drivers/acpi/events/evrgnini.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evrgnini- ACPI address_space (op_region) init
   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
  48 #define _COMPONENT          ACPI_EVENTS
  49 ACPI_MODULE_NAME("evrgnini")
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    acpi_ev_system_memory_region_setup
  54  *
  55  * PARAMETERS:  Handle              - Region we are interested in
  56  *              Function            - Start or stop
  57  *              handler_context     - Address space handler context
  58  *              region_context      - Region specific context
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: Setup a system_memory operation region
  63  *
  64  ******************************************************************************/
  65 acpi_status
  66 acpi_ev_system_memory_region_setup(acpi_handle handle,
  67                                    u32 function,
  68                                    void *handler_context, void **region_context)
  69 {
  70         union acpi_operand_object *region_desc =
  71             (union acpi_operand_object *)handle;
  72         struct acpi_mem_space_context *local_region_context;
  73
  74         ACPI_FUNCTION_TRACE("ev_system_memory_region_setup");
  75
  76         if (function == ACPI_REGION_DEACTIVATE) {
  77                 if (*region_context) {
  78                         ACPI_MEM_FREE(*region_context);
  79                         *region_context = NULL;
  80                 }
  81                 return_ACPI_STATUS(AE_OK);
  82         }
  83
  84         /* Create a new context */
  85
  86         local_region_context =
  87             ACPI_MEM_CALLOCATE(sizeof(struct acpi_mem_space_context));
  88         if (!(local_region_context)) {
  89                 return_ACPI_STATUS(AE_NO_MEMORY);
  90         }
  91
  92         /* Save the region length and address for use in the handler */
  93
  94         local_region_context->length = region_desc->region.length;
  95         local_region_context->address = region_desc->region.address;
  96
  97         *region_context = local_region_context;
  98         return_ACPI_STATUS(AE_OK);
  99 }
 100
 101 /*******************************************************************************
 102  *
 103  * FUNCTION:    acpi_ev_io_space_region_setup
 104  *
 105  * PARAMETERS:  Handle              - Region we are interested in
 106  *              Function            - Start or stop
 107  *              handler_context     - Address space handler context
 108  *              region_context      - Region specific context
 109  *
 110  * RETURN:      Status
 111  *
 112  * DESCRIPTION: Setup a IO operation region
 113  *
 114  ******************************************************************************/
 115
 116 acpi_status
 117 acpi_ev_io_space_region_setup(acpi_handle handle,
 118                               u32 function,
 119                               void *handler_context, void **region_context)
 120 {
 121         ACPI_FUNCTION_TRACE("ev_io_space_region_setup");
 122
 123         if (function == ACPI_REGION_DEACTIVATE) {
 124                 *region_context = NULL;
 125         } else {
 126                 *region_context = handler_context;
 127         }
 128
 129         return_ACPI_STATUS(AE_OK);
 130 }
 131
 132 /*******************************************************************************
 133  *
 134  * FUNCTION:    acpi_ev_pci_config_region_setup
 135  *
 136  * PARAMETERS:  Handle              - Region we are interested in
 137  *              Function            - Start or stop
 138  *              handler_context     - Address space handler context
 139  *              region_context      - Region specific context
 140  *
 141  * RETURN:      Status
 142  *
 143  * DESCRIPTION: Setup a PCI_Config operation region
 144  *
 145  * MUTEX:       Assumes namespace is not locked
 146  *
 147  ******************************************************************************/
 148
 149 acpi_status
 150 acpi_ev_pci_config_region_setup(acpi_handle handle,
 151                                 u32 function,
 152                                 void *handler_context, void **region_context)
 153 {
 154         acpi_status status = AE_OK;
 155         acpi_integer pci_value;
 156         struct acpi_pci_id *pci_id = *region_context;
 157         union acpi_operand_object *handler_obj;
 158         struct acpi_namespace_node *parent_node;
 159         struct acpi_namespace_node *pci_root_node;
 160         union acpi_operand_object *region_obj =
 161             (union acpi_operand_object *)handle;
 162         struct acpi_device_id object_hID;
 163
 164         ACPI_FUNCTION_TRACE("ev_pci_config_region_setup");
 165
 166         handler_obj = region_obj->region.handler;
 167         if (!handler_obj) {
 168                 /*
 169                  * No installed handler. This shouldn't happen because the dispatch
 170                  * routine checks before we get here, but we check again just in case.
