minidump_machdep.c

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    1 /*-
    2  * Copyright (c) 2008 Semihalf, Grzegorz Bernacki
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  *
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  * from: FreeBSD: src/sys/i386/i386/minidump_machdep.c,v 1.6 2008/08/17 23:27:27
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include "opt_watchdog.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/conf.h>
   37 #include <sys/cons.h>
   38 #include <sys/kernel.h>
   39 #include <sys/kerneldump.h>
   40 #include <sys/msgbuf.h>
   41 #ifdef SW_WATCHDOG
   42 #include <sys/watchdog.h>
   43 #endif
   44 #include <vm/vm.h>
   45 #include <vm/pmap.h>
   46 #include <machine/atomic.h>
   47 #include <machine/elf.h>
   48 #include <machine/md_var.h>
   49 #include <machine/vmparam.h>
   50 #include <machine/minidump.h>
   51 #include <machine/cpufunc.h>
   52 
   53 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   54 
   55 /*
   56  * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
   57  * is to protect us from metadata and to protect metadata from us.
   58  */
   59 #define SIZEOF_METADATA         (64*1024)
   60 
   61 uint32_t *vm_page_dump;
   62 int vm_page_dump_size;
   63 
   64 static struct kerneldumpheader kdh;
   65 static off_t dumplo;
   66 
   67 /* Handle chunked writes. */
   68 static size_t fragsz, offset;
   69 static void *dump_va;
   70 static uint64_t counter, progress;
   71 
   72 CTASSERT(sizeof(*vm_page_dump) == 4);
   73 
   74 static int
   75 is_dumpable(vm_paddr_t pa)
   76 {
   77         int i;
   78 
   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 #define PG2MB(pgs) (((pgs) + (1 << 8) - 1) >> 8)
   87 
   88 static int
   89 blk_flush(struct dumperinfo *di)
   90 {
   91         int error;
   92 
   93         if (fragsz == 0)
   94                 return (0);
   95 
   96         error = dump_write(di, (char*)dump_va + offset, 0, dumplo, fragsz - offset);
   97         dumplo += (fragsz - offset);
   98         fragsz = 0;
   99         offset = 0;
  100         return (error);
  101 }
  102 
  103 static int
  104 blk_write(struct dumperinfo *di, char *ptr, vm_paddr_t pa, size_t sz)
  105 {
  106         size_t len;
  107         int error, i, c;
  108         u_int maxdumpsz;
  109 
  110         maxdumpsz = di->maxiosize;
  111 
  112         if (maxdumpsz == 0)     /* seatbelt */
  113                 maxdumpsz = PAGE_SIZE;
  114 
  115         error = 0;
  116 
  117         if (ptr != NULL && pa != 0) {
  118                 printf("cant have both va and pa!\n");
  119                 return (EINVAL);
  120         }
  121 
  122         if (ptr != NULL) {
  123                 /* If we're doing a virtual dump, flush any pre-existing pa pages */
  124                 error = blk_flush(di);
  125                 if (error)
  126                         return (error);
  127         }
  128 
  129         while (sz) {
  130                 if (fragsz == 0) {
  131                         offset = pa & PAGE_MASK;
  132                         fragsz += offset;
  133                 }
  134                 len = maxdumpsz - fragsz;
  135                 if (len > sz)
  136                         len = sz;
  137                 counter += len;
  138                 progress -= len;
  139 
  140                 if (counter >> 22) {
  141                         printf(" %lld", PG2MB(progress >> PAGE_SHIFT));
  142                         counter &= (1<<22) - 1;
  143                 }
  144 
  145 #ifdef SW_WATCHDOG
  146                 wdog_kern_pat(WD_LASTVAL);
  147 #endif
  148                 if (ptr) {
  149                         error = dump_write(di, ptr, 0, dumplo, len);
  150                         if (error)
  151                                 return (error);
  152                         dumplo += len;
  153                         ptr += len;
  154                         sz -= len;
  155                 } else {
  156                         for (i = 0; i < len; i += PAGE_SIZE)
  157                                 dump_va = pmap_kenter_temporary(pa + i,
  158                                     (i + fragsz) >> PAGE_SHIFT);
  159                         fragsz += len;
  160                         pa += len;
  161                         sz -= len;
  162                         if (fragsz == maxdumpsz) {
  163                                 error = blk_flush(di);
  164                                 if (error)
  165                                         return (error);
  166                         }
  167                 }
  168 
  169                 /* Check for user abort. */
  170                 c = cncheckc();
  171                 if (c == 0x03)
  172                         return (ECANCELED);
  173                 if (c != -1)
