Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

24 files changed, 12012 insertions, 0 deletions

diff --git a/drivers/misc/mic/scif/Makefile b/drivers/misc/mic/scif/Makefile
new file mode 100644
index 000000000..ff372555d
--- /dev/null
+++ b/drivers/misc/mic/scif/Makefile
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile - SCIF driver.
+# Copyright(c) 2014, Intel Corporation.
+#
+obj-$(CONFIG_SCIF) += scif.o
+scif-objs := scif_main.o
+scif-objs += scif_peer_bus.o
+scif-objs += scif_ports.o
+scif-objs += scif_debugfs.o
+scif-objs += scif_fd.o
+scif-objs += scif_api.o
+scif-objs += scif_epd.o
+scif-objs += scif_rb.o
+scif-objs += scif_nodeqp.o
+scif-objs += scif_nm.o
+scif-objs += scif_dma.o
+scif-objs += scif_fence.o
+scif-objs += scif_mmap.o
+scif-objs += scif_rma.o
+scif-objs += scif_rma_list.o
diff --git a/drivers/misc/mic/scif/scif_api.c b/drivers/misc/mic/scif/scif_api.c
new file mode 100644
index 000000000..8dd0ccede
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_api.c
@@ -0,0 +1,1496 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include <linux/scif.h>
+#include "scif_main.h"
+#include "scif_map.h"
+
+static const char * const scif_ep_states[] = {
+	"Unbound",
+	"Bound",
+	"Listening",
+	"Connected",
+	"Connecting",
+	"Mapping",
+	"Closing",
+	"Close Listening",
+	"Disconnected",
+	"Zombie"};
+
+enum conn_async_state {
+	ASYNC_CONN_IDLE = 1,	/* ep setup for async connect */
+	ASYNC_CONN_INPROGRESS,	/* async connect in progress */
+	ASYNC_CONN_FLUSH_WORK	/* async work flush in progress  */
+};
+
+/*
+ * File operations for anonymous inode file associated with a SCIF endpoint,
+ * used in kernel mode SCIF poll. Kernel mode SCIF poll calls portions of the
+ * poll API in the kernel and these take in a struct file *. Since a struct
+ * file is not available to kernel mode SCIF, it uses an anonymous file for
+ * this purpose.
+ */
+const struct file_operations scif_anon_fops = {
+	.owner = THIS_MODULE,
+};
+
+scif_epd_t scif_open(void)
+{
+	struct scif_endpt *ep;
+	int err;
+
+	might_sleep();
+	ep = kzalloc(sizeof(*ep), GFP_KERNEL);
+	if (!ep)
+		goto err_ep_alloc;
+
+	ep->qp_info.qp = kzalloc(sizeof(*ep->qp_info.qp), GFP_KERNEL);
+	if (!ep->qp_info.qp)
+		goto err_qp_alloc;
+
+	err = scif_anon_inode_getfile(ep);
+	if (err)
+		goto err_anon_inode;
+
+	spin_lock_init(&ep->lock);
+	mutex_init(&ep->sendlock);
+	mutex_init(&ep->recvlock);
+
+	scif_rma_ep_init(ep);
+	ep->state = SCIFEP_UNBOUND;
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI open: ep %p success\n", ep);
+	return ep;
+
+err_anon_inode:
+	kfree(ep->qp_info.qp);
+err_qp_alloc:
+	kfree(ep);
+err_ep_alloc:
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(scif_open);
+
+/*
+ * scif_disconnect_ep - Disconnects the endpoint if found
+ * @epd: The end point returned from scif_open()
+ */
+static struct scif_endpt *scif_disconnect_ep(struct scif_endpt *ep)
+{
+	struct scifmsg msg;
+	struct scif_endpt *fep = NULL;
+	struct scif_endpt *tmpep;
+	struct list_head *pos, *tmpq;
+	int err;
+
+	/*
+	 * Wake up any threads blocked in send()/recv() before closing
+	 * out the connection. Grabbing and releasing the send/recv lock
+	 * will ensure that any blocked senders/receivers have exited for
+	 * Ring 0 endpoints. It is a Ring 0 bug to call send/recv after
+	 * close. Ring 3 endpoints are not affected since close will not
+	 * be called while there are IOCTLs executing.
+	 */
+	wake_up_interruptible(&ep->sendwq);
+	wake_up_interruptible(&ep->recvwq);
+	mutex_lock(&ep->sendlock);
+	mutex_unlock(&ep->sendlock);
+	mutex_lock(&ep->recvlock);
+	mutex_unlock(&ep->recvlock);
+
+	/* Remove from the connected list */
+	mutex_lock(&scif_info.connlock);
+	list_for_each_safe(pos, tmpq, &scif_info.connected) {
+		tmpep = list_entry(pos, struct scif_endpt, list);
+		if (tmpep == ep) {
+			list_del(pos);
+			fep = tmpep;
+			spin_lock(&ep->lock);
+			break;
+		}
+	}
+
+	if (!fep) {
+		/*
+		 * The other side has completed the disconnect before
+		 * the end point can be removed from the list. Therefore
+		 * the ep lock is not locked, traverse the disconnected
+		 * list to find the endpoint and release the conn lock.
+		 */
+		list_for_each_safe(pos, tmpq, &scif_info.disconnected) {
+			tmpep = list_entry(pos, struct scif_endpt, list);
+			if (tmpep == ep) {
+				list_del(pos);
+				break;
+			}
+		}
+		mutex_unlock(&scif_info.connlock);
+		return NULL;
+	}
+
+	init_completion(&ep->discon);
+	msg.uop = SCIF_DISCNCT;
+	msg.src = ep->port;
+	msg.dst = ep->peer;
+	msg.payload[0] = (u64)ep;
+	msg.payload[1] = ep->remote_ep;
+
+	err = scif_nodeqp_send(ep->remote_dev, &msg);
+	spin_unlock(&ep->lock);
+	mutex_unlock(&scif_info.connlock);
+
+	if (!err)
+		/* Wait for the remote node to respond with SCIF_DISCNT_ACK */
+		wait_for_completion_timeout(&ep->discon,
+					    SCIF_NODE_ALIVE_TIMEOUT);
+	return ep;
+}
+
+int scif_close(scif_epd_t epd)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	struct scif_endpt *tmpep;
+	struct list_head *pos, *tmpq;
+	enum scif_epd_state oldstate;
+	bool flush_conn;
+
+	dev_dbg(scif_info.mdev.this_device, "SCIFAPI close: ep %p %s\n",
+		ep, scif_ep_states[ep->state]);
+	might_sleep();
+	spin_lock(&ep->lock);
+	flush_conn = (ep->conn_async_state == ASYNC_CONN_INPROGRESS);
+	spin_unlock(&ep->lock);
+
+	if (flush_conn)
+		flush_work(&scif_info.conn_work);
+
+	spin_lock(&ep->lock);
+	oldstate = ep->state;
+
+	ep->state = SCIFEP_CLOSING;
+
+	switch (oldstate) {
+	case SCIFEP_ZOMBIE:
+		dev_err(scif_info.mdev.this_device,
+			"SCIFAPI close: zombie state unexpected\n");
+		/* fall through */
+	case SCIFEP_DISCONNECTED:
+		spin_unlock(&ep->lock);
+		scif_unregister_all_windows(epd);
+		/* Remove from the disconnected list */
+		mutex_lock(&scif_info.connlock);
+		list_for_each_safe(pos, tmpq, &scif_info.disconnected) {
+			tmpep = list_entry(pos, struct scif_endpt, list);
+			if (tmpep == ep) {
+				list_del(pos);
+				break;
+			}
+		}
+		mutex_unlock(&scif_info.connlock);
+		break;
+	case SCIFEP_UNBOUND:
+	case SCIFEP_BOUND:
+	case SCIFEP_CONNECTING:
+		spin_unlock(&ep->lock);
+		break;
+	case SCIFEP_MAPPING:
+	case SCIFEP_CONNECTED:
+	case SCIFEP_CLOSING:
+	{
+		spin_unlock(&ep->lock);
+		scif_unregister_all_windows(epd);
+		scif_disconnect_ep(ep);
+		break;
+	}
+	case SCIFEP_LISTENING:
+	case SCIFEP_CLLISTEN:
+	{
+		struct scif_conreq *conreq;
+		struct scifmsg msg;
+		struct scif_endpt *aep;
+
+		spin_unlock(&ep->lock);
+		mutex_lock(&scif_info.eplock);
+
+		/* remove from listen list */
+		list_for_each_safe(pos, tmpq, &scif_info.listen) {
+			tmpep = list_entry(pos, struct scif_endpt, list);
+			if (tmpep == ep)
+				list_del(pos);
+		}
+		/* Remove any dangling accepts */
+		while (ep->acceptcnt) {
+			aep = list_first_entry(&ep->li_accept,
+					       struct scif_endpt, liacceptlist);
+			list_del(&aep->liacceptlist);
+			scif_put_port(aep->port.port);
+			list_for_each_safe(pos, tmpq, &scif_info.uaccept) {
+				tmpep = list_entry(pos, struct scif_endpt,
+						   miacceptlist);
+				if (tmpep == aep) {
+					list_del(pos);
+					break;
+				}
+			}
+			mutex_unlock(&scif_info.eplock);
+			mutex_lock(&scif_info.connlock);
+			list_for_each_safe(pos, tmpq, &scif_info.connected) {
+				tmpep = list_entry(pos,
+						   struct scif_endpt, list);
+				if (tmpep == aep) {
+					list_del(pos);
+					break;
+				}
+			}
+			list_for_each_safe(pos, tmpq, &scif_info.disconnected) {
+				tmpep = list_entry(pos,
+						   struct scif_endpt, list);
+				if (tmpep == aep) {
+					list_del(pos);
+					break;
+				}
+			}
+			mutex_unlock(&scif_info.connlock);
+			scif_teardown_ep(aep);
+			mutex_lock(&scif_info.eplock);
+			scif_add_epd_to_zombie_list(aep, SCIF_EPLOCK_HELD);
+			ep->acceptcnt--;
+		}
+
+		spin_lock(&ep->lock);
+		mutex_unlock(&scif_info.eplock);
+
+		/* Remove and reject any pending connection requests. */
+		while (ep->conreqcnt) {
+			conreq = list_first_entry(&ep->conlist,
+						  struct scif_conreq, list);
+			list_del(&conreq->list);
+
+			msg.uop = SCIF_CNCT_REJ;
+			msg.dst.node = conreq->msg.src.node;
+			msg.dst.port = conreq->msg.src.port;
+			msg.payload[0] = conreq->msg.payload[0];
+			msg.payload[1] = conreq->msg.payload[1];
+			/*
+			 * No Error Handling on purpose for scif_nodeqp_send().
+			 * If the remote node is lost we still want free the
+			 * connection requests on the self node.
+			 */
+			scif_nodeqp_send(&scif_dev[conreq->msg.src.node],
+					 &msg);
+			ep->conreqcnt--;
+			kfree(conreq);
+		}
+
+		spin_unlock(&ep->lock);
+		/* If a kSCIF accept is waiting wake it up */
+		wake_up_interruptible(&ep->conwq);
+		break;
+	}
+	}
+	scif_put_port(ep->port.port);
+	scif_anon_inode_fput(ep);
+	scif_teardown_ep(ep);
+	scif_add_epd_to_zombie_list(ep, !SCIF_EPLOCK_HELD);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(scif_close);
+
+/**
+ * scif_flush() - Wakes up any blocking accepts. The endpoint will no longer
+ *			accept new connections.
+ * @epd: The end point returned from scif_open()
+ */
+int __scif_flush(scif_epd_t epd)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+
+	switch (ep->state) {
+	case SCIFEP_LISTENING:
+	{
+		ep->state = SCIFEP_CLLISTEN;
+
+		/* If an accept is waiting wake it up */
+		wake_up_interruptible(&ep->conwq);
+		break;
+	}
+	default:
+		break;
+	}
+	return 0;
+}
+
+int scif_bind(scif_epd_t epd, u16 pn)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	int ret = 0;
+	int tmp;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI bind: ep %p %s requested port number %d\n",
+		ep, scif_ep_states[ep->state], pn);
+	if (pn) {
+		/*
+		 * Similar to IETF RFC 1700, SCIF ports below
+		 * SCIF_ADMIN_PORT_END can only be bound by system (or root)
+		 * processes or by processes executed by privileged users.
+		 */
+		if (pn < SCIF_ADMIN_PORT_END && !capable(CAP_SYS_ADMIN)) {
+			ret = -EACCES;
+			goto scif_bind_admin_exit;
+		}
+	}
+
+	spin_lock(&ep->lock);
+	if (ep->state == SCIFEP_BOUND) {
+		ret = -EINVAL;
+		goto scif_bind_exit;
+	} else if (ep->state != SCIFEP_UNBOUND) {
+		ret = -EISCONN;
+		goto scif_bind_exit;
+	}
+
+	if (pn) {
+		tmp = scif_rsrv_port(pn);
+		if (tmp != pn) {
+			ret = -EINVAL;
+			goto scif_bind_exit;
+		}
+	} else {
+		ret = scif_get_new_port();
+		if (ret < 0)
+			goto scif_bind_exit;
+		pn = ret;
+	}
+
+	ep->state = SCIFEP_BOUND;
+	ep->port.node = scif_info.nodeid;
+	ep->port.port = pn;
+	ep->conn_async_state = ASYNC_CONN_IDLE;
+	ret = pn;
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI bind: bound to port number %d\n", pn);
+scif_bind_exit:
+	spin_unlock(&ep->lock);
+scif_bind_admin_exit:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(scif_bind);
+
+int scif_listen(scif_epd_t epd, int backlog)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI listen: ep %p %s\n", ep, scif_ep_states[ep->state]);
+	spin_lock(&ep->lock);
+	switch (ep->state) {
+	case SCIFEP_ZOMBIE:
+	case SCIFEP_CLOSING:
+	case SCIFEP_CLLISTEN:
+	case SCIFEP_UNBOUND:
+	case SCIFEP_DISCONNECTED:
+		spin_unlock(&ep->lock);
+		return -EINVAL;
+	case SCIFEP_LISTENING:
+	case SCIFEP_CONNECTED:
+	case SCIFEP_CONNECTING:
+	case SCIFEP_MAPPING:
+		spin_unlock(&ep->lock);
+		return -EISCONN;
+	case SCIFEP_BOUND:
+		break;
+	}
+
+	ep->state = SCIFEP_LISTENING;
+	ep->backlog = backlog;
+
+	ep->conreqcnt = 0;
+	ep->acceptcnt = 0;
+	INIT_LIST_HEAD(&ep->conlist);
+	init_waitqueue_head(&ep->conwq);
+	INIT_LIST_HEAD(&ep->li_accept);
+	spin_unlock(&ep->lock);
+
+	/*
+	 * Listen status is complete so delete the qp information not needed
+	 * on a listen before placing on the list of listening ep's
+	 */
+	scif_teardown_ep(ep);
+	ep->qp_info.qp = NULL;
+
+	mutex_lock(&scif_info.eplock);
+	list_add_tail(&ep->list, &scif_info.listen);
+	mutex_unlock(&scif_info.eplock);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(scif_listen);
+
+/*
+ ************************************************************************
+ * SCIF connection flow:
+ *
+ * 1) A SCIF listening endpoint can call scif_accept(..) to wait for SCIF
+ *	connections via a SCIF_CNCT_REQ message
+ * 2) A SCIF endpoint can initiate a SCIF connection by calling
+ *	scif_connect(..) which calls scif_setup_qp_connect(..) which
+ *	allocates the local qp for the endpoint ring buffer and then sends
+ *	a SCIF_CNCT_REQ to the remote node and waits for a SCIF_CNCT_GNT or
+ *	a SCIF_CNCT_REJ message
+ * 3) The peer node handles a SCIF_CNCT_REQ via scif_cnctreq_resp(..) which
+ *	wakes up any threads blocked in step 1 or sends a SCIF_CNCT_REJ
+ *	message otherwise
+ * 4) A thread blocked waiting for incoming connections allocates its local
+ *	endpoint QP and ring buffer following which it sends a SCIF_CNCT_GNT
+ *	and waits for a SCIF_CNCT_GNT(N)ACK. If the allocation fails then
+ *	the node sends a SCIF_CNCT_REJ message
+ * 5) Upon receipt of a SCIF_CNCT_GNT or a SCIF_CNCT_REJ message the
+ *	connecting endpoint is woken up as part of handling
+ *	scif_cnctgnt_resp(..) following which it maps the remote endpoints'
+ *	QP, updates its outbound QP and sends a SCIF_CNCT_GNTACK message on
+ *	success or a SCIF_CNCT_GNTNACK message on failure and completes
+ *	the scif_connect(..) API
+ * 6) Upon receipt of a SCIF_CNCT_GNT(N)ACK the accepting endpoint blocked
+ *	in step 4 is woken up and completes the scif_accept(..) API
+ * 7) The SCIF connection is now established between the two SCIF endpoints.
+ */
+static int scif_conn_func(struct scif_endpt *ep)
+{
+	int err = 0;
+	struct scifmsg msg;
+	struct device *spdev;
+
+	err = scif_reserve_dma_chan(ep);
+	if (err) {
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %d\n", __func__, __LINE__, err);
+		ep->state = SCIFEP_BOUND;
+		goto connect_error_simple;
+	}
+	/* Initiate the first part of the endpoint QP setup */
+	err = scif_setup_qp_connect(ep->qp_info.qp, &ep->qp_info.qp_offset,
+				    SCIF_ENDPT_QP_SIZE, ep->remote_dev);
+	if (err) {
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s err %d qp_offset 0x%llx\n",
+			__func__, err, ep->qp_info.qp_offset);
+		ep->state = SCIFEP_BOUND;
+		goto connect_error_simple;
+	}
+
+	spdev = scif_get_peer_dev(ep->remote_dev);
+	if (IS_ERR(spdev)) {
+		err = PTR_ERR(spdev);
+		goto cleanup_qp;
+	}
+	/* Format connect message and send it */
+	msg.src = ep->port;
+	msg.dst = ep->conn_port;
+	msg.uop = SCIF_CNCT_REQ;
+	msg.payload[0] = (u64)ep;
+	msg.payload[1] = ep->qp_info.qp_offset;
+	err = _scif_nodeqp_send(ep->remote_dev, &msg);
+	if (err)
+		goto connect_error_dec;
+	scif_put_peer_dev(spdev);
+	/*
+	 * Wait for the remote node to respond with SCIF_CNCT_GNT or
+	 * SCIF_CNCT_REJ message.
+	 */
+	err = wait_event_timeout(ep->conwq, ep->state != SCIFEP_CONNECTING,
+				 SCIF_NODE_ALIVE_TIMEOUT);
+	if (!err) {
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d timeout\n", __func__, __LINE__);
+		ep->state = SCIFEP_BOUND;
+	}
+	spdev = scif_get_peer_dev(ep->remote_dev);
+	if (IS_ERR(spdev)) {
+		err = PTR_ERR(spdev);
+		goto cleanup_qp;
+	}
+	if (ep->state == SCIFEP_MAPPING) {
+		err = scif_setup_qp_connect_response(ep->remote_dev,
+						     ep->qp_info.qp,
+						     ep->qp_info.gnt_pld);
+		/*
+		 * If the resource to map the queue are not available then
+		 * we need to tell the other side to terminate the accept
+		 */
+		if (err) {
+			dev_err(&ep->remote_dev->sdev->dev,
+				"%s %d err %d\n", __func__, __LINE__, err);
+			msg.uop = SCIF_CNCT_GNTNACK;
+			msg.payload[0] = ep->remote_ep;
+			_scif_nodeqp_send(ep->remote_dev, &msg);
+			ep->state = SCIFEP_BOUND;
+			goto connect_error_dec;
+		}
+
+		msg.uop = SCIF_CNCT_GNTACK;
+		msg.payload[0] = ep->remote_ep;
+		err = _scif_nodeqp_send(ep->remote_dev, &msg);
+		if (err) {
+			ep->state = SCIFEP_BOUND;
+			goto connect_error_dec;
+		}
+		ep->state = SCIFEP_CONNECTED;
+		mutex_lock(&scif_info.connlock);
+		list_add_tail(&ep->list, &scif_info.connected);
+		mutex_unlock(&scif_info.connlock);
+		dev_dbg(&ep->remote_dev->sdev->dev,
+			"SCIFAPI connect: ep %p connected\n", ep);
+	} else if (ep->state == SCIFEP_BOUND) {
+		dev_dbg(&ep->remote_dev->sdev->dev,
+			"SCIFAPI connect: ep %p connection refused\n", ep);
+		err = -ECONNREFUSED;
+		goto connect_error_dec;
+	}
+	scif_put_peer_dev(spdev);
+	return err;
+connect_error_dec:
+	scif_put_peer_dev(spdev);
+cleanup_qp:
+	scif_cleanup_ep_qp(ep);
+connect_error_simple:
+	return err;
+}
+
+/*
+ * scif_conn_handler:
+ *
+ * Workqueue handler for servicing non-blocking SCIF connect
+ *
+ */
+void scif_conn_handler(struct work_struct *work)
+{
+	struct scif_endpt *ep;
+
+	do {
+		ep = NULL;
+		spin_lock(&scif_info.nb_connect_lock);
+		if (!list_empty(&scif_info.nb_connect_list)) {
+			ep = list_first_entry(&scif_info.nb_connect_list,
+					      struct scif_endpt, conn_list);
+			list_del(&ep->conn_list);
+		}
+		spin_unlock(&scif_info.nb_connect_lock);
+		if (ep) {
+			ep->conn_err = scif_conn_func(ep);
+			wake_up_interruptible(&ep->conn_pend_wq);
+		}
+	} while (ep);
+}
+
+int __scif_connect(scif_epd_t epd, struct scif_port_id *dst, bool non_block)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	int err = 0;
+	struct scif_dev *remote_dev;
+	struct device *spdev;
+
+	dev_dbg(scif_info.mdev.this_device, "SCIFAPI connect: ep %p %s\n", ep,
+		scif_ep_states[ep->state]);
+
+	if (!scif_dev || dst->node > scif_info.maxid)
+		return -ENODEV;
+
+	might_sleep();
+
+	remote_dev = &scif_dev[dst->node];
+	spdev = scif_get_peer_dev(remote_dev);
+	if (IS_ERR(spdev)) {
+		err = PTR_ERR(spdev);
+		return err;
+	}
+
+	spin_lock(&ep->lock);
+	switch (ep->state) {
+	case SCIFEP_ZOMBIE:
+	case SCIFEP_CLOSING:
+		err = -EINVAL;
+		break;
+	case SCIFEP_DISCONNECTED:
+		if (ep->conn_async_state == ASYNC_CONN_INPROGRESS)
+			ep->conn_async_state = ASYNC_CONN_FLUSH_WORK;
+		else
+			err = -EINVAL;
+		break;
+	case SCIFEP_LISTENING:
+	case SCIFEP_CLLISTEN:
+		err = -EOPNOTSUPP;
+		break;
+	case SCIFEP_CONNECTING:
+	case SCIFEP_MAPPING:
+		if (ep->conn_async_state == ASYNC_CONN_INPROGRESS)
+			err = -EINPROGRESS;
+		else
+			err = -EISCONN;
+		break;
+	case SCIFEP_CONNECTED:
+		if (ep->conn_async_state == ASYNC_CONN_INPROGRESS)
+			ep->conn_async_state = ASYNC_CONN_FLUSH_WORK;
+		else
+			err = -EISCONN;
+		break;
+	case SCIFEP_UNBOUND:
+		err = scif_get_new_port();
+		if (err < 0)
+			break;
+		ep->port.port = err;
+		ep->port.node = scif_info.nodeid;
+		ep->conn_async_state = ASYNC_CONN_IDLE;
+		/* Fall through */
+	case SCIFEP_BOUND:
+		/*
+		 * If a non-blocking connect has been already initiated
+		 * (conn_async_state is either ASYNC_CONN_INPROGRESS or
+		 * ASYNC_CONN_FLUSH_WORK), the end point could end up in
+		 * SCIF_BOUND due an error in the connection process
+		 * (e.g., connection refused) If conn_async_state is
+		 * ASYNC_CONN_INPROGRESS - transition to ASYNC_CONN_FLUSH_WORK
+		 * so that the error status can be collected. If the state is
+		 * already ASYNC_CONN_FLUSH_WORK - then set the error to
+		 * EINPROGRESS since some other thread is waiting to collect
+		 * error status.
+		 */
+		if (ep->conn_async_state == ASYNC_CONN_INPROGRESS) {
+			ep->conn_async_state = ASYNC_CONN_FLUSH_WORK;
+		} else if (ep->conn_async_state == ASYNC_CONN_FLUSH_WORK) {
+			err = -EINPROGRESS;
+		} else {
+			ep->conn_port = *dst;
+			init_waitqueue_head(&ep->sendwq);
+			init_waitqueue_head(&ep->recvwq);
+			init_waitqueue_head(&ep->conwq);
+			ep->conn_async_state = 0;
+
+			if (unlikely(non_block))
+				ep->conn_async_state = ASYNC_CONN_INPROGRESS;
+		}
+		break;
+	}
+
+	if (err || ep->conn_async_state == ASYNC_CONN_FLUSH_WORK)
+			goto connect_simple_unlock1;
+
+	ep->state = SCIFEP_CONNECTING;
+	ep->remote_dev = &scif_dev[dst->node];
+	ep->qp_info.qp->magic = SCIFEP_MAGIC;
+	if (ep->conn_async_state == ASYNC_CONN_INPROGRESS) {
+		init_waitqueue_head(&ep->conn_pend_wq);
+		spin_lock(&scif_info.nb_connect_lock);
+		list_add_tail(&ep->conn_list, &scif_info.nb_connect_list);
+		spin_unlock(&scif_info.nb_connect_lock);
+		err = -EINPROGRESS;
+		schedule_work(&scif_info.conn_work);
+	}
+connect_simple_unlock1:
+	spin_unlock(&ep->lock);
+	scif_put_peer_dev(spdev);
+	if (err) {
+		return err;
+	} else if (ep->conn_async_state == ASYNC_CONN_FLUSH_WORK) {
+		flush_work(&scif_info.conn_work);
+		err = ep->conn_err;
+		spin_lock(&ep->lock);
+		ep->conn_async_state = ASYNC_CONN_IDLE;
+		spin_unlock(&ep->lock);
+	} else {
+		err = scif_conn_func(ep);
+	}
+	return err;
+}
+
+int scif_connect(scif_epd_t epd, struct scif_port_id *dst)
+{
+	return __scif_connect(epd, dst, false);
+}
+EXPORT_SYMBOL_GPL(scif_connect);
+
+/**
+ * scif_accept() - Accept a connection request from the remote node
+ *
+ * The function accepts a connection request from the remote node.  Successful
+ * complete is indicate by a new end point being created and passed back
+ * to the caller for future reference.
+ *
+ * Upon successful complete a zero will be returned and the peer information
+ * will be filled in.
+ *
+ * If the end point is not in the listening state -EINVAL will be returned.
+ *
+ * If during the connection sequence resource allocation fails the -ENOMEM
+ * will be returned.
+ *
+ * If the function is called with the ASYNC flag set and no connection requests
+ * are pending it will return -EAGAIN.
+ *
+ * If the remote side is not sending any connection requests the caller may
+ * terminate this function with a signal.  If so a -EINTR will be returned.
+ */
+int scif_accept(scif_epd_t epd, struct scif_port_id *peer,
+		scif_epd_t *newepd, int flags)
+{
+	struct scif_endpt *lep = (struct scif_endpt *)epd;
+	struct scif_endpt *cep;
+	struct scif_conreq *conreq;
+	struct scifmsg msg;
+	int err;
+	struct device *spdev;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI accept: ep %p %s\n", lep, scif_ep_states[lep->state]);
+
+	if (flags & ~SCIF_ACCEPT_SYNC)
+		return -EINVAL;
+
+	if (!peer || !newepd)
+		return -EINVAL;
+
+	might_sleep();
+	spin_lock(&lep->lock);
+	if (lep->state != SCIFEP_LISTENING) {
+		spin_unlock(&lep->lock);
+		return -EINVAL;
+	}
+
+	if (!lep->conreqcnt && !(flags & SCIF_ACCEPT_SYNC)) {
+		/* No connection request present and we do not want to wait */
+		spin_unlock(&lep->lock);
+		return -EAGAIN;
+	}
+
+	lep->files = current->files;
+retry_connection:
+	spin_unlock(&lep->lock);
+	/* Wait for the remote node to send us a SCIF_CNCT_REQ */
+	err = wait_event_interruptible(lep->conwq,
+				       (lep->conreqcnt ||
+				       (lep->state != SCIFEP_LISTENING)));
+	if (err)
+		return err;
+
+	if (lep->state != SCIFEP_LISTENING)
+		return -EINTR;
+
+	spin_lock(&lep->lock);
+
+	if (!lep->conreqcnt)
+		goto retry_connection;
+
+	/* Get the first connect request off the list */
+	conreq = list_first_entry(&lep->conlist, struct scif_conreq, list);
+	list_del(&conreq->list);
+	lep->conreqcnt--;
+	spin_unlock(&lep->lock);
+
+	/* Fill in the peer information */
+	peer->node = conreq->msg.src.node;
+	peer->port = conreq->msg.src.port;
+
+	cep = kzalloc(sizeof(*cep), GFP_KERNEL);
+	if (!cep) {
+		err = -ENOMEM;
+		goto scif_accept_error_epalloc;
+	}
+	spin_lock_init(&cep->lock);
+	mutex_init(&cep->sendlock);
+	mutex_init(&cep->recvlock);
+	cep->state = SCIFEP_CONNECTING;
+	cep->remote_dev = &scif_dev[peer->node];
+	cep->remote_ep = conreq->msg.payload[0];
+
+	scif_rma_ep_init(cep);
+
+	err = scif_reserve_dma_chan(cep);
+	if (err) {
+		dev_err(scif_info.mdev.this_device,
+			"%s %d err %d\n", __func__, __LINE__, err);
+		goto scif_accept_error_qpalloc;
+	}
+
+	cep->qp_info.qp = kzalloc(sizeof(*cep->qp_info.qp), GFP_KERNEL);
+	if (!cep->qp_info.qp) {
+		err = -ENOMEM;
+		goto scif_accept_error_qpalloc;
+	}
+
+	err = scif_anon_inode_getfile(cep);
+	if (err)
+		goto scif_accept_error_anon_inode;
+
+	cep->qp_info.qp->magic = SCIFEP_MAGIC;
+	spdev = scif_get_peer_dev(cep->remote_dev);
+	if (IS_ERR(spdev)) {
+		err = PTR_ERR(spdev);
+		goto scif_accept_error_map;
+	}
+	err = scif_setup_qp_accept(cep->qp_info.qp, &cep->qp_info.qp_offset,
+				   conreq->msg.payload[1], SCIF_ENDPT_QP_SIZE,
+				   cep->remote_dev);
+	if (err) {
+		dev_dbg(&cep->remote_dev->sdev->dev,
+			"SCIFAPI accept: ep %p new %p scif_setup_qp_accept %d qp_offset 0x%llx\n",
+			lep, cep, err, cep->qp_info.qp_offset);
+		scif_put_peer_dev(spdev);
+		goto scif_accept_error_map;
+	}
+
+	cep->port.node = lep->port.node;
+	cep->port.port = lep->port.port;
+	cep->peer.node = peer->node;
+	cep->peer.port = peer->port;
+	init_waitqueue_head(&cep->sendwq);
+	init_waitqueue_head(&cep->recvwq);
+	init_waitqueue_head(&cep->conwq);
+
+	msg.uop = SCIF_CNCT_GNT;
+	msg.src = cep->port;
+	msg.payload[0] = cep->remote_ep;
+	msg.payload[1] = cep->qp_info.qp_offset;
+	msg.payload[2] = (u64)cep;
+
+	err = _scif_nodeqp_send(cep->remote_dev, &msg);
+	scif_put_peer_dev(spdev);
+	if (err)
+		goto scif_accept_error_map;
+retry:
+	/* Wait for the remote node to respond with SCIF_CNCT_GNT(N)ACK */
+	err = wait_event_timeout(cep->conwq, cep->state != SCIFEP_CONNECTING,
+				 SCIF_NODE_ACCEPT_TIMEOUT);
+	if (!err && scifdev_alive(cep))
+		goto retry;
+	err = !err ? -ENODEV : 0;
+	if (err)
+		goto scif_accept_error_map;
+	kfree(conreq);
+
+	spin_lock(&cep->lock);
+
+	if (cep->state == SCIFEP_CLOSING) {
+		/*
+		 * Remote failed to allocate resources and NAKed the grant.
+		 * There is at this point nothing referencing the new end point.
+		 */
+		spin_unlock(&cep->lock);
+		scif_teardown_ep(cep);
+		kfree(cep);
+
+		/* If call with sync flag then go back and wait. */
+		if (flags & SCIF_ACCEPT_SYNC) {
+			spin_lock(&lep->lock);
+			goto retry_connection;
+		}
+		return -EAGAIN;
+	}
+
+	scif_get_port(cep->port.port);
+	*newepd = (scif_epd_t)cep;
+	spin_unlock(&cep->lock);
+	return 0;
+scif_accept_error_map:
+	scif_anon_inode_fput(cep);
+scif_accept_error_anon_inode:
+	scif_teardown_ep(cep);
+scif_accept_error_qpalloc:
+	kfree(cep);
+scif_accept_error_epalloc:
+	msg.uop = SCIF_CNCT_REJ;
+	msg.dst.node = conreq->msg.src.node;
+	msg.dst.port = conreq->msg.src.port;
+	msg.payload[0] = conreq->msg.payload[0];
+	msg.payload[1] = conreq->msg.payload[1];
+	scif_nodeqp_send(&scif_dev[conreq->msg.src.node], &msg);
+	kfree(conreq);
+	return err;
+}
+EXPORT_SYMBOL_GPL(scif_accept);
+
+/*
+ * scif_msg_param_check:
+ * @epd: The end point returned from scif_open()
+ * @len: Length to receive
+ * @flags: blocking or non blocking
+ *
+ * Validate parameters for messaging APIs scif_send(..)/scif_recv(..).
+ */
+static inline int scif_msg_param_check(scif_epd_t epd, int len, int flags)
+{
+	int ret = -EINVAL;
+
+	if (len < 0)
+		goto err_ret;
+	if (flags && (!(flags & SCIF_RECV_BLOCK)))
+		goto err_ret;
+	ret = 0;
+err_ret:
+	return ret;
+}
+
+static int _scif_send(scif_epd_t epd, void *msg, int len, int flags)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	struct scifmsg notif_msg;
+	int curr_xfer_len = 0, sent_len = 0, write_count;
+	int ret = 0;
+	struct scif_qp *qp = ep->qp_info.qp;
+
+	if (flags & SCIF_SEND_BLOCK)
+		might_sleep();
+
+	spin_lock(&ep->lock);
+	while (sent_len != len && SCIFEP_CONNECTED == ep->state) {
+		write_count = scif_rb_space(&qp->outbound_q);
+		if (write_count) {
+			/* Best effort to send as much data as possible */
+			curr_xfer_len = min(len - sent_len, write_count);
+			ret = scif_rb_write(&qp->outbound_q, msg,
+					    curr_xfer_len);
+			if (ret < 0)
+				break;
+			/* Success. Update write pointer */
+			scif_rb_commit(&qp->outbound_q);
+			/*
+			 * Send a notification to the peer about the
+			 * produced data message.
+			 */
+			notif_msg.src = ep->port;
+			notif_msg.uop = SCIF_CLIENT_SENT;
+			notif_msg.payload[0] = ep->remote_ep;
+			ret = _scif_nodeqp_send(ep->remote_dev, &notif_msg);
+			if (ret)
+				break;
+			sent_len += curr_xfer_len;
+			msg = msg + curr_xfer_len;
+			continue;
+		}
+		curr_xfer_len = min(len - sent_len, SCIF_ENDPT_QP_SIZE - 1);
+		/* Not enough RB space. return for the Non Blocking case */
+		if (!(flags & SCIF_SEND_BLOCK))
+			break;
+
+		spin_unlock(&ep->lock);
+		/* Wait for a SCIF_CLIENT_RCVD message in the Blocking case */
+		ret =
+		wait_event_interruptible(ep->sendwq,
+					 (SCIFEP_CONNECTED != ep->state) ||
+					 (scif_rb_space(&qp->outbound_q) >=
+					 curr_xfer_len));
+		spin_lock(&ep->lock);
+		if (ret)
+			break;
+	}
+	if (sent_len)
+		ret = sent_len;
+	else if (!ret && SCIFEP_CONNECTED != ep->state)
+		ret = SCIFEP_DISCONNECTED == ep->state ?
+			-ECONNRESET : -ENOTCONN;
+	spin_unlock(&ep->lock);
+	return ret;
+}
+
+static int _scif_recv(scif_epd_t epd, void *msg, int len, int flags)
+{
+	int read_size;
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	struct scifmsg notif_msg;
+	int curr_recv_len = 0, remaining_len = len, read_count;
+	int ret = 0;
+	struct scif_qp *qp = ep->qp_info.qp;
+
+	if (flags & SCIF_RECV_BLOCK)
+		might_sleep();
+	spin_lock(&ep->lock);
+	while (remaining_len && (SCIFEP_CONNECTED == ep->state ||
+				 SCIFEP_DISCONNECTED == ep->state)) {
+		read_count = scif_rb_count(&qp->inbound_q, remaining_len);
+		if (read_count) {
+			/*
+			 * Best effort to recv as much data as there
+			 * are bytes to read in the RB particularly
+			 * important for the Non Blocking case.
+			 */
+			curr_recv_len = min(remaining_len, read_count);
+			read_size = scif_rb_get_next(&qp->inbound_q,
+						     msg, curr_recv_len);
+			if (ep->state == SCIFEP_CONNECTED) {
+				/*
+				 * Update the read pointer only if the endpoint
+				 * is still connected else the read pointer
+				 * might no longer exist since the peer has
+				 * freed resources!
+				 */
+				scif_rb_update_read_ptr(&qp->inbound_q);
+				/*
+				 * Send a notification to the peer about the
+				 * consumed data message only if the EP is in
+				 * SCIFEP_CONNECTED state.
+				 */
+				notif_msg.src = ep->port;
+				notif_msg.uop = SCIF_CLIENT_RCVD;
+				notif_msg.payload[0] = ep->remote_ep;
+				ret = _scif_nodeqp_send(ep->remote_dev,
+							&notif_msg);
+				if (ret)
+					break;
+			}
+			remaining_len -= curr_recv_len;
+			msg = msg + curr_recv_len;
+			continue;
+		}
+		/*
+		 * Bail out now if the EP is in SCIFEP_DISCONNECTED state else
+		 * we will keep looping forever.
+		 */
+		if (ep->state == SCIFEP_DISCONNECTED)
+			break;
+		/*
+		 * Return in the Non Blocking case if there is no data
+		 * to read in this iteration.
+		 */
+		if (!(flags & SCIF_RECV_BLOCK))
+			break;
+		curr_recv_len = min(remaining_len, SCIF_ENDPT_QP_SIZE - 1);
+		spin_unlock(&ep->lock);
+		/*
+		 * Wait for a SCIF_CLIENT_SEND message in the blocking case
+		 * or until other side disconnects.
+		 */
+		ret =
+		wait_event_interruptible(ep->recvwq,
+					 SCIFEP_CONNECTED != ep->state ||
+					 scif_rb_count(&qp->inbound_q,
+						       curr_recv_len)
+					 >= curr_recv_len);
+		spin_lock(&ep->lock);
+		if (ret)
+			break;
+	}
+	if (len - remaining_len)
+		ret = len - remaining_len;
+	else if (!ret && ep->state != SCIFEP_CONNECTED)
+		ret = ep->state == SCIFEP_DISCONNECTED ?
+			-ECONNRESET : -ENOTCONN;
+	spin_unlock(&ep->lock);
+	return ret;
+}
+
+/**
+ * scif_user_send() - Send data to connection queue
+ * @epd: The end point returned from scif_open()
+ * @msg: Address to place data
+ * @len: Length to receive
+ * @flags: blocking or non blocking
+ *
+ * This function is called from the driver IOCTL entry point
+ * only and is a wrapper for _scif_send().
+ */
+int scif_user_send(scif_epd_t epd, void __user *msg, int len, int flags)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	int err = 0;
+	int sent_len = 0;
+	char *tmp;
+	int loop_len;
+	int chunk_len = min(len, (1 << (MAX_ORDER + PAGE_SHIFT - 1)));
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI send (U): ep %p %s\n", ep, scif_ep_states[ep->state]);
+	if (!len)
+		return 0;
+
+	err = scif_msg_param_check(epd, len, flags);
+	if (err)
+		goto send_err;
+
+	tmp = kmalloc(chunk_len, GFP_KERNEL);
+	if (!tmp) {
+		err = -ENOMEM;
+		goto send_err;
+	}
+	/*
+	 * Grabbing the lock before breaking up the transfer in
+	 * multiple chunks is required to ensure that messages do
+	 * not get fragmented and reordered.
+	 */
+	mutex_lock(&ep->sendlock);
+	while (sent_len != len) {
+		loop_len = len - sent_len;
+		loop_len = min(chunk_len, loop_len);
+		if (copy_from_user(tmp, msg, loop_len)) {
+			err = -EFAULT;
+			goto send_free_err;
+		}
+		err = _scif_send(epd, tmp, loop_len, flags);
+		if (err < 0)
+			goto send_free_err;
+		sent_len += err;
+		msg += err;
+		if (err != loop_len)
+			goto send_free_err;
+	}
+send_free_err:
+	mutex_unlock(&ep->sendlock);
+	kfree(tmp);
+send_err:
+	return err < 0 ? err : sent_len;
+}
+
+/**
+ * scif_user_recv() - Receive data from connection queue
+ * @epd: The end point returned from scif_open()
+ * @msg: Address to place data
+ * @len: Length to receive
+ * @flags: blocking or non blocking
+ *
+ * This function is called from the driver IOCTL entry point
+ * only and is a wrapper for _scif_recv().
+ */
+int scif_user_recv(scif_epd_t epd, void __user *msg, int len, int flags)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	int err = 0;
+	int recv_len = 0;
+	char *tmp;
+	int loop_len;
+	int chunk_len = min(len, (1 << (MAX_ORDER + PAGE_SHIFT - 1)));
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI recv (U): ep %p %s\n", ep, scif_ep_states[ep->state]);
+	if (!len)
+		return 0;
+
+	err = scif_msg_param_check(epd, len, flags);
+	if (err)
+		goto recv_err;
+
+	tmp = kmalloc(chunk_len, GFP_KERNEL);
+	if (!tmp) {
+		err = -ENOMEM;
+		goto recv_err;
+	}
+	/*
+	 * Grabbing the lock before breaking up the transfer in
+	 * multiple chunks is required to ensure that messages do
+	 * not get fragmented and reordered.
+	 */
+	mutex_lock(&ep->recvlock);
+	while (recv_len != len) {
+		loop_len = len - recv_len;
+		loop_len = min(chunk_len, loop_len);
+		err = _scif_recv(epd, tmp, loop_len, flags);
+		if (err < 0)
+			goto recv_free_err;
+		if (copy_to_user(msg, tmp, err)) {
+			err = -EFAULT;
+			goto recv_free_err;
+		}
+		recv_len += err;
+		msg += err;
+		if (err != loop_len)
+			goto recv_free_err;
+	}
+recv_free_err:
+	mutex_unlock(&ep->recvlock);
+	kfree(tmp);
+recv_err:
+	return err < 0 ? err : recv_len;
+}
+
+/**
+ * scif_send() - Send data to connection queue
+ * @epd: The end point returned from scif_open()
+ * @msg: Address to place data
+ * @len: Length to receive
+ * @flags: blocking or non blocking
+ *
+ * This function is called from the kernel mode only and is
+ * a wrapper for _scif_send().
+ */
+int scif_send(scif_epd_t epd, void *msg, int len, int flags)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	int ret;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI send (K): ep %p %s\n", ep, scif_ep_states[ep->state]);
+	if (!len)
+		return 0;
+
+	ret = scif_msg_param_check(epd, len, flags);
+	if (ret)
+		return ret;
+	if (!ep->remote_dev)
+		return -ENOTCONN;
+	/*
+	 * Grab the mutex lock in the blocking case only
+	 * to ensure messages do not get fragmented/reordered.
+	 * The non blocking mode is protected using spin locks
+	 * in _scif_send().
+	 */
+	if (flags & SCIF_SEND_BLOCK)
+		mutex_lock(&ep->sendlock);
+
+	ret = _scif_send(epd, msg, len, flags);
+
+	if (flags & SCIF_SEND_BLOCK)
+		mutex_unlock(&ep->sendlock);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(scif_send);
+
+/**
+ * scif_recv() - Receive data from connection queue
+ * @epd: The end point returned from scif_open()
+ * @msg: Address to place data
+ * @len: Length to receive
+ * @flags: blocking or non blocking
+ *
+ * This function is called from the kernel mode only and is
+ * a wrapper for _scif_recv().
+ */
+int scif_recv(scif_epd_t epd, void *msg, int len, int flags)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	int ret;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI recv (K): ep %p %s\n", ep, scif_ep_states[ep->state]);
+	if (!len)
+		return 0;
+
+	ret = scif_msg_param_check(epd, len, flags);
+	if (ret)
+		return ret;
+	/*
+	 * Grab the mutex lock in the blocking case only
+	 * to ensure messages do not get fragmented/reordered.
+	 * The non blocking mode is protected using spin locks
+	 * in _scif_send().
+	 */
+	if (flags & SCIF_RECV_BLOCK)
+		mutex_lock(&ep->recvlock);
+
+	ret = _scif_recv(epd, msg, len, flags);
+
+	if (flags & SCIF_RECV_BLOCK)
+		mutex_unlock(&ep->recvlock);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(scif_recv);
+
+static inline void _scif_poll_wait(struct file *f, wait_queue_head_t *wq,
+				   poll_table *p, struct scif_endpt *ep)
+{
+	/*
+	 * Because poll_wait makes a GFP_KERNEL allocation, give up the lock
+	 * and regrab it afterwards. Because the endpoint state might have
+	 * changed while the lock was given up, the state must be checked
+	 * again after re-acquiring the lock. The code in __scif_pollfd(..)
+	 * does this.
+	 */
+	spin_unlock(&ep->lock);
+	poll_wait(f, wq, p);
+	spin_lock(&ep->lock);
+}
+
+__poll_t
+__scif_pollfd(struct file *f, poll_table *wait, struct scif_endpt *ep)
+{
+	__poll_t mask = 0;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI pollfd: ep %p %s\n", ep, scif_ep_states[ep->state]);
+
+	spin_lock(&ep->lock);
+
+	/* Endpoint is waiting for a non-blocking connect to complete */
+	if (ep->conn_async_state == ASYNC_CONN_INPROGRESS) {
+		_scif_poll_wait(f, &ep->conn_pend_wq, wait, ep);
+		if (ep->conn_async_state == ASYNC_CONN_INPROGRESS) {
+			if (ep->state == SCIFEP_CONNECTED ||
+			    ep->state == SCIFEP_DISCONNECTED ||
+			    ep->conn_err)
+				mask |= EPOLLOUT;
+			goto exit;
+		}
+	}
+
+	/* Endpoint is listening for incoming connection requests */
+	if (ep->state == SCIFEP_LISTENING) {
+		_scif_poll_wait(f, &ep->conwq, wait, ep);
+		if (ep->state == SCIFEP_LISTENING) {
+			if (ep->conreqcnt)
+				mask |= EPOLLIN;
+			goto exit;
+		}
+	}
+
+	/* Endpoint is connected or disconnected */
+	if (ep->state == SCIFEP_CONNECTED || ep->state == SCIFEP_DISCONNECTED) {
+		if (poll_requested_events(wait) & EPOLLIN)
+			_scif_poll_wait(f, &ep->recvwq, wait, ep);
+		if (poll_requested_events(wait) & EPOLLOUT)
+			_scif_poll_wait(f, &ep->sendwq, wait, ep);
+		if (ep->state == SCIFEP_CONNECTED ||
+		    ep->state == SCIFEP_DISCONNECTED) {
+			/* Data can be read without blocking */
+			if (scif_rb_count(&ep->qp_info.qp->inbound_q, 1))
+				mask |= EPOLLIN;
+			/* Data can be written without blocking */
+			if (scif_rb_space(&ep->qp_info.qp->outbound_q))
+				mask |= EPOLLOUT;
+			/* Return EPOLLHUP if endpoint is disconnected */
+			if (ep->state == SCIFEP_DISCONNECTED)
+				mask |= EPOLLHUP;
+			goto exit;
+		}
+	}
+
+	/* Return EPOLLERR if the endpoint is in none of the above states */
+	mask |= EPOLLERR;
+exit:
+	spin_unlock(&ep->lock);
+	return mask;
+}
+
+/**
+ * scif_poll() - Kernel mode SCIF poll
+ * @ufds: Array of scif_pollepd structures containing the end points
+ *	  and events to poll on
+ * @nfds: Size of the ufds array
+ * @timeout_msecs: Timeout in msecs, -ve implies infinite timeout
+ *
+ * The code flow in this function is based on do_poll(..) in select.c
+ *
+ * Returns the number of endpoints which have pending events or 0 in
+ * the event of a timeout. If a signal is used for wake up, -EINTR is
+ * returned.
+ */
+int
+scif_poll(struct scif_pollepd *ufds, unsigned int nfds, long timeout_msecs)
+{
+	struct poll_wqueues table;
+	poll_table *pt;
+	int i, count = 0, timed_out = timeout_msecs == 0;
+	__poll_t mask;
+	u64 timeout = timeout_msecs < 0 ? MAX_SCHEDULE_TIMEOUT
+		: msecs_to_jiffies(timeout_msecs);
+
+	poll_initwait(&table);
+	pt = &table.pt;
+	while (1) {
+		for (i = 0; i < nfds; i++) {
+			pt->_key = ufds[i].events | EPOLLERR | EPOLLHUP;
+			mask = __scif_pollfd(ufds[i].epd->anon,
+					     pt, ufds[i].epd);
+			mask &= ufds[i].events | EPOLLERR | EPOLLHUP;
+			if (mask) {
+				count++;
+				pt->_qproc = NULL;
+			}
+			ufds[i].revents = mask;
+		}
+		pt->_qproc = NULL;
+		if (!count) {
+			count = table.error;
+			if (signal_pending(current))
+				count = -EINTR;
+		}
+		if (count || timed_out)
+			break;
+
+		if (!schedule_timeout_interruptible(timeout))
+			timed_out = 1;
+	}
+	poll_freewait(&table);
+	return count;
+}
+EXPORT_SYMBOL_GPL(scif_poll);
+
+int scif_get_node_ids(u16 *nodes, int len, u16 *self)
+{
+	int online = 0;
+	int offset = 0;
+	int node;
+
+	if (!scif_is_mgmt_node())
+		scif_get_node_info();
+
+	*self = scif_info.nodeid;
+	mutex_lock(&scif_info.conflock);
+	len = min_t(int, len, scif_info.total);
+	for (node = 0; node <= scif_info.maxid; node++) {
+		if (_scifdev_alive(&scif_dev[node])) {
+			online++;
+			if (offset < len)
+				nodes[offset++] = node;
+		}
+	}
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI get_node_ids total %d online %d filled in %d nodes\n",
+		scif_info.total, online, offset);
+	mutex_unlock(&scif_info.conflock);
+
+	return online;
+}
+EXPORT_SYMBOL_GPL(scif_get_node_ids);
+
+static int scif_add_client_dev(struct device *dev, struct subsys_interface *si)
+{
+	struct scif_client *client =
+		container_of(si, struct scif_client, si);
+	struct scif_peer_dev *spdev =
+		container_of(dev, struct scif_peer_dev, dev);
+
+	if (client->probe)
+		client->probe(spdev);
+	return 0;
+}
+
+static void scif_remove_client_dev(struct device *dev,
+				   struct subsys_interface *si)
+{
+	struct scif_client *client =
+		container_of(si, struct scif_client, si);
+	struct scif_peer_dev *spdev =
+		container_of(dev, struct scif_peer_dev, dev);
+
+	if (client->remove)
+		client->remove(spdev);
+}
+
+void scif_client_unregister(struct scif_client *client)
+{
+	subsys_interface_unregister(&client->si);
+}
+EXPORT_SYMBOL_GPL(scif_client_unregister);
+
+int scif_client_register(struct scif_client *client)
+{
+	struct subsys_interface *si = &client->si;
+
+	si->name = client->name;
+	si->subsys = &scif_peer_bus;
+	si->add_dev = scif_add_client_dev;
+	si->remove_dev = scif_remove_client_dev;
+
+	return subsys_interface_register(&client->si);
+}
+EXPORT_SYMBOL_GPL(scif_client_register);
diff --git a/drivers/misc/mic/scif/scif_debugfs.c b/drivers/misc/mic/scif/scif_debugfs.c
new file mode 100644
index 000000000..6884dad97
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_debugfs.c
@@ -0,0 +1,162 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#include "../common/mic_dev.h"
+#include "scif_main.h"
+
+/* Debugfs parent dir */
+static struct dentry *scif_dbg;
+
+static int scif_dev_test(struct seq_file *s, void *unused)
+{
+	int node;
+
+	seq_printf(s, "Total Nodes %d Self Node Id %d Maxid %d\n",
+		   scif_info.total, scif_info.nodeid,
+		   scif_info.maxid);
+
+	if (!scif_dev)
+		return 0;
+
+	seq_printf(s, "%-16s\t%-16s\n", "node_id", "state");
+
+	for (node = 0; node <= scif_info.maxid; node++)
+		seq_printf(s, "%-16d\t%-16s\n", scif_dev[node].node,
+			   _scifdev_alive(&scif_dev[node]) ?
