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
 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_status status2;
 295         acpi_adr_space_handler handler;
 296         acpi_adr_space_setup region_setup;
 297         union acpi_operand_object *handler_desc;
 298         union acpi_operand_object *region_obj2;
 299         void *region_context = NULL;
 300
 301         ACPI_FUNCTION_TRACE(ev_address_space_dispatch);
 302
 303         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 304         if (!region_obj2) {
 305                 return_ACPI_STATUS(AE_NOT_EXIST);
 306         }
 307
 308         /* Ensure that there is a handler associated with this region */
 309
 310         handler_desc = region_obj->region.handler;
 311         if (!handler_desc) {
 312                 ACPI_ERROR((AE_INFO,
 313                             "No handler for Region [%4.4s] (%p) [%s]",
 314                             acpi_ut_get_node_name(region_obj->region.node),
 315                             region_obj,
 316                             acpi_ut_get_region_name(region_obj->region.
 317                                                     space_id)));
 318
 319                 return_ACPI_STATUS(AE_NOT_EXIST);
 320         }
 321
 322         /*
 323          * It may be the case that the region has never been initialized
 324          * Some types of regions require special init code
 325          */
 326         if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
 327                 /*
 328                  * This region has not been initialized yet, do it
 329                  */
 330                 region_setup = handler_desc->address_space.setup;
 331                 if (!region_setup) {
 332
 333                         /* No initialization routine, exit with error */
 334
 335                         ACPI_ERROR((AE_INFO,
 336                                     "No init routine for region(%p) [%s]",
 337                                     region_obj,
 338                                     acpi_ut_get_region_name(region_obj->region.
 339                                                             space_id)));
 340                         return_ACPI_STATUS(AE_NOT_EXIST);
 341                 }
 342
 343                 /*
 344                  * We must exit the interpreter because the region
 345                  * setup will potentially execute control methods
 346                  * (e.g., _REG method for this region)
 347                  */
 348                 acpi_ex_exit_interpreter();
 349
 350                 status = region_setup(region_obj, ACPI_REGION_ACTIVATE,
 351                                       handler_desc->address_space.context,
 352                                       &region_context);
 353
 354                 /* Re-enter the interpreter */
 355
 356                 status2 = acpi_ex_enter_interpreter();
 357                 if (ACPI_FAILURE(status2)) {
 358                         return_ACPI_STATUS(status2);
 359                 }
 360
 361                 /* Check for failure of the Region Setup */
 362
 363                 if (ACPI_FAILURE(status)) {
 364                         ACPI_EXCEPTION((AE_INFO, status,
 365                                         "During region initialization: [%s]",
 366                                         acpi_ut_get_region_name(region_obj->
 367                                                                 region.
 368                                                                 space_id)));
 369                         return_ACPI_STATUS(status);
 370                 }
 371
 372                 /*
 373                  * Region initialization may have been completed by region_setup
 374                  */
 375                 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
 376                         region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
 377
 378                         if (region_obj2->extra.region_context) {
 379
 380                                 /* The handler for this region was already installed */
 381
 382                                 ACPI_FREE(region_context);
 383                         } else {
 384                                 /*
 385                                  * Save the returned context for use in all accesses to
 386                                  * this particular region
 387                                  */
 388                                 region_obj2->extra.region_context =
 389                                     region_context;
 390                         }
 391                 }
 392         }
 393
 394         /* We have everything we need, we can invoke the address space handler */
 395
 396         handler = handler_desc->address_space.handler;
 397
 398         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 399                           "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
 400                           &region_obj->region.handler->address_space, handler,
 401                           ACPI_FORMAT_UINT64(address),
 402                           acpi_ut_get_region_name(region_obj->region.
 403                                                   space_id)));
 404
 405         if (!(handler_desc->address_space.handler_flags &
 406               ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
 407                 /*
 408                  * For handlers other than the default (supplied) handlers, we must
 409                  * exit the interpreter because the handler *might* block -- we don't
 410                  * know what it will do, so we can't hold the lock on the intepreter.
 411                  */
 412                 acpi_ex_exit_interpreter();
 413         }
 414
 415         /* Call the handler */
 416
 417         status = handler(function, address, bit_width, value,
 418                          handler_desc->address_space.context,
 419                          region_obj2->extra.region_context);
 420
 421         if (ACPI_FAILURE(status)) {
 422                 ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]",
 423                                 acpi_ut_get_region_name(region_obj->region.
