1 /* 2 * scan.c - support for transforming the ACPI namespace into individual objects 3 */ 4 5 #include <linux/module.h> 6 #include <linux/init.h> 7 #include <linux/slab.h> 8 #include <linux/kernel.h> 9 #include <linux/acpi.h> 10 #include <linux/acpi_iort.h> 11 #include <linux/signal.h> 12 #include <linux/kthread.h> 13 #include <linux/dmi.h> 14 #include <linux/nls.h> 15 #include <linux/dma-mapping.h> 16 17 #include <asm/pgtable.h> 18 19 #include "internal.h" 20 21 #define _COMPONENT ACPI_BUS_COMPONENT 22 ACPI_MODULE_NAME("scan"); 23 extern struct acpi_device *acpi_root; 24 25 #define ACPI_BUS_CLASS "system_bus" 26 #define ACPI_BUS_HID "LNXSYBUS" 27 #define ACPI_BUS_DEVICE_NAME "System Bus" 28 29 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) 30 31 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page) 32 33 static const char *dummy_hid = "device"; 34 35 static LIST_HEAD(acpi_dep_list); 36 static DEFINE_MUTEX(acpi_dep_list_lock); 37 LIST_HEAD(acpi_bus_id_list); 38 static DEFINE_MUTEX(acpi_scan_lock); 39 static LIST_HEAD(acpi_scan_handlers_list); 40 DEFINE_MUTEX(acpi_device_lock); 41 LIST_HEAD(acpi_wakeup_device_list); 42 static DEFINE_MUTEX(acpi_hp_context_lock); 43 44 /* 45 * The UART device described by the SPCR table is the only object which needs 46 * special-casing. Everything else is covered by ACPI namespace paths in STAO 47 * table. 48 */ 49 static u64 spcr_uart_addr; 50 51 struct acpi_dep_data { 52 struct list_head node; 53 acpi_handle master; 54 acpi_handle slave; 55 }; 56 57 void acpi_scan_lock_acquire(void) 58 { 59 mutex_lock(&acpi_scan_lock); 60 } 61 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); 62 63 void acpi_scan_lock_release(void) 64 { 65 mutex_unlock(&acpi_scan_lock); 66 } 67 EXPORT_SYMBOL_GPL(acpi_scan_lock_release); 68 69 void acpi_lock_hp_context(void) 70 { 71 mutex_lock(&acpi_hp_context_lock); 72 } 73 74 void acpi_unlock_hp_context(void) 75 { 76 mutex_unlock(&acpi_hp_context_lock); 77 } 78 79 void acpi_initialize_hp_context(struct acpi_device *adev, 80 struct acpi_hotplug_context *hp, 81 int (*notify)(struct acpi_device *, u32), 82 void (*uevent)(struct acpi_device *, u32)) 83 { 84 acpi_lock_hp_context(); 85 hp->notify = notify; 86 hp->uevent = uevent; 87 acpi_set_hp_context(adev, hp); 88 acpi_unlock_hp_context(); 89 } 90 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context); 91 92 int acpi_scan_add_handler(struct acpi_scan_handler *handler) 93 { 94 if (!handler) 95 return -EINVAL; 96 97 list_add_tail(&handler->list_node, &acpi_scan_handlers_list); 98 return 0; 99 } 100 101 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, 102 const char *hotplug_profile_name) 103 { 104 int error; 105 106 error = acpi_scan_add_handler(handler); 107 if (error) 108 return error; 109 110 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); 111 return 0; 112 } 113 114 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) 115 { 116 struct acpi_device_physical_node *pn; 117 bool offline = true; 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(&pn->dev->kobj, KOBJ_CHANGE); 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_DEBUG_PRINT((ACPI_DB_INFO, 267 "Hot-removing device %s...\n", dev_name(&device->dev))); 268 269 acpi_bus_trim(device); 270 271 acpi_evaluate_lck(handle, 0); 272 /* 273 * TBD: _EJD support. 274 */ 275 status = acpi_evaluate_ej0(handle); 276 if (status == AE_NOT_FOUND) 277 return -ENODEV; 278 else if (ACPI_FAILURE(status)) 279 return -EIO; 280 281 /* 282 * Verify if eject was indeed successful. If not, log an error 283 * message. No need to call _OST since _EJ0 call was made OK. 284 */ 285 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 286 if (ACPI_FAILURE(status)) { 287 acpi_handle_warn(handle, 288 "Status check after eject failed (0x%x)\n", status); 289 } else if (sta & ACPI_STA_DEVICE_ENABLED) { 290 acpi_handle_warn(handle, 291 "Eject incomplete - status 0x%llx\n", sta); 292 } 293 294 return 0; 295 } 296 297 static int acpi_scan_device_not_present(struct acpi_device *adev) 298 { 299 if (!acpi_device_enumerated(adev)) { 300 dev_warn(&adev->dev, "Still not present\n"); 301 return -EALREADY; 302 } 303 acpi_bus_trim(adev); 304 return 0; 305 } 306 307 static int acpi_scan_device_check(struct acpi_device *adev) 308 { 309 int error; 310 311 acpi_bus_get_status(adev); 312 if (adev->status.present || adev->status.functional) { 313 /* 314 * This function is only called for device objects for which 315 * matching scan handlers exist. The only situation in which 316 * the scan handler is not attached to this device object yet 317 * is when the device has just appeared (either it wasn't 318 * present at all before or it was removed and then added 319 * again). 320 */ 321 if (adev->handler) { 322 dev_warn(&adev->dev, "Already enumerated\n"); 323 return -EALREADY; 324 } 325 error = acpi_bus_scan(adev->handle); 326 if (error) { 327 dev_warn(&adev->dev, "Namespace scan failure\n"); 328 return error; 329 } 330 if (!adev->handler) { 331 dev_warn(&adev->dev, "Enumeration failure\n"); 332 error = -ENODEV; 333 } 334 } else { 335 error = acpi_scan_device_not_present(adev); 336 } 337 return error; 338 } 339 340 static int acpi_scan_bus_check(struct acpi_device *adev) 341 { 342 struct acpi_scan_handler *handler = adev->handler; 343 struct acpi_device *child; 344 int error; 345 346 acpi_bus_get_status(adev); 347 if (!(adev->status.present || adev->status.functional)) { 348 acpi_scan_device_not_present(adev); 349 return 0; 350 } 351 if (handler && handler->hotplug.scan_dependent) 352 return handler->hotplug.scan_dependent(adev); 353 354 error = acpi_bus_scan(adev->handle); 355 if (error) { 356 dev_warn(&adev->dev, "Namespace scan failure\n"); 357 return error; 358 } 359 list_for_each_entry(child, &adev->children, node) { 360 error = acpi_scan_bus_check(child); 361 if (error) 362 return error; 363 } 364 return 0; 365 } 366 367 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type) 368 { 369 switch (type) { 370 case ACPI_NOTIFY_BUS_CHECK: 371 return acpi_scan_bus_check(adev); 372 case ACPI_NOTIFY_DEVICE_CHECK: 373 return acpi_scan_device_check(adev); 374 case ACPI_NOTIFY_EJECT_REQUEST: 375 case ACPI_OST_EC_OSPM_EJECT: 376 if (adev->handler && !adev->handler->hotplug.enabled) { 377 dev_info(&adev->dev, "Eject disabled\n"); 378 return -EPERM; 379 } 380 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST, 381 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); 382 return acpi_scan_hot_remove(adev); 383 } 384 return -EINVAL; 385 } 386 387 void acpi_device_hotplug(struct acpi_device *adev, u32 src) 388 { 389 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; 390 int error = -ENODEV; 391 392 lock_device_hotplug(); 393 mutex_lock(&acpi_scan_lock); 394 395 /* 396 * The device object's ACPI handle cannot become invalid as long as we 397 * are holding acpi_scan_lock, but it might have become invalid before 398 * that lock was acquired. 