drivers/acpi/bus.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   4  *
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  */
   7
   8 #define pr_fmt(fmt) "ACPI: " fmt
   9
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/ioport.h>
  13 #include <linux/kernel.h>
  14 #include <linux/list.h>
  15 #include <linux/sched.h>
  16 #include <linux/pm.h>
  17 #include <linux/device.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/acpi.h>
  20 #include <linux/slab.h>
  21 #include <linux/regulator/machine.h>
  22 #include <linux/workqueue.h>
  23 #include <linux/reboot.h>
  24 #include <linux/delay.h>
  25 #ifdef CONFIG_X86
  26 #include <asm/mpspec.h>
  27 #include <linux/dmi.h>
  28 #endif
  29 #include <linux/acpi_iort.h>
  30 #include <linux/acpi_viot.h>
  31 #include <linux/pci.h>
  32 #include <acpi/apei.h>
  33 #include <linux/suspend.h>
  34 #include <linux/prmt.h>
  35
  36 #include "internal.h"
  37
  38 struct acpi_device *acpi_root;
  39 struct proc_dir_entry *acpi_root_dir;
  40 EXPORT_SYMBOL(acpi_root_dir);
  41
  42 #ifdef CONFIG_X86
  43 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  44 static inline int set_copy_dsdt(const struct dmi_system_id *id)
  45 {
  46         return 0;
  47 }
  48 #else
  49 static int set_copy_dsdt(const struct dmi_system_id *id)
  50 {
  51         pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
  52         acpi_gbl_copy_dsdt_locally = 1;
  53         return 0;
  54 }
  55 #endif
  56
  57 static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
  58         /*
  59          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  60          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  61          */
  62         {
  63          .callback = set_copy_dsdt,
  64          .ident = "TOSHIBA Satellite",
  65          .matches = {
  66                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  67                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  68                 },
  69         },
  70         {}
  71 };
  72 #endif
  73
  74 /* --------------------------------------------------------------------------
  75                                 Device Management
  76    -------------------------------------------------------------------------- */
  77
  78 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  79                                        unsigned long long *sta)
  80 {
  81         acpi_status status;
  82
  83         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  84         if (ACPI_SUCCESS(status))
  85                 return AE_OK;
  86
  87         if (status == AE_NOT_FOUND) {
  88                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
  89                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
  90                 return AE_OK;
  91         }
  92         return status;
  93 }
  94 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
  95
  96 int acpi_bus_get_status(struct acpi_device *device)
  97 {
  98         acpi_status status;
  99         unsigned long long sta;
 100
 101         if (acpi_device_always_present(device)) {
 102                 acpi_set_device_status(device, ACPI_STA_DEFAULT);
 103                 return 0;
 104         }
 105
 106         /* Battery devices must have their deps met before calling _STA */
 107         if (acpi_device_is_battery(device) && device->dep_unmet) {
 108                 acpi_set_device_status(device, 0);
 109                 return 0;
 110         }
 111
 112         status = acpi_bus_get_status_handle(device->handle, &sta);
 113         if (ACPI_FAILURE(status))
 114                 return -ENODEV;
 115
 116         acpi_set_device_status(device, sta);
 117
 118         if (device->status.functional && !device->status.present) {
 119                 pr_debug("Device [%s] status [%08x]: functional but not present\n",
 120                          device->pnp.bus_id, (u32)sta);
 121         }
 122
 123         pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
 124         return 0;
 125 }
 126 EXPORT_SYMBOL(acpi_bus_get_status);
 127
 128 void acpi_bus_private_data_handler(acpi_handle handle,
 129                                    void *context)
 130 {
 131         return;
 132 }
 133 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 134
 135 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
 136 {
 137         acpi_status status;
 138
 139         status = acpi_attach_data(handle,
 140                         acpi_bus_private_data_handler, data);
 141         if (ACPI_FAILURE(status)) {
 142                 acpi_handle_debug(handle, "Error attaching device data\n");
 143                 return -ENODEV;
 144         }
 145
 146         return 0;
 147 }
 148 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
 149
 150 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 151 {
 152         acpi_status status;
 153
 154         if (!data)
 155                 return -EINVAL;
 156
 157         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 158         if (ACPI_FAILURE(status)) {
 159                 acpi_handle_debug(handle, "No context for object\n");
 160                 return -ENODEV;
 161         }
 162
 163         return 0;
 164 }
 165 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
 166
 167 void acpi_bus_detach_private_data(acpi_handle handle)
 168 {
 169         acpi_detach_data(handle, acpi_bus_private_data_handler);
 170 }
 171 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
 172
 173 static void acpi_print_osc_error(acpi_handle handle,
 174                                  struct acpi_osc_context *context, char *error)
 175 {
 176         int i;
 177
 178         acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
 179
 180         pr_debug("_OSC request data:");
 181         for (i = 0; i < context->cap.length; i += sizeof(u32))
 182                 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
 183
 184         pr_debug("\n");
 185 }
 186
 187 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 188 {
 189         acpi_status status;
 190         struct acpi_object_list input;
 191         union acpi_object in_params[4];
 192         union acpi_object *out_obj;
 193         guid_t guid;
 194         u32 errors;
 195         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 196
 197         if (!context)
 198                 return AE_ERROR;
 199         if (guid_parse(context->uuid_str, &guid))
 200                 return AE_ERROR;
 201         context->ret.length = ACPI_ALLOCATE_BUFFER;
