minidump_machdep.c

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    1 /*-
    2  * Copyright (c) 2010 Oleksandr Tymoshenko <gonzo@freebsd.org>
    3  * Copyright (c) 2008 Semihalf, Grzegorz Bernacki
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  *
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  *
   27  * from: FreeBSD: src/sys/arm/arm/minidump_machdep.c v214223
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/11.1/sys/mips/mips/minidump_machdep.c 295880 2016-02-22 09:02:20Z skra $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/conf.h>
   36 #include <sys/cons.h>
   37 #include <sys/kernel.h>
   38 #include <sys/kerneldump.h>
   39 #include <sys/msgbuf.h>
   40 #include <vm/vm.h>
   41 #include <vm/pmap.h>
   42 #include <machine/atomic.h>
   43 #include <machine/elf.h>
   44 #include <machine/md_var.h>
   45 #include <machine/vmparam.h>
   46 #include <machine/minidump.h>
   47 #include <machine/cache.h>
   48 
   49 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   50 
   51 /*
   52  * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
   53  * is to protect us from metadata and to protect metadata from us.
   54  */
   55 #define SIZEOF_METADATA         (64*1024)
   56 
   57 uint32_t *vm_page_dump;
   58 int vm_page_dump_size;
   59 
   60 static struct kerneldumpheader kdh;
   61 static off_t dumplo;
   62 static off_t origdumplo;
   63 
   64 /* Handle chunked writes. */
   65 static uint64_t counter, progress;
   66 /* Just auxiliary bufffer */
   67 static char tmpbuffer[PAGE_SIZE];
   68 
   69 extern pd_entry_t *kernel_segmap;
   70 
   71 CTASSERT(sizeof(*vm_page_dump) == 4);
   72 
   73 static int
   74 is_dumpable(vm_paddr_t pa)
   75 {
   76         int i;
   77 
   78         for (i = 0; dump_avail[i] != 0 || dump_avail[i + 1] != 0; i += 2) {
   79                 if (pa >= dump_avail[i] && pa < dump_avail[i + 1])
   80                         return (1);
   81         }
   82         return (0);
   83 }
   84 
   85 void
   86 dump_add_page(vm_paddr_t pa)
   87 {
   88         int idx, bit;
   89 
   90         pa >>= PAGE_SHIFT;
   91         idx = pa >> 5;          /* 2^5 = 32 */
   92         bit = pa & 31;
   93         atomic_set_int(&vm_page_dump[idx], 1ul << bit);
   94 }
   95 
   96 void
   97 dump_drop_page(vm_paddr_t pa)
   98 {
   99         int idx, bit;
  100 
  101         pa >>= PAGE_SHIFT;
  102         idx = pa >> 5;          /* 2^5 = 32 */
  103         bit = pa & 31;
  104         atomic_clear_int(&vm_page_dump[idx], 1ul << bit);
  105 }
  106 
  107 #define PG2MB(pgs) (((pgs) + (1 << 8) - 1) >> 8)
  108 
  109 static int
  110 write_buffer(struct dumperinfo *di, char *ptr, size_t sz)
  111 {
  112         size_t len;
  113         int error, c;
  114         u_int maxdumpsz;
  115 
  116         maxdumpsz = di->maxiosize;
  117 
  118         if (maxdumpsz == 0)     /* seatbelt */
  119                 maxdumpsz = PAGE_SIZE;
  120 
  121         error = 0;
  122 
  123         while (sz) {
  124                 len = min(maxdumpsz, sz);
  125                 counter += len;
  126                 progress -= len;
  127 
  128                 if (counter >> 22) {
  129                         printf(" %jd", PG2MB(progress >> PAGE_SHIFT));
  130                         counter &= (1<<22) - 1;
  131                 }
  132 
  133                 if (ptr) {
  134                         error = dump_write(di, ptr, 0, dumplo, len);
  135                         if (error)
  136                                 return (error);
  137                         dumplo += len;
  138                         ptr += len;
  139                         sz -= len;
  140                 } else {
  141                         panic("pa is not supported");
  142                 }
  143 
  144                 /* Check for user abort. */
  145                 c = cncheckc();
  146                 if (c == 0x03)
  147                         return (ECANCELED);
  148                 if (c != -1)
  149                         printf(" (CTRL-C to abort) ");
  150         }
  151 
  152         return (0);
  153 }
  154 
  155 int
  156 minidumpsys(struct dumperinfo *di)
  157 {
  158         struct minidumphdr mdhdr;
  159         uint64_t dumpsize;
  160         uint32_t ptesize;
  161         uint32_t bits;
  162         vm_paddr_t pa;
  163         vm_offset_t prev_pte = 0;
  164         uint32_t count = 0;
  165         vm_offset_t va;
  166         pt_entry_t *pte;
  167         int i, bit, error;
  168         void *dump_va;
  169 
  170         /* Flush cache */
  171         mips_dcache_wbinv_all();
  172 
  173         counter = 0;
  174         /* Walk page table pages, set bits in vm_page_dump */
  175         ptesize = 0;
  176 
  177         for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
  178                 ptesize += PAGE_SIZE;
  179                 pte = pmap_pte(kernel_pmap, va);
  180                 KASSERT(pte != NULL, ("pte for %jx is NULL", (uintmax_t)va));
  181                 for (i = 0; i < NPTEPG; i++) {
  182                         if (pte_test(&pte[i], PTE_V)) {
  183                                 pa = TLBLO_PTE_TO_PA(pte[i]);
  184                                 if (is_dumpable(pa))
  185                                         dump_add_page(pa);
  186                         }
  187                 }
  188         }
  189 
  190         /*
  191          * Now mark pages from 0 to phys_avail[0], that's where kernel 
  192          * and pages allocated by pmap_steal reside
  193          */
  194         for (pa = 0; pa < phys_avail[0]; pa += PAGE_SIZE) {
  195                 if (is_dumpable(pa))
  196                         dump_add_page(pa);
  197         }
  198 
  199         /* Calculate dump size. */
  200         dumpsize = ptesize;
  201         dumpsize += round_page(msgbufp->msg_size);
