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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
*/
/*
* FMD Dynamic Reconfiguration (DR) Event Handling
*
* Fault manager scheme plug-ins must track characteristics of individual
* pieces of hardware. As these components can be added or removed by a DR
* operation, we need to provide a means by which plug-ins can determine when
* they need to re-examine the current configuration. We provide a simple
* mechanism whereby this task can be implemented using lazy evaluation: a
* simple 64-bit generation counter is maintained and incremented on *any* DR.
* Schemes can store the generation number in scheme-specific data structures,
* and then revalidate their contents if the current generation number has
* changed since the resource information was cached. This method saves time,
* avoids the complexity of direct participation in DR, avoids the need for
* resource-specific processing of DR events, and is relatively easy to port
* to other systems that support dynamic reconfiguration.
*
* The dr generation is only incremented in response to hardware changes. Since
* ASRUs can be in any scheme, including the device scheme, we must also be
* aware of software configuration changes which may affect the resource cache.
* In addition, we take a snapshot of the topology whenever a reconfiguration
* event occurs and notify any modules of the change.
*/
#include <sys/types.h>
#include <sys/sunddi.h>
#include <sys/sysevent/dr.h>
#include <sys/sysevent/eventdefs.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <libsysevent.h>
#undef MUTEX_HELD
#undef RW_READ_HELD
#undef RW_WRITE_HELD
#include <fmd_asru.h>
#include <fmd_error.h>
#include <fmd_event.h>
#include <fmd_fmri.h>
#include <fmd_module.h>
#include <fmd_subr.h>
#include <fmd_topo.h>
#include <fmd.h>
void
fmd_dr_event(sysevent_t *sep)
{
uint64_t gen;
fmd_event_t *e;
const char *class = sysevent_get_class_name(sep);
const char *subclass = sysevent_get_subclass_name(sep);
hrtime_t evtime;
fmd_topo_t *ftp, *prev;
if (strcmp(class, EC_DR) == 0) {
if (strcmp(subclass, ESC_DR_AP_STATE_CHANGE) != 0 &&
strcmp(subclass, ESC_DR_TARGET_STATE_CHANGE) != 0)
return;
/* LINTED: E_NOP_IF_STMT */
} else if (strcmp(class, EC_DEVFS) == 0) {
/*
* A devfs configuration event can change the topology,
* as disk nodes only exist when the device is configured.
*/
} else if (strcmp(class, EC_PLATFORM) == 0) {
/*
* Since we rely on the SP to enumerate fans,
* power-supplies and sensors/leds, it would be prudent
* to take a new snapshot if the SP resets.
*/
if (strcmp(subclass, ESC_PLATFORM_SP_RESET) != 0)
return;
} else if (strcmp(class, EC_DEV_ADD) == 0 ||
strcmp(class, EC_DEV_REMOVE) == 0) {
if (strcmp(subclass, ESC_DISK) != 0)
return;
} else
return;
/*
* Take a topo snapshot and notify modules of the change. Picking an
* accurate time here is difficult. On one hand, we have the timestamp
* of the underlying sysevent, indicating when the reconfiguration event
* occurred. On the other hand, we are taking the topo snapshot
* asynchronously, and hence the timestamp of the snapshot is the
* current time. Pretending this topo snapshot was valid at the time
* the sysevent was posted seems wrong, so we instead opt for the
* current time as an upper bound on the snapshot validity.
*
* Along these lines, we keep track of the last time we dispatched a
* topo snapshot. If the sysevent occurred before the last topo
* snapshot, then don't bother dispatching another topo change event.
* We've already indicated (to the best of our ability) the change in
* topology. This prevents endless topo snapshots in response to a
* flurry of sysevents.
*/
sysevent_get_time(sep, &evtime);
prev = fmd_topo_hold();
if (evtime <= prev->ft_time_begin &&
fmd.d_clockops == &fmd_timeops_native) {
fmd_topo_rele(prev);
return;
}
fmd_topo_rele(prev);
(void) pthread_mutex_lock(&fmd.d_stats_lock);
gen = fmd.d_stats->ds_dr_gen.fmds_value.ui64++;
(void) pthread_mutex_unlock(&fmd.d_stats_lock);
TRACE((FMD_DBG_XPRT, "dr event %p, gen=%llu", (void *)sep, gen));
fmd_topo_update();
ftp = fmd_topo_hold();
e = fmd_event_create(FMD_EVT_TOPO, ftp->ft_time_end, NULL, ftp);
fmd_modhash_dispatch(fmd.d_mod_hash, e);
}
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