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 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/ioport.h>
  11 #include <linux/kernel.h>
  12 #include <linux/list.h>
  13 #include <linux/sched.h>
  14 #include <linux/pm.h>
  15 #include <linux/device.h>
  16 #include <linux/proc_fs.h>
  17 #include <linux/acpi.h>
  18 #include <linux/slab.h>
  19 #include <linux/regulator/machine.h>
  20 #include <linux/workqueue.h>
  21 #include <linux/reboot.h>
  22 #include <linux/delay.h>
  23 #ifdef CONFIG_X86
  24 #include <asm/mpspec.h>
  25 #include <linux/dmi.h>
  26 #endif
  27 #include <linux/acpi_iort.h>
  28 #include <linux/pci.h>
  29 #include <acpi/apei.h>
  30 #include <linux/suspend.h>
  31
  32 #include "internal.h"
  33
  34 #define _COMPONENT              ACPI_BUS_COMPONENT
  35 ACPI_MODULE_NAME("bus");
  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         printk(KERN_NOTICE "%s detected - "
  51                 "force copy of DSDT to local memory\n", id->ident);
  52         acpi_gbl_copy_dsdt_locally = 1;
  53         return 0;
  54 }
  55 #endif
  56
  57 static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
  58         /*
  59          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  60          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  61          */
  62         {
  63          .callback = set_copy_dsdt,
  64          .ident = "TOSHIBA Satellite",
  65          .matches = {
  66                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  67                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  68                 },
  69         },
  70         {}
  71 };
  72 #endif
  73
  74 /* --------------------------------------------------------------------------
  75                                 Device Management
  76    -------------------------------------------------------------------------- */
  77
  78 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  79                                        unsigned long long *sta)
  80 {
  81         acpi_status status;
  82
  83         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  84         if (ACPI_SUCCESS(status))
  85                 return AE_OK;
  86
  87         if (status == AE_NOT_FOUND) {
  88                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
  89                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
  90                 return AE_OK;
  91         }
  92         return status;
  93 }
  94 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
  95
  96 int acpi_bus_get_status(struct acpi_device *device)
  97 {
  98         acpi_status status;
  99         unsigned long long sta;
 100
 101         if (acpi_device_always_present(device)) {
 102                 acpi_set_device_status(device, ACPI_STA_DEFAULT);
 103                 return 0;
 104         }
 105
 106         /* Battery devices must have their deps met before calling _STA */
 107         if (acpi_device_is_battery(device) && device->dep_unmet) {
 108                 acpi_set_device_status(device, 0);
 109                 return 0;
 110         }
 111
 112         status = acpi_bus_get_status_handle(device->handle, &sta);
 113         if (ACPI_FAILURE(status))
 114                 return -ENODEV;
 115
 116         acpi_set_device_status(device, sta);
 117
 118         if (device->status.functional && !device->status.present) {
 119                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 120                        "functional but not present;\n",
 121                         device->pnp.bus_id, (u32)sta));
 122         }
 123
 124         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 125                           device->pnp.bus_id, (u32)sta));
 126         return 0;
 127 }
 128 EXPORT_SYMBOL(acpi_bus_get_status);
 129
 130 void acpi_bus_private_data_handler(acpi_handle handle,
 131                                    void *context)
 132 {
 133         return;
 134 }
 135 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 136
 137 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
 138 {
 139         acpi_status status;
 140
 141         status = acpi_attach_data(handle,
 142                         acpi_bus_private_data_handler, data);
 143         if (ACPI_FAILURE(status)) {
 144                 acpi_handle_debug(handle, "Error attaching device data\n");
 145                 return -ENODEV;
 146         }
 147
 148         return 0;
 149 }
 150 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
 151
 152 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 153 {
 154         acpi_status status;
 155
 156         if (!data)
 157                 return -EINVAL;
 158
 159         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 160         if (ACPI_FAILURE(status)) {
 161                 acpi_handle_debug(handle, "No context for object\n");
 162                 return -ENODEV;
 163         }
 164
 165         return 0;
 166 }
 167 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
 168
 169 void acpi_bus_detach_private_data(acpi_handle handle)
 170 {
 171         acpi_detach_data(handle, acpi_bus_private_data_handler);
 172 }
 173 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
 174
 175 static void acpi_print_osc_error(acpi_handle handle,
 176                                  struct acpi_osc_context *context, char *error)
 177 {
 178         int i;
 179
 180         acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
 181
 182         pr_debug("_OSC request data:");
 183         for (i = 0; i < context->cap.length; i += sizeof(u32))
 184                 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
 185
 186         pr_debug("\n");
 187 }
 188
 189 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 190 {
 191         acpi_status status;
 192         struct acpi_object_list input;
 193         union acpi_object in_params[4];
