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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 1.55 2007/05/27 23:28:29 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/diskslice.h>
54 #include <sys/reboot.h>
56 #include <sys/fcntl.h> /* FREAD */
57 #include <sys/stat.h> /* S_IFCHR */
58 #include <sys/vnode.h>
59 #include <sys/kernel.h>
60 #include <sys/kthread.h>
61 #include <sys/malloc.h>
62 #include <sys/mount.h>
63 #include <sys/queue.h>
64 #include <sys/sysctl.h>
65 #include <sys/vkernel.h>
67 #include <sys/sysproto.h>
68 #include <sys/device.h>
71 #include <sys/kern_syscall.h>
72 #include <vm/vm_map.h>
75 #include <sys/thread2.h>
78 #include <machine/pcb.h>
79 #include <machine/clock.h>
80 #include <machine/md_var.h>
81 #include <machine/smp.h> /* smp_active_mask, cpuid */
82 #include <machine/vmparam.h>
84 #include <sys/signalvar.h>
86 #ifndef PANIC_REBOOT_WAIT_TIME
87 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
91 * Note that stdarg.h and the ANSI style va_start macro is used for both
92 * ANSI and traditional C compilers. We use the machine version to stay
93 * within the confines of the kernel header files.
95 #include <machine/stdarg.h>
99 int debugger_on_panic = 0;
101 int debugger_on_panic = 1;
103 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
104 &debugger_on_panic, 0, "Run debugger on kernel panic");
106 extern void db_print_backtrace(void);
109 int trace_on_panic = 1;
111 int trace_on_panic = 0;
113 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
114 &trace_on_panic, 0, "Print stack trace on kernel panic");
117 static int sync_on_panic = 1;
118 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
119 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
121 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
125 * If there is a hardware watchdog, point this at the function needed to
127 * It's needed when the kernel needs to do some lengthy operations.
128 * e.g. in wd.c when dumping core.. It's most annoying to have
129 * your precious core-dump only half written because the wdog kicked in.
131 watchdog_tickle_fn wdog_tickler = NULL;
135 * Variable panicstr contains argument to first call to panic; used as flag
136 * to indicate that the kernel has already called panic.
138 const char *panicstr;
140 int dumping; /* system is dumping */
142 u_int panic_cpu_interlock; /* panic interlock */
143 globaldata_t panic_cpu_gd; /* which cpu took the panic */
146 int bootverbose = 0; /* note: assignment to force non-bss */
147 int cold = 1; /* note: assignment to force non-bss */
148 int dumplo; /* OBSOLETE - savecore compat */
151 static void boot (int) __dead2;
152 static void dumpsys (void);
153 static int setdumpdev (cdev_t dev);
154 static void poweroff_wait (void *, int);
155 static void print_uptime (void);
156 static void shutdown_halt (void *junk, int howto);
157 static void shutdown_panic (void *junk, int howto);
158 static void shutdown_reset (void *junk, int howto);
159 static int shutdown_busycount1(struct buf *bp, void *info);
160 static int shutdown_busycount2(struct buf *bp, void *info);
161 static void shutdown_cleanup_proc(struct proc *p);
163 /* register various local shutdown events */
165 shutdown_conf(void *unused)
167 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
168 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
169 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
170 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
173 SYSINIT(shutdown_conf, SI_BOOT2_MACHDEP, SI_ORDER_ANY, shutdown_conf, NULL)
178 * The system call that results in a reboot
181 sys_reboot(struct reboot_args *uap)
183 struct thread *td = curthread;
186 if ((error = suser(td)))
194 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
196 static int shutdown_howto = 0;
199 shutdown_nice(int howto)
201 shutdown_howto = howto;
203 /* Send a signal to init(8) and have it shutdown the world */
204 if (initproc != NULL) {
205 ksignal(initproc, SIGINT);
207 /* No init(8) running, so simply reboot */
212 static int waittime = -1;
213 static struct thread *dumpthread;
214 static struct pcb dumppcb;
225 if (ts.tv_sec >= 86400) {
226 kprintf("%ldd", ts.tv_sec / 86400);
230 if (f || ts.tv_sec >= 3600) {
231 kprintf("%ldh", ts.tv_sec / 3600);
235 if (f || ts.tv_sec >= 60) {
236 kprintf("%ldm", ts.tv_sec / 60);
240 kprintf("%lds\n", ts.tv_sec);
244 * Go through the rigmarole of shutting down..
