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>
23 #include <linux/dma-direct.h>
28 #define ACPI_BUS_CLASS "system_bus"
29 #define ACPI_BUS_HID "LNXSYBUS"
30 #define ACPI_BUS_DEVICE_NAME "System Bus"
32 #define INVALID_ACPI_HANDLE ((acpi_handle)ZERO_PAGE(0))
34 static const char *dummy_hid = "device";
36 static LIST_HEAD(acpi_dep_list);
37 static DEFINE_MUTEX(acpi_dep_list_lock);
38 LIST_HEAD(acpi_bus_id_list);
39 static DEFINE_MUTEX(acpi_scan_lock);
40 static LIST_HEAD(acpi_scan_handlers_list);
41 DEFINE_MUTEX(acpi_device_lock);
42 LIST_HEAD(acpi_wakeup_device_list);
43 static DEFINE_MUTEX(acpi_hp_context_lock);
46 * The UART device described by the SPCR table is the only object which needs
47 * special-casing. Everything else is covered by ACPI namespace paths in STAO
50 static u64 spcr_uart_addr;
52 void acpi_scan_lock_acquire(void)
54 mutex_lock(&acpi_scan_lock);
56 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
58 void acpi_scan_lock_release(void)
60 mutex_unlock(&acpi_scan_lock);
62 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
64 void acpi_lock_hp_context(void)
66 mutex_lock(&acpi_hp_context_lock);
69 void acpi_unlock_hp_context(void)
71 mutex_unlock(&acpi_hp_context_lock);
74 void acpi_initialize_hp_context(struct acpi_device *adev,
75 struct acpi_hotplug_context *hp,
76 int (*notify)(struct acpi_device *, u32),
77 void (*uevent)(struct acpi_device *, u32))
79 acpi_lock_hp_context();
82 acpi_set_hp_context(adev, hp);
83 acpi_unlock_hp_context();
85 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
87 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
92 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
96 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
97 const char *hotplug_profile_name)
101 error = acpi_scan_add_handler(handler);
105 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
109 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
111 struct acpi_device_physical_node *pn;
113 char *envp[] = { "EVENT=offline", NULL };
116 * acpi_container_offline() calls this for all of the container's
117 * children under the container's physical_node_lock lock.
119 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
121 list_for_each_entry(pn, &adev->physical_node_list, node)
122 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
124 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
130 mutex_unlock(&adev->physical_node_lock);
134 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
137 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
138 struct acpi_device_physical_node *pn;
139 bool second_pass = (bool)data;
140 acpi_status status = AE_OK;
145 if (device->handler && !device->handler->hotplug.enabled) {
146 *ret_p = &device->dev;
150 mutex_lock(&device->physical_node_lock);
152 list_for_each_entry(pn, &device->physical_node_list, node) {
156 /* Skip devices offlined by the first pass. */
160 pn->put_online = false;
162 ret = device_offline(pn->dev);
164 pn->put_online = !ret;
174 mutex_unlock(&device->physical_node_lock);
179 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
182 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
183 struct acpi_device_physical_node *pn;
188 mutex_lock(&device->physical_node_lock);
190 list_for_each_entry(pn, &device->physical_node_list, node)
191 if (pn->put_online) {
192 device_online(pn->dev);
193 pn->put_online = false;
196 mutex_unlock(&device->physical_node_lock);
201 static int acpi_scan_try_to_offline(struct acpi_device *device)
203 acpi_handle handle = device->handle;
204 struct device *errdev = NULL;
208 * Carry out two passes here and ignore errors in the first pass,
209 * because if the devices in question are memory blocks and
210 * CONFIG_MEMCG is set, one of the blocks may hold data structures
211 * that the other blocks depend on, but it is not known in advance which
214 * If the first pass is successful, the second one isn't needed, though.
216 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
217 NULL, acpi_bus_offline, (void *)false,
219 if (status == AE_SUPPORT) {
220 dev_warn(errdev, "Offline disabled.\n");
221 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
222 acpi_bus_online, NULL, NULL, NULL);
225 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
228 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
229 NULL, acpi_bus_offline, (void *)true,
232 acpi_bus_offline(handle, 0, (void *)true,
236 dev_warn(errdev, "Offline failed.\n");
237 acpi_bus_online(handle, 0, NULL, NULL);
238 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
239 ACPI_UINT32_MAX, acpi_bus_online,
247 static int acpi_scan_hot_remove(struct acpi_device *device)
249 acpi_handle handle = device->handle;
250 unsigned long long sta;
253 if (device->handler && device->handler->hotplug.demand_offline) {
254 if (!acpi_scan_is_offline(device, true))
257 int error = acpi_scan_try_to_offline(device);
262 acpi_handle_debug(handle, "Ejecting\n");
264 acpi_bus_trim(device);
266 acpi_evaluate_lck(handle, 0);
270 status = acpi_evaluate_ej0(handle);
271 if (status == AE_NOT_FOUND)
273 else if (ACPI_FAILURE(status))
277 * Verify if eject was indeed successful. If not, log an error
278 * message. No need to call _OST since _EJ0 call was made OK.
280 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
281 if (ACPI_FAILURE(status)) {
282 acpi_handle_warn(handle,
283 "Status check after eject failed (0x%x)\n", status);
284 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
285 acpi_handle_warn(handle,
286 "Eject incomplete - status 0x%llx\n", sta);
292 static int acpi_scan_device_not_present(struct acpi_device *adev)
294 if (!acpi_device_enumerated(adev)) {
295 dev_warn(&adev->dev, "Still not present\n");
302 static int acpi_scan_device_check(struct acpi_device *adev)
306 acpi_bus_get_status(adev);
307 if (adev->status.present || adev->status.functional) {
309 * This function is only called for device objects for which
310 * matching scan handlers exist. The only situation in which
311 * the scan handler is not attached to this device object yet
312 * is when the device has just appeared (either it wasn't
313 * present at all before or it was removed and then added
317 dev_warn(&adev->dev, "Already enumerated\n");
320 error = acpi_bus_scan(adev->handle);
322 dev_warn(&adev->dev, "Namespace scan failure\n");
325 if (!adev->handler) {
326 dev_warn(&adev->dev, "Enumeration failure\n");
330 error = acpi_scan_device_not_present(adev);
335 static int acpi_scan_bus_check(struct acpi_device *adev, void *not_used)
337 struct acpi_scan_handler *handler = adev->handler;
340 acpi_bus_get_status(adev);
341 if (!(adev->status.present || adev->status.functional)) {
342 acpi_scan_device_not_present(adev);
345 if (handler && handler->hotplug.scan_dependent)
346 return handler->hotplug.scan_dependent(adev);
348 error = acpi_bus_scan(adev->handle);
350 dev_warn(&adev->dev, "Namespace scan failure\n");
353 return acpi_dev_for_each_child(adev, acpi_scan_bus_check, NULL);
356 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
359 case ACPI_NOTIFY_BUS_CHECK:
360 return acpi_scan_bus_check(adev, NULL);
361 case ACPI_NOTIFY_DEVICE_CHECK:
362 return acpi_scan_device_check(adev);
363 case ACPI_NOTIFY_EJECT_REQUEST:
364 case ACPI_OST_EC_OSPM_EJECT:
365 if (adev->handler && !adev->handler->hotplug.enabled) {
366 dev_info(&adev->dev, "Eject disabled\n");
369 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
370 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
371 return acpi_scan_hot_remove(adev);
376 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
378 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
381 lock_device_hotplug();
382 mutex_lock(&acpi_scan_lock);
385 * The device object's ACPI handle cannot become invalid as long as we
386 * are holding acpi_scan_lock, but it might have become invalid before
387 * that lock was acquired.
