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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 1.62 2008/01/05 13:23:48 corecode Exp $
44 #include "opt_ddb_trace.h"
45 #include "opt_hw_wdog.h"
46 #include "opt_panic.h"
47 #include "opt_show_busybufs.h"
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/eventhandler.h>
55 #include <sys/diskslice.h>
56 #include <sys/reboot.h>
59 #include <sys/fcntl.h> /* FREAD */
60 #include <sys/stat.h> /* S_IFCHR */
61 #include <sys/vnode.h>
62 #include <sys/kernel.h>
63 #include <sys/kerneldump.h>
64 #include <sys/kthread.h>
65 #include <sys/malloc.h>
66 #include <sys/mount.h>
67 #include <sys/queue.h>
68 #include <sys/sysctl.h>
69 #include <sys/vkernel.h>
71 #include <sys/sysproto.h>
72 #include <sys/device.h>
75 #include <sys/kerneldump.h>
76 #include <sys/kern_syscall.h>
77 #include <vm/vm_map.h>
80 #include <sys/thread2.h>
82 #include <sys/mplock2.h>
84 #include <machine/cpu.h>
85 #include <machine/clock.h>
86 #include <machine/md_var.h>
87 #include <machine/smp.h> /* smp_active_mask, cpuid */
88 #include <machine/vmparam.h>
89 #include <machine/thread.h>
91 #include <sys/signalvar.h>
94 #include <dev/misc/gpio/gpio.h>
96 #ifndef PANIC_REBOOT_WAIT_TIME
97 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
101 * Note that stdarg.h and the ANSI style va_start macro is used for both
102 * ANSI and traditional C compilers. We use the machine version to stay
103 * within the confines of the kernel header files.
105 #include <machine/stdarg.h>
109 #ifdef DDB_UNATTENDED
110 int debugger_on_panic = 0;
112 int debugger_on_panic = 1;
114 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
115 &debugger_on_panic, 0, "Run debugger on kernel panic");
118 int trace_on_panic = 1;
120 int trace_on_panic = 0;
122 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
123 &trace_on_panic, 0, "Print stack trace on kernel panic");
126 static int sync_on_panic = 0;
127 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
128 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
130 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
134 * If there is a hardware watchdog, point this at the function needed to
136 * It's needed when the kernel needs to do some lengthy operations.
137 * e.g. in wd.c when dumping core.. It's most annoying to have
138 * your precious core-dump only half written because the wdog kicked in.
140 watchdog_tickle_fn wdog_tickler = NULL;
144 * Variable panicstr contains argument to first call to panic; used as flag
145 * to indicate that the kernel has already called panic.
147 const char *panicstr;
149 int dumping; /* system is dumping */
150 static struct dumperinfo dumper; /* selected dumper */
152 globaldata_t panic_cpu_gd; /* which cpu took the panic */
153 struct lwkt_tokref panic_tokens[LWKT_MAXTOKENS];
154 int panic_tokens_count;
156 int bootverbose = 0; /* note: assignment to force non-bss */
157 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW,
158 &bootverbose, 0, "Verbose kernel messages");
160 int cold = 1; /* note: assignment to force non-bss */
161 int dumplo; /* OBSOLETE - savecore compat */
164 static void boot (int) __dead2;
165 static int setdumpdev (cdev_t dev);
166 static void poweroff_wait (void *, int);
167 static void print_uptime (void);
168 static void shutdown_halt (void *junk, int howto);
169 static void shutdown_panic (void *junk, int howto);
170 static void shutdown_reset (void *junk, int howto);
171 static int shutdown_busycount1(struct buf *bp, void *info);
172 static int shutdown_busycount2(struct buf *bp, void *info);
173 static void shutdown_cleanup_proc(struct proc *p);
175 /* register various local shutdown events */
177 shutdown_conf(void *unused)
179 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
180 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
181 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
182 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
185 SYSINIT(shutdown_conf, SI_BOOT2_MACHDEP, SI_ORDER_ANY, shutdown_conf, NULL)
190 * The system call that results in a reboot
195 sys_reboot(struct reboot_args *uap)
197 struct thread *td = curthread;
200 if ((error = priv_check(td, PRIV_REBOOT)))
210 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
212 static int shutdown_howto = 0;
215 shutdown_nice(int howto)
217 shutdown_howto = howto;
219 /* Send a signal to init(8) and have it shutdown the world */
220 if (initproc != NULL) {
221 ksignal(initproc, SIGINT);
223 /* No init(8) running, so simply reboot */
228 static int waittime = -1;
230 struct thread *dumpthread;
241 if (ts.tv_sec >= 86400) {
242 kprintf("%ldd", ts.tv_sec / 86400);
246 if (f || ts.tv_sec >= 3600) {
247 kprintf("%ldh", ts.tv_sec / 3600);
251 if (f || ts.tv_sec >= 60) {
252 kprintf("%ldm", ts.tv_sec / 60);
256 kprintf("%lds\n", ts.tv_sec);
260 * Go through the rigmarole of shutting down..
