git.oblomov.eu Git - linux-2.6/blob - 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
  49 #define _COMPONENT          ACPI_NAMESPACE
  50 ACPI_MODULE_NAME("nsinit")
  51
  52 /* Local prototypes */
  53 static acpi_status
  54 acpi_ns_init_one_object(acpi_handle obj_handle,
  55                         u32 level, void *context, void **return_value);
  56
  57 static acpi_status
  58 acpi_ns_init_one_device(acpi_handle obj_handle,
  59                         u32 nesting_level, void *context, void **return_value);
  60
  61 static acpi_status
  62 acpi_ns_find_ini_methods(acpi_handle obj_handle,
  63                          u32 nesting_level, void *context, void **return_value);
  64
  65 /*******************************************************************************
  66  *
  67  * FUNCTION:    acpi_ns_initialize_objects
  68  *
  69  * PARAMETERS:  None
  70  *
  71  * RETURN:      Status
  72  *
  73  * DESCRIPTION: Walk the entire namespace and perform any necessary
  74  *              initialization on the objects found therein
  75  *
  76  ******************************************************************************/
  77
  78 acpi_status acpi_ns_initialize_objects(void)
  79 {
  80         acpi_status status;
  81         struct acpi_init_walk_info info;
  82
  83         ACPI_FUNCTION_TRACE(ns_initialize_objects);
  84
  85         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
  86                           "**** Starting initialization of namespace objects ****\n"));
  87         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
  88                               "Completing Region/Field/Buffer/Package initialization:"));
  89
  90         /* Set all init info to zero */
  91
  92         ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info));
  93
  94         /* Walk entire namespace from the supplied root */
  95
  96         status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
  97                                      ACPI_UINT32_MAX, acpi_ns_init_one_object,
  98                                      &info, NULL);
  99         if (ACPI_FAILURE(status)) {
 100                 ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
 101         }
 102
 103         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 104                               "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd Buffers %hd/%hd Packages (%hd nodes)\n",
 105                               info.op_region_init, info.op_region_count,
 106                               info.field_init, info.field_count,
 107                               info.buffer_init, info.buffer_count,
 108                               info.package_init, info.package_count,
 109                               info.object_count));
 110
 111         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 112                           "%hd Control Methods found\n", info.method_count));
 113         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 114                           "%hd Op Regions found\n", info.op_region_count));
 115
 116         return_ACPI_STATUS(AE_OK);
 117 }
 118
 119 /*******************************************************************************
 120  *
 121  * FUNCTION:    acpi_ns_initialize_devices
 122  *
 123  * PARAMETERS:  None
 124  *
 125  * RETURN:      acpi_status
 126  *
 127  * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
 128  *              This means running _INI on all present devices.
 129  *
 130  *              Note: We install PCI config space handler on region access,
 131  *              not here.
 132  *
 133  ******************************************************************************/
 134
 135 acpi_status acpi_ns_initialize_devices(void)
 136 {
 137         acpi_status status;
 138         struct acpi_device_walk_info info;
 139
 140         ACPI_FUNCTION_TRACE(ns_initialize_devices);
 141
 142         /* Init counters */
 143
 144         info.device_count = 0;
 145         info.num_STA = 0;
 146         info.num_INI = 0;
 147
 148         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 149                               "Initializing Device/Processor/Thermal objects by executing _INI methods:"));
 150
 151         /* Tree analysis: find all subtrees that contain _INI methods */
 152
 153         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
 154                                         ACPI_UINT32_MAX, FALSE,
 155                                         acpi_ns_find_ini_methods, &info, NULL);
 156         if (ACPI_FAILURE(status)) {
 157                 goto error_exit;
 158         }
 159
 160         /* Allocate the evaluation information block */
 161
 162         info.evaluate_info =
 163             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 164         if (!info.evaluate_info) {
 165                 status = AE_NO_MEMORY;
 166                 goto error_exit;
 167         }
 168
 169         /* Walk namespace to execute all _INIs on present devices */
 170
 171         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
 172                                         ACPI_UINT32_MAX, FALSE,
 173                                         acpi_ns_init_one_device, &info, NULL);
 174
 175         ACPI_FREE(info.evaluate_info);
 176         if (ACPI_FAILURE(status)) {
 177                 goto error_exit;
 178         }
 179
 180         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 181                               "\nExecuted %hd _INI methods requiring %hd _STA executions (examined %hd objects)\n",
 182                               info.num_INI, info.num_STA, info.device_count));
 183
 184         return_ACPI_STATUS(status);
 185
 186       error_exit:
 187         ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
 188         return_ACPI_STATUS(status);
 189 }
 190
 191 /*******************************************************************************
 192  *
 193  * FUNCTION:    acpi_ns_init_one_object
 194  *
 195  * PARAMETERS:  obj_handle      - Node
 196  *              Level           - Current nesting level
 197  *              Context         - Points to a init info struct
 198  *              return_value    - Not used
 199  *
 200  * RETURN:      Status
 201  *
 202  * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
 203  *              within the  namespace.
