1 #include <linux/list.h>
2 #include <linux/compiler.h>
13 #include "parse-events.h"
16 struct perf_pmu_format {
19 DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
20 struct list_head list;
23 #define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
25 int perf_pmu_parse(struct list_head *list, char *name);
26 extern FILE *perf_pmu_in;
28 static LIST_HEAD(pmus);
31 * Parse & process all the sysfs attributes located under
32 * the directory specified in 'dir' parameter.
34 int perf_pmu__format_parse(char *dir, struct list_head *head)
36 struct dirent *evt_ent;
40 format_dir = opendir(dir);
44 while (!ret && (evt_ent = readdir(format_dir))) {
46 char *name = evt_ent->d_name;
49 if (!strcmp(name, ".") || !strcmp(name, ".."))
52 snprintf(path, PATH_MAX, "%s/%s", dir, name);
55 file = fopen(path, "r");
60 ret = perf_pmu_parse(head, name);
69 * Reading/parsing the default pmu format definition, which should be
71 * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
73 static int pmu_format(const char *name, struct list_head *format)
77 const char *sysfs = sysfs__mountpoint();
82 snprintf(path, PATH_MAX,
83 "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);
85 if (stat(path, &st) < 0)
86 return 0; /* no error if format does not exist */
88 if (perf_pmu__format_parse(path, format))
94 static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *name)
103 snprintf(path, PATH_MAX, "%s/%s.scale", dir, name);
105 fd = open(path, O_RDONLY);
109 if (fstat(fd, &st) < 0)
112 sret = read(fd, scale, sizeof(scale)-1);
116 if (scale[sret - 1] == '\n')
117 scale[sret - 1] = '\0';
122 * save current locale
124 lc = setlocale(LC_NUMERIC, NULL);
127 * The lc string may be allocated in static storage,
128 * so get a dynamic copy to make it survive setlocale
138 * force to C locale to ensure kernel
139 * scale string is converted correctly.
140 * kernel uses default C locale.
142 setlocale(LC_NUMERIC, "C");
144 alias->scale = strtod(scale, NULL);
147 setlocale(LC_NUMERIC, lc);
157 static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, char *dir, char *name)
163 snprintf(path, PATH_MAX, "%s/%s.unit", dir, name);
165 fd = open(path, O_RDONLY);
169 sret = read(fd, alias->unit, UNIT_MAX_LEN);
175 if (alias->unit[sret - 1] == '\n')
176 alias->unit[sret - 1] = '\0';
178 alias->unit[sret] = '\0';
183 alias->unit[0] = '\0';
188 perf_pmu__parse_per_pkg(struct perf_pmu_alias *alias, char *dir, char *name)
193 snprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, name);
195 fd = open(path, O_RDONLY);
201 alias->per_pkg = true;
205 static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias,
206 char *dir, char *name)
211 snprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name);
213 fd = open(path, O_RDONLY);
217 alias->snapshot = true;
222 static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
223 char *desc __maybe_unused, char *val)
225 struct perf_pmu_alias *alias;
228 alias = malloc(sizeof(*alias));
232 INIT_LIST_HEAD(&alias->terms);
234 alias->unit[0] = '\0';
235 alias->per_pkg = false;
236 alias->snapshot = false;
238 ret = parse_events_terms(&alias->terms, val);
240 pr_err("Cannot parse alias %s: %d\n", val, ret);
245 alias->name = strdup(name);
248 * load unit name and scale if available
250 perf_pmu__parse_unit(alias, dir, name);
251 perf_pmu__parse_scale(alias, dir, name);
252 perf_pmu__parse_per_pkg(alias, dir, name);
253 perf_pmu__parse_snapshot(alias, dir, name);
256 list_add_tail(&alias->list, list);
261 static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
266 ret = fread(buf, 1, sizeof(buf), file);
272 return __perf_pmu__new_alias(list, dir, name, NULL, buf);
275 static inline bool pmu_alias_info_file(char *name)
280 if (len > 5 && !strcmp(name + len - 5, ".unit"))
282 if (len > 6 && !strcmp(name + len - 6, ".scale"))
284 if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
286 if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
293 * Process all the sysfs attributes located under the directory
294 * specified in 'dir' parameter.
296 static int pmu_aliases_parse(char *dir, struct list_head *head)
298 struct dirent *evt_ent;
301 event_dir = opendir(dir);
305 while ((evt_ent = readdir(event_dir))) {
307 char *name = evt_ent->d_name;
310 if (!strcmp(name, ".") || !strcmp(name, ".."))
