drivers/acpi/scan.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * scan.c - support for transforming the ACPI namespace into individual objects
   4  */
   5
   6 #define pr_fmt(fmt) "ACPI: " fmt
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/slab.h>
  11 #include <linux/kernel.h>
  12 #include <linux/acpi.h>
  13 #include <linux/acpi_iort.h>
  14 #include <linux/acpi_viot.h>
  15 #include <linux/iommu.h>
  16 #include <linux/signal.h>
  17 #include <linux/kthread.h>
  18 #include <linux/dmi.h>
  19 #include <linux/dma-map-ops.h>
  20 #include <linux/platform_data/x86/apple.h>
  21 #include <linux/pgtable.h>
  22 #include <linux/crc32.h>
  23 #include <linux/dma-direct.h>
  24
  25 #include "internal.h"
  26
  27 extern struct acpi_device *acpi_root;
  28
  29 #define ACPI_BUS_CLASS                  "system_bus"
  30 #define ACPI_BUS_HID                    "LNXSYBUS"
  31 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  32
  33 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  34
  35 #define INVALID_ACPI_HANDLE     ((acpi_handle)empty_zero_page)
  36
  37 static const char *dummy_hid = "device";
  38
  39 static LIST_HEAD(acpi_dep_list);
  40 static DEFINE_MUTEX(acpi_dep_list_lock);
  41 LIST_HEAD(acpi_bus_id_list);
  42 static DEFINE_MUTEX(acpi_scan_lock);
  43 static LIST_HEAD(acpi_scan_handlers_list);
  44 DEFINE_MUTEX(acpi_device_lock);
  45 LIST_HEAD(acpi_wakeup_device_list);
  46 static DEFINE_MUTEX(acpi_hp_context_lock);
  47
  48 /*
  49  * The UART device described by the SPCR table is the only object which needs
  50  * special-casing. Everything else is covered by ACPI namespace paths in STAO
  51  * table.
  52  */
  53 static u64 spcr_uart_addr;
  54
  55 void acpi_scan_lock_acquire(void)
  56 {
  57         mutex_lock(&acpi_scan_lock);
  58 }
  59 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  60
  61 void acpi_scan_lock_release(void)
  62 {
  63         mutex_unlock(&acpi_scan_lock);
  64 }
  65 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  66
  67 void acpi_lock_hp_context(void)
  68 {
  69         mutex_lock(&acpi_hp_context_lock);
  70 }
  71
  72 void acpi_unlock_hp_context(void)
  73 {
  74         mutex_unlock(&acpi_hp_context_lock);
  75 }
  76
  77 void acpi_initialize_hp_context(struct acpi_device *adev,
  78                                 struct acpi_hotplug_context *hp,
  79                                 int (*notify)(struct acpi_device *, u32),
  80                                 void (*uevent)(struct acpi_device *, u32))
  81 {
  82         acpi_lock_hp_context();
  83         hp->notify = notify;
  84         hp->uevent = uevent;
  85         acpi_set_hp_context(adev, hp);
  86         acpi_unlock_hp_context();
  87 }
  88 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  89
  90 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  91 {
  92         if (!handler)
  93                 return -EINVAL;
  94
  95         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  96         return 0;
  97 }
  98
  99 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 100                                        const char *hotplug_profile_name)
 101 {
 102         int error;
 103
 104         error = acpi_scan_add_handler(handler);
 105         if (error)
 106                 return error;
 107
 108         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 109         return 0;
 110 }
 111
 112 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 113 {
 114         struct acpi_device_physical_node *pn;
 115         bool offline = true;
 116         char *envp[] = { "EVENT=offline", NULL };
 117
 118         /*
 119          * acpi_container_offline() calls this for all of the container's
 120          * children under the container's physical_node_lock lock.
 121          */
 122         mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 123
 124         list_for_each_entry(pn, &adev->physical_node_list, node)
 125                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 126                         if (uevent)
 127                                 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
 128
 129                         offline = false;
 130                         break;
 131                 }
 132
 133         mutex_unlock(&adev->physical_node_lock);
 134         return offline;
 135 }
 136
 137 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 138                                     void **ret_p)
 139 {
 140         struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 141         struct acpi_device_physical_node *pn;
 142         bool second_pass = (bool)data;
 143         acpi_status status = AE_OK;
 144
 145         if (!device)
 146                 return AE_OK;
 147
 148         if (device->handler && !device->handler->hotplug.enabled) {
 149                 *ret_p = &device->dev;
 150                 return AE_SUPPORT;
 151         }
 152
 153         mutex_lock(&device->physical_node_lock);
 154
 155         list_for_each_entry(pn, &device->physical_node_list, node) {
 156                 int ret;
 157
 158                 if (second_pass) {
 159                         /* Skip devices offlined by the first pass. */
 160                         if (pn->put_online)
 161                                 continue;
 162                 } else {
 163                         pn->put_online = false;
 164                 }
 165                 ret = device_offline(pn->dev);
 166                 if (ret >= 0) {
 167                         pn->put_online = !ret;
 168                 } else {
 169                         *ret_p = pn->dev;
 170                         if (second_pass) {
 171                                 status = AE_ERROR;
 172                                 break;
 173                         }
 174                 }
 175         }
 176
 177         mutex_unlock(&device->physical_node_lock);
 178
 179         return status;
 180 }
 181
 182 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 183                                    void **ret_p)
 184 {
 185         struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 186         struct acpi_device_physical_node *pn;
 187
 188         if (!device)
 189                 return AE_OK;
 190
 191         mutex_lock(&device->physical_node_lock);
 192
 193         list_for_each_entry(pn, &device->physical_node_list, node)
 194                 if (pn->put_online) {
 195                         device_online(pn->dev);
 196                         pn->put_online = false;
 197                 }
 198
 199         mutex_unlock(&device->physical_node_lock);
 200
 201         return AE_OK;
 202 }
 203
 204 static int acpi_scan_try_to_offline(struct acpi_device *device)
 205 {
 206         acpi_handle handle = device->handle;
 207         struct device *errdev = NULL;
 208         acpi_status status;
 209
 210         /*
 211          * Carry out two passes here and ignore errors in the first pass,
 212          * because if the devices in question are memory blocks and
 213          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 214          * that the other blocks depend on, but it is not known in advance which
 215          * block holds them.
 216          *
 217          * If the first pass is successful, the second one isn't needed, though.
 218          */
 219         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 220                                      NULL, acpi_bus_offline, (void *)false,
 221                                      (void **)&errdev);
 222         if (status == AE_SUPPORT) {
 223                 dev_warn(errdev, "Offline disabled.\n");
 224                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 225                                     acpi_bus_online, NULL, NULL, NULL);
 226                 return -EPERM;
 227         }
 228         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 229         if (errdev) {
 230                 errdev = NULL;
 231                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 232                                     NULL, acpi_bus_offline, (void *)true,
 233                                     (void **)&errdev);
 234                 if (!errdev)
 235                         acpi_bus_offline(handle, 0, (void *)true,
 236                                          (void **)&errdev);
 237
 238                 if (errdev) {
 239                         dev_warn(errdev, "Offline failed.\n");
 240                         acpi_bus_online(handle, 0, NULL, NULL);
 241                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 242                                             ACPI_UINT32_MAX, acpi_bus_online,
 243                                             NULL, NULL, NULL);
 244                         return -EBUSY;
 245                 }
 246         }
 247         return 0;
 248 }
 249
 250 static int acpi_scan_hot_remove(struct acpi_device *device)
 251 {
 252         acpi_handle handle = device->handle;
 253         unsigned long long sta;
 254         acpi_status status;
 255
 256         if (device->handler && device->handler->hotplug.demand_offline) {
 257                 if (!acpi_scan_is_offline(device, true))
 258                         return -EBUSY;
 259         } else {
 260                 int error = acpi_scan_try_to_offline(device);
 261                 if (error)
 262                         return error;
 263         }
 264
 265         acpi_handle_debug(handle, "Ejecting\n");
 266
 267         acpi_bus_trim(device);
 268
 269         acpi_evaluate_lck(handle, 0);
 270         /*
 271          * TBD: _EJD support.
 272          */
 273         status = acpi_evaluate_ej0(handle);
 274         if (status == AE_NOT_FOUND)
 275                 return -ENODEV;
 276         else if (ACPI_FAILURE(status))
 277                 return -EIO;
 278
 279         /*
 280          * Verify if eject was indeed successful.  If not, log an error
 281          * message.  No need to call _OST since _EJ0 call was made OK.
 282          */
 283         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 284         if (ACPI_FAILURE(status)) {
 285                 acpi_handle_warn(handle,
 286                         "Status check after eject failed (0x%x)\n", status);
 287         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 288                 acpi_handle_warn(handle,
 289                         "Eject incomplete - status 0x%llx\n", sta);
 290         }
 291
 292         return 0;
 293 }
 294
 295 static int acpi_scan_device_not_present(struct acpi_device *adev)
 296 {
 297         if (!acpi_device_enumerated(adev)) {
 298                 dev_warn(&adev->dev, "Still not present\n");
 299                 return -EALREADY;
 300         }
 301         acpi_bus_trim(adev);
 302         return 0;
 303 }
 304
 305 static int acpi_scan_device_check(struct acpi_device *adev)
 306 {
 307         int error;
 308
 309         acpi_bus_get_status(adev);
 310         if (adev->status.present || adev->status.functional) {
 311                 /*
 312                  * This function is only called for device objects for which
 313                  * matching scan handlers exist.  The only situation in which
 314                  * the scan handler is not attached to this device object yet
 315                  * is when the device has just appeared (either it wasn't
 316                  * present at all before or it was removed and then added
 317                  * again).
