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/dma-map-ops.h>
20#include <linux/platform_data/x86/apple.h>
21#include <linux/pgtable.h>
22
23#include "internal.h"
24
25extern struct acpi_device *acpi_root;
26
27#define ACPI_BUS_CLASS "system_bus"
28#define ACPI_BUS_HID "LNXSYBUS"
29#define ACPI_BUS_DEVICE_NAME "System Bus"
30
31#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
32
33#define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
34
35static const char *dummy_hid = "device";
36
37static LIST_HEAD(acpi_dep_list);
38static DEFINE_MUTEX(acpi_dep_list_lock);
39LIST_HEAD(acpi_bus_id_list);
40static DEFINE_MUTEX(acpi_scan_lock);
41static LIST_HEAD(acpi_scan_handlers_list);
42DEFINE_MUTEX(acpi_device_lock);
43LIST_HEAD(acpi_wakeup_device_list);
44static DEFINE_MUTEX(acpi_hp_context_lock);
45
46
47
48
49
50
51static u64 spcr_uart_addr;
52
53void acpi_scan_lock_acquire(void)
54{
55 mutex_lock(&acpi_scan_lock);
56}
57EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
58
59void acpi_scan_lock_release(void)
60{
61 mutex_unlock(&acpi_scan_lock);
62}
63EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
64
65void acpi_lock_hp_context(void)
66{
67 mutex_lock(&acpi_hp_context_lock);
68}
69
70void acpi_unlock_hp_context(void)
71{
72 mutex_unlock(&acpi_hp_context_lock);
73}
74
75void acpi_initialize_hp_context(struct acpi_device *adev,
76 struct acpi_hotplug_context *hp,
77 int (*notify)(struct acpi_device *, u32),
78 void (*uevent)(struct acpi_device *, u32))
79{
80 acpi_lock_hp_context();
81 hp->notify = notify;
82 hp->uevent = uevent;
83 acpi_set_hp_context(adev, hp);
84 acpi_unlock_hp_context();
85}
86EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
87
88int acpi_scan_add_handler(struct acpi_scan_handler *handler)
89{
90 if (!handler)
91 return -EINVAL;
92
93 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
94 return 0;
95}
96
97int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
98 const char *hotplug_profile_name)
99{
100 int error;
101
102 error = acpi_scan_add_handler(handler);
103 if (error)
104 return error;
105
106 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
107 return 0;
108}
109
110bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
111{
112 struct acpi_device_physical_node *pn;
113 bool offline = true;
114 char *envp[] = { "EVENT=offline", NULL };
115
116
117
118
119
120 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
121
122 list_for_each_entry(pn, &adev->physical_node_list, node)
123 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
124 if (uevent)
125 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
126
127 offline = false;
128 break;
129 }
130
131 mutex_unlock(&adev->physical_node_lock);
132 return offline;
133}
134
135static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
136 void **ret_p)
137{
138 struct acpi_device *device = NULL;
139 struct acpi_device_physical_node *pn;
140 bool second_pass = (bool)data;
141 acpi_status status = AE_OK;
142
143 if (acpi_bus_get_device(handle, &device))
144 return AE_OK;
145
146 if (device->handler && !device->handler->hotplug.enabled) {
147 *ret_p = &device->dev;
148 return AE_SUPPORT;
149 }
150
151 mutex_lock(&device->physical_node_lock);
152
153 list_for_each_entry(pn, &device->physical_node_list, node) {
154 int ret;
155
156 if (second_pass) {
157
158 if (pn->put_online)
159 continue;
160 } else {
161 pn->put_online = false;
162 }
163 ret = device_offline(pn->dev);
164 if (ret >= 0) {
165 pn->put_online = !ret;
166 } else {
167 *ret_p = pn->dev;
168 if (second_pass) {
169 status = AE_ERROR;
170 break;
171 }
172 }
173 }
174
175 mutex_unlock(&device->physical_node_lock);
176
177 return status;
178}
179
180static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
181 void **ret_p)
182{
183 struct acpi_device *device = NULL;
184 struct acpi_device_physical_node *pn;
185
186 if (acpi_bus_get_device(handle, &device))
187 return AE_OK;
188
189 mutex_lock(&device->physical_node_lock);
190
191 list_for_each_entry(pn, &device->physical_node_list, node)
192 if (pn->put_online) {
193 device_online(pn->dev);
194 pn->put_online = false;
195 }
196
197 mutex_unlock(&device->physical_node_lock);
198
199 return AE_OK;
200}
201
202static int acpi_scan_try_to_offline(struct acpi_device *device)
203{
204 acpi_handle handle = device->handle;
205 struct device *errdev = NULL;
206 acpi_status status;
207
208
209
210
211
212
213
214
215
216
217 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
218 NULL, acpi_bus_offline, (void *)false,
219 (void **)&errdev);
220 if (status == AE_SUPPORT) {
221 dev_warn(errdev, "Offline disabled.\n");
222 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
223 acpi_bus_online, NULL, NULL, NULL);
224 return -EPERM;
225 }
226 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
227 if (errdev) {
228 errdev = NULL;
229 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
230 NULL, acpi_bus_offline, (void *)true,
231 (void **)&errdev);
232 if (!errdev)
233 acpi_bus_offline(handle, 0, (void *)true,
234 (void **)&errdev);
235
236 if (errdev) {
237 dev_warn(errdev, "Offline failed.\n");
238 acpi_bus_online(handle, 0, NULL, NULL);
239 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
240 ACPI_UINT32_MAX, acpi_bus_online,
241 NULL, NULL, NULL);
242 return -EBUSY;
243 }
244 }
245 return 0;
246}
247
248static int acpi_scan_hot_remove(struct acpi_device *device)
249{
250 acpi_handle handle = device->handle;
251 unsigned long long sta;
252 acpi_status status;
253
254 if (device->handler && device->handler->hotplug.demand_offline) {
255 if (!acpi_scan_is_offline(device, true))
256 return -EBUSY;
257 } else {
258 int error = acpi_scan_try_to_offline(device);
259 if (error)
260 return error;
261 }
262
263 acpi_handle_debug(handle, "Ejecting\n");
264
265 acpi_bus_trim(device);
266
267 acpi_evaluate_lck(handle, 0);
268
269
270
271 status = acpi_evaluate_ej0(handle);
272 if (status == AE_NOT_FOUND)
273 return -ENODEV;
274 else if (ACPI_FAILURE(status))
275 return -EIO;
276
277
278
279
280
281 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
282 if (ACPI_FAILURE(status)) {
283 acpi_handle_warn(handle,
284 "Status check after eject failed (0x%x)\n", status);
285 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
286 acpi_handle_warn(handle,
287 "Eject incomplete - status 0x%llx\n", sta);
288 }
289
290 return 0;
291}
292
293static int acpi_scan_device_not_present(struct acpi_device *adev)
294{
295 if (!acpi_device_enumerated(adev)) {
296 dev_warn(&adev->dev, "Still not present\n");
297 return -EALREADY;
298 }
299 acpi_bus_trim(adev);
300 return 0;
301}
302
303static int acpi_scan_device_check(struct acpi_device *adev)
304{
305 int error;
306
307 acpi_bus_get_status(adev);
308 if (adev->status.present || adev->status.functional) {
309
310
311
312
313
314
315
316
317 if (adev->handler) {
318 dev_warn(&adev->dev, "Already enumerated\n");
319 return -EALREADY;
320 }
321 error = acpi_bus_scan(adev->handle);
322 if (error) {
323 dev_warn(&adev->dev, "Namespace scan failure\n");
324 return error;
325 }
326 if (!adev->handler) {
327 dev_warn(&adev->dev, "Enumeration failure\n");
328 error = -ENODEV;
329 }
330 } else {
331 error = acpi_scan_device_not_present(adev);
332 }
333 return error;
334}
335
336static int acpi_scan_bus_check(struct acpi_device *adev)
337{
338 struct acpi_scan_handler *handler = adev->handler;
339 struct acpi_device *child;
340 int error;
341
342 acpi_bus_get_status(adev);
343 if (!(adev->status.present || adev->status.functional)) {
344 acpi_scan_device_not_present(adev);
345 return 0;
346 }
