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38 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/kern_shutdown.c,v 1.72.2.12 2002/02/21 19:15:10 dillon Exp $
40 * $DragonFly: src/sys/kern/kern_shutdown.c,v 1.13 2003/11/09 02:22:36 dillon Exp $
44 #include "opt_ddb_trace.h"
45 #include "opt_hw_wdog.h"
46 #include "opt_panic.h"
47 #include "opt_show_busybufs.h"
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/eventhandler.h>
53 #include <sys/disklabel.h>
54 #include <sys/reboot.h>
56 #include <sys/vnode.h>
57 #include <sys/kernel.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>
64 #include <sys/sysproto.h>
65 #include <sys/device.h>
69 #include <machine/pcb.h>
70 #include <machine/clock.h>
71 #include <machine/md_var.h>
72 #include <machine/smp.h> /* smp_active, cpuid */
74 #include <sys/signalvar.h>
76 #ifndef PANIC_REBOOT_WAIT_TIME
77 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
81 * Note that stdarg.h and the ANSI style va_start macro is used for both
82 * ANSI and traditional C compilers. We use the machine version to stay
83 * within the confines of the kernel header files.
85 #include <machine/stdarg.h>
89 int debugger_on_panic = 0;
91 int debugger_on_panic = 1;
93 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
94 &debugger_on_panic, 0, "Run debugger on kernel panic");
96 extern void db_print_backtrace(void);
99 int trace_on_panic = 1;
101 int trace_on_panic = 0;
103 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
104 &trace_on_panic, 0, "Print stack trace on kernel panic");
107 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
111 * If there is a hardware watchdog, point this at the function needed to
113 * It's needed when the kernel needs to do some lengthy operations.
114 * e.g. in wd.c when dumping core.. It's most annoying to have
115 * your precious core-dump only half written because the wdog kicked in.
117 watchdog_tickle_fn wdog_tickler = NULL;
121 * Variable panicstr contains argument to first call to panic; used as flag
122 * to indicate that the kernel has already called panic.
124 const char *panicstr;
126 int dumping; /* system is dumping */
128 static void boot (int) __dead2;
129 static void dumpsys (void);
130 static int setdumpdev (dev_t dev);
131 static void poweroff_wait (void *, int);
132 static void print_uptime (void);
133 static void shutdown_halt (void *junk, int howto);
134 static void shutdown_panic (void *junk, int howto);
135 static void shutdown_reset (void *junk, int howto);
137 /* register various local shutdown events */
139 shutdown_conf(void *unused)
141 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
142 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
143 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
144 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
147 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
152 * The system call that results in a reboot
155 reboot(struct reboot_args *uap)
157 struct thread *td = curthread;
160 if ((error = suser(td)))
168 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
170 static int shutdown_howto = 0;
173 shutdown_nice(int howto)
175 shutdown_howto = howto;
177 /* Send a signal to init(8) and have it shutdown the world */
178 if (initproc != NULL) {
179 psignal(initproc, SIGINT);
181 /* No init(8) running, so simply reboot */
186 static int waittime = -1;
187 static struct pcb dumppcb;
198 if (ts.tv_sec >= 86400) {
199 printf("%ldd", ts.tv_sec / 86400);
203 if (f || ts.tv_sec >= 3600) {
204 printf("%ldh", ts.tv_sec / 3600);
208 if (f || ts.tv_sec >= 60) {
209 printf("%ldm", ts.tv_sec / 60);
213 printf("%lds\n", ts.tv_sec);
217 * Go through the rigmarole of shutting down..
218 * this used to be in machdep.c but I'll be dammned if I could see
219 * anything machine dependant in it.
225 /* collect extra flags that shutdown_nice might have set */
226 howto |= shutdown_howto;
230 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
234 * Do any callouts that should be done BEFORE syncing the filesystems.
236 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
239 * Now sync filesystems
241 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
243 int iter, nbusy, pbusy;
246 printf("\nsyncing disks... ");
248 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
251 * With soft updates, some buffers that are
252 * written will be remarked as dirty until other
253 * buffers are written.
255 for (iter = pbusy = 0; iter < 20; iter++) {
257 for (bp = &buf[nbuf]; --bp >= buf; ) {
258 if ((bp->b_flags & B_INVAL) == 0 &&
259 BUF_REFCNT(bp) > 0) {
261 } else if ((bp->b_flags & (B_DELWRI | B_INVAL))
269 printf("%d ", nbusy);
273 if (iter > 5 && bioops.io_sync)
274 (*bioops.io_sync)(NULL);
275 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
280 * Count only busy local buffers to prevent forcing
281 * a fsck if we're just a client of a wedged NFS server
284 for (bp = &buf[nbuf]; --bp >= buf; ) {
285 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
286 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
287 if (bp->b_dev == NODEV) {
288 TAILQ_REMOVE(&mountlist,
289 bp->b_vp->v_mount, mnt_list);
293 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
295 "%p %d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n",
296 bp, nbusy, devtoname(bp->b_dev),
297 bp->b_flags, (long)bp->b_blkno,
304 * Failed to sync all blocks. Indicate this and don't
305 * unmount filesystems (thus forcing an fsck on reboot).
