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  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Berkeley and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  *      @(#)kern_shutdown.c     8.3 (Berkeley) 1/21/94
   39  */
   40 
   41 #include <sys/cdefs.h>
   42 __FBSDID("$FreeBSD: releng/5.2/sys/kern/kern_shutdown.c 118990 2003-08-16 16:57:57Z marcel $");
   43 
   44 #include "opt_ddb.h"
   45 #include "opt_ddb_trace.h"
   46 #include "opt_ddb_unattended.h"
   47 #include "opt_hw_wdog.h"
   48 #include "opt_mac.h"
   49 #include "opt_panic.h"
   50 #include "opt_show_busybufs.h"
   51 
   52 #include <sys/param.h>
   53 #include <sys/systm.h>
   54 #include <sys/bio.h>
   55 #include <sys/buf.h>
   56 #include <sys/conf.h>
   57 #include <sys/cons.h>
   58 #include <sys/eventhandler.h>
   59 #include <sys/kernel.h>
   60 #include <sys/kthread.h>
   61 #include <sys/mac.h>
   62 #include <sys/malloc.h>
   63 #include <sys/mount.h>
   64 #include <sys/proc.h>
   65 #include <sys/reboot.h>
   66 #include <sys/resourcevar.h>
   67 #include <sys/smp.h>            /* smp_active */
   68 #include <sys/sysctl.h>
   69 #include <sys/sysproto.h>
   70 #include <sys/vnode.h>
   71 
   72 #include <machine/cpu.h>
   73 #include <machine/pcb.h>
   74 #include <machine/smp.h>
   75 
   76 #include <sys/signalvar.h>
   77 #ifdef DDB
   78 #include <ddb/ddb.h>
   79 #endif
   80 
   81 #ifndef PANIC_REBOOT_WAIT_TIME
   82 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
   83 #endif
   84 
   85 /*
   86  * Note that stdarg.h and the ANSI style va_start macro is used for both
   87  * ANSI and traditional C compilers.
   88  */
   89 #include <machine/stdarg.h>
   90 
   91 #ifdef DDB
   92 #ifdef DDB_UNATTENDED
   93 int debugger_on_panic = 0;
   94 #else
   95 int debugger_on_panic = 1;
   96 #endif
   97 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
   98         &debugger_on_panic, 0, "Run debugger on kernel panic");
   99 
  100 #ifdef DDB_TRACE
  101 int trace_on_panic = 1;
  102 #else
  103 int trace_on_panic = 0;
  104 #endif
  105 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
  106         &trace_on_panic, 0, "Print stack trace on kernel panic");
  107 #endif
  108 
  109 int sync_on_panic = 1;
  110 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
  111         &sync_on_panic, 0, "Do a sync before rebooting from a panic");
  112 
  113 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
  114 
  115 #ifdef  HW_WDOG
  116 /*
  117  * If there is a hardware watchdog, point this at the function needed to
  118  * hold it off.
  119  * It's needed when the kernel needs to do some lengthy operations.
  120  * e.g. in wd.c when dumping core.. It's most annoying to have
  121  * your precious core-dump only half written because the wdog kicked in.
  122  */
  123 watchdog_tickle_fn wdog_tickler = NULL;
  124 #endif  /* HW_WDOG */
  125 
  126 /*
  127  * Variable panicstr contains argument to first call to panic; used as flag
  128  * to indicate that the kernel has already called panic.
