1
2
3
4
5
6#define pr_fmt(fmt) "ACPI: " fmt
7
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/slab.h>
11#include <linux/kernel.h>
12#include <linux/acpi.h>
13#include <linux/acpi_iort.h>
14#include <linux/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/nls.h>
20#include <linux/dma-map-ops.h>
21#include <linux/platform_data/x86/apple.h>
22#include <linux/pgtable.h>
23
24#include "internal.h"
25
26extern struct acpi_device *acpi_root;
27
28#define ACPI_BUS_CLASS "system_bus"
29#define ACPI_BUS_HID "LNXSYBUS"
30#define ACPI_BUS_DEVICE_NAME "System Bus"
31
32#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
33
34#define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
35
36static const char *dummy_hid = "device";
37
38static LIST_HEAD(acpi_dep_list);
39static DEFINE_MUTEX(acpi_dep_list_lock);
40LIST_HEAD(acpi_bus_id_list);
41static DEFINE_MUTEX(acpi_scan_lock);
42static LIST_HEAD(acpi_scan_handlers_list);
43DEFINE_MUTEX(acpi_device_lock);
44LIST_HEAD(acpi_wakeup_device_list);
45static DEFINE_MUTEX(acpi_hp_context_lock);
46
47
48
49
50
51
52static u64 spcr_uart_addr;
53
54void acpi_scan_lock_acquire(void)
55{
56 mutex_lock(&acpi_scan_lock);
57}
58EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
59
60void acpi_scan_lock_release(void)
61{
62 mutex_unlock(&acpi_scan_lock);
63}
64EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
65
66void acpi_lock_hp_context(void)
67{
68 mutex_lock(&acpi_hp_context_lock);
69}
70
71void acpi_unlock_hp_context(void)
72{
73 mutex_unlock(&acpi_hp_context_lock);
74}
75
76void 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))
80{
81 acpi_lock_hp_context();
82 hp->notify = notify;
83 hp->uevent = uevent;
84 acpi_set_hp_context(adev, hp);
85 acpi_unlock_hp_context();
86}
87EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
88
89int acpi_scan_add_handler(struct acpi_scan_handler *handler)
90{
91 if (!handler)
92 return -EINVAL;
93
94 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
95 return 0;
96}
97
98int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
99 const char *hotplug_profile_name)
100{
101 int error;
102
103 error = acpi_scan_add_handler(handler);
104 if (error)
105 return error;
106
107 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
108 return 0;
109}
110
111bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
112{
113 struct acpi_device_physical_node *pn;
114 bool offline = true;
115 char *envp[] = { "EVENT=offline", NULL };
116
117
118
119
120
121 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
122
123 list_for_each_entry(pn, &adev->physical_node_list, node)
124 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
125 if (uevent)
126 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
127
128 offline = false;
129 break;
130 }
131
132 mutex_unlock(&adev->physical_node_lock);
133 return offline;
134}
135
136static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
137 void **ret_p)
138{
139 struct acpi_device *device = NULL;
140 struct acpi_device_physical_node *pn;
141 bool second_pass = (bool)data;
142 acpi_status status = AE_OK;
143
144 if (acpi_bus_get_device(handle, &device))
145 return AE_OK;
146
147 if (device->handler && !device->handler->hotplug.enabled) {
148 *ret_p = &device->dev;
149 return AE_SUPPORT;
150 }
151
152 mutex_lock(&device->physical_node_lock);
153
154 list_for_each_entry(pn, &device->physical_node_list, node) {
155 int ret;
156
157 if (second_pass) {
158
159 if (pn->put_online)
160 continue;
161 } else {
162 pn->put_online = false;
163 }
164 ret = device_offline(pn->dev);
165 if (ret >= 0) {
166 pn->put_online = !ret;
167 } else {
168 *ret_p = pn->dev;
169 if (second_pass) {
170 status = AE_ERROR;
171 break;
172 }
173 }
174 }
175
176 mutex_unlock(&device->physical_node_lock);
177
178 return status;
179}
180
181static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
182 void **ret_p)
183{
184 struct acpi_device *device = NULL;
185 struct acpi_device_physical_node *pn;
186
187 if (acpi_bus_get_device(handle, &device))
188 return AE_OK;
189
190 mutex_lock(&device->physical_node_lock);
191
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;
196 }
197
198 mutex_unlock(&device->physical_node_lock);
199
200 return AE_OK;
201}
202
203static int acpi_scan_try_to_offline(struct acpi_device *device)
204{
205 acpi_handle handle = device->handle;
206 struct device *errdev = NULL;
207 acpi_status status;
208
209
210
211
212
213
214
215
216
217
218 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
219 NULL, acpi_bus_offline, (void *)false,
220 (void **)&errdev);
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);
225 return -EPERM;
226 }
227 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
228 if (errdev) {
229 errdev = NULL;
230 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
231 NULL, acpi_bus_offline, (void *)true,
232 (void **)&errdev);
233 if (!errdev)
234 acpi_bus_offline(handle, 0, (void *)true,
235 (void **)&errdev);
236
237 if (errdev) {
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,
242 NULL, NULL, NULL);
243 return -EBUSY;
244 }
245 }
246 return 0;
247}
248
249static int acpi_scan_hot_remove(struct acpi_device *device)
250{
251 acpi_handle handle = device->handle;
252 unsigned long long sta;
253 acpi_status status;
254
255 if (device->handler && device->handler->hotplug.demand_offline) {
256 if (!acpi_scan_is_offline(device, true))
257 return -EBUSY;
258 } else {
259 int error = acpi_scan_try_to_offline(device);
260 if (error)
261 return error;
262 }
263
264 acpi_handle_debug(handle, "Ejecting\n");
265
266 acpi_bus_trim(device);
267
268 acpi_evaluate_lck(handle, 0);
269
270
271
272 status = acpi_evaluate_ej0(handle);
273 if (status == AE_NOT_FOUND)
274 return -ENODEV;
275 else if (ACPI_FAILURE(status))
276 return -EIO;
277
278
279
280
281
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);
289 }
290
291 return 0;
292}
293
294static int acpi_scan_device_not_present(struct acpi_device *adev)
295{
296 if (!acpi_device_enumerated(adev)) {
297 dev_warn(&adev->dev, "Still not present\n");
298 return -EALREADY;
299 }
300 acpi_bus_trim(adev);
301 return 0;
302}
303
304static int acpi_scan_device_check(struct acpi_device *adev)
305{
306 int error;
307
308 acpi_bus_get_status(adev);
309 if (adev->status.present || adev->status.functional) {
310
311
312
313
314
315
316
317
318 if (adev->handler) {
319 dev_warn(&adev->dev, "Already enumerated\n");
320 return -EALREADY;
321 }
322 error = acpi_bus_scan(adev->handle);
323 if (error) {
324 dev_warn(&adev->dev, "Namespace scan failure\n");
325 return error;
326 }
327 if (!adev->handler) {
328 dev_warn(&adev->dev, "Enumeration failure\n");
329 error = -ENODEV;
330 }
331 } else {
332 error = acpi_scan_device_not_present(adev);
333 }
334 return error;
335}
336
337static int acpi_scan_bus_check(struct acpi_device *adev)
338{
339 struct acpi_scan_handler *handler = adev->handler;
340 struct acpi_device *child;
341 int error;
342
343 acpi_bus_get_status(adev);
344 if (!(adev->status.present || adev->status.functional)) {
345 acpi_scan_device_not_present(adev);
346 return 0;
347 }
348 if (handler && handler->hotplug.scan_dependent)
349 return handler->hotplug.scan_dependent(adev);
350
351 error = acpi_bus_scan(adev->handle);
352 if (error) {
353 dev_warn(&adev->dev, "Namespace scan failure\n");
354 return error;
355 }
356 list_for_each_entry(child, &adev->children, node) {
357 error = acpi_scan_bus_check(child);
358 if (error)
359 return error;
360 }
361 return 0;
362}
363
364static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
