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 6.4 Operating System Capabilities for USB.
 283  */
 284 bool osc_sb_native_usb4_support_confirmed;
 285 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
 286
 287 bool osc_sb_cppc_not_supported;
 288
 289 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 290 static void acpi_bus_osc_negotiate_platform_control(void)
 291 {
 292         u32 capbuf[2], *capbuf_ret;
 293         struct acpi_osc_context context = {
 294                 .uuid_str = sb_uuid_str,
 295                 .rev = 1,
 296                 .cap.length = 8,
 297                 .cap.pointer = capbuf,
 298         };
 299         acpi_handle handle;
 300
 301         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 302         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 303         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
 304                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 305         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 306                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 307
 308         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 309         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
 310         if (IS_ENABLED(CONFIG_ACPI_PRMT))
 311                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
 312
 313 #ifdef CONFIG_ARM64
 314         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 315 #endif
 316 #ifdef CONFIG_X86
 317         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 318         if (boot_cpu_has(X86_FEATURE_HWP)) {
 319                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
 320                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
 321         }
 322 #endif
 323
 324         if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
 325                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
 326
 327         if (IS_ENABLED(CONFIG_USB4))
 328                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
 329
 330         if (!ghes_disable)
 331                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 332         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 333                 return;
 334
 335         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 336                 return;
 337
 338         capbuf_ret = context.ret.pointer;
 339         if (context.ret.length <= OSC_SUPPORT_DWORD) {
 340                 kfree(context.ret.pointer);
 341                 return;
 342         }
 343
 344 #ifdef CONFIG_X86
 345         if (boot_cpu_has(X86_FEATURE_HWP))
 346                 osc_sb_cppc_not_supported = !(capbuf_ret[OSC_SUPPORT_DWORD] &
 347                                 (OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT));
 348 #endif
 349
 350         /*
 351          * Now run _OSC again with query flag clear and with the caps
 352          * supported by both the OS and the platform.
 353          */
 354         capbuf[OSC_QUERY_DWORD] = 0;
 355         capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
 356         kfree(context.ret.pointer);
 357
 358         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 359                 return;
 360
 361         capbuf_ret = context.ret.pointer;
 362         if (context.ret.length > OSC_SUPPORT_DWORD) {
 363                 osc_sb_apei_support_acked =
 364                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 365                 osc_pc_lpi_support_confirmed =
 366                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
 367                 osc_sb_native_usb4_support_confirmed =
 368                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
 369         }
 370
 371         kfree(context.ret.pointer);
 372 }
 373
 374 /*
 375  * Native control of USB4 capabilities. If any of the tunneling bits is
 376  * set it means OS is in control and we use software based connection
 377  * manager.
 378  */
 379 u32 osc_sb_native_usb4_control;
 380 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
 381
 382 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
 383 {
 384         pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
 385                (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
 386                (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
 387                (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
 388                (bits & OSC_USB_XDOMAIN) ? '+' : '-');
 389 }
 390
 391 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
 392 static void acpi_bus_osc_negotiate_usb_control(void)
 393 {
 394         u32 capbuf[3];
 395         struct acpi_osc_context context = {
 396                 .uuid_str = sb_usb_uuid_str,
 397                 .rev = 1,
 398                 .cap.length = sizeof(capbuf),
 399                 .cap.pointer = capbuf,
 400         };
 401         acpi_handle handle;
 402         acpi_status status;
 403         u32 control;
 404
 405         if (!osc_sb_native_usb4_support_confirmed)
 406                 return;
 407
 408         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 409                 return;
 410
 411         control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
 412                   OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
 413
 414         capbuf[OSC_QUERY_DWORD] = 0;
 415         capbuf[OSC_SUPPORT_DWORD] = 0;
 416         capbuf[OSC_CONTROL_DWORD] = control;
 417
 418         status = acpi_run_osc(handle, &context);
 419         if (ACPI_FAILURE(status))
 420                 return;
 421
 422         if (context.ret.length != sizeof(capbuf)) {
