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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 1.11 2003/08/26 21:09:02 rob Exp $
44 #include "opt_hw_wdog.h"
45 #include "opt_panic.h"
46 #include "opt_show_busybufs.h"
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/eventhandler.h>
52 #include <sys/disklabel.h>
53 #include <sys/reboot.h>
55 #include <sys/vnode.h>
56 #include <sys/kernel.h>
57 #include <sys/kthread.h>
58 #include <sys/malloc.h>
59 #include <sys/mount.h>
60 #include <sys/queue.h>
61 #include <sys/sysctl.h>
63 #include <sys/sysproto.h>
64 #include <sys/device.h>
68 #include <machine/pcb.h>
69 #include <machine/clock.h>
70 #include <machine/md_var.h>
71 #include <machine/smp.h> /* smp_active, cpuid */
73 #include <sys/signalvar.h>
75 #ifndef PANIC_REBOOT_WAIT_TIME
76 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
80 * Note that stdarg.h and the ANSI style va_start macro is used for both
81 * ANSI and traditional C compilers.
83 #include <machine/stdarg.h>
87 int debugger_on_panic = 0;
89 int debugger_on_panic = 1;
91 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
92 &debugger_on_panic, 0, "Run debugger on kernel panic");
95 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
99 * If there is a hardware watchdog, point this at the function needed to
101 * It's needed when the kernel needs to do some lengthy operations.
102 * e.g. in wd.c when dumping core.. It's most annoying to have
103 * your precious core-dump only half written because the wdog kicked in.
105 watchdog_tickle_fn wdog_tickler = NULL;
109 * Variable panicstr contains argument to first call to panic; used as flag
110 * to indicate that the kernel has already called panic.
112 const char *panicstr;
114 int dumping; /* system is dumping */
116 static void boot (int) __dead2;
117 static void dumpsys (void);
118 static int setdumpdev (dev_t dev);
119 static void poweroff_wait (void *, int);
120 static void print_uptime (void);
121 static void shutdown_halt (void *junk, int howto);
122 static void shutdown_panic (void *junk, int howto);
123 static void shutdown_reset (void *junk, int howto);
125 /* register various local shutdown events */
127 shutdown_conf(void *unused)
129 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
130 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
131 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
132 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
135 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
140 * The system call that results in a reboot
143 reboot(struct reboot_args *uap)
145 struct thread *td = curthread;
148 if ((error = suser(td)))
156 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
158 static int shutdown_howto = 0;
161 shutdown_nice(int howto)
163 shutdown_howto = howto;
165 /* Send a signal to init(8) and have it shutdown the world */
166 if (initproc != NULL) {
167 psignal(initproc, SIGINT);
169 /* No init(8) running, so simply reboot */
174 static int waittime = -1;
175 static struct pcb dumppcb;
186 if (ts.tv_sec >= 86400) {
187 printf("%ldd", ts.tv_sec / 86400);
191 if (f || ts.tv_sec >= 3600) {
192 printf("%ldh", ts.tv_sec / 3600);
196 if (f || ts.tv_sec >= 60) {
197 printf("%ldm", ts.tv_sec / 60);
201 printf("%lds\n", ts.tv_sec);
205 * Go through the rigmarole of shutting down..
206 * this used to be in machdep.c but I'll be dammned if I could see
207 * anything machine dependant in it.
213 /* collect extra flags that shutdown_nice might have set */
214 howto |= shutdown_howto;
218 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
222 * Do any callouts that should be done BEFORE syncing the filesystems.
224 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
227 * Now sync filesystems
229 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
231 int iter, nbusy, pbusy;
234 printf("\nsyncing disks... ");
236 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
239 * With soft updates, some buffers that are
240 * written will be remarked as dirty until other
241 * buffers are written.
243 for (iter = pbusy = 0; iter < 20; iter++) {
245 for (bp = &buf[nbuf]; --bp >= buf; ) {
246 if ((bp->b_flags & B_INVAL) == 0 &&
247 BUF_REFCNT(bp) > 0) {
249 } else if ((bp->b_flags & (B_DELWRI | B_INVAL))
257 printf("%d ", nbusy);
261 if (iter > 5 && bioops.io_sync)
262 (*bioops.io_sync)(NULL);
263 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
268 * Count only busy local buffers to prevent forcing
269 * a fsck if we're just a client of a wedged NFS server
272 for (bp = &buf[nbuf]; --bp >= buf; ) {
273 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
274 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
275 if (bp->b_dev == NODEV) {
276 TAILQ_REMOVE(&mountlist,
277 bp->b_vp->v_mount, mnt_list);
281 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
283 "%p %d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n",
284 bp, nbusy, devtoname(bp->b_dev),
285 bp->b_flags, (long)bp->b_blkno,
292 * Failed to sync all blocks. Indicate this and don't
293 * unmount filesystems (thus forcing an fsck on reboot).
295 printf("giving up on %d buffers\n", nbusy);
296 DELAY(5000000); /* 5 seconds */
300 * Unmount filesystems
305 DELAY(100000); /* wait for console output to finish */
311 * Ok, now do things that assume all filesystem activity has
314 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
316 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold)
319 /* Now that we're going to really halt the system... */
320 EVENTHANDLER_INVOKE(shutdown_final, howto);
322 for(;;) ; /* safety against shutdown_reset not working */
327 * If the shutdown was a clean halt, behave accordingly.
