Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/drivers/acpi/scan.c

  1 /*
  2  * scan.c - support for transforming the ACPI namespace into individual objects
  3  */
  4 
  5 #include <linux/module.h>
  6 #include <linux/init.h>
  7 #include <linux/slab.h>
  8 #include <linux/kernel.h>
  9 #include <linux/acpi.h>
 10 #include <linux/acpi_iort.h>
 11 #include <linux/signal.h>
 12 #include <linux/kthread.h>
 13 #include <linux/dmi.h>
 14 #include <linux/nls.h>
 15 #include <linux/dma-mapping.h>
 16 
 17 #include <asm/pgtable.h>
 18 
 19 #include "internal.h"
 20 
 21 #define _COMPONENT              ACPI_BUS_COMPONENT
 22 ACPI_MODULE_NAME("scan");
 23 extern struct acpi_device *acpi_root;
 24 
 25 #define ACPI_BUS_CLASS                  "system_bus"
 26 #define ACPI_BUS_HID                    "LNXSYBUS"
 27 #define ACPI_BUS_DEVICE_NAME            "System Bus"
 28 
 29 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
 30 
 31 #define INVALID_ACPI_HANDLE     ((acpi_handle)empty_zero_page)
 32 
 33 /*
 34  * If set, devices will be hot-removed even if they cannot be put offline
 35  * gracefully (from the kernel's standpoint).
 36  */
 37 bool acpi_force_hot_remove;
 38 
 39 static const char *dummy_hid = "device";
 40 
 41 static LIST_HEAD(acpi_dep_list);
 42 static DEFINE_MUTEX(acpi_dep_list_lock);
 43 LIST_HEAD(acpi_bus_id_list);
 44 static DEFINE_MUTEX(acpi_scan_lock);
 45 static LIST_HEAD(acpi_scan_handlers_list);
 46 DEFINE_MUTEX(acpi_device_lock);
 47 LIST_HEAD(acpi_wakeup_device_list);
 48 static DEFINE_MUTEX(acpi_hp_context_lock);
 49 
 50 /*
 51  * The UART device described by the SPCR table is the only object which needs
 52  * special-casing. Everything else is covered by ACPI namespace paths in STAO
 53  * table.
 54  */
 55 static u64 spcr_uart_addr;
 56 
 57 struct acpi_dep_data {
 58         struct list_head node;
 59         acpi_handle master;
 60         acpi_handle slave;
 61 };
 62 
 63 void acpi_scan_lock_acquire(void)
 64 {
 65         mutex_lock(&acpi_scan_lock);
 66 }
 67 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
 68 
 69 void acpi_scan_lock_release(void)
 70 {
 71         mutex_unlock(&acpi_scan_lock);
 72 }
 73 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
 74 
 75 void acpi_lock_hp_context(void)
 76 {
 77         mutex_lock(&acpi_hp_context_lock);
 78 }
 79 
 80 void acpi_unlock_hp_context(void)
 81 {
 82         mutex_unlock(&acpi_hp_context_lock);
 83 }
 84 
 85 void acpi_initialize_hp_context(struct acpi_device *adev,
 86                                 struct acpi_hotplug_context *hp,
 87                                 int (*notify)(struct acpi_device *, u32),
 88                                 void (*uevent)(struct acpi_device *, u32))
 89 {
 90         acpi_lock_hp_context();
 91         hp->notify = notify;
 92         hp->uevent = uevent;
 93         acpi_set_hp_context(adev, hp);
 94         acpi_unlock_hp_context();
 95 }
 96 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
 97 
 98 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
 99 {
100         if (!handler)
101                 return -EINVAL;
102 
103         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
104         return 0;
105 }
106 
107 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
108                                        const char *hotplug_profile_name)
109 {
110         int error;
111 
112         error = acpi_scan_add_handler(handler);
113         if (error)
114                 return error;
115 
116         acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
117         return 0;
118 }
119 
120 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
121 {
122         struct acpi_device_physical_node *pn;
123         bool offline = true;
124 
125         /*
126          * acpi_container_offline() calls this for all of the container's
127          * children under the container's physical_node_lock lock.
128          */
129         mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
130 
131         list_for_each_entry(pn, &adev->physical_node_list, node)
132                 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
133                         if (uevent)
134                                 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
135 
136                         offline = false;
137                         break;
138                 }
139 
140         mutex_unlock(&adev->physical_node_lock);
141         return offline;
142 }
143 
144 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
145                                     void **ret_p)
146 {
147         struct acpi_device *device = NULL;
148         struct acpi_device_physical_node *pn;
149         bool second_pass = (bool)data;
150         acpi_status status = AE_OK;
151 
152         if (acpi_bus_get_device(handle, &device))
153                 return AE_OK;
154 
155         if (device->handler && !device->handler->hotplug.enabled) {
156                 *ret_p = &device->dev;
157                 return AE_SUPPORT;
158         }
159 
160         mutex_lock(&device->physical_node_lock);
161 
162         list_for_each_entry(pn, &device->physical_node_list, node) {
163                 int ret;
164 
165                 if (second_pass) {
166                         /* Skip devices offlined by the first pass. */
167                         if (pn->put_online)
168                                 continue;
169                 } else {
170                         pn->put_online = false;
171                 }
172                 ret = device_offline(pn->dev);
173                 if (acpi_force_hot_remove)
174                         continue;
175 
176                 if (ret >= 0) {
177                         pn->put_online = !ret;
178                 } else {
179                         *ret_p = pn->dev;
180                         if (second_pass) {
181                                 status = AE_ERROR;
182                                 break;
183                         }
184                 }
185         }
186 
187         mutex_unlock(&device->physical_node_lock);
188 
189         return status;
190 }
191 
192 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
193                                    void **ret_p)
194 {
195         struct acpi_device *device = NULL;
196         struct acpi_device_physical_node *pn;
197 
198         if (acpi_bus_get_device(handle, &device))
199                 return AE_OK;
200 
201         mutex_lock(&device->physical_node_lock);
202 
203         list_for_each_entry(pn, &device->physical_node_list, node)
204                 if (pn->put_online) {
205                         device_online(pn->dev);
206                         pn->put_online = false;
207                 }
208 
209         mutex_unlock(&device->physical_node_lock);
210 
211         return AE_OK;
212 }
213 
214 static int acpi_scan_try_to_offline(struct acpi_device *device)
215 {
216         acpi_handle handle = device->handle;
217         struct device *errdev = NULL;
218         acpi_status status;
219 
220         /*
221          * Carry out two passes here and ignore errors in the first pass,
222          * because if the devices in question are memory blocks and
223          * CONFIG_MEMCG is set, one of the blocks may hold data structures
224          * that the other blocks depend on, but it is not known in advance which
225          * block holds them.
226          *
227          * If the first pass is successful, the second one isn't needed, though.
228          */
229         status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
230                                      NULL, acpi_bus_offline, (void *)false,
231                                      (void **)&errdev);
232         if (status == AE_SUPPORT) {
233                 dev_warn(errdev, "Offline disabled.\n");
234                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
235                                     acpi_bus_online, NULL, NULL, NULL);
236                 return -EPERM;
237         }
238         acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
239         if (errdev) {
240                 errdev = NULL;
241                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
242                                     NULL, acpi_bus_offline, (void *)true,
243                                     (void **)&errdev);
244                 if (!errdev || acpi_force_hot_remove)
245                         acpi_bus_offline(handle, 0, (void *)true,
246                                          (void **)&errdev);
247 
248                 if (errdev && !acpi_force_hot_remove) {
249                         dev_warn(errdev, "Offline failed.\n");
250                         acpi_bus_online(handle, 0, NULL, NULL);
251                         acpi_walk_namespace(ACPI_TYPE_ANY, handle,
252                                             ACPI_UINT32_MAX, acpi_bus_online,
253                                             NULL, NULL, NULL);
254                         return -EBUSY;
255                 }
256         }
257         return 0;
258 }
259 
260 static int acpi_scan_hot_remove(struct acpi_device *device)
261 {
262         acpi_handle handle = device->handle;
263         unsigned long long sta;
264         acpi_status status;
265 
266         if (device->handler && device->handler->hotplug.demand_offline
267             && !acpi_force_hot_remove) {
268                 if (!acpi_scan_is_offline(device, true))
269                         return -EBUSY;
270         } else {
271                 int error = acpi_scan_try_to_offline(device);
272                 if (error)
273                         return error;
274         }
275 
276         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
277                 "Hot-removing device %s...\n", dev_name(&device->dev)));
278 
279         acpi_bus_trim(device);
280 
281         acpi_evaluate_lck(handle, 0);
282         /*
283          * TBD: _EJD support.
