FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/ccbque.h
1 /* $NetBSD$ */
2 /*
3 * [NetBSD for NEC PC98 series]
4 * Copyright (c) 1994, 1995, 1996 NetBSD/pc98 porting staff.
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 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
27 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30 /*
31 * Common command control queue funcs.
32 * Written by N. Honda.
33 */
34
35 #ifndef _CCBQUE_H_
36 #define _CCBQUE_H_
37
38 #define CCB_MWANTED 0x01
39 #define CCB_WOK(fl) (((fl) == 0) ? M_WAITOK : M_NOWAIT)
40
41 /* (I) structure and prototype */
42 #define GENERIC_CCB_ASSERT(DEV, CCBTYPE) \
43 TAILQ_HEAD(CCBTYPE##tab, CCBTYPE); \
44 struct CCBTYPE##que { \
45 struct CCBTYPE##tab CCBTYPE##tab; \
46 int count; \
47 int maxccb; \
48 u_int flags; \
49 }; \
50 \
51 void DEV##_init_ccbque __P((int)); \
52 struct CCBTYPE *DEV##_get_ccb __P((int)); \
53 void DEV##_free_ccb __P((register struct CCBTYPE *));
54
55 /* (II) static allocated memory */
56 #define GENERIC_CCB_STATIC_ALLOC(DEV, CCBTYPE) \
57 static struct CCBTYPE##que CCBTYPE##que;
58
59 /* (III) functions */
60 #define GENERIC_CCB(DEV, CCBTYPE, CHAIN) \
61 \
62 void \
63 DEV##_init_ccbque(count) \
64 int count; \
65 { \
66 if (CCBTYPE##que.maxccb == 0) \
67 TAILQ_INIT(&CCBTYPE##que.CCBTYPE##tab); \
68 CCBTYPE##que.maxccb += count; \
69 } \
70 \
71 struct CCBTYPE * \
72 DEV##_get_ccb(flags) \
73 int flags; \
74 { \
75 register struct CCBTYPE *cb; \
76 int s = splbio(); \
77 \
78 again: \
79 if (CCBTYPE##que.count < CCBTYPE##que.maxccb) \
80 { \
81 CCBTYPE##que.count ++; \
82 cb = CCBTYPE##que.CCBTYPE##tab.tqh_first; \
83 if (cb != NULL) \
84 { \
85 TAILQ_REMOVE(&CCBTYPE##que.CCBTYPE##tab, cb, CHAIN);\
86 goto out; \
87 } \
88 else \
89 { \
90 cb = malloc(sizeof(*cb), M_DEVBUF, CCB_WOK(flags));\
91 if (cb != NULL) \
92 { \
93 bzero(cb, sizeof(*cb)); \
94 goto out; \
95 } \
96 } \
97 CCBTYPE##que.count --; \
98 } \
99 \
100 if (flags == 0) \
101 { \
102 CCBTYPE##que.flags |= CCB_MWANTED; \
103 tsleep((caddr_t) &CCBTYPE##que.count, PRIBIO, "ccbwait", 0);\
104 goto again; \
105 } \
106 cb = NULL; \
107 \
108 out: \
109 splx(s); \
110 return cb; \
111 } \
112 \
113 void \
114 DEV##_free_ccb(cb) \
115 register struct CCBTYPE *cb; \
116 { \
117 int s = splbio(); \
118 \
119 TAILQ_INSERT_TAIL(&CCBTYPE##que.CCBTYPE##tab, cb, CHAIN); \
120 CCBTYPE##que.count --; \
121 \
122 if (CCBTYPE##que.flags & CCB_MWANTED) \
123 { \
124 CCBTYPE##que.flags &= ~CCB_MWANTED; \
125 wakeup ((caddr_t) &CCBTYPE##que.count); \
126 } \
127 splx(s); \
128 }
129 #endif /* !_CCBQUE_H_ */
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