347 if (handler && handler->hotplug.scan_dependent)
348 return handler->hotplug.scan_dependent(adev);
349
350 error = acpi_bus_scan(adev->handle);
351 if (error) {
352 dev_warn(&adev->dev, "Namespace scan failure\n");
353 return error;
354 }
355 list_for_each_entry(child, &adev->children, node) {
356 error = acpi_scan_bus_check(child);
357 if (error)
358 return error;
359 }
360 return 0;
361}
362
363static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
364{
365 switch (type) {
366 case ACPI_NOTIFY_BUS_CHECK:
367 return acpi_scan_bus_check(adev);
368 case ACPI_NOTIFY_DEVICE_CHECK:
369 return acpi_scan_device_check(adev);
370 case ACPI_NOTIFY_EJECT_REQUEST:
371 case ACPI_OST_EC_OSPM_EJECT:
372 if (adev->handler && !adev->handler->hotplug.enabled) {
373 dev_info(&adev->dev, "Eject disabled\n");
374 return -EPERM;
375 }
376 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
377 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
378 return acpi_scan_hot_remove(adev);
379 }
380 return -EINVAL;
381}
382
383void acpi_device_hotplug(struct acpi_device *adev, u32 src)
384{
385 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
386 int error = -ENODEV;
387
388 lock_device_hotplug();
389 mutex_lock(&acpi_scan_lock);
390
391
392
393
394
395
396 if (adev->handle == INVALID_ACPI_HANDLE)
397 goto err_out;
398
399 if (adev->flags.is_dock_station) {
400 error = dock_notify(adev, src);
401 } else if (adev->flags.hotplug_notify) {
402 error = acpi_generic_hotplug_event(adev, src);
403 } else {
404 int (*notify)(struct acpi_device *, u32);
405
406 acpi_lock_hp_context();
407 notify = adev->hp ? adev->hp->notify : NULL;
408 acpi_unlock_hp_context();
409
410
411
412
413 if (notify)
414 error = notify(adev, src);
415 else
416 goto out;
417 }
418 switch (error) {
419 case 0:
420 ost_code = ACPI_OST_SC_SUCCESS;
421 break;
422 case -EPERM:
423 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
424 break;
425 case -EBUSY:
426 ost_code = ACPI_OST_SC_DEVICE_BUSY;
427 break;
428 default:
429 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
430 break;
431 }
432
433 err_out:
434 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
435
436 out:
437 acpi_bus_put_acpi_device(adev);
438 mutex_unlock(&acpi_scan_lock);
439 unlock_device_hotplug();
440}
441
442static void acpi_free_power_resources_lists(struct acpi_device *device)
443{
444 int i;
445
446 if (device->wakeup.flags.valid)
447 acpi_power_resources_list_free(&device->wakeup.resources);
448
449 if (!device->power.flags.power_resources)
450 return;
451
452 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
453 struct acpi_device_power_state *ps = &device->power.states[i];
454 acpi_power_resources_list_free(&ps->resources);
455 }
456}
457
458static void acpi_device_release(struct device *dev)
459{
460 struct acpi_device *acpi_dev = to_acpi_device(dev);
461
462 acpi_free_properties(acpi_dev);
463 acpi_free_pnp_ids(&acpi_dev->pnp);
464 acpi_free_power_resources_lists(acpi_dev);
465 kfree(acpi_dev);
466}
467
468static void acpi_device_del(struct acpi_device *device)
469{
470 struct acpi_device_bus_id *acpi_device_bus_id;
471
472 mutex_lock(&acpi_device_lock);
473 if (device->parent)
474 list_del(&device->node);
475
476 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
477 if (!strcmp(acpi_device_bus_id->bus_id,
478 acpi_device_hid(device))) {
479 ida_simple_remove(&acpi_device_bus_id->instance_ida, device->pnp.instance_no);
480 if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
481 list_del(&acpi_device_bus_id->node);
482 kfree_const(acpi_device_bus_id->bus_id);
483 kfree(acpi_device_bus_id);
484 }
485 break;
486 }
487
488 list_del(&device->wakeup_list);
489 mutex_unlock(&acpi_device_lock);
490
491 acpi_power_add_remove_device(device, false);
492 acpi_device_remove_files(device);
493 if (device->remove)
494 device->remove(device);
495
496 device_del(&device->dev);
497}
498
499static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
500
501static LIST_HEAD(acpi_device_del_list);
502static DEFINE_MUTEX(acpi_device_del_lock);
503
504static void acpi_device_del_work_fn(struct work_struct *work_not_used)
505{
506 for (;;) {
507 struct acpi_device *adev;
508
509 mutex_lock(&acpi_device_del_lock);
510
511 if (list_empty(&acpi_device_del_list)) {
512 mutex_unlock(&acpi_device_del_lock);
513 break;
514 }
515 adev = list_first_entry(&acpi_device_del_list,
516 struct acpi_device, del_list);
517 list_del(&adev->del_list);
518
519 mutex_unlock(&acpi_device_del_lock);
520
521 blocking_notifier_call_chain(&acpi_reconfig_chain,
522 ACPI_RECONFIG_DEVICE_REMOVE, adev);
523
524 acpi_device_del(adev);
525
526
527
528
529 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
530 acpi_dev_put(adev);
531 }
532}
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547static void acpi_scan_drop_device(acpi_handle handle, void *context)
548{
549 static DECLARE_WORK(work, acpi_device_del_work_fn);
550 struct acpi_device *adev = context;
551
552 mutex_lock(&acpi_device_del_lock);
553
554
555
556
557
558
559
560
561
562
563
564 if (list_empty(&acpi_device_del_list))
565 acpi_queue_hotplug_work(&work);
566
567 list_add_tail(&adev->del_list, &acpi_device_del_list);
568
569 adev->handle = INVALID_ACPI_HANDLE;
570
571 mutex_unlock(&acpi_device_del_lock);
572}
573
574static struct acpi_device *handle_to_device(acpi_handle handle,
575 void (*callback)(void *))
576{
577 struct acpi_device *adev = NULL;
578 acpi_status status;
579
580 status = acpi_get_data_full(handle, acpi_scan_drop_device,
581 (void **)&adev, callback);
582 if (ACPI_FAILURE(status) || !adev) {
583 acpi_handle_debug(handle, "No context!\n");
584 return NULL;
585 }
586 return adev;
587}
588
589int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
590{
591 if (!device)
592 return -EINVAL;
593
594 *device = handle_to_device(handle, NULL);
595 if (!*device)
596 return -ENODEV;
597
598 return 0;
599}
600EXPORT_SYMBOL(acpi_bus_get_device);
601
602static void get_acpi_device(void *dev)
603{
604 acpi_dev_get(dev);
605}
606
607struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
608{
609 return handle_to_device(handle, get_acpi_device);
610}
611
612static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
613{
614 struct acpi_device_bus_id *acpi_device_bus_id;
615
616
617 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
618 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
619 return acpi_device_bus_id;
620 }
621 return NULL;
622}
623
624static int acpi_device_set_name(struct acpi_device *device,
625 struct acpi_device_bus_id *acpi_device_bus_id)
626{
627 struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
628 int result;
629
630 result = ida_simple_get(instance_ida, 0, ACPI_MAX_DEVICE_INSTANCES, GFP_KERNEL);
631 if (result < 0)
632 return result;
633
634 device->pnp.instance_no = result;
635 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
636 return 0;
637}
638
639static int acpi_tie_acpi_dev(struct acpi_device *adev)
640{
641 acpi_handle handle = adev->handle;
642 acpi_status status;
643
644 if (!handle)
645 return 0;
646
647 status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
648 if (ACPI_FAILURE(status)) {
649 acpi_handle_err(handle, "Unable to attach device data\n");
650 return -ENODEV;
651 }
652
653 return 0;
654}
655
656static int __acpi_device_add(struct acpi_device *device,
657 void (*release)(struct device *))
658{
659 struct acpi_device_bus_id *acpi_device_bus_id;
660 int result;
661
662
663
664
665
666
667 INIT_LIST_HEAD(&device->children);
668 INIT_LIST_HEAD(&device->node);
669 INIT_LIST_HEAD(&device->wakeup_list);
670 INIT_LIST_HEAD(&device->physical_node_list);
