kern_shutdown.c revision 83703
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 83703 2001-09-20 06:08:53Z peter $ 4017658Sjulian */ 4117658Sjulian 4217658Sjulian#include "opt_ddb.h" 4333445Seivind#include "opt_hw_wdog.h" 4428976Sbde#include "opt_panic.h" 4528976Sbde#include "opt_show_busybufs.h" 4617658Sjulian 4717658Sjulian#include <sys/param.h> 4817658Sjulian#include <sys/systm.h> 4960041Sphk#include <sys/bio.h> 5031275Sbde#include <sys/buf.h> 5178767Sjhb#include <sys/conf.h> 5278767Sjhb#include <sys/cons.h> 5381688Sbde#include <sys/disklabel.h> 5478767Sjhb#include <sys/eventhandler.h> 5517658Sjulian#include <sys/kernel.h> 5655539Sluoqi#include <sys/kthread.h> 5721776Sbde#include <sys/mount.h> 5878767Sjhb#include <sys/proc.h> 5978767Sjhb#include <sys/reboot.h> 6078767Sjhb#include <sys/resourcevar.h> 6178767Sjhb#include <sys/smp.h> /* smp_active */ 6217658Sjulian#include <sys/sysctl.h> 6317658Sjulian#include <sys/sysproto.h> 6478767Sjhb#include <sys/vnode.h> 6517658Sjulian 6617658Sjulian#include <machine/pcb.h> 6717658Sjulian#include <machine/md_var.h> 6817658Sjulian 6917658Sjulian#include <sys/signalvar.h> 7082119Sjhb#ifdef DDB 7182119Sjhb#include <ddb/ddb.h> 7282119Sjhb#endif 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 8428769Sbde#ifdef DDB 8517658Sjulian#ifdef DDB_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"); 9217658Sjulian#endif 9317658Sjulian 9443436SmsmithSYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 9543436Smsmith 9628000Sjulian#ifdef HW_WDOG 9717658Sjulian/* 9827997Sjulian * If there is a hardware watchdog, point this at the function needed to 9927997Sjulian * hold it off. 10027997Sjulian * It's needed when the kernel needs to do some lengthy operations. 10127997Sjulian * e.g. in wd.c when dumping core.. It's most annoying to have 10227997Sjulian * your precious core-dump only half written because the wdog kicked in. 10327997Sjulian */ 10427997Sjulianwatchdog_tickle_fn wdog_tickler = NULL; 10528000Sjulian#endif /* HW_WDOG */ 10627997Sjulian 10727997Sjulian/* 10817658Sjulian * Variable panicstr contains argument to first call to panic; used as flag 10917658Sjulian * to indicate that the kernel has already called panic. 11017658Sjulian */ 11117658Sjulianconst char *panicstr; 11217658Sjulian 11367093Spsint dumping; /* system is dumping */ 11467093Sps 11565395Speterstatic void boot(int) __dead2; 11665395Speterstatic void dumpsys(void); 11765395Speterstatic void poweroff_wait(void *, int); 11865395Speterstatic void shutdown_halt(void *junk, int howto); 11965395Speterstatic void shutdown_panic(void *junk, int howto); 12065395Speterstatic void shutdown_reset(void *junk, int howto); 12117658Sjulian 12250107Smsmith/* register various local shutdown events */ 12350107Smsmithstatic void 12450107Smsmithshutdown_conf(void *unused) 12550107Smsmith{ 12650107Smsmith EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 12750107Smsmith EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 12850107Smsmith EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 12950107Smsmith EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 13050107Smsmith} 13148868Sphk 