 423                 pr_info("USB4 _OSC: returned invalid length buffer\n");
 424                 goto out_free;
 425         }
 426
 427         osc_sb_native_usb4_control =
 428                 control & ((u32 *)context.ret.pointer)[OSC_CONTROL_DWORD];
 429
 430         acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
 431         acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
 432                                 osc_sb_native_usb4_control);
 433
 434 out_free:
 435         kfree(context.ret.pointer);
 436 }
 437
 438 /* --------------------------------------------------------------------------
 439                              Notification Handling
 440    -------------------------------------------------------------------------- */
 441
 442 /**
 443  * acpi_bus_notify
 444  * ---------------
 445  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 446  */
 447 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 448 {
 449         struct acpi_device *adev;
 450         struct acpi_driver *driver;
 451         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 452         bool hotplug_event = false;
 453
 454         switch (type) {
 455         case ACPI_NOTIFY_BUS_CHECK:
 456                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 457                 hotplug_event = true;
 458                 break;
 459
 460         case ACPI_NOTIFY_DEVICE_CHECK:
 461                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 462                 hotplug_event = true;
 463                 break;
 464
 465         case ACPI_NOTIFY_DEVICE_WAKE:
 466                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 467                 break;
 468
 469         case ACPI_NOTIFY_EJECT_REQUEST:
 470                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 471                 hotplug_event = true;
 472                 break;
 473
 474         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 475                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 476                 /* TBD: Exactly what does 'light' mean? */
 477                 break;
 478
 479         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 480                 acpi_handle_err(handle, "Device cannot be configured due "
 481                                 "to a frequency mismatch\n");
 482                 break;
 483
 484         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 485                 acpi_handle_err(handle, "Device cannot be configured due "
 486                                 "to a bus mode mismatch\n");
 487                 break;
 488
 489         case ACPI_NOTIFY_POWER_FAULT:
 490                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 491                 break;
 492
 493         default:
 494                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 495                 break;
 496         }
 497
 498         adev = acpi_bus_get_acpi_device(handle);
 499         if (!adev)
 500                 goto err;
 501
 502         driver = adev->driver;
 503         if (driver && driver->ops.notify &&
 504             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 505                 driver->ops.notify(adev, type);
 506
 507         if (!hotplug_event) {
 508                 acpi_bus_put_acpi_device(adev);
 509                 return;
 510         }
 511
 512         if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 513                 return;
 514
 515         acpi_bus_put_acpi_device(adev);
 516
 517  err:
 518         acpi_evaluate_ost(handle, type, ost_code, NULL);
 519 }
 520
 521 static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
 522 {
 523         struct acpi_device *device = data;
 524
 525         device->driver->ops.notify(device, event);
 526 }
 527
 528 static void acpi_notify_device_fixed(void *data)
 529 {
 530         struct acpi_device *device = data;
 531
 532         /* Fixed hardware devices have no handles */
 533         acpi_notify_device(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 534 }
 535
 536 static u32 acpi_device_fixed_event(void *data)
 537 {
 538         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_notify_device_fixed, data);
 539         return ACPI_INTERRUPT_HANDLED;
 540 }
 541
 542 static int acpi_device_install_notify_handler(struct acpi_device *device)
 543 {
 544         acpi_status status;
 545
 546         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 547                 status =
 548                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 549                                                      acpi_device_fixed_event,
 550                                                      device);
 551         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 552                 status =
 553                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 554                                                      acpi_device_fixed_event,
 555                                                      device);
 556         else
 557                 status = acpi_install_notify_handler(device->handle,
 558                                                      ACPI_DEVICE_NOTIFY,
 559                                                      acpi_notify_device,
 560                                                      device);
 561
 562         if (ACPI_FAILURE(status))
 563                 return -EINVAL;
 564         return 0;
 565 }
 566
 567 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 568 {
 569         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 570                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 571                                                 acpi_device_fixed_event);
