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 - 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
  49 #define _COMPONENT          ACPI_EVENTS
  50          ACPI_MODULE_NAME    ("evrgnini")
  51
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_ev_system_memory_region_setup
  56  *
  57  * PARAMETERS:  Handle              - Region we are interested in
  58  *              Function            - Start or stop
  59  *              handler_context     - Address space handler context
  60  *              region_context      - Region specific context
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: Do any prep work for region handling, a nop for now
  65  *
  66  ******************************************************************************/
  67
  68 acpi_status
  69 acpi_ev_system_memory_region_setup (
  70         acpi_handle                     handle,
  71         u32                             function,
  72         void                            *handler_context,
  73         void                            **region_context)
  74 {
  75         union acpi_operand_object       *region_desc = (union acpi_operand_object *) handle;
  76         struct acpi_mem_space_context   *local_region_context;
  77
  78
  79         ACPI_FUNCTION_TRACE ("ev_system_memory_region_setup");
  80
  81
  82         if (function == ACPI_REGION_DEACTIVATE) {
  83                 if (*region_context) {
  84                         ACPI_MEM_FREE (*region_context);
  85                         *region_context = NULL;
  86                 }
  87                 return_ACPI_STATUS (AE_OK);
  88         }
  89
  90         /* Create a new context */
  91
  92         local_region_context = ACPI_MEM_CALLOCATE (sizeof (struct acpi_mem_space_context));
  93         if (!(local_region_context)) {
  94                 return_ACPI_STATUS (AE_NO_MEMORY);
  95         }
  96
  97         /* Save the region length and address for use in the handler */
  98
  99         local_region_context->length = region_desc->region.length;
 100         local_region_context->address = region_desc->region.address;
 101
 102         *region_context = local_region_context;
 103         return_ACPI_STATUS (AE_OK);
 104 }
 105
 106
 107 /*******************************************************************************
 108  *
 109  * FUNCTION:    acpi_ev_io_space_region_setup
 110  *
 111  * PARAMETERS:  Handle              - Region we are interested in
 112  *              Function            - Start or stop
 113  *              handler_context     - Address space handler context
 114  *              region_context      - Region specific context
 115  *
 116  * RETURN:      Status
 117  *
 118  * DESCRIPTION: Do any prep work for region handling
 119  *
 120  ******************************************************************************/
 121
 122 acpi_status
 123 acpi_ev_io_space_region_setup (
 124         acpi_handle                     handle,
 125         u32                             function,
 126         void                            *handler_context,
 127         void                            **region_context)
 128 {
 129         ACPI_FUNCTION_TRACE ("ev_io_space_region_setup");
 130
 131
 132         if (function == ACPI_REGION_DEACTIVATE) {
 133                 *region_context = NULL;
 134         }
 135         else {
 136                 *region_context = handler_context;
 137         }
 138
 139         return_ACPI_STATUS (AE_OK);
 140 }
 141
 142
 143 /*******************************************************************************
 144  *
 145  * FUNCTION:    acpi_ev_pci_config_region_setup
 146  *
 147  * PARAMETERS:  Handle             - Region we are interested in
 148  *              Function            - Start or stop
 149  *              handler_context     - Address space handler context
 150  *              region_context      - Region specific context
 151  *
 152  * RETURN:      Status
 153  *
 154  * DESCRIPTION: Do any prep work for region handling
 155  *
 156  * MUTEX:       Assumes namespace is not locked
 157  *
 158  ******************************************************************************/
 159
 160 acpi_status
 161 acpi_ev_pci_config_region_setup (
 162         acpi_handle                     handle,
 163         u32                             function,
 164         void                            *handler_context,
 165         void                            **region_context)
 166 {
 167         acpi_status                     status = AE_OK;
 168         acpi_integer                    pci_value;
 169         struct acpi_pci_id              *pci_id = *region_context;
 170         union acpi_operand_object       *handler_obj;
 171         struct acpi_namespace_node      *parent_node;
 172         struct acpi_namespace_node      *pci_root_node;
 173         union acpi_operand_object       *region_obj = (union acpi_operand_object   *) handle;
 174         struct acpi_device_id           object_hID;
 175
 176
 177         ACPI_FUNCTION_TRACE ("ev_pci_config_region_setup");
 178
 179
 180         handler_obj = region_obj->region.handler;
 181         if (!handler_obj) {
 182                 /*
 183                  * No installed handler. This shouldn't happen because the dispatch
 184                  * routine checks before we get here, but we check again just in case.
