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