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_EXCEPTION((AE_INFO,
 237                                                                         status,
 238                                                                         "Could not install pci_config handler for Root Bridge %4.4s",
 239                                                                         acpi_ut_get_node_name
 240                                                                         (pci_root_node)));
 241                                                 }
 242                                         }
 243                                         break;
 244                                 }
 245                         }
 246
 247                         pci_root_node = acpi_ns_get_parent_node(pci_root_node);
 248                 }
 249
 250                 /* PCI root bridge not found, use namespace root node */
 251         } else {
 252                 pci_root_node = handler_obj->address_space.node;
 253         }
 254
 255         /*
 256          * If this region is now initialized, we are done.
 257          * (install_address_space_handler could have initialized it)
 258          */
 259         if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
 260                 return_ACPI_STATUS(AE_OK);
 261         }
 262
 263         /* Region is still not initialized. Create a new context */
 264
 265         pci_id = ACPI_MEM_CALLOCATE(sizeof(struct acpi_pci_id));
 266         if (!pci_id) {
 267                 return_ACPI_STATUS(AE_NO_MEMORY);
 268         }
 269
 270         /*
 271          * For PCI_Config space access, we need the segment, bus,
 272          * device and function numbers.  Acquire them here.
 273          */
 274
 275         /*
 276          * Get the PCI device and function numbers from the _ADR object
 277          * contained in the parent's scope.
 278          */
 279         status =
 280             acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, parent_node,
 281                                             &pci_value);
 282
 283         /*
 284          * The default is zero, and since the allocation above zeroed
 285          * the data, just do nothing on failure.
 286          */
 287         if (ACPI_SUCCESS(status)) {
 288                 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(pci_value));
 289                 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(pci_value));
 290         }
 291
 292         /* The PCI segment number comes from the _SEG method */
 293
 294         status =
 295             acpi_ut_evaluate_numeric_object(METHOD_NAME__SEG, pci_root_node,
 296                                             &pci_value);
 297         if (ACPI_SUCCESS(status)) {
 298                 pci_id->segment = ACPI_LOWORD(pci_value);
 299         }
 300
 301         /* The PCI bus number comes from the _BBN method */
 302
 303         status =
 304             acpi_ut_evaluate_numeric_object(METHOD_NAME__BBN, pci_root_node,
 305                                             &pci_value);
 306         if (ACPI_SUCCESS(status)) {
 307                 pci_id->bus = ACPI_LOWORD(pci_value);
 308         }
 309
 310         /* Complete this device's pci_id */
 311
 312         acpi_os_derive_pci_id(pci_root_node, region_obj->region.node, &pci_id);
 313
 314         *region_context = pci_id;
 315         return_ACPI_STATUS(AE_OK);
 316 }
 317
 318 /*******************************************************************************
 319  *
 320  * FUNCTION:    acpi_ev_pci_bar_region_setup
 321  *
 322  * PARAMETERS:  Handle              - Region we are interested in
 323  *              Function            - Start or stop
 324  *              handler_context     - Address space handler context
 325  *              region_context      - Region specific context
 326  *
 327  * RETURN:      Status
 328  *
 329  * DESCRIPTION: Setup a pci_bAR operation region
 330  *
 331  * MUTEX:       Assumes namespace is not locked
 332  *
 333  ******************************************************************************/
 334
 335 acpi_status
 336 acpi_ev_pci_bar_region_setup(acpi_handle handle,
 337                              u32 function,
 338                              void *handler_context, void **region_context)
 339 {
 340         ACPI_FUNCTION_TRACE("ev_pci_bar_region_setup");
 341
 342         return_ACPI_STATUS(AE_OK);
 343 }
 344
 345 /*******************************************************************************
 346  *
 347  * FUNCTION:    acpi_ev_cmos_region_setup
 348  *
 349  * PARAMETERS:  Handle              - Region we are interested in
 350  *              Function            - Start or stop
 351  *              handler_context     - Address space handler context
 352  *              region_context      - Region specific context
 353  *
 354  * RETURN:      Status
 355  *
