kern_shutdown.c revision 138217
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 138217 2004-11-30 06:21:38Z njl $"); 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/* 241137329Snjl * Shutdown the system cleanly to prepare for reboot, halt, or power off. 24217658Sjulian */ 24331275Sbdestatic void 24465395Speterboot(int howto) 24517658Sjulian{ 246133763Struckman static int first_buf_printf = 1; 24717658Sjulian 248137375Smarcel#if defined(SMP) 249137329Snjl /* 250137329Snjl * Bind us to CPU 0 so that all shutdown code runs there. Some 251137329Snjl * systems don't shutdown properly (i.e., ACPI power off) if we 252137329Snjl * run on another processor. 253137329Snjl */ 254137263Speter mtx_lock_spin(&sched_lock); 255137263Speter sched_bind(curthread, 0); 256137263Speter mtx_unlock_spin(&sched_lock); 257138217Snjl KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0")); 258137263Speter#endif 259137263Speter 26065268Smsmith /* collect extra flags that shutdown_nice might have set */ 26165268Smsmith howto |= shutdown_howto; 26265268Smsmith 26382119Sjhb /* We are out of the debugger now. */ 264131927Smarcel kdb_active = 0; 26582119Sjhb 26627997Sjulian /* 26727997Sjulian * Do any callouts that should be done BEFORE syncing the filesystems. 26827997Sjulian */ 26950107Smsmith EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 27027997Sjulian 27127997Sjulian /* 27227997Sjulian * Now sync filesystems 27327997Sjulian */ 27417658Sjulian if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 27517658Sjulian register struct buf *bp; 27665707Sjasone int iter, nbusy, pbusy; 277131481Sjhb#ifndef PREEMPTION 27865707Sjasone int subiter; 279131481Sjhb#endif 28017658Sjulian 28117658Sjulian waittime = 0; 28217658Sjulian 28390361Sjulian sync(&thread0, NULL); 28417658Sjulian 28534266Sjulian /* 28634266Sjulian * With soft updates, some buffers that are 28734266Sjulian * written will be remarked as dirty until other 28834266Sjulian * buffers are written. 28934266Sjulian */ 29065707Sjasone for (iter = pbusy = 0; iter < 20; iter++) { 29117658Sjulian nbusy = 0; 29217658Sjulian for (bp = &buf[nbuf]; --bp >= buf; ) { 29348225Smckusick if ((bp->b_flags & B_INVAL) == 0 && 29448225Smckusick BUF_REFCNT(bp) > 0) { 29517658Sjulian nbusy++; 29634266Sjulian } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 29734266Sjulian == B_DELWRI) { 29834266Sjulian /* bawrite(bp);*/ 29934266Sjulian nbusy++; 30017658Sjulian } 30117658Sjulian } 302133763Struckman if (nbusy == 0) { 303133763Struckman if (first_buf_printf) 304136115Sphk printf("All buffers synced."); 30517658Sjulian break; 306133763Struckman } 307133763Struckman if (first_buf_printf) { 308133763Struckman printf("Syncing disks, buffers remaining... "); 309133763Struckman first_buf_printf = 0; 310133763Struckman } 31117658Sjulian printf("%d ", nbusy); 31265707Sjasone if (nbusy < pbusy) 31365707Sjasone iter = 0; 31465707Sjasone pbusy = nbusy; 31590361Sjulian sync(&thread0, NULL); 316131481Sjhb 317131481Sjhb#ifdef PREEMPTION 318131481Sjhb /* 319131481Sjhb * Drop Giant and spin for a while to allow 320131481Sjhb * interrupt threads to run. 321131481Sjhb */ 322131481Sjhb DROP_GIANT(); 32334266Sjulian DELAY(50000 * iter); 324131481Sjhb PICKUP_GIANT(); 325131481Sjhb#else 326131481Sjhb /* 327131481Sjhb * Drop Giant and context switch several times to 328131481Sjhb * allow interrupt threads to run. 329131481Sjhb */ 330131481Sjhb DROP_GIANT(); 331131481Sjhb for (subiter = 0; subiter < 50 * iter; subiter++) { 332131481Sjhb mtx_lock_spin(&sched_lock); 333131481Sjhb