xref: /openbmc/linux/tools/perf/util/parse-events.c (revision a36954f5)
1 #include <linux/hw_breakpoint.h>
2 #include <linux/err.h>
3 #include <dirent.h>
4 #include <errno.h>
5 #include <sys/ioctl.h>
6 #include <sys/param.h>
7 #include "term.h"
8 #include "../perf.h"
9 #include "evlist.h"
10 #include "evsel.h"
11 #include <subcmd/parse-options.h>
12 #include "parse-events.h"
13 #include <subcmd/exec-cmd.h>
14 #include "string2.h"
15 #include "strlist.h"
16 #include "symbol.h"
17 #include "cache.h"
18 #include "header.h"
19 #include "bpf-loader.h"
20 #include "debug.h"
21 #include <api/fs/tracing_path.h>
22 #include "parse-events-bison.h"
23 #define YY_EXTRA_TYPE int
24 #include "parse-events-flex.h"
25 #include "pmu.h"
26 #include "thread_map.h"
27 #include "cpumap.h"
28 #include "probe-file.h"
29 #include "asm/bug.h"
30 #include "util/parse-branch-options.h"
31 
32 #define MAX_NAME_LEN 100
33 
34 #ifdef PARSER_DEBUG
35 extern int parse_events_debug;
36 #endif
37 int parse_events_parse(void *data, void *scanner);
38 static int get_config_terms(struct list_head *head_config,
39 			    struct list_head *head_terms __maybe_unused);
40 
41 static struct perf_pmu_event_symbol *perf_pmu_events_list;
42 /*
43  * The variable indicates the number of supported pmu event symbols.
44  * 0 means not initialized and ready to init
45  * -1 means failed to init, don't try anymore
46  * >0 is the number of supported pmu event symbols
47  */
48 static int perf_pmu_events_list_num;
49 
50 struct event_symbol event_symbols_hw[PERF_COUNT_HW_MAX] = {
51 	[PERF_COUNT_HW_CPU_CYCLES] = {
52 		.symbol = "cpu-cycles",
53 		.alias  = "cycles",
54 	},
55 	[PERF_COUNT_HW_INSTRUCTIONS] = {
56 		.symbol = "instructions",
57 		.alias  = "",
58 	},
59 	[PERF_COUNT_HW_CACHE_REFERENCES] = {
60 		.symbol = "cache-references",
61 		.alias  = "",
62 	},
63 	[PERF_COUNT_HW_CACHE_MISSES] = {
64 		.symbol = "cache-misses",
65 		.alias  = "",
66 	},
67 	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = {
68 		.symbol = "branch-instructions",
69 		.alias  = "branches",
70 	},
71 	[PERF_COUNT_HW_BRANCH_MISSES] = {
72 		.symbol = "branch-misses",
73 		.alias  = "",
74 	},
75 	[PERF_COUNT_HW_BUS_CYCLES] = {
76 		.symbol = "bus-cycles",
77 		.alias  = "",
78 	},
79 	[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = {
80 		.symbol = "stalled-cycles-frontend",
81 		.alias  = "idle-cycles-frontend",
82 	},
83 	[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = {
84 		.symbol = "stalled-cycles-backend",
85 		.alias  = "idle-cycles-backend",
86 	},
87 	[PERF_COUNT_HW_REF_CPU_CYCLES] = {
88 		.symbol = "ref-cycles",
89 		.alias  = "",
90 	},
91 };
92 
93 struct event_symbol event_symbols_sw[PERF_COUNT_SW_MAX] = {
94 	[PERF_COUNT_SW_CPU_CLOCK] = {
95 		.symbol = "cpu-clock",
96 		.alias  = "",
97 	},
98 	[PERF_COUNT_SW_TASK_CLOCK] = {
99 		.symbol = "task-clock",
100 		.alias  = "",
101 	},
102 	[PERF_COUNT_SW_PAGE_FAULTS] = {
103 		.symbol = "page-faults",
104 		.alias  = "faults",
105 	},
106 	[PERF_COUNT_SW_CONTEXT_SWITCHES] = {
107 		.symbol = "context-switches",
108 		.alias  = "cs",
109 	},
110 	[PERF_COUNT_SW_CPU_MIGRATIONS] = {
111 		.symbol = "cpu-migrations",
112 		.alias  = "migrations",
113 	},
114 	[PERF_COUNT_SW_PAGE_FAULTS_MIN] = {
115 		.symbol = "minor-faults",
116 		.alias  = "",
117 	},
118 	[PERF_COUNT_SW_PAGE_FAULTS_MAJ] = {
119 		.symbol = "major-faults",
120 		.alias  = "",
121 	},
122 	[PERF_COUNT_SW_ALIGNMENT_FAULTS] = {
123 		.symbol = "alignment-faults",
124 		.alias  = "",
125 	},
126 	[PERF_COUNT_SW_EMULATION_FAULTS] = {
127 		.symbol = "emulation-faults",
128 		.alias  = "",
129 	},
130 	[PERF_COUNT_SW_DUMMY] = {
131 		.symbol = "dummy",
132 		.alias  = "",
133 	},
134 	[PERF_COUNT_SW_BPF_OUTPUT] = {
135 		.symbol = "bpf-output",
136 		.alias  = "",
137 	},
138 };
139 
140 #define __PERF_EVENT_FIELD(config, name) \
141 	((config & PERF_EVENT_##name##_MASK) >> PERF_EVENT_##name##_SHIFT)
142 
143 #define PERF_EVENT_RAW(config)		__PERF_EVENT_FIELD(config, RAW)
144 #define PERF_EVENT_CONFIG(config)	__PERF_EVENT_FIELD(config, CONFIG)
145 #define PERF_EVENT_TYPE(config)		__PERF_EVENT_FIELD(config, TYPE)
146 #define PERF_EVENT_ID(config)		__PERF_EVENT_FIELD(config, EVENT)
147 
148 #define for_each_subsystem(sys_dir, sys_dirent)			\
149 	while ((sys_dirent = readdir(sys_dir)) != NULL)		\
150 		if (sys_dirent->d_type == DT_DIR &&		\
151 		    (strcmp(sys_dirent->d_name, ".")) &&	\
152 		    (strcmp(sys_dirent->d_name, "..")))
153 
154 static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
155 {
156 	char evt_path[MAXPATHLEN];
157 	int fd;
158 
159 	snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", tracing_events_path,
160 			sys_dir->d_name, evt_dir->d_name);
161 	fd = open(evt_path, O_RDONLY);
162 	if (fd < 0)
163 		return -EINVAL;
164 	close(fd);
165 
166 	return 0;
167 }
168 
169 #define for_each_event(sys_dirent, evt_dir, evt_dirent)		\
170 	while ((evt_dirent = readdir(evt_dir)) != NULL)		\
171 		if (evt_dirent->d_type == DT_DIR &&		\
172 		    (strcmp(evt_dirent->d_name, ".")) &&	\
173 		    (strcmp(evt_dirent->d_name, "..")) &&	\
174 		    (!tp_event_has_id(sys_dirent, evt_dirent)))
175 
176 #define MAX_EVENT_LENGTH 512
177 
178 
179 struct tracepoint_path *tracepoint_id_to_path(u64 config)
180 {
181 	struct tracepoint_path *path = NULL;
182 	DIR *sys_dir, *evt_dir;
183 	struct dirent *sys_dirent, *evt_dirent;
184 	char id_buf[24];
185 	int fd;
186 	u64 id;
187 	char evt_path[MAXPATHLEN];
188 	char dir_path[MAXPATHLEN];
189 
190 	sys_dir = opendir(tracing_events_path);
191 	if (!sys_dir)
192 		return NULL;
193 
194 	for_each_subsystem(sys_dir, sys_dirent) {
195 
196 		snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
197 			 sys_dirent->d_name);
198 		evt_dir = opendir(dir_path);
199 		if (!evt_dir)
200 			continue;
201 
202 		for_each_event(sys_dirent, evt_dir, evt_dirent) {
203 
204 			snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
205 				 evt_dirent->d_name);
206 			fd = open(evt_path, O_RDONLY);
207 			if (fd < 0)
208 				continue;
209 			if (read(fd, id_buf, sizeof(id_buf)) < 0) {
210 				close(fd);
211 				continue;
212 			}
213 			close(fd);
214 			id = atoll(id_buf);
215 			if (id == config) {
216 				closedir(evt_dir);
217 				closedir(sys_dir);
218 				path = zalloc(sizeof(*path));
219 				if (!path)
220 					return NULL;
221 				path->system = malloc(MAX_EVENT_LENGTH);
222 				if (!path->system) {
223 					free(path);
224 					return NULL;
225 				}
226 				path->name = malloc(MAX_EVENT_LENGTH);
227 				if (!path->name) {
228 					zfree(&path->system);
229 					free(path);
230 					return NULL;
231 				}
232 				strncpy(path->system, sys_dirent->d_name,
233 					MAX_EVENT_LENGTH);
234 				strncpy(path->name, evt_dirent->d_name,
235 					MAX_EVENT_LENGTH);
236 				return path;
237 			}
238 		}
239 		closedir(evt_dir);
240 	}
241 
242 	closedir(sys_dir);
243 	return NULL;
244 }
245 
246 struct tracepoint_path *tracepoint_name_to_path(const char *name)
247 {
248 	struct tracepoint_path *path = zalloc(sizeof(*path));
249 	char *str = strchr(name, ':');
250 
251 	if (path == NULL || str == NULL) {
252 		free(path);
253 		return NULL;
254 	}
255 
256 	path->system = strndup(name, str - name);
257 	path->name = strdup(str+1);
258 
259 	if (path->system == NULL || path->name == NULL) {
260 		zfree(&path->system);
261 		zfree(&path->name);
262 		zfree(&path);
263 	}
264 
265 	return path;
266 }
267 
268 const char *event_type(int type)
269 {
270 	switch (type) {
271 	case PERF_TYPE_HARDWARE:
272 		return "hardware";
273 
274 	case PERF_TYPE_SOFTWARE:
275 		return "software";
276 
277 	case PERF_TYPE_TRACEPOINT:
278 		return "tracepoint";
279 
280 	case PERF_TYPE_HW_CACHE:
281 		return "hardware-cache";
282 
283 	default:
284 		break;
285 	}
286 
287 	return "unknown";
288 }
289 
290 static int parse_events__is_name_term(struct parse_events_term *term)
291 {
292 	return term->type_term == PARSE_EVENTS__TERM_TYPE_NAME;
293 }
294 
295 static char *get_config_name(struct list_head *head_terms)
296 {
297 	struct parse_events_term *term;
298 
299 	if (!head_terms)
300 		return NULL;
301 
302 	list_for_each_entry(term, head_terms, list)
303 		if (parse_events__is_name_term(term))
304 			return term->val.str;
305 
306 	return NULL;
307 }
308 
309 static struct perf_evsel *
310 __add_event(struct list_head *list, int *idx,
311 	    struct perf_event_attr *attr,
312 	    char *name, struct cpu_map *cpus,
313 	    struct list_head *config_terms)
314 {
315 	struct perf_evsel *evsel;
316 
317 	event_attr_init(attr);
318 
319 	evsel = perf_evsel__new_idx(attr, *idx);
320 	if (!evsel)
321 		return NULL;
322 
323 	(*idx)++;
324 	evsel->cpus        = cpu_map__get(cpus);
325 	evsel->own_cpus    = cpu_map__get(cpus);
326 	evsel->system_wide = !!cpus;
327 
328 	if (name)
329 		evsel->name = strdup(name);
330 
331 	if (config_terms)
332 		list_splice(config_terms, &evsel->config_terms);
333 
334 	list_add_tail(&evsel->node, list);
335 	return evsel;
336 }
337 
338 static int add_event(struct list_head *list, int *idx,
339 		     struct perf_event_attr *attr, char *name,
340 		     struct list_head *config_terms)
341 {
342 	return __add_event(list, idx, attr, name, NULL, config_terms) ? 0 : -ENOMEM;
