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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 | ||
b7702a21 MH |
65 | /* Check the name is good for event/group */ |
66 | static bool check_event_name(const char *name) | |
67 | { | |
68 | if (!isalpha(*name) && *name != '_') | |
69 | return false; | |
70 | while (*++name != '\0') { | |
71 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
72 | return false; | |
73 | } | |
74 | return true; | |
75 | } | |
76 | ||
50656eec MH |
77 | /* Parse probepoint definition. */ |
78 | static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp) | |
79 | { | |
80 | char *ptr, *tmp; | |
81 | char c, nc = 0; | |
82 | /* | |
83 | * <Syntax> | |
af663d75 MH |
84 | * perf probe [EVENT=]SRC:LN |
85 | * perf probe [EVENT=]FUNC[+OFFS|%return][@SRC] | |
86 | * | |
87 | * TODO:Group name support | |
50656eec MH |
88 | */ |
89 | ||
af663d75 MH |
90 | ptr = strchr(arg, '='); |
91 | if (ptr) { /* Event name */ | |
92 | *ptr = '\0'; | |
93 | tmp = ptr + 1; | |
94 | ptr = strchr(arg, ':'); | |
95 | if (ptr) /* Group name is not supported yet. */ | |
96 | semantic_error("Group name is not supported yet."); | |
b7702a21 MH |
97 | if (!check_event_name(arg)) |
98 | semantic_error("%s is bad for event name -it must " | |
99 | "follow C symbol-naming rule.", arg); | |
af663d75 MH |
100 | pp->event = strdup(arg); |
101 | arg = tmp; | |
102 | } | |
103 | ||
50656eec MH |
104 | ptr = strpbrk(arg, ":+@%"); |
105 | if (ptr) { | |
106 | nc = *ptr; | |
107 | *ptr++ = '\0'; | |
108 | } | |
109 | ||
110 | /* Check arg is function or file and copy it */ | |
111 | if (strchr(arg, '.')) /* File */ | |
112 | pp->file = strdup(arg); | |
113 | else /* Function */ | |
114 | pp->function = strdup(arg); | |
115 | DIE_IF(pp->file == NULL && pp->function == NULL); | |
116 | ||
117 | /* Parse other options */ | |
118 | while (ptr) { | |
119 | arg = ptr; | |
120 | c = nc; | |
121 | ptr = strpbrk(arg, ":+@%"); | |
122 | if (ptr) { | |
123 | nc = *ptr; | |
124 | *ptr++ = '\0'; | |
125 | } | |
126 | switch (c) { | |
127 | case ':': /* Line number */ | |
128 | pp->line = strtoul(arg, &tmp, 0); | |
129 | if (*tmp != '\0') | |
130 | semantic_error("There is non-digit charactor" | |
131 | " in line number."); | |
132 | break; | |
133 | case '+': /* Byte offset from a symbol */ | |
134 | pp->offset = strtoul(arg, &tmp, 0); | |
135 | if (*tmp != '\0') | |
136 | semantic_error("There is non-digit charactor" | |
137 | " in offset."); | |
138 | break; | |
139 | case '@': /* File name */ | |
140 | if (pp->file) | |
141 | semantic_error("SRC@SRC is not allowed."); | |
142 | pp->file = strdup(arg); | |
143 | DIE_IF(pp->file == NULL); | |
144 | if (ptr) | |
145 | semantic_error("@SRC must be the last " | |
146 | "option."); | |
147 | break; | |
148 | case '%': /* Probe places */ | |
149 | if (strcmp(arg, "return") == 0) { | |
150 | pp->retprobe = 1; | |
151 | } else /* Others not supported yet */ | |
152 | semantic_error("%%%s is not supported.", arg); | |
153 | break; | |
154 | default: | |