  129  */
  130 const char *panicstr;
  131 
  132 int dumping;                            /* system is dumping */
  133 static struct dumperinfo dumper;        /* our selected dumper */
  134 static struct pcb dumppcb;              /* "You Are Here" sign for dump-debuggers */
  135 
  136 static void boot(int) __dead2;
  137 static void poweroff_wait(void *, int);
  138 static void shutdown_halt(void *junk, int howto);
  139 static void shutdown_panic(void *junk, int howto);
  140 static void shutdown_reset(void *junk, int howto);
  141 
  142 /* register various local shutdown events */
  143 static void
  144 shutdown_conf(void *unused)
  145 {
  146 
  147         EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
  148             SHUTDOWN_PRI_FIRST);
  149         EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
  150             SHUTDOWN_PRI_LAST + 100);
  151         EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
  152             SHUTDOWN_PRI_LAST + 100);
  153         EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
  154             SHUTDOWN_PRI_LAST + 200);
  155 }
  156 
  157 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
  158 
  159 /*
  160  * The system call that results in a reboot
  161  *
  162  * MPSAFE
  163  */
  164 /* ARGSUSED */
  165 int
  166 reboot(struct thread *td, struct reboot_args *uap)
  167 {
  168         int error;
  169 
  170         error = 0;
  171 #ifdef MAC
  172         error = mac_check_system_reboot(td->td_ucred, uap->opt);
  173 #endif
  174         if (error == 0)
  175                 error = suser(td);
  176         if (error == 0) {
  177                 mtx_lock(&Giant);
  178                 boot(uap->opt);
  179                 mtx_unlock(&Giant);
  180         }
  181         return (error);
  182 }
  183 
  184 /*
  185  * Called by events that want to shut down.. e.g  <CTL><ALT><DEL> on a PC
  186  */
  187 static int shutdown_howto = 0;
  188 
  189 void
  190 shutdown_nice(int howto)
  191 {
  192 
  193         shutdown_howto = howto;
  194 
  195         /* Send a signal to init(8) and have it shutdown the world */
  196         if (initproc != NULL) {
  197                 PROC_LOCK(initproc);
  198                 psignal(initproc, SIGINT);
  199                 PROC_UNLOCK(initproc);
  200         } else {
  201                 /* No init(8) running, so simply reboot */
  202                 boot(RB_NOSYNC);
  203         }
  204         return;
  205 }
  206 static int      waittime = -1;
  207 
  208 static void
  209 print_uptime(void)
  210 {
  211         int f;
  212         struct timespec ts;
  213 
  214         getnanouptime(&ts);
  215         printf("Uptime: ");
  216         f = 0;
  217         if (ts.tv_sec >= 86400) {
  218                 printf("%ldd", (long)ts.tv_sec / 86400);
  219                 ts.tv_sec %= 86400;
  220                 f = 1;
  221         }
  222         if (f || ts.tv_sec >= 3600) {
  223                 printf("%ldh", (long)ts.tv_sec / 3600);
  224                 ts.tv_sec %= 3600;
  225                 f = 1;
  226         }
  227         if (f || ts.tv_sec >= 60) {
  228                 printf("%ldm", (long)ts.tv_sec / 60);
  229                 ts.tv_sec %= 60;
  230                 f = 1;
  231         }
  232         printf("%lds\n", (long)ts.tv_sec);
  233 }
  234 
  235 static void
  236 doadump(void)
  237 {
  238 
  239         savectx(&dumppcb);
  240         dumping++;
  241         dumpsys(&dumper);
  242 }
  243 
  244 /*
  245  *  Go through the rigmarole of shutting down..
  246  * this used to be in machdep.c but I'll be dammned if I could see
  247  * anything machine dependant in it.
  248  */
  249 static void
  250 boot(int howto)
  251 {
  252 
  253         /* collect extra flags that shutdown_nice might have set */
  254         howto |= shutdown_howto;
  255 
  256 #ifdef DDB
  257         /* We are out of the debugger now. */
  258         db_active = 0;
  259 #endif
  260 
  261 #ifdef SMP
  262         if (smp_active)
  263                 printf("boot() called on cpu#%d\n", PCPU_GET(cpuid));
  264 #endif
  265         /*
  266          * Do any callouts that should be done BEFORE syncing the filesystems.
