drivers/acpi/namespace/nsinit.c

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