perf tools: Modify perf routines to use new debugfs routines
[linux-2.6.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 #include "debugfs.h"
11
12 int                             nr_counters;
13
14 struct perf_event_attr          attrs[MAX_COUNTERS];
15 char                            *filters[MAX_COUNTERS];
16
17 struct event_symbol {
18         u8              type;
19         u64             config;
20         const char      *symbol;
21         const char      *alias;
22 };
23
24 enum event_result {
25         EVT_FAILED,
26         EVT_HANDLED,
27         EVT_HANDLED_ALL
28 };
29
30 char debugfs_path[MAXPATHLEN];
31
32 #define CHW(x) .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_##x
33 #define CSW(x) .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_##x
34
35 static struct event_symbol event_symbols[] = {
36   { CHW(CPU_CYCLES),            "cpu-cycles",           "cycles"        },
37   { CHW(INSTRUCTIONS),          "instructions",         ""              },
38   { CHW(CACHE_REFERENCES),      "cache-references",     ""              },
39   { CHW(CACHE_MISSES),          "cache-misses",         ""              },
40   { CHW(BRANCH_INSTRUCTIONS),   "branch-instructions",  "branches"      },
41   { CHW(BRANCH_MISSES),         "branch-misses",        ""              },
42   { CHW(BUS_CYCLES),            "bus-cycles",           ""              },
43
44   { CSW(CPU_CLOCK),             "cpu-clock",            ""              },
45   { CSW(TASK_CLOCK),            "task-clock",           ""              },
46   { CSW(PAGE_FAULTS),           "page-faults",          "faults"        },
47   { CSW(PAGE_FAULTS_MIN),       "minor-faults",         ""              },
48   { CSW(PAGE_FAULTS_MAJ),       "major-faults",         ""              },
49   { CSW(CONTEXT_SWITCHES),      "context-switches",     "cs"            },
50   { CSW(CPU_MIGRATIONS),        "cpu-migrations",       "migrations"    },
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 };
80
81 #define MAX_ALIASES 8
82
83 static const char *hw_cache[][MAX_ALIASES] = {
84  { "L1-dcache", "l1-d",         "l1d",          "L1-data",              },
85  { "L1-icache", "l1-i",         "l1i",          "L1-instruction",       },
86  { "LLC",       "L2"                                                    },
87  { "dTLB",      "d-tlb",        "Data-TLB",                             },
88  { "iTLB",      "i-tlb",        "Instruction-TLB",                      },
89  { "branch",    "branches",     "bpu",          "btb",          "bpc",  },
90 };
91
92 static const char *hw_cache_op[][MAX_ALIASES] = {
93  { "load",      "loads",        "read",                                 },
94  { "store",     "stores",       "write",                                },
95  { "prefetch",  "prefetches",   "speculative-read", "speculative-load", },
96 };
97
98 static const char *hw_cache_result[][MAX_ALIASES] = {
99  { "refs",      "Reference",    "ops",          "access",               },
100  { "misses",    "miss",                                                 },
101 };
102
103 #define C(x)            PERF_COUNT_HW_CACHE_##x
104 #define CACHE_READ      (1 << C(OP_READ))
105 #define CACHE_WRITE     (1 << C(OP_WRITE))
106 #define CACHE_PREFETCH  (1 << C(OP_PREFETCH))
107 #define COP(x)          (1 << x)
108
109 /*
110  * cache operartion stat
111  * L1I : Read and prefetch only
112  * ITLB and BPU : Read-only
113  */
114 static unsigned long hw_cache_stat[C(MAX)] = {
115  [C(L1D)]       = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
116  [C(L1I)]       = (CACHE_READ | CACHE_PREFETCH),
117  [C(LL)]        = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
118  [C(DTLB)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
119  [C(ITLB)]      = (CACHE_READ),
120  [C(BPU)]       = (CACHE_READ),
121 };
122
123 #define for_each_subsystem(sys_dir, sys_dirent, sys_next)              \
124         while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next)        \
125         if (sys_dirent.d_type == DT_DIR &&                                     \
126            (strcmp(sys_dirent.d_name, ".")) &&                                 \
127            (strcmp(sys_dirent.d_name, "..")))