365{
366 switch (type) {
367 case ACPI_NOTIFY_BUS_CHECK:
368 return acpi_scan_bus_check(adev);
369 case ACPI_NOTIFY_DEVICE_CHECK:
370 return acpi_scan_device_check(adev);
371 case ACPI_NOTIFY_EJECT_REQUEST:
372 case ACPI_OST_EC_OSPM_EJECT:
373 if (adev->handler && !adev->handler->hotplug.enabled) {
374 dev_info(&adev->dev, "Eject disabled\n");
375 return -EPERM;
376 }
377 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
378 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
379 return acpi_scan_hot_remove(adev);
380 }
381 return -EINVAL;
382}
383
384void acpi_device_hotplug(struct acpi_device *adev, u32 src)
385{
386 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
387 int error = -ENODEV;
388
389 lock_device_hotplug();
390 mutex_lock(&acpi_scan_lock);
391
392
393
394
395
396
397 if (adev->handle == INVALID_ACPI_HANDLE)
398 goto err_out;
399
400 if (adev->flags.is_dock_station) {
401 error = dock_notify(adev, src);
402 } else if (adev->flags.hotplug_notify) {
403 error = acpi_generic_hotplug_event(adev, src);
404 } else {
405 int (*notify)(struct acpi_device *, u32);
406
407 acpi_lock_hp_context();
408 notify = adev->hp ? adev->hp->notify : NULL;
409 acpi_unlock_hp_context();
410
411
412
413
414 if (notify)
415 error = notify(adev, src);
416 else
417 goto out;
418 }
419 switch (error) {
420 case 0:
421 ost_code = ACPI_OST_SC_SUCCESS;
422 break;
423 case -EPERM:
424 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
425 break;
426 case -EBUSY:
427 ost_code = ACPI_OST_SC_DEVICE_BUSY;
428 break;
429 default:
430 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
431 break;
432 }
433
434 err_out:
435 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
436
437 out:
438 acpi_bus_put_acpi_device(adev);
439 mutex_unlock(&acpi_scan_lock);
440 unlock_device_hotplug();
441}
442
443static void acpi_free_power_resources_lists(struct acpi_device *device)
444{
445 int i;
446
447 if (device->wakeup.flags.valid)
448 acpi_power_resources_list_free(&device->wakeup.resources);
449
450 if (!device->power.flags.power_resources)
451 return;
452
453 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
454 struct acpi_device_power_state *ps = &device->power.states[i];
455 acpi_power_resources_list_free(&ps->resources);
456 }
457}
458
459static void acpi_device_release(struct device *dev)
460{
461 struct acpi_device *acpi_dev = to_acpi_device(dev);
462
463 acpi_free_properties(acpi_dev);
464 acpi_free_pnp_ids(&acpi_dev->pnp);
465 acpi_free_power_resources_lists(acpi_dev);
466 kfree(acpi_dev);
467}
468
469static void acpi_device_del(struct acpi_device *device)
470{
471 struct acpi_device_bus_id *acpi_device_bus_id;
472
473 mutex_lock(&acpi_device_lock);
474 if (device->parent)
475 list_del(&device->node);
476
477 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
478 if (!strcmp(acpi_device_bus_id->bus_id,
479 acpi_device_hid(device))) {
480 ida_simple_remove(&acpi_device_bus_id->instance_ida, device->pnp.instance_no);
481 if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
482 list_del(&acpi_device_bus_id->node);
483 kfree_const(acpi_device_bus_id->bus_id);
484 kfree(acpi_device_bus_id);
485 }
486 break;
487 }
488
489 list_del(&device->wakeup_list);
490 mutex_unlock(&acpi_device_lock);
491
492 acpi_power_add_remove_device(device, false);
493 acpi_device_remove_files(device);
494 if (device->remove)
495 device->remove(device);
496
497 device_del(&device->dev);
498}
499
500static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
501
502static LIST_HEAD(acpi_device_del_list);
503static DEFINE_MUTEX(acpi_device_del_lock);
504
505static void acpi_device_del_work_fn(struct work_struct *work_not_used)
506{
507 for (;;) {
508 struct acpi_device *adev;
509
510 mutex_lock(&acpi_device_del_lock);
511
512 if (list_empty(&acpi_device_del_list)) {
513 mutex_unlock(&acpi_device_del_lock);
514 break;
515 }
516 adev = list_first_entry(&acpi_device_del_list,
517 struct acpi_device, del_list);
518 list_del(&adev->del_list);
519
520 mutex_unlock(&acpi_device_del_lock);
521
522 blocking_notifier_call_chain(&acpi_reconfig_chain,
523 ACPI_RECONFIG_DEVICE_REMOVE, adev);
524
525 acpi_device_del(adev);
526
527
528
529
530 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
531 acpi_dev_put(adev);
532 }
533}
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548static void acpi_scan_drop_device(acpi_handle handle, void *context)
549{
550 static DECLARE_WORK(work, acpi_device_del_work_fn);
551 struct acpi_device *adev = context;
552
553 mutex_lock(&acpi_device_del_lock);
554
555
556
557
558
559
560
561
562
563
564
565 if (list_empty(&acpi_device_del_list))
566 acpi_queue_hotplug_work(&work);
567
568 list_add_tail(&adev->del_list, &acpi_device_del_list);
569
570 adev->handle = INVALID_ACPI_HANDLE;
571
572 mutex_unlock(&acpi_device_del_lock);
573}
574
575static struct acpi_device *handle_to_device(acpi_handle handle,
576 void (*callback)(void *))
577{
578 struct acpi_device *adev = NULL;
579 acpi_status status;
580
581 status = acpi_get_data_full(handle, acpi_scan_drop_device,
582 (void **)&adev, callback);
583 if (ACPI_FAILURE(status) || !adev) {
584 acpi_handle_debug(handle, "No context!\n");
585 return NULL;
586 }
587 return adev;
588}
589
590int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
591{
592 if (!device)
593 return -EINVAL;
594
595 *device = handle_to_device(handle, NULL);
596 if (!*device)
597 return -ENODEV;
598
599 return 0;
600}
601EXPORT_SYMBOL(acpi_bus_get_device);
602
603static void get_acpi_device(void *dev)
604{
605 acpi_dev_get(dev);
606}
607
608struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
609{
610 return handle_to_device(handle, get_acpi_device);
611}
612
613static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
614{
615 struct acpi_device_bus_id *acpi_device_bus_id;
616
617
618 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
619 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
620 return acpi_device_bus_id;
621 }
622 return NULL;
623}
624
625static int acpi_device_set_name(struct acpi_device *device,
626 struct acpi_device_bus_id *acpi_device_bus_id)
627{
628 struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
629 int result;
630
631 result = ida_simple_get(instance_ida, 0, ACPI_MAX_DEVICE_INSTANCES, GFP_KERNEL);
632 if (result < 0)
633 return result;
634
635 device->pnp.instance_no = result;
636 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
637 return 0;
638}
639
640static int acpi_tie_acpi_dev(struct acpi_device *adev)
641{
642 acpi_handle handle = adev->handle;
643 acpi_status status;
644
645 if (!handle)
646 return 0;
647
648 status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
649 if (ACPI_FAILURE(status)) {
650 acpi_handle_err(handle, "Unable to attach device data\n");
651 return -ENODEV;
652 }
653
654 return 0;
655}
656
657static int __acpi_device_add(struct acpi_device *device,
658 void (*release)(struct device *))
659{
660 struct acpi_device_bus_id *acpi_device_bus_id;
661 int result;
662
663
664
665
666
667
668 INIT_LIST_HEAD(&device->children);
669 INIT_LIST_HEAD(&device->node);
670 INIT_LIST_HEAD(&device->wakeup_list);
671 INIT_LIST_HEAD(&device->physical_node_list);
672 INIT_LIST_HEAD(&device->del_list);
673 mutex_init(&device->physical_node_lock);
674
675 mutex_lock(&acpi_device_lock);
676
677 acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
678 if (acpi_device_bus_id) {
679 result = acpi_device_set_name(device, acpi_device_bus_id);
680 if (result)
681 goto err_unlock;
682 } else {