+			   "Running" : "Offline");
+	return 0;
+}
+
+static int scif_dev_test_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, scif_dev_test, inode->i_private);
+}
+
+static int scif_dev_test_release(struct inode *inode, struct file *file)
+{
+	return single_release(inode, file);
+}
+
+static const struct file_operations scif_dev_ops = {
+	.owner   = THIS_MODULE,
+	.open    = scif_dev_test_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = scif_dev_test_release
+};
+
+static void scif_display_window(struct scif_window *window, struct seq_file *s)
+{
+	int j;
+	struct scatterlist *sg;
+	scif_pinned_pages_t pin = window->pinned_pages;
+
+	seq_printf(s, "window %p type %d temp %d offset 0x%llx ",
+		   window, window->type, window->temp, window->offset);
+	seq_printf(s, "nr_pages 0x%llx nr_contig_chunks 0x%x prot %d ",
+		   window->nr_pages, window->nr_contig_chunks, window->prot);
+	seq_printf(s, "ref_count %d magic 0x%llx peer_window 0x%llx ",
+		   window->ref_count, window->magic, window->peer_window);
+	seq_printf(s, "unreg_state 0x%x va_for_temp 0x%lx\n",
+		   window->unreg_state, window->va_for_temp);
+
+	for (j = 0; j < window->nr_contig_chunks; j++)
+		seq_printf(s, "page[%d] dma_addr 0x%llx num_pages 0x%llx\n", j,
+			   window->dma_addr[j], window->num_pages[j]);
+
+	if (window->type == SCIF_WINDOW_SELF && pin)
+		for (j = 0; j < window->nr_pages; j++)
+			seq_printf(s, "page[%d] = pinned_pages %p address %p\n",
+				   j, pin->pages[j],
+				   page_address(pin->pages[j]));
+
+	if (window->st)
+		for_each_sg(window->st->sgl, sg, window->st->nents, j)
+			seq_printf(s, "sg[%d] dma addr 0x%llx length 0x%x\n",
+				   j, sg_dma_address(sg), sg_dma_len(sg));
+}
+
+static void scif_display_all_windows(struct list_head *head, struct seq_file *s)
+{
+	struct list_head *item;
+	struct scif_window *window;
+
+	list_for_each(item, head) {
+		window = list_entry(item, struct scif_window, list);
+		scif_display_window(window, s);
+	}
+}
+
+static int scif_rma_test(struct seq_file *s, void *unused)
+{
+	struct scif_endpt *ep;
+	struct list_head *pos;
+
+	mutex_lock(&scif_info.connlock);
+	list_for_each(pos, &scif_info.connected) {
+		ep = list_entry(pos, struct scif_endpt, list);
+		seq_printf(s, "ep %p self windows\n", ep);
+		mutex_lock(&ep->rma_info.rma_lock);
+		scif_display_all_windows(&ep->rma_info.reg_list, s);
+		seq_printf(s, "ep %p remote windows\n", ep);
+		scif_display_all_windows(&ep->rma_info.remote_reg_list, s);
+		mutex_unlock(&ep->rma_info.rma_lock);
+	}
+	mutex_unlock(&scif_info.connlock);
+	return 0;
+}
+
+static int scif_rma_test_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, scif_rma_test, inode->i_private);
+}
+
+static int scif_rma_test_release(struct inode *inode, struct file *file)
+{
+	return single_release(inode, file);
+}
+
+static const struct file_operations scif_rma_ops = {
+	.owner   = THIS_MODULE,
+	.open    = scif_rma_test_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = scif_rma_test_release
+};
+
+void __init scif_init_debugfs(void)
+{
+	scif_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
+	if (!scif_dbg) {
+		dev_err(scif_info.mdev.this_device,
+			"can't create debugfs dir scif\n");
+		return;
+	}
+
+	debugfs_create_file("scif_dev", 0444, scif_dbg, NULL, &scif_dev_ops);
+	debugfs_create_file("scif_rma", 0444, scif_dbg, NULL, &scif_rma_ops);
+	debugfs_create_u8("en_msg_log", 0666, scif_dbg, &scif_info.en_msg_log);
+	debugfs_create_u8("p2p_enable", 0666, scif_dbg, &scif_info.p2p_enable);
+}
+
+void scif_exit_debugfs(void)
+{
+	debugfs_remove_recursive(scif_dbg);
+}
diff --git a/drivers/misc/mic/scif/scif_dma.c b/drivers/misc/mic/scif/scif_dma.c
new file mode 100644
index 000000000..6369aeaa7
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_dma.c
@@ -0,0 +1,1960 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include "scif_main.h"
+#include "scif_map.h"
+
+/*
+ * struct scif_dma_comp_cb - SCIF DMA completion callback
+ *
+ * @dma_completion_func: DMA completion callback
+ * @cb_cookie: DMA completion callback cookie
+ * @temp_buf: Temporary buffer
+ * @temp_buf_to_free: Temporary buffer to be freed
+ * @is_cache: Is a kmem_cache allocated buffer
+ * @dst_offset: Destination registration offset
+ * @dst_window: Destination registration window
+ * @len: Length of the temp buffer
+ * @temp_phys: DMA address of the temp buffer
+ * @sdev: The SCIF device
+ * @header_padding: padding for cache line alignment
+ */
+struct scif_dma_comp_cb {
+	void (*dma_completion_func)(void *cookie);
+	void *cb_cookie;
+	u8 *temp_buf;
+	u8 *temp_buf_to_free;
+	bool is_cache;
+	s64 dst_offset;
+	struct scif_window *dst_window;
+	size_t len;
+	dma_addr_t temp_phys;
+	struct scif_dev *sdev;
+	int header_padding;
+};
+
+/**
+ * struct scif_copy_work - Work for DMA copy
+ *
+ * @src_offset: Starting source offset
+ * @dst_offset: Starting destination offset
+ * @src_window: Starting src registered window
+ * @dst_window: Starting dst registered window
+ * @loopback: true if this is a loopback DMA transfer
+ * @len: Length of the transfer
+ * @comp_cb: DMA copy completion callback
+ * @remote_dev: The remote SCIF peer device
+ * @fence_type: polling or interrupt based
+ * @ordered: is this a tail byte ordered DMA transfer
+ */
+struct scif_copy_work {
+	s64 src_offset;
+	s64 dst_offset;
+	struct scif_window *src_window;
+	struct scif_window *dst_window;
+	int loopback;
+	size_t len;
+	struct scif_dma_comp_cb   *comp_cb;
+	struct scif_dev	*remote_dev;
+	int fence_type;
+	bool ordered;
+};
+
+/**
+ * scif_reserve_dma_chan:
+ * @ep: Endpoint Descriptor.
+ *
+ * This routine reserves a DMA channel for a particular
+ * endpoint. All DMA transfers for an endpoint are always
+ * programmed on the same DMA channel.
+ */
+int scif_reserve_dma_chan(struct scif_endpt *ep)
+{
+	int err = 0;
+	struct scif_dev *scifdev;
+	struct scif_hw_dev *sdev;
+	struct dma_chan *chan;
+
+	/* Loopback DMAs are not supported on the management node */
+	if (!scif_info.nodeid && scifdev_self(ep->remote_dev))
+		return 0;
+	if (scif_info.nodeid)
+		scifdev = &scif_dev[0];
+	else
+		scifdev = ep->remote_dev;
+	sdev = scifdev->sdev;
+	if (!sdev->num_dma_ch)
+		return -ENODEV;
+	chan = sdev->dma_ch[scifdev->dma_ch_idx];
+	scifdev->dma_ch_idx = (scifdev->dma_ch_idx + 1) % sdev->num_dma_ch;
+	mutex_lock(&ep->rma_info.rma_lock);
+	ep->rma_info.dma_chan = chan;
+	mutex_unlock(&ep->rma_info.rma_lock);
+	return err;
+}
+
+#ifdef CONFIG_MMU_NOTIFIER
+/**
+ * scif_rma_destroy_tcw:
+ *
+ * This routine destroys temporary cached windows
+ */
+static
+void __scif_rma_destroy_tcw(struct scif_mmu_notif *mmn,
+			    u64 start, u64 len)
+{
+	struct list_head *item, *tmp;
+	struct scif_window *window;
+	u64 start_va, end_va;
+	u64 end = start + len;
+
+	if (end <= start)
+		return;
+
+	list_for_each_safe(item, tmp, &mmn->tc_reg_list) {
+		window = list_entry(item, struct scif_window, list);
+		if (!len)
+			break;
+		start_va = window->va_for_temp;
+		end_va = start_va + (window->nr_pages << PAGE_SHIFT);
+		if (start < start_va && end <= start_va)
+			break;
+		if (start >= end_va)
+			continue;
+		__scif_rma_destroy_tcw_helper(window);
+	}
+}
+
+static void scif_rma_destroy_tcw(struct scif_mmu_notif *mmn, u64 start, u64 len)
+{
+	struct scif_endpt *ep = mmn->ep;
+
+	spin_lock(&ep->rma_info.tc_lock);
+	__scif_rma_destroy_tcw(mmn, start, len);
+	spin_unlock(&ep->rma_info.tc_lock);
+}
+
+static void scif_rma_destroy_tcw_ep(struct scif_endpt *ep)
+{
+	struct list_head *item, *tmp;
+	struct scif_mmu_notif *mmn;
+
+	list_for_each_safe(item, tmp, &ep->rma_info.mmn_list) {
+		mmn = list_entry(item, struct scif_mmu_notif, list);
+		scif_rma_destroy_tcw(mmn, 0, ULONG_MAX);
+	}
+}
+
+static void __scif_rma_destroy_tcw_ep(struct scif_endpt *ep)
+{
+	struct list_head *item, *tmp;
+	struct scif_mmu_notif *mmn;
+
+	spin_lock(&ep->rma_info.tc_lock);
+	list_for_each_safe(item, tmp, &ep->rma_info.mmn_list) {
+		mmn = list_entry(item, struct scif_mmu_notif, list);
+		__scif_rma_destroy_tcw(mmn, 0, ULONG_MAX);
+	}
+	spin_unlock(&ep->rma_info.tc_lock);
+}
+
+static bool scif_rma_tc_can_cache(struct scif_endpt *ep, size_t cur_bytes)
+{
+	if ((cur_bytes >> PAGE_SHIFT) > scif_info.rma_tc_limit)
+		return false;
+	if ((atomic_read(&ep->rma_info.tcw_total_pages)
+			+ (cur_bytes >> PAGE_SHIFT)) >
+			scif_info.rma_tc_limit) {
+		dev_info(scif_info.mdev.this_device,
+			 "%s %d total=%d, current=%zu reached max\n",
+			 __func__, __LINE__,
+			 atomic_read(&ep->rma_info.tcw_total_pages),
+			 (1 + (cur_bytes >> PAGE_SHIFT)));
+		scif_rma_destroy_tcw_invalid();
+		__scif_rma_destroy_tcw_ep(ep);
+	}
+	return true;
+}
+
+static void scif_mmu_notifier_release(struct mmu_notifier *mn,
+				      struct mm_struct *mm)
+{
+	struct scif_mmu_notif	*mmn;
+
+	mmn = container_of(mn, struct scif_mmu_notif, ep_mmu_notifier);
+	scif_rma_destroy_tcw(mmn, 0, ULONG_MAX);
+	schedule_work(&scif_info.misc_work);
+}
+
+static int scif_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
+						     struct mm_struct *mm,
+						     unsigned long start,
+						     unsigned long end,
+						     bool blockable)
+{
+	struct scif_mmu_notif	*mmn;
+
+	mmn = container_of(mn, struct scif_mmu_notif, ep_mmu_notifier);
+	scif_rma_destroy_tcw(mmn, start, end - start);
+
+	return 0;
+}
+
+static void scif_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
+						   struct mm_struct *mm,
+						   unsigned long start,
+						   unsigned long end)
+{
+	/*
+	 * Nothing to do here, everything needed was done in
+	 * invalidate_range_start.
+	 */
+}
+
+static const struct mmu_notifier_ops scif_mmu_notifier_ops = {
+	.release = scif_mmu_notifier_release,
+	.clear_flush_young = NULL,
+	.invalidate_range_start = scif_mmu_notifier_invalidate_range_start,
+	.invalidate_range_end = scif_mmu_notifier_invalidate_range_end};
+
+static void scif_ep_unregister_mmu_notifier(struct scif_endpt *ep)
+{
+	struct scif_endpt_rma_info *rma = &ep->rma_info;
+	struct scif_mmu_notif *mmn = NULL;
+	struct list_head *item, *tmp;
+
+	mutex_lock(&ep->rma_info.mmn_lock);
+	list_for_each_safe(item, tmp, &rma->mmn_list) {
+		mmn = list_entry(item, struct scif_mmu_notif, list);
+		mmu_notifier_unregister(&mmn->ep_mmu_notifier, mmn->mm);
+		list_del(item);
+		kfree(mmn);
+	}
+	mutex_unlock(&ep->rma_info.mmn_lock);
+}
+
+static void scif_init_mmu_notifier(struct scif_mmu_notif *mmn,
+				   struct mm_struct *mm, struct scif_endpt *ep)
+{
+	mmn->ep = ep;
+	mmn->mm = mm;
+	mmn->ep_mmu_notifier.ops = &scif_mmu_notifier_ops;
+	INIT_LIST_HEAD(&mmn->list);
+	INIT_LIST_HEAD(&mmn->tc_reg_list);
+}
+
+static struct scif_mmu_notif *
+scif_find_mmu_notifier(struct mm_struct *mm, struct scif_endpt_rma_info *rma)
+{
+	struct scif_mmu_notif *mmn;
+
+	list_for_each_entry(mmn, &rma->mmn_list, list)
+		if (mmn->mm == mm)
+			return mmn;
+	return NULL;
+}
+
+static struct scif_mmu_notif *
+scif_add_mmu_notifier(struct mm_struct *mm, struct scif_endpt *ep)
+{
+	struct scif_mmu_notif *mmn
+		 = kzalloc(sizeof(*mmn), GFP_KERNEL);
+
+	if (!mmn)
+		return ERR_PTR(-ENOMEM);
+
+	scif_init_mmu_notifier(mmn, current->mm, ep);
+	if (mmu_notifier_register(&mmn->ep_mmu_notifier, current->mm)) {
+		kfree(mmn);
+		return ERR_PTR(-EBUSY);
+	}
+	list_add(&mmn->list, &ep->rma_info.mmn_list);
+	return mmn;
+}
+
+/*
+ * Called from the misc thread to destroy temporary cached windows and
+ * unregister the MMU notifier for the SCIF endpoint.
+ */
+void scif_mmu_notif_handler(struct work_struct *work)
+{
+	struct list_head *pos, *tmpq;
+	struct scif_endpt *ep;
+restart:
+	scif_rma_destroy_tcw_invalid();
+	spin_lock(&scif_info.rmalock);
+	list_for_each_safe(pos, tmpq, &scif_info.mmu_notif_cleanup) {
+		ep = list_entry(pos, struct scif_endpt, mmu_list);
+		list_del(&ep->mmu_list);
+		spin_unlock(&scif_info.rmalock);
+		scif_rma_destroy_tcw_ep(ep);
+		scif_ep_unregister_mmu_notifier(ep);
+		goto restart;
+	}
+	spin_unlock(&scif_info.rmalock);
+}
+
+static bool scif_is_set_reg_cache(int flags)
+{
+	return !!(flags & SCIF_RMA_USECACHE);
+}
+#else
+static struct scif_mmu_notif *
+scif_find_mmu_notifier(struct mm_struct *mm,
+		       struct scif_endpt_rma_info *rma)
+{
+	return NULL;
+}
+
+static struct scif_mmu_notif *
+scif_add_mmu_notifier(struct mm_struct *mm, struct scif_endpt *ep)
+{
+	return NULL;
+}
+
+void scif_mmu_notif_handler(struct work_struct *work)
+{
+}
+
+static bool scif_is_set_reg_cache(int flags)
+{
+	return false;
+}
+
+static bool scif_rma_tc_can_cache(struct scif_endpt *ep, size_t cur_bytes)
+{
+	return false;
+}
+#endif
+
+/**
+ * scif_register_temp:
+ * @epd: End Point Descriptor.
+ * @addr: virtual address to/from which to copy
+ * @len: length of range to copy
+ * @out_offset: computed offset returned by reference.
+ * @out_window: allocated registered window returned by reference.
+ *
+ * Create a temporary registered window. The peer will not know about this
+ * window. This API is used for scif_vreadfrom()/scif_vwriteto() API's.
+ */
+static int
+scif_register_temp(scif_epd_t epd, unsigned long addr, size_t len, int prot,
+		   off_t *out_offset, struct scif_window **out_window)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	int err;
+	scif_pinned_pages_t pinned_pages;
+	size_t aligned_len;
+
+	aligned_len = ALIGN(len, PAGE_SIZE);
+
+	err = __scif_pin_pages((void *)(addr & PAGE_MASK),
+			       aligned_len, &prot, 0, &pinned_pages);
+	if (err)
+		return err;
+
+	pinned_pages->prot = prot;
+
+	/* Compute the offset for this registration */
+	err = scif_get_window_offset(ep, 0, 0,
+				     aligned_len >> PAGE_SHIFT,
+				     (s64 *)out_offset);
+	if (err)
+		goto error_unpin;
+
+	/* Allocate and prepare self registration window */
+	*out_window = scif_create_window(ep, aligned_len >> PAGE_SHIFT,
+					*out_offset, true);
+	if (!*out_window) {
+		scif_free_window_offset(ep, NULL, *out_offset);
+		err = -ENOMEM;
+		goto error_unpin;
+	}
+
+	(*out_window)->pinned_pages = pinned_pages;
+	(*out_window)->nr_pages = pinned_pages->nr_pages;
+	(*out_window)->prot = pinned_pages->prot;
+
+	(*out_window)->va_for_temp = addr & PAGE_MASK;
+	err = scif_map_window(ep->remote_dev, *out_window);
+	if (err) {
+		/* Something went wrong! Rollback */
+		scif_destroy_window(ep, *out_window);
+		*out_window = NULL;
+	} else {
+		*out_offset |= (addr - (*out_window)->va_for_temp);
+	}
+	return err;
+error_unpin:
+	if (err)
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %d\n", __func__, __LINE__, err);
+	scif_unpin_pages(pinned_pages);
+	return err;
+}
+
+#define SCIF_DMA_TO (3 * HZ)
+
+/*
+ * scif_sync_dma - Program a DMA without an interrupt descriptor
+ *
+ * @dev - The address of the pointer to the device instance used
+ * for DMA registration.
+ * @chan - DMA channel to be used.
+ * @sync_wait: Wait for DMA to complete?
+ *
+ * Return 0 on success and -errno on error.
+ */
+static int scif_sync_dma(struct scif_hw_dev *sdev, struct dma_chan *chan,
+			 bool sync_wait)
+{
+	int err = 0;
+	struct dma_async_tx_descriptor *tx = NULL;
+	enum dma_ctrl_flags flags = DMA_PREP_FENCE;
+	dma_cookie_t cookie;
+	struct dma_device *ddev;
+
+	if (!chan) {
+		err = -EIO;
+		dev_err(&sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		return err;
+	}
+	ddev = chan->device;
+
+	tx = ddev->device_prep_dma_memcpy(chan, 0, 0, 0, flags);
+	if (!tx) {
+		err = -ENOMEM;
+		dev_err(&sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		goto release;
+	}
+	cookie = tx->tx_submit(tx);
+
+	if (dma_submit_error(cookie)) {
+		err = -ENOMEM;
+		dev_err(&sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		goto release;
+	}
+	if (!sync_wait) {
+		dma_async_issue_pending(chan);
+	} else {
+		if (dma_sync_wait(chan, cookie) == DMA_COMPLETE) {
+			err = 0;
+		} else {
+			err = -EIO;
+			dev_err(&sdev->dev, "%s %d err %d\n",
+				__func__, __LINE__, err);
+		}
+	}
+release:
+	return err;
+}
+
+static void scif_dma_callback(void *arg)
+{
+	struct completion *done = (struct completion *)arg;
+
+	complete(done);
+}
+
+#define SCIF_DMA_SYNC_WAIT true
+#define SCIF_DMA_POLL BIT(0)
+#define SCIF_DMA_INTR BIT(1)
+
+/*
+ * scif_async_dma - Program a DMA with an interrupt descriptor
+ *
+ * @dev - The address of the pointer to the device instance used
+ * for DMA registration.
+ * @chan - DMA channel to be used.
+ * Return 0 on success and -errno on error.
+ */
+static int scif_async_dma(struct scif_hw_dev *sdev, struct dma_chan *chan)
+{
+	int err = 0;
+	struct dma_device *ddev;
+	struct dma_async_tx_descriptor *tx = NULL;
+	enum dma_ctrl_flags flags = DMA_PREP_INTERRUPT | DMA_PREP_FENCE;
+	DECLARE_COMPLETION_ONSTACK(done_wait);
+	dma_cookie_t cookie;
+	enum dma_status status;
+
+	if (!chan) {
+		err = -EIO;
+		dev_err(&sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		return err;
+	}
+	ddev = chan->device;
+
+	tx = ddev->device_prep_dma_memcpy(chan, 0, 0, 0, flags);
+	if (!tx) {
+		err = -ENOMEM;
+		dev_err(&sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		goto release;
+	}
+	reinit_completion(&done_wait);
+	tx->callback = scif_dma_callback;
+	tx->callback_param = &done_wait;
+	cookie = tx->tx_submit(tx);
+
+	if (dma_submit_error(cookie)) {
+		err = -ENOMEM;
+		dev_err(&sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		goto release;
+	}
+	dma_async_issue_pending(chan);
+
+	err = wait_for_completion_timeout(&done_wait, SCIF_DMA_TO);
+	if (!err) {
+		err = -EIO;
+		dev_err(&sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		goto release;
+	}
+	err = 0;
+	status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
+	if (status != DMA_COMPLETE) {
+		err = -EIO;
+		dev_err(&sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		goto release;
+	}
+release:
+	return err;
+}
+
+/*
+ * scif_drain_dma_poll - Drain all outstanding DMA operations for a particular
+ * DMA channel via polling.
+ *
+ * @sdev - The SCIF device
+ * @chan - DMA channel
+ * Return 0 on success and -errno on error.
+ */
+static int scif_drain_dma_poll(struct scif_hw_dev *sdev, struct dma_chan *chan)
+{
+	if (!chan)
+		return -EINVAL;
+	return scif_sync_dma(sdev, chan, SCIF_DMA_SYNC_WAIT);
+}
+
+/*
+ * scif_drain_dma_intr - Drain all outstanding DMA operations for a particular
+ * DMA channel via interrupt based blocking wait.
+ *
+ * @sdev - The SCIF device
+ * @chan - DMA channel
+ * Return 0 on success and -errno on error.
+ */
+int scif_drain_dma_intr(struct scif_hw_dev *sdev, struct dma_chan *chan)
+{
+	if (!chan)
+		return -EINVAL;
+	return scif_async_dma(sdev, chan);
+}
+
+/**
+ * scif_rma_destroy_windows:
+ *
+ * This routine destroys all windows queued for cleanup
+ */
+void scif_rma_destroy_windows(void)
+{
+	struct list_head *item, *tmp;
+	struct scif_window *window;
+	struct scif_endpt *ep;
+	struct dma_chan *chan;
+
+	might_sleep();
+restart:
+	spin_lock(&scif_info.rmalock);
+	list_for_each_safe(item, tmp, &scif_info.rma) {
+		window = list_entry(item, struct scif_window,
+				    list);
+		ep = (struct scif_endpt *)window->ep;
+		chan = ep->rma_info.dma_chan;
+
+		list_del_init(&window->list);
+		spin_unlock(&scif_info.rmalock);
+		if (!chan || !scifdev_alive(ep) ||
+		    !scif_drain_dma_intr(ep->remote_dev->sdev,
+					 ep->rma_info.dma_chan))
+			/* Remove window from global list */
+			window->unreg_state = OP_COMPLETED;
+		else
+			dev_warn(&ep->remote_dev->sdev->dev,
+				 "DMA engine hung?\n");
+		if (window->unreg_state == OP_COMPLETED) {
+			if (window->type == SCIF_WINDOW_SELF)
+				scif_destroy_window(ep, window);
+			else
+				scif_destroy_remote_window(window);
+			atomic_dec(&ep->rma_info.tw_refcount);
+		}
+		goto restart;
+	}
+	spin_unlock(&scif_info.rmalock);
+}
+
+/**
+ * scif_rma_destroy_tcw:
+ *
+ * This routine destroys temporary cached registered windows
+ * which have been queued for cleanup.
+ */
+void scif_rma_destroy_tcw_invalid(void)
+{
+	struct list_head *item, *tmp;
+	struct scif_window *window;
+	struct scif_endpt *ep;
+	struct dma_chan *chan;
+
+	might_sleep();
+restart:
+	spin_lock(&scif_info.rmalock);
+	list_for_each_safe(item, tmp, &scif_info.rma_tc) {
+		window = list_entry(item, struct scif_window, list);
+		ep = (struct scif_endpt *)window->ep;
+		chan = ep->rma_info.dma_chan;
+		list_del_init(&window->list);
+		spin_unlock(&scif_info.rmalock);
+		mutex_lock(&ep->rma_info.rma_lock);
+		if (!chan || !scifdev_alive(ep) ||
+		    !scif_drain_dma_intr(ep->remote_dev->sdev,
+					 ep->rma_info.dma_chan)) {
+			atomic_sub(window->nr_pages,
+				   &ep->rma_info.tcw_total_pages);
+			scif_destroy_window(ep, window);
+			atomic_dec(&ep->rma_info.tcw_refcount);
+		} else {
+			dev_warn(&ep->remote_dev->sdev->dev,
+				 "DMA engine hung?\n");
+		}
+		mutex_unlock(&ep->rma_info.rma_lock);
+		goto restart;
+	}
+	spin_unlock(&scif_info.rmalock);
+}
+
+static inline
+void *_get_local_va(off_t off, struct scif_window *window, size_t len)
+{
+	int page_nr = (off - window->offset) >> PAGE_SHIFT;
+	off_t page_off = off & ~PAGE_MASK;
+	void *va = NULL;
+
+	if (window->type == SCIF_WINDOW_SELF) {
+		struct page **pages = window->pinned_pages->pages;
+
+		va = page_address(pages[page_nr]) + page_off;
+	}
+	return va;
+}
+
+static inline
+void *ioremap_remote(off_t off, struct scif_window *window,
+		     size_t len, struct scif_dev *dev,
+		     struct scif_window_iter *iter)
+{
+	dma_addr_t phys = scif_off_to_dma_addr(window, off, NULL, iter);
+
+	/*
+	 * If the DMA address is not card relative then we need the DMA
+	 * addresses to be an offset into the bar. The aperture base was already
+	 * added so subtract it here since scif_ioremap is going to add it again
+	 */
+	if (!scifdev_self(dev) && window->type == SCIF_WINDOW_PEER &&
+	    dev->sdev->aper && !dev->sdev->card_rel_da)
+		phys = phys - dev->sdev->aper->pa;
+	return scif_ioremap(phys, len, dev);
+}
+
+static inline void
+iounmap_remote(void *virt, size_t size, struct scif_copy_work *work)
+{
+	scif_iounmap(virt, size, work->remote_dev);
+}
+
+/*
+ * Takes care of ordering issue caused by
+ * 1. Hardware:  Only in the case of cpu copy from mgmt node to card
+ * because of WC memory.
+ * 2. Software: If memcpy reorders copy instructions for optimization.
+ * This could happen at both mgmt node and card.
+ */
+static inline void
+scif_ordered_memcpy_toio(char *dst, const char *src, size_t count)
+{
+	if (!count)
+		return;
+
+	memcpy_toio((void __iomem __force *)dst, src, --count);
+	/* Order the last byte with the previous stores */
+	wmb();
+	*(dst + count) = *(src + count);
+}
+
+static inline void scif_unaligned_cpy_toio(char *dst, const char *src,
+					   size_t count, bool ordered)
+{
+	if (ordered)
+		scif_ordered_memcpy_toio(dst, src, count);
+	else
+		memcpy_toio((void __iomem __force *)dst, src, count);
+}
+
+static inline
+void scif_ordered_memcpy_fromio(char *dst, const char *src, size_t count)
+{
+	if (!count)
+		return;
+
+	memcpy_fromio(dst, (void __iomem __force *)src, --count);
+	/* Order the last byte with the previous loads */
+	rmb();
+	*(dst + count) = *(src + count);
+}
+
+static inline void scif_unaligned_cpy_fromio(char *dst, const char *src,
+					     size_t count, bool ordered)
+{
+	if (ordered)
+		scif_ordered_memcpy_fromio(dst, src, count);
+	else
+		memcpy_fromio(dst, (void __iomem __force *)src, count);
+}
+
+#define SCIF_RMA_ERROR_CODE (~(dma_addr_t)0x0)
+
+/*
+ * scif_off_to_dma_addr:
+ * Obtain the dma_addr given the window and the offset.
+ * @window: Registered window.
+ * @off: Window offset.
+ * @nr_bytes: Return the number of contiguous bytes till next DMA addr index.
+ * @index: Return the index of the dma_addr array found.
+ * @start_off: start offset of index of the dma addr array found.
+ * The nr_bytes provides the callee an estimate of the maximum possible
+ * DMA xfer possible while the index/start_off provide faster lookups
+ * for the next iteration.
+ */
+dma_addr_t scif_off_to_dma_addr(struct scif_window *window, s64 off,
+				size_t *nr_bytes, struct scif_window_iter *iter)
+{
+	int i, page_nr;
+	s64 start, end;
+	off_t page_off;
+
+	if (window->nr_pages == window->nr_contig_chunks) {
+		page_nr = (off - window->offset) >> PAGE_SHIFT;
+		page_off = off & ~PAGE_MASK;
+
+		if (nr_bytes)
+			*nr_bytes = PAGE_SIZE - page_off;
+		return window->dma_addr[page_nr] | page_off;
+	}
+	if (iter) {
+		i = iter->index;
+		start = iter->offset;
+	} else {
+		i =  0;
+		start =  window->offset;
+	}
+	for (; i < window->nr_contig_chunks; i++) {
+		end = start + (window->num_pages[i] << PAGE_SHIFT);
+		if (off >= start && off < end) {
+			if (iter) {
+				iter->index = i;
+				iter->offset = start;
+			}
+			if (nr_bytes)
+				*nr_bytes = end - off;
+			return (window->dma_addr[i] + (off - start));
+		}
+		start += (window->num_pages[i] << PAGE_SHIFT);
+	}
+	dev_err(scif_info.mdev.this_device,
+		"%s %d BUG. Addr not found? window %p off 0x%llx\n",
+		__func__, __LINE__, window, off);
+	return SCIF_RMA_ERROR_CODE;
+}
+
+/*
+ * Copy between rma window and temporary buffer
+ */
+static void scif_rma_local_cpu_copy(s64 offset, struct scif_window *window,
+				    u8 *temp, size_t rem_len, bool to_temp)
+{
+	void *window_virt;
+	size_t loop_len;
+	int offset_in_page;
+	s64 end_offset;
+
+	offset_in_page = offset & ~PAGE_MASK;
+	loop_len = PAGE_SIZE - offset_in_page;
+
+	if (rem_len < loop_len)
+		loop_len = rem_len;
+
+	window_virt = _get_local_va(offset, window, loop_len);
+	if (!window_virt)
+		return;
+	if (to_temp)
+		memcpy(temp, window_virt, loop_len);
+	else
+		memcpy(window_virt, temp, loop_len);
+
+	offset += loop_len;
+	temp += loop_len;
+	rem_len -= loop_len;
+
+	end_offset = window->offset +
+		(window->nr_pages << PAGE_SHIFT);
+	while (rem_len) {
+		if (offset == end_offset) {
+			window = list_next_entry(window, list);
+			end_offset = window->offset +
+				(window->nr_pages << PAGE_SHIFT);
+		}
+		loop_len = min(PAGE_SIZE, rem_len);
+		window_virt = _get_local_va(offset, window, loop_len);
+		if (!window_virt)
+			return;
+		if (to_temp)
+			memcpy(temp, window_virt, loop_len);
+		else
+			memcpy(window_virt, temp, loop_len);
+		offset	+= loop_len;
+		temp	+= loop_len;
+		rem_len	-= loop_len;
+	}
+}
+
+/**
+ * scif_rma_completion_cb:
+ * @data: RMA cookie
+ *
+ * RMA interrupt completion callback.
+ */
+static void scif_rma_completion_cb(void *data)
+{
+	struct scif_dma_comp_cb *comp_cb = data;
+
+	/* Free DMA Completion CB. */
+	if (comp_cb->dst_window)
+		scif_rma_local_cpu_copy(comp_cb->dst_offset,
+					comp_cb->dst_window,
+					comp_cb->temp_buf +
+					comp_cb->header_padding,
+					comp_cb->len, false);
+	scif_unmap_single(comp_cb->temp_phys, comp_cb->sdev,
+			  SCIF_KMEM_UNALIGNED_BUF_SIZE);
+	if (comp_cb->is_cache)
+		kmem_cache_free(unaligned_cache,
+				comp_cb->temp_buf_to_free);
+	else
+		kfree(comp_cb->temp_buf_to_free);
+}
+
+/* Copies between temporary buffer and offsets provided in work */
+static int
+scif_rma_list_dma_copy_unaligned(struct scif_copy_work *work,
+				 u8 *temp, struct dma_chan *chan,
+				 bool src_local)
+{
+	struct scif_dma_comp_cb *comp_cb = work->comp_cb;
+	dma_addr_t window_dma_addr, temp_dma_addr;
+	dma_addr_t temp_phys = comp_cb->temp_phys;
+	size_t loop_len, nr_contig_bytes = 0, remaining_len = work->len;
+	int offset_in_ca, ret = 0;
+	s64 end_offset, offset;
+	struct scif_window *window;
+	void *window_virt_addr;
+	size_t tail_len;
+	struct dma_async_tx_descriptor *tx;
+	struct dma_device *dev = chan->device;
+	dma_cookie_t cookie;
+
+	if (src_local) {
+		offset = work->dst_offset;
+		window = work->dst_window;
+	} else {
+		offset = work->src_offset;
+		window = work->src_window;
+	}
+
+	offset_in_ca = offset & (L1_CACHE_BYTES - 1);
+	if (offset_in_ca) {
+		loop_len = L1_CACHE_BYTES - offset_in_ca;
+		loop_len = min(loop_len, remaining_len);
+		window_virt_addr = ioremap_remote(offset, window,
+						  loop_len,
+						  work->remote_dev,
+						  NULL);
+		if (!window_virt_addr)
+			return -ENOMEM;
+		if (src_local)
+			scif_unaligned_cpy_toio(window_virt_addr, temp,
+						loop_len,
+						work->ordered &&
+						!(remaining_len - loop_len));
+		else
+			scif_unaligned_cpy_fromio(temp, window_virt_addr,
+						  loop_len, work->ordered &&
+						  !(remaining_len - loop_len));
+		iounmap_remote(window_virt_addr, loop_len, work);
+
+		offset += loop_len;
+		temp += loop_len;
+		temp_phys += loop_len;
+		remaining_len -= loop_len;
+	}
+
+	offset_in_ca = offset & ~PAGE_MASK;
+	end_offset = window->offset +
+		(window->nr_pages << PAGE_SHIFT);
+
+	tail_len = remaining_len & (L1_CACHE_BYTES - 1);
+	remaining_len -= tail_len;
+	while (remaining_len) {
+		if (offset == end_offset) {
+			window = list_next_entry(window, list);
+			end_offset = window->offset +
+				(window->nr_pages << PAGE_SHIFT);
+		}
+		if (scif_is_mgmt_node())
+			temp_dma_addr = temp_phys;
+		else
+			/* Fix if we ever enable IOMMU on the card */
+			temp_dma_addr = (dma_addr_t)virt_to_phys(temp);
+		window_dma_addr = scif_off_to_dma_addr(window, offset,
+						       &nr_contig_bytes,
+						       NULL);
+		loop_len = min(nr_contig_bytes, remaining_len);
+		if (src_local) {
+			if (work->ordered && !tail_len &&
+			    !(remaining_len - loop_len) &&
+			    loop_len != L1_CACHE_BYTES) {
+				/*
+				 * Break up the last chunk of the transfer into
+				 * two steps. if there is no tail to guarantee
+				 * DMA ordering. SCIF_DMA_POLLING inserts
+				 * a status update descriptor in step 1 which
+				 * acts as a double sided synchronization fence
+				 * for the DMA engine to ensure that the last
+				 * cache line in step 2 is updated last.
+				 */
+				/* Step 1) DMA: Body Length - L1_CACHE_BYTES. */
+				tx =
+				dev->device_prep_dma_memcpy(chan,
+							    window_dma_addr,
+							    temp_dma_addr,
+							    loop_len -
+							    L1_CACHE_BYTES,
+							    DMA_PREP_FENCE);
+				if (!tx) {
+					ret = -ENOMEM;
+					goto err;
+				}
+				cookie = tx->tx_submit(tx);
+				if (dma_submit_error(cookie)) {
+					ret = -ENOMEM;
+					goto err;
+				}
+				dma_async_issue_pending(chan);
+				offset += (loop_len - L1_CACHE_BYTES);
+				temp_dma_addr += (loop_len - L1_CACHE_BYTES);
+				window_dma_addr += (loop_len - L1_CACHE_BYTES);
+				remaining_len -= (loop_len - L1_CACHE_BYTES);
+				loop_len = remaining_len;
+
+				/* Step 2) DMA: L1_CACHE_BYTES */
+				tx =
+				dev->device_prep_dma_memcpy(chan,
+							    window_dma_addr,
+							    temp_dma_addr,
+							    loop_len, 0);
+				if (!tx) {
+					ret = -ENOMEM;
+					goto err;
+				}
+				cookie = tx->tx_submit(tx);
+				if (dma_submit_error(cookie)) {
+					ret = -ENOMEM;
+					goto err;
+				}
+				dma_async_issue_pending(chan);
+			} else {
+				tx =
+				dev->device_prep_dma_memcpy(chan,
+							    window_dma_addr,
+							    temp_dma_addr,
+							    loop_len, 0);
+				if (!tx) {
+					ret = -ENOMEM;
+					goto err;
+				}
+				cookie = tx->tx_submit(tx);
+				if (dma_submit_error(cookie)) {
+					ret = -ENOMEM;
+					goto err;
+				}
+				dma_async_issue_pending(chan);
+			}
+		} else {
+			tx = dev->device_prep_dma_memcpy(chan, temp_dma_addr,
+					window_dma_addr, loop_len, 0);
+			if (!tx) {
+				ret = -ENOMEM;
+				goto err;
+			}
+			cookie = tx->tx_submit(tx);
+			if (dma_submit_error(cookie)) {
+				ret = -ENOMEM;
+				goto err;
+			}
+			dma_async_issue_pending(chan);
+		}
+		if (ret < 0)
+			goto err;
+		offset += loop_len;
+		temp += loop_len;
+		temp_phys += loop_len;
+		remaining_len -= loop_len;
+		offset_in_ca = 0;
+	}
+	if (tail_len) {
+		if (offset == end_offset) {
+			window = list_next_entry(window, list);
+			end_offset = window->offset +
+				(window->nr_pages << PAGE_SHIFT);
+		}
+		window_virt_addr = ioremap_remote(offset, window, tail_len,
+						  work->remote_dev,
+						  NULL);
+		if (!window_virt_addr)
+			return -ENOMEM;
+		/*
+		 * The CPU copy for the tail bytes must be initiated only once
+		 * previous DMA transfers for this endpoint have completed
+		 * to guarantee ordering.
+		 */
+		if (work->ordered) {
+			struct scif_dev *rdev = work->remote_dev;
+
+			ret = scif_drain_dma_intr(rdev->sdev, chan);
+			if (ret)
+				return ret;
+		}
+		if (src_local)
+			scif_unaligned_cpy_toio(window_virt_addr, temp,
+						tail_len, work->ordered);
+		else
+			scif_unaligned_cpy_fromio(temp, window_virt_addr,
+						  tail_len, work->ordered);
+		iounmap_remote(window_virt_addr, tail_len, work);
+	}
+	tx = dev->device_prep_dma_memcpy(chan, 0, 0, 0, DMA_PREP_INTERRUPT);
+	if (!tx) {
+		ret = -ENOMEM;
+		return ret;
+	}
+	tx->callback = &scif_rma_completion_cb;
+	tx->callback_param = comp_cb;
+	cookie = tx->tx_submit(tx);
+
+	if (dma_submit_error(cookie)) {
+		ret = -ENOMEM;
+		return ret;
+	}
+	dma_async_issue_pending(chan);
+	return 0;
+err:
+	dev_err(scif_info.mdev.this_device,
+		"%s %d Desc Prog Failed ret %d\n",
+		__func__, __LINE__, ret);
+	return ret;
+}
+
+/*
+ * _scif_rma_list_dma_copy_aligned:
+ *
+ * Traverse all the windows and perform DMA copy.
+ */
+static int _scif_rma_list_dma_copy_aligned(struct scif_copy_work *work,
+					   struct dma_chan *chan)
+{
+	dma_addr_t src_dma_addr, dst_dma_addr;
+	size_t loop_len, remaining_len, src_contig_bytes = 0;
+	size_t dst_contig_bytes = 0;
+	struct scif_window_iter src_win_iter;
+	struct scif_window_iter dst_win_iter;
+	s64 end_src_offset, end_dst_offset;
+	struct scif_window *src_window = work->src_window;
+	struct scif_window *dst_window = work->dst_window;
+	s64 src_offset = work->src_offset, dst_offset = work->dst_offset;
+	int ret = 0;
+	struct dma_async_tx_descriptor *tx;
+	struct dma_device *dev = chan->device;
+	dma_cookie_t cookie;
+
+	remaining_len = work->len;
+
+	scif_init_window_iter(src_window, &src_win_iter);
+	scif_init_window_iter(dst_window, &dst_win_iter);
+	end_src_offset = src_window->offset +
+		(src_window->nr_pages << PAGE_SHIFT);
+	end_dst_offset = dst_window->offset +
+		(dst_window->nr_pages << PAGE_SHIFT);
+	while (remaining_len) {
+		if (src_offset == end_src_offset) {
+			src_window = list_next_entry(src_window, list);
+			end_src_offset = src_window->offset +
+				(src_window->nr_pages << PAGE_SHIFT);
+			scif_init_window_iter(src_window, &src_win_iter);
+		}
+		if (dst_offset == end_dst_offset) {
+			dst_window = list_next_entry(dst_window, list);
+			end_dst_offset = dst_window->offset +
+				(dst_window->nr_pages << PAGE_SHIFT);
+			scif_init_window_iter(dst_window, &dst_win_iter);
+		}
+
+		/* compute dma addresses for transfer */
+		src_dma_addr = scif_off_to_dma_addr(src_window, src_offset,
+						    &src_contig_bytes,
+						    &src_win_iter);
+		dst_dma_addr = scif_off_to_dma_addr(dst_window, dst_offset,
+						    &dst_contig_bytes,
+						    &dst_win_iter);
+		loop_len = min(src_contig_bytes, dst_contig_bytes);
+		loop_len = min(loop_len, remaining_len);
+		if (work->ordered && !(remaining_len - loop_len)) {
+			/*
+			 * Break up the last chunk of the transfer into two
+			 * steps to ensure that the last byte in step 2 is
+			 * updated last.
+			 */
+			/* Step 1) DMA: Body Length - 1 */
+			tx = dev->device_prep_dma_memcpy(chan, dst_dma_addr,
+							 src_dma_addr,
+							 loop_len - 1,
+							 DMA_PREP_FENCE);
+			if (!tx) {
+				ret = -ENOMEM;
+				goto err;
+			}
+			cookie = tx->tx_submit(tx);
+			if (dma_submit_error(cookie)) {
+				ret = -ENOMEM;
+				goto err;
+			}
+			src_offset += (loop_len - 1);
+			dst_offset += (loop_len - 1);
+			src_dma_addr += (loop_len - 1);
+			dst_dma_addr += (loop_len - 1);
+			remaining_len -= (loop_len - 1);
+			loop_len = remaining_len;
+
+			/* Step 2) DMA: 1 BYTES */
+			tx = dev->device_prep_dma_memcpy(chan, dst_dma_addr,
+					src_dma_addr, loop_len, 0);
+			if (!tx) {
+				ret = -ENOMEM;
+				goto err;
+			}
+			cookie = tx->tx_submit(tx);
+			if (dma_submit_error(cookie)) {
+				ret = -ENOMEM;
+				goto err;
+			}
+			dma_async_issue_pending(chan);
+		} else {
+			tx = dev->device_prep_dma_memcpy(chan, dst_dma_addr,
+					src_dma_addr, loop_len, 0);
+			if (!tx) {
+				ret = -ENOMEM;
+				goto err;
+			}
+			cookie = tx->tx_submit(tx);
+			if (dma_submit_error(cookie)) {
+				ret = -ENOMEM;
+				goto err;
+			}
+		}
+		src_offset += loop_len;
+		dst_offset += loop_len;
+		remaining_len -= loop_len;
+	}
+	return ret;
+err:
+	dev_err(scif_info.mdev.this_device,
+		"%s %d Desc Prog Failed ret %d\n",
+		__func__, __LINE__, ret);
+	return ret;
+}
+
+/*
+ * scif_rma_list_dma_copy_aligned:
+ *
+ * Traverse all the windows and perform DMA copy.
+ */
+static int scif_rma_list_dma_copy_aligned(struct scif_copy_work *work,
+					  struct dma_chan *chan)
+{
+	dma_addr_t src_dma_addr, dst_dma_addr;
+	size_t loop_len, remaining_len, tail_len, src_contig_bytes = 0;
+	size_t dst_contig_bytes = 0;
+	int src_cache_off;
+	s64 end_src_offset, end_dst_offset;
+	struct scif_window_iter src_win_iter;
+	struct scif_window_iter dst_win_iter;
+	void *src_virt, *dst_virt;
+	struct scif_window *src_window = work->src_window;
+	struct scif_window *dst_window = work->dst_window;
+	s64 src_offset = work->src_offset, dst_offset = work->dst_offset;
+	int ret = 0;
+	struct dma_async_tx_descriptor *tx;
+	struct dma_device *dev = chan->device;
+	dma_cookie_t cookie;
+
+	remaining_len = work->len;
+	scif_init_window_iter(src_window, &src_win_iter);
+	scif_init_window_iter(dst_window, &dst_win_iter);
+
+	src_cache_off = src_offset & (L1_CACHE_BYTES - 1);
+	if (src_cache_off != 0) {
+		/* Head */
+		loop_len = L1_CACHE_BYTES - src_cache_off;
+		loop_len = min(loop_len, remaining_len);
+		src_dma_addr = __scif_off_to_dma_addr(src_window, src_offset);
+		dst_dma_addr = __scif_off_to_dma_addr(dst_window, dst_offset);
+		if (src_window->type == SCIF_WINDOW_SELF)
+			src_virt = _get_local_va(src_offset, src_window,
+						 loop_len);
+		else
+			src_virt = ioremap_remote(src_offset, src_window,
+						  loop_len,
+						  work->remote_dev, NULL);
+		if (!src_virt)
+			return -ENOMEM;
+		if (dst_window->type == SCIF_WINDOW_SELF)
+			dst_virt = _get_local_va(dst_offset, dst_window,
+						 loop_len);
+		else
+			dst_virt = ioremap_remote(dst_offset, dst_window,
+						  loop_len,
+						  work->remote_dev, NULL);
+		if (!dst_virt) {
+			if (src_window->type != SCIF_WINDOW_SELF)
+				iounmap_remote(src_virt, loop_len, work);
+			return -ENOMEM;
+		}
+		if (src_window->type == SCIF_WINDOW_SELF)
+			scif_unaligned_cpy_toio(dst_virt, src_virt, loop_len,
+						remaining_len == loop_len ?
+						work->ordered : false);
+		else
+			scif_unaligned_cpy_fromio(dst_virt, src_virt, loop_len,
+						  remaining_len == loop_len ?
+						  work->ordered : false);
+		if (src_window->type != SCIF_WINDOW_SELF)
+			iounmap_remote(src_virt, loop_len, work);
+		if (dst_window->type != SCIF_WINDOW_SELF)
+			iounmap_remote(dst_virt, loop_len, work);
+		src_offset += loop_len;
+		dst_offset += loop_len;
+		remaining_len -= loop_len;
+	}
+
+	end_src_offset = src_window->offset +
+		(src_window->nr_pages << PAGE_SHIFT);
+	end_dst_offset = dst_window->offset +
+		(dst_window->nr_pages << PAGE_SHIFT);
+	tail_len = remaining_len & (L1_CACHE_BYTES - 1);
+	remaining_len -= tail_len;
+	while (remaining_len) {
+		if (src_offset == end_src_offset) {
+			src_window = list_next_entry(src_window, list);
+			end_src_offset = src_window->offset +
+				(src_window->nr_pages << PAGE_SHIFT);
+			scif_init_window_iter(src_window, &src_win_iter);
+		}
+		if (dst_offset == end_dst_offset) {
+			dst_window = list_next_entry(dst_window, list);
+			end_dst_offset = dst_window->offset +
+				(dst_window->nr_pages << PAGE_SHIFT);
+			scif_init_window_iter(dst_window, &dst_win_iter);
+		}
+
+		/* compute dma addresses for transfer */
+		src_dma_addr = scif_off_to_dma_addr(src_window, src_offset,
+						    &src_contig_bytes,
+						    &src_win_iter);
+		dst_dma_addr = scif_off_to_dma_addr(dst_window, dst_offset,
+						    &dst_contig_bytes,
+						    &dst_win_iter);
+		loop_len = min(src_contig_bytes, dst_contig_bytes);
+		loop_len = min(loop_len, remaining_len);
+		if (work->ordered && !tail_len &&
+		    !(remaining_len - loop_len)) {
+			/*
+			 * Break up the last chunk of the transfer into two
+			 * steps. if there is no tail to gurantee DMA ordering.
+			 * Passing SCIF_DMA_POLLING inserts a status update
+			 * descriptor in step 1 which acts as a double sided
+			 * synchronization fence for the DMA engine to ensure
+			 * that the last cache line in step 2 is updated last.
