drivers/acpi/acpica/evregion.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evregion - ACPI address_space (op_region) handler dispatch
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2011, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acevents.h"
  47 #include "acnamesp.h"
  48 #include "acinterp.h"
  49
  50 #define _COMPONENT          ACPI_EVENTS
  51 ACPI_MODULE_NAME("evregion")
  52
  53 /* Local prototypes */
  54 static u8
  55 acpi_ev_has_default_handler(struct acpi_namespace_node *node,
  56                             acpi_adr_space_type space_id);
  57
  58 static acpi_status
  59 acpi_ev_reg_run(acpi_handle obj_handle,
  60                 u32 level, void *context, void **return_value);
  61
  62 static acpi_status
  63 acpi_ev_install_handler(acpi_handle obj_handle,
  64                         u32 level, void *context, void **return_value);
  65
  66 /* These are the address spaces that will get default handlers */
  67
  68 #define ACPI_NUM_DEFAULT_SPACES     4
  69
  70 static u8 acpi_gbl_default_address_spaces[ACPI_NUM_DEFAULT_SPACES] = {
  71         ACPI_ADR_SPACE_SYSTEM_MEMORY,
  72         ACPI_ADR_SPACE_SYSTEM_IO,
  73         ACPI_ADR_SPACE_PCI_CONFIG,
  74         ACPI_ADR_SPACE_DATA_TABLE
  75 };
  76
  77 /*******************************************************************************
  78  *
  79  * FUNCTION:    acpi_ev_install_region_handlers
  80  *
  81  * PARAMETERS:  None
  82  *
  83  * RETURN:      Status
  84  *
  85  * DESCRIPTION: Installs the core subsystem default address space handlers.
  86  *
  87  ******************************************************************************/
  88
  89 acpi_status acpi_ev_install_region_handlers(void)
  90 {
  91         acpi_status status;
  92         u32 i;
  93
  94         ACPI_FUNCTION_TRACE(ev_install_region_handlers);
  95
  96         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  97         if (ACPI_FAILURE(status)) {
  98                 return_ACPI_STATUS(status);
  99         }
 100
 101         /*
 102          * All address spaces (PCI Config, EC, SMBus) are scope dependent and
 103          * registration must occur for a specific device.
 104          *
 105          * In the case of the system memory and IO address spaces there is
 106          * currently no device associated with the address space. For these we
 107          * use the root.
 108          *
 109          * We install the default PCI config space handler at the root so that
 110          * this space is immediately available even though the we have not
 111          * enumerated all the PCI Root Buses yet. This is to conform to the ACPI
 112          * specification which states that the PCI config space must be always
 113          * available -- even though we are nowhere near ready to find the PCI root
 114          * buses at this point.
 115          *
 116          * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler
 117          * has already been installed (via acpi_install_address_space_handler).
 118          * Similar for AE_SAME_HANDLER.
 119          */
 120         for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
 121                 status = acpi_ev_install_space_handler(acpi_gbl_root_node,
 122                                                        acpi_gbl_default_address_spaces
 123                                                        [i],
 124                                                        ACPI_DEFAULT_HANDLER,
 125                                                        NULL, NULL);
 126                 switch (status) {
 127                 case AE_OK:
 128                 case AE_SAME_HANDLER:
 129                 case AE_ALREADY_EXISTS:
 130
 131                         /* These exceptions are all OK */
 132
 133                         status = AE_OK;
 134                         break;
 135
 136                 default:
 137
 138                         goto unlock_and_exit;
 139                 }
 140         }
 141
 142       unlock_and_exit:
 143         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 144         return_ACPI_STATUS(status);
 145 }
 146
 147 /*******************************************************************************
 148  *
 149  * FUNCTION:    acpi_ev_has_default_handler
 150  *
 151  * PARAMETERS:  Node                - Namespace node for the device
 152  *              space_id            - The address space ID
 153  *
 154  * RETURN:      TRUE if default handler is installed, FALSE otherwise
 155  *
 156  * DESCRIPTION: Check if the default handler is installed for the requested
 157  *              space ID.
