1 // SPDX-License-Identifier: GPL-2.0-only
3 * scan.c - support for transforming the ACPI namespace into individual objects
6 #define pr_fmt(fmt) "ACPI: " fmt
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/slab.h>
11 #include <linux/kernel.h>
12 #include <linux/acpi.h>
13 #include <linux/acpi_iort.h>
14 #include <linux/acpi_viot.h>
15 #include <linux/iommu.h>
16 #include <linux/signal.h>
17 #include <linux/kthread.h>
18 #include <linux/dmi.h>
19 #include <linux/dma-map-ops.h>
20 #include <linux/platform_data/x86/apple.h>
21 #include <linux/pgtable.h>
22 #include <linux/crc32.h>
26 extern struct acpi_device *acpi_root;
28 #define ACPI_BUS_CLASS "system_bus"
29 #define ACPI_BUS_HID "LNXSYBUS"
30 #define ACPI_BUS_DEVICE_NAME "System Bus"
32 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
34 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
36 static const char *dummy_hid = "device";
38 static LIST_HEAD(acpi_dep_list);
39 static DEFINE_MUTEX(acpi_dep_list_lock);
40 LIST_HEAD(acpi_bus_id_list);
41 static DEFINE_MUTEX(acpi_scan_lock);
42 static LIST_HEAD(acpi_scan_handlers_list);
43 DEFINE_MUTEX(acpi_device_lock);
44 LIST_HEAD(acpi_wakeup_device_list);
45 static DEFINE_MUTEX(acpi_hp_context_lock);
48 * The UART device described by the SPCR table is the only object which needs
49 * special-casing. Everything else is covered by ACPI namespace paths in STAO
52 static u64 spcr_uart_addr;
54 void acpi_scan_lock_acquire(void)
56 mutex_lock(&acpi_scan_lock);
58 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
60 void acpi_scan_lock_release(void)
62 mutex_unlock(&acpi_scan_lock);
64 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
66 void acpi_lock_hp_context(void)
68 mutex_lock(&acpi_hp_context_lock);
71 void acpi_unlock_hp_context(void)
73 mutex_unlock(&acpi_hp_context_lock);
76 void acpi_initialize_hp_context(struct acpi_device *adev,
77 struct acpi_hotplug_context *hp,
78 int (*notify)(struct acpi_device *, u32),
79 void (*uevent)(struct acpi_device *, u32))
81 acpi_lock_hp_context();
84 acpi_set_hp_context(adev, hp);
85 acpi_unlock_hp_context();
87 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
89 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
94 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
98 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
99 const char *hotplug_profile_name)
103 error = acpi_scan_add_handler(handler);
107 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
111 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
113 struct acpi_device_physical_node *pn;
115 char *envp[] = { "EVENT=offline", NULL };
118 * acpi_container_offline() calls this for all of the container's
119 * children under the container's physical_node_lock lock.
121 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
123 list_for_each_entry(pn, &adev->physical_node_list, node)
124 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
126 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
132 mutex_unlock(&adev->physical_node_lock);
136 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
139 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
140 struct acpi_device_physical_node *pn;
141 bool second_pass = (bool)data;
142 acpi_status status = AE_OK;
147 if (device->handler && !device->handler->hotplug.enabled) {
148 *ret_p = &device->dev;
152 mutex_lock(&device->physical_node_lock);
154 list_for_each_entry(pn, &device->physical_node_list, node) {
158 /* Skip devices offlined by the first pass. */
162 pn->put_online = false;
164 ret = device_offline(pn->dev);
166 pn->put_online = !ret;
176 mutex_unlock(&device->physical_node_lock);
181 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
184 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
185 struct acpi_device_physical_node *pn;
190 mutex_lock(&device->physical_node_lock);
192 list_for_each_entry(pn, &device->physical_node_list, node)
193 if (pn->put_online) {
194 device_online(pn->dev);
195 pn->put_online = false;
198 mutex_unlock(&device->physical_node_lock);
203 static int acpi_scan_try_to_offline(struct acpi_device *device)
205 acpi_handle handle = device->handle;
206 struct device *errdev = NULL;
210 * Carry out two passes here and ignore errors in the first pass,
211 * because if the devices in question are memory blocks and
212 * CONFIG_MEMCG is set, one of the blocks may hold data structures
213 * that the other blocks depend on, but it is not known in advance which
216 * If the first pass is successful, the second one isn't needed, though.
218 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
219 NULL, acpi_bus_offline, (void *)false,
221 if (status == AE_SUPPORT) {
222 dev_warn(errdev, "Offline disabled.\n");
223 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
224 acpi_bus_online, NULL, NULL, NULL);
227 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
230 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
231 NULL, acpi_bus_offline, (void *)true,
234 acpi_bus_offline(handle, 0, (void *)true,
238 dev_warn(errdev, "Offline failed.\n");
239 acpi_bus_online(handle, 0, NULL, NULL);
240 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
241 ACPI_UINT32_MAX, acpi_bus_online,
249 static int acpi_scan_hot_remove(struct acpi_device *device)
251 acpi_handle handle = device->handle;
252 unsigned long long sta;
255 if (device->handler && device->handler->hotplug.demand_offline) {
256 if (!acpi_scan_is_offline(device, true))
259 int error = acpi_scan_try_to_offline(device);
264 acpi_handle_debug(handle, "Ejecting\n");
266 acpi_bus_trim(device);
268 acpi_evaluate_lck(handle, 0);
272 status = acpi_evaluate_ej0(handle);
273 if (status == AE_NOT_FOUND)
275 else if (ACPI_FAILURE(status))
279 * Verify if eject was indeed successful. If not, log an error
280 * message. No need to call _OST since _EJ0 call was made OK.
282 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
283 if (ACPI_FAILURE(status)) {
284 acpi_handle_warn(handle,
285 "Status check after eject failed (0x%x)\n", status);
286 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
287 acpi_handle_warn(handle,
288 "Eject incomplete - status 0x%llx\n", sta);
294 static int acpi_scan_device_not_present(struct acpi_device *adev)
296 if (!acpi_device_enumerated(adev)) {
297 dev_warn(&adev->dev, "Still not present\n");
304 static int acpi_scan_device_check(struct acpi_device *adev)
308 acpi_bus_get_status(adev);
309 if (adev->status.present || adev->status.functional) {
311 * This function is only called for device objects for which
312 * matching scan handlers exist. The only situation in which
313 * the scan handler is not attached to this device object yet
314 * is when the device has just appeared (either it wasn't
315 * present at all before or it was removed and then added
319 dev_warn(&adev->dev, "Already enumerated\n");
322 error = acpi_bus_scan(adev->handle);
324 dev_warn(&adev->dev, "Namespace scan failure\n");
327 if (!adev->handler) {
328 dev_warn(&adev->dev, "Enumeration failure\n");
332 error = acpi_scan_device_not_present(adev);
337 static int acpi_scan_bus_check(struct acpi_device *adev, void *not_used)
339 struct acpi_scan_handler *handler = adev->handler;
342 acpi_bus_get_status(adev);
343 if (!(adev->status.present || adev->status.functional)) {
344 acpi_scan_device_not_present(adev);
347 if (handler && handler->hotplug.scan_dependent)
348 return handler->hotplug.scan_dependent(adev);
350 error = acpi_bus_scan(adev->handle);
352 dev_warn(&adev->dev, "Namespace scan failure\n");
355 return acpi_dev_for_each_child(adev, acpi_scan_bus_check, NULL);
358 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
361 case ACPI_NOTIFY_BUS_CHECK:
362 return acpi_scan_bus_check(adev, NULL);
363 case ACPI_NOTIFY_DEVICE_CHECK:
364 return acpi_scan_device_check(adev);
365 case ACPI_NOTIFY_EJECT_REQUEST:
366 case ACPI_OST_EC_OSPM_EJECT:
367 if (adev->handler && !adev->handler->hotplug.enabled) {
368 dev_info(&adev->dev, "Eject disabled\n");
371 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
372 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
373 return acpi_scan_hot_remove(adev);
378 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
380 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
383 lock_device_hotplug();
384 mutex_lock(&acpi_scan_lock);
387 * The device object's ACPI handle cannot become invalid as long as we
388 * are holding acpi_scan_lock, but it might have become invalid before
389 * that lock was acquired.
