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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"
46 #include <sys/param.h>
47 #include <sys/systm.h>
52 #include <sys/eventhandler.h>
54 #include <sys/kernel.h>
55 #include <sys/kthread.h>
56 #include <sys/malloc.h>
57 #include <sys/mount.h>
60 #include <sys/reboot.h>
61 #include <sys/resourcevar.h>
62 #include <sys/sched.h>
63 #include <sys/smp.h> /* smp_active */
64 #include <sys/sysctl.h>
65 #include <sys/sysproto.h>
67 #include <machine/cpu.h>
68 #include <machine/pcb.h>
69 #include <machine/smp.h>
71 #include <security/mac/mac_framework.h>
74 #include <vm/vm_object.h>
75 #include <vm/vm_page.h>
76 #include <vm/vm_pager.h>
77 #include <vm/swap_pager.h>
79 #include <sys/signalvar.h>
81 #ifndef PANIC_REBOOT_WAIT_TIME
82 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
86 * Note that stdarg.h and the ANSI style va_start macro is used for both
87 * ANSI and traditional C compilers.
89 #include <machine/stdarg.h>
93 int debugger_on_panic = 0;
95 int debugger_on_panic = 1;
97 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
98 &debugger_on_panic, 0, "Run debugger on kernel panic");
101 int trace_on_panic = 1;
103 int trace_on_panic = 0;
105 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
106 &trace_on_panic, 0, "Print stack trace on kernel panic");
109 int sync_on_panic = 0;
110 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
111 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
113 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
116 * Variable panicstr contains argument to first call to panic; used as flag
117 * to indicate that the kernel has already called panic.
119 const char *panicstr;
121 int dumping; /* system is dumping */
122 int rebooting; /* system is rebooting */
123 static struct dumperinfo dumper; /* our selected dumper */
125 /* Context information for dump-debuggers. */
126 static struct pcb dumppcb; /* Registers. */
127 static lwpid_t dumptid; /* Thread ID. */
129 static void boot(int) __dead2;
130 static void poweroff_wait(void *, int);
131 static void shutdown_halt(void *junk, int howto);
132 static void shutdown_panic(void *junk, int howto);
133 static void shutdown_reset(void *junk, int howto);
135 /* register various local shutdown events */
137 shutdown_conf(void *unused)
140 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
142 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
143 SHUTDOWN_PRI_LAST + 100);
144 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
145 SHUTDOWN_PRI_LAST + 100);
146 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
147 SHUTDOWN_PRI_LAST + 200);
150 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
153 * The system call that results in a reboot
159 reboot(struct thread *td, struct reboot_args *uap)
165 error = mac_check_system_reboot(td->td_ucred, uap->opt);
168 error = priv_check(td, PRIV_REBOOT);
178 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
180 static int shutdown_howto = 0;
183 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);
233 * Sometimes people have to call this from the kernel debugger.
234 * (if 'panic' can not dump)
235 * Give them a clue as to why they can't dump.
237 if (dumper.dumper == NULL) {
238 printf("Cannot dump. No dump device defined.\n");
243 dumptid = curthread->td_tid;
249 isbufbusy(struct buf *bp)
251 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
252 BUF_REFCNT(bp) > 0) ||
253 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
259 * Shutdown the system cleanly to prepare for reboot, halt, or power off.
264 static int first_buf_printf = 1;
268 * Bind us to CPU 0 so that all shutdown code runs there. Some
269 * systems don't shutdown properly (i.e., ACPI power off) if we
270 * run on another processor.
272 mtx_lock_spin(&sched_lock);
273 sched_bind(curthread, 0);
274 mtx_unlock_spin(&sched_lock);
275 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
277 /* We're in the process of rebooting. */
280 /* collect extra flags that shutdown_nice might have set */
281 howto |= shutdown_howto;
283 /* We are out of the debugger now. */
287 * Do any callouts that should be done BEFORE syncing the filesystems.
289 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
292 * Now sync filesystems
294 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
295 register struct buf *bp;
296 int iter, nbusy, pbusy;
303 sync(curthread, NULL);
306 * With soft updates, some buffers that are
307 * written will be remarked as dirty until other
308 * buffers are written.
310 for (iter = pbusy = 0; iter < 20; iter++) {
312 for (bp = &buf[nbuf]; --bp >= buf; )
316 if (first_buf_printf)
317 printf("All buffers synced.");
320 if (first_buf_printf) {
321 printf("Syncing disks, buffers remaining... ");
322 first_buf_printf = 0;
324 printf("%d ", nbusy);
328 sync(curthread, NULL);
332 * Drop Giant and spin for a while to allow
333 * interrupt threads to run.
340 * Drop Giant and context switch several times to
341 * allow interrupt threads to run.
344 for (subiter = 0; subiter < 50 * iter; subiter++) {
345 mtx_lock_spin(&sched_lock);
346 mi_switch(SW_VOL, NULL);
347 mtx_unlock_spin(&sched_lock);
355 * Count only busy local buffers to prevent forcing
356 * a fsck if we're just a client of a wedged NFS server
359 for (bp = &buf[nbuf]; --bp >= buf; ) {
362 /* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */
363 if (bp->b_dev == NULL) {
364 TAILQ_REMOVE(&mountlist,
365 bp->b_vp->v_mount, mnt_list);
370 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
372 "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
374 bp->b_flags, (long)bp->b_blkno,
381 * Failed to sync all blocks. Indicate this and don't
382 * unmount filesystems (thus forcing an fsck on reboot).