 424                                                         space_id)));
 425         }
 426
 427         if (!(handler_desc->address_space.handler_flags &
 428               ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
 429                 /*
 430                  * We just returned from a non-default handler, we must re-enter the
 431                  * interpreter
 432                  */
 433                 status2 = acpi_ex_enter_interpreter();
 434                 if (ACPI_FAILURE(status2)) {
 435                         return_ACPI_STATUS(status2);
 436                 }
 437         }
 438
 439         return_ACPI_STATUS(status);
 440 }
 441
 442 /*******************************************************************************
 443  *
 444  * FUNCTION:    acpi_ev_detach_region
 445  *
 446  * PARAMETERS:  region_obj          - Region Object
 447  *              acpi_ns_is_locked   - Namespace Region Already Locked?
 448  *
 449  * RETURN:      None
 450  *
 451  * DESCRIPTION: Break the association between the handler and the region
 452  *              this is a two way association.
 453  *
 454  ******************************************************************************/
 455
 456 void
 457 acpi_ev_detach_region(union acpi_operand_object *region_obj,
 458                       u8 acpi_ns_is_locked)
 459 {
 460         union acpi_operand_object *handler_obj;
 461         union acpi_operand_object *obj_desc;
 462         union acpi_operand_object **last_obj_ptr;
 463         acpi_adr_space_setup region_setup;
 464         void **region_context;
 465         union acpi_operand_object *region_obj2;
 466         acpi_status status;
 467
 468         ACPI_FUNCTION_TRACE(ev_detach_region);
 469
 470         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 471         if (!region_obj2) {
 472                 return_VOID;
 473         }
 474         region_context = &region_obj2->extra.region_context;
 475
 476         /* Get the address handler from the region object */
 477
 478         handler_obj = region_obj->region.handler;
 479         if (!handler_obj) {
 480
 481                 /* This region has no handler, all done */
 482
 483                 return_VOID;
 484         }
 485
 486         /* Find this region in the handler's list */
 487
 488         obj_desc = handler_obj->address_space.region_list;
 489         last_obj_ptr = &handler_obj->address_space.region_list;
 490
 491         while (obj_desc) {
 492
 493                 /* Is this the correct Region? */
 494
 495                 if (obj_desc == region_obj) {
 496                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 497                                           "Removing Region %p from address handler %p\n",
 498                                           region_obj, handler_obj));
 499
 500                         /* This is it, remove it from the handler's list */
 501
 502                         *last_obj_ptr = obj_desc->region.next;
 503                         obj_desc->region.next = NULL;   /* Must clear field */
 504
 505                         if (acpi_ns_is_locked) {
 506                                 status =
 507                                     acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 508                                 if (ACPI_FAILURE(status)) {
 509                                         return_VOID;
 510                                 }
 511                         }
 512
 513                         /* Now stop region accesses by executing the _REG method */
 514
 515                         status = acpi_ev_execute_reg_method(region_obj, 0);
 516                         if (ACPI_FAILURE(status)) {
 517                                 ACPI_EXCEPTION((AE_INFO, status,
 518                                                 "from region _REG, [%s]",
 519                                                 acpi_ut_get_region_name
 520                                                 (region_obj->region.space_id)));
 521                         }
 522
 523                         if (acpi_ns_is_locked) {
 524                                 status =
 525                                     acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 526                                 if (ACPI_FAILURE(status)) {
 527                                         return_VOID;
 528                                 }
 529                         }
 530
 531                         /* Call the setup handler with the deactivate notification */
 532
 533                         region_setup = handler_obj->address_space.setup;
 534                         status =
 535                             region_setup(region_obj, ACPI_REGION_DEACTIVATE,
 536                                          handler_obj->address_space.context,
 537                                          region_context);
 538
 539                         /* Init routine may fail, Just ignore errors */
 540
 541                         if (ACPI_FAILURE(status)) {
 542                                 ACPI_EXCEPTION((AE_INFO, status,
 543                                                 "from region init, [%s]",
 544                                                 acpi_ut_get_region_name
 545                                                 (region_obj->region.space_id)));
 546                         }
 547
 548                         region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);
 549
 550                         /*
 551                          * Remove handler reference in the region
 552                          *
 553                          * NOTE: this doesn't mean that the region goes away
 554                          * The region is just inaccessible as indicated to
 555                          * the _REG method
 556                          *
 557                          * If the region is on the handler's list
 558                          * this better be the region's handler
 559                          */
 560                         region_obj->region.handler = NULL;
 561                         acpi_ut_remove_reference(handler_obj);
 562
 563                         return_VOID;
 564                 }
 565
 566                 /* Walk the linked list of handlers */
 567
 568                 last_obj_ptr = &obj_desc->region.next;
 569                 obj_desc = obj_desc->region.next;
 570         }
 571
 572         /* If we get here, the region was not in the handler's region list */
 573
 574         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 575                           "Cannot remove region %p from address handler %p\n",
 576                           region_obj, handler_obj));
 577
 578         return_VOID;
 579 }
 580
 581 /*******************************************************************************
 582  *
 583  * FUNCTION:    acpi_ev_attach_region
 584  *
 585  * PARAMETERS:  handler_obj         - Handler Object
 586  *              region_obj          - Region Object
 587  *              acpi_ns_is_locked   - Namespace Region Already Locked?