389 if (adev->handle == INVALID_ACPI_HANDLE)
392 if (adev->flags.is_dock_station) {
393 error = dock_notify(adev, src);
394 } else if (adev->flags.hotplug_notify) {
395 error = acpi_generic_hotplug_event(adev, src);
397 int (*notify)(struct acpi_device *, u32);
399 acpi_lock_hp_context();
400 notify = adev->hp ? adev->hp->notify : NULL;
401 acpi_unlock_hp_context();
403 * There may be additional notify handlers for device objects
404 * without the .event() callback, so ignore them here.
407 error = notify(adev, src);
413 ost_code = ACPI_OST_SC_SUCCESS;
416 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
419 ost_code = ACPI_OST_SC_DEVICE_BUSY;
422 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
427 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
430 acpi_put_acpi_dev(adev);
431 mutex_unlock(&acpi_scan_lock);
432 unlock_device_hotplug();
435 static void acpi_free_power_resources_lists(struct acpi_device *device)
439 if (device->wakeup.flags.valid)
440 acpi_power_resources_list_free(&device->wakeup.resources);
442 if (!device->power.flags.power_resources)
445 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
446 struct acpi_device_power_state *ps = &device->power.states[i];
447 acpi_power_resources_list_free(&ps->resources);
451 static void acpi_device_release(struct device *dev)
453 struct acpi_device *acpi_dev = to_acpi_device(dev);
455 acpi_free_properties(acpi_dev);
456 acpi_free_pnp_ids(&acpi_dev->pnp);
457 acpi_free_power_resources_lists(acpi_dev);
461 static void acpi_device_del(struct acpi_device *device)
463 struct acpi_device_bus_id *acpi_device_bus_id;
465 mutex_lock(&acpi_device_lock);
467 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
468 if (!strcmp(acpi_device_bus_id->bus_id,
469 acpi_device_hid(device))) {
470 ida_free(&acpi_device_bus_id->instance_ida,
471 device->pnp.instance_no);
472 if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
473 list_del(&acpi_device_bus_id->node);
474 kfree_const(acpi_device_bus_id->bus_id);
475 kfree(acpi_device_bus_id);
480 list_del(&device->wakeup_list);
482 mutex_unlock(&acpi_device_lock);
484 acpi_power_add_remove_device(device, false);
485 acpi_device_remove_files(device);
487 device->remove(device);
489 device_del(&device->dev);
492 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
494 static LIST_HEAD(acpi_device_del_list);
495 static DEFINE_MUTEX(acpi_device_del_lock);
497 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
500 struct acpi_device *adev;
502 mutex_lock(&acpi_device_del_lock);
504 if (list_empty(&acpi_device_del_list)) {
505 mutex_unlock(&acpi_device_del_lock);
508 adev = list_first_entry(&acpi_device_del_list,
509 struct acpi_device, del_list);
510 list_del(&adev->del_list);
512 mutex_unlock(&acpi_device_del_lock);
514 blocking_notifier_call_chain(&acpi_reconfig_chain,
515 ACPI_RECONFIG_DEVICE_REMOVE, adev);
517 acpi_device_del(adev);
519 * Drop references to all power resources that might have been
520 * used by the device.
522 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
528 * acpi_scan_drop_device - Drop an ACPI device object.
529 * @handle: Handle of an ACPI namespace node, not used.
530 * @context: Address of the ACPI device object to drop.
532 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
533 * namespace node the device object pointed to by @context is attached to.
535 * The unregistration is carried out asynchronously to avoid running
536 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
537 * ensure the correct ordering (the device objects must be unregistered in the
538 * same order in which the corresponding namespace nodes are deleted).
540 static void acpi_scan_drop_device(acpi_handle handle, void *context)
542 static DECLARE_WORK(work, acpi_device_del_work_fn);
543 struct acpi_device *adev = context;
545 mutex_lock(&acpi_device_del_lock);
548 * Use the ACPI hotplug workqueue which is ordered, so this work item
549 * won't run after any hotplug work items submitted subsequently. That
550 * prevents attempts to register device objects identical to those being
551 * deleted from happening concurrently (such attempts result from
552 * hotplug events handled via the ACPI hotplug workqueue). It also will
553 * run after all of the work items submitted previously, which helps
554 * those work items to ensure that they are not accessing stale device
557 if (list_empty(&acpi_device_del_list))
558 acpi_queue_hotplug_work(&work);
560 list_add_tail(&adev->del_list, &acpi_device_del_list);
561 /* Make acpi_ns_validate_handle() return NULL for this handle. */
562 adev->handle = INVALID_ACPI_HANDLE;
564 mutex_unlock(&acpi_device_del_lock);
567 static struct acpi_device *handle_to_device(acpi_handle handle,
568 void (*callback)(void *))
570 struct acpi_device *adev = NULL;
573 status = acpi_get_data_full(handle, acpi_scan_drop_device,
574 (void **)&adev, callback);
575 if (ACPI_FAILURE(status) || !adev) {
576 acpi_handle_debug(handle, "No context!\n");
583 * acpi_fetch_acpi_dev - Retrieve ACPI device object.
584 * @handle: ACPI handle associated with the requested ACPI device object.
586 * Return a pointer to the ACPI device object associated with @handle, if
587 * present, or NULL otherwise.
589 struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)
591 return handle_to_device(handle, NULL);
593 EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);
595 static void get_acpi_device(void *dev)
601 * acpi_get_acpi_dev - Retrieve ACPI device object and reference count it.
602 * @handle: ACPI handle associated with the requested ACPI device object.
604 * Return a pointer to the ACPI device object associated with @handle and bump
605 * up that object's reference counter (under the ACPI Namespace lock), if
606 * present, or return NULL otherwise.
608 * The ACPI device object reference acquired by this function needs to be
609 * dropped via acpi_dev_put().
611 struct acpi_device *acpi_get_acpi_dev(acpi_handle handle)
613 return handle_to_device(handle, get_acpi_device);
615 EXPORT_SYMBOL_GPL(acpi_get_acpi_dev);
617 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
619 struct acpi_device_bus_id *acpi_device_bus_id;
621 /* Find suitable bus_id and instance number in acpi_bus_id_list. */
622 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
623 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
624 return acpi_device_bus_id;
629 static int acpi_device_set_name(struct acpi_device *device,
630 struct acpi_device_bus_id *acpi_device_bus_id)
632 struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
635 result = ida_alloc(instance_ida, GFP_KERNEL);
639 device->pnp.instance_no = result;
640 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
644 int acpi_tie_acpi_dev(struct acpi_device *adev)
646 acpi_handle handle = adev->handle;
652 status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
653 if (ACPI_FAILURE(status)) {
654 acpi_handle_err(handle, "Unable to attach device data\n");
661 static void acpi_store_pld_crc(struct acpi_device *adev)
663 struct acpi_pld_info *pld;
666 status = acpi_get_physical_device_location(adev->handle, &pld);
667 if (ACPI_FAILURE(status))
670 adev->pld_crc = crc32(~0, pld, sizeof(*pld));
674 int acpi_device_add(struct acpi_device *device)
676 struct acpi_device_bus_id *acpi_device_bus_id;
682 * Link this device to its parent and siblings.
