kern_shutdown.c revision 228449
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 228449 2011-12-13 00:38:50Z eadler $"); 39116182Sobrien 40174921Srwatson#include "opt_ddb.h" 41131927Smarcel#include "opt_kdb.h" 4228976Sbde#include "opt_panic.h" 43134649Sscottl#include "opt_sched.h" 44221173Sattilio#include "opt_watchdog.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> 53193066Sjamie#include <sys/jail.h> 54131927Smarcel#include <sys/kdb.h> 5517658Sjulian#include <sys/kernel.h> 56183527Speter#include <sys/kerneldump.h> 5755539Sluoqi#include <sys/kthread.h> 5889601Ssobomax#include <sys/malloc.h> 5921776Sbde#include <sys/mount.h> 60164033Srwatson#include <sys/priv.h> 6178767Sjhb#include <sys/proc.h> 6278767Sjhb#include <sys/reboot.h> 6378767Sjhb#include <sys/resourcevar.h> 64137263Speter#include <sys/sched.h> 65206878Sattilio#include <sys/smp.h> 6617658Sjulian#include <sys/sysctl.h> 6717658Sjulian#include <sys/sysproto.h> 68225448Sattilio#include <sys/vnode.h> 69221173Sattilio#ifdef SW_WATCHDOG 70221173Sattilio#include <sys/watchdog.h> 71221173Sattilio#endif 7217658Sjulian 73174921Srwatson#include <ddb/ddb.h> 74174921Srwatson 75118990Smarcel#include <machine/cpu.h> 7694169Sphk#include <machine/pcb.h> 7791778Sjake#include <machine/smp.h> 7817658Sjulian 79163606Srwatson#include <security/mac/mac_framework.h> 80163606Srwatson 81157628Spjd#include <vm/vm.h> 82157628Spjd#include <vm/vm_object.h> 83157628Spjd#include <vm/vm_page.h> 84157628Spjd#include <vm/vm_pager.h> 85157628Spjd#include <vm/swap_pager.h> 86157628Spjd 8717658Sjulian#include <sys/signalvar.h> 8817658Sjulian 8917658Sjulian#ifndef PANIC_REBOOT_WAIT_TIME 9017658Sjulian#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 9117658Sjulian#endif 9217658Sjulian 9317658Sjulian/* 9417658Sjulian * Note that stdarg.h and the ANSI style va_start macro is used for both 9517658Sjulian * ANSI and traditional C compilers. 9617658Sjulian */ 9717658Sjulian#include <machine/stdarg.h> 9817658Sjulian 99131927Smarcel#ifdef KDB 100131927Smarcel#ifdef KDB_UNATTENDED 10142135Smsmithint debugger_on_panic = 0; 10217658Sjulian#else 10342135Smsmithint debugger_on_panic = 1; 10417658Sjulian#endif 105213322SavgSYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 10646381Sbillf &debugger_on_panic, 0, "Run debugger on kernel panic"); 107213322SavgTUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic); 108103647Sjhb 109131927Smarcel#ifdef KDB_TRACE 110213322Savgstatic int trace_on_panic = 1; 111103647Sjhb#else 112213322Savgstatic int trace_on_panic = 0; 11317658Sjulian#endif 114213322SavgSYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 115103647Sjhb &trace_on_panic, 0, "Print stack trace on kernel panic"); 116213322SavgTUNABLE_INT("debug.trace_on_panic", &trace_on_panic); 117131927Smarcel#endif /* KDB */ 11817658Sjulian 119213322Savgstatic int sync_on_panic = 0; 120213322SavgSYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 12185202Speter &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 122213322SavgTUNABLE_INT("kern.sync_on_panic", &sync_on_panic); 12385202Speter 124228424Savgstatic int stop_scheduler_on_panic = 0; 125228424SavgSYSCTL_INT(_kern, OID_AUTO, stop_scheduler_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 126228424Savg &stop_scheduler_on_panic, 0, "stop scheduler upon entering panic"); 127228424SavgTUNABLE_INT("kern.stop_scheduler_on_panic", &stop_scheduler_on_panic); 