diff --git a/drivers/infiniband/hw/efa/efa.h b/drivers/infiniband/hw/efa/efa.h
index 7352a1f5d811..f17075ed1833 100644
--- a/drivers/infiniband/hw/efa/efa.h
+++ b/drivers/infiniband/hw/efa/efa.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause */
 /*
- * Copyright 2018-2021 Amazon.com, Inc. or its affiliates. All rights reserved.
+ * Copyright 2018-2023 Amazon.com, Inc. or its affiliates. All rights reserved.
  */
 
 #ifndef _EFA_H_
@@ -83,6 +83,9 @@ struct efa_pd {
 struct efa_mr {
 	struct ib_mr ibmr;
 	struct ib_umem *umem;
+	u16 recv_pci_bus_id;
+	u16 rdma_read_pci_bus_id;
+	u16 rdma_recv_pci_bus_id;
 };
 
 struct efa_cq {
diff --git a/drivers/infiniband/hw/efa/efa_admin_cmds_defs.h b/drivers/infiniband/hw/efa/efa_admin_cmds_defs.h
index 9c65bd27bae0..597f7ca6f31d 100644
--- a/drivers/infiniband/hw/efa/efa_admin_cmds_defs.h
+++ b/drivers/infiniband/hw/efa/efa_admin_cmds_defs.h
@@ -415,6 +415,32 @@ struct efa_admin_reg_mr_resp {
 	 * memory region
 	 */
 	u32 r_key;
+
+	/*
+	 * Mask indicating which fields have valid values
+	 * 0 : recv_pci_bus_id
+	 * 1 : rdma_read_pci_bus_id
+	 * 2 : rdma_recv_pci_bus_id
+	 */
+	u8 validity;
+
+	/*
+	 * Physical PCIe bus used by the device to reach the MR for receive
+	 * operation
+	 */
+	u8 recv_pci_bus_id;
+
+	/*
+	 * Physical PCIe bus used by the device to reach the MR for RDMA read
+	 * operation
+	 */
+	u8 rdma_read_pci_bus_id;
+
+	/*
+	 * Physical PCIe bus used by the device to reach the MR for RDMA write
+	 * receive
+	 */
+	u8 rdma_recv_pci_bus_id;
 };
 
 struct efa_admin_dereg_mr_cmd {
@@ -999,6 +1025,11 @@ struct efa_admin_host_info {
 #define EFA_ADMIN_REG_MR_CMD_REMOTE_WRITE_ENABLE_MASK       BIT(1)
 #define EFA_ADMIN_REG_MR_CMD_REMOTE_READ_ENABLE_MASK        BIT(2)
 
+/* reg_mr_resp */
+#define EFA_ADMIN_REG_MR_RESP_RECV_PCI_BUS_ID_MASK          BIT(0)
+#define EFA_ADMIN_REG_MR_RESP_RDMA_READ_PCI_BUS_ID_MASK     BIT(1)
+#define EFA_ADMIN_REG_MR_RESP_RDMA_RECV_PCI_BUS_ID_MASK     BIT(2)
+
 /* create_cq_cmd */
 #define EFA_ADMIN_CREATE_CQ_CMD_INTERRUPT_MODE_ENABLED_MASK BIT(5)
 #define EFA_ADMIN_CREATE_CQ_CMD_VIRT_MASK                   BIT(6)
diff --git a/drivers/infiniband/hw/efa/efa_com_cmd.c b/drivers/infiniband/hw/efa/efa_com_cmd.c
index 576811885d59..6574e0a527f9 100644
--- a/drivers/infiniband/hw/efa/efa_com_cmd.c
+++ b/drivers/infiniband/hw/efa/efa_com_cmd.c
@@ -270,6 +270,12 @@ int efa_com_register_mr(struct efa_com_dev *edev,
 
