1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause 2 /* 3 * Copyright(c) 2016 - 2018 Intel Corporation. 4 */ 5 6 #include "hfi.h" 7 #include "verbs_txreq.h" 8 #include "qp.h" 9 #include "trace.h" 10 11 #define TXREQ_LEN 24 12 13 void hfi1_put_txreq(struct verbs_txreq *tx) 14 { 15 struct hfi1_ibdev *dev; 16 struct rvt_qp *qp; 17 unsigned long flags; 18 unsigned int seq; 19 struct hfi1_qp_priv *priv; 20 21 qp = tx->qp; 22 dev = to_idev(qp->ibqp.device); 23 24 if (tx->mr) 25 rvt_put_mr(tx->mr); 26 27 sdma_txclean(dd_from_dev(dev), &tx->txreq); 28 29 /* Free verbs_txreq and return to slab cache */ 30 kmem_cache_free(dev->verbs_txreq_cache, tx); 31 32 do { 33 seq = read_seqbegin(&dev->txwait_lock); 34 if (!list_empty(&dev->txwait)) { 35 struct iowait *wait; 36 37 write_seqlock_irqsave(&dev->txwait_lock, flags); 38 wait = list_first_entry(&dev->txwait, struct iowait, 39 list); 40 qp = iowait_to_qp(wait); 41 priv = qp->priv; 42 list_del_init(&priv->s_iowait.list); 43 /* refcount held until actual wake up */ 44 write_sequnlock_irqrestore(&dev->txwait_lock, flags); 45 hfi1_qp_wakeup(qp, RVT_S_WAIT_TX); 46 break; 47 } 48 } while (read_seqretry(&dev->txwait_lock, seq)); 49 } 50 51 struct verbs_txreq *__get_txreq(struct hfi1_ibdev *dev, 52 struct rvt_qp *qp) 53 __must_hold(&qp->s_lock) 54 { 55 struct verbs_txreq *tx = NULL; 56 57 write_seqlock(&dev->txwait_lock); 58 if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) { 59 struct hfi1_qp_priv *priv; 60 61 tx = kmem_cache_alloc(dev->verbs_txreq_cache, VERBS_TXREQ_GFP); 62 if (tx) 63 goto out; 64 priv = qp->priv; 65 if (list_empty(&priv->s_iowait.list)) { 66 dev->n_txwait++; 67 qp->s_flags |= RVT_S_WAIT_TX; 68 list_add_tail(&priv->s_iowait.list, &dev->txwait); 69 priv->s_iowait.lock = &dev->txwait_lock; 70 trace_hfi1_qpsleep(qp, RVT_S_WAIT_TX); 71 rvt_get_qp(qp); 72 } 73 qp->s_flags &= ~RVT_S_BUSY; 74 } 75 out: 76 write_sequnlock(&dev->txwait_lock); 77 return tx; 78 } 79 80 int verbs_txreq_init(struct hfi1_ibdev *dev) 81 { 82 char buf[TXREQ_LEN]; 83 struct hfi1_devdata *dd = dd_from_dev(dev); 84 85 snprintf(buf, sizeof(buf), "hfi1_%u_vtxreq_cache", dd->unit); 86 dev->verbs_txreq_cache = kmem_cache_create(buf, 87 sizeof(struct verbs_txreq), 88 0, SLAB_HWCACHE_ALIGN, 89 NULL); 90 if (!dev->verbs_txreq_cache) 91 return -ENOMEM; 92 return 0; 93 } 94 95 void verbs_txreq_exit(struct hfi1_ibdev *dev) 96 { 97 kmem_cache_destroy(dev->verbs_txreq_cache); 98 dev->verbs_txreq_cache = NULL; 99 } 100