128228424Savg 129227309Sedstatic SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, 130227309Sed "Shutdown environment"); 13143436Smsmith 132225448Sattilio#ifndef DIAGNOSTIC 133225448Sattiliostatic int show_busybufs; 134225448Sattilio#else 135225448Sattiliostatic int show_busybufs = 1; 136225448Sattilio#endif 137225448SattilioSYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW, 138225448Sattilio &show_busybufs, 0, ""); 139225448Sattilio 14017658Sjulian/* 14117658Sjulian * Variable panicstr contains argument to first call to panic; used as flag 14217658Sjulian * to indicate that the kernel has already called panic. 14317658Sjulian */ 14417658Sjulianconst char *panicstr; 14517658Sjulian 146228424Savgint stop_scheduler; /* system stopped CPUs for panic */ 14793496Sphkint dumping; /* system is dumping */ 148155383Sjeffint rebooting; /* system is rebooting */ 14993496Sphkstatic struct dumperinfo dumper; /* our selected dumper */ 15067093Sps 151131927Smarcel/* Context information for dump-debuggers. */ 152131927Smarcelstatic struct pcb dumppcb; /* Registers. */ 153131927Smarcelstatic lwpid_t dumptid; /* Thread ID. */ 154131927Smarcel 15565395Speterstatic void poweroff_wait(void *, int); 15665395Speterstatic void shutdown_halt(void *junk, int howto); 15765395Speterstatic void shutdown_panic(void *junk, int howto); 15865395Speterstatic void shutdown_reset(void *junk, int howto); 15917658Sjulian 16050107Smsmith/* register various local shutdown events */ 161110859Salfredstatic void 16250107Smsmithshutdown_conf(void *unused) 16350107Smsmith{ 164110859Salfred 165110859Salfred EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 166214279Sbrucec SHUTDOWN_PRI_FIRST); 167110859Salfred EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 168110859Salfred SHUTDOWN_PRI_LAST + 100); 169110859Salfred EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 170110859Salfred SHUTDOWN_PRI_LAST + 100); 171110859Salfred EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, 172110859Salfred SHUTDOWN_PRI_LAST + 200); 17350107Smsmith} 17448868Sphk 175177253SrwatsonSYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL); 17650107Smsmith 17717658Sjulian/* 178167211Srwatson * The system call that results in a reboot. 17917658Sjulian */ 18082749Sdillon/* ARGSUSED */ 18117658Sjulianint 182225617Skmacysys_reboot(struct thread *td, struct reboot_args *uap) 18317658Sjulian{ 18417658Sjulian int error; 18517658Sjulian 186106024Srwatson error = 0; 187106024Srwatson#ifdef MAC 188172930Srwatson error = mac_system_check_reboot(td->td_ucred, uap->opt); 189106024Srwatson#endif 190106024Srwatson if (error == 0) 191164033Srwatson error = priv_check(td, PRIV_REBOOT); 192106024Srwatson if (error == 0) { 193106024Srwatson mtx_lock(&Giant); 194214004Smarcel kern_reboot(uap->opt); 195106024Srwatson mtx_unlock(&Giant); 196106024Srwatson } 19782749Sdillon return (error); 19817658Sjulian} 19917658Sjulian 20017658Sjulian/* 20117658Sjulian * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 20217658Sjulian */ 20365268Smsmithstatic int shutdown_howto = 0; 20465268Smsmith 20517658Sjulianvoid 20665268Smsmithshutdown_nice(int howto) 20717658Sjulian{ 208110859Salfred 20965268Smsmith shutdown_howto = howto; 210110859Salfred 21117658Sjulian /* Send a signal to init(8) and have it shutdown the world */ 21217658Sjulian if (initproc != NULL) { 