drivers/acpi/bus.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   4  *
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  */
   7
   8 #define pr_fmt(fmt) "ACPI: " fmt
   9
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/ioport.h>
  13 #include <linux/kernel.h>
  14 #include <linux/list.h>
  15 #include <linux/sched.h>
  16 #include <linux/pm.h>
  17 #include <linux/device.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/acpi.h>
  20 #include <linux/slab.h>
  21 #include <linux/regulator/machine.h>
  22 #include <linux/workqueue.h>
  23 #include <linux/reboot.h>
  24 #include <linux/delay.h>
  25 #ifdef CONFIG_X86
  26 #include <asm/mpspec.h>
  27 #include <linux/dmi.h>
  28 #endif
  29 #include <linux/acpi_viot.h>
  30 #include <linux/pci.h>
  31 #include <acpi/apei.h>
  32 #include <linux/suspend.h>
  33 #include <linux/prmt.h>
  34
  35 #include "internal.h"
  36
  37 struct acpi_device *acpi_root;
  38 struct proc_dir_entry *acpi_root_dir;
  39 EXPORT_SYMBOL(acpi_root_dir);
  40
  41 #ifdef CONFIG_X86
  42 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  43 static inline int set_copy_dsdt(const struct dmi_system_id *id)
  44 {
  45         return 0;
  46 }
  47 #else
  48 static int set_copy_dsdt(const struct dmi_system_id *id)
  49 {
  50         pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
  51         acpi_gbl_copy_dsdt_locally = 1;
  52         return 0;
  53 }
  54 #endif
  55
  56 static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
  57         /*
  58          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  59          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  60          */
  61         {
  62          .callback = set_copy_dsdt,
  63          .ident = "TOSHIBA Satellite",
  64          .matches = {
  65                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  66                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  67                 },
  68         },
  69         {}
  70 };
  71 #endif
  72
  73 /* --------------------------------------------------------------------------
  74                                 Device Management
  75    -------------------------------------------------------------------------- */
  76
  77 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  78                                        unsigned long long *sta)
  79 {
  80         acpi_status status;
  81
  82         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  83         if (ACPI_SUCCESS(status))
  84                 return AE_OK;
  85
  86         if (status == AE_NOT_FOUND) {
  87                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
  88                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
  89                 return AE_OK;
  90         }
  91         return status;
  92 }
  93 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
  94
  95 int acpi_bus_get_status(struct acpi_device *device)
  96 {
  97         acpi_status status;
  98         unsigned long long sta;
  99
 100         if (acpi_device_override_status(device, &sta)) {
 101                 acpi_set_device_status(device, sta);
 102                 return 0;
 103         }
 104
 105         /* Battery devices must have their deps met before calling _STA */
 106         if (acpi_device_is_battery(device) && device->dep_unmet) {
 107                 acpi_set_device_status(device, 0);
 108                 return 0;
 109         }
 110
 111         status = acpi_bus_get_status_handle(device->handle, &sta);
 112         if (ACPI_FAILURE(status))
 113                 return -ENODEV;
 114
 115         if (!device->status.present && device->status.enabled) {
 116                 pr_info(FW_BUG "Device [%s] status [%08x]: not present and enabled\n",
 117                         device->pnp.bus_id, (u32)sta);
 118                 device->status.enabled = 0;
 119                 /*
 120                  * The status is clearly invalid, so clear the functional bit as
 121                  * well to avoid attempting to use the device.
 122                  */
 123                 device->status.functional = 0;
 124         }
 125
 126         acpi_set_device_status(device, sta);
 127
 128         if (device->status.functional && !device->status.present) {
 129                 pr_debug("Device [%s] status [%08x]: functional but not present\n",
 130                          device->pnp.bus_id, (u32)sta);
 131         }
 132
 133         pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
 134         return 0;
 135 }
 136 EXPORT_SYMBOL(acpi_bus_get_status);
 137
 138 void acpi_bus_private_data_handler(acpi_handle handle,
 139                                    void *context)
 140 {
 141         return;
 142 }
 143 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 144
 145 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
 146 {
 147         acpi_status status;
 148
 149         status = acpi_attach_data(handle,
 150                         acpi_bus_private_data_handler, data);
 151         if (ACPI_FAILURE(status)) {
 152                 acpi_handle_debug(handle, "Error attaching device data\n");
 153                 return -ENODEV;
 154         }
 155
 156         return 0;
 157 }
 158 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
 159
 160 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 161 {
 162         acpi_status status;
 163
 164         if (!data)
 165                 return -EINVAL;
 166
 167         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 168         if (ACPI_FAILURE(status)) {
 169                 acpi_handle_debug(handle, "No context for object\n");
 170                 return -ENODEV;
 171         }
 172
 173         return 0;
 174 }
 175 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
 176
 177 void acpi_bus_detach_private_data(acpi_handle handle)
 178 {
 179         acpi_detach_data(handle, acpi_bus_private_data_handler);
 180 }
 181 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
 182
 183 static void acpi_print_osc_error(acpi_handle handle,
 184                                  struct acpi_osc_context *context, char *error)
 185 {
 186         int i;
 187
 188         acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
 189
 190         pr_debug("_OSC request data:");
 191         for (i = 0; i < context->cap.length; i += sizeof(u32))
 192                 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
 193
 194         pr_debug("\n");
 195 }
 196
 197 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 198 {
 199         acpi_status status;
 200         struct acpi_object_list input;
 201         union acpi_object in_params[4];
 202         union acpi_object *out_obj;
 203         guid_t guid;
 204         u32 errors;
 205         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 206
 207         if (!context)
 208                 return AE_ERROR;
 209         if (guid_parse(context->uuid_str, &guid))
 210                 return AE_ERROR;
