Commit | Line | Data |
---|---|---|
92f6c72e MH |
1 | /* |
2 | * probe-file.c : operate ftrace k/uprobe events files | |
3 | * | |
4 | * Written by Masami Hiramatsu <masami.hiramatsu.pt@hitachi.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 | */ | |
dd975497 | 17 | #include <sys/uio.h> |
92f6c72e MH |
18 | #include "util.h" |
19 | #include "event.h" | |
20 | #include "strlist.h" | |
21 | #include "debug.h" | |
22 | #include "cache.h" | |
23 | #include "color.h" | |
24 | #include "symbol.h" | |
25 | #include "thread.h" | |
fbf99625 | 26 | #include <api/fs/tracing_path.h> |
92f6c72e MH |
27 | #include "probe-event.h" |
28 | #include "probe-file.h" | |
29 | #include "session.h" | |
30 | ||
31 | #define MAX_CMDLEN 256 | |
32 | ||
33 | static void print_open_warning(int err, bool uprobe) | |
34 | { | |
35 | char sbuf[STRERR_BUFSIZE]; | |
36 | ||
37 | if (err == -ENOENT) { | |
38 | const char *config; | |
39 | ||
40 | if (uprobe) | |
41 | config = "CONFIG_UPROBE_EVENTS"; | |
42 | else | |
43 | config = "CONFIG_KPROBE_EVENTS"; | |
44 | ||
45 | pr_warning("%cprobe_events file does not exist" | |
46 | " - please rebuild kernel with %s.\n", | |
47 | uprobe ? 'u' : 'k', config); | |
48 | } else if (err == -ENOTSUP) | |
49 | pr_warning("Tracefs or debugfs is not mounted.\n"); | |
50 | else | |
51 | pr_warning("Failed to open %cprobe_events: %s\n", | |
52 | uprobe ? 'u' : 'k', | |
c8b5f2c9 | 53 | str_error_r(-err, sbuf, sizeof(sbuf))); |
92f6c72e MH |
54 | } |
55 | ||
56 | static void print_both_open_warning(int kerr, int uerr) | |
57 | { | |
58 | /* Both kprobes and uprobes are disabled, warn it. */ | |
59 | if (kerr == -ENOTSUP && uerr == -ENOTSUP) | |
60 | pr_warning("Tracefs or debugfs is not mounted.\n"); | |
61 | else if (kerr == -ENOENT && uerr == -ENOENT) | |
62 | pr_warning("Please rebuild kernel with CONFIG_KPROBE_EVENTS " | |
63 | "or/and CONFIG_UPROBE_EVENTS.\n"); | |
64 | else { | |
65 | char sbuf[STRERR_BUFSIZE]; | |
66 | pr_warning("Failed to open kprobe events: %s.\n", | |
c8b5f2c9 | 67 | str_error_r(-kerr, sbuf, sizeof(sbuf))); |
92f6c72e | 68 | pr_warning("Failed to open uprobe events: %s.\n", |
c8b5f2c9 | 69 | str_error_r(-uerr, sbuf, sizeof(sbuf))); |
92f6c72e MH |
70 | } |
71 | } | |
72 | ||
73 | static int open_probe_events(const char *trace_file, bool readwrite) | |
74 | { | |
75 | char buf[PATH_MAX]; | |
92f6c72e MH |
76 | const char *tracing_dir = ""; |
77 | int ret; | |
78 | ||
92f6c72e | 79 | ret = e_snprintf(buf, PATH_MAX, "%s/%s%s", |
fbf99625 | 80 | tracing_path, tracing_dir, trace_file); |
92f6c72e MH |
81 | if (ret >= 0) { |
82 | pr_debug("Opening %s write=%d\n", buf, readwrite); | |
83 | if (readwrite && !probe_event_dry_run) | |
84 | ret = open(buf, O_RDWR | O_APPEND, 0); | |
85 | else | |
86 | ret = open(buf, O_RDONLY, 0); | |
87 | ||
88 | if (ret < 0) | |
89 | ret = -errno; | |
90 | } | |
91 | return ret; | |
92 | } | |
93 | ||
94 | static int open_kprobe_events(bool readwrite) | |
95 | { | |
96 | return open_probe_events("kprobe_events", readwrite); | |
97 | } | |
98 | ||
99 | static int open_uprobe_events(bool readwrite) | |
100 | { | |
101 | return open_probe_events("uprobe_events", readwrite); | |
102 | } | |
103 | ||
104 | int probe_file__open(int flag) | |
105 | { | |
106 | int fd; | |
107 | ||
108 | if (flag & PF_FL_UPROBE) | |
109 | fd = open_uprobe_events(flag & PF_FL_RW); | |
110 | else | |