343 }
344 
345 static int parse_aliases(char *str, const char *names[][PERF_EVSEL__MAX_ALIASES], int size)
346 {
347 	int i, j;
348 	int n, longest = -1;
349 
350 	for (i = 0; i < size; i++) {
351 		for (j = 0; j < PERF_EVSEL__MAX_ALIASES && names[i][j]; j++) {
352 			n = strlen(names[i][j]);
353 			if (n > longest && !strncasecmp(str, names[i][j], n))
354 				longest = n;
355 		}
356 		if (longest > 0)
357 			return i;
358 	}
359 
360 	return -1;
361 }
362 
363 typedef int config_term_func_t(struct perf_event_attr *attr,
364 			       struct parse_events_term *term,
365 			       struct parse_events_error *err);
366 static int config_term_common(struct perf_event_attr *attr,
367 			      struct parse_events_term *term,
368 			      struct parse_events_error *err);
369 static int config_attr(struct perf_event_attr *attr,
370 		       struct list_head *head,
371 		       struct parse_events_error *err,
372 		       config_term_func_t config_term);
373 
374 int parse_events_add_cache(struct list_head *list, int *idx,
375 			   char *type, char *op_result1, char *op_result2,
376 			   struct parse_events_error *err,
377 			   struct list_head *head_config)
378 {
379 	struct perf_event_attr attr;
380 	LIST_HEAD(config_terms);
381 	char name[MAX_NAME_LEN], *config_name;
382 	int cache_type = -1, cache_op = -1, cache_result = -1;
383 	char *op_result[2] = { op_result1, op_result2 };
384 	int i, n;
385 
386 	/*
387 	 * No fallback - if we cannot get a clear cache type
388 	 * then bail out:
389 	 */
390 	cache_type = parse_aliases(type, perf_evsel__hw_cache,
391 				   PERF_COUNT_HW_CACHE_MAX);
392 	if (cache_type == -1)
393 		return -EINVAL;
394 
395 	config_name = get_config_name(head_config);
396 	n = snprintf(name, MAX_NAME_LEN, "%s", type);
397 
398 	for (i = 0; (i < 2) && (op_result[i]); i++) {
399 		char *str = op_result[i];
400 
401 		n += snprintf(name + n, MAX_NAME_LEN - n, "-%s", str);
402 
403 		if (cache_op == -1) {
404 			cache_op = parse_aliases(str, perf_evsel__hw_cache_op,
405 						 PERF_COUNT_HW_CACHE_OP_MAX);
406 			if (cache_op >= 0) {
407 				if (!perf_evsel__is_cache_op_valid(cache_type, cache_op))
408 					return -EINVAL;
409 				continue;
410 			}
411 		}
412 
413 		if (cache_result == -1) {
414 			cache_result = parse_aliases(str, perf_evsel__hw_cache_result,
415 						     PERF_COUNT_HW_CACHE_RESULT_MAX);
416 			if (cache_result >= 0)
417 				continue;
418 		}
419 	}
420 
421 	/*
422 	 * Fall back to reads:
423 	 */
424 	if (cache_op == -1)
425 		cache_op = PERF_COUNT_HW_CACHE_OP_READ;
426 
427 	/*
428 	 * Fall back to accesses:
429 	 */
430 	if (cache_result == -1)
431 		cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;
432 
433 	memset(&attr, 0, sizeof(attr));
434 	attr.config = cache_type | (cache_op << 8) | (cache_result << 16);
435 	attr.type = PERF_TYPE_HW_CACHE;
436 
437 	if (head_config) {
438 		if (config_attr(&attr, head_config, err,
439 				config_term_common))
440 			return -EINVAL;
441 
442 		if (get_config_terms(head_config, &config_terms))
443 			return -ENOMEM;
444 	}
445 	return add_event(list, idx, &attr, config_name ? : name, &config_terms);
446 }
447 
448 static void tracepoint_error(struct parse_events_error *e, int err,
449 			     const char *sys, const char *name)
450 {
451 	char help[BUFSIZ];
452 
453 	if (!e)
454 		return;
455 
456 	/*
457 	 * We get error directly from syscall errno ( > 0),
458 	 * or from encoded pointer's error ( < 0).
459 	 */
460 	err = abs(err);
461 
462 	switch (err) {
463 	case EACCES:
464 		e->str = strdup("can't access trace events");
465 		break;
466 	case ENOENT:
467 		e->str = strdup("unknown tracepoint");
468 		break;
469 	default:
470 		e->str = strdup("failed to add tracepoint");
471 		break;
472 	}
473 
474 	tracing_path__strerror_open_tp(err, help, sizeof(help), sys, name);
475 	e->help = strdup(help);
476 }
477 
478 static int add_tracepoint(struct list_head *list, int *idx,
479 			  const char *sys_name, const char *evt_name,
480 			  struct parse_events_error *err,
481 			  struct list_head *head_config)
482 {
483 	struct perf_evsel *evsel;
484 
485 	evsel = perf_evsel__newtp_idx(sys_name, evt_name, (*idx)++);
486 	if (IS_ERR(evsel)) {
487 		tracepoint_error(err, PTR_ERR(evsel), sys_name, evt_name);
488 		return PTR_ERR(evsel);
489 	}
490 
491 	if (head_config) {
492 		LIST_HEAD(config_terms);
493 
494 		if (get_config_terms(head_config, &config_terms))
495 			return -ENOMEM;
496 		list_splice(&config_terms, &evsel->config_terms);
497 	}
498 
499 	list_add_tail(&evsel->node, list);
500 	return 0;
501 }
502 
503 static int add_tracepoint_multi_event(struct list_head *list, int *idx,
504 				      const char *sys_name, const char *evt_name,
505 				      struct parse_events_error *err,
506 				      struct list_head *head_config)
507 {
508 	char evt_path[MAXPATHLEN];
509 	struct dirent *evt_ent;
510 	DIR *evt_dir;
511 	int ret = 0, found = 0;
512 
513 	snprintf(evt_path, MAXPATHLEN, "%s/%s", tracing_events_path, sys_name);
514 	evt_dir = opendir(evt_path);
515 	if (!evt_dir) {
516 		tracepoint_error(err, errno, sys_name, evt_name);
517 		return -1;
518 	}
519 
520 	while (!ret && (evt_ent = readdir(evt_dir))) {
521 		if (!strcmp(evt_ent->d_name, ".")
522 		    || !strcmp(evt_ent->d_name, "..")
523 		    || !strcmp(evt_ent->d_name, "enable")
524 		    || !strcmp(evt_ent->d_name, "filter"))
525 			continue;
526 
527 		if (!strglobmatch(evt_ent->d_name, evt_name))
528 			continue;
529 
530 		found++;
531 
532 		ret = add_tracepoint(list, idx, sys_name, evt_ent->d_name,
533 				     err, head_config);
534 	}
535 
536 	if (!found) {
537 		tracepoint_error(err, ENOENT, sys_name, evt_name);
538 		ret = -1;
539 	}
540 
541 	closedir(evt_dir);
542 	return ret;
543 }
544 
545 static int add_tracepoint_event(struct list_head *list, int *idx,
546 				const char *sys_name, const char *evt_name,
547 				struct parse_events_error *err,
548 				struct list_head *head_config)
549 {
550 	return strpbrk(evt_name, "*?") ?
551 	       add_tracepoint_multi_event(list, idx, sys_name, evt_name,
552 					  err, head_config) :
553 	       add_tracepoint(list, idx, sys_name, evt_name,
554 			      err, head_config);
555 }
556 
557 static int add_tracepoint_multi_sys(struct list_head *list, int *idx,
558 				    const char *sys_name, const char *evt_name,
559 				    struct parse_events_error *err,
560 				    struct list_head *head_config)
561 {
562 	struct dirent *events_ent;
563 	DIR *events_dir;
564 	int ret = 0;
565 
566 	events_dir = opendir(tracing_events_path);
567 	if (!events_dir) {
568 		tracepoint_error(err, errno, sys_name, evt_name);
569 		return -1;
570 	}
571 
572 	while (!ret && (events_ent = readdir(events_dir))) {
573 		if (!strcmp(events_ent->d_name, ".")
574 		    || !strcmp(events_ent->d_name, "..")
575 		    || !strcmp(events_ent->d_name, "enable")
576 		    || !strcmp(events_ent->d_name, "header_event")
577 		    || !strcmp(events_ent->d_name, "header_page"))
578 			continue;
579 
580 		if (!strglobmatch(events_ent->d_name, sys_name))
581 			continue;
582 
583 		ret = add_tracepoint_event(list, idx, events_ent->d_name,
584 					   evt_name, err, head_config);
585 	}
586 
587 	closedir(events_dir);
588 	return ret;
589 }
590 
591 struct __add_bpf_event_param {
592 	struct parse_events_evlist *data;
593 	struct list_head *list;
594 	struct list_head *head_config;
595 };
596 
597 static int add_bpf_event(const char *group, const char *event, int fd,
598 			 void *_param)
599 {
600 	LIST_HEAD(new_evsels);
601 	struct __add_bpf_event_param *param = _param;
602 	struct parse_events_evlist *evlist = param->data;
603 	struct list_head *list = param->list;
604 	struct perf_evsel *pos;
605 	int err;
606 
607 	pr_debug("add bpf event %s:%s and attach bpf program %d\n",
608 		 group, event, fd);
609 
610 	err = parse_events_add_tracepoint(&new_evsels, &evlist->idx, group,
611 					  event, evlist->error,
612 					  param->head_config);
613 	if (err) {
614 		struct perf_evsel *evsel, *tmp;
615 
616 		pr_debug("Failed to add BPF event %s:%s\n",
617 			 group, event);
618 		list_for_each_entry_safe(evsel, tmp, &new_evsels, node) {
619 			list_del(&evsel->node);
620 			perf_evsel__delete(evsel);
621 		}
622 		return err;
623 	}
624 	pr_debug("adding %s:%s\n", group, event);
625 
626 	list_for_each_entry(pos, &new_evsels, node) {
627 		pr_debug("adding %s:%s to %p\n",
628 			 group, event, pos);
629 		pos->bpf_fd = fd;
630 	}
631 	list_splice(&new_evsels, list);
632 	return 0;
633 }
634 
635 int parse_events_load_bpf_obj(struct parse_events_evlist *data,
636 			      struct list_head *list,
637 			      struct bpf_object *obj,
638 			      struct list_head *head_config)
639 {
640 	int err;
641 	char errbuf[BUFSIZ];
642 	struct __add_bpf_event_param param = {data, list, head_config};
643 	static bool registered_unprobe_atexit = false;
644 
645 	if (IS_ERR(obj) || !obj) {
646 		snprintf(errbuf, sizeof(errbuf),
647 			 "Internal error: load bpf obj with NULL");
648 		err = -EINVAL;
649 		goto errout;
650 	}
651 
652 	/*
653 	 * Register atexit handler before calling bpf__probe() so
654 	 * bpf__probe() don't need to unprobe probe points its already
655 	 * created when failure.
