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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 #include <linux/module.h>
7 #include <linux/init.h>
8 #include <linux/slab.h>
9 #include <linux/kernel.h>
10 #include <linux/acpi.h>
11 #include <linux/acpi_iort.h>
12 #include <linux/signal.h>
13 #include <linux/kthread.h>
14 #include <linux/dmi.h>
15 #include <linux/nls.h>
16 #include <linux/dma-map-ops.h>
17 #include <linux/platform_data/x86/apple.h>
18 #include <linux/pgtable.h>
19 
20 #include "internal.h"
21 
22 #define _COMPONENT		ACPI_BUS_COMPONENT
23 ACPI_MODULE_NAME("scan");
24 extern struct acpi_device *acpi_root;
25 
26 #define ACPI_BUS_CLASS			"system_bus"
27 #define ACPI_BUS_HID			"LNXSYBUS"
28 #define ACPI_BUS_DEVICE_NAME		"System Bus"
29 
30 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
31 
32 #define INVALID_ACPI_HANDLE	((acpi_handle)empty_zero_page)
33 
34 static const char *dummy_hid = "device";
35 
36 static LIST_HEAD(acpi_dep_list);
37 static DEFINE_MUTEX(acpi_dep_list_lock);
38 LIST_HEAD(acpi_bus_id_list);
39 static DEFINE_MUTEX(acpi_scan_lock);
40 static LIST_HEAD(acpi_scan_handlers_list);
41 DEFINE_MUTEX(acpi_device_lock);
42 LIST_HEAD(acpi_wakeup_device_list);
43 static DEFINE_MUTEX(acpi_hp_context_lock);
44 
45 /*
46  * The UART device described by the SPCR table is the only object which needs
47  * special-casing. Everything else is covered by ACPI namespace paths in STAO
48  * table.
49  */
50 static u64 spcr_uart_addr;
51 
52 struct acpi_dep_data {
53 	struct list_head node;
54 	acpi_handle master;
55 	acpi_handle slave;
56 };
57 
acpi_scan_lock_acquire(void)58 void acpi_scan_lock_acquire(void)
59 {
60 	mutex_lock(&acpi_scan_lock);
61 }
62 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
63 
acpi_scan_lock_release(void)64 void acpi_scan_lock_release(void)
65 {
66 	mutex_unlock(&acpi_scan_lock);
67 }
68 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
69 
acpi_lock_hp_context(void)70 void acpi_lock_hp_context(void)
71 {
72 	mutex_lock(&acpi_hp_context_lock);
73 }
74 
acpi_unlock_hp_context(void)75 void acpi_unlock_hp_context(void)
76 {
77 	mutex_unlock(&acpi_hp_context_lock);
78 }
79 
acpi_initialize_hp_context(struct acpi_device * adev,struct acpi_hotplug_context * hp,int (* notify)(struct acpi_device *,u32),void (* uevent)(struct acpi_device *,u32))80 void acpi_initialize_hp_context(struct acpi_device *adev,
81 				struct acpi_hotplug_context *hp,
82 				int (*notify)(struct acpi_device *, u32),
83 				void (*uevent)(struct acpi_device *, u32))
84 {
85 	acpi_lock_hp_context();
86 	hp->notify = notify;
87 	hp->uevent = uevent;
88 	acpi_set_hp_context(adev, hp);
89 	acpi_unlock_hp_context();
90 }
91 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
92 
acpi_scan_add_handler(struct acpi_scan_handler * handler)93 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
94 {
95 	if (!handler)
96 		return -EINVAL;
97 
98 	list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
99 	return 0;
100 }
101 
acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler * handler,const char * hotplug_profile_name)102 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
103 				       const char *hotplug_profile_name)
104 {
105 	int error;
106 
107 	error = acpi_scan_add_handler(handler);
108 	if (error)
109 		return error;
110 
111 	acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
112 	return 0;
113 }
114 
acpi_scan_is_offline(struct acpi_device * adev,bool uevent)115 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
116 {
117 	struct acpi_device_physical_node *pn;
118 	bool offline = true;
119 	char *envp[] = { "EVENT=offline", NULL };
120 
121 	/*
122 	 * acpi_container_offline() calls this for all of the container's
123 	 * children under the container's physical_node_lock lock.
124 	 */
125 	mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
126 
127 	list_for_each_entry(pn, &adev->physical_node_list, node)
128 		if (device_supports_offline(pn->dev) && !pn->dev->offline) {
129 			if (uevent)
130 				kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
131 
132 			offline = false;
133 			break;
134 		}
135 
136 	mutex_unlock(&adev->physical_node_lock);
137 	return offline;
138 }
139 
acpi_bus_offline(acpi_handle handle,u32 lvl,void * data,void ** ret_p)140 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
141 				    void **ret_p)
142 {
143 	struct acpi_device *device = NULL;
144 	struct acpi_device_physical_node *pn;
145 	bool second_pass = (bool)data;
146 	acpi_status status = AE_OK;
147 
148 	if (acpi_bus_get_device(handle, &device))
149 		return AE_OK;
150 
151 	if (device->handler && !device->handler->hotplug.enabled) {
152 		*ret_p = &device->dev;
153 		return AE_SUPPORT;
154 	}
155 
156 	mutex_lock(&device->physical_node_lock);
157 
158 	list_for_each_entry(pn, &device->physical_node_list, node) {
159 		int ret;
160 
161 		if (second_pass) {
162 			/* Skip devices offlined by the first pass. */
163 			if (pn->put_online)
164 				continue;
165 		} else {
166 			pn->put_online = false;
167 		}
168 		ret = device_offline(pn->dev);
169 		if (ret >= 0) {
170 			pn->put_online = !ret;
171 		} else {
172 			*ret_p = pn->dev;
173 			if (second_pass) {
174 				status = AE_ERROR;
175 				break;
176 			}
177 		}
178 	}
179 
180 	mutex_unlock(&device->physical_node_lock);
181 
182 	return status;
183 }
184 
acpi_bus_online(acpi_handle handle,u32 lvl,void * data,void ** ret_p)185 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
186 				   void **ret_p)
187 {
188 	struct acpi_device *device = NULL;
189 	struct acpi_device_physical_node *pn;
190 
191 	if (acpi_bus_get_device(handle, &device))
192 		return AE_OK;
193 
194 	mutex_lock(&device->physical_node_lock);
195 
196 	list_for_each_entry(pn, &device->physical_node_list, node)
197 		if (pn->put_online) {
198 			device_online(pn->dev);
199 			pn->put_online = false;
200 		}
201 
202 	mutex_unlock(&device->physical_node_lock);
203 
204 	return AE_OK;
205 }
206 
acpi_scan_try_to_offline(struct acpi_device * device)207 static int acpi_scan_try_to_offline(struct acpi_device *device)
208 {
209 	acpi_handle handle = device->handle;
210 	struct device *errdev = NULL;
211 	acpi_status status;
212 
213 	/*
214 	 * Carry out two passes here and ignore errors in the first pass,
215 	 * because if the devices in question are memory blocks and
216 	 * CONFIG_MEMCG is set, one of the blocks may hold data structures
217 	 * that the other blocks depend on, but it is not known in advance which
218 	 * block holds them.
219 	 *
220 	 * If the first pass is successful, the second one isn't needed, though.
221 	 */
222 	status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
223 				     NULL, acpi_bus_offline, (void *)false,
224 				     (void **)&errdev);
225 	if (status == AE_SUPPORT) {
226 		dev_warn(errdev, "Offline disabled.\n");
227 		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
228 				    acpi_bus_online, NULL, NULL, NULL);
229 		return -EPERM;
230 	}
231 	acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
232 	if (errdev) {
233 		errdev = NULL;
234 		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
235 				    NULL, acpi_bus_offline, (void *)true,
236 				    (void **)&errdev);
237 		if (!errdev)
238 			acpi_bus_offline(handle, 0, (void *)true,
239 					 (void **)&errdev);
240 
241 		if (errdev) {
242 			dev_warn(errdev, "Offline failed.\n");
243 			acpi_bus_online(handle, 0, NULL, NULL);
244 			acpi_walk_namespace(ACPI_TYPE_ANY, handle,
245 					    ACPI_UINT32_MAX, acpi_bus_online,
246 					    NULL, NULL, NULL);
247 			return -EBUSY;
248 		}
249 	}
250 	return 0;
251 }
252 
acpi_scan_hot_remove(struct acpi_device * device)253 static int acpi_scan_hot_remove(struct acpi_device *device)
254 {
255 	acpi_handle handle = device->handle;
256 	unsigned long long sta;
257 	acpi_status status;
258 
259 	if (device->handler && device->handler->hotplug.demand_offline) {
260 		if (!acpi_scan_is_offline(device, true))
261 			return -EBUSY;
262 	} else {
263 		int error = acpi_scan_try_to_offline(device);
264 		if (error)
265 			return error;
266 	}
267 
268 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
269 		"Hot-removing device %s...\n", dev_name(&device->dev)));
270 
271 	acpi_bus_trim(device);
272 
273 	acpi_evaluate_lck(handle, 0);
274 	/*
275 	 * TBD: _EJD support.
276 	 */
277 	status = acpi_evaluate_ej0(handle);
278 	if (status == AE_NOT_FOUND)
279 		return -ENODEV;
280 	else if (ACPI_FAILURE(status))
281 		return -EIO;
282 
283 	/*
284 	 * Verify if eject was indeed successful.  If not, log an error
285 	 * message.  No need to call _OST since _EJ0 call was made OK.
286 	 */
287 	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
288 	if (ACPI_FAILURE(status)) {
289 		acpi_handle_warn(handle,
290 			"Status check after eject failed (0x%x)\n", status);
291 	} else if (sta & ACPI_STA_DEVICE_ENABLED) {
292 		acpi_handle_warn(handle,
293 			"Eject incomplete - status 0x%llx\n", sta);
294 	}
295 
296 	return 0;
297 }
298 
acpi_scan_device_not_present(struct acpi_device * adev)299 static int acpi_scan_device_not_present(struct acpi_device *adev)
300 {
301 	if (!acpi_device_enumerated(adev)) {
302 		dev_warn(&adev->dev, "Still not present\n");
303 		return -EALREADY;
304 	}
305 	acpi_bus_trim(adev);
306 	return 0;
307 }
308 
acpi_scan_device_check(struct acpi_device * adev)309 static int acpi_scan_device_check(struct acpi_device *adev)
310 {
311 	int error;
312 
313 	acpi_bus_get_status(adev);
314 	if (adev->status.present || adev->status.functional) {
315 		/*
316 		 * This function is only called for device objects for which
317 		 * matching scan handlers exist.  The only situation in which
318 		 * the scan handler is not attached to this device object yet
319 		 * is when the device has just appeared (either it wasn't
320 		 * present at all before or it was removed and then added
321 		 * again).
