perf tools: Fix buffer overflow error when specifying all tracepoints
[linux-2.6.git] / tools / perf / util / parse-events.c
1 #include "../../../include/linux/hw_breakpoint.h"
2 #include "util.h"
3 #include "../perf.h"
4 #include "evsel.h"
5 #include "parse-options.h"
6 #include "parse-events.h"
7 #include "exec_cmd.h"
8 #include "string.h"
9 #include "symbol.h"
10 #include "cache.h"
11 #include "header.h"
12 #include "debugfs.h"
13
14 int                             nr_counters;
15
16 LIST_HEAD(evsel_list);
17
18 struct event_symbol {
19         u8              type;
20         u64             config;
21         const char      *symbol;
22         const char      *alias;
23 };
24
25 enum event_result {
26         EVT_FAILED,
27         EVT_HANDLED,
28         EVT_HANDLED_ALL
29 };
30
31 char debugfs_path[MAXPATHLEN];
32
33 #define CHW(x) .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_##x
34 #define CSW(x) .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_##x
35
36 static struct event_symbol event_symbols[] = {
37   { CHW(CPU_CYCLES),            "cpu-cycles",           "cycles"        },
38   { CHW(INSTRUCTIONS),          "instructions",         ""              },
39   { CHW(CACHE_REFERENCES),      "cache-references",     ""              },
40   { CHW(CACHE_MISSES),          "cache-misses",         ""              },
41   { CHW(BRANCH_INSTRUCTIONS),   "branch-instructions",  "branches"      },
42   { CHW(BRANCH_MISSES),         "branch-misses",        ""              },
43   { CHW(BUS_CYCLES),            "bus-cycles",           ""              },
44
45   { CSW(CPU_CLOCK),             "cpu-clock",            ""              },
46   { CSW(TASK_CLOCK),            "task-clock",           ""              },
47   { CSW(PAGE_FAULTS),           "page-faults",          "faults"        },
48   { CSW(PAGE_FAULTS_MIN),       "minor-faults",         ""              },
49   { CSW(PAGE_FAULTS_MAJ),       "major-faults",         ""              },
50   { CSW(CONTEXT_SWITCHES),      "context-switches",     "cs"            },
51   { CSW(CPU_MIGRATIONS),        "cpu-migrations",       "migrations"    },
52   { CSW(ALIGNMENT_FAULTS),      "alignment-faults",     ""              },
53   { CSW(EMULATION_FAULTS),      "emulation-faults",     ""              },
54 };
55
56 #define __PERF_EVENT_FIELD(config, name) \
57         ((config & PERF_EVENT_##name##_MASK) >> PERF_EVENT_##name##_SHIFT)
58
59 #define PERF_EVENT_RAW(config)  __PERF_EVENT_FIELD(config, RAW)
60 #define PERF_EVENT_CONFIG(config)       __PERF_EVENT_FIELD(config, CONFIG)
61 #define PERF_EVENT_TYPE(config) __PERF_EVENT_FIELD(config, TYPE)
62 #define PERF_EVENT_ID(config)           __PERF_EVENT_FIELD(config, EVENT)
63
64 static const char *hw_event_names[] = {
65         "cycles",
66         "instructions",
67         "cache-references",
68         "cache-misses",
69         "branches",
70         "branch-misses",
71         "bus-cycles",
72 };
73
74 static const char *sw_event_names[] = {
75         "cpu-clock-msecs",
76         "task-clock-msecs",
77         "page-faults",
78         "context-switches",
79         "CPU-migrations",
80         "minor-faults",
81         "major-faults",
82         "alignment-faults",
83         "emulation-faults",
84 };
85
86 #define MAX_ALIASES 8
87
88 static const char *hw_cache[][MAX_ALIASES] = {
89  { "L1-dcache", "l1-d",         "l1d",          "L1-data",              },
90  { "L1-icache", "l1-i",         "l1i",          "L1-instruction",       },
91  { "LLC",       "L2"                                                    },
92  { "dTLB",      "d-tlb",        "Data-TLB",                             },
93  { "iTLB",      "i-tlb",        "Instruction-TLB",                      },
94  { "branch",    "branches",     "bpu",          "btb",          "bpc",  },
95 };
96
97 static const char *hw_cache_op[][MAX_ALIASES] = {
98  { "load",      "loads",        "read",                                 },
99  { "store",     "stores",       "write",                                },
100  { "prefetch",  "prefetches",   "speculative-read", "speculative-load", },
101 };
102
103 static const char *hw_cache_result[][MAX_ALIASES] = {
104  { "refs",      "Reference",    "ops",          "access",               },
105  { "misses",    "miss",                                                 },
106 };
107
108 #define C(x)            PERF_COUNT_HW_CACHE_##x
109 #define CACHE_READ      (1 << C(OP_READ))