399 */ 400 if (adev->handle == INVALID_ACPI_HANDLE) 401 goto err_out; 402 403 if (adev->flags.is_dock_station) { 404 error = dock_notify(adev, src); 405 } else if (adev->flags.hotplug_notify) { 406 error = acpi_generic_hotplug_event(adev, src); 407 if (error == -EPERM) { 408 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; 409 goto err_out; 410 } 411 } else { 412 int (*notify)(struct acpi_device *, u32); 413 414 acpi_lock_hp_context(); 415 notify = adev->hp ? adev->hp->notify : NULL; 416 acpi_unlock_hp_context(); 417 /* 418 * There may be additional notify handlers for device objects 419 * without the .event() callback, so ignore them here. 420 */ 421 if (notify) 422 error = notify(adev, src); 423 else 424 goto out; 425 } 426 if (!error) 427 ost_code = ACPI_OST_SC_SUCCESS; 428 429 err_out: 430 acpi_evaluate_ost(adev->handle, src, ost_code, NULL); 431 432 out: 433 acpi_bus_put_acpi_device(adev); 434 mutex_unlock(&acpi_scan_lock); 435 unlock_device_hotplug(); 436 } 437 438 static void acpi_free_power_resources_lists(struct acpi_device *device) 439 { 440 int i; 441 442 if (device->wakeup.flags.valid) 443 acpi_power_resources_list_free(&device->wakeup.resources); 444 445 if (!device->power.flags.power_resources) 446 return; 447 448 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { 449 struct acpi_device_power_state *ps = &device->power.states[i]; 450 acpi_power_resources_list_free(&ps->resources); 451 } 452 } 453 454 static void acpi_device_release(struct device *dev) 455 { 456 struct acpi_device *acpi_dev = to_acpi_device(dev); 457 458 acpi_free_properties(acpi_dev); 459 acpi_free_pnp_ids(&acpi_dev->pnp); 460 acpi_free_power_resources_lists(acpi_dev); 461 kfree(acpi_dev); 462 } 463 464 static void acpi_device_del(struct acpi_device *device) 465 { 466 struct acpi_device_bus_id *acpi_device_bus_id; 467 468 mutex_lock(&acpi_device_lock); 469 if (device->parent) 470 list_del(&device->node); 471 472 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) 473 if (!strcmp(acpi_device_bus_id->bus_id, 474 acpi_device_hid(device))) { 475 if (acpi_device_bus_id->instance_no > 0) 476 acpi_device_bus_id->instance_no--; 477 else { 478 list_del(&acpi_device_bus_id->node); 479 kfree(acpi_device_bus_id); 480 } 481 break; 482 } 483 484 list_del(&device->wakeup_list); 485 mutex_unlock(&acpi_device_lock); 486 487 acpi_power_add_remove_device(device, false); 488 acpi_device_remove_files(device); 489 if (device->remove) 490 device->remove(device); 491 492 device_del(&device->dev); 493 } 494 495 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain); 496 497 static LIST_HEAD(acpi_device_del_list); 498 static DEFINE_MUTEX(acpi_device_del_lock); 499 500 static void acpi_device_del_work_fn(struct work_struct *work_not_used) 501 { 502 for (;;) { 503 struct acpi_device *adev; 504 505 mutex_lock(&acpi_device_del_lock); 506 507 if (list_empty(&acpi_device_del_list)) { 508 mutex_unlock(&acpi_device_del_lock); 509 break; 510 } 511 adev = list_first_entry(&acpi_device_del_list, 512 struct acpi_device, del_list); 513 list_del(&adev->del_list); 514 515 mutex_unlock(&acpi_device_del_lock); 516 517 blocking_notifier_call_chain(&acpi_reconfig_chain, 518 ACPI_RECONFIG_DEVICE_REMOVE, adev); 519 520 acpi_device_del(adev); 521 /* 522 * Drop references to all power resources that might have been 523 * used by the device. 524 */ 525 acpi_power_transition(adev, ACPI_STATE_D3_COLD); 526 put_device(&adev->dev); 527 } 528 } 529 530 /** 531 * acpi_scan_drop_device - Drop an ACPI device object. 532 * @handle: Handle of an ACPI namespace node, not used. 533 * @context: Address of the ACPI device object to drop. 534 * 535 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI 536 * namespace node the device object pointed to by @context is attached to. 537 * 538 * The unregistration is carried out asynchronously to avoid running 539 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to 540 * ensure the correct ordering (the device objects must be unregistered in the 541 * same order in which the corresponding namespace nodes are deleted). 542 */ 543 static void acpi_scan_drop_device(acpi_handle handle, void *context) 544 { 545 static DECLARE_WORK(work, acpi_device_del_work_fn); 546 struct acpi_device *adev = context; 547 548 mutex_lock(&acpi_device_del_lock); 549 550 /* 551 * Use the ACPI hotplug workqueue which is ordered, so this work item 552 * won't run after any hotplug work items submitted subsequently. That 553 * prevents attempts to register device objects identical to those being 554 * deleted from happening concurrently (such attempts result from 555 * hotplug events handled via the ACPI hotplug workqueue). It also will 556 * run after all of the work items submitted previosuly, which helps 557 * those work items to ensure that they are not accessing stale device 558 * objects. 559 */ 560 if (list_empty(&acpi_device_del_list)) 561 acpi_queue_hotplug_work(&work); 562 563 list_add_tail(&adev->del_list, &acpi_device_del_list); 564 /* Make acpi_ns_validate_handle() return NULL for this handle. */ 565 adev->handle = INVALID_ACPI_HANDLE; 566 567 mutex_unlock(&acpi_device_del_lock); 568 } 569 570 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device, 571 void (*callback)(void *)) 572 { 573 acpi_status status; 574 575 if (!device) 576 return -EINVAL; 577 578 status = acpi_get_data_full(handle, acpi_scan_drop_device, 579 (void **)device, callback); 580 if (ACPI_FAILURE(status) || !*device) { 581 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", 582 handle)); 583 return -ENODEV; 584 } 585 return 0; 586 } 587 588 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) 589 { 590 return acpi_get_device_data(handle, device, NULL); 591 } 592 EXPORT_SYMBOL(acpi_bus_get_device); 593 594 static void get_acpi_device(void *dev) 595 { 596 if (dev) 597 get_device(&((struct acpi_device *)dev)->dev); 598 } 599 600 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle) 601 { 602 struct acpi_device *adev = NULL; 603 604 acpi_get_device_data(handle, &adev, get_acpi_device); 605 return adev; 606 } 607 608 void acpi_bus_put_acpi_device(struct acpi_device *adev) 609 { 610 put_device(&adev->dev); 611 } 612 613 int acpi_device_add(struct acpi_device *device, 614 void (*release)(struct device *)) 615 { 616 int result; 617 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; 618 int found = 0; 619 620 if (device->handle) { 621 acpi_status status; 622 623 status = acpi_attach_data(device->handle, acpi_scan_drop_device, 624 device); 625 if (ACPI_FAILURE(status)) { 626 acpi_handle_err(device->handle, 627 "Unable to attach device data\n"); 628 return -ENODEV; 629 } 630 } 631 632 /* 633 * Linkage 634 * ------- 635 * Link this device to its parent and siblings. 