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_viot.h>
  30 #include <linux/pci.h>
  31 #include <acpi/apei.h>
  32 #include <linux/suspend.h>
  33 #include <linux/prmt.h>
  34
  35 #include "internal.h"
  36
  37 struct acpi_device *acpi_root;
  38 struct proc_dir_entry *acpi_root_dir;
  39 EXPORT_SYMBOL(acpi_root_dir);
  40
  41 #ifdef CONFIG_X86
  42 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  43 static inline int set_copy_dsdt(const struct dmi_system_id *id)
  44 {
  45         return 0;
  46 }
  47 #else
  48 static int set_copy_dsdt(const struct dmi_system_id *id)
  49 {
  50         pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
  51         acpi_gbl_copy_dsdt_locally = 1;
  52         return 0;
  53 }
  54 #endif
  55
  56 static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
  57         /*
  58          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  59          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  60          */
  61         {
  62          .callback = set_copy_dsdt,
  63          .ident = "TOSHIBA Satellite",
  64          .matches = {
  65                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  66                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  67                 },
  68         },
  69         {}
  70 };
  71 #endif
  72
  73 /* --------------------------------------------------------------------------
  74                                 Device Management
  75    -------------------------------------------------------------------------- */
  76
  77 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  78                                        unsigned long long *sta)
  79 {
  80         acpi_status status;
  81
  82         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  83         if (ACPI_SUCCESS(status))
  84                 return AE_OK;
  85
  86         if (status == AE_NOT_FOUND) {
  87                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
  88                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
  89                 return AE_OK;
  90         }
  91         return status;
  92 }
  93 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
  94
  95 int acpi_bus_get_status(struct acpi_device *device)
  96 {
  97         acpi_status status;
  98         unsigned long long sta;
  99
 100         if (acpi_device_override_status(device, &sta)) {
 101                 acpi_set_device_status(device, sta);
 102                 return 0;
 103         }
 104
 105         /* Battery devices must have their deps met before calling _STA */
 106         if (acpi_device_is_battery(device) && device->dep_unmet) {
 107                 acpi_set_device_status(device, 0);
 108                 return 0;
 109         }
 110
 111         status = acpi_bus_get_status_handle(device->handle, &sta);
 112         if (ACPI_FAILURE(status))
 113                 return -ENODEV;
 114
 115         acpi_set_device_status(device, sta);
 116
 117         if (device->status.functional && !device->status.present) {
 118                 pr_debug("Device [%s] status [%08x]: functional but not present\n",
 119                          device->pnp.bus_id, (u32)sta);
 120         }
 121
 122         pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
 123         return 0;
 124 }
 125 EXPORT_SYMBOL(acpi_bus_get_status);
 126
 127 void acpi_bus_private_data_handler(acpi_handle handle,
 128                                    void *context)
 129 {
 130         return;
 131 }
 132 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 133
 134 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
 135 {
 136         acpi_status status;
 137
 138         status = acpi_attach_data(handle,
 139                         acpi_bus_private_data_handler, data);
 140         if (ACPI_FAILURE(status)) {
 141                 acpi_handle_debug(handle, "Error attaching device data\n");
 142                 return -ENODEV;
 143         }
 144
 145         return 0;
 146 }
 147 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
 148
 149 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 150 {
 151         acpi_status status;
 152
 153         if (!data)
 154                 return -EINVAL;
 155
 156         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 157         if (ACPI_FAILURE(status)) {
 158                 acpi_handle_debug(handle, "No context for object\n");
 159                 return -ENODEV;
 160         }
 161
 162         return 0;
 163 }
 164 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
 165
 166 void acpi_bus_detach_private_data(acpi_handle handle)
 167 {
 168         acpi_detach_data(handle, acpi_bus_private_data_handler);
 169 }
 170 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
 171
 172 static void acpi_print_osc_error(acpi_handle handle,
 173                                  struct acpi_osc_context *context, char *error)
 174 {
 175         int i;
 176
 177         acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
 178
 179         pr_debug("_OSC request data:");
 180         for (i = 0; i < context->cap.length; i += sizeof(u32))
 181                 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
 182
 183         pr_debug("\n");
 184 }
 185
 186 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 187 {
 188         acpi_status status;
 189         struct acpi_object_list input;
 190         union acpi_object in_params[4];
 191         union acpi_object *out_obj;
 192         guid_t guid;
 193         u32 errors;
 194         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 195
 196         if (!context)
 197                 return AE_ERROR;
 198         if (guid_parse(context->uuid_str, &guid))
 199                 return AE_ERROR;
 200         context->ret.length = ACPI_ALLOCATE_BUFFER;
 201         context->ret.pointer = NULL;
 202
 203         /* Setting up input parameters */
 204         input.count = 4;
 205         input.pointer = in_params;
 206         in_params[0].type               = ACPI_TYPE_BUFFER;
 207         in_params[0].buffer.length      = 16;
 208         in_params[0].buffer.pointer     = (u8 *)&guid;
 209         in_params[1].type               = ACPI_TYPE_INTEGER;
 210         in_params[1].integer.value      = context->rev;
 211         in_params[2].type               = ACPI_TYPE_INTEGER;