683 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
684 GFP_KERNEL);
685 if (!acpi_device_bus_id) {
686 result = -ENOMEM;
687 goto err_unlock;
688 }
689 acpi_device_bus_id->bus_id =
690 kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
691 if (!acpi_device_bus_id->bus_id) {
692 kfree(acpi_device_bus_id);
693 result = -ENOMEM;
694 goto err_unlock;
695 }
696
697 ida_init(&acpi_device_bus_id->instance_ida);
698
699 result = acpi_device_set_name(device, acpi_device_bus_id);
700 if (result) {
701 kfree_const(acpi_device_bus_id->bus_id);
702 kfree(acpi_device_bus_id);
703 goto err_unlock;
704 }
705
706 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
707 }
708
709 if (device->parent)
710 list_add_tail(&device->node, &device->parent->children);
711
712 if (device->wakeup.flags.valid)
713 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
714
715 mutex_unlock(&acpi_device_lock);
716
717 if (device->parent)
718 device->dev.parent = &device->parent->dev;
719
720 device->dev.bus = &acpi_bus_type;
721 device->dev.release = release;
722 result = device_add(&device->dev);
723 if (result) {
724 dev_err(&device->dev, "Error registering device\n");
725 goto err;
726 }
727
728 result = acpi_device_setup_files(device);
729 if (result)
730 pr_err("Error creating sysfs interface for device %s\n",
731 dev_name(&device->dev));
732
733 return 0;
734
735err:
736 mutex_lock(&acpi_device_lock);
737
738 if (device->parent)
739 list_del(&device->node);
740
741 list_del(&device->wakeup_list);
742
743err_unlock:
744 mutex_unlock(&acpi_device_lock);
745
746 acpi_detach_data(device->handle, acpi_scan_drop_device);
747
748 return result;
749}
750
751int acpi_device_add(struct acpi_device *adev, void (*release)(struct device *))
752{
753 int ret;
754
755 ret = acpi_tie_acpi_dev(adev);
756 if (ret)
757 return ret;
758
759 return __acpi_device_add(adev, release);
760}
761
762
763
764
765static bool acpi_info_matches_ids(struct acpi_device_info *info,
766 const char * const ids[])
767{
768 struct acpi_pnp_device_id_list *cid_list = NULL;
769 int i, index;
770
771 if (!(info->valid & ACPI_VALID_HID))
772 return false;
773
774 index = match_string(ids, -1, info->hardware_id.string);
775 if (index >= 0)
776 return true;
777
778 if (info->valid & ACPI_VALID_CID)
779 cid_list = &info->compatible_id_list;
780
781 if (!cid_list)
782 return false;
783
784 for (i = 0; i < cid_list->count; i++) {
785 index = match_string(ids, -1, cid_list->ids[i].string);
786 if (index >= 0)
787 return true;
788 }
789
790 return false;
791}
792
793
794static const char * const acpi_ignore_dep_ids[] = {
795 "PNP0D80",
796 "INT33BD",
797 NULL
798};
799
800static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
801{
802 struct acpi_device *device = NULL;
803 acpi_status status;
804
805
806
807
808
809
810 if (!handle)
811 return acpi_root;
812
813 do {
814 status = acpi_get_parent(handle, &handle);
815 if (ACPI_FAILURE(status))
816 return status == AE_NULL_ENTRY ? NULL : acpi_root;
817 } while (acpi_bus_get_device(handle, &device));
818 return device;
819}
820
821acpi_status
822acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
823{
824 acpi_status status;
825 acpi_handle tmp;
826 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
827 union acpi_object *obj;
828
829 status = acpi_get_handle(handle, "_EJD", &tmp);
830 if (ACPI_FAILURE(status))
831 return status;
832
833 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
834 if (ACPI_SUCCESS(status)) {
835 obj = buffer.pointer;
836 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
837 ejd);
838 kfree(buffer.pointer);
839 }
840 return status;
841}
842EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
843
844static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
845{
846 acpi_handle handle = dev->handle;
847 struct acpi_device_wakeup *wakeup = &dev->wakeup;
848 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
849 union acpi_object *package = NULL;
850 union acpi_object *element = NULL;
851 acpi_status status;
852 int err = -ENODATA;
853
854 INIT_LIST_HEAD(&wakeup->resources);
855
856
857 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
858 if (ACPI_FAILURE(status)) {
859 acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
860 acpi_format_exception(status));
861 return err;
862 }
863
864 package = (union acpi_object *)buffer.pointer;
865
866 if (!package || package->package.count < 2)
867 goto out;
868
869 element = &(package->package.elements[0]);
870 if (!element)
871 goto out;
872
873 if (element->type == ACPI_TYPE_PACKAGE) {
874 if ((element->package.count < 2) ||
875 (element->package.elements[0].type !=
876 ACPI_TYPE_LOCAL_REFERENCE)
877 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
878 goto out;
879
880 wakeup->gpe_device =
881 element->package.elements[0].reference.handle;
882 wakeup->gpe_number =
883 (u32) element->package.elements[1].integer.value;
884 } else if (element->type == ACPI_TYPE_INTEGER) {
885 wakeup->gpe_device = NULL;
886 wakeup->gpe_number = element->integer.value;
887 } else {
888 goto out;
889 }
890
891 element = &(package->package.elements[1]);
892 if (element->type != ACPI_TYPE_INTEGER)
893 goto out;
894
895 wakeup->sleep_state = element->integer.value;
896
897 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
898 if (err)
899 goto out;
900
901 if (!list_empty(&wakeup->resources)) {
902 int sleep_state;
903
904 err = acpi_power_wakeup_list_init(&wakeup->resources,
905 &sleep_state);
906 if (err) {
907 acpi_handle_warn(handle, "Retrieving current states "
908 "of wakeup power resources failed\n");
909 acpi_power_resources_list_free(&wakeup->resources);
910 goto out;
911 }
912 if (sleep_state < wakeup->sleep_state) {
913 acpi_handle_warn(handle, "Overriding _PRW sleep state "
914 "(S%d) by S%d from power resources\n",
915 (int)wakeup->sleep_state, sleep_state);
916 wakeup->sleep_state = sleep_state;
917 }
918 }
919
920 out:
921 kfree(buffer.pointer);
922 return err;
923}
924
925static bool acpi_wakeup_gpe_init(struct acpi_device *device)
926{
927 static const struct acpi_device_id button_device_ids[] = {
928 {"PNP0C0C", 0},
929 {"PNP0C0D", 0},
930 {"PNP0C0E", 0},
931 {"", 0},
932 };
933 struct acpi_device_wakeup *wakeup = &device->wakeup;
934 acpi_status status;
935
936 wakeup->flags.notifier_present = 0;
937
938
939 if (!acpi_match_device_ids(device, button_device_ids)) {
940 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
941
942 if (wakeup->sleep_state == ACPI_STATE_S5)
943 wakeup->sleep_state = ACPI_STATE_S4;
944 }
945 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
946 device_set_wakeup_capable(&device->dev, true);
947 return true;
948 }
949
950 status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
951 wakeup->gpe_number);
952 return ACPI_SUCCESS(status);
953}
954
955static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
956{
957 int err;
958
959
960 if (!acpi_has_method(device->handle, "_PRW"))
961 return;
962
963 err = acpi_bus_extract_wakeup_device_power_package(device);
964 if (err) {
965 dev_err(&device->dev, "Unable to extract wakeup power resources");
966 return;
967 }
968
969 device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
970 device->wakeup.prepare_count = 0;
971
972
973
974
975
976
977
978 err = acpi_device_sleep_wake(device, 0, 0, 0);
979 if (err)
980 pr_debug("error in _DSW or _PSW evaluation\n");
981}
982
983static void acpi_bus_init_power_state(struct acpi_device *device, int state)
984{
985 struct acpi_device_power_state *ps = &device->power.states[state];
986 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