 158  *
 159  ******************************************************************************/
 160
 161 static u8
 162 acpi_ev_has_default_handler(struct acpi_namespace_node *node,
 163                             acpi_adr_space_type space_id)
 164 {
 165         union acpi_operand_object *obj_desc;
 166         union acpi_operand_object *handler_obj;
 167
 168         /* Must have an existing internal object */
 169
 170         obj_desc = acpi_ns_get_attached_object(node);
 171         if (obj_desc) {
 172                 handler_obj = obj_desc->device.handler;
 173
 174                 /* Walk the linked list of handlers for this object */
 175
 176                 while (handler_obj) {
 177                         if (handler_obj->address_space.space_id == space_id) {
 178                                 if (handler_obj->address_space.handler_flags &
 179                                     ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
 180                                         return (TRUE);
 181                                 }
 182                         }
 183
 184                         handler_obj = handler_obj->address_space.next;
 185                 }
 186         }
 187
 188         return (FALSE);
 189 }
 190
 191 /*******************************************************************************
 192  *
 193  * FUNCTION:    acpi_ev_initialize_op_regions
 194  *
 195  * PARAMETERS:  None
 196  *
 197  * RETURN:      Status
 198  *
 199  * DESCRIPTION: Execute _REG methods for all Operation Regions that have
 200  *              an installed default region handler.
 201  *
 202  ******************************************************************************/
 203
 204 acpi_status acpi_ev_initialize_op_regions(void)
 205 {
 206         acpi_status status;
 207         u32 i;
 208
 209         ACPI_FUNCTION_TRACE(ev_initialize_op_regions);
 210
 211         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 212         if (ACPI_FAILURE(status)) {
 213                 return_ACPI_STATUS(status);
 214         }
 215
 216         /* Run the _REG methods for op_regions in each default address space */
 217
 218         for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
 219                 /*
 220                  * Make sure the installed handler is the DEFAULT handler. If not the
 221                  * default, the _REG methods will have already been run (when the
 222                  * handler was installed)
 223                  */
 224                 if (acpi_ev_has_default_handler(acpi_gbl_root_node,
 225                                                 acpi_gbl_default_address_spaces
 226                                                 [i])) {
 227                         status =
 228                             acpi_ev_execute_reg_methods(acpi_gbl_root_node,
 229                                                         acpi_gbl_default_address_spaces
 230                                                         [i]);
 231                 }
 232         }
 233
 234         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 235         return_ACPI_STATUS(status);
 236 }
 237
 238 /*******************************************************************************
 239  *
 240  * FUNCTION:    acpi_ev_execute_reg_method
 241  *
 242  * PARAMETERS:  region_obj          - Region object
 243  *              Function            - Passed to _REG: On (1) or Off (0)
 244  *
 245  * RETURN:      Status
 246  *
 247  * DESCRIPTION: Execute _REG method for a region
 248  *
 249  ******************************************************************************/
 250
 251 acpi_status
 252 acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
 253 {
 254         struct acpi_evaluate_info *info;
 255         union acpi_operand_object *args[3];
 256         union acpi_operand_object *region_obj2;
 257         acpi_status status;
 258
 259         ACPI_FUNCTION_TRACE(ev_execute_reg_method);
 260
 261         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 262         if (!region_obj2) {
 263                 return_ACPI_STATUS(AE_NOT_EXIST);
 264         }
 265
 266         if (region_obj2->extra.method_REG == NULL) {
 267                 return_ACPI_STATUS(AE_OK);
 268         }
 269
 270         /* Allocate and initialize the evaluation information block */
 271
 272         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 273         if (!info) {
 274                 return_ACPI_STATUS(AE_NO_MEMORY);
 275         }
 276
 277         info->prefix_node = region_obj2->extra.method_REG;
 278         info->pathname = NULL;
 279         info->parameters = args;
 280         info->flags = ACPI_IGNORE_RETURN_VALUE;
 281
 282         /*
 283          * The _REG method has two arguments:
 284          *
 285          * Arg0 - Integer:
 286          *  Operation region space ID Same value as region_obj->Region.space_id
 287          *
 288          * Arg1 - Integer:
 289          *  connection status 1 for connecting the handler, 0 for disconnecting
 290          *  the handler (Passed as a parameter)
 291          */
 292         args[0] =
 293             acpi_ut_create_integer_object((u64) region_obj->region.space_id);
 294         if (!args[0]) {
 295                 status = AE_NO_MEMORY;
 296                 goto cleanup1;
 297         }
 298
 299         args[1] = acpi_ut_create_integer_object((u64) function);
 300         if (!args[1]) {
 301                 status = AE_NO_MEMORY;
 302                 goto cleanup2;
 303         }
 304
 305         args[2] = NULL;         /* Terminate list */
 306
 307         /* Execute the method, no return value */
 308
 309         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 310                         (ACPI_TYPE_METHOD, info->prefix_node, NULL));
 311
 312         status = acpi_ns_evaluate(info);
 313         acpi_ut_remove_reference(args[1]);
 314
 315       cleanup2:
 316         acpi_ut_remove_reference(args[0]);
 317
 318       cleanup1:
 319         ACPI_FREE(info);
 320         return_ACPI_STATUS(status);
 321 }
 322
 323 /*******************************************************************************
 324  *
 325  * FUNCTION:    acpi_ev_address_space_dispatch
 326  *
 327  * PARAMETERS:  region_obj          - Internal region object
 328  *              Function            - Read or Write operation
 329  *              region_offset       - Where in the region to read or write
 330  *              bit_width           - Field width in bits (8, 16, 32, or 64)
 331  *              Value               - Pointer to in or out value, must be
 332  *                                    a full 64-bit integer
 333  *
 334  * RETURN:      Status
 335  *
 336  * DESCRIPTION: Dispatch an address space or operation region access to
 337  *              a previously installed handler.
