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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * scan.c - support for transforming the ACPI namespace into individual objects
- */
- #define pr_fmt(fmt) "ACPI: " fmt
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <linux/kernel.h>
- #include <linux/acpi.h>
- #include <linux/acpi_iort.h>
- #include <linux/acpi_viot.h>
- #include <linux/iommu.h>
- #include <linux/signal.h>
- #include <linux/kthread.h>
- #include <linux/dmi.h>
- #include <linux/dma-map-ops.h>
- #include <linux/platform_data/x86/apple.h>
- #include <linux/pgtable.h>
- #include <linux/crc32.h>
- #include <linux/dma-direct.h>
- #include "internal.h"
- extern struct acpi_device *acpi_root;
- #define ACPI_BUS_CLASS "system_bus"
- #define ACPI_BUS_HID "LNXSYBUS"
- #define ACPI_BUS_DEVICE_NAME "System Bus"
- #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
- static const char *dummy_hid = "device";
- static LIST_HEAD(acpi_dep_list);
- static DEFINE_MUTEX(acpi_dep_list_lock);
- LIST_HEAD(acpi_bus_id_list);
- static DEFINE_MUTEX(acpi_scan_lock);
- static LIST_HEAD(acpi_scan_handlers_list);
- DEFINE_MUTEX(acpi_device_lock);
- LIST_HEAD(acpi_wakeup_device_list);
- static DEFINE_MUTEX(acpi_hp_context_lock);
- /*
- * The UART device described by the SPCR table is the only object which needs
- * special-casing. Everything else is covered by ACPI namespace paths in STAO
- * table.
- */
- static u64 spcr_uart_addr;
- void acpi_scan_lock_acquire(void)
- {
- mutex_lock(&acpi_scan_lock);
- }
- EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
- void acpi_scan_lock_release(void)
- {
- mutex_unlock(&acpi_scan_lock);
- }
- EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
- void acpi_lock_hp_context(void)
- {
- mutex_lock(&acpi_hp_context_lock);
- }
- void acpi_unlock_hp_context(void)
- {
- mutex_unlock(&acpi_hp_context_lock);
- }
- void acpi_initialize_hp_context(struct acpi_device *adev,
- struct acpi_hotplug_context *hp,
- int (*notify)(struct acpi_device *, u32),
- void (*uevent)(struct acpi_device *, u32))
- {
- acpi_lock_hp_context();
- hp->notify = notify;
- hp->uevent = uevent;
- acpi_set_hp_context(adev, hp);
- acpi_unlock_hp_context();
- }
- EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
- int acpi_scan_add_handler(struct acpi_scan_handler *handler)
- {
- if (!handler)
- return -EINVAL;
- list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
- return 0;
- }
- int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
- const char *hotplug_profile_name)
- {
- int error;
- error = acpi_scan_add_handler(handler);
- if (error)
- return error;
- acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
- return 0;
- }
- bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
- {
- struct acpi_device_physical_node *pn;
- bool offline = true;
- char *envp[] = { "EVENT=offline", NULL };
- /*
- * acpi_container_offline() calls this for all of the container's
- * children under the container's physical_node_lock lock.
- */
- mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
- list_for_each_entry(pn, &adev->physical_node_list, node)
- if (device_supports_offline(pn->dev) && !pn->dev->offline) {
- if (uevent)
- kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
- offline = false;
- break;
- }
- mutex_unlock(&adev->physical_node_lock);
- return offline;
- }
- static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
- void **ret_p)
- {
- struct acpi_device *device = acpi_fetch_acpi_dev(handle);
- struct acpi_device_physical_node *pn;
- bool second_pass = (bool)data;
- acpi_status status = AE_OK;
- if (!device)
- return AE_OK;
- if (device->handler && !device->handler->hotplug.enabled) {
- *ret_p = &device->dev;
- return AE_SUPPORT;
- }
- mutex_lock(&device->physical_node_lock);
- list_for_each_entry(pn, &device->physical_node_list, node) {
- int ret;
- if (second_pass) {
- /* Skip devices offlined by the first pass. */
- if (pn->put_online)
- continue;
- } else {
- pn->put_online = false;
- }
- ret = device_offline(pn->dev);
- if (ret >= 0) {
- pn->put_online = !ret;
- } else {
- *ret_p = pn->dev;
- if (second_pass) {
- status = AE_ERROR;
- break;
- }
- }
- }
- mutex_unlock(&device->physical_node_lock);
- return status;
- }
- static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
- void **ret_p)
- {
- struct acpi_device *device = acpi_fetch_acpi_dev(handle);
- struct acpi_device_physical_node *pn;
- if (!device)
- return AE_OK;
- mutex_lock(&device->physical_node_lock);
- list_for_each_entry(pn, &device->physical_node_list, node)
- if (pn->put_online) {
- device_online(pn->dev);
- pn->put_online = false;
- }
- mutex_unlock(&device->physical_node_lock);
- return AE_OK;
- }
- static int acpi_scan_try_to_offline(struct acpi_device *device)
- {
- acpi_handle handle = device->handle;
- struct device *errdev = NULL;
- acpi_status status;
- /*
- * Carry out two passes here and ignore errors in the first pass,
- * because if the devices in question are memory blocks and
- * CONFIG_MEMCG is set, one of the blocks may hold data structures
- * that the other blocks depend on, but it is not known in advance which
- * block holds them.
- *
- * If the first pass is successful, the second one isn't needed, though.
- */
- status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
- NULL, acpi_bus_offline, (void *)false,
- (void **)&errdev);
- if (status == AE_SUPPORT) {
- dev_warn(errdev, "Offline disabled.\n");
- acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
- acpi_bus_online, NULL, NULL, NULL);
- return -EPERM;
- }
- acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
- if (errdev) {
- errdev = NULL;
- acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
- NULL, acpi_bus_offline, (void *)true,
- (void **)&errdev);
- if (!errdev)
- acpi_bus_offline(handle, 0, (void *)true,
- (void **)&errdev);
- if (errdev) {
- dev_warn(errdev, "Offline failed.\n");
- acpi_bus_online(handle, 0, NULL, NULL);
- acpi_walk_namespace(ACPI_TYPE_ANY, handle,
- ACPI_UINT32_MAX, acpi_bus_online,
- NULL, NULL, NULL);
- return -EBUSY;
- }
- }
- return 0;
- }
- static int acpi_scan_hot_remove(struct acpi_device *device)
- {
- acpi_handle handle = device->handle;
- unsigned long long sta;
- acpi_status status;
- if (device->handler && device->handler->hotplug.demand_offline) {
- if (!acpi_scan_is_offline(device, true))
- return -EBUSY;
- } else {
- int error = acpi_scan_try_to_offline(device);
- if (error)
- return error;
- }
- acpi_handle_debug(handle, "Ejecting\n");
- acpi_bus_trim(device);
- acpi_evaluate_lck(handle, 0);
- /*
- * TBD: _EJD support.
- */
- status = acpi_evaluate_ej0(handle);
- if (status == AE_NOT_FOUND)
- return -ENODEV;
- else if (ACPI_FAILURE(status))
- return -EIO;
- /*
- * Verify if eject was indeed successful. If not, log an error
- * message. No need to call _OST since _EJ0 call was made OK.
- */
- status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
- if (ACPI_FAILURE(status)) {
- acpi_handle_warn(handle,
- "Status check after eject failed (0x%x)\n", status);
- } else if (sta & ACPI_STA_DEVICE_ENABLED) {
- acpi_handle_warn(handle,
- "Eject incomplete - status 0x%llx\n", sta);
- }
- return 0;
- }
- static int acpi_scan_device_not_present(struct acpi_device *adev)
- {
- if (!acpi_device_enumerated(adev)) {
- dev_warn(&adev->dev, "Still not present\n");
- return -EALREADY;
- }
- acpi_bus_trim(adev);
- return 0;
- }
- static int acpi_scan_device_check(struct acpi_device *adev)
- {
- int error;
- acpi_bus_get_status(adev);
- if (adev->status.present || adev->status.functional) {
- /*
- * This function is only called for device objects for which
- * matching scan handlers exist. The only situation in which
- * the scan handler is not attached to this device object yet
- * is when the device has just appeared (either it wasn't
- * present at all before or it was removed and then added
- * again).
