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 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* 29 * FMD Topology Handling 30 * 31 * Fault manager scheme and module plug-ins may need access to the latest 32 * libtopo snapshot. Upon fmd initialization, a snapshot is taken and 33 * made available via fmd_fmri_topology() and fmd_hdl_topology(). Each 34 * of these routines returns a libtopo snapshot handle back to the caller. 35 * New snapshots are taken if and when a DR event causes the DR generation 36 * number to increase. The current snapshot is retained to assure consistency 37 * for modules still using older snapshots and the latest snapshot handle is 38 * returned to the caller. 39 */ 40 41 #include <fmd_alloc.h> 42 #include <fmd_error.h> 43 #include <fmd_subr.h> 44 #include <fmd_topo.h> 45 #include <fmd.h> 46 47 #include <string.h> 48 #include <unistd.h> 49 #include <sys/types.h> 50 #include <fm/fmd_fmri.h> 51 #include <fm/libtopo.h> 52 53 static void 54 fmd_topo_update(void) 55 { 56 int err; 57 topo_hdl_t *tp; 58 fmd_topo_t *ftp; 59 char *id; 60 const char *name; 61 62 ASSERT(MUTEX_HELD(&fmd.d_topo_lock)); 63 64 name = fmd.d_rootdir != NULL && 65 *fmd.d_rootdir != '\0' ? fmd.d_rootdir : NULL; 66 67 /* 68 * Update the topology snapshot. 69 */ 70 if ((tp = topo_open(TOPO_VERSION, name, &err)) == NULL) 71 fmd_panic("failed to open topology library: %s", 72 topo_strerror(err)); 73 74 if ((id = topo_snap_hold(tp, NULL, &err)) == NULL) 75 fmd_panic("failed to get topology snapshot: %s", 76 topo_strerror(err)); 77 78 topo_hdl_strfree(tp, id); 79 80 ftp = fmd_alloc(sizeof (fmd_topo_t), FMD_SLEEP); 81 ftp->ft_hdl = tp; 82 fmd.d_stats->ds_topo_gen.fmds_value.ui64++; 83 fmd_list_prepend(&fmd.d_topo_list, ftp); 84 85 } 86 87 topo_hdl_t * 88 fmd_topo_handle(int version) 89 { 90 uint64_t curgen; 91 fmd_topo_t *ftp; 92 93 if (version != TOPO_VERSION) 94 return (NULL); 95 96 (void) pthread_mutex_lock(&fmd.d_topo_lock); 97 if ((curgen = fmd_fmri_get_drgen()) > 98 fmd.d_stats->ds_topo_drgen.fmds_value.ui64) { 99 fmd.d_stats->ds_topo_drgen.fmds_value.ui64 = curgen; 100 fmd_topo_update(); 101 } 102 ftp = fmd_list_next(&fmd.d_topo_list); 103 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 104 105 return ((topo_hdl_t *)ftp->ft_hdl); 106 } 107 108 void 109 fmd_topo_init(void) 110 { 111 (void) pthread_mutex_lock(&fmd.d_topo_lock); 112 fmd_topo_update(); 113 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 114 } 115 116 void 117 fmd_topo_fini(void) 118 { 119 fmd_topo_t *ftp; 120 121 (void) pthread_mutex_lock(&fmd.d_topo_lock); 122 while ((ftp = fmd_list_next(&fmd.d_topo_list)) != NULL) { 123 fmd_list_delete(&fmd.d_topo_list, ftp); 124 topo_close(ftp->ft_hdl); 125 fmd_free(ftp, sizeof (fmd_topo_t)); 126 } 127 (void) pthread_mutex_unlock(&fmd.d_topo_lock); 128 } 129