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/signal.h>
  15 #include <linux/kthread.h>
  16 #include <linux/dmi.h>
  17 #include <linux/nls.h>
  18 #include <linux/dma-map-ops.h>
  19 #include <linux/platform_data/x86/apple.h>
  20 #include <linux/pgtable.h>
  21
  22 #include "internal.h"
  23
  24 extern struct acpi_device *acpi_root;
  25
  26 #define ACPI_BUS_CLASS                  "system_bus"
  27 #define ACPI_BUS_HID                    "LNXSYBUS"
  28 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  29
  30 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  31
  32 #define INVALID_ACPI_HANDLE     ((acpi_handle)empty_zero_page)
  33
  34 static const char *dummy_hid = "device";
  35
  36 static LIST_HEAD(acpi_dep_list);
  37 static DEFINE_MUTEX(acpi_dep_list_lock);
  38 LIST_HEAD(acpi_bus_id_list);
  39 static DEFINE_MUTEX(acpi_scan_lock);
  40 static LIST_HEAD(acpi_scan_handlers_list);
  41 DEFINE_MUTEX(acpi_device_lock);
  42 LIST_HEAD(acpi_wakeup_device_list);
  43 static DEFINE_MUTEX(acpi_hp_context_lock);
  44
  45 /*
  46  * The UART device described by the SPCR table is the only object which needs
  47  * special-casing. Everything else is covered by ACPI namespace paths in STAO
  48  * table.
  49  */
  50 static u64 spcr_uart_addr;
  51
  52 struct acpi_dep_data {
  53         struct list_head node;
  54         acpi_handle supplier;
  55         acpi_handle consumer;
  56 };
  57
  58 void acpi_scan_lock_acquire(void)
  59 {
  60         mutex_lock(&acpi_scan_lock);
  61 }
  62 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  63
  64 void acpi_scan_lock_release(void)
  65 {
  66         mutex_unlock(&acpi_scan_lock);
  67 }
  68 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  69
  70 void acpi_lock_hp_context(void)
  71 {
  72         mutex_lock(&acpi_hp_context_lock);
  73 }
  74
  75 void acpi_unlock_hp_context(void)
  76 {
  77         mutex_unlock(&acpi_hp_context_lock);
  78 }
  79
  80 void acpi_initialize_hp_context(struct acpi_device *adev,
  81                                 struct acpi_hotplug_context *hp,
  82                                 int (*notify)(struct acpi_device *, u32),
  83                                 void (*uevent)(struct acpi_device *, u32))
  84 {
  85         acpi_lock_hp_context();
  86         hp->notify = notify;
  87         hp->uevent = uevent;
  88         acpi_set_hp_context(adev, hp);
  89         acpi_unlock_hp_context();
  90 }
  91 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
  92
  93 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  94 {
  95         if (!handler)
  96                 return -EINVAL;
  97
  98         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  99         return 0;
 100 }
 101
 102 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
 103                                        const char *hotplug_profile_name)
 104 {
 105         int error;
 106
 107         error = acpi_scan_add_handler(handler);
 108         if (error)
 109                 return error;
 110
 111         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
 112         return 0;
 113 }
 114
 115 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 116 {
 117         struct acpi_device_physical_node *pn;
 118         bool offline = true;
 119         char *envp[] = { "EVENT=offline", NULL };
 120
 121         /*
 122          * acpi_container_offline() calls this for all of the container's
 123          * children under the container's physical_node_lock lock.
 124          */
 125         mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 126
 127         list_for_each_entry(pn, &adev->physical_node_list, node)
 128                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
 129                         if (uevent)
 130                                 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
 131
 132                         offline = false;
 133                         break;
 134                 }
 135
 136         mutex_unlock(&adev->physical_node_lock);
 137         return offline;
 138 }
 139
 140 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 141                                     void **ret_p)
 142 {
 143         struct acpi_device *device = NULL;
 144         struct acpi_device_physical_node *pn;
 145         bool second_pass = (bool)data;
 146         acpi_status status = AE_OK;
 147
 148         if (acpi_bus_get_device(handle, &device))
 149                 return AE_OK;
 150
 151         if (device->handler && !device->handler->hotplug.enabled) {
 152                 *ret_p = &device->dev;
 153                 return AE_SUPPORT;
 154         }
 155
 156         mutex_lock(&device->physical_node_lock);
 157
 158         list_for_each_entry(pn, &device->physical_node_list, node) {
 159                 int ret;
 160
 161                 if (second_pass) {
 162                         /* Skip devices offlined by the first pass. */
 163                         if (pn->put_online)
 164                                 continue;
 165                 } else {
 166                         pn->put_online = false;
 167                 }
 168                 ret = device_offline(pn->dev);
 169                 if (ret >= 0) {
 170                         pn->put_online = !ret;
 171                 } else {
 172                         *ret_p = pn->dev;
 173                         if (second_pass) {
 174                                 status = AE_ERROR;
 175                                 break;
 176                         }
 177                 }
 178         }
 179
 180         mutex_unlock(&device->physical_node_lock);
 181
 182         return status;
 183 }
 184
 185 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 186                                    void **ret_p)
 187 {
 188         struct acpi_device *device = NULL;
 189         struct acpi_device_physical_node *pn;
 190
 191         if (acpi_bus_get_device(handle, &device))
 192                 return AE_OK;
 193
 194         mutex_lock(&device->physical_node_lock);
 195
 196         list_for_each_entry(pn, &device->physical_node_list, node)
 197                 if (pn->put_online) {
 198                         device_online(pn->dev);
 199                         pn->put_online = false;
 200                 }
 201
 202         mutex_unlock(&device->physical_node_lock);
 203
 204         return AE_OK;
 205 }
 206
 207 static int acpi_scan_try_to_offline(struct acpi_device *device)
 208 {
 209         acpi_handle handle = device->handle;
 210         struct device *errdev = NULL;
 211         acpi_status status;
 212
 213         /*
 214          * Carry out two passes here and ignore errors in the first pass,
 215          * because if the devices in question are memory blocks and
 216          * CONFIG_MEMCG is set, one of the blocks may hold data structures
 217          * that the other blocks depend on, but it is not known in advance which
 218          * block holds them.
 219          *
 220          * If the first pass is successful, the second one isn't needed, though.
 221          */
 222         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 223                                      NULL, acpi_bus_offline, (void *)false,
 224                                      (void **)&errdev);
 225         if (status == AE_SUPPORT) {
 226                 dev_warn(errdev, "Offline disabled.\n");
 227                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 228                                     acpi_bus_online, NULL, NULL, NULL);
 229                 return -EPERM;
 230         }
 231         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
 232         if (errdev) {
 233                 errdev = NULL;
 234                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 235                                     NULL, acpi_bus_offline, (void *)true,
 236                                     (void **)&errdev);
 237                 if (!errdev)
 238                         acpi_bus_offline(handle, 0, (void *)true,
 239                                          (void **)&errdev);
 240
 241                 if (errdev) {
 242                         dev_warn(errdev, "Offline failed.\n");
 243                         acpi_bus_online(handle, 0, NULL, NULL);
 244                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
 245                                             ACPI_UINT32_MAX, acpi_bus_online,
 246                                             NULL, NULL, NULL);
 247                         return -EBUSY;
 248                 }
 249         }
 250         return 0;
 251 }
 252
 253 static int acpi_scan_hot_remove(struct acpi_device *device)
 254 {
 255         acpi_handle handle = device->handle;
 256         unsigned long long sta;
 257         acpi_status status;
 258
 259         if (device->handler && device->handler->hotplug.demand_offline) {
 260                 if (!acpi_scan_is_offline(device, true))
 261                         return -EBUSY;
 262         } else {
 263                 int error = acpi_scan_try_to_offline(device);
 264                 if (error)
 265                         return error;
 266         }
 267
 268         acpi_handle_debug(handle, "Ejecting\n");
 269
 270         acpi_bus_trim(device);
 271
 272         acpi_evaluate_lck(handle, 0);
 273         /*
 274          * TBD: _EJD support.
 275          */
 276         status = acpi_evaluate_ej0(handle);
 277         if (status == AE_NOT_FOUND)
 278                 return -ENODEV;
 279         else if (ACPI_FAILURE(status))
 280                 return -EIO;
 281
 282         /*
 283          * Verify if eject was indeed successful.  If not, log an error
 284          * message.  No need to call _OST since _EJ0 call was made OK.
 285          */
 286         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 287         if (ACPI_FAILURE(status)) {
 288                 acpi_handle_warn(handle,
 289                         "Status check after eject failed (0x%x)\n", status);
 290         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
 291                 acpi_handle_warn(handle,
 292                         "Eject incomplete - status 0x%llx\n", sta);
 293         }
 294
 295         return 0;
 296 }
 297
 298 static int acpi_scan_device_not_present(struct acpi_device *adev)
 299 {
 300         if (!acpi_device_enumerated(adev)) {
 301                 dev_warn(&adev->dev, "Still not present\n");
 302                 return -EALREADY;
 303         }
 304         acpi_bus_trim(adev);
 305         return 0;
 306 }
 307
 308 static int acpi_scan_device_check(struct acpi_device *adev)
 309 {
 310         int error;
 311
 312         acpi_bus_get_status(adev);
 313         if (adev->status.present || adev->status.functional) {
 314                 /*
 315                  * This function is only called for device objects for which
 316                  * matching scan handlers exist.  The only situation in which
 317                  * the scan handler is not attached to this device object yet
 318                  * is when the device has just appeared (either it wasn't
 319                  * present at all before or it was removed and then added
 320                  * again).
