Merge tag '6.9-rc-smb3-client-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6
[linux-2.6-block.git] / tools / perf / util / pmu.c
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 <linux/ctype.h>
7 #include <sys/types.h>
8 #include <fcntl.h>
9 #include <sys/stat.h>
10 #include <unistd.h>
11 #include <stdio.h>
12 #include <stdbool.h>
13 #include <dirent.h>
14 #include <api/fs/fs.h>
15 #include <locale.h>
16 #include <fnmatch.h>
17 #include <math.h>
18 #include "debug.h"
19 #include "evsel.h"
20 #include "pmu.h"
21 #include "pmus.h"
22 #include <util/pmu-bison.h>
23 #include <util/pmu-flex.h>
24 #include "parse-events.h"
25 #include "print-events.h"
26 #include "header.h"
27 #include "string2.h"
28 #include "strbuf.h"
29 #include "fncache.h"
30 #include "util/evsel_config.h"
31 #include <regex.h>
32
33 struct perf_pmu perf_pmu__fake = {
34         .name = "fake",
35 };
36
37 #define UNIT_MAX_LEN    31 /* max length for event unit name */
38
39 /**
40  * struct perf_pmu_alias - An event either read from sysfs or builtin in
41  * pmu-events.c, created by parsing the pmu-events json files.
42  */
43 struct perf_pmu_alias {
44         /** @name: Name of the event like "mem-loads". */
45         char *name;
46         /** @desc: Optional short description of the event. */
47         char *desc;
48         /** @long_desc: Optional long description. */
49         char *long_desc;
50         /**
51          * @topic: Optional topic such as cache or pipeline, particularly for
52          * json events.
53          */
54         char *topic;
55         /** @terms: Owned list of the original parsed parameters. */
56         struct parse_events_terms terms;
57         /** @list: List element of struct perf_pmu aliases. */
58         struct list_head list;
59         /**
60          * @pmu_name: The name copied from the json struct pmu_event. This can
61          * differ from the PMU name as it won't have suffixes.
62          */
63         char *pmu_name;
64         /** @unit: Units for the event, such as bytes or cache lines. */
65         char unit[UNIT_MAX_LEN+1];
66         /** @scale: Value to scale read counter values by. */
67         double scale;
68         /**
69          * @per_pkg: Does the file
70          * <sysfs>/bus/event_source/devices/<pmu_name>/events/<name>.per-pkg or
71          * equivalent json value exist and have the value 1.
72          */
73         bool per_pkg;
74         /**
75          * @snapshot: Does the file
76          * <sysfs>/bus/event_source/devices/<pmu_name>/events/<name>.snapshot
77          * exist and have the value 1.
78          */
79         bool snapshot;
80         /**
81          * @deprecated: Is the event hidden and so not shown in perf list by
82          * default.
83          */
84         bool deprecated;
85         /** @from_sysfs: Was the alias from sysfs or a json event? */
86         bool from_sysfs;
87         /** @info_loaded: Have the scale, unit and other values been read from disk? */
88         bool info_loaded;
89 };
90
91 /**
92  * struct perf_pmu_format - Values from a format file read from
93  * <sysfs>/devices/cpu/format/ held in struct perf_pmu.
94  *
95  * For example, the contents of <sysfs>/devices/cpu/format/event may be
96  * "config:0-7" and will be represented here as name="event",
97  * value=PERF_PMU_FORMAT_VALUE_CONFIG and bits 0 to 7 will be set.
98  */
99 struct perf_pmu_format {
100         /** @list: Element on list within struct perf_pmu. */
101         struct list_head list;
102         /** @bits: Which config bits are set by this format value. */
103         DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
104         /** @name: The modifier/file name. */
105         char *name;
106         /**
107          * @value : Which config value the format relates to. Supported values
108          * are from PERF_PMU_FORMAT_VALUE_CONFIG to
109          * PERF_PMU_FORMAT_VALUE_CONFIG_END.
110          */
111         u16 value;
112         /** @loaded: Has the contents been loaded/parsed. */
113         bool loaded;
114 };
115
116 static int pmu_aliases_parse(struct perf_pmu *pmu);
117
118 static struct perf_pmu_format *perf_pmu__new_format(struct list_head *list, char *name)
119 {
120         struct perf_pmu_format *format;
121
122         format = zalloc(sizeof(*format));
123         if (!format)
124                 return NULL;
125
126         format->name = strdup(name);
127         if (!format->name) {
128                 free(format);
129                 return NULL;
130         }
131         list_add_tail(&format->list, list);
132         return format;
133 }
134
135 /* Called at the end of parsing a format. */
136 void perf_pmu_format__set_value(void *vformat, int config, unsigned long *bits)
137 {
138         struct perf_pmu_format *format = vformat;
139
140         format->value = config;
141         memcpy(format->bits, bits, sizeof(format->bits));
142 }
143
144 static void __perf_pmu_format__load(struct perf_pmu_format *format, FILE *file)
145 {
146         void *scanner;
147         int ret;
148
149         ret = perf_pmu_lex_init(&scanner);
150         if (ret)
151                 return;
152
153         perf_pmu_set_in(file, scanner);
154         ret = perf_pmu_parse(format, scanner);
155         perf_pmu_lex_destroy(scanner);
156         format->loaded = true;
157 }
158
159 static void perf_pmu_format__load(const struct perf_pmu *pmu, struct perf_pmu_format *format)
160 {
161         char path[PATH_MAX];
162         FILE *file = NULL;
163
164         if (format->loaded)
165                 return;
166
167         if (!perf_pmu__pathname_scnprintf(path, sizeof(path), pmu->name, "format"))
168                 return;
169
170         assert(strlen(path) + strlen(format->name) + 2 < sizeof(path));
171         strcat(path, "/");
172         strcat(path, format->name);
173
174         file = fopen(path, "r");
175         if (!file)
176                 return;
177         __perf_pmu_format__load(format, file);
178         fclose(file);
179 }
180
181 /*
182  * Parse & process all the sysfs attributes located under
183  * the directory specified in 'dir' parameter.
184  */
185 int perf_pmu__format_parse(struct perf_pmu *pmu, int dirfd, bool eager_load)
186 {
187         struct dirent *evt_ent;
188         DIR *format_dir;
189         int ret = 0;
190
191         format_dir = fdopendir(dirfd);
192         if (!format_dir)
193                 return -EINVAL;
194
195         while ((evt_ent = readdir(format_dir)) != NULL) {
196                 struct perf_pmu_format *format;
197                 char *name = evt_ent->d_name;
198
199                 if (!strcmp(name, ".") || !strcmp(name, ".."))
200                         continue;
201
202                 format = perf_pmu__new_format(&pmu->format, name);
203                 if (!format) {
204                         ret = -ENOMEM;
205                         break;
206                 }
207
208                 if (eager_load) {
209                         FILE *file;
210                         int fd = openat(dirfd, name, O_RDONLY);
211
212                         if (fd < 0) {
213                                 ret = -errno;
214                                 break;
215                         }
216                         file = fdopen(fd, "r");
217                         if (!file) {
218                                 close(fd);
219                                 break;
220                         }
221                         __perf_pmu_format__load(format, file);
222                         fclose(file);
223                 }
224         }
225
226         closedir(format_dir);
227         return ret;
228 }
229
230 /*
231  * Reading/parsing the default pmu format definition, which should be
232  * located at:
233  * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
234  */
235 static int pmu_format(struct perf_pmu *pmu, int dirfd, const char *name)
236 {
237         int fd;
238
239         fd = perf_pmu__pathname_fd(dirfd, name, "format", O_DIRECTORY);
240         if (fd < 0)
241                 return 0;
242
243         /* it'll close the fd */
244         if (perf_pmu__format_parse(pmu, fd, /*eager_load=*/false))
245                 return -1;
246
247         return 0;
248 }
249
250 int perf_pmu__convert_scale(const char *scale, char **end, double *sval)
251 {
252         char *lc;
253         int ret = 0;
254
255         /*
256          * save current locale
257          */
258         lc = setlocale(LC_NUMERIC, NULL);
259
260         /*
261          * The lc string may be allocated in static storage,
262          * so get a dynamic copy to make it survive setlocale
263          * call below.
264          */
265         lc = strdup(lc);
266         if (!lc) {
267                 ret = -ENOMEM;
268                 goto out;
269         }
270
271         /*
272          * force to C locale to ensure kernel
273          * scale string is converted correctly.
274          * kernel uses default C locale.