987 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
988 acpi_status status;
989
990 INIT_LIST_HEAD(&ps->resources);
991
992
993 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
994 if (ACPI_SUCCESS(status)) {
995 union acpi_object *package = buffer.pointer;
996
997 if (buffer.length && package
998 && package->type == ACPI_TYPE_PACKAGE
999 && package->package.count)
1000 acpi_extract_power_resources(package, 0, &ps->resources);
1001
1002 ACPI_FREE(buffer.pointer);
1003 }
1004
1005
1006 pathname[2] = 'S';
1007 if (acpi_has_method(device->handle, pathname))
1008 ps->flags.explicit_set = 1;
1009
1010
1011 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
1012 ps->flags.valid = 1;
1013
1014 ps->power = -1;
1015 ps->latency = -1;
1016}
1017
1018static void acpi_bus_get_power_flags(struct acpi_device *device)
1019{
1020 u32 i;
1021
1022
1023 if (!acpi_has_method(device->handle, "_PS0") &&
1024 !acpi_has_method(device->handle, "_PR0"))
1025 return;
1026
1027 device->flags.power_manageable = 1;
1028
1029
1030
1031
1032 if (acpi_has_method(device->handle, "_PSC"))
1033 device->power.flags.explicit_get = 1;
1034
1035 if (acpi_has_method(device->handle, "_IRC"))
1036 device->power.flags.inrush_current = 1;
1037
1038 if (acpi_has_method(device->handle, "_DSW"))
1039 device->power.flags.dsw_present = 1;
1040
1041
1042
1043
1044 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1045 acpi_bus_init_power_state(device, i);
1046
1047 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1048
1049
1050 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1051 device->power.states[ACPI_STATE_D0].power = 100;
1052 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1053
1054
1055
1056
1057
1058
1059 if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1060 device->power.flags.power_resources = 1;
1061
1062
1063
1064
1065 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1066 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1067 }
1068
1069 if (acpi_bus_init_power(device))
1070 device->flags.power_manageable = 0;
1071}
1072
1073static void acpi_bus_get_flags(struct acpi_device *device)
1074{
1075
1076 if (acpi_has_method(device->handle, "_STA"))
1077 device->flags.dynamic_status = 1;
1078
1079
1080 if (acpi_has_method(device->handle, "_RMV"))
1081 device->flags.removable = 1;
1082
1083
1084 if (acpi_has_method(device->handle, "_EJD") ||
1085 acpi_has_method(device->handle, "_EJ0"))
1086 device->flags.ejectable = 1;
1087}
1088
1089static void acpi_device_get_busid(struct acpi_device *device)
1090{
1091 char bus_id[5] = { '?', 0 };
1092 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1093 int i = 0;
1094
1095
1096
1097
1098
1099
1100
1101 if (ACPI_IS_ROOT_DEVICE(device)) {
1102 strcpy(device->pnp.bus_id, "ACPI");
1103 return;
1104 }
1105
1106 switch (device->device_type) {
1107 case ACPI_BUS_TYPE_POWER_BUTTON:
1108 strcpy(device->pnp.bus_id, "PWRF");
1109 break;
1110 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1111 strcpy(device->pnp.bus_id, "SLPF");
1112 break;
1113 case ACPI_BUS_TYPE_ECDT_EC:
1114 strcpy(device->pnp.bus_id, "ECDT");
1115 break;
1116 default:
1117 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1118
1119 for (i = 3; i > 1; i--) {
1120 if (bus_id[i] == '_')
1121 bus_id[i] = '\0';
1122 else
1123 break;
1124 }
1125 strcpy(device->pnp.bus_id, bus_id);
1126 break;
1127 }
1128}
1129
1130
1131
1132
1133
1134
1135
1136bool acpi_ata_match(acpi_handle handle)
1137{
1138 return acpi_has_method(handle, "_GTF") ||
1139 acpi_has_method(handle, "_GTM") ||
1140 acpi_has_method(handle, "_STM") ||
1141 acpi_has_method(handle, "_SDD");
1142}
1143
1144
1145
1146
1147
1148
1149
1150bool acpi_bay_match(acpi_handle handle)
1151{
1152 acpi_handle phandle;
1153
1154 if (!acpi_has_method(handle, "_EJ0"))
1155 return false;
1156 if (acpi_ata_match(handle))
1157 return true;
1158 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1159 return false;
1160
1161 return acpi_ata_match(phandle);
1162}
1163
1164bool acpi_device_is_battery(struct acpi_device *adev)
1165{
1166 struct acpi_hardware_id *hwid;
1167
1168 list_for_each_entry(hwid, &adev->pnp.ids, list)
1169 if (!strcmp("PNP0C0A", hwid->id))
1170 return true;
1171
1172 return false;
1173}
1174
1175static bool is_ejectable_bay(struct acpi_device *adev)
1176{
1177 acpi_handle handle = adev->handle;
1178
1179 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1180 return true;
1181
1182 return acpi_bay_match(handle);
1183}
1184
1185
1186
1187
1188bool acpi_dock_match(acpi_handle handle)
1189{
1190 return acpi_has_method(handle, "_DCK");
1191}
1192
1193static acpi_status
1194acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1195 void **return_value)
1196{
1197 long *cap = context;
1198
1199 if (acpi_has_method(handle, "_BCM") &&
1200 acpi_has_method(handle, "_BCL")) {
1201 acpi_handle_debug(handle, "Found generic backlight support\n");
1202 *cap |= ACPI_VIDEO_BACKLIGHT;
1203
1204 return AE_CTRL_TERMINATE;
1205 }
1206 return 0;
1207}
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217long acpi_is_video_device(acpi_handle handle)
1218{
1219 long video_caps = 0;
1220
1221
1222 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1223 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1224
1225
1226 if (acpi_has_method(handle, "_ROM"))
1227 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1228
1229
1230 if (acpi_has_method(handle, "_VPO") &&
1231 acpi_has_method(handle, "_GPD") &&
1232 acpi_has_method(handle, "_SPD"))
1233 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1234
1235
1236 if (video_caps)
1237 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1238 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1239 &video_caps, NULL);
1240
1241 return video_caps;
1242}
1243EXPORT_SYMBOL(acpi_is_video_device);
1244
1245const char *acpi_device_hid(struct acpi_device *device)
1246{
1247 struct acpi_hardware_id *hid;
1248
1249 if (list_empty(&device->pnp.ids))
1250 return dummy_hid;
1251
1252 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1253 return hid->id;
1254}
1255EXPORT_SYMBOL(acpi_device_hid);
1256
1257static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1258{
1259 struct acpi_hardware_id *id;
1260
1261 id = kmalloc(sizeof(*id), GFP_KERNEL);
1262 if (!id)
1263 return;
1264
1265 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1266 if (!id->id) {
1267 kfree(id);
1268 return;
1269 }
1270
1271 list_add_tail(&id->list, &pnp->ids);
1272 pnp->type.hardware_id = 1;
1273}
1274
1275
1276
1277
1278
1279
1280static bool acpi_ibm_smbus_match(acpi_handle handle)
1281{
1282 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1283 struct acpi_buffer path = { sizeof(node_name), node_name };
1284
1285 if (!dmi_name_in_vendors("IBM"))
1286 return false;
1287
1288
1289 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1290 strcmp("SMBS", path.pointer))
1291 return false;
1292
1293
1294 if (acpi_has_method(handle, "SBI") &&
1295 acpi_has_method(handle, "SBR") &&
1296 acpi_has_method(handle, "SBW"))
1297 return true;
1298
1299 return false;
1300}
1301
1302static bool acpi_object_is_system_bus(acpi_handle handle)
1303{
1304 acpi_handle tmp;
1305
1306 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1307 tmp == handle)
1308 return true;
1309 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1310 tmp == handle)
1311 return true;
1312
1313 return false;
1314}
1315
1316static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1317 int device_type)
1318{
1319 struct acpi_device_info *info = NULL;
