/*- * Copyright (c) 1986, 1988, 1991, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 * $FreeBSD$ */ #include "opt_ddb.h" #include "opt_hw_wdog.h" #include "opt_panic.h" #include "opt_show_busybufs.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* smp_active */ #include #include #include #include #include #include #ifdef DDB #include #endif #ifndef PANIC_REBOOT_WAIT_TIME #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ #endif /* * Note that stdarg.h and the ANSI style va_start macro is used for both * ANSI and traditional C compilers. */ #include #ifdef DDB #ifdef DDB_UNATTENDED int debugger_on_panic = 0; #else int debugger_on_panic = 1; #endif SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, &debugger_on_panic, 0, "Run debugger on kernel panic"); #endif SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); #ifdef HW_WDOG /* * If there is a hardware watchdog, point this at the function needed to * hold it off. * It's needed when the kernel needs to do some lengthy operations. * e.g. in wd.c when dumping core.. It's most annoying to have * your precious core-dump only half written because the wdog kicked in. */ watchdog_tickle_fn wdog_tickler = NULL; #endif /* HW_WDOG */ /* * Variable panicstr contains argument to first call to panic; used as flag * to indicate that the kernel has already called panic. */ const char *panicstr; int dumping; /* system is dumping */ static void boot(int) __dead2; static void dumpsys(void); static void poweroff_wait(void *, int); static void shutdown_halt(void *junk, int howto); static void shutdown_panic(void *junk, int howto); static void shutdown_reset(void *junk, int howto); /* register various local shutdown events */ static void shutdown_conf(void *unused) { EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); } SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) /* * The system call that results in a reboot * * MPSAFE */ /* ARGSUSED */ int reboot(struct proc *p, struct reboot_args *uap) { int error; mtx_lock(&Giant); if ((error = suser(p)) == 0) { boot(uap->opt); } mtx_unlock(&Giant); return (error); } /* * Called by events that want to shut down.. e.g on a PC */ static int shutdown_howto = 0; void shutdown_nice(int howto) { shutdown_howto = howto; /* Send a signal to init(8) and have it shutdown the world */ if (initproc != NULL) { PROC_LOCK(initproc); psignal(initproc, SIGINT); PROC_UNLOCK(initproc); } else { /* No init(8) running, so simply reboot */ boot(RB_NOSYNC); } return; } static int waittime = -1; static struct pcb dumppcb; static void print_uptime(void) { int f; struct timespec ts; getnanouptime(&ts); printf("Uptime: "); f = 0; if (ts.tv_sec >= 86400) { printf("%ldd", (long)ts.tv_sec / 86400); ts.tv_sec %= 86400; f = 1; } if (f || ts.tv_sec >= 3600) { printf("%ldh", (long)ts.tv_sec / 3600); ts.tv_sec %= 3600; f = 1; } if (f || ts.tv_sec >= 60) { printf("%ldm", (long)ts.tv_sec / 60); ts.tv_sec %= 60; f = 1; } printf("%lds\n", (long)ts.tv_sec); } /* * Go through the rigmarole of shutting down.. * this used to be in machdep.c but I'll be dammned if I could see * anything machine dependant in it. */ static void boot(int howto) { /* collect extra flags that shutdown_nice might have set */ howto |= shutdown_howto; #ifdef DDB /* We are out of the debugger now. */ db_active = 0; #endif #ifdef SMP if (smp_active) printf("boot() called on cpu#%d\n", PCPU_GET(cpuid)); #endif /* * Do any callouts that should be done BEFORE syncing the filesystems. */ EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); /* * Now sync filesystems */ if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { register struct buf *bp; int iter, nbusy, pbusy; int subiter; waittime = 0; printf("\nsyncing disks... "); sync(&proc0, NULL); /* * With soft updates, some buffers that are * written will be remarked as dirty until other * buffers are written. */ for (iter = pbusy = 0; iter < 20; iter++) { nbusy = 0; for (bp = &buf[nbuf]; --bp >= buf; ) { if ((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp) > 0) { nbusy++; } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) { /* bawrite(bp);*/ nbusy++; } } if (nbusy == 0) break; printf("%d ", nbusy); if (nbusy < pbusy) iter = 0; pbusy = nbusy; sync(&proc0, NULL); if (curproc != NULL) { DROP_GIANT_NOSWITCH(); for (subiter = 0; subiter < 50 * iter; subiter++) { mtx_lock_spin(&sched_lock); setrunqueue(curproc); curproc->p_stats->p_ru.ru_nvcsw++; mi_switch(); /* Allow interrupt threads to run */ mtx_unlock_spin(&sched_lock); DELAY(1000); } PICKUP_GIANT(); } else DELAY(50000 * iter); } printf("\n"); /* * Count only busy local buffers to prevent forcing * a fsck if we're just a client of a wedged NFS server */ nbusy = 0; for (bp = &buf[nbuf]; --bp >= buf; ) { if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { if (bp->b_dev == NODEV) { TAILQ_REMOVE(&mountlist, bp->b_vp->v_mount, mnt_list); continue; } nbusy++; #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) printf( "%d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n", nbusy, devtoname(bp->b_dev), bp->b_flags, (long)bp->b_blkno, (long)bp->b_lblkno); #endif } } if (nbusy) { /* * Failed to sync all blocks. Indicate this and don't * unmount filesystems (thus forcing an fsck on reboot). */ printf("giving up on %d buffers\n", nbusy); DELAY(5000000); /* 5 seconds */ } else { printf("done\n"); /* * Unmount filesystems */ if (panicstr == 0) vfs_unmountall(); } DELAY(100000); /* wait for console output to finish */ } print_uptime(); /* * Ok, now do things that assume all filesystem activity has * been completed. */ EVENTHANDLER_INVOKE(shutdown_post_sync, howto); splhigh(); if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) dumpsys(); /* Now that we're going to really halt the system... */ EVENTHANDLER_INVOKE(shutdown_final, howto); for(;;) ; /* safety against shutdown_reset not working */ /* NOTREACHED */ } /* * If the shutdown was a clean halt, behave accordingly. */ static void shutdown_halt(void *junk, int howto) { if (howto & RB_HALT) { printf("\n"); printf("The operating system has halted.\n"); printf("Please press any key to reboot.\n\n"); switch (cngetc()) { case -1: /* No console, just die */ cpu_halt(); /* NOTREACHED */ default: howto &= ~RB_HALT; break; } } } /* * Check to see if the system paniced, pause and then reboot * according to the specified delay. */ static void shutdown_panic(void *junk, int howto) { int loop; if (howto & RB_DUMP) { if (PANIC_REBOOT_WAIT_TIME != 0) { if (PANIC_REBOOT_WAIT_TIME != -1) { printf("Automatic reboot in %d seconds - " "press a key on the console to abort\n", PANIC_REBOOT_WAIT_TIME); for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { DELAY(1000 * 100); /* 1/10th second */ /* Did user type a key? */ if (cncheckc() != -1) break; } if (!loop) return; } } else { /* zero time specified - reboot NOW */ return; } printf("--> Press a key on the console to reboot <--\n"); cngetc(); } } /* * Everything done, now reset */ static void shutdown_reset(void *junk, int howto) { printf("Rebooting...\n"); DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ /* cpu_boot(howto); */ /* doesn't do anything at the moment */ cpu_reset(); /* NOTREACHED */ /* assuming reset worked */ } /* * Magic number for savecore * * exported (symorder) and used at least by savecore(8) * */ static u_long const dumpmag = 0x8fca0101UL; static int dumpsize = 0; /* also for savecore */ static int dodump = 1; SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, "Try to perform coredump on kernel panic"); static int setdumpdev(dev_t dev) { int psize; long newdumplo; if (dev == NODEV) { dumpdev = dev; return (0); } if (devsw(dev) == NULL) return (ENXIO); /* XXX is this right? */ if (devsw(dev)->d_psize == NULL) return (ENXIO); /* XXX should be ENODEV ? */ psize = devsw(dev)->d_psize(dev); if (psize == -1) return (ENXIO); /* XXX should be ENODEV ? */ /* * XXX should clean up checking in dumpsys() to be more like this. */ newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE); if (newdumplo <= LABELSECTOR) return (ENOSPC); dumpdev = dev; dumplo = newdumplo; return (0); } /* ARGSUSED */ static void dump_conf(void *dummy) { if (setdumpdev(dumpdev) != 0) dumpdev = NODEV; } SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) static int sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) { int error; udev_t ndumpdev; ndumpdev = dev2udev(dumpdev); error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); if (error == 0 && req->newptr != NULL) error = setdumpdev(udev2dev(ndumpdev, 0)); return (error); } SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); /* * Doadump comes here after turning off memory management and * getting on the dump stack, either when called above, or by * the auto-restart code. */ static void dumpsys(void) { int error; savectx(&dumppcb); if (dumping++) { printf("Dump already in progress, bailing...