v4.19.13 snapshot.
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
new file mode 100644
index 0000000..e1b6231
--- /dev/null
+++ b/drivers/acpi/scan.c
@@ -0,0 +1,2333 @@
+/*
+ * scan.c - support for transforming the ACPI namespace into individual objects
+ */
+
+#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/signal.h>
+#include <linux/kthread.h>
+#include <linux/dmi.h>
+#include <linux/nls.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_data/x86/apple.h>
+
+#include <asm/pgtable.h>
+
+#include "internal.h"
+
+#define _COMPONENT ACPI_BUS_COMPONENT
+ACPI_MODULE_NAME("scan");
+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 ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
+
+#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;
+
+struct acpi_dep_data {
+ struct list_head node;
+ acpi_handle master;
+ acpi_handle slave;
+};
+
+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 = NULL;
+ struct acpi_device_physical_node *pn;
+ bool second_pass = (bool)data;
+ acpi_status status = AE_OK;
+
+ if (acpi_bus_get_device(handle, &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 = NULL;
+ struct acpi_device_physical_node *pn;
+
+ if (acpi_bus_get_device(handle, &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_DEBUG_PRINT((ACPI_DB_INFO,
+ "Hot-removing device %s...\n", dev_name(&device->dev)));
+
+ 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)
+{
+ struct acpi_scan_handler *handler = adev->handler;
+ struct acpi_device *child;
+ 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;
+ }
+ list_for_each_entry(child, &adev->children, node) {
+ error = acpi_scan_bus_check(child);
+ if (error)
+ return error;
+ }
+ return 0;
+}
+
+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);
+ 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_bus_put_acpi_device(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);
+ if (device->parent)
+ list_del(&device->node);
+
+ 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))) {
+ if (acpi_device_bus_id->instance_no > 0)
+ acpi_device_bus_id->instance_no--;
+ else {
+ list_del(&acpi_device_bus_id->node);
+ 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);
+ put_device(&adev->dev);
+ }
+}
+
+/**
+ * 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 previosuly, 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 int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
+ void (*callback)(void *))
+{
+ acpi_status status;
+
+ if (!device)
+ return -EINVAL;
+
+ status = acpi_get_data_full(handle, acpi_scan_drop_device,
+ (void **)device, callback);
+ if (ACPI_FAILURE(status) || !*device) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
+ handle));
+ return -ENODEV;
+ }
+ return 0;
+}
+
+int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
+{
+ return acpi_get_device_data(handle, device, NULL);
+}
+EXPORT_SYMBOL(acpi_bus_get_device);
+
+static void get_acpi_device(void *dev)
+{
+ if (dev)
+ get_device(&((struct acpi_device *)dev)->dev);
+}
+
+struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
+{
+ struct acpi_device *adev = NULL;
+
+ acpi_get_device_data(handle, &adev, get_acpi_device);
+ return adev;
+}
+
+void acpi_bus_put_acpi_device(struct acpi_device *adev)
+{
+ put_device(&adev->dev);
+}
+
+int acpi_device_add(struct acpi_device *device,
+ void (*release)(struct device *))
+{
+ int result;
+ struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
+ int found = 0;
+
+ if (device->handle) {
+ acpi_status status;
+
+ status = acpi_attach_data(device->handle, acpi_scan_drop_device,
+ device);
+ if (ACPI_FAILURE(status)) {
+ acpi_handle_err(device->handle,
+ "Unable to attach device data\n");
+ return -ENODEV;
+ }
+ }
+
+ /*
+ * Linkage
+ * -------
+ * Link this device to its parent and siblings.