261 * this used to be in machdep.c but I'll be dammned if I could see
262 * anything machine dependant in it.
268 * Get rid of any user scheduler baggage and then give
269 * us a high priority.
271 if (curthread->td_release)
272 curthread->td_release(curthread);
273 lwkt_setpri_self(TDPRI_MAX);
275 /* collect extra flags that shutdown_nice might have set */
276 howto |= shutdown_howto;
280 * We really want to shutdown on the BSP. Subsystems such as ACPI
281 * can't power-down the box otherwise.
283 if (smp_active_mask > 1) {
284 kprintf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
286 if (panicstr == NULL && mycpu->gd_cpuid != 0) {
287 kprintf("Switching to cpu #0 for shutdown\n");
288 lwkt_setcpu_self(globaldata_find(0));
292 * Do any callouts that should be done BEFORE syncing the filesystems.
294 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
297 * Try to get rid of any remaining FS references. The calling
298 * process, proc0, and init may still hold references. The
299 * VFS cache subsystem may still hold a root reference to root.
301 * XXX this needs work. We really need to SIGSTOP all remaining
302 * processes in order to avoid blowups due to proc0's filesystem
303 * references going away. For now just make sure that the init
304 * process is stopped.
306 if (panicstr == NULL) {
307 shutdown_cleanup_proc(curproc);
308 shutdown_cleanup_proc(&proc0);
310 if (initproc != curproc) {
311 ksignal(initproc, SIGSTOP);
312 tsleep(boot, 0, "shutdn", hz / 20);
314 shutdown_cleanup_proc(initproc);
316 vfs_cache_setroot(NULL, NULL);
320 * Now sync filesystems
322 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
323 int iter, nbusy, pbusy;
326 kprintf("\nsyncing disks... ");
328 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
331 * With soft updates, some buffers that are
332 * written will be remarked as dirty until other
333 * buffers are written.
335 for (iter = pbusy = 0; iter < 20; iter++) {
336 nbusy = scan_all_buffers(shutdown_busycount1, NULL);
339 kprintf("%d ", nbusy);
345 * Process soft update work queue if buffers don't sync
346 * after 6 iterations by permitting the syncer to run.
351 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
352 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1);
356 * Count only busy local buffers to prevent forcing
357 * a fsck if we're just a client of a wedged NFS server
359 nbusy = scan_all_buffers(shutdown_busycount2, NULL);
362 * Failed to sync all blocks. Indicate this and don't
363 * unmount filesystems (thus forcing an fsck on reboot).
