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_agdi.h>
  30 #include <linux/acpi_iort.h>
  31 #include <linux/acpi_viot.h>
  32 #include <linux/pci.h>
  33 #include <acpi/apei.h>
  34 #include <linux/suspend.h>
  35 #include <linux/prmt.h>
  36
  37 #include "internal.h"
  38
  39 struct acpi_device *acpi_root;
  40 struct proc_dir_entry *acpi_root_dir;
  41 EXPORT_SYMBOL(acpi_root_dir);
  42
  43 #ifdef CONFIG_X86
  44 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  45 static inline int set_copy_dsdt(const struct dmi_system_id *id)
  46 {
  47         return 0;
  48 }
  49 #else
  50 static int set_copy_dsdt(const struct dmi_system_id *id)
  51 {
  52         pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
  53         acpi_gbl_copy_dsdt_locally = 1;
  54         return 0;
  55 }
  56 #endif
  57
  58 static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
  59         /*
  60          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  61          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  62          */
  63         {
  64          .callback = set_copy_dsdt,
  65          .ident = "TOSHIBA Satellite",
  66          .matches = {
  67                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  68                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  69                 },
  70         },
  71         {}
  72 };
  73 #endif
  74
  75 /* --------------------------------------------------------------------------
  76                                 Device Management
  77    -------------------------------------------------------------------------- */
  78
  79 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  80                                        unsigned long long *sta)
  81 {
  82         acpi_status status;
  83
  84         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  85         if (ACPI_SUCCESS(status))
  86                 return AE_OK;
  87
  88         if (status == AE_NOT_FOUND) {
  89                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
  90                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
  91                 return AE_OK;
  92         }
  93         return status;
  94 }
  95 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
  96
  97 int acpi_bus_get_status(struct acpi_device *device)
  98 {
  99         acpi_status status;
 100         unsigned long long sta;
 101
 102         if (acpi_device_override_status(device, &sta)) {
 103                 acpi_set_device_status(device, sta);
 104                 return 0;
 105         }
 106
 107         /* Battery devices must have their deps met before calling _STA */
 108         if (acpi_device_is_battery(device) && device->dep_unmet) {
 109                 acpi_set_device_status(device, 0);
 110                 return 0;
 111         }
 112
 113         status = acpi_bus_get_status_handle(device->handle, &sta);
 114         if (ACPI_FAILURE(status))
 115                 return -ENODEV;
 116
 117         acpi_set_device_status(device, sta);
 118
 119         if (device->status.functional && !device->status.present) {
 120                 pr_debug("Device [%s] status [%08x]: functional but not present\n",
 121                          device->pnp.bus_id, (u32)sta);
 122         }
 123
 124         pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
 125         return 0;
 126 }
 127 EXPORT_SYMBOL(acpi_bus_get_status);
 128
 129 void acpi_bus_private_data_handler(acpi_handle handle,
 130                                    void *context)
 131 {
 132         return;
 133 }
 134 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 135
 136 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
 137 {
 138         acpi_status status;
 139
 140         status = acpi_attach_data(handle,
 141                         acpi_bus_private_data_handler, data);
 142         if (ACPI_FAILURE(status)) {
 143                 acpi_handle_debug(handle, "Error attaching device data\n");
 144                 return -ENODEV;
 145         }
 146
 147         return 0;
 148 }
 149 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
 150
 151 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 152 {
 153         acpi_status status;
 154
 155         if (!data)
 156                 return -EINVAL;
 157
 158         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 159         if (ACPI_FAILURE(status)) {
 160                 acpi_handle_debug(handle, "No context for object\n");
 161                 return -ENODEV;
 162         }
 163
 164         return 0;
 165 }
 166 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
 167
 168 void acpi_bus_detach_private_data(acpi_handle handle)
 169 {
 170         acpi_detach_data(handle, acpi_bus_private_data_handler);
 171 }
 172 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
 173
 174 static void acpi_print_osc_error(acpi_handle handle,
 175                                  struct acpi_osc_context *context, char *error)
 176 {
 177         int i;
 178
 179         acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
 180
 181         pr_debug("_OSC request data:");
 182         for (i = 0; i < context->cap.length; i += sizeof(u32))
 183                 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
 184
 185         pr_debug("\n");
 186 }
 187
 188 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 189 {
 190         acpi_status status;
 191         struct acpi_object_list input;
 192         union acpi_object in_params[4];
 193         union acpi_object *out_obj;
 194         guid_t guid;
 195         u32 errors;
 196         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 197
 198         if (!context)
 199                 return AE_ERROR;
 200         if (guid_parse(context->uuid_str, &guid))
 201                 return AE_ERROR;
 202         context->ret.length = ACPI_ALLOCATE_BUFFER;
 203         context->ret.pointer = NULL;
 204
 205         /* Setting up input parameters */
 206         input.count = 4;
 207         input.pointer = in_params;
 208         in_params[0].type               = ACPI_TYPE_BUFFER;
 209         in_params[0].buffer.length      = 16;
 210         in_params[0].buffer.pointer     = (u8 *)&guid;
 211         in_params[1].type               = ACPI_TYPE_INTEGER;
 212         in_params[1].integer.value      = context->rev;
 213         in_params[2].type               = ACPI_TYPE_INTEGER;