 194         union acpi_object *out_obj;
 195         guid_t guid;
 196         u32 errors;
 197         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 198
 199         if (!context)
 200                 return AE_ERROR;
 201         if (guid_parse(context->uuid_str, &guid))
 202                 return AE_ERROR;
 203         context->ret.length = ACPI_ALLOCATE_BUFFER;
 204         context->ret.pointer = NULL;
 205
 206         /* Setting up input parameters */
 207         input.count = 4;
 208         input.pointer = in_params;
 209         in_params[0].type               = ACPI_TYPE_BUFFER;
 210         in_params[0].buffer.length      = 16;
 211         in_params[0].buffer.pointer     = (u8 *)&guid;
 212         in_params[1].type               = ACPI_TYPE_INTEGER;
 213         in_params[1].integer.value      = context->rev;
 214         in_params[2].type               = ACPI_TYPE_INTEGER;
 215         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 216         in_params[3].type               = ACPI_TYPE_BUFFER;
 217         in_params[3].buffer.length      = context->cap.length;
 218         in_params[3].buffer.pointer     = context->cap.pointer;
 219
 220         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 221         if (ACPI_FAILURE(status))
 222                 return status;
 223
 224         if (!output.length)
 225                 return AE_NULL_OBJECT;
 226
 227         out_obj = output.pointer;
 228         if (out_obj->type != ACPI_TYPE_BUFFER
 229                 || out_obj->buffer.length != context->cap.length) {
 230                 acpi_print_osc_error(handle, context,
 231                         "_OSC evaluation returned wrong type");
 232                 status = AE_TYPE;
 233                 goto out_kfree;
 234         }
 235         /* Need to ignore the bit0 in result code */
 236         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 237         if (errors) {
 238                 if (errors & OSC_REQUEST_ERROR)
 239                         acpi_print_osc_error(handle, context,
 240                                 "_OSC request failed");
 241                 if (errors & OSC_INVALID_UUID_ERROR)
 242                         acpi_print_osc_error(handle, context,
 243                                 "_OSC invalid UUID");
 244                 if (errors & OSC_INVALID_REVISION_ERROR)
 245                         acpi_print_osc_error(handle, context,
 246                                 "_OSC invalid revision");
 247                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 248                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 249                             & OSC_QUERY_ENABLE)
 250                                 goto out_success;
 251                         status = AE_SUPPORT;
 252                         goto out_kfree;
 253                 }
 254                 status = AE_ERROR;
 255                 goto out_kfree;
 256         }
 257 out_success:
 258         context->ret.length = out_obj->buffer.length;
 259         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 260                                        context->ret.length, GFP_KERNEL);
 261         if (!context->ret.pointer) {
 262                 status =  AE_NO_MEMORY;
 263                 goto out_kfree;
 264         }
 265         status =  AE_OK;
 266
 267 out_kfree:
 268         kfree(output.pointer);
 269         if (status != AE_OK)
 270                 context->ret.pointer = NULL;
 271         return status;
 272 }
 273 EXPORT_SYMBOL(acpi_run_osc);
 274
 275 bool osc_sb_apei_support_acked;
 276
 277 /*
 278  * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
 279  * OSPM supports platform coordinated low power idle(LPI) states
 280  */
 281 bool osc_pc_lpi_support_confirmed;
 282 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
 283
 284 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 285 static void acpi_bus_osc_support(void)
 286 {
 287         u32 capbuf[2];
 288         struct acpi_osc_context context = {
 289                 .uuid_str = sb_uuid_str,
 290                 .rev = 1,
 291                 .cap.length = 8,
 292                 .cap.pointer = capbuf,
 293         };
 294         acpi_handle handle;
 295
 296         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 297         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 298         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
 299                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 300         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 301                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 302
 303         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 304         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
 305
 306 #ifdef CONFIG_ARM64
 307         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 308 #endif
 309 #ifdef CONFIG_X86
 310         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 311         if (boot_cpu_has(X86_FEATURE_HWP)) {
 312                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
 313                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
 314         }
 315 #endif
 316
 317         if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
 318                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
 319
 320         if (!ghes_disable)
 321                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 322         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 323                 return;
 324         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 325                 u32 *capbuf_ret = context.ret.pointer;
 326                 if (context.ret.length > OSC_SUPPORT_DWORD) {
 327                         osc_sb_apei_support_acked =
 328                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 329                         osc_pc_lpi_support_confirmed =
