kern_shutdown.c revision 113633
117658Sjulian/*- 217658Sjulian * Copyright (c) 1986, 1988, 1991, 1993 317658Sjulian * The Regents of the University of California. All rights reserved. 417658Sjulian * (c) UNIX System Laboratories, Inc. 517658Sjulian * All or some portions of this file are derived from material licensed 617658Sjulian * to the University of California by American Telephone and Telegraph 717658Sjulian * Co. or Unix System Laboratories, Inc. and are reproduced herein with 817658Sjulian * the permission of UNIX System Laboratories, Inc. 917658Sjulian * 1017658Sjulian * Redistribution and use in source and binary forms, with or without 1117658Sjulian * modification, are permitted provided that the following conditions 1217658Sjulian * are met: 1317658Sjulian * 1. Redistributions of source code must retain the above copyright 1417658Sjulian * notice, this list of conditions and the following disclaimer. 1517658Sjulian * 2. Redistributions in binary form must reproduce the above copyright 1617658Sjulian * notice, this list of conditions and the following disclaimer in the 1717658Sjulian * documentation and/or other materials provided with the distribution. 1817658Sjulian * 3. All advertising materials mentioning features or use of this software 1917658Sjulian * must display the following acknowledgement: 2017658Sjulian * This product includes software developed by the University of 2117658Sjulian * California, Berkeley and its contributors. 2217658Sjulian * 4. Neither the name of the University nor the names of its contributors 2317658Sjulian * may be used to endorse or promote products derived from this software 2417658Sjulian * without specific prior written permission. 2517658Sjulian * 2617658Sjulian * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2717658Sjulian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2817658Sjulian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2917658Sjulian * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3017658Sjulian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3117658Sjulian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3217658Sjulian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3317658Sjulian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3417658Sjulian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3517658Sjulian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3617658Sjulian * SUCH DAMAGE. 3717658Sjulian * 3817658Sjulian * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 3950477Speter * $FreeBSD: head/sys/kern/kern_shutdown.c 113633 2003-04-17 22:29:23Z jhb $ 4017658Sjulian */ 4117658Sjulian 4217658Sjulian#include "opt_ddb.h" 43103647Sjhb#include "opt_ddb_trace.h" 44103647Sjhb#include "opt_ddb_unattended.h" 4533445Seivind#include "opt_hw_wdog.h" 46106024Srwatson#include "opt_mac.h" 4728976Sbde#include "opt_panic.h" 4828976Sbde#include "opt_show_busybufs.h" 4917658Sjulian 5017658Sjulian#include <sys/param.h> 5117658Sjulian#include <sys/systm.h> 5260041Sphk#include <sys/bio.h> 5331275Sbde#include <sys/buf.h> 5478767Sjhb#include <sys/conf.h> 5578767Sjhb#include <sys/cons.h> 5678767Sjhb#include <sys/eventhandler.h> 5717658Sjulian#include <sys/kernel.h> 5855539Sluoqi#include <sys/kthread.h> 59106024Srwatson#include <sys/mac.h> 6089601Ssobomax#include <sys/malloc.h> 