155 | DIE_IF("Program has a bug."); | |
156 | break; | |
157 | } | |
158 | } | |
159 | ||
160 | /* Exclusion check */ | |
161 | if (pp->line && pp->offset) | |
162 | semantic_error("Offset can't be used with line number."); | |
163 | ||
164 | if (!pp->line && pp->file && !pp->function) | |
165 | semantic_error("File always requires line number."); | |
166 | ||
167 | if (pp->offset && !pp->function) | |
168 | semantic_error("Offset requires an entry function."); | |
169 | ||
170 | if (pp->retprobe && !pp->function) | |
171 | semantic_error("Return probe requires an entry function."); | |
172 | ||
173 | if ((pp->offset || pp->line) && pp->retprobe) | |
174 | semantic_error("Offset/Line can't be used with return probe."); | |
175 | ||
176 | pr_debug("symbol:%s file:%s line:%d offset:%d, return:%d\n", | |
177 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe); | |
178 | } | |
179 | ||
180 | /* Parse perf-probe event definition */ | |
fac13fd5 MH |
181 | void parse_perf_probe_event(const char *str, struct probe_point *pp, |
182 | bool *need_dwarf) | |
50656eec | 183 | { |
e1c01d61 | 184 | char **argv; |
fac13fd5 MH |
185 | int argc, i; |
186 | ||
187 | *need_dwarf = false; | |
50656eec | 188 | |
e1c01d61 MH |
189 | argv = argv_split(str, &argc); |
190 | if (!argv) | |
191 | die("argv_split failed."); | |
192 | if (argc > MAX_PROBE_ARGS + 1) | |
193 | semantic_error("Too many arguments"); | |
50656eec MH |
194 | |
195 | /* Parse probe point */ | |
196 | parse_perf_probe_probepoint(argv[0], pp); | |
50656eec | 197 | if (pp->file || pp->line) |
fac13fd5 | 198 | *need_dwarf = true; |
50656eec | 199 | |
e1c01d61 | 200 | /* Copy arguments and ensure return probe has no C argument */ |
50656eec | 201 | pp->nr_args = argc - 1; |
e1c01d61 MH |
202 | pp->args = zalloc(sizeof(char *) * pp->nr_args); |
203 | for (i = 0; i < pp->nr_args; i++) { | |
204 | pp->args[i] = strdup(argv[i + 1]); | |
205 | if (!pp->args[i]) | |
206 | die("Failed to copy argument."); | |
50656eec MH |
207 | if (is_c_varname(pp->args[i])) { |
208 | if (pp->retprobe) | |
209 | semantic_error("You can't specify local" | |
210 | " variable for kretprobe"); | |
fac13fd5 | 211 | *need_dwarf = true; |
50656eec | 212 | } |
e1c01d61 | 213 | } |
50656eec | 214 | |
e1c01d61 | 215 | argv_free(argv); |
50656eec MH |
216 | } |
217 | ||
4de189fe | 218 | /* Parse kprobe_events event into struct probe_point */ |
af663d75 | 219 | void parse_trace_kprobe_event(const char *str, struct probe_point *pp) |
4de189fe MH |
220 | { |
221 | char pr; | |
222 | char *p; | |
223 | int ret, i, argc; | |
224 | char **argv; | |
225 | ||
226 | pr_debug("Parsing kprobe_events: %s\n", str); | |
227 | argv = argv_split(str, &argc); | |
228 | if (!argv) | |
229 | die("argv_split failed."); | |
230 | if (argc < 2) | |
231 | semantic_error("Too less arguments."); | |
232 | ||
233 | /* Scan event and group name. */ | |
93aaa45a | 234 | ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]", |
af663d75 MH |
235 | &pr, (float *)(void *)&pp->group, |