 214         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 215         in_params[3].type               = ACPI_TYPE_BUFFER;
 216         in_params[3].buffer.length      = context->cap.length;
 217         in_params[3].buffer.pointer     = context->cap.pointer;
 218
 219         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 220         if (ACPI_FAILURE(status))
 221                 return status;
 222
 223         if (!output.length)
 224                 return AE_NULL_OBJECT;
 225
 226         out_obj = output.pointer;
 227         if (out_obj->type != ACPI_TYPE_BUFFER
 228                 || out_obj->buffer.length != context->cap.length) {
 229                 acpi_print_osc_error(handle, context,
 230                         "_OSC evaluation returned wrong type");
 231                 status = AE_TYPE;
 232                 goto out_kfree;
 233         }
 234         /* Need to ignore the bit0 in result code */
 235         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 236         if (errors) {
 237                 if (errors & OSC_REQUEST_ERROR)
 238                         acpi_print_osc_error(handle, context,
 239                                 "_OSC request failed");
 240                 if (errors & OSC_INVALID_UUID_ERROR)
 241                         acpi_print_osc_error(handle, context,
 242                                 "_OSC invalid UUID");
 243                 if (errors & OSC_INVALID_REVISION_ERROR)
 244                         acpi_print_osc_error(handle, context,
 245                                 "_OSC invalid revision");
 246                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 247                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 248                             & OSC_QUERY_ENABLE)
 249                                 goto out_success;
 250                         status = AE_SUPPORT;
 251                         goto out_kfree;
 252                 }
 253                 status = AE_ERROR;
 254                 goto out_kfree;
 255         }
 256 out_success:
 257         context->ret.length = out_obj->buffer.length;
 258         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 259                                        context->ret.length, GFP_KERNEL);
 260         if (!context->ret.pointer) {
 261                 status =  AE_NO_MEMORY;
 262                 goto out_kfree;
 263         }
 264         status =  AE_OK;
 265
 266 out_kfree:
 267         kfree(output.pointer);
 268         return status;
 269 }
 270 EXPORT_SYMBOL(acpi_run_osc);
 271
 272 bool osc_sb_apei_support_acked;
 273
 274 /*
 275  * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
 276  * OSPM supports platform coordinated low power idle(LPI) states
 277  */
 278 bool osc_pc_lpi_support_confirmed;
 279 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
 280
 281 /*
 282  * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
 283  *   Starting with ACPI Specification 6.2, all _CPC registers can be in
 284  *   PCC, System Memory, System IO, or Functional Fixed Hardware address
 285  *   spaces. OSPM support for this more flexible register space scheme is
 286  *   indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.
 287  *
 288  * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
 289  * - PCC or Functional Fixed Hardware address space if defined
 290  * - SystemMemory address space (NULL register) if not defined
 291  */
 292 bool osc_cpc_flexible_adr_space_confirmed;
 293 EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
 294
 295 /*
 296  * ACPI 6.4 Operating System Capabilities for USB.
 297  */
 298 bool osc_sb_native_usb4_support_confirmed;
 299 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
 300
 301 bool osc_sb_cppc_not_supported;
 302
 303 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 304 static void acpi_bus_osc_negotiate_platform_control(void)
 305 {
 306         u32 capbuf[2], *capbuf_ret;
 307         struct acpi_osc_context context = {
 308                 .uuid_str = sb_uuid_str,
 309                 .rev = 1,
 310                 .cap.length = 8,
 311                 .cap.pointer = capbuf,
 312         };
 313         acpi_handle handle;
 314
 315         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 316         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 317         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
 318                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 319         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 320                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 321
 322         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 323         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
 324         if (IS_ENABLED(CONFIG_ACPI_PRMT))
 325                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_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 #ifdef CONFIG_ACPI_CPPC_LIB
 362         osc_sb_cppc_not_supported = !(capbuf_ret[OSC_SUPPORT_DWORD] &
 363                         (OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT));
 364 #endif
 365
 366         /*
 367          * Now run _OSC again with query flag clear and with the caps
 368          * supported by both the OS and the platform.
 369          */
 370         capbuf[OSC_QUERY_DWORD] = 0;
 371         capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
 372         kfree(context.ret.pointer);
 373
 374         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 375                 return;
 376
 377         capbuf_ret = context.ret.pointer;
 378         if (context.ret.length > OSC_SUPPORT_DWORD) {
 379                 osc_sb_apei_support_acked =
 380                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 381                 osc_pc_lpi_support_confirmed =
 382                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
 383                 osc_sb_native_usb4_support_confirmed =
 384                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
 385                 osc_cpc_flexible_adr_space_confirmed =
 386                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
 387         }
 388
 389         kfree(context.ret.pointer);
 390 }
 391
 392 /*
 393  * Native control of USB4 capabilities. If any of the tunneling bits is
 394  * set it means OS is in control and we use software based connection
 395  * manager.
