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1#include <linux/list.h>
2#include <sys/types.h>
3#include <unistd.h>
4#include <stdio.h>
5#include <dirent.h>
6#include <api/fs/fs.h>
7#include <locale.h>
8#include "util.h"
9#include "pmu.h"
10#include "parse-events.h"
11#include "cpumap.h"
12
13#define UNIT_MAX_LEN 31 /* max length for event unit name */
14
15struct perf_pmu_alias {
16 char *name;
17 struct list_head terms;
18 struct list_head list;
19 char unit[UNIT_MAX_LEN+1];
20 double scale;
21};
22
23struct perf_pmu_format {
24 char *name;
25 int value;
26 DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
27 struct list_head list;
28};
29
30#define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
31
32int perf_pmu_parse(struct list_head *list, char *name);
33extern FILE *perf_pmu_in;
34
35static LIST_HEAD(pmus);
36
37/*
38 * Parse & process all the sysfs attributes located under
39 * the directory specified in 'dir' parameter.
40 */
41int perf_pmu__format_parse(char *dir, struct list_head *head)
42{
43 struct dirent *evt_ent;
44 DIR *format_dir;
45 int ret = 0;
46
47 format_dir = opendir(dir);
48 if (!format_dir)
49 return -EINVAL;
50
51 while (!ret && (evt_ent = readdir(format_dir))) {
52 char path[PATH_MAX];
53 char *name = evt_ent->d_name;
54 FILE *file;
55
56 if (!strcmp(name, ".") || !strcmp(name, ".."))
57 continue;
58
59 snprintf(path, PATH_MAX, "%s/%s", dir, name);
60
61 ret = -EINVAL;
62 file = fopen(path, "r");
63 if (!file)
64 break;
65
66 perf_pmu_in = file;
67 ret = perf_pmu_parse(head, name);
68 fclose(file);
69 }
70
71 closedir(format_dir);
72 return ret;
73}
74
75/*
76 * Reading/parsing the default pmu format definition, which should be
77 * located at:
78 * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
79 */
80static int pmu_format(const char *name, struct list_head *format)
81{
82 struct stat st;
83 char path[PATH_MAX];
84 const char *sysfs = sysfs__mountpoint();
85
86 if (!sysfs)
87 return -1;
88
89 snprintf(path, PATH_MAX,
90 "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);
91
92 if (stat(path, &st) < 0)
93 return 0; /* no error if format does not exist */
94
95 if (perf_pmu__format_parse(path, format))
96 return -1;
97
98 return 0;
99}
100
101static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *name)
102{
103 struct stat st;
104 ssize_t sret;
105 char scale[128];
106 int fd, ret = -1;
107 char path[PATH_MAX];
108 const char *lc;
109
110 snprintf(path, PATH_MAX, "%s/%s.scale", dir, name);
111
112 fd = open(path, O_RDONLY);
113 if (fd == -1)
114 return -1;
115
116 if (fstat(fd, &st) < 0)
117 goto error;
118
119 sret = read(fd, scale, sizeof(scale)-1);
120 if (sret < 0)
121 goto error;
122
123 scale[sret] = '\0';
124 /*
125 * save current locale
126 */
127 lc = setlocale(LC_NUMERIC, NULL);
128
129 /*
130 * force to C locale to ensure kernel
131 * scale string is converted correctly.
132 * kernel uses default C locale.
