drivers/acpi/acpica/evrgnini.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evrgnini- ACPI address_space (op_region) init
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2011, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acevents.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evrgnini")
  51
  52 /* Local prototypes */
  53 static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ev_system_memory_region_setup
  58  *
  59  * PARAMETERS:  Handle              - Region we are interested in
  60  *              Function            - Start or stop
  61  *              handler_context     - Address space handler context
  62  *              region_context      - Region specific context
  63  *
  64  * RETURN:      Status
  65  *
  66  * DESCRIPTION: Setup a system_memory operation region
  67  *
  68  ******************************************************************************/
  69
  70 acpi_status
  71 acpi_ev_system_memory_region_setup(acpi_handle handle,
  72                                    u32 function,
  73                                    void *handler_context, void **region_context)
  74 {
  75         union acpi_operand_object *region_desc =
  76             (union acpi_operand_object *)handle;
  77         struct acpi_mem_space_context *local_region_context;
  78
  79         ACPI_FUNCTION_TRACE(ev_system_memory_region_setup);
  80
  81         if (function == ACPI_REGION_DEACTIVATE) {
  82                 if (*region_context) {
  83                         local_region_context =
  84                             (struct acpi_mem_space_context *)*region_context;
  85
  86                         /* Delete a cached mapping if present */
  87
  88                         if (local_region_context->mapped_length) {
  89                                 acpi_os_unmap_memory(local_region_context->
  90                                                      mapped_logical_address,
  91                                                      local_region_context->
  92                                                      mapped_length);
  93                         }
  94                         ACPI_FREE(local_region_context);
  95                         *region_context = NULL;
  96                 }
  97                 return_ACPI_STATUS(AE_OK);
  98         }
  99
 100         /* Create a new context */
 101
 102         local_region_context =
 103             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_mem_space_context));
 104         if (!(local_region_context)) {
 105                 return_ACPI_STATUS(AE_NO_MEMORY);
 106         }
 107
 108         /* Save the region length and address for use in the handler */
 109
 110         local_region_context->length = region_desc->region.length;
 111         local_region_context->address = region_desc->region.address;
 112
 113         *region_context = local_region_context;
 114         return_ACPI_STATUS(AE_OK);
 115 }
 116
 117 /*******************************************************************************
 118  *
 119  * FUNCTION:    acpi_ev_io_space_region_setup
 120  *
 121  * PARAMETERS:  Handle              - Region we are interested in
 122  *              Function            - Start or stop
 123  *              handler_context     - Address space handler context
 124  *              region_context      - Region specific context
 125  *
 126  * RETURN:      Status
 127  *
 128  * DESCRIPTION: Setup a IO operation region
 129  *
 130  ******************************************************************************/
 131
 132 acpi_status
 133 acpi_ev_io_space_region_setup(acpi_handle handle,
 134                               u32 function,
 135                               void *handler_context, void **region_context)
 136 {
 137         ACPI_FUNCTION_TRACE(ev_io_space_region_setup);
 138
 139         if (function == ACPI_REGION_DEACTIVATE) {
 140                 *region_context = NULL;
 141         } else {
 142                 *region_context = handler_context;
 143         }
 144
 145         return_ACPI_STATUS(AE_OK);
 146 }
 147
 148 /*******************************************************************************
 149  *
 150  * FUNCTION:    acpi_ev_pci_config_region_setup
 151  *
 152  * PARAMETERS:  Handle              - Region we are interested in
 153  *              Function            - Start or stop
 154  *              handler_context     - Address space handler context
 155  *              region_context      - Region specific context
 156  *
 157  * RETURN:      Status
 158  *
 159  * DESCRIPTION: Setup a PCI_Config operation region
 160  *
 161  * MUTEX:       Assumes namespace is not locked
 162  *
 163  ******************************************************************************/
 164
 165 acpi_status
 166 acpi_ev_pci_config_region_setup(acpi_handle handle,
 167                                 u32 function,
 168                                 void *handler_context, void **region_context)
 169 {
 170         acpi_status status = AE_OK;
 171         u64 pci_value;
 172         struct acpi_pci_id *pci_id = *region_context;
 173         union acpi_operand_object *handler_obj;
 174         struct acpi_namespace_node *parent_node;
 175         struct acpi_namespace_node *pci_root_node;
 176         struct acpi_namespace_node *pci_device_node;
 177         union acpi_operand_object *region_obj =
 178             (union acpi_operand_object *)handle;
 179
 180         ACPI_FUNCTION_TRACE(ev_pci_config_region_setup);
 181
 182         handler_obj = region_obj->region.handler;
 183         if (!handler_obj) {
 184                 /*
 185                  * No installed handler. This shouldn't happen because the dispatch
 186                  * routine checks before we get here, but we check again just in case.
