minidump_machdep.c

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    1 /*-
    2  * Copyright (c) 2006 Peter Wemm
    3  * Copyright (c) 2015 The FreeBSD Foundation
    4  * All rights reserved.
    5  *
    6  * This software was developed by Andrew Turner under
    7  * sponsorship from the FreeBSD Foundation.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  *
   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  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/11.2/sys/arm64/arm64/minidump_machdep.c 331017 2018-03-15 19:08:33Z kevans $");
   34 
   35 #include "opt_watchdog.h"
   36 
   37 #include "opt_watchdog.h"
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/conf.h>
   42 #include <sys/cons.h>
   43 #include <sys/kernel.h>
   44 #include <sys/kerneldump.h>
   45 #include <sys/msgbuf.h>
   46 #include <sys/watchdog.h>
   47 #include <sys/vmmeter.h>
   48 
   49 #include <vm/vm.h>
   50 #include <vm/vm_param.h>
   51 #include <vm/vm_page.h>
   52 #include <vm/vm_phys.h>
   53 #include <vm/pmap.h>
   54 
   55 #include <machine/md_var.h>
   56 #include <machine/pte.h>
   57 #include <machine/minidump.h>
   58 
   59 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   60 
   61 /*
   62  * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
   63  * is to protect us from metadata and to protect metadata from us.
   64  */
   65 #define SIZEOF_METADATA         (64*1024)
   66 
   67 uint64_t *vm_page_dump;
   68 int vm_page_dump_size;
   69 
   70 static struct kerneldumpheader kdh;
   71 static off_t dumplo;
   72 
   73 /* Handle chunked writes. */
   74 static size_t fragsz;
   75 static void *dump_va;
   76 static size_t counter, progress, dumpsize;
   77 
   78 static uint64_t tmpbuffer[PAGE_SIZE / sizeof(uint64_t)];
   79 
   80 CTASSERT(sizeof(*vm_page_dump) == 8);
   81 
   82 static int
   83 is_dumpable(vm_paddr_t pa)
   84 {
   85         vm_page_t m;
   86         int i;
   87 
   88         if ((m = vm_phys_paddr_to_vm_page(pa)) != NULL)
   89                 return ((m->flags & PG_NODUMP) == 0);
   90         for (i = 0; dump_avail[i] != 0 || dump_avail[i + 1] != 0; i += 2) {
   91                 if (pa >= dump_avail[i] && pa < dump_avail[i + 1])
   92                         return (1);
   93         }
   94         return (0);
   95 }
   96 
   97 static int
   98 blk_flush(struct dumperinfo *di)
   99 {
  100         int error;
  101 
  102         if (fragsz == 0)
  103                 return (0);
  104 
  105         error = dump_write(di, dump_va, 0, dumplo, fragsz);
  106         dumplo += fragsz;
  107         fragsz = 0;
  108         return (error);
  109 }
  110 
  111 static struct {
  112         int min_per;
  113         int max_per;
  114         int visited;
  115 } progress_track[10] = {
  116         {  0,  10, 0},
  117         { 10,  20, 0},
  118         { 20,  30, 0},
  119         { 30,  40, 0},
  120         { 40,  50, 0},
  121         { 50,  60, 0},
  122         { 60,  70, 0},
  123         { 70,  80, 0},
  124         { 80,  90, 0},
  125         { 90, 100, 0}
  126 };
  127 
  128 static void
  129 report_progress(size_t progress, size_t dumpsize)
  130 {
  131         int sofar, i;
  132 
  133         sofar = 100 - ((progress * 100) / dumpsize);
  134         for (i = 0; i < nitems(progress_track); i++) {
  135                 if (sofar < progress_track[i].min_per ||
  136                     sofar > progress_track[i].max_per)
  137                         continue;
  138                 if (progress_track[i].visited)
  139                         return;
  140                 progress_track[i].visited = 1;
  141                 printf("..%d%%", sofar);
  142                 return;
  143         }
  144 }
  145 
  146 static int
  147 blk_write(struct dumperinfo *di, char *ptr, vm_paddr_t pa, size_t sz)
  148 {
  149         size_t len;
  150         int error, c;
  151         u_int maxdumpsz;
  152 
  153         maxdumpsz = min(di->maxiosize, MAXDUMPPGS * PAGE_SIZE);
  154         if (maxdumpsz == 0)     /* seatbelt */
  155                 maxdumpsz = PAGE_SIZE;
  156         error = 0;
  157         if ((sz % PAGE_SIZE) != 0) {
  158                 printf("size not page aligned\n");
  159                 return (EINVAL);
  160         }
  161         if (ptr != NULL && pa != 0) {
  162                 printf("cant have both va and pa!\n");
  163                 return (EINVAL);
  164         }
  165         if ((((uintptr_t)pa) % PAGE_SIZE) != 0) {
  166                 printf("address not page aligned %p\n", ptr);
  167                 return (EINVAL);
  168         }
  169         if (ptr != NULL) {
  170                 /*
  171                  * If we're doing a virtual dump, flush any
  172                  * pre-existing pa pages.