 572         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 573                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 574                                                 acpi_device_fixed_event);
 575         else
 576                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 577                                            acpi_notify_device);
 578 }
 579
 580 /* Handle events targeting \_SB device (at present only graceful shutdown) */
 581
 582 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 583 #define ACPI_SB_INDICATE_INTERVAL       10000
 584
 585 static void sb_notify_work(struct work_struct *dummy)
 586 {
 587         acpi_handle sb_handle;
 588
 589         orderly_poweroff(true);
 590
 591         /*
 592          * After initiating graceful shutdown, the ACPI spec requires OSPM
 593          * to evaluate _OST method once every 10seconds to indicate that
 594          * the shutdown is in progress
 595          */
 596         acpi_get_handle(NULL, "\\_SB", &sb_handle);
 597         while (1) {
 598                 pr_info("Graceful shutdown in progress.\n");
 599                 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 600                                 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 601                 msleep(ACPI_SB_INDICATE_INTERVAL);
 602         }
 603 }
 604
 605 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 606 {
 607         static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 608
 609         if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 610                 if (!work_busy(&acpi_sb_work))
 611                         schedule_work(&acpi_sb_work);
 612         } else
 613                 pr_warn("event %x is not supported by \\_SB device\n", event);
 614 }
 615
 616 static int __init acpi_setup_sb_notify_handler(void)
 617 {
 618         acpi_handle sb_handle;
 619
 620         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 621                 return -ENXIO;
 622
 623         if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 624                                                 acpi_sb_notify, NULL)))
 625                 return -EINVAL;
 626
 627         return 0;
 628 }
 629
 630 /* --------------------------------------------------------------------------
 631                              Device Matching
 632    -------------------------------------------------------------------------- */
 633
 634 /**
 635  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 636  * @adev:       ACPI device in question
 637  *
 638  * Return: First physical node of ACPI device @adev
 639  */
 640 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 641 {
 642         struct mutex *physical_node_lock = &adev->physical_node_lock;
 643         struct device *phys_dev;
 644
 645         mutex_lock(physical_node_lock);
 646         if (list_empty(&adev->physical_node_list)) {
 647                 phys_dev = NULL;
 648         } else {
 649                 const struct acpi_device_physical_node *node;
 650
 651                 node = list_first_entry(&adev->physical_node_list,
 652                                         struct acpi_device_physical_node, node);
 653
 654                 phys_dev = node->dev;
 655         }
 656         mutex_unlock(physical_node_lock);
 657         return phys_dev;
 658 }
 659 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
 660
 661 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 662                                                       const struct device *dev)
 663 {
 664         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 665
 666         return phys_dev && phys_dev == dev ? adev : NULL;
 667 }
 668
 669 /**
 670  * acpi_device_is_first_physical_node - Is given dev first physical node
 671  * @adev: ACPI companion device
 672  * @dev: Physical device to check
 673  *
 674  * Function checks if given @dev is the first physical devices attached to
 675  * the ACPI companion device. This distinction is needed in some cases
 676  * where the same companion device is shared between many physical devices.
 677  *
 678  * Note that the caller have to provide valid @adev pointer.
 679  */
 680 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 681                                         const struct device *dev)
 682 {
 683         return !!acpi_primary_dev_companion(adev, dev);
 684 }
 685
 686 /*
 687  * acpi_companion_match() - Can we match via ACPI companion device
 688  * @dev: Device in question
 689  *
 690  * Check if the given device has an ACPI companion and if that companion has
 691  * a valid list of PNP IDs, and if the device is the first (primary) physical
 692  * device associated with it.  Return the companion pointer if that's the case
 693  * or NULL otherwise.
 694  *
 695  * If multiple physical devices are attached to a single ACPI companion, we need
 696  * to be careful.  The usage scenario for this kind of relationship is that all
 697  * of the physical devices in question use resources provided by the ACPI
 698  * companion.  A typical case is an MFD device where all the sub-devices share
 699  * the parent's ACPI companion.  In such cases we can only allow the primary
 700  * (first) physical device to be matched with the help of the companion's PNP
 701  * IDs.
 702  *
 703  * Additional physical devices sharing the ACPI companion can still use
 704  * resources available from it but they will be matched normally using functions
 705  * provided by their bus types (and analogously for their modalias).
