1 #include "../../../include/linux/hw_breakpoint.h"
2 #include "util.h"
3 #include "../perf.h"
4 #include "evlist.h"
5 #include "evsel.h"
6 #include "parse-options.h"
7 #include "parse-events.h"
8 #include "exec_cmd.h"
9 #include "string.h"
10 #include "symbol.h"
11 #include "cache.h"
12 #include "header.h"
13 #include "debugfs.h"
14 
15 struct event_symbol {
16 	u8		type;
17 	u64		config;
18 	const char	*symbol;
19 	const char	*alias;
20 };
21 
22 enum event_result {
23 	EVT_FAILED,
24 	EVT_HANDLED,
25 	EVT_HANDLED_ALL
26 };
27 
28 char debugfs_path[MAXPATHLEN];
29 
30 #define CHW(x) .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_##x
31 #define CSW(x) .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_##x
32 
33 static struct event_symbol event_symbols[] = {
34   { CHW(CPU_CYCLES),		"cpu-cycles",		"cycles"	},
35   { CHW(INSTRUCTIONS),		"instructions",		""		},
36   { CHW(CACHE_REFERENCES),	"cache-references",	""		},
37   { CHW(CACHE_MISSES),		"cache-misses",		""		},
38   { CHW(BRANCH_INSTRUCTIONS),	"branch-instructions",	"branches"	},
39   { CHW(BRANCH_MISSES),		"branch-misses",	""		},
40   { CHW(BUS_CYCLES),		"bus-cycles",		""		},
41 
42   { CSW(CPU_CLOCK),		"cpu-clock",		""		},
43   { CSW(TASK_CLOCK),		"task-clock",		""		},
44   { CSW(PAGE_FAULTS),		"page-faults",		"faults"	},
45   { CSW(PAGE_FAULTS_MIN),	"minor-faults",		""		},
46   { CSW(PAGE_FAULTS_MAJ),	"major-faults",		""		},
47   { CSW(CONTEXT_SWITCHES),	"context-switches",	"cs"		},
48   { CSW(CPU_MIGRATIONS),	"cpu-migrations",	"migrations"	},
49   { CSW(ALIGNMENT_FAULTS),	"alignment-faults",	""		},
50   { CSW(EMULATION_FAULTS),	"emulation-faults",	""		},
51 };
52 
53 #define __PERF_EVENT_FIELD(config, name) \
54 	((config & PERF_EVENT_##name##_MASK) >> PERF_EVENT_##name##_SHIFT)
55 
56 #define PERF_EVENT_RAW(config)	__PERF_EVENT_FIELD(config, RAW)
57 #define PERF_EVENT_CONFIG(config)	__PERF_EVENT_FIELD(config, CONFIG)
58 #define PERF_EVENT_TYPE(config)	__PERF_EVENT_FIELD(config, TYPE)
59 #define PERF_EVENT_ID(config)		__PERF_EVENT_FIELD(config, EVENT)
60 
61 static const char *hw_event_names[] = {
62 	"cycles",
63 	"instructions",
64 	"cache-references",
65 	"cache-misses",
66 	"branches",
67 	"branch-misses",
68 	"bus-cycles",
69 };
70 
71 static const char *sw_event_names[] = {
72 	"cpu-clock-msecs",
73 	"task-clock-msecs",
74 	"page-faults",
75 	"context-switches",
76 	"CPU-migrations",
77 	"minor-faults",
78 	"major-faults",
79 	"alignment-faults",
80 	"emulation-faults",
81 };
82 
83 #define MAX_ALIASES 8
84 
85 static const char *hw_cache[][MAX_ALIASES] = {
86  { "L1-dcache",	"l1-d",		"l1d",		"L1-data",		},
87  { "L1-icache",	"l1-i",		"l1i",		"L1-instruction",	},
88  { "LLC",	"L2"							},
89  { "dTLB",	"d-tlb",	"Data-TLB",				},
90  { "iTLB",	"i-tlb",	"Instruction-TLB",			},
91  { "branch",	"branches",	"bpu",		"btb",		"bpc",	},
92 };
93 
94 static const char *hw_cache_op[][MAX_ALIASES] = {
95  { "load",	"loads",	"read",					},
96  { "store",	"stores",	"write",				},
97  { "prefetch",	"prefetches",	"speculative-read", "speculative-load",	},
98 };
99 
100 static const char *hw_cache_result[][MAX_ALIASES] = {
101  { "refs",	"Reference",	"ops",		"access",		},
102  { "misses",	"miss",							},
103 };
104 
105 #define C(x)		PERF_COUNT_HW_CACHE_##x
106 #define CACHE_READ	(1 << C(OP_READ))
107 #define CACHE_WRITE	(1 << C(OP_WRITE))
108 #define CACHE_PREFETCH	(1 << C(OP_PREFETCH))
109 #define COP(x)		(1 << x)
110 
111 /*
112  * cache operartion stat
113  * L1I : Read and prefetch only
114  * ITLB and BPU : Read-only
115  */
116 static unsigned long hw_cache_stat[C(MAX)] = {
117  [C(L1D)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
118  [C(L1I)]	= (CACHE_READ | CACHE_PREFETCH),
119  [C(LL)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
120  [C(DTLB)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
121  [C(ITLB)]	= (CACHE_READ),
122  [C(BPU)]	= (CACHE_READ),
123 };
124 
125 #define for_each_subsystem(sys_dir, sys_dirent, sys_next)	       \
126 	while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next)	       \
127 	if (sys_dirent.d_type == DT_DIR &&				       \
128 	   (strcmp(sys_dirent.d_name, ".")) &&				       \
129 	   (strcmp(sys_dirent.d_name, "..")))