 212         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 213         in_params[3].type               = ACPI_TYPE_BUFFER;
 214         in_params[3].buffer.length      = context->cap.length;
 215         in_params[3].buffer.pointer     = context->cap.pointer;
 216
 217         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 218         if (ACPI_FAILURE(status))
 219                 return status;
 220
 221         if (!output.length)
 222                 return AE_NULL_OBJECT;
 223
 224         out_obj = output.pointer;
 225         if (out_obj->type != ACPI_TYPE_BUFFER
 226                 || out_obj->buffer.length != context->cap.length) {
 227                 acpi_print_osc_error(handle, context,
 228                         "_OSC evaluation returned wrong type");
 229                 status = AE_TYPE;
 230                 goto out_kfree;
 231         }
 232         /* Need to ignore the bit0 in result code */
 233         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 234         if (errors) {
 235                 if (errors & OSC_REQUEST_ERROR)
 236                         acpi_print_osc_error(handle, context,
 237                                 "_OSC request failed");
 238                 if (errors & OSC_INVALID_UUID_ERROR)
 239                         acpi_print_osc_error(handle, context,
 240                                 "_OSC invalid UUID");
 241                 if (errors & OSC_INVALID_REVISION_ERROR)
 242                         acpi_print_osc_error(handle, context,
 243                                 "_OSC invalid revision");
 244                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 245                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 246                             & OSC_QUERY_ENABLE)
 247                                 goto out_success;
 248                         status = AE_SUPPORT;
 249                         goto out_kfree;
 250                 }
 251                 status = AE_ERROR;
 252                 goto out_kfree;
 253         }
 254 out_success:
 255         context->ret.length = out_obj->buffer.length;
 256         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 257                                        context->ret.length, GFP_KERNEL);
 258         if (!context->ret.pointer) {
 259                 status =  AE_NO_MEMORY;
 260                 goto out_kfree;
 261         }
 262         status =  AE_OK;
 263
 264 out_kfree:
 265         kfree(output.pointer);
 266         return status;
 267 }
 268 EXPORT_SYMBOL(acpi_run_osc);
 269
 270 bool osc_sb_apei_support_acked;
 271
 272 /*
 273  * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
 274  * OSPM supports platform coordinated low power idle(LPI) states
 275  */
 276 bool osc_pc_lpi_support_confirmed;
 277 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
 278
 279 /*
 280  * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
 281  *   Starting with ACPI Specification 6.2, all _CPC registers can be in
 282  *   PCC, System Memory, System IO, or Functional Fixed Hardware address
 283  *   spaces. OSPM support for this more flexible register space scheme is
 284  *   indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.
 285  *
 286  * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
 287  * - PCC or Functional Fixed Hardware address space if defined
 288  * - SystemMemory address space (NULL register) if not defined
 289  */
 290 bool osc_cpc_flexible_adr_space_confirmed;
 291 EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
 292
 293 /*
 294  * ACPI 6.4 Operating System Capabilities for USB.
 295  */
 296 bool osc_sb_native_usb4_support_confirmed;
 297 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
 298
 299 bool osc_sb_cppc2_support_acked;
 300
 301 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 302 static void acpi_bus_osc_negotiate_platform_control(void)
 303 {
 304         u32 capbuf[2], *capbuf_ret;
 305         struct acpi_osc_context context = {
 306                 .uuid_str = sb_uuid_str,
 307                 .rev = 1,
 308                 .cap.length = 8,
 309                 .cap.pointer = capbuf,
 310         };
 311         acpi_handle handle;
 312
 313         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 314         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 315         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
 316                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 317         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 318                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 319
 320         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 321         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
 322         if (IS_ENABLED(CONFIG_ACPI_PRMT))
 323                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
 324         if (IS_ENABLED(CONFIG_ACPI_FFH))
 325                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT;
 326
 327 #ifdef CONFIG_ARM64
 328         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 329 #endif
 330 #ifdef CONFIG_X86
 331         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 332 #endif
 333
 334 #ifdef CONFIG_ACPI_CPPC_LIB
 335         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
 336         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
 337 #endif
 338
 339         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
 340
 341         if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
 342                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
 343
 344         if (IS_ENABLED(CONFIG_USB4))
 345                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
 346
 347         if (!ghes_disable)
 348                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 349         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 350                 return;
 351
 352         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 353                 return;
 354
 355         capbuf_ret = context.ret.pointer;
 356         if (context.ret.length <= OSC_SUPPORT_DWORD) {
 357                 kfree(context.ret.pointer);
 358                 return;
 359         }
 360
 361         /*
 362          * Now run _OSC again with query flag clear and with the caps
 363          * supported by both the OS and the platform.
