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 - 2006, 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                 /* TBD: Make sure handler is the DEFAULT handler, otherwise
 168                  * _REG will have already been run.
 169                  */
 170                 status = acpi_ev_execute_reg_methods(acpi_gbl_root_node,
 171                                                      acpi_gbl_default_address_spaces
 172                                                      [i]);
 173         }
 174
 175         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 176         return_ACPI_STATUS(status);
 177 }
 178
 179 /*******************************************************************************
 180  *
 181  * FUNCTION:    acpi_ev_execute_reg_method
 182  *
 183  * PARAMETERS:  region_obj          - Region object
 184  *              Function            - Passed to _REG: On (1) or Off (0)
 185  *
 186  * RETURN:      Status
 187  *
 188  * DESCRIPTION: Execute _REG method for a region
 189  *
 190  ******************************************************************************/
 191
 192 acpi_status
 193 acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
 194 {
 195         struct acpi_parameter_info info;
 196         union acpi_operand_object *params[3];
 197         union acpi_operand_object *region_obj2;
 198         acpi_status status;
 199
 200         ACPI_FUNCTION_TRACE("ev_execute_reg_method");
 201
 202         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 203         if (!region_obj2) {
 204                 return_ACPI_STATUS(AE_NOT_EXIST);
 205         }
 206
 207         if (region_obj2->extra.method_REG == NULL) {
 208                 return_ACPI_STATUS(AE_OK);
 209         }
 210
 211         /*
 212          * The _REG method has two arguments:
 213          *
 214          * Arg0, Integer: Operation region space ID
 215          *          Same value as region_obj->Region.space_id
 216          * Arg1, Integer: connection status
 217          *          1 for connecting the handler,
 218          *          0 for disconnecting the handler
 219          *          Passed as a parameter
 220          */
 221         params[0] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 222         if (!params[0]) {
 223                 return_ACPI_STATUS(AE_NO_MEMORY);
 224         }
 225
 226         params[1] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 227         if (!params[1]) {
 228                 status = AE_NO_MEMORY;
 229                 goto cleanup;
 230         }
 231
 232         /* Setup the parameter objects */
 233
 234         params[0]->integer.value = region_obj->region.space_id;
 235         params[1]->integer.value = function;
 236         params[2] = NULL;
 237
 238         info.node = region_obj2->extra.method_REG;
 239         info.parameters = params;
 240         info.parameter_type = ACPI_PARAM_ARGS;
 241
 242         /* Execute the method, no return value */
 243
 244         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 245                         (ACPI_TYPE_METHOD, info.node, NULL));
 246         status = acpi_ns_evaluate_by_handle(&info);
 247
 248         acpi_ut_remove_reference(params[1]);
 249
 250       cleanup:
 251         acpi_ut_remove_reference(params[0]);
 252
 253         return_ACPI_STATUS(status);
 254 }
 255
 256 /*******************************************************************************
 257  *
 258  * FUNCTION:    acpi_ev_address_space_dispatch
 259  *
 260  * PARAMETERS:  region_obj          - Internal region object
 261  *              Function            - Read or Write operation
 262  *              Address             - Where in the space to read or write
 263  *              bit_width           - Field width in bits (8, 16, 32, or 64)
 264  *              Value               - Pointer to in or out value
 265  *
 266  * RETURN:      Status
 267  *
 268  * DESCRIPTION: Dispatch an address space or operation region access to
 269  *              a previously installed handler.
 270  *
 271  ******************************************************************************/
 272
 273 acpi_status
 274 acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
 275                                u32 function,
 276                                acpi_physical_address address,
 277                                u32 bit_width, void *value)
 278 {
 279         acpi_status status;
 280         acpi_status status2;
 281         acpi_adr_space_handler handler;
 282         acpi_adr_space_setup region_setup;
 283         union acpi_operand_object *handler_desc;
 284         union acpi_operand_object *region_obj2;
 285         void *region_context = NULL;
 286
 287         ACPI_FUNCTION_TRACE("ev_address_space_dispatch");
 288
 289         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 290         if (!region_obj2) {
 291                 return_ACPI_STATUS(AE_NOT_EXIST);
 292         }
 293
 294         /* Ensure that there is a handler associated with this region */
 295
 296         handler_desc = region_obj->region.handler;
 297         if (!handler_desc) {
 298                 ACPI_ERROR((AE_INFO,
 299                             "No handler for Region [%4.4s] (%p) [%s]",
 300                             acpi_ut_get_node_name(region_obj->region.node),
 301                             region_obj,
 302                             acpi_ut_get_region_name(region_obj->region.
