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_cppc2_support_acked;
 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         /*
 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
 461  * ---------------
 462  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 463  */
 464 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 465 {
 466         struct acpi_device *adev;
 467         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 468         bool hotplug_event = false;
 469
 470         switch (type) {
 471         case ACPI_NOTIFY_BUS_CHECK:
 472                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 473                 hotplug_event = true;
 474                 break;
 475
 476         case ACPI_NOTIFY_DEVICE_CHECK:
 477                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 478                 hotplug_event = true;
 479                 break;
 480
 481         case ACPI_NOTIFY_DEVICE_WAKE:
 482                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 483                 break;
 484
 485         case ACPI_NOTIFY_EJECT_REQUEST:
 486                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 487                 hotplug_event = true;
 488                 break;
 489
 490         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 491                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 492                 /* TBD: Exactly what does 'light' mean? */
 493                 break;
 494
 495         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 496                 acpi_handle_err(handle, "Device cannot be configured due "
 497                                 "to a frequency mismatch\n");
 498                 break;
 499
 500         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 501                 acpi_handle_err(handle, "Device cannot be configured due "
 502                                 "to a bus mode mismatch\n");
 503                 break;
 504
 505         case ACPI_NOTIFY_POWER_FAULT:
 506                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 507                 break;
 508
 509         default:
 510                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 511                 break;
 512         }
 513
 514         adev = acpi_get_acpi_dev(handle);
 515         if (!adev)
 516                 goto err;
 517
 518         if (adev->dev.driver) {
 519                 struct acpi_driver *driver = to_acpi_driver(adev->dev.driver);
 520
 521                 if (driver && driver->ops.notify &&
 522                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 523                         driver->ops.notify(adev, type);
 524         }
 525
 526         if (!hotplug_event) {
 527                 acpi_put_acpi_dev(adev);
 528                 return;
 529         }
 530
 531         if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 532                 return;
 533
 534         acpi_put_acpi_dev(adev);
 535
 536  err:
 537         acpi_evaluate_ost(handle, type, ost_code, NULL);
 538 }
 539
 540 static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
 541 {
 542         struct acpi_device *device = data;
 543         struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
 544
 545         acpi_drv->ops.notify(device, event);
 546 }
 547
 548 static void acpi_notify_device_fixed(void *data)
 549 {
 550         struct acpi_device *device = data;
 551
 552         /* Fixed hardware devices have no handles */
 553         acpi_notify_device(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 554 }
 555
 556 static u32 acpi_device_fixed_event(void *data)
 557 {
 558         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_notify_device_fixed, data);
 559         return ACPI_INTERRUPT_HANDLED;
 560 }
 561
 562 static int acpi_device_install_notify_handler(struct acpi_device *device)
 563 {
 564         acpi_status status;
 565
 566         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 567                 status =
 568                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 569                                                      acpi_device_fixed_event,
 570                                                      device);
 571         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 572                 status =
 573                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 574                                                      acpi_device_fixed_event,
 575                                                      device);
 576         else
 577                 status = acpi_install_notify_handler(device->handle,
 578                                                      ACPI_DEVICE_NOTIFY,
 579                                                      acpi_notify_device,
 580                                                      device);
 581
 582         if (ACPI_FAILURE(status))
 583                 return -EINVAL;
 584         return 0;
 585 }
 586
 587 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 588 {
 589         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 590                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 591                                                 acpi_device_fixed_event);
 592         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 593                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 594                                                 acpi_device_fixed_event);
 595         else
 596                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 597                                            acpi_notify_device);
 598 }
 599
