minidump_machdep.c

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    1 /*-
    2  * Copyright (c) 2006 Peter Wemm
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  *
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.2/sys/i386/i386/minidump_machdep.c 217130 2011-01-07 23:11:19Z cperciva $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/conf.h>
   33 #include <sys/cons.h>
   34 #include <sys/kernel.h>
   35 #include <sys/kerneldump.h>
   36 #include <sys/msgbuf.h>
   37 #include <vm/vm.h>
   38 #include <vm/pmap.h>
   39 #include <machine/atomic.h>
   40 #include <machine/elf.h>
   41 #include <machine/md_var.h>
   42 #include <machine/vmparam.h>
   43 #include <machine/minidump.h>
   44 
   45 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   46 
   47 /*
   48  * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
   49  * is to protect us from metadata and to protect metadata from us.
   50  */
   51 #define SIZEOF_METADATA         (64*1024)
   52 
   53 #define MD_ALIGN(x)     (((off_t)(x) + PAGE_MASK) & ~PAGE_MASK)
   54 #define DEV_ALIGN(x)    (((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1))
   55 
   56 uint32_t *vm_page_dump;
   57 int vm_page_dump_size;
   58 
   59 static struct kerneldumpheader kdh;
   60 static off_t dumplo;
   61 
   62 /* Handle chunked writes. */
   63 static size_t fragsz;
   64 static void *dump_va;
   65 static uint64_t counter, progress;
   66 
   67 CTASSERT(sizeof(*vm_page_dump) == 4);
   68 #ifndef XEN
   69 #define xpmap_mtop(x) (x)
   70 #define xpmap_ptom(x) (x)
   71 #endif
   72 
   73 
   74 static int
   75 is_dumpable(vm_paddr_t pa)
   76 {
   77         int i;
   78 
   79         for (i = 0; dump_avail[i] != 0 || dump_avail[i + 1] != 0; i += 2) {
   80                 if (pa >= dump_avail[i] && pa < dump_avail[i + 1])
   81                         return (1);
   82         }
   83         return (0);
   84 }
   85 
   86 #define PG2MB(pgs) (((pgs) + (1 << 8) - 1) >> 8)
   87 
   88 static int
   89 blk_flush(struct dumperinfo *di)
   90 {
   91         int error;
   92 
   93         if (fragsz == 0)
   94                 return (0);
   95 
   96         error = dump_write(di, dump_va, 0, dumplo, fragsz);
   97         dumplo += fragsz;
   98         fragsz = 0;
   99         return (error);
  100 }
  101 
  102 static int
  103 blk_write(struct dumperinfo *di, char *ptr, vm_paddr_t pa, size_t sz)
  104 {
  105         size_t len;
  106         int error, i, c;
  107         u_int maxdumpsz;
  108 
  109         maxdumpsz = min(di->maxiosize, MAXDUMPPGS * PAGE_SIZE);
  110         if (maxdumpsz == 0)     /* seatbelt */
  111                 maxdumpsz = PAGE_SIZE;
  112         error = 0;
  113         if ((sz % PAGE_SIZE) != 0) {
  114                 printf("size not page aligned\n");
  115                 return (EINVAL);
  116         }
  117         if (ptr != NULL && pa != 0) {
  118                 printf("cant have both va and pa!\n");
  119                 return (EINVAL);
  120         }
  121         if (pa != 0 && (((uintptr_t)ptr) % PAGE_SIZE) != 0) {
  122                 printf("address not page aligned\n");
  123                 return (EINVAL);
  124         }
  125         if (ptr != NULL) {
  126                 /* If we're doing a virtual dump, flush any pre-existing pa pages */
  127                 error = blk_flush(di);
  128                 if (error)
  129                         return (error);
  130         }
  131         while (sz) {
  132                 len = maxdumpsz - fragsz;
  133                 if (len > sz)
  134                         len = sz;
  135                 counter += len;
  136                 progress -= len;
  137                 if (counter >> 24) {
  138                         printf(" %lld", PG2MB(progress >> PAGE_SHIFT));
  139                         counter &= (1<<24) - 1;
  140                 }
  141                 if (ptr) {
  142                         error = dump_write(di, ptr, 0, dumplo, len);
  143                         if (error)
  144                                 return (error);
  145                         dumplo += len;
  146                         ptr += len;
  147                         sz -= len;
  148                 } else {
  149                         for (i = 0; i < len; i += PAGE_SIZE)
  150                                 dump_va = pmap_kenter_temporary(pa + i, (i + fragsz) >> PAGE_SHIFT);
  151                         fragsz += len;
  152                         pa += len;
  153                         sz -= len;
  154                         if (fragsz == maxdumpsz) {
  155                                 error = blk_flush(di);
  156                                 if (error)
  157                                         return (error);
  158                         }
  159                 }
  160 
  161                 /* Check for user abort. */
  162                 c = cncheckc();
  163                 if (c == 0x03)
  164                         return (ECANCELED);
  165                 if (c != -1)
  166                         printf(" (CTRL-C to abort) ");
  167         }
  168 
  169         return (0);
  170 }
  171 
