Loading...
Note: File does not exist in v3.1.
1#include <linux/list.h>
2#include <linux/compiler.h>
3#include <sys/types.h>
4#include <unistd.h>
5#include <stdio.h>
6#include <stdbool.h>
7#include <stdarg.h>
8#include <dirent.h>
9#include <api/fs/fs.h>
10#include <locale.h>
11#include "util.h"
12#include "pmu.h"
13#include "parse-events.h"
14#include "cpumap.h"
15
16struct perf_pmu_format {
17 char *name;
18 int value;
19 DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
20 struct list_head list;
21};
22
23#define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
24
25int perf_pmu_parse(struct list_head *list, char *name);
26extern FILE *perf_pmu_in;
27
28static LIST_HEAD(pmus);
29
30/*
31 * Parse & process all the sysfs attributes located under
32 * the directory specified in 'dir' parameter.
33 */
34int perf_pmu__format_parse(char *dir, struct list_head *head)
35{
36 struct dirent *evt_ent;
37 DIR *format_dir;
38 int ret = 0;
39
40 format_dir = opendir(dir);
41 if (!format_dir)
42 return -EINVAL;
43
44 while (!ret && (evt_ent = readdir(format_dir))) {
45 char path[PATH_MAX];
46 char *name = evt_ent->d_name;
47 FILE *file;
48
49 if (!strcmp(name, ".") || !strcmp(name, ".."))
50 continue;
51
52 snprintf(path, PATH_MAX, "%s/%s", dir, name);
53
54 ret = -EINVAL;
55 file = fopen(path, "r");
56 if (!file)
57 break;
58
59 perf_pmu_in = file;
60 ret = perf_pmu_parse(head, name);
61 fclose(file);
62 }
63
64 closedir(format_dir);
65 return ret;
66}
67
68/*
69 * Reading/parsing the default pmu format definition, which should be
70 * located at:
71 * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
72 */
73static int pmu_format(const char *name, struct list_head *format)
74{
75 struct stat st;
76 char path[PATH_MAX];
77 const char *sysfs = sysfs__mountpoint();
78
79 if (!sysfs)
80 return -1;
81
82 snprintf(path, PATH_MAX,
83 "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);
84
85 if (stat(path, &st) < 0)
86 return 0; /* no error if format does not exist */
87
88 if (perf_pmu__format_parse(path, format))
89 return -1;
90
91 return 0;
92}
93
94static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *name)
95{
96 struct stat st;
97 ssize_t sret;
98 char scale[128];
99 int fd, ret = -1;
100 char path[PATH_MAX];
101 char *lc;
102
103 snprintf(path, PATH_MAX, "%s/%s.scale", dir, name);
104
105 fd = open(path, O_RDONLY);
106 if (fd == -1)
107 return -1;
108
109 if (fstat(fd, &st) < 0)
110 goto error;
111
112 sret = read(fd, scale, sizeof(scale)-1);
113 if (sret < 0)
114 goto error;
115
116 if (scale[sret - 1] == '\n')
117 scale[sret - 1] = '\0';
118 else
119 scale[sret] = '\0';
120
121 /*
122 * save current locale
123 */
124 lc = setlocale(LC_NUMERIC, NULL);
125
126 /*
127 * The lc string may be allocated in static storage,
128 * so get a dynamic copy to make it survive setlocale
129 * call below.
130 */
131 lc = strdup(lc);
132 if (!lc) {
133 ret = -ENOMEM;
134 goto error;
135 }
136
137 /*
138 * force to C locale to ensure kernel
139 * scale string is converted correctly.
140 * kernel uses default C locale.
