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 - 2005, 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
  45 #include <acpi/acpi.h>
  46 #include <acpi/acevents.h>
  47 #include <acpi/acnamesp.h>
  48 #include <acpi/acinterp.h>
  49
  50 #define _COMPONENT          ACPI_EVENTS
  51          ACPI_MODULE_NAME    ("evregion")
  52
  53 #define ACPI_NUM_DEFAULT_SPACES     4
  54
  55 static u8                   acpi_gbl_default_address_spaces[ACPI_NUM_DEFAULT_SPACES] = {
  56                          ACPI_ADR_SPACE_SYSTEM_MEMORY,
  57                          ACPI_ADR_SPACE_SYSTEM_IO,
  58                          ACPI_ADR_SPACE_PCI_CONFIG,
  59                          ACPI_ADR_SPACE_DATA_TABLE};
  60
  61
  62 /*******************************************************************************
  63  *
  64  * FUNCTION:    acpi_ev_install_region_handlers
  65  *
  66  * PARAMETERS:  None
  67  *
  68  * RETURN:      Status
  69  *
  70  * DESCRIPTION: Installs the core subsystem default address space handlers.
  71  *
  72  ******************************************************************************/
  73
  74 acpi_status
  75 acpi_ev_install_region_handlers (
  76         void) {
  77         acpi_status                     status;
  78         acpi_native_uint                i;
  79
  80
  81         ACPI_FUNCTION_TRACE ("ev_install_region_handlers");
  82
  83
  84         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
  85         if (ACPI_FAILURE (status)) {
  86                 return_ACPI_STATUS (status);
  87         }
  88
  89         /*
  90          * All address spaces (PCI Config, EC, SMBus) are scope dependent
  91          * and registration must occur for a specific device.
  92          *
  93          * In the case of the system memory and IO address spaces there is currently
  94          * no device associated with the address space.  For these we use the root.
  95          *
  96          * We install the default PCI config space handler at the root so
  97          * that this space is immediately available even though the we have
  98          * not enumerated all the PCI Root Buses yet.  This is to conform
  99          * to the ACPI specification which states that the PCI config
 100          * space must be always available -- even though we are nowhere
 101          * near ready to find the PCI root buses at this point.
 102          *
 103          * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler
 104          * has already been installed (via acpi_install_address_space_handler).
 105          * Similar for AE_SAME_HANDLER.
 106          */
 107         for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
 108                 status = acpi_ev_install_space_handler (acpi_gbl_root_node,
 109                                   acpi_gbl_default_address_spaces[i],
 110                                   ACPI_DEFAULT_HANDLER, NULL, NULL);
 111                 switch (status) {
 112                 case AE_OK:
 113                 case AE_SAME_HANDLER:
 114                 case AE_ALREADY_EXISTS:
 115
 116                         /* These exceptions are all OK */
 117
 118                         status = AE_OK;
 119                         break;
 120
 121                 default:
 122
 123                         goto unlock_and_exit;
 124                 }
 125         }
 126
 127 unlock_and_exit:
 128         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 129         return_ACPI_STATUS (status);
 130 }
 131
 132
 133 /*******************************************************************************
 134  *
 135  * FUNCTION:    acpi_ev_initialize_op_regions
 136  *
 137  * PARAMETERS:  None
 138  *
 139  * RETURN:      Status
 140  *
 141  * DESCRIPTION: Execute _REG methods for all Operation Regions that have
 142  *              an installed default region handler.
 143  *
 144  ******************************************************************************/
 145
 146 acpi_status
 147 acpi_ev_initialize_op_regions (
 148         void)
 149 {
 150         acpi_status                     status;
 151         acpi_native_uint                i;
 152
 153
 154         ACPI_FUNCTION_TRACE ("ev_initialize_op_regions");
 155
 156
 157         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 158         if (ACPI_FAILURE (status)) {
 159                 return_ACPI_STATUS (status);
 160         }
 161
 162         /*
 163          * Run the _REG methods for op_regions in each default address space
 164          */
 165         for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
 166                 /* TBD: Make sure handler is the DEFAULT handler, otherwise
 167                  * _REG will have already been run.