133 */
134 setlocale(LC_NUMERIC, "C");
135
136 alias->scale = strtod(scale, NULL);
137
138 /* restore locale */
139 setlocale(LC_NUMERIC, lc);
140
141 ret = 0;
142error:
143 close(fd);
144 return ret;
145}
146
147static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, char *dir, char *name)
148{
149 char path[PATH_MAX];
150 ssize_t sret;
151 int fd;
152
153 snprintf(path, PATH_MAX, "%s/%s.unit", dir, name);
154
155 fd = open(path, O_RDONLY);
156 if (fd == -1)
157 return -1;
158
159 sret = read(fd, alias->unit, UNIT_MAX_LEN);
160 if (sret < 0)
161 goto error;
162
163 close(fd);
164
165 alias->unit[sret] = '\0';
166
167 return 0;
168error:
169 close(fd);
170 alias->unit[0] = '\0';
171 return -1;
172}
173
174static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
175{
176 struct perf_pmu_alias *alias;
177 char buf[256];
178 int ret;
179
180 ret = fread(buf, 1, sizeof(buf), file);
181 if (ret == 0)
182 return -EINVAL;
183 buf[ret] = 0;
184
185 alias = malloc(sizeof(*alias));
186 if (!alias)
187 return -ENOMEM;
188
189 INIT_LIST_HEAD(&alias->terms);
190 alias->scale = 1.0;
191 alias->unit[0] = '\0';
192
193 ret = parse_events_terms(&alias->terms, buf);
194 if (ret) {
195 free(alias);
196 return ret;
197 }
198
199 alias->name = strdup(name);
200 /*
201 * load unit name and scale if available
202 */
203 perf_pmu__parse_unit(alias, dir, name);
204 perf_pmu__parse_scale(alias, dir, name);
205
206 list_add_tail(&alias->list, list);
207
208 return 0;
209}
210
211/*
212 * Process all the sysfs attributes located under the directory
213 * specified in 'dir' parameter.
214 */
215static int pmu_aliases_parse(char *dir, struct list_head *head)
216{
217 struct dirent *evt_ent;
218 DIR *event_dir;
219 size_t len;
220 int ret = 0;
221
222 event_dir = opendir(dir);
223 if (!event_dir)
224 return -EINVAL;
225
226 while (!ret && (evt_ent = readdir(event_dir))) {
227 char path[PATH_MAX];
228 char *name = evt_ent->d_name;
229 FILE *file;
230
231 if (!strcmp(name, ".") || !strcmp(name, ".."))
232 continue;
233
234 /*
235 * skip .unit and .scale info files
236 * parsed in perf_pmu__new_alias()
237 */
238 len = strlen(name);
239 if (len > 5 && !strcmp(name + len - 5, ".unit"))
240 continue;
241 if (len > 6 && !strcmp(name + len - 6, ".scale"))
242 continue;
243
244 snprintf(path, PATH_MAX, "%s/%s", dir, name);
245
246 ret = -EINVAL;
247 file = fopen(path, "r");
248 if (!file)
249 break;
250
251 ret = perf_pmu__new_alias(head, dir, name, file);
252 fclose(file);
253 }
254
255 closedir(event_dir);
256 return ret;
257}
258
259/*
260 * Reading the pmu event aliases definition, which should be located at:
261 * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
262 */
263static int pmu_aliases(const char *name, struct list_head *head)
264{
265 struct stat st;
266 char path[PATH_MAX];
267 const char *sysfs = sysfs__mountpoint();
268
269 if (!sysfs)
270 return -1;
271
272 snprintf(path, PATH_MAX,
273 "%s/bus/event_source/devices/%s/events", sysfs, name);
274
275 if (stat(path, &st) < 0)
276 return 0; /* no error if 'events' does not exist */
277
278 if (pmu_aliases_parse(path, head))
279 return -1;
280
281 return 0;
282}
283
284static int pmu_alias_terms(struct perf_pmu_alias *alias,
285 struct list_head *terms)
286{
287 struct parse_events_term *term, *clone;
288 LIST_HEAD(list);
289 int ret;
290
291 list_for_each_entry(term, &alias->terms, list) {
292 ret = parse_events_term__clone(&clone, term);
293 if (ret) {
294 parse_events__free_terms(&list);
295 return ret;
296 }
297 list_add_tail(&clone->list, &list);
298 }
299 list_splice(&list, terms);
300 return 0;
301}
302
303/*
304 * Reading/parsing the default pmu type value, which should be
305 * located at:
306 * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
307 */