21373913Sjhb PROC_LOCK(initproc); 214225617Skmacy kern_psignal(initproc, SIGINT); 21573913Sjhb PROC_UNLOCK(initproc); 21617658Sjulian } else { 21717658Sjulian /* No init(8) running, so simply reboot */ 218214004Smarcel kern_reboot(RB_NOSYNC); 21917658Sjulian } 22017658Sjulian return; 22117658Sjulian} 22217658Sjulianstatic int waittime = -1; 22317658Sjulian 22454233Sphkstatic void 22565395Speterprint_uptime(void) 22654233Sphk{ 22754233Sphk int f; 22854233Sphk struct timespec ts; 22954233Sphk 23054233Sphk getnanouptime(&ts); 23154233Sphk printf("Uptime: "); 23254233Sphk f = 0; 23354233Sphk if (ts.tv_sec >= 86400) { 23465764Sjhb printf("%ldd", (long)ts.tv_sec / 86400); 23554233Sphk ts.tv_sec %= 86400; 23654233Sphk f = 1; 23754233Sphk } 23854233Sphk if (f || ts.tv_sec >= 3600) { 23965764Sjhb printf("%ldh", (long)ts.tv_sec / 3600); 24054233Sphk ts.tv_sec %= 3600; 24154233Sphk f = 1; 24254233Sphk } 24354233Sphk if (f || ts.tv_sec >= 60) { 24465764Sjhb printf("%ldm", (long)ts.tv_sec / 60); 24554233Sphk ts.tv_sec %= 60; 24654233Sphk f = 1; 24754233Sphk } 24865764Sjhb printf("%lds\n", (long)ts.tv_sec); 24954233Sphk} 25054233Sphk 251222801Smarcelint 252222801Smarceldoadump(boolean_t textdump) 25394169Sphk{ 254222801Smarcel boolean_t coredump; 255110859Salfred 256222801Smarcel if (dumping) 257222801Smarcel return (EBUSY); 258222801Smarcel if (dumper.dumper == NULL) 259222801Smarcel return (ENXIO); 260132412Sjulian 26194169Sphk savectx(&dumppcb); 262131927Smarcel dumptid = curthread->td_tid; 26394169Sphk dumping++; 264222801Smarcel 265222801Smarcel coredump = TRUE; 266174921Srwatson#ifdef DDB 267222801Smarcel if (textdump && textdump_pending) { 268222801Smarcel coredump = FALSE; 269174921Srwatson textdump_dumpsys(&dumper); 270222801Smarcel } 271174921Srwatson#endif 272222801Smarcel if (coredump) 273174921Srwatson dumpsys(&dumper); 274222801Smarcel 275176788Sru dumping--; 276222801Smarcel return (0); 27794169Sphk} 27894169Sphk 279149875Struckmanstatic int 280149875Struckmanisbufbusy(struct buf *bp) 281149875Struckman{ 282149875Struckman if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 && 283175486Sattilio BUF_ISLOCKED(bp)) || 284149875Struckman ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)) 285149875Struckman return (1); 286149875Struckman return (0); 287149875Struckman} 288149875Struckman 28917658Sjulian/* 290137329Snjl * Shutdown the system cleanly to prepare for reboot, halt, or power off. 29117658Sjulian */ 292214004Smarcelvoid 293214004Smarcelkern_reboot(int howto) 29417658Sjulian{ 295133763Struckman static int first_buf_printf = 1; 29617658Sjulian 297137375Smarcel#if defined(SMP) 298137329Snjl /* 299137329Snjl * Bind us to CPU 0 so that all shutdown code runs there. Some 300137329Snjl * systems don't shutdown properly (i.e., ACPI power off) if we 301137329Snjl * run on another processor. 302137329Snjl */ 303228424Savg if (!SCHEDULER_STOPPED()) { 304228424Savg thread_lock(curthread); 305228424Savg sched_bind(curthread, 0); 306228424Savg thread_unlock(curthread); 307228424Savg KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0")); 308228424Savg } 309137263Speter#endif 310155383Sjeff /* We're in the process of rebooting. */ 311155383Sjeff rebooting = 1; 312137263Speter 31365268Smsmith /* collect extra flags that shutdown_nice might have set */ 31465268Smsmith howto |= shutdown_howto; 31565268Smsmith 31682119Sjhb /* We are out of the debugger now. */ 317131927Smarcel kdb_active = 0; 31882119Sjhb 31927997Sjulian /* 32027997Sjulian * Do any callouts that should be done BEFORE syncing the filesystems. 