+static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 flags)
+{
+ acpi_status status;
+ u32 support_set, result, capbuf[3];
+
+ /* do _OSC query for all possible controls */
+ support_set = root->osc_support_set | (flags & OSC_PCI_SUPPORT_MASKS);
+ capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
+ capbuf[OSC_SUPPORT_TYPE] = support_set;
+ capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
+
+ status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
+ if (ACPI_SUCCESS(status)) {
+ root->osc_support_set = support_set;
+ root->osc_control_qry = result;
+ root->osc_queried = 1;
+ }
+ return status;
+}
+
+static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
+{
+ acpi_status status;
+ acpi_handle tmp;
+
+ status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
+ if (ACPI_FAILURE(status))
+ return status;
+ mutex_lock(&osc_lock);
+ status = acpi_pci_query_osc(root, flags);
+ mutex_unlock(&osc_lock);
+ return status;
+}
+
+struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
+{
+ struct acpi_pci_root *root;
+
+ list_for_each_entry(root, &acpi_pci_roots, node) {
+ if (root->device->handle == handle)
+ return root;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(acpi_pci_find_root);
+
+struct acpi_handle_node {
+ struct list_head node;
+ acpi_handle handle;
+};
+
+/**
+ * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
+ * @handle: the handle in question
+ *
+ * Given an ACPI CA handle, the desired PCI device is located in the
+ * list of PCI devices.
+ *
+ * If the device is found, its reference count is increased and this
+ * function returns a pointer to its data structure. The caller must
+ * decrement the reference count by calling pci_dev_put().
+ * If no device is found, %NULL is returned.
+ */
+struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
+{
+ int dev, fn;
+ unsigned long long adr;
+ acpi_status status;
+ acpi_handle phandle;
+ struct pci_bus *pbus;
+ struct pci_dev *pdev = NULL;
+ struct acpi_handle_node *node, *tmp;
+ struct acpi_pci_root *root;
+ LIST_HEAD(device_list);