Commit | Line | Data |
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50656eec MH |
1 | /* |
2 | * probe-event.c : perf-probe definition to kprobe_events format converter | |
3 | * | |
4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | */ | |
21 | ||
22 | #define _GNU_SOURCE | |
23 | #include <sys/utsname.h> | |
24 | #include <sys/types.h> | |
25 | #include <sys/stat.h> | |
26 | #include <fcntl.h> | |
27 | #include <errno.h> | |
28 | #include <stdio.h> | |
29 | #include <unistd.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
4de189fe MH |
32 | #include <stdarg.h> |
33 | #include <limits.h> | |
50656eec MH |
34 | |
35 | #undef _GNU_SOURCE | |
36 | #include "event.h" | |
e1c01d61 | 37 | #include "string.h" |
4de189fe | 38 | #include "strlist.h" |
50656eec MH |
39 | #include "debug.h" |
40 | #include "parse-events.h" /* For debugfs_path */ | |
41 | #include "probe-event.h" | |
42 | ||
43 | #define MAX_CMDLEN 256 | |
44 | #define MAX_PROBE_ARGS 128 | |
45 | #define PERFPROBE_GROUP "probe" | |
46 | ||
47 | #define semantic_error(msg ...) die("Semantic error :" msg) | |
48 | ||
4de189fe | 49 | /* If there is no space to write, returns -E2BIG. */ |
84988450 MH |
50 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
51 | __attribute__((format(printf, 3, 4))); | |
52 | ||
4de189fe MH |
53 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
54 | { | |
55 | int ret; | |
56 | va_list ap; | |
57 | va_start(ap, format); | |
58 | ret = vsnprintf(str, size, format, ap); | |
59 | va_end(ap); | |
60 | if (ret >= (int)size) | |
61 | ret = -E2BIG; | |
62 | return ret; | |
63 | } | |
64 | ||
50656eec MH |
65 | /* Parse probepoint definition. */ |
66 | static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp) | |
67 | { | |
68 | char *ptr, *tmp; | |
69 | char c, nc = 0; | |
70 | /* | |
71 | * <Syntax> | |
af663d75 MH |
72 | * perf probe [EVENT=]SRC:LN |
73 | * perf probe [EVENT=]FUNC[+OFFS|%return][@SRC] | |
74 | * | |
75 | * TODO:Group name support | |
50656eec MH |
76 | */ |
77 | ||
af663d75 MH |
78 | ptr = strchr(arg, '='); |
79 | if (ptr) { /* Event name */ | |
80 | *ptr = '\0'; | |
81 | tmp = ptr + 1; | |
82 | ptr = strchr(arg, ':'); | |
83 | if (ptr) /* Group name is not supported yet. */ | |
84 | semantic_error("Group name is not supported yet."); | |
85 | pp->event = strdup(arg); | |
86 | arg = tmp; | |
87 | } | |
88 | ||
50656eec MH |
89 | ptr = strpbrk(arg, ":+@%"); |
90 | if (ptr) { | |
91 | nc = *ptr; | |
92 | *ptr++ = '\0'; | |
93 | } | |
94 | ||
95 | /* Check arg is function or file and copy it */ | |
96 | if (strchr(arg, '.')) /* File */ | |
97 | pp->file = strdup(arg); | |
98 | else /* Function */ | |
99 | pp->function = strdup(arg); | |
100 | DIE_IF(pp->file == NULL && pp->function == NULL); | |
101 | ||
102 | /* Parse other options */ | |
103 | while (ptr) { | |
104 | arg = ptr; | |
105 | c = nc; | |
106 | ptr = strpbrk(arg, ":+@%"); | |
107 | if (ptr) { | |
108 | nc = *ptr; | |
109 | *ptr++ = '\0'; | |
110 | } | |
111 | switch (c) { | |
112 | case ':': /* Line number */ | |
113 | pp->line = strtoul(arg, &tmp, 0); | |
114 | if (*tmp != '\0') | |
115 | semantic_error("There is non-digit charactor" | |