- */
- if (adev->handler) {
- dev_warn(&adev->dev, "Already enumerated\n");
- return -EALREADY;
- }
- error = acpi_bus_scan(adev->handle);
- if (error) {
- dev_warn(&adev->dev, "Namespace scan failure\n");
- return error;
- }
- if (!adev->handler) {
- dev_warn(&adev->dev, "Enumeration failure\n");
- error = -ENODEV;
- }
- } else {
- error = acpi_scan_device_not_present(adev);
- }
- return error;
- }
- static int acpi_scan_bus_check(struct acpi_device *adev, void *not_used)
- {
- struct acpi_scan_handler *handler = adev->handler;
- int error;
- acpi_bus_get_status(adev);
- if (!(adev->status.present || adev->status.functional)) {
- acpi_scan_device_not_present(adev);
- return 0;
- }
- if (handler && handler->hotplug.scan_dependent)
- return handler->hotplug.scan_dependent(adev);
- error = acpi_bus_scan(adev->handle);
- if (error) {
- dev_warn(&adev->dev, "Namespace scan failure\n");
- return error;
- }
- return acpi_dev_for_each_child(adev, acpi_scan_bus_check, NULL);
- }
- static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
- {
- switch (type) {
- case ACPI_NOTIFY_BUS_CHECK:
- return acpi_scan_bus_check(adev, NULL);
- case ACPI_NOTIFY_DEVICE_CHECK:
- return acpi_scan_device_check(adev);
- case ACPI_NOTIFY_EJECT_REQUEST:
- case ACPI_OST_EC_OSPM_EJECT:
- if (adev->handler && !adev->handler->hotplug.enabled) {
- dev_info(&adev->dev, "Eject disabled\n");
- return -EPERM;
- }
- acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
- ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
- return acpi_scan_hot_remove(adev);
- }
- return -EINVAL;
- }
- void acpi_device_hotplug(struct acpi_device *adev, u32 src)
- {
- u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
- int error = -ENODEV;
- lock_device_hotplug();
- mutex_lock(&acpi_scan_lock);
- /*
- * The device object's ACPI handle cannot become invalid as long as we
- * are holding acpi_scan_lock, but it might have become invalid before
- * that lock was acquired.
- */
- if (adev->handle == INVALID_ACPI_HANDLE)
- goto err_out;
- if (adev->flags.is_dock_station) {
- error = dock_notify(adev, src);
- } else if (adev->flags.hotplug_notify) {
- error = acpi_generic_hotplug_event(adev, src);
- } else {
- int (*notify)(struct acpi_device *, u32);
- acpi_lock_hp_context();
- notify = adev->hp ? adev->hp->notify : NULL;
- acpi_unlock_hp_context();
- /*
- * There may be additional notify handlers for device objects
- * without the .event() callback, so ignore them here.
- */
- if (notify)
- error = notify(adev, src);
- else
- goto out;
- }
- switch (error) {
- case 0:
- ost_code = ACPI_OST_SC_SUCCESS;
- break;
- case -EPERM:
- ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
- break;
- case -EBUSY:
- ost_code = ACPI_OST_SC_DEVICE_BUSY;
- break;
- default:
- ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
- break;
- }
- err_out:
- acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
- out:
- acpi_put_acpi_dev(adev);
- mutex_unlock(&acpi_scan_lock);
- unlock_device_hotplug();
- }
- static void acpi_free_power_resources_lists(struct acpi_device *device)
- {
- int i;
- if (device->wakeup.flags.valid)
- acpi_power_resources_list_free(&device->wakeup.resources);
- if (!device->power.flags.power_resources)
- return;
- for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
- struct acpi_device_power_state *ps = &device->power.states[i];
- acpi_power_resources_list_free(&ps->resources);
- }
- }
- static void acpi_device_release(struct device *dev)
- {
- struct acpi_device *acpi_dev = to_acpi_device(dev);
- acpi_free_properties(acpi_dev);
- acpi_free_pnp_ids(&acpi_dev->pnp);
- acpi_free_power_resources_lists(acpi_dev);
- kfree(acpi_dev);
- }
- static void acpi_device_del(struct acpi_device *device)
- {
- struct acpi_device_bus_id *acpi_device_bus_id;
- mutex_lock(&acpi_device_lock);
- list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
- if (!strcmp(acpi_device_bus_id->bus_id,
- acpi_device_hid(device))) {
- ida_free(&acpi_device_bus_id->instance_ida,
- device->pnp.instance_no);
- if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
- list_del(&acpi_device_bus_id->node);
- kfree_const(acpi_device_bus_id->bus_id);
- kfree(acpi_device_bus_id);
- }
- break;
- }
- list_del(&device->wakeup_list);
- mutex_unlock(&acpi_device_lock);
- acpi_power_add_remove_device(device, false);
- acpi_device_remove_files(device);
- if (device->remove)
- device->remove(device);
- device_del(&device->dev);
- }
- static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
- static LIST_HEAD(acpi_device_del_list);
- static DEFINE_MUTEX(acpi_device_del_lock);
- static void acpi_device_del_work_fn(struct work_struct *work_not_used)
- {
- for (;;) {
- struct acpi_device *adev;
- mutex_lock(&acpi_device_del_lock);
- if (list_empty(&acpi_device_del_list)) {
- mutex_unlock(&acpi_device_del_lock);
- break;
- }
- adev = list_first_entry(&acpi_device_del_list,
- struct acpi_device, del_list);
- list_del(&adev->del_list);
- mutex_unlock(&acpi_device_del_lock);
- blocking_notifier_call_chain(&acpi_reconfig_chain,
- ACPI_RECONFIG_DEVICE_REMOVE, adev);
- acpi_device_del(adev);
- /*
- * Drop references to all power resources that might have been
- * used by the device.
- */
- acpi_power_transition(adev, ACPI_STATE_D3_COLD);
- acpi_dev_put(adev);
- }
- }
- /**
- * acpi_scan_drop_device - Drop an ACPI device object.
- * @handle: Handle of an ACPI namespace node, not used.
- * @context: Address of the ACPI device object to drop.
- *
- * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
- * namespace node the device object pointed to by @context is attached to.
- *
- * The unregistration is carried out asynchronously to avoid running
- * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
- * ensure the correct ordering (the device objects must be unregistered in the
- * same order in which the corresponding namespace nodes are deleted).
- */
- static void acpi_scan_drop_device(acpi_handle handle, void *context)
- {
- static DECLARE_WORK(work, acpi_device_del_work_fn);
- struct acpi_device *adev = context;
- mutex_lock(&acpi_device_del_lock);
- /*
- * Use the ACPI hotplug workqueue which is ordered, so this work item
- * won't run after any hotplug work items submitted subsequently. That
- * prevents attempts to register device objects identical to those being
- * deleted from happening concurrently (such attempts result from
- * hotplug events handled via the ACPI hotplug workqueue). It also will
- * run after all of the work items submitted previously, which helps
- * those work items to ensure that they are not accessing stale device
- * objects.
- */
- if (list_empty(&acpi_device_del_list))
- acpi_queue_hotplug_work(&work);
- list_add_tail(&adev->del_list, &acpi_device_del_list);
- /* Make acpi_ns_validate_handle() return NULL for this handle. */
- adev->handle = INVALID_ACPI_HANDLE;
- mutex_unlock(&acpi_device_del_lock);
- }
- static struct acpi_device *handle_to_device(acpi_handle handle,
- void (*callback)(void *))
- {
- struct acpi_device *adev = NULL;
- acpi_status status;
- status = acpi_get_data_full(handle, acpi_scan_drop_device,
- (void **)&adev, callback);
- if (ACPI_FAILURE(status) || !adev) {
- acpi_handle_debug(handle, "No context!\n");
- return NULL;
- }
- return adev;
- }
- /**
- * acpi_fetch_acpi_dev - Retrieve ACPI device object.
- * @handle: ACPI handle associated with the requested ACPI device object.
- *
- * Return a pointer to the ACPI device object associated with @handle, if
- * present, or NULL otherwise.
- */
- struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)
- {
- return handle_to_device(handle, NULL);
- }
- EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);
- static void get_acpi_device(void *dev)
- {
- acpi_dev_get(dev);
- }
- /**
- * acpi_get_acpi_dev - Retrieve ACPI device object and reference count it.
- * @handle: ACPI handle associated with the requested ACPI device object.
- *
- * Return a pointer to the ACPI device object associated with @handle and bump
- * up that object's reference counter (under the ACPI Namespace lock), if
- * present, or return NULL otherwise.
- *
- * The ACPI device object reference acquired by this function needs to be
- * dropped via acpi_dev_put().
- */
- struct acpi_device *acpi_get_acpi_dev(acpi_handle handle)
- {
- return handle_to_device(handle, get_acpi_device);
- }
- EXPORT_SYMBOL_GPL(acpi_get_acpi_dev);
- static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
- {
- struct acpi_device_bus_id *acpi_device_bus_id;
- /* Find suitable bus_id and instance number in acpi_bus_id_list. */
- list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
- if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
- return acpi_device_bus_id;
- }
- return NULL;
- }
- static int acpi_device_set_name(struct acpi_device *device,
- struct acpi_device_bus_id *acpi_device_bus_id)
- {
- struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
- int result;
- result = ida_alloc(instance_ida, GFP_KERNEL);
- if (result < 0)
- return result;
- device->pnp.instance_no = result;
- dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
- return 0;
- }
- int acpi_tie_acpi_dev(struct acpi_device *adev)
- {
- acpi_handle handle = adev->handle;
- acpi_status status;
- if (!handle)
- return 0;
- status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
- if (ACPI_FAILURE(status)) {
- acpi_handle_err(handle, "Unable to attach device data\n");
- return -ENODEV;
- }
- return 0;
- }
- static void acpi_store_pld_crc(struct acpi_device *adev)
- {
- struct acpi_pld_info *pld;
- acpi_status status;
- status = acpi_get_physical_device_location(adev->handle, &pld);
- if (ACPI_FAILURE(status))
- return;
- adev->pld_crc = crc32(~0, pld, sizeof(*pld));
- ACPI_FREE(pld);
- }
- int acpi_device_add(struct acpi_device *device)
- {
- struct acpi_device_bus_id *acpi_device_bus_id;
- int result;
- /*
- * Linkage
- * -------
- * Link this device to its parent and siblings.