636 */ 637 INIT_LIST_HEAD(&device->children); 638 INIT_LIST_HEAD(&device->node); 639 INIT_LIST_HEAD(&device->wakeup_list); 640 INIT_LIST_HEAD(&device->physical_node_list); 641 INIT_LIST_HEAD(&device->del_list); 642 mutex_init(&device->physical_node_lock); 643 644 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); 645 if (!new_bus_id) { 646 pr_err(PREFIX "Memory allocation error\n"); 647 result = -ENOMEM; 648 goto err_detach; 649 } 650 651 mutex_lock(&acpi_device_lock); 652 /* 653 * Find suitable bus_id and instance number in acpi_bus_id_list 654 * If failed, create one and link it into acpi_bus_id_list 655 */ 656 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { 657 if (!strcmp(acpi_device_bus_id->bus_id, 658 acpi_device_hid(device))) { 659 acpi_device_bus_id->instance_no++; 660 found = 1; 661 kfree(new_bus_id); 662 break; 663 } 664 } 665 if (!found) { 666 acpi_device_bus_id = new_bus_id; 667 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); 668 acpi_device_bus_id->instance_no = 0; 669 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); 670 } 671 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); 672 673 if (device->parent) 674 list_add_tail(&device->node, &device->parent->children); 675 676 if (device->wakeup.flags.valid) 677 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); 678 mutex_unlock(&acpi_device_lock); 679 680 if (device->parent) 681 device->dev.parent = &device->parent->dev; 682 device->dev.bus = &acpi_bus_type; 683 device->dev.release = release; 684 result = device_add(&device->dev); 685 if (result) { 686 dev_err(&device->dev, "Error registering device\n"); 687 goto err; 688 } 689 690 result = acpi_device_setup_files(device); 691 if (result) 692 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", 693 dev_name(&device->dev)); 694 695 return 0; 696 697 err: 698 mutex_lock(&acpi_device_lock); 699 if (device->parent) 700 list_del(&device->node); 701 list_del(&device->wakeup_list); 702 mutex_unlock(&acpi_device_lock); 703 704 err_detach: 705 acpi_detach_data(device->handle, acpi_scan_drop_device); 706 return result; 707 } 708 709 /* -------------------------------------------------------------------------- 710 Device Enumeration 711 -------------------------------------------------------------------------- */ 712 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) 713 { 714 struct acpi_device *device = NULL; 715 acpi_status status; 716 717 /* 718 * Fixed hardware devices do not appear in the namespace and do not 719 * have handles, but we fabricate acpi_devices for them, so we have 720 * to deal with them specially. 721 */ 722 if (!handle) 723 return acpi_root; 724 725 do { 726 status = acpi_get_parent(handle, &handle); 727 if (ACPI_FAILURE(status)) 728 return status == AE_NULL_ENTRY ? NULL : acpi_root; 729 } while (acpi_bus_get_device(handle, &device)); 730 return device; 731 } 732 733 acpi_status 734 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) 735 { 736 acpi_status status; 737 acpi_handle tmp; 738 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 739 union acpi_object *obj; 740 741 status = acpi_get_handle(handle, "_EJD", &tmp); 742 if (ACPI_FAILURE(status)) 743 return status; 744 745 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); 746 if (ACPI_SUCCESS(status)) { 747 obj = buffer.pointer; 748 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, 749 ejd); 750 kfree(buffer.pointer); 751 } 752 return status; 753 } 754 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); 755 756 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, 757 struct acpi_device_wakeup *wakeup) 758 { 759 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 760 union acpi_object *package = NULL; 761 union acpi_object *element = NULL; 762 acpi_status status; 763 int err = -ENODATA; 764 765 if (!wakeup) 766 return -EINVAL; 767 768 INIT_LIST_HEAD(&wakeup->resources); 769 770 /* _PRW */ 771 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); 772 if (ACPI_FAILURE(status)) { 773 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); 774 return err; 775 } 776 777 package = (union acpi_object *)buffer.pointer; 778 779 if (!package || package->package.count < 2) 780 goto out; 781 782 element = &(package->package.elements[0]); 783 if (!element) 784 goto out; 785 786 if (element->type == ACPI_TYPE_PACKAGE) { 787 if ((element->package.count < 2) || 788 (element->package.elements[0].type != 789 ACPI_TYPE_LOCAL_REFERENCE) 790 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) 791 goto out; 792 793 wakeup->gpe_device = 794 element->package.elements[0].reference.handle; 795 wakeup->gpe_number = 796 (u32) element->package.elements[1].integer.value; 797 } else if (element->type == ACPI_TYPE_INTEGER) { 798 wakeup->gpe_device = NULL; 799 wakeup->gpe_number = element->integer.value; 800 } else { 801 goto out; 802 } 803 804 element = &(package->package.elements[1]); 805 if (element->type != ACPI_TYPE_INTEGER) 806 goto out; 807 808 wakeup->sleep_state = element->integer.value; 809 810 err = acpi_extract_power_resources(package, 2, &wakeup->resources); 811 if (err) 812 goto out; 813 814 if (!list_empty(&wakeup->resources)) { 815 int sleep_state; 816 817 err = acpi_power_wakeup_list_init(&wakeup->resources, 818 &sleep_state); 819 if (err) { 820 acpi_handle_warn(handle, "Retrieving current states " 821 "of wakeup power resources failed\n"); 822 acpi_power_resources_list_free(&wakeup->resources); 823 goto out; 824 } 825 if (sleep_state < wakeup->sleep_state) { 826 acpi_handle_warn(handle, "Overriding _PRW sleep state " 827 "(S%d) by S%d from power resources\n", 828 (int)wakeup->sleep_state, sleep_state); 829 wakeup->sleep_state = sleep_state; 830 } 831 } 832 833 out: 834 kfree(buffer.pointer); 835 return err; 836 } 837 838 static void acpi_wakeup_gpe_init(struct acpi_device *device) 839 { 840 static const struct acpi_device_id button_device_ids[] = { 841 {"PNP0C0C", 0}, 842 {"PNP0C0D", 0}, 843 {"PNP0C0E", 0}, 844 {"", 0}, 845 }; 846 struct acpi_device_wakeup *wakeup = &device->wakeup; 847 acpi_status status; 848 acpi_event_status event_status; 849 850 wakeup->flags.notifier_present = 0; 851 852 /* Power button, Lid switch always enable wakeup */ 853 if (!acpi_match_device_ids(device, button_device_ids)) { 854 wakeup->flags.run_wake = 1; 855 if (!acpi_match_device_ids(device, &button_device_ids[1])) { 856 /* Do not use Lid/sleep button for S5 wakeup */ 857 if (wakeup->sleep_state == ACPI_STATE_S5) 858 wakeup->sleep_state = ACPI_STATE_S4; 859 } 860 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number); 861 device_set_wakeup_capable(&device->dev, true); 862 return; 863 } 864 865 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device, 866 wakeup->gpe_number); 867 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number, 868 &event_status); 869 if (ACPI_FAILURE(status)) 870 return; 871 872 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER); 873 } 874 875 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) 876 { 877 int err; 878 879 /* Presence of _PRW indicates wake capable */ 880 if (!acpi_has_method(device->handle, "_PRW")) 881 return; 882 883 err = acpi_bus_extract_wakeup_device_power_package(device->handle, 884 &device->wakeup); 885 if (err) { 886 dev_err(&device->dev, "_PRW evaluation error: %d\n", err); 887 return; 888 } 889 890 device->wakeup.flags.valid = 1; 891 device->wakeup.prepare_count = 0; 892 acpi_wakeup_gpe_init(device); 893 /* Call _PSW/_DSW object to disable its ability to wake the sleeping 894 * system for the ACPI device with the _PRW object. 895 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. 