275          */
276         setlocale(LC_NUMERIC, "C");
277
278         *sval = strtod(scale, end);
279
280 out:
281         /* restore locale */
282         setlocale(LC_NUMERIC, lc);
283         free(lc);
284         return ret;
285 }
286
287 static int perf_pmu__parse_scale(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
288 {
289         struct stat st;
290         ssize_t sret;
291         size_t len;
292         char scale[128];
293         int fd, ret = -1;
294         char path[PATH_MAX];
295
296         len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
297         if (!len)
298                 return 0;
299         scnprintf(path + len, sizeof(path) - len, "%s/events/%s.scale", pmu->name, alias->name);
300
301         fd = open(path, O_RDONLY);
302         if (fd == -1)
303                 return -1;
304
305         if (fstat(fd, &st) < 0)
306                 goto error;
307
308         sret = read(fd, scale, sizeof(scale)-1);
309         if (sret < 0)
310                 goto error;
311
312         if (scale[sret - 1] == '\n')
313                 scale[sret - 1] = '\0';
314         else
315                 scale[sret] = '\0';
316
317         ret = perf_pmu__convert_scale(scale, NULL, &alias->scale);
318 error:
319         close(fd);
320         return ret;
321 }
322
323 static int perf_pmu__parse_unit(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
324 {
325         char path[PATH_MAX];
326         size_t len;
327         ssize_t sret;
328         int fd;
329
330
331         len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
332         if (!len)
333                 return 0;
334         scnprintf(path + len, sizeof(path) - len, "%s/events/%s.unit", pmu->name, alias->name);
335
336         fd = open(path, O_RDONLY);
337         if (fd == -1)
338                 return -1;
339
340         sret = read(fd, alias->unit, UNIT_MAX_LEN);
341         if (sret < 0)
342                 goto error;
343
344         close(fd);
345
346         if (alias->unit[sret - 1] == '\n')
347                 alias->unit[sret - 1] = '\0';
348         else
349                 alias->unit[sret] = '\0';
350
351         return 0;
352 error:
353         close(fd);
354         alias->unit[0] = '\0';
355         return -1;
356 }
357
358 static int
359 perf_pmu__parse_per_pkg(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
360 {
361         char path[PATH_MAX];
362         size_t len;
363         int fd;
364
365         len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
366         if (!len)
367                 return 0;
368         scnprintf(path + len, sizeof(path) - len, "%s/events/%s.per-pkg", pmu->name, alias->name);
369
370         fd = open(path, O_RDONLY);
371         if (fd == -1)
372                 return -1;
373
374         close(fd);
375
376         alias->per_pkg = true;
377         return 0;
378 }
379
380 static int perf_pmu__parse_snapshot(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
381 {
382         char path[PATH_MAX];
383         size_t len;
384         int fd;
385
386         len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
387         if (!len)
388                 return 0;
389         scnprintf(path + len, sizeof(path) - len, "%s/events/%s.snapshot", pmu->name, alias->name);
390
391         fd = open(path, O_RDONLY);
392         if (fd == -1)
393                 return -1;
394
395         alias->snapshot = true;
396         close(fd);
397         return 0;
398 }
399
400 /* Delete an alias entry. */
401 static void perf_pmu_free_alias(struct perf_pmu_alias *newalias)
402 {
403         zfree(&newalias->name);
404         zfree(&newalias->desc);
405         zfree(&newalias->long_desc);
406         zfree(&newalias->topic);
407         zfree(&newalias->pmu_name);
408         parse_events_terms__exit(&newalias->terms);
409         free(newalias);
410 }
411
412 static void perf_pmu__del_aliases(struct perf_pmu *pmu)
413 {
414         struct perf_pmu_alias *alias, *tmp;
415
416         list_for_each_entry_safe(alias, tmp, &pmu->aliases, list) {
417                 list_del(&alias->list);
418                 perf_pmu_free_alias(alias);
419         }
420 }
421
422 static struct perf_pmu_alias *perf_pmu__find_alias(struct perf_pmu *pmu,
423                                                    const char *name,
424                                                    bool load)
425 {
426         struct perf_pmu_alias *alias;
427
428         if (load && !pmu->sysfs_aliases_loaded)
429                 pmu_aliases_parse(pmu);
430
431         list_for_each_entry(alias, &pmu->aliases, list) {
432                 if (!strcasecmp(alias->name, name))
433                         return alias;
434         }
435         return NULL;
436 }
437
438 static bool assign_str(const char *name, const char *field, char **old_str,
439                                 const char *new_str)
440 {
441         if (!*old_str && new_str) {
442                 *old_str = strdup(new_str);
443                 return true;
444         }
445
446         if (!new_str || !strcasecmp(*old_str, new_str))
447                 return false; /* Nothing to update. */
448
449         pr_debug("alias %s differs in field '%s' ('%s' != '%s')\n",
450                 name, field, *old_str, new_str);
451         zfree(old_str);
452         *old_str = strdup(new_str);
453         return true;
454 }
455
456 static void read_alias_info(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
457 {
458         if (!alias->from_sysfs || alias->info_loaded)
459                 return;
460
461         /*
462          * load unit name and scale if available
463          */
464         perf_pmu__parse_unit(pmu, alias);
465         perf_pmu__parse_scale(pmu, alias);
466         perf_pmu__parse_per_pkg(pmu, alias);
467         perf_pmu__parse_snapshot(pmu, alias);
468 }
469
470 struct update_alias_data {
471         struct perf_pmu *pmu;
472         struct perf_pmu_alias *alias;
473 };
474
475 static int update_alias(const struct pmu_event *pe,
476                         const struct pmu_events_table *table __maybe_unused,
477                         void *vdata)
478 {
479         struct update_alias_data *data = vdata;
480         int ret = 0;
481
482         read_alias_info(data->pmu, data->alias);
483         assign_str(pe->name, "desc", &data->alias->desc, pe->desc);
484         assign_str(pe->name, "long_desc", &data->alias->long_desc, pe->long_desc);
485         assign_str(pe->name, "topic", &data->alias->topic, pe->topic);
486         data->alias->per_pkg = pe->perpkg;
487         if (pe->event) {
488                 parse_events_terms__exit(&data->alias->terms);
489                 ret = parse_events_terms(&data->alias->terms, pe->event, /*input=*/NULL);
490         }
491         if (!ret && pe->unit) {
492                 char *unit;
493
494                 ret = perf_pmu__convert_scale(pe->unit, &unit, &data->alias->scale);
495                 if (!ret)
496                         snprintf(data->alias->unit, sizeof(data->alias->unit), "%s", unit);
497         }
498         return ret;
499 }
500
501 static int perf_pmu__new_alias(struct perf_pmu *pmu, const char *name,
502                                 const char *desc, const char *val, FILE *val_fd,
503                                 const struct pmu_event *pe)
504 {
505         struct perf_pmu_alias *alias;
506         int ret;
507         const char *long_desc = NULL, *topic = NULL, *unit = NULL, *pmu_name = NULL;
508         bool deprecated = false, perpkg = false;
509
510         if (perf_pmu__find_alias(pmu, name, /*load=*/ false)) {
511                 /* Alias was already created/loaded. */
512                 return 0;
513         }
514
515         if (pe) {
516                 long_desc = pe->long_desc;
517                 topic = pe->topic;
518                 unit = pe->unit;
519                 perpkg = pe->perpkg;
520                 deprecated = pe->deprecated;
521                 pmu_name = pe->pmu;
522         }
523
524         alias = zalloc(sizeof(*alias));
525         if (!alias)
526                 return -ENOMEM;
527
528         parse_events_terms__init(&alias->terms);
529         alias->scale = 1.0;
530         alias->unit[0] = '\0';
531         alias->per_pkg = perpkg;
532         alias->snapshot = false;
533         alias->deprecated = deprecated;
534
535         ret = parse_events_terms(&alias->terms, val, val_fd);
536         if (ret) {
537                 pr_err("Cannot parse alias %s: %d\n", val, ret);
538                 free(alias);
539                 return ret;
540         }
541
542         alias->name = strdup(name);
543         alias->desc = desc ? strdup(desc) : NULL;
544         alias->long_desc = long_desc ? strdup(long_desc) :
545                                 desc ? strdup(desc) : NULL;
546         alias->topic = topic ? strdup(topic) : NULL;
547         alias->pmu_name = pmu_name ? strdup(pmu_name) : NULL;
548         if (unit) {
549                 if (perf_pmu__convert_scale(unit, (char **)&unit, &alias->scale) < 0) {
550                         perf_pmu_free_alias(alias);
551                         return -1;
552                 }
553                 snprintf(alias->unit, sizeof(alias->unit), "%s", unit);
554         }
555         if (!pe) {
556                 /* Update an event from sysfs with json data. */
557                 struct update_alias_data data = {
558                         .pmu = pmu,
559                         .alias = alias,
560                 };
561
562                 alias->from_sysfs = true;
563                 if (pmu->events_table) {
564                         if (pmu_events_table__find_event(pmu->events_table, pmu, name,
565                                                          update_alias, &data) == 0)
566                                 pmu->loaded_json_aliases++;
567                 }
568         }
569
570         if (!pe)
571                 pmu->sysfs_aliases++;
572         else
573                 pmu->loaded_json_aliases++;
574         list_add_tail(&alias->list, &pmu->aliases);
575         return 0;
576 }
577
578 static inline bool pmu_alias_info_file(const char *name)
579 {
580         size_t len;
581
582         len = strlen(name);
583         if (len > 5 && !strcmp(name + len - 5, ".unit"))
584                 return true;
585         if (len > 6 && !strcmp(name + len - 6, ".scale"))
586                 return true;
587         if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
588                 return true;
589         if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
590                 return true;
591
592         return false;
593 }
594
595 /*
596  * Reading the pmu event aliases definition, which should be located at:
597  * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
598  */
599 static int pmu_aliases_parse(struct perf_pmu *pmu)
600 {
601         char path[PATH_MAX];
602         struct dirent *evt_ent;
603         DIR *event_dir;
604         size_t len;
605         int fd, dir_fd;
606
607         len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
608         if (!len)
609                 return 0;
610         scnprintf(path + len, sizeof(path) - len, "%s/events", pmu->name);
611
612         dir_fd = open(path, O_DIRECTORY);
613         if (dir_fd == -1) {
614                 pmu->sysfs_aliases_loaded = true;
615                 return 0;
616         }
617
618         event_dir = fdopendir(dir_fd);
619         if (!event_dir){
620                 close (dir_fd);
621                 return -EINVAL;
622         }
623
624         while ((evt_ent = readdir(event_dir))) {
625                 char *name = evt_ent->d_name;
626                 FILE *file;
627
628                 if (!strcmp(name, ".") || !strcmp(name, ".."))
