  52
  53 /* Local prototypes */
  54 static acpi_status
  55 acpi_ev_reg_run(acpi_handle obj_handle,
  56                 u32 level, void *context, void **return_value);
  57
  58 static acpi_status
  59 acpi_ev_install_handler(acpi_handle obj_handle,
  60                         u32 level, void *context, void **return_value);
  61
  62 /* These are the address spaces that will get default handlers */
  63
  64 #define ACPI_NUM_DEFAULT_SPACES     4
  65
  66 static u8 acpi_gbl_default_address_spaces[ACPI_NUM_DEFAULT_SPACES] = {
  67         ACPI_ADR_SPACE_SYSTEM_MEMORY,
  68         ACPI_ADR_SPACE_SYSTEM_IO,
  69         ACPI_ADR_SPACE_PCI_CONFIG,
  70         ACPI_ADR_SPACE_DATA_TABLE
  71 };
  72
  73 /*******************************************************************************
  74  *
  75  * FUNCTION:    acpi_ev_install_region_handlers
  76  *
  77  * PARAMETERS:  None
  78  *
  79  * RETURN:      Status
  80  *
  81  * DESCRIPTION: Installs the core subsystem default address space handlers.
  82  *
  83  ******************************************************************************/
  84
  85 acpi_status acpi_ev_install_region_handlers(void)
  86 {
  87         acpi_status status;
  88         u32 i;
  89
  90         ACPI_FUNCTION_TRACE(ev_install_region_handlers);
  91
  92         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  93         if (ACPI_FAILURE(status)) {
  94                 return_ACPI_STATUS(status);
  95         }
  96
  97         /*
  98          * All address spaces (PCI Config, EC, SMBus) are scope dependent and
  99          * registration must occur for a specific device.
 100          *
 101          * In the case of the system memory and IO address spaces there is
 102          * currently no device associated with the address space. For these we
 103          * use the root.
 104          *
 105          * We install the default PCI config space handler at the root so that
 106          * this space is immediately available even though the we have not
 107          * enumerated all the PCI Root Buses yet. This is to conform to the ACPI
 108          * specification which states that the PCI config space must be always
 109          * available -- even though we are nowhere near ready to find the PCI root
 110          * buses at this point.
 111          *
 112          * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler
 113          * has already been installed (via acpi_install_address_space_handler).
 114          * Similar for AE_SAME_HANDLER.
 115          */
 116         for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
 117                 status = acpi_ev_install_space_handler(acpi_gbl_root_node,
 118                                                        acpi_gbl_default_address_spaces
 119                                                        [i],
 120                                                        ACPI_DEFAULT_HANDLER,
 121                                                        NULL, NULL);
 122                 switch (status) {
 123                 case AE_OK:
 124                 case AE_SAME_HANDLER:
 125                 case AE_ALREADY_EXISTS:
 126
 127                         /* These exceptions are all OK */
 128
 129                         status = AE_OK;
 130                         break;
 131
 132                 default:
 133
 134                         goto unlock_and_exit;
 135                 }
 136         }
 137
 138       unlock_and_exit:
 139         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 140         return_ACPI_STATUS(status);
 141 }
 142
 143 /*******************************************************************************
 144  *
 145  * FUNCTION:    acpi_ev_initialize_op_regions
 146  *
 147  * PARAMETERS:  None
 148  *
 149  * RETURN:      Status
 150  *
 151  * DESCRIPTION: Execute _REG methods for all Operation Regions that have
 152  *              an installed default region handler.
 153  *
 154  ******************************************************************************/
 155
 156 acpi_status acpi_ev_initialize_op_regions(void)
 157 {
 158         acpi_status status;
 159         u32 i;
 160
 161         ACPI_FUNCTION_TRACE(ev_initialize_op_regions);
 162
 163         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 164         if (ACPI_FAILURE(status)) {
 165                 return_ACPI_STATUS(status);
 166         }
 167
 168         /* Run the _REG methods for op_regions in each default address space */
 169
 170         for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
 171                 /*
 172                  * TBD: Make sure handler is the DEFAULT handler, otherwise
 173                  * _REG will have already been run.