 318                  */
 319                 if (adev->handler) {
 320                         dev_warn(&adev->dev, "Already enumerated\n");
 321                         return -EALREADY;
 322                 }
 323                 error = acpi_bus_scan(adev->handle);
 324                 if (error) {
 325                         dev_warn(&adev->dev, "Namespace scan failure\n");
 326                         return error;
 327                 }
 328                 if (!adev->handler) {
 329                         dev_warn(&adev->dev, "Enumeration failure\n");
 330                         error = -ENODEV;
 331                 }
 332         } else {
 333                 error = acpi_scan_device_not_present(adev);
 334         }
 335         return error;
 336 }
 337
 338 static int acpi_scan_bus_check(struct acpi_device *adev, void *not_used)
 339 {
 340         struct acpi_scan_handler *handler = adev->handler;
 341         int error;
 342
 343         acpi_bus_get_status(adev);
 344         if (!(adev->status.present || adev->status.functional)) {
 345                 acpi_scan_device_not_present(adev);
 346                 return 0;
 347         }
 348         if (handler && handler->hotplug.scan_dependent)
 349                 return handler->hotplug.scan_dependent(adev);
 350
 351         error = acpi_bus_scan(adev->handle);
 352         if (error) {
 353                 dev_warn(&adev->dev, "Namespace scan failure\n");
 354                 return error;
 355         }
 356         return acpi_dev_for_each_child(adev, acpi_scan_bus_check, NULL);
 357 }
 358
 359 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 360 {
 361         switch (type) {
 362         case ACPI_NOTIFY_BUS_CHECK:
 363                 return acpi_scan_bus_check(adev, NULL);
 364         case ACPI_NOTIFY_DEVICE_CHECK:
 365                 return acpi_scan_device_check(adev);
 366         case ACPI_NOTIFY_EJECT_REQUEST:
 367         case ACPI_OST_EC_OSPM_EJECT:
 368                 if (adev->handler && !adev->handler->hotplug.enabled) {
 369                         dev_info(&adev->dev, "Eject disabled\n");
 370                         return -EPERM;
 371                 }
 372                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 373                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 374                 return acpi_scan_hot_remove(adev);
 375         }
 376         return -EINVAL;
 377 }
 378
 379 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 380 {
 381         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 382         int error = -ENODEV;
 383
 384         lock_device_hotplug();
 385         mutex_lock(&acpi_scan_lock);
 386
 387         /*
 388          * The device object's ACPI handle cannot become invalid as long as we
 389          * are holding acpi_scan_lock, but it might have become invalid before
 390          * that lock was acquired.
 391          */
 392         if (adev->handle == INVALID_ACPI_HANDLE)
 393                 goto err_out;
 394
 395         if (adev->flags.is_dock_station) {
 396                 error = dock_notify(adev, src);
 397         } else if (adev->flags.hotplug_notify) {
 398                 error = acpi_generic_hotplug_event(adev, src);
 399         } else {
 400                 int (*notify)(struct acpi_device *, u32);
 401
 402                 acpi_lock_hp_context();
 403                 notify = adev->hp ? adev->hp->notify : NULL;
 404                 acpi_unlock_hp_context();
 405                 /*
 406                  * There may be additional notify handlers for device objects
 407                  * without the .event() callback, so ignore them here.
 408                  */
 409                 if (notify)
 410                         error = notify(adev, src);
 411                 else
 412                         goto out;
 413         }
 414         switch (error) {
 415         case 0:
 416                 ost_code = ACPI_OST_SC_SUCCESS;
 417                 break;
 418         case -EPERM:
 419                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 420                 break;
 421         case -EBUSY:
 422                 ost_code = ACPI_OST_SC_DEVICE_BUSY;
 423                 break;
 424         default:
 425                 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 426                 break;
 427         }
 428
 429  err_out:
 430         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 431
 432  out:
 433         acpi_bus_put_acpi_device(adev);
 434         mutex_unlock(&acpi_scan_lock);
 435         unlock_device_hotplug();
 436 }
 437
 438 static void acpi_free_power_resources_lists(struct acpi_device *device)
 439 {
 440         int i;
 441
 442         if (device->wakeup.flags.valid)
 443                 acpi_power_resources_list_free(&device->wakeup.resources);
 444
 445         if (!device->power.flags.power_resources)
 446                 return;
 447
 448         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 449                 struct acpi_device_power_state *ps = &device->power.states[i];
 450                 acpi_power_resources_list_free(&ps->resources);
 451         }
 452 }
 453
 454 static void acpi_device_release(struct device *dev)
 455 {
 456         struct acpi_device *acpi_dev = to_acpi_device(dev);
 457
 458         acpi_free_properties(acpi_dev);
 459         acpi_free_pnp_ids(&acpi_dev->pnp);
 460         acpi_free_power_resources_lists(acpi_dev);
 461         kfree(acpi_dev);
 462 }
 463
 464 static void acpi_device_del(struct acpi_device *device)
 465 {
 466         struct acpi_device_bus_id *acpi_device_bus_id;
 467
 468         mutex_lock(&acpi_device_lock);
 469
 470         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
 471                 if (!strcmp(acpi_device_bus_id->bus_id,
 472                             acpi_device_hid(device))) {
 473                         ida_free(&acpi_device_bus_id->instance_ida,
 474                                  device->pnp.instance_no);
 475                         if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
 476                                 list_del(&acpi_device_bus_id->node);
 477                                 kfree_const(acpi_device_bus_id->bus_id);
 478                                 kfree(acpi_device_bus_id);
 479                         }
 480                         break;
 481                 }
 482
 483         list_del(&device->wakeup_list);
 484
 485         mutex_unlock(&acpi_device_lock);
 486
 487         acpi_power_add_remove_device(device, false);
 488         acpi_device_remove_files(device);
 489         if (device->remove)
 490                 device->remove(device);
 491
 492         device_del(&device->dev);
 493 }
 494
 495 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
 496
 497 static LIST_HEAD(acpi_device_del_list);
 498 static DEFINE_MUTEX(acpi_device_del_lock);
 499
 500 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 501 {
 502         for (;;) {
 503                 struct acpi_device *adev;
 504
 505                 mutex_lock(&acpi_device_del_lock);
 506
 507                 if (list_empty(&acpi_device_del_list)) {
 508                         mutex_unlock(&acpi_device_del_lock);
 509                         break;
 510                 }
 511                 adev = list_first_entry(&acpi_device_del_list,
 512                                         struct acpi_device, del_list);
 513                 list_del(&adev->del_list);
 514
 515                 mutex_unlock(&acpi_device_del_lock);
 516
 517                 blocking_notifier_call_chain(&acpi_reconfig_chain,
 518                                              ACPI_RECONFIG_DEVICE_REMOVE, adev);
 519
 520                 acpi_device_del(adev);
 521                 /*
 522                  * Drop references to all power resources that might have been
 523                  * used by the device.
 524                  */
 525                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 526                 acpi_dev_put(adev);
 527         }
 528 }
 529
 530 /**
 531  * acpi_scan_drop_device - Drop an ACPI device object.
 532  * @handle: Handle of an ACPI namespace node, not used.
 533  * @context: Address of the ACPI device object to drop.
 534  *
 535  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 536  * namespace node the device object pointed to by @context is attached to.
 537  *
 538  * The unregistration is carried out asynchronously to avoid running
 539  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 540  * ensure the correct ordering (the device objects must be unregistered in the
 541  * same order in which the corresponding namespace nodes are deleted).
 542  */
 543 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 544 {
 545         static DECLARE_WORK(work, acpi_device_del_work_fn);
 546         struct acpi_device *adev = context;
 547
 548         mutex_lock(&acpi_device_del_lock);
 549
 550         /*
 551          * Use the ACPI hotplug workqueue which is ordered, so this work item
 552          * won't run after any hotplug work items submitted subsequently.  That
 553          * prevents attempts to register device objects identical to those being
 554          * deleted from happening concurrently (such attempts result from
 555          * hotplug events handled via the ACPI hotplug workqueue).  It also will
 556          * run after all of the work items submitted previously, which helps
 557          * those work items to ensure that they are not accessing stale device
 558          * objects.
 559          */
 560         if (list_empty(&acpi_device_del_list))
 561                 acpi_queue_hotplug_work(&work);
 562
 563         list_add_tail(&adev->del_list, &acpi_device_del_list);
 564         /* Make acpi_ns_validate_handle() return NULL for this handle. */
 565         adev->handle = INVALID_ACPI_HANDLE;
 566
 567         mutex_unlock(&acpi_device_del_lock);
 568 }
 569
 570 static struct acpi_device *handle_to_device(acpi_handle handle,
 571                                             void (*callback)(void *))
 572 {
 573         struct acpi_device *adev = NULL;
 574         acpi_status status;
 575
 576         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 577                                     (void **)&adev, callback);
 578         if (ACPI_FAILURE(status) || !adev) {
 579                 acpi_handle_debug(handle, "No context!\n");
 580                 return NULL;
 581         }
 582         return adev;
 583 }
 584
 585 /**
 586  * acpi_fetch_acpi_dev - Retrieve ACPI device object.
 587  * @handle: ACPI handle associated with the requested ACPI device object.
 588  *
 589  * Return a pointer to the ACPI device object associated with @handle, if
 590  * present, or NULL otherwise.
 591  */
 592 struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)
 593 {
 594         return handle_to_device(handle, NULL);
 595 }
 596 EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);
 597
 598 static void get_acpi_device(void *dev)
 599 {
 600         acpi_dev_get(dev);
 601 }
 602
 603 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 604 {
 605         return handle_to_device(handle, get_acpi_device);
 606 }
 607 EXPORT_SYMBOL_GPL(acpi_bus_get_acpi_device);
 608
 609 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
 610 {
 611         struct acpi_device_bus_id *acpi_device_bus_id;
 612
 613         /* Find suitable bus_id and instance number in acpi_bus_id_list. */
 614         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 615                 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
 616                         return acpi_device_bus_id;
 617         }
 618         return NULL;
 619 }
 620
 621 static int acpi_device_set_name(struct acpi_device *device,
 622                                 struct acpi_device_bus_id *acpi_device_bus_id)
 623 {
 624         struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
 625         int result;
 626
 627         result = ida_alloc(instance_ida, GFP_KERNEL);
 628         if (result < 0)
 629                 return result;
 630
 631         device->pnp.instance_no = result;
 632         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
 633         return 0;
 634 }
 635
 636 static int acpi_tie_acpi_dev(struct acpi_device *adev)
 637 {
 638         acpi_handle handle = adev->handle;
 639         acpi_status status;
 640
 641         if (!handle)
 642                 return 0;
 643
 644         status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
 645         if (ACPI_FAILURE(status)) {
 646                 acpi_handle_err(handle, "Unable to attach device data\n");
 647                 return -ENODEV;
 648         }
 649
 650         return 0;
 651 }
 652
 653 static void acpi_store_pld_crc(struct acpi_device *adev)
 654 {
 655         struct acpi_pld_info *pld;
 656         acpi_status status;
 657
 658         status = acpi_get_physical_device_location(adev->handle, &pld);
 659         if (ACPI_FAILURE(status))
 660                 return;
 661
 662         adev->pld_crc = crc32(~0, pld, sizeof(*pld));
 663         ACPI_FREE(pld);
 664 }
 665
 666 static int __acpi_device_add(struct acpi_device *device,
 667                              void (*release)(struct device *))
 668 {
 669         struct acpi_device_bus_id *acpi_device_bus_id;
 670         int result;
 671
 672         /*
 673          * Linkage
 674          * -------
 675          * Link this device to its parent and siblings.