  172 /* A fake page table page, to avoid having to handle both 4K and 2M pages */
  173 static pt_entry_t fakept[NPTEPG];
  174 
  175 void
  176 minidumpsys(struct dumperinfo *di)
  177 {
  178         uint64_t dumpsize;
  179         uint32_t ptesize;
  180         vm_offset_t va;
  181         int error;
  182         uint32_t bits;
  183         uint64_t pa;
  184         pd_entry_t *pd;
  185         pt_entry_t *pt;
  186         int i, j, k, bit;
  187         struct minidumphdr mdhdr;
  188 
  189         counter = 0;
  190         /* Walk page table pages, set bits in vm_page_dump */
  191         ptesize = 0;
  192         for (va = KERNBASE; va < kernel_vm_end; va += NBPDR) {
  193                 /*
  194                  * We always write a page, even if it is zero. Each
  195                  * page written corresponds to 2MB of space
  196                  */
  197                 ptesize += PAGE_SIZE;
  198                 pd = (pd_entry_t *)((uintptr_t)IdlePTD + KERNBASE);     /* always mapped! */
  199                 j = va >> PDRSHIFT;
  200                 if ((pd[j] & (PG_PS | PG_V)) == (PG_PS | PG_V))  {
  201                         /* This is an entire 2M page. */
  202                         pa = xpmap_mtop(pd[j] & PG_PS_FRAME);
  203                         for (k = 0; k < NPTEPG; k++) {
  204                                 if (is_dumpable(pa))
  205                                         dump_add_page(pa);
  206                                 pa += PAGE_SIZE;
  207                         }
  208                         continue;
  209                 }
  210                 if ((pd[j] & PG_V) == PG_V) {
  211                         /* set bit for each valid page in this 2MB block */
  212                         pt = pmap_kenter_temporary(xpmap_mtop(pd[j] & PG_FRAME), 0);
  213                         for (k = 0; k < NPTEPG; k++) {
  214                                 if ((pt[k] & PG_V) == PG_V) {
  215                                         pa = xpmap_mtop(pt[k] & PG_FRAME);
  216                                         if (is_dumpable(pa))
  217                                                 dump_add_page(pa);
  218                                 }
  219                         }
  220                 } else {
  221                         /* nothing, we're going to dump a null page */
  222                 }
  223         }
  224 
  225         /* Calculate dump size. */
  226         dumpsize = ptesize;
  227         dumpsize += round_page(msgbufp->msg_size);
  228         dumpsize += round_page(vm_page_dump_size);
  229         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  230                 bits = vm_page_dump[i];
  231                 while (bits) {
  232                         bit = bsfl(bits);
  233                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) + bit) * PAGE_SIZE;
  234                         /* Clear out undumpable pages now if needed */
  235                         if (is_dumpable(pa)) {
  236                                 dumpsize += PAGE_SIZE;
  237                         } else {
  238                                 dump_drop_page(pa);
  239                         }
  240                         bits &= ~(1ul << bit);
  241                 }
  242         }
  243         dumpsize += PAGE_SIZE;
  244 
  245         /* Determine dump offset on device. */
  246         if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
  247                 error = ENOSPC;
  248                 goto fail;
  249         }
  250         dumplo = di->mediaoffset + di->mediasize - dumpsize;
  251         dumplo -= sizeof(kdh) * 2;
  252         progress = dumpsize;
  253 
  254         /* Initialize mdhdr */
  255         bzero(&mdhdr, sizeof(mdhdr));
  256         strcpy(mdhdr.magic, MINIDUMP_MAGIC);
  257         mdhdr.version = MINIDUMP_VERSION;
  258         mdhdr.msgbufsize = msgbufp->msg_size;
  259         mdhdr.bitmapsize = vm_page_dump_size;
  260         mdhdr.ptesize = ptesize;
  261         mdhdr.kernbase = KERNBASE;
  262 #ifdef PAE
  263         mdhdr.paemode = 1;
  264 #endif
  265 
  266         mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_I386_VERSION, dumpsize, di->blocksize);
  267 
  268         printf("Physical memory: %ju MB\n", ptoa((uintmax_t)physmem) / 1048576);
  269         printf("Dumping %llu MB:", (long long)dumpsize >> 20);
  270 
  271         /* Dump leader */
  272         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  273         if (error)
  274                 goto fail;
  275         dumplo += sizeof(kdh);
  276 
  277         /* Dump my header */
  278         bzero(&fakept, sizeof(fakept));
  279         bcopy(&mdhdr, &fakept, sizeof(mdhdr));
  280         error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
  281         if (error)
  282                 goto fail;
  283 
  284         /* Dump msgbuf up front */
  285         error = blk_write(di, (char *)msgbufp->msg_ptr, 0, round_page(msgbufp->msg_size));
  286         if (error)
  287                 goto fail;
  288 
  289         /* Dump bitmap */
  290         error = blk_write(di, (char *)vm_page_dump, 0, round_page(vm_page_dump_size));