111 | fd = open_kprobe_events(flag & PF_FL_RW); | |
112 | if (fd < 0) | |
113 | print_open_warning(fd, flag & PF_FL_UPROBE); | |
114 | ||
115 | return fd; | |
116 | } | |
117 | ||
118 | int probe_file__open_both(int *kfd, int *ufd, int flag) | |
119 | { | |
120 | if (!kfd || !ufd) | |
121 | return -EINVAL; | |
122 | ||
123 | *kfd = open_kprobe_events(flag & PF_FL_RW); | |
124 | *ufd = open_uprobe_events(flag & PF_FL_RW); | |
125 | if (*kfd < 0 && *ufd < 0) { | |
126 | print_both_open_warning(*kfd, *ufd); | |
127 | return *kfd; | |
128 | } | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | /* Get raw string list of current kprobe_events or uprobe_events */ | |
134 | struct strlist *probe_file__get_rawlist(int fd) | |
135 | { | |
0325862d | 136 | int ret, idx, fddup; |
92f6c72e MH |
137 | FILE *fp; |
138 | char buf[MAX_CMDLEN]; | |
139 | char *p; | |
140 | struct strlist *sl; | |
141 | ||
421fd084 WN |
142 | if (fd < 0) |
143 | return NULL; | |
144 | ||
92f6c72e | 145 | sl = strlist__new(NULL, NULL); |
60ebc159 ACM |
146 | if (sl == NULL) |
147 | return NULL; | |
92f6c72e | 148 | |
0325862d CIK |
149 | fddup = dup(fd); |
150 | if (fddup < 0) | |
151 | goto out_free_sl; | |
152 | ||
153 | fp = fdopen(fddup, "r"); | |
154 | if (!fp) | |
155 | goto out_close_fddup; | |
156 | ||
92f6c72e MH |
157 | while (!feof(fp)) { |
158 | p = fgets(buf, MAX_CMDLEN, fp); | |
159 | if (!p) | |
160 | break; | |
161 | ||
162 | idx = strlen(p) - 1; | |
163 | if (p[idx] == '\n') | |
164 | p[idx] = '\0'; | |
165 | ret = strlist__add(sl, buf); | |
166 | if (ret < 0) { | |
167 | pr_debug("strlist__add failed (%d)\n", ret); | |
60ebc159 | 168 | goto out_close_fp; |
92f6c72e MH |
169 | } |
170 | } | |
171 | fclose(fp); | |
172 | ||
173 | return sl; | |
0325862d | 174 | |
60ebc159 ACM |
175 | out_close_fp: |
176 | fclose(fp); | |
177 | goto out_free_sl; | |
0325862d CIK |
178 | out_close_fddup: |
179 | close(fddup); | |
180 | out_free_sl: | |
181 | strlist__delete(sl); | |
182 | return NULL; | |
92f6c72e MH |
183 | } |
184 | ||
185 | static struct strlist *__probe_file__get_namelist(int fd, bool include_group) | |
186 | { | |
187 | char buf[128]; | |
188 | struct strlist *sl, *rawlist; | |
189 | struct str_node *ent; | |
190 | struct probe_trace_event tev; | |
191 | int ret = 0; | |
192 | ||
193 | memset(&tev, 0, sizeof(tev)); | |
194 | rawlist = probe_file__get_rawlist(fd); | |
195 | if (!rawlist) | |
196 | return NULL; | |
197 | sl = strlist__new(NULL, NULL); | |
602a1f4d | 198 | strlist__for_each_entry(ent, rawlist) { |
92f6c72e MH |
199 | ret = parse_probe_trace_command(ent->s, &tev); |
200 | if (ret < 0) | |
201 | break; | |
202 | if (include_group) { | |
203 | ret = e_snprintf(buf, 128, "%s:%s", tev.group, | |
204 | tev.event); | |
205 | if (ret >= 0) | |
206 | ret = strlist__add(sl, buf); | |
207 | } else | |
208 | ret = strlist__add(sl, tev.event); | |
209 | clear_probe_trace_event(&tev); | |
210 | if (ret < 0) | |
211 | break; | |
212 | } | |
213 | strlist__delete(rawlist); | |
214 | ||
215 | if (ret < 0) { | |
216 | strlist__delete(sl); | |
217 | return NULL; | |
218 | } | |
219 | return sl; | |
220 | } | |
221 | ||
222 | /* Get current perf-probe event names */ | |
223 | struct strlist *probe_file__get_namelist(int fd) | |
224 | { | |
225 | return __probe_file__get_namelist(fd, false); | |
226 | } | |
227 | ||
228 | int probe_file__add_event(int fd, struct probe_trace_event *tev) | |
