drivers/acpi/acpica/nsinit.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsinit - namespace initialization
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2018, 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 "acnamesp.h"
  47 #include "acdispat.h"
  48 #include "acinterp.h"
  49 #include "acevents.h"
  50
  51 #define _COMPONENT          ACPI_NAMESPACE
  52 ACPI_MODULE_NAME("nsinit")
  53
  54 /* Local prototypes */
  55 static acpi_status
  56 acpi_ns_init_one_object(acpi_handle obj_handle,
  57                         u32 level, void *context, void **return_value);
  58
  59 static acpi_status
  60 acpi_ns_init_one_device(acpi_handle obj_handle,
  61                         u32 nesting_level, void *context, void **return_value);
  62
  63 static acpi_status
  64 acpi_ns_find_ini_methods(acpi_handle obj_handle,
  65                          u32 nesting_level, void *context, void **return_value);
  66
  67 /*******************************************************************************
  68  *
  69  * FUNCTION:    acpi_ns_initialize_objects
  70  *
  71  * PARAMETERS:  None
  72  *
  73  * RETURN:      Status
  74  *
  75  * DESCRIPTION: Walk the entire namespace and perform any necessary
  76  *              initialization on the objects found therein
  77  *
  78  ******************************************************************************/
  79
  80 acpi_status acpi_ns_initialize_objects(void)
  81 {
  82         acpi_status status;
  83         struct acpi_init_walk_info info;
  84
  85         ACPI_FUNCTION_TRACE(ns_initialize_objects);
  86
  87         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
  88                           "[Init] Completing Initialization of ACPI Objects\n"));
  89         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
  90                           "**** Starting initialization of namespace objects ****\n"));
  91         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
  92                               "Completing Region/Field/Buffer/Package initialization:\n"));
  93
  94         /* Set all init info to zero */
  95
  96         memset(&info, 0, sizeof(struct acpi_init_walk_info));
  97
  98         /* Walk entire namespace from the supplied root */
  99
 100         status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
 101                                      ACPI_UINT32_MAX, acpi_ns_init_one_object,
 102                                      NULL, &info, NULL);
 103         if (ACPI_FAILURE(status)) {
 104                 ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
 105         }
 106
 107         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 108                               "    Initialized %u/%u Regions %u/%u Fields %u/%u "
 109                               "Buffers %u/%u Packages (%u nodes)\n",
 110                               info.op_region_init, info.op_region_count,
 111                               info.field_init, info.field_count,
 112                               info.buffer_init, info.buffer_count,
 113                               info.package_init, info.package_count,
 114                               info.object_count));
 115
 116         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 117                           "%u Control Methods found\n%u Op Regions found\n",
 118                           info.method_count, info.op_region_count));
 119
 120         return_ACPI_STATUS(AE_OK);
 121 }
 122
 123 /*******************************************************************************
 124  *
 125  * FUNCTION:    acpi_ns_initialize_devices
 126  *
 127  * PARAMETERS:  None
 128  *
 129  * RETURN:      acpi_status
 130  *
 131  * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
 132  *              This means running _INI on all present devices.
 133  *
 134  *              Note: We install PCI config space handler on region access,
 135  *              not here.
 136  *
 137  ******************************************************************************/
 138
 139 acpi_status acpi_ns_initialize_devices(u32 flags)
 140 {
 141         acpi_status status = AE_OK;
 142         struct acpi_device_walk_info info;
 143         acpi_handle handle;
 144
 145         ACPI_FUNCTION_TRACE(ns_initialize_devices);
 146
 147         if (!(flags & ACPI_NO_DEVICE_INIT)) {
 148                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 149                                   "[Init] Initializing ACPI Devices\n"));
 150
 151                 /* Init counters */
 152
 153                 info.device_count = 0;
 154                 info.num_STA = 0;
 155                 info.num_INI = 0;
 156
 157                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 158                                       "Initializing Device/Processor/Thermal objects "
 159                                       "and executing _INI/_STA methods:\n"));
 160
 161                 /* Tree analysis: find all subtrees that contain _INI methods */
 162
 163                 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
 164                                                 ACPI_UINT32_MAX, FALSE,
 165                                                 acpi_ns_find_ini_methods, NULL,
 166                                                 &info, NULL);
 167                 if (ACPI_FAILURE(status)) {
 168                         goto error_exit;
 169                 }
 170
 171                 /* Allocate the evaluation information block */
 172
 173                 info.evaluate_info =
 174                     ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 175                 if (!info.evaluate_info) {
 176                         status = AE_NO_MEMORY;
 177                         goto error_exit;
 178                 }
 179
 180                 /*
 181                  * Execute the "global" _INI method that may appear at the root.