128
129 static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
130 {
131         char evt_path[MAXPATHLEN];
132         int fd;
133
134         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
135                         sys_dir->d_name, evt_dir->d_name);
136         fd = open(evt_path, O_RDONLY);
137         if (fd < 0)
138                 return -EINVAL;
139         close(fd);
140
141         return 0;
142 }
143
144 #define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next)              \
145         while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next)        \
146         if (evt_dirent.d_type == DT_DIR &&                                     \
147            (strcmp(evt_dirent.d_name, ".")) &&                                 \
148            (strcmp(evt_dirent.d_name, "..")) &&                                \
149            (!tp_event_has_id(&sys_dirent, &evt_dirent)))
150
151 #define MAX_EVENT_LENGTH 512
152
153
154 struct tracepoint_path *tracepoint_id_to_path(u64 config)
155 {
156         struct tracepoint_path *path = NULL;
157         DIR *sys_dir, *evt_dir;
158         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
159         char id_buf[4];
160         int fd;
161         u64 id;
162         char evt_path[MAXPATHLEN];
163         char dir_path[MAXPATHLEN];
164
165         if (debugfs_valid_mountpoint(debugfs_path))
166                 return NULL;
167
168         sys_dir = opendir(debugfs_path);
169         if (!sys_dir)
170                 return NULL;
171
172         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
173
174                 snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
175                          sys_dirent.d_name);
176                 evt_dir = opendir(dir_path);
177                 if (!evt_dir)
178                         continue;
179
180                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
181
182                         snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
183                                  evt_dirent.d_name);
184                         fd = open(evt_path, O_RDONLY);
185                         if (fd < 0)
186                                 continue;
187                         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
188                                 close(fd);
189                                 continue;
190                         }
191                         close(fd);
192                         id = atoll(id_buf);
193                         if (id == config) {
194                                 closedir(evt_dir);
195                                 closedir(sys_dir);
196                                 path = calloc(1, sizeof(path));
197                                 path->system = malloc(MAX_EVENT_LENGTH);
198                                 if (!path->system) {
199                                         free(path);
200                                         return NULL;
201                                 }
202                                 path->name = malloc(MAX_EVENT_LENGTH);
203                                 if (!path->name) {
204                                         free(path->system);
205                                         free(path);
206                                         return NULL;
207                                 }
208                                 strncpy(path->system, sys_dirent.d_name,
209                                         MAX_EVENT_LENGTH);
210                                 strncpy(path->name, evt_dirent.d_name,
211                                         MAX_EVENT_LENGTH);
212                                 return path;
213                         }
214                 }
215                 closedir(evt_dir);
216         }
217
218         closedir(sys_dir);
219         return NULL;
220 }
221
222 #define TP_PATH_LEN (MAX_EVENT_LENGTH * 2 + 1)
223 static const char *tracepoint_id_to_name(u64 config)
224 {
225         static char buf[TP_PATH_LEN];
226         struct tracepoint_path *path;
227
228         path = tracepoint_id_to_path(config);
229         if (path) {
230                 snprintf(buf, TP_PATH_LEN, "%s:%s", path->system, path->name);
231                 free(path->name);
232                 free(path->system);
233                 free(path);
234         } else
235                 snprintf(buf, TP_PATH_LEN, "%s:%s", "unknown", "unknown");
236
237         return buf;
238 }
239
240 static int is_cache_op_valid(u8 cache_type, u8 cache_op)
241 {
242         if (hw_cache_stat[cache_type] & COP(cache_op))
243                 return 1;       /* valid */
244         else
245                 return 0;       /* invalid */
246 }
247