 303                                                     space_id)));
 304
 305                 return_ACPI_STATUS(AE_NOT_EXIST);
 306         }
 307
 308         /*
 309          * It may be the case that the region has never been initialized
 310          * Some types of regions require special init code
 311          */
 312         if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
 313                 /*
 314                  * This region has not been initialized yet, do it
 315                  */
 316                 region_setup = handler_desc->address_space.setup;
 317                 if (!region_setup) {
 318                         /* No initialization routine, exit with error */
 319
 320                         ACPI_ERROR((AE_INFO,
 321                                     "No init routine for region(%p) [%s]",
 322                                     region_obj,
 323                                     acpi_ut_get_region_name(region_obj->region.
 324                                                             space_id)));
 325                         return_ACPI_STATUS(AE_NOT_EXIST);
 326                 }
 327
 328                 /*
 329                  * We must exit the interpreter because the region
 330                  * setup will potentially execute control methods
 331                  * (e.g., _REG method for this region)
 332                  */
 333                 acpi_ex_exit_interpreter();
 334
 335                 status = region_setup(region_obj, ACPI_REGION_ACTIVATE,
 336                                       handler_desc->address_space.context,
 337                                       &region_context);
 338
 339                 /* Re-enter the interpreter */
 340
 341                 status2 = acpi_ex_enter_interpreter();
 342                 if (ACPI_FAILURE(status2)) {
 343                         return_ACPI_STATUS(status2);
 344                 }
 345
 346                 /* Check for failure of the Region Setup */
 347
 348                 if (ACPI_FAILURE(status)) {
 349                         ACPI_EXCEPTION((AE_INFO, status,
 350                                         "During region initialization: [%s]",
 351                                         acpi_ut_get_region_name(region_obj->
 352                                                                 region.
 353                                                                 space_id)));
 354                         return_ACPI_STATUS(status);
 355                 }
 356
 357                 /*
 358                  * Region initialization may have been completed by region_setup
 359                  */
 360                 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
 361                         region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
 362
 363                         if (region_obj2->extra.region_context) {
 364                                 /* The handler for this region was already installed */
 365
 366                                 ACPI_MEM_FREE(region_context);
 367                         } else {
 368                                 /*
 369                                  * Save the returned context for use in all accesses to
 370                                  * this particular region
 371                                  */
 372                                 region_obj2->extra.region_context =
 373                                     region_context;
 374                         }
 375                 }
 376         }
 377
 378         /* We have everything we need, we can invoke the address space handler */
 379
 380         handler = handler_desc->address_space.handler;
 381
 382         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 383                           "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
 384                           &region_obj->region.handler->address_space, handler,
 385                           ACPI_FORMAT_UINT64(address),
 386                           acpi_ut_get_region_name(region_obj->region.
 387                                                   space_id)));
 388
 389         if (!
 390             (handler_desc->address_space.
 391              hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
 392                 /*
 393                  * For handlers other than the default (supplied) handlers, we must
 394                  * exit the interpreter because the handler *might* block -- we don't
 395                  * know what it will do, so we can't hold the lock on the intepreter.
 396                  */
 397                 acpi_ex_exit_interpreter();
 398         }
 399
 400         /* Call the handler */
 401
 402         status = handler(function, address, bit_width, value,
 403                          handler_desc->address_space.context,
 404                          region_obj2->extra.region_context);
 405
 406         if (ACPI_FAILURE(status)) {
 407                 ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]",
 408                                 acpi_ut_get_region_name(region_obj->region.
 409                                                         space_id)));
 410         }
 411
 412         if (!
 413             (handler_desc->address_space.
