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 - 2007, R. Byron Moore
   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/acevents.h>
  46 #include <acpi/acnamesp.h>
  47 #include <acpi/acinterp.h>
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evregion")
  51 #define ACPI_NUM_DEFAULT_SPACES     4
  52 static u8 acpi_gbl_default_address_spaces[ACPI_NUM_DEFAULT_SPACES] = {
  53         ACPI_ADR_SPACE_SYSTEM_MEMORY,
  54         ACPI_ADR_SPACE_SYSTEM_IO,
  55         ACPI_ADR_SPACE_PCI_CONFIG,
  56         ACPI_ADR_SPACE_DATA_TABLE
  57 };
  58
  59 /* Local prototypes */
  60
  61 static acpi_status
  62 acpi_ev_reg_run(acpi_handle obj_handle,
  63                 u32 level, void *context, void **return_value);
  64
  65 static acpi_status
  66 acpi_ev_install_handler(acpi_handle obj_handle,
  67                         u32 level, void *context, void **return_value);
  68
  69 /*******************************************************************************
  70  *
  71  * FUNCTION:    acpi_ev_install_region_handlers
  72  *
  73  * PARAMETERS:  None
  74  *
  75  * RETURN:      Status
  76  *
  77  * DESCRIPTION: Installs the core subsystem default address space handlers.
  78  *
  79  ******************************************************************************/
  80
  81 acpi_status acpi_ev_install_region_handlers(void)
  82 {
  83         acpi_status status;
  84         acpi_native_uint i;
  85
  86         ACPI_FUNCTION_TRACE(ev_install_region_handlers);
  87
  88         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  89         if (ACPI_FAILURE(status)) {
  90                 return_ACPI_STATUS(status);
  91         }
  92
  93         /*
  94          * All address spaces (PCI Config, EC, SMBus) are scope dependent
  95          * and registration must occur for a specific device.
  96          *
  97          * In the case of the system memory and IO address spaces there is currently
  98          * no device associated with the address space.  For these we use the root.
  99          *
 100          * We install the default PCI config space handler at the root so
 101          * that this space is immediately available even though the we have
 102          * not enumerated all the PCI Root Buses yet.  This is to conform
 103          * to the ACPI specification which states that the PCI config
 104          * space must be always available -- even though we are nowhere
 105          * near ready to find the PCI root buses at this point.
 106          *
 107          * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler
 108          * has already been installed (via acpi_install_address_space_handler).
 109          * Similar for AE_SAME_HANDLER.
 110          */
 111         for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
 112                 status = acpi_ev_install_space_handler(acpi_gbl_root_node,
 113                                                        acpi_gbl_default_address_spaces
 114                                                        [i],
 115                                                        ACPI_DEFAULT_HANDLER,
 116                                                        NULL, NULL);
 117                 switch (status) {
 118                 case AE_OK:
 119                 case AE_SAME_HANDLER:
 120                 case AE_ALREADY_EXISTS:
 121
 122                         /* These exceptions are all OK */
 123
 124                         status = AE_OK;
 125                         break;
 126
 127                 default:
 128
 129                         goto unlock_and_exit;
 130                 }
 131         }
 132
 133       unlock_and_exit:
 134         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 135         return_ACPI_STATUS(status);
 136 }
 137
 138 /*******************************************************************************
 139  *
 140  * FUNCTION:    acpi_ev_initialize_op_regions
 141  *
 142  * PARAMETERS:  None
 143  *
 144  * RETURN:      Status
 145  *
 146  * DESCRIPTION: Execute _REG methods for all Operation Regions that have
 147  *              an installed default region handler.
 148  *
 149  ******************************************************************************/
 150
 151 acpi_status acpi_ev_initialize_op_regions(void)
 152 {
 153         acpi_status status;
 154         acpi_native_uint i;
 155
 156         ACPI_FUNCTION_TRACE(ev_initialize_op_regions);
 157
 158         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 159         if (ACPI_FAILURE(status)) {
 160                 return_ACPI_STATUS(status);
 161         }
 162
 163         /*
 164          * Run the _REG methods for op_regions in each default address space
 165          */
 166         for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
 167
 168                 /* TBD: Make sure handler is the DEFAULT handler, otherwise
 169                  * _REG will have already been run.