\n"); return; } if (!dodump) return; if (dumpdev == NODEV) return; if (!(devsw(dumpdev))) return; if (!(devsw(dumpdev)->d_dump)) return; dumpsize = Maxmem; printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); printf("dump "); error = (*devsw(dumpdev)->d_dump)(dumpdev); if (error == 0) { printf("succeeded\n"); return; } printf("failed, reason: "); switch (error) { case ENODEV: printf("device doesn't support a dump routine\n"); break; case ENXIO: printf("device bad\n"); break; case EFAULT: printf("device not ready\n"); break; case EINVAL: printf("area improper\n"); break; case EIO: printf("i/o error\n"); break; case EINTR: printf("aborted from console\n"); break; default: printf("unknown, error = %d\n", error); break; } } int dumpstatus(vm_offset_t addr, long count) { int c; if (addr % (1024 * 1024) == 0) { #ifdef HW_WDOG if (wdog_tickler) (*wdog_tickler)(); #endif printf("%ld ", count / (1024 * 1024)); } if ((c = cncheckc()) == 0x03) return -1; else if (c != -1) printf("[CTRL-C to abort] "); return 0; } #ifdef SMP static u_int panic_cpu = NOCPU; #endif /* This had probably better not go into a release. */ static const char *face[4] = { "\\|/ ____ \\|/", "\"@'/ .. \\`@\"", "/_| \\__/ |_\\", " \\__U_/ " }; /* * Panic is called on unresolvable fatal errors. It prints "panic: mesg", * and then reboots. If we are called twice, then we avoid trying to sync * the disks as this often leads to recursive panics. * * MPSAFE */ void panic(const char *fmt, ...) { int bootopt, i, offset; #if defined(DDB) && defined(RESTARTABLE_PANICS) int holding_giant = 0; #endif va_list ap; static char buf[256]; #if 0 /* * We must hold Giant when entering a panic */ if (!mtx_owned(&Giant)) { mtx_lock(&Giant); holding_giant = 1; } #endif #ifdef SMP /* * We don't want multiple CPU's to panic at the same time, so we * use panic_cpu as a simple spinlock. We have to keep checking * panic_cpu if we are spinning in case the panic on the first * CPU is canceled. */ if (panic_cpu != PCPU_GET(cpuid)) { while (atomic_cmpset_int(&panic_cpu, NOCPU, PCPU_GET(cpuid)) == 0) { while (panic_cpu != NOCPU) ; /* nothing */ } } #endif bootopt = RB_AUTOBOOT | RB_DUMP; if (panicstr) bootopt |= RB_NOSYNC; else panicstr = fmt; /* Test that the console is still working. */ offset = (60 + strlen(face[0])) / 2; for (i = 0; i < 4; i++) printf("%*s\n", offset, face[i]); va_start(ap, fmt); (void)vsnprintf(buf, sizeof(buf), fmt, ap); if (panicstr == fmt) panicstr = buf; va_end(ap); printf("panic: %s\n", buf); #ifdef SMP /* two separate prints in case of an unmapped page and trap */ printf("cpuid = %d; ", PCPU_GET(cpuid)); #ifdef APIC_IO printf("lapic.id = %08x\n", lapic.id); #endif #endif #if defined(DDB) if (debugger_on_panic) Debugger ("panic"); #ifdef RESTARTABLE_PANICS /* See if the user aborted the panic, in which case we continue. */ if (panicstr == NULL) { #ifdef SMP atomic_store_rel_int(&panic_cpu, NOCPU); #endif if (holding_giant) mtx_unlock(&Giant); return; } #endif #endif boot(bootopt); } /* * Support for poweroff delay. */ #ifndef POWEROFF_DELAY # define POWEROFF_DELAY 5000 #endif static int poweroff_delay = POWEROFF_DELAY; SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, &poweroff_delay, 0, ""); static void poweroff_wait(void *junk, int howto) { if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) return; DELAY(poweroff_delay * 1000); } /* * Some system processes (e.g. syncer) need to be stopped at appropriate * points in their main loops prior to a system shutdown, so that they * won't interfere with the shutdown process (e.g. by holding a disk buf * to cause sync to fail). For each of these system processes, register * shutdown_kproc() as a handler for one of shutdown events. */ static int kproc_shutdown_wait = 60; SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, &kproc_shutdown_wait, 0, ""); void kproc_shutdown(void *arg, int howto) { struct proc *p; int error; if (panicstr) return; p = (struct proc *)arg; printf("Waiting (max %d seconds) for system process `%s' to stop...", kproc_shutdown_wait, p->p_comm); error = kthread_suspend(p, kproc_shutdown_wait * hz); if (error == EWOULDBLOCK) printf("timed out\n"); else printf("stopped\n"); }