 414              hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
 415                 /*
 416                  * We just returned from a non-default handler, we must re-enter the
 417                  * interpreter
 418                  */
 419                 status2 = acpi_ex_enter_interpreter();
 420                 if (ACPI_FAILURE(status2)) {
 421                         return_ACPI_STATUS(status2);
 422                 }
 423         }
 424
 425         return_ACPI_STATUS(status);
 426 }
 427
 428 /*******************************************************************************
 429  *
 430  * FUNCTION:    acpi_ev_detach_region
 431  *
 432  * PARAMETERS:  region_obj          - Region Object
 433  *              acpi_ns_is_locked   - Namespace Region Already Locked?
 434  *
 435  * RETURN:      None
 436  *
 437  * DESCRIPTION: Break the association between the handler and the region
 438  *              this is a two way association.
 439  *
 440  ******************************************************************************/
 441
 442 void
 443 acpi_ev_detach_region(union acpi_operand_object *region_obj,
 444                       u8 acpi_ns_is_locked)
 445 {
 446         union acpi_operand_object *handler_obj;
 447         union acpi_operand_object *obj_desc;
 448         union acpi_operand_object **last_obj_ptr;
 449         acpi_adr_space_setup region_setup;
 450         void **region_context;
 451         union acpi_operand_object *region_obj2;
 452         acpi_status status;
 453
 454         ACPI_FUNCTION_TRACE("ev_detach_region");
 455
 456         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 457         if (!region_obj2) {
 458                 return_VOID;
 459         }
 460         region_context = &region_obj2->extra.region_context;
 461
 462         /* Get the address handler from the region object */
 463
 464         handler_obj = region_obj->region.handler;
 465         if (!handler_obj) {
 466                 /* This region has no handler, all done */
 467
 468                 return_VOID;
 469         }
 470
 471         /* Find this region in the handler's list */
 472
 473         obj_desc = handler_obj->address_space.region_list;
 474         last_obj_ptr = &handler_obj->address_space.region_list;
 475
 476         while (obj_desc) {
 477                 /* Is this the correct Region? */
 478
 479                 if (obj_desc == region_obj) {
 480                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 481                                           "Removing Region %p from address handler %p\n",
 482                                           region_obj, handler_obj));
 483
 484                         /* This is it, remove it from the handler's list */
 485
 486                         *last_obj_ptr = obj_desc->region.next;
 487                         obj_desc->region.next = NULL;   /* Must clear field */
 488
 489                         if (acpi_ns_is_locked) {
 490                                 status =
 491                                     acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 492                                 if (ACPI_FAILURE(status)) {
 493                                         return_VOID;
 494                                 }
 495                         }
 496
 497                         /* Now stop region accesses by executing the _REG method */
 498
 499                         status = acpi_ev_execute_reg_method(region_obj, 0);
 500                         if (ACPI_FAILURE(status)) {
 501                                 ACPI_EXCEPTION((AE_INFO, status,
 502                                                 "from region _REG, [%s]",
 503                                                 acpi_ut_get_region_name
 504                                                 (region_obj->region.space_id)));
 505                         }
 506
 507                         if (acpi_ns_is_locked) {
 508                                 status =
 509                                     acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 510                                 if (ACPI_FAILURE(status)) {
 511                                         return_VOID;
 512                                 }
 513                         }
 514
 515                         /* Call the setup handler with the deactivate notification */
 516
 517                         region_setup = handler_obj->address_space.setup;
 518                         status =
 519                             region_setup(region_obj, ACPI_REGION_DEACTIVATE,
 520                                          handler_obj->address_space.context,
 521                                          region_context);
 522
 523                         /* Init routine may fail, Just ignore errors */
 524
 525                         if (ACPI_FAILURE(status)) {
 526                                 ACPI_EXCEPTION((AE_INFO, status,
 527                                                 "from region init, [%s]",
 528                                                 acpi_ut_get_region_name
 529                                                 (region_obj->region.space_id)));
 530                         }
 531
 532                         region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);
 533
 534                         /*
 535                          * Remove handler reference in the region
 536                          *
 537                          * NOTE: this doesn't mean that the region goes away
 538                          * The region is just inaccessible as indicated to
 539                          * the _REG method
 540                          *
 541                          * If the region is on the handler's list
 542                          * this better be the region's handler
 543                          */
 544                         region_obj->region.handler = NULL;
 545                         acpi_ut_remove_reference(handler_obj);
 546
 547                         return_VOID;
 548                 }
 549
 550                 /* Walk the linked list of handlers */
 551
 552                 last_obj_ptr = &obj_desc->region.next;
 553                 obj_desc = obj_desc->region.next;
 554         }
 555
 556         /* If we get here, the region was not in the handler's region list */
 557
 558         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 559                           "Cannot remove region %p from address handler %p\n",
 560                           region_obj, handler_obj));
 561
 562         return_VOID;
 563 }
 564
 565 /*******************************************************************************
 566  *
 567  * FUNCTION:    acpi_ev_attach_region
 568  *
 569  * PARAMETERS:  handler_obj         - Handler Object
 570  *              region_obj          - Region Object
 571  *              acpi_ns_is_locked   - Namespace Region Already Locked?