 676          */
 677         INIT_LIST_HEAD(&device->wakeup_list);
 678         INIT_LIST_HEAD(&device->physical_node_list);
 679         INIT_LIST_HEAD(&device->del_list);
 680         mutex_init(&device->physical_node_lock);
 681
 682         mutex_lock(&acpi_device_lock);
 683
 684         acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
 685         if (acpi_device_bus_id) {
 686                 result = acpi_device_set_name(device, acpi_device_bus_id);
 687                 if (result)
 688                         goto err_unlock;
 689         } else {
 690                 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
 691                                              GFP_KERNEL);
 692                 if (!acpi_device_bus_id) {
 693                         result = -ENOMEM;
 694                         goto err_unlock;
 695                 }
 696                 acpi_device_bus_id->bus_id =
 697                         kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
 698                 if (!acpi_device_bus_id->bus_id) {
 699                         kfree(acpi_device_bus_id);
 700                         result = -ENOMEM;
 701                         goto err_unlock;
 702                 }
 703
 704                 ida_init(&acpi_device_bus_id->instance_ida);
 705
 706                 result = acpi_device_set_name(device, acpi_device_bus_id);
 707                 if (result) {
 708                         kfree_const(acpi_device_bus_id->bus_id);
 709                         kfree(acpi_device_bus_id);
 710                         goto err_unlock;
 711                 }
 712
 713                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 714         }
 715
 716         if (device->wakeup.flags.valid)
 717                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 718
 719         acpi_store_pld_crc(device);
 720
 721         mutex_unlock(&acpi_device_lock);
 722
 723         if (device->parent)
 724                 device->dev.parent = &device->parent->dev;
 725
 726         device->dev.bus = &acpi_bus_type;
 727         device->dev.release = release;
 728         result = device_add(&device->dev);
 729         if (result) {
 730                 dev_err(&device->dev, "Error registering device\n");
 731                 goto err;
 732         }
 733
 734         result = acpi_device_setup_files(device);
 735         if (result)
 736                 pr_err("Error creating sysfs interface for device %s\n",
 737                        dev_name(&device->dev));
 738
 739         return 0;
 740
 741 err:
 742         mutex_lock(&acpi_device_lock);
 743
 744         list_del(&device->wakeup_list);
 745
 746 err_unlock:
 747         mutex_unlock(&acpi_device_lock);
 748
 749         acpi_detach_data(device->handle, acpi_scan_drop_device);
 750
 751         return result;
 752 }
 753
 754 int acpi_device_add(struct acpi_device *adev, void (*release)(struct device *))
 755 {
 756         int ret;
 757
 758         ret = acpi_tie_acpi_dev(adev);
 759         if (ret)
 760                 return ret;
 761
 762         return __acpi_device_add(adev, release);
 763 }
 764
 765 /* --------------------------------------------------------------------------
 766                                  Device Enumeration
 767    -------------------------------------------------------------------------- */
 768 static bool acpi_info_matches_ids(struct acpi_device_info *info,
 769                                   const char * const ids[])
 770 {
 771         struct acpi_pnp_device_id_list *cid_list = NULL;
 772         int i, index;
 773
 774         if (!(info->valid & ACPI_VALID_HID))
 775                 return false;
 776
 777         index = match_string(ids, -1, info->hardware_id.string);
 778         if (index >= 0)
 779                 return true;
 780
 781         if (info->valid & ACPI_VALID_CID)
 782                 cid_list = &info->compatible_id_list;
 783
 784         if (!cid_list)
 785                 return false;
 786
 787         for (i = 0; i < cid_list->count; i++) {
 788                 index = match_string(ids, -1, cid_list->ids[i].string);
 789                 if (index >= 0)
 790                         return true;
 791         }
 792
 793         return false;
 794 }
 795
 796 /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
 797 static const char * const acpi_ignore_dep_ids[] = {
 798         "PNP0D80", /* Windows-compatible System Power Management Controller */
 799         "INT33BD", /* Intel Baytrail Mailbox Device */
 800         NULL
 801 };
 802
 803 /* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */
 804 static const char * const acpi_honor_dep_ids[] = {
 805         "INT3472", /* Camera sensor PMIC / clk and regulator info */
 806         NULL
 807 };
 808
 809 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 810 {
 811         struct acpi_device *device;
 812         acpi_status status;
 813
 814         /*
 815          * Fixed hardware devices do not appear in the namespace and do not
 816          * have handles, but we fabricate acpi_devices for them, so we have
 817          * to deal with them specially.
 818          */
 819         if (!handle)
 820                 return acpi_root;
 821
 822         do {
 823                 status = acpi_get_parent(handle, &handle);
 824                 if (ACPI_FAILURE(status))
 825                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 826
 827                 device = acpi_fetch_acpi_dev(handle);
 828         } while (!device);
 829         return device;
 830 }
 831
 832 acpi_status
 833 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 834 {
 835         acpi_status status;
 836         acpi_handle tmp;
 837         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 838         union acpi_object *obj;
 839
 840         status = acpi_get_handle(handle, "_EJD", &tmp);
 841         if (ACPI_FAILURE(status))
 842                 return status;
 843
 844         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 845         if (ACPI_SUCCESS(status)) {
 846                 obj = buffer.pointer;
 847                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 848                                          ejd);
 849                 kfree(buffer.pointer);
 850         }
 851         return status;
 852 }
 853 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 854
 855 static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
 856 {
 857         acpi_handle handle = dev->handle;
 858         struct acpi_device_wakeup *wakeup = &dev->wakeup;
 859         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 860         union acpi_object *package = NULL;
 861         union acpi_object *element = NULL;
 862         acpi_status status;
 863         int err = -ENODATA;
 864
 865         INIT_LIST_HEAD(&wakeup->resources);
 866
 867         /* _PRW */
 868         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 869         if (ACPI_FAILURE(status)) {
 870                 acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
 871                                  acpi_format_exception(status));
 872                 return err;
 873         }
 874
 875         package = (union acpi_object *)buffer.pointer;
 876
 877         if (!package || package->package.count < 2)
 878                 goto out;
 879
 880         element = &(package->package.elements[0]);
 881         if (!element)
 882                 goto out;
 883
 884         if (element->type == ACPI_TYPE_PACKAGE) {
 885                 if ((element->package.count < 2) ||
 886                     (element->package.elements[0].type !=
 887                      ACPI_TYPE_LOCAL_REFERENCE)
 888                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 889                         goto out;
 890
 891                 wakeup->gpe_device =
 892                     element->package.elements[0].reference.handle;
 893                 wakeup->gpe_number =
 894                     (u32) element->package.elements[1].integer.value;
 895         } else if (element->type == ACPI_TYPE_INTEGER) {
 896                 wakeup->gpe_device = NULL;
 897                 wakeup->gpe_number = element->integer.value;
 898         } else {
 899                 goto out;
 900         }
 901
 902         element = &(package->package.elements[1]);
 903         if (element->type != ACPI_TYPE_INTEGER)
 904                 goto out;
 905
 906         wakeup->sleep_state = element->integer.value;
 907
 908         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 909         if (err)
 910                 goto out;
 911
 912         if (!list_empty(&wakeup->resources)) {
 913                 int sleep_state;
 914
 915                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 916                                                   &sleep_state);
 917                 if (err) {
 918                         acpi_handle_warn(handle, "Retrieving current states "
 919                                          "of wakeup power resources failed\n");
 920                         acpi_power_resources_list_free(&wakeup->resources);
 921                         goto out;
 922                 }
 923                 if (sleep_state < wakeup->sleep_state) {
 924                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 925                                          "(S%d) by S%d from power resources\n",
 926                                          (int)wakeup->sleep_state, sleep_state);
 927                         wakeup->sleep_state = sleep_state;
 928                 }
 929         }
 930
 931  out:
 932         kfree(buffer.pointer);
 933         return err;
 934 }
 935
 936 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
 937 {
 938         static const struct acpi_device_id button_device_ids[] = {
 939                 {"PNP0C0C", 0},         /* Power button */
 940                 {"PNP0C0D", 0},         /* Lid */
 941                 {"PNP0C0E", 0},         /* Sleep button */
 942                 {"", 0},
 943         };
 944         struct acpi_device_wakeup *wakeup = &device->wakeup;
 945         acpi_status status;
 946
 947         wakeup->flags.notifier_present = 0;
 948
 949         /* Power button, Lid switch always enable wakeup */
 950         if (!acpi_match_device_ids(device, button_device_ids)) {
 951                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 952                         /* Do not use Lid/sleep button for S5 wakeup */
 953                         if (wakeup->sleep_state == ACPI_STATE_S5)
 954                                 wakeup->sleep_state = ACPI_STATE_S4;
 955                 }
 956                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 957                 device_set_wakeup_capable(&device->dev, true);
 958                 return true;
 959         }
 960
 961         status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 962                                          wakeup->gpe_number);
 963         return ACPI_SUCCESS(status);
 964 }
 965
 966 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 967 {
 968         int err;
 969
 970         /* Presence of _PRW indicates wake capable */
 971         if (!acpi_has_method(device->handle, "_PRW"))
 972                 return;
 973
 974         err = acpi_bus_extract_wakeup_device_power_package(device);
 975         if (err) {
 976                 dev_err(&device->dev, "Unable to extract wakeup power resources");
 977                 return;
 978         }
 979
 980         device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
 981         device->wakeup.prepare_count = 0;
 982         /*
 983          * Call _PSW/_DSW object to disable its ability to wake the sleeping
 984          * system for the ACPI device with the _PRW object.