 321                  */
 322                 if (adev->handler) {
 323                         dev_warn(&adev->dev, "Already enumerated\n");
 324                         return -EALREADY;
 325                 }
 326                 error = acpi_bus_scan(adev->handle);
 327                 if (error) {
 328                         dev_warn(&adev->dev, "Namespace scan failure\n");
 329                         return error;
 330                 }
 331                 if (!adev->handler) {
 332                         dev_warn(&adev->dev, "Enumeration failure\n");
 333                         error = -ENODEV;
 334                 }
 335         } else {
 336                 error = acpi_scan_device_not_present(adev);
 337         }
 338         return error;
 339 }
 340
 341 static int acpi_scan_bus_check(struct acpi_device *adev)
 342 {
 343         struct acpi_scan_handler *handler = adev->handler;
 344         struct acpi_device *child;
 345         int error;
 346
 347         acpi_bus_get_status(adev);
 348         if (!(adev->status.present || adev->status.functional)) {
 349                 acpi_scan_device_not_present(adev);
 350                 return 0;
 351         }
 352         if (handler && handler->hotplug.scan_dependent)
 353                 return handler->hotplug.scan_dependent(adev);
 354
 355         error = acpi_bus_scan(adev->handle);
 356         if (error) {
 357                 dev_warn(&adev->dev, "Namespace scan failure\n");
 358                 return error;
 359         }
 360         list_for_each_entry(child, &adev->children, node) {
 361                 error = acpi_scan_bus_check(child);
 362                 if (error)
 363                         return error;
 364         }
 365         return 0;
 366 }
 367
 368 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 369 {
 370         switch (type) {
 371         case ACPI_NOTIFY_BUS_CHECK:
 372                 return acpi_scan_bus_check(adev);
 373         case ACPI_NOTIFY_DEVICE_CHECK:
 374                 return acpi_scan_device_check(adev);
 375         case ACPI_NOTIFY_EJECT_REQUEST:
 376         case ACPI_OST_EC_OSPM_EJECT:
 377                 if (adev->handler && !adev->handler->hotplug.enabled) {
 378                         dev_info(&adev->dev, "Eject disabled\n");
 379                         return -EPERM;
 380                 }
 381                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
 382                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 383                 return acpi_scan_hot_remove(adev);
 384         }
 385         return -EINVAL;
 386 }
 387
 388 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 389 {
 390         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 391         int error = -ENODEV;
 392
 393         lock_device_hotplug();
 394         mutex_lock(&acpi_scan_lock);
 395
 396         /*
 397          * The device object's ACPI handle cannot become invalid as long as we
 398          * are holding acpi_scan_lock, but it might have become invalid before
 399          * that lock was acquired.
 400          */
 401         if (adev->handle == INVALID_ACPI_HANDLE)
 402                 goto err_out;
 403
 404         if (adev->flags.is_dock_station) {
 405                 error = dock_notify(adev, src);
 406         } else if (adev->flags.hotplug_notify) {
 407                 error = acpi_generic_hotplug_event(adev, src);
 408         } else {
 409                 int (*notify)(struct acpi_device *, u32);
 410
 411                 acpi_lock_hp_context();
 412                 notify = adev->hp ? adev->hp->notify : NULL;
 413                 acpi_unlock_hp_context();
 414                 /*
 415                  * There may be additional notify handlers for device objects
 416                  * without the .event() callback, so ignore them here.
 417                  */
 418                 if (notify)
 419                         error = notify(adev, src);
 420                 else
 421                         goto out;
 422         }
 423         switch (error) {
 424         case 0:
 425                 ost_code = ACPI_OST_SC_SUCCESS;
 426                 break;
 427         case -EPERM:
 428                 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 429                 break;
 430         case -EBUSY:
 431                 ost_code = ACPI_OST_SC_DEVICE_BUSY;
 432                 break;
 433         default:
 434                 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 435                 break;
 436         }
 437
 438  err_out:
 439         acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 440
 441  out:
 442         acpi_bus_put_acpi_device(adev);
 443         mutex_unlock(&acpi_scan_lock);
 444         unlock_device_hotplug();
 445 }
 446
 447 static void acpi_free_power_resources_lists(struct acpi_device *device)
 448 {
 449         int i;
 450
 451         if (device->wakeup.flags.valid)
 452                 acpi_power_resources_list_free(&device->wakeup.resources);
 453
 454         if (!device->power.flags.power_resources)
 455                 return;
 456
 457         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 458                 struct acpi_device_power_state *ps = &device->power.states[i];
 459                 acpi_power_resources_list_free(&ps->resources);
 460         }
 461 }
 462
 463 static void acpi_device_release(struct device *dev)
 464 {
 465         struct acpi_device *acpi_dev = to_acpi_device(dev);
 466
 467         acpi_free_properties(acpi_dev);
 468         acpi_free_pnp_ids(&acpi_dev->pnp);
 469         acpi_free_power_resources_lists(acpi_dev);
 470         kfree(acpi_dev);
 471 }
 472
 473 static void acpi_device_del(struct acpi_device *device)
 474 {
 475         struct acpi_device_bus_id *acpi_device_bus_id;
 476
 477         mutex_lock(&acpi_device_lock);
 478         if (device->parent)
 479                 list_del(&device->node);
 480
 481         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
 482                 if (!strcmp(acpi_device_bus_id->bus_id,
 483                             acpi_device_hid(device))) {
 484                         ida_simple_remove(&acpi_device_bus_id->instance_ida, device->pnp.instance_no);
 485                         if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
 486                                 list_del(&acpi_device_bus_id->node);
 487                                 kfree_const(acpi_device_bus_id->bus_id);
 488                                 kfree(acpi_device_bus_id);
 489                         }
 490                         break;
 491                 }
 492
 493         list_del(&device->wakeup_list);
 494         mutex_unlock(&acpi_device_lock);
 495
 496         acpi_power_add_remove_device(device, false);
 497         acpi_device_remove_files(device);
 498         if (device->remove)
 499                 device->remove(device);
 500
 501         device_del(&device->dev);
 502 }
 503
 504 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
 505
 506 static LIST_HEAD(acpi_device_del_list);
 507 static DEFINE_MUTEX(acpi_device_del_lock);
 508
 509 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 510 {
 511         for (;;) {
 512                 struct acpi_device *adev;
 513
 514                 mutex_lock(&acpi_device_del_lock);
 515
 516                 if (list_empty(&acpi_device_del_list)) {
 517                         mutex_unlock(&acpi_device_del_lock);
 518                         break;
 519                 }
 520                 adev = list_first_entry(&acpi_device_del_list,
 521                                         struct acpi_device, del_list);
 522                 list_del(&adev->del_list);
 523
 524                 mutex_unlock(&acpi_device_del_lock);
 525
 526                 blocking_notifier_call_chain(&acpi_reconfig_chain,
 527                                              ACPI_RECONFIG_DEVICE_REMOVE, adev);
 528
 529                 acpi_device_del(adev);
 530                 /*
 531                  * Drop references to all power resources that might have been
 532                  * used by the device.
 533                  */
 534                 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 535                 acpi_dev_put(adev);
 536         }
 537 }
 538
 539 /**
 540  * acpi_scan_drop_device - Drop an ACPI device object.
 541  * @handle: Handle of an ACPI namespace node, not used.
 542  * @context: Address of the ACPI device object to drop.
 543  *
 544  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 545  * namespace node the device object pointed to by @context is attached to.
 546  *
 547  * The unregistration is carried out asynchronously to avoid running
 548  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 549  * ensure the correct ordering (the device objects must be unregistered in the
 550  * same order in which the corresponding namespace nodes are deleted).
 551  */
 552 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 553 {
 554         static DECLARE_WORK(work, acpi_device_del_work_fn);
 555         struct acpi_device *adev = context;
 556
 557         mutex_lock(&acpi_device_del_lock);
 558
 559         /*
 560          * Use the ACPI hotplug workqueue which is ordered, so this work item
 561          * won't run after any hotplug work items submitted subsequently.  That
 562          * prevents attempts to register device objects identical to those being
 563          * deleted from happening concurrently (such attempts result from
 564          * hotplug events handled via the ACPI hotplug workqueue).  It also will
 565          * run after all of the work items submitted previously, which helps
 566          * those work items to ensure that they are not accessing stale device
 567          * objects.