  173                  */
  174                 error = blk_flush(di);
  175                 if (error)
  176                         return (error);
  177         }
  178         while (sz) {
  179                 len = maxdumpsz - fragsz;
  180                 if (len > sz)
  181                         len = sz;
  182                 counter += len;
  183                 progress -= len;
  184                 if (counter >> 22) {
  185                         report_progress(progress, dumpsize);
  186                         counter &= (1 << 22) - 1;
  187                 }
  188 
  189                 wdog_kern_pat(WD_LASTVAL);
  190 
  191                 if (ptr) {
  192                         error = dump_write(di, ptr, 0, dumplo, len);
  193                         if (error)
  194                                 return (error);
  195                         dumplo += len;
  196                         ptr += len;
  197                         sz -= len;
  198                 } else {
  199                         dump_va = (void *)PHYS_TO_DMAP(pa);
  200                         fragsz += len;
  201                         pa += len;
  202                         sz -= len;
  203                         error = blk_flush(di);
  204                         if (error)
  205                                 return (error);
  206                 }
  207 
  208                 /* Check for user abort. */
  209                 c = cncheckc();
  210                 if (c == 0x03)
  211                         return (ECANCELED);
  212                 if (c != -1)
  213                         printf(" (CTRL-C to abort) ");
  214         }
  215 
  216         return (0);
  217 }
  218 
  219 int
  220 minidumpsys(struct dumperinfo *di)
  221 {
  222         pd_entry_t *l0, *l1, *l2;
  223         pt_entry_t *l3;
  224         uint32_t pmapsize;
  225         vm_offset_t va;
  226         vm_paddr_t pa;
  227         int error;
  228         uint64_t bits;
  229         int i, bit;
  230         int retry_count;
  231         struct minidumphdr mdhdr;
  232 
  233         retry_count = 0;
  234  retry:
  235         retry_count++;
  236         error = 0;
  237         pmapsize = 0;
  238         for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += L2_SIZE) {
  239                 pmapsize += PAGE_SIZE;
  240                 if (!pmap_get_tables(pmap_kernel(), va, &l0, &l1, &l2, &l3))
  241                         continue;
  242 
  243                 /* We should always be using the l2 table for kvm */
  244                 if (l2 == NULL)
  245                         continue;
  246 
  247                 if ((*l2 & ATTR_DESCR_MASK) == L2_BLOCK) {
  248                         pa = *l2 & ~ATTR_MASK;
  249                         for (i = 0; i < Ln_ENTRIES; i++, pa += PAGE_SIZE) {
  250                                 if (is_dumpable(pa))
  251                                         dump_add_page(pa);
  252                         }
  253                 } else if ((*l2 & ATTR_DESCR_MASK) == L2_TABLE) {
  254                         for (i = 0; i < Ln_ENTRIES; i++) {
  255                                 if ((l3[i] & ATTR_DESCR_MASK) != L3_PAGE)
  256                                         continue;
  257                                 pa = l3[i] & ~ATTR_MASK;
  258                                 if (is_dumpable(pa))
  259                                         dump_add_page(pa);
  260                         }
  261                 }
  262         }
  263 
  264         /* Calculate dump size. */
  265         dumpsize = pmapsize;
  266         dumpsize += round_page(msgbufp->msg_size);
  267         dumpsize += round_page(vm_page_dump_size);
  268         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  269                 bits = vm_page_dump[i];
  270                 while (bits) {
  271                         bit = ffsl(bits) - 1;
  272                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
  273                             bit) * PAGE_SIZE;
  274                         /* Clear out undumpable pages now if needed */
  275                         if (is_dumpable(pa))
