Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[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 fd;
169         u64 id;
170         char evt_path[MAXPATHLEN];
171         char dir_path[MAXPATHLEN];
172
173         if (valid_debugfs_mount(debugfs_path))
174                 return NULL;
175
176         sys_dir = opendir(debugfs_path);
177         if (!sys_dir)
178                 return NULL;
179
180         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
181
182                 snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
183                          sys_dirent.d_name);
184                 evt_dir = opendir(dir_path);
185                 if (!evt_dir)
186                         continue;
187
188                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
189
190                         snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
191                                  evt_dirent.d_name);
192                         fd = open(evt_path, O_RDONLY);
193                         if (fd < 0)
194                                 continue;
195                         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
196                                 close(fd);
197                                 continue;
198                         }
199                         close(fd);
200                         id = atoll(id_buf);
201                         if (id == config) {
202                                 closedir(evt_dir);
203                                 closedir(sys_dir);
204                                 path = calloc(1, sizeof(path));
205                                 path->system = malloc(MAX_EVENT_LENGTH);
206                                 if (!path->system) {
207                                         free(path);
208                                         return NULL;
209                                 }
210                                 path->name = malloc(MAX_EVENT_LENGTH);
211                                 if (!path->name) {
212                                         free(path->system);
213                                         free(path);
214                                         return NULL;
215                                 }
216                                 strncpy(path->system, sys_dirent.d_name,
217                                         MAX_EVENT_LENGTH);
218                                 strncpy(path->name, evt_dirent.d_name,
219                                         MAX_EVENT_LENGTH);
220                                 return path;
221                         }
222                 }
223                 closedir(evt_dir);
224         }
225
226         closedir(sys_dir);
227         return NULL;
228 }
229
230 #define TP_PATH_LEN (MAX_EVENT_LENGTH * 2 + 1)
231 static const char *tracepoint_id_to_name(u64 config)
232 {
233         static char buf[TP_PATH_LEN];
234         struct tracepoint_path *path;
235
236         path = tracepoint_id_to_path(config);
237         if (path) {
238                 snprintf(buf, TP_PATH_LEN, "%s:%s", path->system, path->name);
239                 free(path->name);
240                 free(path->system);
241                 free(path);
242         } else
243                 snprintf(buf, TP_PATH_LEN, "%s:%s", "unknown", "unknown");
244
245         return buf;
246 }
247
248 static int is_cache_op_valid(u8 cache_type, u8 cache_op)
249 {
250         if (hw_cache_stat[cache_type] & COP(cache_op))
251                 return 1;       /* valid */
252         else
253                 return 0;       /* invalid */
254 }
255
256 static char *event_cache_name(u8 cache_type, u8 cache_op, u8 cache_result)
257 {
258         static char name[50];
259
260         if (cache_result) {
261                 sprintf(name, "%s-%s-%s", hw_cache[cache_type][0],
262                         hw_cache_op[cache_op][0],
263                         hw_cache_result[cache_result][0]);
264         } else {
265                 sprintf(name, "%s-%s", hw_cache[cache_type][0],
266                         hw_cache_op[cache_op][1]);
267         }
268
269         return name;
270 }
271
272 const char *event_name(int counter)