 985          * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
 986          * So it is necessary to call _DSW object first. Only when it is not
 987          * present will the _PSW object used.
 988          */
 989         err = acpi_device_sleep_wake(device, 0, 0, 0);
 990         if (err)
 991                 pr_debug("error in _DSW or _PSW evaluation\n");
 992 }
 993
 994 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 995 {
 996         struct acpi_device_power_state *ps = &device->power.states[state];
 997         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 998         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 999         acpi_status status;
1000
1001         INIT_LIST_HEAD(&ps->resources);
1002
1003         /* Evaluate "_PRx" to get referenced power resources */
1004         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1005         if (ACPI_SUCCESS(status)) {
1006                 union acpi_object *package = buffer.pointer;
1007
1008                 if (buffer.length && package
1009                     && package->type == ACPI_TYPE_PACKAGE
1010                     && package->package.count)
1011                         acpi_extract_power_resources(package, 0, &ps->resources);
1012
1013                 ACPI_FREE(buffer.pointer);
1014         }
1015
1016         /* Evaluate "_PSx" to see if we can do explicit sets */
1017         pathname[2] = 'S';
1018         if (acpi_has_method(device->handle, pathname))
1019                 ps->flags.explicit_set = 1;
1020
1021         /* State is valid if there are means to put the device into it. */
1022         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
1023                 ps->flags.valid = 1;
1024
1025         ps->power = -1;         /* Unknown - driver assigned */
1026         ps->latency = -1;       /* Unknown - driver assigned */
1027 }
1028
1029 static void acpi_bus_get_power_flags(struct acpi_device *device)
1030 {
1031         unsigned long long dsc = ACPI_STATE_D0;
1032         u32 i;
1033
1034         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1035         if (!acpi_has_method(device->handle, "_PS0") &&
1036             !acpi_has_method(device->handle, "_PR0"))
1037                 return;
1038
1039         device->flags.power_manageable = 1;
1040
1041         /*
1042          * Power Management Flags
1043          */
1044         if (acpi_has_method(device->handle, "_PSC"))
1045                 device->power.flags.explicit_get = 1;
1046
1047         if (acpi_has_method(device->handle, "_IRC"))
1048                 device->power.flags.inrush_current = 1;
1049
1050         if (acpi_has_method(device->handle, "_DSW"))
1051                 device->power.flags.dsw_present = 1;
1052
1053         acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc);
1054         device->power.state_for_enumeration = dsc;
1055
1056         /*
1057          * Enumerate supported power management states
1058          */
1059         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1060                 acpi_bus_init_power_state(device, i);
1061
1062         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1063
1064         /* Set the defaults for D0 and D3hot (always supported). */
1065         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1066         device->power.states[ACPI_STATE_D0].power = 100;
1067         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1068
1069         /*
1070          * Use power resources only if the D0 list of them is populated, because
1071          * some platforms may provide _PR3 only to indicate D3cold support and
1072          * in those cases the power resources list returned by it may be bogus.
1073          */
1074         if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1075                 device->power.flags.power_resources = 1;
1076                 /*
1077                  * D3cold is supported if the D3hot list of power resources is
1078                  * not empty.
1079                  */
1080                 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1081                         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1082         }
1083
1084         if (acpi_bus_init_power(device))
1085                 device->flags.power_manageable = 0;
1086 }
1087
1088 static void acpi_bus_get_flags(struct acpi_device *device)
1089 {
1090         /* Presence of _STA indicates 'dynamic_status' */
1091         if (acpi_has_method(device->handle, "_STA"))
1092                 device->flags.dynamic_status = 1;
1093
1094         /* Presence of _RMV indicates 'removable' */
1095         if (acpi_has_method(device->handle, "_RMV"))
1096                 device->flags.removable = 1;
1097
1098         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1099         if (acpi_has_method(device->handle, "_EJD") ||
1100             acpi_has_method(device->handle, "_EJ0"))
1101                 device->flags.ejectable = 1;
1102 }
1103
1104 static void acpi_device_get_busid(struct acpi_device *device)
1105 {
1106         char bus_id[5] = { '?', 0 };
1107         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1108         int i = 0;
1109
1110         /*
1111          * Bus ID
1112          * ------
1113          * The device's Bus ID is simply the object name.
1114          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1115          */
1116         if (ACPI_IS_ROOT_DEVICE(device)) {
1117                 strcpy(device->pnp.bus_id, "ACPI");
1118                 return;
1119         }
1120
1121         switch (device->device_type) {
1122         case ACPI_BUS_TYPE_POWER_BUTTON:
1123                 strcpy(device->pnp.bus_id, "PWRF");
1124                 break;
1125         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1126                 strcpy(device->pnp.bus_id, "SLPF");
1127                 break;
1128         case ACPI_BUS_TYPE_ECDT_EC:
1129                 strcpy(device->pnp.bus_id, "ECDT");
1130                 break;
1131         default:
1132                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1133                 /* Clean up trailing underscores (if any) */
1134                 for (i = 3; i > 1; i--) {
1135                         if (bus_id[i] == '_')
1136                                 bus_id[i] = '\0';
1137                         else
1138                                 break;
1139                 }
1140                 strcpy(device->pnp.bus_id, bus_id);
1141                 break;
1142         }
1143 }
1144
1145 /*
1146  * acpi_ata_match - see if an acpi object is an ATA device
1147  *
1148  * If an acpi object has one of the ACPI ATA methods defined,
1149  * then we can safely call it an ATA device.
1150  */
1151 bool acpi_ata_match(acpi_handle handle)
1152 {
1153         return acpi_has_method(handle, "_GTF") ||
1154                acpi_has_method(handle, "_GTM") ||
1155                acpi_has_method(handle, "_STM") ||
1156                acpi_has_method(handle, "_SDD");
1157 }
1158
1159 /*
1160  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1161  *
1162  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1163  * then we can safely call it an ejectable drive bay
1164  */
1165 bool acpi_bay_match(acpi_handle handle)
1166 {
1167         acpi_handle phandle;
1168
1169         if (!acpi_has_method(handle, "_EJ0"))
1170                 return false;
1171         if (acpi_ata_match(handle))
1172                 return true;
1173         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1174                 return false;
1175
1176         return acpi_ata_match(phandle);
1177 }
1178
1179 bool acpi_device_is_battery(struct acpi_device *adev)
1180 {
1181         struct acpi_hardware_id *hwid;
1182
1183         list_for_each_entry(hwid, &adev->pnp.ids, list)
1184                 if (!strcmp("PNP0C0A", hwid->id))
1185                         return true;
1186
1187         return false;
1188 }
1189
1190 static bool is_ejectable_bay(struct acpi_device *adev)
1191 {
1192         acpi_handle handle = adev->handle;
1193
1194         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1195                 return true;
1196
1197         return acpi_bay_match(handle);
1198 }
1199
1200 /*
1201  * acpi_dock_match - see if an acpi object has a _DCK method
1202  */
1203 bool acpi_dock_match(acpi_handle handle)
1204 {
1205         return acpi_has_method(handle, "_DCK");
1206 }
1207
1208 static acpi_status
1209 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1210                           void **return_value)
1211 {
1212         long *cap = context;
1213
1214         if (acpi_has_method(handle, "_BCM") &&
1215             acpi_has_method(handle, "_BCL")) {
1216                 acpi_handle_debug(handle, "Found generic backlight support\n");
1217                 *cap |= ACPI_VIDEO_BACKLIGHT;
1218                 /* We have backlight support, no need to scan further */
1219                 return AE_CTRL_TERMINATE;
1220         }
1221         return 0;
1222 }
1223
1224 /* Returns true if the ACPI object is a video device which can be
1225  * handled by video.ko.
1226  * The device will get a Linux specific CID added in scan.c to
1227  * identify the device as an ACPI graphics device
1228  * Be aware that the graphics device may not be physically present
1229  * Use acpi_video_get_capabilities() to detect general ACPI video
1230  * capabilities of present cards
1231  */
1232 long acpi_is_video_device(acpi_handle handle)
1233 {
1234         long video_caps = 0;
1235
1236         /* Is this device able to support video switching ? */
1237         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1238                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1239
1240         /* Is this device able to retrieve a video ROM ? */
1241         if (acpi_has_method(handle, "_ROM"))
1242                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1243
1244         /* Is this device able to configure which video head to be POSTed ? */
1245         if (acpi_has_method(handle, "_VPO") &&
1246             acpi_has_method(handle, "_GPD") &&
1247             acpi_has_method(handle, "_SPD"))
1248                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1249
1250         /* Only check for backlight functionality if one of the above hit. */
1251         if (video_caps)
1252                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1253                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1254                                     &video_caps, NULL);
1255
1256         return video_caps;
1257 }
1258 EXPORT_SYMBOL(acpi_is_video_device);
1259
1260 const char *acpi_device_hid(struct acpi_device *device)
1261 {
1262         struct acpi_hardware_id *hid;
1263
1264         if (list_empty(&device->pnp.ids))
1265                 return dummy_hid;
1266
1267         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1268         return hid->id;
1269 }
1270 EXPORT_SYMBOL(acpi_device_hid);
1271
1272 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1273 {
1274         struct acpi_hardware_id *id;
1275
1276         id = kmalloc(sizeof(*id), GFP_KERNEL);
1277         if (!id)
1278                 return;
1279
1280         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1281         if (!id->id) {
1282                 kfree(id);
1283                 return;
1284         }
1285
1286         list_add_tail(&id->list, &pnp->ids);
1287         pnp->type.hardware_id = 1;
1288 }
1289
1290 /*
1291  * Old IBM workstations have a DSDT bug wherein the SMBus object
1292  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1293  * prefix.  Work around this.