 396  */
 397 u32 osc_sb_native_usb4_control;
 398 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
 399
 400 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
 401 {
 402         pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
 403                (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
 404                (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
 405                (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
 406                (bits & OSC_USB_XDOMAIN) ? '+' : '-');
 407 }
 408
 409 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
 410 static void acpi_bus_osc_negotiate_usb_control(void)
 411 {
 412         u32 capbuf[3];
 413         struct acpi_osc_context context = {
 414                 .uuid_str = sb_usb_uuid_str,
 415                 .rev = 1,
 416                 .cap.length = sizeof(capbuf),
 417                 .cap.pointer = capbuf,
 418         };
 419         acpi_handle handle;
 420         acpi_status status;
 421         u32 control;
 422
 423         if (!osc_sb_native_usb4_support_confirmed)
 424                 return;
 425
 426         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 427                 return;
 428
 429         control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
 430                   OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
 431
 432         capbuf[OSC_QUERY_DWORD] = 0;
 433         capbuf[OSC_SUPPORT_DWORD] = 0;
 434         capbuf[OSC_CONTROL_DWORD] = control;
 435
 436         status = acpi_run_osc(handle, &context);
 437         if (ACPI_FAILURE(status))
 438                 return;
 439
 440         if (context.ret.length != sizeof(capbuf)) {
 441                 pr_info("USB4 _OSC: returned invalid length buffer\n");
 442                 goto out_free;
 443         }
 444
 445         osc_sb_native_usb4_control =
 446                 control &  acpi_osc_ctx_get_pci_control(&context);
 447
 448         acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
 449         acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
 450                                 osc_sb_native_usb4_control);
 451
 452 out_free:
 453         kfree(context.ret.pointer);
 454 }
 455
 456 /* --------------------------------------------------------------------------
 457                              Notification Handling
 458    -------------------------------------------------------------------------- */
 459
 460 /**
 461  * acpi_bus_notify
 462  * ---------------
 463  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 464  */
 465 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 466 {
 467         struct acpi_device *adev;
 468         struct acpi_driver *driver;
 469         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 470         bool hotplug_event = false;
 471
 472         switch (type) {
 473         case ACPI_NOTIFY_BUS_CHECK:
 474                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 475                 hotplug_event = true;
 476                 break;
 477
 478         case ACPI_NOTIFY_DEVICE_CHECK:
 479                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 480                 hotplug_event = true;
 481                 break;
 482
 483         case ACPI_NOTIFY_DEVICE_WAKE:
 484                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 485                 break;
 486
 487         case ACPI_NOTIFY_EJECT_REQUEST:
 488                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 489                 hotplug_event = true;
 490                 break;
 491
 492         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 493                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 494                 /* TBD: Exactly what does 'light' mean? */
 495                 break;
 496
 497         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 498                 acpi_handle_err(handle, "Device cannot be configured due "
 499                                 "to a frequency mismatch\n");
 500                 break;
 501
 502         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 503                 acpi_handle_err(handle, "Device cannot be configured due "
 504                                 "to a bus mode mismatch\n");
 505                 break;
 506
 507         case ACPI_NOTIFY_POWER_FAULT:
 508                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 509                 break;
 510
 511         default:
 512                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 513                 break;
 514         }
 515
 516         adev = acpi_bus_get_acpi_device(handle);
 517         if (!adev)
 518                 goto err;
 519
 520         driver = adev->driver;
 521         if (driver && driver->ops.notify &&
 522             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 523                 driver->ops.notify(adev, type);
 524
 525         if (!hotplug_event) {
 526                 acpi_bus_put_acpi_device(adev);
 527                 return;
 528         }
 529
 530         if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 531                 return;
 532
 533         acpi_bus_put_acpi_device(adev);
 534
 535  err:
 536         acpi_evaluate_ost(handle, type, ost_code, NULL);
 537 }
 538
 539 static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
 540 {
 541         struct acpi_device *device = data;
 542
 543         device->driver->ops.notify(device, event);
 544 }
 545
 546 static void acpi_notify_device_fixed(void *data)
 547 {
 548         struct acpi_device *device = data;
 549
 550         /* Fixed hardware devices have no handles */
 551         acpi_notify_device(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 552 }
 553
 554 static u32 acpi_device_fixed_event(void *data)
 555 {
 556         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_notify_device_fixed, data);
 557         return ACPI_INTERRUPT_HANDLED;
 558 }
 559
 560 static int acpi_device_install_notify_handler(struct acpi_device *device)
 561 {
 562         acpi_status status;
 563
 564         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 565                 status =
 566                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 567                                                      acpi_device_fixed_event,
 568                                                      device);
 569         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 570                 status =
 571                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 572                                                      acpi_device_fixed_event,
 573                                                      device);
 574         else
 575                 status = acpi_install_notify_handler(device->handle,
 576                                                      ACPI_DEVICE_NOTIFY,