656 	 */
657 	if (!registered_unprobe_atexit) {
658 		atexit(bpf__clear);
659 		registered_unprobe_atexit = true;
660 	}
661 
662 	err = bpf__probe(obj);
663 	if (err) {
664 		bpf__strerror_probe(obj, err, errbuf, sizeof(errbuf));
665 		goto errout;
666 	}
667 
668 	err = bpf__load(obj);
669 	if (err) {
670 		bpf__strerror_load(obj, err, errbuf, sizeof(errbuf));
671 		goto errout;
672 	}
673 
674 	err = bpf__foreach_event(obj, add_bpf_event, &param);
675 	if (err) {
676 		snprintf(errbuf, sizeof(errbuf),
677 			 "Attach events in BPF object failed");
678 		goto errout;
679 	}
680 
681 	return 0;
682 errout:
683 	data->error->help = strdup("(add -v to see detail)");
684 	data->error->str = strdup(errbuf);
685 	return err;
686 }
687 
688 static int
689 parse_events_config_bpf(struct parse_events_evlist *data,
690 			struct bpf_object *obj,
691 			struct list_head *head_config)
692 {
693 	struct parse_events_term *term;
694 	int error_pos;
695 
696 	if (!head_config || list_empty(head_config))
697 		return 0;
698 
699 	list_for_each_entry(term, head_config, list) {
700 		char errbuf[BUFSIZ];
701 		int err;
702 
703 		if (term->type_term != PARSE_EVENTS__TERM_TYPE_USER) {
704 			snprintf(errbuf, sizeof(errbuf),
705 				 "Invalid config term for BPF object");
706 			errbuf[BUFSIZ - 1] = '\0';
707 
708 			data->error->idx = term->err_term;
709 			data->error->str = strdup(errbuf);
710 			return -EINVAL;
711 		}
712 
713 		err = bpf__config_obj(obj, term, data->evlist, &error_pos);
714 		if (err) {
715 			bpf__strerror_config_obj(obj, term, data->evlist,
716 						 &error_pos, err, errbuf,
717 						 sizeof(errbuf));
718 			data->error->help = strdup(
719 "Hint:\tValid config terms:\n"
720 "     \tmap:[<arraymap>].value<indices>=[value]\n"
721 "     \tmap:[<eventmap>].event<indices>=[event]\n"
722 "\n"
723 "     \twhere <indices> is something like [0,3...5] or [all]\n"
724 "     \t(add -v to see detail)");
725 			data->error->str = strdup(errbuf);
726 			if (err == -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE)
727 				data->error->idx = term->err_val;
728 			else
729 				data->error->idx = term->err_term + error_pos;
730 			return err;
731 		}
732 	}
733 	return 0;
734 }
735 
736 /*
737  * Split config terms:
738  * perf record -e bpf.c/call-graph=fp,map:array.value[0]=1/ ...
739  *  'call-graph=fp' is 'evt config', should be applied to each
740  *  events in bpf.c.
741  * 'map:array.value[0]=1' is 'obj config', should be processed
742  * with parse_events_config_bpf.
743  *
744  * Move object config terms from the first list to obj_head_config.
745  */
746 static void
747 split_bpf_config_terms(struct list_head *evt_head_config,
748 		       struct list_head *obj_head_config)
749 {
750 	struct parse_events_term *term, *temp;
751 
752 	/*
753 	 * Currectly, all possible user config term
754 	 * belong to bpf object. parse_events__is_hardcoded_term()
755 	 * happends to be a good flag.
756 	 *
757 	 * See parse_events_config_bpf() and
758 	 * config_term_tracepoint().
759 	 */
760 	list_for_each_entry_safe(term, temp, evt_head_config, list)
761 		if (!parse_events__is_hardcoded_term(term))
762 			list_move_tail(&term->list, obj_head_config);
763 }
764 
765 int parse_events_load_bpf(struct parse_events_evlist *data,
766 			  struct list_head *list,
767 			  char *bpf_file_name,
768 			  bool source,
769 			  struct list_head *head_config)
770 {
771 	int err;
772 	struct bpf_object *obj;
773 	LIST_HEAD(obj_head_config);
774 
775 	if (head_config)
776 		split_bpf_config_terms(head_config, &obj_head_config);
777 
778 	obj = bpf__prepare_load(bpf_file_name, source);
779 	if (IS_ERR(obj)) {
780 		char errbuf[BUFSIZ];
781 
782 		err = PTR_ERR(obj);
783 
784 		if (err == -ENOTSUP)
785 			snprintf(errbuf, sizeof(errbuf),
786 				 "BPF support is not compiled");
787 		else
788 			bpf__strerror_prepare_load(bpf_file_name,
789 						   source,
790 						   -err, errbuf,
791 						   sizeof(errbuf));
792 
793 		data->error->help = strdup("(add -v to see detail)");
794 		data->error->str = strdup(errbuf);
795 		return err;
796 	}
797 
798 	err = parse_events_load_bpf_obj(data, list, obj, head_config);
799 	if (err)
800 		return err;
801 	err = parse_events_config_bpf(data, obj, &obj_head_config);
802 
803 	/*
804 	 * Caller doesn't know anything about obj_head_config,
805 	 * so combine them together again before returnning.
806 	 */
807 	if (head_config)
808 		list_splice_tail(&obj_head_config, head_config);
809 	return err;
810 }
811 
812 static int
813 parse_breakpoint_type(const char *type, struct perf_event_attr *attr)
814 {
815 	int i;
816 
817 	for (i = 0; i < 3; i++) {
818 		if (!type || !type[i])
819 			break;
820 
821 #define CHECK_SET_TYPE(bit)		\
822 do {					\
823 	if (attr->bp_type & bit)	\
824 		return -EINVAL;		\
825 	else				\
826 		attr->bp_type |= bit;	\
827 } while (0)
828 
829 		switch (type[i]) {
830 		case 'r':
831 			CHECK_SET_TYPE(HW_BREAKPOINT_R);
832 			break;
833 		case 'w':
834 			CHECK_SET_TYPE(HW_BREAKPOINT_W);
835 			break;
836 		case 'x':
837 			CHECK_SET_TYPE(HW_BREAKPOINT_X);
838 			break;
839 		default:
840 			return -EINVAL;
841 		}
842 	}
843 
844 #undef CHECK_SET_TYPE
845 
846 	if (!attr->bp_type) /* Default */
847 		attr->bp_type = HW_BREAKPOINT_R | HW_BREAKPOINT_W;
848 
849 	return 0;
850 }
851 
852 int parse_events_add_breakpoint(struct list_head *list, int *idx,
853 				void *ptr, char *type, u64 len)
854 {
855 	struct perf_event_attr attr;
856 
857 	memset(&attr, 0, sizeof(attr));
858 	attr.bp_addr = (unsigned long) ptr;
859 
860 	if (parse_breakpoint_type(type, &attr))
861 		return -EINVAL;
862 
863 	/* Provide some defaults if len is not specified */
864 	if (!len) {
865 		if (attr.bp_type == HW_BREAKPOINT_X)
866 			len = sizeof(long);
867 		else
868 			len = HW_BREAKPOINT_LEN_4;
869 	}
870 
871 	attr.bp_len = len;
872 
873 	attr.type = PERF_TYPE_BREAKPOINT;
874 	attr.sample_period = 1;
875 
876 	return add_event(list, idx, &attr, NULL, NULL);
877 }
878 
879 static int check_type_val(struct parse_events_term *term,
880 			  struct parse_events_error *err,
881 			  int type)
882 {
883 	if (type == term->type_val)
884 		return 0;
885 
886 	if (err) {
887 		err->idx = term->err_val;
888 		if (type == PARSE_EVENTS__TERM_TYPE_NUM)
889 			err->str = strdup("expected numeric value");
890 		else
891 			err->str = strdup("expected string value");
892 	}
893 	return -EINVAL;
894 }
895 
896 /*
897  * Update according to parse-events.l
898  */
899 static const char *config_term_names[__PARSE_EVENTS__TERM_TYPE_NR] = {
900 	[PARSE_EVENTS__TERM_TYPE_USER]			= "<sysfs term>",
901 	[PARSE_EVENTS__TERM_TYPE_CONFIG]		= "config",
902 	[PARSE_EVENTS__TERM_TYPE_CONFIG1]		= "config1",
903 	[PARSE_EVENTS__TERM_TYPE_CONFIG2]		= "config2",
904 	[PARSE_EVENTS__TERM_TYPE_NAME]			= "name",
905 	[PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD]		= "period",
906 	[PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ]		= "freq",
907 	[PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE]	= "branch_type",
908 	[PARSE_EVENTS__TERM_TYPE_TIME]			= "time",
909 	[PARSE_EVENTS__TERM_TYPE_CALLGRAPH]		= "call-graph",
910 	[PARSE_EVENTS__TERM_TYPE_STACKSIZE]		= "stack-size",
911 	[PARSE_EVENTS__TERM_TYPE_NOINHERIT]		= "no-inherit",
912 	[PARSE_EVENTS__TERM_TYPE_INHERIT]		= "inherit",
913 	[PARSE_EVENTS__TERM_TYPE_MAX_STACK]		= "max-stack",
914 	[PARSE_EVENTS__TERM_TYPE_OVERWRITE]		= "overwrite",
915 	[PARSE_EVENTS__TERM_TYPE_NOOVERWRITE]		= "no-overwrite",
916 	[PARSE_EVENTS__TERM_TYPE_DRV_CFG]		= "driver-config",
917 };
918 
919 static bool config_term_shrinked;
920 
921 static bool
922 config_term_avail(int term_type, struct parse_events_error *err)
923 {
924 	if (term_type < 0 || term_type >= __PARSE_EVENTS__TERM_TYPE_NR) {
925 		err->str = strdup("Invalid term_type");
926 		return false;
927 	}
928 	if (!config_term_shrinked)
929 		return true;
930 
931 	switch (term_type) {
932 	case PARSE_EVENTS__TERM_TYPE_CONFIG:
933 	case PARSE_EVENTS__TERM_TYPE_CONFIG1:
934 	case PARSE_EVENTS__TERM_TYPE_CONFIG2:
935 	case PARSE_EVENTS__TERM_TYPE_NAME:
936 	case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
937 		return true;
938 	default:
939 		if (!err)
940 			return false;
941 
942 		/* term_type is validated so indexing is safe */
943 		if (asprintf(&err->str, "'%s' is not usable in 'perf stat'",
944 			     config_term_names[term_type]) < 0)
945 			err->str = NULL;
946 		return false;
947 	}
948 }
949 
950 void parse_events__shrink_config_terms(void)
951 {
952 	config_term_shrinked = true;
953 }
954 
955 static int config_term_common(struct perf_event_attr *attr,
956 			      struct parse_events_term *term,
957 			      struct parse_events_error *err)
958 {
959 #define CHECK_TYPE_VAL(type)						   \
960 do {									   \
961 	if (check_type_val(term, err, PARSE_EVENTS__TERM_TYPE_ ## type)) \
962 		return -EINVAL;						   \
963 } while (0)
964 
965 	switch (term->type_term) {
966 	case PARSE_EVENTS__TERM_TYPE_CONFIG:
967 		CHECK_TYPE_VAL(NUM);
968 		attr->config = term->val.num;
969 		break;
970 	case PARSE_EVENTS__TERM_TYPE_CONFIG1:
971 		CHECK_TYPE_VAL(NUM);
972 		attr->config1 = term->val.num;
973 		break;
974 	case PARSE_EVENTS__TERM_TYPE_CONFIG2:
975 		CHECK_TYPE_VAL(NUM);
976 		attr->config2 = term->val.num;
977 		break;
978 	case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
979 		CHECK_TYPE_VAL(NUM);
980 		break;
981 	case PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ:
982 		CHECK_TYPE_VAL(NUM);
983 		break;
984 	case PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE:
985 		CHECK_TYPE_VAL(STR);
986 		if (strcmp(term->val.str, "no") &&
987 		    parse_branch_str(term->val.str, &attr->branch_sample_type)) {
988 			err->str = strdup("invalid branch sample type");
989 			err->idx = term->err_val;
990 			return -EINVAL;
991 		}
992 		break;
993 	case PARSE_EVENTS__TERM_TYPE_TIME:
994 		CHECK_TYPE_VAL(NUM);
995 		if (term->val.num > 1) {
996 			err->str = strdup("expected 0 or 1");
997 			err->idx = term->err_val;
998 			return -EINVAL;
999 		}
1000 		break;
1001 	case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
1002 		CHECK_TYPE_VAL(STR);
1003 		break;
1004 	case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
1005 		CHECK_TYPE_VAL(NUM);
1006 		break;
1007 	case PARSE_EVENTS__TERM_TYPE_INHERIT:
1008 		CHECK_TYPE_VAL(NUM);
1009 		break;
1010 	case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
1011 		CHECK_TYPE_VAL(NUM);
1012 		break;
1013 	case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
1014 		CHECK_TYPE_VAL(NUM);
1015 		break;
1016 	case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
1017 		CHECK_TYPE_VAL(NUM);
1018 		break;
1019 	case PARSE_EVENTS__TERM_TYPE_NAME:
1020 		CHECK_TYPE_VAL(STR);
1021 		break;
1022 	case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
1023 		CHECK_TYPE_VAL(NUM);
1024 		break;
1025 	default:
1026 		err->str = strdup("unknown term");
1027 		err->idx = term->err_term;
1028 		err->help = parse_events_formats_error_string(NULL);
1029 		return -EINVAL;
1030 	}
1031 
1032 	/*
1033 	 * Check term availbility after basic checking so
1034 	 * PARSE_EVENTS__TERM_TYPE_USER can be found and filtered.
