kern_shutdown.c

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    1 /*-
    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.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   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
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)kern_shutdown.c     8.3 (Berkeley) 1/21/94
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/6.1/sys/kern/kern_shutdown.c 158179 2006-04-30 16:44:43Z cvs2svn $");
   39 
   40 #include "opt_kdb.h"
   41 #include "opt_mac.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/kdb.h>
   54 #include <sys/kernel.h>
   55 #include <sys/kthread.h>
   56 #include <sys/mac.h>
   57 #include <sys/malloc.h>
   58 #include <sys/mount.h>
   59 #include <sys/proc.h>
   60 #include <sys/reboot.h>
   61 #include <sys/resourcevar.h>
   62 #include <sys/sched.h>
   63 #include <sys/smp.h>            /* smp_active */
   64 #include <sys/sysctl.h>
   65 #include <sys/sysproto.h>
   66 
   67 #include <machine/cpu.h>
   68 #include <machine/pcb.h>
   69 #include <machine/smp.h>
   70 
   71 #include <sys/signalvar.h>
   72 
   73 #ifndef PANIC_REBOOT_WAIT_TIME
   74 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
   75 #endif
   76 
   77 /*
   78  * Note that stdarg.h and the ANSI style va_start macro is used for both
   79  * ANSI and traditional C compilers.
   80  */
   81 #include <machine/stdarg.h>
   82 
   83 #ifdef KDB
   84 #ifdef KDB_UNATTENDED
   85 int debugger_on_panic = 0;
   86 #else
   87 int debugger_on_panic = 1;
   88 #endif
   89 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
   90         &debugger_on_panic, 0, "Run debugger on kernel panic");
   91 
   92 #ifdef KDB_TRACE
   93 int trace_on_panic = 1;
   94 #else
   95 int trace_on_panic = 0;
   96 #endif
   97 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
   98         &trace_on_panic, 0, "Print stack trace on kernel panic");
   99 #endif /* KDB */
  100 
  101 int sync_on_panic = 0;
  102 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
  103         &sync_on_panic, 0, "Do a sync before rebooting from a panic");
  104 
  105 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
  106 
  107 /*
  108  * Variable panicstr contains argument to first call to panic; used as flag
  109  * to indicate that the kernel has already called panic.
  110  */
  111 const char *panicstr;
  112 
  113 int dumping;                            /* system is dumping */
  114 int rebooting;                          /* system is rebooting */
  115 static struct dumperinfo dumper;        /* our selected dumper */
  116 
  117 /* Context information for dump-debuggers. */
  118 static struct pcb dumppcb;              /* Registers. */
  119 static lwpid_t dumptid;                 /* Thread ID. */
  120 
  121 static void boot(int) __dead2;
  122 static void poweroff_wait(void *, int);
  123 static void shutdown_halt(void *junk, int howto);
  124 static void shutdown_panic(void *junk, int howto);
  125 static void shutdown_reset(void *junk, int howto);
  126 
  127 /* register various local shutdown events */
  128 static void
  129 shutdown_conf(void *unused)
  130 {
  131 
  132         EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
  133             SHUTDOWN_PRI_FIRST);
  134         EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
  135             SHUTDOWN_PRI_LAST + 100);
  136         EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
  137             SHUTDOWN_PRI_LAST + 100);
  138         EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
  139             SHUTDOWN_PRI_LAST + 200);
  140 }
  141 
  142 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
  143 
  144 /*
  145  * The system call that results in a reboot
  146  *
  147  * MPSAFE
  148  */
  149 /* ARGSUSED */
  150 int
  151 reboot(struct thread *td, struct reboot_args *uap)
  152 {
  153         int error;