  174                         printf(" (CTRL-C to abort) ");
  175         }
  176 
  177         return (0);
  178 }
  179 
  180 static int
  181 blk_write_cont(struct dumperinfo *di, vm_paddr_t pa, size_t sz)
  182 {
  183         int error;
  184 
  185         error = blk_write(di, 0, pa, sz);
  186         if (error)
  187                 return (error);
  188 
  189         error = blk_flush(di);
  190         if (error)
  191                 return (error);
  192 
  193         return (0);
  194 }
  195 
  196 /* A fake page table page, to avoid having to handle both 4K and 2M pages */
  197 static pt_entry_t fakept[NPTEPG];
  198 
  199 void
  200 minidumpsys(struct dumperinfo *di)
  201 {
  202         struct minidumphdr mdhdr;
  203         uint64_t dumpsize;
  204         uint32_t ptesize;
  205         uint32_t bits;
  206         uint32_t pa, prev_pa = 0, count = 0;
  207         vm_offset_t va;
  208         pd_entry_t *pdp;
  209         pt_entry_t *pt, *ptp;
  210         int i, k, bit, error;
  211         char *addr;
  212 
  213         /*
  214          * Flush caches.  Note that in the SMP case this operates only on the
  215          * current CPU's L1 cache.  Before we reach this point, code in either
  216          * the system shutdown or kernel debugger has called stop_cpus() to stop
  217          * all cores other than this one.  Part of the ARM handling of
  218          * stop_cpus() is to call wbinv_all() on that core's local L1 cache.  So
  219          * by time we get to here, all that remains is to flush the L1 for the
  220          * current CPU, then the L2.
  221          */
  222         cpu_idcache_wbinv_all();
  223         cpu_l2cache_wbinv_all();
  224 
  225         counter = 0;
  226         /* Walk page table pages, set bits in vm_page_dump */
  227         ptesize = 0;
  228         for (va = KERNBASE; va < kernel_vm_end; va += NBPDR) {
  229                 /*
  230                  * We always write a page, even if it is zero. Each
  231                  * page written corresponds to 2MB of space
  232                  */
  233                 ptesize += L2_TABLE_SIZE_REAL;
  234                 pmap_get_pde_pte(pmap_kernel(), va, &pdp, &ptp);
  235                 if (pmap_pde_v(pdp) && pmap_pde_section(pdp)) {
  236                         /* This is a section mapping 1M page. */
  237                         pa = (*pdp & L1_S_ADDR_MASK) | (va & ~L1_S_ADDR_MASK);
  238                         for (k = 0; k < (L1_S_SIZE / PAGE_SIZE); k++) {
  239                                 if (is_dumpable(pa))
  240                                         dump_add_page(pa);
  241                                 pa += PAGE_SIZE;
  242                         }
  243                         continue;
  244                 }
  245                 if (pmap_pde_v(pdp) && pmap_pde_page(pdp)) {
  246                         /* Set bit for each valid page in this 1MB block */
  247                         addr = pmap_kenter_temporary(*pdp & L1_C_ADDR_MASK, 0);
  248                         pt = (pt_entry_t*)(addr +
  249                             (((uint32_t)*pdp  & L1_C_ADDR_MASK) & PAGE_MASK));
  250                         for (k = 0; k < 256; k++) {
  251                                 if ((pt[k] & L2_TYPE_MASK) == L2_TYPE_L) {
  252                                         pa = (pt[k] & L2_L_FRAME) |
  253                                             (va & L2_L_OFFSET);
  254                                         for (i = 0; i < 16; i++) {
  255                                                 if (is_dumpable(pa))
  256                                                         dump_add_page(pa);
  257                                                 k++;
  258                                                 pa += PAGE_SIZE;
  259                                         }
  260                                 } else if ((pt[k] & L2_TYPE_MASK) == L2_TYPE_S) {
  261                                         pa = (pt[k] & L2_S_FRAME) |
  262                                             (va & L2_S_OFFSET);
  263                                         if (is_dumpable(pa))
  264                                                 dump_add_page(pa);
  265                                 }
  266                         }
  267                 } else {
  268                         /* Nothing, we're going to dump a null page */
  269                 }
  270         }
  271 
  272         /* Calculate dump size. */
  273         dumpsize = ptesize;
  274         dumpsize += round_page(msgbufp->msg_size);
  275         dumpsize += round_page(vm_page_dump_size);
  276 
  277         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  278                 bits = vm_page_dump[i];
  279                 while (bits) {