6121776Sbde#include <sys/mount.h> 6278767Sjhb#include <sys/proc.h> 6378767Sjhb#include <sys/reboot.h> 6478767Sjhb#include <sys/resourcevar.h> 6578767Sjhb#include <sys/smp.h> /* smp_active */ 6617658Sjulian#include <sys/sysctl.h> 6717658Sjulian#include <sys/sysproto.h> 6878767Sjhb#include <sys/vnode.h> 6917658Sjulian 7094169Sphk#include <machine/pcb.h> 7117658Sjulian#include <machine/md_var.h> 7291778Sjake#include <machine/smp.h> 7317658Sjulian 7417658Sjulian#include <sys/signalvar.h> 7582119Sjhb#ifdef DDB 7682119Sjhb#include <ddb/ddb.h> 7782119Sjhb#endif 7817658Sjulian 7917658Sjulian#ifndef PANIC_REBOOT_WAIT_TIME 8017658Sjulian#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 8117658Sjulian#endif 8217658Sjulian 8317658Sjulian/* 8417658Sjulian * Note that stdarg.h and the ANSI style va_start macro is used for both 8517658Sjulian * ANSI and traditional C compilers. 8617658Sjulian */ 8717658Sjulian#include <machine/stdarg.h> 8817658Sjulian 8928769Sbde#ifdef DDB 9017658Sjulian#ifdef DDB_UNATTENDED 9142135Smsmithint debugger_on_panic = 0; 9217658Sjulian#else 9342135Smsmithint debugger_on_panic = 1; 9417658Sjulian#endif 9517658SjulianSYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 9646381Sbillf &debugger_on_panic, 0, "Run debugger on kernel panic"); 97103647Sjhb 98103647Sjhb#ifdef DDB_TRACE 99103647Sjhbint trace_on_panic = 1; 100103647Sjhb#else 101103647Sjhbint trace_on_panic = 0; 10217658Sjulian#endif 103103647SjhbSYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW, 104103647Sjhb &trace_on_panic, 0, "Print stack trace on kernel panic"); 105103647Sjhb#endif 10617658Sjulian 10785202Speterint sync_on_panic = 1; 10885202SpeterSYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW, 10985202Speter &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 11085202Speter 11143436SmsmithSYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 11243436Smsmith 11328000Sjulian#ifdef HW_WDOG 11417658Sjulian/* 11527997Sjulian * If there is a hardware watchdog, point this at the function needed to 11627997Sjulian * hold it off. 11727997Sjulian * It's needed when the kernel needs to do some lengthy operations. 11827997Sjulian * e.g. in wd.c when dumping core.. It's most annoying to have 11927997Sjulian * your precious core-dump only half written because the wdog kicked in. 12027997Sjulian */ 12127997Sjulianwatchdog_tickle_fn wdog_tickler = NULL; 12228000Sjulian#endif /* HW_WDOG */ 12327997Sjulian 12427997Sjulian/* 12517658Sjulian * Variable panicstr contains argument to first call to panic; used as flag 12617658Sjulian * to indicate that the kernel has already called panic. 12717658Sjulian */ 12817658Sjulianconst char *panicstr; 12917658Sjulian 13093496Sphkint dumping; /* system is dumping */ 13193496Sphkstatic struct dumperinfo dumper; /* our selected dumper */ 13294169Sphkstatic struct pcb dumppcb; /* "You Are Here" sign for dump-debuggers */ 13367093Sps 13465395Speterstatic void boot(int) __dead2; 13565395Speterstatic void poweroff_wait(void *, int); 13665395Speterstatic void shutdown_halt(void *junk, int howto); 13765395Speterstatic void shutdown_panic(void *junk, int howto); 13865395Speterstatic void shutdown_reset(void *junk, int howto); 13917658Sjulian 14050107Smsmith/* register various local shutdown events */ 141110859Salfredstatic void 