284          */
285         status = acpi_evaluate_ej0(handle);
286         if (status == AE_NOT_FOUND)
287                 return -ENODEV;
288         else if (ACPI_FAILURE(status))
289                 return -EIO;
290 
291         /*
292          * Verify if eject was indeed successful.  If not, log an error
293          * message.  No need to call _OST since _EJ0 call was made OK.
294          */
295         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
296         if (ACPI_FAILURE(status)) {
297                 acpi_handle_warn(handle,
298                         "Status check after eject failed (0x%x)\n", status);
299         } else if (sta & ACPI_STA_DEVICE_ENABLED) {
300                 acpi_handle_warn(handle,
301                         "Eject incomplete - status 0x%llx\n", sta);
302         }
303 
304         return 0;
305 }
306 
307 static int acpi_scan_device_not_present(struct acpi_device *adev)
308 {
309         if (!acpi_device_enumerated(adev)) {
310                 dev_warn(&adev->dev, "Still not present\n");
311                 return -EALREADY;
312         }
313         acpi_bus_trim(adev);
314         return 0;
315 }
316 
317 static int acpi_scan_device_check(struct acpi_device *adev)
318 {
319         int error;
320 
321         acpi_bus_get_status(adev);
322         if (adev->status.present || adev->status.functional) {
323                 /*
324                  * This function is only called for device objects for which
325                  * matching scan handlers exist.  The only situation in which
326                  * the scan handler is not attached to this device object yet
327                  * is when the device has just appeared (either it wasn't
328                  * present at all before or it was removed and then added
329                  * again).
330                  */
331                 if (adev->handler) {
332                         dev_warn(&adev->dev, "Already enumerated\n");
333                         return -EALREADY;
334                 }
335                 error = acpi_bus_scan(adev->handle);
336                 if (error) {
337                         dev_warn(&adev->dev, "Namespace scan failure\n");
338                         return error;
339                 }
340                 if (!adev->handler) {
341                         dev_warn(&adev->dev, "Enumeration failure\n");
342                         error = -ENODEV;
343                 }
344         } else {
345                 error = acpi_scan_device_not_present(adev);
346         }
347         return error;
348 }
349 
350 static int acpi_scan_bus_check(struct acpi_device *adev)
351 {
352         struct acpi_scan_handler *handler = adev->handler;
353         struct acpi_device *child;
354         int error;
355 
356         acpi_bus_get_status(adev);
357         if (!(adev->status.present || adev->status.functional)) {
358                 acpi_scan_device_not_present(adev);
359                 return 0;
360         }
361         if (handler && handler->hotplug.scan_dependent)
362                 return handler->hotplug.scan_dependent(adev);
363 
364         error = acpi_bus_scan(adev->handle);
365         if (error) {
366                 dev_warn(&adev->dev, "Namespace scan failure\n");
367                 return error;
368         }
369         list_for_each_entry(child, &adev->children, node) {
370                 error = acpi_scan_bus_check(child);
371                 if (error)
372                         return error;
373         }
374         return 0;
375 }
376 
377 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
378 {
379         switch (type) {
380         case ACPI_NOTIFY_BUS_CHECK:
381                 return acpi_scan_bus_check(adev);
382         case ACPI_NOTIFY_DEVICE_CHECK:
383                 return acpi_scan_device_check(adev);
384         case ACPI_NOTIFY_EJECT_REQUEST:
385         case ACPI_OST_EC_OSPM_EJECT:
386                 if (adev->handler && !adev->handler->hotplug.enabled) {
387                         dev_info(&adev->dev, "Eject disabled\n");
388                         return -EPERM;
389                 }
390                 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
391                                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
392                 return acpi_scan_hot_remove(adev);
393         }
394         return -EINVAL;
395 }
396 
397 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
398 {
399         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
400         int error = -ENODEV;
401 
402         lock_device_hotplug();
403         mutex_lock(&acpi_scan_lock);
404 
405         /*
406          * The device object's ACPI handle cannot become invalid as long as we
407          * are holding acpi_scan_lock, but it might have become invalid before
408          * that lock was acquired.
409          */
410         if (adev->handle == INVALID_ACPI_HANDLE)
411                 goto err_out;
412 
413         if (adev->flags.is_dock_station) {
414                 error = dock_notify(adev, src);
415         } else if (adev->flags.hotplug_notify) {
416                 error = acpi_generic_hotplug_event(adev, src);
417                 if (error == -EPERM) {
418                         ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
419                         goto err_out;
420                 }
421         } else {
422                 int (*notify)(struct acpi_device *, u32);
423 
424                 acpi_lock_hp_context();
425                 notify = adev->hp ? adev->hp->notify : NULL;
426                 acpi_unlock_hp_context();
427                 /*
428                  * There may be additional notify handlers for device objects
429                  * without the .event() callback, so ignore them here.
430                  */
431                 if (notify)
432                         error = notify(adev, src);
433                 else
434                         goto out;
435         }
436         if (!error)
437                 ost_code = ACPI_OST_SC_SUCCESS;
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 
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 
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 
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                         if (acpi_device_bus_id->instance_no > 0)
486                                 acpi_device_bus_id->instance_no--;
487                         else {
488                                 list_del(&acpi_device_bus_id->node);
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 
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  */
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 
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         status = acpi_get_data_full(handle, acpi_scan_drop_device,
589                                     (void **)device, callback);
590         if (ACPI_FAILURE(status) || !*device) {
591                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
592                                   handle));
593                 return -ENODEV;
594         }
595         return 0;
596 }
597 
598 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
599 {
600         return acpi_get_device_data(handle, device, NULL);
601 }
602 EXPORT_SYMBOL(acpi_bus_get_device);
603 
604 static void get_acpi_device(void *dev)
605 {
606         if (dev)
607                 get_device(&((struct acpi_device *)dev)->dev);
608 }
609 
610 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
611 {
612         struct acpi_device *adev = NULL;
613 
614         acpi_get_device_data(handle, &adev, get_acpi_device);
615         return adev;
616 }
617 
618 void acpi_bus_put_acpi_device(struct acpi_device *adev)
619 {
620         put_device(&adev->dev);
621 }
622 
623 int acpi_device_add(struct acpi_device *device,
624                     void (*release)(struct device *))
625 {
626         int result;
627         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
628         int found = 0;
629 
630         if (device->handle) {
631                 acpi_status status;
632 
633                 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
634                                           device);
635                 if (ACPI_FAILURE(status)) {
636                         acpi_handle_err(device->handle,
637                                         "Unable to attach device data\n");
638                         return -ENODEV;
639                 }
640         }
641 
642         /*
643          * Linkage
644          * -------
645          * Link this device to its parent and siblings.