 168                  */
 169                 status = acpi_ev_execute_reg_methods (acpi_gbl_root_node,
 170                                   acpi_gbl_default_address_spaces[i]);
 171         }
 172
 173         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 174         return_ACPI_STATUS (status);
 175 }
 176
 177
 178 /*******************************************************************************
 179  *
 180  * FUNCTION:    acpi_ev_execute_reg_method
 181  *
 182  * PARAMETERS:  region_obj          - Object structure
 183  *              Function            - Passed to _REG:  On (1) or Off (0)
 184  *
 185  * RETURN:      Status
 186  *
 187  * DESCRIPTION: Execute _REG method for a region
 188  *
 189  ******************************************************************************/
 190
 191 acpi_status
 192 acpi_ev_execute_reg_method (
 193         union acpi_operand_object       *region_obj,
 194         u32                             function)
 195 {
 196         struct acpi_parameter_info      info;
 197         union acpi_operand_object       *params[3];
 198         union acpi_operand_object       *region_obj2;
 199         acpi_status                     status;
 200
 201
 202         ACPI_FUNCTION_TRACE ("ev_execute_reg_method");
 203
 204
 205         region_obj2 = acpi_ns_get_secondary_object (region_obj);
 206         if (!region_obj2) {
 207                 return_ACPI_STATUS (AE_NOT_EXIST);
 208         }
 209
 210         if (region_obj2->extra.method_REG == NULL) {
 211                 return_ACPI_STATUS (AE_OK);
 212         }
 213
 214         /*
 215          * The _REG method has two arguments:
 216          *
 217          * Arg0, Integer: Operation region space ID
 218          *          Same value as region_obj->Region.space_id
 219          * Arg1, Integer: connection status
 220          *          1 for connecting the handler,
 221          *          0 for disconnecting the handler
 222          *          Passed as a parameter
 223          */
 224         params[0] = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
 225         if (!params[0]) {
 226                 return_ACPI_STATUS (AE_NO_MEMORY);
 227         }
 228
 229         params[1] = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
 230         if (!params[1]) {
 231                 status = AE_NO_MEMORY;
 232                 goto cleanup;
 233         }
 234
 235         /* Setup the parameter objects */
 236
 237         params[0]->integer.value = region_obj->region.space_id;
 238         params[1]->integer.value = function;
 239         params[2] = NULL;
 240
 241         info.node = region_obj2->extra.method_REG;
 242         info.parameters = params;
 243         info.parameter_type = ACPI_PARAM_ARGS;
 244
 245         /* Execute the method, no return value */
 246
 247         ACPI_DEBUG_EXEC (acpi_ut_display_init_pathname (
 248                            ACPI_TYPE_METHOD, info.node, NULL));
 249         status = acpi_ns_evaluate_by_handle (&info);
 250
 251         acpi_ut_remove_reference (params[1]);
 252
 253 cleanup:
 254         acpi_ut_remove_reference (params[0]);
 255
 256         return_ACPI_STATUS (status);
 257 }
 258
 259
 260 /*******************************************************************************
 261  *
 262  * FUNCTION:    acpi_ev_address_space_dispatch
 263  *
 264  * PARAMETERS:  region_obj          - Internal region object
 265  *              Function            - Read or Write operation
 266  *              Address             - Where in the space to read or write
 267  *              bit_width           - Field width in bits (8, 16, 32, or 64)
 268  *              Value               - Pointer to in or out value
 269  *
 270  * RETURN:      Status
 271  *
 272  * DESCRIPTION: Dispatch an address space or operation region access to
 273  *              a previously installed handler.