 174                  */
 175                 status = acpi_ev_execute_reg_methods(acpi_gbl_root_node,
 176                                                      acpi_gbl_default_address_spaces
 177                                                      [i]);
 178         }
 179
 180         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 181         return_ACPI_STATUS(status);
 182 }
 183
 184 /*******************************************************************************
 185  *
 186  * FUNCTION:    acpi_ev_execute_reg_method
 187  *
 188  * PARAMETERS:  region_obj          - Region object
 189  *              Function            - Passed to _REG: On (1) or Off (0)
 190  *
 191  * RETURN:      Status
 192  *
 193  * DESCRIPTION: Execute _REG method for a region
 194  *
 195  ******************************************************************************/
 196
 197 acpi_status
 198 acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
 199 {
 200         struct acpi_evaluate_info *info;
 201         union acpi_operand_object *args[3];
 202         union acpi_operand_object *region_obj2;
 203         acpi_status status;
 204
 205         ACPI_FUNCTION_TRACE(ev_execute_reg_method);
 206
 207         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 208         if (!region_obj2) {
 209                 return_ACPI_STATUS(AE_NOT_EXIST);
 210         }
 211
 212         if (region_obj2->extra.method_REG == NULL) {
 213                 return_ACPI_STATUS(AE_OK);
 214         }
 215
 216         /* Allocate and initialize the evaluation information block */
 217
 218         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 219         if (!info) {
 220                 return_ACPI_STATUS(AE_NO_MEMORY);
 221         }
 222
 223         info->prefix_node = region_obj2->extra.method_REG;
 224         info->pathname = NULL;
 225         info->parameters = args;
 226         info->flags = ACPI_IGNORE_RETURN_VALUE;
 227
 228         /*
 229          * The _REG method has two arguments:
 230          *
 231          * Arg0 - Integer:
 232          *  Operation region space ID Same value as region_obj->Region.space_id
 233          *
 234          * Arg1 - Integer:
 235          *  connection status 1 for connecting the handler, 0 for disconnecting
 236          *  the handler (Passed as a parameter)
 237          */
 238         args[0] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 239         if (!args[0]) {
 240                 status = AE_NO_MEMORY;
 241                 goto cleanup1;
 242         }
 243
 244         args[1] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 245         if (!args[1]) {
 246                 status = AE_NO_MEMORY;
 247                 goto cleanup2;
 248         }
 249
 250         /* Setup the parameter objects */
 251
 252         args[0]->integer.value = region_obj->region.space_id;
 253         args[1]->integer.value = function;
 254         args[2] = NULL;
 255
 256         /* Execute the method, no return value */
 257
 258         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 259                         (ACPI_TYPE_METHOD, info->prefix_node, NULL));
 260
 261         status = acpi_ns_evaluate(info);
 262         acpi_ut_remove_reference(args[1]);
 263
 264       cleanup2:
 265         acpi_ut_remove_reference(args[0]);
 266
 267       cleanup1:
 268         ACPI_FREE(info);
 269         return_ACPI_STATUS(status);
 270 }
 271
 272 /*******************************************************************************
 273  *
 274  * FUNCTION:    acpi_ev_address_space_dispatch
 275  *
 276  * PARAMETERS:  region_obj          - Internal region object
 277  *              Function            - Read or Write operation
 278  *              Address             - Where in the space to read or write
 279  *              bit_width           - Field width in bits (8, 16, 32, or 64)
 280  *              Value               - Pointer to in or out value, must be
 281  *                                    full 64-bit acpi_integer
 282  *
 283  * RETURN:      Status
 284  *
 285  * DESCRIPTION: Dispatch an address space or operation region access to
 286  *              a previously installed handler.
 287  *
 288  ******************************************************************************/
 289
 290 acpi_status
 291 acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
 292                                u32 function,
 293                                acpi_physical_address address,
 294                                u32 bit_width, acpi_integer * value)
 295 {
 296         acpi_status status;
 297         acpi_adr_space_handler handler;
 298         acpi_adr_space_setup region_setup;
 299         union acpi_operand_object *handler_desc;
 300         union acpi_operand_object *region_obj2;
 301         void *region_context = NULL;
 302
 303         ACPI_FUNCTION_TRACE(ev_address_space_dispatch);
 304
 305         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 306         if (!region_obj2) {
 307                 return_ACPI_STATUS(AE_NOT_EXIST);
 308         }
 309
 310         /* Ensure that there is a handler associated with this region */
 311
 312         handler_desc = region_obj->region.handler;
 313         if (!handler_desc) {
 314                 ACPI_ERROR((AE_INFO,
 315                             "No handler for Region [%4.4s] (%p) [%s]",
 316                             acpi_ut_get_node_name(region_obj->region.node),
 317                             region_obj,
 318                             acpi_ut_get_region_name(region_obj->region.