684 INIT_LIST_HEAD(&device->wakeup_list);
685 INIT_LIST_HEAD(&device->physical_node_list);
686 INIT_LIST_HEAD(&device->del_list);
687 mutex_init(&device->physical_node_lock);
689 mutex_lock(&acpi_device_lock);
691 acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
692 if (acpi_device_bus_id) {
693 result = acpi_device_set_name(device, acpi_device_bus_id);
697 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
699 if (!acpi_device_bus_id) {
703 acpi_device_bus_id->bus_id =
704 kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
705 if (!acpi_device_bus_id->bus_id) {
706 kfree(acpi_device_bus_id);
711 ida_init(&acpi_device_bus_id->instance_ida);
713 result = acpi_device_set_name(device, acpi_device_bus_id);
715 kfree_const(acpi_device_bus_id->bus_id);
716 kfree(acpi_device_bus_id);
720 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
723 if (device->wakeup.flags.valid)
724 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
726 acpi_store_pld_crc(device);
728 mutex_unlock(&acpi_device_lock);
730 result = device_add(&device->dev);
732 dev_err(&device->dev, "Error registering device\n");
736 result = acpi_device_setup_files(device);
738 pr_err("Error creating sysfs interface for device %s\n",
739 dev_name(&device->dev));
744 mutex_lock(&acpi_device_lock);
746 list_del(&device->wakeup_list);
749 mutex_unlock(&acpi_device_lock);
751 acpi_detach_data(device->handle, acpi_scan_drop_device);
756 /* --------------------------------------------------------------------------
758 -------------------------------------------------------------------------- */
759 static bool acpi_info_matches_ids(struct acpi_device_info *info,
760 const char * const ids[])
762 struct acpi_pnp_device_id_list *cid_list = NULL;
765 if (!(info->valid & ACPI_VALID_HID))
768 index = match_string(ids, -1, info->hardware_id.string);
772 if (info->valid & ACPI_VALID_CID)
773 cid_list = &info->compatible_id_list;
778 for (i = 0; i < cid_list->count; i++) {
779 index = match_string(ids, -1, cid_list->ids[i].string);
787 /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
788 static const char * const acpi_ignore_dep_ids[] = {
789 "PNP0D80", /* Windows-compatible System Power Management Controller */
790 "INT33BD", /* Intel Baytrail Mailbox Device */
791 "LATT2021", /* Lattice FW Update Client Driver */
795 /* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */
796 static const char * const acpi_honor_dep_ids[] = {
797 "INT3472", /* Camera sensor PMIC / clk and regulator info */
798 "INTC1059", /* IVSC (TGL) driver must be loaded to allow i2c access to camera sensors */
799 "INTC1095", /* IVSC (ADL) driver must be loaded to allow i2c access to camera sensors */
800 "INTC100A", /* IVSC (RPL) driver must be loaded to allow i2c access to camera sensors */
804 static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle)
806 struct acpi_device *adev;
809 * Fixed hardware devices do not appear in the namespace and do not
810 * have handles, but we fabricate acpi_devices for them, so we have
811 * to deal with them specially.
819 status = acpi_get_parent(handle, &handle);
820 if (ACPI_FAILURE(status)) {
821 if (status != AE_NULL_ENTRY)
826 adev = 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 /* Do not use a button for S5 wakeup */
936 #define ACPI_AVOID_WAKE_FROM_S5 BIT(0)
938 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
940 static const struct acpi_device_id button_device_ids[] = {
941 {"PNP0C0C", 0}, /* Power button */
942 {"PNP0C0D", ACPI_AVOID_WAKE_FROM_S5}, /* Lid */
943 {"PNP0C0E", ACPI_AVOID_WAKE_FROM_S5}, /* Sleep button */
946 struct acpi_device_wakeup *wakeup = &device->wakeup;
947 const struct acpi_device_id *match;
950 wakeup->flags.notifier_present = 0;
952 /* Power button, Lid switch always enable wakeup */
953 match = acpi_match_acpi_device(button_device_ids, device);
955 if ((match->driver_data & ACPI_AVOID_WAKE_FROM_S5) &&
956 wakeup->sleep_state == ACPI_STATE_S5)
957 wakeup->sleep_state = ACPI_STATE_S4;
958 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
959 device_set_wakeup_capable(&device->dev, true);
963 status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
965 return ACPI_SUCCESS(status);
968 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
972 /* Presence of _PRW indicates wake capable */
973 if (!acpi_has_method(device->handle, "_PRW"))
976 err = acpi_bus_extract_wakeup_device_power_package(device);
978 dev_err(&device->dev, "Unable to extract wakeup power resources");
982 device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
983 device->wakeup.prepare_count = 0;
985 * Call _PSW/_DSW object to disable its ability to wake the sleeping
986 * system for the ACPI device with the _PRW object.
987 * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
988 * So it is necessary to call _DSW object first. Only when it is not
989 * present will the _PSW object used.
991 err = acpi_device_sleep_wake(device, 0, 0, 0);
993 pr_debug("error in _DSW or _PSW evaluation\n");
996 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
998 struct acpi_device_power_state *ps = &device->power.states[state];
999 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1000 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1003 INIT_LIST_HEAD(&ps->resources);
1005 /* Evaluate "_PRx" to get referenced power resources */
1006 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1007 if (ACPI_SUCCESS(status)) {
1008 union acpi_object *package = buffer.pointer;
1010 if (buffer.length && package
1011 && package->type == ACPI_TYPE_PACKAGE
1012 && package->package.count)
1013 acpi_extract_power_resources(package, 0, &ps->resources);
1015 ACPI_FREE(buffer.pointer);
1018 /* Evaluate "_PSx" to see if we can do explicit sets */
1020 if (acpi_has_method(device->handle, pathname))
1021 ps->flags.explicit_set = 1;
1023 /* State is valid if there are means to put the device into it. */
1024 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
1025 ps->flags.valid = 1;
1027 ps->power = -1; /* Unknown - driver assigned */
1028 ps->latency = -1; /* Unknown - driver assigned */
1031 static void acpi_bus_get_power_flags(struct acpi_device *device)
1033 unsigned long long dsc = ACPI_STATE_D0;
1036 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1037 if (!acpi_has_method(device->handle, "_PS0") &&
1038 !acpi_has_method(device->handle, "_PR0"))
1041 device->flags.power_manageable = 1;
1044 * Power Management Flags
1046 if (acpi_has_method(device->handle, "_PSC"))
1047 device->power.flags.explicit_get = 1;
1049 if (acpi_has_method(device->handle, "_IRC"))
1050 device->power.flags.inrush_current = 1;
1052 if (acpi_has_method(device->handle, "_DSW"))
1053 device->power.flags.dsw_present = 1;
1055 acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc);
1056 device->power.state_for_enumeration = dsc;
1059 * Enumerate supported power management states
1061 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1062 acpi_bus_init_power_state(device, i);
1064 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1066 /* Set the defaults for D0 and D3hot (always supported). */
1067 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1068 device->power.states[ACPI_STATE_D0].power = 100;
1069 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1072 * Use power resources only if the D0 list of them is populated, because
1073 * some platforms may provide _PR3 only to indicate D3cold support and
1074 * in those cases the power resources list returned by it may be bogus.
