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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * scan.c - support for transforming the ACPI namespace into individual objects
4 */
5
6#define pr_fmt(fmt) "ACPI: " fmt
7
8#include <linux/async.h>
9#include <linux/auxiliary_bus.h>
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/slab.h>
13#include <linux/kernel.h>
14#include <linux/acpi.h>
15#include <linux/acpi_iort.h>
16#include <linux/acpi_rimt.h>
17#include <linux/acpi_viot.h>
18#include <linux/iommu.h>
19#include <linux/signal.h>
20#include <linux/kthread.h>
21#include <linux/dmi.h>
22#include <linux/dma-map-ops.h>
23#include <linux/platform_data/x86/apple.h>
24#include <linux/pgtable.h>
25#include <linux/crc32.h>
26#include <linux/dma-direct.h>
27
28#include "internal.h"
29#include "sleep.h"
30
31#define ACPI_BUS_HID "LNXSYBUS"
32
33#define INVALID_ACPI_HANDLE ((acpi_handle)ZERO_PAGE(0))
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);
45static LIST_HEAD(acpi_scan_system_dev_list);
46
47/*
48 * The UART device described by the SPCR table is the only object which needs
49 * special-casing. Everything else is covered by ACPI namespace paths in STAO
50 * table.
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 acpi_hp_notify notify, acpi_hp_uevent uevent)
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 * acpi_container_offline() calls this for all of the container's
118 * children under the container's physical_node_lock lock.
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) && !dev_offline(pn->dev)) {
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 = acpi_fetch_acpi_dev(handle);
139 struct acpi_device_physical_node *pn;
140 bool second_pass = (bool)data;
141 acpi_status status = AE_OK;
142
143 if (!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 /* Skip devices offlined by the first pass. */
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 = acpi_fetch_acpi_dev(handle);
184 struct acpi_device_physical_node *pn;
185
186 if (!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 * Carry out two passes here and ignore errors in the first pass,
210 * because if the devices in question are memory blocks and
211 * CONFIG_MEMCG is set, one of the blocks may hold data structures
212 * that the other blocks depend on, but it is not known in advance which
213 * block holds them.
214 *
215 * If the first pass is successful, the second one isn't needed, though.
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
248#define ACPI_SCAN_CHECK_FLAG_STATUS BIT(0)
249#define ACPI_SCAN_CHECK_FLAG_EJECT BIT(1)
250
251static int acpi_scan_check_and_detach(struct acpi_device *adev, void *p)
252{
253 struct acpi_scan_handler *handler = adev->handler;
254 uintptr_t flags = (uintptr_t)p;
255
256 acpi_dev_for_each_child_reverse(adev, acpi_scan_check_and_detach, p);
257
258 if (flags & ACPI_SCAN_CHECK_FLAG_STATUS) {
259 acpi_bus_get_status(adev);
260 /*
261 * Skip devices that are still there and take the enabled
262 * flag into account.
263 */
264 if (acpi_device_is_enabled(adev))
265 return 0;
266
267 /* Skip device that have not been enumerated. */
268 if (!acpi_device_enumerated(adev)) {
269 dev_dbg(&adev->dev, "Still not enumerated\n");
270 return 0;
271 }
272 }
273
274 if (handler && handler->detach)
275 handler->detach(adev);
276
277 /*
278 * Most likely, the device is going away, so put it into D3cold before
279 * that.
280 */
281 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
282 adev->flags.initialized = false;
283
284 /* For eject this is deferred to acpi_bus_post_eject() */
285 if (!(flags & ACPI_SCAN_CHECK_FLAG_EJECT)) {
286 adev->handler = NULL;
287 acpi_device_clear_enumerated(adev);
288 }
289 return 0;
290}
291
292static int acpi_bus_post_eject(struct acpi_device *adev, void *not_used)
293{
294 struct acpi_scan_handler *handler = adev->handler;
295
296 acpi_dev_for_each_child_reverse(adev, acpi_bus_post_eject, NULL);
297
298 if (handler) {
299 if (handler->post_eject)
300 handler->post_eject(adev);
301
302 adev->handler = NULL;
303 }
304
305 acpi_device_clear_enumerated(adev);
306
307 return 0;
308}
309
310static void acpi_scan_check_subtree(struct acpi_device *adev)
311{
312 uintptr_t flags = ACPI_SCAN_CHECK_FLAG_STATUS;
313
314 acpi_scan_check_and_detach(adev, (void *)flags);
315}
316
317static int acpi_scan_hot_remove(struct acpi_device *device)
318{
319 acpi_handle handle = device->handle;
320 unsigned long long sta;
321 acpi_status status;
322 uintptr_t flags = ACPI_SCAN_CHECK_FLAG_EJECT;
323
324 if (device->handler && device->handler->hotplug.demand_offline) {
325 if (!acpi_scan_is_offline(device, true))
326 return -EBUSY;
327 } else {
328 int error = acpi_scan_try_to_offline(device);
329 if (error)
330 return error;
331 }
332
333 acpi_handle_debug(handle, "Ejecting\n");
334
335 acpi_scan_check_and_detach(device, (void *)flags);
336
337 acpi_evaluate_lck(handle, 0);
338 /*
339 * TBD: _EJD support.
340 */
341 status = acpi_evaluate_ej0(handle);
342 if (status == AE_NOT_FOUND)
343 return -ENODEV;
344 else if (ACPI_FAILURE(status))
345 return -EIO;
346
347 /*
348 * Verify if eject was indeed successful. If not, log an error
349 * message. No need to call _OST since _EJ0 call was made OK.
350 */
351 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
352 if (ACPI_FAILURE(status)) {
353 acpi_handle_warn(handle,
354 "Status check after eject failed (0x%x)\n", status);
355 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
356 acpi_handle_warn(handle,
357 "Eject incomplete - status 0x%llx\n", sta);
358 } else {
359 acpi_bus_post_eject(device, NULL);
360 }
361
362 return 0;
363}
364
365static int acpi_scan_rescan_bus(struct acpi_device *adev)
366{
367 struct acpi_scan_handler *handler = adev->handler;
368 int ret;
369
370 if (handler && handler->hotplug.scan_dependent)
371 ret = handler->hotplug.scan_dependent(adev);
372 else
373 ret = acpi_bus_scan(adev->handle);
374
375 if (ret)
376 dev_info(&adev->dev, "Namespace scan failure\n");
377
378 return ret;
379}
380
381static int acpi_scan_device_check(struct acpi_device *adev)
382{
383 struct acpi_device *parent;
384
385 acpi_scan_check_subtree(adev);
386
387 if (!acpi_device_is_present(adev))
388 return 0;
389
390 /*
391 * This function is only called for device objects for which matching
392 * scan handlers exist. The only situation in which the scan handler
393 * is not attached to this device object yet is when the device has
394 * just appeared (either it wasn't present at all before or it was
395 * removed and then added again).
396 */
397 if (adev->handler) {
398 dev_dbg(&adev->dev, "Already enumerated\n");
399 return 0;
400 }
401
402 parent = acpi_dev_parent(adev);
403 if (!parent)
404 parent = adev;
405
406 return acpi_scan_rescan_bus(parent);
407}
408
409static int acpi_scan_bus_check(struct acpi_device *adev)
410{
411 acpi_scan_check_subtree(adev);
412
413 return acpi_scan_rescan_bus(adev);
414}
415
416static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
417{
418 switch (type) {
419 case ACPI_NOTIFY_BUS_CHECK:
420 return acpi_scan_bus_check(adev);
421 case ACPI_NOTIFY_DEVICE_CHECK:
422 return acpi_scan_device_check(adev);
423 case ACPI_NOTIFY_EJECT_REQUEST:
424 case ACPI_OST_EC_OSPM_EJECT:
425 if (adev->handler && !adev->handler->hotplug.enabled) {
426 dev_info(&adev->dev, "Eject disabled\n");
427 return -EPERM;
428 }
429 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
430 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
431 return acpi_scan_hot_remove(adev);
432 }
433 return -EINVAL;
434}
435
436void acpi_device_hotplug(struct acpi_device *adev, u32 src)
437{
438 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
439 int error = -ENODEV;
440
441 lock_device_hotplug();
442 mutex_lock(&acpi_scan_lock);
443
444 /*
445 * The device object's ACPI handle cannot become invalid as long as we
446 * are holding acpi_scan_lock, but it might have become invalid before
447 * that lock was acquired.
448 */
449 if (adev->handle == INVALID_ACPI_HANDLE)
450 goto err_out;
451
452 if (adev->flags.is_dock_station) {
453 error = dock_notify(adev, src);
454 } else if (adev->flags.hotplug_notify) {
455 error = acpi_generic_hotplug_event(adev, src);
456 } else {
457 acpi_hp_notify notify;
458
459 acpi_lock_hp_context();
460 notify = adev->hp ? adev->hp->notify : NULL;
461 acpi_unlock_hp_context();
462 /*
463 * There may be additional notify handlers for device objects
464 * without the .event() callback, so ignore them here.
465 */
466 if (notify)
467 error = notify(adev, src);
468 else
469 goto out;
470 }
471 switch (error) {
472 case 0:
473 ost_code = ACPI_OST_SC_SUCCESS;
474 break;
475 case -EPERM:
476 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
477 break;
478 case -EBUSY:
479 ost_code = ACPI_OST_SC_DEVICE_BUSY;
480 break;
481 default:
482 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
483 break;
484 }
485
486 err_out:
487 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
488
489 out:
490 acpi_put_acpi_dev(adev);
491 mutex_unlock(&acpi_scan_lock);
492 unlock_device_hotplug();
493}
494
495static void acpi_free_power_resources_lists(struct acpi_device *device)
496{
497 int i;
498
499 if (device->wakeup.flags.valid)
500 acpi_power_resources_list_free(&device->wakeup.resources);
501
502 if (!device->power.flags.power_resources)
503 return;
504
505 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
506 struct acpi_device_power_state *ps = &device->power.states[i];
507 acpi_power_resources_list_free(&ps->resources);
508 }
509}
510
511static void acpi_device_release(struct device *dev)
512{
513 struct acpi_device *acpi_dev = to_acpi_device(dev);
514
515 acpi_free_properties(acpi_dev);
516 acpi_free_pnp_ids(&acpi_dev->pnp);
517 acpi_free_power_resources_lists(acpi_dev);
518 kfree(acpi_dev);
519}
520
521static void acpi_device_cleanup(struct acpi_device *device)
522{
523 struct acpi_device_bus_id *acpi_device_bus_id;
524
525 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
526 if (!strcmp(acpi_device_bus_id->bus_id,
527 acpi_device_hid(device))) {
528 ida_free(&acpi_device_bus_id->instance_ida,
529 device->pnp.instance_no);
530 if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
531 list_del(&acpi_device_bus_id->node);
532 kfree_const(acpi_device_bus_id->bus_id);
533 kfree(acpi_device_bus_id);
534 }
535 break;
536 }
537
538 list_del(&device->wakeup_list);
539}
540
541static void acpi_device_del(struct acpi_device *device)
542{
543 mutex_lock(&acpi_device_lock);
544
545 acpi_device_cleanup(device);
546
547 mutex_unlock(&acpi_device_lock);
548
549 acpi_power_add_remove_device(device, false);
550 acpi_device_remove_files(device);
551 if (device->remove)
552 device->remove(device);
553
554 device_del(&device->dev);
555}
556
557static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
558
559static LIST_HEAD(acpi_device_del_list);
560static DEFINE_MUTEX(acpi_device_del_lock);
561
562static void acpi_device_del_work_fn(struct work_struct *work_not_used)
563{
564 for (;;) {
565 struct acpi_device *adev;
566
567 mutex_lock(&acpi_device_del_lock);
568
569 if (list_empty(&acpi_device_del_list)) {
570 mutex_unlock(&acpi_device_del_lock);
571 break;
572 }
573 adev = list_first_entry(&acpi_device_del_list,
574 struct acpi_device, del_list);
575 list_del(&adev->del_list);
576
577 mutex_unlock(&acpi_device_del_lock);
578
579 blocking_notifier_call_chain(&acpi_reconfig_chain,
580 ACPI_RECONFIG_DEVICE_REMOVE, adev);
581
582 acpi_device_del(adev);
583 /*
584 * Drop references to all power resources that might have been
585 * used by the device.