 211         context->ret.length = ACPI_ALLOCATE_BUFFER;
 212         context->ret.pointer = NULL;
 213
 214         /* Setting up input parameters */
 215         input.count = 4;
 216         input.pointer = in_params;
 217         in_params[0].type               = ACPI_TYPE_BUFFER;
 218         in_params[0].buffer.length      = 16;
 219         in_params[0].buffer.pointer     = (u8 *)&guid;
 220         in_params[1].type               = ACPI_TYPE_INTEGER;
 221         in_params[1].integer.value      = context->rev;
 222         in_params[2].type               = ACPI_TYPE_INTEGER;
 223         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 224         in_params[3].type               = ACPI_TYPE_BUFFER;
 225         in_params[3].buffer.length      = context->cap.length;
 226         in_params[3].buffer.pointer     = context->cap.pointer;
 227
 228         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 229         if (ACPI_FAILURE(status))
 230                 return status;
 231
 232         if (!output.length)
 233                 return AE_NULL_OBJECT;
 234
 235         out_obj = output.pointer;
 236         if (out_obj->type != ACPI_TYPE_BUFFER
 237                 || out_obj->buffer.length != context->cap.length) {
 238                 acpi_print_osc_error(handle, context,
 239                         "_OSC evaluation returned wrong type");
 240                 status = AE_TYPE;
 241                 goto out_kfree;
 242         }
 243         /* Need to ignore the bit0 in result code */
 244         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 245         if (errors) {
 246                 if (errors & OSC_REQUEST_ERROR)
 247                         acpi_print_osc_error(handle, context,
 248                                 "_OSC request failed");
 249                 if (errors & OSC_INVALID_UUID_ERROR)
 250                         acpi_print_osc_error(handle, context,
 251                                 "_OSC invalid UUID");
 252                 if (errors & OSC_INVALID_REVISION_ERROR)
 253                         acpi_print_osc_error(handle, context,
 254                                 "_OSC invalid revision");
 255                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 256                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 257                             & OSC_QUERY_ENABLE)
 258                                 goto out_success;
 259                         status = AE_SUPPORT;
 260                         goto out_kfree;
 261                 }
 262                 status = AE_ERROR;
 263                 goto out_kfree;
 264         }
 265 out_success:
 266         context->ret.length = out_obj->buffer.length;
 267         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 268                                        context->ret.length, GFP_KERNEL);
 269         if (!context->ret.pointer) {
 270                 status =  AE_NO_MEMORY;
 271                 goto out_kfree;
 272         }
 273         status =  AE_OK;
 274
 275 out_kfree:
 276         kfree(output.pointer);
 277         return status;
 278 }
 279 EXPORT_SYMBOL(acpi_run_osc);
 280
 281 bool osc_sb_apei_support_acked;
 282
 283 /*
 284  * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
 285  * OSPM supports platform coordinated low power idle(LPI) states
 286  */
 287 bool osc_pc_lpi_support_confirmed;
 288 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
 289
 290 /*
 291  * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
 292  *   Starting with ACPI Specification 6.2, all _CPC registers can be in
 293  *   PCC, System Memory, System IO, or Functional Fixed Hardware address
 294  *   spaces. OSPM support for this more flexible register space scheme is
 295  *   indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.
 296  *
 297  * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
 298  * - PCC or Functional Fixed Hardware address space if defined
 299  * - SystemMemory address space (NULL register) if not defined
 300  */
 301 bool osc_cpc_flexible_adr_space_confirmed;
 302 EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
 303
 304 /*
 305  * ACPI 6.4 Operating System Capabilities for USB.
 306  */
 307 bool osc_sb_native_usb4_support_confirmed;
 308 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
 309
 310 bool osc_sb_cppc2_support_acked;
 311
 312 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 313 static void acpi_bus_osc_negotiate_platform_control(void)
 314 {
 315         u32 capbuf[2], *capbuf_ret;
 316         struct acpi_osc_context context = {
 317                 .uuid_str = sb_uuid_str,
 318                 .rev = 1,
 319                 .cap.length = 8,
 320                 .cap.pointer = capbuf,
 321         };
 322         acpi_handle handle;
 323
 324         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 325         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 326         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
 327                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 328         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 329                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 330
 331         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 332         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
 333         if (IS_ENABLED(CONFIG_ACPI_PRMT))
 334                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
 335         if (IS_ENABLED(CONFIG_ACPI_FFH))
 336                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT;
 337
 338 #ifdef CONFIG_ARM64
 339         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 340 #endif
 341 #ifdef CONFIG_X86
 342         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 343 #endif
 344
 345 #ifdef CONFIG_ACPI_CPPC_LIB
 346         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
 347         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
 348 #endif
 349
 350         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
 351
 352         if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
 353                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
 354
 355         if (IS_ENABLED(CONFIG_USB4))
 356                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
 357
 358         if (!ghes_disable)
 359                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 360         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 361                 return;
 362
 363         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 364                 return;
 365
 366         capbuf_ret = context.ret.pointer;
 367         if (context.ret.length <= OSC_SUPPORT_DWORD) {
 368                 kfree(context.ret.pointer);
 369                 return;
 370         }
 371
 372         /*
 373          * Now run _OSC again with query flag clear and with the caps
 374          * supported by both the OS and the platform.