  202         dumpsize += round_page(vm_page_dump_size);
  203 
  204         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  205                 bits = vm_page_dump[i];
  206                 while (bits) {
  207                         bit = ffs(bits) - 1;
  208                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
  209                             bit) * PAGE_SIZE;
  210                         /* Clear out undumpable pages now if needed */
  211                         if (is_dumpable(pa))
  212                                 dumpsize += PAGE_SIZE;
  213                         else
  214                                 dump_drop_page(pa);
  215                         bits &= ~(1ul << bit);
  216                 }
  217         }
  218 
  219         dumpsize += PAGE_SIZE;
  220 
  221         /* Determine dump offset on device. */
  222         if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
  223                 error = ENOSPC;
  224                 goto fail;
  225         }
  226 
  227         origdumplo = dumplo = di->mediaoffset + di->mediasize - dumpsize;
  228         dumplo -= sizeof(kdh) * 2;
  229         progress = dumpsize;
  230 
  231         /* Initialize mdhdr */
  232         bzero(&mdhdr, sizeof(mdhdr));
  233         strcpy(mdhdr.magic, MINIDUMP_MAGIC);
  234         mdhdr.version = MINIDUMP_VERSION;
  235         mdhdr.msgbufsize = msgbufp->msg_size;
  236         mdhdr.bitmapsize = vm_page_dump_size;
  237         mdhdr.ptesize = ptesize;
  238         mdhdr.kernbase = VM_MIN_KERNEL_ADDRESS;
  239 
  240         mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_MIPS_VERSION, dumpsize,
  241             di->blocksize);
  242 
  243         printf("Physical memory: %ju MB\n", 
  244             (uintmax_t)ptoa((uintmax_t)physmem) / 1048576);
  245         printf("Dumping %llu MB:", (long long)dumpsize >> 20);
  246 
  247         /* Dump leader */
  248         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  249         if (error)
  250                 goto fail;
  251         dumplo += sizeof(kdh);
  252 
  253         /* Dump my header */
  254         bzero(tmpbuffer, sizeof(tmpbuffer));
  255         bcopy(&mdhdr, tmpbuffer, sizeof(mdhdr));
  256         error = write_buffer(di, tmpbuffer, PAGE_SIZE);
  257         if (error)
  258                 goto fail;
  259 
  260         /* Dump msgbuf up front */
  261         error = write_buffer(di, (char *)msgbufp->msg_ptr, 
  262             round_page(msgbufp->msg_size));
  263         if (error)
  264                 goto fail;
  265 
  266         /* Dump bitmap */
  267         error = write_buffer(di, (char *)vm_page_dump,
  268             round_page(vm_page_dump_size));
  269         if (error)
  270                 goto fail;
  271 
  272         /* Dump kernel page table pages */
  273         for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
  274                 pte = pmap_pte(kernel_pmap, va);
  275                 KASSERT(pte != NULL, ("pte for %jx is NULL", (uintmax_t)va));
  276                 if (!count) {
  277                         prev_pte = (vm_offset_t)pte;
  278                         count++;
  279                 }
  280                 else {
  281                         if ((vm_offset_t)pte == (prev_pte + count * PAGE_SIZE))
  282                                 count++;
  283                         else {
  284                                 error = write_buffer(di, (char*)prev_pte,
  285                                     count * PAGE_SIZE);
  286                                 if (error)
  287                                         goto fail;
  288                                 count = 1;
  289                                 prev_pte = (vm_offset_t)pte;
  290                         }
  291                 }
  292         }
  293 
  294         if (count) {
  295                 error = write_buffer(di, (char*)prev_pte, count * PAGE_SIZE);
  296                 if (error)
  297                         goto fail;
  298                 count = 0;
  299                 prev_pte = 0;
  300         }
  301 
  302         /* Dump memory chunks  page by page*/
  303         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  304                 bits = vm_page_dump[i];
  305                 while (bits) {
  306                         bit = ffs(bits) - 1;
  307                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
  308                             bit) * PAGE_SIZE;
  309                         dump_va = pmap_kenter_temporary(pa, 0);
  310                         error = write_buffer(di, dump_va, PAGE_SIZE);
  311                         if (error)
  312                                 goto fail;
  313                         pmap_kenter_temporary_free(pa);
  314                         bits &= ~(1ul << bit);
  315                 }
  316         }
  317 
  318         /* Dump trailer */
  319         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  320         if (error)
  321                 goto fail;
  322         dumplo += sizeof(kdh);
  323 
  324         /* Signal completion, signoff and exit stage left. */
  325         dump_write(di, NULL, 0, 0, 0);
  326         printf("\nDump complete\n");
  327         return (0);
  328 
  329 fail:
  330         if (error < 0)
  331                 error = -error;
  332 
  333         if (error == ECANCELED)
  334                 printf("\nDump aborted\n");
  335         else if (error == ENOSPC)
  336                 printf("\nDump failed. Partition too small.\n");
  337         else
  338                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  339         return (error);
  340 }
Cache object: 6f0ffcb211f23aad71a3fbf6961c54ca
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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