 600 /* Handle events targeting \_SB device (at present only graceful shutdown) */
 601
 602 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 603 #define ACPI_SB_INDICATE_INTERVAL       10000
 604
 605 static void sb_notify_work(struct work_struct *dummy)
 606 {
 607         acpi_handle sb_handle;
 608
 609         orderly_poweroff(true);
 610
 611         /*
 612          * After initiating graceful shutdown, the ACPI spec requires OSPM
 613          * to evaluate _OST method once every 10seconds to indicate that
 614          * the shutdown is in progress
 615          */
 616         acpi_get_handle(NULL, "\\_SB", &sb_handle);
 617         while (1) {
 618                 pr_info("Graceful shutdown in progress.\n");
 619                 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 620                                 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 621                 msleep(ACPI_SB_INDICATE_INTERVAL);
 622         }
 623 }
 624
 625 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 626 {
 627         static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 628
 629         if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 630                 if (!work_busy(&acpi_sb_work))
 631                         schedule_work(&acpi_sb_work);
 632         } else
 633                 pr_warn("event %x is not supported by \\_SB device\n", event);
 634 }
 635
 636 static int __init acpi_setup_sb_notify_handler(void)
 637 {
 638         acpi_handle sb_handle;
 639
 640         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 641                 return -ENXIO;
 642
 643         if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 644                                                 acpi_sb_notify, NULL)))
 645                 return -EINVAL;
 646
 647         return 0;
 648 }
 649
 650 /* --------------------------------------------------------------------------
 651                              Device Matching
 652    -------------------------------------------------------------------------- */
 653
 654 /**
 655  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 656  * @adev:       ACPI device in question
 657  *
 658  * Return: First physical node of ACPI device @adev
 659  */
 660 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 661 {
 662         struct mutex *physical_node_lock = &adev->physical_node_lock;
 663         struct device *phys_dev;
 664
 665         mutex_lock(physical_node_lock);
 666         if (list_empty(&adev->physical_node_list)) {
 667                 phys_dev = NULL;
 668         } else {
 669                 const struct acpi_device_physical_node *node;
 670
 671                 node = list_first_entry(&adev->physical_node_list,
 672                                         struct acpi_device_physical_node, node);
 673
 674                 phys_dev = node->dev;
 675         }
 676         mutex_unlock(physical_node_lock);
 677         return phys_dev;
 678 }
 679 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
 680
 681 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 682                                                       const struct device *dev)
 683 {
 684         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 685
 686         return phys_dev && phys_dev == dev ? adev : NULL;
 687 }
 688
 689 /**
 690  * acpi_device_is_first_physical_node - Is given dev first physical node
 691  * @adev: ACPI companion device
 692  * @dev: Physical device to check
 693  *
 694  * Function checks if given @dev is the first physical devices attached to
 695  * the ACPI companion device. This distinction is needed in some cases
 696  * where the same companion device is shared between many physical devices.
 697  *
 698  * Note that the caller have to provide valid @adev pointer.
 699  */
 700 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 701                                         const struct device *dev)
 702 {
 703         return !!acpi_primary_dev_companion(adev, dev);
 704 }
 705
 706 /*
 707  * acpi_companion_match() - Can we match via ACPI companion device
 708  * @dev: Device in question
 709  *
 710  * Check if the given device has an ACPI companion and if that companion has
 711  * a valid list of PNP IDs, and if the device is the first (primary) physical
 712  * device associated with it.  Return the companion pointer if that's the case
 713  * or NULL otherwise.
 714  *
 715  * If multiple physical devices are attached to a single ACPI companion, we need
 716  * to be careful.  The usage scenario for this kind of relationship is that all
 717  * of the physical devices in question use resources provided by the ACPI
 718  * companion.  A typical case is an MFD device where all the sub-devices share
 719  * the parent's ACPI companion.  In such cases we can only allow the primary
 720  * (first) physical device to be matched with the help of the companion's PNP
 721  * IDs.
 722  *
 723  * Additional physical devices sharing the ACPI companion can still use
 724  * resources available from it but they will be matched normally using functions
 725  * provided by their bus types (and analogously for their modalias).
 726  */
 727 struct acpi_device *acpi_companion_match(const struct device *dev)
 728 {
 729         struct acpi_device *adev;
 730
 731         adev = ACPI_COMPANION(dev);
 732         if (!adev)
 733                 return NULL;
 734
 735         if (list_empty(&adev->pnp.ids))
 736                 return NULL;
 737
 738         return acpi_primary_dev_companion(adev, dev);
 739 }
 740
 741 /**
 742  * acpi_of_match_device - Match device object using the "compatible" property.
