2 * Copyright (c) 1986, 1988, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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"
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/eventhandler.h>
48 #include <sys/diskslice.h>
49 #include <sys/reboot.h>
52 #include <sys/fcntl.h> /* FREAD */
53 #include <sys/stat.h> /* S_IFCHR */
54 #include <sys/vnode.h>
55 #include <sys/kernel.h>
56 #include <sys/kerneldump.h>
57 #include <sys/kthread.h>
58 #include <sys/malloc.h>
59 #include <sys/mount.h>
60 #include <sys/queue.h>
61 #include <sys/sysctl.h>
62 #include <sys/vkernel.h>
64 #include <sys/sysproto.h>
65 #include <sys/device.h>
69 #include <sys/kern_syscall.h>
70 #include <vm/vm_map.h>
73 #include <sys/thread2.h>
75 #include <sys/mplock2.h>
77 #include <machine/cpu.h>
78 #include <machine/clock.h>
79 #include <machine/md_var.h>
80 #include <machine/smp.h> /* smp_active_mask, cpuid */
81 #include <machine/vmparam.h>
82 #include <machine/thread.h>
84 #include <sys/signalvar.h>
87 #include <dev/acpica/acpi_pvpanic/panic_notifier.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
;
309 kprintf("\nsyncing disks... ");
314 * With soft updates, some buffers that are written will be
315 * remarked as dirty until other buffers are written.
317 * sys_sync() usually runs asynchronously, to give us a
318 * better chance of syncing the rest of the filesystems when
319 * one or more of them are stuck.
321 for (iter
= pbusy
= 0; iter
< 20 + zcount
; iter
++) {
323 nbusy
= scan_all_buffers(shutdown_busycount1
,
326 nbusy
= scan_all_buffers(shutdown_busycount2
,
328 kprintf("%d ", nbusy
);
337 * There could be a lot to sync, only allow iter to
338 * proceed while there is progress.
350 * Process soft update work queue if buffers don't sync
351 * after 6 iterations by permitting the syncer to run.
357 tsleep(boot
, 0, "shutdn", hz
* iter
/ 20 + 1);
363 * Failed to sync all blocks. Indicate this and don't
364 * unmount filesystems (thus forcing an fsck on reboot).
366 kprintf("giving up on %d buffers\n", nbusy
);
368 if (debugger_on_panic
)
369 Debugger("busy buffer problem");
371 tsleep(boot
, 0, "shutdn", hz
* 5 + 1);
376 * Unmount filesystems
378 if (panicstr
== NULL
)
381 tsleep(boot
, 0, "shutdn", hz
/ 10 + 1);
387 * Dump before doing post_sync shutdown ops
390 if ((howto
& (RB_HALT
|RB_DUMP
)) == RB_DUMP
&& !cold
) {
395 * Ok, now do things that assume all filesystem activity has
396 * been completed. This will also call the device shutdown
399 EVENTHANDLER_INVOKE(shutdown_post_sync
, howto
);
401 /* Now that we're going to really halt the system... */
402 EVENTHANDLER_INVOKE(shutdown_final
, howto
);
404 for(;;) ; /* safety against shutdown_reset not working */
409 * Pass 1 - Figure out if there are any busy or dirty buffers still present.
411 * We ignore TMPFS mounts in this pass.
414 shutdown_busycount1(struct buf
*bp
, void *info __unused
)
418 if ((vp
= bp
->b_vp
) != NULL
&& vp
->v_tag
== VT_TMPFS
)
420 if ((bp
->b_flags
& B_INVAL
) == 0 && BUF_LOCKINUSE(bp
))
422 if ((bp
->b_flags
& (B_DELWRI
| B_INVAL
)) == B_DELWRI
)
428 * Pass 2 - only run after pass 1 has completed or has given up
430 * We ignore TMPFS, NFS, MFS, and SMBFS mounts in this pass.
433 shutdown_busycount2(struct buf
*bp
, void *info
)
440 * Ignore tmpfs and nfs mounts
442 if ((vp
= bp
->b_vp
) != NULL
) {
443 if (vp
->v_tag
== VT_TMPFS
)
445 if (vp
->v_tag
== VT_NFS
)
447 if (vp
->v_tag
== VT_MFS
)
449 if (vp
->v_tag
== VT_SMBFS
)
454 * Only count buffers stuck on I/O, ignore everything else
456 if (((bp
->b_flags
& B_INVAL
) == 0 && BUF_LOCKINUSE(bp
)) ||
457 ((bp
->b_flags
& (B_DELWRI
|B_INVAL
)) == B_DELWRI
)) {
459 * Only count buffers undergoing write I/O
460 * on the related vnode.