116 | " in line number."); | |
117 | break; | |
118 | case '+': /* Byte offset from a symbol */ | |
119 | pp->offset = strtoul(arg, &tmp, 0); | |
120 | if (*tmp != '\0') | |
121 | semantic_error("There is non-digit charactor" | |
122 | " in offset."); | |
123 | break; | |
124 | case '@': /* File name */ | |
125 | if (pp->file) | |
126 | semantic_error("SRC@SRC is not allowed."); | |
127 | pp->file = strdup(arg); | |
128 | DIE_IF(pp->file == NULL); | |
129 | if (ptr) | |
130 | semantic_error("@SRC must be the last " | |
131 | "option."); | |
132 | break; | |
133 | case '%': /* Probe places */ | |
134 | if (strcmp(arg, "return") == 0) { | |
135 | pp->retprobe = 1; | |
136 | } else /* Others not supported yet */ | |
137 | semantic_error("%%%s is not supported.", arg); | |
138 | break; | |
139 | default: | |
140 | DIE_IF("Program has a bug."); | |
141 | break; | |
142 | } | |
143 | } | |
144 | ||
145 | /* Exclusion check */ | |
146 | if (pp->line && pp->offset) | |
147 | semantic_error("Offset can't be used with line number."); | |
148 | ||
149 | if (!pp->line && pp->file && !pp->function) | |
150 | semantic_error("File always requires line number."); | |
151 | ||
152 | if (pp->offset && !pp->function) | |
153 | semantic_error("Offset requires an entry function."); | |
154 | ||
155 | if (pp->retprobe && !pp->function) | |
156 | semantic_error("Return probe requires an entry function."); | |
157 | ||
158 | if ((pp->offset || pp->line) && pp->retprobe) | |
159 | semantic_error("Offset/Line can't be used with return probe."); | |
160 | ||
161 | pr_debug("symbol:%s file:%s line:%d offset:%d, return:%d\n", | |
162 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe); | |
163 | } | |
164 | ||
165 | /* Parse perf-probe event definition */ | |
fac13fd5 MH |
166 | void parse_perf_probe_event(const char *str, struct probe_point *pp, |
167 | bool *need_dwarf) | |
50656eec | 168 | { |
e1c01d61 | 169 | char **argv; |
fac13fd5 MH |
170 | int argc, i; |
171 | ||
172 | *need_dwarf = false; | |
50656eec | 173 | |
e1c01d61 MH |
174 | argv = argv_split(str, &argc); |
175 | if (!argv) | |
176 | die("argv_split failed."); | |
177 | if (argc > MAX_PROBE_ARGS + 1) | |
178 | semantic_error("Too many arguments"); | |
50656eec MH |
179 | |
180 | /* Parse probe point */ | |
181 | parse_perf_probe_probepoint(argv[0], pp); | |
50656eec | 182 | if (pp->file || pp->line) |
fac13fd5 | 183 | *need_dwarf = true; |
50656eec | 184 | |
e1c01d61 | 185 | /* Copy arguments and ensure return probe has no C argument */ |
50656eec | 186 | pp->nr_args = argc - 1; |
e1c01d61 MH |
187 | pp->args = zalloc(sizeof(char *) * pp->nr_args); |
188 | for (i = 0; i < pp->nr_args; i++) { | |
189 | pp->args[i] = strdup(argv[i + 1]); | |
190 | if (!pp->args[i]) | |
191 | die("Failed to copy argument."); | |
50656eec MH |
192 | if (is_c_varname(pp->args[i])) { |
193 | if (pp->retprobe) | |
194 | semantic_error("You can't specify local" | |
195 | " variable for kretprobe"); | |
fac13fd5 | 196 | *need_dwarf = true; |
50656eec | 197 | } |
e1c01d61 | 198 | } |
50656eec | 199 | |
e1c01d61 | 200 | argv_free(argv); |
50656eec MH |
201 | } |
202 | ||