322 		 */
323 		if (adev->handler) {
324 			dev_warn(&adev->dev, "Already enumerated\n");
325 			return -EALREADY;
326 		}
327 		error = acpi_bus_scan(adev->handle);
328 		if (error) {
329 			dev_warn(&adev->dev, "Namespace scan failure\n");
330 			return error;
331 		}
332 		if (!adev->handler) {
333 			dev_warn(&adev->dev, "Enumeration failure\n");
334 			error = -ENODEV;
335 		}
336 	} else {
337 		error = acpi_scan_device_not_present(adev);
338 	}
339 	return error;
340 }
341 
acpi_scan_bus_check(struct acpi_device * adev)342 static int acpi_scan_bus_check(struct acpi_device *adev)
343 {
344 	struct acpi_scan_handler *handler = adev->handler;
345 	struct acpi_device *child;
346 	int error;
347 
348 	acpi_bus_get_status(adev);
349 	if (!(adev->status.present || adev->status.functional)) {
350 		acpi_scan_device_not_present(adev);
351 		return 0;
352 	}
353 	if (handler && handler->hotplug.scan_dependent)
354 		return handler->hotplug.scan_dependent(adev);
355 
356 	error = acpi_bus_scan(adev->handle);
357 	if (error) {
358 		dev_warn(&adev->dev, "Namespace scan failure\n");
359 		return error;
360 	}
361 	list_for_each_entry(child, &adev->children, node) {
362 		error = acpi_scan_bus_check(child);
363 		if (error)
364 			return error;
365 	}
366 	return 0;
367 }
368 
acpi_generic_hotplug_event(struct acpi_device * adev,u32 type)369 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
370 {
371 	switch (type) {
372 	case ACPI_NOTIFY_BUS_CHECK:
373 		return acpi_scan_bus_check(adev);
374 	case ACPI_NOTIFY_DEVICE_CHECK:
375 		return acpi_scan_device_check(adev);
376 	case ACPI_NOTIFY_EJECT_REQUEST:
377 	case ACPI_OST_EC_OSPM_EJECT:
378 		if (adev->handler && !adev->handler->hotplug.enabled) {
379 			dev_info(&adev->dev, "Eject disabled\n");
380 			return -EPERM;
381 		}
382 		acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
383 				  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
384 		return acpi_scan_hot_remove(adev);
385 	}
386 	return -EINVAL;
387 }
388 
acpi_device_hotplug(struct acpi_device * adev,u32 src)389 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
390 {
391 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
392 	int error = -ENODEV;
393 
394 	lock_device_hotplug();
395 	mutex_lock(&acpi_scan_lock);
396 
397 	/*
398 	 * The device object's ACPI handle cannot become invalid as long as we
399 	 * are holding acpi_scan_lock, but it might have become invalid before
400 	 * that lock was acquired.
401 	 */
402 	if (adev->handle == INVALID_ACPI_HANDLE)
403 		goto err_out;
404 
405 	if (adev->flags.is_dock_station) {
406 		error = dock_notify(adev, src);
407 	} else if (adev->flags.hotplug_notify) {
408 		error = acpi_generic_hotplug_event(adev, src);
409 	} else {
410 		int (*notify)(struct acpi_device *, u32);
411 
412 		acpi_lock_hp_context();
413 		notify = adev->hp ? adev->hp->notify : NULL;
414 		acpi_unlock_hp_context();
415 		/*
416 		 * There may be additional notify handlers for device objects
417 		 * without the .event() callback, so ignore them here.
418 		 */
419 		if (notify)
420 			error = notify(adev, src);
421 		else
422 			goto out;
423 	}
424 	switch (error) {
425 	case 0:
426 		ost_code = ACPI_OST_SC_SUCCESS;
427 		break;
428 	case -EPERM:
429 		ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
430 		break;
431 	case -EBUSY:
432 		ost_code = ACPI_OST_SC_DEVICE_BUSY;
433 		break;
434 	default:
435 		ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
436 		break;
437 	}
438 
439  err_out:
440 	acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
441 
442  out:
443 	acpi_bus_put_acpi_device(adev);
444 	mutex_unlock(&acpi_scan_lock);
445 	unlock_device_hotplug();
446 }
447 
acpi_free_power_resources_lists(struct acpi_device * device)448 static void acpi_free_power_resources_lists(struct acpi_device *device)
449 {
450 	int i;
451 
452 	if (device->wakeup.flags.valid)
453 		acpi_power_resources_list_free(&device->wakeup.resources);
454 
455 	if (!device->power.flags.power_resources)
456 		return;
457 
458 	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
459 		struct acpi_device_power_state *ps = &device->power.states[i];
460 		acpi_power_resources_list_free(&ps->resources);
461 	}
462 }
463 
acpi_device_release(struct device * dev)464 static void acpi_device_release(struct device *dev)
465 {
466 	struct acpi_device *acpi_dev = to_acpi_device(dev);
467 
468 	acpi_free_properties(acpi_dev);
469 	acpi_free_pnp_ids(&acpi_dev->pnp);
470 	acpi_free_power_resources_lists(acpi_dev);
471 	kfree(acpi_dev);
472 }
473 
acpi_device_del(struct acpi_device * device)474 static void acpi_device_del(struct acpi_device *device)
475 {
476 	struct acpi_device_bus_id *acpi_device_bus_id;
477 
478 	mutex_lock(&acpi_device_lock);
479 	if (device->parent)
480 		list_del(&device->node);
481 
482 	list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
483 		if (!strcmp(acpi_device_bus_id->bus_id,
484 			    acpi_device_hid(device))) {
485 			ida_simple_remove(&acpi_device_bus_id->instance_ida, device->pnp.instance_no);
486 			if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
487 				list_del(&acpi_device_bus_id->node);
488 				kfree_const(acpi_device_bus_id->bus_id);
489 				kfree(acpi_device_bus_id);
490 			}
491 			break;
492 		}
493 
494 	list_del(&device->wakeup_list);
495 	mutex_unlock(&acpi_device_lock);
496 
497 	acpi_power_add_remove_device(device, false);
498 	acpi_device_remove_files(device);
499 	if (device->remove)
500 		device->remove(device);
501 
502 	device_del(&device->dev);
503 }
504 
505 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
506 
507 static LIST_HEAD(acpi_device_del_list);
508 static DEFINE_MUTEX(acpi_device_del_lock);
509 
acpi_device_del_work_fn(struct work_struct * work_not_used)510 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
511 {
512 	for (;;) {
513 		struct acpi_device *adev;
514 
515 		mutex_lock(&acpi_device_del_lock);
516 
517 		if (list_empty(&acpi_device_del_list)) {
518 			mutex_unlock(&acpi_device_del_lock);
519 			break;
520 		}
521 		adev = list_first_entry(&acpi_device_del_list,
522 					struct acpi_device, del_list);
523 		list_del(&adev->del_list);
524 
525 		mutex_unlock(&acpi_device_del_lock);
526 
527 		blocking_notifier_call_chain(&acpi_reconfig_chain,
528 					     ACPI_RECONFIG_DEVICE_REMOVE, adev);
529 
530 		acpi_device_del(adev);
531 		/*
532 		 * Drop references to all power resources that might have been
533 		 * used by the device.
534 		 */
535 		acpi_power_transition(adev, ACPI_STATE_D3_COLD);
536 		put_device(&adev->dev);
537 	}
538 }
539 
540 /**
541  * acpi_scan_drop_device - Drop an ACPI device object.
542  * @handle: Handle of an ACPI namespace node, not used.
543  * @context: Address of the ACPI device object to drop.
544  *
545  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
546  * namespace node the device object pointed to by @context is attached to.
547  *
548  * The unregistration is carried out asynchronously to avoid running
549  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
550  * ensure the correct ordering (the device objects must be unregistered in the
551  * same order in which the corresponding namespace nodes are deleted).
552  */
acpi_scan_drop_device(acpi_handle handle,void * context)553 static void acpi_scan_drop_device(acpi_handle handle, void *context)
554 {
555 	static DECLARE_WORK(work, acpi_device_del_work_fn);
556 	struct acpi_device *adev = context;
557 
558 	mutex_lock(&acpi_device_del_lock);
559 
560 	/*
561 	 * Use the ACPI hotplug workqueue which is ordered, so this work item
562 	 * won't run after any hotplug work items submitted subsequently.  That
563 	 * prevents attempts to register device objects identical to those being
564 	 * deleted from happening concurrently (such attempts result from
565 	 * hotplug events handled via the ACPI hotplug workqueue).  It also will
566 	 * run after all of the work items submitted previosuly, which helps
567 	 * those work items to ensure that they are not accessing stale device
568 	 * objects.