586 */
587 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
588 acpi_dev_put(adev);
589 }
590}
591
592/**
593 * acpi_scan_drop_device - Drop an ACPI device object.
594 * @handle: Handle of an ACPI namespace node, not used.
595 * @context: Address of the ACPI device object to drop.
596 *
597 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
598 * namespace node the device object pointed to by @context is attached to.
599 *
600 * The unregistration is carried out asynchronously to avoid running
601 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
602 * ensure the correct ordering (the device objects must be unregistered in the
603 * same order in which the corresponding namespace nodes are deleted).
604 */
605static void acpi_scan_drop_device(acpi_handle handle, void *context)
606{
607 static DECLARE_WORK(work, acpi_device_del_work_fn);
608 struct acpi_device *adev = context;
609
610 mutex_lock(&acpi_device_del_lock);
611
612 /*
613 * Use the ACPI hotplug workqueue which is ordered, so this work item
614 * won't run after any hotplug work items submitted subsequently. That
615 * prevents attempts to register device objects identical to those being
616 * deleted from happening concurrently (such attempts result from
617 * hotplug events handled via the ACPI hotplug workqueue). It also will
618 * run after all of the work items submitted previously, which helps
619 * those work items to ensure that they are not accessing stale device
620 * objects.
621 */
622 if (list_empty(&acpi_device_del_list))
623 acpi_queue_hotplug_work(&work);
624
625 list_add_tail(&adev->del_list, &acpi_device_del_list);
626 /* Make acpi_ns_validate_handle() return NULL for this handle. */
627 adev->handle = INVALID_ACPI_HANDLE;
628
629 mutex_unlock(&acpi_device_del_lock);
630}
631
632static struct acpi_device *handle_to_device(acpi_handle handle,
633 void (*callback)(void *))
634{
635 struct acpi_device *adev = NULL;
636 acpi_status status;
637
638 status = acpi_get_data_full(handle, acpi_scan_drop_device,
639 (void **)&adev, callback);
640 if (ACPI_FAILURE(status) || !adev) {
641 acpi_handle_debug(handle, "No context!\n");
642 return NULL;
643 }
644 return adev;
645}
646
647/**
648 * acpi_fetch_acpi_dev - Retrieve ACPI device object.
649 * @handle: ACPI handle associated with the requested ACPI device object.
650 *
651 * Return a pointer to the ACPI device object associated with @handle, if
652 * present, or NULL otherwise.
653 */
654struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)
655{
656 return handle_to_device(handle, NULL);
657}
658EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);
659
660static void get_acpi_device(void *dev)
661{
662 acpi_dev_get(dev);
663}
664
665/**
666 * acpi_get_acpi_dev - Retrieve ACPI device object and reference count it.
667 * @handle: ACPI handle associated with the requested ACPI device object.
668 *
669 * Return a pointer to the ACPI device object associated with @handle and bump
670 * up that object's reference counter (under the ACPI Namespace lock), if
671 * present, or return NULL otherwise.
672 *
673 * The ACPI device object reference acquired by this function needs to be
674 * dropped via acpi_dev_put().
675 */
676struct acpi_device *acpi_get_acpi_dev(acpi_handle handle)
677{
678 return handle_to_device(handle, get_acpi_device);
679}
680EXPORT_SYMBOL_GPL(acpi_get_acpi_dev);
681
682static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
683{
684 struct acpi_device_bus_id *acpi_device_bus_id;
685
686 /* Find suitable bus_id and instance number in acpi_bus_id_list. */
687 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
688 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
689 return acpi_device_bus_id;
690 }
691 return NULL;
692}
693
694static int acpi_device_set_name(struct acpi_device *device,
695 struct acpi_device_bus_id *acpi_device_bus_id)
696{
697 struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
698 int result;
699
700 result = ida_alloc(instance_ida, GFP_KERNEL);
701 if (result < 0)
702 return result;
703
704 device->pnp.instance_no = result;
705 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
706 return 0;
707}
708
709int acpi_tie_acpi_dev(struct acpi_device *adev)
710{
711 acpi_handle handle = adev->handle;
712 acpi_status status;
713
714 if (!handle)
715 return 0;
716
717 status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
718 if (ACPI_FAILURE(status)) {
719 acpi_handle_err(handle, "Unable to attach device data\n");
720 return -ENODEV;
721 }
722
723 return 0;
724}
725
726static void acpi_store_pld_crc(struct acpi_device *adev)
727{
728 struct acpi_pld_info *pld;
729
730 if (!acpi_get_physical_device_location(adev->handle, &pld))
731 return;
732
733 adev->pld_crc = crc32(~0, pld, sizeof(*pld));
734 ACPI_FREE(pld);
735}
736
737int acpi_device_add(struct acpi_device *device)
738{
739 struct acpi_device_bus_id *acpi_device_bus_id;
740 int result;
741
742 /*
743 * Linkage
744 * -------
745 * Link this device to its parent and siblings.
746 */
747 INIT_LIST_HEAD(&device->wakeup_list);
748 INIT_LIST_HEAD(&device->physical_node_list);
749 INIT_LIST_HEAD(&device->del_list);
750 mutex_init(&device->physical_node_lock);
751
752 mutex_lock(&acpi_device_lock);
753
754 acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
755 if (acpi_device_bus_id) {
756 result = acpi_device_set_name(device, acpi_device_bus_id);
757 if (result)
758 goto err_unlock;
759 } else {
760 acpi_device_bus_id = kzalloc_obj(*acpi_device_bus_id);
761 if (!acpi_device_bus_id) {
762 result = -ENOMEM;
763 goto err_unlock;
764 }
765 acpi_device_bus_id->bus_id =
766 kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
767 if (!acpi_device_bus_id->bus_id) {
768 kfree(acpi_device_bus_id);
769 result = -ENOMEM;
770 goto err_unlock;
771 }
772
773 ida_init(&acpi_device_bus_id->instance_ida);
774
775 result = acpi_device_set_name(device, acpi_device_bus_id);
776 if (result) {
777 kfree_const(acpi_device_bus_id->bus_id);
778 kfree(acpi_device_bus_id);
779 goto err_unlock;
780 }
781
782 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
783 }
784
785 if (device->wakeup.flags.valid)
786 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
787
788 acpi_store_pld_crc(device);
789
790 mutex_unlock(&acpi_device_lock);
791
792 result = device_add(&device->dev);
793 if (result) {
794 dev_err(&device->dev, "Error registering device\n");
795 goto err;
796 }
797
798 acpi_device_setup_files(device);
799
800 return 0;
801
802err:
803 mutex_lock(&acpi_device_lock);
804
805 acpi_device_cleanup(device);
806
807err_unlock:
808 mutex_unlock(&acpi_device_lock);
809
810 acpi_detach_data(device->handle, acpi_scan_drop_device);
811
812 return result;
813}
814
815/* --------------------------------------------------------------------------
816 Device Enumeration
817 -------------------------------------------------------------------------- */
818static bool acpi_info_matches_ids(struct acpi_device_info *info,
819 const char * const ids[])
820{
821 struct acpi_pnp_device_id_list *cid_list = NULL;
822 int i, index;
823
824 if (!(info->valid & ACPI_VALID_HID))
825 return false;
826
827 index = match_string(ids, -1, info->hardware_id.string);
828 if (index >= 0)
829 return true;
830
831 if (info->valid & ACPI_VALID_CID)
832 cid_list = &info->compatible_id_list;
833
834 if (!cid_list)
835 return false;
836
837 for (i = 0; i < cid_list->count; i++) {
838 index = match_string(ids, -1, cid_list->ids[i].string);
839 if (index >= 0)
840 return true;
841 }
842
843 return false;
844}
845
846/* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
847static const char * const acpi_ignore_dep_ids[] = {
848 "PNP0D80", /* Windows-compatible System Power Management Controller */
849 "INT33BD", /* Intel Baytrail Mailbox Device */
850 "LATT2021", /* Lattice FW Update Client Driver */
851 NULL
852};
853
854/* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */
855static const char * const acpi_honor_dep_ids[] = {
856 "ARMH0003", /* ARM GICv5 IWB */
857 "INT3472", /* Camera sensor PMIC / clk and regulator info */
858 "INTC1059", /* IVSC (TGL) driver must be loaded to allow i2c access to camera sensors */
859 "INTC1095", /* IVSC (ADL) driver must be loaded to allow i2c access to camera sensors */
860 "INTC100A", /* IVSC (RPL) driver must be loaded to allow i2c access to camera sensors */
861 "INTC10CF", /* IVSC (MTL) driver must be loaded to allow i2c access to camera sensors */
862 "INTC10DE", /* CVS (LNL) driver must be loaded to allow camera streaming */
863 "INTC10E0", /* CVS (ARL) driver must be loaded to allow camera streaming */
864 "INTC10E1", /* CVS (PTL) driver must be loaded to allow camera streaming */
865 "INTC10FA", /* CVS (NVL) driver must be loaded to allow camera streaming */
866 "RSCV0001", /* RISC-V PLIC */
867 "RSCV0002", /* RISC-V APLIC */
868 "RSCV0005", /* RISC-V SBI MPXY MBOX */
869 "RSCV0006", /* RISC-V RPMI SYSMSI */
870 "PNP0C0F", /* PCI Link Device */
871 "ACPI0016", /* CXL/PCIe host bridge: CXL root (ACPI0017) depends on PCI root attach */
872 NULL
873};
874
875static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle)
876{
877 struct acpi_device *adev;
878
879 /*
880 * Fixed hardware devices do not appear in the namespace and do not
881 * have handles, but we fabricate acpi_devices for them, so we have
882 * to deal with them specially.