245 * this used to be in machdep.c but I'll be dammned if I could see
246 * anything machine dependant in it.
252 * Get rid of any user scheduler baggage and then give
253 * us a high priority.
255 if (curthread->td_release)
256 curthread->td_release(curthread);
257 lwkt_setpri_self(TDPRI_MAX);
259 /* collect extra flags that shutdown_nice might have set */
260 howto |= shutdown_howto;
264 * We really want to shutdown on the BSP. Subsystems such as ACPI
265 * can't power-down the box otherwise.
267 if (smp_active_mask > 1) {
268 kprintf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
270 if (panicstr == NULL && mycpu->gd_cpuid != 0) {
271 kprintf("Switching to cpu #0 for shutdown\n");
272 lwkt_setcpu_self(globaldata_find(0));
276 * Do any callouts that should be done BEFORE syncing the filesystems.
278 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
281 * Try to get rid of any remaining FS references. The calling
282 * process, proc0, and init may still hold references. The
283 * VFS cache subsystem may still hold a root reference to root.
285 * XXX this needs work. We really need to SIGSTOP all remaining
286 * processes in order to avoid blowups due to proc0's filesystem
287 * references going away. For now just make sure that the init
288 * process is stopped.
290 if (panicstr == NULL) {
291 shutdown_cleanup_proc(curproc);
292 shutdown_cleanup_proc(&proc0);
294 if (initproc != curproc) {
295 ksignal(initproc, SIGSTOP);
296 tsleep(boot, 0, "shutdn", hz / 20);
298 shutdown_cleanup_proc(initproc);
300 vfs_cache_setroot(NULL, NULL);
304 * Now sync filesystems
306 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
307 int iter, nbusy, pbusy;
310 kprintf("\nsyncing disks... ");
312 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
315 * With soft updates, some buffers that are
316 * written will be remarked as dirty until other
317 * buffers are written.
319 for (iter = pbusy = 0; iter < 20; iter++) {
320 nbusy = scan_all_buffers(shutdown_busycount1, NULL);
323 kprintf("%d ", nbusy);
329 * Process soft update work queue if buffers don't sync
330 * after 6 iterations by permitting the syncer to run.
332 if (iter > 5 && bioops.io_sync)
333 (*bioops.io_sync)(NULL);
334 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
335 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1);
339 * Count only busy local buffers to prevent forcing
340 * a fsck if we're just a client of a wedged NFS server
342 nbusy = scan_all_buffers(shutdown_busycount2, NULL);
345 * Failed to sync all blocks. Indicate this and don't
346 * unmount filesystems (thus forcing an fsck on reboot).
348 kprintf("giving up on %d buffers\n", nbusy);
350 Debugger("busy buffer problem");
352 tsleep(boot, 0, "shutdn", hz * 5 + 1);
356 * Unmount filesystems
358 if (panicstr == NULL)
361 tsleep(boot, 0, "shutdn", hz / 10 + 1);
367 * Ok, now do things that assume all filesystem activity has
370 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
372 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold)
375 /* Now that we're going to really halt the system... */
376 EVENTHANDLER_INVOKE(shutdown_final, howto);
378 for(;;) ; /* safety against shutdown_reset not working */
383 shutdown_busycount1(struct buf *bp, void *info)
385 if ((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp) > 0)
387 if ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)
393 shutdown_busycount2(struct buf *bp, void *info)
395 if (((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp)) ||
396 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
398 * Only count buffers undergoing write I/O
399 * on the related vnode.