 577                                                      acpi_notify_device,
 578                                                      device);
 579
 580         if (ACPI_FAILURE(status))
 581                 return -EINVAL;
 582         return 0;
 583 }
 584
 585 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 586 {
 587         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 588                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 589                                                 acpi_device_fixed_event);
 590         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 591                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 592                                                 acpi_device_fixed_event);
 593         else
 594                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 595                                            acpi_notify_device);
 596 }
 597
 598 /* Handle events targeting \_SB device (at present only graceful shutdown) */
 599
 600 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 601 #define ACPI_SB_INDICATE_INTERVAL       10000
 602
 603 static void sb_notify_work(struct work_struct *dummy)
 604 {
 605         acpi_handle sb_handle;
 606
 607         orderly_poweroff(true);
 608
 609         /*
 610          * After initiating graceful shutdown, the ACPI spec requires OSPM
 611          * to evaluate _OST method once every 10seconds to indicate that
 612          * the shutdown is in progress
 613          */
 614         acpi_get_handle(NULL, "\\_SB", &sb_handle);
 615         while (1) {
 616                 pr_info("Graceful shutdown in progress.\n");
 617                 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 618                                 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 619                 msleep(ACPI_SB_INDICATE_INTERVAL);
 620         }
 621 }
 622
 623 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 624 {
 625         static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 626
 627         if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 628                 if (!work_busy(&acpi_sb_work))
 629                         schedule_work(&acpi_sb_work);
 630         } else
 631                 pr_warn("event %x is not supported by \\_SB device\n", event);
 632 }
 633
 634 static int __init acpi_setup_sb_notify_handler(void)
 635 {
 636         acpi_handle sb_handle;
 637
 638         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 639                 return -ENXIO;
 640
 641         if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 642                                                 acpi_sb_notify, NULL)))
 643                 return -EINVAL;
 644
 645         return 0;
 646 }
 647
 648 /* --------------------------------------------------------------------------
 649                              Device Matching
 650    -------------------------------------------------------------------------- */
 651
 652 /**
 653  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 654  * @adev:       ACPI device in question
 655  *
 656  * Return: First physical node of ACPI device @adev
 657  */
 658 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 659 {
 660         struct mutex *physical_node_lock = &adev->physical_node_lock;
 661         struct device *phys_dev;
 662
 663         mutex_lock(physical_node_lock);
 664         if (list_empty(&adev->physical_node_list)) {
 665                 phys_dev = NULL;
 666         } else {
 667                 const struct acpi_device_physical_node *node;
 668
 669                 node = list_first_entry(&adev->physical_node_list,
 670                                         struct acpi_device_physical_node, node);
 671
 672                 phys_dev = node->dev;
 673         }
 674         mutex_unlock(physical_node_lock);
 675         return phys_dev;
 676 }
 677 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
 678
 679 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 680                                                       const struct device *dev)
 681 {
 682         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 683
 684         return phys_dev && phys_dev == dev ? adev : NULL;
 685 }
 686
 687 /**
 688  * acpi_device_is_first_physical_node - Is given dev first physical node
 689  * @adev: ACPI companion device
 690  * @dev: Physical device to check
 691  *
 692  * Function checks if given @dev is the first physical devices attached to
 693  * the ACPI companion device. This distinction is needed in some cases
 694  * where the same companion device is shared between many physical devices.
 695  *
 696  * Note that the caller have to provide valid @adev pointer.
 697  */
 698 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 699                                         const struct device *dev)
 700 {
 701         return !!acpi_primary_dev_companion(adev, dev);
 702 }
 703
 704 /*
 705  * acpi_companion_match() - Can we match via ACPI companion device
 706  * @dev: Device in question
 707  *
 708  * Check if the given device has an ACPI companion and if that companion has
 709  * a valid list of PNP IDs, and if the device is the first (primary) physical
 710  * device associated with it.  Return the companion pointer if that's the case
 711  * or NULL otherwise.
 712  *
 713  * If multiple physical devices are attached to a single ACPI companion, we need
 714  * to be careful.  The usage scenario for this kind of relationship is that all
 715  * of the physical devices in question use resources provided by the ACPI
 716  * companion.  A typical case is an MFD device where all the sub-devices share
 717  * the parent's ACPI companion.  In such cases we can only allow the primary
 718  * (first) physical device to be matched with the help of the companion's PNP
 719  * IDs.
 720  *
 721  * Additional physical devices sharing the ACPI companion can still use
 722  * resources available from it but they will be matched normally using functions
 723  * provided by their bus types (and analogously for their modalias).
 724  */
 725 struct acpi_device *acpi_companion_match(const struct device *dev)
 726 {
 727         struct acpi_device *adev;
 728
 729         adev = ACPI_COMPANION(dev);
 730         if (!adev)
 731                 return NULL;
 732
 733         if (list_empty(&adev->pnp.ids))
 734                 return NULL;
 735
 736         return acpi_primary_dev_companion(adev, dev);
 737 }
 738
 739 /**
 740  * acpi_of_match_device - Match device object using the "compatible" property.
 741  * @adev: ACPI device object to match.
 742  * @of_match_table: List of device IDs to match against.
 743  * @of_id: OF ID if matched
 744  *
 745  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 746  * identifiers and a _DSD object with the "compatible" property, use that
 747  * property to match against the given list of identifiers.