391 if (adev->handle == INVALID_ACPI_HANDLE)
394 if (adev->flags.is_dock_station) {
395 error = dock_notify(adev, src);
396 } else if (adev->flags.hotplug_notify) {
397 error = acpi_generic_hotplug_event(adev, src);
399 int (*notify)(struct acpi_device *, u32);
401 acpi_lock_hp_context();
402 notify = adev->hp ? adev->hp->notify : NULL;
403 acpi_unlock_hp_context();
405 * There may be additional notify handlers for device objects
406 * without the .event() callback, so ignore them here.
409 error = notify(adev, src);
415 ost_code = ACPI_OST_SC_SUCCESS;
418 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
421 ost_code = ACPI_OST_SC_DEVICE_BUSY;
424 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
429 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
432 acpi_bus_put_acpi_device(adev);
433 mutex_unlock(&acpi_scan_lock);
434 unlock_device_hotplug();
437 static void acpi_free_power_resources_lists(struct acpi_device *device)
441 if (device->wakeup.flags.valid)
442 acpi_power_resources_list_free(&device->wakeup.resources);
444 if (!device->power.flags.power_resources)
447 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
448 struct acpi_device_power_state *ps = &device->power.states[i];
449 acpi_power_resources_list_free(&ps->resources);
453 static void acpi_device_release(struct device *dev)
455 struct acpi_device *acpi_dev = to_acpi_device(dev);
457 acpi_free_properties(acpi_dev);
458 acpi_free_pnp_ids(&acpi_dev->pnp);
459 acpi_free_power_resources_lists(acpi_dev);
463 static void acpi_device_del(struct acpi_device *device)
465 struct acpi_device_bus_id *acpi_device_bus_id;
467 mutex_lock(&acpi_device_lock);
469 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
470 if (!strcmp(acpi_device_bus_id->bus_id,
471 acpi_device_hid(device))) {
472 ida_free(&acpi_device_bus_id->instance_ida,
473 device->pnp.instance_no);
474 if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
475 list_del(&acpi_device_bus_id->node);
476 kfree_const(acpi_device_bus_id->bus_id);
477 kfree(acpi_device_bus_id);
482 list_del(&device->wakeup_list);
484 mutex_unlock(&acpi_device_lock);
486 acpi_power_add_remove_device(device, false);
487 acpi_device_remove_files(device);
489 device->remove(device);
491 device_del(&device->dev);
494 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
496 static LIST_HEAD(acpi_device_del_list);
497 static DEFINE_MUTEX(acpi_device_del_lock);
499 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
502 struct acpi_device *adev;
504 mutex_lock(&acpi_device_del_lock);
506 if (list_empty(&acpi_device_del_list)) {
507 mutex_unlock(&acpi_device_del_lock);
510 adev = list_first_entry(&acpi_device_del_list,
511 struct acpi_device, del_list);
512 list_del(&adev->del_list);
514 mutex_unlock(&acpi_device_del_lock);
516 blocking_notifier_call_chain(&acpi_reconfig_chain,
517 ACPI_RECONFIG_DEVICE_REMOVE, adev);
519 acpi_device_del(adev);
521 * Drop references to all power resources that might have been
522 * used by the device.
524 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
530 * acpi_scan_drop_device - Drop an ACPI device object.
531 * @handle: Handle of an ACPI namespace node, not used.
532 * @context: Address of the ACPI device object to drop.
534 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
535 * namespace node the device object pointed to by @context is attached to.
537 * The unregistration is carried out asynchronously to avoid running
538 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
539 * ensure the correct ordering (the device objects must be unregistered in the
540 * same order in which the corresponding namespace nodes are deleted).
542 static void acpi_scan_drop_device(acpi_handle handle, void *context)
544 static DECLARE_WORK(work, acpi_device_del_work_fn);
545 struct acpi_device *adev = context;
547 mutex_lock(&acpi_device_del_lock);
550 * Use the ACPI hotplug workqueue which is ordered, so this work item
551 * won't run after any hotplug work items submitted subsequently. That
552 * prevents attempts to register device objects identical to those being
553 * deleted from happening concurrently (such attempts result from
554 * hotplug events handled via the ACPI hotplug workqueue). It also will
555 * run after all of the work items submitted previously, which helps
556 * those work items to ensure that they are not accessing stale device
559 if (list_empty(&acpi_device_del_list))
560 acpi_queue_hotplug_work(&work);
562 list_add_tail(&adev->del_list, &acpi_device_del_list);
563 /* Make acpi_ns_validate_handle() return NULL for this handle. */
564 adev->handle = INVALID_ACPI_HANDLE;
566 mutex_unlock(&acpi_device_del_lock);
569 static struct acpi_device *handle_to_device(acpi_handle handle,
570 void (*callback)(void *))
572 struct acpi_device *adev = NULL;
575 status = acpi_get_data_full(handle, acpi_scan_drop_device,
576 (void **)&adev, callback);
577 if (ACPI_FAILURE(status) || !adev) {
578 acpi_handle_debug(handle, "No context!\n");
585 * acpi_fetch_acpi_dev - Retrieve ACPI device object.
586 * @handle: ACPI handle associated with the requested ACPI device object.
588 * Return a pointer to the ACPI device object associated with @handle, if
589 * present, or NULL otherwise.
591 struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)
593 return handle_to_device(handle, NULL);
595 EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);
597 static void get_acpi_device(void *dev)
602 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
604 return handle_to_device(handle, get_acpi_device);
606 EXPORT_SYMBOL_GPL(acpi_bus_get_acpi_device);
608 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
610 struct acpi_device_bus_id *acpi_device_bus_id;
612 /* Find suitable bus_id and instance number in acpi_bus_id_list. */
613 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
614 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
615 return acpi_device_bus_id;
620 static int acpi_device_set_name(struct acpi_device *device,
621 struct acpi_device_bus_id *acpi_device_bus_id)
623 struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
626 result = ida_alloc(instance_ida, GFP_KERNEL);
630 device->pnp.instance_no = result;
631 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
635 static int acpi_tie_acpi_dev(struct acpi_device *adev)
637 acpi_handle handle = adev->handle;
643 status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
644 if (ACPI_FAILURE(status)) {
645 acpi_handle_err(handle, "Unable to attach device data\n");
652 static void acpi_store_pld_crc(struct acpi_device *adev)
654 struct acpi_pld_info *pld;
657 status = acpi_get_physical_device_location(adev->handle, &pld);
658 if (ACPI_FAILURE(status))
661 adev->pld_crc = crc32(~0, pld, sizeof(*pld));
665 static int __acpi_device_add(struct acpi_device *device,
666 void (*release)(struct device *))
668 struct acpi_device_bus_id *acpi_device_bus_id;
674 * Link this device to its parent and siblings.
