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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * scan.c - support for transforming the ACPI namespace into individual objects4 */5 6#define pr_fmt(fmt) "ACPI: " fmt7 8#include <linux/module.h>9#include <linux/init.h>10#include <linux/slab.h>11#include <linux/kernel.h>12#include <linux/acpi.h>13#include <linux/acpi_iort.h>14#include <linux/acpi_viot.h>15#include <linux/iommu.h>16#include <linux/signal.h>17#include <linux/kthread.h>18#include <linux/dmi.h>19#include <linux/dma-map-ops.h>20#include <linux/platform_data/x86/apple.h>21#include <linux/pgtable.h>22#include <linux/crc32.h>23#include <linux/dma-direct.h>24 25#include "internal.h"26#include "sleep.h"27 28#define ACPI_BUS_CLASS "system_bus"29#define ACPI_BUS_HID "LNXSYBUS"30#define ACPI_BUS_DEVICE_NAME "System Bus"31 32#define INVALID_ACPI_HANDLE ((acpi_handle)ZERO_PAGE(0))33 34static const char *dummy_hid = "device";35 36static LIST_HEAD(acpi_dep_list);37static DEFINE_MUTEX(acpi_dep_list_lock);38LIST_HEAD(acpi_bus_id_list);39static DEFINE_MUTEX(acpi_scan_lock);40static LIST_HEAD(acpi_scan_handlers_list);41DEFINE_MUTEX(acpi_device_lock);42LIST_HEAD(acpi_wakeup_device_list);43static DEFINE_MUTEX(acpi_hp_context_lock);44 45/*46 * The UART device described by the SPCR table is the only object which needs47 * special-casing. Everything else is covered by ACPI namespace paths in STAO48 * table.49 */50static u64 spcr_uart_addr;51 52void acpi_scan_lock_acquire(void)53{54 mutex_lock(&acpi_scan_lock);55}56EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);57 58void acpi_scan_lock_release(void)59{60 mutex_unlock(&acpi_scan_lock);61}62EXPORT_SYMBOL_GPL(acpi_scan_lock_release);63 64void acpi_lock_hp_context(void)65{66 mutex_lock(&acpi_hp_context_lock);67}68 69void acpi_unlock_hp_context(void)70{71 mutex_unlock(&acpi_hp_context_lock);72}73 74void acpi_initialize_hp_context(struct acpi_device *adev,75 struct acpi_hotplug_context *hp,76 acpi_hp_notify notify, acpi_hp_uevent uevent)77{78 acpi_lock_hp_context();79 hp->notify = notify;80 hp->uevent = uevent;81 acpi_set_hp_context(adev, hp);82 acpi_unlock_hp_context();83}84EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);85 86int acpi_scan_add_handler(struct acpi_scan_handler *handler)87{88 if (!handler)89 return -EINVAL;90 91 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);92 return 0;93}94 95int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,96 const char *hotplug_profile_name)97{98 int error;99 100 error = acpi_scan_add_handler(handler);101 if (error)102 return error;103 104 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);105 return 0;106}107 108bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)109{110 struct acpi_device_physical_node *pn;111 bool offline = true;112 char *envp[] = { "EVENT=offline", NULL };113 114 /*115 * acpi_container_offline() calls this for all of the container's116 * children under the container's physical_node_lock lock.117 */118 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);119 120 list_for_each_entry(pn, &adev->physical_node_list, node)121 if (device_supports_offline(pn->dev) && !pn->dev->offline) {122 if (uevent)123 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);124 125 offline = false;126 break;127 }128 129 mutex_unlock(&adev->physical_node_lock);130 return offline;131}132 133static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,134 void **ret_p)135{136 struct acpi_device *device = acpi_fetch_acpi_dev(handle);137 struct acpi_device_physical_node *pn;138 bool second_pass = (bool)data;139 acpi_status status = AE_OK;140 141 if (!device)142 return AE_OK;143 144 if (device->handler && !device->handler->hotplug.enabled) {145 *ret_p = &device->dev;146 return AE_SUPPORT;147 }148 149 mutex_lock(&device->physical_node_lock);150 151 list_for_each_entry(pn, &device->physical_node_list, node) {152 int ret;153 154 if (second_pass) {155 /* Skip devices offlined by the first pass. */156 if (pn->put_online)157 continue;158 } else {159 pn->put_online = false;160 }161 ret = device_offline(pn->dev);162 if (ret >= 0) {163 pn->put_online = !ret;164 } else {165 *ret_p = pn->dev;166 if (second_pass) {167 status = AE_ERROR;168 break;169 }170 }171 }172 173 mutex_unlock(&device->physical_node_lock);174 175 return status;176}177 178static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,179 void **ret_p)180{181 struct acpi_device *device = acpi_fetch_acpi_dev(handle);182 struct acpi_device_physical_node *pn;183 184 if (!device)185 return AE_OK;186 187 mutex_lock(&device->physical_node_lock);188 189 list_for_each_entry(pn, &device->physical_node_list, node)190 if (pn->put_online) {191 device_online(pn->dev);192 pn->put_online = false;193 }194 195 mutex_unlock(&device->physical_node_lock);196 197 return AE_OK;198}199 200static int acpi_scan_try_to_offline(struct acpi_device *device)201{202 acpi_handle handle = device->handle;203 struct device *errdev = NULL;204 acpi_status status;205 206 /*207 * Carry out two passes here and ignore errors in the first pass,208 * because if the devices in question are memory blocks and209 * CONFIG_MEMCG is set, one of the blocks may hold data structures210 * that the other blocks depend on, but it is not known in advance which211 * block holds them.212 *213 * If the first pass is successful, the second one isn't needed, though.214 */215 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,216 NULL, acpi_bus_offline, (void *)false,217 (void **)&errdev);218 if (status == AE_SUPPORT) {219 dev_warn(errdev, "Offline disabled.\n");220 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,221 acpi_bus_online, NULL, NULL, NULL);222 return -EPERM;223 }224 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);225 if (errdev) {226 errdev = NULL;227 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,228 NULL, acpi_bus_offline, (void *)true,229 (void **)&errdev);230 if (!errdev)231 acpi_bus_offline(handle, 0, (void *)true,232 (void **)&errdev);233 234 if (errdev) {235 dev_warn(errdev, "Offline failed.\n");236 acpi_bus_online(handle, 0, NULL, NULL);237 acpi_walk_namespace(ACPI_TYPE_ANY, handle,238 ACPI_UINT32_MAX, acpi_bus_online,239 NULL, NULL, NULL);240 return -EBUSY;241 }242 }243 return 0;244}245 246#define ACPI_SCAN_CHECK_FLAG_STATUS BIT(0)247#define ACPI_SCAN_CHECK_FLAG_EJECT BIT(1)248 249static int acpi_scan_check_and_detach(struct acpi_device *adev, void *p)250{251 struct acpi_scan_handler *handler = adev->handler;252 uintptr_t flags = (uintptr_t)p;253 254 acpi_dev_for_each_child_reverse(adev, acpi_scan_check_and_detach, p);255 256 if (flags & ACPI_SCAN_CHECK_FLAG_STATUS) {257 acpi_bus_get_status(adev);258 /*259 * Skip devices that are still there and take the enabled260 * flag into account.261 */262 if (acpi_device_is_enabled(adev))263 return 0;264 265 /* Skip device that have not been enumerated. */266 if (!acpi_device_enumerated(adev)) {267 dev_dbg(&adev->dev, "Still not enumerated\n");268 return 0;269 }270 }271 272 adev->flags.match_driver = false;273 if (handler) {274 if (handler->detach)275 handler->detach(adev);276 } else {277 device_release_driver(&adev->dev);278 }279 /*280 * Most likely, the device is going away, so put it into D3cold before281 * that.282 */283 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);284 adev->flags.initialized = false;285 286 /* For eject this is deferred to acpi_bus_post_eject() */287 if (!(flags & ACPI_SCAN_CHECK_FLAG_EJECT)) {288 adev->handler = NULL;289 acpi_device_clear_enumerated(adev);290 }291 return 0;292}293 294static int acpi_bus_post_eject(struct acpi_device *adev, void *not_used)295{296 struct acpi_scan_handler *handler = adev->handler;297 298 acpi_dev_for_each_child_reverse(adev, acpi_bus_post_eject, NULL);299 300 if (handler) {301 if (handler->post_eject)302 handler->post_eject(adev);303 304 adev->handler = NULL;305 }306 307 acpi_device_clear_enumerated(adev);308 309 return 0;310}311 312static void acpi_scan_check_subtree(struct acpi_device *adev)313{314 uintptr_t flags = ACPI_SCAN_CHECK_FLAG_STATUS;315 316 acpi_scan_check_and_detach(adev, (void *)flags);317}318 319static int acpi_scan_hot_remove(struct acpi_device *device)320{321 acpi_handle handle = device->handle;322 unsigned long long sta;323 acpi_status status;324 uintptr_t flags = ACPI_SCAN_CHECK_FLAG_EJECT;325 326 if (device->handler && device->handler->hotplug.demand_offline) {327 if (!acpi_scan_is_offline(device, true))328 return -EBUSY;329 } else {330 int error = acpi_scan_try_to_offline(device);331 if (error)332 return error;333 }334 335 acpi_handle_debug(handle, "Ejecting\n");336 337 acpi_scan_check_and_detach(device, (void *)flags);338 339 acpi_evaluate_lck(handle, 0);340 /*341 * TBD: _EJD support.342 */343 status = acpi_evaluate_ej0(handle);344 if (status == AE_NOT_FOUND)345 return -ENODEV;346 else if (ACPI_FAILURE(status))347 return -EIO;348 349 /*350 * Verify if eject was indeed successful. If not, log an error351 * message. No need to call _OST since _EJ0 call was made OK.352 */353 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);354 if (ACPI_FAILURE(status)) {355 acpi_handle_warn(handle,356 "Status check after eject failed (0x%x)\n", status);357 } else if (sta & ACPI_STA_DEVICE_ENABLED) {358 acpi_handle_warn(handle,359 "Eject incomplete - status 0x%llx\n", sta);360 } else {361 acpi_bus_post_eject(device, NULL);362 }363 364 return 0;365}366 367static int acpi_scan_rescan_bus(struct acpi_device *adev)368{369 struct acpi_scan_handler *handler = adev->handler;370 int ret;371 372 if (handler && handler->hotplug.scan_dependent)373 ret = handler->hotplug.scan_dependent(adev);374 else375 ret = acpi_bus_scan(adev->handle);376 377 if (ret)378 dev_info(&adev->dev, "Namespace scan failure\n");379 380 return ret;381}382 383static int acpi_scan_device_check(struct