The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/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("$FreeBSD$");
   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 /* XXX should be MI */
   84 static void
   85 mkdumpheader(struct kerneldumpheader *kdh, uint32_t archver, uint64_t dumplen,
   86     uint32_t blksz)
   87 {
   88 
   89         bzero(kdh, sizeof(*kdh));
   90         strncpy(kdh->magic, KERNELDUMPMAGIC, sizeof(kdh->magic));
   91         strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
   92         kdh->version = htod32(KERNELDUMPVERSION);
   93         kdh->architectureversion = htod32(archver);
   94         kdh->dumplength = htod64(dumplen);
   95         kdh->dumptime = htod64(time_second);
   96         kdh->blocksize = htod32(blksz);
   97         strncpy(kdh->hostname, hostname, sizeof(kdh->hostname));
   98         strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
   99         if (panicstr != NULL)
  100                 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
  101         kdh->parity = kerneldump_parity(kdh);
  102 }
  103 
  104 #define PG2MB(pgs) (((pgs) + (1 << 8) - 1) >> 8)
  105 
  106 static int
  107 blk_flush(struct dumperinfo *di)
  108 {
  109         int error;
  110 
  111         if (fragsz == 0)
  112                 return (0);
  113 
  114         error = dump_write(di, dump_va, 0, dumplo, fragsz);
  115         dumplo += fragsz;
  116         fragsz = 0;
  117         return (error);
  118 }
  119 
  120 static int
  121 blk_write(struct dumperinfo *di, char *ptr, vm_paddr_t pa, size_t sz)
  122 {
  123         size_t len;
  124         int error, i, c;
  125 
  126         error = 0;
  127         if ((sz % PAGE_SIZE) != 0) {
  128                 printf("size not page aligned\n");
  129                 return (EINVAL);
  130         }
  131         if (ptr != NULL && pa != 0) {
  132                 printf("cant have both va and pa!\n");
  133                 return (EINVAL);
  134         }
  135         if (pa != 0 && (((uintptr_t)ptr) % PAGE_SIZE) != 0) {
  136                 printf("address not page aligned\n");
  137                 return (EINVAL);
  138         }
  139         if (ptr != NULL) {
  140                 /* If we're doing a virtual dump, flush any pre-existing pa pages */
  141                 error = blk_flush(di);
  142                 if (error)
  143                         return (error);
  144         }
  145         while (sz) {
  146                 len = (MAXDUMPPGS * PAGE_SIZE) - fragsz;
  147                 if (len > sz)
  148                         len = sz;
  149                 counter += len;
  150                 progress -= len;
  151                 if (counter >> 24) {
  152                         printf(" %ld", PG2MB(progress >> PAGE_SHIFT));
  153                         counter &= (1<<24) - 1;
  154                 }
  155                 if (ptr) {
  156                         error = dump_write(di, ptr, 0, dumplo, len);
  157                         if (error)
  158                                 return (error);
  159                         dumplo += len;
  160                         ptr += len;
  161                         sz -= len;
  162                 } else {
  163                         for (i = 0; i < len; i += PAGE_SIZE)
  164                                 dump_va = pmap_kenter_temporary(pa + i, (i + fragsz) >> PAGE_SHIFT);
  165                         fragsz += len;
  166                         pa += len;
  167                         sz -= len;
  168                         if (fragsz == (MAXDUMPPGS * PAGE_SIZE)) {
  169                                 error = blk_flush(di);
  170                                 if (error)
  171                                         return (error);
  172                         }
  173                 }
  174 
  175                 /* Check for user abort. */
  176                 c = cncheckc();
  177                 if (c == 0x03)
  178                         return (ECANCELED);
  179                 if (c != -1)
  180                         printf(" (CTRL-C to abort) ");
  181         }
  182 
  183         return (0);
  184 }
  185 
  186 /* A fake page table page, to avoid having to handle both 4K and 2M pages */
  187 static pt_entry_t fakept[NPTEPG];
  188 
  189 void
  190 minidumpsys(struct dumperinfo *di)
  191 {
  192         uint64_t dumpsize;
  193         uint32_t ptesize;
  194         vm_offset_t va;
  195         int error;
  196         uint64_t bits;
  197         uint64_t *pdp, *pd, *pt, pa;
  198         int i, j, k, bit;
  199         struct minidumphdr mdhdr;
  200 
  201         counter = 0;
  202         /* Walk page table pages, set bits in vm_page_dump */
  203         ptesize = 0;
