summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/pmu.c
blob: 7a811eb61f75fc9b00205fd778c30cc417b0f887 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
#include <linux/list.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <dirent.h>
#include <api/fs/fs.h>
#include <locale.h>
#include "util.h"
#include "pmu.h"
#include "parse-events.h"
#include "cpumap.h"

#define UNIT_MAX_LEN	31 /* max length for event unit name */

struct perf_pmu_alias {
	char *name;
	struct list_head terms;
	struct list_head list;
	char unit[UNIT_MAX_LEN+1];
	double scale;
};

struct perf_pmu_format {
	char *name;
	int value;
	DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
	struct list_head list;
};

#define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"

int perf_pmu_parse(struct list_head *list, char *name);
extern FILE *perf_pmu_in;

static LIST_HEAD(pmus);

/*
 * Parse & process all the sysfs attributes located under
 * the directory specified in 'dir' parameter.
 */
int perf_pmu__format_parse(char *dir, struct list_head *head)
{
	struct dirent *evt_ent;
	DIR *format_dir;
	int ret = 0;

	format_dir = opendir(dir);
	if (!format_dir)
		return -EINVAL;

	while (!ret && (evt_ent = readdir(format_dir))) {
		char path[PATH_MAX];
		char *name = evt_ent->d_name;
		FILE *file;

		if (!strcmp(name, ".") || !strcmp(name, ".."))
			continue;

		snprintf(path, PATH_MAX, "%s/%s", dir, name);

		ret = -EINVAL;
		file = fopen(path, "r");
		if (!file)
			break;

		perf_pmu_in = file;
		ret = perf_pmu_parse(head, name);
		fclose(file);
	}

	closedir(format_dir);
	return ret;
}

/*
 * Reading/parsing the default pmu format definition, which should be
 * located at:
 * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
 */
static int pmu_format(const char *name, struct list_head *format)
{
	struct stat st;
	char path[PATH_MAX];
	const char *sysfs = sysfs__mountpoint();

	if (!sysfs)
		return -1;

	snprintf(path, PATH_MAX,
		 "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);

	if (stat(path, &st) < 0)
		return 0;	/* no error if format does not exist */

	if (perf_pmu__format_parse(path, format))
		return -1;

	return 0;
}

static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *name)
{
	struct stat st;
	ssize_t sret;
	char scale[128];
	int fd, ret = -1;
	char path[PATH_MAX];
	const char *lc;

	snprintf(path, PATH_MAX, "%s/%s.scale", dir, name);

	fd = open(path, O_RDONLY);
	if (fd == -1)
		return -1;

	if (fstat(fd, &st) < 0)
		goto error;

	sret = read(fd, scale, sizeof(scale)-1);
	if (sret < 0)
		goto error;

	scale[sret] = '\0';
	/*
	 * save current locale
	 */
	lc = setlocale(LC_NUMERIC, NULL);

	/*
	 * force to C locale to ensure kernel
	 * scale string is converted correctly.
	 * kernel uses default C locale.
	 */
	setlocale(LC_NUMERIC, "C");

	alias->scale = strtod(scale, NULL);

	/* restore locale */
	setlocale(LC_NUMERIC, lc);

	ret = 0;
error:
	close(fd);
	return ret;
}

static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, char *dir, char *name)
{
	char path[PATH_MAX];
	ssize_t sret;
	int fd;

	snprintf(path, PATH_MAX, "%s/%s.unit", dir, name);

	fd = open(path, O_RDONLY);
	if (fd == -1)
		return -1;

		sret = read(fd, alias->unit, UNIT_MAX_LEN);
	if (sret < 0)
		goto error;

	close(fd);

	alias->unit[sret] = '\0';

	return 0;
error:
	close(fd);
	alias->unit[0] = '\0';
	return -1;
}

static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
{
	struct perf_pmu_alias *alias;
	char buf[256];
	int ret;

	ret = fread(buf, 1, sizeof(buf), file);
	if (ret == 0)
		return -EINVAL;
	buf[ret] = 0;

	alias = malloc(sizeof(*alias));
	if (!alias)
		return -ENOMEM;