 572  *
 573  * RETURN:      None
 574  *
 575  * DESCRIPTION: Create the association between the handler and the region
 576  *              this is a two way association.
 577  *
 578  ******************************************************************************/
 579
 580 acpi_status
 581 acpi_ev_attach_region(union acpi_operand_object *handler_obj,
 582                       union acpi_operand_object *region_obj,
 583                       u8 acpi_ns_is_locked)
 584 {
 585
 586         ACPI_FUNCTION_TRACE("ev_attach_region");
 587
 588         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 589                           "Adding Region [%4.4s] %p to address handler %p [%s]\n",
 590                           acpi_ut_get_node_name(region_obj->region.node),
 591                           region_obj, handler_obj,
 592                           acpi_ut_get_region_name(region_obj->region.
 593                                                   space_id)));
 594
 595         /* Link this region to the front of the handler's list */
 596
 597         region_obj->region.next = handler_obj->address_space.region_list;
 598         handler_obj->address_space.region_list = region_obj;
 599
 600         /* Install the region's handler */
 601
 602         if (region_obj->region.handler) {
 603                 return_ACPI_STATUS(AE_ALREADY_EXISTS);
 604         }
 605
 606         region_obj->region.handler = handler_obj;
 607         acpi_ut_add_reference(handler_obj);
 608
 609         return_ACPI_STATUS(AE_OK);
 610 }
 611
 612 /*******************************************************************************
 613  *
 614  * FUNCTION:    acpi_ev_install_handler
 615  *
 616  * PARAMETERS:  walk_namespace callback
 617  *
 618  * DESCRIPTION: This routine installs an address handler into objects that are
 619  *              of type Region or Device.
 620  *
 621  *              If the Object is a Device, and the device has a handler of
 622  *              the same type then the search is terminated in that branch.
 623  *
 624  *              This is because the existing handler is closer in proximity
 625  *              to any more regions than the one we are trying to install.
 626  *
 627  ******************************************************************************/
 628
 629 static acpi_status
 630 acpi_ev_install_handler(acpi_handle obj_handle,
 631                         u32 level, void *context, void **return_value)
 632 {
 633         union acpi_operand_object *handler_obj;
 634         union acpi_operand_object *next_handler_obj;
 635         union acpi_operand_object *obj_desc;
 636         struct acpi_namespace_node *node;
 637         acpi_status status;
 638
 639         ACPI_FUNCTION_NAME("ev_install_handler");
 640
 641         handler_obj = (union acpi_operand_object *)context;
 642
 643         /* Parameter validation */
 644
 645         if (!handler_obj) {
 646                 return (AE_OK);
 647         }
 648
 649         /* Convert and validate the device handle */
 650
 651         node = acpi_ns_map_handle_to_node(obj_handle);
 652         if (!node) {
 653                 return (AE_BAD_PARAMETER);
 654         }
 655
 656         /*
 657          * We only care about regions.and objects
 658          * that are allowed to have address space handlers
 659          */
 660         if ((node->type != ACPI_TYPE_DEVICE) &&
 661             (node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
 662                 return (AE_OK);
 663         }
 664
 665         /* Check for an existing internal object */
 666
 667         obj_desc = acpi_ns_get_attached_object(node);
 668         if (!obj_desc) {
 669                 /* No object, just exit */
 670
 671                 return (AE_OK);
 672         }
 673
 674         /* Devices are handled different than regions */
 675
 676         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_DEVICE) {
 677                 /* Check if this Device already has a handler for this address space */
 678
 679                 next_handler_obj = obj_desc->device.handler;
 680                 while (next_handler_obj) {
 681                         /* Found a handler, is it for the same address space? */
 682
 683                         if (next_handler_obj->address_space.space_id ==
 684                             handler_obj->address_space.space_id) {
 685                                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 686                                                   "Found handler for region [%s] in device %p(%p) handler %p\n",
 687                                                   acpi_ut_get_region_name
 688                                                   (handler_obj->address_space.