629                         continue;
630
631                 /*
632                  * skip info files parsed in perf_pmu__new_alias()
633                  */
634                 if (pmu_alias_info_file(name))
635                         continue;
636
637                 fd = openat(dir_fd, name, O_RDONLY);
638                 if (fd == -1) {
639                         pr_debug("Cannot open %s\n", name);
640                         continue;
641                 }
642                 file = fdopen(fd, "r");
643                 if (!file) {
644                         close(fd);
645                         continue;
646                 }
647
648                 if (perf_pmu__new_alias(pmu, name, /*desc=*/ NULL,
649                                         /*val=*/ NULL, file, /*pe=*/ NULL) < 0)
650                         pr_debug("Cannot set up %s\n", name);
651                 fclose(file);
652         }
653
654         closedir(event_dir);
655         close (dir_fd);
656         pmu->sysfs_aliases_loaded = true;
657         return 0;
658 }
659
660 static int pmu_alias_terms(struct perf_pmu_alias *alias, int err_loc, struct list_head *terms)
661 {
662         struct parse_events_term *term, *cloned;
663         struct parse_events_terms clone_terms;
664
665         parse_events_terms__init(&clone_terms);
666         list_for_each_entry(term, &alias->terms.terms, list) {
667                 int ret = parse_events_term__clone(&cloned, term);
668
669                 if (ret) {
670                         parse_events_terms__exit(&clone_terms);
671                         return ret;
672                 }
673                 /*
674                  * Weak terms don't override command line options,
675                  * which we don't want for implicit terms in aliases.
676                  */
677                 cloned->weak = true;
678                 cloned->err_term = cloned->err_val = err_loc;
679                 list_add_tail(&cloned->list, &clone_terms.terms);
680         }
681         list_splice_init(&clone_terms.terms, terms);
682         parse_events_terms__exit(&clone_terms);
683         return 0;
684 }
685
686 /*
687  * Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64)
688  * may have a "cpus" file.
689  */
690 static struct perf_cpu_map *pmu_cpumask(int dirfd, const char *name, bool is_core)
691 {
692         struct perf_cpu_map *cpus;
693         const char *templates[] = {
694                 "cpumask",
695                 "cpus",
696                 NULL
697         };
698         const char **template;
699         char pmu_name[PATH_MAX];
700         struct perf_pmu pmu = {.name = pmu_name};
701         FILE *file;
702
703         strlcpy(pmu_name, name, sizeof(pmu_name));
704         for (template = templates; *template; template++) {
705                 file = perf_pmu__open_file_at(&pmu, dirfd, *template);
706                 if (!file)
707                         continue;
708                 cpus = perf_cpu_map__read(file);
709                 fclose(file);
710                 if (cpus)
711                         return cpus;
712         }
713
714         /* Nothing found, for core PMUs assume this means all CPUs. */
715         return is_core ? perf_cpu_map__get(cpu_map__online()) : NULL;
716 }
717
718 static bool pmu_is_uncore(int dirfd, const char *name)
719 {
720         int fd;
721
722         fd = perf_pmu__pathname_fd(dirfd, name, "cpumask", O_PATH);
723         if (fd < 0)
724                 return false;
725
726         close(fd);
727         return true;
728 }
729
730 static char *pmu_id(const char *name)
731 {
732         char path[PATH_MAX], *str;
733         size_t len;
734
735         perf_pmu__pathname_scnprintf(path, sizeof(path), name, "identifier");
736
737         if (filename__read_str(path, &str, &len) < 0)
738                 return NULL;
739
740         str[len - 1] = 0; /* remove line feed */
741
742         return str;
743 }
744
745 /**
746  * is_sysfs_pmu_core() - PMU CORE devices have different name other than cpu in
747  *         sysfs on some platforms like ARM or Intel hybrid. Looking for
748  *         possible the cpus file in sysfs files to identify whether this is a
749  *         core device.
750  * @name: The PMU name such as "cpu_atom".
751  */
752 static int is_sysfs_pmu_core(const char *name)
753 {
754         char path[PATH_MAX];
755
756         if (!perf_pmu__pathname_scnprintf(path, sizeof(path), name, "cpus"))
757                 return 0;
758         return file_available(path);
759 }
760
761 char *perf_pmu__getcpuid(struct perf_pmu *pmu)
762 {
763         char *cpuid;
764         static bool printed;
765
766         cpuid = getenv("PERF_CPUID");
767         if (cpuid)
768                 cpuid = strdup(cpuid);
769         if (!cpuid)
770                 cpuid = get_cpuid_str(pmu);
771         if (!cpuid)
772                 return NULL;
773
774         if (!printed) {
775                 pr_debug("Using CPUID %s\n", cpuid);
776                 printed = true;
777         }
778         return cpuid;
779 }
780
781 __weak const struct pmu_metrics_table *pmu_metrics_table__find(void)
782 {
783         return perf_pmu__find_metrics_table(NULL);
784 }
785
786 /**
787  * perf_pmu__match_ignoring_suffix - Does the pmu_name match tok ignoring any
788  *                                   trailing suffix? The Suffix must be in form
789  *                                   tok_{digits}, or tok{digits}.
790  * @pmu_name: The pmu_name with possible suffix.
791  * @tok: The possible match to pmu_name without suffix.
792  */
793 static bool perf_pmu__match_ignoring_suffix(const char *pmu_name, const char *tok)
794 {
795         const char *p;
796
797         if (strncmp(pmu_name, tok, strlen(tok)))
798                 return false;
799
800         p = pmu_name + strlen(tok);
801         if (*p == 0)
802                 return true;
803
804         if (*p == '_')
805                 ++p;
806
807         /* Ensure we end in a number */
808         while (1) {
809                 if (!isdigit(*p))
810                         return false;
811                 if (*(++p) == 0)
812                         break;
813         }
814
815         return true;
816 }
817
818 /**
819  * pmu_uncore_alias_match - does name match the PMU name?
820  * @pmu_name: the json struct pmu_event name. This may lack a suffix (which
821  *            matches) or be of the form "socket,pmuname" which will match
822  *            "socketX_pmunameY".
823  * @name: a real full PMU name as from sysfs.