  154 
  155         error = 0;
  156 #ifdef MAC
  157         error = mac_check_system_reboot(td->td_ucred, uap->opt);
  158 #endif
  159         if (error == 0)
  160                 error = suser(td);
  161         if (error == 0) {
  162                 mtx_lock(&Giant);
  163                 boot(uap->opt);
  164                 mtx_unlock(&Giant);
  165         }
  166         return (error);
  167 }
  168 
  169 /*
  170  * Called by events that want to shut down.. e.g  <CTL><ALT><DEL> on a PC
  171  */
  172 static int shutdown_howto = 0;
  173 
  174 void
  175 shutdown_nice(int howto)
  176 {
  177 
  178         shutdown_howto = howto;
  179 
  180         /* Send a signal to init(8) and have it shutdown the world */
  181         if (initproc != NULL) {
  182                 PROC_LOCK(initproc);
  183                 psignal(initproc, SIGINT);
  184                 PROC_UNLOCK(initproc);
  185         } else {
  186                 /* No init(8) running, so simply reboot */
  187                 boot(RB_NOSYNC);
  188         }
  189         return;
  190 }
  191 static int      waittime = -1;
  192 
  193 static void
  194 print_uptime(void)
  195 {
  196         int f;
  197         struct timespec ts;
  198 
  199         getnanouptime(&ts);
  200         printf("Uptime: ");
  201         f = 0;
  202         if (ts.tv_sec >= 86400) {
  203                 printf("%ldd", (long)ts.tv_sec / 86400);
  204                 ts.tv_sec %= 86400;
  205                 f = 1;
  206         }
  207         if (f || ts.tv_sec >= 3600) {
  208                 printf("%ldh", (long)ts.tv_sec / 3600);
  209                 ts.tv_sec %= 3600;
  210                 f = 1;
  211         }
  212         if (f || ts.tv_sec >= 60) {
  213                 printf("%ldm", (long)ts.tv_sec / 60);
  214                 ts.tv_sec %= 60;
  215                 f = 1;
  216         }
  217         printf("%lds\n", (long)ts.tv_sec);
  218 }
  219 
  220 static void
  221 doadump(void)
  222 {
  223 
  224         /*
  225          * Sometimes people have to call this from the kernel debugger. 
  226          * (if 'panic' can not dump)
  227          * Give them a clue as to why they can't dump.
  228          */
  229         if (dumper.dumper == NULL) {
  230                 printf("Cannot dump. No dump device defined.\n");
  231                 return;
  232         }
  233 
  234         savectx(&dumppcb);
  235         dumptid = curthread->td_tid;
  236         dumping++;
  237         dumpsys(&dumper);
  238 }
  239 
  240 static int
  241 isbufbusy(struct buf *bp)
  242 {
  243         if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
  244             BUF_REFCNT(bp) > 0) ||
  245             ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
  246                 return (1);
  247         return (0);
  248 }
  249 
  250 /*
  251  * Shutdown the system cleanly to prepare for reboot, halt, or power off.
  252  */
  253 static void
  254 boot(int howto)
  255 {
  256         static int first_buf_printf = 1;
  257 
  258 #if defined(SMP)
  259         /*
  260          * Bind us to CPU 0 so that all shutdown code runs there.  Some
  261          * systems don't shutdown properly (i.e., ACPI power off) if we
  262          * run on another processor.
  263          */
  264         mtx_lock_spin(&sched_lock);
  265         sched_bind(curthread, 0);
  266         mtx_unlock_spin(&sched_lock);
  267         KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
  268 #endif
  269         /* We're in the process of rebooting. */
  270         rebooting = 1;
  271 
  272         /* collect extra flags that shutdown_nice might have set */
  273         howto |= shutdown_howto;
  274 
  275         /* We are out of the debugger now. */
  276         kdb_active = 0;
  277 
  278         /*
  279          * Do any callouts that should be done BEFORE syncing the filesystems.
