kernel/drivers/misc/mic/scif/scif_nm.c

   1 /*
   2  * Intel MIC Platform Software Stack (MPSS)
   3  *
   4  * Copyright(c) 2014 Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License, version 2, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * Intel SCIF driver.
  16  *
  17  */
  18 #include "scif_peer_bus.h"
  19
  20 #include "scif_main.h"
  21 #include "scif_map.h"
  22
  23 /**
  24  * scif_invalidate_ep() - Set state for all connected endpoints
  25  * to disconnected and wake up all send/recv waitqueues
  26  */
  27 static void scif_invalidate_ep(int node)
  28 {
  29         struct scif_endpt *ep;
  30         struct list_head *pos, *tmpq;
  31
  32         flush_work(&scif_info.conn_work);
  33         mutex_lock(&scif_info.connlock);
  34         list_for_each_safe(pos, tmpq, &scif_info.disconnected) {
  35                 ep = list_entry(pos, struct scif_endpt, list);
  36                 if (ep->remote_dev->node == node) {
  37                         scif_unmap_all_windows(ep);
  38                         spin_lock(&ep->lock);
  39                         scif_cleanup_ep_qp(ep);
  40                         spin_unlock(&ep->lock);
  41                 }
  42         }
  43         list_for_each_safe(pos, tmpq, &scif_info.connected) {
  44                 ep = list_entry(pos, struct scif_endpt, list);
  45                 if (ep->remote_dev->node == node) {
  46                         list_del(pos);
  47                         spin_lock(&ep->lock);
  48                         ep->state = SCIFEP_DISCONNECTED;
  49                         list_add_tail(&ep->list, &scif_info.disconnected);
  50                         scif_cleanup_ep_qp(ep);
  51                         wake_up_interruptible(&ep->sendwq);
  52                         wake_up_interruptible(&ep->recvwq);
  53                         spin_unlock(&ep->lock);
  54                         scif_unmap_all_windows(ep);
  55                 }
  56         }
  57         mutex_unlock(&scif_info.connlock);
  58 }
  59
  60 void scif_free_qp(struct scif_dev *scifdev)
  61 {
  62         struct scif_qp *qp = scifdev->qpairs;
  63
  64         if (!qp)
  65                 return;
  66         scif_unmap_single(qp->local_buf, scifdev, qp->inbound_q.size);
  67         kfree(qp->inbound_q.rb_base);
  68         scif_unmap_single(qp->local_qp, scifdev, sizeof(struct scif_qp));
  69         kfree(scifdev->qpairs);
  70         scifdev->qpairs = NULL;
  71 }
  72
  73 static void scif_cleanup_qp(struct scif_dev *dev)
  74 {
  75         struct scif_qp *qp = &dev->qpairs[0];
  76
  77         if (!qp)
  78                 return;
  79         scif_iounmap((void *)qp->remote_qp, sizeof(struct scif_qp), dev);
  80         scif_iounmap((void *)qp->outbound_q.rb_base,
  81                      sizeof(struct scif_qp), dev);
  82         qp->remote_qp = NULL;
  83         qp->local_write = 0;
  84         qp->inbound_q.current_write_offset = 0;
  85         qp->inbound_q.current_read_offset = 0;
  86         if (scifdev_is_p2p(dev))
  87                 scif_free_qp(dev);
  88 }
  89
  90 void scif_send_acks(struct scif_dev *dev)
  91 {
  92         struct scifmsg msg;
  93
  94         if (dev->node_remove_ack_pending) {
  95                 msg.uop = SCIF_NODE_REMOVE_ACK;
  96                 msg.src.node = scif_info.nodeid;
  97                 msg.dst.node = SCIF_MGMT_NODE;
  98                 msg.payload[0] = dev->node;
  99                 scif_nodeqp_send(&scif_dev[SCIF_MGMT_NODE], &msg);
 100                 dev->node_remove_ack_pending = false;
 101         }
 102         if (dev->exit_ack_pending) {
 103                 msg.uop = SCIF_EXIT_ACK;
 104                 msg.src.node = scif_info.nodeid;
 105                 msg.dst.node = dev->node;
 106                 scif_nodeqp_send(dev, &msg);
 107                 dev->exit_ack_pending = false;
 108         }
 109 }
 110
 111 /*
 112  * scif_cleanup_scifdev
 113  *
 114  * @dev: Remote SCIF device.
 115  * Uninitialize SCIF data structures for remote SCIF device.