4de189fe | 203 | /* Parse kprobe_events event into struct probe_point */ |
af663d75 | 204 | void parse_trace_kprobe_event(const char *str, struct probe_point *pp) |
4de189fe MH |
205 | { |
206 | char pr; | |
207 | char *p; | |
208 | int ret, i, argc; | |
209 | char **argv; | |
210 | ||
211 | pr_debug("Parsing kprobe_events: %s\n", str); | |
212 | argv = argv_split(str, &argc); | |
213 | if (!argv) | |
214 | die("argv_split failed."); | |
215 | if (argc < 2) | |
216 | semantic_error("Too less arguments."); | |
217 | ||
218 | /* Scan event and group name. */ | |
93aaa45a | 219 | ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]", |
af663d75 MH |
220 | &pr, (float *)(void *)&pp->group, |
221 | (float *)(void *)&pp->event); | |
4de189fe MH |
222 | if (ret != 3) |
223 | semantic_error("Failed to parse event name: %s", argv[0]); | |
af663d75 | 224 | pr_debug("Group:%s Event:%s probe:%c\n", pp->group, pp->event, pr); |
4de189fe MH |
225 | |
226 | pp->retprobe = (pr == 'r'); | |
227 | ||
228 | /* Scan function name and offset */ | |
af663d75 MH |
229 | ret = sscanf(argv[1], "%a[^+]+%d", (float *)(void *)&pp->function, |
230 | &pp->offset); | |
4de189fe MH |
231 | if (ret == 1) |
232 | pp->offset = 0; | |
233 | ||
234 | /* kprobe_events doesn't have this information */ | |
235 | pp->line = 0; | |
236 | pp->file = NULL; | |
237 | ||
238 | pp->nr_args = argc - 2; | |
239 | pp->args = zalloc(sizeof(char *) * pp->nr_args); | |
240 | for (i = 0; i < pp->nr_args; i++) { | |
241 | p = strchr(argv[i + 2], '='); | |
242 | if (p) /* We don't need which register is assigned. */ | |
243 | *p = '\0'; | |
244 | pp->args[i] = strdup(argv[i + 2]); | |
245 | if (!pp->args[i]) | |
246 | die("Failed to copy argument."); | |
247 | } | |
248 | ||
4de189fe MH |
249 | argv_free(argv); |
250 | } | |
251 | ||
7ef17aaf MH |
252 | /* Synthesize only probe point (not argument) */ |
253 | int synthesize_perf_probe_point(struct probe_point *pp) | |
4de189fe MH |
254 | { |
255 | char *buf; | |
256 | char offs[64] = "", line[64] = ""; | |
7ef17aaf | 257 | int ret; |
4de189fe MH |
258 | |
259 | pp->probes[0] = buf = zalloc(MAX_CMDLEN); | |
260 | if (!buf) | |
261 | die("Failed to allocate memory by zalloc."); | |
262 | if (pp->offset) { | |
263 | ret = e_snprintf(offs, 64, "+%d", pp->offset); | |
264 | if (ret <= 0) | |
265 | goto error; | |
266 | } | |
267 | if (pp->line) { | |
268 | ret = e_snprintf(line, 64, ":%d", pp->line); | |
269 | if (ret <= 0) | |
270 | goto error; | |
271 | } | |
272 | ||
273 | if (pp->function) | |
274 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s", pp->function, | |
275 | offs, pp->retprobe ? "%return" : "", line); | |
276 | else | |
84988450 | 277 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", pp->file, line); |
7ef17aaf MH |
278 | if (ret <= 0) { |
279 | error: | |
280 | free(pp->probes[0]); | |
281 | pp->probes[0] = NULL; | |
282 | } | |
283 | return ret; | |
284 | } | |
285 | ||
286 | int synthesize_perf_probe_event(struct probe_point *pp) | |
287 | { | |
288 | char *buf; | |
289 | int i, len, ret; | |
290 | ||
291 | len = synthesize_perf_probe_point(pp); | |
292 | if (len < 0) | |
293 | return 0; | |
4de189fe | 294 | |