  280          */
  281         EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
  282 
  283         /* 
  284          * Now sync filesystems
  285          */
  286         if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
  287                 register struct buf *bp;
  288                 int iter, nbusy, pbusy;
  289 #ifndef PREEMPTION
  290                 int subiter;
  291 #endif
  292 
  293                 waittime = 0;
  294 
  295                 sync(curthread, NULL);
  296 
  297                 /*
  298                  * With soft updates, some buffers that are
  299                  * written will be remarked as dirty until other
  300                  * buffers are written.
  301                  */
  302                 for (iter = pbusy = 0; iter < 20; iter++) {
  303                         nbusy = 0;
  304                         for (bp = &buf[nbuf]; --bp >= buf; )
  305                                 if (isbufbusy(bp))
  306                                         nbusy++;
  307                         if (nbusy == 0) {
  308                                 if (first_buf_printf)
  309                                         printf("All buffers synced.");
  310                                 break;
  311                         }
  312                         if (first_buf_printf) {
  313                                 printf("Syncing disks, buffers remaining... ");
  314                                 first_buf_printf = 0;
  315                         }
  316                         printf("%d ", nbusy);
  317                         if (nbusy < pbusy)
  318                                 iter = 0;
  319                         pbusy = nbusy;
  320                         sync(curthread, NULL);
  321 
  322 #ifdef PREEMPTION
  323                         /*
  324                          * Drop Giant and spin for a while to allow
  325                          * interrupt threads to run.
  326                          */
  327                         DROP_GIANT();
  328                         DELAY(50000 * iter);
  329                         PICKUP_GIANT();
  330 #else
  331                         /*
  332                          * Drop Giant and context switch several times to
  333                          * allow interrupt threads to run.
  334                          */
  335                         DROP_GIANT();
  336                         for (subiter = 0; subiter < 50 * iter; subiter++) {
  337                                 mtx_lock_spin(&sched_lock);
  338                                 mi_switch(SW_VOL, NULL);
  339                                 mtx_unlock_spin(&sched_lock);
  340                                 DELAY(1000);
  341                         }
  342                         PICKUP_GIANT();
  343 #endif
  344                 }
  345                 printf("\n");
  346                 /*
  347                  * Count only busy local buffers to prevent forcing 
  348                  * a fsck if we're just a client of a wedged NFS server
  349                  */
  350                 nbusy = 0;
  351                 for (bp = &buf[nbuf]; --bp >= buf; ) {
  352                         if (isbufbusy(bp)) {
  353 #if 0
  354 /* XXX: This is bogus.  We should probably have a BO_REMOTE flag instead */
  355                                 if (bp->b_dev == NULL) {
  356                                         TAILQ_REMOVE(&mountlist,
  357                                             bp->b_vp->v_mount, mnt_list);
  358                                         continue;
  359                                 }
  360 #endif
  361                                 nbusy++;
  362 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
  363                                 printf(
  364                             "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
  365                                     nbusy, bp->b_bufobj,
  366                                     bp->b_flags, (long)bp->b_blkno,
  367                                     (long)bp->b_lblkno);
  368 #endif
  369                         }
  370                 }
  371                 if (nbusy) {
  372                         /*
  373                          * Failed to sync all blocks. Indicate this and don't
  374                          * unmount filesystems (thus forcing an fsck on reboot).
  375                          */
  376                         printf("Giving up on %d buffers\n", nbusy);
  377                         DELAY(5000000); /* 5 seconds */
  378                 } else {
  379                         if (!first_buf_printf)
  380                                 printf("Final sync complete\n");
  381                         /*
  382                          * Unmount filesystems
  383                          */
  384                         if (panicstr == 0)
  385                                 vfs_unmountall();
  386                 }
  387                 DELAY(100000);          /* wait for console output to finish */
  388         }
  389 
  390         print_uptime();
  391 
  392         /*
  393          * Ok, now do things that assume all filesystem activity has
  394          * been completed.