236 | (float *)(void *)&pp->event); | |
4de189fe MH |
237 | if (ret != 3) |
238 | semantic_error("Failed to parse event name: %s", argv[0]); | |
af663d75 | 239 | pr_debug("Group:%s Event:%s probe:%c\n", pp->group, pp->event, pr); |
4de189fe MH |
240 | |
241 | pp->retprobe = (pr == 'r'); | |
242 | ||
243 | /* Scan function name and offset */ | |
af663d75 MH |
244 | ret = sscanf(argv[1], "%a[^+]+%d", (float *)(void *)&pp->function, |
245 | &pp->offset); | |
4de189fe MH |
246 | if (ret == 1) |
247 | pp->offset = 0; | |
248 | ||
249 | /* kprobe_events doesn't have this information */ | |
250 | pp->line = 0; | |
251 | pp->file = NULL; | |
252 | ||
253 | pp->nr_args = argc - 2; | |
254 | pp->args = zalloc(sizeof(char *) * pp->nr_args); | |
255 | for (i = 0; i < pp->nr_args; i++) { | |
256 | p = strchr(argv[i + 2], '='); | |
257 | if (p) /* We don't need which register is assigned. */ | |
258 | *p = '\0'; | |
259 | pp->args[i] = strdup(argv[i + 2]); | |
260 | if (!pp->args[i]) | |
261 | die("Failed to copy argument."); | |
262 | } | |
263 | ||
4de189fe MH |
264 | argv_free(argv); |
265 | } | |
266 | ||
7ef17aaf MH |
267 | /* Synthesize only probe point (not argument) */ |
268 | int synthesize_perf_probe_point(struct probe_point *pp) | |
4de189fe MH |
269 | { |
270 | char *buf; | |
271 | char offs[64] = "", line[64] = ""; | |
7ef17aaf | 272 | int ret; |
4de189fe MH |
273 | |
274 | pp->probes[0] = buf = zalloc(MAX_CMDLEN); | |
275 | if (!buf) | |
276 | die("Failed to allocate memory by zalloc."); | |
277 | if (pp->offset) { | |
278 | ret = e_snprintf(offs, 64, "+%d", pp->offset); | |
279 | if (ret <= 0) | |
280 | goto error; | |
281 | } | |
282 | if (pp->line) { | |
283 | ret = e_snprintf(line, 64, ":%d", pp->line); | |
284 | if (ret <= 0) | |
285 | goto error; | |
286 | } | |
287 | ||
288 | if (pp->function) | |
289 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s", pp->function, | |
290 | offs, pp->retprobe ? "%return" : "", line); | |
291 | else | |
84988450 | 292 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", pp->file, line); |
7ef17aaf MH |
293 | if (ret <= 0) { |
294 | error: | |
295 | free(pp->probes[0]); | |
296 | pp->probes[0] = NULL; | |
297 | } | |
298 | return ret; | |
299 | } | |
300 | ||
301 | int synthesize_perf_probe_event(struct probe_point *pp) | |
302 | { | |
303 | char *buf; | |
304 | int i, len, ret; | |
305 | ||
306 | len = synthesize_perf_probe_point(pp); | |
307 | if (len < 0) | |
308 | return 0; | |
4de189fe | 309 | |
7ef17aaf | 310 | buf = pp->probes[0]; |
4de189fe MH |
311 | for (i = 0; i < pp->nr_args; i++) { |
312 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", | |
313 | pp->args[i]); | |
314 | if (ret <= 0) | |
315 | goto error; | |
316 | len += ret; | |
317 | } | |
318 | pp->found = 1; | |
319 | ||
320 | return pp->found; | |
321 | error: | |
322 | free(pp->probes[0]); | |
7ef17aaf | 323 | pp->probes[0] = NULL; |
4de189fe MH |
324 | |
325 | return ret; | |
326 | } | |
327 | ||
50656eec MH |
328 | int synthesize_trace_kprobe_event(struct probe_point *pp) |