 319                                                     space_id)));
 320
 321                 return_ACPI_STATUS(AE_NOT_EXIST);
 322         }
 323
 324         /*
 325          * It may be the case that the region has never been initialized.
 326          * Some types of regions require special init code
 327          */
 328         if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
 329
 330                 /* This region has not been initialized yet, do it */
 331
 332                 region_setup = handler_desc->address_space.setup;
 333                 if (!region_setup) {
 334
 335                         /* No initialization routine, exit with error */
 336
 337                         ACPI_ERROR((AE_INFO,
 338                                     "No init routine for region(%p) [%s]",
 339                                     region_obj,
 340                                     acpi_ut_get_region_name(region_obj->region.
 341                                                             space_id)));
 342                         return_ACPI_STATUS(AE_NOT_EXIST);
 343                 }
 344
 345                 /*
 346                  * We must exit the interpreter because the region setup will
 347                  * potentially execute control methods (for example, the _REG method
 348                  * for this region)
 349                  */
 350                 acpi_ex_exit_interpreter();
 351
 352                 status = region_setup(region_obj, ACPI_REGION_ACTIVATE,
 353                                       handler_desc->address_space.context,
 354                                       &region_context);
 355
 356                 /* Re-enter the interpreter */
 357
 358                 acpi_ex_enter_interpreter();
 359
 360                 /* Check for failure of the Region Setup */
 361
 362                 if (ACPI_FAILURE(status)) {
 363                         ACPI_EXCEPTION((AE_INFO, status,
 364                                         "During region initialization: [%s]",
 365                                         acpi_ut_get_region_name(region_obj->
 366                                                                 region.
 367                                                                 space_id)));
 368                         return_ACPI_STATUS(status);
 369                 }
 370
 371                 /* Region initialization may have been completed by region_setup */
 372
 373                 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
 374                         region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
 375
 376                         if (region_obj2->extra.region_context) {
 377
 378                                 /* The handler for this region was already installed */
 379
 380                                 ACPI_FREE(region_context);
 381                         } else {
 382                                 /*
 383                                  * Save the returned context for use in all accesses to
 384                                  * this particular region
 385                                  */
 386                                 region_obj2->extra.region_context =
 387                                     region_context;
 388                         }
 389                 }
 390         }
 391
 392         /* We have everything we need, we can invoke the address space handler */
 393
 394         handler = handler_desc->address_space.handler;
 395
 396         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 397                           "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
 398                           &region_obj->region.handler->address_space, handler,
 399                           ACPI_FORMAT_NATIVE_UINT(address),
 400                           acpi_ut_get_region_name(region_obj->region.
 401                                                   space_id)));
 402
 403         if (!(handler_desc->address_space.handler_flags &
 404               ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
 405                 /*
 406                  * For handlers other than the default (supplied) handlers, we must
 407                  * exit the interpreter because the handler *might* block -- we don't
 408                  * know what it will do, so we can't hold the lock on the intepreter.
 409                  */
 410                 acpi_ex_exit_interpreter();
 411         }
 412
 413         /* Call the handler */
 414
 415         status = handler(function, address, bit_width, value,
 416                          handler_desc->address_space.context,
 417                          region_obj2->extra.region_context);
 418
 419         if (ACPI_FAILURE(status)) {
 420                 ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]",
 421                                 acpi_ut_get_region_name(region_obj->region.