 170                  */
 171                 status = acpi_ev_execute_reg_methods(acpi_gbl_root_node,
 172                                                      acpi_gbl_default_address_spaces
 173                                                      [i]);
 174         }
 175
 176         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 177         return_ACPI_STATUS(status);
 178 }
 179
 180 /*******************************************************************************
 181  *
 182  * FUNCTION:    acpi_ev_execute_reg_method
 183  *
 184  * PARAMETERS:  region_obj          - Region object
 185  *              Function            - Passed to _REG: On (1) or Off (0)
 186  *
 187  * RETURN:      Status
 188  *
 189  * DESCRIPTION: Execute _REG method for a region
 190  *
 191  ******************************************************************************/
 192
 193 acpi_status
 194 acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
 195 {
 196         struct acpi_evaluate_info *info;
 197         union acpi_operand_object *args[3];
 198         union acpi_operand_object *region_obj2;
 199         acpi_status status;
 200
 201         ACPI_FUNCTION_TRACE(ev_execute_reg_method);
 202
 203         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 204         if (!region_obj2) {
 205                 return_ACPI_STATUS(AE_NOT_EXIST);
 206         }
 207
 208         if (region_obj2->extra.method_REG == NULL) {
 209                 return_ACPI_STATUS(AE_OK);
 210         }
 211
 212         /* Allocate and initialize the evaluation information block */
 213
 214         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 215         if (!info) {
 216                 return_ACPI_STATUS(AE_NO_MEMORY);
 217         }
 218
 219         info->prefix_node = region_obj2->extra.method_REG;
 220         info->pathname = NULL;
 221         info->parameters = args;
 222         info->parameter_type = ACPI_PARAM_ARGS;
 223         info->flags = ACPI_IGNORE_RETURN_VALUE;
 224
 225         /*
 226          * The _REG method has two arguments:
 227          *
 228          * Arg0 - Integer:
 229          *  Operation region space ID Same value as region_obj->Region.space_id
 230          *
 231          * Arg1 - Integer:
 232          *  connection status 1 for connecting the handler, 0 for disconnecting
 233          *  the handler (Passed as a parameter)
 234          */
 235         args[0] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 236         if (!args[0]) {
 237                 status = AE_NO_MEMORY;
 238                 goto cleanup1;
 239         }
 240
 241         args[1] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 242         if (!args[1]) {
 243                 status = AE_NO_MEMORY;
 244                 goto cleanup2;
 245         }
 246
 247         /* Setup the parameter objects */
 248
 249         args[0]->integer.value = region_obj->region.space_id;
 250         args[1]->integer.value = function;
 251         args[2] = NULL;
 252
 253         /* Execute the method, no return value */
 254
 255         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 256                         (ACPI_TYPE_METHOD, info->prefix_node, NULL));
 257
 258         status = acpi_ns_evaluate(info);
 259         acpi_ut_remove_reference(args[1]);
 260
 261       cleanup2:
 262         acpi_ut_remove_reference(args[0]);
 263
 264       cleanup1:
 265         ACPI_FREE(info);
 266         return_ACPI_STATUS(status);
 267 }
 268
 269 /*******************************************************************************
 270  *
 271  * FUNCTION:    acpi_ev_address_space_dispatch
 272  *
 273  * PARAMETERS:  region_obj          - Internal region object
 274  *              Function            - Read or Write operation
 275  *              Address             - Where in the space to read or write
 276  *              bit_width           - Field width in bits (8, 16, 32, or 64)
 277  *              Value               - Pointer to in or out value, must be
 278  *                                    full 64-bit acpi_integer
 279  *
 280  * RETURN:      Status
 281  *
 282  * DESCRIPTION: Dispatch an address space or operation region access to
 283  *              a previously installed handler.
