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34 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
42 #include "opt_panic.h"
43 #include "opt_show_busybufs.h"
44 #include "opt_sched.h"
45 #include "opt_watchdog.h"
47 #include <sys/param.h>
48 #include <sys/systm.h>
53 #include <sys/eventhandler.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>
63 #include <sys/reboot.h>
64 #include <sys/resourcevar.h>
65 #include <sys/sched.h>
67 #include <sys/sysctl.h>
68 #include <sys/sysproto.h>
70 #include <sys/watchdog.h>
75 #include <machine/cpu.h>
76 #include <machine/pcb.h>
77 #include <machine/smp.h>
79 #include <security/mac/mac_framework.h>
82 #include <vm/vm_object.h>
83 #include <vm/vm_page.h>
84 #include <vm/vm_pager.h>
85 #include <vm/swap_pager.h>
87 #include <sys/signalvar.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.
97 #include <machine/stdarg.h>
100 #ifdef KDB_UNATTENDED
101 int debugger_on_panic = 0;
103 int debugger_on_panic = 1;
105 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
106 &debugger_on_panic, 0, "Run debugger on kernel panic");
107 TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic);
110 static int trace_on_panic = 1;
112 static int trace_on_panic = 0;
114 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
115 &trace_on_panic, 0, "Print stack trace on kernel panic");
116 TUNABLE_INT("debug.trace_on_panic", &trace_on_panic);
119 static int sync_on_panic = 0;
120 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
121 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
122 TUNABLE_INT("kern.sync_on_panic", &sync_on_panic);
124 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
127 * Variable panicstr contains argument to first call to panic; used as flag
128 * to indicate that the kernel has already called panic.
130 const char *panicstr;
132 int dumping; /* system is dumping */
133 int rebooting; /* system is rebooting */
134 static struct dumperinfo dumper; /* our selected dumper */
136 /* Context information for dump-debuggers. */
137 static struct pcb dumppcb; /* Registers. */
138 static lwpid_t dumptid; /* Thread ID. */
140 static void poweroff_wait(void *, int);
141 static void shutdown_halt(void *junk, int howto);
142 static void shutdown_panic(void *junk, int howto);
143 static void shutdown_reset(void *junk, int howto);
145 /* register various local shutdown events */
147 shutdown_conf(void *unused)
150 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
152 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
153 SHUTDOWN_PRI_LAST + 100);
154 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
155 SHUTDOWN_PRI_LAST + 100);
156 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
157 SHUTDOWN_PRI_LAST + 200);
160 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
163 * The system call that results in a reboot.
167 reboot(struct thread *td, struct reboot_args *uap)
173 error = mac_system_check_reboot(td->td_ucred, uap->opt);
176 error = priv_check(td, PRIV_REBOOT);
179 kern_reboot(uap->opt);
186 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
188 static int shutdown_howto = 0;
191 shutdown_nice(int howto)
194 shutdown_howto = howto;
196 /* Send a signal to init(8) and have it shutdown the world */
197 if (initproc != NULL) {
199 psignal(initproc, SIGINT);
200 PROC_UNLOCK(initproc);
202 /* No init(8) running, so simply reboot */
203 kern_reboot(RB_NOSYNC);
207 static int waittime = -1;
218 if (ts.tv_sec >= 86400) {
219 printf("%ldd", (long)ts.tv_sec / 86400);
223 if (f || ts.tv_sec >= 3600) {
224 printf("%ldh", (long)ts.tv_sec / 3600);
228 if (f || ts.tv_sec >= 60) {
229 printf("%ldm", (long)ts.tv_sec / 60);
233 printf("%lds\n", (long)ts.tv_sec);
237 doadump(boolean_t textdump)
243 if (dumper.dumper == NULL)
247 dumptid = curthread->td_tid;
252 if (textdump && textdump_pending) {
254 textdump_dumpsys(&dumper);
265 isbufbusy(struct buf *bp)
267 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
269 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
275 * Shutdown the system cleanly to prepare for reboot, halt, or power off.
278 kern_reboot(int howto)
280 static int first_buf_printf = 1;
284 * Bind us to CPU 0 so that all shutdown code runs there. Some
285 * systems don't shutdown properly (i.e., ACPI power off) if we
286 * run on another processor.