 375          */
 376         capbuf[OSC_QUERY_DWORD] = 0;
 377         capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
 378         kfree(context.ret.pointer);
 379
 380         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 381                 return;
 382
 383         capbuf_ret = context.ret.pointer;
 384         if (context.ret.length > OSC_SUPPORT_DWORD) {
 385 #ifdef CONFIG_ACPI_CPPC_LIB
 386                 osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;
 387 #endif
 388
 389                 osc_sb_apei_support_acked =
 390                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 391                 osc_pc_lpi_support_confirmed =
 392                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
 393                 osc_sb_native_usb4_support_confirmed =
 394                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
 395                 osc_cpc_flexible_adr_space_confirmed =
 396                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
 397         }
 398
 399         kfree(context.ret.pointer);
 400 }
 401
 402 /*
 403  * Native control of USB4 capabilities. If any of the tunneling bits is
 404  * set it means OS is in control and we use software based connection
 405  * manager.
 406  */
 407 u32 osc_sb_native_usb4_control;
 408 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
 409
 410 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
 411 {
 412         pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
 413                (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
 414                (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
 415                (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
 416                (bits & OSC_USB_XDOMAIN) ? '+' : '-');
 417 }
 418
 419 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
 420 static void acpi_bus_osc_negotiate_usb_control(void)
 421 {
 422         u32 capbuf[3], *capbuf_ret;
 423         struct acpi_osc_context context = {
 424                 .uuid_str = sb_usb_uuid_str,
 425                 .rev = 1,
 426                 .cap.length = sizeof(capbuf),
 427                 .cap.pointer = capbuf,
 428         };
 429         acpi_handle handle;
 430         acpi_status status;
 431         u32 control;
 432
 433         if (!osc_sb_native_usb4_support_confirmed)
 434                 return;
 435
 436         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 437                 return;
 438
 439         control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
 440                   OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
 441
 442         /*
 443          * Run _OSC first with query bit set, trying to get control over
 444          * all tunneling. The platform can then clear out bits in the
 445          * control dword that it does not want to grant to the OS.
 446          */
 447         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 448         capbuf[OSC_SUPPORT_DWORD] = 0;
 449         capbuf[OSC_CONTROL_DWORD] = control;
 450
 451         status = acpi_run_osc(handle, &context);
 452         if (ACPI_FAILURE(status))
 453                 return;
 454
 455         if (context.ret.length != sizeof(capbuf)) {
 456                 pr_info("USB4 _OSC: returned invalid length buffer\n");
 457                 goto out_free;
 458         }
 459
 460         /*
 461          * Run _OSC again now with query bit clear and the control dword
 462          * matching what the platform granted (which may not have all
 463          * the control bits set).
 464          */
 465         capbuf_ret = context.ret.pointer;
 466
 467         capbuf[OSC_QUERY_DWORD] = 0;
 468         capbuf[OSC_CONTROL_DWORD] = capbuf_ret[OSC_CONTROL_DWORD];
 469
 470         kfree(context.ret.pointer);
 471
 472         status = acpi_run_osc(handle, &context);
 473         if (ACPI_FAILURE(status))
 474                 return;
 475
 476         if (context.ret.length != sizeof(capbuf)) {
 477                 pr_info("USB4 _OSC: returned invalid length buffer\n");
 478                 goto out_free;
 479         }
 480
 481         osc_sb_native_usb4_control =
 482                 control & acpi_osc_ctx_get_pci_control(&context);
 483
 484         acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
 485         acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
 486                                 osc_sb_native_usb4_control);
 487
 488 out_free:
 489         kfree(context.ret.pointer);
 490 }
 491
 492 /* --------------------------------------------------------------------------
 493                              Notification Handling
 494    -------------------------------------------------------------------------- */
 495
 496 /**
 497  * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler
 498  * @handle: Target ACPI object.
 499  * @type: Notification type.
 500  * @data: Ignored.
 501  *
 502  * This only handles notifications related to device hotplug.
