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: releng/9.0/sys/arm/arm/minidump_machdep.c 221173 2011-04-28 16:02:05Z attilio $");
   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/pmap.h>
   47 #include <machine/atomic.h>
   48 #include <machine/elf.h>
   49 #include <machine/md_var.h>
   50 #include <machine/vmparam.h>
   51 #include <machine/minidump.h>
   52 #include <machine/cpufunc.h>
   53 
   54 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   55 
   56 /*
   57  * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
   58  * is to protect us from metadata and to protect metadata from us.
   59  */
   60 #define SIZEOF_METADATA         (64*1024)
   61 
   62 uint32_t *vm_page_dump;
   63 int vm_page_dump_size;
   64 
   65 static struct kerneldumpheader kdh;
   66 static off_t dumplo;
   67 
   68 /* Handle chunked writes. */
   69 static size_t fragsz, offset;
   70 static void *dump_va;
   71 static uint64_t counter, progress;
   72 
   73 CTASSERT(sizeof(*vm_page_dump) == 4);
   74 
   75 static int
   76 is_dumpable(vm_paddr_t pa)
   77 {
   78         int i;
   79 
   80         for (i = 0; dump_avail[i] != 0 || dump_avail[i + 1] != 0; i += 2) {
   81                 if (pa >= dump_avail[i] && pa < dump_avail[i + 1])
   82                         return (1);
   83         }
   84         return (0);
   85 }
   86 
   87 #define PG2MB(pgs) (((pgs) + (1 << 8) - 1) >> 8)
   88 
   89 static int
   90 blk_flush(struct dumperinfo *di)
   91 {
   92         int error;
   93 
   94         if (fragsz == 0)
   95                 return (0);
   96 
   97         error = dump_write(di, (char*)dump_va + offset, 0, dumplo, fragsz - offset);
   98         dumplo += (fragsz - offset);
   99         fragsz = 0;
  100         offset = 0;
  101         return (error);
  102 }
  103 
  104 static int
  105 blk_write(struct dumperinfo *di, char *ptr, vm_paddr_t pa, size_t sz)
  106 {
  107         size_t len;
  108         int error, i, c;
  109         u_int maxdumpsz;
  110 
  111         maxdumpsz = di->maxiosize;
  112 
  113         if (maxdumpsz == 0)     /* seatbelt */
  114                 maxdumpsz = PAGE_SIZE;
  115 
  116         error = 0;
  117 
  118         if (ptr != NULL && pa != 0) {
  119                 printf("cant have both va and pa!\n");
  120                 return (EINVAL);
  121         }
  122 
  123         if (ptr != NULL) {
  124                 /* If we're doing a virtual dump, flush any pre-existing pa pages */
  125                 error = blk_flush(di);
  126                 if (error)
  127                         return (error);
  128         }
  129 
  130         while (sz) {
  131                 if (fragsz == 0) {
  132                         offset = pa & PAGE_MASK;
  133                         fragsz += offset;
  134                 }
  135                 len = maxdumpsz - fragsz;
  136                 if (len > sz)
  137                         len = sz;
  138                 counter += len;
  139                 progress -= len;
  140 
  141                 if (counter >> 22) {
  142                         printf(" %lld", PG2MB(progress >> PAGE_SHIFT));
  143                         counter &= (1<<22) - 1;
  144                 }
  145 
  146 #ifdef SW_WATCHDOG
  147                 wdog_kern_pat(WD_LASTVAL);
  148 #endif
  149                 if (ptr) {
  150                         error = dump_write(di, ptr, 0, dumplo, len);
  151                         if (error)
  152                                 return (error);
  153                         dumplo += len;
  154                         ptr += len;
  155                         sz -= len;
  156                 } else {
  157                         for (i = 0; i < len; i += PAGE_SIZE)
  158                                 dump_va = pmap_kenter_temp(pa + i,
  159                                     (i + fragsz) >> PAGE_SHIFT);
  160                         fragsz += len;
  161                         pa += len;
  162                         sz -= len;
  163                         if (fragsz == maxdumpsz) {
  164                                 error = blk_flush(di);
  165                                 if (error)
  166                                         return (error);
  167                         }
  168                 }
  169 
  170                 /* Check for user abort. */
  171                 c = cncheckc();
  172                 if (c == 0x03)
  173                         return (ECANCELED);
  174                 if (c != -1)
  175                         printf(" (CTRL-C to abort) ");
