git.oblomov.eu Git - linux-2.6/blob - 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 - 2007, 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 /* Local prototypes */
  52 static u8 acpi_ev_match_pci_root_bridge(char *id);
  53
  54 static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node);
  55
  56 /*******************************************************************************
  57  *
  58  * FUNCTION:    acpi_ev_system_memory_region_setup
  59  *
  60  * PARAMETERS:  Handle              - Region we are interested in
  61  *              Function            - Start or stop
  62  *              handler_context     - Address space handler context
  63  *              region_context      - Region specific context
  64  *
  65  * RETURN:      Status
  66  *
  67  * DESCRIPTION: Setup a system_memory operation region
  68  *
  69  ******************************************************************************/
  70
  71 acpi_status
  72 acpi_ev_system_memory_region_setup(acpi_handle handle,
  73                                    u32 function,
  74                                    void *handler_context, void **region_context)
  75 {
  76         union acpi_operand_object *region_desc =
  77             (union acpi_operand_object *)handle;
  78         struct acpi_mem_space_context *local_region_context;
  79
  80         ACPI_FUNCTION_TRACE(ev_system_memory_region_setup);
  81
  82         if (function == ACPI_REGION_DEACTIVATE) {
  83                 if (*region_context) {
  84                         local_region_context =
  85                             (struct acpi_mem_space_context *)*region_context;
  86
  87                         /* Delete a cached mapping if present */
  88
  89                         if (local_region_context->mapped_length) {
  90                                 acpi_os_unmap_memory(local_region_context->
  91                                                      mapped_logical_address,
  92                                                      local_region_context->
  93                                                      mapped_length);
  94                         }
  95                         ACPI_FREE(local_region_context);
  96                         *region_context = NULL;
  97                 }
  98                 return_ACPI_STATUS(AE_OK);
  99         }
 100
 101         /* Create a new context */
 102
 103         local_region_context =
 104             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_mem_space_context));
 105         if (!(local_region_context)) {
 106                 return_ACPI_STATUS(AE_NO_MEMORY);
 107         }
 108
 109         /* Save the region length and address for use in the handler */
 110
 111         local_region_context->length = region_desc->region.length;
 112         local_region_context->address = region_desc->region.address;
 113
 114         *region_context = local_region_context;
 115         return_ACPI_STATUS(AE_OK);
 116 }
 117
 118 /*******************************************************************************
 119  *
 120  * FUNCTION:    acpi_ev_io_space_region_setup
 121  *
 122  * PARAMETERS:  Handle              - Region we are interested in
 123  *              Function            - Start or stop
 124  *              handler_context     - Address space handler context
 125  *              region_context      - Region specific context
 126  *
 127  * RETURN:      Status
 128  *
 129  * DESCRIPTION: Setup a IO operation region
 130  *
 131  ******************************************************************************/
 132
 133 acpi_status
 134 acpi_ev_io_space_region_setup(acpi_handle handle,
 135                               u32 function,
 136                               void *handler_context, void **region_context)
 137 {
 138         ACPI_FUNCTION_TRACE(ev_io_space_region_setup);
 139
 140         if (function == ACPI_REGION_DEACTIVATE) {
 141                 *region_context = NULL;
 142         } else {
 143                 *region_context = handler_context;
 144         }
 145
 146         return_ACPI_STATUS(AE_OK);
 147 }
 148
 149 /*******************************************************************************
 150  *
 151  * FUNCTION:    acpi_ev_pci_config_region_setup
 152  *
 153  * PARAMETERS:  Handle              - Region we are interested in
 154  *              Function            - Start or stop
 155  *              handler_context     - Address space handler context
 156  *              region_context      - Region specific context
 157  *
 158  * RETURN:      Status
 159  *
 160  * DESCRIPTION: Setup a PCI_Config operation region
 161  *
 162  * MUTEX:       Assumes namespace is not locked
 163  *
 164  ******************************************************************************/
 165
 166 acpi_status
 167 acpi_ev_pci_config_region_setup(acpi_handle handle,
 168                                 u32 function,
 169                                 void *handler_context, void **region_context)
 170 {
 171         acpi_status status = AE_OK;
 172         acpi_integer pci_value;
 173         struct acpi_pci_id *pci_id = *region_context;
 174         union acpi_operand_object *handler_obj;
 175         struct acpi_namespace_node *parent_node;
 176         struct acpi_namespace_node *pci_root_node;
 177         struct acpi_namespace_node *pci_device_node;
 178         union acpi_operand_object *region_obj =
 179             (union acpi_operand_object *)handle;
 180
 181         ACPI_FUNCTION_TRACE(ev_pci_config_region_setup);
 182
 183         handler_obj = region_obj->region.handler;
 184         if (!handler_obj) {
 185                 /*
 186                  * No installed handler. This shouldn't happen because the dispatch
 187                  * routine checks before we get here, but we check again just in case.