  204         pdp = (uint64_t *)PHYS_TO_DMAP(KPDPphys);
  205         for (va = VM_MIN_KERNEL_ADDRESS; va < MAX(KERNBASE + NKPT * NBPDR,
  206             kernel_vm_end); va += NBPDR) {
  207                 i = (va >> PDPSHIFT) & ((1ul << NPDPEPGSHIFT) - 1);
  208                 /*
  209                  * We always write a page, even if it is zero. Each
  210                  * page written corresponds to 2MB of space
  211                  */
  212                 ptesize += PAGE_SIZE;
  213                 if ((pdp[i] & PG_V) == 0)
  214                         continue;
  215                 pd = (uint64_t *)PHYS_TO_DMAP(pdp[i] & PG_FRAME);
  216                 j = ((va >> PDRSHIFT) & ((1ul << NPDEPGSHIFT) - 1));
  217                 if ((pd[j] & (PG_PS | PG_V)) == (PG_PS | PG_V))  {
  218                         /* This is an entire 2M page. */
  219                         pa = pd[j] & PG_PS_FRAME;
  220                         for (k = 0; k < NPTEPG; k++) {
  221                                 if (is_dumpable(pa))
  222                                         dump_add_page(pa);
  223                                 pa += PAGE_SIZE;
  224                         }
  225                         continue;
  226                 }
  227                 if ((pd[j] & PG_V) == PG_V) {
  228                         /* set bit for each valid page in this 2MB block */
  229                         pt = (uint64_t *)PHYS_TO_DMAP(pd[j] & PG_FRAME);
  230                         for (k = 0; k < NPTEPG; k++) {
  231                                 if ((pt[k] & PG_V) == PG_V) {
  232                                         pa = pt[k] & PG_FRAME;
  233                                         if (is_dumpable(pa))
  234                                                 dump_add_page(pa);
  235                                 }
  236                         }
  237                 } else {
  238                         /* nothing, we're going to dump a null page */
  239                 }
  240         }
  241 
  242         /* Calculate dump size. */
  243         dumpsize = ptesize;
  244         dumpsize += round_page(msgbufp->msg_size);
  245         dumpsize += round_page(vm_page_dump_size);
  246         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  247                 bits = vm_page_dump[i];
  248                 while (bits) {
  249                         bit = bsfq(bits);
  250                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) + bit) * PAGE_SIZE;
  251                         /* Clear out undumpable pages now if needed */
  252                         if (is_dumpable(pa)) {
  253                                 dumpsize += PAGE_SIZE;
  254                         } else {
  255                                 dump_drop_page(pa);
  256                         }
  257                         bits &= ~(1ul << bit);
  258                 }
  259         }
  260         dumpsize += PAGE_SIZE;
  261 
  262         /* Determine dump offset on device. */
  263         if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
  264                 error = ENOSPC;
  265                 goto fail;
  266         }
  267         dumplo = di->mediaoffset + di->mediasize - dumpsize;
  268         dumplo -= sizeof(kdh) * 2;
  269         progress = dumpsize;
  270 
  271         /* Initialize mdhdr */
  272         bzero(&mdhdr, sizeof(mdhdr));
  273         strcpy(mdhdr.magic, MINIDUMP_MAGIC);
  274         mdhdr.version = MINIDUMP_VERSION;
  275         mdhdr.msgbufsize = msgbufp->msg_size;
  276         mdhdr.bitmapsize = vm_page_dump_size;
  277         mdhdr.ptesize = ptesize;
  278         mdhdr.kernbase = VM_MIN_KERNEL_ADDRESS;
  279         mdhdr.dmapbase = DMAP_MIN_ADDRESS;
  280         mdhdr.dmapend = DMAP_MAX_ADDRESS;
  281 
  282         mkdumpheader(&kdh, KERNELDUMP_AMD64_VERSION, dumpsize, di->blocksize);
  283 
  284         printf("Physical memory: %ju MB\n", ptoa((uintmax_t)physmem) / 1048576);
  285         printf("Dumping %llu MB:", (long long)dumpsize >> 20);
  286 
  287         /* Dump leader */
  288         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  289         if (error)
  290                 goto fail;
  291         dumplo += sizeof(kdh);
  292 
  293         /* Dump my header */
  294         bzero(&fakept, sizeof(fakept));
  295         bcopy(&mdhdr, &fakept, sizeof(mdhdr));
  296         error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
  297         if (error)
  298                 goto fail;
  299 
  300         /* Dump msgbuf up front */
  301         error = blk_write(di, (char *)msgbufp->msg_ptr, 0, round_page(msgbufp->msg_size));
  302         if (error)
  303                 goto fail;
  304 
  305         /* Dump bitmap */