13250107SmsmithSYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 13350107Smsmith 13417658Sjulian/* 13517658Sjulian * The system call that results in a reboot 13682749Sdillon * 13782749Sdillon * MPSAFE 13817658Sjulian */ 13982749Sdillon/* ARGSUSED */ 14017658Sjulianint 14183366Sjulianreboot(struct thread *td, struct reboot_args *uap) 14217658Sjulian{ 14317658Sjulian int error; 14417658Sjulian 14582749Sdillon mtx_lock(&Giant); 14683366Sjulian if ((error = suser_td(td)) == 0) 14782749Sdillon boot(uap->opt); 14882749Sdillon mtx_unlock(&Giant); 14982749Sdillon return (error); 15017658Sjulian} 15117658Sjulian 15217658Sjulian/* 15317658Sjulian * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 15417658Sjulian */ 15565268Smsmithstatic int shutdown_howto = 0; 15665268Smsmith 15717658Sjulianvoid 15865268Smsmithshutdown_nice(int howto) 15917658Sjulian{ 16065268Smsmith shutdown_howto = howto; 16165268Smsmith 16217658Sjulian /* Send a signal to init(8) and have it shutdown the world */ 16317658Sjulian if (initproc != NULL) { 16473913Sjhb PROC_LOCK(initproc); 16517658Sjulian psignal(initproc, SIGINT); 16673913Sjhb PROC_UNLOCK(initproc); 16717658Sjulian } else { 16817658Sjulian /* No init(8) running, so simply reboot */ 16917658Sjulian boot(RB_NOSYNC); 17017658Sjulian } 17117658Sjulian return; 17217658Sjulian} 17317658Sjulianstatic int waittime = -1; 17417658Sjulianstatic struct pcb dumppcb; 17517658Sjulian 17654233Sphkstatic void 17765395Speterprint_uptime(void) 17854233Sphk{ 17954233Sphk int f; 18054233Sphk struct timespec ts; 18154233Sphk 18254233Sphk getnanouptime(&ts); 18354233Sphk printf("Uptime: "); 18454233Sphk f = 0; 18554233Sphk if (ts.tv_sec >= 86400) { 18665764Sjhb printf("%ldd", (long)ts.tv_sec / 86400); 18754233Sphk ts.tv_sec %= 86400; 18854233Sphk f = 1; 18954233Sphk } 19054233Sphk if (f || ts.tv_sec >= 3600) { 19165764Sjhb printf("%ldh", (long)ts.tv_sec / 3600); 19254233Sphk ts.tv_sec %= 3600; 19354233Sphk f = 1; 19454233Sphk } 19554233Sphk if (f || ts.tv_sec >= 60) { 19665764Sjhb printf("%ldm", (long)ts.tv_sec / 60); 19754233Sphk ts.tv_sec %= 60; 19854233Sphk f = 1; 19954233Sphk } 20065764Sjhb printf("%lds\n", (long)ts.tv_sec); 20154233Sphk} 20254233Sphk 20317658Sjulian/* 20417658Sjulian * Go through the rigmarole of shutting down.. 20517658Sjulian * this used to be in machdep.c but I'll be dammned if I could see 20617658Sjulian * anything machine dependant in it. 20717658Sjulian */ 20831275Sbdestatic void 20965395Speterboot(int howto) 21017658Sjulian{ 21117658Sjulian 21265268Smsmith /* collect extra flags that shutdown_nice might have set */ 21365268Smsmith howto |= shutdown_howto; 21465268Smsmith 21582119Sjhb#ifdef DDB 21682119Sjhb /* We are out of the debugger now. */ 21782119Sjhb db_active = 0; 21882119Sjhb#endif 21982119Sjhb 22025164Speter#ifdef SMP 22165395Speter if (smp_active) 22270861Sjake printf("boot() called on cpu#%d\n", PCPU_GET(cpuid)); 22325164Speter#endif 22427997Sjulian /* 22527997Sjulian * Do any callouts that should be done BEFORE syncing the filesystems. 