 568          */
 569         if (list_empty(&acpi_device_del_list))
 570                 acpi_queue_hotplug_work(&work);
 571
 572         list_add_tail(&adev->del_list, &acpi_device_del_list);
 573         /* Make acpi_ns_validate_handle() return NULL for this handle. */
 574         adev->handle = INVALID_ACPI_HANDLE;
 575
 576         mutex_unlock(&acpi_device_del_lock);
 577 }
 578
 579 static struct acpi_device *handle_to_device(acpi_handle handle,
 580                                             void (*callback)(void *))
 581 {
 582         struct acpi_device *adev = NULL;
 583         acpi_status status;
 584
 585         status = acpi_get_data_full(handle, acpi_scan_drop_device,
 586                                     (void **)&adev, callback);
 587         if (ACPI_FAILURE(status) || !adev) {
 588                 acpi_handle_debug(handle, "No context!\n");
 589                 return NULL;
 590         }
 591         return adev;
 592 }
 593
 594 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 595 {
 596         if (!device)
 597                 return -EINVAL;
 598
 599         *device = handle_to_device(handle, NULL);
 600         if (!*device)
 601                 return -ENODEV;
 602
 603         return 0;
 604 }
 605 EXPORT_SYMBOL(acpi_bus_get_device);
 606
 607 static void get_acpi_device(void *dev)
 608 {
 609         acpi_dev_get(dev);
 610 }
 611
 612 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 613 {
 614         return handle_to_device(handle, get_acpi_device);
 615 }
 616
 617 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 618 {
 619         acpi_dev_put(adev);
 620 }
 621
 622 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
 623 {
 624         struct acpi_device_bus_id *acpi_device_bus_id;
 625
 626         /* Find suitable bus_id and instance number in acpi_bus_id_list. */
 627         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 628                 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
 629                         return acpi_device_bus_id;
 630         }
 631         return NULL;
 632 }
 633
 634 static int acpi_device_set_name(struct acpi_device *device,
 635                                 struct acpi_device_bus_id *acpi_device_bus_id)
 636 {
 637         struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
 638         int result;
 639
 640         result = ida_simple_get(instance_ida, 0, ACPI_MAX_DEVICE_INSTANCES, GFP_KERNEL);
 641         if (result < 0)
 642                 return result;
 643
 644         device->pnp.instance_no = result;
 645         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
 646         return 0;
 647 }
 648
 649 int acpi_device_add(struct acpi_device *device,
 650                     void (*release)(struct device *))
 651 {
 652         struct acpi_device_bus_id *acpi_device_bus_id;
 653         int result;
 654
 655         if (device->handle) {
 656                 acpi_status status;
 657
 658                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
 659                                           device);
 660                 if (ACPI_FAILURE(status)) {
 661                         acpi_handle_err(device->handle,
 662                                         "Unable to attach device data\n");
 663                         return -ENODEV;
 664                 }
 665         }
 666
 667         /*
 668          * Linkage
 669          * -------
 670          * Link this device to its parent and siblings.
 671          */
 672         INIT_LIST_HEAD(&device->children);
 673         INIT_LIST_HEAD(&device->node);
 674         INIT_LIST_HEAD(&device->wakeup_list);
 675         INIT_LIST_HEAD(&device->physical_node_list);
 676         INIT_LIST_HEAD(&device->del_list);
 677         mutex_init(&device->physical_node_lock);
 678
 679         mutex_lock(&acpi_device_lock);
 680
 681         acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
 682         if (acpi_device_bus_id) {
 683                 result = acpi_device_set_name(device, acpi_device_bus_id);
 684                 if (result)
 685                         goto err_unlock;
 686         } else {
 687                 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
 688                                              GFP_KERNEL);
 689                 if (!acpi_device_bus_id) {
 690                         result = -ENOMEM;
 691                         goto err_unlock;
 692                 }
 693                 acpi_device_bus_id->bus_id =
 694                         kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
 695                 if (!acpi_device_bus_id->bus_id) {
 696                         kfree(acpi_device_bus_id);
 697                         result = -ENOMEM;
 698                         goto err_unlock;
 699                 }
 700
 701                 ida_init(&acpi_device_bus_id->instance_ida);
 702
 703                 result = acpi_device_set_name(device, acpi_device_bus_id);
 704                 if (result) {
 705                         kfree_const(acpi_device_bus_id->bus_id);
 706                         kfree(acpi_device_bus_id);
 707                         goto err_unlock;
 708                 }
 709
 710                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 711         }
 712
 713         if (device->parent)
 714                 list_add_tail(&device->node, &device->parent->children);
 715
 716         if (device->wakeup.flags.valid)
 717                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 718
 719         mutex_unlock(&acpi_device_lock);
 720
 721         if (device->parent)
 722                 device->dev.parent = &device->parent->dev;
 723
 724         device->dev.bus = &acpi_bus_type;
 725         device->dev.release = release;
 726         result = device_add(&device->dev);
 727         if (result) {
 728                 dev_err(&device->dev, "Error registering device\n");
 729                 goto err;
 730         }
 731
 732         result = acpi_device_setup_files(device);
 733         if (result)
 734                 pr_err("Error creating sysfs interface for device %s\n",
 735                        dev_name(&device->dev));
 736
 737         return 0;
 738
 739 err:
 740         mutex_lock(&acpi_device_lock);
 741
 742         if (device->parent)
 743                 list_del(&device->node);
 744
 745         list_del(&device->wakeup_list);
 746
 747 err_unlock:
 748         mutex_unlock(&acpi_device_lock);
 749
 750         acpi_detach_data(device->handle, acpi_scan_drop_device);
 751
 752         return result;
 753 }
 754
 755 /* --------------------------------------------------------------------------
 756                                  Device Enumeration
 757    -------------------------------------------------------------------------- */
 758 static bool acpi_info_matches_ids(struct acpi_device_info *info,
 759                                   const char * const ids[])
 760 {
 761         struct acpi_pnp_device_id_list *cid_list = NULL;
 762         int i, index;
 763
 764         if (!(info->valid & ACPI_VALID_HID))
 765                 return false;
 766
 767         index = match_string(ids, -1, info->hardware_id.string);
 768         if (index >= 0)
 769                 return true;
 770
 771         if (info->valid & ACPI_VALID_CID)
 772                 cid_list = &info->compatible_id_list;
 773
 774         if (!cid_list)
 775                 return false;
 776
 777         for (i = 0; i < cid_list->count; i++) {
 778                 index = match_string(ids, -1, cid_list->ids[i].string);
 779                 if (index >= 0)
 780                         return true;
 781         }
 782
 783         return false;
 784 }
 785
 786 /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
 787 static const char * const acpi_ignore_dep_ids[] = {
 788         "PNP0D80", /* Windows-compatible System Power Management Controller */
 789         "INT33BD", /* Intel Baytrail Mailbox Device */
 790         NULL
 791 };
 792
 793 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 794 {
 795         struct acpi_device *device = NULL;
 796         acpi_status status;
 797
 798         /*
 799          * Fixed hardware devices do not appear in the namespace and do not
 800          * have handles, but we fabricate acpi_devices for them, so we have
 801          * to deal with them specially.
 802          */
 803         if (!handle)
 804                 return acpi_root;
 805
 806         do {
 807                 status = acpi_get_parent(handle, &handle);
 808                 if (ACPI_FAILURE(status))
 809                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 810         } while (acpi_bus_get_device(handle, &device));
 811         return device;
 812 }
 813
 814 acpi_status
 815 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 816 {
 817         acpi_status status;
 818         acpi_handle tmp;
 819         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 820         union acpi_object *obj;
 821
 822         status = acpi_get_handle(handle, "_EJD", &tmp);
 823         if (ACPI_FAILURE(status))
 824                 return status;
 825
 826         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 827         if (ACPI_SUCCESS(status)) {
 828                 obj = buffer.pointer;
 829                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 830                                          ejd);
 831                 kfree(buffer.pointer);
 832         }
 833         return status;
 834 }
 835 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 836
 837 static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
 838 {
 839         acpi_handle handle = dev->handle;
 840         struct acpi_device_wakeup *wakeup = &dev->wakeup;
 841         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 842         union acpi_object *package = NULL;
 843         union acpi_object *element = NULL;
 844         acpi_status status;
 845         int err = -ENODATA;
 846
 847         INIT_LIST_HEAD(&wakeup->resources);
 848
 849         /* _PRW */
 850         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 851         if (ACPI_FAILURE(status)) {
 852                 acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
 853                                  acpi_format_exception(status));
 854                 return err;
 855         }
 856
 857         package = (union acpi_object *)buffer.pointer;
 858
 859         if (!package || package->package.count < 2)
 860                 goto out;
 861
 862         element = &(package->package.elements[0]);
 863         if (!element)
 864                 goto out;
 865
 866         if (element->type == ACPI_TYPE_PACKAGE) {
 867                 if ((element->package.count < 2) ||
 868                     (element->package.elements[0].type !=
 869                      ACPI_TYPE_LOCAL_REFERENCE)
 870                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 871                         goto out;
 872
 873                 wakeup->gpe_device =
 874                     element->package.elements[0].reference.handle;
 875                 wakeup->gpe_number =
 876                     (u32) element->package.elements[1].integer.value;
 877         } else if (element->type == ACPI_TYPE_INTEGER) {
 878                 wakeup->gpe_device = NULL;
 879                 wakeup->gpe_number = element->integer.value;
 880         } else {
 881                 goto out;
 882         }
 883
 884         element = &(package->package.elements[1]);
 885         if (element->type != ACPI_TYPE_INTEGER)
 886                 goto out;
 887
 888         wakeup->sleep_state = element->integer.value;
 889
 890         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 891         if (err)
 892                 goto out;
 893
 894         if (!list_empty(&wakeup->resources)) {
 895                 int sleep_state;
 896
 897                 err = acpi_power_wakeup_list_init(&wakeup->resources,
 898                                                   &sleep_state);
 899                 if (err) {
 900                         acpi_handle_warn(handle, "Retrieving current states "
 901                                          "of wakeup power resources failed\n");
 902                         acpi_power_resources_list_free(&wakeup->resources);
 903                         goto out;
 904                 }
 905                 if (sleep_state < wakeup->sleep_state) {
 906                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 907                                          "(S%d) by S%d from power resources\n",
 908                                          (int)wakeup->sleep_state, sleep_state);
 909                         wakeup->sleep_state = sleep_state;
 910                 }
 911         }
 912
 913  out:
 914         kfree(buffer.pointer);
 915         return err;
 916 }
 917
 918 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
 919 {
 920         static const struct acpi_device_id button_device_ids[] = {
 921                 {"PNP0C0C", 0},         /* Power button */
 922                 {"PNP0C0D", 0},         /* Lid */
 923                 {"PNP0C0E", 0},         /* Sleep button */
 924                 {"", 0},
 925         };
 926         struct acpi_device_wakeup *wakeup = &device->wakeup;
 927         acpi_status status;
 928
 929         wakeup->flags.notifier_present = 0;
 930
 931         /* Power button, Lid switch always enable wakeup */
 932         if (!acpi_match_device_ids(device, button_device_ids)) {
 933                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 934                         /* Do not use Lid/sleep button for S5 wakeup */
 935                         if (wakeup->sleep_state == ACPI_STATE_S5)
 936                                 wakeup->sleep_state = ACPI_STATE_S4;
 937                 }
 938                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
 939                 device_set_wakeup_capable(&device->dev, true);
 940                 return true;
 941         }
 942
 943         status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
 944                                          wakeup->gpe_number);
 945         return ACPI_SUCCESS(status);
 946 }
 947
 948 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 949 {
 950         int err;
 951
 952         /* Presence of _PRW indicates wake capable */
 953         if (!acpi_has_method(device->handle, "_PRW"))
 954                 return;
 955
 956         err = acpi_bus_extract_wakeup_device_power_package(device);
 957         if (err) {
 958                 dev_err(&device->dev, "Unable to extract wakeup power resources");
 959                 return;
 960         }
 961
 962         device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
 963         device->wakeup.prepare_count = 0;
 964         /*
 965          * Call _PSW/_DSW object to disable its ability to wake the sleeping
 966          * system for the ACPI device with the _PRW object.
