1 /* $NetBSD: dmover_request.c,v 1.1 2002/08/02 00:30:39 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 2002 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 /*
39 * dmover_request.c: Request management functions for dmover-api.
40 */
41
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: dmover_request.c,v 1.1 2002/08/02 00:30:39 thorpej Exp $");
44
45 #include <sys/param.h>
46 #include <sys/lock.h>
47 #include <sys/pool.h>
48 #include <sys/systm.h>
49 #include <sys/malloc.h>
50
51 #include <dev/dmover/dmovervar.h>
52
53 struct pool dmover_request_pool;
54 struct pool_cache dmover_request_cache;
55
56 static int initialized;
57 static struct simplelock initialized_slock = SIMPLELOCK_INITIALIZER;
58
59 void
60 dmover_request_initialize(void)
61 {
62 int s;
63
64 s = splbio();
65 simple_lock(&initialized_slock);
66 if (__predict_true(initialized == 0)) {
67 pool_init(&dmover_request_pool, sizeof(struct dmover_request),
68 0, 0, 0, "dmreq", NULL);
69 pool_cache_init(&dmover_request_cache, &dmover_request_pool,
70 NULL, NULL, NULL);
71 initialized = 1;
72 }
73 simple_unlock(&initialized_slock);
74 splx(s);
75 }
76
77 /*
78 * dmover_request_alloc: [client interface function]
79 *
80 * Allocate a tranform request for the specified session.
81 */
82 struct dmover_request *
83 dmover_request_alloc(struct dmover_session *dses, dmover_buffer *inbuf)
84 {
85 struct dmover_request *dreq;
86 int s, inputs = dses->dses_ninputs;
87
88 if (__predict_false(initialized == 0)) {
89 int error;
90
91 s = splbio();
92 simple_lock(&initialized_slock);
93 error = (initialized == 0);
94 simple_unlock(&initialized_slock);
95 splx(s);
96
97 if (error)
98 return (NULL);
99 }
100
101 s = splbio();
102 dreq = pool_cache_get(&dmover_request_cache, PR_NOWAIT);
103 splx(s);
104 if (dreq == NULL)
105 return (NULL);
106
107 memset(dreq, 0, sizeof(*dreq));
108
109 if (inputs != 0) {
110 if (inbuf == NULL) {
111 inbuf = malloc(sizeof(dmover_buffer) * inputs,
112 M_DEVBUF, M_NOWAIT);
113 if (inbuf == NULL) {
114 s = splbio();
115 pool_cache_put(&dmover_request_cache, dreq);
116 splx(s);
117 return (NULL);
118 }
119 }
120 dreq->dreq_flags |= __DMOVER_REQ_INBUF_FREE;
121 dreq->dreq_inbuf = inbuf;
122 }
123
124 dreq->dreq_session = dses;
125
126 return (dreq);
127 }
128
129 /*
130 * dmover_request_free: [client interface function]
131 *
132 * Free a dmover request.
133 */
134 void
135 dmover_request_free(struct dmover_request *dreq)
136 {
137 int s;
138
139 if (dreq->dreq_flags & __DMOVER_REQ_INBUF_FREE)
140 free(dreq->dreq_inbuf, M_DEVBUF);
141
142 s = splbio();
143 pool_cache_put(&dmover_request_cache, dreq);
144 splx(s);
145 }
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