13ab4b842d49ba30f4e74a0854e9cf30fc21c2a6
[pandora-kernel.git] / tools / perf / util / parse-events.c
1
2 #include "util.h"
3 #include "../perf.h"
4 #include "parse-options.h"
5 #include "parse-events.h"
6 #include "exec_cmd.h"
7 #include "string.h"
8 #include "cache.h"
9 #include "header.h"
10
11 int                                     nr_counters;
12
13 struct perf_event_attr          attrs[MAX_COUNTERS];
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 };
50
51 #define __PERF_EVENT_FIELD(config, name) \
52         ((config & PERF_EVENT_##name##_MASK) >> PERF_EVENT_##name##_SHIFT)
53
54 #define PERF_EVENT_RAW(config)  __PERF_EVENT_FIELD(config, RAW)
55 #define PERF_EVENT_CONFIG(config)       __PERF_EVENT_FIELD(config, CONFIG)
56 #define PERF_EVENT_TYPE(config) __PERF_EVENT_FIELD(config, TYPE)
57 #define PERF_EVENT_ID(config)           __PERF_EVENT_FIELD(config, EVENT)
58
59 static const char *hw_event_names[] = {
60         "cycles",
61         "instructions",
62         "cache-references",
63         "cache-misses",
64         "branches",
65         "branch-misses",
66         "bus-cycles",
67 };
68
69 static const char *sw_event_names[] = {
70         "cpu-clock-msecs",
71         "task-clock-msecs",
72         "page-faults",
73         "context-switches",
74         "CPU-migrations",
75         "minor-faults",
76         "major-faults",
77 };
78
79 #define MAX_ALIASES 8
80
81 static const char *hw_cache[][MAX_ALIASES] = {
82  { "L1-dcache", "l1-d",         "l1d",          "L1-data",              },
83  { "L1-icache", "l1-i",         "l1i",          "L1-instruction",       },
84  { "LLC",       "L2"                                                    },
85  { "dTLB",      "d-tlb",        "Data-TLB",                             },
86  { "iTLB",      "i-tlb",        "Instruction-TLB",                      },
87  { "branch",    "branches",     "bpu",          "btb",          "bpc",  },
88 };
89
90 static const char *hw_cache_op[][MAX_ALIASES] = {
91  { "load",      "loads",        "read",                                 },
92  { "store",     "stores",       "write",                                },
93  { "prefetch",  "prefetches",   "speculative-read", "speculative-load", },
94 };
95
96 static const char *hw_cache_result[][MAX_ALIASES] = {
97  { "refs",      "Reference",    "ops",          "access",               },
98  { "misses",    "miss",                                                 },
99 };
100
101 #define C(x)            PERF_COUNT_HW_CACHE_##x
102 #define CACHE_READ      (1 << C(OP_READ))
103 #define CACHE_WRITE     (1 << C(OP_WRITE))
104 #define CACHE_PREFETCH  (1 << C(OP_PREFETCH))
105 #define COP(x)          (1 << x)
106
107 /*
108  * cache operartion stat
109  * L1I : Read and prefetch only
110  * ITLB and BPU : Read-only
111  */
112 static unsigned long hw_cache_stat[C(MAX)] = {
113  [C(L1D)]       = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
114  [C(L1I)]       = (CACHE_READ | CACHE_PREFETCH),
115  [C(LL)]        = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
116  [C(DTLB)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
117  [C(ITLB)]      = (CACHE_READ),
118  [C(BPU)]       = (CACHE_READ),
119 };
120
121 #define for_each_subsystem(sys_dir, sys_dirent, sys_next)              \
122         while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next)        \
123         if (sys_dirent.d_type == DT_DIR &&                                     \
124            (strcmp(sys_dirent.d_name, ".")) &&                                 \
125            (strcmp(sys_dirent.d_name, "..")))