 422                                                         space_id)));
 423         }
 424
 425         if (!(handler_desc->address_space.handler_flags &
 426               ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
 427                 /*
 428                  * We just returned from a non-default handler, we must re-enter the
 429                  * interpreter
 430                  */
 431                 acpi_ex_enter_interpreter();
 432         }
 433
 434         return_ACPI_STATUS(status);
 435 }
 436
 437 /*******************************************************************************
 438  *
 439  * FUNCTION:    acpi_ev_detach_region
 440  *
 441  * PARAMETERS:  region_obj          - Region Object
 442  *              acpi_ns_is_locked   - Namespace Region Already Locked?
 443  *
 444  * RETURN:      None
 445  *
 446  * DESCRIPTION: Break the association between the handler and the region
 447  *              this is a two way association.
 448  *
 449  ******************************************************************************/
 450
 451 void
 452 acpi_ev_detach_region(union acpi_operand_object *region_obj,
 453                       u8 acpi_ns_is_locked)
 454 {
 455         union acpi_operand_object *handler_obj;
 456         union acpi_operand_object *obj_desc;
 457         union acpi_operand_object **last_obj_ptr;
 458         acpi_adr_space_setup region_setup;
 459         void **region_context;
 460         union acpi_operand_object *region_obj2;
 461         acpi_status status;
 462
 463         ACPI_FUNCTION_TRACE(ev_detach_region);
 464
 465         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 466         if (!region_obj2) {
 467                 return_VOID;
 468         }
 469         region_context = &region_obj2->extra.region_context;
 470
 471         /* Get the address handler from the region object */
 472
 473         handler_obj = region_obj->region.handler;
 474         if (!handler_obj) {
 475
 476                 /* This region has no handler, all done */
 477
 478                 return_VOID;
 479         }
 480
 481         /* Find this region in the handler's list */
 482
 483         obj_desc = handler_obj->address_space.region_list;
 484         last_obj_ptr = &handler_obj->address_space.region_list;
 485
 486         while (obj_desc) {
 487
 488                 /* Is this the correct Region? */
 489
 490                 if (obj_desc == region_obj) {
 491                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 492                                           "Removing Region %p from address handler %p\n",
 493                                           region_obj, handler_obj));
 494
 495                         /* This is it, remove it from the handler's list */
 496
 497                         *last_obj_ptr = obj_desc->region.next;
 498                         obj_desc->region.next = NULL;   /* Must clear field */
 499
 500                         if (acpi_ns_is_locked) {
 501                                 status =
 502                                     acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 503                                 if (ACPI_FAILURE(status)) {
 504                                         return_VOID;
 505                                 }
 506                         }
 507
 508                         /* Now stop region accesses by executing the _REG method */
 509
 510                         status = acpi_ev_execute_reg_method(region_obj, 0);
 511                         if (ACPI_FAILURE(status)) {
 512                                 ACPI_EXCEPTION((AE_INFO, status,
 513                                                 "from region _REG, [%s]",
 514                                                 acpi_ut_get_region_name
 515                                                 (region_obj->region.space_id)));
 516                         }
 517
 518                         if (acpi_ns_is_locked) {
 519                                 status =
 520                                     acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 521                                 if (ACPI_FAILURE(status)) {
 522                                         return_VOID;
 523                                 }
 524                         }
 525
 526                         /*
 527                          * If the region has been activated, call the setup handler with
 528                          * the deactivate notification
 529                          */
 530                         if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
 531                                 region_setup = handler_obj->address_space.setup;
 532                                 status =
 533                                     region_setup(region_obj,
 534                                                  ACPI_REGION_DEACTIVATE,
 535                                                  handler_obj->address_space.
 536                                                  context, region_context);
 537
 538                                 /* Init routine may fail, Just ignore errors */
 539
 540                                 if (ACPI_FAILURE(status)) {
 541                                         ACPI_EXCEPTION((AE_INFO, status,
 542                                                         "from region handler - deactivate, [%s]",
 543                                                         acpi_ut_get_region_name
 544                                                         (region_obj->region.