 503  */
 504 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 505 {
 506         struct acpi_device *adev;
 507
 508         switch (type) {
 509         case ACPI_NOTIFY_BUS_CHECK:
 510                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 511                 break;
 512
 513         case ACPI_NOTIFY_DEVICE_CHECK:
 514                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 515                 break;
 516
 517         case ACPI_NOTIFY_DEVICE_WAKE:
 518                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 519                 return;
 520
 521         case ACPI_NOTIFY_EJECT_REQUEST:
 522                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 523                 break;
 524
 525         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 526                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 527                 /* TBD: Exactly what does 'light' mean? */
 528                 return;
 529
 530         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 531                 acpi_handle_err(handle, "Device cannot be configured due "
 532                                 "to a frequency mismatch\n");
 533                 return;
 534
 535         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 536                 acpi_handle_err(handle, "Device cannot be configured due "
 537                                 "to a bus mode mismatch\n");
 538                 return;
 539
 540         case ACPI_NOTIFY_POWER_FAULT:
 541                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 542                 return;
 543
 544         default:
 545                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 546                 return;
 547         }
 548
 549         adev = acpi_get_acpi_dev(handle);
 550
 551         if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 552                 return;
 553
 554         acpi_put_acpi_dev(adev);
 555
 556         acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 557 }
 558
 559 static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
 560 {
 561         struct acpi_device *device = data;
 562         struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
 563
 564         acpi_drv->ops.notify(device, event);
 565 }
 566
 567 static int acpi_device_install_notify_handler(struct acpi_device *device,
 568                                               struct acpi_driver *acpi_drv)
 569 {
 570         u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
 571                                 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
 572         acpi_status status;
 573
 574         status = acpi_install_notify_handler(device->handle, type,
 575                                              acpi_notify_device, device);
 576         if (ACPI_FAILURE(status))
 577                 return -EINVAL;
 578
 579         return 0;
 580 }
 581
 582 static void acpi_device_remove_notify_handler(struct acpi_device *device,
 583                                               struct acpi_driver *acpi_drv)
 584 {
 585         u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
 586                                 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
 587
 588         acpi_remove_notify_handler(device->handle, type,
 589                                    acpi_notify_device);
 590
 591         acpi_os_wait_events_complete();
 592 }
 593
 594 int acpi_dev_install_notify_handler(struct acpi_device *adev,
 595                                     u32 handler_type,
 596                                     acpi_notify_handler handler, void *context)
 597 {
 598         acpi_status status;
 599
 600         status = acpi_install_notify_handler(adev->handle, handler_type,
 601                                              handler, context);
 602         if (ACPI_FAILURE(status))
 603                 return -ENODEV;
 604
 605         return 0;
 606 }
 607 EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler);
 608
 609 void acpi_dev_remove_notify_handler(struct acpi_device *adev,
 610                                     u32 handler_type,
 611                                     acpi_notify_handler handler)
 612 {
 613         acpi_remove_notify_handler(adev->handle, handler_type, handler);
 614         acpi_os_wait_events_complete();
 615 }
 616 EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler);
 617
 618 /* Handle events targeting \_SB device (at present only graceful shutdown) */
 619
 620 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 621 #define ACPI_SB_INDICATE_INTERVAL       10000
 622
 623 static void sb_notify_work(struct work_struct *dummy)
 624 {
 625         acpi_handle sb_handle;
 626
 627         orderly_poweroff(true);
 628
 629         /*
 630          * After initiating graceful shutdown, the ACPI spec requires OSPM
 631          * to evaluate _OST method once every 10seconds to indicate that
 632          * the shutdown is in progress
 633          */
 634         acpi_get_handle(NULL, "\\_SB", &sb_handle);
 635         while (1) {
 636                 pr_info("Graceful shutdown in progress.\n");
 637                 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 638                                 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 639                 msleep(ACPI_SB_INDICATE_INTERVAL);
 640         }
 641 }
 642
 643 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 644 {
 645         static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 646
 647         if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 648                 if (!work_busy(&acpi_sb_work))
 649                         schedule_work(&acpi_sb_work);
 650         } else {
 651                 pr_warn("event %x is not supported by \\_SB device\n", event);
 652         }
 653 }
 654
 655 static int __init acpi_setup_sb_notify_handler(void)
 656 {
 657         acpi_handle sb_handle;
 658
 659         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 660                 return -ENXIO;
 661
 662         if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 663                                                 acpi_sb_notify, NULL)))
 664                 return -EINVAL;
 665
 666         return 0;
 667 }
 668
 669 /* --------------------------------------------------------------------------
 670                              Device Matching
 671    -------------------------------------------------------------------------- */
 672
 673 /**
 674  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 675  * @adev:       ACPI device in question
 676  *
 677  * Return: First physical node of ACPI device @adev
 678  */
 679 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 680 {
 681         struct mutex *physical_node_lock = &adev->physical_node_lock;
 682         struct device *phys_dev;
 683
 684         mutex_lock(physical_node_lock);
 685         if (list_empty(&adev->physical_node_list)) {
 686                 phys_dev = NULL;
 687         } else {
 688                 const struct acpi_device_physical_node *node;
 689
 690                 node = list_first_entry(&adev->physical_node_list,
 691                                         struct acpi_device_physical_node, node);
 692
 693                 phys_dev = node->dev;
 694         }
 695         mutex_unlock(physical_node_lock);
 696         return phys_dev;
 697 }
 698 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
 699
 700 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 701                                                       const struct device *dev)
 702 {
 703         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 704
 705         return phys_dev && phys_dev == dev ? adev : NULL;
 706 }
 707
 708 /**
 709  * acpi_device_is_first_physical_node - Is given dev first physical node
 710  * @adev: ACPI companion device
 711  * @dev: Physical device to check
 712  *
 713  * Function checks if given @dev is the first physical devices attached to
 714  * the ACPI companion device. This distinction is needed in some cases
 715  * where the same companion device is shared between many physical devices.
 716  *
 717  * Note that the caller have to provide valid @adev pointer.
 718  */
 719 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 720                                         const struct device *dev)
 721 {
 722         return !!acpi_primary_dev_companion(adev, dev);
 723 }
 724
 725 /*
 726  * acpi_companion_match() - Can we match via ACPI companion device
 727  * @dev: Device in question
 728  *
 729  * Check if the given device has an ACPI companion and if that companion has
 730  * a valid list of PNP IDs, and if the device is the first (primary) physical
 731  * device associated with it.  Return the companion pointer if that's the case
 732  * or NULL otherwise.
 733  *
 734  * If multiple physical devices are attached to a single ACPI companion, we need
 735  * to be careful.  The usage scenario for this kind of relationship is that all
 736  * of the physical devices in question use resources provided by the ACPI
 737  * companion.  A typical case is an MFD device where all the sub-devices share
 738  * the parent's ACPI companion.  In such cases we can only allow the primary
 739  * (first) physical device to be matched with the help of the companion's PNP
 740  * IDs.