1035 	 *
1036 	 * If check availbility at the entry of this function,
1037 	 * user will see "'<sysfs term>' is not usable in 'perf stat'"
1038 	 * if an invalid config term is provided for legacy events
1039 	 * (for example, instructions/badterm/...), which is confusing.
1040 	 */
1041 	if (!config_term_avail(term->type_term, err))
1042 		return -EINVAL;
1043 	return 0;
1044 #undef CHECK_TYPE_VAL
1045 }
1046 
1047 static int config_term_pmu(struct perf_event_attr *attr,
1048 			   struct parse_events_term *term,
1049 			   struct parse_events_error *err)
1050 {
1051 	if (term->type_term == PARSE_EVENTS__TERM_TYPE_USER ||
1052 	    term->type_term == PARSE_EVENTS__TERM_TYPE_DRV_CFG)
1053 		/*
1054 		 * Always succeed for sysfs terms, as we dont know
1055 		 * at this point what type they need to have.
1056 		 */
1057 		return 0;
1058 	else
1059 		return config_term_common(attr, term, err);
1060 }
1061 
1062 static int config_term_tracepoint(struct perf_event_attr *attr,
1063 				  struct parse_events_term *term,
1064 				  struct parse_events_error *err)
1065 {
1066 	switch (term->type_term) {
1067 	case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
1068 	case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
1069 	case PARSE_EVENTS__TERM_TYPE_INHERIT:
1070 	case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
1071 	case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
1072 	case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
1073 	case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
1074 		return config_term_common(attr, term, err);
1075 	default:
1076 		if (err) {
1077 			err->idx = term->err_term;
1078 			err->str = strdup("unknown term");
1079 			err->help = strdup("valid terms: call-graph,stack-size\n");
1080 		}
1081 		return -EINVAL;
1082 	}
1083 
1084 	return 0;
1085 }
1086 
1087 static int config_attr(struct perf_event_attr *attr,
1088 		       struct list_head *head,
1089 		       struct parse_events_error *err,
1090 		       config_term_func_t config_term)
1091 {
1092 	struct parse_events_term *term;
1093 
1094 	list_for_each_entry(term, head, list)
1095 		if (config_term(attr, term, err))
1096 			return -EINVAL;
1097 
1098 	return 0;
1099 }
1100 
1101 static int get_config_terms(struct list_head *head_config,
1102 			    struct list_head *head_terms __maybe_unused)
1103 {
1104 #define ADD_CONFIG_TERM(__type, __name, __val)			\
1105 do {								\
1106 	struct perf_evsel_config_term *__t;			\
1107 								\
1108 	__t = zalloc(sizeof(*__t));				\
1109 	if (!__t)						\
1110 		return -ENOMEM;					\
1111 								\
1112 	INIT_LIST_HEAD(&__t->list);				\
1113 	__t->type       = PERF_EVSEL__CONFIG_TERM_ ## __type;	\
1114 	__t->val.__name = __val;				\
1115 	list_add_tail(&__t->list, head_terms);			\
1116 } while (0)
1117 
1118 	struct parse_events_term *term;
1119 
1120 	list_for_each_entry(term, head_config, list) {
1121 		switch (term->type_term) {
1122 		case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
1123 			ADD_CONFIG_TERM(PERIOD, period, term->val.num);
1124 			break;
1125 		case PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ:
1126 			ADD_CONFIG_TERM(FREQ, freq, term->val.num);
1127 			break;
1128 		case PARSE_EVENTS__TERM_TYPE_TIME:
1129 			ADD_CONFIG_TERM(TIME, time, term->val.num);
1130 			break;
1131 		case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
1132 			ADD_CONFIG_TERM(CALLGRAPH, callgraph, term->val.str);
1133 			break;
1134 		case PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE:
1135 			ADD_CONFIG_TERM(BRANCH, branch, term->val.str);
1136 			break;
1137 		case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
1138 			ADD_CONFIG_TERM(STACK_USER, stack_user, term->val.num);
1139 			break;
1140 		case PARSE_EVENTS__TERM_TYPE_INHERIT:
1141 			ADD_CONFIG_TERM(INHERIT, inherit, term->val.num ? 1 : 0);
1142 			break;
1143 		case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
1144 			ADD_CONFIG_TERM(INHERIT, inherit, term->val.num ? 0 : 1);
1145 			break;
1146 		case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
1147 			ADD_CONFIG_TERM(MAX_STACK, max_stack, term->val.num);
1148 			break;
1149 		case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
1150 			ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 1 : 0);
1151 			break;
1152 		case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
1153 			ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 0 : 1);
1154 			break;
1155 		case PARSE_EVENTS__TERM_TYPE_DRV_CFG:
1156 			ADD_CONFIG_TERM(DRV_CFG, drv_cfg, term->val.str);
1157 			break;
1158 		default:
1159 			break;
1160 		}
1161 	}
1162 #undef ADD_EVSEL_CONFIG
1163 	return 0;
1164 }
1165 
1166 int parse_events_add_tracepoint(struct list_head *list, int *idx,
1167 				const char *sys, const char *event,
1168 				struct parse_events_error *err,
1169 				struct list_head *head_config)
1170 {
1171 	if (head_config) {
1172 		struct perf_event_attr attr;
1173 
1174 		if (config_attr(&attr, head_config, err,
1175 				config_term_tracepoint))
1176 			return -EINVAL;
1177 	}
1178 
1179 	if (strpbrk(sys, "*?"))
1180 		return add_tracepoint_multi_sys(list, idx, sys, event,
1181 						err, head_config);
1182 	else
1183 		return add_tracepoint_event(list, idx, sys, event,
1184 					    err, head_config);
1185 }
1186 
1187 int parse_events_add_numeric(struct parse_events_evlist *data,
1188 			     struct list_head *list,
1189 			     u32 type, u64 config,
1190 			     struct list_head *head_config)
1191 {
1192 	struct perf_event_attr attr;
1193 	LIST_HEAD(config_terms);
1194 
1195 	memset(&attr, 0, sizeof(attr));
1196 	attr.type = type;
1197 	attr.config = config;
1198 
1199 	if (head_config) {
1200 		if (config_attr(&attr, head_config, data->error,
1201 				config_term_common))
1202 			return -EINVAL;
1203 
1204 		if (get_config_terms(head_config, &config_terms))
1205 			return -ENOMEM;
1206 	}
1207 
1208 	return add_event(list, &data->idx, &attr,
1209 			 get_config_name(head_config), &config_terms);
1210 }
1211 
1212 int parse_events_add_pmu(struct parse_events_evlist *data,
1213 			 struct list_head *list, char *name,
1214 			 struct list_head *head_config)
1215 {
1216 	struct perf_event_attr attr;
1217 	struct perf_pmu_info info;
1218 	struct perf_pmu *pmu;
1219 	struct perf_evsel *evsel;
1220 	LIST_HEAD(config_terms);
1221 
1222 	pmu = perf_pmu__find(name);
1223 	if (!pmu)
1224 		return -EINVAL;
1225 
1226 	if (pmu->default_config) {
1227 		memcpy(&attr, pmu->default_config,
1228 		       sizeof(struct perf_event_attr));
1229 	} else {
1230 		memset(&attr, 0, sizeof(attr));
1231 	}
1232 
1233 	if (!head_config) {
1234 		attr.type = pmu->type;
1235 		evsel = __add_event(list, &data->idx, &attr, NULL, pmu->cpus, NULL);
1236 		return evsel ? 0 : -ENOMEM;
1237 	}
1238 
1239 	if (perf_pmu__check_alias(pmu, head_config, &info))
1240 		return -EINVAL;
1241 
1242 	/*
1243 	 * Configure hardcoded terms first, no need to check
1244 	 * return value when called with fail == 0 ;)
1245 	 */
1246 	if (config_attr(&attr, head_config, data->error, config_term_pmu))
1247 		return -EINVAL;
1248 
1249 	if (get_config_terms(head_config, &config_terms))
1250 		return -ENOMEM;
1251 
1252 	if (perf_pmu__config(pmu, &attr, head_config, data->error))
1253 		return -EINVAL;
1254 
1255 	evsel = __add_event(list, &data->idx, &attr,
1256 			    get_config_name(head_config), pmu->cpus,
1257 			    &config_terms);
1258 	if (evsel) {
1259 		evsel->unit = info.unit;
1260 		evsel->scale = info.scale;
1261 		evsel->per_pkg = info.per_pkg;
1262 		evsel->snapshot = info.snapshot;
1263 		evsel->metric_expr = info.metric_expr;
1264 		evsel->metric_name = info.metric_name;
1265 	}
1266 
1267 	return evsel ? 0 : -ENOMEM;
1268 }
1269 
1270 int parse_events_multi_pmu_add(struct parse_events_evlist *data,
1271 			       char *str, struct list_head **listp)
1272 {
1273 	struct list_head *head;
1274 	struct parse_events_term *term;
1275 	struct list_head *list;
1276 	struct perf_pmu *pmu = NULL;
1277 	int ok = 0;
1278 
1279 	*listp = NULL;
1280 	/* Add it for all PMUs that support the alias */
1281 	list = malloc(sizeof(struct list_head));
1282 	if (!list)
1283 		return -1;
1284 	INIT_LIST_HEAD(list);
1285 	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1286 		struct perf_pmu_alias *alias;
1287 
1288 		list_for_each_entry(alias, &pmu->aliases, list) {
1289 			if (!strcasecmp(alias->name, str)) {
1290 				head = malloc(sizeof(struct list_head));
1291 				if (!head)
1292 					return -1;
1293 				INIT_LIST_HEAD(head);
1294 				if (parse_events_term__num(&term, PARSE_EVENTS__TERM_TYPE_USER,
1295 							   str, 1, false, &str, NULL) < 0)
1296 					return -1;
1297 				list_add_tail(&term->list, head);
1298 
1299 				if (!parse_events_add_pmu(data, list,
1300 						  pmu->name, head)) {
1301 					pr_debug("%s -> %s/%s/\n", str,
1302 						 pmu->name, alias->str);
1303 					ok++;
1304 				}
1305 
1306 				parse_events_terms__delete(head);
1307 			}
1308 		}
1309 	}
1310 	if (!ok)
1311 		return -1;
1312 	*listp = list;
1313 	return 0;
1314 }
1315 
1316 int parse_events__modifier_group(struct list_head *list,
1317 				 char *event_mod)
1318 {
1319 	return parse_events__modifier_event(list, event_mod, true);
1320 }
1321 
1322 void parse_events__set_leader(char *name, struct list_head *list)
1323 {
1324 	struct perf_evsel *leader;
1325 
1326 	if (list_empty(list)) {
1327 		WARN_ONCE(true, "WARNING: failed to set leader: empty list");
1328 		return;
1329 	}
1330 
1331 	__perf_evlist__set_leader(list);
1332 	leader = list_entry(list->next, struct perf_evsel, node);
1333 	leader->group_name = name ? strdup(name) : NULL;
1334 }
1335 
1336 /* list_event is assumed to point to malloc'ed memory */
1337 void parse_events_update_lists(struct list_head *list_event,
1338 			       struct list_head *list_all)
1339 {
1340 	/*
1341 	 * Called for single event definition. Update the
1342 	 * 'all event' list, and reinit the 'single event'
1343 	 * list, for next event definition.