569 	 */
570 	if (list_empty(&acpi_device_del_list))
571 		acpi_queue_hotplug_work(&work);
572 
573 	list_add_tail(&adev->del_list, &acpi_device_del_list);
574 	/* Make acpi_ns_validate_handle() return NULL for this handle. */
575 	adev->handle = INVALID_ACPI_HANDLE;
576 
577 	mutex_unlock(&acpi_device_del_lock);
578 }
579 
acpi_get_device_data(acpi_handle handle,struct acpi_device ** device,void (* callback)(void *))580 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
581 				void (*callback)(void *))
582 {
583 	acpi_status status;
584 
585 	if (!device)
586 		return -EINVAL;
587 
588 	*device = NULL;
589 
590 	status = acpi_get_data_full(handle, acpi_scan_drop_device,
591 				    (void **)device, callback);
592 	if (ACPI_FAILURE(status) || !*device) {
593 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
594 				  handle));
595 		return -ENODEV;
596 	}
597 	return 0;
598 }
599 
acpi_bus_get_device(acpi_handle handle,struct acpi_device ** device)600 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
601 {
602 	return acpi_get_device_data(handle, device, NULL);
603 }
604 EXPORT_SYMBOL(acpi_bus_get_device);
605 
get_acpi_device(void * dev)606 static void get_acpi_device(void *dev)
607 {
608 	if (dev)
609 		get_device(&((struct acpi_device *)dev)->dev);
610 }
611 
acpi_bus_get_acpi_device(acpi_handle handle)612 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
613 {
614 	struct acpi_device *adev = NULL;
615 
616 	acpi_get_device_data(handle, &adev, get_acpi_device);
617 	return adev;
618 }
619 
acpi_bus_put_acpi_device(struct acpi_device * adev)620 void acpi_bus_put_acpi_device(struct acpi_device *adev)
621 {
622 	put_device(&adev->dev);
623 }
624 
acpi_device_bus_id_match(const char * dev_id)625 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
626 {
627 	struct acpi_device_bus_id *acpi_device_bus_id;
628 
629 	/* Find suitable bus_id and instance number in acpi_bus_id_list. */
630 	list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
631 		if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
632 			return acpi_device_bus_id;
633 	}
634 	return NULL;
635 }
636 
acpi_device_set_name(struct acpi_device * device,struct acpi_device_bus_id * acpi_device_bus_id)637 static int acpi_device_set_name(struct acpi_device *device,
638 				struct acpi_device_bus_id *acpi_device_bus_id)
639 {
640 	struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
641 	int result;
642 
643 	result = ida_simple_get(instance_ida, 0, ACPI_MAX_DEVICE_INSTANCES, GFP_KERNEL);
644 	if (result < 0)
645 		return result;
646 
647 	device->pnp.instance_no = result;
648 	dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
649 	return 0;
650 }
651 
acpi_device_add(struct acpi_device * device,void (* release)(struct device *))652 int acpi_device_add(struct acpi_device *device,
653 		    void (*release)(struct device *))
654 {
655 	struct acpi_device_bus_id *acpi_device_bus_id;
656 	int result;
657 
658 	if (device->handle) {
659 		acpi_status status;
660 
661 		status = acpi_attach_data(device->handle, acpi_scan_drop_device,
662 					  device);
663 		if (ACPI_FAILURE(status)) {
664 			acpi_handle_err(device->handle,
665 					"Unable to attach device data\n");
666 			return -ENODEV;
667 		}
668 	}
669 
670 	/*
671 	 * Linkage
672 	 * -------
673 	 * Link this device to its parent and siblings.
674 	 */
675 	INIT_LIST_HEAD(&device->children);
676 	INIT_LIST_HEAD(&device->node);
677 	INIT_LIST_HEAD(&device->wakeup_list);
678 	INIT_LIST_HEAD(&device->physical_node_list);
679 	INIT_LIST_HEAD(&device->del_list);
680 	mutex_init(&device->physical_node_lock);
681 
682 	mutex_lock(&acpi_device_lock);
683 
684 	acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
685 	if (acpi_device_bus_id) {
686 		result = acpi_device_set_name(device, acpi_device_bus_id);
687 		if (result)
688 			goto err_unlock;
689 	} else {
690 		acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
691 					     GFP_KERNEL);
692 		if (!acpi_device_bus_id) {
693 			result = -ENOMEM;
694 			goto err_unlock;
695 		}
696 		acpi_device_bus_id->bus_id =
697 			kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
698 		if (!acpi_device_bus_id->bus_id) {
699 			kfree(acpi_device_bus_id);
700 			result = -ENOMEM;
701 			goto err_unlock;
702 		}
703 
704 		ida_init(&acpi_device_bus_id->instance_ida);
705 
706 		result = acpi_device_set_name(device, acpi_device_bus_id);
707 		if (result) {
708 			kfree_const(acpi_device_bus_id->bus_id);
709 			kfree(acpi_device_bus_id);
710 			goto err_unlock;
711 		}
712 
713 		list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
714 	}
715 
716 	if (device->parent)
717 		list_add_tail(&device->node, &device->parent->children);
718 
719 	if (device->wakeup.flags.valid)
720 		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
721 	mutex_unlock(&acpi_device_lock);
722 
723 	if (device->parent)
724 		device->dev.parent = &device->parent->dev;
725 	device->dev.bus = &acpi_bus_type;
726 	device->dev.release = release;
727 	result = device_add(&device->dev);
728 	if (result) {
729 		dev_err(&device->dev, "Error registering device\n");
730 		goto err;
731 	}
732 
733 	result = acpi_device_setup_files(device);
734 	if (result)
735 		printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
736 		       dev_name(&device->dev));
737 
738 	return 0;
739 
740  err:
741 	mutex_lock(&acpi_device_lock);
742 	if (device->parent)
743 		list_del(&device->node);
744 	list_del(&device->wakeup_list);
745 
746  err_unlock:
747 	mutex_unlock(&acpi_device_lock);
748 
749 	acpi_detach_data(device->handle, acpi_scan_drop_device);
750 	return result;
751 }
752 
753 /* --------------------------------------------------------------------------
754                                  Device Enumeration
755    -------------------------------------------------------------------------- */
acpi_bus_get_parent(acpi_handle handle)756 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
757 {
758 	struct acpi_device *device = NULL;
759 	acpi_status status;
760 
761 	/*
762 	 * Fixed hardware devices do not appear in the namespace and do not
763 	 * have handles, but we fabricate acpi_devices for them, so we have
764 	 * to deal with them specially.
765 	 */
766 	if (!handle)
767 		return acpi_root;
768 
769 	do {
770 		status = acpi_get_parent(handle, &handle);
771 		if (ACPI_FAILURE(status))
772 			return status == AE_NULL_ENTRY ? NULL : acpi_root;
773 	} while (acpi_bus_get_device(handle, &device));
774 	return device;
775 }
776 
777 acpi_status
acpi_bus_get_ejd(acpi_handle handle,acpi_handle * ejd)778 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
779 {
780 	acpi_status status;
781 	acpi_handle tmp;
782 	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
783 	union acpi_object *obj;
784 
785 	status = acpi_get_handle(handle, "_EJD", &tmp);
786 	if (ACPI_FAILURE(status))
787 		return status;
788 
789 	status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
790 	if (ACPI_SUCCESS(status)) {
791 		obj = buffer.pointer;
792 		status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
793 					 ejd);
794 		kfree(buffer.pointer);
795 	}
796 	return status;
797 }
798 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
799 
acpi_bus_extract_wakeup_device_power_package(struct acpi_device * dev)800 static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
801 {
802 	acpi_handle handle = dev->handle;
803 	struct acpi_device_wakeup *wakeup = &dev->wakeup;
804 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
805 	union acpi_object *package = NULL;
806 	union acpi_object *element = NULL;
807 	acpi_status status;
808 	int err = -ENODATA;
809 
810 	INIT_LIST_HEAD(&wakeup->resources);
811 
812 	/* _PRW */
813 	status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
814 	if (ACPI_FAILURE(status)) {
815 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
816 		return err;
817 	}
818 
819 	package = (union acpi_object *)buffer.pointer;
820 
821 	if (!package || package->package.count < 2)
822 		goto out;
823 
824 	element = &(package->package.elements[0]);
825 	if (!element)
826 		goto out;
827 
828 	if (element->type == ACPI_TYPE_PACKAGE) {
829 		if ((element->package.count < 2) ||
830 		    (element->package.elements[0].type !=
831 		     ACPI_TYPE_LOCAL_REFERENCE)
832 		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
833 			goto out;
834 
835 		wakeup->gpe_device =
836 		    element->package.elements[0].reference.handle;
837 		wakeup->gpe_number =
838 		    (u32) element->package.elements[1].integer.value;
839 	} else if (element->type == ACPI_TYPE_INTEGER) {
840 		wakeup->gpe_device = NULL;
841 		wakeup->gpe_number = element->integer.value;
842 	} else {
843 		goto out;
844 	}
845 
846 	element = &(package->package.elements[1]);
847 	if (element->type != ACPI_TYPE_INTEGER)
848 		goto out;
849 
850 	wakeup->sleep_state = element->integer.value;
851 
852 	err = acpi_extract_power_resources(package, 2, &wakeup->resources);
853 	if (err)
854 		goto out;
855 
856 	if (!list_empty(&wakeup->resources)) {
857 		int sleep_state;
858 
859 		err = acpi_power_wakeup_list_init(&wakeup->resources,
860 						  &sleep_state);
861 		if (err) {
862 			acpi_handle_warn(handle, "Retrieving current states "
863 					 "of wakeup power resources failed\n");
864 			acpi_power_resources_list_free(&wakeup->resources);
865 			goto out;
866 		}
867 		if (sleep_state < wakeup->sleep_state) {
868 			acpi_handle_warn(handle, "Overriding _PRW sleep state "
869 					 "(S%d) by S%d from power resources\n",
870 					 (int)wakeup->sleep_state, sleep_state);
871 			wakeup->sleep_state = sleep_state;
872 		}
873 	}
874 
875  out:
876 	kfree(buffer.pointer);
877 	return err;
878 }
879 
acpi_wakeup_gpe_init(struct acpi_device * device)880 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
881 {
882 	static const struct acpi_device_id button_device_ids[] = {
883 		{"PNP0C0C", 0},		/* Power button */
884 		{"PNP0C0D", 0},		/* Lid */
885 		{"PNP0C0E", 0},		/* Sleep button */
886 		{"", 0},
887 	};
888 	struct acpi_device_wakeup *wakeup = &device->wakeup;
889 	acpi_status status;
890 
891 	wakeup->flags.notifier_present = 0;
892 
893 	/* Power button, Lid switch always enable wakeup */
894 	if (!acpi_match_device_ids(device, button_device_ids)) {
895 		if (!acpi_match_device_ids(device, &button_device_ids[1])) {
896 			/* Do not use Lid/sleep button for S5 wakeup */
897 			if (wakeup->sleep_state == ACPI_STATE_S5)
898 				wakeup->sleep_state = ACPI_STATE_S4;
899 		}
900 		acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
901 		device_set_wakeup_capable(&device->dev, true);
902 		return true;
903 	}
904 
905 	status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
906 					 wakeup->gpe_number);
907 	return ACPI_SUCCESS(status);
908 }
909 
acpi_bus_get_wakeup_device_flags(struct acpi_device * device)910 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
911 {
912 	int err;
913 
914 	/* Presence of _PRW indicates wake capable */
915 	if (!acpi_has_method(device->handle, "_PRW"))
916 		return;
917 
918 	err = acpi_bus_extract_wakeup_device_power_package(device);
919 	if (err) {
920 		dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
921 		return;
922 	}
923 
924 	device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
925 	device->wakeup.prepare_count = 0;
926 	/*
927 	 * Call _PSW/_DSW object to disable its ability to wake the sleeping
928 	 * system for the ACPI device with the _PRW object.