+ */
+ INIT_LIST_HEAD(&device->children);
+ INIT_LIST_HEAD(&device->node);
+ 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);
+
+ new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
+ if (!new_bus_id) {
+ pr_err(PREFIX "Memory allocation error\n");
+ result = -ENOMEM;
+ goto err_detach;
+ }
+
+ mutex_lock(&acpi_device_lock);
+ /*
+ * Find suitable bus_id and instance number in acpi_bus_id_list
+ * If failed, create one and link it into 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,
+ acpi_device_hid(device))) {
+ acpi_device_bus_id->instance_no++;
+ found = 1;
+ kfree(new_bus_id);
+ break;
+ }
+ }
+ if (!found) {
+ acpi_device_bus_id = new_bus_id;
+ strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
+ acpi_device_bus_id->instance_no = 0;
+ list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
+ }
+ dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
+
+ if (device->parent)
+ list_add_tail(&device->node, &device->parent->children);
+
+ if (device->wakeup.flags.valid)
+ list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
+ mutex_unlock(&acpi_device_lock);
+
+ if (device->parent)
+ device->dev.parent = &device->parent->dev;
+ device->dev.bus = &acpi_bus_type;
+ device->dev.release = release;
+ 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)
+ printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
+ dev_name(&device->dev));
+
+ return 0;
+
+ err:
+ mutex_lock(&acpi_device_lock);
+ if (device->parent)
+ list_del(&device->node);
+ list_del(&device->wakeup_list);
+ mutex_unlock(&acpi_device_lock);
+
+ err_detach:
+ acpi_detach_data(device->handle, acpi_scan_drop_device);
+ return result;
+}
+
+/* --------------------------------------------------------------------------
+ Device Enumeration
+ -------------------------------------------------------------------------- */
+static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
+{
+ struct acpi_device *device = NULL;
+ acpi_status status;
+
+ /*
+ * 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 {
+ status = acpi_get_parent(handle, &handle);
+ if (ACPI_FAILURE(status))
+ return status == AE_NULL_ENTRY ? NULL : acpi_root;
+ } while (acpi_bus_get_device(handle, &device));
+ return device;
+}
+
+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(acpi_handle handle,
+ struct acpi_device_wakeup *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;
+
+ if (!wakeup)
+ return -EINVAL;
+
+ INIT_LIST_HEAD(&wakeup->resources);
+
+ /* _PRW */
+ status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
+ 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},
+ {"PNP0C0D", 0},
+ {"PNP0C0E", 0},
+ {"", 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->handle,
+ &device->wakeup);
+ if (err) {
+ dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
+ 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 depreciated 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)
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "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) {
+ int err = acpi_extract_power_resources(package, 0,
+ &ps->resources);
+ if (!err)
+ device->power.flags.power_resources = 1;
+ }
+ 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)
+{
+ 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;
+
+ /*
+ * 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);
+ if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
+ device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
+
+ /* Set defaults for D0 and D3hot states (always valid) */
+ 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;
+
+ 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_IS_ROOT_DEVICE(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_DEBUG_PRINT((ACPI_DB_INFO, "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)
+{
+ acpi_status status;
+ struct acpi_device_info *info;
+ 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;
+ }
+
+ status = acpi_get_object_info(handle, &info);
+ if (ACPI_FAILURE(status)) {
+ pr_err(PREFIX "%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);
+ else 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(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
+ * @dma_addr: pointer device DMA address result
+ * @offset: pointer to the DMA offset result
+ * @size: pointer to DMA range size result
+ *
+ * Evaluate DMA regions and return respectively DMA region start, offset
+ * and size in dma_addr, offset and size 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, u64 *dma_addr, u64 *offset,
+ u64 *size)
+{
+ struct acpi_device *adev;
+ LIST_HEAD(list);
+ struct resource_entry *rentry;
+ int ret;
+ struct device *dma_dev = dev;
+ u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
+
+ /*
+ * 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) {
+ list_for_each_entry(rentry, &list, node) {
+ if (dma_offset && rentry->offset != dma_offset) {
+ ret = -EINVAL;
+ dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
+ goto out;
+ }
+ dma_offset = rentry->offset;
+
+ /* Take lower and upper limits */
+ if (rentry->res->start < dma_start)
+ dma_start = rentry->res->start;
+ if (rentry->res->end > dma_end)
+ dma_end = rentry->res->end;
+ }
+
+ if (dma_start >= dma_end) {
+ ret = -EINVAL;
+ dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
+ goto out;
+ }
+
+ *dma_addr = dma_start - dma_offset;
+ len = dma_end - dma_start;
+ *size = max(len, len + 1);
+ *offset = dma_offset;
+ }
+ out:
+ acpi_dev_free_resource_list(&list);
+
+ return ret >= 0 ? 0 : ret;
+}
+
+/**
+ * acpi_dma_configure - Set-up DMA configuration for the device.
+ * @dev: The pointer to the device
+ * @attr: device dma attributes
+ */
+int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
+{
+ const struct iommu_ops *iommu;
+ u64 dma_addr = 0, size = 0;
+
+ iort_dma_setup(dev, &dma_addr, &size);
+
+ iommu = iort_iommu_configure(dev);
+ if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ arch_setup_dma_ops(dev, dma_addr, size,
+ iommu, attr == DEV_DMA_COHERENT);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_dma_configure);
+
+/**
+ * acpi_dma_deconfigure - Tear-down DMA configuration for the device.