 202         context->ret.pointer = NULL;
 203
 204         /* Setting up input parameters */
 205         input.count = 4;
 206         input.pointer = in_params;
 207         in_params[0].type               = ACPI_TYPE_BUFFER;
 208         in_params[0].buffer.length      = 16;
 209         in_params[0].buffer.pointer     = (u8 *)&guid;
 210         in_params[1].type               = ACPI_TYPE_INTEGER;
 211         in_params[1].integer.value      = context->rev;
 212         in_params[2].type               = ACPI_TYPE_INTEGER;
 213         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 214         in_params[3].type               = ACPI_TYPE_BUFFER;
 215         in_params[3].buffer.length      = context->cap.length;
 216         in_params[3].buffer.pointer     = context->cap.pointer;
 217
 218         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 219         if (ACPI_FAILURE(status))
 220                 return status;
 221
 222         if (!output.length)
 223                 return AE_NULL_OBJECT;
 224
 225         out_obj = output.pointer;
 226         if (out_obj->type != ACPI_TYPE_BUFFER
 227                 || out_obj->buffer.length != context->cap.length) {
 228                 acpi_print_osc_error(handle, context,
 229                         "_OSC evaluation returned wrong type");
 230                 status = AE_TYPE;
 231                 goto out_kfree;
 232         }
 233         /* Need to ignore the bit0 in result code */
 234         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 235         if (errors) {
 236                 if (errors & OSC_REQUEST_ERROR)
 237                         acpi_print_osc_error(handle, context,
 238                                 "_OSC request failed");
 239                 if (errors & OSC_INVALID_UUID_ERROR)
 240                         acpi_print_osc_error(handle, context,
 241                                 "_OSC invalid UUID");
 242                 if (errors & OSC_INVALID_REVISION_ERROR)
 243                         acpi_print_osc_error(handle, context,
 244                                 "_OSC invalid revision");
 245                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 246                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 247                             & OSC_QUERY_ENABLE)
 248                                 goto out_success;
 249                         status = AE_SUPPORT;
 250                         goto out_kfree;
 251                 }
 252                 status = AE_ERROR;
 253                 goto out_kfree;
 254         }
 255 out_success:
 256         context->ret.length = out_obj->buffer.length;
 257         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 258                                        context->ret.length, GFP_KERNEL);
 259         if (!context->ret.pointer) {
 260                 status =  AE_NO_MEMORY;
 261                 goto out_kfree;
 262         }
 263         status =  AE_OK;
 264
 265 out_kfree:
 266         kfree(output.pointer);
 267         return status;
 268 }
 269 EXPORT_SYMBOL(acpi_run_osc);
 270
 271 bool osc_sb_apei_support_acked;
 272
 273 /*
 274  * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
 275  * OSPM supports platform coordinated low power idle(LPI) states
 276  */
 277 bool osc_pc_lpi_support_confirmed;
 278 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
 279
 280 /*
 281  * ACPI 6.4 Operating System Capabilities for USB.
 282  */
 283 bool osc_sb_native_usb4_support_confirmed;
 284 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
 285
 286 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 287 static void acpi_bus_osc_negotiate_platform_control(void)
 288 {
 289         u32 capbuf[2], *capbuf_ret;
 290         struct acpi_osc_context context = {
 291                 .uuid_str = sb_uuid_str,
 292                 .rev = 1,
 293                 .cap.length = 8,
 294                 .cap.pointer = capbuf,
 295         };
 296         acpi_handle handle;
 297
 298         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 299         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 300         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
 301                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 302         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 303                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 304
 305         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 306         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
 307         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
 308
 309 #ifdef CONFIG_ARM64
 310         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 311 #endif
 312 #ifdef CONFIG_X86
 313         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 314         if (boot_cpu_has(X86_FEATURE_HWP)) {
 315                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
 316                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
 317         }
 318 #endif
 319
 320         if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
 321                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
 322
 323         if (IS_ENABLED(CONFIG_USB4))
 324                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
 325
 326         if (!ghes_disable)
 327                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 328         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 329                 return;
 330
 331         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 332                 return;
 333
 334         kfree(context.ret.pointer);
 335
 336         /* Now run _OSC again with query flag clear */
 337         capbuf[OSC_QUERY_DWORD] = 0;
 338
 339         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 340                 return;
 341
 342         capbuf_ret = context.ret.pointer;
 343         osc_sb_apei_support_acked =
 344                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 345         osc_pc_lpi_support_confirmed =
 346                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
 347         osc_sb_native_usb4_support_confirmed =
 348                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
 349
 350         kfree(context.ret.pointer);
 351 }
 352
 353 /*
 354  * Native control of USB4 capabilities. If any of the tunneling bits is
 355  * set it means OS is in control and we use software based connection
 356  * manager.
