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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>
69 #include <sys/kern_syscall.h>
70 #include <vm/vm_map.h>
73 #include <sys/thread2.h>
75 #include <sys/mplock2.h>
77 #include <machine/cpu.h>
78 #include <machine/clock.h>
79 #include <machine/md_var.h>
80 #include <machine/smp.h> /* smp_active_mask, cpuid */
81 #include <machine/vmparam.h>
82 #include <machine/thread.h>
84 #include <sys/signalvar.h>
87 #include <dev/misc/gpio/gpio.h>
89 #ifndef PANIC_REBOOT_WAIT_TIME
90 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
94 * Note that stdarg.h and the ANSI style va_start macro is used for both
95 * ANSI and traditional C compilers. We use the machine version to stay
96 * within the confines of the kernel header files.
98 #include <machine/stdarg.h>
102 #ifdef DDB_UNATTENDED
103 int debugger_on_panic = 0;
105 int debugger_on_panic = 1;
107 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
108 &debugger_on_panic, 0, "Run debugger on kernel panic");
111 int trace_on_panic = 1;
113 int trace_on_panic = 0;
115 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
116 &trace_on_panic, 0, "Print stack trace on kernel panic");
119 static int sync_on_panic = 0;
120 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
121 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
123 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
126 * Variable panicstr contains argument to first call to panic; used as flag
127 * to indicate that the kernel has already called panic.
129 const char *panicstr;
131 int dumping; /* system is dumping */
132 static struct dumperinfo dumper; /* selected dumper */
134 globaldata_t panic_cpu_gd; /* which cpu took the panic */
135 struct lwkt_tokref panic_tokens[LWKT_MAXTOKENS];
136 int panic_tokens_count;
138 int bootverbose = 0; /* note: assignment to force non-bss */
139 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW,
140 &bootverbose, 0, "Verbose kernel messages");
142 int cold = 1; /* note: assignment to force non-bss */
143 int dumplo; /* OBSOLETE - savecore compat */
146 static void boot (int) __dead2;
147 static int setdumpdev (cdev_t dev);
148 static void poweroff_wait (void *, int);
149 static void print_uptime (void);
150 static void shutdown_halt (void *junk, int howto);
151 static void shutdown_panic (void *junk, int howto);
152 static void shutdown_reset (void *junk, int howto);
153 static int shutdown_busycount1(struct buf *bp, void *info);
154 static int shutdown_busycount2(struct buf *bp, void *info);
155 static void shutdown_cleanup_proc(struct proc *p);
157 /* register various local shutdown events */
159 shutdown_conf(void *unused)
161 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
162 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
163 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
164 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
167 SYSINIT(shutdown_conf, SI_BOOT2_MACHDEP, SI_ORDER_ANY, shutdown_conf, NULL);
172 * The system call that results in a reboot
177 sys_reboot(struct reboot_args *uap)
179 struct thread *td = curthread;
182 if ((error = priv_check(td, PRIV_REBOOT)))
192 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
194 static int shutdown_howto = 0;
197 shutdown_nice(int howto)
199 shutdown_howto = howto;
201 /* Send a signal to init(8) and have it shutdown the world */
202 if (initproc != NULL) {
203 ksignal(initproc, SIGINT);
205 /* No init(8) running, so simply reboot */
210 static int waittime = -1;
212 struct thread *dumpthread;
223 if (ts.tv_sec >= 86400) {
224 kprintf("%ldd", ts.tv_sec / 86400);
228 if (f || ts.tv_sec >= 3600) {
229 kprintf("%ldh", ts.tv_sec / 3600);
233 if (f || ts.tv_sec >= 60) {
234 kprintf("%ldm", ts.tv_sec / 60);
238 kprintf("%lds\n", ts.tv_sec);
242 * Go through the rigmarole of shutting down..
243 * this used to be in machdep.c but I'll be dammned if I could see
244 * anything machine dependant in it.
250 * Get rid of any user scheduler baggage and then give
251 * us a high priority.
253 if (curthread->td_release)
254 curthread->td_release(curthread);
255 lwkt_setpri_self(TDPRI_MAX);
257 /* collect extra flags that shutdown_nice might have set */
258 howto |= shutdown_howto;
261 * We really want to shutdown on the BSP. Subsystems such as ACPI
262 * can't power-down the box otherwise.
264 if (!CPUMASK_ISUP(smp_active_mask)) {
265 kprintf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
267 if (panicstr == NULL && mycpu->gd_cpuid != 0) {
268 kprintf("Switching to cpu #0 for shutdown\n");
269 lwkt_setcpu_self(globaldata_find(0));
272 * Do any callouts that should be done BEFORE syncing the filesystems.