462 if (bp
->b_vp
== NULL
||
463 bio_track_active(&bp
->b_vp
->v_track_write
) == 0) {
468 if (bp
->b_vp
->v_mount
)
469 mpath
= bp
->b_vp
->v_mount
->mnt_stat
.f_mntonname
;
471 kprintf("%p on %s, flags:%08x, loffset:%jd, "
476 (intmax_t)bp
->b_loffset
,
477 (intmax_t)bp
->b_bio2
.bio_offset
);
485 * If the shutdown was a clean halt, behave accordingly.
488 shutdown_halt(void *junk
, int howto
)
490 if (howto
& RB_HALT
) {
492 kprintf("The operating system has halted.\n");
493 #ifdef _KERNEL_VIRTUAL
496 kprintf("Please press any key to reboot.\n\n");
498 case -1: /* No console, just die */
510 * Check to see if the system paniced, pause and then reboot
511 * according to the specified delay.
514 shutdown_panic(void *junk
, int howto
)
519 if (howto
& RB_DUMP
) {
520 if (PANIC_REBOOT_WAIT_TIME
!= 0) {
521 if (PANIC_REBOOT_WAIT_TIME
!= -1) {
522 kprintf("Automatic reboot in %d seconds - "
523 "press a key on the console to abort\n",
524 PANIC_REBOOT_WAIT_TIME
);
525 for (loop
= PANIC_REBOOT_WAIT_TIME
* 10;
527 DELAY(1000 * 100); /* 1/10th second */
528 /* Did user type a key? */
530 if (c
!= -1 && c
!= NOKEY
)
536 } else { /* zero time specified - reboot NOW */
539 kprintf("--> Press a key on the console to reboot,\n");
540 kprintf("--> or switch off the system now.\n");
546 * Everything done, now reset
549 shutdown_reset(void *junk
, int howto
)
551 kprintf("Rebooting...\n");
552 DELAY(1000000); /* wait 1 sec for kprintf's to complete and be read */
553 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
555 /* NOTREACHED */ /* assuming reset worked */
559 * Try to remove FS references in the specified process. This function
560 * is used during shutdown
564 shutdown_cleanup_proc(struct proc
*p
)
566 struct filedesc
*fdp
;
571 if ((fdp
= p
->p_fd
) != NULL
) {
574 cache_drop(&fdp
->fd_ncdir
);
579 cache_drop(&fdp
->fd_nrdir
);
584 cache_drop(&fdp
->fd_njdir
);
597 pmap_remove_pages(vmspace_pmap(vm
),
599 VM_MAX_USER_ADDRESS
);
600 vm_map_remove(&vm
->vm_map
,
602 VM_MAX_USER_ADDRESS
);
607 * Magic number for savecore
609 * exported (symorder) and used at least by savecore(8)
611 * Mark it as used so that gcc doesn't optimize it away.
613 __attribute__((__used__
))
614 static u_long
const dumpmag
= 0x8fca0101UL
;
616 __attribute__((__used__
))
617 static int dumpsize
= 0; /* also for savecore */
619 static int dodump
= 1;
621 SYSCTL_INT(_machdep
, OID_AUTO
, do_dump
, CTLFLAG_RW
, &dodump
, 0,
622 "Try to perform coredump on kernel panic");
625 mkdumpheader(struct kerneldumpheader
*kdh
, char *magic
, uint32_t archver
,
626 uint64_t dumplen
, uint32_t blksz
)
628 bzero(kdh
, sizeof(*kdh
));
629 strncpy(kdh
->magic
, magic
, sizeof(kdh
->magic
));
630 strncpy(kdh
->architecture
, MACHINE_ARCH
, sizeof(kdh
->architecture
));
631 kdh
->version
= htod32(KERNELDUMPVERSION
);
632 kdh
->architectureversion
= htod32(archver
);
633 kdh
->dumplength
= htod64(dumplen
);
634 kdh
->dumptime
= htod64(time_second
);
635 kdh
->blocksize
= htod32(blksz
);
636 strncpy(kdh
->hostname
, hostname
, sizeof(kdh
->hostname
));
637 strncpy(kdh
->versionstring
, version
, sizeof(kdh
->versionstring
));
638 if (panicstr
!= NULL
)
639 strncpy(kdh
->panicstring
, panicstr
, sizeof(kdh
->panicstring
));
640 kdh
->parity
= kerneldump_parity(kdh
);
644 setdumpdev(cdev_t dev
)
650 disk_dumpconf(NULL
, 0/*off*/);
656 * We have to open the device before we can perform ioctls on it,
657 * or the slice/label data may not be present. Device opens are
658 * usually tracked by specfs, but the dump device can be set in
659 * early boot and may not be open so this is somewhat of a hack.