acpi_device *adev)384{385 struct acpi_device *parent;386 387 acpi_scan_check_subtree(adev);388 389 if (!acpi_device_is_present(adev))390 return 0;391 392 /*393 * This function is only called for device objects for which matching394 * scan handlers exist. The only situation in which the scan handler395 * is not attached to this device object yet is when the device has396 * just appeared (either it wasn't present at all before or it was397 * removed and then added again).398 */399 if (adev->handler) {400 dev_dbg(&adev->dev, "Already enumerated\n");401 return 0;402 }403 404 parent = acpi_dev_parent(adev);405 if (!parent)406 parent = adev;407 408 return acpi_scan_rescan_bus(parent);409}410 411static int acpi_scan_bus_check(struct acpi_device *adev)412{413 acpi_scan_check_subtree(adev);414 415 return acpi_scan_rescan_bus(adev);416}417 418static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)419{420 switch (type) {421 case ACPI_NOTIFY_BUS_CHECK:422 return acpi_scan_bus_check(adev);423 case ACPI_NOTIFY_DEVICE_CHECK:424 return acpi_scan_device_check(adev);425 case ACPI_NOTIFY_EJECT_REQUEST:426 case ACPI_OST_EC_OSPM_EJECT:427 if (adev->handler && !adev->handler->hotplug.enabled) {428 dev_info(&adev->dev, "Eject disabled\n");429 return -EPERM;430 }431 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,432 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);433 return acpi_scan_hot_remove(adev);434 }435 return -EINVAL;436}437 438void acpi_device_hotplug(struct acpi_device *adev, u32 src)439{440 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;441 int error = -ENODEV;442 443 lock_device_hotplug();444 mutex_lock(&acpi_scan_lock);445 446 /*447 * The device object's ACPI handle cannot become invalid as long as we448 * are holding acpi_scan_lock, but it might have become invalid before449 * that lock was acquired.450 */451 if (adev->handle == INVALID_ACPI_HANDLE)452 goto err_out;453 454 if (adev->flags.is_dock_station) {455 error = dock_notify(adev, src);456 } else if (adev->flags.hotplug_notify) {457 error = acpi_generic_hotplug_event(adev, src);458 } else {459 acpi_hp_notify notify;460 461 acpi_lock_hp_context();462 notify = adev->hp ? adev->hp->notify : NULL;463 acpi_unlock_hp_context();464 /*465 * There may be additional notify handlers for device objects466 * without the .event() callback, so ignore them here.467 */468 if (notify)469 error = notify(adev, src);470 else471 goto out;472 }473 switch (error) {474 case 0:475 ost_code = ACPI_OST_SC_SUCCESS;476 break;477 case -EPERM:478 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;479 break;480 case -EBUSY:481 ost_code = ACPI_OST_SC_DEVICE_BUSY;482 break;483 default:484 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;485 break;486 }487 488 err_out:489 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);490 491 out:492 acpi_put_acpi_dev(adev);493 mutex_unlock(&acpi_scan_lock);494 unlock_device_hotplug();495}496 497static void acpi_free_power_resources_lists(struct acpi_device *device)498{499 int i;500 501 if (device->wakeup.flags.valid)502 acpi_power_resources_list_free(&device->wakeup.resources);503 504 if (!device->power.flags.power_resources)505 return;506 507 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {508 struct acpi_device_power_state *ps = &device->power.states[i];509 acpi_power_resources_list_free(&ps->resources);510 }511}512 513static void acpi_device_release(struct device *dev)514{515 struct acpi_device *acpi_dev = to_acpi_device(dev);516 517 acpi_free_properties(acpi_dev);518 acpi_free_pnp_ids(&acpi_dev->pnp);519 acpi_free_power_resources_lists(acpi_dev);520 kfree(acpi_dev);521}522 523static void acpi_device_del(struct acpi_device *device)524{525 struct acpi_device_bus_id *acpi_device_bus_id;526 527 mutex_lock(&acpi_device_lock);528 529 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)530 if (!strcmp(acpi_device_bus_id->bus_id,531 acpi_device_hid(device))) {532 ida_free(&acpi_device_bus_id->instance_ida,533 device->pnp.instance_no);534 if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {535 list_del(&acpi_device_bus_id->node);536 kfree_const(acpi_device_bus_id->bus_id);537 kfree(acpi_device_bus_id);538 }539 break;540 }541 542 list_del(&device->wakeup_list);543 544 mutex_unlock(&acpi_device_lock);545 546 acpi_power_add_remove_device(device, false);547 acpi_device_remove_files(device);548 if (device->remove)549 device->remove(device);550 551 device_del(&device->dev);552}553 554static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);555 556static LIST_HEAD(acpi_device_del_list);557static DEFINE_MUTEX(acpi_device_del_lock);558 559static void acpi_device_del_work_fn(struct work_struct *work_not_used)560{561 for (;;) {562 struct acpi_device *adev;563 564 mutex_lock(&acpi_device_del_lock);565 566 if (list_empty(&acpi_device_del_list)) {567 mutex_unlock(&acpi_device_del_lock);568 break;569 }570 adev = list_first_entry(&acpi_device_del_list,571 struct acpi_device, del_list);572 list_del(&adev->del_list);573 574 mutex_unlock(&acpi_device_del_lock);575 576 blocking_notifier_call_chain(&acpi_reconfig_chain,577 ACPI_RECONFIG_DEVICE_REMOVE, adev);578 579 acpi_device_del(adev);580 /*581 * Drop references to all power resources that might have been582 * used by the device.583 */584 acpi_power_transition(adev, ACPI_STATE_D3_COLD);585 acpi_dev_put(adev);586 }587}588 589/**590 * acpi_scan_drop_device - Drop an ACPI device object.591 * @handle: Handle of an ACPI namespace node, not used.592 * @context: Address of the ACPI device object to drop.593 *594 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI595 * namespace node the device object pointed to by @context is attached to.596 *597 * The unregistration is carried out asynchronously to avoid running598 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to599 * ensure the correct ordering (the device objects must be unregistered in the600 * same order in which the corresponding namespace nodes are deleted).601 */602static void acpi_scan_drop_device(acpi_handle handle, void *context)603{604 static DECLARE_WORK(work, acpi_device_del_work_fn);605 struct acpi_device *adev = context;606 607 mutex_lock(&acpi_device_del_lock);608 609 /*610 * Use the ACPI hotplug workqueue which is ordered, so this work item611 * won't run after any hotplug work items submitted subsequently. That612 * prevents attempts to register device objects identical to those being613 * deleted from happening concurrently (such attempts result from614 * hotplug events handled via the ACPI hotplug workqueue). It also will615 * run after all of the work items submitted previously, which helps616 * those work items to ensure that they are not accessing stale device617 * objects.618 */619 if (list_empty(&acpi_device_del_list))620 acpi_queue_hotplug_work(&work);621 622 list_add_tail(&adev->del_list, &acpi_device_del_list);623 /* Make acpi_ns_validate_handle() return NULL for this handle. */624 adev->handle = INVALID_ACPI_HANDLE;625 626 mutex_unlock(&acpi_device_del_lock);627}628 629static struct acpi_device *handle_to_device(acpi_handle handle,630 void (*callback)(void *))631{632 struct acpi_device *adev = NULL;633 acpi_status status;634 635 status = acpi_get_data_full(handle, acpi_scan_drop_device,636 (void **)&adev, callback);637 if (ACPI_FAILURE(status) || !adev) {638 acpi_handle_debug(handle, "No context!\n");639 return NULL;640 }641 return adev;642}643 644/**645 * acpi_fetch_acpi_dev - Retrieve ACPI device object.646 * @handle: ACPI handle associated with the requested ACPI device object.647 *648 * Return a pointer to the ACPI device object associated with @handle, if649 * present, or NULL otherwise.650 */651struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)652{653 return handle_to_device(handle, NULL);654}655EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);656 657static void get_acpi_device(void *dev)658{659 acpi_dev_get(dev);660}661 662/**663 * acpi_get_acpi_dev - Retrieve ACPI device object and reference count it.664 * @handle: ACPI handle associated with the requested ACPI device object.665 *666 * Return a pointer to the ACPI device object associated with @handle and bump667 * up that object's reference counter (under the ACPI Namespace lock), if668 * present, or return NULL otherwise.669 *670 * The ACPI device object reference acquired by this function needs to be671 * dropped via acpi_dev_put().672 */673struct acpi_device *acpi_get_acpi_dev(acpi_handle handle)674{675 return handle_to_device(handle, get_acpi_device);676}677EXPORT_SYMBOL_GPL(acpi_get_acpi_dev);678 679static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)680{681 struct acpi_device_bus_id *acpi_device_bus_id;682 683 /* Find suitable bus_id and instance number in acpi_bus_id_list. */684 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {685 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))686 return acpi_device_bus_id;687 }688 return NULL;689}690 691static int acpi_device_set_name(struct acpi_device *device,692 struct acpi_device_bus_id *acpi_device_bus_id)693{694 struct ida *instance_ida = &acpi_device_bus_id->instance_ida;695 int result;696 697 result = ida_alloc(instance_ida, GFP_KERNEL);698 if (result < 0)699 return result;700 701 device->pnp.instance_no = result;702 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);703 return 0;704}705 706int acpi_tie_acpi_dev(struct acpi_device *adev)707{708 acpi_handle handle = adev->handle;709 acpi_status status;710 711 if (!handle)712 return 0;713 714 status = acpi_attach_data(handle, acpi_scan_drop_device, adev);715 if (ACPI_FAILURE(status)) {716 acpi_handle_err(handle, "Unable to attach device data\n");717 return -ENODEV;718 }719 720 return 0;721}722 723static void acpi_store_pld_crc(struct acpi_device *adev)724{725 struct acpi_pld_info *pld;726 acpi_status