1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START 3*7c478bd9Sstevel@tonic-gate * 4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*7c478bd9Sstevel@tonic-gate * with the License. 8*7c478bd9Sstevel@tonic-gate * 9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 12*7c478bd9Sstevel@tonic-gate * and limitations under the License. 13*7c478bd9Sstevel@tonic-gate * 14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*7c478bd9Sstevel@tonic-gate * 20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END 21*7c478bd9Sstevel@tonic-gate */ 22*7c478bd9Sstevel@tonic-gate /* 23*7c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*7c478bd9Sstevel@tonic-gate * Use is subject to license terms. 25*7c478bd9Sstevel@tonic-gate */ 26*7c478bd9Sstevel@tonic-gate 27*7c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*7c478bd9Sstevel@tonic-gate 29*7c478bd9Sstevel@tonic-gate /* 30*7c478bd9Sstevel@tonic-gate * FMD Dynamic Reconfiguration (DR) Event Handling 31*7c478bd9Sstevel@tonic-gate * 32*7c478bd9Sstevel@tonic-gate * Fault manager scheme plug-ins must track characteristics of individual 33*7c478bd9Sstevel@tonic-gate * pieces of hardware. As these components can be added or removed by a DR 34*7c478bd9Sstevel@tonic-gate * operation, we need to provide a means by which plug-ins can determine when 35*7c478bd9Sstevel@tonic-gate * they need to re-examine the current configuration. We provide a simple 36*7c478bd9Sstevel@tonic-gate * mechanism whereby this task can be implemented using lazy evaluation: a 37*7c478bd9Sstevel@tonic-gate * simple 64-bit generation counter is maintained and incremented on *any* DR. 38*7c478bd9Sstevel@tonic-gate * Schemes can store the generation number in scheme-specific data structures, 39*7c478bd9Sstevel@tonic-gate * and then revalidate their contents if the current generation number has 40*7c478bd9Sstevel@tonic-gate * changed since the resource information was cached. This method saves time, 41*7c478bd9Sstevel@tonic-gate * avoids the complexity of direct participation in DR, avoids the need for 42*7c478bd9Sstevel@tonic-gate * resource-specific processing of DR events, and is relatively easy to port 43*7c478bd9Sstevel@tonic-gate * to other systems that support dynamic reconfiguration. 44*7c478bd9Sstevel@tonic-gate */ 45*7c478bd9Sstevel@tonic-gate 46*7c478bd9Sstevel@tonic-gate #include <sys/types.h> 47*7c478bd9Sstevel@tonic-gate #include <sys/sysevent/dr.h> 48*7c478bd9Sstevel@tonic-gate #include <sys/sysevent/eventdefs.h> 49*7c478bd9Sstevel@tonic-gate 50*7c478bd9Sstevel@tonic-gate #include <stdio.h> 51*7c478bd9Sstevel@tonic-gate #include <libsysevent.h> 52*7c478bd9Sstevel@tonic-gate 53*7c478bd9Sstevel@tonic-gate #undef MUTEX_HELD 54*7c478bd9Sstevel@tonic-gate #undef RW_READ_HELD 55*7c478bd9Sstevel@tonic-gate #undef RW_WRITE_HELD 56*7c478bd9Sstevel@tonic-gate 57*7c478bd9Sstevel@tonic-gate #include <fmd_error.h> 58*7c478bd9Sstevel@tonic-gate #include <fmd_subr.h> 59*7c478bd9Sstevel@tonic-gate #include <fmd.h> 60*7c478bd9Sstevel@tonic-gate 61*7c478bd9Sstevel@tonic-gate static void 62*7c478bd9Sstevel@tonic-gate fmd_dr_event(sysevent_t *sep) 63*7c478bd9Sstevel@tonic-gate { 64*7c478bd9Sstevel@tonic-gate uint64_t gen; 65*7c478bd9Sstevel@tonic-gate 66*7c478bd9Sstevel@tonic-gate (void) pthread_mutex_lock(&fmd.d_stats_lock); 67*7c478bd9Sstevel@tonic-gate gen = fmd.d_stats->ds_dr_gen.fmds_value.ui64++; 68*7c478bd9Sstevel@tonic-gate (void) pthread_mutex_unlock(&fmd.d_stats_lock); 69*7c478bd9Sstevel@tonic-gate 70*7c478bd9Sstevel@tonic-gate TRACE((FMD_DBG_XPRT, "dr event %p, gen=%llu", (void *)sep, gen)); 71*7c478bd9Sstevel@tonic-gate } 72*7c478bd9Sstevel@tonic-gate 73*7c478bd9Sstevel@tonic-gate /* 74*7c478bd9Sstevel@tonic-gate * Initialize DR event subscription. Note: sysevent_bind_handle() calls 75*7c478bd9Sstevel@tonic-gate * door_create() internally. Door servers in fmd must be setup as fmd threads, 76*7c478bd9Sstevel@tonic-gate * and fmd_transport_init() already calls door_server_create() for us. We 77*7c478bd9Sstevel@tonic-gate * therefore rely on fmd_transport_init() being called before fmd_dr_init(). 78*7c478bd9Sstevel@tonic-gate */ 79*7c478bd9Sstevel@tonic-gate void 80*7c478bd9Sstevel@tonic-gate fmd_dr_init(void) 81*7c478bd9Sstevel@tonic-gate { 82*7c478bd9Sstevel@tonic-gate const char *subclass = ESC_DR_AP_STATE_CHANGE; 83*7c478bd9Sstevel@tonic-gate 84*7c478bd9Sstevel@tonic-gate ASSERT(fmd.d_xprt_chan != NULL); /* fmd_transport_init() has happened */ 85*7c478bd9Sstevel@tonic-gate 86*7c478bd9Sstevel@tonic-gate if ((fmd.d_dr_hdl = sysevent_bind_handle(fmd_dr_event)) == NULL) 87*7c478bd9Sstevel@tonic-gate fmd_error(EFMD_EXIT, "failed to bind handle for DR sysevent"); 88*7c478bd9Sstevel@tonic-gate 89*7c478bd9Sstevel@tonic-gate if (sysevent_subscribe_event(fmd.d_dr_hdl, EC_DR, &subclass, 1) == -1) 90*7c478bd9Sstevel@tonic-gate fmd_error(EFMD_EXIT, "failed to subscribe for DR sysevent"); 91*7c478bd9Sstevel@tonic-gate } 92*7c478bd9Sstevel@tonic-gate 93*7c478bd9Sstevel@tonic-gate void 94*7c478bd9Sstevel@tonic-gate fmd_dr_fini(void) 95*7c478bd9Sstevel@tonic-gate { 96*7c478bd9Sstevel@tonic-gate if (fmd.d_dr_hdl != NULL) { 97*7c478bd9Sstevel@tonic-gate sysevent_unsubscribe_event(fmd.d_dr_hdl, EC_DR); 98*7c478bd9Sstevel@tonic-gate sysevent_unbind_handle(fmd.d_dr_hdl); 99*7c478bd9Sstevel@tonic-gate } 100*7c478bd9Sstevel@tonic-gate } 101