tools/perf/util/pmu.c

   1
   2 #include <linux/list.h>
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <unistd.h>
   6 #include <stdio.h>
   7 #include <dirent.h>
   8 #include "sysfs.h"
   9 #include "util.h"
  10 #include "pmu.h"
  11 #include "parse-events.h"
  12 #include "cpumap.h"
  13
  14 #define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
  15
  16 int perf_pmu_parse(struct list_head *list, char *name);
  17 extern FILE *perf_pmu_in;
  18
  19 static LIST_HEAD(pmus);
  20
  21 /*
  22  * Parse & process all the sysfs attributes located under
  23  * the directory specified in 'dir' parameter.
  24  */
  25 int perf_pmu__format_parse(char *dir, struct list_head *head)
  26 {
  27         struct dirent *evt_ent;
  28         DIR *format_dir;
  29         int ret = 0;
  30
  31         format_dir = opendir(dir);
  32         if (!format_dir)
  33                 return -EINVAL;
  34
  35         while (!ret && (evt_ent = readdir(format_dir))) {
  36                 char path[PATH_MAX];
  37                 char *name = evt_ent->d_name;
  38                 FILE *file;
  39
  40                 if (!strcmp(name, ".") || !strcmp(name, ".."))
  41                         continue;
  42
  43                 snprintf(path, PATH_MAX, "%s/%s", dir, name);
  44
  45                 ret = -EINVAL;
  46                 file = fopen(path, "r");
  47                 if (!file)
  48                         break;
  49
  50                 perf_pmu_in = file;
  51                 ret = perf_pmu_parse(head, name);
  52                 fclose(file);
  53         }
  54
  55         closedir(format_dir);
  56         return ret;
  57 }
  58
  59 /*
  60  * Reading/parsing the default pmu format definition, which should be
  61  * located at:
  62  * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
  63  */
  64 static int pmu_format(char *name, struct list_head *format)
  65 {
  66         struct stat st;
  67         char path[PATH_MAX];
  68         const char *sysfs;
  69
  70         sysfs = sysfs_find_mountpoint();
  71         if (!sysfs)
  72                 return -1;
  73
  74         snprintf(path, PATH_MAX,
  75                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);
  76
  77         if (stat(path, &st) < 0)
  78                 return 0;       /* no error if format does not exist */
  79
  80         if (perf_pmu__format_parse(path, format))
  81                 return -1;
  82
  83         return 0;
  84 }
  85
  86 static int perf_pmu__new_alias(struct list_head *list, char *name, FILE *file)
  87 {
  88         struct perf_pmu__alias *alias;
  89         char buf[256];
  90         int ret;
  91
  92         ret = fread(buf, 1, sizeof(buf), file);
  93         if (ret == 0)
  94                 return -EINVAL;
  95         buf[ret] = 0;
  96
  97         alias = malloc(sizeof(*alias));
  98         if (!alias)
  99                 return -ENOMEM;
 100
 101         INIT_LIST_HEAD(&alias->terms);
 102         ret = parse_events_terms(&alias->terms, buf);
 103         if (ret) {
 104                 free(alias);
 105                 return ret;
 106         }
 107
 108         alias->name = strdup(name);
 109         list_add_tail(&alias->list, list);
 110         return 0;
 111 }
 112
 113 /*
 114  * Process all the sysfs attributes located under the directory
 115  * specified in 'dir' parameter.
 116  */
 117 static int pmu_aliases_parse(char *dir, struct list_head *head)
 118 {
 119         struct dirent *evt_ent;
 120         DIR *event_dir;
 121         int ret = 0;
 122
 123         event_dir = opendir(dir);
 124         if (!event_dir)
 125                 return -EINVAL;
 126
 127         while (!ret && (evt_ent = readdir(event_dir))) {
 128                 char path[PATH_MAX];
 129                 char *name = evt_ent->d_name;
 130                 FILE *file;
 131
 132                 if (!strcmp(name, ".") || !strcmp(name, ".."))