status;727 728 status = acpi_get_physical_device_location(adev->handle, &pld);729 if (ACPI_FAILURE(status))730 return;731 732 adev->pld_crc = crc32(~0, pld, sizeof(*pld));733 ACPI_FREE(pld);734}735 736int acpi_device_add(struct acpi_device *device)737{738 struct acpi_device_bus_id *acpi_device_bus_id;739 int result;740 741 /*742 * Linkage743 * -------744 * Link this device to its parent and siblings.745 */746 INIT_LIST_HEAD(&device->wakeup_list);747 INIT_LIST_HEAD(&device->physical_node_list);748 INIT_LIST_HEAD(&device->del_list);749 mutex_init(&device->physical_node_lock);750 751 mutex_lock(&acpi_device_lock);752 753 acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));754 if (acpi_device_bus_id) {755 result = acpi_device_set_name(device, acpi_device_bus_id);756 if (result)757 goto err_unlock;758 } else {759 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),760 GFP_KERNEL);761 if (!acpi_device_bus_id) {762 result = -ENOMEM;763 goto err_unlock;764 }765 acpi_device_bus_id->bus_id =766 kstrdup_const(acpi_device_hid(device), GFP_KERNEL);767 if (!acpi_device_bus_id->bus_id) {768 kfree(acpi_device_bus_id);769 result = -ENOMEM;770 goto err_unlock;771 }772 773 ida_init(&acpi_device_bus_id->instance_ida);774 775 result = acpi_device_set_name(device, acpi_device_bus_id);776 if (result) {777 kfree_const(acpi_device_bus_id->bus_id);778 kfree(acpi_device_bus_id);779 goto err_unlock;780 }781 782 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);783 }784 785 if (device->wakeup.flags.valid)786 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);787 788 acpi_store_pld_crc(device);789 790 mutex_unlock(&acpi_device_lock);791 792 result = device_add(&device->dev);793 if (result) {794 dev_err(&device->dev, "Error registering device\n");795 goto err;796 }797 798 acpi_device_setup_files(device);799 800 return 0;801 802err:803 mutex_lock(&acpi_device_lock);804 805 list_del(&device->wakeup_list);806 807err_unlock:808 mutex_unlock(&acpi_device_lock);809 810 acpi_detach_data(device->handle, acpi_scan_drop_device);811 812 return result;813}814 815/* --------------------------------------------------------------------------816 Device Enumeration817 -------------------------------------------------------------------------- */818static bool acpi_info_matches_ids(struct acpi_device_info *info,819 const char * const ids[])820{821 struct acpi_pnp_device_id_list *cid_list = NULL;822 int i, index;823 824 if (!(info->valid & ACPI_VALID_HID))825 return false;826 827 index = match_string(ids, -1, info->hardware_id.string);828 if (index >= 0)829 return true;830 831 if (info->valid & ACPI_VALID_CID)832 cid_list = &info->compatible_id_list;833 834 if (!cid_list)835 return false;836 837 for (i = 0; i < cid_list->count; i++) {838 index = match_string(ids, -1, cid_list->ids[i].string);839 if (index >= 0)840 return true;841 }842 843 return false;844}845 846/* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */847static const char * const acpi_ignore_dep_ids[] = {848 "PNP0D80", /* Windows-compatible System Power Management Controller */849 "INT33BD", /* Intel Baytrail Mailbox Device */850 "LATT2021", /* Lattice FW Update Client Driver */851 NULL852};853 854/* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */855static const char * const acpi_honor_dep_ids[] = {856 "INT3472", /* Camera sensor PMIC / clk and regulator info */857 "INTC1059", /* IVSC (TGL) driver must be loaded to allow i2c access to camera sensors */858 "INTC1095", /* IVSC (ADL) driver must be loaded to allow i2c access to camera sensors */859 "INTC100A", /* IVSC (RPL) driver must be loaded to allow i2c access to camera sensors */860 "INTC10CF", /* IVSC (MTL) driver must be loaded to allow i2c access to camera sensors */861 "RSCV0001", /* RISC-V PLIC */862 "RSCV0002", /* RISC-V APLIC */863 "PNP0C0F", /* PCI Link Device */864 NULL865};866 867static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle)868{869 struct acpi_device *adev;870 871 /*872 * Fixed hardware devices do not appear in the namespace and do not873 * have handles, but we fabricate acpi_devices for them, so we have874 * to deal with them specially.875 */876 if (!handle)877 return acpi_root;878 879 do {880 acpi_status status;881 882 status = acpi_get_parent(handle, &handle);883 if (ACPI_FAILURE(status)) {884 if (status != AE_NULL_ENTRY)885 return acpi_root;886 887 return NULL;888 }889 adev = acpi_fetch_acpi_dev(handle);890 } while (!adev);891 return adev;892}893 894acpi_status895acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)896{897 acpi_status status;898 acpi_handle tmp;899 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};900 union acpi_object *obj;901 902 status = acpi_get_handle(handle, "_EJD", &tmp);903 if (ACPI_FAILURE(status))904 return status;905 906 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);907 if (ACPI_SUCCESS(status)) {908 obj = buffer.pointer;909 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,910 ejd);911 kfree(buffer.pointer);912 }913 return status;914}915EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);916 917static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)918{919 acpi_handle handle = dev->handle;920 struct acpi_device_wakeup *wakeup = &dev->wakeup;921 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };922 union acpi_object *package = NULL;923 union acpi_object *element = NULL;924 acpi_status status;925 int err = -ENODATA;926 927 INIT_LIST_HEAD(&wakeup->resources);928 929 /* _PRW */930 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);931 if (ACPI_FAILURE(status)) {932 acpi_handle_info(handle, "_PRW evaluation failed: %s\n",933 acpi_format_exception(status));934 return err;935 }936 937 package = (union acpi_object *)buffer.pointer;938 939 if (!package || package->package.count < 2)940 goto out;941 942 element = &(package->package.elements[0]);943 if (!element)944 goto out;945 946 if (element->type == ACPI_TYPE_PACKAGE) {947 if ((element->package.count < 2) ||948 (element->package.elements[0].type !=949 ACPI_TYPE_LOCAL_REFERENCE)950 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))951 goto out;952 953 wakeup->gpe_device =954 element->package.elements[0].reference.handle;955 wakeup->gpe_number =956 (u32) element->package.elements[1].integer.value;957 } else if (element->type == ACPI_TYPE_INTEGER) {958 wakeup->gpe_device = NULL;959 wakeup->gpe_number = element->integer.value;960 } else {961 goto out;962 }963 964 element = &(package->package.elements[1]);965 if (element->type != ACPI_TYPE_INTEGER)966 goto out;967 968 wakeup->sleep_state = element->integer.value;969 970 err = acpi_extract_power_resources(package, 2, &wakeup->resources);971 if (err)972 goto out;973 974 if (!list_empty(&wakeup->resources)) {975 int sleep_state;976 977 err = acpi_power_wakeup_list_init(&wakeup->resources,978 &sleep_state);979 if (err) {980 acpi_handle_warn(handle, "Retrieving current states "981 "of wakeup power resources failed\n");982 acpi_power_resources_list_free(&wakeup->resources);983 goto out;984 }985 if (sleep_state < wakeup->sleep_state) {986 acpi_handle_warn(handle, "Overriding _PRW sleep state "987 "(S%d) by S%d from power resources\n",988 (int)wakeup->sleep_state, sleep_state);989 wakeup->sleep_state = sleep_state;990 }991 }992 993 out:994 kfree(buffer.pointer);995 return err;996}997 998/* Do not use a button for S5 wakeup */999#define ACPI_AVOID_WAKE_FROM_S5 BIT(0)1000 1001static bool acpi_wakeup_gpe_init(struct acpi_device *device)1002{1003 static const struct acpi_device_id button_device_ids[] = {1004 {"PNP0C0C", 0}, /* Power button */1005 {"PNP0C0D", ACPI_AVOID_WAKE_FROM_S5}, /* Lid */1006 {"PNP0C0E", ACPI_AVOID_WAKE_FROM_S5}, /* Sleep button */1007 {"", 0},1008 };1009 struct acpi_device_wakeup *wakeup = &device->wakeup;1010 const struct acpi_device_id *match;1011 acpi_status status;1012 1013 wakeup->flags.notifier_present = 0;1014 1015 /* Power button, Lid switch always enable wakeup */1016 match = acpi_match_acpi_device(button_device_ids, device);1017 if (match) {1018 if ((match->driver_data & ACPI_AVOID_WAKE_FROM_S5) &&1019 wakeup->sleep_state == ACPI_STATE_S5)1020 wakeup->sleep_state = ACPI_STATE_S4;1021 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);1022 device_set_wakeup_capable(&device->dev, true);1023 return true;1024 }1025 1026 status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,1027 wakeup->gpe_number);1028 return ACPI_SUCCESS(status);1029}1030 1031static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)1032{1033 int err;1034 1035 /* Presence of _PRW indicates wake capable */1036 if (!acpi_has_method(device->handle, "_PRW"))1037 return;1038 1039 err = acpi_bus_extract_wakeup_device_power_package(device);1040 if (err) {1041 dev_err(&device->dev, "Unable to extract wakeup power resources");1042 return;1043 }1044 1045 device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);1046 device->wakeup.prepare_count = 0;1047 /*1048 * Call _PSW/_DSW object to disable its ability to wake the sleeping1049 * system for the ACPI device with the _PRW object.1050 * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.1051 * So it is necessary to call _DSW object first. Only when it is not1052 * present will the _PSW object used.1053 */1054 err = acpi_device_sleep_wake(device, 0, 0, 0);1055 if (err)1056 pr_debug("error in _DSW or _PSW evaluation\n");1057}1058 1059static void acpi_bus_init_power_state(struct acpi_device *device, int state)1060{1061 struct acpi_device_power_state *ps = &device->power.states[state];1062 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };1063 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };1064 acpi_status status;1065 1066 INIT_LIST_HEAD(&ps->resources);1067 1068 /* Evaluate "_PRx" to get referenced power resources */1069 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);1070 if (ACPI_SUCCESS(status)) {1071 union acpi_object *package = buffer.pointer;1072 1073 if (buffer.length && package1074 && package->type == ACPI_TYPE_PACKAGE1075 && package->package.count)1076 acpi_extract_power_resources(package, 0, &ps->resources);1077 1078 ACPI_FREE(buffer.pointer);1079 }1080 1081 /* Evaluate "_PSx" to see if we can do explicit sets */1082 pathname[2] = 'S';1083 if (acpi_has_method(device->handle, pathname))1084 ps->flags.explicit_set = 1;1085 1086 /* State is valid if there are means to put the device into it. */1087 if (!list_empty(&ps->resources) || ps->flags.explicit_set)1088 ps->flags.valid = 1;1089 1090 ps->power = -1; /* Unknown - driver assigned */1091 ps->latency = -1; /* Unknown - driver assigned */1092}1093 1094static void acpi_bus_get_power_flags(struct acpi_device *device)1095{1096 unsigned long long dsc = ACPI_STATE_D0;1097 u32 i;1098 1099 /* Presence of _PS0|_PR0 indicates 'power manageable' */1100 if (!acpi_has_method(device->handle, "_PS0") &&1101 !acpi_has_method(device->handle, "_PR0"))1102 return;1103 1104 device->flags.power_manageable = 1;1105 1106 /*1107 * Power Management Flags1108 */1109 if (acpi_has_method(device->handle, "_PSC"))1110 device->power.flags.explicit_get = 1;1111 1112 if (acpi_has_method(device->handle, "_IRC"))1113 device->power.flags.inrush_current = 1;1114 1115 if (acpi_has_method(device->handle, "_DSW"))1116 device->power.flags.dsw_present = 1;1117 1118 acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc);1119 device->power.state_for_enumeration = dsc;1120 1121 /*1122 * Enumerate supported power management states1123 */1124 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)1125 acpi_bus_init_power_state(device, i);1126 1127 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);1128 1129 /* Set the defaults for D0 and D3hot (always supported). */1130 device->power.states[ACPI_STATE_D0].flags.valid = 1;1131 device->power.states[ACPI_STATE_D0].power = 100;1132 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;1133 1134 /*1135 * Use power resources only if the D0 list of them is populated, because1136 * some platforms may provide _PR3 only to indicate D3cold support and1137 * in those cases the power resources list returned by it may be bogus.1138 */1139 if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {1140 device->power.flags.power_resources = 1;1141 /*1142 * D3cold is supported if the D3hot list of power resources is1143 * not empty.1144 */1145 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))1146 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;1147 }1148 1149 if (acpi_bus_init_power(device))1150 device->flags.power_manageable = 0;1151}1152 1153static void acpi_bus_get_flags(struct acpi_device *device)1154{1155 /* Presence of _STA indicates 'dynamic_status' */1156 if (acpi_has_method(device->handle, "_STA"))1157 device->flags.dynamic_status = 1;1158 1159 /* Presence of _RMV indicates 'removable' */1160 if (acpi_has_method(device->handle, "_RMV"))1161 device->flags.removable = 1;1162 1163 /* Presence of _EJD|_EJ0 indicates 'ejectable' */1164 if (acpi_has_method(device->handle, "_EJD") ||1165 acpi_has_method(device->handle, "_EJ0"))1166 device->flags.ejectable = 1;1167}1168 1169static void acpi_device_get_busid(struct acpi_device *device)1170{1171 char bus_id[5] = { '?', 0 };1172 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };1173 int i = 0;1174 1175 /*1176 * Bus ID1177 * ------1178 * The device's Bus ID is simply the object name.1179 * TBD: Shouldn't this value be unique (within the ACPI namespace)?1180 */1181 if (!acpi_dev_parent(device)) {1182 strcpy(device->pnp.bus_id, "ACPI");1183 return;1184 }1185 1186 switch (device->device_type) {1187 case ACPI_BUS_TYPE_POWER_BUTTON:1188 strcpy(device->pnp.bus_id, "PWRF");1189 break;1190 case ACPI_BUS_TYPE_SLEEP_BUTTON:1191 strcpy(device->pnp.bus_id, "SLPF");1192 break;1193 case ACPI_BUS_TYPE_ECDT_EC:1194 strcpy(device->pnp.bus_id, "ECDT");1195 break;1196 default:1197 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);1198 /* Clean up trailing underscores (if any) */1199 for (i = 3; i > 1; i--) {1200 if (bus_id[i] == '_')1201 bus_id[i] = '\0';1202 else1203 break;1204 }1205 strcpy(device->pnp.bus_id, bus_id);1206 break;1207 }1208}1209 1210/*1211 * acpi_ata_match - see if an acpi object is an ATA device1212 *1213 * If an acpi object has one of the ACPI ATA methods defined,1214 * then we can safely call it an ATA device.1215 */1216bool acpi_ata_match(acpi_handle handle)1217{1218 return acpi_has_method(handle, "_GTF") ||1219 acpi_has_method(handle, "_GTM") ||1220 acpi_has_method(handle, "_STM") ||1221 acpi_has_method(handle, "_SDD");1222}1223 1224/*1225 * acpi_bay_match - see if an acpi object is an ejectable driver bay1226 *1227 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,1228 * then we can safely call it an ejectable drive bay1229 */1230bool acpi_bay_match(acpi_handle handle)1231{1232 acpi_handle phandle;1233 1234 if (!acpi_has_method(handle, "_EJ0"))1235 return false;1236 if (acpi_ata_match(handle))1237 return true;1238 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))1239 return false;1240 1241 return acpi_ata_match(phandle);1242}1243 1244bool acpi_device_is_battery(struct acpi_device *adev)1245{1246 struct acpi_hardware_id *hwid;1247 1248 list_for_each_entry(hwid, &adev->pnp.ids, list)1249 if (!strcmp("PNP0C0A", hwid->id))1250 return true;1251 1252 return false;1253}1254 1255static bool is_ejectable_bay(struct acpi_device *adev)1256{1257 acpi_handle handle = adev->handle;1258 1259 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))1260 return true;1261 1262 return acpi_bay_match(handle);1263}1264 1265/*1266 * acpi_dock_match - see if an acpi object has a _DCK method1267 */1268bool acpi_dock_match(acpi_handle handle)1269{1270 return acpi_has_method(handle, "_DCK");1271}1272 1273static acpi_status1274acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,1275 void **return_value)1276{1277 long *cap = context;1278 1279 if (acpi_has_method(handle, "_BCM") &&1280 acpi_has_method(handle, "_BCL")) {1281 acpi_handle_debug(handle, "Found generic backlight support\n");1282 *cap |= ACPI_VIDEO_BACKLIGHT;1283 /* We have backlight support, no need to scan further */1284 return AE_CTRL_TERMINATE;1285 }1286 return 0;1287}1288 1289/* Returns true if the ACPI object is a video device which can be1290 * handled by video.ko.1291 * The device will get a Linux specific CID added in scan.c to1292 * identify the device as an ACPI graphics device1293 * Be aware that the graphics device may not be physically present1294 * Use acpi_video_get_capabilities() to detect general ACPI video1295 * capabilities of present cards1296 */1297long acpi_is_video_device(acpi_handle handle)1298{1299 long video_caps = 0;1300 1301 /* Is this device able to support video switching ? */1302 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))1303 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;1304 1305 /* Is this device able to retrieve a video ROM ? */1306 if (acpi_has_method(handle, "_ROM"))1307 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;1308 1309 /* Is this device able to configure which video head to be POSTed ? */1310 if (acpi_has_method(handle, "_VPO") &&1311 acpi_has_method(handle, "_GPD") &&1312 acpi_has_method(handle, "_SPD"))1313 video_caps |= ACPI_VIDEO_DEVICE_POSTING;1314 1315 /* Only check for backlight functionality if one of the above hit. */1316 if (video_caps)1317 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,1318 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,1319 &video_caps, NULL);1320 1321 return video_caps;1322}1323EXPORT_SYMBOL(acpi_is_video_device);1324 1325const char *acpi_device_hid(struct acpi_device *device)1326{1327 struct acpi_hardware_id *hid;1328 1329 hid = list_first_entry_or_null(&device->pnp.ids, struct acpi_hardware_id, list);1330 if (!hid)1331 return dummy_hid;1332 1333 return hid->id;1334}1335EXPORT_SYMBOL(acpi_device_hid);1336 1337static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)1338{1339 struct acpi_hardware_id *id;1340 1341 id = kmalloc(sizeof(*id), GFP_KERNEL);1342 if (!id)1343 return;1344 1345 id->id = kstrdup_const(dev_id, GFP_KERNEL);1346 if (!id->id) {1347 kfree(id);1348 return;1349 }1350 1351 list_add_tail(&id->list, &pnp->ids);1352 pnp->type.hardware_id = 1;1353}1354 1355/*1356 * Old IBM workstations have a DSDT bug wherein the SMBus object1357 * lacks the SMBUS01 HID and the methods do not have the necessary "_"1358 * prefix. Work around this.1359 */1360static bool acpi_ibm_smbus_match(acpi_handle handle)1361{1362 char node_name[ACPI_PATH_SEGMENT_LENGTH];1363 struct acpi_buffer path = { sizeof(node_name), node_name };1364 1365 if (!dmi_name_in_vendors("IBM"))1366 return false;1367 1368 /* Look for SMBS object */1369 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||1370 strcmp("SMBS", path.pointer))1371 return false;1372 1373 /* Does it have the necessary (but misnamed) methods? */1374 if (acpi_has_method(handle, "SBI") &&1375 acpi_has_method(handle, "SBR") &&1376 acpi_has_method(handle, "SBW"))1377 return true;1378 1379 return false;1380}1381 1382static bool acpi_object_is_system_bus(acpi_handle handle)1383{1384 acpi_handle tmp;1385 1386 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&1387 tmp == handle)1388 return true;1389 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&1390 tmp == handle)1391 return true;1392 1393 return false;1394}1395 1396static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,1397 int device_type)1398{1399 struct acpi_device_info *info = NULL;1400 struct acpi_pnp_device_id_list *cid_list;1401 int i;1402 1403 switch (device_type) {1404 case ACPI_BUS_TYPE_DEVICE:1405 if (handle == ACPI_ROOT_OBJECT) {1406 acpi_add_id(pnp, ACPI_SYSTEM_HID);1407 break;1408 }1409 1410 