1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/list.h>
3 #include <linux/compiler.h>
4 #include <linux/string.h>
5 #include <linux/zalloc.h>
6 #include <subcmd/pager.h>
7 #include <sys/types.h>
8 #include <errno.h>
9 #include <fcntl.h>
10 #include <sys/stat.h>
11 #include <unistd.h>
12 #include <stdio.h>
13 #include <stdbool.h>
14 #include <stdarg.h>
15 #include <dirent.h>
16 #include <api/fs/fs.h>
17 #include <locale.h>
18 #include <regex.h>
19 #include <perf/cpumap.h>
20 #include "debug.h"
21 #include "pmu.h"
22 #include "parse-events.h"
23 #include "header.h"
24 #include "pmu-events/pmu-events.h"
25 #include "string2.h"
26 #include "strbuf.h"
27
28 struct perf_pmu_format {
29 char *name;
30 int value;
31 DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
32 struct list_head list;
33 };
34
35 int perf_pmu_parse(struct list_head *list, char *name);
36 extern FILE *perf_pmu_in;
37
38 static LIST_HEAD(pmus);
39
40 /*
41 * Parse & process all the sysfs attributes located under
42 * the directory specified in 'dir' parameter.
43 */
perf_pmu__format_parse(char * dir,struct list_head * head)44 int perf_pmu__format_parse(char *dir, struct list_head *head)
45 {
46 struct dirent *evt_ent;
47 DIR *format_dir;
48 int ret = 0;
49
50 format_dir = opendir(dir);
51 if (!format_dir)
52 return -EINVAL;
53
54 while (!ret && (evt_ent = readdir(format_dir))) {
55 char path[PATH_MAX];
56 char *name = evt_ent->d_name;
57 FILE *file;
58
59 if (!strcmp(name, ".") || !strcmp(name, ".."))
60 continue;
61
62 snprintf(path, PATH_MAX, "%s/%s", dir, name);
63
64 ret = -EINVAL;
65 file = fopen(path, "r");
66 if (!file)
67 break;
68
69 perf_pmu_in = file;
70 ret = perf_pmu_parse(head, name);
71 fclose(file);
72 }
73
74 closedir(format_dir);
75 return ret;
76 }
77
78 /*
79 * Reading/parsing the default pmu format definition, which should be
80 * located at:
81 * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
82 */
pmu_format(const char * name,struct list_head * format)83 static int pmu_format(const char *name, struct list_head *format)
84 {
85 struct stat st;
86 char path[PATH_MAX];
87 const char *sysfs = sysfs__mountpoint();
88
89 if (!sysfs)
90 return -1;
91
92 snprintf(path, PATH_MAX,
93 "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);
94
95 if (stat(path, &st) < 0)
96 return 0; /* no error if format does not exist */
97
98 if (perf_pmu__format_parse(path, format))
99 return -1;
100
101 return 0;
102 }
103
perf_pmu__convert_scale(const char * scale,char ** end,double * sval)104 int perf_pmu__convert_scale(const char *scale, char **end, double *sval)
105 {
106 char *lc;
107 int ret = 0;
108
109 /*
110 * save current locale
111 */
112 lc = setlocale(LC_NUMERIC, NULL);
113
114 /*
115 * The lc string may be allocated in static storage,
116 * so get a dynamic copy to make it survive setlocale
117 * call below.
118 */
119 lc = strdup(lc);
120 if (!lc) {
121 ret = -ENOMEM;
122 goto out;
123 }
124
125 /*
126 * force to C locale to ensure kernel
127 * scale string is converted correctly.
128 * kernel uses default C locale.
129 */
130 setlocale(LC_NUMERIC, "C");
131
132 *sval = strtod(scale, end);
133
134 out:
135 /* restore locale */
136 setlocale(LC_NUMERIC, lc);
137 free(lc);
138 return ret;
139 }
140
perf_pmu__parse_scale(struct perf_pmu_alias * alias,char * dir,char * name)141 static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *name)
142 {
143 struct stat st;
144 ssize_t sret;
145 char scale[128];
146 int fd, ret = -1;
147 char path[PATH_MAX];
148
149 scnprintf(path, PATH_MAX, "%s/%s.scale", dir, name);
150
151 fd = open(path, O_RDONLY);
152 if (fd == -1)
153 return -1;
154
155 if (fstat(fd, &st) < 0)
156 goto error;
157
158 sret = read(fd, scale, sizeof(scale)-1);
159 if (sret < 0)
160 goto error;
161
162 if (scale[sret - 1] == '\n')
163 scale[sret - 1] = '\0';
164 else
165 scale[sret] = '\0';
166
167 ret = perf_pmu__convert_scale(scale, NULL, &alias->scale);
168 error:
169 close(fd);
170 return ret;
171 }
172
perf_pmu__parse_unit(struct perf_pmu_alias * alias,char * dir,char * name)173 static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, char *dir, char *name)
174 {
175 char path[PATH_MAX];
176 ssize_t sret;
177 int fd;
178
179 scnprintf(path, PATH_MAX, "%s/%s.unit", dir, name);
180
181 fd = open(path, O_RDONLY);
182 if (fd == -1)
183 return -1;
184
185 sret = read(fd, alias->unit, UNIT_MAX_LEN);
186 if (sret < 0)
187 goto error;
188
189 close(fd);
190
191 if (alias->unit[sret - 1] == '\n')
192 alias->unit[sret - 1] = '\0';
193 else
194 alias->unit[sret] = '\0';
195
196 return 0;
197 error:
198 close(fd);
199 alias->unit[0] = '\0';
200 return -1;
201 }
202
203 static int
perf_pmu__parse_per_pkg(struct perf_pmu_alias * alias,char * dir,char * name)204 perf_pmu__parse_per_pkg(struct perf_pmu_alias *alias, char *dir, char *name)
205 {
206 char path[PATH_MAX];
207 int fd;
208
209 scnprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, name);
210
211 fd = open(path, O_RDONLY);
212 if (fd == -1)
213 return -1;
214
215 close(fd);
216
217 alias->per_pkg = true;
218 return 0;
219 }
220
perf_pmu__parse_snapshot(struct perf_pmu_alias * alias,char * dir,char * name)221 static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias,
222 char *dir, char *name)
223 {
224 char path[PATH_MAX];
225 int fd;
226
227 scnprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name);
228
229 fd = open(path, O_RDONLY);
230 if (fd == -1)
231 return -1;
232
233 alias->snapshot = true;
234 close(fd);
235 return 0;
236 }
237
perf_pmu_assign_str(char * name,const char * field,char ** old_str,char ** new_str)238 static void perf_pmu_assign_str(char *name, const char *field, char **old_str,
239 char **new_str)
240 {
241 if (!*old_str)
242 goto set_new;
243
244 if (*new_str) { /* Have new string, check with old */
245 if (strcasecmp(*old_str, *new_str))
246 pr_debug("alias %s differs in field '%s'\n",