130 
tp_event_has_id(struct dirent * sys_dir,struct dirent * evt_dir)131 static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
132 {
133 	char evt_path[MAXPATHLEN];
134 	int fd;
135 
136 	snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
137 			sys_dir->d_name, evt_dir->d_name);
138 	fd = open(evt_path, O_RDONLY);
139 	if (fd < 0)
140 		return -EINVAL;
141 	close(fd);
142 
143 	return 0;
144 }
145 
146 #define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next)	       \
147 	while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next)        \
148 	if (evt_dirent.d_type == DT_DIR &&				       \
149 	   (strcmp(evt_dirent.d_name, ".")) &&				       \
150 	   (strcmp(evt_dirent.d_name, "..")) &&				       \
151 	   (!tp_event_has_id(&sys_dirent, &evt_dirent)))
152 
153 #define MAX_EVENT_LENGTH 512
154 
155 
tracepoint_id_to_path(u64 config)156 struct tracepoint_path *tracepoint_id_to_path(u64 config)
157 {
158 	struct tracepoint_path *path = NULL;
159 	DIR *sys_dir, *evt_dir;
160 	struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
161 	char id_buf[4];
162 	int fd;
163 	u64 id;
164 	char evt_path[MAXPATHLEN];
165 	char dir_path[MAXPATHLEN];
166 
167 	if (debugfs_valid_mountpoint(debugfs_path))
168 		return NULL;
169 
170 	sys_dir = opendir(debugfs_path);
171 	if (!sys_dir)
172 		return NULL;
173 
174 	for_each_subsystem(sys_dir, sys_dirent, sys_next) {
175 
176 		snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
177 			 sys_dirent.d_name);
178 		evt_dir = opendir(dir_path);
179 		if (!evt_dir)
180 			continue;
181 
182 		for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
183 
184 			snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
185 				 evt_dirent.d_name);
186 			fd = open(evt_path, O_RDONLY);
187 			if (fd < 0)
188 				continue;
189 			if (read(fd, id_buf, sizeof(id_buf)) < 0) {
190 				close(fd);
191 				continue;
192 			}
193 			close(fd);
194 			id = atoll(id_buf);
195 			if (id == config) {
196 				closedir(evt_dir);
197 				closedir(sys_dir);
198 				path = zalloc(sizeof(*path));
199 				path->system = malloc(MAX_EVENT_LENGTH);
200 				if (!path->system) {
201 					free(path);
202 					return NULL;
203 				}
204 				path->name = malloc(MAX_EVENT_LENGTH);
205 				if (!path->name) {
206 					free(path->system);
207 					free(path);
208 					return NULL;
209 				}
210 				strncpy(path->system, sys_dirent.d_name,
211 					MAX_EVENT_LENGTH);
212 				strncpy(path->name, evt_dirent.d_name,
213 					MAX_EVENT_LENGTH);
214 				return path;
215 			}
216 		}
217 		closedir(evt_dir);
218 	}
219 
220 	closedir(sys_dir);
221 	return NULL;
222 }
223 
224 #define TP_PATH_LEN (MAX_EVENT_LENGTH * 2 + 1)
tracepoint_id_to_name(u64 config)225 static const char *tracepoint_id_to_name(u64 config)
226 {
227 	static char buf[TP_PATH_LEN];
228 	struct tracepoint_path *path;
229 
230 	path = tracepoint_id_to_path(config);
231 	if (path) {
232 		snprintf(buf, TP_PATH_LEN, "%s:%s", path->system, path->name);
233 		free(path->name);
234 		free(path->system);
235 		free(path);
236 	} else
237 		snprintf(buf, TP_PATH_LEN, "%s:%s", "unknown", "unknown");
238 
239 	return buf;
240 }
241 
is_cache_op_valid(u8 cache_type,u8 cache_op)242 static int is_cache_op_valid(u8 cache_type, u8 cache_op)
243 {
244 	if (hw_cache_stat[cache_type] & COP(cache_op))
245 		return 1;	/* valid */
246 	else
247 		return 0;	/* invalid */
248 }
249 
event_cache_name(u8 cache_type,u8 cache_op,u8 cache_result)250 static char *event_cache_name(u8 cache_type, u8 cache_op, u8 cache_result)
251 {
252 	static char name[50];
253 
254 	if (cache_result) {
255 		sprintf(name, "%s-%s-%s", hw_cache[cache_type][0],
256 			hw_cache_op[cache_op][0],
257 			hw_cache_result[cache_result][0]);
258 	} else {
259 		sprintf(name, "%s-%s", hw_cache[cache_type][0],