- */
- INIT_LIST_HEAD(&device->wakeup_list);
- INIT_LIST_HEAD(&device->physical_node_list);
- INIT_LIST_HEAD(&device->del_list);
- mutex_init(&device->physical_node_lock);
- mutex_lock(&acpi_device_lock);
- acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
- if (acpi_device_bus_id) {
- result = acpi_device_set_name(device, acpi_device_bus_id);
- if (result)
- goto err_unlock;
- } else {
- acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
- GFP_KERNEL);
- if (!acpi_device_bus_id) {
- result = -ENOMEM;
- goto err_unlock;
- }
- acpi_device_bus_id->bus_id =
- kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
- if (!acpi_device_bus_id->bus_id) {
- kfree(acpi_device_bus_id);
- result = -ENOMEM;
- goto err_unlock;
- }
- ida_init(&acpi_device_bus_id->instance_ida);
- result = acpi_device_set_name(device, acpi_device_bus_id);
- if (result) {
- kfree_const(acpi_device_bus_id->bus_id);
- kfree(acpi_device_bus_id);
- goto err_unlock;
- }
- list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
- }
- if (device->wakeup.flags.valid)
- list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
- acpi_store_pld_crc(device);
- mutex_unlock(&acpi_device_lock);
- result = device_add(&device->dev);
- if (result) {
- dev_err(&device->dev, "Error registering device\n");
- goto err;
- }
- result = acpi_device_setup_files(device);
- if (result)
- pr_err("Error creating sysfs interface for device %s\n",
- dev_name(&device->dev));
- return 0;
- err:
- mutex_lock(&acpi_device_lock);
- list_del(&device->wakeup_list);
- err_unlock:
- mutex_unlock(&acpi_device_lock);
- acpi_detach_data(device->handle, acpi_scan_drop_device);
- return result;
- }
- /* --------------------------------------------------------------------------
- Device Enumeration
- -------------------------------------------------------------------------- */
- static bool acpi_info_matches_ids(struct acpi_device_info *info,
- const char * const ids[])
- {
- struct acpi_pnp_device_id_list *cid_list = NULL;
- int i, index;
- if (!(info->valid & ACPI_VALID_HID))
- return false;
- index = match_string(ids, -1, info->hardware_id.string);
- if (index >= 0)
- return true;
- if (info->valid & ACPI_VALID_CID)
- cid_list = &info->compatible_id_list;
- if (!cid_list)
- return false;
- for (i = 0; i < cid_list->count; i++) {
- index = match_string(ids, -1, cid_list->ids[i].string);
- if (index >= 0)
- return true;
- }
- return false;
- }
- /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
- static const char * const acpi_ignore_dep_ids[] = {
- "PNP0D80", /* Windows-compatible System Power Management Controller */
- "INT33BD", /* Intel Baytrail Mailbox Device */
- "LATT2021", /* Lattice FW Update Client Driver */
- NULL
- };
- /* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */
- static const char * const acpi_honor_dep_ids[] = {
- "INT3472", /* Camera sensor PMIC / clk and regulator info */
- NULL
- };
- static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle)
- {
- struct acpi_device *adev;
- /*
- * Fixed hardware devices do not appear in the namespace and do not
- * have handles, but we fabricate acpi_devices for them, so we have
- * to deal with them specially.
- */
- if (!handle)
- return acpi_root;
- do {
- acpi_status status;
- status = acpi_get_parent(handle, &handle);
- if (ACPI_FAILURE(status)) {
- if (status != AE_NULL_ENTRY)
- return acpi_root;
- return NULL;
- }
- adev = acpi_fetch_acpi_dev(handle);
- } while (!adev);
- return adev;
- }
- acpi_status
- acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
- {
- acpi_status status;
- acpi_handle tmp;
- struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
- union acpi_object *obj;
- status = acpi_get_handle(handle, "_EJD", &tmp);
- if (ACPI_FAILURE(status))
- return status;
- status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
- if (ACPI_SUCCESS(status)) {
- obj = buffer.pointer;
- status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
- ejd);
- kfree(buffer.pointer);
- }
- return status;
- }
- EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
- static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
- {
- acpi_handle handle = dev->handle;
- struct acpi_device_wakeup *wakeup = &dev->wakeup;
- struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
- union acpi_object *package = NULL;
- union acpi_object *element = NULL;
- acpi_status status;
- int err = -ENODATA;
- INIT_LIST_HEAD(&wakeup->resources);
- /* _PRW */
- status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
- if (ACPI_FAILURE(status)) {
- acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
- acpi_format_exception(status));
- return err;
- }
- package = (union acpi_object *)buffer.pointer;
- if (!package || package->package.count < 2)
- goto out;
- element = &(package->package.elements[0]);
- if (!element)
- goto out;
- if (element->type == ACPI_TYPE_PACKAGE) {
- if ((element->package.count < 2) ||
- (element->package.elements[0].type !=
- ACPI_TYPE_LOCAL_REFERENCE)
- || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
- goto out;
- wakeup->gpe_device =
- element->package.elements[0].reference.handle;
- wakeup->gpe_number =
- (u32) element->package.elements[1].integer.value;
- } else if (element->type == ACPI_TYPE_INTEGER) {
- wakeup->gpe_device = NULL;
- wakeup->gpe_number = element->integer.value;
- } else {
- goto out;
- }
- element = &(package->package.elements[1]);
- if (element->type != ACPI_TYPE_INTEGER)
- goto out;
- wakeup->sleep_state = element->integer.value;
- err = acpi_extract_power_resources(package, 2, &wakeup->resources);
- if (err)
- goto out;
- if (!list_empty(&wakeup->resources)) {
- int sleep_state;
- err = acpi_power_wakeup_list_init(&wakeup->resources,
- &sleep_state);
- if (err) {
- acpi_handle_warn(handle, "Retrieving current states "
- "of wakeup power resources failed\n");
- acpi_power_resources_list_free(&wakeup->resources);
- goto out;
- }
- if (sleep_state < wakeup->sleep_state) {
- acpi_handle_warn(handle, "Overriding _PRW sleep state "
- "(S%d) by S%d from power resources\n",
- (int)wakeup->sleep_state, sleep_state);
- wakeup->sleep_state = sleep_state;
- }
- }
- out:
- kfree(buffer.pointer);
- return err;
- }
- static bool acpi_wakeup_gpe_init(struct acpi_device *device)
- {
- static const struct acpi_device_id button_device_ids[] = {
- {"PNP0C0C", 0}, /* Power button */
- {"PNP0C0D", 0}, /* Lid */
- {"PNP0C0E", 0}, /* Sleep button */
- {"", 0},
- };
- struct acpi_device_wakeup *wakeup = &device->wakeup;
- acpi_status status;
- wakeup->flags.notifier_present = 0;
- /* Power button, Lid switch always enable wakeup */
- if (!acpi_match_device_ids(device, button_device_ids)) {
- if (!acpi_match_device_ids(device, &button_device_ids[1])) {
- /* Do not use Lid/sleep button for S5 wakeup */
- if (wakeup->sleep_state == ACPI_STATE_S5)
- wakeup->sleep_state = ACPI_STATE_S4;
- }
- acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
- device_set_wakeup_capable(&device->dev, true);
- return true;
- }
- status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
- wakeup->gpe_number);
- return ACPI_SUCCESS(status);
- }
- static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
- {
- int err;
- /* Presence of _PRW indicates wake capable */
- if (!acpi_has_method(device->handle, "_PRW"))
- return;
- err = acpi_bus_extract_wakeup_device_power_package(device);
- if (err) {
- dev_err(&device->dev, "Unable to extract wakeup power resources");
- return;
- }
- device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
- device->wakeup.prepare_count = 0;
- /*
- * Call _PSW/_DSW object to disable its ability to wake the sleeping
- * system for the ACPI device with the _PRW object.
- * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
- * So it is necessary to call _DSW object first. Only when it is not
- * present will the _PSW object used.
