tools/perf/util/pmu.c

   1 #include <linux/list.h>
   2 #include <sys/types.h>
   3 #include <sys/stat.h>
   4 #include <unistd.h>
   5 #include <stdio.h>
   6 #include <dirent.h>
   7 #include "sysfs.h"
   8 #include "util.h"
   9 #include "pmu.h"
  10 #include "parse-events.h"
  11 #include "cpumap.h"
  12
  13 struct perf_pmu_alias {
  14         char *name;
  15         struct list_head terms;
  16         struct list_head list;
  17 };
  18
  19 struct perf_pmu_format {
  20         char *name;
  21         int value;
  22         DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
  23         struct list_head list;
  24 };
  25
  26 #define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
  27
  28 int perf_pmu_parse(struct list_head *list, char *name);
  29 extern FILE *perf_pmu_in;
  30
  31 static LIST_HEAD(pmus);
  32
  33 /*
  34  * Parse & process all the sysfs attributes located under
  35  * the directory specified in 'dir' parameter.
  36  */
  37 int perf_pmu__format_parse(char *dir, struct list_head *head)
  38 {
  39         struct dirent *evt_ent;
  40         DIR *format_dir;
  41         int ret = 0;
  42
  43         format_dir = opendir(dir);
  44         if (!format_dir)
  45                 return -EINVAL;
  46
  47         while (!ret && (evt_ent = readdir(format_dir))) {
  48                 char path[PATH_MAX];
  49                 char *name = evt_ent->d_name;
  50                 FILE *file;
  51
  52                 if (!strcmp(name, ".") || !strcmp(name, ".."))
  53                         continue;
  54
  55                 snprintf(path, PATH_MAX, "%s/%s", dir, name);
  56
  57                 ret = -EINVAL;
  58                 file = fopen(path, "r");
  59                 if (!file)
  60                         break;
  61
  62                 perf_pmu_in = file;
  63                 ret = perf_pmu_parse(head, name);
  64                 fclose(file);
  65         }
  66
  67         closedir(format_dir);
  68         return ret;
  69 }
  70
  71 /*
  72  * Reading/parsing the default pmu format definition, which should be
  73  * located at:
  74  * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
  75  */
  76 static int pmu_format(char *name, struct list_head *format)
  77 {
  78         struct stat st;
  79         char path[PATH_MAX];
  80         const char *sysfs;
  81
  82         sysfs = sysfs_find_mountpoint();
  83         if (!sysfs)
  84                 return -1;
  85
  86         snprintf(path, PATH_MAX,
  87                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);
  88
  89         if (stat(path, &st) < 0)
  90                 return 0;       /* no error if format does not exist */
  91
  92         if (perf_pmu__format_parse(path, format))
  93                 return -1;
  94
  95         return 0;
  96 }
  97
  98 static int perf_pmu__new_alias(struct list_head *list, char *name, FILE *file)
  99 {
 100         struct perf_pmu_alias *alias;
 101         char buf[256];
 102         int ret;
 103
 104         ret = fread(buf, 1, sizeof(buf), file);
 105         if (ret == 0)
 106                 return -EINVAL;
 107         buf[ret] = 0;
 108
 109         alias = malloc(sizeof(*alias));
 110         if (!alias)
 111                 return -ENOMEM;
 112
 113         INIT_LIST_HEAD(&alias->terms);
 114         ret = parse_events_terms(&alias->terms, buf);
 115         if (ret) {
 116                 free(alias);
 117                 return ret;
 118         }
 119
 120         alias->name = strdup(name);
 121         list_add_tail(&alias->list, list);
 122         return 0;
 123 }
 124
 125 /*
 126  * Process all the sysfs attributes located under the directory
 127  * specified in 'dir' parameter.
 128  */
 129 static int pmu_aliases_parse(char *dir, struct list_head *head)
 130 {
 131         struct dirent *evt_ent;
 132         DIR *event_dir;
 133         int ret = 0;
 134
 135         event_dir = opendir(dir);
 136         if (!event_dir)
 137                 return -EINVAL;
 138
 139         while (!ret && (evt_ent = readdir(event_dir))) {
 140                 char path[PATH_MAX];
 141                 char *name = evt_ent->d_name;
 142                 FILE *file;
 143
 144                 if (!strcmp(name, ".") || !strcmp(name, ".."))