	INIT_LIST_HEAD(&alias->terms);
	alias->scale = 1.0;
	alias->unit[0] = '\0';

	ret = parse_events_terms(&alias->terms, buf);
	if (ret) {
		free(alias);
		return ret;
	}

	alias->name = strdup(name);
	/*
	 * load unit name and scale if available
	 */
	perf_pmu__parse_unit(alias, dir, name);
	perf_pmu__parse_scale(alias, dir, name);

	list_add_tail(&alias->list, list);

	return 0;
}

/*
 * Process all the sysfs attributes located under the directory
 * specified in 'dir' parameter.
 */
static int pmu_aliases_parse(char *dir, struct list_head *head)
{
	struct dirent *evt_ent;
	DIR *event_dir;
	size_t len;
	int ret = 0;

	event_dir = opendir(dir);
	if (!event_dir)
		return -EINVAL;

	while (!ret && (evt_ent = readdir(event_dir))) {
		char path[PATH_MAX];
		char *name = evt_ent->d_name;
		FILE *file;

		if (!strcmp(name, ".") || !strcmp(name, ".."))
			continue;

		/*
		 * skip .unit and .scale info files
		 * parsed in perf_pmu__new_alias()
		 */
		len = strlen(name);
		if (len > 5 && !strcmp(name + len - 5, ".unit"))
			continue;
		if (len > 6 && !strcmp(name + len - 6, ".scale"))
			continue;

		snprintf(path, PATH_MAX, "%s/%s", dir, name);

		ret = -EINVAL;
		file = fopen(path, "r");
		if (!file)
			break;

		ret = perf_pmu__new_alias(head, dir, name, file);
		fclose(file);
	}

	closedir(event_dir);
	return ret;
}

/*
 * Reading the pmu event aliases definition, which should be located at:
 * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
 */
static int pmu_aliases(const char *name, struct list_head *head)
{
	struct stat st;
	char path[PATH_MAX];
	const char *sysfs = sysfs__mountpoint();

	if (!sysfs)
		return -1;

	snprintf(path, PATH_MAX,
		 "%s/bus/event_source/devices/%s/events", sysfs, name);

	if (stat(path, &st) < 0)
		return 0;	 /* no error if 'events' does not exist */

	if (pmu_aliases_parse(path, head))
		return -1;

	return 0;
}

static int pmu_alias_terms(struct perf_pmu_alias *alias,
			   struct list_head *terms)
{
	struct parse_events_term *term, *cloned;
	LIST_HEAD(list);
	int ret;

	list_for_each_entry(term, &alias->terms, list) {
		ret = parse_events_term__clone(&cloned, term);
		if (ret) {
			parse_events__free_terms(&list);
			return ret;
		}
		list_add_tail(&cloned->list, &list);
	}
	list_splice(&list, terms);
	return 0;
}

/*
 * Reading/parsing the default pmu type value, which should be
 * located at:
 * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
 */
static int pmu_type(const char *name, __u32 *type)
{
	struct stat st;
	char path[PATH_MAX];
	FILE *file;
	int ret = 0;
	const char *sysfs = sysfs__mountpoint();

	if (!sysfs)
		return -1;

	snprintf(path, PATH_MAX,
		 "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);

	if (stat(path, &st) < 0)
		return -1;

	file = fopen(path, "r");
	if (!file)
		return -EINVAL;

	if (1 != fscanf(file, "%u", type))
		ret = -1;

	fclose(file);
	return ret;
}

/* Add all pmus in sysfs to pmu list: */
static void pmu_read_sysfs(void)
{
	char path[PATH_MAX];
	DIR *dir;
	struct dirent *dent;
	const char *sysfs = sysfs__mountpoint();

	if (!sysfs)
		return;

	snprintf(path, PATH_MAX,
		 "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);

	dir = opendir(path);
	if (!dir)
		return;

	while ((dent = readdir(dir))) {
		if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
			continue;
		/* add to static LIST_HEAD(pmus): */
		perf_pmu__find(dent->d_name);
	}

	closedir(dir);
}

static struct cpu_map *pmu_cpumask(const char *name)
{
	struct stat st;
	char path[PATH_MAX];
	FILE *file;
	struct cpu_map *cpus;
	const char *sysfs = sysfs__mountpoint();

	if (!sysfs)
		return NULL;

	snprintf(path, PATH_MAX,
		 "%s/bus/event_source/devices/%s/cpumask", sysfs, name);

	if (stat(path, &st) < 0)
		return NULL;

	file = fopen(path, "r");
	if (!file)
		return NULL;

	cpus = cpu_map__read(file);
	fclose(file);
	return cpus;
}

static struct perf_pmu *pmu_lookup(const char *name)
{
	struct perf_pmu *pmu;
	LIST_HEAD(format);
	LIST_HEAD(aliases);
	__u32 type;

	/*
	 * The pmu data we store & need consists of the pmu
	 * type value and format definitions. Load both right
	 * now.
	 */
	if (pmu_format(name, &format))
		return NULL;

	if (pmu_aliases(name, &aliases))
		return NULL;

	if (pmu_type(name, &type))
		return NULL;

	pmu = zalloc(sizeof(*pmu));
	if (!pmu)
		return NULL;

	pmu->cpus = pmu_cpumask(name);