  176         }
  177 
  178         return (0);
  179 }
  180 
  181 static int
  182 blk_write_cont(struct dumperinfo *di, vm_paddr_t pa, size_t sz)
  183 {
  184         int error;
  185 
  186         error = blk_write(di, 0, pa, sz);
  187         if (error)
  188                 return (error);
  189 
  190         error = blk_flush(di);
  191         if (error)
  192                 return (error);
  193 
  194         return (0);
  195 }
  196 
  197 /* A fake page table page, to avoid having to handle both 4K and 2M pages */
  198 static pt_entry_t fakept[NPTEPG];
  199 
  200 void
  201 minidumpsys(struct dumperinfo *di)
  202 {
  203         struct minidumphdr mdhdr;
  204         uint64_t dumpsize;
  205         uint32_t ptesize;
  206         uint32_t bits;
  207         uint32_t pa, prev_pa = 0, count = 0;
  208         vm_offset_t va;
  209         pd_entry_t *pdp;
  210         pt_entry_t *pt, *ptp;
  211         int i, k, bit, error;
  212         char *addr;
  213 
  214         /* Flush cache */
  215         cpu_idcache_wbinv_all();
  216         cpu_l2cache_wbinv_all();
  217 
  218         counter = 0;
  219         /* Walk page table pages, set bits in vm_page_dump */
  220         ptesize = 0;
  221         for (va = KERNBASE; va < kernel_vm_end; va += NBPDR) {
  222                 /*
  223                  * We always write a page, even if it is zero. Each
  224                  * page written corresponds to 2MB of space
  225                  */
  226                 ptesize += L2_TABLE_SIZE_REAL;
  227                 pmap_get_pde_pte(pmap_kernel(), va, &pdp, &ptp);
  228                 if (pmap_pde_v(pdp) && pmap_pde_section(pdp)) {
  229                         /* This is a section mapping 1M page. */
  230                         pa = (*pdp & L1_S_ADDR_MASK) | (va & ~L1_S_ADDR_MASK);
  231                         for (k = 0; k < (L1_S_SIZE / PAGE_SIZE); k++) {
  232                                 if (is_dumpable(pa))
  233                                         dump_add_page(pa);
  234                                 pa += PAGE_SIZE;
  235                         }
  236                         continue;
  237                 }
  238                 if (pmap_pde_v(pdp) && pmap_pde_page(pdp)) {
  239                         /* Set bit for each valid page in this 1MB block */
  240                         addr = pmap_kenter_temp(*pdp & L1_C_ADDR_MASK, 0);
  241                         pt = (pt_entry_t*)(addr +
  242                             (((uint32_t)*pdp  & L1_C_ADDR_MASK) & PAGE_MASK));
  243                         for (k = 0; k < 256; k++) {
  244                                 if ((pt[k] & L2_TYPE_MASK) == L2_TYPE_L) {
  245                                         pa = (pt[k] & L2_L_FRAME) |
  246                                             (va & L2_L_OFFSET);
  247                                         for (i = 0; i < 16; i++) {
  248                                                 if (is_dumpable(pa))
  249                                                         dump_add_page(pa);
  250                                                 k++;
  251                                                 pa += PAGE_SIZE;
  252                                         }
  253                                 } else if ((pt[k] & L2_TYPE_MASK) == L2_TYPE_S) {
  254                                         pa = (pt[k] & L2_S_FRAME) |
  255                                             (va & L2_S_OFFSET);
  256                                         if (is_dumpable(pa))
  257                                                 dump_add_page(pa);
  258                                 }
  259                         }
  260                 } else {
  261                         /* Nothing, we're going to dump a null page */
  262                 }
  263         }
  264 
  265         /* Calculate dump size. */
  266         dumpsize = ptesize;
  267         dumpsize += round_page(msgbufp->msg_size);
  268         dumpsize += round_page(vm_page_dump_size);
  269 
  270         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  271                 bits = vm_page_dump[i];
  272                 while (bits) {
  273                         bit = ffs(bits) - 1;
  274                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
  275                             bit) * PAGE_SIZE;
  276                         /* Clear out undumpable pages now if needed */
  277                         if (is_dumpable(pa))
  278                                 dumpsize += PAGE_SIZE;
  279                         else
