drivers/acpi/acpica/nsinit.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsinit - namespace initialization
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, 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 %hd/%hd Regions %hd/%hd Fields %hd/%hd "
 107                               "Buffers %hd/%hd Packages (%hd 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                           "%hd Control Methods found\n", info.method_count));
 116         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 117                           "%hd 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         ACPI_FREE(info.evaluate_info);
 197         if (ACPI_FAILURE(status)) {
 198                 goto error_exit;
 199         }
 200
 201         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 202                               "\nExecuted %hd _INI methods requiring %hd _STA executions "
 203                               "(examined %hd objects)\n",
 204                               info.num_INI, info.num_STA, info.device_count));
 205
 206         return_ACPI_STATUS(status);
 207
 208       error_exit:
 209         ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
 210         return_ACPI_STATUS(status);
 211 }
 212
 213 /*******************************************************************************
 214  *
 215  * FUNCTION:    acpi_ns_init_one_object
 216  *
 217  * PARAMETERS:  obj_handle      - Node
 218  *              Level           - Current nesting level
 219  *              Context         - Points to a init info struct
 220  *              return_value    - Not used
 221  *
 222  * RETURN:      Status
 223  *
 224  * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
 225  *              within the  namespace.
 226  *
 227  *              Currently, the only objects that require initialization are:
 228  *              1) Methods
 229  *              2) Op Regions
 230  *
 231  ******************************************************************************/
 232
 233 static acpi_status
 234 acpi_ns_init_one_object(acpi_handle obj_handle,
 235                         u32 level, void *context, void **return_value)
 236 {
 237         acpi_object_type type;
 238         acpi_status status = AE_OK;
 239         struct acpi_init_walk_info *info =
 240             (struct acpi_init_walk_info *)context;
 241         struct acpi_namespace_node *node =
 242             (struct acpi_namespace_node *)obj_handle;
 243         union acpi_operand_object *obj_desc;
 244
 245         ACPI_FUNCTION_NAME(ns_init_one_object);
 246
 247         info->object_count++;
 248
 249         /* And even then, we are only interested in a few object types */
 250
 251         type = acpi_ns_get_type(obj_handle);
 252         obj_desc = acpi_ns_get_attached_object(node);
 253         if (!obj_desc) {
 254                 return (AE_OK);
 255         }
 256
 257         /* Increment counters for object types we are looking for */
 258
 259         switch (type) {
 260         case ACPI_TYPE_REGION:
 261                 info->op_region_count++;
 262                 break;
 263
 264         case ACPI_TYPE_BUFFER_FIELD:
 265                 info->field_count++;
 266                 break;
 267
 268         case ACPI_TYPE_LOCAL_BANK_FIELD:
 269                 info->field_count++;
 270                 break;
 271
 272         case ACPI_TYPE_BUFFER:
 273                 info->buffer_count++;
 274                 break;
 275
 276         case ACPI_TYPE_PACKAGE:
 277                 info->package_count++;
 278                 break;
 279
 280         default:
 281
 282                 /* No init required, just exit now */
 283                 return (AE_OK);
 284         }
 285
 286         /* If the object is already initialized, nothing else to do */
 287
 288         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 289                 return (AE_OK);
 290         }
 291
 292         /* Must lock the interpreter before executing AML code */
 293
 294         acpi_ex_enter_interpreter();
 295
 296         /*
 297          * Each of these types can contain executable AML code within the
 298          * declaration.
 299          */
 300         switch (type) {
 301         case ACPI_TYPE_REGION:
 302
 303                 info->op_region_init++;
 304                 status = acpi_ds_get_region_arguments(obj_desc);
 305                 break;
 306
 307         case ACPI_TYPE_BUFFER_FIELD:
 308
 309                 info->field_init++;
 310                 status = acpi_ds_get_buffer_field_arguments(obj_desc);
 311                 break;
 312
 313         case ACPI_TYPE_LOCAL_BANK_FIELD:
 314
 315                 info->field_init++;
 316                 status = acpi_ds_get_bank_field_arguments(obj_desc);
 317                 break;
 318
 319         case ACPI_TYPE_BUFFER:
 320
 321                 info->buffer_init++;
 322                 status = acpi_ds_get_buffer_arguments(obj_desc);
 323                 break;
 324
 325         case ACPI_TYPE_PACKAGE:
 326
 327                 info->package_init++;
 328                 status = acpi_ds_get_package_arguments(obj_desc);
 329                 break;
 330
 331         default:
 332                 /* No other types can get here */
 333                 break;
 334         }
 335
 336         if (ACPI_FAILURE(status)) {
 337                 ACPI_EXCEPTION((AE_INFO, status,
 338                                 "Could not execute arguments for [%4.4s] (%s)",
 339                                 acpi_ut_get_node_name(node),
 340                                 acpi_ut_get_type_name(type)));
 341         }
 342
 343         /*
 344          * Print a dot for each object unless we are going to print the entire
 345          * pathname
 346          */
 347         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
 348                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
 349         }
 350
 351         /*
 352          * We ignore errors from above, and always return OK, since we don't want
 353          * to abort the walk on any single error.