671 INIT_LIST_HEAD(&device->del_list);
672 mutex_init(&device->physical_node_lock);
673
674 mutex_lock(&acpi_device_lock);
675
676 acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
677 if (acpi_device_bus_id) {
678 result = acpi_device_set_name(device, acpi_device_bus_id);
679 if (result)
680 goto err_unlock;
681 } else {
682 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
683 GFP_KERNEL);
684 if (!acpi_device_bus_id) {
685 result = -ENOMEM;
686 goto err_unlock;
687 }
688 acpi_device_bus_id->bus_id =
689 kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
690 if (!acpi_device_bus_id->bus_id) {
691 kfree(acpi_device_bus_id);
692 result = -ENOMEM;
693 goto err_unlock;
694 }
695
696 ida_init(&acpi_device_bus_id->instance_ida);
697
698 result = acpi_device_set_name(device, acpi_device_bus_id);
699 if (result) {
700 kfree_const(acpi_device_bus_id->bus_id);
701 kfree(acpi_device_bus_id);
702 goto err_unlock;
703 }
704
705 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
706 }
707
708 if (device->parent)
709 list_add_tail(&device->node, &device->parent->children);
710
711 if (device->wakeup.flags.valid)
712 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
713
714 mutex_unlock(&acpi_device_lock);
715
716 if (device->parent)
717 device->dev.parent = &device->parent->dev;
718
719 device->dev.bus = &acpi_bus_type;
720 device->dev.release = release;
721 result = device_add(&device->dev);
722 if (result) {
723 dev_err(&device->dev, "Error registering device\n");
724 goto err;
725 }
726
727 result = acpi_device_setup_files(device);
728 if (result)
729 pr_err("Error creating sysfs interface for device %s\n",
730 dev_name(&device->dev));
731
732 return 0;
733
734err:
735 mutex_lock(&acpi_device_lock);
736
737 if (device->parent)
738 list_del(&device->node);
739
740 list_del(&device->wakeup_list);
741
742err_unlock:
743 mutex_unlock(&acpi_device_lock);
744
745 acpi_detach_data(device->handle, acpi_scan_drop_device);
746
747 return result;
748}
749
750int acpi_device_add(struct acpi_device *adev, void (*release)(struct device *))
751{
752 int ret;
753
754 ret = acpi_tie_acpi_dev(adev);
755 if (ret)
756 return ret;
757
758 return __acpi_device_add(adev, release);
759}
760
761
762
763
764static bool acpi_info_matches_ids(struct acpi_device_info *info,
765 const char * const ids[])
766{
767 struct acpi_pnp_device_id_list *cid_list = NULL;
768 int i, index;
769
770 if (!(info->valid & ACPI_VALID_HID))
771 return false;
772
773 index = match_string(ids, -1, info->hardware_id.string);
774 if (index >= 0)
775 return true;
776
777 if (info->valid & ACPI_VALID_CID)
778 cid_list = &info->compatible_id_list;
779
780 if (!cid_list)
781 return false;
782
783 for (i = 0; i < cid_list->count; i++) {
784 index = match_string(ids, -1, cid_list->ids[i].string);
785 if (index >= 0)
786 return true;
787 }
788
789 return false;
790}
791
792
793static const char * const acpi_ignore_dep_ids[] = {
794 "PNP0D80",
795 "INT33BD",
796 NULL
797};
798
799static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
800{
801 struct acpi_device *device = NULL;
802 acpi_status status;
803
804
805
806
807
808
809 if (!handle)
810 return acpi_root;
811
812 do {
813 status = acpi_get_parent(handle, &handle);
814 if (ACPI_FAILURE(status))
815 return status == AE_NULL_ENTRY ? NULL : acpi_root;
816 } while (acpi_bus_get_device(handle, &device));
817 return device;
818}
819
820acpi_status
821acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
822{
823 acpi_status status;
824 acpi_handle tmp;
825 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
826 union acpi_object *obj;
827
828 status = acpi_get_handle(handle, "_EJD", &tmp);
829 if (ACPI_FAILURE(status))
830 return status;
831
832 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
833 if (ACPI_SUCCESS(status)) {
834 obj = buffer.pointer;
835 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
836 ejd);
837 kfree(buffer.pointer);
838 }
839 return status;
840}
841EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
842
843static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
844{
845 acpi_handle handle = dev->handle;
846 struct acpi_device_wakeup *wakeup = &dev->wakeup;
847 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
848 union acpi_object *package = NULL;
849 union acpi_object *element = NULL;
850 acpi_status status;
851 int err = -ENODATA;
852
853 INIT_LIST_HEAD(&wakeup->resources);
854
855
856 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
857 if (ACPI_FAILURE(status)) {
858 acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
859 acpi_format_exception(status));
860 return err;
861 }
862
863 package = (union acpi_object *)buffer.pointer;
864
865 if (!package || package->package.count < 2)
866 goto out;
867
868 element = &(package->package.elements[0]);
869 if (!element)
870 goto out;
871
872 if (element->type == ACPI_TYPE_PACKAGE) {
873 if ((element->package.count < 2) ||
874 (element->package.elements[0].type !=
875 ACPI_TYPE_LOCAL_REFERENCE)
876 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
877 goto out;
878
879 wakeup->gpe_device =
880 element->package.elements[0].reference.handle;
881 wakeup->gpe_number =
882 (u32) element->package.elements[1].integer.value;
883 } else if (element->type == ACPI_TYPE_INTEGER) {
884 wakeup->gpe_device = NULL;
885 wakeup->gpe_number = element->integer.value;
886 } else {
887 goto out;
888 }
889
890 element = &(package->package.elements[1]);
891 if (element->type != ACPI_TYPE_INTEGER)
892 goto out;
893
894 wakeup->sleep_state = element->integer.value;
895
896 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
897 if (err)
898 goto out;
899
900 if (!list_empty(&wakeup->resources)) {
901 int sleep_state;
902
903 err = acpi_power_wakeup_list_init(&wakeup->resources,
904 &sleep_state);
905 if (err) {
906 acpi_handle_warn(handle, "Retrieving current states "
907 "of wakeup power resources failed\n");
908 acpi_power_resources_list_free(&wakeup->resources);
909 goto out;
910 }
911 if (sleep_state < wakeup->sleep_state) {
912 acpi_handle_warn(handle, "Overriding _PRW sleep state "
913 "(S%d) by S%d from power resources\n",
914 (int)wakeup->sleep_state, sleep_state);
915 wakeup->sleep_state = sleep_state;
916 }
917 }
918
919 out:
920 kfree(buffer.pointer);
921 return err;
922}
923
924static bool acpi_wakeup_gpe_init(struct acpi_device *device)
925{
926 static const struct acpi_device_id button_device_ids[] = {
927 {"PNP0C0C", 0},
928 {"PNP0C0D", 0},
929 {"PNP0C0E", 0},
930 {"", 0},
931 };
932 struct acpi_device_wakeup *wakeup = &device->wakeup;
933 acpi_status status;
934
935 wakeup->flags.notifier_present = 0;
936
937
938 if (!acpi_match_device_ids(device, button_device_ids)) {
939 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
940
941 if (wakeup->sleep_state == ACPI_STATE_S5)
942 wakeup->sleep_state = ACPI_STATE_S4;
943 }
944 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
945 device_set_wakeup_capable(&device->dev, true);
946 return true;
947 }
948
949 status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
950 wakeup->gpe_number);
951 return ACPI_SUCCESS(status);
952}
953
954static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
955{
956 int err;
957
958
959 if (!acpi_has_method(device->handle, "_PRW"))
960 return;
961
962 err = acpi_bus_extract_wakeup_device_power_package(device);
963 if (err) {
964 dev_err(&device->dev, "Unable to extract wakeup power resources");
965 return;
966 }
967
968 device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
969 device->wakeup.prepare_count = 0;
970
971
972
973
974
975
976