929 	 * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
930 	 * So it is necessary to call _DSW object first. Only when it is not
931 	 * present will the _PSW object used.
932 	 */
933 	err = acpi_device_sleep_wake(device, 0, 0, 0);
934 	if (err)
935 		pr_debug("error in _DSW or _PSW evaluation\n");
936 }
937 
acpi_bus_init_power_state(struct acpi_device * device,int state)938 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
939 {
940 	struct acpi_device_power_state *ps = &device->power.states[state];
941 	char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
942 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
943 	acpi_status status;
944 
945 	INIT_LIST_HEAD(&ps->resources);
946 
947 	/* Evaluate "_PRx" to get referenced power resources */
948 	status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
949 	if (ACPI_SUCCESS(status)) {
950 		union acpi_object *package = buffer.pointer;
951 
952 		if (buffer.length && package
953 		    && package->type == ACPI_TYPE_PACKAGE
954 		    && package->package.count)
955 			acpi_extract_power_resources(package, 0, &ps->resources);
956 
957 		ACPI_FREE(buffer.pointer);
958 	}
959 
960 	/* Evaluate "_PSx" to see if we can do explicit sets */
961 	pathname[2] = 'S';
962 	if (acpi_has_method(device->handle, pathname))
963 		ps->flags.explicit_set = 1;
964 
965 	/* State is valid if there are means to put the device into it. */
966 	if (!list_empty(&ps->resources) || ps->flags.explicit_set)
967 		ps->flags.valid = 1;
968 
969 	ps->power = -1;		/* Unknown - driver assigned */
970 	ps->latency = -1;	/* Unknown - driver assigned */
971 }
972 
acpi_bus_get_power_flags(struct acpi_device * device)973 static void acpi_bus_get_power_flags(struct acpi_device *device)
974 {
975 	u32 i;
976 
977 	/* Presence of _PS0|_PR0 indicates 'power manageable' */
978 	if (!acpi_has_method(device->handle, "_PS0") &&
979 	    !acpi_has_method(device->handle, "_PR0"))
980 		return;
981 
982 	device->flags.power_manageable = 1;
983 
984 	/*
985 	 * Power Management Flags
986 	 */
987 	if (acpi_has_method(device->handle, "_PSC"))
988 		device->power.flags.explicit_get = 1;
989 
990 	if (acpi_has_method(device->handle, "_IRC"))
991 		device->power.flags.inrush_current = 1;
992 
993 	if (acpi_has_method(device->handle, "_DSW"))
994 		device->power.flags.dsw_present = 1;
995 
996 	/*
997 	 * Enumerate supported power management states
998 	 */
999 	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1000 		acpi_bus_init_power_state(device, i);
1001 
1002 	INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1003 
1004 	/* Set the defaults for D0 and D3hot (always supported). */
1005 	device->power.states[ACPI_STATE_D0].flags.valid = 1;
1006 	device->power.states[ACPI_STATE_D0].power = 100;
1007 	device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1008 
1009 	/*
1010 	 * Use power resources only if the D0 list of them is populated, because
1011 	 * some platforms may provide _PR3 only to indicate D3cold support and
1012 	 * in those cases the power resources list returned by it may be bogus.
1013 	 */
1014 	if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1015 		device->power.flags.power_resources = 1;
1016 		/*
1017 		 * D3cold is supported if the D3hot list of power resources is
1018 		 * not empty.
1019 		 */
1020 		if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1021 			device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1022 	}
1023 
1024 	if (acpi_bus_init_power(device))
1025 		device->flags.power_manageable = 0;
1026 }
1027 
acpi_bus_get_flags(struct acpi_device * device)1028 static void acpi_bus_get_flags(struct acpi_device *device)
1029 {
1030 	/* Presence of _STA indicates 'dynamic_status' */
1031 	if (acpi_has_method(device->handle, "_STA"))
1032 		device->flags.dynamic_status = 1;
1033 
1034 	/* Presence of _RMV indicates 'removable' */
1035 	if (acpi_has_method(device->handle, "_RMV"))
1036 		device->flags.removable = 1;
1037 
1038 	/* Presence of _EJD|_EJ0 indicates 'ejectable' */
1039 	if (acpi_has_method(device->handle, "_EJD") ||
1040 	    acpi_has_method(device->handle, "_EJ0"))
1041 		device->flags.ejectable = 1;
1042 }
1043 
acpi_device_get_busid(struct acpi_device * device)1044 static void acpi_device_get_busid(struct acpi_device *device)
1045 {
1046 	char bus_id[5] = { '?', 0 };
1047 	struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1048 	int i = 0;
1049 
1050 	/*
1051 	 * Bus ID
1052 	 * ------
1053 	 * The device's Bus ID is simply the object name.
1054 	 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1055 	 */
1056 	if (ACPI_IS_ROOT_DEVICE(device)) {
1057 		strcpy(device->pnp.bus_id, "ACPI");
1058 		return;
1059 	}
1060 
1061 	switch (device->device_type) {
1062 	case ACPI_BUS_TYPE_POWER_BUTTON:
1063 		strcpy(device->pnp.bus_id, "PWRF");
1064 		break;
1065 	case ACPI_BUS_TYPE_SLEEP_BUTTON:
1066 		strcpy(device->pnp.bus_id, "SLPF");
1067 		break;
1068 	case ACPI_BUS_TYPE_ECDT_EC:
1069 		strcpy(device->pnp.bus_id, "ECDT");
1070 		break;
1071 	default:
1072 		acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1073 		/* Clean up trailing underscores (if any) */
1074 		for (i = 3; i > 1; i--) {
1075 			if (bus_id[i] == '_')
1076 				bus_id[i] = '\0';
1077 			else
1078 				break;
1079 		}
1080 		strcpy(device->pnp.bus_id, bus_id);
1081 		break;
1082 	}
1083 }
1084 
1085 /*
1086  * acpi_ata_match - see if an acpi object is an ATA device
1087  *
1088  * If an acpi object has one of the ACPI ATA methods defined,
1089  * then we can safely call it an ATA device.
1090  */
acpi_ata_match(acpi_handle handle)1091 bool acpi_ata_match(acpi_handle handle)
1092 {
1093 	return acpi_has_method(handle, "_GTF") ||
1094 	       acpi_has_method(handle, "_GTM") ||
1095 	       acpi_has_method(handle, "_STM") ||
1096 	       acpi_has_method(handle, "_SDD");
1097 }
1098 
1099 /*
1100  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1101  *
1102  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1103  * then we can safely call it an ejectable drive bay
1104  */
acpi_bay_match(acpi_handle handle)1105 bool acpi_bay_match(acpi_handle handle)
1106 {
1107 	acpi_handle phandle;
1108 
1109 	if (!acpi_has_method(handle, "_EJ0"))
1110 		return false;
1111 	if (acpi_ata_match(handle))
1112 		return true;
1113 	if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1114 		return false;
1115 
1116 	return acpi_ata_match(phandle);
1117 }
1118 
acpi_device_is_battery(struct acpi_device * adev)1119 bool acpi_device_is_battery(struct acpi_device *adev)
1120 {
1121 	struct acpi_hardware_id *hwid;
1122 
1123 	list_for_each_entry(hwid, &adev->pnp.ids, list)
1124 		if (!strcmp("PNP0C0A", hwid->id))
1125 			return true;
1126 
1127 	return false;
1128 }
1129 
is_ejectable_bay(struct acpi_device * adev)1130 static bool is_ejectable_bay(struct acpi_device *adev)
1131 {
1132 	acpi_handle handle = adev->handle;
1133 
1134 	if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1135 		return true;
1136 
1137 	return acpi_bay_match(handle);
1138 }
1139 
1140 /*
1141  * acpi_dock_match - see if an acpi object has a _DCK method
1142  */
acpi_dock_match(acpi_handle handle)1143 bool acpi_dock_match(acpi_handle handle)
1144 {
1145 	return acpi_has_method(handle, "_DCK");
1146 }
1147 
1148 static acpi_status
acpi_backlight_cap_match(acpi_handle handle,u32 level,void * context,void ** return_value)1149 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1150 			  void **return_value)
1151 {
1152 	long *cap = context;
1153 
1154 	if (acpi_has_method(handle, "_BCM") &&
1155 	    acpi_has_method(handle, "_BCL")) {
1156 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1157 				  "support\n"));
1158 		*cap |= ACPI_VIDEO_BACKLIGHT;
1159 		/* We have backlight support, no need to scan further */
1160 		return AE_CTRL_TERMINATE;
1161 	}
1162 	return 0;
1163 }
1164 
1165 /* Returns true if the ACPI object is a video device which can be
1166  * handled by video.ko.
1167  * The device will get a Linux specific CID added in scan.c to
1168  * identify the device as an ACPI graphics device
1169  * Be aware that the graphics device may not be physically present
1170  * Use acpi_video_get_capabilities() to detect general ACPI video
1171  * capabilities of present cards
1172  */
acpi_is_video_device(acpi_handle handle)1173 long acpi_is_video_device(acpi_handle handle)
1174 {
1175 	long video_caps = 0;
1176 
1177 	/* Is this device able to support video switching ? */
1178 	if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1179 		video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1180 
1181 	/* Is this device able to retrieve a video ROM ? */
1182 	if (acpi_has_method(handle, "_ROM"))
1183 		video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1184 
1185 	/* Is this device able to configure which video head to be POSTed ? */
1186 	if (acpi_has_method(handle, "_VPO") &&
1187 	    acpi_has_method(handle, "_GPD") &&
1188 	    acpi_has_method(handle, "_SPD"))
1189 		video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1190 
1191 	/* Only check for backlight functionality if one of the above hit. */
1192 	if (video_caps)
1193 		acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1194 				    ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1195 				    &video_caps, NULL);
1196 
1197 	return video_caps;
1198 }
1199 EXPORT_SYMBOL(acpi_is_video_device);
1200 
acpi_device_hid(struct acpi_device * device)1201 const char *acpi_device_hid(struct acpi_device *device)
1202 {
1203 	struct acpi_hardware_id *hid;
1204 
1205 	if (list_empty(&device->pnp.ids))
1206 		return dummy_hid;
1207 
1208 	hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1209 	return hid->id;
1210 }
1211 EXPORT_SYMBOL(acpi_device_hid);
1212 
acpi_add_id(struct acpi_device_pnp * pnp,const char * dev_id)1213 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1214 {
1215 	struct acpi_hardware_id *id;
1216 
1217 	id = kmalloc(sizeof(*id), GFP_KERNEL);
1218 	if (!id)
1219 		return;
1220 
1221 	id->id = kstrdup_const(dev_id, GFP_KERNEL);
1222 	if (!id->id) {
1223 		kfree(id);
1224 		return;
1225 	}
1226 
1227 	list_add_tail(&id->list, &pnp->ids);
1228 	pnp->type.hardware_id = 1;
1229 }
1230 
1231 /*
1232  * Old IBM workstations have a DSDT bug wherein the SMBus object
1233  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1234  * prefix.  Work around this.