 	result->l_key = cmd_completion.l_key;
 	result->r_key = cmd_completion.r_key;
+	result->recv_pci_bus_id = EFA_GET(&cmd_completion.validity, EFA_ADMIN_REG_MR_RESP_RECV_PCI_BUS_ID) ?
+		cmd_completion.recv_pci_bus_id : EFA_INVALID_PCI_BUS_ID;
+	result->rdma_read_pci_bus_id = EFA_GET(&cmd_completion.validity, EFA_ADMIN_REG_MR_RESP_RDMA_READ_PCI_BUS_ID) ?
+		cmd_completion.rdma_read_pci_bus_id : EFA_INVALID_PCI_BUS_ID;
+	result->rdma_recv_pci_bus_id = EFA_GET(&cmd_completion.validity, EFA_ADMIN_REG_MR_RESP_RDMA_RECV_PCI_BUS_ID) ?
+		cmd_completion.rdma_recv_pci_bus_id : EFA_INVALID_PCI_BUS_ID;
 
 	return 0;
 }
diff --git a/drivers/infiniband/hw/efa/efa_com_cmd.h b/drivers/infiniband/hw/efa/efa_com_cmd.h
index fc97f37bb39b..a58cd9b63763 100644
--- a/drivers/infiniband/hw/efa/efa_com_cmd.h
+++ b/drivers/infiniband/hw/efa/efa_com_cmd.h
@@ -9,6 +9,7 @@
 #include "efa_com.h"
 
 #define EFA_GID_SIZE 16
+#define EFA_INVALID_PCI_BUS_ID 0xffff
 
 struct efa_com_create_qp_params {
 	u64 rq_base_addr;
@@ -210,6 +211,9 @@ struct efa_com_reg_mr_result {
 	 * accessed memory region
 	 */
 	u32 r_key;
+	u16 recv_pci_bus_id;
+	u16 rdma_read_pci_bus_id;
+	u16 rdma_recv_pci_bus_id;
 };
 
 struct efa_com_dereg_mr_params {
diff --git a/drivers/infiniband/hw/efa/efa_main.c b/drivers/infiniband/hw/efa/efa_main.c
index 15ee92081118..da4f378c7c16 100644
--- a/drivers/infiniband/hw/efa/efa_main.c
+++ b/drivers/infiniband/hw/efa/efa_main.c
@@ -9,6 +9,7 @@
 #include <linux/version.h>
 
 #include <rdma/ib_user_verbs.h>
+#include <rdma/uverbs_ioctl.h>
 
 #include "efa.h"
 
@@ -36,6 +37,8 @@ MODULE_DEVICE_TABLE(pci, efa_pci_tbl);
 	(BIT(EFA_ADMIN_FATAL_ERROR) | BIT(EFA_ADMIN_WARNING) | \
 	 BIT(EFA_ADMIN_NOTIFICATION) | BIT(EFA_ADMIN_KEEP_ALIVE))
 
+extern const struct uapi_definition efa_uapi_defs[];
+
 /* This handler will called for unknown event group or unimplemented handlers */
 static void unimplemented_aenq_handler(void *data,
 				       struct efa_admin_aenq_entry *aenq_e)
@@ -432,6 +435,8 @@ static int efa_ib_device_add(struct efa_dev *dev)
 
 	ib_set_device_ops(&dev->ibdev, &efa_dev_ops);
 
+	dev->ibdev.driver_def = efa_uapi_defs;
+
 	err = ib_register_device(&dev->ibdev, "efa_%d", &pdev->dev);
 	if (err)
 		goto err_destroy_eqs;
diff --git a/drivers/infiniband/hw/efa/efa_verbs.c b/drivers/infiniband/hw/efa/efa_verbs.c
index 0f8ca99d0827..d81904f4b876 100644
--- a/drivers/infiniband/hw/efa/efa_verbs.c
+++ b/drivers/infiniband/hw/efa/efa_verbs.c
@@ -13,6 +13,9 @@
 #include <rdma/ib_user_verbs.h>
 #include <rdma/ib_verbs.h>
 #include <rdma/uverbs_ioctl.h>
+#define UVERBS_MODULE_NAME efa_ib
+#include <rdma/uverbs_named_ioctl.h>
+#include <rdma/ib_user_ioctl_cmds.h>
 
