1 files changed, 353 insertions, 0 deletions
diff --git a/drivers/misc/mic/scif/scif_epd.c b/drivers/misc/mic/scif/scif_epd.c
new file mode 100644
index 000000000000..b4bfbb08a8e3
--- /dev/null
+++ b/drivers/misc/mic/scif/scif_epd.c
@@ -0,0 +1,353 @@
+/*
+ * 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)
+		spin_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)
+		spin_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;
+
+	spin_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) {
+			spin_lock(&ep->lock);
+			spin_unlock(&scif_info.eplock);
+			return ep;
+		}
+	}
+	spin_unlock(&scif_info.eplock);
+	return NULL;
+}
+
+void scif_cleanup_zombie_epd(void)
+{
+	struct list_head *pos, *tmpq;
+	struct scif_endpt *ep;
+
+	spin_lock(&scif_info.eplock);
+	list_for_each_safe(pos, tmpq, &scif_info.zombie) {
+		ep = list_entry(pos, struct scif_endpt, list);
+		list_del(pos);
+		scif_info.nr_zombies--;
+		kfree(ep);
+	}
+	spin_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;
+
+	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);
+}