 274  *
 275  ******************************************************************************/
 276
 277 acpi_status
 278 acpi_ev_address_space_dispatch (
 279         union acpi_operand_object       *region_obj,
 280         u32                             function,
 281         acpi_physical_address           address,
 282         u32                             bit_width,
 283         void                            *value)
 284 {
 285         acpi_status                     status;
 286         acpi_status                     status2;
 287         acpi_adr_space_handler          handler;
 288         acpi_adr_space_setup            region_setup;
 289         union acpi_operand_object       *handler_desc;
 290         union acpi_operand_object       *region_obj2;
 291         void                            *region_context = NULL;
 292
 293
 294         ACPI_FUNCTION_TRACE ("ev_address_space_dispatch");
 295
 296
 297         region_obj2 = acpi_ns_get_secondary_object (region_obj);
 298         if (!region_obj2) {
 299                 return_ACPI_STATUS (AE_NOT_EXIST);
 300         }
 301
 302         /* Ensure that there is a handler associated with this region */
 303
 304         handler_desc = region_obj->region.handler;
 305         if (!handler_desc) {
 306                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 307                         "No handler for Region [%4.4s] (%p) [%s]\n",
 308                         acpi_ut_get_node_name (region_obj->region.node),
 309                         region_obj, acpi_ut_get_region_name (region_obj->region.space_id)));
 310
 311                 return_ACPI_STATUS (AE_NOT_EXIST);
 312         }
 313
 314         /*
 315          * It may be the case that the region has never been initialized
 316          * Some types of regions require special init code
 317          */
 318         if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
 319                 /*
 320                  * This region has not been initialized yet, do it
 321                  */
 322                 region_setup = handler_desc->address_space.setup;
 323                 if (!region_setup) {
 324                         /* No initialization routine, exit with error */
 325
 326                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No init routine for region(%p) [%s]\n",
 327                                 region_obj, acpi_ut_get_region_name (region_obj->region.space_id)));
 328                         return_ACPI_STATUS (AE_NOT_EXIST);
 329                 }
 330
 331                 /*
 332                  * We must exit the interpreter because the region setup will potentially
 333                  * execute control methods (e.g., _REG method for this region)
 334                  */
 335                 acpi_ex_exit_interpreter ();
 336
 337                 status = region_setup (region_obj, ACPI_REGION_ACTIVATE,
 338                                   handler_desc->address_space.context, &region_context);
 339
 340                 /* Re-enter the interpreter */
 341
 342                 status2 = acpi_ex_enter_interpreter ();
 343                 if (ACPI_FAILURE (status2)) {
 344                         return_ACPI_STATUS (status2);
 345                 }
 346
 347                 /* Check for failure of the Region Setup */
 348
 349                 if (ACPI_FAILURE (status)) {
 350                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Region Init: %s [%s]\n",
 351                                 acpi_format_exception (status),
 352                                 acpi_ut_get_region_name (region_obj->region.space_id)));
 353                         return_ACPI_STATUS (status);
 354                 }
 355
 356                 /*
 357                  * Region initialization may have been completed by region_setup
 358                  */
 359                 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
 360                         region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
 361
 362                         if (region_obj2->extra.region_context) {
 363                                 /* The handler for this region was already installed */
 364
 365                                 ACPI_MEM_FREE (region_context);
 366                         }
 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 = region_context;
 373                         }
 374                 }
 375         }
 376
 377         /* We have everything we need, we can invoke the address space handler */
 378
 379         handler = handler_desc->address_space.handler;
 380
 381         ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 382                 "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
 383                 &region_obj->region.handler->address_space, handler,
 384                 ACPI_FORMAT_UINT64 (address),
 385                 acpi_ut_get_region_name (region_obj->region.space_id)));
 386
 387         if (!(handler_desc->address_space.hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
 388                 /*
 389                  * For handlers other than the default (supplied) handlers, we must
 390                  * exit the interpreter because the handler *might* block -- we don't
 391                  * know what it will do, so we can't hold the lock on the intepreter.
 392                  */
 393                 acpi_ex_exit_interpreter();
 394         }
 395
 396         /* Call the handler */
 397
 398         status = handler (function, address, bit_width, value,
 399                          handler_desc->address_space.context,
 400                          region_obj2->extra.region_context);
 401
 402         if (ACPI_FAILURE (status)) {
 403                 ACPI_REPORT_ERROR (("Handler for [%s] returned %s\n",
 404                         acpi_ut_get_region_name (region_obj->region.space_id),
 405                         acpi_format_exception (status)));
 406         }
 407
 408         if (!(handler_desc->address_space.hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
 409                 /*
 410                  * We just returned from a non-default handler, we must re-enter the
 411                  * interpreter
 412                  */
 413                 status2 = acpi_ex_enter_interpreter ();
 414                 if (ACPI_FAILURE (status2)) {
 415                         return_ACPI_STATUS (status2);
 416                 }
 417         }
 418
 419         return_ACPI_STATUS (status);
 420 }
 421
 422
 423 /*******************************************************************************
 424  *
 425  * FUNCTION:    acpi_ev_detach_region
 426  *
 427  * PARAMETERS:  region_obj          - Region Object
 428  *              acpi_ns_is_locked   - Namespace Region Already Locked?