32127997Sjulian */ 32250107Smsmith EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 32327997Sjulian 32427997Sjulian /* 32527997Sjulian * Now sync filesystems 32627997Sjulian */ 32717658Sjulian if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 32817658Sjulian register struct buf *bp; 32965707Sjasone int iter, nbusy, pbusy; 330131481Sjhb#ifndef PREEMPTION 33165707Sjasone int subiter; 332131481Sjhb#endif 33317658Sjulian 33417658Sjulian waittime = 0; 33517658Sjulian 336221173Sattilio#ifdef SW_WATCHDOG 337221173Sattilio wdog_kern_pat(WD_LASTVAL); 338221173Sattilio#endif 339225617Skmacy sys_sync(curthread, NULL); 34017658Sjulian 34134266Sjulian /* 34234266Sjulian * With soft updates, some buffers that are 34334266Sjulian * written will be remarked as dirty until other 34434266Sjulian * buffers are written. 34534266Sjulian */ 34665707Sjasone for (iter = pbusy = 0; iter < 20; iter++) { 34717658Sjulian nbusy = 0; 348149875Struckman for (bp = &buf[nbuf]; --bp >= buf; ) 349149875Struckman if (isbufbusy(bp)) 35017658Sjulian nbusy++; 351133763Struckman if (nbusy == 0) { 352133763Struckman if (first_buf_printf) 353136115Sphk printf("All buffers synced."); 35417658Sjulian break; 355133763Struckman } 356133763Struckman if (first_buf_printf) { 357133763Struckman printf("Syncing disks, buffers remaining... "); 358133763Struckman first_buf_printf = 0; 359133763Struckman } 36017658Sjulian printf("%d ", nbusy); 36165707Sjasone if (nbusy < pbusy) 36265707Sjasone iter = 0; 36365707Sjasone pbusy = nbusy; 364221173Sattilio#ifdef SW_WATCHDOG 365221173Sattilio wdog_kern_pat(WD_LASTVAL); 366221173Sattilio#endif 367225617Skmacy sys_sync(curthread, NULL); 368131481Sjhb 369131481Sjhb#ifdef PREEMPTION 370131481Sjhb /* 371131481Sjhb * Drop Giant and spin for a while to allow 372131481Sjhb * interrupt threads to run. 373131481Sjhb */ 374131481Sjhb DROP_GIANT(); 37534266Sjulian DELAY(50000 * iter); 376131481Sjhb PICKUP_GIANT(); 377131481Sjhb#else 378131481Sjhb /* 379131481Sjhb * Drop Giant and context switch several times to 380131481Sjhb * allow interrupt threads to run. 381131481Sjhb */ 382131481Sjhb DROP_GIANT(); 383131481Sjhb for (subiter = 0; subiter < 50 * iter; subiter++) { 384170307Sjeff thread_lock(curthread); 385131481Sjhb mi_switch(SW_VOL, NULL); 386170307Sjeff thread_unlock(curthread); 387131481Sjhb DELAY(1000); 388131481Sjhb } 389131481Sjhb PICKUP_GIANT(); 390131481Sjhb#endif 39117658Sjulian } 392133418Snjl printf("\n"); 39341137Smsmith /* 39441137Smsmith * Count only busy local buffers to prevent forcing 39541137Smsmith * a fsck if we're just a client of a wedged NFS server 39641137Smsmith */ 39741137Smsmith nbusy = 0; 39841137Smsmith for (bp = &buf[nbuf]; --bp >= buf; ) { 399149875Struckman if (isbufbusy(bp)) { 400137186Sphk#if 0 401137186Sphk/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */ 402130640Sphk if (bp->b_dev == NULL) { 40353452Sphk TAILQ_REMOVE(&mountlist, 40448225Smckusick bp->b_vp->v_mount, mnt_list); 40553023Sphk continue; 40653023Sphk } 407137186Sphk#endif 40853023Sphk nbusy++; 409225448Sattilio if (show_busybufs > 0) { 410225448Sattilio printf( 411225448Sattilio "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:", 