229 | { | |
230 | int ret = 0; | |
231 | char *buf = synthesize_probe_trace_command(tev); | |
232 | char sbuf[STRERR_BUFSIZE]; | |
233 | ||
234 | if (!buf) { | |
235 | pr_debug("Failed to synthesize probe trace event.\n"); | |
236 | return -EINVAL; | |
237 | } | |
238 | ||
239 | pr_debug("Writing event: %s\n", buf); | |
240 | if (!probe_event_dry_run) { | |
6ed0720a | 241 | if (write(fd, buf, strlen(buf)) < (int)strlen(buf)) { |
92f6c72e MH |
242 | ret = -errno; |
243 | pr_warning("Failed to write event: %s\n", | |
c8b5f2c9 | 244 | str_error_r(errno, sbuf, sizeof(sbuf))); |
92f6c72e MH |
245 | } |
246 | } | |
247 | free(buf); | |
248 | ||
249 | return ret; | |
250 | } | |
251 | ||
252 | static int __del_trace_probe_event(int fd, struct str_node *ent) | |
253 | { | |
254 | char *p; | |
255 | char buf[128]; | |
256 | int ret; | |
257 | ||
258 | /* Convert from perf-probe event to trace-probe event */ | |
259 | ret = e_snprintf(buf, 128, "-:%s", ent->s); | |
260 | if (ret < 0) | |
261 | goto error; | |
262 | ||
263 | p = strchr(buf + 2, ':'); | |
264 | if (!p) { | |
265 | pr_debug("Internal error: %s should have ':' but not.\n", | |
266 | ent->s); | |
267 | ret = -ENOTSUP; | |
268 | goto error; | |
269 | } | |
270 | *p = '/'; | |
271 | ||
272 | pr_debug("Writing event: %s\n", buf); | |
273 | ret = write(fd, buf, strlen(buf)); | |
274 | if (ret < 0) { | |
275 | ret = -errno; | |
276 | goto error; | |
277 | } | |
278 | ||
92f6c72e MH |
279 | return 0; |
280 | error: | |
281 | pr_warning("Failed to delete event: %s\n", | |
c8b5f2c9 | 282 | str_error_r(-ret, buf, sizeof(buf))); |
92f6c72e MH |
283 | return ret; |
284 | } | |
285 | ||
e607f142 NK |
286 | int probe_file__get_events(int fd, struct strfilter *filter, |
287 | struct strlist *plist) | |
92f6c72e MH |
288 | { |
289 | struct strlist *namelist; | |
290 | struct str_node *ent; | |
291 | const char *p; | |
292 | int ret = -ENOENT; | |
293 | ||
421fd084 WN |
294 | if (!plist) |
295 | return -EINVAL; | |
296 | ||
92f6c72e MH |
297 | namelist = __probe_file__get_namelist(fd, true); |
298 | if (!namelist) | |
299 | return -ENOENT; | |
300 | ||
602a1f4d | 301 | strlist__for_each_entry(ent, namelist) { |
92f6c72e MH |
302 | p = strchr(ent->s, ':'); |
303 | if ((p && strfilter__compare(filter, p + 1)) || | |
304 | strfilter__compare(filter, ent->s)) { | |
e7895e42 NK |
305 | strlist__add(plist, ent->s); |
306 | ret = 0; | |
92f6c72e MH |
307 | } |
308 | } | |
309 | strlist__delete(namelist); | |
310 | ||
311 | return ret; | |
312 | } | |
e7895e42 | 313 | |
e607f142 | 314 | int probe_file__del_strlist(int fd, struct strlist *namelist) |
e7895e42 NK |
315 | { |
316 | int ret = 0; | |
317 | struct str_node *ent; | |
318 | ||
602a1f4d | 319 | strlist__for_each_entry(ent, namelist) { |
e7895e42 NK |
320 | ret = __del_trace_probe_event(fd, ent); |
321 | if (ret < 0) | |
322 | break; | |
323 | } | |
324 | return ret; | |
325 | } | |
326 | ||
327 | int probe_file__del_events(int fd, struct strfilter *filter) | |
328 | { | |
329 | struct strlist *namelist; | |
330 | int ret; | |
331 | ||
332 | namelist = strlist__new(NULL, NULL); | |
333 | if (!namelist) | |
334 | return -ENOMEM; | |
335 | ||
336 | ret = probe_file__get_events(fd, filter, namelist); | |
337 | if (ret < 0) | |
338 | return ret; | |
339 | ||
340 | ret = probe_file__del_strlist(fd, namelist); | |
341 | strlist__delete(namelist); | |