110 #define CACHE_WRITE     (1 << C(OP_WRITE))
111 #define CACHE_PREFETCH  (1 << C(OP_PREFETCH))
112 #define COP(x)          (1 << x)
113
114 /*
115  * cache operartion stat
116  * L1I : Read and prefetch only
117  * ITLB and BPU : Read-only
118  */
119 static unsigned long hw_cache_stat[C(MAX)] = {
120  [C(L1D)]       = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
121  [C(L1I)]       = (CACHE_READ | CACHE_PREFETCH),
122  [C(LL)]        = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
123  [C(DTLB)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
124  [C(ITLB)]      = (CACHE_READ),
125  [C(BPU)]       = (CACHE_READ),
126 };
127
128 #define for_each_subsystem(sys_dir, sys_dirent, sys_next)              \
129         while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next)        \
130         if (sys_dirent.d_type == DT_DIR &&                                     \
131            (strcmp(sys_dirent.d_name, ".")) &&                                 \
132            (strcmp(sys_dirent.d_name, "..")))
133
134 static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
135 {
136         char evt_path[MAXPATHLEN];
137         int fd;
138
139         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
140                         sys_dir->d_name, evt_dir->d_name);
141         fd = open(evt_path, O_RDONLY);
142         if (fd < 0)
143                 return -EINVAL;
144         close(fd);
145
146         return 0;
147 }
148
149 #define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next)              \
150         while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next)        \
151         if (evt_dirent.d_type == DT_DIR &&                                     \
152            (strcmp(evt_dirent.d_name, ".")) &&                                 \
153            (strcmp(evt_dirent.d_name, "..")) &&                                \
154            (!tp_event_has_id(&sys_dirent, &evt_dirent)))
155
156 #define MAX_EVENT_LENGTH 512
157
158
159 struct tracepoint_path *tracepoint_id_to_path(u64 config)
160 {
161         struct tracepoint_path *path = NULL;
162         DIR *sys_dir, *evt_dir;
163         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
164         char id_buf[4];
165         int fd;
166         u64 id;
167         char evt_path[MAXPATHLEN];
168         char dir_path[MAXPATHLEN];
169
170         if (debugfs_valid_mountpoint(debugfs_path))
171                 return NULL;
172
173         sys_dir = opendir(debugfs_path);
174         if (!sys_dir)
175                 return NULL;
176
177         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
178
179                 snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
180                          sys_dirent.d_name);
181                 evt_dir = opendir(dir_path);
182                 if (!evt_dir)
183                         continue;
184
185                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
186
187                         snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
188                                  evt_dirent.d_name);
189                         fd = open(evt_path, O_RDONLY);
190                         if (fd < 0)
191                                 continue;
192                         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
193                                 close(fd);
194                                 continue;
195                         }
196                         close(fd);
197                         id = atoll(id_buf);
198                         if (id == config) {
199                                 closedir(evt_dir);
200                                 closedir(sys_dir);
201                                 path = zalloc(sizeof(*path));
202                                 path->system = malloc(MAX_EVENT_LENGTH);
203                                 if (!path->system) {
204                                         free(path);
205                                         return NULL;
206                                 }
207                                 path->name = malloc(MAX_EVENT_LENGTH);
208                                 if (!path->name) {
209                                         free(path->system);
210                                         free(path);
211                                         return NULL;
212                                 }
