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