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/amd64/amd64/minidump_machdep.c 215872 2010-11-26 16:09:08Z avg $");
   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 extern uint64_t KPDPphys;
   57 
   58 uint64_t *vm_page_dump;
   59 int vm_page_dump_size;
   60 
   61 static struct kerneldumpheader kdh;
   62 static off_t dumplo;
   63 
   64 /* Handle chunked writes. */
   65 static size_t fragsz;
   66 static void *dump_va;
   67 static size_t counter, progress;
   68 
   69 CTASSERT(sizeof(*vm_page_dump) == 8);
   70 
   71 static int
   72 is_dumpable(vm_paddr_t pa)
   73 {
   74         int i;
   75 
   76         for (i = 0; dump_avail[i] != 0 || dump_avail[i + 1] != 0; i += 2) {
   77                 if (pa >= dump_avail[i] && pa < dump_avail[i + 1])
   78                         return (1);
   79         }
   80         return (0);
   81 }
   82 
   83 #define PG2MB(pgs) (((pgs) + (1 << 8) - 1) >> 8)
   84 
   85 static int
   86 blk_flush(struct dumperinfo *di)
   87 {
   88         int error;
   89 
   90         if (fragsz == 0)
   91                 return (0);
   92 
   93         error = dump_write(di, dump_va, 0, dumplo, fragsz);
   94         dumplo += fragsz;
   95         fragsz = 0;
   96         return (error);
   97 }
   98 
   99 static int
  100 blk_write(struct dumperinfo *di, char *ptr, vm_paddr_t pa, size_t sz)
  101 {
  102         size_t len;
  103         int error, i, c;
  104         u_int maxdumpsz;
  105 
  106         maxdumpsz = min(di->maxiosize, MAXDUMPPGS * PAGE_SIZE);
  107         if (maxdumpsz == 0)     /* seatbelt */
  108                 maxdumpsz = PAGE_SIZE;
  109         error = 0;
  110         if ((sz % PAGE_SIZE) != 0) {
  111                 printf("size not page aligned\n");
  112                 return (EINVAL);
  113         }
  114         if (ptr != NULL && pa != 0) {
  115                 printf("cant have both va and pa!\n");
  116                 return (EINVAL);
  117         }
  118         if (pa != 0 && (((uintptr_t)ptr) % PAGE_SIZE) != 0) {
  119                 printf("address not page aligned\n");
  120                 return (EINVAL);
  121         }
  122         if (ptr != NULL) {
  123                 /* If we're doing a virtual dump, flush any pre-existing pa pages */
  124                 error = blk_flush(di);
  125                 if (error)
  126                         return (error);
  127         }
  128         while (sz) {
  129                 len = maxdumpsz - fragsz;
  130                 if (len > sz)
  131                         len = sz;
  132                 counter += len;
  133                 progress -= len;
  134                 if (counter >> 24) {
  135                         printf(" %ld", PG2MB(progress >> PAGE_SHIFT));
  136                         counter &= (1<<24) - 1;
  137                 }
  138                 if (ptr) {
  139                         error = dump_write(di, ptr, 0, dumplo, len);
  140                         if (error)
  141                                 return (error);
  142                         dumplo += len;
  143                         ptr += len;
  144                         sz -= len;
  145                 } else {
  146                         for (i = 0; i < len; i += PAGE_SIZE)
  147                                 dump_va = pmap_kenter_temporary(pa + i, (i + fragsz) >> PAGE_SHIFT);
  148                         fragsz += len;
  149                         pa += len;
  150                         sz -= len;
  151                         if (fragsz == maxdumpsz) {
  152                                 error = blk_flush(di);
  153                                 if (error)
  154                                         return (error);
  155                         }
  156                 }
  157 
  158                 /* Check for user abort. */
  159                 c = cncheckc();
  160                 if (c == 0x03)
  161                         return (ECANCELED);
  162                 if (c != -1)
  163                         printf(" (CTRL-C to abort) ");
  164         }
  165 
  166         return (0);
  167 }
  168 
  169 /* A fake page table page, to avoid having to handle both 4K and 2M pages */
  170 static pd_entry_t fakepd[NPDEPG];
  171 
  172 void
  173 minidumpsys(struct dumperinfo *di)
  174 {
  175         uint64_t dumpsize;
  176         uint32_t pmapsize;
  177         vm_offset_t va;
  178         int error;
  179         uint64_t bits;
  180         uint64_t *pdp, *pd, *pt, pa;
  181         int i, j, k, n, bit;
  182         int retry_count;
  183         struct minidumphdr mdhdr;
  184 
  185         retry_count = 0;
  186  retry:
  187         retry_count++;
  188         counter = 0;
  189         /* Walk page table pages, set bits in vm_page_dump */
  190         pmapsize = 0;
  191         pdp = (uint64_t *)PHYS_TO_DMAP(KPDPphys);
  192         for (va = VM_MIN_KERNEL_ADDRESS; va < MAX(KERNBASE + NKPT * NBPDR,
  193             kernel_vm_end); ) {
  194                 /*
  195                  * We always write a page, even if it is zero. Each
  196                  * page written corresponds to 1GB of space
  197                  */
  198                 pmapsize += PAGE_SIZE;
  199                 i = (va >> PDPSHIFT) & ((1ul << NPDPEPGSHIFT) - 1);
  200                 if ((pdp[i] & PG_V) == 0) {
  201                         va += NBPDP;
  202                         continue;
  203                 }
  204 
  205                 /*
  206                  * 1GB page is represented as 512 2MB pages in a dump.