213                                 strncpy(path->system, sys_dirent.d_name,
214                                         MAX_EVENT_LENGTH);
215                                 strncpy(path->name, evt_dirent.d_name,
216                                         MAX_EVENT_LENGTH);
217                                 return path;
218                         }
219                 }
220                 closedir(evt_dir);
221         }
222
223         closedir(sys_dir);
224         return NULL;
225 }
226
227 #define TP_PATH_LEN (MAX_EVENT_LENGTH * 2 + 1)
228 static const char *tracepoint_id_to_name(u64 config)
229 {
230         static char buf[TP_PATH_LEN];
231         struct tracepoint_path *path;
232
233         path = tracepoint_id_to_path(config);
234         if (path) {
235                 snprintf(buf, TP_PATH_LEN, "%s:%s", path->system, path->name);
236                 free(path->name);
237                 free(path->system);
238                 free(path);
239         } else
240                 snprintf(buf, TP_PATH_LEN, "%s:%s", "unknown", "unknown");
241
242         return buf;
243 }
244
245 static int is_cache_op_valid(u8 cache_type, u8 cache_op)
246 {
247         if (hw_cache_stat[cache_type] & COP(cache_op))
248                 return 1;       /* valid */
249         else
250                 return 0;       /* invalid */
251 }
252
253 static char *event_cache_name(u8 cache_type, u8 cache_op, u8 cache_result)
254 {
255         static char name[50];
256
257         if (cache_result) {
258                 sprintf(name, "%s-%s-%s", hw_cache[cache_type][0],
259                         hw_cache_op[cache_op][0],
260                         hw_cache_result[cache_result][0]);
261         } else {
262                 sprintf(name, "%s-%s", hw_cache[cache_type][0],
263                         hw_cache_op[cache_op][1]);
264         }
265
266         return name;
267 }
268
269 const char *event_name(struct perf_evsel *evsel)
270 {
271         u64 config = evsel->attr.config;
272         int type = evsel->attr.type;
273
274         return __event_name(type, config);
275 }
276
277 const char *__event_name(int type, u64 config)
278 {
279         static char buf[32];
280
281         if (type == PERF_TYPE_RAW) {
282                 sprintf(buf, "raw 0x%llx", config);
283                 return buf;
284         }
285
286         switch (type) {
287         case PERF_TYPE_HARDWARE:
288                 if (config < PERF_COUNT_HW_MAX)
289                         return hw_event_names[config];
290                 return "unknown-hardware";
291
292         case PERF_TYPE_HW_CACHE: {
293                 u8 cache_type, cache_op, cache_result;
294
295                 cache_type   = (config >>  0) & 0xff;
296                 if (cache_type > PERF_COUNT_HW_CACHE_MAX)
297                         return "unknown-ext-hardware-cache-type";
298
299                 cache_op     = (config >>  8) & 0xff;
300                 if (cache_op > PERF_COUNT_HW_CACHE_OP_MAX)
301                         return "unknown-ext-hardware-cache-op";
302
303                 cache_result = (config >> 16) & 0xff;
304                 if (cache_result > PERF_COUNT_HW_CACHE_RESULT_MAX)
305                         return "unknown-ext-hardware-cache-result";
306
307                 if (!is_cache_op_valid(cache_type, cache_op))
308                         return "invalid-cache";
309
310                 return event_cache_name(cache_type, cache_op, cache_result);
311         }
312
313         case PERF_TYPE_SOFTWARE:
314                 if (config < PERF_COUNT_SW_MAX)
315                         return sw_event_names[config];
316                 return "unknown-software";
317
318         case PERF_TYPE_TRACEPOINT:
319                 return tracepoint_id_to_name(config);
320
321         default:
322                 break;
323         }
324
325         return "unknown";
326 }
327
328 static int parse_aliases(const char **str, const char *names[][MAX_ALIASES], int size)
329 {
330         int i, j;
331         int n, longest = -1;
332
333         for (i = 0; i < size; i++) {
334                 for (j = 0; j < MAX_ALIASES && names[i][j]; j++) {
335                         n = strlen(names[i][j]);
336                         if (n > longest && !strncasecmp(*str, names[i][j], n))
337                                 longest = n;
338                 }
339                 if (longest > 0) {
340                         *str += longest;