329 | { | |
330 | char *buf; | |
331 | int i, len, ret; | |
332 | ||
333 | pp->probes[0] = buf = zalloc(MAX_CMDLEN); | |
334 | if (!buf) | |
335 | die("Failed to allocate memory by zalloc."); | |
4de189fe MH |
336 | ret = e_snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset); |
337 | if (ret <= 0) | |
50656eec MH |
338 | goto error; |
339 | len = ret; | |
340 | ||
341 | for (i = 0; i < pp->nr_args; i++) { | |
4de189fe MH |
342 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
343 | pp->args[i]); | |
344 | if (ret <= 0) | |
50656eec MH |
345 | goto error; |
346 | len += ret; | |
347 | } | |
348 | pp->found = 1; | |
349 | ||
350 | return pp->found; | |
351 | error: | |
352 | free(pp->probes[0]); | |
7ef17aaf | 353 | pp->probes[0] = NULL; |
50656eec MH |
354 | |
355 | return ret; | |
356 | } | |
357 | ||
4de189fe MH |
358 | static int open_kprobe_events(int flags, int mode) |
359 | { | |
360 | char buf[PATH_MAX]; | |
361 | int ret; | |
362 | ||
363 | ret = e_snprintf(buf, PATH_MAX, "%s/../kprobe_events", debugfs_path); | |
364 | if (ret < 0) | |
365 | die("Failed to make kprobe_events path."); | |
366 | ||
367 | ret = open(buf, flags, mode); | |
368 | if (ret < 0) { | |
369 | if (errno == ENOENT) | |
370 | die("kprobe_events file does not exist -" | |
63bbd5e2 | 371 | " please rebuild with CONFIG_KPROBE_EVENT."); |
4de189fe MH |
372 | else |
373 | die("Could not open kprobe_events file: %s", | |
374 | strerror(errno)); | |
375 | } | |
376 | return ret; | |
377 | } | |
378 | ||
379 | /* Get raw string list of current kprobe_events */ | |
380 | static struct strlist *get_trace_kprobe_event_rawlist(int fd) | |
381 | { | |
382 | int ret, idx; | |
383 | FILE *fp; | |
384 | char buf[MAX_CMDLEN]; | |
385 | char *p; | |
386 | struct strlist *sl; | |
387 | ||
388 | sl = strlist__new(true, NULL); | |
389 | ||
390 | fp = fdopen(dup(fd), "r"); | |
391 | while (!feof(fp)) { | |
392 | p = fgets(buf, MAX_CMDLEN, fp); | |
393 | if (!p) | |
394 | break; | |
395 | ||
396 | idx = strlen(p) - 1; | |
397 | if (p[idx] == '\n') | |
398 | p[idx] = '\0'; | |
399 | ret = strlist__add(sl, buf); | |
400 | if (ret < 0) | |
401 | die("strlist__add failed: %s", strerror(-ret)); | |
402 | } | |
403 | fclose(fp); | |
404 | ||
405 | return sl; | |
406 | } | |
407 | ||
408 | /* Free and zero clear probe_point */ | |
409 | static void clear_probe_point(struct probe_point *pp) | |
410 | { | |
411 | int i; | |
412 | ||
af663d75 MH |
413 | if (pp->event) |
414 | free(pp->event); | |
415 | if (pp->group) | |
416 | free(pp->group); | |
4de189fe MH |
417 | if (pp->function) |
418 | free(pp->function); | |
419 | if (pp->file) | |
420 | free(pp->file); | |
421 | for (i = 0; i < pp->nr_args; i++) | |
422 | free(pp->args[i]); | |
423 | if (pp->args) | |
424 | free(pp->args); | |
425 | for (i = 0; i < pp->found; i++) | |
426 | free(pp->probes[i]); | |
5660ce34 | 427 | memset(pp, 0, sizeof(*pp)); |
4de189fe MH |
428 | } |
429 | ||
278498d4 | 430 | /* Show an event */ |
af663d75 MH |