247 name, field);
248 zfree(old_str);
249 } else /* Nothing new --> keep old string */
250 return;
251 set_new:
252 *old_str = *new_str;
253 *new_str = NULL;
254 }
255
perf_pmu_update_alias(struct perf_pmu_alias * old,struct perf_pmu_alias * newalias)256 static void perf_pmu_update_alias(struct perf_pmu_alias *old,
257 struct perf_pmu_alias *newalias)
258 {
259 perf_pmu_assign_str(old->name, "desc", &old->desc, &newalias->desc);
260 perf_pmu_assign_str(old->name, "long_desc", &old->long_desc,
261 &newalias->long_desc);
262 perf_pmu_assign_str(old->name, "topic", &old->topic, &newalias->topic);
263 perf_pmu_assign_str(old->name, "metric_expr", &old->metric_expr,
264 &newalias->metric_expr);
265 perf_pmu_assign_str(old->name, "metric_name", &old->metric_name,
266 &newalias->metric_name);
267 perf_pmu_assign_str(old->name, "value", &old->str, &newalias->str);
268 old->scale = newalias->scale;
269 old->per_pkg = newalias->per_pkg;
270 old->snapshot = newalias->snapshot;
271 memcpy(old->unit, newalias->unit, sizeof(old->unit));
272 }
273
274 /* Delete an alias entry. */
perf_pmu_free_alias(struct perf_pmu_alias * newalias)275 static void perf_pmu_free_alias(struct perf_pmu_alias *newalias)
276 {
277 zfree(&newalias->name);
278 zfree(&newalias->desc);
279 zfree(&newalias->long_desc);
280 zfree(&newalias->topic);
281 zfree(&newalias->str);
282 zfree(&newalias->metric_expr);
283 zfree(&newalias->metric_name);
284 parse_events_terms__purge(&newalias->terms);
285 free(newalias);
286 }
287
288 /* Merge an alias, search in alias list. If this name is already
289 * present merge both of them to combine all information.
290 */
perf_pmu_merge_alias(struct perf_pmu_alias * newalias,struct list_head * alist)291 static bool perf_pmu_merge_alias(struct perf_pmu_alias *newalias,
292 struct list_head *alist)
293 {
294 struct perf_pmu_alias *a;
295
296 list_for_each_entry(a, alist, list) {
297 if (!strcasecmp(newalias->name, a->name)) {
298 perf_pmu_update_alias(a, newalias);
299 perf_pmu_free_alias(newalias);
300 return true;
301 }
302 }
303 return false;
304 }
305
__perf_pmu__new_alias(struct list_head * list,char * dir,char * name,char * desc,char * val,char * long_desc,char * topic,char * unit,char * perpkg,char * metric_expr,char * metric_name)306 static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
307 char *desc, char *val,
308 char *long_desc, char *topic,
309 char *unit, char *perpkg,
310 char *metric_expr,
311 char *metric_name)
312 {
313 struct parse_events_term *term;
314 struct perf_pmu_alias *alias;
315 int ret;
316 int num;
317 char newval[256];
318
319 alias = malloc(sizeof(*alias));
320 if (!alias)
321 return -ENOMEM;
322
323 INIT_LIST_HEAD(&alias->terms);
324 alias->scale = 1.0;
325 alias->unit[0] = '\0';
326 alias->per_pkg = false;
327 alias->snapshot = false;
328
329 ret = parse_events_terms(&alias->terms, val);
330 if (ret) {
331 pr_err("Cannot parse alias %s: %d\n", val, ret);
332 free(alias);
333 return ret;
334 }
335
336 /* Scan event and remove leading zeroes, spaces, newlines, some
337 * platforms have terms specified as
338 * event=0x0091 (read from files ../<PMU>/events/<FILE>
339 * and terms specified as event=0x91 (read from JSON files).
340 *
341 * Rebuild string to make alias->str member comparable.
342 */
343 memset(newval, 0, sizeof(newval));
344 ret = 0;
345 list_for_each_entry(term, &alias->terms, list) {
346 if (ret)
347 ret += scnprintf(newval + ret, sizeof(newval) - ret,
348 ",");
349 if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
350 ret += scnprintf(newval + ret, sizeof(newval) - ret,
351 "%s=%#x", term->config, term->val.num);
352 else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
353 ret += scnprintf(newval + ret, sizeof(newval) - ret,
354 "%s=%s", term->config, term->val.str);
355 }
356
357 alias->name = strdup(name);
358 if (dir) {
359 /*
360 * load unit name and scale if available
361 */
362 perf_pmu__parse_unit(alias, dir, name);
363 perf_pmu__parse_scale(alias, dir, name);
364 perf_pmu__parse_per_pkg(alias, dir, name);
365 perf_pmu__parse_snapshot(alias, dir, name);
366 }
367
368 alias->metric_expr = metric_expr ? strdup(metric_expr) : NULL;
369 alias->metric_name = metric_name ? strdup(metric_name): NULL;
370 alias->desc = desc ? strdup(desc) : NULL;
371 alias->long_desc = long_desc ? strdup(long_desc) :
372 desc ? strdup(desc) : NULL;
373 alias->topic = topic ? strdup(topic) : NULL;
374 if (unit) {
375 if (perf_pmu__convert_scale(unit, &unit, &alias->scale) < 0)
376 return -1;
377 snprintf(alias->unit, sizeof(alias->unit), "%s", unit);
378 }
379 alias->per_pkg = perpkg && sscanf(perpkg, "%d", &num) == 1 && num == 1;
380 alias->str = strdup(newval);
381
382 if (!perf_pmu_merge_alias(alias, list))
383 list_add_tail(&alias->list, list);
384
385 return 0;
386 }
387
perf_pmu__new_alias(struct list_head * list,char * dir,char * name,FILE * file)388 static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
389 {
390 char buf[256];
391 int ret;
392
393 ret = fread(buf, 1, sizeof(buf), file);
394 if (ret == 0)
395 return -EINVAL;
396
397 buf[ret] = 0;
398
399 /* Remove trailing newline from sysfs file */
400 strim(buf);
401
402 return __perf_pmu__new_alias(list, dir, name, NULL, buf, NULL, NULL, NULL,
403 NULL, NULL, NULL);
404 }
405
pmu_alias_info_file(char * name)406 static inline bool pmu_alias_info_file(char *name)
407 {
408 size_t len;
409
410 len = strlen(name);
411 if (len > 5 && !strcmp(name + len - 5, ".unit"))
412 return true;
413 if (len > 6 && !strcmp(name + len - 6, ".scale"))
414 return true;
415 if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
416 return true;
417 if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
418 return true;
419
420 return false;
421 }
422
423 /*
424 * Process all the sysfs attributes located under the directory
425 * specified in 'dir' parameter.