14250107Smsmithshutdown_conf(void *unused) 14350107Smsmith{ 144110859Salfred 145110859Salfred EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 146110859Salfred SHUTDOWN_PRI_FIRST); 147110859Salfred EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 148110859Salfred SHUTDOWN_PRI_LAST + 100); 149110859Salfred EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 150110859Salfred SHUTDOWN_PRI_LAST + 100); 151110859Salfred EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, 152110859Salfred SHUTDOWN_PRI_LAST + 200); 15350107Smsmith} 15448868Sphk 15550107SmsmithSYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 15650107Smsmith 15717658Sjulian/* 15817658Sjulian * The system call that results in a reboot 15982749Sdillon * 16082749Sdillon * MPSAFE 16117658Sjulian */ 16282749Sdillon/* ARGSUSED */ 16317658Sjulianint 16483366Sjulianreboot(struct thread *td, struct reboot_args *uap) 16517658Sjulian{ 16617658Sjulian int error; 16717658Sjulian 168106024Srwatson error = 0; 169106024Srwatson#ifdef MAC 170106024Srwatson error = mac_check_system_reboot(td->td_ucred, uap->opt); 171106024Srwatson#endif 172106024Srwatson if (error == 0) 173106024Srwatson error = suser(td); 174106024Srwatson if (error == 0) { 175106024Srwatson mtx_lock(&Giant); 17682749Sdillon boot(uap->opt); 177106024Srwatson mtx_unlock(&Giant); 178106024Srwatson } 17982749Sdillon return (error); 18017658Sjulian} 18117658Sjulian 18217658Sjulian/* 18317658Sjulian * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 18417658Sjulian */ 18565268Smsmithstatic int shutdown_howto = 0; 18665268Smsmith 18717658Sjulianvoid 18865268Smsmithshutdown_nice(int howto) 18917658Sjulian{ 190110859Salfred 19165268Smsmith shutdown_howto = howto; 192110859Salfred 19317658Sjulian /* Send a signal to init(8) and have it shutdown the world */ 19417658Sjulian if (initproc != NULL) { 19573913Sjhb PROC_LOCK(initproc); 19617658Sjulian psignal(initproc, SIGINT); 19773913Sjhb PROC_UNLOCK(initproc); 19817658Sjulian } else { 19917658Sjulian /* No init(8) running, so simply reboot */ 20017658Sjulian boot(RB_NOSYNC); 20117658Sjulian } 20217658Sjulian return; 20317658Sjulian} 20417658Sjulianstatic int waittime = -1; 20517658Sjulian 20654233Sphkstatic void 20765395Speterprint_uptime(void) 20854233Sphk{ 20954233Sphk int f; 21054233Sphk struct timespec ts; 21154233Sphk 21254233Sphk getnanouptime(&ts); 21354233Sphk printf("Uptime: "); 21454233Sphk f = 0; 21554233Sphk if (ts.tv_sec >= 86400) { 21665764Sjhb printf("%ldd", (long)ts.tv_sec / 86400); 21754233Sphk ts.tv_sec %= 86400; 21854233Sphk f = 1; 21954233Sphk } 22054233Sphk if (f || ts.tv_sec >= 3600) { 22165764Sjhb printf("%ldh", (long)ts.tv_sec / 3600); 22254233Sphk ts.tv_sec %= 3600; 22354233Sphk f = 1; 22454233Sphk } 22554233Sphk if (f || ts.tv_sec >= 60) { 22665764Sjhb printf("%ldm", (long)ts.tv_sec / 60); 22754233Sphk ts.tv_sec %= 60; 22854233Sphk f = 1; 22954233Sphk } 23065764Sjhb printf("%lds\n", (long)ts.tv_sec); 23154233Sphk} 23254233Sphk 23394169Sphkstatic void 23494169Sphkdoadump(void) 23594169Sphk{ 236110859Salfred 23794169Sphk savectx(&dumppcb); 23894169Sphk dumping++; 23994169Sphk dumpsys(&dumper); 24094169Sphk} 24194169Sphk 24217658Sjulian/* 24317658Sjulian * Go through the rigmarole of shutting down.. 24417658Sjulian * this used to be in machdep.c but I'll be dammned