 429  *
 430  * RETURN:      None
 431  *
 432  * DESCRIPTION: Break the association between the handler and the region
 433  *              this is a two way association.
 434  *
 435  ******************************************************************************/
 436
 437 void
 438 acpi_ev_detach_region(
 439         union acpi_operand_object       *region_obj,
 440         u8                              acpi_ns_is_locked)
 441 {
 442         union acpi_operand_object       *handler_obj;
 443         union acpi_operand_object       *obj_desc;
 444         union acpi_operand_object       **last_obj_ptr;
 445         acpi_adr_space_setup            region_setup;
 446         void                            **region_context;
 447         union acpi_operand_object       *region_obj2;
 448         acpi_status                     status;
 449
 450
 451         ACPI_FUNCTION_TRACE ("ev_detach_region");
 452
 453
 454         region_obj2 = acpi_ns_get_secondary_object (region_obj);
 455         if (!region_obj2) {
 456                 return_VOID;
 457         }
 458         region_context = &region_obj2->extra.region_context;
 459
 460         /* Get the address handler from the region object */
 461
 462         handler_obj = region_obj->region.handler;
 463         if (!handler_obj) {
 464                 /* This region has no handler, all done */
 465
 466                 return_VOID;
 467         }
 468
 469         /* Find this region in the handler's list */
 470
 471         obj_desc = handler_obj->address_space.region_list;
 472         last_obj_ptr = &handler_obj->address_space.region_list;
 473
 474         while (obj_desc) {
 475                 /* Is this the correct Region? */
 476
 477                 if (obj_desc == region_obj) {
 478                         ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 479                                 "Removing Region %p from address handler %p\n",
 480                                 region_obj, handler_obj));
 481
 482                         /* This is it, remove it from the handler's list */
 483
 484                         *last_obj_ptr = obj_desc->region.next;
 485                         obj_desc->region.next = NULL;           /* Must clear field */
 486
 487                         if (acpi_ns_is_locked) {
 488                                 status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 489                                 if (ACPI_FAILURE (status)) {
 490                                         return_VOID;
 491                                 }
 492                         }
 493
 494                         /* Now stop region accesses by executing the _REG method */
 495
 496                         status = acpi_ev_execute_reg_method (region_obj, 0);
 497                         if (ACPI_FAILURE (status)) {
 498                                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%s from region _REG, [%s]\n",
 499                                         acpi_format_exception (status),
 500                                         acpi_ut_get_region_name (region_obj->region.space_id)));
 501                         }
 502
 503                         if (acpi_ns_is_locked) {
 504                                 status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 505                                 if (ACPI_FAILURE (status)) {
 506                                         return_VOID;
 507                                 }
 508                         }
 509
 510                         /* Call the setup handler with the deactivate notification */
 511
 512                         region_setup = handler_obj->address_space.setup;
 513                         status = region_setup (region_obj, ACPI_REGION_DEACTIVATE,
 514                                           handler_obj->address_space.context, region_context);
 515
 516                         /* Init routine may fail, Just ignore errors */
 517
 518                         if (ACPI_FAILURE (status)) {
 519                                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%s from region init, [%s]\n",
 520                                         acpi_format_exception (status),
 521                                         acpi_ut_get_region_name (region_obj->region.space_id)));
 522                         }
 523
 524                         region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);
 525
 526                         /*
 527                          * Remove handler reference in the region
 528                          *
 529                          * NOTE: this doesn't mean that the region goes away
 530                          * The region is just inaccessible as indicated to
 531                          * the _REG method
 532                          *
 533                          * If the region is on the handler's list
 534                          * this better be the region's handler
 535                          */
 536                         region_obj->region.handler = NULL;
 537                         acpi_ut_remove_reference (handler_obj);
 538
 539                         return_VOID;
 540                 }
 541
 542                 /* Walk the linked list of handlers */
 543
 544                 last_obj_ptr = &obj_desc->region.next;
 545                 obj_desc = obj_desc->region.next;
 546         }
 547
 548         /* If we get here, the region was not in the handler's region list */
 549
 550         ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 551                 "Cannot remove region %p from address handler %p\n",
 552                 region_obj, handler_obj));
 553
 554         return_VOID;
 555 }
 556
 557
 558 /*******************************************************************************
 559  *
 560  * FUNCTION:    acpi_ev_attach_region
 561  *
 562  * PARAMETERS:  handler_obj         - Handler Object
 563  *              region_obj          - Region Object
 564  *              acpi_ns_is_locked   - Namespace Region Already Locked?