+			 */
+			/* Step 1) DMA: Body Length - L1_CACHE_BYTES. */
+			tx = dev->device_prep_dma_memcpy(chan, dst_dma_addr,
+							 src_dma_addr,
+							 loop_len -
+							 L1_CACHE_BYTES,
+							 DMA_PREP_FENCE);
+			if (!tx) {
+				ret = -ENOMEM;
+				goto err;
+			}
+			cookie = tx->tx_submit(tx);
+			if (dma_submit_error(cookie)) {
+				ret = -ENOMEM;
+				goto err;
+			}
+			dma_async_issue_pending(chan);
+			src_offset += (loop_len - L1_CACHE_BYTES);
+			dst_offset += (loop_len - L1_CACHE_BYTES);
+			src_dma_addr += (loop_len - L1_CACHE_BYTES);
+			dst_dma_addr += (loop_len - L1_CACHE_BYTES);
+			remaining_len -= (loop_len - L1_CACHE_BYTES);
+			loop_len = remaining_len;
+
+			/* Step 2) DMA: L1_CACHE_BYTES */
+			tx = dev->device_prep_dma_memcpy(chan, dst_dma_addr,
+							 src_dma_addr,
+							 loop_len, 0);
+			if (!tx) {
+				ret = -ENOMEM;
+				goto err;
+			}
+			cookie = tx->tx_submit(tx);
+			if (dma_submit_error(cookie)) {
+				ret = -ENOMEM;
+				goto err;
+			}
+			dma_async_issue_pending(chan);
+		} else {
+			tx = dev->device_prep_dma_memcpy(chan, dst_dma_addr,
+							 src_dma_addr,
+							 loop_len, 0);
+			if (!tx) {
+				ret = -ENOMEM;
+				goto err;
+			}
+			cookie = tx->tx_submit(tx);
+			if (dma_submit_error(cookie)) {
+				ret = -ENOMEM;
+				goto err;
+			}
+			dma_async_issue_pending(chan);
+		}
+		src_offset += loop_len;
+		dst_offset += loop_len;
+		remaining_len -= loop_len;
+	}
+	remaining_len = tail_len;
+	if (remaining_len) {
+		loop_len = remaining_len;
+		if (src_offset == end_src_offset)
+			src_window = list_next_entry(src_window, list);
+		if (dst_offset == end_dst_offset)
+			dst_window = list_next_entry(dst_window, list);
+
+		src_dma_addr = __scif_off_to_dma_addr(src_window, src_offset);
+		dst_dma_addr = __scif_off_to_dma_addr(dst_window, dst_offset);
+		/*
+		 * The CPU copy for the tail bytes must be initiated only once
+		 * previous DMA transfers for this endpoint have completed to
+		 * guarantee ordering.
+		 */
+		if (work->ordered) {
+			struct scif_dev *rdev = work->remote_dev;
+
+			ret = scif_drain_dma_poll(rdev->sdev, chan);
+			if (ret)
+				return ret;
+		}
+		if (src_window->type == SCIF_WINDOW_SELF)
+			src_virt = _get_local_va(src_offset, src_window,
+						 loop_len);
+		else
+			src_virt = ioremap_remote(src_offset, src_window,
+						  loop_len,
+						  work->remote_dev, NULL);
+		if (!src_virt)
+			return -ENOMEM;
+
+		if (dst_window->type == SCIF_WINDOW_SELF)
+			dst_virt = _get_local_va(dst_offset, dst_window,
+						 loop_len);
+		else
+			dst_virt = ioremap_remote(dst_offset, dst_window,
+						  loop_len,
+						  work->remote_dev, NULL);
+		if (!dst_virt) {
+			if (src_window->type != SCIF_WINDOW_SELF)
+				iounmap_remote(src_virt, loop_len, work);
+			return -ENOMEM;
+		}
+
+		if (src_window->type == SCIF_WINDOW_SELF)
+			scif_unaligned_cpy_toio(dst_virt, src_virt, loop_len,
+						work->ordered);
+		else
+			scif_unaligned_cpy_fromio(dst_virt, src_virt,
+						  loop_len, work->ordered);
+		if (src_window->type != SCIF_WINDOW_SELF)
+			iounmap_remote(src_virt, loop_len, work);
+
+		if (dst_window->type != SCIF_WINDOW_SELF)
+			iounmap_remote(dst_virt, loop_len, work);
+		remaining_len -= loop_len;
+	}
+	return ret;
+err:
+	dev_err(scif_info.mdev.this_device,
+		"%s %d Desc Prog Failed ret %d\n",
+		__func__, __LINE__, ret);
+	return ret;
+}
+
+/*
+ * scif_rma_list_cpu_copy:
+ *
+ * Traverse all the windows and perform CPU copy.
+ */
+static int scif_rma_list_cpu_copy(struct scif_copy_work *work)
+{
+	void *src_virt, *dst_virt;
+	size_t loop_len, remaining_len;
+	int src_page_off, dst_page_off;
+	s64 src_offset = work->src_offset, dst_offset = work->dst_offset;
+	struct scif_window *src_window = work->src_window;
+	struct scif_window *dst_window = work->dst_window;
+	s64 end_src_offset, end_dst_offset;
+	int ret = 0;
+	struct scif_window_iter src_win_iter;
+	struct scif_window_iter dst_win_iter;
+
+	remaining_len = work->len;
+
+	scif_init_window_iter(src_window, &src_win_iter);
+	scif_init_window_iter(dst_window, &dst_win_iter);
+	while (remaining_len) {
+		src_page_off = src_offset & ~PAGE_MASK;
+		dst_page_off = dst_offset & ~PAGE_MASK;
+		loop_len = min(PAGE_SIZE -
+			       max(src_page_off, dst_page_off),
+			       remaining_len);
+
+		if (src_window->type == SCIF_WINDOW_SELF)
+			src_virt = _get_local_va(src_offset, src_window,
+						 loop_len);
+		else
+			src_virt = ioremap_remote(src_offset, src_window,
+						  loop_len,
+						  work->remote_dev,
+						  &src_win_iter);
+		if (!src_virt) {
+			ret = -ENOMEM;
+			goto error;
+		}
+
+		if (dst_window->type == SCIF_WINDOW_SELF)
+			dst_virt = _get_local_va(dst_offset, dst_window,
+						 loop_len);
+		else
+			dst_virt = ioremap_remote(dst_offset, dst_window,
+						  loop_len,
+						  work->remote_dev,
+						  &dst_win_iter);
+		if (!dst_virt) {
+			if (src_window->type == SCIF_WINDOW_PEER)
+				iounmap_remote(src_virt, loop_len, work);
+			ret = -ENOMEM;
+			goto error;
+		}
+
+		if (work->loopback) {
+			memcpy(dst_virt, src_virt, loop_len);
+		} else {
+			if (src_window->type == SCIF_WINDOW_SELF)
+				memcpy_toio((void __iomem __force *)dst_virt,
+					    src_virt, loop_len);
+			else
+				memcpy_fromio(dst_virt,
+					      (void __iomem __force *)src_virt,
+					      loop_len);
+		}
+		if (src_window->type == SCIF_WINDOW_PEER)
+			iounmap_remote(src_virt, loop_len, work);
+
+		if (dst_window->type == SCIF_WINDOW_PEER)
+			iounmap_remote(dst_virt, loop_len, work);
+
+		src_offset += loop_len;
+		dst_offset += loop_len;
+		remaining_len -= loop_len;
+		if (remaining_len) {
+			end_src_offset = src_window->offset +
+				(src_window->nr_pages << PAGE_SHIFT);
+			end_dst_offset = dst_window->offset +
+				(dst_window->nr_pages << PAGE_SHIFT);
+			if (src_offset == end_src_offset) {
+				src_window = list_next_entry(src_window, list);
+				scif_init_window_iter(src_window,
+						      &src_win_iter);
+			}
+			if (dst_offset == end_dst_offset) {
+				dst_window = list_next_entry(dst_window, list);
+				scif_init_window_iter(dst_window,
+						      &dst_win_iter);
+			}
+		}
+	}
+error:
+	return ret;
+}
+
+static int scif_rma_list_dma_copy_wrapper(struct scif_endpt *epd,
+					  struct scif_copy_work *work,
+					  struct dma_chan *chan, off_t loffset)
+{
+	int src_cache_off, dst_cache_off;
+	s64 src_offset = work->src_offset, dst_offset = work->dst_offset;
+	u8 *temp = NULL;
+	bool src_local = true, dst_local = false;
+	struct scif_dma_comp_cb *comp_cb;
+	dma_addr_t src_dma_addr, dst_dma_addr;
+	int err;
+
+	if (is_dma_copy_aligned(chan->device, 1, 1, 1))
+		return _scif_rma_list_dma_copy_aligned(work, chan);
+
+	src_cache_off = src_offset & (L1_CACHE_BYTES - 1);
+	dst_cache_off = dst_offset & (L1_CACHE_BYTES - 1);
+
+	if (dst_cache_off == src_cache_off)
+		return scif_rma_list_dma_copy_aligned(work, chan);
+
+	if (work->loopback)
+		return scif_rma_list_cpu_copy(work);
+	src_dma_addr = __scif_off_to_dma_addr(work->src_window, src_offset);
+	dst_dma_addr = __scif_off_to_dma_addr(work->dst_window, dst_offset);
+	src_local = work->src_window->type == SCIF_WINDOW_SELF;
+	dst_local = work->dst_window->type == SCIF_WINDOW_SELF;
+
+	dst_local = dst_local;
+	/* Allocate dma_completion cb */
+	comp_cb = kzalloc(sizeof(*comp_cb), GFP_KERNEL);
+	if (!comp_cb)
+		goto error;
+
+	work->comp_cb = comp_cb;
+	comp_cb->cb_cookie = comp_cb;
+	comp_cb->dma_completion_func = &scif_rma_completion_cb;
+
+	if (work->len + (L1_CACHE_BYTES << 1) < SCIF_KMEM_UNALIGNED_BUF_SIZE) {
+		comp_cb->is_cache = false;
+		/* Allocate padding bytes to align to a cache line */
+		temp = kmalloc(work->len + (L1_CACHE_BYTES << 1),
+			       GFP_KERNEL);
+		if (!temp)
+			goto free_comp_cb;
+		comp_cb->temp_buf_to_free = temp;
+		/* kmalloc(..) does not guarantee cache line alignment */
+		if (!IS_ALIGNED((u64)temp, L1_CACHE_BYTES))
+			temp = PTR_ALIGN(temp, L1_CACHE_BYTES);
+	} else {
+		comp_cb->is_cache = true;
+		temp = kmem_cache_alloc(unaligned_cache, GFP_KERNEL);
+		if (!temp)
+			goto free_comp_cb;
+		comp_cb->temp_buf_to_free = temp;
+	}
+
+	if (src_local) {
+		temp += dst_cache_off;
+		scif_rma_local_cpu_copy(work->src_offset, work->src_window,
+					temp, work->len, true);
+	} else {
+		comp_cb->dst_window = work->dst_window;
+		comp_cb->dst_offset = work->dst_offset;
+		work->src_offset = work->src_offset - src_cache_off;
+		comp_cb->len = work->len;
+		work->len = ALIGN(work->len + src_cache_off, L1_CACHE_BYTES);
+		comp_cb->header_padding = src_cache_off;
+	}
+	comp_cb->temp_buf = temp;
+
+	err = scif_map_single(&comp_cb->temp_phys, temp,
+			      work->remote_dev, SCIF_KMEM_UNALIGNED_BUF_SIZE);
+	if (err)
+		goto free_temp_buf;
+	comp_cb->sdev = work->remote_dev;
+	if (scif_rma_list_dma_copy_unaligned(work, temp, chan, src_local) < 0)
+		goto free_temp_buf;
+	if (!src_local)
+		work->fence_type = SCIF_DMA_INTR;
+	return 0;
+free_temp_buf:
+	if (comp_cb->is_cache)
+		kmem_cache_free(unaligned_cache, comp_cb->temp_buf_to_free);
+	else
+		kfree(comp_cb->temp_buf_to_free);
+free_comp_cb:
+	kfree(comp_cb);
+error:
+	return -ENOMEM;
+}
+
+/**
+ * scif_rma_copy:
+ * @epd: end point descriptor.
+ * @loffset: offset in local registered address space to/from which to copy
+ * @addr: user virtual address to/from which to copy
+ * @len: length of range to copy
+ * @roffset: offset in remote registered address space to/from which to copy
+ * @flags: flags
+ * @dir: LOCAL->REMOTE or vice versa.
+ * @last_chunk: true if this is the last chunk of a larger transfer
+ *
+ * Validate parameters, check if src/dst registered ranges requested for copy
+ * are valid and initiate either CPU or DMA copy.
+ */
+static int scif_rma_copy(scif_epd_t epd, off_t loffset, unsigned long addr,
+			 size_t len, off_t roffset, int flags,
+			 enum scif_rma_dir dir, bool last_chunk)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	struct scif_rma_req remote_req;
+	struct scif_rma_req req;
+	struct scif_window *local_window = NULL;
+	struct scif_window *remote_window = NULL;
+	struct scif_copy_work copy_work;
+	bool loopback;
+	int err = 0;
+	struct dma_chan *chan;
+	struct scif_mmu_notif *mmn = NULL;
+	bool cache = false;
+	struct device *spdev;
+
+	err = scif_verify_epd(ep);
+	if (err)
+		return err;
+
+	if (flags && !(flags & (SCIF_RMA_USECPU | SCIF_RMA_USECACHE |
+				SCIF_RMA_SYNC | SCIF_RMA_ORDERED)))
+		return -EINVAL;
+
+	loopback = scifdev_self(ep->remote_dev) ? true : false;
+	copy_work.fence_type = ((flags & SCIF_RMA_SYNC) && last_chunk) ?
+				SCIF_DMA_POLL : 0;
+	copy_work.ordered = !!((flags & SCIF_RMA_ORDERED) && last_chunk);
+
+	/* Use CPU for Mgmt node <-> Mgmt node copies */
+	if (loopback && scif_is_mgmt_node()) {
+		flags |= SCIF_RMA_USECPU;
+		copy_work.fence_type = 0x0;
+	}
+
+	cache = scif_is_set_reg_cache(flags);
+
+	remote_req.out_window = &remote_window;
+	remote_req.offset = roffset;
+	remote_req.nr_bytes = len;
+	/*
+	 * If transfer is from local to remote then the remote window
+	 * must be writeable and vice versa.
+	 */
+	remote_req.prot = dir == SCIF_LOCAL_TO_REMOTE ? VM_WRITE : VM_READ;
+	remote_req.type = SCIF_WINDOW_PARTIAL;
+	remote_req.head = &ep->rma_info.remote_reg_list;
+
+	spdev = scif_get_peer_dev(ep->remote_dev);
+	if (IS_ERR(spdev)) {
+		err = PTR_ERR(spdev);
+		return err;
+	}
+
+	if (addr && cache) {
+		mutex_lock(&ep->rma_info.mmn_lock);
+		mmn = scif_find_mmu_notifier(current->mm, &ep->rma_info);
+		if (!mmn)
+			mmn = scif_add_mmu_notifier(current->mm, ep);
+		mutex_unlock(&ep->rma_info.mmn_lock);
+		if (IS_ERR(mmn)) {
+			scif_put_peer_dev(spdev);
+			return PTR_ERR(mmn);
+		}
+		cache = cache && !scif_rma_tc_can_cache(ep, len);
+	}
+	mutex_lock(&ep->rma_info.rma_lock);
+	if (addr) {
+		req.out_window = &local_window;
+		req.nr_bytes = ALIGN(len + (addr & ~PAGE_MASK),
+				     PAGE_SIZE);
+		req.va_for_temp = addr & PAGE_MASK;
+		req.prot = (dir == SCIF_LOCAL_TO_REMOTE ?
+			    VM_READ : VM_WRITE | VM_READ);
+		/* Does a valid local window exist? */
+		if (mmn) {
+			spin_lock(&ep->rma_info.tc_lock);
+			req.head = &mmn->tc_reg_list;
+			err = scif_query_tcw(ep, &req);
+			spin_unlock(&ep->rma_info.tc_lock);
+		}
+		if (!mmn || err) {
+			err = scif_register_temp(epd, req.va_for_temp,
+						 req.nr_bytes, req.prot,
+						 &loffset, &local_window);
+			if (err) {
+				mutex_unlock(&ep->rma_info.rma_lock);
+				goto error;
+			}
+			if (!cache)
+				goto skip_cache;
+			atomic_inc(&ep->rma_info.tcw_refcount);
+			atomic_add_return(local_window->nr_pages,
+					  &ep->rma_info.tcw_total_pages);
+			if (mmn) {
+				spin_lock(&ep->rma_info.tc_lock);
+				scif_insert_tcw(local_window,
+						&mmn->tc_reg_list);
+				spin_unlock(&ep->rma_info.tc_lock);
+			}
+		}
+skip_cache:
+		loffset = local_window->offset +
+				(addr - local_window->va_for_temp);
+	} else {
+		req.out_window = &local_window;
+		req.offset = loffset;
+		/*
+		 * If transfer is from local to remote then the self window
+		 * must be readable and vice versa.
+		 */
+		req.prot = dir == SCIF_LOCAL_TO_REMOTE ? VM_READ : VM_WRITE;
+		req.nr_bytes = len;
+		req.type = SCIF_WINDOW_PARTIAL;
+		req.head = &ep->rma_info.reg_list;
+		/* Does a valid local window exist? */
+		err = scif_query_window(&req);
+		if (err) {
+			mutex_unlock(&ep->rma_info.rma_lock);
+			goto error;
+		}
+	}
+
+	/* Does a valid remote window exist? */
+	err = scif_query_window(&remote_req);
+	if (err) {
+		mutex_unlock(&ep->rma_info.rma_lock);
+		goto error;
+	}
+
+	/*
+	 * Prepare copy_work for submitting work to the DMA kernel thread
+	 * or CPU copy routine.
+	 */
+	copy_work.len = len;
+	copy_work.loopback = loopback;
+	copy_work.remote_dev = ep->remote_dev;
+	if (dir == SCIF_LOCAL_TO_REMOTE) {
+		copy_work.src_offset = loffset;
+		copy_work.src_window = local_window;
+		copy_work.dst_offset = roffset;
+		copy_work.dst_window = remote_window;
+	} else {
+		copy_work.src_offset = roffset;
+		copy_work.src_window = remote_window;
+		copy_work.dst_offset = loffset;
+		copy_work.dst_window = local_window;
+	}
+
+	if (flags & SCIF_RMA_USECPU) {
+		scif_rma_list_cpu_copy(&copy_work);
+	} else {
+		chan = ep->rma_info.dma_chan;
+		err = scif_rma_list_dma_copy_wrapper(epd, &copy_work,
+						     chan, loffset);
+	}
+	if (addr && !cache)
+		atomic_inc(&ep->rma_info.tw_refcount);
+
+	mutex_unlock(&ep->rma_info.rma_lock);
+
+	if (last_chunk) {
+		struct scif_dev *rdev = ep->remote_dev;
+
+		if (copy_work.fence_type == SCIF_DMA_POLL)
+			err = scif_drain_dma_poll(rdev->sdev,
+						  ep->rma_info.dma_chan);
+		else if (copy_work.fence_type == SCIF_DMA_INTR)
+			err = scif_drain_dma_intr(rdev->sdev,
+						  ep->rma_info.dma_chan);
+	}
+
+	if (addr && !cache)
+		scif_queue_for_cleanup(local_window, &scif_info.rma);
+	scif_put_peer_dev(spdev);
+	return err;
+error:
+	if (err) {
+		if (addr && local_window && !cache)
+			scif_destroy_window(ep, local_window);
+		dev_err(scif_info.mdev.this_device,
+			"%s %d err %d len 0x%lx\n",
+			__func__, __LINE__, err, len);
+	}
+	scif_put_peer_dev(spdev);
+	return err;
+}
+
+int scif_readfrom(scif_epd_t epd, off_t loffset, size_t len,
+		  off_t roffset, int flags)
+{
+	int err;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI readfrom: ep %p loffset 0x%lx len 0x%lx offset 0x%lx flags 0x%x\n",
+		epd, loffset, len, roffset, flags);
+	if (scif_unaligned(loffset, roffset)) {
+		while (len > SCIF_MAX_UNALIGNED_BUF_SIZE) {
+			err = scif_rma_copy(epd, loffset, 0x0,
+					    SCIF_MAX_UNALIGNED_BUF_SIZE,
+					    roffset, flags,
+					    SCIF_REMOTE_TO_LOCAL, false);
+			if (err)
+				goto readfrom_err;
+			loffset += SCIF_MAX_UNALIGNED_BUF_SIZE;
+			roffset += SCIF_MAX_UNALIGNED_BUF_SIZE;
+			len -= SCIF_MAX_UNALIGNED_BUF_SIZE;
+		}
+	}
+	err = scif_rma_copy(epd, loffset, 0x0, len,
+			    roffset, flags, SCIF_REMOTE_TO_LOCAL, true);
+readfrom_err:
+	return err;
+}
+EXPORT_SYMBOL_GPL(scif_readfrom);
+
+int scif_writeto(scif_epd_t epd, off_t loffset, size_t len,
+		 off_t roffset, int flags)
+{
+	int err;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI writeto: ep %p loffset 0x%lx len 0x%lx roffset 0x%lx flags 0x%x\n",
+		epd, loffset, len, roffset, flags);
+	if (scif_unaligned(loffset, roffset)) {
+		while (len > SCIF_MAX_UNALIGNED_BUF_SIZE) {
+			err = scif_rma_copy(epd, loffset, 0x0,
+					    SCIF_MAX_UNALIGNED_BUF_SIZE,
+					    roffset, flags,
+					    SCIF_LOCAL_TO_REMOTE, false);
+			if (err)
+				goto writeto_err;
+			loffset += SCIF_MAX_UNALIGNED_BUF_SIZE;
+			roffset += SCIF_MAX_UNALIGNED_BUF_SIZE;
+			len -= SCIF_MAX_UNALIGNED_BUF_SIZE;
+		}
+	}
+	err = scif_rma_copy(epd, loffset, 0x0, len,
+			    roffset, flags, SCIF_LOCAL_TO_REMOTE, true);
+writeto_err:
+	return err;
+}
+EXPORT_SYMBOL_GPL(scif_writeto);
+
+int scif_vreadfrom(scif_epd_t epd, void *addr, size_t len,
+		   off_t roffset, int flags)
+{
+	int err;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI vreadfrom: ep %p addr %p len 0x%lx roffset 0x%lx flags 0x%x\n",
+		epd, addr, len, roffset, flags);
+	if (scif_unaligned((off_t __force)addr, roffset)) {
+		if (len > SCIF_MAX_UNALIGNED_BUF_SIZE)
+			flags &= ~SCIF_RMA_USECACHE;
+
+		while (len > SCIF_MAX_UNALIGNED_BUF_SIZE) {
+			err = scif_rma_copy(epd, 0, (u64)addr,
+					    SCIF_MAX_UNALIGNED_BUF_SIZE,
+					    roffset, flags,
+					    SCIF_REMOTE_TO_LOCAL, false);
+			if (err)
+				goto vreadfrom_err;
+			addr += SCIF_MAX_UNALIGNED_BUF_SIZE;
+			roffset += SCIF_MAX_UNALIGNED_BUF_SIZE;
+			len -= SCIF_MAX_UNALIGNED_BUF_SIZE;
+		}
+	}
+	err = scif_rma_copy(epd, 0, (u64)addr, len,
+			    roffset, flags, SCIF_REMOTE_TO_LOCAL, true);
+vreadfrom_err:
+	return err;
+}
+EXPORT_SYMBOL_GPL(scif_vreadfrom);
+
+int scif_vwriteto(scif_epd_t epd, void *addr, size_t len,
+		  off_t roffset, int flags)
+{
+	int err;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI vwriteto: ep %p addr %p len 0x%lx roffset 0x%lx flags 0x%x\n",
+		epd, addr, len, roffset, flags);
+	if (scif_unaligned((off_t __force)addr, roffset)) {
+		if (len > SCIF_MAX_UNALIGNED_BUF_SIZE)
+			flags &= ~SCIF_RMA_USECACHE;
+
+		while (len > SCIF_MAX_UNALIGNED_BUF_SIZE) {
+			err = scif_rma_copy(epd, 0, (u64)addr,
+					    SCIF_MAX_UNALIGNED_BUF_SIZE,
+					    roffset, flags,
+					    SCIF_LOCAL_TO_REMOTE, false);
+			if (err)
+				goto vwriteto_err;
+			addr += SCIF_MAX_UNALIGNED_BUF_SIZE;
+			roffset += SCIF_MAX_UNALIGNED_BUF_SIZE;
+			len -= SCIF_MAX_UNALIGNED_BUF_SIZE;
+		}
+	}
+	err = scif_rma_copy(epd, 0, (u64)addr, len,
+			    roffset, flags, SCIF_LOCAL_TO_REMOTE, true);
+vwriteto_err:
+	return err;
+}
+EXPORT_SYMBOL_GPL(scif_vwriteto);
diff --git a/drivers/misc/mic/scif/scif_epd.c b/drivers/misc/mic/scif/scif_epd.c
new file mode 100644
index 000000000..00e5d6d66
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_epd.c
@@ -0,0 +1,357 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include "scif_main.h"
+#include "scif_map.h"
+
+void scif_cleanup_ep_qp(struct scif_endpt *ep)
+{
+	struct scif_qp *qp = ep->qp_info.qp;
+
+	if (qp->outbound_q.rb_base) {
+		scif_iounmap((void *)qp->outbound_q.rb_base,
+			     qp->outbound_q.size, ep->remote_dev);
+		qp->outbound_q.rb_base = NULL;
+	}
+	if (qp->remote_qp) {
+		scif_iounmap((void *)qp->remote_qp,
+			     sizeof(struct scif_qp), ep->remote_dev);
+		qp->remote_qp = NULL;
+	}
+	if (qp->local_qp) {
+		scif_unmap_single(qp->local_qp, ep->remote_dev,
+				  sizeof(struct scif_qp));
+		qp->local_qp = 0x0;
+	}
+	if (qp->local_buf) {
+		scif_unmap_single(qp->local_buf, ep->remote_dev,
+				  SCIF_ENDPT_QP_SIZE);
+		qp->local_buf = 0;
+	}
+}
+
+void scif_teardown_ep(void *endpt)
+{
+	struct scif_endpt *ep = endpt;
+	struct scif_qp *qp = ep->qp_info.qp;
+
+	if (qp) {
+		spin_lock(&ep->lock);
+		scif_cleanup_ep_qp(ep);
+		spin_unlock(&ep->lock);
+		kfree(qp->inbound_q.rb_base);
+		kfree(qp);
+	}
+}
+
+/*
+ * Enqueue the endpoint to the zombie list for cleanup.
+ * The endpoint should not be accessed once this API returns.
+ */
+void scif_add_epd_to_zombie_list(struct scif_endpt *ep, bool eplock_held)
+{
+	if (!eplock_held)
+		mutex_lock(&scif_info.eplock);
+	spin_lock(&ep->lock);
+	ep->state = SCIFEP_ZOMBIE;
+	spin_unlock(&ep->lock);
+	list_add_tail(&ep->list, &scif_info.zombie);
+	scif_info.nr_zombies++;
+	if (!eplock_held)
+		mutex_unlock(&scif_info.eplock);
+	schedule_work(&scif_info.misc_work);
+}
+
+static struct scif_endpt *scif_find_listen_ep(u16 port)
+{
+	struct scif_endpt *ep = NULL;
+	struct list_head *pos, *tmpq;
+
+	mutex_lock(&scif_info.eplock);
+	list_for_each_safe(pos, tmpq, &scif_info.listen) {
+		ep = list_entry(pos, struct scif_endpt, list);
+		if (ep->port.port == port) {
+			mutex_unlock(&scif_info.eplock);
+			return ep;
+		}
+	}
+	mutex_unlock(&scif_info.eplock);
+	return NULL;
+}
+
+void scif_cleanup_zombie_epd(void)
+{
+	struct list_head *pos, *tmpq;
+	struct scif_endpt *ep;
+
+	mutex_lock(&scif_info.eplock);
+	list_for_each_safe(pos, tmpq, &scif_info.zombie) {
+		ep = list_entry(pos, struct scif_endpt, list);
+		if (scif_rma_ep_can_uninit(ep)) {
+			list_del(pos);
+			scif_info.nr_zombies--;
+			put_iova_domain(&ep->rma_info.iovad);
+			kfree(ep);
+		}
+	}
+	mutex_unlock(&scif_info.eplock);
+}
+
+/**
+ * scif_cnctreq() - Respond to SCIF_CNCT_REQ interrupt message
+ * @msg:        Interrupt message
+ *
+ * This message is initiated by the remote node to request a connection
+ * to the local node.  This function looks for an end point in the
+ * listen state on the requested port id.
+ *
+ * If it finds a listening port it places the connect request on the
+ * listening end points queue and wakes up any pending accept calls.
+ *
+ * If it does not find a listening end point it sends a connection
+ * reject message to the remote node.
+ */
+void scif_cnctreq(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = NULL;
+	struct scif_conreq *conreq;
+
+	conreq = kmalloc(sizeof(*conreq), GFP_KERNEL);
+	if (!conreq)
+		/* Lack of resources so reject the request. */
+		goto conreq_sendrej;
+
+	ep = scif_find_listen_ep(msg->dst.port);
+	if (!ep)
+		/*  Send reject due to no listening ports */
+		goto conreq_sendrej_free;
+	else
+		spin_lock(&ep->lock);
+
+	if (ep->backlog <= ep->conreqcnt) {
+		/*  Send reject due to too many pending requests */
+		spin_unlock(&ep->lock);
+		goto conreq_sendrej_free;
+	}
+
+	conreq->msg = *msg;
+	list_add_tail(&conreq->list, &ep->conlist);
+	ep->conreqcnt++;
+	wake_up_interruptible(&ep->conwq);
+	spin_unlock(&ep->lock);
+	return;
+
+conreq_sendrej_free:
+	kfree(conreq);
+conreq_sendrej:
+	msg->uop = SCIF_CNCT_REJ;
+	scif_nodeqp_send(&scif_dev[msg->src.node], msg);
+}
+
+/**
+ * scif_cnctgnt() - Respond to SCIF_CNCT_GNT interrupt message
+ * @msg:        Interrupt message
+ *
+ * An accept() on the remote node has occurred and sent this message
+ * to indicate success.  Place the end point in the MAPPING state and
+ * save the remote nodes memory information.  Then wake up the connect
+ * request so it can finish.
+ */
+void scif_cnctgnt(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+
+	spin_lock(&ep->lock);
+	if (SCIFEP_CONNECTING == ep->state) {
+		ep->peer.node = msg->src.node;
+		ep->peer.port = msg->src.port;
+		ep->qp_info.gnt_pld = msg->payload[1];
+		ep->remote_ep = msg->payload[2];
+		ep->state = SCIFEP_MAPPING;
+
+		wake_up(&ep->conwq);
+	}
+	spin_unlock(&ep->lock);
+}
+
+/**
+ * scif_cnctgnt_ack() - Respond to SCIF_CNCT_GNTACK interrupt message
+ * @msg:        Interrupt message
+ *
+ * The remote connection request has finished mapping the local memory.
+ * Place the connection in the connected state and wake up the pending
+ * accept() call.
+ */
+void scif_cnctgnt_ack(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+
+	mutex_lock(&scif_info.connlock);
+	spin_lock(&ep->lock);
+	/* New ep is now connected with all resources set. */
+	ep->state = SCIFEP_CONNECTED;
+	list_add_tail(&ep->list, &scif_info.connected);
+	wake_up(&ep->conwq);
+	spin_unlock(&ep->lock);
+	mutex_unlock(&scif_info.connlock);
+}
+
+/**
+ * scif_cnctgnt_nack() - Respond to SCIF_CNCT_GNTNACK interrupt message
+ * @msg:        Interrupt message
+ *
+ * The remote connection request failed to map the local memory it was sent.
+ * Place the end point in the CLOSING state to indicate it and wake up
+ * the pending accept();
+ */
+void scif_cnctgnt_nack(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+
+	spin_lock(&ep->lock);
+	ep->state = SCIFEP_CLOSING;
+	wake_up(&ep->conwq);
+	spin_unlock(&ep->lock);
+}
+
+/**
+ * scif_cnctrej() - Respond to SCIF_CNCT_REJ interrupt message
+ * @msg:        Interrupt message
+ *
+ * The remote end has rejected the connection request.  Set the end
+ * point back to the bound state and wake up the pending connect().
+ */
+void scif_cnctrej(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+
+	spin_lock(&ep->lock);
+	if (SCIFEP_CONNECTING == ep->state) {
+		ep->state = SCIFEP_BOUND;
+		wake_up(&ep->conwq);
+	}
+	spin_unlock(&ep->lock);
+}
+
+/**
+ * scif_discnct() - Respond to SCIF_DISCNCT interrupt message
+ * @msg:        Interrupt message
+ *
+ * The remote node has indicated close() has been called on its end
+ * point.  Remove the local end point from the connected list, set its
+ * state to disconnected and ensure accesses to the remote node are
+ * shutdown.
+ *
+ * When all accesses to the remote end have completed then send a
+ * DISCNT_ACK to indicate it can remove its resources and complete
+ * the close routine.
+ */
+void scif_discnct(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = NULL;
+	struct scif_endpt *tmpep;
+	struct list_head *pos, *tmpq;
+
+	mutex_lock(&scif_info.connlock);
+	list_for_each_safe(pos, tmpq, &scif_info.connected) {
+		tmpep = list_entry(pos, struct scif_endpt, list);
+		/*
+		 * The local ep may have sent a disconnect and and been closed
+		 * due to a message response time out. It may have been
+		 * allocated again and formed a new connection so we want to
+		 * check if the remote ep matches
+		 */
+		if (((u64)tmpep == msg->payload[1]) &&
+		    ((u64)tmpep->remote_ep == msg->payload[0])) {
+			list_del(pos);
+			ep = tmpep;
+			spin_lock(&ep->lock);
+			break;
+		}
+	}
+
+	/*
+	 * If the terminated end is not found then this side started closing
+	 * before the other side sent the disconnect.  If so the ep will no
+	 * longer be on the connected list.  Regardless the other side
+	 * needs to be acked to let it know close is complete.
+	 */
+	if (!ep) {
+		mutex_unlock(&scif_info.connlock);
+		goto discnct_ack;
+	}
+
+	ep->state = SCIFEP_DISCONNECTED;
+	list_add_tail(&ep->list, &scif_info.disconnected);
+
+	wake_up_interruptible(&ep->sendwq);
+	wake_up_interruptible(&ep->recvwq);
+	spin_unlock(&ep->lock);
+	mutex_unlock(&scif_info.connlock);
+
+discnct_ack:
+	msg->uop = SCIF_DISCNT_ACK;
+	scif_nodeqp_send(&scif_dev[msg->src.node], msg);
+}
+
+/**
+ * scif_discnct_ack() - Respond to SCIF_DISCNT_ACK interrupt message
+ * @msg:        Interrupt message
+ *
+ * Remote side has indicated it has not more references to local resources
+ */
+void scif_discnt_ack(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+
+	spin_lock(&ep->lock);
+	ep->state = SCIFEP_DISCONNECTED;
+	spin_unlock(&ep->lock);
+	complete(&ep->discon);
+}
+
+/**
+ * scif_clientsend() - Respond to SCIF_CLIENT_SEND interrupt message
+ * @msg:        Interrupt message
+ *
+ * Remote side is confirming send or receive interrupt handling is complete.
+ */
+void scif_clientsend(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+
+	spin_lock(&ep->lock);
+	if (SCIFEP_CONNECTED == ep->state)
+		wake_up_interruptible(&ep->recvwq);
+	spin_unlock(&ep->lock);
+}
+
+/**
+ * scif_clientrcvd() - Respond to SCIF_CLIENT_RCVD interrupt message
+ * @msg:        Interrupt message
+ *
+ * Remote side is confirming send or receive interrupt handling is complete.
+ */
+void scif_clientrcvd(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+
+	spin_lock(&ep->lock);
+	if (SCIFEP_CONNECTED == ep->state)
+		wake_up_interruptible(&ep->sendwq);
+	spin_unlock(&ep->lock);
+}
diff --git a/drivers/misc/mic/scif/scif_epd.h b/drivers/misc/mic/scif/scif_epd.h
new file mode 100644
index 000000000..f39b663da
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_epd.h
@@ -0,0 +1,210 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#ifndef SCIF_EPD_H
+#define SCIF_EPD_H
+
+#include <linux/delay.h>
+#include <linux/scif.h>
+#include <linux/scif_ioctl.h>
+
+#define SCIF_EPLOCK_HELD true
+
+enum scif_epd_state {
+	SCIFEP_UNBOUND,
+	SCIFEP_BOUND,
+	SCIFEP_LISTENING,
+	SCIFEP_CONNECTED,
+	SCIFEP_CONNECTING,
+	SCIFEP_MAPPING,
+	SCIFEP_CLOSING,
+	SCIFEP_CLLISTEN,
+	SCIFEP_DISCONNECTED,
+	SCIFEP_ZOMBIE
+};
+
+/*
+ * struct scif_conreq - Data structure added to the connection list.
+ *
+ * @msg: connection request message received
+ * @list: link to list of connection requests
+ */
+struct scif_conreq {
+	struct scifmsg msg;
+	struct list_head list;
+};
+
+/* Size of the RB for the Endpoint QP */
+#define SCIF_ENDPT_QP_SIZE 0x1000
+
+/*
+ * scif_endpt_qp_info - SCIF endpoint queue pair
+ *
+ * @qp - Qpair for this endpoint
+ * @qp_offset - DMA address of the QP
+ * @gnt_pld - Payload in a SCIF_CNCT_GNT message containing the
+ * physical address of the remote_qp.
+ */
+struct scif_endpt_qp_info {
+	struct scif_qp *qp;
+	dma_addr_t qp_offset;
+	dma_addr_t gnt_pld;
+};
+
+/*
+ * struct scif_endpt - The SCIF endpoint data structure
+ *
+ * @state: end point state
+ * @lock: lock synchronizing access to endpoint fields like state etc
+ * @port: self port information
+ * @peer: peer port information
+ * @backlog: maximum pending connection requests
+ * @qp_info: Endpoint QP information for SCIF messaging
+ * @remote_dev: scifdev used by this endpt to communicate with remote node.
+ * @remote_ep: remote endpoint
+ * @conreqcnt: Keep track of number of connection requests.
+ * @files: Open file information used to match the id passed in with
+ *         the flush routine.
+ * @conlist: list of connection requests
+ * @conwq: waitqueue for connection processing
+ * @discon: completion used during disconnection
+ * @sendwq: waitqueue used during sending messages
+ * @recvwq: waitqueue used during message receipt
+ * @sendlock: Synchronize ordering of messages sent
+ * @recvlock: Synchronize ordering of messages received
+ * @list: link to list of various endpoints like connected, listening etc
+ * @li_accept: pending ACCEPTREG
+ * @acceptcnt: pending ACCEPTREG cnt
+ * @liacceptlist: link to listen accept
+ * @miacceptlist: link to uaccept
+ * @listenep: associated listen ep
+ * @conn_work: Non blocking connect work
+ * @conn_port: Connection port
+ * @conn_err: Errors during connection
+ * @conn_async_state: Async connection
+ * @conn_pend_wq: Used by poll while waiting for incoming connections
+ * @conn_list: List of async connection requests
+ * @rma_info: Information for triggering SCIF RMA and DMA operations
+ * @mmu_list: link to list of MMU notifier cleanup work
+ * @anon: anonymous file for use in kernel mode scif poll
+ */
+struct scif_endpt {
+	enum scif_epd_state state;
+	spinlock_t lock;
+	struct scif_port_id port;
+	struct scif_port_id peer;
+	int backlog;
+	struct scif_endpt_qp_info qp_info;
+	struct scif_dev *remote_dev;
+	u64 remote_ep;
+	int conreqcnt;
+	struct files_struct *files;
+	struct list_head conlist;
+	wait_queue_head_t conwq;
+	struct completion discon;
+	wait_queue_head_t sendwq;
+	wait_queue_head_t recvwq;
+	struct mutex sendlock;
+	struct mutex recvlock;
+	struct list_head list;
+	struct list_head li_accept;
+	int acceptcnt;
+	struct list_head liacceptlist;
+	struct list_head miacceptlist;
+	struct scif_endpt *listenep;
+	struct scif_port_id conn_port;
+	int conn_err;
+	int conn_async_state;
+	wait_queue_head_t conn_pend_wq;
+	struct list_head conn_list;
+	struct scif_endpt_rma_info rma_info;
+	struct list_head mmu_list;
+	struct file *anon;
+};
+
+static inline int scifdev_alive(struct scif_endpt *ep)
+{
+	return _scifdev_alive(ep->remote_dev);
+}
+
+/*
+ * scif_verify_epd:
+ * ep: SCIF endpoint
+ *
+ * Checks several generic error conditions and returns the
+ * appropriate error.
+ */
+static inline int scif_verify_epd(struct scif_endpt *ep)
+{
+	if (ep->state == SCIFEP_DISCONNECTED)
+		return -ECONNRESET;
+
+	if (ep->state != SCIFEP_CONNECTED)
+		return -ENOTCONN;
+
+	if (!scifdev_alive(ep))
+		return -ENODEV;
+
+	return 0;
+}
+
+static inline int scif_anon_inode_getfile(scif_epd_t epd)
+{
+	epd->anon = anon_inode_getfile("scif", &scif_anon_fops, NULL, 0);
+	if (IS_ERR(epd->anon))
+		return PTR_ERR(epd->anon);
+	return 0;
+}
+
+static inline void scif_anon_inode_fput(scif_epd_t epd)
+{
+	if (epd->anon) {
+		fput(epd->anon);
+		epd->anon = NULL;
+	}
+}
+
+void scif_cleanup_zombie_epd(void);
+void scif_teardown_ep(void *endpt);
+void scif_cleanup_ep_qp(struct scif_endpt *ep);
+void scif_add_epd_to_zombie_list(struct scif_endpt *ep, bool eplock_held);
+void scif_get_node_info(void);
+void scif_send_acks(struct scif_dev *dev);
+void scif_conn_handler(struct work_struct *work);
+int scif_rsrv_port(u16 port);
+void scif_get_port(u16 port);
+int scif_get_new_port(void);
+void scif_put_port(u16 port);
+int scif_user_send(scif_epd_t epd, void __user *msg, int len, int flags);
+int scif_user_recv(scif_epd_t epd, void __user *msg, int len, int flags);
+void scif_cnctreq(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_cnctgnt(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_cnctgnt_ack(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_cnctgnt_nack(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_cnctrej(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_discnct(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_discnt_ack(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_clientsend(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_clientrcvd(struct scif_dev *scifdev, struct scifmsg *msg);
+int __scif_connect(scif_epd_t epd, struct scif_port_id *dst, bool non_block);
+int __scif_flush(scif_epd_t epd);
+int scif_mmap(struct vm_area_struct *vma, scif_epd_t epd);
+__poll_t __scif_pollfd(struct file *f, poll_table *wait,
+			   struct scif_endpt *ep);
+int __scif_pin_pages(void *addr, size_t len, int *out_prot,
+		     int map_flags, scif_pinned_pages_t *pages);
+#endif /* SCIF_EPD_H */
diff --git a/drivers/misc/mic/scif/scif_fd.c b/drivers/misc/mic/scif/scif_fd.c
new file mode 100644
index 000000000..5c2a57ae4
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_fd.c
@@ -0,0 +1,471 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include "scif_main.h"
+
+static int scif_fdopen(struct inode *inode, struct file *f)
+{
+	struct scif_endpt *priv = scif_open();
+
+	if (!priv)
+		return -ENOMEM;
+	f->private_data = priv;
+	return 0;
+}
+
+static int scif_fdclose(struct inode *inode, struct file *f)
+{
+	struct scif_endpt *priv = f->private_data;
+
+	return scif_close(priv);
+}
+
+static int scif_fdmmap(struct file *f, struct vm_area_struct *vma)
+{
+	struct scif_endpt *priv = f->private_data;
+
+	return scif_mmap(vma, priv);
+}
+
+static __poll_t scif_fdpoll(struct file *f, poll_table *wait)
+{
+	struct scif_endpt *priv = f->private_data;
+
+	return __scif_pollfd(f, wait, priv);
+}
+
+static int scif_fdflush(struct file *f, fl_owner_t id)
+{
+	struct scif_endpt *ep = f->private_data;
+
+	spin_lock(&ep->lock);
+	/*
+	 * The listening endpoint stashes the open file information before
+	 * waiting for incoming connections. The release callback would never be
+	 * called if the application closed the endpoint, while waiting for
+	 * incoming connections from a separate thread since the file descriptor
+	 * reference count is bumped up in the accept IOCTL. Call the flush
+	 * routine if the id matches the endpoint open file information so that
+	 * the listening endpoint can be woken up and the fd released.
+	 */
+	if (ep->files == id)
+		__scif_flush(ep);
+	spin_unlock(&ep->lock);
+	return 0;
+}
+
+static __always_inline void scif_err_debug(int err, const char *str)
+{
+	/*
+	 * ENOTCONN is a common uninteresting error which is
+	 * flooding debug messages to the console unnecessarily.
+	 */
+	if (err < 0 && err != -ENOTCONN)
+		dev_dbg(scif_info.mdev.this_device, "%s err %d\n", str, err);
+}
+
+static long scif_fdioctl(struct file *f, unsigned int cmd, unsigned long arg)
+{
+	struct scif_endpt *priv = f->private_data;
+	void __user *argp = (void __user *)arg;
+	int err = 0;
+	struct scifioctl_msg request;
+	bool non_block = false;
+
+	non_block = !!(f->f_flags & O_NONBLOCK);
+
+	switch (cmd) {
+	case SCIF_BIND:
+	{
+		int pn;
+
+		if (copy_from_user(&pn, argp, sizeof(pn)))
+			return -EFAULT;
+
+		pn = scif_bind(priv, pn);
+		if (pn < 0)
+			return pn;
+
+		if (copy_to_user(argp, &pn, sizeof(pn)))
+			return -EFAULT;
+
+		return 0;
+	}
+	case SCIF_LISTEN:
+		return scif_listen(priv, arg);
+	case SCIF_CONNECT:
+	{
+		struct scifioctl_connect req;
+		struct scif_endpt *ep = (struct scif_endpt *)priv;
+
+		if (copy_from_user(&req, argp, sizeof(req)))
+			return -EFAULT;
+
+		err = __scif_connect(priv, &req.peer, non_block);
+		if (err < 0)
+			return err;
+
+		req.self.node = ep->port.node;
+		req.self.port = ep->port.port;
+
+		if (copy_to_user(argp, &req, sizeof(req)))
+			return -EFAULT;
+
+		return 0;
+	}
+	/*
+	 * Accept is done in two halves.  The request ioctl does the basic
+	 * functionality of accepting the request and returning the information
+	 * about it including the internal ID of the end point.  The register
+	 * is done with the internal ID on a new file descriptor opened by the
+	 * requesting process.
+	 */
+	case SCIF_ACCEPTREQ:
+	{
+		struct scifioctl_accept request;
+		scif_epd_t *ep = (scif_epd_t *)&request.endpt;
+
+		if (copy_from_user(&request, argp, sizeof(request)))
+			return -EFAULT;
+
+		err = scif_accept(priv, &request.peer, ep, request.flags);
+		if (err < 0)
+			return err;
+
+		if (copy_to_user(argp, &request, sizeof(request))) {
+			scif_close(*ep);
+			return -EFAULT;
+		}
+		/*
+		 * Add to the list of user mode eps where the second half
+		 * of the accept is not yet completed.