 330                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
 331                 }
 332                 kfree(context.ret.pointer);
 333         }
 334         /* do we need to check other returned cap? Sounds no */
 335 }
 336
 337 /* --------------------------------------------------------------------------
 338                              Notification Handling
 339    -------------------------------------------------------------------------- */
 340
 341 /**
 342  * acpi_bus_notify
 343  * ---------------
 344  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 345  */
 346 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 347 {
 348         struct acpi_device *adev;
 349         struct acpi_driver *driver;
 350         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 351         bool hotplug_event = false;
 352
 353         switch (type) {
 354         case ACPI_NOTIFY_BUS_CHECK:
 355                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 356                 hotplug_event = true;
 357                 break;
 358
 359         case ACPI_NOTIFY_DEVICE_CHECK:
 360                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 361                 hotplug_event = true;
 362                 break;
 363
 364         case ACPI_NOTIFY_DEVICE_WAKE:
 365                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 366                 break;
 367
 368         case ACPI_NOTIFY_EJECT_REQUEST:
 369                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 370                 hotplug_event = true;
 371                 break;
 372
 373         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 374                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 375                 /* TBD: Exactly what does 'light' mean? */
 376                 break;
 377
 378         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 379                 acpi_handle_err(handle, "Device cannot be configured due "
 380                                 "to a frequency mismatch\n");
 381                 break;
 382
 383         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 384                 acpi_handle_err(handle, "Device cannot be configured due "
 385                                 "to a bus mode mismatch\n");
 386                 break;
 387
 388         case ACPI_NOTIFY_POWER_FAULT:
 389                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 390                 break;
 391
 392         default:
 393                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 394                 break;
 395         }
 396
 397         adev = acpi_bus_get_acpi_device(handle);
 398         if (!adev)
 399                 goto err;
 400
 401         driver = adev->driver;
 402         if (driver && driver->ops.notify &&
 403             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 404                 driver->ops.notify(adev, type);
 405
 406         if (!hotplug_event) {
 407                 acpi_bus_put_acpi_device(adev);
 408                 return;
 409         }
 410
 411         if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 412                 return;
 413
 414         acpi_bus_put_acpi_device(adev);
 415
 416  err:
 417         acpi_evaluate_ost(handle, type, ost_code, NULL);
 418 }
 419
 420 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 421 {
 422         struct acpi_device *device = data;
 423
 424         device->driver->ops.notify(device, event);
 425 }
 426
 427 static void acpi_device_notify_fixed(void *data)
 428 {
 429         struct acpi_device *device = data;
 430
 431         /* Fixed hardware devices have no handles */
 432         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 433 }
 434
 435 static u32 acpi_device_fixed_event(void *data)
 436 {
 437         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
 438         return ACPI_INTERRUPT_HANDLED;
 439 }
 440
 441 static int acpi_device_install_notify_handler(struct acpi_device *device)
 442 {
 443         acpi_status status;
 444
 445         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 446                 status =
 447                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 448                                                      acpi_device_fixed_event,
 449                                                      device);
 450         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 451                 status =
 452                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 453                                                      acpi_device_fixed_event,
 454                                                      device);
 455         else
 456                 status = acpi_install_notify_handler(device->handle,
 457                                                      ACPI_DEVICE_NOTIFY,
 458                                                      acpi_device_notify,
 459                                                      device);
 460
 461         if (ACPI_FAILURE(status))
 462                 return -EINVAL;
 463         return 0;
 464 }
 465
 466 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 467 {
 468         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 469                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 470                                                 acpi_device_fixed_event);
 471         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 472                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 473                                                 acpi_device_fixed_event);
 474         else
 475                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 476                                            acpi_device_notify);
 477 }
 478
 479 /* Handle events targeting \_SB device (at present only graceful shutdown) */