 187                  */
 188                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 189                                   "Attempting to init a region %p, with no handler\n",
 190                                   region_obj));
 191                 return_ACPI_STATUS(AE_NOT_EXIST);
 192         }
 193
 194         *region_context = NULL;
 195         if (function == ACPI_REGION_DEACTIVATE) {
 196                 if (pci_id) {
 197                         ACPI_FREE(pci_id);
 198                 }
 199                 return_ACPI_STATUS(status);
 200         }
 201
 202         parent_node = region_obj->region.node->parent;
 203
 204         /*
 205          * Get the _SEG and _BBN values from the device upon which the handler
 206          * is installed.
 207          *
 208          * We need to get the _SEG and _BBN objects relative to the PCI BUS device.
 209          * This is the device the handler has been registered to handle.
 210          */
 211
 212         /*
 213          * If the address_space.Node is still pointing to the root, we need
 214          * to scan upward for a PCI Root bridge and re-associate the op_region
 215          * handlers with that device.
 216          */
 217         if (handler_obj->address_space.node == acpi_gbl_root_node) {
 218
 219                 /* Start search from the parent object */
 220
 221                 pci_root_node = parent_node;
 222                 while (pci_root_node != acpi_gbl_root_node) {
 223
 224                         /* Get the _HID/_CID in order to detect a root_bridge */
 225
 226                         if (acpi_ev_is_pci_root_bridge(pci_root_node)) {
 227
 228                                 /* Install a handler for this PCI root bridge */
 229
 230                                 status =
 231                                     acpi_install_address_space_handler((acpi_handle) pci_root_node, ACPI_ADR_SPACE_PCI_CONFIG, ACPI_DEFAULT_HANDLER, NULL, NULL);
 232                                 if (ACPI_FAILURE(status)) {
 233                                         if (status == AE_SAME_HANDLER) {
 234                                                 /*
 235                                                  * It is OK if the handler is already installed on the
 236                                                  * root bridge. Still need to return a context object
 237                                                  * for the new PCI_Config operation region, however.
 238                                                  */
 239                                                 status = AE_OK;
 240                                         } else {
 241                                                 ACPI_EXCEPTION((AE_INFO, status,
 242                                                                 "Could not install PciConfig handler "
 243                                                                 "for Root Bridge %4.4s",
 244                                                                 acpi_ut_get_node_name
 245                                                                 (pci_root_node)));
 246                                         }
 247                                 }
 248                                 break;
 249                         }
 250
 251                         pci_root_node = pci_root_node->parent;
 252                 }
 253
 254                 /* PCI root bridge not found, use namespace root node */
 255         } else {
 256                 pci_root_node = handler_obj->address_space.node;
 257         }
 258
 259         /*
 260          * If this region is now initialized, we are done.
 261          * (install_address_space_handler could have initialized it)
 262          */
 263         if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
 264                 return_ACPI_STATUS(AE_OK);
 265         }
 266
 267         /* Region is still not initialized. Create a new context */
 268
 269         pci_id = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pci_id));
 270         if (!pci_id) {
 271                 return_ACPI_STATUS(AE_NO_MEMORY);
 272         }
 273
 274         /*
 275          * For PCI_Config space access, we need the segment, bus, device and
 276          * function numbers. Acquire them here.
 277          *
 278          * Find the parent device object. (This allows the operation region to be
 279          * within a subscope under the device, such as a control method.)
 280          */
 281         pci_device_node = region_obj->region.node;
 282         while (pci_device_node && (pci_device_node->type != ACPI_TYPE_DEVICE)) {
 283                 pci_device_node = pci_device_node->parent;
 284         }
 285
 286         if (!pci_device_node) {
 287                 ACPI_FREE(pci_id);
 288                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 289         }
 290
 291         /*
 292          * Get the PCI device and function numbers from the _ADR object
 293          * contained in the parent's scope.