 204  *
 205  *              Currently, the only objects that require initialization are:
 206  *              1) Methods
 207  *              2) Op Regions
 208  *
 209  ******************************************************************************/
 210
 211 static acpi_status
 212 acpi_ns_init_one_object(acpi_handle obj_handle,
 213                         u32 level, void *context, void **return_value)
 214 {
 215         acpi_object_type type;
 216         acpi_status status = AE_OK;
 217         struct acpi_init_walk_info *info =
 218             (struct acpi_init_walk_info *)context;
 219         struct acpi_namespace_node *node =
 220             (struct acpi_namespace_node *)obj_handle;
 221         union acpi_operand_object *obj_desc;
 222
 223         ACPI_FUNCTION_NAME(ns_init_one_object);
 224
 225         info->object_count++;
 226
 227         /* And even then, we are only interested in a few object types */
 228
 229         type = acpi_ns_get_type(obj_handle);
 230         obj_desc = acpi_ns_get_attached_object(node);
 231         if (!obj_desc) {
 232                 return (AE_OK);
 233         }
 234
 235         /* Increment counters for object types we are looking for */
 236
 237         switch (type) {
 238         case ACPI_TYPE_REGION:
 239                 info->op_region_count++;
 240                 break;
 241
 242         case ACPI_TYPE_BUFFER_FIELD:
 243                 info->field_count++;
 244                 break;
 245
 246         case ACPI_TYPE_BUFFER:
 247                 info->buffer_count++;
 248                 break;
 249
 250         case ACPI_TYPE_PACKAGE:
 251                 info->package_count++;
 252                 break;
 253
 254         default:
 255
 256                 /* No init required, just exit now */
 257                 return (AE_OK);
 258         }
 259
 260         /*
 261          * If the object is already initialized, nothing else to do
 262          */
 263         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 264                 return (AE_OK);
 265         }
 266
 267         /*
 268          * Must lock the interpreter before executing AML code
 269          */
 270         acpi_ex_enter_interpreter();
 271
 272         /*
 273          * Each of these types can contain executable AML code within the
 274          * declaration.
 275          */
 276         switch (type) {
 277         case ACPI_TYPE_REGION:
 278
 279                 info->op_region_init++;
 280                 status = acpi_ds_get_region_arguments(obj_desc);
 281                 break;
 282
 283         case ACPI_TYPE_BUFFER_FIELD:
 284
 285                 info->field_init++;
 286                 status = acpi_ds_get_buffer_field_arguments(obj_desc);
 287                 break;
 288
 289         case ACPI_TYPE_BUFFER:
 290
 291                 info->buffer_init++;
 292                 status = acpi_ds_get_buffer_arguments(obj_desc);
 293                 break;
 294
 295         case ACPI_TYPE_PACKAGE:
 296
 297                 info->package_init++;
 298                 status = acpi_ds_get_package_arguments(obj_desc);
 299                 break;
 300
 301         default:
 302                 /* No other types can get here */
 303                 break;
 304         }
 305
 306         if (ACPI_FAILURE(status)) {
 307                 ACPI_EXCEPTION((AE_INFO, status,
 308                                 "Could not execute arguments for [%4.4s] (%s)",
 309                                 acpi_ut_get_node_name(node),
 310                                 acpi_ut_get_type_name(type)));
 311         }
 312
 313         /*
 314          * Print a dot for each object unless we are going to print the entire
 315          * pathname
 316          */
 317         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
 318                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
 319         }
 320
 321         /*
 322          * We ignore errors from above, and always return OK, since we don't want
 323          * to abort the walk on any single error.