22627997Sjulian */ 22750107Smsmith EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 22827997Sjulian 22927997Sjulian /* 23027997Sjulian * Now sync filesystems 23127997Sjulian */ 23217658Sjulian if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 23317658Sjulian register struct buf *bp; 23465707Sjasone int iter, nbusy, pbusy; 23565707Sjasone int subiter; 23617658Sjulian 23717658Sjulian waittime = 0; 23817658Sjulian printf("\nsyncing disks... "); 23917658Sjulian 24083366Sjulian sync(thread0, NULL); 24117658Sjulian 24234266Sjulian /* 24334266Sjulian * With soft updates, some buffers that are 24434266Sjulian * written will be remarked as dirty until other 24534266Sjulian * buffers are written. 24634266Sjulian */ 24765707Sjasone for (iter = pbusy = 0; iter < 20; iter++) { 24817658Sjulian nbusy = 0; 24917658Sjulian for (bp = &buf[nbuf]; --bp >= buf; ) { 25048225Smckusick if ((bp->b_flags & B_INVAL) == 0 && 25148225Smckusick BUF_REFCNT(bp) > 0) { 25217658Sjulian nbusy++; 25334266Sjulian } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 25434266Sjulian == B_DELWRI) { 25534266Sjulian /* bawrite(bp);*/ 25634266Sjulian nbusy++; 25717658Sjulian } 25817658Sjulian } 25917658Sjulian if (nbusy == 0) 26017658Sjulian break; 26117658Sjulian printf("%d ", nbusy); 26265707Sjasone if (nbusy < pbusy) 26365707Sjasone iter = 0; 26465707Sjasone pbusy = nbusy; 26583366Sjulian sync(thread0, NULL); 26683366Sjulian if (curthread != NULL) { 26768808Sjhb DROP_GIANT_NOSWITCH(); 26865707Sjasone for (subiter = 0; subiter < 50 * iter; subiter++) { 26972200Sbmilekic mtx_lock_spin(&sched_lock); 27083366Sjulian setrunqueue(curthread); 27183366Sjulian curthread->td_proc->p_stats->p_ru.ru_nvcsw++; 27265707Sjasone mi_switch(); /* Allow interrupt threads to run */ 27372200Sbmilekic mtx_unlock_spin(&sched_lock); 27465707Sjasone DELAY(1000); 27565707Sjasone } 27668808Sjhb PICKUP_GIANT(); 27765707Sjasone } else 27834266Sjulian DELAY(50000 * iter); 27917658Sjulian } 28053023Sphk printf("\n"); 28141137Smsmith /* 28241137Smsmith * Count only busy local buffers to prevent forcing 28341137Smsmith * a fsck if we're just a client of a wedged NFS server 28441137Smsmith */ 28541137Smsmith nbusy = 0; 28641137Smsmith for (bp = &buf[nbuf]; --bp >= buf; ) { 28748225Smckusick if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 28848225Smckusick ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 28953023Sphk if (bp->b_dev == NODEV) { 29053452Sphk TAILQ_REMOVE(&mountlist, 29148225Smckusick bp->b_vp->v_mount, mnt_list); 29253023Sphk continue; 29353023Sphk } 29453023Sphk nbusy++; 29553023Sphk#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 29653023Sphk printf( 29753023Sphk "%d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n", 29853023Sphk nbusy, devtoname(bp->b_dev), 29953023Sphk bp->b_flags, (long)bp->b_blkno, 30053023Sphk (long)bp->b_lblkno); 30153023Sphk#endif 30246568Speter } 30341137Smsmith } 30417658Sjulian if (nbusy) { 30517658Sjulian /* 30617658Sjulian * Failed to sync all blocks. Indicate this and don't 30717658Sjulian * unmount filesystems (thus forcing an fsck on reboot). 