883 */
884 if (!handle)
885 return acpi_root;
886
887 do {
888 acpi_status status;
889
890 status = acpi_get_parent(handle, &handle);
891 if (ACPI_FAILURE(status)) {
892 if (status != AE_NULL_ENTRY)
893 return acpi_root;
894
895 return NULL;
896 }
897 adev = acpi_fetch_acpi_dev(handle);
898 } while (!adev);
899 return adev;
900}
901
902acpi_status
903acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
904{
905 acpi_status status;
906 acpi_handle tmp;
907 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
908 union acpi_object *obj;
909
910 status = acpi_get_handle(handle, "_EJD", &tmp);
911 if (ACPI_FAILURE(status))
912 return status;
913
914 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
915 if (ACPI_SUCCESS(status)) {
916 obj = buffer.pointer;
917 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
918 ejd);
919 kfree(buffer.pointer);
920 }
921 return status;
922}
923EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
924
925static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
926{
927 acpi_handle handle = dev->handle;
928 struct acpi_device_wakeup *wakeup = &dev->wakeup;
929 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
930 union acpi_object *package = NULL;
931 union acpi_object *element = NULL;
932 acpi_status status;
933 int err = -ENODATA;
934
935 INIT_LIST_HEAD(&wakeup->resources);
936
937 /* _PRW */
938 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
939 if (ACPI_FAILURE(status)) {
940 acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
941 acpi_format_exception(status));
942 return err;
943 }
944
945 package = (union acpi_object *)buffer.pointer;
946
947 if (!package || package->package.count < 2)
948 goto out;
949
950 element = &(package->package.elements[0]);
951 if (!element)
952 goto out;
953
954 if (element->type == ACPI_TYPE_PACKAGE) {
955 if ((element->package.count < 2) ||
956 (element->package.elements[0].type !=
957 ACPI_TYPE_LOCAL_REFERENCE)
958 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
959 goto out;
960
961 wakeup->gpe_device =
962 element->package.elements[0].reference.handle;
963 wakeup->gpe_number =
964 (u32) element->package.elements[1].integer.value;
965 } else if (element->type == ACPI_TYPE_INTEGER) {
966 wakeup->gpe_device = NULL;
967 wakeup->gpe_number = element->integer.value;
968 } else {
969 goto out;
970 }
971
972 element = &(package->package.elements[1]);
973 if (element->type != ACPI_TYPE_INTEGER)
974 goto out;
975
976 wakeup->sleep_state = element->integer.value;
977
978 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
979 if (err)
980 goto out;
981
982 if (!list_empty(&wakeup->resources)) {
983 int sleep_state;
984
985 err = acpi_power_wakeup_list_init(&wakeup->resources,
986 &sleep_state);
987 if (err) {
988 acpi_handle_warn(handle, "Retrieving current states "
989 "of wakeup power resources failed\n");
990 acpi_power_resources_list_free(&wakeup->resources);
991 goto out;
992 }
993 if (sleep_state < wakeup->sleep_state) {
994 acpi_handle_warn(handle, "Overriding _PRW sleep state "
995 "(S%d) by S%d from power resources\n",
996 (int)wakeup->sleep_state, sleep_state);
997 wakeup->sleep_state = sleep_state;
998 }
999 }
1000
1001 out:
1002 kfree(buffer.pointer);
1003 return err;
1004}
1005
1006static bool acpi_wakeup_gpe_init(struct acpi_device *device)
1007{
1008 static const struct acpi_device_id button_device_ids[] = {
1009 {"PNP0C0D", 0}, /* Lid */
1010 {"PNP0C0E", 0}, /* Sleep button */
1011 {"", 0},
1012 };
1013 struct acpi_device_wakeup *wakeup = &device->wakeup;
1014 const struct acpi_device_id *match;
1015 acpi_status status;
1016
1017 wakeup->flags.notifier_present = 0;
1018
1019 match = acpi_match_acpi_device(button_device_ids, device);
1020 if (match && wakeup->sleep_state == ACPI_STATE_S5)
1021 wakeup->sleep_state = ACPI_STATE_S4;
1022
1023 status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1024 wakeup->gpe_number);
1025 return ACPI_SUCCESS(status);
1026}
1027
1028static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1029{
1030 int err;
1031
1032 /* Presence of _PRW indicates wake capable */
1033 if (!acpi_has_method(device->handle, "_PRW"))
1034 return;
1035
1036 err = acpi_bus_extract_wakeup_device_power_package(device);
1037 if (err) {
1038 dev_err(&device->dev, "Unable to extract wakeup power resources");
1039 return;
1040 }
1041
1042 device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
1043 device->wakeup.prepare_count = 0;
1044 /*
1045 * Call _PSW/_DSW object to disable its ability to wake the sleeping
1046 * system for the ACPI device with the _PRW object.
1047 * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
1048 * So it is necessary to call _DSW object first. Only when it is not
1049 * present will the _PSW object used.
1050 */
1051 err = acpi_device_sleep_wake(device, 0, 0, 0);
1052 if (err)
1053 pr_debug("error in _DSW or _PSW evaluation\n");
1054}
1055
1056static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1057{
1058 struct acpi_device_power_state *ps = &device->power.states[state];
1059 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1060 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1061 acpi_status status;
1062
1063 INIT_LIST_HEAD(&ps->resources);
1064
1065 /* Evaluate "_PRx" to get referenced power resources */
1066 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1067 if (ACPI_SUCCESS(status)) {
1068 union acpi_object *package = buffer.pointer;
1069
1070 if (buffer.length && package
1071 && package->type == ACPI_TYPE_PACKAGE
1072 && package->package.count)
1073 acpi_extract_power_resources(package, 0, &ps->resources);
1074
1075 ACPI_FREE(buffer.pointer);
1076 }
1077
1078 /* Evaluate "_PSx" to see if we can do explicit sets */
1079 pathname[2] = 'S';
1080 if (acpi_has_method(device->handle, pathname))
1081 ps->flags.explicit_set = 1;
1082
1083 /* State is valid if there are means to put the device into it. */
1084 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
1085 ps->flags.valid = 1;
1086
1087 ps->power = -1; /* Unknown - driver assigned */
1088 ps->latency = -1; /* Unknown - driver assigned */
1089}
1090
1091static void acpi_bus_get_power_flags(struct acpi_device *device)
1092{
1093 unsigned long long dsc = ACPI_STATE_D0;
1094 u32 i;
1095
1096 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1097 if (!acpi_has_method(device->handle, "_PS0") &&
1098 !acpi_has_method(device->handle, "_PR0"))
1099 return;
1100
1101 device->flags.power_manageable = 1;
1102
1103 /*
1104 * Power Management Flags
1105 */
1106 if (acpi_has_method(device->handle, "_PSC"))
1107 device->power.flags.explicit_get = 1;
1108
1109 if (acpi_has_method(device->handle, "_IRC"))
1110 device->power.flags.inrush_current = 1;
1111
1112 if (acpi_has_method(device->handle, "_DSW"))
1113 device->power.flags.dsw_present = 1;
1114
1115 acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc);
1116 device->power.state_for_enumeration = dsc;
1117
1118 /*
1119 * Enumerate supported power management states
1120 */
1121 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1122 acpi_bus_init_power_state(device, i);
1123
1124 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1125
1126 /* Set the defaults for D0 and D3hot (always supported). */
1127 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1128 device->power.states[ACPI_STATE_D0].power = 100;
1129 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1130
1131 /*
1132 * Use power resources only if the D0 list of them is populated, because
1133 * some platforms may provide _PR3 only to indicate D3cold support and
1134 * in those cases the power resources list returned by it may be bogus.
1135 */
1136 if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1137 device->power.flags.power_resources = 1;
1138 /*
1139 * D3cold is supported if the D3hot list of power resources is
1140 * not empty.
1141 */
1142 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1143 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1144 }
1145
1146 if (acpi_bus_init_power(device))
1147 device->flags.power_manageable = 0;
1148}
1149
1150static void acpi_bus_get_flags(struct acpi_device *device)
1151{
1152 /* Presence of _STA indicates 'dynamic_status' */
1153 if (acpi_has_method(device->handle, "_STA"))
1154 device->flags.dynamic_status = 1;
1155
1156 /* Presence of _RMV indicates 'removable' */
1157 if (acpi_has_method(device->handle, "_RMV"))
1158 device->flags.removable = 1;
1159
1160 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1161 if (acpi_has_method(device->handle, "_EJD") ||
1162 acpi_has_method(device->handle, "_EJ0"))
1163 device->flags.ejectable = 1;
1164}
1165
1166static void acpi_device_get_busid(struct acpi_device *device)
1167{
1168 char bus_id[5] = { '?', 0 };
1169 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1170 int i = 0;
1171
1172 /*
1173 * Bus ID
1174 * ------
1175 * The device's Bus ID is simply the object name.
1176 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1177 */
1178 if (!acpi_dev_parent(device)) {
1179 strscpy(device->pnp.bus_id, "ACPI");
1180 return;
1181 }
1182
1183 switch (device->device_type) {
1184 case ACPI_BUS_TYPE_POWER_BUTTON:
1185 strscpy(device->pnp.bus_id, "PWRF");
1186 break;
1187 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1188 strscpy(device->pnp.bus_id, "SLPF");
1189 break;
1190 case ACPI_BUS_TYPE_ECDT_EC:
1191 strscpy(device->pnp.bus_id, "ECDT");
1192 break;
1193 default:
1194 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1195 /* Clean up trailing underscores (if any) */
1196 for (i = 3; i > 1; i--) {
1197 if (bus_id[i] == '_')
1198 bus_id[i] = '\0';
1199 else
1200 break;
1201 }
1202 strscpy(device->pnp.bus_id, bus_id);
1203 break;
1204 }
1205}
1206
1207/*
1208 * acpi_ata_match - see if an acpi object is an ATA device
1209 *
1210 * If an acpi object has one of the ACPI ATA methods defined,
1211 * then we can safely call it an ATA device.