 588  *
 589  * RETURN:      None
 590  *
 591  * DESCRIPTION: Create the association between the handler and the region
 592  *              this is a two way association.
 593  *
 594  ******************************************************************************/
 595
 596 acpi_status
 597 acpi_ev_attach_region(union acpi_operand_object *handler_obj,
 598                       union acpi_operand_object *region_obj,
 599                       u8 acpi_ns_is_locked)
 600 {
 601
 602         ACPI_FUNCTION_TRACE(ev_attach_region);
 603
 604         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 605                           "Adding Region [%4.4s] %p to address handler %p [%s]\n",
 606                           acpi_ut_get_node_name(region_obj->region.node),
 607                           region_obj, handler_obj,
 608                           acpi_ut_get_region_name(region_obj->region.
 609                                                   space_id)));
 610
 611         /* Link this region to the front of the handler's list */
 612
 613         region_obj->region.next = handler_obj->address_space.region_list;
 614         handler_obj->address_space.region_list = region_obj;
 615
 616         /* Install the region's handler */
 617
 618         if (region_obj->region.handler) {
 619                 return_ACPI_STATUS(AE_ALREADY_EXISTS);
 620         }
 621
 622         region_obj->region.handler = handler_obj;
 623         acpi_ut_add_reference(handler_obj);
 624
 625         return_ACPI_STATUS(AE_OK);
 626 }
 627
 628 /*******************************************************************************
 629  *
 630  * FUNCTION:    acpi_ev_install_handler
 631  *
 632  * PARAMETERS:  walk_namespace callback
 633  *
 634  * DESCRIPTION: This routine installs an address handler into objects that are
 635  *              of type Region or Device.
 636  *
 637  *              If the Object is a Device, and the device has a handler of
 638  *              the same type then the search is terminated in that branch.
 639  *
 640  *              This is because the existing handler is closer in proximity
 641  *              to any more regions than the one we are trying to install.
 642  *
 643  ******************************************************************************/
 644
 645 static acpi_status
 646 acpi_ev_install_handler(acpi_handle obj_handle,
 647                         u32 level, void *context, void **return_value)
 648 {
 649         union acpi_operand_object *handler_obj;
 650         union acpi_operand_object *next_handler_obj;
 651         union acpi_operand_object *obj_desc;
 652         struct acpi_namespace_node *node;
 653         acpi_status status;
 654
 655         ACPI_FUNCTION_NAME(ev_install_handler);
 656
 657         handler_obj = (union acpi_operand_object *)context;
 658
 659         /* Parameter validation */
 660
 661         if (!handler_obj) {
 662                 return (AE_OK);
 663         }
 664
 665         /* Convert and validate the device handle */
 666
 667         node = acpi_ns_map_handle_to_node(obj_handle);
 668         if (!node) {
 669                 return (AE_BAD_PARAMETER);
 670         }
 671
 672         /*
 673          * We only care about regions.and objects
 674          * that are allowed to have address space handlers
 675          */
 676         if ((node->type != ACPI_TYPE_DEVICE) &&
 677             (node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
 678                 return (AE_OK);
 679         }
 680
 681         /* Check for an existing internal object */
 682
 683         obj_desc = acpi_ns_get_attached_object(node);
 684         if (!obj_desc) {
 685
 686                 /* No object, just exit */
 687
 688                 return (AE_OK);
 689         }
 690
 691         /* Devices are handled different than regions */
 692
 693         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_DEVICE) {
 694
 695                 /* Check if this Device already has a handler for this address space */
 696
 697                 next_handler_obj = obj_desc->device.handler;
 698                 while (next_handler_obj) {
 699
 700                         /* Found a handler, is it for the same address space? */
 701
 702                         if (next_handler_obj->address_space.space_id ==
 703                             handler_obj->address_space.space_id) {
 704                                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 705                                                   "Found handler for region [%s] in device %p(%p) handler %p\n",
 706                                                   acpi_ut_get_region_name
 707                                                   (handler_obj->address_space.