 324          */
 325         acpi_ex_exit_interpreter();
 326         return (AE_OK);
 327 }
 328
 329 /*******************************************************************************
 330  *
 331  * FUNCTION:    acpi_ns_find_ini_methods
 332  *
 333  * PARAMETERS:  acpi_walk_callback
 334  *
 335  * RETURN:      acpi_status
 336  *
 337  * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
 338  *              device/processor/thermal objects, and marks the entire subtree
 339  *              with a SUBTREE_HAS_INI flag. This flag is used during the
 340  *              subsequent device initialization walk to avoid entire subtrees
 341  *              that do not contain an _INI.
 342  *
 343  ******************************************************************************/
 344
 345 static acpi_status
 346 acpi_ns_find_ini_methods(acpi_handle obj_handle,
 347                          u32 nesting_level, void *context, void **return_value)
 348 {
 349         struct acpi_device_walk_info *info =
 350             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
 351         struct acpi_namespace_node *node;
 352         struct acpi_namespace_node *parent_node;
 353
 354         /* Keep count of device/processor/thermal objects */
 355
 356         node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
 357         if ((node->type == ACPI_TYPE_DEVICE) ||
 358             (node->type == ACPI_TYPE_PROCESSOR) ||
 359             (node->type == ACPI_TYPE_THERMAL)) {
 360                 info->device_count++;
 361                 return (AE_OK);
 362         }
 363
 364         /* We are only looking for methods named _INI */
 365
 366         if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) {
 367                 return (AE_OK);
 368         }
 369
 370         /*
 371          * The only _INI methods that we care about are those that are
 372          * present under Device, Processor, and Thermal objects.
 373          */
 374         parent_node = acpi_ns_get_parent_node(node);
 375         switch (parent_node->type) {
 376         case ACPI_TYPE_DEVICE:
 377         case ACPI_TYPE_PROCESSOR:
 378         case ACPI_TYPE_THERMAL:
 379
 380                 /* Mark parent and bubble up the INI present flag to the root */
 381
 382                 while (parent_node) {
 383                         parent_node->flags |= ANOBJ_SUBTREE_HAS_INI;
 384                         parent_node = acpi_ns_get_parent_node(parent_node);
 385                 }
 386                 break;
 387
 388         default:
 389                 break;
 390         }
 391
 392         return (AE_OK);
 393 }
 394
 395 /*******************************************************************************
 396  *
 397  * FUNCTION:    acpi_ns_init_one_device
 398  *
 399  * PARAMETERS:  acpi_walk_callback
 400  *
 401  * RETURN:      acpi_status
 402  *
 403  * DESCRIPTION: This is called once per device soon after ACPI is enabled
 404  *              to initialize each device. It determines if the device is
 405  *              present, and if so, calls _INI.
 406  *
 407  ******************************************************************************/
 408
 409 static acpi_status
 410 acpi_ns_init_one_device(acpi_handle obj_handle,
 411                         u32 nesting_level, void *context, void **return_value)
 412 {
 413         struct acpi_device_walk_info *walk_info =
 414             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
 415         struct acpi_evaluate_info *info = walk_info->evaluate_info;
 416         u32 flags;
 417         acpi_status status;
 418         struct acpi_namespace_node *device_node;
 419
 420         ACPI_FUNCTION_TRACE(ns_init_one_device);
 421
 422         /* We are interested in Devices, Processors and thermal_zones only */
 423
 424         device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
 425         if ((device_node->type != ACPI_TYPE_DEVICE) &&
 426             (device_node->type != ACPI_TYPE_PROCESSOR) &&
 427             (device_node->type != ACPI_TYPE_THERMAL)) {
 428                 return_ACPI_STATUS(AE_OK);
 429         }
 430
 431         /*
 432          * Because of an earlier namespace analysis, all subtrees that contain an
 433          * _INI method are tagged.
 434          *
 435          * If this device subtree does not contain any _INI methods, we
 436          * can exit now and stop traversing this entire subtree.
 437          */
 438         if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) {
 439                 return_ACPI_STATUS(AE_CTRL_DEPTH);
 440         }
 441
 442         /*
 443          * Run _STA to determine if this device is present and functioning. We
 444          * must know this information for two important reasons (from ACPI spec):
 445          *
 446          * 1) We can only run _INI if the device is present.