30817658Sjulian */ 30953023Sphk printf("giving up on %d buffers\n", nbusy); 31017658Sjulian DELAY(5000000); /* 5 seconds */ 31117658Sjulian } else { 31217658Sjulian printf("done\n"); 31317658Sjulian /* 31417658Sjulian * Unmount filesystems 31517658Sjulian */ 31617658Sjulian if (panicstr == 0) 31717658Sjulian vfs_unmountall(); 31817658Sjulian } 31939237Sgibbs DELAY(100000); /* wait for console output to finish */ 32017658Sjulian } 32127997Sjulian 32254233Sphk print_uptime(); 32354233Sphk 32427997Sjulian /* 32527997Sjulian * Ok, now do things that assume all filesystem activity has 32627997Sjulian * been completed. 32727997Sjulian */ 32850107Smsmith EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 32939237Sgibbs splhigh(); 33065394Speter if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) 33139237Sgibbs dumpsys(); 33239237Sgibbs 33339237Sgibbs /* Now that we're going to really halt the system... */ 33450107Smsmith EVENTHANDLER_INVOKE(shutdown_final, howto); 33539237Sgibbs 33650107Smsmith for(;;) ; /* safety against shutdown_reset not working */ 33750107Smsmith /* NOTREACHED */ 33850107Smsmith} 33950107Smsmith 34050107Smsmith/* 34150107Smsmith * If the shutdown was a clean halt, behave accordingly. 34250107Smsmith */ 34350107Smsmithstatic void 34450107Smsmithshutdown_halt(void *junk, int howto) 34550107Smsmith{ 34617658Sjulian if (howto & RB_HALT) { 34717658Sjulian printf("\n"); 34817658Sjulian printf("The operating system has halted.\n"); 34917658Sjulian printf("Please press any key to reboot.\n\n"); 35019274Sjulian switch (cngetc()) { 35119274Sjulian case -1: /* No console, just die */ 35219274Sjulian cpu_halt(); 35319274Sjulian /* NOTREACHED */ 35419274Sjulian default: 35539237Sgibbs howto &= ~RB_HALT; 35619274Sjulian break; 35719274Sjulian } 35850107Smsmith } 35950107Smsmith} 36017658Sjulian 36150107Smsmith/* 36250107Smsmith * Check to see if the system paniced, pause and then reboot 36350107Smsmith * according to the specified delay. 36450107Smsmith */ 36550107Smsmithstatic void 36650107Smsmithshutdown_panic(void *junk, int howto) 36750107Smsmith{ 36850107Smsmith int loop; 36950107Smsmith 37050107Smsmith if (howto & RB_DUMP) { 37139237Sgibbs if (PANIC_REBOOT_WAIT_TIME != 0) { 37239237Sgibbs if (PANIC_REBOOT_WAIT_TIME != -1) { 37339237Sgibbs printf("Automatic reboot in %d seconds - " 37439237Sgibbs "press a key on the console to abort\n", 37539237Sgibbs PANIC_REBOOT_WAIT_TIME); 37639237Sgibbs for (loop = PANIC_REBOOT_WAIT_TIME * 10; 37739237Sgibbs loop > 0; --loop) { 37839237Sgibbs DELAY(1000 * 100); /* 1/10th second */ 37939237Sgibbs /* Did user type a key? */ 38039237Sgibbs if (cncheckc() != -1) 38139237Sgibbs break; 38217658Sjulian } 38339237Sgibbs if (!loop) 38450107Smsmith return; 38517658Sjulian } 38639237Sgibbs } else { /* zero time specified - reboot NOW */ 38750107Smsmith return; 38817658Sjulian } 38939237Sgibbs printf("--> Press a key on the console to reboot <--\n"); 39039237Sgibbs cngetc(); 39117658Sjulian } 39250107Smsmith} 39350107Smsmith 39450107Smsmith/* 39550107Smsmith * Everything done, now reset 39650107Smsmith */ 39750107Smsmithstatic void 39850107Smsmithshutdown_reset(void *junk, int howto) 39950107Smsmith{ 40017658Sjulian printf("Rebooting...