1294  */
1295 static bool acpi_ibm_smbus_match(acpi_handle handle)
1296 {
1297         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1298         struct acpi_buffer path = { sizeof(node_name), node_name };
1299
1300         if (!dmi_name_in_vendors("IBM"))
1301                 return false;
1302
1303         /* Look for SMBS object */
1304         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1305             strcmp("SMBS", path.pointer))
1306                 return false;
1307
1308         /* Does it have the necessary (but misnamed) methods? */
1309         if (acpi_has_method(handle, "SBI") &&
1310             acpi_has_method(handle, "SBR") &&
1311             acpi_has_method(handle, "SBW"))
1312                 return true;
1313
1314         return false;
1315 }
1316
1317 static bool acpi_object_is_system_bus(acpi_handle handle)
1318 {
1319         acpi_handle tmp;
1320
1321         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1322             tmp == handle)
1323                 return true;
1324         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1325             tmp == handle)
1326                 return true;
1327
1328         return false;
1329 }
1330
1331 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1332                              int device_type)
1333 {
1334         struct acpi_device_info *info = NULL;
1335         struct acpi_pnp_device_id_list *cid_list;
1336         int i;
1337
1338         switch (device_type) {
1339         case ACPI_BUS_TYPE_DEVICE:
1340                 if (handle == ACPI_ROOT_OBJECT) {
1341                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1342                         break;
1343                 }
1344
1345                 acpi_get_object_info(handle, &info);
1346                 if (!info) {
1347                         pr_err("%s: Error reading device info\n", __func__);
1348                         return;
1349                 }
1350
1351                 if (info->valid & ACPI_VALID_HID) {
1352                         acpi_add_id(pnp, info->hardware_id.string);
1353                         pnp->type.platform_id = 1;
1354                 }
1355                 if (info->valid & ACPI_VALID_CID) {
1356                         cid_list = &info->compatible_id_list;
1357                         for (i = 0; i < cid_list->count; i++)
1358                                 acpi_add_id(pnp, cid_list->ids[i].string);
1359                 }
1360                 if (info->valid & ACPI_VALID_ADR) {
1361                         pnp->bus_address = info->address;
1362                         pnp->type.bus_address = 1;
1363                 }
1364                 if (info->valid & ACPI_VALID_UID)
1365                         pnp->unique_id = kstrdup(info->unique_id.string,
1366                                                         GFP_KERNEL);
1367                 if (info->valid & ACPI_VALID_CLS)
1368                         acpi_add_id(pnp, info->class_code.string);
1369
1370                 kfree(info);
1371
1372                 /*
1373                  * Some devices don't reliably have _HIDs & _CIDs, so add
1374                  * synthetic HIDs to make sure drivers can find them.
1375                  */
1376                 if (acpi_is_video_device(handle))
1377                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1378                 else if (acpi_bay_match(handle))
1379                         acpi_add_id(pnp, ACPI_BAY_HID);
1380                 else if (acpi_dock_match(handle))
1381                         acpi_add_id(pnp, ACPI_DOCK_HID);
1382                 else if (acpi_ibm_smbus_match(handle))
1383                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1384                 else if (list_empty(&pnp->ids) &&
1385                          acpi_object_is_system_bus(handle)) {
1386                         /* \_SB, \_TZ, LNXSYBUS */
1387                         acpi_add_id(pnp, ACPI_BUS_HID);
1388                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1389                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1390                 }
1391
1392                 break;
1393         case ACPI_BUS_TYPE_POWER:
1394                 acpi_add_id(pnp, ACPI_POWER_HID);
1395                 break;
1396         case ACPI_BUS_TYPE_PROCESSOR:
1397                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1398                 break;
1399         case ACPI_BUS_TYPE_THERMAL:
1400                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1401                 break;
1402         case ACPI_BUS_TYPE_POWER_BUTTON:
1403                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1404                 break;
1405         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1406                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1407                 break;
1408         case ACPI_BUS_TYPE_ECDT_EC:
1409                 acpi_add_id(pnp, ACPI_ECDT_HID);
1410                 break;
1411         }
1412 }
1413
1414 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1415 {
1416         struct acpi_hardware_id *id, *tmp;
1417
1418         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1419                 kfree_const(id->id);
1420                 kfree(id);
1421         }
1422         kfree(pnp->unique_id);
1423 }
1424
1425 /**
1426  * acpi_dma_supported - Check DMA support for the specified device.
1427  * @adev: The pointer to acpi device
1428  *
1429  * Return false if DMA is not supported. Otherwise, return true
1430  */
1431 bool acpi_dma_supported(const struct acpi_device *adev)
1432 {
1433         if (!adev)
1434                 return false;
1435
1436         if (adev->flags.cca_seen)
1437                 return true;
1438
1439         /*
1440         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1441         * DMA on "Intel platforms".  Presumably that includes all x86 and
1442         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1443         */
1444         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1445                 return true;
1446
1447         return false;
1448 }
1449
1450 /**
1451  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1452  * @adev: The pointer to acpi device
1453  *
1454  * Return enum dev_dma_attr.
1455  */
1456 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1457 {
1458         if (!acpi_dma_supported(adev))
1459                 return DEV_DMA_NOT_SUPPORTED;
1460
1461         if (adev->flags.coherent_dma)
1462                 return DEV_DMA_COHERENT;
1463         else
1464                 return DEV_DMA_NON_COHERENT;
1465 }
1466
1467 /**
1468  * acpi_dma_get_range() - Get device DMA parameters.
1469  *
1470  * @dev: device to configure
1471  * @map: pointer to DMA ranges result
1472  *
1473  * Evaluate DMA regions and return pointer to DMA regions on
1474  * parsing success; it does not update the passed in values on failure.
1475  *
1476  * Return 0 on success, < 0 on failure.
1477  */
1478 int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map)
1479 {
1480         struct acpi_device *adev;
1481         LIST_HEAD(list);
1482         struct resource_entry *rentry;
1483         int ret;
1484         struct device *dma_dev = dev;
1485         struct bus_dma_region *r;
1486
1487         /*
1488          * Walk the device tree chasing an ACPI companion with a _DMA
1489          * object while we go. Stop if we find a device with an ACPI
1490          * companion containing a _DMA method.
1491          */
1492         do {
1493                 adev = ACPI_COMPANION(dma_dev);
1494                 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1495                         break;
1496
1497                 dma_dev = dma_dev->parent;
1498         } while (dma_dev);
1499
1500         if (!dma_dev)
1501                 return -ENODEV;
1502
1503         if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1504                 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1505                 return -EINVAL;
1506         }
1507
1508         ret = acpi_dev_get_dma_resources(adev, &list);
1509         if (ret > 0) {
1510                 r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL);
1511                 if (!r) {
1512                         ret = -ENOMEM;
1513                         goto out;
1514                 }
1515
1516                 list_for_each_entry(rentry, &list, node) {
1517                         if (rentry->res->start >= rentry->res->end) {
1518                                 kfree(r);
1519                                 ret = -EINVAL;
1520                                 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1521                                 goto out;
1522                         }
1523
1524                         r->cpu_start = rentry->res->start;
1525                         r->dma_start = rentry->res->start - rentry->offset;
1526                         r->size = resource_size(rentry->res);
1527                         r->offset = rentry->offset;
1528                         r++;
1529                 }
1530
1531                 *map = r;
1532         }
1533  out:
1534         acpi_dev_free_resource_list(&list);
1535
1536         return ret >= 0 ? 0 : ret;
1537 }
1538
1539 #ifdef CONFIG_IOMMU_API
1540 int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1541                            struct fwnode_handle *fwnode,
1542                            const struct iommu_ops *ops)
1543 {
1544         int ret = iommu_fwspec_init(dev, fwnode, ops);
1545
1546         if (!ret)
1547                 ret = iommu_fwspec_add_ids(dev, &id, 1);
1548
1549         return ret;
1550 }
1551
1552 static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
1553 {
1554         struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1555
1556         return fwspec ? fwspec->ops : NULL;
1557 }
1558
1559 static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
1560                                                        const u32 *id_in)
1561 {
1562         int err;
1563         const struct iommu_ops *ops;
1564
1565         /*
1566          * If we already translated the fwspec there is nothing left to do,
1567          * return the iommu_ops.
1568          */
1569         ops = acpi_iommu_fwspec_ops(dev);
1570         if (ops)
1571                 return ops;
1572
1573         err = iort_iommu_configure_id(dev, id_in);
1574         if (err && err != -EPROBE_DEFER)
1575                 err = viot_iommu_configure(dev);
1576
1577         /*
1578          * If we have reason to believe the IOMMU driver missed the initial
1579          * iommu_probe_device() call for dev, replay it to get things in order.
1580          */
1581         if (!err && dev->bus && !device_iommu_mapped(dev))
1582                 err = iommu_probe_device(dev);
1583
1584         /* Ignore all other errors apart from EPROBE_DEFER */
1585         if (err == -EPROBE_DEFER) {
1586                 return ERR_PTR(err);
1587         } else if (err) {
1588                 dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
1589                 return NULL;
1590         }
1591         return acpi_iommu_fwspec_ops(dev);
1592 }
1593
1594 #else /* !CONFIG_IOMMU_API */
1595
1596 int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1597                            struct fwnode_handle *fwnode,
1598                            const struct iommu_ops *ops)
1599 {
1600         return -ENODEV;
1601 }
1602
1603 static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
1604                                                        const u32 *id_in)
1605 {
1606         return NULL;
1607 }
1608
1609 #endif /* !CONFIG_IOMMU_API */
1610
1611 /**
1612  * acpi_dma_configure_id - Set-up DMA configuration for the device.
1613  * @dev: The pointer to the device
1614  * @attr: device dma attributes
1615  * @input_id: input device id const value pointer
1616  */
1617 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1618                           const u32 *input_id)
1619 {
1620         const struct iommu_ops *iommu;
1621
1622         if (attr == DEV_DMA_NOT_SUPPORTED) {
1623                 set_dma_ops(dev, &dma_dummy_ops);
1624                 return 0;
1625         }
1626
1627         acpi_arch_dma_setup(dev);
1628
1629         iommu = acpi_iommu_configure_id(dev, input_id);
1630         if (PTR_ERR(iommu) == -EPROBE_DEFER)
1631                 return -EPROBE_DEFER;
1632
1633         arch_setup_dma_ops(dev, 0, U64_MAX,
1634                                 iommu, attr == DEV_DMA_COHERENT);
1635
1636         return 0;
1637 }
1638 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1639
1640 static void acpi_init_coherency(struct acpi_device *adev)
1641 {
1642         unsigned long long cca = 0;
1643         acpi_status status;
1644         struct acpi_device *parent = adev->parent;
1645
1646         if (parent && parent->flags.cca_seen) {
1647                 /*
1648                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1649                  * already saw one.