1344 	 */
1345 	list_splice_tail(list_event, list_all);
1346 	free(list_event);
1347 }
1348 
1349 struct event_modifier {
1350 	int eu;
1351 	int ek;
1352 	int eh;
1353 	int eH;
1354 	int eG;
1355 	int eI;
1356 	int precise;
1357 	int precise_max;
1358 	int exclude_GH;
1359 	int sample_read;
1360 	int pinned;
1361 };
1362 
1363 static int get_event_modifier(struct event_modifier *mod, char *str,
1364 			       struct perf_evsel *evsel)
1365 {
1366 	int eu = evsel ? evsel->attr.exclude_user : 0;
1367 	int ek = evsel ? evsel->attr.exclude_kernel : 0;
1368 	int eh = evsel ? evsel->attr.exclude_hv : 0;
1369 	int eH = evsel ? evsel->attr.exclude_host : 0;
1370 	int eG = evsel ? evsel->attr.exclude_guest : 0;
1371 	int eI = evsel ? evsel->attr.exclude_idle : 0;
1372 	int precise = evsel ? evsel->attr.precise_ip : 0;
1373 	int precise_max = 0;
1374 	int sample_read = 0;
1375 	int pinned = evsel ? evsel->attr.pinned : 0;
1376 
1377 	int exclude = eu | ek | eh;
1378 	int exclude_GH = evsel ? evsel->exclude_GH : 0;
1379 
1380 	memset(mod, 0, sizeof(*mod));
1381 
1382 	while (*str) {
1383 		if (*str == 'u') {
1384 			if (!exclude)
1385 				exclude = eu = ek = eh = 1;
1386 			eu = 0;
1387 		} else if (*str == 'k') {
1388 			if (!exclude)
1389 				exclude = eu = ek = eh = 1;
1390 			ek = 0;
1391 		} else if (*str == 'h') {
1392 			if (!exclude)
1393 				exclude = eu = ek = eh = 1;
1394 			eh = 0;
1395 		} else if (*str == 'G') {
1396 			if (!exclude_GH)
1397 				exclude_GH = eG = eH = 1;
1398 			eG = 0;
1399 		} else if (*str == 'H') {
1400 			if (!exclude_GH)
1401 				exclude_GH = eG = eH = 1;
1402 			eH = 0;
1403 		} else if (*str == 'I') {
1404 			eI = 1;
1405 		} else if (*str == 'p') {
1406 			precise++;
1407 			/* use of precise requires exclude_guest */
1408 			if (!exclude_GH)
1409 				eG = 1;
1410 		} else if (*str == 'P') {
1411 			precise_max = 1;
1412 		} else if (*str == 'S') {
1413 			sample_read = 1;
1414 		} else if (*str == 'D') {
1415 			pinned = 1;
1416 		} else
1417 			break;
1418 
1419 		++str;
1420 	}
1421 
1422 	/*
1423 	 * precise ip:
1424 	 *
1425 	 *  0 - SAMPLE_IP can have arbitrary skid
1426 	 *  1 - SAMPLE_IP must have constant skid
1427 	 *  2 - SAMPLE_IP requested to have 0 skid
1428 	 *  3 - SAMPLE_IP must have 0 skid
1429 	 *
1430 	 *  See also PERF_RECORD_MISC_EXACT_IP
1431 	 */
1432 	if (precise > 3)
1433 		return -EINVAL;
1434 
1435 	mod->eu = eu;
1436 	mod->ek = ek;
1437 	mod->eh = eh;
1438 	mod->eH = eH;
1439 	mod->eG = eG;
1440 	mod->eI = eI;
1441 	mod->precise = precise;
1442 	mod->precise_max = precise_max;
1443 	mod->exclude_GH = exclude_GH;
1444 	mod->sample_read = sample_read;
1445 	mod->pinned = pinned;
1446 
1447 	return 0;
1448 }
1449 
1450 /*
1451  * Basic modifier sanity check to validate it contains only one
1452  * instance of any modifier (apart from 'p') present.
1453  */
1454 static int check_modifier(char *str)
1455 {
1456 	char *p = str;
1457 
1458 	/* The sizeof includes 0 byte as well. */
1459 	if (strlen(str) > (sizeof("ukhGHpppPSDI") - 1))
1460 		return -1;
1461 
1462 	while (*p) {
1463 		if (*p != 'p' && strchr(p + 1, *p))
1464 			return -1;
1465 		p++;
1466 	}
1467 
1468 	return 0;
1469 }
1470 
1471 int parse_events__modifier_event(struct list_head *list, char *str, bool add)
1472 {
1473 	struct perf_evsel *evsel;
1474 	struct event_modifier mod;
1475 
1476 	if (str == NULL)
1477 		return 0;
1478 
1479 	if (check_modifier(str))
1480 		return -EINVAL;
1481 
1482 	if (!add && get_event_modifier(&mod, str, NULL))
1483 		return -EINVAL;
1484 
1485 	__evlist__for_each_entry(list, evsel) {
1486 		if (add && get_event_modifier(&mod, str, evsel))
1487 			return -EINVAL;
1488 
1489 		evsel->attr.exclude_user   = mod.eu;
1490 		evsel->attr.exclude_kernel = mod.ek;
1491 		evsel->attr.exclude_hv     = mod.eh;
1492 		evsel->attr.precise_ip     = mod.precise;
1493 		evsel->attr.exclude_host   = mod.eH;
1494 		evsel->attr.exclude_guest  = mod.eG;
1495 		evsel->attr.exclude_idle   = mod.eI;
1496 		evsel->exclude_GH          = mod.exclude_GH;
1497 		evsel->sample_read         = mod.sample_read;
1498 		evsel->precise_max         = mod.precise_max;
1499 
1500 		if (perf_evsel__is_group_leader(evsel))
1501 			evsel->attr.pinned = mod.pinned;
1502 	}
1503 
1504 	return 0;
1505 }
1506 
1507 int parse_events_name(struct list_head *list, char *name)
1508 {
1509 	struct perf_evsel *evsel;
1510 
1511 	__evlist__for_each_entry(list, evsel) {
1512 		if (!evsel->name)
1513 			evsel->name = strdup(name);
1514 	}
1515 
1516 	return 0;
1517 }
1518 
1519 static int
1520 comp_pmu(const void *p1, const void *p2)
1521 {
1522 	struct perf_pmu_event_symbol *pmu1 = (struct perf_pmu_event_symbol *) p1;
1523 	struct perf_pmu_event_symbol *pmu2 = (struct perf_pmu_event_symbol *) p2;
1524 
1525 	return strcasecmp(pmu1->symbol, pmu2->symbol);
1526 }
1527 
1528 static void perf_pmu__parse_cleanup(void)
1529 {
1530 	if (perf_pmu_events_list_num > 0) {
1531 		struct perf_pmu_event_symbol *p;
1532 		int i;
1533 
1534 		for (i = 0; i < perf_pmu_events_list_num; i++) {
1535 			p = perf_pmu_events_list + i;
1536 			zfree(&p->symbol);
1537 		}
1538 		zfree(&perf_pmu_events_list);
1539 		perf_pmu_events_list_num = 0;
1540 	}
1541 }
1542 
1543 #define SET_SYMBOL(str, stype)		\
1544 do {					\
1545 	p->symbol = str;		\
1546 	if (!p->symbol)			\
1547 		goto err;		\
1548 	p->type = stype;		\
1549 } while (0)
1550 
1551 /*
1552  * Read the pmu events list from sysfs
1553  * Save it into perf_pmu_events_list
1554  */
1555 static void perf_pmu__parse_init(void)
1556 {
1557 
1558 	struct perf_pmu *pmu = NULL;
1559 	struct perf_pmu_alias *alias;
1560 	int len = 0;
1561 
1562 	pmu = NULL;
1563 	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1564 		list_for_each_entry(alias, &pmu->aliases, list) {
1565 			if (strchr(alias->name, '-'))
1566 				len++;
1567 			len++;
1568 		}
1569 	}
1570 
1571 	if (len == 0) {
1572 		perf_pmu_events_list_num = -1;
1573 		return;
1574 	}
1575 	perf_pmu_events_list = malloc(sizeof(struct perf_pmu_event_symbol) * len);
1576 	if (!perf_pmu_events_list)
1577 		return;
1578 	perf_pmu_events_list_num = len;
1579 
1580 	len = 0;
1581 	pmu = NULL;
1582 	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1583 		list_for_each_entry(alias, &pmu->aliases, list) {
1584 			struct perf_pmu_event_symbol *p = perf_pmu_events_list + len;
1585 			char *tmp = strchr(alias->name, '-');
1586 
1587 			if (tmp != NULL) {
1588 				SET_SYMBOL(strndup(alias->name, tmp - alias->name),
1589 						PMU_EVENT_SYMBOL_PREFIX);
1590 				p++;
1591 				SET_SYMBOL(strdup(++tmp), PMU_EVENT_SYMBOL_SUFFIX);
1592 				len += 2;
1593 			} else {
1594 				SET_SYMBOL(strdup(alias->name), PMU_EVENT_SYMBOL);
1595 				len++;
1596 			}
1597 		}
1598 	}
1599 	qsort(perf_pmu_events_list, len,
1600 		sizeof(struct perf_pmu_event_symbol), comp_pmu);
1601 
1602 	return;
1603 err:
1604 	perf_pmu__parse_cleanup();
1605 }
1606 
1607 enum perf_pmu_event_symbol_type
1608 perf_pmu__parse_check(const char *name)
1609 {
1610 	struct perf_pmu_event_symbol p, *r;
1611 
1612 	/* scan kernel pmu events from sysfs if needed */
1613 	if (perf_pmu_events_list_num == 0)
1614 		perf_pmu__parse_init();
1615 	/*
1616 	 * name "cpu" could be prefix of cpu-cycles or cpu// events.
