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/8.0/sys/amd64/amd64/minidump_machdep.c 193066 2009-05-29 21:27:12Z jamie $");
   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 pt_entry_t fakept[NPTEPG];
  171 
  172 void
  173 minidumpsys(struct dumperinfo *di)
  174 {
  175         uint64_t dumpsize;
  176         uint32_t ptesize;
  177         vm_offset_t va;
  178         int error;
  179         uint64_t bits;
  180         uint64_t *pdp, *pd, *pt, pa;
  181         int i, j, k, bit;
  182         struct minidumphdr mdhdr;
  183 
  184         counter = 0;
  185         /* Walk page table pages, set bits in vm_page_dump */
  186         ptesize = 0;
  187         pdp = (uint64_t *)PHYS_TO_DMAP(KPDPphys);
  188         for (va = VM_MIN_KERNEL_ADDRESS; va < MAX(KERNBASE + NKPT * NBPDR,
  189             kernel_vm_end); va += NBPDR) {
  190                 i = (va >> PDPSHIFT) & ((1ul << NPDPEPGSHIFT) - 1);
  191                 /*
  192                  * We always write a page, even if it is zero. Each
  193                  * page written corresponds to 2MB of space
  194                  */
  195                 ptesize += PAGE_SIZE;
  196                 if ((pdp[i] & PG_V) == 0)
  197                         continue;
  198                 pd = (uint64_t *)PHYS_TO_DMAP(pdp[i] & PG_FRAME);
  199                 j = ((va >> PDRSHIFT) & ((1ul << NPDEPGSHIFT) - 1));
  200                 if ((pd[j] & (PG_PS | PG_V)) == (PG_PS | PG_V))  {
  201                         /* This is an entire 2M page. */
  202                         pa = 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 = (uint64_t *)PHYS_TO_DMAP(pd[j] & PG_FRAME);
  213                         for (k = 0; k < NPTEPG; k++) {
  214                                 if ((pt[k] & PG_V) == PG_V) {
  215                                         pa = 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 = bsfq(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 = VM_MIN_KERNEL_ADDRESS;
  262         mdhdr.dmapbase = DMAP_MIN_ADDRESS;
  263         mdhdr.dmapend = DMAP_MAX_ADDRESS;
  264 
  265         mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_AMD64_VERSION, dumpsize, di->blocksize);
  266 
  267         printf("Physical memory: %ju MB\n", ptoa((uintmax_t)physmem) / 1048576);
  268         printf("Dumping %llu MB:", (long long)dumpsize >> 20);
  269 
  270         /* Dump leader */
  271         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  272         if (error)
  273                 goto fail;
  274         dumplo += sizeof(kdh);
  275 
  276         /* Dump my header */
  277         bzero(&fakept, sizeof(fakept));
  278         bcopy(&mdhdr, &fakept, sizeof(mdhdr));
  279         error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
  280         if (error)
  281                 goto fail;
  282 
  283         /* Dump msgbuf up front */
  284         error = blk_write(di, (char *)msgbufp->msg_ptr, 0, round_page(msgbufp->msg_size));
  285         if (error)
  286                 goto fail;
  287 
  288         /* Dump bitmap */
  289         error = blk_write(di, (char *)vm_page_dump, 0, round_page(vm_page_dump_size));
  290         if (error)
  291                 goto fail;
  292 
  293         /* Dump kernel page table pages */
  294         pdp = (uint64_t *)PHYS_TO_DMAP(KPDPphys);
  295         for (va = VM_MIN_KERNEL_ADDRESS; va < MAX(KERNBASE + NKPT * NBPDR,
  296             kernel_vm_end); va += NBPDR) {
  297                 i = (va >> PDPSHIFT) & ((1ul << NPDPEPGSHIFT) - 1);
  298                 /* We always write a page, even if it is zero */
  299                 if ((pdp[i] & PG_V) == 0) {
  300                         bzero(fakept, sizeof(fakept));
  301                         error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
  302                         if (error)
  303                                 goto fail;
  304                         /* flush, in case we reuse fakept in the same block */
  305                         error = blk_flush(di);
  306                         if (error)
  307                                 goto fail;