977 err = acpi_device_sleep_wake(device, 0, 0, 0);
978 if (err)
979 pr_debug("error in _DSW or _PSW evaluation\n");
980}
981
982static void acpi_bus_init_power_state(struct acpi_device *device, int state)
983{
984 struct acpi_device_power_state *ps = &device->power.states[state];
985 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
986 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
987 acpi_status status;
988
989 INIT_LIST_HEAD(&ps->resources);
990
991
992 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
993 if (ACPI_SUCCESS(status)) {
994 union acpi_object *package = buffer.pointer;
995
996 if (buffer.length && package
997 && package->type == ACPI_TYPE_PACKAGE
998 && package->package.count)
999 acpi_extract_power_resources(package, 0, &ps->resources);
1000
1001 ACPI_FREE(buffer.pointer);
1002 }
1003
1004
1005 pathname[2] = 'S';
1006 if (acpi_has_method(device->handle, pathname))
1007 ps->flags.explicit_set = 1;
1008
1009
1010 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
1011 ps->flags.valid = 1;
1012
1013 ps->power = -1;
1014 ps->latency = -1;
1015}
1016
1017static void acpi_bus_get_power_flags(struct acpi_device *device)
1018{
1019 u32 i;
1020
1021
1022 if (!acpi_has_method(device->handle, "_PS0") &&
1023 !acpi_has_method(device->handle, "_PR0"))
1024 return;
1025
1026 device->flags.power_manageable = 1;
1027
1028
1029
1030
1031 if (acpi_has_method(device->handle, "_PSC"))
1032 device->power.flags.explicit_get = 1;
1033
1034 if (acpi_has_method(device->handle, "_IRC"))
1035 device->power.flags.inrush_current = 1;
1036
1037 if (acpi_has_method(device->handle, "_DSW"))
1038 device->power.flags.dsw_present = 1;
1039
1040
1041
1042
1043 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1044 acpi_bus_init_power_state(device, i);
1045
1046 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1047
1048
1049 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1050 device->power.states[ACPI_STATE_D0].power = 100;
1051 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1052
1053
1054
1055
1056
1057
1058 if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1059 device->power.flags.power_resources = 1;
1060
1061
1062
1063
1064 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1065 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1066 }
1067
1068 if (acpi_bus_init_power(device))
1069 device->flags.power_manageable = 0;
1070}
1071
1072static void acpi_bus_get_flags(struct acpi_device *device)
1073{
1074
1075 if (acpi_has_method(device->handle, "_STA"))
1076 device->flags.dynamic_status = 1;
1077
1078
1079 if (acpi_has_method(device->handle, "_RMV"))
1080 device->flags.removable = 1;
1081
1082
1083 if (acpi_has_method(device->handle, "_EJD") ||
1084 acpi_has_method(device->handle, "_EJ0"))
1085 device->flags.ejectable = 1;
1086}
1087
1088static void acpi_device_get_busid(struct acpi_device *device)
1089{
1090 char bus_id[5] = { '?', 0 };
1091 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1092 int i = 0;
1093
1094
1095
1096
1097
1098
1099
1100 if (ACPI_IS_ROOT_DEVICE(device)) {
1101 strcpy(device->pnp.bus_id, "ACPI");
1102 return;
1103 }
1104
1105 switch (device->device_type) {
1106 case ACPI_BUS_TYPE_POWER_BUTTON:
1107 strcpy(device->pnp.bus_id, "PWRF");
1108 break;
1109 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1110 strcpy(device->pnp.bus_id, "SLPF");
1111 break;
1112 case ACPI_BUS_TYPE_ECDT_EC:
1113 strcpy(device->pnp.bus_id, "ECDT");
1114 break;
1115 default:
1116 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1117
1118 for (i = 3; i > 1; i--) {
1119 if (bus_id[i] == '_')
1120 bus_id[i] = '\0';
1121 else
1122 break;
1123 }
1124 strcpy(device->pnp.bus_id, bus_id);
1125 break;
1126 }
1127}
1128
1129
1130
1131
1132
1133
1134
1135bool acpi_ata_match(acpi_handle handle)
1136{
1137 return acpi_has_method(handle, "_GTF") ||
1138 acpi_has_method(handle, "_GTM") ||
1139 acpi_has_method(handle, "_STM") ||
1140 acpi_has_method(handle, "_SDD");
1141}
1142
1143
1144
1145
1146
1147
1148
1149bool acpi_bay_match(acpi_handle handle)
1150{
1151 acpi_handle phandle;
1152
1153 if (!acpi_has_method(handle, "_EJ0"))
1154 return false;
1155 if (acpi_ata_match(handle))
1156 return true;
1157 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1158 return false;
1159
1160 return acpi_ata_match(phandle);
1161}
1162
1163bool acpi_device_is_battery(struct acpi_device *adev)
1164{
1165 struct acpi_hardware_id *hwid;
1166
1167 list_for_each_entry(hwid, &adev->pnp.ids, list)
1168 if (!strcmp("PNP0C0A", hwid->id))
1169 return true;
1170
1171 return false;
1172}
1173
1174static bool is_ejectable_bay(struct acpi_device *adev)
1175{
1176 acpi_handle handle = adev->handle;
1177
1178 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1179 return true;
1180
1181 return acpi_bay_match(handle);
1182}
1183
1184
1185
1186
1187bool acpi_dock_match(acpi_handle handle)
1188{
1189 return acpi_has_method(handle, "_DCK");
1190}
1191
1192static acpi_status
1193acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1194 void **return_value)
1195{
1196 long *cap = context;
1197
1198 if (acpi_has_method(handle, "_BCM") &&
1199 acpi_has_method(handle, "_BCL")) {
1200 acpi_handle_debug(handle, "Found generic backlight support\n");
1201 *cap |= ACPI_VIDEO_BACKLIGHT;
1202
1203 return AE_CTRL_TERMINATE;
1204 }
1205 return 0;
1206}
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216long acpi_is_video_device(acpi_handle handle)
1217{
1218 long video_caps = 0;
1219
1220
1221 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1222 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1223
1224
1225 if (acpi_has_method(handle, "_ROM"))
1226 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1227
1228
1229 if (acpi_has_method(handle, "_VPO") &&
1230 acpi_has_method(handle, "_GPD") &&
1231 acpi_has_method(handle, "_SPD"))
1232 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1233
1234
1235 if (video_caps)
1236 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1237 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1238 &video_caps, NULL);
1239
1240 return video_caps;
1241}
1242EXPORT_SYMBOL(acpi_is_video_device);
1243
1244const char *acpi_device_hid(struct acpi_device *device)
1245{
1246 struct acpi_hardware_id *hid;
1247
1248 if (list_empty(&device->pnp.ids))
1249 return dummy_hid;
1250
1251 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1252 return hid->id;
1253}
1254EXPORT_SYMBOL(acpi_device_hid);
1255
1256static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1257{
1258 struct acpi_hardware_id *id;
1259
1260 id = kmalloc(sizeof(*id), GFP_KERNEL);
1261 if (!id)
1262 return;
1263
1264 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1265 if (!id->id) {
1266 kfree(id);
1267 return;
1268 }
1269
1270 list_add_tail(&id->list, &pnp->ids);
1271 pnp->type.hardware_id = 1;
1272}
1273
1274
1275
1276
1277
1278
1279static bool acpi_ibm_smbus_match(acpi_handle handle)
1280{
1281 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1282 struct acpi_buffer path = { sizeof(node_name), node_name };
1283
1284 if (!dmi_name_in_vendors("IBM"))
1285 return false;
1286
1287
1288 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1289 strcmp("SMBS", path.pointer))
1290 return false;
1291
1292
1293 if (acpi_has_method(handle, "SBI") &&
1294 acpi_has_method(handle, "SBR") &&
1295 acpi_has_method(handle, "SBW"))
1296 return true;
1297
1298 return false;
1299}
1300
1301static bool acpi_object_is_system_bus(acpi_handle handle)
1302{
1303 acpi_handle tmp;
1304
1305 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1306 tmp == handle)
1307 return true;