314 * skip info files parsed in perf_pmu__new_alias()
316 if (pmu_alias_info_file(name))
319 snprintf(path, PATH_MAX, "%s/%s", dir, name);
321 file = fopen(path, "r");
323 pr_debug("Cannot open %s\n", path);
327 if (perf_pmu__new_alias(head, dir, name, file) < 0)
328 pr_debug("Cannot set up %s\n", name);
337 * Reading the pmu event aliases definition, which should be located at:
338 * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
340 static int pmu_aliases(const char *name, struct list_head *head)
344 const char *sysfs = sysfs__mountpoint();
349 snprintf(path, PATH_MAX,
350 "%s/bus/event_source/devices/%s/events", sysfs, name);
352 if (stat(path, &st) < 0)
353 return 0; /* no error if 'events' does not exist */
355 if (pmu_aliases_parse(path, head))
361 static int pmu_alias_terms(struct perf_pmu_alias *alias,
362 struct list_head *terms)
364 struct parse_events_term *term, *cloned;
368 list_for_each_entry(term, &alias->terms, list) {
369 ret = parse_events_term__clone(&cloned, term);
371 parse_events_terms__purge(&list);
374 list_add_tail(&cloned->list, &list);
376 list_splice(&list, terms);
381 * Reading/parsing the default pmu type value, which should be
383 * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
385 static int pmu_type(const char *name, __u32 *type)
391 const char *sysfs = sysfs__mountpoint();
396 snprintf(path, PATH_MAX,
397 "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
399 if (stat(path, &st) < 0)
402 file = fopen(path, "r");
406 if (1 != fscanf(file, "%u", type))
413 /* Add all pmus in sysfs to pmu list: */
414 static void pmu_read_sysfs(void)
419 const char *sysfs = sysfs__mountpoint();
424 snprintf(path, PATH_MAX,
425 "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
431 while ((dent = readdir(dir))) {
432 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
434 /* add to static LIST_HEAD(pmus): */
435 perf_pmu__find(dent->d_name);
441 static struct cpu_map *pmu_cpumask(const char *name)
446 struct cpu_map *cpus;
447 const char *sysfs = sysfs__mountpoint();
452 snprintf(path, PATH_MAX,
453 "%s/bus/event_source/devices/%s/cpumask", sysfs, name);
455 if (stat(path, &st) < 0)
458 file = fopen(path, "r");
462 cpus = cpu_map__read(file);
467 struct perf_event_attr * __weak
468 perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
473 static struct perf_pmu *pmu_lookup(const char *name)
475 struct perf_pmu *pmu;
481 * The pmu data we store & need consists of the pmu
482 * type value and format definitions. Load both right
485 if (pmu_format(name, &format))
488 if (pmu_aliases(name, &aliases))
491 if (pmu_type(name, &type))
494 pmu = zalloc(sizeof(*pmu));
498 pmu->cpus = pmu_cpumask(name);
500 INIT_LIST_HEAD(&pmu->format);
501 INIT_LIST_HEAD(&pmu->aliases);
502 list_splice(&format, &pmu->format);
503 list_splice(&aliases, &pmu->aliases);
504 pmu->name = strdup(name);
506 list_add_tail(&pmu->list, &pmus);
508 pmu->default_config = perf_pmu__get_default_config(pmu);
513 static struct perf_pmu *pmu_find(const char *name)
515 struct perf_pmu *pmu;
517 list_for_each_entry(pmu, &pmus, list)
518 if (!strcmp(pmu->name, name))
524 struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
527 * pmu iterator: If pmu is NULL, we start at the begin,
528 * otherwise return the next pmu. Returns NULL on end.
532 pmu = list_prepare_entry(pmu, &pmus, list);
534 list_for_each_entry_continue(pmu, &pmus, list)
539 struct perf_pmu *perf_pmu__find(const char *name)
541 struct perf_pmu *pmu;
544 * Once PMU is loaded it stays in the list,
545 * so we keep us from multiple reading/parsing
546 * the pmu format definitions.
548 pmu = pmu_find(name);
552 return pmu_lookup(name);
555 static struct perf_pmu_format *
556 pmu_find_format(struct list_head *formats, const char *name)
558 struct perf_pmu_format *format;
560 list_for_each_entry(format, formats, list)
561 if (!strcmp(format->name, name))
567 __u64 perf_pmu__format_bits(struct list_head *formats, const char *name)
569 struct perf_pmu_format *format = pmu_find_format(formats, name);
576 for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
577 bits |= 1ULL << fbit;
583 * Sets value based on the format definition (format parameter)
584 * and unformated value (value parameter).