273 {
274         u64 config = attrs[counter].config;
275         int type = attrs[counter].type;
276
277         return __event_name(type, config);
278 }
279
280 const char *__event_name(int type, u64 config)
281 {
282         static char buf[32];
283
284         if (type == PERF_TYPE_RAW) {
285                 sprintf(buf, "raw 0x%llx", config);
286                 return buf;
287         }
288
289         switch (type) {
290         case PERF_TYPE_HARDWARE:
291                 if (config < PERF_COUNT_HW_MAX)
292                         return hw_event_names[config];
293                 return "unknown-hardware";
294
295         case PERF_TYPE_HW_CACHE: {
296                 u8 cache_type, cache_op, cache_result;
297
298                 cache_type   = (config >>  0) & 0xff;
299                 if (cache_type > PERF_COUNT_HW_CACHE_MAX)
300                         return "unknown-ext-hardware-cache-type";
301
302                 cache_op     = (config >>  8) & 0xff;
303                 if (cache_op > PERF_COUNT_HW_CACHE_OP_MAX)
304                         return "unknown-ext-hardware-cache-op";
305
306                 cache_result = (config >> 16) & 0xff;
307                 if (cache_result > PERF_COUNT_HW_CACHE_RESULT_MAX)
308                         return "unknown-ext-hardware-cache-result";
309
310                 if (!is_cache_op_valid(cache_type, cache_op))
311                         return "invalid-cache";
312
313                 return event_cache_name(cache_type, cache_op, cache_result);
314         }
315
316         case PERF_TYPE_SOFTWARE:
317                 if (config < PERF_COUNT_SW_MAX)
318                         return sw_event_names[config];
319                 return "unknown-software";
320
321         case PERF_TYPE_TRACEPOINT:
322                 return tracepoint_id_to_name(config);
323
324         default:
325                 break;
326         }
327
328         return "unknown";
329 }
330
331 static int parse_aliases(const char **str, const char *names[][MAX_ALIASES], int size)
332 {
333         int i, j;
334         int n, longest = -1;
335
336         for (i = 0; i < size; i++) {
337                 for (j = 0; j < MAX_ALIASES && names[i][j]; j++) {
338                         n = strlen(names[i][j]);
339                         if (n > longest && !strncasecmp(*str, names[i][j], n))
340                                 longest = n;
341                 }
342                 if (longest > 0) {
343                         *str += longest;
344                         return i;
345                 }
346         }
347
348         return -1;
349 }
350
351 static enum event_result
352 parse_generic_hw_event(const char **str, struct perf_event_attr *attr)
353 {
354         const char *s = *str;
355         int cache_type = -1, cache_op = -1, cache_result = -1;
356
357         cache_type = parse_aliases(&s, hw_cache, PERF_COUNT_HW_CACHE_MAX);
358         /*
359          * No fallback - if we cannot get a clear cache type
360          * then bail out:
361          */
362         if (cache_type == -1)
363                 return EVT_FAILED;
364
365         while ((cache_op == -1 || cache_result == -1) && *s == '-') {
366                 ++s;
367
368                 if (cache_op == -1) {
369                         cache_op = parse_aliases(&s, hw_cache_op,
370                                                 PERF_COUNT_HW_CACHE_OP_MAX);
371                         if (cache_op >= 0) {
372                                 if (!is_cache_op_valid(cache_type, cache_op))
373                                         return 0;
374                                 continue;
375                         }
376                 }
377
378                 if (cache_result == -1) {
379                         cache_result = parse_aliases(&s, hw_cache_result,
380                                                 PERF_COUNT_HW_CACHE_RESULT_MAX);
381                         if (cache_result >= 0)
382                                 continue;
383                 }
384
385                 /*
386                  * Can't parse this as a cache op or result, so back up
387                  * to the '-'.