1308 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1309 tmp == handle)
1310 return true;
1311
1312 return false;
1313}
1314
1315static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1316 int device_type)
1317{
1318 struct acpi_device_info *info = NULL;
1319 struct acpi_pnp_device_id_list *cid_list;
1320 int i;
1321
1322 switch (device_type) {
1323 case ACPI_BUS_TYPE_DEVICE:
1324 if (handle == ACPI_ROOT_OBJECT) {
1325 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1326 break;
1327 }
1328
1329 acpi_get_object_info(handle, &info);
1330 if (!info) {
1331 pr_err("%s: Error reading device info\n", __func__);
1332 return;
1333 }
1334
1335 if (info->valid & ACPI_VALID_HID) {
1336 acpi_add_id(pnp, info->hardware_id.string);
1337 pnp->type.platform_id = 1;
1338 }
1339 if (info->valid & ACPI_VALID_CID) {
1340 cid_list = &info->compatible_id_list;
1341 for (i = 0; i < cid_list->count; i++)
1342 acpi_add_id(pnp, cid_list->ids[i].string);
1343 }
1344 if (info->valid & ACPI_VALID_ADR) {
1345 pnp->bus_address = info->address;
1346 pnp->type.bus_address = 1;
1347 }
1348 if (info->valid & ACPI_VALID_UID)
1349 pnp->unique_id = kstrdup(info->unique_id.string,
1350 GFP_KERNEL);
1351 if (info->valid & ACPI_VALID_CLS)
1352 acpi_add_id(pnp, info->class_code.string);
1353
1354 kfree(info);
1355
1356
1357
1358
1359
1360 if (acpi_is_video_device(handle))
1361 acpi_add_id(pnp, ACPI_VIDEO_HID);
1362 else if (acpi_bay_match(handle))
1363 acpi_add_id(pnp, ACPI_BAY_HID);
1364 else if (acpi_dock_match(handle))
1365 acpi_add_id(pnp, ACPI_DOCK_HID);
1366 else if (acpi_ibm_smbus_match(handle))
1367 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1368 else if (list_empty(&pnp->ids) &&
1369 acpi_object_is_system_bus(handle)) {
1370
1371 acpi_add_id(pnp, ACPI_BUS_HID);
1372 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1373 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1374 }
1375
1376 break;
1377 case ACPI_BUS_TYPE_POWER:
1378 acpi_add_id(pnp, ACPI_POWER_HID);
1379 break;
1380 case ACPI_BUS_TYPE_PROCESSOR:
1381 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1382 break;
1383 case ACPI_BUS_TYPE_THERMAL:
1384 acpi_add_id(pnp, ACPI_THERMAL_HID);
1385 break;
1386 case ACPI_BUS_TYPE_POWER_BUTTON:
1387 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1388 break;
1389 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1390 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1391 break;
1392 case ACPI_BUS_TYPE_ECDT_EC:
1393 acpi_add_id(pnp, ACPI_ECDT_HID);
1394 break;
1395 }
1396}
1397
1398void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1399{
1400 struct acpi_hardware_id *id, *tmp;
1401
1402 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1403 kfree_const(id->id);
1404 kfree(id);
1405 }
1406 kfree(pnp->unique_id);
1407}
1408
1409
1410
1411
1412
1413
1414
1415bool acpi_dma_supported(const struct acpi_device *adev)
1416{
1417 if (!adev)
1418 return false;
1419
1420 if (adev->flags.cca_seen)
1421 return true;
1422
1423
1424
1425
1426
1427
1428 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1429 return true;
1430
1431 return false;
1432}
1433
1434
1435
1436
1437
1438
1439
1440enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1441{
1442 if (!acpi_dma_supported(adev))
1443 return DEV_DMA_NOT_SUPPORTED;
1444
1445 if (adev->flags.coherent_dma)
1446 return DEV_DMA_COHERENT;
1447 else
1448 return DEV_DMA_NON_COHERENT;
1449}
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1466 u64 *size)
1467{
1468 struct acpi_device *adev;
1469 LIST_HEAD(list);
1470 struct resource_entry *rentry;
1471 int ret;
1472 struct device *dma_dev = dev;
1473 u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1474
1475
1476
1477
1478
1479
1480 do {
1481 adev = ACPI_COMPANION(dma_dev);
1482 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1483 break;
1484
1485 dma_dev = dma_dev->parent;
1486 } while (dma_dev);
1487
1488 if (!dma_dev)
1489 return -ENODEV;
1490
1491 if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1492 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1493 return -EINVAL;
1494 }
1495
1496 ret = acpi_dev_get_dma_resources(adev, &list);
1497 if (ret > 0) {
1498 list_for_each_entry(rentry, &list, node) {
1499 if (dma_offset && rentry->offset != dma_offset) {
1500 ret = -EINVAL;
1501 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1502 goto out;
1503 }
1504 dma_offset = rentry->offset;
1505
1506
1507 if (rentry->res->start < dma_start)
1508 dma_start = rentry->res->start;
1509 if (rentry->res->end > dma_end)
1510 dma_end = rentry->res->end;
1511 }
1512
1513 if (dma_start >= dma_end) {
1514 ret = -EINVAL;
1515 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1516 goto out;
1517 }
1518
1519 *dma_addr = dma_start - dma_offset;
1520 len = dma_end - dma_start;
1521 *size = max(len, len + 1);
1522 *offset = dma_offset;
1523 }
1524 out:
1525 acpi_dev_free_resource_list(&list);
1526
1527 return ret >= 0 ? 0 : ret;
1528}
1529
1530#ifdef CONFIG_IOMMU_API
1531int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1532 struct fwnode_handle *fwnode,
1533 const struct iommu_ops *ops)
1534{
1535 int ret = iommu_fwspec_init(dev, fwnode, ops);
1536
1537 if (!ret)
1538 ret = iommu_fwspec_add_ids(dev, &id, 1);
1539
1540 return ret;
1541}
1542
1543static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
1544{
1545 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1546
1547 return fwspec ? fwspec->ops : NULL;
1548}
1549
1550static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
1551 const u32 *id_in)
1552{
1553 int err;
1554 const struct iommu_ops *ops;
1555
1556
1557
1558
1559
1560 ops = acpi_iommu_fwspec_ops(dev);
1561 if (ops)
1562 return ops;
1563
1564 err = iort_iommu_configure_id(dev, id_in);
1565 if (err && err != -EPROBE_DEFER)
1566 err = viot_iommu_configure(dev);
1567
1568
1569
1570
1571
1572 if (!err && dev->bus && !device_iommu_mapped(dev))
1573 err = iommu_probe_device(dev);
1574
1575
1576 if (err == -EPROBE_DEFER) {
1577 return ERR_PTR(err);
1578 } else if (err) {
1579 dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
1580 return NULL;
1581 }
1582 return acpi_iommu_fwspec_ops(dev);
1583}
1584
1585#else
1586
1587int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1588 struct fwnode_handle *fwnode,
1589 const struct iommu_ops *ops)
1590{
1591 return -ENODEV;
1592}
1593
1594static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
1595 const u32 *id_in)
1596{
1597 return NULL;
1598}
1599
1600#endif
1601
1602
1603
1604
1605
1606
1607
1608int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1609 const u32 *input_id)
1610{
1611 const struct iommu_ops *iommu;
1612 u64 dma_addr = 0, size = 0;
1613
1614 if (attr == DEV_DMA_NOT_SUPPORTED) {
1615 set_dma_ops(dev, &dma_dummy_ops);
1616 return 0;
1617 }
1618
1619 acpi_arch_dma_setup(dev, &dma_addr, &size);
1620
1621 iommu = acpi_iommu_configure_id(dev, input_id);
1622 if (PTR_ERR(iommu) == -EPROBE_DEFER)
1623 return -EPROBE_DEFER;
1624
1625 arch_setup_dma_ops(dev, dma_addr, size,
1626 iommu, attr == DEV_DMA_COHERENT);
1627
1628 return 0;
1629}
1630EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1631
1632static void acpi_init_coherency(struct acpi_device *adev)
1633{
1634 unsigned long long cca = 0;
1635 acpi_status status;
1636 struct acpi_device *parent = adev->parent;
1637
1638 if (parent && parent->flags.cca_seen) {
1639
1640
1641
1642
1643 adev->flags.cca_seen = 1;
1644 cca = parent->flags.coherent_dma;
1645 } else {
1646 status = acpi_evaluate_integer(adev->handle, "_CCA",
1647 NULL, &cca);
1648 if (ACPI_SUCCESS(status))
1649 adev->flags.cca_seen = 1;