824  */
825 static bool pmu_uncore_alias_match(const char *pmu_name, const char *name)
826 {
827         char *tmp = NULL, *tok, *str;
828         bool res;
829
830         if (strchr(pmu_name, ',') == NULL)
831                 return perf_pmu__match_ignoring_suffix(name, pmu_name);
832
833         str = strdup(pmu_name);
834         if (!str)
835                 return false;
836
837         /*
838          * uncore alias may be from different PMU with common prefix
839          */
840         tok = strtok_r(str, ",", &tmp);
841         if (strncmp(pmu_name, tok, strlen(tok))) {
842                 res = false;
843                 goto out;
844         }
845
846         /*
847          * Match more complex aliases where the alias name is a comma-delimited
848          * list of tokens, orderly contained in the matching PMU name.
849          *
850          * Example: For alias "socket,pmuname" and PMU "socketX_pmunameY", we
851          *          match "socket" in "socketX_pmunameY" and then "pmuname" in
852          *          "pmunameY".
853          */
854         while (1) {
855                 char *next_tok = strtok_r(NULL, ",", &tmp);
856
857                 name = strstr(name, tok);
858                 if (!name ||
859                     (!next_tok && !perf_pmu__match_ignoring_suffix(name, tok))) {
860                         res = false;
861                         goto out;
862                 }
863                 if (!next_tok)
864                         break;
865                 tok = next_tok;
866                 name += strlen(tok);
867         }
868
869         res = true;
870 out:
871         free(str);
872         return res;
873 }
874
875 bool pmu_uncore_identifier_match(const char *compat, const char *id)
876 {
877         regex_t re;
878         regmatch_t pmatch[1];
879         int match;
880
881         if (regcomp(&re, compat, REG_EXTENDED) != 0) {
882                 /* Warn unable to generate match particular string. */
883                 pr_info("Invalid regular expression %s\n", compat);
884                 return false;
885         }
886
887         match = !regexec(&re, id, 1, pmatch, 0);
888         if (match) {
889                 /* Ensure a full match. */
890                 match = pmatch[0].rm_so == 0 && (size_t)pmatch[0].rm_eo == strlen(id);
891         }
892         regfree(&re);
893
894         return match;
895 }
896
897 static int pmu_add_cpu_aliases_map_callback(const struct pmu_event *pe,
898                                         const struct pmu_events_table *table __maybe_unused,
899                                         void *vdata)
900 {
901         struct perf_pmu *pmu = vdata;
902
903         perf_pmu__new_alias(pmu, pe->name, pe->desc, pe->event, /*val_fd=*/ NULL, pe);
904         return 0;
905 }
906
907 /*
908  * From the pmu_events_table, find the events that correspond to the given
909  * PMU and add them to the list 'head'.
910  */
911 void pmu_add_cpu_aliases_table(struct perf_pmu *pmu, const struct pmu_events_table *table)
912 {
913         pmu_events_table__for_each_event(table, pmu, pmu_add_cpu_aliases_map_callback, pmu);
914 }
915
916 static void pmu_add_cpu_aliases(struct perf_pmu *pmu)
917 {
918         if (!pmu->events_table)
919                 return;
920
921         if (pmu->cpu_aliases_added)
922                 return;
923
924         pmu_add_cpu_aliases_table(pmu, pmu->events_table);
925         pmu->cpu_aliases_added = true;
926 }
927
928 static int pmu_add_sys_aliases_iter_fn(const struct pmu_event *pe,
929                                        const struct pmu_events_table *table __maybe_unused,
930                                        void *vdata)
931 {
932         struct perf_pmu *pmu = vdata;
933
934         if (!pe->compat || !pe->pmu)
935                 return 0;
936
937         if (pmu_uncore_alias_match(pe->pmu, pmu->name) &&
938                         pmu_uncore_identifier_match(pe->compat, pmu->id)) {
939                 perf_pmu__new_alias(pmu,
940                                 pe->name,
941                                 pe->desc,
942                                 pe->event,
943                                 /*val_fd=*/ NULL,
944                                 pe);
945         }
946
947         return 0;
948 }
949
950 void pmu_add_sys_aliases(struct perf_pmu *pmu)
951 {
952         if (!pmu->id)
953                 return;
954
955         pmu_for_each_sys_event(pmu_add_sys_aliases_iter_fn, pmu);
956 }
957
958 static char *pmu_find_alias_name(struct perf_pmu *pmu, int dirfd)
959 {
960         FILE *file = perf_pmu__open_file_at(pmu, dirfd, "alias");
961         char *line = NULL;
962         size_t line_len = 0;
963         ssize_t ret;
964
965         if (!file)
966                 return NULL;
967
968         ret = getline(&line, &line_len, file);
969         if (ret < 0) {
970                 fclose(file);
971                 return NULL;
972         }
973         /* Remove trailing newline. */
974         if (ret > 0 && line[ret - 1] == '\n')
975                 line[--ret] = '\0';
976
977         fclose(file);
978         return line;
979 }
980
981 static int pmu_max_precise(int dirfd, struct perf_pmu *pmu)
982 {
983         int max_precise = -1;
984
985         perf_pmu__scan_file_at(pmu, dirfd, "caps/max_precise", "%d", &max_precise);
986         return max_precise;
987 }
988
989 void __weak
990 perf_pmu__arch_init(struct perf_pmu *pmu)
991 {
992         if (pmu->is_core)
993                 pmu->mem_events = perf_mem_events;
994 }
995
996 struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char *name)
997 {
998         struct perf_pmu *pmu;
999         __u32 type;
1000
1001         pmu = zalloc(sizeof(*pmu));
1002         if (!pmu)
1003                 return NULL;
1004
1005         pmu->name = strdup(name);
1006         if (!pmu->name)
1007                 goto err;
1008
1009         /*
1010          * Read type early to fail fast if a lookup name isn't a PMU. Ensure
1011          * that type value is successfully assigned (return 1).
1012          */
1013         if (perf_pmu__scan_file_at(pmu, dirfd, "type", "%u", &type) != 1)
1014                 goto err;
1015
1016         INIT_LIST_HEAD(&pmu->format);
1017         INIT_LIST_HEAD(&pmu->aliases);
1018         INIT_LIST_HEAD(&pmu->caps);
1019
1020         /*
1021          * The pmu data we store & need consists of the pmu
1022          * type value and format definitions. Load both right
1023          * now.
1024          */
1025         if (pmu_format(pmu, dirfd, name))
1026                 goto err;
1027
1028         pmu->is_core = is_pmu_core(name);
1029         pmu->cpus = pmu_cpumask(dirfd, name, pmu->is_core);
1030
1031         pmu->type = type;
1032         pmu->is_uncore = pmu_is_uncore(dirfd, name);
1033         if (pmu->is_uncore)
1034                 pmu->id = pmu_id(name);
1035         pmu->max_precise = pmu_max_precise(dirfd, pmu);
1036         pmu->alias_name = pmu_find_alias_name(pmu, dirfd);
1037         pmu->events_table = perf_pmu__find_events_table(pmu);
1038         pmu_add_sys_aliases(pmu);
1039         list_add_tail(&pmu->list, pmus);
1040
1041         perf_pmu__arch_init(pmu);
1042
1043         return pmu;
1044 err:
1045         zfree(&pmu->name);
1046         free(pmu);
1047         return NULL;
1048 }
1049
1050 /* Creates the PMU when sysfs scanning fails. */
1051 struct perf_pmu *perf_pmu__create_placeholder_core_pmu(struct list_head *core_pmus)
1052 {
1053         struct perf_pmu *pmu = zalloc(sizeof(*pmu));
1054
1055         if (!pmu)
1056                 return NULL;
1057
1058         pmu->name = strdup("cpu");
1059         if (!pmu->name) {
1060                 free(pmu);
1061                 return NULL;
1062         }
1063
1064         pmu->is_core = true;
1065         pmu->type = PERF_TYPE_RAW;
1066         pmu->cpus = cpu_map__online();
1067
1068         INIT_LIST_HEAD(&pmu->format);
1069         INIT_LIST_HEAD(&pmu->aliases);
1070         INIT_LIST_HEAD(&pmu->caps);
1071         list_add_tail(&pmu->list, core_pmus);
1072         return pmu;
1073 }
1074
1075 void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu)
1076 {
1077         struct perf_pmu_format *format;
1078
1079         if (pmu->formats_checked)
1080                 return;
1081
1082         pmu->formats_checked = true;
1083
1084         /* fake pmu doesn't have format list */
1085         if (pmu == &perf_pmu__fake)
1086                 return;
1087
1088         list_for_each_entry(format, &pmu->format, list) {
1089                 perf_pmu_format__load(pmu, format);
1090                 if (format->value >= PERF_PMU_FORMAT_VALUE_CONFIG_END) {
1091                         pr_warning("WARNING: '%s' format '%s' requires 'perf_event_attr::config%d'"
1092                                    "which is not supported by this version of perf!\n",
1093                                    pmu->name, format->name, format->value);
1094                         return;
1095                 }
1096         }
1097 }
1098
1099 bool evsel__is_aux_event(const struct evsel *evsel)
1100 {
1101         struct perf_pmu *pmu = evsel__find_pmu(evsel);
1102
1103         return pmu && pmu->auxtrace;
1104 }
1105
1106 /*
1107  * Set @config_name to @val as long as the user hasn't already set or cleared it
1108  * by passing a config term on the command line.