acpi_get_object_info(handle, &info);1411 if (!info) {1412 pr_err("%s: Error reading device info\n", __func__);1413 return;1414 }1415 1416 if (info->valid & ACPI_VALID_HID) {1417 acpi_add_id(pnp, info->hardware_id.string);1418 pnp->type.platform_id = 1;1419 }1420 if (info->valid & ACPI_VALID_CID) {1421 cid_list = &info->compatible_id_list;1422 for (i = 0; i < cid_list->count; i++)1423 acpi_add_id(pnp, cid_list->ids[i].string);1424 }1425 if (info->valid & ACPI_VALID_ADR) {1426 pnp->bus_address = info->address;1427 pnp->type.bus_address = 1;1428 }1429 if (info->valid & ACPI_VALID_UID)1430 pnp->unique_id = kstrdup(info->unique_id.string,1431 GFP_KERNEL);1432 if (info->valid & ACPI_VALID_CLS)1433 acpi_add_id(pnp, info->class_code.string);1434 1435 kfree(info);1436 1437 /*1438 * Some devices don't reliably have _HIDs & _CIDs, so add1439 * synthetic HIDs to make sure drivers can find them.1440 */1441 if (acpi_is_video_device(handle)) {1442 acpi_add_id(pnp, ACPI_VIDEO_HID);1443 pnp->type.backlight = 1;1444 break;1445 }1446 if (acpi_bay_match(handle))1447 acpi_add_id(pnp, ACPI_BAY_HID);1448 else if (acpi_dock_match(handle))1449 acpi_add_id(pnp, ACPI_DOCK_HID);1450 else if (acpi_ibm_smbus_match(handle))1451 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);1452 else if (list_empty(&pnp->ids) &&1453 acpi_object_is_system_bus(handle)) {1454 /* \_SB, \_TZ, LNXSYBUS */1455 acpi_add_id(pnp, ACPI_BUS_HID);1456 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);1457 strcpy(pnp->device_class, ACPI_BUS_CLASS);1458 }1459 1460 break;1461 case ACPI_BUS_TYPE_POWER:1462 acpi_add_id(pnp, ACPI_POWER_HID);1463 break;1464 case ACPI_BUS_TYPE_PROCESSOR:1465 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);1466 break;1467 case ACPI_BUS_TYPE_THERMAL:1468 acpi_add_id(pnp, ACPI_THERMAL_HID);1469 break;1470 case ACPI_BUS_TYPE_POWER_BUTTON:1471 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);1472 break;1473 case ACPI_BUS_TYPE_SLEEP_BUTTON:1474 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);1475 break;1476 case ACPI_BUS_TYPE_ECDT_EC:1477 acpi_add_id(pnp, ACPI_ECDT_HID);1478 break;1479 }1480}1481 1482void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)1483{1484 struct acpi_hardware_id *id, *tmp;1485 1486 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {1487 kfree_const(id->id);1488 kfree(id);1489 }1490 kfree(pnp->unique_id);1491}1492 1493/**1494 * acpi_dma_supported - Check DMA support for the specified device.1495 * @adev: The pointer to acpi device1496 *1497 * Return false if DMA is not supported. Otherwise, return true1498 */1499bool acpi_dma_supported(const struct acpi_device *adev)1500{1501 if (!adev)1502 return false;1503 1504 if (adev->flags.cca_seen)1505 return true;1506 1507 /*1508 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent1509 * DMA on "Intel platforms". Presumably that includes all x86 and1510 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.1511 */1512 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))1513 return true;1514 1515 return false;1516}1517 1518/**1519 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.1520 * @adev: The pointer to acpi device1521 *1522 * Return enum dev_dma_attr.1523 */1524enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)1525{1526 if (!acpi_dma_supported(adev))1527 return DEV_DMA_NOT_SUPPORTED;1528 1529 if (adev->flags.coherent_dma)1530 return DEV_DMA_COHERENT;1531 else1532 return DEV_DMA_NON_COHERENT;1533}1534 1535/**1536 * acpi_dma_get_range() - Get device DMA parameters.1537 *1538 * @dev: device to configure1539 * @map: pointer to DMA ranges result1540 *1541 * Evaluate DMA regions and return pointer to DMA regions on1542 * parsing success; it does not update the passed in values on failure.1543 *1544 * Return 0 on success, < 0 on failure.1545 */1546int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map)1547{1548 struct acpi_device *adev;1549 LIST_HEAD(list);1550 struct resource_entry *rentry;1551 int ret;1552 struct device *dma_dev = dev;1553 struct bus_dma_region *r;1554 1555 /*1556 * Walk the device tree chasing an ACPI companion with a _DMA1557 * object while we go. Stop if we find a device with an ACPI1558 * companion containing a _DMA method.1559 */1560 do {1561 adev = ACPI_COMPANION(dma_dev);1562 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))1563 break;1564 1565 dma_dev = dma_dev->parent;1566 } while (dma_dev);1567 1568 if (!dma_dev)1569 return -ENODEV;1570 1571 if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {1572 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");1573 return -EINVAL;1574 }1575 1576 ret = acpi_dev_get_dma_resources(adev, &list);1577 if (ret > 0) {1578 r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL);1579 if (!r) {1580 ret = -ENOMEM;1581 goto out;1582 }1583 1584 *map = r;1585 1586 list_for_each_entry(rentry, &list, node) {1587 if (rentry->res->start >= rentry->res->end) {1588 kfree(*map);1589 *map = NULL;1590 ret = -EINVAL;1591 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");1592 goto out;1593 }1594 1595 r->cpu_start = rentry->res->start;1596 r->dma_start = rentry->res->start - rentry->offset;1597 r->size = resource_size(rentry->res);1598 r++;1599 }1600 }1601 out:1602 acpi_dev_free_resource_list(&list);1603 1604 return ret >= 0 ? 0 : ret;1605}1606 1607#ifdef CONFIG_IOMMU_API1608int acpi_iommu_fwspec_init(struct device *dev, u32 id,1609 struct fwnode_handle *fwnode)1610{1611 int ret;1612 1613 ret = iommu_fwspec_init(dev, fwnode);1614 if (ret)1615 return ret;1616 1617 return iommu_fwspec_add_ids(dev, &id, 1);1618}1619 1620static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)1621{1622 int err;1623 1624 /* Serialise to make dev->iommu stable under our potential fwspec */1625 mutex_lock(&iommu_probe_device_lock);1626 /* If we already translated the fwspec there is nothing left to do */1627 if (dev_iommu_fwspec_get(dev)) {1628 mutex_unlock(&iommu_probe_device_lock);1629 return 0;1630 }1631 1632 err = iort_iommu_configure_id(dev, id_in);1633 if (err && err != -EPROBE_DEFER)1634 err = viot_iommu_configure(dev);1635 mutex_unlock(&iommu_probe_device_lock);1636 1637 /*1638 * If we have reason to believe the IOMMU driver missed the initial1639 * iommu_probe_device() call for dev, replay it to get things in order.1640 */1641 if (!err && dev->bus)1642 err = iommu_probe_device(dev);1643 1644 return err;1645}1646 1647#else /* !CONFIG_IOMMU_API */1648 1649int acpi_iommu_fwspec_init(struct device *dev, u32 id,1650 struct fwnode_handle *fwnode)1651{1652 return -ENODEV;1653}1654 1655static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)1656{1657 return -ENODEV;1658}1659 1660#endif /* !CONFIG_IOMMU_API */1661 1662/**1663 * acpi_dma_configure_id - Set-up DMA configuration for the device.1664 * @dev: The pointer to the device1665 * @attr: device dma attributes1666 * @input_id: input device id const value pointer1667 */1668int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,1669 const u32 *input_id)1670{1671 int ret;1672 1673 if (attr == DEV_DMA_NOT_SUPPORTED) {1674 set_dma_ops(dev, &dma_dummy_ops);1675 return 0;1676 }1677 1678 acpi_arch_dma_setup(dev);1679 1680 /* Ignore all other errors apart from EPROBE_DEFER */1681 ret = acpi_iommu_configure_id(dev, input_id);1682 if (ret == -EPROBE_DEFER)1683 return -EPROBE_DEFER;1684 if (ret)1685 dev_dbg(dev, "Adding to IOMMU failed: %d\n", ret);1686 1687 arch_setup_dma_ops(dev, attr == DEV_DMA_COHERENT);1688 1689 return 0;1690}1691EXPORT_SYMBOL_GPL(acpi_dma_configure_id);1692 1693static void acpi_init_coherency(struct acpi_device *adev)1694{1695 unsigned long long cca = 0;1696 acpi_status status;1697 struct acpi_device *parent = acpi_dev_parent(adev);1698 1699 if (parent && parent->flags.cca_seen) {1700 /*1701 * From ACPI spec, OSPM will ignore _CCA if an ancestor1702 * already saw one.1703 */1704 adev->flags.cca_seen = 1;1705 cca = parent->flags.coherent_dma;1706 } else {1707 status = acpi_evaluate_integer(adev->handle, "_CCA",1708 NULL, &cca);1709 if (ACPI_SUCCESS(status))1710 adev->flags.cca_seen = 1;1711 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))1712 /*1713 * If architecture does not specify that _CCA is1714 * required for DMA-able devices (e.g. x86),1715 * we default to _CCA=1.1716 */1717 cca = 1;1718 else1719 acpi_handle_debug(adev->handle,1720 "ACPI device is missing _CCA.\n");1721 }1722 1723 adev->flags.coherent_dma = cca;1724}1725 1726static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)1727{1728 bool *is_serial_bus_slave_p = data;1729 1730 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)1731 return 1;1732 1733 *is_serial_bus_slave_p = true;1734 1735 /* no need to do more checking */1736 return -1;1737}1738 1739static bool acpi_is_indirect_io_slave(struct acpi_device *device)1740{1741 struct acpi_device *parent = acpi_dev_parent(device);1742 static const struct acpi_device_id indirect_io_hosts[] = {1743 {"HISI0191", 0},1744 {}1745 };1746 1747 return parent && !acpi_match_device_ids(parent, indirect_io_hosts);1748}1749 1750static bool acpi_device_enumeration_by_parent(struct acpi_device *device)1751{1752 struct list_head resource_list;1753 bool is_serial_bus_slave = false;1754 static const struct acpi_device_id ignore_serial_bus_ids[] = {1755 /*1756 * These devices have multiple SerialBus resources and a client1757 * device must be instantiated for each of them, each with1758 * its own device id.1759 * Normally we only instantiate one client device for the first1760 * resource, using the ACPI HID as id. These special cases are handled1761 * by the drivers/platform/x86/serial-multi-instantiate.c driver, which1762 * knows which client device id to use for each resource.1763 */1764 {"BSG1160", },1765 {"BSG2150", },1766 {"CSC3551", },1767 {"CSC3554", },1768 {"CSC3556", },1769 {"CSC3557", },1770 {"INT33FE", },1771 {"INT3515", },1772 /* Non-conforming _HID for Cirrus Logic already released */1773 {"CLSA0100", },1774 {"CLSA0101", },1775 /*1776 * Some ACPI devs contain SerialBus resources even though they are not1777 * attached to a serial bus at all.1778 */1779 {ACPI_VIDEO_HID, },1780 {"MSHW0028", },1781 /*1782 * HIDs of device with an UartSerialBusV2 resource for which userspace1783 * expects a regular tty cdev to be created (instead of the in kernel1784 * serdev) and which have a kernel driver which expects a platform_dev1785 * such as the rfkill-gpio driver.1786 */1787 {"BCM4752", },1788 {"LNV4752", },1789 {}1790 };1791 1792 if (acpi_is_indirect_io_slave(device))1793 return true;1794 1795 /* Macs use device properties in lieu of _CRS resources */1796 if (x86_apple_machine &&1797 (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||1798 fwnode_property_present(&device->fwnode, "i2cAddress") ||1799 fwnode_property_present(&device->fwnode, "baud")))1800 return true;1801 1802 if (!acpi_match_device_ids(device, ignore_serial_bus_ids))1803 return false;1804 1805 INIT_LIST_HEAD(&resource_list);1806 acpi_dev_get_resources(device, &resource_list,1807 acpi_check_serial_bus_slave,1808 &is_serial_bus_slave);1809 acpi_dev_free_resource_list(&resource_list);1810 1811 return is_serial_bus_slave;1812}1813 1814void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,1815 int type, void (*release)(struct device *))1816{1817 struct acpi_device *parent = acpi_find_parent_acpi_dev(handle);1818 1819 INIT_LIST_HEAD(&device->pnp.ids);1820 device->device_type = type;1821 device->handle = handle;1822 device->dev.parent = parent ? &parent->dev : NULL;1823 device->dev.release = release;1824 device->dev.bus = &acpi_bus_type;1825 device->dev.groups = acpi_groups;1826 fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);1827 acpi_set_device_status(device, ACPI_STA_DEFAULT);1828 acpi_device_get_busid(device);1829 acpi_set_pnp_ids(handle, &device->pnp, type);1830 acpi_init_properties(device);1831 acpi_bus_get_flags(device);1832 device->flags.match_driver = false;1833 device->flags.initialized = true;1834 device->flags.enumeration_by_parent =1835 acpi_device_enumeration_by_parent(device);1836 acpi_device_clear_enumerated(device);1837 device_initialize(&device->dev);1838 dev_set_uevent_suppress(&device->dev, true);1839 acpi_init_coherency(device);1840}1841 1842static void acpi_scan_dep_init(struct acpi_device *adev)1843{1844 struct acpi_dep_data *dep;1845 1846 list_for_each_entry(dep, &acpi_dep_list, node) {1847 if (dep->consumer == adev->handle) {1848 if (dep->honor_dep)1849 adev->flags.honor_deps = 1;1850 1851 if (!dep->met)1852 adev->dep_unmet++;1853 }1854 }1855}1856 1857void acpi_device_add_finalize(struct acpi_device *device)1858{1859 dev_set_uevent_suppress(&device->dev, false);1860 kobject_uevent(&device->dev.kobj, KOBJ_ADD);1861}1862 1863static void acpi_scan_init_status(struct acpi_device *adev)1864{1865 if (acpi_bus_get_status(adev))1866 acpi_set_device_status(adev, 0);1867}1868 1869static int acpi_add_single_object(struct acpi_device **child,1870 acpi_handle handle, int type, bool dep_init)1871{1872 struct acpi_device *device;1873 bool release_dep_lock = false;1874 int result;1875 1876 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);1877 if (!device)1878 return -ENOMEM;1879 1880 acpi_init_device_object(device, handle, type, acpi_device_release);1881 /*1882 * Getting the status is delayed till here so that we can call1883 * acpi_bus_get_status() and use its quirk handling. Note that1884 * this must be done before the get power-/wakeup_dev-flags calls.1885 */1886 if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {1887 if (dep_init) {1888 mutex_lock(&acpi_dep_list_lock);1889 /*1890 * Hold the lock until the acpi_tie_acpi_dev() call1891 * below to prevent concurrent acpi_scan_clear_dep()1892 * from deleting a dependency list entry without1893 * updating dep_unmet for the device.1894 */1895 release_dep_lock = true;1896 acpi_scan_dep_init(device);1897 }1898 acpi_scan_init_status(device);1899 }1900 1901 acpi_bus_get_power_flags(device);1902 acpi_bus_get_wakeup_device_flags(device);1903 1904 result = acpi_tie_acpi_dev(device);1905 1906 if (release_dep_lock)1907 mutex_unlock(&acpi_dep_list_lock);1908 1909 if (!result)1910 result = acpi_device_add(device);1911 1912 if (result) {1913 acpi_device_release(&device->dev);1914 return result;1915 }1916 1917 acpi_power_add_remove_device(device, true);1918 acpi_device_add_finalize(device);1919 1920 acpi_handle_debug(handle, "Added as %s, parent %s\n",1921 dev_name(&device->dev), device->dev.parent ?1922 dev_name(device->dev.parent) : "(null)");1923 1924 *child = device;1925 return 0;1926}1927 1928static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,1929 void *context)1930{1931 struct resource *res = context;1932 1933 if (acpi_dev_resource_memory(ares, res))1934 return AE_CTRL_TERMINATE;1935 1936 return AE_OK;1937}1938 1939static bool acpi_device_should_be_hidden(acpi_handle handle)1940{1941 acpi_status status;1942 struct resource res;1943 1944 /* Check if it should ignore the UART device */1945 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))1946 return false;1947 1948 /*1949 * The UART device described in SPCR table is assumed to have only one1950 * memory resource present. So we only look for the first one here.1951 */1952 status = acpi_walk_resources(handle, METHOD_NAME__CRS,1953 acpi_get_resource_memory, &res);1954 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)1955 return false;1956 1957 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",1958 &res.start);1959 1960 return true;1961}1962 1963bool acpi_device_is_present(const struct acpi_device *adev)1964{1965 return adev->status.present || adev->status.functional;1966}1967 1968bool acpi_device_is_enabled(const struct acpi_device *adev)1969{1970 return adev->status.enabled;1971}1972 1973static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,1974 const char *idstr,1975 const struct acpi_device_id **matchid)1976{1977 const struct acpi_device_id *devid;1978 1979 if (handler->match)1980 return handler->match(idstr, matchid);1981 1982 for (devid = handler->ids; devid->id[0]; devid++)1983 if (!strcmp((char *)devid->id, idstr)) {1984 if (matchid)1985 *matchid = devid;1986 1987 return true;1988 }1989 1990 return false;1991}1992 1993static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,1994 const struct acpi_device_id **matchid)1995{1996 struct acpi_scan_handler *handler;1997 1998 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)1999 if (acpi_scan_handler_matching(handler, idstr, matchid))2000 return handler;2001 2002 return NULL;2003}2004 2005void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)2006{2007 if (!!hotplug->enabled == !!val)2008 return;2009 2010 mutex_lock(&acpi_scan_lock);2011 2012 hotplug->enabled = val;2013 2014 mutex_unlock(&acpi_scan_lock);2015}2016 2017int acpi_scan_add_dep(acpi_handle handle, struct acpi_handle_list *dep_devices)2018{2019 u32 count;2020 int i;2021 2022 for (count = 0, i = 0; i < dep_devices->count; i++) {2023 struct acpi_device_info *info;2024 struct acpi_dep_data *dep;2025 bool skip, honor_dep;2026 acpi_status status;2027 2028 status = acpi_get_object_info(dep_devices->handles[i], &info);2029 if (ACPI_FAILURE(status)) {2030 acpi_handle_debug(handle, "Error reading _DEP device info\n");2031 continue;2032 }2033 2034 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);2035 honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids);2036 kfree(info);2037 2038 if (skip)2039 continue;2040 2041 dep = kzalloc(sizeof(*dep), GFP_KERNEL);2042 if (!dep)2043 continue;2044 2045 count++;2046 2047 dep->supplier = dep_devices->handles[i];2048 dep->consumer = handle;2049 dep->honor_dep = honor_dep;2050 2051 mutex_lock(&acpi_dep_list_lock);2052 list_add_tail(&dep->node, &acpi_dep_list);2053 mutex_unlock(&acpi_dep_list_lock);2054 }2055 2056 acpi_handle_list_free(dep_devices);2057 return count;2058}2059 2060static void acpi_scan_init_hotplug(struct acpi_device *adev)2061{2062 struct acpi_hardware_id *hwid;2063 2064 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {2065 acpi_dock_add(adev);2066 return;2067 }2068 list_for_each_entry(hwid, &adev->pnp.ids, list) {2069 struct acpi_scan_handler *handler;2070 2071 handler = acpi_scan_match_handler(hwid->id, NULL);2072 if (handler) {2073 adev->flags.hotplug_notify = true;2074 break;2075 }2076 }2077}2078 2079u32 __weak arch_acpi_add_auto_dep(acpi_handle handle) { return 0; }2080 2081static u32 acpi_scan_check_dep(acpi_handle handle)2082{2083 struct acpi_handle_list dep_devices;2084 u32 count = 0;2085 2086 /*2087 * Some architectures like RISC-V need to add dependencies for2088 * all devices which use GSI to the interrupt controller so that2089 * interrupt controller is probed before any of those devices.2090 * Instead of mandating _DEP on all the devices, detect the2091 * dependency and add automatically.2092 */2093 count += arch_acpi_add_auto_dep(handle);2094 2095 /*2096 * Check for _HID here to avoid deferring the enumeration of:2097 * 1. PCI devices.2098 * 2. ACPI nodes describing USB ports.2099 * Still, checking for _HID catches more then just these cases ...2100 */2101 if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID"))2102 return count;2103 2104 if (!acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices)) {2105 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");2106 return count;2107 }2108 2109 count += acpi_scan_add_dep(handle, &dep_devices);2110 return count;2111}2112 2113static acpi_status acpi_scan_check_crs_csi2_cb(acpi_handle handle, u32 a, void *b, void **c)2114{2115 acpi_mipi_check_crs_csi2(handle);2116 return AE_OK;2117}2118 2119static acpi_status acpi_bus_check_add(acpi_handle handle, bool first_pass,2120 