/*- * 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: src/sys/kern/kern_shutdown.c,v 1.72.2.12 2002/02/21 19:15:10 dillon Exp $ * $DragonFly: src/sys/kern/kern_shutdown.c,v 1.59 2007/07/02 01:41:26 dillon Exp $ */ #include "opt_ddb.h" #include "opt_ddb_trace.h" #include "opt_hw_wdog.h" #include "opt_panic.h" #include "opt_show_busybufs.h" #include #include #include #include #include #include #include #include /* FREAD */ #include /* S_IFCHR */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* smp_active_mask, cpuid */ #include #include #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. We use the machine version to stay * within the confines of the kernel header files. */ #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"); extern void db_print_backtrace(void); #ifdef DDB_TRACE int trace_on_panic = 1; #else int trace_on_panic = 0; #endif SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW, &trace_on_panic, 0, "Print stack trace on kernel panic"); #endif static 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 */ #ifdef SMP u_int panic_cpu_interlock; /* panic interlock */ globaldata_t panic_cpu_gd; /* which cpu took the panic */ #endif int bootverbose = 0; /* note: assignment to force non-bss */ int cold = 1; /* note: assignment to force non-bss */ int dumplo; /* OBSOLETE - savecore compat */ u_int64_t dumplo64; static void boot (int) __dead2; static void dumpsys (void); static int setdumpdev (cdev_t dev); static void poweroff_wait (void *, int); static void print_uptime (void); static void shutdown_halt (void *junk, int howto); static void shutdown_panic (void *junk, int howto); static void shutdown_reset (void *junk, int howto); static int shutdown_busycount1(struct buf *bp, void *info); static int shutdown_busycount2(struct buf *bp, void *info); static void shutdown_cleanup_proc(struct proc *p); /* 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_BOOT2_MACHDEP, SI_ORDER_ANY, shutdown_conf, NULL) /* ARGSUSED */ /* * The system call that results in a reboot */ int sys_reboot(struct reboot_args *uap) { struct thread *td = curthread; int error; if ((error = suser(td))) return (error); boot(uap->opt); return (0); } /* * 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) { ksignal(initproc, SIGINT); } else { /* No init(8) running, so simply reboot */ boot(RB_NOSYNC); } return; } static int waittime = -1; static struct thread *dumpthread; static struct pcb dumppcb; static void print_uptime(void) { int f; struct timespec ts; getnanouptime(&ts); kprintf("Uptime: "); f = 0; if (ts.tv_sec >= 86400) { kprintf("%ldd", ts.tv_sec / 86400); ts.tv_sec %= 86400; f = 1; } if (f || ts.tv_sec >= 3600) { kprintf("%ldh", ts.tv_sec / 3600); ts.tv_sec %= 3600; f = 1; } if (f || ts.tv_sec >= 60) { kprintf("%ldm", ts.tv_sec / 60); ts.tv_sec %= 60; f = 1; } kprintf("%lds\n", 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) { /* * Get rid of any user scheduler baggage and then give * us a high priority. */ if (curthread->td_release) curthread->td_release(curthread); lwkt_setpri_self(TDPRI_MAX); /* collect extra flags that shutdown_nice might have set */ howto |= shutdown_howto; #ifdef SMP /* * We really want to shutdown on the BSP. Subsystems such as ACPI * can't power-down the box otherwise. */ if (smp_active_mask > 1) { kprintf("boot() called on cpu#%d\n", mycpu->gd_cpuid); } if (panicstr == NULL && mycpu->gd_cpuid != 0) { kprintf("Switching to cpu #0 for shutdown\n"); lwkt_setcpu_self(globaldata_find(0)); } #endif /* * Do any callouts that should be done BEFORE syncing the filesystems. */ EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); /* * Try to get rid of any remaining FS references. The calling * process, proc0, and init may still hold references. The * VFS cache subsystem may still hold a root reference to root. * * XXX this needs work. We really need to SIGSTOP all remaining * processes in order to avoid blowups due to proc0's filesystem * references going away. For now just make sure that the init * process is stopped. */ if (panicstr == NULL) { shutdown_cleanup_proc(curproc); shutdown_cleanup_proc(&proc0); if (initproc) { if (initproc != curproc) { ksignal(initproc, SIGSTOP); tsleep(boot, 0, "shutdn", hz / 20); } shutdown_cleanup_proc(initproc); } vfs_cache_setroot(NULL, NULL); } /* * Now sync filesystems */ if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { int iter, nbusy, pbusy; waittime = 0; kprintf("\nsyncing disks... "); sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ /* * 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 = scan_all_buffers(shutdown_busycount1, NULL); if (nbusy == 0) break; kprintf("%d ", nbusy); if (nbusy < pbusy) iter = 0; pbusy = nbusy; /* * XXX: * Process soft update work queue if buffers don't sync * after 6 iterations by permitting the syncer to run. */ if (iter > 5 && bioops.io_sync) (*bioops.io_sync)(NULL); sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ tsleep(boot, 0, "shutdn", hz * iter / 20 + 1); } kprintf("\n"); /* * Count only busy local buffers to prevent forcing * a fsck if we're just a client of a wedged NFS server */ nbusy = scan_all_buffers(shutdown_busycount2, NULL); if (nbusy) { /* * Failed to sync all blocks. Indicate this and don't * unmount filesystems (thus forcing an fsck on reboot). */ kprintf("giving up on %d buffers\n", nbusy); #ifdef DDB Debugger("busy buffer problem"); #endif /* DDB */ tsleep(boot, 0, "shutdn", hz * 5 + 1); } else { kprintf("done\n"); /* * Unmount filesystems */ if (panicstr == NULL) vfs_unmountall(); } tsleep(boot, 0, "shutdn", hz / 10 + 1); } print_uptime(); /* * Dump before doing post_sync shutdown ops */ crit_enter(); if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) dumpsys(); /* * Ok, now do things that assume all filesystem activity has * been completed. This will also call the device shutdown * methods. */ EVENTHANDLER_INVOKE(shutdown_post_sync, howto); /* Now that we're going to really halt the system... */ EVENTHANDLER_INVOKE(shutdown_final, howto); for(;;) ; /* safety against shutdown_reset not working */ /* NOTREACHED */ } static int shutdown_busycount1(struct buf *bp, void *info) { if ((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp) > 0) return(1); if ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) return (1); return (0); } static int shutdown_busycount2(struct buf *bp, void *info) { if (((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp)) || ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { /* * Only count buffers undergoing write I/O * on the related vnode. */ if (bp->b_vp == NULL || bp->b_vp->v_track_write.bk_active == 0) { return (0); } #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) kprintf( "%p dev:?, flags:%08x, loffset:%lld, doffset:%lld\n", bp, bp->b_flags, bp->b_loffset, bp->b_bio2.bio_offset); #endif return(1); } return(0); } /* * If the shutdown was a clean halt, behave accordingly. */ static void shutdown_halt(void *junk, int howto) { if (howto & RB_HALT) { kprintf("\n"); kprintf("The operating system has halted.\n"); #ifdef _KERNEL_VIRTUAL cpu_halt(); #else kprintf("Please press any key to reboot.\n\n"); switch (cngetc()) { case -1: /* No console, just die */ cpu_halt(); /* NOTREACHED */ default: howto &= ~RB_HALT; break; } #endif } } /* * 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) { kprintf("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; } kprintf("--> Press a key on the console to reboot,\n"); kprintf("--> or switch off the system now.\n"); cngetc(); } } /* * Everything done, now reset */ static void shutdown_reset(void *junk, int howto) { kprintf("Rebooting...\n"); DELAY(1000000); /* wait 1 sec for kprintf's to complete and be read */ /* cpu_boot(howto); */ /* doesn't do anything at the moment */ cpu_reset(); /* NOTREACHED */ /* assuming reset worked */ } /* * Try to remove FS references in the specified process. This function * is used during shutdown */ static void shutdown_cleanup_proc(struct proc *p) { struct filedesc *fdp; struct vmspace *vm; if (p == NULL) return; if ((fdp = p->p_fd) != NULL) { kern_closefrom(0); if (fdp->fd_cdir) { cache_drop(&fdp->fd_ncdir); vrele(fdp->fd_cdir); fdp->fd_cdir = NULL; } if (fdp->fd_rdir) { cache_drop(&fdp->fd_nrdir); vrele(fdp->fd_rdir); fdp->fd_rdir = NULL; } if (fdp->fd_jdir) { cache_drop(&fdp->fd_njdir); vrele(fdp->fd_jdir); fdp->fd_jdir = NULL; } } if (p->p_vkernel) vkernel_exit(p); if (p->p_textvp) { vrele(p->p_textvp); p->p_textvp = NULL; } vm = p->p_vmspace; if (vm != NULL) { pmap_remove_pages(vmspace_pmap(vm), VM_MIN_USER_ADDRESS, VM_MAX_USER_ADDRESS); vm_map_remove(&vm->vm_map, VM_MIN_USER_ADDRESS, VM_MAX_USER_ADDRESS); } } /* * Magic number for savecore * * exported (symorder) and used at least by savecore(8) * * Mark it as used so that gcc doesn't optimize it away. */ __attribute__((__used__)) 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(cdev_t dev) { struct partinfo pinfo; u_int64_t newdumplo; int error; int doopen; if (dev == NULL) { dumpdev = dev; return (0); } bzero(&pinfo, sizeof(pinfo)); /* * We have to open the device before we can perform ioctls on it, * or the slice/label data may not be