 967          * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
 968          * So it is necessary to call _DSW object first. Only when it is not
 969          * present will the _PSW object used.
 970          */
 971         err = acpi_device_sleep_wake(device, 0, 0, 0);
 972         if (err)
 973                 pr_debug("error in _DSW or _PSW evaluation\n");
 974 }
 975
 976 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 977 {
 978         struct acpi_device_power_state *ps = &device->power.states[state];
 979         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
 980         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 981         acpi_status status;
 982
 983         INIT_LIST_HEAD(&ps->resources);
 984
 985         /* Evaluate "_PRx" to get referenced power resources */
 986         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
 987         if (ACPI_SUCCESS(status)) {
 988                 union acpi_object *package = buffer.pointer;
 989
 990                 if (buffer.length && package
 991                     && package->type == ACPI_TYPE_PACKAGE
 992                     && package->package.count)
 993                         acpi_extract_power_resources(package, 0, &ps->resources);
 994
 995                 ACPI_FREE(buffer.pointer);
 996         }
 997
 998         /* Evaluate "_PSx" to see if we can do explicit sets */
 999         pathname[2] = 'S';
1000         if (acpi_has_method(device->handle, pathname))
1001                 ps->flags.explicit_set = 1;
1002
1003         /* State is valid if there are means to put the device into it. */
1004         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
1005                 ps->flags.valid = 1;
1006
1007         ps->power = -1;         /* Unknown - driver assigned */
1008         ps->latency = -1;       /* Unknown - driver assigned */
1009 }
1010
1011 static void acpi_bus_get_power_flags(struct acpi_device *device)
1012 {
1013         u32 i;
1014
1015         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1016         if (!acpi_has_method(device->handle, "_PS0") &&
1017             !acpi_has_method(device->handle, "_PR0"))
1018                 return;
1019
1020         device->flags.power_manageable = 1;
1021
1022         /*
1023          * Power Management Flags
1024          */
1025         if (acpi_has_method(device->handle, "_PSC"))
1026                 device->power.flags.explicit_get = 1;
1027
1028         if (acpi_has_method(device->handle, "_IRC"))
1029                 device->power.flags.inrush_current = 1;
1030
1031         if (acpi_has_method(device->handle, "_DSW"))
1032                 device->power.flags.dsw_present = 1;
1033
1034         /*
1035          * Enumerate supported power management states
1036          */
1037         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1038                 acpi_bus_init_power_state(device, i);
1039
1040         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1041
1042         /* Set the defaults for D0 and D3hot (always supported). */
1043         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1044         device->power.states[ACPI_STATE_D0].power = 100;
1045         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1046
1047         /*
1048          * Use power resources only if the D0 list of them is populated, because
1049          * some platforms may provide _PR3 only to indicate D3cold support and
1050          * in those cases the power resources list returned by it may be bogus.
1051          */
1052         if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1053                 device->power.flags.power_resources = 1;
1054                 /*
1055                  * D3cold is supported if the D3hot list of power resources is
1056                  * not empty.
1057                  */
1058                 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1059                         device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1060         }
1061
1062         if (acpi_bus_init_power(device))
1063                 device->flags.power_manageable = 0;
1064 }
1065
1066 static void acpi_bus_get_flags(struct acpi_device *device)
1067 {
1068         /* Presence of _STA indicates 'dynamic_status' */
1069         if (acpi_has_method(device->handle, "_STA"))
1070                 device->flags.dynamic_status = 1;
1071
1072         /* Presence of _RMV indicates 'removable' */
1073         if (acpi_has_method(device->handle, "_RMV"))
1074                 device->flags.removable = 1;
1075
1076         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1077         if (acpi_has_method(device->handle, "_EJD") ||
1078             acpi_has_method(device->handle, "_EJ0"))
1079                 device->flags.ejectable = 1;
1080 }
1081
1082 static void acpi_device_get_busid(struct acpi_device *device)
1083 {
1084         char bus_id[5] = { '?', 0 };
1085         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1086         int i = 0;
1087
1088         /*
1089          * Bus ID
1090          * ------
1091          * The device's Bus ID is simply the object name.
1092          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1093          */
1094         if (ACPI_IS_ROOT_DEVICE(device)) {
1095                 strcpy(device->pnp.bus_id, "ACPI");
1096                 return;
1097         }
1098
1099         switch (device->device_type) {
1100         case ACPI_BUS_TYPE_POWER_BUTTON:
1101                 strcpy(device->pnp.bus_id, "PWRF");
1102                 break;
1103         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1104                 strcpy(device->pnp.bus_id, "SLPF");
1105                 break;
1106         case ACPI_BUS_TYPE_ECDT_EC:
1107                 strcpy(device->pnp.bus_id, "ECDT");
1108                 break;
1109         default:
1110                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1111                 /* Clean up trailing underscores (if any) */
1112                 for (i = 3; i > 1; i--) {
1113                         if (bus_id[i] == '_')
1114                                 bus_id[i] = '\0';
1115                         else
1116                                 break;
1117                 }
1118                 strcpy(device->pnp.bus_id, bus_id);
1119                 break;
1120         }
1121 }
1122
1123 /*
1124  * acpi_ata_match - see if an acpi object is an ATA device
1125  *
1126  * If an acpi object has one of the ACPI ATA methods defined,
1127  * then we can safely call it an ATA device.
1128  */
1129 bool acpi_ata_match(acpi_handle handle)
1130 {
1131         return acpi_has_method(handle, "_GTF") ||
1132                acpi_has_method(handle, "_GTM") ||
1133                acpi_has_method(handle, "_STM") ||
1134                acpi_has_method(handle, "_SDD");
1135 }
1136
1137 /*
1138  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1139  *
1140  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1141  * then we can safely call it an ejectable drive bay
1142  */
1143 bool acpi_bay_match(acpi_handle handle)
1144 {
1145         acpi_handle phandle;
1146
1147         if (!acpi_has_method(handle, "_EJ0"))
1148                 return false;
1149         if (acpi_ata_match(handle))
1150                 return true;
1151         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1152                 return false;
1153
1154         return acpi_ata_match(phandle);
1155 }
1156
1157 bool acpi_device_is_battery(struct acpi_device *adev)
1158 {
1159         struct acpi_hardware_id *hwid;
1160
1161         list_for_each_entry(hwid, &adev->pnp.ids, list)
1162                 if (!strcmp("PNP0C0A", hwid->id))
1163                         return true;
1164
1165         return false;
1166 }
1167
1168 static bool is_ejectable_bay(struct acpi_device *adev)
1169 {
1170         acpi_handle handle = adev->handle;
1171
1172         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1173                 return true;
1174
1175         return acpi_bay_match(handle);
1176 }
1177
1178 /*
1179  * acpi_dock_match - see if an acpi object has a _DCK method
1180  */
1181 bool acpi_dock_match(acpi_handle handle)
1182 {
1183         return acpi_has_method(handle, "_DCK");
1184 }
1185
1186 static acpi_status
1187 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1188                           void **return_value)
1189 {
1190         long *cap = context;
1191
1192         if (acpi_has_method(handle, "_BCM") &&
1193             acpi_has_method(handle, "_BCL")) {
1194                 acpi_handle_debug(handle, "Found generic backlight support\n");
1195                 *cap |= ACPI_VIDEO_BACKLIGHT;
1196                 /* We have backlight support, no need to scan further */
1197                 return AE_CTRL_TERMINATE;
1198         }
1199         return 0;
1200 }
1201
1202 /* Returns true if the ACPI object is a video device which can be
1203  * handled by video.ko.
