drivers/acpi/bus.c

   1 /*
   2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or (at
  11  *  your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/sched.h>
  31 #include <linux/pm.h>
  32 #include <linux/device.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/acpi.h>
  35 #include <linux/slab.h>
  36 #ifdef CONFIG_X86
  37 #include <asm/mpspec.h>
  38 #endif
  39 #include <linux/pci.h>
  40 #include <acpi/acpi_bus.h>
  41 #include <acpi/acpi_drivers.h>
  42 #include <acpi/apei.h>
  43 #include <linux/dmi.h>
  44 #include <linux/suspend.h>
  45
  46 #include "internal.h"
  47
  48 #define _COMPONENT              ACPI_BUS_COMPONENT
  49 ACPI_MODULE_NAME("bus");
  50
  51 struct acpi_device *acpi_root;
  52 struct proc_dir_entry *acpi_root_dir;
  53 EXPORT_SYMBOL(acpi_root_dir);
  54
  55 #define STRUCT_TO_INT(s)        (*((int*)&s))
  56
  57
  58 #ifdef CONFIG_X86
  59 static int set_copy_dsdt(const struct dmi_system_id *id)
  60 {
  61         printk(KERN_NOTICE "%s detected - "
  62                 "force copy of DSDT to local memory\n", id->ident);
  63         acpi_gbl_copy_dsdt_locally = 1;
  64         return 0;
  65 }
  66
  67 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  68         /*
  69          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  70          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  71          */
  72         {
  73          .callback = set_copy_dsdt,
  74          .ident = "TOSHIBA Satellite",
  75          .matches = {
  76                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  77                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  78                 },
  79         },
  80         {}
  81 };
  82 #else
  83 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  84         {}
  85 };
  86 #endif
  87
  88 /* --------------------------------------------------------------------------
  89                                 Device Management
  90    -------------------------------------------------------------------------- */
  91
  92 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  93 {
  94         acpi_status status = AE_OK;
  95
  96
  97         if (!device)
  98                 return -EINVAL;
  99
 100         /* TBD: Support fixed-feature devices */
 101
 102         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 103         if (ACPI_FAILURE(status) || !*device) {
 104                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 105                                   handle));
 106                 return -ENODEV;
 107         }
 108
 109         return 0;
 110 }
 111
 112 EXPORT_SYMBOL(acpi_bus_get_device);
 113
 114 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 115                                        unsigned long long *sta)
 116 {
 117         acpi_status status;
 118
 119         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 120         if (ACPI_SUCCESS(status))
 121                 return AE_OK;
 122
 123         if (status == AE_NOT_FOUND) {
 124                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 125                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 126                 return AE_OK;
 127         }
 128         return status;
 129 }
 130
 131 int acpi_bus_get_status(struct acpi_device *device)
 132 {
 133         acpi_status status;
 134         unsigned long long sta;
 135
 136         status = acpi_bus_get_status_handle(device->handle, &sta);
 137         if (ACPI_FAILURE(status))
 138                 return -ENODEV;
 139
 140         STRUCT_TO_INT(device->status) = (int) sta;
 141
 142         if (device->status.functional && !device->status.present) {
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 144                        "functional but not present;\n",
 145                         device->pnp.bus_id,
 146                         (u32) STRUCT_TO_INT(device->status)));
 147         }
 148
 149         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 150                           device->pnp.bus_id,
 151                           (u32) STRUCT_TO_INT(device->status)));
 152         return 0;
 153 }
 154 EXPORT_SYMBOL(acpi_bus_get_status);
 155
 156 void acpi_bus_private_data_handler(acpi_handle handle,
 157                                    void *context)
 158 {
 159         return;
 160 }
 161 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 162
 163 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 164 {
 165         acpi_status status = AE_OK;
 166
 167         if (!*data)
 168                 return -EINVAL;
 169
 170         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 171         if (ACPI_FAILURE(status) || !*data) {
 172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 173                                 handle));
 174                 return -ENODEV;
 175         }
 176
 177         return 0;
 178 }
 179 EXPORT_SYMBOL(acpi_bus_get_private_data);
 180
 181 static void acpi_print_osc_error(acpi_handle handle,
 182         struct acpi_osc_context *context, char *error)
 183 {
 184         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 185         int i;
 186
 187         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 188                 printk(KERN_DEBUG "%s\n", error);
 189         else {
 190                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 191                 kfree(buffer.pointer);
 192         }
 193         printk(KERN_DEBUG"_OSC request data:");
 194         for (i = 0; i < context->cap.length; i += sizeof(u32))
 195                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 196         printk("\n");
 197 }
 198
 199 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 200 {
