kern_shutdown.c revision 131927
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 131927 2004-07-10 21:36:01Z marcel $"); 39116182Sobrien 40131927Smarcel#include "opt_kdb.h" 4133445Seivind#include "opt_hw_wdog.h" 42106024Srwatson#include "opt_mac.h" 4328976Sbde#include "opt_panic.h" 4428976Sbde#include "opt_show_busybufs.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> 6278767Sjhb#include <sys/smp.h> /* smp_active */ 6317658Sjulian#include <sys/sysctl.h> 6417658Sjulian#include <sys/sysproto.h> 6578767Sjhb#include <sys/vnode.h> 6617658Sjulian 67118990Smarcel#include <machine/cpu.h> 6894169Sphk#include <machine/pcb.h> 6991778Sjake#include <machine/smp.h> 7017658Sjulian 7117658Sjulian#include <sys/signalvar.h> 7217658Sjulian 7317658Sjulian#ifndef PANIC_REBOOT_WAIT_TIME 7417658Sjulian#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 7517658Sjulian#endif 7617658Sjulian 7717658Sjulian/* 7817658Sjulian * Note that stdarg.h and the ANSI style va_start macro is used for both 7917658Sjulian * ANSI and traditional C compilers. 8017658Sjulian */ 8117658Sjulian#include <machine/stdarg.h> 8217658Sjulian 83131927Smarcel#ifdef KDB 84131927Smarcel#ifdef KDB_UNATTENDED 8542135Smsmithint debugger_on_panic = 0; 8617658Sjulian#else 8742135Smsmithint debugger_on_panic = 1; 8817658Sjulian#endif 8917658SjulianSYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 9046381Sbillf &debugger_on_panic, 0, "Run debugger on kernel panic"); 91103647Sjhb 92131927Smarcel#ifdef KDB_TRACE 93103647Sjhbint trace_on_panic = 1; 94103647Sjhb#else 95103647Sjhbint trace_on_panic = 0; 9617658Sjulian#endif 97103647SjhbSYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW, 98103647Sjhb &trace_on_panic, 0, "Print stack trace on kernel panic"); 99131927Smarcel#endif /* KDB */ 10017658Sjulian 10185202Speterint sync_on_panic = 1; 10285202SpeterSYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW, 10385202Speter &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 10485202Speter 10543436SmsmithSYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 10643436Smsmith 10728000Sjulian#ifdef HW_WDOG 10817658Sjulian/* 10927997Sjulian * If there is a hardware watchdog, point this at the function needed to 11027997Sjulian * hold it off. 11127997Sjulian * It's needed when the kernel needs to do some lengthy operations. 11227997Sjulian * e.g. in wd.c when dumping core.. It's most annoying to have 11327997Sjulian * your precious core-dump only half written because the wdog kicked in. 11427997Sjulian */ 11527997Sjulianwatchdog_tickle_fn wdog_tickler = NULL; 11628000Sjulian#endif /* HW_WDOG */ 11727997Sjulian 11827997Sjulian/* 11917658Sjulian * Variable panicstr contains argument to first call to panic; used as flag 12017658Sjulian * to indicate that the kernel has already called panic. 12117658Sjulian */ 12217658Sjulianconst char *panicstr; 12317658Sjulian 12493496Sphkint dumping; /* system is dumping */ 12593496Sphkstatic struct dumperinfo dumper; /* our selected dumper */ 12667093Sps 127131927Smarcel/* Context information for dump-debuggers. */ 128131927Smarcelstatic struct pcb dumppcb; /* Registers. */ 129131927Smarcelstatic lwpid_t dumptid; /* Thread ID. */ 130131927Smarcel 13165395Speterstatic void boot(int) __dead2; 13265395Speterstatic void poweroff_wait(void *, int); 