308static int pmu_type(const char *name, __u32 *type)
309{
310 struct stat st;
311 char path[PATH_MAX];
312 FILE *file;
313 int ret = 0;
314 const char *sysfs = sysfs__mountpoint();
315
316 if (!sysfs)
317 return -1;
318
319 snprintf(path, PATH_MAX,
320 "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
321
322 if (stat(path, &st) < 0)
323 return -1;
324
325 file = fopen(path, "r");
326 if (!file)
327 return -EINVAL;
328
329 if (1 != fscanf(file, "%u", type))
330 ret = -1;
331
332 fclose(file);
333 return ret;
334}
335
336/* Add all pmus in sysfs to pmu list: */
337static void pmu_read_sysfs(void)
338{
339 char path[PATH_MAX];
340 DIR *dir;
341 struct dirent *dent;
342 const char *sysfs = sysfs__mountpoint();
343
344 if (!sysfs)
345 return;
346
347 snprintf(path, PATH_MAX,
348 "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
349
350 dir = opendir(path);
351 if (!dir)
352 return;
353
354 while ((dent = readdir(dir))) {
355 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
356 continue;
357 /* add to static LIST_HEAD(pmus): */
358 perf_pmu__find(dent->d_name);
359 }
360
361 closedir(dir);
362}
363
364static struct cpu_map *pmu_cpumask(const char *name)
365{
366 struct stat st;
367 char path[PATH_MAX];
368 FILE *file;
369 struct cpu_map *cpus;
370 const char *sysfs = sysfs__mountpoint();
371
372 if (!sysfs)
373 return NULL;
374
375 snprintf(path, PATH_MAX,
376 "%s/bus/event_source/devices/%s/cpumask", sysfs, name);
377
378 if (stat(path, &st) < 0)
379 return NULL;
380
381 file = fopen(path, "r");
382 if (!file)
383 return NULL;
384
385 cpus = cpu_map__read(file);
386 fclose(file);
387 return cpus;
388}
389
390static struct perf_pmu *pmu_lookup(const char *name)
391{
392 struct perf_pmu *pmu;
393 LIST_HEAD(format);
394 LIST_HEAD(aliases);
395 __u32 type;
396
397 /*
398 * The pmu data we store & need consists of the pmu
399 * type value and format definitions. Load both right
400 * now.
401 */
402 if (pmu_format(name, &format))
403 return NULL;
404
405 if (pmu_aliases(name, &aliases))
406 return NULL;
407
408 if (pmu_type(name, &type))
409 return NULL;
410
411 pmu = zalloc(sizeof(*pmu));
412 if (!pmu)
413 return NULL;
414
415 pmu->cpus = pmu_cpumask(name);
416
417 INIT_LIST_HEAD(&pmu->format);
418 INIT_LIST_HEAD(&pmu->aliases);
419 list_splice(&format, &pmu->format);
420 list_splice(&aliases, &pmu->aliases);
421 pmu->name = strdup(name);
422 pmu->type = type;
423 list_add_tail(&pmu->list, &pmus);
424 return pmu;
425}
426
427static struct perf_pmu *pmu_find(const char *name)
428{
429 struct perf_pmu *pmu;
430
431 list_for_each_entry(pmu, &pmus, list)
432 if (!strcmp(pmu->name, name))
433 return pmu;
434
435 return NULL;
436}
437
438struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
439{
440 /*
441 * pmu iterator: If pmu is NULL, we start at the begin,
442 * otherwise return the next pmu. Returns NULL on end.
443 */
444 if (!pmu) {
445 pmu_read_sysfs();
446 pmu = list_prepare_entry(pmu, &pmus, list);
447 }
448 list_for_each_entry_continue(pmu, &pmus, list)
449 return pmu;
450 return NULL;
451}
452
453struct perf_pmu *perf_pmu__find(const char *name)
454{
455 struct perf_pmu *pmu;
456
457 /*
458 * Once PMU is loaded it stays in the list,
459 * so we keep us from multiple reading/parsing
460 * the pmu format definitions.
461 */
462 pmu = pmu_find(name);
463 if (pmu)
464 return pmu;
465
466 return pmu_lookup(name);
467}
468
469static struct perf_pmu_format *
470pmu_find_format(struct list_head *formats, char *name)
471{
472 struct perf_pmu_format *format;
473
474 list_for_each_entry(format, formats, list)
475 if (!strcmp(format->name, name))
476 return format;
477
478 return NULL;
479}
480
481/*
482 * Returns value based on the format definition (format parameter)
483 * and unformated value (value parameter).