365 kprintf("giving up on %d buffers\n", nbusy);
367 if (debugger_on_panic)
368 Debugger("busy buffer problem");
370 tsleep(boot, 0, "shutdn", hz * 5 + 1);
374 * Unmount filesystems
376 if (panicstr == NULL)
379 tsleep(boot, 0, "shutdn", hz / 10 + 1);
385 * Dump before doing post_sync shutdown ops
388 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) {
393 * Ok, now do things that assume all filesystem activity has
394 * been completed. This will also call the device shutdown
397 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
399 /* Now that we're going to really halt the system... */
400 EVENTHANDLER_INVOKE(shutdown_final, howto);
402 for(;;) ; /* safety against shutdown_reset not working */
407 * Pass 1 - Figure out if there are any busy or dirty buffers still present.
409 * We ignore TMPFS mounts in this pass.
412 shutdown_busycount1(struct buf *bp, void *info)
416 if ((vp = bp->b_vp) != NULL && vp->v_tag == VT_TMPFS)
418 if ((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp) > 0)
420 if ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)
426 * Pass 2 - only run after pass 1 has completed or has given up
428 * We ignore TMPFS, NFS, MFS, and SMBFS mounts in this pass.
431 shutdown_busycount2(struct buf *bp, void *info)
436 * Ignore tmpfs and nfs mounts
438 if ((vp = bp->b_vp) != NULL) {
439 if (vp->v_tag == VT_TMPFS)
441 if (vp->v_tag == VT_NFS)
443 if (vp->v_tag == VT_MFS)
445 if (vp->v_tag == VT_SMBFS)
450 * Only count buffers stuck on I/O, ignore everything else
452 if (((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp)) ||
453 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
455 * Only count buffers undergoing write I/O
456 * on the related vnode.
458 if (bp->b_vp == NULL ||
459 bio_track_active(&bp->b_vp->v_track_write) == 0) {
462 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
464 "%p dev:?, flags:%08x, loffset:%jd, doffset:%jd\n",
466 bp->b_flags, (intmax_t)bp->b_loffset,
467 (intmax_t)bp->b_bio2.bio_offset);
475 * If the shutdown was a clean halt, behave accordingly.
478 shutdown_halt(void *junk, int howto)
480 if (howto & RB_HALT) {
482 kprintf("The operating system has halted.\n");
483 #ifdef _KERNEL_VIRTUAL
486 kprintf("Please press any key to reboot.\n\n");
488 case -1: /* No console, just die */
500 * Check to see if the system paniced, pause and then reboot
501 * according to the specified delay.
504 shutdown_panic(void *junk, int howto)
508 if (howto & RB_DUMP) {
509 if (PANIC_REBOOT_WAIT_TIME != 0) {
510 if (PANIC_REBOOT_WAIT_TIME != -1) {
511 kprintf("Automatic reboot in %d seconds - "
512 "press a key on the console to abort\n",
513 PANIC_REBOOT_WAIT_TIME);
514 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
516 DELAY(1000 * 100); /* 1/10th second */
517 /* Did user type a key? */
518 if (cncheckc() != -1)
524 } else { /* zero time specified - reboot NOW */
527 kprintf("--> Press a key on the console to reboot,\n");
528 kprintf("--> or switch off the system now.\n");
534 * Everything done, now reset
537 shutdown_reset(void *junk, int howto)
539 kprintf("Rebooting...\n");
540 DELAY(1000000); /* wait 1 sec for kprintf's to complete and be read */
541 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
543 /* NOTREACHED */ /* assuming reset worked */
547 * Try to remove FS references in the specified process. This function
548 * is used during shutdown
552 shutdown_cleanup_proc(struct proc *p)
554 struct filedesc *fdp;
559 if ((fdp = p->p_fd) != NULL) {
562 cache_drop(&fdp->fd_ncdir);
567 cache_drop(&fdp->fd_nrdir);
572 cache_drop(&fdp->fd_njdir);
585 pmap_remove_pages(vmspace_pmap(vm),
587 VM_MAX_USER_ADDRESS);
588 vm_map_remove(&vm->vm_map,
590 VM_MAX_USER_ADDRESS);
595 * Magic number for savecore
597 * exported (symorder) and used at least by savecore(8)
599 * Mark it as used so that gcc doesn't optimize it away.