 741  *
 742  * Additional physical devices sharing the ACPI companion can still use
 743  * resources available from it but they will be matched normally using functions
 744  * provided by their bus types (and analogously for their modalias).
 745  */
 746 const struct acpi_device *acpi_companion_match(const struct device *dev)
 747 {
 748         struct acpi_device *adev;
 749
 750         adev = ACPI_COMPANION(dev);
 751         if (!adev)
 752                 return NULL;
 753
 754         if (list_empty(&adev->pnp.ids))
 755                 return NULL;
 756
 757         return acpi_primary_dev_companion(adev, dev);
 758 }
 759
 760 /**
 761  * acpi_of_match_device - Match device object using the "compatible" property.
 762  * @adev: ACPI device object to match.
 763  * @of_match_table: List of device IDs to match against.
 764  * @of_id: OF ID if matched
 765  *
 766  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 767  * identifiers and a _DSD object with the "compatible" property, use that
 768  * property to match against the given list of identifiers.
 769  */
 770 static bool acpi_of_match_device(const struct acpi_device *adev,
 771                                  const struct of_device_id *of_match_table,
 772                                  const struct of_device_id **of_id)
 773 {
 774         const union acpi_object *of_compatible, *obj;
 775         int i, nval;
 776
 777         if (!adev)
 778                 return false;
 779
 780         of_compatible = adev->data.of_compatible;
 781         if (!of_match_table || !of_compatible)
 782                 return false;
 783
 784         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 785                 nval = of_compatible->package.count;
 786                 obj = of_compatible->package.elements;
 787         } else { /* Must be ACPI_TYPE_STRING. */
 788                 nval = 1;
 789                 obj = of_compatible;
 790         }
 791         /* Now we can look for the driver DT compatible strings */
 792         for (i = 0; i < nval; i++, obj++) {
 793                 const struct of_device_id *id;
 794
 795                 for (id = of_match_table; id->compatible[0]; id++)
 796                         if (!strcasecmp(obj->string.pointer, id->compatible)) {
 797                                 if (of_id)
 798                                         *of_id = id;
 799                                 return true;
 800                         }
 801         }
 802
 803         return false;
 804 }
 805
 806 static bool acpi_of_modalias(struct acpi_device *adev,
 807                              char *modalias, size_t len)
 808 {
 809         const union acpi_object *of_compatible;
 810         const union acpi_object *obj;
 811         const char *str, *chr;
 812
 813         of_compatible = adev->data.of_compatible;
 814         if (!of_compatible)
 815                 return false;
 816
 817         if (of_compatible->type == ACPI_TYPE_PACKAGE)
 818                 obj = of_compatible->package.elements;
 819         else /* Must be ACPI_TYPE_STRING. */
 820                 obj = of_compatible;
 821
 822         str = obj->string.pointer;
 823         chr = strchr(str, ',');
 824         strscpy(modalias, chr ? chr + 1 : str, len);
 825
 826         return true;
 827 }
 828
 829 /**
 830  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 831  * @adev:       ACPI device object to match
 832  * @default_id: ID string to use as default if no compatible string found
 833  * @modalias:   Pointer to buffer that modalias value will be copied into
 834  * @len:        Length of modalias buffer
 835  *
 836  * This is a counterpart of of_alias_from_compatible() for struct acpi_device
 837  * objects. If there is a compatible string for @adev, it will be copied to
 838  * @modalias with the vendor prefix stripped; otherwise, @default_id will be
 839  * used.
 840  */
 841 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 842                        char *modalias, size_t len)
 843 {
 844         if (!acpi_of_modalias(adev, modalias, len))
 845                 strscpy(modalias, default_id, len);
 846 }
 847 EXPORT_SYMBOL_GPL(acpi_set_modalias);
 848
 849 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 850                                     struct acpi_hardware_id *hwid)
 851 {
 852         int i, msk, byte_shift;
 853         char buf[3];
 854
 855         if (!id->cls)
 856                 return false;
 857
 858         /* Apply class-code bitmask, before checking each class-code byte */
 859         for (i = 1; i <= 3; i++) {
 860                 byte_shift = 8 * (3 - i);
 861                 msk = (id->cls_msk >> byte_shift) & 0xFF;
 862                 if (!msk)
 863                         continue;
 864
 865                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 866                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 867                         return false;
 868         }
 869         return true;
 870 }
 871
 872 static bool __acpi_match_device(const struct acpi_device *device,
 873                                 const struct acpi_device_id *acpi_ids,
 874                                 const struct of_device_id *of_ids,
 875                                 const struct acpi_device_id **acpi_id,
 876                                 const struct of_device_id **of_id)
 877 {
 878         const struct acpi_device_id *id;
 879         struct acpi_hardware_id *hwid;
 880
 881         /*
 882          * If the device is not present, it is unnecessary to load device
 883          * driver for it.
 884          */
 885         if (!device || !device->status.present)
 886                 return false;
 887
 888         list_for_each_entry(hwid, &device->pnp.ids, list) {
 889                 /* First, check the ACPI/PNP IDs provided by the caller. */
 890                 if (acpi_ids) {
 891                         for (id = acpi_ids; id->id[0] || id->cls; id++) {
 892                                 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
 893                                         goto out_acpi_match;
 894                                 if (id->cls && __acpi_match_device_cls(id, hwid))
 895                                         goto out_acpi_match;
 896                         }
 897                 }
 898
 899                 /*
 900                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 901                  * "compatible" property if found.
