1 /* 2 * Copyright(c) 2016 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 55 void 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->iowait_lock); 76 if (!list_empty(&dev->txwait)) { 77 struct iowait *wait; 78 79 write_seqlock_irqsave(&dev->iowait_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->iowait_lock, flags); 87 hfi1_qp_wakeup(qp, RVT_S_WAIT_TX); 88 break; 89 } 90 } while (read_seqretry(&dev->iowait_lock, seq)); 91 } 92 93 struct 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 = ERR_PTR(-EBUSY); 98 99 write_seqlock(&dev->iowait_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, GFP_ATOMIC); 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 trace_hfi1_qpsleep(qp, RVT_S_WAIT_TX); 112 atomic_inc(&qp->refcount); 113 } 114 qp->s_flags &= ~RVT_S_BUSY; 115 } 116 out: 117 write_sequnlock(&dev->iowait_lock); 118 return tx; 119 } 120 121 static void verbs_txreq_kmem_cache_ctor(void *obj) 122 { 123 struct verbs_txreq *tx = (struct verbs_txreq *)obj; 124 125 memset(tx, 0, sizeof(*tx)); 126 } 127 128 int verbs_txreq_init(struct hfi1_ibdev *dev) 129 { 130 char buf[TXREQ_LEN]; 131 struct hfi1_devdata *dd = dd_from_dev(dev); 132 133 snprintf(buf, sizeof(buf), "hfi1_%u_vtxreq_cache", dd->unit); 134 dev->verbs_txreq_cache = kmem_cache_create(buf, 135 sizeof(struct verbs_txreq), 136 0, SLAB_HWCACHE_ALIGN, 137 verbs_txreq_kmem_cache_ctor); 138 if (!dev->verbs_txreq_cache) 139 return -ENOMEM; 140 return 0; 141 } 142 143 void verbs_txreq_exit(struct hfi1_ibdev *dev) 144 { 145 kmem_cache_destroy(dev->verbs_txreq_cache); 146 dev->verbs_txreq_cache = NULL; 147 } 148