\n"); 40117658Sjulian DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 40217677Sjulian /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 40317658Sjulian cpu_reset(); 40450107Smsmith /* NOTREACHED */ /* assuming reset worked */ 40517658Sjulian} 40617658Sjulian 40717658Sjulian/* 40817658Sjulian * Magic number for savecore 40917658Sjulian * 41017658Sjulian * exported (symorder) and used at least by savecore(8) 41117658Sjulian * 41217658Sjulian */ 41317658Sjulianstatic u_long const dumpmag = 0x8fca0101UL; 41417658Sjulian 41517658Sjulianstatic int dumpsize = 0; /* also for savecore */ 41617658Sjulian 41717658Sjulianstatic int dodump = 1; 41817658Sjulian 41948868SphkSYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 42048868Sphk "Try to perform coredump on kernel panic"); 42148868Sphk 42248868Sphkstatic int 42365395Spetersetdumpdev(dev_t dev) 42448868Sphk{ 42550571Sphk int psize; 42648868Sphk long newdumplo; 42748868Sphk 42848868Sphk if (dev == NODEV) { 42948868Sphk dumpdev = dev; 43048868Sphk return (0); 43148868Sphk } 43249679Sphk if (devsw(dev) == NULL) 43348868Sphk return (ENXIO); /* XXX is this right? */ 43449679Sphk if (devsw(dev)->d_psize == NULL) 43548868Sphk return (ENXIO); /* XXX should be ENODEV ? */ 43649679Sphk psize = devsw(dev)->d_psize(dev); 43748868Sphk if (psize == -1) 43848868Sphk return (ENXIO); /* XXX should be ENODEV ? */ 43948868Sphk /* 44050571Sphk * XXX should clean up checking in dumpsys() to be more like this. 44148868Sphk */ 44281688Sbde newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE); 44381688Sbde if (newdumplo <= LABELSECTOR) 44448868Sphk return (ENOSPC); 44548868Sphk dumpdev = dev; 44648868Sphk dumplo = newdumplo; 44748868Sphk return (0); 44848868Sphk} 44948868Sphk 45048868Sphk 45131403Sjulian/* ARGSUSED */ 45231403Sjulianstatic void 45365395Speterdump_conf(void *dummy) 45431403Sjulian{ 45548868Sphk if (setdumpdev(dumpdev) != 0) 45648868Sphk dumpdev = NODEV; 45731403Sjulian} 45848868Sphk 45931403SjulianSYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 46031403Sjulian 46148868Sphkstatic int 46262573Sphksysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 46348868Sphk{ 46448868Sphk int error; 46548868Sphk udev_t ndumpdev; 46648868Sphk 46753838Sphk ndumpdev = dev2udev(dumpdev); 46848868Sphk error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 46948868Sphk if (error == 0 && req->newptr != NULL) 47053838Sphk error = setdumpdev(udev2dev(ndumpdev, 0)); 47148868Sphk return (error); 47248868Sphk} 47348868Sphk 47448868SphkSYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 47548868Sphk 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); 47648868Sphk 47717658Sjulian/* 47817658Sjulian * Doadump comes here after turning off memory management and 47917658Sjulian * getting on the dump stack, either when called above, or by 48017658Sjulian * the auto-restart code. 48117658Sjulian */ 48217658Sjulianstatic void 48317658Sjuliandumpsys(void) 48417658Sjulian{ 48549627Salfred int error; 48617658Sjulian 48765394Speter savectx(&dumppcb); 48817658Sjulian if (!dodump) 48917658Sjulian return; 49017658Sjulian if (dumpdev == NODEV) 49117658Sjulian return; 49249679Sphk if (!(devsw(dumpdev))) 49317658Sjulian return; 49449679Sphk if (!