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34 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
35 * $FreeBSD: src/sys/kern/kern_shutdown.c,v 1.72.2.12 2002/02/21 19:15:10 dillon Exp $
39 #include "opt_ddb_trace.h"
40 #include "opt_panic.h"
41 #include "opt_show_busybufs.h"
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/eventhandler.h>
49 #include <sys/diskslice.h>
50 #include <sys/reboot.h>
53 #include <sys/fcntl.h> /* FREAD */
54 #include <sys/stat.h> /* S_IFCHR */
55 #include <sys/vnode.h>
56 #include <sys/kernel.h>
57 #include <sys/kerneldump.h>
58 #include <sys/kthread.h>
59 #include <sys/malloc.h>
60 #include <sys/mount.h>
61 #include <sys/queue.h>
62 #include <sys/sysctl.h>
63 #include <sys/vkernel.h>
65 #include <sys/sysproto.h>
66 #include <sys/device.h>
70 #include <sys/kern_syscall.h>
71 #include <vm/vm_map.h>
74 #include <sys/thread2.h>
76 #include <sys/mplock2.h>
78 #include <machine/cpu.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>
83 #include <machine/thread.h>
85 #include <sys/signalvar.h>
88 #include <dev/misc/gpio/gpio.h>
90 #ifndef PANIC_REBOOT_WAIT_TIME
91 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
95 * Note that stdarg.h and the ANSI style va_start macro is used for both
96 * ANSI and traditional C compilers. We use the machine version to stay
97 * within the confines of the kernel header files.
99 #include <machine/stdarg.h>
103 #ifdef DDB_UNATTENDED
104 int debugger_on_panic = 0;
106 int debugger_on_panic = 1;
108 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
109 &debugger_on_panic, 0, "Run debugger on kernel panic");
112 int trace_on_panic = 1;
114 int trace_on_panic = 0;
116 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
117 &trace_on_panic, 0, "Print stack trace on kernel panic");
120 static int sync_on_panic = 0;
121 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
122 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
124 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
127 * Variable panicstr contains argument to first call to panic; used as flag
128 * to indicate that the kernel has already called panic.
130 const char *panicstr;
132 int dumping; /* system is dumping */
133 static struct dumperinfo dumper; /* selected dumper */
135 globaldata_t panic_cpu_gd; /* which cpu took the panic */
136 struct lwkt_tokref panic_tokens[LWKT_MAXTOKENS];
137 int panic_tokens_count;
139 int bootverbose = 0; /* note: assignment to force non-bss */
140 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW,
141 &bootverbose, 0, "Verbose kernel messages");
143 int cold = 1; /* note: assignment to force non-bss */
144 int dumplo; /* OBSOLETE - savecore compat */
147 static void boot (int) __dead2;
148 static int setdumpdev (cdev_t dev);
149 static void poweroff_wait (void *, int);
150 static void print_uptime (void);
151 static void shutdown_halt (void *junk, int howto);
152 static void shutdown_panic (void *junk, int howto);
153 static void shutdown_reset (void *junk, int howto);
154 static int shutdown_busycount1(struct buf *bp, void *info);
155 static int shutdown_busycount2(struct buf *bp, void *info);
156 static void shutdown_cleanup_proc(struct proc *p);
158 /* register various local shutdown events */
160 shutdown_conf(void *unused)
162 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
163 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
164 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
165 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
168 SYSINIT(shutdown_conf, SI_BOOT2_MACHDEP, SI_ORDER_ANY, shutdown_conf, NULL);
173 * The system call that results in a reboot
178 sys_reboot(struct reboot_args *uap)
180 struct thread *td = curthread;
183 if ((error = priv_check(td, PRIV_REBOOT)))
193 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
195 static int shutdown_howto = 0;
198 shutdown_nice(int howto)
200 shutdown_howto = howto;
202 /* Send a signal to init(8) and have it shutdown the world */
203 if (initproc != NULL) {
204 ksignal(initproc, SIGINT);
206 /* No init(8) running, so simply reboot */
211 static int waittime = -1;
213 struct thread *dumpthread;
224 if (ts.tv_sec >= 86400) {
225 kprintf("%ldd", ts.tv_sec / 86400);
229 if (f || ts.tv_sec >= 3600) {
230 kprintf("%ldh", ts.tv_sec / 3600);
234 if (f || ts.tv_sec >= 60) {
235 kprintf("%ldm", ts.tv_sec / 60);
239 kprintf("%lds\n", ts.tv_sec);
243 * Go through the rigmarole of shutting down..