426 */
pmu_aliases_parse(char * dir,struct list_head * head)427 static int pmu_aliases_parse(char *dir, struct list_head *head)
428 {
429 struct dirent *evt_ent;
430 DIR *event_dir;
431
432 event_dir = opendir(dir);
433 if (!event_dir)
434 return -EINVAL;
435
436 while ((evt_ent = readdir(event_dir))) {
437 char path[PATH_MAX];
438 char *name = evt_ent->d_name;
439 FILE *file;
440
441 if (!strcmp(name, ".") || !strcmp(name, ".."))
442 continue;
443
444 /*
445 * skip info files parsed in perf_pmu__new_alias()
446 */
447 if (pmu_alias_info_file(name))
448 continue;
449
450 scnprintf(path, PATH_MAX, "%s/%s", dir, name);
451
452 file = fopen(path, "r");
453 if (!file) {
454 pr_debug("Cannot open %s\n", path);
455 continue;
456 }
457
458 if (perf_pmu__new_alias(head, dir, name, file) < 0)
459 pr_debug("Cannot set up %s\n", name);
460 fclose(file);
461 }
462
463 closedir(event_dir);
464 return 0;
465 }
466
467 /*
468 * Reading the pmu event aliases definition, which should be located at:
469 * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
470 */
pmu_aliases(const char * name,struct list_head * head)471 static int pmu_aliases(const char *name, struct list_head *head)
472 {
473 struct stat st;
474 char path[PATH_MAX];
475 const char *sysfs = sysfs__mountpoint();
476
477 if (!sysfs)
478 return -1;
479
480 snprintf(path, PATH_MAX,
481 "%s/bus/event_source/devices/%s/events", sysfs, name);
482
483 if (stat(path, &st) < 0)
484 return 0; /* no error if 'events' does not exist */
485
486 if (pmu_aliases_parse(path, head))
487 return -1;
488
489 return 0;
490 }
491
pmu_alias_terms(struct perf_pmu_alias * alias,struct list_head * terms)492 static int pmu_alias_terms(struct perf_pmu_alias *alias,
493 struct list_head *terms)
494 {
495 struct parse_events_term *term, *cloned;
496 LIST_HEAD(list);
497 int ret;
498
499 list_for_each_entry(term, &alias->terms, list) {
500 ret = parse_events_term__clone(&cloned, term);
501 if (ret) {
502 parse_events_terms__purge(&list);
503 return ret;
504 }
505 /*
506 * Weak terms don't override command line options,
507 * which we don't want for implicit terms in aliases.
508 */
509 cloned->weak = true;
510 list_add_tail(&cloned->list, &list);
511 }
512 list_splice(&list, terms);
513 return 0;
514 }
515
516 /*
517 * Reading/parsing the default pmu type value, which should be
518 * located at:
519 * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
520 */
pmu_type(const char * name,__u32 * type)521 static int pmu_type(const char *name, __u32 *type)
522 {
523 struct stat st;
524 char path[PATH_MAX];
525 FILE *file;
526 int ret = 0;
527 const char *sysfs = sysfs__mountpoint();
528
529 if (!sysfs)
530 return -1;
531
532 snprintf(path, PATH_MAX,
533 "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
534
535 if (stat(path, &st) < 0)
536 return -1;
537
538 file = fopen(path, "r");
539 if (!file)
540 return -EINVAL;
541
542 if (1 != fscanf(file, "%u", type))
543 ret = -1;
544
545 fclose(file);
546 return ret;
547 }
548
549 /* Add all pmus in sysfs to pmu list: */
pmu_read_sysfs(void)550 static void pmu_read_sysfs(void)
551 {
552 char path[PATH_MAX];
553 DIR *dir;
554 struct dirent *dent;
555 const char *sysfs = sysfs__mountpoint();
556
557 if (!sysfs)
558 return;
559
560 snprintf(path, PATH_MAX,
561 "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
562
563 dir = opendir(path);
564 if (!dir)
565 return;
566
567 while ((dent = readdir(dir))) {
568 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
569 continue;
570 /* add to static LIST_HEAD(pmus): */
571 perf_pmu__find(dent->d_name);
572 }
573
574 closedir(dir);
575 }
576
__pmu_cpumask(const char * path)577 static struct perf_cpu_map *__pmu_cpumask(const char *path)
578 {
579 FILE *file;
580 struct perf_cpu_map *cpus;
581
582 file = fopen(path, "r");
583 if (!file)
584 return NULL;
585
586 cpus = perf_cpu_map__read(file);
587 fclose(file);
588 return cpus;
589 }
590
591 /*
592 * Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64)
593 * may have a "cpus" file.