412225448Sattilio nbusy, bp, bp->b_vp, bp->b_flags, 413225448Sattilio (intmax_t)bp->b_blkno, 414225448Sattilio (intmax_t)bp->b_lblkno); 415225448Sattilio BUF_LOCKPRINTINFO(bp); 416225448Sattilio if (show_busybufs > 1) 417225448Sattilio vn_printf(bp->b_vp, 418225448Sattilio "vnode content: "); 419225448Sattilio } 42046568Speter } 42141137Smsmith } 42217658Sjulian if (nbusy) { 42317658Sjulian /* 42417658Sjulian * Failed to sync all blocks. Indicate this and don't 42517658Sjulian * unmount filesystems (thus forcing an fsck on reboot). 42617658Sjulian */ 427133763Struckman printf("Giving up on %d buffers\n", nbusy); 42817658Sjulian DELAY(5000000); /* 5 seconds */ 42917658Sjulian } else { 430133763Struckman if (!first_buf_printf) 431133763Struckman printf("Final sync complete\n"); 43217658Sjulian /* 43317658Sjulian * Unmount filesystems 43417658Sjulian */ 43517658Sjulian if (panicstr == 0) 43617658Sjulian vfs_unmountall(); 43717658Sjulian } 438157628Spjd swapoff_all(); 43939237Sgibbs DELAY(100000); /* wait for console output to finish */ 44017658Sjulian } 44127997Sjulian 44254233Sphk print_uptime(); 44354233Sphk 44427997Sjulian /* 44527997Sjulian * Ok, now do things that assume all filesystem activity has 44627997Sjulian * been completed. 44727997Sjulian */ 44850107Smsmith EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 449137329Snjl 450132412Sjulian if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 451222801Smarcel doadump(TRUE); 45239237Sgibbs 45339237Sgibbs /* Now that we're going to really halt the system... */ 45450107Smsmith EVENTHANDLER_INVOKE(shutdown_final, howto); 45539237Sgibbs 45650107Smsmith for(;;) ; /* safety against shutdown_reset not working */ 45750107Smsmith /* NOTREACHED */ 45850107Smsmith} 45950107Smsmith 46050107Smsmith/* 46150107Smsmith * If the shutdown was a clean halt, behave accordingly. 46250107Smsmith */ 46350107Smsmithstatic void 46450107Smsmithshutdown_halt(void *junk, int howto) 46550107Smsmith{ 466110859Salfred 46717658Sjulian if (howto & RB_HALT) { 46817658Sjulian printf("\n"); 46917658Sjulian printf("The operating system has halted.\n"); 47017658Sjulian printf("Please press any key to reboot.\n\n"); 47119274Sjulian switch (cngetc()) { 47219274Sjulian case -1: /* No console, just die */ 47319274Sjulian cpu_halt(); 47419274Sjulian /* NOTREACHED */ 47519274Sjulian default: 47639237Sgibbs howto &= ~RB_HALT; 47719274Sjulian break; 47819274Sjulian } 47950107Smsmith } 48050107Smsmith} 48117658Sjulian 48250107Smsmith/* 48350107Smsmith * Check to see if the system paniced, pause and then reboot 48450107Smsmith * according to the specified delay. 48550107Smsmith */ 48650107Smsmithstatic void 48750107Smsmithshutdown_panic(void *junk, int howto) 48850107Smsmith{ 48950107Smsmith int loop; 49050107Smsmith 49150107Smsmith if (howto & RB_DUMP) { 49239237Sgibbs if (PANIC_REBOOT_WAIT_TIME != 0) { 49339237Sgibbs if (PANIC_REBOOT_WAIT_TIME != -1) { 49439237Sgibbs printf("Automatic reboot in %d seconds - " 49539237Sgibbs "press a key on the console to abort\n", 49639237Sgibbs PANIC_REBOOT_WAIT_TIME); 49739237Sgibbs for (loop = PANIC_REBOOT_WAIT_TIME * 10; 49839237Sgibbs loop > 0; --loop) { 49939237Sgibbs DELAY(1000 * 100); /* 1/10th second */ 50039237Sgibbs /* Did user type a key? */ 50139237Sgibbs if (cncheckc() != -1) 50239237Sgibbs break; 50317658Sjulian } 50439237Sgibbs if (!loop) 50550107Smsmith return; 50617658Sjulian } 50739237Sgibbs } else { /* zero time specified - reboot NOW */ 50850107Smsmith return; 50917658Sjulian } 51089522Snik printf("--> Press a key on the console to reboot,\n"); 51189522Snik printf("--> or switch off the system now.