1650 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1651
1652
1653
1654
1655
1656 cca = 1;
1657 else
1658 acpi_handle_debug(adev->handle,
1659 "ACPI device is missing _CCA.\n");
1660 }
1661
1662 adev->flags.coherent_dma = cca;
1663}
1664
1665static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1666{
1667 bool *is_serial_bus_slave_p = data;
1668
1669 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1670 return 1;
1671
1672 *is_serial_bus_slave_p = true;
1673
1674
1675 return -1;
1676}
1677
1678static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1679{
1680 struct acpi_device *parent = device->parent;
1681 static const struct acpi_device_id indirect_io_hosts[] = {
1682 {"HISI0191", 0},
1683 {}
1684 };
1685
1686 return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1687}
1688
1689static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1690{
1691 struct list_head resource_list;
1692 bool is_serial_bus_slave = false;
1693
1694
1695
1696
1697
1698
1699
1700
1701 static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
1702 {"BSG1160", },
1703 {"BSG2150", },
1704 {"INT33FE", },
1705 {"INT3515", },
1706 {}
1707 };
1708
1709 if (acpi_is_indirect_io_slave(device))
1710 return true;
1711
1712
1713 if (x86_apple_machine &&
1714 (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1715 fwnode_property_present(&device->fwnode, "i2cAddress") ||
1716 fwnode_property_present(&device->fwnode, "baud")))
1717 return true;
1718
1719
1720 if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
1721 return false;
1722
1723 INIT_LIST_HEAD(&resource_list);
1724 acpi_dev_get_resources(device, &resource_list,
1725 acpi_check_serial_bus_slave,
1726 &is_serial_bus_slave);
1727 acpi_dev_free_resource_list(&resource_list);
1728
1729 return is_serial_bus_slave;
1730}
1731
1732void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1733 int type)
1734{
1735 INIT_LIST_HEAD(&device->pnp.ids);
1736 device->device_type = type;
1737 device->handle = handle;
1738 device->parent = acpi_bus_get_parent(handle);
1739 fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1740 acpi_set_device_status(device, ACPI_STA_DEFAULT);
1741 acpi_device_get_busid(device);
1742 acpi_set_pnp_ids(handle, &device->pnp, type);
1743 acpi_init_properties(device);
1744 acpi_bus_get_flags(device);
1745 device->flags.match_driver = false;
1746 device->flags.initialized = true;
1747 device->flags.enumeration_by_parent =
1748 acpi_device_enumeration_by_parent(device);
1749 acpi_device_clear_enumerated(device);
1750 device_initialize(&device->dev);
1751 dev_set_uevent_suppress(&device->dev, true);
1752 acpi_init_coherency(device);
1753}
1754
1755static void acpi_scan_dep_init(struct acpi_device *adev)
1756{
1757 struct acpi_dep_data *dep;
1758
1759 list_for_each_entry(dep, &acpi_dep_list, node) {
1760 if (dep->consumer == adev->handle)
1761 adev->dep_unmet++;
1762 }
1763}
1764
1765void acpi_device_add_finalize(struct acpi_device *device)
1766{
1767 dev_set_uevent_suppress(&device->dev, false);
1768 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1769}
1770
1771static void acpi_scan_init_status(struct acpi_device *adev)
1772{
1773 if (acpi_bus_get_status(adev))
1774 acpi_set_device_status(adev, 0);
1775}
1776
1777static int acpi_add_single_object(struct acpi_device **child,
1778 acpi_handle handle, int type, bool dep_init)
1779{
1780 struct acpi_device *device;
1781 bool release_dep_lock = false;
1782 int result;
1783
1784 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1785 if (!device)
1786 return -ENOMEM;
1787
1788 acpi_init_device_object(device, handle, type);
1789
1790
1791
1792
1793
1794 if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
1795 if (dep_init) {
1796 mutex_lock(&acpi_dep_list_lock);
1797
1798
1799
1800
1801
1802
1803 release_dep_lock = true;
1804 acpi_scan_dep_init(device);
1805 }
1806 acpi_scan_init_status(device);
1807 }
1808
1809 acpi_bus_get_power_flags(device);
1810 acpi_bus_get_wakeup_device_flags(device);
1811
1812 result = acpi_tie_acpi_dev(device);
1813
1814 if (release_dep_lock)
1815 mutex_unlock(&acpi_dep_list_lock);
1816
1817 if (!result)
1818 result = __acpi_device_add(device, acpi_device_release);
1819
1820 if (result) {
1821 acpi_device_release(&device->dev);
1822 return result;
1823 }
1824
1825 acpi_power_add_remove_device(device, true);
1826 acpi_device_add_finalize(device);
1827
1828 acpi_handle_debug(handle, "Added as %s, parent %s\n",
1829 dev_name(&device->dev), device->parent ?
1830 dev_name(&device->parent->dev) : "(null)");
1831
1832 *child = device;
1833 return 0;
1834}
1835
1836static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1837 void *context)
1838{
1839 struct resource *res = context;
1840
1841 if (acpi_dev_resource_memory(ares, res))
1842 return AE_CTRL_TERMINATE;
1843
1844 return AE_OK;
1845}
1846
1847static bool acpi_device_should_be_hidden(acpi_handle handle)
1848{
1849 acpi_status status;
1850 struct resource res;
1851
1852
1853 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1854 return false;
1855
1856
1857
1858
1859
1860 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1861 acpi_get_resource_memory, &res);
1862 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1863 return false;
1864
1865 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1866 &res.start);
1867
1868 return true;
1869}
1870
1871bool acpi_device_is_present(const struct acpi_device *adev)
1872{
1873 return adev->status.present || adev->status.functional;
1874}
1875
1876static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1877 const char *idstr,
1878 const struct acpi_device_id **matchid)
1879{
1880 const struct acpi_device_id *devid;
1881
1882 if (handler->match)
1883 return handler->match(idstr, matchid);
1884
1885 for (devid = handler->ids; devid->id[0]; devid++)
1886 if (!strcmp((char *)devid->id, idstr)) {
1887 if (matchid)
1888 *matchid = devid;
1889
1890 return true;
1891 }
1892
1893 return false;
1894}
1895
1896static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1897 const struct acpi_device_id **matchid)
1898{
1899 struct acpi_scan_handler *handler;
1900
1901 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1902 if (acpi_scan_handler_matching(handler, idstr, matchid))
1903 return handler;
1904
1905 return NULL;
1906}
1907
1908void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1909{
1910 if (!!hotplug->enabled == !!val)
1911 return;
1912
1913 mutex_lock(&acpi_scan_lock);
1914
1915 hotplug->enabled = val;
1916
1917 mutex_unlock(&acpi_scan_lock);
1918}
1919
1920static void acpi_scan_init_hotplug(struct acpi_device *adev)
1921{
1922 struct acpi_hardware_id *hwid;
1923
1924 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1925 acpi_dock_add(adev);
1926 return;
1927 }
1928 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1929 struct acpi_scan_handler *handler;
1930
1931 handler = acpi_scan_match_handler(hwid->id, NULL);
1932 if (handler) {
1933 adev->flags.hotplug_notify = true;
1934 break;
1935 }
1936 }
1937}
1938
1939static u32 acpi_scan_check_dep(acpi_handle handle, bool check_dep)
1940{
1941 struct acpi_handle_list dep_devices;
1942 acpi_status status;
1943 u32 count;
1944 int i;
1945
1946
1947
1948
1949
1950
1951
1952 if (!check_dep || !acpi_has_method(handle, "_DEP") ||
1953 !acpi_has_method(handle, "_HID"))
1954 return 0;
1955
1956 status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices);
1957 if (ACPI_FAILURE(status)) {
1958 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
1959 return 0;
1960 }
1961
1962 for (count = 0, i = 0; i < dep_devices.count; i++) {
1963 struct acpi_device_info *info;