594 */
595 #define CPUS_TEMPLATE_UNCORE "%s/bus/event_source/devices/%s/cpumask"
596 #define CPUS_TEMPLATE_CPU "%s/bus/event_source/devices/%s/cpus"
597
pmu_cpumask(const char * name)598 static struct perf_cpu_map *pmu_cpumask(const char *name)
599 {
600 char path[PATH_MAX];
601 struct perf_cpu_map *cpus;
602 const char *sysfs = sysfs__mountpoint();
603 const char *templates[] = {
604 CPUS_TEMPLATE_UNCORE,
605 CPUS_TEMPLATE_CPU,
606 NULL
607 };
608 const char **template;
609
610 if (!sysfs)
611 return NULL;
612
613 for (template = templates; *template; template++) {
614 snprintf(path, PATH_MAX, *template, sysfs, name);
615 cpus = __pmu_cpumask(path);
616 if (cpus)
617 return cpus;
618 }
619
620 return NULL;
621 }
622
pmu_is_uncore(const char * name)623 static bool pmu_is_uncore(const char *name)
624 {
625 char path[PATH_MAX];
626 struct perf_cpu_map *cpus;
627 const char *sysfs = sysfs__mountpoint();
628
629 snprintf(path, PATH_MAX, CPUS_TEMPLATE_UNCORE, sysfs, name);
630 cpus = __pmu_cpumask(path);
631 perf_cpu_map__put(cpus);
632
633 return !!cpus;
634 }
635
636 /*
637 * PMU CORE devices have different name other than cpu in sysfs on some
638 * platforms.
639 * Looking for possible sysfs files to identify the arm core device.
640 */
is_arm_pmu_core(const char * name)641 static int is_arm_pmu_core(const char *name)
642 {
643 struct stat st;
644 char path[PATH_MAX];
645 const char *sysfs = sysfs__mountpoint();
646
647 if (!sysfs)
648 return 0;
649
650 /* Look for cpu sysfs (specific to arm) */
651 scnprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/cpus",
652 sysfs, name);
653 if (stat(path, &st) == 0)
654 return 1;
655
656 return 0;
657 }
658
perf_pmu__getcpuid(struct perf_pmu * pmu)659 static char *perf_pmu__getcpuid(struct perf_pmu *pmu)
660 {
661 char *cpuid;
662 static bool printed;
663
664 cpuid = getenv("PERF_CPUID");
665 if (cpuid)
666 cpuid = strdup(cpuid);
667 if (!cpuid)
668 cpuid = get_cpuid_str(pmu);
669 if (!cpuid)
670 return NULL;
671
672 if (!printed) {
673 pr_debug("Using CPUID %s\n", cpuid);
674 printed = true;
675 }
676 return cpuid;
677 }
678
perf_pmu__find_map(struct perf_pmu * pmu)679 struct pmu_events_map *perf_pmu__find_map(struct perf_pmu *pmu)
680 {
681 struct pmu_events_map *map;
682 char *cpuid = perf_pmu__getcpuid(pmu);
683 int i;
684
685 /* on some platforms which uses cpus map, cpuid can be NULL for
686 * PMUs other than CORE PMUs.
687 */
688 if (!cpuid)
689 return NULL;
690
691 i = 0;
692 for (;;) {
693 map = &pmu_events_map[i++];
694 if (!map->table) {
695 map = NULL;
696 break;
697 }
698
699 if (!strcmp_cpuid_str(map->cpuid, cpuid))
700 break;
701 }
702 free(cpuid);
703 return map;
704 }
705
pmu_uncore_alias_match(const char * pmu_name,const char * name)706 static bool pmu_uncore_alias_match(const char *pmu_name, const char *name)
707 {
708 char *tmp = NULL, *tok, *str;
709 bool res;
710
711 str = strdup(pmu_name);
712 if (!str)
713 return false;
714
715 /*
716 * uncore alias may be from different PMU with common prefix
717 */
718 tok = strtok_r(str, ",", &tmp);
719 if (strncmp(pmu_name, tok, strlen(tok))) {
720 res = false;
721 goto out;
722 }
723
724 /*
725 * Match more complex aliases where the alias name is a comma-delimited
726 * list of tokens, orderly contained in the matching PMU name.
727 *
728 * Example: For alias "socket,pmuname" and PMU "socketX_pmunameY", we
729 * match "socket" in "socketX_pmunameY" and then "pmuname" in
730 * "pmunameY".
731 */
732 for (; tok; name += strlen(tok), tok = strtok_r(NULL, ",", &tmp)) {
733 name = strstr(name, tok);
734 if (!name) {
735 res = false;
736 goto out;
737 }
738 }
739
740 res = true;
741 out:
742 free(str);
743 return res;
744 }
745
746 /*
747 * From the pmu_events_map, find the table of PMU events that corresponds
748 * to the current running CPU. Then, add all PMU events from that table
749 * as aliases.
750 */
pmu_add_cpu_aliases(struct list_head * head,struct perf_pmu * pmu)751 static void pmu_add_cpu_aliases(struct list_head *head, struct perf_pmu *pmu)
752 {
753 int i;
754 struct pmu_events_map *map;
755 const char *name = pmu->name;
756
757 map = perf_pmu__find_map(pmu);
758 if (!map)
759 return;
760
761 /*
762 * Found a matching PMU events table. Create aliases
763 */
764 i = 0;
765 while (1) {
766 const char *cpu_name = is_arm_pmu_core(name) ? name : "cpu";
767 struct pmu_event *pe = &map->table[i++];
768 const char *pname = pe->pmu ? pe->pmu : cpu_name;
769
770 if (!pe->name) {
771 if (pe->metric_group || pe->metric_name)
772 continue;
773 break;
774 }
775
776 if (pmu_is_uncore(name) &&
777 pmu_uncore_alias_match(pname, name))
778 goto new_alias;
779
780 if (strcmp(pname, name))
781 continue;
782
783 new_alias:
784 /* need type casts to override 'const' */
785 __perf_pmu__new_alias(head, NULL, (char *)pe->name,
786 (char *)pe->desc, (char *)pe->event,
787 (char *)pe->long_desc, (char *)pe->topic,
788 (char *)pe->unit, (char *)pe->perpkg,
789 (char *)pe->metric_expr,
790 (char *)pe->metric_name);
791 }
792 }
793
794 struct perf_event_attr * __weak
perf_pmu__get_default_config(struct perf_pmu * pmu __maybe_unused)795 perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
796 {
797 return NULL;
798 }
799
pmu_max_precise(const char * name)800 static int pmu_max_precise(const char *name)
801 {
802 char path[PATH_MAX];
803 int max_precise = -1;
804
805 scnprintf(path, PATH_MAX,
806 "bus/event_source/devices/%s/caps/max_precise",
807 name);
808
809 sysfs__read_int(path, &max_precise);
810 return max_precise;
811 }
812
pmu_lookup(const char * name)813 static struct perf_pmu *pmu_lookup(const char *name)
814 {
815 struct perf_pmu *pmu;
816 LIST_HEAD(format);
817 LIST_HEAD(aliases);
818 __u32 type;
819
820 /*
821 * The pmu data we store & need consists of the pmu
822 * type value and format definitions. Load both right
823 * now.