676 INIT_LIST_HEAD(&device->wakeup_list);
677 INIT_LIST_HEAD(&device->physical_node_list);
678 INIT_LIST_HEAD(&device->del_list);
679 mutex_init(&device->physical_node_lock);
681 mutex_lock(&acpi_device_lock);
683 acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
684 if (acpi_device_bus_id) {
685 result = acpi_device_set_name(device, acpi_device_bus_id);
689 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
691 if (!acpi_device_bus_id) {
695 acpi_device_bus_id->bus_id =
696 kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
697 if (!acpi_device_bus_id->bus_id) {
698 kfree(acpi_device_bus_id);
703 ida_init(&acpi_device_bus_id->instance_ida);
705 result = acpi_device_set_name(device, acpi_device_bus_id);
707 kfree_const(acpi_device_bus_id->bus_id);
708 kfree(acpi_device_bus_id);
712 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
715 if (device->wakeup.flags.valid)
716 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
718 acpi_store_pld_crc(device);
720 mutex_unlock(&acpi_device_lock);
723 device->dev.parent = &device->parent->dev;
725 device->dev.bus = &acpi_bus_type;
726 device->dev.release = release;
727 result = device_add(&device->dev);
729 dev_err(&device->dev, "Error registering device\n");
733 result = acpi_device_setup_files(device);
735 pr_err("Error creating sysfs interface for device %s\n",
736 dev_name(&device->dev));
741 mutex_lock(&acpi_device_lock);
743 list_del(&device->wakeup_list);
746 mutex_unlock(&acpi_device_lock);
748 acpi_detach_data(device->handle, acpi_scan_drop_device);
753 int acpi_device_add(struct acpi_device *adev, void (*release)(struct device *))
757 ret = acpi_tie_acpi_dev(adev);
761 return __acpi_device_add(adev, release);
764 /* --------------------------------------------------------------------------
766 -------------------------------------------------------------------------- */
767 static bool acpi_info_matches_ids(struct acpi_device_info *info,
768 const char * const ids[])
770 struct acpi_pnp_device_id_list *cid_list = NULL;
773 if (!(info->valid & ACPI_VALID_HID))
776 index = match_string(ids, -1, info->hardware_id.string);
780 if (info->valid & ACPI_VALID_CID)
781 cid_list = &info->compatible_id_list;
786 for (i = 0; i < cid_list->count; i++) {
787 index = match_string(ids, -1, cid_list->ids[i].string);
795 /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
796 static const char * const acpi_ignore_dep_ids[] = {
797 "PNP0D80", /* Windows-compatible System Power Management Controller */
798 "INT33BD", /* Intel Baytrail Mailbox Device */
802 /* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */
803 static const char * const acpi_honor_dep_ids[] = {
804 "INT3472", /* Camera sensor PMIC / clk and regulator info */
808 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
810 struct acpi_device *device;
814 * Fixed hardware devices do not appear in the namespace and do not
815 * have handles, but we fabricate acpi_devices for them, so we have
816 * to deal with them specially.
822 status = acpi_get_parent(handle, &handle);
823 if (ACPI_FAILURE(status))
824 return status == AE_NULL_ENTRY ? NULL : acpi_root;
826 device = acpi_fetch_acpi_dev(handle);
832 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
836 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
837 union acpi_object *obj;
839 status = acpi_get_handle(handle, "_EJD", &tmp);
840 if (ACPI_FAILURE(status))
843 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
844 if (ACPI_SUCCESS(status)) {
845 obj = buffer.pointer;
846 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
848 kfree(buffer.pointer);
852 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
854 static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
856 acpi_handle handle = dev->handle;
857 struct acpi_device_wakeup *wakeup = &dev->wakeup;
858 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
859 union acpi_object *package = NULL;
860 union acpi_object *element = NULL;
864 INIT_LIST_HEAD(&wakeup->resources);
867 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
868 if (ACPI_FAILURE(status)) {
869 acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
870 acpi_format_exception(status));
874 package = (union acpi_object *)buffer.pointer;
876 if (!package || package->package.count < 2)
879 element = &(package->package.elements[0]);
883 if (element->type == ACPI_TYPE_PACKAGE) {
884 if ((element->package.count < 2) ||
885 (element->package.elements[0].type !=
886 ACPI_TYPE_LOCAL_REFERENCE)
887 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
891 element->package.elements[0].reference.handle;
893 (u32) element->package.elements[1].integer.value;
894 } else if (element->type == ACPI_TYPE_INTEGER) {
895 wakeup->gpe_device = NULL;
896 wakeup->gpe_number = element->integer.value;
901 element = &(package->package.elements[1]);
902 if (element->type != ACPI_TYPE_INTEGER)
905 wakeup->sleep_state = element->integer.value;
907 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
911 if (!list_empty(&wakeup->resources)) {
914 err = acpi_power_wakeup_list_init(&wakeup->resources,
917 acpi_handle_warn(handle, "Retrieving current states "
918 "of wakeup power resources failed\n");
919 acpi_power_resources_list_free(&wakeup->resources);
922 if (sleep_state < wakeup->sleep_state) {
923 acpi_handle_warn(handle, "Overriding _PRW sleep state "
924 "(S%d) by S%d from power resources\n",
925 (int)wakeup->sleep_state, sleep_state);
926 wakeup->sleep_state = sleep_state;
931 kfree(buffer.pointer);
935 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
937 static const struct acpi_device_id button_device_ids[] = {
938 {"PNP0C0C", 0}, /* Power button */
939 {"PNP0C0D", 0}, /* Lid */
940 {"PNP0C0E", 0}, /* Sleep button */
943 struct acpi_device_wakeup *wakeup = &device->wakeup;
946 wakeup->flags.notifier_present = 0;
948 /* Power button, Lid switch always enable wakeup */
949 if (!acpi_match_device_ids(device, button_device_ids)) {
950 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
951 /* Do not use Lid/sleep button for S5 wakeup */
952 if (wakeup->sleep_state == ACPI_STATE_S5)
953 wakeup->sleep_state = ACPI_STATE_S4;
955 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
956 device_set_wakeup_capable(&device->dev, true);
960 status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
962 return ACPI_SUCCESS(status);
965 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
969 /* Presence of _PRW indicates wake capable */
970 if (!acpi_has_method(device->handle, "_PRW"))
973 err = acpi_bus_extract_wakeup_device_power_package(device);
975 dev_err(&device->dev, "Unable to extract wakeup power resources");
979 device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
980 device->wakeup.prepare_count = 0;
982 * Call _PSW/_DSW object to disable its ability to wake the sleeping
983 * system for the ACPI device with the _PRW object.
984 * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
985 * So it is necessary to call _DSW object first. Only when it is not
986 * present will the _PSW object used.