mi_switch(SW_VOL, NULL); 334131481Sjhb mtx_unlock_spin(&sched_lock); 335131481Sjhb DELAY(1000); 336131481Sjhb } 337131481Sjhb PICKUP_GIANT(); 338131481Sjhb#endif 33917658Sjulian } 340133418Snjl printf("\n"); 34141137Smsmith /* 34241137Smsmith * Count only busy local buffers to prevent forcing 34341137Smsmith * a fsck if we're just a client of a wedged NFS server 34441137Smsmith */ 34541137Smsmith nbusy = 0; 34641137Smsmith for (bp = &buf[nbuf]; --bp >= buf; ) { 34748225Smckusick if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 34848225Smckusick ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 349137186Sphk#if 0 350137186Sphk/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */ 351130640Sphk if (bp->b_dev == NULL) { 35253452Sphk TAILQ_REMOVE(&mountlist, 35348225Smckusick bp->b_vp->v_mount, mnt_list); 35453023Sphk continue; 35553023Sphk } 356137186Sphk#endif 35753023Sphk nbusy++; 35853023Sphk#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 35953023Sphk printf( 360137186Sphk "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n", 361137186Sphk nbusy, bp->b_bufobj, 36253023Sphk bp->b_flags, (long)bp->b_blkno, 36353023Sphk (long)bp->b_lblkno); 36453023Sphk#endif 36546568Speter } 36641137Smsmith } 36717658Sjulian if (nbusy) { 36817658Sjulian /* 36917658Sjulian * Failed to sync all blocks. Indicate this and don't 37017658Sjulian * unmount filesystems (thus forcing an fsck on reboot). 37117658Sjulian */ 372133763Struckman printf("Giving up on %d buffers\n", nbusy); 37317658Sjulian DELAY(5000000); /* 5 seconds */ 37417658Sjulian } else { 375133763Struckman if (!first_buf_printf) 376133763Struckman printf("Final sync complete\n"); 37717658Sjulian /* 37817658Sjulian * Unmount filesystems 37917658Sjulian */ 38017658Sjulian if (panicstr == 0) 38117658Sjulian vfs_unmountall(); 38217658Sjulian } 38339237Sgibbs DELAY(100000); /* wait for console output to finish */ 38417658Sjulian } 38527997Sjulian 38654233Sphk print_uptime(); 38754233Sphk 38827997Sjulian /* 38927997Sjulian * Ok, now do things that assume all filesystem activity has 39027997Sjulian * been completed. 39127997Sjulian */ 39250107Smsmith EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 393137329Snjl 394137329Snjl /* XXX This doesn't disable interrupts any more. Reconsider? */ 39539237Sgibbs splhigh(); 396137329Snjl 397132412Sjulian if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 39894169Sphk doadump(); 39939237Sgibbs 40039237Sgibbs /* Now that we're going to really halt the system... */ 40150107Smsmith EVENTHANDLER_INVOKE(shutdown_final, howto); 40239237Sgibbs 40350107Smsmith for(;;) ; /* safety against shutdown_reset not working */ 40450107Smsmith /* NOTREACHED */ 40550107Smsmith} 40650107Smsmith 40750107Smsmith/* 40850107Smsmith * If the shutdown was a clean halt, behave accordingly. 40950107Smsmith */ 41050107Smsmithstatic void 41150107Smsmithshutdown_halt(void *junk, int howto) 41250107Smsmith{ 413110859Salfred 41417658Sjulian if (howto & RB_HALT) { 41517658Sjulian printf("\n"); 41617658Sjulian printf("The operating system has halted.\n"); 41717658Sjulian printf("Please press any key to reboot.\n\n"); 41819274Sjulian switch (cngetc()) { 41919274Sjulian case -1: /* No console, just die */ 42019274Sjulian cpu_halt(); 42119274Sjulian /* NOTREACHED */ 42219274Sjulian default: 42339237Sgibbs howto &= ~RB_HALT; 42419274Sjulian break; 42519274Sjulian } 42650107Smsmith } 42750107Smsmith} 42817658Sjulian 42950107Smsmith/* 43050107Smsmith * Check to see if the system paniced, pause and then reboot 43150107Smsmith * according to the specified delay. 