824 */
825 if (pmu_format(name, &format))
826 return NULL;
827
828 /*
829 * Check the type first to avoid unnecessary work.
830 */
831 if (pmu_type(name, &type))
832 return NULL;
833
834 if (pmu_aliases(name, &aliases))
835 return NULL;
836
837 pmu = zalloc(sizeof(*pmu));
838 if (!pmu)
839 return NULL;
840
841 pmu->cpus = pmu_cpumask(name);
842 pmu->name = strdup(name);
843 pmu->type = type;
844 pmu->is_uncore = pmu_is_uncore(name);
845 pmu->max_precise = pmu_max_precise(name);
846 pmu_add_cpu_aliases(&aliases, pmu);
847
848 INIT_LIST_HEAD(&pmu->format);
849 INIT_LIST_HEAD(&pmu->aliases);
850 list_splice(&format, &pmu->format);
851 list_splice(&aliases, &pmu->aliases);
852 list_add_tail(&pmu->list, &pmus);
853
854 pmu->default_config = perf_pmu__get_default_config(pmu);
855
856 return pmu;
857 }
858
pmu_find(const char * name)859 static struct perf_pmu *pmu_find(const char *name)
860 {
861 struct perf_pmu *pmu;
862
863 list_for_each_entry(pmu, &pmus, list)
864 if (!strcmp(pmu->name, name))
865 return pmu;
866
867 return NULL;
868 }
869
perf_pmu__scan(struct perf_pmu * pmu)870 struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
871 {
872 /*
873 * pmu iterator: If pmu is NULL, we start at the begin,
874 * otherwise return the next pmu. Returns NULL on end.
875 */
876 if (!pmu) {
877 pmu_read_sysfs();
878 pmu = list_prepare_entry(pmu, &pmus, list);
879 }
880 list_for_each_entry_continue(pmu, &pmus, list)
881 return pmu;
882 return NULL;
883 }
884
perf_pmu__find(const char * name)885 struct perf_pmu *perf_pmu__find(const char *name)
886 {
887 struct perf_pmu *pmu;
888
889 /*
890 * Once PMU is loaded it stays in the list,
891 * so we keep us from multiple reading/parsing
892 * the pmu format definitions.
893 */
894 pmu = pmu_find(name);
895 if (pmu)
896 return pmu;
897
898 return pmu_lookup(name);
899 }
900
901 static struct perf_pmu_format *
pmu_find_format(struct list_head * formats,const char * name)902 pmu_find_format(struct list_head *formats, const char *name)
903 {
904 struct perf_pmu_format *format;
905
906 list_for_each_entry(format, formats, list)
907 if (!strcmp(format->name, name))
908 return format;
909
910 return NULL;
911 }
912
perf_pmu__format_bits(struct list_head * formats,const char * name)913 __u64 perf_pmu__format_bits(struct list_head *formats, const char *name)
914 {
915 struct perf_pmu_format *format = pmu_find_format(formats, name);
916 __u64 bits = 0;
917 int fbit;
918
919 if (!format)
920 return 0;
921
922 for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
923 bits |= 1ULL << fbit;
924
925 return bits;
926 }
927
928 /*
929 * Sets value based on the format definition (format parameter)
930 * and unformated value (value parameter).
931 */
pmu_format_value(unsigned long * format,__u64 value,__u64 * v,bool zero)932 static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
933 bool zero)
934 {
935 unsigned long fbit, vbit;
936
937 for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
938
939 if (!test_bit(fbit, format))
940 continue;
941
942 if (value & (1llu << vbit++))
943 *v |= (1llu << fbit);
944 else if (zero)
945 *v &= ~(1llu << fbit);
946 }
947 }
948
pmu_format_max_value(const unsigned long * format)949 static __u64 pmu_format_max_value(const unsigned long *format)
950 {
951 int w;
952
953 w = bitmap_weight(format, PERF_PMU_FORMAT_BITS);
954 if (!w)
955 return 0;
956 if (w < 64)
957 return (1ULL << w) - 1;
958 return -1;
959 }
960
961 /*
962 * Term is a string term, and might be a param-term. Try to look up it's value
963 * in the remaining terms.
964 * - We have a term like "base-or-format-term=param-term",
965 * - We need to find the value supplied for "param-term" (with param-term named
966 * in a config string) later on in the term list.
967 */
pmu_resolve_param_term(struct parse_events_term * term,struct list_head * head_terms,__u64 * value)968 static int pmu_resolve_param_term(struct parse_events_term *term,
969 struct list_head *head_terms,
970 __u64 *value)
971 {
972 struct parse_events_term *t;
973
974 list_for_each_entry(t, head_terms, list) {
975 if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
976 if (!strcmp(t->config, term->config)) {
977 t->used = true;
978 *value = t->val.num;
979 return 0;
980 }
981 }
982 }
983
984 if (verbose > 0)
985 printf("Required parameter '%s' not specified\n", term->config);
986
987 return -1;
988 }
989
pmu_formats_string(struct list_head * formats)990 static char *pmu_formats_string(struct list_head *formats)
991 {
992 struct perf_pmu_format *format;
993 char *str = NULL;
994 struct strbuf buf = STRBUF_INIT;
995 unsigned i = 0;
996
997 if (!formats)
998 return NULL;
999
1000 /* sysfs exported terms */
1001 list_for_each_entry(format, formats, list)
1002 if (strbuf_addf(&buf, i++ ? ",%s" : "%s", format->name) < 0)
1003 goto error;
1004
1005 str = strbuf_detach(&buf, NULL);
1006 error:
1007 strbuf_release(&buf);
1008
1009 return str;
1010 }
1011
1012 /*
1013 * Setup one of config[12] attr members based on the
1014 * user input data - term parameter.