307 printf("giving up on %d buffers\n", nbusy);
308 DELAY(5000000); /* 5 seconds */
312 * Unmount filesystems
317 DELAY(100000); /* wait for console output to finish */
323 * Ok, now do things that assume all filesystem activity has
326 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
328 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold)
331 /* Now that we're going to really halt the system... */
332 EVENTHANDLER_INVOKE(shutdown_final, howto);
334 for(;;) ; /* safety against shutdown_reset not working */
339 * If the shutdown was a clean halt, behave accordingly.
342 shutdown_halt(void *junk, int howto)
344 if (howto & RB_HALT) {
346 printf("The operating system has halted.\n");
347 printf("Please press any key to reboot.\n\n");
349 case -1: /* No console, just die */
360 * Check to see if the system paniced, pause and then reboot
361 * according to the specified delay.
364 shutdown_panic(void *junk, int howto)
368 if (howto & RB_DUMP) {
369 if (PANIC_REBOOT_WAIT_TIME != 0) {
370 if (PANIC_REBOOT_WAIT_TIME != -1) {
371 printf("Automatic reboot in %d seconds - "
372 "press a key on the console to abort\n",
373 PANIC_REBOOT_WAIT_TIME);
374 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
376 DELAY(1000 * 100); /* 1/10th second */
377 /* Did user type a key? */
378 if (cncheckc() != -1)
384 } else { /* zero time specified - reboot NOW */
387 printf("--> Press a key on the console to reboot,\n");
388 printf("--> or switch off the system now.\n");
394 * Everything done, now reset
397 shutdown_reset(void *junk, int howto)
399 printf("Rebooting...\n");
400 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
401 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
403 /* NOTREACHED */ /* assuming reset worked */
407 * Magic number for savecore
409 * exported (symorder) and used at least by savecore(8)
412 static u_long const dumpmag = 0x8fca0101UL;
414 static int dumpsize = 0; /* also for savecore */
416 static int dodump = 1;
418 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
419 "Try to perform coredump on kernel panic");
432 psize = dev_dpsize(dev);
436 * XXX should clean up checking in dumpsys() to be more like this.
438 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE);
439 if (newdumplo <= LABELSECTOR)
448 static void dump_conf (void *dummy);
456 path = malloc(MNAMELEN, M_TEMP, M_WAITOK);
457 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
458 dev = getdiskbyname(path);
463 if (setdumpdev(dumpdev) != 0)
467 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
470 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
475 ndumpdev = dev2udev(dumpdev);
476 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
477 if (error == 0 && req->newptr != NULL)
478 error = setdumpdev(udev2dev(ndumpdev, 0));
482 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
483 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", "");
486 * Doadump comes here after turning off memory management and
487 * getting on the dump stack, either when called above, or by
488 * the auto-restart code.
497 printf("Dump already in progress, bailing...\n");
502 if (dumpdev == NODEV)
505 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo);
507 error = dev_ddump(dumpdev);
509 printf("succeeded\n");
512 printf("failed, reason: ");
516 printf("device doesn't support a dump routine\n");
520 printf("device bad\n");
524 printf("device not ready\n");
528 printf("area improper\n");
532 printf("i/o error\n");
536 printf("aborted from console\n");
540 printf("unknown, error = %d\n", error);
546 dumpstatus(vm_offset_t addr, off_t count)
550 if (addr % (1024 * 1024) == 0) {
555 printf("%ld ", (long)(count / (1024 * 1024)));
558 if ((c = cncheckc()) == 0x03)
561 printf("[CTRL-C to abort] ");
567 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
568 * and then reboots. If we are called twice, then we avoid trying to sync
569 * the disks as this often leads to recursive panics.
572 panic(const char *fmt, ...)
574 int bootopt, newpanic;
576 static char buf[256];
578 bootopt = RB_AUTOBOOT | RB_DUMP;
581 bootopt |= RB_NOSYNC;
588 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
592 printf("panic: %s\n", buf);
594 /* three seperate prints in case of an unmapped page and trap */
595 printf("mp_lock = %08x; ", mp_lock);
596 printf("cpuid = %d; ", mycpu->gd_cpuid);
597 printf("lapic.id = %08x\n", lapic.id);
601 if (newpanic && trace_on_panic)
602 db_print_backtrace();
603 if (debugger_on_panic)
610 * Support for poweroff delay.
612 #ifndef POWEROFF_DELAY
613 # define POWEROFF_DELAY 5000
615 static int poweroff_delay = POWEROFF_DELAY;
617 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
618 &poweroff_delay, 0, "");
621 poweroff_wait(void *junk, int howto)
623 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
625 DELAY(poweroff_delay * 1000);
629 * Some system processes (e.g. syncer) need to be stopped at appropriate
630 * points in their main loops prior to a system shutdown, so that they
631 * won't interfere with the shutdown process (e.g. by holding a disk buf
632 * to cause sync to fail). For each of these system processes, register
633 * shutdown_kproc() as a handler for one of shutdown events.
635 static int kproc_shutdown_wait = 60;
636 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
637 &kproc_shutdown_wait, 0, "");
640 shutdown_kproc(void *arg, int howto)
649 td = (struct thread *)arg;
650 if ((p = td->td_proc) != NULL) {
651 printf("Waiting (max %d seconds) for system process `%s' to stop...",
652 kproc_shutdown_wait, p->p_comm);
654 printf("Waiting (max %d seconds) for system thread %s to stop...",
655 kproc_shutdown_wait, td->td_comm);
657 error = suspend_kproc(td, kproc_shutdown_wait * hz);
659 if (error == EWOULDBLOCK)
660 printf("timed out\n");