39
40#include "opt_ddb.h"
41#include "opt_kdb.h"
42#include "opt_panic.h"
43#include "opt_show_busybufs.h"
44#include "opt_sched.h"
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/bio.h>
49#include <sys/buf.h>
50#include <sys/conf.h>
51#include <sys/cons.h>
52#include <sys/eventhandler.h>
53#include <sys/jail.h>
54#include <sys/kdb.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/priv.h>
61#include <sys/proc.h>
62#include <sys/reboot.h>
63#include <sys/resourcevar.h>
64#include <sys/sched.h>
65#include <sys/smp.h> /* smp_active */
66#include <sys/sysctl.h>
67#include <sys/sysproto.h>
68
69#include <ddb/ddb.h>
70
71#include <machine/cpu.h>
72#include <machine/pcb.h>
73#include <machine/smp.h>
74
75#include <security/mac/mac_framework.h>
76
77#include <vm/vm.h>
78#include <vm/vm_object.h>
79#include <vm/vm_page.h>
80#include <vm/vm_pager.h>
81#include <vm/swap_pager.h>
82
83#include <sys/signalvar.h>
84
85#ifndef PANIC_REBOOT_WAIT_TIME
86#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
87#endif
88
89/*
90 * Note that stdarg.h and the ANSI style va_start macro is used for both
91 * ANSI and traditional C compilers.
92 */
93#include <machine/stdarg.h>
94
95#ifdef KDB
96#ifdef KDB_UNATTENDED
97int debugger_on_panic = 0;
98#else
99int debugger_on_panic = 1;
100#endif
101SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
102 &debugger_on_panic, 0, "Run debugger on kernel panic");
103
104#ifdef KDB_TRACE
105int trace_on_panic = 1;
106#else
107int trace_on_panic = 0;
108#endif
109SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
110 &trace_on_panic, 0, "Print stack trace on kernel panic");
111#endif /* KDB */
112
113int sync_on_panic = 0;
114SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
115 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
116
117SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
118
119/*
120 * Variable panicstr contains argument to first call to panic; used as flag
121 * to indicate that the kernel has already called panic.
122 */
123const char *panicstr;
124
125int dumping; /* system is dumping */
126int rebooting; /* system is rebooting */
127static struct dumperinfo dumper; /* our selected dumper */
128
129/* Context information for dump-debuggers. */
130static struct pcb dumppcb; /* Registers. */
131static lwpid_t dumptid; /* Thread ID. */
132
133static void boot(int) __dead2;
134static void poweroff_wait(void *, int);
135static void shutdown_halt(void *junk, int howto);
136static void shutdown_panic(void *junk, int howto);
137static void shutdown_reset(void *junk, int howto);
138
139/* register various local shutdown events */
140static void
141shutdown_conf(void *unused)
142{
143
144 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
145 SHUTDOWN_PRI_FIRST);
146 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
147 SHUTDOWN_PRI_LAST + 100);
148 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
149 SHUTDOWN_PRI_LAST + 100);
150 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
151 SHUTDOWN_PRI_LAST + 200);
152}
153
154SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
155
156/*
157 * The system call that results in a reboot.
158 */
159/* ARGSUSED */
160int
161reboot(struct thread *td, struct reboot_args *uap)
162{
163 int error;
164
165 error = 0;
166#ifdef MAC
167 error = mac_system_check_reboot(td->td_ucred, uap->opt);
168#endif
169 if (error == 0)
170 error = priv_check(td, PRIV_REBOOT);
171 if (error == 0) {
172 mtx_lock(&Giant);
173 boot(uap->opt);
174 mtx_unlock(&Giant);
175 }
176 return (error);
177}
178
179/*
180 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
181 */
182static int shutdown_howto = 0;
183
184void
185shutdown_nice(int howto)
186{
187
188 shutdown_howto = howto;
189
190 /* Send a signal to init(8) and have it shutdown the world */
191 if (initproc != NULL) {
192 PROC_LOCK(initproc);
193 psignal(initproc, SIGINT);
194 PROC_UNLOCK(initproc);
195 } else {
196 /* No init(8) running, so simply reboot */
197 boot(RB_NOSYNC);
198 }
199 return;
200}
201static int waittime = -1;
202
203static void
204print_uptime(void)
205{
206 int f;
207 struct timespec ts;
208
209 getnanouptime(&ts);
210 printf("Uptime: ");
211 f = 0;
212 if (ts.tv_sec >= 86400) {
213 printf("%ldd", (long)ts.tv_sec / 86400);
214 ts.tv_sec %= 86400;
215 f = 1;
216 }
217 if (f || ts.tv_sec >= 3600) {
218 printf("%ldh", (long)ts.tv_sec / 3600);
219 ts.tv_sec %= 3600;
220 f = 1;
221 }
222 if (f || ts.tv_sec >= 60) {
223 printf("%ldm", (long)ts.tv_sec / 60);
224 ts.tv_sec %= 60;
225 f = 1;
226 }
227 printf("%lds\n", (long)ts.tv_sec);
228}
229
230static void
231doadump(void)
232{
233
234 /*
235 * Sometimes people have to call this from the kernel debugger.