(devsw(dumpdev)->d_dump)) 49517658Sjulian return; 49683703Speter if (dumping++) { 49783703Speter dumping--; 49883703Speter printf("Dump already in progress, bailing...\n"); 49983703Speter return; 50083703Speter } 50117658Sjulian dumpsize = Maxmem; 50250571Sphk printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 50317658Sjulian printf("dump "); 50449679Sphk error = (*devsw(dumpdev)->d_dump)(dumpdev); 50583703Speter dumping--; 50649627Salfred if (error == 0) { 50749627Salfred printf("succeeded\n"); 50849627Salfred return; 50949627Salfred } 51049627Salfred printf("failed, reason: "); 51149627Salfred switch (error) { 51249627Salfred case ENODEV: 51349627Salfred printf("device doesn't support a dump routine\n"); 51449627Salfred break; 51517658Sjulian 51617658Sjulian case ENXIO: 51717658Sjulian printf("device bad\n"); 51817658Sjulian break; 51917658Sjulian 52017658Sjulian case EFAULT: 52117658Sjulian printf("device not ready\n"); 52217658Sjulian break; 52317658Sjulian 52417658Sjulian case EINVAL: 52517658Sjulian printf("area improper\n"); 52617658Sjulian break; 52717658Sjulian 52817658Sjulian case EIO: 52917658Sjulian printf("i/o error\n"); 53017658Sjulian break; 53117658Sjulian 53217658Sjulian case EINTR: 53317658Sjulian printf("aborted from console\n"); 53417658Sjulian break; 53517658Sjulian 53617658Sjulian default: 53749627Salfred printf("unknown, error = %d\n", error); 53817658Sjulian break; 53917658Sjulian } 54017658Sjulian} 54117658Sjulian 54274890Spsint 54374890Spsdumpstatus(vm_offset_t addr, long count) 54474890Sps{ 54574890Sps int c; 54674890Sps 54774890Sps if (addr % (1024 * 1024) == 0) { 54874890Sps#ifdef HW_WDOG 54974890Sps if (wdog_tickler) 55074890Sps (*wdog_tickler)(); 55174890Sps#endif 55274890Sps printf("%ld ", count / (1024 * 1024)); 55374890Sps } 55474890Sps 55574890Sps if ((c = cncheckc()) == 0x03) 55674890Sps return -1; 55774890Sps else if (c != -1) 55874890Sps printf("[CTRL-C to abort] "); 55974890Sps 56074890Sps return 0; 56174890Sps} 56274890Sps 56375570Sjhb#ifdef SMP 56475570Sjhbstatic u_int panic_cpu = NOCPU; 56575570Sjhb#endif 56675570Sjhb 56717658Sjulian/* 56817658Sjulian * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 56917658Sjulian * and then reboots. If we are called twice, then we avoid trying to sync 57017658Sjulian * the disks as this often leads to recursive panics. 57182749Sdillon * 57282749Sdillon * MPSAFE 57317658Sjulian */ 57417658Sjulianvoid 57517658Sjulianpanic(const char *fmt, ...) 57617658Sjulian{ 57783312Sjhb int bootopt; 57817658Sjulian va_list ap; 57938874Sache static char buf[256]; 58017658Sjulian 58165557Sjasone#ifdef SMP 58282115Sjhb /* 58382115Sjhb * We don't want multiple CPU's to panic at the same time, so we 58482115Sjhb * use panic_cpu as a simple spinlock. We have to keep checking 58582115Sjhb * panic_cpu if we are spinning in case the panic on the first 58682115Sjhb * CPU is canceled. 