drivers/acpi/acpica/nsinit.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsinit - namespace initialization
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2012, 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 <linux/nmi.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_DISPATCH,
  88                           "**** Starting initialization of namespace objects ****\n"));
  89         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
  90                               "Completing Region/Field/Buffer/Package initialization:"));
  91
  92         /* Set all init info to zero */
  93
  94         ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info));
  95
  96         /* Walk entire namespace from the supplied root */
  97
  98         status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
  99                                      ACPI_UINT32_MAX, acpi_ns_init_one_object, NULL,
 100                                      &info, NULL);
 101         if (ACPI_FAILURE(status)) {
 102                 ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
 103         }
 104
 105         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 106                               "\nInitialized %u/%u Regions %u/%u Fields %u/%u "
 107                               "Buffers %u/%u Packages (%u nodes)\n",
 108                               info.op_region_init, info.op_region_count,
 109                               info.field_init, info.field_count,
 110                               info.buffer_init, info.buffer_count,
 111                               info.package_init, info.package_count,
 112                               info.object_count));
 113
 114         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 115                           "%u Control Methods found\n", info.method_count));
 116         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 117                           "%u Op Regions found\n", info.op_region_count));
 118
 119         return_ACPI_STATUS(AE_OK);
 120 }
 121
 122 /*******************************************************************************
 123  *
 124  * FUNCTION:    acpi_ns_initialize_devices
 125  *
 126  * PARAMETERS:  None
 127  *
 128  * RETURN:      acpi_status
 129  *
 130  * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
 131  *              This means running _INI on all present devices.
 132  *
 133  *              Note: We install PCI config space handler on region access,
 134  *              not here.
 135  *
 136  ******************************************************************************/
 137
 138 acpi_status acpi_ns_initialize_devices(void)
 139 {
 140         acpi_status status;
 141         struct acpi_device_walk_info info;
 142
 143         ACPI_FUNCTION_TRACE(ns_initialize_devices);
 144
 145         /* Init counters */
 146
 147         info.device_count = 0;
 148         info.num_STA = 0;
 149         info.num_INI = 0;
 150
 151         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 152                               "Initializing Device/Processor/Thermal objects "
 153                               "by executing _INI methods:"));
 154
 155         /* Tree analysis: find all subtrees that contain _INI methods */
 156
 157         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
 158                                         ACPI_UINT32_MAX, FALSE,
 159                                         acpi_ns_find_ini_methods, NULL, &info,
 160                                         NULL);
 161         if (ACPI_FAILURE(status)) {
 162                 goto error_exit;
 163         }
 164
 165         /* Allocate the evaluation information block */
 166
 167         info.evaluate_info =
 168             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 169         if (!info.evaluate_info) {
 170                 status = AE_NO_MEMORY;
 171                 goto error_exit;
 172         }
 173
 174         /*
 175          * Execute the "global" _INI method that may appear at the root. This
 176          * support is provided for Windows compatibility (Vista+) and is not
 177          * part of the ACPI specification.
 178          */
 179         info.evaluate_info->prefix_node = acpi_gbl_root_node;
 180         info.evaluate_info->pathname = METHOD_NAME__INI;
 181         info.evaluate_info->parameters = NULL;
 182         info.evaluate_info->flags = ACPI_IGNORE_RETURN_VALUE;
 183
 184         status = acpi_ns_evaluate(info.evaluate_info);
 185         if (ACPI_SUCCESS(status)) {
 186                 info.num_INI++;
 187         }
 188
 189         /* Walk namespace to execute all _INIs on present devices */
 190
 191         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
 192                                         ACPI_UINT32_MAX, FALSE,
 193                                         acpi_ns_init_one_device, NULL, &info,
 194                                         NULL);
 195
 196         /*
 197          * Any _OSI requests should be completed by now. If the BIOS has
 198          * requested any Windows OSI strings, we will always truncate
 199          * I/O addresses to 16 bits -- for Windows compatibility.