 338  *
 339  ******************************************************************************/
 340
 341 acpi_status
 342 acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
 343                                u32 function,
 344                                u32 region_offset, u32 bit_width, u64 *value)
 345 {
 346         acpi_status status;
 347         acpi_adr_space_handler handler;
 348         acpi_adr_space_setup region_setup;
 349         union acpi_operand_object *handler_desc;
 350         union acpi_operand_object *region_obj2;
 351         void *region_context = NULL;
 352
 353         ACPI_FUNCTION_TRACE(ev_address_space_dispatch);
 354
 355         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 356         if (!region_obj2) {
 357                 return_ACPI_STATUS(AE_NOT_EXIST);
 358         }
 359
 360         /* Ensure that there is a handler associated with this region */
 361
 362         handler_desc = region_obj->region.handler;
 363         if (!handler_desc) {
 364                 ACPI_ERROR((AE_INFO,
 365                             "No handler for Region [%4.4s] (%p) [%s]",
 366                             acpi_ut_get_node_name(region_obj->region.node),
 367                             region_obj,
 368                             acpi_ut_get_region_name(region_obj->region.
 369                                                     space_id)));
 370
 371                 return_ACPI_STATUS(AE_NOT_EXIST);
 372         }
 373
 374         /*
 375          * It may be the case that the region has never been initialized.
 376          * Some types of regions require special init code
 377          */
 378         if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
 379
 380                 /* This region has not been initialized yet, do it */
 381
 382                 region_setup = handler_desc->address_space.setup;
 383                 if (!region_setup) {
 384
 385                         /* No initialization routine, exit with error */
 386
 387                         ACPI_ERROR((AE_INFO,
 388                                     "No init routine for region(%p) [%s]",
 389                                     region_obj,
 390                                     acpi_ut_get_region_name(region_obj->region.
 391                                                             space_id)));
 392                         return_ACPI_STATUS(AE_NOT_EXIST);
 393                 }
 394
 395                 /*
 396                  * We must exit the interpreter because the region setup will
 397                  * potentially execute control methods (for example, the _REG method
 398                  * for this region)
 399                  */
 400                 acpi_ex_exit_interpreter();
 401
 402                 status = region_setup(region_obj, ACPI_REGION_ACTIVATE,
 403                                       handler_desc->address_space.context,
 404                                       &region_context);
 405
 406                 /* Re-enter the interpreter */
 407
 408                 acpi_ex_enter_interpreter();
 409
 410                 /* Check for failure of the Region Setup */
 411
 412                 if (ACPI_FAILURE(status)) {
 413                         ACPI_EXCEPTION((AE_INFO, status,
 414                                         "During region initialization: [%s]",
 415                                         acpi_ut_get_region_name(region_obj->
 416                                                                 region.
 417                                                                 space_id)));
 418                         return_ACPI_STATUS(status);
 419                 }
 420
 421                 /* Region initialization may have been completed by region_setup */
 422
 423                 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
 424                         region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
 425
 426                         if (region_obj2->extra.region_context) {
 427
 428                                 /* The handler for this region was already installed */
 429
 430                                 ACPI_FREE(region_context);
 431                         } else {
 432                                 /*
 433                                  * Save the returned context for use in all accesses to
 434                                  * this particular region
 435                                  */
 436                                 region_obj2->extra.region_context =
 437                                     region_context;
 438                         }
 439                 }
 440         }
 441
 442         /* We have everything we need, we can invoke the address space handler */
 443
 444         handler = handler_desc->address_space.handler;
 445
 446         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 447                           "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
 448                           &region_obj->region.handler->address_space, handler,
 449                           ACPI_FORMAT_NATIVE_UINT(region_obj->region.address +
 450                                                   region_offset),
 451                           acpi_ut_get_region_name(region_obj->region.