\n"); 51239237Sgibbs cngetc(); 51317658Sjulian } 51450107Smsmith} 51550107Smsmith 51650107Smsmith/* 51750107Smsmith * Everything done, now reset 51850107Smsmith */ 51950107Smsmithstatic void 52050107Smsmithshutdown_reset(void *junk, int howto) 52150107Smsmith{ 522110859Salfred 523206878Sattilio printf("Rebooting...\n"); 524206878Sattilio DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 525206878Sattilio 526196196Sattilio /* 527206878Sattilio * Acquiring smp_ipi_mtx here has a double effect: 528206878Sattilio * - it disables interrupts avoiding CPU0 preemption 529206878Sattilio * by fast handlers (thus deadlocking against other CPUs) 530206878Sattilio * - it avoids deadlocks against smp_rendezvous() or, more 531206878Sattilio * generally, threads busy-waiting, with this spinlock held, 532206878Sattilio * and waiting for responses by threads on other CPUs 533206878Sattilio * (ie. smp_tlb_shootdown()). 534206897Sattilio * 535206897Sattilio * For the !SMP case it just needs to handle the former problem. 536196196Sattilio */ 537206897Sattilio#ifdef SMP 538206878Sattilio mtx_lock_spin(&smp_ipi_mtx); 539206897Sattilio#else 540206897Sattilio spinlock_enter(); 541206897Sattilio#endif 542196196Sattilio 54317677Sjulian /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 54417658Sjulian cpu_reset(); 54550107Smsmith /* NOTREACHED */ /* assuming reset worked */ 54617658Sjulian} 54717658Sjulian 54817658Sjulian/* 54917658Sjulian * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 55017658Sjulian * and then reboots. If we are called twice, then we avoid trying to sync 55117658Sjulian * the disks as this often leads to recursive panics. 55217658Sjulian */ 55317658Sjulianvoid 554130164Sphkpanic(const char *fmt, ...) 55517658Sjulian{ 556213648Savg#ifdef SMP 557213648Savg static volatile u_int panic_cpu = NOCPU; 558228424Savg cpuset_t other_cpus; 559213648Savg#endif 560100209Sgallatin struct thread *td = curthread; 561103647Sjhb int bootopt, newpanic; 56217658Sjulian va_list ap; 56338874Sache static char buf[256]; 56417658Sjulian 565228424Savg if (stop_scheduler_on_panic) 566228424Savg spinlock_enter(); 567228424Savg else 568228424Savg critical_enter(); 569228424Savg 57065557Sjasone#ifdef SMP 57182115Sjhb /* 57282115Sjhb * We don't want multiple CPU's to panic at the same time, so we 573101155Sjhb * use panic_cpu as a simple spinlock. We have to keep checking 574101155Sjhb * panic_cpu if we are spinning in case the panic on the first 57582115Sjhb * CPU is canceled. 57682115Sjhb */ 577101155Sjhb if (panic_cpu != PCPU_GET(cpuid)) 578101155Sjhb while (atomic_cmpset_int(&panic_cpu, NOCPU, 579101155Sjhb PCPU_GET(cpuid)) == 0) 580101155Sjhb while (panic_cpu != NOCPU) 581101155Sjhb ; /* nothing */ 582228424Savg 583228424Savg if (stop_scheduler_on_panic) { 584228424Savg if (panicstr == NULL && !kdb_active) { 585228424Savg other_cpus = all_cpus; 586228424Savg CPU_CLR(PCPU_GET(cpuid), &other_cpus); 587228424Savg stop_cpus_hard(other_cpus); 588228424Savg } 589228424Savg 590228424Savg /* 591228424Savg * We set stop_scheduler here and not in the block above, 592228424Savg * because