+		 */
+		mutex_lock(&scif_info.eplock);
+		list_add_tail(&((*ep)->miacceptlist), &scif_info.uaccept);
+		list_add_tail(&((*ep)->liacceptlist), &priv->li_accept);
+		(*ep)->listenep = priv;
+		priv->acceptcnt++;
+		mutex_unlock(&scif_info.eplock);
+
+		return 0;
+	}
+	case SCIF_ACCEPTREG:
+	{
+		struct scif_endpt *priv = f->private_data;
+		struct scif_endpt *newep;
+		struct scif_endpt *lisep;
+		struct scif_endpt *fep = NULL;
+		struct scif_endpt *tmpep;
+		struct list_head *pos, *tmpq;
+
+		/* Finally replace the pointer to the accepted endpoint */
+		if (copy_from_user(&newep, argp, sizeof(void *)))
+			return -EFAULT;
+
+		/* Remove form the user accept queue */
+		mutex_lock(&scif_info.eplock);
+		list_for_each_safe(pos, tmpq, &scif_info.uaccept) {
+			tmpep = list_entry(pos,
+					   struct scif_endpt, miacceptlist);
+			if (tmpep == newep) {
+				list_del(pos);
+				fep = tmpep;
+				break;
+			}
+		}
+
+		if (!fep) {
+			mutex_unlock(&scif_info.eplock);
+			return -ENOENT;
+		}
+
+		lisep = newep->listenep;
+		list_for_each_safe(pos, tmpq, &lisep->li_accept) {
+			tmpep = list_entry(pos,
+					   struct scif_endpt, liacceptlist);
+			if (tmpep == newep) {
+				list_del(pos);
+				lisep->acceptcnt--;
+				break;
+			}
+		}
+
+		mutex_unlock(&scif_info.eplock);
+
+		/* Free the resources automatically created from the open. */
+		scif_anon_inode_fput(priv);
+		scif_teardown_ep(priv);
+		scif_add_epd_to_zombie_list(priv, !SCIF_EPLOCK_HELD);
+		f->private_data = newep;
+		return 0;
+	}
+	case SCIF_SEND:
+	{
+		struct scif_endpt *priv = f->private_data;
+
+		if (copy_from_user(&request, argp,
+				   sizeof(struct scifioctl_msg))) {
+			err = -EFAULT;
+			goto send_err;
+		}
+		err = scif_user_send(priv, (void __user *)request.msg,
+				     request.len, request.flags);
+		if (err < 0)
+			goto send_err;
+		if (copy_to_user(&
+				 ((struct scifioctl_msg __user *)argp)->out_len,
+				 &err, sizeof(err))) {
+			err = -EFAULT;
+			goto send_err;
+		}
+		err = 0;
+send_err:
+		scif_err_debug(err, "scif_send");
+		return err;
+	}
+	case SCIF_RECV:
+	{
+		struct scif_endpt *priv = f->private_data;
+
+		if (copy_from_user(&request, argp,
+				   sizeof(struct scifioctl_msg))) {
+			err = -EFAULT;
+			goto recv_err;
+		}
+
+		err = scif_user_recv(priv, (void __user *)request.msg,
+				     request.len, request.flags);
+		if (err < 0)
+			goto recv_err;
+
+		if (copy_to_user(&
+				 ((struct scifioctl_msg __user *)argp)->out_len,
+			&err, sizeof(err))) {
+			err = -EFAULT;
+			goto recv_err;
+		}
+		err = 0;
+recv_err:
+		scif_err_debug(err, "scif_recv");
+		return err;
+	}
+	case SCIF_GET_NODEIDS:
+	{
+		struct scifioctl_node_ids node_ids;
+		int entries;
+		u16 *nodes;
+		void __user *unodes, *uself;
+		u16 self;
+
+		if (copy_from_user(&node_ids, argp, sizeof(node_ids))) {
+			err = -EFAULT;
+			goto getnodes_err2;
+		}
+
+		entries = min_t(int, scif_info.maxid, node_ids.len);
+		nodes = kmalloc_array(entries, sizeof(u16), GFP_KERNEL);
+		if (entries && !nodes) {
+			err = -ENOMEM;
+			goto getnodes_err2;
+		}
+		node_ids.len = scif_get_node_ids(nodes, entries, &self);
+
+		unodes = (void __user *)node_ids.nodes;
+		if (copy_to_user(unodes, nodes, sizeof(u16) * entries)) {
+			err = -EFAULT;
+			goto getnodes_err1;
+		}
+
+		uself = (void __user *)node_ids.self;
+		if (copy_to_user(uself, &self, sizeof(u16))) {
+			err = -EFAULT;
+			goto getnodes_err1;
+		}
+
+		if (copy_to_user(argp, &node_ids, sizeof(node_ids))) {
+			err = -EFAULT;
+			goto getnodes_err1;
+		}
+getnodes_err1:
+		kfree(nodes);
+getnodes_err2:
+		return err;
+	}
+	case SCIF_REG:
+	{
+		struct scif_endpt *priv = f->private_data;
+		struct scifioctl_reg reg;
+		off_t ret;
+
+		if (copy_from_user(&reg, argp, sizeof(reg))) {
+			err = -EFAULT;
+			goto reg_err;
+		}
+		if (reg.flags & SCIF_MAP_KERNEL) {
+			err = -EINVAL;
+			goto reg_err;
+		}
+		ret = scif_register(priv, (void *)reg.addr, reg.len,
+				    reg.offset, reg.prot, reg.flags);
+		if (ret < 0) {
+			err = (int)ret;
+			goto reg_err;
+		}
+
+		if (copy_to_user(&((struct scifioctl_reg __user *)argp)
+				 ->out_offset, &ret, sizeof(reg.out_offset))) {
+			err = -EFAULT;
+			goto reg_err;
+		}
+		err = 0;
+reg_err:
+		scif_err_debug(err, "scif_register");
+		return err;
+	}
+	case SCIF_UNREG:
+	{
+		struct scif_endpt *priv = f->private_data;
+		struct scifioctl_unreg unreg;
+
+		if (copy_from_user(&unreg, argp, sizeof(unreg))) {
+			err = -EFAULT;
+			goto unreg_err;
+		}
+		err = scif_unregister(priv, unreg.offset, unreg.len);
+unreg_err:
+		scif_err_debug(err, "scif_unregister");
+		return err;
+	}
+	case SCIF_READFROM:
+	{
+		struct scif_endpt *priv = f->private_data;
+		struct scifioctl_copy copy;
+
+		if (copy_from_user(&copy, argp, sizeof(copy))) {
+			err = -EFAULT;
+			goto readfrom_err;
+		}
+		err = scif_readfrom(priv, copy.loffset, copy.len, copy.roffset,
+				    copy.flags);
+readfrom_err:
+		scif_err_debug(err, "scif_readfrom");
+		return err;
+	}
+	case SCIF_WRITETO:
+	{
+		struct scif_endpt *priv = f->private_data;
+		struct scifioctl_copy copy;
+
+		if (copy_from_user(&copy, argp, sizeof(copy))) {
+			err = -EFAULT;
+			goto writeto_err;
+		}
+		err = scif_writeto(priv, copy.loffset, copy.len, copy.roffset,
+				   copy.flags);
+writeto_err:
+		scif_err_debug(err, "scif_writeto");
+		return err;
+	}
+	case SCIF_VREADFROM:
+	{
+		struct scif_endpt *priv = f->private_data;
+		struct scifioctl_copy copy;
+
+		if (copy_from_user(&copy, argp, sizeof(copy))) {
+			err = -EFAULT;
+			goto vreadfrom_err;
+		}
+		err = scif_vreadfrom(priv, (void __force *)copy.addr, copy.len,
+				     copy.roffset, copy.flags);
+vreadfrom_err:
+		scif_err_debug(err, "scif_vreadfrom");
+		return err;
+	}
+	case SCIF_VWRITETO:
+	{
+		struct scif_endpt *priv = f->private_data;
+		struct scifioctl_copy copy;
+
+		if (copy_from_user(&copy, argp, sizeof(copy))) {
+			err = -EFAULT;
+			goto vwriteto_err;
+		}
+		err = scif_vwriteto(priv, (void __force *)copy.addr, copy.len,
+				    copy.roffset, copy.flags);
+vwriteto_err:
+		scif_err_debug(err, "scif_vwriteto");
+		return err;
+	}
+	case SCIF_FENCE_MARK:
+	{
+		struct scif_endpt *priv = f->private_data;
+		struct scifioctl_fence_mark mark;
+		int tmp_mark = 0;
+
+		if (copy_from_user(&mark, argp, sizeof(mark))) {
+			err = -EFAULT;
+			goto fence_mark_err;
+		}
+		err = scif_fence_mark(priv, mark.flags, &tmp_mark);
+		if (err)
+			goto fence_mark_err;
+		if (copy_to_user((void __user *)mark.mark, &tmp_mark,
+				 sizeof(tmp_mark))) {
+			err = -EFAULT;
+			goto fence_mark_err;
+		}
+fence_mark_err:
+		scif_err_debug(err, "scif_fence_mark");
+		return err;
+	}
+	case SCIF_FENCE_WAIT:
+	{
+		struct scif_endpt *priv = f->private_data;
+
+		err = scif_fence_wait(priv, arg);
+		scif_err_debug(err, "scif_fence_wait");
+		return err;
+	}
+	case SCIF_FENCE_SIGNAL:
+	{
+		struct scif_endpt *priv = f->private_data;
+		struct scifioctl_fence_signal signal;
+
+		if (copy_from_user(&signal, argp, sizeof(signal))) {
+			err = -EFAULT;
+			goto fence_signal_err;
+		}
+
+		err = scif_fence_signal(priv, signal.loff, signal.lval,
+					signal.roff, signal.rval, signal.flags);
+fence_signal_err:
+		scif_err_debug(err, "scif_fence_signal");
+		return err;
+	}
+	}
+	return -EINVAL;
+}
+
+const struct file_operations scif_fops = {
+	.open = scif_fdopen,
+	.release = scif_fdclose,
+	.unlocked_ioctl = scif_fdioctl,
+	.mmap = scif_fdmmap,
+	.poll = scif_fdpoll,
+	.flush = scif_fdflush,
+	.owner = THIS_MODULE,
+};
diff --git a/drivers/misc/mic/scif/scif_fence.c b/drivers/misc/mic/scif/scif_fence.c
new file mode 100644
index 000000000..7bb929f05
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_fence.c
@@ -0,0 +1,772 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+
+#include "scif_main.h"
+
+/**
+ * scif_recv_mark: Handle SCIF_MARK request
+ * @msg:	Interrupt message
+ *
+ * The peer has requested a mark.
+ */
+void scif_recv_mark(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+	int mark = 0;
+	int err;
+
+	err = _scif_fence_mark(ep, &mark);
+	if (err)
+		msg->uop = SCIF_MARK_NACK;
+	else
+		msg->uop = SCIF_MARK_ACK;
+	msg->payload[0] = ep->remote_ep;
+	msg->payload[2] = mark;
+	scif_nodeqp_send(ep->remote_dev, msg);
+}
+
+/**
+ * scif_recv_mark_resp: Handle SCIF_MARK_(N)ACK messages.
+ * @msg:	Interrupt message
+ *
+ * The peer has responded to a SCIF_MARK message.
+ */
+void scif_recv_mark_resp(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+	struct scif_fence_info *fence_req =
+		(struct scif_fence_info *)msg->payload[1];
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	if (msg->uop == SCIF_MARK_ACK) {
+		fence_req->state = OP_COMPLETED;
+		fence_req->dma_mark = (int)msg->payload[2];
+	} else {
+		fence_req->state = OP_FAILED;
+	}
+	mutex_unlock(&ep->rma_info.rma_lock);
+	complete(&fence_req->comp);
+}
+
+/**
+ * scif_recv_wait: Handle SCIF_WAIT request
+ * @msg:	Interrupt message
+ *
+ * The peer has requested waiting on a fence.
+ */
+void scif_recv_wait(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+	struct scif_remote_fence_info *fence;
+
+	/*
+	 * Allocate structure for remote fence information and
+	 * send a NACK if the allocation failed. The peer will
+	 * return ENOMEM upon receiving a NACK.
+	 */
+	fence = kmalloc(sizeof(*fence), GFP_KERNEL);
+	if (!fence) {
+		msg->payload[0] = ep->remote_ep;
+		msg->uop = SCIF_WAIT_NACK;
+		scif_nodeqp_send(ep->remote_dev, msg);
+		return;
+	}
+
+	/* Prepare the fence request */
+	memcpy(&fence->msg, msg, sizeof(struct scifmsg));
+	INIT_LIST_HEAD(&fence->list);
+
+	/* Insert to the global remote fence request list */
+	mutex_lock(&scif_info.fencelock);
+	atomic_inc(&ep->rma_info.fence_refcount);
+	list_add_tail(&fence->list, &scif_info.fence);
+	mutex_unlock(&scif_info.fencelock);
+
+	schedule_work(&scif_info.misc_work);
+}
+
+/**
+ * scif_recv_wait_resp: Handle SCIF_WAIT_(N)ACK messages.
+ * @msg:	Interrupt message
+ *
+ * The peer has responded to a SCIF_WAIT message.
+ */
+void scif_recv_wait_resp(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+	struct scif_fence_info *fence_req =
+		(struct scif_fence_info *)msg->payload[1];
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	if (msg->uop == SCIF_WAIT_ACK)
+		fence_req->state = OP_COMPLETED;
+	else
+		fence_req->state = OP_FAILED;
+	mutex_unlock(&ep->rma_info.rma_lock);
+	complete(&fence_req->comp);
+}
+
+/**
+ * scif_recv_sig_local: Handle SCIF_SIG_LOCAL request
+ * @msg:	Interrupt message
+ *
+ * The peer has requested a signal on a local offset.
+ */
+void scif_recv_sig_local(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+	int err;
+
+	err = scif_prog_signal(ep, msg->payload[1], msg->payload[2],
+			       SCIF_WINDOW_SELF);
+	if (err)
+		msg->uop = SCIF_SIG_NACK;
+	else
+		msg->uop = SCIF_SIG_ACK;
+	msg->payload[0] = ep->remote_ep;
+	scif_nodeqp_send(ep->remote_dev, msg);
+}
+
+/**
+ * scif_recv_sig_remote: Handle SCIF_SIGNAL_REMOTE request
+ * @msg:	Interrupt message
+ *
+ * The peer has requested a signal on a remote offset.
+ */
+void scif_recv_sig_remote(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+	int err;
+
+	err = scif_prog_signal(ep, msg->payload[1], msg->payload[2],
+			       SCIF_WINDOW_PEER);
+	if (err)
+		msg->uop = SCIF_SIG_NACK;
+	else
+		msg->uop = SCIF_SIG_ACK;
+	msg->payload[0] = ep->remote_ep;
+	scif_nodeqp_send(ep->remote_dev, msg);
+}
+
+/**
+ * scif_recv_sig_resp: Handle SCIF_SIG_(N)ACK messages.
+ * @msg:	Interrupt message
+ *
+ * The peer has responded to a signal request.
+ */
+void scif_recv_sig_resp(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+	struct scif_fence_info *fence_req =
+		(struct scif_fence_info *)msg->payload[3];
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	if (msg->uop == SCIF_SIG_ACK)
+		fence_req->state = OP_COMPLETED;
+	else
+		fence_req->state = OP_FAILED;
+	mutex_unlock(&ep->rma_info.rma_lock);
+	complete(&fence_req->comp);
+}
+
+static inline void *scif_get_local_va(off_t off, struct scif_window *window)
+{
+	struct page **pages = window->pinned_pages->pages;
+	int page_nr = (off - window->offset) >> PAGE_SHIFT;
+	off_t page_off = off & ~PAGE_MASK;
+
+	return page_address(pages[page_nr]) + page_off;
+}
+
+static void scif_prog_signal_cb(void *arg)
+{
+	struct scif_status *status = arg;
+
+	dma_pool_free(status->ep->remote_dev->signal_pool, status,
+		      status->src_dma_addr);
+}
+
+static int _scif_prog_signal(scif_epd_t epd, dma_addr_t dst, u64 val)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	struct dma_chan *chan = ep->rma_info.dma_chan;
+	struct dma_device *ddev = chan->device;
+	bool x100 = !is_dma_copy_aligned(chan->device, 1, 1, 1);
+	struct dma_async_tx_descriptor *tx;
+	struct scif_status *status = NULL;
+	dma_addr_t src;
+	dma_cookie_t cookie;
+	int err;
+
+	tx = ddev->device_prep_dma_memcpy(chan, 0, 0, 0, DMA_PREP_FENCE);
+	if (!tx) {
+		err = -ENOMEM;
+		dev_err(&ep->remote_dev->sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		goto alloc_fail;
+	}
+	cookie = tx->tx_submit(tx);
+	if (dma_submit_error(cookie)) {
+		err = (int)cookie;
+		dev_err(&ep->remote_dev->sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		goto alloc_fail;
+	}
+	dma_async_issue_pending(chan);
+	if (x100) {
+		/*
+		 * For X100 use the status descriptor to write the value to
+		 * the destination.
+		 */
+		tx = ddev->device_prep_dma_imm_data(chan, dst, val, 0);
+	} else {
+		status = dma_pool_alloc(ep->remote_dev->signal_pool, GFP_KERNEL,
+					&src);
+		if (!status) {
+			err = -ENOMEM;
+			dev_err(&ep->remote_dev->sdev->dev, "%s %d err %d\n",
+				__func__, __LINE__, err);
+			goto alloc_fail;
+		}
+		status->val = val;
+		status->src_dma_addr = src;
+		status->ep = ep;
+		src += offsetof(struct scif_status, val);
+		tx = ddev->device_prep_dma_memcpy(chan, dst, src, sizeof(val),
+						  DMA_PREP_INTERRUPT);
+	}
+	if (!tx) {
+		err = -ENOMEM;
+		dev_err(&ep->remote_dev->sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		goto dma_fail;
+	}
+	if (!x100) {
+		tx->callback = scif_prog_signal_cb;
+		tx->callback_param = status;
+	}
+	cookie = tx->tx_submit(tx);
+	if (dma_submit_error(cookie)) {
+		err = -EIO;
+		dev_err(&ep->remote_dev->sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		goto dma_fail;
+	}
+	dma_async_issue_pending(chan);
+	return 0;
+dma_fail:
+	if (!x100)
+		dma_pool_free(ep->remote_dev->signal_pool, status,
+			      src - offsetof(struct scif_status, val));
+alloc_fail:
+	return err;
+}
+
+/*
+ * scif_prog_signal:
+ * @epd - Endpoint Descriptor
+ * @offset - registered address to write @val to
+ * @val - Value to be written at @offset
+ * @type - Type of the window.
+ *
+ * Arrange to write a value to the registered offset after ensuring that the
+ * offset provided is indeed valid.
+ */
+int scif_prog_signal(scif_epd_t epd, off_t offset, u64 val,
+		     enum scif_window_type type)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	struct scif_window *window = NULL;
+	struct scif_rma_req req;
+	dma_addr_t dst_dma_addr;
+	int err;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	req.out_window = &window;
+	req.offset = offset;
+	req.nr_bytes = sizeof(u64);
+	req.prot = SCIF_PROT_WRITE;
+	req.type = SCIF_WINDOW_SINGLE;
+	if (type == SCIF_WINDOW_SELF)
+		req.head = &ep->rma_info.reg_list;
+	else
+		req.head = &ep->rma_info.remote_reg_list;
+	/* Does a valid window exist? */
+	err = scif_query_window(&req);
+	if (err) {
+		dev_err(scif_info.mdev.this_device,
+			"%s %d err %d\n", __func__, __LINE__, err);
+		goto unlock_ret;
+	}
+
+	if (scif_is_mgmt_node() && scifdev_self(ep->remote_dev)) {
+		u64 *dst_virt;
+
+		if (type == SCIF_WINDOW_SELF)
+			dst_virt = scif_get_local_va(offset, window);
+		else
+			dst_virt =
+			scif_get_local_va(offset, (struct scif_window *)
+					  window->peer_window);
+		*dst_virt = val;
+	} else {
+		dst_dma_addr = __scif_off_to_dma_addr(window, offset);
+		err = _scif_prog_signal(epd, dst_dma_addr, val);
+	}
+unlock_ret:
+	mutex_unlock(&ep->rma_info.rma_lock);
+	return err;
+}
+
+static int _scif_fence_wait(scif_epd_t epd, int mark)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	dma_cookie_t cookie = mark & ~SCIF_REMOTE_FENCE;
+	int err;
+
+	/* Wait for DMA callback in scif_fence_mark_cb(..) */
+	err = wait_event_interruptible_timeout(ep->rma_info.markwq,
+					       dma_async_is_tx_complete(
+					       ep->rma_info.dma_chan,
+					       cookie, NULL, NULL) ==
+					       DMA_COMPLETE,
+					       SCIF_NODE_ALIVE_TIMEOUT);
+	if (!err)
+		err = -ETIMEDOUT;
+	else if (err > 0)
+		err = 0;
+	return err;
+}
+
+/**
+ * scif_rma_handle_remote_fences:
+ *
+ * This routine services remote fence requests.
+ */
+void scif_rma_handle_remote_fences(void)
+{
+	struct list_head *item, *tmp;
+	struct scif_remote_fence_info *fence;
+	struct scif_endpt *ep;
+	int mark, err;
+
+	might_sleep();
+	mutex_lock(&scif_info.fencelock);
+	list_for_each_safe(item, tmp, &scif_info.fence) {
+		fence = list_entry(item, struct scif_remote_fence_info,
+				   list);
+		/* Remove fence from global list */
+		list_del(&fence->list);
+
+		/* Initiate the fence operation */
+		ep = (struct scif_endpt *)fence->msg.payload[0];
+		mark = fence->msg.payload[2];
+		err = _scif_fence_wait(ep, mark);
+		if (err)
+			fence->msg.uop = SCIF_WAIT_NACK;
+		else
+			fence->msg.uop = SCIF_WAIT_ACK;
+		fence->msg.payload[0] = ep->remote_ep;
+		scif_nodeqp_send(ep->remote_dev, &fence->msg);
+		kfree(fence);
+		if (!atomic_sub_return(1, &ep->rma_info.fence_refcount))
+			schedule_work(&scif_info.misc_work);
+	}
+	mutex_unlock(&scif_info.fencelock);
+}
+
+static int _scif_send_fence(scif_epd_t epd, int uop, int mark, int *out_mark)
+{
+	int err;
+	struct scifmsg msg;
+	struct scif_fence_info *fence_req;
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+
+	fence_req = kmalloc(sizeof(*fence_req), GFP_KERNEL);
+	if (!fence_req) {
+		err = -ENOMEM;
+		goto error;
+	}
+
+	fence_req->state = OP_IN_PROGRESS;
+	init_completion(&fence_req->comp);
+
+	msg.src = ep->port;
+	msg.uop = uop;
+	msg.payload[0] = ep->remote_ep;
+	msg.payload[1] = (u64)fence_req;
+	if (uop == SCIF_WAIT)
+		msg.payload[2] = mark;
+	spin_lock(&ep->lock);
+	if (ep->state == SCIFEP_CONNECTED)
+		err = scif_nodeqp_send(ep->remote_dev, &msg);
+	else
+		err = -ENOTCONN;
+	spin_unlock(&ep->lock);
+	if (err)
+		goto error_free;
+retry:
+	/* Wait for a SCIF_WAIT_(N)ACK message */
+	err = wait_for_completion_timeout(&fence_req->comp,
+					  SCIF_NODE_ALIVE_TIMEOUT);
+	if (!err && scifdev_alive(ep))
+		goto retry;
+	if (!err)
+		err = -ENODEV;
+	if (err > 0)
+		err = 0;
+	mutex_lock(&ep->rma_info.rma_lock);
+	if (err < 0) {
+		if (fence_req->state == OP_IN_PROGRESS)
+			fence_req->state = OP_FAILED;
+	}
+	if (fence_req->state == OP_FAILED && !err)
+		err = -ENOMEM;
+	if (uop == SCIF_MARK && fence_req->state == OP_COMPLETED)
+		*out_mark = SCIF_REMOTE_FENCE | fence_req->dma_mark;
+	mutex_unlock(&ep->rma_info.rma_lock);
+error_free:
+	kfree(fence_req);
+error:
+	return err;
+}
+
+/**
+ * scif_send_fence_mark:
+ * @epd: end point descriptor.
+ * @out_mark: Output DMA mark reported by peer.
+ *
+ * Send a remote fence mark request.
+ */
+static int scif_send_fence_mark(scif_epd_t epd, int *out_mark)
+{
+	return _scif_send_fence(epd, SCIF_MARK, 0, out_mark);
+}
+
+/**
+ * scif_send_fence_wait:
+ * @epd: end point descriptor.
+ * @mark: DMA mark to wait for.
+ *
+ * Send a remote fence wait request.
+ */
+static int scif_send_fence_wait(scif_epd_t epd, int mark)
+{
+	return _scif_send_fence(epd, SCIF_WAIT, mark, NULL);
+}
+
+static int _scif_send_fence_signal_wait(struct scif_endpt *ep,
+					struct scif_fence_info *fence_req)
+{
+	int err;
+
+retry:
+	/* Wait for a SCIF_SIG_(N)ACK message */
+	err = wait_for_completion_timeout(&fence_req->comp,
+					  SCIF_NODE_ALIVE_TIMEOUT);
+	if (!err && scifdev_alive(ep))
+		goto retry;
+	if (!err)
+		err = -ENODEV;
+	if (err > 0)
+		err = 0;
+	if (err < 0) {
+		mutex_lock(&ep->rma_info.rma_lock);
+		if (fence_req->state == OP_IN_PROGRESS)
+			fence_req->state = OP_FAILED;
+		mutex_unlock(&ep->rma_info.rma_lock);
+	}
+	if (fence_req->state == OP_FAILED && !err)
+		err = -ENXIO;
+	return err;
+}
+
+/**
+ * scif_send_fence_signal:
+ * @epd - endpoint descriptor
+ * @loff - local offset
+ * @lval - local value to write to loffset
+ * @roff - remote offset
+ * @rval - remote value to write to roffset
+ * @flags - flags
+ *
+ * Sends a remote fence signal request
+ */
+static int scif_send_fence_signal(scif_epd_t epd, off_t roff, u64 rval,
+				  off_t loff, u64 lval, int flags)
+{
+	int err = 0;
+	struct scifmsg msg;
+	struct scif_fence_info *fence_req;
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+
+	fence_req = kmalloc(sizeof(*fence_req), GFP_KERNEL);
+	if (!fence_req) {
+		err = -ENOMEM;
+		goto error;
+	}
+
+	fence_req->state = OP_IN_PROGRESS;
+	init_completion(&fence_req->comp);
+	msg.src = ep->port;
+	if (flags & SCIF_SIGNAL_LOCAL) {
+		msg.uop = SCIF_SIG_LOCAL;
+		msg.payload[0] = ep->remote_ep;
+		msg.payload[1] = roff;
+		msg.payload[2] = rval;
+		msg.payload[3] = (u64)fence_req;
+		spin_lock(&ep->lock);
+		if (ep->state == SCIFEP_CONNECTED)
+			err = scif_nodeqp_send(ep->remote_dev, &msg);
+		else
+			err = -ENOTCONN;
+		spin_unlock(&ep->lock);
+		if (err)
+			goto error_free;
+		err = _scif_send_fence_signal_wait(ep, fence_req);
+		if (err)
+			goto error_free;
+	}
+	fence_req->state = OP_IN_PROGRESS;
+
+	if (flags & SCIF_SIGNAL_REMOTE) {
+		msg.uop = SCIF_SIG_REMOTE;
+		msg.payload[0] = ep->remote_ep;
+		msg.payload[1] = loff;
+		msg.payload[2] = lval;
+		msg.payload[3] = (u64)fence_req;
+		spin_lock(&ep->lock);
+		if (ep->state == SCIFEP_CONNECTED)
+			err = scif_nodeqp_send(ep->remote_dev, &msg);
+		else
+			err = -ENOTCONN;
+		spin_unlock(&ep->lock);
+		if (err)
+			goto error_free;
+		err = _scif_send_fence_signal_wait(ep, fence_req);
+	}
+error_free:
+	kfree(fence_req);
+error:
+	return err;
+}
+
+static void scif_fence_mark_cb(void *arg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)arg;
+
+	wake_up_interruptible(&ep->rma_info.markwq);
+	atomic_dec(&ep->rma_info.fence_refcount);
+}
+
+/*
+ * _scif_fence_mark:
+ *
+ * @epd - endpoint descriptor
+ * Set up a mark for this endpoint and return the value of the mark.
+ */
+int _scif_fence_mark(scif_epd_t epd, int *mark)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	struct dma_chan *chan = ep->rma_info.dma_chan;
+	struct dma_device *ddev = chan->device;
+	struct dma_async_tx_descriptor *tx;
+	dma_cookie_t cookie;
+	int err;
+
+	tx = ddev->device_prep_dma_memcpy(chan, 0, 0, 0, DMA_PREP_FENCE);
+	if (!tx) {
+		err = -ENOMEM;
+		dev_err(&ep->remote_dev->sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		return err;
+	}
+	cookie = tx->tx_submit(tx);
+	if (dma_submit_error(cookie)) {
+		err = (int)cookie;
+		dev_err(&ep->remote_dev->sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		return err;
+	}
+	dma_async_issue_pending(chan);
+	tx = ddev->device_prep_dma_interrupt(chan, DMA_PREP_INTERRUPT);
+	if (!tx) {
+		err = -ENOMEM;
+		dev_err(&ep->remote_dev->sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		return err;
+	}
+	tx->callback = scif_fence_mark_cb;
+	tx->callback_param = ep;
+	*mark = cookie = tx->tx_submit(tx);
+	if (dma_submit_error(cookie)) {
+		err = (int)cookie;
+		dev_err(&ep->remote_dev->sdev->dev, "%s %d err %d\n",
+			__func__, __LINE__, err);
+		return err;
+	}
+	atomic_inc(&ep->rma_info.fence_refcount);
+	dma_async_issue_pending(chan);
+	return 0;
+}
+
+#define SCIF_LOOPB_MAGIC_MARK 0xdead
+
+int scif_fence_mark(scif_epd_t epd, int flags, int *mark)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	int err = 0;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI fence_mark: ep %p flags 0x%x mark 0x%x\n",
+		ep, flags, *mark);
+	err = scif_verify_epd(ep);
+	if (err)
+		return err;
+
+	/* Invalid flags? */
+	if (flags & ~(SCIF_FENCE_INIT_SELF | SCIF_FENCE_INIT_PEER))
+		return -EINVAL;
+
+	/* At least one of init self or peer RMA should be set */
+	if (!(flags & (SCIF_FENCE_INIT_SELF | SCIF_FENCE_INIT_PEER)))
+		return -EINVAL;
+
+	/* Exactly one of init self or peer RMA should be set but not both */
+	if ((flags & SCIF_FENCE_INIT_SELF) && (flags & SCIF_FENCE_INIT_PEER))
+		return -EINVAL;
+
+	/*
+	 * Management node loopback does not need to use DMA.
+	 * Return a valid mark to be symmetric.
+	 */
+	if (scifdev_self(ep->remote_dev) && scif_is_mgmt_node()) {
+		*mark = SCIF_LOOPB_MAGIC_MARK;
+		return 0;
+	}
+
+	if (flags & SCIF_FENCE_INIT_SELF)
+		err = _scif_fence_mark(epd, mark);
+	else
+		err = scif_send_fence_mark(ep, mark);
+
+	if (err)
+		dev_err(scif_info.mdev.this_device,
+			"%s %d err %d\n", __func__, __LINE__, err);
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI fence_mark: ep %p flags 0x%x mark 0x%x err %d\n",
+		ep, flags, *mark, err);
+	return err;
+}
+EXPORT_SYMBOL_GPL(scif_fence_mark);
+
+int scif_fence_wait(scif_epd_t epd, int mark)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	int err = 0;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI fence_wait: ep %p mark 0x%x\n",
+		ep, mark);
+	err = scif_verify_epd(ep);
+	if (err)
+		return err;
+	/*
+	 * Management node loopback does not need to use DMA.
+	 * The only valid mark provided is 0 so simply
+	 * return success if the mark is valid.
+	 */
+	if (scifdev_self(ep->remote_dev) && scif_is_mgmt_node()) {
+		if (mark == SCIF_LOOPB_MAGIC_MARK)
+			return 0;
+		else
+			return -EINVAL;
+	}
+	if (mark & SCIF_REMOTE_FENCE)
+		err = scif_send_fence_wait(epd, mark);
+	else
+		err = _scif_fence_wait(epd, mark);
+	if (err < 0)
+		dev_err(scif_info.mdev.this_device,
+			"%s %d err %d\n", __func__, __LINE__, err);
+	return err;
+}
+EXPORT_SYMBOL_GPL(scif_fence_wait);
+
+int scif_fence_signal(scif_epd_t epd, off_t loff, u64 lval,
+		      off_t roff, u64 rval, int flags)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	int err = 0;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI fence_signal: ep %p loff 0x%lx lval 0x%llx roff 0x%lx rval 0x%llx flags 0x%x\n",
+		ep, loff, lval, roff, rval, flags);
+	err = scif_verify_epd(ep);
+	if (err)
+		return err;
+
+	/* Invalid flags? */
+	if (flags & ~(SCIF_FENCE_INIT_SELF | SCIF_FENCE_INIT_PEER |
+			SCIF_SIGNAL_LOCAL | SCIF_SIGNAL_REMOTE))
+		return -EINVAL;
+
+	/* At least one of init self or peer RMA should be set */
+	if (!(flags & (SCIF_FENCE_INIT_SELF | SCIF_FENCE_INIT_PEER)))
+		return -EINVAL;
+
+	/* Exactly one of init self or peer RMA should be set but not both */
+	if ((flags & SCIF_FENCE_INIT_SELF) && (flags & SCIF_FENCE_INIT_PEER))
+		return -EINVAL;
+
+	/* At least one of SCIF_SIGNAL_LOCAL or SCIF_SIGNAL_REMOTE required */
+	if (!(flags & (SCIF_SIGNAL_LOCAL | SCIF_SIGNAL_REMOTE)))
+		return -EINVAL;
+
+	/* Only Dword offsets allowed */
+	if ((flags & SCIF_SIGNAL_LOCAL) && (loff & (sizeof(u32) - 1)))
+		return -EINVAL;
+
+	/* Only Dword aligned offsets allowed */
+	if ((flags & SCIF_SIGNAL_REMOTE) && (roff & (sizeof(u32) - 1)))
+		return -EINVAL;
+
+	if (flags & SCIF_FENCE_INIT_PEER) {
+		err = scif_send_fence_signal(epd, roff, rval, loff,
+					     lval, flags);
+	} else {
+		/* Local Signal in Local RAS */
+		if (flags & SCIF_SIGNAL_LOCAL) {
+			err = scif_prog_signal(epd, loff, lval,
+					       SCIF_WINDOW_SELF);
+			if (err)
+				goto error_ret;
+		}
+
+		/* Signal in Remote RAS */
+		if (flags & SCIF_SIGNAL_REMOTE)
+			err = scif_prog_signal(epd, roff,
+					       rval, SCIF_WINDOW_PEER);
+	}
+error_ret:
+	if (err)
+		dev_err(scif_info.mdev.this_device,
+			"%s %d err %d\n", __func__, __LINE__, err);
+	return err;
+}
+EXPORT_SYMBOL_GPL(scif_fence_signal);
diff --git a/drivers/misc/mic/scif/scif_main.c b/drivers/misc/mic/scif/scif_main.c
new file mode 100644
index 000000000..36d847af1
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_main.c
@@ -0,0 +1,359 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include <linux/module.h>
+#include <linux/idr.h>
+
+#include <linux/mic_common.h>
+#include "../common/mic_dev.h"
+#include "../bus/scif_bus.h"
+#include "scif_peer_bus.h"
+#include "scif_main.h"
+#include "scif_map.h"
+
+struct scif_info scif_info = {
+	.mdev = {
+		.minor = MISC_DYNAMIC_MINOR,
+		.name = "scif",
+		.fops = &scif_fops,
+	}
+};
+
+struct scif_dev *scif_dev;
+struct kmem_cache *unaligned_cache;
+static atomic_t g_loopb_cnt;
+
+/* Runs in the context of intr_wq */
+static void scif_intr_bh_handler(struct work_struct *work)
+{
+	struct scif_dev *scifdev =
+			container_of(work, struct scif_dev, intr_bh);
+
+	if (scifdev_self(scifdev))
+		scif_loopb_msg_handler(scifdev, scifdev->qpairs);
+	else
+		scif_nodeqp_intrhandler(scifdev, scifdev->qpairs);
+}
+
+int scif_setup_intr_wq(struct scif_dev *scifdev)
+{
+	if (!scifdev->intr_wq) {
+		snprintf(scifdev->intr_wqname, sizeof(scifdev->intr_wqname),
+			 "SCIF INTR %d", scifdev->node);
+		scifdev->intr_wq =
+			alloc_ordered_workqueue(scifdev->intr_wqname, 0);
+		if (!scifdev->intr_wq)
+			return -ENOMEM;
+		INIT_WORK(&scifdev->intr_bh, scif_intr_bh_handler);
+	}
+	return 0;
+}
+
+void scif_destroy_intr_wq(struct scif_dev *scifdev)
+{
+	if (scifdev->intr_wq) {
+		destroy_workqueue(scifdev->intr_wq);
+		scifdev->intr_wq = NULL;
+	}
+}
+
+irqreturn_t scif_intr_handler(int irq, void *data)
+{
+	struct scif_dev *scifdev = data;
+	struct scif_hw_dev *sdev = scifdev->sdev;
+
+	sdev->hw_ops->ack_interrupt(sdev, scifdev->db);
+	queue_work(scifdev->intr_wq, &scifdev->intr_bh);
+	return IRQ_HANDLED;
+}
+
+static void scif_qp_setup_handler(struct work_struct *work)
+{
+	struct scif_dev *scifdev = container_of(work, struct scif_dev,
+						qp_dwork.work);
+	struct scif_hw_dev *sdev = scifdev->sdev;
+	dma_addr_t da = 0;
+	int err;
+
+	if (scif_is_mgmt_node()) {
+		struct mic_bootparam *bp = sdev->dp;
+
+		da = bp->scif_card_dma_addr;
+		scifdev->rdb = bp->h2c_scif_db;
+	} else {
+		struct mic_bootparam __iomem *bp = sdev->rdp;
+
+		da = readq(&bp->scif_host_dma_addr);
+		scifdev->rdb = ioread8(&bp->c2h_scif_db);
+	}
+	if (da) {
+		err = scif_qp_response(da, scifdev);
+		if (err)
+			dev_err(&scifdev->sdev->dev,
+				"scif_qp_response err %d\n", err);
+	} else {
+		schedule_delayed_work(&scifdev->qp_dwork,
+				      msecs_to_jiffies(1000));
+	}
+}
+
+static int scif_setup_scifdev(void)
+{
+	/* We support a maximum of 129 SCIF nodes including the mgmt node */
+#define MAX_SCIF_NODES 129
+	int i;
+	u8 num_nodes = MAX_SCIF_NODES;
+
+	scif_dev = kcalloc(num_nodes, sizeof(*scif_dev), GFP_KERNEL);
+	if (!scif_dev)
+		return -ENOMEM;
+	for (i = 0; i < num_nodes; i++) {
+		struct scif_dev *scifdev = &scif_dev[i];
+
+		scifdev->node = i;
+		scifdev->exit = OP_IDLE;
+		init_waitqueue_head(&scifdev->disconn_wq);
+		mutex_init(&scifdev->lock);
+		INIT_WORK(&scifdev->peer_add_work, scif_add_peer_device);
+		INIT_DELAYED_WORK(&scifdev->p2p_dwork,
+				  scif_poll_qp_state);
+		INIT_DELAYED_WORK(&scifdev->qp_dwork,
+				  scif_qp_setup_handler);
+		INIT_LIST_HEAD(&scifdev->p2p);
+		RCU_INIT_POINTER(scifdev->spdev, NULL);
+	}
+	return 0;
+}
+
+static void scif_destroy_scifdev(void)
+{
+	kfree(scif_dev);
+}
+
+static int scif_probe(struct scif_hw_dev *sdev)
+{
+	struct scif_dev *scifdev = &scif_dev[sdev->dnode];
+	int rc;
+
+	dev_set_drvdata(&sdev->dev, sdev);
+	scifdev->sdev = sdev;
+
+	if (1 == atomic_add_return(1, &g_loopb_cnt)) {
+		struct scif_dev *loopb_dev = &scif_dev[sdev->snode];
+
+		loopb_dev->sdev = sdev;
+		rc = scif_setup_loopback_qp(loopb_dev);
+		if (rc)
+			goto exit;
+	}
+
+	rc = scif_setup_intr_wq(scifdev);
+	if (rc)
+		goto destroy_loopb;
+	rc = scif_setup_qp(scifdev);
+	if (rc)
+		goto destroy_intr;
+	scifdev->db = sdev->hw_ops->next_db(sdev);
+	scifdev->cookie = sdev->hw_ops->request_irq(sdev, scif_intr_handler,
+						    "SCIF_INTR", scifdev,
+						    scifdev->db);
+	if (IS_ERR(scifdev->cookie)) {
+		rc = PTR_ERR(scifdev->cookie);
+		goto free_qp;
+	}
+	if (scif_is_mgmt_node()) {
+		struct mic_bootparam *bp = sdev->dp;
+
+		bp->c2h_scif_db = scifdev->db;
+		bp->scif_host_dma_addr = scifdev->qp_dma_addr;
+	} else {
+		struct mic_bootparam __iomem *bp = sdev->rdp;
+
+		iowrite8(scifdev->db, &bp->h2c_scif_db);
+		writeq(scifdev->qp_dma_addr, &bp->scif_card_dma_addr);
+	}
+	schedule_delayed_work(&scifdev->qp_dwork,
+			      msecs_to_jiffies(1000));
+	return rc;
+free_qp:
+	scif_free_qp(scifdev);
+destroy_intr:
+	scif_destroy_intr_wq(scifdev);
+destroy_loopb:
+	if (atomic_dec_and_test(&g_loopb_cnt))
+		scif_destroy_loopback_qp(&scif_dev[sdev->snode]);
+exit:
+	return rc;
+}
+
+void scif_stop(struct scif_dev *scifdev)
+{
+	struct scif_dev *dev;
+	int i;
+
+	for (i = scif_info.maxid; i >= 0; i--) {
+		dev = &scif_dev[i];
+		if (scifdev_self(dev))
+			continue;
+		scif_handle_remove_node(i);
+	}
+}
+
+static void scif_remove(struct scif_hw_dev *sdev)
+{
+	struct scif_dev *scifdev = &scif_dev[sdev->dnode];
+
+	if (scif_is_mgmt_node()) {
+		struct mic_bootparam *bp = sdev->dp;
+
+		bp->c2h_scif_db = -1;
+		bp->scif_host_dma_addr = 0x0;
+	} else {
+		struct mic_bootparam __iomem *bp = sdev->rdp;
+
+		iowrite8(-1, &bp->h2c_scif_db);
+		writeq(0x0, &bp->scif_card_dma_addr);
+	}
+	if (scif_is_mgmt_node()) {
+		scif_disconnect_node(scifdev->node, true);
+	} else {
+		scif_info.card_initiated_exit = true;
+		scif_stop(scifdev);
+	}
+	if (atomic_dec_and_test(&g_loopb_cnt))
+		scif_destroy_loopback_qp(&scif_dev[sdev->snode]);
+	if (scifdev->cookie) {
+		sdev->hw_ops->free_irq(sdev, scifdev->cookie, scifdev);
+		scifdev->cookie = NULL;
+	}
+	scif_destroy_intr_wq(scifdev);
+	cancel_delayed_work(&scifdev->qp_dwork);
+	scif_free_qp(scifdev);
+	scifdev->rdb = -1;
+	scifdev->sdev = NULL;
+}
+
+static struct scif_hw_dev_id id_table[] = {
+	{ MIC_SCIF_DEV, SCIF_DEV_ANY_ID },
+	{ 0 },
+};
+
+static struct scif_driver scif_driver = {
+	.driver.name =	KBUILD_MODNAME,
+	.driver.owner =	THIS_MODULE,
+	.id_table = id_table,
+	.probe = scif_probe,
+	.remove = scif_remove,
+};
+
+static int _scif_init(void)
+{
+	int rc;
+
+	mutex_init(&scif_info.eplock);
+	spin_lock_init(&scif_info.rmalock);
+	spin_lock_init(&scif_info.nb_connect_lock);
+	spin_lock_init(&scif_info.port_lock);
+	mutex_init(&scif_info.conflock);
+	mutex_init(&scif_info.connlock);
+	mutex_init(&scif_info.fencelock);
+	INIT_LIST_HEAD(&scif_info.uaccept);
+	INIT_LIST_HEAD(&scif_info.listen);
+	INIT_LIST_HEAD(&scif_info.zombie);
+	INIT_LIST_HEAD(&scif_info.connected);
+	INIT_LIST_HEAD(&scif_info.disconnected);
+	INIT_LIST_HEAD(&scif_info.rma);
+	INIT_LIST_HEAD(&scif_info.rma_tc);
+	INIT_LIST_HEAD(&scif_info.mmu_notif_cleanup);
+	INIT_LIST_HEAD(&scif_info.fence);
+	INIT_LIST_HEAD(&scif_info.nb_connect_list);
+	init_waitqueue_head(&scif_info.exitwq);
+	scif_info.rma_tc_limit = SCIF_RMA_TEMP_CACHE_LIMIT;
+	scif_info.en_msg_log = 0;
+	scif_info.p2p_enable = 1;
+	rc = scif_setup_scifdev();
+	if (rc)
+		goto error;
+	unaligned_cache = kmem_cache_create("Unaligned_DMA",
+					    SCIF_KMEM_UNALIGNED_BUF_SIZE,
+					    0, SLAB_HWCACHE_ALIGN, NULL);
+	if (!unaligned_cache) {
+		rc = -ENOMEM;
+		goto free_sdev;
+	}
+	INIT_WORK(&scif_info.misc_work, scif_misc_handler);
+	INIT_WORK(&scif_info.mmu_notif_work, scif_mmu_notif_handler);
+	INIT_WORK(&scif_info.conn_work, scif_conn_handler);
+	idr_init(&scif_ports);
+	return 0;
+free_sdev:
+	scif_destroy_scifdev();
+error:
+	return rc;
+}
+
+static void _scif_exit(void)
+{
+	idr_destroy(&scif_ports);
+	kmem_cache_destroy(unaligned_cache);
+	scif_destroy_scifdev();
+}
+
+static int __init scif_init(void)
+{
+	struct miscdevice *mdev = &scif_info.mdev;
+	int rc;
+
+	_scif_init();
+	iova_cache_get();
+	rc = scif_peer_bus_init();
+	if (rc)
+		goto exit;
+	rc = scif_register_driver(&scif_driver);
+	if (rc)
+		goto peer_bus_exit;
+	rc = misc_register(mdev);
+	if (rc)
+		goto unreg_scif;
+	scif_init_debugfs();
+	return 0;
+unreg_scif:
+	scif_unregister_driver(&scif_driver);
+peer_bus_exit:
+	scif_peer_bus_exit();
+exit:
+	_scif_exit();
+	return rc;
+}
+
+static void __exit scif_exit(void)
+{
+	scif_exit_debugfs();
+	misc_deregister(&scif_info.mdev);
+	scif_unregister_driver(&scif_driver);
+	scif_peer_bus_exit();
+	iova_cache_put();
+	_scif_exit();
+}
+
+module_init(scif_init);
+module_exit(scif_exit);
+
+MODULE_DEVICE_TABLE(scif, id_table);
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Intel(R) SCIF driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/misc/mic/scif/scif_main.h b/drivers/misc/mic/scif/scif_main.h
new file mode 100644
index 000000000..0e5eff9ad
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_main.h
@@ -0,0 +1,283 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#ifndef SCIF_MAIN_H
+#define SCIF_MAIN_H
+
+#include <linux/sched/signal.h>
+#include <linux/pci.h>
+#include <linux/miscdevice.h>
+#include <linux/dmaengine.h>
+#include <linux/iova.h>
+#include <linux/anon_inodes.h>
+#include <linux/file.h>
+#include <linux/vmalloc.h>
+#include <linux/scif.h>
+#include "../common/mic_dev.h"
+
+#define SCIF_MGMT_NODE 0
+#define SCIF_DEFAULT_WATCHDOG_TO 30
+#define SCIF_NODE_ACCEPT_TIMEOUT (3 * HZ)
+#define SCIF_NODE_ALIVE_TIMEOUT (SCIF_DEFAULT_WATCHDOG_TO * HZ)
+#define SCIF_RMA_TEMP_CACHE_LIMIT 0x20000
+
+/*
+ * Generic state used for certain node QP message exchanges
+ * like Unregister, Alloc etc.
+ */
+enum scif_msg_state {
+	OP_IDLE = 1,
+	OP_IN_PROGRESS,
+	OP_COMPLETED,
+	OP_FAILED
+};
+
+/*
+ * struct scif_info - Global SCIF information
+ *
+ * @nodeid: Node ID this node is to others
+ * @maxid: Max known node ID
+ * @total: Total number of SCIF nodes
+ * @nr_zombies: number of zombie endpoints
+ * @eplock: Lock to synchronize listening, zombie endpoint lists
+ * @connlock: Lock to synchronize connected and disconnected lists
+ * @nb_connect_lock: Synchronize non blocking connect operations
+ * @port_lock: Synchronize access to SCIF ports
+ * @uaccept: List of user acceptreq waiting for acceptreg
+ * @listen: List of listening end points
+ * @zombie: List of zombie end points with pending RMA's
+ * @connected: List of end points in connected state
+ * @disconnected: List of end points in disconnected state
+ * @nb_connect_list: List for non blocking connections
+ * @misc_work: miscellaneous SCIF tasks
+ * @conflock: Lock to synchronize SCIF node configuration changes
+ * @en_msg_log: Enable debug message logging
+ * @p2p_enable: Enable P2P SCIF network
+ * @mdev: The MISC device
+ * @conn_work: Work for workqueue handling all connections
+ * @exitwq: Wait queue for waiting for an EXIT node QP message response
+ * @loopb_dev: Dummy SCIF device used for loopback
+ * @loopb_wq: Workqueue used for handling loopback messages
+ * @loopb_wqname[16]: Name of loopback workqueue
+ * @loopb_work: Used for submitting work to loopb_wq
+ * @loopb_recv_q: List of messages received on the loopb_wq
+ * @card_initiated_exit: set when the card has initiated the exit
+ * @rmalock: Synchronize access to RMA operations
+ * @fencelock: Synchronize access to list of remote fences requested.
+ * @rma: List of temporary registered windows to be destroyed.
+ * @rma_tc: List of temporary registered & cached Windows to be destroyed
+ * @fence: List of remote fence requests
+ * @mmu_notif_work: Work for registration caching MMU notifier workqueue
+ * @mmu_notif_cleanup: List of temporary cached windows for reg cache
+ * @rma_tc_limit: RMA temporary cache limit
+ */
+struct scif_info {
+	u8 nodeid;
+	u8 maxid;
+	u8 total;
+	u32 nr_zombies;
+	struct mutex eplock;
+	struct mutex connlock;
+	spinlock_t nb_connect_lock;
+	spinlock_t port_lock;
+	struct list_head uaccept;
+	struct list_head listen;
+	struct list_head zombie;
+	struct list_head connected;
+	struct list_head disconnected;
+	struct list_head nb_connect_list;
+	struct work_struct misc_work;
+	struct mutex conflock;
+	u8 en_msg_log;
+	u8 p2p_enable;
+	struct miscdevice mdev;
+	struct work_struct conn_work;
+	wait_queue_head_t exitwq;
+	struct scif_dev *loopb_dev;
+	struct workqueue_struct *loopb_wq;
+	char loopb_wqname[16];
+	struct work_struct loopb_work;
+	struct list_head loopb_recv_q;
+	bool card_initiated_exit;
+	spinlock_t rmalock;
+	struct mutex fencelock;
+	struct list_head rma;
+	struct list_head rma_tc;
+	struct list_head fence;
+	struct work_struct mmu_notif_work;
+	struct list_head mmu_notif_cleanup;
+	unsigned long rma_tc_limit;
+};
+
+/*
+ * struct scif_p2p_info - SCIF mapping information used for P2P
+ *
+ * @ppi_peer_id - SCIF peer node id
+ * @ppi_sg - Scatter list for bar information (One for mmio and one for aper)
+ * @sg_nentries - Number of entries in the scatterlist
+ * @ppi_da: DMA address for MMIO and APER bars
+ * @ppi_len: Length of MMIO and APER bars
+ * @ppi_list: Link in list of mapping information
+ */
+struct scif_p2p_info {
+	u8 ppi_peer_id;
+	struct scatterlist *ppi_sg[2];
+	u64 sg_nentries[2];
+	dma_addr_t ppi_da[2];
+	u64 ppi_len[2];
+#define SCIF_PPI_MMIO 0
+#define SCIF_PPI_APER 1
+	struct list_head ppi_list;
+};
+
+/*
+ * struct scif_dev - SCIF remote device specific fields
+ *
+ * @node: Node id
+ * @p2p: List of P2P mapping information
+ * @qpairs: The node queue pair for exchanging control messages
+ * @intr_wq: Workqueue for handling Node QP messages
+ * @intr_wqname: Name of node QP workqueue for handling interrupts
+ * @intr_bh: Used for submitting work to intr_wq
+ * @lock: Lock used for synchronizing access to the scif device
+ * @sdev: SCIF hardware device on the SCIF hardware bus
+ * @db: doorbell the peer will trigger to generate an interrupt on self
+ * @rdb: Doorbell to trigger on the peer to generate an interrupt on the peer
+ * @cookie: Cookie received while registering the interrupt handler
+ * @peer_add_work: Work for handling device_add for peer devices
+ * @p2p_dwork: Delayed work to enable polling for P2P state
+ * @qp_dwork: Delayed work for enabling polling for remote QP information
+ * @p2p_retry: Number of times to retry polling of P2P state
+ * @base_addr: P2P aperture bar base address
+ * @mic_mw mmio: The peer MMIO information used for P2P
+ * @spdev: SCIF peer device on the SCIF peer bus
+ * @node_remove_ack_pending: True if a node_remove_ack is pending
+ * @exit_ack_pending: true if an exit_ack is pending
+ * @disconn_wq: Used while waiting for a node remove response
+ * @disconn_rescnt: Keeps track of number of node remove requests sent
+ * @exit: Status of exit message
+ * @qp_dma_addr: Queue pair DMA address passed to the peer
+ * @dma_ch_idx: Round robin index for DMA channels
+ * @signal_pool: DMA pool used for scheduling scif_fence_signal DMA's
+*/
+struct scif_dev {
+	u8 node;
+	struct list_head p2p;
+	struct scif_qp *qpairs;
+	struct workqueue_struct *intr_wq;
+	char intr_wqname[16];
+	struct work_struct intr_bh;
+	struct mutex lock;
+	struct scif_hw_dev *sdev;
+	int db;
+	int rdb;
+	struct mic_irq *cookie;
+	struct work_struct peer_add_work;
+	struct delayed_work p2p_dwork;
+	struct delayed_work qp_dwork;
+	int p2p_retry;
+	dma_addr_t base_addr;
+	struct mic_mw mmio;
+	struct scif_peer_dev __rcu *spdev;
+	bool node_remove_ack_pending;
+	bool exit_ack_pending;
+	wait_queue_head_t disconn_wq;
+	atomic_t disconn_rescnt;
+	enum scif_msg_state exit;
+	dma_addr_t qp_dma_addr;
+	int dma_ch_idx;
+	struct dma_pool *signal_pool;
+};
+
+extern bool scif_reg_cache_enable;
+extern bool scif_ulimit_check;
+extern struct scif_info scif_info;
+extern struct idr scif_ports;
+extern struct bus_type scif_peer_bus;
+extern struct scif_dev *scif_dev;
+extern const struct file_operations scif_fops;
+extern const struct file_operations scif_anon_fops;
+
+/* Size of the RB for the Node QP */
+#define SCIF_NODE_QP_SIZE 0x10000
+
+#include "scif_nodeqp.h"
+#include "scif_rma.h"
+#include "scif_rma_list.h"
+
+/*
+ * scifdev_self:
+ * @dev: The remote SCIF Device
+ *
+ * Returns true if the SCIF Device passed is the self aka Loopback SCIF device.
+ */
+static inline int scifdev_self(struct scif_dev *dev)
+{
+	return dev->node == scif_info.nodeid;
+}
+
+static inline bool scif_is_mgmt_node(void)
+{
+	return !scif_info.nodeid;
+}
+
+/*
+ * scifdev_is_p2p:
+ * @dev: The remote SCIF Device
+ *
+ * Returns true if the SCIF Device is a MIC Peer to Peer SCIF device.
+ */
+static inline bool scifdev_is_p2p(struct scif_dev *dev)
+{
+	if (scif_is_mgmt_node())
+		return false;
+	else
+		return dev != &scif_dev[SCIF_MGMT_NODE] &&
+			!scifdev_self(dev);
+}
+
+/*
+ * scifdev_alive:
+ * @scifdev: The remote SCIF Device
+ *
+ * Returns true if the remote SCIF Device is running or sleeping for
+ * this endpoint.