988 err = acpi_device_sleep_wake(device, 0, 0, 0);
990 pr_debug("error in _DSW or _PSW evaluation\n");
993 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
995 struct acpi_device_power_state *ps = &device->power.states[state];
996 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
997 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1000 INIT_LIST_HEAD(&ps->resources);
1002 /* Evaluate "_PRx" to get referenced power resources */
1003 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1004 if (ACPI_SUCCESS(status)) {
1005 union acpi_object *package = buffer.pointer;
1007 if (buffer.length && package
1008 && package->type == ACPI_TYPE_PACKAGE
1009 && package->package.count)
1010 acpi_extract_power_resources(package, 0, &ps->resources);
1012 ACPI_FREE(buffer.pointer);
1015 /* Evaluate "_PSx" to see if we can do explicit sets */
1017 if (acpi_has_method(device->handle, pathname))
1018 ps->flags.explicit_set = 1;
1020 /* State is valid if there are means to put the device into it. */
1021 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
1022 ps->flags.valid = 1;
1024 ps->power = -1; /* Unknown - driver assigned */
1025 ps->latency = -1; /* Unknown - driver assigned */
1028 static void acpi_bus_get_power_flags(struct acpi_device *device)
1030 unsigned long long dsc = ACPI_STATE_D0;
1033 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1034 if (!acpi_has_method(device->handle, "_PS0") &&
1035 !acpi_has_method(device->handle, "_PR0"))
1038 device->flags.power_manageable = 1;
1041 * Power Management Flags
1043 if (acpi_has_method(device->handle, "_PSC"))
1044 device->power.flags.explicit_get = 1;
1046 if (acpi_has_method(device->handle, "_IRC"))
1047 device->power.flags.inrush_current = 1;
1049 if (acpi_has_method(device->handle, "_DSW"))
1050 device->power.flags.dsw_present = 1;
1052 acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc);
1053 device->power.state_for_enumeration = dsc;
1056 * Enumerate supported power management states
1058 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1059 acpi_bus_init_power_state(device, i);
1061 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1063 /* Set the defaults for D0 and D3hot (always supported). */
1064 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1065 device->power.states[ACPI_STATE_D0].power = 100;
1066 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1069 * Use power resources only if the D0 list of them is populated, because
1070 * some platforms may provide _PR3 only to indicate D3cold support and
1071 * in those cases the power resources list returned by it may be bogus.
1073 if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1074 device->power.flags.power_resources = 1;
1076 * D3cold is supported if the D3hot list of power resources is
1079 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1080 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1083 if (acpi_bus_init_power(device))
1084 device->flags.power_manageable = 0;
1087 static void acpi_bus_get_flags(struct acpi_device *device)
1089 /* Presence of _STA indicates 'dynamic_status' */
1090 if (acpi_has_method(device->handle, "_STA"))
1091 device->flags.dynamic_status = 1;
1093 /* Presence of _RMV indicates 'removable' */
1094 if (acpi_has_method(device->handle, "_RMV"))
1095 device->flags.removable = 1;
1097 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1098 if (acpi_has_method(device->handle, "_EJD") ||
1099 acpi_has_method(device->handle, "_EJ0"))
1100 device->flags.ejectable = 1;
1103 static void acpi_device_get_busid(struct acpi_device *device)
1105 char bus_id[5] = { '?', 0 };
1106 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1112 * The device's Bus ID is simply the object name.
1113 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1115 if (ACPI_IS_ROOT_DEVICE(device)) {
1116 strcpy(device->pnp.bus_id, "ACPI");
1120 switch (device->device_type) {
1121 case ACPI_BUS_TYPE_POWER_BUTTON:
1122 strcpy(device->pnp.bus_id, "PWRF");
1124 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1125 strcpy(device->pnp.bus_id, "SLPF");
1127 case ACPI_BUS_TYPE_ECDT_EC:
1128 strcpy(device->pnp.bus_id, "ECDT");
1131 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1132 /* Clean up trailing underscores (if any) */
1133 for (i = 3; i > 1; i--) {
1134 if (bus_id[i] == '_')
1139 strcpy(device->pnp.bus_id, bus_id);
1145 * acpi_ata_match - see if an acpi object is an ATA device
1147 * If an acpi object has one of the ACPI ATA methods defined,
1148 * then we can safely call it an ATA device.
1150 bool acpi_ata_match(acpi_handle handle)
1152 return acpi_has_method(handle, "_GTF") ||
1153 acpi_has_method(handle, "_GTM") ||
1154 acpi_has_method(handle, "_STM") ||
1155 acpi_has_method(handle, "_SDD");
1159 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1161 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1162 * then we can safely call it an ejectable drive bay
1164 bool acpi_bay_match(acpi_handle handle)
1166 acpi_handle phandle;
1168 if (!acpi_has_method(handle, "_EJ0"))
1170 if (acpi_ata_match(handle))
1172 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1175 return acpi_ata_match(phandle);
1178 bool acpi_device_is_battery(struct acpi_device *adev)
1180 struct acpi_hardware_id *hwid;
1182 list_for_each_entry(hwid, &adev->pnp.ids, list)
1183 if (!strcmp("PNP0C0A", hwid->id))
1189 static bool is_ejectable_bay(struct acpi_device *adev)
1191 acpi_handle handle = adev->handle;
1193 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1196 return acpi_bay_match(handle);
1200 * acpi_dock_match - see if an acpi object has a _DCK method
1202 bool acpi_dock_match(acpi_handle handle)
1204 return acpi_has_method(handle, "_DCK");
1208 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1209 void **return_value)
1211 long *cap = context;
1213 if (acpi_has_method(handle, "_BCM") &&
1214 acpi_has_method(handle, "_BCL")) {
1215 acpi_handle_debug(handle, "Found generic backlight support\n");
1216 *cap |= ACPI_VIDEO_BACKLIGHT;
1217 /* We have backlight support, no need to scan further */
1218 return AE_CTRL_TERMINATE;
1223 /* Returns true if the ACPI object is a video device which can be
1224 * handled by video.ko.
1225 * The device will get a Linux specific CID added in scan.c to
1226 * identify the device as an ACPI graphics device
1227 * Be aware that the graphics device may not be physically present
1228 * Use acpi_video_get_capabilities() to detect general ACPI video
1229 * capabilities of present cards
1231 long acpi_is_video_device(acpi_handle handle)
1233 long video_caps = 0;
1235 /* Is this device able to support video switching ? */
1236 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1237 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1239 /* Is this device able to retrieve a video ROM ? */
1240 if (acpi_has_method(handle, "_ROM"))
1241 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1243 /* Is this device able to configure which video head to be POSTed ? */
1244 if (acpi_has_method(handle, "_VPO") &&
1245 acpi_has_method(handle, "_GPD") &&
1246 acpi_has_method(handle, "_SPD"))
1247 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1249 /* Only check for backlight functionality if one of the above hit. */
1251 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1252 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1257 EXPORT_SYMBOL(acpi_is_video_device);
1259 const char *acpi_device_hid(struct acpi_device *device)
1261 struct acpi_hardware_id *hid;
1263 if (list_empty(&device->pnp.ids))
1266 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1269 EXPORT_SYMBOL(acpi_device_hid);
1271 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1273 struct acpi_hardware_id *id;
1275 id = kmalloc(sizeof(*id), GFP_KERNEL);
1279 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1285 list_add_tail(&id->list, &pnp->ids);
1286 pnp->type.hardware_id = 1;
1290 * Old IBM workstations have a DSDT bug wherein the SMBus object
1291 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1292 * prefix. Work around this.