 689                                                    space_id), obj_desc,
 690                                                   next_handler_obj,
 691                                                   handler_obj));
 692
 693                                 /*
 694                                  * Since the object we found it on was a device, then it
 695                                  * means that someone has already installed a handler for
 696                                  * the branch of the namespace from this device on.  Just
 697                                  * bail out telling the walk routine to not traverse this
 698                                  * branch.  This preserves the scoping rule for handlers.
 699                                  */
 700                                 return (AE_CTRL_DEPTH);
 701                         }
 702
 703                         /* Walk the linked list of handlers attached to this device */
 704
 705                         next_handler_obj = next_handler_obj->address_space.next;
 706                 }
 707
 708                 /*
 709                  * As long as the device didn't have a handler for this
 710                  * space we don't care about it.  We just ignore it and
 711                  * proceed.
 712                  */
 713                 return (AE_OK);
 714         }
 715
 716         /* Object is a Region */
 717
 718         if (obj_desc->region.space_id != handler_obj->address_space.space_id) {
 719                 /*
 720                  * This region is for a different address space
 721                  * -- just ignore it
 722                  */
 723                 return (AE_OK);
 724         }
 725
 726         /*
 727          * Now we have a region and it is for the handler's address
 728          * space type.
 729          *
 730          * First disconnect region for any previous handler (if any)
 731          */
 732         acpi_ev_detach_region(obj_desc, FALSE);
 733
 734         /* Connect the region to the new handler */
 735
 736         status = acpi_ev_attach_region(handler_obj, obj_desc, FALSE);
 737         return (status);
 738 }
 739
 740 /*******************************************************************************
 741  *
 742  * FUNCTION:    acpi_ev_install_space_handler
 743  *
 744  * PARAMETERS:  Node            - Namespace node for the device
 745  *              space_id        - The address space ID
 746  *              Handler         - Address of the handler
 747  *              Setup           - Address of the setup function
 748  *              Context         - Value passed to the handler on each access
 749  *
 750  * RETURN:      Status
 751  *
 752  * DESCRIPTION: Install a handler for all op_regions of a given space_id.
 753  *              Assumes namespace is locked
 754  *
 755  ******************************************************************************/
 756
 757 acpi_status
 758 acpi_ev_install_space_handler(struct acpi_namespace_node * node,
 759                               acpi_adr_space_type space_id,
 760                               acpi_adr_space_handler handler,
 761                               acpi_adr_space_setup setup, void *context)
 762 {
 763         union acpi_operand_object *obj_desc;
 764         union acpi_operand_object *handler_obj;
 765         acpi_status status;
 766         acpi_object_type type;
 767         u16 flags = 0;
 768
 769         ACPI_FUNCTION_TRACE("ev_install_space_handler");
 770
 771         /*
 772          * This registration is valid for only the types below
 773          * and the root.  This is where the default handlers
 774          * get placed.