13365395Speterstatic void shutdown_halt(void *junk, int howto); 13465395Speterstatic void shutdown_panic(void *junk, int howto); 13565395Speterstatic void shutdown_reset(void *junk, int howto); 13617658Sjulian 13750107Smsmith/* register various local shutdown events */ 138110859Salfredstatic void 13950107Smsmithshutdown_conf(void *unused) 14050107Smsmith{ 141110859Salfred 142110859Salfred EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 143110859Salfred SHUTDOWN_PRI_FIRST); 144110859Salfred EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 145110859Salfred SHUTDOWN_PRI_LAST + 100); 146110859Salfred EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 147110859Salfred SHUTDOWN_PRI_LAST + 100); 148110859Salfred EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, 149110859Salfred SHUTDOWN_PRI_LAST + 200); 15050107Smsmith} 15148868Sphk 15250107SmsmithSYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 15350107Smsmith 15417658Sjulian/* 15517658Sjulian * The system call that results in a reboot 15682749Sdillon * 15782749Sdillon * MPSAFE 15817658Sjulian */ 15982749Sdillon/* ARGSUSED */ 16017658Sjulianint 16183366Sjulianreboot(struct thread *td, struct reboot_args *uap) 16217658Sjulian{ 16317658Sjulian int error; 16417658Sjulian 165106024Srwatson error = 0; 166106024Srwatson#ifdef MAC 167106024Srwatson error = mac_check_system_reboot(td->td_ucred, uap->opt); 168106024Srwatson#endif 169106024Srwatson if (error == 0) 170106024Srwatson error = suser(td); 171106024Srwatson if (error == 0) { 172106024Srwatson mtx_lock(&Giant); 17382749Sdillon boot(uap->opt); 174106024Srwatson mtx_unlock(&Giant); 175106024Srwatson } 17682749Sdillon return (error); 17717658Sjulian} 17817658Sjulian 17917658Sjulian/* 18017658Sjulian * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 18117658Sjulian */ 18265268Smsmithstatic int shutdown_howto = 0; 18365268Smsmith 18417658Sjulianvoid 18565268Smsmithshutdown_nice(int howto) 18617658Sjulian{ 187110859Salfred 18865268Smsmith shutdown_howto = howto; 189110859Salfred 19017658Sjulian /* Send a signal to init(8) and have it shutdown the world */ 19117658Sjulian if (initproc != NULL) { 19273913Sjhb PROC_LOCK(initproc); 19317658Sjulian psignal(initproc, SIGINT); 19473913Sjhb PROC_UNLOCK(initproc); 19517658Sjulian } else { 19617658Sjulian /* No init(8) running, so simply reboot */ 19717658Sjulian boot(RB_NOSYNC); 19817658Sjulian } 19917658Sjulian return; 20017658Sjulian} 20117658Sjulianstatic int waittime = -1; 20217658Sjulian 20354233Sphkstatic void 20465395Speterprint_uptime(void) 20554233Sphk{ 20654233Sphk int f; 20754233Sphk struct timespec ts; 20854233Sphk 20954233Sphk getnanouptime(&ts); 21054233Sphk printf("Uptime: "); 21154233Sphk f = 0; 21254233Sphk if (ts.tv_sec >= 86400) { 21365764Sjhb printf("%ldd", (long)ts.tv_sec / 86400); 21454233Sphk ts.tv_sec %= 86400; 21554233Sphk f = 1; 21654233Sphk } 21754233Sphk if (f || ts.tv_sec >= 3600) { 21865764Sjhb printf("%ldh", (long)ts.tv_sec / 3600); 21954233Sphk ts.tv_sec %= 3600; 22054233Sphk f = 1; 22154233Sphk } 22254233Sphk if (f || ts.tv_sec >= 60) { 22365764Sjhb printf("%ldm", (long)ts.tv_sec / 60); 22454233Sphk ts.tv_sec %= 60; 22554233Sphk f = 1; 22654233Sphk } 22765764Sjhb printf("%lds\n", (long)ts.tv_sec); 22854233Sphk} 22954233Sphk 23094169Sphkstatic void 