 182                  * This support is provided for Windows compatibility (Vista+) and
 183                  * is not part of the ACPI specification.
 184                  */
 185                 info.evaluate_info->prefix_node = acpi_gbl_root_node;
 186                 info.evaluate_info->relative_pathname = METHOD_NAME__INI;
 187                 info.evaluate_info->parameters = NULL;
 188                 info.evaluate_info->flags = ACPI_IGNORE_RETURN_VALUE;
 189
 190                 status = acpi_ns_evaluate(info.evaluate_info);
 191                 if (ACPI_SUCCESS(status)) {
 192                         info.num_INI++;
 193                 }
 194
 195                 /*
 196                  * Execute \_SB._INI.
 197                  * There appears to be a strict order requirement for \_SB._INI,
 198                  * which should be evaluated before any _REG evaluations.
 199                  */
 200                 status = acpi_get_handle(NULL, "\\_SB", &handle);
 201                 if (ACPI_SUCCESS(status)) {
 202                         memset(info.evaluate_info, 0,
 203                                sizeof(struct acpi_evaluate_info));
 204                         info.evaluate_info->prefix_node = handle;
 205                         info.evaluate_info->relative_pathname =
 206                             METHOD_NAME__INI;
 207                         info.evaluate_info->parameters = NULL;
 208                         info.evaluate_info->flags = ACPI_IGNORE_RETURN_VALUE;
 209
 210                         status = acpi_ns_evaluate(info.evaluate_info);
 211                         if (ACPI_SUCCESS(status)) {
 212                                 info.num_INI++;
 213                         }
 214                 }
 215         }
 216
 217         /*
 218          * Run all _REG methods
 219          *
 220          * Note: Any objects accessed by the _REG methods will be automatically
 221          * initialized, even if they contain executable AML (see the call to
 222          * acpi_ns_initialize_objects below).
 223          *
 224          * Note: According to the ACPI specification, we actually needn't execute
 225          * _REG for system_memory/system_io operation regions, but for PCI_Config
 226          * operation regions, it is required to evaluate _REG for those on a PCI
 227          * root bus that doesn't contain _BBN object. So this code is kept here
 228          * in order not to break things.
 229          */
 230         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
 231                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 232                                   "[Init] Executing _REG OpRegion methods\n"));
 233
 234                 status = acpi_ev_initialize_op_regions();
 235                 if (ACPI_FAILURE(status)) {
 236                         goto error_exit;
 237                 }
 238         }
 239
 240         if (!(flags & ACPI_NO_DEVICE_INIT)) {
 241
 242                 /* Walk namespace to execute all _INIs on present devices */
 243
 244                 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
 245                                                 ACPI_UINT32_MAX, FALSE,
 246                                                 acpi_ns_init_one_device, NULL,
 247                                                 &info, NULL);
 248
 249                 /*
 250                  * Any _OSI requests should be completed by now. If the BIOS has
 251                  * requested any Windows OSI strings, we will always truncate
 252                  * I/O addresses to 16 bits -- for Windows compatibility.
 253                  */
 254                 if (acpi_gbl_osi_data >= ACPI_OSI_WIN_2000) {
 255                         acpi_gbl_truncate_io_addresses = TRUE;
 256                 }
 257
 258                 ACPI_FREE(info.evaluate_info);
 259                 if (ACPI_FAILURE(status)) {
 260                         goto error_exit;
 261                 }
 262
 263                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 264                                       "    Executed %u _INI methods requiring %u _STA executions "
 265                                       "(examined %u objects)\n",
 266                                       info.num_INI, info.num_STA,
 267                                       info.device_count));
 268         }
 269
 270         return_ACPI_STATUS(status);
 271
 272 error_exit:
 273         ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
 274         return_ACPI_STATUS(status);
 275 }
 276
 277 /*******************************************************************************
 278  *
 279  * FUNCTION:    acpi_ns_init_one_object
 280  *
 281  * PARAMETERS:  obj_handle      - Node
 282  *              level           - Current nesting level
 283  *              context         - Points to a init info struct
 284  *              return_value    - Not used
 285  *
 286  * RETURN:      Status
 287  *
 288  * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
 289  *              within the  namespace.