274 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
277 * Try to get rid of any remaining FS references. The calling
278 * process, proc0, and init may still hold references. The
279 * VFS cache subsystem may still hold a root reference to root.
281 * XXX this needs work. We really need to SIGSTOP all remaining
282 * processes in order to avoid blowups due to proc0's filesystem
283 * references going away. For now just make sure that the init
284 * process is stopped.
286 if (panicstr == NULL) {
287 shutdown_cleanup_proc(curproc);
288 shutdown_cleanup_proc(&proc0);
290 if (initproc != curproc) {
291 ksignal(initproc, SIGSTOP);
292 tsleep(boot, 0, "shutdn", hz / 20);
294 shutdown_cleanup_proc(initproc);
296 vfs_cache_setroot(NULL, NULL);
300 * Now sync filesystems
302 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
303 int iter, nbusy, pbusy;
306 kprintf("\nsyncing disks... ");
308 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
311 * With soft updates, some buffers that are
312 * written will be remarked as dirty until other
313 * buffers are written.
315 for (iter = pbusy = 0; iter < 20; iter++) {
316 nbusy = scan_all_buffers(shutdown_busycount1, NULL);
319 kprintf("%d ", nbusy);
325 * Process soft update work queue if buffers don't sync
326 * after 6 iterations by permitting the syncer to run.
331 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
332 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1);
336 * Count only busy local buffers to prevent forcing
337 * a fsck if we're just a client of a wedged NFS server
339 nbusy = scan_all_buffers(shutdown_busycount2, NULL);
342 * Failed to sync all blocks. Indicate this and don't
343 * unmount filesystems (thus forcing an fsck on reboot).
345 kprintf("giving up on %d buffers\n", nbusy);
347 if (debugger_on_panic)
348 Debugger("busy buffer problem");
350 tsleep(boot, 0, "shutdn", hz * 5 + 1);
354 * Unmount filesystems
356 if (panicstr == NULL)
359 tsleep(boot, 0, "shutdn", hz / 10 + 1);
365 * Dump before doing post_sync shutdown ops
368 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) {
373 * Ok, now do things that assume all filesystem activity has
374 * been completed. This will also call the device shutdown
377 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
379 /* Now that we're going to really halt the system... */
380 EVENTHANDLER_INVOKE(shutdown_final, howto);
382 for(;;) ; /* safety against shutdown_reset not working */
387 * Pass 1 - Figure out if there are any busy or dirty buffers still present.
389 * We ignore TMPFS mounts in this pass.
392 shutdown_busycount1(struct buf *bp, void *info)
396 if ((vp = bp->b_vp) != NULL && vp->v_tag == VT_TMPFS)
398 if ((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp) > 0)
400 if ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)
406 * Pass 2 - only run after pass 1 has completed or has given up
408 * We ignore TMPFS, NFS, MFS, and SMBFS mounts in this pass.
411 shutdown_busycount2(struct buf *bp, void *info)
416 * Ignore tmpfs and nfs mounts
418 if ((vp = bp->b_vp) != NULL) {
419 if (vp->v_tag == VT_TMPFS)
421 if (vp->v_tag == VT_NFS)
423 if (vp->v_tag == VT_MFS)
425 if (vp->v_tag == VT_SMBFS)
430 * Only count buffers stuck on I/O, ignore everything else
432 if (((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp)) ||
433 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
435 * Only count buffers undergoing write I/O
436 * on the related vnode.
438 if (bp->b_vp == NULL ||
439 bio_track_active(&bp->b_vp->v_track_write) == 0) {
442 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
444 "%p dev:?, flags:%08x, loffset:%jd, doffset:%jd\n",
446 bp->b_flags, (intmax_t)bp->b_loffset,
447 (intmax_t)bp->b_bio2.bio_offset);
455 * If the shutdown was a clean halt, behave accordingly.
458 shutdown_halt(void *junk, int howto)
460 if (howto & RB_HALT) {
462 kprintf("The operating system has halted.\n");
463 #ifdef _KERNEL_VIRTUAL
466 kprintf("Please press any key to reboot.\n\n");
468 case -1: /* No console, just die */
480 * Check to see if the system paniced, pause and then reboot
481 * according to the specified delay.
