1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* 27 * FMD Topology Handling 28 * 29 * Fault manager scheme and module plug-ins may need access to the latest 30 * libtopo snapshot. Upon fmd initialization, a snapshot is taken and 31 * made available via fmd_fmri_topology() and fmd_hdl_topology(). Each 32 * of these routines returns a libtopo snapshot handle back to the caller. 33 * New snapshots are taken if and when a DR event causes the DR generation 34 * number to increase. The current snapshot is retained to assure consistency 35 * for modules still using older snapshots and the latest snapshot handle is 36 * returned to the caller. 37 */ 38 39 #include <fmd_alloc.h> 40 #include <fmd_error.h> 41 #include <fmd_subr.h> 42 #include <fmd_topo.h> 43 #include <fmd.h> 44 45 #include <string.h> 46 #include <unistd.h> 47 #include <sys/types.h> 48 #include <fm/fmd_fmri.h> 49 #include <fm/libtopo.h> 50 51 static void 52 fmd_topo_rele_locked(fmd_topo_t *ftp) 53 { 54 ASSERT(MUTEX_HELD(&fmd.d_topo_lock)); 55 56 if (--ftp->ft_refcount == 0) { 57 fmd_list_delete(&fmd.d_topo_list, ftp); 58 topo_close(ftp->ft_hdl); 59 fmd_free(ftp, sizeof (fmd_topo_t)); 60 } 61 } 62 63 void 64 fmd_topo_update(void) 65 { 66 int err; 67 topo_hdl_t *tp; 68 fmd_topo_t *ftp, *prev; 69 char *id; 70 const char *name; 71 72 (void) pthread_mutex_lock(&fmd.d_topo_lock); 73 74 fmd.d_stats->ds_topo_drgen.fmds_value.ui64 = fmd_fmri_get_drgen(); 75 76 name = fmd.d_rootdir != NULL && 77 *fmd.d_rootdir != '\0' ? fmd.d_rootdir : NULL; 78 79 /* 80 * Update the topology snapshot. 81 */ 82 if ((tp = topo_open(TOPO_VERSION, name, &err)) == NULL) 83 fmd_panic("failed to open topology library: %s", 84 topo_strerror(err)); 85 86 ftp = fmd_alloc(sizeof (fmd_topo_t), FMD_SLEEP); 87 ftp->ft_hdl = tp; 88 ftp->ft_time_begin = fmd_time_gethrtime(); 89 90 if ((id = topo_snap_hold(tp, NULL, &err)) == NULL) 91 fmd_panic("failed to get topology snapshot: %s", 92 topo_strerror(err)); 93 94 topo_hdl_strfree(tp, id); 95 96 ftp->ft_time_end = fmd_time_gethrtime(); 97 fmd.d_stats->ds_topo_gen.fmds_value.ui64++; 98 99 /* 100 * We always keep a reference count on the last topo snapshot taken. 101 * Release the previous snapshot (if present), and set the current 102 * reference count to 1. 103 */ 104 if ((prev = fmd_list_next(&fmd.d_topo_list)) != NULL) 105 fmd_topo_rele_locked(prev); 106 ftp->ft_refcount = 1; 107 fmd_list_prepend(&fmd.d_topo_list, ftp); 108 109 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 110 } 111 112 fmd_topo_t * 113 fmd_topo_hold(void) 114 { 115 fmd_topo_t *ftp; 116 117 (void) pthread_mutex_lock(&fmd.d_topo_lock); 118 ftp = fmd_list_next(&fmd.d_topo_list); 119 ftp->ft_refcount++; 120 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 121 122 return (ftp); 123 } 124 125 void 126 fmd_topo_addref(fmd_topo_t *ftp) 127 { 128 (void) pthread_mutex_lock(&fmd.d_topo_lock); 129 ftp->ft_refcount++; 130 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 131 } 132 133 void 134 fmd_topo_rele(fmd_topo_t *ftp) 135 { 136 (void) pthread_mutex_lock(&fmd.d_topo_lock); 137 138 fmd_topo_rele_locked(ftp); 139 140 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 141 } 142 143 void 144 fmd_topo_rele_hdl(topo_hdl_t *thp) 145 { 146 fmd_topo_t *ftp; 147 148 (void) pthread_mutex_lock(&fmd.d_topo_lock); 149 for (ftp = fmd_list_next(&fmd.d_topo_list); ftp != NULL; 150 ftp = fmd_list_next(ftp)) { 151 if (ftp->ft_hdl == thp) 152 break; 153 } 154 ASSERT(ftp != NULL); 155 156 fmd_topo_rele_locked(ftp); 157 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 158 } 159 160 void 161 fmd_topo_init(void) 162 { 163 fmd_topo_update(); 164 } 165 166 void 167 fmd_topo_fini(void) 168 { 169 fmd_topo_t *ftp; 170 171 (void) pthread_mutex_lock(&fmd.d_topo_lock); 172 while ((ftp = fmd_list_next(&fmd.d_topo_list)) != NULL) { 173 fmd_list_delete(&fmd.d_topo_list, ftp); 174 topo_close(ftp->ft_hdl); 175 fmd_free(ftp, sizeof (fmd_topo_t)); 176 } 177 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 178 } 179