- */
- err = acpi_device_sleep_wake(device, 0, 0, 0);
- if (err)
- pr_debug("error in _DSW or _PSW evaluation\n");
- }
- static void acpi_bus_init_power_state(struct acpi_device *device, int state)
- {
- struct acpi_device_power_state *ps = &device->power.states[state];
- char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
- struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
- acpi_status status;
- INIT_LIST_HEAD(&ps->resources);
- /* Evaluate "_PRx" to get referenced power resources */
- status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
- if (ACPI_SUCCESS(status)) {
- union acpi_object *package = buffer.pointer;
- if (buffer.length && package
- && package->type == ACPI_TYPE_PACKAGE
- && package->package.count)
- acpi_extract_power_resources(package, 0, &ps->resources);
- ACPI_FREE(buffer.pointer);
- }
- /* Evaluate "_PSx" to see if we can do explicit sets */
- pathname[2] = 'S';
- if (acpi_has_method(device->handle, pathname))
- ps->flags.explicit_set = 1;
- /* State is valid if there are means to put the device into it. */
- if (!list_empty(&ps->resources) || ps->flags.explicit_set)
- ps->flags.valid = 1;
- ps->power = -1; /* Unknown - driver assigned */
- ps->latency = -1; /* Unknown - driver assigned */
- }
- static void acpi_bus_get_power_flags(struct acpi_device *device)
- {
- unsigned long long dsc = ACPI_STATE_D0;
- u32 i;
- /* Presence of _PS0|_PR0 indicates 'power manageable' */
- if (!acpi_has_method(device->handle, "_PS0") &&
- !acpi_has_method(device->handle, "_PR0"))
- return;
- device->flags.power_manageable = 1;
- /*
- * Power Management Flags
- */
- if (acpi_has_method(device->handle, "_PSC"))
- device->power.flags.explicit_get = 1;
- if (acpi_has_method(device->handle, "_IRC"))
- device->power.flags.inrush_current = 1;
- if (acpi_has_method(device->handle, "_DSW"))
- device->power.flags.dsw_present = 1;
- acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc);
- device->power.state_for_enumeration = dsc;
- /*
- * Enumerate supported power management states
- */
- for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
- acpi_bus_init_power_state(device, i);
- INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
- /* Set the defaults for D0 and D3hot (always supported). */
- device->power.states[ACPI_STATE_D0].flags.valid = 1;
- device->power.states[ACPI_STATE_D0].power = 100;
- device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
- /*
- * Use power resources only if the D0 list of them is populated, because
- * some platforms may provide _PR3 only to indicate D3cold support and
- * in those cases the power resources list returned by it may be bogus.
- */
- if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
- device->power.flags.power_resources = 1;
- /*
- * D3cold is supported if the D3hot list of power resources is
- * not empty.
- */
- if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
- device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
- }
- if (acpi_bus_init_power(device))
- device->flags.power_manageable = 0;
- }
- static void acpi_bus_get_flags(struct acpi_device *device)
- {
- /* Presence of _STA indicates 'dynamic_status' */
- if (acpi_has_method(device->handle, "_STA"))
- device->flags.dynamic_status = 1;
- /* Presence of _RMV indicates 'removable' */
- if (acpi_has_method(device->handle, "_RMV"))
- device->flags.removable = 1;
- /* Presence of _EJD|_EJ0 indicates 'ejectable' */
- if (acpi_has_method(device->handle, "_EJD") ||
- acpi_has_method(device->handle, "_EJ0"))
- device->flags.ejectable = 1;
- }
- static void acpi_device_get_busid(struct acpi_device *device)
- {
- char bus_id[5] = { '?', 0 };
- struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
- int i = 0;
- /*
- * Bus ID
- * ------
- * The device's Bus ID is simply the object name.
- * TBD: Shouldn't this value be unique (within the ACPI namespace)?
- */
- if (!acpi_dev_parent(device)) {
- strcpy(device->pnp.bus_id, "ACPI");
- return;
- }
- switch (device->device_type) {
- case ACPI_BUS_TYPE_POWER_BUTTON:
- strcpy(device->pnp.bus_id, "PWRF");
- break;
- case ACPI_BUS_TYPE_SLEEP_BUTTON:
- strcpy(device->pnp.bus_id, "SLPF");
- break;
- case ACPI_BUS_TYPE_ECDT_EC:
- strcpy(device->pnp.bus_id, "ECDT");
- break;
- default:
- acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
- /* Clean up trailing underscores (if any) */
- for (i = 3; i > 1; i--) {
- if (bus_id[i] == '_')
- bus_id[i] = '\0';
- else
- break;
- }
- strcpy(device->pnp.bus_id, bus_id);
- break;
- }
- }
- /*
- * acpi_ata_match - see if an acpi object is an ATA device
- *
- * If an acpi object has one of the ACPI ATA methods defined,
- * then we can safely call it an ATA device.
- */
- bool acpi_ata_match(acpi_handle handle)
- {
- return acpi_has_method(handle, "_GTF") ||
- acpi_has_method(handle, "_GTM") ||
- acpi_has_method(handle, "_STM") ||
- acpi_has_method(handle, "_SDD");
- }
- /*
- * acpi_bay_match - see if an acpi object is an ejectable driver bay
- *
- * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
- * then we can safely call it an ejectable drive bay
- */
- bool acpi_bay_match(acpi_handle handle)
- {
- acpi_handle phandle;
- if (!acpi_has_method(handle, "_EJ0"))
- return false;
- if (acpi_ata_match(handle))
- return true;
- if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
- return false;
- return acpi_ata_match(phandle);
- }
- bool acpi_device_is_battery(struct acpi_device *adev)
- {
- struct acpi_hardware_id *hwid;
- list_for_each_entry(hwid, &adev->pnp.ids, list)
- if (!strcmp("PNP0C0A", hwid->id))
- return true;
- return false;
- }
- static bool is_ejectable_bay(struct acpi_device *adev)
- {
- acpi_handle handle = adev->handle;
- if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
- return true;
- return acpi_bay_match(handle);
- }
- /*
- * acpi_dock_match - see if an acpi object has a _DCK method
- */
- bool acpi_dock_match(acpi_handle handle)
- {
- return acpi_has_method(handle, "_DCK");
- }
- static acpi_status
- acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
- void **return_value)
- {
- long *cap = context;
- if (acpi_has_method(handle, "_BCM") &&
- acpi_has_method(handle, "_BCL")) {
- acpi_handle_debug(handle, "Found generic backlight support\n");
- *cap |= ACPI_VIDEO_BACKLIGHT;
- /* We have backlight support, no need to scan further */
- return AE_CTRL_TERMINATE;
- }
- return 0;
- }
- /* Returns true if the ACPI object is a video device which can be
- * handled by video.ko.
- * The device will get a Linux specific CID added in scan.c to
- * identify the device as an ACPI graphics device
- * Be aware that the graphics device may not be physically present
- * Use acpi_video_get_capabilities() to detect general ACPI video
- * capabilities of present cards
- */
- long acpi_is_video_device(acpi_handle handle)
- {
- long video_caps = 0;
- /* Is this device able to support video switching ? */
- if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
- video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
- /* Is this device able to retrieve a video ROM ? */
- if (acpi_has_method(handle, "_ROM"))
- video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
- /* Is this device able to configure which video head to be POSTed ? */
- if (acpi_has_method(handle, "_VPO") &&
- acpi_has_method(handle, "_GPD") &&
- acpi_has_method(handle, "_SPD"))
- video_caps |= ACPI_VIDEO_DEVICE_POSTING;
- /* Only check for backlight functionality if one of the above hit. */
- if (video_caps)
- acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
- ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
- &video_caps, NULL);
- return video_caps;
- }
- EXPORT_SYMBOL(acpi_is_video_device);
- const char *acpi_device_hid(struct acpi_device *device)
- {
- struct acpi_hardware_id *hid;
- if (list_empty(&device->pnp.ids))
- return dummy_hid;
- hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
- return hid->id;
- }
- EXPORT_SYMBOL(acpi_device_hid);
- static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
- {
- struct acpi_hardware_id *id;
- id = kmalloc(sizeof(*id), GFP_KERNEL);
- if (!id)
- return;
- id->id = kstrdup_const(dev_id, GFP_KERNEL);
- if (!id->id) {
- kfree(id);
- return;
- }
- list_add_tail(&id->list, &pnp->ids);
- pnp->type.hardware_id = 1;
- }
- /*
- * Old IBM workstations have a DSDT bug wherein the SMBus object
- * lacks the SMBUS01 HID and the methods do not have the necessary "_"
- * prefix. Work around this.