 545                                                          space_id)));
 546                                 }
 547
 548                                 region_obj->region.flags &=
 549                                     ~(AOPOBJ_SETUP_COMPLETE);
 550                         }
 551
 552                         /*
 553                          * Remove handler reference in the region
 554                          *
 555                          * NOTE: this doesn't mean that the region goes away, the region
 556                          * is just inaccessible as indicated to the _REG method
 557                          *
 558                          * If the region is on the handler's list, this must be the
 559                          * region's handler
 560                          */
 561                         region_obj->region.handler = NULL;
 562                         acpi_ut_remove_reference(handler_obj);
 563
 564                         return_VOID;
 565                 }
 566
 567                 /* Walk the linked list of handlers */
 568
 569                 last_obj_ptr = &obj_desc->region.next;
 570                 obj_desc = obj_desc->region.next;
 571         }
 572
 573         /* If we get here, the region was not in the handler's region list */
 574
 575         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 576                           "Cannot remove region %p from address handler %p\n",
 577                           region_obj, handler_obj));
 578
 579         return_VOID;
 580 }
 581
 582 /*******************************************************************************
 583  *
 584  * FUNCTION:    acpi_ev_attach_region
 585  *
 586  * PARAMETERS:  handler_obj         - Handler Object
 587  *              region_obj          - Region Object
 588  *              acpi_ns_is_locked   - Namespace Region Already Locked?
 589  *
 590  * RETURN:      None
 591  *
 592  * DESCRIPTION: Create the association between the handler and the region
 593  *              this is a two way association.
 594  *
 595  ******************************************************************************/
 596
 597 acpi_status
 598 acpi_ev_attach_region(union acpi_operand_object *handler_obj,
 599                       union acpi_operand_object *region_obj,
 600                       u8 acpi_ns_is_locked)
 601 {
 602
 603         ACPI_FUNCTION_TRACE(ev_attach_region);
 604
 605         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 606                           "Adding Region [%4.4s] %p to address handler %p [%s]\n",
 607                           acpi_ut_get_node_name(region_obj->region.node),
 608                           region_obj, handler_obj,
 609                           acpi_ut_get_region_name(region_obj->region.
 610                                                   space_id)));
 611
 612         /* Link this region to the front of the handler's list */
 613
 614         region_obj->region.next = handler_obj->address_space.region_list;
 615         handler_obj->address_space.region_list = region_obj;
 616
 617         /* Install the region's handler */
 618
 619         if (region_obj->region.handler) {
 620                 return_ACPI_STATUS(AE_ALREADY_EXISTS);
 621         }
 622
 623         region_obj->region.handler = handler_obj;
 624         acpi_ut_add_reference(handler_obj);
 625
 626         return_ACPI_STATUS(AE_OK);
 627 }
 628
 629 /*******************************************************************************
 630  *
 631  * FUNCTION:    acpi_ev_install_handler
 632  *
 633  * PARAMETERS:  walk_namespace callback
 634  *
 635  * DESCRIPTION: This routine installs an address handler into objects that are
 636  *              of type Region or Device.
 637  *
 638  *              If the Object is a Device, and the device has a handler of
 639  *              the same type then the search is terminated in that branch.
 640  *
 641  *              This is because the existing handler is closer in proximity
 642  *              to any more regions than the one we are trying to install.
 643  *
 644  ******************************************************************************/
 645
 646 static acpi_status
 647 acpi_ev_install_handler(acpi_handle obj_handle,
 648                         u32 level, void *context, void **return_value)
 649 {
 650         union acpi_operand_object *handler_obj;
 651         union acpi_operand_object *next_handler_obj;
 652         union acpi_operand_object *obj_desc;
 653         struct acpi_namespace_node *node;
 654         acpi_status status;
 655
 656         ACPI_FUNCTION_NAME(ev_install_handler);
 657
 658         handler_obj = (union acpi_operand_object *)context;
 659
 660         /* Parameter validation */
 661
 662         if (!handler_obj) {
 663                 return (AE_OK);
 664         }
 665
 666         /* Convert and validate the device handle */
 667
 668         node = acpi_ns_map_handle_to_node(obj_handle);
 669         if (!node) {
 670                 return (AE_BAD_PARAMETER);
 671         }
 672
 673         /*
 674          * We only care about regions and objects that are allowed to have
 675          * address space handlers
 676          */
 677         if ((node->type != ACPI_TYPE_DEVICE) &&
 678             (node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
 679                 return (AE_OK);
 680         }
 681
 682         /* Check for an existing internal object */
 683
 684         obj_desc = acpi_ns_get_attached_object(node);
 685         if (!obj_desc) {
 686
 687                 /* No object, just exit */
 688
 689                 return (AE_OK);
 690         }
 691
 692         /* Devices are handled different than regions */
 693
 694         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_DEVICE) {
 695
 696                 /* Check if this Device already has a handler for this address space */
 697
 698                 next_handler_obj = obj_desc->device.handler;
 699                 while (next_handler_obj) {
 700
 701                         /* Found a handler, is it for the same address space? */
 702
 703                         if (next_handler_obj->address_space.space_id ==
 704                             handler_obj->address_space.space_id) {
 705                                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 706                                                   "Found handler for region [%s] in device %p(%p) handler %p\n",
 707                                                   acpi_ut_get_region_name
 708                                                   (handler_obj->address_space.