260 			hw_cache_op[cache_op][1]);
261 	}
262 
263 	return name;
264 }
265 
event_type(int type)266 const char *event_type(int type)
267 {
268 	switch (type) {
269 	case PERF_TYPE_HARDWARE:
270 		return "hardware";
271 
272 	case PERF_TYPE_SOFTWARE:
273 		return "software";
274 
275 	case PERF_TYPE_TRACEPOINT:
276 		return "tracepoint";
277 
278 	case PERF_TYPE_HW_CACHE:
279 		return "hardware-cache";
280 
281 	default:
282 		break;
283 	}
284 
285 	return "unknown";
286 }
287 
event_name(struct perf_evsel * evsel)288 const char *event_name(struct perf_evsel *evsel)
289 {
290 	u64 config = evsel->attr.config;
291 	int type = evsel->attr.type;
292 
293 	if (evsel->name)
294 		return evsel->name;
295 
296 	return __event_name(type, config);
297 }
298 
__event_name(int type,u64 config)299 const char *__event_name(int type, u64 config)
300 {
301 	static char buf[32];
302 
303 	if (type == PERF_TYPE_RAW) {
304 		sprintf(buf, "raw 0x%" PRIx64, config);
305 		return buf;
306 	}
307 
308 	switch (type) {
309 	case PERF_TYPE_HARDWARE:
310 		if (config < PERF_COUNT_HW_MAX)
311 			return hw_event_names[config];
312 		return "unknown-hardware";
313 
314 	case PERF_TYPE_HW_CACHE: {
315 		u8 cache_type, cache_op, cache_result;
316 
317 		cache_type   = (config >>  0) & 0xff;
318 		if (cache_type > PERF_COUNT_HW_CACHE_MAX)
319 			return "unknown-ext-hardware-cache-type";
320 
321 		cache_op     = (config >>  8) & 0xff;
322 		if (cache_op > PERF_COUNT_HW_CACHE_OP_MAX)
323 			return "unknown-ext-hardware-cache-op";
324 
325 		cache_result = (config >> 16) & 0xff;
326 		if (cache_result > PERF_COUNT_HW_CACHE_RESULT_MAX)
327 			return "unknown-ext-hardware-cache-result";
328 
329 		if (!is_cache_op_valid(cache_type, cache_op))
330 			return "invalid-cache";
331 
332 		return event_cache_name(cache_type, cache_op, cache_result);
333 	}
334 
335 	case PERF_TYPE_SOFTWARE:
336 		if (config < PERF_COUNT_SW_MAX)
337 			return sw_event_names[config];
338 		return "unknown-software";
339 
340 	case PERF_TYPE_TRACEPOINT:
341 		return tracepoint_id_to_name(config);
342 
343 	default:
344 		break;
345 	}
346 
347 	return "unknown";
348 }
349 
parse_aliases(const char ** str,const char * names[][MAX_ALIASES],int size)350 static int parse_aliases(const char **str, const char *names[][MAX_ALIASES], int size)
351 {
352 	int i, j;
353 	int n, longest = -1;
354 
355 	for (i = 0; i < size; i++) {
356 		for (j = 0; j < MAX_ALIASES && names[i][j]; j++) {
357 			n = strlen(names[i][j]);
358 			if (n > longest && !strncasecmp(*str, names[i][j], n))
359 				longest = n;
360 		}
361 		if (longest > 0) {
362 			*str += longest;
363 			return i;
364 		}
365 	}
366 
367 	return -1;
368 }
369 
370 static enum event_result
parse_generic_hw_event(const char ** str,struct perf_event_attr * attr)371 parse_generic_hw_event(const char **str, struct perf_event_attr *attr)
372 {
373 	const char *s = *str;
374 	int cache_type = -1, cache_op = -1, cache_result = -1;
375 
376 	cache_type = parse_aliases(&s, hw_cache, PERF_COUNT_HW_CACHE_MAX);
377 	/*
378 	 * No fallback - if we cannot get a clear cache type
379 	 * then bail out:
380 	 */
381 	if (cache_type == -1)
382 		return EVT_FAILED;
383 
384 	while ((cache_op == -1 || cache_result == -1) && *s == '-') {
385 		++s;
386 
387 		if (cache_op == -1) {
388 			cache_op = parse_aliases(&s, hw_cache_op,
389 						PERF_COUNT_HW_CACHE_OP_MAX);
390 			if (cache_op >= 0) {
391 				if (!is_cache_op_valid(cache_type, cache_op))
392 					return 0;
393 				continue;
394 			}
395 		}
396 
397 		if (cache_result == -1) {
398 			cache_result = parse_aliases(&s, hw_cache_result,
399 						PERF_COUNT_HW_CACHE_RESULT_MAX);
400 			if (cache_result >= 0)
401 				continue;
402 		}
403 
404 		/*
405 		 * Can't parse this as a cache op or result, so back up
406 		 * to the '-'.