401 if (bp->b_vp == NULL ||
402 bp->b_vp->v_track_write.bk_active == 0) {
405 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
407 "%p dev:?, flags:%08x, loffset:%lld, doffset:%lld\n",
409 bp->b_flags, bp->b_loffset,
410 bp->b_bio2.bio_offset);
418 * If the shutdown was a clean halt, behave accordingly.
421 shutdown_halt(void *junk, int howto)
423 if (howto & RB_HALT) {
425 kprintf("The operating system has halted.\n");
426 #ifdef _KERNEL_VIRTUAL
429 kprintf("Please press any key to reboot.\n\n");
431 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 kprintf("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 kprintf("--> Press a key on the console to reboot,\n");
471 kprintf("--> or switch off the system now.\n");
477 * Everything done, now reset
480 shutdown_reset(void *junk, int howto)
482 kprintf("Rebooting...\n");
483 DELAY(1000000); /* wait 1 sec for kprintf's to complete and be read */
484 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
486 /* NOTREACHED */ /* assuming reset worked */
490 * Try to remove FS references in the specified process. This function
491 * is used during shutdown
495 shutdown_cleanup_proc(struct proc *p)
497 struct filedesc *fdp;
502 if ((fdp = p->p_fd) != NULL) {
505 cache_drop(&fdp->fd_ncdir);
510 cache_drop(&fdp->fd_nrdir);
515 cache_drop(&fdp->fd_njdir);
528 pmap_remove_pages(vmspace_pmap(vm),
530 VM_MAX_USER_ADDRESS);
531 vm_map_remove(&vm->vm_map,
533 VM_MAX_USER_ADDRESS);
538 * Magic number for savecore
540 * exported (symorder) and used at least by savecore(8)
542 * Mark it as used so that gcc doesn't optimize it away.
544 __attribute__((__used__))
545 static u_long const dumpmag = 0x8fca0101UL;
547 static int dumpsize = 0; /* also for savecore */
549 static int dodump = 1;
551 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
552 "Try to perform coredump on kernel panic");
555 setdumpdev(cdev_t dev)
557 struct partinfo pinfo;
566 bzero(&pinfo, sizeof(pinfo));
569 * We have to open the device before we can perform ioctls on it,
570 * or the slice/label data may not be present. Device opens are
571 * usually tracked by specfs, but the dump device can be set in
572 * early boot and may not be open so this is somewhat of a hack.
574 doopen = (dev->si_sysref.refcnt == 1);
576 error = dev_dopen(dev, FREAD, S_IFCHR, proc0.p_ucred);
580 error = dev_dioctl(dev, DIOCGPART, (void *)&pinfo, 0, proc0.p_ucred);
582 dev_dclose(dev, FREAD, S_IFCHR);
583 if (error || pinfo.media_blocks == 0 || pinfo.media_blksize == 0)
586 newdumplo = pinfo.media_blocks -
587 ((u_int64_t)Maxmem * PAGE_SIZE / DEV_BSIZE);
588 if ((int64_t)newdumplo < (int64_t)pinfo.skip_bsdlabel)
591 dumplo64 = newdumplo;
597 static void dump_conf (void *dummy);
599 dump_conf(void *dummy)
604 path = kmalloc(MNAMELEN, M_TEMP, M_WAITOK);
605 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
606 dev = kgetdiskbyname(path);
611 if (setdumpdev(dumpdev) != 0)
615 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
618 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
623 ndumpdev = dev2udev(dumpdev);
624 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
625 if (error == 0 && req->newptr != NULL)
626 error = setdumpdev(udev2dev(ndumpdev, 0));
630 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
631 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,udev_t", "");
634 * Doadump comes here after turning off memory management and
635 * getting on the dump stack, either when called above, or by
636 * the auto-restart code.