 #include "efa.h"
 #include "efa_io_defs.h"
@@ -1653,6 +1656,9 @@ static int efa_register_mr(struct ib_pd *ibpd, struct efa_mr *mr, u64 start,
 	mr->ibmr.lkey = result.l_key;
 	mr->ibmr.rkey = result.r_key;
 	mr->ibmr.length = length;
+	mr->recv_pci_bus_id = result.recv_pci_bus_id;
+	mr->rdma_read_pci_bus_id = result.rdma_read_pci_bus_id;
+	mr->rdma_recv_pci_bus_id = result.rdma_recv_pci_bus_id;
 	ibdev_dbg(&dev->ibdev, "Registered mr[%d]\n", mr->ibmr.lkey);
 
 	return 0;
@@ -1735,6 +1741,50 @@ struct ib_mr *efa_reg_mr(struct ib_pd *ibpd, u64 start, u64 length,
 	return ERR_PTR(err);
 }
 
+static int UVERBS_HANDLER(EFA_IB_METHOD_MR_QUERY)(struct uverbs_attr_bundle *attrs)
+{
+	struct ib_mr *ibmr = uverbs_attr_get_obj(attrs, EFA_IB_ATTR_QUERY_MR_HANDLE);
+	struct efa_mr *mr = to_emr(ibmr);
+	u16 rdma_read_pci_bus_id = 0;
+	u16 rdma_recv_pci_bus_id = 0;
+	u16 pci_bus_id_validity = 0;
+	u16 recv_pci_bus_id = 0;
+	int ret;
+
+	if (mr->recv_pci_bus_id != EFA_INVALID_PCI_BUS_ID) {
+		recv_pci_bus_id = mr->recv_pci_bus_id;
+		pci_bus_id_validity |= EFA_QUERY_MR_VALIDITY_RECV_PCI_BUS_ID;
+	}
+
+	if (mr->rdma_read_pci_bus_id != EFA_INVALID_PCI_BUS_ID) {
+		rdma_read_pci_bus_id = mr->rdma_read_pci_bus_id;
+		pci_bus_id_validity |= EFA_QUERY_MR_VALIDITY_RDMA_READ_PCI_BUS_ID;
+	}
+
+	if (mr->rdma_recv_pci_bus_id != EFA_INVALID_PCI_BUS_ID) {
+		rdma_recv_pci_bus_id = mr->rdma_recv_pci_bus_id;
+		pci_bus_id_validity |= EFA_QUERY_MR_VALIDITY_RDMA_RECV_PCI_BUS_ID;
+	}
+
+	ret = uverbs_copy_to(attrs, EFA_IB_ATTR_QUERY_MR_RESP_RECV_PCI_BUS_ID,
+			     &recv_pci_bus_id, sizeof(recv_pci_bus_id));
+	if (ret)
+		return ret;
+
+	ret = uverbs_copy_to(attrs, EFA_IB_ATTR_QUERY_MR_RESP_RDMA_READ_PCI_BUS_ID,
+			     &rdma_read_pci_bus_id, sizeof(rdma_read_pci_bus_id));
+	if (ret)
+		return ret;
+
+	ret = uverbs_copy_to(attrs, EFA_IB_ATTR_QUERY_MR_RESP_RDMA_RECV_PCI_BUS_ID,
+			     &rdma_recv_pci_bus_id, sizeof(rdma_recv_pci_bus_id));
+	if (ret)
+		return ret;
+
+	return uverbs_copy_to(attrs, EFA_IB_ATTR_QUERY_MR_RESP_PCI_BUS_ID_VALIDITY,
+			      &pci_bus_id_validity, sizeof(pci_bus_id_validity));
+}
+
 int efa_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
 {
 	struct efa_dev *dev = to_edev(ibmr->device);
@@ -2157,3 +2207,30 @@ enum rdma_link_layer efa_port_link_layer(struct ib_device *ibdev,
 	return IB_LINK_LAYER_UNSPECIFIED;
 }
 