43250107Smsmith */ 43350107Smsmithstatic void 43450107Smsmithshutdown_panic(void *junk, int howto) 43550107Smsmith{ 43650107Smsmith int loop; 43750107Smsmith 43850107Smsmith if (howto & RB_DUMP) { 43939237Sgibbs if (PANIC_REBOOT_WAIT_TIME != 0) { 44039237Sgibbs if (PANIC_REBOOT_WAIT_TIME != -1) { 44139237Sgibbs printf("Automatic reboot in %d seconds - " 44239237Sgibbs "press a key on the console to abort\n", 44339237Sgibbs PANIC_REBOOT_WAIT_TIME); 44439237Sgibbs for (loop = PANIC_REBOOT_WAIT_TIME * 10; 44539237Sgibbs loop > 0; --loop) { 44639237Sgibbs DELAY(1000 * 100); /* 1/10th second */ 44739237Sgibbs /* Did user type a key? */ 44839237Sgibbs if (cncheckc() != -1) 44939237Sgibbs break; 45017658Sjulian } 45139237Sgibbs if (!loop) 45250107Smsmith return; 45317658Sjulian } 45439237Sgibbs } else { /* zero time specified - reboot NOW */ 45550107Smsmith return; 45617658Sjulian } 45789522Snik printf("--> Press a key on the console to reboot,\n"); 45889522Snik printf("--> or switch off the system now.\n"); 45939237Sgibbs cngetc(); 46017658Sjulian } 46150107Smsmith} 46250107Smsmith 46350107Smsmith/* 46450107Smsmith * Everything done, now reset 46550107Smsmith */ 46650107Smsmithstatic void 46750107Smsmithshutdown_reset(void *junk, int howto) 46850107Smsmith{ 469110859Salfred 47017658Sjulian printf("Rebooting...\n"); 47117658Sjulian DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 47217677Sjulian /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 47317658Sjulian cpu_reset(); 47450107Smsmith /* NOTREACHED */ /* assuming reset worked */ 47517658Sjulian} 47617658Sjulian 47775570Sjhb#ifdef SMP 478101155Sjhbstatic u_int panic_cpu = NOCPU; 47975570Sjhb#endif 48075570Sjhb 48117658Sjulian/* 48217658Sjulian * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 48317658Sjulian * and then reboots. If we are called twice, then we avoid trying to sync 48417658Sjulian * the disks as this often leads to recursive panics. 48582749Sdillon * 48682749Sdillon * MPSAFE 48717658Sjulian */ 48817658Sjulianvoid 489130164Sphkpanic(const char *fmt, ...) 49017658Sjulian{ 491100209Sgallatin struct thread *td = curthread; 492103647Sjhb int bootopt, newpanic; 49317658Sjulian va_list ap; 49438874Sache static char buf[256]; 49517658Sjulian 49665557Sjasone#ifdef SMP 49782115Sjhb /* 49882115Sjhb * We don't want multiple CPU's to panic at the same time, so we 499101155Sjhb * use panic_cpu as a simple spinlock. We have to keep checking 500101155Sjhb * panic_cpu if we are spinning in case the panic on the first 50182115Sjhb * CPU is canceled. 50282115Sjhb */ 503101155Sjhb if (panic_cpu != PCPU_GET(cpuid)) 504101155Sjhb while (atomic_cmpset_int(&panic_cpu, NOCPU, 505101155Sjhb PCPU_GET(cpuid)) == 0) 506101155Sjhb while (panic_cpu != NOCPU) 507101155Sjhb ; /* nothing */ 50865557Sjasone#endif 50965557Sjasone 51017658Sjulian bootopt = RB_AUTOBOOT | RB_DUMP; 511103647Sjhb newpanic = 0; 51217658Sjulian if (panicstr) 51317658Sjulian bootopt |= RB_NOSYNC; 514103647Sjhb else { 51517658Sjulian panicstr = fmt; 516103647Sjhb newpanic = 1; 517103647Sjhb } 51817658Sjulian 51917658Sjulian va_start(ap, fmt); 520116398Siedowse if (newpanic) { 521116398Siedowse (void)vsnprintf(buf, sizeof(buf), fmt, ap); 52238874Sache panicstr = buf; 523130164Sphk printf("panic: %s\n", buf); 524116398Siedowse } else { 525116398Siedowse printf("panic: "); 526116398Siedowse vprintf(fmt, ap); 527130164Sphk printf("\n"); 528116398Siedowse } 52917658Sjulian va_end(ap); 53026100Sfsmp#ifdef SMP 531134089Sjhb printf("cpuid = %d\n", PCPU_GET(cpuid)); 53226100Sfsmp#endif 53317658Sjulian 534131927Smarcel#ifdef KDB 535103647Sjhb if (newpanic && trace_on_panic) 536131927Smarcel kdb_backtrace(); 53717658Sjulian if (debugger_on_panic) 538131927Smarcel kdb_enter("panic"); 53982223Sjhb#ifdef RESTARTABLE_PANICS 54082115Sjhb /* See if the user aborted the panic, in which case we continue. */ 54182115Sjhb if (panicstr == NULL) { 54282115Sjhb#ifdef SMP 543101155Sjhb atomic_store_rel_int(&panic_cpu, NOCPU); 54417658Sjulian#endif 54582115Sjhb return; 54682115Sjhb } 54782115Sjhb#endif 54882223Sjhb#endif 549113633Sjhb mtx_lock_spin(&sched_lock); 550100209Sgallatin td->td_flags |= TDF_INPANIC; 551113633Sjhb mtx_unlock_spin(&sched_lock); 55285202Speter if (!sync_on_panic) 55385202Speter bootopt |= RB_NOSYNC; 55417658Sjulian boot(bootopt); 55517658Sjulian} 55617658Sjulian 55717768Sjulian/* 55843436Smsmith * Support for poweroff delay. 55943436Smsmith */ 56054248Smsmith#ifndef POWEROFF_DELAY 56154248Smsmith# define POWEROFF_DELAY 5000 56254248Smsmith#endif 56354248Smsmithstatic int poweroff_delay = POWEROFF_DELAY; 56454248Smsmith 56543436SmsmithSYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 56643436Smsmith &poweroff_delay, 0, ""); 56743436Smsmith 568110859Salfredstatic void 56950107Smsmithpoweroff_wait(void *junk, int howto) 57043436Smsmith{ 571110859Salfred 572110859Salfred if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 57343436Smsmith return; 57443436Smsmith DELAY(poweroff_delay * 1000); 57543436Smsmith} 57655539Sluoqi 57755539Sluoqi/* 57855539Sluoqi * Some system processes (e.g. syncer) need to be stopped at appropriate 57955539Sluoqi * points in their main loops prior to a system shutdown, so that they 58055539Sluoqi * won't interfere with the shutdown process (e.g. by holding a disk buf 58155539Sluoqi * to cause sync to fail). For each of these system processes, register 58255539Sluoqi * shutdown_kproc() as a handler for one of shutdown events. 58355539Sluoqi */ 58455539Sluoqistatic int kproc_shutdown_wait = 60; 58555539SluoqiSYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 58655539Sluoqi &kproc_shutdown_wait, 0, ""); 58755539Sluoqi 58855539Sluoqivoid 58970063Sjhbkproc_shutdown(void *arg, int howto) 59055539Sluoqi{ 59155539Sluoqi struct proc *p; 592132177Salfred char procname[MAXCOMLEN + 1]; 59355539Sluoqi int error; 59455539Sluoqi 59555539Sluoqi if (panicstr) 59655539Sluoqi return; 59755539Sluoqi 59855539Sluoqi p = (struct proc *)arg; 599132177Salfred strlcpy(procname, p->p_comm, sizeof(procname)); 600132866Snjl printf("Waiting (max %d seconds) for system process `%s' to stop...", 601132177Salfred kproc_shutdown_wait, procname); 60270063Sjhb error = kthread_suspend(p, kproc_shutdown_wait * hz); 60355539Sluoqi 60455539Sluoqi if (error == EWOULDBLOCK) 605132866Snjl printf("timed out\n"); 60655539Sluoqi else 607132866Snjl printf("done\n"); 60855539Sluoqi} 60993496Sphk 61093496Sphk/* Registration of dumpers */ 61193496Sphkint 61293496Sphkset_dumper(struct dumperinfo *di) 61393496Sphk{ 614110859Salfred 61593496Sphk if (di == NULL) { 61693496Sphk bzero(&dumper, sizeof dumper); 61793496Sphk return (0); 61893496Sphk } 61993496Sphk if (dumper.dumper != NULL) 62093496Sphk return (EBUSY); 62193496Sphk dumper = *di; 62293496Sphk return (0); 62393496Sphk} 62493496Sphk 625105531Stmm#if defined(__powerpc__) 62693496Sphkvoid 62793496Sphkdumpsys(struct dumperinfo *di __unused) 62893496Sphk{ 62993496Sphk 63093496Sphk printf("Kernel dumps not implemented on this architecture\n"); 63193496Sphk} 63293496Sphk#endif 633