236 * (if 'panic' can not dump)
237 * Give them a clue as to why they can't dump.
238 */
239 if (dumper.dumper == NULL) {
240 printf("Cannot dump. Device not defined or unavailable.\n");
241 return;
242 }
243
244 savectx(&dumppcb);
245 dumptid = curthread->td_tid;
246 dumping++;
247#ifdef DDB
248 if (textdump_pending)
249 textdump_dumpsys(&dumper);
250 else
251#endif
252 dumpsys(&dumper);
253 dumping--;
254}
255
256static int
257isbufbusy(struct buf *bp)
258{
259 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
260 BUF_ISLOCKED(bp)) ||
261 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
262 return (1);
263 return (0);
264}
265
266/*
267 * Shutdown the system cleanly to prepare for reboot, halt, or power off.
268 */
269static void
270boot(int howto)
271{
272 static int first_buf_printf = 1;
273
274#if defined(SMP)
275 /*
276 * Bind us to CPU 0 so that all shutdown code runs there. Some
277 * systems don't shutdown properly (i.e., ACPI power off) if we
278 * run on another processor.
279 */
280 thread_lock(curthread);
281 sched_bind(curthread, 0);
282 thread_unlock(curthread);
283 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
284#endif
285 /* We're in the process of rebooting. */
286 rebooting = 1;
287
288 /* collect extra flags that shutdown_nice might have set */
289 howto |= shutdown_howto;
290
291 /* We are out of the debugger now. */
292 kdb_active = 0;
293
294 /*
295 * Do any callouts that should be done BEFORE syncing the filesystems.
296 */
297 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
298
299 /*
300 * Now sync filesystems
301 */
302 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
303 register struct buf *bp;
304 int iter, nbusy, pbusy;
305#ifndef PREEMPTION
306 int subiter;
307#endif
308
309 waittime = 0;
310
311 sync(curthread, NULL);
312
313 /*
314 * With soft updates, some buffers that are
315 * written will be remarked as dirty until other
316 * buffers are written.
317 */
318 for (iter = pbusy = 0; iter < 20; iter++) {
319 nbusy = 0;
320 for (bp = &buf[nbuf]; --bp >= buf; )
321 if (isbufbusy(bp))
322 nbusy++;
323 if (nbusy == 0) {
324 if (first_buf_printf)
325 printf("All buffers synced.");
326 break;
327 }
328 if (first_buf_printf) {
329 printf("Syncing disks, buffers remaining... ");
330 first_buf_printf = 0;
331 }
332 printf("%d ", nbusy);
333 if (nbusy < pbusy)
334 iter = 0;
335 pbusy = nbusy;
336 sync(curthread, NULL);
337
338#ifdef PREEMPTION
339 /*
340 * Drop Giant and spin for a while to allow
341 * interrupt threads to run.
342 */
343 DROP_GIANT();
344 DELAY(50000 * iter);
345 PICKUP_GIANT();
346#else
347 /*
348 * Drop Giant and context switch several times to
349 * allow interrupt threads to run.
350 */
351 DROP_GIANT();
352 for (subiter = 0; subiter < 50 * iter; subiter++) {
353 thread_lock(curthread);
354 mi_switch(SW_VOL, NULL);
355 thread_unlock(curthread);
356 DELAY(1000);
357 }
358 PICKUP_GIANT();
359#endif
360 }
361 printf("\n");
362 /*
363 * Count only busy local buffers to prevent forcing
364 * a fsck if we're just a client of a wedged NFS server
365 */
366 nbusy = 0;
367 for (bp = &buf[nbuf]; --bp >= buf; ) {
368 if (isbufbusy(bp)) {
369#if 0
370/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */
371 if (bp->b_dev == NULL) {
372 TAILQ_REMOVE(&mountlist,
373 bp->b_vp->v_mount, mnt_list);
374 continue;
375 }
376#endif
377 nbusy++;
378#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
379 printf(
380 "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
381 nbusy, bp->b_bufobj,
382 bp->b_flags, (long)bp->b_blkno,
383 (long)bp->b_lblkno);
384#endif
385 }
386 }
387 if (nbusy) {
388 /*
389 * Failed to sync all blocks. Indicate this and don't
390 * unmount filesystems (thus forcing an fsck on reboot).