- */
- static bool acpi_ibm_smbus_match(acpi_handle handle)
- {
- char node_name[ACPI_PATH_SEGMENT_LENGTH];
- struct acpi_buffer path = { sizeof(node_name), node_name };
- if (!dmi_name_in_vendors("IBM"))
- return false;
- /* Look for SMBS object */
- if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
- strcmp("SMBS", path.pointer))
- return false;
- /* Does it have the necessary (but misnamed) methods? */
- if (acpi_has_method(handle, "SBI") &&
- acpi_has_method(handle, "SBR") &&
- acpi_has_method(handle, "SBW"))
- return true;
- return false;
- }
- static bool acpi_object_is_system_bus(acpi_handle handle)
- {
- acpi_handle tmp;
- if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
- tmp == handle)
- return true;
- if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
- tmp == handle)
- return true;
- return false;
- }
- static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
- int device_type)
- {
- struct acpi_device_info *info = NULL;
- struct acpi_pnp_device_id_list *cid_list;
- int i;
- switch (device_type) {
- case ACPI_BUS_TYPE_DEVICE:
- if (handle == ACPI_ROOT_OBJECT) {
- acpi_add_id(pnp, ACPI_SYSTEM_HID);
- break;
- }
- acpi_get_object_info(handle, &info);
- if (!info) {
- pr_err("%s: Error reading device info\n", __func__);
- return;
- }
- if (info->valid & ACPI_VALID_HID) {
- acpi_add_id(pnp, info->hardware_id.string);
- pnp->type.platform_id = 1;
- }
- if (info->valid & ACPI_VALID_CID) {
- cid_list = &info->compatible_id_list;
- for (i = 0; i < cid_list->count; i++)
- acpi_add_id(pnp, cid_list->ids[i].string);
- }
- if (info->valid & ACPI_VALID_ADR) {
- pnp->bus_address = info->address;
- pnp->type.bus_address = 1;
- }
- if (info->valid & ACPI_VALID_UID)
- pnp->unique_id = kstrdup(info->unique_id.string,
- GFP_KERNEL);
- if (info->valid & ACPI_VALID_CLS)
- acpi_add_id(pnp, info->class_code.string);
- kfree(info);
- /*
- * Some devices don't reliably have _HIDs & _CIDs, so add
- * synthetic HIDs to make sure drivers can find them.
- */
- if (acpi_is_video_device(handle)) {
- acpi_add_id(pnp, ACPI_VIDEO_HID);
- pnp->type.backlight = 1;
- break;
- }
- if (acpi_bay_match(handle))
- acpi_add_id(pnp, ACPI_BAY_HID);
- else if (acpi_dock_match(handle))
- acpi_add_id(pnp, ACPI_DOCK_HID);
- else if (acpi_ibm_smbus_match(handle))
- acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
- else if (list_empty(&pnp->ids) &&
- acpi_object_is_system_bus(handle)) {
- /* \_SB, \_TZ, LNXSYBUS */
- acpi_add_id(pnp, ACPI_BUS_HID);
- strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
- strcpy(pnp->device_class, ACPI_BUS_CLASS);
- }
- break;
- case ACPI_BUS_TYPE_POWER:
- acpi_add_id(pnp, ACPI_POWER_HID);
- break;
- case ACPI_BUS_TYPE_PROCESSOR:
- acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
- break;
- case ACPI_BUS_TYPE_THERMAL:
- acpi_add_id(pnp, ACPI_THERMAL_HID);
- break;
- case ACPI_BUS_TYPE_POWER_BUTTON:
- acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
- break;
- case ACPI_BUS_TYPE_SLEEP_BUTTON:
- acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
- break;
- case ACPI_BUS_TYPE_ECDT_EC:
- acpi_add_id(pnp, ACPI_ECDT_HID);
- break;
- }
- }
- void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
- {
- struct acpi_hardware_id *id, *tmp;
- list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
- kfree_const(id->id);
- kfree(id);
- }
- kfree(pnp->unique_id);
- }
- /**
- * acpi_dma_supported - Check DMA support for the specified device.
- * @adev: The pointer to acpi device
- *
- * Return false if DMA is not supported. Otherwise, return true
- */
- bool acpi_dma_supported(const struct acpi_device *adev)
- {
- if (!adev)
- return false;
- if (adev->flags.cca_seen)
- return true;
- /*
- * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
- * DMA on "Intel platforms". Presumably that includes all x86 and
- * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
- */
- if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
- return true;
- return false;
- }
- /**
- * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
- * @adev: The pointer to acpi device
- *
- * Return enum dev_dma_attr.
- */
- enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
- {
- if (!acpi_dma_supported(adev))
- return DEV_DMA_NOT_SUPPORTED;
- if (adev->flags.coherent_dma)
- return DEV_DMA_COHERENT;
- else
- return DEV_DMA_NON_COHERENT;
- }
- /**
- * acpi_dma_get_range() - Get device DMA parameters.
- *
- * @dev: device to configure
- * @map: pointer to DMA ranges result
- *
- * Evaluate DMA regions and return pointer to DMA regions on
- * parsing success; it does not update the passed in values on failure.
- *
- * Return 0 on success, < 0 on failure.
- */
- int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map)
- {
- struct acpi_device *adev;
- LIST_HEAD(list);
- struct resource_entry *rentry;
- int ret;
- struct device *dma_dev = dev;
- struct bus_dma_region *r;
- /*
- * Walk the device tree chasing an ACPI companion with a _DMA
- * object while we go. Stop if we find a device with an ACPI
- * companion containing a _DMA method.
- */
- do {
- adev = ACPI_COMPANION(dma_dev);
- if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
- break;
- dma_dev = dma_dev->parent;
- } while (dma_dev);
- if (!dma_dev)
- return -ENODEV;
- if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
- acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
- return -EINVAL;
- }
- ret = acpi_dev_get_dma_resources(adev, &list);
- if (ret > 0) {
- r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL);
- if (!r) {
- ret = -ENOMEM;
- goto out;
- }
- *map = r;
- list_for_each_entry(rentry, &list, node) {
- if (rentry->res->start >= rentry->res->end) {
- kfree(*map);
- *map = NULL;
- ret = -EINVAL;
- dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
- goto out;
- }
- r->cpu_start = rentry->res->start;
- r->dma_start = rentry->res->start - rentry->offset;
- r->size = resource_size(rentry->res);
- r->offset = rentry->offset;
- r++;
- }
- }
- out:
- acpi_dev_free_resource_list(&list);
- return ret >= 0 ? 0 : ret;
- }
- #ifdef CONFIG_IOMMU_API
- int acpi_iommu_fwspec_init(struct device *dev, u32 id,
- struct fwnode_handle *fwnode,
- const struct iommu_ops *ops)
- {
- int ret = iommu_fwspec_init(dev, fwnode, ops);
- if (!ret)
- ret = iommu_fwspec_add_ids(dev, &id, 1);
- return ret;
- }
- static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
- {
- struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
- return fwspec ? fwspec->ops : NULL;
- }
- static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
- const u32 *id_in)
- {
- int err;
- const struct iommu_ops *ops;
- /* Serialise to make dev->iommu stable under our potential fwspec */
- mutex_lock(&iommu_probe_device_lock);
- /*
- * If we already translated the fwspec there is nothing left to do,
- * return the iommu_ops.
- */
- ops = acpi_iommu_fwspec_ops(dev);
- if (ops) {
- mutex_unlock(&iommu_probe_device_lock);
- return ops;
- }
- err = iort_iommu_configure_id(dev, id_in);
- if (err && err != -EPROBE_DEFER)
- err = viot_iommu_configure(dev);
- mutex_unlock(&iommu_probe_device_lock);
- /*
- * If we have reason to believe the IOMMU driver missed the initial
- * iommu_probe_device() call for dev, replay it to get things in order.
- */
- if (!err && dev->bus && !device_iommu_mapped(dev))
- err = iommu_probe_device(dev);
- /* Ignore all other errors apart from EPROBE_DEFER */
- if (err == -EPROBE_DEFER) {
- return ERR_PTR(err);
- } else if (err) {
- dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
- return NULL;
- }
- return acpi_iommu_fwspec_ops(dev);
- }
- #else /* !CONFIG_IOMMU_API */
- int acpi_iommu_fwspec_init(struct device *dev, u32 id,
- struct fwnode_handle *fwnode,
- const struct iommu_ops *ops)
- {
- return -ENODEV;
- }
- static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
- const u32 *id_in)
- {
- return NULL;
- }
- #endif /* !CONFIG_IOMMU_API */
- /**
- * acpi_dma_configure_id - Set-up DMA configuration for the device.
- * @dev: The pointer to the device
- * @attr: device dma attributes
- * @input_id: input device id const value pointer
- */
- int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
- const u32 *input_id)
- {
- const struct iommu_ops *iommu;
- if (attr == DEV_DMA_NOT_SUPPORTED) {
- set_dma_ops(dev, &dma_dummy_ops);
- return 0;
- }
- acpi_arch_dma_setup(dev);
- iommu = acpi_iommu_configure_id(dev, input_id);
- if (PTR_ERR(iommu) == -EPROBE_DEFER)
- return -EPROBE_DEFER;
- arch_setup_dma_ops(dev, 0, U64_MAX,
- iommu, attr == DEV_DMA_COHERENT);
- return 0;
- }
- EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
- static void acpi_init_coherency(struct acpi_device *adev)
- {
- unsigned long long cca = 0;
- acpi_status status;
- struct acpi_device *parent = acpi_dev_parent(adev);
- if (parent && parent->flags.cca_seen) {
- /*
- * From ACPI spec, OSPM will ignore _CCA if an ancestor
- * already saw one.