23194169Sphkdoadump(void) 23294169Sphk{ 233110859Salfred 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{ 24817658Sjulian 24965268Smsmith /* collect extra flags that shutdown_nice might have set */ 25065268Smsmith howto |= shutdown_howto; 25165268Smsmith 25282119Sjhb /* We are out of the debugger now. */ 253131927Smarcel kdb_active = 0; 25482119Sjhb 25525164Speter#ifdef SMP 25665395Speter if (smp_active) 25770861Sjake printf("boot() called on cpu#%d\n", PCPU_GET(cpuid)); 25825164Speter#endif 25927997Sjulian /* 26027997Sjulian * Do any callouts that should be done BEFORE syncing the filesystems. 26127997Sjulian */ 26250107Smsmith EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 26327997Sjulian 26427997Sjulian /* 26527997Sjulian * Now sync filesystems 26627997Sjulian */ 26717658Sjulian if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 26817658Sjulian register struct buf *bp; 26965707Sjasone int iter, nbusy, pbusy; 270131481Sjhb#ifndef PREEMPTION 27165707Sjasone int subiter; 272131481Sjhb#endif 27317658Sjulian 27417658Sjulian waittime = 0; 275107036Salfred printf("\nsyncing disks, buffers remaining... "); 27617658Sjulian 27790361Sjulian sync(&thread0, NULL); 27817658Sjulian 27934266Sjulian /* 28034266Sjulian * With soft updates, some buffers that are 28134266Sjulian * written will be remarked as dirty until other 28234266Sjulian * buffers are written. 28334266Sjulian */ 28465707Sjasone for (iter = pbusy = 0; iter < 20; iter++) { 28517658Sjulian nbusy = 0; 28617658Sjulian for (bp = &buf[nbuf]; --bp >= buf; ) { 28748225Smckusick if ((bp->b_flags & B_INVAL) == 0 && 28848225Smckusick BUF_REFCNT(bp) > 0) { 28917658Sjulian nbusy++; 29034266Sjulian } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 29134266Sjulian == B_DELWRI) { 29234266Sjulian /* bawrite(bp);*/ 29334266Sjulian nbusy++; 29417658Sjulian } 29517658Sjulian } 29617658Sjulian if (nbusy == 0) 29717658Sjulian break; 29817658Sjulian printf("%d ", nbusy); 29965707Sjasone if (nbusy < pbusy) 30065707Sjasone iter = 0; 30165707Sjasone pbusy = nbusy; 30290361Sjulian sync(&thread0, NULL); 303131481Sjhb 304131481Sjhb#ifdef PREEMPTION 305131481Sjhb /* 306131481Sjhb * Drop Giant and spin for a while to allow 307131481Sjhb * interrupt threads to run. 308131481Sjhb */ 309131481Sjhb DROP_GIANT(); 31034266Sjulian DELAY(50000 * iter); 311131481Sjhb PICKUP_GIANT(); 312131481Sjhb#else 313131481Sjhb /* 314131481Sjhb * Drop Giant and context switch several times to 315131481Sjhb * allow interrupt threads to run. 316131481Sjhb */ 317131481Sjhb DROP_GIANT(); 318131481Sjhb for (subiter = 0; subiter < 50 * iter; subiter++) { 319131481Sjhb mtx_lock_spin(&sched_lock); 320131481Sjhb mi_switch(SW_VOL, NULL); 321131481Sjhb mtx_unlock_spin(&sched_lock); 322131481Sjhb DELAY(1000); 323131481Sjhb } 324131481Sjhb PICKUP_GIANT(); 325131481Sjhb#endif 32617658Sjulian } 32753023Sphk printf("\n"); 32841137Smsmith /* 32941137Smsmith * Count only busy local buffers to prevent forcing 33041137Smsmith * a fsck if we're just a client of a wedged NFS server 33141137Smsmith */ 33241137Smsmith nbusy = 0; 33341137Smsmith for (bp = &buf[nbuf]; --bp >= buf; ) { 33448225Smckusick if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 33548225Smckusick ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 336130640Sphk if (bp->b_dev == NULL) { 33753452Sphk TAILQ_REMOVE(&mountlist, 33848225Smckusick bp->b_vp->v_mount, mnt_list); 33953023Sphk continue; 34053023Sphk } 34153023Sphk nbusy++; 34253023Sphk#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 34353023Sphk printf( 344110585Sjeff "%d: dev:%s, flags:%0x, blkno:%ld, lblkno:%ld\n", 34553023Sphk nbusy, devtoname(bp->b_dev), 34653023Sphk bp->b_flags, (long)bp->b_blkno, 34753023Sphk (long)bp->b_lblkno); 34853023Sphk#endif 34946568Speter } 35041137Smsmith } 35117658Sjulian if (nbusy) { 35217658Sjulian /* 35317658Sjulian * Failed to sync all blocks. Indicate this and don't 35417658Sjulian * unmount filesystems (thus forcing an fsck on reboot). 35517658Sjulian */ 35653023Sphk printf("giving up on %d buffers\n", nbusy); 35717658Sjulian DELAY(5000000); /* 5 seconds */ 35817658Sjulian } else { 35917658Sjulian printf("done\n"); 36017658Sjulian /* 36117658Sjulian * Unmount filesystems 36217658Sjulian */ 36317658Sjulian if (panicstr == 0) 36417658Sjulian vfs_unmountall(); 36517658Sjulian } 36639237Sgibbs DELAY(100000); /* wait for console output to finish */ 36717658Sjulian } 36827997Sjulian 36954233Sphk print_uptime(); 37054233Sphk 37127997Sjulian /* 37227997Sjulian * Ok, now do things that assume all filesystem activity has 37327997Sjulian * been completed. 37427997Sjulian */ 37550107Smsmith EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 37639237Sgibbs splhigh(); 37793496Sphk if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && 37894169Sphk !cold && dumper.dumper != NULL && !dumping) 37994169Sphk doadump(); 38039237Sgibbs 38139237Sgibbs /* Now that we're going to really halt the system... */ 38250107Smsmith EVENTHANDLER_INVOKE(shutdown_final, howto); 38339237Sgibbs 38450107Smsmith for(;;) ; /* safety against shutdown_reset not working */ 38550107Smsmith /* NOTREACHED */ 38650107Smsmith} 38750107Smsmith 38850107Smsmith/* 38950107Smsmith * If the shutdown was a clean halt, behave accordingly. 39050107Smsmith */ 39150107Smsmithstatic void 39250107Smsmithshutdown_halt(void *junk, int howto) 39350107Smsmith{ 394110859Salfred 39517658Sjulian if (howto & RB_HALT) { 39617658Sjulian printf("\n"); 39717658Sjulian printf("The operating system has halted.\n"); 39817658Sjulian printf("Please press any key to reboot.\n\n"); 39919274Sjulian switch (cngetc()) { 40019274Sjulian case -1: /* No console, just die */ 40119274Sjulian cpu_halt(); 40219274Sjulian /* NOTREACHED */ 40319274Sjulian default: 40439237Sgibbs howto &= ~RB_HALT; 40519274Sjulian break; 40619274Sjulian } 40750107Smsmith } 40850107Smsmith} 40917658Sjulian 41050107Smsmith/* 41150107Smsmith * Check to see if the system paniced, pause and then reboot 41250107Smsmith * according to the specified delay. 41350107Smsmith */ 41450107Smsmithstatic void 41550107Smsmithshutdown_panic(void *junk, int howto) 41650107Smsmith{ 41750107Smsmith int loop; 41850107Smsmith 41950107Smsmith if (howto & RB_DUMP) { 42039237Sgibbs if (PANIC_REBOOT_WAIT_TIME != 0) { 42139237Sgibbs if (PANIC_REBOOT_WAIT_TIME != -1) { 42239237Sgibbs printf("Automatic reboot in %d seconds - " 42339237Sgibbs "press a key on the console to abort\n", 42439237Sgibbs PANIC_REBOOT_WAIT_TIME); 42539237Sgibbs for (loop = PANIC_REBOOT_WAIT_TIME * 10; 42639237Sgibbs loop > 0; --loop) { 42739237Sgibbs DELAY(1000 * 100); /* 1/10th second */ 42839237Sgibbs /* Did user type a key? */ 42939237Sgibbs if (cncheckc() != -1) 43039237Sgibbs break; 43117658Sjulian } 43239237Sgibbs if (!loop) 43350107Smsmith return; 43417658Sjulian } 43539237Sgibbs } else { /* zero time specified - reboot NOW */ 43650107Smsmith return; 43717658Sjulian } 43889522Snik printf("--> Press a key on the console to reboot,\n"); 43989522Snik printf("--> or switch off the system now.