391 */
392 printf("Giving up on %d buffers\n", nbusy);
393 DELAY(5000000); /* 5 seconds */
394 } else {
395 if (!first_buf_printf)
396 printf("Final sync complete\n");
397 /*
398 * Unmount filesystems
399 */
400 if (panicstr == 0)
401 vfs_unmountall();
402 }
403 swapoff_all();
404 DELAY(100000); /* wait for console output to finish */
405 }
406
407 print_uptime();
408
409 /*
410 * Ok, now do things that assume all filesystem activity has
411 * been completed.
412 */
413 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
414
415 /* XXX This doesn't disable interrupts any more. Reconsider? */
416 splhigh();
417
418 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
419 doadump();
420
421 /* Now that we're going to really halt the system... */
422 EVENTHANDLER_INVOKE(shutdown_final, howto);
423
424 for(;;) ; /* safety against shutdown_reset not working */
425 /* NOTREACHED */
426}
427
428/*
429 * If the shutdown was a clean halt, behave accordingly.
430 */
431static void
432shutdown_halt(void *junk, int howto)
433{
434
435 if (howto & RB_HALT) {
436 printf("\n");
437 printf("The operating system has halted.\n");
438 printf("Please press any key to reboot.\n\n");
439 switch (cngetc()) {
440 case -1: /* No console, just die */
441 cpu_halt();
442 /* NOTREACHED */
443 default:
444 howto &= ~RB_HALT;
445 break;
446 }
447 }
448}
449
450/*
451 * Check to see if the system paniced, pause and then reboot
452 * according to the specified delay.
453 */
454static void
455shutdown_panic(void *junk, int howto)
456{
457 int loop;
458
459 if (howto & RB_DUMP) {
460 if (PANIC_REBOOT_WAIT_TIME != 0) {
461 if (PANIC_REBOOT_WAIT_TIME != -1) {
462 printf("Automatic reboot in %d seconds - "
463 "press a key on the console to abort\n",
464 PANIC_REBOOT_WAIT_TIME);
465 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
466 loop > 0; --loop) {
467 DELAY(1000 * 100); /* 1/10th second */
468 /* Did user type a key? */
469 if (cncheckc() != -1)
470 break;
471 }
472 if (!loop)
473 return;
474 }
475 } else { /* zero time specified - reboot NOW */
476 return;
477 }
478 printf("--> Press a key on the console to reboot,\n");
479 printf("--> or switch off the system now.\n");
480 cngetc();
481 }
482}
483
484/*
485 * Everything done, now reset
486 */
487static void
488shutdown_reset(void *junk, int howto)
489{
490
491 printf("Rebooting...\n");
492 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
493 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
494 cpu_reset();
495 /* NOTREACHED */ /* assuming reset worked */
496}
497
498#ifdef SMP
499static u_int panic_cpu = NOCPU;
500#endif
501
502/*
503 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
504 * and then reboots. If we are called twice, then we avoid trying to sync
505 * the disks as this often leads to recursive panics.
506 */
507void
508panic(const char *fmt, ...)
509{
510 struct thread *td = curthread;
511 int bootopt, newpanic;
512 va_list ap;
513 static char buf[256];
514
515 critical_enter();
516#ifdef SMP
517 /*
518 * We don't want multiple CPU's to panic at the same time, so we
519 * use panic_cpu as a simple spinlock. We have to keep checking
520 * panic_cpu if we are spinning in case the panic on the first
521 * CPU is canceled.