431 | static void show_perf_probe_event(const char *event, const char *place, |
432 | struct probe_point *pp) | |
278498d4 | 433 | { |
7e990a51 | 434 | int i, ret; |
278498d4 MH |
435 | char buf[128]; |
436 | ||
af663d75 | 437 | ret = e_snprintf(buf, 128, "%s:%s", pp->group, event); |
7e990a51 MH |
438 | if (ret < 0) |
439 | die("Failed to copy event: %s", strerror(-ret)); | |
278498d4 MH |
440 | printf(" %-40s (on %s", buf, place); |
441 | ||
442 | if (pp->nr_args > 0) { | |
443 | printf(" with"); | |
444 | for (i = 0; i < pp->nr_args; i++) | |
445 | printf(" %s", pp->args[i]); | |
446 | } | |
447 | printf(")\n"); | |
448 | } | |
449 | ||
4de189fe MH |
450 | /* List up current perf-probe events */ |
451 | void show_perf_probe_events(void) | |
452 | { | |
7ef17aaf | 453 | int fd; |
4de189fe MH |
454 | struct probe_point pp; |
455 | struct strlist *rawlist; | |
456 | struct str_node *ent; | |
457 | ||
458 | fd = open_kprobe_events(O_RDONLY, 0); | |
459 | rawlist = get_trace_kprobe_event_rawlist(fd); | |
460 | close(fd); | |
461 | ||
adf365f4 | 462 | strlist__for_each(ent, rawlist) { |
af663d75 | 463 | parse_trace_kprobe_event(ent->s, &pp); |
278498d4 | 464 | /* Synthesize only event probe point */ |
7ef17aaf | 465 | synthesize_perf_probe_point(&pp); |
278498d4 | 466 | /* Show an event */ |
af663d75 | 467 | show_perf_probe_event(pp.event, pp.probes[0], &pp); |
4de189fe MH |
468 | clear_probe_point(&pp); |
469 | } | |
470 | ||
471 | strlist__delete(rawlist); | |
472 | } | |
473 | ||
b498ce1f | 474 | /* Get current perf-probe event names */ |
fa28244d | 475 | static struct strlist *get_perf_event_names(int fd, bool include_group) |
b498ce1f | 476 | { |
fa28244d | 477 | char buf[128]; |
b498ce1f MH |
478 | struct strlist *sl, *rawlist; |
479 | struct str_node *ent; | |
af663d75 | 480 | struct probe_point pp; |
b498ce1f | 481 | |
af663d75 | 482 | memset(&pp, 0, sizeof(pp)); |
b498ce1f MH |
483 | rawlist = get_trace_kprobe_event_rawlist(fd); |
484 | ||
e1d2017b | 485 | sl = strlist__new(true, NULL); |
adf365f4 | 486 | strlist__for_each(ent, rawlist) { |
af663d75 | 487 | parse_trace_kprobe_event(ent->s, &pp); |
fa28244d | 488 | if (include_group) { |
af663d75 MH |
489 | if (e_snprintf(buf, 128, "%s:%s", pp.group, |
490 | pp.event) < 0) | |
fa28244d MH |
491 | die("Failed to copy group:event name."); |
492 | strlist__add(sl, buf); | |
493 | } else | |
af663d75 MH |
494 | strlist__add(sl, pp.event); |
495 | clear_probe_point(&pp); | |
b498ce1f MH |
496 | } |
497 | ||
498 | strlist__delete(rawlist); | |
499 | ||
500 | return sl; | |
501 | } | |
502 | ||
a9b495b0 | 503 | static void write_trace_kprobe_event(int fd, const char *buf) |
50656eec MH |
504 | { |
505 | int ret; | |
506 | ||
fa28244d | 507 | pr_debug("Writing event: %s\n", buf); |
50656eec MH |
508 | ret = write(fd, buf, strlen(buf)); |
509 | if (ret <= 0) | |
fa28244d | 510 | die("Failed to write event: %s", strerror(errno)); |
50656eec MH |
511 | } |
512 | ||
b498ce1f | 513 | static void get_new_event_name(char *buf, size_t len, const char *base, |
