linux/drivers/acpi/bus.c
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   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
  49ACPI_MODULE_NAME("bus");
  50
  51struct acpi_device *acpi_root;
  52struct proc_dir_entry *acpi_root_dir;
  53EXPORT_SYMBOL(acpi_root_dir);
  54
  55#define STRUCT_TO_INT(s)        (*((int*)&s))
  56
  57
  58#ifdef CONFIG_X86
  59static 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
  67static 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
  83static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  84        {}
  85};
  86#endif
  87
  88/* --------------------------------------------------------------------------
  89                                Device Management
  90   -------------------------------------------------------------------------- */
  91
  92int 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
 111EXPORT_SYMBOL(acpi_bus_get_device);
 112
 113acpi_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
 130int 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}
 153EXPORT_SYMBOL(acpi_bus_get_status);
 154
 155void acpi_bus_private_data_handler(acpi_handle handle,
 156                                   void *context)
 157{
 158        return;
 159}
 160EXPORT_SYMBOL(acpi_bus_private_data_handler);
 161
 162int 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}
 178EXPORT_SYMBOL(acpi_bus_get_private_data);
 179
 180static 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
 198static 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
 220acpi_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        }
 288out_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
 298out_kfree:
 299        kfree(output.pointer);
 300        if (status != AE_OK)
 301                context->ret.pointer = NULL;
 302        return status;
 303}
 304EXPORT_SYMBOL(acpi_run_osc);
 305
 306bool osc_sb_apei_support_acked;
 307static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 308static 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
 353static DEFINE_SPINLOCK(acpi_bus_event_lock);
 354
 355LIST_HEAD(acpi_bus_event_list);
 356DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 357
 358extern int event_is_open;
 359
 360int 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
 388EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 389
 390int 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
 398EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 399
 400int 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
 450static 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
 491static 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
 502static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 503int register_acpi_bus_notifier(struct notifier_block *nb)
 504{
 505        return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 506}
 507EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 508
 509void unregister_acpi_bus_notifier(struct notifier_block *nb)
 510{
 511        blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 512}
 513EXPORT_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 */
 520static 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
 593static 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
 637u8 acpi_gbl_permanent_mmap;
 638
 639
 640void __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
 714static 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
 803struct kobject *acpi_kobj;
 804EXPORT_SYMBOL_GPL(acpi_kobj);
 805
 806static 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
 837subsys_initcall(acpi_init);
 838
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