522 */
523 if (panic_cpu != PCPU_GET(cpuid))
524 while (atomic_cmpset_int(&panic_cpu, NOCPU,
525 PCPU_GET(cpuid)) == 0)
526 while (panic_cpu != NOCPU)
527 ; /* nothing */
528#endif
529
530 bootopt = RB_AUTOBOOT | RB_DUMP;
531 newpanic = 0;
532 if (panicstr)
533 bootopt |= RB_NOSYNC;
534 else {
535 panicstr = fmt;
536 newpanic = 1;
537 }
538
539 va_start(ap, fmt);
540 if (newpanic) {
541 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
542 panicstr = buf;
543 printf("panic: %s\n", buf);
544 } else {
545 printf("panic: ");
546 vprintf(fmt, ap);
547 printf("\n");
548 }
549 va_end(ap);
550#ifdef SMP
551 printf("cpuid = %d\n", PCPU_GET(cpuid));
552#endif
553
554#ifdef KDB
555 if (newpanic && trace_on_panic)
556 kdb_backtrace();
557 if (debugger_on_panic)
558 kdb_enter(KDB_WHY_PANIC, "panic");
559#ifdef RESTARTABLE_PANICS
560 /* See if the user aborted the panic, in which case we continue. */
561 if (panicstr == NULL) {
562#ifdef SMP
563 atomic_store_rel_int(&panic_cpu, NOCPU);
564#endif
565 return;
566 }
567#endif
568#endif
569 /*thread_lock(td); */
570 td->td_flags |= TDF_INPANIC;
571 /* thread_unlock(td); */
572 if (!sync_on_panic)
573 bootopt |= RB_NOSYNC;
574 critical_exit();
575 boot(bootopt);
576}
577
578/*
579 * Support for poweroff delay.
580 */
581#ifndef POWEROFF_DELAY
582# define POWEROFF_DELAY 5000
583#endif
584static int poweroff_delay = POWEROFF_DELAY;
585
586SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
587 &poweroff_delay, 0, "");
588
589static void
590poweroff_wait(void *junk, int howto)
591{
592
593 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
594 return;
595 DELAY(poweroff_delay * 1000);
596}
597
598/*
599 * Some system processes (e.g. syncer) need to be stopped at appropriate
600 * points in their main loops prior to a system shutdown, so that they
601 * won't interfere with the shutdown process (e.g. by holding a disk buf
602 * to cause sync to fail). For each of these system processes, register
603 * shutdown_kproc() as a handler for one of shutdown events.
604 */
605static int kproc_shutdown_wait = 60;
606SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
607 &kproc_shutdown_wait, 0, "");
608
609void
610kproc_shutdown(void *arg, int howto)
611{
612 struct proc *p;
613 char procname[MAXCOMLEN + 1];
614 int error;
615
616 if (panicstr)
617 return;
618
619 p = (struct proc *)arg;
620 strlcpy(procname, p->p_comm, sizeof(procname));
621 printf("Waiting (max %d seconds) for system process `%s' to stop...",
622 kproc_shutdown_wait, procname);
623 error = kproc_suspend(p, kproc_shutdown_wait * hz);
624
625 if (error == EWOULDBLOCK)
626 printf("timed out\n");
627 else
628 printf("done\n");
629}
630
631void
632kthread_shutdown(void *arg, int howto)
633{
634 struct thread *td;
635 char procname[MAXCOMLEN + 1];
636 int error;
637
638 if (panicstr)
639 return;
640
641 td = (struct thread *)arg;
642 strlcpy(procname, td->td_name, sizeof(procname));
643 printf("Waiting (max %d seconds) for system thread `%s' to stop...",
644 kproc_shutdown_wait, procname);
645 error = kthread_suspend(td, kproc_shutdown_wait * hz);
646
647 if (error == EWOULDBLOCK)
648 printf("timed out\n");
649 else
650 printf("done\n");
651}
652
653/* Registration of dumpers */
654int
655set_dumper(struct dumperinfo *di)
656{
657
658 if (di == NULL) {
659 bzero(&dumper, sizeof dumper);
660 return (0);
661 }
662 if (dumper.dumper != NULL)
663 return (EBUSY);
664 dumper = *di;
665 return (0);
666}
667
668/* Call dumper with bounds checking. */
669int
670dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
671 off_t offset, size_t length)
672{
673
674 if (length != 0 && (offset < di->mediaoffset ||
675 offset - di->mediaoffset + length > di->mediasize)) {
676 printf("Attempt to write outside dump device boundaries.\n");
677 return (ENXIO);
678 }
679 return (di->dumper(di->priv, virtual, physical, offset, length));
680}
681
682void
683mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
684 uint64_t dumplen, uint32_t blksz)
685{
686
687 bzero(kdh, sizeof(*kdh));
688 strncpy(kdh->magic, magic, sizeof(kdh->magic));
689 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
690 kdh->version = htod32(KERNELDUMPVERSION);
691 kdh->architectureversion = htod32(archver);
692 kdh->dumplength = htod64(dumplen);
693 kdh->dumptime = htod64(time_second);
694 kdh->blocksize = htod32(blksz);
| 39
40#include "opt_ddb.h"
41#include "opt_kdb.h"
42#include "opt_panic.h"
43#include "opt_show_busybufs.h"
44#include "opt_sched.h"
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/bio.h>