1650                  */
1651                 adev->flags.cca_seen = 1;
1652                 cca = parent->flags.coherent_dma;
1653         } else {
1654                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1655                                                NULL, &cca);
1656                 if (ACPI_SUCCESS(status))
1657                         adev->flags.cca_seen = 1;
1658                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1659                         /*
1660                          * If architecture does not specify that _CCA is
1661                          * required for DMA-able devices (e.g. x86),
1662                          * we default to _CCA=1.
1663                          */
1664                         cca = 1;
1665                 else
1666                         acpi_handle_debug(adev->handle,
1667                                           "ACPI device is missing _CCA.\n");
1668         }
1669
1670         adev->flags.coherent_dma = cca;
1671 }
1672
1673 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1674 {
1675         bool *is_serial_bus_slave_p = data;
1676
1677         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1678                 return 1;
1679
1680         *is_serial_bus_slave_p = true;
1681
1682          /* no need to do more checking */
1683         return -1;
1684 }
1685
1686 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1687 {
1688         struct acpi_device *parent = device->parent;
1689         static const struct acpi_device_id indirect_io_hosts[] = {
1690                 {"HISI0191", 0},
1691                 {}
1692         };
1693
1694         return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1695 }
1696
1697 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1698 {
1699         struct list_head resource_list;
1700         bool is_serial_bus_slave = false;
1701         static const struct acpi_device_id ignore_serial_bus_ids[] = {
1702         /*
1703          * These devices have multiple SerialBus resources and a client
1704          * device must be instantiated for each of them, each with
1705          * its own device id.
1706          * Normally we only instantiate one client device for the first
1707          * resource, using the ACPI HID as id. These special cases are handled
1708          * by the drivers/platform/x86/serial-multi-instantiate.c driver, which
1709          * knows which client device id to use for each resource.
1710          */
1711                 {"BSG1160", },
1712                 {"BSG2150", },
1713                 {"CSC3551", },
1714                 {"INT33FE", },
1715                 {"INT3515", },
1716                 /* Non-conforming _HID for Cirrus Logic already released */
1717                 {"CLSA0100", },
1718                 {"CLSA0101", },
1719         /*
1720          * Some ACPI devs contain SerialBus resources even though they are not
1721          * attached to a serial bus at all.
1722          */
1723                 {"MSHW0028", },
1724         /*
1725          * HIDs of device with an UartSerialBusV2 resource for which userspace
1726          * expects a regular tty cdev to be created (instead of the in kernel
1727          * serdev) and which have a kernel driver which expects a platform_dev
1728          * such as the rfkill-gpio driver.
1729          */
1730                 {"BCM4752", },
1731                 {"LNV4752", },
1732                 {}
1733         };
1734
1735         if (acpi_is_indirect_io_slave(device))
1736                 return true;
1737
1738         /* Macs use device properties in lieu of _CRS resources */
1739         if (x86_apple_machine &&
1740             (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1741              fwnode_property_present(&device->fwnode, "i2cAddress") ||
1742              fwnode_property_present(&device->fwnode, "baud")))
1743                 return true;
1744
1745         if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
1746                 return false;
1747
1748         INIT_LIST_HEAD(&resource_list);
1749         acpi_dev_get_resources(device, &resource_list,
1750                                acpi_check_serial_bus_slave,
1751                                &is_serial_bus_slave);
1752         acpi_dev_free_resource_list(&resource_list);
1753
1754         return is_serial_bus_slave;
1755 }
1756
1757 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1758                              int type)
1759 {
1760         INIT_LIST_HEAD(&device->pnp.ids);
1761         device->device_type = type;
1762         device->handle = handle;
1763         device->parent = acpi_bus_get_parent(handle);
1764         fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1765         acpi_set_device_status(device, ACPI_STA_DEFAULT);
1766         acpi_device_get_busid(device);
1767         acpi_set_pnp_ids(handle, &device->pnp, type);
1768         acpi_init_properties(device);
1769         acpi_bus_get_flags(device);
1770         device->flags.match_driver = false;
1771         device->flags.initialized = true;
1772         device->flags.enumeration_by_parent =
1773                 acpi_device_enumeration_by_parent(device);
1774         acpi_device_clear_enumerated(device);
1775         device_initialize(&device->dev);
1776         dev_set_uevent_suppress(&device->dev, true);
1777         acpi_init_coherency(device);
1778 }
1779
1780 static void acpi_scan_dep_init(struct acpi_device *adev)
1781 {
1782         struct acpi_dep_data *dep;
1783
1784         list_for_each_entry(dep, &acpi_dep_list, node) {
1785                 if (dep->consumer == adev->handle) {
1786                         if (dep->honor_dep)
1787                                 adev->flags.honor_deps = 1;
1788
1789                         adev->dep_unmet++;
1790                 }
1791         }
1792 }
1793
1794 void acpi_device_add_finalize(struct acpi_device *device)
1795 {
1796         dev_set_uevent_suppress(&device->dev, false);
1797         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1798 }
1799
1800 static void acpi_scan_init_status(struct acpi_device *adev)
1801 {
1802         if (acpi_bus_get_status(adev))
1803                 acpi_set_device_status(adev, 0);
1804 }
1805
1806 static int acpi_add_single_object(struct acpi_device **child,
1807                                   acpi_handle handle, int type, bool dep_init)
1808 {
1809         struct acpi_device *device;
1810         bool release_dep_lock = false;
1811         int result;
1812
1813         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1814         if (!device)
1815                 return -ENOMEM;
1816
1817         acpi_init_device_object(device, handle, type);
1818         /*
1819          * Getting the status is delayed till here so that we can call
1820          * acpi_bus_get_status() and use its quirk handling.  Note that
1821          * this must be done before the get power-/wakeup_dev-flags calls.
1822          */
1823         if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
1824                 if (dep_init) {
1825                         mutex_lock(&acpi_dep_list_lock);
1826                         /*
1827                          * Hold the lock until the acpi_tie_acpi_dev() call
1828                          * below to prevent concurrent acpi_scan_clear_dep()
1829                          * from deleting a dependency list entry without
1830                          * updating dep_unmet for the device.
1831                          */
1832                         release_dep_lock = true;
1833                         acpi_scan_dep_init(device);
1834                 }
1835                 acpi_scan_init_status(device);
1836         }
1837
1838         acpi_bus_get_power_flags(device);
1839         acpi_bus_get_wakeup_device_flags(device);
1840
1841         result = acpi_tie_acpi_dev(device);
1842
1843         if (release_dep_lock)
1844                 mutex_unlock(&acpi_dep_list_lock);
1845
1846         if (!result)
1847                 result = __acpi_device_add(device, acpi_device_release);
1848
1849         if (result) {
1850                 acpi_device_release(&device->dev);
1851                 return result;
1852         }
1853
1854         acpi_power_add_remove_device(device, true);
1855         acpi_device_add_finalize(device);
1856
1857         acpi_handle_debug(handle, "Added as %s, parent %s\n",
1858                           dev_name(&device->dev), device->parent ?
1859                                 dev_name(&device->parent->dev) : "(null)");
1860
1861         *child = device;
1862         return 0;
1863 }
1864
1865 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1866                                             void *context)
1867 {
1868         struct resource *res = context;
1869
1870         if (acpi_dev_resource_memory(ares, res))
1871                 return AE_CTRL_TERMINATE;
1872
1873         return AE_OK;
1874 }
1875
1876 static bool acpi_device_should_be_hidden(acpi_handle handle)
1877 {
1878         acpi_status status;
1879         struct resource res;
1880
1881         /* Check if it should ignore the UART device */
1882         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1883                 return false;
1884
1885         /*
1886          * The UART device described in SPCR table is assumed to have only one
1887          * memory resource present. So we only look for the first one here.
1888          */
1889         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1890                                      acpi_get_resource_memory, &res);
1891         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1892                 return false;
1893
1894         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1895                          &res.start);
1896
1897         return true;
1898 }
1899
1900 bool acpi_device_is_present(const struct acpi_device *adev)
1901 {
1902         return adev->status.present || adev->status.functional;
1903 }
1904
1905 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1906                                        const char *idstr,
1907                                        const struct acpi_device_id **matchid)
1908 {
1909         const struct acpi_device_id *devid;
1910
1911         if (handler->match)
1912                 return handler->match(idstr, matchid);
1913
1914         for (devid = handler->ids; devid->id[0]; devid++)
1915                 if (!strcmp((char *)devid->id, idstr)) {
1916                         if (matchid)
1917                                 *matchid = devid;
1918
1919                         return true;
1920                 }
1921
1922         return false;
1923 }
1924
1925 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1926                                         const struct acpi_device_id **matchid)
1927 {
1928         struct acpi_scan_handler *handler;
1929
1930         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1931                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1932                         return handler;
1933
1934         return NULL;
1935 }
1936
1937 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1938 {
1939         if (!!hotplug->enabled == !!val)
1940                 return;
1941
1942         mutex_lock(&acpi_scan_lock);
1943
1944         hotplug->enabled = val;
1945
1946         mutex_unlock(&acpi_scan_lock);
1947 }
1948
1949 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1950 {
1951         struct acpi_hardware_id *hwid;
1952
1953         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1954                 acpi_dock_add(adev);
1955                 return;
1956         }
1957         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1958                 struct acpi_scan_handler *handler;
1959
1960                 handler = acpi_scan_match_handler(hwid->id, NULL);
1961                 if (handler) {
1962                         adev->flags.hotplug_notify = true;
1963                         break;
1964                 }
1965         }
1966 }
1967
1968 static u32 acpi_scan_check_dep(acpi_handle handle, bool check_dep)
1969 {
1970         struct acpi_handle_list dep_devices;
1971         acpi_status status;
1972         u32 count;
1973         int i;
1974
1975         /*
1976          * Check for _HID here to avoid deferring the enumeration of:
1977          * 1. PCI devices.
1978          * 2. ACPI nodes describing USB ports.
1979          * Still, checking for _HID catches more then just these cases ...
