diff options
Diffstat (limited to 'drivers/acpi/scan.c')
| -rw-r--r-- | drivers/acpi/scan.c | 2752 |
1 files changed, 2752 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c new file mode 100644 index 0000000000..1d249d0f61 --- /dev/null +++ b/drivers/acpi/scan.c @@ -0,0 +1,2752 @@ +// 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" +#include "sleep.h" + +#define ACPI_BUS_CLASS "system_bus" +#define ACPI_BUS_HID "LNXSYBUS" +#define ACPI_BUS_DEVICE_NAME "System Bus" + +#define INVALID_ACPI_HANDLE ((acpi_handle)ZERO_PAGE(0)) + +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 */ + "INTC1059", /* IVSC (TGL) driver must be loaded to allow i2c access to camera sensors */ + "INTC1095", /* IVSC (ADL) driver must be loaded to allow i2c access to camera sensors */ + "INTC100A", /* IVSC (RPL) driver must be loaded to allow i2c access to camera sensors */ + 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; +} + +/* Do not use a button for S5 wakeup */ +#define ACPI_AVOID_WAKE_FROM_S5 BIT(0) + +static bool acpi_wakeup_gpe_init(struct acpi_device *device) +{ + static const struct acpi_device_id button_device_ids[] = { + {"PNP0C0C", 0}, /* Power button */ + {"PNP0C0D", ACPI_AVOID_WAKE_FROM_S5}, /* Lid */ + {"PNP0C0E", ACPI_AVOID_WAKE_FROM_S5}, /* Sleep button */ + {"", 0}, + }; + struct acpi_device_wakeup *wakeup = &device->wakeup; + const struct acpi_device_id *match; + acpi_status status; + + wakeup->flags.notifier_present = 0; + + /* Power button, Lid switch always enable wakeup */ + match = acpi_match_acpi_device(button_device_ids, device); + if (match) { + if ((match->driver_data & ACPI_AVOID_WAKE_FROM_S5) && + 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) + 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 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) + 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 void acpi_scan_delete_dep_data(struct acpi_dep_data *dep) +{ + list_del(&dep->node); + kfree(dep); +} + +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); + } + + if (dep->free_when_met) + acpi_scan_delete_dep_data(dep); + else + dep->met = true; + + 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); + +static void acpi_scan_postponed_branch(acpi_handle handle) +{ + struct acpi_device *adev = NULL; + + if (ACPI_FAILURE(acpi_bus_check_add(handle, false, &adev))) + return; + + acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, + acpi_bus_check_add_2, NULL, NULL, (void **)&adev); + acpi_bus_attach(adev, NULL); +} + +static void acpi_scan_postponed(void) +{ + struct acpi_dep_data *dep, *tmp; + + mutex_lock(&acpi_dep_list_lock); + + list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { + acpi_handle handle = dep->consumer; + + /* + * In case there are multiple acpi_dep_list entries with the + * same consumer, skip the current entry if the consumer device + * object corresponding to it is present already. + */ + if (!acpi_fetch_acpi_dev(handle)) { + /* + * Even though the lock is released here, tmp is + * guaranteed to be valid, because none of the list + * entries following dep is marked as "free when met" + * and so they cannot be deleted. + */ + mutex_unlock(&acpi_dep_list_lock); + + acpi_scan_postponed_branch(handle); + + mutex_lock(&acpi_dep_list_lock); + } + + if (dep->met) + acpi_scan_delete_dep_data(dep); + else + dep->free_when_met = true; + } + + mutex_unlock(&acpi_dep_list_lock); +} + +/** + * 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; + + /* 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); + + /* Pass 2: Enumerate all of the remaining devices. */ + + acpi_scan_postponed(); + + 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_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); |