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38 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
43 #include "opt_ddb_trace.h"
44 #include "opt_ddb_unattended.h"
45 #include "opt_hw_wdog.h"
47 #include "opt_panic.h"
48 #include "opt_show_busybufs.h"
50 #include <sys/param.h>
51 #include <sys/systm.h>
56 #include <sys/disklabel.h>
57 #include <sys/eventhandler.h>
58 #include <sys/kernel.h>
59 #include <sys/kthread.h>
61 #include <sys/malloc.h>
62 #include <sys/mount.h>
64 #include <sys/reboot.h>
65 #include <sys/resourcevar.h>
66 #include <sys/smp.h> /* smp_active */
67 #include <sys/sysctl.h>
68 #include <sys/sysproto.h>
69 #include <sys/vnode.h>
71 #include <machine/pcb.h>
72 #include <machine/md_var.h>
73 #include <machine/smp.h>
75 #include <sys/signalvar.h>
80 #ifndef PANIC_REBOOT_WAIT_TIME
81 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
85 * Note that stdarg.h and the ANSI style va_start macro is used for both
86 * ANSI and traditional C compilers.
88 #include <machine/stdarg.h>
92 int debugger_on_panic = 0;
94 int debugger_on_panic = 1;
96 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
97 &debugger_on_panic, 0, "Run debugger on kernel panic");
100 int trace_on_panic = 1;
102 int trace_on_panic = 0;
104 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
105 &trace_on_panic, 0, "Print stack trace on kernel panic");
108 int sync_on_panic = 1;
109 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
110 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
112 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
116 * If there is a hardware watchdog, point this at the function needed to
118 * It's needed when the kernel needs to do some lengthy operations.
119 * e.g. in wd.c when dumping core.. It's most annoying to have
120 * your precious core-dump only half written because the wdog kicked in.
122 watchdog_tickle_fn wdog_tickler = NULL;
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; /* our selected dumper */
133 static struct pcb dumppcb; /* "You Are Here" sign for dump-debuggers */
135 static void boot(int) __dead2;
136 static void poweroff_wait(void *, int);
137 static void shutdown_halt(void *junk, int howto);
138 static void shutdown_panic(void *junk, int howto);
139 static void shutdown_reset(void *junk, int howto);
141 /* register various local shutdown events */
143 shutdown_conf(void *unused)
145 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
146 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
147 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
148 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
151 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
154 * The system call that results in a reboot
160 reboot(struct thread *td, struct reboot_args *uap)
166 error = mac_check_system_reboot(td->td_ucred, uap->opt);
179 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
181 static int shutdown_howto = 0;
184 shutdown_nice(int howto)
186 shutdown_howto = howto;
188 /* Send a signal to init(8) and have it shutdown the world */
189 if (initproc != NULL) {
191 psignal(initproc, SIGINT);
192 PROC_UNLOCK(initproc);
194 /* No init(8) running, so simply reboot */
199 static int waittime = -1;
210 if (ts.tv_sec >= 86400) {
211 printf("%ldd", (long)ts.tv_sec / 86400);
215 if (f || ts.tv_sec >= 3600) {
216 printf("%ldh", (long)ts.tv_sec / 3600);
220 if (f || ts.tv_sec >= 60) {
221 printf("%ldm", (long)ts.tv_sec / 60);
225 printf("%lds\n", (long)ts.tv_sec);
237 * Go through the rigmarole of shutting down..
238 * this used to be in machdep.c but I'll be dammned if I could see
239 * anything machine dependant in it.
245 /* collect extra flags that shutdown_nice might have set */
246 howto |= shutdown_howto;
249 /* We are out of the debugger now. */
255 printf("boot() called on cpu#%d\n", PCPU_GET(cpuid));
258 * Do any callouts that should be done BEFORE syncing the filesystems.
260 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
263 * Now sync filesystems
265 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
266 register struct buf *bp;
267 int iter, nbusy, pbusy;
271 printf("\nsyncing disks, buffers remaining... ");
273 sync(&thread0, NULL);
276 * With soft updates, some buffers that are
277 * written will be remarked as dirty until other
278 * buffers are written.
280 for (iter = pbusy = 0; iter < 20; iter++) {
282 for (bp = &buf[nbuf]; --bp >= buf; ) {
283 if ((bp->b_flags & B_INVAL) == 0 &&
284 BUF_REFCNT(bp) > 0) {
286 } else if ((bp->b_flags & (B_DELWRI | B_INVAL))
294 printf("%d ", nbusy);
298 sync(&thread0, NULL);
299 if (curthread != NULL) {
301 for (subiter = 0; subiter < 50 * iter; subiter++) {
302 mtx_lock_spin(&sched_lock);
303 curthread->td_proc->p_stats->p_ru.ru_nvcsw++;
304 mi_switch(); /* Allow interrupt threads to run */
305 mtx_unlock_spin(&sched_lock);
314 * Count only busy local buffers to prevent forcing
315 * a fsck if we're just a client of a wedged NFS server
318 for (bp = &buf[nbuf]; --bp >= buf; ) {
319 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
320 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
321 if (bp->b_dev == NODEV) {
322 TAILQ_REMOVE(&mountlist,
323 bp->b_vp->v_mount, mnt_list);
327 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
329 "%d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n",
330 nbusy, devtoname(bp->b_dev),
331 bp->b_flags, (long)bp->b_blkno,
338 * Failed to sync all blocks. Indicate this and don't
339 * unmount filesystems (thus forcing an fsck on reboot).