126
127 static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
128 {
129         char evt_path[MAXPATHLEN];
130         int fd;
131
132         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
133                         sys_dir->d_name, evt_dir->d_name);
134         fd = open(evt_path, O_RDONLY);
135         if (fd < 0)
136                 return -EINVAL;
137         close(fd);
138
139         return 0;
140 }
141
142 #define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next)              \
143         while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next)        \
144         if (evt_dirent.d_type == DT_DIR &&                                     \
145            (strcmp(evt_dirent.d_name, ".")) &&                                 \
146            (strcmp(evt_dirent.d_name, "..")) &&                                \
147            (!tp_event_has_id(&sys_dirent, &evt_dirent)))
148
149 #define MAX_EVENT_LENGTH 512
150
151 int valid_debugfs_mount(const char *debugfs)
152 {
153         struct statfs st_fs;
154
155         if (statfs(debugfs, &st_fs) < 0)
156                 return -ENOENT;
157         else if (st_fs.f_type != (long) DEBUGFS_MAGIC)
158                 return -ENOENT;
159         return 0;
160 }
161
162 struct tracepoint_path *tracepoint_id_to_path(u64 config)
163 {
164         struct tracepoint_path *path = NULL;
165         DIR *sys_dir, *evt_dir;
166         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
167         char id_buf[4];
168         int sys_dir_fd, fd;
169         u64 id;
170         char evt_path[MAXPATHLEN];
171
172         if (valid_debugfs_mount(debugfs_path))
173                 return NULL;
174
175         sys_dir = opendir(debugfs_path);
176         if (!sys_dir)
177                 goto cleanup;
178         sys_dir_fd = dirfd(sys_dir);
179
180         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
181                 int dfd = openat(sys_dir_fd, sys_dirent.d_name,
182                                  O_RDONLY|O_DIRECTORY), evt_dir_fd;
183                 if (dfd == -1)
184                         continue;
185                 evt_dir = fdopendir(dfd);
186                 if (!evt_dir) {
187                         close(dfd);
188                         continue;
189                 }
190                 evt_dir_fd = dirfd(evt_dir);
191                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
192                         snprintf(evt_path, MAXPATHLEN, "%s/id",
193                                  evt_dirent.d_name);
194                         fd = openat(evt_dir_fd, evt_path, O_RDONLY);
195                         if (fd < 0)
196                                 continue;
197                         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
198                                 close(fd);
199                                 continue;
200                         }
201                         close(fd);
202                         id = atoll(id_buf);
203                         if (id == config) {
204                                 closedir(evt_dir);
205                                 closedir(sys_dir);
206                                 path = calloc(1, sizeof(path));
207                                 path->system = malloc(MAX_EVENT_LENGTH);
208                                 if (!path->system) {
209                                         free(path);
210                                         return NULL;
211                                 }
212                                 path->name = malloc(MAX_EVENT_LENGTH);
213                                 if (!path->name) {
214                                         free(path->system);
215                                         free(path);
216                                         return NULL;
217                                 }
218                                 strncpy(path->system, sys_dirent.d_name,
219                                         MAX_EVENT_LENGTH);
220                                 strncpy(path->name, evt_dirent.d_name,
221                                         MAX_EVENT_LENGTH);
222                                 return path;
223                         }
224                 }
225                 closedir(evt_dir);
226         }
227
228 cleanup:
229         closedir(sys_dir);
230         return NULL;
231 }
232
233 #define TP_PATH_LEN (MAX_EVENT_LENGTH * 2 + 1)
234 static const char *tracepoint_id_to_name(u64 config)
235 {
236         static char buf[TP_PATH_LEN];
237         struct tracepoint_path *path;
238
239         path = tracepoint_id_to_path(config);
240         if (path) {
241                 snprintf(buf, TP_PATH_LEN, "%s:%s", path->system, path->name);
242                 free(path->name);
243                 free(path->system);
244                 free(path);
245         } else
246                 snprintf(buf, TP_PATH_LEN, "%s:%s", "unknown", "unknown");
247
248         return buf;
249 }
250