49#include <sys/buf.h>
50#include <sys/conf.h>
51#include <sys/cons.h>
52#include <sys/eventhandler.h>
53#include <sys/jail.h>
54#include <sys/kdb.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/priv.h>
61#include <sys/proc.h>
62#include <sys/reboot.h>
63#include <sys/resourcevar.h>
64#include <sys/sched.h>
65#include <sys/smp.h> /* smp_active */
66#include <sys/sysctl.h>
67#include <sys/sysproto.h>
68
69#include <ddb/ddb.h>
70
71#include <machine/cpu.h>
72#include <machine/pcb.h>
73#include <machine/smp.h>
74
75#include <security/mac/mac_framework.h>
76
77#include <vm/vm.h>
78#include <vm/vm_object.h>
79#include <vm/vm_page.h>
80#include <vm/vm_pager.h>
81#include <vm/swap_pager.h>
82
83#include <sys/signalvar.h>
84
85#ifndef PANIC_REBOOT_WAIT_TIME
86#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
87#endif
88
89/*
90 * Note that stdarg.h and the ANSI style va_start macro is used for both
91 * ANSI and traditional C compilers.
92 */
93#include <machine/stdarg.h>
94
95#ifdef KDB
96#ifdef KDB_UNATTENDED
97int debugger_on_panic = 0;
98#else
99int debugger_on_panic = 1;
100#endif
101SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
102 &debugger_on_panic, 0, "Run debugger on kernel panic");
103
104#ifdef KDB_TRACE
105int trace_on_panic = 1;
106#else
107int trace_on_panic = 0;
108#endif
109SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
110 &trace_on_panic, 0, "Print stack trace on kernel panic");
111#endif /* KDB */
112
113int sync_on_panic = 0;
114SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
115 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
116
117SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
118
119/*
120 * Variable panicstr contains argument to first call to panic; used as flag
121 * to indicate that the kernel has already called panic.
122 */
123const char *panicstr;
124
125int dumping; /* system is dumping */
126int rebooting; /* system is rebooting */
127static struct dumperinfo dumper; /* our selected dumper */
128
129/* Context information for dump-debuggers. */
130static struct pcb dumppcb; /* Registers. */
131static lwpid_t dumptid; /* Thread ID. */
132
133static void boot(int) __dead2;
134static void poweroff_wait(void *, int);
135static void shutdown_halt(void *junk, int howto);
136static void shutdown_panic(void *junk, int howto);
137static void shutdown_reset(void *junk, int howto);
138
139/* register various local shutdown events */
140static void
141shutdown_conf(void *unused)
142{
143
144 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
145 SHUTDOWN_PRI_FIRST);
146 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
147 SHUTDOWN_PRI_LAST + 100);
148 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
149 SHUTDOWN_PRI_LAST + 100);
150 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
151 SHUTDOWN_PRI_LAST + 200);
152}
153
154SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
155
156/*
157 * The system call that results in a reboot.
158 */
159/* ARGSUSED */
160int
161reboot(struct thread *td, struct reboot_args *uap)
162{
163 int error;
164
165 error = 0;
166#ifdef MAC
167 error = mac_system_check_reboot(td->td_ucred, uap->opt);
168#endif
169 if (error == 0)
170 error = priv_check(td, PRIV_REBOOT);
171 if (error == 0) {
172 mtx_lock(&Giant);
173 boot(uap->opt);
174 mtx_unlock(&Giant);
175 }
176 return (error);
177}
178
179/*
180 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
181 */
182static int shutdown_howto = 0;
183
184void
185shutdown_nice(int howto)
186{
187
188 shutdown_howto = howto;
189
190 /* Send a signal to init(8) and have it shutdown the world */
191 if (initproc != NULL) {
192 PROC_LOCK(initproc);
193 psignal(initproc, SIGINT);
194 PROC_UNLOCK(initproc);
195 } else {
196 /* No init(8) running, so simply reboot */
197 boot(RB_NOSYNC);
198 }
199 return;
200}
201static int waittime = -1;
202
203static void
204print_uptime(void)
205{
206 int f;
207 struct timespec ts;
208
209 getnanouptime(&ts);
210 printf("Uptime: ");
211 f = 0;
212 if (ts.tv_sec >= 86400) {
213 printf("%ldd", (long)ts.tv_sec / 86400);
214 ts.tv_sec %= 86400;
215 f = 1;
216 }
217 if (f || ts.tv_sec >= 3600) {
218 printf("%ldh", (long)ts.tv_sec / 3600);
219 ts.tv_sec %= 3600;
220 f = 1;
221 }
222 if (f || ts.tv_sec >= 60) {
223 printf("%ldm", (long)ts.tv_sec / 60);
224 ts.tv_sec %= 60;
225 f = 1;
226 }
227 printf("%lds\n", (long)ts.tv_sec);
228}
229
230static void
231doadump(void)
232{
233
234 /*
235 * Sometimes people have to call this from the kernel debugger.