 357  */
 358 u32 osc_sb_native_usb4_control;
 359 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
 360
 361 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
 362 {
 363         pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
 364                (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
 365                (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
 366                (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
 367                (bits & OSC_USB_XDOMAIN) ? '+' : '-');
 368 }
 369
 370 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
 371 static void acpi_bus_osc_negotiate_usb_control(void)
 372 {
 373         u32 capbuf[3];
 374         struct acpi_osc_context context = {
 375                 .uuid_str = sb_usb_uuid_str,
 376                 .rev = 1,
 377                 .cap.length = sizeof(capbuf),
 378                 .cap.pointer = capbuf,
 379         };
 380         acpi_handle handle;
 381         acpi_status status;
 382         u32 control;
 383
 384         if (!osc_sb_native_usb4_support_confirmed)
 385                 return;
 386
 387         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 388                 return;
 389
 390         control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
 391                   OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
 392
 393         capbuf[OSC_QUERY_DWORD] = 0;
 394         capbuf[OSC_SUPPORT_DWORD] = 0;
 395         capbuf[OSC_CONTROL_DWORD] = control;
 396
 397         status = acpi_run_osc(handle, &context);
 398         if (ACPI_FAILURE(status))
 399                 return;
 400
 401         if (context.ret.length != sizeof(capbuf)) {
 402                 pr_info("USB4 _OSC: returned invalid length buffer\n");
 403                 goto out_free;
 404         }
 405
 406         osc_sb_native_usb4_control =
 407                 control & ((u32 *)context.ret.pointer)[OSC_CONTROL_DWORD];
 408
 409         acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
 410         acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
 411                                 osc_sb_native_usb4_control);
 412
 413 out_free:
 414         kfree(context.ret.pointer);
 415 }
 416
 417 /* --------------------------------------------------------------------------
 418                              Notification Handling
 419    -------------------------------------------------------------------------- */
 420
 421 /**
 422  * acpi_bus_notify
 423  * ---------------
 424  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 425  */
 426 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 427 {
 428         struct acpi_device *adev;
 429         struct acpi_driver *driver;
 430         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 431         bool hotplug_event = false;
 432
 433         switch (type) {
 434         case ACPI_NOTIFY_BUS_CHECK:
 435                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 436                 hotplug_event = true;
 437                 break;
 438
 439         case ACPI_NOTIFY_DEVICE_CHECK:
 440                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 441                 hotplug_event = true;
 442                 break;
 443
 444         case ACPI_NOTIFY_DEVICE_WAKE:
 445                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 446                 break;
 447
 448         case ACPI_NOTIFY_EJECT_REQUEST:
 449                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 450                 hotplug_event = true;
 451                 break;
 452
 453         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 454                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 455                 /* TBD: Exactly what does 'light' mean? */
 456                 break;
 457
 458         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 459                 acpi_handle_err(handle, "Device cannot be configured due "
 460                                 "to a frequency mismatch\n");
 461                 break;
 462
 463         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 464                 acpi_handle_err(handle, "Device cannot be configured due "
 465                                 "to a bus mode mismatch\n");
 466                 break;
 467
 468         case ACPI_NOTIFY_POWER_FAULT:
 469                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 470                 break;
 471
 472         default:
 473                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 474                 break;
 475         }
 476
 477         adev = acpi_bus_get_acpi_device(handle);
 478         if (!adev)
 479                 goto err;
 480
 481         driver = adev->driver;
 482         if (driver && driver->ops.notify &&
 483             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 484                 driver->ops.notify(adev, type);
 485
 486         if (!hotplug_event) {
 487                 acpi_bus_put_acpi_device(adev);
 488                 return;
 489         }
 490
 491         if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 492                 return;
 493
 494         acpi_bus_put_acpi_device(adev);
 495
 496  err:
 497         acpi_evaluate_ost(handle, type, ost_code, NULL);
 498 }
 499
 500 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 501 {
 502         struct acpi_device *device = data;
 503
 504         device->driver->ops.notify(device, event);
 505 }
 506
 507 static void acpi_device_notify_fixed(void *data)
 508 {
 509         struct acpi_device *device = data;
 510
 511         /* Fixed hardware devices have no handles */
 512         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 513 }
 514
 515 static u32 acpi_device_fixed_event(void *data)
 516 {
 517         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
 518         return ACPI_INTERRUPT_HANDLED;
 519 }
 520
 521 static int acpi_device_install_notify_handler(struct acpi_device *device)
 522 {
 523         acpi_status status;
 524
 525         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 526                 status =
 527                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 528                                                      acpi_device_fixed_event,
 529                                                      device);
 530         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 531                 status =