- */
- adev->flags.cca_seen = 1;
- cca = parent->flags.coherent_dma;
- } else {
- status = acpi_evaluate_integer(adev->handle, "_CCA",
- NULL, &cca);
- if (ACPI_SUCCESS(status))
- adev->flags.cca_seen = 1;
- else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
- /*
- * If architecture does not specify that _CCA is
- * required for DMA-able devices (e.g. x86),
- * we default to _CCA=1.
- */
- cca = 1;
- else
- acpi_handle_debug(adev->handle,
- "ACPI device is missing _CCA.\n");
- }
- adev->flags.coherent_dma = cca;
- }
- static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
- {
- bool *is_serial_bus_slave_p = data;
- if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
- return 1;
- *is_serial_bus_slave_p = true;
- /* no need to do more checking */
- return -1;
- }
- static bool acpi_is_indirect_io_slave(struct acpi_device *device)
- {
- struct acpi_device *parent = acpi_dev_parent(device);
- static const struct acpi_device_id indirect_io_hosts[] = {
- {"HISI0191", 0},
- {}
- };
- return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
- }
- static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
- {
- struct list_head resource_list;
- bool is_serial_bus_slave = false;
- static const struct acpi_device_id ignore_serial_bus_ids[] = {
- /*
- * These devices have multiple SerialBus resources and a client
- * device must be instantiated for each of them, each with
- * its own device id.
- * Normally we only instantiate one client device for the first
- * resource, using the ACPI HID as id. These special cases are handled
- * by the drivers/platform/x86/serial-multi-instantiate.c driver, which
- * knows which client device id to use for each resource.
- */
- {"BSG1160", },
- {"BSG2150", },
- {"CSC3551", },
- {"CSC3556", },
- {"INT33FE", },
- {"INT3515", },
- /* Non-conforming _HID for Cirrus Logic already released */
- {"CLSA0100", },
- {"CLSA0101", },
- /*
- * Some ACPI devs contain SerialBus resources even though they are not
- * attached to a serial bus at all.
- */
- {"MSHW0028", },
- /*
- * HIDs of device with an UartSerialBusV2 resource for which userspace
- * expects a regular tty cdev to be created (instead of the in kernel
- * serdev) and which have a kernel driver which expects a platform_dev
- * such as the rfkill-gpio driver.
- */
- {"BCM4752", },
- {"LNV4752", },
- {}
- };
- if (acpi_is_indirect_io_slave(device))
- return true;
- /* Macs use device properties in lieu of _CRS resources */
- if (x86_apple_machine &&
- (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
- fwnode_property_present(&device->fwnode, "i2cAddress") ||
- fwnode_property_present(&device->fwnode, "baud")))
- return true;
- if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
- return false;
- INIT_LIST_HEAD(&resource_list);
- acpi_dev_get_resources(device, &resource_list,
- acpi_check_serial_bus_slave,
- &is_serial_bus_slave);
- acpi_dev_free_resource_list(&resource_list);
- return is_serial_bus_slave;
- }
- void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
- int type, void (*release)(struct device *))
- {
- struct acpi_device *parent = acpi_find_parent_acpi_dev(handle);
- INIT_LIST_HEAD(&device->pnp.ids);
- device->device_type = type;
- device->handle = handle;
- device->dev.parent = parent ? &parent->dev : NULL;
- device->dev.release = release;
- device->dev.bus = &acpi_bus_type;
- fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
- acpi_set_device_status(device, ACPI_STA_DEFAULT);
- acpi_device_get_busid(device);
- acpi_set_pnp_ids(handle, &device->pnp, type);
- acpi_init_properties(device);
- acpi_bus_get_flags(device);
- device->flags.match_driver = false;
- device->flags.initialized = true;
- device->flags.enumeration_by_parent =
- acpi_device_enumeration_by_parent(device);
- acpi_device_clear_enumerated(device);
- device_initialize(&device->dev);
- dev_set_uevent_suppress(&device->dev, true);
- acpi_init_coherency(device);
- }
- static void acpi_scan_dep_init(struct acpi_device *adev)
- {
- struct acpi_dep_data *dep;
- list_for_each_entry(dep, &acpi_dep_list, node) {
- if (dep->consumer == adev->handle) {
- if (dep->honor_dep)
- adev->flags.honor_deps = 1;
- adev->dep_unmet++;
- }
- }
- }
- void acpi_device_add_finalize(struct acpi_device *device)
- {
- dev_set_uevent_suppress(&device->dev, false);
- kobject_uevent(&device->dev.kobj, KOBJ_ADD);
- }
- static void acpi_scan_init_status(struct acpi_device *adev)
- {
- if (acpi_bus_get_status(adev))
- acpi_set_device_status(adev, 0);
- }
- static int acpi_add_single_object(struct acpi_device **child,
- acpi_handle handle, int type, bool dep_init)
- {
- struct acpi_device *device;
- bool release_dep_lock = false;
- int result;
- device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
- if (!device)
- return -ENOMEM;
- acpi_init_device_object(device, handle, type, acpi_device_release);
- /*
- * Getting the status is delayed till here so that we can call
- * acpi_bus_get_status() and use its quirk handling. Note that
- * this must be done before the get power-/wakeup_dev-flags calls.
- */
- if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
- if (dep_init) {
- mutex_lock(&acpi_dep_list_lock);
- /*
- * Hold the lock until the acpi_tie_acpi_dev() call
- * below to prevent concurrent acpi_scan_clear_dep()
- * from deleting a dependency list entry without
- * updating dep_unmet for the device.
- */
- release_dep_lock = true;
- acpi_scan_dep_init(device);
- }
- acpi_scan_init_status(device);
- }
- acpi_bus_get_power_flags(device);
- acpi_bus_get_wakeup_device_flags(device);
- result = acpi_tie_acpi_dev(device);
- if (release_dep_lock)
- mutex_unlock(&acpi_dep_list_lock);
- if (!result)
- result = acpi_device_add(device);
- if (result) {
- acpi_device_release(&device->dev);
- return result;
- }
- acpi_power_add_remove_device(device, true);
- acpi_device_add_finalize(device);
- acpi_handle_debug(handle, "Added as %s, parent %s\n",
- dev_name(&device->dev), device->dev.parent ?
- dev_name(device->dev.parent) : "(null)");
- *child = device;
- return 0;
- }
- static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
- void *context)
- {
- struct resource *res = context;
- if (acpi_dev_resource_memory(ares, res))
- return AE_CTRL_TERMINATE;
- return AE_OK;
- }
- static bool acpi_device_should_be_hidden(acpi_handle handle)
- {
- acpi_status status;
- struct resource res;
- /* Check if it should ignore the UART device */
- if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
- return false;
- /*
- * The UART device described in SPCR table is assumed to have only one
- * memory resource present. So we only look for the first one here.
- */
- status = acpi_walk_resources(handle, METHOD_NAME__CRS,
- acpi_get_resource_memory, &res);
- if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
- return false;
- acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
- &res.start);
- return true;
- }
- bool acpi_device_is_present(const struct acpi_device *adev)
- {
- return adev->status.present || adev->status.functional;
- }
- static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
- const char *idstr,
- const struct acpi_device_id **matchid)
- {
- const struct acpi_device_id *devid;
- if (handler->match)
- return handler->match(idstr, matchid);
- for (devid = handler->ids; devid->id[0]; devid++)
- if (!strcmp((char *)devid->id, idstr)) {
- if (matchid)
- *matchid = devid;
- return true;
- }
- return false;
- }
- static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
- const struct acpi_device_id **matchid)
- {
- struct acpi_scan_handler *handler;
- list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
- if (acpi_scan_handler_matching(handler, idstr, matchid))
- return handler;
- return NULL;
- }
- void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
- {
- if (!!hotplug->enabled == !!val)
- return;
- mutex_lock(&acpi_scan_lock);
- hotplug->enabled = val;
- mutex_unlock(&acpi_scan_lock);
- }
- static void acpi_scan_init_hotplug(struct acpi_device *adev)
- {
- struct acpi_hardware_id *hwid;
- if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
- acpi_dock_add(adev);
- return;
- }
- list_for_each_entry(hwid, &adev->pnp.ids, list) {
- struct acpi_scan_handler *handler;
- handler = acpi_scan_match_handler(hwid->id, NULL);
- if (handler) {
- adev->flags.hotplug_notify = true;
- break;
- }
- }
- }
- static u32 acpi_scan_check_dep(acpi_handle handle, bool check_dep)
- {
- struct acpi_handle_list dep_devices;
- acpi_status status;
- u32 count;
- int i;
- /*
- * Check for _HID here to avoid deferring the enumeration of:
- * 1. PCI devices.
- * 2. ACPI nodes describing USB ports.