 356  * DESCRIPTION: Setup a CMOS operation region
 357  *
 358  * MUTEX:       Assumes namespace is not locked
 359  *
 360  ******************************************************************************/
 361
 362 acpi_status
 363 acpi_ev_cmos_region_setup(acpi_handle handle,
 364                           u32 function,
 365                           void *handler_context, void **region_context)
 366 {
 367         ACPI_FUNCTION_TRACE("ev_cmos_region_setup");
 368
 369         return_ACPI_STATUS(AE_OK);
 370 }
 371
 372 /*******************************************************************************
 373  *
 374  * FUNCTION:    acpi_ev_default_region_setup
 375  *
 376  * PARAMETERS:  Handle              - Region we are interested in
 377  *              Function            - Start or stop
 378  *              handler_context     - Address space handler context
 379  *              region_context      - Region specific context
 380  *
 381  * RETURN:      Status
 382  *
 383  * DESCRIPTION: Default region initialization
 384  *
 385  ******************************************************************************/
 386
 387 acpi_status
 388 acpi_ev_default_region_setup(acpi_handle handle,
 389                              u32 function,
 390                              void *handler_context, void **region_context)
 391 {
 392         ACPI_FUNCTION_TRACE("ev_default_region_setup");
 393
 394         if (function == ACPI_REGION_DEACTIVATE) {
 395                 *region_context = NULL;
 396         } else {
 397                 *region_context = handler_context;
 398         }
 399
 400         return_ACPI_STATUS(AE_OK);
 401 }
 402
 403 /*******************************************************************************
 404  *
 405  * FUNCTION:    acpi_ev_initialize_region
 406  *
 407  * PARAMETERS:  region_obj      - Region we are initializing
 408  *              acpi_ns_locked  - Is namespace locked?
 409  *
 410  * RETURN:      Status
 411  *
 412  * DESCRIPTION: Initializes the region, finds any _REG methods and saves them
 413  *              for execution at a later time
 414  *
 415  *              Get the appropriate address space handler for a newly
 416  *              created region.
 417  *
 418  *              This also performs address space specific initialization.  For
 419  *              example, PCI regions must have an _ADR object that contains
 420  *              a PCI address in the scope of the definition.  This address is
 421  *              required to perform an access to PCI config space.
 422  *
 423  ******************************************************************************/
 424
 425 acpi_status
 426 acpi_ev_initialize_region(union acpi_operand_object *region_obj,
 427                           u8 acpi_ns_locked)
 428 {
 429         union acpi_operand_object *handler_obj;
 430         union acpi_operand_object *obj_desc;
 431         acpi_adr_space_type space_id;
 432         struct acpi_namespace_node *node;
 433         acpi_status status;
 434         struct acpi_namespace_node *method_node;
 435         acpi_name *reg_name_ptr = (acpi_name *) METHOD_NAME__REG;
 436         union acpi_operand_object *region_obj2;
 437
 438         ACPI_FUNCTION_TRACE_U32("ev_initialize_region", acpi_ns_locked);
 439
 440         if (!region_obj) {
 441                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 442         }
 443
 444         if (region_obj->common.flags & AOPOBJ_OBJECT_INITIALIZED) {
 445                 return_ACPI_STATUS(AE_OK);
 446         }
 447
 448         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 449         if (!region_obj2) {
 450                 return_ACPI_STATUS(AE_NOT_EXIST);
 451         }
 452
 453         node = acpi_ns_get_parent_node(region_obj->region.node);
 454         space_id = region_obj->region.space_id;
 455
 456         /* Setup defaults */
 457
 458         region_obj->region.handler = NULL;
 459         region_obj2->extra.method_REG = NULL;
 460         region_obj->common.flags &= ~(AOPOBJ_SETUP_COMPLETE);
 461         region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED;
 462
 463         /* Find any "_REG" method associated with this region definition */
 464
 465         status = acpi_ns_search_node(*reg_name_ptr, node,
 466                                      ACPI_TYPE_METHOD, &method_node);
 467         if (ACPI_SUCCESS(status)) {
 468                 /*
 469                  * The _REG method is optional and there can be only one per region
 470                  * definition.  This will be executed when the handler is attached
 471                  * or removed
 472                  */
 473                 region_obj2->extra.method_REG = method_node;
 474         }
 475
 476         /*
 477          * The following loop depends upon the root Node having no parent
 478          * ie: acpi_gbl_root_node->parent_entry being set to NULL