1076 if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1077 device->power.flags.power_resources = 1;
1079 * D3cold is supported if the D3hot list of power resources is
1082 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1083 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1086 if (acpi_bus_init_power(device))
1087 device->flags.power_manageable = 0;
1090 static void acpi_bus_get_flags(struct acpi_device *device)
1092 /* Presence of _STA indicates 'dynamic_status' */
1093 if (acpi_has_method(device->handle, "_STA"))
1094 device->flags.dynamic_status = 1;
1096 /* Presence of _RMV indicates 'removable' */
1097 if (acpi_has_method(device->handle, "_RMV"))
1098 device->flags.removable = 1;
1100 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1101 if (acpi_has_method(device->handle, "_EJD") ||
1102 acpi_has_method(device->handle, "_EJ0"))
1103 device->flags.ejectable = 1;
1106 static void acpi_device_get_busid(struct acpi_device *device)
1108 char bus_id[5] = { '?', 0 };
1109 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1115 * The device's Bus ID is simply the object name.
1116 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1118 if (!acpi_dev_parent(device)) {
1119 strcpy(device->pnp.bus_id, "ACPI");
1123 switch (device->device_type) {
1124 case ACPI_BUS_TYPE_POWER_BUTTON:
1125 strcpy(device->pnp.bus_id, "PWRF");
1127 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1128 strcpy(device->pnp.bus_id, "SLPF");
1130 case ACPI_BUS_TYPE_ECDT_EC:
1131 strcpy(device->pnp.bus_id, "ECDT");
1134 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1135 /* Clean up trailing underscores (if any) */
1136 for (i = 3; i > 1; i--) {
1137 if (bus_id[i] == '_')
1142 strcpy(device->pnp.bus_id, bus_id);
1148 * acpi_ata_match - see if an acpi object is an ATA device
1150 * If an acpi object has one of the ACPI ATA methods defined,
1151 * then we can safely call it an ATA device.
1153 bool acpi_ata_match(acpi_handle handle)
1155 return acpi_has_method(handle, "_GTF") ||
1156 acpi_has_method(handle, "_GTM") ||
1157 acpi_has_method(handle, "_STM") ||
1158 acpi_has_method(handle, "_SDD");
1162 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1164 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1165 * then we can safely call it an ejectable drive bay
1167 bool acpi_bay_match(acpi_handle handle)
1169 acpi_handle phandle;
1171 if (!acpi_has_method(handle, "_EJ0"))
1173 if (acpi_ata_match(handle))
1175 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1178 return acpi_ata_match(phandle);
1181 bool acpi_device_is_battery(struct acpi_device *adev)
1183 struct acpi_hardware_id *hwid;
1185 list_for_each_entry(hwid, &adev->pnp.ids, list)
1186 if (!strcmp("PNP0C0A", hwid->id))
1192 static bool is_ejectable_bay(struct acpi_device *adev)
1194 acpi_handle handle = adev->handle;
1196 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1199 return acpi_bay_match(handle);
1203 * acpi_dock_match - see if an acpi object has a _DCK method
1205 bool acpi_dock_match(acpi_handle handle)
1207 return acpi_has_method(handle, "_DCK");
1211 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1212 void **return_value)
1214 long *cap = context;
1216 if (acpi_has_method(handle, "_BCM") &&
1217 acpi_has_method(handle, "_BCL")) {
1218 acpi_handle_debug(handle, "Found generic backlight support\n");
1219 *cap |= ACPI_VIDEO_BACKLIGHT;
1220 /* We have backlight support, no need to scan further */
1221 return AE_CTRL_TERMINATE;
1226 /* Returns true if the ACPI object is a video device which can be
1227 * handled by video.ko.
1228 * The device will get a Linux specific CID added in scan.c to
1229 * identify the device as an ACPI graphics device
1230 * Be aware that the graphics device may not be physically present
1231 * Use acpi_video_get_capabilities() to detect general ACPI video
1232 * capabilities of present cards
1234 long acpi_is_video_device(acpi_handle handle)
1236 long video_caps = 0;
1238 /* Is this device able to support video switching ? */
1239 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1240 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1242 /* Is this device able to retrieve a video ROM ? */
1243 if (acpi_has_method(handle, "_ROM"))
1244 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1246 /* Is this device able to configure which video head to be POSTed ? */
1247 if (acpi_has_method(handle, "_VPO") &&
1248 acpi_has_method(handle, "_GPD") &&
1249 acpi_has_method(handle, "_SPD"))
1250 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1252 /* Only check for backlight functionality if one of the above hit. */
1254 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1255 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1260 EXPORT_SYMBOL(acpi_is_video_device);
1262 const char *acpi_device_hid(struct acpi_device *device)
1264 struct acpi_hardware_id *hid;
1266 if (list_empty(&device->pnp.ids))
1269 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1272 EXPORT_SYMBOL(acpi_device_hid);
1274 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1276 struct acpi_hardware_id *id;
1278 id = kmalloc(sizeof(*id), GFP_KERNEL);
1282 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1288 list_add_tail(&id->list, &pnp->ids);
1289 pnp->type.hardware_id = 1;
1293 * Old IBM workstations have a DSDT bug wherein the SMBus object
1294 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1295 * prefix. Work around this.
1297 static bool acpi_ibm_smbus_match(acpi_handle handle)
1299 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1300 struct acpi_buffer path = { sizeof(node_name), node_name };
1302 if (!dmi_name_in_vendors("IBM"))
1305 /* Look for SMBS object */
1306 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1307 strcmp("SMBS", path.pointer))
1310 /* Does it have the necessary (but misnamed) methods? */
1311 if (acpi_has_method(handle, "SBI") &&
1312 acpi_has_method(handle, "SBR") &&
1313 acpi_has_method(handle, "SBW"))
1319 static bool acpi_object_is_system_bus(acpi_handle handle)
1323 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1326 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1333 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1336 struct acpi_device_info *info = NULL;
1337 struct acpi_pnp_device_id_list *cid_list;
1340 switch (device_type) {
1341 case ACPI_BUS_TYPE_DEVICE:
1342 if (handle == ACPI_ROOT_OBJECT) {
1343 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1347 acpi_get_object_info(handle, &info);
1349 pr_err("%s: Error reading device info\n", __func__);
1353 if (info->valid & ACPI_VALID_HID) {
1354 acpi_add_id(pnp, info->hardware_id.string);
1355 pnp->type.platform_id = 1;
1357 if (info->valid & ACPI_VALID_CID) {
1358 cid_list = &info->compatible_id_list;
1359 for (i = 0; i < cid_list->count; i++)
1360 acpi_add_id(pnp, cid_list->ids[i].string);
1362 if (info->valid & ACPI_VALID_ADR) {
1363 pnp->bus_address = info->address;
1364 pnp->type.bus_address = 1;
1366 if (info->valid & ACPI_VALID_UID)
1367 pnp->unique_id = kstrdup(info->unique_id.string,
1369 if (info->valid & ACPI_VALID_CLS)
1370 acpi_add_id(pnp, info->class_code.string);
1375 * Some devices don't reliably have _HIDs & _CIDs, so add
1376 * synthetic HIDs to make sure drivers can find them.