+ */
+static inline int _scifdev_alive(struct scif_dev *scifdev)
+{
+	struct scif_peer_dev *spdev;
+
+	rcu_read_lock();
+	spdev = rcu_dereference(scifdev->spdev);
+	rcu_read_unlock();
+	return !!spdev;
+}
+
+#include "scif_epd.h"
+
+void __init scif_init_debugfs(void);
+void scif_exit_debugfs(void);
+int scif_setup_intr_wq(struct scif_dev *scifdev);
+void scif_destroy_intr_wq(struct scif_dev *scifdev);
+void scif_cleanup_scifdev(struct scif_dev *dev);
+void scif_handle_remove_node(int node);
+void scif_disconnect_node(u32 node_id, bool mgmt_initiated);
+void scif_free_qp(struct scif_dev *dev);
+void scif_misc_handler(struct work_struct *work);
+void scif_stop(struct scif_dev *scifdev);
+irqreturn_t scif_intr_handler(int irq, void *data);
+#endif /* SCIF_MAIN_H */
diff --git a/drivers/misc/mic/scif/scif_map.h b/drivers/misc/mic/scif/scif_map.h
new file mode 100644
index 000000000..3e86360ba
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_map.h
@@ -0,0 +1,136 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#ifndef SCIF_MAP_H
+#define SCIF_MAP_H
+
+#include "../bus/scif_bus.h"
+
+static __always_inline void *
+scif_alloc_coherent(dma_addr_t *dma_handle,
+		    struct scif_dev *scifdev, size_t size,
+		    gfp_t gfp)
+{
+	void *va;
+
+	if (scifdev_self(scifdev)) {
+		va = kmalloc(size, gfp);
+		if (va)
+			*dma_handle = virt_to_phys(va);
+	} else {
+		va = dma_alloc_coherent(&scifdev->sdev->dev,
+					size, dma_handle, gfp);
+		if (va && scifdev_is_p2p(scifdev))
+			*dma_handle = *dma_handle + scifdev->base_addr;
+	}
+	return va;
+}
+
+static __always_inline void
+scif_free_coherent(void *va, dma_addr_t local,
+		   struct scif_dev *scifdev, size_t size)
+{
+	if (scifdev_self(scifdev)) {
+		kfree(va);
+	} else {
+		if (scifdev_is_p2p(scifdev) && local > scifdev->base_addr)
+			local = local - scifdev->base_addr;
+		dma_free_coherent(&scifdev->sdev->dev,
+				  size, va, local);
+	}
+}
+
+static __always_inline int
+scif_map_single(dma_addr_t *dma_handle,
+		void *local, struct scif_dev *scifdev, size_t size)
+{
+	int err = 0;
+
+	if (scifdev_self(scifdev)) {
+		*dma_handle = virt_to_phys((local));
+	} else {
+		*dma_handle = dma_map_single(&scifdev->sdev->dev,
+					     local, size, DMA_BIDIRECTIONAL);
+		if (dma_mapping_error(&scifdev->sdev->dev, *dma_handle))
+			err = -ENOMEM;
+		else if (scifdev_is_p2p(scifdev))
+			*dma_handle = *dma_handle + scifdev->base_addr;
+	}
+	if (err)
+		*dma_handle = 0;
+	return err;
+}
+
+static __always_inline void
+scif_unmap_single(dma_addr_t local, struct scif_dev *scifdev,
+		  size_t size)
+{
+	if (!scifdev_self(scifdev)) {
+		if (scifdev_is_p2p(scifdev))
+			local = local - scifdev->base_addr;
+		dma_unmap_single(&scifdev->sdev->dev, local,
+				 size, DMA_BIDIRECTIONAL);
+	}
+}
+
+static __always_inline void *
+scif_ioremap(dma_addr_t phys, size_t size, struct scif_dev *scifdev)
+{
+	void *out_virt;
+	struct scif_hw_dev *sdev = scifdev->sdev;
+
+	if (scifdev_self(scifdev))
+		out_virt = phys_to_virt(phys);
+	else
+		out_virt = (void __force *)
+			   sdev->hw_ops->ioremap(sdev, phys, size);
+	return out_virt;
+}
+
+static __always_inline void
+scif_iounmap(void *virt, size_t len, struct scif_dev *scifdev)
+{
+	if (!scifdev_self(scifdev)) {
+		struct scif_hw_dev *sdev = scifdev->sdev;
+
+		sdev->hw_ops->iounmap(sdev, (void __force __iomem *)virt);
+	}
+}
+
+static __always_inline int
+scif_map_page(dma_addr_t *dma_handle, struct page *page,
+	      struct scif_dev *scifdev)
+{
+	int err = 0;
+
+	if (scifdev_self(scifdev)) {
+		*dma_handle = page_to_phys(page);
+	} else {
+		struct scif_hw_dev *sdev = scifdev->sdev;
+		*dma_handle = dma_map_page(&sdev->dev,
+					   page, 0x0, PAGE_SIZE,
+					   DMA_BIDIRECTIONAL);
+		if (dma_mapping_error(&sdev->dev, *dma_handle))
+			err = -ENOMEM;
+		else if (scifdev_is_p2p(scifdev))
+			*dma_handle = *dma_handle + scifdev->base_addr;
+	}
+	if (err)
+		*dma_handle = 0;
+	return err;
+}
+#endif  /* SCIF_MAP_H */
diff --git a/drivers/misc/mic/scif/scif_mmap.c b/drivers/misc/mic/scif/scif_mmap.c
new file mode 100644
index 000000000..928211677
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_mmap.c
@@ -0,0 +1,699 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include "scif_main.h"
+
+/*
+ * struct scif_vma_info - Information about a remote memory mapping
+ *			  created via scif_mmap(..)
+ * @vma: VM area struct
+ * @list: link to list of active vmas
+ */
+struct scif_vma_info {
+	struct vm_area_struct *vma;
+	struct list_head list;
+};
+
+void scif_recv_munmap(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_rma_req req;
+	struct scif_window *window = NULL;
+	struct scif_window *recv_window =
+		(struct scif_window *)msg->payload[0];
+	struct scif_endpt *ep;
+
+	ep = (struct scif_endpt *)recv_window->ep;
+	req.out_window = &window;
+	req.offset = recv_window->offset;
+	req.prot = recv_window->prot;
+	req.nr_bytes = recv_window->nr_pages << PAGE_SHIFT;
+	req.type = SCIF_WINDOW_FULL;
+	req.head = &ep->rma_info.reg_list;
+	msg->payload[0] = ep->remote_ep;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	/* Does a valid window exist? */
+	if (scif_query_window(&req)) {
+		dev_err(&scifdev->sdev->dev,
+			"%s %d -ENXIO\n", __func__, __LINE__);
+		msg->uop = SCIF_UNREGISTER_ACK;
+		goto error;
+	}
+
+	scif_put_window(window, window->nr_pages);
+
+	if (!window->ref_count) {
+		atomic_inc(&ep->rma_info.tw_refcount);
+		ep->rma_info.async_list_del = 1;
+		list_del_init(&window->list);
+		scif_free_window_offset(ep, window, window->offset);
+	}
+error:
+	mutex_unlock(&ep->rma_info.rma_lock);
+	if (window && !window->ref_count)
+		scif_queue_for_cleanup(window, &scif_info.rma);
+}
+
+/*
+ * Remove valid remote memory mappings created via scif_mmap(..) from the
+ * process address space since the remote node is lost
+ */
+static void __scif_zap_mmaps(struct scif_endpt *ep)
+{
+	struct list_head *item;
+	struct scif_vma_info *info;
+	struct vm_area_struct *vma;
+	unsigned long size;
+
+	spin_lock(&ep->lock);
+	list_for_each(item, &ep->rma_info.vma_list) {
+		info = list_entry(item, struct scif_vma_info, list);
+		vma = info->vma;
+		size = vma->vm_end - vma->vm_start;
+		zap_vma_ptes(vma, vma->vm_start, size);
+		dev_dbg(scif_info.mdev.this_device,
+			"%s ep %p zap vma %p size 0x%lx\n",
+			__func__, ep, info->vma, size);
+	}
+	spin_unlock(&ep->lock);
+}
+
+/*
+ * Traverse the list of endpoints for a particular remote node and
+ * zap valid remote memory mappings since the remote node is lost
+ */
+static void _scif_zap_mmaps(int node, struct list_head *head)
+{
+	struct scif_endpt *ep;
+	struct list_head *item;
+
+	mutex_lock(&scif_info.connlock);
+	list_for_each(item, head) {
+		ep = list_entry(item, struct scif_endpt, list);
+		if (ep->remote_dev->node == node)
+			__scif_zap_mmaps(ep);
+	}
+	mutex_unlock(&scif_info.connlock);
+}
+
+/*
+ * Wrapper for removing remote memory mappings for a particular node. This API
+ * is called by peer nodes as part of handling a lost node.
+ */
+void scif_zap_mmaps(int node)
+{
+	_scif_zap_mmaps(node, &scif_info.connected);
+	_scif_zap_mmaps(node, &scif_info.disconnected);
+}
+
+/*
+ * This API is only called while handling a lost node:
+ * a) Remote node is dead.
+ * b) Remote memory mappings have been zapped
+ * So we can traverse the remote_reg_list without any locks. Since
+ * the window has not yet been unregistered we can drop the ref count
+ * and queue it to the cleanup thread.
+ */
+static void __scif_cleanup_rma_for_zombies(struct scif_endpt *ep)
+{
+	struct list_head *pos, *tmp;
+	struct scif_window *window;
+
+	list_for_each_safe(pos, tmp, &ep->rma_info.remote_reg_list) {
+		window = list_entry(pos, struct scif_window, list);
+		if (window->ref_count)
+			scif_put_window(window, window->nr_pages);
+		else
+			dev_err(scif_info.mdev.this_device,
+				"%s %d unexpected\n",
+				__func__, __LINE__);
+		if (!window->ref_count) {
+			atomic_inc(&ep->rma_info.tw_refcount);
+			list_del_init(&window->list);
+			scif_queue_for_cleanup(window, &scif_info.rma);
+		}
+	}
+}
+
+/* Cleanup remote registration lists for zombie endpoints */
+void scif_cleanup_rma_for_zombies(int node)
+{
+	struct scif_endpt *ep;
+	struct list_head *item;
+
+	mutex_lock(&scif_info.eplock);
+	list_for_each(item, &scif_info.zombie) {
+		ep = list_entry(item, struct scif_endpt, list);
+		if (ep->remote_dev && ep->remote_dev->node == node)
+			__scif_cleanup_rma_for_zombies(ep);
+	}
+	mutex_unlock(&scif_info.eplock);
+	flush_work(&scif_info.misc_work);
+}
+
+/* Insert the VMA into the per endpoint VMA list */
+static int scif_insert_vma(struct scif_endpt *ep, struct vm_area_struct *vma)
+{
+	struct scif_vma_info *info;
+	int err = 0;
+
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	if (!info) {
+		err = -ENOMEM;
+		goto done;
+	}
+	info->vma = vma;
+	spin_lock(&ep->lock);
+	list_add_tail(&info->list, &ep->rma_info.vma_list);
+	spin_unlock(&ep->lock);
+done:
+	return err;
+}
+
+/* Delete the VMA from the per endpoint VMA list */
+static void scif_delete_vma(struct scif_endpt *ep, struct vm_area_struct *vma)
+{
+	struct list_head *item;
+	struct scif_vma_info *info;
+
+	spin_lock(&ep->lock);
+	list_for_each(item, &ep->rma_info.vma_list) {
+		info = list_entry(item, struct scif_vma_info, list);
+		if (info->vma == vma) {
+			list_del(&info->list);
+			kfree(info);
+			break;
+		}
+	}
+	spin_unlock(&ep->lock);
+}
+
+static phys_addr_t scif_get_phys(phys_addr_t phys, struct scif_endpt *ep)
+{
+	struct scif_dev *scifdev = (struct scif_dev *)ep->remote_dev;
+	struct scif_hw_dev *sdev = scifdev->sdev;
+	phys_addr_t out_phys, apt_base = 0;
+
+	/*
+	 * If the DMA address is card relative then we need to add the
+	 * aperture base for mmap to work correctly
+	 */
+	if (!scifdev_self(scifdev) && sdev->aper && sdev->card_rel_da)
+		apt_base = sdev->aper->pa;
+	out_phys = apt_base + phys;
+	return out_phys;
+}
+
+int scif_get_pages(scif_epd_t epd, off_t offset, size_t len,
+		   struct scif_range **pages)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	struct scif_rma_req req;
+	struct scif_window *window = NULL;
+	int nr_pages, err, i;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI get_pinned_pages: ep %p offset 0x%lx len 0x%lx\n",
+		ep, offset, len);
+	err = scif_verify_epd(ep);
+	if (err)
+		return err;
+
+	if (!len || (offset < 0) ||
+	    (offset + len < offset) ||
+	    (ALIGN(offset, PAGE_SIZE) != offset) ||
+	    (ALIGN(len, PAGE_SIZE) != len))
+		return -EINVAL;
+
+	nr_pages = len >> PAGE_SHIFT;
+
+	req.out_window = &window;
+	req.offset = offset;
+	req.prot = 0;
+	req.nr_bytes = len;
+	req.type = SCIF_WINDOW_SINGLE;
+	req.head = &ep->rma_info.remote_reg_list;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	/* Does a valid window exist? */
+	err = scif_query_window(&req);
+	if (err) {
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %d\n", __func__, __LINE__, err);
+		goto error;
+	}
+
+	/* Allocate scif_range */
+	*pages = kzalloc(sizeof(**pages), GFP_KERNEL);
+	if (!*pages) {
+		err = -ENOMEM;
+		goto error;
+	}
+
+	/* Allocate phys addr array */
+	(*pages)->phys_addr = scif_zalloc(nr_pages * sizeof(dma_addr_t));
+	if (!((*pages)->phys_addr)) {
+		err = -ENOMEM;
+		goto error;
+	}
+
+	if (scif_is_mgmt_node() && !scifdev_self(ep->remote_dev)) {
+		/* Allocate virtual address array */
+		((*pages)->va = scif_zalloc(nr_pages * sizeof(void *)));
+		if (!(*pages)->va) {
+			err = -ENOMEM;
+			goto error;
+		}
+	}
+	/* Populate the values */
+	(*pages)->cookie = window;
+	(*pages)->nr_pages = nr_pages;
+	(*pages)->prot_flags = window->prot;
+
+	for (i = 0; i < nr_pages; i++) {
+		(*pages)->phys_addr[i] =
+			__scif_off_to_dma_addr(window, offset +
+					       (i * PAGE_SIZE));
+		(*pages)->phys_addr[i] = scif_get_phys((*pages)->phys_addr[i],
+							ep);
+		if (scif_is_mgmt_node() && !scifdev_self(ep->remote_dev))
+			(*pages)->va[i] =
+				ep->remote_dev->sdev->aper->va +
+				(*pages)->phys_addr[i] -
+				ep->remote_dev->sdev->aper->pa;
+	}
+
+	scif_get_window(window, nr_pages);
+error:
+	mutex_unlock(&ep->rma_info.rma_lock);
+	if (err) {
+		if (*pages) {
+			scif_free((*pages)->phys_addr,
+				  nr_pages * sizeof(dma_addr_t));
+			scif_free((*pages)->va,
+				  nr_pages * sizeof(void *));
+			kfree(*pages);
+			*pages = NULL;
+		}
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %d\n", __func__, __LINE__, err);
+	}
+	return err;
+}
+EXPORT_SYMBOL_GPL(scif_get_pages);
+
+int scif_put_pages(struct scif_range *pages)
+{
+	struct scif_endpt *ep;
+	struct scif_window *window;
+	struct scifmsg msg;
+
+	if (!pages || !pages->cookie)
+		return -EINVAL;
+
+	window = pages->cookie;
+
+	if (!window || window->magic != SCIFEP_MAGIC)
+		return -EINVAL;
+
+	ep = (struct scif_endpt *)window->ep;
+	/*
+	 * If the state is SCIFEP_CONNECTED or SCIFEP_DISCONNECTED then the
+	 * callee should be allowed to release references to the pages,
+	 * else the endpoint was not connected in the first place,
+	 * hence the ENOTCONN.
+	 */
+	if (ep->state != SCIFEP_CONNECTED && ep->state != SCIFEP_DISCONNECTED)
+		return -ENOTCONN;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+
+	scif_put_window(window, pages->nr_pages);
+
+	/* Initiate window destruction if ref count is zero */
+	if (!window->ref_count) {
+		list_del(&window->list);
+		mutex_unlock(&ep->rma_info.rma_lock);
+		scif_drain_dma_intr(ep->remote_dev->sdev,
+				    ep->rma_info.dma_chan);
+		/* Inform the peer about this window being destroyed. */
+		msg.uop = SCIF_MUNMAP;
+		msg.src = ep->port;
+		msg.payload[0] = window->peer_window;
+		/* No error handling for notification messages */
+		scif_nodeqp_send(ep->remote_dev, &msg);
+		/* Destroy this window from the peer's registered AS */
+		scif_destroy_remote_window(window);
+	} else {
+		mutex_unlock(&ep->rma_info.rma_lock);
+	}
+
+	scif_free(pages->phys_addr, pages->nr_pages * sizeof(dma_addr_t));
+	scif_free(pages->va, pages->nr_pages * sizeof(void *));
+	kfree(pages);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(scif_put_pages);
+
+/*
+ * scif_rma_list_mmap:
+ *
+ * Traverse the remote registration list starting from start_window:
+ * 1) Create VtoP mappings via remap_pfn_range(..)
+ * 2) Once step 1) and 2) complete successfully then traverse the range of
+ *    windows again and bump the reference count.
+ * RMA lock must be held.
+ */
+static int scif_rma_list_mmap(struct scif_window *start_window, s64 offset,
+			      int nr_pages, struct vm_area_struct *vma)
+{
+	s64 end_offset, loop_offset = offset;
+	struct scif_window *window = start_window;
+	int loop_nr_pages, nr_pages_left = nr_pages;
+	struct scif_endpt *ep = (struct scif_endpt *)start_window->ep;
+	struct list_head *head = &ep->rma_info.remote_reg_list;
+	int i, err = 0;
+	dma_addr_t phys_addr;
+	struct scif_window_iter src_win_iter;
+	size_t contig_bytes = 0;
+
+	might_sleep();
+	list_for_each_entry_from(window, head, list) {
+		end_offset = window->offset +
+			(window->nr_pages << PAGE_SHIFT);
+		loop_nr_pages = min_t(int,
+				      (end_offset - loop_offset) >> PAGE_SHIFT,
+				      nr_pages_left);
+		scif_init_window_iter(window, &src_win_iter);
+		for (i = 0; i < loop_nr_pages; i++) {
+			phys_addr = scif_off_to_dma_addr(window, loop_offset,
+							 &contig_bytes,
+							 &src_win_iter);
+			phys_addr = scif_get_phys(phys_addr, ep);
+			err = remap_pfn_range(vma,
+					      vma->vm_start +
+					      loop_offset - offset,
+					      phys_addr >> PAGE_SHIFT,
+					      PAGE_SIZE,
+					      vma->vm_page_prot);
+			if (err)
+				goto error;
+			loop_offset += PAGE_SIZE;
+		}
+		nr_pages_left -= loop_nr_pages;
+		if (!nr_pages_left)
+			break;
+	}
+	/*
+	 * No more failures expected. Bump up the ref count for all
+	 * the windows. Another traversal from start_window required
+	 * for handling errors encountered across windows during
+	 * remap_pfn_range(..).
+	 */
+	loop_offset = offset;
+	nr_pages_left = nr_pages;
+	window = start_window;
+	head = &ep->rma_info.remote_reg_list;
+	list_for_each_entry_from(window, head, list) {
+		end_offset = window->offset +
+			(window->nr_pages << PAGE_SHIFT);
+		loop_nr_pages = min_t(int,
+				      (end_offset - loop_offset) >> PAGE_SHIFT,
+				      nr_pages_left);
+		scif_get_window(window, loop_nr_pages);
+		nr_pages_left -= loop_nr_pages;
+		loop_offset += (loop_nr_pages << PAGE_SHIFT);
+		if (!nr_pages_left)
+			break;
+	}
+error:
+	if (err)
+		dev_err(scif_info.mdev.this_device,
+			"%s %d err %d\n", __func__, __LINE__, err);
+	return err;
+}
+
+/*
+ * scif_rma_list_munmap:
+ *
+ * Traverse the remote registration list starting from window:
+ * 1) Decrement ref count.
+ * 2) If the ref count drops to zero then send a SCIF_MUNMAP message to peer.
+ * RMA lock must be held.
+ */
+static void scif_rma_list_munmap(struct scif_window *start_window,
+				 s64 offset, int nr_pages)
+{
+	struct scifmsg msg;
+	s64 loop_offset = offset, end_offset;
+	int loop_nr_pages, nr_pages_left = nr_pages;
+	struct scif_endpt *ep = (struct scif_endpt *)start_window->ep;
+	struct list_head *head = &ep->rma_info.remote_reg_list;
+	struct scif_window *window = start_window, *_window;
+
+	msg.uop = SCIF_MUNMAP;
+	msg.src = ep->port;
+	loop_offset = offset;
+	nr_pages_left = nr_pages;
+	list_for_each_entry_safe_from(window, _window, head, list) {
+		end_offset = window->offset +
+			(window->nr_pages << PAGE_SHIFT);
+		loop_nr_pages = min_t(int,
+				      (end_offset - loop_offset) >> PAGE_SHIFT,
+				      nr_pages_left);
+		scif_put_window(window, loop_nr_pages);
+		if (!window->ref_count) {
+			struct scif_dev *rdev = ep->remote_dev;
+
+			scif_drain_dma_intr(rdev->sdev,
+					    ep->rma_info.dma_chan);
+			/* Inform the peer about this munmap */
+			msg.payload[0] = window->peer_window;
+			/* No error handling for Notification messages. */
+			scif_nodeqp_send(ep->remote_dev, &msg);
+			list_del(&window->list);
+			/* Destroy this window from the peer's registered AS */
+			scif_destroy_remote_window(window);
+		}
+		nr_pages_left -= loop_nr_pages;
+		loop_offset += (loop_nr_pages << PAGE_SHIFT);
+		if (!nr_pages_left)
+			break;
+	}
+}
+
+/*
+ * The private data field of each VMA used to mmap a remote window
+ * points to an instance of struct vma_pvt
+ */
+struct vma_pvt {
+	struct scif_endpt *ep;	/* End point for remote window */
+	s64 offset;		/* offset within remote window */
+	bool valid_offset;	/* offset is valid only if the original
+				 * mmap request was for a single page
+				 * else the offset within the vma is
+				 * the correct offset
+				 */
+	struct kref ref;
+};
+
+static void vma_pvt_release(struct kref *ref)
+{
+	struct vma_pvt *vmapvt = container_of(ref, struct vma_pvt, ref);
+
+	kfree(vmapvt);
+}
+
+/**
+ * scif_vma_open - VMA open driver callback
+ * @vma: VMM memory area.
+ * The open method is called by the kernel to allow the subsystem implementing
+ * the VMA to initialize the area. This method is invoked any time a new
+ * reference to the VMA is made (when a process forks, for example).
+ * The one exception happens when the VMA is first created by mmap;
+ * in this case, the driver's mmap method is called instead.
+ * This function is also invoked when an existing VMA is split by the kernel
+ * due to a call to munmap on a subset of the VMA resulting in two VMAs.
+ * The kernel invokes this function only on one of the two VMAs.
+ */
+static void scif_vma_open(struct vm_area_struct *vma)
+{
+	struct vma_pvt *vmapvt = vma->vm_private_data;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI vma open: vma_start 0x%lx vma_end 0x%lx\n",
+		vma->vm_start, vma->vm_end);
+	scif_insert_vma(vmapvt->ep, vma);
+	kref_get(&vmapvt->ref);
+}
+
+/**
+ * scif_munmap - VMA close driver callback.
+ * @vma: VMM memory area.
+ * When an area is destroyed, the kernel calls its close operation.
+ * Note that there's no usage count associated with VMA's; the area
+ * is opened and closed exactly once by each process that uses it.
+ */
+static void scif_munmap(struct vm_area_struct *vma)
+{
+	struct scif_endpt *ep;
+	struct vma_pvt *vmapvt = vma->vm_private_data;
+	int nr_pages = vma_pages(vma);
+	s64 offset;
+	struct scif_rma_req req;
+	struct scif_window *window = NULL;
+	int err;
+
+	might_sleep();
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI munmap: vma_start 0x%lx vma_end 0x%lx\n",
+		vma->vm_start, vma->vm_end);
+	ep = vmapvt->ep;
+	offset = vmapvt->valid_offset ? vmapvt->offset :
+		(vma->vm_pgoff) << PAGE_SHIFT;
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI munmap: ep %p nr_pages 0x%x offset 0x%llx\n",
+		ep, nr_pages, offset);
+	req.out_window = &window;
+	req.offset = offset;
+	req.nr_bytes = vma->vm_end - vma->vm_start;
+	req.prot = vma->vm_flags & (VM_READ | VM_WRITE);
+	req.type = SCIF_WINDOW_PARTIAL;
+	req.head = &ep->rma_info.remote_reg_list;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+
+	err = scif_query_window(&req);
+	if (err)
+		dev_err(scif_info.mdev.this_device,
+			"%s %d err %d\n", __func__, __LINE__, err);
+	else
+		scif_rma_list_munmap(window, offset, nr_pages);
+
+	mutex_unlock(&ep->rma_info.rma_lock);
+	/*
+	 * The kernel probably zeroes these out but we still want
+	 * to clean up our own mess just in case.
+	 */
+	vma->vm_ops = NULL;
+	vma->vm_private_data = NULL;
+	kref_put(&vmapvt->ref, vma_pvt_release);
+	scif_delete_vma(ep, vma);
+}
+
+static const struct vm_operations_struct scif_vm_ops = {
+	.open = scif_vma_open,
+	.close = scif_munmap,
+};
+
+/**
+ * scif_mmap - Map pages in virtual address space to a remote window.
+ * @vma: VMM memory area.
+ * @epd: endpoint descriptor
+ *
+ * Return: Upon successful completion, scif_mmap() returns zero
+ * else an apt error is returned as documented in scif.h
+ */
+int scif_mmap(struct vm_area_struct *vma, scif_epd_t epd)
+{
+	struct scif_rma_req req;
+	struct scif_window *window = NULL;
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	s64 start_offset = vma->vm_pgoff << PAGE_SHIFT;
+	int nr_pages = vma_pages(vma);
+	int err;
+	struct vma_pvt *vmapvt;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI mmap: ep %p start_offset 0x%llx nr_pages 0x%x\n",
+		ep, start_offset, nr_pages);
+	err = scif_verify_epd(ep);
+	if (err)
+		return err;
+
+	might_sleep();
+
+	err = scif_insert_vma(ep, vma);
+	if (err)
+		return err;
+
+	vmapvt = kzalloc(sizeof(*vmapvt), GFP_KERNEL);
+	if (!vmapvt) {
+		scif_delete_vma(ep, vma);
+		return -ENOMEM;
+	}
+
+	vmapvt->ep = ep;
+	kref_init(&vmapvt->ref);
+
+	req.out_window = &window;
+	req.offset = start_offset;
+	req.nr_bytes = vma->vm_end - vma->vm_start;
+	req.prot = vma->vm_flags & (VM_READ | VM_WRITE);
+	req.type = SCIF_WINDOW_PARTIAL;
+	req.head = &ep->rma_info.remote_reg_list;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	/* Does a valid window exist? */
+	err = scif_query_window(&req);
+	if (err) {
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %d\n", __func__, __LINE__, err);
+		goto error_unlock;
+	}
+
+	/* Default prot for loopback */
+	if (!scifdev_self(ep->remote_dev))
+		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+
+	/*
+	 * VM_DONTCOPY - Do not copy this vma on fork
+	 * VM_DONTEXPAND - Cannot expand with mremap()
+	 * VM_RESERVED - Count as reserved_vm like IO
+	 * VM_PFNMAP - Page-ranges managed without "struct page"
+	 * VM_IO - Memory mapped I/O or similar
+	 *
+	 * We do not want to copy this VMA automatically on a fork(),
+	 * expand this VMA due to mremap() or swap out these pages since
+	 * the VMA is actually backed by physical pages in the remote
+	 * node's physical memory and not via a struct page.
+	 */
+	vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND | VM_DONTDUMP;
+
+	if (!scifdev_self(ep->remote_dev))
+		vma->vm_flags |= VM_IO | VM_PFNMAP;
+
+	/* Map this range of windows */
+	err = scif_rma_list_mmap(window, start_offset, nr_pages, vma);
+	if (err) {
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %d\n", __func__, __LINE__, err);
+		goto error_unlock;
+	}
+	/* Set up the driver call back */
+	vma->vm_ops = &scif_vm_ops;
+	vma->vm_private_data = vmapvt;
+error_unlock:
+	mutex_unlock(&ep->rma_info.rma_lock);
+	if (err) {
+		kfree(vmapvt);
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %d\n", __func__, __LINE__, err);
+		scif_delete_vma(ep, vma);
+	}
+	return err;
+}
diff --git a/drivers/misc/mic/scif/scif_nm.c b/drivers/misc/mic/scif/scif_nm.c
new file mode 100644
index 000000000..79f26a02a
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_nm.c
@@ -0,0 +1,237 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include "scif_peer_bus.h"
+
+#include "scif_main.h"
+#include "scif_map.h"
+
+/**
+ * scif_invalidate_ep() - Set state for all connected endpoints
+ * to disconnected and wake up all send/recv waitqueues
+ */
+static void scif_invalidate_ep(int node)
+{
+	struct scif_endpt *ep;
+	struct list_head *pos, *tmpq;
+
+	flush_work(&scif_info.conn_work);
+	mutex_lock(&scif_info.connlock);
+	list_for_each_safe(pos, tmpq, &scif_info.disconnected) {
+		ep = list_entry(pos, struct scif_endpt, list);
+		if (ep->remote_dev->node == node) {
+			scif_unmap_all_windows(ep);
+			spin_lock(&ep->lock);
+			scif_cleanup_ep_qp(ep);
+			spin_unlock(&ep->lock);
+		}
+	}
+	list_for_each_safe(pos, tmpq, &scif_info.connected) {
+		ep = list_entry(pos, struct scif_endpt, list);
+		if (ep->remote_dev->node == node) {
+			list_del(pos);
+			spin_lock(&ep->lock);
+			ep->state = SCIFEP_DISCONNECTED;
+			list_add_tail(&ep->list, &scif_info.disconnected);
+			scif_cleanup_ep_qp(ep);
+			wake_up_interruptible(&ep->sendwq);
+			wake_up_interruptible(&ep->recvwq);
+			spin_unlock(&ep->lock);
+			scif_unmap_all_windows(ep);
+		}
+	}
+	mutex_unlock(&scif_info.connlock);
+}
+
+void scif_free_qp(struct scif_dev *scifdev)
+{
+	struct scif_qp *qp = scifdev->qpairs;
+
+	if (!qp)
+		return;
+	scif_unmap_single(qp->local_buf, scifdev, qp->inbound_q.size);
+	kfree(qp->inbound_q.rb_base);
+	scif_unmap_single(qp->local_qp, scifdev, sizeof(struct scif_qp));
+	kfree(scifdev->qpairs);
+	scifdev->qpairs = NULL;
+}
+
+static void scif_cleanup_qp(struct scif_dev *dev)
+{
+	struct scif_qp *qp = &dev->qpairs[0];
+
+	if (!qp)
+		return;
+	scif_iounmap((void *)qp->remote_qp, sizeof(struct scif_qp), dev);
+	scif_iounmap((void *)qp->outbound_q.rb_base,
+		     sizeof(struct scif_qp), dev);
+	qp->remote_qp = NULL;
+	qp->local_write = 0;
+	qp->inbound_q.current_write_offset = 0;
+	qp->inbound_q.current_read_offset = 0;
+	if (scifdev_is_p2p(dev))
+		scif_free_qp(dev);
+}
+
+void scif_send_acks(struct scif_dev *dev)
+{
+	struct scifmsg msg;
+
+	if (dev->node_remove_ack_pending) {
+		msg.uop = SCIF_NODE_REMOVE_ACK;
+		msg.src.node = scif_info.nodeid;
+		msg.dst.node = SCIF_MGMT_NODE;
+		msg.payload[0] = dev->node;
+		scif_nodeqp_send(&scif_dev[SCIF_MGMT_NODE], &msg);
+		dev->node_remove_ack_pending = false;
+	}
+	if (dev->exit_ack_pending) {
+		msg.uop = SCIF_EXIT_ACK;
+		msg.src.node = scif_info.nodeid;
+		msg.dst.node = dev->node;
+		scif_nodeqp_send(dev, &msg);
+		dev->exit_ack_pending = false;
+	}
+}
+
+/*
+ * scif_cleanup_scifdev
+ *
+ * @dev: Remote SCIF device.
+ * Uninitialize SCIF data structures for remote SCIF device.
+ */
+void scif_cleanup_scifdev(struct scif_dev *dev)
+{
+	struct scif_hw_dev *sdev = dev->sdev;
+
+	if (!dev->sdev)
+		return;
+	if (scifdev_is_p2p(dev)) {
+		if (dev->cookie) {
+			sdev->hw_ops->free_irq(sdev, dev->cookie, dev);
+			dev->cookie = NULL;
+		}
+		scif_destroy_intr_wq(dev);
+	}
+	flush_work(&scif_info.misc_work);
+	scif_destroy_p2p(dev);
+	scif_invalidate_ep(dev->node);
+	scif_zap_mmaps(dev->node);
+	scif_cleanup_rma_for_zombies(dev->node);
+	flush_work(&scif_info.misc_work);
+	scif_send_acks(dev);
+	if (!dev->node && scif_info.card_initiated_exit) {
+		/*
+		 * Send an SCIF_EXIT message which is the last message from MIC
+		 * to the Host and wait for a SCIF_EXIT_ACK
+		 */
+		scif_send_exit(dev);
+		scif_info.card_initiated_exit = false;
+	}
+	scif_cleanup_qp(dev);
+}
+
+/*
+ * scif_remove_node:
+ *
+ * @node: Node to remove
+ */
+void scif_handle_remove_node(int node)
+{
+	struct scif_dev *scifdev = &scif_dev[node];
+
+	if (scif_peer_unregister_device(scifdev))
+		scif_send_acks(scifdev);
+}
+
+static int scif_send_rmnode_msg(int node, int remove_node)
+{
+	struct scifmsg notif_msg;
+	struct scif_dev *dev = &scif_dev[node];
+
+	notif_msg.uop = SCIF_NODE_REMOVE;
+	notif_msg.src.node = scif_info.nodeid;
+	notif_msg.dst.node = node;
+	notif_msg.payload[0] = remove_node;
+	return scif_nodeqp_send(dev, &notif_msg);
+}
+
+/**
+ * scif_node_disconnect:
+ *
+ * @node_id[in]: source node id.
+ * @mgmt_initiated: Disconnection initiated from the mgmt node
+ *
+ * Disconnect a node from the scif network.
+ */
+void scif_disconnect_node(u32 node_id, bool mgmt_initiated)
+{
+	int ret;
+	int msg_cnt = 0;
+	u32 i = 0;
+	struct scif_dev *scifdev = &scif_dev[node_id];
+
+	if (!node_id)
+		return;
+
+	atomic_set(&scifdev->disconn_rescnt, 0);
+
+	/* Destroy p2p network */
+	for (i = 1; i <= scif_info.maxid; i++) {
+		if (i == node_id)
+			continue;
+		ret = scif_send_rmnode_msg(i, node_id);
+		if (!ret)
+			msg_cnt++;
+	}
+	/* Wait for the remote nodes to respond with SCIF_NODE_REMOVE_ACK */
+	ret = wait_event_timeout(scifdev->disconn_wq,
+				 (atomic_read(&scifdev->disconn_rescnt)
+				 == msg_cnt), SCIF_NODE_ALIVE_TIMEOUT);
+	/* Tell the card to clean up */
+	if (mgmt_initiated && _scifdev_alive(scifdev))
+		/*
+		 * Send an SCIF_EXIT message which is the last message from Host
+		 * to the MIC and wait for a SCIF_EXIT_ACK
+		 */
+		scif_send_exit(scifdev);
+	atomic_set(&scifdev->disconn_rescnt, 0);
+	/* Tell the mgmt node to clean up */
+	ret = scif_send_rmnode_msg(SCIF_MGMT_NODE, node_id);
+	if (!ret)
+		/* Wait for mgmt node to respond with SCIF_NODE_REMOVE_ACK */
+		wait_event_timeout(scifdev->disconn_wq,
+				   (atomic_read(&scifdev->disconn_rescnt) == 1),
+				   SCIF_NODE_ALIVE_TIMEOUT);
+}
+
+void scif_get_node_info(void)
+{
+	struct scifmsg msg;
+	DECLARE_COMPLETION_ONSTACK(node_info);
+
+	msg.uop = SCIF_GET_NODE_INFO;
+	msg.src.node = scif_info.nodeid;
+	msg.dst.node = SCIF_MGMT_NODE;
+	msg.payload[3] = (u64)&node_info;
+
+	if ((scif_nodeqp_send(&scif_dev[SCIF_MGMT_NODE], &msg)))
+		return;
+
+	/* Wait for a response with SCIF_GET_NODE_INFO */
+	wait_for_completion(&node_info);
+}
diff --git a/drivers/misc/mic/scif/scif_nodeqp.c b/drivers/misc/mic/scif/scif_nodeqp.c
new file mode 100644
index 000000000..c66ca1a58
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_nodeqp.c
@@ -0,0 +1,1354 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include "../bus/scif_bus.h"
+#include "scif_peer_bus.h"
+#include "scif_main.h"
+#include "scif_nodeqp.h"
+#include "scif_map.h"
+
+/*
+ ************************************************************************
+ * SCIF node Queue Pair (QP) setup flow:
+ *
+ * 1) SCIF driver gets probed with a scif_hw_dev via the scif_hw_bus
+ * 2) scif_setup_qp(..) allocates the local qp and calls
+ *	scif_setup_qp_connect(..) which allocates and maps the local
+ *	buffer for the inbound QP
+ * 3) The local node updates the device page with the DMA address of the QP
+ * 4) A delayed work is scheduled (qp_dwork) which periodically reads if
+ *	the peer node has updated its QP DMA address
+ * 5) Once a valid non zero address is found in the QP DMA address field
+ *	in the device page, the local node maps the remote node's QP,
+ *	updates its outbound QP and sends a SCIF_INIT message to the peer
+ * 6) The SCIF_INIT message is received by the peer node QP interrupt bottom
+ *	half handler by calling scif_init(..)
+ * 7) scif_init(..) registers a new SCIF peer node by calling
+ *	scif_peer_register_device(..) which signifies the addition of a new
+ *	SCIF node
+ * 8) On the mgmt node, P2P network setup/teardown is initiated if all the
+ *	remote nodes are online via scif_p2p_setup(..)
+ * 9) For P2P setup, the host maps the remote nodes' aperture and memory
+ *	bars and sends a SCIF_NODE_ADD message to both nodes
+ * 10) As part of scif_nodeadd, both nodes set up their local inbound
+ *	QPs and send a SCIF_NODE_ADD_ACK to the mgmt node
+ * 11) As part of scif_node_add_ack(..) the mgmt node forwards the
+ *	SCIF_NODE_ADD_ACK to the remote nodes
+ * 12) As part of scif_node_add_ack(..) the remote nodes update their
+ *	outbound QPs, make sure they can access memory on the remote node
+ *	and then add a new SCIF peer node by calling
+ *	scif_peer_register_device(..) which signifies the addition of a new
+ *	SCIF node.
+ * 13) The SCIF network is now established across all nodes.
+ *
+ ************************************************************************
+ * SCIF node QP teardown flow (initiated by non mgmt node):
+ *
+ * 1) SCIF driver gets a remove callback with a scif_hw_dev via the scif_hw_bus
+ * 2) The device page QP DMA address field is updated with 0x0
+ * 3) A non mgmt node now cleans up all local data structures and sends a
+ *	SCIF_EXIT message to the peer and waits for a SCIF_EXIT_ACK
+ * 4) As part of scif_exit(..) handling scif_disconnect_node(..) is called
+ * 5) scif_disconnect_node(..) sends a SCIF_NODE_REMOVE message to all the
+ *	peers and waits for a SCIF_NODE_REMOVE_ACK
+ * 6) As part of scif_node_remove(..) a remote node unregisters the peer
+ *	node from the SCIF network and sends a SCIF_NODE_REMOVE_ACK
+ * 7) When the mgmt node has received all the SCIF_NODE_REMOVE_ACKs
+ *	it sends itself a node remove message whose handling cleans up local
+ *	data structures and unregisters the peer node from the SCIF network
+ * 8) The mgmt node sends a SCIF_EXIT_ACK
+ * 9) Upon receipt of the SCIF_EXIT_ACK the node initiating the teardown
+ *	completes the SCIF remove routine
+ * 10) The SCIF network is now torn down for the node initiating the
+ *	teardown sequence
+ *
+ ************************************************************************
+ * SCIF node QP teardown flow (initiated by mgmt node):
+ *
+ * 1) SCIF driver gets a remove callback with a scif_hw_dev via the scif_hw_bus
+ * 2) The device page QP DMA address field is updated with 0x0
+ * 3) The mgmt node calls scif_disconnect_node(..)
+ * 4) scif_disconnect_node(..) sends a SCIF_NODE_REMOVE message to all the peers
+ *	and waits for a SCIF_NODE_REMOVE_ACK
+ * 5) As part of scif_node_remove(..) a remote node unregisters the peer
+ *	node from the SCIF network and sends a SCIF_NODE_REMOVE_ACK
+ * 6) When the mgmt node has received all the SCIF_NODE_REMOVE_ACKs
+ *	it unregisters the peer node from the SCIF network
+ * 7) The mgmt node sends a SCIF_EXIT message and waits for a SCIF_EXIT_ACK.
+ * 8) A non mgmt node upon receipt of a SCIF_EXIT message calls scif_stop(..)
+ *	which would clean up local data structures for all SCIF nodes and
+ *	then send a SCIF_EXIT_ACK back to the mgmt node
+ * 9) Upon receipt of the SCIF_EXIT_ACK the the mgmt node sends itself a node
+ *	remove message whose handling cleans up local data structures and
+ *	destroys any P2P mappings.
+ * 10) The SCIF hardware device for which a remove callback was received is now
+ *	disconnected from the SCIF network.
+ */
+/*
+ * Initializes "local" data structures for the QP. Allocates the QP
+ * ring buffer (rb) and initializes the "in bound" queue.
+ */
+int scif_setup_qp_connect(struct scif_qp *qp, dma_addr_t *qp_offset,
+			  int local_size, struct scif_dev *scifdev)
+{
+	void *local_q = qp->inbound_q.rb_base;
+	int err = 0;
+	u32 tmp_rd = 0;
+
+	spin_lock_init(&qp->send_lock);
+	spin_lock_init(&qp->recv_lock);
+
+	/* Allocate rb only if not already allocated */
+	if (!local_q) {
+		local_q = kzalloc(local_size, GFP_KERNEL);
+		if (!local_q) {
+			err = -ENOMEM;
+			return err;
+		}
+	}
+
+	err = scif_map_single(&qp->local_buf, local_q, scifdev, local_size);
+	if (err)
+		goto kfree;
+	/*
+	 * To setup the inbound_q, the buffer lives locally, the read pointer
+	 * is remote and the write pointer is local.
+	 */
+	scif_rb_init(&qp->inbound_q,
+		     &tmp_rd,
+		     &qp->local_write,
+		     local_q, get_count_order(local_size));
+	/*
+	 * The read pointer is NULL initially and it is unsafe to use the ring
+	 * buffer til this changes!
+	 */
+	qp->inbound_q.read_ptr = NULL;
+	err = scif_map_single(qp_offset, qp,
+			      scifdev, sizeof(struct scif_qp));
+	if (err)
+		goto unmap;
+	qp->local_qp = *qp_offset;
+	return err;
+unmap:
+	scif_unmap_single(qp->local_buf, scifdev, local_size);
+	qp->local_buf = 0;
+kfree:
+	kfree(local_q);
+	return err;
+}
+
+/* When the other side has already done it's allocation, this is called */
+int scif_setup_qp_accept(struct scif_qp *qp, dma_addr_t *qp_offset,
+			 dma_addr_t phys, int local_size,
+			 struct scif_dev *scifdev)
+{
+	void *local_q;
+	void *remote_q;
+	struct scif_qp *remote_qp;
+	int remote_size;
+	int err = 0;
+
+	spin_lock_init(&qp->send_lock);
+	spin_lock_init(&qp->recv_lock);
+	/* Start by figuring out where we need to point */
+	remote_qp = scif_ioremap(phys, sizeof(struct scif_qp), scifdev);
+	if (!remote_qp)
+		return -EIO;
+	qp->remote_qp = remote_qp;
+	if (qp->remote_qp->magic != SCIFEP_MAGIC) {
+		err = -EIO;
+		goto iounmap;
+	}
+	qp->remote_buf = remote_qp->local_buf;
+	remote_size = qp->remote_qp->inbound_q.size;
+	remote_q = scif_ioremap(qp->remote_buf, remote_size, scifdev);
+	if (!remote_q) {
+		err = -EIO;
+		goto iounmap;
+	}
+	qp->remote_qp->local_write = 0;
+	/*
+	 * To setup the outbound_q, the buffer lives in remote memory,
+	 * the read pointer is local, the write pointer is remote
+	 */
+	scif_rb_init(&qp->outbound_q,
+		     &qp->local_read,
+		     &qp->remote_qp->local_write,
+		     remote_q,
+		     get_count_order(remote_size));
+	local_q = kzalloc(local_size, GFP_KERNEL);
+	if (!local_q) {
+		err = -ENOMEM;
+		goto iounmap_1;
+	}
+	err = scif_map_single(&qp->local_buf, local_q, scifdev, local_size);
+	if (err)
+		goto kfree;
+	qp->remote_qp->local_read = 0;
+	/*
+	 * To setup the inbound_q, the buffer lives locally, the read pointer
+	 * is remote and the write pointer is local
+	 */
+	scif_rb_init(&qp->inbound_q,
+		     &qp->remote_qp->local_read,
+		     &qp->local_write,
+		     local_q, get_count_order(local_size));
+	err = scif_map_single(qp_offset, qp, scifdev,
+			      sizeof(struct scif_qp));
+	if (err)
+		goto unmap;
+	qp->local_qp = *qp_offset;
+	return err;
+unmap:
+	scif_unmap_single(qp->local_buf, scifdev, local_size);
+	qp->local_buf = 0;
+kfree:
+	kfree(local_q);
+iounmap_1:
+	scif_iounmap(remote_q, remote_size, scifdev);
+	qp->outbound_q.rb_base = NULL;
+iounmap:
+	scif_iounmap(qp->remote_qp, sizeof(struct scif_qp), scifdev);
+	qp->remote_qp = NULL;
+	return err;
+}
+
+int scif_setup_qp_connect_response(struct scif_dev *scifdev,
+				   struct scif_qp *qp, u64 payload)
+{
+	int err = 0;
+	void *r_buf;
+	int remote_size;
+	phys_addr_t tmp_phys;
+
+	qp->remote_qp = scif_ioremap(payload, sizeof(struct scif_qp), scifdev);
+
+	if (!qp->remote_qp) {
+		err = -ENOMEM;
+		goto error;
+	}
+
+	if (qp->remote_qp->magic != SCIFEP_MAGIC) {
+		dev_err(&scifdev->sdev->dev,
+			"SCIFEP_MAGIC mismatch between self %d remote %d\n",
+			scif_dev[scif_info.nodeid].node, scifdev->node);
+		err = -ENODEV;
+		goto error;
+	}
+
+	tmp_phys = qp->remote_qp->local_buf;
+	remote_size = qp->remote_qp->inbound_q.size;
+	r_buf = scif_ioremap(tmp_phys, remote_size, scifdev);
+
+	if (!r_buf)
+		return -EIO;
+
+	qp->local_read = 0;
+	scif_rb_init(&qp->outbound_q,
+		     &qp->local_read,
+		     &qp->remote_qp->local_write,
+		     r_buf,
+		     get_count_order(remote_size));
+	/*
+	 * Because the node QP may already be processing an INIT message, set
+	 * the read pointer so the cached read offset isn't lost
+	 */
+	qp->remote_qp->local_read = qp->inbound_q.current_read_offset;
+	/*
+	 * resetup the inbound_q now that we know where the
+	 * inbound_read really is.
+	 */
+	scif_rb_init(&qp->inbound_q,
+		     &qp->remote_qp->local_read,
+		     &qp->local_write,
+		     qp->inbound_q.rb_base,
+		     get_count_order(qp->inbound_q.size));
+error:
+	return err;
+}
+
+static __always_inline void
+scif_send_msg_intr(struct scif_dev *scifdev)
+{
+	struct scif_hw_dev *sdev = scifdev->sdev;
+
+	if (scifdev_is_p2p(scifdev))
+		sdev->hw_ops->send_p2p_intr(sdev, scifdev->rdb, &scifdev->mmio);
+	else
+		sdev->hw_ops->send_intr(sdev, scifdev->rdb);
+}
+
+int scif_qp_response(phys_addr_t phys, struct scif_dev *scifdev)
+{
+	int err = 0;
+	struct scifmsg msg;
+
+	err = scif_setup_qp_connect_response(scifdev, scifdev->qpairs, phys);
+	if (!err) {
+		/*
+		 * Now that everything is setup and mapped, we're ready
+		 * to tell the peer about our queue's location
+		 */
+		msg.uop = SCIF_INIT;
+		msg.dst.node = scifdev->node;
+		err = scif_nodeqp_send(scifdev, &msg);
+	}
+	return err;
+}
+
+void scif_send_exit(struct scif_dev *scifdev)
+{
+	struct scifmsg msg;
+	int ret;
+
+	scifdev->exit = OP_IN_PROGRESS;
+	msg.uop = SCIF_EXIT;
+	msg.src.node = scif_info.nodeid;
+	msg.dst.node = scifdev->node;
+	ret = scif_nodeqp_send(scifdev, &msg);
+	if (ret)
+		goto done;
+	/* Wait for a SCIF_EXIT_ACK message */
+	wait_event_timeout(scif_info.exitwq, scifdev->exit == OP_COMPLETED,
+			   SCIF_NODE_ALIVE_TIMEOUT);
+done:
+	scifdev->exit = OP_IDLE;
+}
+
+int scif_setup_qp(struct scif_dev *scifdev)
+{
+	int err = 0;
+	int local_size;
+	struct scif_qp *qp;
+
+	local_size = SCIF_NODE_QP_SIZE;
+
+	qp = kzalloc(sizeof(*qp), GFP_KERNEL);
+	if (!qp) {
+		err = -ENOMEM;
+		return err;
+	}
+	qp->magic = SCIFEP_MAGIC;
+	scifdev->qpairs = qp;
+	err = scif_setup_qp_connect(qp, &scifdev->qp_dma_addr,
+				    local_size, scifdev);
+	if (err)
+		goto free_qp;
+	/*
+	 * We're as setup as we can be. The inbound_q is setup, w/o a usable
+	 * outbound q.  When we get a message, the read_ptr will be updated,
+	 * and we will pull the message.