 284  *
 285  ******************************************************************************/
 286
 287 acpi_status
 288 acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
 289                                u32 function,
 290                                acpi_physical_address address,
 291                                u32 bit_width, acpi_integer * value)
 292 {
 293         acpi_status status;
 294         acpi_adr_space_handler handler;
 295         acpi_adr_space_setup region_setup;
 296         union acpi_operand_object *handler_desc;
 297         union acpi_operand_object *region_obj2;
 298         void *region_context = NULL;
 299
 300         ACPI_FUNCTION_TRACE(ev_address_space_dispatch);
 301
 302         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 303         if (!region_obj2) {
 304                 return_ACPI_STATUS(AE_NOT_EXIST);
 305         }
 306
 307         /* Ensure that there is a handler associated with this region */
 308
 309         handler_desc = region_obj->region.handler;
 310         if (!handler_desc) {
 311                 ACPI_ERROR((AE_INFO,
 312                             "No handler for Region [%4.4s] (%p) [%s]",
 313                             acpi_ut_get_node_name(region_obj->region.node),
 314                             region_obj,
 315                             acpi_ut_get_region_name(region_obj->region.
 316                                                     space_id)));
 317
 318                 return_ACPI_STATUS(AE_NOT_EXIST);
 319         }
 320
 321         /*
 322          * It may be the case that the region has never been initialized
 323          * Some types of regions require special init code
 324          */
 325         if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
 326                 /*
 327                  * This region has not been initialized yet, do it
 328                  */
 329                 region_setup = handler_desc->address_space.setup;
 330                 if (!region_setup) {
 331
 332                         /* No initialization routine, exit with error */
 333
 334                         ACPI_ERROR((AE_INFO,
 335                                     "No init routine for region(%p) [%s]",
 336                                     region_obj,
 337                                     acpi_ut_get_region_name(region_obj->region.
 338                                                             space_id)));
 339                         return_ACPI_STATUS(AE_NOT_EXIST);
 340                 }
 341
 342                 /*
 343                  * We must exit the interpreter because the region
 344                  * setup will potentially execute control methods
 345                  * (e.g., _REG method for this region)
 346                  */
 347                 acpi_ex_exit_interpreter();
 348
 349                 status = region_setup(region_obj, ACPI_REGION_ACTIVATE,
 350                                       handler_desc->address_space.context,
 351                                       &region_context);
 352
 353                 /* Re-enter the interpreter */
 354
 355                 acpi_ex_enter_interpreter();
 356
 357                 /* Check for failure of the Region Setup */
 358
 359                 if (ACPI_FAILURE(status)) {
 360                         ACPI_EXCEPTION((AE_INFO, status,
 361                                         "During region initialization: [%s]",
 362                                         acpi_ut_get_region_name(region_obj->
 363                                                                 region.
 364                                                                 space_id)));
 365                         return_ACPI_STATUS(status);
 366                 }
 367
 368                 /*
 369                  * Region initialization may have been completed by region_setup
 370                  */
 371                 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
 372                         region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
 373
 374                         if (region_obj2->extra.region_context) {
 375
 376                                 /* The handler for this region was already installed */
 377
 378                                 ACPI_FREE(region_context);
 379                         } else {
 380                                 /*
 381                                  * Save the returned context for use in all accesses to
 382                                  * this particular region
 383                                  */
 384                                 region_obj2->extra.region_context =
 385                                     region_context;
 386                         }
 387                 }
 388         }
 389
 390         /* We have everything we need, we can invoke the address space handler */
 391
 392         handler = handler_desc->address_space.handler;
 393
 394         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 395                           "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
 396                           &region_obj->region.handler->address_space, handler,
 397                           ACPI_FORMAT_UINT64(address),
 398                           acpi_ut_get_region_name(region_obj->region.
 399                                                   space_id)));
 400
 401         if (!(handler_desc->address_space.handler_flags &
 402               ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
 403                 /*
 404                  * For handlers other than the default (supplied) handlers, we must
 405                  * exit the interpreter because the handler *might* block -- we don't
 406                  * know what it will do, so we can't hold the lock on the intepreter.
 407                  */
 408                 acpi_ex_exit_interpreter();
 409         }
 410
 411         /* Call the handler */
 412
 413         status = handler(function, address, bit_width, value,
 414                          handler_desc->address_space.context,
 415                          region_obj2->extra.region_context);
 416
 417         if (ACPI_FAILURE(status)) {
 418                 ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]",
 419                                 acpi_ut_get_region_name(region_obj->region.