1204  * The device will get a Linux specific CID added in scan.c to
1205  * identify the device as an ACPI graphics device
1206  * Be aware that the graphics device may not be physically present
1207  * Use acpi_video_get_capabilities() to detect general ACPI video
1208  * capabilities of present cards
1209  */
1210 long acpi_is_video_device(acpi_handle handle)
1211 {
1212         long video_caps = 0;
1213
1214         /* Is this device able to support video switching ? */
1215         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1216                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1217
1218         /* Is this device able to retrieve a video ROM ? */
1219         if (acpi_has_method(handle, "_ROM"))
1220                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1221
1222         /* Is this device able to configure which video head to be POSTed ? */
1223         if (acpi_has_method(handle, "_VPO") &&
1224             acpi_has_method(handle, "_GPD") &&
1225             acpi_has_method(handle, "_SPD"))
1226                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1227
1228         /* Only check for backlight functionality if one of the above hit. */
1229         if (video_caps)
1230                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1231                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1232                                     &video_caps, NULL);
1233
1234         return video_caps;
1235 }
1236 EXPORT_SYMBOL(acpi_is_video_device);
1237
1238 const char *acpi_device_hid(struct acpi_device *device)
1239 {
1240         struct acpi_hardware_id *hid;
1241
1242         if (list_empty(&device->pnp.ids))
1243                 return dummy_hid;
1244
1245         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1246         return hid->id;
1247 }
1248 EXPORT_SYMBOL(acpi_device_hid);
1249
1250 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1251 {
1252         struct acpi_hardware_id *id;
1253
1254         id = kmalloc(sizeof(*id), GFP_KERNEL);
1255         if (!id)
1256                 return;
1257
1258         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1259         if (!id->id) {
1260                 kfree(id);
1261                 return;
1262         }
1263
1264         list_add_tail(&id->list, &pnp->ids);
1265         pnp->type.hardware_id = 1;
1266 }
1267
1268 /*
1269  * Old IBM workstations have a DSDT bug wherein the SMBus object
1270  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1271  * prefix.  Work around this.
1272  */
1273 static bool acpi_ibm_smbus_match(acpi_handle handle)
1274 {
1275         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1276         struct acpi_buffer path = { sizeof(node_name), node_name };
1277
1278         if (!dmi_name_in_vendors("IBM"))
1279                 return false;
1280
1281         /* Look for SMBS object */
1282         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1283             strcmp("SMBS", path.pointer))
1284                 return false;
1285
1286         /* Does it have the necessary (but misnamed) methods? */
1287         if (acpi_has_method(handle, "SBI") &&
1288             acpi_has_method(handle, "SBR") &&
1289             acpi_has_method(handle, "SBW"))
1290                 return true;
1291
1292         return false;
1293 }
1294
1295 static bool acpi_object_is_system_bus(acpi_handle handle)
1296 {
1297         acpi_handle tmp;
1298
1299         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1300             tmp == handle)
1301                 return true;
1302         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1303             tmp == handle)
1304                 return true;
1305
1306         return false;
1307 }
1308
1309 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1310                              int device_type)
1311 {
1312         struct acpi_device_info *info = NULL;
1313         struct acpi_pnp_device_id_list *cid_list;
1314         int i;
1315
1316         switch (device_type) {
1317         case ACPI_BUS_TYPE_DEVICE:
1318                 if (handle == ACPI_ROOT_OBJECT) {
1319                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1320                         break;
1321                 }
1322
1323                 acpi_get_object_info(handle, &info);
1324                 if (!info) {
1325                         pr_err("%s: Error reading device info\n", __func__);
1326                         return;
1327                 }
1328
1329                 if (info->valid & ACPI_VALID_HID) {
1330                         acpi_add_id(pnp, info->hardware_id.string);
1331                         pnp->type.platform_id = 1;
1332                 }
1333                 if (info->valid & ACPI_VALID_CID) {
1334                         cid_list = &info->compatible_id_list;
1335                         for (i = 0; i < cid_list->count; i++)
1336                                 acpi_add_id(pnp, cid_list->ids[i].string);
1337                 }
1338                 if (info->valid & ACPI_VALID_ADR) {
1339                         pnp->bus_address = info->address;
1340                         pnp->type.bus_address = 1;
1341                 }
1342                 if (info->valid & ACPI_VALID_UID)
1343                         pnp->unique_id = kstrdup(info->unique_id.string,
1344                                                         GFP_KERNEL);
1345                 if (info->valid & ACPI_VALID_CLS)
1346                         acpi_add_id(pnp, info->class_code.string);
1347
1348                 kfree(info);
1349
1350                 /*
1351                  * Some devices don't reliably have _HIDs & _CIDs, so add
1352                  * synthetic HIDs to make sure drivers can find them.
1353                  */
1354                 if (acpi_is_video_device(handle))
1355                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1356                 else if (acpi_bay_match(handle))
1357                         acpi_add_id(pnp, ACPI_BAY_HID);
1358                 else if (acpi_dock_match(handle))
1359                         acpi_add_id(pnp, ACPI_DOCK_HID);
1360                 else if (acpi_ibm_smbus_match(handle))
1361                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1362                 else if (list_empty(&pnp->ids) &&
1363                          acpi_object_is_system_bus(handle)) {
1364                         /* \_SB, \_TZ, LNXSYBUS */
1365                         acpi_add_id(pnp, ACPI_BUS_HID);
1366                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1367                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1368                 }
1369
1370                 break;
1371         case ACPI_BUS_TYPE_POWER:
1372                 acpi_add_id(pnp, ACPI_POWER_HID);
1373                 break;
1374         case ACPI_BUS_TYPE_PROCESSOR:
1375                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1376                 break;
1377         case ACPI_BUS_TYPE_THERMAL:
1378                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1379                 break;
1380         case ACPI_BUS_TYPE_POWER_BUTTON:
1381                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1382                 break;
1383         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1384                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1385                 break;
1386         case ACPI_BUS_TYPE_ECDT_EC:
1387                 acpi_add_id(pnp, ACPI_ECDT_HID);
1388                 break;
1389         }
1390 }
1391
1392 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1393 {
1394         struct acpi_hardware_id *id, *tmp;
1395
1396         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1397                 kfree_const(id->id);
1398                 kfree(id);
1399         }
1400         kfree(pnp->unique_id);
1401 }
1402
1403 /**
1404  * acpi_dma_supported - Check DMA support for the specified device.
1405  * @adev: The pointer to acpi device
1406  *
1407  * Return false if DMA is not supported. Otherwise, return true
1408  */
1409 bool acpi_dma_supported(struct acpi_device *adev)
1410 {
1411         if (!adev)
1412                 return false;
1413
1414         if (adev->flags.cca_seen)
1415                 return true;
1416
1417         /*
1418         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1419         * DMA on "Intel platforms".  Presumably that includes all x86 and
1420         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1421         */
1422         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1423                 return true;
1424
1425         return false;
1426 }
1427
1428 /**
1429  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1430  * @adev: The pointer to acpi device
1431  *
1432  * Return enum dev_dma_attr.
1433  */
1434 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1435 {
1436         if (!acpi_dma_supported(adev))
1437                 return DEV_DMA_NOT_SUPPORTED;
1438
1439         if (adev->flags.coherent_dma)
1440                 return DEV_DMA_COHERENT;
1441         else
1442                 return DEV_DMA_NON_COHERENT;
1443 }
1444
1445 /**
1446  * acpi_dma_get_range() - Get device DMA parameters.
1447  *
1448  * @dev: device to configure
1449  * @dma_addr: pointer device DMA address result
1450  * @offset: pointer to the DMA offset result
1451  * @size: pointer to DMA range size result
1452  *
1453  * Evaluate DMA regions and return respectively DMA region start, offset
1454  * and size in dma_addr, offset and size on parsing success; it does not
1455  * update the passed in values on failure.
1456  *
1457  * Return 0 on success, < 0 on failure.
1458  */
1459 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1460                        u64 *size)
1461 {
1462         struct acpi_device *adev;
1463         LIST_HEAD(list);
1464         struct resource_entry *rentry;
1465         int ret;
1466         struct device *dma_dev = dev;
1467         u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1468
1469         /*
1470          * Walk the device tree chasing an ACPI companion with a _DMA
1471          * object while we go. Stop if we find a device with an ACPI
1472          * companion containing a _DMA method.
1473          */
1474         do {
1475                 adev = ACPI_COMPANION(dma_dev);
1476                 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1477                         break;
1478
1479                 dma_dev = dma_dev->parent;
1480         } while (dma_dev);
1481
1482         if (!dma_dev)
1483                 return -ENODEV;
1484
1485         if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1486                 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1487                 return -EINVAL;
1488         }
1489
1490         ret = acpi_dev_get_dma_resources(adev, &list);
1491         if (ret > 0) {
1492                 list_for_each_entry(rentry, &list, node) {
1493                         if (dma_offset && rentry->offset != dma_offset) {
1494                                 ret = -EINVAL;
1495                                 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1496                                 goto out;
1497                         }
1498                         dma_offset = rentry->offset;
1499
1500                         /* Take lower and upper limits */
1501                         if (rentry->res->start < dma_start)
1502                                 dma_start = rentry->res->start;
1503                         if (rentry->res->end > dma_end)
1504                                 dma_end = rentry->res->end;
1505                 }
1506
1507                 if (dma_start >= dma_end) {
1508                         ret = -EINVAL;
1509                         dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1510                         goto out;
1511                 }
1512
1513                 *dma_addr = dma_start - dma_offset;
1514                 len = dma_end - dma_start;
1515                 *size = max(len, len + 1);
1516                 *offset = dma_offset;
1517         }
1518  out:
1519         acpi_dev_free_resource_list(&list);
1520
1521         return ret >= 0 ? 0 : ret;
1522 }
1523
1524 /**
1525  * acpi_dma_configure_id - Set-up DMA configuration for the device.