  395          */
  396         EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
  397 
  398         /* XXX This doesn't disable interrupts any more.  Reconsider? */
  399         splhigh();
  400 
  401         if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 
  402                 doadump();
  403 
  404         /* Now that we're going to really halt the system... */
  405         EVENTHANDLER_INVOKE(shutdown_final, howto);
  406 
  407         for(;;) ;       /* safety against shutdown_reset not working */
  408         /* NOTREACHED */
  409 }
  410 
  411 /*
  412  * If the shutdown was a clean halt, behave accordingly.
  413  */
  414 static void
  415 shutdown_halt(void *junk, int howto)
  416 {
  417 
  418         if (howto & RB_HALT) {
  419                 printf("\n");
  420                 printf("The operating system has halted.\n");
  421                 printf("Please press any key to reboot.\n\n");
  422                 switch (cngetc()) {
  423                 case -1:                /* No console, just die */
  424                         cpu_halt();
  425                         /* NOTREACHED */
  426                 default:
  427                         howto &= ~RB_HALT;
  428                         break;
  429                 }
  430         }
  431 }
  432 
  433 /*
  434  * Check to see if the system paniced, pause and then reboot
  435  * according to the specified delay.
  436  */
  437 static void
  438 shutdown_panic(void *junk, int howto)
  439 {
  440         int loop;
  441 
  442         if (howto & RB_DUMP) {
  443                 if (PANIC_REBOOT_WAIT_TIME != 0) {
  444                         if (PANIC_REBOOT_WAIT_TIME != -1) {
  445                                 printf("Automatic reboot in %d seconds - "
  446                                        "press a key on the console to abort\n",
  447                                         PANIC_REBOOT_WAIT_TIME);
  448                                 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
  449                                      loop > 0; --loop) {
  450                                         DELAY(1000 * 100); /* 1/10th second */
  451                                         /* Did user type a key? */
  452                                         if (cncheckc() != -1)
  453                                                 break;
  454                                 }
  455                                 if (!loop)
  456                                         return;
  457                         }
  458                 } else { /* zero time specified - reboot NOW */
  459                         return;
  460                 }
  461                 printf("--> Press a key on the console to reboot,\n");
  462                 printf("--> or switch off the system now.\n");
  463                 cngetc();
  464         }
  465 }
  466 
  467 /*
  468  * Everything done, now reset
  469  */
  470 static void
  471 shutdown_reset(void *junk, int howto)
  472 {
  473 
  474         printf("Rebooting...\n");
  475         DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
  476         /* cpu_boot(howto); */ /* doesn't do anything at the moment */
  477         cpu_reset();
  478         /* NOTREACHED */ /* assuming reset worked */
  479 }
  480 
  481 #ifdef SMP
  482 static u_int panic_cpu = NOCPU;
  483 #endif
  484 
  485 /*
  486  * Panic is called on unresolvable fatal errors.  It prints "panic: mesg",
  487  * and then reboots.  If we are called twice, then we avoid trying to sync
  488  * the disks as this often leads to recursive panics.
  489  *
  490  * MPSAFE
  491  */
  492 void
  493 panic(const char *fmt, ...)
  494 {
  495         struct thread *td = curthread;
  496         int bootopt, newpanic;
  497         va_list ap;
  498         static char buf[256];
  499 
  500 #ifdef SMP
  501         /*
  502          * We don't want multiple CPU's to panic at the same time, so we
  503          * use panic_cpu as a simple spinlock.  We have to keep checking
  504          * panic_cpu if we are spinning in case the panic on the first
  505          * CPU is canceled.