251 static int is_cache_op_valid(u8 cache_type, u8 cache_op)
252 {
253         if (hw_cache_stat[cache_type] & COP(cache_op))
254                 return 1;       /* valid */
255         else
256                 return 0;       /* invalid */
257 }
258
259 static char *event_cache_name(u8 cache_type, u8 cache_op, u8 cache_result)
260 {
261         static char name[50];
262
263         if (cache_result) {
264                 sprintf(name, "%s-%s-%s", hw_cache[cache_type][0],
265                         hw_cache_op[cache_op][0],
266                         hw_cache_result[cache_result][0]);
267         } else {
268                 sprintf(name, "%s-%s", hw_cache[cache_type][0],
269                         hw_cache_op[cache_op][1]);
270         }
271
272         return name;
273 }
274
275 const char *event_name(int counter)
276 {
277         u64 config = attrs[counter].config;
278         int type = attrs[counter].type;
279
280         return __event_name(type, config);
281 }
282
283 const char *__event_name(int type, u64 config)
284 {
285         static char buf[32];
286
287         if (type == PERF_TYPE_RAW) {
288                 sprintf(buf, "raw 0x%llx", config);
289                 return buf;
290         }
291
292         switch (type) {
293         case PERF_TYPE_HARDWARE:
294                 if (config < PERF_COUNT_HW_MAX)
295                         return hw_event_names[config];
296                 return "unknown-hardware";
297
298         case PERF_TYPE_HW_CACHE: {
299                 u8 cache_type, cache_op, cache_result;
300
301                 cache_type   = (config >>  0) & 0xff;
302                 if (cache_type > PERF_COUNT_HW_CACHE_MAX)
303                         return "unknown-ext-hardware-cache-type";
304
305                 cache_op     = (config >>  8) & 0xff;
306                 if (cache_op > PERF_COUNT_HW_CACHE_OP_MAX)
307                         return "unknown-ext-hardware-cache-op";
308
309                 cache_result = (config >> 16) & 0xff;
310                 if (cache_result > PERF_COUNT_HW_CACHE_RESULT_MAX)
311                         return "unknown-ext-hardware-cache-result";
312
313                 if (!is_cache_op_valid(cache_type, cache_op))
314                         return "invalid-cache";
315
316                 return event_cache_name(cache_type, cache_op, cache_result);
317         }
318
319         case PERF_TYPE_SOFTWARE:
320                 if (config < PERF_COUNT_SW_MAX)
321                         return sw_event_names[config];
322                 return "unknown-software";
323
324         case PERF_TYPE_TRACEPOINT:
325                 return tracepoint_id_to_name(config);
326
327         default:
328                 break;
329         }
330
331         return "unknown";
332 }
333
334 static int parse_aliases(const char **str, const char *names[][MAX_ALIASES], int size)
335 {
336         int i, j;
337         int n, longest = -1;
338
339         for (i = 0; i < size; i++) {
340                 for (j = 0; j < MAX_ALIASES && names[i][j]; j++) {
341                         n = strlen(names[i][j]);
342                         if (n > longest && !strncasecmp(*str, names[i][j], n))
343                                 longest = n;
344                 }
345                 if (longest > 0) {
346                         *str += longest;
347                         return i;
348                 }
349         }
350
351         return -1;
352 }
353
354 static enum event_result
355 parse_generic_hw_event(const char **str, struct perf_event_attr *attr)
356 {
357         const char *s = *str;
358         int cache_type = -1, cache_op = -1, cache_result = -1;
359
360         cache_type = parse_aliases(&s, hw_cache, PERF_COUNT_HW_CACHE_MAX);
361         /*
362          * No fallback - if we cannot get a clear cache type
363          * then bail out:
364          */
365         if (cache_type == -1)
366                 return EVT_FAILED;
367
368         while ((cache_op == -1 || cache_result == -1) && *s == '-') {
369                 ++s;
370
371                 if (cache_op == -1) {
372                         cache_op = parse_aliases(&s, hw_cache_op,
373                                                 PERF_COUNT_HW_CACHE_OP_MAX);
374                         if (cache_op >= 0) {
375                                 if (!is_cache_op_valid(cache_type, cache_op))
376                                         return 0;
377                                 continue;
378                         }
379                 }
380
381                 if (cache_result == -1) {
382                         cache_result = parse_aliases(&s, hw_cache_result,
383                                                 PERF_COUNT_HW_CACHE_RESULT_MAX);
384                         if (cache_result >= 0)
385                                 continue;
386                 }
387
388                 /*
389                  * Can't parse this as a cache op or result, so back up
390                  * to the '-'.