1212 */
1213bool acpi_ata_match(acpi_handle handle)
1214{
1215 return acpi_has_method(handle, "_GTF") ||
1216 acpi_has_method(handle, "_GTM") ||
1217 acpi_has_method(handle, "_STM") ||
1218 acpi_has_method(handle, "_SDD");
1219}
1220
1221/*
1222 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1223 *
1224 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1225 * then we can safely call it an ejectable drive bay
1226 */
1227bool acpi_bay_match(acpi_handle handle)
1228{
1229 acpi_handle phandle;
1230
1231 if (!acpi_has_method(handle, "_EJ0"))
1232 return false;
1233 if (acpi_ata_match(handle))
1234 return true;
1235 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1236 return false;
1237
1238 return acpi_ata_match(phandle);
1239}
1240
1241bool acpi_device_is_battery(struct acpi_device *adev)
1242{
1243 struct acpi_hardware_id *hwid;
1244
1245 list_for_each_entry(hwid, &adev->pnp.ids, list)
1246 if (!strcmp("PNP0C0A", hwid->id))
1247 return true;
1248
1249 return false;
1250}
1251
1252static bool is_ejectable_bay(struct acpi_device *adev)
1253{
1254 acpi_handle handle = adev->handle;
1255
1256 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1257 return true;
1258
1259 return acpi_bay_match(handle);
1260}
1261
1262/*
1263 * acpi_dock_match - see if an acpi object has a _DCK method
1264 */
1265bool acpi_dock_match(acpi_handle handle)
1266{
1267 return acpi_has_method(handle, "_DCK");
1268}
1269
1270static acpi_status
1271acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1272 void **return_value)
1273{
1274 long *cap = context;
1275
1276 if (acpi_has_method(handle, "_BCM") &&
1277 acpi_has_method(handle, "_BCL")) {
1278 acpi_handle_debug(handle, "Found generic backlight support\n");
1279 *cap |= ACPI_VIDEO_BACKLIGHT;
1280 /* We have backlight support, no need to scan further */
1281 return AE_CTRL_TERMINATE;
1282 }
1283 return 0;
1284}
1285
1286/* Returns true if the ACPI object is a video device which can be
1287 * handled by video.ko.
1288 * The device will get a Linux specific CID added in scan.c to
1289 * identify the device as an ACPI graphics device
1290 * Be aware that the graphics device may not be physically present
1291 */
1292long acpi_is_video_device(acpi_handle handle)
1293{
1294 long video_caps = 0;
1295
1296 /* Is this device able to support video switching ? */
1297 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1298 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1299
1300 /* Is this device able to retrieve a video ROM ? */
1301 if (acpi_has_method(handle, "_ROM"))
1302 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1303
1304 /* Is this device able to configure which video head to be POSTed ? */
1305 if (acpi_has_method(handle, "_VPO") &&
1306 acpi_has_method(handle, "_GPD") &&
1307 acpi_has_method(handle, "_SPD"))
1308 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1309
1310 /* Only check for backlight functionality if one of the above hit. */
1311 if (video_caps)
1312 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1313 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1314 &video_caps, NULL);
1315
1316 return video_caps;
1317}
1318EXPORT_SYMBOL(acpi_is_video_device);
1319
1320const char *acpi_device_hid(struct acpi_device *device)
1321{
1322 struct acpi_hardware_id *hid;
1323
1324 hid = list_first_entry_or_null(&device->pnp.ids, struct acpi_hardware_id, list);
1325 if (!hid)
1326 return dummy_hid;
1327
1328 return hid->id;
1329}
1330EXPORT_SYMBOL(acpi_device_hid);
1331
1332static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1333{
1334 struct acpi_hardware_id *id;
1335
1336 id = kmalloc_obj(*id);
1337 if (!id)
1338 return;
1339
1340 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1341 if (!id->id) {
1342 kfree(id);
1343 return;
1344 }
1345
1346 list_add_tail(&id->list, &pnp->ids);
1347 pnp->type.hardware_id = 1;
1348}
1349
1350/*
1351 * Old IBM workstations have a DSDT bug wherein the SMBus object
1352 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1353 * prefix. Work around this.
1354 */
1355static bool acpi_ibm_smbus_match(acpi_handle handle)
1356{
1357 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1358 struct acpi_buffer path = { sizeof(node_name), node_name };
1359
1360 if (!dmi_name_in_vendors("IBM"))
1361 return false;
1362
1363 /* Look for SMBS object */
1364 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1365 strcmp("SMBS", path.pointer))
1366 return false;
1367
1368 /* Does it have the necessary (but misnamed) methods? */
1369 if (acpi_has_method(handle, "SBI") &&
1370 acpi_has_method(handle, "SBR") &&
1371 acpi_has_method(handle, "SBW"))
1372 return true;
1373
1374 return false;
1375}
1376
1377static bool acpi_object_is_system_bus(acpi_handle handle)
1378{
1379 acpi_handle tmp;
1380
1381 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1382 tmp == handle)
1383 return true;
1384 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1385 tmp == handle)
1386 return true;
1387
1388 return false;
1389}
1390
1391static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1392 int device_type)
1393{
1394 struct acpi_device_info *info = NULL;
1395 struct acpi_pnp_device_id_list *cid_list;
1396 int i;
1397
1398 switch (device_type) {
1399 case ACPI_BUS_TYPE_DEVICE:
1400 if (handle == ACPI_ROOT_OBJECT) {
1401 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1402 break;
1403 }
1404
1405 acpi_get_object_info(handle, &info);
1406 if (!info) {
1407 pr_err("%s: Error reading device info\n", __func__);
1408 return;
1409 }
1410
1411 if (info->valid & ACPI_VALID_HID) {
1412 acpi_add_id(pnp, info->hardware_id.string);
1413 pnp->type.platform_id = 1;
1414 }
1415 if (info->valid & ACPI_VALID_CID) {
1416 cid_list = &info->compatible_id_list;
1417 for (i = 0; i < cid_list->count; i++)
1418 acpi_add_id(pnp, cid_list->ids[i].string);
1419 }
1420 if (info->valid & ACPI_VALID_ADR) {
1421 pnp->bus_address = info->address;
1422 pnp->type.bus_address = 1;
1423 }
1424 if (info->valid & ACPI_VALID_UID)
1425 pnp->unique_id = kstrdup(info->unique_id.string,
1426 GFP_KERNEL);
1427 if (info->valid & ACPI_VALID_CLS)
1428 acpi_add_id(pnp, info->class_code.string);
1429
1430 kfree(info);
1431
1432 /*
1433 * Some devices don't reliably have _HIDs & _CIDs, so add
1434 * synthetic HIDs to make sure drivers can find them.
1435 */
1436 if (acpi_is_video_device(handle)) {
1437 acpi_add_id(pnp, ACPI_VIDEO_HID);
1438 pnp->type.backlight = 1;
1439 break;
1440 }
1441 if (acpi_bay_match(handle))
1442 acpi_add_id(pnp, ACPI_BAY_HID);
1443 else if (acpi_dock_match(handle))
1444 acpi_add_id(pnp, ACPI_DOCK_HID);
1445 else if (acpi_ibm_smbus_match(handle))
1446 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1447 else if (list_empty(&pnp->ids) &&
1448 acpi_object_is_system_bus(handle)) {
1449 /* \_SB, \_TZ, LNXSYBUS */
1450 acpi_add_id(pnp, ACPI_BUS_HID);
1451 }
1452
1453 break;
1454 case ACPI_BUS_TYPE_POWER:
1455 acpi_add_id(pnp, ACPI_POWER_HID);
1456 break;
1457 case ACPI_BUS_TYPE_PROCESSOR:
1458 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1459 break;
1460 case ACPI_BUS_TYPE_THERMAL:
1461 acpi_add_id(pnp, ACPI_THERMAL_HID);
1462 pnp->type.platform_id = 1;
1463 break;
1464 case ACPI_BUS_TYPE_POWER_BUTTON:
1465 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1466 break;
1467 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1468 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1469 break;
1470 case ACPI_BUS_TYPE_ECDT_EC:
1471 acpi_add_id(pnp, ACPI_ECDT_HID);
1472 break;
1473 }
1474}
1475
1476void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1477{
1478 struct acpi_hardware_id *id, *tmp;
1479
1480 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1481 kfree_const(id->id);
1482 kfree(id);
1483 }
1484 kfree(pnp->unique_id);
1485}
1486
1487/**
1488 * acpi_dma_supported - Check DMA support for the specified device.
1489 * @adev: The pointer to acpi device
1490 *
1491 * Return false if DMA is not supported. Otherwise, return true
1492 */
1493bool acpi_dma_supported(const struct acpi_device *adev)
1494{
1495 if (!adev)
1496 return false;
1497
1498 if (adev->flags.cca_seen)
1499 return true;
1500
1501 /*
1502 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1503 * DMA on "Intel platforms". Presumably that includes all x86 and
1504 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1505 */
1506 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1507 return true;
1508
1509 return false;
1510}
1511
1512/**
1513 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1514 * @adev: The pointer to acpi device
1515 *
1516 * Return enum dev_dma_attr.
1517 */
1518enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1519{
1520 if (!acpi_dma_supported(adev))
1521 return DEV_DMA_NOT_SUPPORTED;
1522
1523 if (adev->flags.coherent_dma)
1524 return DEV_DMA_COHERENT;
1525 else
1526 return DEV_DMA_NON_COHERENT;
1527}
1528
1529/**
1530 * acpi_dma_get_range() - Get device DMA parameters.
1531 *
1532 * @dev: device to configure
1533 * @map: pointer to DMA ranges result
1534 *
1535 * Evaluate DMA regions and return pointer to DMA regions on
1536 * parsing success; it does not update the passed in values on failure.
1537 *
1538 * Return 0 on success, < 0 on failure.
1539 */
1540int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map)
1541{
1542 struct acpi_device *adev;
1543 LIST_HEAD(list);
1544 struct resource_entry *rentry;
1545 int ret;
1546 struct device *dma_dev = dev;
1547 struct bus_dma_region *r;
1548
1549 /*
1550 * Walk the device tree chasing an ACPI companion with a _DMA
1551 * object while we go. Stop if we find a device with an ACPI
1552 * companion containing a _DMA method.