646          */
647         INIT_LIST_HEAD(&device->children);
648         INIT_LIST_HEAD(&device->node);
649         INIT_LIST_HEAD(&device->wakeup_list);
650         INIT_LIST_HEAD(&device->physical_node_list);
651         INIT_LIST_HEAD(&device->del_list);
652         mutex_init(&device->physical_node_lock);
653 
654         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
655         if (!new_bus_id) {
656                 pr_err(PREFIX "Memory allocation error\n");
657                 result = -ENOMEM;
658                 goto err_detach;
659         }
660 
661         mutex_lock(&acpi_device_lock);
662         /*
663          * Find suitable bus_id and instance number in acpi_bus_id_list
664          * If failed, create one and link it into acpi_bus_id_list
665          */
666         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
667                 if (!strcmp(acpi_device_bus_id->bus_id,
668                             acpi_device_hid(device))) {
669                         acpi_device_bus_id->instance_no++;
670                         found = 1;
671                         kfree(new_bus_id);
672                         break;
673                 }
674         }
675         if (!found) {
676                 acpi_device_bus_id = new_bus_id;
677                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
678                 acpi_device_bus_id->instance_no = 0;
679                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
680         }
681         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
682 
683         if (device->parent)
684                 list_add_tail(&device->node, &device->parent->children);
685 
686         if (device->wakeup.flags.valid)
687                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
688         mutex_unlock(&acpi_device_lock);
689 
690         if (device->parent)
691                 device->dev.parent = &device->parent->dev;
692         device->dev.bus = &acpi_bus_type;
693         device->dev.release = release;
694         result = device_add(&device->dev);
695         if (result) {
696                 dev_err(&device->dev, "Error registering device\n");
697                 goto err;
698         }
699 
700         result = acpi_device_setup_files(device);
701         if (result)
702                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
703                        dev_name(&device->dev));
704 
705         return 0;
706 
707  err:
708         mutex_lock(&acpi_device_lock);
709         if (device->parent)
710                 list_del(&device->node);
711         list_del(&device->wakeup_list);
712         mutex_unlock(&acpi_device_lock);
713 
714  err_detach:
715         acpi_detach_data(device->handle, acpi_scan_drop_device);
716         return result;
717 }
718 
719 /* --------------------------------------------------------------------------
720                                  Device Enumeration
721    -------------------------------------------------------------------------- */
722 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
723 {
724         struct acpi_device *device = NULL;
725         acpi_status status;
726 
727         /*
728          * Fixed hardware devices do not appear in the namespace and do not
729          * have handles, but we fabricate acpi_devices for them, so we have
730          * to deal with them specially.
731          */
732         if (!handle)
733                 return acpi_root;
734 
735         do {
736                 status = acpi_get_parent(handle, &handle);
737                 if (ACPI_FAILURE(status))
738                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
739         } while (acpi_bus_get_device(handle, &device));
740         return device;
741 }
742 
743 acpi_status
744 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
745 {
746         acpi_status status;
747         acpi_handle tmp;
748         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
749         union acpi_object *obj;
750 
751         status = acpi_get_handle(handle, "_EJD", &tmp);
752         if (ACPI_FAILURE(status))
753                 return status;
754 
755         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
756         if (ACPI_SUCCESS(status)) {
757                 obj = buffer.pointer;
758                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
759                                          ejd);
760                 kfree(buffer.pointer);
761         }
762         return status;
763 }
764 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
765 
766 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
767                                         struct acpi_device_wakeup *wakeup)
768 {
769         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
770         union acpi_object *package = NULL;
771         union acpi_object *element = NULL;
772         acpi_status status;
773         int err = -ENODATA;
774 
775         if (!wakeup)
776                 return -EINVAL;
777 
778         INIT_LIST_HEAD(&wakeup->resources);
779 
780         /* _PRW */
781         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
782         if (ACPI_FAILURE(status)) {
783                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
784                 return err;
785         }
786 
787         package = (union acpi_object *)buffer.pointer;
788 
789         if (!package || package->package.count < 2)
790                 goto out;
791 
792         element = &(package->package.elements[0]);
793         if (!element)
794                 goto out;
795 
796         if (element->type == ACPI_TYPE_PACKAGE) {
797                 if ((element->package.count < 2) ||
798                     (element->package.elements[0].type !=
799                      ACPI_TYPE_LOCAL_REFERENCE)
800                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
801                         goto out;
802 
803                 wakeup->gpe_device =
804                     element->package.elements[0].reference.handle;
805                 wakeup->gpe_number =
806                     (u32) element->package.elements[1].integer.value;
807         } else if (element->type == ACPI_TYPE_INTEGER) {
808                 wakeup->gpe_device = NULL;
809                 wakeup->gpe_number = element->integer.value;
810         } else {
811                 goto out;
812         }
813 
814         element = &(package->package.elements[1]);
815         if (element->type != ACPI_TYPE_INTEGER)
816                 goto out;
817 
818         wakeup->sleep_state = element->integer.value;
819 
820         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
821         if (err)
822                 goto out;
823 
824         if (!list_empty(&wakeup->resources)) {
825                 int sleep_state;
826 
827                 err = acpi_power_wakeup_list_init(&wakeup->resources,
828                                                   &sleep_state);
829                 if (err) {
830                         acpi_handle_warn(handle, "Retrieving current states "
831                                          "of wakeup power resources failed\n");
832                         acpi_power_resources_list_free(&wakeup->resources);
833                         goto out;
834                 }
835                 if (sleep_state < wakeup->sleep_state) {
836                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
837                                          "(S%d) by S%d from power resources\n",
838                                          (int)wakeup->sleep_state, sleep_state);
839                         wakeup->sleep_state = sleep_state;
840                 }
841         }
842 
843  out:
844         kfree(buffer.pointer);
845         return err;
846 }
847 
848 static void acpi_wakeup_gpe_init(struct acpi_device *device)
849 {
850         static const struct acpi_device_id button_device_ids[] = {
851                 {"PNP0C0C", 0},
852                 {"PNP0C0D", 0},
853                 {"PNP0C0E", 0},
854                 {"", 0},
855         };
856         struct acpi_device_wakeup *wakeup = &device->wakeup;
857         acpi_status status;
858         acpi_event_status event_status;
859 
860         wakeup->flags.notifier_present = 0;
861 
862         /* Power button, Lid switch always enable wakeup */
863         if (!acpi_match_device_ids(device, button_device_ids)) {
864                 wakeup->flags.run_wake = 1;
865                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
866                         /* Do not use Lid/sleep button for S5 wakeup */
867                         if (wakeup->sleep_state == ACPI_STATE_S5)
868                                 wakeup->sleep_state = ACPI_STATE_S4;
869                 }
870                 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
871                 device_set_wakeup_capable(&device->dev, true);
872                 return;
873         }
874 
875         acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
876                                 wakeup->gpe_number);
877         status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
878                                      &event_status);
879         if (ACPI_FAILURE(status))
880                 return;
881 
882         wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
883 }
884 
885 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
886 {
887         int err;
888 
889         /* Presence of _PRW indicates wake capable */
890         if (!acpi_has_method(device->handle, "_PRW"))
891                 return;
892 
893         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
894                                                            &device->wakeup);
895         if (err) {
896                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
897                 return;
898         }
899 
900         device->wakeup.flags.valid = 1;
901         device->wakeup.prepare_count = 0;
902         acpi_wakeup_gpe_init(device);
903         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
904          * system for the ACPI device with the _PRW object.
905          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
906          * So it is necessary to call _DSW object first. Only when it is not
907          * present will the _PSW object used.