 743  * @adev: ACPI device object to match.
 744  * @of_match_table: List of device IDs to match against.
 745  * @of_id: OF ID if matched
 746  *
 747  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 748  * identifiers and a _DSD object with the "compatible" property, use that
 749  * property to match against the given list of identifiers.
 750  */
 751 static bool acpi_of_match_device(struct acpi_device *adev,
 752                                  const struct of_device_id *of_match_table,
 753                                  const struct of_device_id **of_id)
 754 {
 755         const union acpi_object *of_compatible, *obj;
 756         int i, nval;
 757
 758         if (!adev)
 759                 return false;
 760
 761         of_compatible = adev->data.of_compatible;
 762         if (!of_match_table || !of_compatible)
 763                 return false;
 764
 765         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 766                 nval = of_compatible->package.count;
 767                 obj = of_compatible->package.elements;
 768         } else { /* Must be ACPI_TYPE_STRING. */
 769                 nval = 1;
 770                 obj = of_compatible;
 771         }
 772         /* Now we can look for the driver DT compatible strings */
 773         for (i = 0; i < nval; i++, obj++) {
 774                 const struct of_device_id *id;
 775
 776                 for (id = of_match_table; id->compatible[0]; id++)
 777                         if (!strcasecmp(obj->string.pointer, id->compatible)) {
 778                                 if (of_id)
 779                                         *of_id = id;
 780                                 return true;
 781                         }
 782         }
 783
 784         return false;
 785 }
 786
 787 static bool acpi_of_modalias(struct acpi_device *adev,
 788                              char *modalias, size_t len)
 789 {
 790         const union acpi_object *of_compatible;
 791         const union acpi_object *obj;
 792         const char *str, *chr;
 793
 794         of_compatible = adev->data.of_compatible;
 795         if (!of_compatible)
 796                 return false;
 797
 798         if (of_compatible->type == ACPI_TYPE_PACKAGE)
 799                 obj = of_compatible->package.elements;
 800         else /* Must be ACPI_TYPE_STRING. */
 801                 obj = of_compatible;
 802
 803         str = obj->string.pointer;
 804         chr = strchr(str, ',');
 805         strscpy(modalias, chr ? chr + 1 : str, len);
 806
 807         return true;
 808 }
 809
 810 /**
 811  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 812  * @adev:       ACPI device object to match
 813  * @default_id: ID string to use as default if no compatible string found
 814  * @modalias:   Pointer to buffer that modalias value will be copied into
 815  * @len:        Length of modalias buffer
 816  *
 817  * This is a counterpart of of_modalias_node() for struct acpi_device objects.
 818  * If there is a compatible string for @adev, it will be copied to @modalias
 819  * with the vendor prefix stripped; otherwise, @default_id will be used.
 820  */
 821 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 822                        char *modalias, size_t len)
 823 {
 824         if (!acpi_of_modalias(adev, modalias, len))
 825                 strscpy(modalias, default_id, len);
 826 }
 827 EXPORT_SYMBOL_GPL(acpi_set_modalias);
 828
 829 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 830                                     struct acpi_hardware_id *hwid)
 831 {
 832         int i, msk, byte_shift;
 833         char buf[3];
 834
 835         if (!id->cls)
 836                 return false;
 837
 838         /* Apply class-code bitmask, before checking each class-code byte */
 839         for (i = 1; i <= 3; i++) {
 840                 byte_shift = 8 * (3 - i);
 841                 msk = (id->cls_msk >> byte_shift) & 0xFF;
 842                 if (!msk)
 843                         continue;
 844
 845                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 846                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 847                         return false;
 848         }
 849         return true;
 850 }
 851
 852 static bool __acpi_match_device(struct acpi_device *device,
 853                                 const struct acpi_device_id *acpi_ids,
 854                                 const struct of_device_id *of_ids,
 855                                 const struct acpi_device_id **acpi_id,
 856                                 const struct of_device_id **of_id)
 857 {
 858         const struct acpi_device_id *id;
 859         struct acpi_hardware_id *hwid;
 860
 861         /*
 862          * If the device is not present, it is unnecessary to load device
 863          * driver for it.