248 static char *event_cache_name(u8 cache_type, u8 cache_op, u8 cache_result)
249 {
250         static char name[50];
251
252         if (cache_result) {
253                 sprintf(name, "%s-%s-%s", hw_cache[cache_type][0],
254                         hw_cache_op[cache_op][0],
255                         hw_cache_result[cache_result][0]);
256         } else {
257                 sprintf(name, "%s-%s", hw_cache[cache_type][0],
258                         hw_cache_op[cache_op][1]);
259         }
260
261         return name;
262 }
263
264 const char *event_name(int counter)
265 {
266         u64 config = attrs[counter].config;
267         int type = attrs[counter].type;
268
269         return __event_name(type, config);
270 }
271
272 const char *__event_name(int type, u64 config)
273 {
274         static char buf[32];
275
276         if (type == PERF_TYPE_RAW) {
277                 sprintf(buf, "raw 0x%llx", config);
278                 return buf;
279         }
280
281         switch (type) {
282         case PERF_TYPE_HARDWARE:
283                 if (config < PERF_COUNT_HW_MAX)
284                         return hw_event_names[config];
285                 return "unknown-hardware";
286
287         case PERF_TYPE_HW_CACHE: {
288                 u8 cache_type, cache_op, cache_result;
289
290                 cache_type   = (config >>  0) & 0xff;
291                 if (cache_type > PERF_COUNT_HW_CACHE_MAX)
292                         return "unknown-ext-hardware-cache-type";
293
294                 cache_op     = (config >>  8) & 0xff;
295                 if (cache_op > PERF_COUNT_HW_CACHE_OP_MAX)
296                         return "unknown-ext-hardware-cache-op";
297
298                 cache_result = (config >> 16) & 0xff;
299                 if (cache_result > PERF_COUNT_HW_CACHE_RESULT_MAX)
300                         return "unknown-ext-hardware-cache-result";
301
302                 if (!is_cache_op_valid(cache_type, cache_op))
303                         return "invalid-cache";
304
305                 return event_cache_name(cache_type, cache_op, cache_result);
306         }
307
308         case PERF_TYPE_SOFTWARE:
309                 if (config < PERF_COUNT_SW_MAX)
310                         return sw_event_names[config];
311                 return "unknown-software";
312
313         case PERF_TYPE_TRACEPOINT:
314                 return tracepoint_id_to_name(config);
315
316         default:
317                 break;
318         }
319
320         return "unknown";
321 }
322
323 static int parse_aliases(const char **str, const char *names[][MAX_ALIASES], int size)
324 {
325         int i, j;
326         int n, longest = -1;
327
328         for (i = 0; i < size; i++) {
329                 for (j = 0; j < MAX_ALIASES && names[i][j]; j++) {
330                         n = strlen(names[i][j]);
331                         if (n > longest && !strncasecmp(*str, names[i][j], n))
332                                 longest = n;
333                 }
334                 if (longest > 0) {
335                         *str += longest;
336                         return i;
337                 }
338         }
339
340         return -1;
341 }
342
343 static enum event_result
344 parse_generic_hw_event(const char **str, struct perf_event_attr *attr)
345 {
346         const char *s = *str;
347         int cache_type = -1, cache_op = -1, cache_result = -1;
348
349         cache_type = parse_aliases(&s, hw_cache, PERF_COUNT_HW_CACHE_MAX);
350         /*
351          * No fallback - if we cannot get a clear cache type
352          * then bail out:
353          */
354         if (cache_type == -1)
355                 return EVT_FAILED;
356
357         while ((cache_op == -1 || cache_result == -1) && *s == '-') {
358                 ++s;
359
360                 if (cache_op == -1) {
361                         cache_op = parse_aliases(&s, hw_cache_op,
362                                                 PERF_COUNT_HW_CACHE_OP_MAX);
363                         if (cache_op >= 0) {
364                                 if (!is_cache_op_valid(cache_type, cache_op))
365                                         return 0;
366                                 continue;
367                         }
368                 }
369
370                 if (cache_result == -1) {
371                         cache_result = parse_aliases(&s, hw_cache_result,
372                                                 PERF_COUNT_HW_CACHE_RESULT_MAX);
373                         if (cache_result >= 0)
374                                 continue;
375                 }
376
377                 /*
378                  * Can't parse this as a cache op or result, so back up
379                  * to the '-'.