 145                         continue;
 146
 147                 snprintf(path, PATH_MAX, "%s/%s", dir, name);
 148
 149                 ret = -EINVAL;
 150                 file = fopen(path, "r");
 151                 if (!file)
 152                         break;
 153                 ret = perf_pmu__new_alias(head, name, file);
 154                 fclose(file);
 155         }
 156
 157         closedir(event_dir);
 158         return ret;
 159 }
 160
 161 /*
 162  * Reading the pmu event aliases definition, which should be located at:
 163  * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
 164  */
 165 static int pmu_aliases(char *name, struct list_head *head)
 166 {
 167         struct stat st;
 168         char path[PATH_MAX];
 169         const char *sysfs;
 170
 171         sysfs = sysfs_find_mountpoint();
 172         if (!sysfs)
 173                 return -1;
 174
 175         snprintf(path, PATH_MAX,
 176                  "%s/bus/event_source/devices/%s/events", sysfs, name);
 177
 178         if (stat(path, &st) < 0)
 179                 return 0;        /* no error if 'events' does not exist */
 180
 181         if (pmu_aliases_parse(path, head))
 182                 return -1;
 183
 184         return 0;
 185 }
 186
 187 static int pmu_alias_terms(struct perf_pmu_alias *alias,
 188                            struct list_head *terms)
 189 {
 190         struct parse_events_term *term, *clone;
 191         LIST_HEAD(list);
 192         int ret;
 193
 194         list_for_each_entry(term, &alias->terms, list) {
 195                 ret = parse_events_term__clone(&clone, term);
 196                 if (ret) {
 197                         parse_events__free_terms(&list);
 198                         return ret;
 199                 }
 200                 list_add_tail(&clone->list, &list);
 201         }
 202         list_splice(&list, terms);
 203         return 0;
 204 }
 205
 206 /*
 207  * Reading/parsing the default pmu type value, which should be
 208  * located at:
 209  * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
 210  */
 211 static int pmu_type(char *name, __u32 *type)
 212 {
 213         struct stat st;
 214         char path[PATH_MAX];
 215         const char *sysfs;
 216         FILE *file;
 217         int ret = 0;
 218
 219         sysfs = sysfs_find_mountpoint();
 220         if (!sysfs)
 221                 return -1;
 222
 223         snprintf(path, PATH_MAX,
 224                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
 225
 226         if (stat(path, &st) < 0)
 227                 return -1;
 228
 229         file = fopen(path, "r");
 230         if (!file)
 231                 return -EINVAL;
 232
 233         if (1 != fscanf(file, "%u", type))
 234                 ret = -1;
 235
 236         fclose(file);
 237         return ret;
 238 }
 239
 240 /* Add all pmus in sysfs to pmu list: */
 241 static void pmu_read_sysfs(void)
 242 {
 243         char path[PATH_MAX];
 244         const char *sysfs;
 245         DIR *dir;
 246         struct dirent *dent;
 247
 248         sysfs = sysfs_find_mountpoint();
 249         if (!sysfs)
 250                 return;
 251
 252         snprintf(path, PATH_MAX,
 253                  "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
 254
 255         dir = opendir(path);
 256         if (!dir)
 257                 return;
 258
 259         while ((dent = readdir(dir))) {
 260                 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
 261                         continue;
 262                 /* add to static LIST_HEAD(pmus): */
 263                 perf_pmu__find(dent->d_name);
 264         }
 265
 266         closedir(dir);
 267 }
 268
 269 static struct cpu_map *pmu_cpumask(char *name)
 270 {
 271         struct stat st;
 272         char path[PATH_MAX];
 273         const char *sysfs;
 274         FILE *file;
 275         struct cpu_map *cpus;
 276
 277         sysfs = sysfs_find_mountpoint();
 278         if (!sysfs)
 279                 return NULL;
 280
 281         snprintf(path, PATH_MAX,
 282                  "%s/bus/event_source/devices/%s/cpumask", sysfs, name);
 283
 284         if (stat(path, &st) < 0)
 285                 return NULL;
 286
 287         file = fopen(path, "r");
 288         if (!file)
 289                 return NULL;
 290
 291         cpus = cpu_map__read(file);
 292         fclose(file);
 293         return cpus;
 294 }
 295
 296 static struct perf_pmu *pmu_lookup(char *name)
 297 {
 298         struct perf_pmu *pmu;
 299         LIST_HEAD(format);
 300         LIST_HEAD(aliases);
 301         __u32 type;
 302
 303         /*
 304          * The pmu data we store & need consists of the pmu
 305          * type value and format definitions. Load both right
 306          * now.