 706  */
 707 struct acpi_device *acpi_companion_match(const struct device *dev)
 708 {
 709         struct acpi_device *adev;
 710
 711         adev = ACPI_COMPANION(dev);
 712         if (!adev)
 713                 return NULL;
 714
 715         if (list_empty(&adev->pnp.ids))
 716                 return NULL;
 717
 718         return acpi_primary_dev_companion(adev, dev);
 719 }
 720
 721 /**
 722  * acpi_of_match_device - Match device object using the "compatible" property.
 723  * @adev: ACPI device object to match.
 724  * @of_match_table: List of device IDs to match against.
 725  * @of_id: OF ID if matched
 726  *
 727  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 728  * identifiers and a _DSD object with the "compatible" property, use that
 729  * property to match against the given list of identifiers.
 730  */
 731 static bool acpi_of_match_device(struct acpi_device *adev,
 732                                  const struct of_device_id *of_match_table,
 733                                  const struct of_device_id **of_id)
 734 {
 735         const union acpi_object *of_compatible, *obj;
 736         int i, nval;
 737
 738         if (!adev)
 739                 return false;
 740
 741         of_compatible = adev->data.of_compatible;
 742         if (!of_match_table || !of_compatible)
 743                 return false;
 744
 745         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 746                 nval = of_compatible->package.count;
 747                 obj = of_compatible->package.elements;
 748         } else { /* Must be ACPI_TYPE_STRING. */
 749                 nval = 1;
 750                 obj = of_compatible;
 751         }
 752         /* Now we can look for the driver DT compatible strings */
 753         for (i = 0; i < nval; i++, obj++) {
 754                 const struct of_device_id *id;
 755
 756                 for (id = of_match_table; id->compatible[0]; id++)
 757                         if (!strcasecmp(obj->string.pointer, id->compatible)) {
 758                                 if (of_id)
 759                                         *of_id = id;
 760                                 return true;
 761                         }
 762         }
 763
 764         return false;
 765 }
 766
 767 static bool acpi_of_modalias(struct acpi_device *adev,
 768                              char *modalias, size_t len)
 769 {
 770         const union acpi_object *of_compatible;
 771         const union acpi_object *obj;
 772         const char *str, *chr;
 773
 774         of_compatible = adev->data.of_compatible;
 775         if (!of_compatible)
 776                 return false;
 777
 778         if (of_compatible->type == ACPI_TYPE_PACKAGE)
 779                 obj = of_compatible->package.elements;
 780         else /* Must be ACPI_TYPE_STRING. */
 781                 obj = of_compatible;
 782
 783         str = obj->string.pointer;
 784         chr = strchr(str, ',');
 785         strlcpy(modalias, chr ? chr + 1 : str, len);
 786
 787         return true;
 788 }
 789
 790 /**
 791  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 792  * @adev:       ACPI device object to match
 793  * @default_id: ID string to use as default if no compatible string found
 794  * @modalias:   Pointer to buffer that modalias value will be copied into
 795  * @len:        Length of modalias buffer
 796  *
 797  * This is a counterpart of of_modalias_node() for struct acpi_device objects.
 798  * If there is a compatible string for @adev, it will be copied to @modalias
 799  * with the vendor prefix stripped; otherwise, @default_id will be used.
 800  */
 801 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 802                        char *modalias, size_t len)
 803 {
 804         if (!acpi_of_modalias(adev, modalias, len))
 805                 strlcpy(modalias, default_id, len);
 806 }
 807 EXPORT_SYMBOL_GPL(acpi_set_modalias);
 808
 809 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 810                                     struct acpi_hardware_id *hwid)
 811 {
 812         int i, msk, byte_shift;
 813         char buf[3];
 814
 815         if (!id->cls)
 816                 return false;
 817
 818         /* Apply class-code bitmask, before checking each class-code byte */
 819         for (i = 1; i <= 3; i++) {
 820                 byte_shift = 8 * (3 - i);
 821                 msk = (id->cls_msk >> byte_shift) & 0xFF;
 822                 if (!msk)
 823                         continue;
 824
 825                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 826                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 827                         return false;
 828         }
 829         return true;
 830 }
 831
 832 static bool __acpi_match_device(struct acpi_device *device,
 833                                 const struct acpi_device_id *acpi_ids,
 834                                 const struct of_device_id *of_ids,
 835                                 const struct acpi_device_id **acpi_id,
 836                                 const struct of_device_id **of_id)
 837 {
 838         const struct acpi_device_id *id;
 839         struct acpi_hardware_id *hwid;
 840
 841         /*
 842          * If the device is not present, it is unnecessary to load device
 843          * driver for it.
