minidump_machdep.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2010 Oleksandr Tymoshenko <gonzo@freebsd.org>
    5  * Copyright (c) 2008 Semihalf, Grzegorz Bernacki
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  *
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  * from: FreeBSD: src/sys/arm/arm/minidump_machdep.c v214223
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/conf.h>
   38 #include <sys/cons.h>
   39 #include <sys/kernel.h>
   40 #include <sys/kerneldump.h>
   41 #include <sys/msgbuf.h>
   42 #include <sys/watchdog.h>
   43 #include <sys/vmmeter.h>
   44 #include <vm/vm.h>
   45 #include <vm/vm_param.h>
   46 #include <vm/pmap.h>
   47 #include <vm/vm_page.h>
   48 #include <vm/vm_phys.h>
   49 #include <vm/vm_dumpset.h>
   50 #include <machine/atomic.h>
   51 #include <machine/elf.h>
   52 #include <machine/md_var.h>
   53 #include <machine/minidump.h>
   54 #include <machine/cache.h>
   55 
   56 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   57 
   58 static struct kerneldumpheader kdh;
   59 
   60 /* Handle chunked writes. */
   61 static uint64_t counter, progress, dumpsize;
   62 /* Just auxiliary bufffer */
   63 static char tmpbuffer[PAGE_SIZE] __aligned(sizeof(uint64_t));
   64 
   65 extern pd_entry_t *kernel_segmap;
   66 
   67 static int
   68 is_dumpable(vm_paddr_t pa)
   69 {
   70         vm_page_t m;
   71         int i;
   72 
   73         if ((m = vm_phys_paddr_to_vm_page(pa)) != NULL)
   74                 return ((m->flags & PG_NODUMP) == 0);
   75         for (i = 0; dump_avail[i] != 0 || dump_avail[i + 1] != 0; i += 2) {
   76                 if (pa >= dump_avail[i] && pa < dump_avail[i + 1])
   77                         return (1);
   78         }
   79         return (0);
   80 }
   81 
   82 static struct {
   83         int min_per;
   84         int max_per;
   85         int visited;
   86 } progress_track[10] = {
   87         {  0,  10, 0},
   88         { 10,  20, 0},
   89         { 20,  30, 0},
   90         { 30,  40, 0},
   91         { 40,  50, 0},
   92         { 50,  60, 0},
   93         { 60,  70, 0},
   94         { 70,  80, 0},
   95         { 80,  90, 0},
   96         { 90, 100, 0}
   97 };
   98 
   99 static void
  100 report_progress(uint64_t progress, uint64_t dumpsize)
  101 {
  102         int sofar, i;
  103 
  104         sofar = 100 - ((progress * 100) / dumpsize);
  105         for (i = 0; i < nitems(progress_track); i++) {
  106                 if (sofar < progress_track[i].min_per ||
  107                     sofar > progress_track[i].max_per)
  108                         continue;
  109                 if (progress_track[i].visited)
  110                         return;
  111                 progress_track[i].visited = 1;
  112                 printf("..%d%%", sofar);
  113                 return;
  114         }
  115 }
  116 
  117 static int
  118 write_buffer(struct dumperinfo *di, char *ptr, size_t sz)
  119 {
  120         size_t len;
  121         int error, c;
  122         u_int maxdumpsz;
  123 
  124         maxdumpsz = di->maxiosize;
  125 
  126         if (maxdumpsz == 0)     /* seatbelt */
  127                 maxdumpsz = PAGE_SIZE;
  128 
  129         error = 0;
  130 
  131         while (sz) {
  132                 len = min(maxdumpsz, sz);
  133                 counter += len;
  134                 progress -= len;
  135 
  136                 if (counter >> 22) {
  137                         report_progress(progress, dumpsize);
  138                         counter &= (1<<22) - 1;
  139                 }
  140 
  141                 wdog_kern_pat(WD_LASTVAL);
  142 
  143                 if (ptr) {
  144                         error = dump_append(di, ptr, 0, len);
  145                         if (error)
  146                                 return (error);
  147                         ptr += len;
  148                         sz -= len;