1526  * @dev: The pointer to the device
1527  * @attr: device dma attributes
1528  * @input_id: input device id const value pointer
1529  */
1530 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1531                           const u32 *input_id)
1532 {
1533         const struct iommu_ops *iommu;
1534         u64 dma_addr = 0, size = 0;
1535
1536         if (attr == DEV_DMA_NOT_SUPPORTED) {
1537                 set_dma_ops(dev, &dma_dummy_ops);
1538                 return 0;
1539         }
1540
1541         iort_dma_setup(dev, &dma_addr, &size);
1542
1543         iommu = iort_iommu_configure_id(dev, input_id);
1544         if (PTR_ERR(iommu) == -EPROBE_DEFER)
1545                 return -EPROBE_DEFER;
1546
1547         arch_setup_dma_ops(dev, dma_addr, size,
1548                                 iommu, attr == DEV_DMA_COHERENT);
1549
1550         return 0;
1551 }
1552 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1553
1554 static void acpi_init_coherency(struct acpi_device *adev)
1555 {
1556         unsigned long long cca = 0;
1557         acpi_status status;
1558         struct acpi_device *parent = adev->parent;
1559
1560         if (parent && parent->flags.cca_seen) {
1561                 /*
1562                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1563                  * already saw one.
1564                  */
1565                 adev->flags.cca_seen = 1;
1566                 cca = parent->flags.coherent_dma;
1567         } else {
1568                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1569                                                NULL, &cca);
1570                 if (ACPI_SUCCESS(status))
1571                         adev->flags.cca_seen = 1;
1572                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1573                         /*
1574                          * If architecture does not specify that _CCA is
1575                          * required for DMA-able devices (e.g. x86),
1576                          * we default to _CCA=1.
1577                          */
1578                         cca = 1;
1579                 else
1580                         acpi_handle_debug(adev->handle,
1581                                           "ACPI device is missing _CCA.\n");
1582         }
1583
1584         adev->flags.coherent_dma = cca;
1585 }
1586
1587 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1588 {
1589         bool *is_serial_bus_slave_p = data;
1590
1591         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1592                 return 1;
1593
1594         *is_serial_bus_slave_p = true;
1595
1596          /* no need to do more checking */
1597         return -1;
1598 }
1599
1600 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1601 {
1602         struct acpi_device *parent = device->parent;
1603         static const struct acpi_device_id indirect_io_hosts[] = {
1604                 {"HISI0191", 0},
1605                 {}
1606         };
1607
1608         return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1609 }
1610
1611 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1612 {
1613         struct list_head resource_list;
1614         bool is_serial_bus_slave = false;
1615         /*
1616          * These devices have multiple I2cSerialBus resources and an i2c-client
1617          * must be instantiated for each, each with its own i2c_device_id.
1618          * Normally we only instantiate an i2c-client for the first resource,
1619          * using the ACPI HID as id. These special cases are handled by the
1620          * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
1621          * which i2c_device_id to use for each resource.
1622          */
1623         static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
1624                 {"BSG1160", },
1625                 {"BSG2150", },
1626                 {"INT33FE", },
1627                 {"INT3515", },
1628                 {}
1629         };
1630
1631         if (acpi_is_indirect_io_slave(device))
1632                 return true;
1633
1634         /* Macs use device properties in lieu of _CRS resources */
1635         if (x86_apple_machine &&
1636             (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1637              fwnode_property_present(&device->fwnode, "i2cAddress") ||
1638              fwnode_property_present(&device->fwnode, "baud")))
1639                 return true;
1640
1641         /* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
1642         if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
1643                 return false;
1644
1645         INIT_LIST_HEAD(&resource_list);
1646         acpi_dev_get_resources(device, &resource_list,
1647                                acpi_check_serial_bus_slave,
1648                                &is_serial_bus_slave);
1649         acpi_dev_free_resource_list(&resource_list);
1650
1651         return is_serial_bus_slave;
1652 }
1653
1654 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1655                              int type)
1656 {
1657         INIT_LIST_HEAD(&device->pnp.ids);
1658         device->device_type = type;
1659         device->handle = handle;
1660         device->parent = acpi_bus_get_parent(handle);
1661         fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1662         acpi_set_device_status(device, ACPI_STA_DEFAULT);
1663         acpi_device_get_busid(device);
1664         acpi_set_pnp_ids(handle, &device->pnp, type);
1665         acpi_init_properties(device);
1666         acpi_bus_get_flags(device);
1667         device->flags.match_driver = false;
1668         device->flags.initialized = true;
1669         device->flags.enumeration_by_parent =
1670                 acpi_device_enumeration_by_parent(device);
1671         acpi_device_clear_enumerated(device);
1672         device_initialize(&device->dev);
1673         dev_set_uevent_suppress(&device->dev, true);
1674         acpi_init_coherency(device);
1675         /* Assume there are unmet deps to start with. */
1676         device->dep_unmet = 1;
1677 }
1678
1679 void acpi_device_add_finalize(struct acpi_device *device)
1680 {
1681         dev_set_uevent_suppress(&device->dev, false);
1682         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1683 }
1684
1685 static void acpi_scan_init_status(struct acpi_device *adev)
1686 {
1687         if (acpi_bus_get_status(adev))
1688                 acpi_set_device_status(adev, 0);
1689 }
1690
1691 static int acpi_add_single_object(struct acpi_device **child,
1692                                   acpi_handle handle, int type)
1693 {
1694         struct acpi_device *device;
1695         int result;
1696
1697         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1698         if (!device)
1699                 return -ENOMEM;
1700
1701         acpi_init_device_object(device, handle, type);
1702         /*
1703          * Getting the status is delayed till here so that we can call
1704          * acpi_bus_get_status() and use its quirk handling.  Note that
1705          * this must be done before the get power-/wakeup_dev-flags calls.
1706          */
1707         if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR)
1708                 acpi_scan_init_status(device);
1709
1710         acpi_bus_get_power_flags(device);
1711         acpi_bus_get_wakeup_device_flags(device);
1712
1713         result = acpi_device_add(device, acpi_device_release);
1714         if (result) {
1715                 acpi_device_release(&device->dev);
1716                 return result;
1717         }
1718
1719         acpi_power_add_remove_device(device, true);
1720         acpi_device_add_finalize(device);
1721
1722         acpi_handle_debug(handle, "Added as %s, parent %s\n",
1723                           dev_name(&device->dev), device->parent ?
1724                                 dev_name(&device->parent->dev) : "(null)");
1725
1726         *child = device;
1727         return 0;
1728 }
1729
1730 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1731                                             void *context)
1732 {
1733         struct resource *res = context;
1734
1735         if (acpi_dev_resource_memory(ares, res))
1736                 return AE_CTRL_TERMINATE;
1737
1738         return AE_OK;
1739 }
1740
1741 static bool acpi_device_should_be_hidden(acpi_handle handle)
1742 {
1743         acpi_status status;
1744         struct resource res;
1745
1746         /* Check if it should ignore the UART device */
1747         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1748                 return false;
1749
1750         /*
1751          * The UART device described in SPCR table is assumed to have only one
1752          * memory resource present. So we only look for the first one here.
1753          */
1754         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1755                                      acpi_get_resource_memory, &res);
1756         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1757                 return false;
1758
1759         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1760                          &res.start);
1761
1762         return true;
1763 }
1764
1765 bool acpi_device_is_present(const struct acpi_device *adev)
1766 {
1767         return adev->status.present || adev->status.functional;
1768 }
1769
1770 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1771                                        const char *idstr,
1772                                        const struct acpi_device_id **matchid)
1773 {
1774         const struct acpi_device_id *devid;
1775
1776         if (handler->match)
1777                 return handler->match(idstr, matchid);
1778
1779         for (devid = handler->ids; devid->id[0]; devid++)
1780                 if (!strcmp((char *)devid->id, idstr)) {
1781                         if (matchid)
1782                                 *matchid = devid;
1783
1784                         return true;
1785                 }
1786
1787         return false;
1788 }
1789
1790 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1791                                         const struct acpi_device_id **matchid)
1792 {
1793         struct acpi_scan_handler *handler;
1794
1795         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1796                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1797                         return handler;
1798
1799         return NULL;
1800 }
1801
1802 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1803 {
1804         if (!!hotplug->enabled == !!val)
1805                 return;
1806
1807         mutex_lock(&acpi_scan_lock);
1808
1809         hotplug->enabled = val;
1810
1811         mutex_unlock(&acpi_scan_lock);
1812 }
1813
1814 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1815 {
1816         struct acpi_hardware_id *hwid;
1817
1818         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1819                 acpi_dock_add(adev);
1820                 return;
1821         }
1822         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1823                 struct acpi_scan_handler *handler;
1824
1825                 handler = acpi_scan_match_handler(hwid->id, NULL);
1826                 if (handler) {
1827                         adev->flags.hotplug_notify = true;
1828                         break;
1829                 }
1830         }
1831 }
1832
1833 static u32 acpi_scan_check_dep(acpi_handle handle, bool check_dep)
1834 {
1835         struct acpi_handle_list dep_devices;
1836         acpi_status status;
1837         u32 count;
1838         int i;
1839
1840         /*
1841          * Check for _HID here to avoid deferring the enumeration of:
1842          * 1. PCI devices.