1617 	 * cpu-cycles has been handled by hardcode.
1618 	 * So it must be cpu// events, not kernel pmu event.
1619 	 */
1620 	if ((perf_pmu_events_list_num <= 0) || !strcmp(name, "cpu"))
1621 		return PMU_EVENT_SYMBOL_ERR;
1622 
1623 	p.symbol = strdup(name);
1624 	r = bsearch(&p, perf_pmu_events_list,
1625 			(size_t) perf_pmu_events_list_num,
1626 			sizeof(struct perf_pmu_event_symbol), comp_pmu);
1627 	zfree(&p.symbol);
1628 	return r ? r->type : PMU_EVENT_SYMBOL_ERR;
1629 }
1630 
1631 static int parse_events__scanner(const char *str, void *data, int start_token)
1632 {
1633 	YY_BUFFER_STATE buffer;
1634 	void *scanner;
1635 	int ret;
1636 
1637 	ret = parse_events_lex_init_extra(start_token, &scanner);
1638 	if (ret)
1639 		return ret;
1640 
1641 	buffer = parse_events__scan_string(str, scanner);
1642 
1643 #ifdef PARSER_DEBUG
1644 	parse_events_debug = 1;
1645 #endif
1646 	ret = parse_events_parse(data, scanner);
1647 
1648 	parse_events__flush_buffer(buffer, scanner);
1649 	parse_events__delete_buffer(buffer, scanner);
1650 	parse_events_lex_destroy(scanner);
1651 	return ret;
1652 }
1653 
1654 /*
1655  * parse event config string, return a list of event terms.
1656  */
1657 int parse_events_terms(struct list_head *terms, const char *str)
1658 {
1659 	struct parse_events_terms data = {
1660 		.terms = NULL,
1661 	};
1662 	int ret;
1663 
1664 	ret = parse_events__scanner(str, &data, PE_START_TERMS);
1665 	if (!ret) {
1666 		list_splice(data.terms, terms);
1667 		zfree(&data.terms);
1668 		return 0;
1669 	}
1670 
1671 	parse_events_terms__delete(data.terms);
1672 	return ret;
1673 }
1674 
1675 int parse_events(struct perf_evlist *evlist, const char *str,
1676 		 struct parse_events_error *err)
1677 {
1678 	struct parse_events_evlist data = {
1679 		.list   = LIST_HEAD_INIT(data.list),
1680 		.idx    = evlist->nr_entries,
1681 		.error  = err,
1682 		.evlist = evlist,
1683 	};
1684 	int ret;
1685 
1686 	ret = parse_events__scanner(str, &data, PE_START_EVENTS);
1687 	perf_pmu__parse_cleanup();
1688 	if (!ret) {
1689 		struct perf_evsel *last;
1690 
1691 		if (list_empty(&data.list)) {
1692 			WARN_ONCE(true, "WARNING: event parser found nothing");
1693 			return -1;
1694 		}
1695 
1696 		perf_evlist__splice_list_tail(evlist, &data.list);
1697 		evlist->nr_groups += data.nr_groups;
1698 		last = perf_evlist__last(evlist);
1699 		last->cmdline_group_boundary = true;
1700 
1701 		return 0;
1702 	}
1703 
1704 	/*
1705 	 * There are 2 users - builtin-record and builtin-test objects.
1706 	 * Both call perf_evlist__delete in case of error, so we dont
1707 	 * need to bother.
1708 	 */
1709 	return ret;
1710 }
1711 
1712 #define MAX_WIDTH 1000
1713 static int get_term_width(void)
1714 {
1715 	struct winsize ws;
1716 
1717 	get_term_dimensions(&ws);
1718 	return ws.ws_col > MAX_WIDTH ? MAX_WIDTH : ws.ws_col;
1719 }
1720 
1721 static void parse_events_print_error(struct parse_events_error *err,
1722 				     const char *event)
1723 {
1724 	const char *str = "invalid or unsupported event: ";
1725 	char _buf[MAX_WIDTH];
1726 	char *buf = (char *) event;
1727 	int idx = 0;
1728 
1729 	if (err->str) {
1730 		/* -2 for extra '' in the final fprintf */
1731 		int width       = get_term_width() - 2;
1732 		int len_event   = strlen(event);
1733 		int len_str, max_len, cut = 0;
1734 
1735 		/*
1736 		 * Maximum error index indent, we will cut
1737 		 * the event string if it's bigger.
1738 		 */
1739 		int max_err_idx = 13;
1740 
1741 		/*
1742 		 * Let's be specific with the message when
1743 		 * we have the precise error.
1744 		 */
1745 		str     = "event syntax error: ";
1746 		len_str = strlen(str);
1747 		max_len = width - len_str;
1748 
1749 		buf = _buf;
1750 
1751 		/* We're cutting from the beginning. */
1752 		if (err->idx > max_err_idx)
1753 			cut = err->idx - max_err_idx;
1754 
1755 		strncpy(buf, event + cut, max_len);
1756 
1757 		/* Mark cut parts with '..' on both sides. */
1758 		if (cut)
1759 			buf[0] = buf[1] = '.';
1760 
1761 		if ((len_event - cut) > max_len) {
1762 			buf[max_len - 1] = buf[max_len - 2] = '.';
1763 			buf[max_len] = 0;
1764 		}
1765 
1766 		idx = len_str + err->idx - cut;
1767 	}
1768 
1769 	fprintf(stderr, "%s'%s'\n", str, buf);
1770 	if (idx) {
1771 		fprintf(stderr, "%*s\\___ %s\n", idx + 1, "", err->str);
1772 		if (err->help)
1773 			fprintf(stderr, "\n%s\n", err->help);
1774 		zfree(&err->str);
1775 		zfree(&err->help);
1776 	}
1777 
1778 	fprintf(stderr, "Run 'perf list' for a list of valid events\n");
1779 }
1780 
1781 #undef MAX_WIDTH
1782 
1783 int parse_events_option(const struct option *opt, const char *str,
1784 			int unset __maybe_unused)
1785 {
1786 	struct perf_evlist *evlist = *(struct perf_evlist **)opt->value;
1787 	struct parse_events_error err = { .idx = 0, };
1788 	int ret = parse_events(evlist, str, &err);
1789 
1790 	if (ret)
1791 		parse_events_print_error(&err, str);
1792 
1793 	return ret;
1794 }
1795 
1796 static int
1797 foreach_evsel_in_last_glob(struct perf_evlist *evlist,
1798 			   int (*func)(struct perf_evsel *evsel,
1799 				       const void *arg),
1800 			   const void *arg)
1801 {
1802 	struct perf_evsel *last = NULL;
1803 	int err;
1804 
1805 	/*
1806 	 * Don't return when list_empty, give func a chance to report
1807 	 * error when it found last == NULL.
1808 	 *
1809 	 * So no need to WARN here, let *func do this.
1810 	 */
1811 	if (evlist->nr_entries > 0)
1812 		last = perf_evlist__last(evlist);
1813 
1814 	do {
1815 		err = (*func)(last, arg);
1816 		if (err)
1817 			return -1;
1818 		if (!last)
1819 			return 0;
1820 
1821 		if (last->node.prev == &evlist->entries)
1822 			return 0;
1823 		last = list_entry(last->node.prev, struct perf_evsel, node);
1824 	} while (!last->cmdline_group_boundary);
1825 
1826 	return 0;
1827 }
1828 
1829 static int set_filter(struct perf_evsel *evsel, const void *arg)
1830 {
1831 	const char *str = arg;
1832 	bool found = false;
1833 	int nr_addr_filters = 0;
1834 	struct perf_pmu *pmu = NULL;
1835 
1836 	if (evsel == NULL)
1837 		goto err;
1838 
1839 	if (evsel->attr.type == PERF_TYPE_TRACEPOINT) {
1840 		if (perf_evsel__append_tp_filter(evsel, str) < 0) {
1841 			fprintf(stderr,
1842 				"not enough memory to hold filter string\n");
1843 			return -1;
1844 		}
1845 
1846 		return 0;
1847 	}
1848 
1849 	while ((pmu = perf_pmu__scan(pmu)) != NULL)
1850 		if (pmu->type == evsel->attr.type) {
1851 			found = true;
1852 			break;
1853 		}
1854 
1855 	if (found)
1856 		perf_pmu__scan_file(pmu, "nr_addr_filters",
1857 				    "%d", &nr_addr_filters);
1858 
1859 	if (!nr_addr_filters)
1860 		goto err;
1861 
1862 	if (perf_evsel__append_addr_filter(evsel, str) < 0) {
1863 		fprintf(stderr,
1864 			"not enough memory to hold filter string\n");
1865 		return -1;
1866 	}
1867 
1868 	return 0;
1869 
1870 err:
1871 	fprintf(stderr,
1872 		"--filter option should follow a -e tracepoint or HW tracer option\n");
1873 
1874 	return -1;
1875 }
1876 
1877 int parse_filter(const struct option *opt, const char *str,
1878 		 int unset __maybe_unused)
1879 {
1880 	struct perf_evlist *evlist = *(struct perf_evlist **)opt->value;
1881 
1882 	return foreach_evsel_in_last_glob(evlist, set_filter,
1883 					  (const void *)str);
1884 }
1885 
1886 static int add_exclude_perf_filter(struct perf_evsel *evsel,
1887 				   const void *arg __maybe_unused)
1888 {
1889 	char new_filter[64];
1890 
1891 	if (evsel == NULL || evsel->attr.type != PERF_TYPE_TRACEPOINT) {
1892 		fprintf(stderr,
1893 			"--exclude-perf option should follow a -e tracepoint option\n");
1894 		return -1;
1895 	}
1896 
1897 	snprintf(new_filter, sizeof(new_filter), "common_pid != %d", getpid());
1898 
1899 	if (perf_evsel__append_tp_filter(evsel, new_filter) < 0) {
1900 		fprintf(stderr,
1901 			"not enough memory to hold filter string\n");
1902 		return -1;
1903 	}
1904 
1905 	return 0;
1906 }
1907 
1908 int exclude_perf(const struct option *opt,
1909 		 const char *arg __maybe_unused,
1910 		 int unset __maybe_unused)
1911 {
1912 	struct perf_evlist *evlist = *(struct perf_evlist **)opt->value;
1913 
1914 	return foreach_evsel_in_last_glob(evlist, add_exclude_perf_filter,
1915 					  NULL);
1916 }
1917 
1918 static const char * const event_type_descriptors[] = {
1919 	"Hardware event",
1920 	"Software event",
1921 	"Tracepoint event",
1922 	"Hardware cache event",
1923 	"Raw hardware event descriptor",
1924 	"Hardware breakpoint",
1925 };
1926 
1927 static int cmp_string(const void *a, const void *b)
1928 {
1929 	const char * const *as = a;
1930 	const char * const *bs = b;
1931 
1932 	return strcmp(*as, *bs);
1933 }
1934 
1935 /*
1936  * Print the events from <debugfs_mount_point>/tracing/events
1937  */
1938 
1939 void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
1940 			     bool name_only)
1941 {
1942 	DIR *sys_dir, *evt_dir;
1943 	struct dirent *sys_dirent, *evt_dirent;