we want to ensure that if panic has been called and 593228424Savg * stop_scheduler_on_panic is true, then stop_scheduler will 594228424Savg * always be set. Even if panic has been entered from kdb. 595228424Savg */ 596228424Savg stop_scheduler = 1; 597228424Savg } 59865557Sjasone#endif 59965557Sjasone 600222865Sattilio bootopt = RB_AUTOBOOT; 601103647Sjhb newpanic = 0; 60217658Sjulian if (panicstr) 60317658Sjulian bootopt |= RB_NOSYNC; 604103647Sjhb else { 605222865Sattilio bootopt |= RB_DUMP; 60617658Sjulian panicstr = fmt; 607103647Sjhb newpanic = 1; 608103647Sjhb } 60917658Sjulian 61017658Sjulian va_start(ap, fmt); 611116398Siedowse if (newpanic) { 612116398Siedowse (void)vsnprintf(buf, sizeof(buf), fmt, ap); 61338874Sache panicstr = buf; 614130164Sphk printf("panic: %s\n", buf); 615116398Siedowse } else { 616116398Siedowse printf("panic: "); 617116398Siedowse vprintf(fmt, ap); 618130164Sphk printf("\n"); 619116398Siedowse } 62017658Sjulian va_end(ap); 62126100Sfsmp#ifdef SMP 622134089Sjhb printf("cpuid = %d\n", PCPU_GET(cpuid)); 62326100Sfsmp#endif 62417658Sjulian 625131927Smarcel#ifdef KDB 626103647Sjhb if (newpanic && trace_on_panic) 627131927Smarcel kdb_backtrace(); 62817658Sjulian if (debugger_on_panic) 629174898Srwatson kdb_enter(KDB_WHY_PANIC, "panic"); 63017658Sjulian#endif 631170307Sjeff /*thread_lock(td); */ 632100209Sgallatin td->td_flags |= TDF_INPANIC; 633170307Sjeff /* thread_unlock(td); */ 63485202Speter if (!sync_on_panic) 63585202Speter bootopt |= RB_NOSYNC; 636228424Savg if (!stop_scheduler_on_panic) 637228424Savg critical_exit(); 638214004Smarcel kern_reboot(bootopt); 63917658Sjulian} 64017658Sjulian 64117768Sjulian/* 64243436Smsmith * Support for poweroff delay. 643197071Sn_hibma * 644197071Sn_hibma * Please note that setting this delay too short might power off your machine 645197071Sn_hibma * before the write cache on your hard disk has been flushed, leading to 646197071Sn_hibma * soft-updates inconsistencies. 64743436Smsmith */ 64854248Smsmith#ifndef POWEROFF_DELAY 64954248Smsmith# define POWEROFF_DELAY 5000 65054248Smsmith#endif 65154248Smsmithstatic int poweroff_delay = POWEROFF_DELAY; 65254248Smsmith 65343436SmsmithSYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 654228449Seadler &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)"); 65543436Smsmith 656110859Salfredstatic void 65750107Smsmithpoweroff_wait(void *junk, int howto) 65843436Smsmith{ 659110859Salfred 660110859Salfred if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 66143436Smsmith return; 66243436Smsmith DELAY(poweroff_delay * 1000); 66343436Smsmith} 66455539Sluoqi 66555539Sluoqi/* 66655539Sluoqi * Some system processes (e.g. syncer) need to be stopped at appropriate 66755539Sluoqi * points in their main loops prior to a system shutdown, so that they 66855539Sluoqi * won't interfere with the shutdown process (e.g. by holding a disk buf 66955539Sluoqi * to cause sync to fail). For each of these system processes, register 67055539Sluoqi * shutdown_kproc() as a handler for one of shutdown events. 