10Sstevel@tonic-gate /* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 50Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 60Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 70Sstevel@tonic-gate * with the License. 80Sstevel@tonic-gate * 90Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 100Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 110Sstevel@tonic-gate * See the License for the specific language governing permissions 120Sstevel@tonic-gate * and limitations under the License. 130Sstevel@tonic-gate * 140Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 150Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 160Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 170Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 180Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 190Sstevel@tonic-gate * 200Sstevel@tonic-gate * CDDL HEADER END 210Sstevel@tonic-gate */ 220Sstevel@tonic-gate /* 23*1193Smws * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 240Sstevel@tonic-gate * Use is subject to license terms. 250Sstevel@tonic-gate */ 260Sstevel@tonic-gate 270Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 280Sstevel@tonic-gate 290Sstevel@tonic-gate /* 300Sstevel@tonic-gate * FMD Dynamic Reconfiguration (DR) Event Handling 310Sstevel@tonic-gate * 320Sstevel@tonic-gate * Fault manager scheme plug-ins must track characteristics of individual 330Sstevel@tonic-gate * pieces of hardware. As these components can be added or removed by a DR 340Sstevel@tonic-gate * operation, we need to provide a means by which plug-ins can determine when 350Sstevel@tonic-gate * they need to re-examine the current configuration. We provide a simple 360Sstevel@tonic-gate * mechanism whereby this task can be implemented using lazy evaluation: a 370Sstevel@tonic-gate * simple 64-bit generation counter is maintained and incremented on *any* DR. 380Sstevel@tonic-gate * Schemes can store the generation number in scheme-specific data structures, 390Sstevel@tonic-gate * and then revalidate their contents if the current generation number has 400Sstevel@tonic-gate * changed since the resource information was cached. This method saves time, 410Sstevel@tonic-gate * avoids the complexity of direct participation in DR, avoids the need for 420Sstevel@tonic-gate * resource-specific processing of DR events, and is relatively easy to port 430Sstevel@tonic-gate * to other systems that support dynamic reconfiguration. 440Sstevel@tonic-gate */ 450Sstevel@tonic-gate 460Sstevel@tonic-gate #include <sys/types.h> 470Sstevel@tonic-gate #include <sys/sysevent/dr.h> 480Sstevel@tonic-gate #include <sys/sysevent/eventdefs.h> 490Sstevel@tonic-gate 500Sstevel@tonic-gate #include <stdio.h> 51*1193Smws #include <unistd.h> 520Sstevel@tonic-gate #include <libsysevent.h> 530Sstevel@tonic-gate 540Sstevel@tonic-gate #undef MUTEX_HELD 550Sstevel@tonic-gate #undef RW_READ_HELD 560Sstevel@tonic-gate #undef RW_WRITE_HELD 570Sstevel@tonic-gate 580Sstevel@tonic-gate #include <fmd_error.h> 590Sstevel@tonic-gate #include <fmd_subr.h> 600Sstevel@tonic-gate #include <fmd.h> 610Sstevel@tonic-gate 620Sstevel@tonic-gate static void 630Sstevel@tonic-gate fmd_dr_event(sysevent_t *sep) 640Sstevel@tonic-gate { 650Sstevel@tonic-gate uint64_t gen; 660Sstevel@tonic-gate 670Sstevel@tonic-gate (void) pthread_mutex_lock(&fmd.d_stats_lock); 680Sstevel@tonic-gate gen = fmd.d_stats->ds_dr_gen.fmds_value.ui64++; 690Sstevel@tonic-gate (void) pthread_mutex_unlock(&fmd.d_stats_lock); 700Sstevel@tonic-gate 710Sstevel@tonic-gate TRACE((FMD_DBG_XPRT, "dr event %p, gen=%llu", (void *)sep, gen)); 720Sstevel@tonic-gate } 730Sstevel@tonic-gate 740Sstevel@tonic-gate void 750Sstevel@tonic-gate fmd_dr_init(void) 760Sstevel@tonic-gate { 770Sstevel@tonic-gate const char *subclass = ESC_DR_AP_STATE_CHANGE; 780Sstevel@tonic-gate 79*1193Smws if (geteuid() != 0) 80*1193Smws return; /* legacy sysevent mechanism is still root-only */ 810Sstevel@tonic-gate 820Sstevel@tonic-gate if ((fmd.d_dr_hdl = sysevent_bind_handle(fmd_dr_event)) == NULL) 830Sstevel@tonic-gate fmd_error(EFMD_EXIT, "failed to bind handle for DR sysevent"); 840Sstevel@tonic-gate 850Sstevel@tonic-gate if (sysevent_subscribe_event(fmd.d_dr_hdl, EC_DR, &subclass, 1) == -1) 860Sstevel@tonic-gate fmd_error(EFMD_EXIT, "failed to subscribe for DR sysevent"); 870Sstevel@tonic-gate } 880Sstevel@tonic-gate 890Sstevel@tonic-gate void 900Sstevel@tonic-gate fmd_dr_fini(void) 910Sstevel@tonic-gate { 920Sstevel@tonic-gate if (fmd.d_dr_hdl != NULL) { 930Sstevel@tonic-gate sysevent_unsubscribe_event(fmd.d_dr_hdl, EC_DR); 940Sstevel@tonic-gate sysevent_unbind_handle(fmd.d_dr_hdl); 950Sstevel@tonic-gate } 960Sstevel@tonic-gate } 97