908          */
909         err = acpi_device_sleep_wake(device, 0, 0, 0);
910         if (err)
911                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
912                                 "error in _DSW or _PSW evaluation\n"));
913 }
914 
915 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
916 {
917         struct acpi_device_power_state *ps = &device->power.states[state];
918         char pathname[5] = { '_', 'P', 'R', '' + state, '\0' };
919         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
920         acpi_status status;
921 
922         INIT_LIST_HEAD(&ps->resources);
923 
924         /* Evaluate "_PRx" to get referenced power resources */
925         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
926         if (ACPI_SUCCESS(status)) {
927                 union acpi_object *package = buffer.pointer;
928 
929                 if (buffer.length && package
930                     && package->type == ACPI_TYPE_PACKAGE
931                     && package->package.count) {
932                         int err = acpi_extract_power_resources(package, 0,
933                                                                &ps->resources);
934                         if (!err)
935                                 device->power.flags.power_resources = 1;
936                 }
937                 ACPI_FREE(buffer.pointer);
938         }
939 
940         /* Evaluate "_PSx" to see if we can do explicit sets */
941         pathname[2] = 'S';
942         if (acpi_has_method(device->handle, pathname))
943                 ps->flags.explicit_set = 1;
944 
945         /* State is valid if there are means to put the device into it. */
946         if (!list_empty(&ps->resources) || ps->flags.explicit_set)
947                 ps->flags.valid = 1;
948 
949         ps->power = -1;         /* Unknown - driver assigned */
950         ps->latency = -1;       /* Unknown - driver assigned */
951 }
952 
953 static void acpi_bus_get_power_flags(struct acpi_device *device)
954 {
955         u32 i;
956 
957         /* Presence of _PS0|_PR0 indicates 'power manageable' */
958         if (!acpi_has_method(device->handle, "_PS0") &&
959             !acpi_has_method(device->handle, "_PR0"))
960                 return;
961 
962         device->flags.power_manageable = 1;
963 
964         /*
965          * Power Management Flags
966          */
967         if (acpi_has_method(device->handle, "_PSC"))
968                 device->power.flags.explicit_get = 1;
969 
970         if (acpi_has_method(device->handle, "_IRC"))
971                 device->power.flags.inrush_current = 1;
972 
973         if (acpi_has_method(device->handle, "_DSW"))
974                 device->power.flags.dsw_present = 1;
975 
976         /*
977          * Enumerate supported power management states
978          */
979         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
980                 acpi_bus_init_power_state(device, i);
981 
982         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
983         if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
984                 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
985 
986         /* Set defaults for D0 and D3hot states (always valid) */
987         device->power.states[ACPI_STATE_D0].flags.valid = 1;
988         device->power.states[ACPI_STATE_D0].power = 100;
989         device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
990 
991         if (acpi_bus_init_power(device))
992                 device->flags.power_manageable = 0;
993 }
994 
995 static void acpi_bus_get_flags(struct acpi_device *device)
996 {
997         /* Presence of _STA indicates 'dynamic_status' */
998         if (acpi_has_method(device->handle, "_STA"))
999                 device->flags.dynamic_status = 1;
1000 
1001         /* Presence of _RMV indicates 'removable' */
1002         if (acpi_has_method(device->handle, "_RMV"))
1003                 device->flags.removable = 1;
1004 
1005         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1006         if (acpi_has_method(device->handle, "_EJD") ||
1007             acpi_has_method(device->handle, "_EJ0"))
1008                 device->flags.ejectable = 1;
1009 }
1010 
1011 static void acpi_device_get_busid(struct acpi_device *device)
1012 {
1013         char bus_id[5] = { '?', 0 };
1014         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1015         int i = 0;
1016 
1017         /*
1018          * Bus ID
1019          * ------
1020          * The device's Bus ID is simply the object name.
1021          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1022          */
1023         if (ACPI_IS_ROOT_DEVICE(device)) {
1024                 strcpy(device->pnp.bus_id, "ACPI");
1025                 return;
1026         }
1027 
1028         switch (device->device_type) {
1029         case ACPI_BUS_TYPE_POWER_BUTTON:
1030                 strcpy(device->pnp.bus_id, "PWRF");
1031                 break;
1032         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1033                 strcpy(device->pnp.bus_id, "SLPF");
1034                 break;
1035         default:
1036                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1037                 /* Clean up trailing underscores (if any) */
1038                 for (i = 3; i > 1; i--) {
1039                         if (bus_id[i] == '_')
1040                                 bus_id[i] = '\0';
1041                         else
1042                                 break;
1043                 }
1044                 strcpy(device->pnp.bus_id, bus_id);
1045                 break;
1046         }
1047 }
1048 
1049 /*
1050  * acpi_ata_match - see if an acpi object is an ATA device
1051  *
1052  * If an acpi object has one of the ACPI ATA methods defined,
1053  * then we can safely call it an ATA device.
1054  */
1055 bool acpi_ata_match(acpi_handle handle)
1056 {
1057         return acpi_has_method(handle, "_GTF") ||
1058                acpi_has_method(handle, "_GTM") ||
1059                acpi_has_method(handle, "_STM") ||
1060                acpi_has_method(handle, "_SDD");
1061 }
1062 
1063 /*
1064  * acpi_bay_match - see if an acpi object is an ejectable driver bay
1065  *
1066  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1067  * then we can safely call it an ejectable drive bay
1068  */
1069 bool acpi_bay_match(acpi_handle handle)
1070 {
1071         acpi_handle phandle;
1072 
1073         if (!acpi_has_method(handle, "_EJ0"))
1074                 return false;
1075         if (acpi_ata_match(handle))
1076                 return true;
1077         if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1078                 return false;
1079 
1080         return acpi_ata_match(phandle);
1081 }
1082 
1083 bool acpi_device_is_battery(struct acpi_device *adev)
1084 {
1085         struct acpi_hardware_id *hwid;
1086 
1087         list_for_each_entry(hwid, &adev->pnp.ids, list)
1088                 if (!strcmp("PNP0C0A", hwid->id))
1089                         return true;
1090 
1091         return false;
1092 }
1093 
1094 static bool is_ejectable_bay(struct acpi_device *adev)
1095 {
1096         acpi_handle handle = adev->handle;
1097 
1098         if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1099                 return true;
1100 
1101         return acpi_bay_match(handle);
1102 }
1103 
1104 /*
1105  * acpi_dock_match - see if an acpi object has a _DCK method
1106  */
1107 bool acpi_dock_match(acpi_handle handle)
1108 {
1109         return acpi_has_method(handle, "_DCK");
1110 }
1111 
1112 static acpi_status
1113 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1114                           void **return_value)
1115 {
1116         long *cap = context;
1117 
1118         if (acpi_has_method(handle, "_BCM") &&
1119             acpi_has_method(handle, "_BCL")) {
1120                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1121                                   "support\n"));
1122                 *cap |= ACPI_VIDEO_BACKLIGHT;
1123                 /* We have backlight support, no need to scan further */
1124                 return AE_CTRL_TERMINATE;
1125         }
1126         return 0;
1127 }
1128 
1129 /* Returns true if the ACPI object is a video device which can be
1130  * handled by video.ko.
1131  * The device will get a Linux specific CID added in scan.c to
1132  * identify the device as an ACPI graphics device
1133  * Be aware that the graphics device may not be physically present
1134  * Use acpi_video_get_capabilities() to detect general ACPI video
1135  * capabilities of present cards
1136  */
1137 long acpi_is_video_device(acpi_handle handle)
1138 {
1139         long video_caps = 0;
1140 
1141         /* Is this device able to support video switching ? */
1142         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1143                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1144 
1145         /* Is this device able to retrieve a video ROM ? */
1146         if (acpi_has_method(handle, "_ROM"))
1147                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1148 
1149         /* Is this device able to configure which video head to be POSTed ? */
1150         if (acpi_has_method(handle, "_VPO") &&
1151             acpi_has_method(handle, "_GPD") &&
1152             acpi_has_method(handle, "_SPD"))
1153                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1154 
1155         /* Only check for backlight functionality if one of the above hit. */
1156         if (video_caps)
1157                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1158                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1159                                     &video_caps, NULL);
1160 
1161         return video_caps;
1162 }
1163 EXPORT_SYMBOL(acpi_is_video_device);
1164 
1165 const char *acpi_device_hid(struct acpi_device *device)
1166 {
1167         struct acpi_hardware_id *hid;
1168 
1169         if (list_empty(&device->pnp.ids))
1170                 return dummy_hid;
1171 
1172         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1173         return hid->id;
1174 }
1175 EXPORT_SYMBOL(acpi_device_hid);
1176 
1177 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1178 {
1179         struct acpi_hardware_id *id;
1180 
1181         id = kmalloc(sizeof(*id), GFP_KERNEL);
1182         if (!id)
1183                 return;
1184 
1185         id->id = kstrdup_const(dev_id, GFP_KERNEL);
1186         if (!id->id) {
1187                 kfree(id);
1188                 return;
1189         }
1190 
1191         list_add_tail(&id->list, &pnp->ids);
1192         pnp->type.hardware_id = 1;
1193 }
1194 
1195 /*
1196  * Old IBM workstations have a DSDT bug wherein the SMBus object
1197  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1198  * prefix.  Work around this.