1553 */
1554 do {
1555 adev = ACPI_COMPANION(dma_dev);
1556 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1557 break;
1558
1559 dma_dev = dma_dev->parent;
1560 } while (dma_dev);
1561
1562 if (!dma_dev)
1563 return -ENODEV;
1564
1565 if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1566 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1567 return -EINVAL;
1568 }
1569
1570 ret = acpi_dev_get_dma_resources(adev, &list);
1571 if (ret > 0) {
1572 r = kzalloc_objs(*r, ret + 1);
1573 if (!r) {
1574 ret = -ENOMEM;
1575 goto out;
1576 }
1577
1578 *map = r;
1579
1580 list_for_each_entry(rentry, &list, node) {
1581 if (rentry->res->start >= rentry->res->end) {
1582 kfree(*map);
1583 *map = NULL;
1584 ret = -EINVAL;
1585 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1586 goto out;
1587 }
1588
1589 r->cpu_start = rentry->res->start;
1590 r->dma_start = rentry->res->start - rentry->offset;
1591 r->size = resource_size(rentry->res);
1592 r++;
1593 }
1594 }
1595 out:
1596 acpi_dev_free_resource_list(&list);
1597
1598 return ret >= 0 ? 0 : ret;
1599}
1600
1601#ifdef CONFIG_IOMMU_API
1602int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1603 struct fwnode_handle *fwnode)
1604{
1605 int ret;
1606
1607 ret = iommu_fwspec_init(dev, fwnode);
1608 if (ret)
1609 return ret;
1610
1611 return iommu_fwspec_add_ids(dev, &id, 1);
1612}
1613
1614static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
1615{
1616 int err;
1617
1618 /* Serialise to make dev->iommu stable under our potential fwspec */
1619 mutex_lock(&iommu_probe_device_lock);
1620 /* If we already translated the fwspec there is nothing left to do */
1621 if (dev_iommu_fwspec_get(dev)) {
1622 mutex_unlock(&iommu_probe_device_lock);
1623 return 0;
1624 }
1625
1626 err = iort_iommu_configure_id(dev, id_in);
1627 if (err && err != -EPROBE_DEFER)
1628 err = rimt_iommu_configure_id(dev, id_in);
1629 if (err && err != -EPROBE_DEFER)
1630 err = viot_iommu_configure(dev);
1631
1632 mutex_unlock(&iommu_probe_device_lock);
1633
1634 return err;
1635}
1636
1637#else /* !CONFIG_IOMMU_API */
1638
1639int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1640 struct fwnode_handle *fwnode)
1641{
1642 return -ENODEV;
1643}
1644
1645static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
1646{
1647 return -ENODEV;
1648}
1649
1650#endif /* !CONFIG_IOMMU_API */
1651
1652/**
1653 * acpi_dma_configure_id - Set-up DMA configuration for the device.
1654 * @dev: The pointer to the device
1655 * @attr: device dma attributes
1656 * @input_id: input device id const value pointer
1657 */
1658int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1659 const u32 *input_id)
1660{
1661 int ret;
1662
1663 if (attr == DEV_DMA_NOT_SUPPORTED) {
1664 set_dma_ops(dev, &dma_dummy_ops);
1665 return 0;
1666 }
1667
1668 acpi_arch_dma_setup(dev);
1669
1670 /* Ignore all other errors apart from EPROBE_DEFER */
1671 ret = acpi_iommu_configure_id(dev, input_id);
1672 if (ret == -EPROBE_DEFER)
1673 return -EPROBE_DEFER;
1674 if (ret)
1675 dev_dbg(dev, "Adding to IOMMU failed: %d\n", ret);
1676
1677 arch_setup_dma_ops(dev, attr == DEV_DMA_COHERENT);
1678
1679 return 0;
1680}
1681EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1682
1683static void acpi_init_coherency(struct acpi_device *adev)
1684{
1685 unsigned long long cca = 0;
1686 acpi_status status;
1687 struct acpi_device *parent = acpi_dev_parent(adev);
1688
1689 if (parent && parent->flags.cca_seen) {
1690 /*
1691 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1692 * already saw one.
1693 */
1694 adev->flags.cca_seen = 1;
1695 cca = parent->flags.coherent_dma;
1696 } else {
1697 status = acpi_evaluate_integer(adev->handle, "_CCA",
1698 NULL, &cca);
1699 if (ACPI_SUCCESS(status))
1700 adev->flags.cca_seen = 1;
1701 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1702 /*
1703 * If architecture does not specify that _CCA is
1704 * required for DMA-able devices (e.g. x86),
1705 * we default to _CCA=1.
1706 */
1707 cca = 1;
1708 else
1709 acpi_handle_debug(adev->handle,
1710 "ACPI device is missing _CCA.\n");
1711 }
1712
1713 adev->flags.coherent_dma = cca;
1714}
1715
1716static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1717{
1718 bool *is_serial_bus_slave_p = data;
1719
1720 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1721 return 1;
1722
1723 *is_serial_bus_slave_p = true;
1724
1725 /* no need to do more checking */
1726 return -1;
1727}
1728
1729static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1730{
1731 struct acpi_device *parent = acpi_dev_parent(device);
1732 static const struct acpi_device_id indirect_io_hosts[] = {
1733 {"HISI0191", 0},
1734 {}
1735 };
1736
1737 return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1738}
1739
1740static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1741{
1742 struct list_head resource_list;
1743 bool is_serial_bus_slave = false;
1744 static const struct acpi_device_id ignore_serial_bus_ids[] = {
1745 /*
1746 * These devices have multiple SerialBus resources and a client
1747 * device must be instantiated for each of them, each with
1748 * its own device id.
1749 * Normally we only instantiate one client device for the first
1750 * resource, using the ACPI HID as id. These special cases are handled
1751 * by the drivers/platform/x86/serial-multi-instantiate.c driver, which
1752 * knows which client device id to use for each resource.
1753 */
1754 {"AWDZ8399", },
1755 {"BSG1160", },
1756 {"BSG2150", },
1757 {"CSC3551", },
1758 {"CSC3554", },
1759 {"CSC3556", },
1760 {"CSC3557", },
1761 {"INT33FE", },
1762 {"INT3515", },
1763 {"TXNW2781", },
1764 /* Non-conforming _HID for Cirrus Logic already released */
1765 {"CLSA0100", },
1766 {"CLSA0101", },
1767 /*
1768 * Some ACPI devs contain SerialBus resources even though they are not
1769 * attached to a serial bus at all.
1770 */
1771 {"MSHW0028", },
1772 /*
1773 * HIDs of device with an UartSerialBusV2 resource for which userspace
1774 * expects a regular tty cdev to be created (instead of the in kernel
1775 * serdev) and which have a kernel driver which expects a platform_dev
1776 * such as the rfkill-gpio driver.
1777 */
1778 {"BCM4752", },
1779 {"LNV4752", },
1780 {}
1781 };
1782
1783 if (acpi_is_indirect_io_slave(device))
1784 return true;
1785
1786 /* Macs use device properties in lieu of _CRS resources */
1787 if (x86_apple_machine &&
1788 (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1789 fwnode_property_present(&device->fwnode, "i2cAddress") ||
1790 fwnode_property_present(&device->fwnode, "baud")))
1791 return true;
1792
1793 if (acpi_dev_is_video_device(device))
1794 return false;
1795
1796 if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
1797 return false;
1798
1799 INIT_LIST_HEAD(&resource_list);
1800 acpi_dev_get_resources(device, &resource_list,
1801 acpi_check_serial_bus_slave,
1802 &is_serial_bus_slave);
1803 acpi_dev_free_resource_list(&resource_list);
1804
1805 return is_serial_bus_slave;
1806}
1807
1808void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1809 int type, void (*release)(struct device *))
1810{
1811 struct acpi_device *parent = acpi_find_parent_acpi_dev(handle);
1812
1813 INIT_LIST_HEAD(&device->pnp.ids);
1814 device->device_type = type;
1815 device->handle = handle;
1816 device->dev.parent = parent ? &parent->dev : NULL;
1817 device->dev.release = release;
1818 device->dev.bus = &acpi_bus_type;
1819 device->dev.groups = acpi_groups;
1820 device_set_pm_not_required(&device->dev);
1821 fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1822 acpi_set_device_status(device, ACPI_STA_DEFAULT);
1823 acpi_device_get_busid(device);
1824 acpi_set_pnp_ids(handle, &device->pnp, type);
1825 acpi_init_properties(device);
1826 acpi_bus_get_flags(device);
1827 device->flags.initialized = true;
1828 device->flags.enumeration_by_parent =
1829 acpi_device_enumeration_by_parent(device);
1830 acpi_device_clear_enumerated(device);
1831 device_initialize(&device->dev);
1832 dev_set_uevent_suppress(&device->dev, true);
1833 acpi_init_coherency(device);
1834}
1835
1836static void acpi_scan_dep_init(struct acpi_device *adev)
1837{
1838 struct acpi_dep_data *dep;
1839
1840 list_for_each_entry(dep, &acpi_dep_list, node) {
1841 if (dep->consumer == adev->handle) {
1842 if (dep->honor_dep)
1843 adev->flags.honor_deps = 1;
1844
1845 if (!dep->met)
1846 adev->dep_unmet++;
1847 }
1848 }
1849}
1850
1851void acpi_device_add_finalize(struct acpi_device *device)
1852{
1853 dev_set_uevent_suppress(&device->dev, false);
1854 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1855}
1856
1857static void acpi_scan_init_status(struct acpi_device *adev)
1858{
1859 if (acpi_bus_get_status(adev))
1860 acpi_set_device_status(adev, 0);
1861}
1862
1863static int acpi_add_single_object(struct acpi_device **child,
1864 acpi_handle handle, int type, bool dep_init)
1865{
1866 struct acpi_device *device;
1867 bool release_dep_lock = false;
1868 int result;
1869
1870 device = kzalloc_obj(struct acpi_device);
1871 if (!device)
1872 return -ENOMEM;
1873
1874 acpi_init_device_object(device, handle, type, acpi_device_release);
1875 /*
1876 * Getting the status is delayed till here so that we can call
1877 * acpi_bus_get_status() and use its quirk handling. Note that
1878 * this must be done before the get power-/wakeup_dev-flags calls.
1879 */
1880 if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
1881 if (dep_init) {
1882 mutex_lock(&acpi_dep_list_lock);
1883 /*
1884 * Hold the lock until the acpi_tie_acpi_dev() call
1885 * below to prevent concurrent acpi_scan_clear_dep()
1886 * from deleting a dependency list entry without
1887 * updating dep_unmet for the device.
1888 */
1889 release_dep_lock = true;
1890 acpi_scan_dep_init(device);
1891 }
1892 acpi_scan_init_status(device);
1893 }
1894
1895 acpi_bus_get_power_flags(device);
1896 acpi_bus_get_wakeup_device_flags(device);
1897
1898 result = acpi_tie_acpi_dev(device);
1899
1900 if (release_dep_lock)
1901 mutex_unlock(&acpi_dep_list_lock);
1902
1903 if (!result)
1904 result = acpi_device_add(device);
1905
1906 if (result) {
1907 acpi_dev_put(device);
1908 return result;
1909 }
1910
1911 acpi_power_add_remove_device(device, true);
1912 acpi_device_add_finalize(device);
1913
1914 acpi_handle_debug(handle, "Added as %s, parent %s\n",
1915 dev_name(&device->dev), device->dev.parent ?