  280                         bit = ffs(bits) - 1;
  281                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
  282                             bit) * PAGE_SIZE;
  283                         /* Clear out undumpable pages now if needed */
  284                         if (is_dumpable(pa))
  285                                 dumpsize += PAGE_SIZE;
  286                         else
  287                                 dump_drop_page(pa);
  288                         bits &= ~(1ul << bit);
  289                 }
  290         }
  291 
  292         dumpsize += PAGE_SIZE;
  293 
  294         /* Determine dump offset on device. */
  295         if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
  296                 error = ENOSPC;
  297                 goto fail;
  298         }
  299 
  300         dumplo = di->mediaoffset + di->mediasize - dumpsize;
  301         dumplo -= sizeof(kdh) * 2;
  302         progress = dumpsize;
  303 
  304         /* Initialize mdhdr */
  305         bzero(&mdhdr, sizeof(mdhdr));
  306         strcpy(mdhdr.magic, MINIDUMP_MAGIC);
  307         mdhdr.version = MINIDUMP_VERSION;
  308         mdhdr.msgbufsize = msgbufp->msg_size;
  309         mdhdr.bitmapsize = vm_page_dump_size;
  310         mdhdr.ptesize = ptesize;
  311         mdhdr.kernbase = KERNBASE;
  312 
  313         mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_ARM_VERSION, dumpsize,
  314             di->blocksize);
  315 
  316         printf("Physical memory: %u MB\n", ptoa((uintmax_t)physmem) / 1048576);
  317         printf("Dumping %llu MB:", (long long)dumpsize >> 20);
  318 
  319         /* Dump leader */
  320         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  321         if (error)
  322                 goto fail;
  323         dumplo += sizeof(kdh);
  324 
  325         /* Dump my header */
  326         bzero(&fakept, sizeof(fakept));
  327         bcopy(&mdhdr, &fakept, sizeof(mdhdr));
  328         error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
  329         if (error)
  330                 goto fail;
  331 
  332         /* Dump msgbuf up front */
  333         error = blk_write(di, (char *)msgbufp->msg_ptr, 0, round_page(msgbufp->msg_size));
  334         if (error)
  335                 goto fail;
  336 
  337         /* Dump bitmap */
  338         error = blk_write(di, (char *)vm_page_dump, 0,
  339             round_page(vm_page_dump_size));
  340         if (error)
  341                 goto fail;
  342 
  343         /* Dump kernel page table pages */
  344         for (va = KERNBASE; va < kernel_vm_end; va += NBPDR) {
  345                 /* We always write a page, even if it is zero */
  346                 pmap_get_pde_pte(pmap_kernel(), va, &pdp, &ptp);
  347 
  348                 if (pmap_pde_v(pdp) && pmap_pde_section(pdp))  {
  349                         if (count) {
  350                                 error = blk_write_cont(di, prev_pa,
  351                                     count * L2_TABLE_SIZE_REAL);
  352                                 if (error)
  353                                         goto fail;
  354                                 count = 0;
  355                                 prev_pa = 0;
  356                         }
  357                         /* This is a single 2M block. Generate a fake PTP */
  358                         pa = (*pdp & L1_S_ADDR_MASK) | (va & ~L1_S_ADDR_MASK);
  359                         for (k = 0; k < (L1_S_SIZE / PAGE_SIZE); k++) {
  360                                 fakept[k] = L2_S_PROTO | (pa + (k * PAGE_SIZE)) |
  361                                     L2_S_PROT(PTE_KERNEL,
  362                                     VM_PROT_READ | VM_PROT_WRITE);
  363                         }
  364                         error = blk_write(di, (char *)&fakept, 0,
  365                             L2_TABLE_SIZE_REAL);
  366                         if (error)
  367                                 goto fail;
  368                         /* Flush, in case we reuse fakept in the same block */
  369                         error = blk_flush(di);
  370                         if (error)
  371                                 goto fail;
  372                         continue;
  373                 }
  374                 if (pmap_pde_v(pdp) && pmap_pde_page(pdp)) {
  375                         pa = *pdp & L1_C_ADDR_MASK;
  376                         if (!count) {
  377                                 prev_pa = pa;
  378                                 count++;
  379                         }
  380                         else {
  381                                 if (pa == (prev_pa + count * L2_TABLE_SIZE_REAL))
  382                                         count++;
  383                                 else {