 188                  */
 189                 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 190                                   "Attempting to init a region %p, with no handler\n",
 191                                   region_obj));
 192                 return_ACPI_STATUS(AE_NOT_EXIST);
 193         }
 194
 195         *region_context = NULL;
 196         if (function == ACPI_REGION_DEACTIVATE) {
 197                 if (pci_id) {
 198                         ACPI_FREE(pci_id);
 199                 }
 200                 return_ACPI_STATUS(status);
 201         }
 202
 203         parent_node = acpi_ns_get_parent_node(region_obj->region.node);
 204
 205         /*
 206          * Get the _SEG and _BBN values from the device upon which the handler
 207          * is installed.
 208          *
 209          * We need to get the _SEG and _BBN objects relative to the PCI BUS device.
 210          * This is the device the handler has been registered to handle.
 211          */
 212
 213         /*
 214          * If the address_space.Node is still pointing to the root, we need
 215          * to scan upward for a PCI Root bridge and re-associate the op_region
 216          * handlers with that device.
 217          */
 218         if (handler_obj->address_space.node == acpi_gbl_root_node) {
 219
 220                 /* Start search from the parent object */
 221
 222                 pci_root_node = parent_node;
 223                 while (pci_root_node != acpi_gbl_root_node) {
 224
 225                         /* Get the _HID/_CID in order to detect a root_bridge */
 226
 227                         if (acpi_ev_is_pci_root_bridge(pci_root_node)) {
 228
 229                                 /* Install a handler for this PCI root bridge */
 230
 231                                 status =
 232                                     acpi_install_address_space_handler((acpi_handle) pci_root_node, ACPI_ADR_SPACE_PCI_CONFIG, ACPI_DEFAULT_HANDLER, NULL, NULL);
 233                                 if (ACPI_FAILURE(status)) {
 234                                         if (status == AE_SAME_HANDLER) {
 235                                                 /*
 236                                                  * It is OK if the handler is already installed on the root
 237                                                  * bridge.  Still need to return a context object for the
 238                                                  * new PCI_Config operation region, however.
 239                                                  */
 240                                                 status = AE_OK;
 241                                         } else {
 242                                                 ACPI_EXCEPTION((AE_INFO, status,
 243                                                                 "Could not install PciConfig handler 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 = acpi_ns_get_parent_node(pci_root_node);
 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,
 276          * device and 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 = acpi_ns_get_parent_node(pci_device_node);
 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 =
 296             acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, pci_device_node,
 297                                             &pci_value);
 298
 299         /*
 300          * The default is zero, and since the allocation above zeroed
 301          * the data, just do nothing on failure.
