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 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 write_buffer(struct dumperinfo *di, char *ptr, size_t sz)
   69 {
   70         size_t len;
   71         int error, c;
   72         u_int maxdumpsz;
   73 
   74         maxdumpsz = di->maxiosize;
   75 
   76         if (maxdumpsz == 0)     /* seatbelt */
   77                 maxdumpsz = PAGE_SIZE;
   78 
   79         error = 0;
   80 
   81         while (sz) {
   82                 len = min(maxdumpsz, sz);
   83 
   84                 dumpsys_pb_progress(len);
   85                 wdog_kern_pat(WD_LASTVAL);
   86 
   87                 if (ptr) {
   88                         error = dump_append(di, ptr, 0, len);
   89                         if (error)
   90                                 return (error);
   91                         ptr += len;
   92                         sz -= len;
   93                 } else {
   94                         panic("pa is not supported");
   95                 }
   96 
   97                 /* Check for user abort. */
   98                 c = cncheckc();
   99                 if (c == 0x03)
  100                         return (ECANCELED);
  101                 if (c != -1)
  102                         printf(" (CTRL-C to abort) ");
  103         }
  104 
  105         return (0);
  106 }
  107 
  108 int
  109 cpu_minidumpsys(struct dumperinfo *di, const struct minidumpstate *state)
  110 {
  111         struct minidumphdr mdhdr;
  112         struct msgbuf *mbp;
  113         uint64_t *dump_avail_buf;
  114         uint32_t ptesize;
  115         vm_paddr_t pa;
  116         vm_offset_t prev_pte = 0;
  117         uint32_t count = 0;
  118         vm_offset_t va;
  119         pt_entry_t *pte;
  120         int i, error;
  121         void *dump_va;
  122 
  123         /* Live dumps are untested. */
  124         if (!dumping)
  125                 return (EOPNOTSUPP);
  126 
  127         /* Flush cache */
  128         mips_dcache_wbinv_all();
  129 
  130         /* Walk page table pages, set bits in vm_page_dump */
  131         ptesize = 0;
  132 
  133         for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
  134                 ptesize += PAGE_SIZE;
  135                 pte = pmap_pte(kernel_pmap, va);
  136                 KASSERT(pte != NULL, ("pte for %jx is NULL", (uintmax_t)va));
  137                 for (i = 0; i < NPTEPG; i++) {
  138                         if (pte_test(&pte[i], PTE_V)) {
  139                                 pa = TLBLO_PTE_TO_PA(pte[i]);
  140                                 if (vm_phys_is_dumpable(pa))
  141                                         vm_page_dump_add(state->dump_bitset,
  142                                             pa);
  143                         }
  144                 }
  145         }
  146 
  147         /*
  148          * Now mark pages from 0 to phys_avail[0], that's where kernel 
  149          * and pages allocated by pmap_steal reside
  150          */
  151         for (pa = 0; pa < phys_avail[0]; pa += PAGE_SIZE) {
  152                 if (vm_phys_is_dumpable(pa))
  153                         vm_page_dump_add(state->dump_bitset, pa);
  154         }
  155 
  156         /* Calculate dump size. */
  157         mbp = state->msgbufp;
  158         dumpsize = ptesize;
  159         dumpsize += round_page(mbp->msg_size);
  160         dumpsize += round_page(nitems(dump_avail) * sizeof(uint64_t));
  161         dumpsize += round_page(BITSET_SIZE(vm_page_dump_pages));
  162         VM_PAGE_DUMP_FOREACH(state->dump_bitset, pa) {
  163                 /* Clear out undumpable pages now if needed */
  164                 if (vm_phys_is_dumpable(pa))
  165                         dumpsize += PAGE_SIZE;
  166                 else
  167                         vm_page_dump_drop(state->dump_bitset, pa);
  168         }
  169         dumpsize += PAGE_SIZE;
  170 
  171         dumpsys_pb_init(dumpsize);
  172 
  173         /* Initialize mdhdr */
  174         bzero(&mdhdr, sizeof(mdhdr));
  175         strcpy(mdhdr.magic, MINIDUMP_MAGIC);
  176         mdhdr.version = MINIDUMP_VERSION;
  177         mdhdr.msgbufsize = mbp->msg_size;
  178         mdhdr.bitmapsize = round_page(BITSET_SIZE(vm_page_dump_pages));
  179         mdhdr.ptesize = ptesize;
  180         mdhdr.kernbase = VM_MIN_KERNEL_ADDRESS;
  181         mdhdr.dumpavailsize = round_page(nitems(dump_avail) * sizeof(uint64_t));
  182 