  276                                 dumpsize += PAGE_SIZE;
  277                         else
  278                                 dump_drop_page(pa);
  279                         bits &= ~(1ul << bit);
  280                 }
  281         }
  282         dumpsize += PAGE_SIZE;
  283 
  284         /* Determine dump offset on device. */
  285         if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
  286                 error = E2BIG;
  287                 goto fail;
  288         }
  289         dumplo = di->mediaoffset + di->mediasize - dumpsize;
  290         dumplo -= sizeof(kdh) * 2;
  291         progress = dumpsize;
  292 
  293         /* Initialize mdhdr */
  294         bzero(&mdhdr, sizeof(mdhdr));
  295         strcpy(mdhdr.magic, MINIDUMP_MAGIC);
  296         mdhdr.version = MINIDUMP_VERSION;
  297         mdhdr.msgbufsize = msgbufp->msg_size;
  298         mdhdr.bitmapsize = vm_page_dump_size;
  299         mdhdr.pmapsize = pmapsize;
  300         mdhdr.kernbase = VM_MIN_KERNEL_ADDRESS;
  301         mdhdr.dmapphys = DMAP_MIN_PHYSADDR;
  302         mdhdr.dmapbase = DMAP_MIN_ADDRESS;
  303         mdhdr.dmapend = DMAP_MAX_ADDRESS;
  304 
  305         mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_AARCH64_VERSION,
  306             dumpsize, di->blocksize);
  307 
  308         printf("Dumping %llu out of %ju MB:", (long long)dumpsize >> 20,
  309             ptoa((uintmax_t)physmem) / 1048576);
  310 
  311         /* Dump leader */
  312         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  313         if (error)
  314                 goto fail;
  315         dumplo += sizeof(kdh);
  316 
  317         /* Dump my header */
  318         bzero(&tmpbuffer, sizeof(tmpbuffer));
  319         bcopy(&mdhdr, &tmpbuffer, sizeof(mdhdr));
  320         error = blk_write(di, (char *)&tmpbuffer, 0, PAGE_SIZE);
  321         if (error)
  322                 goto fail;
  323 
  324         /* Dump msgbuf up front */
  325         error = blk_write(di, (char *)msgbufp->msg_ptr, 0,
  326             round_page(msgbufp->msg_size));
  327         if (error)
  328                 goto fail;
  329 
  330         /* Dump bitmap */
  331         error = blk_write(di, (char *)vm_page_dump, 0,
  332             round_page(vm_page_dump_size));
  333         if (error)
  334                 goto fail;
  335 
  336         /* Dump kernel page directory pages */
  337         bzero(&tmpbuffer, sizeof(tmpbuffer));
  338         for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += L2_SIZE) {
  339                 if (!pmap_get_tables(pmap_kernel(), va, &l0, &l1, &l2, &l3)) {
  340                         /* We always write a page, even if it is zero */
  341                         error = blk_write(di, (char *)&tmpbuffer, 0, PAGE_SIZE);
  342                         if (error)
  343                                 goto fail;
  344                         /* flush, in case we reuse tmpbuffer in the same block*/
  345                         error = blk_flush(di);
  346                         if (error)
  347                                 goto fail;
  348                 } else if (l2 == NULL) {
  349                         pa = (*l1 & ~ATTR_MASK) | (va & L1_OFFSET);
  350 
  351                         /* Generate fake l3 entries based upon the l1 entry */
  352                         for (i = 0; i < Ln_ENTRIES; i++) {
  353                                 tmpbuffer[i] = pa + (i * PAGE_SIZE) |
  354                                     ATTR_DEFAULT | L3_PAGE;
  355                         }
  356                         /* We always write a page, even if it is zero */
  357                         error = blk_write(di, (char *)&tmpbuffer, 0, PAGE_SIZE);
  358                         if (error)
  359                                 goto fail;
  360                         /* flush, in case we reuse tmpbuffer in the same block*/
  361                         error = blk_flush(di);
  362                         if (error)
  363                                 goto fail;
  364                         bzero(&tmpbuffer, sizeof(tmpbuffer));
  365                 } else if ((*l2 & ATTR_DESCR_MASK) == L2_BLOCK) {