 302          */
 303         if (ACPI_SUCCESS(status)) {
 304                 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(pci_value));
 305                 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(pci_value));
 306         }
 307
 308         /* The PCI segment number comes from the _SEG method */
 309
 310         status =
 311             acpi_ut_evaluate_numeric_object(METHOD_NAME__SEG, pci_root_node,
 312                                             &pci_value);
 313         if (ACPI_SUCCESS(status)) {
 314                 pci_id->segment = ACPI_LOWORD(pci_value);
 315         }
 316
 317         /* The PCI bus number comes from the _BBN method */
 318
 319         status =
 320             acpi_ut_evaluate_numeric_object(METHOD_NAME__BBN, pci_root_node,
 321                                             &pci_value);
 322         if (ACPI_SUCCESS(status)) {
 323                 pci_id->bus = ACPI_LOWORD(pci_value);
 324         }
 325
 326         /* Complete this device's pci_id */
 327
 328         acpi_os_derive_pci_id(pci_root_node, region_obj->region.node, &pci_id);
 329
 330         *region_context = pci_id;
 331         return_ACPI_STATUS(AE_OK);
 332 }
 333
 334 /*******************************************************************************
 335  *
 336  * FUNCTION:    acpi_ev_match_pci_root_bridge
 337  *
 338  * PARAMETERS:  Id              - The HID/CID in string format
 339  *
 340  * RETURN:      TRUE if the Id is a match for a PCI/PCI-Express Root Bridge
 341  *
 342  * DESCRIPTION: Determine if the input ID is a PCI Root Bridge ID.
 343  *
 344  ******************************************************************************/
 345
 346 static u8 acpi_ev_match_pci_root_bridge(char *id)
 347 {
 348
 349         /*
 350          * Check if this is a PCI root.
 351          * ACPI 3.0+: check for a PCI Express root also.
 352          */
 353         if (!(ACPI_STRNCMP(id,
 354                            PCI_ROOT_HID_STRING,
 355                            sizeof(PCI_ROOT_HID_STRING))) ||
 356             !(ACPI_STRNCMP(id,
 357                            PCI_EXPRESS_ROOT_HID_STRING,
 358                            sizeof(PCI_EXPRESS_ROOT_HID_STRING)))) {
 359                 return (TRUE);
 360         }
 361
 362         return (FALSE);
 363 }
 364
 365 /*******************************************************************************
 366  *
 367  * FUNCTION:    acpi_ev_is_pci_root_bridge
 368  *
 369  * PARAMETERS:  Node            - Device node being examined
 370  *
 371  * RETURN:      TRUE if device is a PCI/PCI-Express Root Bridge
 372  *
 373  * DESCRIPTION: Determine if the input device represents a PCI Root Bridge by
 374  *              examining the _HID and _CID for the device.
 375  *
 376  ******************************************************************************/
 377
 378 static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node)
 379 {
 380         acpi_status status;
 381         struct acpica_device_id hid;
 382         struct acpi_compatible_id_list *cid;
 383         acpi_native_uint i;
 384
 385         /*
 386          * Get the _HID and check for a PCI Root Bridge
 387          */
 388         status = acpi_ut_execute_HID(node, &hid);
 389         if (ACPI_FAILURE(status)) {
 390                 return (FALSE);
 391         }
 392
 393         if (acpi_ev_match_pci_root_bridge(hid.value)) {
 394                 return (TRUE);
 395         }
 396
 397         /*
 398          * The _HID did not match.