330 shutdown_halt(void *junk, int howto)
332 if (howto & RB_HALT) {
334 printf("The operating system has halted.\n");
335 printf("Please press any key to reboot.\n\n");
337 case -1: /* No console, just die */
348 * Check to see if the system paniced, pause and then reboot
349 * according to the specified delay.
352 shutdown_panic(void *junk, int howto)
356 if (howto & RB_DUMP) {
357 if (PANIC_REBOOT_WAIT_TIME != 0) {
358 if (PANIC_REBOOT_WAIT_TIME != -1) {
359 printf("Automatic reboot in %d seconds - "
360 "press a key on the console to abort\n",
361 PANIC_REBOOT_WAIT_TIME);
362 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
364 DELAY(1000 * 100); /* 1/10th second */
365 /* Did user type a key? */
366 if (cncheckc() != -1)
372 } else { /* zero time specified - reboot NOW */
375 printf("--> Press a key on the console to reboot,\n");
376 printf("--> or switch off the system now.\n");
382 * Everything done, now reset
385 shutdown_reset(void *junk, int howto)
387 printf("Rebooting...\n");
388 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
389 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
391 /* NOTREACHED */ /* assuming reset worked */
395 * Magic number for savecore
397 * exported (symorder) and used at least by savecore(8)
400 static u_long const dumpmag = 0x8fca0101UL;
402 static int dumpsize = 0; /* also for savecore */
404 static int dodump = 1;
406 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
407 "Try to perform coredump on kernel panic");
420 psize = dev_dpsize(dev);
424 * XXX should clean up checking in dumpsys() to be more like this.
426 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE);
427 if (newdumplo <= LABELSECTOR)
436 static void dump_conf (void *dummy);
444 path = malloc(MNAMELEN, M_TEMP, M_WAITOK);
445 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
446 dev = getdiskbyname(path);
451 if (setdumpdev(dumpdev) != 0)
455 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
458 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
463 ndumpdev = dev2udev(dumpdev);
464 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
465 if (error == 0 && req->newptr != NULL)
466 error = setdumpdev(udev2dev(ndumpdev, 0));
470 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
471 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", "");
474 * Doadump comes here after turning off memory management and
475 * getting on the dump stack, either when called above, or by
476 * the auto-restart code.
485 printf("Dump already in progress, bailing...\n");
490 if (dumpdev == NODEV)
493 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo);
495 error = dev_ddump(dumpdev);
497 printf("succeeded\n");
500 printf("failed, reason: ");
504 printf("device doesn't support a dump routine\n");
508 printf("device bad\n");
512 printf("device not ready\n");
516 printf("area improper\n");
520 printf("i/o error\n");
524 printf("aborted from console\n");
528 printf("unknown, error = %d\n", error);
534 dumpstatus(vm_offset_t addr, off_t count)
538 if (addr % (1024 * 1024) == 0) {
543 printf("%ld ", (long)(count / (1024 * 1024)));
546 if ((c = cncheckc()) == 0x03)
549 printf("[CTRL-C to abort] ");
555 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
556 * and then reboots. If we are called twice, then we avoid trying to sync
557 * the disks as this often leads to recursive panics.
560 panic(const char *fmt, ...)
564 static char buf[256];
566 bootopt = RB_AUTOBOOT | RB_DUMP;
568 bootopt |= RB_NOSYNC;
573 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
577 printf("panic: %s\n", buf);
579 /* three seperate prints in case of an unmapped page and trap */
580 printf("mp_lock = %08x; ", mp_lock);
581 printf("cpuid = %d; ", mycpu->gd_cpuid);
582 printf("lapic.id = %08x\n", lapic.id);
586 if (debugger_on_panic)
593 * Support for poweroff delay.
595 #ifndef POWEROFF_DELAY
596 # define POWEROFF_DELAY 5000
598 static int poweroff_delay = POWEROFF_DELAY;
600 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
601 &poweroff_delay, 0, "");
604 poweroff_wait(void *junk, int howto)
606 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
608 DELAY(poweroff_delay * 1000);
612 * Some system processes (e.g. syncer) need to be stopped at appropriate
613 * points in their main loops prior to a system shutdown, so that they
614 * won't interfere with the shutdown process (e.g. by holding a disk buf
615 * to cause sync to fail). For each of these system processes, register
616 * shutdown_kproc() as a handler for one of shutdown events.
618 static int kproc_shutdown_wait = 60;
619 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
620 &kproc_shutdown_wait, 0, "");
623 shutdown_kproc(void *arg, int howto)
632 td = (struct thread *)arg;
633 if ((p = td->td_proc) != NULL) {
634 printf("Waiting (max %d seconds) for system process `%s' to stop...",
635 kproc_shutdown_wait, p->p_comm);
637 printf("Waiting (max %d seconds) for system thread %s to stop...",
638 kproc_shutdown_wait, td->td_comm);
640 error = suspend_kproc(td, kproc_shutdown_wait * hz);
642 if (error == EWOULDBLOCK)
643 printf("timed out\n");