+	 */
+	return err;
+free_qp:
+	kfree(scifdev->qpairs);
+	scifdev->qpairs = NULL;
+	return err;
+}
+
+static void scif_p2p_freesg(struct scatterlist *sg)
+{
+	kfree(sg);
+}
+
+static struct scatterlist *
+scif_p2p_setsg(phys_addr_t pa, int page_size, int page_cnt)
+{
+	struct scatterlist *sg;
+	struct page *page;
+	int i;
+
+	sg = kcalloc(page_cnt, sizeof(struct scatterlist), GFP_KERNEL);
+	if (!sg)
+		return NULL;
+	sg_init_table(sg, page_cnt);
+	for (i = 0; i < page_cnt; i++) {
+		page = pfn_to_page(pa >> PAGE_SHIFT);
+		sg_set_page(&sg[i], page, page_size, 0);
+		pa += page_size;
+	}
+	return sg;
+}
+
+/* Init p2p mappings required to access peerdev from scifdev */
+static struct scif_p2p_info *
+scif_init_p2p_info(struct scif_dev *scifdev, struct scif_dev *peerdev)
+{
+	struct scif_p2p_info *p2p;
+	int num_mmio_pages, num_aper_pages, sg_page_shift, err, num_aper_chunks;
+	struct scif_hw_dev *psdev = peerdev->sdev;
+	struct scif_hw_dev *sdev = scifdev->sdev;
+
+	num_mmio_pages = psdev->mmio->len >> PAGE_SHIFT;
+	num_aper_pages = psdev->aper->len >> PAGE_SHIFT;
+
+	p2p = kzalloc(sizeof(*p2p), GFP_KERNEL);
+	if (!p2p)
+		return NULL;
+	p2p->ppi_sg[SCIF_PPI_MMIO] = scif_p2p_setsg(psdev->mmio->pa,
+						    PAGE_SIZE, num_mmio_pages);
+	if (!p2p->ppi_sg[SCIF_PPI_MMIO])
+		goto free_p2p;
+	p2p->sg_nentries[SCIF_PPI_MMIO] = num_mmio_pages;
+	sg_page_shift = get_order(min(psdev->aper->len, (u64)(1 << 30)));
+	num_aper_chunks = num_aper_pages >> (sg_page_shift - PAGE_SHIFT);
+	p2p->ppi_sg[SCIF_PPI_APER] = scif_p2p_setsg(psdev->aper->pa,
+						    1 << sg_page_shift,
+						    num_aper_chunks);
+	p2p->sg_nentries[SCIF_PPI_APER] = num_aper_chunks;
+	err = dma_map_sg(&sdev->dev, p2p->ppi_sg[SCIF_PPI_MMIO],
+			 num_mmio_pages, PCI_DMA_BIDIRECTIONAL);
+	if (err != num_mmio_pages)
+		goto scif_p2p_free;
+	err = dma_map_sg(&sdev->dev, p2p->ppi_sg[SCIF_PPI_APER],
+			 num_aper_chunks, PCI_DMA_BIDIRECTIONAL);
+	if (err != num_aper_chunks)
+		goto dma_unmap;
+	p2p->ppi_da[SCIF_PPI_MMIO] = sg_dma_address(p2p->ppi_sg[SCIF_PPI_MMIO]);
+	p2p->ppi_da[SCIF_PPI_APER] = sg_dma_address(p2p->ppi_sg[SCIF_PPI_APER]);
+	p2p->ppi_len[SCIF_PPI_MMIO] = num_mmio_pages;
+	p2p->ppi_len[SCIF_PPI_APER] = num_aper_pages;
+	p2p->ppi_peer_id = peerdev->node;
+	return p2p;
+dma_unmap:
+	dma_unmap_sg(&sdev->dev, p2p->ppi_sg[SCIF_PPI_MMIO],
+		     p2p->sg_nentries[SCIF_PPI_MMIO], DMA_BIDIRECTIONAL);
+scif_p2p_free:
+	scif_p2p_freesg(p2p->ppi_sg[SCIF_PPI_MMIO]);
+	scif_p2p_freesg(p2p->ppi_sg[SCIF_PPI_APER]);
+free_p2p:
+	kfree(p2p);
+	return NULL;
+}
+
+/* Uninitialize and release resources from a p2p mapping */
+static void scif_deinit_p2p_info(struct scif_dev *scifdev,
+				 struct scif_p2p_info *p2p)
+{
+	struct scif_hw_dev *sdev = scifdev->sdev;
+
+	dma_unmap_sg(&sdev->dev, p2p->ppi_sg[SCIF_PPI_MMIO],
+		     p2p->sg_nentries[SCIF_PPI_MMIO], DMA_BIDIRECTIONAL);
+	dma_unmap_sg(&sdev->dev, p2p->ppi_sg[SCIF_PPI_APER],
+		     p2p->sg_nentries[SCIF_PPI_APER], DMA_BIDIRECTIONAL);
+	scif_p2p_freesg(p2p->ppi_sg[SCIF_PPI_MMIO]);
+	scif_p2p_freesg(p2p->ppi_sg[SCIF_PPI_APER]);
+	kfree(p2p);
+}
+
+/**
+ * scif_node_connect: Respond to SCIF_NODE_CONNECT interrupt message
+ * @dst: Destination node
+ *
+ * Connect the src and dst node by setting up the p2p connection
+ * between them. Management node here acts like a proxy.
+ */
+static void scif_node_connect(struct scif_dev *scifdev, int dst)
+{
+	struct scif_dev *dev_j = scifdev;
+	struct scif_dev *dev_i = NULL;
+	struct scif_p2p_info *p2p_ij = NULL;    /* bus addr for j from i */
+	struct scif_p2p_info *p2p_ji = NULL;    /* bus addr for i from j */
+	struct scif_p2p_info *p2p;
+	struct list_head *pos, *tmp;
+	struct scifmsg msg;
+	int err;
+	u64 tmppayload;
+
+	if (dst < 1 || dst > scif_info.maxid)
+		return;
+
+	dev_i = &scif_dev[dst];
+
+	if (!_scifdev_alive(dev_i))
+		return;
+	/*
+	 * If the p2p connection is already setup or in the process of setting
+	 * up then just ignore this request. The requested node will get
+	 * informed by SCIF_NODE_ADD_ACK or SCIF_NODE_ADD_NACK
+	 */
+	if (!list_empty(&dev_i->p2p)) {
+		list_for_each_safe(pos, tmp, &dev_i->p2p) {
+			p2p = list_entry(pos, struct scif_p2p_info, ppi_list);
+			if (p2p->ppi_peer_id == dev_j->node)
+				return;
+		}
+	}
+	p2p_ij = scif_init_p2p_info(dev_i, dev_j);
+	if (!p2p_ij)
+		return;
+	p2p_ji = scif_init_p2p_info(dev_j, dev_i);
+	if (!p2p_ji) {
+		scif_deinit_p2p_info(dev_i, p2p_ij);
+		return;
+	}
+	list_add_tail(&p2p_ij->ppi_list, &dev_i->p2p);
+	list_add_tail(&p2p_ji->ppi_list, &dev_j->p2p);
+
+	/*
+	 * Send a SCIF_NODE_ADD to dev_i, pass it its bus address
+	 * as seen from dev_j
+	 */
+	msg.uop = SCIF_NODE_ADD;
+	msg.src.node = dev_j->node;
+	msg.dst.node = dev_i->node;
+
+	msg.payload[0] = p2p_ji->ppi_da[SCIF_PPI_APER];
+	msg.payload[1] = p2p_ij->ppi_da[SCIF_PPI_MMIO];
+	msg.payload[2] = p2p_ij->ppi_da[SCIF_PPI_APER];
+	msg.payload[3] = p2p_ij->ppi_len[SCIF_PPI_APER] << PAGE_SHIFT;
+
+	err = scif_nodeqp_send(dev_i,  &msg);
+	if (err) {
+		dev_err(&scifdev->sdev->dev,
+			"%s %d error %d\n", __func__, __LINE__, err);
+		return;
+	}
+
+	/* Same as above but to dev_j */
+	msg.uop = SCIF_NODE_ADD;
+	msg.src.node = dev_i->node;
+	msg.dst.node = dev_j->node;
+
+	tmppayload = msg.payload[0];
+	msg.payload[0] = msg.payload[2];
+	msg.payload[2] = tmppayload;
+	msg.payload[1] = p2p_ji->ppi_da[SCIF_PPI_MMIO];
+	msg.payload[3] = p2p_ji->ppi_len[SCIF_PPI_APER] << PAGE_SHIFT;
+
+	scif_nodeqp_send(dev_j, &msg);
+}
+
+static void scif_p2p_setup(void)
+{
+	int i, j;
+
+	if (!scif_info.p2p_enable)
+		return;
+
+	for (i = 1; i <= scif_info.maxid; i++)
+		if (!_scifdev_alive(&scif_dev[i]))
+			return;
+
+	for (i = 1; i <= scif_info.maxid; i++) {
+		for (j = 1; j <= scif_info.maxid; j++) {
+			struct scif_dev *scifdev = &scif_dev[i];
+
+			if (i == j)
+				continue;
+			scif_node_connect(scifdev, j);
+		}
+	}
+}
+
+static char *message_types[] = {"BAD",
+				"INIT",
+				"EXIT",
+				"SCIF_EXIT_ACK",
+				"SCIF_NODE_ADD",
+				"SCIF_NODE_ADD_ACK",
+				"SCIF_NODE_ADD_NACK",
+				"REMOVE_NODE",
+				"REMOVE_NODE_ACK",
+				"CNCT_REQ",
+				"CNCT_GNT",
+				"CNCT_GNTACK",
+				"CNCT_GNTNACK",
+				"CNCT_REJ",
+				"DISCNCT",
+				"DISCNT_ACK",
+				"CLIENT_SENT",
+				"CLIENT_RCVD",
+				"SCIF_GET_NODE_INFO",
+				"REGISTER",
+				"REGISTER_ACK",
+				"REGISTER_NACK",
+				"UNREGISTER",
+				"UNREGISTER_ACK",
+				"UNREGISTER_NACK",
+				"ALLOC_REQ",
+				"ALLOC_GNT",
+				"ALLOC_REJ",
+				"FREE_PHYS",
+				"FREE_VIRT",
+				"MUNMAP",
+				"MARK",
+				"MARK_ACK",
+				"MARK_NACK",
+				"WAIT",
+				"WAIT_ACK",
+				"WAIT_NACK",
+				"SIGNAL_LOCAL",
+				"SIGNAL_REMOTE",
+				"SIG_ACK",
+				"SIG_NACK"};
+
+static void
+scif_display_message(struct scif_dev *scifdev, struct scifmsg *msg,
+		     const char *label)
+{
+	if (!scif_info.en_msg_log)
+		return;
+	if (msg->uop > SCIF_MAX_MSG) {
+		dev_err(&scifdev->sdev->dev,
+			"%s: unknown msg type %d\n", label, msg->uop);
+		return;
+	}
+	dev_info(&scifdev->sdev->dev,
+		 "%s: msg type %s, src %d:%d, dest %d:%d payload 0x%llx:0x%llx:0x%llx:0x%llx\n",
+		 label, message_types[msg->uop], msg->src.node, msg->src.port,
+		 msg->dst.node, msg->dst.port, msg->payload[0], msg->payload[1],
+		 msg->payload[2], msg->payload[3]);
+}
+
+int _scif_nodeqp_send(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_qp *qp = scifdev->qpairs;
+	int err = -ENOMEM, loop_cnt = 0;
+
+	scif_display_message(scifdev, msg, "Sent");
+	if (!qp) {
+		err = -EINVAL;
+		goto error;
+	}
+	spin_lock(&qp->send_lock);
+
+	while ((err = scif_rb_write(&qp->outbound_q,
+				    msg, sizeof(struct scifmsg)))) {
+		mdelay(1);
+#define SCIF_NODEQP_SEND_TO_MSEC (3 * 1000)
+		if (loop_cnt++ > (SCIF_NODEQP_SEND_TO_MSEC)) {
+			err = -ENODEV;
+			break;
+		}
+	}
+	if (!err)
+		scif_rb_commit(&qp->outbound_q);
+	spin_unlock(&qp->send_lock);
+	if (!err) {
+		if (scifdev_self(scifdev))
+			/*
+			 * For loopback we need to emulate an interrupt by
+			 * queuing work for the queue handling real node
+			 * Qp interrupts.
+			 */
+			queue_work(scifdev->intr_wq, &scifdev->intr_bh);
+		else
+			scif_send_msg_intr(scifdev);
+	}
+error:
+	if (err)
+		dev_dbg(&scifdev->sdev->dev,
+			"%s %d error %d uop %d\n",
+			 __func__, __LINE__, err, msg->uop);
+	return err;
+}
+
+/**
+ * scif_nodeqp_send - Send a message on the node queue pair
+ * @scifdev: Scif Device.
+ * @msg: The message to be sent.
+ */
+int scif_nodeqp_send(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	int err;
+	struct device *spdev = NULL;
+
+	if (msg->uop > SCIF_EXIT_ACK) {
+		/* Dont send messages once the exit flow has begun */
+		if (OP_IDLE != scifdev->exit)
+			return -ENODEV;
+		spdev = scif_get_peer_dev(scifdev);
+		if (IS_ERR(spdev)) {
+			err = PTR_ERR(spdev);
+			return err;
+		}
+	}
+	err = _scif_nodeqp_send(scifdev, msg);
+	if (msg->uop > SCIF_EXIT_ACK)
+		scif_put_peer_dev(spdev);
+	return err;
+}
+
+/*
+ * scif_misc_handler:
+ *
+ * Work queue handler for servicing miscellaneous SCIF tasks.
+ * Examples include:
+ * 1) Remote fence requests.
+ * 2) Destruction of temporary registered windows
+ *    created during scif_vreadfrom()/scif_vwriteto().
+ * 3) Cleanup of zombie endpoints.
+ */
+void scif_misc_handler(struct work_struct *work)
+{
+	scif_rma_handle_remote_fences();
+	scif_rma_destroy_windows();
+	scif_rma_destroy_tcw_invalid();
+	scif_cleanup_zombie_epd();
+}
+
+/**
+ * scif_init() - Respond to SCIF_INIT interrupt message
+ * @scifdev:    Remote SCIF device node
+ * @msg:        Interrupt message
+ */
+static __always_inline void
+scif_init(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	/*
+	 * Allow the thread waiting for device page updates for the peer QP DMA
+	 * address to complete initializing the inbound_q.
+	 */
+	flush_delayed_work(&scifdev->qp_dwork);
+
+	scif_peer_register_device(scifdev);
+
+	if (scif_is_mgmt_node()) {
+		mutex_lock(&scif_info.conflock);
+		scif_p2p_setup();
+		mutex_unlock(&scif_info.conflock);
+	}
+}
+
+/**
+ * scif_exit() - Respond to SCIF_EXIT interrupt message
+ * @scifdev:    Remote SCIF device node
+ * @msg:        Interrupt message
+ *
+ * This function stops the SCIF interface for the node which sent
+ * the SCIF_EXIT message and starts waiting for that node to
+ * resetup the queue pair again.
+ */
+static __always_inline void
+scif_exit(struct scif_dev *scifdev, struct scifmsg *unused)
+{
+	scifdev->exit_ack_pending = true;
+	if (scif_is_mgmt_node())
+		scif_disconnect_node(scifdev->node, false);
+	else
+		scif_stop(scifdev);
+	schedule_delayed_work(&scifdev->qp_dwork,
+			      msecs_to_jiffies(1000));
+}
+
+/**
+ * scif_exitack() - Respond to SCIF_EXIT_ACK interrupt message
+ * @scifdev:    Remote SCIF device node
+ * @msg:        Interrupt message
+ *
+ */
+static __always_inline void
+scif_exit_ack(struct scif_dev *scifdev, struct scifmsg *unused)
+{
+	scifdev->exit = OP_COMPLETED;
+	wake_up(&scif_info.exitwq);
+}
+
+/**
+ * scif_node_add() - Respond to SCIF_NODE_ADD interrupt message
+ * @scifdev:    Remote SCIF device node
+ * @msg:        Interrupt message
+ *
+ * When the mgmt node driver has finished initializing a MIC node queue pair it
+ * marks the node as online. It then looks for all currently online MIC cards
+ * and send a SCIF_NODE_ADD message to identify the ID of the new card for
+ * peer to peer initialization
+ *
+ * The local node allocates its incoming queue and sends its address in the
+ * SCIF_NODE_ADD_ACK message back to the mgmt node, the mgmt node "reflects"
+ * this message to the new node
+ */
+static __always_inline void
+scif_node_add(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_dev *newdev;
+	dma_addr_t qp_offset;
+	int qp_connect;
+	struct scif_hw_dev *sdev;
+
+	dev_dbg(&scifdev->sdev->dev,
+		"Scifdev %d:%d received NODE_ADD msg for node %d\n",
+		scifdev->node, msg->dst.node, msg->src.node);
+	dev_dbg(&scifdev->sdev->dev,
+		"Remote address for this node's aperture %llx\n",
+		msg->payload[0]);
+	newdev = &scif_dev[msg->src.node];
+	newdev->node = msg->src.node;
+	newdev->sdev = scif_dev[SCIF_MGMT_NODE].sdev;
+	sdev = newdev->sdev;
+
+	if (scif_setup_intr_wq(newdev)) {
+		dev_err(&scifdev->sdev->dev,
+			"failed to setup interrupts for %d\n", msg->src.node);
+		goto interrupt_setup_error;
+	}
+	newdev->mmio.va = ioremap_nocache(msg->payload[1], sdev->mmio->len);
+	if (!newdev->mmio.va) {
+		dev_err(&scifdev->sdev->dev,
+			"failed to map mmio for %d\n", msg->src.node);
+		goto mmio_map_error;
+	}
+	newdev->qpairs = kzalloc(sizeof(*newdev->qpairs), GFP_KERNEL);
+	if (!newdev->qpairs)
+		goto qp_alloc_error;
+	/*
+	 * Set the base address of the remote node's memory since it gets
+	 * added to qp_offset
+	 */
+	newdev->base_addr = msg->payload[0];
+
+	qp_connect = scif_setup_qp_connect(newdev->qpairs, &qp_offset,
+					   SCIF_NODE_QP_SIZE, newdev);
+	if (qp_connect) {
+		dev_err(&scifdev->sdev->dev,
+			"failed to setup qp_connect %d\n", qp_connect);
+		goto qp_connect_error;
+	}
+
+	newdev->db = sdev->hw_ops->next_db(sdev);
+	newdev->cookie = sdev->hw_ops->request_irq(sdev, scif_intr_handler,
+						   "SCIF_INTR", newdev,
+						   newdev->db);
+	if (IS_ERR(newdev->cookie))
+		goto qp_connect_error;
+	newdev->qpairs->magic = SCIFEP_MAGIC;
+	newdev->qpairs->qp_state = SCIF_QP_OFFLINE;
+
+	msg->uop = SCIF_NODE_ADD_ACK;
+	msg->dst.node = msg->src.node;
+	msg->src.node = scif_info.nodeid;
+	msg->payload[0] = qp_offset;
+	msg->payload[2] = newdev->db;
+	scif_nodeqp_send(&scif_dev[SCIF_MGMT_NODE], msg);
+	return;
+qp_connect_error:
+	kfree(newdev->qpairs);
+	newdev->qpairs = NULL;
+qp_alloc_error:
+	iounmap(newdev->mmio.va);
+	newdev->mmio.va = NULL;
+mmio_map_error:
+interrupt_setup_error:
+	dev_err(&scifdev->sdev->dev,
+		"node add failed for node %d\n", msg->src.node);
+	msg->uop = SCIF_NODE_ADD_NACK;
+	msg->dst.node = msg->src.node;
+	msg->src.node = scif_info.nodeid;
+	scif_nodeqp_send(&scif_dev[SCIF_MGMT_NODE], msg);
+}
+
+void scif_poll_qp_state(struct work_struct *work)
+{
+#define SCIF_NODE_QP_RETRY 100
+#define SCIF_NODE_QP_TIMEOUT 100
+	struct scif_dev *peerdev = container_of(work, struct scif_dev,
+							p2p_dwork.work);
+	struct scif_qp *qp = &peerdev->qpairs[0];
+
+	if (qp->qp_state != SCIF_QP_ONLINE ||
+	    qp->remote_qp->qp_state != SCIF_QP_ONLINE) {
+		if (peerdev->p2p_retry++ == SCIF_NODE_QP_RETRY) {
+			dev_err(&peerdev->sdev->dev,
+				"Warning: QP check timeout with state %d\n",
+				qp->qp_state);
+			goto timeout;
+		}
+		schedule_delayed_work(&peerdev->p2p_dwork,
+				      msecs_to_jiffies(SCIF_NODE_QP_TIMEOUT));
+		return;
+	}
+	return;
+timeout:
+	dev_err(&peerdev->sdev->dev,
+		"%s %d remote node %d offline,  state = 0x%x\n",
+		__func__, __LINE__, peerdev->node, qp->qp_state);
+	qp->remote_qp->qp_state = SCIF_QP_OFFLINE;
+	scif_peer_unregister_device(peerdev);
+	scif_cleanup_scifdev(peerdev);
+}
+
+/**
+ * scif_node_add_ack() - Respond to SCIF_NODE_ADD_ACK interrupt message
+ * @scifdev:    Remote SCIF device node
+ * @msg:        Interrupt message
+ *
+ * After a MIC node receives the SCIF_NODE_ADD_ACK message it send this
+ * message to the mgmt node to confirm the sequence is finished.
+ *
+ */
+static __always_inline void
+scif_node_add_ack(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_dev *peerdev;
+	struct scif_qp *qp;
+	struct scif_dev *dst_dev = &scif_dev[msg->dst.node];
+
+	dev_dbg(&scifdev->sdev->dev,
+		"Scifdev %d received SCIF_NODE_ADD_ACK msg src %d dst %d\n",
+		scifdev->node, msg->src.node, msg->dst.node);
+	dev_dbg(&scifdev->sdev->dev,
+		"payload %llx %llx %llx %llx\n", msg->payload[0],
+		msg->payload[1], msg->payload[2], msg->payload[3]);
+	if (scif_is_mgmt_node()) {
+		/*
+		 * the lock serializes with scif_qp_response_ack. The mgmt node
+		 * is forwarding the NODE_ADD_ACK message from src to dst we
+		 * need to make sure that the dst has already received a
+		 * NODE_ADD for src and setup its end of the qp to dst
+		 */
+		mutex_lock(&scif_info.conflock);
+		msg->payload[1] = scif_info.maxid;
+		scif_nodeqp_send(dst_dev, msg);
+		mutex_unlock(&scif_info.conflock);
+		return;
+	}
+	peerdev = &scif_dev[msg->src.node];
+	peerdev->sdev = scif_dev[SCIF_MGMT_NODE].sdev;
+	peerdev->node = msg->src.node;
+
+	qp = &peerdev->qpairs[0];
+
+	if ((scif_setup_qp_connect_response(peerdev, &peerdev->qpairs[0],
+					    msg->payload[0])))
+		goto local_error;
+	peerdev->rdb = msg->payload[2];
+	qp->remote_qp->qp_state = SCIF_QP_ONLINE;
+
+	scif_peer_register_device(peerdev);
+
+	schedule_delayed_work(&peerdev->p2p_dwork, 0);
+	return;
+local_error:
+	scif_cleanup_scifdev(peerdev);
+}
+
+/**
+ * scif_node_add_nack: Respond to SCIF_NODE_ADD_NACK interrupt message
+ * @msg:        Interrupt message
+ *
+ * SCIF_NODE_ADD failed, so inform the waiting wq.
+ */
+static __always_inline void
+scif_node_add_nack(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	if (scif_is_mgmt_node()) {
+		struct scif_dev *dst_dev = &scif_dev[msg->dst.node];
+
+		dev_dbg(&scifdev->sdev->dev,
+			"SCIF_NODE_ADD_NACK received from %d\n", scifdev->node);
+		scif_nodeqp_send(dst_dev, msg);
+	}
+}
+
+/*
+ * scif_node_remove: Handle SCIF_NODE_REMOVE message
+ * @msg: Interrupt message
+ *
+ * Handle node removal.
+ */
+static __always_inline void
+scif_node_remove(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	int node = msg->payload[0];
+	struct scif_dev *scdev = &scif_dev[node];
+
+	scdev->node_remove_ack_pending = true;
+	scif_handle_remove_node(node);
+}
+
+/*
+ * scif_node_remove_ack: Handle SCIF_NODE_REMOVE_ACK message
+ * @msg: Interrupt message
+ *
+ * The peer has acked a SCIF_NODE_REMOVE message.
+ */
+static __always_inline void
+scif_node_remove_ack(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_dev *sdev = &scif_dev[msg->payload[0]];
+
+	atomic_inc(&sdev->disconn_rescnt);
+	wake_up(&sdev->disconn_wq);
+}
+
+/**
+ * scif_get_node_info: Respond to SCIF_GET_NODE_INFO interrupt message
+ * @msg:        Interrupt message
+ *
+ * Retrieve node info i.e maxid and total from the mgmt node.
+ */
+static __always_inline void
+scif_get_node_info_resp(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	if (scif_is_mgmt_node()) {
+		swap(msg->dst.node, msg->src.node);
+		mutex_lock(&scif_info.conflock);
+		msg->payload[1] = scif_info.maxid;
+		msg->payload[2] = scif_info.total;
+		mutex_unlock(&scif_info.conflock);
+		scif_nodeqp_send(scifdev, msg);
+	} else {
+		struct completion *node_info =
+			(struct completion *)msg->payload[3];
+
+		mutex_lock(&scif_info.conflock);
+		scif_info.maxid = msg->payload[1];
+		scif_info.total = msg->payload[2];
+		complete_all(node_info);
+		mutex_unlock(&scif_info.conflock);
+	}
+}
+
+static void
+scif_msg_unknown(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	/* Bogus Node Qp Message? */
+	dev_err(&scifdev->sdev->dev,
+		"Unknown message 0x%xn scifdev->node 0x%x\n",
+		msg->uop, scifdev->node);
+}
+
+static void (*scif_intr_func[SCIF_MAX_MSG + 1])
+	    (struct scif_dev *, struct scifmsg *msg) = {
+	scif_msg_unknown,	/* Error */
+	scif_init,		/* SCIF_INIT */
+	scif_exit,		/* SCIF_EXIT */
+	scif_exit_ack,		/* SCIF_EXIT_ACK */
+	scif_node_add,		/* SCIF_NODE_ADD */
+	scif_node_add_ack,	/* SCIF_NODE_ADD_ACK */
+	scif_node_add_nack,	/* SCIF_NODE_ADD_NACK */
+	scif_node_remove,	/* SCIF_NODE_REMOVE */
+	scif_node_remove_ack,	/* SCIF_NODE_REMOVE_ACK */
+	scif_cnctreq,		/* SCIF_CNCT_REQ */
+	scif_cnctgnt,		/* SCIF_CNCT_GNT */
+	scif_cnctgnt_ack,	/* SCIF_CNCT_GNTACK */
+	scif_cnctgnt_nack,	/* SCIF_CNCT_GNTNACK */
+	scif_cnctrej,		/* SCIF_CNCT_REJ */
+	scif_discnct,		/* SCIF_DISCNCT */
+	scif_discnt_ack,	/* SCIF_DISCNT_ACK */
+	scif_clientsend,	/* SCIF_CLIENT_SENT */
+	scif_clientrcvd,	/* SCIF_CLIENT_RCVD */
+	scif_get_node_info_resp,/* SCIF_GET_NODE_INFO */
+	scif_recv_reg,		/* SCIF_REGISTER */
+	scif_recv_reg_ack,	/* SCIF_REGISTER_ACK */
+	scif_recv_reg_nack,	/* SCIF_REGISTER_NACK */
+	scif_recv_unreg,	/* SCIF_UNREGISTER */
+	scif_recv_unreg_ack,	/* SCIF_UNREGISTER_ACK */
+	scif_recv_unreg_nack,	/* SCIF_UNREGISTER_NACK */
+	scif_alloc_req,		/* SCIF_ALLOC_REQ */
+	scif_alloc_gnt_rej,	/* SCIF_ALLOC_GNT */
+	scif_alloc_gnt_rej,	/* SCIF_ALLOC_REJ */
+	scif_free_virt,		/* SCIF_FREE_VIRT */
+	scif_recv_munmap,	/* SCIF_MUNMAP */
+	scif_recv_mark,		/* SCIF_MARK */
+	scif_recv_mark_resp,	/* SCIF_MARK_ACK */
+	scif_recv_mark_resp,	/* SCIF_MARK_NACK */
+	scif_recv_wait,		/* SCIF_WAIT */
+	scif_recv_wait_resp,	/* SCIF_WAIT_ACK */
+	scif_recv_wait_resp,	/* SCIF_WAIT_NACK */
+	scif_recv_sig_local,	/* SCIF_SIG_LOCAL */
+	scif_recv_sig_remote,	/* SCIF_SIG_REMOTE */
+	scif_recv_sig_resp,	/* SCIF_SIG_ACK */
+	scif_recv_sig_resp,	/* SCIF_SIG_NACK */
+};
+
+/**
+ * scif_nodeqp_msg_handler() - Common handler for node messages
+ * @scifdev: Remote device to respond to
+ * @qp: Remote memory pointer
+ * @msg: The message to be handled.
+ *
+ * This routine calls the appropriate routine to handle a Node Qp
+ * message receipt
+ */
+static int scif_max_msg_id = SCIF_MAX_MSG;
+
+static void
+scif_nodeqp_msg_handler(struct scif_dev *scifdev,
+			struct scif_qp *qp, struct scifmsg *msg)
+{
+	scif_display_message(scifdev, msg, "Rcvd");
+
+	if (msg->uop > (u32)scif_max_msg_id) {
+		/* Bogus Node Qp Message? */
+		dev_err(&scifdev->sdev->dev,
+			"Unknown message 0x%xn scifdev->node 0x%x\n",
+			msg->uop, scifdev->node);
+		return;
+	}
+
+	scif_intr_func[msg->uop](scifdev, msg);
+}
+
+/**
+ * scif_nodeqp_intrhandler() - Interrupt handler for node messages
+ * @scifdev:    Remote device to respond to
+ * @qp:         Remote memory pointer
+ *
+ * This routine is triggered by the interrupt mechanism.  It reads
+ * messages from the node queue RB and calls the Node QP Message handling
+ * routine.
+ */
+void scif_nodeqp_intrhandler(struct scif_dev *scifdev, struct scif_qp *qp)
+{
+	struct scifmsg msg;
+	int read_size;
+
+	do {
+		read_size = scif_rb_get_next(&qp->inbound_q, &msg, sizeof(msg));
+		if (!read_size)
+			break;
+		scif_nodeqp_msg_handler(scifdev, qp, &msg);
+		/*
+		 * The node queue pair is unmapped so skip the read pointer
+		 * update after receipt of a SCIF_EXIT_ACK
+		 */
+		if (SCIF_EXIT_ACK == msg.uop)
+			break;
+		scif_rb_update_read_ptr(&qp->inbound_q);
+	} while (1);
+}
+
+/**
+ * scif_loopb_wq_handler - Loopback Workqueue Handler.
+ * @work: loop back work
+ *
+ * This work queue routine is invoked by the loopback work queue handler.
+ * It grabs the recv lock, dequeues any available messages from the head
+ * of the loopback message list, calls the node QP message handler,
+ * waits for it to return, then frees up this message and dequeues more
+ * elements of the list if available.
+ */
+static void scif_loopb_wq_handler(struct work_struct *unused)
+{
+	struct scif_dev *scifdev = scif_info.loopb_dev;
+	struct scif_qp *qp = scifdev->qpairs;
+	struct scif_loopb_msg *msg;
+
+	do {
+		msg = NULL;
+		spin_lock(&qp->recv_lock);
+		if (!list_empty(&scif_info.loopb_recv_q)) {
+			msg = list_first_entry(&scif_info.loopb_recv_q,
+					       struct scif_loopb_msg,
+					       list);
+			list_del(&msg->list);
+		}
+		spin_unlock(&qp->recv_lock);
+
+		if (msg) {
+			scif_nodeqp_msg_handler(scifdev, qp, &msg->msg);
+			kfree(msg);
+		}
+	} while (msg);
+}
+
+/**
+ * scif_loopb_msg_handler() - Workqueue handler for loopback messages.
+ * @scifdev: SCIF device
+ * @qp: Queue pair.
+ *
+ * This work queue routine is triggered when a loopback message is received.
+ *
+ * We need special handling for receiving Node Qp messages on a loopback SCIF
+ * device via two workqueues for receiving messages.
+ *
+ * The reason we need the extra workqueue which is not required with *normal*
+ * non-loopback SCIF devices is the potential classic deadlock described below:
+ *
+ * Thread A tries to send a message on a loopback SCIF device and blocks since
+ * there is no space in the RB while it has the send_lock held or another
+ * lock called lock X for example.
+ *
+ * Thread B: The Loopback Node QP message receive workqueue receives the message
+ * and tries to send a message (eg an ACK) to the loopback SCIF device. It tries
+ * to grab the send lock again or lock X and deadlocks with Thread A. The RB
+ * cannot be drained any further due to this classic deadlock.
+ *
+ * In order to avoid deadlocks as mentioned above we have an extra level of
+ * indirection achieved by having two workqueues.
+ * 1) The first workqueue whose handler is scif_loopb_msg_handler reads
+ * messages from the Node QP RB, adds them to a list and queues work for the
+ * second workqueue.
+ *
+ * 2) The second workqueue whose handler is scif_loopb_wq_handler dequeues
+ * messages from the list, handles them, frees up the memory and dequeues
+ * more elements from the list if possible.
+ */
+int
+scif_loopb_msg_handler(struct scif_dev *scifdev, struct scif_qp *qp)
+{
+	int read_size;
+	struct scif_loopb_msg *msg;
+
+	do {
+		msg = kmalloc(sizeof(*msg), GFP_KERNEL);
+		if (!msg)
+			return -ENOMEM;
+		read_size = scif_rb_get_next(&qp->inbound_q, &msg->msg,
+					     sizeof(struct scifmsg));
+		if (read_size != sizeof(struct scifmsg)) {
+			kfree(msg);
+			scif_rb_update_read_ptr(&qp->inbound_q);
+			break;
+		}
+		spin_lock(&qp->recv_lock);
+		list_add_tail(&msg->list, &scif_info.loopb_recv_q);
+		spin_unlock(&qp->recv_lock);
+		queue_work(scif_info.loopb_wq, &scif_info.loopb_work);
+		scif_rb_update_read_ptr(&qp->inbound_q);
+	} while (read_size == sizeof(struct scifmsg));
+	return read_size;
+}
+
+/**
+ * scif_setup_loopback_qp - One time setup work for Loopback Node Qp.
+ * @scifdev: SCIF device
+ *
+ * Sets up the required loopback workqueues, queue pairs and ring buffers
+ */
+int scif_setup_loopback_qp(struct scif_dev *scifdev)
+{
+	int err = 0;
+	void *local_q;
+	struct scif_qp *qp;
+
+	err = scif_setup_intr_wq(scifdev);
+	if (err)
+		goto exit;
+	INIT_LIST_HEAD(&scif_info.loopb_recv_q);
+	snprintf(scif_info.loopb_wqname, sizeof(scif_info.loopb_wqname),
+		 "SCIF LOOPB %d", scifdev->node);
+	scif_info.loopb_wq =
+		alloc_ordered_workqueue(scif_info.loopb_wqname, 0);
+	if (!scif_info.loopb_wq) {
+		err = -ENOMEM;
+		goto destroy_intr;
+	}
+	INIT_WORK(&scif_info.loopb_work, scif_loopb_wq_handler);
+	/* Allocate Self Qpair */
+	scifdev->qpairs = kzalloc(sizeof(*scifdev->qpairs), GFP_KERNEL);
+	if (!scifdev->qpairs) {
+		err = -ENOMEM;
+		goto destroy_loopb_wq;
+	}
+
+	qp = scifdev->qpairs;
+	qp->magic = SCIFEP_MAGIC;
+	spin_lock_init(&qp->send_lock);
+	spin_lock_init(&qp->recv_lock);
+
+	local_q = kzalloc(SCIF_NODE_QP_SIZE, GFP_KERNEL);
+	if (!local_q) {
+		err = -ENOMEM;
+		goto free_qpairs;
+	}
+	/*
+	 * For loopback the inbound_q and outbound_q are essentially the same
+	 * since the Node sends a message on the loopback interface to the
+	 * outbound_q which is then received on the inbound_q.
+	 */
+	scif_rb_init(&qp->outbound_q,
+		     &qp->local_read,
+		     &qp->local_write,
+		     local_q, get_count_order(SCIF_NODE_QP_SIZE));
+
+	scif_rb_init(&qp->inbound_q,
+		     &qp->local_read,
+		     &qp->local_write,
+		     local_q, get_count_order(SCIF_NODE_QP_SIZE));
+	scif_info.nodeid = scifdev->node;
+
+	scif_peer_register_device(scifdev);
+
+	scif_info.loopb_dev = scifdev;
+	return err;
+free_qpairs:
+	kfree(scifdev->qpairs);
+destroy_loopb_wq:
+	destroy_workqueue(scif_info.loopb_wq);
+destroy_intr:
+	scif_destroy_intr_wq(scifdev);
+exit:
+	return err;
+}
+
+/**
+ * scif_destroy_loopback_qp - One time uninit work for Loopback Node Qp
+ * @scifdev: SCIF device
+ *
+ * Destroys the workqueues and frees up the Ring Buffer and Queue Pair memory.
+ */
+int scif_destroy_loopback_qp(struct scif_dev *scifdev)
+{
+	scif_peer_unregister_device(scifdev);
+	destroy_workqueue(scif_info.loopb_wq);
+	scif_destroy_intr_wq(scifdev);
+	kfree(scifdev->qpairs->outbound_q.rb_base);
+	kfree(scifdev->qpairs);
+	scifdev->sdev = NULL;
+	scif_info.loopb_dev = NULL;
+	return 0;
+}
+
+void scif_destroy_p2p(struct scif_dev *scifdev)
+{
+	struct scif_dev *peer_dev;
+	struct scif_p2p_info *p2p;
+	struct list_head *pos, *tmp;
+	int bd;
+
+	mutex_lock(&scif_info.conflock);
+	/* Free P2P mappings in the given node for all its peer nodes */
+	list_for_each_safe(pos, tmp, &scifdev->p2p) {
+		p2p = list_entry(pos, struct scif_p2p_info, ppi_list);
+		dma_unmap_sg(&scifdev->sdev->dev, p2p->ppi_sg[SCIF_PPI_MMIO],
+			     p2p->sg_nentries[SCIF_PPI_MMIO],
+			     DMA_BIDIRECTIONAL);
+		dma_unmap_sg(&scifdev->sdev->dev, p2p->ppi_sg[SCIF_PPI_APER],
+			     p2p->sg_nentries[SCIF_PPI_APER],
+			     DMA_BIDIRECTIONAL);
+		scif_p2p_freesg(p2p->ppi_sg[SCIF_PPI_MMIO]);
+		scif_p2p_freesg(p2p->ppi_sg[SCIF_PPI_APER]);
+		list_del(pos);
+		kfree(p2p);
+	}
+
+	/* Free P2P mapping created in the peer nodes for the given node */
+	for (bd = SCIF_MGMT_NODE + 1; bd <= scif_info.maxid; bd++) {
+		peer_dev = &scif_dev[bd];
+		list_for_each_safe(pos, tmp, &peer_dev->p2p) {
+			p2p = list_entry(pos, struct scif_p2p_info, ppi_list);
+			if (p2p->ppi_peer_id == scifdev->node) {
+				dma_unmap_sg(&peer_dev->sdev->dev,
+					     p2p->ppi_sg[SCIF_PPI_MMIO],
+					     p2p->sg_nentries[SCIF_PPI_MMIO],
+					     DMA_BIDIRECTIONAL);
+				dma_unmap_sg(&peer_dev->sdev->dev,
+					     p2p->ppi_sg[SCIF_PPI_APER],
+					     p2p->sg_nentries[SCIF_PPI_APER],
+					     DMA_BIDIRECTIONAL);
+				scif_p2p_freesg(p2p->ppi_sg[SCIF_PPI_MMIO]);
+				scif_p2p_freesg(p2p->ppi_sg[SCIF_PPI_APER]);
+				list_del(pos);
+				kfree(p2p);
+			}
+		}
+	}
+	mutex_unlock(&scif_info.conflock);
+}
diff --git a/drivers/misc/mic/scif/scif_nodeqp.h b/drivers/misc/mic/scif/scif_nodeqp.h
new file mode 100644
index 000000000..958962731
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_nodeqp.h
@@ -0,0 +1,221 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in
+ *   the documentation and/or other materials provided with the
+ *   distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ *   contributors may be used to endorse or promote products derived
+ *   from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#ifndef SCIF_NODEQP
+#define SCIF_NODEQP
+
+#include "scif_rb.h"
+#include "scif_peer_bus.h"
+
+#define SCIF_INIT 1  /* First message sent to the peer node for discovery */
+#define SCIF_EXIT 2  /* Last message from the peer informing intent to exit */
+#define SCIF_EXIT_ACK 3 /* Response to SCIF_EXIT message */
+#define SCIF_NODE_ADD 4  /* Tell Online nodes a new node exits */
+#define SCIF_NODE_ADD_ACK 5  /* Confirm to mgmt node sequence is finished */
+#define SCIF_NODE_ADD_NACK 6 /* SCIF_NODE_ADD failed */
+#define SCIF_NODE_REMOVE 7 /* Request to deactivate a SCIF node */
+#define SCIF_NODE_REMOVE_ACK 8 /* Response to a SCIF_NODE_REMOVE message */
+#define SCIF_CNCT_REQ 9  /* Phys addr of Request connection to a port */
+#define SCIF_CNCT_GNT 10  /* Phys addr of new Grant connection request */
+#define SCIF_CNCT_GNTACK 11  /* Error type Reject a connection request */
+#define SCIF_CNCT_GNTNACK 12  /* Error type Reject a connection request */
+#define SCIF_CNCT_REJ 13  /* Error type Reject a connection request */
+#define SCIF_DISCNCT 14 /* Notify peer that connection is being terminated */
+#define SCIF_DISCNT_ACK 15 /* Notify peer that connection is being terminated */
+#define SCIF_CLIENT_SENT 16 /* Notify the peer that data has been written */
+#define SCIF_CLIENT_RCVD 17 /* Notify the peer that data has been read */
+#define SCIF_GET_NODE_INFO 18 /* Get current node mask from the mgmt node*/
+#define SCIF_REGISTER 19 /* Tell peer about a new registered window */
+#define SCIF_REGISTER_ACK 20 /* Notify peer about unregistration success */
+#define SCIF_REGISTER_NACK 21 /* Notify peer about registration success */
+#define SCIF_UNREGISTER 22 /* Tell peer about unregistering a window */
+#define SCIF_UNREGISTER_ACK 23 /* Notify peer about registration failure */
+#define SCIF_UNREGISTER_NACK 24 /* Notify peer about unregistration failure */
+#define SCIF_ALLOC_REQ 25 /* Request a mapped buffer */
+#define SCIF_ALLOC_GNT 26 /* Notify peer about allocation success */
+#define SCIF_ALLOC_REJ 27 /* Notify peer about allocation failure */
+#define SCIF_FREE_VIRT 28 /* Free previously allocated virtual memory */
+#define SCIF_MUNMAP 29 /* Acknowledgment for a SCIF_MMAP request */
+#define SCIF_MARK 30 /* SCIF Remote Fence Mark Request */
+#define SCIF_MARK_ACK 31 /* SCIF Remote Fence Mark Success */
+#define SCIF_MARK_NACK 32 /* SCIF Remote Fence Mark Failure */
+#define SCIF_WAIT 33 /* SCIF Remote Fence Wait Request */
+#define SCIF_WAIT_ACK 34 /* SCIF Remote Fence Wait Success */
+#define SCIF_WAIT_NACK 35 /* SCIF Remote Fence Wait Failure */
+#define SCIF_SIG_LOCAL 36 /* SCIF Remote Fence Local Signal Request */
+#define SCIF_SIG_REMOTE 37 /* SCIF Remote Fence Remote Signal Request */
+#define SCIF_SIG_ACK 38 /* SCIF Remote Fence Remote Signal Success */
+#define SCIF_SIG_NACK 39 /* SCIF Remote Fence Remote Signal Failure */
+#define SCIF_MAX_MSG SCIF_SIG_NACK
+
+/*
+ * struct scifmsg - Node QP message format
+ *
+ * @src: Source information
+ * @dst: Destination information
+ * @uop: The message opcode
+ * @payload: Unique payload format for each message
+ */
+struct scifmsg {
+	struct scif_port_id src;
+	struct scif_port_id dst;
+	u32 uop;
+	u64 payload[4];
+} __packed;
+
+/*
+ * struct scif_allocmsg - Used with SCIF_ALLOC_REQ to request
+ * the remote note to allocate memory
+ *
+ * phys_addr: Physical address of the buffer
+ * vaddr: Virtual address of the buffer
+ * size: Size of the buffer
+ * state: Current state
+ * allocwq: wait queue for status
+ */
+struct scif_allocmsg {
+	dma_addr_t phys_addr;
+	unsigned long vaddr;
+	size_t size;
+	enum scif_msg_state state;
+	wait_queue_head_t allocwq;
+};
+
+/*
+ * struct scif_qp - Node Queue Pair
+ *
+ * Interesting structure -- a little difficult because we can only
+ * write across the PCIe, so any r/w pointer we need to read is
+ * local. We only need to read the read pointer on the inbound_q
+ * and read the write pointer in the outbound_q
+ *
+ * @magic: Magic value to ensure the peer sees the QP correctly
+ * @outbound_q: The outbound ring buffer for sending messages
+ * @inbound_q: The inbound ring buffer for receiving messages
+ * @local_write: Local write index
+ * @local_read: Local read index
+ * @remote_qp: The remote queue pair
+ * @local_buf: DMA address of local ring buffer
+ * @local_qp: DMA address of the local queue pair data structure
+ * @remote_buf: DMA address of remote ring buffer
+ * @qp_state: QP state i.e. online or offline used for P2P
+ * @send_lock: synchronize access to outbound queue
+ * @recv_lock: Synchronize access to inbound queue
+ */
+struct scif_qp {
+	u64 magic;
+#define SCIFEP_MAGIC 0x5c1f000000005c1fULL
+	struct scif_rb outbound_q;
+	struct scif_rb inbound_q;
+
+	u32 local_write __aligned(64);
+	u32 local_read __aligned(64);
+	struct scif_qp *remote_qp;
+	dma_addr_t local_buf;
+	dma_addr_t local_qp;
+	dma_addr_t remote_buf;
+	u32 qp_state;
+#define SCIF_QP_OFFLINE 0xdead
+#define SCIF_QP_ONLINE 0xc0de
+	spinlock_t send_lock;
+	spinlock_t recv_lock;
+};
+
+/*
+ * struct scif_loopb_msg - An element in the loopback Node QP message list.
+ *
+ * @msg - The SCIF node QP message
+ * @list - link in the list of messages
+ */
+struct scif_loopb_msg {
+	struct scifmsg msg;
+	struct list_head list;
+};
+
+int scif_nodeqp_send(struct scif_dev *scifdev, struct scifmsg *msg);
+int _scif_nodeqp_send(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_nodeqp_intrhandler(struct scif_dev *scifdev, struct scif_qp *qp);
+int scif_loopb_msg_handler(struct scif_dev *scifdev, struct scif_qp *qp);
+int scif_setup_qp(struct scif_dev *scifdev);
+int scif_qp_response(phys_addr_t phys, struct scif_dev *dev);
+int scif_setup_qp_connect(struct scif_qp *qp, dma_addr_t *qp_offset,
+			  int local_size, struct scif_dev *scifdev);
+int scif_setup_qp_accept(struct scif_qp *qp, dma_addr_t *qp_offset,
+			 dma_addr_t phys, int local_size,
+			 struct scif_dev *scifdev);
+int scif_setup_qp_connect_response(struct scif_dev *scifdev,
+				   struct scif_qp *qp, u64 payload);
+int scif_setup_loopback_qp(struct scif_dev *scifdev);
+int scif_destroy_loopback_qp(struct scif_dev *scifdev);
+void scif_poll_qp_state(struct work_struct *work);
+void scif_destroy_p2p(struct scif_dev *scifdev);
+void scif_send_exit(struct scif_dev *scifdev);
+static inline struct device *scif_get_peer_dev(struct scif_dev *scifdev)
+{
+	struct scif_peer_dev *spdev;
+	struct device *spdev_ret;
+
+	rcu_read_lock();
+	spdev = rcu_dereference(scifdev->spdev);
+	if (spdev)
+		spdev_ret = get_device(&spdev->dev);
+	else
+		spdev_ret = ERR_PTR(-ENODEV);
+	rcu_read_unlock();
+	return spdev_ret;
+}
+
+static inline void scif_put_peer_dev(struct device *dev)
+{
+	put_device(dev);
+}
+#endif  /* SCIF_NODEQP */
diff --git a/drivers/misc/mic/scif/scif_peer_bus.c b/drivers/misc/mic/scif/scif_peer_bus.c
new file mode 100644
index 000000000..6ffa3bdbd
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_peer_bus.c
@@ -0,0 +1,183 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ */
+#include "scif_main.h"
+#include "../bus/scif_bus.h"
+#include "scif_peer_bus.h"
+
+static inline struct scif_peer_dev *
+dev_to_scif_peer(struct device *dev)
+{
+	return container_of(dev, struct scif_peer_dev, dev);
+}
+
+struct bus_type scif_peer_bus = {
+	.name  = "scif_peer_bus",
+};
+
+static void scif_peer_release_dev(struct device *d)
+{
+	struct scif_peer_dev *sdev = dev_to_scif_peer(d);
+	struct scif_dev *scifdev = &scif_dev[sdev->dnode];
+
+	scif_cleanup_scifdev(scifdev);
+	kfree(sdev);
+}
+
+static int scif_peer_initialize_device(struct scif_dev *scifdev)
+{
+	struct scif_peer_dev *spdev;
+	int ret;
+
+	spdev = kzalloc(sizeof(*spdev), GFP_KERNEL);
+	if (!spdev) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	spdev->dev.parent = scifdev->sdev->dev.parent;
+	spdev->dev.release = scif_peer_release_dev;
+	spdev->dnode = scifdev->node;
+	spdev->dev.bus = &scif_peer_bus;
+	dev_set_name(&spdev->dev, "scif_peer-dev%u", spdev->dnode);
+
+	device_initialize(&spdev->dev);
+	get_device(&spdev->dev);
+	rcu_assign_pointer(scifdev->spdev, spdev);
+
+	mutex_lock(&scif_info.conflock);
+	scif_info.total++;
+	scif_info.maxid = max_t(u32, spdev->dnode, scif_info.maxid);
+	mutex_unlock(&scif_info.conflock);
+	return 0;
+err:
+	dev_err(&scifdev->sdev->dev,
+		"dnode %d: initialize_device rc %d\n", scifdev->node, ret);
+	return ret;
+}
+
+static int scif_peer_add_device(struct scif_dev *scifdev)
+{
+	struct scif_peer_dev *spdev = rcu_dereference(scifdev->spdev);
+	char pool_name[16];
+	int ret;
+
+	ret = device_add(&spdev->dev);
+	put_device(&spdev->dev);
+	if (ret) {
+		dev_err(&scifdev->sdev->dev,
+			"dnode %d: peer device_add failed\n", scifdev->node);
+		goto put_spdev;
+	}
+
+	scnprintf(pool_name, sizeof(pool_name), "scif-%d", spdev->dnode);
+	scifdev->signal_pool = dmam_pool_create(pool_name, &scifdev->sdev->dev,
+						sizeof(struct scif_status), 1,
+						0);
+	if (!scifdev->signal_pool) {
+		dev_err(&scifdev->sdev->dev,
+			"dnode %d: dmam_pool_create failed\n", scifdev->node);
+		ret = -ENOMEM;
+		goto del_spdev;
+	}
+	dev_dbg(&spdev->dev, "Added peer dnode %d\n", spdev->dnode);
+	return 0;
+del_spdev:
+	device_del(&spdev->dev);
+put_spdev:
+	RCU_INIT_POINTER(scifdev->spdev, NULL);
+	synchronize_rcu();
+	put_device(&spdev->dev);
+
+	mutex_lock(&scif_info.conflock);
+	scif_info.total--;
+	mutex_unlock(&scif_info.conflock);
+	return ret;
+}
+
+void scif_add_peer_device(struct work_struct *work)
+{
+	struct scif_dev *scifdev = container_of(work, struct scif_dev,
+						peer_add_work);
+
+	scif_peer_add_device(scifdev);
+}
+
+/*
+ * Peer device registration is split into a device_initialize and a device_add.