  149                 } else {
  150                         panic("pa is not supported");
  151                 }
  152 
  153                 /* Check for user abort. */
  154                 c = cncheckc();
  155                 if (c == 0x03)
  156                         return (ECANCELED);
  157                 if (c != -1)
  158                         printf(" (CTRL-C to abort) ");
  159         }
  160 
  161         return (0);
  162 }
  163 
  164 int
  165 minidumpsys(struct dumperinfo *di)
  166 {
  167         struct minidumphdr mdhdr;
  168         uint64_t *dump_avail_buf;
  169         uint32_t ptesize;
  170         vm_paddr_t pa;
  171         vm_offset_t prev_pte = 0;
  172         uint32_t count = 0;
  173         vm_offset_t va;
  174         pt_entry_t *pte;
  175         int i, error;
  176         void *dump_va;
  177 
  178         /* Flush cache */
  179         mips_dcache_wbinv_all();
  180 
  181         counter = 0;
  182         /* Walk page table pages, set bits in vm_page_dump */
  183         ptesize = 0;
  184 
  185         for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
  186                 ptesize += PAGE_SIZE;
  187                 pte = pmap_pte(kernel_pmap, va);
  188                 KASSERT(pte != NULL, ("pte for %jx is NULL", (uintmax_t)va));
  189                 for (i = 0; i < NPTEPG; i++) {
  190                         if (pte_test(&pte[i], PTE_V)) {
  191                                 pa = TLBLO_PTE_TO_PA(pte[i]);
  192                                 if (is_dumpable(pa))
  193                                         dump_add_page(pa);
  194                         }
  195                 }
  196         }
  197 
  198         /*
  199          * Now mark pages from 0 to phys_avail[0], that's where kernel 
  200          * and pages allocated by pmap_steal reside
  201          */
  202         for (pa = 0; pa < phys_avail[0]; pa += PAGE_SIZE) {
  203                 if (is_dumpable(pa))
  204                         dump_add_page(pa);
  205         }
  206 
  207         /* Calculate dump size. */
  208         dumpsize = ptesize;
  209         dumpsize += round_page(msgbufp->msg_size);
  210         dumpsize += round_page(nitems(dump_avail) * sizeof(uint64_t));
  211         dumpsize += round_page(BITSET_SIZE(vm_page_dump_pages));
  212         VM_PAGE_DUMP_FOREACH(pa) {
  213                 /* Clear out undumpable pages now if needed */
  214                 if (is_dumpable(pa))
  215                         dumpsize += PAGE_SIZE;
  216                 else
  217                         dump_drop_page(pa);
  218         }
  219         dumpsize += PAGE_SIZE;
  220 
  221         progress = dumpsize;
  222 
  223         /* Initialize mdhdr */
  224         bzero(&mdhdr, sizeof(mdhdr));
  225         strcpy(mdhdr.magic, MINIDUMP_MAGIC);
  226         mdhdr.version = MINIDUMP_VERSION;
  227         mdhdr.msgbufsize = msgbufp->msg_size;
  228         mdhdr.bitmapsize = round_page(BITSET_SIZE(vm_page_dump_pages));
  229         mdhdr.ptesize = ptesize;
  230         mdhdr.kernbase = VM_MIN_KERNEL_ADDRESS;
  231         mdhdr.dumpavailsize = round_page(nitems(dump_avail) * sizeof(uint64_t));
  232 
  233         dump_init_header(di, &kdh, KERNELDUMPMAGIC, KERNELDUMP_MIPS_VERSION,
  234             dumpsize);
  235 
  236         error = dump_start(di, &kdh);
  237         if (error != 0)
  238                 goto fail;
  239 
  240         printf("Dumping %llu out of %ju MB:", (long long)dumpsize >> 20,
  241             ptoa((uintmax_t)physmem) / 1048576);
  242 
  243         /* Dump my header */
  244         bzero(tmpbuffer, sizeof(tmpbuffer));
  245         bcopy(&mdhdr, tmpbuffer, sizeof(mdhdr));
  246         error = write_buffer(di, tmpbuffer, PAGE_SIZE);
  247         if (error)
  248                 goto fail;
  249 
  250         /* Dump msgbuf up front */