586 static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
589 unsigned long fbit, vbit;
591 for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
593 if (!test_bit(fbit, format))
596 if (value & (1llu << vbit++))
597 *v |= (1llu << fbit);
599 *v &= ~(1llu << fbit);
603 static __u64 pmu_format_max_value(const unsigned long *format)
608 for_each_set_bit(fbit, format, PERF_PMU_FORMAT_BITS)
615 * Term is a string term, and might be a param-term. Try to look up it's value
616 * in the remaining terms.
617 * - We have a term like "base-or-format-term=param-term",
618 * - We need to find the value supplied for "param-term" (with param-term named
619 * in a config string) later on in the term list.
621 static int pmu_resolve_param_term(struct parse_events_term *term,
622 struct list_head *head_terms,
625 struct parse_events_term *t;
627 list_for_each_entry(t, head_terms, list) {
628 if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
629 if (!strcmp(t->config, term->config)) {
638 printf("Required parameter '%s' not specified\n", term->config);
643 static char *pmu_formats_string(struct list_head *formats)
645 struct perf_pmu_format *format;
647 struct strbuf buf = STRBUF_INIT;
653 /* sysfs exported terms */
654 list_for_each_entry(format, formats, list)
655 if (strbuf_addf(&buf, i++ ? ",%s" : "%s", format->name) < 0)
658 str = strbuf_detach(&buf, NULL);
660 strbuf_release(&buf);
666 * Setup one of config[12] attr members based on the
667 * user input data - term parameter.
669 static int pmu_config_term(struct list_head *formats,
670 struct perf_event_attr *attr,
671 struct parse_events_term *term,
672 struct list_head *head_terms,
673 bool zero, struct parse_events_error *err)
675 struct perf_pmu_format *format;
680 * If this is a parameter we've already used for parameterized-eval,
681 * skip it in normal eval.
687 * Hardcoded terms should be already in, so nothing
688 * to be done for them.
690 if (parse_events__is_hardcoded_term(term))
693 format = pmu_find_format(formats, term->config);
696 printf("Invalid event/parameter '%s'\n", term->config);
698 char *pmu_term = pmu_formats_string(formats);
700 err->idx = term->err_term;
701 err->str = strdup("unknown term");
702 err->help = parse_events_formats_error_string(pmu_term);
708 switch (format->value) {
709 case PERF_PMU_FORMAT_VALUE_CONFIG:
712 case PERF_PMU_FORMAT_VALUE_CONFIG1:
715 case PERF_PMU_FORMAT_VALUE_CONFIG2:
723 * Either directly use a numeric term, or try to translate string terms
724 * using event parameters.
726 if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
728 else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
729 if (strcmp(term->val.str, "?")) {
731 pr_info("Invalid sysfs entry %s=%s\n",
732 term->config, term->val.str);
735 err->idx = term->err_val;
736 err->str = strdup("expected numeric value");
741 if (pmu_resolve_param_term(term, head_terms, &val))
746 max_val = pmu_format_max_value(format->bits);
749 err->idx = term->err_val;
750 if (asprintf(&err->str,
751 "value too big for format, maximum is %llu",
752 (unsigned long long)max_val) < 0)
753 err->str = strdup("value too big for format");
757 * Assume we don't care if !err, in which case the value will be
758 * silently truncated.
762 pmu_format_value(format->bits, val, vp, zero);
766 int perf_pmu__config_terms(struct list_head *formats,
767 struct perf_event_attr *attr,
768 struct list_head *head_terms,
769 bool zero, struct parse_events_error *err)
771 struct parse_events_term *term;
773 list_for_each_entry(term, head_terms, list) {
774 if (pmu_config_term(formats, attr, term, head_terms,
783 * Configures event's 'attr' parameter based on the:
784 * 1) users input - specified in terms parameter
785 * 2) pmu format definitions - specified by pmu parameter
787 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
788 struct list_head *head_terms,
789 struct parse_events_error *err)
791 bool zero = !!pmu->default_config;
793 attr->type = pmu->type;
794 return perf_pmu__config_terms(&pmu->format, attr, head_terms,
798 static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
799 struct parse_events_term *term)
801 struct perf_pmu_alias *alias;
804 if (parse_events__is_hardcoded_term(term))
807 if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
808 if (term->val.num != 1)
810 if (pmu_find_format(&pmu->format, term->config))
813 } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
814 if (strcasecmp(term->config, "event"))
816 name = term->val.str;
821 list_for_each_entry(alias, &pmu->aliases, list) {
822 if (!strcasecmp(alias->name, name))
829 static int check_info_data(struct perf_pmu_alias *alias,
830 struct perf_pmu_info *info)
833 * Only one term in event definition can
834 * define unit, scale and snapshot, fail
835 * if there's more than one.