  366                         /* TODO: Handle an invalid L2 entry */
  367                         pa = (*l2 & ~ATTR_MASK) | (va & L2_OFFSET);
  368 
  369                         /* Generate fake l3 entries based upon the l1 entry */
  370                         for (i = 0; i < Ln_ENTRIES; i++) {
  371                                 tmpbuffer[i] = pa + (i * PAGE_SIZE) |
  372                                     ATTR_DEFAULT | L3_PAGE;
  373                         }
  374                         /* We always write a page, even if it is zero */
  375                         error = blk_write(di, (char *)&tmpbuffer, 0, PAGE_SIZE);
  376                         if (error)
  377                                 goto fail;
  378                         /* flush, in case we reuse fakepd in the same block */
  379                         error = blk_flush(di);
  380                         if (error)
  381                                 goto fail;
  382                         bzero(&tmpbuffer, sizeof(tmpbuffer));
  383                         continue;
  384                 } else {
  385                         pa = *l2 & ~ATTR_MASK;
  386 
  387                         /* We always write a page, even if it is zero */
  388                         error = blk_write(di, NULL, pa, PAGE_SIZE);
  389                         if (error)
  390                                 goto fail;
  391                 }
  392         }
  393 
  394         /* Dump memory chunks */
  395         /* XXX cluster it up and use blk_dump() */
  396         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  397                 bits = vm_page_dump[i];
  398                 while (bits) {
  399                         bit = ffsl(bits) - 1;
  400                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
  401                             bit) * PAGE_SIZE;
  402                         error = blk_write(di, 0, pa, PAGE_SIZE);
  403                         if (error)
  404                                 goto fail;
  405                         bits &= ~(1ul << bit);
  406                 }
  407         }
  408 
  409         error = blk_flush(di);
  410         if (error)
  411                 goto fail;
  412 
  413         /* Dump trailer */
  414         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  415         if (error)
  416                 goto fail;
  417         dumplo += sizeof(kdh);
  418 
  419         /* Signal completion, signoff and exit stage left. */
  420         dump_write(di, NULL, 0, 0, 0);
  421         printf("\nDump complete\n");
  422         return (0);
  423 
  424  fail:
  425         if (error < 0)
  426                 error = -error;
  427 
  428         printf("\n");
  429         if (error == ENOSPC) {
  430                 printf("Dump map grown while dumping. ");
  431                 if (retry_count < 5) {
  432                         printf("Retrying...\n");
  433                         goto retry;
  434                 }
  435                 printf("Dump failed.\n");
  436         }
  437         else if (error == ECANCELED)
  438                 printf("Dump aborted\n");
  439         else if (error == E2BIG)
  440                 printf("Dump failed. Partition too small.\n");
  441         else
  442                 printf("** DUMP FAILED (ERROR %d) **\n", error);
  443         return (error);
  444 }
  445 
  446 void
  447 dump_add_page(vm_paddr_t pa)
  448 {
  449         int idx, bit;
  450 
  451         pa >>= PAGE_SHIFT;
  452         idx = pa >> 6;          /* 2^6 = 64 */
  453         bit = pa & 63;
  454         atomic_set_long(&vm_page_dump[idx], 1ul << bit);
  455 }
  456 
  457 void
  458 dump_drop_page(vm_paddr_t pa)
  459 {
  460         int idx, bit;
  461 
  462         pa >>= PAGE_SHIFT;
  463         idx = pa >> 6;          /* 2^6 = 64 */
  464         bit = pa & 63;
  465         atomic_clear_long(&vm_page_dump[idx], 1ul << bit);
  466 }
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FreeBSD/Linux Kernel Cross Reference sys/arm64/arm64/minidump_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/arm64/arm64/minidump_machdep.c