341                         return i;
342                 }
343         }
344
345         return -1;
346 }
347
348 static enum event_result
349 parse_generic_hw_event(const char **str, struct perf_event_attr *attr)
350 {
351         const char *s = *str;
352         int cache_type = -1, cache_op = -1, cache_result = -1;
353
354         cache_type = parse_aliases(&s, hw_cache, PERF_COUNT_HW_CACHE_MAX);
355         /*
356          * No fallback - if we cannot get a clear cache type
357          * then bail out:
358          */
359         if (cache_type == -1)
360                 return EVT_FAILED;
361
362         while ((cache_op == -1 || cache_result == -1) && *s == '-') {
363                 ++s;
364
365                 if (cache_op == -1) {
366                         cache_op = parse_aliases(&s, hw_cache_op,
367                                                 PERF_COUNT_HW_CACHE_OP_MAX);
368                         if (cache_op >= 0) {
369                                 if (!is_cache_op_valid(cache_type, cache_op))
370                                         return 0;
371                                 continue;
372                         }
373                 }
374
375                 if (cache_result == -1) {
376                         cache_result = parse_aliases(&s, hw_cache_result,
377                                                 PERF_COUNT_HW_CACHE_RESULT_MAX);
378                         if (cache_result >= 0)
379                                 continue;
380                 }
381
382                 /*
383                  * Can't parse this as a cache op or result, so back up
384                  * to the '-'.
385                  */
386                 --s;
387                 break;
388         }
389
390         /*
391          * Fall back to reads:
392          */
393         if (cache_op == -1)
394                 cache_op = PERF_COUNT_HW_CACHE_OP_READ;
395
396         /*
397          * Fall back to accesses:
398          */
399         if (cache_result == -1)
400                 cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;
401
402         attr->config = cache_type | (cache_op << 8) | (cache_result << 16);
403         attr->type = PERF_TYPE_HW_CACHE;
404
405         *str = s;
406         return EVT_HANDLED;
407 }
408
409 static enum event_result
410 parse_single_tracepoint_event(char *sys_name,
411                               const char *evt_name,
412                               unsigned int evt_length,
413                               struct perf_event_attr *attr,
414                               const char **strp)
415 {
416         char evt_path[MAXPATHLEN];
417         char id_buf[4];
418         u64 id;
419         int fd;
420
421         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
422                  sys_name, evt_name);
423
424         fd = open(evt_path, O_RDONLY);
425         if (fd < 0)
426                 return EVT_FAILED;
427
428         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
429                 close(fd);
430                 return EVT_FAILED;
431         }
432
433         close(fd);
434         id = atoll(id_buf);
435         attr->config = id;
436         attr->type = PERF_TYPE_TRACEPOINT;
437         *strp += strlen(sys_name) + evt_length + 1; /* + 1 for the ':' */
438
439         attr->sample_type |= PERF_SAMPLE_RAW;
440         attr->sample_type |= PERF_SAMPLE_TIME;
441         attr->sample_type |= PERF_SAMPLE_CPU;
442
443         attr->sample_period = 1;
444
445
446         return EVT_HANDLED;
447 }
448
449 /* sys + ':' + event + ':' + flags*/
450 #define MAX_EVOPT_LEN   (MAX_EVENT_LENGTH * 2 + 2 + 128)
451 static enum event_result
452 parse_multiple_tracepoint_event(char *sys_name, const char *evt_exp,
453                                 char *flags)
454 {
455         char evt_path[MAXPATHLEN];
456         struct dirent *evt_ent;
457         DIR *evt_dir;
458
459         snprintf(evt_path, MAXPATHLEN, "%s/%s", debugfs_path, sys_name);
460         evt_dir = opendir(evt_path);
461
462         if (!evt_dir) {
463                 perror("Can't open event dir");
464                 return EVT_FAILED;
465         }
466
467         while ((evt_ent = readdir(evt_dir))) {
468                 char event_opt[MAX_EVOPT_LEN + 1];
469                 int len;
470
471                 if (!strcmp(evt_ent->d_name, ".")
472                     || !strcmp(evt_ent->d_name, "..")