  267          */
  268         EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
  269 
  270         /* 
  271          * Now sync filesystems
  272          */
  273         if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
  274                 register struct buf *bp;
  275                 int iter, nbusy, pbusy;
  276                 int subiter;
  277 
  278                 waittime = 0;
  279                 printf("\nsyncing disks, buffers remaining... ");
  280 
  281                 sync(&thread0, NULL);
  282 
  283                 /*
  284                  * With soft updates, some buffers that are
  285                  * written will be remarked as dirty until other
  286                  * buffers are written.
  287                  */
  288                 for (iter = pbusy = 0; iter < 20; iter++) {
  289                         nbusy = 0;
  290                         for (bp = &buf[nbuf]; --bp >= buf; ) {
  291                                 if ((bp->b_flags & B_INVAL) == 0 &&
  292                                     BUF_REFCNT(bp) > 0) {
  293                                         nbusy++;
  294                                 } else if ((bp->b_flags & (B_DELWRI | B_INVAL))
  295                                                 == B_DELWRI) {
  296                                         /* bawrite(bp);*/
  297                                         nbusy++;
  298                                 }
  299                         }
  300                         if (nbusy == 0)
  301                                 break;
  302                         printf("%d ", nbusy);
  303                         if (nbusy < pbusy)
  304                                 iter = 0;
  305                         pbusy = nbusy;
  306                         sync(&thread0, NULL);
  307                         if (curthread != NULL) {
  308                                 DROP_GIANT();
  309                                 for (subiter = 0; subiter < 50 * iter; subiter++) {
  310                                         mtx_lock_spin(&sched_lock);
  311                                         curthread->td_proc->p_stats->p_ru.ru_nvcsw++;
  312                                         mi_switch(); /* Allow interrupt threads to run */
  313                                         mtx_unlock_spin(&sched_lock);
  314                                         DELAY(1000);
  315                                 }
  316                                 PICKUP_GIANT();
  317                         } else
  318                         DELAY(50000 * iter);
  319                 }
  320                 printf("\n");
  321                 /*
  322                  * Count only busy local buffers to prevent forcing 
  323                  * a fsck if we're just a client of a wedged NFS server
  324                  */
  325                 nbusy = 0;
  326                 for (bp = &buf[nbuf]; --bp >= buf; ) {
  327                         if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
  328                             ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
  329                                 if (bp->b_dev == NODEV) {
  330                                         TAILQ_REMOVE(&mountlist,
  331                                             bp->b_vp->v_mount, mnt_list);
  332                                         continue;
  333                                 }
  334                                 nbusy++;
  335 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
  336                                 printf(
  337                             "%d: dev:%s, flags:%0x, blkno:%ld, lblkno:%ld\n",
  338                                     nbusy, devtoname(bp->b_dev),
  339                                     bp->b_flags, (long)bp->b_blkno,
  340                                     (long)bp->b_lblkno);
  341 #endif
  342                         }
  343                 }
  344                 if (nbusy) {
  345                         /*
  346                          * Failed to sync all blocks. Indicate this and don't
  347                          * unmount filesystems (thus forcing an fsck on reboot).
  348                          */
  349                         printf("giving up on %d buffers\n", nbusy);
  350                         DELAY(5000000); /* 5 seconds */
  351                 } else {
  352                         printf("done\n");
  353                         /*
  354                          * Unmount filesystems
  355                          */
  356                         if (panicstr == 0)
  357                                 vfs_unmountall();
  358                 }
  359                 DELAY(100000);          /* wait for console output to finish */
  360         }
  361 
  362         print_uptime();
  363 
  364         /*
  365          * Ok, now do things that assume all filesystem activity has
  366          * been completed.
  367          */
  368         EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
  369         splhigh();
  370         if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP &&
  371             !cold && dumper.dumper != NULL && !dumping) 
  372                 doadump();
  373 
  374         /* Now that we're going to really halt the system... */
  375         EVENTHANDLER_INVOKE(shutdown_final, howto);
  376 
  377         for(;;) ;       /* safety against shutdown_reset not working */
  378         /* NOTREACHED */
  379 }
  380 
  381 /*
  382  * If the shutdown was a clean halt, behave accordingly.