 565  *
 566  * RETURN:      None
 567  *
 568  * DESCRIPTION: Create the association between the handler and the region
 569  *              this is a two way association.
 570  *
 571  ******************************************************************************/
 572
 573 acpi_status
 574 acpi_ev_attach_region (
 575         union acpi_operand_object       *handler_obj,
 576         union acpi_operand_object       *region_obj,
 577         u8                              acpi_ns_is_locked)
 578 {
 579
 580         ACPI_FUNCTION_TRACE ("ev_attach_region");
 581
 582
 583         ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 584                 "Adding Region [%4.4s] %p to address handler %p [%s]\n",
 585                 acpi_ut_get_node_name (region_obj->region.node),
 586                 region_obj, handler_obj,
 587                 acpi_ut_get_region_name (region_obj->region.space_id)));
 588
 589         /* Link this region to the front of the handler's list */
 590
 591         region_obj->region.next = handler_obj->address_space.region_list;
 592         handler_obj->address_space.region_list = region_obj;
 593
 594         /* Install the region's handler */
 595
 596         if (region_obj->region.handler) {
 597                 return_ACPI_STATUS (AE_ALREADY_EXISTS);
 598         }
 599
 600         region_obj->region.handler = handler_obj;
 601         acpi_ut_add_reference (handler_obj);
 602
 603         return_ACPI_STATUS (AE_OK);
 604 }
 605
 606
 607 /*******************************************************************************
 608  *
 609  * FUNCTION:    acpi_ev_install_handler
 610  *
 611  * PARAMETERS:  walk_namespace callback
 612  *
 613  * DESCRIPTION: This routine installs an address handler into objects that are
 614  *              of type Region or Device.
 615  *
 616  *              If the Object is a Device, and the device has a handler of
 617  *              the same type then the search is terminated in that branch.
 618  *
 619  *              This is because the existing handler is closer in proximity
 620  *              to any more regions than the one we are trying to install.
 621  *
 622  ******************************************************************************/
 623
 624 acpi_status
 625 acpi_ev_install_handler (
 626         acpi_handle                     obj_handle,
 627         u32                             level,
 628         void                            *context,
 629         void                            **return_value)
 630 {
 631         union acpi_operand_object       *handler_obj;
 632         union acpi_operand_object       *next_handler_obj;
 633         union acpi_operand_object       *obj_desc;
 634         struct acpi_namespace_node      *node;
 635         acpi_status                     status;
 636
 637
 638         ACPI_FUNCTION_NAME ("ev_install_handler");
 639
 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) &&
 662                 (node != acpi_gbl_root_node)) {
 663                 return (AE_OK);
 664         }
 665
 666         /* Check for an existing internal object */
 667
 668         obj_desc = acpi_ns_get_attached_object (node);
 669         if (!obj_desc) {
 670                 /* No object, just exit */
 671
 672                 return (AE_OK);
 673         }
 674
 675         /* Devices are handled different than regions */
 676
 677         if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_DEVICE) {
 678                 /* Check if this Device already has a handler for this address space */
 679
 680                 next_handler_obj = obj_desc->device.handler;
 681                 while (next_handler_obj) {
 682                         /* Found a handler, is it for the same address space? */
 683
 684                         if (next_handler_obj->address_space.space_id == 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 (handler_obj->address_space.space_id),
 688                                         obj_desc, next_handler_obj, handler_obj));
 689
 690                                 /*
 691                                  * Since the object we found it on was a device, then it
 692                                  * means that someone has already installed a handler for
 693                                  * the branch of the namespace from this device on.  Just
 694                                  * bail out telling the walk routine to not traverse this
 695                                  * branch.  This preserves the scoping rule for handlers.