\n"); 44039237Sgibbs cngetc(); 44117658Sjulian } 44250107Smsmith} 44350107Smsmith 44450107Smsmith/* 44550107Smsmith * Everything done, now reset 44650107Smsmith */ 44750107Smsmithstatic void 44850107Smsmithshutdown_reset(void *junk, int howto) 44950107Smsmith{ 450110859Salfred 45117658Sjulian printf("Rebooting...\n"); 45217658Sjulian DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 45317677Sjulian /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 45417658Sjulian cpu_reset(); 45550107Smsmith /* NOTREACHED */ /* assuming reset worked */ 45617658Sjulian} 45717658Sjulian 45875570Sjhb#ifdef SMP 459101155Sjhbstatic u_int panic_cpu = NOCPU; 46075570Sjhb#endif 46175570Sjhb 46217658Sjulian/* 46317658Sjulian * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 46417658Sjulian * and then reboots. If we are called twice, then we avoid trying to sync 46517658Sjulian * the disks as this often leads to recursive panics. 46682749Sdillon * 46782749Sdillon * MPSAFE 46817658Sjulian */ 46917658Sjulianvoid 470130164Sphkpanic(const char *fmt, ...) 47117658Sjulian{ 472100209Sgallatin struct thread *td = curthread; 473103647Sjhb int bootopt, newpanic; 47417658Sjulian va_list ap; 47538874Sache static char buf[256]; 47617658Sjulian 47765557Sjasone#ifdef SMP 47882115Sjhb /* 47982115Sjhb * We don't want multiple CPU's to panic at the same time, so we 480101155Sjhb * use panic_cpu as a simple spinlock. We have to keep checking 481101155Sjhb * panic_cpu if we are spinning in case the panic on the first 48282115Sjhb * CPU is canceled. 48382115Sjhb */ 484101155Sjhb if (panic_cpu != PCPU_GET(cpuid)) 485101155Sjhb while (atomic_cmpset_int(&panic_cpu, NOCPU, 486101155Sjhb PCPU_GET(cpuid)) == 0) 487101155Sjhb while (panic_cpu != NOCPU) 488101155Sjhb ; /* nothing */ 48965557Sjasone#endif 49065557Sjasone 49117658Sjulian bootopt = RB_AUTOBOOT | RB_DUMP; 492103647Sjhb newpanic = 0; 49317658Sjulian if (panicstr) 49417658Sjulian bootopt |= RB_NOSYNC; 495103647Sjhb else { 49617658Sjulian panicstr = fmt; 497103647Sjhb newpanic = 1; 498103647Sjhb } 49917658Sjulian 50017658Sjulian va_start(ap, fmt); 501116398Siedowse if (newpanic) { 502116398Siedowse (void)vsnprintf(buf, sizeof(buf), fmt, ap); 50338874Sache panicstr = buf; 504130164Sphk printf("panic: %s\n", buf); 505116398Siedowse } else { 506116398Siedowse printf("panic: "); 507116398Siedowse vprintf(fmt, ap); 508130164Sphk printf("\n"); 509116398Siedowse } 51017658Sjulian va_end(ap); 51126100Sfsmp#ifdef SMP 51272091Sasmodai /* two separate prints in case of an unmapped page and trap */ 51370861Sjake printf("cpuid = %d; ", PCPU_GET(cpuid)); 51469335Sjhb#ifdef APIC_IO 51529128Speter printf("lapic.id = %08x\n", lapic.id); 51699828Sjhb#else 51799828Sjhb printf("\n"); 51826100Sfsmp#endif 51969335Sjhb#endif 52017658Sjulian 521131927Smarcel#ifdef KDB 522103647Sjhb if (newpanic && trace_on_panic) 