473                     || !strcmp(evt_ent->d_name, "enable")
474                     || !strcmp(evt_ent->d_name, "filter"))
475                         continue;
476
477                 if (!strglobmatch(evt_ent->d_name, evt_exp))
478                         continue;
479
480                 len = snprintf(event_opt, MAX_EVOPT_LEN, "%s:%s%s%s", sys_name,
481                                evt_ent->d_name, flags ? ":" : "",
482                                flags ?: "");
483                 if (len < 0)
484                         return EVT_FAILED;
485
486                 if (parse_events(NULL, event_opt, 0))
487                         return EVT_FAILED;
488         }
489
490         return EVT_HANDLED_ALL;
491 }
492
493 static int store_event_type(const char *orgname)
494 {
495         char filename[PATH_MAX], *c;
496         FILE *file;
497         int id, n;
498
499         sprintf(filename, "%s/", debugfs_path);
500         strncat(filename, orgname, strlen(orgname));
501         strcat(filename, "/id");
502
503         c = strchr(filename, ':');
504         if (c)
505                 *c = '/';
506
507         file = fopen(filename, "r");
508         if (!file)
509                 return 0;
510         n = fscanf(file, "%i", &id);
511         fclose(file);
512         if (n < 1) {
513                 pr_err("cannot store event ID\n");
514                 return -EINVAL;
515         }
516         return perf_header__push_event(id, orgname);
517 }
518
519 static enum event_result parse_tracepoint_event(const char **strp,
520                                     struct perf_event_attr *attr)
521 {
522         const char *evt_name;
523         char *flags = NULL, *comma_loc;
524         char sys_name[MAX_EVENT_LENGTH];
525         unsigned int sys_length, evt_length;
526
527         if (debugfs_valid_mountpoint(debugfs_path))
528                 return 0;
529
530         evt_name = strchr(*strp, ':');
531         if (!evt_name)
532                 return EVT_FAILED;
533
534         sys_length = evt_name - *strp;
535         if (sys_length >= MAX_EVENT_LENGTH)
536                 return 0;
537
538         strncpy(sys_name, *strp, sys_length);
539         sys_name[sys_length] = '\0';
540         evt_name = evt_name + 1;
541
542         comma_loc = strchr(evt_name, ',');
543         if (comma_loc) {
544                 /* take the event name up to the comma */
545                 evt_name = strndup(evt_name, comma_loc - evt_name);
546         }
547         flags = strchr(evt_name, ':');
548         if (flags) {
549                 /* split it out: */
550                 evt_name = strndup(evt_name, flags - evt_name);
551                 flags++;
552         }
553
554         evt_length = strlen(evt_name);
555         if (evt_length >= MAX_EVENT_LENGTH)
556                 return EVT_FAILED;
557         if (strpbrk(evt_name, "*?")) {
558                 *strp += strlen(sys_name) + evt_length;
559                 return parse_multiple_tracepoint_event(sys_name, evt_name,
560                                                        flags);
561         } else {
562                 if (store_event_type(evt_name) < 0)
563                         return EVT_FAILED;
564
565                 return parse_single_tracepoint_event(sys_name, evt_name,
566                                                      evt_length, attr, strp);
567         }
568 }
569
570 static enum event_result
571 parse_breakpoint_type(const char *type, const char **strp,
572                       struct perf_event_attr *attr)
573 {
574         int i;
575
576         for (i = 0; i < 3; i++) {
577                 if (!type[i])
578                         break;
579
580                 switch (type[i]) {
581                 case 'r':
582                         attr->bp_type |= HW_BREAKPOINT_R;
583                         break;
584                 case 'w':
585                         attr->bp_type |= HW_BREAKPOINT_W;
586                         break;
587                 case 'x':
588                         attr->bp_type |= HW_BREAKPOINT_X;
589                         break;
590                 default:
591                         return EVT_FAILED;
592                 }
593         }
594         if (!attr->bp_type) /* Default */
595                 attr->bp_type = HW_BREAKPOINT_R | HW_BREAKPOINT_W;
596
597         *strp = type + i;
598
599         return EVT_HANDLED;
600 }
601
602 static enum event_result
603 parse_breakpoint_event(const char **strp, struct perf_event_attr *attr)
604 {
605         const char *target;
606         const char *type;
607         char *endaddr;
608         u64 addr;
609         enum event_result err;
610
611         target = strchr(*strp, ':');
612         if (!target)
613                 return EVT_FAILED;
614
615         if (strncmp(*strp, "mem", target - *strp) != 0)
616                 return EVT_FAILED;