 709                                                    space_id), obj_desc,
 710                                                   next_handler_obj,
 711                                                   handler_obj));
 712
 713                                 /*
 714                                  * Since the object we found it on was a device, then it
 715                                  * means that someone has already installed a handler for
 716                                  * the branch of the namespace from this device on. Just
 717                                  * bail out telling the walk routine to not traverse this
 718                                  * branch. This preserves the scoping rule for handlers.
 719                                  */
 720                                 return (AE_CTRL_DEPTH);
 721                         }
 722
 723                         /* Walk the linked list of handlers attached to this device */
 724
 725                         next_handler_obj = next_handler_obj->address_space.next;
 726                 }
 727
 728                 /*
 729                  * As long as the device didn't have a handler for this space we
 730                  * don't care about it. We just ignore it and proceed.
 731                  */
 732                 return (AE_OK);
 733         }
 734
 735         /* Object is a Region */
 736
 737         if (obj_desc->region.space_id != handler_obj->address_space.space_id) {
 738
 739                 /* This region is for a different address space, just ignore it */
 740
 741                 return (AE_OK);
 742         }
 743
 744         /*
 745          * Now we have a region and it is for the handler's address space type.
 746          *
 747          * First disconnect region for any previous handler (if any)
 748          */
 749         acpi_ev_detach_region(obj_desc, FALSE);
 750
 751         /* Connect the region to the new handler */
 752
 753         status = acpi_ev_attach_region(handler_obj, obj_desc, FALSE);
 754         return (status);
 755 }
 756
 757 /*******************************************************************************
 758  *
 759  * FUNCTION:    acpi_ev_install_space_handler
 760  *
 761  * PARAMETERS:  Node            - Namespace node for the device
 762  *              space_id        - The address space ID
 763  *              Handler         - Address of the handler
 764  *              Setup           - Address of the setup function
 765  *              Context         - Value passed to the handler on each access
 766  *
 767  * RETURN:      Status
 768  *
 769  * DESCRIPTION: Install a handler for all op_regions of a given space_id.
 770  *              Assumes namespace is locked
 771  *
 772  ******************************************************************************/
 773
 774 acpi_status
 775 acpi_ev_install_space_handler(struct acpi_namespace_node * node,
 776                               acpi_adr_space_type space_id,
 777                               acpi_adr_space_handler handler,
 778                               acpi_adr_space_setup setup, void *context)
 779 {
 780         union acpi_operand_object *obj_desc;
 781         union acpi_operand_object *handler_obj;
 782         acpi_status status;
 783         acpi_object_type type;
 784         u8 flags = 0;
 785
 786         ACPI_FUNCTION_TRACE(ev_install_space_handler);
 787
 788         /*
 789          * This registration is valid for only the types below and the root. This
 790          * is where the default handlers get placed.