 748  */
 749 static bool acpi_of_match_device(struct acpi_device *adev,
 750                                  const struct of_device_id *of_match_table,
 751                                  const struct of_device_id **of_id)
 752 {
 753         const union acpi_object *of_compatible, *obj;
 754         int i, nval;
 755
 756         if (!adev)
 757                 return false;
 758
 759         of_compatible = adev->data.of_compatible;
 760         if (!of_match_table || !of_compatible)
 761                 return false;
 762
 763         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 764                 nval = of_compatible->package.count;
 765                 obj = of_compatible->package.elements;
 766         } else { /* Must be ACPI_TYPE_STRING. */
 767                 nval = 1;
 768                 obj = of_compatible;
 769         }
 770         /* Now we can look for the driver DT compatible strings */
 771         for (i = 0; i < nval; i++, obj++) {
 772                 const struct of_device_id *id;
 773
 774                 for (id = of_match_table; id->compatible[0]; id++)
 775                         if (!strcasecmp(obj->string.pointer, id->compatible)) {
 776                                 if (of_id)
 777                                         *of_id = id;
 778                                 return true;
 779                         }
 780         }
 781
 782         return false;
 783 }
 784
 785 static bool acpi_of_modalias(struct acpi_device *adev,
 786                              char *modalias, size_t len)
 787 {
 788         const union acpi_object *of_compatible;
 789         const union acpi_object *obj;
 790         const char *str, *chr;
 791
 792         of_compatible = adev->data.of_compatible;
 793         if (!of_compatible)
 794                 return false;
 795
 796         if (of_compatible->type == ACPI_TYPE_PACKAGE)
 797                 obj = of_compatible->package.elements;
 798         else /* Must be ACPI_TYPE_STRING. */
 799                 obj = of_compatible;
 800
 801         str = obj->string.pointer;
 802         chr = strchr(str, ',');
 803         strlcpy(modalias, chr ? chr + 1 : str, len);
 804
 805         return true;
 806 }
 807
 808 /**
 809  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 810  * @adev:       ACPI device object to match
 811  * @default_id: ID string to use as default if no compatible string found
 812  * @modalias:   Pointer to buffer that modalias value will be copied into
 813  * @len:        Length of modalias buffer
 814  *
 815  * This is a counterpart of of_modalias_node() for struct acpi_device objects.
 816  * If there is a compatible string for @adev, it will be copied to @modalias
 817  * with the vendor prefix stripped; otherwise, @default_id will be used.
 818  */
 819 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 820                        char *modalias, size_t len)
 821 {
 822         if (!acpi_of_modalias(adev, modalias, len))
 823                 strlcpy(modalias, default_id, len);
 824 }
 825 EXPORT_SYMBOL_GPL(acpi_set_modalias);
 826
 827 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 828                                     struct acpi_hardware_id *hwid)
 829 {
 830         int i, msk, byte_shift;
 831         char buf[3];
 832
 833         if (!id->cls)
 834                 return false;
 835
 836         /* Apply class-code bitmask, before checking each class-code byte */
 837         for (i = 1; i <= 3; i++) {
 838                 byte_shift = 8 * (3 - i);
 839                 msk = (id->cls_msk >> byte_shift) & 0xFF;
 840                 if (!msk)
 841                         continue;
 842
 843                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 844                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 845                         return false;
 846         }
 847         return true;
 848 }
 849
 850 static bool __acpi_match_device(struct acpi_device *device,
 851                                 const struct acpi_device_id *acpi_ids,
 852                                 const struct of_device_id *of_ids,
 853                                 const struct acpi_device_id **acpi_id,
 854                                 const struct of_device_id **of_id)
 855 {
 856         const struct acpi_device_id *id;
 857         struct acpi_hardware_id *hwid;
 858
 859         /*
 860          * If the device is not present, it is unnecessary to load device
 861          * driver for it.
 862          */
 863         if (!device || !device->status.present)
 864                 return false;
 865
 866         list_for_each_entry(hwid, &device->pnp.ids, list) {
 867                 /* First, check the ACPI/PNP IDs provided by the caller. */
 868                 if (acpi_ids) {
 869                         for (id = acpi_ids; id->id[0] || id->cls; id++) {
 870                                 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
 871                                         goto out_acpi_match;
 872                                 if (id->cls && __acpi_match_device_cls(id, hwid))
 873                                         goto out_acpi_match;
 874                         }
 875                 }
 876
 877                 /*
 878                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 879                  * "compatible" property if found.
 880                  */
 881                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
 882                         return acpi_of_match_device(device, of_ids, of_id);
 883         }
 884         return false;
 885
 886 out_acpi_match:
 887         if (acpi_id)
 888                 *acpi_id = id;
 889         return true;
 890 }
 891
 892 /**
 893  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 894  * @ids: Array of struct acpi_device_id object to match against.
 895  * @dev: The device structure to match.
 896  *
 897  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 898  * object for that handle and use that object to match against a given list of
 899  * device IDs.
 900  *
 901  * Return a pointer to the first matching ID on success or %NULL on failure.