896 * So it is necessary to call _DSW object first. Only when it is not 897 * present will the _PSW object used. 898 */ 899 err = acpi_device_sleep_wake(device, 0, 0, 0); 900 if (err) 901 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 902 "error in _DSW or _PSW evaluation\n")); 903 } 904 905 static void acpi_bus_init_power_state(struct acpi_device *device, int state) 906 { 907 struct acpi_device_power_state *ps = &device->power.states[state]; 908 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; 909 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 910 acpi_status status; 911 912 INIT_LIST_HEAD(&ps->resources); 913 914 /* Evaluate "_PRx" to get referenced power resources */ 915 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); 916 if (ACPI_SUCCESS(status)) { 917 union acpi_object *package = buffer.pointer; 918 919 if (buffer.length && package 920 && package->type == ACPI_TYPE_PACKAGE 921 && package->package.count) { 922 int err = acpi_extract_power_resources(package, 0, 923 &ps->resources); 924 if (!err) 925 device->power.flags.power_resources = 1; 926 } 927 ACPI_FREE(buffer.pointer); 928 } 929 930 /* Evaluate "_PSx" to see if we can do explicit sets */ 931 pathname[2] = 'S'; 932 if (acpi_has_method(device->handle, pathname)) 933 ps->flags.explicit_set = 1; 934 935 /* State is valid if there are means to put the device into it. */ 936 if (!list_empty(&ps->resources) || ps->flags.explicit_set) 937 ps->flags.valid = 1; 938 939 ps->power = -1; /* Unknown - driver assigned */ 940 ps->latency = -1; /* Unknown - driver assigned */ 941 } 942 943 static void acpi_bus_get_power_flags(struct acpi_device *device) 944 { 945 u32 i; 946 947 /* Presence of _PS0|_PR0 indicates 'power manageable' */ 948 if (!acpi_has_method(device->handle, "_PS0") && 949 !acpi_has_method(device->handle, "_PR0")) 950 return; 951 952 device->flags.power_manageable = 1; 953 954 /* 955 * Power Management Flags 956 */ 957 if (acpi_has_method(device->handle, "_PSC")) 958 device->power.flags.explicit_get = 1; 959 960 if (acpi_has_method(device->handle, "_IRC")) 961 device->power.flags.inrush_current = 1; 962 963 if (acpi_has_method(device->handle, "_DSW")) 964 device->power.flags.dsw_present = 1; 965 966 /* 967 * Enumerate supported power management states 968 */ 969 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) 970 acpi_bus_init_power_state(device, i); 971 972 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); 973 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources)) 974 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; 975 976 /* Set defaults for D0 and D3hot states (always valid) */ 977 device->power.states[ACPI_STATE_D0].flags.valid = 1; 978 device->power.states[ACPI_STATE_D0].power = 100; 979 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1; 980 981 if (acpi_bus_init_power(device)) 982 device->flags.power_manageable = 0; 983 } 984 985 static void acpi_bus_get_flags(struct acpi_device *device) 986 { 987 /* Presence of _STA indicates 'dynamic_status' */ 988 if (acpi_has_method(device->handle, "_STA")) 989 device->flags.dynamic_status = 1; 990 991 /* Presence of _RMV indicates 'removable' */ 992 if (acpi_has_method(device->handle, "_RMV")) 993 device->flags.removable = 1; 994 995 /* Presence of _EJD|_EJ0 indicates 'ejectable' */ 996 if (acpi_has_method(device->handle, "_EJD") || 997 acpi_has_method(device->handle, "_EJ0")) 998 device->flags.ejectable = 1; 999 } 1000 1001 static void acpi_device_get_busid(struct acpi_device *device) 1002 { 1003 char bus_id[5] = { '?', 0 }; 1004 struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; 1005 int i = 0; 1006 1007 /* 1008 * Bus ID 1009 * ------ 1010 * The device's Bus ID is simply the object name. 1011 * TBD: Shouldn't this value be unique (within the ACPI namespace)? 1012 */ 1013 if (ACPI_IS_ROOT_DEVICE(device)) { 1014 strcpy(device->pnp.bus_id, "ACPI"); 1015 return; 1016 } 1017 1018 switch (device->device_type) { 1019 case ACPI_BUS_TYPE_POWER_BUTTON: 1020 strcpy(device->pnp.bus_id, "PWRF"); 1021 break; 1022 case ACPI_BUS_TYPE_SLEEP_BUTTON: 1023 strcpy(device->pnp.bus_id, "SLPF"); 1024 break; 1025 default: 1026 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); 1027 /* Clean up trailing underscores (if any) */ 1028 for (i = 3; i > 1; i--) { 1029 if (bus_id[i] == '_') 1030 bus_id[i] = '\0'; 1031 else 1032 break; 1033 } 1034 strcpy(device->pnp.bus_id, bus_id); 1035 break; 1036 } 1037 } 1038 1039 /* 1040 * acpi_ata_match - see if an acpi object is an ATA device 1041 * 1042 * If an acpi object has one of the ACPI ATA methods defined, 1043 * then we can safely call it an ATA device. 1044 */ 1045 bool acpi_ata_match(acpi_handle handle) 1046 { 1047 return acpi_has_method(handle, "_GTF") || 1048 acpi_has_method(handle, "_GTM") || 1049 acpi_has_method(handle, "_STM") || 1050 acpi_has_method(handle, "_SDD"); 1051 } 1052 1053 /* 1054 * acpi_bay_match - see if an acpi object is an ejectable driver bay 1055 * 1056 * If an acpi object is ejectable and has one of the ACPI ATA methods defined, 1057 * then we can safely call it an ejectable drive bay 1058 */ 1059 bool acpi_bay_match(acpi_handle handle) 1060 { 1061 acpi_handle phandle; 1062 1063 if (!acpi_has_method(handle, "_EJ0")) 1064 return false; 1065 if (acpi_ata_match(handle)) 1066 return true; 1067 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) 1068 return false; 1069 1070 return acpi_ata_match(phandle); 1071 } 1072 1073 bool acpi_device_is_battery(struct acpi_device *adev) 1074 { 1075 struct acpi_hardware_id *hwid; 1076 1077 list_for_each_entry(hwid, &adev->pnp.ids, list) 1078 if (!strcmp("PNP0C0A", hwid->id)) 1079 return true; 1080 1081 return false; 1082 } 1083 1084 static bool is_ejectable_bay(struct acpi_device *adev) 1085 { 1086 acpi_handle handle = adev->handle; 1087 1088 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev)) 1089 return true; 1090 1091 return acpi_bay_match(handle); 1092 } 1093 1094 /* 1095 * acpi_dock_match - see if an acpi object has a _DCK method 1096 */ 1097 bool acpi_dock_match(acpi_handle handle) 1098 { 1099 return acpi_has_method(handle, "_DCK"); 1100 } 1101 1102 static acpi_status 1103 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context, 1104 void **return_value) 1105 { 1106 long *cap = context; 1107 1108 if (acpi_has_method(handle, "_BCM") && 1109 acpi_has_method(handle, "_BCL")) { 1110 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight " 1111 "support\n")); 1112 *cap |= ACPI_VIDEO_BACKLIGHT; 1113 /* We have backlight support, no need to scan further */ 1114 return AE_CTRL_TERMINATE; 1115 } 1116 return 0; 1117 } 1118 1119 /* Returns true if the ACPI object is a video device which can be 1120 * handled by video.ko. 1121 * The device will get a Linux specific CID added in scan.c to 1122 * identify the device as an ACPI graphics device 1123 * Be aware that the graphics device may not be physically present 1124 * Use acpi_video_get_capabilities() to detect general ACPI video 1125 * capabilities of present cards 1126 */ 1127 long acpi_is_video_device(acpi_handle handle) 1128 { 1129 long video_caps = 0; 1130 1131 /* Is this device able to support video switching ? */ 1132 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS")) 1133 