kern_shutdown.c revision 137263
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 * 4. Neither the name of the University nor the names of its contributors 1917658Sjulian * may be used to endorse or promote products derived from this software 2017658Sjulian * without specific prior written permission. 2117658Sjulian * 2217658Sjulian * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2317658Sjulian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2417658Sjulian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2517658Sjulian * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2617658Sjulian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2717658Sjulian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2817658Sjulian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2917658Sjulian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3017658Sjulian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3117658Sjulian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3217658Sjulian * SUCH DAMAGE. 3317658Sjulian * 3417658Sjulian * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 3517658Sjulian */ 3617658Sjulian 37116182Sobrien#include <sys/cdefs.h> 38116182Sobrien__FBSDID("$FreeBSD: head/sys/kern/kern_shutdown.c 137263 2004-11-05 18:29:10Z peter $"); 39116182Sobrien 40131927Smarcel#include "opt_kdb.h" 41106024Srwatson#include "opt_mac.h" 4228976Sbde#include "opt_panic.h" 4328976Sbde#include "opt_show_busybufs.h" 44134649Sscottl#include "opt_sched.h" 4517658Sjulian 4617658Sjulian#include <sys/param.h> 4717658Sjulian#include <sys/systm.h> 4860041Sphk#include <sys/bio.h> 4931275Sbde#include <sys/buf.h> 5078767Sjhb#include <sys/conf.h> 5178767Sjhb#include <sys/cons.h> 5278767Sjhb#include <sys/eventhandler.h> 53131927Smarcel#include <sys/kdb.h> 5417658Sjulian#include <sys/kernel.h> 5555539Sluoqi#include <sys/kthread.h> 56106024Srwatson#include <sys/mac.h> 5789601Ssobomax#include <sys/malloc.h> 5821776Sbde#include <sys/mount.h> 5978767Sjhb#include <sys/proc.h> 6078767Sjhb#include <sys/reboot.h> 6178767Sjhb#include <sys/resourcevar.h> 62137263Speter#include <sys/sched.h> 6378767Sjhb#include <sys/smp.h> /* smp_active */ 6417658Sjulian#include <sys/sysctl.h> 6517658Sjulian#include <sys/sysproto.h> 6678767Sjhb#include <sys/vnode.h> 6717658Sjulian 68118990Smarcel#include <machine/cpu.h> 6994169Sphk#include <machine/pcb.h> 7091778Sjake#include <machine/smp.h> 7117658Sjulian 7217658Sjulian#include <sys/signalvar.h> 7317658Sjulian 7417658Sjulian#ifndef PANIC_REBOOT_WAIT_TIME 7517658Sjulian#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 7617658Sjulian#endif 7717658Sjulian 7817658Sjulian/* 7917658Sjulian * Note that stdarg.h and the ANSI style va_start macro is used for both 8017658Sjulian * ANSI and traditional C compilers. 8117658Sjulian */ 8217658Sjulian#include <machine/stdarg.h> 8317658Sjulian 84131927Smarcel#ifdef KDB 85131927Smarcel#ifdef KDB_UNATTENDED 8642135Smsmithint debugger_on_panic = 0; 8717658Sjulian#else 8842135Smsmithint debugger_on_panic = 1; 8917658Sjulian#endif 9017658SjulianSYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 9146381Sbillf &debugger_on_panic, 0, "Run debugger on kernel panic"); 92103647Sjhb 93131927Smarcel#ifdef KDB_TRACE 94103647Sjhbint trace_on_panic = 1; 95103647Sjhb#else 96103647Sjhbint trace_on_panic = 0; 9717658Sjulian#endif 98103647SjhbSYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW, 99103647Sjhb &trace_on_panic, 0, "Print stack trace on kernel panic"); 100131927Smarcel#endif /* KDB */ 10117658Sjulian 102132506Srwatsonint sync_on_panic = 0; 10385202SpeterSYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW, 10485202Speter &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 10585202Speter 10643436SmsmithSYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 10743436Smsmith 10817658Sjulian/* 10917658Sjulian * Variable panicstr contains argument to first call to panic; used as flag 11017658Sjulian * to indicate that the kernel has already called panic. 