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34 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
35 * $FreeBSD: src/sys/kern/kern_shutdown.c,v 1.72.2.12 2002/02/21 19:15:10 dillon Exp $
39 #include "opt_ddb_trace.h"
40 #include "opt_panic.h"
41 #include "opt_show_busybufs.h"
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/eventhandler.h>
49 #include <sys/diskslice.h>
50 #include <sys/reboot.h>
53 #include <sys/fcntl.h> /* FREAD */
54 #include <sys/stat.h> /* S_IFCHR */
55 #include <sys/vnode.h>
56 #include <sys/kernel.h>
57 #include <sys/kerneldump.h>
58 #include <sys/kthread.h>
59 #include <sys/malloc.h>
60 #include <sys/mount.h>
61 #include <sys/queue.h>
62 #include <sys/sysctl.h>
63 #include <sys/vkernel.h>
65 #include <sys/sysproto.h>
66 #include <sys/device.h>
70 #include <sys/kern_syscall.h>
71 #include <vm/vm_map.h>
74 #include <sys/thread2.h>
76 #include <sys/mplock2.h>
78 #include <machine/cpu.h>
79 #include <machine/clock.h>
80 #include <machine/md_var.h>
81 #include <machine/smp.h> /* smp_active_mask, cpuid */
82 #include <machine/vmparam.h>
83 #include <machine/thread.h>
85 #include <sys/signalvar.h>
88 #include <dev/acpica/acpi_pvpanic/panic_notifier.h>
89 #include <dev/misc/gpio/gpio.h>
91 #ifndef PANIC_REBOOT_WAIT_TIME
92 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
96 * Note that stdarg.h and the ANSI style va_start macro is used for both
97 * ANSI and traditional C compilers. We use the machine version to stay
98 * within the confines of the kernel header files.
100 #include <machine/stdarg.h>
104 #ifdef DDB_UNATTENDED
105 int debugger_on_panic = 0;
107 int debugger_on_panic = 1;
109 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
110 &debugger_on_panic, 0, "Run debugger on kernel panic");
113 int trace_on_panic = 1;
115 int trace_on_panic = 0;
117 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
118 &trace_on_panic, 0, "Print stack trace on kernel panic");
121 static int sync_on_panic = 0;
122 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
123 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
125 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
128 * Variable panicstr contains argument to first call to panic; used as flag
129 * to indicate that the kernel has already called panic.
131 const char *panicstr;
133 int dumping; /* system is dumping */
134 static struct dumperinfo dumper; /* selected dumper */
136 globaldata_t panic_cpu_gd; /* which cpu took the panic */
137 struct lwkt_tokref panic_tokens[LWKT_MAXTOKENS];
138 int panic_tokens_count;
140 int bootverbose = 0; /* note: assignment to force non-bss */
141 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW,
142 &bootverbose, 0, "Verbose kernel messages");
144 int cold = 1; /* note: assignment to force non-bss */
145 int dumplo; /* OBSOLETE - savecore compat */
148 static void boot (int) __dead2;
149 static int setdumpdev (cdev_t dev);
150 static void poweroff_wait (void *, int);
151 static void print_uptime (void);
152 static void shutdown_halt (void *junk, int howto);
153 static void shutdown_panic (void *junk, int howto);
154 static void shutdown_reset (void *junk, int howto);
155 static int shutdown_busycount1(struct buf *bp, void *info);
156 static int shutdown_busycount2(struct buf *bp, void *info);
157 static void shutdown_cleanup_proc(struct proc *p);
159 /* register various local shutdown events */
161 shutdown_conf(void *unused)
163 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
164 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
165 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
166 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
169 SYSINIT(shutdown_conf, SI_BOOT2_MACHDEP, SI_ORDER_ANY, shutdown_conf, NULL);
174 * The system call that results in a reboot
179 sys_reboot(struct reboot_args *uap)
181 struct thread *td = curthread;
184 if ((error = priv_check(td, PRIV_REBOOT)))
194 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
196 static int shutdown_howto = 0;
199 shutdown_nice(int howto)
201 shutdown_howto = howto;
203 /* Send a signal to init(8) and have it shutdown the world */
204 if (initproc != NULL) {
205 ksignal(initproc, SIGINT);
207 /* No init(8) running, so simply reboot */
212 static int waittime = -1;
214 struct thread *dumpthread;
225 if (ts.tv_sec >= 86400) {
226 kprintf("%ldd", ts.tv_sec / 86400);
230 if (f || ts.tv_sec >= 3600) {
231 kprintf("%ldh", ts.tv_sec / 3600);
235 if (f || ts.tv_sec >= 60) {
236 kprintf("%ldm", ts.tv_sec / 60);
240 kprintf("%lds\n", ts.tv_sec);
244 * Go through the rigmarole of shutting down..