 696                                  */
 697                                 return (AE_CTRL_DEPTH);
 698                         }
 699
 700                         /* Walk the linked list of handlers attached to this device */
 701
 702                         next_handler_obj = next_handler_obj->address_space.next;
 703                 }
 704
 705                 /*
 706                  * As long as the device didn't have a handler for this
 707                  * space we don't care about it.  We just ignore it and
 708                  * proceed.
 709                  */
 710                 return (AE_OK);
 711         }
 712
 713         /* Object is a Region */
 714
 715         if (obj_desc->region.space_id != handler_obj->address_space.space_id) {
 716                 /*
 717                  * This region is for a different address space
 718                  * -- just ignore it
 719                  */
 720                 return (AE_OK);
 721         }
 722
 723         /*
 724          * Now we have a region and it is for the handler's address
 725          * space type.
 726          *
 727          * First disconnect region for any previous handler (if any)
 728          */
 729         acpi_ev_detach_region (obj_desc, FALSE);
 730
 731         /* Connect the region to the new handler */
 732
 733         status = acpi_ev_attach_region (handler_obj, obj_desc, FALSE);
 734         return (status);
 735 }
 736
 737
 738 /*******************************************************************************
 739  *
 740  * FUNCTION:    acpi_ev_install_space_handler
 741  *
 742  * PARAMETERS:  Node            - Namespace node for the device
 743  *              space_id        - The address space ID
 744  *              Handler         - Address of the handler
 745  *              Setup           - Address of the setup function
 746  *              Context         - Value passed to the handler on each access
 747  *
 748  * RETURN:      Status
 749  *
 750  * DESCRIPTION: Install a handler for all op_regions of a given space_id.
 751  *              Assumes namespace is locked
 752  *
 753  ******************************************************************************/
 754
 755 acpi_status
 756 acpi_ev_install_space_handler (
 757         struct acpi_namespace_node      *node,
 758         acpi_adr_space_type             space_id,
 759         acpi_adr_space_handler          handler,
 760         acpi_adr_space_setup            setup,
 761         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
 770         ACPI_FUNCTION_TRACE ("ev_install_space_handler");
 771
 772
 773         /*
 774          * This registration is valid for only the types below
 775          * and the root.  This is where the default handlers
 776          * get placed.
 777          */
 778         if ((node->type != ACPI_TYPE_DEVICE)     &&
 779                 (node->type != ACPI_TYPE_PROCESSOR)  &&
 780                 (node->type != ACPI_TYPE_THERMAL)    &&
 781                 (node != acpi_gbl_root_node)) {
 782                 status = AE_BAD_PARAMETER;
 783                 goto unlock_and_exit;
 784         }
 785
 786         if (handler == ACPI_DEFAULT_HANDLER) {
 787                 flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;
 788
 789                 switch (space_id) {
 790                 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 791                         handler = acpi_ex_system_memory_space_handler;
 792                         setup   = acpi_ev_system_memory_region_setup;
 793                         break;
 794
 795                 case ACPI_ADR_SPACE_SYSTEM_IO:
 796                         handler = acpi_ex_system_io_space_handler;
 797                         setup   = acpi_ev_io_space_region_setup;
 798                         break;
 799
 800                 case ACPI_ADR_SPACE_PCI_CONFIG:
 801                         handler = acpi_ex_pci_config_space_handler;
 802                         setup   = acpi_ev_pci_config_region_setup;
 803                         break;
 804
 805                 case ACPI_ADR_SPACE_CMOS:
 806                         handler = acpi_ex_cmos_space_handler;
 807                         setup   = acpi_ev_cmos_region_setup;
 808                         break;
 809
 810                 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
 811                         handler = acpi_ex_pci_bar_space_handler;
 812                         setup   = acpi_ev_pci_bar_region_setup;
 813                         break;
 814
 815                 case ACPI_ADR_SPACE_DATA_TABLE:
 816                         handler = acpi_ex_data_table_space_handler;
 817                         setup   = NULL;
 818                         break;
 819
 820                 default:
 821                         status = AE_BAD_PARAMETER;
 822                         goto unlock_and_exit;
 823                 }
 824         }
 825
 826         /* If the caller hasn't specified a setup routine, use the default */
 827
 828         if (!setup) {
 829                 setup = acpi_ev_default_region_setup;
 830         }
 831
 832         /* Check for an existing internal object */
 833
 834         obj_desc = acpi_ns_get_attached_object (node);
 835         if (obj_desc) {
 836                 /*
 837                  * The attached device object already exists.