617
618         target++;
619
620         addr = strtoull(target, &endaddr, 0);
621         if (target == endaddr)
622                 return EVT_FAILED;
623
624         attr->bp_addr = addr;
625         *strp = endaddr;
626
627         type = strchr(target, ':');
628
629         /* If no type is defined, just rw as default */
630         if (!type) {
631                 attr->bp_type = HW_BREAKPOINT_R | HW_BREAKPOINT_W;
632         } else {
633                 err = parse_breakpoint_type(++type, strp, attr);
634                 if (err == EVT_FAILED)
635                         return EVT_FAILED;
636         }
637
638         /*
639          * We should find a nice way to override the access length
640          * Provide some defaults for now
641          */
642         if (attr->bp_type == HW_BREAKPOINT_X)
643                 attr->bp_len = sizeof(long);
644         else
645                 attr->bp_len = HW_BREAKPOINT_LEN_4;
646
647         attr->type = PERF_TYPE_BREAKPOINT;
648
649         return EVT_HANDLED;
650 }
651
652 static int check_events(const char *str, unsigned int i)
653 {
654         int n;
655
656         n = strlen(event_symbols[i].symbol);
657         if (!strncmp(str, event_symbols[i].symbol, n))
658                 return n;
659
660         n = strlen(event_symbols[i].alias);
661         if (n)
662                 if (!strncmp(str, event_symbols[i].alias, n))
663                         return n;
664         return 0;
665 }
666
667 static enum event_result
668 parse_symbolic_event(const char **strp, struct perf_event_attr *attr)
669 {
670         const char *str = *strp;
671         unsigned int i;
672         int n;
673
674         for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
675                 n = check_events(str, i);
676                 if (n > 0) {
677                         attr->type = event_symbols[i].type;
678                         attr->config = event_symbols[i].config;
679                         *strp = str + n;
680                         return EVT_HANDLED;
681                 }
682         }
683         return EVT_FAILED;
684 }
685
686 static enum event_result
687 parse_raw_event(const char **strp, struct perf_event_attr *attr)
688 {
689         const char *str = *strp;
690         u64 config;
691         int n;
692
693         if (*str != 'r')
694                 return EVT_FAILED;
695         n = hex2u64(str + 1, &config);
696         if (n > 0) {
697                 *strp = str + n + 1;
698                 attr->type = PERF_TYPE_RAW;
699                 attr->config = config;
700                 return EVT_HANDLED;
701         }
702         return EVT_FAILED;
703 }
704
705 static enum event_result
706 parse_numeric_event(const char **strp, struct perf_event_attr *attr)
707 {
708         const char *str = *strp;
709         char *endp;
710         unsigned long type;
711         u64 config;
712
713         type = strtoul(str, &endp, 0);
714         if (endp > str && type < PERF_TYPE_MAX && *endp == ':') {
715                 str = endp + 1;
716                 config = strtoul(str, &endp, 0);
717                 if (endp > str) {
718                         attr->type = type;
719                         attr->config = config;
720                         *strp = endp;
721                         return EVT_HANDLED;
722                 }
723         }
724         return EVT_FAILED;
725 }
726
727 static enum event_result
728 parse_event_modifier(const char **strp, struct perf_event_attr *attr)
729 {
730         const char *str = *strp;
731         int exclude = 0;
732         int eu = 0, ek = 0, eh = 0, precise = 0;
733
734         if (*str++ != ':')
735                 return 0;
736         while (*str) {
737                 if (*str == 'u') {
738                         if (!exclude)
739                                 exclude = eu = ek = eh = 1;
740                         eu = 0;
741                 } else if (*str == 'k') {
742                         if (!exclude)
743                                 exclude = eu = ek = eh = 1;
744                         ek = 0;
745                 } else if (*str == 'h') {
746                         if (!exclude)
747                                 exclude = eu = ek = eh = 1;
748                         eh = 0;
749                 } else if (*str == 'p') {
750                         precise++;
751                 } else
752                         break;
753
754                 ++str;
755         }
756         if (str >= *strp + 2) {
757                 *strp = str;
758                 attr->exclude_user   = eu;
759                 attr->exclude_kernel = ek;
760                 attr->exclude_hv     = eh;
761                 attr->precise_ip     = precise;
762                 return 1;
763         }
764         return 0;
765 }
766
767 /*
768  * Each event can have multiple symbolic names.