58782115Sjhb */ 58883312Sjhb if (panic_cpu != PCPU_GET(cpuid)) 58982115Sjhb while (atomic_cmpset_int(&panic_cpu, NOCPU, 59083312Sjhb PCPU_GET(cpuid)) == 0) 59182115Sjhb while (panic_cpu != NOCPU) 59282115Sjhb ; /* nothing */ 59365557Sjasone#endif 59465557Sjasone 59517658Sjulian bootopt = RB_AUTOBOOT | RB_DUMP; 59617658Sjulian if (panicstr) 59717658Sjulian bootopt |= RB_NOSYNC; 59817658Sjulian else 59917658Sjulian panicstr = fmt; 60017658Sjulian 60117658Sjulian va_start(ap, fmt); 60241514Sarchie (void)vsnprintf(buf, sizeof(buf), fmt, ap); 60338874Sache if (panicstr == fmt) 60438874Sache panicstr = buf; 60517658Sjulian va_end(ap); 60638874Sache printf("panic: %s\n", buf); 60726100Sfsmp#ifdef SMP 60872091Sasmodai /* two separate prints in case of an unmapped page and trap */ 60970861Sjake printf("cpuid = %d; ", PCPU_GET(cpuid)); 61069335Sjhb#ifdef APIC_IO 61129128Speter printf("lapic.id = %08x\n", lapic.id); 61226100Sfsmp#endif 61369335Sjhb#endif 61417658Sjulian 61517658Sjulian#if defined(DDB) 61617658Sjulian if (debugger_on_panic) 61717658Sjulian Debugger ("panic"); 61882223Sjhb#ifdef RESTARTABLE_PANICS 61982115Sjhb /* See if the user aborted the panic, in which case we continue. */ 62082115Sjhb if (panicstr == NULL) { 62182115Sjhb#ifdef SMP 62282115Sjhb atomic_store_rel_int(&panic_cpu, NOCPU); 62317658Sjulian#endif 62482115Sjhb return; 62582115Sjhb } 62682115Sjhb#endif 62782223Sjhb#endif 62817658Sjulian boot(bootopt); 62917658Sjulian} 63017658Sjulian 63117768Sjulian/* 63243436Smsmith * Support for poweroff delay. 63343436Smsmith */ 63454248Smsmith#ifndef POWEROFF_DELAY 63554248Smsmith# define POWEROFF_DELAY 5000 63654248Smsmith#endif 63754248Smsmithstatic int poweroff_delay = POWEROFF_DELAY; 63854248Smsmith 63943436SmsmithSYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 64043436Smsmith &poweroff_delay, 0, ""); 64143436Smsmith 64250107Smsmithstatic void 64350107Smsmithpoweroff_wait(void *junk, int howto) 64443436Smsmith{ 64543436Smsmith if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 64643436Smsmith return; 64743436Smsmith DELAY(poweroff_delay * 1000); 64843436Smsmith} 64955539Sluoqi 65055539Sluoqi/* 65155539Sluoqi * Some system processes (e.g. syncer) need to be stopped at appropriate 65255539Sluoqi * points in their main loops prior to a system shutdown, so that they 65355539Sluoqi * won't interfere with the shutdown process (e.g. by holding a disk buf 65455539Sluoqi * to cause sync to fail). For each of these system processes, register 65555539Sluoqi * shutdown_kproc() as a handler for one of shutdown events. 65655539Sluoqi */ 65755539Sluoqistatic int kproc_shutdown_wait = 60; 65855539SluoqiSYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 65955539Sluoqi &kproc_shutdown_wait, 0, ""); 66055539Sluoqi 66155539Sluoqivoid 66270063Sjhbkproc_shutdown(void *arg, int howto) 66355539Sluoqi{ 66455539Sluoqi struct proc *p; 66555539Sluoqi int error; 66655539Sluoqi 66755539Sluoqi if (panicstr) 66855539Sluoqi return; 66955539Sluoqi 67055539Sluoqi p = (struct proc *)arg; 67155539Sluoqi printf("Waiting (max %d seconds) for system process `%s' to stop...", 67255862Sluoqi kproc_shutdown_wait, p->p_comm); 67370063Sjhb error = kthread_suspend(p, kproc_shutdown_wait * hz); 67455539Sluoqi 67555539Sluoqi if (error == EWOULDBLOCK) 67655539Sluoqi printf("timed out\n"); 67755539Sluoqi else 67855539Sluoqi printf("stopped\n"); 67955539Sluoqi} 680