7ef17aaf | 295 | buf = pp->probes[0]; |
4de189fe MH |
296 | for (i = 0; i < pp->nr_args; i++) { |
297 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", | |
298 | pp->args[i]); | |
299 | if (ret <= 0) | |
300 | goto error; | |
301 | len += ret; | |
302 | } | |
303 | pp->found = 1; | |
304 | ||
305 | return pp->found; | |
306 | error: | |
307 | free(pp->probes[0]); | |
7ef17aaf | 308 | pp->probes[0] = NULL; |
4de189fe MH |
309 | |
310 | return ret; | |
311 | } | |
312 | ||
50656eec MH |
313 | int synthesize_trace_kprobe_event(struct probe_point *pp) |
314 | { | |
315 | char *buf; | |
316 | int i, len, ret; | |
317 | ||
318 | pp->probes[0] = buf = zalloc(MAX_CMDLEN); | |
319 | if (!buf) | |
320 | die("Failed to allocate memory by zalloc."); | |
4de189fe MH |
321 | ret = e_snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset); |
322 | if (ret <= 0) | |
50656eec MH |
323 | goto error; |
324 | len = ret; | |
325 | ||
326 | for (i = 0; i < pp->nr_args; i++) { | |
4de189fe MH |
327 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
328 | pp->args[i]); | |
329 | if (ret <= 0) | |
50656eec MH |
330 | goto error; |
331 | len += ret; | |
332 | } | |
333 | pp->found = 1; | |
334 | ||
335 | return pp->found; | |
336 | error: | |
337 | free(pp->probes[0]); | |
7ef17aaf | 338 | pp->probes[0] = NULL; |
50656eec MH |
339 | |
340 | return ret; | |
341 | } | |
342 | ||
4de189fe MH |
343 | static int open_kprobe_events(int flags, int mode) |
344 | { | |
345 | char buf[PATH_MAX]; | |
346 | int ret; | |
347 | ||
348 | ret = e_snprintf(buf, PATH_MAX, "%s/../kprobe_events", debugfs_path); | |
349 | if (ret < 0) | |
350 | die("Failed to make kprobe_events path."); | |
351 | ||
352 | ret = open(buf, flags, mode); | |
353 | if (ret < 0) { | |
354 | if (errno == ENOENT) | |
355 | die("kprobe_events file does not exist -" | |
356 | " please rebuild with CONFIG_KPROBE_TRACER."); | |
357 | else | |
358 | die("Could not open kprobe_events file: %s", | |
359 | strerror(errno)); | |
360 | } | |
361 | return ret; | |
362 | } | |
363 | ||
364 | /* Get raw string list of current kprobe_events */ | |
365 | static struct strlist *get_trace_kprobe_event_rawlist(int fd) | |
366 | { | |
367 | int ret, idx; | |
368 | FILE *fp; | |
369 | char buf[MAX_CMDLEN]; | |
370 | char *p; | |
371 | struct strlist *sl; | |
372 | ||
373 | sl = strlist__new(true, NULL); | |
374 | ||
375 | fp = fdopen(dup(fd), "r"); | |
376 | while (!feof(fp)) { | |
377 | p = fgets(buf, MAX_CMDLEN, fp); | |
378 | if (!p) | |
379 | break; | |
380 | ||
381 | idx = strlen(p) - 1; | |
382 | if (p[idx] == '\n') | |
383 | p[idx] = '\0'; | |
384 | ret = strlist__add(sl, buf); | |
385 | if (ret < 0) | |
386 | die("strlist__add failed: %s", strerror(-ret)); | |
387 | } | |
388 | fclose(fp); | |
389 | ||
390 | return sl; | |
391 | } | |
392 | ||
393 | /* Free and zero clear probe_point */ | |
394 | static void clear_probe_point(struct probe_point *pp) | |
395 | { | |
396 | int i; | |
397 | ||
af663d75 MH |
398 | if (pp->event) |
399 | free(pp->event); | |
400 | if (pp->group) | |
401 | free(pp->group); | |
4de189fe MH |
402 | if (pp->function) |
403 | free(pp->function); | |