244 * this used to be in machdep.c but I'll be dammned if I could see
245 * anything machine dependant in it.
251 * Get rid of any user scheduler baggage and then give
252 * us a high priority.
254 if (curthread->td_release)
255 curthread->td_release(curthread);
256 lwkt_setpri_self(TDPRI_MAX);
258 /* collect extra flags that shutdown_nice might have set */
259 howto |= shutdown_howto;
262 * We really want to shutdown on the BSP. Subsystems such as ACPI
263 * can't power-down the box otherwise.
265 if (!CPUMASK_ISUP(smp_active_mask)) {
266 kprintf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
268 if (panicstr == NULL && mycpu->gd_cpuid != 0) {
269 kprintf("Switching to cpu #0 for shutdown\n");
270 lwkt_setcpu_self(globaldata_find(0));
273 * Do any callouts that should be done BEFORE syncing the filesystems.
275 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
278 * Try to get rid of any remaining FS references. The calling
279 * process, proc0, and init may still hold references. The
280 * VFS cache subsystem may still hold a root reference to root.
282 * XXX this needs work. We really need to SIGSTOP all remaining
283 * processes in order to avoid blowups due to proc0's filesystem
284 * references going away. For now just make sure that the init
285 * process is stopped.
287 if (panicstr == NULL) {
288 shutdown_cleanup_proc(curproc);
289 shutdown_cleanup_proc(&proc0);
291 if (initproc != curproc) {
292 ksignal(initproc, SIGSTOP);
293 tsleep(boot, 0, "shutdn", hz / 20);
295 shutdown_cleanup_proc(initproc);
297 vfs_cache_setroot(NULL, NULL);
301 * Now sync filesystems
303 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
304 int iter, nbusy, pbusy;
307 kprintf("\nsyncing disks... ");
309 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
312 * With soft updates, some buffers that are
313 * written will be remarked as dirty until other
314 * buffers are written.
316 for (iter = pbusy = 0; iter < 20; iter++) {
317 nbusy = scan_all_buffers(shutdown_busycount1, NULL);
320 kprintf("%d ", nbusy);
326 * Process soft update work queue if buffers don't sync
327 * after 6 iterations by permitting the syncer to run.
332 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
333 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1);
337 * Count only busy local buffers to prevent forcing
338 * a fsck if we're just a client of a wedged NFS server
340 nbusy = scan_all_buffers(shutdown_busycount2, NULL);
343 * Failed to sync all blocks. Indicate this and don't
344 * unmount filesystems (thus forcing an fsck on reboot).
346 kprintf("giving up on %d buffers\n", nbusy);
348 if (debugger_on_panic)
349 Debugger("busy buffer problem");
351 tsleep(boot, 0, "shutdn", hz * 5 + 1);
355 * Unmount filesystems
357 if (panicstr == NULL)
360 tsleep(boot, 0, "shutdn", hz / 10 + 1);
366 * Dump before doing post_sync shutdown ops
369 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) {
374 * Ok, now do things that assume all filesystem activity has
375 * been completed. This will also call the device shutdown
378 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
380 /* Now that we're going to really halt the system... */
381 EVENTHANDLER_INVOKE(shutdown_final, howto);
383 for(;;) ; /* safety against shutdown_reset not working */
388 * Pass 1 - Figure out if there are any busy or dirty buffers still present.