 708                                                    space_id), obj_desc,
 709                                                   next_handler_obj,
 710                                                   handler_obj));
 711
 712                                 /*
 713                                  * Since the object we found it on was a device, then it
 714                                  * means that someone has already installed a handler for
 715                                  * the branch of the namespace from this device on.  Just
 716                                  * bail out telling the walk routine to not traverse this
 717                                  * branch.  This preserves the scoping rule for handlers.
 718                                  */
 719                                 return (AE_CTRL_DEPTH);
 720                         }
 721
 722                         /* Walk the linked list of handlers attached to this device */
 723
 724                         next_handler_obj = next_handler_obj->address_space.next;
 725                 }
 726
 727                 /*
 728                  * As long as the device didn't have a handler for this
 729                  * space we don't care about it.  We just ignore it and
 730                  * 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
 740                  * -- just ignore it
 741                  */
 742                 return (AE_OK);
 743         }
 744
 745         /*
 746          * Now we have a region and it is for the handler's address
 747          * space type.
 748          *
 749          * First disconnect region for any previous handler (if any)
 750          */
 751         acpi_ev_detach_region(obj_desc, FALSE);
 752
 753         /* Connect the region to the new handler */
 754
 755         status = acpi_ev_attach_region(handler_obj, obj_desc, FALSE);
 756         return (status);
 757 }
 758
 759 /*******************************************************************************
 760  *
 761  * FUNCTION:    acpi_ev_install_space_handler
 762  *
 763  * PARAMETERS:  Node            - Namespace node for the device
 764  *              space_id        - The address space ID
 765  *              Handler         - Address of the handler
 766  *              Setup           - Address of the setup function
 767  *              Context         - Value passed to the handler on each access
 768  *
 769  * RETURN:      Status
 770  *
 771  * DESCRIPTION: Install a handler for all op_regions of a given space_id.
 772  *              Assumes namespace is locked
 773  *
 774  ******************************************************************************/
 775
 776 acpi_status
 777 acpi_ev_install_space_handler(struct acpi_namespace_node * node,
 778                               acpi_adr_space_type space_id,
 779                               acpi_adr_space_handler handler,
 780                               acpi_adr_space_setup setup, void *context)
 781 {
 782         union acpi_operand_object *obj_desc;
 783         union acpi_operand_object *handler_obj;
 784         acpi_status status;
 785         acpi_object_type type;
 786         u8 flags = 0;
 787
 788         ACPI_FUNCTION_TRACE(ev_install_space_handler);
 789
 790         /*
 791          * This registration is valid for only the types below
 792          * and the root.  This is where the default handlers
 793          * get placed.