 902  */
 903 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 904                                                const struct device *dev)
 905 {
 906         const struct acpi_device_id *id = NULL;
 907
 908         __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
 909         return id;
 910 }
 911 EXPORT_SYMBOL_GPL(acpi_match_device);
 912
 913 static const void *acpi_of_device_get_match_data(const struct device *dev)
 914 {
 915         struct acpi_device *adev = ACPI_COMPANION(dev);
 916         const struct of_device_id *match = NULL;
 917
 918         if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
 919                 return NULL;
 920
 921         return match->data;
 922 }
 923
 924 const void *acpi_device_get_match_data(const struct device *dev)
 925 {
 926         const struct acpi_device_id *match;
 927
 928         if (!dev->driver->acpi_match_table)
 929                 return acpi_of_device_get_match_data(dev);
 930
 931         match = acpi_match_device(dev->driver->acpi_match_table, dev);
 932         if (!match)
 933                 return NULL;
 934
 935         return (const void *)match->driver_data;
 936 }
 937 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 938
 939 int acpi_match_device_ids(struct acpi_device *device,
 940                           const struct acpi_device_id *ids)
 941 {
 942         return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
 943 }
 944 EXPORT_SYMBOL(acpi_match_device_ids);
 945
 946 bool acpi_driver_match_device(struct device *dev,
 947                               const struct device_driver *drv)
 948 {
 949         if (!drv->acpi_match_table)
 950                 return acpi_of_match_device(ACPI_COMPANION(dev),
 951                                             drv->of_match_table,
 952                                             NULL);
 953
 954         return __acpi_match_device(acpi_companion_match(dev),
 955                                    drv->acpi_match_table, drv->of_match_table,
 956                                    NULL, NULL);
 957 }
 958 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 959
 960 /* --------------------------------------------------------------------------
 961                               ACPI Driver Management
 962    -------------------------------------------------------------------------- */
 963
 964 /**
 965  * acpi_bus_register_driver - register a driver with the ACPI bus
 966  * @driver: driver being registered
 967  *
 968  * Registers a driver with the ACPI bus.  Searches the namespace for all
 969  * devices that match the driver's criteria and binds.  Returns zero for
 970  * success or a negative error status for failure.
 971  */
 972 int acpi_bus_register_driver(struct acpi_driver *driver)
 973 {
 974         int ret;
 975
 976         if (acpi_disabled)
 977                 return -ENODEV;
 978         driver->drv.name = driver->name;
 979         driver->drv.bus = &acpi_bus_type;
 980         driver->drv.owner = driver->owner;
 981
 982         ret = driver_register(&driver->drv);
 983         return ret;
 984 }
 985
 986 EXPORT_SYMBOL(acpi_bus_register_driver);
 987
 988 /**
 989  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 990  * @driver: driver to unregister
 991  *
 992  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 993  * devices that match the driver's criteria and unbinds.
 994  */
 995 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 996 {
 997         driver_unregister(&driver->drv);
 998 }
 999
1000 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1001
1002 /* --------------------------------------------------------------------------
1003                               ACPI Bus operations
1004    -------------------------------------------------------------------------- */
1005
1006 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1007 {
1008         struct acpi_device *acpi_dev = to_acpi_device(dev);
1009         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1010
1011         return acpi_dev->flags.match_driver
1012                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1013 }
1014
1015 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
1016 {
1017         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1018 }
1019
1020 static int acpi_device_probe(struct device *dev)
1021 {
1022         struct acpi_device *acpi_dev = to_acpi_device(dev);
1023         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1024         int ret;
1025
1026         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1027                 return -EINVAL;
1028
1029         if (!acpi_drv->ops.add)
1030                 return -ENOSYS;
1031
1032         ret = acpi_drv->ops.add(acpi_dev);
1033         if (ret)
1034                 return ret;
1035
1036         acpi_dev->driver = acpi_drv;
1037
1038         pr_debug("Driver [%s] successfully bound to device [%s]\n",
1039                  acpi_drv->name, acpi_dev->pnp.bus_id);
1040
1041         if (acpi_drv->ops.notify) {
1042                 ret = acpi_device_install_notify_handler(acpi_dev);
1043                 if (ret) {
1044                         if (acpi_drv->ops.remove)
1045                                 acpi_drv->ops.remove(acpi_dev);
1046
1047                         acpi_dev->driver = NULL;
1048                         acpi_dev->driver_data = NULL;
1049                         return ret;
1050                 }
1051         }
1052
1053         pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1054                  acpi_dev->pnp.bus_id);
1055
1056         get_device(dev);
1057         return 0;
1058 }
1059
1060 static void acpi_device_remove(struct device *dev)
1061 {
1062         struct acpi_device *acpi_dev = to_acpi_device(dev);
1063         struct acpi_driver *acpi_drv = acpi_dev->driver;
1064
1065         if (acpi_drv) {
1066                 if (acpi_drv->ops.notify)
1067                         acpi_device_remove_notify_handler(acpi_dev);
1068                 if (acpi_drv->ops.remove)
1069                         acpi_drv->ops.remove(acpi_dev);