 844          */
 845         if (!device || !device->status.present)
 846                 return false;
 847
 848         list_for_each_entry(hwid, &device->pnp.ids, list) {
 849                 /* First, check the ACPI/PNP IDs provided by the caller. */
 850                 if (acpi_ids) {
 851                         for (id = acpi_ids; id->id[0] || id->cls; id++) {
 852                                 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
 853                                         goto out_acpi_match;
 854                                 if (id->cls && __acpi_match_device_cls(id, hwid))
 855                                         goto out_acpi_match;
 856                         }
 857                 }
 858
 859                 /*
 860                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 861                  * "compatible" property if found.
 862                  */
 863                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
 864                         return acpi_of_match_device(device, of_ids, of_id);
 865         }
 866         return false;
 867
 868 out_acpi_match:
 869         if (acpi_id)
 870                 *acpi_id = id;
 871         return true;
 872 }
 873
 874 /**
 875  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 876  * @ids: Array of struct acpi_device_id object to match against.
 877  * @dev: The device structure to match.
 878  *
 879  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 880  * object for that handle and use that object to match against a given list of
 881  * device IDs.
 882  *
 883  * Return a pointer to the first matching ID on success or %NULL on failure.
 884  */
 885 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 886                                                const struct device *dev)
 887 {
 888         const struct acpi_device_id *id = NULL;
 889
 890         __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
 891         return id;
 892 }
 893 EXPORT_SYMBOL_GPL(acpi_match_device);
 894
 895 static const void *acpi_of_device_get_match_data(const struct device *dev)
 896 {
 897         struct acpi_device *adev = ACPI_COMPANION(dev);
 898         const struct of_device_id *match = NULL;
 899
 900         if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
 901                 return NULL;
 902
 903         return match->data;
 904 }
 905
 906 const void *acpi_device_get_match_data(const struct device *dev)
 907 {
 908         const struct acpi_device_id *match;
 909
 910         if (!dev->driver->acpi_match_table)
 911                 return acpi_of_device_get_match_data(dev);
 912
 913         match = acpi_match_device(dev->driver->acpi_match_table, dev);
 914         if (!match)
 915                 return NULL;
 916
 917         return (const void *)match->driver_data;
 918 }
 919 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 920
 921 int acpi_match_device_ids(struct acpi_device *device,
 922                           const struct acpi_device_id *ids)
 923 {
 924         return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
 925 }
 926 EXPORT_SYMBOL(acpi_match_device_ids);
 927
 928 bool acpi_driver_match_device(struct device *dev,
 929                               const struct device_driver *drv)
 930 {
 931         if (!drv->acpi_match_table)
 932                 return acpi_of_match_device(ACPI_COMPANION(dev),
 933                                             drv->of_match_table,
 934                                             NULL);
 935
 936         return __acpi_match_device(acpi_companion_match(dev),
 937                                    drv->acpi_match_table, drv->of_match_table,
 938                                    NULL, NULL);
 939 }
 940 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 941
 942 /* --------------------------------------------------------------------------
 943                               ACPI Driver Management
 944    -------------------------------------------------------------------------- */
 945
 946 /**
 947  * acpi_bus_register_driver - register a driver with the ACPI bus
 948  * @driver: driver being registered
 949  *
 950  * Registers a driver with the ACPI bus.  Searches the namespace for all
 951  * devices that match the driver's criteria and binds.  Returns zero for
 952  * success or a negative error status for failure.