present. Device opens are * usually tracked by specfs, but the dump device can be set in * early boot and may not be open so this is somewhat of a hack. */ doopen = (dev->si_sysref.refcnt == 1); if (doopen) { error = dev_dopen(dev, FREAD, S_IFCHR, proc0.p_ucred); if (error) return (error); } error = dev_dioctl(dev, DIOCGPART, (void *)&pinfo, 0, proc0.p_ucred); if (doopen) dev_dclose(dev, FREAD, S_IFCHR); if (error || pinfo.media_blocks == 0 || pinfo.media_blksize == 0) return (ENXIO); newdumplo = pinfo.media_blocks - ((u_int64_t)Maxmem * PAGE_SIZE / DEV_BSIZE); if ((int64_t)newdumplo < (int64_t)pinfo.reserved_blocks) return (ENOSPC); dumpdev = dev; dumplo64 = newdumplo; return (0); } /* ARGSUSED */ static void dump_conf (void *dummy); static void dump_conf(void *dummy) { char *path; cdev_t dev; path = kmalloc(MNAMELEN, M_TEMP, M_WAITOK); if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) { dev = kgetdiskbyname(path); if (dev != NULL) dumpdev = dev; } kfree(path, M_TEMP); if (setdumpdev(dumpdev) != 0) dumpdev = NULL; } 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,udev_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); dumpthread = curthread; if (dumping++) { kprintf("Dump already in progress, bailing...\n"); return; } if (!dodump) return; if (dumpdev == NULL) return; dumpsize = Maxmem; kprintf("\ndumping to dev %s, blockno %lld\n", devtoname(dumpdev), dumplo64); kprintf("dump "); error = dev_ddump(dumpdev); if (error == 0) { kprintf("succeeded\n"); return; } kprintf("failed, reason: "); switch (error) { case ENOSYS: case ENODEV: kprintf("device doesn't support a dump routine\n"); break; case ENXIO: kprintf("device bad\n"); break; case EFAULT: kprintf("device not ready\n"); break; case EINVAL: kprintf("area improper\n"); break; case EIO: kprintf("i/o error\n"); break; case EINTR: kprintf("aborted from console\n"); break; default: kprintf("unknown, error = %d\n", error); break; } } int dumpstatus(vm_offset_t addr, off_t count) { int c; if (addr % (1024 * 1024) == 0) { #ifdef HW_WDOG if (wdog_tickler) (*wdog_tickler)(); #endif kprintf("%ld ", (long)(count / (1024 * 1024))); } if ((c = cncheckc()) == 0x03) return -1; else if (c != -1) kprintf("[CTRL-C to abort] "); return 0; } /* * 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. */ void panic(const char *fmt, ...) { int bootopt, newpanic; __va_list ap; static char buf[256]; #ifdef SMP /* * If a panic occurs on multiple cpus before the first is able to * halt the other cpus, only one cpu is allowed to take the panic. * Attempt to be verbose about this situation but if the kprintf() * itself panics don't let us overrun the kernel stack. * * Be very nasty about descheduling our thread at the lowest * level possible in an attempt to freeze the thread without * inducing further panics. * * Bumping gd_trap_nesting_level will also bypass assertions in * lwkt_switch() and allow us to switch away even if we are a * FAST interrupt or IPI. */ if (atomic_poll_acquire_int(&panic_cpu_interlock)) { panic_cpu_gd = mycpu; } else if (panic_cpu_gd != mycpu) { crit_enter(); ++mycpu->gd_trap_nesting_level; if (mycpu->gd_trap_nesting_level < 25) { kprintf("SECONDARY PANIC ON CPU %d THREAD %p\n", mycpu->gd_cpuid, curthread); } curthread->td_release = NULL; /* be a grinch */ for (;;) { lwkt_deschedule_self(curthread); lwkt_switch(); } /* NOT REACHED */ /* --mycpu->gd_trap_nesting_level */ /* crit_exit() */ } #endif bootopt = RB_AUTOBOOT | RB_DUMP; if (sync_on_panic == 0) bootopt |= RB_NOSYNC; newpanic = 0; if (panicstr) bootopt |= RB_NOSYNC; else { panicstr = fmt; newpanic = 1; } __va_start(ap, fmt); kvsnprintf(buf, sizeof(buf), fmt, ap); if (panicstr == fmt) panicstr = buf; __va_end(ap); kprintf("panic: %s\n", buf); #ifdef SMP /* two separate prints in case of an unmapped page and trap */ kprintf("mp_lock = %08x; ", mp_lock); kprintf("cpuid = %d\n", mycpu->gd_cpuid); #endif #if defined(DDB) if (newpanic && trace_on_panic) db_print_backtrace(); if (debugger_on_panic) Debugger ("panic"); #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 shutdown_kproc(void *arg, int howto) { struct thread *td; struct proc *p; int error; if (panicstr) return; td = (struct thread *)arg; if ((p = td->td_proc) != NULL) { kprintf("Waiting (max %d seconds) for system process `%s' to stop...", kproc_shutdown_wait, p->p_comm); } else { kprintf("Waiting (max %d seconds) for system thread %s to stop...", kproc_shutdown_wait, td->td_comm); } error = suspend_kproc(td, kproc_shutdown_wait * hz); if (error == EWOULDBLOCK) kprintf("timed out\n"); else kprintf("stopped\n"); }