 838                  * Make sure the handler is not already installed.
 839                  */
 840                 handler_obj = obj_desc->device.handler;
 841
 842                 /* Walk the handler list for this device */
 843
 844                 while (handler_obj) {
 845                         /* Same space_id indicates a handler already installed */
 846
 847                         if (handler_obj->address_space.space_id == space_id) {
 848                                 if (handler_obj->address_space.handler == handler) {
 849                                         /*
 850                                          * It is (relatively) OK to attempt to install the SAME
 851                                          * handler twice. This can easily happen with PCI_Config space.
 852                                          */
 853                                         status = AE_SAME_HANDLER;
 854                                         goto unlock_and_exit;
 855                                 }
 856                                 else {
 857                                         /* A handler is already installed */
 858
 859                                         status = AE_ALREADY_EXISTS;
 860                                 }
 861                                 goto unlock_and_exit;
 862                         }
 863
 864                         /* Walk the linked list of handlers */
 865
 866                         handler_obj = handler_obj->address_space.next;
 867                 }
 868         }
 869         else {
 870                 ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 871                         "Creating object on Device %p while installing handler\n", node));
 872
 873                 /* obj_desc does not exist, create one */
 874
 875                 if (node->type == ACPI_TYPE_ANY) {
 876                         type = ACPI_TYPE_DEVICE;
 877                 }
 878                 else {
 879                         type = node->type;
 880                 }
 881
 882                 obj_desc = acpi_ut_create_internal_object (type);
 883                 if (!obj_desc) {
 884                         status = AE_NO_MEMORY;
 885                         goto unlock_and_exit;
 886                 }
 887
 888                 /* Init new descriptor */
 889
 890                 obj_desc->common.type = (u8) type;
 891
 892                 /* Attach the new object to the Node */
 893
 894                 status = acpi_ns_attach_object (node, obj_desc, type);
 895
 896                 /* Remove local reference to the object */
 897
 898                 acpi_ut_remove_reference (obj_desc);
 899
 900                 if (ACPI_FAILURE (status)) {
 901                         goto unlock_and_exit;
 902                 }
 903         }
 904
 905         ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 906                 "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
 907                 acpi_ut_get_region_name (space_id), space_id,
 908                 acpi_ut_get_node_name (node), node, obj_desc));
 909
 910         /*
 911          * Install the handler
 912          *
 913          * At this point there is no existing handler.
 914          * Just allocate the object for the handler and link it
 915          * into the list.
 916          */
 917         handler_obj = acpi_ut_create_internal_object (ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
 918         if (!handler_obj) {
 919                 status = AE_NO_MEMORY;
 920                 goto unlock_and_exit;
 921         }
 922
 923         /* Init handler obj */
 924
 925         handler_obj->address_space.space_id  = (u8) space_id;
 926         handler_obj->address_space.hflags    = flags;
 927         handler_obj->address_space.region_list = NULL;
 928         handler_obj->address_space.node      = node;
 929         handler_obj->address_space.handler   = handler;
 930         handler_obj->address_space.context   = context;
 931         handler_obj->address_space.setup     = setup;
 932
 933         /* Install at head of Device.address_space list */
 934
 935         handler_obj->address_space.next      = obj_desc->device.handler;
 936
 937         /*
 938          * The Device object is the first reference on the handler_obj.