769  * Symbolic names are (almost) exactly matched.
770  */
771 static enum event_result
772 parse_event_symbols(const char **str, struct perf_event_attr *attr)
773 {
774         enum event_result ret;
775
776         ret = parse_tracepoint_event(str, attr);
777         if (ret != EVT_FAILED)
778                 goto modifier;
779
780         ret = parse_raw_event(str, attr);
781         if (ret != EVT_FAILED)
782                 goto modifier;
783
784         ret = parse_numeric_event(str, attr);
785         if (ret != EVT_FAILED)
786                 goto modifier;
787
788         ret = parse_symbolic_event(str, attr);
789         if (ret != EVT_FAILED)
790                 goto modifier;
791
792         ret = parse_generic_hw_event(str, attr);
793         if (ret != EVT_FAILED)
794                 goto modifier;
795
796         ret = parse_breakpoint_event(str, attr);
797         if (ret != EVT_FAILED)
798                 goto modifier;
799
800         fprintf(stderr, "invalid or unsupported event: '%s'\n", *str);
801         fprintf(stderr, "Run 'perf list' for a list of valid events\n");
802         return EVT_FAILED;
803
804 modifier:
805         parse_event_modifier(str, attr);
806
807         return ret;
808 }
809
810 int parse_events(const struct option *opt __used, const char *str, int unset __used)
811 {
812         struct perf_event_attr attr;
813         enum event_result ret;
814
815         for (;;) {
816                 memset(&attr, 0, sizeof(attr));
817                 ret = parse_event_symbols(&str, &attr);
818                 if (ret == EVT_FAILED)
819                         return -1;
820
821                 if (!(*str == 0 || *str == ',' || isspace(*str)))
822                         return -1;
823
824                 if (ret != EVT_HANDLED_ALL) {
825                         struct perf_evsel *evsel;
826                         evsel = perf_evsel__new(attr.type, attr.config,
827                                                 nr_counters);
828                         if (evsel == NULL)
829                                 return -1;
830                         list_add_tail(&evsel->node, &evsel_list);
831                         ++nr_counters;
832                 }
833
834                 if (*str == 0)
835                         break;
836                 if (*str == ',')
837                         ++str;
838                 while (isspace(*str))
839                         ++str;
840         }
841
842         return 0;
843 }
844
845 int parse_filter(const struct option *opt __used, const char *str,
846                  int unset __used)
847 {
848         struct perf_evsel *last = NULL;
849
850         if (!list_empty(&evsel_list))
851                 last = list_entry(evsel_list.prev, struct perf_evsel, node);
852
853         if (last == NULL || last->attr.type != PERF_TYPE_TRACEPOINT) {
854                 fprintf(stderr,
855                         "-F option should follow a -e tracepoint option\n");
856                 return -1;
857         }
858
859         last->filter = strdup(str);
860         if (last->filter == NULL) {
861                 fprintf(stderr, "not enough memory to hold filter string\n");
862                 return -1;
863         }
864
865         return 0;
866 }
867
868 static const char * const event_type_descriptors[] = {
869         "Hardware event",
870         "Software event",
871         "Tracepoint event",
872         "Hardware cache event",
873         "Raw hardware event descriptor",
874         "Hardware breakpoint",
875 };
876
877 /*
878  * Print the events from <debugfs_mount_point>/tracing/events
879  */
880
881 static void print_tracepoint_events(void)
882 {
883         DIR *sys_dir, *evt_dir;
884         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
885         char evt_path[MAXPATHLEN];
886         char dir_path[MAXPATHLEN];
887
888         if (debugfs_valid_mountpoint(debugfs_path))
889                 return;
890
891         sys_dir = opendir(debugfs_path);
892         if (!sys_dir)
893                 return;
894
895         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
896
897                 snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
898                          sys_dirent.d_name);
899                 evt_dir = opendir(dir_path);
900                 if (!evt_dir)
901                         continue;
902
903                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
904                         snprintf(evt_path, MAXPATHLEN, "%s:%s",
905                                  sys_dirent.d_name, evt_dirent.d_name);