388                  */
389                 --s;
390                 break;
391         }
392
393         /*
394          * Fall back to reads:
395          */
396         if (cache_op == -1)
397                 cache_op = PERF_COUNT_HW_CACHE_OP_READ;
398
399         /*
400          * Fall back to accesses:
401          */
402         if (cache_result == -1)
403                 cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;
404
405         attr->config = cache_type | (cache_op << 8) | (cache_result << 16);
406         attr->type = PERF_TYPE_HW_CACHE;
407
408         *str = s;
409         return EVT_HANDLED;
410 }
411
412 static enum event_result
413 parse_single_tracepoint_event(char *sys_name,
414                               const char *evt_name,
415                               unsigned int evt_length,
416                               char *flags,
417                               struct perf_event_attr *attr,
418                               const char **strp)
419 {
420         char evt_path[MAXPATHLEN];
421         char id_buf[4];
422         u64 id;
423         int fd;
424
425         if (flags) {
426                 if (!strncmp(flags, "record", strlen(flags))) {
427                         attr->sample_type |= PERF_SAMPLE_RAW;
428                         attr->sample_type |= PERF_SAMPLE_TIME;
429                         attr->sample_type |= PERF_SAMPLE_CPU;
430                 }
431         }
432
433         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
434                  sys_name, evt_name);
435
436         fd = open(evt_path, O_RDONLY);
437         if (fd < 0)
438                 return EVT_FAILED;
439
440         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
441                 close(fd);
442                 return EVT_FAILED;
443         }
444
445         close(fd);
446         id = atoll(id_buf);
447         attr->config = id;
448         attr->type = PERF_TYPE_TRACEPOINT;
449         *strp = evt_name + evt_length;
450
451         return EVT_HANDLED;
452 }
453
454 /* sys + ':' + event + ':' + flags*/
455 #define MAX_EVOPT_LEN   (MAX_EVENT_LENGTH * 2 + 2 + 128)
456 static enum event_result
457 parse_subsystem_tracepoint_event(char *sys_name, char *flags)
458 {
459         char evt_path[MAXPATHLEN];
460         struct dirent *evt_ent;
461         DIR *evt_dir;
462
463         snprintf(evt_path, MAXPATHLEN, "%s/%s", debugfs_path, sys_name);
464         evt_dir = opendir(evt_path);
465
466         if (!evt_dir) {
467                 perror("Can't open event dir");
468                 return EVT_FAILED;
469         }
470
471         while ((evt_ent = readdir(evt_dir))) {
472                 char event_opt[MAX_EVOPT_LEN + 1];
473                 int len;
474                 unsigned int rem = MAX_EVOPT_LEN;
475
476                 if (!strcmp(evt_ent->d_name, ".")
477                     || !strcmp(evt_ent->d_name, "..")
478                     || !strcmp(evt_ent->d_name, "enable")
479                     || !strcmp(evt_ent->d_name, "filter"))
480                         continue;
481
482                 len = snprintf(event_opt, MAX_EVOPT_LEN, "%s:%s", sys_name,
483                                evt_ent->d_name);
484                 if (len < 0)
485                         return EVT_FAILED;
486
487                 rem -= len;
488                 if (flags) {
489                         if (rem < strlen(flags) + 1)
490                                 return EVT_FAILED;
491
492                         strcat(event_opt, ":");
493                         strcat(event_opt, flags);
494                 }
495
496                 if (parse_events(NULL, event_opt, 0))
497                         return EVT_FAILED;
498         }
499
500         return EVT_HANDLED_ALL;
501 }
502
503
504 static enum event_result parse_tracepoint_event(const char **strp,
505                                     struct perf_event_attr *attr)
506 {
507         const char *evt_name;
508         char *flags;
509         char sys_name[MAX_EVENT_LENGTH];
510         unsigned int sys_length, evt_length;
511
512         if (valid_debugfs_mount(debugfs_path))
513                 return 0;
514
515         evt_name = strchr(*strp, ':');
516         if (!evt_name)
517                 return EVT_FAILED;
518
519         sys_length = evt_name - *strp;
520         if (sys_length >= MAX_EVENT_LENGTH)
521                 return 0;
522
523         strncpy(sys_name, *strp, sys_length);
524         sys_name[sys_length] = '\0';
525         evt_name = evt_name + 1;
526
527         flags = strchr(evt_name, ':');
528         if (flags) {
529                 /* split it out: */
530                 evt_name = strndup(evt_name, flags - evt_name);
531                 flags++;
532         }
533
534         evt_length = strlen(evt_name);
535         if (evt_length >= MAX_EVENT_LENGTH)
536                 return EVT_FAILED;
537
538         if (!strcmp(evt_name, "*")) {
539                 *strp = evt_name + evt_length;