 532                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 533                                                      acpi_device_fixed_event,
 534                                                      device);
 535         else
 536                 status = acpi_install_notify_handler(device->handle,
 537                                                      ACPI_DEVICE_NOTIFY,
 538                                                      acpi_device_notify,
 539                                                      device);
 540
 541         if (ACPI_FAILURE(status))
 542                 return -EINVAL;
 543         return 0;
 544 }
 545
 546 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 547 {
 548         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 549                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 550                                                 acpi_device_fixed_event);
 551         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 552                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 553                                                 acpi_device_fixed_event);
 554         else
 555                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 556                                            acpi_device_notify);
 557 }
 558
 559 /* Handle events targeting \_SB device (at present only graceful shutdown) */
 560
 561 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 562 #define ACPI_SB_INDICATE_INTERVAL       10000
 563
 564 static void sb_notify_work(struct work_struct *dummy)
 565 {
 566         acpi_handle sb_handle;
 567
 568         orderly_poweroff(true);
 569
 570         /*
 571          * After initiating graceful shutdown, the ACPI spec requires OSPM
 572          * to evaluate _OST method once every 10seconds to indicate that
 573          * the shutdown is in progress
 574          */
 575         acpi_get_handle(NULL, "\\_SB", &sb_handle);
 576         while (1) {
 577                 pr_info("Graceful shutdown in progress.\n");
 578                 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 579                                 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 580                 msleep(ACPI_SB_INDICATE_INTERVAL);
 581         }
 582 }
 583
 584 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 585 {
 586         static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 587
 588         if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 589                 if (!work_busy(&acpi_sb_work))
 590                         schedule_work(&acpi_sb_work);
 591         } else
 592                 pr_warn("event %x is not supported by \\_SB device\n", event);
 593 }
 594
 595 static int __init acpi_setup_sb_notify_handler(void)
 596 {
 597         acpi_handle sb_handle;
 598
 599         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 600                 return -ENXIO;
 601
 602         if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 603                                                 acpi_sb_notify, NULL)))
 604                 return -EINVAL;
 605
 606         return 0;
 607 }
 608
 609 /* --------------------------------------------------------------------------
 610                              Device Matching
 611    -------------------------------------------------------------------------- */
 612
 613 /**
 614  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 615  * @adev:       ACPI device in question
 616  *
 617  * Return: First physical node of ACPI device @adev
 618  */
 619 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 620 {
 621         struct mutex *physical_node_lock = &adev->physical_node_lock;
 622         struct device *phys_dev;
 623
 624         mutex_lock(physical_node_lock);
 625         if (list_empty(&adev->physical_node_list)) {
 626                 phys_dev = NULL;
 627         } else {
 628                 const struct acpi_device_physical_node *node;
 629
 630                 node = list_first_entry(&adev->physical_node_list,
 631                                         struct acpi_device_physical_node, node);
 632
 633                 phys_dev = node->dev;
 634         }
 635         mutex_unlock(physical_node_lock);
 636         return phys_dev;
 637 }
 638 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
 639
 640 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 641                                                       const struct device *dev)
 642 {
 643         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 644
 645         return phys_dev && phys_dev == dev ? adev : NULL;
 646 }
 647
 648 /**
 649  * acpi_device_is_first_physical_node - Is given dev first physical node
 650  * @adev: ACPI companion device
 651  * @dev: Physical device to check
 652  *
 653  * Function checks if given @dev is the first physical devices attached to
 654  * the ACPI companion device. This distinction is needed in some cases
 655  * where the same companion device is shared between many physical devices.
 656  *
 657  * Note that the caller have to provide valid @adev pointer.
 658  */
 659 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 660                                         const struct device *dev)
 661 {
 662         return !!acpi_primary_dev_companion(adev, dev);
 663 }
 664
 665 /*
 666  * acpi_companion_match() - Can we match via ACPI companion device
 667  * @dev: Device in question
 668  *
 669  * Check if the given device has an ACPI companion and if that companion has
 670  * a valid list of PNP IDs, and if the device is the first (primary) physical
 671  * device associated with it.  Return the companion pointer if that's the case
 672  * or NULL otherwise.
 673  *
 674  * If multiple physical devices are attached to a single ACPI companion, we need
 675  * to be careful.  The usage scenario for this kind of relationship is that all
 676  * of the physical devices in question use resources provided by the ACPI
 677  * companion.  A typical case is an MFD device where all the sub-devices share
 678  * the parent's ACPI companion.  In such cases we can only allow the primary
 679  * (first) physical device to be matched with the help of the companion's PNP
 680  * IDs.
 681  *
 682  * Additional physical devices sharing the ACPI companion can still use
 683  * resources available from it but they will be matched normally using functions
 684  * provided by their bus types (and analogously for their modalias).