 420                                                         space_id)));
 421         }
 422
 423         if (!(handler_desc->address_space.handler_flags &
 424               ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
 425                 /*
 426                  * We just returned from a non-default handler, we must re-enter the
 427                  * interpreter
 428                  */
 429                 acpi_ex_enter_interpreter();
 430         }
 431
 432         return_ACPI_STATUS(status);
 433 }
 434
 435 /*******************************************************************************
 436  *
 437  * FUNCTION:    acpi_ev_detach_region
 438  *
 439  * PARAMETERS:  region_obj          - Region Object
 440  *              acpi_ns_is_locked   - Namespace Region Already Locked?
 441  *
 442  * RETURN:      None
 443  *
 444  * DESCRIPTION: Break the association between the handler and the region
 445  *              this is a two way association.
 446  *
 447  ******************************************************************************/
 448
 449 void
 450 acpi_ev_detach_region(union acpi_operand_object *region_obj,
 451                       u8 acpi_ns_is_locked)
 452 {
 453         union acpi_operand_object *handler_obj;
 454         union acpi_operand_object *obj_desc;
 455         union acpi_operand_object **last_obj_ptr;
 456         acpi_adr_space_setup region_setup;
 457         void **region_context;
 458         union acpi_operand_object *region_obj2;
 459         acpi_status status;
 460
 461         ACPI_FUNCTION_TRACE(ev_detach_region);
 462
 463         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 464         if (!region_obj2) {
 465                 return_VOID;
 466         }
 467         region_context = &region_obj2->extra.region_context;
 468
 469         /* Get the address handler from the region object */
 470
 471         handler_obj = region_obj->region.handler;
 472         if (!handler_obj) {
 473
 474                 /* This region has no handler, all done */
 475
 476                 return_VOID;
 477         }
 478
 479         /* Find this region in the handler's list */
 480
 481         obj_desc = handler_obj->address_space.region_list;
 482         last_obj_ptr = &handler_obj->address_space.region_list;
 483
 484         while (obj_desc) {
 485
 486                 /* Is this the correct Region? */
 487
 488                 if (obj_desc == region_obj) {
 489                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 490                                           "Removing Region %p from address handler %p\n",
 491                                           region_obj, handler_obj));
 492
 493                         /* This is it, remove it from the handler's list */
 494
 495                         *last_obj_ptr = obj_desc->region.next;
 496                         obj_desc->region.next = NULL;   /* Must clear field */
 497
 498                         if (acpi_ns_is_locked) {
 499                                 status =
 500                                     acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 501                                 if (ACPI_FAILURE(status)) {
 502                                         return_VOID;
 503                                 }
 504                         }
 505
 506                         /* Now stop region accesses by executing the _REG method */
 507
 508                         status = acpi_ev_execute_reg_method(region_obj, 0);
 509                         if (ACPI_FAILURE(status)) {
 510                                 ACPI_EXCEPTION((AE_INFO, status,
 511                                                 "from region _REG, [%s]",
 512                                                 acpi_ut_get_region_name
 513                                                 (region_obj->region.space_id)));
 514                         }
 515
 516                         if (acpi_ns_is_locked) {
 517                                 status =
 518                                     acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 519                                 if (ACPI_FAILURE(status)) {
 520                                         return_VOID;
 521                                 }
 522                         }
 523
 524                         /*
 525                          * If the region has been activated, call the setup handler
 526                          * with the deactivate notification
 527                          */
 528                         if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
 529                                 region_setup = handler_obj->address_space.setup;
 530                                 status =
 531                                     region_setup(region_obj,
 532                                                  ACPI_REGION_DEACTIVATE,
 533                                                  handler_obj->address_space.
 534                                                  context, region_context);
 535
 536                                 /* Init routine may fail, Just ignore errors */
 537
 538                                 if (ACPI_FAILURE(status)) {
 539                                         ACPI_EXCEPTION((AE_INFO, status,
 540                                                         "from region handler - deactivate, [%s]",
 541                                                         acpi_ut_get_region_name
 542                                                         (region_obj->region.