1109  *
1110  * @val is the value to put into the bits specified by @config_name rather than
1111  * the bit pattern. It is shifted into position by this function, so to set
1112  * something to true, pass 1 for val rather than a pre shifted value.
1113  */
1114 #define field_prep(_mask, _val) (((_val) << (ffsll(_mask) - 1)) & (_mask))
1115 void evsel__set_config_if_unset(struct perf_pmu *pmu, struct evsel *evsel,
1116                                 const char *config_name, u64 val)
1117 {
1118         u64 user_bits = 0, bits;
1119         struct evsel_config_term *term = evsel__get_config_term(evsel, CFG_CHG);
1120
1121         if (term)
1122                 user_bits = term->val.cfg_chg;
1123
1124         bits = perf_pmu__format_bits(pmu, config_name);
1125
1126         /* Do nothing if the user changed the value */
1127         if (bits & user_bits)
1128                 return;
1129
1130         /* Otherwise replace it */
1131         evsel->core.attr.config &= ~bits;
1132         evsel->core.attr.config |= field_prep(bits, val);
1133 }
1134
1135 static struct perf_pmu_format *
1136 pmu_find_format(const struct list_head *formats, const char *name)
1137 {
1138         struct perf_pmu_format *format;
1139
1140         list_for_each_entry(format, formats, list)
1141                 if (!strcmp(format->name, name))
1142                         return format;
1143
1144         return NULL;
1145 }
1146
1147 __u64 perf_pmu__format_bits(struct perf_pmu *pmu, const char *name)
1148 {
1149         struct perf_pmu_format *format = pmu_find_format(&pmu->format, name);
1150         __u64 bits = 0;
1151         int fbit;
1152
1153         if (!format)
1154                 return 0;
1155
1156         for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
1157                 bits |= 1ULL << fbit;
1158
1159         return bits;
1160 }
1161
1162 int perf_pmu__format_type(struct perf_pmu *pmu, const char *name)
1163 {
1164         struct perf_pmu_format *format = pmu_find_format(&pmu->format, name);
1165
1166         if (!format)
1167                 return -1;
1168
1169         perf_pmu_format__load(pmu, format);
1170         return format->value;
1171 }
1172
1173 /*
1174  * Sets value based on the format definition (format parameter)
1175  * and unformatted value (value parameter).
1176  */
1177 static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
1178                              bool zero)
1179 {
1180         unsigned long fbit, vbit;
1181
1182         for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
1183
1184                 if (!test_bit(fbit, format))
1185                         continue;
1186
1187                 if (value & (1llu << vbit++))
1188                         *v |= (1llu << fbit);
1189                 else if (zero)
1190                         *v &= ~(1llu << fbit);
1191         }
1192 }
1193
1194 static __u64 pmu_format_max_value(const unsigned long *format)
1195 {
1196         int w;
1197
1198         w = bitmap_weight(format, PERF_PMU_FORMAT_BITS);
1199         if (!w)
1200                 return 0;
1201         if (w < 64)
1202                 return (1ULL << w) - 1;
1203         return -1;
1204 }
1205
1206 /*
1207  * Term is a string term, and might be a param-term. Try to look up it's value
1208  * in the remaining terms.
1209  * - We have a term like "base-or-format-term=param-term",
1210  * - We need to find the value supplied for "param-term" (with param-term named
1211  *   in a config string) later on in the term list.
1212  */
1213 static int pmu_resolve_param_term(struct parse_events_term *term,
1214                                   struct parse_events_terms *head_terms,
1215                                   __u64 *value)
1216 {
1217         struct parse_events_term *t;
1218
1219         list_for_each_entry(t, &head_terms->terms, list) {
1220                 if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM &&
1221                     t->config && !strcmp(t->config, term->config)) {
1222                         t->used = true;
1223                         *value = t->val.num;
1224                         return 0;
1225                 }
1226         }
1227
1228         if (verbose > 0)
1229                 printf("Required parameter '%s' not specified\n", term->config);
1230
1231         return -1;
1232 }
1233
1234 static char *pmu_formats_string(const struct list_head *formats)
1235 {
1236         struct perf_pmu_format *format;
1237         char *str = NULL;
1238         struct strbuf buf = STRBUF_INIT;
1239         unsigned int i = 0;
1240
1241         if (!formats)
1242                 return NULL;
1243
1244         /* sysfs exported terms */
1245         list_for_each_entry(format, formats, list)
1246                 if (strbuf_addf(&buf, i++ ? ",%s" : "%s", format->name) < 0)
1247                         goto error;
1248
1249         str = strbuf_detach(&buf, NULL);
1250 error:
1251         strbuf_release(&buf);
1252
1253         return str;
1254 }
1255
1256 /*
1257  * Setup one of config[12] attr members based on the
1258  * user input data - term parameter.
1259  */
1260 static int pmu_config_term(const struct perf_pmu *pmu,
1261                            struct perf_event_attr *attr,
1262                            struct parse_events_term *term,
1263                            struct parse_events_terms *head_terms,
1264                            bool zero, struct parse_events_error *err)
1265 {
1266         struct perf_pmu_format *format;
1267         __u64 *vp;
1268         __u64 val, max_val;
1269
1270         /*
1271          * If this is a parameter we've already used for parameterized-eval,
1272          * skip it in normal eval.
1273          */
1274         if (term->used)
1275                 return 0;
1276
1277         /*
1278          * Hardcoded terms should be already in, so nothing
1279          * to be done for them.
1280          */
1281         if (parse_events__is_hardcoded_term(term))
1282                 return 0;
1283
1284         format = pmu_find_format(&pmu->format, term->config);
1285         if (!format) {
1286                 char *pmu_term = pmu_formats_string(&pmu->format);
1287                 char *unknown_term;
1288                 char *help_msg;
1289
1290                 if (asprintf(&unknown_term,
1291                                 "unknown term '%s' for pmu '%s'",
1292                                 term->config, pmu->name) < 0)
1293                         unknown_term = NULL;
1294                 help_msg = parse_events_formats_error_string(pmu_term);
1295                 if (err) {
1296                         parse_events_error__handle(err, term->err_term,
1297                                                    unknown_term,
1298                                                    help_msg);
1299                 } else {
1300                         pr_debug("%s (%s)\n", unknown_term, help_msg);
1301                         free(unknown_term);
1302                 }
1303                 free(pmu_term);
1304                 return -EINVAL;
1305         }
1306         perf_pmu_format__load(pmu, format);
1307         switch (format->value) {
1308         case PERF_PMU_FORMAT_VALUE_CONFIG:
1309                 vp = &attr->config;
1310                 break;
1311         case PERF_PMU_FORMAT_VALUE_CONFIG1:
1312                 vp = &attr->config1;
1313                 break;
1314         case PERF_PMU_FORMAT_VALUE_CONFIG2:
1315                 vp = &attr->config2;
1316                 break;
1317         case PERF_PMU_FORMAT_VALUE_CONFIG3:
1318                 vp = &attr->config3;
1319                 break;
1320         default:
1321                 return -EINVAL;
1322         }
1323
1324         /*
1325          * Either directly use a numeric term, or try to translate string terms
1326          * using event parameters.