+ * The reason for doing this is as follows: First, peer device registration
+ * itself cannot be done in the message processing thread and must be delegated
+ * to another workqueue, otherwise if SCIF client probe, called during peer
+ * device registration, calls scif_connect(..), it will block the message
+ * processing thread causing a deadlock. Next, device_initialize is done in the
+ * "top-half" message processing thread and device_add in the "bottom-half"
+ * workqueue. If this is not done, SCIF_CNCT_REQ message processing executing
+ * concurrently with SCIF_INIT message processing is unable to get a reference
+ * on the peer device, thereby failing the connect request.
+ */
+void scif_peer_register_device(struct scif_dev *scifdev)
+{
+	int ret;
+
+	mutex_lock(&scifdev->lock);
+	ret = scif_peer_initialize_device(scifdev);
+	if (ret)
+		goto exit;
+	schedule_work(&scifdev->peer_add_work);
+exit:
+	mutex_unlock(&scifdev->lock);
+}
+
+int scif_peer_unregister_device(struct scif_dev *scifdev)
+{
+	struct scif_peer_dev *spdev;
+
+	mutex_lock(&scifdev->lock);
+	/* Flush work to ensure device register is complete */
+	flush_work(&scifdev->peer_add_work);
+
+	/*
+	 * Continue holding scifdev->lock since theoretically unregister_device
+	 * can be called simultaneously from multiple threads
+	 */
+	spdev = rcu_dereference(scifdev->spdev);
+	if (!spdev) {
+		mutex_unlock(&scifdev->lock);
+		return -ENODEV;
+	}
+
+	RCU_INIT_POINTER(scifdev->spdev, NULL);
+	synchronize_rcu();
+	mutex_unlock(&scifdev->lock);
+
+	dev_dbg(&spdev->dev, "Removing peer dnode %d\n", spdev->dnode);
+	device_unregister(&spdev->dev);
+
+	mutex_lock(&scif_info.conflock);
+	scif_info.total--;
+	mutex_unlock(&scif_info.conflock);
+	return 0;
+}
+
+int scif_peer_bus_init(void)
+{
+	return bus_register(&scif_peer_bus);
+}
+
+void scif_peer_bus_exit(void)
+{
+	bus_unregister(&scif_peer_bus);
+}
diff --git a/drivers/misc/mic/scif/scif_peer_bus.h b/drivers/misc/mic/scif/scif_peer_bus.h
new file mode 100644
index 000000000..a3b8dd2ed
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_peer_bus.h
@@ -0,0 +1,31 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ */
+#ifndef _SCIF_PEER_BUS_H_
+#define _SCIF_PEER_BUS_H_
+
+#include <linux/device.h>
+#include <linux/mic_common.h>
+#include <linux/scif.h>
+
+struct scif_dev;
+
+void scif_add_peer_device(struct work_struct *work);
+void scif_peer_register_device(struct scif_dev *sdev);
+int scif_peer_unregister_device(struct scif_dev *scifdev);
+int scif_peer_bus_init(void);
+void scif_peer_bus_exit(void);
+#endif /* _SCIF_PEER_BUS_H */
diff --git a/drivers/misc/mic/scif/scif_ports.c b/drivers/misc/mic/scif/scif_ports.c
new file mode 100644
index 000000000..594e18d27
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_ports.c
@@ -0,0 +1,124 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include <linux/idr.h>
+
+#include "scif_main.h"
+
+#define SCIF_PORT_COUNT	0x10000	/* Ports available */
+
+struct idr scif_ports;
+
+/*
+ * struct scif_port - SCIF port information
+ *
+ * @ref_cnt - Reference count since there can be multiple endpoints
+ *		created via scif_accept(..) simultaneously using a port.
+ */
+struct scif_port {
+	int ref_cnt;
+};
+
+/**
+ * __scif_get_port - Reserve a specified port # for SCIF and add it
+ * to the global list.
+ * @port : port # to be reserved.
+ *
+ * @return : Allocated SCIF port #, or -ENOSPC if port unavailable.
+ *		On memory allocation failure, returns -ENOMEM.
+ */
+static int __scif_get_port(int start, int end)
+{
+	int id;
+	struct scif_port *port = kzalloc(sizeof(*port), GFP_ATOMIC);
+
+	if (!port)
+		return -ENOMEM;
+	spin_lock(&scif_info.port_lock);
+	id = idr_alloc(&scif_ports, port, start, end, GFP_ATOMIC);
+	if (id >= 0)
+		port->ref_cnt++;
+	spin_unlock(&scif_info.port_lock);
+	return id;
+}
+
+/**
+ * scif_rsrv_port - Reserve a specified port # for SCIF.
+ * @port : port # to be reserved.
+ *
+ * @return : Allocated SCIF port #, or -ENOSPC if port unavailable.
+ *		On memory allocation failure, returns -ENOMEM.
+ */
+int scif_rsrv_port(u16 port)
+{
+	return __scif_get_port(port, port + 1);
+}
+
+/**
+ * scif_get_new_port - Get and reserve any port # for SCIF in the range
+ *			SCIF_PORT_RSVD + 1 to SCIF_PORT_COUNT - 1.
+ *
+ * @return : Allocated SCIF port #, or -ENOSPC if no ports available.
+ *		On memory allocation failure, returns -ENOMEM.
+ */
+int scif_get_new_port(void)
+{
+	return __scif_get_port(SCIF_PORT_RSVD + 1, SCIF_PORT_COUNT);
+}
+
+/**
+ * scif_get_port - Increment the reference count for a SCIF port
+ * @id : SCIF port
+ *
+ * @return : None
+ */
+void scif_get_port(u16 id)
+{
+	struct scif_port *port;
+
+	if (!id)
+		return;
+	spin_lock(&scif_info.port_lock);
+	port = idr_find(&scif_ports, id);
+	if (port)
+		port->ref_cnt++;
+	spin_unlock(&scif_info.port_lock);
+}
+
+/**
+ * scif_put_port - Release a reserved SCIF port
+ * @id : SCIF port to be released.
+ *
+ * @return : None
+ */
+void scif_put_port(u16 id)
+{
+	struct scif_port *port;
+
+	if (!id)
+		return;
+	spin_lock(&scif_info.port_lock);
+	port = idr_find(&scif_ports, id);
+	if (port) {
+		port->ref_cnt--;
+		if (!port->ref_cnt) {
+			idr_remove(&scif_ports, id);
+			kfree(port);
+		}
+	}
+	spin_unlock(&scif_info.port_lock);
+}
diff --git a/drivers/misc/mic/scif/scif_rb.c b/drivers/misc/mic/scif/scif_rb.c
new file mode 100644
index 000000000..b665757ca
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_rb.c
@@ -0,0 +1,249 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include <linux/circ_buf.h>
+#include <linux/types.h>
+#include <linux/io.h>
+#include <linux/errno.h>
+
+#include "scif_rb.h"
+
+#define scif_rb_ring_cnt(head, tail, size) CIRC_CNT(head, tail, size)
+#define scif_rb_ring_space(head, tail, size) CIRC_SPACE(head, tail, size)
+
+/**
+ * scif_rb_init - Initializes the ring buffer
+ * @rb: ring buffer
+ * @read_ptr: A pointer to the read offset
+ * @write_ptr: A pointer to the write offset
+ * @rb_base: A pointer to the base of the ring buffer
+ * @size: The size of the ring buffer in powers of two
+ */
+void scif_rb_init(struct scif_rb *rb, u32 *read_ptr, u32 *write_ptr,
+		  void *rb_base, u8 size)
+{
+	rb->rb_base = rb_base;
+	rb->size = (1 << size);
+	rb->read_ptr = read_ptr;
+	rb->write_ptr = write_ptr;
+	rb->current_read_offset = *read_ptr;
+	rb->current_write_offset = *write_ptr;
+}
+
+/* Copies a message to the ring buffer -- handles the wrap around case */
+static void memcpy_torb(struct scif_rb *rb, void *header,
+			void *msg, u32 size)
+{
+	u32 size1, size2;
+
+	if (header + size >= rb->rb_base + rb->size) {
+		/* Need to call two copies if it wraps around */
+		size1 = (u32)(rb->rb_base + rb->size - header);
+		size2 = size - size1;
+		memcpy_toio((void __iomem __force *)header, msg, size1);
+		memcpy_toio((void __iomem __force *)rb->rb_base,
+			    msg + size1, size2);
+	} else {
+		memcpy_toio((void __iomem __force *)header, msg, size);
+	}
+}
+
+/* Copies a message from the ring buffer -- handles the wrap around case */
+static void memcpy_fromrb(struct scif_rb *rb, void *header,
+			  void *msg, u32 size)
+{
+	u32 size1, size2;
+
+	if (header + size >= rb->rb_base + rb->size) {
+		/* Need to call two copies if it wraps around */
+		size1 = (u32)(rb->rb_base + rb->size - header);
+		size2 = size - size1;
+		memcpy_fromio(msg, (void __iomem __force *)header, size1);
+		memcpy_fromio(msg + size1,
+			      (void __iomem __force *)rb->rb_base, size2);
+	} else {
+		memcpy_fromio(msg, (void __iomem __force *)header, size);
+	}
+}
+
+/**
+ * scif_rb_space - Query space available for writing to the RB
+ * @rb: ring buffer
+ *
+ * Return: size available for writing to RB in bytes.
+ */
+u32 scif_rb_space(struct scif_rb *rb)
+{
+	rb->current_read_offset = *rb->read_ptr;
+	/*
+	 * Update from the HW read pointer only once the peer has exposed the
+	 * new empty slot. This barrier is paired with the memory barrier
+	 * scif_rb_update_read_ptr()
+	 */
+	mb();
+	return scif_rb_ring_space(rb->current_write_offset,
+				  rb->current_read_offset, rb->size);
+}
+
+/**
+ * scif_rb_write - Write a message to the RB
+ * @rb: ring buffer
+ * @msg: buffer to send the message.  Must be at least size bytes long
+ * @size: the size (in bytes) to be copied to the RB
+ *
+ * This API does not block if there isn't enough space in the RB.
+ * Returns: 0 on success or -ENOMEM on failure
+ */
+int scif_rb_write(struct scif_rb *rb, void *msg, u32 size)
+{
+	void *header;
+
+	if (scif_rb_space(rb) < size)
+		return -ENOMEM;
+	header = rb->rb_base + rb->current_write_offset;
+	memcpy_torb(rb, header, msg, size);
+	/*
+	 * Wait until scif_rb_commit(). Update the local ring
+	 * buffer data, not the shared data until commit.
+	 */
+	rb->current_write_offset =
+		(rb->current_write_offset + size) & (rb->size - 1);
+	return 0;
+}
+
+/**
+ * scif_rb_commit - To submit the message to let the peer fetch it
+ * @rb: ring buffer
+ */
+void scif_rb_commit(struct scif_rb *rb)
+{
+	/*
+	 * We must ensure ordering between the all the data committed
+	 * previously before we expose the new message to the peer by
+	 * updating the write_ptr. This write barrier is paired with
+	 * the read barrier in scif_rb_count(..)
+	 */
+	wmb();
+	WRITE_ONCE(*rb->write_ptr, rb->current_write_offset);
+#ifdef CONFIG_INTEL_MIC_CARD
+	/*
+	 * X100 Si bug: For the case where a Core is performing an EXT_WR
+	 * followed by a Doorbell Write, the Core must perform two EXT_WR to the
+	 * same address with the same data before it does the Doorbell Write.
+	 * This way, if ordering is violated for the Interrupt Message, it will
+	 * fall just behind the first Posted associated with the first EXT_WR.
+	 */
+	WRITE_ONCE(*rb->write_ptr, rb->current_write_offset);
+#endif
+}
+
+/**
+ * scif_rb_get - To get next message from the ring buffer
+ * @rb: ring buffer
+ * @size: Number of bytes to be read
+ *
+ * Return: NULL if no bytes to be read from the ring buffer, otherwise the
+ *	pointer to the next byte
+ */
+static void *scif_rb_get(struct scif_rb *rb, u32 size)
+{
+	void *header = NULL;
+
+	if (scif_rb_count(rb, size) >= size)
+		header = rb->rb_base + rb->current_read_offset;
+	return header;
+}
+
+/*
+ * scif_rb_get_next - Read from ring buffer.
+ * @rb: ring buffer
+ * @msg: buffer to hold the message.  Must be at least size bytes long
+ * @size: Number of bytes to be read
+ *
+ * Return: number of bytes read if available bytes are >= size, otherwise
+ * returns zero.
+ */
+u32 scif_rb_get_next(struct scif_rb *rb, void *msg, u32 size)
+{
+	void *header = NULL;
+	int read_size = 0;
+
+	header = scif_rb_get(rb, size);
+	if (header) {
+		u32 next_cmd_offset =
+			(rb->current_read_offset + size) & (rb->size - 1);
+
+		read_size = size;
+		rb->current_read_offset = next_cmd_offset;
+		memcpy_fromrb(rb, header, msg, size);
+	}
+	return read_size;
+}
+
+/**
+ * scif_rb_update_read_ptr
+ * @rb: ring buffer
+ */
+void scif_rb_update_read_ptr(struct scif_rb *rb)
+{
+	u32 new_offset;
+
+	new_offset = rb->current_read_offset;
+	/*
+	 * We must ensure ordering between the all the data committed or read
+	 * previously before we expose the empty slot to the peer by updating
+	 * the read_ptr. This barrier is paired with the memory barrier in
+	 * scif_rb_space(..)
+	 */
+	mb();
+	WRITE_ONCE(*rb->read_ptr, new_offset);
+#ifdef CONFIG_INTEL_MIC_CARD
+	/*
+	 * X100 Si Bug: For the case where a Core is performing an EXT_WR
+	 * followed by a Doorbell Write, the Core must perform two EXT_WR to the
+	 * same address with the same data before it does the Doorbell Write.
+	 * This way, if ordering is violated for the Interrupt Message, it will
+	 * fall just behind the first Posted associated with the first EXT_WR.
+	 */
+	WRITE_ONCE(*rb->read_ptr, new_offset);
+#endif
+}
+
+/**
+ * scif_rb_count
+ * @rb: ring buffer
+ * @size: Number of bytes expected to be read
+ *
+ * Return: number of bytes that can be read from the RB
+ */
+u32 scif_rb_count(struct scif_rb *rb, u32 size)
+{
+	if (scif_rb_ring_cnt(rb->current_write_offset,
+			     rb->current_read_offset,
+			     rb->size) < size) {
+		rb->current_write_offset = *rb->write_ptr;
+		/*
+		 * Update from the HW write pointer if empty only once the peer
+		 * has exposed the new message. This read barrier is paired
+		 * with the write barrier in scif_rb_commit(..)
+		 */
+		smp_rmb();
+	}
+	return scif_rb_ring_cnt(rb->current_write_offset,
+				rb->current_read_offset,
+				rb->size);
+}
diff --git a/drivers/misc/mic/scif/scif_rb.h b/drivers/misc/mic/scif/scif_rb.h
new file mode 100644
index 000000000..166dffe30
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_rb.h
@@ -0,0 +1,100 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in
+ *   the documentation and/or other materials provided with the
+ *   distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ *   contributors may be used to endorse or promote products derived
+ *   from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Intel SCIF driver.
+ */
+#ifndef SCIF_RB_H
+#define SCIF_RB_H
+/*
+ * This file describes a general purpose, byte based ring buffer. Writers to the
+ * ring buffer need to synchronize using a lock. The same is true for readers,
+ * although in practice, the ring buffer has a single reader. It is lockless
+ * between producer and consumer so it can handle being used across the PCIe
+ * bus. The ring buffer ensures that there are no reads across the PCIe bus for
+ * performance reasons. Two of these are used to form a single bidirectional
+ * queue-pair across PCIe.
+ */
+/*
+ * struct scif_rb - SCIF Ring Buffer
+ *
+ * @rb_base: The base of the memory used for storing RB messages
+ * @read_ptr: Pointer to the read offset
+ * @write_ptr: Pointer to the write offset
+ * @size: Size of the memory in rb_base
+ * @current_read_offset: Cached read offset for performance
+ * @current_write_offset: Cached write offset for performance
+ */
+struct scif_rb {
+	void *rb_base;
+	u32 *read_ptr;
+	u32 *write_ptr;
+	u32 size;
+	u32 current_read_offset;
+	u32 current_write_offset;
+};
+
+/* methods used by both */
+void scif_rb_init(struct scif_rb *rb, u32 *read_ptr, u32 *write_ptr,
+		  void *rb_base, u8 size);
+/* writer only methods */
+/* write a new command, then scif_rb_commit() */
+int scif_rb_write(struct scif_rb *rb, void *msg, u32 size);
+/* after write(), then scif_rb_commit() */
+void scif_rb_commit(struct scif_rb *rb);
+/* query space available for writing to a RB. */
+u32 scif_rb_space(struct scif_rb *rb);
+
+/* reader only methods */
+/* read a new message from the ring buffer of size bytes */
+u32 scif_rb_get_next(struct scif_rb *rb, void *msg, u32 size);
+/* update the read pointer so that the space can be reused */
+void scif_rb_update_read_ptr(struct scif_rb *rb);
+/* count the number of bytes that can be read */
+u32 scif_rb_count(struct scif_rb *rb, u32 size);
+#endif
diff --git a/drivers/misc/mic/scif/scif_rma.c b/drivers/misc/mic/scif/scif_rma.c
new file mode 100644
index 000000000..e1f59b177
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_rma.c
@@ -0,0 +1,1775 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include <linux/dma_remapping.h>
+#include <linux/pagemap.h>
+#include <linux/sched/mm.h>
+#include <linux/sched/signal.h>
+
+#include "scif_main.h"
+#include "scif_map.h"
+
+/* Used to skip ulimit checks for registrations with SCIF_MAP_KERNEL flag */
+#define SCIF_MAP_ULIMIT 0x40
+
+bool scif_ulimit_check = 1;
+
+/**
+ * scif_rma_ep_init:
+ * @ep: end point
+ *
+ * Initialize RMA per EP data structures.
+ */
+void scif_rma_ep_init(struct scif_endpt *ep)
+{
+	struct scif_endpt_rma_info *rma = &ep->rma_info;
+
+	mutex_init(&rma->rma_lock);
+	init_iova_domain(&rma->iovad, PAGE_SIZE, SCIF_IOVA_START_PFN);
+	spin_lock_init(&rma->tc_lock);
+	mutex_init(&rma->mmn_lock);
+	INIT_LIST_HEAD(&rma->reg_list);
+	INIT_LIST_HEAD(&rma->remote_reg_list);
+	atomic_set(&rma->tw_refcount, 0);
+	atomic_set(&rma->tcw_refcount, 0);
+	atomic_set(&rma->tcw_total_pages, 0);
+	atomic_set(&rma->fence_refcount, 0);
+
+	rma->async_list_del = 0;
+	rma->dma_chan = NULL;
+	INIT_LIST_HEAD(&rma->mmn_list);
+	INIT_LIST_HEAD(&rma->vma_list);
+	init_waitqueue_head(&rma->markwq);
+}
+
+/**
+ * scif_rma_ep_can_uninit:
+ * @ep: end point
+ *
+ * Returns 1 if an endpoint can be uninitialized and 0 otherwise.
+ */
+int scif_rma_ep_can_uninit(struct scif_endpt *ep)
+{
+	int ret = 0;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	/* Destroy RMA Info only if both lists are empty */
+	if (list_empty(&ep->rma_info.reg_list) &&
+	    list_empty(&ep->rma_info.remote_reg_list) &&
+	    list_empty(&ep->rma_info.mmn_list) &&
+	    !atomic_read(&ep->rma_info.tw_refcount) &&
+	    !atomic_read(&ep->rma_info.tcw_refcount) &&
+	    !atomic_read(&ep->rma_info.fence_refcount))
+		ret = 1;
+	mutex_unlock(&ep->rma_info.rma_lock);
+	return ret;
+}
+
+/**
+ * scif_create_pinned_pages:
+ * @nr_pages: number of pages in window
+ * @prot: read/write protection
+ *
+ * Allocate and prepare a set of pinned pages.
+ */
+static struct scif_pinned_pages *
+scif_create_pinned_pages(int nr_pages, int prot)
+{
+	struct scif_pinned_pages *pin;
+
+	might_sleep();
+	pin = scif_zalloc(sizeof(*pin));
+	if (!pin)
+		goto error;
+
+	pin->pages = scif_zalloc(nr_pages * sizeof(*pin->pages));
+	if (!pin->pages)
+		goto error_free_pinned_pages;
+
+	pin->prot = prot;
+	pin->magic = SCIFEP_MAGIC;
+	return pin;
+
+error_free_pinned_pages:
+	scif_free(pin, sizeof(*pin));
+error:
+	return NULL;
+}
+
+/**
+ * scif_destroy_pinned_pages:
+ * @pin: A set of pinned pages.
+ *
+ * Deallocate resources for pinned pages.
+ */
+static int scif_destroy_pinned_pages(struct scif_pinned_pages *pin)
+{
+	int j;
+	int writeable = pin->prot & SCIF_PROT_WRITE;
+	int kernel = SCIF_MAP_KERNEL & pin->map_flags;
+
+	for (j = 0; j < pin->nr_pages; j++) {
+		if (pin->pages[j] && !kernel) {
+			if (writeable)
+				SetPageDirty(pin->pages[j]);
+			put_page(pin->pages[j]);
+		}
+	}
+
+	scif_free(pin->pages,
+		  pin->nr_pages * sizeof(*pin->pages));
+	scif_free(pin, sizeof(*pin));
+	return 0;
+}
+
+/*
+ * scif_create_window:
+ * @ep: end point
+ * @nr_pages: number of pages
+ * @offset: registration offset
+ * @temp: true if a temporary window is being created
+ *
+ * Allocate and prepare a self registration window.
+ */
+struct scif_window *scif_create_window(struct scif_endpt *ep, int nr_pages,
+				       s64 offset, bool temp)
+{
+	struct scif_window *window;
+
+	might_sleep();
+	window = scif_zalloc(sizeof(*window));
+	if (!window)
+		goto error;
+
+	window->dma_addr = scif_zalloc(nr_pages * sizeof(*window->dma_addr));
+	if (!window->dma_addr)
+		goto error_free_window;
+
+	window->num_pages = scif_zalloc(nr_pages * sizeof(*window->num_pages));
+	if (!window->num_pages)
+		goto error_free_window;
+
+	window->offset = offset;
+	window->ep = (u64)ep;
+	window->magic = SCIFEP_MAGIC;
+	window->reg_state = OP_IDLE;
+	init_waitqueue_head(&window->regwq);
+	window->unreg_state = OP_IDLE;
+	init_waitqueue_head(&window->unregwq);
+	INIT_LIST_HEAD(&window->list);
+	window->type = SCIF_WINDOW_SELF;
+	window->temp = temp;
+	return window;
+
+error_free_window:
+	scif_free(window->dma_addr,
+		  nr_pages * sizeof(*window->dma_addr));
+	scif_free(window, sizeof(*window));
+error:
+	return NULL;
+}
+
+/**
+ * scif_destroy_incomplete_window:
+ * @ep: end point
+ * @window: registration window
+ *
+ * Deallocate resources for self window.
+ */
+static void scif_destroy_incomplete_window(struct scif_endpt *ep,
+					   struct scif_window *window)
+{
+	int err;
+	int nr_pages = window->nr_pages;
+	struct scif_allocmsg *alloc = &window->alloc_handle;
+	struct scifmsg msg;
+
+retry:
+	/* Wait for a SCIF_ALLOC_GNT/REJ message */
+	err = wait_event_timeout(alloc->allocwq,
+				 alloc->state != OP_IN_PROGRESS,
+				 SCIF_NODE_ALIVE_TIMEOUT);
+	if (!err && scifdev_alive(ep))
+		goto retry;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	if (alloc->state == OP_COMPLETED) {
+		msg.uop = SCIF_FREE_VIRT;
+		msg.src = ep->port;
+		msg.payload[0] = ep->remote_ep;
+		msg.payload[1] = window->alloc_handle.vaddr;
+		msg.payload[2] = (u64)window;
+		msg.payload[3] = SCIF_REGISTER;
+		_scif_nodeqp_send(ep->remote_dev, &msg);
+	}
+	mutex_unlock(&ep->rma_info.rma_lock);
+
+	scif_free_window_offset(ep, window, window->offset);
+	scif_free(window->dma_addr, nr_pages * sizeof(*window->dma_addr));
+	scif_free(window->num_pages, nr_pages * sizeof(*window->num_pages));
+	scif_free(window, sizeof(*window));
+}
+
+/**
+ * scif_unmap_window:
+ * @remote_dev: SCIF remote device
+ * @window: registration window
+ *
+ * Delete any DMA mappings created for a registered self window
+ */
+void scif_unmap_window(struct scif_dev *remote_dev, struct scif_window *window)
+{
+	int j;
+
+	if (scif_is_iommu_enabled() && !scifdev_self(remote_dev)) {
+		if (window->st) {
+			dma_unmap_sg(&remote_dev->sdev->dev,
+				     window->st->sgl, window->st->nents,
+				     DMA_BIDIRECTIONAL);
+			sg_free_table(window->st);
+			kfree(window->st);
+			window->st = NULL;
+		}
+	} else {
+		for (j = 0; j < window->nr_contig_chunks; j++) {
+			if (window->dma_addr[j]) {
+				scif_unmap_single(window->dma_addr[j],
+						  remote_dev,
+						  window->num_pages[j] <<
+						  PAGE_SHIFT);
+				window->dma_addr[j] = 0x0;
+			}
+		}
+	}
+}
+
+static inline struct mm_struct *__scif_acquire_mm(void)
+{
+	if (scif_ulimit_check)
+		return get_task_mm(current);
+	return NULL;
+}
+
+static inline void __scif_release_mm(struct mm_struct *mm)
+{
+	if (mm)
+		mmput(mm);
+}
+
+static inline int
+__scif_dec_pinned_vm_lock(struct mm_struct *mm,
+			  int nr_pages, bool try_lock)
+{
+	if (!mm || !nr_pages || !scif_ulimit_check)
+		return 0;
+	if (try_lock) {
+		if (!down_write_trylock(&mm->mmap_sem)) {
+			dev_err(scif_info.mdev.this_device,
+				"%s %d err\n", __func__, __LINE__);
+			return -1;
+		}
+	} else {
+		down_write(&mm->mmap_sem);
+	}
+	mm->pinned_vm -= nr_pages;
+	up_write(&mm->mmap_sem);
+	return 0;
+}
+
+static inline int __scif_check_inc_pinned_vm(struct mm_struct *mm,
+					     int nr_pages)
+{
+	unsigned long locked, lock_limit;
+
+	if (!mm || !nr_pages || !scif_ulimit_check)
+		return 0;
+
+	locked = nr_pages;
+	locked += mm->pinned_vm;
+	lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+	if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {
+		dev_err(scif_info.mdev.this_device,
+			"locked(%lu) > lock_limit(%lu)\n",
+			locked, lock_limit);
+		return -ENOMEM;
+	}
+	mm->pinned_vm = locked;
+	return 0;
+}
+
+/**
+ * scif_destroy_window:
+ * @ep: end point
+ * @window: registration window
+ *
+ * Deallocate resources for self window.
+ */
+int scif_destroy_window(struct scif_endpt *ep, struct scif_window *window)
+{
+	int j;
+	struct scif_pinned_pages *pinned_pages = window->pinned_pages;
+	int nr_pages = window->nr_pages;
+
+	might_sleep();
+	if (!window->temp && window->mm) {
+		__scif_dec_pinned_vm_lock(window->mm, window->nr_pages, 0);
+		__scif_release_mm(window->mm);
+		window->mm = NULL;
+	}
+
+	scif_free_window_offset(ep, window, window->offset);
+	scif_unmap_window(ep->remote_dev, window);
+	/*
+	 * Decrement references for this set of pinned pages from
+	 * this window.
+	 */
+	j = atomic_sub_return(1, &pinned_pages->ref_count);
+	if (j < 0)
+		dev_err(scif_info.mdev.this_device,
+			"%s %d incorrect ref count %d\n",
+			__func__, __LINE__, j);
+	/*
+	 * If the ref count for pinned_pages is zero then someone
+	 * has already called scif_unpin_pages() for it and we should
+	 * destroy the page cache.
+	 */
+	if (!j)
+		scif_destroy_pinned_pages(window->pinned_pages);
+	scif_free(window->dma_addr, nr_pages * sizeof(*window->dma_addr));
+	scif_free(window->num_pages, nr_pages * sizeof(*window->num_pages));
+	window->magic = 0;
+	scif_free(window, sizeof(*window));
+	return 0;
+}
+
+/**
+ * scif_create_remote_lookup:
+ * @remote_dev: SCIF remote device
+ * @window: remote window
+ *
+ * Allocate and prepare lookup entries for the remote
+ * end to copy over the physical addresses.
+ * Returns 0 on success and appropriate errno on failure.
+ */
+static int scif_create_remote_lookup(struct scif_dev *remote_dev,
+				     struct scif_window *window)
+{
+	int i, j, err = 0;
+	int nr_pages = window->nr_pages;
+	bool vmalloc_dma_phys, vmalloc_num_pages;
+
+	might_sleep();
+	/* Map window */
+	err = scif_map_single(&window->mapped_offset,
+			      window, remote_dev, sizeof(*window));
+	if (err)
+		goto error_window;
+
+	/* Compute the number of lookup entries. 21 == 2MB Shift */
+	window->nr_lookup = ALIGN(nr_pages * PAGE_SIZE,
+					((2) * 1024 * 1024)) >> 21;
+
+	window->dma_addr_lookup.lookup =
+		scif_alloc_coherent(&window->dma_addr_lookup.offset,
+				    remote_dev, window->nr_lookup *
+				    sizeof(*window->dma_addr_lookup.lookup),
+				    GFP_KERNEL | __GFP_ZERO);
+	if (!window->dma_addr_lookup.lookup) {
+		err = -ENOMEM;
+		goto error_window;
+	}
+
+	window->num_pages_lookup.lookup =
+		scif_alloc_coherent(&window->num_pages_lookup.offset,
+				    remote_dev, window->nr_lookup *
+				    sizeof(*window->num_pages_lookup.lookup),
+				    GFP_KERNEL | __GFP_ZERO);
+	if (!window->num_pages_lookup.lookup) {
+		err = -ENOMEM;
+		goto error_window;
+	}
+
+	vmalloc_dma_phys = is_vmalloc_addr(&window->dma_addr[0]);
+	vmalloc_num_pages = is_vmalloc_addr(&window->num_pages[0]);
+
+	/* Now map each of the pages containing physical addresses */
+	for (i = 0, j = 0; i < nr_pages; i += SCIF_NR_ADDR_IN_PAGE, j++) {
+		err = scif_map_page(&window->dma_addr_lookup.lookup[j],
+				    vmalloc_dma_phys ?
+				    vmalloc_to_page(&window->dma_addr[i]) :
+				    virt_to_page(&window->dma_addr[i]),
+				    remote_dev);
+		if (err)
+			goto error_window;
+		err = scif_map_page(&window->num_pages_lookup.lookup[j],
+				    vmalloc_num_pages ?
+				    vmalloc_to_page(&window->num_pages[i]) :
+				    virt_to_page(&window->num_pages[i]),
+				    remote_dev);
+		if (err)
+			goto error_window;
+	}
+	return 0;
+error_window:
+	return err;
+}
+
+/**
+ * scif_destroy_remote_lookup:
+ * @remote_dev: SCIF remote device
+ * @window: remote window
+ *
+ * Destroy lookup entries used for the remote
+ * end to copy over the physical addresses.
+ */
+static void scif_destroy_remote_lookup(struct scif_dev *remote_dev,
+				       struct scif_window *window)
+{
+	int i, j;
+
+	if (window->nr_lookup) {
+		struct scif_rma_lookup *lup = &window->dma_addr_lookup;
+		struct scif_rma_lookup *npup = &window->num_pages_lookup;
+
+		for (i = 0, j = 0; i < window->nr_pages;
+			i += SCIF_NR_ADDR_IN_PAGE, j++) {
+			if (lup->lookup && lup->lookup[j])
+				scif_unmap_single(lup->lookup[j],
+						  remote_dev,
+						  PAGE_SIZE);
+			if (npup->lookup && npup->lookup[j])
+				scif_unmap_single(npup->lookup[j],
+						  remote_dev,
+						  PAGE_SIZE);
+		}
+		if (lup->lookup)
+			scif_free_coherent(lup->lookup, lup->offset,
+					   remote_dev, window->nr_lookup *
+					   sizeof(*lup->lookup));
+		if (npup->lookup)
+			scif_free_coherent(npup->lookup, npup->offset,
+					   remote_dev, window->nr_lookup *
+					   sizeof(*npup->lookup));
+		if (window->mapped_offset)
+			scif_unmap_single(window->mapped_offset,
+					  remote_dev, sizeof(*window));
+		window->nr_lookup = 0;
+	}
+}
+
+/**
+ * scif_create_remote_window:
+ * @ep: end point
+ * @nr_pages: number of pages in window
+ *
+ * Allocate and prepare a remote registration window.
+ */
+static struct scif_window *
+scif_create_remote_window(struct scif_dev *scifdev, int nr_pages)
+{
+	struct scif_window *window;
+
+	might_sleep();
+	window = scif_zalloc(sizeof(*window));
+	if (!window)
+		goto error_ret;
+
+	window->magic = SCIFEP_MAGIC;
+	window->nr_pages = nr_pages;
+
+	window->dma_addr = scif_zalloc(nr_pages * sizeof(*window->dma_addr));
+	if (!window->dma_addr)
+		goto error_window;
+
+	window->num_pages = scif_zalloc(nr_pages *
+					sizeof(*window->num_pages));
+	if (!window->num_pages)
+		goto error_window;
+
+	if (scif_create_remote_lookup(scifdev, window))
+		goto error_window;
+
+	window->type = SCIF_WINDOW_PEER;
+	window->unreg_state = OP_IDLE;
+	INIT_LIST_HEAD(&window->list);
+	return window;
+error_window:
+	scif_destroy_remote_window(window);
+error_ret:
+	return NULL;
+}
+
+/**
+ * scif_destroy_remote_window:
+ * @ep: end point
+ * @window: remote registration window
+ *
+ * Deallocate resources for remote window.
+ */
+void
+scif_destroy_remote_window(struct scif_window *window)
+{
+	scif_free(window->dma_addr, window->nr_pages *
+		  sizeof(*window->dma_addr));
+	scif_free(window->num_pages, window->nr_pages *
+		  sizeof(*window->num_pages));
+	window->magic = 0;
+	scif_free(window, sizeof(*window));
+}
+
+/**
+ * scif_iommu_map: create DMA mappings if the IOMMU is enabled
+ * @remote_dev: SCIF remote device
+ * @window: remote registration window
+ *
+ * Map the physical pages using dma_map_sg(..) and then detect the number
+ * of contiguous DMA mappings allocated
+ */
+static int scif_iommu_map(struct scif_dev *remote_dev,
+			  struct scif_window *window)
+{
+	struct scatterlist *sg;
+	int i, err;
+	scif_pinned_pages_t pin = window->pinned_pages;
+
+	window->st = kzalloc(sizeof(*window->st), GFP_KERNEL);
+	if (!window->st)
+		return -ENOMEM;
+
+	err = sg_alloc_table(window->st, window->nr_pages, GFP_KERNEL);
+	if (err)
+		return err;
+
+	for_each_sg(window->st->sgl, sg, window->st->nents, i)
+		sg_set_page(sg, pin->pages[i], PAGE_SIZE, 0x0);
+
+	err = dma_map_sg(&remote_dev->sdev->dev, window->st->sgl,
+			 window->st->nents, DMA_BIDIRECTIONAL);
+	if (!err)
+		return -ENOMEM;
+	/* Detect contiguous ranges of DMA mappings */
+	sg = window->st->sgl;
+	for (i = 0; sg; i++) {
+		dma_addr_t last_da;
+
+		window->dma_addr[i] = sg_dma_address(sg);
+		window->num_pages[i] = sg_dma_len(sg) >> PAGE_SHIFT;
+		last_da = sg_dma_address(sg) + sg_dma_len(sg);
+		while ((sg = sg_next(sg)) && sg_dma_address(sg) == last_da) {
+			window->num_pages[i] +=
+				(sg_dma_len(sg) >> PAGE_SHIFT);
+			last_da = window->dma_addr[i] +
+				sg_dma_len(sg);
+		}
+		window->nr_contig_chunks++;
+	}
+	return 0;
+}
+
+/**
+ * scif_map_window:
+ * @remote_dev: SCIF remote device
+ * @window: self registration window
+ *
+ * Map pages of a window into the aperture/PCI.
+ * Also determine addresses required for DMA.
+ */
+int
+scif_map_window(struct scif_dev *remote_dev, struct scif_window *window)
+{
+	int i, j, k, err = 0, nr_contig_pages;
+	scif_pinned_pages_t pin;
+	phys_addr_t phys_prev, phys_curr;
+
+	might_sleep();
+
+	pin = window->pinned_pages;
+
+	if (intel_iommu_enabled && !scifdev_self(remote_dev))
+		return scif_iommu_map(remote_dev, window);
+
+	for (i = 0, j = 0; i < window->nr_pages; i += nr_contig_pages, j++) {
+		phys_prev = page_to_phys(pin->pages[i]);
+		nr_contig_pages = 1;
+
+		/* Detect physically contiguous chunks */
+		for (k = i + 1; k < window->nr_pages; k++) {
+			phys_curr = page_to_phys(pin->pages[k]);
+			if (phys_curr != (phys_prev + PAGE_SIZE))
+				break;
+			phys_prev = phys_curr;
+			nr_contig_pages++;
+		}
+		window->num_pages[j] = nr_contig_pages;
+		window->nr_contig_chunks++;
+		if (scif_is_mgmt_node()) {
+			/*
+			 * Management node has to deal with SMPT on X100 and
+			 * hence the DMA mapping is required
+			 */
+			err = scif_map_single(&window->dma_addr[j],
+					      phys_to_virt(page_to_phys(
+							   pin->pages[i])),
+					      remote_dev,
+					      nr_contig_pages << PAGE_SHIFT);
+			if (err)
+				return err;
+		} else {
+			window->dma_addr[j] = page_to_phys(pin->pages[i]);
+		}
+	}
+	return err;
+}
+
+/**
+ * scif_send_scif_unregister:
+ * @ep: end point
+ * @window: self registration window
+ *
+ * Send a SCIF_UNREGISTER message.
+ */
+static int scif_send_scif_unregister(struct scif_endpt *ep,
+				     struct scif_window *window)
+{
+	struct scifmsg msg;
+
+	msg.uop = SCIF_UNREGISTER;
+	msg.src = ep->port;
+	msg.payload[0] = window->alloc_handle.vaddr;
+	msg.payload[1] = (u64)window;
+	return scif_nodeqp_send(ep->remote_dev, &msg);
+}
+
+/**
+ * scif_unregister_window:
+ * @window: self registration window
+ *
+ * Send an unregistration request and wait for a response.
+ */
+int scif_unregister_window(struct scif_window *window)
+{
+	int err = 0;
+	struct scif_endpt *ep = (struct scif_endpt *)window->ep;
+	bool send_msg = false;
+
+	might_sleep();
+	switch (window->unreg_state) {
+	case OP_IDLE:
+	{
+		window->unreg_state = OP_IN_PROGRESS;
+		send_msg = true;
+		/* fall through */
+	}
+	case OP_IN_PROGRESS:
+	{
+		scif_get_window(window, 1);
+		mutex_unlock(&ep->rma_info.rma_lock);
+		if (send_msg) {
+			err = scif_send_scif_unregister(ep, window);
+			if (err) {
+				window->unreg_state = OP_COMPLETED;
+				goto done;
+			}
+		} else {
+			/* Return ENXIO since unregistration is in progress */
+			mutex_lock(&ep->rma_info.rma_lock);
+			return -ENXIO;
+		}
+retry:
+		/* Wait for a SCIF_UNREGISTER_(N)ACK message */
+		err = wait_event_timeout(window->unregwq,
+					 window->unreg_state != OP_IN_PROGRESS,
+					 SCIF_NODE_ALIVE_TIMEOUT);
+		if (!err && scifdev_alive(ep))
+			goto retry;
+		if (!err) {
+			err = -ENODEV;
+			window->unreg_state = OP_COMPLETED;
+			dev_err(scif_info.mdev.this_device,
+				"%s %d err %d\n", __func__, __LINE__, err);
+		}
+		if (err > 0)
+			err = 0;
+done:
+		mutex_lock(&ep->rma_info.rma_lock);
+		scif_put_window(window, 1);
+		break;
+	}
+	case OP_FAILED:
+	{
+		if (!scifdev_alive(ep)) {
+			err = -ENODEV;
+			window->unreg_state = OP_COMPLETED;
+		}
+		break;
+	}
+	case OP_COMPLETED:
+		break;
+	default:
+		err = -ENODEV;
+	}
+
+	if (window->unreg_state == OP_COMPLETED && window->ref_count)
+		scif_put_window(window, window->nr_pages);
+
+	if (!window->ref_count) {
+		atomic_inc(&ep->rma_info.tw_refcount);
+		list_del_init(&window->list);
+		scif_free_window_offset(ep, window, window->offset);
+		mutex_unlock(&ep->rma_info.rma_lock);
+		if ((!!(window->pinned_pages->map_flags & SCIF_MAP_KERNEL)) &&
+		    scifdev_alive(ep)) {
+			scif_drain_dma_intr(ep->remote_dev->sdev,
+					    ep->rma_info.dma_chan);
+		} else {
+			if (!__scif_dec_pinned_vm_lock(window->mm,
+						       window->nr_pages, 1)) {
+				__scif_release_mm(window->mm);
+				window->mm = NULL;
+			}
+		}
+		scif_queue_for_cleanup(window, &scif_info.rma);
+		mutex_lock(&ep->rma_info.rma_lock);
+	}
+	return err;
+}
+
+/**
+ * scif_send_alloc_request:
+ * @ep: end point
+ * @window: self registration window
+ *
+ * Send a remote window allocation request
+ */
+static int scif_send_alloc_request(struct scif_endpt *ep,
+				   struct scif_window *window)
+{
+	struct scifmsg msg;
+	struct scif_allocmsg *alloc = &window->alloc_handle;
+
+	/* Set up the Alloc Handle */
+	alloc->state = OP_IN_PROGRESS;
+	init_waitqueue_head(&alloc->allocwq);
+
+	/* Send out an allocation request */
+	msg.uop = SCIF_ALLOC_REQ;
+	msg.payload[1] = window->nr_pages;
+	msg.payload[2] = (u64)&window->alloc_handle;
+	return _scif_nodeqp_send(ep->remote_dev, &msg);
+}
+
+/**
+ * scif_prep_remote_window:
+ * @ep: end point
+ * @window: self registration window
+ *
+ * Send a remote window allocation request, wait for an allocation response,
+ * and prepares the remote window by copying over the page lists
+ */
+static int scif_prep_remote_window(struct scif_endpt *ep,
+				   struct scif_window *window)
+{
+	struct scifmsg msg;
+	struct scif_window *remote_window;
+	struct scif_allocmsg *alloc = &window->alloc_handle;
+	dma_addr_t *dma_phys_lookup, *tmp, *num_pages_lookup, *tmp1;
+	int i = 0, j = 0;
+	int nr_contig_chunks, loop_nr_contig_chunks;
+	int remaining_nr_contig_chunks, nr_lookup;
+	int err, map_err;
+
+	map_err = scif_map_window(ep->remote_dev, window);
+	if (map_err)
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d map_err %d\n", __func__, __LINE__, map_err);
+	remaining_nr_contig_chunks = window->nr_contig_chunks;
+	nr_contig_chunks = window->nr_contig_chunks;
+retry:
+	/* Wait for a SCIF_ALLOC_GNT/REJ message */
+	err = wait_event_timeout(alloc->allocwq,
+				 alloc->state != OP_IN_PROGRESS,
+				 SCIF_NODE_ALIVE_TIMEOUT);
+	mutex_lock(&ep->rma_info.rma_lock);
+	/* Synchronize with the thread waking up allocwq */
+	mutex_unlock(&ep->rma_info.rma_lock);
+	if (!err && scifdev_alive(ep))
+		goto retry;
+
+	if (!err)
+		err = -ENODEV;
+
+	if (err > 0)
+		err = 0;
+	else
+		return err;
+
+	/* Bail out. The remote end rejected this request */
+	if (alloc->state == OP_FAILED)
+		return -ENOMEM;
+
+	if (map_err) {
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %d\n", __func__, __LINE__, map_err);
+		msg.uop = SCIF_FREE_VIRT;
+		msg.src = ep->port;
+		msg.payload[0] = ep->remote_ep;
+		msg.payload[1] = window->alloc_handle.vaddr;
+		msg.payload[2] = (u64)window;
+		msg.payload[3] = SCIF_REGISTER;
+		spin_lock(&ep->lock);
+		if (ep->state == SCIFEP_CONNECTED)
+			err = _scif_nodeqp_send(ep->remote_dev, &msg);
+		else
+			err = -ENOTCONN;
+		spin_unlock(&ep->lock);
+		return err;
+	}
+
+	remote_window = scif_ioremap(alloc->phys_addr, sizeof(*window),
+				     ep->remote_dev);
+
+	/* Compute the number of lookup entries. 21 == 2MB Shift */
+	nr_lookup = ALIGN(nr_contig_chunks, SCIF_NR_ADDR_IN_PAGE)
+			  >> ilog2(SCIF_NR_ADDR_IN_PAGE);
+
+	dma_phys_lookup =
+		scif_ioremap(remote_window->dma_addr_lookup.offset,
+			     nr_lookup *
+			     sizeof(*remote_window->dma_addr_lookup.lookup),
+			     ep->remote_dev);
+	num_pages_lookup =
+		scif_ioremap(remote_window->num_pages_lookup.offset,
+			     nr_lookup *
+			     sizeof(*remote_window->num_pages_lookup.lookup),
+			     ep->remote_dev);
+
+	while (remaining_nr_contig_chunks) {
+		loop_nr_contig_chunks = min_t(int, remaining_nr_contig_chunks,
+					      (int)SCIF_NR_ADDR_IN_PAGE);
+		/* #1/2 - Copy  physical addresses over to the remote side */
+
+		/* #2/2 - Copy DMA addresses (addresses that are fed into the
+		 * DMA engine) We transfer bus addresses which are then
+		 * converted into a MIC physical address on the remote
+		 * side if it is a MIC, if the remote node is a mgmt node we
+		 * transfer the MIC physical address
+		 */
+		tmp = scif_ioremap(dma_phys_lookup[j],
+				   loop_nr_contig_chunks *
+				   sizeof(*window->dma_addr),
+				   ep->remote_dev);
+		tmp1 = scif_ioremap(num_pages_lookup[j],
+				    loop_nr_contig_chunks *
+				    sizeof(*window->num_pages),
+				    ep->remote_dev);
+		if (scif_is_mgmt_node()) {
+			memcpy_toio((void __force __iomem *)tmp,
+				    &window->dma_addr[i], loop_nr_contig_chunks
+				    * sizeof(*window->dma_addr));
+			memcpy_toio((void __force __iomem *)tmp1,
+				    &window->num_pages[i], loop_nr_contig_chunks
+				    * sizeof(*window->num_pages));
+		} else {
+			if (scifdev_is_p2p(ep->remote_dev)) {
+				/*
+				 * add remote node's base address for this node
+				 * to convert it into a MIC address
+				 */
+				int m;
+				dma_addr_t dma_addr;
+
+				for (m = 0; m < loop_nr_contig_chunks; m++) {
+					dma_addr = window->dma_addr[i + m] +
+						ep->remote_dev->base_addr;
+					writeq(dma_addr,
+					       (void __force __iomem *)&tmp[m]);
+				}
+				memcpy_toio((void __force __iomem *)tmp1,
+					    &window->num_pages[i],
+					    loop_nr_contig_chunks
+					    * sizeof(*window->num_pages));
+			} else {
+				/* Mgmt node or loopback - transfer DMA
+				 * addresses as is, this is the same as a
+				 * MIC physical address (we use the dma_addr
+				 * and not the phys_addr array since the
+				 * phys_addr is only setup if there is a mmap()
+				 * request from the mgmt node)
+				 */
+				memcpy_toio((void __force __iomem *)tmp,
+					    &window->dma_addr[i],
+					    loop_nr_contig_chunks *
+					    sizeof(*window->dma_addr));
+				memcpy_toio((void __force __iomem *)tmp1,
+					    &window->num_pages[i],
+					    loop_nr_contig_chunks *
+					    sizeof(*window->num_pages));
+			}
+		}
+		remaining_nr_contig_chunks -= loop_nr_contig_chunks;
+		i += loop_nr_contig_chunks;
+		j++;
+		scif_iounmap(tmp, loop_nr_contig_chunks *
+			     sizeof(*window->dma_addr), ep->remote_dev);
+		scif_iounmap(tmp1, loop_nr_contig_chunks *
+			     sizeof(*window->num_pages), ep->remote_dev);
+	}
+
+	/* Prepare the remote window for the peer */
+	remote_window->peer_window = (u64)window;
+	remote_window->offset = window->offset;
+	remote_window->prot = window->prot;
+	remote_window->nr_contig_chunks = nr_contig_chunks;
+	remote_window->ep = ep->remote_ep;
+	scif_iounmap(num_pages_lookup,
+		     nr_lookup *
+		     sizeof(*remote_window->num_pages_lookup.lookup),
+		     ep->remote_dev);
+	scif_iounmap(dma_phys_lookup,
+		     nr_lookup *
+		     sizeof(*remote_window->dma_addr_lookup.lookup),
+		     ep->remote_dev);
+	scif_iounmap(remote_window, sizeof(*remote_window), ep->remote_dev);
+	window->peer_window = alloc->vaddr;
+	return err;
+}
+
+/**
+ * scif_send_scif_register:
+ * @ep: end point
+ * @window: self registration window
+ *
+ * Send a SCIF_REGISTER message if EP is connected and wait for a
+ * SCIF_REGISTER_(N)ACK message else send a SCIF_FREE_VIRT
+ * message so that the peer can free its remote window allocated earlier.
+ */
+static int scif_send_scif_register(struct scif_endpt *ep,
+				   struct scif_window *window)
+{
+	int err = 0;
+	struct scifmsg msg;
+
+	msg.src = ep->port;
+	msg.payload[0] = ep->remote_ep;
+	msg.payload[1] = window->alloc_handle.vaddr;
+	msg.payload[2] = (u64)window;
+	spin_lock(&ep->lock);
+	if (ep->state == SCIFEP_CONNECTED) {
+		msg.uop = SCIF_REGISTER;
+		window->reg_state = OP_IN_PROGRESS;
+		err = _scif_nodeqp_send(ep->remote_dev, &msg);
+		spin_unlock(&ep->lock);
+		if (!err) {
+retry:
+			/* Wait for a SCIF_REGISTER_(N)ACK message */
+			err = wait_event_timeout(window->regwq,
+						 window->reg_state !=
+						 OP_IN_PROGRESS,
+						 SCIF_NODE_ALIVE_TIMEOUT);
+			if (!err && scifdev_alive(ep))
+				goto retry;
+			err = !err ? -ENODEV : 0;
+			if (window->reg_state == OP_FAILED)
+				err = -ENOTCONN;
+		}
+	} else {
+		msg.uop = SCIF_FREE_VIRT;
+		msg.payload[3] = SCIF_REGISTER;
+		err = _scif_nodeqp_send(ep->remote_dev, &msg);
+		spin_unlock(&ep->lock);
+		if (!err)
+			err = -ENOTCONN;
+	}
+	return err;
+}
+
+/**
+ * scif_get_window_offset:
+ * @ep: end point descriptor
+ * @flags: flags
+ * @offset: offset hint
+ * @num_pages: number of pages
+ * @out_offset: computed offset returned by reference.
+ *
+ * Compute/Claim a new offset for this EP.
