fmd/common/fmd_topo.c

0eb822a1c0c2bea495647510b75f77f0e57633ebcindi/*
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi * CDDL HEADER START
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0eb822a1c0c2bea495647510b75f77f0e57633ebcindi *
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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0eb822a1c0c2bea495647510b75f77f0e57633ebcindi */
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi/*
8393544efeffe8042bf5273c148010b32fa827e2Hyon Kim * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi */
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi/*
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi * FMD Topology Handling
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi *
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi * Fault manager scheme and module plug-ins may need access to the latest
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi * libtopo snapshot.  Upon fmd initialization, a snapshot is taken and
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi * made available via fmd_fmri_topology() and fmd_hdl_topology().  Each
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi * of these routines returns a libtopo snapshot handle back to the caller.
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi * New snapshots are taken if and when a DR event causes the DR generation
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi * number to increase.  The current snapshot is retained to assure consistency
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi * for modules still using older snapshots and the latest snapshot handle is
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi * returned to the caller.
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi */
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi#include <fmd_alloc.h>
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi#include <fmd_error.h>
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi#include <fmd_subr.h>
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi#include <fmd_topo.h>
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi#include <fmd.h>
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi#include <string.h>
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi#include <unistd.h>
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi#include <sys/types.h>
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi#include <fm/fmd_fmri.h>
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi#include <fm/libtopo.h>
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
0eb822a1c0c2bea495647510b75f77f0e57633ebcindistatic void
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrockfmd_topo_rele_locked(fmd_topo_t *ftp)
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock{
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    ASSERT(MUTEX_HELD(&fmd.d_topo_lock));
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    if (--ftp->ft_refcount == 0) {
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock        fmd_list_delete(&fmd.d_topo_list, ftp);
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock        topo_close(ftp->ft_hdl);
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock        fmd_free(ftp, sizeof (fmd_topo_t));
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    }
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock}
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrockvoid
8393544efeffe8042bf5273c148010b32fa827e2Hyon Kimfmd_topo_update(void)
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi{
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    int err;
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    topo_hdl_t *tp;
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    fmd_topo_t *ftp, *prev;
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    char *id;
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    const char *name;
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    (void) pthread_mutex_lock(&fmd.d_topo_lock);
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    fmd.d_stats->ds_topo_drgen.fmds_value.ui64 = fmd_fmri_get_drgen();
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    name = fmd.d_rootdir != NULL &&
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi        *fmd.d_rootdir != '\0' ? fmd.d_rootdir : NULL;
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    /*
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi     * Update the topology snapshot.
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi     */
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    if ((tp = topo_open(TOPO_VERSION, name, &err)) == NULL)
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi        fmd_panic("failed to open topology library: %s",
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi            topo_strerror(err));
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
07312882d9573a94daa8260c0744011540574003Eric Schrock    ftp = fmd_alloc(sizeof (fmd_topo_t), FMD_SLEEP);
07312882d9573a94daa8260c0744011540574003Eric Schrock    ftp->ft_hdl = tp;
07312882d9573a94daa8260c0744011540574003Eric Schrock    ftp->ft_time_begin = fmd_time_gethrtime();
07312882d9573a94daa8260c0744011540574003Eric Schrock
8393544efeffe8042bf5273c148010b32fa827e2Hyon Kim    if ((id = topo_snap_hold(tp, NULL, &err)) == NULL)
8393544efeffe8042bf5273c148010b32fa827e2Hyon Kim        fmd_panic("failed to get topology snapshot: %s",
8393544efeffe8042bf5273c148010b32fa827e2Hyon Kim            topo_strerror(err));
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    topo_hdl_strfree(tp, id);
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
07312882d9573a94daa8260c0744011540574003Eric Schrock    ftp->ft_time_end = fmd_time_gethrtime();
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    fmd.d_stats->ds_topo_gen.fmds_value.ui64++;
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    /*
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock     * We always keep a reference count on the last topo snapshot taken.
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock     * Release the previous snapshot (if present), and set the current
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock     * reference count to 1.
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock     */
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    if ((prev = fmd_list_next(&fmd.d_topo_list)) != NULL)
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock        fmd_topo_rele_locked(prev);
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    ftp->ft_refcount = 1;
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    fmd_list_prepend(&fmd.d_topo_list, ftp);
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    (void) pthread_mutex_unlock(&fmd.d_topo_lock);
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi}
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrockfmd_topo_t *
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrockfmd_topo_hold(void)
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi{
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    fmd_topo_t *ftp;
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    (void) pthread_mutex_lock(&fmd.d_topo_lock);
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    ftp = fmd_list_next(&fmd.d_topo_list);
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    ftp->ft_refcount++;
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    (void) pthread_mutex_unlock(&fmd.d_topo_lock);
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    return (ftp);
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi}
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
0eb822a1c0c2bea495647510b75f77f0e57633ebcindivoid
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrockfmd_topo_addref(fmd_topo_t *ftp)
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi{
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    (void) pthread_mutex_lock(&fmd.d_topo_lock);
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    ftp->ft_refcount++;
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    (void) pthread_mutex_unlock(&fmd.d_topo_lock);
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock}
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrockvoid
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrockfmd_topo_rele(fmd_topo_t *ftp)
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock{
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    (void) pthread_mutex_lock(&fmd.d_topo_lock);
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    fmd_topo_rele_locked(ftp);
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    (void) pthread_mutex_unlock(&fmd.d_topo_lock);
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi}
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrockvoid
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrockfmd_topo_rele_hdl(topo_hdl_t *thp)
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock{
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    fmd_topo_t *ftp;
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    (void) pthread_mutex_lock(&fmd.d_topo_lock);
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    for (ftp = fmd_list_next(&fmd.d_topo_list); ftp != NULL;
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock        ftp = fmd_list_next(ftp)) {
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock        if (ftp->ft_hdl == thp)
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock            break;
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    }
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    ASSERT(ftp != NULL);
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    fmd_topo_rele_locked(ftp);
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock    (void) pthread_mutex_unlock(&fmd.d_topo_lock);
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock}
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrockvoid
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrockfmd_topo_init(void)
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock{
8393544efeffe8042bf5273c148010b32fa827e2Hyon Kim    fmd_topo_update();
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock}
24db46411fd54f70c35b94bb952eb7ba040e43b4eschrock
0eb822a1c0c2bea495647510b75f77f0e57633ebcindivoid
0eb822a1c0c2bea495647510b75f77f0e57633ebcindifmd_topo_fini(void)
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi{
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    fmd_topo_t *ftp;
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    (void) pthread_mutex_lock(&fmd.d_topo_lock);
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    while ((ftp = fmd_list_next(&fmd.d_topo_list)) != NULL) {
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi        fmd_list_delete(&fmd.d_topo_list, ftp);
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi        topo_close(ftp->ft_hdl);
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi        fmd_free(ftp, sizeof (fmd_topo_t));
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    }
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi    (void) pthread_mutex_unlock(&fmd.d_topo_lock);
0eb822a1c0c2bea495647510b75f77f0e57633ebcindi}