1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __PERF_DSO 3 #define __PERF_DSO 4 5 #include <linux/refcount.h> 6 #include <linux/types.h> 7 #include <linux/rbtree.h> 8 #include <sys/types.h> 9 #include <stdbool.h> 10 #include <stdio.h> 11 #include <linux/bitops.h> 12 #include "build-id.h" 13 #include "mutex.h" 14 15 struct machine; 16 struct map; 17 struct perf_env; 18 19 #define DSO__NAME_KALLSYMS "[kernel.kallsyms]" 20 #define DSO__NAME_KCORE "[kernel.kcore]" 21 22 enum dso_binary_type { 23 DSO_BINARY_TYPE__KALLSYMS = 0, 24 DSO_BINARY_TYPE__GUEST_KALLSYMS, 25 DSO_BINARY_TYPE__VMLINUX, 26 DSO_BINARY_TYPE__GUEST_VMLINUX, 27 DSO_BINARY_TYPE__JAVA_JIT, 28 DSO_BINARY_TYPE__DEBUGLINK, 29 DSO_BINARY_TYPE__BUILD_ID_CACHE, 30 DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO, 31 DSO_BINARY_TYPE__FEDORA_DEBUGINFO, 32 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO, 33 DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO, 34 DSO_BINARY_TYPE__BUILDID_DEBUGINFO, 35 DSO_BINARY_TYPE__SYSTEM_PATH_DSO, 36 DSO_BINARY_TYPE__GUEST_KMODULE, 37 DSO_BINARY_TYPE__GUEST_KMODULE_COMP, 38 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE, 39 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP, 40 DSO_BINARY_TYPE__KCORE, 41 DSO_BINARY_TYPE__GUEST_KCORE, 42 DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO, 43 DSO_BINARY_TYPE__BPF_PROG_INFO, 44 DSO_BINARY_TYPE__BPF_IMAGE, 45 DSO_BINARY_TYPE__OOL, 46 DSO_BINARY_TYPE__NOT_FOUND, 47 }; 48 49 enum dso_space_type { 50 DSO_SPACE__USER = 0, 51 DSO_SPACE__KERNEL, 52 DSO_SPACE__KERNEL_GUEST 53 }; 54 55 enum dso_swap_type { 56 DSO_SWAP__UNSET, 57 DSO_SWAP__NO, 58 DSO_SWAP__YES, 59 }; 60 61 enum dso_data_status { 62 DSO_DATA_STATUS_ERROR = -1, 63 DSO_DATA_STATUS_UNKNOWN = 0, 64 DSO_DATA_STATUS_OK = 1, 65 }; 66 67 enum dso_data_status_seen { 68 DSO_DATA_STATUS_SEEN_ITRACE, 69 }; 70 71 enum dso_type { 72 DSO__TYPE_UNKNOWN, 73 DSO__TYPE_64BIT, 74 DSO__TYPE_32BIT, 75 DSO__TYPE_X32BIT, 76 }; 77 78 enum dso_load_errno { 79 DSO_LOAD_ERRNO__SUCCESS = 0, 80 81 /* 82 * Choose an arbitrary negative big number not to clash with standard 83 * errno since SUS requires the errno has distinct positive values. 84 * See 'Issue 6' in the link below. 85 * 86 * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html 87 */ 88 __DSO_LOAD_ERRNO__START = -10000, 89 90 DSO_LOAD_ERRNO__INTERNAL_ERROR = __DSO_LOAD_ERRNO__START, 91 92 /* for symsrc__init() */ 93 DSO_LOAD_ERRNO__INVALID_ELF, 94 DSO_LOAD_ERRNO__CANNOT_READ_BUILDID, 95 DSO_LOAD_ERRNO__MISMATCHING_BUILDID, 96 97 /* for decompress_kmodule */ 98 DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE, 99 100 __DSO_LOAD_ERRNO__END, 101 }; 102 103 #define DSO__SWAP(dso, type, val) \ 104 ({ \ 105 type ____r = val; \ 106 BUG_ON(dso->needs_swap == DSO_SWAP__UNSET); \ 107 if (dso->needs_swap == DSO_SWAP__YES) { \ 108 switch (sizeof(____r)) { \ 109 case 2: \ 110 ____r = bswap_16(val); \ 111 break; \ 112 case 4: \ 113 ____r = bswap_32(val); \ 114 break; \ 115 case 8: \ 116 ____r = bswap_64(val); \ 117 break; \ 