342 | ||
343 | return ret; | |
344 | } | |
dd975497 MH |
345 | |
346 | /* Caller must ensure to remove this entry from list */ | |
347 | static void probe_cache_entry__delete(struct probe_cache_entry *entry) | |
348 | { | |
349 | if (entry) { | |
350 | BUG_ON(!list_empty(&entry->node)); | |
351 | ||
352 | strlist__delete(entry->tevlist); | |
353 | clear_perf_probe_event(&entry->pev); | |
354 | zfree(&entry->spev); | |
355 | free(entry); | |
356 | } | |
357 | } | |
358 | ||
359 | static struct probe_cache_entry * | |
360 | probe_cache_entry__new(struct perf_probe_event *pev) | |
361 | { | |
362 | struct probe_cache_entry *entry = zalloc(sizeof(*entry)); | |
363 | ||
364 | if (entry) { | |
365 | INIT_LIST_HEAD(&entry->node); | |
366 | entry->tevlist = strlist__new(NULL, NULL); | |
367 | if (!entry->tevlist) | |
368 | zfree(&entry); | |
369 | else if (pev) { | |
370 | entry->spev = synthesize_perf_probe_command(pev); | |
371 | if (!entry->spev || | |
372 | perf_probe_event__copy(&entry->pev, pev) < 0) { | |
373 | probe_cache_entry__delete(entry); | |
374 | return NULL; | |
375 | } | |
376 | } | |
377 | } | |
378 | ||
379 | return entry; | |
380 | } | |
381 | ||
42bba263 MH |
382 | int probe_cache_entry__get_event(struct probe_cache_entry *entry, |
383 | struct probe_trace_event **tevs) | |
384 | { | |
385 | struct probe_trace_event *tev; | |
386 | struct str_node *node; | |
387 | int ret, i; | |
388 | ||
389 | ret = strlist__nr_entries(entry->tevlist); | |
390 | if (ret > probe_conf.max_probes) | |
391 | return -E2BIG; | |
392 | ||
393 | *tevs = zalloc(ret * sizeof(*tev)); | |
394 | if (!*tevs) | |
395 | return -ENOMEM; | |
396 | ||
397 | i = 0; | |
398 | strlist__for_each_entry(node, entry->tevlist) { | |
399 | tev = &(*tevs)[i++]; | |
400 | ret = parse_probe_trace_command(node->s, tev); | |
401 | if (ret < 0) | |
402 | break; | |
403 | } | |
404 | return i; | |
405 | } | |
406 | ||
407 | /* For the kernel probe caches, pass target = NULL or DSO__NAME_KALLSYMS */ | |
dd975497 MH |
408 | static int probe_cache__open(struct probe_cache *pcache, const char *target) |
409 | { | |
410 | char cpath[PATH_MAX]; | |
411 | char sbuildid[SBUILD_ID_SIZE]; | |
1f3736c9 | 412 | char *dir_name = NULL; |
42bba263 | 413 | bool is_kallsyms = false; |
dd975497 MH |
414 | int ret, fd; |
415 | ||
1f3736c9 MH |
416 | if (target && build_id_cache__cached(target)) { |
417 | /* This is a cached buildid */ | |
418 | strncpy(sbuildid, target, SBUILD_ID_SIZE); | |
419 | dir_name = build_id_cache__linkname(sbuildid, NULL, 0); | |
420 | goto found; | |
421 | } | |
422 | ||
42bba263 | 423 | if (!target || !strcmp(target, DSO__NAME_KALLSYMS)) { |
dd975497 | 424 | target = DSO__NAME_KALLSYMS; |
42bba263 | 425 | is_kallsyms = true; |
dd975497 | 426 | ret = sysfs__sprintf_build_id("/", sbuildid); |
42bba263 MH |
427 | } else |
428 | ret = filename__sprintf_build_id(target, sbuildid); | |
429 | ||
dd975497 MH |
430 | if (ret < 0) { |
431 | pr_debug("Failed to get build-id from %s.\n", target); | |
432 | return ret; | |
433 | } | |
434 | ||
435 | /* If we have no buildid cache, make it */ | |
436 | if (!build_id_cache__cached(sbuildid)) { | |
437 | ret = build_id_cache__add_s(sbuildid, target, | |
438 | is_kallsyms, NULL); | |
439 | if (ret < 0) { | |
440 | pr_debug("Failed to add build-id cache: %s\n", target); | |
441 | return ret; | |
442 | } | |
443 | } | |
444 | ||