1916 dev_name(device->dev.parent) : "(null)");
1917
1918 *child = device;
1919 return 0;
1920}
1921
1922static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1923 void *context)
1924{
1925 struct resource *res = context;
1926
1927 if (acpi_dev_resource_memory(ares, res))
1928 return AE_CTRL_TERMINATE;
1929
1930 return AE_OK;
1931}
1932
1933static bool acpi_device_should_be_hidden(acpi_handle handle)
1934{
1935 acpi_status status;
1936 struct resource res;
1937
1938 /* Check if it should ignore the UART device */
1939 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1940 return false;
1941
1942 /*
1943 * The UART device described in SPCR table is assumed to have only one
1944 * memory resource present. So we only look for the first one here.
1945 */
1946 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1947 acpi_get_resource_memory, &res);
1948 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1949 return false;
1950
1951 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1952 &res.start);
1953
1954 return true;
1955}
1956
1957bool acpi_device_is_present(const struct acpi_device *adev)
1958{
1959 return adev->status.present || adev->status.functional;
1960}
1961
1962bool acpi_device_is_enabled(const struct acpi_device *adev)
1963{
1964 return adev->status.enabled;
1965}
1966
1967static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1968 const char *idstr,
1969 const struct acpi_device_id **matchid)
1970{
1971 const struct acpi_device_id *devid;
1972
1973 if (handler->match)
1974 return handler->match(idstr, matchid);
1975
1976 for (devid = handler->ids; devid->id[0]; devid++)
1977 if (!strcmp((char *)devid->id, idstr)) {
1978 if (matchid)
1979 *matchid = devid;
1980
1981 return true;
1982 }
1983
1984 return false;
1985}
1986
1987static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1988 const struct acpi_device_id **matchid)
1989{
1990 struct acpi_scan_handler *handler;
1991
1992 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1993 if (acpi_scan_handler_matching(handler, idstr, matchid))
1994 return handler;
1995
1996 return NULL;
1997}
1998
1999void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2000{
2001 if (!!hotplug->enabled == !!val)
2002 return;
2003
2004 mutex_lock(&acpi_scan_lock);
2005
2006 hotplug->enabled = val;
2007
2008 mutex_unlock(&acpi_scan_lock);
2009}
2010
2011int acpi_scan_add_dep(acpi_handle handle, struct acpi_handle_list *dep_devices)
2012{
2013 u32 count;
2014 int i;
2015
2016 for (count = 0, i = 0; i < dep_devices->count; i++) {
2017 struct acpi_device_info *info;
2018 struct acpi_dep_data *dep;
2019 bool skip, honor_dep;
2020 acpi_status status;
2021
2022 status = acpi_get_object_info(dep_devices->handles[i], &info);
2023 if (ACPI_FAILURE(status)) {
2024 acpi_handle_debug(handle, "Error reading _DEP device info\n");
2025 continue;
2026 }
2027
2028 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
2029 honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids);
2030 kfree(info);
2031
2032 if (skip)
2033 continue;
2034
2035 dep = kzalloc_obj(*dep);
2036 if (!dep)
2037 continue;
2038
2039 count++;
2040
2041 dep->supplier = dep_devices->handles[i];
2042 dep->consumer = handle;
2043 dep->honor_dep = honor_dep;
2044
2045 mutex_lock(&acpi_dep_list_lock);
2046 list_add_tail(&dep->node, &acpi_dep_list);
2047 mutex_unlock(&acpi_dep_list_lock);
2048 }
2049
2050 acpi_handle_list_free(dep_devices);
2051 return count;
2052}
2053
2054static void acpi_scan_init_hotplug(struct acpi_device *adev)
2055{
2056 struct acpi_hardware_id *hwid;
2057
2058 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2059 acpi_dock_add(adev);
2060 return;
2061 }
2062 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2063 struct acpi_scan_handler *handler;
2064
2065 handler = acpi_scan_match_handler(hwid->id, NULL);
2066 if (handler) {
2067 adev->flags.hotplug_notify = true;
2068 break;
2069 }
2070 }
2071}
2072
2073u32 __weak arch_acpi_add_auto_dep(acpi_handle handle) { return 0; }
2074
2075static u32 acpi_scan_check_dep(acpi_handle handle)
2076{
2077 struct acpi_handle_list dep_devices;
2078 u32 count = 0;
2079
2080 /*
2081 * Some architectures like RISC-V need to add dependencies for
2082 * all devices which use GSI to the interrupt controller so that
2083 * interrupt controller is probed before any of those devices.
2084 * Instead of mandating _DEP on all the devices, detect the
2085 * dependency and add automatically.
2086 */
2087 count += arch_acpi_add_auto_dep(handle);
2088
2089 /*
2090 * Check for _HID here to avoid deferring the enumeration of:
2091 * 1. PCI devices.
2092 * 2. ACPI nodes describing USB ports.
2093 * Still, checking for _HID catches more then just these cases ...
2094 */
2095 if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID"))
2096 return count;
2097
2098 if (!acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices)) {
2099 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
2100 return count;
2101 }
2102
2103 count += acpi_scan_add_dep(handle, &dep_devices);
2104 return count;
2105}
2106
2107static acpi_status acpi_scan_check_crs_csi2_cb(acpi_handle handle, u32 a, void *b, void **c)
2108{
2109 acpi_mipi_check_crs_csi2(handle);
2110 return AE_OK;
2111}
2112
2113static acpi_status acpi_bus_check_add(acpi_handle handle, bool first_pass,
2114 struct acpi_device **adev_p)
2115{
2116 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
2117 acpi_object_type acpi_type;
2118 int type;
2119
2120 if (device)
2121 goto out;
2122
2123 if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
2124 return AE_OK;
2125
2126 switch (acpi_type) {
2127 case ACPI_TYPE_DEVICE:
2128 if (acpi_device_should_be_hidden(handle))
2129 return AE_OK;
2130
2131 if (first_pass) {
2132 acpi_mipi_check_crs_csi2(handle);
2133
2134 /* Bail out if there are dependencies. */
2135 if (acpi_scan_check_dep(handle) > 0) {
2136 /*
2137 * The entire CSI-2 connection graph needs to be
2138 * extracted before any drivers or scan handlers
2139 * are bound to struct device objects, so scan
2140 * _CRS CSI-2 resource descriptors for all
2141 * devices below the current handle.
2142 */
2143 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
2144 ACPI_UINT32_MAX,
2145 acpi_scan_check_crs_csi2_cb,
2146 NULL, NULL, NULL);
2147 return AE_CTRL_DEPTH;
2148 }
2149 }
2150
2151 fallthrough;
2152 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
2153 type = ACPI_BUS_TYPE_DEVICE;
2154 break;
2155
2156 case ACPI_TYPE_PROCESSOR:
2157 type = ACPI_BUS_TYPE_PROCESSOR;
2158 break;
2159
2160 case ACPI_TYPE_THERMAL:
2161 type = ACPI_BUS_TYPE_THERMAL;
2162 break;
2163
2164 case ACPI_TYPE_POWER:
2165 acpi_add_power_resource(handle);
2166 fallthrough;
2167 default:
2168 return AE_OK;
2169 }
2170
2171 /*
2172 * If first_pass is true at this point, the device has no dependencies,
2173 * or the creation of the device object would have been postponed above.
2174 */
2175 acpi_add_single_object(&device, handle, type, !first_pass);
2176 if (!device)
2177 return AE_CTRL_DEPTH;
2178
2179 acpi_scan_init_hotplug(device);
2180
2181out:
2182 if (!*adev_p)
2183 *adev_p = device;
2184
2185 return AE_OK;
2186}
2187
2188static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
2189 void *not_used, void **ret_p)
2190{
2191 return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
2192}
2193
2194static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
2195 void *not_used, void **ret_p)
2196{
2197 return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
2198}
2199
2200static void acpi_video_bus_device_release(struct device *dev)
2201{
2202 struct auxiliary_device *aux_dev = to_auxiliary_dev(dev);
2203
2204 kfree(aux_dev);
2205}
2206
2207static void acpi_create_video_bus_device(struct acpi_device *adev,
2208 struct acpi_device *parent)
2209{
2210 struct auxiliary_device *aux_dev;
2211 static unsigned int aux_dev_id;
2212
2213 struct device *phys_parent __free(put_device) = acpi_bus_get_primary_device(parent);
2214 if (!phys_parent)
2215 return;
2216
2217 aux_dev = kzalloc_obj(*aux_dev);
2218 if (!aux_dev)
2219 return;
2220
2221 aux_dev->id = aux_dev_id++;
2222 aux_dev->name = "video_bus";
2223 aux_dev->dev.parent = phys_parent;
2224 aux_dev->dev.release = acpi_video_bus_device_release;
2225
2226 if (auxiliary_device_init(aux_dev)) {
2227 kfree(aux_dev);
2228 return;
2229 }
2230
2231 ACPI_COMPANION_SET(&aux_dev->dev, adev);
2232 if (__auxiliary_device_add(aux_dev, "acpi"))
2233 auxiliary_device_uninit(aux_dev);
2234}
2235
2236struct acpi_scan_system_dev {
2237 struct list_head node;
2238 struct acpi_device *adev;
2239};
2240
2241static const char * const acpi_system_dev_ids[] = {
2242 "PNP0C01", /* Memory controller */
2243 "PNP0C02", /* Motherboard resource */
2244 NULL
2245};
2246
2247static void acpi_default_enumeration(struct acpi_device *device)
2248{
2249 /*
2250 * Do not enumerate devices with enumeration_by_parent flag set as
2251 * they will be enumerated by their respective parents.
2252 */
2253 if (device->flags.enumeration_by_parent) {
2254 blocking_notifier_call_chain(&acpi_reconfig_chain,
2255 ACPI_RECONFIG_DEVICE_ADD, device);
2256 return;
2257 }
2258 if (match_string(acpi_system_dev_ids, -1, acpi_device_hid(device)) >= 0) {
2259 struct acpi_scan_system_dev *sd;
2260
2261 /*
2262 * This is a generic system device, so there is no need to
2263 * create a platform device for it, but its resources need to be
2264 * reserved. However, that needs to be done after all of the
2265 * other device objects have been processed and PCI has claimed
2266 * BARs in case there are resource conflicts.