 364          */
 365         capbuf[OSC_QUERY_DWORD] = 0;
 366         capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
 367         kfree(context.ret.pointer);
 368
 369         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 370                 return;
 371
 372         capbuf_ret = context.ret.pointer;
 373         if (context.ret.length > OSC_SUPPORT_DWORD) {
 374 #ifdef CONFIG_ACPI_CPPC_LIB
 375                 osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;
 376 #endif
 377
 378                 osc_sb_apei_support_acked =
 379                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 380                 osc_pc_lpi_support_confirmed =
 381                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
 382                 osc_sb_native_usb4_support_confirmed =
 383                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
 384                 osc_cpc_flexible_adr_space_confirmed =
 385                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
 386         }
 387
 388         kfree(context.ret.pointer);
 389 }
 390
 391 /*
 392  * Native control of USB4 capabilities. If any of the tunneling bits is
 393  * set it means OS is in control and we use software based connection
 394  * manager.
 395  */
 396 u32 osc_sb_native_usb4_control;
 397 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
 398
 399 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
 400 {
 401         pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
 402                (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
 403                (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
 404                (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
 405                (bits & OSC_USB_XDOMAIN) ? '+' : '-');
 406 }
 407
 408 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
 409 static void acpi_bus_osc_negotiate_usb_control(void)
 410 {
 411         u32 capbuf[3];
 412         struct acpi_osc_context context = {
 413                 .uuid_str = sb_usb_uuid_str,
 414                 .rev = 1,
 415                 .cap.length = sizeof(capbuf),
 416                 .cap.pointer = capbuf,
 417         };
 418         acpi_handle handle;
 419         acpi_status status;
 420         u32 control;
 421
 422         if (!osc_sb_native_usb4_support_confirmed)
 423                 return;
 424
 425         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 426                 return;
 427
 428         control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
 429                   OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
 430
 431         capbuf[OSC_QUERY_DWORD] = 0;
 432         capbuf[OSC_SUPPORT_DWORD] = 0;
 433         capbuf[OSC_CONTROL_DWORD] = control;
 434
 435         status = acpi_run_osc(handle, &context);
 436         if (ACPI_FAILURE(status))
 437                 return;
 438
 439         if (context.ret.length != sizeof(capbuf)) {
 440                 pr_info("USB4 _OSC: returned invalid length buffer\n");
 441                 goto out_free;
 442         }
 443
 444         osc_sb_native_usb4_control =
 445                 control &  acpi_osc_ctx_get_pci_control(&context);
 446
 447         acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
 448         acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
 449                                 osc_sb_native_usb4_control);
 450
 451 out_free:
 452         kfree(context.ret.pointer);
 453 }
 454
 455 /* --------------------------------------------------------------------------
 456                              Notification Handling
 457    -------------------------------------------------------------------------- */
 458
 459 /**
 460  * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler
 461  * @handle: Target ACPI object.
 462  * @type: Notification type.
 463  * @data: Ignored.
 464  *
 465  * This only handles notifications related to device hotplug.
 466  */
 467 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 468 {
 469         struct acpi_device *adev;
 470
 471         switch (type) {
 472         case ACPI_NOTIFY_BUS_CHECK:
 473                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 474                 break;
 475
 476         case ACPI_NOTIFY_DEVICE_CHECK:
 477                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 478                 break;
 479
 480         case ACPI_NOTIFY_DEVICE_WAKE:
 481                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 482                 return;
 483
 484         case ACPI_NOTIFY_EJECT_REQUEST:
 485                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 486                 break;
 487
 488         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 489                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 490                 /* TBD: Exactly what does 'light' mean? */
 491                 return;
 492
 493         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 494                 acpi_handle_err(handle, "Device cannot be configured due "
 495                                 "to a frequency mismatch\n");
 496                 return;
 497
 498         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 499                 acpi_handle_err(handle, "Device cannot be configured due "
 500                                 "to a bus mode mismatch\n");
 501                 return;
 502
 503         case ACPI_NOTIFY_POWER_FAULT:
 504                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 505                 return;
 506
 507         default:
 508                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 509                 return;
 510         }
 511
 512         adev = acpi_get_acpi_dev(handle);
 513
 514         if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 515                 return;
 516
 517         acpi_put_acpi_dev(adev);
 518
 519         acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 520 }
 521
 522 static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
 523 {
 524         struct acpi_device *device = data;
 525         struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
 526
 527         acpi_drv->ops.notify(device, event);
 528 }
 529
 530 static int acpi_device_install_notify_handler(struct acpi_device *device,
