[linux-2.6-block.git] / drivers / infiniband / hw / hfi1 / verbs_txreq.c

/*
 * Copyright(c) 2016 Intel Corporation.
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * BSD LICENSE
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  - Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  - Neither the name of Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include "hfi.h"
#include "verbs_txreq.h"
#include "qp.h"
#include "trace.h"

#define TXREQ_LEN 24

void hfi1_put_txreq(struct verbs_txreq *tx)
{
	struct hfi1_ibdev *dev;
	struct rvt_qp *qp;
	unsigned long flags;
	unsigned int seq;
	struct hfi1_qp_priv *priv;

	qp = tx->qp;
	dev = to_idev(qp->ibqp.device);

	if (tx->mr)
		rvt_put_mr(tx->mr);

	sdma_txclean(dd_from_dev(dev), &tx->txreq);

	/* Free verbs_txreq and return to slab cache */
	kmem_cache_free(dev->verbs_txreq_cache, tx);

	do {
		seq = read_seqbegin(&dev->iowait_lock);
		if (!list_empty(&dev->txwait)) {
			struct iowait *wait;

			write_seqlock_irqsave(&dev->iowait_lock, flags);
			wait = list_first_entry(&dev->txwait, struct iowait,
						list);
			qp = iowait_to_qp(wait);
			priv = qp->priv;
			list_del_init(&priv->s_iowait.list);
			/* refcount held until actual wake up */
			write_sequnlock_irqrestore(&dev->iowait_lock, flags);
			hfi1_qp_wakeup(qp, RVT_S_WAIT_TX);
			break;
		}
	} while (read_seqretry(&dev->iowait_lock, seq));
}

struct verbs_txreq *__get_txreq(struct hfi1_ibdev *dev,
				struct rvt_qp *qp)
	__must_hold(&qp->s_lock)
{
	struct verbs_txreq *tx = ERR_PTR(-EBUSY);

	write_seqlock(&dev->iowait_lock);
	if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
		struct hfi1_qp_priv *priv;

		tx = kmem_cache_alloc(dev->verbs_txreq_cache, GFP_ATOMIC);
		if (tx)
			goto out;
		priv = qp->priv;
		if (list_empty(&priv->s_iowait.list)) {
			dev->n_txwait++;
			qp->s_flags |= RVT_S_WAIT_TX;
			list_add_tail(&priv->s_iowait.list, &dev->txwait);
			trace_hfi1_qpsleep(qp, RVT_S_WAIT_TX);
			atomic_inc(&qp->refcount);
		}
		qp->s_flags &= ~RVT_S_BUSY;
	}
out:
	write_sequnlock(&dev->iowait_lock);
	return tx;
}

static void verbs_txreq_kmem_cache_ctor(void *obj)
{
	struct verbs_txreq *tx = (struct verbs_txreq *)obj;

	memset(tx, 0, sizeof(*tx));
}

int verbs_txreq_init(struct hfi1_ibdev *dev)
{
	char buf[TXREQ_LEN];
	struct hfi1_devdata *dd = dd_from_dev(dev);

	snprintf(buf, sizeof(buf), "hfi1_%u_vtxreq_cache", dd->unit);
	dev->verbs_txreq_cache = kmem_cache_create(buf,
						   sizeof(struct verbs_txreq),
						   0, SLAB_HWCACHE_ALIGN,
						   verbs_txreq_kmem_cache_ctor);
	if (!dev->verbs_txreq_cache)
		return -ENOMEM;
	return 0;
}

void verbs_txreq_exit(struct hfi1_ibdev *dev)
{
	kmem_cache_destroy(dev->verbs_txreq_cache);
	dev->verbs_txreq_cache = NULL;
}
Commit	Line	Data
45842abb MM	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)
2aee309d	95	__must_hold(&qp->s_lock)
45842abb MM	96	{
45842abb MM	97	struct verbs_txreq *tx = ERR_PTR(-EBUSY);
45842abb	98
45842abb MM	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);
45842abb MM	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	}