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 (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 25 /* 26 * FMD Topology Handling 27 * 28 * Fault manager scheme and module plug-ins may need access to the latest 29 * libtopo snapshot. Upon fmd initialization, a snapshot is taken and 30 * made available via fmd_fmri_topology() and fmd_hdl_topology(). Each 31 * of these routines returns a libtopo snapshot handle back to the caller. 32 * New snapshots are taken if and when a DR event causes the DR generation 33 * number to increase. The current snapshot is retained to assure consistency 34 * for modules still using older snapshots and the latest snapshot handle is 35 * returned to the caller. 36 */ 37 38 #include <fmd_alloc.h> 39 #include <fmd_error.h> 40 #include <fmd_subr.h> 41 #include <fmd_topo.h> 42 #include <fmd.h> 43 44 #include <string.h> 45 #include <unistd.h> 46 #include <sys/types.h> 47 #include <fm/fmd_fmri.h> 48 #include <fm/libtopo.h> 49 50 static void 51 fmd_topo_rele_locked(fmd_topo_t *ftp) 52 { 53 ASSERT(MUTEX_HELD(&fmd.d_topo_lock)); 54 55 if (--ftp->ft_refcount == 0) { 56 fmd_list_delete(&fmd.d_topo_list, ftp); 57 topo_close(ftp->ft_hdl); 58 fmd_free(ftp, sizeof (fmd_topo_t)); 59 } 60 } 61 62 void 63 fmd_topo_update(void) 64 { 65 int err; 66 topo_hdl_t *tp; 67 fmd_topo_t *ftp, *prev; 68 char *id; 69 const char *name; 70 71 (void) pthread_mutex_lock(&fmd.d_topo_lock); 72 73 fmd.d_stats->ds_topo_drgen.fmds_value.ui64 = fmd_fmri_get_drgen(); 74 75 name = fmd.d_rootdir != NULL && 76 *fmd.d_rootdir != '\0' ? fmd.d_rootdir : NULL; 77 78 /* 79 * Update the topology snapshot. 80 */ 81 if ((tp = topo_open(TOPO_VERSION, name, &err)) == NULL) 82 fmd_panic("failed to open topology library: %s", 83 topo_strerror(err)); 84 85 ftp = fmd_alloc(sizeof (fmd_topo_t), FMD_SLEEP); 86 ftp->ft_hdl = tp; 87 ftp->ft_time_begin = fmd_time_gethrtime(); 88 89 if ((id = topo_snap_hold(tp, NULL, &err)) == NULL) 90 fmd_panic("failed to get topology snapshot: %s", 91 topo_strerror(err)); 92 93 topo_hdl_strfree(tp, id); 94 95 ftp->ft_time_end = fmd_time_gethrtime(); 96 fmd.d_stats->ds_topo_gen.fmds_value.ui64++; 97 98 /* 99 * We always keep a reference count on the last topo snapshot taken. 100 * Release the previous snapshot (if present), and set the current 101 * reference count to 1. 102 */ 103 if ((prev = fmd_list_next(&fmd.d_topo_list)) != NULL) 104 fmd_topo_rele_locked(prev); 105 ftp->ft_refcount = 1; 106 fmd_list_prepend(&fmd.d_topo_list, ftp); 107 108 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 109 } 110 111 fmd_topo_t * 112 fmd_topo_hold(void) 113 { 114 fmd_topo_t *ftp; 115 116 (void) pthread_mutex_lock(&fmd.d_topo_lock); 117 ftp = fmd_list_next(&fmd.d_topo_list); 118 ftp->ft_refcount++; 119 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 120 121 return (ftp); 122 } 123 124 void 125 fmd_topo_addref(fmd_topo_t *ftp) 126 { 127 (void) pthread_mutex_lock(&fmd.d_topo_lock); 128 ftp->ft_refcount++; 129 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 130 } 131 132 void 133 fmd_topo_rele(fmd_topo_t *ftp) 134 { 135 (void) pthread_mutex_lock(&fmd.d_topo_lock); 136 137 fmd_topo_rele_locked(ftp); 138 139 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 140 } 141 142 void 143 fmd_topo_rele_hdl(topo_hdl_t *thp) 144 { 145 fmd_topo_t *ftp; 146 147 (void) pthread_mutex_lock(&fmd.d_topo_lock); 148 for (ftp = fmd_list_next(&fmd.d_topo_list); ftp != NULL; 149 ftp = fmd_list_next(ftp)) { 150 if (ftp->ft_hdl == thp) 151 break; 152 } 153 ASSERT(ftp != NULL); 154 155 fmd_topo_rele_locked(ftp); 156 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 157 } 158 159 void 160 fmd_topo_init(void) 161 { 162 fmd_topo_update(); 163 } 164 165 void 166 fmd_topo_fini(void) 167 { 168 fmd_topo_t *ftp; 169 170 (void) pthread_mutex_lock(&fmd.d_topo_lock); 171 while ((ftp = fmd_list_next(&fmd.d_topo_list)) != NULL) { 172 fmd_list_delete(&fmd.d_topo_list, ftp); 173 topo_close(ftp->ft_hdl); 174 fmd_free(ftp, sizeof (fmd_topo_t)); 175 } 176 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 177 } 178