1235  */
acpi_ibm_smbus_match(acpi_handle handle)1236 static bool acpi_ibm_smbus_match(acpi_handle handle)
1237 {
1238 	char node_name[ACPI_PATH_SEGMENT_LENGTH];
1239 	struct acpi_buffer path = { sizeof(node_name), node_name };
1240 
1241 	if (!dmi_name_in_vendors("IBM"))
1242 		return false;
1243 
1244 	/* Look for SMBS object */
1245 	if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1246 	    strcmp("SMBS", path.pointer))
1247 		return false;
1248 
1249 	/* Does it have the necessary (but misnamed) methods? */
1250 	if (acpi_has_method(handle, "SBI") &&
1251 	    acpi_has_method(handle, "SBR") &&
1252 	    acpi_has_method(handle, "SBW"))
1253 		return true;
1254 
1255 	return false;
1256 }
1257 
acpi_object_is_system_bus(acpi_handle handle)1258 static bool acpi_object_is_system_bus(acpi_handle handle)
1259 {
1260 	acpi_handle tmp;
1261 
1262 	if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1263 	    tmp == handle)
1264 		return true;
1265 	if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1266 	    tmp == handle)
1267 		return true;
1268 
1269 	return false;
1270 }
1271 
acpi_set_pnp_ids(acpi_handle handle,struct acpi_device_pnp * pnp,int device_type)1272 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1273 				int device_type)
1274 {
1275 	acpi_status status;
1276 	struct acpi_device_info *info;
1277 	struct acpi_pnp_device_id_list *cid_list;
1278 	int i;
1279 
1280 	switch (device_type) {
1281 	case ACPI_BUS_TYPE_DEVICE:
1282 		if (handle == ACPI_ROOT_OBJECT) {
1283 			acpi_add_id(pnp, ACPI_SYSTEM_HID);
1284 			break;
1285 		}
1286 
1287 		status = acpi_get_object_info(handle, &info);
1288 		if (ACPI_FAILURE(status)) {
1289 			pr_err(PREFIX "%s: Error reading device info\n",
1290 					__func__);
1291 			return;
1292 		}
1293 
1294 		if (info->valid & ACPI_VALID_HID) {
1295 			acpi_add_id(pnp, info->hardware_id.string);
1296 			pnp->type.platform_id = 1;
1297 		}
1298 		if (info->valid & ACPI_VALID_CID) {
1299 			cid_list = &info->compatible_id_list;
1300 			for (i = 0; i < cid_list->count; i++)
1301 				acpi_add_id(pnp, cid_list->ids[i].string);
1302 		}
1303 		if (info->valid & ACPI_VALID_ADR) {
1304 			pnp->bus_address = info->address;
1305 			pnp->type.bus_address = 1;
1306 		}
1307 		if (info->valid & ACPI_VALID_UID)
1308 			pnp->unique_id = kstrdup(info->unique_id.string,
1309 							GFP_KERNEL);
1310 		if (info->valid & ACPI_VALID_CLS)
1311 			acpi_add_id(pnp, info->class_code.string);
1312 
1313 		kfree(info);
1314 
1315 		/*
1316 		 * Some devices don't reliably have _HIDs & _CIDs, so add
1317 		 * synthetic HIDs to make sure drivers can find them.
1318 		 */
1319 		if (acpi_is_video_device(handle))
1320 			acpi_add_id(pnp, ACPI_VIDEO_HID);
1321 		else if (acpi_bay_match(handle))
1322 			acpi_add_id(pnp, ACPI_BAY_HID);
1323 		else if (acpi_dock_match(handle))
1324 			acpi_add_id(pnp, ACPI_DOCK_HID);
1325 		else if (acpi_ibm_smbus_match(handle))
1326 			acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1327 		else if (list_empty(&pnp->ids) &&
1328 			 acpi_object_is_system_bus(handle)) {
1329 			/* \_SB, \_TZ, LNXSYBUS */
1330 			acpi_add_id(pnp, ACPI_BUS_HID);
1331 			strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1332 			strcpy(pnp->device_class, ACPI_BUS_CLASS);
1333 		}
1334 
1335 		break;
1336 	case ACPI_BUS_TYPE_POWER:
1337 		acpi_add_id(pnp, ACPI_POWER_HID);
1338 		break;
1339 	case ACPI_BUS_TYPE_PROCESSOR:
1340 		acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1341 		break;
1342 	case ACPI_BUS_TYPE_THERMAL:
1343 		acpi_add_id(pnp, ACPI_THERMAL_HID);
1344 		break;
1345 	case ACPI_BUS_TYPE_POWER_BUTTON:
1346 		acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1347 		break;
1348 	case ACPI_BUS_TYPE_SLEEP_BUTTON:
1349 		acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1350 		break;
1351 	case ACPI_BUS_TYPE_ECDT_EC:
1352 		acpi_add_id(pnp, ACPI_ECDT_HID);
1353 		break;
1354 	}
1355 }
1356 
acpi_free_pnp_ids(struct acpi_device_pnp * pnp)1357 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1358 {
1359 	struct acpi_hardware_id *id, *tmp;
1360 
1361 	list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1362 		kfree_const(id->id);
1363 		kfree(id);
1364 	}
1365 	kfree(pnp->unique_id);
1366 }
1367 
1368 /**
1369  * acpi_dma_supported - Check DMA support for the specified device.
1370  * @adev: The pointer to acpi device
1371  *
1372  * Return false if DMA is not supported. Otherwise, return true
1373  */
acpi_dma_supported(struct acpi_device * adev)1374 bool acpi_dma_supported(struct acpi_device *adev)
1375 {
1376 	if (!adev)
1377 		return false;
1378 
1379 	if (adev->flags.cca_seen)
1380 		return true;
1381 
1382 	/*
1383 	* Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1384 	* DMA on "Intel platforms".  Presumably that includes all x86 and
1385 	* ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1386 	*/
1387 	if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1388 		return true;
1389 
1390 	return false;
1391 }
1392 
1393 /**
1394  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1395  * @adev: The pointer to acpi device
1396  *
1397  * Return enum dev_dma_attr.
1398  */
acpi_get_dma_attr(struct acpi_device * adev)1399 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1400 {
1401 	if (!acpi_dma_supported(adev))
1402 		return DEV_DMA_NOT_SUPPORTED;
1403 
1404 	if (adev->flags.coherent_dma)
1405 		return DEV_DMA_COHERENT;
1406 	else
1407 		return DEV_DMA_NON_COHERENT;
1408 }
1409 
1410 /**
1411  * acpi_dma_get_range() - Get device DMA parameters.
1412  *
1413  * @dev: device to configure
1414  * @dma_addr: pointer device DMA address result
1415  * @offset: pointer to the DMA offset result
1416  * @size: pointer to DMA range size result
1417  *
1418  * Evaluate DMA regions and return respectively DMA region start, offset
1419  * and size in dma_addr, offset and size on parsing success; it does not
1420  * update the passed in values on failure.
1421  *
1422  * Return 0 on success, < 0 on failure.
1423  */
acpi_dma_get_range(struct device * dev,u64 * dma_addr,u64 * offset,u64 * size)1424 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1425 		       u64 *size)
1426 {
1427 	struct acpi_device *adev;
1428 	LIST_HEAD(list);
1429 	struct resource_entry *rentry;
1430 	int ret;
1431 	struct device *dma_dev = dev;
1432 	u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1433 
1434 	/*
1435 	 * Walk the device tree chasing an ACPI companion with a _DMA
1436 	 * object while we go. Stop if we find a device with an ACPI
1437 	 * companion containing a _DMA method.
1438 	 */
1439 	do {
1440 		adev = ACPI_COMPANION(dma_dev);
1441 		if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1442 			break;
1443 
1444 		dma_dev = dma_dev->parent;
1445 	} while (dma_dev);
1446 
1447 	if (!dma_dev)
1448 		return -ENODEV;
1449 
1450 	if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1451 		acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1452 		return -EINVAL;
1453 	}
1454 
1455 	ret = acpi_dev_get_dma_resources(adev, &list);
1456 	if (ret > 0) {
1457 		list_for_each_entry(rentry, &list, node) {
1458 			if (dma_offset && rentry->offset != dma_offset) {
1459 				ret = -EINVAL;
1460 				dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1461 				goto out;
1462 			}
1463 			dma_offset = rentry->offset;
1464 
1465 			/* Take lower and upper limits */
1466 			if (rentry->res->start < dma_start)
1467 				dma_start = rentry->res->start;
1468 			if (rentry->res->end > dma_end)
1469 				dma_end = rentry->res->end;
1470 		}
1471 
1472 		if (dma_start >= dma_end) {
1473 			ret = -EINVAL;
1474 			dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1475 			goto out;
1476 		}
1477 
1478 		*dma_addr = dma_start - dma_offset;
1479 		len = dma_end - dma_start;
1480 		*size = max(len, len + 1);
1481 		*offset = dma_offset;
1482 	}
1483  out:
1484 	acpi_dev_free_resource_list(&list);
1485 
1486 	return ret >= 0 ? 0 : ret;
1487 }
1488 
1489 /**
1490  * acpi_dma_configure_id - Set-up DMA configuration for the device.