380                  */
381                 --s;
382                 break;
383         }
384
385         /*
386          * Fall back to reads:
387          */
388         if (cache_op == -1)
389                 cache_op = PERF_COUNT_HW_CACHE_OP_READ;
390
391         /*
392          * Fall back to accesses:
393          */
394         if (cache_result == -1)
395                 cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;
396
397         attr->config = cache_type | (cache_op << 8) | (cache_result << 16);
398         attr->type = PERF_TYPE_HW_CACHE;
399
400         *str = s;
401         return EVT_HANDLED;
402 }
403
404 static enum event_result
405 parse_single_tracepoint_event(char *sys_name,
406                               const char *evt_name,
407                               unsigned int evt_length,
408                               char *flags,
409                               struct perf_event_attr *attr,
410                               const char **strp)
411 {
412         char evt_path[MAXPATHLEN];
413         char id_buf[4];
414         u64 id;
415         int fd;
416
417         if (flags) {
418                 if (!strncmp(flags, "record", strlen(flags))) {
419                         attr->sample_type |= PERF_SAMPLE_RAW;
420                         attr->sample_type |= PERF_SAMPLE_TIME;
421                         attr->sample_type |= PERF_SAMPLE_CPU;
422                 }
423         }
424
425         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
426                  sys_name, evt_name);
427
428         fd = open(evt_path, O_RDONLY);
429         if (fd < 0)
430                 return EVT_FAILED;
431
432         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
433                 close(fd);
434                 return EVT_FAILED;
435         }
436
437         close(fd);
438         id = atoll(id_buf);
439         attr->config = id;
440         attr->type = PERF_TYPE_TRACEPOINT;
441         *strp = evt_name + evt_length;
442
443         return EVT_HANDLED;
444 }
445
446 /* sys + ':' + event + ':' + flags*/
447 #define MAX_EVOPT_LEN   (MAX_EVENT_LENGTH * 2 + 2 + 128)
448 static enum event_result
449 parse_subsystem_tracepoint_event(char *sys_name, char *flags)
450 {
451         char evt_path[MAXPATHLEN];
452         struct dirent *evt_ent;
453         DIR *evt_dir;
454
455         snprintf(evt_path, MAXPATHLEN, "%s/%s", debugfs_path, sys_name);
456         evt_dir = opendir(evt_path);
457
458         if (!evt_dir) {
459                 perror("Can't open event dir");
460                 return EVT_FAILED;
461         }
462
463         while ((evt_ent = readdir(evt_dir))) {
464                 char event_opt[MAX_EVOPT_LEN + 1];
465                 int len;
466                 unsigned int rem = MAX_EVOPT_LEN;
467
468                 if (!strcmp(evt_ent->d_name, ".")
469                     || !strcmp(evt_ent->d_name, "..")
470                     || !strcmp(evt_ent->d_name, "enable")
471                     || !strcmp(evt_ent->d_name, "filter"))
472                         continue;
473
474                 len = snprintf(event_opt, MAX_EVOPT_LEN, "%s:%s", sys_name,
475                                evt_ent->d_name);
476                 if (len < 0)
477                         return EVT_FAILED;
478
479                 rem -= len;
480                 if (flags) {
481                         if (rem < strlen(flags) + 1)
482                                 return EVT_FAILED;
483
484                         strcat(event_opt, ":");
485                         strcat(event_opt, flags);
486                 }
487
488                 if (parse_events(NULL, event_opt, 0))
489                         return EVT_FAILED;
490         }
491
492         return EVT_HANDLED_ALL;
493 }
494
495
496 static enum event_result parse_tracepoint_event(const char **strp,
497                                     struct perf_event_attr *attr)
498 {
499         const char *evt_name;
500         char *flags;
501         char sys_name[MAX_EVENT_LENGTH];
502         unsigned int sys_length, evt_length;
503
504         if (debugfs_valid_mountpoint(debugfs_path))
505                 return 0;
506
507         evt_name = strchr(*strp, ':');
508         if (!evt_name)
509                 return EVT_FAILED;
510
511         sys_length = evt_name - *strp;
512         if (sys_length >= MAX_EVENT_LENGTH)
513                 return 0;
514
515         strncpy(sys_name, *strp, sys_length);
516         sys_name[sys_length] = '\0';
517         evt_name = evt_name + 1;
518
519         flags = strchr(evt_name, ':');
520         if (flags) {
521                 /* split it out: */
522                 evt_name = strndup(evt_name, flags - evt_name);
523                 flags++;
524         }
525
526         evt_length = strlen(evt_name);
527         if (evt_length >= MAX_EVENT_LENGTH)
528                 return EVT_FAILED;
529
530         if (!strcmp(evt_name, "*")) {
531                 *strp = evt_name + evt_length;
532                 return parse_subsystem_tracepoint_event(sys_name, flags);
533         } else
534                 return parse_single_tracepoint_event(sys_name, evt_name,
535                                                      evt_length, flags,