390 * We ignore TMPFS mounts in this pass.
393 shutdown_busycount1(struct buf *bp, void *info)
397 if ((vp = bp->b_vp) != NULL && vp->v_tag == VT_TMPFS)
399 if ((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp) > 0)
401 if ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)
407 * Pass 2 - only run after pass 1 has completed or has given up
409 * We ignore TMPFS, NFS, MFS, and SMBFS mounts in this pass.
412 shutdown_busycount2(struct buf *bp, void *info)
417 * Ignore tmpfs and nfs mounts
419 if ((vp = bp->b_vp) != NULL) {
420 if (vp->v_tag == VT_TMPFS)
422 if (vp->v_tag == VT_NFS)
424 if (vp->v_tag == VT_MFS)
426 if (vp->v_tag == VT_SMBFS)
431 * Only count buffers stuck on I/O, ignore everything else
433 if (((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp)) ||
434 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
436 * Only count buffers undergoing write I/O
437 * on the related vnode.
439 if (bp->b_vp == NULL ||
440 bio_track_active(&bp->b_vp->v_track_write) == 0) {
443 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
445 "%p dev:?, flags:%08x, loffset:%jd, doffset:%jd\n",
447 bp->b_flags, (intmax_t)bp->b_loffset,
448 (intmax_t)bp->b_bio2.bio_offset);
456 * If the shutdown was a clean halt, behave accordingly.
459 shutdown_halt(void *junk, int howto)
461 if (howto & RB_HALT) {
463 kprintf("The operating system has halted.\n");
464 #ifdef _KERNEL_VIRTUAL
467 kprintf("Please press any key to reboot.\n\n");
469 case -1: /* No console, just die */
481 * Check to see if the system paniced, pause and then reboot
482 * according to the specified delay.
485 shutdown_panic(void *junk, int howto)
490 if (howto & RB_DUMP) {
491 if (PANIC_REBOOT_WAIT_TIME != 0) {
492 if (PANIC_REBOOT_WAIT_TIME != -1) {
493 kprintf("Automatic reboot in %d seconds - "
494 "press a key on the console to abort\n",
495 PANIC_REBOOT_WAIT_TIME);
496 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
498 DELAY(1000 * 100); /* 1/10th second */
499 /* Did user type a key? */
501 if (c != -1 && c != NOKEY)
507 } else { /* zero time specified - reboot NOW */
510 kprintf("--> Press a key on the console to reboot,\n");
511 kprintf("--> or switch off the system now.\n");
517 * Everything done, now reset
520 shutdown_reset(void *junk, int howto)
522 kprintf("Rebooting...\n");
523 DELAY(1000000); /* wait 1 sec for kprintf's to complete and be read */
524 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
526 /* NOTREACHED */ /* assuming reset worked */
530 * Try to remove FS references in the specified process. This function
531 * is used during shutdown
535 shutdown_cleanup_proc(struct proc *p)
537 struct filedesc *fdp;
542 if ((fdp = p->p_fd) != NULL) {
545 cache_drop(&fdp->fd_ncdir);
550 cache_drop(&fdp->fd_nrdir);
555 cache_drop(&fdp->fd_njdir);
568 pmap_remove_pages(vmspace_pmap(vm),
570 VM_MAX_USER_ADDRESS);
571 vm_map_remove(&vm->vm_map,
573 VM_MAX_USER_ADDRESS);
578 * Magic number for savecore
580 * exported (symorder) and used at least by savecore(8)
582 * Mark it as used so that gcc doesn't optimize it away.