1199  */
1200 static bool acpi_ibm_smbus_match(acpi_handle handle)
1201 {
1202         char node_name[ACPI_PATH_SEGMENT_LENGTH];
1203         struct acpi_buffer path = { sizeof(node_name), node_name };
1204 
1205         if (!dmi_name_in_vendors("IBM"))
1206                 return false;
1207 
1208         /* Look for SMBS object */
1209         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1210             strcmp("SMBS", path.pointer))
1211                 return false;
1212 
1213         /* Does it have the necessary (but misnamed) methods? */
1214         if (acpi_has_method(handle, "SBI") &&
1215             acpi_has_method(handle, "SBR") &&
1216             acpi_has_method(handle, "SBW"))
1217                 return true;
1218 
1219         return false;
1220 }
1221 
1222 static bool acpi_object_is_system_bus(acpi_handle handle)
1223 {
1224         acpi_handle tmp;
1225 
1226         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1227             tmp == handle)
1228                 return true;
1229         if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1230             tmp == handle)
1231                 return true;
1232 
1233         return false;
1234 }
1235 
1236 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1237                                 int device_type)
1238 {
1239         acpi_status status;
1240         struct acpi_device_info *info;
1241         struct acpi_pnp_device_id_list *cid_list;
1242         int i;
1243 
1244         switch (device_type) {
1245         case ACPI_BUS_TYPE_DEVICE:
1246                 if (handle == ACPI_ROOT_OBJECT) {
1247                         acpi_add_id(pnp, ACPI_SYSTEM_HID);
1248                         break;
1249                 }
1250 
1251                 status = acpi_get_object_info(handle, &info);
1252                 if (ACPI_FAILURE(status)) {
1253                         pr_err(PREFIX "%s: Error reading device info\n",
1254                                         __func__);
1255                         return;
1256                 }
1257 
1258                 if (info->valid & ACPI_VALID_HID) {
1259                         acpi_add_id(pnp, info->hardware_id.string);
1260                         pnp->type.platform_id = 1;
1261                 }
1262                 if (info->valid & ACPI_VALID_CID) {
1263                         cid_list = &info->compatible_id_list;
1264                         for (i = 0; i < cid_list->count; i++)
1265                                 acpi_add_id(pnp, cid_list->ids[i].string);
1266                 }
1267                 if (info->valid & ACPI_VALID_ADR) {
1268                         pnp->bus_address = info->address;
1269                         pnp->type.bus_address = 1;
1270                 }
1271                 if (info->valid & ACPI_VALID_UID)
1272                         pnp->unique_id = kstrdup(info->unique_id.string,
1273                                                         GFP_KERNEL);
1274                 if (info->valid & ACPI_VALID_CLS)
1275                         acpi_add_id(pnp, info->class_code.string);
1276 
1277                 kfree(info);
1278 
1279                 /*
1280                  * Some devices don't reliably have _HIDs & _CIDs, so add
1281                  * synthetic HIDs to make sure drivers can find them.
1282                  */
1283                 if (acpi_is_video_device(handle))
1284                         acpi_add_id(pnp, ACPI_VIDEO_HID);
1285                 else if (acpi_bay_match(handle))
1286                         acpi_add_id(pnp, ACPI_BAY_HID);
1287                 else if (acpi_dock_match(handle))
1288                         acpi_add_id(pnp, ACPI_DOCK_HID);
1289                 else if (acpi_ibm_smbus_match(handle))
1290                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1291                 else if (list_empty(&pnp->ids) &&
1292                          acpi_object_is_system_bus(handle)) {
1293                         /* \_SB, \_TZ, LNXSYBUS */
1294                         acpi_add_id(pnp, ACPI_BUS_HID);
1295                         strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1296                         strcpy(pnp->device_class, ACPI_BUS_CLASS);
1297                 }
1298 
1299                 break;
1300         case ACPI_BUS_TYPE_POWER:
1301                 acpi_add_id(pnp, ACPI_POWER_HID);
1302                 break;
1303         case ACPI_BUS_TYPE_PROCESSOR:
1304                 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1305                 break;
1306         case ACPI_BUS_TYPE_THERMAL:
1307                 acpi_add_id(pnp, ACPI_THERMAL_HID);
1308                 break;
1309         case ACPI_BUS_TYPE_POWER_BUTTON:
1310                 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1311                 break;
1312         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1313                 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1314                 break;
1315         }
1316 }
1317 
1318 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1319 {
1320         struct acpi_hardware_id *id, *tmp;
1321 
1322         list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1323                 kfree_const(id->id);
1324                 kfree(id);
1325         }
1326         kfree(pnp->unique_id);
1327 }
1328 
1329 /**
1330  * acpi_dma_supported - Check DMA support for the specified device.
1331  * @adev: The pointer to acpi device
1332  *
1333  * Return false if DMA is not supported. Otherwise, return true
1334  */
1335 bool acpi_dma_supported(struct acpi_device *adev)
1336 {
1337         if (!adev)
1338                 return false;
1339 
1340         if (adev->flags.cca_seen)
1341                 return true;
1342 
1343         /*
1344         * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1345         * DMA on "Intel platforms".  Presumably that includes all x86 and
1346         * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1347         */
1348         if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1349                 return true;
1350 
1351         return false;
1352 }
1353 
1354 /**
1355  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1356  * @adev: The pointer to acpi device
1357  *
1358  * Return enum dev_dma_attr.
1359  */
1360 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1361 {
1362         if (!acpi_dma_supported(adev))
1363                 return DEV_DMA_NOT_SUPPORTED;
1364 
1365         if (adev->flags.coherent_dma)
1366                 return DEV_DMA_COHERENT;
1367         else
1368                 return DEV_DMA_NON_COHERENT;
1369 }
1370 
1371 /**
1372  * acpi_dma_configure - Set-up DMA configuration for the device.
1373  * @dev: The pointer to the device
1374  * @attr: device dma attributes
1375  */
1376 void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
1377 {
1378         const struct iommu_ops *iommu;
1379 
1380         iort_set_dma_mask(dev);
1381 
1382         iommu = iort_iommu_configure(dev);
1383 
1384         /*
1385          * Assume dma valid range starts at 0 and covers the whole
1386          * coherent_dma_mask.
1387          */
1388         arch_setup_dma_ops(dev, 0, dev->coherent_dma_mask + 1, iommu,
1389                            attr == DEV_DMA_COHERENT);
1390 }
1391 EXPORT_SYMBOL_GPL(acpi_dma_configure);
1392 
1393 /**
1394  * acpi_dma_deconfigure - Tear-down DMA configuration for the device.
