1 /* $NetBSD: dmover_request.c,v 1.8 2011/05/14 18:24:47 jakllsch 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 1.8 2011/05/14 18:24:47 jakllsch Exp $");
44
45 #include <sys/param.h>
46 #include <sys/pool.h>
47 #include <sys/systm.h>
48 #include <sys/malloc.h>
49
50 #include <dev/dmover/dmovervar.h>
51
52 pool_cache_t dmover_request_cache;
53
54 static bool initialized;
55
56 void
dmover_request_initialize(void)57 dmover_request_initialize(void)
58 {
59
60 KASSERT(initialized == false);
61
62 dmover_request_cache = pool_cache_init(sizeof(struct dmover_request),
63 0, 0, 0, "dmreq", NULL, IPL_BIO, NULL, NULL, NULL);
64
65 initialized = true;
66 }
67
68 /*
69 * dmover_request_alloc: [client interface function]
70 *
71 * Allocate a transform request for the specified session.
72 */
73 struct dmover_request *
dmover_request_alloc(struct dmover_session * dses,dmover_buffer * inbuf)74 dmover_request_alloc(struct dmover_session *dses, dmover_buffer *inbuf)
75 {
76 struct dmover_request *dreq;
77 int inputs = dses->dses_ninputs;
78
79 if (__predict_false(initialized == false))
80 return (NULL);
81
82 dreq = pool_cache_get(dmover_request_cache, PR_NOWAIT);
83 if (dreq == NULL)
84 return (NULL);
85
86 memset(dreq, 0, sizeof(*dreq));
87
88 if (inputs != 0) {
89 if (inbuf == NULL) {
90 inbuf = malloc(sizeof(dmover_buffer) * inputs,
91 M_DEVBUF, M_NOWAIT);
92 if (inbuf == NULL) {
93 pool_cache_put(dmover_request_cache, dreq);
94 return (NULL);
95 }
96 }
97 dreq->dreq_flags |= __DMOVER_REQ_INBUF_FREE;
98 dreq->dreq_inbuf = inbuf;
99 }
100
101 dreq->dreq_session = dses;
102
103 return (dreq);
104 }
105
106 /*
107 * dmover_request_free: [client interface function]
108 *
109 * Free a dmover request.
110 */
111 void
dmover_request_free(struct dmover_request * dreq)112 dmover_request_free(struct dmover_request *dreq)
113 {
114
115 KASSERT(initialized == true);
116
117 if (dreq->dreq_flags & __DMOVER_REQ_INBUF_FREE)
118 free(dreq->dreq_inbuf, M_DEVBUF);
119
120 pool_cache_put(dmover_request_cache, dreq);
121 }
122