 133                         continue;
 134
 135                 snprintf(path, PATH_MAX, "%s/%s", dir, name);
 136
 137                 ret = -EINVAL;
 138                 file = fopen(path, "r");
 139                 if (!file)
 140                         break;
 141                 ret = perf_pmu__new_alias(head, name, file);
 142                 fclose(file);
 143         }
 144
 145         closedir(event_dir);
 146         return ret;
 147 }
 148
 149 /*
 150  * Reading the pmu event aliases definition, which should be located at:
 151  * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
 152  */
 153 static int pmu_aliases(char *name, struct list_head *head)
 154 {
 155         struct stat st;
 156         char path[PATH_MAX];
 157         const char *sysfs;
 158
 159         sysfs = sysfs_find_mountpoint();
 160         if (!sysfs)
 161                 return -1;
 162
 163         snprintf(path, PATH_MAX,
 164                  "%s/bus/event_source/devices/%s/events", sysfs, name);
 165
 166         if (stat(path, &st) < 0)
 167                 return 0;        /* no error if 'events' does not exist */
 168
 169         if (pmu_aliases_parse(path, head))
 170                 return -1;
 171
 172         return 0;
 173 }
 174
 175 static int pmu_alias_terms(struct perf_pmu__alias *alias,
 176                            struct list_head *terms)
 177 {
 178         struct parse_events__term *term, *clone;
 179         LIST_HEAD(list);
 180         int ret;
 181
 182         list_for_each_entry(term, &alias->terms, list) {
 183                 ret = parse_events__term_clone(&clone, term);
 184                 if (ret) {
 185                         parse_events__free_terms(&list);
 186                         return ret;
 187                 }
 188                 list_add_tail(&clone->list, &list);
 189         }
 190         list_splice(&list, terms);
 191         return 0;
 192 }
 193
 194 /*
 195  * Reading/parsing the default pmu type value, which should be
 196  * located at:
 197  * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
 198  */
 199 static int pmu_type(char *name, __u32 *type)
 200 {
 201         struct stat st;
 202         char path[PATH_MAX];
 203         const char *sysfs;
 204         FILE *file;
 205         int ret = 0;
 206
 207         sysfs = sysfs_find_mountpoint();
 208         if (!sysfs)
 209                 return -1;
 210
 211         snprintf(path, PATH_MAX,
 212                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
 213
 214         if (stat(path, &st) < 0)
 215                 return -1;
 216
 217         file = fopen(path, "r");
 218         if (!file)
 219                 return -EINVAL;
 220
 221         if (1 != fscanf(file, "%u", type))
 222                 ret = -1;
 223
 224         fclose(file);
 225         return ret;
 226 }
 227
 228 /* Add all pmus in sysfs to pmu list: */
 229 static void pmu_read_sysfs(void)
 230 {
 231         char path[PATH_MAX];
 232         const char *sysfs;
 233         DIR *dir;
 234         struct dirent *dent;
 235
 236         sysfs = sysfs_find_mountpoint();
 237         if (!sysfs)
 238                 return;
 239
 240         snprintf(path, PATH_MAX,
 241                  "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
 242
 243         dir = opendir(path);
 244         if (!dir)
 245                 return;
 246
 247         while ((dent = readdir(dir))) {
 248                 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
 249                         continue;
 250                 /* add to static LIST_HEAD(pmus): */
 251                 perf_pmu__find(dent->d_name);
 252         }
 253
 254         closedir(dir);
 255 }
 256
 257 static struct cpu_map *pmu_cpumask(char *name)
 258 {
 259         struct stat st;
 260         char path[PATH_MAX];
 261         const char *sysfs;
 262         FILE *file;
 263         struct cpu_map *cpus;
 264
 265         sysfs = sysfs_find_mountpoint();
 266         if (!sysfs)
 267                 return NULL;
 268
 269         snprintf(path, PATH_MAX,
 270                  "%s/bus/event_source/devices/%s/cpumask", sysfs, name);
 271
 272         if (stat(path, &st) < 0)
 273                 return NULL;
 274
 275         file = fopen(path, "r");
 276         if (!file)
 277                 return NULL;
 278
 279         cpus = cpu_map__read(file);
 280         fclose(file);
 281         return cpus;
 282 }
 283
 284 static struct perf_pmu *pmu_lookup(char *name)
 285 {
 286         struct perf_pmu *pmu;
 287         LIST_HEAD(format);
 288         LIST_HEAD(aliases);
 289         __u32 type;
 290
 291         /*
 292          * The pmu data we store & need consists of the pmu
 293          * type value and format definitions. Load both right
 294          * now.