 791          */
 792         if ((node->type != ACPI_TYPE_DEVICE) &&
 793             (node->type != ACPI_TYPE_PROCESSOR) &&
 794             (node->type != ACPI_TYPE_THERMAL) && (node != acpi_gbl_root_node)) {
 795                 status = AE_BAD_PARAMETER;
 796                 goto unlock_and_exit;
 797         }
 798
 799         if (handler == ACPI_DEFAULT_HANDLER) {
 800                 flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;
 801
 802                 switch (space_id) {
 803                 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 804                         handler = acpi_ex_system_memory_space_handler;
 805                         setup = acpi_ev_system_memory_region_setup;
 806                         break;
 807
 808                 case ACPI_ADR_SPACE_SYSTEM_IO:
 809                         handler = acpi_ex_system_io_space_handler;
 810                         setup = acpi_ev_io_space_region_setup;
 811                         break;
 812
 813                 case ACPI_ADR_SPACE_PCI_CONFIG:
 814                         handler = acpi_ex_pci_config_space_handler;
 815                         setup = acpi_ev_pci_config_region_setup;
 816                         break;
 817
 818                 case ACPI_ADR_SPACE_CMOS:
 819                         handler = acpi_ex_cmos_space_handler;
 820                         setup = acpi_ev_cmos_region_setup;
 821                         break;
 822
 823                 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
 824                         handler = acpi_ex_pci_bar_space_handler;
 825                         setup = acpi_ev_pci_bar_region_setup;
 826                         break;
 827
 828                 case ACPI_ADR_SPACE_DATA_TABLE:
 829                         handler = acpi_ex_data_table_space_handler;
 830                         setup = NULL;
 831                         break;
 832
 833                 default:
 834                         status = AE_BAD_PARAMETER;
 835                         goto unlock_and_exit;
 836                 }
 837         }
 838
 839         /* If the caller hasn't specified a setup routine, use the default */
 840
 841         if (!setup) {
 842                 setup = acpi_ev_default_region_setup;
 843         }
 844
 845         /* Check for an existing internal object */
 846
 847         obj_desc = acpi_ns_get_attached_object(node);
 848         if (obj_desc) {
 849                 /*
 850                  * The attached device object already exists. Make sure the handler
 851                  * is not already installed.
 852                  */
 853                 handler_obj = obj_desc->device.handler;
 854
 855                 /* Walk the handler list for this device */
 856
 857                 while (handler_obj) {
 858
 859                         /* Same space_id indicates a handler already installed */
 860
 861                         if (handler_obj->address_space.space_id == space_id) {
 862                                 if (handler_obj->address_space.handler ==
 863                                     handler) {
 864                                         /*
 865                                          * It is (relatively) OK to attempt to install the SAME
 866                                          * handler twice. This can easily happen with the
 867                                          * PCI_Config space.
 868                                          */
 869                                         status = AE_SAME_HANDLER;
 870                                         goto unlock_and_exit;
 871                                 } else {
 872                                         /* A handler is already installed */
 873
 874                                         status = AE_ALREADY_EXISTS;
 875                                 }
 876                                 goto unlock_and_exit;
 877                         }
 878
 879                         /* Walk the linked list of handlers */
 880
 881                         handler_obj = handler_obj->address_space.next;
 882                 }
 883         } else {
 884                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 885                                   "Creating object on Device %p while installing handler\n",
 886                                   node));
 887
 888                 /* obj_desc does not exist, create one */
 889
 890                 if (node->type == ACPI_TYPE_ANY) {
 891                         type = ACPI_TYPE_DEVICE;
 892                 } else {
 893                         type = node->type;
 894                 }
 895
 896                 obj_desc = acpi_ut_create_internal_object(type);
 897                 if (!obj_desc) {
 898                         status = AE_NO_MEMORY;
 899                         goto unlock_and_exit;
 900                 }
 901
 902                 /* Init new descriptor */
 903
 904                 obj_desc->common.type = (u8) type;
 905
 906                 /* Attach the new object to the Node */
 907
 908                 status = acpi_ns_attach_object(node, obj_desc, type);
 909
 910                 /* Remove local reference to the object */
 911
 912                 acpi_ut_remove_reference(obj_desc);
 913
 914                 if (ACPI_FAILURE(status)) {
 915                         goto unlock_and_exit;
 916                 }
 917         }
 918
 919         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 920                           "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
 921                           acpi_ut_get_region_name(space_id), space_id,
 922                           acpi_ut_get_node_name(node), node, obj_desc));
 923
 924         /*
 925          * Install the handler
 926          *
 927          * At this point there is no existing handler. Just allocate the object
 928          * for the handler and link it into the list.