1980          */
1981         if (!check_dep || !acpi_has_method(handle, "_DEP") ||
1982             !acpi_has_method(handle, "_HID"))
1983                 return 0;
1984
1985         status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices);
1986         if (ACPI_FAILURE(status)) {
1987                 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
1988                 return 0;
1989         }
1990
1991         for (count = 0, i = 0; i < dep_devices.count; i++) {
1992                 struct acpi_device_info *info;
1993                 struct acpi_dep_data *dep;
1994                 bool skip, honor_dep;
1995
1996                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1997                 if (ACPI_FAILURE(status)) {
1998                         acpi_handle_debug(handle, "Error reading _DEP device info\n");
1999                         continue;
2000                 }
2001
2002                 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
2003                 honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids);
2004                 kfree(info);
2005
2006                 if (skip)
2007                         continue;
2008
2009                 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
2010                 if (!dep)
2011                         continue;
2012
2013                 count++;
2014
2015                 dep->supplier = dep_devices.handles[i];
2016                 dep->consumer = handle;
2017                 dep->honor_dep = honor_dep;
2018
2019                 mutex_lock(&acpi_dep_list_lock);
2020                 list_add_tail(&dep->node , &acpi_dep_list);
2021                 mutex_unlock(&acpi_dep_list_lock);
2022         }
2023
2024         return count;
2025 }
2026
2027 static bool acpi_bus_scan_second_pass;
2028
2029 static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep,
2030                                       struct acpi_device **adev_p)
2031 {
2032         struct acpi_device *device = acpi_fetch_acpi_dev(handle);
2033         acpi_object_type acpi_type;
2034         int type;
2035
2036         if (device)
2037                 goto out;
2038
2039         if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
2040                 return AE_OK;
2041
2042         switch (acpi_type) {
2043         case ACPI_TYPE_DEVICE:
2044                 if (acpi_device_should_be_hidden(handle))
2045                         return AE_OK;
2046
2047                 /* Bail out if there are dependencies. */
2048                 if (acpi_scan_check_dep(handle, check_dep) > 0) {
2049                         acpi_bus_scan_second_pass = true;
2050                         return AE_CTRL_DEPTH;
2051                 }
2052
2053                 fallthrough;
2054         case ACPI_TYPE_ANY:     /* for ACPI_ROOT_OBJECT */
2055                 type = ACPI_BUS_TYPE_DEVICE;
2056                 break;
2057
2058         case ACPI_TYPE_PROCESSOR:
2059                 type = ACPI_BUS_TYPE_PROCESSOR;
2060                 break;
2061
2062         case ACPI_TYPE_THERMAL:
2063                 type = ACPI_BUS_TYPE_THERMAL;
2064                 break;
2065
2066         case ACPI_TYPE_POWER:
2067                 acpi_add_power_resource(handle);
2068                 fallthrough;
2069         default:
2070                 return AE_OK;
2071         }
2072
2073         /*
2074          * If check_dep is true at this point, the device has no dependencies,
2075          * or the creation of the device object would have been postponed above.
2076          */
2077         acpi_add_single_object(&device, handle, type, !check_dep);
2078         if (!device)
2079                 return AE_CTRL_DEPTH;
2080
2081         acpi_scan_init_hotplug(device);
2082
2083 out:
2084         if (!*adev_p)
2085                 *adev_p = device;
2086
2087         return AE_OK;
2088 }
2089
2090 static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
2091                                         void *not_used, void **ret_p)
2092 {
2093         return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
2094 }
2095
2096 static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
2097                                         void *not_used, void **ret_p)
2098 {
2099         return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
2100 }
2101
2102 static void acpi_default_enumeration(struct acpi_device *device)
2103 {
2104         /*
2105          * Do not enumerate devices with enumeration_by_parent flag set as
2106          * they will be enumerated by their respective parents.
2107          */
2108         if (!device->flags.enumeration_by_parent) {
2109                 acpi_create_platform_device(device, NULL);
2110                 acpi_device_set_enumerated(device);
2111         } else {
2112                 blocking_notifier_call_chain(&acpi_reconfig_chain,
2113                                              ACPI_RECONFIG_DEVICE_ADD, device);
2114         }
2115 }
2116
2117 static const struct acpi_device_id generic_device_ids[] = {
2118         {ACPI_DT_NAMESPACE_HID, },
2119         {"", },
2120 };
2121
2122 static int acpi_generic_device_attach(struct acpi_device *adev,
2123                                       const struct acpi_device_id *not_used)
2124 {
2125         /*
2126          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2127          * below can be unconditional.
2128          */
2129         if (adev->data.of_compatible)
2130                 acpi_default_enumeration(adev);
2131
2132         return 1;
2133 }
2134
2135 static struct acpi_scan_handler generic_device_handler = {
2136         .ids = generic_device_ids,
2137         .attach = acpi_generic_device_attach,
2138 };
2139
2140 static int acpi_scan_attach_handler(struct acpi_device *device)
2141 {
2142         struct acpi_hardware_id *hwid;
2143         int ret = 0;
2144
2145         list_for_each_entry(hwid, &device->pnp.ids, list) {
2146                 const struct acpi_device_id *devid;
2147                 struct acpi_scan_handler *handler;
2148
2149                 handler = acpi_scan_match_handler(hwid->id, &devid);
2150                 if (handler) {
2151                         if (!handler->attach) {
2152                                 device->pnp.type.platform_id = 0;
2153                                 continue;
2154                         }
2155                         device->handler = handler;
2156                         ret = handler->attach(device, devid);
2157                         if (ret > 0)
2158                                 break;
2159
2160                         device->handler = NULL;
2161                         if (ret < 0)
2162                                 break;
2163                 }
2164         }
2165
2166         return ret;
2167 }
2168
2169 static int acpi_bus_attach(struct acpi_device *device, void *first_pass)
2170 {
2171         bool skip = !first_pass && device->flags.visited;
2172         acpi_handle ejd;
2173         int ret;
2174
2175         if (skip)
2176                 goto ok;
2177
2178         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2179                 register_dock_dependent_device(device, ejd);
2180
2181         acpi_bus_get_status(device);
2182         /* Skip devices that are not ready for enumeration (e.g. not present) */
2183         if (!acpi_dev_ready_for_enumeration(device)) {
2184                 device->flags.initialized = false;
2185                 acpi_device_clear_enumerated(device);
2186                 device->flags.power_manageable = 0;
2187                 return 0;
2188         }
2189         if (device->handler)
2190                 goto ok;
2191
2192         if (!device->flags.initialized) {
2193                 device->flags.power_manageable =
2194                         device->power.states[ACPI_STATE_D0].flags.valid;
2195                 if (acpi_bus_init_power(device))
2196                         device->flags.power_manageable = 0;
2197
2198                 device->flags.initialized = true;
2199         } else if (device->flags.visited) {
2200                 goto ok;
2201         }
2202
2203         ret = acpi_scan_attach_handler(device);
2204         if (ret < 0)
2205                 return 0;
2206
2207         device->flags.match_driver = true;
2208         if (ret > 0 && !device->flags.enumeration_by_parent) {
2209                 acpi_device_set_enumerated(device);
2210                 goto ok;
2211         }
2212
2213         ret = device_attach(&device->dev);
2214         if (ret < 0)
2215                 return 0;
2216
2217         if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2218                 acpi_default_enumeration(device);
2219         else
2220                 acpi_device_set_enumerated(device);
2221
2222 ok:
2223         acpi_dev_for_each_child(device, acpi_bus_attach, first_pass);
2224
2225         if (!skip && device->handler && device->handler->hotplug.notify_online)
2226                 device->handler->hotplug.notify_online(device);
2227
2228         return 0;
2229 }
2230
2231 static int acpi_dev_get_first_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
2232 {
2233         struct acpi_device *adev;
2234
2235         adev = acpi_bus_get_acpi_device(dep->consumer);
2236         if (adev) {
2237                 *(struct acpi_device **)data = adev;
2238                 return 1;
2239         }
2240         /* Continue parsing if the device object is not present. */
2241         return 0;
2242 }
2243
2244 struct acpi_scan_clear_dep_work {
2245         struct work_struct work;
2246         struct acpi_device *adev;
2247 };
2248
2249 static void acpi_scan_clear_dep_fn(struct work_struct *work)
2250 {
2251         struct acpi_scan_clear_dep_work *cdw;
2252
2253         cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
2254
2255         acpi_scan_lock_acquire();
2256         acpi_bus_attach(cdw->adev, (void *)true);
2257         acpi_scan_lock_release();
2258
2259         acpi_dev_put(cdw->adev);
2260         kfree(cdw);
2261 }
2262
2263 static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
2264 {
2265         struct acpi_scan_clear_dep_work *cdw;
2266
2267         if (adev->dep_unmet)
2268                 return false;
2269
2270         cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
2271         if (!cdw)
2272                 return false;
2273
2274         cdw->adev = adev;
2275         INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
2276         /*
2277          * Since the work function may block on the lock until the entire
2278          * initial enumeration of devices is complete, put it into the unbound
2279          * workqueue.
2280          */
2281         queue_work(system_unbound_wq, &cdw->work);
2282
2283         return true;
2284 }
2285
2286 static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
2287 {
2288         struct acpi_device *adev = acpi_bus_get_acpi_device(dep->consumer);
2289
2290         if (adev) {
2291                 adev->dep_unmet--;
2292                 if (!acpi_scan_clear_dep_queue(adev))
2293                         acpi_dev_put(adev);
2294         }
2295
2296         list_del(&dep->node);
2297         kfree(dep);
2298
2299         return 0;
2300 }
2301
2302 /**
2303  * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list
2304  * @handle:     The ACPI handle of the supplier device
2305  * @callback:   Pointer to the callback function to apply
2306  * @data:       Pointer to some data to pass to the callback
2307  *
2308  * The return value of the callback determines this function's behaviour. If 0
2309  * is returned we continue to iterate over acpi_dep_list. If a positive value
2310  * is returned then the loop is broken but this function returns 0. If a
2311  * negative value is returned by the callback then the loop is broken and that
2312  * value is returned as the final error.
2313  */
2314 static int acpi_walk_dep_device_list(acpi_handle handle,
2315                                 int (*callback)(struct acpi_dep_data *, void *),
2316                                 void *data)
2317 {
2318         struct acpi_dep_data *dep, *tmp;
2319         int ret = 0;
2320
2321         mutex_lock(&acpi_dep_list_lock);
2322         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2323                 if (dep->supplier == handle) {
2324                         ret = callback(dep, data);
2325                         if (ret)
2326                                 break;
2327                 }
2328         }
2329         mutex_unlock(&acpi_dep_list_lock);
2330
2331         return ret > 0 ? 0 : ret;
2332 }
2333
2334 /**
2335  * acpi_dev_clear_dependencies - Inform consumers that the device is now active
2336  * @supplier: Pointer to the supplier &struct acpi_device
2337  *
2338  * Clear dependencies on the given device.