- * Still, checking for _HID catches more then just these cases ...
- */
- if (!check_dep || !acpi_has_method(handle, "_DEP") ||
- !acpi_has_method(handle, "_HID"))
- return 0;
- status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices);
- if (ACPI_FAILURE(status)) {
- acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
- return 0;
- }
- for (count = 0, i = 0; i < dep_devices.count; i++) {
- struct acpi_device_info *info;
- struct acpi_dep_data *dep;
- bool skip, honor_dep;
- status = acpi_get_object_info(dep_devices.handles[i], &info);
- if (ACPI_FAILURE(status)) {
- acpi_handle_debug(handle, "Error reading _DEP device info\n");
- continue;
- }
- skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
- honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids);
- kfree(info);
- if (skip)
- continue;
- dep = kzalloc(sizeof(*dep), GFP_KERNEL);
- if (!dep)
- continue;
- count++;
- dep->supplier = dep_devices.handles[i];
- dep->consumer = handle;
- dep->honor_dep = honor_dep;
- mutex_lock(&acpi_dep_list_lock);
- list_add_tail(&dep->node , &acpi_dep_list);
- mutex_unlock(&acpi_dep_list_lock);
- }
- return count;
- }
- static bool acpi_bus_scan_second_pass;
- static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep,
- struct acpi_device **adev_p)
- {
- struct acpi_device *device = acpi_fetch_acpi_dev(handle);
- acpi_object_type acpi_type;
- int type;
- if (device)
- goto out;
- if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
- return AE_OK;
- switch (acpi_type) {
- case ACPI_TYPE_DEVICE:
- if (acpi_device_should_be_hidden(handle))
- return AE_OK;
- /* Bail out if there are dependencies. */
- if (acpi_scan_check_dep(handle, check_dep) > 0) {
- acpi_bus_scan_second_pass = true;
- return AE_CTRL_DEPTH;
- }
- fallthrough;
- case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
- type = ACPI_BUS_TYPE_DEVICE;
- break;
- case ACPI_TYPE_PROCESSOR:
- type = ACPI_BUS_TYPE_PROCESSOR;
- break;
- case ACPI_TYPE_THERMAL:
- type = ACPI_BUS_TYPE_THERMAL;
- break;
- case ACPI_TYPE_POWER:
- acpi_add_power_resource(handle);
- fallthrough;
- default:
- return AE_OK;
- }
- /*
- * If check_dep is true at this point, the device has no dependencies,
- * or the creation of the device object would have been postponed above.
- */
- acpi_add_single_object(&device, handle, type, !check_dep);
- if (!device)
- return AE_CTRL_DEPTH;
- acpi_scan_init_hotplug(device);
- out:
- if (!*adev_p)
- *adev_p = device;
- return AE_OK;
- }
- static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
- void *not_used, void **ret_p)
- {
- return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
- }
- static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
- void *not_used, void **ret_p)
- {
- return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
- }
- static void acpi_default_enumeration(struct acpi_device *device)
- {
- /*
- * Do not enumerate devices with enumeration_by_parent flag set as
- * they will be enumerated by their respective parents.
- */
- if (!device->flags.enumeration_by_parent) {
- acpi_create_platform_device(device, NULL);
- acpi_device_set_enumerated(device);
- } else {
- blocking_notifier_call_chain(&acpi_reconfig_chain,
- ACPI_RECONFIG_DEVICE_ADD, device);
- }
- }
- static const struct acpi_device_id generic_device_ids[] = {
- {ACPI_DT_NAMESPACE_HID, },
- {"", },
- };
- static int acpi_generic_device_attach(struct acpi_device *adev,
- const struct acpi_device_id *not_used)
- {
- /*
- * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
- * below can be unconditional.
- */
- if (adev->data.of_compatible)
- acpi_default_enumeration(adev);
- return 1;
- }
- static struct acpi_scan_handler generic_device_handler = {
- .ids = generic_device_ids,
- .attach = acpi_generic_device_attach,
- };
- static int acpi_scan_attach_handler(struct acpi_device *device)
- {
- struct acpi_hardware_id *hwid;
- int ret = 0;
- list_for_each_entry(hwid, &device->pnp.ids, list) {
- const struct acpi_device_id *devid;
- struct acpi_scan_handler *handler;
- handler = acpi_scan_match_handler(hwid->id, &devid);
- if (handler) {
- if (!handler->attach) {
- device->pnp.type.platform_id = 0;
- continue;
- }
- device->handler = handler;
- ret = handler->attach(device, devid);
- if (ret > 0)
- break;
- device->handler = NULL;
- if (ret < 0)
- break;
- }
- }
- return ret;
- }
- static int acpi_bus_attach(struct acpi_device *device, void *first_pass)
- {
- bool skip = !first_pass && device->flags.visited;
- acpi_handle ejd;
- int ret;
- if (skip)
- goto ok;
- if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
- register_dock_dependent_device(device, ejd);
- acpi_bus_get_status(device);
- /* Skip devices that are not ready for enumeration (e.g. not present) */
- if (!acpi_dev_ready_for_enumeration(device)) {
- device->flags.initialized = false;
- acpi_device_clear_enumerated(device);
- device->flags.power_manageable = 0;
- return 0;
- }
- if (device->handler)
- goto ok;
- if (!device->flags.initialized) {
- device->flags.power_manageable =
- device->power.states[ACPI_STATE_D0].flags.valid;
- if (acpi_bus_init_power(device))
- device->flags.power_manageable = 0;
- device->flags.initialized = true;
- } else if (device->flags.visited) {
- goto ok;
- }
- ret = acpi_scan_attach_handler(device);
- if (ret < 0)
- return 0;
- device->flags.match_driver = true;
- if (ret > 0 && !device->flags.enumeration_by_parent) {
- acpi_device_set_enumerated(device);
- goto ok;
- }
- ret = device_attach(&device->dev);
- if (ret < 0)
- return 0;
- if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
- acpi_default_enumeration(device);
- else
- acpi_device_set_enumerated(device);
- ok:
- acpi_dev_for_each_child(device, acpi_bus_attach, first_pass);
- if (!skip && device->handler && device->handler->hotplug.notify_online)
- device->handler->hotplug.notify_online(device);
- return 0;
- }
- static int acpi_dev_get_next_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
- {
- struct acpi_device **adev_p = data;
- struct acpi_device *adev = *adev_p;
- /*
- * If we're passed a 'previous' consumer device then we need to skip
- * any consumers until we meet the previous one, and then NULL @data
- * so the next one can be returned.
- */
- if (adev) {
- if (dep->consumer == adev->handle)
- *adev_p = NULL;
- return 0;
- }
- adev = acpi_get_acpi_dev(dep->consumer);
- if (adev) {
- *(struct acpi_device **)data = adev;
- return 1;
- }
- /* Continue parsing if the device object is not present. */
- return 0;
- }
- struct acpi_scan_clear_dep_work {
- struct work_struct work;
- struct acpi_device *adev;
- };
- static void acpi_scan_clear_dep_fn(struct work_struct *work)
- {
- struct acpi_scan_clear_dep_work *cdw;
- cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
- acpi_scan_lock_acquire();
- acpi_bus_attach(cdw->adev, (void *)true);
- acpi_scan_lock_release();
- acpi_dev_put(cdw->adev);
- kfree(cdw);
- }
- static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
- {
- struct acpi_scan_clear_dep_work *cdw;
- if (adev->dep_unmet)
- return false;
- cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
- if (!cdw)
- return false;
- cdw->adev = adev;
- INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
- /*
- * Since the work function may block on the lock until the entire
- * initial enumeration of devices is complete, put it into the unbound
- * workqueue.
- */
- queue_work(system_unbound_wq, &cdw->work);
- return true;
- }
- static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
- {
- struct acpi_device *adev = acpi_get_acpi_dev(dep->consumer);
- if (adev) {
- adev->dep_unmet--;
- if (!acpi_scan_clear_dep_queue(adev))
- acpi_dev_put(adev);
- }
- list_del(&dep->node);
- kfree(dep);
- return 0;
- }
- /**
- * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list
- * @handle: The ACPI handle of the supplier device
- * @callback: Pointer to the callback function to apply
- * @data: Pointer to some data to pass to the callback
- *
- * The return value of the callback determines this function's behaviour. If 0
- * is returned we continue to iterate over acpi_dep_list. If a positive value
- * is returned then the loop is broken but this function returns 0. If a
- * negative value is returned by the callback then the loop is broken and that
- * value is returned as the final error.
- */
- static int acpi_walk_dep_device_list(acpi_handle handle,
- int (*callback)(struct acpi_dep_data *, void *),
- void *data)
- {
- struct acpi_dep_data *dep, *tmp;
- int ret = 0;
- mutex_lock(&acpi_dep_list_lock);
- list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
- if (dep->supplier == handle) {
- ret = callback(dep, data);
- if (ret)
- break;
- }
- }
- mutex_unlock(&acpi_dep_list_lock);
- return ret > 0 ? 0 : ret;
- }
- /**
- * acpi_dev_clear_dependencies - Inform consumers that the device is now active
- * @supplier: Pointer to the supplier &struct acpi_device
- *
- * Clear dependencies on the given device.