484 *
485 * TODO maybe optimize a little ;)
486 */
487static __u64 pmu_format_value(unsigned long *format, __u64 value)
488{
489 unsigned long fbit, vbit;
490 __u64 v = 0;
491
492 for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
493
494 if (!test_bit(fbit, format))
495 continue;
496
497 if (!(value & (1llu << vbit++)))
498 continue;
499
500 v |= (1llu << fbit);
501 }
502
503 return v;
504}
505
506/*
507 * Setup one of config[12] attr members based on the
508 * user input data - term parameter.
509 */
510static int pmu_config_term(struct list_head *formats,
511 struct perf_event_attr *attr,
512 struct parse_events_term *term)
513{
514 struct perf_pmu_format *format;
515 __u64 *vp;
516
517 /*
518 * Support only for hardcoded and numnerial terms.
519 * Hardcoded terms should be already in, so nothing
520 * to be done for them.
521 */
522 if (parse_events__is_hardcoded_term(term))
523 return 0;
524
525 if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM)
526 return -EINVAL;
527
528 format = pmu_find_format(formats, term->config);
529 if (!format)
530 return -EINVAL;
531
532 switch (format->value) {
533 case PERF_PMU_FORMAT_VALUE_CONFIG:
534 vp = &attr->config;
535 break;
536 case PERF_PMU_FORMAT_VALUE_CONFIG1:
537 vp = &attr->config1;
538 break;
539 case PERF_PMU_FORMAT_VALUE_CONFIG2:
540 vp = &attr->config2;
541 break;
542 default:
543 return -EINVAL;
544 }
545
546 /*
547 * XXX If we ever decide to go with string values for
548 * non-hardcoded terms, here's the place to translate
549 * them into value.
550 */
551 *vp |= pmu_format_value(format->bits, term->val.num);
552 return 0;
553}
554
555int perf_pmu__config_terms(struct list_head *formats,
556 struct perf_event_attr *attr,
557 struct list_head *head_terms)
558{
559 struct parse_events_term *term;
560
561 list_for_each_entry(term, head_terms, list)
562 if (pmu_config_term(formats, attr, term))
563 return -EINVAL;
564
565 return 0;
566}
567
568/*
569 * Configures event's 'attr' parameter based on the:
570 * 1) users input - specified in terms parameter
571 * 2) pmu format definitions - specified by pmu parameter
572 */
573int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
574 struct list_head *head_terms)
575{
576 attr->type = pmu->type;
577 return perf_pmu__config_terms(&pmu->format, attr, head_terms);
578}
579
580static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
581 struct parse_events_term *term)
582{
583 struct perf_pmu_alias *alias;
584 char *name;
585
586 if (parse_events__is_hardcoded_term(term))
587 return NULL;
588
589 if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
590 if (term->val.num != 1)
591 return NULL;
592 if (pmu_find_format(&pmu->format, term->config))
593 return NULL;
594 name = term->config;
595 } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
596 if (strcasecmp(term->config, "event"))
597 return NULL;
598 name = term->val.str;
599 } else {
600 return NULL;
601 }
602
603 list_for_each_entry(alias, &pmu->aliases, list) {
604 if (!strcasecmp(alias->name, name))
605 return alias;
606 }
607 return NULL;
608}
609
610
611static int check_unit_scale(struct perf_pmu_alias *alias,
612 const char **unit, double *scale)
613{
614 /*
615 * Only one term in event definition can
616 * define unit and scale, fail if there's
617 * more than one.