+DECLARE_UVERBS_NAMED_METHOD(EFA_IB_METHOD_MR_QUERY,
+			    UVERBS_ATTR_IDR(EFA_IB_ATTR_QUERY_MR_HANDLE,
+					    UVERBS_OBJECT_MR,
+					    UVERBS_ACCESS_READ,
+					    UA_MANDATORY),
+			    UVERBS_ATTR_PTR_OUT(EFA_IB_ATTR_QUERY_MR_RESP_PCI_BUS_ID_VALIDITY,
+						UVERBS_ATTR_TYPE(u16),
+						UA_MANDATORY),
+			    UVERBS_ATTR_PTR_OUT(EFA_IB_ATTR_QUERY_MR_RESP_RECV_PCI_BUS_ID,
+						UVERBS_ATTR_TYPE(u16),
+						UA_MANDATORY),
+			    UVERBS_ATTR_PTR_OUT(EFA_IB_ATTR_QUERY_MR_RESP_RDMA_READ_PCI_BUS_ID,
+						UVERBS_ATTR_TYPE(u16),
+						UA_MANDATORY),
+			    UVERBS_ATTR_PTR_OUT(EFA_IB_ATTR_QUERY_MR_RESP_RDMA_RECV_PCI_BUS_ID,
+						UVERBS_ATTR_TYPE(u16),
+						UA_MANDATORY));
+
+ADD_UVERBS_METHODS(efa_mr,
+		   UVERBS_OBJECT_MR,
+		   &UVERBS_METHOD(EFA_IB_METHOD_MR_QUERY));
+
+const struct uapi_definition efa_uapi_defs[] = {
+	UAPI_DEF_CHAIN_OBJ_TREE(UVERBS_OBJECT_MR,
+				&efa_mr),
+	{},
+};
diff --git a/include/uapi/rdma/efa-abi.h b/include/uapi/rdma/efa-abi.h
index d94c32f28804..7ced04ca2ad9 100644
--- a/include/uapi/rdma/efa-abi.h
+++ b/include/uapi/rdma/efa-abi.h
@@ -7,6 +7,7 @@
 #define EFA_ABI_USER_H
 
 #include <linux/types.h>
+#include <rdma/ib_user_ioctl_cmds.h>
 
 /*
  * Increment this value if any changes that break userspace ABI
@@ -134,4 +135,22 @@ struct efa_ibv_ex_query_device_resp {
 	__u32 device_caps;
 };
 
+enum {
+	EFA_QUERY_MR_VALIDITY_RECV_PCI_BUS_ID = 1 << 0,
+	EFA_QUERY_MR_VALIDITY_RDMA_READ_PCI_BUS_ID = 1 << 1,
+	EFA_QUERY_MR_VALIDITY_RDMA_RECV_PCI_BUS_ID = 1 << 2,
+};
+
+enum efa_query_mr_attrs {
+	EFA_IB_ATTR_QUERY_MR_HANDLE = (1U << UVERBS_ID_NS_SHIFT),
+	EFA_IB_ATTR_QUERY_MR_RESP_PCI_BUS_ID_VALIDITY,
+	EFA_IB_ATTR_QUERY_MR_RESP_RECV_PCI_BUS_ID,
+	EFA_IB_ATTR_QUERY_MR_RESP_RDMA_READ_PCI_BUS_ID,
+	EFA_IB_ATTR_QUERY_MR_RESP_RDMA_RECV_PCI_BUS_ID,
+};
+
+enum efa_mr_methods {
+	EFA_IB_METHOD_MR_QUERY = (1U << UVERBS_ID_NS_SHIFT),
+};
+
 #endif /* EFA_ABI_USER_H */