 531                                               struct acpi_driver *acpi_drv)
 532 {
 533         u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
 534                                 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
 535         acpi_status status;
 536
 537         status = acpi_install_notify_handler(device->handle, type,
 538                                              acpi_notify_device, device);
 539         if (ACPI_FAILURE(status))
 540                 return -EINVAL;
 541
 542         return 0;
 543 }
 544
 545 static void acpi_device_remove_notify_handler(struct acpi_device *device,
 546                                               struct acpi_driver *acpi_drv)
 547 {
 548         u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
 549                                 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
 550
 551         acpi_remove_notify_handler(device->handle, type,
 552                                    acpi_notify_device);
 553
 554         acpi_os_wait_events_complete();
 555 }
 556
 557 /* Handle events targeting \_SB device (at present only graceful shutdown) */
 558
 559 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 560 #define ACPI_SB_INDICATE_INTERVAL       10000
 561
 562 static void sb_notify_work(struct work_struct *dummy)
 563 {
 564         acpi_handle sb_handle;
 565
 566         orderly_poweroff(true);
 567
 568         /*
 569          * After initiating graceful shutdown, the ACPI spec requires OSPM
 570          * to evaluate _OST method once every 10seconds to indicate that
 571          * the shutdown is in progress
 572          */
 573         acpi_get_handle(NULL, "\\_SB", &sb_handle);
 574         while (1) {
 575                 pr_info("Graceful shutdown in progress.\n");
 576                 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 577                                 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 578                 msleep(ACPI_SB_INDICATE_INTERVAL);
 579         }
 580 }
 581
 582 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 583 {
 584         static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 585
 586         if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 587                 if (!work_busy(&acpi_sb_work))
 588                         schedule_work(&acpi_sb_work);
 589         } else {
 590                 pr_warn("event %x is not supported by \\_SB device\n", event);
 591         }
 592 }
 593
 594 static int __init acpi_setup_sb_notify_handler(void)
 595 {
 596         acpi_handle sb_handle;
 597
 598         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 599                 return -ENXIO;
 600
 601         if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 602                                                 acpi_sb_notify, NULL)))
 603                 return -EINVAL;
 604
 605         return 0;
 606 }
 607
 608 /* --------------------------------------------------------------------------
 609                              Device Matching
 610    -------------------------------------------------------------------------- */
 611
 612 /**
 613  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 614  * @adev:       ACPI device in question
 615  *
 616  * Return: First physical node of ACPI device @adev
 617  */
 618 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 619 {
 620         struct mutex *physical_node_lock = &adev->physical_node_lock;
 621         struct device *phys_dev;
 622
 623         mutex_lock(physical_node_lock);
 624         if (list_empty(&adev->physical_node_list)) {
 625                 phys_dev = NULL;
 626         } else {
 627                 const struct acpi_device_physical_node *node;
 628
 629                 node = list_first_entry(&adev->physical_node_list,
 630                                         struct acpi_device_physical_node, node);
 631
 632                 phys_dev = node->dev;
 633         }
 634         mutex_unlock(physical_node_lock);
 635         return phys_dev;
 636 }
 637 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
 638
 639 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 640                                                       const struct device *dev)
 641 {
 642         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 643
 644         return phys_dev && phys_dev == dev ? adev : NULL;
 645 }
 646
 647 /**
 648  * acpi_device_is_first_physical_node - Is given dev first physical node
 649  * @adev: ACPI companion device
 650  * @dev: Physical device to check
 651  *
 652  * Function checks if given @dev is the first physical devices attached to
 653  * the ACPI companion device. This distinction is needed in some cases
 654  * where the same companion device is shared between many physical devices.
 655  *
 656  * Note that the caller have to provide valid @adev pointer.
 657  */
 658 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 659                                         const struct device *dev)
 660 {
 661         return !!acpi_primary_dev_companion(adev, dev);
 662 }
 663
 664 /*
 665  * acpi_companion_match() - Can we match via ACPI companion device
 666  * @dev: Device in question
 667  *
 668  * Check if the given device has an ACPI companion and if that companion has
 669  * a valid list of PNP IDs, and if the device is the first (primary) physical
 670  * device associated with it.  Return the companion pointer if that's the case
 671  * or NULL otherwise.
 672  *
 673  * If multiple physical devices are attached to a single ACPI companion, we need
 674  * to be careful.  The usage scenario for this kind of relationship is that all
 675  * of the physical devices in question use resources provided by the ACPI
 676  * companion.  A typical case is an MFD device where all the sub-devices share
 677  * the parent's ACPI companion.  In such cases we can only allow the primary
 678  * (first) physical device to be matched with the help of the companion's PNP
 679  * IDs.
 680  *
 681  * Additional physical devices sharing the ACPI companion can still use
 682  * resources available from it but they will be matched normally using functions
 683  * provided by their bus types (and analogously for their modalias).