 864          */
 865         if (!device || !device->status.present)
 866                 return false;
 867
 868         list_for_each_entry(hwid, &device->pnp.ids, list) {
 869                 /* First, check the ACPI/PNP IDs provided by the caller. */
 870                 if (acpi_ids) {
 871                         for (id = acpi_ids; id->id[0] || id->cls; id++) {
 872                                 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
 873                                         goto out_acpi_match;
 874                                 if (id->cls && __acpi_match_device_cls(id, hwid))
 875                                         goto out_acpi_match;
 876                         }
 877                 }
 878
 879                 /*
 880                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 881                  * "compatible" property if found.
 882                  */
 883                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
 884                         return acpi_of_match_device(device, of_ids, of_id);
 885         }
 886         return false;
 887
 888 out_acpi_match:
 889         if (acpi_id)
 890                 *acpi_id = id;
 891         return true;
 892 }
 893
 894 /**
 895  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 896  * @ids: Array of struct acpi_device_id object to match against.
 897  * @dev: The device structure to match.
 898  *
 899  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 900  * object for that handle and use that object to match against a given list of
 901  * device IDs.
 902  *
 903  * Return a pointer to the first matching ID on success or %NULL on failure.
 904  */
 905 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 906                                                const struct device *dev)
 907 {
 908         const struct acpi_device_id *id = NULL;
 909
 910         __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
 911         return id;
 912 }
 913 EXPORT_SYMBOL_GPL(acpi_match_device);
 914
 915 static const void *acpi_of_device_get_match_data(const struct device *dev)
 916 {
 917         struct acpi_device *adev = ACPI_COMPANION(dev);
 918         const struct of_device_id *match = NULL;
 919
 920         if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
 921                 return NULL;
 922
 923         return match->data;
 924 }
 925
 926 const void *acpi_device_get_match_data(const struct device *dev)
 927 {
 928         const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
 929         const struct acpi_device_id *match;
 930
 931         if (!acpi_ids)
 932                 return acpi_of_device_get_match_data(dev);
 933
 934         match = acpi_match_device(acpi_ids, dev);
 935         if (!match)
 936                 return NULL;
 937
 938         return (const void *)match->driver_data;
 939 }
 940 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 941
 942 int acpi_match_device_ids(struct acpi_device *device,
 943                           const struct acpi_device_id *ids)
 944 {
 945         return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
 946 }
 947 EXPORT_SYMBOL(acpi_match_device_ids);
 948
 949 bool acpi_driver_match_device(struct device *dev,
 950                               const struct device_driver *drv)
 951 {
 952         const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
 953         const struct of_device_id *of_ids = drv->of_match_table;
 954
 955         if (!acpi_ids)
 956                 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);
 957
 958         return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
 959 }
 960 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 961
 962 /* --------------------------------------------------------------------------
 963                               ACPI Driver Management
 964    -------------------------------------------------------------------------- */
 965
 966 /**
 967  * acpi_bus_register_driver - register a driver with the ACPI bus
 968  * @driver: driver being registered
 969  *
 970  * Registers a driver with the ACPI bus.  Searches the namespace for all
 971  * devices that match the driver's criteria and binds.  Returns zero for
 972  * success or a negative error status for failure.
 973  */
 974 int acpi_bus_register_driver(struct acpi_driver *driver)
 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         return driver_register(&driver->drv);
 983 }
 984
 985 EXPORT_SYMBOL(acpi_bus_register_driver);
 986
 987 /**
 988  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 989  * @driver: driver to unregister
 990  *
 991  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 992  * devices that match the driver's criteria and unbinds.