1378 if (acpi_is_video_device(handle)) {
1379 acpi_add_id(pnp, ACPI_VIDEO_HID);
1380 pnp->type.backlight = 1;
1383 if (acpi_bay_match(handle))
1384 acpi_add_id(pnp, ACPI_BAY_HID);
1385 else if (acpi_dock_match(handle))
1386 acpi_add_id(pnp, ACPI_DOCK_HID);
1387 else if (acpi_ibm_smbus_match(handle))
1388 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1389 else if (list_empty(&pnp->ids) &&
1390 acpi_object_is_system_bus(handle)) {
1391 /* \_SB, \_TZ, LNXSYBUS */
1392 acpi_add_id(pnp, ACPI_BUS_HID);
1393 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1394 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1398 case ACPI_BUS_TYPE_POWER:
1399 acpi_add_id(pnp, ACPI_POWER_HID);
1401 case ACPI_BUS_TYPE_PROCESSOR:
1402 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1404 case ACPI_BUS_TYPE_THERMAL:
1405 acpi_add_id(pnp, ACPI_THERMAL_HID);
1407 case ACPI_BUS_TYPE_POWER_BUTTON:
1408 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1410 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1411 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1413 case ACPI_BUS_TYPE_ECDT_EC:
1414 acpi_add_id(pnp, ACPI_ECDT_HID);
1419 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1421 struct acpi_hardware_id *id, *tmp;
1423 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1424 kfree_const(id->id);
1427 kfree(pnp->unique_id);
1431 * acpi_dma_supported - Check DMA support for the specified device.
1432 * @adev: The pointer to acpi device
1434 * Return false if DMA is not supported. Otherwise, return true
1436 bool acpi_dma_supported(const struct acpi_device *adev)
1441 if (adev->flags.cca_seen)
1445 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1446 * DMA on "Intel platforms". Presumably that includes all x86 and
1447 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1449 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1456 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1457 * @adev: The pointer to acpi device
1459 * Return enum dev_dma_attr.
1461 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1463 if (!acpi_dma_supported(adev))
1464 return DEV_DMA_NOT_SUPPORTED;
1466 if (adev->flags.coherent_dma)
1467 return DEV_DMA_COHERENT;
1469 return DEV_DMA_NON_COHERENT;
1473 * acpi_dma_get_range() - Get device DMA parameters.
1475 * @dev: device to configure
1476 * @map: pointer to DMA ranges result
1478 * Evaluate DMA regions and return pointer to DMA regions on
1479 * parsing success; it does not update the passed in values on failure.
1481 * Return 0 on success, < 0 on failure.
1483 int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map)
1485 struct acpi_device *adev;
1487 struct resource_entry *rentry;
1489 struct device *dma_dev = dev;
1490 struct bus_dma_region *r;
1493 * Walk the device tree chasing an ACPI companion with a _DMA
1494 * object while we go. Stop if we find a device with an ACPI
1495 * companion containing a _DMA method.
1498 adev = ACPI_COMPANION(dma_dev);
1499 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1502 dma_dev = dma_dev->parent;
1508 if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1509 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1513 ret = acpi_dev_get_dma_resources(adev, &list);
1515 r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL);
1523 list_for_each_entry(rentry, &list, node) {
1524 if (rentry->res->start >= rentry->res->end) {
1528 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1532 r->cpu_start = rentry->res->start;
1533 r->dma_start = rentry->res->start - rentry->offset;
1534 r->size = resource_size(rentry->res);
1535 r->offset = rentry->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;
1571 /* Serialise to make dev->iommu stable under our potential fwspec */
1572 mutex_lock(&iommu_probe_device_lock);
1574 * If we already translated the fwspec there is nothing left to do,
1575 * return the iommu_ops.
1577 ops = acpi_iommu_fwspec_ops(dev);
1579 mutex_unlock(&iommu_probe_device_lock);
1583 err = iort_iommu_configure_id(dev, id_in);
1584 if (err && err != -EPROBE_DEFER)
1585 err = viot_iommu_configure(dev);
1586 mutex_unlock(&iommu_probe_device_lock);
1589 * If we have reason to believe the IOMMU driver missed the initial
1590 * iommu_probe_device() call for dev, replay it to get things in order.
1592 if (!err && dev->bus)
1593 err = iommu_probe_device(dev);
1595 /* Ignore all other errors apart from EPROBE_DEFER */
1596 if (err == -EPROBE_DEFER) {
1597 return ERR_PTR(err);
1599 dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
1602 return acpi_iommu_fwspec_ops(dev);
1605 #else /* !CONFIG_IOMMU_API */
1607 int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1608 struct fwnode_handle *fwnode,
1609 const struct iommu_ops *ops)
1614 static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
1620 #endif /* !CONFIG_IOMMU_API */
1623 * acpi_dma_configure_id - Set-up DMA configuration for the device.
1624 * @dev: The pointer to the device
1625 * @attr: device dma attributes
1626 * @input_id: input device id const value pointer
1628 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1629 const u32 *input_id)
1631 const struct iommu_ops *iommu;
1633 if (attr == DEV_DMA_NOT_SUPPORTED) {
1634 set_dma_ops(dev, &dma_dummy_ops);
1638 acpi_arch_dma_setup(dev);
1640 iommu = acpi_iommu_configure_id(dev, input_id);
1641 if (PTR_ERR(iommu) == -EPROBE_DEFER)
1642 return -EPROBE_DEFER;
1644 arch_setup_dma_ops(dev, 0, U64_MAX,
1645 iommu, attr == DEV_DMA_COHERENT);
1649 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1651 static void acpi_init_coherency(struct acpi_device *adev)
1653 unsigned long long cca = 0;
1655 struct acpi_device *parent = acpi_dev_parent(adev);
1657 if (parent && parent->flags.cca_seen) {
1659 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1662 adev->flags.cca_seen = 1;
1663 cca = parent->flags.coherent_dma;
1665 status = acpi_evaluate_integer(adev->handle, "_CCA",
1667 if (ACPI_SUCCESS(status))
1668 adev->flags.cca_seen = 1;
1669 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1671 * If architecture does not specify that _CCA is
1672 * required for DMA-able devices (e.g. x86),
1673 * we default to _CCA=1.
1677 acpi_handle_debug(adev->handle,
1678 "ACPI device is missing _CCA.\n");
1681 adev->flags.coherent_dma = cca;
1684 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1686 bool *is_serial_bus_slave_p = data;
1688 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1691 *is_serial_bus_slave_p = true;
1693 /* no need to do more checking */
1697 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1699 struct acpi_device *parent = acpi_dev_parent(device);
1700 static const struct acpi_device_id indirect_io_hosts[] = {
1705 return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1708 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1710 struct list_head resource_list;
1711 bool is_serial_bus_slave = false;
1712 static const struct acpi_device_id ignore_serial_bus_ids[] = {
1714 * These devices have multiple SerialBus resources and a client
1715 * device must be instantiated for each of them, each with
1716 * its own device id.
1717 * Normally we only instantiate one client device for the first
1718 * resource, using the ACPI HID as id. These special cases are handled
1719 * by the drivers/platform/x86/serial-multi-instantiate.c driver, which
1720 * knows which client device id to use for each resource.
1728 /* Non-conforming _HID for Cirrus Logic already released */
1732 * Some ACPI devs contain SerialBus resources even though they are not
1733 * attached to a serial bus at all.
1737 * HIDs of device with an UartSerialBusV2 resource for which userspace
1738 * expects a regular tty cdev to be created (instead of the in kernel
1739 * serdev) and which have a kernel driver which expects a platform_dev
1740 * such as the rfkill-gpio driver.