536                                                      attr, strp);
537 }
538
539 static int check_events(const char *str, unsigned int i)
540 {
541         int n;
542
543         n = strlen(event_symbols[i].symbol);
544         if (!strncmp(str, event_symbols[i].symbol, n))
545                 return n;
546
547         n = strlen(event_symbols[i].alias);
548         if (n)
549                 if (!strncmp(str, event_symbols[i].alias, n))
550                         return n;
551         return 0;
552 }
553
554 static enum event_result
555 parse_symbolic_event(const char **strp, struct perf_event_attr *attr)
556 {
557         const char *str = *strp;
558         unsigned int i;
559         int n;
560
561         for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
562                 n = check_events(str, i);
563                 if (n > 0) {
564                         attr->type = event_symbols[i].type;
565                         attr->config = event_symbols[i].config;
566                         *strp = str + n;
567                         return EVT_HANDLED;
568                 }
569         }
570         return EVT_FAILED;
571 }
572
573 static enum event_result
574 parse_raw_event(const char **strp, struct perf_event_attr *attr)
575 {
576         const char *str = *strp;
577         u64 config;
578         int n;
579
580         if (*str != 'r')
581                 return EVT_FAILED;
582         n = hex2u64(str + 1, &config);
583         if (n > 0) {
584                 *strp = str + n + 1;
585                 attr->type = PERF_TYPE_RAW;
586                 attr->config = config;
587                 return EVT_HANDLED;
588         }
589         return EVT_FAILED;
590 }
591
592 static enum event_result
593 parse_numeric_event(const char **strp, struct perf_event_attr *attr)
594 {
595         const char *str = *strp;
596         char *endp;
597         unsigned long type;
598         u64 config;
599
600         type = strtoul(str, &endp, 0);
601         if (endp > str && type < PERF_TYPE_MAX && *endp == ':') {
602                 str = endp + 1;
603                 config = strtoul(str, &endp, 0);
604                 if (endp > str) {
605                         attr->type = type;
606                         attr->config = config;
607                         *strp = endp;
608                         return EVT_HANDLED;
609                 }
610         }
611         return EVT_FAILED;
612 }
613
614 static enum event_result
615 parse_event_modifier(const char **strp, struct perf_event_attr *attr)
616 {
617         const char *str = *strp;
618         int eu = 1, ek = 1, eh = 1;
619
620         if (*str++ != ':')
621                 return 0;
622         while (*str) {
623                 if (*str == 'u')
624                         eu = 0;
625                 else if (*str == 'k')
626                         ek = 0;
627                 else if (*str == 'h')
628                         eh = 0;
629                 else
630                         break;
631                 ++str;
632         }
633         if (str >= *strp + 2) {
634                 *strp = str;
635                 attr->exclude_user   = eu;
636                 attr->exclude_kernel = ek;
637                 attr->exclude_hv     = eh;
638                 return 1;
639         }
640         return 0;
641 }
642
643 /*
644  * Each event can have multiple symbolic names.
645  * Symbolic names are (almost) exactly matched.
646  */
647 static enum event_result
648 parse_event_symbols(const char **str, struct perf_event_attr *attr)
649 {
650         enum event_result ret;
651
652         ret = parse_tracepoint_event(str, attr);
653         if (ret != EVT_FAILED)
654                 goto modifier;
655
656         ret = parse_raw_event(str, attr);
657         if (ret != EVT_FAILED)
658                 goto modifier;
659
660         ret = parse_numeric_event(str, attr);
661         if (ret != EVT_FAILED)
662                 goto modifier;
663
664         ret = parse_symbolic_event(str, attr);
665         if (ret != EVT_FAILED)
666                 goto modifier;
667
668         ret = parse_generic_hw_event(str, attr);
669         if (ret != EVT_FAILED)
670                 goto modifier;
671
672         fprintf(stderr, "invalid or unsupported event: '%s'\n", *str);
673         fprintf(stderr, "Run 'perf list' for a list of valid events\n");
674         return EVT_FAILED;
675
676 modifier:
677         parse_event_modifier(str, attr);
678
679         return ret;
680 }
681
682 static void store_event_type(const char *orgname)
683 {
684         char filename[PATH_MAX], *c;
685         FILE *file;
686         int id;
687
688         sprintf(filename, "%s/", debugfs_path);
689         strncat(filename, orgname, strlen(orgname));
690         strcat(filename, "/id");
691
692         c = strchr(filename, ':');
693         if (c)
694                 *c = '/';
695
696         file = fopen(filename, "r");
697         if (!file)
698                 return;
699         if (fscanf(file, "%i", &id) < 1)
700                 die("cannot store event ID");
701         fclose(file);
702         perf_header__push_event(id, orgname);
703 }
704
705 int parse_events(const struct option *opt __used, const char *str, int unset __used)
