Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/sys/ccbque.h
Version:
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1 /* 2 * [NetBSD for NEC PC98 series] 3 * Copyright (c) 1994, 1995, 1996 NetBSD/pc98 porting staff. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 26 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $NetBSD$ 30 * $FreeBSD: src/sys/i386/isa/ccbque.h,v 1.3.6.2 2000/10/21 07:44:24 nyan Exp $ 31 * $DragonFly: src/sys/sys/ccbque.h,v 1.11 2008/01/05 14:02:41 swildner Exp $ 32 */ 33 /* 34 * Common command control queue funcs. 35 * Written by N. Honda. 36 */ 37 38 #ifndef _SYS_CCBQUE_H_ 39 #define _SYS_CCBQUE_H_ 40 41 #define CCB_MWANTED 0x01 42 43 /* (I) structure and prototype */ 44 #define GENERIC_CCB_ASSERT(DEV, CCBTYPE) \ 45 TAILQ_HEAD(CCBTYPE##tab, CCBTYPE); \ 46 struct CCBTYPE##que { \ 47 struct CCBTYPE##tab CCBTYPE##tab; \ 48 int count; \ 49 int maxccb; \ 50 u_int flags; \ 51 }; \ 52 \ 53 void DEV##_init_ccbque (int); \ 54 struct CCBTYPE *DEV##_get_ccb (void); \ 55 void DEV##_free_ccb (struct CCBTYPE *); 56 57 /* (II) static allocated memory */ 58 #define GENERIC_CCB_STATIC_ALLOC(DEV, CCBTYPE) \ 59 static struct CCBTYPE##que CCBTYPE##que; 60 61 /* (III) functions */ 62 #define GENERIC_CCB(DEV, CCBTYPE, CHAIN) \ 63 \ 64 void \ 65 DEV##_init_ccbque(int count) \ 66 { \ 67 if (CCBTYPE##que.maxccb == 0) \ 68 TAILQ_INIT(&CCBTYPE##que.CCBTYPE##tab); \ 69 CCBTYPE##que.maxccb += count; \ 70 } \ 71 \ 72 struct CCBTYPE * \ 73 DEV##_get_ccb(void) \ 74 { \ 75 struct CCBTYPE *cb; \ 76 \ 77 crit_enter(); \ 78 \ 79 if (CCBTYPE##que.count < CCBTYPE##que.maxccb) \ 80 { \ 81 CCBTYPE##que.count ++; \ 82 cb = TAILQ_FIRST(&CCBTYPE##que.CCBTYPE##tab); \ 83 if (cb != NULL) \ 84 { \ 85 TAILQ_REMOVE(&CCBTYPE##que.CCBTYPE##tab, cb, CHAIN);\ 86 goto out; \ 87 } \ 88 else \ 89 { \ 90 cb = kmalloc(sizeof(*cb), M_DEVBUF, M_INTWAIT|M_ZERO);\ 91 if (cb != NULL) \ 92 goto out; \ 93 } \ 94 CCBTYPE##que.count --; \ 95 } \ 96 \ 97 cb = NULL; \ 98 \ 99 out: \ 100 crit_exit(); \ 101 return cb; \ 102 } \ 103 \ 104 void \ 105 DEV##_free_ccb(struct CCBTYPE *cb) \ 106 { \ 107 crit_enter(); \ 108 \ 109 TAILQ_INSERT_TAIL(&CCBTYPE##que.CCBTYPE##tab, cb, CHAIN); \ 110 CCBTYPE##que.count --; \ 111 \ 112 if (CCBTYPE##que.flags & CCB_MWANTED) \ 113 { \ 114 CCBTYPE##que.flags &= ~CCB_MWANTED; \ 115 wakeup ((caddr_t) &CCBTYPE##que.count); \ 116 } \ 117 crit_exit(); \ 118 } 119 #endif /* !_SYS_CCBQUE_H_ */
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