 953  */
 954 int acpi_bus_register_driver(struct acpi_driver *driver)
 955 {
 956         int ret;
 957
 958         if (acpi_disabled)
 959                 return -ENODEV;
 960         driver->drv.name = driver->name;
 961         driver->drv.bus = &acpi_bus_type;
 962         driver->drv.owner = driver->owner;
 963
 964         ret = driver_register(&driver->drv);
 965         return ret;
 966 }
 967
 968 EXPORT_SYMBOL(acpi_bus_register_driver);
 969
 970 /**
 971  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 972  * @driver: driver to unregister
 973  *
 974  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 975  * devices that match the driver's criteria and unbinds.
 976  */
 977 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 978 {
 979         driver_unregister(&driver->drv);
 980 }
 981
 982 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 983
 984 /* --------------------------------------------------------------------------
 985                               ACPI Bus operations
 986    -------------------------------------------------------------------------- */
 987
 988 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 989 {
 990         struct acpi_device *acpi_dev = to_acpi_device(dev);
 991         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 992
 993         return acpi_dev->flags.match_driver
 994                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 995 }
 996
 997 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 998 {
 999         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1000 }
1001
1002 static int acpi_device_probe(struct device *dev)
1003 {
1004         struct acpi_device *acpi_dev = to_acpi_device(dev);
1005         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1006         int ret;
1007
1008         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1009                 return -EINVAL;
1010
1011         if (!acpi_drv->ops.add)
1012                 return -ENOSYS;
1013
1014         ret = acpi_drv->ops.add(acpi_dev);
1015         if (ret)
1016                 return ret;
1017
1018         acpi_dev->driver = acpi_drv;
1019
1020         pr_debug("Driver [%s] successfully bound to device [%s]\n",
1021                  acpi_drv->name, acpi_dev->pnp.bus_id);
1022
1023         if (acpi_drv->ops.notify) {
1024                 ret = acpi_device_install_notify_handler(acpi_dev);
1025                 if (ret) {
1026                         if (acpi_drv->ops.remove)
1027                                 acpi_drv->ops.remove(acpi_dev);
1028
1029                         acpi_dev->driver = NULL;
1030                         acpi_dev->driver_data = NULL;
1031                         return ret;
1032                 }
1033         }
1034
1035         pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1036                  acpi_dev->pnp.bus_id);
1037
1038         get_device(dev);
1039         return 0;
1040 }
1041
1042 static void acpi_device_remove(struct device *dev)
1043 {
1044         struct acpi_device *acpi_dev = to_acpi_device(dev);
1045         struct acpi_driver *acpi_drv = acpi_dev->driver;
1046
1047         if (acpi_drv) {
1048                 if (acpi_drv->ops.notify)
1049                         acpi_device_remove_notify_handler(acpi_dev);
1050                 if (acpi_drv->ops.remove)
1051                         acpi_drv->ops.remove(acpi_dev);
1052         }
1053         acpi_dev->driver = NULL;
1054         acpi_dev->driver_data = NULL;
1055
1056         put_device(dev);
1057 }
1058
1059 struct bus_type acpi_bus_type = {
1060         .name           = "acpi",
1061         .match          = acpi_bus_match,
1062         .probe          = acpi_device_probe,
1063         .remove         = acpi_device_remove,
1064         .uevent         = acpi_device_uevent,
1065 };
1066
1067 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1068 {
1069         return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1070 }
1071 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1072
1073 /* --------------------------------------------------------------------------
1074                              Initialization/Cleanup
1075    -------------------------------------------------------------------------- */
1076
1077 static int __init acpi_bus_init_irq(void)
1078 {
1079         acpi_status status;
1080         char *message = NULL;
1081
1082
1083         /*
1084          * Let the system know what interrupt model we are using by
1085          * evaluating the \_PIC object, if exists.