288 thread_lock(curthread);
289 sched_bind(curthread, 0);
290 thread_unlock(curthread);
291 KASSERT(PCPU_GET(cpuid) == 0, ("%s: not running on cpu 0", __func__));
293 /* We're in the process of rebooting. */
296 /* collect extra flags that shutdown_nice might have set */
297 howto |= shutdown_howto;
299 /* We are out of the debugger now. */
303 * Do any callouts that should be done BEFORE syncing the filesystems.
305 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
308 * Now sync filesystems
310 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
311 register struct buf *bp;
312 int iter, nbusy, pbusy;
320 wdog_kern_pat(WD_LASTVAL);
322 sync(curthread, NULL);
325 * With soft updates, some buffers that are
326 * written will be remarked as dirty until other
327 * buffers are written.
329 for (iter = pbusy = 0; iter < 20; iter++) {
331 for (bp = &buf[nbuf]; --bp >= buf; )
335 if (first_buf_printf)
336 printf("All buffers synced.");
339 if (first_buf_printf) {
340 printf("Syncing disks, buffers remaining... ");
341 first_buf_printf = 0;
343 printf("%d ", nbusy);
348 wdog_kern_pat(WD_LASTVAL);
350 sync(curthread, NULL);
354 * Drop Giant and spin for a while to allow
355 * interrupt threads to run.
362 * Drop Giant and context switch several times to
363 * allow interrupt threads to run.
366 for (subiter = 0; subiter < 50 * iter; subiter++) {
367 thread_lock(curthread);
368 mi_switch(SW_VOL, NULL);
369 thread_unlock(curthread);
377 * Count only busy local buffers to prevent forcing
378 * a fsck if we're just a client of a wedged NFS server
381 for (bp = &buf[nbuf]; --bp >= buf; ) {
384 /* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */
385 if (bp->b_dev == NULL) {
386 TAILQ_REMOVE(&mountlist,
387 bp->b_vp->v_mount, mnt_list);
392 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
394 "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
396 bp->b_flags, (long)bp->b_blkno,
403 * Failed to sync all blocks. Indicate this and don't
404 * unmount filesystems (thus forcing an fsck on reboot).
406 printf("Giving up on %d buffers\n", nbusy);
407 DELAY(5000000); /* 5 seconds */
409 if (!first_buf_printf)
410 printf("Final sync complete\n");
412 * Unmount filesystems
418 DELAY(100000); /* wait for console output to finish */
424 * Ok, now do things that assume all filesystem activity has
427 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
429 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
432 /* Now that we're going to really halt the system... */
433 EVENTHANDLER_INVOKE(shutdown_final, howto);
435 for(;;) ; /* safety against shutdown_reset not working */
440 * If the shutdown was a clean halt, behave accordingly.
443 shutdown_halt(void *junk, int howto)
446 if (howto & RB_HALT) {
448 printf("The operating system has halted.\n");
449 printf("Please press any key to reboot.\n\n");
451 case -1: /* No console, just die */
462 * Check to see if the system paniced, pause and then reboot
463 * according to the specified delay.
466 shutdown_panic(void *junk, int howto)
470 if (howto & RB_DUMP) {
471 if (PANIC_REBOOT_WAIT_TIME != 0) {
472 if (PANIC_REBOOT_WAIT_TIME != -1) {
473 printf("Automatic reboot in %d seconds - "
474 "press a key on the console to abort\n",
475 PANIC_REBOOT_WAIT_TIME);
476 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
478 DELAY(1000 * 100); /* 1/10th second */
479 /* Did user type a key? */
480 if (cncheckc() != -1)
486 } else { /* zero time specified - reboot NOW */
489 printf("--> Press a key on the console to reboot,\n");
490 printf("--> or switch off the system now.\n");
496 * Everything done, now reset
499 shutdown_reset(void *junk, int howto)
502 printf("Rebooting...\n");
503 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
506 * Acquiring smp_ipi_mtx here has a double effect:
507 * - it disables interrupts avoiding CPU0 preemption
508 * by fast handlers (thus deadlocking against other CPUs)
509 * - it avoids deadlocks against smp_rendezvous() or, more
510 * generally, threads busy-waiting, with this spinlock held,
511 * and waiting for responses by threads on other CPUs
512 * (ie. smp_tlb_shootdown()).
514 * For the !SMP case it just needs to handle the former problem.
517 mtx_lock_spin(&smp_ipi_mtx);
522 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
524 /* NOTREACHED */ /* assuming reset worked */
528 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
529 * and then reboots. If we are called twice, then we avoid trying to sync
530 * the disks as this often leads to recursive panics.