1491  * @dev: The pointer to the device
1492  * @attr: device dma attributes
1493  * @input_id: input device id const value pointer
1494  */
acpi_dma_configure_id(struct device * dev,enum dev_dma_attr attr,const u32 * input_id)1495 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1496 			  const u32 *input_id)
1497 {
1498 	const struct iommu_ops *iommu;
1499 	u64 dma_addr = 0, size = 0;
1500 
1501 	if (attr == DEV_DMA_NOT_SUPPORTED) {
1502 		set_dma_ops(dev, &dma_dummy_ops);
1503 		return 0;
1504 	}
1505 
1506 	iort_dma_setup(dev, &dma_addr, &size);
1507 
1508 	iommu = iort_iommu_configure_id(dev, input_id);
1509 	if (PTR_ERR(iommu) == -EPROBE_DEFER)
1510 		return -EPROBE_DEFER;
1511 
1512 	arch_setup_dma_ops(dev, dma_addr, size,
1513 				iommu, attr == DEV_DMA_COHERENT);
1514 
1515 	return 0;
1516 }
1517 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1518 
acpi_init_coherency(struct acpi_device * adev)1519 static void acpi_init_coherency(struct acpi_device *adev)
1520 {
1521 	unsigned long long cca = 0;
1522 	acpi_status status;
1523 	struct acpi_device *parent = adev->parent;
1524 
1525 	if (parent && parent->flags.cca_seen) {
1526 		/*
1527 		 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1528 		 * already saw one.
1529 		 */
1530 		adev->flags.cca_seen = 1;
1531 		cca = parent->flags.coherent_dma;
1532 	} else {
1533 		status = acpi_evaluate_integer(adev->handle, "_CCA",
1534 					       NULL, &cca);
1535 		if (ACPI_SUCCESS(status))
1536 			adev->flags.cca_seen = 1;
1537 		else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1538 			/*
1539 			 * If architecture does not specify that _CCA is
1540 			 * required for DMA-able devices (e.g. x86),
1541 			 * we default to _CCA=1.
1542 			 */
1543 			cca = 1;
1544 		else
1545 			acpi_handle_debug(adev->handle,
1546 					  "ACPI device is missing _CCA.\n");
1547 	}
1548 
1549 	adev->flags.coherent_dma = cca;
1550 }
1551 
acpi_check_serial_bus_slave(struct acpi_resource * ares,void * data)1552 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1553 {
1554 	bool *is_serial_bus_slave_p = data;
1555 
1556 	if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1557 		return 1;
1558 
1559 	*is_serial_bus_slave_p = true;
1560 
1561 	 /* no need to do more checking */
1562 	return -1;
1563 }
1564 
acpi_is_indirect_io_slave(struct acpi_device * device)1565 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1566 {
1567 	struct acpi_device *parent = device->parent;
1568 	static const struct acpi_device_id indirect_io_hosts[] = {
1569 		{"HISI0191", 0},
1570 		{}
1571 	};
1572 
1573 	return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1574 }
1575 
acpi_device_enumeration_by_parent(struct acpi_device * device)1576 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1577 {
1578 	struct list_head resource_list;
1579 	bool is_serial_bus_slave = false;
1580 	static const struct acpi_device_id ignore_serial_bus_ids[] = {
1581 	/*
1582 	 * These devices have multiple I2cSerialBus resources and an i2c-client
1583 	 * must be instantiated for each, each with its own i2c_device_id.
1584 	 * Normally we only instantiate an i2c-client for the first resource,
1585 	 * using the ACPI HID as id. These special cases are handled by the
1586 	 * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
1587 	 * which i2c_device_id to use for each resource.
1588 	 */
1589 		{"BSG1160", },
1590 		{"BSG2150", },
1591 		{"INT33FE", },
1592 		{"INT3515", },
1593 	/*
1594 	 * HIDs of device with an UartSerialBusV2 resource for which userspace
1595 	 * expects a regular tty cdev to be created (instead of the in kernel
1596 	 * serdev) and which have a kernel driver which expects a platform_dev
1597 	 * such as the rfkill-gpio driver.
1598 	 */
1599 		{"BCM4752", },
1600 		{"LNV4752", },
1601 		{}
1602 	};
1603 
1604 	if (acpi_is_indirect_io_slave(device))
1605 		return true;
1606 
1607 	/* Macs use device properties in lieu of _CRS resources */
1608 	if (x86_apple_machine &&
1609 	    (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1610 	     fwnode_property_present(&device->fwnode, "i2cAddress") ||
1611 	     fwnode_property_present(&device->fwnode, "baud")))
1612 		return true;
1613 
1614 	if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
1615 		return false;
1616 
1617 	INIT_LIST_HEAD(&resource_list);
1618 	acpi_dev_get_resources(device, &resource_list,
1619 			       acpi_check_serial_bus_slave,
1620 			       &is_serial_bus_slave);
1621 	acpi_dev_free_resource_list(&resource_list);
1622 
1623 	return is_serial_bus_slave;
1624 }
1625 
acpi_init_device_object(struct acpi_device * device,acpi_handle handle,int type,unsigned long long sta)1626 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1627 			     int type, unsigned long long sta)
1628 {
1629 	INIT_LIST_HEAD(&device->pnp.ids);
1630 	device->device_type = type;
1631 	device->handle = handle;
1632 	device->parent = acpi_bus_get_parent(handle);
1633 	fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1634 	acpi_set_device_status(device, sta);
1635 	acpi_device_get_busid(device);
1636 	acpi_set_pnp_ids(handle, &device->pnp, type);
1637 	acpi_init_properties(device);
1638 	acpi_bus_get_flags(device);
1639 	device->flags.match_driver = false;
1640 	device->flags.initialized = true;
1641 	device->flags.enumeration_by_parent =
1642 		acpi_device_enumeration_by_parent(device);
1643 	acpi_device_clear_enumerated(device);
1644 	device_initialize(&device->dev);
1645 	dev_set_uevent_suppress(&device->dev, true);
1646 	acpi_init_coherency(device);
1647 	/* Assume there are unmet deps until acpi_device_dep_initialize() runs */
1648 	device->dep_unmet = 1;
1649 }
1650 
acpi_device_add_finalize(struct acpi_device * device)1651 void acpi_device_add_finalize(struct acpi_device *device)
1652 {
1653 	dev_set_uevent_suppress(&device->dev, false);
1654 	kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1655 }
1656 
acpi_add_single_object(struct acpi_device ** child,acpi_handle handle,int type,unsigned long long sta)1657 static int acpi_add_single_object(struct acpi_device **child,
1658 				  acpi_handle handle, int type,
1659 				  unsigned long long sta)
1660 {
1661 	int result;
1662 	struct acpi_device *device;
1663 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1664 
1665 	device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1666 	if (!device) {
1667 		printk(KERN_ERR PREFIX "Memory allocation error\n");
1668 		return -ENOMEM;
1669 	}
1670 
1671 	acpi_init_device_object(device, handle, type, sta);
1672 	/*
1673 	 * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
1674 	 * that we can call acpi_bus_get_status() and use its quirk handling.
1675 	 * Note this must be done before the get power-/wakeup_dev-flags calls.
1676 	 */
1677 	if (type == ACPI_BUS_TYPE_DEVICE)
1678 		if (acpi_bus_get_status(device) < 0)
1679 			acpi_set_device_status(device, 0);
1680 
1681 	acpi_bus_get_power_flags(device);
1682 	acpi_bus_get_wakeup_device_flags(device);
1683 
1684 	result = acpi_device_add(device, acpi_device_release);
1685 	if (result) {
1686 		acpi_device_release(&device->dev);
1687 		return result;
1688 	}
1689 
1690 	acpi_power_add_remove_device(device, true);
1691 	acpi_device_add_finalize(device);
1692 	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1693 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1694 		dev_name(&device->dev), (char *) buffer.pointer,
1695 		device->parent ? dev_name(&device->parent->dev) : "(null)"));
1696 	kfree(buffer.pointer);
1697 	*child = device;
1698 	return 0;
1699 }
1700 
acpi_get_resource_memory(struct acpi_resource * ares,void * context)1701 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1702 					    void *context)
1703 {
1704 	struct resource *res = context;
1705 
1706 	if (acpi_dev_resource_memory(ares, res))
1707 		return AE_CTRL_TERMINATE;
1708 
1709 	return AE_OK;
1710 }
1711 
acpi_device_should_be_hidden(acpi_handle handle)1712 static bool acpi_device_should_be_hidden(acpi_handle handle)
1713 {
1714 	acpi_status status;
1715 	struct resource res;
1716 
1717 	/* Check if it should ignore the UART device */
1718 	if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1719 		return false;
1720 
1721 	/*
1722 	 * The UART device described in SPCR table is assumed to have only one
1723 	 * memory resource present. So we only look for the first one here.
1724 	 */
1725 	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1726 				     acpi_get_resource_memory, &res);
1727 	if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1728 		return false;
1729 
1730 	acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1731 			 &res.start);
1732 
1733 	return true;
1734 }
1735 
acpi_bus_type_and_status(acpi_handle handle,int * type,unsigned long long * sta)1736 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1737 				    unsigned long long *sta)
1738 {
1739 	acpi_status status;
1740 	acpi_object_type acpi_type;
1741 
1742 	status = acpi_get_type(handle, &acpi_type);
1743 	if (ACPI_FAILURE(status))
1744 		return -ENODEV;
1745 
1746 	switch (acpi_type) {
1747 	case ACPI_TYPE_ANY:		/* for ACPI_ROOT_OBJECT */
1748 	case ACPI_TYPE_DEVICE:
1749 		if (acpi_device_should_be_hidden(handle))
1750 			return -ENODEV;
1751 
1752 		*type = ACPI_BUS_TYPE_DEVICE;
1753 		/*
1754 		 * acpi_add_single_object updates this once we've an acpi_device
1755 		 * so that acpi_bus_get_status' quirk handling can be used.