 543                                                          space_id)));
 544                                 }
 545
 546                                 region_obj->region.flags &=
 547                                     ~(AOPOBJ_SETUP_COMPLETE);
 548                         }
 549
 550                         /*
 551                          * Remove handler reference in the region
 552                          *
 553                          * NOTE: this doesn't mean that the region goes away, the region
 554                          * is just inaccessible as indicated to the _REG method
 555                          *
 556                          * If the region is on the handler's list, this must be the
 557                          * region's handler
 558                          */
 559                         region_obj->region.handler = NULL;
 560                         acpi_ut_remove_reference(handler_obj);
 561
 562                         return_VOID;
 563                 }
 564
 565                 /* Walk the linked list of handlers */
 566
 567                 last_obj_ptr = &obj_desc->region.next;
 568                 obj_desc = obj_desc->region.next;
 569         }
 570
 571         /* If we get here, the region was not in the handler's region list */
 572
 573         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 574                           "Cannot remove region %p from address handler %p\n",
 575                           region_obj, handler_obj));
 576
 577         return_VOID;
 578 }
 579
 580 /*******************************************************************************
 581  *
 582  * FUNCTION:    acpi_ev_attach_region
 583  *
 584  * PARAMETERS:  handler_obj         - Handler Object
 585  *              region_obj          - Region Object
 586  *              acpi_ns_is_locked   - Namespace Region Already Locked?
 587  *
 588  * RETURN:      None
 589  *
 590  * DESCRIPTION: Create the association between the handler and the region
 591  *              this is a two way association.
 592  *
 593  ******************************************************************************/
 594
 595 acpi_status
 596 acpi_ev_attach_region(union acpi_operand_object *handler_obj,
 597                       union acpi_operand_object *region_obj,
 598                       u8 acpi_ns_is_locked)
 599 {
 600
 601         ACPI_FUNCTION_TRACE(ev_attach_region);
 602
 603         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 604                           "Adding Region [%4.4s] %p to address handler %p [%s]\n",
 605                           acpi_ut_get_node_name(region_obj->region.node),
 606                           region_obj, handler_obj,
 607                           acpi_ut_get_region_name(region_obj->region.
 608                                                   space_id)));
 609
 610         /* Link this region to the front of the handler's list */
 611
 612         region_obj->region.next = handler_obj->address_space.region_list;
 613         handler_obj->address_space.region_list = region_obj;
 614
 615         /* Install the region's handler */
 616
 617         if (region_obj->region.handler) {
 618                 return_ACPI_STATUS(AE_ALREADY_EXISTS);
 619         }
 620
 621         region_obj->region.handler = handler_obj;
 622         acpi_ut_add_reference(handler_obj);
 623
 624         return_ACPI_STATUS(AE_OK);
 625 }
 626
 627 /*******************************************************************************
 628  *
 629  * FUNCTION:    acpi_ev_install_handler
 630  *
 631  * PARAMETERS:  walk_namespace callback
 632  *
 633  * DESCRIPTION: This routine installs an address handler into objects that are
 634  *              of type Region or Device.
 635  *
 636  *              If the Object is a Device, and the device has a handler of
 637  *              the same type then the search is terminated in that branch.
 638  *
 639  *              This is because the existing handler is closer in proximity
 640  *              to any more regions than the one we are trying to install.
 641  *
 642  ******************************************************************************/
 643
 644 static acpi_status
 645 acpi_ev_install_handler(acpi_handle obj_handle,
 646                         u32 level, void *context, void **return_value)
 647 {
 648         union acpi_operand_object *handler_obj;
 649         union acpi_operand_object *next_handler_obj;
 650         union acpi_operand_object *obj_desc;
 651         struct acpi_namespace_node *node;
 652         acpi_status status;
 653
 654         ACPI_FUNCTION_NAME(ev_install_handler);
 655
 656         handler_obj = (union acpi_operand_object *)context;
 657
 658         /* Parameter validation */
 659
 660         if (!handler_obj) {
 661                 return (AE_OK);
 662         }
 663
 664         /* Convert and validate the device handle */
 665
 666         node = acpi_ns_map_handle_to_node(obj_handle);
 667         if (!node) {
 668                 return (AE_BAD_PARAMETER);
 669         }
 670
 671         /*
 672          * We only care about regions.and objects
 673          * that are allowed to have address space handlers
 674          */
 675         if ((node->type != ACPI_TYPE_DEVICE) &&
 676             (node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
 677                 return (AE_OK);
 678         }
 679
 680         /* Check for an existing internal object */
 681
 682         obj_desc = acpi_ns_get_attached_object(node);
 683         if (!obj_desc) {
 684
 685                 /* No object, just exit */
 686
 687                 return (AE_OK);
 688         }
 689
 690         /* Devices are handled different than regions */
 691
 692         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_DEVICE) {
 693
 694                 /* Check if this Device already has a handler for this address space */
 695
 696                 next_handler_obj = obj_desc->device.handler;
 697                 while (next_handler_obj) {
 698
 699                         /* Found a handler, is it for the same address space? */
 700
 701                         if (next_handler_obj->address_space.space_id ==
 702                             handler_obj->address_space.space_id) {
 703                                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 704                                                   "Found handler for region [%s] in device %p(%p) handler %p\n",
 705                                                   acpi_ut_get_region_name
 706                                                   (handler_obj->address_space.