 171                  */
 172                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 173                                   "Attempting to init a region %p, with no handler\n",
 174                                   region_obj));
 175                 return_ACPI_STATUS(AE_NOT_EXIST);
 176         }
 177
 178         *region_context = NULL;
 179         if (function == ACPI_REGION_DEACTIVATE) {
 180                 if (pci_id) {
 181                         ACPI_MEM_FREE(pci_id);
 182                 }
 183                 return_ACPI_STATUS(status);
 184         }
 185
 186         parent_node = acpi_ns_get_parent_node(region_obj->region.node);
 187
 188         /*
 189          * Get the _SEG and _BBN values from the device upon which the handler
 190          * is installed.
 191          *
 192          * We need to get the _SEG and _BBN objects relative to the PCI BUS device.
 193          * This is the device the handler has been registered to handle.
 194          */
 195
 196         /*
 197          * If the address_space.Node is still pointing to the root, we need
 198          * to scan upward for a PCI Root bridge and re-associate the op_region
 199          * handlers with that device.
 200          */
 201         if (handler_obj->address_space.node == acpi_gbl_root_node) {
 202                 /* Start search from the parent object */
 203
 204                 pci_root_node = parent_node;
 205                 while (pci_root_node != acpi_gbl_root_node) {
 206                         status =
 207                             acpi_ut_execute_HID(pci_root_node, &object_hID);
 208                         if (ACPI_SUCCESS(status)) {
 209                                 /*
 210                                  * Got a valid _HID string, check if this is a PCI root.
 211                                  * New for ACPI 3.0: check for a PCI Express root also.
 212                                  */
 213                                 if (!
 214                                     (ACPI_STRNCMP
 215                                      (object_hID.value, PCI_ROOT_HID_STRING,
 216                                       sizeof(PCI_ROOT_HID_STRING))
 217                                      ||
 218                                      !(ACPI_STRNCMP
 219                                        (object_hID.value,
 220                                         PCI_EXPRESS_ROOT_HID_STRING,
 221                                         sizeof(PCI_EXPRESS_ROOT_HID_STRING)))))
 222                                 {
 223                                         /* Install a handler for this PCI root bridge */
 224
 225                                         status =
 226                                             acpi_install_address_space_handler((acpi_handle) pci_root_node, ACPI_ADR_SPACE_PCI_CONFIG, ACPI_DEFAULT_HANDLER, NULL, NULL);
 227                                         if (ACPI_FAILURE(status)) {
 228                                                 if (status == AE_SAME_HANDLER) {
 229                                                         /*
 230                                                          * It is OK if the handler is already installed on the root
 231                                                          * bridge.  Still need to return a context object for the
 232                                                          * new PCI_Config operation region, however.
 233                                                          */
 234                                                         status = AE_OK;
 235                                                 } else {
 236                                                         ACPI_REPORT_ERROR(("Could not install pci_config handler for Root Bridge %4.4s, %s\n", acpi_ut_get_node_name(pci_root_node), acpi_format_exception(status)));
 237                                                 }
 238                                         }
 239                                         break;
 240                                 }
 241                         }
 242
 243                         pci_root_node = acpi_ns_get_parent_node(pci_root_node);
 244                 }
 245
 246                 /* PCI root bridge not found, use namespace root node */
 247         } else {
 248                 pci_root_node = handler_obj->address_space.node;
 249         }
 250
 251         /*
 252          * If this region is now initialized, we are done.
 253          * (install_address_space_handler could have initialized it)
 254          */
 255         if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
 256                 return_ACPI_STATUS(AE_OK);
 257         }
 258
 259         /* Region is still not initialized. Create a new context */
 260
 261         pci_id = ACPI_MEM_CALLOCATE(sizeof(struct acpi_pci_id));
 262         if (!pci_id) {
 263                 return_ACPI_STATUS(AE_NO_MEMORY);
 264         }
 265
 266         /*
 267          * For PCI_Config space access, we need the segment, bus,
 268          * device and function numbers.  Acquire them here.
 269          */
 270
 271         /*
 272          * Get the PCI device and function numbers from the _ADR object
 273          * contained in the parent's scope.
 274          */
 275         status =
 276             acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, parent_node,
 277                                             &pci_value);
 278
 279         /*
 280          * The default is zero, and since the allocation above zeroed
 281          * the data, just do nothing on failure.