1964 struct acpi_dep_data *dep;
1965 bool skip;
1966
1967 status = acpi_get_object_info(dep_devices.handles[i], &info);
1968 if (ACPI_FAILURE(status)) {
1969 acpi_handle_debug(handle, "Error reading _DEP device info\n");
1970 continue;
1971 }
1972
1973 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
1974 kfree(info);
1975
1976 if (skip)
1977 continue;
1978
1979 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1980 if (!dep)
1981 continue;
1982
1983 count++;
1984
1985 dep->supplier = dep_devices.handles[i];
1986 dep->consumer = handle;
1987
1988 mutex_lock(&acpi_dep_list_lock);
1989 list_add_tail(&dep->node , &acpi_dep_list);
1990 mutex_unlock(&acpi_dep_list_lock);
1991 }
1992
1993 return count;
1994}
1995
1996static bool acpi_bus_scan_second_pass;
1997
1998static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep,
1999 struct acpi_device **adev_p)
2000{
2001 struct acpi_device *device = NULL;
2002 acpi_object_type acpi_type;
2003 int type;
2004
2005 acpi_bus_get_device(handle, &device);
2006 if (device)
2007 goto out;
2008
2009 if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
2010 return AE_OK;
2011
2012 switch (acpi_type) {
2013 case ACPI_TYPE_DEVICE:
2014 if (acpi_device_should_be_hidden(handle))
2015 return AE_OK;
2016
2017
2018 if (acpi_scan_check_dep(handle, check_dep) > 0) {
2019 acpi_bus_scan_second_pass = true;
2020 return AE_CTRL_DEPTH;
2021 }
2022
2023 fallthrough;
2024 case ACPI_TYPE_ANY:
2025 type = ACPI_BUS_TYPE_DEVICE;
2026 break;
2027
2028 case ACPI_TYPE_PROCESSOR:
2029 type = ACPI_BUS_TYPE_PROCESSOR;
2030 break;
2031
2032 case ACPI_TYPE_THERMAL:
2033 type = ACPI_BUS_TYPE_THERMAL;
2034 break;
2035
2036 case ACPI_TYPE_POWER:
2037 acpi_add_power_resource(handle);
2038 fallthrough;
2039 default:
2040 return AE_OK;
2041 }
2042
2043
2044
2045
2046
2047 acpi_add_single_object(&device, handle, type, !check_dep);
2048 if (!device)
2049 return AE_CTRL_DEPTH;
2050
2051 acpi_scan_init_hotplug(device);
2052
2053out:
2054 if (!*adev_p)
2055 *adev_p = device;
2056
2057 return AE_OK;
2058}
2059
2060static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
2061 void *not_used, void **ret_p)
2062{
2063 return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
2064}
2065
2066static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
2067 void *not_used, void **ret_p)
2068{
2069 return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
2070}
2071
2072static void acpi_default_enumeration(struct acpi_device *device)
2073{
2074
2075
2076
2077
2078 if (!device->flags.enumeration_by_parent) {
2079 acpi_create_platform_device(device, NULL);
2080 acpi_device_set_enumerated(device);
2081 } else {
2082 blocking_notifier_call_chain(&acpi_reconfig_chain,
2083 ACPI_RECONFIG_DEVICE_ADD, device);
2084 }
2085}
2086
2087static const struct acpi_device_id generic_device_ids[] = {
2088 {ACPI_DT_NAMESPACE_HID, },
2089 {"", },
2090};
2091
2092static int acpi_generic_device_attach(struct acpi_device *adev,
2093 const struct acpi_device_id *not_used)
2094{
2095
2096
2097
2098
2099 if (adev->data.of_compatible)
2100 acpi_default_enumeration(adev);
2101
2102 return 1;
2103}
2104
2105static struct acpi_scan_handler generic_device_handler = {
2106 .ids = generic_device_ids,
2107 .attach = acpi_generic_device_attach,
2108};
2109
2110static int acpi_scan_attach_handler(struct acpi_device *device)
2111{
2112 struct acpi_hardware_id *hwid;
2113 int ret = 0;
2114
2115 list_for_each_entry(hwid, &device->pnp.ids, list) {
2116 const struct acpi_device_id *devid;
2117 struct acpi_scan_handler *handler;
2118
2119 handler = acpi_scan_match_handler(hwid->id, &devid);
2120 if (handler) {
2121 if (!handler->attach) {
2122 device->pnp.type.platform_id = 0;
2123 continue;
2124 }
2125 device->handler = handler;
2126 ret = handler->attach(device, devid);
2127 if (ret > 0)
2128 break;
2129
2130 device->handler = NULL;
2131 if (ret < 0)
2132 break;
2133 }
2134 }
2135
2136 return ret;
2137}
2138
2139static void acpi_bus_attach(struct acpi_device *device, bool first_pass)
2140{
2141 struct acpi_device *child;
2142 bool skip = !first_pass && device->flags.visited;
2143 acpi_handle ejd;
2144 int ret;
2145
2146 if (skip)
2147 goto ok;
2148
2149 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2150 register_dock_dependent_device(device, ejd);
2151
2152 acpi_bus_get_status(device);
2153
2154 if (!acpi_device_is_present(device)) {
2155 device->flags.initialized = false;
2156 acpi_device_clear_enumerated(device);
2157 device->flags.power_manageable = 0;
2158 return;
2159 }
2160 if (device->handler)
2161 goto ok;
2162
2163 if (!device->flags.initialized) {
2164 device->flags.power_manageable =
2165 device->power.states[ACPI_STATE_D0].flags.valid;
2166 if (acpi_bus_init_power(device))
2167 device->flags.power_manageable = 0;
2168
2169 device->flags.initialized = true;
2170 } else if (device->flags.visited) {
2171 goto ok;
2172 }
2173
2174 ret = acpi_scan_attach_handler(device);
2175 if (ret < 0)
2176 return;
2177
2178 device->flags.match_driver = true;
2179 if (ret > 0 && !device->flags.enumeration_by_parent) {
2180 acpi_device_set_enumerated(device);
2181 goto ok;
2182 }
2183
2184 ret = device_attach(&device->dev);
2185 if (ret < 0)
2186 return;
2187
2188 if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2189 acpi_default_enumeration(device);
2190 else
2191 acpi_device_set_enumerated(device);
2192
2193 ok:
2194 list_for_each_entry(child, &device->children, node)
2195 acpi_bus_attach(child, first_pass);
2196
2197 if (!skip && device->handler && device->handler->hotplug.notify_online)
2198 device->handler->hotplug.notify_online(device);
2199}
2200
2201static int acpi_dev_get_first_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
2202{
2203 struct acpi_device *adev;
2204
2205 adev = acpi_bus_get_acpi_device(dep->consumer);
2206 if (adev) {
2207 *(struct acpi_device **)data = adev;
2208 return 1;
2209 }
2210
2211 return 0;
2212}
2213
2214struct acpi_scan_clear_dep_work {
2215 struct work_struct work;
2216 struct acpi_device *adev;
2217};
2218
2219static void acpi_scan_clear_dep_fn(struct work_struct *work)
2220{
2221 struct acpi_scan_clear_dep_work *cdw;
2222
2223 cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
2224
2225 acpi_scan_lock_acquire();
2226 acpi_bus_attach(cdw->adev, true);
2227 acpi_scan_lock_release();
2228
2229 acpi_dev_put(cdw->adev);
2230 kfree(cdw);
2231}
2232
2233static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
2234{
2235 struct acpi_scan_clear_dep_work *cdw;
2236
2237 if (adev->dep_unmet)
2238 return false;
2239
2240 cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
2241 if (!cdw)
2242 return false;
2243
2244 cdw->adev = adev;
2245 INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
2246
2247
2248
2249
2250
2251 queue_work(system_unbound_wq, &cdw->work);
2252
2253 return true;
2254}
2255
2256static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
2257{
2258 struct acpi_device *adev = acpi_bus_get_acpi_device(dep->consumer);
2259
2260 if (adev) {
2261 adev->dep_unmet--;
2262 if (!acpi_scan_clear_dep_queue(adev))
2263 acpi_dev_put(adev);
2264 }
2265
2266 list_del(&dep->node);
2267 kfree(dep);
2268
2269 return 0;
2270}
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284static int acpi_walk_dep_device_list(acpi_handle handle,
2285 int (*callback)(struct acpi_dep_data *, void *),
2286 void *data)
2287{
2288 struct acpi_dep_data *dep, *tmp;
2289 int ret = 0;
2290
2291 mutex_lock(&acpi_dep_list_lock);
2292 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2293 if (dep->supplier == handle) {
2294 ret = callback(dep, data);
2295 if (ret)
2296 break;