 707                                                    space_id), obj_desc,
 708                                                   next_handler_obj,
 709                                                   handler_obj));
 710
 711                                 /*
 712                                  * Since the object we found it on was a device, then it
 713                                  * means that someone has already installed a handler for
 714                                  * the branch of the namespace from this device on.  Just
 715                                  * bail out telling the walk routine to not traverse this
 716                                  * branch.  This preserves the scoping rule for handlers.
 717                                  */
 718                                 return (AE_CTRL_DEPTH);
 719                         }
 720
 721                         /* Walk the linked list of handlers attached to this device */
 722
 723                         next_handler_obj = next_handler_obj->address_space.next;
 724                 }
 725
 726                 /*
 727                  * As long as the device didn't have a handler for this
 728                  * space we don't care about it.  We just ignore it and
 729                  * proceed.
 730                  */
 731                 return (AE_OK);
 732         }
 733
 734         /* Object is a Region */
 735
 736         if (obj_desc->region.space_id != handler_obj->address_space.space_id) {
 737                 /*
 738                  * This region is for a different address space
 739                  * -- 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
 746          * space type.
 747          *
 748          * First disconnect region for any previous handler (if any)
 749          */
 750         acpi_ev_detach_region(obj_desc, FALSE);
 751
 752         /* Connect the region to the new handler */
 753
 754         status = acpi_ev_attach_region(handler_obj, obj_desc, FALSE);
 755         return (status);
 756 }
 757
 758 /*******************************************************************************
 759  *
 760  * FUNCTION:    acpi_ev_install_space_handler
 761  *
 762  * PARAMETERS:  Node            - Namespace node for the device
 763  *              space_id        - The address space ID
 764  *              Handler         - Address of the handler
 765  *              Setup           - Address of the setup function
 766  *              Context         - Value passed to the handler on each access
 767  *
 768  * RETURN:      Status
 769  *
 770  * DESCRIPTION: Install a handler for all op_regions of a given space_id.
 771  *              Assumes namespace is locked
 772  *
 773  ******************************************************************************/
 774
 775 acpi_status
 776 acpi_ev_install_space_handler(struct acpi_namespace_node * node,
 777                               acpi_adr_space_type space_id,
 778                               acpi_adr_space_handler handler,
 779                               acpi_adr_space_setup setup, void *context)
 780 {
 781         union acpi_operand_object *obj_desc;
 782         union acpi_operand_object *handler_obj;
 783         acpi_status status;
 784         acpi_object_type type;
 785         u8 flags = 0;
 786
 787         ACPI_FUNCTION_TRACE(ev_install_space_handler);
 788
 789         /*
 790          * This registration is valid for only the types below
 791          * and the root.  This is where the default handlers
 792          * get placed.