 685  */
 686 struct acpi_device *acpi_companion_match(const struct device *dev)
 687 {
 688         struct acpi_device *adev;
 689
 690         adev = ACPI_COMPANION(dev);
 691         if (!adev)
 692                 return NULL;
 693
 694         if (list_empty(&adev->pnp.ids))
 695                 return NULL;
 696
 697         return acpi_primary_dev_companion(adev, dev);
 698 }
 699
 700 /**
 701  * acpi_of_match_device - Match device object using the "compatible" property.
 702  * @adev: ACPI device object to match.
 703  * @of_match_table: List of device IDs to match against.
 704  * @of_id: OF ID if matched
 705  *
 706  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 707  * identifiers and a _DSD object with the "compatible" property, use that
 708  * property to match against the given list of identifiers.
 709  */
 710 static bool acpi_of_match_device(struct acpi_device *adev,
 711                                  const struct of_device_id *of_match_table,
 712                                  const struct of_device_id **of_id)
 713 {
 714         const union acpi_object *of_compatible, *obj;
 715         int i, nval;
 716
 717         if (!adev)
 718                 return false;
 719
 720         of_compatible = adev->data.of_compatible;
 721         if (!of_match_table || !of_compatible)
 722                 return false;
 723
 724         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 725                 nval = of_compatible->package.count;
 726                 obj = of_compatible->package.elements;
 727         } else { /* Must be ACPI_TYPE_STRING. */
 728                 nval = 1;
 729                 obj = of_compatible;
 730         }
 731         /* Now we can look for the driver DT compatible strings */
 732         for (i = 0; i < nval; i++, obj++) {
 733                 const struct of_device_id *id;
 734
 735                 for (id = of_match_table; id->compatible[0]; id++)
 736                         if (!strcasecmp(obj->string.pointer, id->compatible)) {
 737                                 if (of_id)
 738                                         *of_id = id;
 739                                 return true;
 740                         }
 741         }
 742
 743         return false;
 744 }
 745
 746 static bool acpi_of_modalias(struct acpi_device *adev,
 747                              char *modalias, size_t len)
 748 {
 749         const union acpi_object *of_compatible;
 750         const union acpi_object *obj;
 751         const char *str, *chr;
 752
 753         of_compatible = adev->data.of_compatible;
 754         if (!of_compatible)
 755                 return false;
 756
 757         if (of_compatible->type == ACPI_TYPE_PACKAGE)
 758                 obj = of_compatible->package.elements;
 759         else /* Must be ACPI_TYPE_STRING. */
 760                 obj = of_compatible;
 761
 762         str = obj->string.pointer;
 763         chr = strchr(str, ',');
 764         strlcpy(modalias, chr ? chr + 1 : str, len);
 765
 766         return true;
 767 }
 768
 769 /**
 770  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 771  * @adev:       ACPI device object to match
 772  * @default_id: ID string to use as default if no compatible string found
 773  * @modalias:   Pointer to buffer that modalias value will be copied into
 774  * @len:        Length of modalias buffer
 775  *
 776  * This is a counterpart of of_modalias_node() for struct acpi_device objects.
 777  * If there is a compatible string for @adev, it will be copied to @modalias
 778  * with the vendor prefix stripped; otherwise, @default_id will be used.
 779  */
 780 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 781                        char *modalias, size_t len)
 782 {
 783         if (!acpi_of_modalias(adev, modalias, len))
 784                 strlcpy(modalias, default_id, len);
 785 }
 786 EXPORT_SYMBOL_GPL(acpi_set_modalias);
 787
 788 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 789                                     struct acpi_hardware_id *hwid)
 790 {
 791         int i, msk, byte_shift;
 792         char buf[3];
 793
 794         if (!id->cls)
 795                 return false;
 796
 797         /* Apply class-code bitmask, before checking each class-code byte */
 798         for (i = 1; i <= 3; i++) {
 799                 byte_shift = 8 * (3 - i);
 800                 msk = (id->cls_msk >> byte_shift) & 0xFF;
 801                 if (!msk)
 802                         continue;
 803
 804                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 805                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 806                         return false;
 807         }
 808         return true;
 809 }
 810
 811 static bool __acpi_match_device(struct acpi_device *device,
 812                                 const struct acpi_device_id *acpi_ids,
 813                                 const struct of_device_id *of_ids,
 814                                 const struct acpi_device_id **acpi_id,
 815                                 const struct of_device_id **of_id)
 816 {
 817         const struct acpi_device_id *id;
 818         struct acpi_hardware_id *hwid;
 819
 820         /*
 821          * If the device is not present, it is unnecessary to load device
 822          * driver for it.
 823          */
 824         if (!device || !device->status.present)
 825                 return false;
 826
 827         list_for_each_entry(hwid, &device->pnp.ids, list) {
 828                 /* First, check the ACPI/PNP IDs provided by the caller. */
 829                 if (acpi_ids) {
 830                         for (id = acpi_ids; id->id[0] || id->cls; id++) {
 831                                 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
 832                                         goto out_acpi_match;
 833                                 if (id->cls && __acpi_match_device_cls(id, hwid))
 834                                         goto out_acpi_match;
 835                         }
 836                 }
 837
 838                 /*
 839                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 840                  * "compatible" property if found.