523131927Smarcel kdb_backtrace(); 52417658Sjulian if (debugger_on_panic) 525131927Smarcel kdb_enter("panic"); 52682223Sjhb#ifdef RESTARTABLE_PANICS 52782115Sjhb /* See if the user aborted the panic, in which case we continue. */ 52882115Sjhb if (panicstr == NULL) { 52982115Sjhb#ifdef SMP 530101155Sjhb atomic_store_rel_int(&panic_cpu, NOCPU); 53117658Sjulian#endif 53282115Sjhb return; 53382115Sjhb } 53482115Sjhb#endif 53582223Sjhb#endif 536113633Sjhb mtx_lock_spin(&sched_lock); 537100209Sgallatin td->td_flags |= TDF_INPANIC; 538113633Sjhb mtx_unlock_spin(&sched_lock); 53985202Speter if (!sync_on_panic) 54085202Speter bootopt |= RB_NOSYNC; 54117658Sjulian boot(bootopt); 54217658Sjulian} 54317658Sjulian 54417768Sjulian/* 54543436Smsmith * Support for poweroff delay. 54643436Smsmith */ 54754248Smsmith#ifndef POWEROFF_DELAY 54854248Smsmith# define POWEROFF_DELAY 5000 54954248Smsmith#endif 55054248Smsmithstatic int poweroff_delay = POWEROFF_DELAY; 55154248Smsmith 55243436SmsmithSYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 55343436Smsmith &poweroff_delay, 0, ""); 55443436Smsmith 555110859Salfredstatic void 55650107Smsmithpoweroff_wait(void *junk, int howto) 55743436Smsmith{ 558110859Salfred 559110859Salfred if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 56043436Smsmith return; 56143436Smsmith DELAY(poweroff_delay * 1000); 56243436Smsmith} 56355539Sluoqi 56455539Sluoqi/* 56555539Sluoqi * Some system processes (e.g. syncer) need to be stopped at appropriate 56655539Sluoqi * points in their main loops prior to a system shutdown, so that they 56755539Sluoqi * won't interfere with the shutdown process (e.g. by holding a disk buf 56855539Sluoqi * to cause sync to fail). For each of these system processes, register 56955539Sluoqi * shutdown_kproc() as a handler for one of shutdown events. 57055539Sluoqi */ 57155539Sluoqistatic int kproc_shutdown_wait = 60; 57255539SluoqiSYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 57355539Sluoqi &kproc_shutdown_wait, 0, ""); 57455539Sluoqi 57555539Sluoqivoid 57670063Sjhbkproc_shutdown(void *arg, int howto) 57755539Sluoqi{ 57855539Sluoqi struct proc *p; 57955539Sluoqi int error; 58055539Sluoqi 58155539Sluoqi if (panicstr) 58255539Sluoqi return; 58355539Sluoqi 58455539Sluoqi p = (struct proc *)arg; 58555539Sluoqi printf("Waiting (max %d seconds) for system process `%s' to stop...", 58655862Sluoqi kproc_shutdown_wait, p->p_comm); 58770063Sjhb error = kthread_suspend(p, kproc_shutdown_wait * hz); 58855539Sluoqi 58955539Sluoqi if (error == EWOULDBLOCK) 59055539Sluoqi printf("timed out\n"); 59155539Sluoqi else 59255539Sluoqi printf("stopped\n"); 59355539Sluoqi} 59493496Sphk 59593496Sphk/* Registration of dumpers */ 59693496Sphkint 59793496Sphkset_dumper(struct dumperinfo *di) 59893496Sphk{ 599110859Salfred 60093496Sphk if (di == NULL) { 60193496Sphk bzero(&dumper, sizeof dumper); 60293496Sphk return (0); 60393496Sphk } 60493496Sphk if (dumper.dumper != NULL) 60593496Sphk return (EBUSY); 60693496Sphk dumper = *di; 60793496Sphk return (0); 60893496Sphk} 60993496Sphk 610105531Stmm#if defined(__powerpc__) 61193496Sphkvoid 61293496Sphkdumpsys(struct dumperinfo *di __unused) 61393496Sphk{ 61493496Sphk 61593496Sphk printf("Kernel dumps not implemented on this architecture\n"); 61693496Sphk} 61793496Sphk#endif 618