 201         int i;
 202         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 203                 24, 26, 28, 30, 32, 34};
 204
 205         if (strlen(str) != 36)
 206                 return AE_BAD_PARAMETER;
 207         for (i = 0; i < 36; i++) {
 208                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 209                         if (str[i] != '-')
 210                                 return AE_BAD_PARAMETER;
 211                 } else if (!isxdigit(str[i]))
 212                         return AE_BAD_PARAMETER;
 213         }
 214         for (i = 0; i < 16; i++) {
 215                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 216                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 217         }
 218         return AE_OK;
 219 }
 220
 221 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 222 {
 223         acpi_status status;
 224         struct acpi_object_list input;
 225         union acpi_object in_params[4];
 226         union acpi_object *out_obj;
 227         u8 uuid[16];
 228         u32 errors;
 229         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 230
 231         if (!context)
 232                 return AE_ERROR;
 233         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 234                 return AE_ERROR;
 235         context->ret.length = ACPI_ALLOCATE_BUFFER;
 236         context->ret.pointer = NULL;
 237
 238         /* Setting up input parameters */
 239         input.count = 4;
 240         input.pointer = in_params;
 241         in_params[0].type               = ACPI_TYPE_BUFFER;
 242         in_params[0].buffer.length      = 16;
 243         in_params[0].buffer.pointer     = uuid;
 244         in_params[1].type               = ACPI_TYPE_INTEGER;
 245         in_params[1].integer.value      = context->rev;
 246         in_params[2].type               = ACPI_TYPE_INTEGER;
 247         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 248         in_params[3].type               = ACPI_TYPE_BUFFER;
 249         in_params[3].buffer.length      = context->cap.length;
 250         in_params[3].buffer.pointer     = context->cap.pointer;
 251
 252         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 253         if (ACPI_FAILURE(status))
 254                 return status;
 255
 256         if (!output.length)
 257                 return AE_NULL_OBJECT;
 258
 259         out_obj = output.pointer;
 260         if (out_obj->type != ACPI_TYPE_BUFFER
 261                 || out_obj->buffer.length != context->cap.length) {
 262                 acpi_print_osc_error(handle, context,
 263                         "_OSC evaluation returned wrong type");
 264                 status = AE_TYPE;
 265                 goto out_kfree;
 266         }
 267         /* Need to ignore the bit0 in result code */
 268         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 269         if (errors) {
 270                 if (errors & OSC_REQUEST_ERROR)
 271                         acpi_print_osc_error(handle, context,
 272                                 "_OSC request failed");
 273                 if (errors & OSC_INVALID_UUID_ERROR)
 274                         acpi_print_osc_error(handle, context,
 275                                 "_OSC invalid UUID");
 276                 if (errors & OSC_INVALID_REVISION_ERROR)
 277                         acpi_print_osc_error(handle, context,
 278                                 "_OSC invalid revision");
 279                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 280                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 281                             & OSC_QUERY_ENABLE)
 282                                 goto out_success;
 283                         status = AE_SUPPORT;
 284                         goto out_kfree;
 285                 }
 286                 status = AE_ERROR;
 287                 goto out_kfree;
 288         }
 289 out_success:
 290         context->ret.length = out_obj->buffer.length;
 291         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 292                                        context->ret.length, GFP_KERNEL);
 293         if (!context->ret.pointer) {
 294                 status =  AE_NO_MEMORY;
 295                 goto out_kfree;
 296         }
 297         status =  AE_OK;
 298
 299 out_kfree:
 300         kfree(output.pointer);
 301         if (status != AE_OK)
 302                 context->ret.pointer = NULL;
 303         return status;
 304 }
 305 EXPORT_SYMBOL(acpi_run_osc);
 306
 307 bool osc_sb_apei_support_acked;
 308 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 309 static void acpi_bus_osc_support(void)
 310 {
 311         u32 capbuf[2];
 312         struct acpi_osc_context context = {
 313                 .uuid_str = sb_uuid_str,
 314                 .rev = 1,
 315                 .cap.length = 8,
 316                 .cap.pointer = capbuf,
 317         };
 318         acpi_handle handle;
 319
 320         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 321         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 322 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 323                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 324         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 325 #endif
 326
 327 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 328         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 329 #endif
 330
 331 #ifdef ACPI_HOTPLUG_OST
 332         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 333 #endif
 334
 335         if (!ghes_disable)
 336                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 337         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 338                 return;