341 printf("giving up on %d buffers\n", nbusy);
342 DELAY(5000000); /* 5 seconds */
346 * Unmount filesystems
351 DELAY(100000); /* wait for console output to finish */
357 * Ok, now do things that assume all filesystem activity has
360 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
362 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP &&
363 !cold && dumper.dumper != NULL && !dumping)
366 /* Now that we're going to really halt the system... */
367 EVENTHANDLER_INVOKE(shutdown_final, howto);
369 for(;;) ; /* safety against shutdown_reset not working */
374 * If the shutdown was a clean halt, behave accordingly.
377 shutdown_halt(void *junk, int howto)
379 if (howto & RB_HALT) {
381 printf("The operating system has halted.\n");
382 printf("Please press any key to reboot.\n\n");
384 case -1: /* No console, just die */
395 * Check to see if the system paniced, pause and then reboot
396 * according to the specified delay.
399 shutdown_panic(void *junk, int howto)
403 if (howto & RB_DUMP) {
404 if (PANIC_REBOOT_WAIT_TIME != 0) {
405 if (PANIC_REBOOT_WAIT_TIME != -1) {
406 printf("Automatic reboot in %d seconds - "
407 "press a key on the console to abort\n",
408 PANIC_REBOOT_WAIT_TIME);
409 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
411 DELAY(1000 * 100); /* 1/10th second */
412 /* Did user type a key? */
413 if (cncheckc() != -1)
419 } else { /* zero time specified - reboot NOW */
422 printf("--> Press a key on the console to reboot,\n");
423 printf("--> or switch off the system now.\n");
429 * Everything done, now reset
432 shutdown_reset(void *junk, int howto)
434 printf("Rebooting...\n");
435 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
436 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
438 /* NOTREACHED */ /* assuming reset worked */
442 static u_int panic_cpu = NOCPU;
446 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
447 * and then reboots. If we are called twice, then we avoid trying to sync
448 * the disks as this often leads to recursive panics.
453 panic(const char *fmt, ...)
455 struct thread *td = curthread;
456 int bootopt, newpanic;
458 static char buf[256];
462 * We don't want multiple CPU's to panic at the same time, so we
463 * use panic_cpu as a simple spinlock. We have to keep checking
464 * panic_cpu if we are spinning in case the panic on the first
467 if (panic_cpu != PCPU_GET(cpuid))
468 while (atomic_cmpset_int(&panic_cpu, NOCPU,
469 PCPU_GET(cpuid)) == 0)
470 while (panic_cpu != NOCPU)
474 bootopt = RB_AUTOBOOT | RB_DUMP;
477 bootopt |= RB_NOSYNC;
484 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
488 printf("panic: %s\n", buf);
490 /* two separate prints in case of an unmapped page and trap */
491 printf("cpuid = %d; ", PCPU_GET(cpuid));
493 printf("lapic.id = %08x\n", lapic.id);
500 if (newpanic && trace_on_panic)
501 db_print_backtrace();
502 if (debugger_on_panic)
504 #ifdef RESTARTABLE_PANICS
505 /* See if the user aborted the panic, in which case we continue. */
506 if (panicstr == NULL) {
508 atomic_store_rel_int(&panic_cpu, NOCPU);
514 td->td_flags |= TDF_INPANIC;
516 bootopt |= RB_NOSYNC;
521 * Support for poweroff delay.
523 #ifndef POWEROFF_DELAY
524 # define POWEROFF_DELAY 5000
526 static int poweroff_delay = POWEROFF_DELAY;
528 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
529 &poweroff_delay, 0, "");
532 poweroff_wait(void *junk, int howto)
534 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
536 DELAY(poweroff_delay * 1000);
540 * Some system processes (e.g. syncer) need to be stopped at appropriate
541 * points in their main loops prior to a system shutdown, so that they
542 * won't interfere with the shutdown process (e.g. by holding a disk buf
543 * to cause sync to fail). For each of these system processes, register
544 * shutdown_kproc() as a handler for one of shutdown events.
546 static int kproc_shutdown_wait = 60;
547 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
548 &kproc_shutdown_wait, 0, "");
551 kproc_shutdown(void *arg, int howto)
559 p = (struct proc *)arg;
560 printf("Waiting (max %d seconds) for system process `%s' to stop...",
561 kproc_shutdown_wait, p->p_comm);
562 error = kthread_suspend(p, kproc_shutdown_wait * hz);
564 if (error == EWOULDBLOCK)
565 printf("timed out\n");
570 /* Registration of dumpers */
572 set_dumper(struct dumperinfo *di)
575 bzero(&dumper, sizeof dumper);
578 if (dumper.dumper != NULL)
584 #if defined(__powerpc__)
586 dumpsys(struct dumperinfo *di __unused)
589 printf("Kernel dumps not implemented on this architecture\n");