1320 struct acpi_pnp_device_id_list *cid_list;
1321 int i;
1322
1323 switch (device_type) {
1324 case ACPI_BUS_TYPE_DEVICE:
1325 if (handle == ACPI_ROOT_OBJECT) {
1326 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1327 break;
1328 }
1329
1330 acpi_get_object_info(handle, &info);
1331 if (!info) {
1332 pr_err("%s: Error reading device info\n", __func__);
1333 return;
1334 }
1335
1336 if (info->valid & ACPI_VALID_HID) {
1337 acpi_add_id(pnp, info->hardware_id.string);
1338 pnp->type.platform_id = 1;
1339 }
1340 if (info->valid & ACPI_VALID_CID) {
1341 cid_list = &info->compatible_id_list;
1342 for (i = 0; i < cid_list->count; i++)
1343 acpi_add_id(pnp, cid_list->ids[i].string);
1344 }
1345 if (info->valid & ACPI_VALID_ADR) {
1346 pnp->bus_address = info->address;
1347 pnp->type.bus_address = 1;
1348 }
1349 if (info->valid & ACPI_VALID_UID)
1350 pnp->unique_id = kstrdup(info->unique_id.string,
1351 GFP_KERNEL);
1352 if (info->valid & ACPI_VALID_CLS)
1353 acpi_add_id(pnp, info->class_code.string);
1354
1355 kfree(info);
1356
1357
1358
1359
1360
1361 if (acpi_is_video_device(handle))
1362 acpi_add_id(pnp, ACPI_VIDEO_HID);
1363 else if (acpi_bay_match(handle))
1364 acpi_add_id(pnp, ACPI_BAY_HID);
1365 else if (acpi_dock_match(handle))
1366 acpi_add_id(pnp, ACPI_DOCK_HID);
1367 else if (acpi_ibm_smbus_match(handle))
1368 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1369 else if (list_empty(&pnp->ids) &&
1370 acpi_object_is_system_bus(handle)) {
1371
1372 acpi_add_id(pnp, ACPI_BUS_HID);
1373 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1374 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1375 }
1376
1377 break;
1378 case ACPI_BUS_TYPE_POWER:
1379 acpi_add_id(pnp, ACPI_POWER_HID);
1380 break;
1381 case ACPI_BUS_TYPE_PROCESSOR:
1382 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1383 break;
1384 case ACPI_BUS_TYPE_THERMAL:
1385 acpi_add_id(pnp, ACPI_THERMAL_HID);
1386 break;
1387 case ACPI_BUS_TYPE_POWER_BUTTON:
1388 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1389 break;
1390 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1391 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1392 break;
1393 case ACPI_BUS_TYPE_ECDT_EC:
1394 acpi_add_id(pnp, ACPI_ECDT_HID);
1395 break;
1396 }
1397}
1398
1399void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1400{
1401 struct acpi_hardware_id *id, *tmp;
1402
1403 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1404 kfree_const(id->id);
1405 kfree(id);
1406 }
1407 kfree(pnp->unique_id);
1408}
1409
1410
1411
1412
1413
1414
1415
1416bool acpi_dma_supported(const struct acpi_device *adev)
1417{
1418 if (!adev)
1419 return false;
1420
1421 if (adev->flags.cca_seen)
1422 return true;
1423
1424
1425
1426
1427
1428
1429 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1430 return true;
1431
1432 return false;
1433}
1434
1435
1436
1437
1438
1439
1440
1441enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1442{
1443 if (!acpi_dma_supported(adev))
1444 return DEV_DMA_NOT_SUPPORTED;
1445
1446 if (adev->flags.coherent_dma)
1447 return DEV_DMA_COHERENT;
1448 else
1449 return DEV_DMA_NON_COHERENT;
1450}
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1467 u64 *size)
1468{
1469 struct acpi_device *adev;
1470 LIST_HEAD(list);
1471 struct resource_entry *rentry;
1472 int ret;
1473 struct device *dma_dev = dev;
1474 u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1475
1476
1477
1478
1479
1480
1481 do {
1482 adev = ACPI_COMPANION(dma_dev);
1483 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1484 break;
1485
1486 dma_dev = dma_dev->parent;
1487 } while (dma_dev);
1488
1489 if (!dma_dev)
1490 return -ENODEV;
1491
1492 if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1493 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1494 return -EINVAL;
1495 }
1496
1497 ret = acpi_dev_get_dma_resources(adev, &list);
1498 if (ret > 0) {
1499 list_for_each_entry(rentry, &list, node) {
1500 if (dma_offset && rentry->offset != dma_offset) {
1501 ret = -EINVAL;
1502 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1503 goto out;
1504 }
1505 dma_offset = rentry->offset;
1506
1507
1508 if (rentry->res->start < dma_start)
1509 dma_start = rentry->res->start;
1510 if (rentry->res->end > dma_end)
1511 dma_end = rentry->res->end;
1512 }
1513
1514 if (dma_start >= dma_end) {
1515 ret = -EINVAL;
1516 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1517 goto out;
1518 }
1519
1520 *dma_addr = dma_start - dma_offset;
1521 len = dma_end - dma_start;
1522 *size = max(len, len + 1);
1523 *offset = dma_offset;
1524 }
1525 out:
1526 acpi_dev_free_resource_list(&list);
1527
1528 return ret >= 0 ? 0 : ret;
1529}
1530
1531#ifdef CONFIG_IOMMU_API
1532int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1533 struct fwnode_handle *fwnode,
1534 const struct iommu_ops *ops)
1535{
1536 int ret = iommu_fwspec_init(dev, fwnode, ops);
1537
1538 if (!ret)
1539 ret = iommu_fwspec_add_ids(dev, &id, 1);
1540
1541 return ret;
1542}
1543
1544static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
1545{
1546 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1547
1548 return fwspec ? fwspec->ops : NULL;
1549}
1550
1551static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
1552 const u32 *id_in)
1553{
1554 int err;
1555 const struct iommu_ops *ops;
1556
1557
1558
1559
1560
1561 ops = acpi_iommu_fwspec_ops(dev);
1562 if (ops)
1563 return ops;
1564
1565 err = iort_iommu_configure_id(dev, id_in);
1566 if (err && err != -EPROBE_DEFER)
1567 err = viot_iommu_configure(dev);
1568
1569
1570
1571
1572
1573 if (!err && dev->bus && !device_iommu_mapped(dev))
1574 err = iommu_probe_device(dev);
1575
1576
1577 if (err == -EPROBE_DEFER) {
1578 return ERR_PTR(err);
1579 } else if (err) {
1580 dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
1581 return NULL;
1582 }
1583 return acpi_iommu_fwspec_ops(dev);
1584}
1585
1586#else
1587
1588int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1589 struct fwnode_handle *fwnode,
1590 const struct iommu_ops *ops)
1591{
1592 return -ENODEV;
1593}
1594
1595static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
1596 const u32 *id_in)
1597{
1598 return NULL;
1599}
1600
1601#endif
1602
1603
1604
1605
1606
1607
1608
1609int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1610 const u32 *input_id)
1611{
1612 const struct iommu_ops *iommu;
1613 u64 dma_addr = 0, size = 0;
1614
1615 if (attr == DEV_DMA_NOT_SUPPORTED) {
1616 set_dma_ops(dev, &dma_dummy_ops);
1617 return 0;
1618 }
1619
1620 acpi_arch_dma_setup(dev, &dma_addr, &size);
1621
1622 iommu = acpi_iommu_configure_id(dev, input_id);
1623 if (PTR_ERR(iommu) == -EPROBE_DEFER)
1624 return -EPROBE_DEFER;
1625
1626 arch_setup_dma_ops(dev, dma_addr, size,
1627 iommu, attr == DEV_DMA_COHERENT);
1628
1629 return 0;
1630}
1631EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1632
1633static void acpi_init_coherency(struct acpi_device *adev)
1634{
1635 unsigned long long cca = 0;
1636 acpi_status status;
1637 struct acpi_device *parent = adev->parent;
1638
1639 if (parent && parent->flags.cca_seen) {
1640
1641
1642
1643
1644 adev->flags.cca_seen = 1;
1645 cca = parent->flags.coherent_dma;
1646 } else {
1647 status = acpi_evaluate_integer(adev->handle, "_CCA",
1648 NULL, &cca);
1649 if (ACPI_SUCCESS(status))
1650 adev->flags.cca_seen = 1;
1651 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1652
1653
1654
1655
1656
1657 cca = 1;
1658 else
1659 acpi_handle_debug(adev->handle,
1660 "ACPI device is missing _CCA.\n");
1661 }
1662