837 if ((info->unit && alias->unit) ||
838 (info->scale && alias->scale) ||
839 (info->snapshot && alias->snapshot))
843 info->unit = alias->unit;
846 info->scale = alias->scale;
849 info->snapshot = alias->snapshot;
855 * Find alias in the terms list and replace it with the terms
856 * defined for the alias
858 int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
859 struct perf_pmu_info *info)
861 struct parse_events_term *term, *h;
862 struct perf_pmu_alias *alias;
865 info->per_pkg = false;
868 * Mark unit and scale as not set
869 * (different from default values, see below)
873 info->snapshot = false;
875 list_for_each_entry_safe(term, h, head_terms, list) {
876 alias = pmu_find_alias(pmu, term);
879 ret = pmu_alias_terms(alias, &term->list);
883 ret = check_info_data(alias, info);
888 info->per_pkg = true;
890 list_del(&term->list);
895 * if no unit or scale foundin aliases, then
896 * set defaults as for evsel
897 * unit cannot left to NULL
899 if (info->unit == NULL)
902 if (info->scale == 0.0)
908 int perf_pmu__new_format(struct list_head *list, char *name,
909 int config, unsigned long *bits)
911 struct perf_pmu_format *format;
913 format = zalloc(sizeof(*format));
917 format->name = strdup(name);
918 format->value = config;
919 memcpy(format->bits, bits, sizeof(format->bits));
921 list_add_tail(&format->list, list);
925 void perf_pmu__set_format(unsigned long *bits, long from, long to)
932 memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
933 for (b = from; b <= to; b++)
937 static int sub_non_neg(int a, int b)
944 static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
945 struct perf_pmu_alias *alias)
947 struct parse_events_term *term;
948 int used = snprintf(buf, len, "%s/%s", pmu->name, alias->name);
950 list_for_each_entry(term, &alias->terms, list) {
951 if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
952 used += snprintf(buf + used, sub_non_neg(len, used),
953 ",%s=%s", term->config,
957 if (sub_non_neg(len, used) > 0) {
961 if (sub_non_neg(len, used) > 0) {
970 static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
971 struct perf_pmu_alias *alias)
973 snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
977 static int cmp_string(const void *a, const void *b)
979 const char * const *as = a;
980 const char * const *bs = b;
981 return strcmp(*as, *bs);
984 void print_pmu_events(const char *event_glob, bool name_only)
986 struct perf_pmu *pmu;
987 struct perf_pmu_alias *alias;
995 while ((pmu = perf_pmu__scan(pmu)) != NULL) {
996 list_for_each_entry(alias, &pmu->aliases, list)
1001 aliases = zalloc(sizeof(char *) * len);
1006 while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1007 list_for_each_entry(alias, &pmu->aliases, list) {
1008 char *name = format_alias(buf, sizeof(buf), pmu, alias);
1009 bool is_cpu = !strcmp(pmu->name, "cpu");
1011 if (event_glob != NULL &&
1012 !(strglobmatch(name, event_glob) ||
1013 (!is_cpu && strglobmatch(alias->name,
1017 if (is_cpu && !name_only)
1018 name = format_alias_or(buf, sizeof(buf), pmu, alias);
1020 aliases[j] = strdup(name);
1021 if (aliases[j] == NULL)
1025 if (pmu->selectable &&
1026 (event_glob == NULL || strglobmatch(pmu->name, event_glob))) {
1028 if (asprintf(&s, "%s//", pmu->name) < 0)
1035 qsort(aliases, len, sizeof(char *), cmp_string);
1036 for (j = 0; j < len; j++) {
1038 printf("%s ", aliases[j]);
1041 printf(" %-50s [Kernel PMU event]\n", aliases[j]);
1044 if (printed && pager_in_use())
1047 for (j = 0; j < len; j++)
1053 printf("FATAL: not enough memory to print PMU events\n");
1058 bool pmu_have_event(const char *pname, const char *name)
1060 struct perf_pmu *pmu;
1061 struct perf_pmu_alias *alias;
1064 while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1065 if (strcmp(pname, pmu->name))
1067 list_for_each_entry(alias, &pmu->aliases, list)
1068 if (!strcmp(alias->name, name))
1074 static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
1077 char path[PATH_MAX];
1080 sysfs = sysfs__mountpoint();
1084 snprintf(path, PATH_MAX,
1085 "%s" EVENT_SOURCE_DEVICE_PATH "%s/%s", sysfs, pmu->name, name);
1087 if (stat(path, &st) < 0)
1090 return fopen(path, "r");
1093 int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
1100 va_start(args, fmt);
1101 file = perf_pmu__open_file(pmu, name);
1103 ret = vfscanf(file, fmt, args);