diff --git a/include/linux/irqdomain_defs.h b/include/linux/irqdomain_defs.h
index 0b2d8a83e0d837c7ce5e3fab22904bafa97fee08..c29921fd8cd15a892adeb33752601d81747fda9c 100644
--- a/include/linux/irqdomain_defs.h
+++ b/include/linux/irqdomain_defs.h
@@ -25,6 +25,7 @@ enum irq_domain_bus_token {
 	DOMAIN_BUS_PCI_DEVICE_MSIX,
 	DOMAIN_BUS_DMAR,
 	DOMAIN_BUS_AMDVI,
+	DOMAIN_BUS_PCI_DEVICE_IMS,
 };
 
 #endif /* _LINUX_IRQDOMAIN_DEFS_H */
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 3cb15866ffbf7bbaa122b7a70a03ab70a034c318..a112b913fff949573a7c67bc686462ae84e21dcf 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -559,6 +559,8 @@ enum {
 	MSI_FLAG_MSIX_CONTIGUOUS	= (1 << 19),
 	/* PCI/MSI-X vectors can be dynamically allocated/freed post MSI-X enable */
 	MSI_FLAG_PCI_MSIX_ALLOC_DYN	= (1 << 20),
+	/* Support for PCI/IMS */
+	MSI_FLAG_PCI_IMS		= (1 << 21),
 };
 
 /**
diff --git a/include/linux/msi_api.h b/include/linux/msi_api.h
index 5ae72d1912c46dd186281b6d6ddb514337311434..391087ad99b170a4cdbcb5178303dd8cbca22565 100644
--- a/include/linux/msi_api.h
+++ b/include/linux/msi_api.h
@@ -15,6 +15,7 @@ struct device;
  */
 enum msi_domain_ids {
 	MSI_DEFAULT_DOMAIN,
+	MSI_SECONDARY_DOMAIN,
 	MSI_MAX_DEVICE_IRQDOMAINS,
 };