906                         printf("  %-42s [%s]\n", evt_path,
907                                 event_type_descriptors[PERF_TYPE_TRACEPOINT]);
908                 }
909                 closedir(evt_dir);
910         }
911         closedir(sys_dir);
912 }
913
914 /*
915  * Check whether event is in <debugfs_mount_point>/tracing/events
916  */
917
918 int is_valid_tracepoint(const char *event_string)
919 {
920         DIR *sys_dir, *evt_dir;
921         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
922         char evt_path[MAXPATHLEN];
923         char dir_path[MAXPATHLEN];
924
925         if (debugfs_valid_mountpoint(debugfs_path))
926                 return 0;
927
928         sys_dir = opendir(debugfs_path);
929         if (!sys_dir)
930                 return 0;
931
932         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
933
934                 snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
935                          sys_dirent.d_name);
936                 evt_dir = opendir(dir_path);
937                 if (!evt_dir)
938                         continue;
939
940                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
941                         snprintf(evt_path, MAXPATHLEN, "%s:%s",
942                                  sys_dirent.d_name, evt_dirent.d_name);
943                         if (!strcmp(evt_path, event_string)) {
944                                 closedir(evt_dir);
945                                 closedir(sys_dir);
946                                 return 1;
947                         }
948                 }
949                 closedir(evt_dir);
950         }
951         closedir(sys_dir);
952         return 0;
953 }
954
955 /*
956  * Print the help text for the event symbols:
957  */
958 void print_events(void)
959 {
960         struct event_symbol *syms = event_symbols;
961         unsigned int i, type, op, prev_type = -1;
962         char name[40];
963
964         printf("\n");
965         printf("List of pre-defined events (to be used in -e):\n");
966
967         for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
968                 type = syms->type;
969
970                 if (type != prev_type)
971                         printf("\n");
972
973                 if (strlen(syms->alias))
974                         sprintf(name, "%s OR %s", syms->symbol, syms->alias);
975                 else
976                         strcpy(name, syms->symbol);
977                 printf("  %-42s [%s]\n", name,
978                         event_type_descriptors[type]);
979
980                 prev_type = type;
981         }
982
983         printf("\n");
984         for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
985                 for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
986                         /* skip invalid cache type */
987                         if (!is_cache_op_valid(type, op))
988                                 continue;
989
990                         for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
991                                 printf("  %-42s [%s]\n",
992                                         event_cache_name(type, op, i),
993                                         event_type_descriptors[PERF_TYPE_HW_CACHE]);
994                         }
995                 }
996         }
997
998         printf("\n");
999         printf("  %-42s [%s]\n",
1000                 "rNNN (see 'perf list --help' on how to encode it)",
1001                event_type_descriptors[PERF_TYPE_RAW]);
1002         printf("\n");
1003
1004         printf("  %-42s [%s]\n",
1005                         "mem:<addr>[:access]",
1006                         event_type_descriptors[PERF_TYPE_BREAKPOINT]);
1007         printf("\n");
1008
1009         print_tracepoint_events();
1010
1011         exit(129);
1012 }
1013
1014 int perf_evsel_list__create_default(void)
1015 {
1016         struct perf_evsel *evsel = perf_evsel__new(PERF_TYPE_HARDWARE,
1017                                                    PERF_COUNT_HW_CPU_CYCLES, 0);
1018         if (evsel == NULL)
1019                 return -ENOMEM;
1020
1021         list_add(&evsel->node, &evsel_list);
1022         ++nr_counters;
1023         return 0;
1024 }
1025
1026 void perf_evsel_list__delete(void)
1027 {
1028         struct perf_evsel *pos, *n;
1029
1030         list_for_each_entry_safe(pos, n, &evsel_list, node) {
1031                 list_del_init(&pos->node);
1032                 perf_evsel__delete(pos);
1033         }
1034         nr_counters = 0;
1035 }