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/mips/mips/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: stable/12/sys/mips/mips/minidump_machdep.c 333145 2018-05-01 17:32:43Z markj $");
   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/pmap.h>
   46 #include <vm/vm_page.h>
   47 #include <vm/vm_phys.h>
   48 #include <machine/atomic.h>
   49 #include <machine/elf.h>
   50 #include <machine/md_var.h>
   51 #include <machine/vmparam.h>
   52 #include <machine/minidump.h>
   53 #include <machine/cache.h>
   54 
   55 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   56 
   57 uint32_t *vm_page_dump;
   58 int vm_page_dump_size;
   59 
   60 static struct kerneldumpheader kdh;
   61 
   62 /* Handle chunked writes. */
   63 static uint64_t counter, progress, dumpsize;
   64 /* Just auxiliary bufffer */
   65 static char tmpbuffer[PAGE_SIZE];
   66 
   67 extern pd_entry_t *kernel_segmap;
   68 
   69 CTASSERT(sizeof(*vm_page_dump) == 4);
   70 
   71 static int
   72 is_dumpable(vm_paddr_t pa)
   73 {
   74         vm_page_t m;
   75         int i;
   76 
   77         if ((m = vm_phys_paddr_to_vm_page(pa)) != NULL)
   78                 return ((m->flags & PG_NODUMP) == 0);
   79         for (i = 0; dump_avail[i] != 0 || dump_avail[i + 1] != 0; i += 2) {
   80                 if (pa >= dump_avail[i] && pa < dump_avail[i + 1])
   81                         return (1);
   82         }
   83         return (0);
   84 }
   85 
   86 void
   87 dump_add_page(vm_paddr_t pa)
   88 {
   89         int idx, bit;
   90 
   91         pa >>= PAGE_SHIFT;
   92         idx = pa >> 5;          /* 2^5 = 32 */
   93         bit = pa & 31;
   94         atomic_set_int(&vm_page_dump[idx], 1ul << bit);
   95 }
   96 
   97 void
   98 dump_drop_page(vm_paddr_t pa)
   99 {
  100         int idx, bit;
  101 
  102         pa >>= PAGE_SHIFT;
  103         idx = pa >> 5;          /* 2^5 = 32 */
  104         bit = pa & 31;
  105         atomic_clear_int(&vm_page_dump[idx], 1ul << bit);
  106 }
  107 
  108 static struct {
  109         int min_per;
  110         int max_per;
  111         int visited;
  112 } progress_track[10] = {
  113         {  0,  10, 0},
  114         { 10,  20, 0},
  115         { 20,  30, 0},
  116         { 30,  40, 0},
  117         { 40,  50, 0},
  118         { 50,  60, 0},
  119         { 60,  70, 0},
  120         { 70,  80, 0},
  121         { 80,  90, 0},
  122         { 90, 100, 0}
  123 };
  124 
  125 static void
  126 report_progress(uint64_t progress, uint64_t dumpsize)
  127 {
  128         int sofar, i;
  129 
  130         sofar = 100 - ((progress * 100) / dumpsize);
  131         for (i = 0; i < nitems(progress_track); i++) {
  132                 if (sofar < progress_track[i].min_per ||
  133                     sofar > progress_track[i].max_per)
  134                         continue;
  135                 if (progress_track[i].visited)
  136                         return;
  137                 progress_track[i].visited = 1;
  138                 printf("..%d%%", sofar);
  139                 return;
  140         }
  141 }
  142 
  143 static int
  144 write_buffer(struct dumperinfo *di, char *ptr, size_t sz)
  145 {
  146         size_t len;
  147         int error, c;
  148         u_int maxdumpsz;
  149 
  150         maxdumpsz = di->maxiosize;
  151 
  152         if (maxdumpsz == 0)     /* seatbelt */
  153                 maxdumpsz = PAGE_SIZE;
  154 
  155         error = 0;
  156 
  157         while (sz) {
  158                 len = min(maxdumpsz, sz);
  159                 counter += len;
  160                 progress -= len;
  161 
  162                 if (counter >> 22) {
  163                         report_progress(progress, dumpsize);
  164                         counter &= (1<<22) - 1;
  165                 }
  166 
  167                 wdog_kern_pat(WD_LASTVAL);
  168 
  169                 if (ptr) {
  170                         error = dump_append(di, ptr, 0, len);
  171                         if (error)
  172                                 return (error);
  173                         ptr += len;
  174                         sz -= len;
  175                 } else {
  176                         panic("pa is not supported");
  177                 }
  178 
  179                 /* Check for user abort. */
  180                 c = cncheckc();
  181                 if (c == 0x03)
  182                         return (ECANCELED);
  183                 if (c != -1)
  184                         printf(" (CTRL-C to abort) ");
  185         }
  186 
  187         return (0);
  188 }
  189 
  190 int
  191 minidumpsys(struct dumperinfo *di)
  192 {
  193         struct minidumphdr mdhdr;
  194         uint32_t ptesize;
  195         uint32_t bits;
  196         vm_paddr_t pa;
  197         vm_offset_t prev_pte = 0;
  198         uint32_t count = 0;
  199         vm_offset_t va;
  200         pt_entry_t *pte;
  201         int i, bit, error;
  202         void *dump_va;
  203 
  204         /* Flush cache */
  205         mips_dcache_wbinv_all();
  206 
  207         counter = 0;
  208         /* Walk page table pages, set bits in vm_page_dump */
  209         ptesize = 0;
  210 
  211         for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
  212                 ptesize += PAGE_SIZE;
  213                 pte = pmap_pte(kernel_pmap, va);
  214                 KASSERT(pte != NULL, ("pte for %jx is NULL", (uintmax_t)va));
  215                 for (i = 0; i < NPTEPG; i++) {
  216                         if (pte_test(&pte[i], PTE_V)) {
  217                                 pa = TLBLO_PTE_TO_PA(pte[i]);
  218                                 if (is_dumpable(pa))