1327          */
1328         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
1329                 if (term->no_value &&
1330                     bitmap_weight(format->bits, PERF_PMU_FORMAT_BITS) > 1) {
1331                         if (err) {
1332                                 parse_events_error__handle(err, term->err_val,
1333                                            strdup("no value assigned for term"),
1334                                            NULL);
1335                         }
1336                         return -EINVAL;
1337                 }
1338
1339                 val = term->val.num;
1340         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
1341                 if (strcmp(term->val.str, "?")) {
1342                         if (verbose > 0) {
1343                                 pr_info("Invalid sysfs entry %s=%s\n",
1344                                                 term->config, term->val.str);
1345                         }
1346                         if (err) {
1347                                 parse_events_error__handle(err, term->err_val,
1348                                         strdup("expected numeric value"),
1349                                         NULL);
1350                         }
1351                         return -EINVAL;
1352                 }
1353
1354                 if (pmu_resolve_param_term(term, head_terms, &val))
1355                         return -EINVAL;
1356         } else
1357                 return -EINVAL;
1358
1359         max_val = pmu_format_max_value(format->bits);
1360         if (val > max_val) {
1361                 if (err) {
1362                         char *err_str;
1363
1364                         parse_events_error__handle(err, term->err_val,
1365                                 asprintf(&err_str,
1366                                     "value too big for format (%s), maximum is %llu",
1367                                     format->name, (unsigned long long)max_val) < 0
1368                                     ? strdup("value too big for format")
1369                                     : err_str,
1370                                     NULL);
1371                         return -EINVAL;
1372                 }
1373                 /*
1374                  * Assume we don't care if !err, in which case the value will be
1375                  * silently truncated.
1376                  */
1377         }
1378
1379         pmu_format_value(format->bits, val, vp, zero);
1380         return 0;
1381 }
1382
1383 int perf_pmu__config_terms(const struct perf_pmu *pmu,
1384                            struct perf_event_attr *attr,
1385                            struct parse_events_terms *terms,
1386                            bool zero, struct parse_events_error *err)
1387 {
1388         struct parse_events_term *term;
1389
1390         list_for_each_entry(term, &terms->terms, list) {
1391                 if (pmu_config_term(pmu, attr, term, terms, zero, err))
1392                         return -EINVAL;
1393         }
1394
1395         return 0;
1396 }
1397
1398 /*
1399  * Configures event's 'attr' parameter based on the:
1400  * 1) users input - specified in terms parameter
1401  * 2) pmu format definitions - specified by pmu parameter
1402  */
1403 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
1404                      struct parse_events_terms *head_terms,
1405                      struct parse_events_error *err)
1406 {
1407         bool zero = !!pmu->perf_event_attr_init_default;
1408
1409         return perf_pmu__config_terms(pmu, attr, head_terms, zero, err);
1410 }
1411
1412 static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
1413                                              struct parse_events_term *term)
1414 {
1415         struct perf_pmu_alias *alias;
1416         const char *name;
1417
1418         if (parse_events__is_hardcoded_term(term))
1419                 return NULL;
1420
1421         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
1422                 if (!term->no_value)
1423                         return NULL;
1424                 if (pmu_find_format(&pmu->format, term->config))
1425                         return NULL;
1426                 name = term->config;
1427
1428         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
1429                 if (strcasecmp(term->config, "event"))
1430                         return NULL;
1431                 name = term->val.str;
1432         } else {
1433                 return NULL;
1434         }
1435
1436         alias = perf_pmu__find_alias(pmu, name, /*load=*/ true);
1437         if (alias || pmu->cpu_aliases_added)
1438                 return alias;
1439
1440         /* Alias doesn't exist, try to get it from the json events. */
1441         if (pmu->events_table &&
1442             pmu_events_table__find_event(pmu->events_table, pmu, name,
1443                                          pmu_add_cpu_aliases_map_callback,
1444                                          pmu) == 0) {
1445                 alias = perf_pmu__find_alias(pmu, name, /*load=*/ false);
1446         }
1447         return alias;
1448 }
1449
1450
1451 static int check_info_data(struct perf_pmu *pmu,
1452                            struct perf_pmu_alias *alias,
1453                            struct perf_pmu_info *info,
1454                            struct parse_events_error *err,
1455                            int column)
1456 {
1457         read_alias_info(pmu, alias);
1458         /*
1459          * Only one term in event definition can
1460          * define unit, scale and snapshot, fail
1461          * if there's more than one.
1462          */
1463         if (info->unit && alias->unit[0]) {
1464                 parse_events_error__handle(err, column,
1465                                         strdup("Attempt to set event's unit twice"),
1466                                         NULL);
1467                 return -EINVAL;
1468         }
1469         if (info->scale && alias->scale) {
1470                 parse_events_error__handle(err, column,
1471                                         strdup("Attempt to set event's scale twice"),
1472                                         NULL);
1473                 return -EINVAL;
1474         }
1475         if (info->snapshot && alias->snapshot) {
1476                 parse_events_error__handle(err, column,
1477                                         strdup("Attempt to set event snapshot twice"),
1478                                         NULL);
1479                 return -EINVAL;
1480         }
1481
1482         if (alias->unit[0])
1483                 info->unit = alias->unit;
1484
1485         if (alias->scale)
1486                 info->scale = alias->scale;
1487
1488         if (alias->snapshot)
1489                 info->snapshot = alias->snapshot;
1490
1491         return 0;
1492 }
1493
1494 /*
1495  * Find alias in the terms list and replace it with the terms
1496  * defined for the alias
1497  */
1498 int perf_pmu__check_alias(struct perf_pmu *pmu, struct parse_events_terms *head_terms,
1499                           struct perf_pmu_info *info, bool *rewrote_terms,
1500                           struct parse_events_error *err)
1501 {
1502         struct parse_events_term *term, *h;
1503         struct perf_pmu_alias *alias;
1504         int ret;
1505
1506         *rewrote_terms = false;
1507         info->per_pkg = false;
1508
1509         /*
1510          * Mark unit and scale as not set
1511          * (different from default values, see below)
1512          */
1513         info->unit     = NULL;
1514         info->scale    = 0.0;
1515         info->snapshot = false;
1516
1517         list_for_each_entry_safe(term, h, &head_terms->terms, list) {
1518                 alias = pmu_find_alias(pmu, term);
1519                 if (!alias)
1520                         continue;
1521                 ret = pmu_alias_terms(alias, term->err_term, &term->list);
1522                 if (ret) {
1523                         parse_events_error__handle(err, term->err_term,
1524                                                 strdup("Failure to duplicate terms"),
1525                                                 NULL);
1526                         return ret;
1527                 }
1528                 *rewrote_terms = true;
1529                 ret = check_info_data(pmu, alias, info, err, term->err_term);
1530                 if (ret)
1531                         return ret;
1532
1533                 if (alias->per_pkg)
1534                         info->per_pkg = true;
1535
1536                 list_del_init(&term->list);
1537                 parse_events_term__delete(term);
1538         }
1539
1540         /*
1541          * if no unit or scale found in aliases, then
1542          * set defaults as for evsel
1543          * unit cannot left to NULL
1544          */
1545         if (info->unit == NULL)
1546                 info->unit   = "";
1547
1548         if (info->scale == 0.0)
1549                 info->scale  = 1.0;
1550
1551         return 0;
1552 }
1553
1554 struct find_event_args {
1555         const char *event;
1556         void *state;
1557         pmu_event_callback cb;
1558 };
1559
1560 static int find_event_callback(void *state, struct pmu_event_info *info)
1561 {
1562         struct find_event_args *args = state;
1563
1564         if (!strcmp(args->event, info->name))
1565                 return args->cb(args->state, info);
1566
1567         return 0;
1568 }
1569
1570 int perf_pmu__find_event(struct perf_pmu *pmu, const char *event, void *state, pmu_event_callback cb)
1571 {