601 __attribute__((__used__))
602 static u_long const dumpmag = 0x8fca0101UL;
604 __attribute__((__used__))
605 static int dumpsize = 0; /* also for savecore */
607 static int dodump = 1;
609 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
610 "Try to perform coredump on kernel panic");
613 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
614 uint64_t dumplen, uint32_t blksz)
616 bzero(kdh, sizeof(*kdh));
617 strncpy(kdh->magic, magic, sizeof(kdh->magic));
618 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
619 kdh->version = htod32(KERNELDUMPVERSION);
620 kdh->architectureversion = htod32(archver);
621 kdh->dumplength = htod64(dumplen);
622 kdh->dumptime = htod64(time_second);
623 kdh->blocksize = htod32(blksz);
624 strncpy(kdh->hostname, hostname, sizeof(kdh->hostname));
625 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
626 if (panicstr != NULL)
627 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
628 kdh->parity = kerneldump_parity(kdh);
632 setdumpdev(cdev_t dev)
638 disk_dumpconf(NULL, 0/*off*/);
643 * We have to open the device before we can perform ioctls on it,
644 * or the slice/label data may not be present. Device opens are
645 * usually tracked by specfs, but the dump device can be set in
646 * early boot and may not be open so this is somewhat of a hack.
648 doopen = (dev->si_sysref.refcnt == 1);
650 error = dev_dopen(dev, FREAD, S_IFCHR, proc0.p_ucred);
654 error = disk_dumpconf(dev, 1/*on*/);
660 static void dump_conf (void *dummy);
662 dump_conf(void *dummy)
667 path = kmalloc(MNAMELEN, M_TEMP, M_WAITOK);
668 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
670 dev = kgetdiskbyname(path);
675 if (setdumpdev(dumpdev) != 0)
679 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
682 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
687 ndumpdev = dev2udev(dumpdev);
688 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
689 if (error == 0 && req->newptr != NULL)
690 error = setdumpdev(udev2dev(ndumpdev, 0));
694 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
695 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,udev_t", "");
698 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
699 * and then reboots. If we are called twice, then we avoid trying to sync
700 * the disks as this often leads to recursive panics.
703 panic(const char *fmt, ...)
705 int bootopt, newpanic;
706 globaldata_t gd = mycpu;
707 thread_t td = gd->gd_curthread;
709 static char buf[256];
713 * If a panic occurs on multiple cpus before the first is able to
714 * halt the other cpus, only one cpu is allowed to take the panic.
715 * Attempt to be verbose about this situation but if the kprintf()
716 * itself panics don't let us overrun the kernel stack.
718 * Be very nasty about descheduling our thread at the lowest
719 * level possible in an attempt to freeze the thread without
720 * inducing further panics.
722 * Bumping gd_trap_nesting_level will also bypass assertions in
723 * lwkt_switch() and allow us to switch away even if we are a
724 * FAST interrupt or IPI.
726 * The setting of panic_cpu_gd also determines how kprintf()
727 * spin-locks itself. DDB can set panic_cpu_gd as well.
730 globaldata_t xgd = panic_cpu_gd;
733 * Someone else got the panic cpu
735 if (xgd && xgd != gd) {
737 ++mycpu->gd_trap_nesting_level;
738 if (mycpu->gd_trap_nesting_level < 25) {
739 kprintf("SECONDARY PANIC ON CPU %d THREAD %p\n",
740 mycpu->gd_cpuid, td);
742 td->td_release = NULL; /* be a grinch */
744 lwkt_deschedule_self(td);
748 /* --mycpu->gd_trap_nesting_level */
755 if (xgd && xgd == gd)
761 if (atomic_cmpset_ptr(&panic_cpu_gd, NULL, gd))
768 * Try to get the system into a working state. Save information
769 * we are about to destroy.