141 */
142 setlocale(LC_NUMERIC, "C");
143
144 alias->scale = strtod(scale, NULL);
145
146 /* restore locale */
147 setlocale(LC_NUMERIC, lc);
148
149 free(lc);
150
151 ret = 0;
152error:
153 close(fd);
154 return ret;
155}
156
157static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, char *dir, char *name)
158{
159 char path[PATH_MAX];
160 ssize_t sret;
161 int fd;
162
163 snprintf(path, PATH_MAX, "%s/%s.unit", dir, name);
164
165 fd = open(path, O_RDONLY);
166 if (fd == -1)
167 return -1;
168
169 sret = read(fd, alias->unit, UNIT_MAX_LEN);
170 if (sret < 0)
171 goto error;
172
173 close(fd);
174
175 if (alias->unit[sret - 1] == '\n')
176 alias->unit[sret - 1] = '\0';
177 else
178 alias->unit[sret] = '\0';
179
180 return 0;
181error:
182 close(fd);
183 alias->unit[0] = '\0';
184 return -1;
185}
186
187static int
188perf_pmu__parse_per_pkg(struct perf_pmu_alias *alias, char *dir, char *name)
189{
190 char path[PATH_MAX];
191 int fd;
192
193 snprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, name);
194
195 fd = open(path, O_RDONLY);
196 if (fd == -1)
197 return -1;
198
199 close(fd);
200
201 alias->per_pkg = true;
202 return 0;
203}
204
205static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias,
206 char *dir, char *name)
207{
208 char path[PATH_MAX];
209 int fd;
210
211 snprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name);
212
213 fd = open(path, O_RDONLY);
214 if (fd == -1)
215 return -1;
216
217 alias->snapshot = true;
218 close(fd);
219 return 0;
220}
221
222static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
223 char *desc __maybe_unused, char *val)
224{
225 struct perf_pmu_alias *alias;
226 int ret;
227
228 alias = malloc(sizeof(*alias));
229 if (!alias)
230 return -ENOMEM;
231
232 INIT_LIST_HEAD(&alias->terms);
233 alias->scale = 1.0;
234 alias->unit[0] = '\0';
235 alias->per_pkg = false;
236 alias->snapshot = false;
237
238 ret = parse_events_terms(&alias->terms, val);
239 if (ret) {
240 pr_err("Cannot parse alias %s: %d\n", val, ret);
241 free(alias);
242 return ret;
243 }
244
245 alias->name = strdup(name);
246 if (dir) {
247 /*
248 * load unit name and scale if available
249 */
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);
254 }
255
256 list_add_tail(&alias->list, list);
257
258 return 0;
259}
260
261static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
262{
263 char buf[256];
264 int ret;
265
266 ret = fread(buf, 1, sizeof(buf), file);
267 if (ret == 0)
268 return -EINVAL;
269
270 buf[ret] = 0;
271
272 return __perf_pmu__new_alias(list, dir, name, NULL, buf);
273}
274
275static inline bool pmu_alias_info_file(char *name)
276{
277 size_t len;
278
279 len = strlen(name);
280 if (len > 5 && !strcmp(name + len - 5, ".unit"))
281 return true;
282 if (len > 6 && !strcmp(name + len - 6, ".scale"))
283 return true;
284 if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
285 return true;
286 if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
287 return true;
288
289 return false;
290}
291
292/*
293 * Process all the sysfs attributes located under the directory
294 * specified in 'dir' parameter.
295 */
296static int pmu_aliases_parse(char *dir, struct list_head *head)
297{
298 struct dirent *evt_ent;
299 DIR *event_dir;
300
301 event_dir = opendir(dir);
302 if (!event_dir)
303 return -EINVAL;
304
305 while ((evt_ent = readdir(event_dir))) {
306 char path[PATH_MAX];
307 char *name = evt_ent->d_name;
308 FILE *file;
309
310 if (!strcmp(name, ".") || !strcmp(name, ".."))