1747 if (acpi_is_indirect_io_slave(device))
1750 /* Macs use device properties in lieu of _CRS resources */
1751 if (x86_apple_machine &&
1752 (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1753 fwnode_property_present(&device->fwnode, "i2cAddress") ||
1754 fwnode_property_present(&device->fwnode, "baud")))
1757 if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
1760 INIT_LIST_HEAD(&resource_list);
1761 acpi_dev_get_resources(device, &resource_list,
1762 acpi_check_serial_bus_slave,
1763 &is_serial_bus_slave);
1764 acpi_dev_free_resource_list(&resource_list);
1766 return is_serial_bus_slave;
1769 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1770 int type, void (*release)(struct device *))
1772 struct acpi_device *parent = acpi_find_parent_acpi_dev(handle);
1774 INIT_LIST_HEAD(&device->pnp.ids);
1775 device->device_type = type;
1776 device->handle = handle;
1777 device->dev.parent = parent ? &parent->dev : NULL;
1778 device->dev.release = release;
1779 device->dev.bus = &acpi_bus_type;
1780 fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1781 acpi_set_device_status(device, ACPI_STA_DEFAULT);
1782 acpi_device_get_busid(device);
1783 acpi_set_pnp_ids(handle, &device->pnp, type);
1784 acpi_init_properties(device);
1785 acpi_bus_get_flags(device);
1786 device->flags.match_driver = false;
1787 device->flags.initialized = true;
1788 device->flags.enumeration_by_parent =
1789 acpi_device_enumeration_by_parent(device);
1790 acpi_device_clear_enumerated(device);
1791 device_initialize(&device->dev);
1792 dev_set_uevent_suppress(&device->dev, true);
1793 acpi_init_coherency(device);
1796 static void acpi_scan_dep_init(struct acpi_device *adev)
1798 struct acpi_dep_data *dep;
1800 list_for_each_entry(dep, &acpi_dep_list, node) {
1801 if (dep->consumer == adev->handle) {
1803 adev->flags.honor_deps = 1;
1810 void acpi_device_add_finalize(struct acpi_device *device)
1812 dev_set_uevent_suppress(&device->dev, false);
1813 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1816 static void acpi_scan_init_status(struct acpi_device *adev)
1818 if (acpi_bus_get_status(adev))
1819 acpi_set_device_status(adev, 0);
1822 static int acpi_add_single_object(struct acpi_device **child,
1823 acpi_handle handle, int type, bool dep_init)
1825 struct acpi_device *device;
1826 bool release_dep_lock = false;
1829 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1833 acpi_init_device_object(device, handle, type, acpi_device_release);
1835 * Getting the status is delayed till here so that we can call
1836 * acpi_bus_get_status() and use its quirk handling. Note that
1837 * this must be done before the get power-/wakeup_dev-flags calls.
1839 if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
1841 mutex_lock(&acpi_dep_list_lock);
1843 * Hold the lock until the acpi_tie_acpi_dev() call
1844 * below to prevent concurrent acpi_scan_clear_dep()
1845 * from deleting a dependency list entry without
1846 * updating dep_unmet for the device.
1848 release_dep_lock = true;
1849 acpi_scan_dep_init(device);
1851 acpi_scan_init_status(device);
1854 acpi_bus_get_power_flags(device);
1855 acpi_bus_get_wakeup_device_flags(device);
1857 result = acpi_tie_acpi_dev(device);
1859 if (release_dep_lock)
1860 mutex_unlock(&acpi_dep_list_lock);
1863 result = acpi_device_add(device);
1866 acpi_device_release(&device->dev);
1870 acpi_power_add_remove_device(device, true);
1871 acpi_device_add_finalize(device);
1873 acpi_handle_debug(handle, "Added as %s, parent %s\n",
1874 dev_name(&device->dev), device->dev.parent ?
1875 dev_name(device->dev.parent) : "(null)");
1881 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1884 struct resource *res = context;
1886 if (acpi_dev_resource_memory(ares, res))
1887 return AE_CTRL_TERMINATE;
1892 static bool acpi_device_should_be_hidden(acpi_handle handle)
1895 struct resource res;
1897 /* Check if it should ignore the UART device */
1898 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1902 * The UART device described in SPCR table is assumed to have only one
1903 * memory resource present. So we only look for the first one here.
1905 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1906 acpi_get_resource_memory, &res);
1907 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1910 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1916 bool acpi_device_is_present(const struct acpi_device *adev)
1918 return adev->status.present || adev->status.functional;
1921 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1923 const struct acpi_device_id **matchid)
1925 const struct acpi_device_id *devid;
1928 return handler->match(idstr, matchid);
1930 for (devid = handler->ids; devid->id[0]; devid++)
1931 if (!strcmp((char *)devid->id, idstr)) {
1941 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1942 const struct acpi_device_id **matchid)
1944 struct acpi_scan_handler *handler;
1946 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1947 if (acpi_scan_handler_matching(handler, idstr, matchid))
1953 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1955 if (!!hotplug->enabled == !!val)
1958 mutex_lock(&acpi_scan_lock);
1960 hotplug->enabled = val;
1962 mutex_unlock(&acpi_scan_lock);
1965 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1967 struct acpi_hardware_id *hwid;
1969 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1970 acpi_dock_add(adev);
1973 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1974 struct acpi_scan_handler *handler;
1976 handler = acpi_scan_match_handler(hwid->id, NULL);
1978 adev->flags.hotplug_notify = true;
1984 static u32 acpi_scan_check_dep(acpi_handle handle, bool check_dep)
1986 struct acpi_handle_list dep_devices;
1992 * Check for _HID here to avoid deferring the enumeration of:
1994 * 2. ACPI nodes describing USB ports.
1995 * Still, checking for _HID catches more then just these cases ...
1997 if (!check_dep || !acpi_has_method(handle, "_DEP") ||
1998 !acpi_has_method(handle, "_HID"))
2001 status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices);
2002 if (ACPI_FAILURE(status)) {
2003 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
2007 for (count = 0, i = 0; i < dep_devices.count; i++) {
2008 struct acpi_device_info *info;
2009 struct acpi_dep_data *dep;
2010 bool skip, honor_dep;
2012 status = acpi_get_object_info(dep_devices.handles[i], &info);
2013 if (ACPI_FAILURE(status)) {
2014 acpi_handle_debug(handle, "Error reading _DEP device info\n");
2018 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
2019 honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids);
2025 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
2031 dep->supplier = dep_devices.handles[i];
2032 dep->consumer = handle;
2033 dep->honor_dep = honor_dep;
2035 mutex_lock(&acpi_dep_list_lock);
2036 list_add_tail(&dep->node , &acpi_dep_list);
2037 mutex_unlock(&acpi_dep_list_lock);
2043 static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep,
2044 struct acpi_device **adev_p)
2046 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
2047 acpi_object_type acpi_type;
2053 if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
2056 switch (acpi_type) {
2057 case ACPI_TYPE_DEVICE:
2058 if (acpi_device_should_be_hidden(handle))
2061 /* Bail out if there are dependencies. */
2062 if (acpi_scan_check_dep(handle, check_dep) > 0)
2063 return AE_CTRL_DEPTH;
2066 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
2067 type = ACPI_BUS_TYPE_DEVICE;
2070 case ACPI_TYPE_PROCESSOR:
2071 type = ACPI_BUS_TYPE_PROCESSOR;
2074 case ACPI_TYPE_THERMAL:
2075 type = ACPI_BUS_TYPE_THERMAL;
2078 case ACPI_TYPE_POWER:
2079 acpi_add_power_resource(handle);
2086 * If check_dep is true at this point, the device has no dependencies,
2087 * or the creation of the device object would have been postponed above.
