tools/perf/util/module.c

   1 #include "util.h"
   2 #include "../perf.h"
   3 #include "string.h"
   4 #include "module.h"
   5
   6 #include <libelf.h>
   7 #include <gelf.h>
   8 #include <elf.h>
   9 #include <dirent.h>
  10 #include <sys/utsname.h>
  11
  12 static unsigned int crc32(const char *p, unsigned int len)
  13 {
  14         int i;
  15         unsigned int crc = 0;
  16
  17         while (len--) {
  18                 crc ^= *p++;
  19                 for (i = 0; i < 8; i++)
  20                         crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);
  21         }
  22         return crc;
  23 }
  24
  25 /* module section methods */
  26
  27 struct sec_dso *sec_dso__new_dso(const char *name)
  28 {
  29         struct sec_dso *self = malloc(sizeof(*self) + strlen(name) + 1);
  30
  31         if (self != NULL) {
  32                 strcpy(self->name, name);
  33                 self->secs = RB_ROOT;
  34                 self->find_section = sec_dso__find_section;
  35         }
  36
  37         return self;
  38 }
  39
  40 static void sec_dso__delete_section(struct section *self)
  41 {
  42         free(((void *)self));
  43 }
  44
  45 void sec_dso__delete_sections(struct sec_dso *self)
  46 {
  47         struct section *pos;
  48         struct rb_node *next = rb_first(&self->secs);
  49
  50         while (next) {
  51                 pos = rb_entry(next, struct section, rb_node);
  52                 next = rb_next(&pos->rb_node);
  53                 rb_erase(&pos->rb_node, &self->secs);
  54                 sec_dso__delete_section(pos);
  55         }
  56 }
  57
  58 void sec_dso__delete_self(struct sec_dso *self)
  59 {
  60         sec_dso__delete_sections(self);
  61         free(self);
  62 }
  63
  64 static void sec_dso__insert_section(struct sec_dso *self, struct section *sec)
  65 {
  66         struct rb_node **p = &self->secs.rb_node;
  67         struct rb_node *parent = NULL;
  68         const u64 hash = sec->hash;
  69         struct section *s;
  70
  71         while (*p != NULL) {
  72                 parent = *p;
  73                 s = rb_entry(parent, struct section, rb_node);
  74                 if (hash < s->hash)
  75                         p = &(*p)->rb_left;
  76                 else
  77                         p = &(*p)->rb_right;
  78         }
  79         rb_link_node(&sec->rb_node, parent, p);
  80         rb_insert_color(&sec->rb_node, &self->secs);
  81 }
  82
  83 struct section *sec_dso__find_section(struct sec_dso *self, const char *name)
  84 {
  85         struct rb_node *n;
  86         u64 hash;
  87         int len;
  88
  89         if (self == NULL)
  90                 return NULL;
  91
  92         len = strlen(name);
  93         hash = crc32(name, len);
  94
  95         n = self->secs.rb_node;
  96
  97         while (n) {
  98                 struct section *s = rb_entry(n, struct section, rb_node);
  99
 100                 if (hash < s->hash)
 101                         n = n->rb_left;
 102                 else if (hash > s->hash)
 103                         n = n->rb_right;
 104                 else {
 105                         if (!strcmp(name, s->name))
 106                                 return s;
 107                         else
 108                                 n = rb_next(&s->rb_node);
 109                 }
 110         }
 111
 112         return NULL;
 113 }
 114
 115 static size_t sec_dso__fprintf_section(struct section *self, FILE *fp)
 116 {
 117         return fprintf(fp, "name:%s vma:%llx path:%s\n",
 118                        self->name, self->vma, self->path);
 119 }
 120
 121 size_t sec_dso__fprintf(struct sec_dso *self, FILE *fp)
 122 {
 123         size_t ret = fprintf(fp, "dso: %s\n", self->name);
 124
 125         struct rb_node *nd;
 126         for (nd = rb_first(&self->secs); nd; nd = rb_next(nd)) {
 127                 struct section *pos = rb_entry(nd, struct section, rb_node);
 128                 ret += sec_dso__fprintf_section(pos, fp);
 129         }
 130
 131         return ret;
 132 }
 133
 134 static struct section *section__new(const char *name, const char *path)
 135 {
 136         struct section *self = calloc(1, sizeof(*self));
 137
 138         if (!self)
 139                 goto out_failure;
 140
 141         self->name = calloc(1, strlen(name) + 1);
 142         if (!self->name)
 143                 goto out_failure;
 144
 145         self->path = calloc(1, strlen(path) + 1);
 146         if (!self->path)
 147                 goto out_failure;
 148
 149         strcpy(self->name, name);
 150         strcpy(self->path, path);
 151         self->hash = crc32(self->name, strlen(name));
 152
 153         return self;
 154
 155 out_failure:
 156         if (self) {
 157                 if (self->name)
 158                         free(self->name);
 159                 if (self->path)
 160                         free(self->path);
 161                 free(self);
 162         }
 163
 164         return NULL;
 165 }
 166
 167 /* module methods */
 168
 169 struct mod_dso *mod_dso__new_dso(const char *name)
 170 {
 171         struct mod_dso *self = malloc(sizeof(*self) + strlen(name) + 1);