 294          */
 295         status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR,
 296                                                  pci_device_node, &pci_value);
 297
 298         /*
 299          * The default is zero, and since the allocation above zeroed the data,
 300          * just do nothing on failure.
 301          */
 302         if (ACPI_SUCCESS(status)) {
 303                 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(pci_value));
 304                 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(pci_value));
 305         }
 306
 307         /* The PCI segment number comes from the _SEG method */
 308
 309         status = acpi_ut_evaluate_numeric_object(METHOD_NAME__SEG,
 310                                                  pci_root_node, &pci_value);
 311         if (ACPI_SUCCESS(status)) {
 312                 pci_id->segment = ACPI_LOWORD(pci_value);
 313         }
 314
 315         /* The PCI bus number comes from the _BBN method */
 316
 317         status = acpi_ut_evaluate_numeric_object(METHOD_NAME__BBN,
 318                                                  pci_root_node, &pci_value);
 319         if (ACPI_SUCCESS(status)) {
 320                 pci_id->bus = ACPI_LOWORD(pci_value);
 321         }
 322
 323         /* Complete/update the PCI ID for this device */
 324
 325         status =
 326             acpi_hw_derive_pci_id(pci_id, pci_root_node,
 327                                   region_obj->region.node);
 328         if (ACPI_FAILURE(status)) {
 329                 ACPI_FREE(pci_id);
 330                 return_ACPI_STATUS(status);
 331         }
 332
 333         *region_context = pci_id;
 334         return_ACPI_STATUS(AE_OK);
 335 }
 336
 337 /*******************************************************************************
 338  *
 339  * FUNCTION:    acpi_ev_is_pci_root_bridge
 340  *
 341  * PARAMETERS:  Node            - Device node being examined
 342  *
 343  * RETURN:      TRUE if device is a PCI/PCI-Express Root Bridge
 344  *
 345  * DESCRIPTION: Determine if the input device represents a PCI Root Bridge by
 346  *              examining the _HID and _CID for the device.
 347  *
 348  ******************************************************************************/
 349
 350 static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node)
 351 {
 352         acpi_status status;
 353         struct acpica_device_id *hid;
 354         struct acpica_device_id_list *cid;
 355         u32 i;
 356         u8 match;
 357
 358         /* Get the _HID and check for a PCI Root Bridge */
 359
 360         status = acpi_ut_execute_HID(node, &hid);
 361         if (ACPI_FAILURE(status)) {
 362                 return (FALSE);
 363         }
 364
 365         match = acpi_ut_is_pci_root_bridge(hid->string);
 366         ACPI_FREE(hid);
 367
 368         if (match) {
 369                 return (TRUE);
 370         }
 371
 372         /* The _HID did not match. Get the _CID and check for a PCI Root Bridge */
 373
 374         status = acpi_ut_execute_CID(node, &cid);
 375         if (ACPI_FAILURE(status)) {
 376                 return (FALSE);
 377         }
 378
 379         /* Check all _CIDs in the returned list */
 380
 381         for (i = 0; i < cid->count; i++) {
 382                 if (acpi_ut_is_pci_root_bridge(cid->ids[i].string)) {
 383                         ACPI_FREE(cid);
 384                         return (TRUE);
 385                 }
 386         }
 387
 388         ACPI_FREE(cid);
 389         return (FALSE);
 390 }
 391
 392 /*******************************************************************************
 393  *
 394  * FUNCTION:    acpi_ev_pci_bar_region_setup
 395  *
 396  * PARAMETERS:  Handle              - Region we are interested in
 397  *              Function            - Start or stop
 398  *              handler_context     - Address space handler context
 399  *              region_context      - Region specific context
 400  *
 401  * RETURN:      Status
 402  *
 403  * DESCRIPTION: Setup a pci_bAR operation region
 404  *
 405  * MUTEX:       Assumes namespace is not locked
 406  *
 407  ******************************************************************************/
 408
 409 acpi_status
 410 acpi_ev_pci_bar_region_setup(acpi_handle handle,
 411                              u32 function,
 412                              void *handler_context, void **region_context)
 413 {
 414         ACPI_FUNCTION_TRACE(ev_pci_bar_region_setup);
 415
 416         return_ACPI_STATUS(AE_OK);
 417 }
 418
 419 /*******************************************************************************
 420  *
 421  * FUNCTION:    acpi_ev_cmos_region_setup
 422  *
 423  * PARAMETERS:  Handle              - Region we are interested in
 424  *              Function            - Start or stop
 425  *              handler_context     - Address space handler context
 426  *              region_context      - Region specific context
 427  *
 428  * RETURN:      Status
 429  *
 430  * DESCRIPTION: Setup a CMOS operation region
 431  *
 432  * MUTEX:       Assumes namespace is not locked
 433  *
 434  ******************************************************************************/
 435
 436 acpi_status
 437 acpi_ev_cmos_region_setup(acpi_handle handle,