618 */
619 if ((*unit && alias->unit) ||
620 (*scale && alias->scale))
621 return -EINVAL;
622
623 if (alias->unit)
624 *unit = alias->unit;
625
626 if (alias->scale)
627 *scale = alias->scale;
628
629 return 0;
630}
631
632/*
633 * Find alias in the terms list and replace it with the terms
634 * defined for the alias
635 */
636int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
637 const char **unit, double *scale)
638{
639 struct parse_events_term *term, *h;
640 struct perf_pmu_alias *alias;
641 int ret;
642
643 /*
644 * Mark unit and scale as not set
645 * (different from default values, see below)
646 */
647 *unit = NULL;
648 *scale = 0.0;
649
650 list_for_each_entry_safe(term, h, head_terms, list) {
651 alias = pmu_find_alias(pmu, term);
652 if (!alias)
653 continue;
654 ret = pmu_alias_terms(alias, &term->list);
655 if (ret)
656 return ret;
657
658 ret = check_unit_scale(alias, unit, scale);
659 if (ret)
660 return ret;
661
662 list_del(&term->list);
663 free(term);
664 }
665
666 /*
667 * if no unit or scale foundin aliases, then
668 * set defaults as for evsel
669 * unit cannot left to NULL
670 */
671 if (*unit == NULL)
672 *unit = "";
673
674 if (*scale == 0.0)
675 *scale = 1.0;
676
677 return 0;
678}
679
680int perf_pmu__new_format(struct list_head *list, char *name,
681 int config, unsigned long *bits)
682{
683 struct perf_pmu_format *format;
684
685 format = zalloc(sizeof(*format));
686 if (!format)
687 return -ENOMEM;
688
689 format->name = strdup(name);
690 format->value = config;
691 memcpy(format->bits, bits, sizeof(format->bits));
692
693 list_add_tail(&format->list, list);
694 return 0;
695}
696
697void perf_pmu__set_format(unsigned long *bits, long from, long to)
698{
699 long b;
700
701 if (!to)
702 to = from;
703
704 memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
705 for (b = from; b <= to; b++)
706 set_bit(b, bits);
707}
708
709static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
710 struct perf_pmu_alias *alias)
711{
712 snprintf(buf, len, "%s/%s/", pmu->name, alias->name);
713 return buf;
714}
715
716static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
717 struct perf_pmu_alias *alias)
718{
719 snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
720 return buf;
721}
722
723static int cmp_string(const void *a, const void *b)
724{
725 const char * const *as = a;
726 const char * const *bs = b;
727 return strcmp(*as, *bs);
728}
729
730void print_pmu_events(const char *event_glob, bool name_only)
731{
732 struct perf_pmu *pmu;
733 struct perf_pmu_alias *alias;
734 char buf[1024];
735 int printed = 0;
736 int len, j;
737 char **aliases;
738
739 pmu = NULL;
740 len = 0;
741 while ((pmu = perf_pmu__scan(pmu)) != NULL)
742 list_for_each_entry(alias, &pmu->aliases, list)
743 len++;
744 aliases = malloc(sizeof(char *) * len);
745 if (!aliases)
746 return;
747 pmu = NULL;
748 j = 0;
749 while ((pmu = perf_pmu__scan(pmu)) != NULL)
750 list_for_each_entry(alias, &pmu->aliases, list) {
751 char *name = format_alias(buf, sizeof(buf), pmu, alias);
752 bool is_cpu = !strcmp(pmu->name, "cpu");
753
754 if (event_glob != NULL &&
755 !(strglobmatch(name, event_glob) ||
756 (!is_cpu && strglobmatch(alias->name,
757 event_glob))))
758 continue;
759 aliases[j] = name;
760 if (is_cpu && !name_only)
761 aliases[j] = format_alias_or(buf, sizeof(buf),
762 pmu, alias);
763 aliases[j] = strdup(aliases[j]);
764 j++;
765 }
766 len = j;
767 qsort(aliases, len, sizeof(char *), cmp_string);
768 for (j = 0; j < len; j++) {
769 if (name_only) {
770 printf("%s ", aliases[j]);
771 continue;
772 }
773 printf(" %-50s [Kernel PMU event]\n", aliases[j]);
774 zfree(&aliases[j]);
775 printed++;
776 }
777 if (printed)
778 printf("\n");
779 free(aliases);
780}
781
782bool pmu_have_event(const char *pname, const char *name)
783{
784 struct perf_pmu *pmu;
785 struct perf_pmu_alias *alias;
786
787 pmu = NULL;
788 while ((pmu = perf_pmu__scan(pmu)) != NULL) {
789 if (strcmp(pname, pmu->name))
790 continue;
791 list_for_each_entry(alias, &pmu->aliases, list)
792 if (!strcmp(alias->name, name))
793 return true;
794 }
795 return false;
796}
1
2#include <linux/list.h>
3#include <sys/types.h>
4#include <sys/stat.h>
5#include <unistd.h>
6#include <stdio.h>
7#include <dirent.h>
8#include "sysfs.h"
9#include "util.h"
10#include "pmu.h"
11#include "parse-events.h"
12
13int perf_pmu_parse(struct list_head *list, char *name);
14extern FILE *perf_pmu_in;
15
16static LIST_HEAD(pmus);
17
18/*
19 * Parse & process all the sysfs attributes located under
20 * the directory specified in 'dir' parameter.