11117658Sjulian */ 11217658Sjulianconst char *panicstr; 11317658Sjulian 11493496Sphkint dumping; /* system is dumping */ 11593496Sphkstatic struct dumperinfo dumper; /* our selected dumper */ 11667093Sps 117131927Smarcel/* Context information for dump-debuggers. */ 118131927Smarcelstatic struct pcb dumppcb; /* Registers. */ 119131927Smarcelstatic lwpid_t dumptid; /* Thread ID. */ 120131927Smarcel 12165395Speterstatic void boot(int) __dead2; 12265395Speterstatic void poweroff_wait(void *, int); 12365395Speterstatic void shutdown_halt(void *junk, int howto); 12465395Speterstatic void shutdown_panic(void *junk, int howto); 12565395Speterstatic void shutdown_reset(void *junk, int howto); 12617658Sjulian 12750107Smsmith/* register various local shutdown events */ 128110859Salfredstatic void 12950107Smsmithshutdown_conf(void *unused) 13050107Smsmith{ 131110859Salfred 132110859Salfred EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 133110859Salfred SHUTDOWN_PRI_FIRST); 134110859Salfred EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 135110859Salfred SHUTDOWN_PRI_LAST + 100); 136110859Salfred EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 137110859Salfred SHUTDOWN_PRI_LAST + 100); 138110859Salfred EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, 139110859Salfred SHUTDOWN_PRI_LAST + 200); 14050107Smsmith} 14148868Sphk 14250107SmsmithSYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 14350107Smsmith 14417658Sjulian/* 14517658Sjulian * The system call that results in a reboot 14682749Sdillon * 14782749Sdillon * MPSAFE 14817658Sjulian */ 14982749Sdillon/* ARGSUSED */ 15017658Sjulianint 15183366Sjulianreboot(struct thread *td, struct reboot_args *uap) 15217658Sjulian{ 15317658Sjulian int error; 15417658Sjulian 155106024Srwatson error = 0; 156106024Srwatson#ifdef MAC 157106024Srwatson error = mac_check_system_reboot(td->td_ucred, uap->opt); 158106024Srwatson#endif 159106024Srwatson if (error == 0) 160106024Srwatson error = suser(td); 161106024Srwatson if (error == 0) { 162106024Srwatson mtx_lock(&Giant); 16382749Sdillon boot(uap->opt); 164106024Srwatson mtx_unlock(&Giant); 165106024Srwatson } 16682749Sdillon return (error); 16717658Sjulian} 16817658Sjulian 16917658Sjulian/* 17017658Sjulian * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 17117658Sjulian */ 17265268Smsmithstatic int shutdown_howto = 0; 17365268Smsmith 17417658Sjulianvoid 17565268Smsmithshutdown_nice(int howto) 17617658Sjulian{ 177110859Salfred 17865268Smsmith shutdown_howto = howto; 179110859Salfred 18017658Sjulian /* Send a signal to init(8) and have it shutdown the world */ 18117658Sjulian if (initproc != NULL) { 18273913Sjhb PROC_LOCK(initproc); 18317658Sjulian psignal(initproc, SIGINT); 18473913Sjhb PROC_UNLOCK(initproc); 18517658Sjulian } else { 18617658Sjulian /* No init(8) running, so simply reboot */ 18717658Sjulian boot(RB_NOSYNC); 18817658Sjulian } 18917658Sjulian return; 19017658Sjulian} 19117658Sjulianstatic int waittime = -1; 19217658Sjulian 19354233Sphkstatic void 19465395Speterprint_uptime(void) 19554233Sphk{ 19654233Sphk int f; 19754233Sphk struct timespec ts; 19854233Sphk 19954233Sphk getnanouptime(&ts); 20054233Sphk printf("Uptime: "); 20154233Sphk f = 0; 20254233Sphk if (ts.tv_sec >= 86400) { 20365764Sjhb printf("%ldd", (long)ts.tv_sec / 86400); 20454233Sphk ts.tv_sec %= 86400; 20554233Sphk f = 1; 20654233Sphk } 20754233Sphk if (f || ts.tv_sec >= 3600) { 20865764Sjhb printf("%ldh", (long)ts.tv_sec / 3600); 20954233Sphk ts.tv_sec %= 3600; 21054233Sphk f = 1; 21154233Sphk } 21254233Sphk if (f || ts.tv_sec >= 60) { 21365764Sjhb printf("%ldm", (long)ts.tv_sec / 60); 21454233Sphk ts.tv_sec %= 60; 21554233Sphk f = 1; 21654233Sphk } 21765764Sjhb printf("%lds\n", (long)ts.tv_sec); 21854233Sphk} 21954233Sphk 22094169Sphkstatic void 22194169Sphkdoadump(void) 22294169Sphk{ 223110859Salfred 224132412Sjulian /* 225132412Sjulian * Sometimes people have to call this from the kernel debugger. 