  280                                 dump_drop_page(pa);
  281                         bits &= ~(1ul << bit);
  282                 }
  283         }
  284 
  285         dumpsize += PAGE_SIZE;
  286 
  287         /* Determine dump offset on device. */
  288         if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
  289                 error = ENOSPC;
  290                 goto fail;
  291         }
  292 
  293         dumplo = di->mediaoffset + di->mediasize - dumpsize;
  294         dumplo -= sizeof(kdh) * 2;
  295         progress = dumpsize;
  296 
  297         /* Initialize mdhdr */
  298         bzero(&mdhdr, sizeof(mdhdr));
  299         strcpy(mdhdr.magic, MINIDUMP_MAGIC);
  300         mdhdr.version = MINIDUMP_VERSION;
  301         mdhdr.msgbufsize = msgbufp->msg_size;
  302         mdhdr.bitmapsize = vm_page_dump_size;
  303         mdhdr.ptesize = ptesize;
  304         mdhdr.kernbase = KERNBASE;
  305 
  306         mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_ARM_VERSION, dumpsize,
  307             di->blocksize);
  308 
  309         printf("Physical memory: %u MB\n", ptoa((uintmax_t)physmem) / 1048576);
  310         printf("Dumping %llu MB:", (long long)dumpsize >> 20);
  311 
  312         /* Dump leader */
  313         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  314         if (error)
  315                 goto fail;
  316         dumplo += sizeof(kdh);
  317 
  318         /* Dump my header */
  319         bzero(&fakept, sizeof(fakept));
  320         bcopy(&mdhdr, &fakept, sizeof(mdhdr));
  321         error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
  322         if (error)
  323                 goto fail;
  324 
  325         /* Dump msgbuf up front */
  326         error = blk_write(di, (char *)msgbufp->msg_ptr, 0, round_page(msgbufp->msg_size));
  327         if (error)
  328                 goto fail;
  329 
  330         /* Dump bitmap */
  331         error = blk_write(di, (char *)vm_page_dump, 0,
  332             round_page(vm_page_dump_size));
  333         if (error)
  334                 goto fail;
  335 
  336         /* Dump kernel page table pages */
  337         for (va = KERNBASE; va < kernel_vm_end; va += NBPDR) {
  338                 /* We always write a page, even if it is zero */
  339                 pmap_get_pde_pte(pmap_kernel(), va, &pdp, &ptp);
  340 
  341                 if (pmap_pde_v(pdp) && pmap_pde_section(pdp))  {
  342                         if (count) {
  343                                 error = blk_write_cont(di, prev_pa,
  344                                     count * L2_TABLE_SIZE_REAL);
  345                                 if (error)
  346                                         goto fail;
  347                                 count = 0;
  348                                 prev_pa = 0;
  349                         }
  350                         /* This is a single 2M block. Generate a fake PTP */
  351                         pa = (*pdp & L1_S_ADDR_MASK) | (va & ~L1_S_ADDR_MASK);
  352                         for (k = 0; k < (L1_S_SIZE / PAGE_SIZE); k++) {
  353                                 fakept[k] = L2_S_PROTO | (pa + (k * PAGE_SIZE)) |
  354                                     L2_S_PROT(PTE_KERNEL,
  355                                     VM_PROT_READ | VM_PROT_WRITE);
  356                         }
  357                         error = blk_write(di, (char *)&fakept, 0,
  358                             L2_TABLE_SIZE_REAL);
  359                         if (error)
  360                                 goto fail;
  361                         /* Flush, in case we reuse fakept in the same block */
  362                         error = blk_flush(di);
  363                         if (error)
  364                                 goto fail;
  365                         continue;
  366                 }
  367                 if (pmap_pde_v(pdp) && pmap_pde_page(pdp)) {
  368                         pa = *pdp & L1_C_ADDR_MASK;
  369                         if (!count) {
  370                                 prev_pa = pa;
  371                                 count++;
  372                         }
  373                         else {
  374                                 if (pa == (prev_pa + count * L2_TABLE_SIZE_REAL))
  375                                         count++;
  376                                 else {
  377                                         error = blk_write_cont(di, prev_pa,
  378                                             count * L2_TABLE_SIZE_REAL);