404 | if (pp->file) | |
405 | free(pp->file); | |
406 | for (i = 0; i < pp->nr_args; i++) | |
407 | free(pp->args[i]); | |
408 | if (pp->args) | |
409 | free(pp->args); | |
410 | for (i = 0; i < pp->found; i++) | |
411 | free(pp->probes[i]); | |
5660ce34 | 412 | memset(pp, 0, sizeof(*pp)); |
4de189fe MH |
413 | } |
414 | ||
278498d4 | 415 | /* Show an event */ |
af663d75 MH |
416 | static void show_perf_probe_event(const char *event, const char *place, |
417 | struct probe_point *pp) | |
278498d4 | 418 | { |
7e990a51 | 419 | int i, ret; |
278498d4 MH |
420 | char buf[128]; |
421 | ||
af663d75 | 422 | ret = e_snprintf(buf, 128, "%s:%s", pp->group, event); |
7e990a51 MH |
423 | if (ret < 0) |
424 | die("Failed to copy event: %s", strerror(-ret)); | |
278498d4 MH |
425 | printf(" %-40s (on %s", buf, place); |
426 | ||
427 | if (pp->nr_args > 0) { | |
428 | printf(" with"); | |
429 | for (i = 0; i < pp->nr_args; i++) | |
430 | printf(" %s", pp->args[i]); | |
431 | } | |
432 | printf(")\n"); | |
433 | } | |
434 | ||
4de189fe MH |
435 | /* List up current perf-probe events */ |
436 | void show_perf_probe_events(void) | |
437 | { | |
7ef17aaf | 438 | int fd; |
4de189fe MH |
439 | struct probe_point pp; |
440 | struct strlist *rawlist; | |
441 | struct str_node *ent; | |
442 | ||
443 | fd = open_kprobe_events(O_RDONLY, 0); | |
444 | rawlist = get_trace_kprobe_event_rawlist(fd); | |
445 | close(fd); | |
446 | ||
adf365f4 | 447 | strlist__for_each(ent, rawlist) { |
af663d75 | 448 | parse_trace_kprobe_event(ent->s, &pp); |
278498d4 | 449 | /* Synthesize only event probe point */ |
7ef17aaf | 450 | synthesize_perf_probe_point(&pp); |
278498d4 | 451 | /* Show an event */ |
af663d75 | 452 | show_perf_probe_event(pp.event, pp.probes[0], &pp); |
4de189fe MH |
453 | clear_probe_point(&pp); |
454 | } | |
455 | ||
456 | strlist__delete(rawlist); | |
457 | } | |
458 | ||
b498ce1f | 459 | /* Get current perf-probe event names */ |
fa28244d | 460 | static struct strlist *get_perf_event_names(int fd, bool include_group) |
b498ce1f | 461 | { |
fa28244d | 462 | char buf[128]; |
b498ce1f MH |
463 | struct strlist *sl, *rawlist; |
464 | struct str_node *ent; | |
af663d75 | 465 | struct probe_point pp; |
b498ce1f | 466 | |
af663d75 | 467 | memset(&pp, 0, sizeof(pp)); |
b498ce1f MH |
468 | rawlist = get_trace_kprobe_event_rawlist(fd); |
469 | ||
e1d2017b | 470 | sl = strlist__new(true, NULL); |
adf365f4 | 471 | strlist__for_each(ent, rawlist) { |
af663d75 | 472 | parse_trace_kprobe_event(ent->s, &pp); |
fa28244d | 473 | if (include_group) { |
af663d75 MH |
474 | if (e_snprintf(buf, 128, "%s:%s", pp.group, |
475 | pp.event) < 0) | |
fa28244d MH |
476 | die("Failed to copy group:event name."); |
477 | strlist__add(sl, buf); | |
478 | } else | |
af663d75 MH |
479 | strlist__add(sl, pp.event); |
480 | clear_probe_point(&pp); | |
b498ce1f MH |
481 | } |
482 | ||
483 | strlist__delete(rawlist); | |
484 | ||
485 | return sl; | |
486 | } | |
487 | ||
a9b495b0 | 488 | static void write_trace_kprobe_event(int fd, const char *buf) |
50656eec MH |
489 | { |
490 | int ret; | |
491 | ||
fa28244d | 492 | pr_debug("Writing event: %s\n", buf); |
50656eec MH |