+ * @dev: The pointer to the device
+ */
+void acpi_dma_deconfigure(struct device *dev)
+{
+ arch_teardown_dma_ops(dev);
+}
+EXPORT_SYMBOL_GPL(acpi_dma_deconfigure);
+
+static void acpi_init_coherency(struct acpi_device *adev)
+{
+ unsigned long long cca = 0;
+ acpi_status status;
+ struct acpi_device *parent = adev->parent;
+
+ 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 = device->parent;
+ 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;
+ /*
+ * These devices have multiple I2cSerialBus resources and an i2c-client
+ * must be instantiated for each, each with its own i2c_device_id.
+ * Normally we only instantiate an i2c-client for the first resource,
+ * using the ACPI HID as id. These special cases are handled by the
+ * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
+ * which i2c_device_id to use for each resource.
+ */
+ static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
+ {"BSG1160", },
+ {}
+ };
+
+ 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;
+
+ /* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
+ if (!acpi_match_device_ids(device, i2c_multi_instantiate_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, unsigned long long sta)
+{
+ INIT_LIST_HEAD(&device->pnp.ids);
+ device->device_type = type;
+ device->handle = handle;
+ device->parent = acpi_bus_get_parent(handle);
+ device->fwnode.ops = &acpi_device_fwnode_ops;
+ acpi_set_device_status(device, sta);
+ 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);
+ /* Assume there are unmet deps until acpi_device_dep_initialize() runs */
+ device->dep_unmet = 1;
+}
+
+void acpi_device_add_finalize(struct acpi_device *device)
+{
+ dev_set_uevent_suppress(&device->dev, false);
+ kobject_uevent(&device->dev.kobj, KOBJ_ADD);
+}
+
+static int acpi_add_single_object(struct acpi_device **child,
+ acpi_handle handle, int type,
+ unsigned long long sta)
+{
+ int result;
+ struct acpi_device *device;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+
+ device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
+ if (!device) {
+ printk(KERN_ERR PREFIX "Memory allocation error\n");
+ return -ENOMEM;
+ }
+
+ acpi_init_device_object(device, handle, type, sta);
+ /*
+ * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
+ * that we can call acpi_bus_get_status() and use its quirk handling.
+ * Note this must be done before the get power-/wakeup_dev-flags calls.
+ */
+ if (type == ACPI_BUS_TYPE_DEVICE)
+ if (acpi_bus_get_status(device) < 0)
+ acpi_set_device_status(device, 0);
+
+ acpi_bus_get_power_flags(device);
+ acpi_bus_get_wakeup_device_flags(device);
+
+ result = acpi_device_add(device, acpi_device_release);
+ if (result) {
+ acpi_device_release(&device->dev);
+ return result;
+ }
+
+ acpi_power_add_remove_device(device, true);
+ acpi_device_add_finalize(device);
+ acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
+ dev_name(&device->dev), (char *) buffer.pointer,
+ device->parent ? dev_name(&device->parent->dev) : "(null)"));
+ kfree(buffer.pointer);
+ *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;
+}
+
+static int acpi_bus_type_and_status(acpi_handle handle, int *type,
+ unsigned long long *sta)
+{
+ acpi_status status;
+ acpi_object_type acpi_type;
+
+ status = acpi_get_type(handle, &acpi_type);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+
+ switch (acpi_type) {
+ case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
+ case ACPI_TYPE_DEVICE:
+ if (acpi_device_should_be_hidden(handle))
+ return -ENODEV;
+
+ *type = ACPI_BUS_TYPE_DEVICE;
+ /*
+ * acpi_add_single_object updates this once we've an acpi_device
+ * so that acpi_bus_get_status' quirk handling can be used.