1663 adev->flags.coherent_dma = cca;
1664}
1665
1666static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1667{
1668 bool *is_serial_bus_slave_p = data;
1669
1670 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1671 return 1;
1672
1673 *is_serial_bus_slave_p = true;
1674
1675
1676 return -1;
1677}
1678
1679static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1680{
1681 struct acpi_device *parent = device->parent;
1682 static const struct acpi_device_id indirect_io_hosts[] = {
1683 {"HISI0191", 0},
1684 {}
1685 };
1686
1687 return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1688}
1689
1690static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1691{
1692 struct list_head resource_list;
1693 bool is_serial_bus_slave = false;
1694
1695
1696
1697
1698
1699
1700
1701
1702 static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
1703 {"BSG1160", },
1704 {"BSG2150", },
1705 {"INT33FE", },
1706 {"INT3515", },
1707 {}
1708 };
1709
1710 if (acpi_is_indirect_io_slave(device))
1711 return true;
1712
1713
1714 if (x86_apple_machine &&
1715 (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1716 fwnode_property_present(&device->fwnode, "i2cAddress") ||
1717 fwnode_property_present(&device->fwnode, "baud")))
1718 return true;
1719
1720
1721 if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
1722 return false;
1723
1724 INIT_LIST_HEAD(&resource_list);
1725 acpi_dev_get_resources(device, &resource_list,
1726 acpi_check_serial_bus_slave,
1727 &is_serial_bus_slave);
1728 acpi_dev_free_resource_list(&resource_list);
1729
1730 return is_serial_bus_slave;
1731}
1732
1733void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1734 int type)
1735{
1736 INIT_LIST_HEAD(&device->pnp.ids);
1737 device->device_type = type;
1738 device->handle = handle;
1739 device->parent = acpi_bus_get_parent(handle);
1740 fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1741 acpi_set_device_status(device, ACPI_STA_DEFAULT);
1742 acpi_device_get_busid(device);
1743 acpi_set_pnp_ids(handle, &device->pnp, type);
1744 acpi_init_properties(device);
1745 acpi_bus_get_flags(device);
1746 device->flags.match_driver = false;
1747 device->flags.initialized = true;
1748 device->flags.enumeration_by_parent =
1749 acpi_device_enumeration_by_parent(device);
1750 acpi_device_clear_enumerated(device);
1751 device_initialize(&device->dev);
1752 dev_set_uevent_suppress(&device->dev, true);
1753 acpi_init_coherency(device);
1754}
1755
1756static void acpi_scan_dep_init(struct acpi_device *adev)
1757{
1758 struct acpi_dep_data *dep;
1759
1760 list_for_each_entry(dep, &acpi_dep_list, node) {
1761 if (dep->consumer == adev->handle)
1762 adev->dep_unmet++;
1763 }
1764}
1765
1766void acpi_device_add_finalize(struct acpi_device *device)
1767{
1768 dev_set_uevent_suppress(&device->dev, false);
1769 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1770}
1771
1772static void acpi_scan_init_status(struct acpi_device *adev)
1773{
1774 if (acpi_bus_get_status(adev))
1775 acpi_set_device_status(adev, 0);
1776}
1777
1778static int acpi_add_single_object(struct acpi_device **child,
1779 acpi_handle handle, int type, bool dep_init)
1780{
1781 struct acpi_device *device;
1782 bool release_dep_lock = false;
1783 int result;
1784
1785 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1786 if (!device)
1787 return -ENOMEM;
1788
1789 acpi_init_device_object(device, handle, type);
1790
1791
1792
1793
1794
1795 if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
1796 if (dep_init) {
1797 mutex_lock(&acpi_dep_list_lock);
1798
1799
1800
1801
1802
1803
1804 release_dep_lock = true;
1805 acpi_scan_dep_init(device);
1806 }
1807 acpi_scan_init_status(device);
1808 }
1809
1810 acpi_bus_get_power_flags(device);
1811 acpi_bus_get_wakeup_device_flags(device);
1812
1813 result = acpi_tie_acpi_dev(device);
1814
1815 if (release_dep_lock)
1816 mutex_unlock(&acpi_dep_list_lock);
1817
1818 if (!result)
1819 result = __acpi_device_add(device, acpi_device_release);
1820
1821 if (result) {
1822 acpi_device_release(&device->dev);
1823 return result;
1824 }
1825
1826 acpi_power_add_remove_device(device, true);
1827 acpi_device_add_finalize(device);
1828
1829 acpi_handle_debug(handle, "Added as %s, parent %s\n",
1830 dev_name(&device->dev), device->parent ?
1831 dev_name(&device->parent->dev) : "(null)");
1832
1833 *child = device;
1834 return 0;
1835}
1836
1837static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1838 void *context)
1839{
1840 struct resource *res = context;
1841
1842 if (acpi_dev_resource_memory(ares, res))
1843 return AE_CTRL_TERMINATE;
1844
1845 return AE_OK;
1846}
1847
1848static bool acpi_device_should_be_hidden(acpi_handle handle)
1849{
1850 acpi_status status;
1851 struct resource res;
1852
1853
1854 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1855 return false;
1856
1857
1858
1859
1860
1861 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1862 acpi_get_resource_memory, &res);
1863 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1864 return false;
1865
1866 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1867 &res.start);
1868
1869 return true;
1870}
1871
1872bool acpi_device_is_present(const struct acpi_device *adev)
1873{
1874 return adev->status.present || adev->status.functional;
1875}
1876
1877static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1878 const char *idstr,
1879 const struct acpi_device_id **matchid)
1880{
1881 const struct acpi_device_id *devid;
1882
1883 if (handler->match)
1884 return handler->match(idstr, matchid);
1885
1886 for (devid = handler->ids; devid->id[0]; devid++)
1887 if (!strcmp((char *)devid->id, idstr)) {
1888 if (matchid)
1889 *matchid = devid;
1890
1891 return true;
1892 }
1893
1894 return false;
1895}
1896
1897static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1898 const struct acpi_device_id **matchid)
1899{
1900 struct acpi_scan_handler *handler;
1901
1902 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1903 if (acpi_scan_handler_matching(handler, idstr, matchid))
1904 return handler;
1905
1906 return NULL;
1907}
1908
1909void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1910{
1911 if (!!hotplug->enabled == !!val)
1912 return;
1913
1914 mutex_lock(&acpi_scan_lock);
1915
1916 hotplug->enabled = val;
1917
1918 mutex_unlock(&acpi_scan_lock);
1919}
1920
1921static void acpi_scan_init_hotplug(struct acpi_device *adev)
1922{
1923 struct acpi_hardware_id *hwid;
1924
1925 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1926 acpi_dock_add(adev);
1927 return;
1928 }
1929 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1930 struct acpi_scan_handler *handler;
1931
1932 handler = acpi_scan_match_handler(hwid->id, NULL);
1933 if (handler) {
1934 adev->flags.hotplug_notify = true;
1935 break;
1936 }
1937 }
1938}
1939
1940static u32 acpi_scan_check_dep(acpi_handle handle, bool check_dep)
1941{
1942 struct acpi_handle_list dep_devices;
1943 acpi_status status;
1944 u32 count;
1945 int i;
1946
1947
1948
1949
1950
1951
1952
1953 if (!check_dep || !acpi_has_method(handle, "_DEP") ||
1954 !acpi_has_method(handle, "_HID"))
1955 return 0;
1956
1957 status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices);
1958 if (ACPI_FAILURE(status)) {
1959 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
1960 return 0;
1961 }
1962
1963 for (count = 0, i = 0; i < dep_devices.count; i++) {
1964 struct acpi_device_info *info;
1965 struct acpi_dep_data *dep;
1966 bool skip;
1967
1968 status = acpi_get_object_info(dep_devices.handles[i], &info);