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING; 1134 1135 /* Is this device able to retrieve a video ROM ? */ 1136 if (acpi_has_method(handle, "_ROM")) 1137 video_caps |= ACPI_VIDEO_ROM_AVAILABLE; 1138 1139 /* Is this device able to configure which video head to be POSTed ? */ 1140 if (acpi_has_method(handle, "_VPO") && 1141 acpi_has_method(handle, "_GPD") && 1142 acpi_has_method(handle, "_SPD")) 1143 video_caps |= ACPI_VIDEO_DEVICE_POSTING; 1144 1145 /* Only check for backlight functionality if one of the above hit. */ 1146 if (video_caps) 1147 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1148 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL, 1149 &video_caps, NULL); 1150 1151 return video_caps; 1152 } 1153 EXPORT_SYMBOL(acpi_is_video_device); 1154 1155 const char *acpi_device_hid(struct acpi_device *device) 1156 { 1157 struct acpi_hardware_id *hid; 1158 1159 if (list_empty(&device->pnp.ids)) 1160 return dummy_hid; 1161 1162 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); 1163 return hid->id; 1164 } 1165 EXPORT_SYMBOL(acpi_device_hid); 1166 1167 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) 1168 { 1169 struct acpi_hardware_id *id; 1170 1171 id = kmalloc(sizeof(*id), GFP_KERNEL); 1172 if (!id) 1173 return; 1174 1175 id->id = kstrdup_const(dev_id, GFP_KERNEL); 1176 if (!id->id) { 1177 kfree(id); 1178 return; 1179 } 1180 1181 list_add_tail(&id->list, &pnp->ids); 1182 pnp->type.hardware_id = 1; 1183 } 1184 1185 /* 1186 * Old IBM workstations have a DSDT bug wherein the SMBus object 1187 * lacks the SMBUS01 HID and the methods do not have the necessary "_" 1188 * prefix. Work around this. 1189 */ 1190 static bool acpi_ibm_smbus_match(acpi_handle handle) 1191 { 1192 char node_name[ACPI_PATH_SEGMENT_LENGTH]; 1193 struct acpi_buffer path = { sizeof(node_name), node_name }; 1194 1195 if (!dmi_name_in_vendors("IBM")) 1196 return false; 1197 1198 /* Look for SMBS object */ 1199 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || 1200 strcmp("SMBS", path.pointer)) 1201 return false; 1202 1203 /* Does it have the necessary (but misnamed) methods? */ 1204 if (acpi_has_method(handle, "SBI") && 1205 acpi_has_method(handle, "SBR") && 1206 acpi_has_method(handle, "SBW")) 1207 return true; 1208 1209 return false; 1210 } 1211 1212 static bool acpi_object_is_system_bus(acpi_handle handle) 1213 { 1214 acpi_handle tmp; 1215 1216 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) && 1217 tmp == handle) 1218 return true; 1219 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) && 1220 tmp == handle) 1221 return true; 1222 1223 return false; 1224 } 1225 1226 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, 1227 int device_type) 1228 { 1229 acpi_status status; 1230 struct acpi_device_info *info; 1231 struct acpi_pnp_device_id_list *cid_list; 1232 int i; 1233 1234 switch (device_type) { 1235 case ACPI_BUS_TYPE_DEVICE: 1236 if (handle == ACPI_ROOT_OBJECT) { 1237 acpi_add_id(pnp, ACPI_SYSTEM_HID); 1238 break; 1239 } 1240 1241 status = acpi_get_object_info(handle, &info); 1242 if (ACPI_FAILURE(status)) { 1243 pr_err(PREFIX "%s: Error reading device info\n", 1244 __func__); 1245 return; 1246 } 1247 1248 if (info->valid & ACPI_VALID_HID) { 1249 acpi_add_id(pnp, info->hardware_id.string); 1250 pnp->type.platform_id = 1; 1251 } 1252 if (info->valid & ACPI_VALID_CID) { 1253 cid_list = &info->compatible_id_list; 1254 for (i = 0; i < cid_list->count; i++) 1255 acpi_add_id(pnp, cid_list->ids[i].string); 1256 } 1257 if (info->valid & ACPI_VALID_ADR) { 1258 pnp->bus_address = info->address; 1259 pnp->type.bus_address = 1; 1260 } 1261 if (info->valid & ACPI_VALID_UID) 1262 pnp->unique_id = kstrdup(info->unique_id.string, 1263 GFP_KERNEL); 1264 if (info->valid & ACPI_VALID_CLS) 1265 acpi_add_id(pnp, info->class_code.string); 1266 1267 kfree(info); 1268 1269 /* 1270 * Some devices don't reliably have _HIDs & _CIDs, so add 1271 * synthetic HIDs to make sure drivers can find them. 1272 */ 1273 if (acpi_is_video_device(handle)) 1274 acpi_add_id(pnp, ACPI_VIDEO_HID); 1275 else if (acpi_bay_match(handle)) 1276 acpi_add_id(pnp, ACPI_BAY_HID); 1277 else if (acpi_dock_match(handle)) 1278 acpi_add_id(pnp, ACPI_DOCK_HID); 1279 else if (acpi_ibm_smbus_match(handle)) 1280 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); 1281 else if (list_empty(&pnp->ids) && 1282 acpi_object_is_system_bus(handle)) { 1283 /* \_SB, \_TZ, LNXSYBUS */ 1284 acpi_add_id(pnp, ACPI_BUS_HID); 1285 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); 1286 strcpy(pnp->device_class, ACPI_BUS_CLASS); 1287 } 1288 1289 break; 1290 case ACPI_BUS_TYPE_POWER: 1291 acpi_add_id(pnp, ACPI_POWER_HID); 1292 break; 1293 case ACPI_BUS_TYPE_PROCESSOR: 1294 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); 1295 break; 1296 case ACPI_BUS_TYPE_THERMAL: 1297 acpi_add_id(pnp, ACPI_THERMAL_HID); 1298 break; 1299 case ACPI_BUS_TYPE_POWER_BUTTON: 1300 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); 1301 break; 1302 case ACPI_BUS_TYPE_SLEEP_BUTTON: 1303 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); 1304 break; 1305 } 1306 } 1307 1308 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) 1309 { 1310 struct acpi_hardware_id *id, *tmp; 1311 1312 list_for_each_entry_safe(id, tmp, &pnp->ids, list) { 1313 kfree_const(id->id); 1314 kfree(id); 1315 } 1316 kfree(pnp->unique_id); 1317 } 1318 1319 /** 1320 * acpi_dma_supported - Check DMA support for the specified device. 1321 * @adev: The pointer to acpi device 1322 * 1323 * Return false if DMA is not supported. Otherwise, return true 1324 */ 1325 bool acpi_dma_supported(struct acpi_device *adev) 1326 { 1327 if (!adev) 1328 return false; 1329 1330 if (adev->flags.cca_seen) 1331 return true; 1332 1333 /* 1334 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent 1335 * DMA on "Intel platforms". Presumably that includes all x86 and 1336 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y. 1337 */ 1338 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) 1339 return true; 1340 1341 return false; 1342 } 1343 1344 /** 1345 * acpi_get_dma_attr - Check the supported DMA attr for the specified device. 1346 * @adev: The pointer to acpi device 1347 * 1348 * Return enum dev_dma_attr. 1349 */ 1350 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) 1351 { 1352 if (!acpi_dma_supported(adev)) 1353 return DEV_DMA_NOT_SUPPORTED; 1354 1355 if (adev->flags.coherent_dma) 1356 return DEV_DMA_COHERENT; 1357 else 1358 return DEV_DMA_NON_COHERENT; 1359 } 1360 1361 /** 1362 * acpi_dma_configure - Set-up DMA configuration for the device. 1363 * @dev: The pointer to the device 1364 * @attr: device dma attributes 1365 */ 1366 int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr) 1367 { 1368 const struct iommu_ops *iommu; 1369 u64 size; 1370 1371 iort_set_dma_mask(dev); 1372 1373 iommu = iort_iommu_configure(dev); 1374 if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER) 1375 return -EPROBE_DEFER; 1376 1377 size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1); 1378 /* 1379 * Assume dma valid range starts at 0 and covers the whole 1380 * coherent_dma_mask. 1381 */ 1382 arch_setup_dma_ops(dev, 0, size, iommu, attr == DEV_DMA_COHERENT); 1383 1384 return 0; 1385 } 1386 EXPORT_SYMBOL_GPL(acpi_dma_configure); 1387 1388 /** 1389 * acpi_dma_deconfigure - Tear-down DMA configuration for the device. 