 793          */
 794         if ((node->type != ACPI_TYPE_DEVICE) &&
 795             (node->type != ACPI_TYPE_PROCESSOR) &&
 796             (node->type != ACPI_TYPE_THERMAL) && (node != acpi_gbl_root_node)) {
 797                 status = AE_BAD_PARAMETER;
 798                 goto unlock_and_exit;
 799         }
 800
 801         if (handler == ACPI_DEFAULT_HANDLER) {
 802                 flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;
 803
 804                 switch (space_id) {
 805                 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 806                         handler = acpi_ex_system_memory_space_handler;
 807                         setup = acpi_ev_system_memory_region_setup;
 808                         break;
 809
 810                 case ACPI_ADR_SPACE_SYSTEM_IO:
 811                         handler = acpi_ex_system_io_space_handler;
 812                         setup = acpi_ev_io_space_region_setup;
 813                         break;
 814
 815                 case ACPI_ADR_SPACE_PCI_CONFIG:
 816                         handler = acpi_ex_pci_config_space_handler;
 817                         setup = acpi_ev_pci_config_region_setup;
 818                         break;
 819
 820                 case ACPI_ADR_SPACE_CMOS:
 821                         handler = acpi_ex_cmos_space_handler;
 822                         setup = acpi_ev_cmos_region_setup;
 823                         break;
 824
 825                 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
 826                         handler = acpi_ex_pci_bar_space_handler;
 827                         setup = acpi_ev_pci_bar_region_setup;
 828                         break;
 829
 830                 case ACPI_ADR_SPACE_DATA_TABLE:
 831                         handler = acpi_ex_data_table_space_handler;
 832                         setup = NULL;
 833                         break;
 834
 835                 default:
 836                         status = AE_BAD_PARAMETER;
 837                         goto unlock_and_exit;
 838                 }
 839         }
 840
 841         /* If the caller hasn't specified a setup routine, use the default */
 842
 843         if (!setup) {
 844                 setup = acpi_ev_default_region_setup;
 845         }
 846
 847         /* Check for an existing internal object */
 848
 849         obj_desc = acpi_ns_get_attached_object(node);
 850         if (obj_desc) {
 851                 /*
 852                  * The attached device object already exists.
 853                  * Make sure the handler is not already installed.
 854                  */
 855                 handler_obj = obj_desc->device.handler;
 856
 857                 /* Walk the handler list for this device */
 858
 859                 while (handler_obj) {
 860
 861                         /* Same space_id indicates a handler already installed */
 862
 863                         if (handler_obj->address_space.space_id == space_id) {
 864                                 if (handler_obj->address_space.handler ==
 865                                     handler) {
 866                                         /*
 867                                          * It is (relatively) OK to attempt to install the SAME
 868                                          * handler twice. This can easily happen
 869                                          * with PCI_Config space.
 870                                          */
 871                                         status = AE_SAME_HANDLER;
 872                                         goto unlock_and_exit;
 873                                 } else {
 874                                         /* A handler is already installed */
 875
 876                                         status = AE_ALREADY_EXISTS;
 877                                 }
 878                                 goto unlock_and_exit;
 879                         }
 880
 881                         /* Walk the linked list of handlers */
 882
 883                         handler_obj = handler_obj->address_space.next;
 884                 }
 885         } else {
 886                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 887                                   "Creating object on Device %p while installing handler\n",
 888                                   node));
 889
 890                 /* obj_desc does not exist, create one */
 891
 892                 if (node->type == ACPI_TYPE_ANY) {
 893                         type = ACPI_TYPE_DEVICE;
 894                 } else {
 895                         type = node->type;
 896                 }
 897
 898                 obj_desc = acpi_ut_create_internal_object(type);
 899                 if (!obj_desc) {
 900                         status = AE_NO_MEMORY;
 901                         goto unlock_and_exit;
 902                 }
 903
 904                 /* Init new descriptor */
 905
 906                 obj_desc->common.type = (u8) type;
 907
 908                 /* Attach the new object to the Node */
 909
 910                 status = acpi_ns_attach_object(node, obj_desc, type);
 911
 912                 /* Remove local reference to the object */
 913
 914                 acpi_ut_remove_reference(obj_desc);
 915
 916                 if (ACPI_FAILURE(status)) {
 917                         goto unlock_and_exit;
 918                 }
 919         }
 920
 921         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 922                           "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
 923                           acpi_ut_get_region_name(space_id), space_id,
 924                           acpi_ut_get_node_name(node), node, obj_desc));
 925
 926         /*
 927          * Install the handler
 928          *
 929          * At this point there is no existing handler.
 930          * Just allocate the object for the handler and link it
 931          * into the list.