407 		 */
408 		--s;
409 		break;
410 	}
411 
412 	/*
413 	 * Fall back to reads:
414 	 */
415 	if (cache_op == -1)
416 		cache_op = PERF_COUNT_HW_CACHE_OP_READ;
417 
418 	/*
419 	 * Fall back to accesses:
420 	 */
421 	if (cache_result == -1)
422 		cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;
423 
424 	attr->config = cache_type | (cache_op << 8) | (cache_result << 16);
425 	attr->type = PERF_TYPE_HW_CACHE;
426 
427 	*str = s;
428 	return EVT_HANDLED;
429 }
430 
431 static enum event_result
parse_single_tracepoint_event(char * sys_name,const char * evt_name,unsigned int evt_length,struct perf_event_attr * attr,const char ** strp)432 parse_single_tracepoint_event(char *sys_name,
433 			      const char *evt_name,
434 			      unsigned int evt_length,
435 			      struct perf_event_attr *attr,
436 			      const char **strp)
437 {
438 	char evt_path[MAXPATHLEN];
439 	char id_buf[4];
440 	u64 id;
441 	int fd;
442 
443 	snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
444 		 sys_name, evt_name);
445 
446 	fd = open(evt_path, O_RDONLY);
447 	if (fd < 0)
448 		return EVT_FAILED;
449 
450 	if (read(fd, id_buf, sizeof(id_buf)) < 0) {
451 		close(fd);
452 		return EVT_FAILED;
453 	}
454 
455 	close(fd);
456 	id = atoll(id_buf);
457 	attr->config = id;
458 	attr->type = PERF_TYPE_TRACEPOINT;
459 	*strp += strlen(sys_name) + evt_length + 1; /* + 1 for the ':' */
460 
461 	attr->sample_type |= PERF_SAMPLE_RAW;
462 	attr->sample_type |= PERF_SAMPLE_TIME;
463 	attr->sample_type |= PERF_SAMPLE_CPU;
464 
465 	attr->sample_period = 1;
466 
467 
468 	return EVT_HANDLED;
469 }
470 
471 /* sys + ':' + event + ':' + flags*/
472 #define MAX_EVOPT_LEN	(MAX_EVENT_LENGTH * 2 + 2 + 128)
473 static enum event_result
parse_multiple_tracepoint_event(const struct option * opt,char * sys_name,const char * evt_exp,char * flags)474 parse_multiple_tracepoint_event(const struct option *opt, char *sys_name,
475 				const char *evt_exp, char *flags)
476 {
477 	char evt_path[MAXPATHLEN];
478 	struct dirent *evt_ent;
479 	DIR *evt_dir;
480 
481 	snprintf(evt_path, MAXPATHLEN, "%s/%s", debugfs_path, sys_name);
482 	evt_dir = opendir(evt_path);
483 
484 	if (!evt_dir) {
485 		perror("Can't open event dir");
486 		return EVT_FAILED;
487 	}
488 
489 	while ((evt_ent = readdir(evt_dir))) {
490 		char event_opt[MAX_EVOPT_LEN + 1];
491 		int len;
492 
493 		if (!strcmp(evt_ent->d_name, ".")
494 		    || !strcmp(evt_ent->d_name, "..")