 399          * Get the _CID and check for a PCI Root Bridge
 400          */
 401         status = acpi_ut_execute_CID(node, &cid);
 402         if (ACPI_FAILURE(status)) {
 403                 return (FALSE);
 404         }
 405
 406         /* Check all _CIDs in the returned list */
 407
 408         for (i = 0; i < cid->count; i++) {
 409                 if (acpi_ev_match_pci_root_bridge(cid->id[i].value)) {
 410                         ACPI_FREE(cid);
 411                         return (TRUE);
 412                 }
 413         }
 414
 415         ACPI_FREE(cid);
 416         return (FALSE);
 417 }
 418
 419 /*******************************************************************************
 420  *
 421  * FUNCTION:    acpi_ev_pci_bar_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 pci_bAR operation region
 431  *
 432  * MUTEX:       Assumes namespace is not locked
 433  *
 434  ******************************************************************************/
 435
 436 acpi_status
 437 acpi_ev_pci_bar_region_setup(acpi_handle handle,
 438                              u32 function,
 439                              void *handler_context, void **region_context)
 440 {
 441         ACPI_FUNCTION_TRACE(ev_pci_bar_region_setup);
 442
 443         return_ACPI_STATUS(AE_OK);
 444 }
 445
 446 /*******************************************************************************
 447  *
 448  * FUNCTION:    acpi_ev_cmos_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: Setup a CMOS operation region
 458  *
 459  * MUTEX:       Assumes namespace is not locked
 460  *
 461  ******************************************************************************/
 462
 463 acpi_status
 464 acpi_ev_cmos_region_setup(acpi_handle handle,
 465                           u32 function,
 466                           void *handler_context, void **region_context)
 467 {
 468         ACPI_FUNCTION_TRACE(ev_cmos_region_setup);
 469
 470         return_ACPI_STATUS(AE_OK);
 471 }
 472
 473 /*******************************************************************************
 474  *
 475  * FUNCTION:    acpi_ev_default_region_setup
 476  *
 477  * PARAMETERS:  Handle              - Region we are interested in
 478  *              Function            - Start or stop
 479  *              handler_context     - Address space handler context
 480  *              region_context      - Region specific context
 481  *
 482  * RETURN:      Status
 483  *
 484  * DESCRIPTION: Default region initialization
 485  *
 486  ******************************************************************************/
 487
 488 acpi_status
 489 acpi_ev_default_region_setup(acpi_handle handle,
 490                              u32 function,
 491                              void *handler_context, void **region_context)
 492 {
 493         ACPI_FUNCTION_TRACE(ev_default_region_setup);
 494
 495         if (function == ACPI_REGION_DEACTIVATE) {
 496                 *region_context = NULL;
 497         } else {
 498                 *region_context = handler_context;
 499         }
 500
 501         return_ACPI_STATUS(AE_OK);
 502 }
 503
 504 /*******************************************************************************
 505  *
 506  * FUNCTION:    acpi_ev_initialize_region
 507  *
 508  * PARAMETERS:  region_obj      - Region we are initializing
 509  *              acpi_ns_locked  - Is namespace locked?
 510  *
 511  * RETURN:      Status
 512  *
 513  * DESCRIPTION: Initializes the region, finds any _REG methods and saves them
 514  *              for execution at a later time
 515  *
 516  *              Get the appropriate address space handler for a newly
 517  *              created region.
 518  *
 519  *              This also performs address space specific initialization.  For
 520  *              example, PCI regions must have an _ADR object that contains
 521  *              a PCI address in the scope of the definition.  This address is
 522  *              required to perform an access to PCI config space.
 523  *
 524  * MUTEX:       Interpreter should be unlocked, because we may run the _REG
 525  *              method for this region.
 526  *
 527  ******************************************************************************/
 528
 529 acpi_status
 530 acpi_ev_initialize_region(union acpi_operand_object *region_obj,
 531                           u8 acpi_ns_locked)
 532 {
 533         union acpi_operand_object *handler_obj;
 534         union acpi_operand_object *obj_desc;
 535         acpi_adr_space_type space_id;
 536         struct acpi_namespace_node *node;
 537         acpi_status status;
 538         struct acpi_namespace_node *method_node;
 539         acpi_name *reg_name_ptr = (acpi_name *) METHOD_NAME__REG;
 540         union acpi_operand_object *region_obj2;
 541
 542         ACPI_FUNCTION_TRACE_U32(ev_initialize_region, acpi_ns_locked);
 543
 544         if (!region_obj) {
 545                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 546         }
 547
 548         if (region_obj->common.flags & AOPOBJ_OBJECT_INITIALIZED) {
 549                 return_ACPI_STATUS(AE_OK);
 550         }
 551
 552         region_obj2 = acpi_ns_get_secondary_object(region_obj);
 553         if (!region_obj2) {
 554                 return_ACPI_STATUS(AE_NOT_EXIST);
 555         }
 556
 557         node = acpi_ns_get_parent_node(region_obj->region.node);
 558         space_id = region_obj->region.space_id;
 559
 560         /* Setup defaults */
 561
 562         region_obj->region.handler = NULL;
 563         region_obj2->extra.method_REG = NULL;
 564         region_obj->common.flags &= ~(AOPOBJ_SETUP_COMPLETE);
 565         region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED;