  384                                         error = blk_write_cont(di, prev_pa,
  385                                             count * L2_TABLE_SIZE_REAL);
  386                                         if (error)
  387                                                 goto fail;
  388                                         count = 1;
  389                                         prev_pa = pa;
  390                                 }
  391                         }
  392                 } else {
  393                         if (count) {
  394                                 error = blk_write_cont(di, prev_pa,
  395                                     count * L2_TABLE_SIZE_REAL);
  396                                 if (error)
  397                                         goto fail;
  398                                 count = 0;
  399                                 prev_pa = 0;
  400                         }
  401                         bzero(fakept, sizeof(fakept));
  402                         error = blk_write(di, (char *)&fakept, 0,
  403                             L2_TABLE_SIZE_REAL);
  404                         if (error)
  405                                 goto fail;
  406                         /* Flush, in case we reuse fakept in the same block */
  407                         error = blk_flush(di);
  408                         if (error)
  409                                 goto fail;
  410                 }
  411         }
  412 
  413         if (count) {
  414                 error = blk_write_cont(di, prev_pa, count * L2_TABLE_SIZE_REAL);
  415                 if (error)
  416                         goto fail;
  417                 count = 0;
  418                 prev_pa = 0;
  419         }
  420 
  421         /* Dump memory chunks */
  422         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  423                 bits = vm_page_dump[i];
  424                 while (bits) {
  425                         bit = ffs(bits) - 1;
  426                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
  427                             bit) * PAGE_SIZE;
  428                         if (!count) {
  429                                 prev_pa = pa;
  430                                 count++;
  431                         } else {
  432                                 if (pa == (prev_pa + count * PAGE_SIZE))
  433                                         count++;
  434                                 else {
  435                                         error = blk_write_cont(di, prev_pa,
  436                                             count * PAGE_SIZE);
  437                                         if (error)
  438                                                 goto fail;
  439                                         count = 1;
  440                                         prev_pa = pa;
  441                                 }
  442                         }
  443                         bits &= ~(1ul << bit);
  444                 }
  445         }
  446         if (count) {
  447                 error = blk_write_cont(di, prev_pa, count * PAGE_SIZE);
  448                 if (error)
  449                         goto fail;
  450                 count = 0;
  451                 prev_pa = 0;
  452         }
  453 
  454         /* Dump trailer */
  455         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  456         if (error)
  457                 goto fail;
  458         dumplo += sizeof(kdh);
  459 
  460         /* Signal completion, signoff and exit stage left. */
  461         dump_write(di, NULL, 0, 0, 0);
  462         printf("\nDump complete\n");
  463         return;
  464 
  465 fail:
  466         if (error < 0)
  467                 error = -error;
  468 
  469         if (error == ECANCELED)
  470                 printf("\nDump aborted\n");
  471         else if (error == ENOSPC)
  472                 printf("\nDump failed. Partition too small.\n");
  473         else
  474                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  475 }
  476 
  477 void
  478 dump_add_page(vm_paddr_t pa)
  479 {
  480         int idx, bit;
  481 
  482         pa >>= PAGE_SHIFT;
  483         idx = pa >> 5;          /* 2^5 = 32 */
  484         bit = pa & 31;
  485         atomic_set_int(&vm_page_dump[idx], 1ul << bit);
  486 }
  487 
  488 void
  489 dump_drop_page(vm_paddr_t pa)
  490 {
  491         int idx, bit;
  492 
  493         pa >>= PAGE_SHIFT;
  494         idx = pa >> 5;          /* 2^5 = 32 */
  495         bit = pa & 31;
  496         atomic_clear_int(&vm_page_dump[idx], 1ul << bit);
  497 }
Cache object: 845c687303ef03871edf7d3ed1964da2
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FreeBSD/Linux Kernel Cross Reference sys/arm/arm/minidump_machdep.c

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