495 		    || !strcmp(evt_ent->d_name, "enable")
496 		    || !strcmp(evt_ent->d_name, "filter"))
497 			continue;
498 
499 		if (!strglobmatch(evt_ent->d_name, evt_exp))
500 			continue;
501 
502 		len = snprintf(event_opt, MAX_EVOPT_LEN, "%s:%s%s%s", sys_name,
503 			       evt_ent->d_name, flags ? ":" : "",
504 			       flags ?: "");
505 		if (len < 0)
506 			return EVT_FAILED;
507 
508 		if (parse_events(opt, event_opt, 0))
509 			return EVT_FAILED;
510 	}
511 
512 	return EVT_HANDLED_ALL;
513 }
514 
515 static enum event_result
parse_tracepoint_event(const struct option * opt,const char ** strp,struct perf_event_attr * attr)516 parse_tracepoint_event(const struct option *opt, const char **strp,
517 		       struct perf_event_attr *attr)
518 {
519 	const char *evt_name;
520 	char *flags = NULL, *comma_loc;
521 	char sys_name[MAX_EVENT_LENGTH];
522 	unsigned int sys_length, evt_length;
523 
524 	if (debugfs_valid_mountpoint(debugfs_path))
525 		return 0;
526 
527 	evt_name = strchr(*strp, ':');
528 	if (!evt_name)
529 		return EVT_FAILED;
530 
531 	sys_length = evt_name - *strp;
532 	if (sys_length >= MAX_EVENT_LENGTH)
533 		return 0;
534 
535 	strncpy(sys_name, *strp, sys_length);
536 	sys_name[sys_length] = '\0';
537 	evt_name = evt_name + 1;
538 
539 	comma_loc = strchr(evt_name, ',');
540 	if (comma_loc) {
541 		/* take the event name up to the comma */
542 		evt_name = strndup(evt_name, comma_loc - evt_name);
543 	}
544 	flags = strchr(evt_name, ':');
545 	if (flags) {
546 		/* split it out: */
547 		evt_name = strndup(evt_name, flags - evt_name);
548 		flags++;
549 	}
550 
551 	evt_length = strlen(evt_name);
552 	if (evt_length >= MAX_EVENT_LENGTH)
553 		return EVT_FAILED;
554 	if (strpbrk(evt_name, "*?")) {
555 		*strp += strlen(sys_name) + evt_length + 1; /* 1 == the ':' */
556 		return parse_multiple_tracepoint_event(opt, sys_name, evt_name,
557 						       flags);
558 	} else {
559 		return parse_single_tracepoint_event(sys_name, evt_name,
560 						     evt_length, attr, strp);
561 	}
562 }
563 
564 static enum event_result
parse_breakpoint_type(const char * type,const char ** strp,struct perf_event_attr * attr)565 parse_breakpoint_type(const char *type, const char **strp,
566 		      struct perf_event_attr *attr)
567 {
568 	int i;
569 
570 	for (i = 0; i < 3; i++) {
571 		if (!type[i])
572 			break;
573 
574 		switch (type[i]) {
575 		case 'r':
576 			attr->bp_type |= HW_BREAKPOINT_R;
577 			break;
578 		case 'w':
579 			attr->bp_type |= HW_BREAKPOINT_W;
580 			break;
581 		case 'x':
582 			attr->bp_type |= HW_BREAKPOINT_X;
583 			break;
584 		default:
585 			return EVT_FAILED;
586 		}
587 	}
588 	if (!attr->bp_type) /* Default */
589 		attr->bp_type = HW_BREAKPOINT_R | HW_BREAKPOINT_W;
590 
591 	*strp = type + i;
592 
593 	return EVT_HANDLED;
594 }
595 
596 static enum event_result
parse_breakpoint_event(const char ** strp,struct perf_event_attr * attr)597 parse_breakpoint_event(const char **strp, struct perf_event_attr *attr)
598 {
599 	const char *target;
600 	const char *type;
601 	char *endaddr;
602 	u64 addr;
603 	enum event_result err;
604 
605 	target = strchr(*strp, ':');
606 	if (!target)
607 		return EVT_FAILED;
608 
609 	if (strncmp(*strp, "mem", target - *strp) != 0)
610 		return EVT_FAILED;
611 
612 	target++;
613 
614 	addr = strtoull(target, &endaddr, 0);
615 	if (target == endaddr)
616 		return EVT_FAILED;
617 
618 	attr->bp_addr = addr;
619 	*strp = endaddr;
620 
621 	type = strchr(target, ':');
622 
623 	/* If no type is defined, just rw as default */
624 	if (!type) {
625 		attr->bp_type = HW_BREAKPOINT_R | HW_BREAKPOINT_W;