 993  */
 994 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 995 {
 996         driver_unregister(&driver->drv);
 997 }
 998
 999 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1000
1001 /* --------------------------------------------------------------------------
1002                               ACPI Bus operations
1003    -------------------------------------------------------------------------- */
1004
1005 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1006 {
1007         struct acpi_device *acpi_dev = to_acpi_device(dev);
1008         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1009
1010         return acpi_dev->flags.match_driver
1011                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1012 }
1013
1014 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
1015 {
1016         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1017 }
1018
1019 static int acpi_device_probe(struct device *dev)
1020 {
1021         struct acpi_device *acpi_dev = to_acpi_device(dev);
1022         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1023         int ret;
1024
1025         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1026                 return -EINVAL;
1027
1028         if (!acpi_drv->ops.add)
1029                 return -ENOSYS;
1030
1031         ret = acpi_drv->ops.add(acpi_dev);
1032         if (ret)
1033                 return ret;
1034
1035         pr_debug("Driver [%s] successfully bound to device [%s]\n",
1036                  acpi_drv->name, acpi_dev->pnp.bus_id);
1037
1038         if (acpi_drv->ops.notify) {
1039                 ret = acpi_device_install_notify_handler(acpi_dev);
1040                 if (ret) {
1041                         if (acpi_drv->ops.remove)
1042                                 acpi_drv->ops.remove(acpi_dev);
1043
1044                         acpi_dev->driver_data = NULL;
1045                         return ret;
1046                 }
1047         }
1048
1049         pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1050                  acpi_dev->pnp.bus_id);
1051
1052         get_device(dev);
1053         return 0;
1054 }
1055
1056 static void acpi_device_remove(struct device *dev)
1057 {
1058         struct acpi_device *acpi_dev = to_acpi_device(dev);
1059         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1060
1061         if (acpi_drv->ops.notify)
1062                 acpi_device_remove_notify_handler(acpi_dev);
1063
1064         if (acpi_drv->ops.remove)
1065                 acpi_drv->ops.remove(acpi_dev);
1066
1067         acpi_dev->driver_data = NULL;
1068
1069         put_device(dev);
1070 }
1071
1072 struct bus_type acpi_bus_type = {
1073         .name           = "acpi",
1074         .match          = acpi_bus_match,
1075         .probe          = acpi_device_probe,
1076         .remove         = acpi_device_remove,
1077         .uevent         = acpi_device_uevent,
1078 };
1079
1080 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1081 {
1082         return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1083 }
1084 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1085
1086 struct acpi_dev_walk_context {
1087         int (*fn)(struct acpi_device *, void *);
1088         void *data;
1089 };
1090
1091 static int acpi_dev_for_one_check(struct device *dev, void *context)
1092 {
1093         struct acpi_dev_walk_context *adwc = context;
1094
1095         if (dev->bus != &acpi_bus_type)
1096                 return 0;
1097
1098         return adwc->fn(to_acpi_device(dev), adwc->data);
1099 }
1100 EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1101
1102 int acpi_dev_for_each_child(struct acpi_device *adev,
1103                             int (*fn)(struct acpi_device *, void *), void *data)
1104 {
1105         struct acpi_dev_walk_context adwc = {
1106                 .fn = fn,
1107                 .data = data,
1108         };
1109
1110         return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1111 }
1112
1113 int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1114                                     int (*fn)(struct acpi_device *, void *),
1115                                     void *data)
1116 {
1117         struct acpi_dev_walk_context adwc = {
1118                 .fn = fn,
1119                 .data = data,
1120         };
1121
1122         return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
1123 }
1124
1125 /* --------------------------------------------------------------------------
1126                              Initialization/Cleanup
1127    -------------------------------------------------------------------------- */
1128
1129 static int __init acpi_bus_init_irq(void)
1130 {
1131         acpi_status status;
1132         char *message = NULL;
1133
1134
1135         /*
1136          * Let the system know what interrupt model we are using by
1137          * evaluating the \_PIC object, if exists.