  219                                         dump_add_page(pa);
  220                         }
  221                 }
  222         }
  223 
  224         /*
  225          * Now mark pages from 0 to phys_avail[0], that's where kernel 
  226          * and pages allocated by pmap_steal reside
  227          */
  228         for (pa = 0; pa < phys_avail[0]; pa += PAGE_SIZE) {
  229                 if (is_dumpable(pa))
  230                         dump_add_page(pa);
  231         }
  232 
  233         /* Calculate dump size. */
  234         dumpsize = ptesize;
  235         dumpsize += round_page(msgbufp->msg_size);
  236         dumpsize += round_page(vm_page_dump_size);
  237         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  238                 bits = vm_page_dump[i];
  239                 while (bits) {
  240                         bit = ffs(bits) - 1;
  241                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
  242                             bit) * PAGE_SIZE;
  243                         /* Clear out undumpable pages now if needed */
  244                         if (is_dumpable(pa))
  245                                 dumpsize += PAGE_SIZE;
  246                         else
  247                                 dump_drop_page(pa);
  248                         bits &= ~(1ul << bit);
  249                 }
  250         }
  251         dumpsize += PAGE_SIZE;
  252 
  253         progress = dumpsize;
  254 
  255         /* Initialize mdhdr */
  256         bzero(&mdhdr, sizeof(mdhdr));
  257         strcpy(mdhdr.magic, MINIDUMP_MAGIC);
  258         mdhdr.version = MINIDUMP_VERSION;
  259         mdhdr.msgbufsize = msgbufp->msg_size;
  260         mdhdr.bitmapsize = vm_page_dump_size;
  261         mdhdr.ptesize = ptesize;
  262         mdhdr.kernbase = VM_MIN_KERNEL_ADDRESS;
  263 
  264         dump_init_header(di, &kdh, KERNELDUMPMAGIC, KERNELDUMP_MIPS_VERSION,
  265             dumpsize);
  266 
  267         error = dump_start(di, &kdh);
  268         if (error != 0)
  269                 goto fail;
  270 
  271         printf("Dumping %llu out of %ju MB:", (long long)dumpsize >> 20,
  272             ptoa((uintmax_t)physmem) / 1048576);
  273 
  274         /* Dump my header */
  275         bzero(tmpbuffer, sizeof(tmpbuffer));
  276         bcopy(&mdhdr, tmpbuffer, sizeof(mdhdr));
  277         error = write_buffer(di, tmpbuffer, PAGE_SIZE);
  278         if (error)
  279                 goto fail;
  280 
  281         /* Dump msgbuf up front */
  282         error = write_buffer(di, (char *)msgbufp->msg_ptr, 
  283             round_page(msgbufp->msg_size));
  284         if (error)
  285                 goto fail;
  286 
  287         /* Dump bitmap */
  288         error = write_buffer(di, (char *)vm_page_dump,
  289             round_page(vm_page_dump_size));
  290         if (error)
  291                 goto fail;
  292 
  293         /* Dump kernel page table pages */
  294         for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
  295                 pte = pmap_pte(kernel_pmap, va);
  296                 KASSERT(pte != NULL, ("pte for %jx is NULL", (uintmax_t)va));
  297                 if (!count) {
  298                         prev_pte = (vm_offset_t)pte;
  299                         count++;
  300                 } else {
  301                         if ((vm_offset_t)pte == (prev_pte + count * PAGE_SIZE))
  302                                 count++;
  303                         else {
  304                                 error = write_buffer(di, (char*)prev_pte,
  305                                     count * PAGE_SIZE);
  306                                 if (error)
  307                                         goto fail;
  308                                 count = 1;
  309                                 prev_pte = (vm_offset_t)pte;
  310                         }
  311                 }
  312         }
  313 
  314         if (count) {
  315                 error = write_buffer(di, (char*)prev_pte, count * PAGE_SIZE);
  316                 if (error)
  317                         goto fail;
  318                 count = 0;
  319                 prev_pte = 0;
  320         }
  321 
  322         /* Dump memory chunks  page by page*/
  323         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  324                 bits = vm_page_dump[i];
  325                 while (bits) {
  326                         bit = ffs(bits) - 1;
  327                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
  328                             bit) * PAGE_SIZE;
  329                         dump_va = pmap_kenter_temporary(pa, 0);
  330                         error = write_buffer(di, dump_va, PAGE_SIZE);
  331                         if (error)
  332                                 goto fail;
  333                         pmap_kenter_temporary_free(pa);
  334                         bits &= ~(1ul << bit);
  335                 }
  336         }
  337 
  338         error = dump_finish(di, &kdh);
  339         if (error != 0)
  340                 goto fail;
  341 
  342         printf("\nDump complete\n");
  343         return (0);
  344 
  345 fail:
  346         if (error < 0)
  347                 error = -error;
  348 
  349         if (error == ECANCELED)
  350                 printf("\nDump aborted\n");
  351         else if (error == E2BIG || error == ENOSPC)
  352                 printf("\nDump failed. Partition too small.\n");
  353         else
  354                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  355         return (error);
  356 }

Cache object: 913c39f083ec4a11bb588d6645b21c19


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