661 doopen
= (dev
->si_sysref
.refcnt
== 1);
663 error
= dev_dopen(dev
, FREAD
, S_IFCHR
, proc0
.p_ucred
, NULL
);
667 error
= disk_dumpconf(dev
, 1/*on*/);
675 static void dump_conf (void *dummy
);
677 dump_conf(void *dummy
)
683 path
= kmalloc(MNAMELEN
, M_TEMP
, M_WAITOK
);
684 if (TUNABLE_STR_FETCH("dumpdev", path
, MNAMELEN
) != 0) {
686 * Make sure all disk devices created so far have also been
687 * probed, and also make sure that the newly created device
688 * nodes for probed disks are ready, too.
690 * XXX - Delay an additional 2 seconds to help drivers which
691 * pickup devices asynchronously and are not caught by
692 * CAM's initial probe.
695 tsleep(&_dummy
, 0, "syncer", hz
*2);
697 dev
= kgetdiskbyname(path
);
702 if (setdumpdev(dumpdev
) != 0)
706 SYSINIT(dump_conf
, SI_SUB_DUMP_CONF
, SI_ORDER_FIRST
, dump_conf
, NULL
);
709 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS
)
714 ndumpdev
= dev2udev(dumpdev
);
715 error
= sysctl_handle_opaque(oidp
, &ndumpdev
, sizeof ndumpdev
, req
);
716 if (error
== 0 && req
->newptr
!= NULL
)
717 error
= setdumpdev(udev2dev(ndumpdev
, 0));
721 SYSCTL_PROC(_kern
, KERN_DUMPDEV
, dumpdev
, CTLTYPE_OPAQUE
|CTLFLAG_RW
,
722 0, sizeof dumpdev
, sysctl_kern_dumpdev
, "T,udev_t", "");
724 static struct panicerinfo
*panic_notifier
;
727 set_panic_notifier(struct panicerinfo
*info
)
730 panic_notifier
= NULL
;
731 else if (panic_notifier
!= NULL
)
734 panic_notifier
= info
;
740 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
741 * and then reboots. If we are called twice, then we avoid trying to sync
742 * the disks as this often leads to recursive panics.
745 panic(const char *fmt
, ...)
747 int bootopt
, newpanic
;
748 globaldata_t gd
= mycpu
;
749 thread_t td
= gd
->gd_curthread
;
751 static char buf
[256];
754 * If a panic occurs on multiple cpus before the first is able to
755 * halt the other cpus, only one cpu is allowed to take the panic.
756 * Attempt to be verbose about this situation but if the kprintf()
757 * itself panics don't let us overrun the kernel stack.
759 * Be very nasty about descheduling our thread at the lowest
760 * level possible in an attempt to freeze the thread without
761 * inducing further panics.
763 * Bumping gd_trap_nesting_level will also bypass assertions in
764 * lwkt_switch() and allow us to switch away even if we are a
765 * FAST interrupt or IPI.
767 * The setting of panic_cpu_gd also determines how kprintf()
768 * spin-locks itself. DDB can set panic_cpu_gd as well.
771 globaldata_t xgd
= panic_cpu_gd
;
774 * Someone else got the panic cpu
776 if (xgd
&& xgd
!= gd
) {
778 ++mycpu
->gd_trap_nesting_level
;
779 if (mycpu
->gd_trap_nesting_level
< 25) {
780 kprintf("SECONDARY PANIC ON CPU %d THREAD %p\n",
781 mycpu
->gd_cpuid
, td
);
783 td
->td_release
= NULL
; /* be a grinch */
785 lwkt_deschedule_self(td
);
789 /* --mycpu->gd_trap_nesting_level */
796 if (xgd
&& xgd
== gd
)
802 if (atomic_cmpset_ptr(&panic_cpu_gd
, NULL
, gd
))
806 * Try to get the system into a working state. Save information
807 * we are about to destroy.
810 if (panicstr
== NULL
) {
811 bcopy(td
->td_toks_array
, panic_tokens
, sizeof(panic_tokens
));
812 panic_tokens_count
= td
->td_toks_stop
- &td
->td_toks_base
;
814 lwkt_relalltokens(td
);
815 td
->td_toks_stop
= &td
->td_toks_base
;
816 if (gd
->gd_spinlocks
)
817 kprintf("panic with %d spinlocks held\n", gd
->gd_spinlocks
);
818 gd
->gd_spinlocks
= 0;
823 bootopt
= RB_AUTOBOOT
| RB_DUMP
;
824 if (sync_on_panic
== 0)
825 bootopt
|= RB_NOSYNC
;
828 bootopt
|= RB_NOSYNC
;
835 * Format the panic string.