311 continue;
312
313 /*
314 * skip info files parsed in perf_pmu__new_alias()
315 */
316 if (pmu_alias_info_file(name))
317 continue;
318
319 snprintf(path, PATH_MAX, "%s/%s", dir, name);
320
321 file = fopen(path, "r");
322 if (!file) {
323 pr_debug("Cannot open %s\n", path);
324 continue;
325 }
326
327 if (perf_pmu__new_alias(head, dir, name, file) < 0)
328 pr_debug("Cannot set up %s\n", name);
329 fclose(file);
330 }
331
332 closedir(event_dir);
333 return 0;
334}
335
336/*
337 * Reading the pmu event aliases definition, which should be located at:
338 * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
339 */
340static int pmu_aliases(const char *name, struct list_head *head)
341{
342 struct stat st;
343 char path[PATH_MAX];
344 const char *sysfs = sysfs__mountpoint();
345
346 if (!sysfs)
347 return -1;
348
349 snprintf(path, PATH_MAX,
350 "%s/bus/event_source/devices/%s/events", sysfs, name);
351
352 if (stat(path, &st) < 0)
353 return 0; /* no error if 'events' does not exist */
354
355 if (pmu_aliases_parse(path, head))
356 return -1;
357
358 return 0;
359}
360
361static int pmu_alias_terms(struct perf_pmu_alias *alias,
362 struct list_head *terms)
363{
364 struct parse_events_term *term, *cloned;
365 LIST_HEAD(list);
366 int ret;
367
368 list_for_each_entry(term, &alias->terms, list) {
369 ret = parse_events_term__clone(&cloned, term);
370 if (ret) {
371 parse_events_terms__purge(&list);
372 return ret;
373 }
374 list_add_tail(&cloned->list, &list);
375 }
376 list_splice(&list, terms);
377 return 0;
378}
379
380/*
381 * Reading/parsing the default pmu type value, which should be
382 * located at:
383 * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
384 */
385static int pmu_type(const char *name, __u32 *type)
386{
387 struct stat st;
388 char path[PATH_MAX];
389 FILE *file;
390 int ret = 0;
391 const char *sysfs = sysfs__mountpoint();
392
393 if (!sysfs)
394 return -1;
395
396 snprintf(path, PATH_MAX,
397 "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
398
399 if (stat(path, &st) < 0)
400 return -1;
401
402 file = fopen(path, "r");
403 if (!file)
404 return -EINVAL;
405
406 if (1 != fscanf(file, "%u", type))
407 ret = -1;
408
409 fclose(file);
410 return ret;
411}
412
413/* Add all pmus in sysfs to pmu list: */
414static void pmu_read_sysfs(void)
415{
416 char path[PATH_MAX];
417 DIR *dir;
418 struct dirent *dent;
419 const char *sysfs = sysfs__mountpoint();
420
421 if (!sysfs)
422 return;
423
424 snprintf(path, PATH_MAX,
425 "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
426
427 dir = opendir(path);
428 if (!dir)
429 return;
430
431 while ((dent = readdir(dir))) {
432 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
433 continue;
434 /* add to static LIST_HEAD(pmus): */
435 perf_pmu__find(dent->d_name);
436 }
437
438 closedir(dir);
439}
440
441static struct cpu_map *pmu_cpumask(const char *name)
442{
443 struct stat st;
444 char path[PATH_MAX];
445 FILE *file;
446 struct cpu_map *cpus;
447 const char *sysfs = sysfs__mountpoint();
448
449 if (!sysfs)
450 return NULL;
451
452 snprintf(path, PATH_MAX,
453 "%s/bus/event_source/devices/%s/cpumask", sysfs, name);
454
455 if (stat(path, &st) < 0)
456 return NULL;
457
458 file = fopen(path, "r");
459 if (!file)
460 return NULL;
461
462 cpus = cpu_map__read(file);
463 fclose(file);
464 return cpus;
465}
466
467struct perf_event_attr * __weak
468perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
469{
470 return NULL;
471}
472
473static struct perf_pmu *pmu_lookup(const char *name)
474{
475 struct perf_pmu *pmu;
476 LIST_HEAD(format);
477 LIST_HEAD(aliases);
478 __u32 type;
479
480 /*
481 * The pmu data we store & need consists of the pmu
482 * type value and format definitions. Load both right
483 * now.