493 | ret = write(fd, buf, strlen(buf)); |
494 | if (ret <= 0) | |
fa28244d | 495 | die("Failed to write event: %s", strerror(errno)); |
50656eec MH |
496 | } |
497 | ||
b498ce1f | 498 | static void get_new_event_name(char *buf, size_t len, const char *base, |
d761b08b | 499 | struct strlist *namelist, bool allow_suffix) |
b498ce1f MH |
500 | { |
501 | int i, ret; | |
17f88fcd MH |
502 | |
503 | /* Try no suffix */ | |
504 | ret = e_snprintf(buf, len, "%s", base); | |
505 | if (ret < 0) | |
506 | die("snprintf() failed: %s", strerror(-ret)); | |
507 | if (!strlist__has_entry(namelist, buf)) | |
508 | return; | |
509 | ||
d761b08b MH |
510 | if (!allow_suffix) { |
511 | pr_warning("Error: event \"%s\" already exists. " | |
512 | "(Use -f to force duplicates.)\n", base); | |
513 | die("Can't add new event."); | |
514 | } | |
515 | ||
17f88fcd MH |
516 | /* Try to add suffix */ |
517 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
b498ce1f MH |
518 | ret = e_snprintf(buf, len, "%s_%d", base, i); |
519 | if (ret < 0) | |
520 | die("snprintf() failed: %s", strerror(-ret)); | |
521 | if (!strlist__has_entry(namelist, buf)) | |
522 | break; | |
523 | } | |
524 | if (i == MAX_EVENT_INDEX) | |
525 | die("Too many events are on the same function."); | |
526 | } | |
527 | ||
d761b08b MH |
528 | void add_trace_kprobe_events(struct probe_point *probes, int nr_probes, |
529 | bool force_add) | |
50656eec MH |
530 | { |
531 | int i, j, fd; | |
532 | struct probe_point *pp; | |
533 | char buf[MAX_CMDLEN]; | |
b498ce1f MH |
534 | char event[64]; |
535 | struct strlist *namelist; | |
d761b08b | 536 | bool allow_suffix; |
50656eec | 537 | |
b498ce1f MH |
538 | fd = open_kprobe_events(O_RDWR, O_APPEND); |
539 | /* Get current event names */ | |
fa28244d | 540 | namelist = get_perf_event_names(fd, false); |
50656eec MH |
541 | |
542 | for (j = 0; j < nr_probes; j++) { | |
543 | pp = probes + j; | |
af663d75 MH |
544 | if (!pp->event) |
545 | pp->event = strdup(pp->function); | |
546 | if (!pp->group) | |
547 | pp->group = strdup(PERFPROBE_GROUP); | |
548 | DIE_IF(!pp->event || !pp->group); | |
d761b08b MH |
549 | /* If force_add is true, suffix search is allowed */ |
550 | allow_suffix = force_add; | |
b498ce1f MH |
551 | for (i = 0; i < pp->found; i++) { |
552 | /* Get an unused new event name */ | |
d761b08b MH |
553 | get_new_event_name(event, 64, pp->event, namelist, |
554 | allow_suffix); | |
b498ce1f MH |
555 | snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s\n", |
556 | pp->retprobe ? 'r' : 'p', | |
af663d75 | 557 | pp->group, event, |
b498ce1f | 558 | pp->probes[i]); |
50656eec | 559 | write_trace_kprobe_event(fd, buf); |
a9b495b0 MH |
560 | printf("Added new event:\n"); |
561 | /* Get the first parameter (probe-point) */ | |
562 | sscanf(pp->probes[i], "%s", buf); | |
af663d75 | 563 | show_perf_probe_event(event, buf, pp); |
b498ce1f MH |
564 | /* Add added event name to namelist */ |
565 | strlist__add(namelist, event); | |
d761b08b MH |
566 | /* |
567 | * Probes after the first probe which comes from same | |
568 | * user input are always allowed to add suffix, because | |
569 | * there might be several addresses corresponding to | |