626 	} else {
627 		err = parse_breakpoint_type(++type, strp, attr);
628 		if (err == EVT_FAILED)
629 			return EVT_FAILED;
630 	}
631 
632 	/*
633 	 * We should find a nice way to override the access length
634 	 * Provide some defaults for now
635 	 */
636 	if (attr->bp_type == HW_BREAKPOINT_X)
637 		attr->bp_len = sizeof(long);
638 	else
639 		attr->bp_len = HW_BREAKPOINT_LEN_4;
640 
641 	attr->type = PERF_TYPE_BREAKPOINT;
642 
643 	return EVT_HANDLED;
644 }
645 
check_events(const char * str,unsigned int i)646 static int check_events(const char *str, unsigned int i)
647 {
648 	int n;
649 
650 	n = strlen(event_symbols[i].symbol);
651 	if (!strncmp(str, event_symbols[i].symbol, n))
652 		return n;
653 
654 	n = strlen(event_symbols[i].alias);
655 	if (n)
656 		if (!strncmp(str, event_symbols[i].alias, n))
657 			return n;
658 	return 0;
659 }
660 
661 static enum event_result
parse_symbolic_event(const char ** strp,struct perf_event_attr * attr)662 parse_symbolic_event(const char **strp, struct perf_event_attr *attr)
663 {
664 	const char *str = *strp;
665 	unsigned int i;
666 	int n;
667 
668 	for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
669 		n = check_events(str, i);
670 		if (n > 0) {
671 			attr->type = event_symbols[i].type;
672 			attr->config = event_symbols[i].config;
673 			*strp = str + n;
674 			return EVT_HANDLED;
675 		}
676 	}
677 	return EVT_FAILED;
678 }
679 
680 static enum event_result
parse_raw_event(const char ** strp,struct perf_event_attr * attr)681 parse_raw_event(const char **strp, struct perf_event_attr *attr)
682 {
683 	const char *str = *strp;
684 	u64 config;
685 	int n;
686 
687 	if (*str != 'r')
688 		return EVT_FAILED;
689 	n = hex2u64(str + 1, &config);
690 	if (n > 0) {
691 		*strp = str + n + 1;
692 		attr->type = PERF_TYPE_RAW;
693 		attr->config = config;
694 		return EVT_HANDLED;
695 	}
696 	return EVT_FAILED;
697 }
698 
699 static enum event_result
parse_numeric_event(const char ** strp,struct perf_event_attr * attr)700 parse_numeric_event(const char **strp, struct perf_event_attr *attr)
701 {
702 	const char *str = *strp;
703 	char *endp;
704 	unsigned long type;
705 	u64 config;
706 
707 	type = strtoul(str, &endp, 0);
708 	if (endp > str && type < PERF_TYPE_MAX && *endp == ':') {
709 		str = endp + 1;
710 		config = strtoul(str, &endp, 0);
711 		if (endp > str) {
712 			attr->type = type;
713 			attr->config = config;
714 			*strp = endp;
715 			return EVT_HANDLED;
716 		}
717 	}
718 	return EVT_FAILED;
719 }
720 
721 static enum event_result
parse_event_modifier(const char ** strp,struct perf_event_attr * attr)722 parse_event_modifier(const char **strp, struct perf_event_attr *attr)
723 {
724 	const char *str = *strp;
725 	int exclude = 0;
726 	int eu = 0, ek = 0, eh = 0, precise = 0;
727 
728 	if (*str++ != ':')
729 		return 0;
730 	while (*str) {
731 		if (*str == 'u') {
732 			if (!exclude)
733 				exclude = eu = ek = eh = 1;
734 			eu = 0;
735 		} else if (*str == 'k') {
736 			if (!exclude)
737 				exclude = eu = ek = eh = 1;
738 			ek = 0;
739 		} else if (*str == 'h') {
740 			if (!exclude)
741 				exclude = eu = ek = eh = 1;
742 			eh = 0;
743 		} else if (*str == 'p') {
744 			precise++;
745 		} else
746 			break;
747 
748 		++str;
749 	}
750 	if (str >= *strp + 2) {
751 		*strp = str;
752 		attr->exclude_user   = eu;
753 		attr->exclude_kernel = ek;
754 		attr->exclude_hv     = eh;
755 		attr->precise_ip     = precise;
756 		return 1;
757 	}
758 	return 0;
759 }
760 
761 /*
762  * Each event can have multiple symbolic names.
763  * Symbolic names are (almost) exactly matched.