226132412Sjulian * (if 'panic' can not dump) 227132412Sjulian * Give them a clue as to why they can't dump. 228132412Sjulian */ 229132412Sjulian if (dumper.dumper == NULL) { 230132413Sjulian printf("Cannot dump. No dump device defined.\n"); 231132412Sjulian return; 232132412Sjulian } 233132412Sjulian 23494169Sphk savectx(&dumppcb); 235131927Smarcel dumptid = curthread->td_tid; 23694169Sphk dumping++; 23794169Sphk dumpsys(&dumper); 23894169Sphk} 23994169Sphk 24017658Sjulian/* 24117658Sjulian * Go through the rigmarole of shutting down.. 24217658Sjulian * this used to be in machdep.c but I'll be dammned if I could see 24317658Sjulian * anything machine dependant in it. 24417658Sjulian */ 24531275Sbdestatic void 24665395Speterboot(int howto) 24717658Sjulian{ 248133763Struckman static int first_buf_printf = 1; 24917658Sjulian 250137263Speter#ifdef SMP 251137263Speter /* Do all shutdown processing on cpu0 */ 252137263Speter mtx_lock_spin(&sched_lock); 253137263Speter sched_bind(curthread, 0); 254137263Speter mtx_unlock_spin(&sched_lock); 255137263Speter#endif 256137263Speter 25765268Smsmith /* collect extra flags that shutdown_nice might have set */ 25865268Smsmith howto |= shutdown_howto; 25965268Smsmith 26082119Sjhb /* We are out of the debugger now. */ 261131927Smarcel kdb_active = 0; 26282119Sjhb 26325164Speter#ifdef SMP 26465395Speter if (smp_active) 26570861Sjake printf("boot() called on cpu#%d\n", PCPU_GET(cpuid)); 26625164Speter#endif 26727997Sjulian /* 26827997Sjulian * Do any callouts that should be done BEFORE syncing the filesystems. 26927997Sjulian */ 27050107Smsmith EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 27127997Sjulian 27227997Sjulian /* 27327997Sjulian * Now sync filesystems 27427997Sjulian */ 27517658Sjulian if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 27617658Sjulian register struct buf *bp; 27765707Sjasone int iter, nbusy, pbusy; 278131481Sjhb#ifndef PREEMPTION 27965707Sjasone int subiter; 280131481Sjhb#endif 28117658Sjulian 28217658Sjulian waittime = 0; 28317658Sjulian 28490361Sjulian sync(&thread0, NULL); 28517658Sjulian 28634266Sjulian /* 28734266Sjulian * With soft updates, some buffers that are 28834266Sjulian * written will be remarked as dirty until other 28934266Sjulian * buffers are written. 29034266Sjulian */ 29165707Sjasone for (iter = pbusy = 0; iter < 20; iter++) { 29217658Sjulian nbusy = 0; 29317658Sjulian for (bp = &buf[nbuf]; --bp >= buf; ) { 29448225Smckusick if ((bp->b_flags & B_INVAL) == 0 && 29548225Smckusick BUF_REFCNT(bp) > 0) { 29617658Sjulian nbusy++; 29734266Sjulian } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 29834266Sjulian == B_DELWRI) { 29934266Sjulian /* bawrite(bp);*/ 30034266Sjulian nbusy++; 30117658Sjulian } 30217658Sjulian } 303133763Struckman if (nbusy == 0) { 304133763Struckman if (first_buf_printf) 305136115Sphk printf("All buffers synced."); 30617658Sjulian break; 307133763Struckman } 308133763Struckman if (first_buf_printf) { 309133763Struckman printf("Syncing disks, buffers remaining... "); 310133763Struckman first_buf_printf = 0; 311133763Struckman } 31217658Sjulian printf("%d ", nbusy); 31365707Sjasone if (nbusy < pbusy) 31465707Sjasone iter = 0; 31565707Sjasone pbusy = nbusy; 31690361Sjulian sync(&thread0, NULL); 317131481Sjhb 318131481Sjhb#ifdef PREEMPTION 319131481Sjhb /* 320131481Sjhb * Drop Giant and spin for a while to allow 321131481Sjhb * interrupt threads to run. 322131481Sjhb */ 323131481Sjhb DROP_GIANT(); 32434266Sjulian DELAY(50000 * iter); 325131481Sjhb PICKUP_GIANT(); 326131481Sjhb#else 327131481Sjhb /* 328131481Sjhb * Drop Giant and context switch several times to 329131481Sjhb * allow interrupt threads to run. 330131481Sjhb */ 331131481Sjhb DROP_GIANT(); 332131481Sjhb for (subiter = 0; subiter < 50 * iter; subiter++) { 333131481Sjhb mtx_lock_spin(&sched_lock); 334131481Sjhb mi_switch(SW_VOL, NULL); 335131481Sjhb mtx_unlock_spin(&sched_lock); 336131481Sjhb DELAY(1000); 337131481Sjhb } 338131481Sjhb PICKUP_GIANT(); 339131481Sjhb#endif 34017658Sjulian } 341133418Snjl printf("\n"); 34241137Smsmith /* 34341137Smsmith * Count only busy local buffers to prevent forcing 34441137Smsmith * a fsck if we're just a client of a wedged NFS server 34541137Smsmith */ 34641137Smsmith nbusy = 0; 34741137Smsmith for (bp = &buf[nbuf]; --bp >= buf; ) { 34848225Smckusick if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 34948225Smckusick ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 350137186Sphk#if 0 351137186Sphk/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */ 352130640Sphk if (bp->b_dev == NULL) { 35353452Sphk TAILQ_REMOVE(&mountlist, 35448225Smckusick bp->b_vp->v_mount, mnt_list); 35553023Sphk continue; 35653023Sphk } 357137186Sphk#endif 35853023Sphk nbusy++; 35953023Sphk#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 36053023Sphk printf( 361137186Sphk "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n", 362137186Sphk nbusy, bp->b_bufobj, 36353023Sphk bp->b_flags, (long)bp->b_blkno, 36453023Sphk (long)bp->b_lblkno); 36553023Sphk#endif 36646568Speter } 36741137Smsmith } 36817658Sjulian if (nbusy) { 36917658Sjulian /* 37017658Sjulian * Failed to sync all blocks. Indicate this and don't 37117658Sjulian * unmount filesystems (thus forcing an fsck on reboot). 37217658Sjulian */ 373133763Struckman printf("Giving up on %d buffers\n", nbusy); 37417658Sjulian DELAY(5000000); /* 5 seconds */ 37517658Sjulian } else { 376133763Struckman if (!first_buf_printf) 377133763Struckman printf("Final sync complete\n"); 37817658Sjulian /* 37917658Sjulian * Unmount filesystems 38017658Sjulian */ 38117658Sjulian if (panicstr == 0) 38217658Sjulian vfs_unmountall(); 38317658Sjulian } 38439237Sgibbs DELAY(100000); /* wait for console output to finish */ 38517658Sjulian } 38627997Sjulian 38754233Sphk print_uptime(); 38854233Sphk 38927997Sjulian /* 39027997Sjulian * Ok, now do things that assume all filesystem activity has 39127997Sjulian * been completed. 39227997Sjulian */ 39350107Smsmith EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 39439237Sgibbs splhigh(); 395132412Sjulian if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 39694169Sphk doadump(); 39739237Sgibbs 39839237Sgibbs /* Now that we're going to really halt the system... */ 39950107Smsmith EVENTHANDLER_INVOKE(shutdown_final, howto); 40039237Sgibbs 40150107Smsmith for(;;) ; /* safety against shutdown_reset not working */ 40250107Smsmith /* NOTREACHED */ 40350107Smsmith} 40450107Smsmith 40550107Smsmith/* 40650107Smsmith * If the shutdown was a clean halt, behave accordingly. 40750107Smsmith */ 40850107Smsmithstatic void 40950107Smsmithshutdown_halt(void *junk, int howto) 41050107Smsmith{ 411110859Salfred 41217658Sjulian if (howto & RB_HALT) { 41317658Sjulian printf("\n"); 41417658Sjulian printf("The operating system has halted.\n"); 41517658Sjulian printf("Please press any key to reboot.