diff options
Diffstat (limited to 'sys/kern/kern_shutdown.c')
| -rw-r--r-- | sys/kern/kern_shutdown.c | 564 |
1 files changed, 564 insertions, 0 deletions
diff --git a/sys/kern/kern_shutdown.c b/sys/kern/kern_shutdown.c new file mode 100644 index 0000000..d2cb69d --- /dev/null +++ b/sys/kern/kern_shutdown.c @@ -0,0 +1,564 @@ +/*- + * 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 <sys/param.h> +#include <sys/systm.h> +#include <sys/bio.h> +#include <sys/buf.h> +#include <sys/conf.h> +#include <sys/cons.h> +#include <sys/disklabel.h> +#include <sys/eventhandler.h> +#include <sys/kernel.h> +#include <sys/kthread.h> +#include <sys/malloc.h> +#include <sys/mount.h> +#include <sys/proc.h> +#include <sys/reboot.h> +#include <sys/resourcevar.h> +#include <sys/smp.h> /* smp_active */ +#include <sys/sysctl.h> +#include <sys/sysproto.h> +#include <sys/vnode.h> + +#include <machine/pcb.h> +#include <machine/md_var.h> +#include <machine/smp.h> + +#include <sys/signalvar.h> +#ifdef DDB +#include <ddb/ddb.h> +#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 <machine/stdarg.h> + +#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 + +int sync_on_panic = 1; +SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW, + &sync_on_panic, 0, "Do a sync before rebooting from a panic"); + +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 struct dumperinfo dumper; /* our selected dumper */ +static struct pcb dumppcb; /* "You Are Here" sign for dump-debuggers */ + +static void boot(int) __dead2; +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 thread *td, struct reboot_args *uap) +{ + int error; + + mtx_lock(&Giant); + if ((error = suser(td)) == 0) + boot(uap->opt); + mtx_unlock(&Giant); + return (error); +} + +/* + * Called by events that want to shut down.. e.g <CTL><ALT><DEL> 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 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); +} + +static void +doadump(void) +{ + savectx(&dumppcb); + dumping++; + dumpsys(&dumper); +} + +/* + * 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(&thread0, 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(&thread0, NULL); + if (curthread != NULL) { + DROP_GIANT(); + for (subiter = 0; subiter < 50 * iter; subiter++) { + mtx_lock_spin(&sched_lock); + setrunqueue(curthread); + curthread->td_proc->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 && dumper.dumper != NULL && !dumping) + doadump(); + + /* 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"); + printf("--> or switch off the system now.\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 */ +} + +#ifdef SMP +static u_int panic_cpu = NOCPU; +#endif + +/* + * 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; + va_list ap; + static char buf[256]; + +#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; + + 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 + return; + } +#endif +#endif + if (!sync_on_panic) + bootopt |= RB_NOSYNC; + 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"); +} + +/* Registration of dumpers */ +int +set_dumper(struct dumperinfo *di) +{ + if (di == NULL) { + bzero(&dumper, sizeof dumper); + return (0); + } + if (dumper.dumper != NULL) + return (EBUSY); + dumper = *di; + return (0); +} + +#if defined(__powerpc__) || defined(__sparc64__) +void +dumpsys(struct dumperinfo *di __unused) +{ + + printf("Kernel dumps not implemented on this architecture\n"); +} +#endif |