 282          */
 283         if (ACPI_SUCCESS(status)) {
 284                 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(pci_value));
 285                 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(pci_value));
 286         }
 287
 288         /* The PCI segment number comes from the _SEG method */
 289
 290         status =
 291             acpi_ut_evaluate_numeric_object(METHOD_NAME__SEG, pci_root_node,
 292                                             &pci_value);
 293         if (ACPI_SUCCESS(status)) {
 294                 pci_id->segment = ACPI_LOWORD(pci_value);
 295         }
 296
 297         /* The PCI bus number comes from the _BBN method */
 298
 299         status =
 300             acpi_ut_evaluate_numeric_object(METHOD_NAME__BBN, pci_root_node,
 301                                             &pci_value);
 302         if (ACPI_SUCCESS(status)) {
 303                 pci_id->bus = ACPI_LOWORD(pci_value);
 304         }
 305
 306         /* Complete this device's pci_id */
 307
 308         acpi_os_derive_pci_id(pci_root_node, region_obj->region.node, &pci_id);
 309
 310         *region_context = pci_id;
 311         return_ACPI_STATUS(AE_OK);
 312 }
 313
 314 /*******************************************************************************
 315  *
 316  * FUNCTION:    acpi_ev_pci_bar_region_setup
 317  *
 318  * PARAMETERS:  Handle              - Region we are interested in
 319  *              Function            - Start or stop
 320  *              handler_context     - Address space handler context
 321  *              region_context      - Region specific context
 322  *
 323  * RETURN:      Status
 324  *
 325  * DESCRIPTION: Setup a pci_bAR operation region
 326  *
 327  * MUTEX:       Assumes namespace is not locked
 328  *
 329  ******************************************************************************/
 330
 331 acpi_status
 332 acpi_ev_pci_bar_region_setup(acpi_handle handle,
 333                              u32 function,
 334                              void *handler_context, void **region_context)
 335 {
 336         ACPI_FUNCTION_TRACE("ev_pci_bar_region_setup");
 337
 338         return_ACPI_STATUS(AE_OK);
 339 }
 340
 341 /*******************************************************************************
 342  *
 343  * FUNCTION:    acpi_ev_cmos_region_setup
 344  *
 345  * PARAMETERS:  Handle              - Region we are interested in
 346  *              Function            - Start or stop
 347  *              handler_context     - Address space handler context
 348  *              region_context      - Region specific context
 349  *
 350  * RETURN:      Status
 351  *
 352  * DESCRIPTION: Setup a CMOS operation region
 353  *
 354  * MUTEX:       Assumes namespace is not locked
 355  *
 356  ******************************************************************************/
 357
 358 acpi_status
 359 acpi_ev_cmos_region_setup(acpi_handle handle,
 360                           u32 function,
 361                           void *handler_context, void **region_context)
 362 {
 363         ACPI_FUNCTION_TRACE("ev_cmos_region_setup");
 364
 365         return_ACPI_STATUS(AE_OK);
 366 }
 367
 368 /*******************************************************************************
 369  *
 370  * FUNCTION:    acpi_ev_default_region_setup
 371  *
 372  * PARAMETERS:  Handle              - Region we are interested in
 373  *              Function            - Start or stop
 374  *              handler_context     - Address space handler context
 375  *              region_context      - Region specific context
 376  *
 377  * RETURN:      Status
 378  *
 379  * DESCRIPTION: Default region initialization
 380  *
 381  ******************************************************************************/
 382
 383 acpi_status
 384 acpi_ev_default_region_setup(acpi_handle handle,
 385                              u32 function,
 386                              void *handler_context, void **region_context)
 387 {
 388         ACPI_FUNCTION_TRACE("ev_default_region_setup");
 389
 390         if (function == ACPI_REGION_DEACTIVATE) {
 391                 *region_context = NULL;
 392         } else {
 393                 *region_context = handler_context;
 394         }
 395
 396         return_ACPI_STATUS(AE_OK);
 397 }
 398
 399 /*******************************************************************************
 400  *
 401  * FUNCTION:    acpi_ev_initialize_region
 402  *
 403  * PARAMETERS:  region_obj      - Region we are initializing
 404  *              acpi_ns_locked  - Is namespace locked?
 405  *
 406  * RETURN:      Status
 407  *
 408  * DESCRIPTION: Initializes the region, finds any _REG methods and saves them
 409  *              for execution at a later time
 410  *
 411  *              Get the appropriate address space handler for a newly
 412  *              created region.
 413  *
 414  *              This also performs address space specific initialization.  For
 415  *              example, PCI regions must have an _ADR object that contains
 416  *              a PCI address in the scope of the definition.  This address is
 417  *              required to perform an access to PCI config space.