 479          */
 480         while (node) {
 481                 /* Check to see if a handler exists */
 482
 483                 handler_obj = NULL;
 484                 obj_desc = acpi_ns_get_attached_object(node);
 485                 if (obj_desc) {
 486                         /* Can only be a handler if the object exists */
 487
 488                         switch (node->type) {
 489                         case ACPI_TYPE_DEVICE:
 490
 491                                 handler_obj = obj_desc->device.handler;
 492                                 break;
 493
 494                         case ACPI_TYPE_PROCESSOR:
 495
 496                                 handler_obj = obj_desc->processor.handler;
 497                                 break;
 498
 499                         case ACPI_TYPE_THERMAL:
 500
 501                                 handler_obj = obj_desc->thermal_zone.handler;
 502                                 break;
 503
 504                         default:
 505                                 /* Ignore other objects */
 506                                 break;
 507                         }
 508
 509                         while (handler_obj) {
 510                                 /* Is this handler of the correct type? */
 511
 512                                 if (handler_obj->address_space.space_id ==
 513                                     space_id) {
 514                                         /* Found correct handler */
 515
 516                                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 517                                                           "Found handler %p for region %p in obj %p\n",
 518                                                           handler_obj,
 519                                                           region_obj,
 520                                                           obj_desc));
 521
 522                                         status =
 523                                             acpi_ev_attach_region(handler_obj,
 524                                                                   region_obj,
 525                                                                   acpi_ns_locked);
 526
 527                                         /*
 528                                          * Tell all users that this region is usable by running the _REG
 529                                          * method
 530                                          */
 531                                         if (acpi_ns_locked) {
 532                                                 status =
 533                                                     acpi_ut_release_mutex
 534                                                     (ACPI_MTX_NAMESPACE);
 535                                                 if (ACPI_FAILURE(status)) {
 536                                                         return_ACPI_STATUS
 537                                                             (status);
 538                                                 }
 539                                         }
 540
 541                                         status =
 542                                             acpi_ev_execute_reg_method
 543                                             (region_obj, 1);
 544
 545                                         if (acpi_ns_locked) {
 546                                                 status =
 547                                                     acpi_ut_acquire_mutex
 548                                                     (ACPI_MTX_NAMESPACE);
 549                                                 if (ACPI_FAILURE(status)) {
 550                                                         return_ACPI_STATUS
 551                                                             (status);
 552                                                 }
 553                                         }
 554
 555                                         return_ACPI_STATUS(AE_OK);
 556                                 }
 557
 558                                 /* Try next handler in the list */
 559
 560                                 handler_obj = handler_obj->address_space.next;
 561                         }
 562                 }
 563
 564                 /*
 565                  * This node does not have the handler we need;
 566                  * Pop up one level
 567                  */
 568                 node = acpi_ns_get_parent_node(node);
 569         }
 570
 571         /* If we get here, there is no handler for this region */
 572
 573         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 574                           "No handler for region_type %s(%X) (region_obj %p)\n",
 575                           acpi_ut_get_region_name(space_id), space_id,
 576                           region_obj));
 577
 578         return_ACPI_STATUS(AE_NOT_EXIST);
 579 }