 480
 481 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 482 #define ACPI_SB_INDICATE_INTERVAL       10000
 483
 484 static void sb_notify_work(struct work_struct *dummy)
 485 {
 486         acpi_handle sb_handle;
 487
 488         orderly_poweroff(true);
 489
 490         /*
 491          * After initiating graceful shutdown, the ACPI spec requires OSPM
 492          * to evaluate _OST method once every 10seconds to indicate that
 493          * the shutdown is in progress
 494          */
 495         acpi_get_handle(NULL, "\\_SB", &sb_handle);
 496         while (1) {
 497                 pr_info("Graceful shutdown in progress.\n");
 498                 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 499                                 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 500                 msleep(ACPI_SB_INDICATE_INTERVAL);
 501         }
 502 }
 503
 504 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 505 {
 506         static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 507
 508         if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 509                 if (!work_busy(&acpi_sb_work))
 510                         schedule_work(&acpi_sb_work);
 511         } else
 512                 pr_warn("event %x is not supported by \\_SB device\n", event);
 513 }
 514
 515 static int __init acpi_setup_sb_notify_handler(void)
 516 {
 517         acpi_handle sb_handle;
 518
 519         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 520                 return -ENXIO;
 521
 522         if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 523                                                 acpi_sb_notify, NULL)))
 524                 return -EINVAL;
 525
 526         return 0;
 527 }
 528
 529 /* --------------------------------------------------------------------------
 530                              Device Matching
 531    -------------------------------------------------------------------------- */
 532
 533 /**
 534  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 535  * @adev:       ACPI device in question
 536  *
 537  * Return: First physical node of ACPI device @adev
 538  */
 539 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 540 {
 541         struct mutex *physical_node_lock = &adev->physical_node_lock;
 542         struct device *phys_dev;
 543
 544         mutex_lock(physical_node_lock);
 545         if (list_empty(&adev->physical_node_list)) {
 546                 phys_dev = NULL;
 547         } else {
 548                 const struct acpi_device_physical_node *node;
 549
 550                 node = list_first_entry(&adev->physical_node_list,
 551                                         struct acpi_device_physical_node, node);
 552
 553                 phys_dev = node->dev;
 554         }
 555         mutex_unlock(physical_node_lock);
 556         return phys_dev;
 557 }
 558
 559 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 560                                                       const struct device *dev)
 561 {
 562         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 563
 564         return phys_dev && phys_dev == dev ? adev : NULL;
 565 }
 566
 567 /**
 568  * acpi_device_is_first_physical_node - Is given dev first physical node
 569  * @adev: ACPI companion device
 570  * @dev: Physical device to check
 571  *
 572  * Function checks if given @dev is the first physical devices attached to
 573  * the ACPI companion device. This distinction is needed in some cases
 574  * where the same companion device is shared between many physical devices.
 575  *
 576  * Note that the caller have to provide valid @adev pointer.
 577  */
 578 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 579                                         const struct device *dev)
 580 {
 581         return !!acpi_primary_dev_companion(adev, dev);
 582 }
 583
 584 /*
 585  * acpi_companion_match() - Can we match via ACPI companion device
 586  * @dev: Device in question
 587  *
 588  * Check if the given device has an ACPI companion and if that companion has
 589  * a valid list of PNP IDs, and if the device is the first (primary) physical
 590  * device associated with it.  Return the companion pointer if that's the case
 591  * or NULL otherwise.
 592  *
 593  * If multiple physical devices are attached to a single ACPI companion, we need
 594  * to be careful.  The usage scenario for this kind of relationship is that all
 595  * of the physical devices in question use resources provided by the ACPI
 596  * companion.  A typical case is an MFD device where all the sub-devices share
 597  * the parent's ACPI companion.  In such cases we can only allow the primary
 598  * (first) physical device to be matched with the help of the companion's PNP
 599  * IDs.
 600  *
 601  * Additional physical devices sharing the ACPI companion can still use
 602  * resources available from it but they will be matched normally using functions
 603  * provided by their bus types (and analogously for their modalias).
 604  */
 605 struct acpi_device *acpi_companion_match(const struct device *dev)
 606 {
 607         struct acpi_device *adev;
 608
 609         adev = ACPI_COMPANION(dev);
 610         if (!adev)
 611                 return NULL;
 612
 613         if (list_empty(&adev->pnp.ids))
 614                 return NULL;
 615
 616         return acpi_primary_dev_companion(adev, dev);
 617 }
 618
 619 /**
 620  * acpi_of_match_device - Match device object using the "compatible" property.
 621  * @adev: ACPI device object to match.
 622  * @of_match_table: List of device IDs to match against.
 623  * @of_id: OF ID if matched
 624  *
 625  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 626  * identifiers and a _DSD object with the "compatible" property, use that
 627  * property to match against the given list of identifiers.