 902                  */
 903                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
 904                         return acpi_of_match_device(device, of_ids, of_id);
 905         }
 906         return false;
 907
 908 out_acpi_match:
 909         if (acpi_id)
 910                 *acpi_id = id;
 911         return true;
 912 }
 913
 914 /**
 915  * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs
 916  * @ids: Array of struct acpi_device_id objects to match against.
 917  * @adev: The ACPI device pointer to match.
 918  *
 919  * Match the ACPI device @adev against a given list of ACPI IDs @ids.
 920  *
 921  * Return:
 922  * a pointer to the first matching ACPI ID on success or %NULL on failure.
 923  */
 924 const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,
 925                                                     const struct acpi_device *adev)
 926 {
 927         const struct acpi_device_id *id = NULL;
 928
 929         __acpi_match_device(adev, ids, NULL, &id, NULL);
 930         return id;
 931 }
 932 EXPORT_SYMBOL_GPL(acpi_match_acpi_device);
 933
 934 /**
 935  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 936  * @ids: Array of struct acpi_device_id object to match against.
 937  * @dev: The device structure to match.
 938  *
 939  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 940  * object for that handle and use that object to match against a given list of
 941  * device IDs.
 942  *
 943  * Return a pointer to the first matching ID on success or %NULL on failure.
 944  */
 945 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 946                                                const struct device *dev)
 947 {
 948         return acpi_match_acpi_device(ids, acpi_companion_match(dev));
 949 }
 950 EXPORT_SYMBOL_GPL(acpi_match_device);
 951
 952 static const void *acpi_of_device_get_match_data(const struct device *dev)
 953 {
 954         struct acpi_device *adev = ACPI_COMPANION(dev);
 955         const struct of_device_id *match = NULL;
 956
 957         if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
 958                 return NULL;
 959
 960         return match->data;
 961 }
 962
 963 const void *acpi_device_get_match_data(const struct device *dev)
 964 {
 965         const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
 966         const struct acpi_device_id *match;
 967
 968         if (!acpi_ids)
 969                 return acpi_of_device_get_match_data(dev);
 970
 971         match = acpi_match_device(acpi_ids, dev);
 972         if (!match)
 973                 return NULL;
 974
 975         return (const void *)match->driver_data;
 976 }
 977 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 978
 979 int acpi_match_device_ids(struct acpi_device *device,
 980                           const struct acpi_device_id *ids)
 981 {
 982         return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
 983 }
 984 EXPORT_SYMBOL(acpi_match_device_ids);
 985
 986 bool acpi_driver_match_device(struct device *dev,
 987                               const struct device_driver *drv)
 988 {
 989         const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
 990         const struct of_device_id *of_ids = drv->of_match_table;
 991
 992         if (!acpi_ids)
 993                 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);
 994
 995         return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
 996 }
 997 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 998
 999 /* --------------------------------------------------------------------------
1000                               ACPI Driver Management
1001    -------------------------------------------------------------------------- */
1002
1003 /**
1004  * acpi_bus_register_driver - register a driver with the ACPI bus
1005  * @driver: driver being registered
1006  *
1007  * Registers a driver with the ACPI bus.  Searches the namespace for all
1008  * devices that match the driver's criteria and binds.  Returns zero for
1009  * success or a negative error status for failure.
1010  */
1011 int acpi_bus_register_driver(struct acpi_driver *driver)
1012 {
1013         if (acpi_disabled)
1014                 return -ENODEV;
1015         driver->drv.name = driver->name;
1016         driver->drv.bus = &acpi_bus_type;
1017         driver->drv.owner = driver->owner;
1018
1019         return driver_register(&driver->drv);
1020 }
1021
1022 EXPORT_SYMBOL(acpi_bus_register_driver);
1023
1024 /**
1025  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1026  * @driver: driver to unregister
1027  *
1028  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1029  * devices that match the driver's criteria and unbinds.