 438                           u32 function,
 439                           void *handler_context, void **region_context)
 440 {
 441         ACPI_FUNCTION_TRACE(ev_cmos_region_setup);
 442
 443         return_ACPI_STATUS(AE_OK);
 444 }
 445
 446 /*******************************************************************************
 447  *
 448  * FUNCTION:    acpi_ev_default_region_setup
 449  *
 450  * PARAMETERS:  Handle              - Region we are interested in
 451  *              Function            - Start or stop
 452  *              handler_context     - Address space handler context
 453  *              region_context      - Region specific context
 454  *
 455  * RETURN:      Status
 456  *
 457  * DESCRIPTION: Default region initialization
 458  *
 459  ******************************************************************************/
 460
 461 acpi_status
 462 acpi_ev_default_region_setup(acpi_handle handle,
 463                              u32 function,
 464                              void *handler_context, void **region_context)
 465 {
 466         ACPI_FUNCTION_TRACE(ev_default_region_setup);
 467
 468         if (function == ACPI_REGION_DEACTIVATE) {
 469                 *region_context = NULL;
 470         } else {
 471                 *region_context = handler_context;
 472         }
 473
 474         return_ACPI_STATUS(AE_OK);
 475 }
 476
 477 /*******************************************************************************
 478  *
 479  * FUNCTION:    acpi_ev_initialize_region
 480  *
 481  * PARAMETERS:  region_obj      - Region we are initializing
 482  *              acpi_ns_locked  - Is namespace locked?
 483  *
 484  * RETURN:      Status
 485  *
 486  * DESCRIPTION: Initializes the region, finds any _REG methods and saves them
 487  *              for execution at a later time
 488  *
 489  *              Get the appropriate address space handler for a newly
 490  *              created region.
 491  *
 492  *              This also performs address space specific initialization. For
 493  *              example, PCI regions must have an _ADR object that contains
 494  *              a PCI address in the scope of the definition. This address is
 495  *              required to perform an access to PCI config space.
 496  *
 497  * MUTEX:       Interpreter should be unlocked, because we may run the _REG
 498  *              method for this region.
 499  *
 500  ******************************************************************************/
 501
 502 acpi_status
 503 acpi_ev_initialize_region(union acpi_operand_object *region_obj,
 504                           u8 acpi_ns_locked)
 505 {
 506         union acpi_operand_object *handler_obj;
 507         union acpi_operand_object *obj_desc;
 508         acpi_adr_space_type space_id;
 509         struct acpi_namespace_node *node;
 510         acpi_status status;
 511         struct acpi_namespace_node *method_node;
 512         acpi_name *reg_name_ptr = (acpi_name *) METHOD_NAME__REG;
 513         union acpi_operand_object *region_obj2;
 514
 515         ACPI_FUNCTION_TRACE_U32(ev_initialize_region, acpi_ns_locked);
 516
 517         if (!region_obj) {
 518                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 519         }
 520
 521         if (region_obj->common.flags & AOPOBJ_OBJECT_INITIALIZED) {
 522                 return_ACPI_STATUS(AE_OK);
 523         }
 524
 525         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 526         if (!region_obj2) {
 527                 return_ACPI_STATUS(AE_NOT_EXIST);
 528         }
 529
 530         node = region_obj->region.node->parent;
 531         space_id = region_obj->region.space_id;
 532
 533         /* Setup defaults */
 534
 535         region_obj->region.handler = NULL;
 536         region_obj2->extra.method_REG = NULL;
 537         region_obj->common.flags &= ~(AOPOBJ_SETUP_COMPLETE);
 538         region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED;
 539
 540         /* Find any "_REG" method associated with this region definition */
 541
 542         status =
 543             acpi_ns_search_one_scope(*reg_name_ptr, node, ACPI_TYPE_METHOD,
 544                                      &method_node);
 545         if (ACPI_SUCCESS(status)) {
 546                 /*
 547                  * The _REG method is optional and there can be only one per region
 548                  * definition. This will be executed when the handler is attached
 549                  * or removed
 550                  */
 551                 region_obj2->extra.method_REG = method_node;
 552         }
 553
 554         /*
 555          * The following loop depends upon the root Node having no parent
 556          * ie: acpi_gbl_root_node->parent_entry being set to NULL
 557          */
 558         while (node) {
 559
 560                 /* Check to see if a handler exists */
 561
 562                 handler_obj = NULL;
 563                 obj_desc = acpi_ns_get_attached_object(node);
 564                 if (obj_desc) {
 565
 566                         /* Can only be a handler if the object exists */
 567
 568                         switch (node->type) {
 569                         case ACPI_TYPE_DEVICE:
 570