1390 * @dev: The pointer to the device 1391 */ 1392 void acpi_dma_deconfigure(struct device *dev) 1393 { 1394 arch_teardown_dma_ops(dev); 1395 } 1396 EXPORT_SYMBOL_GPL(acpi_dma_deconfigure); 1397 1398 static void acpi_init_coherency(struct acpi_device *adev) 1399 { 1400 unsigned long long cca = 0; 1401 acpi_status status; 1402 struct acpi_device *parent = adev->parent; 1403 1404 if (parent && parent->flags.cca_seen) { 1405 /* 1406 * From ACPI spec, OSPM will ignore _CCA if an ancestor 1407 * already saw one. 1408 */ 1409 adev->flags.cca_seen = 1; 1410 cca = parent->flags.coherent_dma; 1411 } else { 1412 status = acpi_evaluate_integer(adev->handle, "_CCA", 1413 NULL, &cca); 1414 if (ACPI_SUCCESS(status)) 1415 adev->flags.cca_seen = 1; 1416 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) 1417 /* 1418 * If architecture does not specify that _CCA is 1419 * required for DMA-able devices (e.g. x86), 1420 * we default to _CCA=1. 1421 */ 1422 cca = 1; 1423 else 1424 acpi_handle_debug(adev->handle, 1425 "ACPI device is missing _CCA.\n"); 1426 } 1427 1428 adev->flags.coherent_dma = cca; 1429 } 1430 1431 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, 1432 int type, unsigned long long sta) 1433 { 1434 INIT_LIST_HEAD(&device->pnp.ids); 1435 device->device_type = type; 1436 device->handle = handle; 1437 device->parent = acpi_bus_get_parent(handle); 1438 device->fwnode.type = FWNODE_ACPI; 1439 acpi_set_device_status(device, sta); 1440 acpi_device_get_busid(device); 1441 acpi_set_pnp_ids(handle, &device->pnp, type); 1442 acpi_init_properties(device); 1443 acpi_bus_get_flags(device); 1444 device->flags.match_driver = false; 1445 device->flags.initialized = true; 1446 acpi_device_clear_enumerated(device); 1447 device_initialize(&device->dev); 1448 dev_set_uevent_suppress(&device->dev, true); 1449 acpi_init_coherency(device); 1450 } 1451 1452 void acpi_device_add_finalize(struct acpi_device *device) 1453 { 1454 dev_set_uevent_suppress(&device->dev, false); 1455 kobject_uevent(&device->dev.kobj, KOBJ_ADD); 1456 } 1457 1458 static int acpi_add_single_object(struct acpi_device **child, 1459 acpi_handle handle, int type, 1460 unsigned long long sta) 1461 { 1462 int result; 1463 struct acpi_device *device; 1464 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1465 1466 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); 1467 if (!device) { 1468 printk(KERN_ERR PREFIX "Memory allocation error\n"); 1469 return -ENOMEM; 1470 } 1471 1472 acpi_init_device_object(device, handle, type, sta); 1473 acpi_bus_get_power_flags(device); 1474 acpi_bus_get_wakeup_device_flags(device); 1475 1476 result = acpi_device_add(device, acpi_device_release); 1477 if (result) { 1478 acpi_device_release(&device->dev); 1479 return result; 1480 } 1481 1482 acpi_power_add_remove_device(device, true); 1483 acpi_device_add_finalize(device); 1484 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1485 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", 1486 dev_name(&device->dev), (char *) buffer.pointer, 1487 device->parent ? dev_name(&device->parent->dev) : "(null)")); 1488 kfree(buffer.pointer); 1489 *child = device; 1490 return 0; 1491 } 1492 1493 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares, 1494 void *context) 1495 { 1496 struct resource *res = context; 1497 1498 if (acpi_dev_resource_memory(ares, res)) 1499 return AE_CTRL_TERMINATE; 1500 1501 return AE_OK; 1502 } 1503 1504 static bool acpi_device_should_be_hidden(acpi_handle handle) 1505 { 1506 acpi_status status; 1507 struct resource res; 1508 1509 /* Check if it should ignore the UART device */ 1510 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS))) 1511 return false; 1512 1513 /* 1514 * The UART device described in SPCR table is assumed to have only one 1515 * memory resource present. So we only look for the first one here. 1516 */ 1517 status = acpi_walk_resources(handle, METHOD_NAME__CRS, 1518 acpi_get_resource_memory, &res); 1519 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr) 1520 return false; 1521 1522 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n", 1523 &res.start); 1524 1525 return true; 1526 } 1527 1528 static int acpi_bus_type_and_status(acpi_handle handle, int *type, 1529 unsigned long long *sta) 1530 { 1531 acpi_status status; 1532 acpi_object_type acpi_type; 1533 1534 status = acpi_get_type(handle, &acpi_type); 1535 if (ACPI_FAILURE(status)) 1536 return -ENODEV; 1537 1538 switch (acpi_type) { 1539 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ 1540 case ACPI_TYPE_DEVICE: 1541 if (acpi_device_should_be_hidden(handle)) 1542 return -ENODEV; 1543 1544 *type = ACPI_BUS_TYPE_DEVICE; 1545 status = acpi_bus_get_status_handle(handle, sta); 1546 if (ACPI_FAILURE(status)) 1547 *sta = 0; 1548 break; 1549 case ACPI_TYPE_PROCESSOR: 1550 *type = ACPI_BUS_TYPE_PROCESSOR; 1551 status = acpi_bus_get_status_handle(handle, sta); 1552 if (ACPI_FAILURE(status)) 1553 return -ENODEV; 1554 break; 1555 case ACPI_TYPE_THERMAL: 1556 *type = ACPI_BUS_TYPE_THERMAL; 1557 *sta = ACPI_STA_DEFAULT; 1558 break; 1559 case ACPI_TYPE_POWER: 1560 *type = ACPI_BUS_TYPE_POWER; 1561 *sta = ACPI_STA_DEFAULT; 1562 break; 1563 default: 1564 return -ENODEV; 1565 } 1566 1567 return 0; 1568 } 1569 1570 bool acpi_device_is_present(struct acpi_device *adev) 1571 { 1572 if (adev->status.present || adev->status.functional) 1573 return true; 1574 1575 adev->flags.initialized = false; 1576 return false; 1577 } 1578 1579 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, 1580 const char *idstr, 1581 const struct acpi_device_id **matchid) 1582 { 1583 const struct acpi_device_id *devid; 1584 1585 if (handler->match) 1586 return handler->match(idstr, matchid); 1587 1588 for (devid = handler->ids; devid->id[0]; devid++) 1589 if (!strcmp((char *)devid->id, idstr)) { 1590 if (matchid) 1591 *matchid = devid; 1592 1593 return true; 1594 } 1595 1596 return false; 1597 } 1598 1599 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr, 1600 const struct acpi_device_id **matchid) 1601 { 1602 struct acpi_scan_handler *handler; 1603 1604 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) 1605 if (acpi_scan_handler_matching(handler, idstr, matchid)) 1606 return handler; 1607 1608 return NULL; 1609 } 1610 1611 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) 1612 { 1613 if (!!hotplug->enabled == !!val) 1614 return; 1615 1616 mutex_lock(&acpi_scan_lock); 1617 1618 hotplug->enabled = val; 1619 1620 mutex_unlock(&acpi_scan_lock); 1621 } 1622 1623 static void acpi_scan_init_hotplug(struct acpi_device *adev) 1624 { 1625 struct acpi_hardware_id *hwid; 1626 1627 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) { 1628 acpi_dock_add(adev); 1629 return; 1630 } 1631 list_for_each_entry(hwid, &adev->pnp.ids, list) { 1632 struct acpi_scan_handler *handler; 1633 1634 handler = acpi_scan_match_handler(hwid->id, NULL); 1635 if (handler) { 1636 