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/*
* 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) {
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);
}
}
mutex_unlock(&scif_info.connlock);
}
void scif_free_qp(struct scif_dev *scifdev)
{
struct scif_qp *qp = scifdev->qpairs;
if (!qp)
return;
scif_free_coherent((void *)qp->inbound_q.rb_base,
qp->local_buf, scifdev, qp->inbound_q.size);
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);
}
scif_destroy_p2p(dev);
scif_invalidate_ep(dev->node);
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];
struct scif_peer_dev *spdev;
rcu_read_lock();
spdev = rcu_dereference(scifdev->spdev);
rcu_read_unlock();
if (spdev)
scif_peer_unregister_device(spdev);
else
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, ¬if_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);
}
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