 775          */
 776         if ((node->type != ACPI_TYPE_DEVICE) &&
 777             (node->type != ACPI_TYPE_PROCESSOR) &&
 778             (node->type != ACPI_TYPE_THERMAL) && (node != acpi_gbl_root_node)) {
 779                 status = AE_BAD_PARAMETER;
 780                 goto unlock_and_exit;
 781         }
 782
 783         if (handler == ACPI_DEFAULT_HANDLER) {
 784                 flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;
 785
 786                 switch (space_id) {
 787                 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 788                         handler = acpi_ex_system_memory_space_handler;
 789                         setup = acpi_ev_system_memory_region_setup;
 790                         break;
 791
 792                 case ACPI_ADR_SPACE_SYSTEM_IO:
 793                         handler = acpi_ex_system_io_space_handler;
 794                         setup = acpi_ev_io_space_region_setup;
 795                         break;
 796
 797                 case ACPI_ADR_SPACE_PCI_CONFIG:
 798                         handler = acpi_ex_pci_config_space_handler;
 799                         setup = acpi_ev_pci_config_region_setup;
 800                         break;
 801
 802                 case ACPI_ADR_SPACE_CMOS:
 803                         handler = acpi_ex_cmos_space_handler;
 804                         setup = acpi_ev_cmos_region_setup;
 805                         break;
 806
 807                 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
 808                         handler = acpi_ex_pci_bar_space_handler;
 809                         setup = acpi_ev_pci_bar_region_setup;
 810                         break;
 811
 812                 case ACPI_ADR_SPACE_DATA_TABLE:
 813                         handler = acpi_ex_data_table_space_handler;
 814                         setup = NULL;
 815                         break;
 816
 817                 default:
 818                         status = AE_BAD_PARAMETER;
 819                         goto unlock_and_exit;
 820                 }
 821         }
 822
 823         /* If the caller hasn't specified a setup routine, use the default */
 824
 825         if (!setup) {
 826                 setup = acpi_ev_default_region_setup;
 827         }
 828
 829         /* Check for an existing internal object */
 830
 831         obj_desc = acpi_ns_get_attached_object(node);
 832         if (obj_desc) {
 833                 /*
 834                  * The attached device object already exists.
 835                  * Make sure the handler is not already installed.
 836                  */
 837                 handler_obj = obj_desc->device.handler;
 838
 839                 /* Walk the handler list for this device */
 840
 841                 while (handler_obj) {
 842                         /* Same space_id indicates a handler already installed */
 843
 844                         if (handler_obj->address_space.space_id == space_id) {
 845                                 if (handler_obj->address_space.handler ==
 846                                     handler) {
 847                                         /*
 848                                          * It is (relatively) OK to attempt to install the SAME
 849                                          * handler twice. This can easily happen
 850                                          * with PCI_Config space.
 851                                          */
 852                                         status = AE_SAME_HANDLER;
 853                                         goto unlock_and_exit;
 854                                 } else {
 855                                         /* A handler is already installed */
 856
 857                                         status = AE_ALREADY_EXISTS;
 858                                 }
 859                                 goto unlock_and_exit;
 860                         }
 861
 862                         /* Walk the linked list of handlers */
 863
 864                         handler_obj = handler_obj->address_space.next;
 865                 }
 866         } else {
 867                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 868                                   "Creating object on Device %p while installing handler\n",
 869                                   node));
 870
 871                 /* obj_desc does not exist, create one */
 872
 873                 if (node->type == ACPI_TYPE_ANY) {
 874                         type = ACPI_TYPE_DEVICE;
 875                 } else {
 876                         type = node->type;
 877                 }
 878
 879                 obj_desc = acpi_ut_create_internal_object(type);
 880                 if (!obj_desc) {
 881                         status = AE_NO_MEMORY;
 882                         goto unlock_and_exit;
 883                 }
 884
 885                 /* Init new descriptor */
 886
 887                 obj_desc->common.type = (u8) type;
 888
 889                 /* Attach the new object to the Node */
 890
 891                 status = acpi_ns_attach_object(node, obj_desc, type);
 892
 893                 /* Remove local reference to the object */
 894
 895                 acpi_ut_remove_reference(obj_desc);
 896
 897                 if (ACPI_FAILURE(status)) {
 898                         goto unlock_and_exit;
 899                 }
 900         }
 901
 902         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 903                           "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
 904                           acpi_ut_get_region_name(space_id), space_id,
 905                           acpi_ut_get_node_name(node), node, obj_desc));
 906
 907         /*
 908          * Install the handler
 909          *
 910          * At this point there is no existing handler.
 911          * Just allocate the object for the handler and link it
 912          * into the list.