484 */
485 if (pmu_format(name, &format))
486 return NULL;
487
488 if (pmu_aliases(name, &aliases))
489 return NULL;
490
491 if (pmu_type(name, &type))
492 return NULL;
493
494 pmu = zalloc(sizeof(*pmu));
495 if (!pmu)
496 return NULL;
497
498 pmu->cpus = pmu_cpumask(name);
499
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);
505 pmu->type = type;
506 list_add_tail(&pmu->list, &pmus);
507
508 pmu->default_config = perf_pmu__get_default_config(pmu);
509
510 return pmu;
511}
512
513static struct perf_pmu *pmu_find(const char *name)
514{
515 struct perf_pmu *pmu;
516
517 list_for_each_entry(pmu, &pmus, list)
518 if (!strcmp(pmu->name, name))
519 return pmu;
520
521 return NULL;
522}
523
524struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
525{
526 /*
527 * pmu iterator: If pmu is NULL, we start at the begin,
528 * otherwise return the next pmu. Returns NULL on end.
529 */
530 if (!pmu) {
531 pmu_read_sysfs();
532 pmu = list_prepare_entry(pmu, &pmus, list);
533 }
534 list_for_each_entry_continue(pmu, &pmus, list)
535 return pmu;
536 return NULL;
537}
538
539struct perf_pmu *perf_pmu__find(const char *name)
540{
541 struct perf_pmu *pmu;
542
543 /*
544 * Once PMU is loaded it stays in the list,
545 * so we keep us from multiple reading/parsing
546 * the pmu format definitions.
547 */
548 pmu = pmu_find(name);
549 if (pmu)
550 return pmu;
551
552 return pmu_lookup(name);
553}
554
555static struct perf_pmu_format *
556pmu_find_format(struct list_head *formats, const char *name)
557{
558 struct perf_pmu_format *format;
559
560 list_for_each_entry(format, formats, list)
561 if (!strcmp(format->name, name))
562 return format;
563
564 return NULL;
565}
566
567__u64 perf_pmu__format_bits(struct list_head *formats, const char *name)
568{
569 struct perf_pmu_format *format = pmu_find_format(formats, name);
570 __u64 bits = 0;
571 int fbit;
572
573 if (!format)
574 return 0;
575
576 for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
577 bits |= 1ULL << fbit;
578
579 return bits;
580}
581
582/*
583 * Sets value based on the format definition (format parameter)
584 * and unformated value (value parameter).
585 */
586static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
587 bool zero)
588{
589 unsigned long fbit, vbit;
590
591 for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
592
593 if (!test_bit(fbit, format))
594 continue;
595
596 if (value & (1llu << vbit++))
597 *v |= (1llu << fbit);
598 else if (zero)
599 *v &= ~(1llu << fbit);
600 }
601}
602
603static __u64 pmu_format_max_value(const unsigned long *format)
604{
605 int w;
606
607 w = bitmap_weight(format, PERF_PMU_FORMAT_BITS);
608 if (!w)
609 return 0;
610 if (w < 64)
611 return (1ULL << w) - 1;
612 return -1;
613}
614
615/*
616 * Term is a string term, and might be a param-term. Try to look up it's value
617 * in the remaining terms.
618 * - We have a term like "base-or-format-term=param-term",
619 * - We need to find the value supplied for "param-term" (with param-term named
620 * in a config string) later on in the term list.
621 */
622static int pmu_resolve_param_term(struct parse_events_term *term,
623 struct list_head *head_terms,
624 __u64 *value)
625{
626 struct parse_events_term *t;
627
628 list_for_each_entry(t, head_terms, list) {
629 if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
630 if (!strcmp(t->config, term->config)) {
631 t->used = true;
632 *value = t->val.num;
633 return 0;
634 }
635 }
636 }
637
638 if (verbose)
639 printf("Required parameter '%s' not specified\n", term->config);
640
641 return -1;
642}
643
644static char *pmu_formats_string(struct list_head *formats)
645{
646 struct perf_pmu_format *format;
647 char *str;
648 struct strbuf buf;
649 unsigned i = 0;
650
651 if (!formats)
652 return NULL;
653
654 strbuf_init(&buf, 0);
655 /* sysfs exported terms */
656 list_for_each_entry(format, formats, list)
657 strbuf_addf(&buf, i++ ? ",%s" : "%s",
658 format->name);
659
660 str = strbuf_detach(&buf, NULL);
661 strbuf_release(&buf);
662
663 return str;
664}
665
666/*
667 * Setup one of config[12] attr members based on the
668 * user input data - term parameter.