2297 }
2298 }
2299 mutex_unlock(&acpi_dep_list_lock);
2300
2301 return ret > 0 ? 0 : ret;
2302}
2303
2304
2305
2306
2307
2308
2309
2310void acpi_dev_clear_dependencies(struct acpi_device *supplier)
2311{
2312 acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
2313}
2314EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326struct acpi_device *acpi_dev_get_first_consumer_dev(struct acpi_device *supplier)
2327{
2328 struct acpi_device *adev = NULL;
2329
2330 acpi_walk_dep_device_list(supplier->handle,
2331 acpi_dev_get_first_consumer_dev_cb, &adev);
2332
2333 return adev;
2334}
2335EXPORT_SYMBOL_GPL(acpi_dev_get_first_consumer_dev);
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351int acpi_bus_scan(acpi_handle handle)
2352{
2353 struct acpi_device *device = NULL;
2354
2355 acpi_bus_scan_second_pass = false;
2356
2357
2358
2359 if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2360 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2361 acpi_bus_check_add_1, NULL, NULL,
2362 (void **)&device);
2363
2364 if (!device)
2365 return -ENODEV;
2366
2367 acpi_bus_attach(device, true);
2368
2369 if (!acpi_bus_scan_second_pass)
2370 return 0;
2371
2372
2373
2374 device = NULL;
2375
2376 if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device)))
2377 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2378 acpi_bus_check_add_2, NULL, NULL,
2379 (void **)&device);
2380
2381 acpi_bus_attach(device, false);
2382
2383 return 0;
2384}
2385EXPORT_SYMBOL(acpi_bus_scan);
2386
2387
2388
2389
2390
2391
2392
2393void acpi_bus_trim(struct acpi_device *adev)
2394{
2395 struct acpi_scan_handler *handler = adev->handler;
2396 struct acpi_device *child;
2397
2398 list_for_each_entry_reverse(child, &adev->children, node)
2399 acpi_bus_trim(child);
2400
2401 adev->flags.match_driver = false;
2402 if (handler) {
2403 if (handler->detach)
2404 handler->detach(adev);
2405
2406 adev->handler = NULL;
2407 } else {
2408 device_release_driver(&adev->dev);
2409 }
2410
2411
2412
2413
2414 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2415 adev->flags.initialized = false;
2416 acpi_device_clear_enumerated(adev);
2417}
2418EXPORT_SYMBOL_GPL(acpi_bus_trim);
2419
2420int acpi_bus_register_early_device(int type)
2421{
2422 struct acpi_device *device = NULL;
2423 int result;
2424
2425 result = acpi_add_single_object(&device, NULL, type, false);
2426 if (result)
2427 return result;
2428
2429 device->flags.match_driver = true;
2430 return device_attach(&device->dev);
2431}
2432EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2433
2434static int acpi_bus_scan_fixed(void)
2435{
2436 int result = 0;
2437
2438
2439
2440
2441 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2442 struct acpi_device *device = NULL;
2443
2444 result = acpi_add_single_object(&device, NULL,
2445 ACPI_BUS_TYPE_POWER_BUTTON, false);
2446 if (result)
2447 return result;
2448
2449 device->flags.match_driver = true;
2450 result = device_attach(&device->dev);
2451 if (result < 0)
2452 return result;
2453
2454 device_init_wakeup(&device->dev, true);
2455 }
2456
2457 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2458 struct acpi_device *device = NULL;
2459
2460 result = acpi_add_single_object(&device, NULL,
2461 ACPI_BUS_TYPE_SLEEP_BUTTON, false);
2462 if (result)
2463 return result;
2464
2465 device->flags.match_driver = true;
2466 result = device_attach(&device->dev);
2467 }
2468
2469 return result < 0 ? result : 0;
2470}
2471
2472static void __init acpi_get_spcr_uart_addr(void)
2473{
2474 acpi_status status;
2475 struct acpi_table_spcr *spcr_ptr;
2476
2477 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2478 (struct acpi_table_header **)&spcr_ptr);
2479 if (ACPI_FAILURE(status)) {
2480 pr_warn("STAO table present, but SPCR is missing\n");
2481 return;
2482 }
2483
2484 spcr_uart_addr = spcr_ptr->serial_port.address;
2485 acpi_put_table((struct acpi_table_header *)spcr_ptr);
2486}
2487
2488static bool acpi_scan_initialized;
2489
2490int __init acpi_scan_init(void)
2491{
2492 int result;
2493 acpi_status status;
2494 struct acpi_table_stao *stao_ptr;
2495
2496 acpi_pci_root_init();
2497 acpi_pci_link_init();
2498 acpi_processor_init();
2499 acpi_platform_init();
2500 acpi_lpss_init();
2501 acpi_apd_init();
2502 acpi_cmos_rtc_init();
2503 acpi_container_init();
2504 acpi_memory_hotplug_init();
2505 acpi_watchdog_init();
2506 acpi_pnp_init();
2507 acpi_int340x_thermal_init();
2508 acpi_amba_init();
2509 acpi_init_lpit();
2510
2511 acpi_scan_add_handler(&generic_device_handler);
2512
2513
2514
2515
2516
2517 status = acpi_get_table(ACPI_SIG_STAO, 0,
2518 (struct acpi_table_header **)&stao_ptr);
2519 if (ACPI_SUCCESS(status)) {
2520 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2521 pr_info("STAO Name List not yet supported.\n");
2522
2523 if (stao_ptr->ignore_uart)
2524 acpi_get_spcr_uart_addr();
2525
2526 acpi_put_table((struct acpi_table_header *)stao_ptr);
2527 }
2528
2529 acpi_gpe_apply_masked_gpes();
2530 acpi_update_all_gpes();
2531
2532
2533
2534
2535
2536
2537
2538 mutex_lock(&acpi_scan_lock);
2539
2540
2541
2542 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2543 if (result)
2544 goto out;
2545
2546 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2547 if (result)
2548 goto out;
2549
2550
2551 if (!acpi_gbl_reduced_hardware) {
2552 result = acpi_bus_scan_fixed();
2553 if (result) {
2554 acpi_detach_data(acpi_root->handle,
2555 acpi_scan_drop_device);
2556 acpi_device_del(acpi_root);
2557 acpi_bus_put_acpi_device(acpi_root);
2558 goto out;
2559 }
2560 }
2561
2562 acpi_turn_off_unused_power_resources();
2563
2564 acpi_scan_initialized = true;
2565
2566 out:
2567 mutex_unlock(&acpi_scan_lock);
2568 return result;
2569}
2570
2571static struct acpi_probe_entry *ape;
2572static int acpi_probe_count;
2573static DEFINE_MUTEX(acpi_probe_mutex);
2574
2575static int __init acpi_match_madt(union acpi_subtable_headers *header,
2576 const unsigned long end)
2577{
2578 if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2579 if (!ape->probe_subtbl(header, end))
2580 acpi_probe_count++;
2581
2582 return 0;
2583}
2584
2585int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2586{
2587 int count = 0;
2588
2589 if (acpi_disabled)
2590 return 0;
2591
2592 mutex_lock(&acpi_probe_mutex);
2593 for (ape = ap_head; nr; ape++, nr--) {
2594 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2595 acpi_probe_count = 0;
2596 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2597 count += acpi_probe_count;
2598 } else {
2599 int res;
2600 res = acpi_table_parse(ape->id, ape->probe_table);
2601 if (!res)
2602 count++;
2603 }
2604 }
2605 mutex_unlock(&acpi_probe_mutex);
2606
2607 return count;
2608}
2609
2610static void acpi_table_events_fn(struct work_struct *work)
2611{
2612 acpi_scan_lock_acquire();
2613 acpi_bus_scan(ACPI_ROOT_OBJECT);
2614 acpi_scan_lock_release();
2615
2616 kfree(work);
2617}
2618
2619void acpi_scan_table_notify(void)
2620{
2621 struct work_struct *work;
2622
2623 if (!acpi_scan_initialized)
2624 return;
2625
2626 work = kmalloc(sizeof(*work), GFP_KERNEL);
2627 if (!work)
2628 return;
2629
2630 INIT_WORK(work, acpi_table_events_fn);
2631 schedule_work(work);
2632}
2633
2634int acpi_reconfig_notifier_register(struct notifier_block *nb)
2635{
2636 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2637}
2638EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2639
2640int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2641{
2642 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2643}
2644EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);
2645