1294 static bool acpi_ibm_smbus_match(acpi_handle handle)
1296 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1297 struct acpi_buffer path = { sizeof(node_name), node_name };
1299 if (!dmi_name_in_vendors("IBM"))
1302 /* Look for SMBS object */
1303 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1304 strcmp("SMBS", path.pointer))
1307 /* Does it have the necessary (but misnamed) methods? */
1308 if (acpi_has_method(handle, "SBI") &&
1309 acpi_has_method(handle, "SBR") &&
1310 acpi_has_method(handle, "SBW"))
1316 static bool acpi_object_is_system_bus(acpi_handle handle)
1320 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1323 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1330 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1333 struct acpi_device_info *info = NULL;
1334 struct acpi_pnp_device_id_list *cid_list;
1337 switch (device_type) {
1338 case ACPI_BUS_TYPE_DEVICE:
1339 if (handle == ACPI_ROOT_OBJECT) {
1340 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1344 acpi_get_object_info(handle, &info);
1346 pr_err("%s: Error reading device info\n", __func__);
1350 if (info->valid & ACPI_VALID_HID) {
1351 acpi_add_id(pnp, info->hardware_id.string);
1352 pnp->type.platform_id = 1;
1354 if (info->valid & ACPI_VALID_CID) {
1355 cid_list = &info->compatible_id_list;
1356 for (i = 0; i < cid_list->count; i++)
1357 acpi_add_id(pnp, cid_list->ids[i].string);
1359 if (info->valid & ACPI_VALID_ADR) {
1360 pnp->bus_address = info->address;
1361 pnp->type.bus_address = 1;
1363 if (info->valid & ACPI_VALID_UID)
1364 pnp->unique_id = kstrdup(info->unique_id.string,
1366 if (info->valid & ACPI_VALID_CLS)
1367 acpi_add_id(pnp, info->class_code.string);
1372 * Some devices don't reliably have _HIDs & _CIDs, so add
1373 * synthetic HIDs to make sure drivers can find them.
1375 if (acpi_is_video_device(handle))
1376 acpi_add_id(pnp, ACPI_VIDEO_HID);
1377 else if (acpi_bay_match(handle))
1378 acpi_add_id(pnp, ACPI_BAY_HID);
1379 else if (acpi_dock_match(handle))
1380 acpi_add_id(pnp, ACPI_DOCK_HID);
1381 else if (acpi_ibm_smbus_match(handle))
1382 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1383 else if (list_empty(&pnp->ids) &&
1384 acpi_object_is_system_bus(handle)) {
1385 /* \_SB, \_TZ, LNXSYBUS */
1386 acpi_add_id(pnp, ACPI_BUS_HID);
1387 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1388 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1392 case ACPI_BUS_TYPE_POWER:
1393 acpi_add_id(pnp, ACPI_POWER_HID);
1395 case ACPI_BUS_TYPE_PROCESSOR:
1396 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1398 case ACPI_BUS_TYPE_THERMAL:
1399 acpi_add_id(pnp, ACPI_THERMAL_HID);
1401 case ACPI_BUS_TYPE_POWER_BUTTON:
1402 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1404 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1405 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1407 case ACPI_BUS_TYPE_ECDT_EC:
1408 acpi_add_id(pnp, ACPI_ECDT_HID);
1413 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1415 struct acpi_hardware_id *id, *tmp;
1417 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1418 kfree_const(id->id);
1421 kfree(pnp->unique_id);
1425 * acpi_dma_supported - Check DMA support for the specified device.
1426 * @adev: The pointer to acpi device
1428 * Return false if DMA is not supported. Otherwise, return true
1430 bool acpi_dma_supported(const struct acpi_device *adev)
1435 if (adev->flags.cca_seen)
1439 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1440 * DMA on "Intel platforms". Presumably that includes all x86 and
1441 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1443 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1450 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1451 * @adev: The pointer to acpi device
1453 * Return enum dev_dma_attr.
1455 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1457 if (!acpi_dma_supported(adev))
1458 return DEV_DMA_NOT_SUPPORTED;
1460 if (adev->flags.coherent_dma)
1461 return DEV_DMA_COHERENT;
1463 return DEV_DMA_NON_COHERENT;
1467 * acpi_dma_get_range() - Get device DMA parameters.
1469 * @dev: device to configure
1470 * @dma_addr: pointer device DMA address result
1471 * @offset: pointer to the DMA offset result
1472 * @size: pointer to DMA range size result
1474 * Evaluate DMA regions and return respectively DMA region start, offset
1475 * and size in dma_addr, offset and size on parsing success; it does not
1476 * update the passed in values on failure.
1478 * Return 0 on success, < 0 on failure.
1480 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1483 struct acpi_device *adev;
1485 struct resource_entry *rentry;
1487 struct device *dma_dev = dev;
1488 u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1491 * Walk the device tree chasing an ACPI companion with a _DMA
1492 * object while we go. Stop if we find a device with an ACPI
1493 * companion containing a _DMA method.
1496 adev = ACPI_COMPANION(dma_dev);
1497 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1500 dma_dev = dma_dev->parent;
1506 if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1507 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1511 ret = acpi_dev_get_dma_resources(adev, &list);
1513 list_for_each_entry(rentry, &list, node) {
1514 if (dma_offset && rentry->offset != dma_offset) {
1516 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1519 dma_offset = rentry->offset;
1521 /* Take lower and upper limits */
1522 if (rentry->res->start < dma_start)
1523 dma_start = rentry->res->start;
1524 if (rentry->res->end > dma_end)
1525 dma_end = rentry->res->end;
1528 if (dma_start >= dma_end) {
1530 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1534 *dma_addr = dma_start - dma_offset;
1535 len = dma_end - dma_start;
1536 *size = max(len, len + 1);
1537 *offset = dma_offset;
1540 acpi_dev_free_resource_list(&list);
1542 return ret >= 0 ? 0 : ret;
1545 #ifdef CONFIG_IOMMU_API
1546 int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1547 struct fwnode_handle *fwnode,
1548 const struct iommu_ops *ops)
1550 int ret = iommu_fwspec_init(dev, fwnode, ops);
1553 ret = iommu_fwspec_add_ids(dev, &id, 1);
1558 static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
1560 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1562 return fwspec ? fwspec->ops : NULL;
1565 static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
1569 const struct iommu_ops *ops;
1572 * If we already translated the fwspec there is nothing left to do,
1573 * return the iommu_ops.
1575 ops = acpi_iommu_fwspec_ops(dev);
1579 err = iort_iommu_configure_id(dev, id_in);
1580 if (err && err != -EPROBE_DEFER)
1581 err = viot_iommu_configure(dev);
1584 * If we have reason to believe the IOMMU driver missed the initial
1585 * iommu_probe_device() call for dev, replay it to get things in order.
1587 if (!err && dev->bus && !device_iommu_mapped(dev))
1588 err = iommu_probe_device(dev);
1590 /* Ignore all other errors apart from EPROBE_DEFER */
1591 if (err == -EPROBE_DEFER) {
1592 return ERR_PTR(err);
1594 dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
1597 return acpi_iommu_fwspec_ops(dev);
1600 #else /* !CONFIG_IOMMU_API */
1602 int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1603 struct fwnode_handle *fwnode,
1604 const struct iommu_ops *ops)
1609 static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
1615 #endif /* !CONFIG_IOMMU_API */
1618 * acpi_dma_configure_id - Set-up DMA configuration for the device.
1619 * @dev: The pointer to the device
1620 * @attr: device dma attributes
1621 * @input_id: input device id const value pointer
1623 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1624 const u32 *input_id)
1626 const struct iommu_ops *iommu;
1627 u64 dma_addr = 0, size = 0;
1629 if (attr == DEV_DMA_NOT_SUPPORTED) {
1630 set_dma_ops(dev, &dma_dummy_ops);
1634 acpi_arch_dma_setup(dev, &dma_addr, &size);
1636 iommu = acpi_iommu_configure_id(dev, input_id);
1637 if (PTR_ERR(iommu) == -EPROBE_DEFER)
1638 return -EPROBE_DEFER;
1640 arch_setup_dma_ops(dev, dma_addr, size,
1641 iommu, attr == DEV_DMA_COHERENT);
1645 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1647 static void acpi_init_coherency(struct acpi_device *adev)
1649 unsigned long long cca = 0;
1651 struct acpi_device *parent = adev->parent;
1653 if (parent && parent->flags.cca_seen) {
1655 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1658 adev->flags.cca_seen = 1;
1659 cca = parent->flags.coherent_dma;
1661 status = acpi_evaluate_integer(adev->handle, "_CCA",
1663 if (ACPI_SUCCESS(status))
1664 adev->flags.cca_seen = 1;
1665 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1667 * If architecture does not specify that _CCA is
1668 * required for DMA-able devices (e.g. x86),
1669 * we default to _CCA=1.