772 if (panicstr == NULL) {
773 bcopy(td->td_toks_array, panic_tokens, sizeof(panic_tokens));
774 panic_tokens_count = td->td_toks_stop - &td->td_toks_base;
776 lwkt_relalltokens(td);
777 td->td_toks_stop = &td->td_toks_base;
782 bootopt = RB_AUTOBOOT | RB_DUMP;
783 if (sync_on_panic == 0)
784 bootopt |= RB_NOSYNC;
787 bootopt |= RB_NOSYNC;
794 * Format the panic string.
797 kvsnprintf(buf, sizeof(buf), fmt, ap);
801 kprintf("panic: %s\n", buf);
803 /* two separate prints in case of an unmapped page and trap */
804 kprintf("cpuid = %d\n", mycpu->gd_cpuid);
807 #if (NGPIO > 0) && defined(ERROR_LED_ON_PANIC)
808 led_switch("error", 1);
811 #if defined(WDOG_DISABLE_ON_PANIC) && defined(WATCHDOG_ENABLE)
816 * Enter the debugger or fall through & dump. Entering the
817 * debugger will stop cpus. If not entering the debugger stop
821 if (newpanic && trace_on_panic)
823 if (debugger_on_panic)
829 stop_cpus(mycpu->gd_other_cpus);
837 * Support for poweroff delay.
839 #ifndef POWEROFF_DELAY
840 # define POWEROFF_DELAY 5000
842 static int poweroff_delay = POWEROFF_DELAY;
844 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
845 &poweroff_delay, 0, "");
848 poweroff_wait(void *junk, int howto)
850 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
852 DELAY(poweroff_delay * 1000);
856 * Some system processes (e.g. syncer) need to be stopped at appropriate
857 * points in their main loops prior to a system shutdown, so that they
858 * won't interfere with the shutdown process (e.g. by holding a disk buf
859 * to cause sync to fail). For each of these system processes, register
860 * shutdown_kproc() as a handler for one of shutdown events.
862 static int kproc_shutdown_wait = 60;
863 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
864 &kproc_shutdown_wait, 0, "");
867 shutdown_kproc(void *arg, int howto)
876 td = (struct thread *)arg;
877 if ((p = td->td_proc) != NULL) {
878 kprintf("Waiting (max %d seconds) for system process `%s' to stop...",
879 kproc_shutdown_wait, p->p_comm);
881 kprintf("Waiting (max %d seconds) for system thread %s to stop...",
882 kproc_shutdown_wait, td->td_comm);
884 error = suspend_kproc(td, kproc_shutdown_wait * hz);
886 if (error == EWOULDBLOCK)
887 kprintf("timed out\n");
889 kprintf("stopped\n");
892 /* Registration of dumpers */
894 set_dumper(struct dumperinfo *di)
897 bzero(&dumper, sizeof(dumper));
901 if (dumper.dumper != NULL)
911 #if defined (_KERNEL_VIRTUAL)
912 /* VKERNELs don't support dumps */
913 kprintf("VKERNEL doesn't support dumps\n");
917 * If there is a dumper registered and we aren't dumping already, call
918 * the machine dependent dumpsys (md_dumpsys) to do the hard work.
920 * XXX: while right now the md_dumpsys() of x86 and x86_64 could be
921 * factored out completely into here, I rather keep them machine
922 * dependent in case we ever add a platform which does not share
923 * the same dumpsys() code, such as arm.
925 if (dumper.dumper != NULL && !dumping) {
931 int dump_stop_usertds = 0;
936 need_user_resched_remote(void *dummy)
943 dump_reactivate_cpus(void)
950 dump_stop_usertds = 1;
955 for (cpu = 0; cpu < ncpus; cpu++) {
956 gd = globaldata_find(cpu);
957 seq = lwkt_send_ipiq(gd, need_user_resched_remote, NULL);
958 lwkt_wait_ipiq(gd, seq);
961 restart_cpus(stopped_cpus);