391                  */
392                 --s;
393                 break;
394         }
395
396         /*
397          * Fall back to reads:
398          */
399         if (cache_op == -1)
400                 cache_op = PERF_COUNT_HW_CACHE_OP_READ;
401
402         /*
403          * Fall back to accesses:
404          */
405         if (cache_result == -1)
406                 cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;
407
408         attr->config = cache_type | (cache_op << 8) | (cache_result << 16);
409         attr->type = PERF_TYPE_HW_CACHE;
410
411         *str = s;
412         return EVT_HANDLED;
413 }
414
415 static enum event_result
416 parse_single_tracepoint_event(char *sys_name,
417                               const char *evt_name,
418                               unsigned int evt_length,
419                               char *flags,
420                               struct perf_event_attr *attr,
421                               const char **strp)
422 {
423         char evt_path[MAXPATHLEN];
424         char id_buf[4];
425         u64 id;
426         int fd;
427
428         if (flags) {
429                 if (!strncmp(flags, "record", strlen(flags))) {
430                         attr->sample_type |= PERF_SAMPLE_RAW;
431                         attr->sample_type |= PERF_SAMPLE_TIME;
432                         attr->sample_type |= PERF_SAMPLE_CPU;
433                 }
434         }
435
436         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
437                  sys_name, evt_name);
438
439         fd = open(evt_path, O_RDONLY);
440         if (fd < 0)
441                 return EVT_FAILED;
442
443         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
444                 close(fd);
445                 return EVT_FAILED;
446         }
447
448         close(fd);
449         id = atoll(id_buf);
450         attr->config = id;
451         attr->type = PERF_TYPE_TRACEPOINT;
452         *strp = evt_name + evt_length;
453
454         return EVT_HANDLED;
455 }
456
457 /* sys + ':' + event + ':' + flags*/
458 #define MAX_EVOPT_LEN   (MAX_EVENT_LENGTH * 2 + 2 + 128)
459 static enum event_result
460 parse_subsystem_tracepoint_event(char *sys_name, char *flags)
461 {
462         char evt_path[MAXPATHLEN];
463         struct dirent *evt_ent;
464         DIR *evt_dir;
465
466         snprintf(evt_path, MAXPATHLEN, "%s/%s", debugfs_path, sys_name);
467         evt_dir = opendir(evt_path);
468
469         if (!evt_dir) {
470                 perror("Can't open event dir");
471                 return EVT_FAILED;
472         }
473
474         while ((evt_ent = readdir(evt_dir))) {
475                 char event_opt[MAX_EVOPT_LEN + 1];
476                 int len;
477                 unsigned int rem = MAX_EVOPT_LEN;
478
479                 if (!strcmp(evt_ent->d_name, ".")
480                     || !strcmp(evt_ent->d_name, "..")
481                     || !strcmp(evt_ent->d_name, "enable")
482                     || !strcmp(evt_ent->d_name, "filter"))
483                         continue;
484
485                 len = snprintf(event_opt, MAX_EVOPT_LEN, "%s:%s", sys_name,
486                                evt_ent->d_name);
487                 if (len < 0)
488                         return EVT_FAILED;
489
490                 rem -= len;
491                 if (flags) {
492                         if (rem < strlen(flags) + 1)
493                                 return EVT_FAILED;
494
495                         strcat(event_opt, ":");
496                         strcat(event_opt, flags);
497                 }
498
499                 if (parse_events(NULL, event_opt, 0))
500                         return EVT_FAILED;
501         }
502
503         return EVT_HANDLED_ALL;
504 }
505
506
507 static enum event_result parse_tracepoint_event(const char **strp,
508                                     struct perf_event_attr *attr)
509 {
510         const char *evt_name;
511         char *flags;
512         char sys_name[MAX_EVENT_LENGTH];
513         unsigned int sys_length, evt_length;
514
515         if (valid_debugfs_mount(debugfs_path))
516                 return 0;
517
518         evt_name = strchr(*strp, ':');
519         if (!evt_name)
520                 return EVT_FAILED;
521
522         sys_length = evt_name - *strp;