  251         error = write_buffer(di, (char *)msgbufp->msg_ptr, 
  252             round_page(msgbufp->msg_size));
  253         if (error)
  254                 goto fail;
  255 
  256         /* Dump dump_avail.  Make a copy using 64-bit physical addresses. */
  257         _Static_assert(nitems(dump_avail) * sizeof(uint64_t) <=
  258             sizeof(tmpbuffer), "Large dump_avail not handled");
  259         bzero(tmpbuffer, sizeof(tmpbuffer));
  260         if (sizeof(dump_avail[0]) != sizeof(uint64_t)) {
  261                 dump_avail_buf = (uint64_t *)tmpbuffer;
  262                 for (i = 0; dump_avail[i] != 0 || dump_avail[i + 1] != 0; i++) {
  263                         dump_avail_buf[i] = dump_avail[i];
  264                         dump_avail_buf[i + 1] = dump_avail[i + 1];
  265                 }
  266         } else {
  267                 memcpy(tmpbuffer, dump_avail, sizeof(dump_avail));
  268         }
  269         error = write_buffer(di, tmpbuffer, PAGE_SIZE);
  270         if (error)
  271                 goto fail;
  272 
  273         /* Dump bitmap */
  274         error = write_buffer(di, (char *)vm_page_dump,
  275             round_page(BITSET_SIZE(vm_page_dump_pages)));
  276         if (error)
  277                 goto fail;
  278 
  279         /* Dump kernel page table pages */
  280         for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
  281                 pte = pmap_pte(kernel_pmap, va);
  282                 KASSERT(pte != NULL, ("pte for %jx is NULL", (uintmax_t)va));
  283                 if (!count) {
  284                         prev_pte = (vm_offset_t)pte;
  285                         count++;
  286                 } else {
  287                         if ((vm_offset_t)pte == (prev_pte + count * PAGE_SIZE))
  288                                 count++;
  289                         else {
  290                                 error = write_buffer(di, (char*)prev_pte,
  291                                     count * PAGE_SIZE);
  292                                 if (error)
  293                                         goto fail;
  294                                 count = 1;
  295                                 prev_pte = (vm_offset_t)pte;
  296                         }
  297                 }
  298         }
  299 
  300         if (count) {
  301                 error = write_buffer(di, (char*)prev_pte, count * PAGE_SIZE);
  302                 if (error)
  303                         goto fail;
  304                 count = 0;
  305                 prev_pte = 0;
  306         }
  307 
  308         /* Dump memory chunks  page by page*/
  309         VM_PAGE_DUMP_FOREACH(pa) {
  310                 dump_va = pmap_kenter_temporary(pa, 0);
  311                 error = write_buffer(di, dump_va, PAGE_SIZE);
  312                 if (error)
  313                         goto fail;
  314                 pmap_kenter_temporary_free(pa);
  315         }
  316 
  317         error = dump_finish(di, &kdh);
  318         if (error != 0)
  319                 goto fail;
  320 
  321         printf("\nDump complete\n");
  322         return (0);
  323 
  324 fail:
  325         if (error < 0)
  326                 error = -error;
  327 
  328         if (error == ECANCELED)
  329                 printf("\nDump aborted\n");
  330         else if (error == E2BIG || error == ENOSPC) {
  331                 printf("\nDump failed. Partition too small (about %lluMB were "
  332                     "needed this time).\n", (long long)dumpsize >> 20);
  333         } else
  334                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  335         return (error);
  336 }
Cache object: 937e56f3324769fa4230ac95dee9d684
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FreeBSD/Linux Kernel Cross Reference sys/mips/mips/minidump_machdep.c

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