1969 if (ACPI_FAILURE(status)) {
1970 acpi_handle_debug(handle, "Error reading _DEP device info\n");
1971 continue;
1972 }
1973
1974 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
1975 kfree(info);
1976
1977 if (skip)
1978 continue;
1979
1980 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1981 if (!dep)
1982 continue;
1983
1984 count++;
1985
1986 dep->supplier = dep_devices.handles[i];
1987 dep->consumer = handle;
1988
1989 mutex_lock(&acpi_dep_list_lock);
1990 list_add_tail(&dep->node , &acpi_dep_list);
1991 mutex_unlock(&acpi_dep_list_lock);
1992 }
1993
1994 return count;
1995}
1996
1997static bool acpi_bus_scan_second_pass;
1998
1999static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep,
2000 struct acpi_device **adev_p)
2001{
2002 struct acpi_device *device = NULL;
2003 acpi_object_type acpi_type;
2004 int type;
2005
2006 acpi_bus_get_device(handle, &device);
2007 if (device)
2008 goto out;
2009
2010 if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
2011 return AE_OK;
2012
2013 switch (acpi_type) {
2014 case ACPI_TYPE_DEVICE:
2015 if (acpi_device_should_be_hidden(handle))
2016 return AE_OK;
2017
2018
2019 if (acpi_scan_check_dep(handle, check_dep) > 0) {
2020 acpi_bus_scan_second_pass = true;
2021 return AE_CTRL_DEPTH;
2022 }
2023
2024 fallthrough;
2025 case ACPI_TYPE_ANY:
2026 type = ACPI_BUS_TYPE_DEVICE;
2027 break;
2028
2029 case ACPI_TYPE_PROCESSOR:
2030 type = ACPI_BUS_TYPE_PROCESSOR;
2031 break;
2032
2033 case ACPI_TYPE_THERMAL:
2034 type = ACPI_BUS_TYPE_THERMAL;
2035 break;
2036
2037 case ACPI_TYPE_POWER:
2038 acpi_add_power_resource(handle);
2039 fallthrough;
2040 default:
2041 return AE_OK;
2042 }
2043
2044
2045
2046
2047
2048 acpi_add_single_object(&device, handle, type, !check_dep);
2049 if (!device)
2050 return AE_CTRL_DEPTH;
2051
2052 acpi_scan_init_hotplug(device);
2053
2054out:
2055 if (!*adev_p)
2056 *adev_p = device;
2057
2058 return AE_OK;
2059}
2060
2061static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
2062 void *not_used, void **ret_p)
2063{
2064 return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
2065}
2066
2067static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
2068 void *not_used, void **ret_p)
2069{
2070 return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
2071}
2072
2073static void acpi_default_enumeration(struct acpi_device *device)
2074{
2075
2076
2077
2078
2079 if (!device->flags.enumeration_by_parent) {
2080 acpi_create_platform_device(device, NULL);
2081 acpi_device_set_enumerated(device);
2082 } else {
2083 blocking_notifier_call_chain(&acpi_reconfig_chain,
2084 ACPI_RECONFIG_DEVICE_ADD, device);
2085 }
2086}
2087
2088static const struct acpi_device_id generic_device_ids[] = {
2089 {ACPI_DT_NAMESPACE_HID, },
2090 {"", },
2091};
2092
2093static int acpi_generic_device_attach(struct acpi_device *adev,
2094 const struct acpi_device_id *not_used)
2095{
2096
2097
2098
2099
2100 if (adev->data.of_compatible)
2101 acpi_default_enumeration(adev);
2102
2103 return 1;
2104}
2105
2106static struct acpi_scan_handler generic_device_handler = {
2107 .ids = generic_device_ids,
2108 .attach = acpi_generic_device_attach,
2109};
2110
2111static int acpi_scan_attach_handler(struct acpi_device *device)
2112{
2113 struct acpi_hardware_id *hwid;
2114 int ret = 0;
2115
2116 list_for_each_entry(hwid, &device->pnp.ids, list) {
2117 const struct acpi_device_id *devid;
2118 struct acpi_scan_handler *handler;
2119
2120 handler = acpi_scan_match_handler(hwid->id, &devid);
2121 if (handler) {
2122 if (!handler->attach) {
2123 device->pnp.type.platform_id = 0;
2124 continue;
2125 }
2126 device->handler = handler;
2127 ret = handler->attach(device, devid);
2128 if (ret > 0)
2129 break;
2130
2131 device->handler = NULL;
2132 if (ret < 0)
2133 break;
2134 }
2135 }
2136
2137 return ret;
2138}
2139
2140static void acpi_bus_attach(struct acpi_device *device, bool first_pass)
2141{
2142 struct acpi_device *child;
2143 bool skip = !first_pass && device->flags.visited;
2144 acpi_handle ejd;
2145 int ret;
2146
2147 if (skip)
2148 goto ok;
2149
2150 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2151 register_dock_dependent_device(device, ejd);
2152
2153 acpi_bus_get_status(device);
2154
2155 if (!acpi_device_is_present(device)) {
2156 device->flags.initialized = false;
2157 acpi_device_clear_enumerated(device);
2158 device->flags.power_manageable = 0;
2159 return;
2160 }
2161 if (device->handler)
2162 goto ok;
2163
2164 if (!device->flags.initialized) {
2165 device->flags.power_manageable =
2166 device->power.states[ACPI_STATE_D0].flags.valid;
2167 if (acpi_bus_init_power(device))
2168 device->flags.power_manageable = 0;
2169
2170 device->flags.initialized = true;
2171 } else if (device->flags.visited) {
2172 goto ok;
2173 }
2174
2175 ret = acpi_scan_attach_handler(device);
2176 if (ret < 0)
2177 return;
2178
2179 device->flags.match_driver = true;
2180 if (ret > 0 && !device->flags.enumeration_by_parent) {
2181 acpi_device_set_enumerated(device);
2182 goto ok;
2183 }
2184
2185 ret = device_attach(&device->dev);
2186 if (ret < 0)
2187 return;
2188
2189 if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2190 acpi_default_enumeration(device);
2191 else
2192 acpi_device_set_enumerated(device);
2193
2194 ok:
2195 list_for_each_entry(child, &device->children, node)
2196 acpi_bus_attach(child, first_pass);
2197
2198 if (!skip && device->handler && device->handler->hotplug.notify_online)
2199 device->handler->hotplug.notify_online(device);
2200}
2201
2202static int acpi_dev_get_first_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
2203{
2204 struct acpi_device *adev;
2205
2206 adev = acpi_bus_get_acpi_device(dep->consumer);
2207 if (adev) {
2208 *(struct acpi_device **)data = adev;
2209 return 1;
2210 }
2211
2212 return 0;
2213}
2214
2215struct acpi_scan_clear_dep_work {
2216 struct work_struct work;
2217 struct acpi_device *adev;
2218};
2219
2220static void acpi_scan_clear_dep_fn(struct work_struct *work)
2221{
2222 struct acpi_scan_clear_dep_work *cdw;
2223
2224 cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
2225
2226 acpi_scan_lock_acquire();
2227 acpi_bus_attach(cdw->adev, true);
2228 acpi_scan_lock_release();
2229
2230 acpi_dev_put(cdw->adev);
2231 kfree(cdw);
2232}
2233
2234static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
2235{
2236 struct acpi_scan_clear_dep_work *cdw;
2237
2238 if (adev->dep_unmet)
2239 return false;
2240
2241 cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
2242 if (!cdw)
2243 return false;
2244
2245 cdw->adev = adev;
2246 INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
2247
2248
2249
2250
2251
2252 queue_work(system_unbound_wq, &cdw->work);
2253
2254 return true;
2255}
2256
2257static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
2258{
2259 struct acpi_device *adev = acpi_bus_get_acpi_device(dep->consumer);
2260
2261 if (adev) {
2262 adev->dep_unmet--;
2263 if (!acpi_scan_clear_dep_queue(adev))
2264 acpi_dev_put(adev);
2265 }
2266
2267 list_del(&dep->node);
2268 kfree(dep);
2269
2270 return 0;
2271}
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285static int acpi_walk_dep_device_list(acpi_handle handle,
2286 int (*callback)(struct acpi_dep_data *, void *),
2287 void *data)
2288{
2289 struct acpi_dep_data *dep, *tmp;
2290 int ret = 0;
2291
2292 mutex_lock(&acpi_dep_list_lock);
2293 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2294 if (dep->supplier == handle) {
2295 ret = callback(dep, data);
2296 if (ret)
2297 break;
2298 }
2299 }
2300 mutex_unlock(&acpi_dep_list_lock);