1673 acpi_handle_debug(adev->handle,
1674 "ACPI device is missing _CCA.\n");
1677 adev->flags.coherent_dma = cca;
1680 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1682 bool *is_serial_bus_slave_p = data;
1684 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1687 *is_serial_bus_slave_p = true;
1689 /* no need to do more checking */
1693 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1695 struct acpi_device *parent = device->parent;
1696 static const struct acpi_device_id indirect_io_hosts[] = {
1701 return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1704 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1706 struct list_head resource_list;
1707 bool is_serial_bus_slave = false;
1708 static const struct acpi_device_id ignore_serial_bus_ids[] = {
1710 * These devices have multiple SerialBus resources and a client
1711 * device must be instantiated for each of them, each with
1712 * its own device id.
1713 * Normally we only instantiate one client device for the first
1714 * resource, using the ACPI HID as id. These special cases are handled
1715 * by the drivers/platform/x86/serial-multi-instantiate.c driver, which
1716 * knows which client device id to use for each resource.
1723 /* Non-conforming _HID for Cirrus Logic already released */
1727 * Some ACPI devs contain SerialBus resources even though they are not
1728 * attached to a serial bus at all.
1732 * HIDs of device with an UartSerialBusV2 resource for which userspace
1733 * expects a regular tty cdev to be created (instead of the in kernel
1734 * serdev) and which have a kernel driver which expects a platform_dev
1735 * such as the rfkill-gpio driver.
1742 if (acpi_is_indirect_io_slave(device))
1745 /* Macs use device properties in lieu of _CRS resources */
1746 if (x86_apple_machine &&
1747 (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1748 fwnode_property_present(&device->fwnode, "i2cAddress") ||
1749 fwnode_property_present(&device->fwnode, "baud")))
1752 if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
1755 INIT_LIST_HEAD(&resource_list);
1756 acpi_dev_get_resources(device, &resource_list,
1757 acpi_check_serial_bus_slave,
1758 &is_serial_bus_slave);
1759 acpi_dev_free_resource_list(&resource_list);
1761 return is_serial_bus_slave;
1764 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1767 INIT_LIST_HEAD(&device->pnp.ids);
1768 device->device_type = type;
1769 device->handle = handle;
1770 device->parent = acpi_bus_get_parent(handle);
1771 fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1772 acpi_set_device_status(device, ACPI_STA_DEFAULT);
1773 acpi_device_get_busid(device);
1774 acpi_set_pnp_ids(handle, &device->pnp, type);
1775 acpi_init_properties(device);
1776 acpi_bus_get_flags(device);
1777 device->flags.match_driver = false;
1778 device->flags.initialized = true;
1779 device->flags.enumeration_by_parent =
1780 acpi_device_enumeration_by_parent(device);
1781 acpi_device_clear_enumerated(device);
1782 device_initialize(&device->dev);
1783 dev_set_uevent_suppress(&device->dev, true);
1784 acpi_init_coherency(device);
1787 static void acpi_scan_dep_init(struct acpi_device *adev)
1789 struct acpi_dep_data *dep;
1791 list_for_each_entry(dep, &acpi_dep_list, node) {
1792 if (dep->consumer == adev->handle) {
1794 adev->flags.honor_deps = 1;
1801 void acpi_device_add_finalize(struct acpi_device *device)
1803 dev_set_uevent_suppress(&device->dev, false);
1804 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1807 static void acpi_scan_init_status(struct acpi_device *adev)
1809 if (acpi_bus_get_status(adev))
1810 acpi_set_device_status(adev, 0);
1813 static int acpi_add_single_object(struct acpi_device **child,
1814 acpi_handle handle, int type, bool dep_init)
1816 struct acpi_device *device;
1817 bool release_dep_lock = false;
1820 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1824 acpi_init_device_object(device, handle, type);
1826 * Getting the status is delayed till here so that we can call
1827 * acpi_bus_get_status() and use its quirk handling. Note that
1828 * this must be done before the get power-/wakeup_dev-flags calls.
1830 if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
1832 mutex_lock(&acpi_dep_list_lock);
1834 * Hold the lock until the acpi_tie_acpi_dev() call
1835 * below to prevent concurrent acpi_scan_clear_dep()
1836 * from deleting a dependency list entry without
1837 * updating dep_unmet for the device.
1839 release_dep_lock = true;
1840 acpi_scan_dep_init(device);
1842 acpi_scan_init_status(device);
1845 acpi_bus_get_power_flags(device);
1846 acpi_bus_get_wakeup_device_flags(device);
1848 result = acpi_tie_acpi_dev(device);
1850 if (release_dep_lock)
1851 mutex_unlock(&acpi_dep_list_lock);
1854 result = __acpi_device_add(device, acpi_device_release);
1857 acpi_device_release(&device->dev);
1861 acpi_power_add_remove_device(device, true);
1862 acpi_device_add_finalize(device);
1864 acpi_handle_debug(handle, "Added as %s, parent %s\n",
1865 dev_name(&device->dev), device->parent ?
1866 dev_name(&device->parent->dev) : "(null)");
1872 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1875 struct resource *res = context;
1877 if (acpi_dev_resource_memory(ares, res))
1878 return AE_CTRL_TERMINATE;
1883 static bool acpi_device_should_be_hidden(acpi_handle handle)
1886 struct resource res;
1888 /* Check if it should ignore the UART device */
1889 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1893 * The UART device described in SPCR table is assumed to have only one
1894 * memory resource present. So we only look for the first one here.
1896 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1897 acpi_get_resource_memory, &res);
1898 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1901 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1907 bool acpi_device_is_present(const struct acpi_device *adev)
1909 return adev->status.present || adev->status.functional;
1912 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1914 const struct acpi_device_id **matchid)
1916 const struct acpi_device_id *devid;
1919 return handler->match(idstr, matchid);
1921 for (devid = handler->ids; devid->id[0]; devid++)
1922 if (!strcmp((char *)devid->id, idstr)) {
1932 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1933 const struct acpi_device_id **matchid)
1935 struct acpi_scan_handler *handler;
1937 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1938 if (acpi_scan_handler_matching(handler, idstr, matchid))
1944 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1946 if (!!hotplug->enabled == !!val)
1949 mutex_lock(&acpi_scan_lock);
1951 hotplug->enabled = val;
1953 mutex_unlock(&acpi_scan_lock);
1956 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1958 struct acpi_hardware_id *hwid;
1960 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1961 acpi_dock_add(adev);
1964 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1965 struct acpi_scan_handler *handler;
1967 handler = acpi_scan_match_handler(hwid->id, NULL);
1969 adev->flags.hotplug_notify = true;
1975 static u32 acpi_scan_check_dep(acpi_handle handle, bool check_dep)
1977 struct acpi_handle_list dep_devices;
1983 * Check for _HID here to avoid deferring the enumeration of:
1985 * 2. ACPI nodes describing USB ports.
1986 * Still, checking for _HID catches more then just these cases ...