 354          */
 355         acpi_ex_exit_interpreter();
 356         return (AE_OK);
 357 }
 358
 359 /*******************************************************************************
 360  *
 361  * FUNCTION:    acpi_ns_find_ini_methods
 362  *
 363  * PARAMETERS:  acpi_walk_callback
 364  *
 365  * RETURN:      acpi_status
 366  *
 367  * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
 368  *              device/processor/thermal objects, and marks the entire subtree
 369  *              with a SUBTREE_HAS_INI flag. This flag is used during the
 370  *              subsequent device initialization walk to avoid entire subtrees
 371  *              that do not contain an _INI.
 372  *
 373  ******************************************************************************/
 374
 375 static acpi_status
 376 acpi_ns_find_ini_methods(acpi_handle obj_handle,
 377                          u32 nesting_level, void *context, void **return_value)
 378 {
 379         struct acpi_device_walk_info *info =
 380             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
 381         struct acpi_namespace_node *node;
 382         struct acpi_namespace_node *parent_node;
 383
 384         /* Keep count of device/processor/thermal objects */
 385
 386         node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
 387         if ((node->type == ACPI_TYPE_DEVICE) ||
 388             (node->type == ACPI_TYPE_PROCESSOR) ||
 389             (node->type == ACPI_TYPE_THERMAL)) {
 390                 info->device_count++;
 391                 return (AE_OK);
 392         }
 393
 394         /* We are only looking for methods named _INI */
 395
 396         if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) {
 397                 return (AE_OK);
 398         }
 399
 400         /*
 401          * The only _INI methods that we care about are those that are
 402          * present under Device, Processor, and Thermal objects.
 403          */
 404         parent_node = acpi_ns_get_parent_node(node);
 405         switch (parent_node->type) {
 406         case ACPI_TYPE_DEVICE:
 407         case ACPI_TYPE_PROCESSOR:
 408         case ACPI_TYPE_THERMAL:
 409
 410                 /* Mark parent and bubble up the INI present flag to the root */
 411
 412                 while (parent_node) {
 413                         parent_node->flags |= ANOBJ_SUBTREE_HAS_INI;
 414                         parent_node = acpi_ns_get_parent_node(parent_node);
 415                 }
 416                 break;
 417
 418         default:
 419                 break;
 420         }
 421
 422         return (AE_OK);
 423 }
 424
 425 /*******************************************************************************
 426  *
 427  * FUNCTION:    acpi_ns_init_one_device
 428  *
 429  * PARAMETERS:  acpi_walk_callback
 430  *
 431  * RETURN:      acpi_status
 432  *
 433  * DESCRIPTION: This is called once per device soon after ACPI is enabled
 434  *              to initialize each device. It determines if the device is
 435  *              present, and if so, calls _INI.
 436  *
 437  ******************************************************************************/
 438
 439 static acpi_status
 440 acpi_ns_init_one_device(acpi_handle obj_handle,
 441                         u32 nesting_level, void *context, void **return_value)
 442 {
 443         struct acpi_device_walk_info *walk_info =
 444             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
 445         struct acpi_evaluate_info *info = walk_info->evaluate_info;
 446         u32 flags;
 447         acpi_status status;
 448         struct acpi_namespace_node *device_node;
 449
 450         ACPI_FUNCTION_TRACE(ns_init_one_device);
 451
 452         /* We are interested in Devices, Processors and thermal_zones only */
 453
 454         device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
 455         if ((device_node->type != ACPI_TYPE_DEVICE) &&
 456             (device_node->type != ACPI_TYPE_PROCESSOR) &&
 457             (device_node->type != ACPI_TYPE_THERMAL)) {
 458                 return_ACPI_STATUS(AE_OK);
 459         }
 460
 461         /*
 462          * Because of an earlier namespace analysis, all subtrees that contain an
 463          * _INI method are tagged.
 464          *
 465          * If this device subtree does not contain any _INI methods, we
 466          * can exit now and stop traversing this entire subtree.
 467          */
 468         if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) {
 469                 return_ACPI_STATUS(AE_CTRL_DEPTH);
 470         }
 471
 472         /*
 473          * Run _STA to determine if this device is present and functioning. We
 474          * must know this information for two important reasons (from ACPI spec):
 475          *
 476          * 1) We can only run _INI if the device is present.