 628  */
 629 static bool acpi_of_match_device(struct acpi_device *adev,
 630                                  const struct of_device_id *of_match_table,
 631                                  const struct of_device_id **of_id)
 632 {
 633         const union acpi_object *of_compatible, *obj;
 634         int i, nval;
 635
 636         if (!adev)
 637                 return false;
 638
 639         of_compatible = adev->data.of_compatible;
 640         if (!of_match_table || !of_compatible)
 641                 return false;
 642
 643         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 644                 nval = of_compatible->package.count;
 645                 obj = of_compatible->package.elements;
 646         } else { /* Must be ACPI_TYPE_STRING. */
 647                 nval = 1;
 648                 obj = of_compatible;
 649         }
 650         /* Now we can look for the driver DT compatible strings */
 651         for (i = 0; i < nval; i++, obj++) {
 652                 const struct of_device_id *id;
 653
 654                 for (id = of_match_table; id->compatible[0]; id++)
 655                         if (!strcasecmp(obj->string.pointer, id->compatible)) {
 656                                 if (of_id)
 657                                         *of_id = id;
 658                                 return true;
 659                         }
 660         }
 661
 662         return false;
 663 }
 664
 665 static bool acpi_of_modalias(struct acpi_device *adev,
 666                              char *modalias, size_t len)
 667 {
 668         const union acpi_object *of_compatible;
 669         const union acpi_object *obj;
 670         const char *str, *chr;
 671
 672         of_compatible = adev->data.of_compatible;
 673         if (!of_compatible)
 674                 return false;
 675
 676         if (of_compatible->type == ACPI_TYPE_PACKAGE)
 677                 obj = of_compatible->package.elements;
 678         else /* Must be ACPI_TYPE_STRING. */
 679                 obj = of_compatible;
 680
 681         str = obj->string.pointer;
 682         chr = strchr(str, ',');
 683         strlcpy(modalias, chr ? chr + 1 : str, len);
 684
 685         return true;
 686 }
 687
 688 /**
 689  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 690  * @adev:       ACPI device object to match
 691  * @default_id: ID string to use as default if no compatible string found
 692  * @modalias:   Pointer to buffer that modalias value will be copied into
 693  * @len:        Length of modalias buffer
 694  *
 695  * This is a counterpart of of_modalias_node() for struct acpi_device objects.
 696  * If there is a compatible string for @adev, it will be copied to @modalias
 697  * with the vendor prefix stripped; otherwise, @default_id will be used.
 698  */
 699 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 700                        char *modalias, size_t len)
 701 {
 702         if (!acpi_of_modalias(adev, modalias, len))
 703                 strlcpy(modalias, default_id, len);
 704 }
 705 EXPORT_SYMBOL_GPL(acpi_set_modalias);
 706
 707 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 708                                     struct acpi_hardware_id *hwid)
 709 {
 710         int i, msk, byte_shift;
 711         char buf[3];
 712
 713         if (!id->cls)
 714                 return false;
 715
 716         /* Apply class-code bitmask, before checking each class-code byte */
 717         for (i = 1; i <= 3; i++) {
 718                 byte_shift = 8 * (3 - i);
 719                 msk = (id->cls_msk >> byte_shift) & 0xFF;
 720                 if (!msk)
 721                         continue;
 722
 723                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 724                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 725                         return false;
 726         }
 727         return true;
 728 }
 729
 730 static bool __acpi_match_device(struct acpi_device *device,
 731                                 const struct acpi_device_id *acpi_ids,
 732                                 const struct of_device_id *of_ids,
 733                                 const struct acpi_device_id **acpi_id,
 734                                 const struct of_device_id **of_id)
 735 {
 736         const struct acpi_device_id *id;
 737         struct acpi_hardware_id *hwid;
 738
 739         /*
 740          * If the device is not present, it is unnecessary to load device
 741          * driver for it.
 742          */
 743         if (!device || !device->status.present)
 744                 return false;
 745
 746         list_for_each_entry(hwid, &device->pnp.ids, list) {
 747                 /* First, check the ACPI/PNP IDs provided by the caller. */
 748                 if (acpi_ids) {
 749                         for (id = acpi_ids; id->id[0] || id->cls; id++) {
 750                                 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
 751                                         goto out_acpi_match;
 752                                 if (id->cls && __acpi_match_device_cls(id, hwid))
 753                                         goto out_acpi_match;
 754                         }
 755                 }
 756
 757                 /*
 758                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 759                  * "compatible" property if found.
 760                  */
 761                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
 762                         return acpi_of_match_device(device, of_ids, of_id);
 763         }
 764         return false;
 765
 766 out_acpi_match:
 767         if (acpi_id)
 768                 *acpi_id = id;
 769         return true;
 770 }
 771
 772 /**
 773  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 774  * @ids: Array of struct acpi_device_id object to match against.
 775  * @dev: The device structure to match.
 776  *
 777  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 778  * object for that handle and use that object to match against a given list of
 779  * device IDs.
 780  *
 781  * Return a pointer to the first matching ID on success or %NULL on failure.