445 | dir_name = build_id_cache__cachedir(sbuildid, target, is_kallsyms, | |
446 | false); | |
1f3736c9 MH |
447 | found: |
448 | if (!dir_name) { | |
449 | pr_debug("Failed to get cache from %s\n", target); | |
dd975497 | 450 | return -ENOMEM; |
1f3736c9 | 451 | } |
dd975497 MH |
452 | |
453 | snprintf(cpath, PATH_MAX, "%s/probes", dir_name); | |
454 | fd = open(cpath, O_CREAT | O_RDWR, 0644); | |
455 | if (fd < 0) | |
456 | pr_debug("Failed to open cache(%d): %s\n", fd, cpath); | |
457 | free(dir_name); | |
458 | pcache->fd = fd; | |
459 | ||
460 | return fd; | |
461 | } | |
462 | ||
463 | static int probe_cache__load(struct probe_cache *pcache) | |
464 | { | |
465 | struct probe_cache_entry *entry = NULL; | |
466 | char buf[MAX_CMDLEN], *p; | |
0325862d | 467 | int ret = 0, fddup; |
dd975497 MH |
468 | FILE *fp; |
469 | ||
0325862d CIK |
470 | fddup = dup(pcache->fd); |
471 | if (fddup < 0) | |
472 | return -errno; | |
473 | fp = fdopen(fddup, "r"); | |
60ebc159 ACM |
474 | if (!fp) { |
475 | close(fddup); | |
dd975497 | 476 | return -EINVAL; |
60ebc159 | 477 | } |
dd975497 MH |
478 | |
479 | while (!feof(fp)) { | |
480 | if (!fgets(buf, MAX_CMDLEN, fp)) | |
481 | break; | |
482 | p = strchr(buf, '\n'); | |
483 | if (p) | |
484 | *p = '\0'; | |
6430a94e MH |
485 | /* #perf_probe_event or %sdt_event */ |
486 | if (buf[0] == '#' || buf[0] == '%') { | |
dd975497 MH |
487 | entry = probe_cache_entry__new(NULL); |
488 | if (!entry) { | |
489 | ret = -ENOMEM; | |
490 | goto out; | |
491 | } | |
6430a94e MH |
492 | if (buf[0] == '%') |
493 | entry->sdt = true; | |
dd975497 MH |
494 | entry->spev = strdup(buf + 1); |
495 | if (entry->spev) | |
496 | ret = parse_perf_probe_command(buf + 1, | |
497 | &entry->pev); | |
498 | else | |
499 | ret = -ENOMEM; | |
500 | if (ret < 0) { | |
501 | probe_cache_entry__delete(entry); | |
502 | goto out; | |
503 | } | |
504 | list_add_tail(&entry->node, &pcache->entries); | |
505 | } else { /* trace_probe_event */ | |
506 | if (!entry) { | |
507 | ret = -EINVAL; | |
508 | goto out; | |
509 | } | |
510 | strlist__add(entry->tevlist, buf); | |
511 | } | |
512 | } | |
513 | out: | |
514 | fclose(fp); | |
515 | return ret; | |
516 | } | |
517 | ||
518 | static struct probe_cache *probe_cache__alloc(void) | |
519 | { | |
520 | struct probe_cache *pcache = zalloc(sizeof(*pcache)); | |
521 | ||
522 | if (pcache) { | |
523 | INIT_LIST_HEAD(&pcache->entries); | |
524 | pcache->fd = -EINVAL; | |
525 | } | |
526 | return pcache; | |
527 | } | |
528 | ||
529 | void probe_cache__purge(struct probe_cache *pcache) | |
530 | { | |
531 | struct probe_cache_entry *entry, *n; | |
532 | ||
533 | list_for_each_entry_safe(entry, n, &pcache->entries, node) { | |
534 | list_del_init(&entry->node); | |
535 | probe_cache_entry__delete(entry); | |
536 | } | |
537 | } | |
538 | ||
539 | void probe_cache__delete(struct probe_cache *pcache) | |
540 | { | |
541 | if (!pcache) | |
542 | return; | |
543 | ||
544 | probe_cache__purge(pcache); | |
545 | if (pcache->fd > 0) | |
546 | close(pcache->fd); | |
547 | free(pcache); | |
548 | } | |
549 | ||
550 | struct probe_cache *probe_cache__new(const char *target) | |
551 | { | |
552 | struct probe_cache *pcache = probe_cache__alloc(); | |
553 | int ret; | |
554 | ||
555 | if (!pcache) | |
556 | return NULL; | |
557 | ||
558 | ret = probe_cache__open(pcache, target); | |
559 | if (ret < 0) { | |