\n\n"); 41619274Sjulian switch (cngetc()) { 41719274Sjulian case -1: /* No console, just die */ 41819274Sjulian cpu_halt(); 41919274Sjulian /* NOTREACHED */ 42019274Sjulian default: 42139237Sgibbs howto &= ~RB_HALT; 42219274Sjulian break; 42319274Sjulian } 42450107Smsmith } 42550107Smsmith} 42617658Sjulian 42750107Smsmith/* 42850107Smsmith * Check to see if the system paniced, pause and then reboot 42950107Smsmith * according to the specified delay. 43050107Smsmith */ 43150107Smsmithstatic void 43250107Smsmithshutdown_panic(void *junk, int howto) 43350107Smsmith{ 43450107Smsmith int loop; 43550107Smsmith 43650107Smsmith if (howto & RB_DUMP) { 43739237Sgibbs if (PANIC_REBOOT_WAIT_TIME != 0) { 43839237Sgibbs if (PANIC_REBOOT_WAIT_TIME != -1) { 43939237Sgibbs printf("Automatic reboot in %d seconds - " 44039237Sgibbs "press a key on the console to abort\n", 44139237Sgibbs PANIC_REBOOT_WAIT_TIME); 44239237Sgibbs for (loop = PANIC_REBOOT_WAIT_TIME * 10; 44339237Sgibbs loop > 0; --loop) { 44439237Sgibbs DELAY(1000 * 100); /* 1/10th second */ 44539237Sgibbs /* Did user type a key? */ 44639237Sgibbs if (cncheckc() != -1) 44739237Sgibbs break; 44817658Sjulian } 44939237Sgibbs if (!loop) 45050107Smsmith return; 45117658Sjulian } 45239237Sgibbs } else { /* zero time specified - reboot NOW */ 45350107Smsmith return; 45417658Sjulian } 45589522Snik printf("--> Press a key on the console to reboot,\n"); 45689522Snik printf("--> or switch off the system now.\n"); 45739237Sgibbs cngetc(); 45817658Sjulian } 45950107Smsmith} 46050107Smsmith 46150107Smsmith/* 46250107Smsmith * Everything done, now reset 46350107Smsmith */ 46450107Smsmithstatic void 46550107Smsmithshutdown_reset(void *junk, int howto) 46650107Smsmith{ 467110859Salfred 46817658Sjulian printf("Rebooting...\n"); 46917658Sjulian DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 47017677Sjulian /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 47117658Sjulian cpu_reset(); 47250107Smsmith /* NOTREACHED */ /* assuming reset worked */ 47317658Sjulian} 47417658Sjulian 47575570Sjhb#ifdef SMP 476101155Sjhbstatic u_int panic_cpu = NOCPU; 47775570Sjhb#endif 47875570Sjhb 47917658Sjulian/* 48017658Sjulian * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 48117658Sjulian * and then reboots. If we are called twice, then we avoid trying to sync 48217658Sjulian * the disks as this often leads to recursive panics. 48382749Sdillon * 48482749Sdillon * MPSAFE 48517658Sjulian */ 48617658Sjulianvoid 487130164Sphkpanic(const char *fmt, ...) 48817658Sjulian{ 489100209Sgallatin struct thread *td = curthread; 490103647Sjhb int bootopt, newpanic; 49117658Sjulian va_list ap; 49238874Sache static char buf[256]; 49317658Sjulian 49465557Sjasone#ifdef SMP 49582115Sjhb /* 49682115Sjhb * We don't want multiple CPU's to panic at the same time, so we 497101155Sjhb * use panic_cpu as a simple spinlock. We have to keep checking 498101155Sjhb * panic_cpu if we are spinning in case the panic on the first 49982115Sjhb * CPU is canceled. 50082115Sjhb */ 501101155Sjhb if (panic_cpu != PCPU_GET(cpuid)) 502101155Sjhb while (atomic_cmpset_int(&panic_cpu, NOCPU, 503101155Sjhb PCPU_GET(cpuid)) == 0) 504101155Sjhb while (panic_cpu != NOCPU) 505101155Sjhb ; /* nothing */ 50665557Sjasone#endif 50765557Sjasone 50817658Sjulian bootopt = RB_AUTOBOOT | RB_DUMP; 509103647Sjhb newpanic = 0; 51017658Sjulian if (panicstr) 51117658Sjulian bootopt |= RB_NOSYNC; 512103647Sjhb else { 51317658Sjulian panicstr = fmt; 514103647Sjhb newpanic = 1; 515103647Sjhb } 51617658Sjulian 51717658Sjulian va_start(ap, fmt); 518116398Siedowse if (newpanic) { 519116398Siedowse (void)vsnprintf(buf, sizeof(buf), fmt, ap); 52038874Sache panicstr = buf; 521130164Sphk printf("panic: %s\n", buf); 522116398Siedowse } else { 523116398Siedowse printf("panic: "); 524116398Siedowse vprintf(fmt, ap); 525130164Sphk printf("\n"); 526116398Siedowse } 52717658Sjulian va_end(ap); 52826100Sfsmp#ifdef SMP 529134089Sjhb printf("cpuid = %d\n", PCPU_GET(cpuid)); 53026100Sfsmp#endif 53117658Sjulian 532131927Smarcel#ifdef KDB 533103647Sjhb if (newpanic && trace_on_panic) 534131927Smarcel kdb_backtrace(); 53517658Sjulian if (debugger_on_panic) 536131927Smarcel kdb_enter("panic"); 53782223Sjhb#ifdef RESTARTABLE_PANICS 53882115Sjhb /* See if the user aborted the panic, in which case we continue. */ 53982115Sjhb if (panicstr == NULL) { 54082115Sjhb#ifdef SMP 541101155Sjhb atomic_store_rel_int(&panic_cpu, NOCPU); 54217658Sjulian#endif 54382115Sjhb return; 54482115Sjhb } 54582115Sjhb#endif 54682223Sjhb#endif 547113633Sjhb mtx_lock_spin(&sched_lock); 548100209Sgallatin td->td_flags |= TDF_INPANIC; 549113633Sjhb mtx_unlock_spin(&sched_lock); 55085202Speter if (!sync_on_panic) 55185202Speter bootopt |= RB_NOSYNC; 55217658Sjulian boot(bootopt); 55317658Sjulian} 55417658Sjulian 55517768Sjulian/* 55643436Smsmith * Support for poweroff delay. 55743436Smsmith */ 55854248Smsmith#ifndef POWEROFF_DELAY 55954248Smsmith# define POWEROFF_DELAY 5000 56054248Smsmith#endif 56154248Smsmithstatic int poweroff_delay = POWEROFF_DELAY; 56254248Smsmith 56343436SmsmithSYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 56443436Smsmith &poweroff_delay, 0, ""); 56543436Smsmith 566110859Salfredstatic void 56750107Smsmithpoweroff_wait(void *junk, int howto) 56843436Smsmith{ 569110859Salfred 570110859Salfred if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 57143436Smsmith return; 57243436Smsmith DELAY(poweroff_delay * 1000); 57343436Smsmith} 57455539Sluoqi 57555539Sluoqi/* 57655539Sluoqi * Some system processes (e.g. syncer) need to be stopped at appropriate 57755539Sluoqi * points in their main loops prior to a system shutdown, so that they 57855539Sluoqi * won't interfere with the shutdown process (e.g. by holding a disk buf 57955539Sluoqi * to cause sync to fail). For each of these system processes, register 58055539Sluoqi * shutdown_kproc() as a handler for one of shutdown events. 58155539Sluoqi */ 58255539Sluoqistatic int kproc_shutdown_wait = 60; 58355539SluoqiSYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 58455539Sluoqi &kproc_shutdown_wait, 0, ""); 58555539Sluoqi 58655539Sluoqivoid 58770063Sjhbkproc_shutdown(void *arg, int howto) 58855539Sluoqi{ 58955539Sluoqi struct proc *p; 590132177Salfred char procname[MAXCOMLEN + 1]; 59155539Sluoqi int error; 59255539Sluoqi 59355539Sluoqi if (panicstr) 59455539Sluoqi return; 59555539Sluoqi 59655539Sluoqi p = (struct proc *)arg; 597132177Salfred strlcpy(procname, p->p_comm, sizeof(procname)); 598132866Snjl printf("Waiting (max %d seconds) for system process `%s' to stop...", 599132177Salfred kproc_shutdown_wait, procname); 60070063Sjhb error = kthread_suspend(p, kproc_shutdown_wait * hz); 60155539Sluoqi 60255539Sluoqi if (error == EWOULDBLOCK) 603132866Snjl printf("timed out\n"); 60455539Sluoqi else 605132866Snjl printf("done\n"); 60655539Sluoqi} 60793496Sphk 60893496Sphk/* Registration of dumpers */ 60993496Sphkint 61093496Sphkset_dumper(struct dumperinfo *di) 61193496Sphk{ 612110859Salfred 61393496Sphk if (di == NULL) { 61493496Sphk bzero(&dumper, sizeof dumper); 61593496Sphk return (0); 61693496Sphk } 61793496Sphk if (dumper.dumper != NULL) 61893496Sphk return (EBUSY); 61993496Sphk dumper = *di; 62093496Sphk return (0); 62193496Sphk} 62293496Sphk 623105531Stmm#if defined(__powerpc__) 62493496Sphkvoid 62593496Sphkdumpsys(struct dumperinfo *di __unused) 62693496Sphk{ 62793496Sphk 62893496Sphk printf("Kernel dumps not implemented on this architecture\n"); 62993496Sphk} 63093496Sphk#endif 631