236 * (if 'panic' can not dump)
237 * Give them a clue as to why they can't dump.
238 */
239 if (dumper.dumper == NULL) {
240 printf("Cannot dump. Device not defined or unavailable.\n");
241 return;
242 }
243
244 savectx(&dumppcb);
245 dumptid = curthread->td_tid;
246 dumping++;
247#ifdef DDB
248 if (textdump_pending)
249 textdump_dumpsys(&dumper);
250 else
251#endif
252 dumpsys(&dumper);
253 dumping--;
254}
255
256static int
257isbufbusy(struct buf *bp)
258{
259 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
260 BUF_ISLOCKED(bp)) ||
261 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
262 return (1);
263 return (0);
264}
265
266/*
267 * Shutdown the system cleanly to prepare for reboot, halt, or power off.
268 */
269static void
270boot(int howto)
271{
272 static int first_buf_printf = 1;
273
274#if defined(SMP)
275 /*
276 * Bind us to CPU 0 so that all shutdown code runs there. Some
277 * systems don't shutdown properly (i.e., ACPI power off) if we
278 * run on another processor.
279 */
280 thread_lock(curthread);
281 sched_bind(curthread, 0);
282 thread_unlock(curthread);
283 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
284#endif
285 /* We're in the process of rebooting. */
286 rebooting = 1;
287
288 /* collect extra flags that shutdown_nice might have set */
289 howto |= shutdown_howto;
290
291 /* We are out of the debugger now. */
292 kdb_active = 0;
293
294 /*
295 * Do any callouts that should be done BEFORE syncing the filesystems.
296 */
297 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
298
299 /*
300 * Now sync filesystems
301 */
302 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
303 register struct buf *bp;
304 int iter, nbusy, pbusy;
305#ifndef PREEMPTION
306 int subiter;
307#endif
308
309 waittime = 0;
310
311 sync(curthread, NULL);
312
313 /*
314 * With soft updates, some buffers that are
315 * written will be remarked as dirty until other
316 * buffers are written.
317 */
318 for (iter = pbusy = 0; iter < 20; iter++) {
319 nbusy = 0;
320 for (bp = &buf[nbuf]; --bp >= buf; )
321 if (isbufbusy(bp))
322 nbusy++;
323 if (nbusy == 0) {
324 if (first_buf_printf)
325 printf("All buffers synced.");
326 break;
327 }
328 if (first_buf_printf) {
329 printf("Syncing disks, buffers remaining... ");
330 first_buf_printf = 0;
331 }
332 printf("%d ", nbusy);
333 if (nbusy < pbusy)
334 iter = 0;
335 pbusy = nbusy;
336 sync(curthread, NULL);
337
338#ifdef PREEMPTION
339 /*
340 * Drop Giant and spin for a while to allow
341 * interrupt threads to run.
342 */
343 DROP_GIANT();
344 DELAY(50000 * iter);
345 PICKUP_GIANT();
346#else
347 /*
348 * Drop Giant and context switch several times to
349 * allow interrupt threads to run.
350 */
351 DROP_GIANT();
352 for (subiter = 0; subiter < 50 * iter; subiter++) {
353 thread_lock(curthread);
354 mi_switch(SW_VOL, NULL);
355 thread_unlock(curthread);
356 DELAY(1000);
357 }
358 PICKUP_GIANT();
359#endif
360 }
361 printf("\n");
362 /*
363 * Count only busy local buffers to prevent forcing
364 * a fsck if we're just a client of a wedged NFS server
365 */
366 nbusy = 0;
367 for (bp = &buf[nbuf]; --bp >= buf; ) {
368 if (isbufbusy(bp)) {
369#if 0
370/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */
371 if (bp->b_dev == NULL) {
372 TAILQ_REMOVE(&mountlist,
373 bp->b_vp->v_mount, mnt_list);
374 continue;
375 }
376#endif
377 nbusy++;
378#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
379 printf(
380 "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
381 nbusy, bp->b_bufobj,
382 bp->b_flags, (long)bp->b_blkno,
383 (long)bp->b_lblkno);
384#endif
385 }
386 }
387 if (nbusy) {
388 /*
389 * Failed to sync all blocks. Indicate this and don't
390 * unmount filesystems (thus forcing an fsck on reboot).