1030  */
1031 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1032 {
1033         driver_unregister(&driver->drv);
1034 }
1035
1036 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1037
1038 /* --------------------------------------------------------------------------
1039                               ACPI Bus operations
1040    -------------------------------------------------------------------------- */
1041
1042 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1043 {
1044         struct acpi_device *acpi_dev = to_acpi_device(dev);
1045         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1046
1047         return acpi_dev->flags.match_driver
1048                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1049 }
1050
1051 static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
1052 {
1053         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1054 }
1055
1056 static int acpi_device_probe(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         int ret;
1061
1062         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1063                 return -EINVAL;
1064
1065         if (!acpi_drv->ops.add)
1066                 return -ENOSYS;
1067
1068         ret = acpi_drv->ops.add(acpi_dev);
1069         if (ret) {
1070                 acpi_dev->driver_data = NULL;
1071                 return ret;
1072         }
1073
1074         pr_debug("Driver [%s] successfully bound to device [%s]\n",
1075                  acpi_drv->name, acpi_dev->pnp.bus_id);
1076
1077         if (acpi_drv->ops.notify) {
1078                 ret = acpi_device_install_notify_handler(acpi_dev, acpi_drv);
1079                 if (ret) {
1080                         if (acpi_drv->ops.remove)
1081                                 acpi_drv->ops.remove(acpi_dev);
1082
1083                         acpi_dev->driver_data = NULL;
1084                         return ret;
1085                 }
1086         }
1087
1088         pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1089                  acpi_dev->pnp.bus_id);
1090
1091         get_device(dev);
1092         return 0;
1093 }
1094
1095 static void acpi_device_remove(struct device *dev)
1096 {
1097         struct acpi_device *acpi_dev = to_acpi_device(dev);
1098         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1099
1100         if (acpi_drv->ops.notify)
1101                 acpi_device_remove_notify_handler(acpi_dev, acpi_drv);
1102
1103         if (acpi_drv->ops.remove)
1104                 acpi_drv->ops.remove(acpi_dev);
1105
1106         acpi_dev->driver_data = NULL;
1107
1108         put_device(dev);
1109 }
1110
1111 const struct bus_type acpi_bus_type = {
1112         .name           = "acpi",
1113         .match          = acpi_bus_match,
1114         .probe          = acpi_device_probe,
1115         .remove         = acpi_device_remove,
1116         .uevent         = acpi_device_uevent,
1117 };
1118
1119 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1120 {
1121         return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1122 }
1123 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1124
1125 struct acpi_dev_walk_context {
1126         int (*fn)(struct acpi_device *, void *);
1127         void *data;
1128 };
1129
1130 static int acpi_dev_for_one_check(struct device *dev, void *context)
1131 {
1132         struct acpi_dev_walk_context *adwc = context;
1133
1134         if (dev->bus != &acpi_bus_type)
1135                 return 0;
1136
1137         return adwc->fn(to_acpi_device(dev), adwc->data);
1138 }
1139 EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1140
1141 int acpi_dev_for_each_child(struct acpi_device *adev,
1142                             int (*fn)(struct acpi_device *, void *), void *data)
1143 {
1144         struct acpi_dev_walk_context adwc = {
1145                 .fn = fn,
1146                 .data = data,
1147         };
1148
1149         return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1150 }
1151
1152 int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1153                                     int (*fn)(struct acpi_device *, void *),
1154                                     void *data)
1155 {
1156         struct acpi_dev_walk_context adwc = {
1157                 .fn = fn,
1158                 .data = data,
1159         };
1160
1161         return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
1162 }
1163
1164 /* --------------------------------------------------------------------------
1165                              Initialization/Cleanup
1166    -------------------------------------------------------------------------- */
1167
1168 static int __init acpi_bus_init_irq(void)
1169 {
1170         acpi_status status;
1171         char *message = NULL;
1172
1173
1174         /*
1175          * Let the system know what interrupt model we are using by
1176          * evaluating the \_PIC object, if exists.
1177          */
1178
1179         switch (acpi_irq_model) {
1180         case ACPI_IRQ_MODEL_PIC:
1181                 message = "PIC";
1182                 break;
1183         case ACPI_IRQ_MODEL_IOAPIC:
1184                 message = "IOAPIC";
1185                 break;
1186         case ACPI_IRQ_MODEL_IOSAPIC:
1187                 message = "IOSAPIC";
1188                 break;
1189         case ACPI_IRQ_MODEL_GIC:
1190                 message = "GIC";
1191                 break;
1192         case ACPI_IRQ_MODEL_PLATFORM:
1193                 message = "platform specific model";
1194                 break;
1195         case ACPI_IRQ_MODEL_LPIC:
1196                 message = "LPIC";
1197                 break;
1198         default:
1199                 pr_info("Unknown interrupt routing model\n");
1200                 return -ENODEV;
1201         }
1202
1203         pr_info("Using %s for interrupt routing\n", message);
1204
1205         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1206         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1207                 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1208                 return -ENODEV;
1209         }
1210
1211         return 0;
1212 }
1213
1214 /**
1215  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1216  *
1217  * The ACPI tables are accessible after this, but the handling of events has not
1218  * been initialized and the global lock is not available yet, so AML should not
1219  * be executed at this point.
1220  *
1221  * Doing this before switching the EFI runtime services to virtual mode allows
1222  * the EfiBootServices memory to be freed slightly earlier on boot.
1223  */
1224 void __init acpi_early_init(void)
1225 {
1226         acpi_status status;
1227
1228         if (acpi_disabled)
1229                 return;
1230
1231         pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1232
1233         /* enable workarounds, unless strict ACPI spec. compliance */
1234         if (!acpi_strict)
1235                 acpi_gbl_enable_interpreter_slack = TRUE;
1236
1237         acpi_permanent_mmap = true;
1238
1239 #ifdef CONFIG_X86
1240         /*
1241          * If the machine falls into the DMI check table,
1242          * DSDT will be copied to memory.
1243          * Note that calling dmi_check_system() here on other architectures
1244          * would not be OK because only x86 initializes dmi early enough.
1245          * Thankfully only x86 systems need such quirks for now.
1246          */
1247         dmi_check_system(dsdt_dmi_table);
1248 #endif
1249
1250         status = acpi_reallocate_root_table();
1251         if (ACPI_FAILURE(status)) {
1252                 pr_err("Unable to reallocate ACPI tables\n");
1253                 goto error0;
1254         }
1255
1256         status = acpi_initialize_subsystem();
1257         if (ACPI_FAILURE(status)) {
1258                 pr_err("Unable to initialize the ACPI Interpreter\n");
1259                 goto error0;
1260         }
1261
1262 #ifdef CONFIG_X86
1263         if (!acpi_ioapic) {
1264                 /* compatible (0) means level (3) */
1265                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1266                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1267                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1268                 }
1269                 /* Set PIC-mode SCI trigger type */
1270                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1271                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1272         } else {
1273                 /*
1274                  * now that acpi_gbl_FADT is initialized,
1275                  * update it with result from INT_SRC_OVR parsing
1276                  */
1277                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1278         }
1279 #endif
1280         return;
1281
1282  error0:
1283         disable_acpi();
1284 }
1285
1286 /**
1287  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1288  *
1289  * Switch over the platform to the ACPI mode (if possible).