1843          * 2. ACPI nodes describing USB ports.
1844          * Still, checking for _HID catches more then just these cases ...
1845          */
1846         if (!check_dep || !acpi_has_method(handle, "_DEP") ||
1847             !acpi_has_method(handle, "_HID"))
1848                 return 0;
1849
1850         status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices);
1851         if (ACPI_FAILURE(status)) {
1852                 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
1853                 return 0;
1854         }
1855
1856         for (count = 0, i = 0; i < dep_devices.count; i++) {
1857                 struct acpi_device_info *info;
1858                 struct acpi_dep_data *dep;
1859                 bool skip;
1860
1861                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1862                 if (ACPI_FAILURE(status)) {
1863                         acpi_handle_debug(handle, "Error reading _DEP device info\n");
1864                         continue;
1865                 }
1866
1867                 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
1868                 kfree(info);
1869
1870                 if (skip)
1871                         continue;
1872
1873                 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1874                 if (!dep)
1875                         continue;
1876
1877                 count++;
1878
1879                 dep->supplier = dep_devices.handles[i];
1880                 dep->consumer = handle;
1881
1882                 mutex_lock(&acpi_dep_list_lock);
1883                 list_add_tail(&dep->node , &acpi_dep_list);
1884                 mutex_unlock(&acpi_dep_list_lock);
1885         }
1886
1887         return count;
1888 }
1889
1890 static void acpi_scan_dep_init(struct acpi_device *adev)
1891 {
1892         struct acpi_dep_data *dep;
1893
1894         adev->dep_unmet = 0;
1895
1896         mutex_lock(&acpi_dep_list_lock);
1897
1898         list_for_each_entry(dep, &acpi_dep_list, node) {
1899                 if (dep->consumer == adev->handle)
1900                         adev->dep_unmet++;
1901         }
1902
1903         mutex_unlock(&acpi_dep_list_lock);
1904 }
1905
1906 static bool acpi_bus_scan_second_pass;
1907
1908 static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep,
1909                                       struct acpi_device **adev_p)
1910 {
1911         struct acpi_device *device = NULL;
1912         acpi_object_type acpi_type;
1913         int type;
1914
1915         acpi_bus_get_device(handle, &device);
1916         if (device)
1917                 goto out;
1918
1919         if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
1920                 return AE_OK;
1921
1922         switch (acpi_type) {
1923         case ACPI_TYPE_DEVICE:
1924                 if (acpi_device_should_be_hidden(handle))
1925                         return AE_OK;
1926
1927                 /* Bail out if there are dependencies. */
1928                 if (acpi_scan_check_dep(handle, check_dep) > 0) {
1929                         acpi_bus_scan_second_pass = true;
1930                         return AE_CTRL_DEPTH;
1931                 }
1932
1933                 fallthrough;
1934         case ACPI_TYPE_ANY:     /* for ACPI_ROOT_OBJECT */
1935                 type = ACPI_BUS_TYPE_DEVICE;
1936                 break;
1937
1938         case ACPI_TYPE_PROCESSOR:
1939                 type = ACPI_BUS_TYPE_PROCESSOR;
1940                 break;
1941
1942         case ACPI_TYPE_THERMAL:
1943                 type = ACPI_BUS_TYPE_THERMAL;
1944                 break;
1945
1946         case ACPI_TYPE_POWER:
1947                 acpi_add_power_resource(handle);
1948                 fallthrough;
1949         default:
1950                 return AE_OK;
1951         }
1952
1953         acpi_add_single_object(&device, handle, type);
1954         if (!device)
1955                 return AE_CTRL_DEPTH;
1956
1957         acpi_scan_init_hotplug(device);
1958         /*
1959          * If check_dep is true at this point, the device has no dependencies,
1960          * or the creation of the device object would have been postponed above.
1961          */
1962         if (check_dep)
1963                 device->dep_unmet = 0;
1964         else
1965                 acpi_scan_dep_init(device);
1966
1967 out:
1968         if (!*adev_p)
1969                 *adev_p = device;
1970
1971         return AE_OK;
1972 }
1973
1974 static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
1975                                         void *not_used, void **ret_p)
1976 {
1977         return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
1978 }
1979
1980 static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
1981                                         void *not_used, void **ret_p)
1982 {
1983         return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
1984 }
1985
1986 static void acpi_default_enumeration(struct acpi_device *device)
1987 {
1988         /*
1989          * Do not enumerate devices with enumeration_by_parent flag set as
1990          * they will be enumerated by their respective parents.
1991          */
1992         if (!device->flags.enumeration_by_parent) {
1993                 acpi_create_platform_device(device, NULL);
1994                 acpi_device_set_enumerated(device);
1995         } else {
1996                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1997                                              ACPI_RECONFIG_DEVICE_ADD, device);
1998         }
1999 }
2000
2001 static const struct acpi_device_id generic_device_ids[] = {
2002         {ACPI_DT_NAMESPACE_HID, },
2003         {"", },
2004 };
2005
2006 static int acpi_generic_device_attach(struct acpi_device *adev,
2007                                       const struct acpi_device_id *not_used)
2008 {
2009         /*
2010          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2011          * below can be unconditional.
2012          */
2013         if (adev->data.of_compatible)
2014                 acpi_default_enumeration(adev);
2015
2016         return 1;
2017 }
2018
2019 static struct acpi_scan_handler generic_device_handler = {
2020         .ids = generic_device_ids,
2021         .attach = acpi_generic_device_attach,
2022 };
2023
2024 static int acpi_scan_attach_handler(struct acpi_device *device)
2025 {
2026         struct acpi_hardware_id *hwid;
2027         int ret = 0;
2028
2029         list_for_each_entry(hwid, &device->pnp.ids, list) {
2030                 const struct acpi_device_id *devid;
2031                 struct acpi_scan_handler *handler;
2032
2033                 handler = acpi_scan_match_handler(hwid->id, &devid);
2034                 if (handler) {
2035                         if (!handler->attach) {
2036                                 device->pnp.type.platform_id = 0;
2037                                 continue;
2038                         }
2039                         device->handler = handler;
2040                         ret = handler->attach(device, devid);
2041                         if (ret > 0)
2042                                 break;
2043
2044                         device->handler = NULL;
2045                         if (ret < 0)
2046                                 break;
2047                 }
2048         }
2049
2050         return ret;
2051 }
2052
2053 static void acpi_bus_attach(struct acpi_device *device, bool first_pass)
2054 {
2055         struct acpi_device *child;
2056         bool skip = !first_pass && device->flags.visited;
2057         acpi_handle ejd;
2058         int ret;
2059
2060         if (skip)
2061                 goto ok;
2062
2063         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2064                 register_dock_dependent_device(device, ejd);
2065
2066         acpi_bus_get_status(device);
2067         /* Skip devices that are not present. */
2068         if (!acpi_device_is_present(device)) {
2069                 device->flags.initialized = false;
2070                 acpi_device_clear_enumerated(device);
2071                 device->flags.power_manageable = 0;
2072                 return;
2073         }
2074         if (device->handler)
2075                 goto ok;
2076
2077         if (!device->flags.initialized) {
2078                 device->flags.power_manageable =
2079                         device->power.states[ACPI_STATE_D0].flags.valid;
2080                 if (acpi_bus_init_power(device))
2081                         device->flags.power_manageable = 0;
2082
2083                 device->flags.initialized = true;
2084         } else if (device->flags.visited) {
2085                 goto ok;
2086         }
2087
2088         ret = acpi_scan_attach_handler(device);
2089         if (ret < 0)
2090                 return;
2091
2092         device->flags.match_driver = true;
2093         if (ret > 0 && !device->flags.enumeration_by_parent) {
2094                 acpi_device_set_enumerated(device);
2095                 goto ok;
2096         }
2097
2098         ret = device_attach(&device->dev);
2099         if (ret < 0)
2100                 return;
2101
2102         if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2103                 acpi_default_enumeration(device);
2104         else
2105                 acpi_device_set_enumerated(device);
2106
2107  ok:
2108         list_for_each_entry(child, &device->children, node)
2109                 acpi_bus_attach(child, first_pass);
2110
2111         if (!skip && device->handler && device->handler->hotplug.notify_online)
2112                 device->handler->hotplug.notify_online(device);
2113 }
2114
2115 void acpi_walk_dep_device_list(acpi_handle handle)
2116 {
2117         struct acpi_dep_data *dep, *tmp;
2118         struct acpi_device *adev;
2119
2120         mutex_lock(&acpi_dep_list_lock);
2121         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2122                 if (dep->supplier == handle) {
2123                         acpi_bus_get_device(dep->consumer, &adev);
2124
2125                         if (adev) {
2126                                 adev->dep_unmet--;
2127                                 if (!adev->dep_unmet)
2128                                         acpi_bus_attach(adev, true);
2129                         }
2130
2131                         list_del(&dep->node);
2132                         kfree(dep);
2133                 }
2134         }
2135         mutex_unlock(&acpi_dep_list_lock);
2136 }
2137 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2138
2139 /**
2140  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2141  * @handle: Root of the namespace scope to scan.