1572         struct find_event_args args = {
1573                 .event = event,
1574                 .state = state,
1575                 .cb = cb,
1576         };
1577
1578         /* Sub-optimal, but function is only used by tests. */
1579         return perf_pmu__for_each_event(pmu, /*skip_duplicate_pmus=*/ false,
1580                                         &args, find_event_callback);
1581 }
1582
1583 static void perf_pmu__del_formats(struct list_head *formats)
1584 {
1585         struct perf_pmu_format *fmt, *tmp;
1586
1587         list_for_each_entry_safe(fmt, tmp, formats, list) {
1588                 list_del(&fmt->list);
1589                 zfree(&fmt->name);
1590                 free(fmt);
1591         }
1592 }
1593
1594 bool perf_pmu__has_format(const struct perf_pmu *pmu, const char *name)
1595 {
1596         struct perf_pmu_format *format;
1597
1598         list_for_each_entry(format, &pmu->format, list) {
1599                 if (!strcmp(format->name, name))
1600                         return true;
1601         }
1602         return false;
1603 }
1604
1605 bool is_pmu_core(const char *name)
1606 {
1607         return !strcmp(name, "cpu") || !strcmp(name, "cpum_cf") || is_sysfs_pmu_core(name);
1608 }
1609
1610 bool perf_pmu__supports_legacy_cache(const struct perf_pmu *pmu)
1611 {
1612         return pmu->is_core;
1613 }
1614
1615 bool perf_pmu__auto_merge_stats(const struct perf_pmu *pmu)
1616 {
1617         return !pmu->is_core || perf_pmus__num_core_pmus() == 1;
1618 }
1619
1620 bool perf_pmu__have_event(struct perf_pmu *pmu, const char *name)
1621 {
1622         if (!name)
1623                 return false;
1624         if (perf_pmu__find_alias(pmu, name, /*load=*/ true) != NULL)
1625                 return true;
1626         if (pmu->cpu_aliases_added || !pmu->events_table)
1627                 return false;
1628         return pmu_events_table__find_event(pmu->events_table, pmu, name, NULL, NULL) == 0;
1629 }
1630
1631 size_t perf_pmu__num_events(struct perf_pmu *pmu)
1632 {
1633         size_t nr;
1634
1635         if (!pmu->sysfs_aliases_loaded)
1636                 pmu_aliases_parse(pmu);
1637
1638         nr = pmu->sysfs_aliases;
1639
1640         if (pmu->cpu_aliases_added)
1641                  nr += pmu->loaded_json_aliases;
1642         else if (pmu->events_table)
1643                 nr += pmu_events_table__num_events(pmu->events_table, pmu) - pmu->loaded_json_aliases;
1644
1645         return pmu->selectable ? nr + 1 : nr;
1646 }
1647
1648 static int sub_non_neg(int a, int b)
1649 {
1650         if (b > a)
1651                 return 0;
1652         return a - b;
1653 }
1654
1655 static char *format_alias(char *buf, int len, const struct perf_pmu *pmu,
1656                           const struct perf_pmu_alias *alias, bool skip_duplicate_pmus)
1657 {
1658         struct parse_events_term *term;
1659         int pmu_name_len = skip_duplicate_pmus
1660                 ? pmu_name_len_no_suffix(pmu->name, /*num=*/NULL)
1661                 : (int)strlen(pmu->name);
1662         int used = snprintf(buf, len, "%.*s/%s", pmu_name_len, pmu->name, alias->name);
1663
1664         list_for_each_entry(term, &alias->terms.terms, list) {
1665                 if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
1666                         used += snprintf(buf + used, sub_non_neg(len, used),
1667                                         ",%s=%s", term->config,
1668                                         term->val.str);
1669         }
1670
1671         if (sub_non_neg(len, used) > 0) {
1672                 buf[used] = '/';
1673                 used++;
1674         }
1675         if (sub_non_neg(len, used) > 0) {
1676                 buf[used] = '\0';
1677                 used++;
1678         } else
1679                 buf[len - 1] = '\0';
1680
1681         return buf;
1682 }
1683
1684 int perf_pmu__for_each_event(struct perf_pmu *pmu, bool skip_duplicate_pmus,
1685                              void *state, pmu_event_callback cb)
1686 {
1687         char buf[1024];
1688         struct perf_pmu_alias *event;
1689         struct pmu_event_info info = {
1690                 .pmu = pmu,
1691         };
1692         int ret = 0;
1693         struct strbuf sb;
1694
1695         strbuf_init(&sb, /*hint=*/ 0);
1696         pmu_add_cpu_aliases(pmu);
1697         list_for_each_entry(event, &pmu->aliases, list) {
1698                 size_t buf_used;
1699
1700                 info.pmu_name = event->pmu_name ?: pmu->name;
1701                 info.alias = NULL;
1702                 if (event->desc) {
1703                         info.name = event->name;
1704                         buf_used = 0;
1705                 } else {
1706                         info.name = format_alias(buf, sizeof(buf), pmu, event,
1707                                                  skip_duplicate_pmus);
1708                         if (pmu->is_core) {
1709                                 info.alias = info.name;
1710                                 info.name = event->name;
1711                         }
1712                         buf_used = strlen(buf) + 1;
1713                 }
1714                 info.scale_unit = NULL;
1715                 if (strlen(event->unit) || event->scale != 1.0) {
1716                         info.scale_unit = buf + buf_used;
1717                         buf_used += snprintf(buf + buf_used, sizeof(buf) - buf_used,
1718                                         "%G%s", event->scale, event->unit) + 1;
1719                 }
1720                 info.desc = event->desc;
1721                 info.long_desc = event->long_desc;
1722                 info.encoding_desc = buf + buf_used;
1723                 parse_events_terms__to_strbuf(&event->terms, &sb);
1724                 buf_used += snprintf(buf + buf_used, sizeof(buf) - buf_used,
1725                                 "%s/%s/", info.pmu_name, sb.buf) + 1;
1726                 info.topic = event->topic;
1727                 info.str = sb.buf;
1728                 info.deprecated = event->deprecated;
1729                 ret = cb(state, &info);
1730                 if (ret)
1731                         goto out;
1732                 strbuf_setlen(&sb, /*len=*/ 0);
1733         }
1734         if (pmu->selectable) {
1735                 info.name = buf;
1736                 snprintf(buf, sizeof(buf), "%s//", pmu->name);
1737                 info.alias = NULL;
1738                 info.scale_unit = NULL;
1739                 info.desc = NULL;
1740                 info.long_desc = NULL;
1741                 info.encoding_desc = NULL;
1742                 info.topic = NULL;
1743                 info.pmu_name = pmu->name;
1744                 info.deprecated = false;
1745                 ret = cb(state, &info);
1746         }
1747 out:
1748         strbuf_release(&sb);
1749         return ret;
1750 }
1751
1752 bool pmu__name_match(const struct perf_pmu *pmu, const char *pmu_name)
1753 {
1754         return !strcmp(pmu->name, pmu_name) ||
1755                 (pmu->is_uncore && pmu_uncore_alias_match(pmu_name, pmu->name)) ||
1756                 /*
1757                  * jevents and tests use default_core as a marker for any core
1758                  * PMU as the PMU name varies across architectures.
1759                  */
1760                 (pmu->is_core && !strcmp(pmu_name, "default_core"));
1761 }
1762
1763 bool perf_pmu__is_software(const struct perf_pmu *pmu)
1764 {
1765         const char *known_sw_pmus[] = {
1766                 "kprobe",
1767                 "msr",
1768                 "uprobe",
1769         };
1770
1771         if (pmu->is_core || pmu->is_uncore || pmu->auxtrace)
1772                 return false;
1773         switch (pmu->type) {
1774         case PERF_TYPE_HARDWARE:        return false;
1775         case PERF_TYPE_SOFTWARE:        return true;
1776         case PERF_TYPE_TRACEPOINT:      return true;
1777         case PERF_TYPE_HW_CACHE:        return false;
1778         case PERF_TYPE_RAW:             return false;
1779         case PERF_TYPE_BREAKPOINT:      return true;
1780         default: break;
1781         }
1782         for (size_t i = 0; i < ARRAY_SIZE(known_sw_pmus); i++) {
1783                 if (!strcmp(pmu->name, known_sw_pmus[i]))
1784                         return true;
1785         }
1786         return false;
1787 }
1788
1789 FILE *perf_pmu__open_file(const struct perf_pmu *pmu, const char *name)
1790 {
1791         char path[PATH_MAX];
1792
1793         if (!perf_pmu__pathname_scnprintf(path, sizeof(path), pmu->name, name) ||
1794             !file_available(path))
1795                 return NULL;
1796
1797         return fopen(path, "r");
1798 }
1799
1800 FILE *perf_pmu__open_file_at(const struct perf_pmu *pmu, int dirfd, const char *name)
1801 {
1802         int fd;
1803
1804         fd = perf_pmu__pathname_fd(dirfd, pmu->name, name, O_RDONLY);
1805         if (fd < 0)
1806                 return NULL;
1807
1808         return fdopen(fd, "r");
1809 }
1810
1811 int perf_pmu__scan_file(const struct perf_pmu *pmu, const char *name, const char *fmt,
1812                         ...)
1813 {
1814         va_list args;
1815         FILE *file;
1816         int ret = EOF;
1817
1818         va_start(args, fmt);
1819         file = perf_pmu__open_file(pmu, name);
1820         if (file) {
1821                 ret = vfscanf(file, fmt, args);
1822                 fclose(file);
1823         }
1824         va_end(args);
1825         return ret;
1826 }
1827
1828 int perf_pmu__scan_file_at(const struct perf_pmu *pmu, int dirfd, const char *name,
1829                            const char *fmt, ...)