	INIT_LIST_HEAD(&pmu->format);
	INIT_LIST_HEAD(&pmu->aliases);
	list_splice(&format, &pmu->format);
	list_splice(&aliases, &pmu->aliases);
	pmu->name = strdup(name);
	pmu->type = type;
	list_add_tail(&pmu->list, &pmus);
	return pmu;
}

static struct perf_pmu *pmu_find(const char *name)
{
	struct perf_pmu *pmu;

	list_for_each_entry(pmu, &pmus, list)
		if (!strcmp(pmu->name, name))
			return pmu;

	return NULL;
}

struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
{
	/*
	 * pmu iterator: If pmu is NULL, we start at the begin,
	 * otherwise return the next pmu. Returns NULL on end.
	 */
	if (!pmu) {
		pmu_read_sysfs();
		pmu = list_prepare_entry(pmu, &pmus, list);
	}
	list_for_each_entry_continue(pmu, &pmus, list)
		return pmu;
	return NULL;
}

struct perf_pmu *perf_pmu__find(const char *name)
{
	struct perf_pmu *pmu;

	/*
	 * Once PMU is loaded it stays in the list,
	 * so we keep us from multiple reading/parsing
	 * the pmu format definitions.
	 */
	pmu = pmu_find(name);
	if (pmu)
		return pmu;

	return pmu_lookup(name);
}

static struct perf_pmu_format *
pmu_find_format(struct list_head *formats, char *name)
{
	struct perf_pmu_format *format;

	list_for_each_entry(format, formats, list)
		if (!strcmp(format->name, name))
			return format;

	return NULL;
}

/*
 * Returns value based on the format definition (format parameter)
 * and unformated value (value parameter).
 *
 * TODO maybe optimize a little ;)
 */
static __u64 pmu_format_value(unsigned long *format, __u64 value)
{
	unsigned long fbit, vbit;
	__u64 v = 0;

	for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {

		if (!test_bit(fbit, format))
			continue;

		if (!(value & (1llu << vbit++)))
			continue;

		v |= (1llu << fbit);
	}

	return v;
}

/*
 * Setup one of config[12] attr members based on the
 * user input data - term parameter.
 */
static int pmu_config_term(struct list_head *formats,
			   struct perf_event_attr *attr,
			   struct parse_events_term *term)
{
	struct perf_pmu_format *format;
	__u64 *vp;

	/*
	 * Support only for hardcoded and numnerial terms.
	 * Hardcoded terms should be already in, so nothing
	 * to be done for them.
	 */
	if (parse_events__is_hardcoded_term(term))
		return 0;

	if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM)
		return -EINVAL;

	format = pmu_find_format(formats, term->config);
	if (!format)
		return -EINVAL;

	switch (format->value) {
	case PERF_PMU_FORMAT_VALUE_CONFIG:
		vp = &attr->config;
		break;
	case PERF_PMU_FORMAT_VALUE_CONFIG1:
		vp = &attr->config1;
		break;
	case PERF_PMU_FORMAT_VALUE_CONFIG2:
		vp = &attr->config2;
		break;
	default:
		return -EINVAL;
	}

	/*
	 * XXX If we ever decide to go with string values for
	 * non-hardcoded terms, here's the place to translate
	 * them into value.
	 */
	*vp |= pmu_format_value(format->bits, term->val.num);
	return 0;
}

int perf_pmu__config_terms(struct list_head *formats,
			   struct perf_event_attr *attr,
			   struct list_head *head_terms)
{
	struct parse_events_term *term;

	list_for_each_entry(term, head_terms, list)
		if (pmu_config_term(formats, attr, term))
			return -EINVAL;

	return 0;
}

/*
 * Configures event's 'attr' parameter based on the:
 * 1) users input - specified in terms parameter
 * 2) pmu format definitions - specified by pmu parameter
 */
int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
		     struct list_head *head_terms)
{
	attr->type = pmu->type;
	return perf_pmu__config_terms(&pmu->format, attr, head_terms);
}

static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
					     struct parse_events_term *term)
{
	struct perf_pmu_alias *alias;
	char *name;

	if (parse_events__is_hardcoded_term(term))
		return NULL;

	if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
		if (term->val.num != 1)
			return NULL;
		if (pmu_find_format(&pmu->format, term->config))
			return NULL;
		name = term->config;
	} else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
		if (strcasecmp(term->config, "event"))
			return NULL;
		name = term->val.str;
	} else {
		return NULL;
	}