21 */
22static int pmu_format_parse(char *dir, struct list_head *head)
23{
24 struct dirent *evt_ent;
25 DIR *format_dir;
26 int ret = 0;
27
28 format_dir = opendir(dir);
29 if (!format_dir)
30 return -EINVAL;
31
32 while (!ret && (evt_ent = readdir(format_dir))) {
33 char path[PATH_MAX];
34 char *name = evt_ent->d_name;
35 FILE *file;
36
37 if (!strcmp(name, ".") || !strcmp(name, ".."))
38 continue;
39
40 snprintf(path, PATH_MAX, "%s/%s", dir, name);
41
42 ret = -EINVAL;
43 file = fopen(path, "r");
44 if (!file)
45 break;
46
47 perf_pmu_in = file;
48 ret = perf_pmu_parse(head, name);
49 fclose(file);
50 }
51
52 closedir(format_dir);
53 return ret;
54}
55
56/*
57 * Reading/parsing the default pmu format definition, which should be
58 * located at:
59 * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
60 */
61static int pmu_format(char *name, struct list_head *format)
62{
63 struct stat st;
64 char path[PATH_MAX];
65 const char *sysfs;
66
67 sysfs = sysfs_find_mountpoint();
68 if (!sysfs)
69 return -1;
70
71 snprintf(path, PATH_MAX,
72 "%s/bus/event_source/devices/%s/format", sysfs, name);
73
74 if (stat(path, &st) < 0)
75 return -1;
76
77 if (pmu_format_parse(path, format))
78 return -1;
79
80 return 0;
81}
82
83/*
84 * Reading/parsing the default pmu type value, which should be
85 * located at:
86 * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
87 */
88static int pmu_type(char *name, __u32 *type)
89{
90 struct stat st;
91 char path[PATH_MAX];
92 const char *sysfs;
93 FILE *file;
94 int ret = 0;
95
96 sysfs = sysfs_find_mountpoint();
97 if (!sysfs)
98 return -1;
99
100 snprintf(path, PATH_MAX,
101 "%s/bus/event_source/devices/%s/type", sysfs, name);
102
103 if (stat(path, &st) < 0)
104 return -1;
105
106 file = fopen(path, "r");
107 if (!file)
108 return -EINVAL;
109
110 if (1 != fscanf(file, "%u", type))
111 ret = -1;
112
113 fclose(file);
114 return ret;
115}
116
117static struct perf_pmu *pmu_lookup(char *name)
118{
119 struct perf_pmu *pmu;
120 LIST_HEAD(format);
121 __u32 type;
122
123 /*
124 * The pmu data we store & need consists of the pmu
125 * type value and format definitions. Load both right
126 * now.
127 */
128 if (pmu_format(name, &format))
129 return NULL;
130
131 if (pmu_type(name, &type))
132 return NULL;
133
134 pmu = zalloc(sizeof(*pmu));
135 if (!pmu)
136 return NULL;
137
138 INIT_LIST_HEAD(&pmu->format);
139 list_splice(&format, &pmu->format);
140 pmu->name = strdup(name);
141 pmu->type = type;
142 return pmu;
143}
144
145static struct perf_pmu *pmu_find(char *name)
146{
147 struct perf_pmu *pmu;
148
149 list_for_each_entry(pmu, &pmus, list)
150 if (!strcmp(pmu->name, name))
151 return pmu;
152
153 return NULL;
154}
155
156struct perf_pmu *perf_pmu__find(char *name)
157{
158 struct perf_pmu *pmu;
159
160 /*
161 * Once PMU is loaded it stays in the list,
162 * so we keep us from multiple reading/parsing
163 * the pmu format definitions.
