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(boolean_t need_force) 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 (need_force) { 91 if ((id = topo_snap_hold(tp, NULL, &err)) == NULL) 92 fmd_panic("failed to get topology snapshot: %s", 93 topo_strerror(err)); 94 } else { 95 if ((id = topo_snap_hold_no_forceload(tp, NULL, &err)) == NULL) 96 fmd_panic("failed to get topology snapshot: %s", 97 topo_strerror(err)); 98 } 99 100 topo_hdl_strfree(tp, id); 101 102 ftp->ft_time_end = fmd_time_gethrtime(); 103 fmd.d_stats->ds_topo_gen.fmds_value.ui64++; 104 105 /* 106 * We always keep a reference count on the last topo snapshot taken. 107 * Release the previous snapshot (if present), and set the current 108 * reference count to 1. 109 */ 110 if ((prev = fmd_list_next(&fmd.d_topo_list)) != NULL) 111 fmd_topo_rele_locked(prev); 112 ftp->ft_refcount = 1; 113 fmd_list_prepend(&fmd.d_topo_list, ftp); 114 115 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 116 } 117 118 fmd_topo_t * 119 fmd_topo_hold(void) 120 { 121 fmd_topo_t *ftp; 122 123 (void) pthread_mutex_lock(&fmd.d_topo_lock); 124 ftp = fmd_list_next(&fmd.d_topo_list); 125 ftp->ft_refcount++; 126 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 127 128 return (ftp); 129 } 130 131 void 132 fmd_topo_addref(fmd_topo_t *ftp) 133 { 134 (void) pthread_mutex_lock(&fmd.d_topo_lock); 135 ftp->ft_refcount++; 136 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 137 } 138 139 void 140 fmd_topo_rele(fmd_topo_t *ftp) 141 { 142 (void) pthread_mutex_lock(&fmd.d_topo_lock); 143 144 fmd_topo_rele_locked(ftp); 145 146 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 147 } 148 149 void 150 fmd_topo_rele_hdl(topo_hdl_t *thp) 151 { 152 fmd_topo_t *ftp; 153 154 (void) pthread_mutex_lock(&fmd.d_topo_lock); 155 for (ftp = fmd_list_next(&fmd.d_topo_list); ftp != NULL; 156 ftp = fmd_list_next(ftp)) { 157 if (ftp->ft_hdl == thp) 158 break; 159 } 160 ASSERT(ftp != NULL); 161 162 fmd_topo_rele_locked(ftp); 163 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 164 } 165 166 void 167 fmd_topo_init(void) 168 { 169 fmd_topo_update(B_TRUE); 170 } 171 172 void 173 fmd_topo_fini(void) 174 { 175 fmd_topo_t *ftp; 176 177 (void) pthread_mutex_lock(&fmd.d_topo_lock); 178 while ((ftp = fmd_list_next(&fmd.d_topo_list)) != NULL) { 179 fmd_list_delete(&fmd.d_topo_list, ftp); 180 topo_close(ftp->ft_hdl); 181 fmd_free(ftp, sizeof (fmd_topo_t)); 182 } 183 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 184 } 185