118 default: \ 119 BUG_ON(1); \ 120 } \ 121 } \ 122 ____r; \ 123 }) 124 125 #define DSO__DATA_CACHE_SIZE 4096 126 #define DSO__DATA_CACHE_MASK ~(DSO__DATA_CACHE_SIZE - 1) 127 128 /* 129 * Data about backing storage DSO, comes from PERF_RECORD_MMAP2 meta events 130 */ 131 struct dso_id { 132 u32 maj; 133 u32 min; 134 u64 ino; 135 u64 ino_generation; 136 }; 137 138 struct dso_cache { 139 struct rb_node rb_node; 140 u64 offset; 141 u64 size; 142 char data[]; 143 }; 144 145 struct auxtrace_cache; 146 147 struct dso { 148 struct mutex lock; 149 struct list_head node; 150 struct rb_node rb_node; /* rbtree node sorted by long name */ 151 struct rb_root *root; /* root of rbtree that rb_node is in */ 152 struct rb_root_cached symbols; 153 struct rb_root_cached symbol_names; 154 struct rb_root_cached inlined_nodes; 155 struct rb_root_cached srclines; 156 struct { 157 u64 addr; 158 struct symbol *symbol; 159 } last_find_result; 160 void *a2l; 161 char *symsrc_filename; 162 unsigned int a2l_fails; 163 enum dso_space_type kernel; 164 enum dso_swap_type needs_swap; 165 enum dso_binary_type symtab_type; 166 enum dso_binary_type binary_type; 167 enum dso_load_errno load_errno; 168 u8 adjust_symbols:1; 169 u8 has_build_id:1; 170 u8 header_build_id:1; 171 u8 has_srcline:1; 172 u8 hit:1; 173 u8 annotate_warned:1; 174 u8 auxtrace_warned:1; 175 u8 short_name_allocated:1; 176 u8 long_name_allocated:1; 177 u8 is_64_bit:1; 178 bool sorted_by_name; 179 bool loaded; 180 u8 rel; 181 struct build_id bid; 182 u64 text_offset; 183 const char *short_name; 184 const char *long_name; 185 u16 long_name_len; 186 u16 short_name_len; 187 void *dwfl; /* DWARF debug info */ 188 struct auxtrace_cache *auxtrace_cache; 189 int comp; 190 191 /* dso data file */ 192 struct { 193 struct rb_root cache; 194 int fd; 195 int status; 196 u32 status_seen; 197 u64 file_size; 198 struct list_head open_entry; 199 u64 elf_base_addr; 200 u64 debug_frame_offset; 201 u64 eh_frame_hdr_addr; 202 u64 eh_frame_hdr_offset; 203 } data; 204 /* bpf prog information */ 205 struct { 206 u32 id; 207 u32 sub_id; 208 struct perf_env *env; 209 } bpf_prog; 210 211 union { /* Tool specific area */ 212 void *priv; 213 u64 db_id; 214 }; 215 struct nsinfo *nsinfo; 216 struct dso_id id; 217 refcount_t refcnt; 218 char name[]; 219 }; 220 221 /* dso__for_each_symbol - iterate over the symbols of given type 222 * 223 * @dso: the 'struct dso *' in which symbols are iterated 224 * @pos: the 'struct symbol *' to use as a loop cursor 225 * @n: the 'struct rb_node *' to use as a temporary storage 226 */ 227 #define dso__for_each_symbol(dso, pos, n) \ 228 symbols__for_each_entry(&(dso)->symbols, pos, n) 229 230 #define dsos__for_each_with_build_id(pos, head) \ 231 list_for_each_entry(pos, head, node) \ 232 if (!pos->has_build_id) \ 233 continue; \ 234 else 235 dso__set_loaded(struct dso * dso)236 static inline void dso__set_loaded(struct dso *dso) 237 { 238 dso->loaded = true; 239 } 240 241 struct dso *dso__new_id(const char *name, struct dso_id *id); 242 struct dso *dso__new(const char *name); 243 void dso__delete(struct dso *dso); 244 245 int dso__cmp_id(struct dso *a, struct dso *b); 246 void dso__set_short_name(struct dso *dso, const char *name, bool name_allocated); 247 void dso__set_long_name(struct dso *dso, const char *name, bool name_allocated); 248 249 int dso__name_len(const struct dso *dso); 250 251 struct dso *dso__get(struct dso *dso); 252 void dso__put(struct dso *dso); 253 __dso__zput(struct dso ** dso)254 static inline void __dso__zput(struct dso **dso) 255 { 256 dso__put(*dso); 257 *dso = NULL; 258 } 259 260 #define dso__zput(dso) __dso__zput(&dso) 261 262 bool dso__loaded(const struct dso *dso); 263 dso__has_symbols(const struct dso * dso)264 static inline bool dso__has_symbols(const struct dso *dso) 265 { 266 return !RB_EMPTY_ROOT(&dso->symbols.rb_root); 267 } 268 269 bool dso__sorted_by_name(const struct dso *dso); 270 void dso__set_sorted_by_name(struct dso *dso); 271 void dso__sort_by_name(struct dso *dso); 272 273 void dso__set_build_id(struct dso *dso, struct build_id *bid); 274 bool dso__build_id_equal(const struct dso *dso, struct build_id *bid); 275 void dso__read_running_kernel_build_id(struct dso *dso, 276 struct machine *machine); 277 int dso__kernel_module_get_build_id(struct dso *dso, const char *root_dir); 278 279 char dso__symtab_origin(const struct dso *dso); 280 int dso__read_binary_type_filename(const struct dso *dso, enum dso_binary_type type, 281 char *root_dir, char *filename, size_t size); 282 bool is_kernel_module(const char *pathname, int cpumode); 283 bool dso__needs_decompress(struct dso *dso); 284 int dso__decompress_kmodule_fd(struct dso *dso, const char *name); 285 int dso__decompress_kmodule_path(struct dso *dso, const char *name, 286 char *pathname, size_t len); 287 int filename__decompress(const char *name, char *pathname, 288 size_t len, int comp, int *err); 289 290 #define KMOD_DECOMP_NAME "/tmp/perf-kmod-XXXXXX" 291 #define KMOD_DECOMP_LEN sizeof(KMOD_DECOMP_NAME) 292 293 struct kmod_path { 294 char *name; 295 int comp; 296 bool kmod; 297 }; 298 299 int __kmod_path__parse(struct kmod_path *m, const char *path, 300 bool alloc_name); 301 302 #define kmod_path__parse(__m, __p) __kmod_path__parse(__m, __p, false) 303 #define kmod_path__parse_name(__m, __p) __kmod_path__parse(__m, __p, true) 304 305 void dso__set_module_info(struct dso *dso, struct kmod_path *m, 306 struct machine *machine); 307 308 /* 309 * The dso__data_* external interface provides following functions: 310 * dso__data_get_fd 311 * dso__data_put_fd 312 * dso__data_close 313 * dso__data_size 314 * dso__data_read_offset 315 * dso__data_read_addr 316 * dso__data_write_cache_offs 317 * dso__data_write_cache_addr 318 * 319 * Please refer to the dso.c object code for each function and 320 * arguments documentation. Following text tries to explain the 321 * dso file descriptor caching. 322 * 323 * The dso__data* interface allows caching of opened file descriptors 324 * to speed up the dso data accesses. The idea is to leave the file 325 * descriptor opened ideally for the whole life of the dso object. 