 794          */
 795         if ((node->type != ACPI_TYPE_DEVICE) &&
 796             (node->type != ACPI_TYPE_PROCESSOR) &&
 797             (node->type != ACPI_TYPE_THERMAL) && (node != acpi_gbl_root_node)) {
 798                 status = AE_BAD_PARAMETER;
 799                 goto unlock_and_exit;
 800         }
 801
 802         if (handler == ACPI_DEFAULT_HANDLER) {
 803                 flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;
 804
 805                 switch (space_id) {
 806                 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 807                         handler = acpi_ex_system_memory_space_handler;
 808                         setup = acpi_ev_system_memory_region_setup;
 809                         break;
 810
 811                 case ACPI_ADR_SPACE_SYSTEM_IO:
 812                         handler = acpi_ex_system_io_space_handler;
 813                         setup = acpi_ev_io_space_region_setup;
 814                         break;
 815
 816                 case ACPI_ADR_SPACE_PCI_CONFIG:
 817                         handler = acpi_ex_pci_config_space_handler;
 818                         setup = acpi_ev_pci_config_region_setup;
 819                         break;
 820
 821                 case ACPI_ADR_SPACE_CMOS:
 822                         handler = acpi_ex_cmos_space_handler;
 823                         setup = acpi_ev_cmos_region_setup;
 824                         break;
 825
 826                 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
 827                         handler = acpi_ex_pci_bar_space_handler;
 828                         setup = acpi_ev_pci_bar_region_setup;
 829                         break;
 830
 831                 case ACPI_ADR_SPACE_DATA_TABLE:
 832                         handler = acpi_ex_data_table_space_handler;
 833                         setup = NULL;
 834                         break;
 835
 836                 default:
 837                         status = AE_BAD_PARAMETER;
 838                         goto unlock_and_exit;
 839                 }
 840         }
 841
 842         /* If the caller hasn't specified a setup routine, use the default */
 843
 844         if (!setup) {
 845                 setup = acpi_ev_default_region_setup;
 846         }
 847
 848         /* Check for an existing internal object */
 849
 850         obj_desc = acpi_ns_get_attached_object(node);
 851         if (obj_desc) {
 852                 /*
 853                  * The attached device object already exists.
 854                  * Make sure the handler is not already installed.
 855                  */
 856                 handler_obj = obj_desc->device.handler;
 857
 858                 /* Walk the handler list for this device */
 859
 860                 while (handler_obj) {
 861
 862                         /* Same space_id indicates a handler already installed */
 863
 864                         if (handler_obj->address_space.space_id == space_id) {
 865                                 if (handler_obj->address_space.handler ==
 866                                     handler) {
 867                                         /*
 868                                          * It is (relatively) OK to attempt to install the SAME
 869                                          * handler twice. This can easily happen
 870                                          * with PCI_Config space.
 871                                          */
 872                                         status = AE_SAME_HANDLER;
 873                                         goto unlock_and_exit;
 874                                 } else {
 875                                         /* A handler is already installed */
 876
 877                                         status = AE_ALREADY_EXISTS;
 878                                 }
 879                                 goto unlock_and_exit;
 880                         }
 881
 882                         /* Walk the linked list of handlers */
 883
 884                         handler_obj = handler_obj->address_space.next;
 885                 }
 886         } else {
 887                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 888                                   "Creating object on Device %p while installing handler\n",
 889                                   node));
 890
 891                 /* obj_desc does not exist, create one */
 892
 893                 if (node->type == ACPI_TYPE_ANY) {
 894                         type = ACPI_TYPE_DEVICE;
 895                 } else {
 896                         type = node->type;
 897                 }
 898
 899                 obj_desc = acpi_ut_create_internal_object(type);
 900                 if (!obj_desc) {
 901                         status = AE_NO_MEMORY;
 902                         goto unlock_and_exit;
 903                 }
 904
 905                 /* Init new descriptor */
 906
 907                 obj_desc->common.type = (u8) type;
 908
 909                 /* Attach the new object to the Node */
 910
 911                 status = acpi_ns_attach_object(node, obj_desc, type);
 912
 913                 /* Remove local reference to the object */
 914
 915                 acpi_ut_remove_reference(obj_desc);
 916
 917                 if (ACPI_FAILURE(status)) {
 918                         goto unlock_and_exit;
 919                 }
 920         }
 921
 922         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 923                           "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
 924                           acpi_ut_get_region_name(space_id), space_id,
 925                           acpi_ut_get_node_name(node), node, obj_desc));
 926
 927         /*
 928          * Install the handler
 929          *
 930          * At this point there is no existing handler.
 931          * Just allocate the object for the handler and link it
 932          * into the list.