164 */
165 pmu = pmu_find(name);
166 if (pmu)
167 return pmu;
168
169 return pmu_lookup(name);
170}
171
172static struct perf_pmu__format*
173pmu_find_format(struct list_head *formats, char *name)
174{
175 struct perf_pmu__format *format;
176
177 list_for_each_entry(format, formats, list)
178 if (!strcmp(format->name, name))
179 return format;
180
181 return NULL;
182}
183
184/*
185 * Returns value based on the format definition (format parameter)
186 * and unformated value (value parameter).
187 *
188 * TODO maybe optimize a little ;)
189 */
190static __u64 pmu_format_value(unsigned long *format, __u64 value)
191{
192 unsigned long fbit, vbit;
193 __u64 v = 0;
194
195 for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
196
197 if (!test_bit(fbit, format))
198 continue;
199
200 if (!(value & (1llu << vbit++)))
201 continue;
202
203 v |= (1llu << fbit);
204 }
205
206 return v;
207}
208
209/*
210 * Setup one of config[12] attr members based on the
211 * user input data - temr parameter.
212 */
213static int pmu_config_term(struct list_head *formats,
214 struct perf_event_attr *attr,
215 struct parse_events__term *term)
216{
217 struct perf_pmu__format *format;
218 __u64 *vp;
219
220 /*
221 * Support only for hardcoded and numnerial terms.
222 * Hardcoded terms should be already in, so nothing
223 * to be done for them.
224 */
225 if (parse_events__is_hardcoded_term(term))
226 return 0;
227
228 if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM)
229 return -EINVAL;
230
231 format = pmu_find_format(formats, term->config);
232 if (!format)
233 return -EINVAL;
234
235 switch (format->value) {
236 case PERF_PMU_FORMAT_VALUE_CONFIG:
237 vp = &attr->config;
238 break;
239 case PERF_PMU_FORMAT_VALUE_CONFIG1:
240 vp = &attr->config1;
241 break;
242 case PERF_PMU_FORMAT_VALUE_CONFIG2:
243 vp = &attr->config2;
244 break;
245 default:
246 return -EINVAL;
247 }
248
249 /*
250 * XXX If we ever decide to go with string values for
251 * non-hardcoded terms, here's the place to translate
252 * them into value.
253 */
254 *vp |= pmu_format_value(format->bits, term->val.num);
255 return 0;
256}
257
258static int pmu_config(struct list_head *formats, struct perf_event_attr *attr,
259 struct list_head *head_terms)
260{
261 struct parse_events__term *term;
262
263 list_for_each_entry(term, head_terms, list)
264 if (pmu_config_term(formats, attr, term))
265 return -EINVAL;
266
267 return 0;
268}
269
270/*
271 * Configures event's 'attr' parameter based on the:
272 * 1) users input - specified in terms parameter
273 * 2) pmu format definitions - specified by pmu parameter
274 */
275int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
276 struct list_head *head_terms)
277{
278 attr->type = pmu->type;
279 return pmu_config(&pmu->format, attr, head_terms);
280}
281
282int perf_pmu__new_format(struct list_head *list, char *name,
283 int config, unsigned long *bits)
284{
285 struct perf_pmu__format *format;
286
287 format = zalloc(sizeof(*format));
288 if (!format)
289 return -ENOMEM;
290
291 format->name = strdup(name);
292 format->value = config;
293 memcpy(format->bits, bits, sizeof(format->bits));
294
295 list_add_tail(&format->list, list);
296 return 0;
297}
298
299void perf_pmu__set_format(unsigned long *bits, long from, long to)
300{
301 long b;
302
303 if (!to)
304 to = from;
305
306 memset(bits, 0, BITS_TO_LONGS(PERF_PMU_FORMAT_BITS));
307 for (b = from; b <= to; b++)
308 set_bit(b, bits);
309}
310
311/* Simulated format definitions. */
312static struct test_format {
313 const char *name;
314 const char *value;
315} test_formats[] = {
316 { "krava01", "config:0-1,62-63\n", },
317 { "krava02", "config:10-17\n", },
318 { "krava03", "config:5\n", },
319 { "krava11", "config1:0,2,4,6,8,20-28\n", },
320 { "krava12", "config1:63\n", },
321 { "krava13", "config1:45-47\n", },
322 { "krava21", "config2:0-3,10-13,20-23,30-33,40-43,50-53,60-63\n", },
323 { "krava22", "config2:8,18,48,58\n", },