570 | * one code line. | |
571 | */ | |
572 | allow_suffix = true; | |
b498ce1f | 573 | } |
50656eec | 574 | } |
a9b495b0 MH |
575 | /* Show how to use the event. */ |
576 | printf("\nYou can now use it on all perf tools, such as:\n\n"); | |
577 | printf("\tperf record -e %s:%s -a sleep 1\n\n", PERFPROBE_GROUP, event); | |
578 | ||
e1d2017b | 579 | strlist__delete(namelist); |
50656eec MH |
580 | close(fd); |
581 | } | |
fa28244d | 582 | |
bbbb521b MH |
583 | static void __del_trace_kprobe_event(int fd, struct str_node *ent) |
584 | { | |
585 | char *p; | |
586 | char buf[128]; | |
587 | ||
588 | /* Convert from perf-probe event to trace-kprobe event */ | |
589 | if (e_snprintf(buf, 128, "-:%s", ent->s) < 0) | |
590 | die("Failed to copy event."); | |
591 | p = strchr(buf + 2, ':'); | |
592 | if (!p) | |
593 | die("Internal error: %s should have ':' but not.", ent->s); | |
594 | *p = '/'; | |
595 | ||
596 | write_trace_kprobe_event(fd, buf); | |
597 | printf("Remove event: %s\n", ent->s); | |
598 | } | |
599 | ||
fa28244d MH |
600 | static void del_trace_kprobe_event(int fd, const char *group, |
601 | const char *event, struct strlist *namelist) | |
602 | { | |
603 | char buf[128]; | |
bbbb521b MH |
604 | struct str_node *ent, *n; |
605 | int found = 0; | |
fa28244d MH |
606 | |
607 | if (e_snprintf(buf, 128, "%s:%s", group, event) < 0) | |
608 | die("Failed to copy event."); | |
fa28244d | 609 | |
bbbb521b MH |
610 | if (strpbrk(buf, "*?")) { /* Glob-exp */ |
611 | strlist__for_each_safe(ent, n, namelist) | |
612 | if (strglobmatch(ent->s, buf)) { | |
613 | found++; | |
614 | __del_trace_kprobe_event(fd, ent); | |
615 | strlist__remove(namelist, ent); | |
616 | } | |
617 | } else { | |
618 | ent = strlist__find(namelist, buf); | |
619 | if (ent) { | |
620 | found++; | |
621 | __del_trace_kprobe_event(fd, ent); | |
622 | strlist__remove(namelist, ent); | |
623 | } | |
624 | } | |
625 | if (found == 0) | |
626 | pr_info("Info: event \"%s\" does not exist, could not remove it.\n", buf); | |
fa28244d MH |
627 | } |
628 | ||
629 | void del_trace_kprobe_events(struct strlist *dellist) | |
630 | { | |
631 | int fd; | |
fa28244d MH |
632 | const char *group, *event; |
633 | char *p, *str; | |
634 | struct str_node *ent; | |
635 | struct strlist *namelist; | |
636 | ||
637 | fd = open_kprobe_events(O_RDWR, O_APPEND); | |
638 | /* Get current event names */ | |
639 | namelist = get_perf_event_names(fd, true); | |
640 | ||
adf365f4 | 641 | strlist__for_each(ent, dellist) { |
fa28244d MH |
642 | str = strdup(ent->s); |
643 | if (!str) | |
644 | die("Failed to copy event."); | |
bbbb521b | 645 | pr_debug("Parsing: %s\n", str); |
fa28244d MH |
646 | p = strchr(str, ':'); |
647 | if (p) { | |
648 | group = str; | |
649 | *p = '\0'; | |
650 | event = p + 1; | |
651 | } else { | |
bbbb521b | 652 | group = "*"; |
fa28244d MH |
653 | event = str; |
654 | } | |
bbbb521b | 655 | pr_debug("Group: %s, Event: %s\n", group, event); |
fa28244d MH |
656 | del_trace_kprobe_event(fd, group, event, namelist); |
657 | free(str); | |
658 | } | |
659 | strlist__delete(namelist); | |
660 | close(fd); | |
661 | } | |
662 |