 684  */
 685 const struct acpi_device *acpi_companion_match(const struct device *dev)
 686 {
 687         struct acpi_device *adev;
 688
 689         adev = ACPI_COMPANION(dev);
 690         if (!adev)
 691                 return NULL;
 692
 693         if (list_empty(&adev->pnp.ids))
 694                 return NULL;
 695
 696         return acpi_primary_dev_companion(adev, dev);
 697 }
 698
 699 /**
 700  * acpi_of_match_device - Match device object using the "compatible" property.
 701  * @adev: ACPI device object to match.
 702  * @of_match_table: List of device IDs to match against.
 703  * @of_id: OF ID if matched
 704  *
 705  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 706  * identifiers and a _DSD object with the "compatible" property, use that
 707  * property to match against the given list of identifiers.
 708  */
 709 static bool acpi_of_match_device(const struct acpi_device *adev,
 710                                  const struct of_device_id *of_match_table,
 711                                  const struct of_device_id **of_id)
 712 {
 713         const union acpi_object *of_compatible, *obj;
 714         int i, nval;
 715
 716         if (!adev)
 717                 return false;
 718
 719         of_compatible = adev->data.of_compatible;
 720         if (!of_match_table || !of_compatible)
 721                 return false;
 722
 723         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 724                 nval = of_compatible->package.count;
 725                 obj = of_compatible->package.elements;
 726         } else { /* Must be ACPI_TYPE_STRING. */
 727                 nval = 1;
 728                 obj = of_compatible;
 729         }
 730         /* Now we can look for the driver DT compatible strings */
 731         for (i = 0; i < nval; i++, obj++) {
 732                 const struct of_device_id *id;
 733
 734                 for (id = of_match_table; id->compatible[0]; id++)
 735                         if (!strcasecmp(obj->string.pointer, id->compatible)) {
 736                                 if (of_id)
 737                                         *of_id = id;
 738                                 return true;
 739                         }
 740         }
 741
 742         return false;
 743 }
 744
 745 static bool acpi_of_modalias(struct acpi_device *adev,
 746                              char *modalias, size_t len)
 747 {
 748         const union acpi_object *of_compatible;
 749         const union acpi_object *obj;
 750         const char *str, *chr;
 751
 752         of_compatible = adev->data.of_compatible;
 753         if (!of_compatible)
 754                 return false;
 755
 756         if (of_compatible->type == ACPI_TYPE_PACKAGE)
 757                 obj = of_compatible->package.elements;
 758         else /* Must be ACPI_TYPE_STRING. */
 759                 obj = of_compatible;
 760
 761         str = obj->string.pointer;
 762         chr = strchr(str, ',');
 763         strscpy(modalias, chr ? chr + 1 : str, len);
 764
 765         return true;
 766 }
 767
 768 /**
 769  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 770  * @adev:       ACPI device object to match
 771  * @default_id: ID string to use as default if no compatible string found
 772  * @modalias:   Pointer to buffer that modalias value will be copied into
 773  * @len:        Length of modalias buffer
 774  *
 775  * This is a counterpart of of_alias_from_compatible() for struct acpi_device
 776  * objects. If there is a compatible string for @adev, it will be copied to
 777  * @modalias with the vendor prefix stripped; otherwise, @default_id will be
 778  * 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                 strscpy(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(const 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_acpi_device - Match an ACPI device against a given list of ACPI IDs
 855  * @ids: Array of struct acpi_device_id objects to match against.
 856  * @adev: The ACPI device pointer to match.
 857  *
 858  * Match the ACPI device @adev against a given list of ACPI IDs @ids.
 859  *
 860  * Return:
 861  * a pointer to the first matching ACPI ID on success or %NULL on failure.
 862  */
 863 const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,
 864                                                     const struct acpi_device *adev)
 865 {
 866         const struct acpi_device_id *id = NULL;
 867
 868         __acpi_match_device(adev, ids, NULL, &id, NULL);
 869         return id;
 870 }
 871 EXPORT_SYMBOL_GPL(acpi_match_acpi_device);
 872
 873 /**
 874  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 875  * @ids: Array of struct acpi_device_id object to match against.
 876  * @dev: The device structure to match.
 877  *
 878  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 879  * object for that handle and use that object to match against a given list of
 880  * device IDs.
 881  *
 882  * Return a pointer to the first matching ID on success or %NULL on failure.