d761b08b | 514 | struct strlist *namelist, bool allow_suffix) |
b498ce1f MH |
515 | { |
516 | int i, ret; | |
17f88fcd MH |
517 | |
518 | /* Try no suffix */ | |
519 | ret = e_snprintf(buf, len, "%s", base); | |
520 | if (ret < 0) | |
521 | die("snprintf() failed: %s", strerror(-ret)); | |
522 | if (!strlist__has_entry(namelist, buf)) | |
523 | return; | |
524 | ||
d761b08b MH |
525 | if (!allow_suffix) { |
526 | pr_warning("Error: event \"%s\" already exists. " | |
527 | "(Use -f to force duplicates.)\n", base); | |
528 | die("Can't add new event."); | |
529 | } | |
530 | ||
17f88fcd MH |
531 | /* Try to add suffix */ |
532 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
b498ce1f MH |
533 | ret = e_snprintf(buf, len, "%s_%d", base, i); |
534 | if (ret < 0) | |
535 | die("snprintf() failed: %s", strerror(-ret)); | |
536 | if (!strlist__has_entry(namelist, buf)) | |
537 | break; | |
538 | } | |
539 | if (i == MAX_EVENT_INDEX) | |
540 | die("Too many events are on the same function."); | |
541 | } | |
542 | ||
d761b08b MH |
543 | void add_trace_kprobe_events(struct probe_point *probes, int nr_probes, |
544 | bool force_add) | |
50656eec MH |
545 | { |
546 | int i, j, fd; | |
547 | struct probe_point *pp; | |
548 | char buf[MAX_CMDLEN]; | |
b498ce1f MH |
549 | char event[64]; |
550 | struct strlist *namelist; | |
d761b08b | 551 | bool allow_suffix; |
50656eec | 552 | |
b498ce1f MH |
553 | fd = open_kprobe_events(O_RDWR, O_APPEND); |
554 | /* Get current event names */ | |
fa28244d | 555 | namelist = get_perf_event_names(fd, false); |
50656eec MH |
556 | |
557 | for (j = 0; j < nr_probes; j++) { | |
558 | pp = probes + j; | |
af663d75 MH |
559 | if (!pp->event) |
560 | pp->event = strdup(pp->function); | |
561 | if (!pp->group) | |
562 | pp->group = strdup(PERFPROBE_GROUP); | |
563 | DIE_IF(!pp->event || !pp->group); | |
d761b08b MH |
564 | /* If force_add is true, suffix search is allowed */ |
565 | allow_suffix = force_add; | |
b498ce1f MH |
566 | for (i = 0; i < pp->found; i++) { |
567 | /* Get an unused new event name */ | |
d761b08b MH |
568 | get_new_event_name(event, 64, pp->event, namelist, |
569 | allow_suffix); | |
b498ce1f MH |
570 | snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s\n", |
571 | pp->retprobe ? 'r' : 'p', | |
af663d75 | 572 | pp->group, event, |
b498ce1f | 573 | pp->probes[i]); |
50656eec | 574 | write_trace_kprobe_event(fd, buf); |
a9b495b0 MH |
575 | printf("Added new event:\n"); |
576 | /* Get the first parameter (probe-point) */ | |
577 | sscanf(pp->probes[i], "%s", buf); | |
af663d75 | 578 | show_perf_probe_event(event, buf, pp); |
b498ce1f MH |
579 | /* Add added event name to namelist */ |
580 | strlist__add(namelist, event); | |
d761b08b MH |
581 | /* |
582 | * Probes after the first probe which comes from same | |
583 | * user input are always allowed to add suffix, because | |
584 | * there might be several addresses corresponding to | |
585 | * one code line. | |
586 | */ | |
587 | allow_suffix = true; | |
b498ce1f | 588 | } |
50656eec | 589 | } |