669 */
670static int pmu_config_term(struct list_head *formats,
671 struct perf_event_attr *attr,
672 struct parse_events_term *term,
673 struct list_head *head_terms,
674 bool zero, struct parse_events_error *err)
675{
676 struct perf_pmu_format *format;
677 __u64 *vp;
678 __u64 val, max_val;
679
680 /*
681 * If this is a parameter we've already used for parameterized-eval,
682 * skip it in normal eval.
683 */
684 if (term->used)
685 return 0;
686
687 /*
688 * Hardcoded terms should be already in, so nothing
689 * to be done for them.
690 */
691 if (parse_events__is_hardcoded_term(term))
692 return 0;
693
694 format = pmu_find_format(formats, term->config);
695 if (!format) {
696 if (verbose)
697 printf("Invalid event/parameter '%s'\n", term->config);
698 if (err) {
699 char *pmu_term = pmu_formats_string(formats);
700
701 err->idx = term->err_term;
702 err->str = strdup("unknown term");
703 err->help = parse_events_formats_error_string(pmu_term);
704 free(pmu_term);
705 }
706 return -EINVAL;
707 }
708
709 switch (format->value) {
710 case PERF_PMU_FORMAT_VALUE_CONFIG:
711 vp = &attr->config;
712 break;
713 case PERF_PMU_FORMAT_VALUE_CONFIG1:
714 vp = &attr->config1;
715 break;
716 case PERF_PMU_FORMAT_VALUE_CONFIG2:
717 vp = &attr->config2;
718 break;
719 default:
720 return -EINVAL;
721 }
722
723 /*
724 * Either directly use a numeric term, or try to translate string terms
725 * using event parameters.
726 */
727 if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
728 val = term->val.num;
729 else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
730 if (strcmp(term->val.str, "?")) {
731 if (verbose) {
732 pr_info("Invalid sysfs entry %s=%s\n",
733 term->config, term->val.str);
734 }
735 if (err) {
736 err->idx = term->err_val;
737 err->str = strdup("expected numeric value");
738 }
739 return -EINVAL;
740 }
741
742 if (pmu_resolve_param_term(term, head_terms, &val))
743 return -EINVAL;
744 } else
745 return -EINVAL;
746
747 max_val = pmu_format_max_value(format->bits);
748 if (val > max_val) {
749 if (err) {
750 err->idx = term->err_val;
751 if (asprintf(&err->str,
752 "value too big for format, maximum is %llu",
753 (unsigned long long)max_val) < 0)
754 err->str = strdup("value too big for format");
755 return -EINVAL;
756 }
757 /*
758 * Assume we don't care if !err, in which case the value will be
759 * silently truncated.
760 */
761 }
762
763 pmu_format_value(format->bits, val, vp, zero);
764 return 0;
765}
766
767int perf_pmu__config_terms(struct list_head *formats,
768 struct perf_event_attr *attr,
769 struct list_head *head_terms,
770 bool zero, struct parse_events_error *err)
771{
772 struct parse_events_term *term;
773
774 list_for_each_entry(term, head_terms, list) {
775 if (pmu_config_term(formats, attr, term, head_terms,
776 zero, err))
777 return -EINVAL;
778 }
779
780 return 0;
781}
782
783/*
784 * Configures event's 'attr' parameter based on the:
785 * 1) users input - specified in terms parameter
786 * 2) pmu format definitions - specified by pmu parameter
787 */
788int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
789 struct list_head *head_terms,
790 struct parse_events_error *err)
791{
792 bool zero = !!pmu->default_config;
793
794 attr->type = pmu->type;
795 return perf_pmu__config_terms(&pmu->format, attr, head_terms,
796 zero, err);
797}
798
799static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
800 struct parse_events_term *term)
801{
802 struct perf_pmu_alias *alias;
803 char *name;
804
805 if (parse_events__is_hardcoded_term(term))
806 return NULL;
807
808 if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
809 if (term->val.num != 1)
810 return NULL;
811 if (pmu_find_format(&pmu->format, term->config))
812 return NULL;
813 name = term->config;
814 } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
815 if (strcasecmp(term->config, "event"))
816 return NULL;
817 name = term->val.str;
818 } else {
819 return NULL;
820 }
821
822 list_for_each_entry(alias, &pmu->aliases, list) {
823 if (!strcasecmp(alias->name, name))
824 return alias;
825 }
826 return NULL;
827}
828
829
830static int check_info_data(struct perf_pmu_alias *alias,
831 struct perf_pmu_info *info)
832{
833 /*
834 * Only one term in event definition can
835 * define unit, scale and snapshot, fail
836 * if there's more than one.