1756 		 */
1757 		*sta = ACPI_STA_DEFAULT;
1758 		break;
1759 	case ACPI_TYPE_PROCESSOR:
1760 		*type = ACPI_BUS_TYPE_PROCESSOR;
1761 		status = acpi_bus_get_status_handle(handle, sta);
1762 		if (ACPI_FAILURE(status))
1763 			return -ENODEV;
1764 		break;
1765 	case ACPI_TYPE_THERMAL:
1766 		*type = ACPI_BUS_TYPE_THERMAL;
1767 		*sta = ACPI_STA_DEFAULT;
1768 		break;
1769 	case ACPI_TYPE_POWER:
1770 		*type = ACPI_BUS_TYPE_POWER;
1771 		*sta = ACPI_STA_DEFAULT;
1772 		break;
1773 	default:
1774 		return -ENODEV;
1775 	}
1776 
1777 	return 0;
1778 }
1779 
acpi_device_is_present(const struct acpi_device * adev)1780 bool acpi_device_is_present(const struct acpi_device *adev)
1781 {
1782 	return adev->status.present || adev->status.functional;
1783 }
1784 
acpi_scan_handler_matching(struct acpi_scan_handler * handler,const char * idstr,const struct acpi_device_id ** matchid)1785 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1786 				       const char *idstr,
1787 				       const struct acpi_device_id **matchid)
1788 {
1789 	const struct acpi_device_id *devid;
1790 
1791 	if (handler->match)
1792 		return handler->match(idstr, matchid);
1793 
1794 	for (devid = handler->ids; devid->id[0]; devid++)
1795 		if (!strcmp((char *)devid->id, idstr)) {
1796 			if (matchid)
1797 				*matchid = devid;
1798 
1799 			return true;
1800 		}
1801 
1802 	return false;
1803 }
1804 
acpi_scan_match_handler(const char * idstr,const struct acpi_device_id ** matchid)1805 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1806 					const struct acpi_device_id **matchid)
1807 {
1808 	struct acpi_scan_handler *handler;
1809 
1810 	list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1811 		if (acpi_scan_handler_matching(handler, idstr, matchid))
1812 			return handler;
1813 
1814 	return NULL;
1815 }
1816 
acpi_scan_hotplug_enabled(struct acpi_hotplug_profile * hotplug,bool val)1817 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1818 {
1819 	if (!!hotplug->enabled == !!val)
1820 		return;
1821 
1822 	mutex_lock(&acpi_scan_lock);
1823 
1824 	hotplug->enabled = val;
1825 
1826 	mutex_unlock(&acpi_scan_lock);
1827 }
1828 
acpi_scan_init_hotplug(struct acpi_device * adev)1829 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1830 {
1831 	struct acpi_hardware_id *hwid;
1832 
1833 	if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1834 		acpi_dock_add(adev);
1835 		return;
1836 	}
1837 	list_for_each_entry(hwid, &adev->pnp.ids, list) {
1838 		struct acpi_scan_handler *handler;
1839 
1840 		handler = acpi_scan_match_handler(hwid->id, NULL);
1841 		if (handler) {
1842 			adev->flags.hotplug_notify = true;
1843 			break;
1844 		}
1845 	}
1846 }
1847 
acpi_device_dep_initialize(struct acpi_device * adev)1848 static void acpi_device_dep_initialize(struct acpi_device *adev)
1849 {
1850 	struct acpi_dep_data *dep;
1851 	struct acpi_handle_list dep_devices;
1852 	acpi_status status;
1853 	int i;
1854 
1855 	adev->dep_unmet = 0;
1856 
1857 	if (!acpi_has_method(adev->handle, "_DEP"))
1858 		return;
1859 
1860 	status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1861 					&dep_devices);
1862 	if (ACPI_FAILURE(status)) {
1863 		dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1864 		return;
1865 	}
1866 
1867 	for (i = 0; i < dep_devices.count; i++) {
1868 		struct acpi_device_info *info;
1869 		int skip;
1870 
1871 		status = acpi_get_object_info(dep_devices.handles[i], &info);
1872 		if (ACPI_FAILURE(status)) {
1873 			dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1874 			continue;
1875 		}
1876 
1877 		/*
1878 		 * Skip the dependency of Windows System Power
1879 		 * Management Controller
1880 		 */
1881 		skip = info->valid & ACPI_VALID_HID &&
1882 			!strcmp(info->hardware_id.string, "INT3396");
1883 
1884 		kfree(info);
1885 
1886 		if (skip)
1887 			continue;
1888 
1889 		dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1890 		if (!dep)
1891 			return;
1892 
1893 		dep->master = dep_devices.handles[i];
1894 		dep->slave  = adev->handle;
1895 		adev->dep_unmet++;
1896 
1897 		mutex_lock(&acpi_dep_list_lock);
1898 		list_add_tail(&dep->node , &acpi_dep_list);
1899 		mutex_unlock(&acpi_dep_list_lock);
1900 	}
1901 }
1902 
acpi_bus_check_add(acpi_handle handle,u32 lvl_not_used,void * not_used,void ** return_value)1903 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1904 				      void *not_used, void **return_value)
1905 {
1906 	struct acpi_device *device = NULL;
1907 	int type;
1908 	unsigned long long sta;
1909 	int result;
1910 
1911 	acpi_bus_get_device(handle, &device);
1912 	if (device)
1913 		goto out;
1914 
1915 	result = acpi_bus_type_and_status(handle, &type, &sta);
1916 	if (result)
1917 		return AE_OK;
1918 
1919 	if (type == ACPI_BUS_TYPE_POWER) {
1920 		acpi_add_power_resource(handle);
1921 		return AE_OK;
1922 	}
1923 
1924 	acpi_add_single_object(&device, handle, type, sta);
1925 	if (!device)
1926 		return AE_CTRL_DEPTH;
1927 
1928 	acpi_scan_init_hotplug(device);
1929 	acpi_device_dep_initialize(device);
1930 
1931  out:
1932 	if (!*return_value)
1933 		*return_value = device;
1934 
1935 	return AE_OK;
1936 }
1937 
acpi_default_enumeration(struct acpi_device * device)1938 static void acpi_default_enumeration(struct acpi_device *device)
1939 {
1940 	/*
1941 	 * Do not enumerate devices with enumeration_by_parent flag set as
1942 	 * they will be enumerated by their respective parents.
1943 	 */
1944 	if (!device->flags.enumeration_by_parent) {
1945 		acpi_create_platform_device(device, NULL);
1946 		acpi_device_set_enumerated(device);
1947 	} else {
1948 		blocking_notifier_call_chain(&acpi_reconfig_chain,
1949 					     ACPI_RECONFIG_DEVICE_ADD, device);
1950 	}
1951 }
1952 
1953 static const struct acpi_device_id generic_device_ids[] = {
1954 	{ACPI_DT_NAMESPACE_HID, },
1955 	{"", },
1956 };
1957 
acpi_generic_device_attach(struct acpi_device * adev,const struct acpi_device_id * not_used)1958 static int acpi_generic_device_attach(struct acpi_device *adev,
1959 				      const struct acpi_device_id *not_used)
1960 {
1961 	/*
1962 	 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1963 	 * below can be unconditional.
1964 	 */
1965 	if (adev->data.of_compatible)
1966 		acpi_default_enumeration(adev);
1967 
1968 	return 1;
1969 }
1970 
1971 static struct acpi_scan_handler generic_device_handler = {
1972 	.ids = generic_device_ids,
1973 	.attach = acpi_generic_device_attach,
1974 };
1975 
acpi_scan_attach_handler(struct acpi_device * device)1976 static int acpi_scan_attach_handler(struct acpi_device *device)
1977 {
1978 	struct acpi_hardware_id *hwid;
1979 	int ret = 0;
1980 
1981 	list_for_each_entry(hwid, &device->pnp.ids, list) {
1982 		const struct acpi_device_id *devid;
1983 		struct acpi_scan_handler *handler;
1984 
1985 		handler = acpi_scan_match_handler(hwid->id, &devid);
1986 		if (handler) {
1987 			if (!handler->attach) {
1988 				device->pnp.type.platform_id = 0;
1989 				continue;
1990 			}
1991 			device->handler = handler;
1992 			ret = handler->attach(device, devid);
1993 			if (ret > 0)
1994 				break;
1995 
1996 			device->handler = NULL;
1997 			if (ret < 0)
1998 				break;
1999 		}
2000 	}
2001 
2002 	return ret;
2003 }
2004 
acpi_bus_attach(struct acpi_device * device)2005 static void acpi_bus_attach(struct acpi_device *device)
2006 {
2007 	struct acpi_device *child;
2008 	acpi_handle ejd;
2009 	int ret;
2010 
2011 	if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2012 		register_dock_dependent_device(device, ejd);
2013 
2014 	acpi_bus_get_status(device);
2015 	/* Skip devices that are not present. */
2016 	if (!acpi_device_is_present(device)) {
2017 		device->flags.initialized = false;
2018 		acpi_device_clear_enumerated(device);
2019 		device->flags.power_manageable = 0;
2020 		return;
2021 	}
2022 	if (device->handler)
2023 		goto ok;
2024 
2025 	if (!device->flags.initialized) {
2026 		device->flags.power_manageable =
2027 			device->power.states[ACPI_STATE_D0].flags.valid;
2028 		if (acpi_bus_init_power(device))
2029 			device->flags.power_manageable = 0;
2030 
2031 		device->flags.initialized = true;
2032 	} else if (device->flags.visited) {
2033 		goto ok;
2034 	}
2035 
2036 	ret = acpi_scan_attach_handler(device);
2037 	if (ret < 0)
2038 		return;
2039 
2040 	device->flags.match_driver = true;
2041 	if (ret > 0 && !device->flags.enumeration_by_parent) {
2042 		acpi_device_set_enumerated(device);
2043 		goto ok;
2044 	}
2045 
2046 	ret = device_attach(&device->dev);
2047 	if (ret < 0)
2048 		return;
2049 
2050 	if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2051 		acpi_default_enumeration(device);
2052 	else
2053 		acpi_device_set_enumerated(device);
2054 
2055  ok:
2056 	list_for_each_entry(child, &device->children, node)
2057 		acpi_bus_attach(child);
2058 
2059 	if (device->handler && device->handler->hotplug.notify_online)
2060 		device->handler->hotplug.notify_online(device);
2061 }
2062 
acpi_walk_dep_device_list(acpi_handle handle)2063 void acpi_walk_dep_device_list(acpi_handle handle)
2064 {
2065 	struct acpi_dep_data *dep, *tmp;
2066 	struct acpi_device *adev;
2067 
2068 	mutex_lock(&acpi_dep_list_lock);
2069 	list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2070 		if (dep->master == handle) {
2071 			acpi_bus_get_device(dep->slave, &adev);
2072 			if (!adev)
2073 				continue;
2074 
2075 			adev->dep_unmet--;
2076 			if (!adev->dep_unmet)
2077 				acpi_bus_attach(adev);
2078 			list_del(&dep->node);
2079 			kfree(dep);
2080 		}
2081 	}
2082 	mutex_unlock(&acpi_dep_list_lock);
2083 }
2084 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2085 
2086 /**
2087  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2088  * @handle: Root of the namespace scope to scan.