1138          */
1139
1140         switch (acpi_irq_model) {
1141         case ACPI_IRQ_MODEL_PIC:
1142                 message = "PIC";
1143                 break;
1144         case ACPI_IRQ_MODEL_IOAPIC:
1145                 message = "IOAPIC";
1146                 break;
1147         case ACPI_IRQ_MODEL_IOSAPIC:
1148                 message = "IOSAPIC";
1149                 break;
1150         case ACPI_IRQ_MODEL_GIC:
1151                 message = "GIC";
1152                 break;
1153         case ACPI_IRQ_MODEL_PLATFORM:
1154                 message = "platform specific model";
1155                 break;
1156         case ACPI_IRQ_MODEL_LPIC:
1157                 message = "LPIC";
1158                 break;
1159         default:
1160                 pr_info("Unknown interrupt routing model\n");
1161                 return -ENODEV;
1162         }
1163
1164         pr_info("Using %s for interrupt routing\n", message);
1165
1166         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1167         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1168                 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1169                 return -ENODEV;
1170         }
1171
1172         return 0;
1173 }
1174
1175 /**
1176  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1177  *
1178  * The ACPI tables are accessible after this, but the handling of events has not
1179  * been initialized and the global lock is not available yet, so AML should not
1180  * be executed at this point.
1181  *
1182  * Doing this before switching the EFI runtime services to virtual mode allows
1183  * the EfiBootServices memory to be freed slightly earlier on boot.
1184  */
1185 void __init acpi_early_init(void)
1186 {
1187         acpi_status status;
1188
1189         if (acpi_disabled)
1190                 return;
1191
1192         pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1193
1194         /* enable workarounds, unless strict ACPI spec. compliance */
1195         if (!acpi_strict)
1196                 acpi_gbl_enable_interpreter_slack = TRUE;
1197
1198         acpi_permanent_mmap = true;
1199
1200 #ifdef CONFIG_X86
1201         /*
1202          * If the machine falls into the DMI check table,
1203          * DSDT will be copied to memory.
1204          * Note that calling dmi_check_system() here on other architectures
1205          * would not be OK because only x86 initializes dmi early enough.
1206          * Thankfully only x86 systems need such quirks for now.
1207          */
1208         dmi_check_system(dsdt_dmi_table);
1209 #endif
1210
1211         status = acpi_reallocate_root_table();
1212         if (ACPI_FAILURE(status)) {
1213                 pr_err("Unable to reallocate ACPI tables\n");
1214                 goto error0;
1215         }
1216
1217         status = acpi_initialize_subsystem();
1218         if (ACPI_FAILURE(status)) {
1219                 pr_err("Unable to initialize the ACPI Interpreter\n");
1220                 goto error0;
1221         }
1222
1223 #ifdef CONFIG_X86
1224         if (!acpi_ioapic) {
1225                 /* compatible (0) means level (3) */
1226                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1227                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1228                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1229                 }
1230                 /* Set PIC-mode SCI trigger type */
1231                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1232                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1233         } else {
1234                 /*
1235                  * now that acpi_gbl_FADT is initialized,
1236                  * update it with result from INT_SRC_OVR parsing
1237                  */
1238                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1239         }
1240 #endif
1241         return;
1242
1243  error0:
1244         disable_acpi();
1245 }
1246
1247 /**
1248  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1249  *
1250  * Switch over the platform to the ACPI mode (if possible).
1251  *
1252  * Doing this too early is generally unsafe, but at the same time it needs to be
1253  * done before all things that really depend on ACPI.  The right spot appears to
1254  * be before finalizing the EFI initialization.
1255  */
1256 void __init acpi_subsystem_init(void)
1257 {
1258         acpi_status status;
1259
1260         if (acpi_disabled)
1261                 return;
1262
1263         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1264         if (ACPI_FAILURE(status)) {
1265                 pr_err("Unable to enable ACPI\n");
1266                 disable_acpi();
1267         } else {
1268                 /*
1269                  * If the system is using ACPI then we can be reasonably
1270                  * confident that any regulators are managed by the firmware
1271                  * so tell the regulator core it has everything it needs to
1272                  * know.
1273                  */
1274                 regulator_has_full_constraints();
1275         }
1276 }
1277
1278 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1279 {
1280         if (event == ACPI_TABLE_EVENT_LOAD)
1281                 acpi_scan_table_notify();
1282
1283         return acpi_sysfs_table_handler(event, table, context);
1284 }
1285
1286 static int __init acpi_bus_init(void)
1287 {
1288         int result;
1289         acpi_status status;
1290
1291         acpi_os_initialize1();
1292
1293         status = acpi_load_tables();
1294         if (ACPI_FAILURE(status)) {
1295                 pr_err("Unable to load the System Description Tables\n");
1296                 goto error1;
1297         }
1298
1299         /*
1300          * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1301          * device is found in the namespace.