 883  */
 884 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 885                                                const struct device *dev)
 886 {
 887         return acpi_match_acpi_device(ids, acpi_companion_match(dev));
 888 }
 889 EXPORT_SYMBOL_GPL(acpi_match_device);
 890
 891 static const void *acpi_of_device_get_match_data(const struct device *dev)
 892 {
 893         struct acpi_device *adev = ACPI_COMPANION(dev);
 894         const struct of_device_id *match = NULL;
 895
 896         if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
 897                 return NULL;
 898
 899         return match->data;
 900 }
 901
 902 const void *acpi_device_get_match_data(const struct device *dev)
 903 {
 904         const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
 905         const struct acpi_device_id *match;
 906
 907         if (!acpi_ids)
 908                 return acpi_of_device_get_match_data(dev);
 909
 910         match = acpi_match_device(acpi_ids, dev);
 911         if (!match)
 912                 return NULL;
 913
 914         return (const void *)match->driver_data;
 915 }
 916 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 917
 918 int acpi_match_device_ids(struct acpi_device *device,
 919                           const struct acpi_device_id *ids)
 920 {
 921         return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
 922 }
 923 EXPORT_SYMBOL(acpi_match_device_ids);
 924
 925 bool acpi_driver_match_device(struct device *dev,
 926                               const struct device_driver *drv)
 927 {
 928         const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
 929         const struct of_device_id *of_ids = drv->of_match_table;
 930
 931         if (!acpi_ids)
 932                 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);
 933
 934         return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
 935 }
 936 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 937
 938 /* --------------------------------------------------------------------------
 939                               ACPI Driver Management
 940    -------------------------------------------------------------------------- */
 941
 942 /**
 943  * acpi_bus_register_driver - register a driver with the ACPI bus
 944  * @driver: driver being registered
 945  *
 946  * Registers a driver with the ACPI bus.  Searches the namespace for all
 947  * devices that match the driver's criteria and binds.  Returns zero for
 948  * success or a negative error status for failure.
 949  */
 950 int acpi_bus_register_driver(struct acpi_driver *driver)
 951 {
 952         if (acpi_disabled)
 953                 return -ENODEV;
 954         driver->drv.name = driver->name;
 955         driver->drv.bus = &acpi_bus_type;
 956         driver->drv.owner = driver->owner;
 957
 958         return driver_register(&driver->drv);
 959 }
 960
 961 EXPORT_SYMBOL(acpi_bus_register_driver);
 962
 963 /**
 964  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 965  * @driver: driver to unregister
 966  *
 967  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 968  * devices that match the driver's criteria and unbinds.
 969  */
 970 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 971 {
 972         driver_unregister(&driver->drv);
 973 }
 974
 975 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 976
 977 /* --------------------------------------------------------------------------
 978                               ACPI Bus operations
 979    -------------------------------------------------------------------------- */
 980
 981 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 982 {
 983         struct acpi_device *acpi_dev = to_acpi_device(dev);
 984         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 985
 986         return acpi_dev->flags.match_driver
 987                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 988 }
 989
 990 static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
 991 {
 992         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
 993 }
 994
 995 static int acpi_device_probe(struct device *dev)
 996 {
 997         struct acpi_device *acpi_dev = to_acpi_device(dev);
 998         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 999         int ret;
1000
1001         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1002                 return -EINVAL;
1003
1004         if (!acpi_drv->ops.add)
1005                 return -ENOSYS;
1006
1007         ret = acpi_drv->ops.add(acpi_dev);
1008         if (ret)
1009                 return ret;
1010
1011         pr_debug("Driver [%s] successfully bound to device [%s]\n",
1012                  acpi_drv->name, acpi_dev->pnp.bus_id);
1013
1014         if (acpi_drv->ops.notify) {
1015                 ret = acpi_device_install_notify_handler(acpi_dev, acpi_drv);
1016                 if (ret) {
1017                         if (acpi_drv->ops.remove)
1018                                 acpi_drv->ops.remove(acpi_dev);
1019
1020                         acpi_dev->driver_data = NULL;
1021                         return ret;
1022                 }
1023         }
1024
1025         pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1026                  acpi_dev->pnp.bus_id);
1027
1028         get_device(dev);
1029         return 0;
1030 }
1031
1032 static void acpi_device_remove(struct device *dev)
1033 {
1034         struct acpi_device *acpi_dev = to_acpi_device(dev);
1035         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1036
1037         if (acpi_drv->ops.notify)
1038                 acpi_device_remove_notify_handler(acpi_dev, acpi_drv);
1039
1040         if (acpi_drv->ops.remove)
1041                 acpi_drv->ops.remove(acpi_dev);
1042
1043         acpi_dev->driver_data = NULL;
1044
1045         put_device(dev);
1046 }
1047
1048 struct bus_type acpi_bus_type = {
1049         .name           = "acpi",
1050         .match          = acpi_bus_match,
1051         .probe          = acpi_device_probe,
1052         .remove         = acpi_device_remove,
1053         .uevent         = acpi_device_uevent,
1054 };
1055
1056 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1057 {
1058         return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1059 }
1060 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1061
1062 struct acpi_dev_walk_context {
1063         int (*fn)(struct acpi_device *, void *);
1064         void *data;
1065 };
1066
1067 static int acpi_dev_for_one_check(struct device *dev, void *context)
1068 {
1069         struct acpi_dev_walk_context *adwc = context;
1070
1071         if (dev->bus != &acpi_bus_type)
1072                 return 0;
1073
1074         return adwc->fn(to_acpi_device(dev), adwc->data);
1075 }
1076 EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1077
1078 int acpi_dev_for_each_child(struct acpi_device *adev,
1079                             int (*fn)(struct acpi_device *, void *), void *data)
1080 {
1081         struct acpi_dev_walk_context adwc = {
1082                 .fn = fn,
1083                 .data = data,
1084         };
1085
1086         return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1087 }
1088
1089 int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1090                                     int (*fn)(struct acpi_device *, void *),
1091                                     void *data)
1092 {
1093         struct acpi_dev_walk_context adwc = {
1094                 .fn = fn,
1095                 .data = data,
1096         };
1097
1098         return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
1099 }
1100
1101 /* --------------------------------------------------------------------------
1102                              Initialization/Cleanup
1103    -------------------------------------------------------------------------- */
1104
1105 static int __init acpi_bus_init_irq(void)
1106 {
1107         acpi_status status;
1108         char *message = NULL;
1109
1110
1111         /*
1112          * Let the system know what interrupt model we are using by
1113          * evaluating the \_PIC object, if exists.