 782  */
 783 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 784                                                const struct device *dev)
 785 {
 786         const struct acpi_device_id *id = NULL;
 787
 788         __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
 789         return id;
 790 }
 791 EXPORT_SYMBOL_GPL(acpi_match_device);
 792
 793 static const void *acpi_of_device_get_match_data(const struct device *dev)
 794 {
 795         struct acpi_device *adev = ACPI_COMPANION(dev);
 796         const struct of_device_id *match = NULL;
 797
 798         if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
 799                 return NULL;
 800
 801         return match->data;
 802 }
 803
 804 const void *acpi_device_get_match_data(const struct device *dev)
 805 {
 806         const struct acpi_device_id *match;
 807
 808         if (!dev->driver->acpi_match_table)
 809                 return acpi_of_device_get_match_data(dev);
 810
 811         match = acpi_match_device(dev->driver->acpi_match_table, dev);
 812         if (!match)
 813                 return NULL;
 814
 815         return (const void *)match->driver_data;
 816 }
 817 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 818
 819 int acpi_match_device_ids(struct acpi_device *device,
 820                           const struct acpi_device_id *ids)
 821 {
 822         return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
 823 }
 824 EXPORT_SYMBOL(acpi_match_device_ids);
 825
 826 bool acpi_driver_match_device(struct device *dev,
 827                               const struct device_driver *drv)
 828 {
 829         if (!drv->acpi_match_table)
 830                 return acpi_of_match_device(ACPI_COMPANION(dev),
 831                                             drv->of_match_table,
 832                                             NULL);
 833
 834         return __acpi_match_device(acpi_companion_match(dev),
 835                                    drv->acpi_match_table, drv->of_match_table,
 836                                    NULL, NULL);
 837 }
 838 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 839
 840 /* --------------------------------------------------------------------------
 841                               ACPI Driver Management
 842    -------------------------------------------------------------------------- */
 843
 844 /**
 845  * acpi_bus_register_driver - register a driver with the ACPI bus
 846  * @driver: driver being registered
 847  *
 848  * Registers a driver with the ACPI bus.  Searches the namespace for all
 849  * devices that match the driver's criteria and binds.  Returns zero for
 850  * success or a negative error status for failure.
 851  */
 852 int acpi_bus_register_driver(struct acpi_driver *driver)
 853 {
 854         int ret;
 855
 856         if (acpi_disabled)
 857                 return -ENODEV;
 858         driver->drv.name = driver->name;
 859         driver->drv.bus = &acpi_bus_type;
 860         driver->drv.owner = driver->owner;
 861
 862         ret = driver_register(&driver->drv);
 863         return ret;
 864 }
 865
 866 EXPORT_SYMBOL(acpi_bus_register_driver);
 867
 868 /**
 869  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 870  * @driver: driver to unregister
 871  *
 872  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 873  * devices that match the driver's criteria and unbinds.
 874  */
 875 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 876 {
 877         driver_unregister(&driver->drv);
 878 }
 879
 880 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 881
 882 /* --------------------------------------------------------------------------
 883                               ACPI Bus operations
 884    -------------------------------------------------------------------------- */
 885
 886 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 887 {
 888         struct acpi_device *acpi_dev = to_acpi_device(dev);
 889         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 890
 891         return acpi_dev->flags.match_driver
 892                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 893 }
 894
 895 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 896 {
 897         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
 898 }
 899
 900 static int acpi_device_probe(struct device *dev)
 901 {
 902         struct acpi_device *acpi_dev = to_acpi_device(dev);
 903         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 904         int ret;
 905
 906         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
 907                 return -EINVAL;
 908
 909         if (!acpi_drv->ops.add)
 910                 return -ENOSYS;
 911
 912         ret = acpi_drv->ops.add(acpi_dev);
 913         if (ret)
 914                 return ret;
 915
 916         acpi_dev->driver = acpi_drv;
 917         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 918                           "Driver [%s] successfully bound to device [%s]\n",
 919                           acpi_drv->name, acpi_dev->pnp.bus_id));
 920
 921         if (acpi_drv->ops.notify) {
 922                 ret = acpi_device_install_notify_handler(acpi_dev);
 923                 if (ret) {
 924                         if (acpi_drv->ops.remove)
 925                                 acpi_drv->ops.remove(acpi_dev);
 926
 927                         acpi_dev->driver = NULL;
 928                         acpi_dev->driver_data = NULL;
 929                         return ret;
 930                 }
 931         }
 932
 933         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
 934                           acpi_drv->name, acpi_dev->pnp.bus_id));
 935         get_device(dev);
 936         return 0;
 937 }
 938
 939 static int acpi_device_remove(struct device *dev)
 940 {
 941         struct acpi_device *acpi_dev = to_acpi_device(dev);
 942         struct acpi_driver *acpi_drv = acpi_dev->driver;
 943
 944         if (acpi_drv) {
 945                 if (acpi_drv->ops.notify)
 946                         acpi_device_remove_notify_handler(acpi_dev);
 947                 if (acpi_drv->ops.remove)
 948                         acpi_drv->ops.remove(acpi_dev);
 949         }
 950         acpi_dev->driver = NULL;
 951         acpi_dev->driver_data = NULL;
 952
 953         put_device(dev);
 954         return 0;
 955 }
 956
 957 struct bus_type acpi_bus_type = {
 958         .name           = "acpi",
 959         .match          = acpi_bus_match,
 960         .probe          = acpi_device_probe,
 961         .remove         = acpi_device_remove,
 962         .uevent         = acpi_device_uevent,
 963 };
 964
 965 /* --------------------------------------------------------------------------
 966                              Initialization/Cleanup
 967    -------------------------------------------------------------------------- */
 968
 969 static int __init acpi_bus_init_irq(void)
 970 {
 971         acpi_status status;
 972         char *message = NULL;
 973
 974
 975         /*
 976          * Let the system know what interrupt model we are using by
 977          * evaluating the \_PIC object, if exists.