+ */
+ *sta = ACPI_STA_DEFAULT;
+ break;
+ case ACPI_TYPE_PROCESSOR:
+ *type = ACPI_BUS_TYPE_PROCESSOR;
+ status = acpi_bus_get_status_handle(handle, sta);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+ break;
+ case ACPI_TYPE_THERMAL:
+ *type = ACPI_BUS_TYPE_THERMAL;
+ *sta = ACPI_STA_DEFAULT;
+ break;
+ case ACPI_TYPE_POWER:
+ *type = ACPI_BUS_TYPE_POWER;
+ *sta = ACPI_STA_DEFAULT;
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+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 void acpi_device_dep_initialize(struct acpi_device *adev)
+{
+ struct acpi_dep_data *dep;
+ struct acpi_handle_list dep_devices;
+ acpi_status status;
+ int i;
+
+ adev->dep_unmet = 0;
+
+ if (!acpi_has_method(adev->handle, "_DEP"))
+ return;
+
+ status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
+ &dep_devices);
+ if (ACPI_FAILURE(status)) {
+ dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
+ return;
+ }
+
+ for (i = 0; i < dep_devices.count; i++) {
+ struct acpi_device_info *info;
+ int skip;
+
+ status = acpi_get_object_info(dep_devices.handles[i], &info);
+ if (ACPI_FAILURE(status)) {
+ dev_dbg(&adev->dev, "Error reading _DEP device info\n");
+ continue;
+ }
+
+ /*
+ * Skip the dependency of Windows System Power
+ * Management Controller
+ */
+ skip = info->valid & ACPI_VALID_HID &&
+ !strcmp(info->hardware_id.string, "INT3396");
+
+ kfree(info);
+
+ if (skip)
+ continue;
+
+ dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
+ if (!dep)
+ return;
+
+ dep->master = dep_devices.handles[i];
+ dep->slave = adev->handle;
+ adev->dep_unmet++;
+
+ mutex_lock(&acpi_dep_list_lock);
+ list_add_tail(&dep->node , &acpi_dep_list);
+ mutex_unlock(&acpi_dep_list_lock);
+ }
+}
+
+static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
+ void *not_used, void **return_value)
+{
+ struct acpi_device *device = NULL;
+ int type;
+ unsigned long long sta;
+ int result;
+
+ acpi_bus_get_device(handle, &device);
+ if (device)
+ goto out;
+
+ result = acpi_bus_type_and_status(handle, &type, &sta);
+ if (result)
+ return AE_OK;
+
+ if (type == ACPI_BUS_TYPE_POWER) {
+ acpi_add_power_resource(handle);
+ return AE_OK;
+ }
+
+ acpi_add_single_object(&device, handle, type, sta);
+ if (!device)
+ return AE_CTRL_DEPTH;
+
+ acpi_scan_init_hotplug(device);
+ acpi_device_dep_initialize(device);
+
+ out:
+ if (!*return_value)
+ *return_value = device;
+
+ return AE_OK;
+}
+
+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 void acpi_bus_attach(struct acpi_device *device)
+{
+ struct acpi_device *child;
+ acpi_handle ejd;
+ int ret;
+
+ 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 present. */
+ if (!acpi_device_is_present(device)) {
+ device->flags.initialized = false;
+ acpi_device_clear_enumerated(device);
+ device->flags.power_manageable = 0;
+ return;
+ }
+ 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;
+
+ 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;
+
+ if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
+ acpi_default_enumeration(device);
+ else
+ acpi_device_set_enumerated(device);
+
+ ok:
+ list_for_each_entry(child, &device->children, node)
+ acpi_bus_attach(child);
+
+ if (device->handler && device->handler->hotplug.notify_online)
+ device->handler->hotplug.notify_online(device);
+}
+
+void acpi_walk_dep_device_list(acpi_handle handle)
+{
+ struct acpi_dep_data *dep, *tmp;
+ struct acpi_device *adev;
+
+ mutex_lock(&acpi_dep_list_lock);
+ list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
+ if (dep->master == handle) {
+ acpi_bus_get_device(dep->slave, &adev);
+ if (!adev)
+ continue;
+
+ adev->dep_unmet--;
+ if (!adev->dep_unmet)
+ acpi_bus_attach(adev);
+ list_del(&dep->node);
+ kfree(dep);
+ }
+ }
+ mutex_unlock(&acpi_dep_list_lock);
+}
+EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
+
+/**
+ * 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)
+{
+ void *device = NULL;
+
+ if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
+ acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
+ acpi_bus_check_add, NULL, NULL, &device);
+
+ if (device) {
+ acpi_bus_attach(device);
+ return 0;
+ }
+ return -ENODEV;
+}
+EXPORT_SYMBOL(acpi_bus_scan);
+
+/**
+ * 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)
+{
+ struct acpi_scan_handler *handler = adev->handler;
+ struct acpi_device *child;
+
+ list_for_each_entry_reverse(child, &adev->children, node)
+ acpi_bus_trim(child);
+
+ 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);
+}
+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, ACPI_STA_DEFAULT);
+ if (result)
+ return result;
+
+ device->flags.match_driver = true;
+ return device_attach(&device->dev);
+}
+EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
+
+static int acpi_bus_scan_fixed(void)
+{
+ int result = 0;
+
+ /*
+ * Enumerate all fixed-feature devices.