1114          */
1115
1116         switch (acpi_irq_model) {
1117         case ACPI_IRQ_MODEL_PIC:
1118                 message = "PIC";
1119                 break;
1120         case ACPI_IRQ_MODEL_IOAPIC:
1121                 message = "IOAPIC";
1122                 break;
1123         case ACPI_IRQ_MODEL_IOSAPIC:
1124                 message = "IOSAPIC";
1125                 break;
1126         case ACPI_IRQ_MODEL_GIC:
1127                 message = "GIC";
1128                 break;
1129         case ACPI_IRQ_MODEL_PLATFORM:
1130                 message = "platform specific model";
1131                 break;
1132         case ACPI_IRQ_MODEL_LPIC:
1133                 message = "LPIC";
1134                 break;
1135         default:
1136                 pr_info("Unknown interrupt routing model\n");
1137                 return -ENODEV;
1138         }
1139
1140         pr_info("Using %s for interrupt routing\n", message);
1141
1142         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1143         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1144                 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1145                 return -ENODEV;
1146         }
1147
1148         return 0;
1149 }
1150
1151 /**
1152  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1153  *
1154  * The ACPI tables are accessible after this, but the handling of events has not
1155  * been initialized and the global lock is not available yet, so AML should not
1156  * be executed at this point.
1157  *
1158  * Doing this before switching the EFI runtime services to virtual mode allows
1159  * the EfiBootServices memory to be freed slightly earlier on boot.
1160  */
1161 void __init acpi_early_init(void)
1162 {
1163         acpi_status status;
1164
1165         if (acpi_disabled)
1166                 return;
1167
1168         pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1169
1170         /* enable workarounds, unless strict ACPI spec. compliance */
1171         if (!acpi_strict)
1172                 acpi_gbl_enable_interpreter_slack = TRUE;
1173
1174         acpi_permanent_mmap = true;
1175
1176 #ifdef CONFIG_X86
1177         /*
1178          * If the machine falls into the DMI check table,
1179          * DSDT will be copied to memory.
1180          * Note that calling dmi_check_system() here on other architectures
1181          * would not be OK because only x86 initializes dmi early enough.
1182          * Thankfully only x86 systems need such quirks for now.
1183          */
1184         dmi_check_system(dsdt_dmi_table);
1185 #endif
1186
1187         status = acpi_reallocate_root_table();
1188         if (ACPI_FAILURE(status)) {
1189                 pr_err("Unable to reallocate ACPI tables\n");
1190                 goto error0;
1191         }
1192
1193         status = acpi_initialize_subsystem();
1194         if (ACPI_FAILURE(status)) {
1195                 pr_err("Unable to initialize the ACPI Interpreter\n");
1196                 goto error0;
1197         }
1198
1199 #ifdef CONFIG_X86
1200         if (!acpi_ioapic) {
1201                 /* compatible (0) means level (3) */
1202                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1203                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1204                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1205                 }
1206                 /* Set PIC-mode SCI trigger type */
1207                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1208                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1209         } else {
1210                 /*
1211                  * now that acpi_gbl_FADT is initialized,
1212                  * update it with result from INT_SRC_OVR parsing
1213                  */
1214                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1215         }
1216 #endif
1217         return;
1218
1219  error0:
1220         disable_acpi();
1221 }
1222
1223 /**
1224  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1225  *
1226  * Switch over the platform to the ACPI mode (if possible).
1227  *
1228  * Doing this too early is generally unsafe, but at the same time it needs to be
1229  * done before all things that really depend on ACPI.  The right spot appears to
1230  * be before finalizing the EFI initialization.