484 shutdown_panic(void *junk, int howto)
488 if (howto & RB_DUMP) {
489 if (PANIC_REBOOT_WAIT_TIME != 0) {
490 if (PANIC_REBOOT_WAIT_TIME != -1) {
491 kprintf("Automatic reboot in %d seconds - "
492 "press a key on the console to abort\n",
493 PANIC_REBOOT_WAIT_TIME);
494 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
496 DELAY(1000 * 100); /* 1/10th second */
497 /* Did user type a key? */
498 if (cncheckc() != -1)
504 } else { /* zero time specified - reboot NOW */
507 kprintf("--> Press a key on the console to reboot,\n");
508 kprintf("--> or switch off the system now.\n");
514 * Everything done, now reset
517 shutdown_reset(void *junk, int howto)
519 kprintf("Rebooting...\n");
520 DELAY(1000000); /* wait 1 sec for kprintf's to complete and be read */
521 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
523 /* NOTREACHED */ /* assuming reset worked */
527 * Try to remove FS references in the specified process. This function
528 * is used during shutdown
532 shutdown_cleanup_proc(struct proc *p)
534 struct filedesc *fdp;
539 if ((fdp = p->p_fd) != NULL) {
542 cache_drop(&fdp->fd_ncdir);
547 cache_drop(&fdp->fd_nrdir);
552 cache_drop(&fdp->fd_njdir);
565 pmap_remove_pages(vmspace_pmap(vm),
567 VM_MAX_USER_ADDRESS);
568 vm_map_remove(&vm->vm_map,
570 VM_MAX_USER_ADDRESS);
575 * Magic number for savecore
577 * exported (symorder) and used at least by savecore(8)
579 * Mark it as used so that gcc doesn't optimize it away.
581 __attribute__((__used__))
582 static u_long const dumpmag = 0x8fca0101UL;
584 __attribute__((__used__))
585 static int dumpsize = 0; /* also for savecore */
587 static int dodump = 1;
589 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
590 "Try to perform coredump on kernel panic");
593 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
594 uint64_t dumplen, uint32_t blksz)
596 bzero(kdh, sizeof(*kdh));
597 strncpy(kdh->magic, magic, sizeof(kdh->magic));
598 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
599 kdh->version = htod32(KERNELDUMPVERSION);
600 kdh->architectureversion = htod32(archver);
601 kdh->dumplength = htod64(dumplen);
602 kdh->dumptime = htod64(time_second);
603 kdh->blocksize = htod32(blksz);
604 strncpy(kdh->hostname, hostname, sizeof(kdh->hostname));
605 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
606 if (panicstr != NULL)
607 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
608 kdh->parity = kerneldump_parity(kdh);
612 setdumpdev(cdev_t dev)
618 disk_dumpconf(NULL, 0/*off*/);
623 * We have to open the device before we can perform ioctls on it,
624 * or the slice/label data may not be present. Device opens are
625 * usually tracked by specfs, but the dump device can be set in
626 * early boot and may not be open so this is somewhat of a hack.
628 doopen = (dev->si_sysref.refcnt == 1);
630 error = dev_dopen(dev, FREAD, S_IFCHR, proc0.p_ucred, NULL);
634 error = disk_dumpconf(dev, 1/*on*/);
640 static void dump_conf (void *dummy);
642 dump_conf(void *dummy)
648 path = kmalloc(MNAMELEN, M_TEMP, M_WAITOK);
649 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
651 * Make sure all disk devices created so far have also been
652 * probed, and also make sure that the newly created device
653 * nodes for probed disks are ready, too.
655 * XXX - Delay an additional 2 seconds to help drivers which
656 * pickup devices asynchronously and are not caught by
657 * CAM's initial probe.
660 tsleep(&_dummy, 0, "syncer", hz*2);
662 dev = kgetdiskbyname(path);
667 if (setdumpdev(dumpdev) != 0)
671 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL);
674 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
679 ndumpdev = dev2udev(dumpdev);
680 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
681 if (error == 0 && req->newptr != NULL)
682 error = setdumpdev(udev2dev(ndumpdev, 0));
686 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
687 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,udev_t", "");
690 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
691 * and then reboots. If we are called twice, then we avoid trying to sync
692 * the disks as this often leads to recursive panics.
695 panic(const char *fmt, ...)
697 int bootopt, newpanic;
698 globaldata_t gd = mycpu;
699 thread_t td = gd->gd_curthread;
701 static char buf[256];
704 * If a panic occurs on multiple cpus before the first is able to
705 * halt the other cpus, only one cpu is allowed to take the panic.
706 * Attempt to be verbose about this situation but if the kprintf()
707 * itself panics don't let us overrun the kernel stack.
709 * Be very nasty about descheduling our thread at the lowest
710 * level possible in an attempt to freeze the thread without
711 * inducing further panics.
713 * Bumping gd_trap_nesting_level will also bypass assertions in
714 * lwkt_switch() and allow us to switch away even if we are a
715 * FAST interrupt or IPI.
717 * The setting of panic_cpu_gd also determines how kprintf()
718 * spin-locks itself. DDB can set panic_cpu_gd as well.