 933          */
 934         handler_obj =
 935             acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
 936         if (!handler_obj) {
 937                 status = AE_NO_MEMORY;
 938                 goto unlock_and_exit;
 939         }
 940
 941         /* Init handler obj */
 942
 943         handler_obj->address_space.space_id = (u8) space_id;
 944         handler_obj->address_space.handler_flags = flags;
 945         handler_obj->address_space.region_list = NULL;
 946         handler_obj->address_space.node = node;
 947         handler_obj->address_space.handler = handler;
 948         handler_obj->address_space.context = context;
 949         handler_obj->address_space.setup = setup;
 950
 951         /* Install at head of Device.address_space list */
 952
 953         handler_obj->address_space.next = obj_desc->device.handler;
 954
 955         /*
 956          * The Device object is the first reference on the handler_obj.
 957          * Each region that uses the handler adds a reference.
 958          */
 959         obj_desc->device.handler = handler_obj;
 960
 961         /*
 962          * Walk the namespace finding all of the regions this
 963          * handler will manage.
 964          *
 965          * Start at the device and search the branch toward
 966          * the leaf nodes until either the leaf is encountered or
 967          * a device is detected that has an address handler of the
 968          * same type.
 969          *
 970          * In either case, back up and search down the remainder
 971          * of the branch
 972          */
 973         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
 974                                         ACPI_NS_WALK_UNLOCK,
 975                                         acpi_ev_install_handler, handler_obj,
 976                                         NULL);
 977
 978       unlock_and_exit:
 979         return_ACPI_STATUS(status);
 980 }
 981
 982 /*******************************************************************************
 983  *
 984  * FUNCTION:    acpi_ev_execute_reg_methods
 985  *
 986  * PARAMETERS:  Node            - Namespace node for the device
 987  *              space_id        - The address space ID
 988  *
 989  * RETURN:      Status
 990  *
 991  * DESCRIPTION: Run all _REG methods for the input Space ID;
 992  *              Note: assumes namespace is locked, or system init time.
 993  *
 994  ******************************************************************************/
 995
 996 acpi_status
 997 acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
 998                             acpi_adr_space_type space_id)
 999 {
1000         acpi_status status;
1001
1002         ACPI_FUNCTION_TRACE(ev_execute_reg_methods);
1003
1004         /*
1005          * Run all _REG methods for all Operation Regions for this
1006          * space ID.  This is a separate walk in order to handle any
1007          * interdependencies between regions and _REG methods.  (i.e. handlers
1008          * must be installed for all regions of this Space ID before we
1009          * can run any _REG methods)
1010          */
1011         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
1012                                         ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
1013                                         &space_id, NULL);
1014
1015         return_ACPI_STATUS(status);
1016 }
1017
1018 /*******************************************************************************
1019  *
1020  * FUNCTION:    acpi_ev_reg_run
1021  *
1022  * PARAMETERS:  walk_namespace callback
1023  *
1024  * DESCRIPTION: Run _REG method for region objects of the requested space_iD
1025  *
1026  ******************************************************************************/
1027
1028 static acpi_status
1029 acpi_ev_reg_run(acpi_handle obj_handle,
1030                 u32 level, void *context, void **return_value)
1031 {
1032         union acpi_operand_object *obj_desc;
1033         struct acpi_namespace_node *node;
1034         acpi_adr_space_type space_id;
1035         acpi_status status;
1036
1037         space_id = *ACPI_CAST_PTR(acpi_adr_space_type, context);
1038
1039         /* Convert and validate the device handle */
1040
1041         node = acpi_ns_map_handle_to_node(obj_handle);
1042         if (!node) {
1043                 return (AE_BAD_PARAMETER);
1044         }
1045
1046         /*
1047          * We only care about regions.and objects
1048          * that are allowed to have address space handlers
1049          */
1050         if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
1051                 return (AE_OK);
1052         }
1053
1054         /* Check for an existing internal object */
1055
1056         obj_desc = acpi_ns_get_attached_object(node);
1057         if (!obj_desc) {
1058
1059                 /* No object, just exit */
1060
1061                 return (AE_OK);
1062         }
1063
1064         /* Object is a Region */
1065
1066         if (obj_desc->region.space_id != space_id) {
1067                 /*
1068                  * This region is for a different address space
1069                  * -- just ignore it
1070                  */
1071                 return (AE_OK);
1072         }
1073
1074         status = acpi_ev_execute_reg_method(obj_desc, 1);
1075         return (status);
1076 }