 978          */
 979
 980         switch (acpi_irq_model) {
 981         case ACPI_IRQ_MODEL_PIC:
 982                 message = "PIC";
 983                 break;
 984         case ACPI_IRQ_MODEL_IOAPIC:
 985                 message = "IOAPIC";
 986                 break;
 987         case ACPI_IRQ_MODEL_IOSAPIC:
 988                 message = "IOSAPIC";
 989                 break;
 990         case ACPI_IRQ_MODEL_GIC:
 991                 message = "GIC";
 992                 break;
 993         case ACPI_IRQ_MODEL_PLATFORM:
 994                 message = "platform specific model";
 995                 break;
 996         default:
 997                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 998                 return -ENODEV;
 999         }
1000
1001         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
1002
1003         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1004         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1005                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
1006                 return -ENODEV;
1007         }
1008
1009         return 0;
1010 }
1011
1012 /**
1013  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1014  *
1015  * The ACPI tables are accessible after this, but the handling of events has not
1016  * been initialized and the global lock is not available yet, so AML should not
1017  * be executed at this point.
1018  *
1019  * Doing this before switching the EFI runtime services to virtual mode allows
1020  * the EfiBootServices memory to be freed slightly earlier on boot.
1021  */
1022 void __init acpi_early_init(void)
1023 {
1024         acpi_status status;
1025
1026         if (acpi_disabled)
1027                 return;
1028
1029         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
1030
1031         /* enable workarounds, unless strict ACPI spec. compliance */
1032         if (!acpi_strict)
1033                 acpi_gbl_enable_interpreter_slack = TRUE;
1034
1035         acpi_permanent_mmap = true;
1036
1037 #ifdef CONFIG_X86
1038         /*
1039          * If the machine falls into the DMI check table,
1040          * DSDT will be copied to memory.
1041          * Note that calling dmi_check_system() here on other architectures
1042          * would not be OK because only x86 initializes dmi early enough.
1043          * Thankfully only x86 systems need such quirks for now.
1044          */
1045         dmi_check_system(dsdt_dmi_table);
1046 #endif
1047
1048         status = acpi_reallocate_root_table();
1049         if (ACPI_FAILURE(status)) {
1050                 printk(KERN_ERR PREFIX
1051                        "Unable to reallocate ACPI tables\n");
1052                 goto error0;
1053         }
1054
1055         status = acpi_initialize_subsystem();
1056         if (ACPI_FAILURE(status)) {
1057                 printk(KERN_ERR PREFIX
1058                        "Unable to initialize the ACPI Interpreter\n");
1059                 goto error0;
1060         }
1061
1062 #ifdef CONFIG_X86
1063         if (!acpi_ioapic) {
1064                 /* compatible (0) means level (3) */
1065                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1066                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1067                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1068                 }
1069                 /* Set PIC-mode SCI trigger type */
1070                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1071                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1072         } else {
1073                 /*
1074                  * now that acpi_gbl_FADT is initialized,
1075                  * update it with result from INT_SRC_OVR parsing
1076                  */
1077                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1078         }
1079 #endif
1080         return;
1081
1082  error0:
1083         disable_acpi();
1084 }
1085
1086 /**
1087  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1088  *
1089  * Switch over the platform to the ACPI mode (if possible).
1090  *
1091  * Doing this too early is generally unsafe, but at the same time it needs to be
1092  * done before all things that really depend on ACPI.  The right spot appears to
1093  * be before finalizing the EFI initialization.