326 * 327 * The current usage of the dso__data_* interface is as follows: 328 * 329 * Get DSO's fd: 330 * int fd = dso__data_get_fd(dso, machine); 331 * if (fd >= 0) { 332 * USE 'fd' SOMEHOW 333 * dso__data_put_fd(dso); 334 * } 335 * 336 * Read DSO's data: 337 * n = dso__data_read_offset(dso_0, &machine, 0, buf, BUFSIZE); 338 * n = dso__data_read_addr(dso_0, &machine, 0, buf, BUFSIZE); 339 * 340 * Eventually close DSO's fd: 341 * dso__data_close(dso); 342 * 343 * It is not necessary to close the DSO object data file. Each time new 344 * DSO data file is opened, the limit (RLIMIT_NOFILE/2) is checked. Once 345 * it is crossed, the oldest opened DSO object is closed. 346 * 347 * The dso__delete function calls close_dso function to ensure the 348 * data file descriptor gets closed/unmapped before the dso object 349 * is freed. 350 * 351 * TODO 352 */ 353 int dso__data_get_fd(struct dso *dso, struct machine *machine); 354 void dso__data_put_fd(struct dso *dso); 355 void dso__data_close(struct dso *dso); 356 357 int dso__data_file_size(struct dso *dso, struct machine *machine); 358 off_t dso__data_size(struct dso *dso, struct machine *machine); 359 ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine, 360 u64 offset, u8 *data, ssize_t size); 361 ssize_t dso__data_read_addr(struct dso *dso, struct map *map, 362 struct machine *machine, u64 addr, 363 u8 *data, ssize_t size); 364 bool dso__data_status_seen(struct dso *dso, enum dso_data_status_seen by); 365 ssize_t dso__data_write_cache_offs(struct dso *dso, struct machine *machine, 366 u64 offset, const u8 *data, ssize_t size); 367 ssize_t dso__data_write_cache_addr(struct dso *dso, struct map *map, 368 struct machine *machine, u64 addr, 369 const u8 *data, ssize_t size); 370 371 struct map *dso__new_map(const char *name); 372 struct dso *machine__findnew_kernel(struct machine *machine, const char *name, 373 const char *short_name, int dso_type); 374 375 void dso__reset_find_symbol_cache(struct dso *dso); 376 377 size_t dso__fprintf_symbols_by_name(struct dso *dso, FILE *fp); 378 size_t dso__fprintf(struct dso *dso, FILE *fp); 379 dso__is_vmlinux(struct dso * dso)380 static inline bool dso__is_vmlinux(struct dso *dso) 381 { 382 return dso->binary_type == DSO_BINARY_TYPE__VMLINUX || 383 dso->binary_type == DSO_BINARY_TYPE__GUEST_VMLINUX; 384 } 385 dso__is_kcore(struct dso * dso)386 static inline bool dso__is_kcore(struct dso *dso) 387 { 388 return dso->binary_type == DSO_BINARY_TYPE__KCORE || 389 dso->binary_type == DSO_BINARY_TYPE__GUEST_KCORE; 390 } 391 dso__is_kallsyms(struct dso * dso)392 static inline bool dso__is_kallsyms(struct dso *dso) 393 { 394 return dso->kernel && dso->long_name[0] != '/'; 395 } 396 397 void dso__free_a2l(struct dso *dso); 398 399 enum dso_type dso__type(struct dso *dso, struct machine *machine); 400 401 int dso__strerror_load(struct dso *dso, char *buf, size_t buflen); 402 403 void reset_fd_limit(void); 404 405 #endif /* __PERF_DSO */ 406