1086          */
1087
1088         switch (acpi_irq_model) {
1089         case ACPI_IRQ_MODEL_PIC:
1090                 message = "PIC";
1091                 break;
1092         case ACPI_IRQ_MODEL_IOAPIC:
1093                 message = "IOAPIC";
1094                 break;
1095         case ACPI_IRQ_MODEL_IOSAPIC:
1096                 message = "IOSAPIC";
1097                 break;
1098         case ACPI_IRQ_MODEL_GIC:
1099                 message = "GIC";
1100                 break;
1101         case ACPI_IRQ_MODEL_PLATFORM:
1102                 message = "platform specific model";
1103                 break;
1104         default:
1105                 pr_info("Unknown interrupt routing model\n");
1106                 return -ENODEV;
1107         }
1108
1109         pr_info("Using %s for interrupt routing\n", message);
1110
1111         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1112         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1113                 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1114                 return -ENODEV;
1115         }
1116
1117         return 0;
1118 }
1119
1120 /**
1121  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1122  *
1123  * The ACPI tables are accessible after this, but the handling of events has not
1124  * been initialized and the global lock is not available yet, so AML should not
1125  * be executed at this point.
1126  *
1127  * Doing this before switching the EFI runtime services to virtual mode allows
1128  * the EfiBootServices memory to be freed slightly earlier on boot.
1129  */
1130 void __init acpi_early_init(void)
1131 {
1132         acpi_status status;
1133
1134         if (acpi_disabled)
1135                 return;
1136
1137         pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1138
1139         /* enable workarounds, unless strict ACPI spec. compliance */
1140         if (!acpi_strict)
1141                 acpi_gbl_enable_interpreter_slack = TRUE;
1142
1143         acpi_permanent_mmap = true;
1144
1145 #ifdef CONFIG_X86
1146         /*
1147          * If the machine falls into the DMI check table,
1148          * DSDT will be copied to memory.
1149          * Note that calling dmi_check_system() here on other architectures
1150          * would not be OK because only x86 initializes dmi early enough.
1151          * Thankfully only x86 systems need such quirks for now.
1152          */
1153         dmi_check_system(dsdt_dmi_table);
1154 #endif
1155
1156         status = acpi_reallocate_root_table();
1157         if (ACPI_FAILURE(status)) {
1158                 pr_err("Unable to reallocate ACPI tables\n");
1159                 goto error0;
1160         }
1161
1162         status = acpi_initialize_subsystem();
1163         if (ACPI_FAILURE(status)) {
1164                 pr_err("Unable to initialize the ACPI Interpreter\n");
1165                 goto error0;
1166         }
1167
1168 #ifdef CONFIG_X86
1169         if (!acpi_ioapic) {
1170                 /* compatible (0) means level (3) */
1171                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1172                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1173                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1174                 }
1175                 /* Set PIC-mode SCI trigger type */
1176                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1177                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1178         } else {
1179                 /*
1180                  * now that acpi_gbl_FADT is initialized,
1181                  * update it with result from INT_SRC_OVR parsing
1182                  */
1183                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1184         }
1185 #endif
1186         return;
1187
1188  error0:
1189         disable_acpi();
1190 }
1191
1192 /**
1193  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1194  *
1195  * Switch over the platform to the ACPI mode (if possible).
1196  *
1197  * Doing this too early is generally unsafe, but at the same time it needs to be
1198  * done before all things that really depend on ACPI.  The right spot appears to
1199  * be before finalizing the EFI initialization.
1200  */
1201 void __init acpi_subsystem_init(void)
1202 {
1203         acpi_status status;
1204
1205         if (acpi_disabled)
1206                 return;
1207
1208         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1209         if (ACPI_FAILURE(status)) {
1210                 pr_err("Unable to enable ACPI\n");
1211                 disable_acpi();
1212         } else {
1213                 /*
1214                  * If the system is using ACPI then we can be reasonably
1215                  * confident that any regulators are managed by the firmware
1216                  * so tell the regulator core it has everything it needs to
1217                  * know.