 290  *
 291  *              Currently, the only objects that require initialization are:
 292  *              1) Methods
 293  *              2) Op Regions
 294  *
 295  ******************************************************************************/
 296
 297 static acpi_status
 298 acpi_ns_init_one_object(acpi_handle obj_handle,
 299                         u32 level, void *context, void **return_value)
 300 {
 301         acpi_object_type type;
 302         acpi_status status = AE_OK;
 303         struct acpi_init_walk_info *info =
 304             (struct acpi_init_walk_info *)context;
 305         struct acpi_namespace_node *node =
 306             (struct acpi_namespace_node *)obj_handle;
 307         union acpi_operand_object *obj_desc;
 308
 309         ACPI_FUNCTION_NAME(ns_init_one_object);
 310
 311         info->object_count++;
 312
 313         /* And even then, we are only interested in a few object types */
 314
 315         type = acpi_ns_get_type(obj_handle);
 316         obj_desc = acpi_ns_get_attached_object(node);
 317         if (!obj_desc) {
 318                 return (AE_OK);
 319         }
 320
 321         /* Increment counters for object types we are looking for */
 322
 323         switch (type) {
 324         case ACPI_TYPE_REGION:
 325
 326                 info->op_region_count++;
 327                 break;
 328
 329         case ACPI_TYPE_BUFFER_FIELD:
 330
 331                 info->field_count++;
 332                 break;
 333
 334         case ACPI_TYPE_LOCAL_BANK_FIELD:
 335
 336                 info->field_count++;
 337                 break;
 338
 339         case ACPI_TYPE_BUFFER:
 340
 341                 info->buffer_count++;
 342                 break;
 343
 344         case ACPI_TYPE_PACKAGE:
 345
 346                 info->package_count++;
 347                 break;
 348
 349         default:
 350
 351                 /* No init required, just exit now */
 352
 353                 return (AE_OK);
 354         }
 355
 356         /* If the object is already initialized, nothing else to do */
 357
 358         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 359                 return (AE_OK);
 360         }
 361
 362         /* Must lock the interpreter before executing AML code */
 363
 364         acpi_ex_enter_interpreter();
 365
 366         /*
 367          * Each of these types can contain executable AML code within the
 368          * declaration.
 369          */
 370         switch (type) {
 371         case ACPI_TYPE_REGION:
 372
 373                 info->op_region_init++;
 374                 status = acpi_ds_get_region_arguments(obj_desc);
 375                 break;
 376
 377         case ACPI_TYPE_BUFFER_FIELD:
 378
 379                 info->field_init++;
 380                 status = acpi_ds_get_buffer_field_arguments(obj_desc);
 381                 break;
 382
 383         case ACPI_TYPE_LOCAL_BANK_FIELD:
 384
 385                 info->field_init++;
 386                 status = acpi_ds_get_bank_field_arguments(obj_desc);
 387                 break;
 388
 389         case ACPI_TYPE_BUFFER:
 390
 391                 info->buffer_init++;
 392                 status = acpi_ds_get_buffer_arguments(obj_desc);
 393                 break;
 394
 395         case ACPI_TYPE_PACKAGE:
 396
 397                 info->package_init++;
 398                 status = acpi_ds_get_package_arguments(obj_desc);
 399                 if (ACPI_FAILURE(status)) {
 400                         break;
 401                 }
 402
 403                 /*
 404                  * Resolve all named references in package objects (and all
 405                  * sub-packages). This action has been deferred until the entire
 406                  * namespace has been loaded, in order to support external and
 407                  * forward references from individual package elements (05/2017).
 408                  */
 409                 status = acpi_ut_walk_package_tree(obj_desc, NULL,
 410                                                    acpi_ds_init_package_element,
 411                                                    NULL);
 412                 obj_desc->package.flags |= AOPOBJ_DATA_VALID;
 413                 break;
 414
 415         default:
 416
 417                 /* No other types can get here */
 418
 419                 break;
 420         }
 421
 422         if (ACPI_FAILURE(status)) {
 423                 ACPI_EXCEPTION((AE_INFO, status,
 424                                 "Could not execute arguments for [%4.4s] (%s)",
 425                                 acpi_ut_get_node_name(node),
 426                                 acpi_ut_get_type_name(type)));
 427         }
 428
 429         /*
 430          * We ignore errors from above, and always return OK, since we don't want
 431          * to abort the walk on any single error.