1395  * @dev: The pointer to the device
1396  */
1397 void acpi_dma_deconfigure(struct device *dev)
1398 {
1399         arch_teardown_dma_ops(dev);
1400 }
1401 EXPORT_SYMBOL_GPL(acpi_dma_deconfigure);
1402 
1403 static void acpi_init_coherency(struct acpi_device *adev)
1404 {
1405         unsigned long long cca = 0;
1406         acpi_status status;
1407         struct acpi_device *parent = adev->parent;
1408 
1409         if (parent && parent->flags.cca_seen) {
1410                 /*
1411                  * From ACPI spec, OSPM will ignore _CCA if an ancestor
1412                  * already saw one.
1413                  */
1414                 adev->flags.cca_seen = 1;
1415                 cca = parent->flags.coherent_dma;
1416         } else {
1417                 status = acpi_evaluate_integer(adev->handle, "_CCA",
1418                                                NULL, &cca);
1419                 if (ACPI_SUCCESS(status))
1420                         adev->flags.cca_seen = 1;
1421                 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1422                         /*
1423                          * If architecture does not specify that _CCA is
1424                          * required for DMA-able devices (e.g. x86),
1425                          * we default to _CCA=1.
1426                          */
1427                         cca = 1;
1428                 else
1429                         acpi_handle_debug(adev->handle,
1430                                           "ACPI device is missing _CCA.\n");
1431         }
1432 
1433         adev->flags.coherent_dma = cca;
1434 }
1435 
1436 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1437                              int type, unsigned long long sta)
1438 {
1439         INIT_LIST_HEAD(&device->pnp.ids);
1440         device->device_type = type;
1441         device->handle = handle;
1442         device->parent = acpi_bus_get_parent(handle);
1443         device->fwnode.type = FWNODE_ACPI;
1444         acpi_set_device_status(device, sta);
1445         acpi_device_get_busid(device);
1446         acpi_set_pnp_ids(handle, &device->pnp, type);
1447         acpi_init_properties(device);
1448         acpi_bus_get_flags(device);
1449         device->flags.match_driver = false;
1450         device->flags.initialized = true;
1451         acpi_device_clear_enumerated(device);
1452         device_initialize(&device->dev);
1453         dev_set_uevent_suppress(&device->dev, true);
1454         acpi_init_coherency(device);
1455 }
1456 
1457 void acpi_device_add_finalize(struct acpi_device *device)
1458 {
1459         dev_set_uevent_suppress(&device->dev, false);
1460         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1461 }
1462 
1463 static int acpi_add_single_object(struct acpi_device **child,
1464                                   acpi_handle handle, int type,
1465                                   unsigned long long sta)
1466 {
1467         int result;
1468         struct acpi_device *device;
1469         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1470 
1471         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1472         if (!device) {
1473                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1474                 return -ENOMEM;
1475         }
1476 
1477         acpi_init_device_object(device, handle, type, sta);
1478         acpi_bus_get_power_flags(device);
1479         acpi_bus_get_wakeup_device_flags(device);
1480 
1481         result = acpi_device_add(device, acpi_device_release);
1482         if (result) {
1483                 acpi_device_release(&device->dev);
1484                 return result;
1485         }
1486 
1487         acpi_power_add_remove_device(device, true);
1488         acpi_device_add_finalize(device);
1489         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1490         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1491                 dev_name(&device->dev), (char *) buffer.pointer,
1492                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1493         kfree(buffer.pointer);
1494         *child = device;
1495         return 0;
1496 }
1497 
1498 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1499                                             void *context)
1500 {
1501         struct resource *res = context;
1502 
1503         if (acpi_dev_resource_memory(ares, res))
1504                 return AE_CTRL_TERMINATE;
1505 
1506         return AE_OK;
1507 }
1508 
1509 static bool acpi_device_should_be_hidden(acpi_handle handle)
1510 {
1511         acpi_status status;
1512         struct resource res;
1513 
1514         /* Check if it should ignore the UART device */
1515         if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1516                 return false;
1517 
1518         /*
1519          * The UART device described in SPCR table is assumed to have only one
1520          * memory resource present. So we only look for the first one here.
1521          */
1522         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1523                                      acpi_get_resource_memory, &res);
1524         if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1525                 return false;
1526 
1527         acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1528                          &res.start);
1529 
1530         return true;
1531 }
1532 
1533 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1534                                     unsigned long long *sta)
1535 {
1536         acpi_status status;
1537         acpi_object_type acpi_type;
1538 
1539         status = acpi_get_type(handle, &acpi_type);
1540         if (ACPI_FAILURE(status))
1541                 return -ENODEV;
1542 
1543         switch (acpi_type) {
1544         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1545         case ACPI_TYPE_DEVICE:
1546                 if (acpi_device_should_be_hidden(handle))
1547                         return -ENODEV;
1548 
1549                 *type = ACPI_BUS_TYPE_DEVICE;
1550                 status = acpi_bus_get_status_handle(handle, sta);
1551                 if (ACPI_FAILURE(status))
1552                         *sta = 0;
1553                 break;
1554         case ACPI_TYPE_PROCESSOR:
1555                 *type = ACPI_BUS_TYPE_PROCESSOR;
1556                 status = acpi_bus_get_status_handle(handle, sta);
1557                 if (ACPI_FAILURE(status))
1558                         return -ENODEV;
1559                 break;
1560         case ACPI_TYPE_THERMAL:
1561                 *type = ACPI_BUS_TYPE_THERMAL;
1562                 *sta = ACPI_STA_DEFAULT;
1563                 break;
1564         case ACPI_TYPE_POWER:
1565                 *type = ACPI_BUS_TYPE_POWER;
1566                 *sta = ACPI_STA_DEFAULT;
1567                 break;
1568         default:
1569                 return -ENODEV;
1570         }
1571 
1572         return 0;
1573 }
1574 
1575 bool acpi_device_is_present(struct acpi_device *adev)
1576 {
1577         if (adev->status.present || adev->status.functional)
1578                 return true;
1579 
1580         adev->flags.initialized = false;
1581         return false;
1582 }
1583 
1584 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1585                                        const char *idstr,
1586                                        const struct acpi_device_id **matchid)
1587 {
1588         const struct acpi_device_id *devid;
1589 
1590         if (handler->match)
1591                 return handler->match(idstr, matchid);
1592 
1593         for (devid = handler->ids; devid->id[0]; devid++)
1594                 if (!strcmp((char *)devid->id, idstr)) {
1595                         if (matchid)
1596                                 *matchid = devid;
1597 
1598                         return true;
1599                 }
1600 
1601         return false;
1602 }
1603 
1604 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1605                                         const struct acpi_device_id **matchid)
1606 {
1607         struct acpi_scan_handler *handler;
1608 
1609         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1610                 if (acpi_scan_handler_matching(handler, idstr, matchid))
1611                         return handler;
1612 
1613         return NULL;
1614 }
1615 
1616 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1617 {
1618         if (!!hotplug->enabled == !!val)
1619                 return;
1620 
1621         mutex_lock(&acpi_scan_lock);
1622 
1623         hotplug->enabled = val;
1624 
1625         mutex_unlock(&acpi_scan_lock);
1626 }
1627 
1628 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1629 {
1630         struct acpi_hardware_id *hwid;
1631 
1632         if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1633                 acpi_dock_add(adev);
1634                 return;
1635         }
1636         list_for_each_entry(hwid, &adev->pnp.ids, list) {
1637                 struct acpi_scan_handler *handler;
1638 
1639                 handler = acpi_scan_match_handler(hwid->id, NULL);
1640                 if (handler) {
1641                         adev->flags.hotplug_notify = true;
1642                         break;
1643                 }
1644         }
1645 }
1646 
1647 static void acpi_device_dep_initialize(struct acpi_device *adev)
1648 {
1649         struct acpi_dep_data *dep;