 841                  */
 842                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
 843                         return acpi_of_match_device(device, of_ids, of_id);
 844         }
 845         return false;
 846
 847 out_acpi_match:
 848         if (acpi_id)
 849                 *acpi_id = id;
 850         return true;
 851 }
 852
 853 /**
 854  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 855  * @ids: Array of struct acpi_device_id object to match against.
 856  * @dev: The device structure to match.
 857  *
 858  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 859  * object for that handle and use that object to match against a given list of
 860  * device IDs.
 861  *
 862  * Return a pointer to the first matching ID on success or %NULL on failure.
 863  */
 864 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 865                                                const struct device *dev)
 866 {
 867         const struct acpi_device_id *id = NULL;
 868
 869         __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
 870         return id;
 871 }
 872 EXPORT_SYMBOL_GPL(acpi_match_device);
 873
 874 static const void *acpi_of_device_get_match_data(const struct device *dev)
 875 {
 876         struct acpi_device *adev = ACPI_COMPANION(dev);
 877         const struct of_device_id *match = NULL;
 878
 879         if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
 880                 return NULL;
 881
 882         return match->data;
 883 }
 884
 885 const void *acpi_device_get_match_data(const struct device *dev)
 886 {
 887         const struct acpi_device_id *match;
 888
 889         if (!dev->driver->acpi_match_table)
 890                 return acpi_of_device_get_match_data(dev);
 891
 892         match = acpi_match_device(dev->driver->acpi_match_table, dev);
 893         if (!match)
 894                 return NULL;
 895
 896         return (const void *)match->driver_data;
 897 }
 898 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 899
 900 int acpi_match_device_ids(struct acpi_device *device,
 901                           const struct acpi_device_id *ids)
 902 {
 903         return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
 904 }
 905 EXPORT_SYMBOL(acpi_match_device_ids);
 906
 907 bool acpi_driver_match_device(struct device *dev,
 908                               const struct device_driver *drv)
 909 {
 910         if (!drv->acpi_match_table)
 911                 return acpi_of_match_device(ACPI_COMPANION(dev),
 912                                             drv->of_match_table,
 913                                             NULL);
 914
 915         return __acpi_match_device(acpi_companion_match(dev),
 916                                    drv->acpi_match_table, drv->of_match_table,
 917                                    NULL, NULL);
 918 }
 919 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 920
 921 /* --------------------------------------------------------------------------
 922                               ACPI Driver Management
 923    -------------------------------------------------------------------------- */
 924
 925 /**
 926  * acpi_bus_register_driver - register a driver with the ACPI bus
 927  * @driver: driver being registered
 928  *
 929  * Registers a driver with the ACPI bus.  Searches the namespace for all
 930  * devices that match the driver's criteria and binds.  Returns zero for
 931  * success or a negative error status for failure.
 932  */
 933 int acpi_bus_register_driver(struct acpi_driver *driver)
 934 {
 935         int ret;
 936
 937         if (acpi_disabled)
 938                 return -ENODEV;
 939         driver->drv.name = driver->name;
 940         driver->drv.bus = &acpi_bus_type;
 941         driver->drv.owner = driver->owner;
 942
 943         ret = driver_register(&driver->drv);
 944         return ret;
 945 }
 946
 947 EXPORT_SYMBOL(acpi_bus_register_driver);
 948
 949 /**
 950  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 951  * @driver: driver to unregister
 952  *
 953  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 954  * devices that match the driver's criteria and unbinds.