560 | pr_debug("Cache open error: %d\n", ret); | |
561 | goto out_err; | |
562 | } | |
563 | ||
564 | ret = probe_cache__load(pcache); | |
565 | if (ret < 0) { | |
566 | pr_debug("Cache read error: %d\n", ret); | |
567 | goto out_err; | |
568 | } | |
569 | ||
570 | return pcache; | |
571 | ||
572 | out_err: | |
573 | probe_cache__delete(pcache); | |
574 | return NULL; | |
575 | } | |
576 | ||
577 | static bool streql(const char *a, const char *b) | |
578 | { | |
579 | if (a == b) | |
580 | return true; | |
581 | ||
582 | if (!a || !b) | |
583 | return false; | |
584 | ||
585 | return !strcmp(a, b); | |
586 | } | |
587 | ||
bc062230 | 588 | struct probe_cache_entry * |
dd975497 MH |
589 | probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev) |
590 | { | |
591 | struct probe_cache_entry *entry = NULL; | |
592 | char *cmd = synthesize_perf_probe_command(pev); | |
593 | ||
594 | if (!cmd) | |
595 | return NULL; | |
596 | ||
05bf2c8a | 597 | for_each_probe_cache_entry(entry, pcache) { |
36a009fe MH |
598 | if (pev->sdt) { |
599 | if (entry->pev.event && | |
600 | streql(entry->pev.event, pev->event) && | |
601 | (!pev->group || | |
602 | streql(entry->pev.group, pev->group))) | |
603 | goto found; | |
604 | ||
605 | continue; | |
606 | } | |
dd975497 MH |
607 | /* Hit if same event name or same command-string */ |
608 | if ((pev->event && | |
609 | (streql(entry->pev.group, pev->group) && | |
610 | streql(entry->pev.event, pev->event))) || | |
611 | (!strcmp(entry->spev, cmd))) | |
612 | goto found; | |
613 | } | |
614 | entry = NULL; | |
615 | ||
616 | found: | |
617 | free(cmd); | |
618 | return entry; | |
619 | } | |
620 | ||
bc062230 MH |
621 | struct probe_cache_entry * |
622 | probe_cache__find_by_name(struct probe_cache *pcache, | |
623 | const char *group, const char *event) | |
624 | { | |
625 | struct probe_cache_entry *entry = NULL; | |
626 | ||
05bf2c8a | 627 | for_each_probe_cache_entry(entry, pcache) { |
bc062230 MH |
628 | /* Hit if same event name or same command-string */ |
629 | if (streql(entry->pev.group, group) && | |
630 | streql(entry->pev.event, event)) | |
631 | goto found; | |
632 | } | |
633 | entry = NULL; | |
634 | ||
635 | found: | |
636 | return entry; | |
637 | } | |
638 | ||
dd975497 MH |
639 | int probe_cache__add_entry(struct probe_cache *pcache, |
640 | struct perf_probe_event *pev, | |
641 | struct probe_trace_event *tevs, int ntevs) | |
642 | { | |
643 | struct probe_cache_entry *entry = NULL; | |
644 | char *command; | |
645 | int i, ret = 0; | |
646 | ||
647 | if (!pcache || !pev || !tevs || ntevs <= 0) { | |
648 | ret = -EINVAL; | |
649 | goto out_err; | |
650 | } | |
651 | ||
652 | /* Remove old cache entry */ | |
653 | entry = probe_cache__find(pcache, pev); | |
654 | if (entry) { | |
655 | list_del_init(&entry->node); | |
656 | probe_cache_entry__delete(entry); | |
657 | } | |
658 | ||
659 | ret = -ENOMEM; | |
660 | entry = probe_cache_entry__new(pev); | |
661 | if (!entry) | |
662 | goto out_err; | |
663 | ||
664 | for (i = 0; i < ntevs; i++) { | |
665 | if (!tevs[i].point.symbol) | |
666 | continue; | |
667 | ||
668 | command = synthesize_probe_trace_command(&tevs[i]); | |
669 | if (!command) | |
670 | goto out_err; | |
671 | strlist__add(entry->tevlist, command); | |
672 | free(command); | |
673 | } | |
674 | list_add_tail(&entry->node, &pcache->entries); | |
675 | pr_debug("Added probe cache: %d\n", ntevs); | |