1015 */
pmu_config_term(struct list_head * formats,struct perf_event_attr * attr,struct parse_events_term * term,struct list_head * head_terms,bool zero,struct parse_events_error * err)1016 static int pmu_config_term(struct list_head *formats,
1017 struct perf_event_attr *attr,
1018 struct parse_events_term *term,
1019 struct list_head *head_terms,
1020 bool zero, struct parse_events_error *err)
1021 {
1022 struct perf_pmu_format *format;
1023 __u64 *vp;
1024 __u64 val, max_val;
1025
1026 /*
1027 * If this is a parameter we've already used for parameterized-eval,
1028 * skip it in normal eval.
1029 */
1030 if (term->used)
1031 return 0;
1032
1033 /*
1034 * Hardcoded terms should be already in, so nothing
1035 * to be done for them.
1036 */
1037 if (parse_events__is_hardcoded_term(term))
1038 return 0;
1039
1040 format = pmu_find_format(formats, term->config);
1041 if (!format) {
1042 if (verbose > 0)
1043 printf("Invalid event/parameter '%s'\n", term->config);
1044 if (err) {
1045 char *pmu_term = pmu_formats_string(formats);
1046
1047 err->idx = term->err_term;
1048 err->str = strdup("unknown term");
1049 err->help = parse_events_formats_error_string(pmu_term);
1050 free(pmu_term);
1051 }
1052 return -EINVAL;
1053 }
1054
1055 switch (format->value) {
1056 case PERF_PMU_FORMAT_VALUE_CONFIG:
1057 vp = &attr->config;
1058 break;
1059 case PERF_PMU_FORMAT_VALUE_CONFIG1:
1060 vp = &attr->config1;
1061 break;
1062 case PERF_PMU_FORMAT_VALUE_CONFIG2:
1063 vp = &attr->config2;
1064 break;
1065 default:
1066 return -EINVAL;
1067 }
1068
1069 /*
1070 * Either directly use a numeric term, or try to translate string terms
1071 * using event parameters.
1072 */
1073 if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
1074 if (term->no_value &&
1075 bitmap_weight(format->bits, PERF_PMU_FORMAT_BITS) > 1) {
1076 if (err) {
1077 err->idx = term->err_val;
1078 err->str = strdup("no value assigned for term");
1079 }
1080 return -EINVAL;
1081 }
1082
1083 val = term->val.num;
1084 } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
1085 if (strcmp(term->val.str, "?")) {
1086 if (verbose > 0) {
1087 pr_info("Invalid sysfs entry %s=%s\n",
1088 term->config, term->val.str);
1089 }
1090 if (err) {
1091 err->idx = term->err_val;
1092 err->str = strdup("expected numeric value");
1093 }
1094 return -EINVAL;
1095 }
1096
1097 if (pmu_resolve_param_term(term, head_terms, &val))
1098 return -EINVAL;
1099 } else
1100 return -EINVAL;
1101
1102 max_val = pmu_format_max_value(format->bits);
1103 if (val > max_val) {
1104 if (err) {
1105 err->idx = term->err_val;
1106 if (asprintf(&err->str,
1107 "value too big for format, maximum is %llu",
1108 (unsigned long long)max_val) < 0)
1109 err->str = strdup("value too big for format");
1110 return -EINVAL;
1111 }
1112 /*
1113 * Assume we don't care if !err, in which case the value will be
1114 * silently truncated.
1115 */
1116 }
1117
1118 pmu_format_value(format->bits, val, vp, zero);
1119 return 0;
1120 }
1121
perf_pmu__config_terms(struct list_head * formats,struct perf_event_attr * attr,struct list_head * head_terms,bool zero,struct parse_events_error * err)1122 int perf_pmu__config_terms(struct list_head *formats,
1123 struct perf_event_attr *attr,
1124 struct list_head *head_terms,
1125 bool zero, struct parse_events_error *err)
1126 {
1127 struct parse_events_term *term;
1128
1129 list_for_each_entry(term, head_terms, list) {
1130 if (pmu_config_term(formats, attr, term, head_terms,
1131 zero, err))
1132 return -EINVAL;
1133 }
1134
1135 return 0;
1136 }
1137
1138 /*
1139 * Configures event's 'attr' parameter based on the:
1140 * 1) users input - specified in terms parameter
1141 * 2) pmu format definitions - specified by pmu parameter
1142 */
perf_pmu__config(struct perf_pmu * pmu,struct perf_event_attr * attr,struct list_head * head_terms,struct parse_events_error * err)1143 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
1144 struct list_head *head_terms,
1145 struct parse_events_error *err)
1146 {
1147 bool zero = !!pmu->default_config;
1148
1149 attr->type = pmu->type;
1150 return perf_pmu__config_terms(&pmu->format, attr, head_terms,
1151 zero, err);
1152 }
1153
pmu_find_alias(struct perf_pmu * pmu,struct parse_events_term * term)1154 static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
1155 struct parse_events_term *term)
1156 {
1157 struct perf_pmu_alias *alias;
1158 char *name;
1159
1160 if (parse_events__is_hardcoded_term(term))
1161 return NULL;
1162
1163 if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
1164 if (term->val.num != 1)
1165 return NULL;
1166 if (pmu_find_format(&pmu->format, term->config))
1167 return NULL;
1168 name = term->config;
1169 } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
1170 if (strcasecmp(term->config, "event"))
1171 return NULL;
1172 name = term->val.str;
1173 } else {
1174 return NULL;
1175 }
1176
1177 list_for_each_entry(alias, &pmu->aliases, list) {
1178 if (!strcasecmp(alias->name, name))
1179 return alias;
1180 }
1181 return NULL;
1182 }
1183
1184
check_info_data(struct perf_pmu_alias * alias,struct perf_pmu_info * info)1185 static int check_info_data(struct perf_pmu_alias *alias,
1186 struct perf_pmu_info *info)
1187 {
1188 /*
1189 * Only one term in event definition can
1190 * define unit, scale and snapshot, fail
1191 * if there's more than one.