1094  */
1095 void __init acpi_subsystem_init(void)
1096 {
1097         acpi_status status;
1098
1099         if (acpi_disabled)
1100                 return;
1101
1102         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1103         if (ACPI_FAILURE(status)) {
1104                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
1105                 disable_acpi();
1106         } else {
1107                 /*
1108                  * If the system is using ACPI then we can be reasonably
1109                  * confident that any regulators are managed by the firmware
1110                  * so tell the regulator core it has everything it needs to
1111                  * know.
1112                  */
1113                 regulator_has_full_constraints();
1114         }
1115 }
1116
1117 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1118 {
1119         acpi_scan_table_handler(event, table, context);
1120
1121         return acpi_sysfs_table_handler(event, table, context);
1122 }
1123
1124 static int __init acpi_bus_init(void)
1125 {
1126         int result;
1127         acpi_status status;
1128
1129         acpi_os_initialize1();
1130
1131         status = acpi_load_tables();
1132         if (ACPI_FAILURE(status)) {
1133                 printk(KERN_ERR PREFIX
1134                        "Unable to load the System Description Tables\n");
1135                 goto error1;
1136         }
1137
1138         /*
1139          * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1140          * device is found in the namespace.
1141          *
1142          * This is accomplished by looking for the ECDT table and getting the EC
1143          * parameters out of that.
1144          *
1145          * Do that before calling acpi_initialize_objects() which may trigger EC
1146          * address space accesses.
1147          */
1148         acpi_ec_ecdt_probe();
1149
1150         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1151         if (ACPI_FAILURE(status)) {
1152                 printk(KERN_ERR PREFIX
1153                        "Unable to start the ACPI Interpreter\n");
1154                 goto error1;
1155         }
1156
1157         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1158         if (ACPI_FAILURE(status)) {
1159                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1160                 goto error1;
1161         }
1162
1163         /* Set capability bits for _OSC under processor scope */
1164         acpi_early_processor_osc();
1165
1166         /*
1167          * _OSC method may exist in module level code,
1168          * so it must be run after ACPI_FULL_INITIALIZATION
1169          */
1170         acpi_bus_osc_support();
1171
1172         /*
1173          * _PDC control method may load dynamic SSDT tables,
1174          * and we need to install the table handler before that.
1175          */
1176         status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1177
1178         acpi_sysfs_init();
1179
1180         acpi_early_processor_set_pdc();
1181
1182         /*
1183          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1184          * is necessary to enable it as early as possible.
1185          */
1186         acpi_ec_dsdt_probe();
1187
1188         printk(KERN_INFO PREFIX "Interpreter enabled\n");
1189
1190         /* Initialize sleep structures */
1191         acpi_sleep_init();
1192
1193         /*
1194          * Get the system interrupt model and evaluate \_PIC.
1195          */
1196         result = acpi_bus_init_irq();
1197         if (result)
1198                 goto error1;
1199
1200         /*
1201          * Register the for all standard device notifications.
1202          */
1203         status =
1204             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1205                                         &acpi_bus_notify, NULL);
1206         if (ACPI_FAILURE(status)) {
1207                 printk(KERN_ERR PREFIX
1208                        "Unable to register for device notifications\n");
1209                 goto error1;
1210         }
1211
1212         /*
1213          * Create the top ACPI proc directory
1214          */
1215         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1216
1217         result = bus_register(&acpi_bus_type);
1218         if (!result)
1219                 return 0;
1220
1221         /* Mimic structured exception handling */
1222       error1:
1223         acpi_terminate();
1224         return -ENODEV;
1225 }
1226
1227 struct kobject *acpi_kobj;
1228 EXPORT_SYMBOL_GPL(acpi_kobj);
1229
1230 static int __init acpi_init(void)
1231 {
1232         int result;
1233
1234         if (acpi_disabled) {
1235                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1236                 return -ENODEV;
1237         }
1238
1239         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1240         if (!acpi_kobj) {
1241                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1242                 acpi_kobj = NULL;
1243         }
1244
1245         result = acpi_bus_init();
1246         if (result) {
1247                 disable_acpi();
1248                 return result;
1249         }
1250
1251         pci_mmcfg_late_init();
1252         acpi_iort_init();
1253         acpi_scan_init();
1254         acpi_ec_init();
1255         acpi_debugfs_init();
1256         acpi_sleep_proc_init();
1257         acpi_wakeup_device_init();
1258         acpi_debugger_init();
1259         acpi_setup_sb_notify_handler();
1260         return 0;
1261 }
1262
1263 subsys_initcall(acpi_init);