 339         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 340                 u32 *capbuf_ret = context.ret.pointer;
 341                 if (context.ret.length > OSC_SUPPORT_TYPE)
 342                         osc_sb_apei_support_acked =
 343                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 344                 kfree(context.ret.pointer);
 345         }
 346         /* do we need to check other returned cap? Sounds no */
 347 }
 348
 349 /* --------------------------------------------------------------------------
 350                                 Event Management
 351    -------------------------------------------------------------------------- */
 352
 353 #ifdef CONFIG_ACPI_PROC_EVENT
 354 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 355
 356 LIST_HEAD(acpi_bus_event_list);
 357 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 358
 359 extern int event_is_open;
 360
 361 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 362 {
 363         struct acpi_bus_event *event;
 364         unsigned long flags = 0;
 365
 366         /* drop event on the floor if no one's listening */
 367         if (!event_is_open)
 368                 return 0;
 369
 370         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 371         if (!event)
 372                 return -ENOMEM;
 373
 374         strcpy(event->device_class, device_class);
 375         strcpy(event->bus_id, bus_id);
 376         event->type = type;
 377         event->data = data;
 378
 379         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 380         list_add_tail(&event->node, &acpi_bus_event_list);
 381         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 382
 383         wake_up_interruptible(&acpi_bus_event_queue);
 384
 385         return 0;
 386
 387 }
 388
 389 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 390
 391 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 392 {
 393         if (!device)
 394                 return -EINVAL;
 395         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 396                                              device->pnp.bus_id, type, data);
 397 }
 398
 399 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 400
 401 int acpi_bus_receive_event(struct acpi_bus_event *event)
 402 {
 403         unsigned long flags = 0;
 404         struct acpi_bus_event *entry = NULL;
 405
 406         DECLARE_WAITQUEUE(wait, current);
 407
 408
 409         if (!event)
 410                 return -EINVAL;
 411
 412         if (list_empty(&acpi_bus_event_list)) {
 413
 414                 set_current_state(TASK_INTERRUPTIBLE);
 415                 add_wait_queue(&acpi_bus_event_queue, &wait);
 416
 417                 if (list_empty(&acpi_bus_event_list))
 418                         schedule();
 419
 420                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 421                 set_current_state(TASK_RUNNING);
 422
 423                 if (signal_pending(current))
 424                         return -ERESTARTSYS;
 425         }
 426
 427         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 428         if (!list_empty(&acpi_bus_event_list)) {
 429                 entry = list_entry(acpi_bus_event_list.next,
 430                                    struct acpi_bus_event, node);
 431                 list_del(&entry->node);
 432         }
 433         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 434
 435         if (!entry)
 436                 return -ENODEV;
 437
 438         memcpy(event, entry, sizeof(struct acpi_bus_event));
 439
 440         kfree(entry);
 441
 442         return 0;
 443 }
 444
 445 #endif  /* CONFIG_ACPI_PROC_EVENT */
 446
 447 /* --------------------------------------------------------------------------
 448                              Notification Handling
 449    -------------------------------------------------------------------------- */
 450
 451 static void acpi_bus_check_device(acpi_handle handle)
 452 {
 453         struct acpi_device *device;
 454         acpi_status status;
 455         struct acpi_device_status old_status;
 456
 457         if (acpi_bus_get_device(handle, &device))
 458                 return;
 459         if (!device)
 460                 return;
 461
 462         old_status = device->status;
 463
 464         /*
 465          * Make sure this device's parent is present before we go about
 466          * messing with the device.
 467          */
 468         if (device->parent && !device->parent->status.present) {
 469                 device->status = device->parent->status;
 470                 return;
 471         }
 472
 473         status = acpi_bus_get_status(device);
 474         if (ACPI_FAILURE(status))
 475                 return;
 476
 477         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 478                 return;
 479
 480         /*
 481          * Device Insertion/Removal
 482          */
 483         if ((device->status.present) && !(old_status.present)) {
 484                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 485                 /* TBD: Handle device insertion */
 486         } else if (!(device->status.present) && (old_status.present)) {
 487                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 488                 /* TBD: Handle device removal */
 489         }
 490 }
 491
 492 static void acpi_bus_check_scope(acpi_handle handle)
 493 {
 494         /* Status Change? */
 495         acpi_bus_check_device(handle);
 496
 497         /*
 498          * TBD: Enumerate child devices within this device's scope and
 499          *       run acpi_bus_check_device()'s on them.