1650         struct acpi_handle_list dep_devices;
1651         acpi_status status;
1652         int i;
1653 
1654         if (!acpi_has_method(adev->handle, "_DEP"))
1655                 return;
1656 
1657         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1658                                         &dep_devices);
1659         if (ACPI_FAILURE(status)) {
1660                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1661                 return;
1662         }
1663 
1664         for (i = 0; i < dep_devices.count; i++) {
1665                 struct acpi_device_info *info;
1666                 int skip;
1667 
1668                 status = acpi_get_object_info(dep_devices.handles[i], &info);
1669                 if (ACPI_FAILURE(status)) {
1670                         dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1671                         continue;
1672                 }
1673 
1674                 /*
1675                  * Skip the dependency of Windows System Power
1676                  * Management Controller
1677                  */
1678                 skip = info->valid & ACPI_VALID_HID &&
1679                         !strcmp(info->hardware_id.string, "INT3396");
1680 
1681                 kfree(info);
1682 
1683                 if (skip)
1684                         continue;
1685 
1686                 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1687                 if (!dep)
1688                         return;
1689 
1690                 dep->master = dep_devices.handles[i];
1691                 dep->slave  = adev->handle;
1692                 adev->dep_unmet++;
1693 
1694                 mutex_lock(&acpi_dep_list_lock);
1695                 list_add_tail(&dep->node , &acpi_dep_list);
1696                 mutex_unlock(&acpi_dep_list_lock);
1697         }
1698 }
1699 
1700 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1701                                       void *not_used, void **return_value)
1702 {
1703         struct acpi_device *device = NULL;
1704         int type;
1705         unsigned long long sta;
1706         int result;
1707 
1708         acpi_bus_get_device(handle, &device);
1709         if (device)
1710                 goto out;
1711 
1712         result = acpi_bus_type_and_status(handle, &type, &sta);
1713         if (result)
1714                 return AE_OK;
1715 
1716         if (type == ACPI_BUS_TYPE_POWER) {
1717                 acpi_add_power_resource(handle);
1718                 return AE_OK;
1719         }
1720 
1721         acpi_add_single_object(&device, handle, type, sta);
1722         if (!device)
1723                 return AE_CTRL_DEPTH;
1724 
1725         acpi_scan_init_hotplug(device);
1726         acpi_device_dep_initialize(device);
1727 
1728  out:
1729         if (!*return_value)
1730                 *return_value = device;
1731 
1732         return AE_OK;
1733 }
1734 
1735 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
1736 {
1737         bool *is_spi_i2c_slave_p = data;
1738 
1739         if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1740                 return 1;
1741 
1742         /*
1743          * devices that are connected to UART still need to be enumerated to
1744          * platform bus
1745          */
1746         if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
1747                 *is_spi_i2c_slave_p = true;
1748 
1749          /* no need to do more checking */
1750         return -1;
1751 }
1752 
1753 static void acpi_default_enumeration(struct acpi_device *device)
1754 {
1755         struct list_head resource_list;
1756         bool is_spi_i2c_slave = false;
1757 
1758         /*
1759          * Do not enumerate SPI/I2C slaves as they will be enumerated by their
1760          * respective parents.
1761          */
1762         INIT_LIST_HEAD(&resource_list);
1763         acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
1764                                &is_spi_i2c_slave);
1765         acpi_dev_free_resource_list(&resource_list);
1766         if (!is_spi_i2c_slave) {
1767                 acpi_create_platform_device(device, NULL);
1768                 acpi_device_set_enumerated(device);
1769         } else {
1770                 blocking_notifier_call_chain(&acpi_reconfig_chain,
1771                                              ACPI_RECONFIG_DEVICE_ADD, device);
1772         }
1773 }
1774 
1775 static const struct acpi_device_id generic_device_ids[] = {
1776         {ACPI_DT_NAMESPACE_HID, },
1777         {"", },
1778 };
1779 
1780 static int acpi_generic_device_attach(struct acpi_device *adev,
1781                                       const struct acpi_device_id *not_used)
1782 {
1783         /*
1784          * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1785          * below can be unconditional.
1786          */
1787         if (adev->data.of_compatible)
1788                 acpi_default_enumeration(adev);
1789 
1790         return 1;
1791 }
1792 
1793 static struct acpi_scan_handler generic_device_handler = {
1794         .ids = generic_device_ids,
1795         .attach = acpi_generic_device_attach,
1796 };
1797 
1798 static int acpi_scan_attach_handler(struct acpi_device *device)
1799 {
1800         struct acpi_hardware_id *hwid;
1801         int ret = 0;
1802 
1803         list_for_each_entry(hwid, &device->pnp.ids, list) {
1804                 const struct acpi_device_id *devid;
1805                 struct acpi_scan_handler *handler;
1806 
1807                 handler = acpi_scan_match_handler(hwid->id, &devid);
1808                 if (handler) {
1809                         if (!handler->attach) {
1810                                 device->pnp.type.platform_id = 0;
1811                                 continue;
1812                         }
1813                         device->handler = handler;
1814                         ret = handler->attach(device, devid);
1815                         if (ret > 0)
1816                                 break;
1817 
1818                         device->handler = NULL;
1819                         if (ret < 0)
1820                                 break;
1821                 }
1822         }
1823 
1824         return ret;
1825 }
1826 
1827 static void acpi_bus_attach(struct acpi_device *device)
1828 {
1829         struct acpi_device *child;
1830         acpi_handle ejd;
1831         int ret;
1832 
1833         if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1834                 register_dock_dependent_device(device, ejd);
1835 
1836         acpi_bus_get_status(device);
1837         /* Skip devices that are not present. */
1838         if (!acpi_device_is_present(device)) {
1839                 acpi_device_clear_enumerated(device);
1840                 device->flags.power_manageable = 0;
1841                 return;
1842         }
1843         if (device->handler)
1844                 goto ok;
1845 
1846         if (!device->flags.initialized) {
1847                 device->flags.power_manageable =
1848                         device->power.states[ACPI_STATE_D0].flags.valid;
1849                 if (acpi_bus_init_power(device))
1850                         device->flags.power_manageable = 0;
1851 
1852                 device->flags.initialized = true;
1853         }
1854 
1855         ret = acpi_scan_attach_handler(device);
1856         if (ret < 0)
1857                 return;
1858 
1859         device->flags.match_driver = true;
1860         if (!ret) {
1861                 ret = device_attach(&device->dev);
1862                 if (ret < 0)
1863                         return;
1864 
1865                 if (!ret && device->pnp.type.platform_id)
1866                         acpi_default_enumeration(device);
1867         }
1868 
1869  ok:
1870         list_for_each_entry(child, &device->children, node)
1871                 acpi_bus_attach(child);
1872 
1873         if (device->handler && device->handler->hotplug.notify_online)
1874                 device->handler->hotplug.notify_online(device);
1875 }
1876 
1877 void acpi_walk_dep_device_list(acpi_handle handle)
1878 {
1879         struct acpi_dep_data *dep, *tmp;
1880         struct acpi_device *adev;
1881 
1882         mutex_lock(&acpi_dep_list_lock);
1883         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1884                 if (dep->master == handle) {
1885                         acpi_bus_get_device(dep->slave, &adev);
1886                         if (!adev)
1887                                 continue;
1888 
1889                         adev->dep_unmet--;
1890                         if (!adev->dep_unmet)
1891                                 acpi_bus_attach(adev);
1892                         list_del(&dep->node);
1893                         kfree(dep);
1894                 }
1895         }
1896         mutex_unlock(&acpi_dep_list_lock);
1897 }
1898 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1899 
1900 /**
1901  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1902  * @handle: Root of the namespace scope to scan.
1903  *
1904  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1905  * found devices.
1906  *
1907  * If no devices were found, -ENODEV is returned, but it does not mean that
1908  * there has been a real error.  There just have been no suitable ACPI objects
1909  * in the table trunk from which the kernel could create a device and add an
1910  * appropriate driver.