 116  */
 117 void scif_cleanup_scifdev(struct scif_dev *dev)
 118 {
 119         struct scif_hw_dev *sdev = dev->sdev;
 120
 121         if (!dev->sdev)
 122                 return;
 123         if (scifdev_is_p2p(dev)) {
 124                 if (dev->cookie) {
 125                         sdev->hw_ops->free_irq(sdev, dev->cookie, dev);
 126                         dev->cookie = NULL;
 127                 }
 128                 scif_destroy_intr_wq(dev);
 129         }
 130         flush_work(&scif_info.misc_work);
 131         scif_destroy_p2p(dev);
 132         scif_invalidate_ep(dev->node);
 133         scif_zap_mmaps(dev->node);
 134         scif_cleanup_rma_for_zombies(dev->node);
 135         flush_work(&scif_info.misc_work);
 136         scif_send_acks(dev);
 137         if (!dev->node && scif_info.card_initiated_exit) {
 138                 /*
 139                  * Send an SCIF_EXIT message which is the last message from MIC
 140                  * to the Host and wait for a SCIF_EXIT_ACK
 141                  */
 142                 scif_send_exit(dev);
 143                 scif_info.card_initiated_exit = false;
 144         }
 145         scif_cleanup_qp(dev);
 146 }
 147
 148 /*
 149  * scif_remove_node:
 150  *
 151  * @node: Node to remove
 152  */
 153 void scif_handle_remove_node(int node)
 154 {
 155         struct scif_dev *scifdev = &scif_dev[node];
 156
 157         if (scif_peer_unregister_device(scifdev))
 158                 scif_send_acks(scifdev);
 159 }
 160
 161 static int scif_send_rmnode_msg(int node, int remove_node)
 162 {
 163         struct scifmsg notif_msg;
 164         struct scif_dev *dev = &scif_dev[node];
 165
 166         notif_msg.uop = SCIF_NODE_REMOVE;
 167         notif_msg.src.node = scif_info.nodeid;
 168         notif_msg.dst.node = node;
 169         notif_msg.payload[0] = remove_node;
 170         return scif_nodeqp_send(dev, &notif_msg);
 171 }
 172
 173 /**
 174  * scif_node_disconnect:
 175  *
 176  * @node_id[in]: source node id.
 177  * @mgmt_initiated: Disconnection initiated from the mgmt node
 178  *
 179  * Disconnect a node from the scif network.
 180  */
 181 void scif_disconnect_node(u32 node_id, bool mgmt_initiated)
 182 {
 183         int ret;
 184         int msg_cnt = 0;
 185         u32 i = 0;
 186         struct scif_dev *scifdev = &scif_dev[node_id];
 187
 188         if (!node_id)
 189                 return;
 190
 191         atomic_set(&scifdev->disconn_rescnt, 0);
 192
 193         /* Destroy p2p network */
 194         for (i = 1; i <= scif_info.maxid; i++) {
 195                 if (i == node_id)
 196                         continue;
 197                 ret = scif_send_rmnode_msg(i, node_id);
 198                 if (!ret)
 199                         msg_cnt++;
 200         }
 201         /* Wait for the remote nodes to respond with SCIF_NODE_REMOVE_ACK */
 202         ret = wait_event_timeout(scifdev->disconn_wq,
 203                                  (atomic_read(&scifdev->disconn_rescnt)
 204                                  == msg_cnt), SCIF_NODE_ALIVE_TIMEOUT);
 205         /* Tell the card to clean up */
 206         if (mgmt_initiated && _scifdev_alive(scifdev))
 207                 /*
 208                  * Send an SCIF_EXIT message which is the last message from Host
 209                  * to the MIC and wait for a SCIF_EXIT_ACK
 210                  */
 211                 scif_send_exit(scifdev);
 212         atomic_set(&scifdev->disconn_rescnt, 0);
 213         /* Tell the mgmt node to clean up */
 214         ret = scif_send_rmnode_msg(SCIF_MGMT_NODE, node_id);
 215         if (!ret)
 216                 /* Wait for mgmt node to respond with SCIF_NODE_REMOVE_ACK */
 217                 wait_event_timeout(scifdev->disconn_wq,
 218                                    (atomic_read(&scifdev->disconn_rescnt) == 1),
 219                                    SCIF_NODE_ALIVE_TIMEOUT);
 220 }
 221
 222 void scif_get_node_info(void)
 223 {
 224         struct scifmsg msg;
 225         DECLARE_COMPLETION_ONSTACK(node_info);
 226
 227         msg.uop = SCIF_GET_NODE_INFO;
 228         msg.src.node = scif_info.nodeid;
 229         msg.dst.node = SCIF_MGMT_NODE;
 230         msg.payload[3] = (u64)&node_info;
 231
 232         if ((scif_nodeqp_send(&scif_dev[SCIF_MGMT_NODE], &msg)))
 233                 return;
 234
 235         /* Wait for a response with SCIF_GET_NODE_INFO */
 236         wait_for_completion(&node_info);
 237 }