245 * this used to be in machdep.c but I'll be dammned if I could see
246 * anything machine dependant in it.
252 * Get rid of any user scheduler baggage and then give
253 * us a high priority.
255 if (curthread->td_release)
256 curthread->td_release(curthread);
257 lwkt_setpri_self(TDPRI_MAX);
259 /* collect extra flags that shutdown_nice might have set */
260 howto |= shutdown_howto;
263 * We really want to shutdown on the BSP. Subsystems such as ACPI
264 * can't power-down the box otherwise.
266 if (!CPUMASK_ISUP(smp_active_mask)) {
267 kprintf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
269 if (panicstr == NULL && mycpu->gd_cpuid != 0) {
270 kprintf("Switching to cpu #0 for shutdown\n");
271 lwkt_setcpu_self(globaldata_find(0));
274 * Do any callouts that should be done BEFORE syncing the filesystems.
276 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
279 * Try to get rid of any remaining FS references. The calling
280 * process, proc0, and init may still hold references. The
281 * VFS cache subsystem may still hold a root reference to root.
283 * XXX this needs work. We really need to SIGSTOP all remaining
284 * processes in order to avoid blowups due to proc0's filesystem
285 * references going away. For now just make sure that the init
286 * process is stopped.
288 if (panicstr == NULL) {
289 shutdown_cleanup_proc(curproc);
290 shutdown_cleanup_proc(&proc0);
292 if (initproc != curproc) {
293 ksignal(initproc, SIGSTOP);
294 tsleep(boot, 0, "shutdn", hz / 20);
296 shutdown_cleanup_proc(initproc);
298 vfs_cache_setroot(NULL, NULL);
302 * Now sync filesystems
304 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
305 int iter, nbusy, pbusy;
308 kprintf("\nsyncing disks... ");
310 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
313 * With soft updates, some buffers that are
314 * written will be remarked as dirty until other
315 * buffers are written.
317 for (iter = pbusy = 0; iter < 20; iter++) {
318 nbusy = scan_all_buffers(shutdown_busycount1, NULL);
321 kprintf("%d ", nbusy);
327 * Process soft update work queue if buffers don't sync
328 * after 6 iterations by permitting the syncer to run.
333 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
334 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1);
338 * Count only busy local buffers to prevent forcing
339 * a fsck if we're just a client of a wedged NFS server
341 nbusy = scan_all_buffers(shutdown_busycount2, NULL);
344 * Failed to sync all blocks. Indicate this and don't
345 * unmount filesystems (thus forcing an fsck on reboot).
347 kprintf("giving up on %d buffers\n", nbusy);
349 if (debugger_on_panic)
350 Debugger("busy buffer problem");
352 tsleep(boot, 0, "shutdn", hz * 5 + 1);
356 * Unmount filesystems
358 if (panicstr == NULL)
361 tsleep(boot, 0, "shutdn", hz / 10 + 1);
367 * Dump before doing post_sync shutdown ops
370 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) {
375 * Ok, now do things that assume all filesystem activity has
376 * been completed. This will also call the device shutdown
379 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
381 /* Now that we're going to really halt the system... */
382 EVENTHANDLER_INVOKE(shutdown_final, howto);
384 for(;;) ; /* safety against shutdown_reset not working */
389 * Pass 1 - Figure out if there are any busy or dirty buffers still present.
391 * We ignore TMPFS mounts in this pass.