  306         error = blk_write(di, (char *)vm_page_dump, 0, round_page(vm_page_dump_size));
  307         if (error)
  308                 goto fail;
  309 
  310         /* Dump kernel page table pages */
  311         pdp = (uint64_t *)PHYS_TO_DMAP(KPDPphys);
  312         for (va = VM_MIN_KERNEL_ADDRESS; va < MAX(KERNBASE + NKPT * NBPDR,
  313             kernel_vm_end); va += NBPDR) {
  314                 i = (va >> PDPSHIFT) & ((1ul << NPDPEPGSHIFT) - 1);
  315                 /* We always write a page, even if it is zero */
  316                 if ((pdp[i] & PG_V) == 0) {
  317                         bzero(fakept, sizeof(fakept));
  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                 pd = (uint64_t *)PHYS_TO_DMAP(pdp[i] & PG_FRAME);
  328                 j = ((va >> PDRSHIFT) & ((1ul << NPDEPGSHIFT) - 1));
  329                 if ((pd[j] & (PG_PS | PG_V)) == (PG_PS | PG_V))  {
  330                         /* This is a single 2M block. Generate a fake PTP */
  331                         pa = pd[j] & PG_PS_FRAME;
  332                         for (k = 0; k < NPTEPG; k++) {
  333                                 fakept[k] = (pa + (k * PAGE_SIZE)) | PG_V | PG_RW | PG_A | PG_M;
  334                         }
  335                         error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
  336                         if (error)
  337                                 goto fail;
  338                         /* flush, in case we reuse fakept in the same block */
  339                         error = blk_flush(di);
  340                         if (error)
  341                                 goto fail;
  342                         continue;
  343                 }
  344                 if ((pd[j] & PG_V) == PG_V) {
  345                         pt = (uint64_t *)PHYS_TO_DMAP(pd[j] & PG_FRAME);
  346                         error = blk_write(di, (char *)pt, 0, PAGE_SIZE);
  347                         if (error)
  348                                 goto fail;
  349                 } else {
  350                         bzero(fakept, sizeof(fakept));
  351                         error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
  352                         if (error)
  353                                 goto fail;
  354                         /* flush, in case we reuse fakept in the same block */
  355                         error = blk_flush(di);
  356                         if (error)
  357                                 goto fail;
  358                 }
  359         }
  360 
  361         /* Dump memory chunks */
  362         /* XXX cluster it up and use blk_dump() */
  363         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  364                 bits = vm_page_dump[i];
  365                 while (bits) {
  366                         bit = bsfq(bits);
  367                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) + bit) * PAGE_SIZE;
  368                         error = blk_write(di, 0, pa, PAGE_SIZE);
  369                         if (error)
  370                                 goto fail;
  371                         bits &= ~(1ul << bit);
  372                 }
  373         }
  374 
  375         error = blk_flush(di);
  376         if (error)
  377                 goto fail;
  378 
  379         /* Dump trailer */
  380         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  381         if (error)
  382                 goto fail;
  383         dumplo += sizeof(kdh);
  384 
  385         /* Signal completion, signoff and exit stage left. */
  386         dump_write(di, NULL, 0, 0, 0);
  387         printf("\nDump complete\n");
  388         return;
  389 
  390  fail:
  391         if (error < 0)
  392                 error = -error;
  393 
  394         if (error == ECANCELED)
  395                 printf("\nDump aborted\n");
  396         else if (error == ENOSPC)
  397                 printf("\nDump failed. Partition too small.\n");
  398         else
  399                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  400 }
  401 
  402 void
  403 dump_add_page(vm_paddr_t pa)
  404 {
  405         int idx, bit;
  406 
  407         pa >>= PAGE_SHIFT;
  408         idx = pa >> 6;          /* 2^6 = 64 */
  409         bit = pa & 63;
  410         atomic_set_long(&vm_page_dump[idx], 1ul << bit);
  411 }
  412 
  413 void
  414 dump_drop_page(vm_paddr_t pa)
  415 {
  416         int idx, bit;
  417 
  418         pa >>= PAGE_SHIFT;
  419         idx = pa >> 6;          /* 2^6 = 64 */
  420         bit = pa & 63;
  421         atomic_clear_long(&vm_page_dump[idx], 1ul << bit);
  422 }

Cache object: b1e3f766b16f00a2fe04cc7101a605b7


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