 200          */
 201         if (acpi_gbl_osi_data >= ACPI_OSI_WIN_2000) {
 202                 acpi_gbl_truncate_io_addresses = TRUE;
 203         }
 204
 205         ACPI_FREE(info.evaluate_info);
 206         if (ACPI_FAILURE(status)) {
 207                 goto error_exit;
 208         }
 209
 210         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 211                               "\nExecuted %u _INI methods requiring %u _STA executions "
 212                               "(examined %u objects)\n",
 213                               info.num_INI, info.num_STA, info.device_count));
 214
 215         return_ACPI_STATUS(status);
 216
 217       error_exit:
 218         ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
 219         return_ACPI_STATUS(status);
 220 }
 221
 222 /*******************************************************************************
 223  *
 224  * FUNCTION:    acpi_ns_init_one_object
 225  *
 226  * PARAMETERS:  obj_handle      - Node
 227  *              Level           - Current nesting level
 228  *              Context         - Points to a init info struct
 229  *              return_value    - Not used
 230  *
 231  * RETURN:      Status
 232  *
 233  * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
 234  *              within the  namespace.
 235  *
 236  *              Currently, the only objects that require initialization are:
 237  *              1) Methods
 238  *              2) Op Regions
 239  *
 240  ******************************************************************************/
 241
 242 static acpi_status
 243 acpi_ns_init_one_object(acpi_handle obj_handle,
 244                         u32 level, void *context, void **return_value)
 245 {
 246         acpi_object_type type;
 247         acpi_status status = AE_OK;
 248         struct acpi_init_walk_info *info =
 249             (struct acpi_init_walk_info *)context;
 250         struct acpi_namespace_node *node =
 251             (struct acpi_namespace_node *)obj_handle;
 252         union acpi_operand_object *obj_desc;
 253
 254         ACPI_FUNCTION_NAME(ns_init_one_object);
 255
 256         info->object_count++;
 257
 258         /* And even then, we are only interested in a few object types */
 259
 260         type = acpi_ns_get_type(obj_handle);
 261         obj_desc = acpi_ns_get_attached_object(node);
 262         if (!obj_desc) {
 263                 return (AE_OK);
 264         }
 265
 266         /* Increment counters for object types we are looking for */
 267
 268         switch (type) {
 269         case ACPI_TYPE_REGION:
 270                 info->op_region_count++;
 271                 break;
 272
 273         case ACPI_TYPE_BUFFER_FIELD:
 274                 info->field_count++;
 275                 break;
 276
 277         case ACPI_TYPE_LOCAL_BANK_FIELD:
 278                 info->field_count++;
 279                 break;
 280
 281         case ACPI_TYPE_BUFFER:
 282                 info->buffer_count++;
 283                 break;
 284
 285         case ACPI_TYPE_PACKAGE:
 286                 info->package_count++;
 287                 break;
 288
 289         default:
 290
 291                 /* No init required, just exit now */
 292                 return (AE_OK);
 293         }
 294
 295         /* If the object is already initialized, nothing else to do */
 296
 297         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 298                 return (AE_OK);
 299         }
 300
 301         /* Must lock the interpreter before executing AML code */
 302
 303         acpi_ex_enter_interpreter();
 304
 305         /*
 306          * Each of these types can contain executable AML code within the
 307          * declaration.
 308          */
 309         switch (type) {
 310         case ACPI_TYPE_REGION:
 311
 312                 info->op_region_init++;
 313                 status = acpi_ds_get_region_arguments(obj_desc);
 314                 break;
 315
 316         case ACPI_TYPE_BUFFER_FIELD:
 317
 318                 info->field_init++;
 319                 status = acpi_ds_get_buffer_field_arguments(obj_desc);
 320                 break;
 321
 322         case ACPI_TYPE_LOCAL_BANK_FIELD:
 323
 324                 info->field_init++;
 325                 status = acpi_ds_get_bank_field_arguments(obj_desc);
 326                 break;
 327
 328         case ACPI_TYPE_BUFFER:
 329
 330                 info->buffer_init++;
 331                 status = acpi_ds_get_buffer_arguments(obj_desc);
 332                 break;
 333
 334         case ACPI_TYPE_PACKAGE:
 335
 336                 info->package_init++;
 337                 status = acpi_ds_get_package_arguments(obj_desc);
 338                 break;
 339
 340         default:
 341                 /* No other types can get here */
 342                 break;
 343         }
 344
 345         if (ACPI_FAILURE(status)) {
 346                 ACPI_EXCEPTION((AE_INFO, status,
 347                                 "Could not execute arguments for [%4.4s] (%s)",
 348                                 acpi_ut_get_node_name(node),
 349                                 acpi_ut_get_type_name(type)));
 350         }
 351
 352         /*
 353          * Print a dot for each object unless we are going to print the entire
 354          * pathname
 355          */
 356         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
 357                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
 358         }
 359
 360         /*
 361          * We ignore errors from above, and always return OK, since we don't want
 362          * to abort the walk on any single error.