67155539Sluoqi */ 67255539Sluoqistatic int kproc_shutdown_wait = 60; 67355539SluoqiSYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 674228449Seadler &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process"); 67555539Sluoqi 67655539Sluoqivoid 67770063Sjhbkproc_shutdown(void *arg, int howto) 67855539Sluoqi{ 67955539Sluoqi struct proc *p; 68055539Sluoqi int error; 68155539Sluoqi 68255539Sluoqi if (panicstr) 68355539Sluoqi return; 68455539Sluoqi 68555539Sluoqi p = (struct proc *)arg; 686132866Snjl printf("Waiting (max %d seconds) for system process `%s' to stop...", 687198408Sjhb kproc_shutdown_wait, p->p_comm); 688172836Sjulian error = kproc_suspend(p, kproc_shutdown_wait * hz); 68955539Sluoqi 69055539Sluoqi if (error == EWOULDBLOCK) 691132866Snjl printf("timed out\n"); 69255539Sluoqi else 693132866Snjl printf("done\n"); 69455539Sluoqi} 69593496Sphk 696173004Sjulianvoid 697173004Sjuliankthread_shutdown(void *arg, int howto) 698173004Sjulian{ 699173004Sjulian struct thread *td; 700173004Sjulian int error; 701173004Sjulian 702173004Sjulian if (panicstr) 703173004Sjulian return; 704173004Sjulian 705173004Sjulian td = (struct thread *)arg; 706173004Sjulian printf("Waiting (max %d seconds) for system thread `%s' to stop...", 707198408Sjhb kproc_shutdown_wait, td->td_name); 708173004Sjulian error = kthread_suspend(td, kproc_shutdown_wait * hz); 709173004Sjulian 710173004Sjulian if (error == EWOULDBLOCK) 711173004Sjulian printf("timed out\n"); 712173004Sjulian else 713173004Sjulian printf("done\n"); 714173004Sjulian} 715173004Sjulian 71693496Sphk/* Registration of dumpers */ 71793496Sphkint 71893496Sphkset_dumper(struct dumperinfo *di) 71993496Sphk{ 720110859Salfred 72193496Sphk if (di == NULL) { 72293496Sphk bzero(&dumper, sizeof dumper); 72393496Sphk return (0); 72493496Sphk } 72593496Sphk if (dumper.dumper != NULL) 72693496Sphk return (EBUSY); 72793496Sphk dumper = *di; 72893496Sphk return (0); 72993496Sphk} 73093496Sphk 731175768Sru/* Call dumper with bounds checking. */ 732175768Sruint 733175768Srudump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical, 734175768Sru off_t offset, size_t length) 735175768Sru{ 736175768Sru 737175768Sru if (length != 0 && (offset < di->mediaoffset || 738175768Sru offset - di->mediaoffset + length > di->mediasize)) { 739225516Sattilio printf("Attempt to write outside dump device boundaries.\n" 740225516Sattilio "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n", 741225516Sattilio (intmax_t)offset, (intmax_t)di->mediaoffset, 742225516Sattilio (uintmax_t)length, (intmax_t)di->mediasize); 743225516Sattilio return (ENOSPC); 744175768Sru } 745175768Sru return (di->dumper(di->priv, virtual, physical, offset, length)); 746175768Sru} 747175768Sru 74893496Sphkvoid 749183527Spetermkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver, 750183527Speter uint64_t dumplen, uint32_t blksz) 751183527Speter{ 752183527Speter 753183527Speter bzero(kdh, sizeof(*kdh)); 754183527Speter strncpy(kdh->magic, magic, sizeof(kdh->magic)); 755183527Speter strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); 756183527Speter kdh->version = htod32(KERNELDUMPVERSION); 757183527Speter kdh->architectureversion = htod32(archver); 758183527Speter kdh->dumplength = htod64(dumplen); 759183527Speter kdh->dumptime = htod64(time_second); 760183527Speter kdh->blocksize = htod32(blksz); 761194118Sjamie strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); 762183527Speter strncpy(kdh->versionstring, version, sizeof(kdh->versionstring)); 763183527Speter if (panicstr != NULL) 764183527Speter strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); 765183527Speter kdh->parity = kerneldump_parity(kdh); 766183527Speter} 767