540                 return parse_subsystem_tracepoint_event(sys_name, flags);
541         } else
542                 return parse_single_tracepoint_event(sys_name, evt_name,
543                                                      evt_length, flags,
544                                                      attr, strp);
545 }
546
547 static int check_events(const char *str, unsigned int i)
548 {
549         int n;
550
551         n = strlen(event_symbols[i].symbol);
552         if (!strncmp(str, event_symbols[i].symbol, n))
553                 return n;
554
555         n = strlen(event_symbols[i].alias);
556         if (n)
557                 if (!strncmp(str, event_symbols[i].alias, n))
558                         return n;
559         return 0;
560 }
561
562 static enum event_result
563 parse_symbolic_event(const char **strp, struct perf_event_attr *attr)
564 {
565         const char *str = *strp;
566         unsigned int i;
567         int n;
568
569         for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
570                 n = check_events(str, i);
571                 if (n > 0) {
572                         attr->type = event_symbols[i].type;
573                         attr->config = event_symbols[i].config;
574                         *strp = str + n;
575                         return EVT_HANDLED;
576                 }
577         }
578         return EVT_FAILED;
579 }
580
581 static enum event_result
582 parse_raw_event(const char **strp, struct perf_event_attr *attr)
583 {
584         const char *str = *strp;
585         u64 config;
586         int n;
587
588         if (*str != 'r')
589                 return EVT_FAILED;
590         n = hex2u64(str + 1, &config);
591         if (n > 0) {
592                 *strp = str + n + 1;
593                 attr->type = PERF_TYPE_RAW;
594                 attr->config = config;
595                 return EVT_HANDLED;
596         }
597         return EVT_FAILED;
598 }
599
600 static enum event_result
601 parse_numeric_event(const char **strp, struct perf_event_attr *attr)
602 {
603         const char *str = *strp;
604         char *endp;
605         unsigned long type;
606         u64 config;
607
608         type = strtoul(str, &endp, 0);
609         if (endp > str && type < PERF_TYPE_MAX && *endp == ':') {
610                 str = endp + 1;
611                 config = strtoul(str, &endp, 0);
612                 if (endp > str) {
613                         attr->type = type;
614                         attr->config = config;
615                         *strp = endp;
616                         return EVT_HANDLED;
617                 }
618         }
619         return EVT_FAILED;
620 }
621
622 static enum event_result
623 parse_event_modifier(const char **strp, struct perf_event_attr *attr)
624 {
625         const char *str = *strp;
626         int eu = 1, ek = 1, eh = 1;
627
628         if (*str++ != ':')
629                 return 0;
630         while (*str) {
631                 if (*str == 'u')
632                         eu = 0;
633                 else if (*str == 'k')
634                         ek = 0;
635                 else if (*str == 'h')
636                         eh = 0;
637                 else
638                         break;
639                 ++str;
640         }
641         if (str >= *strp + 2) {
642                 *strp = str;
643                 attr->exclude_user   = eu;
644                 attr->exclude_kernel = ek;
645                 attr->exclude_hv     = eh;
646                 return 1;
647         }
648         return 0;
649 }
650
651 /*
652  * Each event can have multiple symbolic names.
653  * Symbolic names are (almost) exactly matched.
654  */
655 static enum event_result
656 parse_event_symbols(const char **str, struct perf_event_attr *attr)
657 {
658         enum event_result ret;
659
660         ret = parse_tracepoint_event(str, attr);
661         if (ret != EVT_FAILED)
662                 goto modifier;
663
664         ret = parse_raw_event(str, attr);
665         if (ret != EVT_FAILED)
666                 goto modifier;
667
668         ret = parse_numeric_event(str, attr);
669         if (ret != EVT_FAILED)
670                 goto modifier;
671
672         ret = parse_symbolic_event(str, attr);
673         if (ret != EVT_FAILED)
674                 goto modifier;
675
676         ret = parse_generic_hw_event(str, attr);
677         if (ret != EVT_FAILED)
678                 goto modifier;
679
680         return EVT_FAILED;
681
682 modifier:
683         parse_event_modifier(str, attr);
684
685         return ret;
686 }
687
688 static void store_event_type(const char *orgname)
689 {
690         char filename[PATH_MAX], *c;
691         FILE *file;
692         int id;
693
694         sprintf(filename, "/sys/kernel/debug/tracing/events/%s/id", orgname);
695         c = strchr(filename, ':');
696         if (c)
697                 *c = '/';
698
