1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2021 Microsoft Corp.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <sys/types.h>
32#include <sys/mutex.h>
33#include <sys/systm.h>
34
35#include "gdma_util.h"
36
37
38void
39init_completion(struct completion *c)
40{
41	memset(c, 0, sizeof(*c));
42	mtx_init(&c->lock, "gdma_completion", NULL, MTX_DEF);
43	c->done = 0;
44}
45
46void
47free_completion(struct completion *c)
48{
49	mtx_destroy(&c->lock);
50}
51
52void
53complete(struct completion *c)
54{
55	mtx_lock(&c->lock);
56	c->done++;
57	mtx_unlock(&c->lock);
58	wakeup(c);
59}
60
61void
62wait_for_completion(struct completion *c)
63{
64	mtx_lock(&c->lock);
65	while (c->done == 0)
66		mtx_sleep(c, &c->lock, 0, "gdma_wfc", 0);
67	c->done--;
68	mtx_unlock(&c->lock);
69}
70
71/*
72 * Return: 0 if completed, a non-zero value if timed out.
73 */
74int
75wait_for_completion_timeout(struct completion *c, int timeout)
76{
77	int ret;
78
79	mtx_lock(&c->lock);
80
81	if (c->done == 0)
82		mtx_sleep(c, &c->lock, 0, "gdma_wfc", timeout);
83
84	if (c->done > 0) {
85		c->done--;
86		ret = 0;
87	} else {
88		ret = 1;
89	}
90
91	mtx_unlock(&c->lock);
92
93	return (ret);
94}
95