1290  *
1291  * Doing this too early is generally unsafe, but at the same time it needs to be
1292  * done before all things that really depend on ACPI.  The right spot appears to
1293  * be before finalizing the EFI initialization.
1294  */
1295 void __init acpi_subsystem_init(void)
1296 {
1297         acpi_status status;
1298
1299         if (acpi_disabled)
1300                 return;
1301
1302         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1303         if (ACPI_FAILURE(status)) {
1304                 pr_err("Unable to enable ACPI\n");
1305                 disable_acpi();
1306         } else {
1307                 /*
1308                  * If the system is using ACPI then we can be reasonably
1309                  * confident that any regulators are managed by the firmware
1310                  * so tell the regulator core it has everything it needs to
1311                  * know.
1312                  */
1313                 regulator_has_full_constraints();
1314         }
1315 }
1316
1317 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1318 {
1319         if (event == ACPI_TABLE_EVENT_LOAD)
1320                 acpi_scan_table_notify();
1321
1322         return acpi_sysfs_table_handler(event, table, context);
1323 }
1324
1325 static int __init acpi_bus_init(void)
1326 {
1327         int result;
1328         acpi_status status;
1329
1330         acpi_os_initialize1();
1331
1332         status = acpi_load_tables();
1333         if (ACPI_FAILURE(status)) {
1334                 pr_err("Unable to load the System Description Tables\n");
1335                 goto error1;
1336         }
1337
1338         /*
1339          * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1340          * device is found in the namespace.
1341          *
1342          * This is accomplished by looking for the ECDT table and getting the EC
1343          * parameters out of that.
1344          *
1345          * Do that before calling acpi_initialize_objects() which may trigger EC
1346          * address space accesses.
1347          */
1348         acpi_ec_ecdt_probe();
1349
1350         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1351         if (ACPI_FAILURE(status)) {
1352                 pr_err("Unable to start the ACPI Interpreter\n");
1353                 goto error1;
1354         }
1355
1356         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1357         if (ACPI_FAILURE(status)) {
1358                 pr_err("Unable to initialize ACPI objects\n");
1359                 goto error1;
1360         }
1361
1362         /*
1363          * _OSC method may exist in module level code,
1364          * so it must be run after ACPI_FULL_INITIALIZATION
1365          */
1366         acpi_bus_osc_negotiate_platform_control();
1367         acpi_bus_osc_negotiate_usb_control();
1368
1369         /*
1370          * _PDC control method may load dynamic SSDT tables,
1371          * and we need to install the table handler before that.
1372          */
1373         status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1374
1375         acpi_sysfs_init();
1376
1377         acpi_early_processor_control_setup();
1378
1379         /*
1380          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1381          * is necessary to enable it as early as possible.
1382          */
1383         acpi_ec_dsdt_probe();
1384
1385         pr_info("Interpreter enabled\n");
1386
1387         /* Initialize sleep structures */
1388         acpi_sleep_init();
1389
1390         /*
1391          * Get the system interrupt model and evaluate \_PIC.
1392          */
1393         result = acpi_bus_init_irq();
1394         if (result)
1395                 goto error1;
1396
1397         /*
1398          * Register the for all standard device notifications.
1399          */
1400         status =
1401             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1402                                         &acpi_bus_notify, NULL);
1403         if (ACPI_FAILURE(status)) {
1404                 pr_err("Unable to register for system notifications\n");
1405                 goto error1;
1406         }
1407
1408         /*
1409          * Create the top ACPI proc directory
1410          */
1411         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1412
1413         result = bus_register(&acpi_bus_type);
1414         if (!result)
1415                 return 0;
1416
1417         /* Mimic structured exception handling */
1418       error1:
1419         acpi_terminate();
1420         return -ENODEV;
1421 }
1422
1423 struct kobject *acpi_kobj;
1424 EXPORT_SYMBOL_GPL(acpi_kobj);
1425
1426 static int __init acpi_init(void)
1427 {
1428         int result;
1429
1430         if (acpi_disabled) {
1431                 pr_info("Interpreter disabled.\n");
1432                 return -ENODEV;
1433         }
1434
1435         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1436         if (!acpi_kobj)
1437                 pr_debug("%s: kset create error\n", __func__);
1438
1439         init_prmt();
1440         acpi_init_pcc();
1441         result = acpi_bus_init();
1442         if (result) {
1443                 kobject_put(acpi_kobj);
1444                 disable_acpi();
1445                 return result;
1446         }
1447         acpi_init_ffh();
1448
1449         pci_mmcfg_late_init();
1450         acpi_viot_early_init();
1451         acpi_hest_init();
1452         acpi_ghes_init();
1453         acpi_arm_init();
1454         acpi_scan_init();
1455         acpi_ec_init();
1456         acpi_debugfs_init();
1457         acpi_sleep_proc_init();
1458         acpi_wakeup_device_init();
1459         acpi_debugger_init();
1460         acpi_setup_sb_notify_handler();
1461         acpi_viot_init();
1462         return 0;
1463 }
1464
1465 subsys_initcall(acpi_init);