 452                                                   space_id)));
 453
 454         if (!(handler_desc->address_space.handler_flags &
 455               ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
 456                 /*
 457                  * For handlers other than the default (supplied) handlers, we must
 458                  * exit the interpreter because the handler *might* block -- we don't
 459                  * know what it will do, so we can't hold the lock on the intepreter.
 460                  */
 461                 acpi_ex_exit_interpreter();
 462         }
 463
 464         /* Call the handler */
 465
 466         status = handler(function,
 467                          (region_obj->region.address + region_offset),
 468                          bit_width, value, handler_desc->address_space.context,
 469                          region_obj2->extra.region_context);
 470
 471         if (ACPI_FAILURE(status)) {
 472                 ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]",
 473                                 acpi_ut_get_region_name(region_obj->region.
 474                                                         space_id)));
 475         }
 476
 477         if (!(handler_desc->address_space.handler_flags &
 478               ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
 479                 /*
 480                  * We just returned from a non-default handler, we must re-enter the
 481                  * interpreter
 482                  */
 483                 acpi_ex_enter_interpreter();
 484         }
 485
 486         return_ACPI_STATUS(status);
 487 }
 488
 489 /*******************************************************************************
 490  *
 491  * FUNCTION:    acpi_ev_detach_region
 492  *
 493  * PARAMETERS:  region_obj          - Region Object
 494  *              acpi_ns_is_locked   - Namespace Region Already Locked?
 495  *
 496  * RETURN:      None
 497  *
 498  * DESCRIPTION: Break the association between the handler and the region
 499  *              this is a two way association.
 500  *
 501  ******************************************************************************/
 502
 503 void
 504 acpi_ev_detach_region(union acpi_operand_object *region_obj,
 505                       u8 acpi_ns_is_locked)
 506 {
 507         union acpi_operand_object *handler_obj;
 508         union acpi_operand_object *obj_desc;
 509         union acpi_operand_object **last_obj_ptr;
 510         acpi_adr_space_setup region_setup;
 511         void **region_context;
 512         union acpi_operand_object *region_obj2;
 513         acpi_status status;
 514
 515         ACPI_FUNCTION_TRACE(ev_detach_region);
 516
 517         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 518         if (!region_obj2) {
 519                 return_VOID;
 520         }
 521         region_context = &region_obj2->extra.region_context;
 522
 523         /* Get the address handler from the region object */
 524
 525         handler_obj = region_obj->region.handler;
 526         if (!handler_obj) {
 527
 528                 /* This region has no handler, all done */
 529
 530                 return_VOID;
 531         }
 532
 533         /* Find this region in the handler's list */
 534
 535         obj_desc = handler_obj->address_space.region_list;
 536         last_obj_ptr = &handler_obj->address_space.region_list;
 537
 538         while (obj_desc) {
 539
 540                 /* Is this the correct Region? */
 541
 542                 if (obj_desc == region_obj) {
 543                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 544                                           "Removing Region %p from address handler %p\n",
 545                                           region_obj, handler_obj));
 546
 547                         /* This is it, remove it from the handler's list */
 548
 549                         *last_obj_ptr = obj_desc->region.next;
 550                         obj_desc->region.next = NULL;   /* Must clear field */
 551
 552                         if (acpi_ns_is_locked) {
 553                                 status =
 554                                     acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 555                                 if (ACPI_FAILURE(status)) {
 556                                         return_VOID;
 557                                 }
 558                         }
 559
 560                         /* Now stop region accesses by executing the _REG method */
 561
 562                         status = acpi_ev_execute_reg_method(region_obj, 0);
 563                         if (ACPI_FAILURE(status)) {
 564                                 ACPI_EXCEPTION((AE_INFO, status,
 565                                                 "from region _REG, [%s]",
 566                                                 acpi_ut_get_region_name
 567                                                 (region_obj->region.space_id)));
 568                         }
 569
 570                         if (acpi_ns_is_locked) {
 571                                 status =
 572                                     acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 573                                 if (ACPI_FAILURE(status)) {
 574                                         return_VOID;
 575                                 }
 576                         }
 577
 578                         /*
 579                          * If the region has been activated, call the setup handler with
 580                          * the deactivate notification
 581                          */
 582                         if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
 583                                 region_setup = handler_obj->address_space.setup;
 584                                 status =
 585                                     region_setup(region_obj,
 586                                                  ACPI_REGION_DEACTIVATE,
 587                                                  handler_obj->address_space.