adev->flags.hotplug_notify = true; 1637 break; 1638 } 1639 } 1640 } 1641 1642 static void acpi_device_dep_initialize(struct acpi_device *adev) 1643 { 1644 struct acpi_dep_data *dep; 1645 struct acpi_handle_list dep_devices; 1646 acpi_status status; 1647 int i; 1648 1649 if (!acpi_has_method(adev->handle, "_DEP")) 1650 return; 1651 1652 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL, 1653 &dep_devices); 1654 if (ACPI_FAILURE(status)) { 1655 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n"); 1656 return; 1657 } 1658 1659 for (i = 0; i < dep_devices.count; i++) { 1660 struct acpi_device_info *info; 1661 int skip; 1662 1663 status = acpi_get_object_info(dep_devices.handles[i], &info); 1664 if (ACPI_FAILURE(status)) { 1665 dev_dbg(&adev->dev, "Error reading _DEP device info\n"); 1666 continue; 1667 } 1668 1669 /* 1670 * Skip the dependency of Windows System Power 1671 * Management Controller 1672 */ 1673 skip = info->valid & ACPI_VALID_HID && 1674 !strcmp(info->hardware_id.string, "INT3396"); 1675 1676 kfree(info); 1677 1678 if (skip) 1679 continue; 1680 1681 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL); 1682 if (!dep) 1683 return; 1684 1685 dep->master = dep_devices.handles[i]; 1686 dep->slave = adev->handle; 1687 adev->dep_unmet++; 1688 1689 mutex_lock(&acpi_dep_list_lock); 1690 list_add_tail(&dep->node , &acpi_dep_list); 1691 mutex_unlock(&acpi_dep_list_lock); 1692 } 1693 } 1694 1695 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, 1696 void *not_used, void **return_value) 1697 { 1698 struct acpi_device *device = NULL; 1699 int type; 1700 unsigned long long sta; 1701 int result; 1702 1703 acpi_bus_get_device(handle, &device); 1704 if (device) 1705 goto out; 1706 1707 result = acpi_bus_type_and_status(handle, &type, &sta); 1708 if (result) 1709 return AE_OK; 1710 1711 if (type == ACPI_BUS_TYPE_POWER) { 1712 acpi_add_power_resource(handle); 1713 return AE_OK; 1714 } 1715 1716 acpi_add_single_object(&device, handle, type, sta); 1717 if (!device) 1718 return AE_CTRL_DEPTH; 1719 1720 acpi_scan_init_hotplug(device); 1721 acpi_device_dep_initialize(device); 1722 1723 out: 1724 if (!*return_value) 1725 *return_value = device; 1726 1727 return AE_OK; 1728 } 1729 1730 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data) 1731 { 1732 bool *is_spi_i2c_slave_p = data; 1733 1734 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) 1735 return 1; 1736 1737 /* 1738 * devices that are connected to UART still need to be enumerated to 1739 * platform bus 1740 */ 1741 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART) 1742 *is_spi_i2c_slave_p = true; 1743 1744 /* no need to do more checking */ 1745 return -1; 1746 } 1747 1748 static void acpi_default_enumeration(struct acpi_device *device) 1749 { 1750 struct list_head resource_list; 1751 bool is_spi_i2c_slave = false; 1752 1753 /* 1754 * Do not enumerate SPI/I2C slaves as they will be enumerated by their 1755 * respective parents. 1756 */ 1757 INIT_LIST_HEAD(&resource_list); 1758 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave, 1759 &is_spi_i2c_slave); 1760 acpi_dev_free_resource_list(&resource_list); 1761 if (!is_spi_i2c_slave) { 1762 acpi_create_platform_device(device, NULL); 1763 acpi_device_set_enumerated(device); 1764 } else { 1765 blocking_notifier_call_chain(&acpi_reconfig_chain, 1766 ACPI_RECONFIG_DEVICE_ADD, device); 1767 } 1768 } 1769 1770 static const struct acpi_device_id generic_device_ids[] = { 1771 {ACPI_DT_NAMESPACE_HID, }, 1772 {"", }, 1773 }; 1774 1775 static int acpi_generic_device_attach(struct acpi_device *adev, 1776 const struct acpi_device_id *not_used) 1777 { 1778 /* 1779 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test 1780 * below can be unconditional. 1781 */ 1782 if (adev->data.of_compatible) 1783 acpi_default_enumeration(adev); 1784 1785 return 1; 1786 } 1787 1788 static struct acpi_scan_handler generic_device_handler = { 1789 .ids = generic_device_ids, 1790 .attach = acpi_generic_device_attach, 1791 }; 1792 1793 static int acpi_scan_attach_handler(struct acpi_device *device) 1794 { 1795 struct acpi_hardware_id *hwid; 1796 int ret = 0; 1797 1798 list_for_each_entry(hwid, &device->pnp.ids, list) { 1799 const struct acpi_device_id *devid; 1800 struct acpi_scan_handler *handler; 1801 1802 handler = acpi_scan_match_handler(hwid->id, &devid); 1803 if (handler) { 1804 if (!handler->attach) { 1805 device->pnp.type.platform_id = 0; 1806 continue; 1807 } 1808 device->handler = handler; 1809 ret = handler->attach(device, devid); 1810 if (ret > 0) 1811 break; 1812 1813 device->handler = NULL; 1814 if (ret < 0) 1815 break; 1816 } 1817 } 1818 1819 return ret; 1820 } 1821 1822 static void acpi_bus_attach(struct acpi_device *device) 1823 { 1824 struct acpi_device *child; 1825 acpi_handle ejd; 1826 int ret; 1827 1828 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd))) 1829 register_dock_dependent_device(device, ejd); 1830 1831 acpi_bus_get_status(device); 1832 /* Skip devices that are not present. */ 1833 if (!acpi_device_is_present(device)) { 1834 acpi_device_clear_enumerated(device); 1835 device->flags.power_manageable = 0; 1836 return; 1837 } 1838 if (device->handler) 1839 goto ok; 1840 1841 if (!device->flags.initialized) { 1842 device->flags.power_manageable = 1843 device->power.states[ACPI_STATE_D0].flags.valid; 1844 if (acpi_bus_init_power(device)) 1845 device->flags.power_manageable = 0; 1846 1847 device->flags.initialized = true; 1848 } else if (device->flags.visited) { 1849 goto ok; 1850 } 1851 1852 ret = acpi_scan_attach_handler(device); 1853 if (ret < 0) 1854 return; 1855 1856 device->flags.match_driver = true; 1857 if (ret > 0) { 1858 acpi_device_set_enumerated(device); 1859 goto ok; 1860 } 1861 1862 ret = device_attach(&device->dev); 1863 if (ret < 0) 1864 return; 1865 1866 if (device->pnp.type.platform_id) 1867 acpi_default_enumeration(device); 1868 else 1869 acpi_device_set_enumerated(device); 1870 1871 ok: 1872 list_for_each_entry(child, &device->children, node) 1873 acpi_bus_attach(child); 1874 1875 if (device->handler && device->handler->hotplug.notify_online) 1876 device->handler->hotplug.notify_online(device); 1877 } 1878 1879 void acpi_walk_dep_device_list(acpi_handle handle) 1880 { 1881 struct acpi_dep_data *dep, *tmp; 1882 struct acpi_device *adev; 1883 1884 mutex_lock(&acpi_dep_list_lock); 1885 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { 1886 if (dep->master == handle) { 1887 acpi_bus_get_device(dep->slave, &adev); 1888 if (!adev) 1889 continue; 1890 1891 adev->dep_unmet--; 1892 if (!adev->dep_unmet) 1893 acpi_bus_attach(adev); 1894 list_del(&dep->node); 1895 kfree(dep); 1896 } 1897 } 1898 mutex_unlock(&acpi_dep_list_lock); 1899 } 1900 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list); 1901 1902 /** 1903 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. 1904 * @handle: Root of the namespace scope to scan. 1905 * 1906 * Scan a given ACPI tree (probably recently hot-plugged) and create and add 1907 * found devices. 