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 - 2005, 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 /*******************************************************************************
  62  *
  63  * FUNCTION:    acpi_ns_initialize_objects
  64  *
  65  * PARAMETERS:  None
  66  *
  67  * RETURN:      Status
  68  *
  69  * DESCRIPTION: Walk the entire namespace and perform any necessary
  70  *              initialization on the objects found therein
  71  *
  72  ******************************************************************************/
  73
  74 acpi_status acpi_ns_initialize_objects(void)
  75 {
  76         acpi_status status;
  77         struct acpi_init_walk_info info;
  78
  79         ACPI_FUNCTION_TRACE("ns_initialize_objects");
  80
  81         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
  82                           "**** Starting initialization of namespace objects ****\n"));
  83         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
  84                               "Completing Region/Field/Buffer/Package initialization:"));
  85
  86         /* Set all init info to zero */
  87
  88         ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info));
  89
  90         /* Walk entire namespace from the supplied root */
  91
  92         status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
  93                                      ACPI_UINT32_MAX, acpi_ns_init_one_object,
  94                                      &info, NULL);
  95         if (ACPI_FAILURE(status)) {
  96                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "walk_namespace failed! %s\n",
  97                                   acpi_format_exception(status)));
  98         }
  99
 100         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 101                               "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd Buffers %hd/%hd Packages (%hd nodes)\n",
 102                               info.op_region_init, info.op_region_count,
 103                               info.field_init, info.field_count,
 104                               info.buffer_init, info.buffer_count,
 105                               info.package_init, info.package_count,
 106                               info.object_count));
 107
 108         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 109                           "%hd Control Methods found\n", info.method_count));
 110         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 111                           "%hd Op Regions found\n", info.op_region_count));
 112
 113         return_ACPI_STATUS(AE_OK);
 114 }
 115
 116 /*******************************************************************************
 117  *
 118  * FUNCTION:    acpi_ns_initialize_devices
 119  *
 120  * PARAMETERS:  None
 121  *
 122  * RETURN:      acpi_status
 123  *
 124  * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
 125  *              This means running _INI on all present devices.
 126  *
 127  *              Note: We install PCI config space handler on region access,
 128  *              not here.
 129  *
 130  ******************************************************************************/
 131
 132 acpi_status acpi_ns_initialize_devices(void)
 133 {
 134         acpi_status status;
 135         struct acpi_device_walk_info info;
 136
 137         ACPI_FUNCTION_TRACE("ns_initialize_devices");
 138
 139         /* Init counters */
 140
 141         info.device_count = 0;
 142         info.num_STA = 0;
 143         info.num_INI = 0;
 144
 145         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 146                               "Executing all Device _STA and_INI methods:"));
 147
 148         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 149         if (ACPI_FAILURE(status)) {
 150                 return_ACPI_STATUS(status);
 151         }
 152
 153         /* Walk namespace for all objects */
 154
 155         status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
 156                                         ACPI_UINT32_MAX, TRUE,
 157                                         acpi_ns_init_one_device, &info, NULL);
 158
 159         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 160
 161         if (ACPI_FAILURE(status)) {
 162                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "walk_namespace failed! %s\n",
 163                                   acpi_format_exception(status)));
 164         }
 165
 166         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 167                               "\n%hd Devices found containing: %hd _STA, %hd _INI methods\n",
 168                               info.device_count, info.num_STA, info.num_INI));
 169
 170         return_ACPI_STATUS(status);
 171 }
 172
 173 /*******************************************************************************
 174  *
 175  * FUNCTION:    acpi_ns_init_one_object
 176  *
 177  * PARAMETERS:  obj_handle      - Node
 178  *              Level           - Current nesting level
 179  *              Context         - Points to a init info struct
 180  *              return_value    - Not used
 181  *
 182  * RETURN:      Status
 183  *
 184  * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
 185  *              within the  namespace.