721 globaldata_t xgd = panic_cpu_gd;
724 * Someone else got the panic cpu
726 if (xgd && xgd != gd) {
728 ++mycpu->gd_trap_nesting_level;
729 if (mycpu->gd_trap_nesting_level < 25) {
730 kprintf("SECONDARY PANIC ON CPU %d THREAD %p\n",
731 mycpu->gd_cpuid, td);
733 td->td_release = NULL; /* be a grinch */
735 lwkt_deschedule_self(td);
739 /* --mycpu->gd_trap_nesting_level */
746 if (xgd && xgd == gd)
752 if (atomic_cmpset_ptr(&panic_cpu_gd, NULL, gd))
756 * Try to get the system into a working state. Save information
757 * we are about to destroy.
760 if (panicstr == NULL) {
761 bcopy(td->td_toks_array, panic_tokens, sizeof(panic_tokens));
762 panic_tokens_count = td->td_toks_stop - &td->td_toks_base;
764 lwkt_relalltokens(td);
765 td->td_toks_stop = &td->td_toks_base;
766 if (gd->gd_spinlocks)
767 kprintf("panic with %d spinlocks held\n", gd->gd_spinlocks);
768 gd->gd_spinlocks = 0;
773 bootopt = RB_AUTOBOOT | RB_DUMP;
774 if (sync_on_panic == 0)
775 bootopt |= RB_NOSYNC;
778 bootopt |= RB_NOSYNC;
785 * Format the panic string.
788 kvsnprintf(buf, sizeof(buf), fmt, ap);
792 kprintf("panic: %s\n", buf);
793 /* two separate prints in case of an unmapped page and trap */
794 kprintf("cpuid = %d\n", mycpu->gd_cpuid);
796 #if (NGPIO > 0) && defined(ERROR_LED_ON_PANIC)
797 led_switch("error", 1);
800 #if defined(WDOG_DISABLE_ON_PANIC)
805 * Enter the debugger or fall through & dump. Entering the
806 * debugger will stop cpus. If not entering the debugger stop
809 * Limit the trace history to leave more panic data on a
810 * potentially row-limited console.
813 if (newpanic && trace_on_panic)
815 if (debugger_on_panic)
820 stop_cpus(mycpu->gd_other_cpus);
825 * Support for poweroff delay.
827 #ifndef POWEROFF_DELAY
828 # define POWEROFF_DELAY 5000
830 static int poweroff_delay = POWEROFF_DELAY;
832 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
833 &poweroff_delay, 0, "");
836 poweroff_wait(void *junk, int howto)
838 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
840 DELAY(poweroff_delay * 1000);
844 * Some system processes (e.g. syncer) need to be stopped at appropriate
845 * points in their main loops prior to a system shutdown, so that they
846 * won't interfere with the shutdown process (e.g. by holding a disk buf
847 * to cause sync to fail). For each of these system processes, register
848 * shutdown_kproc() as a handler for one of shutdown events.
850 static int kproc_shutdown_wait = 60;
851 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
852 &kproc_shutdown_wait, 0, "");
855 shutdown_kproc(void *arg, int howto)
864 td = (struct thread *)arg;
865 if ((p = td->td_proc) != NULL) {
866 kprintf("Waiting (max %d seconds) for system process `%s' to stop...",
867 kproc_shutdown_wait, p->p_comm);
869 kprintf("Waiting (max %d seconds) for system thread %s to stop...",
870 kproc_shutdown_wait, td->td_comm);
872 error = suspend_kproc(td, kproc_shutdown_wait * hz);
874 if (error == EWOULDBLOCK)
875 kprintf("timed out\n");
877 kprintf("stopped\n");
880 /* Registration of dumpers */
882 set_dumper(struct dumperinfo *di)
885 bzero(&dumper, sizeof(dumper));
889 if (dumper.dumper != NULL)
899 #if defined (_KERNEL_VIRTUAL)
900 /* VKERNELs don't support dumps */
901 kprintf("VKERNEL doesn't support dumps\n");
905 * If there is a dumper registered and we aren't dumping already, call
906 * the machine dependent dumpsys (md_dumpsys) to do the hard work.
908 * XXX: while right now the md_dumpsys() of x86 and x86_64 could be
909 * factored out completely into here, I rather keep them machine
910 * dependent in case we ever add a platform which does not share
911 * the same dumpsys() code, such as arm.
913 if (dumper.dumper != NULL && !dumping) {
919 int dump_stop_usertds = 0;
923 need_user_resched_remote(void *dummy)
929 dump_reactivate_cpus(void)
934 dump_stop_usertds = 1;
938 for (cpu = 0; cpu < ncpus; cpu++) {
939 gd = globaldata_find(cpu);
940 seq = lwkt_send_ipiq(gd, need_user_resched_remote, NULL);
941 lwkt_wait_ipiq(gd, seq);
944 restart_cpus(stopped_cpus);