2267 */
2268 sd = kmalloc_obj(*sd);
2269 if (sd) {
2270 sd->adev = device;
2271 list_add_tail(&sd->node, &acpi_scan_system_dev_list);
2272 }
2273 } else if (device->pnp.type.backlight) {
2274 struct acpi_device *parent;
2275
2276 parent = acpi_dev_parent(device);
2277 if (parent)
2278 acpi_create_video_bus_device(device, parent);
2279 } else {
2280 /* For a regular device object, create a platform device. */
2281 acpi_create_platform_device(device, NULL);
2282 }
2283 acpi_device_set_enumerated(device);
2284}
2285
2286static const struct acpi_device_id generic_device_ids[] = {
2287 {ACPI_DT_NAMESPACE_HID, },
2288 {"", },
2289};
2290
2291static int acpi_generic_device_attach(struct acpi_device *adev,
2292 const struct acpi_device_id *not_used)
2293{
2294 /*
2295 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2296 * below can be unconditional.
2297 */
2298 if (adev->data.of_compatible)
2299 acpi_default_enumeration(adev);
2300
2301 return 1;
2302}
2303
2304static struct acpi_scan_handler generic_device_handler = {
2305 .ids = generic_device_ids,
2306 .attach = acpi_generic_device_attach,
2307};
2308
2309static int acpi_scan_attach_handler(struct acpi_device *device)
2310{
2311 struct acpi_hardware_id *hwid;
2312 int ret = 0;
2313
2314 list_for_each_entry(hwid, &device->pnp.ids, list) {
2315 const struct acpi_device_id *devid;
2316 struct acpi_scan_handler *handler;
2317
2318 handler = acpi_scan_match_handler(hwid->id, &devid);
2319 if (handler) {
2320 if (!handler->attach) {
2321 device->pnp.type.platform_id = 0;
2322 continue;
2323 }
2324 device->handler = handler;
2325 ret = handler->attach(device, devid);
2326 if (ret > 0)
2327 break;
2328
2329 device->handler = NULL;
2330 if (ret < 0)
2331 break;
2332 }
2333 }
2334
2335 return ret;
2336}
2337
2338static int acpi_bus_attach(struct acpi_device *device, void *first_pass)
2339{
2340 bool skip = !first_pass && device->flags.visited;
2341 acpi_handle ejd;
2342 int ret;
2343
2344 if (skip)
2345 goto ok;
2346
2347 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2348 register_dock_dependent_device(device, ejd);
2349
2350 acpi_bus_get_status(device);
2351 /* Skip devices that are not ready for enumeration (e.g. not present) */
2352 if (!acpi_dev_ready_for_enumeration(device)) {
2353 device->flags.initialized = false;
2354 acpi_device_clear_enumerated(device);
2355 device->flags.power_manageable = 0;
2356 return 0;
2357 }
2358 if (device->handler)
2359 goto ok;
2360
2361 acpi_ec_register_opregions(device);
2362
2363 if (!device->flags.initialized) {
2364 device->flags.power_manageable =
2365 device->power.states[ACPI_STATE_D0].flags.valid;
2366 if (acpi_bus_init_power(device))
2367 device->flags.power_manageable = 0;
2368
2369 device->flags.initialized = true;
2370 } else if (device->flags.visited) {
2371 goto ok;
2372 }
2373
2374 ret = acpi_scan_attach_handler(device);
2375 if (ret < 0)
2376 return 0;
2377
2378 if (ret > 0 && !device->flags.enumeration_by_parent) {
2379 acpi_device_set_enumerated(device);
2380 goto ok;
2381 }
2382
2383 if (device->pnp.type.platform_id || device->pnp.type.backlight ||
2384 device->flags.enumeration_by_parent)
2385 acpi_default_enumeration(device);
2386 else
2387 acpi_device_set_enumerated(device);
2388
2389ok:
2390 acpi_dev_for_each_child(device, acpi_bus_attach, first_pass);
2391
2392 if (!skip && device->handler && device->handler->hotplug.notify_online)
2393 device->handler->hotplug.notify_online(device);
2394
2395 return 0;
2396}
2397
2398static int acpi_dev_get_next_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
2399{
2400 struct acpi_device **adev_p = data;
2401 struct acpi_device *adev = *adev_p;
2402
2403 /*
2404 * If we're passed a 'previous' consumer device then we need to skip
2405 * any consumers until we meet the previous one, and then NULL @data
2406 * so the next one can be returned.
2407 */
2408 if (adev) {
2409 if (dep->consumer == adev->handle)
2410 *adev_p = NULL;
2411
2412 return 0;
2413 }
2414
2415 adev = acpi_get_acpi_dev(dep->consumer);
2416 if (adev) {
2417 *(struct acpi_device **)data = adev;
2418 return 1;
2419 }
2420 /* Continue parsing if the device object is not present. */
2421 return 0;
2422}
2423
2424static void acpi_scan_clear_dep_fn(void *dev, async_cookie_t cookie)
2425{
2426 struct acpi_device *adev = to_acpi_device(dev);
2427
2428 acpi_scan_lock_acquire();
2429 acpi_bus_attach(adev, (void *)true);
2430 acpi_scan_lock_release();
2431
2432 acpi_dev_put(adev);
2433}
2434
2435static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
2436{
2437 if (adev->dep_unmet)
2438 return false;
2439
2440 /*
2441 * Async schedule the deferred acpi_scan_clear_dep_fn() since:
2442 * - acpi_bus_attach() needs to hold acpi_scan_lock which cannot
2443 * be acquired under acpi_dep_list_lock (held here)
2444 * - the deferred work at boot stage is ensured to be finished
2445 * before userspace init task by the async_synchronize_full()
2446 * barrier
2447 *
2448 * Use _nocall variant since it'll return on failure instead of
2449 * run the function synchronously.
2450 */
2451 return async_schedule_dev_nocall(acpi_scan_clear_dep_fn, &adev->dev);
2452}
2453
2454static void acpi_scan_delete_dep_data(struct acpi_dep_data *dep)
2455{
2456 list_del(&dep->node);
2457 kfree(dep);
2458}
2459
2460static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
2461{
2462 struct acpi_device *adev = acpi_get_acpi_dev(dep->consumer);
2463
2464 if (adev) {
2465 adev->dep_unmet--;
2466 if (!acpi_scan_clear_dep_queue(adev))
2467 acpi_dev_put(adev);
2468 }
2469
2470 if (dep->free_when_met)
2471 acpi_scan_delete_dep_data(dep);
2472 else
2473 dep->met = true;
2474
2475 return 0;
2476}
2477
2478/**
2479 * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list
2480 * @handle: The ACPI handle of the supplier device
2481 * @callback: Pointer to the callback function to apply
2482 * @data: Pointer to some data to pass to the callback
2483 *
2484 * The return value of the callback determines this function's behaviour. If 0
2485 * is returned we continue to iterate over acpi_dep_list. If a positive value
2486 * is returned then the loop is broken but this function returns 0. If a
2487 * negative value is returned by the callback then the loop is broken and that
2488 * value is returned as the final error.
2489 */
2490static int acpi_walk_dep_device_list(acpi_handle handle,
2491 int (*callback)(struct acpi_dep_data *, void *),
2492 void *data)
2493{
2494 struct acpi_dep_data *dep, *tmp;
2495 int ret = 0;
2496
2497 mutex_lock(&acpi_dep_list_lock);
2498 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2499 if (dep->supplier == handle) {
2500 ret = callback(dep, data);
2501 if (ret)
2502 break;
2503 }
2504 }
2505 mutex_unlock(&acpi_dep_list_lock);
2506
2507 return ret > 0 ? 0 : ret;
2508}
2509
2510/**
2511 * acpi_dev_clear_dependencies - Inform consumers that the device is now active
2512 * @supplier: Pointer to the supplier &struct acpi_device
2513 *
2514 * Clear dependencies on the given device.
2515 */
2516void acpi_dev_clear_dependencies(struct acpi_device *supplier)
2517{
2518 acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
2519}
2520EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
2521
2522/**
2523 * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration
2524 * @device: Pointer to the &struct acpi_device to check
2525 *
2526 * Check if the device is present and has no unmet dependencies.
2527 *
2528 * Return true if the device is ready for enumeratino. Otherwise, return false.
2529 */
2530bool acpi_dev_ready_for_enumeration(const struct acpi_device *device)
2531{
2532 if (device->flags.honor_deps && device->dep_unmet)
2533 return false;
2534
2535 return acpi_device_is_present(device);
2536}
2537EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);
2538
2539/**
2540 * acpi_dev_get_next_consumer_dev - Return the next adev dependent on @supplier
2541 * @supplier: Pointer to the dependee device
2542 * @start: Pointer to the current dependent device
2543 *
2544 * Returns the next &struct acpi_device which declares itself dependent on
2545 * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
2546 *
2547 * If the returned adev is not passed as @start to this function, the caller is
2548 * responsible for putting the reference to adev when it is no longer needed.
2549 */
2550struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier,
2551 struct acpi_device *start)
2552{
2553 struct acpi_device *adev = start;
2554
2555 acpi_walk_dep_device_list(supplier->handle,
2556 acpi_dev_get_next_consumer_dev_cb, &adev);
2557
2558 acpi_dev_put(start);
2559
2560 if (adev == start)
2561 return NULL;
2562
2563 return adev;
2564}
2565EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev);
2566
2567static void acpi_scan_postponed_branch(acpi_handle handle)
2568{
2569 struct acpi_device *adev = NULL;
2570
2571 if (ACPI_FAILURE(acpi_bus_check_add(handle, false, &adev)))
2572 return;
2573
2574 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2575 acpi_bus_check_add_2, NULL, NULL, (void **)&adev);
2576
2577 /*
2578 * Populate the ACPI _CRS CSI-2 software nodes for the ACPI devices that
2579 * have been added above.
2580 */
2581 acpi_mipi_init_crs_csi2_swnodes();
2582
2583 acpi_bus_attach(adev, NULL);
2584}
2585
2586static void acpi_scan_postponed(void)
2587{
2588 struct acpi_dep_data *dep, *tmp;
2589
2590 mutex_lock(&acpi_dep_list_lock);
2591
2592 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2593 acpi_handle handle = dep->consumer;
2594
2595 /*
2596 * In case there are multiple acpi_dep_list entries with the
2597 * same consumer, skip the current entry if the consumer device
2598 * object corresponding to it is present already.
2599 */
2600 if (!acpi_fetch_acpi_dev(handle)) {
2601 /*
2602 * Even though the lock is released here, tmp is
2603 * guaranteed to be valid, because none of the list
2604 * entries following dep is marked as "free when met"
2605 * and so they cannot be deleted.