if I could see 24517658Sjulian * anything machine dependant in it. 24617658Sjulian */ 24731275Sbdestatic void 24865395Speterboot(int howto) 24917658Sjulian{ 25017658Sjulian 25165268Smsmith /* collect extra flags that shutdown_nice might have set */ 25265268Smsmith howto |= shutdown_howto; 25365268Smsmith 25482119Sjhb#ifdef DDB 25582119Sjhb /* We are out of the debugger now. */ 25682119Sjhb db_active = 0; 25782119Sjhb#endif 25882119Sjhb 25925164Speter#ifdef SMP 26065395Speter if (smp_active) 26170861Sjake printf("boot() called on cpu#%d\n", PCPU_GET(cpuid)); 26225164Speter#endif 26327997Sjulian /* 26427997Sjulian * Do any callouts that should be done BEFORE syncing the filesystems. 26527997Sjulian */ 26650107Smsmith EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 26727997Sjulian 26827997Sjulian /* 26927997Sjulian * Now sync filesystems 27027997Sjulian */ 27117658Sjulian if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 27217658Sjulian register struct buf *bp; 27365707Sjasone int iter, nbusy, pbusy; 27465707Sjasone int subiter; 27517658Sjulian 27617658Sjulian waittime = 0; 277107036Salfred printf("\nsyncing disks, buffers remaining... "); 27817658Sjulian 27990361Sjulian sync(&thread0, NULL); 28017658Sjulian 28134266Sjulian /* 28234266Sjulian * With soft updates, some buffers that are 28334266Sjulian * written will be remarked as dirty until other 28434266Sjulian * buffers are written. 28534266Sjulian */ 28665707Sjasone for (iter = pbusy = 0; iter < 20; iter++) { 28717658Sjulian nbusy = 0; 28817658Sjulian for (bp = &buf[nbuf]; --bp >= buf; ) { 28948225Smckusick if ((bp->b_flags & B_INVAL) == 0 && 29048225Smckusick BUF_REFCNT(bp) > 0) { 29117658Sjulian nbusy++; 29234266Sjulian } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 29334266Sjulian == B_DELWRI) { 29434266Sjulian /* bawrite(bp);*/ 29534266Sjulian nbusy++; 29617658Sjulian } 29717658Sjulian } 29817658Sjulian if (nbusy == 0) 29917658Sjulian break; 30017658Sjulian printf("%d ", nbusy); 30165707Sjasone if (nbusy < pbusy) 30265707Sjasone iter = 0; 30365707Sjasone pbusy = nbusy; 30490361Sjulian sync(&thread0, NULL); 30583366Sjulian if (curthread != NULL) { 30688900Sjhb DROP_GIANT(); 30765707Sjasone for (subiter = 0; subiter < 50 * iter; subiter++) { 30872200Sbmilekic mtx_lock_spin(&sched_lock); 30983366Sjulian curthread->td_proc->p_stats->p_ru.ru_nvcsw++; 31065707Sjasone mi_switch(); /* Allow interrupt threads to run */ 31172200Sbmilekic mtx_unlock_spin(&sched_lock); 31265707Sjasone DELAY(1000); 31365707Sjasone } 31468808Sjhb PICKUP_GIANT(); 31565707Sjasone } else 31634266Sjulian DELAY(50000 * iter); 31717658Sjulian } 31853023Sphk printf("\n"); 31941137Smsmith /* 32041137Smsmith * Count only busy local buffers to prevent forcing 32141137Smsmith * a fsck if we're just a client of a wedged NFS server 32241137Smsmith */ 32341137Smsmith nbusy = 0; 32441137Smsmith for (bp = &buf[nbuf]; --bp >= buf; ) { 32548225Smckusick if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 32648225Smckusick ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 32753023Sphk if (bp->b_dev == NODEV) { 32853452Sphk TAILQ_REMOVE(&mountlist, 32948225Smckusick bp->b_vp->v_mount, mnt_list); 33053023Sphk continue; 33153023Sphk } 33253023Sphk nbusy++; 33353023Sphk#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 33453023Sphk printf( 335110585Sjeff "%d: dev:%s, flags:%0x, blkno:%ld, lblkno:%ld\n", 33653023Sphk nbusy, devtoname(bp->b_dev), 33753023Sphk bp->b_flags, (long)bp->b_blkno, 33853023Sphk (long)bp->b_lblkno); 33953023Sphk#endif 34046568Speter } 34141137Smsmith } 34217658Sjulian if (nbusy) { 34317658Sjulian /* 34417658Sjulian * Failed to sync all blocks. Indicate this and don't 34517658Sjulian * unmount filesystems (thus forcing an fsck on reboot). 