676 | return 0; | |
677 | ||
678 | out_err: | |
679 | pr_debug("Failed to add probe caches\n"); | |
680 | probe_cache_entry__delete(entry); | |
681 | return ret; | |
682 | } | |
683 | ||
1c1a3a47 | 684 | #ifdef HAVE_GELF_GETNOTE_SUPPORT |
6430a94e MH |
685 | static unsigned long long sdt_note__get_addr(struct sdt_note *note) |
686 | { | |
687 | return note->bit32 ? (unsigned long long)note->addr.a32[0] | |
688 | : (unsigned long long)note->addr.a64[0]; | |
689 | } | |
690 | ||
691 | int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname) | |
692 | { | |
693 | struct probe_cache_entry *entry = NULL; | |
694 | struct list_head sdtlist; | |
695 | struct sdt_note *note; | |
696 | char *buf; | |
697 | char sdtgrp[64]; | |
698 | int ret; | |
699 | ||
700 | INIT_LIST_HEAD(&sdtlist); | |
701 | ret = get_sdt_note_list(&sdtlist, pathname); | |
702 | if (ret < 0) { | |
703 | pr_debug("Failed to get sdt note: %d\n", ret); | |
704 | return ret; | |
705 | } | |
706 | list_for_each_entry(note, &sdtlist, note_list) { | |
707 | ret = snprintf(sdtgrp, 64, "sdt_%s", note->provider); | |
708 | if (ret < 0) | |
709 | break; | |
710 | /* Try to find same-name entry */ | |
711 | entry = probe_cache__find_by_name(pcache, sdtgrp, note->name); | |
712 | if (!entry) { | |
713 | entry = probe_cache_entry__new(NULL); | |
714 | if (!entry) { | |
715 | ret = -ENOMEM; | |
716 | break; | |
717 | } | |
718 | entry->sdt = true; | |
719 | ret = asprintf(&entry->spev, "%s:%s=%s", sdtgrp, | |
720 | note->name, note->name); | |
721 | if (ret < 0) | |
722 | break; | |
723 | entry->pev.event = strdup(note->name); | |
724 | entry->pev.group = strdup(sdtgrp); | |
725 | list_add_tail(&entry->node, &pcache->entries); | |
726 | } | |
727 | ret = asprintf(&buf, "p:%s/%s %s:0x%llx", | |
728 | sdtgrp, note->name, pathname, | |
729 | sdt_note__get_addr(note)); | |
730 | if (ret < 0) | |
731 | break; | |
732 | strlist__add(entry->tevlist, buf); | |
733 | free(buf); | |
734 | entry = NULL; | |
735 | } | |
736 | if (entry) { | |
737 | list_del_init(&entry->node); | |
738 | probe_cache_entry__delete(entry); | |
739 | } | |
740 | cleanup_sdt_note_list(&sdtlist); | |
741 | return ret; | |
742 | } | |
1c1a3a47 | 743 | #endif |
6430a94e | 744 | |
dd975497 MH |
745 | static int probe_cache_entry__write(struct probe_cache_entry *entry, int fd) |
746 | { | |
747 | struct str_node *snode; | |
748 | struct stat st; | |
749 | struct iovec iov[3]; | |
6430a94e | 750 | const char *prefix = entry->sdt ? "%" : "#"; |
dd975497 MH |
751 | int ret; |
752 | /* Save stat for rollback */ | |
753 | ret = fstat(fd, &st); | |
754 | if (ret < 0) | |
755 | return ret; | |
756 | ||
6430a94e MH |
757 | pr_debug("Writing cache: %s%s\n", prefix, entry->spev); |
758 | iov[0].iov_base = (void *)prefix; iov[0].iov_len = 1; | |
dd975497 MH |
759 | iov[1].iov_base = entry->spev; iov[1].iov_len = strlen(entry->spev); |
760 | iov[2].iov_base = (void *)"\n"; iov[2].iov_len = 1; | |
761 | ret = writev(fd, iov, 3); | |
762 | if (ret < (int)iov[1].iov_len + 2) | |
763 | goto rollback; | |
764 | ||
602a1f4d | 765 | strlist__for_each_entry(snode, entry->tevlist) { |
dd975497 MH |
766 | iov[0].iov_base = (void *)snode->s; |
767 | iov[0].iov_len = strlen(snode->s); | |
768 | iov[1].iov_base = (void *)"\n"; iov[1].iov_len = 1; | |
769 | ret = writev(fd, iov, 2); | |
770 | if (ret < (int)iov[0].iov_len + 1) | |
771 | goto rollback; | |