+ */
+int scif_get_window_offset(struct scif_endpt *ep, int flags, s64 offset,
+			   int num_pages, s64 *out_offset)
+{
+	s64 page_index;
+	struct iova *iova_ptr;
+	int err = 0;
+
+	if (flags & SCIF_MAP_FIXED) {
+		page_index = SCIF_IOVA_PFN(offset);
+		iova_ptr = reserve_iova(&ep->rma_info.iovad, page_index,
+					page_index + num_pages - 1);
+		if (!iova_ptr)
+			err = -EADDRINUSE;
+	} else {
+		iova_ptr = alloc_iova(&ep->rma_info.iovad, num_pages,
+				      SCIF_DMA_63BIT_PFN - 1, 0);
+		if (!iova_ptr)
+			err = -ENOMEM;
+	}
+	if (!err)
+		*out_offset = (iova_ptr->pfn_lo) << PAGE_SHIFT;
+	return err;
+}
+
+/**
+ * scif_free_window_offset:
+ * @ep: end point descriptor
+ * @window: registration window
+ * @offset: Offset to be freed
+ *
+ * Free offset for this EP. The callee is supposed to grab
+ * the RMA mutex before calling this API.
+ */
+void scif_free_window_offset(struct scif_endpt *ep,
+			     struct scif_window *window, s64 offset)
+{
+	if ((window && !window->offset_freed) || !window) {
+		free_iova(&ep->rma_info.iovad, offset >> PAGE_SHIFT);
+		if (window)
+			window->offset_freed = true;
+	}
+}
+
+/**
+ * scif_alloc_req: Respond to SCIF_ALLOC_REQ interrupt message
+ * @msg:        Interrupt message
+ *
+ * Remote side is requesting a memory allocation.
+ */
+void scif_alloc_req(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	int err;
+	struct scif_window *window = NULL;
+	int nr_pages = msg->payload[1];
+
+	window = scif_create_remote_window(scifdev, nr_pages);
+	if (!window) {
+		err = -ENOMEM;
+		goto error;
+	}
+
+	/* The peer's allocation request is granted */
+	msg->uop = SCIF_ALLOC_GNT;
+	msg->payload[0] = (u64)window;
+	msg->payload[1] = window->mapped_offset;
+	err = scif_nodeqp_send(scifdev, msg);
+	if (err)
+		scif_destroy_remote_window(window);
+	return;
+error:
+	/* The peer's allocation request is rejected */
+	dev_err(&scifdev->sdev->dev,
+		"%s %d error %d alloc_ptr %p nr_pages 0x%x\n",
+		__func__, __LINE__, err, window, nr_pages);
+	msg->uop = SCIF_ALLOC_REJ;
+	scif_nodeqp_send(scifdev, msg);
+}
+
+/**
+ * scif_alloc_gnt_rej: Respond to SCIF_ALLOC_GNT/REJ interrupt message
+ * @msg:        Interrupt message
+ *
+ * Remote side responded to a memory allocation.
+ */
+void scif_alloc_gnt_rej(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_allocmsg *handle = (struct scif_allocmsg *)msg->payload[2];
+	struct scif_window *window = container_of(handle, struct scif_window,
+						  alloc_handle);
+	struct scif_endpt *ep = (struct scif_endpt *)window->ep;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	handle->vaddr = msg->payload[0];
+	handle->phys_addr = msg->payload[1];
+	if (msg->uop == SCIF_ALLOC_GNT)
+		handle->state = OP_COMPLETED;
+	else
+		handle->state = OP_FAILED;
+	wake_up(&handle->allocwq);
+	mutex_unlock(&ep->rma_info.rma_lock);
+}
+
+/**
+ * scif_free_virt: Respond to SCIF_FREE_VIRT interrupt message
+ * @msg:        Interrupt message
+ *
+ * Free up memory kmalloc'd earlier.
+ */
+void scif_free_virt(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_window *window = (struct scif_window *)msg->payload[1];
+
+	scif_destroy_remote_window(window);
+}
+
+static void
+scif_fixup_aper_base(struct scif_dev *dev, struct scif_window *window)
+{
+	int j;
+	struct scif_hw_dev *sdev = dev->sdev;
+	phys_addr_t apt_base = 0;
+
+	/*
+	 * Add the aperture base if the DMA address is not card relative
+	 * since the DMA addresses need to be an offset into the bar
+	 */
+	if (!scifdev_self(dev) && window->type == SCIF_WINDOW_PEER &&
+	    sdev->aper && !sdev->card_rel_da)
+		apt_base = sdev->aper->pa;
+	else
+		return;
+
+	for (j = 0; j < window->nr_contig_chunks; j++) {
+		if (window->num_pages[j])
+			window->dma_addr[j] += apt_base;
+		else
+			break;
+	}
+}
+
+/**
+ * scif_recv_reg: Respond to SCIF_REGISTER interrupt message
+ * @msg:        Interrupt message
+ *
+ * Update remote window list with a new registered window.
+ */
+void scif_recv_reg(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
+	struct scif_window *window =
+		(struct scif_window *)msg->payload[1];
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	spin_lock(&ep->lock);
+	if (ep->state == SCIFEP_CONNECTED) {
+		msg->uop = SCIF_REGISTER_ACK;
+		scif_nodeqp_send(ep->remote_dev, msg);
+		scif_fixup_aper_base(ep->remote_dev, window);
+		/* No further failures expected. Insert new window */
+		scif_insert_window(window, &ep->rma_info.remote_reg_list);
+	} else {
+		msg->uop = SCIF_REGISTER_NACK;
+		scif_nodeqp_send(ep->remote_dev, msg);
+	}
+	spin_unlock(&ep->lock);
+	mutex_unlock(&ep->rma_info.rma_lock);
+	/* free up any lookup resources now that page lists are transferred */
+	scif_destroy_remote_lookup(ep->remote_dev, window);
+	/*
+	 * We could not insert the window but we need to
+	 * destroy the window.
+	 */
+	if (msg->uop == SCIF_REGISTER_NACK)
+		scif_destroy_remote_window(window);
+}
+
+/**
+ * scif_recv_unreg: Respond to SCIF_UNREGISTER interrupt message
+ * @msg:        Interrupt message
+ *
+ * Remove window from remote registration list;
+ */
+void scif_recv_unreg(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_rma_req req;
+	struct scif_window *window = NULL;
+	struct scif_window *recv_window =
+		(struct scif_window *)msg->payload[0];
+	struct scif_endpt *ep;
+	int del_window = 0;
+
+	ep = (struct scif_endpt *)recv_window->ep;
+	req.out_window = &window;
+	req.offset = recv_window->offset;
+	req.prot = 0;
+	req.nr_bytes = recv_window->nr_pages << PAGE_SHIFT;
+	req.type = SCIF_WINDOW_FULL;
+	req.head = &ep->rma_info.remote_reg_list;
+	msg->payload[0] = ep->remote_ep;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	/* Does a valid window exist? */
+	if (scif_query_window(&req)) {
+		dev_err(&scifdev->sdev->dev,
+			"%s %d -ENXIO\n", __func__, __LINE__);
+		msg->uop = SCIF_UNREGISTER_ACK;
+		goto error;
+	}
+	if (window) {
+		if (window->ref_count)
+			scif_put_window(window, window->nr_pages);
+		else
+			dev_err(&scifdev->sdev->dev,
+				"%s %d ref count should be +ve\n",
+				__func__, __LINE__);
+		window->unreg_state = OP_COMPLETED;
+		if (!window->ref_count) {
+			msg->uop = SCIF_UNREGISTER_ACK;
+			atomic_inc(&ep->rma_info.tw_refcount);
+			ep->rma_info.async_list_del = 1;
+			list_del_init(&window->list);
+			del_window = 1;
+		} else {
+			/* NACK! There are valid references to this window */
+			msg->uop = SCIF_UNREGISTER_NACK;
+		}
+	} else {
+		/* The window did not make its way to the list at all. ACK */
+		msg->uop = SCIF_UNREGISTER_ACK;
+		scif_destroy_remote_window(recv_window);
+	}
+error:
+	mutex_unlock(&ep->rma_info.rma_lock);
+	if (del_window)
+		scif_drain_dma_intr(ep->remote_dev->sdev,
+				    ep->rma_info.dma_chan);
+	scif_nodeqp_send(ep->remote_dev, msg);
+	if (del_window)
+		scif_queue_for_cleanup(window, &scif_info.rma);
+}
+
+/**
+ * scif_recv_reg_ack: Respond to SCIF_REGISTER_ACK interrupt message
+ * @msg:        Interrupt message
+ *
+ * Wake up the window waiting to complete registration.
+ */
+void scif_recv_reg_ack(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_window *window =
+		(struct scif_window *)msg->payload[2];
+	struct scif_endpt *ep = (struct scif_endpt *)window->ep;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	window->reg_state = OP_COMPLETED;
+	wake_up(&window->regwq);
+	mutex_unlock(&ep->rma_info.rma_lock);
+}
+
+/**
+ * scif_recv_reg_nack: Respond to SCIF_REGISTER_NACK interrupt message
+ * @msg:        Interrupt message
+ *
+ * Wake up the window waiting to inform it that registration
+ * cannot be completed.
+ */
+void scif_recv_reg_nack(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_window *window =
+		(struct scif_window *)msg->payload[2];
+	struct scif_endpt *ep = (struct scif_endpt *)window->ep;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	window->reg_state = OP_FAILED;
+	wake_up(&window->regwq);
+	mutex_unlock(&ep->rma_info.rma_lock);
+}
+
+/**
+ * scif_recv_unreg_ack: Respond to SCIF_UNREGISTER_ACK interrupt message
+ * @msg:        Interrupt message
+ *
+ * Wake up the window waiting to complete unregistration.
+ */
+void scif_recv_unreg_ack(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_window *window =
+		(struct scif_window *)msg->payload[1];
+	struct scif_endpt *ep = (struct scif_endpt *)window->ep;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	window->unreg_state = OP_COMPLETED;
+	wake_up(&window->unregwq);
+	mutex_unlock(&ep->rma_info.rma_lock);
+}
+
+/**
+ * scif_recv_unreg_nack: Respond to SCIF_UNREGISTER_NACK interrupt message
+ * @msg:        Interrupt message
+ *
+ * Wake up the window waiting to inform it that unregistration
+ * cannot be completed immediately.
+ */
+void scif_recv_unreg_nack(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+	struct scif_window *window =
+		(struct scif_window *)msg->payload[1];
+	struct scif_endpt *ep = (struct scif_endpt *)window->ep;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	window->unreg_state = OP_FAILED;
+	wake_up(&window->unregwq);
+	mutex_unlock(&ep->rma_info.rma_lock);
+}
+
+int __scif_pin_pages(void *addr, size_t len, int *out_prot,
+		     int map_flags, scif_pinned_pages_t *pages)
+{
+	struct scif_pinned_pages *pinned_pages;
+	int nr_pages, err = 0, i;
+	bool vmalloc_addr = false;
+	bool try_upgrade = false;
+	int prot = *out_prot;
+	int ulimit = 0;
+	struct mm_struct *mm = NULL;
+
+	/* Unsupported flags */
+	if (map_flags & ~(SCIF_MAP_KERNEL | SCIF_MAP_ULIMIT))
+		return -EINVAL;
+	ulimit = !!(map_flags & SCIF_MAP_ULIMIT);
+
+	/* Unsupported protection requested */
+	if (prot & ~(SCIF_PROT_READ | SCIF_PROT_WRITE))
+		return -EINVAL;
+
+	/* addr/len must be page aligned. len should be non zero */
+	if (!len ||
+	    (ALIGN((u64)addr, PAGE_SIZE) != (u64)addr) ||
+	    (ALIGN((u64)len, PAGE_SIZE) != (u64)len))
+		return -EINVAL;
+
+	might_sleep();
+
+	nr_pages = len >> PAGE_SHIFT;
+
+	/* Allocate a set of pinned pages */
+	pinned_pages = scif_create_pinned_pages(nr_pages, prot);
+	if (!pinned_pages)
+		return -ENOMEM;
+
+	if (map_flags & SCIF_MAP_KERNEL) {
+		if (is_vmalloc_addr(addr))
+			vmalloc_addr = true;
+
+		for (i = 0; i < nr_pages; i++) {
+			if (vmalloc_addr)
+				pinned_pages->pages[i] =
+					vmalloc_to_page(addr + (i * PAGE_SIZE));
+			else
+				pinned_pages->pages[i] =
+					virt_to_page(addr + (i * PAGE_SIZE));
+		}
+		pinned_pages->nr_pages = nr_pages;
+		pinned_pages->map_flags = SCIF_MAP_KERNEL;
+	} else {
+		/*
+		 * SCIF supports registration caching. If a registration has
+		 * been requested with read only permissions, then we try
+		 * to pin the pages with RW permissions so that a subsequent
+		 * transfer with RW permission can hit the cache instead of
+		 * invalidating it. If the upgrade fails with RW then we
+		 * revert back to R permission and retry
+		 */
+		if (prot == SCIF_PROT_READ)
+			try_upgrade = true;
+		prot |= SCIF_PROT_WRITE;
+retry:
+		mm = current->mm;
+		down_write(&mm->mmap_sem);
+		if (ulimit) {
+			err = __scif_check_inc_pinned_vm(mm, nr_pages);
+			if (err) {
+				up_write(&mm->mmap_sem);
+				pinned_pages->nr_pages = 0;
+				goto error_unmap;
+			}
+		}
+
+		pinned_pages->nr_pages = get_user_pages(
+				(u64)addr,
+				nr_pages,
+				(prot & SCIF_PROT_WRITE) ? FOLL_WRITE : 0,
+				pinned_pages->pages,
+				NULL);
+		up_write(&mm->mmap_sem);
+		if (nr_pages != pinned_pages->nr_pages) {
+			if (pinned_pages->nr_pages < 0)
+				pinned_pages->nr_pages = 0;
+			if (try_upgrade) {
+				if (ulimit)
+					__scif_dec_pinned_vm_lock(mm,
+								  nr_pages, 0);
+				/* Roll back any pinned pages */
+				for (i = 0; i < pinned_pages->nr_pages; i++) {
+					if (pinned_pages->pages[i])
+						put_page(
+						pinned_pages->pages[i]);
+				}
+				prot &= ~SCIF_PROT_WRITE;
+				try_upgrade = false;
+				goto retry;
+			}
+		}
+		pinned_pages->map_flags = 0;
+	}
+
+	if (pinned_pages->nr_pages < nr_pages) {
+		err = -EFAULT;
+		goto dec_pinned;
+	}
+
+	*out_prot = prot;
+	atomic_set(&pinned_pages->ref_count, 1);
+	*pages = pinned_pages;
+	return err;
+dec_pinned:
+	if (ulimit)
+		__scif_dec_pinned_vm_lock(mm, nr_pages, 0);
+	/* Something went wrong! Rollback */
+error_unmap:
+	scif_destroy_pinned_pages(pinned_pages);
+	*pages = NULL;
+	dev_dbg(scif_info.mdev.this_device,
+		"%s %d err %d len 0x%lx\n", __func__, __LINE__, err, len);
+	return err;
+}
+
+int scif_pin_pages(void *addr, size_t len, int prot,
+		   int map_flags, scif_pinned_pages_t *pages)
+{
+	return __scif_pin_pages(addr, len, &prot, map_flags, pages);
+}
+EXPORT_SYMBOL_GPL(scif_pin_pages);
+
+int scif_unpin_pages(scif_pinned_pages_t pinned_pages)
+{
+	int err = 0, ret;
+
+	if (!pinned_pages || SCIFEP_MAGIC != pinned_pages->magic)
+		return -EINVAL;
+
+	ret = atomic_sub_return(1, &pinned_pages->ref_count);
+	if (ret < 0) {
+		dev_err(scif_info.mdev.this_device,
+			"%s %d scif_unpin_pages called without pinning? rc %d\n",
+			__func__, __LINE__, ret);
+		return -EINVAL;
+	}
+	/*
+	 * Destroy the window if the ref count for this set of pinned
+	 * pages has dropped to zero. If it is positive then there is
+	 * a valid registered window which is backed by these pages and
+	 * it will be destroyed once all such windows are unregistered.
+	 */
+	if (!ret)
+		err = scif_destroy_pinned_pages(pinned_pages);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(scif_unpin_pages);
+
+static inline void
+scif_insert_local_window(struct scif_window *window, struct scif_endpt *ep)
+{
+	mutex_lock(&ep->rma_info.rma_lock);
+	scif_insert_window(window, &ep->rma_info.reg_list);
+	mutex_unlock(&ep->rma_info.rma_lock);
+}
+
+off_t scif_register_pinned_pages(scif_epd_t epd,
+				 scif_pinned_pages_t pinned_pages,
+				 off_t offset, int map_flags)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	s64 computed_offset;
+	struct scif_window *window;
+	int err;
+	size_t len;
+	struct device *spdev;
+
+	/* Unsupported flags */
+	if (map_flags & ~SCIF_MAP_FIXED)
+		return -EINVAL;
+
+	len = pinned_pages->nr_pages << PAGE_SHIFT;
+
+	/*
+	 * Offset is not page aligned/negative or offset+len
+	 * wraps around with SCIF_MAP_FIXED.
+	 */
+	if ((map_flags & SCIF_MAP_FIXED) &&
+	    ((ALIGN(offset, PAGE_SIZE) != offset) ||
+	    (offset < 0) ||
+	    (len > LONG_MAX - offset)))
+		return -EINVAL;
+
+	might_sleep();
+
+	err = scif_verify_epd(ep);
+	if (err)
+		return err;
+	/*
+	 * It is an error to pass pinned_pages to scif_register_pinned_pages()
+	 * after calling scif_unpin_pages().
+	 */
+	if (!atomic_add_unless(&pinned_pages->ref_count, 1, 0))
+		return -EINVAL;
+
+	/* Compute the offset for this registration */
+	err = scif_get_window_offset(ep, map_flags, offset,
+				     len, &computed_offset);
+	if (err) {
+		atomic_sub(1, &pinned_pages->ref_count);
+		return err;
+	}
+
+	/* Allocate and prepare self registration window */
+	window = scif_create_window(ep, pinned_pages->nr_pages,
+				    computed_offset, false);
+	if (!window) {
+		atomic_sub(1, &pinned_pages->ref_count);
+		scif_free_window_offset(ep, NULL, computed_offset);
+		return -ENOMEM;
+	}
+
+	window->pinned_pages = pinned_pages;
+	window->nr_pages = pinned_pages->nr_pages;
+	window->prot = pinned_pages->prot;
+
+	spdev = scif_get_peer_dev(ep->remote_dev);
+	if (IS_ERR(spdev)) {
+		err = PTR_ERR(spdev);
+		scif_destroy_window(ep, window);
+		return err;
+	}
+	err = scif_send_alloc_request(ep, window);
+	if (err) {
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %d\n", __func__, __LINE__, err);
+		goto error_unmap;
+	}
+
+	/* Prepare the remote registration window */
+	err = scif_prep_remote_window(ep, window);
+	if (err) {
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %d\n", __func__, __LINE__, err);
+		goto error_unmap;
+	}
+
+	/* Tell the peer about the new window */
+	err = scif_send_scif_register(ep, window);
+	if (err) {
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %d\n", __func__, __LINE__, err);
+		goto error_unmap;
+	}
+
+	scif_put_peer_dev(spdev);
+	/* No further failures expected. Insert new window */
+	scif_insert_local_window(window, ep);
+	return computed_offset;
+error_unmap:
+	scif_destroy_window(ep, window);
+	scif_put_peer_dev(spdev);
+	dev_err(&ep->remote_dev->sdev->dev,
+		"%s %d err %d\n", __func__, __LINE__, err);
+	return err;
+}
+EXPORT_SYMBOL_GPL(scif_register_pinned_pages);
+
+off_t scif_register(scif_epd_t epd, void *addr, size_t len, off_t offset,
+		    int prot, int map_flags)
+{
+	scif_pinned_pages_t pinned_pages;
+	off_t err;
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	s64 computed_offset;
+	struct scif_window *window;
+	struct mm_struct *mm = NULL;
+	struct device *spdev;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI register: ep %p addr %p len 0x%lx offset 0x%lx prot 0x%x map_flags 0x%x\n",
+		epd, addr, len, offset, prot, map_flags);
+	/* Unsupported flags */
+	if (map_flags & ~(SCIF_MAP_FIXED | SCIF_MAP_KERNEL))
+		return -EINVAL;
+
+	/*
+	 * Offset is not page aligned/negative or offset+len
+	 * wraps around with SCIF_MAP_FIXED.
+	 */
+	if ((map_flags & SCIF_MAP_FIXED) &&
+	    ((ALIGN(offset, PAGE_SIZE) != offset) ||
+	    (offset < 0) ||
+	    (len > LONG_MAX - offset)))
+		return -EINVAL;
+
+	/* Unsupported protection requested */
+	if (prot & ~(SCIF_PROT_READ | SCIF_PROT_WRITE))
+		return -EINVAL;
+
+	/* addr/len must be page aligned. len should be non zero */
+	if (!len || (ALIGN((u64)addr, PAGE_SIZE) != (u64)addr) ||
+	    (ALIGN(len, PAGE_SIZE) != len))
+		return -EINVAL;
+
+	might_sleep();
+
+	err = scif_verify_epd(ep);
+	if (err)
+		return err;
+
+	/* Compute the offset for this registration */
+	err = scif_get_window_offset(ep, map_flags, offset,
+				     len >> PAGE_SHIFT, &computed_offset);
+	if (err)
+		return err;
+
+	spdev = scif_get_peer_dev(ep->remote_dev);
+	if (IS_ERR(spdev)) {
+		err = PTR_ERR(spdev);
+		scif_free_window_offset(ep, NULL, computed_offset);
+		return err;
+	}
+	/* Allocate and prepare self registration window */
+	window = scif_create_window(ep, len >> PAGE_SHIFT,
+				    computed_offset, false);
+	if (!window) {
+		scif_free_window_offset(ep, NULL, computed_offset);
+		scif_put_peer_dev(spdev);
+		return -ENOMEM;
+	}
+
+	window->nr_pages = len >> PAGE_SHIFT;
+
+	err = scif_send_alloc_request(ep, window);
+	if (err) {
+		scif_destroy_incomplete_window(ep, window);
+		scif_put_peer_dev(spdev);
+		return err;
+	}
+
+	if (!(map_flags & SCIF_MAP_KERNEL)) {
+		mm = __scif_acquire_mm();
+		map_flags |= SCIF_MAP_ULIMIT;
+	}
+	/* Pin down the pages */
+	err = __scif_pin_pages(addr, len, &prot,
+			       map_flags & (SCIF_MAP_KERNEL | SCIF_MAP_ULIMIT),
+			       &pinned_pages);
+	if (err) {
+		scif_destroy_incomplete_window(ep, window);
+		__scif_release_mm(mm);
+		goto error;
+	}
+
+	window->pinned_pages = pinned_pages;
+	window->prot = pinned_pages->prot;
+	window->mm = mm;
+
+	/* Prepare the remote registration window */
+	err = scif_prep_remote_window(ep, window);
+	if (err) {
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %ld\n", __func__, __LINE__, err);
+		goto error_unmap;
+	}
+
+	/* Tell the peer about the new window */
+	err = scif_send_scif_register(ep, window);
+	if (err) {
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %ld\n", __func__, __LINE__, err);
+		goto error_unmap;
+	}
+
+	scif_put_peer_dev(spdev);
+	/* No further failures expected. Insert new window */
+	scif_insert_local_window(window, ep);
+	dev_dbg(&ep->remote_dev->sdev->dev,
+		"SCIFAPI register: ep %p addr %p len 0x%lx computed_offset 0x%llx\n",
+		epd, addr, len, computed_offset);
+	return computed_offset;
+error_unmap:
+	scif_destroy_window(ep, window);
+error:
+	scif_put_peer_dev(spdev);
+	dev_err(&ep->remote_dev->sdev->dev,
+		"%s %d err %ld\n", __func__, __LINE__, err);
+	return err;
+}
+EXPORT_SYMBOL_GPL(scif_register);
+
+int
+scif_unregister(scif_epd_t epd, off_t offset, size_t len)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	struct scif_window *window = NULL;
+	struct scif_rma_req req;
+	int nr_pages, err;
+	struct device *spdev;
+
+	dev_dbg(scif_info.mdev.this_device,
+		"SCIFAPI unregister: ep %p offset 0x%lx len 0x%lx\n",
+		ep, offset, len);
+	/* len must be page aligned. len should be non zero */
+	if (!len ||
+	    (ALIGN((u64)len, PAGE_SIZE) != (u64)len))
+		return -EINVAL;
+
+	/* Offset is not page aligned or offset+len wraps around */
+	if ((ALIGN(offset, PAGE_SIZE) != offset) ||
+	    (offset < 0) ||
+	    (len > LONG_MAX - offset))
+		return -EINVAL;
+
+	err = scif_verify_epd(ep);
+	if (err)
+		return err;
+
+	might_sleep();
+	nr_pages = len >> PAGE_SHIFT;
+
+	req.out_window = &window;
+	req.offset = offset;
+	req.prot = 0;
+	req.nr_bytes = len;
+	req.type = SCIF_WINDOW_FULL;
+	req.head = &ep->rma_info.reg_list;
+
+	spdev = scif_get_peer_dev(ep->remote_dev);
+	if (IS_ERR(spdev)) {
+		err = PTR_ERR(spdev);
+		return err;
+	}
+	mutex_lock(&ep->rma_info.rma_lock);
+	/* Does a valid window exist? */
+	err = scif_query_window(&req);
+	if (err) {
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %d\n", __func__, __LINE__, err);
+		goto error;
+	}
+	/* Unregister all the windows in this range */
+	err = scif_rma_list_unregister(window, offset, nr_pages);
+	if (err)
+		dev_err(&ep->remote_dev->sdev->dev,
+			"%s %d err %d\n", __func__, __LINE__, err);
+error:
+	mutex_unlock(&ep->rma_info.rma_lock);
+	scif_put_peer_dev(spdev);
+	return err;
+}
+EXPORT_SYMBOL_GPL(scif_unregister);
diff --git a/drivers/misc/mic/scif/scif_rma.h b/drivers/misc/mic/scif/scif_rma.h
new file mode 100644
index 000000000..fa6722279
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_rma.h
@@ -0,0 +1,464 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in
+ *   the documentation and/or other materials provided with the
+ *   distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ *   contributors may be used to endorse or promote products derived
+ *   from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#ifndef SCIF_RMA_H
+#define SCIF_RMA_H
+
+#include <linux/dma_remapping.h>
+#include <linux/mmu_notifier.h>
+
+#include "../bus/scif_bus.h"
+
+/* If this bit is set then the mark is a remote fence mark */
+#define SCIF_REMOTE_FENCE_BIT          31
+/* Magic value used to indicate a remote fence request */
+#define SCIF_REMOTE_FENCE BIT_ULL(SCIF_REMOTE_FENCE_BIT)
+
+#define SCIF_MAX_UNALIGNED_BUF_SIZE (1024 * 1024ULL)
+#define SCIF_KMEM_UNALIGNED_BUF_SIZE (SCIF_MAX_UNALIGNED_BUF_SIZE + \
+				      (L1_CACHE_BYTES << 1))
+
+#define SCIF_IOVA_START_PFN		(1)
+#define SCIF_IOVA_PFN(addr) ((addr) >> PAGE_SHIFT)
+#define SCIF_DMA_64BIT_PFN SCIF_IOVA_PFN(DMA_BIT_MASK(64))
+#define SCIF_DMA_63BIT_PFN SCIF_IOVA_PFN(DMA_BIT_MASK(63))
+
+/*
+ * struct scif_endpt_rma_info - Per Endpoint Remote Memory Access Information
+ *
+ * @reg_list: List of registration windows for self
+ * @remote_reg_list: List of registration windows for peer
+ * @iovad: Offset generator
+ * @rma_lock: Synchronizes access to self/remote list and also protects the
+ *	      window from being destroyed while RMAs are in progress.
+ * @tc_lock: Synchronizes access to temporary cached windows list
+ *	     for SCIF Registration Caching.
+ * @mmn_lock: Synchronizes access to the list of MMU notifiers registered
+ * @tw_refcount: Keeps track of number of outstanding temporary registered
+ *		 windows created by scif_vreadfrom/scif_vwriteto which have
+ *		 not been destroyed.
+ * @tcw_refcount: Same as tw_refcount but for temporary cached windows
+ * @tcw_total_pages: Same as tcw_refcount but in terms of pages pinned
+ * @mmn_list: MMU notifier so that we can destroy the windows when required
+ * @fence_refcount: Keeps track of number of outstanding remote fence
+ *		    requests which have been received by the peer.
+ * @dma_chan: DMA channel used for all DMA transfers for this endpoint.
+ * @async_list_del: Detect asynchronous list entry deletion
+ * @vma_list: List of vmas with remote memory mappings
+ * @markwq: Wait queue used for scif_fence_mark/scif_fence_wait
+*/
+struct scif_endpt_rma_info {
+	struct list_head reg_list;
+	struct list_head remote_reg_list;
+	struct iova_domain iovad;
+	struct mutex rma_lock;
+	spinlock_t tc_lock;
+	struct mutex mmn_lock;
+	atomic_t tw_refcount;
+	atomic_t tcw_refcount;
+	atomic_t tcw_total_pages;
+	struct list_head mmn_list;
+	atomic_t fence_refcount;
+	struct dma_chan	*dma_chan;
+	int async_list_del;
+	struct list_head vma_list;
+	wait_queue_head_t markwq;
+};
+
+/*
+ * struct scif_fence_info - used for tracking fence requests
+ *
+ * @state: State of this transfer
+ * @wq: Fences wait on this queue
+ * @dma_mark: Used for storing the DMA mark
+ */
+struct scif_fence_info {
+	enum scif_msg_state state;
+	struct completion comp;
+	int dma_mark;
+};
+
+/*
+ * struct scif_remote_fence_info - used for tracking remote fence requests
+ *
+ * @msg: List of SCIF node QP fence messages
+ * @list: Link to list of remote fence requests
+ */
+struct scif_remote_fence_info {
+	struct scifmsg msg;
+	struct list_head list;
+};
+
+/*
+ * Specifies whether an RMA operation can span across partial windows, a single
+ * window or multiple contiguous windows. Mmaps can span across partial windows.
+ * Unregistration can span across complete windows. scif_get_pages() can span a
+ * single window. A window can also be of type self or peer.
+ */
+enum scif_window_type {
+	SCIF_WINDOW_PARTIAL,
+	SCIF_WINDOW_SINGLE,
+	SCIF_WINDOW_FULL,
+	SCIF_WINDOW_SELF,
+	SCIF_WINDOW_PEER
+};
+
+/* The number of physical addresses that can be stored in a PAGE. */
+#define SCIF_NR_ADDR_IN_PAGE   (0x1000 >> 3)
+
+/*
+ * struct scif_rma_lookup - RMA lookup data structure for page list transfers
+ *
+ * Store an array of lookup offsets. Each offset in this array maps
+ * one 4K page containing 512 physical addresses i.e. 2MB. 512 such
+ * offsets in a 4K page will correspond to 1GB of registered address space.
+
+ * @lookup: Array of offsets
+ * @offset: DMA offset of lookup array
+ */
+struct scif_rma_lookup {
+	dma_addr_t *lookup;
+	dma_addr_t offset;
+};
+
+/*
+ * struct scif_pinned_pages - A set of pinned pages obtained with
+ * scif_pin_pages() which could be part of multiple registered
+ * windows across different end points.
+ *
+ * @nr_pages: Number of pages which is defined as a s64 instead of an int
+ * to avoid sign extension with buffers >= 2GB
+ * @prot: read/write protections
+ * @map_flags: Flags specified during the pin operation
+ * @ref_count: Reference count bumped in terms of number of pages
+ * @magic: A magic value
+ * @pages: Array of pointers to struct pages populated with get_user_pages(..)
+ */
+struct scif_pinned_pages {
+	s64 nr_pages;
+	int prot;
+	int map_flags;
+	atomic_t ref_count;
+	u64 magic;
+	struct page **pages;
+};
+
+/*
+ * struct scif_status - Stores DMA status update information
+ *
+ * @src_dma_addr: Source buffer DMA address
+ * @val: src location for value to be written to the destination
+ * @ep: SCIF endpoint
+ */
+struct scif_status {
+	dma_addr_t src_dma_addr;
+	u64 val;
+	struct scif_endpt *ep;
+};
+
+/*
+ * struct scif_window - Registration Window for Self and Remote
+ *
+ * @nr_pages: Number of pages which is defined as a s64 instead of an int
+ * to avoid sign extension with buffers >= 2GB
+ * @nr_contig_chunks: Number of contiguous physical chunks
+ * @prot: read/write protections
+ * @ref_count: reference count in terms of number of pages
+ * @magic: Cookie to detect corruption
+ * @offset: registered offset
+ * @va_for_temp: va address that this window represents
+ * @dma_mark: Used to determine if all DMAs against the window are done
+ * @ep: Pointer to EP. Useful for passing EP around with messages to
+	avoid expensive list traversals.
+ * @list: link to list of windows for the endpoint
+ * @type: self or peer window
+ * @peer_window: Pointer to peer window. Useful for sending messages to peer
+ *		 without requiring an extra list traversal
+ * @unreg_state: unregistration state
+ * @offset_freed: True if the offset has been freed
+ * @temp: True for temporary windows created via scif_vreadfrom/scif_vwriteto
+ * @mm: memory descriptor for the task_struct which initiated the RMA
+ * @st: scatter gather table for DMA mappings with IOMMU enabled
+ * @pinned_pages: The set of pinned_pages backing this window
+ * @alloc_handle: Handle for sending ALLOC_REQ
+ * @regwq: Wait Queue for an registration (N)ACK
+ * @reg_state: Registration state
+ * @unregwq: Wait Queue for an unregistration (N)ACK
+ * @dma_addr_lookup: Lookup for physical addresses used for DMA
+ * @nr_lookup: Number of entries in lookup
+ * @mapped_offset: Offset used to map the window by the peer
+ * @dma_addr: Array of physical addresses used for Mgmt node & MIC initiated DMA
+ * @num_pages: Array specifying number of pages for each physical address
+ */
+struct scif_window {
+	s64 nr_pages;
+	int nr_contig_chunks;
+	int prot;
+	int ref_count;
+	u64 magic;
+	s64 offset;
+	unsigned long va_for_temp;
+	int dma_mark;
+	u64 ep;
+	struct list_head list;
+	enum scif_window_type type;
+	u64 peer_window;
+	enum scif_msg_state unreg_state;
+	bool offset_freed;
+	bool temp;
+	struct mm_struct *mm;
+	struct sg_table *st;
+	union {
+		struct {
+			struct scif_pinned_pages *pinned_pages;
+			struct scif_allocmsg alloc_handle;
+			wait_queue_head_t regwq;
+			enum scif_msg_state reg_state;
+			wait_queue_head_t unregwq;
+		};
+		struct {
+			struct scif_rma_lookup dma_addr_lookup;
+			struct scif_rma_lookup num_pages_lookup;
+			int nr_lookup;
+			dma_addr_t mapped_offset;
+		};
+	};
+	dma_addr_t *dma_addr;
+	u64 *num_pages;
+} __packed;
+
+/*
+ * scif_mmu_notif - SCIF mmu notifier information
+ *
+ * @mmu_notifier ep_mmu_notifier: MMU notifier operations
+ * @tc_reg_list: List of temp registration windows for self
+ * @mm: memory descriptor for the task_struct which initiated the RMA
+ * @ep: SCIF endpoint
+ * @list: link to list of MMU notifier information
+ */
+struct scif_mmu_notif {
+#ifdef CONFIG_MMU_NOTIFIER
+	struct mmu_notifier ep_mmu_notifier;
+#endif
+	struct list_head tc_reg_list;
+	struct mm_struct *mm;
+	struct scif_endpt *ep;
+	struct list_head list;
+};
+
+enum scif_rma_dir {
+	SCIF_LOCAL_TO_REMOTE,
+	SCIF_REMOTE_TO_LOCAL
+};
+
+extern struct kmem_cache *unaligned_cache;
+/* Initialize RMA for this EP */
+void scif_rma_ep_init(struct scif_endpt *ep);
+/* Check if epd can be uninitialized */
+int scif_rma_ep_can_uninit(struct scif_endpt *ep);
+/* Obtain a new offset. Callee must grab RMA lock */
+int scif_get_window_offset(struct scif_endpt *ep, int flags,
+			   s64 offset, int nr_pages, s64 *out_offset);
+/* Free offset. Callee must grab RMA lock */
+void scif_free_window_offset(struct scif_endpt *ep,
+			     struct scif_window *window, s64 offset);
+/* Create self registration window */
+struct scif_window *scif_create_window(struct scif_endpt *ep, int nr_pages,
+				       s64 offset, bool temp);
+/* Destroy self registration window.*/
+int scif_destroy_window(struct scif_endpt *ep, struct scif_window *window);
+void scif_unmap_window(struct scif_dev *remote_dev, struct scif_window *window);
+/* Map pages of self window to Aperture/PCI */
+int scif_map_window(struct scif_dev *remote_dev,
+		    struct scif_window *window);
+/* Unregister a self window */
+int scif_unregister_window(struct scif_window *window);
+/* Destroy remote registration window */
+void
+scif_destroy_remote_window(struct scif_window *window);
+/* remove valid remote memory mappings from process address space */
+void scif_zap_mmaps(int node);
+/* Query if any applications have remote memory mappings */
+bool scif_rma_do_apps_have_mmaps(int node);
+/* Cleanup remote registration lists for zombie endpoints */
+void scif_cleanup_rma_for_zombies(int node);
+/* Reserve a DMA channel for a particular endpoint */
+int scif_reserve_dma_chan(struct scif_endpt *ep);
+/* Setup a DMA mark for an endpoint */
+int _scif_fence_mark(scif_epd_t epd, int *mark);
+int scif_prog_signal(scif_epd_t epd, off_t offset, u64 val,
+		     enum scif_window_type type);
+void scif_alloc_req(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_alloc_gnt_rej(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_free_virt(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_reg(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_unreg(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_reg_ack(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_reg_nack(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_unreg_ack(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_unreg_nack(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_munmap(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_mark(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_mark_resp(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_wait(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_wait_resp(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_sig_local(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_sig_remote(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_recv_sig_resp(struct scif_dev *scifdev, struct scifmsg *msg);
+void scif_mmu_notif_handler(struct work_struct *work);
+void scif_rma_handle_remote_fences(void);
+void scif_rma_destroy_windows(void);
+void scif_rma_destroy_tcw_invalid(void);
+int scif_drain_dma_intr(struct scif_hw_dev *sdev, struct dma_chan *chan);
+
+struct scif_window_iter {
+	s64 offset;
+	int index;
+};
+
+static inline void
+scif_init_window_iter(struct scif_window *window, struct scif_window_iter *iter)
+{
+	iter->offset = window->offset;
+	iter->index = 0;
+}
+
+dma_addr_t scif_off_to_dma_addr(struct scif_window *window, s64 off,
+				size_t *nr_bytes,
+				struct scif_window_iter *iter);
+static inline
+dma_addr_t __scif_off_to_dma_addr(struct scif_window *window, s64 off)
+{
+	return scif_off_to_dma_addr(window, off, NULL, NULL);
+}
+
+static inline bool scif_unaligned(off_t src_offset, off_t dst_offset)
+{
+	src_offset = src_offset & (L1_CACHE_BYTES - 1);
+	dst_offset = dst_offset & (L1_CACHE_BYTES - 1);
+	return !(src_offset == dst_offset);
+}
+
+/*
+ * scif_zalloc:
+ * @size: Size of the allocation request.
+ *
+ * Helper API which attempts to allocate zeroed pages via
+ * __get_free_pages(..) first and then falls back on
+ * vzalloc(..) if that fails.
+ */
+static inline void *scif_zalloc(size_t size)
+{
+	void *ret = NULL;
+	size_t align = ALIGN(size, PAGE_SIZE);
+
+	if (align && get_order(align) < MAX_ORDER)
+		ret = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+					       get_order(align));
+	return ret ? ret : vzalloc(align);
+}
+
+/*
+ * scif_free:
+ * @addr: Address to be freed.
+ * @size: Size of the allocation.
+ * Helper API which frees memory allocated via scif_zalloc().
+ */
+static inline void scif_free(void *addr, size_t size)
+{
+	size_t align = ALIGN(size, PAGE_SIZE);
+
+	if (is_vmalloc_addr(addr))
+		vfree(addr);
+	else
+		free_pages((unsigned long)addr, get_order(align));
+}
+
+static inline void scif_get_window(struct scif_window *window, int nr_pages)
+{
+	window->ref_count += nr_pages;
+}
+
+static inline void scif_put_window(struct scif_window *window, int nr_pages)
+{
+	window->ref_count -= nr_pages;
+}
+
+static inline void scif_set_window_ref(struct scif_window *window, int nr_pages)
+{
+	window->ref_count = nr_pages;
+}
+
+static inline void
+scif_queue_for_cleanup(struct scif_window *window, struct list_head *list)
+{
+	spin_lock(&scif_info.rmalock);
+	list_add_tail(&window->list, list);
+	spin_unlock(&scif_info.rmalock);
+	schedule_work(&scif_info.misc_work);
+}
+
+static inline void __scif_rma_destroy_tcw_helper(struct scif_window *window)
+{
+	list_del_init(&window->list);
+	scif_queue_for_cleanup(window, &scif_info.rma_tc);
+}
+
+static inline bool scif_is_iommu_enabled(void)
+{
+#ifdef CONFIG_INTEL_IOMMU
+	return intel_iommu_enabled;
+#else
+	return false;
+#endif
+}
+#endif /* SCIF_RMA_H */
diff --git a/drivers/misc/mic/scif/scif_rma_list.c b/drivers/misc/mic/scif/scif_rma_list.c
new file mode 100644
index 000000000..a036dbb41
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_rma_list.c
@@ -0,0 +1,291 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include "scif_main.h"
+#include <linux/mmu_notifier.h>
+#include <linux/highmem.h>
+
+/*
+ * scif_insert_tcw:
+ *
+ * Insert a temp window to the temp registration list sorted by va_for_temp.
+ * RMA lock must be held.
+ */
+void scif_insert_tcw(struct scif_window *window, struct list_head *head)
+{
+	struct scif_window *curr = NULL;
+	struct scif_window *prev = list_entry(head, struct scif_window, list);
+	struct list_head *item;
+
+	INIT_LIST_HEAD(&window->list);
+	/* Compare with tail and if the entry is new tail add it to the end */
+	if (!list_empty(head)) {
+		curr = list_entry(head->prev, struct scif_window, list);
+		if (curr->va_for_temp < window->va_for_temp) {
+			list_add_tail(&window->list, head);
+			return;
+		}
+	}
+	list_for_each(item, head) {
+		curr = list_entry(item, struct scif_window, list);
+		if (curr->va_for_temp > window->va_for_temp)
+			break;
+		prev = curr;
+	}
+	list_add(&window->list, &prev->list);
+}
+
+/*
+ * scif_insert_window:
+ *
+ * Insert a window to the self registration list sorted by offset.
+ * RMA lock must be held.
+ */
+void scif_insert_window(struct scif_window *window, struct list_head *head)
+{
+	struct scif_window *curr = NULL, *prev = NULL;
+	struct list_head *item;
+
+	INIT_LIST_HEAD(&window->list);
+	list_for_each(item, head) {
+		curr = list_entry(item, struct scif_window, list);
+		if (curr->offset > window->offset)
+			break;
+		prev = curr;
+	}
+	if (!prev)
+		list_add(&window->list, head);
+	else
+		list_add(&window->list, &prev->list);
+	scif_set_window_ref(window, window->nr_pages);
+}
+
+/*
+ * scif_query_tcw:
+ *
+ * Query the temp cached registration list of ep for an overlapping window
+ * in case of permission mismatch, destroy the previous window. if permissions
+ * match and overlap is partial, destroy the window but return the new range
+ * RMA lock must be held.
+ */
+int scif_query_tcw(struct scif_endpt *ep, struct scif_rma_req *req)
+{
+	struct list_head *item, *temp, *head = req->head;
+	struct scif_window *window;
+	u64 start_va_window, start_va_req = req->va_for_temp;
+	u64 end_va_window, end_va_req = start_va_req + req->nr_bytes;
+
+	if (!req->nr_bytes)
+		return -EINVAL;
+	/*
+	 * Avoid traversing the entire list to find out that there
+	 * is no entry that matches
+	 */
+	if (!list_empty(head)) {
+		window = list_last_entry(head, struct scif_window, list);
+		end_va_window = window->va_for_temp +
+			(window->nr_pages << PAGE_SHIFT);
+		if (start_va_req > end_va_window)
+			return -ENXIO;
+	}
+	list_for_each_safe(item, temp, head) {
+		window = list_entry(item, struct scif_window, list);
+		start_va_window = window->va_for_temp;
+		end_va_window = window->va_for_temp +
+			(window->nr_pages << PAGE_SHIFT);
+		if (start_va_req < start_va_window &&
+		    end_va_req < start_va_window)
+			break;
+		if (start_va_req >= end_va_window)
+			continue;
+		if ((window->prot & req->prot) == req->prot) {
+			if (start_va_req >= start_va_window &&
+			    end_va_req <= end_va_window) {
+				*req->out_window = window;
+				return 0;
+			}
+			/* expand window */
+			if (start_va_req < start_va_window) {
+				req->nr_bytes +=
+					start_va_window - start_va_req;
+				req->va_for_temp = start_va_window;
+			}
+			if (end_va_req >= end_va_window)
+				req->nr_bytes += end_va_window - end_va_req;
+		}
+		/* Destroy the old window to create a new one */
+		__scif_rma_destroy_tcw_helper(window);
+		break;
+	}
+	return -ENXIO;
+}
+
+/*
+ * scif_query_window:
+ *
+ * Query the registration list and check if a valid contiguous
+ * range of windows exist.
+ * RMA lock must be held.
+ */
+int scif_query_window(struct scif_rma_req *req)
+{
+	struct list_head *item;
+	struct scif_window *window;
+	s64 end_offset, offset = req->offset;
+	u64 tmp_min, nr_bytes_left = req->nr_bytes;
+
+	if (!req->nr_bytes)
+		return -EINVAL;
+
+	list_for_each(item, req->head) {
+		window = list_entry(item, struct scif_window, list);
+		end_offset = window->offset +
+			(window->nr_pages << PAGE_SHIFT);
+		if (offset < window->offset)
+			/* Offset not found! */
+			return -ENXIO;
+		if (offset >= end_offset)
+			continue;
+		/* Check read/write protections. */
+		if ((window->prot & req->prot) != req->prot)
+			return -EPERM;
+		if (nr_bytes_left == req->nr_bytes)
+			/* Store the first window */
+			*req->out_window = window;
+		tmp_min = min((u64)end_offset - offset, nr_bytes_left);
+		nr_bytes_left -= tmp_min;
+		offset += tmp_min;
+		/*
+		 * Range requested encompasses
+		 * multiple windows contiguously.
+		 */
+		if (!nr_bytes_left) {
+			/* Done for partial window */
+			if (req->type == SCIF_WINDOW_PARTIAL ||
+			    req->type == SCIF_WINDOW_SINGLE)
+				return 0;
+			/* Extra logic for full windows */
+			if (offset == end_offset)
+				/* Spanning multiple whole windows */
+				return 0;
+				/* Not spanning multiple whole windows */
+			return -ENXIO;
+		}
+		if (req->type == SCIF_WINDOW_SINGLE)
+			break;
+	}
+	dev_err(scif_info.mdev.this_device,
+		"%s %d ENXIO\n", __func__, __LINE__);
+	return -ENXIO;
+}
+
+/*
+ * scif_rma_list_unregister:
+ *
+ * Traverse the self registration list starting from window:
+ * 1) Call scif_unregister_window(..)
+ * RMA lock must be held.
+ */
+int scif_rma_list_unregister(struct scif_window *window,
+			     s64 offset, int nr_pages)
+{
+	struct scif_endpt *ep = (struct scif_endpt *)window->ep;
+	struct list_head *head = &ep->rma_info.reg_list;
+	s64 end_offset;
+	int err = 0;
+	int loop_nr_pages;
+	struct scif_window *_window;
+
+	list_for_each_entry_safe_from(window, _window, head, list) {
+		end_offset = window->offset + (window->nr_pages << PAGE_SHIFT);
+		loop_nr_pages = min((int)((end_offset - offset) >> PAGE_SHIFT),
+				    nr_pages);
+		err = scif_unregister_window(window);
+		if (err)
+			return err;
+		nr_pages -= loop_nr_pages;
+		offset += (loop_nr_pages << PAGE_SHIFT);
+		if (!nr_pages)
+			break;
+	}
+	return 0;
+}
+
+/*
+ * scif_unmap_all_window:
+ *
+ * Traverse all the windows in the self registration list and:
+ * 1) Delete any DMA mappings created
+ */
+void scif_unmap_all_windows(scif_epd_t epd)
+{
+	struct list_head *item, *tmp;
+	struct scif_window *window;
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	struct list_head *head = &ep->rma_info.reg_list;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+	list_for_each_safe(item, tmp, head) {
+		window = list_entry(item, struct scif_window, list);
+		scif_unmap_window(ep->remote_dev, window);
+	}
+	mutex_unlock(&ep->rma_info.rma_lock);
+}
+
+/*
+ * scif_unregister_all_window:
+ *
+ * Traverse all the windows in the self registration list and:
+ * 1) Call scif_unregister_window(..)
+ * RMA lock must be held.
+ */
+int scif_unregister_all_windows(scif_epd_t epd)
+{
+	struct list_head *item, *tmp;
+	struct scif_window *window;
+	struct scif_endpt *ep = (struct scif_endpt *)epd;
+	struct list_head *head = &ep->rma_info.reg_list;
+	int err = 0;
+
+	mutex_lock(&ep->rma_info.rma_lock);
+retry:
+	item = NULL;
+	tmp = NULL;
+	list_for_each_safe(item, tmp, head) {
+		window = list_entry(item, struct scif_window, list);
+		ep->rma_info.async_list_del = 0;
+		err = scif_unregister_window(window);
+		if (err)
+			dev_err(scif_info.mdev.this_device,
+				"%s %d err %d\n",
+				__func__, __LINE__, err);
+		/*
+		 * Need to restart list traversal if there has been
+		 * an asynchronous list entry deletion.
+		 */
+		if (READ_ONCE(ep->rma_info.async_list_del))
+			goto retry;
+	}
+	mutex_unlock(&ep->rma_info.rma_lock);
+	if (!list_empty(&ep->rma_info.mmn_list)) {
+		spin_lock(&scif_info.rmalock);
+		list_add_tail(&ep->mmu_list, &scif_info.mmu_notif_cleanup);
+		spin_unlock(&scif_info.rmalock);
+		schedule_work(&scif_info.mmu_notif_work);
+	}
+	return err;
+}
diff --git a/drivers/misc/mic/scif/scif_rma_list.h b/drivers/misc/mic/scif/scif_rma_list.h
new file mode 100644
index 000000000..7d58d1d55
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_rma_list.h
@@ -0,0 +1,57 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#ifndef SCIF_RMA_LIST_H
+#define SCIF_RMA_LIST_H
+
+/*
+ * struct scif_rma_req - Self Registration list RMA Request query
+ *
+ * @out_window - Returns the window if found
+ * @offset: Starting offset
+ * @nr_bytes: number of bytes
+ * @prot: protection requested i.e. read or write or both
+ * @type: Specify single, partial or multiple windows
+ * @head: Head of list on which to search
+ * @va_for_temp: VA for searching temporary cached windows
+ */
+struct scif_rma_req {
+	struct scif_window **out_window;
+	union {
+		s64 offset;
+		unsigned long va_for_temp;
+	};
+	size_t nr_bytes;
+	int prot;
+	enum scif_window_type type;
+	struct list_head *head;
+};
+
+/* Insert */
+void scif_insert_window(struct scif_window *window, struct list_head *head);
+void scif_insert_tcw(struct scif_window *window,
+		     struct list_head *head);
+/* Query */
+int scif_query_window(struct scif_rma_req *request);
+int scif_query_tcw(struct scif_endpt *ep, struct scif_rma_req *request);
+/* Called from close to unregister all self windows */
+int scif_unregister_all_windows(scif_epd_t epd);
+void scif_unmap_all_windows(scif_epd_t epd);
+/* Traverse list and unregister */
+int scif_rma_list_unregister(struct scif_window *window, s64 offset,
+			     int nr_pages);
+#endif /* SCIF_RMA_LIST_H */