 185                  */
 186                 ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 187                         "Attempting to init a region %p, with no handler\n", region_obj));
 188                 return_ACPI_STATUS (AE_NOT_EXIST);
 189         }
 190
 191         *region_context = NULL;
 192         if (function == ACPI_REGION_DEACTIVATE) {
 193                 if (pci_id) {
 194                         ACPI_MEM_FREE (pci_id);
 195                 }
 196                 return_ACPI_STATUS (status);
 197         }
 198
 199         parent_node = acpi_ns_get_parent_node (region_obj->region.node);
 200
 201         /*
 202          * Get the _SEG and _BBN values from the device upon which the handler
 203          * is installed.
 204          *
 205          * We need to get the _SEG and _BBN objects relative to the PCI BUS device.
 206          * This is the device the handler has been registered to handle.
 207          */
 208
 209         /*
 210          * If the address_space.Node is still pointing to the root, we need
 211          * to scan upward for a PCI Root bridge and re-associate the op_region
 212          * handlers with that device.
 213          */
 214         if (handler_obj->address_space.node == acpi_gbl_root_node) {
 215                 /* Start search from the parent object */
 216
 217                 pci_root_node = parent_node;
 218                 while (pci_root_node != acpi_gbl_root_node) {
 219                         status = acpi_ut_execute_HID (pci_root_node, &object_hID);
 220                         if (ACPI_SUCCESS (status)) {
 221                                 /* Got a valid _HID, check if this is a PCI root */
 222
 223                                 if (!(ACPI_STRNCMP (object_hID.value, PCI_ROOT_HID_STRING,
 224                                                    sizeof (PCI_ROOT_HID_STRING)))) {
 225                                         /* Install a handler for this PCI root bridge */
 226
 227                                         status = acpi_install_address_space_handler ((acpi_handle) pci_root_node,
 228                                                            ACPI_ADR_SPACE_PCI_CONFIG,
 229                                                            ACPI_DEFAULT_HANDLER, NULL, NULL);
 230                                         if (ACPI_FAILURE (status)) {
 231                                                 if (status == AE_SAME_HANDLER) {
 232                                                         /*
 233                                                          * It is OK if the handler is already installed on the root
 234                                                          * bridge.  Still need to return a context object for the
 235                                                          * new PCI_Config operation region, however.
 236                                                          */
 237                                                         status = AE_OK;
 238                                                 }
 239                                                 else {
 240                                                         ACPI_REPORT_ERROR ((
 241                                                                 "Could not install pci_config handler for Root Bridge %4.4s, %s\n",
 242                                                                 acpi_ut_get_node_name (pci_root_node), acpi_format_exception (status)));
 243                                                 }
 244                                         }
 245                                         break;
 246                                 }
 247                         }
 248
 249                         pci_root_node = acpi_ns_get_parent_node (pci_root_node);
 250                 }
 251
 252                 /* PCI root bridge not found, use namespace root node */
 253         }
 254         else {
 255                 pci_root_node = handler_obj->address_space.node;
 256         }
 257
 258         /*
 259          * If this region is now initialized, we are done.
 260          * (install_address_space_handler could have initialized it)
 261          */
 262         if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
 263                 return_ACPI_STATUS (AE_OK);
 264         }
 265
 266         /* Region is still not initialized. Create a new context */
 267
 268         pci_id = ACPI_MEM_CALLOCATE (sizeof (struct acpi_pci_id));
 269         if (!pci_id) {
 270                 return_ACPI_STATUS (AE_NO_MEMORY);
 271         }
 272
 273         /*
 274          * For PCI_Config space access, we need the segment, bus,
 275          * device and function numbers.  Acquire them here.
 276          */
 277
 278         /*
 279          * Get the PCI device and function numbers from the _ADR object
 280          * contained in the parent's scope.
 281          */
 282         status = acpi_ut_evaluate_numeric_object (METHOD_NAME__ADR, parent_node, &pci_value);
 283
 284         /*
 285          * The default is zero, and since the allocation above zeroed
 286          * the data, just do nothing on failure.
