238 lines
6 KiB
C
238 lines
6 KiB
C
/*
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* Intel MIC Platform Software Stack (MPSS)
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*
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* Copyright(c) 2014 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* Intel SCIF driver.
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*
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*/
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#include "scif_peer_bus.h"
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#include "scif_main.h"
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#include "scif_map.h"
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/**
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* scif_invalidate_ep() - Set state for all connected endpoints
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* to disconnected and wake up all send/recv waitqueues
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*/
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static void scif_invalidate_ep(int node)
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{
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struct scif_endpt *ep;
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struct list_head *pos, *tmpq;
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flush_work(&scif_info.conn_work);
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mutex_lock(&scif_info.connlock);
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list_for_each_safe(pos, tmpq, &scif_info.disconnected) {
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ep = list_entry(pos, struct scif_endpt, list);
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if (ep->remote_dev->node == node) {
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scif_unmap_all_windows(ep);
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spin_lock(&ep->lock);
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scif_cleanup_ep_qp(ep);
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spin_unlock(&ep->lock);
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}
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}
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list_for_each_safe(pos, tmpq, &scif_info.connected) {
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ep = list_entry(pos, struct scif_endpt, list);
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if (ep->remote_dev->node == node) {
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list_del(pos);
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spin_lock(&ep->lock);
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ep->state = SCIFEP_DISCONNECTED;
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list_add_tail(&ep->list, &scif_info.disconnected);
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scif_cleanup_ep_qp(ep);
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wake_up_interruptible(&ep->sendwq);
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wake_up_interruptible(&ep->recvwq);
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spin_unlock(&ep->lock);
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scif_unmap_all_windows(ep);
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}
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}
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mutex_unlock(&scif_info.connlock);
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}
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void scif_free_qp(struct scif_dev *scifdev)
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{
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struct scif_qp *qp = scifdev->qpairs;
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if (!qp)
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return;
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scif_unmap_single(qp->local_buf, scifdev, qp->inbound_q.size);
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kfree(qp->inbound_q.rb_base);
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scif_unmap_single(qp->local_qp, scifdev, sizeof(struct scif_qp));
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kfree(scifdev->qpairs);
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scifdev->qpairs = NULL;
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}
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static void scif_cleanup_qp(struct scif_dev *dev)
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{
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struct scif_qp *qp = &dev->qpairs[0];
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if (!qp)
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return;
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scif_iounmap((void *)qp->remote_qp, sizeof(struct scif_qp), dev);
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scif_iounmap((void *)qp->outbound_q.rb_base,
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sizeof(struct scif_qp), dev);
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qp->remote_qp = NULL;
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qp->local_write = 0;
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qp->inbound_q.current_write_offset = 0;
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qp->inbound_q.current_read_offset = 0;
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if (scifdev_is_p2p(dev))
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scif_free_qp(dev);
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}
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void scif_send_acks(struct scif_dev *dev)
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{
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struct scifmsg msg;
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if (dev->node_remove_ack_pending) {
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msg.uop = SCIF_NODE_REMOVE_ACK;
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msg.src.node = scif_info.nodeid;
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msg.dst.node = SCIF_MGMT_NODE;
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msg.payload[0] = dev->node;
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scif_nodeqp_send(&scif_dev[SCIF_MGMT_NODE], &msg);
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dev->node_remove_ack_pending = false;
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}
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if (dev->exit_ack_pending) {
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msg.uop = SCIF_EXIT_ACK;
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msg.src.node = scif_info.nodeid;
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msg.dst.node = dev->node;
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scif_nodeqp_send(dev, &msg);
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dev->exit_ack_pending = false;
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}
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}
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/*
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* scif_cleanup_scifdev
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*
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* @dev: Remote SCIF device.
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* Uninitialize SCIF data structures for remote SCIF device.