1218                  */
1219                 regulator_has_full_constraints();
1220         }
1221 }
1222
1223 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1224 {
1225         if (event == ACPI_TABLE_EVENT_LOAD)
1226                 acpi_scan_table_notify();
1227
1228         return acpi_sysfs_table_handler(event, table, context);
1229 }
1230
1231 static int __init acpi_bus_init(void)
1232 {
1233         int result;
1234         acpi_status status;
1235
1236         acpi_os_initialize1();
1237
1238         status = acpi_load_tables();
1239         if (ACPI_FAILURE(status)) {
1240                 pr_err("Unable to load the System Description Tables\n");
1241                 goto error1;
1242         }
1243
1244         /*
1245          * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1246          * device is found in the namespace.
1247          *
1248          * This is accomplished by looking for the ECDT table and getting the EC
1249          * parameters out of that.
1250          *
1251          * Do that before calling acpi_initialize_objects() which may trigger EC
1252          * address space accesses.
1253          */
1254         acpi_ec_ecdt_probe();
1255
1256         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1257         if (ACPI_FAILURE(status)) {
1258                 pr_err("Unable to start the ACPI Interpreter\n");
1259                 goto error1;
1260         }
1261
1262         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1263         if (ACPI_FAILURE(status)) {
1264                 pr_err("Unable to initialize ACPI objects\n");
1265                 goto error1;
1266         }
1267
1268         /* Set capability bits for _OSC under processor scope */
1269         acpi_early_processor_osc();
1270
1271         /*
1272          * _OSC method may exist in module level code,
1273          * so it must be run after ACPI_FULL_INITIALIZATION
1274          */
1275         acpi_bus_osc_negotiate_platform_control();
1276         acpi_bus_osc_negotiate_usb_control();
1277
1278         /*
1279          * _PDC control method may load dynamic SSDT tables,
1280          * and we need to install the table handler before that.
1281          */
1282         status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1283
1284         acpi_sysfs_init();
1285
1286         acpi_early_processor_set_pdc();
1287
1288         /*
1289          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1290          * is necessary to enable it as early as possible.
1291          */
1292         acpi_ec_dsdt_probe();
1293
1294         pr_info("Interpreter enabled\n");
1295
1296         /* Initialize sleep structures */
1297         acpi_sleep_init();
1298
1299         /*
1300          * Get the system interrupt model and evaluate \_PIC.
1301          */
1302         result = acpi_bus_init_irq();
1303         if (result)
1304                 goto error1;
1305
1306         /*
1307          * Register the for all standard device notifications.
1308          */
1309         status =
1310             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1311                                         &acpi_bus_notify, NULL);
1312         if (ACPI_FAILURE(status)) {
1313                 pr_err("Unable to register for system notifications\n");
1314                 goto error1;
1315         }
1316
1317         /*
1318          * Create the top ACPI proc directory
1319          */
1320         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1321
1322         result = bus_register(&acpi_bus_type);
1323         if (!result)
1324                 return 0;
1325
1326         /* Mimic structured exception handling */
1327       error1:
1328         acpi_terminate();
1329         return -ENODEV;
1330 }
1331
1332 struct kobject *acpi_kobj;
1333 EXPORT_SYMBOL_GPL(acpi_kobj);
1334
1335 static int __init acpi_init(void)
1336 {
1337         int result;
1338
1339         if (acpi_disabled) {
1340                 pr_info("Interpreter disabled.\n");
1341                 return -ENODEV;
1342         }
1343
1344         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1345         if (!acpi_kobj)
1346                 pr_debug("%s: kset create error\n", __func__);
1347
1348         init_prmt();
1349         acpi_init_pcc();
1350         result = acpi_bus_init();
1351         if (result) {
1352                 kobject_put(acpi_kobj);
1353                 disable_acpi();
1354                 return result;
1355         }
1356
1357         pci_mmcfg_late_init();
1358         acpi_iort_init();
1359         acpi_hest_init();
1360         acpi_ghes_init();
1361         acpi_scan_init();
1362         acpi_ec_init();
1363         acpi_debugfs_init();
1364         acpi_sleep_proc_init();
1365         acpi_wakeup_device_init();
1366         acpi_debugger_init();
1367         acpi_setup_sb_notify_handler();
1368         acpi_viot_init();
1369         acpi_agdi_init();
1370         return 0;
1371 }
1372
1373 subsys_initcall(acpi_init);