 477          * 2) We must abort the device tree walk on this subtree if the device is
 478          *    not present and is not functional (we will not examine the children)
 479          *
 480          * The _STA method is not required to be present under the device, we
 481          * assume the device is present if _STA does not exist.
 482          */
 483         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 484                         (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA));
 485
 486         status = acpi_ut_execute_STA(device_node, &flags);
 487         if (ACPI_FAILURE(status)) {
 488
 489                 /* Ignore error and move on to next device */
 490
 491                 return_ACPI_STATUS(AE_OK);
 492         }
 493
 494         /*
 495          * Flags == -1 means that _STA was not found. In this case, we assume that
 496          * the device is both present and functional.
 497          *
 498          * From the ACPI spec, description of _STA:
 499          *
 500          * "If a device object (including the processor object) does not have an
 501          * _STA object, then OSPM assumes that all of the above bits are set (in
 502          * other words, the device is present, ..., and functioning)"
 503          */
 504         if (flags != ACPI_UINT32_MAX) {
 505                 walk_info->num_STA++;
 506         }
 507
 508         /*
 509          * Examine the PRESENT and FUNCTIONING status bits
 510          *
 511          * Note: ACPI spec does not seem to specify behavior for the present but
 512          * not functioning case, so we assume functioning if present.
 513          */
 514         if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
 515
 516                 /* Device is not present, we must examine the Functioning bit */
 517
 518                 if (flags & ACPI_STA_DEVICE_FUNCTIONING) {
 519                         /*
 520                          * Device is not present but is "functioning". In this case,
 521                          * we will not run _INI, but we continue to examine the children
 522                          * of this device.
 523                          *
 524                          * From the ACPI spec, description of _STA: (Note - no mention
 525                          * of whether to run _INI or not on the device in question)
 526                          *
 527                          * "_STA may return bit 0 clear (not present) with bit 3 set
 528                          * (device is functional). This case is used to indicate a valid
 529                          * device for which no device driver should be loaded (for example,
 530                          * a bridge device.) Children of this device may be present and
 531                          * valid. OSPM should continue enumeration below a device whose
 532                          * _STA returns this bit combination"
 533                          */
 534                         return_ACPI_STATUS(AE_OK);
 535                 } else {
 536                         /*
 537                          * Device is not present and is not functioning. We must abort the
 538                          * walk of this subtree immediately -- don't look at the children
 539                          * of such a device.
 540                          *
 541                          * From the ACPI spec, description of _INI:
 542                          *
 543                          * "If the _STA method indicates that the device is not present,
 544                          * OSPM will not run the _INI and will not examine the children
 545                          * of the device for _INI methods"
 546                          */
 547                         return_ACPI_STATUS(AE_CTRL_DEPTH);
 548                 }
 549         }
 550
 551         /*
 552          * The device is present or is assumed present if no _STA exists.
 553          * Run the _INI if it exists (not required to exist)
 554          *
 555          * Note: We know there is an _INI within this subtree, but it may not be
 556          * under this particular device, it may be lower in the branch.
 557          */
 558         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 559                         (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI));
 560
 561         info->prefix_node = device_node;
 562         info->pathname = METHOD_NAME__INI;
 563         info->parameters = NULL;
 564         info->flags = ACPI_IGNORE_RETURN_VALUE;
 565
 566         /*
 567          * Some hardware relies on this being executed as atomically
 568          * as possible (without an NMI being received in the middle of
 569          * this) - so disable NMIs and initialize the device:
 570          */
 571         acpi_nmi_disable();
 572         status = acpi_ns_evaluate(info);
 573         acpi_nmi_enable();
 574
 575         if (ACPI_SUCCESS(status)) {
 576                 walk_info->num_INI++;
 577
 578                 if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
 579                     (!(acpi_dbg_level & ACPI_LV_INFO))) {
 580                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
 581                 }
 582         }
 583 #ifdef ACPI_DEBUG_OUTPUT
 584         else if (status != AE_NOT_FOUND) {
 585
 586                 /* Ignore error and move on to next device */
 587
 588                 char *scope_name =
 589                     acpi_ns_get_external_pathname(info->resolved_node);
 590
 591                 ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution",
 592                                 scope_name));
 593                 ACPI_FREE(scope_name);
 594         }
 595 #endif
 596
 597         /* Ignore errors from above */
 598
 599         status = AE_OK;
 600
 601         /*
 602          * The _INI method has been run if present; call the Global Initialization
 603          * Handler for this device.
 604          */
 605         if (acpi_gbl_init_handler) {
 606                 status =
 607                     acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI);
 608         }
 609
 610         return_ACPI_STATUS(status);
 611 }