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*/
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void scif_cleanup_scifdev(struct scif_dev *dev)
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{
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struct scif_hw_dev *sdev = dev->sdev;
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if (!dev->sdev)
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return;
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if (scifdev_is_p2p(dev)) {
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if (dev->cookie) {
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sdev->hw_ops->free_irq(sdev, dev->cookie, dev);
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dev->cookie = NULL;
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}
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scif_destroy_intr_wq(dev);
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}
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flush_work(&scif_info.misc_work);
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scif_destroy_p2p(dev);
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scif_invalidate_ep(dev->node);
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scif_zap_mmaps(dev->node);
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scif_cleanup_rma_for_zombies(dev->node);
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flush_work(&scif_info.misc_work);
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scif_send_acks(dev);
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if (!dev->node && scif_info.card_initiated_exit) {
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/*
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* Send an SCIF_EXIT message which is the last message from MIC
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* to the Host and wait for a SCIF_EXIT_ACK
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*/
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scif_send_exit(dev);
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scif_info.card_initiated_exit = false;
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}
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scif_cleanup_qp(dev);
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}
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/*
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* scif_remove_node:
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*
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* @node: Node to remove
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*/
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void scif_handle_remove_node(int node)
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{
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struct scif_dev *scifdev = &scif_dev[node];
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if (scif_peer_unregister_device(scifdev))
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scif_send_acks(scifdev);
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}
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static int scif_send_rmnode_msg(int node, int remove_node)
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{
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struct scifmsg notif_msg;
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struct scif_dev *dev = &scif_dev[node];
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notif_msg.uop = SCIF_NODE_REMOVE;
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notif_msg.src.node = scif_info.nodeid;
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notif_msg.dst.node = node;
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notif_msg.payload[0] = remove_node;
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return scif_nodeqp_send(dev, ¬if_msg);
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}
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/**
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* scif_node_disconnect:
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*
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* @node_id[in]: source node id.
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* @mgmt_initiated: Disconnection initiated from the mgmt node
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*
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* Disconnect a node from the scif network.
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*/
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void scif_disconnect_node(u32 node_id, bool mgmt_initiated)
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{
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int ret;
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int msg_cnt = 0;
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u32 i = 0;
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struct scif_dev *scifdev = &scif_dev[node_id];
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if (!node_id)
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return;
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atomic_set(&scifdev->disconn_rescnt, 0);
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/* Destroy p2p network */
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for (i = 1; i <= scif_info.maxid; i++) {
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if (i == node_id)
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continue;
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ret = scif_send_rmnode_msg(i, node_id);
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if (!ret)
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msg_cnt++;
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}
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/* Wait for the remote nodes to respond with SCIF_NODE_REMOVE_ACK */
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ret = wait_event_timeout(scifdev->disconn_wq,
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(atomic_read(&scifdev->disconn_rescnt)
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== msg_cnt), SCIF_NODE_ALIVE_TIMEOUT);
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/* Tell the card to clean up */
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if (mgmt_initiated && _scifdev_alive(scifdev))
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/*
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* Send an SCIF_EXIT message which is the last message from Host
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* to the MIC and wait for a SCIF_EXIT_ACK
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*/
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scif_send_exit(scifdev);
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atomic_set(&scifdev->disconn_rescnt, 0);
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/* Tell the mgmt node to clean up */
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ret = scif_send_rmnode_msg(SCIF_MGMT_NODE, node_id);
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if (!ret)
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/* Wait for mgmt node to respond with SCIF_NODE_REMOVE_ACK */
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wait_event_timeout(scifdev->disconn_wq,
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(atomic_read(&scifdev->disconn_rescnt) == 1),
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SCIF_NODE_ALIVE_TIMEOUT);
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}
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void scif_get_node_info(void)
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{
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struct scifmsg msg;
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DECLARE_COMPLETION_ONSTACK(node_info);
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msg.uop = SCIF_GET_NODE_INFO;
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msg.src.node = scif_info.nodeid;
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msg.dst.node = SCIF_MGMT_NODE;
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msg.payload[3] = (u64)&node_info;
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if ((scif_nodeqp_send(&scif_dev[SCIF_MGMT_NODE], &msg)))
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return;
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/* Wait for a response with SCIF_GET_NODE_INFO */
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wait_for_completion(&node_info);
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}
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