 500          */
 501 }
 502
 503 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 504 int register_acpi_bus_notifier(struct notifier_block *nb)
 505 {
 506         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 507 }
 508 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 509
 510 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 511 {
 512         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 513 }
 514 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 515
 516 /**
 517  * acpi_bus_notify
 518  * ---------------
 519  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 520  */
 521 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 522 {
 523         struct acpi_device *device = NULL;
 524         struct acpi_driver *driver;
 525
 526         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 527                           type, handle));
 528
 529         blocking_notifier_call_chain(&acpi_bus_notify_list,
 530                 type, (void *)handle);
 531
 532         switch (type) {
 533
 534         case ACPI_NOTIFY_BUS_CHECK:
 535                 acpi_bus_check_scope(handle);
 536                 /*
 537                  * TBD: We'll need to outsource certain events to non-ACPI
 538                  *      drivers via the device manager (device.c).
 539                  */
 540                 break;
 541
 542         case ACPI_NOTIFY_DEVICE_CHECK:
 543                 acpi_bus_check_device(handle);
 544                 /*
 545                  * TBD: We'll need to outsource certain events to non-ACPI
 546                  *      drivers via the device manager (device.c).
 547                  */
 548                 break;
 549
 550         case ACPI_NOTIFY_DEVICE_WAKE:
 551                 /* TBD */
 552                 break;
 553
 554         case ACPI_NOTIFY_EJECT_REQUEST:
 555                 /* TBD */
 556                 break;
 557
 558         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 559                 /* TBD: Exactly what does 'light' mean? */
 560                 break;
 561
 562         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 563                 /* TBD */
 564                 break;
 565
 566         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 567                 /* TBD */
 568                 break;
 569
 570         case ACPI_NOTIFY_POWER_FAULT:
 571                 /* TBD */
 572                 break;
 573
 574         default:
 575                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 576                                   "Received unknown/unsupported notification [%08x]\n",
 577                                   type));
 578                 break;
 579         }
 580
 581         acpi_bus_get_device(handle, &device);
 582         if (device) {
 583                 driver = device->driver;
 584                 if (driver && driver->ops.notify &&
 585                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 586                         driver->ops.notify(device, type);
 587         }
 588 }
 589
 590 /* --------------------------------------------------------------------------
 591                              Initialization/Cleanup
 592    -------------------------------------------------------------------------- */
 593
 594 static int __init acpi_bus_init_irq(void)
 595 {
 596         acpi_status status = AE_OK;
 597         union acpi_object arg = { ACPI_TYPE_INTEGER };
 598         struct acpi_object_list arg_list = { 1, &arg };
 599         char *message = NULL;
 600
 601
 602         /*
 603          * Let the system know what interrupt model we are using by
 604          * evaluating the \_PIC object, if exists.
 605          */
 606
 607         switch (acpi_irq_model) {
 608         case ACPI_IRQ_MODEL_PIC:
 609                 message = "PIC";
 610                 break;
 611         case ACPI_IRQ_MODEL_IOAPIC:
 612                 message = "IOAPIC";
 613                 break;
 614         case ACPI_IRQ_MODEL_IOSAPIC:
 615                 message = "IOSAPIC";
 616                 break;
 617         case ACPI_IRQ_MODEL_PLATFORM:
 618                 message = "platform specific model";
 619                 break;
 620         default:
 621                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 622                 return -ENODEV;
 623         }
 624
 625         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 626
 627         arg.integer.value = acpi_irq_model;
 628
 629         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 630         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 631                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 632                 return -ENODEV;
 633         }
 634
 635         return 0;
 636 }
 637
 638 u8 acpi_gbl_permanent_mmap;
 639
 640
 641 void __init acpi_early_init(void)
 642 {
 643         acpi_status status = AE_OK;
 644
 645         if (acpi_disabled)
 646                 return;
 647
 648         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 649
 650         /* enable workarounds, unless strict ACPI spec. compliance */
 651         if (!acpi_strict)
 652                 acpi_gbl_enable_interpreter_slack = TRUE;
 653
 654         acpi_gbl_permanent_mmap = 1;
 655
 656         /*
 657          * If the machine falls into the DMI check table,
 658          * DSDT will be copied to memory
 659          */
 660         dmi_check_system(dsdt_dmi_table);
 661
 662         status = acpi_reallocate_root_table();
 663         if (ACPI_FAILURE(status)) {
 664                 printk(KERN_ERR PREFIX
 665                        "Unable to reallocate ACPI tables\n");
 666                 goto error0;
 667         }
 668