  308                         continue;
  309                 }
  310                 pd = (uint64_t *)PHYS_TO_DMAP(pdp[i] & PG_FRAME);
  311                 j = ((va >> PDRSHIFT) & ((1ul << NPDEPGSHIFT) - 1));
  312                 if ((pd[j] & (PG_PS | PG_V)) == (PG_PS | PG_V))  {
  313                         /* This is a single 2M block. Generate a fake PTP */
  314                         pa = pd[j] & PG_PS_FRAME;
  315                         for (k = 0; k < NPTEPG; k++) {
  316                                 fakept[k] = (pa + (k * PAGE_SIZE)) | PG_V | PG_RW | PG_A | PG_M;
  317                         }
  318                         error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
  319                         if (error)
  320                                 goto fail;
  321                         /* flush, in case we reuse fakept in the same block */
  322                         error = blk_flush(di);
  323                         if (error)
  324                                 goto fail;
  325                         continue;
  326                 }
  327                 if ((pd[j] & PG_V) == PG_V) {
  328                         pt = (uint64_t *)PHYS_TO_DMAP(pd[j] & PG_FRAME);
  329                         error = blk_write(di, (char *)pt, 0, PAGE_SIZE);
  330                         if (error)
  331                                 goto fail;
  332                 } else {
  333                         bzero(fakept, sizeof(fakept));
  334                         error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
  335                         if (error)
  336                                 goto fail;
  337                         /* flush, in case we reuse fakept in the same block */
  338                         error = blk_flush(di);
  339                         if (error)
  340                                 goto fail;
  341                 }
  342         }
  343 
  344         /* Dump memory chunks */
  345         /* XXX cluster it up and use blk_dump() */
  346         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  347                 bits = vm_page_dump[i];
  348                 while (bits) {
  349                         bit = bsfq(bits);
  350                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) + bit) * PAGE_SIZE;
  351                         error = blk_write(di, 0, pa, PAGE_SIZE);
  352                         if (error)
  353                                 goto fail;
  354                         bits &= ~(1ul << bit);
  355                 }
  356         }
  357 
  358         error = blk_flush(di);
  359         if (error)
  360                 goto fail;
  361 
  362         /* Dump trailer */
  363         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  364         if (error)
  365                 goto fail;
  366         dumplo += sizeof(kdh);
  367 
  368         /* Signal completion, signoff and exit stage left. */
  369         dump_write(di, NULL, 0, 0, 0);
  370         printf("\nDump complete\n");
  371         return;
  372 
  373  fail:
  374         if (error < 0)
  375                 error = -error;
  376 
  377         if (error == ECANCELED)
  378                 printf("\nDump aborted\n");
  379         else if (error == ENOSPC)
  380                 printf("\nDump failed. Partition too small.\n");
  381         else
  382                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  383 }
  384 
  385 void
  386 dump_add_page(vm_paddr_t pa)
  387 {
  388         int idx, bit;
  389 
  390         pa >>= PAGE_SHIFT;
  391         idx = pa >> 6;          /* 2^6 = 64 */
  392         bit = pa & 63;
  393         atomic_set_long(&vm_page_dump[idx], 1ul << bit);
  394 }
  395 
  396 void
  397 dump_drop_page(vm_paddr_t pa)
  398 {
  399         int idx, bit;
  400 
  401         pa >>= PAGE_SHIFT;
  402         idx = pa >> 6;          /* 2^6 = 64 */
  403         bit = pa & 63;
  404         atomic_clear_long(&vm_page_dump[idx], 1ul << bit);
  405 }
Cache object: 9a047ca4cbc5f742290b5fbac582a525
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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