394 shutdown_busycount1(struct buf *bp, void *info)
398 if ((vp = bp->b_vp) != NULL && vp->v_tag == VT_TMPFS)
400 if ((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp) > 0)
402 if ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)
408 * Pass 2 - only run after pass 1 has completed or has given up
410 * We ignore TMPFS, NFS, MFS, and SMBFS mounts in this pass.
413 shutdown_busycount2(struct buf *bp, void *info)
418 * Ignore tmpfs and nfs mounts
420 if ((vp = bp->b_vp) != NULL) {
421 if (vp->v_tag == VT_TMPFS)
423 if (vp->v_tag == VT_NFS)
425 if (vp->v_tag == VT_MFS)
427 if (vp->v_tag == VT_SMBFS)
432 * Only count buffers stuck on I/O, ignore everything else
434 if (((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp)) ||
435 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
437 * Only count buffers undergoing write I/O
438 * on the related vnode.
440 if (bp->b_vp == NULL ||
441 bio_track_active(&bp->b_vp->v_track_write) == 0) {
444 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
446 "%p dev:?, flags:%08x, loffset:%jd, doffset:%jd\n",
448 bp->b_flags, (intmax_t)bp->b_loffset,
449 (intmax_t)bp->b_bio2.bio_offset);
457 * If the shutdown was a clean halt, behave accordingly.
460 shutdown_halt(void *junk, int howto)
462 if (howto & RB_HALT) {
464 kprintf("The operating system has halted.\n");
465 #ifdef _KERNEL_VIRTUAL
468 kprintf("Please press any key to reboot.\n\n");
470 case -1: /* No console, just die */
482 * Check to see if the system paniced, pause and then reboot
483 * according to the specified delay.
486 shutdown_panic(void *junk, int howto)
491 if (howto & RB_DUMP) {
492 if (PANIC_REBOOT_WAIT_TIME != 0) {
493 if (PANIC_REBOOT_WAIT_TIME != -1) {
494 kprintf("Automatic reboot in %d seconds - "
495 "press a key on the console to abort\n",
496 PANIC_REBOOT_WAIT_TIME);
497 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
499 DELAY(1000 * 100); /* 1/10th second */
500 /* Did user type a key? */
502 if (c != -1 && c != NOKEY)
508 } else { /* zero time specified - reboot NOW */
511 kprintf("--> Press a key on the console to reboot,\n");
512 kprintf("--> or switch off the system now.\n");
518 * Everything done, now reset
521 shutdown_reset(void *junk, int howto)
523 kprintf("Rebooting...\n");
524 DELAY(1000000); /* wait 1 sec for kprintf's to complete and be read */
525 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
527 /* NOTREACHED */ /* assuming reset worked */
531 * Try to remove FS references in the specified process. This function
532 * is used during shutdown
536 shutdown_cleanup_proc(struct proc *p)
538 struct filedesc *fdp;
543 if ((fdp = p->p_fd) != NULL) {
546 cache_drop(&fdp->fd_ncdir);
551 cache_drop(&fdp->fd_nrdir);
556 cache_drop(&fdp->fd_njdir);
569 pmap_remove_pages(vmspace_pmap(vm),
571 VM_MAX_USER_ADDRESS);
572 vm_map_remove(&vm->vm_map,
574 VM_MAX_USER_ADDRESS);
579 * Magic number for savecore
581 * exported (symorder) and used at least by savecore(8)
583 * Mark it as used so that gcc doesn't optimize it away.