699         file = fopen(filename, "r");
700         if (!file)
701                 return;
702         if (fscanf(file, "%i", &id) < 1)
703                 die("cannot store event ID");
704         fclose(file);
705         perf_header__push_event(id, orgname);
706 }
707
708
709 int parse_events(const struct option *opt __used, const char *str, int unset __used)
710 {
711         struct perf_event_attr attr;
712         enum event_result ret;
713
714         if (strchr(str, ':'))
715                 store_event_type(str);
716
717         for (;;) {
718                 if (nr_counters == MAX_COUNTERS)
719                         return -1;
720
721                 memset(&attr, 0, sizeof(attr));
722                 ret = parse_event_symbols(&str, &attr);
723                 if (ret == EVT_FAILED)
724                         return -1;
725
726                 if (!(*str == 0 || *str == ',' || isspace(*str)))
727                         return -1;
728
729                 if (ret != EVT_HANDLED_ALL) {
730                         attrs[nr_counters] = attr;
731                         nr_counters++;
732                 }
733
734                 if (*str == 0)
735                         break;
736                 if (*str == ',')
737                         ++str;
738                 while (isspace(*str))
739                         ++str;
740         }
741
742         return 0;
743 }
744
745 static const char * const event_type_descriptors[] = {
746         "",
747         "Hardware event",
748         "Software event",
749         "Tracepoint event",
750         "Hardware cache event",
751 };
752
753 /*
754  * Print the events from <debugfs_mount_point>/tracing/events
755  */
756
757 static void print_tracepoint_events(void)
758 {
759         DIR *sys_dir, *evt_dir;
760         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
761         char evt_path[MAXPATHLEN];
762         char dir_path[MAXPATHLEN];
763
764         if (valid_debugfs_mount(debugfs_path))
765                 return;
766
767         sys_dir = opendir(debugfs_path);
768         if (!sys_dir)
769                 return;
770
771         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
772
773                 snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
774                          sys_dirent.d_name);
775                 evt_dir = opendir(dir_path);
776                 if (!evt_dir)
777                         continue;
778
779                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
780                         snprintf(evt_path, MAXPATHLEN, "%s:%s",
781                                  sys_dirent.d_name, evt_dirent.d_name);
782                         fprintf(stderr, "  %-42s [%s]\n", evt_path,
783                                 event_type_descriptors[PERF_TYPE_TRACEPOINT+1]);
784                 }
785                 closedir(evt_dir);
786         }
787         closedir(sys_dir);
788 }
789
790 /*
791  * Print the help text for the event symbols:
792  */
793 void print_events(void)
794 {
795         struct event_symbol *syms = event_symbols;
796         unsigned int i, type, op, prev_type = -1;
797         char name[40];
798
799         fprintf(stderr, "\n");
800         fprintf(stderr, "List of pre-defined events (to be used in -e):\n");
801
802         for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
803                 type = syms->type + 1;
804                 if (type >= ARRAY_SIZE(event_type_descriptors))
805                         type = 0;
806
807                 if (type != prev_type)
808                         fprintf(stderr, "\n");
809
810                 if (strlen(syms->alias))
811                         sprintf(name, "%s OR %s", syms->symbol, syms->alias);
812                 else
813                         strcpy(name, syms->symbol);
814                 fprintf(stderr, "  %-42s [%s]\n", name,
815                         event_type_descriptors[type]);
816
817                 prev_type = type;
818         }
819
820         fprintf(stderr, "\n");
821         for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
822                 for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
823                         /* skip invalid cache type */
824                         if (!is_cache_op_valid(type, op))
825                                 continue;
826
827                         for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
828                                 fprintf(stderr, "  %-42s [%s]\n",
829                                         event_cache_name(type, op, i),
830                                         event_type_descriptors[4]);
831                         }
832                 }
833         }
834
835         fprintf(stderr, "\n");
836         fprintf(stderr, "  %-42s [raw hardware event descriptor]\n",
837                 "rNNN");
838         fprintf(stderr, "\n");
839
840         print_tracepoint_events();
841
842         exit(129);
843 }