 447          * 2) We must abort the device tree walk on this subtree if the device is
 448          *    not present and is not functional (we will not examine the children)
 449          *
 450          * The _STA method is not required to be present under the device, we
 451          * assume the device is present if _STA does not exist.
 452          */
 453         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 454                         (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA));
 455
 456         status = acpi_ut_execute_STA(device_node, &flags);
 457         if (ACPI_FAILURE(status)) {
 458
 459                 /* Ignore error and move on to next device */
 460
 461                 return_ACPI_STATUS(AE_OK);
 462         }
 463
 464         /*
 465          * Flags == -1 means that _STA was not found. In this case, we assume that
 466          * the device is both present and functional.
 467          *
 468          * From the ACPI spec, description of _STA:
 469          *
 470          * "If a device object (including the processor object) does not have an
 471          * _STA object, then OSPM assumes that all of the above bits are set (in
 472          * other words, the device is present, ..., and functioning)"
 473          */
 474         if (flags != ACPI_UINT32_MAX) {
 475                 walk_info->num_STA++;
 476         }
 477
 478         /*
 479          * Examine the PRESENT and FUNCTIONING status bits
 480          *
 481          * Note: ACPI spec does not seem to specify behavior for the present but
 482          * not functioning case, so we assume functioning if present.
 483          */
 484         if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
 485
 486                 /* Device is not present, we must examine the Functioning bit */
 487
 488                 if (flags & ACPI_STA_DEVICE_FUNCTIONING) {
 489                         /*
 490                          * Device is not present but is "functioning". In this case,
 491                          * we will not run _INI, but we continue to examine the children
 492                          * of this device.
 493                          *
 494                          * From the ACPI spec, description of _STA: (Note - no mention
 495                          * of whether to run _INI or not on the device in question)
 496                          *
 497                          * "_STA may return bit 0 clear (not present) with bit 3 set
 498                          * (device is functional). This case is used to indicate a valid
 499                          * device for which no device driver should be loaded (for example,
 500                          * a bridge device.) Children of this device may be present and
 501                          * valid. OSPM should continue enumeration below a device whose
 502                          * _STA returns this bit combination"
 503                          */
 504                         return_ACPI_STATUS(AE_OK);
 505                 } else {
 506                         /*
 507                          * Device is not present and is not functioning. We must abort the
 508                          * walk of this subtree immediately -- don't look at the children
 509                          * of such a device.
 510                          *
 511                          * From the ACPI spec, description of _INI:
 512                          *
 513                          * "If the _STA method indicates that the device is not present,
 514                          * OSPM will not run the _INI and will not examine the children
 515                          * of the device for _INI methods"
 516                          */
 517                         return_ACPI_STATUS(AE_CTRL_DEPTH);
 518                 }
 519         }
 520
 521         /*
 522          * The device is present or is assumed present if no _STA exists.
 523          * Run the _INI if it exists (not required to exist)
 524          *
 525          * Note: We know there is an _INI within this subtree, but it may not be
 526          * under this particular device, it may be lower in the branch.
 527          */
 528         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 529                         (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI));
 530
 531         info->prefix_node = device_node;
 532         info->pathname = METHOD_NAME__INI;
 533         info->parameters = NULL;
 534         info->parameter_type = ACPI_PARAM_ARGS;
 535         info->flags = ACPI_IGNORE_RETURN_VALUE;
 536
 537         status = acpi_ns_evaluate(info);
 538         if (ACPI_SUCCESS(status)) {
 539                 walk_info->num_INI++;
 540
 541                 if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
 542                     (!(acpi_dbg_level & ACPI_LV_INFO))) {
 543                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
 544                 }
 545         }
 546 #ifdef ACPI_DEBUG_OUTPUT
 547         else if (status != AE_NOT_FOUND) {
 548
 549                 /* Ignore error and move on to next device */
 550
 551                 char *scope_name =
 552                     acpi_ns_get_external_pathname(info->resolved_node);
 553
 554                 ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution",
 555                                 scope_name));
 556                 ACPI_FREE(scope_name);
 557         }
 558 #endif
 559
 560         /* Ignore errors from above */
 561
 562         status = AE_OK;
 563
 564         /*
 565          * The _INI method has been run if present; call the Global Initialization
 566          * Handler for this device.
 567          */
 568         if (acpi_gbl_init_handler) {
 569                 status =
 570                     acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI);
 571         }
 572
 573         return_ACPI_STATUS(status);
 574 }