 363          */
 364         acpi_ex_exit_interpreter();
 365         return (AE_OK);
 366 }
 367
 368 /*******************************************************************************
 369  *
 370  * FUNCTION:    acpi_ns_find_ini_methods
 371  *
 372  * PARAMETERS:  acpi_walk_callback
 373  *
 374  * RETURN:      acpi_status
 375  *
 376  * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
 377  *              device/processor/thermal objects, and marks the entire subtree
 378  *              with a SUBTREE_HAS_INI flag. This flag is used during the
 379  *              subsequent device initialization walk to avoid entire subtrees
 380  *              that do not contain an _INI.
 381  *
 382  ******************************************************************************/
 383
 384 static acpi_status
 385 acpi_ns_find_ini_methods(acpi_handle obj_handle,
 386                          u32 nesting_level, void *context, void **return_value)
 387 {
 388         struct acpi_device_walk_info *info =
 389             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
 390         struct acpi_namespace_node *node;
 391         struct acpi_namespace_node *parent_node;
 392
 393         /* Keep count of device/processor/thermal objects */
 394
 395         node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
 396         if ((node->type == ACPI_TYPE_DEVICE) ||
 397             (node->type == ACPI_TYPE_PROCESSOR) ||
 398             (node->type == ACPI_TYPE_THERMAL)) {
 399                 info->device_count++;
 400                 return (AE_OK);
 401         }
 402
 403         /* We are only looking for methods named _INI */
 404
 405         if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) {
 406                 return (AE_OK);
 407         }
 408
 409         /*
 410          * The only _INI methods that we care about are those that are
 411          * present under Device, Processor, and Thermal objects.
 412          */
 413         parent_node = node->parent;
 414         switch (parent_node->type) {
 415         case ACPI_TYPE_DEVICE:
 416         case ACPI_TYPE_PROCESSOR:
 417         case ACPI_TYPE_THERMAL:
 418
 419                 /* Mark parent and bubble up the INI present flag to the root */
 420
 421                 while (parent_node) {
 422                         parent_node->flags |= ANOBJ_SUBTREE_HAS_INI;
 423                         parent_node = parent_node->parent;
 424                 }
 425                 break;
 426
 427         default:
 428                 break;
 429         }
 430
 431         return (AE_OK);
 432 }
 433
 434 /*******************************************************************************
 435  *
 436  * FUNCTION:    acpi_ns_init_one_device
 437  *
 438  * PARAMETERS:  acpi_walk_callback
 439  *
 440  * RETURN:      acpi_status
 441  *
 442  * DESCRIPTION: This is called once per device soon after ACPI is enabled
 443  *              to initialize each device. It determines if the device is
 444  *              present, and if so, calls _INI.
 445  *
 446  ******************************************************************************/
 447
 448 static acpi_status
 449 acpi_ns_init_one_device(acpi_handle obj_handle,
 450                         u32 nesting_level, void *context, void **return_value)
 451 {
 452         struct acpi_device_walk_info *walk_info =
 453             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
 454         struct acpi_evaluate_info *info = walk_info->evaluate_info;
 455         u32 flags;
 456         acpi_status status;
 457         struct acpi_namespace_node *device_node;
 458
 459         ACPI_FUNCTION_TRACE(ns_init_one_device);
 460
 461         /* We are interested in Devices, Processors and thermal_zones only */
 462
 463         device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
 464         if ((device_node->type != ACPI_TYPE_DEVICE) &&
 465             (device_node->type != ACPI_TYPE_PROCESSOR) &&
 466             (device_node->type != ACPI_TYPE_THERMAL)) {
 467                 return_ACPI_STATUS(AE_OK);
 468         }
 469
 470         /*
 471          * Because of an earlier namespace analysis, all subtrees that contain an
 472          * _INI method are tagged.
 473          *
 474          * If this device subtree does not contain any _INI methods, we
 475          * can exit now and stop traversing this entire subtree.
 476          */
 477         if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) {
 478                 return_ACPI_STATUS(AE_CTRL_DEPTH);
 479         }
 480
 481         /*
 482          * Run _STA to determine if this device is present and functioning. We
 483          * must know this information for two important reasons (from ACPI spec):
 484          *
 485          * 1) We can only run _INI if the device is present.
 486          * 2) We must abort the device tree walk on this subtree if the device is
 487          *    not present and is not functional (we will not examine the children)
 488          *
 489          * The _STA method is not required to be present under the device, we
 490          * assume the device is present if _STA does not exist.