 913          */
 914         handler_obj =
 915             acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
 916         if (!handler_obj) {
 917                 status = AE_NO_MEMORY;
 918                 goto unlock_and_exit;
 919         }
 920
 921         /* Init handler obj */
 922
 923         handler_obj->address_space.space_id = (u8) space_id;
 924         handler_obj->address_space.hflags = flags;
 925         handler_obj->address_space.region_list = NULL;
 926         handler_obj->address_space.node = node;
 927         handler_obj->address_space.handler = handler;
 928         handler_obj->address_space.context = context;
 929         handler_obj->address_space.setup = setup;
 930
 931         /* Install at head of Device.address_space list */
 932
 933         handler_obj->address_space.next = obj_desc->device.handler;
 934
 935         /*
 936          * The Device object is the first reference on the handler_obj.
 937          * Each region that uses the handler adds a reference.
 938          */
 939         obj_desc->device.handler = handler_obj;
 940
 941         /*
 942          * Walk the namespace finding all of the regions this
 943          * handler will manage.
 944          *
 945          * Start at the device and search the branch toward
 946          * the leaf nodes until either the leaf is encountered or
 947          * a device is detected that has an address handler of the
 948          * same type.
 949          *
 950          * In either case, back up and search down the remainder
 951          * of the branch
 952          */
 953         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
 954                                         ACPI_NS_WALK_UNLOCK,
 955                                         acpi_ev_install_handler, handler_obj,
 956                                         NULL);
 957
 958       unlock_and_exit:
 959         return_ACPI_STATUS(status);
 960 }
 961
 962 /*******************************************************************************
 963  *
 964  * FUNCTION:    acpi_ev_execute_reg_methods
 965  *
 966  * PARAMETERS:  Node            - Namespace node for the device
 967  *              space_id        - The address space ID
 968  *
 969  * RETURN:      Status
 970  *
 971  * DESCRIPTION: Run all _REG methods for the input Space ID;
 972  *              Note: assumes namespace is locked, or system init time.
 973  *
 974  ******************************************************************************/
 975
 976 acpi_status
 977 acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
 978                             acpi_adr_space_type space_id)
 979 {
 980         acpi_status status;
 981
 982         ACPI_FUNCTION_TRACE("ev_execute_reg_methods");
 983
 984         /*
 985          * Run all _REG methods for all Operation Regions for this
 986          * space ID.  This is a separate walk in order to handle any
 987          * interdependencies between regions and _REG methods.  (i.e. handlers
 988          * must be installed for all regions of this Space ID before we
 989          * can run any _REG methods)
 990          */
 991         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
 992                                         ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
 993                                         &space_id, NULL);
 994
 995         return_ACPI_STATUS(status);
 996 }
 997
 998 /*******************************************************************************
 999  *
1000  * FUNCTION:    acpi_ev_reg_run
1001  *
1002  * PARAMETERS:  walk_namespace callback
1003  *
1004  * DESCRIPTION: Run _REg method for region objects of the requested space_iD
1005  *
1006  ******************************************************************************/
1007
1008 static acpi_status
1009 acpi_ev_reg_run(acpi_handle obj_handle,
1010                 u32 level, void *context, void **return_value)
1011 {
1012         union acpi_operand_object *obj_desc;
1013         struct acpi_namespace_node *node;
1014         acpi_adr_space_type space_id;
1015         acpi_status status;
1016
1017         space_id = *ACPI_CAST_PTR(acpi_adr_space_type, context);
1018
1019         /* Convert and validate the device handle */
1020
1021         node = acpi_ns_map_handle_to_node(obj_handle);
1022         if (!node) {
1023                 return (AE_BAD_PARAMETER);
1024         }
1025
1026         /*
1027          * We only care about regions.and objects
1028          * that are allowed to have address space handlers
1029          */
1030         if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
1031                 return (AE_OK);
1032         }
1033
1034         /* Check for an existing internal object */
1035
1036         obj_desc = acpi_ns_get_attached_object(node);
1037         if (!obj_desc) {
1038                 /* No object, just exit */
1039
1040                 return (AE_OK);
1041         }
1042
1043         /* Object is a Region */
1044
1045         if (obj_desc->region.space_id != space_id) {
1046                 /*
1047                  * This region is for a different address space
1048                  * -- just ignore it
1049                  */
1050                 return (AE_OK);
1051         }
1052
1053         status = acpi_ev_execute_reg_method(obj_desc, 1);
1054         return (status);
1055 }