1911  *
1912  * Must be called under acpi_scan_lock.
1913  */
1914 int acpi_bus_scan(acpi_handle handle)
1915 {
1916         void *device = NULL;
1917 
1918         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1919                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1920                                     acpi_bus_check_add, NULL, NULL, &device);
1921 
1922         if (device) {
1923                 acpi_bus_attach(device);
1924                 return 0;
1925         }
1926         return -ENODEV;
1927 }
1928 EXPORT_SYMBOL(acpi_bus_scan);
1929 
1930 /**
1931  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1932  * @adev: Root of the ACPI namespace scope to walk.
1933  *
1934  * Must be called under acpi_scan_lock.
1935  */
1936 void acpi_bus_trim(struct acpi_device *adev)
1937 {
1938         struct acpi_scan_handler *handler = adev->handler;
1939         struct acpi_device *child;
1940 
1941         list_for_each_entry_reverse(child, &adev->children, node)
1942                 acpi_bus_trim(child);
1943 
1944         adev->flags.match_driver = false;
1945         if (handler) {
1946                 if (handler->detach)
1947                         handler->detach(adev);
1948 
1949                 adev->handler = NULL;
1950         } else {
1951                 device_release_driver(&adev->dev);
1952         }
1953         /*
1954          * Most likely, the device is going away, so put it into D3cold before
1955          * that.
1956          */
1957         acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
1958         adev->flags.initialized = false;
1959         acpi_device_clear_enumerated(adev);
1960 }
1961 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1962 
1963 static int acpi_bus_scan_fixed(void)
1964 {
1965         int result = 0;
1966 
1967         /*
1968          * Enumerate all fixed-feature devices.
1969          */
1970         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1971                 struct acpi_device *device = NULL;
1972 
1973                 result = acpi_add_single_object(&device, NULL,
1974                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1975                                                 ACPI_STA_DEFAULT);
1976                 if (result)
1977                         return result;
1978 
1979                 device->flags.match_driver = true;
1980                 result = device_attach(&device->dev);
1981                 if (result < 0)
1982                         return result;
1983 
1984                 device_init_wakeup(&device->dev, true);
1985         }
1986 
1987         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1988                 struct acpi_device *device = NULL;
1989 
1990                 result = acpi_add_single_object(&device, NULL,
1991                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1992                                                 ACPI_STA_DEFAULT);
1993                 if (result)
1994                         return result;
1995 
1996                 device->flags.match_driver = true;
1997                 result = device_attach(&device->dev);
1998         }
1999 
2000         return result < 0 ? result : 0;
2001 }
2002 
2003 static void __init acpi_get_spcr_uart_addr(void)
2004 {
2005         acpi_status status;
2006         struct acpi_table_spcr *spcr_ptr;
2007 
2008         status = acpi_get_table(ACPI_SIG_SPCR, 0,
2009                                 (struct acpi_table_header **)&spcr_ptr);
2010         if (ACPI_SUCCESS(status))
2011                 spcr_uart_addr = spcr_ptr->serial_port.address;
2012         else
2013                 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
2014 }
2015 
2016 static bool acpi_scan_initialized;
2017 
2018 int __init acpi_scan_init(void)
2019 {
2020         int result;
2021         acpi_status status;
2022         struct acpi_table_stao *stao_ptr;
2023 
2024         acpi_pci_root_init();
2025         acpi_pci_link_init();
2026         acpi_processor_init();
2027         acpi_lpss_init();
2028         acpi_apd_init();
2029         acpi_cmos_rtc_init();
2030         acpi_container_init();
2031         acpi_memory_hotplug_init();
2032         acpi_pnp_init();
2033         acpi_int340x_thermal_init();
2034         acpi_amba_init();
2035         acpi_watchdog_init();
2036 
2037         acpi_scan_add_handler(&generic_device_handler);
2038 
2039         /*
2040          * If there is STAO table, check whether it needs to ignore the UART
2041          * device in SPCR table.
2042          */
2043         status = acpi_get_table(ACPI_SIG_STAO, 0,
2044                                 (struct acpi_table_header **)&stao_ptr);
2045         if (ACPI_SUCCESS(status)) {
2046                 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2047                         printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2048 
2049                 if (stao_ptr->ignore_uart)
2050                         acpi_get_spcr_uart_addr();
2051         }
2052 
2053         mutex_lock(&acpi_scan_lock);
2054         /*
2055          * Enumerate devices in the ACPI namespace.
2056          */
2057         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2058         if (result)
2059                 goto out;
2060 
2061         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2062         if (result)
2063                 goto out;
2064 
2065         /* Fixed feature devices do not exist on HW-reduced platform */
2066         if (!acpi_gbl_reduced_hardware) {
2067                 result = acpi_bus_scan_fixed();
2068                 if (result) {
2069                         acpi_detach_data(acpi_root->handle,
2070                                          acpi_scan_drop_device);
2071                         acpi_device_del(acpi_root);
2072                         put_device(&acpi_root->dev);
2073                         goto out;
2074                 }
2075         }
2076 
2077         acpi_gpe_apply_masked_gpes();
2078         acpi_update_all_gpes();
2079         acpi_ec_ecdt_start();
2080 
2081         acpi_scan_initialized = true;
2082 
2083  out:
2084         mutex_unlock(&acpi_scan_lock);
2085         return result;
2086 }
2087 
2088 static struct acpi_probe_entry *ape;
2089 static int acpi_probe_count;
2090 static DEFINE_MUTEX(acpi_probe_mutex);
2091 
2092 static int __init acpi_match_madt(struct acpi_subtable_header *header,
2093                                   const unsigned long end)
2094 {
2095         if (!ape->subtable_valid || ape->subtable_valid(header, ape))
2096                 if (!ape->probe_subtbl(header, end))
2097                         acpi_probe_count++;
2098 
2099         return 0;
2100 }
2101 
2102 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2103 {
2104         int count = 0;
2105 
2106         if (acpi_disabled)
2107                 return 0;
2108 
2109         mutex_lock(&acpi_probe_mutex);
2110         for (ape = ap_head; nr; ape++, nr--) {
2111                 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
2112                         acpi_probe_count = 0;
2113                         acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2114                         count += acpi_probe_count;
2115                 } else {
2116                         int res;
2117                         res = acpi_table_parse(ape->id, ape->probe_table);
2118                         if (!res)
2119                                 count++;
2120                 }
2121         }
2122         mutex_unlock(&acpi_probe_mutex);
2123 
2124         return count;
2125 }
2126 
2127 struct acpi_table_events_work {
2128         struct work_struct work;
2129         void *table;
2130         u32 event;
2131 };
2132 
2133 static void acpi_table_events_fn(struct work_struct *work)
2134 {
2135         struct acpi_table_events_work *tew;
2136 
2137         tew = container_of(work, struct acpi_table_events_work, work);
2138 
2139         if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2140                 acpi_scan_lock_acquire();
2141                 acpi_bus_scan(ACPI_ROOT_OBJECT);
2142                 acpi_scan_lock_release();
2143         }
2144 
2145         kfree(tew);
2146 }
2147 
2148 void acpi_scan_table_handler(u32 event, void *table, void *context)
2149 {
2150         struct acpi_table_events_work *tew;
2151 
2152         if (!acpi_scan_initialized)
2153                 return;
2154 
2155         if (event != ACPI_TABLE_EVENT_LOAD)
2156                 return;
2157 
2158         tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2159         if (!tew)
2160                 return;
2161 
2162         INIT_WORK(&tew->work, acpi_table_events_fn);
2163         tew->table = table;
2164         tew->event = event;
2165 
2166         schedule_work(&tew->work);
2167 }
2168 
2169 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2170 {
2171         return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2172 }
2173 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2174 
2175 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2176 {
2177         return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2178 }
2179 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);
2180 

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