1944 	char evt_path[MAXPATHLEN];
1945 	char dir_path[MAXPATHLEN];
1946 	char **evt_list = NULL;
1947 	unsigned int evt_i = 0, evt_num = 0;
1948 	bool evt_num_known = false;
1949 
1950 restart:
1951 	sys_dir = opendir(tracing_events_path);
1952 	if (!sys_dir)
1953 		return;
1954 
1955 	if (evt_num_known) {
1956 		evt_list = zalloc(sizeof(char *) * evt_num);
1957 		if (!evt_list)
1958 			goto out_close_sys_dir;
1959 	}
1960 
1961 	for_each_subsystem(sys_dir, sys_dirent) {
1962 		if (subsys_glob != NULL &&
1963 		    !strglobmatch(sys_dirent->d_name, subsys_glob))
1964 			continue;
1965 
1966 		snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
1967 			 sys_dirent->d_name);
1968 		evt_dir = opendir(dir_path);
1969 		if (!evt_dir)
1970 			continue;
1971 
1972 		for_each_event(sys_dirent, evt_dir, evt_dirent) {
1973 			if (event_glob != NULL &&
1974 			    !strglobmatch(evt_dirent->d_name, event_glob))
1975 				continue;
1976 
1977 			if (!evt_num_known) {
1978 				evt_num++;
1979 				continue;
1980 			}
1981 
1982 			snprintf(evt_path, MAXPATHLEN, "%s:%s",
1983 				 sys_dirent->d_name, evt_dirent->d_name);
1984 
1985 			evt_list[evt_i] = strdup(evt_path);
1986 			if (evt_list[evt_i] == NULL)
1987 				goto out_close_evt_dir;
1988 			evt_i++;
1989 		}
1990 		closedir(evt_dir);
1991 	}
1992 	closedir(sys_dir);
1993 
1994 	if (!evt_num_known) {
1995 		evt_num_known = true;
1996 		goto restart;
1997 	}
1998 	qsort(evt_list, evt_num, sizeof(char *), cmp_string);
1999 	evt_i = 0;
2000 	while (evt_i < evt_num) {
2001 		if (name_only) {
2002 			printf("%s ", evt_list[evt_i++]);
2003 			continue;
2004 		}
2005 		printf("  %-50s [%s]\n", evt_list[evt_i++],
2006 				event_type_descriptors[PERF_TYPE_TRACEPOINT]);
2007 	}
2008 	if (evt_num && pager_in_use())
2009 		printf("\n");
2010 
2011 out_free:
2012 	evt_num = evt_i;
2013 	for (evt_i = 0; evt_i < evt_num; evt_i++)
2014 		zfree(&evt_list[evt_i]);
2015 	zfree(&evt_list);
2016 	return;
2017 
2018 out_close_evt_dir:
2019 	closedir(evt_dir);
2020 out_close_sys_dir:
2021 	closedir(sys_dir);
2022 
2023 	printf("FATAL: not enough memory to print %s\n",
2024 			event_type_descriptors[PERF_TYPE_TRACEPOINT]);
2025 	if (evt_list)
2026 		goto out_free;
2027 }
2028 
2029 /*
2030  * Check whether event is in <debugfs_mount_point>/tracing/events
2031  */
2032 
2033 int is_valid_tracepoint(const char *event_string)
2034 {
2035 	DIR *sys_dir, *evt_dir;
2036 	struct dirent *sys_dirent, *evt_dirent;
2037 	char evt_path[MAXPATHLEN];
2038 	char dir_path[MAXPATHLEN];
2039 
2040 	sys_dir = opendir(tracing_events_path);
2041 	if (!sys_dir)
2042 		return 0;
2043 
2044 	for_each_subsystem(sys_dir, sys_dirent) {
2045 
2046 		snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
2047 			 sys_dirent->d_name);
2048 		evt_dir = opendir(dir_path);
2049 		if (!evt_dir)
2050 			continue;
2051 
2052 		for_each_event(sys_dirent, evt_dir, evt_dirent) {
2053 			snprintf(evt_path, MAXPATHLEN, "%s:%s",
2054 				 sys_dirent->d_name, evt_dirent->d_name);
2055 			if (!strcmp(evt_path, event_string)) {
2056 				closedir(evt_dir);
2057 				closedir(sys_dir);
2058 				return 1;
2059 			}
2060 		}
2061 		closedir(evt_dir);
2062 	}
2063 	closedir(sys_dir);
2064 	return 0;
2065 }
2066 
2067 static bool is_event_supported(u8 type, unsigned config)
2068 {
2069 	bool ret = true;
2070 	int open_return;
2071 	struct perf_evsel *evsel;
2072 	struct perf_event_attr attr = {
2073 		.type = type,
2074 		.config = config,
2075 		.disabled = 1,
2076 	};
2077 	struct thread_map *tmap = thread_map__new_by_tid(0);
2078 
2079 	if (tmap == NULL)
2080 		return false;
2081 
2082 	evsel = perf_evsel__new(&attr);
2083 	if (evsel) {
2084 		open_return = perf_evsel__open(evsel, NULL, tmap);
2085 		ret = open_return >= 0;
2086 
2087 		if (open_return == -EACCES) {
2088 			/*
2089 			 * This happens if the paranoid value
2090 			 * /proc/sys/kernel/perf_event_paranoid is set to 2
2091 			 * Re-run with exclude_kernel set; we don't do that
2092 			 * by default as some ARM machines do not support it.
2093 			 *
2094 			 */
2095 			evsel->attr.exclude_kernel = 1;
2096 			ret = perf_evsel__open(evsel, NULL, tmap) >= 0;
2097 		}
2098 		perf_evsel__delete(evsel);
2099 	}
2100 
2101 	return ret;
2102 }
2103 
2104 void print_sdt_events(const char *subsys_glob, const char *event_glob,
2105 		      bool name_only)
2106 {
2107 	struct probe_cache *pcache;
2108 	struct probe_cache_entry *ent;
2109 	struct strlist *bidlist, *sdtlist;
2110 	struct strlist_config cfg = {.dont_dupstr = true};
2111 	struct str_node *nd, *nd2;
2112 	char *buf, *path, *ptr = NULL;
2113 	bool show_detail = false;
2114 	int ret;
2115 
2116 	sdtlist = strlist__new(NULL, &cfg);
2117 	if (!sdtlist) {
2118 		pr_debug("Failed to allocate new strlist for SDT\n");
2119 		return;
2120 	}
2121 	bidlist = build_id_cache__list_all(true);
2122 	if (!bidlist) {
2123 		pr_debug("Failed to get buildids: %d\n", errno);
2124 		return;
2125 	}
2126 	strlist__for_each_entry(nd, bidlist) {
2127 		pcache = probe_cache__new(nd->s);
2128 		if (!pcache)
2129 			continue;
2130 		list_for_each_entry(ent, &pcache->entries, node) {
2131 			if (!ent->sdt)
2132 				continue;
2133 			if (subsys_glob &&
2134 			    !strglobmatch(ent->pev.group, subsys_glob))
2135 				continue;
2136 			if (event_glob &&
2137 			    !strglobmatch(ent->pev.event, event_glob))
2138 				continue;
2139 			ret = asprintf(&buf, "%s:%s@%s", ent->pev.group,
2140 					ent->pev.event, nd->s);
2141 			if (ret > 0)
2142 				strlist__add(sdtlist, buf);
2143 		}
2144 		probe_cache__delete(pcache);
2145 	}
2146 	strlist__delete(bidlist);
2147 
2148 	strlist__for_each_entry(nd, sdtlist) {
2149 		buf = strchr(nd->s, '@');
2150 		if (buf)
2151 			*(buf++) = '\0';
2152 		if (name_only) {
2153 			printf("%s ", nd->s);
2154 			continue;
2155 		}
2156 		nd2 = strlist__next(nd);
2157 		if (nd2) {
2158 			ptr = strchr(nd2->s, '@');
2159 			if (ptr)
2160 				*ptr = '\0';
2161 			if (strcmp(nd->s, nd2->s) == 0)
2162 				show_detail = true;
2163 		}
2164 		if (show_detail) {
2165 			path = build_id_cache__origname(buf);
2166 			ret = asprintf(&buf, "%s@%s(%.12s)", nd->s, path, buf);
2167 			if (ret > 0) {
2168 				printf("  %-50s [%s]\n", buf, "SDT event");
2169 				free(buf);
2170 			}
2171 		} else
2172 			printf("  %-50s [%s]\n", nd->s, "SDT event");
2173 		if (nd2) {
2174 			if (strcmp(nd->s, nd2->s) != 0)
2175 				show_detail = false;
2176 			if (ptr)
2177 				*ptr = '@';
2178 		}
2179 	}
2180 	strlist__delete(sdtlist);
2181 }
2182 
2183 int print_hwcache_events(const char *event_glob, bool name_only)
2184 {
2185 	unsigned int type, op, i, evt_i = 0, evt_num = 0;
2186 	char name[64];
2187 	char **evt_list = NULL;
2188 	bool evt_num_known = false;
2189 
2190 restart:
2191 	if (evt_num_known) {
2192 		evt_list = zalloc(sizeof(char *) * evt_num);
2193 		if (!evt_list)
2194 			goto out_enomem;
2195 	}
2196 
2197 	for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
2198 		for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
2199 			/* skip invalid cache type */
2200 			if (!perf_evsel__is_cache_op_valid(type, op))
2201 				continue;
2202 
2203 			for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
2204 				__perf_evsel__hw_cache_type_op_res_name(type, op, i,
2205 									name, sizeof(name));
2206 				if (event_glob != NULL && !strglobmatch(name, event_glob))
2207 					continue;
2208 
2209 				if (!is_event_supported(PERF_TYPE_HW_CACHE,
2210 							type | (op << 8) | (i << 16)))
2211 					continue;
2212 
2213 				if (!evt_num_known) {
2214 					evt_num++;
2215 					continue;
2216 				}
2217 
2218 				evt_list[evt_i] = strdup(name);
2219 				if (evt_list[evt_i] == NULL)
2220 					goto out_enomem;
2221 				evt_i++;
2222 			}
2223 		}
2224 	}
2225 
2226 	if (!evt_num_known) {
2227 		evt_num_known = true;
2228 		goto restart;
2229 	}
2230 	qsort(evt_list, evt_num, sizeof(char *), cmp_string);
2231 	evt_i = 0;
2232 	while (evt_i < evt_num) {
2233 		if (name_only) {
2234 			printf("%s ", evt_list[evt_i++]);
2235 			continue;
2236 		}
2237 		printf("  %-50s [%s]\n", evt_list[evt_i++],
2238 				event_type_descriptors[PERF_TYPE_HW_CACHE]);
2239 	}
2240 	if (evt_num && pager_in_use())
2241 		printf("\n");
2242 
2243 out_free:
2244 	evt_num = evt_i;
2245 	for (evt_i = 0; evt_i < evt_num; evt_i++)
2246 		zfree(&evt_list[evt_i]);
2247 	zfree(&evt_list);
2248 	return evt_num;
2249 
2250 out_enomem:
2251 	printf("FATAL: not enough memory to print %s\n", event_type_descriptors[PERF_TYPE_HW_CACHE]);
2252 	if (evt_list)
2253 		goto out_free;
2254 	return evt_num;
2255 }
2256 
2257 void print_symbol_events(const char *event_glob, unsigned type,
2258 				struct event_symbol *syms, unsigned max,
2259 				bool name_only)
2260 {
2261 	unsigned int i, evt_i = 0, evt_num = 0;
2262 	char name[MAX_NAME_LEN];
2263 	char **evt_list = NULL;