2089  *
2090  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2091  * found devices.
2092  *
2093  * If no devices were found, -ENODEV is returned, but it does not mean that
2094  * there has been a real error.  There just have been no suitable ACPI objects
2095  * in the table trunk from which the kernel could create a device and add an
2096  * appropriate driver.
2097  *
2098  * Must be called under acpi_scan_lock.
2099  */
acpi_bus_scan(acpi_handle handle)2100 int acpi_bus_scan(acpi_handle handle)
2101 {
2102 	void *device = NULL;
2103 
2104 	if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2105 		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2106 				    acpi_bus_check_add, NULL, NULL, &device);
2107 
2108 	if (device) {
2109 		acpi_bus_attach(device);
2110 		return 0;
2111 	}
2112 	return -ENODEV;
2113 }
2114 EXPORT_SYMBOL(acpi_bus_scan);
2115 
2116 /**
2117  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2118  * @adev: Root of the ACPI namespace scope to walk.
2119  *
2120  * Must be called under acpi_scan_lock.
2121  */
acpi_bus_trim(struct acpi_device * adev)2122 void acpi_bus_trim(struct acpi_device *adev)
2123 {
2124 	struct acpi_scan_handler *handler = adev->handler;
2125 	struct acpi_device *child;
2126 
2127 	list_for_each_entry_reverse(child, &adev->children, node)
2128 		acpi_bus_trim(child);
2129 
2130 	adev->flags.match_driver = false;
2131 	if (handler) {
2132 		if (handler->detach)
2133 			handler->detach(adev);
2134 
2135 		adev->handler = NULL;
2136 	} else {
2137 		device_release_driver(&adev->dev);
2138 	}
2139 	/*
2140 	 * Most likely, the device is going away, so put it into D3cold before
2141 	 * that.
2142 	 */
2143 	acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2144 	adev->flags.initialized = false;
2145 	acpi_device_clear_enumerated(adev);
2146 }
2147 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2148 
acpi_bus_register_early_device(int type)2149 int acpi_bus_register_early_device(int type)
2150 {
2151 	struct acpi_device *device = NULL;
2152 	int result;
2153 
2154 	result = acpi_add_single_object(&device, NULL,
2155 					type, ACPI_STA_DEFAULT);
2156 	if (result)
2157 		return result;
2158 
2159 	device->flags.match_driver = true;
2160 	return device_attach(&device->dev);
2161 }
2162 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2163 
acpi_bus_scan_fixed(void)2164 static int acpi_bus_scan_fixed(void)
2165 {
2166 	int result = 0;
2167 
2168 	/*
2169 	 * Enumerate all fixed-feature devices.
2170 	 */
2171 	if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2172 		struct acpi_device *device = NULL;
2173 
2174 		result = acpi_add_single_object(&device, NULL,
2175 						ACPI_BUS_TYPE_POWER_BUTTON,
2176 						ACPI_STA_DEFAULT);
2177 		if (result)
2178 			return result;
2179 
2180 		device->flags.match_driver = true;
2181 		result = device_attach(&device->dev);
2182 		if (result < 0)
2183 			return result;
2184 
2185 		device_init_wakeup(&device->dev, true);
2186 	}
2187 
2188 	if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2189 		struct acpi_device *device = NULL;
2190 
2191 		result = acpi_add_single_object(&device, NULL,
2192 						ACPI_BUS_TYPE_SLEEP_BUTTON,
2193 						ACPI_STA_DEFAULT);
2194 		if (result)
2195 			return result;
2196 
2197 		device->flags.match_driver = true;
2198 		result = device_attach(&device->dev);
2199 	}
2200 
2201 	return result < 0 ? result : 0;
2202 }
2203 
acpi_get_spcr_uart_addr(void)2204 static void __init acpi_get_spcr_uart_addr(void)
2205 {
2206 	acpi_status status;
2207 	struct acpi_table_spcr *spcr_ptr;
2208 
2209 	status = acpi_get_table(ACPI_SIG_SPCR, 0,
2210 				(struct acpi_table_header **)&spcr_ptr);
2211 	if (ACPI_FAILURE(status)) {
2212 		pr_warn(PREFIX "STAO table present, but SPCR is missing\n");
2213 		return;
2214 	}
2215 
2216 	spcr_uart_addr = spcr_ptr->serial_port.address;
2217 	acpi_put_table((struct acpi_table_header *)spcr_ptr);
2218 }
2219 
2220 static bool acpi_scan_initialized;
2221 
acpi_scan_init(void)2222 int __init acpi_scan_init(void)
2223 {
2224 	int result;
2225 	acpi_status status;
2226 	struct acpi_table_stao *stao_ptr;
2227 
2228 	acpi_pci_root_init();
2229 	acpi_pci_link_init();
2230 	acpi_processor_init();
2231 	acpi_platform_init();
2232 	acpi_lpss_init();
2233 	acpi_apd_init();
2234 	acpi_cmos_rtc_init();
2235 	acpi_container_init();
2236 	acpi_memory_hotplug_init();
2237 	acpi_watchdog_init();
2238 	acpi_pnp_init();
2239 	acpi_int340x_thermal_init();
2240 	acpi_amba_init();
2241 	acpi_init_lpit();
2242 
2243 	acpi_scan_add_handler(&generic_device_handler);
2244 
2245 	/*
2246 	 * If there is STAO table, check whether it needs to ignore the UART
2247 	 * device in SPCR table.
2248 	 */
2249 	status = acpi_get_table(ACPI_SIG_STAO, 0,
2250 				(struct acpi_table_header **)&stao_ptr);
2251 	if (ACPI_SUCCESS(status)) {
2252 		if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2253 			pr_info(PREFIX "STAO Name List not yet supported.\n");
2254 
2255 		if (stao_ptr->ignore_uart)
2256 			acpi_get_spcr_uart_addr();
2257 
2258 		acpi_put_table((struct acpi_table_header *)stao_ptr);
2259 	}
2260 
2261 	acpi_gpe_apply_masked_gpes();
2262 	acpi_update_all_gpes();
2263 
2264 	/*
2265 	 * Although we call __add_memory() that is documented to require the
2266 	 * device_hotplug_lock, it is not necessary here because this is an
2267 	 * early code when userspace or any other code path cannot trigger
2268 	 * hotplug/hotunplug operations.
2269 	 */
2270 	mutex_lock(&acpi_scan_lock);
2271 	/*
2272 	 * Enumerate devices in the ACPI namespace.
2273 	 */
2274 	result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2275 	if (result)
2276 		goto out;
2277 
2278 	result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2279 	if (result)
2280 		goto out;
2281 
2282 	/* Fixed feature devices do not exist on HW-reduced platform */
2283 	if (!acpi_gbl_reduced_hardware) {
2284 		result = acpi_bus_scan_fixed();
2285 		if (result) {
2286 			acpi_detach_data(acpi_root->handle,
2287 					 acpi_scan_drop_device);
2288 			acpi_device_del(acpi_root);
2289 			put_device(&acpi_root->dev);
2290 			goto out;
2291 		}
2292 	}
2293 
2294 	acpi_scan_initialized = true;
2295 
2296  out:
2297 	mutex_unlock(&acpi_scan_lock);
2298 	return result;
2299 }
2300 
2301 static struct acpi_probe_entry *ape;
2302 static int acpi_probe_count;
2303 static DEFINE_MUTEX(acpi_probe_mutex);
2304 
acpi_match_madt(union acpi_subtable_headers * header,const unsigned long end)2305 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2306 				  const unsigned long end)
2307 {
2308 	if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2309 		if (!ape->probe_subtbl(header, end))
2310 			acpi_probe_count++;
2311 
2312 	return 0;
2313 }
2314 
__acpi_probe_device_table(struct acpi_probe_entry * ap_head,int nr)2315 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2316 {
2317 	int count = 0;
2318 
2319 	if (acpi_disabled)
2320 		return 0;
2321 
2322 	mutex_lock(&acpi_probe_mutex);
2323 	for (ape = ap_head; nr; ape++, nr--) {
2324 		if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2325 			acpi_probe_count = 0;
2326 			acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2327 			count += acpi_probe_count;
2328 		} else {
2329 			int res;
2330 			res = acpi_table_parse(ape->id, ape->probe_table);
2331 			if (!res)
2332 				count++;
2333 		}
2334 	}
2335 	mutex_unlock(&acpi_probe_mutex);
2336 
2337 	return count;
2338 }
2339 
2340 struct acpi_table_events_work {
2341 	struct work_struct work;
2342 	void *table;
2343 	u32 event;
2344 };
2345 
acpi_table_events_fn(struct work_struct * work)2346 static void acpi_table_events_fn(struct work_struct *work)
2347 {
2348 	struct acpi_table_events_work *tew;
2349 
2350 	tew = container_of(work, struct acpi_table_events_work, work);
2351 
2352 	if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2353 		acpi_scan_lock_acquire();
2354 		acpi_bus_scan(ACPI_ROOT_OBJECT);
2355 		acpi_scan_lock_release();
2356 	}
2357 
2358 	kfree(tew);
2359 }
2360 
acpi_scan_table_handler(u32 event,void * table,void * context)2361 void acpi_scan_table_handler(u32 event, void *table, void *context)
2362 {
2363 	struct acpi_table_events_work *tew;
2364 
2365 	if (!acpi_scan_initialized)
2366 		return;
2367 
2368 	if (event != ACPI_TABLE_EVENT_LOAD)
2369 		return;
2370 
2371 	tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2372 	if (!tew)
2373 		return;
2374 
2375 	INIT_WORK(&tew->work, acpi_table_events_fn);
2376 	tew->table = table;
2377 	tew->event = event;
2378 
2379 	schedule_work(&tew->work);
2380 }
2381 
acpi_reconfig_notifier_register(struct notifier_block * nb)2382 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2383 {
2384 	return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2385 }
2386 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2387 
acpi_reconfig_notifier_unregister(struct notifier_block * nb)2388 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2389 {
2390 	return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2391 }
2392 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);
2393