a9b495b0 MH |
590 | /* Show how to use the event. */ |
591 | printf("\nYou can now use it on all perf tools, such as:\n\n"); | |
592 | printf("\tperf record -e %s:%s -a sleep 1\n\n", PERFPROBE_GROUP, event); | |
593 | ||
e1d2017b | 594 | strlist__delete(namelist); |
50656eec MH |
595 | close(fd); |
596 | } | |
fa28244d | 597 | |
bbbb521b MH |
598 | static void __del_trace_kprobe_event(int fd, struct str_node *ent) |
599 | { | |
600 | char *p; | |
601 | char buf[128]; | |
602 | ||
603 | /* Convert from perf-probe event to trace-kprobe event */ | |
604 | if (e_snprintf(buf, 128, "-:%s", ent->s) < 0) | |
605 | die("Failed to copy event."); | |
606 | p = strchr(buf + 2, ':'); | |
607 | if (!p) | |
608 | die("Internal error: %s should have ':' but not.", ent->s); | |
609 | *p = '/'; | |
610 | ||
611 | write_trace_kprobe_event(fd, buf); | |
612 | printf("Remove event: %s\n", ent->s); | |
613 | } | |
614 | ||
fa28244d MH |
615 | static void del_trace_kprobe_event(int fd, const char *group, |
616 | const char *event, struct strlist *namelist) | |
617 | { | |
618 | char buf[128]; | |
bbbb521b MH |
619 | struct str_node *ent, *n; |
620 | int found = 0; | |
fa28244d MH |
621 | |
622 | if (e_snprintf(buf, 128, "%s:%s", group, event) < 0) | |
623 | die("Failed to copy event."); | |
fa28244d | 624 | |
bbbb521b MH |
625 | if (strpbrk(buf, "*?")) { /* Glob-exp */ |
626 | strlist__for_each_safe(ent, n, namelist) | |
627 | if (strglobmatch(ent->s, buf)) { | |
628 | found++; | |
629 | __del_trace_kprobe_event(fd, ent); | |
630 | strlist__remove(namelist, ent); | |
631 | } | |
632 | } else { | |
633 | ent = strlist__find(namelist, buf); | |
634 | if (ent) { | |
635 | found++; | |
636 | __del_trace_kprobe_event(fd, ent); | |
637 | strlist__remove(namelist, ent); | |
638 | } | |
639 | } | |
640 | if (found == 0) | |
641 | pr_info("Info: event \"%s\" does not exist, could not remove it.\n", buf); | |
fa28244d MH |
642 | } |
643 | ||
644 | void del_trace_kprobe_events(struct strlist *dellist) | |
645 | { | |
646 | int fd; | |
fa28244d MH |
647 | const char *group, *event; |
648 | char *p, *str; | |
649 | struct str_node *ent; | |
650 | struct strlist *namelist; | |
651 | ||
652 | fd = open_kprobe_events(O_RDWR, O_APPEND); | |
653 | /* Get current event names */ | |
654 | namelist = get_perf_event_names(fd, true); | |
655 | ||
adf365f4 | 656 | strlist__for_each(ent, dellist) { |
fa28244d MH |
657 | str = strdup(ent->s); |
658 | if (!str) | |
659 | die("Failed to copy event."); | |
bbbb521b | 660 | pr_debug("Parsing: %s\n", str); |
fa28244d MH |
661 | p = strchr(str, ':'); |
662 | if (p) { | |
663 | group = str; | |
664 | *p = '\0'; | |
665 | event = p + 1; | |
666 | } else { | |
bbbb521b | 667 | group = "*"; |
fa28244d MH |
668 | event = str; |
669 | } | |
bbbb521b | 670 | pr_debug("Group: %s, Event: %s\n", group, event); |
fa28244d MH |
671 | del_trace_kprobe_event(fd, group, event, namelist); |
672 | free(str); | |
673 | } | |
674 | strlist__delete(namelist); | |
675 | close(fd); | |
676 | } | |
677 |