	list_for_each_entry(alias, &pmu->aliases, list) {
		if (!strcasecmp(alias->name, name))
			return alias;
	}
	return NULL;
}


static int check_unit_scale(struct perf_pmu_alias *alias,
			    const char **unit, double *scale)
{
	/*
	 * Only one term in event definition can
	 * define unit and scale, fail if there's
	 * more than one.
	 */
	if ((*unit && alias->unit) ||
	    (*scale && alias->scale))
		return -EINVAL;

	if (alias->unit)
		*unit = alias->unit;

	if (alias->scale)
		*scale = alias->scale;

	return 0;
}

/*
 * Find alias in the terms list and replace it with the terms
 * defined for the alias
 */
int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
			  const char **unit, double *scale)
{
	struct parse_events_term *term, *h;
	struct perf_pmu_alias *alias;
	int ret;

	/*
	 * Mark unit and scale as not set
	 * (different from default values, see below)
	 */
	*unit   = NULL;
	*scale  = 0.0;

	list_for_each_entry_safe(term, h, head_terms, list) {
		alias = pmu_find_alias(pmu, term);
		if (!alias)
			continue;
		ret = pmu_alias_terms(alias, &term->list);
		if (ret)
			return ret;

		ret = check_unit_scale(alias, unit, scale);
		if (ret)
			return ret;

		list_del(&term->list);
		free(term);
	}

	/*
	 * if no unit or scale foundin aliases, then
	 * set defaults as for evsel
	 * unit cannot left to NULL
	 */
	if (*unit == NULL)
		*unit   = "";

	if (*scale == 0.0)
		*scale  = 1.0;

	return 0;
}

int perf_pmu__new_format(struct list_head *list, char *name,
			 int config, unsigned long *bits)
{
	struct perf_pmu_format *format;

	format = zalloc(sizeof(*format));
	if (!format)
		return -ENOMEM;

	format->name = strdup(name);
	format->value = config;
	memcpy(format->bits, bits, sizeof(format->bits));

	list_add_tail(&format->list, list);
	return 0;
}

void perf_pmu__set_format(unsigned long *bits, long from, long to)
{
	long b;

	if (!to)
		to = from;

	memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
	for (b = from; b <= to; b++)
		set_bit(b, bits);
}

static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
			  struct perf_pmu_alias *alias)
{
	snprintf(buf, len, "%s/%s/", pmu->name, alias->name);
	return buf;
}

static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
			     struct perf_pmu_alias *alias)
{
	snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
	return buf;
}

static int cmp_string(const void *a, const void *b)
{
	const char * const *as = a;
	const char * const *bs = b;
	return strcmp(*as, *bs);
}

void print_pmu_events(const char *event_glob, bool name_only)
{
	struct perf_pmu *pmu;
	struct perf_pmu_alias *alias;
	char buf[1024];
	int printed = 0;
	int len, j;
	char **aliases;

	pmu = NULL;
	len = 0;
	while ((pmu = perf_pmu__scan(pmu)) != NULL)
		list_for_each_entry(alias, &pmu->aliases, list)
			len++;
	aliases = malloc(sizeof(char *) * len);
	if (!aliases)
		return;
	pmu = NULL;
	j = 0;
	while ((pmu = perf_pmu__scan(pmu)) != NULL)
		list_for_each_entry(alias, &pmu->aliases, list) {
			char *name = format_alias(buf, sizeof(buf), pmu, alias);
			bool is_cpu = !strcmp(pmu->name, "cpu");

			if (event_glob != NULL &&
			    !(strglobmatch(name, event_glob) ||
			      (!is_cpu && strglobmatch(alias->name,
						       event_glob))))
				continue;
			aliases[j] = name;
			if (is_cpu && !name_only)
				aliases[j] = format_alias_or(buf, sizeof(buf),
							      pmu, alias);
			aliases[j] = strdup(aliases[j]);
			j++;
		}
	len = j;
	qsort(aliases, len, sizeof(char *), cmp_string);
	for (j = 0; j < len; j++) {
		if (name_only) {
			printf("%s ", aliases[j]);
			continue;
		}
		printf("  %-50s [Kernel PMU event]\n", aliases[j]);
		zfree(&aliases[j]);
		printed++;
	}
	if (printed)
		printf("\n");
	free(aliases);
}

bool pmu_have_event(const char *pname, const char *name)
{
	struct perf_pmu *pmu;
	struct perf_pmu_alias *alias;

	pmu = NULL;
	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
		if (strcmp(pname, pmu->name))
			continue;
		list_for_each_entry(alias, &pmu->aliases, list)
			if (!strcmp(alias->name, name))
				return true;
	}
	return false;
}