384 printf("Giving up on %d buffers\n", nbusy);
385 DELAY(5000000); /* 5 seconds */
387 if (!first_buf_printf)
388 printf("Final sync complete\n");
390 * Unmount filesystems
396 DELAY(100000); /* wait for console output to finish */
402 * Ok, now do things that assume all filesystem activity has
405 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
407 /* XXX This doesn't disable interrupts any more. Reconsider? */
410 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
413 /* Now that we're going to really halt the system... */
414 EVENTHANDLER_INVOKE(shutdown_final, howto);
416 for(;;) ; /* safety against shutdown_reset not working */
421 * If the shutdown was a clean halt, behave accordingly.
424 shutdown_halt(void *junk, int howto)
427 if (howto & RB_HALT) {
429 printf("The operating system has halted.\n");
430 printf("Please press any key to reboot.\n\n");
432 case -1: /* No console, just die */
443 * Check to see if the system paniced, pause and then reboot
444 * according to the specified delay.
447 shutdown_panic(void *junk, int howto)
451 if (howto & RB_DUMP) {
452 if (PANIC_REBOOT_WAIT_TIME != 0) {
453 if (PANIC_REBOOT_WAIT_TIME != -1) {
454 printf("Automatic reboot in %d seconds - "
455 "press a key on the console to abort\n",
456 PANIC_REBOOT_WAIT_TIME);
457 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
459 DELAY(1000 * 100); /* 1/10th second */
460 /* Did user type a key? */
461 if (cncheckc() != -1)
467 } else { /* zero time specified - reboot NOW */
470 printf("--> Press a key on the console to reboot,\n");
471 printf("--> or switch off the system now.\n");
477 * Everything done, now reset
480 shutdown_reset(void *junk, int howto)
483 printf("Rebooting...\n");
484 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
485 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
487 /* NOTREACHED */ /* assuming reset worked */
491 static u_int panic_cpu = NOCPU;
495 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
496 * and then reboots. If we are called twice, then we avoid trying to sync
497 * the disks as this often leads to recursive panics.
502 panic(const char *fmt, ...)
504 struct thread *td = curthread;
505 int bootopt, newpanic;
507 static char buf[256];
511 * We don't want multiple CPU's to panic at the same time, so we
512 * use panic_cpu as a simple spinlock. We have to keep checking
513 * panic_cpu if we are spinning in case the panic on the first
516 if (panic_cpu != PCPU_GET(cpuid))
517 while (atomic_cmpset_int(&panic_cpu, NOCPU,
518 PCPU_GET(cpuid)) == 0)
519 while (panic_cpu != NOCPU)
523 bootopt = RB_AUTOBOOT | RB_DUMP;
526 bootopt |= RB_NOSYNC;
534 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
536 printf("panic: %s\n", buf);
544 printf("cpuid = %d\n", PCPU_GET(cpuid));
548 if (newpanic && trace_on_panic)
550 if (debugger_on_panic)
552 #ifdef RESTARTABLE_PANICS
553 /* See if the user aborted the panic, in which case we continue. */
554 if (panicstr == NULL) {
556 atomic_store_rel_int(&panic_cpu, NOCPU);
562 mtx_lock_spin(&sched_lock);
563 td->td_flags |= TDF_INPANIC;
564 mtx_unlock_spin(&sched_lock);
566 bootopt |= RB_NOSYNC;
571 * Support for poweroff delay.
573 #ifndef POWEROFF_DELAY
574 # define POWEROFF_DELAY 5000
576 static int poweroff_delay = POWEROFF_DELAY;
578 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
579 &poweroff_delay, 0, "");
582 poweroff_wait(void *junk, int howto)
585 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
587 DELAY(poweroff_delay * 1000);
591 * Some system processes (e.g. syncer) need to be stopped at appropriate
592 * points in their main loops prior to a system shutdown, so that they
593 * won't interfere with the shutdown process (e.g. by holding a disk buf
594 * to cause sync to fail). For each of these system processes, register
595 * shutdown_kproc() as a handler for one of shutdown events.
597 static int kproc_shutdown_wait = 60;
598 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
599 &kproc_shutdown_wait, 0, "");
602 kproc_shutdown(void *arg, int howto)
605 char procname[MAXCOMLEN + 1];
611 p = (struct proc *)arg;
612 strlcpy(procname, p->p_comm, sizeof(procname));
613 printf("Waiting (max %d seconds) for system process `%s' to stop...",
614 kproc_shutdown_wait, procname);
615 error = kthread_suspend(p, kproc_shutdown_wait * hz);
617 if (error == EWOULDBLOCK)
618 printf("timed out\n");
623 /* Registration of dumpers */
625 set_dumper(struct dumperinfo *di)
629 bzero(&dumper, sizeof dumper);
632 if (dumper.dumper != NULL)
638 #if defined(__powerpc__)
640 dumpsys(struct dumperinfo *di __unused)
643 printf("Kernel dumps not implemented on this architecture\n");