struct acpi_device **adev_p)2121{2122 struct acpi_device *device = acpi_fetch_acpi_dev(handle);2123 acpi_object_type acpi_type;2124 int type;2125 2126 if (device)2127 goto out;2128 2129 if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))2130 return AE_OK;2131 2132 switch (acpi_type) {2133 case ACPI_TYPE_DEVICE:2134 if (acpi_device_should_be_hidden(handle))2135 return AE_OK;2136 2137 if (first_pass) {2138 acpi_mipi_check_crs_csi2(handle);2139 2140 /* Bail out if there are dependencies. */2141 if (acpi_scan_check_dep(handle) > 0) {2142 /*2143 * The entire CSI-2 connection graph needs to be2144 * extracted before any drivers or scan handlers2145 * are bound to struct device objects, so scan2146 * _CRS CSI-2 resource descriptors for all2147 * devices below the current handle.2148 */2149 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,2150 ACPI_UINT32_MAX,2151 acpi_scan_check_crs_csi2_cb,2152 NULL, NULL, NULL);2153 return AE_CTRL_DEPTH;2154 }2155 }2156 2157 fallthrough;2158 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */2159 type = ACPI_BUS_TYPE_DEVICE;2160 break;2161 2162 case ACPI_TYPE_PROCESSOR:2163 type = ACPI_BUS_TYPE_PROCESSOR;2164 break;2165 2166 case ACPI_TYPE_THERMAL:2167 type = ACPI_BUS_TYPE_THERMAL;2168 break;2169 2170 case ACPI_TYPE_POWER:2171 acpi_add_power_resource(handle);2172 fallthrough;2173 default:2174 return AE_OK;2175 }2176 2177 /*2178 * If first_pass is true at this point, the device has no dependencies,2179 * or the creation of the device object would have been postponed above.2180 */2181 acpi_add_single_object(&device, handle, type, !first_pass);2182 if (!device)2183 return AE_CTRL_DEPTH;2184 2185 acpi_scan_init_hotplug(device);2186 2187out:2188 if (!*adev_p)2189 *adev_p = device;2190 2191 return AE_OK;2192}2193 2194static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,2195 void *not_used, void **ret_p)2196{2197 return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);2198}2199 2200static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,2201 void *not_used, void **ret_p)2202{2203 return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);2204}2205 2206static void acpi_default_enumeration(struct acpi_device *device)2207{2208 /*2209 * Do not enumerate devices with enumeration_by_parent flag set as2210 * they will be enumerated by their respective parents.2211 */2212 if (!device->flags.enumeration_by_parent) {2213 acpi_create_platform_device(device, NULL);2214 acpi_device_set_enumerated(device);2215 } else {2216 blocking_notifier_call_chain(&acpi_reconfig_chain,2217 ACPI_RECONFIG_DEVICE_ADD, device);2218 }2219}2220 2221static const struct acpi_device_id generic_device_ids[] = {2222 {ACPI_DT_NAMESPACE_HID, },2223 {"", },2224};2225 2226static int acpi_generic_device_attach(struct acpi_device *adev,2227 const struct acpi_device_id *not_used)2228{2229 /*2230 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test2231 * below can be unconditional.2232 */2233 if (adev->data.of_compatible)2234 acpi_default_enumeration(adev);2235 2236 return 1;2237}2238 2239static struct acpi_scan_handler generic_device_handler = {2240 .ids = generic_device_ids,2241 .attach = acpi_generic_device_attach,2242};2243 2244static int acpi_scan_attach_handler(struct acpi_device *device)2245{2246 struct acpi_hardware_id *hwid;2247 int ret = 0;2248 2249 list_for_each_entry(hwid, &device->pnp.ids, list) {2250 const struct acpi_device_id *devid;2251 struct acpi_scan_handler *handler;2252 2253 handler = acpi_scan_match_handler(hwid->id, &devid);2254 if (handler) {2255 if (!handler->attach) {2256 device->pnp.type.platform_id = 0;2257 continue;2258 }2259 device->handler = handler;2260 ret = handler->attach(device, devid);2261 if (ret > 0)2262 break;2263 2264 device->handler = NULL;2265 if (ret < 0)2266 break;2267 }2268 }2269 2270 return ret;2271}2272 2273static int acpi_bus_attach(struct acpi_device *device, void *first_pass)2274{2275 bool skip = !first_pass && device->flags.visited;2276 acpi_handle ejd;2277 int ret;2278 2279 if (skip)2280 goto ok;2281 2282 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))2283 register_dock_dependent_device(device, ejd);2284 2285 acpi_bus_get_status(device);2286 /* Skip devices that are not ready for enumeration (e.g. not present) */2287 if (!acpi_dev_ready_for_enumeration(device)) {2288 device->flags.initialized = false;2289 acpi_device_clear_enumerated(device);2290 device->flags.power_manageable = 0;2291 return 0;2292 }2293 if (device->handler)2294 goto ok;2295 2296 acpi_ec_register_opregions(device);2297 2298 if (!device->flags.initialized) {2299 device->flags.power_manageable =2300 device->power.states[ACPI_STATE_D0].flags.valid;2301 if (acpi_bus_init_power(device))2302 device->flags.power_manageable = 0;2303 2304 device->flags.initialized = true;2305 } else if (device->flags.visited) {2306 goto ok;2307 }2308 2309 ret = acpi_scan_attach_handler(device);2310 if (ret < 0)2311 return 0;2312 2313 device->flags.match_driver = true;2314 if (ret > 0 && !device->flags.enumeration_by_parent) {2315 acpi_device_set_enumerated(device);2316 goto ok;2317 }2318 2319 ret = device_attach(&device->dev);2320 if (ret < 0)2321 return 0;2322 2323 if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)2324 acpi_default_enumeration(device);2325 else2326 acpi_device_set_enumerated(device);2327 2328ok:2329 acpi_dev_for_each_child(device, acpi_bus_attach, first_pass);2330 2331 if (!skip && device->handler && device->handler->hotplug.notify_online)2332 device->handler->hotplug.notify_online(device);2333 2334 return 0;2335}2336 2337static int acpi_dev_get_next_consumer_dev_cb(struct acpi_dep_data *dep, void *data)2338{2339 struct acpi_device **adev_p = data;2340 struct acpi_device *adev = *adev_p;2341 2342 /*2343 * If we're passed a 'previous' consumer device then we need to skip2344 * any consumers until we meet the previous one, and then NULL @data2345 * so the next one can be returned.2346 */2347 if (adev) {2348 if (dep->consumer == adev->handle)2349 *adev_p = NULL;2350 2351 return 0;2352 }2353 2354 adev = acpi_get_acpi_dev(dep->consumer);2355 if (adev) {2356 *(struct acpi_device **)data = adev;2357 return 1;2358 }2359 /* Continue parsing if the device object is not present. */2360 return 0;2361}2362 2363struct acpi_scan_clear_dep_work {2364 struct work_struct work;2365 struct acpi_device *adev;2366};2367 2368static void acpi_scan_clear_dep_fn(struct work_struct *work)2369{2370 struct acpi_scan_clear_dep_work *cdw;2371 2372 cdw = container_of(work, struct acpi_scan_clear_dep_work, work);2373 2374 acpi_scan_lock_acquire();2375 acpi_bus_attach(cdw->adev, (void *)true);2376 acpi_scan_lock_release();2377 2378 acpi_dev_put(cdw->adev);2379 kfree(cdw);2380}2381 2382static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)2383{2384 struct acpi_scan_clear_dep_work *cdw;2385 2386 if (adev->dep_unmet)2387 return false;2388 2389 cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);2390 if (!cdw)2391 return false;2392 2393 cdw->adev = adev;2394 INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);2395 /*2396 * Since the work function may block on the lock until the entire2397 * initial enumeration of devices is complete, put it into the unbound2398 * workqueue.2399 */2400 queue_work(system_unbound_wq, &cdw->work);2401 2402 return true;2403}2404 2405static void acpi_scan_delete_dep_data(struct acpi_dep_data *dep)2406{2407 list_del(&dep->node);2408 kfree(dep);2409}2410 2411static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)2412{2413 struct acpi_device *adev = acpi_get_acpi_dev(dep->consumer);2414 2415 if (adev) {2416 adev->dep_unmet--;2417 if (!acpi_scan_clear_dep_queue(adev))2418 acpi_dev_put(adev);2419 }2420 2421 if (dep->free_when_met)2422 acpi_scan_delete_dep_data(dep);2423 else2424 dep->met = true;2425 2426 return 0;2427}2428 2429/**2430 * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list2431 * @handle: The ACPI handle of the supplier device2432 * @callback: Pointer to the callback function to apply2433 * @data: Pointer to some data to pass to the callback2434 *2435 * The return value of the callback determines this function's behaviour. If 02436 * is returned we continue to iterate over acpi_dep_list. If a positive value2437 * is returned then the loop is broken but this function returns 0. If a2438 * negative value is returned by the callback then the loop is broken and that2439 * value is returned as the final error.2440 */2441static int acpi_walk_dep_device_list(acpi_handle handle,2442 int (*callback)(struct acpi_dep_data *, void *),2443 void *data)2444{2445 struct acpi_dep_data *dep, *tmp;2446 int ret = 0;2447 2448 mutex_lock(&acpi_dep_list_lock);2449 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {2450 if (dep->supplier == handle) {2451 ret = callback(dep, data);2452 if (ret)2453 break;2454 }2455 }2456 mutex_unlock(&acpi_dep_list_lock);2457 2458 return ret > 0 ? 