 588                                                  context, region_context);
 589
 590                                 /* Init routine may fail, Just ignore errors */
 591
 592                                 if (ACPI_FAILURE(status)) {
 593                                         ACPI_EXCEPTION((AE_INFO, status,
 594                                                         "from region handler - deactivate, [%s]",
 595                                                         acpi_ut_get_region_name
 596                                                         (region_obj->region.
 597                                                          space_id)));
 598                                 }
 599
 600                                 region_obj->region.flags &=
 601                                     ~(AOPOBJ_SETUP_COMPLETE);
 602                         }
 603
 604                         /*
 605                          * Remove handler reference in the region
 606                          *
 607                          * NOTE: this doesn't mean that the region goes away, the region
 608                          * is just inaccessible as indicated to the _REG method
 609                          *
 610                          * If the region is on the handler's list, this must be the
 611                          * region's handler
 612                          */
 613                         region_obj->region.handler = NULL;
 614                         acpi_ut_remove_reference(handler_obj);
 615
 616                         return_VOID;
 617                 }
 618
 619                 /* Walk the linked list of handlers */
 620
 621                 last_obj_ptr = &obj_desc->region.next;
 622                 obj_desc = obj_desc->region.next;
 623         }
 624
 625         /* If we get here, the region was not in the handler's region list */
 626
 627         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 628                           "Cannot remove region %p from address handler %p\n",
 629                           region_obj, handler_obj));
 630
 631         return_VOID;
 632 }
 633
 634 /*******************************************************************************
 635  *
 636  * FUNCTION:    acpi_ev_attach_region
 637  *
 638  * PARAMETERS:  handler_obj         - Handler Object
 639  *              region_obj          - Region Object
 640  *              acpi_ns_is_locked   - Namespace Region Already Locked?
 641  *
 642  * RETURN:      None
 643  *
 644  * DESCRIPTION: Create the association between the handler and the region
 645  *              this is a two way association.
 646  *
 647  ******************************************************************************/
 648
 649 acpi_status
 650 acpi_ev_attach_region(union acpi_operand_object *handler_obj,
 651                       union acpi_operand_object *region_obj,
 652                       u8 acpi_ns_is_locked)
 653 {
 654
 655         ACPI_FUNCTION_TRACE(ev_attach_region);
 656
 657         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 658                           "Adding Region [%4.4s] %p to address handler %p [%s]\n",
 659                           acpi_ut_get_node_name(region_obj->region.node),
 660                           region_obj, handler_obj,
 661                           acpi_ut_get_region_name(region_obj->region.
 662                                                   space_id)));
 663
 664         /* Link this region to the front of the handler's list */
 665
 666         region_obj->region.next = handler_obj->address_space.region_list;
 667         handler_obj->address_space.region_list = region_obj;
 668
 669         /* Install the region's handler */
 670
 671         if (region_obj->region.handler) {
 672                 return_ACPI_STATUS(AE_ALREADY_EXISTS);
 673         }
 674
 675         region_obj->region.handler = handler_obj;
 676         acpi_ut_add_reference(handler_obj);
 677
 678         return_ACPI_STATUS(AE_OK);
 679 }
 680
 681 /*******************************************************************************
 682  *
 683  * FUNCTION:    acpi_ev_install_handler
 684  *
 685  * PARAMETERS:  walk_namespace callback
 686  *
 687  * DESCRIPTION: This routine installs an address handler into objects that are
 688  *              of type Region or Device.
 689  *
 690  *              If the Object is a Device, and the device has a handler of
 691  *              the same type then the search is terminated in that branch.
 692  *
 693  *              This is because the existing handler is closer in proximity
 694  *              to any more regions than the one we are trying to install.
