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