764  */
765 static enum event_result
parse_event_symbols(const struct option * opt,const char ** str,struct perf_event_attr * attr)766 parse_event_symbols(const struct option *opt, const char **str,
767 		    struct perf_event_attr *attr)
768 {
769 	enum event_result ret;
770 
771 	ret = parse_tracepoint_event(opt, str, attr);
772 	if (ret != EVT_FAILED)
773 		goto modifier;
774 
775 	ret = parse_raw_event(str, attr);
776 	if (ret != EVT_FAILED)
777 		goto modifier;
778 
779 	ret = parse_numeric_event(str, attr);
780 	if (ret != EVT_FAILED)
781 		goto modifier;
782 
783 	ret = parse_symbolic_event(str, attr);
784 	if (ret != EVT_FAILED)
785 		goto modifier;
786 
787 	ret = parse_generic_hw_event(str, attr);
788 	if (ret != EVT_FAILED)
789 		goto modifier;
790 
791 	ret = parse_breakpoint_event(str, attr);
792 	if (ret != EVT_FAILED)
793 		goto modifier;
794 
795 	fprintf(stderr, "invalid or unsupported event: '%s'\n", *str);
796 	fprintf(stderr, "Run 'perf list' for a list of valid events\n");
797 	return EVT_FAILED;
798 
799 modifier:
800 	parse_event_modifier(str, attr);
801 
802 	return ret;
803 }
804 
parse_events(const struct option * opt,const char * str,int unset __used)805 int parse_events(const struct option *opt, const char *str, int unset __used)
806 {
807 	struct perf_evlist *evlist = *(struct perf_evlist **)opt->value;
808 	struct perf_event_attr attr;
809 	enum event_result ret;
810 	const char *ostr;
811 
812 	for (;;) {
813 		ostr = str;
814 		memset(&attr, 0, sizeof(attr));
815 		ret = parse_event_symbols(opt, &str, &attr);
816 		if (ret == EVT_FAILED)
817 			return -1;
818 
819 		if (!(*str == 0 || *str == ',' || isspace(*str)))
820 			return -1;
821 
822 		if (ret != EVT_HANDLED_ALL) {
823 			struct perf_evsel *evsel;
824 			evsel = perf_evsel__new(&attr, evlist->nr_entries);
825 			if (evsel == NULL)
826 				return -1;
827 			perf_evlist__add(evlist, evsel);
828 
829 			evsel->name = calloc(str - ostr + 1, 1);
830 			if (!evsel->name)
831 				return -1;
832 			strncpy(evsel->name, ostr, str - ostr);
833 		}
834 
835 		if (*str == 0)
836 			break;
837 		if (*str == ',')
838 			++str;
839 		while (isspace(*str))
840 			++str;
841 	}
842 
843 	return 0;
844 }
845 
parse_filter(const struct option * opt,const char * str,int unset __used)846 int parse_filter(const struct option *opt, const char *str,
847 		 int unset __used)
848 {
849 	struct perf_evlist *evlist = *(struct perf_evlist **)opt->value;
850 	struct perf_evsel *last = NULL;
851 
852 	if (evlist->nr_entries > 0)
853 		last = list_entry(evlist->entries.prev, struct perf_evsel, node);
854 
855 	if (last == NULL || last->attr.type != PERF_TYPE_TRACEPOINT) {
856 		fprintf(stderr,
857 			"-F option should follow a -e tracepoint option\n");
858 		return -1;
859 	}
860 
861 	last->filter = strdup(str);
862 	if (last->filter == NULL) {
863 		fprintf(stderr, "not enough memory to hold filter string\n");
864 		return -1;
865 	}
866 
867 	return 0;
868 }
869 
870 static const char * const event_type_descriptors[] = {
871 	"Hardware event",
872 	"Software event",
873 	"Tracepoint event",
874 	"Hardware cache event",
875 	"Raw hardware event descriptor",
876 	"Hardware breakpoint",
877 };
878 
879 /*
880  * Print the events from <debugfs_mount_point>/tracing/events
881  */
882 
print_tracepoint_events(const char * subsys_glob,const char * event_glob)883 void print_tracepoint_events(const char *subsys_glob, const char *event_glob)
884 {
885 	DIR *sys_dir, *evt_dir;
886 	struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
887 	char evt_path[MAXPATHLEN];
888 	char dir_path[MAXPATHLEN];
889 
890 	if (debugfs_valid_mountpoint(debugfs_path))
891 		return;
892 
893 	sys_dir = opendir(debugfs_path);
894 	if (!sys_dir)
895 		return;
896 
897 	for_each_subsystem(sys_dir, sys_dirent, sys_next) {
898 		if (subsys_glob != NULL &&
899 		    !strglobmatch(sys_dirent.d_name, subsys_glob))
900 			continue;
901 
902 		snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
903 			 sys_dirent.d_name);
904 		evt_dir = opendir(dir_path);
905 		if (!evt_dir)
906 			continue;
907 
908 		for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
909 			if (event_glob != NULL &&
910 			    !strglobmatch(evt_dirent.d_name, event_glob))
911 				continue;
912 
913 			snprintf(evt_path, MAXPATHLEN, "%s:%s",