 955  */
 956 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 957 {
 958         driver_unregister(&driver->drv);
 959 }
 960
 961 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 962
 963 /* --------------------------------------------------------------------------
 964                               ACPI Bus operations
 965    -------------------------------------------------------------------------- */
 966
 967 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 968 {
 969         struct acpi_device *acpi_dev = to_acpi_device(dev);
 970         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 971
 972         return acpi_dev->flags.match_driver
 973                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 974 }
 975
 976 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 977 {
 978         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
 979 }
 980
 981 static int acpi_device_probe(struct device *dev)
 982 {
 983         struct acpi_device *acpi_dev = to_acpi_device(dev);
 984         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 985         int ret;
 986
 987         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
 988                 return -EINVAL;
 989
 990         if (!acpi_drv->ops.add)
 991                 return -ENOSYS;
 992
 993         ret = acpi_drv->ops.add(acpi_dev);
 994         if (ret)
 995                 return ret;
 996
 997         acpi_dev->driver = acpi_drv;
 998
 999         pr_debug("Driver [%s] successfully bound to device [%s]\n",
1000                  acpi_drv->name, acpi_dev->pnp.bus_id);
1001
1002         if (acpi_drv->ops.notify) {
1003                 ret = acpi_device_install_notify_handler(acpi_dev);
1004                 if (ret) {
1005                         if (acpi_drv->ops.remove)
1006                                 acpi_drv->ops.remove(acpi_dev);
1007
1008                         acpi_dev->driver = NULL;
1009                         acpi_dev->driver_data = NULL;
1010                         return ret;
1011                 }
1012         }
1013
1014         pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1015                  acpi_dev->pnp.bus_id);
1016
1017         get_device(dev);
1018         return 0;
1019 }
1020
1021 static int acpi_device_remove(struct device *dev)
1022 {
1023         struct acpi_device *acpi_dev = to_acpi_device(dev);
1024         struct acpi_driver *acpi_drv = acpi_dev->driver;
1025
1026         if (acpi_drv) {
1027                 if (acpi_drv->ops.notify)
1028                         acpi_device_remove_notify_handler(acpi_dev);
1029                 if (acpi_drv->ops.remove)
1030                         acpi_drv->ops.remove(acpi_dev);
1031         }
1032         acpi_dev->driver = NULL;
1033         acpi_dev->driver_data = NULL;
1034
1035         put_device(dev);
1036         return 0;
1037 }
1038
1039 struct bus_type acpi_bus_type = {
1040         .name           = "acpi",
1041         .match          = acpi_bus_match,
1042         .probe          = acpi_device_probe,
1043         .remove         = acpi_device_remove,
1044         .uevent         = acpi_device_uevent,
1045 };
1046
1047 /* --------------------------------------------------------------------------
1048                              Initialization/Cleanup
1049    -------------------------------------------------------------------------- */
1050
1051 static int __init acpi_bus_init_irq(void)
1052 {
1053         acpi_status status;
1054         char *message = NULL;
1055
1056
1057         /*
1058          * Let the system know what interrupt model we are using by
1059          * evaluating the \_PIC object, if exists.
1060          */
1061
1062         switch (acpi_irq_model) {
1063         case ACPI_IRQ_MODEL_PIC:
1064                 message = "PIC";
1065                 break;
1066         case ACPI_IRQ_MODEL_IOAPIC:
1067                 message = "IOAPIC";
1068                 break;
1069         case ACPI_IRQ_MODEL_IOSAPIC:
1070                 message = "IOSAPIC";
1071                 break;
1072         case ACPI_IRQ_MODEL_GIC:
1073                 message = "GIC";
1074                 break;
1075         case ACPI_IRQ_MODEL_PLATFORM:
1076                 message = "platform specific model";
1077                 break;
1078         default:
1079                 pr_info("Unknown interrupt routing model\n");
1080                 return -ENODEV;
1081         }
1082
1083         pr_info("Using %s for interrupt routing\n", message);
1084
1085         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1086         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1087                 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1088                 return -ENODEV;
1089         }
1090
1091         return 0;
1092 }
1093
1094 /**
1095  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1096  *
1097  * The ACPI tables are accessible after this, but the handling of events has not
1098  * been initialized and the global lock is not available yet, so AML should not
1099  * be executed at this point.
1100  *
1101  * Doing this before switching the EFI runtime services to virtual mode allows
1102  * the EfiBootServices memory to be freed slightly earlier on boot.
1103  */
1104 void __init acpi_early_init(void)
1105 {
1106         acpi_status status;
1107
1108         if (acpi_disabled)
1109                 return;
1110
1111         pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1112
1113         /* enable workarounds, unless strict ACPI spec. compliance */
1114         if (!acpi_strict)
1115                 acpi_gbl_enable_interpreter_slack = TRUE;
1116
1117         acpi_permanent_mmap = true;
1118
1119 #ifdef CONFIG_X86
1120         /*
1121          * If the machine falls into the DMI check table,
1122          * DSDT will be copied to memory.
1123          * Note that calling dmi_check_system() here on other architectures
1124          * would not be OK because only x86 initializes dmi early enough.
1125          * Thankfully only x86 systems need such quirks for now.
1126          */
1127         dmi_check_system(dsdt_dmi_table);
1128 #endif
1129
1130         status = acpi_reallocate_root_table();
1131         if (ACPI_FAILURE(status)) {
1132                 pr_err("Unable to reallocate ACPI tables\n");
1133                 goto error0;
1134         }
1135
1136         status = acpi_initialize_subsystem();
1137         if (ACPI_FAILURE(status)) {
1138                 pr_err("Unable to initialize the ACPI Interpreter\n");
1139                 goto error0;
1140         }
1141
1142 #ifdef CONFIG_X86
1143         if (!acpi_ioapic) {
1144                 /* compatible (0) means level (3) */
1145                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1146                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1147                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1148                 }
1149                 /* Set PIC-mode SCI trigger type */
1150                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1151                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1152         } else {
1153                 /*
1154                  * now that acpi_gbl_FADT is initialized,
1155                  * update it with result from INT_SRC_OVR parsing
1156                  */
1157                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1158         }
1159 #endif
1160         return;
1161
1162  error0:
1163         disable_acpi();
1164 }
1165
1166 /**
1167  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1168  *
1169  * Switch over the platform to the ACPI mode (if possible).