1070         }
1071         acpi_dev->driver = NULL;
1072         acpi_dev->driver_data = NULL;
1073
1074         put_device(dev);
1075 }
1076
1077 struct bus_type acpi_bus_type = {
1078         .name           = "acpi",
1079         .match          = acpi_bus_match,
1080         .probe          = acpi_device_probe,
1081         .remove         = acpi_device_remove,
1082         .uevent         = acpi_device_uevent,
1083 };
1084
1085 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1086 {
1087         return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1088 }
1089 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1090
1091 struct acpi_dev_walk_context {
1092         int (*fn)(struct acpi_device *, void *);
1093         void *data;
1094 };
1095
1096 static int acpi_dev_for_one_check(struct device *dev, void *context)
1097 {
1098         struct acpi_dev_walk_context *adwc = context;
1099
1100         if (dev->bus != &acpi_bus_type)
1101                 return 0;
1102
1103         return adwc->fn(to_acpi_device(dev), adwc->data);
1104 }
1105
1106 int acpi_dev_for_each_child(struct acpi_device *adev,
1107                             int (*fn)(struct acpi_device *, void *), void *data)
1108 {
1109         struct acpi_dev_walk_context adwc = {
1110                 .fn = fn,
1111                 .data = data,
1112         };
1113
1114         return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1115 }
1116
1117 /* --------------------------------------------------------------------------
1118                              Initialization/Cleanup
1119    -------------------------------------------------------------------------- */
1120
1121 static int __init acpi_bus_init_irq(void)
1122 {
1123         acpi_status status;
1124         char *message = NULL;
1125
1126
1127         /*
1128          * Let the system know what interrupt model we are using by
1129          * evaluating the \_PIC object, if exists.
1130          */
1131
1132         switch (acpi_irq_model) {
1133         case ACPI_IRQ_MODEL_PIC:
1134                 message = "PIC";
1135                 break;
1136         case ACPI_IRQ_MODEL_IOAPIC:
1137                 message = "IOAPIC";
1138                 break;
1139         case ACPI_IRQ_MODEL_IOSAPIC:
1140                 message = "IOSAPIC";
1141                 break;
1142         case ACPI_IRQ_MODEL_GIC:
1143                 message = "GIC";
1144                 break;
1145         case ACPI_IRQ_MODEL_PLATFORM:
1146                 message = "platform specific model";
1147                 break;
1148         case ACPI_IRQ_MODEL_LPIC:
1149                 message = "LPIC";
1150                 break;
1151         default:
1152                 pr_info("Unknown interrupt routing model\n");
1153                 return -ENODEV;
1154         }
1155
1156         pr_info("Using %s for interrupt routing\n", message);
1157
1158         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1159         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1160                 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1161                 return -ENODEV;
1162         }
1163
1164         return 0;
1165 }
1166
1167 /**
1168  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1169  *
1170  * The ACPI tables are accessible after this, but the handling of events has not
1171  * been initialized and the global lock is not available yet, so AML should not
1172  * be executed at this point.
1173  *
1174  * Doing this before switching the EFI runtime services to virtual mode allows
1175  * the EfiBootServices memory to be freed slightly earlier on boot.
1176  */
1177 void __init acpi_early_init(void)
1178 {
1179         acpi_status status;
1180
1181         if (acpi_disabled)
1182                 return;
1183
1184         pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1185
1186         /* enable workarounds, unless strict ACPI spec. compliance */
1187         if (!acpi_strict)
1188                 acpi_gbl_enable_interpreter_slack = TRUE;
1189
1190         acpi_permanent_mmap = true;
1191
1192 #ifdef CONFIG_X86
1193         /*
1194          * If the machine falls into the DMI check table,
1195          * DSDT will be copied to memory.
1196          * Note that calling dmi_check_system() here on other architectures
1197          * would not be OK because only x86 initializes dmi early enough.
1198          * Thankfully only x86 systems need such quirks for now.
1199          */
1200         dmi_check_system(dsdt_dmi_table);
1201 #endif
1202
1203         status = acpi_reallocate_root_table();
1204         if (ACPI_FAILURE(status)) {
1205                 pr_err("Unable to reallocate ACPI tables\n");
1206                 goto error0;
1207         }
1208
1209         status = acpi_initialize_subsystem();
1210         if (ACPI_FAILURE(status)) {
1211                 pr_err("Unable to initialize the ACPI Interpreter\n");
1212                 goto error0;
1213         }
1214
1215 #ifdef CONFIG_X86
1216         if (!acpi_ioapic) {
1217                 /* compatible (0) means level (3) */
1218                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1219                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1220                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1221                 }
1222                 /* Set PIC-mode SCI trigger type */
1223                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1224                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1225         } else {
1226                 /*
1227                  * now that acpi_gbl_FADT is initialized,
1228                  * update it with result from INT_SRC_OVR parsing
1229                  */
1230                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1231         }
1232 #endif
1233         return;
1234
1235  error0:
1236         disable_acpi();
1237 }
1238
1239 /**
1240  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1241  *
1242  * Switch over the platform to the ACPI mode (if possible).