- */
- void acpi_dev_clear_dependencies(struct acpi_device *supplier)
- {
- acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
- }
- EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
- /**
- * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration
- * @device: Pointer to the &struct acpi_device to check
- *
- * Check if the device is present and has no unmet dependencies.
- *
- * Return true if the device is ready for enumeratino. Otherwise, return false.
- */
- bool acpi_dev_ready_for_enumeration(const struct acpi_device *device)
- {
- if (device->flags.honor_deps && device->dep_unmet)
- return false;
- return acpi_device_is_present(device);
- }
- EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);
- /**
- * acpi_dev_get_next_consumer_dev - Return the next adev dependent on @supplier
- * @supplier: Pointer to the dependee device
- * @start: Pointer to the current dependent device
- *
- * Returns the next &struct acpi_device which declares itself dependent on
- * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
- *
- * If the returned adev is not passed as @start to this function, the caller is
- * responsible for putting the reference to adev when it is no longer needed.
- */
- struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier,
- struct acpi_device *start)
- {
- struct acpi_device *adev = start;
- acpi_walk_dep_device_list(supplier->handle,
- acpi_dev_get_next_consumer_dev_cb, &adev);
- acpi_dev_put(start);
- if (adev == start)
- return NULL;
- return adev;
- }
- EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev);
- /**
- * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
- * @handle: Root of the namespace scope to scan.
- *
- * Scan a given ACPI tree (probably recently hot-plugged) and create and add
- * found devices.
- *
- * If no devices were found, -ENODEV is returned, but it does not mean that
- * there has been a real error. There just have been no suitable ACPI objects
- * in the table trunk from which the kernel could create a device and add an
- * appropriate driver.
- *
- * Must be called under acpi_scan_lock.
- */
- int acpi_bus_scan(acpi_handle handle)
- {
- struct acpi_device *device = NULL;
- acpi_bus_scan_second_pass = false;
- /* Pass 1: Avoid enumerating devices with missing dependencies. */
- if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
- acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
- acpi_bus_check_add_1, NULL, NULL,
- (void **)&device);
- if (!device)
- return -ENODEV;
- acpi_bus_attach(device, (void *)true);
- if (!acpi_bus_scan_second_pass)
- return 0;
- /* Pass 2: Enumerate all of the remaining devices. */
- device = NULL;
- if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device)))
- acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
- acpi_bus_check_add_2, NULL, NULL,
- (void **)&device);
- acpi_bus_attach(device, NULL);
- return 0;
- }
- EXPORT_SYMBOL(acpi_bus_scan);
- static int acpi_bus_trim_one(struct acpi_device *adev, void *not_used)
- {
- struct acpi_scan_handler *handler = adev->handler;
- acpi_dev_for_each_child_reverse(adev, acpi_bus_trim_one, NULL);
- adev->flags.match_driver = false;
- if (handler) {
- if (handler->detach)
- handler->detach(adev);
- adev->handler = NULL;
- } else {
- device_release_driver(&adev->dev);
- }
- /*
- * Most likely, the device is going away, so put it into D3cold before
- * that.
- */
- acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
- adev->flags.initialized = false;
- acpi_device_clear_enumerated(adev);
- return 0;
- }
- /**
- * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
- * @adev: Root of the ACPI namespace scope to walk.
- *
- * Must be called under acpi_scan_lock.
- */
- void acpi_bus_trim(struct acpi_device *adev)
- {
- acpi_bus_trim_one(adev, NULL);
- }
- EXPORT_SYMBOL_GPL(acpi_bus_trim);
- int acpi_bus_register_early_device(int type)
- {
- struct acpi_device *device = NULL;
- int result;
- result = acpi_add_single_object(&device, NULL, type, false);
- if (result)
- return result;
- device->flags.match_driver = true;
- return device_attach(&device->dev);
- }
- EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
- static void acpi_bus_scan_fixed(void)
- {
- if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
- struct acpi_device *adev = NULL;
- acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON,
- false);
- if (adev) {
- adev->flags.match_driver = true;
- if (device_attach(&adev->dev) >= 0)
- device_init_wakeup(&adev->dev, true);
- else
- dev_dbg(&adev->dev, "No driver\n");
- }
- }
- if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
- struct acpi_device *adev = NULL;
- acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON,
- false);
- if (adev) {
- adev->flags.match_driver = true;
- if (device_attach(&adev->dev) < 0)
- dev_dbg(&adev->dev, "No driver\n");
- }
- }
- }
- static void __init acpi_get_spcr_uart_addr(void)
- {
- acpi_status status;
- struct acpi_table_spcr *spcr_ptr;
- status = acpi_get_table(ACPI_SIG_SPCR, 0,
- (struct acpi_table_header **)&spcr_ptr);
- if (ACPI_FAILURE(status)) {
- pr_warn("STAO table present, but SPCR is missing\n");
- return;
- }
- spcr_uart_addr = spcr_ptr->serial_port.address;
- acpi_put_table((struct acpi_table_header *)spcr_ptr);
- }
- static bool acpi_scan_initialized;
- void __init acpi_scan_init(void)
- {
- acpi_status status;
- struct acpi_table_stao *stao_ptr;
- acpi_pci_root_init();
- acpi_pci_link_init();
- acpi_processor_init();
- acpi_platform_init();
- acpi_lpss_init();
- acpi_apd_init();
- acpi_cmos_rtc_init();
- acpi_container_init();
- acpi_memory_hotplug_init();
- acpi_watchdog_init();
- acpi_pnp_init();
- acpi_int340x_thermal_init();
- acpi_amba_init();
- acpi_init_lpit();
- acpi_scan_add_handler(&generic_device_handler);
- /*
- * If there is STAO table, check whether it needs to ignore the UART
- * device in SPCR table.
- */
- status = acpi_get_table(ACPI_SIG_STAO, 0,
- (struct acpi_table_header **)&stao_ptr);
- if (ACPI_SUCCESS(status)) {
- if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
- pr_info("STAO Name List not yet supported.\n");
- if (stao_ptr->ignore_uart)
- acpi_get_spcr_uart_addr();
- acpi_put_table((struct acpi_table_header *)stao_ptr);
- }
- acpi_gpe_apply_masked_gpes();
- acpi_update_all_gpes();
- /*
- * Although we call __add_memory() that is documented to require the
- * device_hotplug_lock, it is not necessary here because this is an
- * early code when userspace or any other code path cannot trigger
- * hotplug/hotunplug operations.
- */
- mutex_lock(&acpi_scan_lock);
- /*
- * Enumerate devices in the ACPI namespace.
- */
- if (acpi_bus_scan(ACPI_ROOT_OBJECT))
- goto unlock;
- acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);
- if (!acpi_root)
- goto unlock;
- /* Fixed feature devices do not exist on HW-reduced platform */
- if (!acpi_gbl_reduced_hardware)
- acpi_bus_scan_fixed();
- acpi_turn_off_unused_power_resources();
- acpi_scan_initialized = true;
- unlock:
- mutex_unlock(&acpi_scan_lock);
- }
- static struct acpi_probe_entry *ape;
- static int acpi_probe_count;
- static DEFINE_MUTEX(acpi_probe_mutex);
- static int __init acpi_match_madt(union acpi_subtable_headers *header,
- const unsigned long end)
- {
- if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
- if (!ape->probe_subtbl(header, end))
- acpi_probe_count++;
- return 0;
- }
- int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
- {
- int count = 0;
- if (acpi_disabled)
- return 0;
- mutex_lock(&acpi_probe_mutex);
- for (ape = ap_head; nr; ape++, nr--) {
- if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
- acpi_probe_count = 0;
- acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
- count += acpi_probe_count;
- } else {
- int res;
- res = acpi_table_parse(ape->id, ape->probe_table);
- if (!res)
- count++;
- }
- }
- mutex_unlock(&acpi_probe_mutex);
- return count;
- }
- static void acpi_table_events_fn(struct work_struct *work)
- {
- acpi_scan_lock_acquire();
- acpi_bus_scan(ACPI_ROOT_OBJECT);
- acpi_scan_lock_release();
- kfree(work);
- }
- void acpi_scan_table_notify(void)
- {
- struct work_struct *work;
- if (!acpi_scan_initialized)
- return;
- work = kmalloc(sizeof(*work), GFP_KERNEL);
- if (!work)
- return;
- INIT_WORK(work, acpi_table_events_fn);
- schedule_work(work);
- }
- int acpi_reconfig_notifier_register(struct notifier_block *nb)
- {
- return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
- }
- EXPORT_SYMBOL(acpi_reconfig_notifier_register);
- int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
- {
- return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
- }
- EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);
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