  379                                         if (error)
  380                                                 goto fail;
  381                                         count = 1;
  382                                         prev_pa = pa;
  383                                 }
  384                         }
  385                 } else {
  386                         if (count) {
  387                                 error = blk_write_cont(di, prev_pa,
  388                                     count * L2_TABLE_SIZE_REAL);
  389                                 if (error)
  390                                         goto fail;
  391                                 count = 0;
  392                                 prev_pa = 0;
  393                         }
  394                         bzero(fakept, sizeof(fakept));
  395                         error = blk_write(di, (char *)&fakept, 0,
  396                             L2_TABLE_SIZE_REAL);
  397                         if (error)
  398                                 goto fail;
  399                         /* Flush, in case we reuse fakept in the same block */
  400                         error = blk_flush(di);
  401                         if (error)
  402                                 goto fail;
  403                 }
  404         }
  405 
  406         if (count) {
  407                 error = blk_write_cont(di, prev_pa, count * L2_TABLE_SIZE_REAL);
  408                 if (error)
  409                         goto fail;
  410                 count = 0;
  411                 prev_pa = 0;
  412         }
  413 
  414         /* Dump memory chunks */
  415         for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
  416                 bits = vm_page_dump[i];
  417                 while (bits) {
  418                         bit = ffs(bits) - 1;
  419                         pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
  420                             bit) * PAGE_SIZE;
  421                         if (!count) {
  422                                 prev_pa = pa;
  423                                 count++;
  424                         } else {
  425                                 if (pa == (prev_pa + count * PAGE_SIZE))
  426                                         count++;
  427                                 else {
  428                                         error = blk_write_cont(di, prev_pa,
  429                                             count * PAGE_SIZE);
  430                                         if (error)
  431                                                 goto fail;
  432                                         count = 1;
  433                                         prev_pa = pa;
  434                                 }
  435                         }
  436                         bits &= ~(1ul << bit);
  437                 }
  438         }
  439         if (count) {
  440                 error = blk_write_cont(di, prev_pa, count * PAGE_SIZE);
  441                 if (error)
  442                         goto fail;
  443                 count = 0;
  444                 prev_pa = 0;
  445         }
  446 
  447         /* Dump trailer */
  448         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  449         if (error)
  450                 goto fail;
  451         dumplo += sizeof(kdh);
  452 
  453         /* Signal completion, signoff and exit stage left. */
  454         dump_write(di, NULL, 0, 0, 0);
  455         printf("\nDump complete\n");
  456         return;
  457 
  458 fail:
  459         if (error < 0)
  460                 error = -error;
  461 
  462         if (error == ECANCELED)
  463                 printf("\nDump aborted\n");
  464         else if (error == ENOSPC)
  465                 printf("\nDump failed. Partition too small.\n");
  466         else
  467                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  468 }
  469 
  470 void
  471 dump_add_page(vm_paddr_t pa)
  472 {
  473         int idx, bit;
  474 
  475         pa >>= PAGE_SHIFT;
  476         idx = pa >> 5;          /* 2^5 = 32 */
  477         bit = pa & 31;
  478         atomic_set_int(&vm_page_dump[idx], 1ul << bit);
  479 }
  480 
  481 void
  482 dump_drop_page(vm_paddr_t pa)
  483 {
  484         int idx, bit;
  485 
  486         pa >>= PAGE_SHIFT;
  487         idx = pa >> 5;          /* 2^5 = 32 */
  488         bit = pa & 31;
  489         atomic_clear_int(&vm_page_dump[idx], 1ul << bit);
  490 }
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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
