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
38 void
init_completion(struct completion * c)39 init_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
46 void
free_completion(struct completion * c)47 free_completion(struct completion *c)
48 {
49 mtx_destroy(&c->lock);
50 }
51
52 void
complete(struct completion * c)53 complete(struct completion *c)
54 {
55 mtx_lock(&c->lock);
56 c->done++;
57 mtx_unlock(&c->lock);
58 wakeup(c);
59 }
60
61 void
wait_for_completion(struct completion * c)62 wait_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 */
74 int
wait_for_completion_timeout(struct completion * c,int timeout)75 wait_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