  383  */
  384 static void
  385 shutdown_halt(void *junk, int howto)
  386 {
  387 
  388         if (howto & RB_HALT) {
  389                 printf("\n");
  390                 printf("The operating system has halted.\n");
  391                 printf("Please press any key to reboot.\n\n");
  392                 switch (cngetc()) {
  393                 case -1:                /* No console, just die */
  394                         cpu_halt();
  395                         /* NOTREACHED */
  396                 default:
  397                         howto &= ~RB_HALT;
  398                         break;
  399                 }
  400         }
  401 }
  402 
  403 /*
  404  * Check to see if the system paniced, pause and then reboot
  405  * according to the specified delay.
  406  */
  407 static void
  408 shutdown_panic(void *junk, int howto)
  409 {
  410         int loop;
  411 
  412         if (howto & RB_DUMP) {
  413                 if (PANIC_REBOOT_WAIT_TIME != 0) {
  414                         if (PANIC_REBOOT_WAIT_TIME != -1) {
  415                                 printf("Automatic reboot in %d seconds - "
  416                                        "press a key on the console to abort\n",
  417                                         PANIC_REBOOT_WAIT_TIME);
  418                                 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
  419                                      loop > 0; --loop) {
  420                                         DELAY(1000 * 100); /* 1/10th second */
  421                                         /* Did user type a key? */
  422                                         if (cncheckc() != -1)
  423                                                 break;
  424                                 }
  425                                 if (!loop)
  426                                         return;
  427                         }
  428                 } else { /* zero time specified - reboot NOW */
  429                         return;
  430                 }
  431                 printf("--> Press a key on the console to reboot,\n");
  432                 printf("--> or switch off the system now.\n");
  433                 cngetc();
  434         }
  435 }
  436 
  437 /*
  438  * Everything done, now reset
  439  */
  440 static void
  441 shutdown_reset(void *junk, int howto)
  442 {
  443 
  444         printf("Rebooting...\n");
  445         DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
  446         /* cpu_boot(howto); */ /* doesn't do anything at the moment */
  447         cpu_reset();
  448         /* NOTREACHED */ /* assuming reset worked */
  449 }
  450 
  451 /*
  452  * Print a backtrace if we can.
  453  */
  454 
  455 void
  456 backtrace(void)
  457 {
  458 
  459 #ifdef DDB
  460         printf("Stack backtrace:\n");
  461         db_print_backtrace();
  462 #else
  463         printf("Sorry, need DDB option to print backtrace");
  464 #endif
  465 }
  466 
  467 #ifdef SMP
  468 static u_int panic_cpu = NOCPU;
  469 #endif
  470 
  471 /*
  472  * Panic is called on unresolvable fatal errors.  It prints "panic: mesg",
  473  * and then reboots.  If we are called twice, then we avoid trying to sync
  474  * the disks as this often leads to recursive panics.
  475  *
  476  * MPSAFE
  477  */
  478 void
  479 panic(const char *fmt, ...)
  480 {
  481         struct thread *td = curthread;
  482         int bootopt, newpanic;
  483         va_list ap;
  484         static char buf[256];
  485 
  486 #ifdef SMP
  487         /*
  488          * We don't want multiple CPU's to panic at the same time, so we
  489          * use panic_cpu as a simple spinlock.  We have to keep checking
  490          * panic_cpu if we are spinning in case the panic on the first
  491          * CPU is canceled.