 695  *
 696  ******************************************************************************/
 697
 698 static acpi_status
 699 acpi_ev_install_handler(acpi_handle obj_handle,
 700                         u32 level, void *context, void **return_value)
 701 {
 702         union acpi_operand_object *handler_obj;
 703         union acpi_operand_object *next_handler_obj;
 704         union acpi_operand_object *obj_desc;
 705         struct acpi_namespace_node *node;
 706         acpi_status status;
 707
 708         ACPI_FUNCTION_NAME(ev_install_handler);
 709
 710         handler_obj = (union acpi_operand_object *)context;
 711
 712         /* Parameter validation */
 713
 714         if (!handler_obj) {
 715                 return (AE_OK);
 716         }
 717
 718         /* Convert and validate the device handle */
 719
 720         node = acpi_ns_validate_handle(obj_handle);
 721         if (!node) {
 722                 return (AE_BAD_PARAMETER);
 723         }
 724
 725         /*
 726          * We only care about regions and objects that are allowed to have
 727          * address space handlers
 728          */
 729         if ((node->type != ACPI_TYPE_DEVICE) &&
 730             (node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
 731                 return (AE_OK);
 732         }
 733
 734         /* Check for an existing internal object */
 735
 736         obj_desc = acpi_ns_get_attached_object(node);
 737         if (!obj_desc) {
 738
 739                 /* No object, just exit */
 740
 741                 return (AE_OK);
 742         }
 743
 744         /* Devices are handled different than regions */
 745
 746         if (obj_desc->common.type == ACPI_TYPE_DEVICE) {
 747
 748                 /* Check if this Device already has a handler for this address space */
 749
 750                 next_handler_obj = obj_desc->device.handler;
 751                 while (next_handler_obj) {
 752
 753                         /* Found a handler, is it for the same address space? */
 754
 755                         if (next_handler_obj->address_space.space_id ==
 756                             handler_obj->address_space.space_id) {
 757                                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 758                                                   "Found handler for region [%s] in device %p(%p) "
 759                                                   "handler %p\n",
 760                                                   acpi_ut_get_region_name
 761                                                   (handler_obj->address_space.
 762                                                    space_id), obj_desc,
 763                                                   next_handler_obj,
 764                                                   handler_obj));
 765
 766                                 /*
 767                                  * Since the object we found it on was a device, then it
 768                                  * means that someone has already installed a handler for
 769                                  * the branch of the namespace from this device on. Just
 770                                  * bail out telling the walk routine to not traverse this
 771                                  * branch. This preserves the scoping rule for handlers.
 772                                  */
 773                                 return (AE_CTRL_DEPTH);
 774                         }
 775
 776                         /* Walk the linked list of handlers attached to this device */
 777
 778                         next_handler_obj = next_handler_obj->address_space.next;
 779                 }
 780
 781                 /*
 782                  * As long as the device didn't have a handler for this space we
 783                  * don't care about it. We just ignore it and proceed.
 784                  */
 785                 return (AE_OK);
 786         }
 787
 788         /* Object is a Region */
 789
 790         if (obj_desc->region.space_id != handler_obj->address_space.space_id) {
 791
 792                 /* This region is for a different address space, just ignore it */
 793
 794                 return (AE_OK);
 795         }
 796
 797         /*
 798          * Now we have a region and it is for the handler's address space type.
 799          *
 800          * First disconnect region for any previous handler (if any)
 801          */
 802         acpi_ev_detach_region(obj_desc, FALSE);
 803
 804         /* Connect the region to the new handler */
 805
 806         status = acpi_ev_attach_region(handler_obj, obj_desc, FALSE);
 807         return (status);
 808 }
 809
 810 /*******************************************************************************
 811  *
 812  * FUNCTION:    acpi_ev_install_space_handler
 813  *
 814  * PARAMETERS:  Node            - Namespace node for the device
 815  *              space_id        - The address space ID
 816  *              Handler         - Address of the handler
 817  *              Setup           - Address of the setup function
 818  *              Context         - Value passed to the handler on each access
 819  *
 820  * RETURN:      Status
 821  *
 822  * DESCRIPTION: Install a handler for all op_regions of a given space_id.
 823  *              Assumes namespace is locked
 824  *
 825  ******************************************************************************/
 826
 827 acpi_status
 828 acpi_ev_install_space_handler(struct acpi_namespace_node * node,
 829                               acpi_adr_space_type space_id,
 830                               acpi_adr_space_handler handler,
 831                               acpi_adr_space_setup setup, void *context)
 832 {
 833         union acpi_operand_object *obj_desc;
 834         union acpi_operand_object *handler_obj;
 835         acpi_status status;
 836         acpi_object_type type;
 837         u8 flags = 0;
 838
 839         ACPI_FUNCTION_TRACE(ev_install_space_handler);
 840
 841         /*
 842          * This registration is valid for only the types below and the root. This
 843          * is where the default handlers get placed.