2089 acpi_add_single_object(&device, handle, type, !check_dep);
2091 return AE_CTRL_DEPTH;
2093 acpi_scan_init_hotplug(device);
2102 static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
2103 void *not_used, void **ret_p)
2105 return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
2108 static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
2109 void *not_used, void **ret_p)
2111 return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
2114 static void acpi_default_enumeration(struct acpi_device *device)
2117 * Do not enumerate devices with enumeration_by_parent flag set as
2118 * they will be enumerated by their respective parents.
2120 if (!device->flags.enumeration_by_parent) {
2121 acpi_create_platform_device(device, NULL);
2122 acpi_device_set_enumerated(device);
2124 blocking_notifier_call_chain(&acpi_reconfig_chain,
2125 ACPI_RECONFIG_DEVICE_ADD, device);
2129 static const struct acpi_device_id generic_device_ids[] = {
2130 {ACPI_DT_NAMESPACE_HID, },
2134 static int acpi_generic_device_attach(struct acpi_device *adev,
2135 const struct acpi_device_id *not_used)
2138 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2139 * below can be unconditional.
2141 if (adev->data.of_compatible)
2142 acpi_default_enumeration(adev);
2147 static struct acpi_scan_handler generic_device_handler = {
2148 .ids = generic_device_ids,
2149 .attach = acpi_generic_device_attach,
2152 static int acpi_scan_attach_handler(struct acpi_device *device)
2154 struct acpi_hardware_id *hwid;
2157 list_for_each_entry(hwid, &device->pnp.ids, list) {
2158 const struct acpi_device_id *devid;
2159 struct acpi_scan_handler *handler;
2161 handler = acpi_scan_match_handler(hwid->id, &devid);
2163 if (!handler->attach) {
2164 device->pnp.type.platform_id = 0;
2167 device->handler = handler;
2168 ret = handler->attach(device, devid);
2172 device->handler = NULL;
2181 static int acpi_bus_attach(struct acpi_device *device, void *first_pass)
2183 bool skip = !first_pass && device->flags.visited;
2190 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2191 register_dock_dependent_device(device, ejd);
2193 acpi_bus_get_status(device);
2194 /* Skip devices that are not ready for enumeration (e.g. not present) */
2195 if (!acpi_dev_ready_for_enumeration(device)) {
2196 device->flags.initialized = false;
2197 acpi_device_clear_enumerated(device);
2198 device->flags.power_manageable = 0;
2201 if (device->handler)
2204 if (!device->flags.initialized) {
2205 device->flags.power_manageable =
2206 device->power.states[ACPI_STATE_D0].flags.valid;
2207 if (acpi_bus_init_power(device))
2208 device->flags.power_manageable = 0;
2210 device->flags.initialized = true;
2211 } else if (device->flags.visited) {
2215 ret = acpi_scan_attach_handler(device);
2219 device->flags.match_driver = true;
2220 if (ret > 0 && !device->flags.enumeration_by_parent) {
2221 acpi_device_set_enumerated(device);
2225 ret = device_attach(&device->dev);
2229 if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2230 acpi_default_enumeration(device);
2232 acpi_device_set_enumerated(device);
2235 acpi_dev_for_each_child(device, acpi_bus_attach, first_pass);
2237 if (!skip && device->handler && device->handler->hotplug.notify_online)
2238 device->handler->hotplug.notify_online(device);
2243 static int acpi_dev_get_next_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
2245 struct acpi_device **adev_p = data;
2246 struct acpi_device *adev = *adev_p;
2249 * If we're passed a 'previous' consumer device then we need to skip
2250 * any consumers until we meet the previous one, and then NULL @data
2251 * so the next one can be returned.
2254 if (dep->consumer == adev->handle)
2260 adev = acpi_get_acpi_dev(dep->consumer);
2262 *(struct acpi_device **)data = adev;
2265 /* Continue parsing if the device object is not present. */
2269 struct acpi_scan_clear_dep_work {
2270 struct work_struct work;
2271 struct acpi_device *adev;
2274 static void acpi_scan_clear_dep_fn(struct work_struct *work)
2276 struct acpi_scan_clear_dep_work *cdw;
2278 cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
2280 acpi_scan_lock_acquire();
2281 acpi_bus_attach(cdw->adev, (void *)true);
2282 acpi_scan_lock_release();
2284 acpi_dev_put(cdw->adev);
2288 static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
2290 struct acpi_scan_clear_dep_work *cdw;
2292 if (adev->dep_unmet)
2295 cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
2300 INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
2302 * Since the work function may block on the lock until the entire
2303 * initial enumeration of devices is complete, put it into the unbound
2306 queue_work(system_unbound_wq, &cdw->work);
2311 static void acpi_scan_delete_dep_data(struct acpi_dep_data *dep)
2313 list_del(&dep->node);
2317 static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
2319 struct acpi_device *adev = acpi_get_acpi_dev(dep->consumer);
2323 if (!acpi_scan_clear_dep_queue(adev))
2327 if (dep->free_when_met)
2328 acpi_scan_delete_dep_data(dep);
2336 * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list
2337 * @handle: The ACPI handle of the supplier device
2338 * @callback: Pointer to the callback function to apply
2339 * @data: Pointer to some data to pass to the callback
2341 * The return value of the callback determines this function's behaviour. If 0
2342 * is returned we continue to iterate over acpi_dep_list. If a positive value
2343 * is returned then the loop is broken but this function returns 0. If a
2344 * negative value is returned by the callback then the loop is broken and that
2345 * value is returned as the final error.
2347 static int acpi_walk_dep_device_list(acpi_handle handle,
2348 int (*callback)(struct acpi_dep_data *, void *),
2351 struct acpi_dep_data *dep, *tmp;
2354 mutex_lock(&acpi_dep_list_lock);
2355 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2356 if (dep->supplier == handle) {
2357 ret = callback(dep, data);
2362 mutex_unlock(&acpi_dep_list_lock);
2364 return ret > 0 ? 0 : ret;
2368 * acpi_dev_clear_dependencies - Inform consumers that the device is now active
2369 * @supplier: Pointer to the supplier &struct acpi_device
2371 * Clear dependencies on the given device.
2373 void acpi_dev_clear_dependencies(struct acpi_device *supplier)
2375 acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
2377 EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
2380 * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration
2381 * @device: Pointer to the &struct acpi_device to check
2383 * Check if the device is present and has no unmet dependencies.
2385 * Return true if the device is ready for enumeratino. Otherwise, return false.
2387 bool acpi_dev_ready_for_enumeration(const struct acpi_device *device)
2389 if (device->flags.honor_deps && device->dep_unmet)
2392 return acpi_device_is_present(device);
2394 EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);
2397 * acpi_dev_get_next_consumer_dev - Return the next adev dependent on @supplier
2398 * @supplier: Pointer to the dependee device
2399 * @start: Pointer to the current dependent device
2401 * Returns the next &struct acpi_device which declares itself dependent on
2402 * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
2404 * If the returned adev is not passed as @start to this function, the caller is
2405 * responsible for putting the reference to adev when it is no longer needed.