523         if (sys_length >= MAX_EVENT_LENGTH)
524                 return 0;
525
526         strncpy(sys_name, *strp, sys_length);
527         sys_name[sys_length] = '\0';
528         evt_name = evt_name + 1;
529
530         flags = strchr(evt_name, ':');
531         if (flags) {
532                 /* split it out: */
533                 evt_name = strndup(evt_name, flags - evt_name);
534                 flags++;
535         }
536
537         evt_length = strlen(evt_name);
538         if (evt_length >= MAX_EVENT_LENGTH)
539                 return EVT_FAILED;
540
541         if (!strcmp(evt_name, "*")) {
542                 *strp = evt_name + evt_length;
543                 return parse_subsystem_tracepoint_event(sys_name, flags);
544         } else
545                 return parse_single_tracepoint_event(sys_name, evt_name,
546                                                      evt_length, flags,
547                                                      attr, strp);
548 }
549
550 static int check_events(const char *str, unsigned int i)
551 {
552         int n;
553
554         n = strlen(event_symbols[i].symbol);
555         if (!strncmp(str, event_symbols[i].symbol, n))
556                 return n;
557
558         n = strlen(event_symbols[i].alias);
559         if (n)
560                 if (!strncmp(str, event_symbols[i].alias, n))
561                         return n;
562         return 0;
563 }
564
565 static enum event_result
566 parse_symbolic_event(const char **strp, struct perf_event_attr *attr)
567 {
568         const char *str = *strp;
569         unsigned int i;
570         int n;
571
572         for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
573                 n = check_events(str, i);
574                 if (n > 0) {
575                         attr->type = event_symbols[i].type;
576                         attr->config = event_symbols[i].config;
577                         *strp = str + n;
578                         return EVT_HANDLED;
579                 }
580         }
581         return EVT_FAILED;
582 }
583
584 static enum event_result
585 parse_raw_event(const char **strp, struct perf_event_attr *attr)
586 {
587         const char *str = *strp;
588         u64 config;
589         int n;
590
591         if (*str != 'r')
592                 return EVT_FAILED;
593         n = hex2u64(str + 1, &config);
594         if (n > 0) {
595                 *strp = str + n + 1;
596                 attr->type = PERF_TYPE_RAW;
597                 attr->config = config;
598                 return EVT_HANDLED;
599         }
600         return EVT_FAILED;
601 }
602
603 static enum event_result
604 parse_numeric_event(const char **strp, struct perf_event_attr *attr)
605 {
606         const char *str = *strp;
607         char *endp;
608         unsigned long type;
609         u64 config;
610
611         type = strtoul(str, &endp, 0);
612         if (endp > str && type < PERF_TYPE_MAX && *endp == ':') {
613                 str = endp + 1;
614                 config = strtoul(str, &endp, 0);
615                 if (endp > str) {
616                         attr->type = type;
617                         attr->config = config;
618                         *strp = endp;
619                         return EVT_HANDLED;
620                 }
621         }
622         return EVT_FAILED;
623 }
624
625 static enum event_result
626 parse_event_modifier(const char **strp, struct perf_event_attr *attr)
627 {
628         const char *str = *strp;
629         int eu = 1, ek = 1, eh = 1;
630
631         if (*str++ != ':')
632                 return 0;
633         while (*str) {
634                 if (*str == 'u')
635                         eu = 0;
636                 else if (*str == 'k')
637                         ek = 0;
638                 else if (*str == 'h')
639                         eh = 0;
640                 else
641                         break;
642                 ++str;
643         }
644         if (str >= *strp + 2) {
645                 *strp = str;
646                 attr->exclude_user   = eu;
647                 attr->exclude_kernel = ek;
648                 attr->exclude_hv     = eh;
649                 return 1;
650         }
651         return 0;
652 }
653
654 /*
655  * Each event can have multiple symbolic names.
656  * Symbolic names are (almost) exactly matched.