837 */
838 if ((info->unit && alias->unit) ||
839 (info->scale && alias->scale) ||
840 (info->snapshot && alias->snapshot))
841 return -EINVAL;
842
843 if (alias->unit)
844 info->unit = alias->unit;
845
846 if (alias->scale)
847 info->scale = alias->scale;
848
849 if (alias->snapshot)
850 info->snapshot = alias->snapshot;
851
852 return 0;
853}
854
855/*
856 * Find alias in the terms list and replace it with the terms
857 * defined for the alias
858 */
859int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
860 struct perf_pmu_info *info)
861{
862 struct parse_events_term *term, *h;
863 struct perf_pmu_alias *alias;
864 int ret;
865
866 info->per_pkg = false;
867
868 /*
869 * Mark unit and scale as not set
870 * (different from default values, see below)
871 */
872 info->unit = NULL;
873 info->scale = 0.0;
874 info->snapshot = false;
875
876 list_for_each_entry_safe(term, h, head_terms, list) {
877 alias = pmu_find_alias(pmu, term);
878 if (!alias)
879 continue;
880 ret = pmu_alias_terms(alias, &term->list);
881 if (ret)
882 return ret;
883
884 ret = check_info_data(alias, info);
885 if (ret)
886 return ret;
887
888 if (alias->per_pkg)
889 info->per_pkg = true;
890
891 list_del(&term->list);
892 free(term);
893 }
894
895 /*
896 * if no unit or scale foundin aliases, then
897 * set defaults as for evsel
898 * unit cannot left to NULL
899 */
900 if (info->unit == NULL)
901 info->unit = "";
902
903 if (info->scale == 0.0)
904 info->scale = 1.0;
905
906 return 0;
907}
908
909int perf_pmu__new_format(struct list_head *list, char *name,
910 int config, unsigned long *bits)
911{
912 struct perf_pmu_format *format;
913
914 format = zalloc(sizeof(*format));
915 if (!format)
916 return -ENOMEM;
917
918 format->name = strdup(name);
919 format->value = config;
920 memcpy(format->bits, bits, sizeof(format->bits));
921
922 list_add_tail(&format->list, list);
923 return 0;
924}
925
926void perf_pmu__set_format(unsigned long *bits, long from, long to)
927{
928 long b;
929
930 if (!to)
931 to = from;
932
933 memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
934 for (b = from; b <= to; b++)
935 set_bit(b, bits);
936}
937
938static int sub_non_neg(int a, int b)
939{
940 if (b > a)
941 return 0;
942 return a - b;
943}
944
945static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
946 struct perf_pmu_alias *alias)
947{
948 struct parse_events_term *term;
949 int used = snprintf(buf, len, "%s/%s", pmu->name, alias->name);
950
951 list_for_each_entry(term, &alias->terms, list) {
952 if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
953 used += snprintf(buf + used, sub_non_neg(len, used),
954 ",%s=%s", term->config,
955 term->val.str);
956 }
957
958 if (sub_non_neg(len, used) > 0) {
959 buf[used] = '/';
960 used++;
961 }
962 if (sub_non_neg(len, used) > 0) {
963 buf[used] = '\0';
964 used++;
965 } else
966 buf[len - 1] = '\0';
967
968 return buf;
969}
970
971static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
972 struct perf_pmu_alias *alias)
973{
974 snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
975 return buf;
976}
977
978static int cmp_string(const void *a, const void *b)