 929          */
 930         handler_obj =
 931             acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
 932         if (!handler_obj) {
 933                 status = AE_NO_MEMORY;
 934                 goto unlock_and_exit;
 935         }
 936
 937         /* Init handler obj */
 938
 939         handler_obj->address_space.space_id = (u8) space_id;
 940         handler_obj->address_space.handler_flags = flags;
 941         handler_obj->address_space.region_list = NULL;
 942         handler_obj->address_space.node = node;
 943         handler_obj->address_space.handler = handler;
 944         handler_obj->address_space.context = context;
 945         handler_obj->address_space.setup = setup;
 946
 947         /* Install at head of Device.address_space list */
 948
 949         handler_obj->address_space.next = obj_desc->device.handler;
 950
 951         /*
 952          * The Device object is the first reference on the handler_obj.
 953          * Each region that uses the handler adds a reference.
 954          */
 955         obj_desc->device.handler = handler_obj;
 956
 957         /*
 958          * Walk the namespace finding all of the regions this
 959          * handler will manage.
 960          *
 961          * Start at the device and search the branch toward
 962          * the leaf nodes until either the leaf is encountered or
 963          * a device is detected that has an address handler of the
 964          * same type.
 965          *
 966          * In either case, back up and search down the remainder
 967          * of the branch
 968          */
 969         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
 970                                         ACPI_NS_WALK_UNLOCK,
 971                                         acpi_ev_install_handler, handler_obj,
 972                                         NULL);
 973
 974       unlock_and_exit:
 975         return_ACPI_STATUS(status);
 976 }
 977
 978 /*******************************************************************************
 979  *
 980  * FUNCTION:    acpi_ev_execute_reg_methods
 981  *
 982  * PARAMETERS:  Node            - Namespace node for the device
 983  *              space_id        - The address space ID
 984  *
 985  * RETURN:      Status
 986  *
 987  * DESCRIPTION: Run all _REG methods for the input Space ID;
 988  *              Note: assumes namespace is locked, or system init time.
 989  *
 990  ******************************************************************************/
 991
 992 acpi_status
 993 acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
 994                             acpi_adr_space_type space_id)
 995 {
 996         acpi_status status;
 997
 998         ACPI_FUNCTION_TRACE(ev_execute_reg_methods);
 999
1000         /*
1001          * Run all _REG methods for all Operation Regions for this space ID. This
1002          * is a separate walk in order to handle any interdependencies between
1003          * regions and _REG methods. (i.e. handlers must be installed for all
1004          * regions of this Space ID before we can run any _REG methods)
1005          */
1006         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
1007                                         ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
1008                                         &space_id, NULL);
1009
1010         return_ACPI_STATUS(status);
1011 }
1012
1013 /*******************************************************************************
1014  *
1015  * FUNCTION:    acpi_ev_reg_run
1016  *
1017  * PARAMETERS:  walk_namespace callback
1018  *
1019  * DESCRIPTION: Run _REG method for region objects of the requested space_iD
1020  *
1021  ******************************************************************************/
1022
1023 static acpi_status
1024 acpi_ev_reg_run(acpi_handle obj_handle,
1025                 u32 level, void *context, void **return_value)
1026 {
1027         union acpi_operand_object *obj_desc;
1028         struct acpi_namespace_node *node;
1029         acpi_adr_space_type space_id;
1030         acpi_status status;
1031
1032         space_id = *ACPI_CAST_PTR(acpi_adr_space_type, context);
1033
1034         /* Convert and validate the device handle */
1035
1036         node = acpi_ns_map_handle_to_node(obj_handle);
1037         if (!node) {
1038                 return (AE_BAD_PARAMETER);
1039         }
1040
1041         /*
1042          * We only care about regions.and objects that are allowed to have address
1043          * space handlers
1044          */
1045         if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
1046                 return (AE_OK);
1047         }
1048
1049         /* Check for an existing internal object */
1050
1051         obj_desc = acpi_ns_get_attached_object(node);
1052         if (!obj_desc) {
1053
1054                 /* No object, just exit */
1055
1056                 return (AE_OK);
1057         }
1058
1059         /* Object is a Region */
1060
1061         if (obj_desc->region.space_id != space_id) {
1062
1063                 /* This region is for a different address space, just ignore it */
1064
1065                 return (AE_OK);
1066         }
1067
1068         status = acpi_ev_execute_reg_method(obj_desc, 1);
1069         return (status);
1070 }