657  */
658 static enum event_result
659 parse_event_symbols(const char **str, struct perf_event_attr *attr)
660 {
661         enum event_result ret;
662
663         ret = parse_tracepoint_event(str, attr);
664         if (ret != EVT_FAILED)
665                 goto modifier;
666
667         ret = parse_raw_event(str, attr);
668         if (ret != EVT_FAILED)
669                 goto modifier;
670
671         ret = parse_numeric_event(str, attr);
672         if (ret != EVT_FAILED)
673                 goto modifier;
674
675         ret = parse_symbolic_event(str, attr);
676         if (ret != EVT_FAILED)
677                 goto modifier;
678
679         ret = parse_generic_hw_event(str, attr);
680         if (ret != EVT_FAILED)
681                 goto modifier;
682
683         return EVT_FAILED;
684
685 modifier:
686         parse_event_modifier(str, attr);
687
688         return ret;
689 }
690
691 static void store_event_type(const char *orgname)
692 {
693         char filename[PATH_MAX], *c;
694         FILE *file;
695         int id;
696
697         sprintf(filename, "/sys/kernel/debug/tracing/events/%s/id", orgname);
698         c = strchr(filename, ':');
699         if (c)
700                 *c = '/';
701
702         file = fopen(filename, "r");
703         if (!file)
704                 return;
705         if (fscanf(file, "%i", &id) < 1)
706                 die("cannot store event ID");
707         fclose(file);
708         perf_header__push_event(id, orgname);
709 }
710
711
712 int parse_events(const struct option *opt __used, const char *str, int unset __used)
713 {
714         struct perf_event_attr attr;
715         enum event_result ret;
716
717         if (strchr(str, ':'))
718                 store_event_type(str);
719
720         for (;;) {
721                 if (nr_counters == MAX_COUNTERS)
722                         return -1;
723
724                 memset(&attr, 0, sizeof(attr));
725                 ret = parse_event_symbols(&str, &attr);
726                 if (ret == EVT_FAILED)
727                         return -1;
728
729                 if (!(*str == 0 || *str == ',' || isspace(*str)))
730                         return -1;
731
732                 if (ret != EVT_HANDLED_ALL) {
733                         attrs[nr_counters] = attr;
734                         nr_counters++;
735                 }
736
737                 if (*str == 0)
738                         break;
739                 if (*str == ',')
740                         ++str;
741                 while (isspace(*str))
742                         ++str;
743         }
744
745         return 0;
746 }
747
748 static const char * const event_type_descriptors[] = {
749         "",
750         "Hardware event",
751         "Software event",
752         "Tracepoint event",
753         "Hardware cache event",
754 };
755
756 /*
757  * Print the events from <debugfs_mount_point>/tracing/events
758  */
759
760 static void print_tracepoint_events(void)
761 {
762         DIR *sys_dir, *evt_dir;
763         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
764         int sys_dir_fd;
765         char evt_path[MAXPATHLEN];
766
767         if (valid_debugfs_mount(debugfs_path))
768                 return;
769
770         sys_dir = opendir(debugfs_path);
771         if (!sys_dir)
772                 goto cleanup;
773         sys_dir_fd = dirfd(sys_dir);
774
775         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
776                 int dfd = openat(sys_dir_fd, sys_dirent.d_name,
777                                  O_RDONLY|O_DIRECTORY), evt_dir_fd;
778                 if (dfd == -1)
779                         continue;
780                 evt_dir = fdopendir(dfd);
781                 if (!evt_dir) {
782                         close(dfd);
783                         continue;
784                 }
785                 evt_dir_fd = dirfd(evt_dir);
786                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
787                         snprintf(evt_path, MAXPATHLEN, "%s:%s",
788                                  sys_dirent.d_name, evt_dirent.d_name);
789                         fprintf(stderr, "  %-42s [%s]\n", evt_path,
790                                 event_type_descriptors[PERF_TYPE_TRACEPOINT+1]);
791                 }
792                 closedir(evt_dir);
793         }
794
795 cleanup:
796         closedir(sys_dir);
797 }
798
799 /*
800  * Print the help text for the event symbols:
801  */
802 void print_events(void)
803 {
804         struct event_symbol *syms = event_symbols;
805         unsigned int i, type, op, prev_type = -1;
806         char name[40];
807
808         fprintf(stderr, "\n");
809         fprintf(stderr, "List of pre-defined events (to be used in -e):\n");
810
811         for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
812                 type = syms->type + 1;
813                 if (type >= ARRAY_SIZE(event_type_descriptors))
814                         type = 0;
815
816                 if (type != prev_type)
817                         fprintf(stderr, "\n");
818
819                 if (strlen(syms->alias))
820                         sprintf(name, "%s OR %s", syms->symbol, syms->alias);
821                 else
822                         strcpy(name, syms->symbol);
823                 fprintf(stderr, "  %-42s [%s]\n", name,
824                         event_type_descriptors[type]);
825
826                 prev_type = type;
827         }
828
829         fprintf(stderr, "\n");
830         for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
831                 for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
832                         /* skip invalid cache type */
833                         if (!is_cache_op_valid(type, op))
834                                 continue;
835
836                         for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
837                                 fprintf(stderr, "  %-42s [%s]\n",
838                                         event_cache_name(type, op, i),
839                                         event_type_descriptors[4]);
840                         }
841                 }
842         }
843
844         fprintf(stderr, "\n");
845         fprintf(stderr, "  %-42s [raw hardware event descriptor]\n",
846                 "rNNN");
847         fprintf(stderr, "\n");
848
849         print_tracepoint_events();
850
851         exit(129);
852 }