324 { "krava23", "config2:28-29,38\n", },
325};
326
327#define TEST_FORMATS_CNT (sizeof(test_formats) / sizeof(struct test_format))
328
329/* Simulated users input. */
330static struct parse_events__term test_terms[] = {
331 {
332 .config = (char *) "krava01",
333 .val.num = 15,
334 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
335 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
336 },
337 {
338 .config = (char *) "krava02",
339 .val.num = 170,
340 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
341 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
342 },
343 {
344 .config = (char *) "krava03",
345 .val.num = 1,
346 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
347 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
348 },
349 {
350 .config = (char *) "krava11",
351 .val.num = 27,
352 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
353 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
354 },
355 {
356 .config = (char *) "krava12",
357 .val.num = 1,
358 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
359 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
360 },
361 {
362 .config = (char *) "krava13",
363 .val.num = 2,
364 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
365 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
366 },
367 {
368 .config = (char *) "krava21",
369 .val.num = 119,
370 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
371 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
372 },
373 {
374 .config = (char *) "krava22",
375 .val.num = 11,
376 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
377 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
378 },
379 {
380 .config = (char *) "krava23",
381 .val.num = 2,
382 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
383 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
384 },
385};
386#define TERMS_CNT (sizeof(test_terms) / sizeof(struct parse_events__term))
387
388/*
389 * Prepare format directory data, exported by kernel
390 * at /sys/bus/event_source/devices/<dev>/format.
391 */
392static char *test_format_dir_get(void)
393{
394 static char dir[PATH_MAX];
395 unsigned int i;
396
397 snprintf(dir, PATH_MAX, "/tmp/perf-pmu-test-format-XXXXXX");
398 if (!mkdtemp(dir))
399 return NULL;
400
401 for (i = 0; i < TEST_FORMATS_CNT; i++) {
402 static char name[PATH_MAX];
403 struct test_format *format = &test_formats[i];
404 FILE *file;
405
406 snprintf(name, PATH_MAX, "%s/%s", dir, format->name);
407
408 file = fopen(name, "w");
409 if (!file)
410 return NULL;
411
412 if (1 != fwrite(format->value, strlen(format->value), 1, file))
413 break;
414
415 fclose(file);
416 }
417
418 return dir;
419}
420
421/* Cleanup format directory. */
422static int test_format_dir_put(char *dir)
423{
424 char buf[PATH_MAX];
425 snprintf(buf, PATH_MAX, "rm -f %s/*\n", dir);
426 if (system(buf))
427 return -1;
428
429 snprintf(buf, PATH_MAX, "rmdir %s\n", dir);
430 return system(buf);
431}
432
433static struct list_head *test_terms_list(void)
434{
435 static LIST_HEAD(terms);
436 unsigned int i;
437
438 for (i = 0; i < TERMS_CNT; i++)
439 list_add_tail(&test_terms[i].list, &terms);
440
441 return &terms;
442}
443
444#undef TERMS_CNT
445
446int perf_pmu__test(void)
447{
448 char *format = test_format_dir_get();
449 LIST_HEAD(formats);
450 struct list_head *terms = test_terms_list();
451 int ret;
452
453 if (!format)
454 return -EINVAL;
455
456 do {
457 struct perf_event_attr attr;
458
459 memset(&attr, 0, sizeof(attr));
460
461 ret = pmu_format_parse(format, &formats);
462 if (ret)
463 break;
464
465 ret = pmu_config(&formats, &attr, terms);
466 if (ret)
467 break;
468
469 ret = -EINVAL;
470
471 if (attr.config != 0xc00000000002a823)
472 break;
473 if (attr.config1 != 0x8000400000000145)
474 break;
475 if (attr.config2 != 0x0400000020041d07)
476 break;
477
478 ret = 0;
479 } while (0);
480
481 test_format_dir_put(format);
482 return ret;
483}