1243  *
1244  * Doing this too early is generally unsafe, but at the same time it needs to be
1245  * done before all things that really depend on ACPI.  The right spot appears to
1246  * be before finalizing the EFI initialization.
1247  */
1248 void __init acpi_subsystem_init(void)
1249 {
1250         acpi_status status;
1251
1252         if (acpi_disabled)
1253                 return;
1254
1255         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1256         if (ACPI_FAILURE(status)) {
1257                 pr_err("Unable to enable ACPI\n");
1258                 disable_acpi();
1259         } else {
1260                 /*
1261                  * If the system is using ACPI then we can be reasonably
1262                  * confident that any regulators are managed by the firmware
1263                  * so tell the regulator core it has everything it needs to
1264                  * know.
1265                  */
1266                 regulator_has_full_constraints();
1267         }
1268 }
1269
1270 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1271 {
1272         if (event == ACPI_TABLE_EVENT_LOAD)
1273                 acpi_scan_table_notify();
1274
1275         return acpi_sysfs_table_handler(event, table, context);
1276 }
1277
1278 static int __init acpi_bus_init(void)
1279 {
1280         int result;
1281         acpi_status status;
1282
1283         acpi_os_initialize1();
1284
1285         status = acpi_load_tables();
1286         if (ACPI_FAILURE(status)) {
1287                 pr_err("Unable to load the System Description Tables\n");
1288                 goto error1;
1289         }
1290
1291         /*
1292          * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1293          * device is found in the namespace.
1294          *
1295          * This is accomplished by looking for the ECDT table and getting the EC
1296          * parameters out of that.
1297          *
1298          * Do that before calling acpi_initialize_objects() which may trigger EC
1299          * address space accesses.
1300          */
1301         acpi_ec_ecdt_probe();
1302
1303         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1304         if (ACPI_FAILURE(status)) {
1305                 pr_err("Unable to start the ACPI Interpreter\n");
1306                 goto error1;
1307         }
1308
1309         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1310         if (ACPI_FAILURE(status)) {
1311                 pr_err("Unable to initialize ACPI objects\n");
1312                 goto error1;
1313         }
1314
1315         /* Set capability bits for _OSC under processor scope */
1316         acpi_early_processor_osc();
1317
1318         /*
1319          * _OSC method may exist in module level code,
1320          * so it must be run after ACPI_FULL_INITIALIZATION
1321          */
1322         acpi_bus_osc_negotiate_platform_control();
1323         acpi_bus_osc_negotiate_usb_control();
1324
1325         /*
1326          * _PDC control method may load dynamic SSDT tables,
1327          * and we need to install the table handler before that.
1328          */
1329         status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1330
1331         acpi_sysfs_init();
1332
1333         acpi_early_processor_set_pdc();
1334
1335         /*
1336          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1337          * is necessary to enable it as early as possible.
1338          */
1339         acpi_ec_dsdt_probe();
1340
1341         pr_info("Interpreter enabled\n");
1342
1343         /* Initialize sleep structures */
1344         acpi_sleep_init();
1345
1346         /*
1347          * Get the system interrupt model and evaluate \_PIC.
1348          */
1349         result = acpi_bus_init_irq();
1350         if (result)
1351                 goto error1;
1352
1353         /*
1354          * Register the for all standard device notifications.
1355          */
1356         status =
1357             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1358                                         &acpi_bus_notify, NULL);
1359         if (ACPI_FAILURE(status)) {
1360                 pr_err("Unable to register for system notifications\n");
1361                 goto error1;
1362         }
1363
1364         /*
1365          * Create the top ACPI proc directory
1366          */
1367         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1368
1369         result = bus_register(&acpi_bus_type);
1370         if (!result)
1371                 return 0;
1372
1373         /* Mimic structured exception handling */
1374       error1:
1375         acpi_terminate();
1376         return -ENODEV;
1377 }
1378
1379 struct kobject *acpi_kobj;
1380 EXPORT_SYMBOL_GPL(acpi_kobj);
1381
1382 static int __init acpi_init(void)
1383 {
1384         int result;
1385
1386         if (acpi_disabled) {
1387                 pr_info("Interpreter disabled.\n");
1388                 return -ENODEV;
1389         }
1390
1391         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1392         if (!acpi_kobj)
1393                 pr_debug("%s: kset create error\n", __func__);
1394
1395         init_prmt();
1396         acpi_init_pcc();
1397         result = acpi_bus_init();
1398         if (result) {
1399                 kobject_put(acpi_kobj);
1400                 disable_acpi();
1401                 return result;
1402         }
1403
1404         pci_mmcfg_late_init();
1405         acpi_iort_init();
1406         acpi_hest_init();
1407         acpi_ghes_init();
1408         acpi_scan_init();
1409         acpi_ec_init();
1410         acpi_debugfs_init();
1411         acpi_sleep_proc_init();
1412         acpi_wakeup_device_init();
1413         acpi_debugger_init();
1414         acpi_setup_sb_notify_handler();
1415         acpi_viot_init();
1416         acpi_agdi_init();
1417         return 0;
1418 }
1419
1420 subsys_initcall(acpi_init);