1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 25 #ifndef _SYS_DUMPHDR_H 26 #define _SYS_DUMPHDR_H 27 28 #include <sys/types.h> 29 #include <sys/param.h> 30 #include <sys/utsname.h> 31 #include <sys/log.h> 32 33 #ifdef __cplusplus 34 extern "C" { 35 #endif 36 37 /* 38 * The dump header describes the contents of a crash dump. Two headers 39 * are written out: one at the beginning of the dump, and the other at 40 * the very end of the dump device. The terminal header is at a known 41 * location (end of device) so we can always find it. The initial header 42 * is redundant, but helps savecore(1M) determine whether the dump has been 43 * overwritten by swap activity. See dumpadm(1M) for dump configuration. 44 */ 45 #define DUMP_MAGIC 0xdefec8edU /* dump magic number */ 46 #define DUMP_VERSION 10 /* version of this dumphdr */ 47 #define DUMP_WORDSIZE (sizeof (long) * NBBY) /* word size (32 or 64) */ 48 #define DUMP_PANICSIZE 200 /* Max panic string copied */ 49 #define DUMP_COMPRESS_RATIO 2 /* conservative; usually 2.5+ */ 50 #define DUMP_OFFSET 65536 /* pad at start/end of dev */ 51 #define DUMP_LOGSIZE (2 * LOG_HIWAT) /* /dev/log message save area */ 52 #define DUMP_ERPTSIZE (P2ROUNDUP( \ 53 (ERPT_DATA_SZ / 2) * \ 54 (ERPT_EVCH_MAX + \ 55 ERPT_MAX_ERRS * ERPT_HIWAT), \ 56 DUMP_OFFSET)) /* ereport save area */ 57 #define DUMP_SUMMARYSIZE (P2ROUNDUP( \ 58 (STACK_BUF_SIZE + \ 59 sizeof (summary_dump_t) + 1024), \ 60 DUMP_OFFSET)) /* summary save area */ 61 62 typedef struct dumphdr { 63 uint32_t dump_magic; /* magic number */ 64 uint32_t dump_version; /* version number */ 65 uint32_t dump_flags; /* flags; see below */ 66 uint32_t dump_wordsize; /* 32 or 64 */ 67 offset_t dump_start; /* starting offset on dump device */ 68 offset_t dump_ksyms; /* offset of compressed symbol table */ 69 offset_t dump_pfn; /* offset of pfn table for all pages */ 70 offset_t dump_map; /* offset of page translation map */ 71 offset_t dump_data; /* offset of actual dump data */ 72 struct utsname dump_utsname; /* copy of utsname structure */ 73 char dump_platform[SYS_NMLN]; /* platform name (uname -i) */ 74 char dump_panicstring[DUMP_PANICSIZE]; /* copy of panicstr */ 75 time_t dump_crashtime; /* time of crash */ 76 long dump_pageshift; /* log2(pagesize) */ 77 long dump_pagesize; /* pagesize */ 78 long dump_hashmask; /* page translation hash mask */ 79 long dump_nvtop; /* number of vtop table entries */ 80 pgcnt_t dump_npages; /* number of data pages */ 81 size_t dump_ksyms_size; /* kernel symbol table size */ 82 size_t dump_ksyms_csize; /* compressed symbol table size */ 83 uint32_t dump_fm_panic; /* initiated from fm subsystems */ 84 char dump_uuid[36 + 1]; /* os image uuid */ 85 } dumphdr_t; 86 87 /* 88 * Values for dump_flags 89 */ 90 #define DF_VALID 0x00000001 /* Dump is valid (savecore clears) */ 91 #define DF_COMPLETE 0x00000002 /* All pages present as configured */ 92 #define DF_LIVE 0x00000004 /* Dump was taken on a live system */ 93 #define DF_COMPRESSED 0x00000008 /* Dump is compressed */ 94 #define DF_KERNEL 0x00010000 /* Contains kernel pages only */ 95 #define DF_ALL 0x00020000 /* Contains all pages */ 96 #define DF_CURPROC 0x00040000 /* Contains kernel + cur proc pages */ 97 #define DF_CONTENT 0xffff0000 /* The set of all dump content flags */ 98 99 /* 100 * Dump translation map hash table entry. 101 */ 102 typedef struct dump_map { 103 offset_t dm_first; 104 offset_t dm_next; 105 offset_t dm_data; 106 struct as *dm_as; 107 uintptr_t dm_va; 108 } dump_map_t; 109 110 /* 111 * Dump translation map hash function. 112 */ 113 #define DUMP_HASH(dhp, as, va) \ 114 ((((uintptr_t)(as) >> 3) + ((va) >> (dhp)->dump_pageshift)) & \ 115 (dhp)->dump_hashmask) 116 117 /* 118 * Encoding of the csize word used to provide meta information 119 * between dumpsys and savecore. 