0 : ret;2459}2460 2461/**2462 * acpi_dev_clear_dependencies - Inform consumers that the device is now active2463 * @supplier: Pointer to the supplier &struct acpi_device2464 *2465 * Clear dependencies on the given device.2466 */2467void acpi_dev_clear_dependencies(struct acpi_device *supplier)2468{2469 acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);2470}2471EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);2472 2473/**2474 * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration2475 * @device: Pointer to the &struct acpi_device to check2476 *2477 * Check if the device is present and has no unmet dependencies.2478 *2479 * Return true if the device is ready for enumeratino. Otherwise, return false.2480 */2481bool acpi_dev_ready_for_enumeration(const struct acpi_device *device)2482{2483 if (device->flags.honor_deps && device->dep_unmet)2484 return false;2485 2486 return acpi_device_is_present(device);2487}2488EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);2489 2490/**2491 * acpi_dev_get_next_consumer_dev - Return the next adev dependent on @supplier2492 * @supplier: Pointer to the dependee device2493 * @start: Pointer to the current dependent device2494 *2495 * Returns the next &struct acpi_device which declares itself dependent on2496 * @supplier via the _DEP buffer, parsed from the acpi_dep_list.2497 *2498 * If the returned adev is not passed as @start to this function, the caller is2499 * responsible for putting the reference to adev when it is no longer needed.2500 */2501struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier,2502 struct acpi_device *start)2503{2504 struct acpi_device *adev = start;2505 2506 acpi_walk_dep_device_list(supplier->handle,2507 acpi_dev_get_next_consumer_dev_cb, &adev);2508 2509 acpi_dev_put(start);2510 2511 if (adev == start)2512 return NULL;2513 2514 return adev;2515}2516EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev);2517 2518static void acpi_scan_postponed_branch(acpi_handle handle)2519{2520 struct acpi_device *adev = NULL;2521 2522 if (ACPI_FAILURE(acpi_bus_check_add(handle, false, &adev)))2523 return;2524 2525 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,2526 acpi_bus_check_add_2, NULL, NULL, (void **)&adev);2527 2528 /*2529 * Populate the ACPI _CRS CSI-2 software nodes for the ACPI devices that2530 * have been added above.2531 */2532 acpi_mipi_init_crs_csi2_swnodes();2533 2534 acpi_bus_attach(adev, NULL);2535}2536 2537static void acpi_scan_postponed(void)2538{2539 struct acpi_dep_data *dep, *tmp;2540 2541 mutex_lock(&acpi_dep_list_lock);2542 2543 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {2544 acpi_handle handle = dep->consumer;2545 2546 /*2547 * In case there are multiple acpi_dep_list entries with the2548 * same consumer, skip the current entry if the consumer device2549 * object corresponding to it is present already.2550 */2551 if (!acpi_fetch_acpi_dev(handle)) {2552 /*2553 * Even though the lock is released here, tmp is2554 * guaranteed to be valid, because none of the list2555 * entries following dep is marked as "free when met"2556 * and so they cannot be deleted.2557 */2558 mutex_unlock(&acpi_dep_list_lock);2559 2560 acpi_scan_postponed_branch(handle);2561 2562 mutex_lock(&acpi_dep_list_lock);2563 }2564 2565 if (dep->met)2566 acpi_scan_delete_dep_data(dep);2567 else2568 dep->free_when_met = true;2569 }2570 2571 mutex_unlock(&acpi_dep_list_lock);2572}2573 2574/**2575 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.2576 * @handle: Root of the namespace scope to scan.2577 *2578 * Scan a given ACPI tree (probably recently hot-plugged) and create and add2579 * found devices.2580 *2581 * If no devices were found, -ENODEV is returned, but it does not mean that2582 * there has been a real error. There just have been no suitable ACPI objects2583 * in the table trunk from which the kernel could create a device and add an2584 * appropriate driver.2585 *2586 * Must be called under acpi_scan_lock.2587 */2588int acpi_bus_scan(acpi_handle handle)2589{2590 struct acpi_device *device = NULL;2591 2592 /* Pass 1: Avoid enumerating devices with missing dependencies. */2593 2594 if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))2595 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,2596 acpi_bus_check_add_1, NULL, NULL,2597 (void **)&device);2598 2599 if (!device)2600 return -ENODEV;2601 2602 /*2603 * Set up ACPI _CRS CSI-2 software nodes using information extracted2604 * from the _CRS CSI-2 resource descriptors during the ACPI namespace2605 * walk above and MIPI DisCo for Imaging device properties.2606 */2607 acpi_mipi_scan_crs_csi2();2608 acpi_mipi_init_crs_csi2_swnodes();2609 2610 acpi_bus_attach(device, (void *)true);2611 2612 /* Pass 2: Enumerate all of the remaining devices. */2613 2614 acpi_scan_postponed();2615 2616 acpi_mipi_crs_csi2_cleanup();2617 2618 return 0;2619}2620EXPORT_SYMBOL(acpi_bus_scan);2621 2622/**2623 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.2624 * @adev: Root of the ACPI namespace scope to walk.2625 *2626 * Must be called under acpi_scan_lock.2627 */2628void acpi_bus_trim(struct acpi_device *adev)2629{2630 uintptr_t flags = 0;2631 2632 acpi_scan_check_and_detach(adev, (void *)flags);2633}2634EXPORT_SYMBOL_GPL(acpi_bus_trim);2635 2636int acpi_bus_register_early_device(int type)2637{2638 struct acpi_device *device = NULL;2639 int result;2640 2641 result = acpi_add_single_object(&device, NULL, type, false);2642 if (result)2643 return result;2644 2645 device->flags.match_driver = true;2646 return device_attach(&device->dev);2647}2648EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);2649 2650static void acpi_bus_scan_fixed(void)2651{2652 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {2653 struct acpi_device *adev = NULL;2654 2655 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON,2656 false);2657 if (adev) {2658 adev->flags.match_driver = true;2659 if (device_attach(&adev->dev) >= 0)2660 device_init_wakeup(&adev->dev, true);2661 else2662 dev_dbg(&adev->dev, "No driver\n");2663 }2664 }2665 2666 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {2667 struct acpi_device *adev = NULL;2668 2669 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON,2670 false);2671 if (adev) {2672 adev->flags.match_driver = true;2673 if (device_attach(&adev->dev) < 0)2674 dev_dbg(&adev->dev, "No driver\n");2675 }2676 }2677}2678 2679static void __init acpi_get_spcr_uart_addr(void)2680{2681 acpi_status status;2682 struct acpi_table_spcr *spcr_ptr;2683 2684 status = acpi_get_table(ACPI_SIG_SPCR, 0,2685 (struct acpi_table_header **)&spcr_ptr);2686 if (ACPI_FAILURE(status)) {2687 pr_warn("STAO table present, but SPCR is missing\n");2688 return;2689 }2690 2691 spcr_uart_addr = spcr_ptr->serial_port.address;2692 acpi_put_table((struct acpi_table_header *)spcr_ptr);2693}2694 2695static bool acpi_scan_initialized;2696 2697void __init acpi_scan_init(void)2698{2699 acpi_status status;2700 struct acpi_table_stao *stao_ptr;2701 2702 acpi_pci_root_init();2703 acpi_pci_link_init();2704 acpi_processor_init();2705 acpi_platform_init();2706 acpi_lpss_init();2707 acpi_apd_init();2708 acpi_cmos_rtc_init();2709 acpi_container_init();2710 acpi_memory_hotplug_init();2711 acpi_watchdog_init();2712 acpi_pnp_init();2713 acpi_int340x_thermal_init();2714 acpi_init_lpit();2715 2716 acpi_scan_add_handler(&generic_device_handler);2717 2718 /*2719 * If there is STAO table, check whether it needs to ignore the UART2720 * device in SPCR table.2721 */2722 status = acpi_get_table(ACPI_SIG_STAO, 0,2723 (struct acpi_table_header **)&stao_ptr);2724 if (ACPI_SUCCESS(status)) {2725 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))2726 pr_info("STAO Name List not yet supported.\n");2727 2728 if (stao_ptr->ignore_uart)2729 acpi_get_spcr_uart_addr();2730 2731 acpi_put_table((struct acpi_table_header *)stao_ptr);2732 }2733 2734 acpi_gpe_apply_masked_gpes();2735 acpi_update_all_gpes();2736 2737 /*2738 * Although we call __add_memory() that is documented to require the2739 * device_hotplug_lock, it is not necessary here because this is an2740 * early code when userspace or any other code path cannot trigger2741 * hotplug/hotunplug operations.2742 */2743 mutex_lock(&acpi_scan_lock);2744 /*2745 * Enumerate devices in the ACPI namespace.2746 */2747 if (acpi_bus_scan(ACPI_ROOT_OBJECT))2748 goto unlock;2749 2750 acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);2751 if (!acpi_root)2752 goto unlock;2753 2754 /* Fixed feature devices do not exist on HW-reduced platform */2755 if (!acpi_gbl_reduced_hardware)2756 acpi_bus_scan_fixed();2757 2758 acpi_turn_off_unused_power_resources();2759 2760 acpi_scan_initialized = true;2761 2762unlock:2763 mutex_unlock(&acpi_scan_lock);2764}2765 2766static struct acpi_probe_entry *ape;2767static int acpi_probe_count;2768static DEFINE_MUTEX(acpi_probe_mutex);2769 2770static int __init acpi_match_madt(union acpi_subtable_headers *header,2771 const unsigned long end)2772{2773 if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))2774 if (!ape->probe_subtbl(header, end))2775 acpi_probe_count++;2776 2777 return 0;2778}2779 2780void __weak arch_sort_irqchip_probe(struct acpi_probe_entry *ap_head, int nr) { }2781 2782int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)2783{2784 int count = 0;2785 2786 if (acpi_disabled)2787 return 0;2788 2789 mutex_lock(&acpi_probe_mutex);2790 arch_sort_irqchip_probe(ap_head, nr);2791 for (ape = ap_head; nr; ape++, nr--) {2792 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {2793 acpi_probe_count = 0;2794 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);2795 count += acpi_probe_count;2796 } else {2797 int res;2798 res = acpi_table_parse(ape->id, ape->probe_table);2799 if (!res)2800 count++;2801 }2802 }2803 mutex_unlock(&acpi_probe_mutex);2804 2805 return count;2806}2807 2808static void acpi_table_events_fn(struct work_struct *work)2809{2810 acpi_scan_lock_acquire();2811 acpi_bus_scan(ACPI_ROOT_OBJECT);2812 acpi_scan_lock_release();2813 2814 kfree(work);2815}2816 2817void acpi_scan_table_notify(void)2818{2819 struct work_struct *work;2820 2821 if (!acpi_scan_initialized)2822 return;2823 2824 work = kmalloc(sizeof(*work), GFP_KERNEL);2825 if (!work)2826 return;2827 2828 INIT_WORK(work, acpi_table_events_fn);2829 schedule_work(work);2830}2831 2832int acpi_reconfig_notifier_register(struct notifier_block *nb)2833{2834 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);2835}2836EXPORT_SYMBOL(acpi_reconfig_notifier_register);2837 2838int acpi_reconfig_notifier_unregister(struct notifier_block *nb)2839{2840 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);2841}2842EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);2843