 295          */
 296         if (pmu_format(name, &format))
 297                 return NULL;
 298
 299         if (pmu_aliases(name, &aliases))
 300                 return NULL;
 301
 302         if (pmu_type(name, &type))
 303                 return NULL;
 304
 305         pmu = zalloc(sizeof(*pmu));
 306         if (!pmu)
 307                 return NULL;
 308
 309         pmu->cpus = pmu_cpumask(name);
 310
 311         INIT_LIST_HEAD(&pmu->format);
 312         INIT_LIST_HEAD(&pmu->aliases);
 313         list_splice(&format, &pmu->format);
 314         list_splice(&aliases, &pmu->aliases);
 315         pmu->name = strdup(name);
 316         pmu->type = type;
 317         list_add_tail(&pmu->list, &pmus);
 318         return pmu;
 319 }
 320
 321 static struct perf_pmu *pmu_find(char *name)
 322 {
 323         struct perf_pmu *pmu;
 324
 325         list_for_each_entry(pmu, &pmus, list)
 326                 if (!strcmp(pmu->name, name))
 327                         return pmu;
 328
 329         return NULL;
 330 }
 331
 332 struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
 333 {
 334         /*
 335          * pmu iterator: If pmu is NULL, we start at the begin,
 336          * otherwise return the next pmu. Returns NULL on end.
 337          */
 338         if (!pmu) {
 339                 pmu_read_sysfs();
 340                 pmu = list_prepare_entry(pmu, &pmus, list);
 341         }
 342         list_for_each_entry_continue(pmu, &pmus, list)
 343                 return pmu;
 344         return NULL;
 345 }
 346
 347 struct perf_pmu *perf_pmu__find(char *name)
 348 {
 349         struct perf_pmu *pmu;
 350
 351         /*
 352          * Once PMU is loaded it stays in the list,
 353          * so we keep us from multiple reading/parsing
 354          * the pmu format definitions.
 355          */
 356         pmu = pmu_find(name);
 357         if (pmu)
 358                 return pmu;
 359
 360         return pmu_lookup(name);
 361 }
 362
 363 static struct perf_pmu__format*
 364 pmu_find_format(struct list_head *formats, char *name)
 365 {
 366         struct perf_pmu__format *format;
 367
 368         list_for_each_entry(format, formats, list)
 369                 if (!strcmp(format->name, name))
 370                         return format;
 371
 372         return NULL;
 373 }
 374
 375 /*
 376  * Returns value based on the format definition (format parameter)
 377  * and unformated value (value parameter).
 378  *
 379  * TODO maybe optimize a little ;)
 380  */
 381 static __u64 pmu_format_value(unsigned long *format, __u64 value)
 382 {
 383         unsigned long fbit, vbit;
 384         __u64 v = 0;
 385
 386         for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
 387
 388                 if (!test_bit(fbit, format))
 389                         continue;
 390
 391                 if (!(value & (1llu << vbit++)))
 392                         continue;
 393
 394                 v |= (1llu << fbit);
 395         }
 396
 397         return v;
 398 }
 399
 400 /*
 401  * Setup one of config[12] attr members based on the
 402  * user input data - temr parameter.
 403  */
 404 static int pmu_config_term(struct list_head *formats,
 405                            struct perf_event_attr *attr,
 406                            struct parse_events__term *term)
 407 {
 408         struct perf_pmu__format *format;
 409         __u64 *vp;
 410
 411         /*
 412          * Support only for hardcoded and numnerial terms.
 413          * Hardcoded terms should be already in, so nothing
 414          * to be done for them.