644 dumpthread = curthread;
646 kprintf("Dump already in progress, bailing...\n");
654 kprintf("\ndumping to dev %s, blockno %lld\n",
655 devtoname(dumpdev), dumplo64);
657 error = dev_ddump(dumpdev);
659 kprintf("succeeded\n");
662 kprintf("failed, reason: ");
666 kprintf("device doesn't support a dump routine\n");
670 kprintf("device bad\n");
674 kprintf("device not ready\n");
678 kprintf("area improper\n");
682 kprintf("i/o error\n");
686 kprintf("aborted from console\n");
690 kprintf("unknown, error = %d\n", error);
696 dumpstatus(vm_offset_t addr, off_t count)
700 if (addr % (1024 * 1024) == 0) {
705 kprintf("%ld ", (long)(count / (1024 * 1024)));
708 if ((c = cncheckc()) == 0x03)
711 kprintf("[CTRL-C to abort] ");
717 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
718 * and then reboots. If we are called twice, then we avoid trying to sync
719 * the disks as this often leads to recursive panics.
722 panic(const char *fmt, ...)
724 int bootopt, newpanic;
726 static char buf[256];
730 * If a panic occurs on multiple cpus before the first is able to
731 * halt the other cpus, only one cpu is allowed to take the panic.
732 * Attempt to be verbose about this situation but if the kprintf()
733 * itself panics don't let us overrun the kernel stack.
735 * Be very nasty about descheduling our thread at the lowest
736 * level possible in an attempt to freeze the thread without
737 * inducing further panics.
739 * Bumping gd_trap_nesting_level will also bypass assertions in
740 * lwkt_switch() and allow us to switch away even if we are a
741 * FAST interrupt or IPI.
743 if (atomic_poll_acquire_int(&panic_cpu_interlock)) {
744 panic_cpu_gd = mycpu;
745 } else if (panic_cpu_gd != mycpu) {
747 ++mycpu->gd_trap_nesting_level;
748 if (mycpu->gd_trap_nesting_level < 25) {
749 kprintf("SECONDARY PANIC ON CPU %d THREAD %p\n",
750 mycpu->gd_cpuid, curthread);
752 curthread->td_release = NULL; /* be a grinch */
754 lwkt_deschedule_self(curthread);
758 /* --mycpu->gd_trap_nesting_level */
762 bootopt = RB_AUTOBOOT | RB_DUMP;
763 if (sync_on_panic == 0)
764 bootopt |= RB_NOSYNC;
767 bootopt |= RB_NOSYNC;
774 kvsnprintf(buf, sizeof(buf), fmt, ap);
778 kprintf("panic: %s\n", buf);
780 /* three separate prints in case of an unmapped page and trap */
781 kprintf("mp_lock = %08x; ", mp_lock);
782 kprintf("cpuid = %d; ", mycpu->gd_cpuid);
783 kprintf("lapic.id = %08x\n", lapic.id);
787 if (newpanic && trace_on_panic)
788 db_print_backtrace();
789 if (debugger_on_panic)
796 * Support for poweroff delay.
798 #ifndef POWEROFF_DELAY
799 # define POWEROFF_DELAY 5000
801 static int poweroff_delay = POWEROFF_DELAY;
803 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
804 &poweroff_delay, 0, "");
807 poweroff_wait(void *junk, int howto)
809 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
811 DELAY(poweroff_delay * 1000);
815 * Some system processes (e.g. syncer) need to be stopped at appropriate
816 * points in their main loops prior to a system shutdown, so that they
817 * won't interfere with the shutdown process (e.g. by holding a disk buf
818 * to cause sync to fail). For each of these system processes, register
819 * shutdown_kproc() as a handler for one of shutdown events.
821 static int kproc_shutdown_wait = 60;
822 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
823 &kproc_shutdown_wait, 0, "");
826 shutdown_kproc(void *arg, int howto)
835 td = (struct thread *)arg;
836 if ((p = td->td_proc) != NULL) {
837 kprintf("Waiting (max %d seconds) for system process `%s' to stop...",
838 kproc_shutdown_wait, p->p_comm);
840 kprintf("Waiting (max %d seconds) for system thread %s to stop...",
841 kproc_shutdown_wait, td->td_comm);
843 error = suspend_kproc(td, kproc_shutdown_wait * hz);
845 if (error == EWOULDBLOCK)
846 kprintf("timed out\n");
848 kprintf("stopped\n");