533 panic(const char *fmt, ...)
536 static volatile u_int panic_cpu = NOCPU;
538 struct thread *td = curthread;
539 int bootopt, newpanic;
541 static char buf[256];
546 * We don't want multiple CPU's to panic at the same time, so we
547 * use panic_cpu as a simple spinlock. We have to keep checking
548 * panic_cpu if we are spinning in case the panic on the first
551 if (panic_cpu != PCPU_GET(cpuid))
552 while (atomic_cmpset_int(&panic_cpu, NOCPU,
553 PCPU_GET(cpuid)) == 0)
554 while (panic_cpu != NOCPU)
558 bootopt = RB_AUTOBOOT;
561 bootopt |= RB_NOSYNC;
570 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
572 printf("panic: %s\n", buf);
580 printf("cpuid = %d\n", PCPU_GET(cpuid));
584 if (newpanic && trace_on_panic)
586 if (debugger_on_panic)
587 kdb_enter(KDB_WHY_PANIC, "panic");
588 #ifdef RESTARTABLE_PANICS
589 /* See if the user aborted the panic, in which case we continue. */
590 if (panicstr == NULL) {
592 atomic_store_rel_int(&panic_cpu, NOCPU);
598 /*thread_lock(td); */
599 td->td_flags |= TDF_INPANIC;
600 /* thread_unlock(td); */
602 bootopt |= RB_NOSYNC;
604 kern_reboot(bootopt);
608 * Support for poweroff delay.
610 * Please note that setting this delay too short might power off your machine
611 * before the write cache on your hard disk has been flushed, leading to
612 * soft-updates inconsistencies.
614 #ifndef POWEROFF_DELAY
615 # define POWEROFF_DELAY 5000
617 static int poweroff_delay = POWEROFF_DELAY;
619 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
620 &poweroff_delay, 0, "");
623 poweroff_wait(void *junk, int howto)
626 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
628 DELAY(poweroff_delay * 1000);
632 * Some system processes (e.g. syncer) need to be stopped at appropriate
633 * points in their main loops prior to a system shutdown, so that they
634 * won't interfere with the shutdown process (e.g. by holding a disk buf
635 * to cause sync to fail). For each of these system processes, register
636 * shutdown_kproc() as a handler for one of shutdown events.
638 static int kproc_shutdown_wait = 60;
639 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
640 &kproc_shutdown_wait, 0, "");
643 kproc_shutdown(void *arg, int howto)
651 p = (struct proc *)arg;
652 printf("Waiting (max %d seconds) for system process `%s' to stop...",
653 kproc_shutdown_wait, p->p_comm);
654 error = kproc_suspend(p, kproc_shutdown_wait * hz);
656 if (error == EWOULDBLOCK)
657 printf("timed out\n");
663 kthread_shutdown(void *arg, int howto)
671 td = (struct thread *)arg;
672 printf("Waiting (max %d seconds) for system thread `%s' to stop...",
673 kproc_shutdown_wait, td->td_name);
674 error = kthread_suspend(td, kproc_shutdown_wait * hz);
676 if (error == EWOULDBLOCK)
677 printf("timed out\n");
682 /* Registration of dumpers */
684 set_dumper(struct dumperinfo *di)
688 bzero(&dumper, sizeof dumper);
691 if (dumper.dumper != NULL)
697 /* Call dumper with bounds checking. */
699 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
700 off_t offset, size_t length)
703 if (length != 0 && (offset < di->mediaoffset ||
704 offset - di->mediaoffset + length > di->mediasize)) {
705 printf("Attempt to write outside dump device boundaries.\n");
708 return (di->dumper(di->priv, virtual, physical, offset, length));
712 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
713 uint64_t dumplen, uint32_t blksz)
716 bzero(kdh, sizeof(*kdh));
717 strncpy(kdh->magic, magic, sizeof(kdh->magic));
718 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
719 kdh->version = htod32(KERNELDUMPVERSION);
720 kdh->architectureversion = htod32(archver);
721 kdh->dumplength = htod64(dumplen);
722 kdh->dumptime = htod64(time_second);
723 kdh->blocksize = htod32(blksz);
724 strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
725 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
726 if (panicstr != NULL)
727 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
728 kdh->parity = kerneldump_parity(kdh);