 571                                 handler_obj = obj_desc->device.handler;
 572                                 break;
 573
 574                         case ACPI_TYPE_PROCESSOR:
 575
 576                                 handler_obj = obj_desc->processor.handler;
 577                                 break;
 578
 579                         case ACPI_TYPE_THERMAL:
 580
 581                                 handler_obj = obj_desc->thermal_zone.handler;
 582                                 break;
 583
 584                         case ACPI_TYPE_METHOD:
 585                                 /*
 586                                  * If we are executing module level code, the original
 587                                  * Node's object was replaced by this Method object and we
 588                                  * saved the handler in the method object.
 589                                  *
 590                                  * See acpi_ns_exec_module_code
 591                                  */
 592                                 if (obj_desc->method.
 593                                     info_flags & ACPI_METHOD_MODULE_LEVEL) {
 594                                         handler_obj =
 595                                             obj_desc->method.dispatch.handler;
 596                                 }
 597                                 break;
 598
 599                         default:
 600                                 /* Ignore other objects */
 601                                 break;
 602                         }
 603
 604                         while (handler_obj) {
 605
 606                                 /* Is this handler of the correct type? */
 607
 608                                 if (handler_obj->address_space.space_id ==
 609                                     space_id) {
 610
 611                                         /* Found correct handler */
 612
 613                                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 614                                                           "Found handler %p for region %p in obj %p\n",
 615                                                           handler_obj,
 616                                                           region_obj,
 617                                                           obj_desc));
 618
 619                                         status =
 620                                             acpi_ev_attach_region(handler_obj,
 621                                                                   region_obj,
 622                                                                   acpi_ns_locked);
 623
 624                                         /*
 625                                          * Tell all users that this region is usable by
 626                                          * running the _REG method
 627                                          */
 628                                         if (acpi_ns_locked) {
 629                                                 status =
 630                                                     acpi_ut_release_mutex
 631                                                     (ACPI_MTX_NAMESPACE);
 632                                                 if (ACPI_FAILURE(status)) {
 633                                                         return_ACPI_STATUS
 634                                                             (status);
 635                                                 }
 636                                         }
 637
 638                                         status =
 639                                             acpi_ev_execute_reg_method
 640                                             (region_obj, ACPI_REG_CONNECT);
 641
 642                                         if (acpi_ns_locked) {
 643                                                 status =
 644                                                     acpi_ut_acquire_mutex
 645                                                     (ACPI_MTX_NAMESPACE);
 646                                                 if (ACPI_FAILURE(status)) {
 647                                                         return_ACPI_STATUS
 648                                                             (status);
 649                                                 }
 650                                         }
 651
 652                                         return_ACPI_STATUS(AE_OK);
 653                                 }
 654
 655                                 /* Try next handler in the list */
 656
 657                                 handler_obj = handler_obj->address_space.next;
 658                         }
 659                 }
 660
 661                 /* This node does not have the handler we need; Pop up one level */
 662
 663                 node = node->parent;
 664         }
 665
 666         /* If we get here, there is no handler for this region */
 667
 668         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 669                           "No handler for RegionType %s(%X) (RegionObj %p)\n",
 670                           acpi_ut_get_region_name(space_id), space_id,
 671                           region_obj));
 672
 673         return_ACPI_STATUS(AE_NOT_EXIST);
 674 }