585 __attribute__((__used__))
586 static u_long const dumpmag = 0x8fca0101UL;
588 __attribute__((__used__))
589 static int dumpsize = 0; /* also for savecore */
591 static int dodump = 1;
593 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
594 "Try to perform coredump on kernel panic");
597 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
598 uint64_t dumplen, uint32_t blksz)
600 bzero(kdh, sizeof(*kdh));
601 strncpy(kdh->magic, magic, sizeof(kdh->magic));
602 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
603 kdh->version = htod32(KERNELDUMPVERSION);
604 kdh->architectureversion = htod32(archver);
605 kdh->dumplength = htod64(dumplen);
606 kdh->dumptime = htod64(time_second);
607 kdh->blocksize = htod32(blksz);
608 strncpy(kdh->hostname, hostname, sizeof(kdh->hostname));
609 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
610 if (panicstr != NULL)
611 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
612 kdh->parity = kerneldump_parity(kdh);
616 setdumpdev(cdev_t dev)
622 disk_dumpconf(NULL, 0/*off*/);
628 * We have to open the device before we can perform ioctls on it,
629 * or the slice/label data may not be present. Device opens are
630 * usually tracked by specfs, but the dump device can be set in
631 * early boot and may not be open so this is somewhat of a hack.
633 doopen = (dev->si_sysref.refcnt == 1);
635 error = dev_dopen(dev, FREAD, S_IFCHR, proc0.p_ucred, NULL);
639 error = disk_dumpconf(dev, 1/*on*/);
647 static void dump_conf (void *dummy);
649 dump_conf(void *dummy)
655 path = kmalloc(MNAMELEN, M_TEMP, M_WAITOK);
656 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
658 * Make sure all disk devices created so far have also been
659 * probed, and also make sure that the newly created device
660 * nodes for probed disks are ready, too.
662 * XXX - Delay an additional 2 seconds to help drivers which
663 * pickup devices asynchronously and are not caught by
664 * CAM's initial probe.
667 tsleep(&_dummy, 0, "syncer", hz*2);
669 dev = kgetdiskbyname(path);
674 if (setdumpdev(dumpdev) != 0)
678 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL);
681 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
686 ndumpdev = dev2udev(dumpdev);
687 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
688 if (error == 0 && req->newptr != NULL)
689 error = setdumpdev(udev2dev(ndumpdev, 0));
693 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
694 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,udev_t", "");
696 static struct panicerinfo *panic_notifier;
699 set_panic_notifier(struct panicerinfo *info)
702 panic_notifier = NULL;
703 else if (panic_notifier != NULL)
706 panic_notifier = info;
712 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
713 * and then reboots. If we are called twice, then we avoid trying to sync
714 * the disks as this often leads to recursive panics.
717 panic(const char *fmt, ...)
719 int bootopt, newpanic;
720 globaldata_t gd = mycpu;
721 thread_t td = gd->gd_curthread;
723 static char buf[256];
726 * If a panic occurs on multiple cpus before the first is able to
727 * halt the other cpus, only one cpu is allowed to take the panic.
728 * Attempt to be verbose about this situation but if the kprintf()
729 * itself panics don't let us overrun the kernel stack.
731 * Be very nasty about descheduling our thread at the lowest
732 * level possible in an attempt to freeze the thread without
733 * inducing further panics.
735 * Bumping gd_trap_nesting_level will also bypass assertions in
736 * lwkt_switch() and allow us to switch away even if we are a
737 * FAST interrupt or IPI.
739 * The setting of panic_cpu_gd also determines how kprintf()
740 * spin-locks itself. DDB can set panic_cpu_gd as well.
743 globaldata_t xgd = panic_cpu_gd;
746 * Someone else got the panic cpu
748 if (xgd && xgd != gd) {
750 ++mycpu->gd_trap_nesting_level;
751 if (mycpu->gd_trap_nesting_level < 25) {
752 kprintf("SECONDARY PANIC ON CPU %d THREAD %p\n",
753 mycpu->gd_cpuid, td);
755 td->td_release = NULL; /* be a grinch */
757 lwkt_deschedule_self(td);
761 /* --mycpu->gd_trap_nesting_level */
768 if (xgd && xgd == gd)
774 if (atomic_cmpset_ptr(&panic_cpu_gd, NULL, gd))
778 * Try to get the system into a working state. Save information
779 * we are about to destroy.