 307          */
 308         if (pmu_format(name, &format))
 309                 return NULL;
 310
 311         if (pmu_aliases(name, &aliases))
 312                 return NULL;
 313
 314         if (pmu_type(name, &type))
 315                 return NULL;
 316
 317         pmu = zalloc(sizeof(*pmu));
 318         if (!pmu)
 319                 return NULL;
 320
 321         pmu->cpus = pmu_cpumask(name);
 322
 323         INIT_LIST_HEAD(&pmu->format);
 324         INIT_LIST_HEAD(&pmu->aliases);
 325         list_splice(&format, &pmu->format);
 326         list_splice(&aliases, &pmu->aliases);
 327         pmu->name = strdup(name);
 328         pmu->type = type;
 329         list_add_tail(&pmu->list, &pmus);
 330         return pmu;
 331 }
 332
 333 static struct perf_pmu *pmu_find(char *name)
 334 {
 335         struct perf_pmu *pmu;
 336
 337         list_for_each_entry(pmu, &pmus, list)
 338                 if (!strcmp(pmu->name, name))
 339                         return pmu;
 340
 341         return NULL;
 342 }
 343
 344 struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
 345 {
 346         /*
 347          * pmu iterator: If pmu is NULL, we start at the begin,
 348          * otherwise return the next pmu. Returns NULL on end.
 349          */
 350         if (!pmu) {
 351                 pmu_read_sysfs();
 352                 pmu = list_prepare_entry(pmu, &pmus, list);
 353         }
 354         list_for_each_entry_continue(pmu, &pmus, list)
 355                 return pmu;
 356         return NULL;
 357 }
 358
 359 struct perf_pmu *perf_pmu__find(char *name)
 360 {
 361         struct perf_pmu *pmu;
 362
 363         /*
 364          * Once PMU is loaded it stays in the list,
 365          * so we keep us from multiple reading/parsing
 366          * the pmu format definitions.
 367          */
 368         pmu = pmu_find(name);
 369         if (pmu)
 370                 return pmu;
 371
 372         return pmu_lookup(name);
 373 }
 374
 375 static struct perf_pmu_format *
 376 pmu_find_format(struct list_head *formats, char *name)
 377 {
 378         struct perf_pmu_format *format;
 379
 380         list_for_each_entry(format, formats, list)
 381                 if (!strcmp(format->name, name))
 382                         return format;
 383
 384         return NULL;
 385 }
 386
 387 /*
 388  * Returns value based on the format definition (format parameter)
 389  * and unformated value (value parameter).
 390  *
 391  * TODO maybe optimize a little ;)
 392  */
 393 static __u64 pmu_format_value(unsigned long *format, __u64 value)
 394 {
 395         unsigned long fbit, vbit;
 396         __u64 v = 0;
 397
 398         for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
 399
 400                 if (!test_bit(fbit, format))
 401                         continue;
 402
 403                 if (!(value & (1llu << vbit++)))
 404                         continue;
 405
 406                 v |= (1llu << fbit);
 407         }
 408
 409         return v;
 410 }
 411
 412 /*
 413  * Setup one of config[12] attr members based on the
 414  * user input data - temr parameter.
 415  */
 416 static int pmu_config_term(struct list_head *formats,
 417                            struct perf_event_attr *attr,
 418                            struct parse_events_term *term)
 419 {
 420         struct perf_pmu_format *format;
 421         __u64 *vp;
 422
 423         /*
 424          * Support only for hardcoded and numnerial terms.
 425          * Hardcoded terms should be already in, so nothing
 426          * to be done for them.