391 */
392 printf("Giving up on %d buffers\n", nbusy);
393 DELAY(5000000); /* 5 seconds */
394 } else {
395 if (!first_buf_printf)
396 printf("Final sync complete\n");
397 /*
398 * Unmount filesystems
399 */
400 if (panicstr == 0)
401 vfs_unmountall();
402 }
403 swapoff_all();
404 DELAY(100000); /* wait for console output to finish */
405 }
406
407 print_uptime();
408
409 /*
410 * Ok, now do things that assume all filesystem activity has
411 * been completed.
412 */
413 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
414
415 /* XXX This doesn't disable interrupts any more. Reconsider? */
416 splhigh();
417
418 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
419 doadump();
420
421 /* Now that we're going to really halt the system... */
422 EVENTHANDLER_INVOKE(shutdown_final, howto);
423
424 for(;;) ; /* safety against shutdown_reset not working */
425 /* NOTREACHED */
426}
427
428/*
429 * If the shutdown was a clean halt, behave accordingly.
430 */
431static void
432shutdown_halt(void *junk, int howto)
433{
434
435 if (howto & RB_HALT) {
436 printf("\n");
437 printf("The operating system has halted.\n");
438 printf("Please press any key to reboot.\n\n");
439 switch (cngetc()) {
440 case -1: /* No console, just die */
441 cpu_halt();
442 /* NOTREACHED */
443 default:
444 howto &= ~RB_HALT;
445 break;
446 }
447 }
448}
449
450/*
451 * Check to see if the system paniced, pause and then reboot
452 * according to the specified delay.
453 */
454static void
455shutdown_panic(void *junk, int howto)
456{
457 int loop;
458
459 if (howto & RB_DUMP) {
460 if (PANIC_REBOOT_WAIT_TIME != 0) {
461 if (PANIC_REBOOT_WAIT_TIME != -1) {
462 printf("Automatic reboot in %d seconds - "
463 "press a key on the console to abort\n",
464 PANIC_REBOOT_WAIT_TIME);
465 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
466 loop > 0; --loop) {
467 DELAY(1000 * 100); /* 1/10th second */
468 /* Did user type a key? */
469 if (cncheckc() != -1)
470 break;
471 }
472 if (!loop)
473 return;
474 }
475 } else { /* zero time specified - reboot NOW */
476 return;
477 }
478 printf("--> Press a key on the console to reboot,\n");
479 printf("--> or switch off the system now.\n");
480 cngetc();
481 }
482}
483
484/*
485 * Everything done, now reset
486 */
487static void
488shutdown_reset(void *junk, int howto)
489{
490
491 printf("Rebooting...\n");
492 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
493 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
494 cpu_reset();
495 /* NOTREACHED */ /* assuming reset worked */
496}
497
498#ifdef SMP
499static u_int panic_cpu = NOCPU;
500#endif
501
502/*
503 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
504 * and then reboots. If we are called twice, then we avoid trying to sync
505 * the disks as this often leads to recursive panics.
506 */
507void
508panic(const char *fmt, ...)
509{
510 struct thread *td = curthread;
511 int bootopt, newpanic;
512 va_list ap;
513 static char buf[256];
514
515 critical_enter();
516#ifdef SMP
517 /*
518 * We don't want multiple CPU's to panic at the same time, so we
519 * use panic_cpu as a simple spinlock. We have to keep checking
520 * panic_cpu if we are spinning in case the panic on the first
521 * CPU is canceled.