34617658Sjulian */ 34753023Sphk printf("giving up on %d buffers\n", nbusy); 34817658Sjulian DELAY(5000000); /* 5 seconds */ 34917658Sjulian } else { 35017658Sjulian printf("done\n"); 35117658Sjulian /* 35217658Sjulian * Unmount filesystems 35317658Sjulian */ 35417658Sjulian if (panicstr == 0) 35517658Sjulian vfs_unmountall(); 35617658Sjulian } 35739237Sgibbs DELAY(100000); /* wait for console output to finish */ 35817658Sjulian } 35927997Sjulian 36054233Sphk print_uptime(); 36154233Sphk 36227997Sjulian /* 36327997Sjulian * Ok, now do things that assume all filesystem activity has 36427997Sjulian * been completed. 36527997Sjulian */ 36650107Smsmith EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 36739237Sgibbs splhigh(); 36893496Sphk if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && 36994169Sphk !cold && dumper.dumper != NULL && !dumping) 37094169Sphk doadump(); 37139237Sgibbs 37239237Sgibbs /* Now that we're going to really halt the system... */ 37350107Smsmith EVENTHANDLER_INVOKE(shutdown_final, howto); 37439237Sgibbs 37550107Smsmith for(;;) ; /* safety against shutdown_reset not working */ 37650107Smsmith /* NOTREACHED */ 37750107Smsmith} 37850107Smsmith 37950107Smsmith/* 38050107Smsmith * If the shutdown was a clean halt, behave accordingly. 38150107Smsmith */ 38250107Smsmithstatic void 38350107Smsmithshutdown_halt(void *junk, int howto) 38450107Smsmith{ 385110859Salfred 38617658Sjulian if (howto & RB_HALT) { 38717658Sjulian printf("\n"); 38817658Sjulian printf("The operating system has halted.\n"); 38917658Sjulian printf("Please press any key to reboot.\n\n"); 39019274Sjulian switch (cngetc()) { 39119274Sjulian case -1: /* No console, just die */ 39219274Sjulian cpu_halt(); 39319274Sjulian /* NOTREACHED */ 39419274Sjulian default: 39539237Sgibbs howto &= ~RB_HALT; 39619274Sjulian break; 39719274Sjulian } 39850107Smsmith } 39950107Smsmith} 40017658Sjulian 40150107Smsmith/* 40250107Smsmith * Check to see if the system paniced, pause and then reboot 40350107Smsmith * according to the specified delay. 40450107Smsmith */ 40550107Smsmithstatic void 40650107Smsmithshutdown_panic(void *junk, int howto) 40750107Smsmith{ 40850107Smsmith int loop; 40950107Smsmith 41050107Smsmith if (howto & RB_DUMP) { 41139237Sgibbs if (PANIC_REBOOT_WAIT_TIME != 0) { 41239237Sgibbs if (PANIC_REBOOT_WAIT_TIME != -1) { 41339237Sgibbs printf("Automatic reboot in %d seconds - " 41439237Sgibbs "press a key on the console to abort\n", 41539237Sgibbs PANIC_REBOOT_WAIT_TIME); 41639237Sgibbs for (loop = PANIC_REBOOT_WAIT_TIME * 10; 41739237Sgibbs loop > 0; --loop) { 41839237Sgibbs DELAY(1000 * 100); /* 1/10th second */ 41939237Sgibbs /* Did user type a key? */ 42039237Sgibbs if (cncheckc() != -1) 42139237Sgibbs break; 42217658Sjulian } 42339237Sgibbs if (!loop) 42450107Smsmith return; 42517658Sjulian } 42639237Sgibbs } else { /* zero time specified - reboot NOW */ 42750107Smsmith return; 42817658Sjulian } 42989522Snik printf("--> Press a key on the console to reboot,\n"); 43089522Snik printf("--> or switch off the system now.