 427          */
 428         if (parse_events__is_hardcoded_term(term))
 429                 return 0;
 430
 431         if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM)
 432                 return -EINVAL;
 433
 434         format = pmu_find_format(formats, term->config);
 435         if (!format)
 436                 return -EINVAL;
 437
 438         switch (format->value) {
 439         case PERF_PMU_FORMAT_VALUE_CONFIG:
 440                 vp = &attr->config;
 441                 break;
 442         case PERF_PMU_FORMAT_VALUE_CONFIG1:
 443                 vp = &attr->config1;
 444                 break;
 445         case PERF_PMU_FORMAT_VALUE_CONFIG2:
 446                 vp = &attr->config2;
 447                 break;
 448         default:
 449                 return -EINVAL;
 450         }
 451
 452         /*
 453          * XXX If we ever decide to go with string values for
 454          * non-hardcoded terms, here's the place to translate
 455          * them into value.
 456          */
 457         *vp |= pmu_format_value(format->bits, term->val.num);
 458         return 0;
 459 }
 460
 461 int perf_pmu__config_terms(struct list_head *formats,
 462                            struct perf_event_attr *attr,
 463                            struct list_head *head_terms)
 464 {
 465         struct parse_events_term *term;
 466
 467         list_for_each_entry(term, head_terms, list)
 468                 if (pmu_config_term(formats, attr, term))
 469                         return -EINVAL;
 470
 471         return 0;
 472 }
 473
 474 /*
 475  * Configures event's 'attr' parameter based on the:
 476  * 1) users input - specified in terms parameter
 477  * 2) pmu format definitions - specified by pmu parameter
 478  */
 479 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
 480                      struct list_head *head_terms)
 481 {
 482         attr->type = pmu->type;
 483         return perf_pmu__config_terms(&pmu->format, attr, head_terms);
 484 }
 485
 486 static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
 487                                              struct parse_events_term *term)
 488 {
 489         struct perf_pmu_alias *alias;
 490         char *name;
 491
 492         if (parse_events__is_hardcoded_term(term))
 493                 return NULL;
 494
 495         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
 496                 if (term->val.num != 1)
 497                         return NULL;
 498                 if (pmu_find_format(&pmu->format, term->config))
 499                         return NULL;
 500                 name = term->config;
 501         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
 502                 if (strcasecmp(term->config, "event"))
 503                         return NULL;
 504                 name = term->val.str;
 505         } else {
 506                 return NULL;
 507         }
 508
 509         list_for_each_entry(alias, &pmu->aliases, list) {
 510                 if (!strcasecmp(alias->name, name))
 511                         return alias;
 512         }
 513         return NULL;
 514 }
 515
 516 /*
 517  * Find alias in the terms list and replace it with the terms
 518  * defined for the alias
 519  */
 520 int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms)
 521 {
 522         struct parse_events_term *term, *h;
 523         struct perf_pmu_alias *alias;
 524         int ret;
 525
 526         list_for_each_entry_safe(term, h, head_terms, list) {
 527                 alias = pmu_find_alias(pmu, term);
 528                 if (!alias)
 529                         continue;
 530                 ret = pmu_alias_terms(alias, &term->list);
 531                 if (ret)
 532                         return ret;
 533                 list_del(&term->list);
 534                 free(term);
 535         }
 536         return 0;
 537 }
 538
 539 int perf_pmu__new_format(struct list_head *list, char *name,
 540                          int config, unsigned long *bits)
 541 {
 542         struct perf_pmu_format *format;
 543
 544         format = zalloc(sizeof(*format));
 545         if (!format)
 546                 return -ENOMEM;
 547
 548         format->name = strdup(name);
 549         format->value = config;
 550         memcpy(format->bits, bits, sizeof(format->bits));
 551
 552         list_add_tail(&format->list, list);
 553         return 0;
 554 }
 555
 556 void perf_pmu__set_format(unsigned long *bits, long from, long to)
 557 {
 558         long b;
 559
 560         if (!to)
 561                 to = from;
 562
 563         memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
 564         for (b = from; b <= to; b++)
 565                 set_bit(b, bits);
 566 }