 844          */
 845         if ((node->type != ACPI_TYPE_DEVICE) &&
 846             (node->type != ACPI_TYPE_PROCESSOR) &&
 847             (node->type != ACPI_TYPE_THERMAL) && (node != acpi_gbl_root_node)) {
 848                 status = AE_BAD_PARAMETER;
 849                 goto unlock_and_exit;
 850         }
 851
 852         if (handler == ACPI_DEFAULT_HANDLER) {
 853                 flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;
 854
 855                 switch (space_id) {
 856                 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 857                         handler = acpi_ex_system_memory_space_handler;
 858                         setup = acpi_ev_system_memory_region_setup;
 859                         break;
 860
 861                 case ACPI_ADR_SPACE_SYSTEM_IO:
 862                         handler = acpi_ex_system_io_space_handler;
 863                         setup = acpi_ev_io_space_region_setup;
 864                         break;
 865
 866                 case ACPI_ADR_SPACE_PCI_CONFIG:
 867                         handler = acpi_ex_pci_config_space_handler;
 868                         setup = acpi_ev_pci_config_region_setup;
 869                         break;
 870
 871                 case ACPI_ADR_SPACE_CMOS:
 872                         handler = acpi_ex_cmos_space_handler;
 873                         setup = acpi_ev_cmos_region_setup;
 874                         break;
 875
 876                 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
 877                         handler = acpi_ex_pci_bar_space_handler;
 878                         setup = acpi_ev_pci_bar_region_setup;
 879                         break;
 880
 881                 case ACPI_ADR_SPACE_DATA_TABLE:
 882                         handler = acpi_ex_data_table_space_handler;
 883                         setup = NULL;
 884                         break;
 885
 886                 default:
 887                         status = AE_BAD_PARAMETER;
 888                         goto unlock_and_exit;
 889                 }
 890         }
 891
 892         /* If the caller hasn't specified a setup routine, use the default */
 893
 894         if (!setup) {
 895                 setup = acpi_ev_default_region_setup;
 896         }
 897
 898         /* Check for an existing internal object */
 899
 900         obj_desc = acpi_ns_get_attached_object(node);
 901         if (obj_desc) {
 902                 /*
 903                  * The attached device object already exists. Make sure the handler
 904                  * is not already installed.
 905                  */
 906                 handler_obj = obj_desc->device.handler;
 907
 908                 /* Walk the handler list for this device */
 909
 910                 while (handler_obj) {
 911
 912                         /* Same space_id indicates a handler already installed */
 913
 914                         if (handler_obj->address_space.space_id == space_id) {
 915                                 if (handler_obj->address_space.handler ==
 916                                     handler) {
 917                                         /*
 918                                          * It is (relatively) OK to attempt to install the SAME
 919                                          * handler twice. This can easily happen with the
 920                                          * PCI_Config space.
 921                                          */
 922                                         status = AE_SAME_HANDLER;
 923                                         goto unlock_and_exit;
 924                                 } else {
 925                                         /* A handler is already installed */
 926
 927                                         status = AE_ALREADY_EXISTS;
 928                                 }
 929                                 goto unlock_and_exit;
 930                         }
 931
 932                         /* Walk the linked list of handlers */
 933
 934                         handler_obj = handler_obj->address_space.next;
 935                 }
 936         } else {
 937                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 938                                   "Creating object on Device %p while installing handler\n",
 939                                   node));
 940
 941                 /* obj_desc does not exist, create one */
 942
 943                 if (node->type == ACPI_TYPE_ANY) {
 944                         type = ACPI_TYPE_DEVICE;
 945                 } else {
 946                         type = node->type;
 947                 }
 948
 949                 obj_desc = acpi_ut_create_internal_object(type);
 950                 if (!obj_desc) {
 951                         status = AE_NO_MEMORY;
 952                         goto unlock_and_exit;
 953                 }
 954
 955                 /* Init new descriptor */
 956
 957                 obj_desc->common.type = (u8) type;
 958
 959                 /* Attach the new object to the Node */
 960
 961                 status = acpi_ns_attach_object(node, obj_desc, type);
 962
 963                 /* Remove local reference to the object */
 964
 965                 acpi_ut_remove_reference(obj_desc);
 966
 967                 if (ACPI_FAILURE(status)) {
 968                         goto unlock_and_exit;
 969                 }
 970         }
 971
 972         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 973                           "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
 974                           acpi_ut_get_region_name(space_id), space_id,
 975                           acpi_ut_get_node_name(node), node, obj_desc));
 976
 977         /*
 978          * Install the handler
 979          *
 980          * At this point there is no existing handler. Just allocate the object
 981          * for the handler and link it into the list.