 287          */
 288         if (ACPI_SUCCESS (status)) {
 289                 pci_id->device  = ACPI_HIWORD (ACPI_LODWORD (pci_value));
 290                 pci_id->function = ACPI_LOWORD (ACPI_LODWORD (pci_value));
 291         }
 292
 293         /* The PCI segment number comes from the _SEG method */
 294
 295         status = acpi_ut_evaluate_numeric_object (METHOD_NAME__SEG, pci_root_node, &pci_value);
 296         if (ACPI_SUCCESS (status)) {
 297                 pci_id->segment = ACPI_LOWORD (pci_value);
 298         }
 299
 300         /* The PCI bus number comes from the _BBN method */
 301
 302         status = acpi_ut_evaluate_numeric_object (METHOD_NAME__BBN, pci_root_node, &pci_value);
 303         if (ACPI_SUCCESS (status)) {
 304                 pci_id->bus = ACPI_LOWORD (pci_value);
 305         }
 306
 307         /* Complete this device's pci_id */
 308
 309         acpi_os_derive_pci_id (pci_root_node, region_obj->region.node, &pci_id);
 310
 311         *region_context = pci_id;
 312         return_ACPI_STATUS (AE_OK);
 313 }
 314
 315
 316 /*******************************************************************************
 317  *
 318  * FUNCTION:    acpi_ev_pci_bar_region_setup
 319  *
 320  * PARAMETERS:  Handle              - Region we are interested in
 321  *              Function            - Start or stop
 322  *              handler_context     - Address space handler context
 323  *              region_context      - Region specific context
 324  *
 325  * RETURN:      Status
 326  *
 327  * DESCRIPTION: Do any prep work for region handling
 328  *
 329  * MUTEX:       Assumes namespace is not locked
 330  *
 331  ******************************************************************************/
 332
 333 acpi_status
 334 acpi_ev_pci_bar_region_setup (
 335         acpi_handle                     handle,
 336         u32                             function,
 337         void                            *handler_context,
 338         void                            **region_context)
 339 {
 340         ACPI_FUNCTION_TRACE ("ev_pci_bar_region_setup");
 341
 342
 343         return_ACPI_STATUS (AE_OK);
 344 }
 345
 346
 347 /*******************************************************************************
 348  *
 349  * FUNCTION:    acpi_ev_cmos_region_setup
 350  *
 351  * PARAMETERS:  Handle              - Region we are interested in
 352  *              Function            - Start or stop
 353  *              handler_context     - Address space handler context
 354  *              region_context      - Region specific context
 355  *
 356  * RETURN:      Status
 357  *
 358  * DESCRIPTION: Do any prep work for region handling
 359  *
 360  * MUTEX:       Assumes namespace is not locked
 361  *
 362  ******************************************************************************/
 363
 364 acpi_status
 365 acpi_ev_cmos_region_setup (
 366         acpi_handle                     handle,
 367         u32                             function,
 368         void                            *handler_context,
 369         void                            **region_context)
 370 {
 371         ACPI_FUNCTION_TRACE ("ev_cmos_region_setup");
 372
 373
 374         return_ACPI_STATUS (AE_OK);
 375 }
 376
 377
 378 /*******************************************************************************
 379  *
 380  * FUNCTION:    acpi_ev_default_region_setup
 381  *
 382  * PARAMETERS:  Handle              - Region we are interested in
 383  *              Function            - Start or stop
 384  *              handler_context     - Address space handler context
 385  *              region_context      - Region specific context
 386  *
 387  * RETURN:      Status
 388  *
 389  * DESCRIPTION: Do any prep work for region handling
 390  *
 391  ******************************************************************************/
 392
 393 acpi_status
 394 acpi_ev_default_region_setup (
 395         acpi_handle                     handle,
 396         u32                             function,
 397         void                            *handler_context,
 398         void                            **region_context)
 399 {
 400         ACPI_FUNCTION_TRACE ("ev_default_region_setup");
 401
 402
 403         if (function == ACPI_REGION_DEACTIVATE) {
 404                 *region_context = NULL;
 405         }
 406         else {
 407                 *region_context = handler_context;
 408         }
 409
 410         return_ACPI_STATUS (AE_OK);
 411 }
 412
 413
 414 /*******************************************************************************
 415  *
 416  * FUNCTION:    acpi_ev_initialize_region
 417  *
 418  * PARAMETERS:  region_obj      - Region we are initializing
 419  *              acpi_ns_locked  - Is namespace locked?
 420  *
 421  * RETURN:      Status
 422  *
 423  * DESCRIPTION: Initializes the region, finds any _REG methods and saves them
 424  *              for execution at a later time
 425  *
 426  *              Get the appropriate address space handler for a newly
 427  *              created region.
 428  *
 429  *              This also performs address space specific initialization.  For
 430  *              example, PCI regions must have an _ADR object that contains
 431  *              a PCI address in the scope of the definition.  This address is
 432  *              required to perform an access to PCI config space.
