diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8a0321a..1817819 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1294,6 +1294,15 @@
 void ht_destroy_irq(unsigned int irq);
 #endif /* CONFIG_HT_IRQ */
 
+#ifdef CONFIG_PCI_ATS
+/* Address Translation Service */
+void pci_ats_init(struct pci_dev *dev);
+void pci_ats_free(struct pci_dev *dev);
+#else
+static inline void pci_ats_init(struct pci_dev *dev) { }
+static inline void pci_ats_free(struct pci_dev *dev) { }
+#endif
+
 void pci_cfg_access_lock(struct pci_dev *dev);
 bool pci_cfg_access_trylock(struct pci_dev *dev);
 void pci_cfg_access_unlock(struct pci_dev *dev);