 432          */
 433         acpi_ex_exit_interpreter();
 434         return (AE_OK);
 435 }
 436
 437 /*******************************************************************************
 438  *
 439  * FUNCTION:    acpi_ns_find_ini_methods
 440  *
 441  * PARAMETERS:  acpi_walk_callback
 442  *
 443  * RETURN:      acpi_status
 444  *
 445  * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
 446  *              device/processor/thermal objects, and marks the entire subtree
 447  *              with a SUBTREE_HAS_INI flag. This flag is used during the
 448  *              subsequent device initialization walk to avoid entire subtrees
 449  *              that do not contain an _INI.
 450  *
 451  ******************************************************************************/
 452
 453 static acpi_status
 454 acpi_ns_find_ini_methods(acpi_handle obj_handle,
 455                          u32 nesting_level, void *context, void **return_value)
 456 {
 457         struct acpi_device_walk_info *info =
 458             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
 459         struct acpi_namespace_node *node;
 460         struct acpi_namespace_node *parent_node;
 461
 462         /* Keep count of device/processor/thermal objects */
 463
 464         node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
 465         if ((node->type == ACPI_TYPE_DEVICE) ||
 466             (node->type == ACPI_TYPE_PROCESSOR) ||
 467             (node->type == ACPI_TYPE_THERMAL)) {
 468                 info->device_count++;
 469                 return (AE_OK);
 470         }
 471
 472         /* We are only looking for methods named _INI */
 473
 474         if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) {
 475                 return (AE_OK);
 476         }
 477
 478         /*
 479          * The only _INI methods that we care about are those that are
 480          * present under Device, Processor, and Thermal objects.
 481          */
 482         parent_node = node->parent;
 483         switch (parent_node->type) {
 484         case ACPI_TYPE_DEVICE:
 485         case ACPI_TYPE_PROCESSOR:
 486         case ACPI_TYPE_THERMAL:
 487
 488                 /* Mark parent and bubble up the INI present flag to the root */
 489
 490                 while (parent_node) {
 491                         parent_node->flags |= ANOBJ_SUBTREE_HAS_INI;
 492                         parent_node = parent_node->parent;
 493                 }
 494                 break;
 495
 496         default:
 497
 498                 break;
 499         }
 500
 501         return (AE_OK);
 502 }
 503
 504 /*******************************************************************************
 505  *
 506  * FUNCTION:    acpi_ns_init_one_device
 507  *
 508  * PARAMETERS:  acpi_walk_callback
 509  *
 510  * RETURN:      acpi_status
 511  *
 512  * DESCRIPTION: This is called once per device soon after ACPI is enabled
 513  *              to initialize each device. It determines if the device is
 514  *              present, and if so, calls _INI.
 515  *
 516  ******************************************************************************/
 517
 518 static acpi_status
 519 acpi_ns_init_one_device(acpi_handle obj_handle,
 520                         u32 nesting_level, void *context, void **return_value)
 521 {
 522         struct acpi_device_walk_info *walk_info =
 523             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
 524         struct acpi_evaluate_info *info = walk_info->evaluate_info;
 525         u32 flags;
 526         acpi_status status;
 527         struct acpi_namespace_node *device_node;
 528
 529         ACPI_FUNCTION_TRACE(ns_init_one_device);
 530
 531         /* We are interested in Devices, Processors and thermal_zones only */
 532
 533         device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
 534         if ((device_node->type != ACPI_TYPE_DEVICE) &&
 535             (device_node->type != ACPI_TYPE_PROCESSOR) &&
 536             (device_node->type != ACPI_TYPE_THERMAL)) {
 537                 return_ACPI_STATUS(AE_OK);
 538         }
 539
 540         /*
 541          * Because of an earlier namespace analysis, all subtrees that contain an
 542          * _INI method are tagged.
 543          *
 544          * If this device subtree does not contain any _INI methods, we
 545          * can exit now and stop traversing this entire subtree.
 546          */
 547         if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) {
 548                 return_ACPI_STATUS(AE_CTRL_DEPTH);
 549         }
 550
 551         /*
 552          * Run _STA to determine if this device is present and functioning. We
 553          * must know this information for two important reasons (from ACPI spec):
 554          *
 555          * 1) We can only run _INI if the device is present.
 556          * 2) We must abort the device tree walk on this subtree if the device is
 557          *    not present and is not functional (we will not examine the children)
 558          *
 559          * The _STA method is not required to be present under the device, we
 560          * assume the device is present if _STA does not exist.