+ */
+ if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
+ struct acpi_device *device = NULL;
+
+ result = acpi_add_single_object(&device, NULL,
+ ACPI_BUS_TYPE_POWER_BUTTON,
+ ACPI_STA_DEFAULT);
+ if (result)
+ return result;
+
+ device->flags.match_driver = true;
+ result = device_attach(&device->dev);
+ if (result < 0)
+ return result;
+
+ device_init_wakeup(&device->dev, true);
+ }
+
+ if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
+ struct acpi_device *device = NULL;
+
+ result = acpi_add_single_object(&device, NULL,
+ ACPI_BUS_TYPE_SLEEP_BUTTON,
+ ACPI_STA_DEFAULT);
+ if (result)
+ return result;
+
+ device->flags.match_driver = true;
+ result = device_attach(&device->dev);
+ }
+
+ return result < 0 ? result : 0;
+}
+
+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_SUCCESS(status))
+ spcr_uart_addr = spcr_ptr->serial_port.address;
+ else
+ printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
+}
+
+static bool acpi_scan_initialized;
+
+int __init acpi_scan_init(void)
+{
+ int result;
+ acpi_status status;
+ struct acpi_table_stao *stao_ptr;
+
+ acpi_pci_root_init();
+ acpi_pci_link_init();
+ acpi_processor_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))
+ printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
+
+ if (stao_ptr->ignore_uart)
+ acpi_get_spcr_uart_addr();
+ }
+
+ acpi_gpe_apply_masked_gpes();
+ acpi_update_all_gpes();
+
+ mutex_lock(&acpi_scan_lock);
+ /*
+ * Enumerate devices in the ACPI namespace.
+ */
+ result = acpi_bus_scan(ACPI_ROOT_OBJECT);
+ if (result)
+ goto out;
+
+ result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
+ if (result)
+ goto out;
+
+ /* Fixed feature devices do not exist on HW-reduced platform */
+ if (!acpi_gbl_reduced_hardware) {
+ result = acpi_bus_scan_fixed();
+ if (result) {
+ acpi_detach_data(acpi_root->handle,
+ acpi_scan_drop_device);
+ acpi_device_del(acpi_root);
+ put_device(&acpi_root->dev);
+ goto out;
+ }
+ }
+
+ acpi_scan_initialized = true;
+
+ out:
+ mutex_unlock(&acpi_scan_lock);
+ return result;
+}
+
+static struct acpi_probe_entry *ape;
+static int acpi_probe_count;
+static DEFINE_MUTEX(acpi_probe_mutex);
+
+static int __init acpi_match_madt(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ if (!ape->subtable_valid || ape->subtable_valid(header, 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_NAME(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;
+}
+
+struct acpi_table_events_work {
+ struct work_struct work;
+ void *table;
+ u32 event;
+};
+
+static void acpi_table_events_fn(struct work_struct *work)
+{
+ struct acpi_table_events_work *tew;
+
+ tew = container_of(work, struct acpi_table_events_work, work);
+
+ if (tew->event == ACPI_TABLE_EVENT_LOAD) {
+ acpi_scan_lock_acquire();
+ acpi_bus_scan(ACPI_ROOT_OBJECT);
+ acpi_scan_lock_release();
+ }
+
+ kfree(tew);
+}
+
+void acpi_scan_table_handler(u32 event, void *table, void *context)
+{
+ struct acpi_table_events_work *tew;
+
+ if (!acpi_scan_initialized)
+ return;
+
+ if (event != ACPI_TABLE_EVENT_LOAD)
+ return;
+
+ tew = kmalloc(sizeof(*tew), GFP_KERNEL);
+ if (!tew)
+ return;
+
+ INIT_WORK(&tew->work, acpi_table_events_fn);
+ tew->table = table;
+ tew->event = event;
+
+ schedule_work(&tew->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);