1192 */
1193 if ((info->unit && alias->unit[0]) ||
1194 (info->scale && alias->scale) ||
1195 (info->snapshot && alias->snapshot))
1196 return -EINVAL;
1197
1198 if (alias->unit[0])
1199 info->unit = alias->unit;
1200
1201 if (alias->scale)
1202 info->scale = alias->scale;
1203
1204 if (alias->snapshot)
1205 info->snapshot = alias->snapshot;
1206
1207 return 0;
1208 }
1209
1210 /*
1211 * Find alias in the terms list and replace it with the terms
1212 * defined for the alias
1213 */
perf_pmu__check_alias(struct perf_pmu * pmu,struct list_head * head_terms,struct perf_pmu_info * info)1214 int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
1215 struct perf_pmu_info *info)
1216 {
1217 struct parse_events_term *term, *h;
1218 struct perf_pmu_alias *alias;
1219 int ret;
1220
1221 info->per_pkg = false;
1222
1223 /*
1224 * Mark unit and scale as not set
1225 * (different from default values, see below)
1226 */
1227 info->unit = NULL;
1228 info->scale = 0.0;
1229 info->snapshot = false;
1230 info->metric_expr = NULL;
1231 info->metric_name = NULL;
1232
1233 list_for_each_entry_safe(term, h, head_terms, list) {
1234 alias = pmu_find_alias(pmu, term);
1235 if (!alias)
1236 continue;
1237 ret = pmu_alias_terms(alias, &term->list);
1238 if (ret)
1239 return ret;
1240
1241 ret = check_info_data(alias, info);
1242 if (ret)
1243 return ret;
1244
1245 if (alias->per_pkg)
1246 info->per_pkg = true;
1247 info->metric_expr = alias->metric_expr;
1248 info->metric_name = alias->metric_name;
1249
1250 list_del_init(&term->list);
1251 free(term);
1252 }
1253
1254 /*
1255 * if no unit or scale foundin aliases, then
1256 * set defaults as for evsel
1257 * unit cannot left to NULL
1258 */
1259 if (info->unit == NULL)
1260 info->unit = "";
1261
1262 if (info->scale == 0.0)
1263 info->scale = 1.0;
1264
1265 return 0;
1266 }
1267
perf_pmu__new_format(struct list_head * list,char * name,int config,unsigned long * bits)1268 int perf_pmu__new_format(struct list_head *list, char *name,
1269 int config, unsigned long *bits)
1270 {
1271 struct perf_pmu_format *format;
1272
1273 format = zalloc(sizeof(*format));
1274 if (!format)
1275 return -ENOMEM;
1276
1277 format->name = strdup(name);
1278 format->value = config;
1279 memcpy(format->bits, bits, sizeof(format->bits));
1280
1281 list_add_tail(&format->list, list);
1282 return 0;
1283 }
1284
perf_pmu__set_format(unsigned long * bits,long from,long to)1285 void perf_pmu__set_format(unsigned long *bits, long from, long to)
1286 {
1287 long b;
1288
1289 if (!to)
1290 to = from;
1291
1292 memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
1293 for (b = from; b <= to; b++)
1294 set_bit(b, bits);
1295 }
1296
perf_pmu__del_formats(struct list_head * formats)1297 void perf_pmu__del_formats(struct list_head *formats)
1298 {
1299 struct perf_pmu_format *fmt, *tmp;
1300
1301 list_for_each_entry_safe(fmt, tmp, formats, list) {
1302 list_del(&fmt->list);
1303 free(fmt->name);
1304 free(fmt);
1305 }
1306 }
1307
sub_non_neg(int a,int b)1308 static int sub_non_neg(int a, int b)
1309 {
1310 if (b > a)
1311 return 0;
1312 return a - b;
1313 }
1314
format_alias(char * buf,int len,struct perf_pmu * pmu,struct perf_pmu_alias * alias)1315 static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
1316 struct perf_pmu_alias *alias)
1317 {
1318 struct parse_events_term *term;
1319 int used = snprintf(buf, len, "%s/%s", pmu->name, alias->name);
1320
1321 list_for_each_entry(term, &alias->terms, list) {
1322 if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
1323 used += snprintf(buf + used, sub_non_neg(len, used),
1324 ",%s=%s", term->config,
1325 term->val.str);
1326 }
1327
1328 if (sub_non_neg(len, used) > 0) {
1329 buf[used] = '/';
1330 used++;
1331 }
1332 if (sub_non_neg(len, used) > 0) {
1333 buf[used] = '\0';
1334 used++;
1335 } else
1336 buf[len - 1] = '\0';
1337
1338 return buf;
1339 }
1340
format_alias_or(char * buf,int len,struct perf_pmu * pmu,struct perf_pmu_alias * alias)1341 static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
1342 struct perf_pmu_alias *alias)
1343 {
1344 snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
1345 return buf;
1346 }
1347
1348 struct sevent {
1349 char *name;
1350 char *desc;
1351 char *topic;
1352 char *str;
1353 char *pmu;
1354 char *metric_expr;
1355 char *metric_name;
1356 };
1357
cmp_sevent(const void * a,const void * b)1358 static int cmp_sevent(const void *a, const void *b)
1359 {
1360 const struct sevent *as = a;
1361 const struct sevent *bs = b;
1362
1363 /* Put extra events last */
1364 if (!!as->desc != !!bs->desc)
1365 return !!as->desc - !!bs->desc;
1366 if (as->topic && bs->topic) {
1367 int n = strcmp(as->topic, bs->topic);
1368
1369 if (n)
1370 return n;
1371 }
1372 return strcmp(as->name, bs->name);
1373 }
1374
wordwrap(char * s,int start,int max,int corr)1375 static void wordwrap(char *s, int start, int max, int corr)
1376 {
1377 int column = start;
1378 int n;
1379
1380 while (*s) {
1381 int wlen = strcspn(s, " \t");
1382
1383 if (column + wlen >= max && column > start) {
1384 printf("\n%*s", start, "");
1385 column = start + corr;
1386 }