  207                  */
  208                 if ((pdp[i] & PG_PS) != 0) {
  209                         va += NBPDP;
  210                         pa = pdp[i] & PG_PS_FRAME;
  211                         for (n = 0; n < NPDEPG * NPTEPG; n++) {
  212                                 if (is_dumpable(pa))
  213                                         dump_add_page(pa);
  214                                 pa += PAGE_SIZE;
  215                         }
  216                         continue;
  217                 }
  218 
  219                 pd = (uint64_t *)PHYS_TO_DMAP(pdp[i] & PG_FRAME);
  220                 for (n = 0; n < NPDEPG; n++, va += NBPDR) {
  221                         j = (va >> PDRSHIFT) & ((1ul << NPDEPGSHIFT) - 1);
  222 
  223                         if ((pd[j] & PG_V) == 0)
  224                                 continue;
  225 
  226                         if ((pd[j] & PG_PS) != 0) {
  227                                 /* This is an entire 2M page. */
  228                                 pa = pd[j] & PG_PS_FRAME;
  229                                 for (k = 0; k < NPTEPG; k++) {
  230                                         if (is_dumpable(pa))
  231                                                 dump_add_page(pa);
  232                                         pa += PAGE_SIZE;
  233                                 }
  234                                 continue;
  235                         }
  236 
  237                         pa = pd[j] & PG_FRAME;
  238                         /* set bit for this PTE page */
  239                         if (is_dumpable(pa))
  240                                 dump_add_page(pa);
  241                         /* and for each valid page in this 2MB block */
  242                         pt = (uint64_t *)PHYS_TO_DMAP(pd[j] & PG_FRAME);
  243                         for (k = 0; k < NPTEPG; k++) {
  244                                 if ((pt[k] & PG_V) == 0)
  245                                         continue;
  246                                 pa = pt[k] & PG_FRAME;
  247                                 if (is_dumpable(pa))
  248                                         dump_add_page(pa);
  249                         }
  250                 }
  251         }
  252 
  253         /* Calculate dump size. */
  254         dumpsize = pmapsize;
  255         dumpsize += round_page(msgbufp->msg_size);
  256         dumpsize += round_page(vm_page_dump_size);
  257         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  258                 bits = vm_page_dump[i];
  259                 while (bits) {
  260                         bit = bsfq(bits);
  261                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) + bit) * PAGE_SIZE;
  262                         /* Clear out undumpable pages now if needed */
  263                         if (is_dumpable(pa)) {
  264                                 dumpsize += PAGE_SIZE;
  265                         } else {
  266                                 dump_drop_page(pa);
  267                         }
  268                         bits &= ~(1ul << bit);
  269                 }
  270         }
  271         dumpsize += PAGE_SIZE;
  272 
  273         /* Determine dump offset on device. */
  274         if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
  275                 error = E2BIG;
  276                 goto fail;
  277         }
  278         dumplo = di->mediaoffset + di->mediasize - dumpsize;
  279         dumplo -= sizeof(kdh) * 2;
  280         progress = dumpsize;
  281 
  282         /* Initialize mdhdr */
  283         bzero(&mdhdr, sizeof(mdhdr));
  284         strcpy(mdhdr.magic, MINIDUMP_MAGIC);
  285         mdhdr.version = MINIDUMP_VERSION;
  286         mdhdr.msgbufsize = msgbufp->msg_size;
  287         mdhdr.bitmapsize = vm_page_dump_size;
  288         mdhdr.pmapsize = pmapsize;
  289         mdhdr.kernbase = VM_MIN_KERNEL_ADDRESS;
  290         mdhdr.dmapbase = DMAP_MIN_ADDRESS;
  291         mdhdr.dmapend = DMAP_MAX_ADDRESS;
  292 
  293         mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_AMD64_VERSION, dumpsize, di->blocksize);
  294 
  295         printf("Physical memory: %ju MB\n", ptoa((uintmax_t)physmem) / 1048576);
  296         printf("Dumping %llu MB:", (long long)dumpsize >> 20);
  297 
  298         /* Dump leader */
  299         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  300         if (error)
  301                 goto fail;
  302         dumplo += sizeof(kdh);
  303 
  304         /* Dump my header */
  305         bzero(&fakepd, sizeof(fakepd));
  306         bcopy(&mdhdr, &fakepd, sizeof(mdhdr));
  307         error = blk_write(di, (char *)&fakepd, 0, PAGE_SIZE);
  308         if (error)
  309                 goto fail;
  310 
  311         /* Dump msgbuf up front */
  312         error = blk_write(di, (char *)msgbufp->msg_ptr, 0, round_page(msgbufp->msg_size));
  313         if (error)
  314                 goto fail;
  315 
  316         /* Dump bitmap */
