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 } 146