2142  *
2143  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2144  * found devices.
2145  *
2146  * If no devices were found, -ENODEV is returned, but it does not mean that
2147  * there has been a real error.  There just have been no suitable ACPI objects
2148  * in the table trunk from which the kernel could create a device and add an
2149  * appropriate driver.
2150  *
2151  * Must be called under acpi_scan_lock.
2152  */
2153 int acpi_bus_scan(acpi_handle handle)
2154 {
2155         struct acpi_device *device = NULL;
2156
2157         acpi_bus_scan_second_pass = false;
2158
2159         /* Pass 1: Avoid enumerating devices with missing dependencies. */
2160
2161         if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2162                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2163                                     acpi_bus_check_add_1, NULL, NULL,
2164                                     (void **)&device);
2165
2166         if (!device)
2167                 return -ENODEV;
2168
2169         acpi_bus_attach(device, true);
2170
2171         if (!acpi_bus_scan_second_pass)
2172                 return 0;
2173
2174         /* Pass 2: Enumerate all of the remaining devices. */
2175
2176         device = NULL;
2177
2178         if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device)))
2179                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2180                                     acpi_bus_check_add_2, NULL, NULL,
2181                                     (void **)&device);
2182
2183         acpi_bus_attach(device, false);
2184
2185         return 0;
2186 }
2187 EXPORT_SYMBOL(acpi_bus_scan);
2188
2189 /**
2190  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2191  * @adev: Root of the ACPI namespace scope to walk.
2192  *
2193  * Must be called under acpi_scan_lock.
2194  */
2195 void acpi_bus_trim(struct acpi_device *adev)
2196 {
2197         struct acpi_scan_handler *handler = adev->handler;
2198         struct acpi_device *child;
2199
2200         list_for_each_entry_reverse(child, &adev->children, node)
2201                 acpi_bus_trim(child);
2202
2203         adev->flags.match_driver = false;
2204         if (handler) {
2205                 if (handler->detach)
2206                         handler->detach(adev);
2207
2208                 adev->handler = NULL;
2209         } else {
2210                 device_release_driver(&adev->dev);
2211         }
2212         /*
2213          * Most likely, the device is going away, so put it into D3cold before
2214          * that.
2215          */
2216         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2217         adev->flags.initialized = false;
2218         acpi_device_clear_enumerated(adev);
2219 }
2220 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2221
2222 int acpi_bus_register_early_device(int type)
2223 {
2224         struct acpi_device *device = NULL;
2225         int result;
2226
2227         result = acpi_add_single_object(&device, NULL, type);
2228         if (result)
2229                 return result;
2230
2231         device->flags.match_driver = true;
2232         return device_attach(&device->dev);
2233 }
2234 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2235
2236 static int acpi_bus_scan_fixed(void)
2237 {
2238         int result = 0;
2239
2240         /*
2241          * Enumerate all fixed-feature devices.
2242          */
2243         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2244                 struct acpi_device *device = NULL;
2245
2246                 result = acpi_add_single_object(&device, NULL,
2247                                                 ACPI_BUS_TYPE_POWER_BUTTON);
2248                 if (result)
2249                         return result;
2250
2251                 device->flags.match_driver = true;
2252                 result = device_attach(&device->dev);
2253                 if (result < 0)
2254                         return result;
2255
2256                 device_init_wakeup(&device->dev, true);
2257         }
2258
2259         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2260                 struct acpi_device *device = NULL;
2261
2262                 result = acpi_add_single_object(&device, NULL,
2263                                                 ACPI_BUS_TYPE_SLEEP_BUTTON);
2264                 if (result)
2265                         return result;
2266
2267                 device->flags.match_driver = true;
2268                 result = device_attach(&device->dev);
2269         }
2270
2271         return result < 0 ? result : 0;
2272 }
2273
2274 static void __init acpi_get_spcr_uart_addr(void)
2275 {
2276         acpi_status status;
2277         struct acpi_table_spcr *spcr_ptr;
2278
2279         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2280                                 (struct acpi_table_header **)&spcr_ptr);
2281         if (ACPI_FAILURE(status)) {
2282                 pr_warn("STAO table present, but SPCR is missing\n");
2283                 return;
2284         }
2285
2286         spcr_uart_addr = spcr_ptr->serial_port.address;
2287         acpi_put_table((struct acpi_table_header *)spcr_ptr);
2288 }
2289
2290 static bool acpi_scan_initialized;
2291
2292 int __init acpi_scan_init(void)
2293 {
2294         int result;
2295         acpi_status status;
2296         struct acpi_table_stao *stao_ptr;
2297
2298         acpi_pci_root_init();
2299         acpi_pci_link_init();
2300         acpi_processor_init();
2301         acpi_platform_init();
2302         acpi_lpss_init();
2303         acpi_apd_init();
2304         acpi_cmos_rtc_init();
2305         acpi_container_init();
2306         acpi_memory_hotplug_init();
2307         acpi_watchdog_init();
2308         acpi_pnp_init();
2309         acpi_int340x_thermal_init();
2310         acpi_amba_init();
2311         acpi_init_lpit();
2312
2313         acpi_scan_add_handler(&generic_device_handler);
2314
2315         /*
2316          * If there is STAO table, check whether it needs to ignore the UART
2317          * device in SPCR table.
2318          */
2319         status = acpi_get_table(ACPI_SIG_STAO, 0,
2320                                 (struct acpi_table_header **)&stao_ptr);
2321         if (ACPI_SUCCESS(status)) {
2322                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2323                         pr_info("STAO Name List not yet supported.\n");
2324
2325                 if (stao_ptr->ignore_uart)
2326                         acpi_get_spcr_uart_addr();
2327
2328                 acpi_put_table((struct acpi_table_header *)stao_ptr);
2329         }
2330
2331         acpi_gpe_apply_masked_gpes();
2332         acpi_update_all_gpes();
2333
2334         /*
2335          * Although we call __add_memory() that is documented to require the
2336          * device_hotplug_lock, it is not necessary here because this is an
2337          * early code when userspace or any other code path cannot trigger
2338          * hotplug/hotunplug operations.
2339          */
2340         mutex_lock(&acpi_scan_lock);
2341         /*
2342          * Enumerate devices in the ACPI namespace.
2343          */
2344         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2345         if (result)
2346                 goto out;
2347
2348         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2349         if (result)
2350                 goto out;
2351
2352         /* Fixed feature devices do not exist on HW-reduced platform */
2353         if (!acpi_gbl_reduced_hardware) {
2354                 result = acpi_bus_scan_fixed();
2355                 if (result) {
2356                         acpi_detach_data(acpi_root->handle,
2357                                          acpi_scan_drop_device);
2358                         acpi_device_del(acpi_root);
2359                         acpi_bus_put_acpi_device(acpi_root);
2360                         goto out;
2361                 }
2362         }
2363
2364         acpi_turn_off_unused_power_resources(true);
2365
2366         acpi_scan_initialized = true;
2367
2368  out:
2369         mutex_unlock(&acpi_scan_lock);
2370         return result;
2371 }
2372
2373 static struct acpi_probe_entry *ape;
2374 static int acpi_probe_count;
2375 static DEFINE_MUTEX(acpi_probe_mutex);
2376
2377 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2378                                   const unsigned long end)
2379 {
2380         if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2381                 if (!ape->probe_subtbl(header, end))
2382                         acpi_probe_count++;
2383
2384         return 0;
2385 }
2386
2387 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2388 {
2389         int count = 0;
2390
2391         if (acpi_disabled)
2392                 return 0;
2393
2394         mutex_lock(&acpi_probe_mutex);
2395         for (ape = ap_head; nr; ape++, nr--) {
2396                 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2397                         acpi_probe_count = 0;
2398                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2399                         count += acpi_probe_count;
2400                 } else {
2401                         int res;
2402                         res = acpi_table_parse(ape->id, ape->probe_table);
2403                         if (!res)
2404                                 count++;
2405                 }
2406         }
2407         mutex_unlock(&acpi_probe_mutex);
2408
2409         return count;
2410 }
2411
2412 struct acpi_table_events_work {
2413         struct work_struct work;
2414         void *table;
2415         u32 event;
2416 };
2417
2418 static void acpi_table_events_fn(struct work_struct *work)
2419 {
2420         struct acpi_table_events_work *tew;
2421
2422         tew = container_of(work, struct acpi_table_events_work, work);
2423
2424         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2425                 acpi_scan_lock_acquire();
2426                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2427                 acpi_scan_lock_release();
2428         }
2429
2430         kfree(tew);
2431 }
2432
2433 void acpi_scan_table_handler(u32 event, void *table, void *context)
2434 {
2435         struct acpi_table_events_work *tew;
2436
2437         if (!acpi_scan_initialized)
2438                 return;
2439
2440         if (event != ACPI_TABLE_EVENT_LOAD)
2441                 return;
2442
2443         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2444         if (!tew)
2445                 return;
2446
2447         INIT_WORK(&tew->work, acpi_table_events_fn);
2448         tew->table = table;
2449         tew->event = event;
2450
2451         schedule_work(&tew->work);
2452 }
2453
2454 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2455 {
2456         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2457 }
2458 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2459
2460 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2461 {
2462         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2463 }
2464 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);