  317         error = blk_write(di, (char *)vm_page_dump, 0, round_page(vm_page_dump_size));
  318         if (error)
  319                 goto fail;
  320 
  321         /* Dump kernel page directory pages */
  322         bzero(fakepd, sizeof(fakepd));
  323         pdp = (uint64_t *)PHYS_TO_DMAP(KPDPphys);
  324         for (va = VM_MIN_KERNEL_ADDRESS; va < MAX(KERNBASE + NKPT * NBPDR,
  325             kernel_vm_end); va += NBPDP) {
  326                 i = (va >> PDPSHIFT) & ((1ul << NPDPEPGSHIFT) - 1);
  327 
  328                 /* We always write a page, even if it is zero */
  329                 if ((pdp[i] & PG_V) == 0) {
  330                         error = blk_write(di, (char *)&fakepd, 0, PAGE_SIZE);
  331                         if (error)
  332                                 goto fail;
  333                         /* flush, in case we reuse fakepd in the same block */
  334                         error = blk_flush(di);
  335                         if (error)
  336                                 goto fail;
  337                         continue;
  338                 }
  339 
  340                 /* 1GB page is represented as 512 2MB pages in a dump */
  341                 if ((pdp[i] & PG_PS) != 0) {
  342                         /* PDPE and PDP have identical layout in this case */
  343                         fakepd[0] = pdp[i];
  344                         for (j = 1; j < NPDEPG; j++)
  345                                 fakepd[j] = fakepd[j - 1] + NBPDR;
  346                         error = blk_write(di, (char *)&fakepd, 0, PAGE_SIZE);
  347                         if (error)
  348                                 goto fail;
  349                         /* flush, in case we reuse fakepd in the same block */
  350                         error = blk_flush(di);
  351                         if (error)
  352                                 goto fail;
  353                         bzero(fakepd, sizeof(fakepd));
  354                         continue;
  355                 }
  356 
  357                 pd = (uint64_t *)PHYS_TO_DMAP(pdp[i] & PG_FRAME);
  358                 error = blk_write(di, (char *)pd, 0, PAGE_SIZE);
  359                 if (error)
  360                         goto fail;
  361                 error = blk_flush(di);
  362                 if (error)
  363                         goto fail;
  364         }
  365 
  366         /* Dump memory chunks */
  367         /* XXX cluster it up and use blk_dump() */
  368         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  369                 bits = vm_page_dump[i];
  370                 while (bits) {
  371                         bit = bsfq(bits);
  372                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) + bit) * PAGE_SIZE;
  373                         error = blk_write(di, 0, pa, PAGE_SIZE);
  374                         if (error)
  375                                 goto fail;
  376                         bits &= ~(1ul << bit);
  377                 }
  378         }
  379 
  380         error = blk_flush(di);
  381         if (error)
  382                 goto fail;
  383 
  384         /* Dump trailer */
  385         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  386         if (error)
  387                 goto fail;
  388         dumplo += sizeof(kdh);
  389 
  390         /* Signal completion, signoff and exit stage left. */
  391         dump_write(di, NULL, 0, 0, 0);
  392         printf("\nDump complete\n");
  393         return;
  394 
  395  fail:
  396         if (error < 0)
  397                 error = -error;
  398 
  399         printf("\n");
  400         if (error == ENOSPC) {
  401                 printf("Dump map grown while dumping. ");
  402                 if (retry_count < 5) {
  403                         printf("Retrying...\n");
  404                         goto retry;
  405                 }
  406                 printf("Dump failed.\n");
  407         }
  408         else if (error == ECANCELED)
  409                 printf("Dump aborted\n");
  410         else if (error == E2BIG)
  411                 printf("Dump failed. Partition too small.\n");
  412         else
  413                 printf("** DUMP FAILED (ERROR %d) **\n", error);
  414 }
  415 
  416 void
  417 dump_add_page(vm_paddr_t pa)
  418 {
  419         int idx, bit;
  420 
  421         pa >>= PAGE_SHIFT;
  422         idx = pa >> 6;          /* 2^6 = 64 */
  423         bit = pa & 63;
  424         atomic_set_long(&vm_page_dump[idx], 1ul << bit);
  425 }
  426 
  427 void
  428 dump_drop_page(vm_paddr_t pa)
  429 {
  430         int idx, bit;
  431 
  432         pa >>= PAGE_SHIFT;
  433         idx = pa >> 6;          /* 2^6 = 64 */
  434         bit = pa & 63;
  435         atomic_clear_long(&vm_page_dump[idx], 1ul << bit);
  436 }
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FreeBSD/Linux Kernel Cross Reference sys/amd64/amd64/minidump_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/minidump_machdep.c