2264 	bool evt_num_known = false;
2265 
2266 restart:
2267 	if (evt_num_known) {
2268 		evt_list = zalloc(sizeof(char *) * evt_num);
2269 		if (!evt_list)
2270 			goto out_enomem;
2271 		syms -= max;
2272 	}
2273 
2274 	for (i = 0; i < max; i++, syms++) {
2275 
2276 		if (event_glob != NULL && syms->symbol != NULL &&
2277 		    !(strglobmatch(syms->symbol, event_glob) ||
2278 		      (syms->alias && strglobmatch(syms->alias, event_glob))))
2279 			continue;
2280 
2281 		if (!is_event_supported(type, i))
2282 			continue;
2283 
2284 		if (!evt_num_known) {
2285 			evt_num++;
2286 			continue;
2287 		}
2288 
2289 		if (!name_only && strlen(syms->alias))
2290 			snprintf(name, MAX_NAME_LEN, "%s OR %s", syms->symbol, syms->alias);
2291 		else
2292 			strncpy(name, syms->symbol, MAX_NAME_LEN);
2293 
2294 		evt_list[evt_i] = strdup(name);
2295 		if (evt_list[evt_i] == NULL)
2296 			goto out_enomem;
2297 		evt_i++;
2298 	}
2299 
2300 	if (!evt_num_known) {
2301 		evt_num_known = true;
2302 		goto restart;
2303 	}
2304 	qsort(evt_list, evt_num, sizeof(char *), cmp_string);
2305 	evt_i = 0;
2306 	while (evt_i < evt_num) {
2307 		if (name_only) {
2308 			printf("%s ", evt_list[evt_i++]);
2309 			continue;
2310 		}
2311 		printf("  %-50s [%s]\n", evt_list[evt_i++], event_type_descriptors[type]);
2312 	}
2313 	if (evt_num && pager_in_use())
2314 		printf("\n");
2315 
2316 out_free:
2317 	evt_num = evt_i;
2318 	for (evt_i = 0; evt_i < evt_num; evt_i++)
2319 		zfree(&evt_list[evt_i]);
2320 	zfree(&evt_list);
2321 	return;
2322 
2323 out_enomem:
2324 	printf("FATAL: not enough memory to print %s\n", event_type_descriptors[type]);
2325 	if (evt_list)
2326 		goto out_free;
2327 }
2328 
2329 /*
2330  * Print the help text for the event symbols:
2331  */
2332 void print_events(const char *event_glob, bool name_only, bool quiet_flag,
2333 			bool long_desc, bool details_flag)
2334 {
2335 	print_symbol_events(event_glob, PERF_TYPE_HARDWARE,
2336 			    event_symbols_hw, PERF_COUNT_HW_MAX, name_only);
2337 
2338 	print_symbol_events(event_glob, PERF_TYPE_SOFTWARE,
2339 			    event_symbols_sw, PERF_COUNT_SW_MAX, name_only);
2340 
2341 	print_hwcache_events(event_glob, name_only);
2342 
2343 	print_pmu_events(event_glob, name_only, quiet_flag, long_desc,
2344 			details_flag);
2345 
2346 	if (event_glob != NULL)
2347 		return;
2348 
2349 	if (!name_only) {
2350 		printf("  %-50s [%s]\n",
2351 		       "rNNN",
2352 		       event_type_descriptors[PERF_TYPE_RAW]);
2353 		printf("  %-50s [%s]\n",
2354 		       "cpu/t1=v1[,t2=v2,t3 ...]/modifier",
2355 		       event_type_descriptors[PERF_TYPE_RAW]);
2356 		if (pager_in_use())
2357 			printf("   (see 'man perf-list' on how to encode it)\n\n");
2358 
2359 		printf("  %-50s [%s]\n",
2360 		       "mem:<addr>[/len][:access]",
2361 			event_type_descriptors[PERF_TYPE_BREAKPOINT]);
2362 		if (pager_in_use())
2363 			printf("\n");
2364 	}
2365 
2366 	print_tracepoint_events(NULL, NULL, name_only);
2367 
2368 	print_sdt_events(NULL, NULL, name_only);
2369 }
2370 
2371 int parse_events__is_hardcoded_term(struct parse_events_term *term)
2372 {
2373 	return term->type_term != PARSE_EVENTS__TERM_TYPE_USER;
2374 }
2375 
2376 static int new_term(struct parse_events_term **_term,
2377 		    struct parse_events_term *temp,
2378 		    char *str, u64 num)
2379 {
2380 	struct parse_events_term *term;
2381 
2382 	term = malloc(sizeof(*term));
2383 	if (!term)
2384 		return -ENOMEM;
2385 
2386 	*term = *temp;
2387 	INIT_LIST_HEAD(&term->list);
2388 
2389 	switch (term->type_val) {
2390 	case PARSE_EVENTS__TERM_TYPE_NUM:
2391 		term->val.num = num;
2392 		break;
2393 	case PARSE_EVENTS__TERM_TYPE_STR:
2394 		term->val.str = str;
2395 		break;
2396 	default:
2397 		free(term);
2398 		return -EINVAL;
2399 	}
2400 
2401 	*_term = term;
2402 	return 0;
2403 }
2404 
2405 int parse_events_term__num(struct parse_events_term **term,
2406 			   int type_term, char *config, u64 num,
2407 			   bool no_value,
2408 			   void *loc_term_, void *loc_val_)
2409 {
2410 	YYLTYPE *loc_term = loc_term_;
2411 	YYLTYPE *loc_val = loc_val_;
2412 
2413 	struct parse_events_term temp = {
2414 		.type_val  = PARSE_EVENTS__TERM_TYPE_NUM,
2415 		.type_term = type_term,
2416 		.config    = config,
2417 		.no_value  = no_value,
2418 		.err_term  = loc_term ? loc_term->first_column : 0,
2419 		.err_val   = loc_val  ? loc_val->first_column  : 0,
2420 	};
2421 
2422 	return new_term(term, &temp, NULL, num);
2423 }
2424 
2425 int parse_events_term__str(struct parse_events_term **term,
2426 			   int type_term, char *config, char *str,
2427 			   void *loc_term_, void *loc_val_)
2428 {
2429 	YYLTYPE *loc_term = loc_term_;
2430 	YYLTYPE *loc_val = loc_val_;
2431 
2432 	struct parse_events_term temp = {
2433 		.type_val  = PARSE_EVENTS__TERM_TYPE_STR,
2434 		.type_term = type_term,
2435 		.config    = config,
2436 		.err_term  = loc_term ? loc_term->first_column : 0,
2437 		.err_val   = loc_val  ? loc_val->first_column  : 0,
2438 	};
2439 
2440 	return new_term(term, &temp, str, 0);
2441 }
2442 
2443 int parse_events_term__sym_hw(struct parse_events_term **term,
2444 			      char *config, unsigned idx)
2445 {
2446 	struct event_symbol *sym;
2447 	struct parse_events_term temp = {
2448 		.type_val  = PARSE_EVENTS__TERM_TYPE_STR,
2449 		.type_term = PARSE_EVENTS__TERM_TYPE_USER,
2450 		.config    = config ?: (char *) "event",
2451 	};
2452 
2453 	BUG_ON(idx >= PERF_COUNT_HW_MAX);
2454 	sym = &event_symbols_hw[idx];
2455 
2456 	return new_term(term, &temp, (char *) sym->symbol, 0);
2457 }
2458 
2459 int parse_events_term__clone(struct parse_events_term **new,
2460 			     struct parse_events_term *term)
2461 {
2462 	struct parse_events_term temp = {
2463 		.type_val  = term->type_val,
2464 		.type_term = term->type_term,
2465 		.config    = term->config,
2466 		.err_term  = term->err_term,
2467 		.err_val   = term->err_val,
2468 	};
2469 
2470 	return new_term(new, &temp, term->val.str, term->val.num);
2471 }
2472 
2473 int parse_events_copy_term_list(struct list_head *old,
2474 				 struct list_head **new)
2475 {
2476 	struct parse_events_term *term, *n;
2477 	int ret;
2478 
2479 	if (!old) {
2480 		*new = NULL;
2481 		return 0;
2482 	}
2483 
2484 	*new = malloc(sizeof(struct list_head));
2485 	if (!*new)
2486 		return -ENOMEM;
2487 	INIT_LIST_HEAD(*new);
2488 
2489 	list_for_each_entry (term, old, list) {
2490 		ret = parse_events_term__clone(&n, term);
2491 		if (ret)
2492 			return ret;
2493 		list_add_tail(&n->list, *new);
2494 	}
2495 	return 0;
2496 }
2497 
2498 void parse_events_terms__purge(struct list_head *terms)
2499 {
2500 	struct parse_events_term *term, *h;
2501 
2502 	list_for_each_entry_safe(term, h, terms, list) {
2503 		if (term->array.nr_ranges)
2504 			zfree(&term->array.ranges);
2505 		list_del_init(&term->list);
2506 		free(term);
2507 	}
2508 }
2509 
2510 void parse_events_terms__delete(struct list_head *terms)
2511 {
2512 	if (!terms)
2513 		return;
2514 	parse_events_terms__purge(terms);
2515 	free(terms);
2516 }
2517 
2518 void parse_events__clear_array(struct parse_events_array *a)
2519 {
2520 	zfree(&a->ranges);
2521 }
2522 
2523 void parse_events_evlist_error(struct parse_events_evlist *data,
2524 			       int idx, const char *str)
2525 {
2526 	struct parse_events_error *err = data->error;
2527 
2528 	if (!err)
2529 		return;
2530 	err->idx = idx;
2531 	err->str = strdup(str);
2532 	WARN_ONCE(!err->str, "WARNING: failed to allocate error string");
2533 }
2534 
2535 static void config_terms_list(char *buf, size_t buf_sz)
2536 {
2537 	int i;
2538 	bool first = true;
2539 
2540 	buf[0] = '\0';
2541 	for (i = 0; i < __PARSE_EVENTS__TERM_TYPE_NR; i++) {
2542 		const char *name = config_term_names[i];
2543 
2544 		if (!config_term_avail(i, NULL))
2545 			continue;
2546 		if (!name)
2547 			continue;
2548 		if (name[0] == '<')
2549 			continue;
2550 
2551 		if (strlen(buf) + strlen(name) + 2 >= buf_sz)
2552 			return;
2553 
2554 		if (!first)
2555 			strcat(buf, ",");
2556 		else
2557 			first = false;
2558 		strcat(buf, name);
2559 	}
2560 }
2561 
2562 /*
2563  * Return string contains valid config terms of an event.
2564  * @additional_terms: For terms such as PMU sysfs terms.
2565  */
2566 char *parse_events_formats_error_string(char *additional_terms)
2567 {
2568 	char *str;
2569 	/* "no-overwrite" is the longest name */
2570 	char static_terms[__PARSE_EVENTS__TERM_TYPE_NR *
2571 			  (sizeof("no-overwrite") - 1)];
2572 
2573 	config_terms_list(static_terms, sizeof(static_terms));
2574 	/* valid terms */
2575 	if (additional_terms) {
2576 		if (asprintf(&str, "valid terms: %s,%s",
2577 			     additional_terms, static_terms) < 0)
2578 			goto fail;
2579 	} else {
2580 		if (asprintf(&str, "valid terms: %s", static_terms) < 0)
2581 			goto fail;
2582 	}
2583 	return str;
2584 
2585 fail:
2586 	return NULL;
2587 }
2588