1830 {
1831         va_list args;
1832         FILE *file;
1833         int ret = EOF;
1834
1835         va_start(args, fmt);
1836         file = perf_pmu__open_file_at(pmu, dirfd, name);
1837         if (file) {
1838                 ret = vfscanf(file, fmt, args);
1839                 fclose(file);
1840         }
1841         va_end(args);
1842         return ret;
1843 }
1844
1845 bool perf_pmu__file_exists(const struct perf_pmu *pmu, const char *name)
1846 {
1847         char path[PATH_MAX];
1848
1849         if (!perf_pmu__pathname_scnprintf(path, sizeof(path), pmu->name, name))
1850                 return false;
1851
1852         return file_available(path);
1853 }
1854
1855 static int perf_pmu__new_caps(struct list_head *list, char *name, char *value)
1856 {
1857         struct perf_pmu_caps *caps = zalloc(sizeof(*caps));
1858
1859         if (!caps)
1860                 return -ENOMEM;
1861
1862         caps->name = strdup(name);
1863         if (!caps->name)
1864                 goto free_caps;
1865         caps->value = strndup(value, strlen(value) - 1);
1866         if (!caps->value)
1867                 goto free_name;
1868         list_add_tail(&caps->list, list);
1869         return 0;
1870
1871 free_name:
1872         zfree(&caps->name);
1873 free_caps:
1874         free(caps);
1875
1876         return -ENOMEM;
1877 }
1878
1879 static void perf_pmu__del_caps(struct perf_pmu *pmu)
1880 {
1881         struct perf_pmu_caps *caps, *tmp;
1882
1883         list_for_each_entry_safe(caps, tmp, &pmu->caps, list) {
1884                 list_del(&caps->list);
1885                 zfree(&caps->name);
1886                 zfree(&caps->value);
1887                 free(caps);
1888         }
1889 }
1890
1891 /*
1892  * Reading/parsing the given pmu capabilities, which should be located at:
1893  * /sys/bus/event_source/devices/<dev>/caps as sysfs group attributes.
1894  * Return the number of capabilities
1895  */
1896 int perf_pmu__caps_parse(struct perf_pmu *pmu)
1897 {
1898         struct stat st;
1899         char caps_path[PATH_MAX];
1900         DIR *caps_dir;
1901         struct dirent *evt_ent;
1902         int caps_fd;
1903
1904         if (pmu->caps_initialized)
1905                 return pmu->nr_caps;
1906
1907         pmu->nr_caps = 0;
1908
1909         if (!perf_pmu__pathname_scnprintf(caps_path, sizeof(caps_path), pmu->name, "caps"))
1910                 return -1;
1911
1912         if (stat(caps_path, &st) < 0) {
1913                 pmu->caps_initialized = true;
1914                 return 0;       /* no error if caps does not exist */
1915         }
1916
1917         caps_dir = opendir(caps_path);
1918         if (!caps_dir)
1919                 return -EINVAL;
1920
1921         caps_fd = dirfd(caps_dir);
1922
1923         while ((evt_ent = readdir(caps_dir)) != NULL) {
1924                 char *name = evt_ent->d_name;
1925                 char value[128];
1926                 FILE *file;
1927                 int fd;
1928
1929                 if (!strcmp(name, ".") || !strcmp(name, ".."))
1930                         continue;
1931
1932                 fd = openat(caps_fd, name, O_RDONLY);
1933                 if (fd == -1)
1934                         continue;
1935                 file = fdopen(fd, "r");
1936                 if (!file) {
1937                         close(fd);
1938                         continue;
1939                 }
1940
1941                 if (!fgets(value, sizeof(value), file) ||
1942                     (perf_pmu__new_caps(&pmu->caps, name, value) < 0)) {
1943                         fclose(file);
1944                         continue;
1945                 }
1946
1947                 pmu->nr_caps++;
1948                 fclose(file);
1949         }
1950
1951         closedir(caps_dir);
1952
1953         pmu->caps_initialized = true;
1954         return pmu->nr_caps;
1955 }
1956
1957 static void perf_pmu__compute_config_masks(struct perf_pmu *pmu)
1958 {
1959         struct perf_pmu_format *format;
1960
1961         if (pmu->config_masks_computed)
1962                 return;
1963
1964         list_for_each_entry(format, &pmu->format, list) {
1965                 unsigned int i;
1966                 __u64 *mask;
1967
1968                 if (format->value >= PERF_PMU_FORMAT_VALUE_CONFIG_END)
1969                         continue;
1970
1971                 pmu->config_masks_present = true;
1972                 mask = &pmu->config_masks[format->value];
1973
1974                 for_each_set_bit(i, format->bits, PERF_PMU_FORMAT_BITS)
1975                         *mask |= 1ULL << i;
1976         }
1977         pmu->config_masks_computed = true;
1978 }
1979
1980 void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
1981                                    const char *name, int config_num,
1982                                    const char *config_name)
1983 {
1984         __u64 bits;
1985         char buf[100];
1986
1987         perf_pmu__compute_config_masks(pmu);
1988
1989         /*
1990          * Kernel doesn't export any valid format bits.
1991          */
1992         if (!pmu->config_masks_present)
1993                 return;
1994
1995         bits = config & ~pmu->config_masks[config_num];
1996         if (bits == 0)
1997                 return;
1998
1999         bitmap_scnprintf((unsigned long *)&bits, sizeof(bits) * 8, buf, sizeof(buf));
2000
2001         pr_warning("WARNING: event '%s' not valid (bits %s of %s "
2002                    "'%llx' not supported by kernel)!\n",
2003                    name ?: "N/A", buf, config_name, config);
2004 }
2005
2006 int perf_pmu__match(const char *pattern, const char *name, const char *tok)
2007 {
2008         if (!name)
2009                 return -1;
2010
2011         if (fnmatch(pattern, name, 0))
2012                 return -1;
2013
2014         if (tok && !perf_pmu__match_ignoring_suffix(name, tok))
2015                 return -1;
2016
2017         return 0;
2018 }
2019
2020 double __weak perf_pmu__cpu_slots_per_cycle(void)
2021 {
2022         return NAN;
2023 }
2024
2025 int perf_pmu__event_source_devices_scnprintf(char *pathname, size_t size)
2026 {
2027         const char *sysfs = sysfs__mountpoint();
2028
2029         if (!sysfs)
2030                 return 0;
2031         return scnprintf(pathname, size, "%s/bus/event_source/devices/", sysfs);
2032 }
2033
2034 int perf_pmu__event_source_devices_fd(void)
2035 {
2036         char path[PATH_MAX];
2037         const char *sysfs = sysfs__mountpoint();
2038
2039         if (!sysfs)
2040                 return -1;
2041
2042         scnprintf(path, sizeof(path), "%s/bus/event_source/devices/", sysfs);
2043         return open(path, O_DIRECTORY);
2044 }
2045
2046 /*
2047  * Fill 'buf' with the path to a file or folder in 'pmu_name' in
2048  * sysfs. For example if pmu_name = "cs_etm" and 'filename' = "format"
2049  * then pathname will be filled with
2050  * "/sys/bus/event_source/devices/cs_etm/format"
2051  *
2052  * Return 0 if the sysfs mountpoint couldn't be found, if no characters were
2053  * written or if the buffer size is exceeded.
2054  */
2055 int perf_pmu__pathname_scnprintf(char *buf, size_t size,
2056                                  const char *pmu_name, const char *filename)
2057 {
2058         size_t len;
2059
2060         len = perf_pmu__event_source_devices_scnprintf(buf, size);
2061         if (!len || (len + strlen(pmu_name) + strlen(filename) + 1)  >= size)
2062                 return 0;
2063
2064         return scnprintf(buf + len, size - len, "%s/%s", pmu_name, filename);
2065 }
2066
2067 int perf_pmu__pathname_fd(int dirfd, const char *pmu_name, const char *filename, int flags)
2068 {
2069         char path[PATH_MAX];
2070
2071         scnprintf(path, sizeof(path), "%s/%s", pmu_name, filename);
2072         return openat(dirfd, path, flags);
2073 }
2074
2075 void perf_pmu__delete(struct perf_pmu *pmu)
2076 {
2077         perf_pmu__del_formats(&pmu->format);
2078         perf_pmu__del_aliases(pmu);
2079         perf_pmu__del_caps(pmu);
2080
2081         perf_cpu_map__put(pmu->cpus);
2082
2083         zfree(&pmu->name);
2084         zfree(&pmu->alias_name);
2085         zfree(&pmu->id);
2086         free(pmu);
2087 }