 566
 567         /* Find any "_REG" method associated with this region definition */
 568
 569         status =
 570             acpi_ns_search_one_scope(*reg_name_ptr, node, ACPI_TYPE_METHOD,
 571                                      &method_node);
 572         if (ACPI_SUCCESS(status)) {
 573                 /*
 574                  * The _REG method is optional and there can be only one per region
 575                  * definition.  This will be executed when the handler is attached
 576                  * or removed
 577                  */
 578                 region_obj2->extra.method_REG = method_node;
 579         }
 580
 581         /*
 582          * The following loop depends upon the root Node having no parent
 583          * ie: acpi_gbl_root_node->parent_entry being set to NULL
 584          */
 585         while (node) {
 586
 587                 /* Check to see if a handler exists */
 588
 589                 handler_obj = NULL;
 590                 obj_desc = acpi_ns_get_attached_object(node);
 591                 if (obj_desc) {
 592
 593                         /* Can only be a handler if the object exists */
 594
 595                         switch (node->type) {
 596                         case ACPI_TYPE_DEVICE:
 597
 598                                 handler_obj = obj_desc->device.handler;
 599                                 break;
 600
 601                         case ACPI_TYPE_PROCESSOR:
 602
 603                                 handler_obj = obj_desc->processor.handler;
 604                                 break;
 605
 606                         case ACPI_TYPE_THERMAL:
 607
 608                                 handler_obj = obj_desc->thermal_zone.handler;
 609                                 break;
 610
 611                         default:
 612                                 /* Ignore other objects */
 613                                 break;
 614                         }
 615
 616                         while (handler_obj) {
 617
 618                                 /* Is this handler of the correct type? */
 619
 620                                 if (handler_obj->address_space.space_id ==
 621                                     space_id) {
 622
 623                                         /* Found correct handler */
 624
 625                                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 626                                                           "Found handler %p for region %p in obj %p\n",
 627                                                           handler_obj,
 628                                                           region_obj,
 629                                                           obj_desc));
 630
 631                                         status =
 632                                             acpi_ev_attach_region(handler_obj,
 633                                                                   region_obj,
 634                                                                   acpi_ns_locked);
 635
 636                                         /*
 637                                          * Tell all users that this region is usable by running the _REG
 638                                          * method
 639                                          */
 640                                         if (acpi_ns_locked) {
 641                                                 status =
 642                                                     acpi_ut_release_mutex
 643                                                     (ACPI_MTX_NAMESPACE);
 644                                                 if (ACPI_FAILURE(status)) {
 645                                                         return_ACPI_STATUS
 646                                                             (status);
 647                                                 }
 648                                         }
 649
 650                                         status =
 651                                             acpi_ev_execute_reg_method
 652                                             (region_obj, 1);
 653
 654                                         if (acpi_ns_locked) {
 655                                                 status =
 656                                                     acpi_ut_acquire_mutex
 657                                                     (ACPI_MTX_NAMESPACE);
 658                                                 if (ACPI_FAILURE(status)) {
 659                                                         return_ACPI_STATUS
 660                                                             (status);
 661                                                 }
 662                                         }
 663
 664                                         return_ACPI_STATUS(AE_OK);
 665                                 }
 666
 667                                 /* Try next handler in the list */
 668
 669                                 handler_obj = handler_obj->address_space.next;
 670                         }
 671                 }
 672
 673                 /*
 674                  * This node does not have the handler we need;
 675                  * Pop up one level
 676                  */
 677                 node = acpi_ns_get_parent_node(node);
 678         }
 679
 680         /* If we get here, there is no handler for this region */
 681
 682         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 683                           "No handler for RegionType %s(%X) (RegionObj %p)\n",
 684                           acpi_ut_get_region_name(space_id), space_id,
 685                           region_obj));
 686
 687         return_ACPI_STATUS(AE_NOT_EXIST);
 688 }