2407 struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier,
2408 struct acpi_device *start)
2410 struct acpi_device *adev = start;
2412 acpi_walk_dep_device_list(supplier->handle,
2413 acpi_dev_get_next_consumer_dev_cb, &adev);
2415 acpi_dev_put(start);
2422 EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev);
2424 static void acpi_scan_postponed_branch(acpi_handle handle)
2426 struct acpi_device *adev = NULL;
2428 if (ACPI_FAILURE(acpi_bus_check_add(handle, false, &adev)))
2431 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2432 acpi_bus_check_add_2, NULL, NULL, (void **)&adev);
2433 acpi_bus_attach(adev, NULL);
2436 static void acpi_scan_postponed(void)
2438 struct acpi_dep_data *dep, *tmp;
2440 mutex_lock(&acpi_dep_list_lock);
2442 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2443 acpi_handle handle = dep->consumer;
2446 * In case there are multiple acpi_dep_list entries with the
2447 * same consumer, skip the current entry if the consumer device
2448 * object corresponding to it is present already.
2450 if (!acpi_fetch_acpi_dev(handle)) {
2452 * Even though the lock is released here, tmp is
2453 * guaranteed to be valid, because none of the list
2454 * entries following dep is marked as "free when met"
2455 * and so they cannot be deleted.
2457 mutex_unlock(&acpi_dep_list_lock);
2459 acpi_scan_postponed_branch(handle);
2461 mutex_lock(&acpi_dep_list_lock);
2465 acpi_scan_delete_dep_data(dep);
2467 dep->free_when_met = true;
2470 mutex_unlock(&acpi_dep_list_lock);
2474 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2475 * @handle: Root of the namespace scope to scan.
2477 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2480 * If no devices were found, -ENODEV is returned, but it does not mean that
2481 * there has been a real error. There just have been no suitable ACPI objects
2482 * in the table trunk from which the kernel could create a device and add an
2483 * appropriate driver.
2485 * Must be called under acpi_scan_lock.
2487 int acpi_bus_scan(acpi_handle handle)
2489 struct acpi_device *device = NULL;
2491 /* Pass 1: Avoid enumerating devices with missing dependencies. */
2493 if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2494 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2495 acpi_bus_check_add_1, NULL, NULL,
2501 acpi_bus_attach(device, (void *)true);
2503 /* Pass 2: Enumerate all of the remaining devices. */
2505 acpi_scan_postponed();
2509 EXPORT_SYMBOL(acpi_bus_scan);
2511 static int acpi_bus_trim_one(struct acpi_device *adev, void *not_used)
2513 struct acpi_scan_handler *handler = adev->handler;
2515 acpi_dev_for_each_child_reverse(adev, acpi_bus_trim_one, NULL);
2517 adev->flags.match_driver = false;
2519 if (handler->detach)
2520 handler->detach(adev);
2522 adev->handler = NULL;
2524 device_release_driver(&adev->dev);
2527 * Most likely, the device is going away, so put it into D3cold before
2530 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2531 adev->flags.initialized = false;
2532 acpi_device_clear_enumerated(adev);
2538 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2539 * @adev: Root of the ACPI namespace scope to walk.
2541 * Must be called under acpi_scan_lock.
2543 void acpi_bus_trim(struct acpi_device *adev)
2545 acpi_bus_trim_one(adev, NULL);
2547 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2549 int acpi_bus_register_early_device(int type)
2551 struct acpi_device *device = NULL;
2554 result = acpi_add_single_object(&device, NULL, type, false);
2558 device->flags.match_driver = true;
2559 return device_attach(&device->dev);
2561 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2563 static void acpi_bus_scan_fixed(void)
2565 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2566 struct acpi_device *adev = NULL;
2568 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON,
2571 adev->flags.match_driver = true;
2572 if (device_attach(&adev->dev) >= 0)
2573 device_init_wakeup(&adev->dev, true);
2575 dev_dbg(&adev->dev, "No driver\n");
2579 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2580 struct acpi_device *adev = NULL;
2582 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON,
2585 adev->flags.match_driver = true;
2586 if (device_attach(&adev->dev) < 0)
2587 dev_dbg(&adev->dev, "No driver\n");
2592 static void __init acpi_get_spcr_uart_addr(void)
2595 struct acpi_table_spcr *spcr_ptr;
2597 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2598 (struct acpi_table_header **)&spcr_ptr);
2599 if (ACPI_FAILURE(status)) {
2600 pr_warn("STAO table present, but SPCR is missing\n");
2604 spcr_uart_addr = spcr_ptr->serial_port.address;
2605 acpi_put_table((struct acpi_table_header *)spcr_ptr);
2608 static bool acpi_scan_initialized;
2610 void __init acpi_scan_init(void)
2613 struct acpi_table_stao *stao_ptr;
2615 acpi_pci_root_init();
2616 acpi_pci_link_init();
2617 acpi_processor_init();
2618 acpi_platform_init();
2621 acpi_cmos_rtc_init();
2622 acpi_container_init();
2623 acpi_memory_hotplug_init();
2624 acpi_watchdog_init();
2626 acpi_int340x_thermal_init();
2629 acpi_scan_add_handler(&generic_device_handler);
2632 * If there is STAO table, check whether it needs to ignore the UART
2633 * device in SPCR table.
2635 status = acpi_get_table(ACPI_SIG_STAO, 0,
2636 (struct acpi_table_header **)&stao_ptr);
2637 if (ACPI_SUCCESS(status)) {
2638 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2639 pr_info("STAO Name List not yet supported.\n");
2641 if (stao_ptr->ignore_uart)
2642 acpi_get_spcr_uart_addr();
2644 acpi_put_table((struct acpi_table_header *)stao_ptr);
2647 acpi_gpe_apply_masked_gpes();
2648 acpi_update_all_gpes();
2651 * Although we call __add_memory() that is documented to require the
2652 * device_hotplug_lock, it is not necessary here because this is an
2653 * early code when userspace or any other code path cannot trigger
2654 * hotplug/hotunplug operations.
2656 mutex_lock(&acpi_scan_lock);
2658 * Enumerate devices in the ACPI namespace.
2660 if (acpi_bus_scan(ACPI_ROOT_OBJECT))
2663 acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);
2667 /* Fixed feature devices do not exist on HW-reduced platform */
2668 if (!acpi_gbl_reduced_hardware)
2669 acpi_bus_scan_fixed();
2671 acpi_turn_off_unused_power_resources();
2673 acpi_scan_initialized = true;
2676 mutex_unlock(&acpi_scan_lock);
2679 static struct acpi_probe_entry *ape;
2680 static int acpi_probe_count;
2681 static DEFINE_MUTEX(acpi_probe_mutex);
2683 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2684 const unsigned long end)
2686 if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2687 if (!ape->probe_subtbl(header, end))
2693 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2700 mutex_lock(&acpi_probe_mutex);
2701 for (ape = ap_head; nr; ape++, nr--) {
2702 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2703 acpi_probe_count = 0;
2704 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2705 count += acpi_probe_count;
2708 res = acpi_table_parse(ape->id, ape->probe_table);
2713 mutex_unlock(&acpi_probe_mutex);
2718 static void acpi_table_events_fn(struct work_struct *work)
2720 acpi_scan_lock_acquire();
2721 acpi_bus_scan(ACPI_ROOT_OBJECT);
2722 acpi_scan_lock_release();
2727 void acpi_scan_table_notify(void)
2729 struct work_struct *work;
2731 if (!acpi_scan_initialized)
2734 work = kmalloc(sizeof(*work), GFP_KERNEL);
2738 INIT_WORK(work, acpi_table_events_fn);
2739 schedule_work(work);
2742 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2744 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2746 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2748 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2750 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2752 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);