 418  *
 419  ******************************************************************************/
 420
 421 acpi_status
 422 acpi_ev_initialize_region(union acpi_operand_object *region_obj,
 423                           u8 acpi_ns_locked)
 424 {
 425         union acpi_operand_object *handler_obj;
 426         union acpi_operand_object *obj_desc;
 427         acpi_adr_space_type space_id;
 428         struct acpi_namespace_node *node;
 429         acpi_status status;
 430         struct acpi_namespace_node *method_node;
 431         acpi_name *reg_name_ptr = (acpi_name *) METHOD_NAME__REG;
 432         union acpi_operand_object *region_obj2;
 433
 434         ACPI_FUNCTION_TRACE_U32("ev_initialize_region", acpi_ns_locked);
 435
 436         if (!region_obj) {
 437                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 438         }
 439
 440         if (region_obj->common.flags & AOPOBJ_OBJECT_INITIALIZED) {
 441                 return_ACPI_STATUS(AE_OK);
 442         }
 443
 444         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 445         if (!region_obj2) {
 446                 return_ACPI_STATUS(AE_NOT_EXIST);
 447         }
 448
 449         node = acpi_ns_get_parent_node(region_obj->region.node);
 450         space_id = region_obj->region.space_id;
 451
 452         /* Setup defaults */
 453
 454         region_obj->region.handler = NULL;
 455         region_obj2->extra.method_REG = NULL;
 456         region_obj->common.flags &= ~(AOPOBJ_SETUP_COMPLETE);
 457         region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED;
 458
 459         /* Find any "_REG" method associated with this region definition */
 460
 461         status = acpi_ns_search_node(*reg_name_ptr, node,
 462                                      ACPI_TYPE_METHOD, &method_node);
 463         if (ACPI_SUCCESS(status)) {
 464                 /*
 465                  * The _REG method is optional and there can be only one per region
 466                  * definition.  This will be executed when the handler is attached
 467                  * or removed
 468                  */
 469                 region_obj2->extra.method_REG = method_node;
 470         }
 471
 472         /*
 473          * The following loop depends upon the root Node having no parent
 474          * ie: acpi_gbl_root_node->parent_entry being set to NULL
 475          */
 476         while (node) {
 477                 /* Check to see if a handler exists */
 478
 479                 handler_obj = NULL;
 480                 obj_desc = acpi_ns_get_attached_object(node);
 481                 if (obj_desc) {
 482                         /* Can only be a handler if the object exists */
 483
 484                         switch (node->type) {
 485                         case ACPI_TYPE_DEVICE:
 486
 487                                 handler_obj = obj_desc->device.handler;
 488                                 break;
 489
 490                         case ACPI_TYPE_PROCESSOR:
 491
 492                                 handler_obj = obj_desc->processor.handler;
 493                                 break;
 494
 495                         case ACPI_TYPE_THERMAL:
 496
 497                                 handler_obj = obj_desc->thermal_zone.handler;
 498                                 break;
 499
 500                         default:
 501                                 /* Ignore other objects */
 502                                 break;
 503                         }
 504
 505                         while (handler_obj) {
 506                                 /* Is this handler of the correct type? */
 507
 508                                 if (handler_obj->address_space.space_id ==
 509                                     space_id) {
 510                                         /* Found correct handler */
 511
 512                                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 513                                                           "Found handler %p for region %p in obj %p\n",
 514                                                           handler_obj,
 515                                                           region_obj,
 516                                                           obj_desc));
 517
 518                                         status =
 519                                             acpi_ev_attach_region(handler_obj,
 520                                                                   region_obj,
 521                                                                   acpi_ns_locked);
 522
 523                                         /*
 524                                          * Tell all users that this region is usable by running the _REG
 525                                          * method
 526                                          */
 527                                         if (acpi_ns_locked) {
 528                                                 status =
 529                                                     acpi_ut_release_mutex
 530                                                     (ACPI_MTX_NAMESPACE);
 531                                                 if (ACPI_FAILURE(status)) {
 532                                                         return_ACPI_STATUS
 533                                                             (status);
 534                                                 }
 535                                         }
 536
 537                                         status =
 538                                             acpi_ev_execute_reg_method
 539                                             (region_obj, 1);
 540
 541                                         if (acpi_ns_locked) {
 542                                                 status =
 543                                                     acpi_ut_acquire_mutex
 544                                                     (ACPI_MTX_NAMESPACE);
 545                                                 if (ACPI_FAILURE(status)) {
 546                                                         return_ACPI_STATUS
 547                                                             (status);
 548                                                 }
 549                                         }
 550
 551                                         return_ACPI_STATUS(AE_OK);
 552                                 }
 553
 554                                 /* Try next handler in the list */
 555
 556                                 handler_obj = handler_obj->address_space.next;
 557                         }
 558                 }
 559
 560                 /*
 561                  * This node does not have the handler we need;
 562                  * Pop up one level
 563                  */
 564                 node = acpi_ns_get_parent_node(node);
 565         }
 566
 567         /* If we get here, there is no handler for this region */
 568
 569         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 570                           "No handler for region_type %s(%X) (region_obj %p)\n",
 571                           acpi_ut_get_region_name(space_id), space_id,
 572                           region_obj));
 573
 574         return_ACPI_STATUS(AE_NOT_EXIST);
 575 }