 172
 173         if (self != NULL) {
 174                 strcpy(self->name, name);
 175                 self->mods = RB_ROOT;
 176                 self->find_module = mod_dso__find_module;
 177         }
 178
 179         return self;
 180 }
 181
 182 static void mod_dso__delete_module(struct module *self)
 183 {
 184         free(((void *)self));
 185 }
 186
 187 void mod_dso__delete_modules(struct mod_dso *self)
 188 {
 189         struct module *pos;
 190         struct rb_node *next = rb_first(&self->mods);
 191
 192         while (next) {
 193                 pos = rb_entry(next, struct module, rb_node);
 194                 next = rb_next(&pos->rb_node);
 195                 rb_erase(&pos->rb_node, &self->mods);
 196                 mod_dso__delete_module(pos);
 197         }
 198 }
 199
 200 void mod_dso__delete_self(struct mod_dso *self)
 201 {
 202         mod_dso__delete_modules(self);
 203         free(self);
 204 }
 205
 206 static void mod_dso__insert_module(struct mod_dso *self, struct module *mod)
 207 {
 208         struct rb_node **p = &self->mods.rb_node;
 209         struct rb_node *parent = NULL;
 210         const u64 hash = mod->hash;
 211         struct module *m;
 212
 213         while (*p != NULL) {
 214                 parent = *p;
 215                 m = rb_entry(parent, struct module, rb_node);
 216                 if (hash < m->hash)
 217                         p = &(*p)->rb_left;
 218                 else
 219                         p = &(*p)->rb_right;
 220         }
 221         rb_link_node(&mod->rb_node, parent, p);
 222         rb_insert_color(&mod->rb_node, &self->mods);
 223 }
 224
 225 struct module *mod_dso__find_module(struct mod_dso *self, const char *name)
 226 {
 227         struct rb_node *n;
 228         u64 hash;
 229         int len;
 230
 231         if (self == NULL)
 232                 return NULL;
 233
 234         len = strlen(name);
 235         hash = crc32(name, len);
 236
 237         n = self->mods.rb_node;
 238
 239         while (n) {
 240                 struct module *m = rb_entry(n, struct module, rb_node);
 241
 242                 if (hash < m->hash)
 243                         n = n->rb_left;
 244                 else if (hash > m->hash)
 245                         n = n->rb_right;
 246                 else {
 247                         if (!strcmp(name, m->name))
 248                                 return m;
 249                         else
 250                                 n = rb_next(&m->rb_node);
 251                 }
 252         }
 253
 254         return NULL;
 255 }
 256
 257 static size_t mod_dso__fprintf_module(struct module *self, FILE *fp)
 258 {
 259         return fprintf(fp, "name:%s path:%s\n", self->name, self->path);
 260 }
 261
 262 size_t mod_dso__fprintf(struct mod_dso *self, FILE *fp)
 263 {
 264         struct rb_node *nd;
 265         size_t ret;
 266
 267         ret = fprintf(fp, "dso: %s\n", self->name);
 268
 269         for (nd = rb_first(&self->mods); nd; nd = rb_next(nd)) {
 270                 struct module *pos = rb_entry(nd, struct module, rb_node);
 271
 272                 ret += mod_dso__fprintf_module(pos, fp);
 273         }
 274
 275         return ret;
 276 }
 277
 278 static struct module *module__new(const char *name, const char *path)
 279 {
 280         struct module *self = calloc(1, sizeof(*self));
 281
 282         if (!self)
 283                 goto out_failure;
 284
 285         self->name = calloc(1, strlen(name) + 1);
 286         if (!self->name)
 287                 goto out_failure;
 288
 289         self->path = calloc(1, strlen(path) + 1);
 290         if (!self->path)
 291                 goto out_failure;
 292
 293         strcpy(self->name, name);
 294         strcpy(self->path, path);
 295         self->hash = crc32(self->name, strlen(name));
 296
 297         return self;
 298
 299 out_failure:
 300         if (self) {
 301                 if (self->name)
 302                         free(self->name);
 303                 if (self->path)
 304                         free(self->path);
 305                 free(self);
 306         }
 307
 308         return NULL;
 309 }
 310
 311 static int mod_dso__load_sections(struct module *mod)
 312 {
 313         int count = 0, path_len;
 314         struct dirent *entry;
 315         char *line = NULL;
 316         char *dir_path;
 317         DIR *dir;
 318         size_t n;
 319
 320         path_len = strlen("/sys/module/");
 321         path_len += strlen(mod->name);
 322         path_len += strlen("/sections/");
 323
 324         dir_path = calloc(1, path_len + 1);
 325         if (dir_path == NULL)
 326                 goto out_failure;
 327
 328         strcat(dir_path, "/sys/module/");
 329         strcat(dir_path, mod->name);
 330         strcat(dir_path, "/sections/");
 331
 332         dir = opendir(dir_path);
 333         if (dir == NULL)
 334                 goto out_free;
 335
 336         while ((entry = readdir(dir))) {
 337                 struct section *section;
 338                 char *path, *vma;
 339                 int line_len;
 340                 FILE *file;
 341
 342                 if (!strcmp(".", entry->d_name) || !strcmp("..", entry->d_name))