  183         dump_init_header(di, &kdh, KERNELDUMPMAGIC, KERNELDUMP_MIPS_VERSION,
  184             dumpsize);
  185 
  186         error = dump_start(di, &kdh);
  187         if (error != 0)
  188                 goto fail;
  189 
  190         printf("Dumping %llu out of %ju MB:", (long long)dumpsize >> 20,
  191             ptoa((uintmax_t)physmem) / 1048576);
  192 
  193         /* Dump my header */
  194         bzero(tmpbuffer, sizeof(tmpbuffer));
  195         bcopy(&mdhdr, tmpbuffer, sizeof(mdhdr));
  196         error = write_buffer(di, tmpbuffer, PAGE_SIZE);
  197         if (error)
  198                 goto fail;
  199 
  200         /* Dump msgbuf up front */
  201         error = write_buffer(di, mbp->msg_ptr, round_page(mbp->msg_size));
  202         if (error)
  203                 goto fail;
  204 
  205         /* Dump dump_avail.  Make a copy using 64-bit physical addresses. */
  206         _Static_assert(nitems(dump_avail) * sizeof(uint64_t) <=
  207             sizeof(tmpbuffer), "Large dump_avail not handled");
  208         bzero(tmpbuffer, sizeof(tmpbuffer));
  209         if (sizeof(dump_avail[0]) != sizeof(uint64_t)) {
  210                 dump_avail_buf = (uint64_t *)tmpbuffer;
  211                 for (i = 0; dump_avail[i] != 0 || dump_avail[i + 1] != 0; i++) {
  212                         dump_avail_buf[i] = dump_avail[i];
  213                         dump_avail_buf[i + 1] = dump_avail[i + 1];
  214                 }
  215         } else {
  216                 memcpy(tmpbuffer, dump_avail, sizeof(dump_avail));
  217         }
  218         error = write_buffer(di, tmpbuffer, PAGE_SIZE);
  219         if (error)
  220                 goto fail;
  221 
  222         /* Dump bitmap */
  223         error = write_buffer(di, (char *)vm_page_dump,
  224             round_page(BITSET_SIZE(vm_page_dump_pages)));
  225         if (error)
  226                 goto fail;
  227 
  228         /* Dump kernel page table pages */
  229         for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
  230                 pte = pmap_pte(kernel_pmap, va);
  231                 KASSERT(pte != NULL, ("pte for %jx is NULL", (uintmax_t)va));
  232                 if (!count) {
  233                         prev_pte = (vm_offset_t)pte;
  234                         count++;
  235                 } else {
  236                         if ((vm_offset_t)pte == (prev_pte + count * PAGE_SIZE))
  237                                 count++;
  238                         else {
  239                                 error = write_buffer(di, (char*)prev_pte,
  240                                     count * PAGE_SIZE);
  241                                 if (error)
  242                                         goto fail;
  243                                 count = 1;
  244                                 prev_pte = (vm_offset_t)pte;
  245                         }
  246                 }
  247         }
  248 
  249         if (count) {
  250                 error = write_buffer(di, (char*)prev_pte, count * PAGE_SIZE);
  251                 if (error)
  252                         goto fail;
  253                 count = 0;
  254                 prev_pte = 0;
  255         }
  256 
  257         /* Dump memory chunks page by page */
  258         VM_PAGE_DUMP_FOREACH(state->dump_bitset, pa) {
  259                 dump_va = pmap_kenter_temporary(pa, 0);
  260                 error = write_buffer(di, dump_va, PAGE_SIZE);
  261                 if (error)
  262                         goto fail;
  263                 pmap_kenter_temporary_free(pa);
  264         }
  265 
  266         error = dump_finish(di, &kdh);
  267         if (error != 0)
  268                 goto fail;
  269 
  270         printf("\nDump complete\n");
  271         return (0);
  272 
  273 fail:
  274         if (error < 0)
  275                 error = -error;
  276 
  277         if (error == ECANCELED)
  278                 printf("\nDump aborted\n");
  279         else if (error == E2BIG || error == ENOSPC) {
  280                 printf("\nDump failed. Partition too small (about %lluMB were "
  281                     "needed this time).\n", (long long)dumpsize >> 20);
  282         } else
  283                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  284         return (error);
  285 }
Cache object: a100531cfd82c2ee4404d0b132379bbe
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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