772 | } | |
773 | return 0; | |
774 | ||
775 | rollback: | |
776 | /* Rollback to avoid cache file corruption */ | |
777 | if (ret > 0) | |
778 | ret = -1; | |
779 | if (ftruncate(fd, st.st_size) < 0) | |
780 | ret = -2; | |
781 | ||
782 | return ret; | |
783 | } | |
784 | ||
785 | int probe_cache__commit(struct probe_cache *pcache) | |
786 | { | |
787 | struct probe_cache_entry *entry; | |
788 | int ret = 0; | |
789 | ||
790 | /* TBD: if we do not update existing entries, skip it */ | |
791 | ret = lseek(pcache->fd, 0, SEEK_SET); | |
792 | if (ret < 0) | |
793 | goto out; | |
794 | ||
795 | ret = ftruncate(pcache->fd, 0); | |
796 | if (ret < 0) | |
797 | goto out; | |
798 | ||
05bf2c8a | 799 | for_each_probe_cache_entry(entry, pcache) { |
dd975497 MH |
800 | ret = probe_cache_entry__write(entry, pcache->fd); |
801 | pr_debug("Cache committed: %d\n", ret); | |
802 | if (ret < 0) | |
803 | break; | |
804 | } | |
805 | out: | |
806 | return ret; | |
807 | } | |
1f3736c9 | 808 | |
4a0f65c1 MH |
809 | static bool probe_cache_entry__compare(struct probe_cache_entry *entry, |
810 | struct strfilter *filter) | |
811 | { | |
812 | char buf[128], *ptr = entry->spev; | |
813 | ||
814 | if (entry->pev.event) { | |
815 | snprintf(buf, 128, "%s:%s", entry->pev.group, entry->pev.event); | |
816 | ptr = buf; | |
817 | } | |
818 | return strfilter__compare(filter, ptr); | |
819 | } | |
820 | ||
821 | int probe_cache__filter_purge(struct probe_cache *pcache, | |
822 | struct strfilter *filter) | |
823 | { | |
824 | struct probe_cache_entry *entry, *tmp; | |
825 | ||
826 | list_for_each_entry_safe(entry, tmp, &pcache->entries, node) { | |
827 | if (probe_cache_entry__compare(entry, filter)) { | |
828 | pr_info("Removed cached event: %s\n", entry->spev); | |
829 | list_del_init(&entry->node); | |
830 | probe_cache_entry__delete(entry); | |
831 | } | |
832 | } | |
833 | return 0; | |
834 | } | |
835 | ||
1f3736c9 MH |
836 | static int probe_cache__show_entries(struct probe_cache *pcache, |
837 | struct strfilter *filter) | |
838 | { | |
839 | struct probe_cache_entry *entry; | |
1f3736c9 | 840 | |
05bf2c8a | 841 | for_each_probe_cache_entry(entry, pcache) { |
4a0f65c1 | 842 | if (probe_cache_entry__compare(entry, filter)) |
1f3736c9 MH |
843 | printf("%s\n", entry->spev); |
844 | } | |
845 | return 0; | |
846 | } | |
847 | ||
848 | /* Show all cached probes */ | |
849 | int probe_cache__show_all_caches(struct strfilter *filter) | |
850 | { | |
851 | struct probe_cache *pcache; | |
852 | struct strlist *bidlist; | |
853 | struct str_node *nd; | |
854 | char *buf = strfilter__string(filter); | |
855 | ||
856 | pr_debug("list cache with filter: %s\n", buf); | |
857 | free(buf); | |
858 | ||
c3492a3a | 859 | bidlist = build_id_cache__list_all(true); |
1f3736c9 MH |
860 | if (!bidlist) { |
861 | pr_debug("Failed to get buildids: %d\n", errno); | |
862 | return -EINVAL; | |
863 | } | |
864 | strlist__for_each_entry(nd, bidlist) { | |
865 | pcache = probe_cache__new(nd->s); | |
866 | if (!pcache) | |
867 | continue; | |
868 | if (!list_empty(&pcache->entries)) { | |
869 | buf = build_id_cache__origname(nd->s); | |
870 | printf("%s (%s):\n", buf, nd->s); | |
871 | free(buf); | |
872 | probe_cache__show_entries(pcache, filter); | |
873 | } | |
874 | probe_cache__delete(pcache); | |
875 | } | |
876 | strlist__delete(bidlist); | |
877 | ||
878 | return 0; | |
879 | } |