1908 * 1909 * If no devices were found, -ENODEV is returned, but it does not mean that 1910 * there has been a real error. There just have been no suitable ACPI objects 1911 * in the table trunk from which the kernel could create a device and add an 1912 * appropriate driver. 1913 * 1914 * Must be called under acpi_scan_lock. 1915 */ 1916 int acpi_bus_scan(acpi_handle handle) 1917 { 1918 void *device = NULL; 1919 1920 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) 1921 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, 1922 acpi_bus_check_add, NULL, NULL, &device); 1923 1924 if (device) { 1925 acpi_bus_attach(device); 1926 return 0; 1927 } 1928 return -ENODEV; 1929 } 1930 EXPORT_SYMBOL(acpi_bus_scan); 1931 1932 /** 1933 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. 1934 * @adev: Root of the ACPI namespace scope to walk. 1935 * 1936 * Must be called under acpi_scan_lock. 1937 */ 1938 void acpi_bus_trim(struct acpi_device *adev) 1939 { 1940 struct acpi_scan_handler *handler = adev->handler; 1941 struct acpi_device *child; 1942 1943 list_for_each_entry_reverse(child, &adev->children, node) 1944 acpi_bus_trim(child); 1945 1946 adev->flags.match_driver = false; 1947 if (handler) { 1948 if (handler->detach) 1949 handler->detach(adev); 1950 1951 adev->handler = NULL; 1952 } else { 1953 device_release_driver(&adev->dev); 1954 } 1955 /* 1956 * Most likely, the device is going away, so put it into D3cold before 1957 * that. 1958 */ 1959 acpi_device_set_power(adev, ACPI_STATE_D3_COLD); 1960 adev->flags.initialized = false; 1961 acpi_device_clear_enumerated(adev); 1962 } 1963 EXPORT_SYMBOL_GPL(acpi_bus_trim); 1964 1965 static int acpi_bus_scan_fixed(void) 1966 { 1967 int result = 0; 1968 1969 /* 1970 * Enumerate all fixed-feature devices. 1971 */ 1972 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { 1973 struct acpi_device *device = NULL; 1974 1975 result = acpi_add_single_object(&device, NULL, 1976 ACPI_BUS_TYPE_POWER_BUTTON, 1977 ACPI_STA_DEFAULT); 1978 if (result) 1979 return result; 1980 1981 device->flags.match_driver = true; 1982 result = device_attach(&device->dev); 1983 if (result < 0) 1984 return result; 1985 1986 device_init_wakeup(&device->dev, true); 1987 } 1988 1989 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { 1990 struct acpi_device *device = NULL; 1991 1992 result = acpi_add_single_object(&device, NULL, 1993 ACPI_BUS_TYPE_SLEEP_BUTTON, 1994 ACPI_STA_DEFAULT); 1995 if (result) 1996 return result; 1997 1998 device->flags.match_driver = true; 1999 result = device_attach(&device->dev); 2000 } 2001 2002 return result < 0 ? result : 0; 2003 } 2004 2005 static void __init acpi_get_spcr_uart_addr(void) 2006 { 2007 acpi_status status; 2008 struct acpi_table_spcr *spcr_ptr; 2009 2010 status = acpi_get_table(ACPI_SIG_SPCR, 0, 2011 (struct acpi_table_header **)&spcr_ptr); 2012 if (ACPI_SUCCESS(status)) 2013 spcr_uart_addr = spcr_ptr->serial_port.address; 2014 else 2015 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n"); 2016 } 2017 2018 static bool acpi_scan_initialized; 2019 2020 int __init acpi_scan_init(void) 2021 { 2022 int result; 2023 acpi_status status; 2024 struct acpi_table_stao *stao_ptr; 2025 2026 acpi_pci_root_init(); 2027 acpi_pci_link_init(); 2028 acpi_processor_init(); 2029 acpi_lpss_init(); 2030 acpi_apd_init(); 2031 acpi_cmos_rtc_init(); 2032 acpi_container_init(); 2033 acpi_memory_hotplug_init(); 2034 acpi_pnp_init(); 2035 acpi_int340x_thermal_init(); 2036 acpi_amba_init(); 2037 acpi_watchdog_init(); 2038 2039 acpi_scan_add_handler(&generic_device_handler); 2040 2041 /* 2042 * If there is STAO table, check whether it needs to ignore the UART 2043 * device in SPCR table. 2044 */ 2045 status = acpi_get_table(ACPI_SIG_STAO, 0, 2046 (struct acpi_table_header **)&stao_ptr); 2047 if (ACPI_SUCCESS(status)) { 2048 if (stao_ptr->header.length > sizeof(struct acpi_table_stao)) 2049 printk(KERN_INFO PREFIX "STAO Name List not yet supported."); 2050 2051 if (stao_ptr->ignore_uart) 2052 acpi_get_spcr_uart_addr(); 2053 } 2054 2055 mutex_lock(&acpi_scan_lock); 2056 /* 2057 * Enumerate devices in the ACPI namespace. 2058 */ 2059 result = acpi_bus_scan(ACPI_ROOT_OBJECT); 2060 if (result) 2061 goto out; 2062 2063 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); 2064 if (result) 2065 goto out; 2066 2067 /* Fixed feature devices do not exist on HW-reduced platform */ 2068 if (!acpi_gbl_reduced_hardware) { 2069 result = acpi_bus_scan_fixed(); 2070 if (result) { 2071 acpi_detach_data(acpi_root->handle, 2072 acpi_scan_drop_device); 2073 acpi_device_del(acpi_root); 2074 put_device(&acpi_root->dev); 2075 goto out; 2076 } 2077 } 2078 2079 acpi_gpe_apply_masked_gpes(); 2080 acpi_update_all_gpes(); 2081 acpi_ec_ecdt_start(); 2082 2083 acpi_scan_initialized = true; 2084 2085 out: 2086 mutex_unlock(&acpi_scan_lock); 2087 return result; 2088 } 2089 2090 static struct acpi_probe_entry *ape; 2091 static int acpi_probe_count; 2092 static DEFINE_MUTEX(acpi_probe_mutex); 2093 2094 static int __init acpi_match_madt(struct acpi_subtable_header *header, 2095 const unsigned long end) 2096 { 2097 if (!ape->subtable_valid || ape->subtable_valid(header, ape)) 2098 if (!ape->probe_subtbl(header, end)) 2099 acpi_probe_count++; 2100 2101 return 0; 2102 } 2103 2104 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr) 2105 { 2106 int count = 0; 2107 2108 if (acpi_disabled) 2109 return 0; 2110 2111 mutex_lock(&acpi_probe_mutex); 2112 for (ape = ap_head; nr; ape++, nr--) { 2113 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) { 2114 acpi_probe_count = 0; 2115 acpi_table_parse_madt(ape->type, acpi_match_madt, 0); 2116 count += acpi_probe_count; 2117 } else { 2118 int res; 2119 res = acpi_table_parse(ape->id, ape->probe_table); 2120 if (!res) 2121 count++; 2122 } 2123 } 2124 mutex_unlock(&acpi_probe_mutex); 2125 2126 return count; 2127 } 2128 2129 struct acpi_table_events_work { 2130 struct work_struct work; 2131 void *table; 2132 u32 event; 2133 }; 2134 2135 static void acpi_table_events_fn(struct work_struct *work) 2136 { 2137 struct acpi_table_events_work *tew; 2138 2139 tew = container_of(work, struct acpi_table_events_work, work); 2140 2141 if (tew->event == ACPI_TABLE_EVENT_LOAD) { 2142 acpi_scan_lock_acquire(); 2143 acpi_bus_scan(ACPI_ROOT_OBJECT); 2144 acpi_scan_lock_release(); 2145 } 2146 2147 kfree(tew); 2148 } 2149 2150 void acpi_scan_table_handler(u32 event, void *table, void *context) 2151 { 2152 struct acpi_table_events_work *tew; 2153 2154 if (!acpi_scan_initialized) 2155 return; 2156 2157 if (event != ACPI_TABLE_EVENT_LOAD) 2158 return; 2159 2160 tew = kmalloc(sizeof(*tew), GFP_KERNEL); 2161 if (!tew) 2162 return; 2163 2164 INIT_WORK(&tew->work, acpi_table_events_fn); 2165 tew->table = table; 2166 tew->event = event; 2167 2168 schedule_work(&tew->work); 2169 } 2170 2171 int acpi_reconfig_notifier_register(struct notifier_block *nb) 2172 { 2173 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb); 2174 } 2175 EXPORT_SYMBOL(acpi_reconfig_notifier_register); 2176 2177 int acpi_reconfig_notifier_unregister(struct notifier_block *nb) 2178 { 2179 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb); 2180 } 2181 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister); 2182