 491          */
 492         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 493                         (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA));
 494
 495         status = acpi_ut_execute_STA(device_node, &flags);
 496         if (ACPI_FAILURE(status)) {
 497
 498                 /* Ignore error and move on to next device */
 499
 500                 return_ACPI_STATUS(AE_OK);
 501         }
 502
 503         /*
 504          * Flags == -1 means that _STA was not found. In this case, we assume that
 505          * the device is both present and functional.
 506          *
 507          * From the ACPI spec, description of _STA:
 508          *
 509          * "If a device object (including the processor object) does not have an
 510          * _STA object, then OSPM assumes that all of the above bits are set (in
 511          * other words, the device is present, ..., and functioning)"
 512          */
 513         if (flags != ACPI_UINT32_MAX) {
 514                 walk_info->num_STA++;
 515         }
 516
 517         /*
 518          * Examine the PRESENT and FUNCTIONING status bits
 519          *
 520          * Note: ACPI spec does not seem to specify behavior for the present but
 521          * not functioning case, so we assume functioning if present.
 522          */
 523         if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
 524
 525                 /* Device is not present, we must examine the Functioning bit */
 526
 527                 if (flags & ACPI_STA_DEVICE_FUNCTIONING) {
 528                         /*
 529                          * Device is not present but is "functioning". In this case,
 530                          * we will not run _INI, but we continue to examine the children
 531                          * of this device.
 532                          *
 533                          * From the ACPI spec, description of _STA: (Note - no mention
 534                          * of whether to run _INI or not on the device in question)
 535                          *
 536                          * "_STA may return bit 0 clear (not present) with bit 3 set
 537                          * (device is functional). This case is used to indicate a valid
 538                          * device for which no device driver should be loaded (for example,
 539                          * a bridge device.) Children of this device may be present and
 540                          * valid. OSPM should continue enumeration below a device whose
 541                          * _STA returns this bit combination"
 542                          */
 543                         return_ACPI_STATUS(AE_OK);
 544                 } else {
 545                         /*
 546                          * Device is not present and is not functioning. We must abort the
 547                          * walk of this subtree immediately -- don't look at the children
 548                          * of such a device.
 549                          *
 550                          * From the ACPI spec, description of _INI:
 551                          *
 552                          * "If the _STA method indicates that the device is not present,
 553                          * OSPM will not run the _INI and will not examine the children
 554                          * of the device for _INI methods"
 555                          */
 556                         return_ACPI_STATUS(AE_CTRL_DEPTH);
 557                 }
 558         }
 559
 560         /*
 561          * The device is present or is assumed present if no _STA exists.
 562          * Run the _INI if it exists (not required to exist)
 563          *
 564          * Note: We know there is an _INI within this subtree, but it may not be
 565          * under this particular device, it may be lower in the branch.
 566          */
 567         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 568                         (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI));
 569
 570         info->prefix_node = device_node;
 571         info->pathname = METHOD_NAME__INI;
 572         info->parameters = NULL;
 573         info->flags = ACPI_IGNORE_RETURN_VALUE;
 574
 575         /*
 576          * Some hardware relies on this being executed as atomically
 577          * as possible (without an NMI being received in the middle of
 578          * this) - so disable NMIs and initialize the device:
 579          */
 580         status = acpi_ns_evaluate(info);
 581
 582         if (ACPI_SUCCESS(status)) {
 583                 walk_info->num_INI++;
 584
 585                 if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
 586                     (!(acpi_dbg_level & ACPI_LV_INFO))) {
 587                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
 588                 }
 589         }
 590 #ifdef ACPI_DEBUG_OUTPUT
 591         else if (status != AE_NOT_FOUND) {
 592
 593                 /* Ignore error and move on to next device */
 594
 595                 char *scope_name =
 596                     acpi_ns_get_external_pathname(info->resolved_node);
 597
 598                 ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution",
 599                                 scope_name));
 600                 ACPI_FREE(scope_name);
 601         }
 602 #endif
 603
 604         /* Ignore errors from above */
 605
 606         status = AE_OK;
 607
 608         /*
 609          * The _INI method has been run if present; call the Global Initialization
 610          * Handler for this device.
 611          */
 612         if (acpi_gbl_init_handler) {
 613                 status =
 614                     acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI);
 615         }
 616
 617         return_ACPI_STATUS(status);
 618 }