584 __attribute__((__used__))
585 static u_long const dumpmag = 0x8fca0101UL;
587 __attribute__((__used__))
588 static int dumpsize = 0; /* also for savecore */
590 static int dodump = 1;
592 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
593 "Try to perform coredump on kernel panic");
596 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
597 uint64_t dumplen, uint32_t blksz)
599 bzero(kdh, sizeof(*kdh));
600 strncpy(kdh->magic, magic, sizeof(kdh->magic));
601 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
602 kdh->version = htod32(KERNELDUMPVERSION);
603 kdh->architectureversion = htod32(archver);
604 kdh->dumplength = htod64(dumplen);
605 kdh->dumptime = htod64(time_second);
606 kdh->blocksize = htod32(blksz);
607 strncpy(kdh->hostname, hostname, sizeof(kdh->hostname));
608 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
609 if (panicstr != NULL)
610 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
611 kdh->parity = kerneldump_parity(kdh);
615 setdumpdev(cdev_t dev)
621 disk_dumpconf(NULL, 0/*off*/);
626 * We have to open the device before we can perform ioctls on it,
627 * or the slice/label data may not be present. Device opens are
628 * usually tracked by specfs, but the dump device can be set in
629 * early boot and may not be open so this is somewhat of a hack.
631 doopen = (dev->si_sysref.refcnt == 1);
633 error = dev_dopen(dev, FREAD, S_IFCHR, proc0.p_ucred, NULL);
637 error = disk_dumpconf(dev, 1/*on*/);
643 static void dump_conf (void *dummy);
645 dump_conf(void *dummy)
651 path = kmalloc(MNAMELEN, M_TEMP, M_WAITOK);
652 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
654 * Make sure all disk devices created so far have also been
655 * probed, and also make sure that the newly created device
656 * nodes for probed disks are ready, too.
658 * XXX - Delay an additional 2 seconds to help drivers which
659 * pickup devices asynchronously and are not caught by
660 * CAM's initial probe.
663 tsleep(&_dummy, 0, "syncer", hz*2);
665 dev = kgetdiskbyname(path);
670 if (setdumpdev(dumpdev) != 0)
674 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL);
677 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
682 ndumpdev = dev2udev(dumpdev);
683 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
684 if (error == 0 && req->newptr != NULL)
685 error = setdumpdev(udev2dev(ndumpdev, 0));
689 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
690 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,udev_t", "");
693 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
694 * and then reboots. If we are called twice, then we avoid trying to sync
695 * the disks as this often leads to recursive panics.
698 panic(const char *fmt, ...)
700 int bootopt, newpanic;
701 globaldata_t gd = mycpu;
702 thread_t td = gd->gd_curthread;
704 static char buf[256];
707 * If a panic occurs on multiple cpus before the first is able to
708 * halt the other cpus, only one cpu is allowed to take the panic.
709 * Attempt to be verbose about this situation but if the kprintf()
710 * itself panics don't let us overrun the kernel stack.
712 * Be very nasty about descheduling our thread at the lowest
713 * level possible in an attempt to freeze the thread without
714 * inducing further panics.
716 * Bumping gd_trap_nesting_level will also bypass assertions in
717 * lwkt_switch() and allow us to switch away even if we are a
718 * FAST interrupt or IPI.
720 * The setting of panic_cpu_gd also determines how kprintf()
721 * spin-locks itself. DDB can set panic_cpu_gd as well.
724 globaldata_t xgd = panic_cpu_gd;
727 * Someone else got the panic cpu
729 if (xgd && xgd != gd) {
731 ++mycpu->gd_trap_nesting_level;
732 if (mycpu->gd_trap_nesting_level < 25) {
733 kprintf("SECONDARY PANIC ON CPU %d THREAD %p\n",
734 mycpu->gd_cpuid, td);
736 td->td_release = NULL; /* be a grinch */
738 lwkt_deschedule_self(td);
742 /* --mycpu->gd_trap_nesting_level */
749 if (xgd && xgd == gd)
755 if (atomic_cmpset_ptr(&panic_cpu_gd, NULL, gd))
759 * Try to get the system into a working state. Save information
760 * we are about to destroy.