979{
980 const char * const *as = a;
981 const char * const *bs = b;
982 return strcmp(*as, *bs);
983}
984
985void print_pmu_events(const char *event_glob, bool name_only)
986{
987 struct perf_pmu *pmu;
988 struct perf_pmu_alias *alias;
989 char buf[1024];
990 int printed = 0;
991 int len, j;
992 char **aliases;
993
994 pmu = NULL;
995 len = 0;
996 while ((pmu = perf_pmu__scan(pmu)) != NULL) {
997 list_for_each_entry(alias, &pmu->aliases, list)
998 len++;
999 if (pmu->selectable)
1000 len++;
1001 }
1002 aliases = zalloc(sizeof(char *) * len);
1003 if (!aliases)
1004 goto out_enomem;
1005 pmu = NULL;
1006 j = 0;
1007 while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1008 list_for_each_entry(alias, &pmu->aliases, list) {
1009 char *name = format_alias(buf, sizeof(buf), pmu, alias);
1010 bool is_cpu = !strcmp(pmu->name, "cpu");
1011
1012 if (event_glob != NULL &&
1013 !(strglobmatch(name, event_glob) ||
1014 (!is_cpu && strglobmatch(alias->name,
1015 event_glob))))
1016 continue;
1017
1018 if (is_cpu && !name_only)
1019 name = format_alias_or(buf, sizeof(buf), pmu, alias);
1020
1021 aliases[j] = strdup(name);
1022 if (aliases[j] == NULL)
1023 goto out_enomem;
1024 j++;
1025 }
1026 if (pmu->selectable &&
1027 (event_glob == NULL || strglobmatch(pmu->name, event_glob))) {
1028 char *s;
1029 if (asprintf(&s, "%s//", pmu->name) < 0)
1030 goto out_enomem;
1031 aliases[j] = s;
1032 j++;
1033 }
1034 }
1035 len = j;
1036 qsort(aliases, len, sizeof(char *), cmp_string);
1037 for (j = 0; j < len; j++) {
1038 if (name_only) {
1039 printf("%s ", aliases[j]);
1040 continue;
1041 }
1042 printf(" %-50s [Kernel PMU event]\n", aliases[j]);
1043 printed++;
1044 }
1045 if (printed && pager_in_use())
1046 printf("\n");
1047out_free:
1048 for (j = 0; j < len; j++)
1049 zfree(&aliases[j]);
1050 zfree(&aliases);
1051 return;
1052
1053out_enomem:
1054 printf("FATAL: not enough memory to print PMU events\n");
1055 if (aliases)
1056 goto out_free;
1057}
1058
1059bool pmu_have_event(const char *pname, const char *name)
1060{
1061 struct perf_pmu *pmu;
1062 struct perf_pmu_alias *alias;
1063
1064 pmu = NULL;
1065 while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1066 if (strcmp(pname, pmu->name))
1067 continue;
1068 list_for_each_entry(alias, &pmu->aliases, list)
1069 if (!strcmp(alias->name, name))
1070 return true;
1071 }
1072 return false;
1073}
1074
1075static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
1076{
1077 struct stat st;
1078 char path[PATH_MAX];
1079 const char *sysfs;
1080
1081 sysfs = sysfs__mountpoint();
1082 if (!sysfs)
1083 return NULL;
1084
1085 snprintf(path, PATH_MAX,
1086 "%s" EVENT_SOURCE_DEVICE_PATH "%s/%s", sysfs, pmu->name, name);
1087
1088 if (stat(path, &st) < 0)
1089 return NULL;
1090
1091 return fopen(path, "r");
1092}
1093
1094int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
1095 ...)
1096{
1097 va_list args;
1098 FILE *file;
1099 int ret = EOF;
1100
1101 va_start(args, fmt);
1102 file = perf_pmu__open_file(pmu, name);
1103 if (file) {
1104 ret = vfscanf(file, fmt, args);
1105 fclose(file);
1106 }
1107 va_end(args);
1108 return ret;
1109}