 932          */
 933         handler_obj =
 934             acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
 935         if (!handler_obj) {
 936                 status = AE_NO_MEMORY;
 937                 goto unlock_and_exit;
 938         }
 939
 940         /* Init handler obj */
 941
 942         handler_obj->address_space.space_id = (u8) space_id;
 943         handler_obj->address_space.handler_flags = flags;
 944         handler_obj->address_space.region_list = NULL;
 945         handler_obj->address_space.node = node;
 946         handler_obj->address_space.handler = handler;
 947         handler_obj->address_space.context = context;
 948         handler_obj->address_space.setup = setup;
 949
 950         /* Install at head of Device.address_space list */
 951
 952         handler_obj->address_space.next = obj_desc->device.handler;
 953
 954         /*
 955          * The Device object is the first reference on the handler_obj.
 956          * Each region that uses the handler adds a reference.
 957          */
 958         obj_desc->device.handler = handler_obj;
 959
 960         /*
 961          * Walk the namespace finding all of the regions this
 962          * handler will manage.
 963          *
 964          * Start at the device and search the branch toward
 965          * the leaf nodes until either the leaf is encountered or
 966          * a device is detected that has an address handler of the
 967          * same type.
 968          *
 969          * In either case, back up and search down the remainder
 970          * of the branch
 971          */
 972         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
 973                                         ACPI_NS_WALK_UNLOCK,
 974                                         acpi_ev_install_handler, handler_obj,
 975                                         NULL);
 976
 977       unlock_and_exit:
 978         return_ACPI_STATUS(status);
 979 }
 980
 981 /*******************************************************************************
 982  *
 983  * FUNCTION:    acpi_ev_execute_reg_methods
 984  *
 985  * PARAMETERS:  Node            - Namespace node for the device
 986  *              space_id        - The address space ID
 987  *
 988  * RETURN:      Status
 989  *
 990  * DESCRIPTION: Run all _REG methods for the input Space ID;
 991  *              Note: assumes namespace is locked, or system init time.
 992  *
 993  ******************************************************************************/
 994
 995 acpi_status
 996 acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
 997                             acpi_adr_space_type space_id)
 998 {
 999         acpi_status status;
1000
1001         ACPI_FUNCTION_TRACE(ev_execute_reg_methods);
1002
1003         /*
1004          * Run all _REG methods for all Operation Regions for this
1005          * space ID.  This is a separate walk in order to handle any
1006          * interdependencies between regions and _REG methods.  (i.e. handlers
1007          * must be installed for all regions of this Space ID before we
1008          * can run any _REG methods)
1009          */
1010         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
1011                                         ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
1012                                         &space_id, NULL);
1013
1014         return_ACPI_STATUS(status);
1015 }
1016
1017 /*******************************************************************************
1018  *
1019  * FUNCTION:    acpi_ev_reg_run
1020  *
1021  * PARAMETERS:  walk_namespace callback
1022  *
1023  * DESCRIPTION: Run _REG method for region objects of the requested space_iD
1024  *
1025  ******************************************************************************/
1026
1027 static acpi_status
1028 acpi_ev_reg_run(acpi_handle obj_handle,
1029                 u32 level, void *context, void **return_value)
1030 {
1031         union acpi_operand_object *obj_desc;
1032         struct acpi_namespace_node *node;
1033         acpi_adr_space_type space_id;
1034         acpi_status status;
1035
1036         space_id = *ACPI_CAST_PTR(acpi_adr_space_type, context);
1037
1038         /* Convert and validate the device handle */
1039
1040         node = acpi_ns_map_handle_to_node(obj_handle);
1041         if (!node) {
1042                 return (AE_BAD_PARAMETER);
1043         }
1044
1045         /*
1046          * We only care about regions.and objects
1047          * that are allowed to have address space handlers
1048          */
1049         if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
1050                 return (AE_OK);
1051         }
1052
1053         /* Check for an existing internal object */
1054
1055         obj_desc = acpi_ns_get_attached_object(node);
1056         if (!obj_desc) {
1057
1058                 /* No object, just exit */
1059
1060                 return (AE_OK);
1061         }
1062
1063         /* Object is a Region */
1064
1065         if (obj_desc->region.space_id != space_id) {
1066                 /*
1067                  * This region is for a different address space
1068                  * -- just ignore it
1069                  */
1070                 return (AE_OK);
1071         }
1072
1073         status = acpi_ev_execute_reg_method(obj_desc, 1);
1074         return (status);
1075 }