763 if (panicstr == NULL) {
764 bcopy(td->td_toks_array, panic_tokens, sizeof(panic_tokens));
765 panic_tokens_count = td->td_toks_stop - &td->td_toks_base;
767 lwkt_relalltokens(td);
768 td->td_toks_stop = &td->td_toks_base;
769 if (gd->gd_spinlocks)
770 kprintf("panic with %d spinlocks held\n", gd->gd_spinlocks);
771 gd->gd_spinlocks = 0;
776 bootopt = RB_AUTOBOOT | RB_DUMP;
777 if (sync_on_panic == 0)
778 bootopt |= RB_NOSYNC;
781 bootopt |= RB_NOSYNC;
788 * Format the panic string.
791 kvsnprintf(buf, sizeof(buf), fmt, ap);
795 kprintf("panic: %s\n", buf);
796 /* two separate prints in case of an unmapped page and trap */
797 kprintf("cpuid = %d\n", mycpu->gd_cpuid);
799 #if (NGPIO > 0) && defined(ERROR_LED_ON_PANIC)
800 led_switch("error", 1);
803 #if defined(WDOG_DISABLE_ON_PANIC)
808 * Enter the debugger or fall through & dump. Entering the
809 * debugger will stop cpus. If not entering the debugger stop
812 * Limit the trace history to leave more panic data on a
813 * potentially row-limited console.
816 if (newpanic && trace_on_panic)
818 if (debugger_on_panic)
823 stop_cpus(mycpu->gd_other_cpus);
828 * Support for poweroff delay.
830 #ifndef POWEROFF_DELAY
831 # define POWEROFF_DELAY 5000
833 static int poweroff_delay = POWEROFF_DELAY;
835 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
836 &poweroff_delay, 0, "");
839 poweroff_wait(void *junk, int howto)
841 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
843 DELAY(poweroff_delay * 1000);
847 * Some system processes (e.g. syncer) need to be stopped at appropriate
848 * points in their main loops prior to a system shutdown, so that they
849 * won't interfere with the shutdown process (e.g. by holding a disk buf
850 * to cause sync to fail). For each of these system processes, register
851 * shutdown_kproc() as a handler for one of shutdown events.
853 static int kproc_shutdown_wait = 60;
854 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
855 &kproc_shutdown_wait, 0, "");
858 shutdown_kproc(void *arg, int howto)
867 td = (struct thread *)arg;
868 if ((p = td->td_proc) != NULL) {
869 kprintf("Waiting (max %d seconds) for system process `%s' to stop...",
870 kproc_shutdown_wait, p->p_comm);
872 kprintf("Waiting (max %d seconds) for system thread %s to stop...",
873 kproc_shutdown_wait, td->td_comm);
875 error = suspend_kproc(td, kproc_shutdown_wait * hz);
877 if (error == EWOULDBLOCK)
878 kprintf("timed out\n");
880 kprintf("stopped\n");
883 /* Registration of dumpers */
885 set_dumper(struct dumperinfo *di)
888 bzero(&dumper, sizeof(dumper));
892 if (dumper.dumper != NULL)
902 #if defined (_KERNEL_VIRTUAL)
903 /* vkernels don't support dumps */
904 kprintf("vkernels don't support dumps\n");
908 * If there is a dumper registered and we aren't dumping already, call
909 * the machine dependent dumpsys (md_dumpsys) to do the hard work.
911 * XXX: while right now the md_dumpsys() of x86 and x86_64 could be
912 * factored out completely into here, I rather keep them machine
913 * dependent in case we ever add a platform which does not share
914 * the same dumpsys() code, such as arm.
916 if (dumper.dumper != NULL && !dumping) {
922 int dump_stop_usertds = 0;
926 need_user_resched_remote(void *dummy)
932 dump_reactivate_cpus(void)
937 dump_stop_usertds = 1;
941 for (cpu = 0; cpu < ncpus; cpu++) {
942 gd = globaldata_find(cpu);
943 seq = lwkt_send_ipiq(gd, need_user_resched_remote, NULL);
944 lwkt_wait_ipiq(gd, seq);
947 restart_cpus(stopped_cpus);