1231  */
1232 void __init acpi_subsystem_init(void)
1233 {
1234         acpi_status status;
1235
1236         if (acpi_disabled)
1237                 return;
1238
1239         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1240         if (ACPI_FAILURE(status)) {
1241                 pr_err("Unable to enable ACPI\n");
1242                 disable_acpi();
1243         } else {
1244                 /*
1245                  * If the system is using ACPI then we can be reasonably
1246                  * confident that any regulators are managed by the firmware
1247                  * so tell the regulator core it has everything it needs to
1248                  * know.
1249                  */
1250                 regulator_has_full_constraints();
1251         }
1252 }
1253
1254 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1255 {
1256         if (event == ACPI_TABLE_EVENT_LOAD)
1257                 acpi_scan_table_notify();
1258
1259         return acpi_sysfs_table_handler(event, table, context);
1260 }
1261
1262 static int __init acpi_bus_init(void)
1263 {
1264         int result;
1265         acpi_status status;
1266
1267         acpi_os_initialize1();
1268
1269         status = acpi_load_tables();
1270         if (ACPI_FAILURE(status)) {
1271                 pr_err("Unable to load the System Description Tables\n");
1272                 goto error1;
1273         }
1274
1275         /*
1276          * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1277          * device is found in the namespace.
1278          *
1279          * This is accomplished by looking for the ECDT table and getting the EC
1280          * parameters out of that.
1281          *
1282          * Do that before calling acpi_initialize_objects() which may trigger EC
1283          * address space accesses.
1284          */
1285         acpi_ec_ecdt_probe();
1286
1287         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1288         if (ACPI_FAILURE(status)) {
1289                 pr_err("Unable to start the ACPI Interpreter\n");
1290                 goto error1;
1291         }
1292
1293         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1294         if (ACPI_FAILURE(status)) {
1295                 pr_err("Unable to initialize ACPI objects\n");
1296                 goto error1;
1297         }
1298
1299         /* Set capability bits for _OSC under processor scope */
1300         acpi_early_processor_osc();
1301
1302         /*
1303          * _OSC method may exist in module level code,
1304          * so it must be run after ACPI_FULL_INITIALIZATION
1305          */
1306         acpi_bus_osc_negotiate_platform_control();
1307         acpi_bus_osc_negotiate_usb_control();
1308
1309         /*
1310          * _PDC control method may load dynamic SSDT tables,
1311          * and we need to install the table handler before that.
1312          */
1313         status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1314
1315         acpi_sysfs_init();
1316
1317         acpi_early_processor_set_pdc();
1318
1319         /*
1320          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1321          * is necessary to enable it as early as possible.
1322          */
1323         acpi_ec_dsdt_probe();
1324
1325         pr_info("Interpreter enabled\n");
1326
1327         /* Initialize sleep structures */
1328         acpi_sleep_init();
1329
1330         /*
1331          * Get the system interrupt model and evaluate \_PIC.
1332          */
1333         result = acpi_bus_init_irq();
1334         if (result)
1335                 goto error1;
1336
1337         /*
1338          * Register the for all standard device notifications.
1339          */
1340         status =
1341             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1342                                         &acpi_bus_notify, NULL);
1343         if (ACPI_FAILURE(status)) {
1344                 pr_err("Unable to register for system notifications\n");
1345                 goto error1;
1346         }
1347
1348         /*
1349          * Create the top ACPI proc directory
1350          */
1351         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1352
1353         result = bus_register(&acpi_bus_type);
1354         if (!result)
1355                 return 0;
1356
1357         /* Mimic structured exception handling */
1358       error1:
1359         acpi_terminate();
1360         return -ENODEV;
1361 }
1362
1363 struct kobject *acpi_kobj;
1364 EXPORT_SYMBOL_GPL(acpi_kobj);
1365
1366 static int __init acpi_init(void)
1367 {
1368         int result;
1369
1370         if (acpi_disabled) {
1371                 pr_info("Interpreter disabled.\n");
1372                 return -ENODEV;
1373         }
1374
1375         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1376         if (!acpi_kobj)
1377                 pr_debug("%s: kset create error\n", __func__);
1378
1379         init_prmt();
1380         acpi_init_pcc();
1381         result = acpi_bus_init();
1382         if (result) {
1383                 kobject_put(acpi_kobj);
1384                 disable_acpi();
1385                 return result;
1386         }
1387         acpi_init_ffh();
1388
1389         pci_mmcfg_late_init();
1390         acpi_arm_init();
1391         acpi_viot_early_init();
1392         acpi_hest_init();
1393         acpi_ghes_init();
1394         acpi_scan_init();
1395         acpi_ec_init();
1396         acpi_debugfs_init();
1397         acpi_sleep_proc_init();
1398         acpi_wakeup_device_init();
1399         acpi_debugger_init();
1400         acpi_setup_sb_notify_handler();
1401         acpi_viot_init();
1402         return 0;
1403 }
1404
1405 subsys_initcall(acpi_init);