1988 if (!check_dep || !acpi_has_method(handle, "_DEP") ||
1989 !acpi_has_method(handle, "_HID"))
1992 status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices);
1993 if (ACPI_FAILURE(status)) {
1994 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
1998 for (count = 0, i = 0; i < dep_devices.count; i++) {
1999 struct acpi_device_info *info;
2000 struct acpi_dep_data *dep;
2001 bool skip, honor_dep;
2003 status = acpi_get_object_info(dep_devices.handles[i], &info);
2004 if (ACPI_FAILURE(status)) {
2005 acpi_handle_debug(handle, "Error reading _DEP device info\n");
2009 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
2010 honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids);
2016 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
2022 dep->supplier = dep_devices.handles[i];
2023 dep->consumer = handle;
2024 dep->honor_dep = honor_dep;
2026 mutex_lock(&acpi_dep_list_lock);
2027 list_add_tail(&dep->node , &acpi_dep_list);
2028 mutex_unlock(&acpi_dep_list_lock);
2034 static bool acpi_bus_scan_second_pass;
2036 static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep,
2037 struct acpi_device **adev_p)
2039 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
2040 acpi_object_type acpi_type;
2046 if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
2049 switch (acpi_type) {
2050 case ACPI_TYPE_DEVICE:
2051 if (acpi_device_should_be_hidden(handle))
2054 /* Bail out if there are dependencies. */
2055 if (acpi_scan_check_dep(handle, check_dep) > 0) {
2056 acpi_bus_scan_second_pass = true;
2057 return AE_CTRL_DEPTH;
2061 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
2062 type = ACPI_BUS_TYPE_DEVICE;
2065 case ACPI_TYPE_PROCESSOR:
2066 type = ACPI_BUS_TYPE_PROCESSOR;
2069 case ACPI_TYPE_THERMAL:
2070 type = ACPI_BUS_TYPE_THERMAL;
2073 case ACPI_TYPE_POWER:
2074 acpi_add_power_resource(handle);
2081 * If check_dep is true at this point, the device has no dependencies,
2082 * or the creation of the device object would have been postponed above.
2084 acpi_add_single_object(&device, handle, type, !check_dep);
2086 return AE_CTRL_DEPTH;
2088 acpi_scan_init_hotplug(device);
2097 static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
2098 void *not_used, void **ret_p)
2100 return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
2103 static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
2104 void *not_used, void **ret_p)
2106 return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
2109 static void acpi_default_enumeration(struct acpi_device *device)
2112 * Do not enumerate devices with enumeration_by_parent flag set as
2113 * they will be enumerated by their respective parents.
2115 if (!device->flags.enumeration_by_parent) {
2116 acpi_create_platform_device(device, NULL);
2117 acpi_device_set_enumerated(device);
2119 blocking_notifier_call_chain(&acpi_reconfig_chain,
2120 ACPI_RECONFIG_DEVICE_ADD, device);
2124 static const struct acpi_device_id generic_device_ids[] = {
2125 {ACPI_DT_NAMESPACE_HID, },
2129 static int acpi_generic_device_attach(struct acpi_device *adev,
2130 const struct acpi_device_id *not_used)
2133 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2134 * below can be unconditional.
2136 if (adev->data.of_compatible)
2137 acpi_default_enumeration(adev);
2142 static struct acpi_scan_handler generic_device_handler = {
2143 .ids = generic_device_ids,
2144 .attach = acpi_generic_device_attach,
2147 static int acpi_scan_attach_handler(struct acpi_device *device)
2149 struct acpi_hardware_id *hwid;
2152 list_for_each_entry(hwid, &device->pnp.ids, list) {
2153 const struct acpi_device_id *devid;
2154 struct acpi_scan_handler *handler;
2156 handler = acpi_scan_match_handler(hwid->id, &devid);
2158 if (!handler->attach) {
2159 device->pnp.type.platform_id = 0;
2162 device->handler = handler;
2163 ret = handler->attach(device, devid);
2167 device->handler = NULL;
2176 static int acpi_bus_attach(struct acpi_device *device, void *first_pass)
2178 bool skip = !first_pass && device->flags.visited;
2185 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2186 register_dock_dependent_device(device, ejd);
2188 acpi_bus_get_status(device);
2189 /* Skip devices that are not ready for enumeration (e.g. not present) */
2190 if (!acpi_dev_ready_for_enumeration(device)) {
2191 device->flags.initialized = false;
2192 acpi_device_clear_enumerated(device);
2193 device->flags.power_manageable = 0;
2196 if (device->handler)
2199 if (!device->flags.initialized) {
2200 device->flags.power_manageable =
2201 device->power.states[ACPI_STATE_D0].flags.valid;
2202 if (acpi_bus_init_power(device))
2203 device->flags.power_manageable = 0;
2205 device->flags.initialized = true;
2206 } else if (device->flags.visited) {
2210 ret = acpi_scan_attach_handler(device);
2214 device->flags.match_driver = true;
2215 if (ret > 0 && !device->flags.enumeration_by_parent) {
2216 acpi_device_set_enumerated(device);
2220 ret = device_attach(&device->dev);
2224 if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2225 acpi_default_enumeration(device);
2227 acpi_device_set_enumerated(device);
2230 acpi_dev_for_each_child(device, acpi_bus_attach, first_pass);
2232 if (!skip && device->handler && device->handler->hotplug.notify_online)
2233 device->handler->hotplug.notify_online(device);
2238 static int acpi_dev_get_first_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
2240 struct acpi_device *adev;
2242 adev = acpi_bus_get_acpi_device(dep->consumer);
2244 *(struct acpi_device **)data = adev;
2247 /* Continue parsing if the device object is not present. */
2251 struct acpi_scan_clear_dep_work {
2252 struct work_struct work;
2253 struct acpi_device *adev;
2256 static void acpi_scan_clear_dep_fn(struct work_struct *work)
2258 struct acpi_scan_clear_dep_work *cdw;
2260 cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
2262 acpi_scan_lock_acquire();
2263 acpi_bus_attach(cdw->adev, (void *)true);
2264 acpi_scan_lock_release();
2266 acpi_dev_put(cdw->adev);
2270 static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
2272 struct acpi_scan_clear_dep_work *cdw;
2274 if (adev->dep_unmet)
2277 cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
2282 INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
2284 * Since the work function may block on the lock until the entire
2285 * initial enumeration of devices is complete, put it into the unbound
2288 queue_work(system_unbound_wq, &cdw->work);
2293 static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
2295 struct acpi_device *adev = acpi_bus_get_acpi_device(dep->consumer);
2299 if (!acpi_scan_clear_dep_queue(adev))
2303 list_del(&dep->node);
2310 * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list
2311 * @handle: The ACPI handle of the supplier device
2312 * @callback: Pointer to the callback function to apply
2313 * @data: Pointer to some data to pass to the callback
2315 * The return value of the callback determines this function's behaviour. If 0
2316 * is returned we continue to iterate over acpi_dep_list. If a positive value
2317 * is returned then the loop is broken but this function returns 0. If a
2318 * negative value is returned by the callback then the loop is broken and that
2319 * value is returned as the final error.
2321 static int acpi_walk_dep_device_list(acpi_handle handle,
2322 int (*callback)(struct acpi_dep_data *, void *),
2325 struct acpi_dep_data *dep, *tmp;
2328 mutex_lock(&acpi_dep_list_lock);
2329 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2330 if (dep->supplier == handle) {
2331 ret = callback(dep, data);
2336 mutex_unlock(&acpi_dep_list_lock);
2338 return ret > 0 ? 0 : ret;
2342 * acpi_dev_clear_dependencies - Inform consumers that the device is now active
2343 * @supplier: Pointer to the supplier &struct acpi_device
2345 * Clear dependencies on the given device.