 939          * Each region that uses the handler adds a reference.
 940          */
 941         obj_desc->device.handler = handler_obj;
 942
 943         /*
 944          * Walk the namespace finding all of the regions this
 945          * handler will manage.
 946          *
 947          * Start at the device and search the branch toward
 948          * the leaf nodes until either the leaf is encountered or
 949          * a device is detected that has an address handler of the
 950          * same type.
 951          *
 952          * In either case, back up and search down the remainder
 953          * of the branch
 954          */
 955         status = acpi_ns_walk_namespace (ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
 956                           ACPI_NS_WALK_UNLOCK, acpi_ev_install_handler,
 957                           handler_obj, NULL);
 958
 959 unlock_and_exit:
 960         return_ACPI_STATUS (status);
 961 }
 962
 963
 964 /*******************************************************************************
 965  *
 966  * FUNCTION:    acpi_ev_execute_reg_methods
 967  *
 968  * PARAMETERS:  Node            - Namespace node for the device
 969  *              space_id        - The address space ID
 970  *
 971  * RETURN:      Status
 972  *
 973  * DESCRIPTION: Run all _REG methods for the input Space ID;
 974  *              Note: assumes namespace is locked, or system init time.
 975  *
 976  ******************************************************************************/
 977
 978 acpi_status
 979 acpi_ev_execute_reg_methods (
 980         struct acpi_namespace_node      *node,
 981         acpi_adr_space_type             space_id)
 982 {
 983         acpi_status                     status;
 984
 985
 986         ACPI_FUNCTION_TRACE ("ev_execute_reg_methods");
 987
 988
 989         /*
 990          * Run all _REG methods for all Operation Regions for this
 991          * space ID.  This is a separate walk in order to handle any
 992          * interdependencies between regions and _REG methods.  (i.e. handlers
 993          * must be installed for all regions of this Space ID before we
 994          * can run any _REG methods)
 995          */
 996         status = acpi_ns_walk_namespace (ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
 997                           ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
 998                           &space_id, NULL);
 999
1000         return_ACPI_STATUS (status);
1001 }
1002
1003
1004 /*******************************************************************************
1005  *
1006  * FUNCTION:    acpi_ev_reg_run
1007  *
1008  * PARAMETERS:  walk_namespace callback
1009  *
1010  * DESCRIPTION: Run _REg method for region objects of the requested space_iD
1011  *
1012  ******************************************************************************/
1013
1014 acpi_status
1015 acpi_ev_reg_run (
1016         acpi_handle                     obj_handle,
1017         u32                             level,
1018         void                            *context,
1019         void                            **return_value)
1020 {
1021         union acpi_operand_object       *obj_desc;
1022         struct acpi_namespace_node      *node;
1023         acpi_adr_space_type             space_id;
1024         acpi_status                     status;
1025
1026
1027         space_id = *ACPI_CAST_PTR (acpi_adr_space_type, context);
1028
1029         /* Convert and validate the device handle */
1030
1031         node = acpi_ns_map_handle_to_node (obj_handle);
1032         if (!node) {
1033                 return (AE_BAD_PARAMETER);
1034         }
1035
1036         /*
1037          * We only care about regions.and objects
1038          * that are allowed to have address space handlers
1039          */
1040         if ((node->type != ACPI_TYPE_REGION) &&
1041                 (node != acpi_gbl_root_node)) {
1042                 return (AE_OK);
1043         }
1044
1045         /* Check for an existing internal object */
1046
1047         obj_desc = acpi_ns_get_attached_object (node);
1048         if (!obj_desc) {
1049                 /* No object, just exit */
1050
1051                 return (AE_OK);
1052         }
1053
1054         /* Object is a Region */
1055
1056         if (obj_desc->region.space_id != space_id) {
1057                 /*
1058                  * This region is for a different address space
1059                  * -- just ignore it
1060                  */
1061                 return (AE_OK);
1062         }
1063
1064         status = acpi_ev_execute_reg_method (obj_desc, 1);
1065         return (status);
1066 }
1067