 561          */
 562         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 563                         (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA));
 564
 565         status = acpi_ut_execute_STA(device_node, &flags);
 566         if (ACPI_FAILURE(status)) {
 567
 568                 /* Ignore error and move on to next device */
 569
 570                 return_ACPI_STATUS(AE_OK);
 571         }
 572
 573         /*
 574          * Flags == -1 means that _STA was not found. In this case, we assume that
 575          * the device is both present and functional.
 576          *
 577          * From the ACPI spec, description of _STA:
 578          *
 579          * "If a device object (including the processor object) does not have an
 580          * _STA object, then OSPM assumes that all of the above bits are set (in
 581          * other words, the device is present, ..., and functioning)"
 582          */
 583         if (flags != ACPI_UINT32_MAX) {
 584                 walk_info->num_STA++;
 585         }
 586
 587         /*
 588          * Examine the PRESENT and FUNCTIONING status bits
 589          *
 590          * Note: ACPI spec does not seem to specify behavior for the present but
 591          * not functioning case, so we assume functioning if present.
 592          */
 593         if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
 594
 595                 /* Device is not present, we must examine the Functioning bit */
 596
 597                 if (flags & ACPI_STA_DEVICE_FUNCTIONING) {
 598                         /*
 599                          * Device is not present but is "functioning". In this case,
 600                          * we will not run _INI, but we continue to examine the children
 601                          * of this device.
 602                          *
 603                          * From the ACPI spec, description of _STA: (note - no mention
 604                          * of whether to run _INI or not on the device in question)
 605                          *
 606                          * "_STA may return bit 0 clear (not present) with bit 3 set
 607                          * (device is functional). This case is used to indicate a valid
 608                          * device for which no device driver should be loaded (for example,
 609                          * a bridge device.) Children of this device may be present and
 610                          * valid. OSPM should continue enumeration below a device whose
 611                          * _STA returns this bit combination"
 612                          */
 613                         return_ACPI_STATUS(AE_OK);
 614                 } else {
 615                         /*
 616                          * Device is not present and is not functioning. We must abort the
 617                          * walk of this subtree immediately -- don't look at the children
 618                          * of such a device.
 619                          *
 620                          * From the ACPI spec, description of _INI:
 621                          *
 622                          * "If the _STA method indicates that the device is not present,
 623                          * OSPM will not run the _INI and will not examine the children
 624                          * of the device for _INI methods"
 625                          */
 626                         return_ACPI_STATUS(AE_CTRL_DEPTH);
 627                 }
 628         }
 629
 630         /*
 631          * The device is present or is assumed present if no _STA exists.
 632          * Run the _INI if it exists (not required to exist)
 633          *
 634          * Note: We know there is an _INI within this subtree, but it may not be
 635          * under this particular device, it may be lower in the branch.
 636          */
 637         if (!ACPI_COMPARE_NAME(device_node->name.ascii, "_SB_") ||
 638             device_node->parent != acpi_gbl_root_node) {
 639                 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 640                                 (ACPI_TYPE_METHOD, device_node,
 641                                  METHOD_NAME__INI));
 642
 643                 memset(info, 0, sizeof(struct acpi_evaluate_info));
 644                 info->prefix_node = device_node;
 645                 info->relative_pathname = METHOD_NAME__INI;
 646                 info->parameters = NULL;
 647                 info->flags = ACPI_IGNORE_RETURN_VALUE;
 648
 649                 status = acpi_ns_evaluate(info);
 650                 if (ACPI_SUCCESS(status)) {
 651                         walk_info->num_INI++;
 652                 }
 653 #ifdef ACPI_DEBUG_OUTPUT
 654                 else if (status != AE_NOT_FOUND) {
 655
 656                         /* Ignore error and move on to next device */
 657
 658                         char *scope_name =
 659                             acpi_ns_get_normalized_pathname(device_node, TRUE);
 660
 661                         ACPI_EXCEPTION((AE_INFO, status,
 662                                         "during %s._INI execution",
 663                                         scope_name));
 664                         ACPI_FREE(scope_name);
 665                 }
 666 #endif
 667         }
 668
 669         /* Ignore errors from above */
 670
 671         status = AE_OK;
 672
 673         /*
 674          * The _INI method has been run if present; call the Global Initialization
 675          * Handler for this device.
 676          */
 677         if (acpi_gbl_init_handler) {
 678                 status =
 679                     acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI);
 680         }
 681
 682         return_ACPI_STATUS(status);
 683 }