2347 void acpi_dev_clear_dependencies(struct acpi_device *supplier)
2349 acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
2351 EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
2354 * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration
2355 * @device: Pointer to the &struct acpi_device to check
2357 * Check if the device is present and has no unmet dependencies.
2359 * Return true if the device is ready for enumeratino. Otherwise, return false.
2361 bool acpi_dev_ready_for_enumeration(const struct acpi_device *device)
2363 if (device->flags.honor_deps && device->dep_unmet)
2366 return acpi_device_is_present(device);
2368 EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);
2371 * acpi_dev_get_first_consumer_dev - Return ACPI device dependent on @supplier
2372 * @supplier: Pointer to the dependee device
2374 * Returns the first &struct acpi_device which declares itself dependent on
2375 * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
2377 * The caller is responsible for putting the reference to adev when it is no
2380 struct acpi_device *acpi_dev_get_first_consumer_dev(struct acpi_device *supplier)
2382 struct acpi_device *adev = NULL;
2384 acpi_walk_dep_device_list(supplier->handle,
2385 acpi_dev_get_first_consumer_dev_cb, &adev);
2389 EXPORT_SYMBOL_GPL(acpi_dev_get_first_consumer_dev);
2392 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2393 * @handle: Root of the namespace scope to scan.
2395 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2398 * If no devices were found, -ENODEV is returned, but it does not mean that
2399 * there has been a real error. There just have been no suitable ACPI objects
2400 * in the table trunk from which the kernel could create a device and add an
2401 * appropriate driver.
2403 * Must be called under acpi_scan_lock.
2405 int acpi_bus_scan(acpi_handle handle)
2407 struct acpi_device *device = NULL;
2409 acpi_bus_scan_second_pass = false;
2411 /* Pass 1: Avoid enumerating devices with missing dependencies. */
2413 if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2414 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2415 acpi_bus_check_add_1, NULL, NULL,
2421 acpi_bus_attach(device, (void *)true);
2423 if (!acpi_bus_scan_second_pass)
2426 /* Pass 2: Enumerate all of the remaining devices. */
2430 if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device)))
2431 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2432 acpi_bus_check_add_2, NULL, NULL,
2435 acpi_bus_attach(device, NULL);
2439 EXPORT_SYMBOL(acpi_bus_scan);
2441 static int acpi_bus_trim_one(struct acpi_device *adev, void *not_used)
2443 struct acpi_scan_handler *handler = adev->handler;
2445 acpi_dev_for_each_child_reverse(adev, acpi_bus_trim_one, NULL);
2447 adev->flags.match_driver = false;
2449 if (handler->detach)
2450 handler->detach(adev);
2452 adev->handler = NULL;
2454 device_release_driver(&adev->dev);
2457 * Most likely, the device is going away, so put it into D3cold before
2460 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2461 adev->flags.initialized = false;
2462 acpi_device_clear_enumerated(adev);
2468 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2469 * @adev: Root of the ACPI namespace scope to walk.
2471 * Must be called under acpi_scan_lock.
2473 void acpi_bus_trim(struct acpi_device *adev)
2475 acpi_bus_trim_one(adev, NULL);
2477 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2479 int acpi_bus_register_early_device(int type)
2481 struct acpi_device *device = NULL;
2484 result = acpi_add_single_object(&device, NULL, type, false);
2488 device->flags.match_driver = true;
2489 return device_attach(&device->dev);
2491 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2493 static void acpi_bus_scan_fixed(void)
2495 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2496 struct acpi_device *adev = NULL;
2498 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON,
2501 adev->flags.match_driver = true;
2502 if (device_attach(&adev->dev) >= 0)
2503 device_init_wakeup(&adev->dev, true);
2505 dev_dbg(&adev->dev, "No driver\n");
2509 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2510 struct acpi_device *adev = NULL;
2512 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON,
2515 adev->flags.match_driver = true;
2516 if (device_attach(&adev->dev) < 0)
2517 dev_dbg(&adev->dev, "No driver\n");
2522 static void __init acpi_get_spcr_uart_addr(void)
2525 struct acpi_table_spcr *spcr_ptr;
2527 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2528 (struct acpi_table_header **)&spcr_ptr);
2529 if (ACPI_FAILURE(status)) {
2530 pr_warn("STAO table present, but SPCR is missing\n");
2534 spcr_uart_addr = spcr_ptr->serial_port.address;
2535 acpi_put_table((struct acpi_table_header *)spcr_ptr);
2538 static bool acpi_scan_initialized;
2540 void __init acpi_scan_init(void)
2543 struct acpi_table_stao *stao_ptr;
2545 acpi_pci_root_init();
2546 acpi_pci_link_init();
2547 acpi_processor_init();
2548 acpi_platform_init();
2551 acpi_cmos_rtc_init();
2552 acpi_container_init();
2553 acpi_memory_hotplug_init();
2554 acpi_watchdog_init();
2556 acpi_int340x_thermal_init();
2560 acpi_scan_add_handler(&generic_device_handler);
2563 * If there is STAO table, check whether it needs to ignore the UART
2564 * device in SPCR table.
2566 status = acpi_get_table(ACPI_SIG_STAO, 0,
2567 (struct acpi_table_header **)&stao_ptr);
2568 if (ACPI_SUCCESS(status)) {
2569 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2570 pr_info("STAO Name List not yet supported.\n");
2572 if (stao_ptr->ignore_uart)
2573 acpi_get_spcr_uart_addr();
2575 acpi_put_table((struct acpi_table_header *)stao_ptr);
2578 acpi_gpe_apply_masked_gpes();
2579 acpi_update_all_gpes();
2582 * Although we call __add_memory() that is documented to require the
2583 * device_hotplug_lock, it is not necessary here because this is an
2584 * early code when userspace or any other code path cannot trigger
2585 * hotplug/hotunplug operations.
2587 mutex_lock(&acpi_scan_lock);
2589 * Enumerate devices in the ACPI namespace.
2591 if (acpi_bus_scan(ACPI_ROOT_OBJECT))
2594 acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);
2598 /* Fixed feature devices do not exist on HW-reduced platform */
2599 if (!acpi_gbl_reduced_hardware)
2600 acpi_bus_scan_fixed();
2602 acpi_turn_off_unused_power_resources();
2604 acpi_scan_initialized = true;
2607 mutex_unlock(&acpi_scan_lock);
2610 static struct acpi_probe_entry *ape;
2611 static int acpi_probe_count;
2612 static DEFINE_MUTEX(acpi_probe_mutex);
2614 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2615 const unsigned long end)
2617 if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2618 if (!ape->probe_subtbl(header, end))
2624 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2631 mutex_lock(&acpi_probe_mutex);
2632 for (ape = ap_head; nr; ape++, nr--) {
2633 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2634 acpi_probe_count = 0;
2635 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2636 count += acpi_probe_count;
2639 res = acpi_table_parse(ape->id, ape->probe_table);
2644 mutex_unlock(&acpi_probe_mutex);
2649 static void acpi_table_events_fn(struct work_struct *work)
2651 acpi_scan_lock_acquire();
2652 acpi_bus_scan(ACPI_ROOT_OBJECT);
2653 acpi_scan_lock_release();
2658 void acpi_scan_table_notify(void)
2660 struct work_struct *work;
2662 if (!acpi_scan_initialized)
2665 work = kmalloc(sizeof(*work), GFP_KERNEL);
2669 INIT_WORK(work, acpi_table_events_fn);
2670 schedule_work(work);
2673 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2675 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2677 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2679 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2681 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2683 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);