782 if (panicstr == NULL) {
783 bcopy(td->td_toks_array, panic_tokens, sizeof(panic_tokens));
784 panic_tokens_count = td->td_toks_stop - &td->td_toks_base;
786 lwkt_relalltokens(td);
787 td->td_toks_stop = &td->td_toks_base;
788 if (gd->gd_spinlocks)
789 kprintf("panic with %d spinlocks held\n", gd->gd_spinlocks);
790 gd->gd_spinlocks = 0;
795 bootopt = RB_AUTOBOOT | RB_DUMP;
796 if (sync_on_panic == 0)
797 bootopt |= RB_NOSYNC;
800 bootopt |= RB_NOSYNC;
807 * Format the panic string.
810 kvsnprintf(buf, sizeof(buf), fmt, ap);
814 if (panic_notifier != NULL)
815 panic_notifier->notifier(panic_notifier->arg);
816 kprintf("panic: %s\n", buf);
817 /* two separate prints in case of an unmapped page and trap */
818 kprintf("cpuid = %d\n", mycpu->gd_cpuid);
820 #if (NGPIO > 0) && defined(ERROR_LED_ON_PANIC)
821 led_switch("error", 1);
824 #if defined(WDOG_DISABLE_ON_PANIC)
829 * Make sure kgdb knows who we are, there won't be a stoppcbs[]
830 * entry since our cpu wasn't stopped.
833 dumpthread = curthread;
836 * Enter the debugger or fall through & dump. Entering the
837 * debugger will stop cpus. If not entering the debugger stop
840 * Limit the trace history to leave more panic data on a
841 * potentially row-limited console.
845 if (newpanic && trace_on_panic)
847 if (debugger_on_panic)
852 stop_cpus(mycpu->gd_other_cpus);
857 * Support for poweroff delay.
859 #ifndef POWEROFF_DELAY
860 # define POWEROFF_DELAY 5000
862 static int poweroff_delay = POWEROFF_DELAY;
864 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
865 &poweroff_delay, 0, "");
868 poweroff_wait(void *junk, int howto)
870 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
872 DELAY(poweroff_delay * 1000);
876 * Some system processes (e.g. syncer) need to be stopped at appropriate
877 * points in their main loops prior to a system shutdown, so that they
878 * won't interfere with the shutdown process (e.g. by holding a disk buf
879 * to cause sync to fail). For each of these system processes, register
880 * shutdown_kproc() as a handler for one of shutdown events.
882 static int kproc_shutdown_wait = 60;
883 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
884 &kproc_shutdown_wait, 0, "");
887 shutdown_kproc(void *arg, int howto)
896 td = (struct thread *)arg;
897 if ((p = td->td_proc) != NULL) {
898 kprintf("Waiting (max %d seconds) for system process `%s' to stop...",
899 kproc_shutdown_wait, p->p_comm);
901 kprintf("Waiting (max %d seconds) for system thread %s to stop...",
902 kproc_shutdown_wait, td->td_comm);
904 error = suspend_kproc(td, kproc_shutdown_wait * hz);
906 if (error == EWOULDBLOCK)
907 kprintf("timed out\n");
909 kprintf("stopped\n");
912 /* Registration of dumpers */
914 set_dumper(struct dumperinfo *di)
917 bzero(&dumper, sizeof(dumper));
921 if (dumper.dumper != NULL)
931 #if defined (_KERNEL_VIRTUAL)
932 /* vkernels don't support dumps */
933 kprintf("vkernels don't support dumps\n");
937 * If there is a dumper registered and we aren't dumping already, call
938 * the machine dependent dumpsys (md_dumpsys) to do the hard work.
940 * XXX: while right now the md_dumpsys() of x86 and x86_64 could be
941 * factored out completely into here, I rather keep them machine
942 * dependent in case we ever add a platform which does not share
943 * the same dumpsys() code, such as arm.
945 if (dumper.dumper != NULL && !dumping) {
951 int dump_stop_usertds = 0;
955 need_user_resched_remote(void *dummy)
961 dump_reactivate_cpus(void)
966 dump_stop_usertds = 1;
970 for (cpu = 0; cpu < ncpus; cpu++) {
971 gd = globaldata_find(cpu);
972 seq = lwkt_send_ipiq(gd, need_user_resched_remote, NULL);
973 lwkt_wait_ipiq(gd, seq);
976 restart_cpus(stopped_cpus);