1302          *
1303          * This is accomplished by looking for the ECDT table and getting the EC
1304          * parameters out of that.
1305          *
1306          * Do that before calling acpi_initialize_objects() which may trigger EC
1307          * address space accesses.
1308          */
1309         acpi_ec_ecdt_probe();
1310
1311         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1312         if (ACPI_FAILURE(status)) {
1313                 pr_err("Unable to start the ACPI Interpreter\n");
1314                 goto error1;
1315         }
1316
1317         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1318         if (ACPI_FAILURE(status)) {
1319                 pr_err("Unable to initialize ACPI objects\n");
1320                 goto error1;
1321         }
1322
1323         /* Set capability bits for _OSC under processor scope */
1324         acpi_early_processor_osc();
1325
1326         /*
1327          * _OSC method may exist in module level code,
1328          * so it must be run after ACPI_FULL_INITIALIZATION
1329          */
1330         acpi_bus_osc_negotiate_platform_control();
1331         acpi_bus_osc_negotiate_usb_control();
1332
1333         /*
1334          * _PDC control method may load dynamic SSDT tables,
1335          * and we need to install the table handler before that.
1336          */
1337         status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1338
1339         acpi_sysfs_init();
1340
1341         acpi_early_processor_set_pdc();
1342
1343         /*
1344          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1345          * is necessary to enable it as early as possible.
1346          */
1347         acpi_ec_dsdt_probe();
1348
1349         pr_info("Interpreter enabled\n");
1350
1351         /* Initialize sleep structures */
1352         acpi_sleep_init();
1353
1354         /*
1355          * Get the system interrupt model and evaluate \_PIC.
1356          */
1357         result = acpi_bus_init_irq();
1358         if (result)
1359                 goto error1;
1360
1361         /*
1362          * Register the for all standard device notifications.
1363          */
1364         status =
1365             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1366                                         &acpi_bus_notify, NULL);
1367         if (ACPI_FAILURE(status)) {
1368                 pr_err("Unable to register for system notifications\n");
1369                 goto error1;
1370         }
1371
1372         /*
1373          * Create the top ACPI proc directory
1374          */
1375         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1376
1377         result = bus_register(&acpi_bus_type);
1378         if (!result)
1379                 return 0;
1380
1381         /* Mimic structured exception handling */
1382       error1:
1383         acpi_terminate();
1384         return -ENODEV;
1385 }
1386
1387 struct kobject *acpi_kobj;
1388 EXPORT_SYMBOL_GPL(acpi_kobj);
1389
1390 static int __init acpi_init(void)
1391 {
1392         int result;
1393
1394         if (acpi_disabled) {
1395                 pr_info("Interpreter disabled.\n");
1396                 return -ENODEV;
1397         }
1398
1399         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1400         if (!acpi_kobj)
1401                 pr_debug("%s: kset create error\n", __func__);
1402
1403         init_prmt();
1404         acpi_init_pcc();
1405         result = acpi_bus_init();
1406         if (result) {
1407                 kobject_put(acpi_kobj);
1408                 disable_acpi();
1409                 return result;
1410         }
1411
1412         pci_mmcfg_late_init();
1413         acpi_iort_init();
1414         acpi_viot_early_init();
1415         acpi_hest_init();
1416         acpi_ghes_init();
1417         acpi_scan_init();
1418         acpi_ec_init();
1419         acpi_debugfs_init();
1420         acpi_sleep_proc_init();
1421         acpi_wakeup_device_init();
1422         acpi_debugger_init();
1423         acpi_setup_sb_notify_handler();
1424         acpi_viot_init();
1425         acpi_agdi_init();
1426         return 0;
1427 }
1428
1429 subsys_initcall(acpi_init);