914 				 sys_dirent.d_name, evt_dirent.d_name);
915 			printf("  %-42s [%s]\n", evt_path,
916 				event_type_descriptors[PERF_TYPE_TRACEPOINT]);
917 		}
918 		closedir(evt_dir);
919 	}
920 	closedir(sys_dir);
921 }
922 
923 /*
924  * Check whether event is in <debugfs_mount_point>/tracing/events
925  */
926 
is_valid_tracepoint(const char * event_string)927 int is_valid_tracepoint(const char *event_string)
928 {
929 	DIR *sys_dir, *evt_dir;
930 	struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
931 	char evt_path[MAXPATHLEN];
932 	char dir_path[MAXPATHLEN];
933 
934 	if (debugfs_valid_mountpoint(debugfs_path))
935 		return 0;
936 
937 	sys_dir = opendir(debugfs_path);
938 	if (!sys_dir)
939 		return 0;
940 
941 	for_each_subsystem(sys_dir, sys_dirent, sys_next) {
942 
943 		snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
944 			 sys_dirent.d_name);
945 		evt_dir = opendir(dir_path);
946 		if (!evt_dir)
947 			continue;
948 
949 		for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
950 			snprintf(evt_path, MAXPATHLEN, "%s:%s",
951 				 sys_dirent.d_name, evt_dirent.d_name);
952 			if (!strcmp(evt_path, event_string)) {
953 				closedir(evt_dir);
954 				closedir(sys_dir);
955 				return 1;
956 			}
957 		}
958 		closedir(evt_dir);
959 	}
960 	closedir(sys_dir);
961 	return 0;
962 }
963 
print_events_type(u8 type)964 void print_events_type(u8 type)
965 {
966 	struct event_symbol *syms = event_symbols;
967 	unsigned int i;
968 	char name[64];
969 
970 	for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
971 		if (type != syms->type)
972 			continue;
973 
974 		if (strlen(syms->alias))
975 			snprintf(name, sizeof(name),  "%s OR %s",
976 				 syms->symbol, syms->alias);
977 		else
978 			snprintf(name, sizeof(name), "%s", syms->symbol);
979 
980 		printf("  %-42s [%s]\n", name,
981 			event_type_descriptors[type]);
982 	}
983 }
984 
print_hwcache_events(const char * event_glob)985 int print_hwcache_events(const char *event_glob)
986 {
987 	unsigned int type, op, i, printed = 0;
988 
989 	for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
990 		for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
991 			/* skip invalid cache type */
992 			if (!is_cache_op_valid(type, op))
993 				continue;
994 
995 			for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
996 				char *name = event_cache_name(type, op, i);
997 
998 				if (event_glob != NULL &&
999 				    !strglobmatch(name, event_glob))
1000 					continue;
1001 
1002 				printf("  %-42s [%s]\n", name,
1003 					event_type_descriptors[PERF_TYPE_HW_CACHE]);
1004 				++printed;
1005 			}
1006 		}
1007 	}
1008 
1009 	return printed;
1010 }
1011 
1012 /*
1013  * Print the help text for the event symbols:
1014  */
print_events(const char * event_glob)1015 void print_events(const char *event_glob)
1016 {
1017 	struct event_symbol *syms = event_symbols;
1018 	unsigned int i, type, prev_type = -1, printed = 0, ntypes_printed = 0;
1019 	char name[40];
1020 
1021 	printf("\n");
1022 	printf("List of pre-defined events (to be used in -e):\n");
1023 
1024 	for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
1025 		type = syms->type;
1026 
1027 		if (type != prev_type && printed) {
1028 			printf("\n");
1029 			printed = 0;
1030 			ntypes_printed++;
1031 		}
1032 
1033 		if (event_glob != NULL &&
1034 		    !(strglobmatch(syms->symbol, event_glob) ||
1035 		      (syms->alias && strglobmatch(syms->alias, event_glob))))
1036 			continue;
1037 
1038 		if (strlen(syms->alias))
1039 			sprintf(name, "%s OR %s", syms->symbol, syms->alias);
1040 		else
1041 			strcpy(name, syms->symbol);
1042 		printf("  %-42s [%s]\n", name,
1043 			event_type_descriptors[type]);
1044 
1045 		prev_type = type;
1046 		++printed;
1047 	}
1048 
1049 	if (ntypes_printed) {
1050 		printed = 0;
1051 		printf("\n");
1052 	}
1053 	print_hwcache_events(event_glob);
1054 
1055 	if (event_glob != NULL)
1056 		return;
1057 
1058 	printf("\n");
1059 	printf("  %-42s [%s]\n",
1060 		"rNNN (see 'perf list --help' on how to encode it)",
1061 	       event_type_descriptors[PERF_TYPE_RAW]);
1062 	printf("\n");
1063 
1064 	printf("  %-42s [%s]\n",
1065 			"mem:<addr>[:access]",
1066 			event_type_descriptors[PERF_TYPE_BREAKPOINT]);
1067 	printf("\n");
1068 
1069 	print_tracepoint_events(NULL, NULL);
1070 
1071 	exit(129);
1072 }
1073