 343                         continue;
 344
 345                 path = calloc(1, path_len + strlen(entry->d_name) + 1);
 346                 if (path == NULL)
 347                         break;
 348                 strcat(path, dir_path);
 349                 strcat(path, entry->d_name);
 350
 351                 file = fopen(path, "r");
 352                 if (file == NULL) {
 353                         free(path);
 354                         break;
 355                 }
 356
 357                 line_len = getline(&line, &n, file);
 358                 if (line_len < 0) {
 359                         free(path);
 360                         fclose(file);
 361                         break;
 362                 }
 363
 364                 if (!line) {
 365                         free(path);
 366                         fclose(file);
 367                         break;
 368                 }
 369
 370                 line[--line_len] = '\0'; /* \n */
 371
 372                 vma = strstr(line, "0x");
 373                 if (!vma) {
 374                         free(path);
 375                         fclose(file);
 376                         break;
 377                 }
 378                 vma += 2;
 379
 380                 section = section__new(entry->d_name, path);
 381                 if (!section) {
 382                         fprintf(stderr, "load_sections: allocation error\n");
 383                         free(path);
 384                         fclose(file);
 385                         break;
 386                 }
 387
 388                 hex2u64(vma, &section->vma);
 389                 sec_dso__insert_section(mod->sections, section);
 390
 391                 free(path);
 392                 fclose(file);
 393                 count++;
 394         }
 395
 396         closedir(dir);
 397         free(line);
 398         free(dir_path);
 399
 400         return count;
 401
 402 out_free:
 403         free(dir_path);
 404
 405 out_failure:
 406         return count;
 407 }
 408
 409 static int mod_dso__load_module_paths(struct mod_dso *self)
 410 {
 411         struct utsname uts;
 412         int count = 0, len;
 413         char *line = NULL;
 414         FILE *file;
 415         char *path;
 416         size_t n;
 417
 418         if (uname(&uts) < 0)
 419                 goto out_failure;
 420
 421         len = strlen("/lib/modules/");
 422         len += strlen(uts.release);
 423         len += strlen("/modules.dep");
 424
 425         path = calloc(1, len + 1);
 426         if (path == NULL)
 427                 goto out_failure;
 428
 429         strcat(path, "/lib/modules/");
 430         strcat(path, uts.release);
 431         strcat(path, "/modules.dep");
 432
 433         file = fopen(path, "r");
 434         free(path);
 435         if (file == NULL)
 436                 goto out_failure;
 437
 438         while (!feof(file)) {
 439                 char *path, *name, *tmp;
 440                 struct module *module;
 441                 int line_len, len;
 442
 443                 line_len = getline(&line, &n, file);
 444                 if (line_len < 0)
 445                         break;
 446
 447                 if (!line)
 448                         goto out_failure;
 449
 450                 line[--line_len] = '\0'; /* \n */
 451
 452                 path = strtok(line, ":");
 453                 if (!path)
 454                         goto out_failure;
 455
 456                 name = strdup(path);
 457                 name = strtok(name, "/");
 458
 459                 tmp = name;
 460
 461                 while (tmp) {
 462                         tmp = strtok(NULL, "/");
 463                         if (tmp)
 464                                 name = tmp;
 465                 }
 466                 name = strsep(&name, ".");
 467
 468                 /* Quirk: replace '-' with '_' in sound modules */
 469                 for (len = strlen(name); len; len--) {
 470                         if (*(name+len) == '-')
 471                                 *(name+len) = '_';
 472                 }
 473
 474                 module = module__new(name, path);
 475                 if (!module) {
 476                         fprintf(stderr, "load_module_paths: allocation error\n");
 477                         goto out_failure;
 478                 }
 479                 mod_dso__insert_module(self, module);
 480
 481                 module->sections = sec_dso__new_dso("sections");
 482                 if (!module->sections) {
 483                         fprintf(stderr, "load_module_paths: allocation error\n");
 484                         goto out_failure;
 485                 }
 486
 487                 module->active = mod_dso__load_sections(module);
 488
 489                 if (module->active > 0)
 490                         count++;
 491         }
 492
 493         free(line);
 494         fclose(file);
 495
 496         return count;
 497
 498 out_failure:
 499         return -1;
 500 }
 501
 502 int mod_dso__load_modules(struct mod_dso *dso)
 503 {
 504         int err;
 505
 506         err = mod_dso__load_module_paths(dso);
 507
 508         return err;
 509 }