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-rw-r--r--drivers/acpi/scan.c2707
1 files changed, 2707 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
new file mode 100644
index 000000000..94154a849
--- /dev/null
+++ b/drivers/acpi/scan.c
@@ -0,0 +1,2707 @@
+// 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);