1387 n = printf("%s%.*s", column > start ? " " : "", wlen, s);
1388 if (n <= 0)
1389 break;
1390 s += wlen;
1391 column += n;
1392 s = skip_spaces(s);
1393 }
1394 }
1395
print_pmu_events(const char * event_glob,bool name_only,bool quiet_flag,bool long_desc,bool details_flag)1396 void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
1397 bool long_desc, bool details_flag)
1398 {
1399 struct perf_pmu *pmu;
1400 struct perf_pmu_alias *alias;
1401 char buf[1024];
1402 int printed = 0;
1403 int len, j;
1404 struct sevent *aliases;
1405 int numdesc = 0;
1406 int columns = pager_get_columns();
1407 char *topic = NULL;
1408
1409 pmu = NULL;
1410 len = 0;
1411 while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1412 list_for_each_entry(alias, &pmu->aliases, list)
1413 len++;
1414 if (pmu->selectable)
1415 len++;
1416 }
1417 aliases = zalloc(sizeof(struct sevent) * len);
1418 if (!aliases)
1419 goto out_enomem;
1420 pmu = NULL;
1421 j = 0;
1422 while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1423 list_for_each_entry(alias, &pmu->aliases, list) {
1424 char *name = alias->desc ? alias->name :
1425 format_alias(buf, sizeof(buf), pmu, alias);
1426 bool is_cpu = !strcmp(pmu->name, "cpu");
1427
1428 if (event_glob != NULL &&
1429 !(strglobmatch_nocase(name, event_glob) ||
1430 (!is_cpu && strglobmatch_nocase(alias->name,
1431 event_glob)) ||
1432 (alias->topic &&
1433 strglobmatch_nocase(alias->topic, event_glob))))
1434 continue;
1435
1436 if (is_cpu && !name_only && !alias->desc)
1437 name = format_alias_or(buf, sizeof(buf), pmu, alias);
1438
1439 aliases[j].name = name;
1440 if (is_cpu && !name_only && !alias->desc)
1441 aliases[j].name = format_alias_or(buf,
1442 sizeof(buf),
1443 pmu, alias);
1444 aliases[j].name = strdup(aliases[j].name);
1445 if (!aliases[j].name)
1446 goto out_enomem;
1447
1448 aliases[j].desc = long_desc ? alias->long_desc :
1449 alias->desc;
1450 aliases[j].topic = alias->topic;
1451 aliases[j].str = alias->str;
1452 aliases[j].pmu = pmu->name;
1453 aliases[j].metric_expr = alias->metric_expr;
1454 aliases[j].metric_name = alias->metric_name;
1455 j++;
1456 }
1457 if (pmu->selectable &&
1458 (event_glob == NULL || strglobmatch(pmu->name, event_glob))) {
1459 char *s;
1460 if (asprintf(&s, "%s//", pmu->name) < 0)
1461 goto out_enomem;
1462 aliases[j].name = s;
1463 j++;
1464 }
1465 }
1466 len = j;
1467 qsort(aliases, len, sizeof(struct sevent), cmp_sevent);
1468 for (j = 0; j < len; j++) {
1469 /* Skip duplicates */
1470 if (j > 0 && !strcmp(aliases[j].name, aliases[j - 1].name))
1471 continue;
1472 if (name_only) {
1473 printf("%s ", aliases[j].name);
1474 continue;
1475 }
1476 if (aliases[j].desc && !quiet_flag) {
1477 if (numdesc++ == 0)
1478 printf("\n");
1479 if (aliases[j].topic && (!topic ||
1480 strcmp(topic, aliases[j].topic))) {
1481 printf("%s%s:\n", topic ? "\n" : "",
1482 aliases[j].topic);
1483 topic = aliases[j].topic;
1484 }
1485 printf(" %-50s\n", aliases[j].name);
1486 printf("%*s", 8, "[");
1487 wordwrap(aliases[j].desc, 8, columns, 0);
1488 printf("]\n");
1489 if (details_flag) {
1490 printf("%*s%s/%s/ ", 8, "", aliases[j].pmu, aliases[j].str);
1491 if (aliases[j].metric_name)
1492 printf(" MetricName: %s", aliases[j].metric_name);
1493 if (aliases[j].metric_expr)
1494 printf(" MetricExpr: %s", aliases[j].metric_expr);
1495 putchar('\n');
1496 }
1497 } else
1498 printf(" %-50s [Kernel PMU event]\n", aliases[j].name);
1499 printed++;
1500 }
1501 if (printed && pager_in_use())
1502 printf("\n");
1503 out_free:
1504 for (j = 0; j < len; j++)
1505 zfree(&aliases[j].name);
1506 zfree(&aliases);
1507 return;
1508
1509 out_enomem:
1510 printf("FATAL: not enough memory to print PMU events\n");
1511 if (aliases)
1512 goto out_free;
1513 }
1514
pmu_have_event(const char * pname,const char * name)1515 bool pmu_have_event(const char *pname, const char *name)
1516 {
1517 struct perf_pmu *pmu;
1518 struct perf_pmu_alias *alias;
1519
1520 pmu = NULL;
1521 while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1522 if (strcmp(pname, pmu->name))
1523 continue;
1524 list_for_each_entry(alias, &pmu->aliases, list)
1525 if (!strcmp(alias->name, name))
1526 return true;
1527 }
1528 return false;
1529 }
1530
perf_pmu__open_file(struct perf_pmu * pmu,const char * name)1531 static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
1532 {
1533 struct stat st;
1534 char path[PATH_MAX];
1535 const char *sysfs;
1536
1537 sysfs = sysfs__mountpoint();
1538 if (!sysfs)
1539 return NULL;
1540
1541 snprintf(path, PATH_MAX,
1542 "%s" EVENT_SOURCE_DEVICE_PATH "%s/%s", sysfs, pmu->name, name);
1543
1544 if (stat(path, &st) < 0)
1545 return NULL;
1546
1547 return fopen(path, "r");
1548 }
1549
perf_pmu__scan_file(struct perf_pmu * pmu,const char * name,const char * fmt,...)1550 int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
1551 ...)
1552 {
1553 va_list args;
1554 FILE *file;
1555 int ret = EOF;
1556
1557 va_start(args, fmt);
1558 file = perf_pmu__open_file(pmu, name);
1559 if (file) {
1560 ret = vfscanf(file, fmt, args);
1561 fclose(file);
1562 }
1563 va_end(args);
1564 return ret;
1565 }
1566