 186  *
 187  *              Currently, the only objects that require initialization are:
 188  *              1) Methods
 189  *              2) Op Regions
 190  *
 191  ******************************************************************************/
 192
 193 static acpi_status
 194 acpi_ns_init_one_object(acpi_handle obj_handle,
 195                         u32 level, void *context, void **return_value)
 196 {
 197         acpi_object_type type;
 198         acpi_status status;
 199         struct acpi_init_walk_info *info =
 200             (struct acpi_init_walk_info *)context;
 201         struct acpi_namespace_node *node =
 202             (struct acpi_namespace_node *)obj_handle;
 203         union acpi_operand_object *obj_desc;
 204
 205         ACPI_FUNCTION_NAME("ns_init_one_object");
 206
 207         info->object_count++;
 208
 209         /* And even then, we are only interested in a few object types */
 210
 211         type = acpi_ns_get_type(obj_handle);
 212         obj_desc = acpi_ns_get_attached_object(node);
 213         if (!obj_desc) {
 214                 return (AE_OK);
 215         }
 216
 217         /* Increment counters for object types we are looking for */
 218
 219         switch (type) {
 220         case ACPI_TYPE_REGION:
 221                 info->op_region_count++;
 222                 break;
 223
 224         case ACPI_TYPE_BUFFER_FIELD:
 225                 info->field_count++;
 226                 break;
 227
 228         case ACPI_TYPE_BUFFER:
 229                 info->buffer_count++;
 230                 break;
 231
 232         case ACPI_TYPE_PACKAGE:
 233                 info->package_count++;
 234                 break;
 235
 236         default:
 237
 238                 /* No init required, just exit now */
 239                 return (AE_OK);
 240         }
 241
 242         /*
 243          * If the object is already initialized, nothing else to do
 244          */
 245         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 246                 return (AE_OK);
 247         }
 248
 249         /*
 250          * Must lock the interpreter before executing AML code
 251          */
 252         status = acpi_ex_enter_interpreter();
 253         if (ACPI_FAILURE(status)) {
 254                 return (status);
 255         }
 256
 257         /*
 258          * Each of these types can contain executable AML code within the
 259          * declaration.
 260          */
 261         switch (type) {
 262         case ACPI_TYPE_REGION:
 263
 264                 info->op_region_init++;
 265                 status = acpi_ds_get_region_arguments(obj_desc);
 266                 break;
 267
 268         case ACPI_TYPE_BUFFER_FIELD:
 269
 270                 info->field_init++;
 271                 status = acpi_ds_get_buffer_field_arguments(obj_desc);
 272                 break;
 273
 274         case ACPI_TYPE_BUFFER:
 275
 276                 info->buffer_init++;
 277                 status = acpi_ds_get_buffer_arguments(obj_desc);
 278                 break;
 279
 280         case ACPI_TYPE_PACKAGE:
 281
 282                 info->package_init++;
 283                 status = acpi_ds_get_package_arguments(obj_desc);
 284                 break;
 285
 286         default:
 287                 /* No other types can get here */
 288                 break;
 289         }
 290
 291         if (ACPI_FAILURE(status)) {
 292                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_ERROR, "\n"));
 293                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 294                                   "Could not execute arguments for [%4.4s] (%s), %s\n",
 295                                   acpi_ut_get_node_name(node),
 296                                   acpi_ut_get_type_name(type),
 297                                   acpi_format_exception(status)));
 298         }
 299
 300         /*
 301          * Print a dot for each object unless we are going to print the entire
 302          * pathname
 303          */
 304         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
 305                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
 306         }
 307
 308         /*
 309          * We ignore errors from above, and always return OK, since we don't want
 310          * to abort the walk on any single error.
 311          */
 312         acpi_ex_exit_interpreter();
 313         return (AE_OK);
 314 }
 315
 316 /*******************************************************************************
 317  *
 318  * FUNCTION:    acpi_ns_init_one_device
 319  *
 320  * PARAMETERS:  acpi_walk_callback
 321  *
 322  * RETURN:      acpi_status
 323  *
 324  * DESCRIPTION: This is called once per device soon after ACPI is enabled
 325  *              to initialize each device. It determines if the device is
 326  *              present, and if so, calls _INI.