  291         if (error)
  292                 goto fail;
  293 
  294         /* Dump kernel page table pages */
  295         for (va = KERNBASE; va < kernel_vm_end; va += NBPDR) {
  296                 /* We always write a page, even if it is zero */
  297                 pd = (pd_entry_t *)((uintptr_t)IdlePTD + KERNBASE);     /* always mapped! */
  298                 j = va >> PDRSHIFT;
  299                 if ((pd[j] & (PG_PS | PG_V)) == (PG_PS | PG_V))  {
  300                         /* This is a single 2M block. Generate a fake PTP */
  301                         pa = pd[j] & PG_PS_FRAME;
  302                         for (k = 0; k < NPTEPG; k++) {
  303                                 fakept[k] = (pa + (k * PAGE_SIZE)) | PG_V | PG_RW | PG_A | PG_M;
  304                         }
  305                         error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
  306                         if (error)
  307                                 goto fail;
  308                         /* flush, in case we reuse fakept in the same block */
  309                         error = blk_flush(di);
  310                         if (error)
  311                                 goto fail;
  312                         continue;
  313                 }
  314                 if ((pd[j] & PG_V) == PG_V) {
  315                         pa = xpmap_mtop(pd[j] & PG_FRAME);
  316 #ifndef XEN
  317                         error = blk_write(di, 0, pa, PAGE_SIZE);
  318 #else
  319                         pt = pmap_kenter_temporary(pa, 0);
  320                         memcpy(fakept, pt, PAGE_SIZE);
  321                         for (i = 0; i < NPTEPG; i++) 
  322                                 fakept[i] = xpmap_mtop(fakept[i]);
  323                         error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
  324                         if (error)
  325                                 goto fail;
  326                         /* flush, in case we reuse fakept in the same block */
  327                         error = blk_flush(di);
  328                         if (error)
  329                                 goto fail;
  330                         bzero(fakept, sizeof(fakept));
  331 #endif                  
  332                         
  333                         if (error)
  334                                 goto fail;
  335                 } else {
  336                         bzero(fakept, sizeof(fakept));
  337                         error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
  338                         if (error)
  339                                 goto fail;
  340                         /* flush, in case we reuse fakept in the same block */
  341                         error = blk_flush(di);
  342                         if (error)
  343                                 goto fail;
  344                 }
  345         }
  346 
  347         /* Dump memory chunks */
  348         /* XXX cluster it up and use blk_dump() */
  349         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  350                 bits = vm_page_dump[i];
  351                 while (bits) {
  352                         bit = bsfl(bits);
  353                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) + bit) * PAGE_SIZE;
  354                         error = blk_write(di, 0, pa, PAGE_SIZE);
  355                         if (error)
  356                                 goto fail;
  357                         bits &= ~(1ul << bit);
  358                 }
  359         }
  360 
  361         error = blk_flush(di);
  362         if (error)
  363                 goto fail;
  364 
  365         /* Dump trailer */
  366         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  367         if (error)
  368                 goto fail;
  369         dumplo += sizeof(kdh);
  370 
  371         /* Signal completion, signoff and exit stage left. */
  372         dump_write(di, NULL, 0, 0, 0);
  373         printf("\nDump complete\n");
  374         return;
  375 
  376  fail:
  377         if (error < 0)
  378                 error = -error;
  379 
  380         if (error == ECANCELED)
  381                 printf("\nDump aborted\n");
  382         else if (error == ENOSPC)
  383                 printf("\nDump failed. Partition too small.\n");
  384         else
  385                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  386 }
  387 
  388 void
  389 dump_add_page(vm_paddr_t pa)
  390 {
  391         int idx, bit;
  392 
  393         pa >>= PAGE_SHIFT;
  394         idx = pa >> 5;          /* 2^5 = 32 */
  395         bit = pa & 31;
  396         atomic_set_int(&vm_page_dump[idx], 1ul << bit);
  397 }
  398 
  399 void
  400 dump_drop_page(vm_paddr_t pa)
  401 {
  402         int idx, bit;
  403 
  404         pa >>= PAGE_SHIFT;
  405         idx = pa >> 5;          /* 2^5 = 32 */
  406         bit = pa & 31;
  407         atomic_clear_int(&vm_page_dump[idx], 1ul << bit);
  408 }
  409
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FreeBSD/Linux Kernel Cross Reference sys/i386/i386/minidump_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/minidump_machdep.c