706 {
707         struct perf_event_attr attr;
708         enum event_result ret;
709
710         if (strchr(str, ':'))
711                 store_event_type(str);
712
713         for (;;) {
714                 if (nr_counters == MAX_COUNTERS)
715                         return -1;
716
717                 memset(&attr, 0, sizeof(attr));
718                 ret = parse_event_symbols(&str, &attr);
719                 if (ret == EVT_FAILED)
720                         return -1;
721
722                 if (!(*str == 0 || *str == ',' || isspace(*str)))
723                         return -1;
724
725                 if (ret != EVT_HANDLED_ALL) {
726                         attrs[nr_counters] = attr;
727                         nr_counters++;
728                 }
729
730                 if (*str == 0)
731                         break;
732                 if (*str == ',')
733                         ++str;
734                 while (isspace(*str))
735                         ++str;
736         }
737
738         return 0;
739 }
740
741 int parse_filter(const struct option *opt __used, const char *str,
742                  int unset __used)
743 {
744         int i = nr_counters - 1;
745         int len = strlen(str);
746
747         if (i < 0 || attrs[i].type != PERF_TYPE_TRACEPOINT) {
748                 fprintf(stderr,
749                         "-F option should follow a -e tracepoint option\n");
750                 return -1;
751         }
752
753         filters[i] = malloc(len + 1);
754         if (!filters[i]) {
755                 fprintf(stderr, "not enough memory to hold filter string\n");
756                 return -1;
757         }
758         strcpy(filters[i], str);
759
760         return 0;
761 }
762
763 static const char * const event_type_descriptors[] = {
764         "",
765         "Hardware event",
766         "Software event",
767         "Tracepoint event",
768         "Hardware cache event",
769 };
770
771 /*
772  * Print the events from <debugfs_mount_point>/tracing/events
773  */
774
775 static void print_tracepoint_events(void)
776 {
777         DIR *sys_dir, *evt_dir;
778         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
779         char evt_path[MAXPATHLEN];
780         char dir_path[MAXPATHLEN];
781
782         if (debugfs_valid_mountpoint(debugfs_path))
783                 return;
784
785         sys_dir = opendir(debugfs_path);
786         if (!sys_dir)
787                 return;
788
789         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
790
791                 snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
792                          sys_dirent.d_name);
793                 evt_dir = opendir(dir_path);
794                 if (!evt_dir)
795                         continue;
796
797                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
798                         snprintf(evt_path, MAXPATHLEN, "%s:%s",
799                                  sys_dirent.d_name, evt_dirent.d_name);
800                         printf("  %-42s [%s]\n", evt_path,
801                                 event_type_descriptors[PERF_TYPE_TRACEPOINT+1]);
802                 }
803                 closedir(evt_dir);
804         }
805         closedir(sys_dir);
806 }
807
808 /*
809  * Print the help text for the event symbols:
810  */
811 void print_events(void)
812 {
813         struct event_symbol *syms = event_symbols;
814         unsigned int i, type, op, prev_type = -1;
815         char name[40];
816
817         printf("\n");
818         printf("List of pre-defined events (to be used in -e):\n");
819
820         for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
821                 type = syms->type + 1;
822                 if (type >= ARRAY_SIZE(event_type_descriptors))
823                         type = 0;
824
825                 if (type != prev_type)
826                         printf("\n");
827
828                 if (strlen(syms->alias))
829                         sprintf(name, "%s OR %s", syms->symbol, syms->alias);
830                 else
831                         strcpy(name, syms->symbol);
832                 printf("  %-42s [%s]\n", name,
833                         event_type_descriptors[type]);
834
835                 prev_type = type;
836         }
837
838         printf("\n");
839         for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
840                 for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
841                         /* skip invalid cache type */
842                         if (!is_cache_op_valid(type, op))
843                                 continue;
844
845                         for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
846                                 printf("  %-42s [%s]\n",
847                                         event_cache_name(type, op, i),
848                                         event_type_descriptors[4]);
849                         }
850                 }
851         }
852
853         printf("\n");
854         printf("  %-42s [raw hardware event descriptor]\n",
855                 "rNNN");
856         printf("\n");
857
858         print_tracepoint_events();
859
860         exit(129);
861 }