522 */
523 if (panic_cpu != PCPU_GET(cpuid))
524 while (atomic_cmpset_int(&panic_cpu, NOCPU,
525 PCPU_GET(cpuid)) == 0)
526 while (panic_cpu != NOCPU)
527 ; /* nothing */
528#endif
529
530 bootopt = RB_AUTOBOOT | RB_DUMP;
531 newpanic = 0;
532 if (panicstr)
533 bootopt |= RB_NOSYNC;
534 else {
535 panicstr = fmt;
536 newpanic = 1;
537 }
538
539 va_start(ap, fmt);
540 if (newpanic) {
541 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
542 panicstr = buf;
543 printf("panic: %s\n", buf);
544 } else {
545 printf("panic: ");
546 vprintf(fmt, ap);
547 printf("\n");
548 }
549 va_end(ap);
550#ifdef SMP
551 printf("cpuid = %d\n", PCPU_GET(cpuid));
552#endif
553
554#ifdef KDB
555 if (newpanic && trace_on_panic)
556 kdb_backtrace();
557 if (debugger_on_panic)
558 kdb_enter(KDB_WHY_PANIC, "panic");
559#ifdef RESTARTABLE_PANICS
560 /* See if the user aborted the panic, in which case we continue. */
561 if (panicstr == NULL) {
562#ifdef SMP
563 atomic_store_rel_int(&panic_cpu, NOCPU);
564#endif
565 return;
566 }
567#endif
568#endif
569 /*thread_lock(td); */
570 td->td_flags |= TDF_INPANIC;
571 /* thread_unlock(td); */
572 if (!sync_on_panic)
573 bootopt |= RB_NOSYNC;
574 critical_exit();
575 boot(bootopt);
576}
577
578/*
579 * Support for poweroff delay.
580 */
581#ifndef POWEROFF_DELAY
582# define POWEROFF_DELAY 5000
583#endif
584static int poweroff_delay = POWEROFF_DELAY;
585
586SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
587 &poweroff_delay, 0, "");
588
589static void
590poweroff_wait(void *junk, int howto)
591{
592
593 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
594 return;
595 DELAY(poweroff_delay * 1000);
596}
597
598/*
599 * Some system processes (e.g. syncer) need to be stopped at appropriate
600 * points in their main loops prior to a system shutdown, so that they
601 * won't interfere with the shutdown process (e.g. by holding a disk buf
602 * to cause sync to fail). For each of these system processes, register
603 * shutdown_kproc() as a handler for one of shutdown events.
604 */
605static int kproc_shutdown_wait = 60;
606SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
607 &kproc_shutdown_wait, 0, "");
608
609void
610kproc_shutdown(void *arg, int howto)
611{
612 struct proc *p;
613 char procname[MAXCOMLEN + 1];
614 int error;
615
616 if (panicstr)
617 return;
618
619 p = (struct proc *)arg;
620 strlcpy(procname, p->p_comm, sizeof(procname));
621 printf("Waiting (max %d seconds) for system process `%s' to stop...",
622 kproc_shutdown_wait, procname);
623 error = kproc_suspend(p, kproc_shutdown_wait * hz);
624
625 if (error == EWOULDBLOCK)
626 printf("timed out\n");
627 else
628 printf("done\n");
629}
630
631void
632kthread_shutdown(void *arg, int howto)
633{
634 struct thread *td;
635 char procname[MAXCOMLEN + 1];
636 int error;
637
638 if (panicstr)
639 return;
640
641 td = (struct thread *)arg;
642 strlcpy(procname, td->td_name, sizeof(procname));
643 printf("Waiting (max %d seconds) for system thread `%s' to stop...",
644 kproc_shutdown_wait, procname);
645 error = kthread_suspend(td, kproc_shutdown_wait * hz);
646
647 if (error == EWOULDBLOCK)
648 printf("timed out\n");
649 else
650 printf("done\n");
651}
652
653/* Registration of dumpers */
654int
655set_dumper(struct dumperinfo *di)
656{
657
658 if (di == NULL) {
659 bzero(&dumper, sizeof dumper);
660 return (0);
661 }
662 if (dumper.dumper != NULL)
663 return (EBUSY);
664 dumper = *di;
665 return (0);
666}
667
668/* Call dumper with bounds checking. */
669int
670dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
671 off_t offset, size_t length)
672{
673
674 if (length != 0 && (offset < di->mediaoffset ||
675 offset - di->mediaoffset + length > di->mediasize)) {
676 printf("Attempt to write outside dump device boundaries.\n");
677 return (ENXIO);
678 }
679 return (di->dumper(di->priv, virtual, physical, offset, length));
680}
681
682void
683mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
684 uint64_t dumplen, uint32_t blksz)
685{
686
687 bzero(kdh, sizeof(*kdh));
688 strncpy(kdh->magic, magic, sizeof(kdh->magic));
689 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
690 kdh->version = htod32(KERNELDUMPVERSION);
691 kdh->architectureversion = htod32(archver);
692 kdh->dumplength = htod64(dumplen);
693 kdh->dumptime = htod64(time_second);
694 kdh->blocksize = htod32(blksz);
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