 415          */
 416         if (parse_events__is_hardcoded_term(term))
 417                 return 0;
 418
 419         if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM)
 420                 return -EINVAL;
 421
 422         format = pmu_find_format(formats, term->config);
 423         if (!format)
 424                 return -EINVAL;
 425
 426         switch (format->value) {
 427         case PERF_PMU_FORMAT_VALUE_CONFIG:
 428                 vp = &attr->config;
 429                 break;
 430         case PERF_PMU_FORMAT_VALUE_CONFIG1:
 431                 vp = &attr->config1;
 432                 break;
 433         case PERF_PMU_FORMAT_VALUE_CONFIG2:
 434                 vp = &attr->config2;
 435                 break;
 436         default:
 437                 return -EINVAL;
 438         }
 439
 440         /*
 441          * XXX If we ever decide to go with string values for
 442          * non-hardcoded terms, here's the place to translate
 443          * them into value.
 444          */
 445         *vp |= pmu_format_value(format->bits, term->val.num);
 446         return 0;
 447 }
 448
 449 int perf_pmu__config_terms(struct list_head *formats,
 450                            struct perf_event_attr *attr,
 451                            struct list_head *head_terms)
 452 {
 453         struct parse_events__term *term;
 454
 455         list_for_each_entry(term, head_terms, list)
 456                 if (pmu_config_term(formats, attr, term))
 457                         return -EINVAL;
 458
 459         return 0;
 460 }
 461
 462 /*
 463  * Configures event's 'attr' parameter based on the:
 464  * 1) users input - specified in terms parameter
 465  * 2) pmu format definitions - specified by pmu parameter
 466  */
 467 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
 468                      struct list_head *head_terms)
 469 {
 470         attr->type = pmu->type;
 471         return perf_pmu__config_terms(&pmu->format, attr, head_terms);
 472 }
 473
 474 static struct perf_pmu__alias *pmu_find_alias(struct perf_pmu *pmu,
 475                                               struct parse_events__term *term)
 476 {
 477         struct perf_pmu__alias *alias;
 478         char *name;
 479
 480         if (parse_events__is_hardcoded_term(term))
 481                 return NULL;
 482
 483         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
 484                 if (term->val.num != 1)
 485                         return NULL;
 486                 if (pmu_find_format(&pmu->format, term->config))
 487                         return NULL;
 488                 name = term->config;
 489         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
 490                 if (strcasecmp(term->config, "event"))
 491                         return NULL;
 492                 name = term->val.str;
 493         } else {
 494                 return NULL;
 495         }
 496
 497         list_for_each_entry(alias, &pmu->aliases, list) {
 498                 if (!strcasecmp(alias->name, name))
 499                         return alias;
 500         }
 501         return NULL;
 502 }
 503
 504 /*
 505  * Find alias in the terms list and replace it with the terms
 506  * defined for the alias
 507  */
 508 int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms)
 509 {
 510         struct parse_events__term *term, *h;
 511         struct perf_pmu__alias *alias;
 512         int ret;
 513
 514         list_for_each_entry_safe(term, h, head_terms, list) {
 515                 alias = pmu_find_alias(pmu, term);
 516                 if (!alias)
 517                         continue;
 518                 ret = pmu_alias_terms(alias, &term->list);
 519                 if (ret)
 520                         return ret;
 521                 list_del(&term->list);
 522                 free(term);
 523         }
 524         return 0;
 525 }
 526
 527 int perf_pmu__new_format(struct list_head *list, char *name,
 528                          int config, unsigned long *bits)
 529 {
 530         struct perf_pmu__format *format;
 531
 532         format = zalloc(sizeof(*format));
 533         if (!format)
 534                 return -ENOMEM;
 535
 536         format->name = strdup(name);
 537         format->value = config;
 538         memcpy(format->bits, bits, sizeof(format->bits));
 539
 540         list_add_tail(&format->list, list);
 541         return 0;
 542 }
 543
 544 void perf_pmu__set_format(unsigned long *bits, long from, long to)
 545 {
 546         long b;
 547
 548         if (!to)
 549                 to = from;
 550
 551         memset(bits, 0, BITS_TO_LONGS(PERF_PMU_FORMAT_BITS));
 552         for (b = from; b <= to; b++)
 553                 set_bit(b, bits);
 554 }