 669         status = acpi_initialize_subsystem();
 670         if (ACPI_FAILURE(status)) {
 671                 printk(KERN_ERR PREFIX
 672                        "Unable to initialize the ACPI Interpreter\n");
 673                 goto error0;
 674         }
 675
 676         status = acpi_load_tables();
 677         if (ACPI_FAILURE(status)) {
 678                 printk(KERN_ERR PREFIX
 679                        "Unable to load the System Description Tables\n");
 680                 goto error0;
 681         }
 682
 683 #ifdef CONFIG_X86
 684         if (!acpi_ioapic) {
 685                 /* compatible (0) means level (3) */
 686                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 687                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 688                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 689                 }
 690                 /* Set PIC-mode SCI trigger type */
 691                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 692                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 693         } else {
 694                 /*
 695                  * now that acpi_gbl_FADT is initialized,
 696                  * update it with result from INT_SRC_OVR parsing
 697                  */
 698                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 699         }
 700 #endif
 701
 702         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 703         if (ACPI_FAILURE(status)) {
 704                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 705                 goto error0;
 706         }
 707
 708         return;
 709
 710       error0:
 711         disable_acpi();
 712         return;
 713 }
 714
 715 static int __init acpi_bus_init(void)
 716 {
 717         int result = 0;
 718         acpi_status status = AE_OK;
 719         extern acpi_status acpi_os_initialize1(void);
 720
 721         acpi_os_initialize1();
 722
 723         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 724         if (ACPI_FAILURE(status)) {
 725                 printk(KERN_ERR PREFIX
 726                        "Unable to start the ACPI Interpreter\n");
 727                 goto error1;
 728         }
 729
 730         /*
 731          * ACPI 2.0 requires the EC driver to be loaded and work before
 732          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 733          * is called).
 734          *
 735          * This is accomplished by looking for the ECDT table, and getting
 736          * the EC parameters out of that.
 737          */
 738         status = acpi_ec_ecdt_probe();
 739         /* Ignore result. Not having an ECDT is not fatal. */
 740
 741         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 742         if (ACPI_FAILURE(status)) {
 743                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 744                 goto error1;
 745         }
 746
 747         /*
 748          * _OSC method may exist in module level code,
 749          * so it must be run after ACPI_FULL_INITIALIZATION
 750          */
 751         acpi_bus_osc_support();
 752
 753         /*
 754          * _PDC control method may load dynamic SSDT tables,
 755          * and we need to install the table handler before that.
 756          */
 757         acpi_sysfs_init();
 758
 759         acpi_early_processor_set_pdc();
 760
 761         /*
 762          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 763          * is necessary to enable it as early as possible.
 764          */
 765         acpi_boot_ec_enable();
 766
 767         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 768
 769         /* Initialize sleep structures */
 770         acpi_sleep_init();
 771
 772         /*
 773          * Get the system interrupt model and evaluate \_PIC.
 774          */
 775         result = acpi_bus_init_irq();
 776         if (result)
 777                 goto error1;
 778
 779         /*
 780          * Register the for all standard device notifications.
 781          */
 782         status =
 783             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 784                                         &acpi_bus_notify, NULL);
 785         if (ACPI_FAILURE(status)) {
 786                 printk(KERN_ERR PREFIX
 787                        "Unable to register for device notifications\n");
 788                 goto error1;
 789         }
 790
 791         /*
 792          * Create the top ACPI proc directory
 793          */
 794         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 795
 796         return 0;
 797
 798         /* Mimic structured exception handling */
 799       error1:
 800         acpi_terminate();
 801         return -ENODEV;
 802 }
 803
 804 struct kobject *acpi_kobj;
 805 EXPORT_SYMBOL_GPL(acpi_kobj);
 806
 807 static int __init acpi_init(void)
 808 {
 809         int result;
 810
 811         if (acpi_disabled) {
 812                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 813                 return -ENODEV;
 814         }
 815
 816         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 817         if (!acpi_kobj) {
 818                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 819                 acpi_kobj = NULL;
 820         }
 821
 822         init_acpi_device_notify();
 823         result = acpi_bus_init();
 824         if (result) {
 825                 disable_acpi();
 826                 return result;
 827         }
 828
 829         pci_mmcfg_late_init();
 830         acpi_scan_init();
 831         acpi_ec_init();
 832         acpi_debugfs_init();
 833         acpi_sleep_proc_init();
 834         acpi_wakeup_device_init();
 835         return 0;
 836 }
 837
 838 subsys_initcall(acpi_init);