 982          */
 983         handler_obj =
 984             acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
 985         if (!handler_obj) {
 986                 status = AE_NO_MEMORY;
 987                 goto unlock_and_exit;
 988         }
 989
 990         /* Init handler obj */
 991
 992         handler_obj->address_space.space_id = (u8) space_id;
 993         handler_obj->address_space.handler_flags = flags;
 994         handler_obj->address_space.region_list = NULL;
 995         handler_obj->address_space.node = node;
 996         handler_obj->address_space.handler = handler;
 997         handler_obj->address_space.context = context;
 998         handler_obj->address_space.setup = setup;
 999
1000         /* Install at head of Device.address_space list */
1001
1002         handler_obj->address_space.next = obj_desc->device.handler;
1003
1004         /*
1005          * The Device object is the first reference on the handler_obj.
1006          * Each region that uses the handler adds a reference.
1007          */
1008         obj_desc->device.handler = handler_obj;
1009
1010         /*
1011          * Walk the namespace finding all of the regions this
1012          * handler will manage.
1013          *
1014          * Start at the device and search the branch toward
1015          * the leaf nodes until either the leaf is encountered or
1016          * a device is detected that has an address handler of the
1017          * same type.
1018          *
1019          * In either case, back up and search down the remainder
1020          * of the branch
1021          */
1022         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
1023                                         ACPI_NS_WALK_UNLOCK,
1024                                         acpi_ev_install_handler, NULL,
1025                                         handler_obj, NULL);
1026
1027       unlock_and_exit:
1028         return_ACPI_STATUS(status);
1029 }
1030
1031 /*******************************************************************************
1032  *
1033  * FUNCTION:    acpi_ev_execute_reg_methods
1034  *
1035  * PARAMETERS:  Node            - Namespace node for the device
1036  *              space_id        - The address space ID
1037  *
1038  * RETURN:      Status
1039  *
1040  * DESCRIPTION: Run all _REG methods for the input Space ID;
1041  *              Note: assumes namespace is locked, or system init time.
1042  *
1043  ******************************************************************************/
1044
1045 acpi_status
1046 acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
1047                             acpi_adr_space_type space_id)
1048 {
1049         acpi_status status;
1050
1051         ACPI_FUNCTION_TRACE(ev_execute_reg_methods);
1052
1053         /*
1054          * Run all _REG methods for all Operation Regions for this space ID. This
1055          * is a separate walk in order to handle any interdependencies between
1056          * regions and _REG methods. (i.e. handlers must be installed for all
1057          * regions of this Space ID before we can run any _REG methods)
1058          */
1059         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
1060                                         ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
1061                                         NULL, &space_id, NULL);
1062
1063         return_ACPI_STATUS(status);
1064 }
1065
1066 /*******************************************************************************
1067  *
1068  * FUNCTION:    acpi_ev_reg_run
1069  *
1070  * PARAMETERS:  walk_namespace callback
1071  *
1072  * DESCRIPTION: Run _REG method for region objects of the requested space_iD
1073  *
1074  ******************************************************************************/
1075
1076 static acpi_status
1077 acpi_ev_reg_run(acpi_handle obj_handle,
1078                 u32 level, void *context, void **return_value)
1079 {
1080         union acpi_operand_object *obj_desc;
1081         struct acpi_namespace_node *node;
1082         acpi_adr_space_type space_id;
1083         acpi_status status;
1084
1085         space_id = *ACPI_CAST_PTR(acpi_adr_space_type, context);
1086
1087         /* Convert and validate the device handle */
1088
1089         node = acpi_ns_validate_handle(obj_handle);
1090         if (!node) {
1091                 return (AE_BAD_PARAMETER);
1092         }
1093
1094         /*
1095          * We only care about regions.and objects that are allowed to have address
1096          * space handlers
1097          */
1098         if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
1099                 return (AE_OK);
1100         }
1101
1102         /* Check for an existing internal object */
1103
1104         obj_desc = acpi_ns_get_attached_object(node);
1105         if (!obj_desc) {
1106
1107                 /* No object, just exit */
1108
1109                 return (AE_OK);
1110         }
1111
1112         /* Object is a Region */
1113
1114         if (obj_desc->region.space_id != space_id) {
1115
1116                 /* This region is for a different address space, just ignore it */
1117
1118                 return (AE_OK);
1119         }
1120
1121         status = acpi_ev_execute_reg_method(obj_desc, 1);
1122         return (status);
1123 }