2301
2302 return ret > 0 ? 0 : ret;
2303}
2304
2305
2306
2307
2308
2309
2310
2311void acpi_dev_clear_dependencies(struct acpi_device *supplier)
2312{
2313 acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
2314}
2315EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327struct acpi_device *acpi_dev_get_first_consumer_dev(struct acpi_device *supplier)
2328{
2329 struct acpi_device *adev = NULL;
2330
2331 acpi_walk_dep_device_list(supplier->handle,
2332 acpi_dev_get_first_consumer_dev_cb, &adev);
2333
2334 return adev;
2335}
2336EXPORT_SYMBOL_GPL(acpi_dev_get_first_consumer_dev);
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352int acpi_bus_scan(acpi_handle handle)
2353{
2354 struct acpi_device *device = NULL;
2355
2356 acpi_bus_scan_second_pass = false;
2357
2358
2359
2360 if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2361 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2362 acpi_bus_check_add_1, NULL, NULL,
2363 (void **)&device);
2364
2365 if (!device)
2366 return -ENODEV;
2367
2368 acpi_bus_attach(device, true);
2369
2370 if (!acpi_bus_scan_second_pass)
2371 return 0;
2372
2373
2374
2375 device = NULL;
2376
2377 if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device)))
2378 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2379 acpi_bus_check_add_2, NULL, NULL,
2380 (void **)&device);
2381
2382 acpi_bus_attach(device, false);
2383
2384 return 0;
2385}
2386EXPORT_SYMBOL(acpi_bus_scan);
2387
2388
2389
2390
2391
2392
2393
2394void acpi_bus_trim(struct acpi_device *adev)
2395{
2396 struct acpi_scan_handler *handler = adev->handler;
2397 struct acpi_device *child;
2398
2399 list_for_each_entry_reverse(child, &adev->children, node)
2400 acpi_bus_trim(child);
2401
2402 adev->flags.match_driver = false;
2403 if (handler) {
2404 if (handler->detach)
2405 handler->detach(adev);
2406
2407 adev->handler = NULL;
2408 } else {
2409 device_release_driver(&adev->dev);
2410 }
2411
2412
2413
2414
2415 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2416 adev->flags.initialized = false;
2417 acpi_device_clear_enumerated(adev);
2418}
2419EXPORT_SYMBOL_GPL(acpi_bus_trim);
2420
2421int acpi_bus_register_early_device(int type)
2422{
2423 struct acpi_device *device = NULL;
2424 int result;
2425
2426 result = acpi_add_single_object(&device, NULL, type, false);
2427 if (result)
2428 return result;
2429
2430 device->flags.match_driver = true;
2431 return device_attach(&device->dev);
2432}
2433EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2434
2435static int acpi_bus_scan_fixed(void)
2436{
2437 int result = 0;
2438
2439
2440
2441
2442 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2443 struct acpi_device *device = NULL;
2444
2445 result = acpi_add_single_object(&device, NULL,
2446 ACPI_BUS_TYPE_POWER_BUTTON, false);
2447 if (result)
2448 return result;
2449
2450 device->flags.match_driver = true;
2451 result = device_attach(&device->dev);
2452 if (result < 0)
2453 return result;
2454
2455 device_init_wakeup(&device->dev, true);
2456 }
2457
2458 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2459 struct acpi_device *device = NULL;
2460
2461 result = acpi_add_single_object(&device, NULL,
2462 ACPI_BUS_TYPE_SLEEP_BUTTON, false);
2463 if (result)
2464 return result;
2465
2466 device->flags.match_driver = true;
2467 result = device_attach(&device->dev);
2468 }
2469
2470 return result < 0 ? result : 0;
2471}
2472
2473static void __init acpi_get_spcr_uart_addr(void)
2474{
2475 acpi_status status;
2476 struct acpi_table_spcr *spcr_ptr;
2477
2478 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2479 (struct acpi_table_header **)&spcr_ptr);
2480 if (ACPI_FAILURE(status)) {
2481 pr_warn("STAO table present, but SPCR is missing\n");
2482 return;
2483 }
2484
2485 spcr_uart_addr = spcr_ptr->serial_port.address;
2486 acpi_put_table((struct acpi_table_header *)spcr_ptr);
2487}
2488
2489static bool acpi_scan_initialized;
2490
2491int __init acpi_scan_init(void)
2492{
2493 int result;
2494 acpi_status status;
2495 struct acpi_table_stao *stao_ptr;
2496
2497 acpi_pci_root_init();
2498 acpi_pci_link_init();
2499 acpi_processor_init();
2500 acpi_platform_init();
2501 acpi_lpss_init();
2502 acpi_apd_init();
2503 acpi_cmos_rtc_init();
2504 acpi_container_init();
2505 acpi_memory_hotplug_init();
2506 acpi_watchdog_init();
2507 acpi_pnp_init();
2508 acpi_int340x_thermal_init();
2509 acpi_amba_init();
2510 acpi_init_lpit();
2511
2512 acpi_scan_add_handler(&generic_device_handler);
2513
2514
2515
2516
2517
2518 status = acpi_get_table(ACPI_SIG_STAO, 0,
2519 (struct acpi_table_header **)&stao_ptr);
2520 if (ACPI_SUCCESS(status)) {
2521 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2522 pr_info("STAO Name List not yet supported.\n");
2523
2524 if (stao_ptr->ignore_uart)
2525 acpi_get_spcr_uart_addr();
2526
2527 acpi_put_table((struct acpi_table_header *)stao_ptr);
2528 }
2529
2530 acpi_gpe_apply_masked_gpes();
2531 acpi_update_all_gpes();
2532
2533
2534
2535
2536
2537
2538
2539 mutex_lock(&acpi_scan_lock);
2540
2541
2542
2543 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2544 if (result)
2545 goto out;
2546
2547 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2548 if (result)
2549 goto out;
2550
2551
2552 if (!acpi_gbl_reduced_hardware) {
2553 result = acpi_bus_scan_fixed();
2554 if (result) {
2555 acpi_detach_data(acpi_root->handle,
2556 acpi_scan_drop_device);
2557 acpi_device_del(acpi_root);
2558 acpi_bus_put_acpi_device(acpi_root);
2559 goto out;
2560 }
2561 }
2562
2563 acpi_turn_off_unused_power_resources();
2564
2565 acpi_scan_initialized = true;
2566
2567 out:
2568 mutex_unlock(&acpi_scan_lock);
2569 return result;
2570}
2571
2572static struct acpi_probe_entry *ape;
2573static int acpi_probe_count;
2574static DEFINE_MUTEX(acpi_probe_mutex);
2575
2576static int __init acpi_match_madt(union acpi_subtable_headers *header,
2577 const unsigned long end)
2578{
2579 if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2580 if (!ape->probe_subtbl(header, end))
2581 acpi_probe_count++;
2582
2583 return 0;
2584}
2585
2586int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2587{
2588 int count = 0;
2589
2590 if (acpi_disabled)
2591 return 0;
2592
2593 mutex_lock(&acpi_probe_mutex);
2594 for (ape = ap_head; nr; ape++, nr--) {
2595 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2596 acpi_probe_count = 0;
2597 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2598 count += acpi_probe_count;
2599 } else {
2600 int res;
2601 res = acpi_table_parse(ape->id, ape->probe_table);
2602 if (!res)
2603 count++;
2604 }
2605 }
2606 mutex_unlock(&acpi_probe_mutex);
2607
2608 return count;
2609}
2610
2611static void acpi_table_events_fn(struct work_struct *work)
2612{
2613 acpi_scan_lock_acquire();
2614 acpi_bus_scan(ACPI_ROOT_OBJECT);
2615 acpi_scan_lock_release();
2616
2617 kfree(work);
2618}
2619
2620void acpi_scan_table_notify(void)
2621{
2622 struct work_struct *work;
2623
2624 if (!acpi_scan_initialized)
2625 return;
2626
2627 work = kmalloc(sizeof(*work), GFP_KERNEL);
2628 if (!work)
2629 return;
2630
2631 INIT_WORK(work, acpi_table_events_fn);
2632 schedule_work(work);
2633}
2634
2635int acpi_reconfig_notifier_register(struct notifier_block *nb)
2636{
2637 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2638}
2639EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2640
2641int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2642{
2643 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2644}
2645EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);
2646