LXR linux/drivers/infiniband/hw/hfi1/verbs

   1/*
   2 * Copyright(c) 2016 - 2018 Intel Corporation.
   3 *
   4 * This file is provided under a dual BSD/GPLv2 license.  When using or
   5 * redistributing this file, you may do so under either license.
   6 *
   7 * GPL LICENSE SUMMARY
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of version 2 of the GNU General Public License as
  11 * published by the Free Software Foundation.
  12 *
  13 * This program is distributed in the hope that it will be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 * General Public License for more details.
  17 *
  18 * BSD LICENSE
  19 *
  20 * Redistribution and use in source and binary forms, with or without
  21 * modification, are permitted provided that the following conditions
  22 * are met:
  23 *
  24 *  - Redistributions of source code must retain the above copyright
  25 *    notice, this list of conditions and the following disclaimer.
  26 *  - Redistributions in binary form must reproduce the above copyright
  27 *    notice, this list of conditions and the following disclaimer in
  28 *    the documentation and/or other materials provided with the
  29 *    distribution.
  30 *  - Neither the name of Intel Corporation nor the names of its
  31 *    contributors may be used to endorse or promote products derived
  32 *    from this software without specific prior written permission.
  33 *
  34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45 *
  46 */
  47
  48#include "hfi.h"
  49#include "verbs_txreq.h"
  50#include "qp.h"
  51#include "trace.h"
  52
  53#define TXREQ_LEN 24
  54
  55void hfi1_put_txreq(struct verbs_txreq *tx)
  56{
  57        struct hfi1_ibdev *dev;
  58        struct rvt_qp *qp;
  59        unsigned long flags;
  60        unsigned int seq;
  61        struct hfi1_qp_priv *priv;
  62
  63        qp = tx->qp;
  64        dev = to_idev(qp->ibqp.device);
  65
  66        if (tx->mr)
  67                rvt_put_mr(tx->mr);
  68
  69        sdma_txclean(dd_from_dev(dev), &tx->txreq);
  70
  71        /* Free verbs_txreq and return to slab cache */
  72        kmem_cache_free(dev->verbs_txreq_cache, tx);
  73
  74        do {
  75                seq = read_seqbegin(&dev->txwait_lock);
  76                if (!list_empty(&dev->txwait)) {
  77                        struct iowait *wait;
  78
  79                        write_seqlock_irqsave(&dev->txwait_lock, flags);
  80                        wait = list_first_entry(&dev->txwait, struct iowait,
  81                                                list);
  82                        qp = iowait_to_qp(wait);
  83                        priv = qp->priv;
  84                        list_del_init(&priv->s_iowait.list);
  85                        /* refcount held until actual wake up */
  86                        write_sequnlock_irqrestore(&dev->txwait_lock, flags);
  87                        hfi1_qp_wakeup(qp, RVT_S_WAIT_TX);
  88                        break;
  89                }
  90        } while (read_seqretry(&dev->txwait_lock, seq));
  91}
  92
  93struct verbs_txreq *__get_txreq(struct hfi1_ibdev *dev,
  94                                struct rvt_qp *qp)
  95        __must_hold(&qp->s_lock)
  96{
  97        struct verbs_txreq *tx = NULL;
  98
  99        write_seqlock(&dev->txwait_lock);
 100        if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
 101                struct hfi1_qp_priv *priv;
 102
 103                tx = kmem_cache_alloc(dev->verbs_txreq_cache, VERBS_TXREQ_GFP);
 104                if (tx)
 105                        goto out;
 106                priv = qp->priv;
 107                if (list_empty(&priv->s_iowait.list)) {
 108                        dev->n_txwait++;
 109                        qp->s_flags |= RVT_S_WAIT_TX;
 110                        list_add_tail(&priv->s_iowait.list, &dev->txwait);
 111                        priv->s_iowait.lock = &dev->txwait_lock;
 112                        trace_hfi1_qpsleep(qp, RVT_S_WAIT_TX);
 113                        rvt_get_qp(qp);
 114                }
 115                qp->s_flags &= ~RVT_S_BUSY;
 116        }
 117out:
 118        write_sequnlock(&dev->txwait_lock);
 119        return tx;
 120}
 121
 122int verbs_txreq_init(struct hfi1_ibdev *dev)
 123{
 124        char buf[TXREQ_LEN];
 125        struct hfi1_devdata *dd = dd_from_dev(dev);
 126
 127        snprintf(buf, sizeof(buf), "hfi1_%u_vtxreq_cache", dd->unit);
 128        dev->verbs_txreq_cache = kmem_cache_create(buf,
 129                                                   sizeof(struct verbs_txreq),
 130                                                   0, SLAB_HWCACHE_ALIGN,
 131                                                   NULL);
 132        if (!dev->verbs_txreq_cache)
 133                return -ENOMEM;
 134        return 0;
 135}
 136
 137void verbs_txreq_exit(struct hfi1_ibdev *dev)
 138{
 139        kmem_cache_destroy(dev->verbs_txreq_cache);
 140        dev->verbs_txreq_cache = NULL;
 141}
 142