120 * 121 * tag size 122 * 1-4095 1..dump_maxcsize stream block 123 * 0 1..pagesize one lzjb page 124 * 0 0 marks end of data 125 */ 126 typedef uint32_t dumpcsize_t; 127 128 #define DUMP_MAX_TAG (0xfffU) 129 #define DUMP_MAX_CSIZE (0xfffffU) 130 #define DUMP_SET_TAG(w, v) (((w) & DUMP_MAX_CSIZE) | ((v) << 20)) 131 #define DUMP_GET_TAG(w) (((w) >> 20) & DUMP_MAX_TAG) 132 #define DUMP_SET_CSIZE(w, v) \ 133 (((w) & (DUMP_MAX_TAG << 20)) | ((v) & DUMP_MAX_CSIZE)) 134 #define DUMP_GET_CSIZE(w) ((w) & DUMP_MAX_CSIZE) 135 136 typedef struct dumpstreamhdr { 137 char stream_magic[8]; /* "StrmHdr" */ 138 pgcnt_t stream_pagenum; /* starting pfn */ 139 pgcnt_t stream_npages; /* uncompressed size */ 140 } dumpstreamhdr_t; 141 142 #define DUMP_STREAM_MAGIC "StrmHdr" 143 144 /* The number of helpers is limited by the number of stream tags. */ 145 #define DUMP_MAX_NHELPER DUMP_MAX_TAG 146 147 /* 148 * The dump data header is placed after the dumphdr in the compressed 149 * image. It is not needed after savecore runs and the data pages have 150 * been decompressed. 151 */ 152 typedef struct dumpdatahdr { 153 uint32_t dump_datahdr_magic; /* data header presence */ 154 uint32_t dump_datahdr_version; /* data header version */ 155 uint64_t dump_data_csize; /* compressed data size */ 156 uint32_t dump_maxcsize; /* compressed data max block size */ 157 uint32_t dump_maxrange; /* max number of pages per range */ 158 uint16_t dump_nstreams; /* number of compression streams */ 159 uint16_t dump_clevel; /* compression level (0-9) */ 160 uint32_t dump_metrics; /* size of metrics data */ 161 } dumpdatahdr_t; 162 163 #define DUMP_DATAHDR_MAGIC ('d' << 24 | 'h' << 16 | 'd' << 8 | 'r') 164 165 #define DUMP_DATAHDR_VERSION 1 166 #define DUMP_CLEVEL_LZJB 1 /* parallel lzjb compression */ 167 #define DUMP_CLEVEL_BZIP2 2 /* parallel bzip2 level 1 */ 168 169 #ifdef _KERNEL 170 171 extern kmutex_t dump_lock; 172 extern struct vnode *dumpvp; 173 extern u_offset_t dumpvp_size; 174 extern struct dumphdr *dumphdr; 175 extern int dump_conflags; 176 extern char *dumppath; 177 178 extern int dump_timeout; 179 extern int dump_timeleft; 180 extern int dump_ioerr; 181 extern int sync_timeout; 182 extern int sync_timeleft; 183 184 extern int dumpinit(struct vnode *, char *, int); 185 extern void dumpfini(void); 186 extern void dump_resize(void); 187 extern void dump_page(pfn_t); 188 extern void dump_addpage(struct as *, void *, pfn_t); 189 extern void dumpsys(void); 190 extern void dumpsys_helper(void); 191 extern void dumpsys_helper_nw(void); 192 extern void dump_messages(void); 193 extern void dump_ereports(void); 194 extern void dumpvp_write(const void *, size_t); 195 extern int dumpvp_resize(void); 196 extern int dump_plat_addr(void); 197 extern void dump_plat_pfn(void); 198 extern int dump_plat_data(void *); 199 extern int dump_set_uuid(const char *); 200 extern const char *dump_get_uuid(void); 201 202 /* 203 * Define a CPU count threshold that determines when to employ 204 * bzip2. This value is defined per-platform. 205 */ 206 extern uint_t dump_plat_mincpu_default; 207 208 #define DUMP_PLAT_SUN4U_MINCPU 51 209 #define DUMP_PLAT_SUN4U_OPL_MINCPU 8 210 #define DUMP_PLAT_SUN4V_MINCPU 128 211 #define DUMP_PLAT_X86_64_MINCPU 11 212 #define DUMP_PLAT_X86_32_MINCPU 0 213 214 /* 215 * Override the per-platform default by setting this variable with 216 * /etc/system. The value 0 disables parallelism, and the old format 217 * dump is produced. 218 */ 219 extern uint_t dump_plat_mincpu; 220 221 /* 222 * Pages may be stolen at dump time. Prevent the pages from ever being 223 * allocated while dump is running. 224 */ 225 #define IS_DUMP_PAGE(pp) (dump_check_used && dump_test_used((pp)->p_pagenum)) 226 227 extern int dump_test_used(pfn_t); 228 extern int dump_check_used; 229 230 #endif /* _KERNEL */ 231 232 #ifdef __cplusplus 233 } 234 #endif 235 236 #endif /* _SYS_DUMPHDR_H */ 237