 327  *
 328  ******************************************************************************/
 329
 330 static acpi_status
 331 acpi_ns_init_one_device(acpi_handle obj_handle,
 332                         u32 nesting_level, void *context, void **return_value)
 333 {
 334         struct acpi_device_walk_info *info =
 335             (struct acpi_device_walk_info *)context;
 336         struct acpi_parameter_info pinfo;
 337         u32 flags;
 338         acpi_status status;
 339
 340         ACPI_FUNCTION_TRACE("ns_init_one_device");
 341
 342         pinfo.parameters = NULL;
 343         pinfo.parameter_type = ACPI_PARAM_ARGS;
 344
 345         pinfo.node = acpi_ns_map_handle_to_node(obj_handle);
 346         if (!pinfo.node) {
 347                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 348         }
 349
 350         /*
 351          * We will run _STA/_INI on Devices, Processors and thermal_zones only
 352          */
 353         if ((pinfo.node->type != ACPI_TYPE_DEVICE) &&
 354             (pinfo.node->type != ACPI_TYPE_PROCESSOR) &&
 355             (pinfo.node->type != ACPI_TYPE_THERMAL)) {
 356                 return_ACPI_STATUS(AE_OK);
 357         }
 358
 359         if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
 360             (!(acpi_dbg_level & ACPI_LV_INFO))) {
 361                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
 362         }
 363
 364         info->device_count++;
 365
 366         /*
 367          * Run _STA to determine if we can run _INI on the device.
 368          */
 369         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname(ACPI_TYPE_METHOD,
 370                                                       pinfo.node,
 371                                                       METHOD_NAME__STA));
 372         status = acpi_ut_execute_STA(pinfo.node, &flags);
 373
 374         if (ACPI_FAILURE(status)) {
 375                 if (pinfo.node->type == ACPI_TYPE_DEVICE) {
 376                         /* Ignore error and move on to next device */
 377
 378                         return_ACPI_STATUS(AE_OK);
 379                 }
 380
 381                 /* _STA is not required for Processor or thermal_zone objects */
 382         } else {
 383                 info->num_STA++;
 384
 385                 if (!(flags & 0x01)) {
 386                         /* Don't look at children of a not present device */
 387
 388                         return_ACPI_STATUS(AE_CTRL_DEPTH);
 389                 }
 390         }
 391
 392         /*
 393          * The device is present. Run _INI.
 394          */
 395         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname(ACPI_TYPE_METHOD,
 396                                                       pinfo.node,
 397                                                       METHOD_NAME__INI));
 398         status = acpi_ns_evaluate_relative(METHOD_NAME__INI, &pinfo);
 399         if (ACPI_FAILURE(status)) {
 400                 /* No _INI (AE_NOT_FOUND) means device requires no initialization */
 401
 402                 if (status != AE_NOT_FOUND) {
 403                         /* Ignore error and move on to next device */
 404
 405 #ifdef ACPI_DEBUG_OUTPUT
 406                         char *scope_name =
 407                             acpi_ns_get_external_pathname(pinfo.node);
 408
 409                         ACPI_DEBUG_PRINT((ACPI_DB_WARN, "%s._INI failed: %s\n",
 410                                           scope_name,
 411                                           acpi_format_exception(status)));
 412
 413                         ACPI_MEM_FREE(scope_name);
 414 #endif
 415                 }
 416
 417                 status = AE_OK;
 418         } else {
 419                 /* Delete any return object (especially if implicit_return is enabled) */
 420
 421                 if (pinfo.return_object) {
 422                         acpi_ut_remove_reference(pinfo.return_object);
 423                 }
 424
 425                 /* Count of successful INIs */
 426
 427                 info->num_INI++;
 428         }
 429
 430         if (acpi_gbl_init_handler) {
 431                 /* External initialization handler is present, call it */
 432
 433                 status =
 434                     acpi_gbl_init_handler(pinfo.node, ACPI_INIT_DEVICE_INI);
 435         }
 436
 437         return_ACPI_STATUS(status);
 438 }