1 /* $NetBSD: dmover_request.c,v 1.6 2007/11/12 15:50:21 he 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 1.6 2007/11/12 15:50:21 he 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 pool_cache_t dmover_request_cache; 54 55 static int initialized; 56 static struct simplelock initialized_slock = SIMPLELOCK_INITIALIZER; 57 58 void 59 dmover_request_initialize(void) 60 { 61 pool_cache_t pc; 62 int s; 63 64 if (initialized == 0) { 65 pc = pool_cache_init(sizeof(struct dmover_request), 0, 0, 0, 66 "dmreq", NULL, IPL_BIO, NULL, NULL, NULL); 67 } else { 68 pc = NULL; 69 } 70 71 s = splbio(); 72 simple_lock(&initialized_slock); 73 if (__predict_true(initialized == 0)) { 74 dmover_request_cache = pc; 75 pc = NULL; 76 initialized = 1; 77 } 78 simple_unlock(&initialized_slock); 79 splx(s); 80 81 if (pc != NULL) 82 pool_cache_destroy(pc); 83 } 84 85 /* 86 * dmover_request_alloc: [client interface function] 87 * 88 * Allocate a tranform request for the specified session. 89 */ 90 struct dmover_request * 91 dmover_request_alloc(struct dmover_session *dses, dmover_buffer *inbuf) 92 { 93 struct dmover_request *dreq; 94 int inputs = dses->dses_ninputs; 95 96 if (__predict_false(initialized == 0)) 97 return (NULL); 98 99 dreq = pool_cache_get(dmover_request_cache, PR_NOWAIT); 100 if (dreq == NULL) 101 return (NULL); 102 103 memset(dreq, 0, sizeof(*dreq)); 104 105 if (inputs != 0) { 106 if (inbuf == NULL) { 107 inbuf = malloc(sizeof(dmover_buffer) * inputs, 108 M_DEVBUF, M_NOWAIT); 109 if (inbuf == NULL) { 110 pool_cache_put(dmover_request_cache, dreq); 111 return (NULL); 112 } 113 } 114 dreq->dreq_flags |= __DMOVER_REQ_INBUF_FREE; 115 dreq->dreq_inbuf = inbuf; 116 } 117 118 dreq->dreq_session = dses; 119 120 return (dreq); 121 } 122 123 /* 124 * dmover_request_free: [client interface function] 125 * 126 * Free a dmover request. 127 */ 128 void 129 dmover_request_free(struct dmover_request *dreq) 130 { 131 132 if (dreq->dreq_flags & __DMOVER_REQ_INBUF_FREE) 133 free(dreq->dreq_inbuf, M_DEVBUF); 134 135 pool_cache_put(dmover_request_cache, dreq); 136 } 137