2606 */
2607 mutex_unlock(&acpi_dep_list_lock);
2608
2609 acpi_scan_postponed_branch(handle);
2610
2611 mutex_lock(&acpi_dep_list_lock);
2612 }
2613
2614 if (dep->met)
2615 acpi_scan_delete_dep_data(dep);
2616 else
2617 dep->free_when_met = true;
2618 }
2619
2620 mutex_unlock(&acpi_dep_list_lock);
2621}
2622
2623static void acpi_scan_claim_resources(struct acpi_device *adev)
2624{
2625 struct resource_entry *rentry;
2626 LIST_HEAD(resource_list);
2627 unsigned int count = 0;
2628 const char *regionid;
2629
2630 if (acpi_dev_get_resources(adev, &resource_list, NULL, NULL) <= 0)
2631 return;
2632
2633 regionid = kstrdup(dev_name(&adev->dev), GFP_KERNEL);
2634 if (!regionid)
2635 goto exit;
2636
2637 list_for_each_entry(rentry, &resource_list, node) {
2638 struct resource *res = rentry->res;
2639 struct resource *r;
2640
2641 /* Skip disabled and invalid resources. */
2642 if ((res->flags & IORESOURCE_DISABLED) || res->end < res->start)
2643 continue;
2644
2645 if (resource_type(res) == IORESOURCE_IO) {
2646 /*
2647 * Follow the PNP system driver and on x86 skip I/O
2648 * resources that start below 0x100 (the "standard PC
2649 * hardware" boundary).
2650 */
2651 if (IS_ENABLED(CONFIG_X86) && res->start < 0x100) {
2652 dev_info(&adev->dev, "Skipped %pR\n", res);
2653 continue;
2654 }
2655 r = request_region(res->start, resource_size(res), regionid);
2656 } else if (resource_type(res) == IORESOURCE_MEM) {
2657 r = request_mem_region(res->start, resource_size(res), regionid);
2658 } else {
2659 continue;
2660 }
2661
2662 if (r) {
2663 r->flags &= ~IORESOURCE_BUSY;
2664 dev_info(&adev->dev, "Reserved %pR\n", r);
2665 count++;
2666 } else {
2667 /*
2668 * Failures at this point are usually harmless. PCI
2669 * quirks, for example, reserve resources they know
2670 * about too, so there may well be double reservations.
2671 */
2672 dev_info(&adev->dev, "Could not reserve %pR\n", res);
2673 }
2674 }
2675
2676 if (!count)
2677 kfree(regionid);
2678
2679exit:
2680 acpi_dev_free_resource_list(&resource_list);
2681}
2682
2683static int __init acpi_reserve_motherboard_resources(void)
2684{
2685 struct acpi_scan_system_dev *sd, *tmp;
2686
2687 guard(mutex)(&acpi_scan_lock);
2688
2689 list_for_each_entry_safe(sd, tmp, &acpi_scan_system_dev_list, node) {
2690 acpi_scan_claim_resources(sd->adev);
2691 list_del(&sd->node);
2692 kfree(sd);
2693 }
2694
2695 return 0;
2696}
2697
2698/*
2699 * Reserve motherboard resources after PCI claims BARs, but before PCI assigns
2700 * resources for uninitialized PCI devices.
2701 */
2702fs_initcall(acpi_reserve_motherboard_resources);
2703
2704/**
2705 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2706 * @handle: Root of the namespace scope to scan.
2707 *
2708 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2709 * found devices.
2710 *
2711 * If no devices were found, -ENODEV is returned, but it does not mean that
2712 * there has been a real error. There just have been no suitable ACPI objects
2713 * in the table trunk from which the kernel could create a device and add an
2714 * appropriate driver.
2715 *
2716 * Must be called under acpi_scan_lock.
2717 */
2718int acpi_bus_scan(acpi_handle handle)
2719{
2720 struct acpi_device *device = NULL;
2721
2722 /* Pass 1: Avoid enumerating devices with missing dependencies. */
2723
2724 if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2725 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2726 acpi_bus_check_add_1, NULL, NULL,
2727 (void **)&device);
2728
2729 if (!device)
2730 return -ENODEV;
2731
2732 /*
2733 * Set up ACPI _CRS CSI-2 software nodes using information extracted
2734 * from the _CRS CSI-2 resource descriptors during the ACPI namespace
2735 * walk above and MIPI DisCo for Imaging device properties.
2736 */
2737 acpi_mipi_scan_crs_csi2();
2738 acpi_mipi_init_crs_csi2_swnodes();
2739
2740 acpi_bus_attach(device, (void *)true);
2741
2742 /* Pass 2: Enumerate all of the remaining devices. */
2743
2744 acpi_scan_postponed();
2745
2746 acpi_mipi_crs_csi2_cleanup();
2747
2748 return 0;
2749}
2750EXPORT_SYMBOL(acpi_bus_scan);
2751
2752/**
2753 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2754 * @adev: Root of the ACPI namespace scope to walk.
2755 *
2756 * Must be called under acpi_scan_lock.
2757 */
2758void acpi_bus_trim(struct acpi_device *adev)
2759{
2760 uintptr_t flags = 0;
2761
2762 acpi_scan_check_and_detach(adev, (void *)flags);
2763}
2764EXPORT_SYMBOL_GPL(acpi_bus_trim);
2765
2766int acpi_bus_register_early_device(int type)
2767{
2768 struct acpi_device *device = NULL;
2769 int result;
2770
2771 result = acpi_add_single_object(&device, NULL, type, false);
2772 if (result)
2773 return result;
2774
2775 acpi_default_enumeration(device);
2776 return 0;
2777}
2778EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2779
2780static void acpi_bus_add_fixed_device_object(enum acpi_bus_device_type type)
2781{
2782 struct acpi_device *adev = NULL;
2783
2784 acpi_add_single_object(&adev, NULL, type, false);
2785 if (adev)
2786 acpi_default_enumeration(adev);
2787}
2788
2789static void acpi_bus_scan_fixed(void)
2790{
2791 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON))
2792 acpi_bus_add_fixed_device_object(ACPI_BUS_TYPE_POWER_BUTTON);
2793
2794 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON))
2795 acpi_bus_add_fixed_device_object(ACPI_BUS_TYPE_SLEEP_BUTTON);
2796}
2797
2798static void __init acpi_get_spcr_uart_addr(void)
2799{
2800 acpi_status status;
2801 struct acpi_table_spcr *spcr_ptr;
2802
2803 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2804 (struct acpi_table_header **)&spcr_ptr);
2805 if (ACPI_FAILURE(status)) {
2806 pr_warn("STAO table present, but SPCR is missing\n");
2807 return;
2808 }
2809
2810 spcr_uart_addr = spcr_ptr->serial_port.address;
2811 acpi_put_table((struct acpi_table_header *)spcr_ptr);
2812}
2813
2814static bool acpi_scan_initialized;
2815
2816void __init acpi_scan_init(void)
2817{
2818 acpi_status status;
2819 struct acpi_table_stao *stao_ptr;
2820
2821 acpi_pci_root_init();
2822 acpi_pci_link_init();
2823 acpi_processor_init();
2824 acpi_platform_init();
2825 acpi_lpss_init();
2826 acpi_apd_init();
2827 acpi_cmos_rtc_init();
2828 acpi_container_init();
2829 acpi_memory_hotplug_init();
2830 acpi_watchdog_init();
2831 acpi_pnp_init();
2832 acpi_power_resources_init();
2833 acpi_init_lpit();
2834
2835 acpi_scan_add_handler(&generic_device_handler);
2836
2837 /*
2838 * If there is STAO table, check whether it needs to ignore the UART
2839 * device in SPCR table.
2840 */
2841 status = acpi_get_table(ACPI_SIG_STAO, 0,
2842 (struct acpi_table_header **)&stao_ptr);
2843 if (ACPI_SUCCESS(status)) {
2844 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2845 pr_info("STAO Name List not yet supported.\n");
2846
2847 if (stao_ptr->ignore_uart)
2848 acpi_get_spcr_uart_addr();
2849
2850 acpi_put_table((struct acpi_table_header *)stao_ptr);
2851 }
2852
2853 acpi_gpe_apply_masked_gpes();
2854 acpi_update_all_gpes();
2855
2856 /*
2857 * Although we call __add_memory() that is documented to require the
2858 * device_hotplug_lock, it is not necessary here because this is an
2859 * early code when userspace or any other code path cannot trigger
2860 * hotplug/hotunplug operations.
2861 */
2862 mutex_lock(&acpi_scan_lock);
2863 /*
2864 * Enumerate devices in the ACPI namespace.
2865 */
2866 if (acpi_bus_scan(ACPI_ROOT_OBJECT))
2867 goto unlock;
2868
2869 acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);
2870 if (!acpi_root)
2871 goto unlock;
2872
2873 /* Fixed feature devices do not exist on HW-reduced platform */
2874 if (!acpi_gbl_reduced_hardware)
2875 acpi_bus_scan_fixed();
2876
2877 acpi_turn_off_unused_power_resources();
2878
2879 acpi_scan_initialized = true;
2880
2881unlock:
2882 mutex_unlock(&acpi_scan_lock);
2883}
2884
2885static struct acpi_probe_entry *ape;
2886static int acpi_probe_count;
2887static DEFINE_MUTEX(acpi_probe_mutex);
2888
2889static int __init acpi_match_madt(union acpi_subtable_headers *header,
2890 const unsigned long end)
2891{
2892 if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2893 if (!ape->probe_subtbl(header, end))
2894 acpi_probe_count++;
2895
2896 return 0;
2897}
2898
2899void __weak arch_sort_irqchip_probe(struct acpi_probe_entry *ap_head, int nr) { }
2900
2901int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2902{
2903 int count = 0;
2904
2905 if (acpi_disabled)
2906 return 0;
2907
2908 mutex_lock(&acpi_probe_mutex);
2909 arch_sort_irqchip_probe(ap_head, nr);
2910 for (ape = ap_head; nr; ape++, nr--) {
2911 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2912 acpi_probe_count = 0;
2913 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2914 count += acpi_probe_count;
2915 } else {
2916 int res;
2917 res = acpi_table_parse(ape->id, ape->probe_table);
2918 if (!res)
2919 count++;
2920 }
2921 }
2922 mutex_unlock(&acpi_probe_mutex);
2923
2924 return count;
2925}
2926
2927static void acpi_table_events_fn(struct work_struct *work)
2928{
2929 acpi_scan_lock_acquire();
2930 acpi_bus_scan(ACPI_ROOT_OBJECT);
2931 acpi_scan_lock_release();
2932
2933 kfree(work);
2934}
2935
2936void acpi_scan_table_notify(void)
2937{
2938 struct work_struct *work;
2939
2940 if (!acpi_scan_initialized)
2941 return;
2942
2943 work = kmalloc_obj(*work);
2944 if (!work)
2945 return;
2946
2947 INIT_WORK(work, acpi_table_events_fn);
2948 schedule_work(work);
2949}
2950
2951int acpi_reconfig_notifier_register(struct notifier_block *nb)
2952{
2953 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2954}
2955EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2956
2957int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2958{
2959 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2960}
2961EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);