838 kvsnprintf(buf
, sizeof(buf
), fmt
, ap
);
842 if (panic_notifier
!= NULL
)
843 panic_notifier
->notifier(panic_notifier
->arg
);
844 kprintf("panic: %s\n", buf
);
845 /* two separate prints in case of an unmapped page and trap */
846 kprintf("cpuid = %d\n", mycpu
->gd_cpuid
);
848 #if (NGPIO > 0) && defined(ERROR_LED_ON_PANIC)
849 led_switch("error", 1);
852 #if defined(WDOG_DISABLE_ON_PANIC)
857 * Make sure kgdb knows who we are, there won't be a stoppcbs[]
858 * entry since our cpu wasn't stopped.
861 dumpthread
= curthread
;
864 * Enter the debugger or fall through & dump. Entering the
865 * debugger will stop cpus. If not entering the debugger stop
868 * Limit the trace history to leave more panic data on a
869 * potentially row-limited console.
873 if (newpanic
&& trace_on_panic
)
875 if (debugger_on_panic
)
880 stop_cpus(mycpu
->gd_other_cpus
);
885 * Support for poweroff delay.
887 #ifndef POWEROFF_DELAY
888 # define POWEROFF_DELAY 5000
890 static int poweroff_delay
= POWEROFF_DELAY
;
892 SYSCTL_INT(_kern_shutdown
, OID_AUTO
, poweroff_delay
, CTLFLAG_RW
,
893 &poweroff_delay
, 0, "");
896 poweroff_wait(void *junk
, int howto
)
898 if(!(howto
& RB_POWEROFF
) || poweroff_delay
<= 0)
900 DELAY(poweroff_delay
* 1000);
904 * Some system processes (e.g. syncer) need to be stopped at appropriate
905 * points in their main loops prior to a system shutdown, so that they
906 * won't interfere with the shutdown process (e.g. by holding a disk buf
907 * to cause sync to fail). For each of these system processes, register
908 * shutdown_kproc() as a handler for one of shutdown events.
910 static int kproc_shutdown_wait
= 60;
911 SYSCTL_INT(_kern_shutdown
, OID_AUTO
, kproc_shutdown_wait
, CTLFLAG_RW
,
912 &kproc_shutdown_wait
, 0, "");
915 shutdown_kproc(void *arg
, int howto
)
924 td
= (struct thread
*)arg
;
925 if ((p
= td
->td_proc
) != NULL
) {
926 kprintf("Waiting (max %d seconds) for system process `%s' to stop...",
927 kproc_shutdown_wait
, p
->p_comm
);
929 kprintf("Waiting (max %d seconds) for system thread %s to stop...",
930 kproc_shutdown_wait
, td
->td_comm
);
932 error
= suspend_kproc(td
, kproc_shutdown_wait
* hz
);
934 if (error
== EWOULDBLOCK
)
935 kprintf("timed out\n");
937 kprintf("stopped\n");
940 /* Registration of dumpers */
942 set_dumper(struct dumperinfo
*di
)
945 bzero(&dumper
, sizeof(dumper
));
949 if (dumper
.dumper
!= NULL
)
959 #if defined (_KERNEL_VIRTUAL)
960 /* vkernels don't support dumps */
961 kprintf("vkernels don't support dumps\n");
965 * If there is a dumper registered and we aren't dumping already, call
966 * the machine dependent dumpsys (md_dumpsys) to do the hard work.
968 * XXX: while right now the md_dumpsys() of x86 and x86_64 could be
969 * factored out completely into here, I rather keep them machine
970 * dependent in case we ever add a platform which does not share
971 * the same dumpsys() code, such as arm.
973 if (dumper
.dumper
!= NULL
&& !dumping
) {
979 int dump_stop_usertds
= 0;
983 need_user_resched_remote(void *dummy
)
989 dump_reactivate_cpus(void)
994 dump_stop_usertds
= 1;
998 for (cpu
= 0; cpu
< ncpus
; cpu
++) {
999 gd
= globaldata_find(cpu
);
1000 seq
= lwkt_send_ipiq(gd
, need_user_resched_remote
, NULL
);
1001 lwkt_wait_ipiq(gd
, seq
);
1004 restart_cpus(stopped_cpus
);