\n"); 43139237Sgibbs cngetc(); 43217658Sjulian } 43350107Smsmith} 43450107Smsmith 43550107Smsmith/* 43650107Smsmith * Everything done, now reset 43750107Smsmith */ 43850107Smsmithstatic void 43950107Smsmithshutdown_reset(void *junk, int howto) 44050107Smsmith{ 441110859Salfred 44217658Sjulian printf("Rebooting...\n"); 44317658Sjulian DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 44417677Sjulian /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 44517658Sjulian cpu_reset(); 44650107Smsmith /* NOTREACHED */ /* assuming reset worked */ 44717658Sjulian} 44817658Sjulian 449108682Sphk/* 450108682Sphk * Print a backtrace if we can. 451108682Sphk */ 452108682Sphk 453108682Sphkvoid 454108682Sphkbacktrace(void) 455108682Sphk{ 456110859Salfred 457108682Sphk#ifdef DDB 458110778Speter printf("Stack backtrace:\n"); 459108682Sphk db_print_backtrace(); 460108682Sphk#else 461108682Sphk printf("Sorry, need DDB option to print backtrace"); 462108682Sphk#endif 463108682Sphk} 464108682Sphk 46575570Sjhb#ifdef SMP 466101155Sjhbstatic u_int panic_cpu = NOCPU; 46775570Sjhb#endif 46875570Sjhb 46917658Sjulian/* 47017658Sjulian * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 47117658Sjulian * and then reboots. If we are called twice, then we avoid trying to sync 47217658Sjulian * the disks as this often leads to recursive panics. 47382749Sdillon * 47482749Sdillon * MPSAFE 47517658Sjulian */ 47617658Sjulianvoid 47717658Sjulianpanic(const char *fmt, ...) 47817658Sjulian{ 479100209Sgallatin struct thread *td = curthread; 480103647Sjhb int bootopt, newpanic; 48117658Sjulian va_list ap; 48238874Sache static char buf[256]; 48317658Sjulian 48465557Sjasone#ifdef SMP 48582115Sjhb /* 48682115Sjhb * We don't want multiple CPU's to panic at the same time, so we 487101155Sjhb * use panic_cpu as a simple spinlock. We have to keep checking 488101155Sjhb * panic_cpu if we are spinning in case the panic on the first 48982115Sjhb * CPU is canceled. 49082115Sjhb */ 491101155Sjhb if (panic_cpu != PCPU_GET(cpuid)) 492101155Sjhb while (atomic_cmpset_int(&panic_cpu, NOCPU, 493101155Sjhb PCPU_GET(cpuid)) == 0) 494101155Sjhb while (panic_cpu != NOCPU) 495101155Sjhb ; /* nothing */ 49665557Sjasone#endif 49765557Sjasone 49817658Sjulian bootopt = RB_AUTOBOOT | RB_DUMP; 499103647Sjhb newpanic = 0; 50017658Sjulian if (panicstr) 50117658Sjulian bootopt |= RB_NOSYNC; 502103647Sjhb else { 50317658Sjulian panicstr = fmt; 504103647Sjhb newpanic = 1; 505103647Sjhb } 50617658Sjulian 50717658Sjulian va_start(ap, fmt); 50841514Sarchie (void)vsnprintf(buf, sizeof(buf), fmt, ap); 50938874Sache if (panicstr == fmt) 51038874Sache panicstr = buf; 51117658Sjulian va_end(ap); 51238874Sache printf("panic: %s\n", buf); 51326100Sfsmp#ifdef SMP 51472091Sasmodai /* two separate prints in case of an unmapped page and trap */ 51570861Sjake printf("cpuid = %d; ", PCPU_GET(cpuid)); 51669335Sjhb#ifdef APIC_IO 51729128Speter printf("lapic.id = %08x\n", lapic.id); 51899828Sjhb#else 51999828Sjhb printf("\n"); 52026100Sfsmp#endif 52169335Sjhb#endif 52217658Sjulian 52317658Sjulian#if defined(DDB) 524103647Sjhb if (newpanic && trace_on_panic) 525110778Speter backtrace(); 52617658Sjulian if (debugger_on_panic) 52717658Sjulian Debugger ("panic"); 52882223Sjhb#ifdef RESTARTABLE_PANICS 52982115Sjhb /* See if the user aborted the panic, in which case we continue. */ 53082115Sjhb if (panicstr == NULL) { 53182115Sjhb#ifdef SMP 532101155Sjhb atomic_store_rel_int(&panic_cpu, NOCPU); 53317658Sjulian#endif 53482115Sjhb return; 53582115Sjhb } 53682115Sjhb#endif 53782223Sjhb#endif 538113633Sjhb mtx_lock_spin(&sched_lock); 539100209Sgallatin td->td_flags |= TDF_INPANIC; 540113633Sjhb mtx_unlock_spin(&sched_lock); 54185202Speter if (!sync_on_panic) 54285202Speter bootopt |= RB_NOSYNC; 54317658Sjulian boot(bootopt); 54417658Sjulian} 54517658Sjulian 54617768Sjulian/* 54743436Smsmith * Support for poweroff delay. 54843436Smsmith */ 54954248Smsmith#ifndef POWEROFF_DELAY 55054248Smsmith# define POWEROFF_DELAY 5000 55154248Smsmith#endif 55254248Smsmithstatic int poweroff_delay = POWEROFF_DELAY; 55354248Smsmith 55443436SmsmithSYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 55543436Smsmith &poweroff_delay, 0, ""); 55643436Smsmith 557110859Salfredstatic void 55850107Smsmithpoweroff_wait(void *junk, int howto) 55943436Smsmith{ 560110859Salfred 561110859Salfred if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 56243436Smsmith return; 56343436Smsmith DELAY(poweroff_delay * 1000); 56443436Smsmith} 56555539Sluoqi 56655539Sluoqi/* 56755539Sluoqi * Some system processes (e.g. syncer) need to be stopped at appropriate 56855539Sluoqi * points in their main loops prior to a system shutdown, so that they 56955539Sluoqi * won't interfere with the shutdown process (e.g. by holding a disk buf 57055539Sluoqi * to cause sync to fail). For each of these system processes, register 57155539Sluoqi * shutdown_kproc() as a handler for one of shutdown events. 57255539Sluoqi */ 57355539Sluoqistatic int kproc_shutdown_wait = 60; 57455539SluoqiSYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 57555539Sluoqi &kproc_shutdown_wait, 0, ""); 57655539Sluoqi 57755539Sluoqivoid 57870063Sjhbkproc_shutdown(void *arg, int howto) 57955539Sluoqi{ 58055539Sluoqi struct proc *p; 58155539Sluoqi int error; 58255539Sluoqi 58355539Sluoqi if (panicstr) 58455539Sluoqi return; 58555539Sluoqi 58655539Sluoqi p = (struct proc *)arg; 58755539Sluoqi printf("Waiting (max %d seconds) for system process `%s' to stop...", 58855862Sluoqi kproc_shutdown_wait, p->p_comm); 58970063Sjhb error = kthread_suspend(p, kproc_shutdown_wait * hz); 59055539Sluoqi 59155539Sluoqi if (error == EWOULDBLOCK) 59255539Sluoqi printf("timed out\n"); 59355539Sluoqi else 59455539Sluoqi printf("stopped\n"); 59555539Sluoqi} 59693496Sphk 59793496Sphk/* Registration of dumpers */ 59893496Sphkint 59993496Sphkset_dumper(struct dumperinfo *di) 60093496Sphk{ 601110859Salfred 60293496Sphk if (di == NULL) { 60393496Sphk bzero(&dumper, sizeof dumper); 60493496Sphk return (0); 60593496Sphk } 60693496Sphk if (dumper.dumper != NULL) 60793496Sphk return (EBUSY); 60893496Sphk dumper = *di; 60993496Sphk return (0); 61093496Sphk} 61193496Sphk 612105531Stmm#if defined(__powerpc__) 61393496Sphkvoid 61493496Sphkdumpsys(struct dumperinfo *di __unused) 61593496Sphk{ 61693496Sphk 61793496Sphk printf("Kernel dumps not implemented on this architecture\n"); 61893496Sphk} 61993496Sphk#endif 620