1170  *
1171  * Doing this too early is generally unsafe, but at the same time it needs to be
1172  * done before all things that really depend on ACPI.  The right spot appears to
1173  * be before finalizing the EFI initialization.
1174  */
1175 void __init acpi_subsystem_init(void)
1176 {
1177         acpi_status status;
1178
1179         if (acpi_disabled)
1180                 return;
1181
1182         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1183         if (ACPI_FAILURE(status)) {
1184                 pr_err("Unable to enable ACPI\n");
1185                 disable_acpi();
1186         } else {
1187                 /*
1188                  * If the system is using ACPI then we can be reasonably
1189                  * confident that any regulators are managed by the firmware
1190                  * so tell the regulator core it has everything it needs to
1191                  * know.
1192                  */
1193                 regulator_has_full_constraints();
1194         }
1195 }
1196
1197 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1198 {
1199         if (event == ACPI_TABLE_EVENT_LOAD)
1200                 acpi_scan_table_notify();
1201
1202         return acpi_sysfs_table_handler(event, table, context);
1203 }
1204
1205 static int __init acpi_bus_init(void)
1206 {
1207         int result;
1208         acpi_status status;
1209
1210         acpi_os_initialize1();
1211
1212         status = acpi_load_tables();
1213         if (ACPI_FAILURE(status)) {
1214                 pr_err("Unable to load the System Description Tables\n");
1215                 goto error1;
1216         }
1217
1218         /*
1219          * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1220          * device is found in the namespace.
1221          *
1222          * This is accomplished by looking for the ECDT table and getting the EC
1223          * parameters out of that.
1224          *
1225          * Do that before calling acpi_initialize_objects() which may trigger EC
1226          * address space accesses.
1227          */
1228         acpi_ec_ecdt_probe();
1229
1230         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1231         if (ACPI_FAILURE(status)) {
1232                 pr_err("Unable to start the ACPI Interpreter\n");
1233                 goto error1;
1234         }
1235
1236         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1237         if (ACPI_FAILURE(status)) {
1238                 pr_err("Unable to initialize ACPI objects\n");
1239                 goto error1;
1240         }
1241
1242         /* Set capability bits for _OSC under processor scope */
1243         acpi_early_processor_osc();
1244
1245         /*
1246          * _OSC method may exist in module level code,
1247          * so it must be run after ACPI_FULL_INITIALIZATION
1248          */
1249         acpi_bus_osc_negotiate_platform_control();
1250         acpi_bus_osc_negotiate_usb_control();
1251
1252         /*
1253          * _PDC control method may load dynamic SSDT tables,
1254          * and we need to install the table handler before that.
1255          */
1256         status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1257
1258         acpi_sysfs_init();
1259
1260         acpi_early_processor_set_pdc();
1261
1262         /*
1263          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1264          * is necessary to enable it as early as possible.
1265          */
1266         acpi_ec_dsdt_probe();
1267
1268         pr_info("Interpreter enabled\n");
1269
1270         /* Initialize sleep structures */
1271         acpi_sleep_init();
1272
1273         /*
1274          * Get the system interrupt model and evaluate \_PIC.
1275          */
1276         result = acpi_bus_init_irq();
1277         if (result)
1278                 goto error1;
1279
1280         /*
1281          * Register the for all standard device notifications.
1282          */
1283         status =
1284             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1285                                         &acpi_bus_notify, NULL);
1286         if (ACPI_FAILURE(status)) {
1287                 pr_err("Unable to register for system notifications\n");
1288                 goto error1;
1289         }
1290
1291         /*
1292          * Create the top ACPI proc directory
1293          */
1294         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1295
1296         result = bus_register(&acpi_bus_type);
1297         if (!result)
1298                 return 0;
1299
1300         /* Mimic structured exception handling */
1301       error1:
1302         acpi_terminate();
1303         return -ENODEV;
1304 }
1305
1306 struct kobject *acpi_kobj;
1307 EXPORT_SYMBOL_GPL(acpi_kobj);
1308
1309 static int __init acpi_init(void)
1310 {
1311         int result;
1312
1313         if (acpi_disabled) {
1314                 pr_info("Interpreter disabled.\n");
1315                 return -ENODEV;
1316         }
1317
1318         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1319         if (!acpi_kobj)
1320                 pr_debug("%s: kset create error\n", __func__);
1321
1322         init_prmt();
1323         result = acpi_bus_init();
1324         if (result) {
1325                 kobject_put(acpi_kobj);
1326                 disable_acpi();
1327                 return result;
1328         }
1329
1330         pci_mmcfg_late_init();
1331         acpi_iort_init();
1332         acpi_scan_init();
1333         acpi_ec_init();
1334         acpi_debugfs_init();
1335         acpi_sleep_proc_init();
1336         acpi_wakeup_device_init();
1337         acpi_debugger_init();
1338         acpi_setup_sb_notify_handler();
1339         acpi_viot_init();
1340         return 0;
1341 }
1342
1343 subsys_initcall(acpi_init);