1 /* $NetBSD: dmover_session.c,v 1.6 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_session.c: Session management functions for dmover-api. 40 */ 41 42 #include <sys/cdefs.h> 43 __KERNEL_RCSID(0, "$NetBSD: dmover_session.c,v 1.6 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 struct pool dmover_session_pool; 53 54 static bool initialized; 55 56 void 57 dmover_session_initialize(void) 58 { 59 60 KASSERT(initialized == false); 61 62 pool_init(&dmover_session_pool, sizeof(struct dmover_session), 63 0, 0, 0, "dmses", &pool_allocator_nointr, IPL_NONE); 64 initialized = true; 65 } 66 67 /* 68 * dmover_session_create: [client interface function] 69 * 70 * Create a dmover session. 71 */ 72 int 73 dmover_session_create(const char *type, struct dmover_session **dsesp) 74 { 75 struct dmover_session *dses; 76 int error; 77 78 if (__predict_false(initialized == false)) { 79 error = initialized ? false : ENXIO; 80 81 if (error) 82 return (error); 83 } 84 85 dses = pool_get(&dmover_session_pool, PR_NOWAIT); 86 if (__predict_false(dses == NULL)) 87 return (ENOMEM); 88 89 /* Allocate a back-end to the session. */ 90 error = dmover_backend_alloc(dses, type); 91 if (__predict_false(error)) { 92 pool_put(&dmover_session_pool, dses); 93 return (error); 94 } 95 96 TAILQ_INIT(&dses->__dses_pendreqs); 97 dses->__dses_npendreqs = 0; 98 99 *dsesp = dses; 100 return (0); 101 } 102 103 /* 104 * dmover_session_destroy: [client interface function] 105 * 106 * Tear down a dmover session. 107 */ 108 void 109 dmover_session_destroy(struct dmover_session *dses) 110 { 111 112 KASSERT(initialized == true); 113 114 /* XXX */ 115 if (dses->__dses_npendreqs) 116 panic("dmover_session_destroy"); 117 118 dmover_backend_release(dses); 119 pool_put(&dmover_session_pool, dses); 120 } 121