  506          */
  507         if (panic_cpu != PCPU_GET(cpuid))
  508                 while (atomic_cmpset_int(&panic_cpu, NOCPU,
  509                     PCPU_GET(cpuid)) == 0)
  510                         while (panic_cpu != NOCPU)
  511                                 ; /* nothing */
  512 #endif
  513 
  514         bootopt = RB_AUTOBOOT | RB_DUMP;
  515         newpanic = 0;
  516         if (panicstr)
  517                 bootopt |= RB_NOSYNC;
  518         else {
  519                 panicstr = fmt;
  520                 newpanic = 1;
  521         }
  522 
  523         va_start(ap, fmt);
  524         if (newpanic) {
  525                 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
  526                 panicstr = buf;
  527                 printf("panic: %s\n", buf);
  528         } else {
  529                 printf("panic: ");
  530                 vprintf(fmt, ap);
  531                 printf("\n");
  532         }
  533         va_end(ap);
  534 #ifdef SMP
  535         printf("cpuid = %d\n", PCPU_GET(cpuid));
  536 #endif
  537 
  538 #ifdef KDB
  539         if (newpanic && trace_on_panic)
  540                 kdb_backtrace();
  541         if (debugger_on_panic)
  542                 kdb_enter("panic");
  543 #ifdef RESTARTABLE_PANICS
  544         /* See if the user aborted the panic, in which case we continue. */
  545         if (panicstr == NULL) {
  546 #ifdef SMP
  547                 atomic_store_rel_int(&panic_cpu, NOCPU);
  548 #endif
  549                 return;
  550         }
  551 #endif
  552 #endif
  553         mtx_lock_spin(&sched_lock);
  554         td->td_flags |= TDF_INPANIC;
  555         mtx_unlock_spin(&sched_lock);
  556         if (!sync_on_panic)
  557                 bootopt |= RB_NOSYNC;
  558         boot(bootopt);
  559 }
  560 
  561 /*
  562  * Support for poweroff delay.
  563  */
  564 #ifndef POWEROFF_DELAY
  565 # define POWEROFF_DELAY 5000
  566 #endif
  567 static int poweroff_delay = POWEROFF_DELAY;
  568 
  569 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
  570         &poweroff_delay, 0, "");
  571 
  572 static void
  573 poweroff_wait(void *junk, int howto)
  574 {
  575 
  576         if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
  577                 return;
  578         DELAY(poweroff_delay * 1000);
  579 }
  580 
  581 /*
  582  * Some system processes (e.g. syncer) need to be stopped at appropriate
  583  * points in their main loops prior to a system shutdown, so that they
  584  * won't interfere with the shutdown process (e.g. by holding a disk buf
  585  * to cause sync to fail).  For each of these system processes, register
  586  * shutdown_kproc() as a handler for one of shutdown events.
  587  */
  588 static int kproc_shutdown_wait = 60;
  589 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
  590     &kproc_shutdown_wait, 0, "");
  591 
  592 void
  593 kproc_shutdown(void *arg, int howto)
  594 {
  595         struct proc *p;
  596         char procname[MAXCOMLEN + 1];
  597         int error;
  598 
  599         if (panicstr)
  600                 return;
  601 
  602         p = (struct proc *)arg;
  603         strlcpy(procname, p->p_comm, sizeof(procname));
  604         printf("Waiting (max %d seconds) for system process `%s' to stop...",
  605             kproc_shutdown_wait, procname);
  606         error = kthread_suspend(p, kproc_shutdown_wait * hz);
  607 
  608         if (error == EWOULDBLOCK)
  609                 printf("timed out\n");
  610         else
  611                 printf("done\n");
  612 }
  613 
  614 /* Registration of dumpers */
  615 int
  616 set_dumper(struct dumperinfo *di)
  617 {
  618 
  619         if (di == NULL) {
  620                 bzero(&dumper, sizeof dumper);
  621                 return (0);
  622         }
  623         if (dumper.dumper != NULL)
  624                 return (EBUSY);
  625         dumper = *di;
  626         return (0);
  627 }
  628 
  629 #if defined(__powerpc__)
  630 void
  631 dumpsys(struct dumperinfo *di __unused)
  632 {
  633 
  634         printf("Kernel dumps not implemented on this architecture\n");
  635 }
  636 #endif
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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_shutdown.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_shutdown.c