 433  *
 434  ******************************************************************************/
 435
 436 acpi_status
 437 acpi_ev_initialize_region (
 438         union acpi_operand_object       *region_obj,
 439         u8                              acpi_ns_locked)
 440 {
 441         union acpi_operand_object       *handler_obj;
 442         union acpi_operand_object       *obj_desc;
 443         acpi_adr_space_type             space_id;
 444         struct acpi_namespace_node      *node;
 445         acpi_status                     status;
 446         struct acpi_namespace_node      *method_node;
 447         acpi_name                       *reg_name_ptr = (acpi_name *) METHOD_NAME__REG;
 448         union acpi_operand_object       *region_obj2;
 449
 450
 451         ACPI_FUNCTION_TRACE_U32 ("ev_initialize_region", acpi_ns_locked);
 452
 453
 454         if (!region_obj) {
 455                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 456         }
 457
 458         if (region_obj->common.flags & AOPOBJ_OBJECT_INITIALIZED) {
 459                 return_ACPI_STATUS (AE_OK);
 460         }
 461
 462         region_obj2 = acpi_ns_get_secondary_object (region_obj);
 463         if (!region_obj2) {
 464                 return_ACPI_STATUS (AE_NOT_EXIST);
 465         }
 466
 467         node = acpi_ns_get_parent_node (region_obj->region.node);
 468         space_id = region_obj->region.space_id;
 469
 470         /* Setup defaults */
 471
 472         region_obj->region.handler = NULL;
 473         region_obj2->extra.method_REG = NULL;
 474         region_obj->common.flags &= ~(AOPOBJ_SETUP_COMPLETE);
 475         region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED;
 476
 477         /* Find any "_REG" method associated with this region definition */
 478
 479         status = acpi_ns_search_node (*reg_name_ptr, node,
 480                           ACPI_TYPE_METHOD, &method_node);
 481         if (ACPI_SUCCESS (status)) {
 482                 /*
 483                  * The _REG method is optional and there can be only one per region
 484                  * definition.  This will be executed when the handler is attached
 485                  * or removed
 486                  */
 487                 region_obj2->extra.method_REG = method_node;
 488         }
 489
 490         /*
 491          * The following loop depends upon the root Node having no parent
 492          * ie: acpi_gbl_root_node->parent_entry being set to NULL
 493          */
 494         while (node) {
 495                 /* Check to see if a handler exists */
 496
 497                 handler_obj = NULL;
 498                 obj_desc = acpi_ns_get_attached_object (node);
 499                 if (obj_desc) {
 500                         /* Can only be a handler if the object exists */
 501
 502                         switch (node->type) {
 503                         case ACPI_TYPE_DEVICE:
 504
 505                                 handler_obj = obj_desc->device.handler;
 506                                 break;
 507
 508                         case ACPI_TYPE_PROCESSOR:
 509
 510                                 handler_obj = obj_desc->processor.handler;
 511                                 break;
 512
 513                         case ACPI_TYPE_THERMAL:
 514
 515                                 handler_obj = obj_desc->thermal_zone.handler;
 516                                 break;
 517
 518                         default:
 519                                 /* Ignore other objects */
 520                                 break;
 521                         }
 522
 523                         while (handler_obj) {
 524                                 /* Is this handler of the correct type? */
 525
 526                                 if (handler_obj->address_space.space_id == space_id) {
 527                                         /* Found correct handler */
 528
 529                                         ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 530                                                 "Found handler %p for region %p in obj %p\n",
 531                                                 handler_obj, region_obj, obj_desc));
 532
 533                                         status = acpi_ev_attach_region (handler_obj, region_obj,
 534                                                          acpi_ns_locked);
 535
 536                                         /*
 537                                          * Tell all users that this region is usable by running the _REG
 538                                          * method
 539                                          */
 540                                         if (acpi_ns_locked) {
 541                                                 status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 542                                                 if (ACPI_FAILURE (status)) {
 543                                                         return_ACPI_STATUS (status);
 544                                                 }
 545                                         }
 546
 547                                         status = acpi_ev_execute_reg_method (region_obj, 1);
 548
 549                                         if (acpi_ns_locked) {
 550                                                 status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 551                                                 if (ACPI_FAILURE (status)) {
 552                                                         return_ACPI_STATUS (status);
 553                                                 }
 554                                         }
 555
 556                                         return_ACPI_STATUS (AE_OK);
 557                                 }
 558
 559                                 /* Try next handler in the list */
 560
 561                                 handler_obj = handler_obj->address_space.next;
 562                         }
 563                 }
 564
 565                 /*
 566                  * This node does not have the handler we need;
 567                  * Pop up one level
 568                  */
 569                 node = acpi_ns_get_parent_node (node);
 570         }
 571
 572         /* If we get here, there is no handler for this region */
 573
 574         ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 575                 "No handler for region_type %s(%X) (region_obj %p)\n",
 576                 acpi_ut_get_region_name (space_id), space_id, region_obj));
 577
 578         return_ACPI_STATUS (AE_NOT_EXIST);
 579 }
 580