  492          */
  493         if (panic_cpu != PCPU_GET(cpuid))
  494                 while (atomic_cmpset_int(&panic_cpu, NOCPU,
  495                     PCPU_GET(cpuid)) == 0)
  496                         while (panic_cpu != NOCPU)
  497                                 ; /* nothing */
  498 #endif
  499 
  500         bootopt = RB_AUTOBOOT | RB_DUMP;
  501         newpanic = 0;
  502         if (panicstr)
  503                 bootopt |= RB_NOSYNC;
  504         else {
  505                 panicstr = fmt;
  506                 newpanic = 1;
  507         }
  508 
  509         va_start(ap, fmt);
  510         if (newpanic) {
  511                 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
  512                 panicstr = buf;
  513                 printf("panic: %s\n", buf);
  514         } else {
  515                 printf("panic: ");
  516                 vprintf(fmt, ap);
  517                 printf("\n");
  518         }
  519         va_end(ap);
  520 #ifdef SMP
  521         /* two separate prints in case of an unmapped page and trap */
  522         printf("cpuid = %d; ", PCPU_GET(cpuid));
  523 #ifdef APIC_IO
  524         printf("lapic.id = %08x\n", lapic.id);
  525 #else
  526         printf("\n");
  527 #endif
  528 #endif
  529 
  530 #if defined(DDB)
  531         if (newpanic && trace_on_panic)
  532                 backtrace();
  533         if (debugger_on_panic)
  534                 Debugger ("panic");
  535 #ifdef RESTARTABLE_PANICS
  536         /* See if the user aborted the panic, in which case we continue. */
  537         if (panicstr == NULL) {
  538 #ifdef SMP
  539                 atomic_store_rel_int(&panic_cpu, NOCPU);
  540 #endif
  541                 return;
  542         }
  543 #endif
  544 #endif
  545         mtx_lock_spin(&sched_lock);
  546         td->td_flags |= TDF_INPANIC;
  547         mtx_unlock_spin(&sched_lock);
  548         if (!sync_on_panic)
  549                 bootopt |= RB_NOSYNC;
  550         boot(bootopt);
  551 }
  552 
  553 /*
  554  * Support for poweroff delay.
  555  */
  556 #ifndef POWEROFF_DELAY
  557 # define POWEROFF_DELAY 5000
  558 #endif
  559 static int poweroff_delay = POWEROFF_DELAY;
  560 
  561 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
  562         &poweroff_delay, 0, "");
  563 
  564 static void
  565 poweroff_wait(void *junk, int howto)
  566 {
  567 
  568         if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
  569                 return;
  570         DELAY(poweroff_delay * 1000);
  571 }
  572 
  573 /*
  574  * Some system processes (e.g. syncer) need to be stopped at appropriate
  575  * points in their main loops prior to a system shutdown, so that they
  576  * won't interfere with the shutdown process (e.g. by holding a disk buf
  577  * to cause sync to fail).  For each of these system processes, register
  578  * shutdown_kproc() as a handler for one of shutdown events.
  579  */
  580 static int kproc_shutdown_wait = 60;
  581 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
  582     &kproc_shutdown_wait, 0, "");
  583 
  584 void
  585 kproc_shutdown(void *arg, int howto)
  586 {
  587         struct proc *p;
  588         int error;
  589 
  590         if (panicstr)
  591                 return;
  592 
  593         p = (struct proc *)arg;
  594         printf("Waiting (max %d seconds) for system process `%s' to stop...",
  595             kproc_shutdown_wait, p->p_comm);
  596         error = kthread_suspend(p, kproc_shutdown_wait * hz);
  597 
  598         if (error == EWOULDBLOCK)
  599                 printf("timed out\n");
  600         else
  601                 printf("stopped\n");
  602 }
  603 
  604 /* Registration of dumpers */
  605 int
  606 set_dumper(struct dumperinfo *di)
  607 {
  608 
  609         if (di == NULL) {
  610                 bzero(&dumper, sizeof dumper);
  611                 return (0);
  612         }
  613         if (dumper.dumper != NULL)
  614                 return (EBUSY);
  615         dumper = *di;
  616         return (0);
  617 }
  618 
  619 #if defined(__powerpc__)
  620 void
  621 dumpsys(struct dumperinfo *di __unused)
  622 {
  623 
  624         printf("Kernel dumps not implemented on this architecture\n");
  625 }
  626 #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