2339  */
2340 void acpi_dev_clear_dependencies(struct acpi_device *supplier)
2341 {
2342         acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
2343 }
2344 EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
2345
2346 /**
2347  * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration
2348  * @device: Pointer to the &struct acpi_device to check
2349  *
2350  * Check if the device is present and has no unmet dependencies.
2351  *
2352  * Return true if the device is ready for enumeratino. Otherwise, return false.
2353  */
2354 bool acpi_dev_ready_for_enumeration(const struct acpi_device *device)
2355 {
2356         if (device->flags.honor_deps && device->dep_unmet)
2357                 return false;
2358
2359         return acpi_device_is_present(device);
2360 }
2361 EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);
2362
2363 /**
2364  * acpi_dev_get_first_consumer_dev - Return ACPI device dependent on @supplier
2365  * @supplier: Pointer to the dependee device
2366  *
2367  * Returns the first &struct acpi_device which declares itself dependent on
2368  * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
2369  *
2370  * The caller is responsible for putting the reference to adev when it is no
2371  * longer needed.
2372  */
2373 struct acpi_device *acpi_dev_get_first_consumer_dev(struct acpi_device *supplier)
2374 {
2375         struct acpi_device *adev = NULL;
2376
2377         acpi_walk_dep_device_list(supplier->handle,
2378                                   acpi_dev_get_first_consumer_dev_cb, &adev);
2379
2380         return adev;
2381 }
2382 EXPORT_SYMBOL_GPL(acpi_dev_get_first_consumer_dev);
2383
2384 /**
2385  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2386  * @handle: Root of the namespace scope to scan.
2387  *
2388  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2389  * found devices.
2390  *
2391  * If no devices were found, -ENODEV is returned, but it does not mean that
2392  * there has been a real error.  There just have been no suitable ACPI objects
2393  * in the table trunk from which the kernel could create a device and add an
2394  * appropriate driver.
2395  *
2396  * Must be called under acpi_scan_lock.
2397  */
2398 int acpi_bus_scan(acpi_handle handle)
2399 {
2400         struct acpi_device *device = NULL;
2401
2402         acpi_bus_scan_second_pass = false;
2403
2404         /* Pass 1: Avoid enumerating devices with missing dependencies. */
2405
2406         if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2407                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2408                                     acpi_bus_check_add_1, NULL, NULL,
2409                                     (void **)&device);
2410
2411         if (!device)
2412                 return -ENODEV;
2413
2414         acpi_bus_attach(device, (void *)true);
2415
2416         if (!acpi_bus_scan_second_pass)
2417                 return 0;
2418
2419         /* Pass 2: Enumerate all of the remaining devices. */
2420
2421         device = NULL;
2422
2423         if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device)))
2424                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2425                                     acpi_bus_check_add_2, NULL, NULL,
2426                                     (void **)&device);
2427
2428         acpi_bus_attach(device, NULL);
2429
2430         return 0;
2431 }
2432 EXPORT_SYMBOL(acpi_bus_scan);
2433
2434 static int acpi_bus_trim_one(struct acpi_device *adev, void *not_used)
2435 {
2436         struct acpi_scan_handler *handler = adev->handler;
2437
2438         acpi_dev_for_each_child_reverse(adev, acpi_bus_trim_one, NULL);
2439
2440         adev->flags.match_driver = false;
2441         if (handler) {
2442                 if (handler->detach)
2443                         handler->detach(adev);
2444
2445                 adev->handler = NULL;
2446         } else {
2447                 device_release_driver(&adev->dev);
2448         }
2449         /*
2450          * Most likely, the device is going away, so put it into D3cold before
2451          * that.
2452          */
2453         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2454         adev->flags.initialized = false;
2455         acpi_device_clear_enumerated(adev);
2456
2457         return 0;
2458 }
2459
2460 /**
2461  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2462  * @adev: Root of the ACPI namespace scope to walk.
2463  *
2464  * Must be called under acpi_scan_lock.
2465  */
2466 void acpi_bus_trim(struct acpi_device *adev)
2467 {
2468         acpi_bus_trim_one(adev, NULL);
2469 }
2470 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2471
2472 int acpi_bus_register_early_device(int type)
2473 {
2474         struct acpi_device *device = NULL;
2475         int result;
2476
2477         result = acpi_add_single_object(&device, NULL, type, false);
2478         if (result)
2479                 return result;
2480
2481         device->flags.match_driver = true;
2482         return device_attach(&device->dev);
2483 }
2484 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2485
2486 static void acpi_bus_scan_fixed(void)
2487 {
2488         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2489                 struct acpi_device *adev = NULL;
2490
2491                 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON,
2492                                        false);
2493                 if (adev) {
2494                         adev->flags.match_driver = true;
2495                         if (device_attach(&adev->dev) >= 0)
2496                                 device_init_wakeup(&adev->dev, true);
2497                         else
2498                                 dev_dbg(&adev->dev, "No driver\n");
2499                 }
2500         }
2501
2502         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2503                 struct acpi_device *adev = NULL;
2504
2505                 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON,
2506                                        false);
2507                 if (adev) {
2508                         adev->flags.match_driver = true;
2509                         if (device_attach(&adev->dev) < 0)
2510                                 dev_dbg(&adev->dev, "No driver\n");
2511                 }
2512         }
2513 }
2514
2515 static void __init acpi_get_spcr_uart_addr(void)
2516 {
2517         acpi_status status;
2518         struct acpi_table_spcr *spcr_ptr;
2519
2520         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2521                                 (struct acpi_table_header **)&spcr_ptr);
2522         if (ACPI_FAILURE(status)) {
2523                 pr_warn("STAO table present, but SPCR is missing\n");
2524                 return;
2525         }
2526
2527         spcr_uart_addr = spcr_ptr->serial_port.address;
2528         acpi_put_table((struct acpi_table_header *)spcr_ptr);
2529 }
2530
2531 static bool acpi_scan_initialized;
2532
2533 void __init acpi_scan_init(void)
2534 {
2535         acpi_status status;
2536         struct acpi_table_stao *stao_ptr;
2537
2538         acpi_pci_root_init();
2539         acpi_pci_link_init();
2540         acpi_processor_init();
2541         acpi_platform_init();
2542         acpi_lpss_init();
2543         acpi_apd_init();
2544         acpi_cmos_rtc_init();
2545         acpi_container_init();
2546         acpi_memory_hotplug_init();
2547         acpi_watchdog_init();
2548         acpi_pnp_init();
2549         acpi_int340x_thermal_init();
2550         acpi_amba_init();
2551         acpi_init_lpit();
2552
2553         acpi_scan_add_handler(&generic_device_handler);
2554
2555         /*
2556          * If there is STAO table, check whether it needs to ignore the UART
2557          * device in SPCR table.
2558          */
2559         status = acpi_get_table(ACPI_SIG_STAO, 0,
2560                                 (struct acpi_table_header **)&stao_ptr);
2561         if (ACPI_SUCCESS(status)) {
2562                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2563                         pr_info("STAO Name List not yet supported.\n");
2564
2565                 if (stao_ptr->ignore_uart)
2566                         acpi_get_spcr_uart_addr();
2567
2568                 acpi_put_table((struct acpi_table_header *)stao_ptr);
2569         }
2570
2571         acpi_gpe_apply_masked_gpes();
2572         acpi_update_all_gpes();
2573
2574         /*
2575          * Although we call __add_memory() that is documented to require the
2576          * device_hotplug_lock, it is not necessary here because this is an
2577          * early code when userspace or any other code path cannot trigger
2578          * hotplug/hotunplug operations.
2579          */
2580         mutex_lock(&acpi_scan_lock);
2581         /*
2582          * Enumerate devices in the ACPI namespace.
2583          */
2584         if (acpi_bus_scan(ACPI_ROOT_OBJECT))
2585                 goto unlock;
2586
2587         acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);
2588         if (!acpi_root)
2589                 goto unlock;
2590
2591         /* Fixed feature devices do not exist on HW-reduced platform */
2592         if (!acpi_gbl_reduced_hardware)
2593                 acpi_bus_scan_fixed();
2594
2595         acpi_turn_off_unused_power_resources();
2596
2597         acpi_scan_initialized = true;
2598
2599 unlock:
2600         mutex_unlock(&acpi_scan_lock);
2601 }
2602
2603 static struct acpi_probe_entry *ape;
2604 static int acpi_probe_count;
2605 static DEFINE_MUTEX(acpi_probe_mutex);
2606
2607 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2608                                   const unsigned long end)
2609 {
2610         if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2611                 if (!ape->probe_subtbl(header, end))
2612                         acpi_probe_count++;
2613
2614         return 0;
2615 }
2616
2617 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2618 {
2619         int count = 0;
2620
2621         if (acpi_disabled)
2622                 return 0;
2623
2624         mutex_lock(&acpi_probe_mutex);
2625         for (ape = ap_head; nr; ape++, nr--) {
2626                 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2627                         acpi_probe_count = 0;
2628                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2629                         count += acpi_probe_count;
2630                 } else {
2631                         int res;
2632                         res = acpi_table_parse(ape->id, ape->probe_table);
2633                         if (!res)
2634                                 count++;
2635                 }
2636         }
2637         mutex_unlock(&acpi_probe_mutex);
2638
2639         return count;
2640 }
2641
2642 static void acpi_table_events_fn(struct work_struct *work)
2643 {
2644         acpi_scan_lock_acquire();
2645         acpi_bus_scan(ACPI_ROOT_OBJECT);
2646         acpi_scan_lock_release();
2647
2648         kfree(work);
2649 }
2650
2651 void acpi_scan_table_notify(void)
2652 {
2653         struct work_struct *work;
2654
2655         if (!acpi_scan_initialized)
2656                 return;
2657
2658         work = kmalloc(sizeof(*work), GFP_KERNEL);
2659         if (!work)
2660                 return;
2661
2662         INIT_WORK(work, acpi_table_events_fn);
2663         schedule_work(work);
2664 }
2665
2666 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2667 {
2668         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2669 }
2670 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2671
2672 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2673 {
2674         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2675 }
2676 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);