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 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 * 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 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