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 | { | |
136 | int ret, idx; | |
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 MH |
145 | sl = strlist__new(NULL, NULL); |
146 | ||
147 | fp = fdopen(dup(fd), "r"); | |
148 | while (!feof(fp)) { | |
149 | p = fgets(buf, MAX_CMDLEN, fp); | |
150 | if (!p) | |
151 | break; | |
152 | ||
153 | idx = strlen(p) - 1; | |
154 | if (p[idx] == '\n') | |
155 | p[idx] = '\0'; | |
156 | ret = strlist__add(sl, buf); | |
157 | if (ret < 0) { | |
158 | pr_debug("strlist__add failed (%d)\n", ret); | |
159 | strlist__delete(sl); | |
160 | return NULL; | |
161 | } | |
162 | } | |
163 | fclose(fp); | |
164 | ||
165 | return sl; | |
166 | } | |
167 | ||
168 | static struct strlist *__probe_file__get_namelist(int fd, bool include_group) | |
169 | { | |
170 | char buf[128]; | |
171 | struct strlist *sl, *rawlist; | |
172 | struct str_node *ent; | |
173 | struct probe_trace_event tev; | |
174 | int ret = 0; | |
175 | ||
176 | memset(&tev, 0, sizeof(tev)); | |
177 | rawlist = probe_file__get_rawlist(fd); | |
178 | if (!rawlist) | |
179 | return NULL; | |
180 | sl = strlist__new(NULL, NULL); | |
602a1f4d | 181 | strlist__for_each_entry(ent, rawlist) { |
92f6c72e MH |
182 | ret = parse_probe_trace_command(ent->s, &tev); |
183 | if (ret < 0) | |
184 | break; | |
185 | if (include_group) { | |
186 | ret = e_snprintf(buf, 128, "%s:%s", tev.group, | |
187 | tev.event); | |
188 | if (ret >= 0) | |
189 | ret = strlist__add(sl, buf); | |
190 | } else | |
191 | ret = strlist__add(sl, tev.event); | |
192 | clear_probe_trace_event(&tev); | |
193 | if (ret < 0) | |
194 | break; | |
195 | } | |
196 | strlist__delete(rawlist); | |
197 | ||
198 | if (ret < 0) { | |
199 | strlist__delete(sl); | |
200 | return NULL; | |
201 | } | |
202 | return sl; | |
203 | } | |
204 | ||
205 | /* Get current perf-probe event names */ | |
206 | struct strlist *probe_file__get_namelist(int fd) | |
207 | { | |
208 | return __probe_file__get_namelist(fd, false); | |
209 | } | |
210 | ||
211 | int probe_file__add_event(int fd, struct probe_trace_event *tev) | |
212 | { | |
213 | int ret = 0; | |
214 | char *buf = synthesize_probe_trace_command(tev); | |
215 | char sbuf[STRERR_BUFSIZE]; | |
216 | ||
217 | if (!buf) { | |
218 | pr_debug("Failed to synthesize probe trace event.\n"); | |
219 | return -EINVAL; | |
220 | } | |
221 | ||
222 | pr_debug("Writing event: %s\n", buf); | |
223 | if (!probe_event_dry_run) { | |
6ed0720a | 224 | if (write(fd, buf, strlen(buf)) < (int)strlen(buf)) { |
92f6c72e MH |
225 | ret = -errno; |
226 | pr_warning("Failed to write event: %s\n", | |
c8b5f2c9 | 227 | str_error_r(errno, sbuf, sizeof(sbuf))); |
92f6c72e MH |
228 | } |
229 | } | |
230 | free(buf); | |
231 | ||
232 | return ret; | |
233 | } | |
234 | ||
235 | static int __del_trace_probe_event(int fd, struct str_node *ent) | |
236 | { | |
237 | char *p; | |
238 | char buf[128]; | |
239 | int ret; | |
240 | ||
241 | /* Convert from perf-probe event to trace-probe event */ | |
242 | ret = e_snprintf(buf, 128, "-:%s", ent->s); | |
243 | if (ret < 0) | |
244 | goto error; | |
245 | ||
246 | p = strchr(buf + 2, ':'); | |
247 | if (!p) { | |
248 | pr_debug("Internal error: %s should have ':' but not.\n", | |
249 | ent->s); | |
250 | ret = -ENOTSUP; | |
251 | goto error; | |
252 | } | |
253 | *p = '/'; | |
254 | ||
255 | pr_debug("Writing event: %s\n", buf); | |
256 | ret = write(fd, buf, strlen(buf)); | |
257 | if (ret < 0) { | |
258 | ret = -errno; | |
259 | goto error; | |
260 | } | |
261 | ||
92f6c72e MH |
262 | return 0; |
263 | error: | |
264 | pr_warning("Failed to delete event: %s\n", | |
c8b5f2c9 | 265 | str_error_r(-ret, buf, sizeof(buf))); |
92f6c72e MH |
266 | return ret; |
267 | } | |
268 | ||
e607f142 NK |
269 | int probe_file__get_events(int fd, struct strfilter *filter, |
270 | struct strlist *plist) | |
92f6c72e MH |
271 | { |
272 | struct strlist *namelist; | |
273 | struct str_node *ent; | |
274 | const char *p; | |
275 | int ret = -ENOENT; | |
276 | ||
421fd084 WN |
277 | if (!plist) |
278 | return -EINVAL; | |
279 | ||
92f6c72e MH |
280 | namelist = __probe_file__get_namelist(fd, true); |
281 | if (!namelist) | |
282 | return -ENOENT; | |
283 | ||
602a1f4d | 284 | strlist__for_each_entry(ent, namelist) { |
92f6c72e MH |
285 | p = strchr(ent->s, ':'); |
286 | if ((p && strfilter__compare(filter, p + 1)) || | |
287 | strfilter__compare(filter, ent->s)) { | |
e7895e42 NK |
288 | strlist__add(plist, ent->s); |
289 | ret = 0; | |
92f6c72e MH |
290 | } |
291 | } | |
292 | strlist__delete(namelist); | |
293 | ||
294 | return ret; | |
295 | } | |
e7895e42 | 296 | |
e607f142 | 297 | int probe_file__del_strlist(int fd, struct strlist *namelist) |
e7895e42 NK |
298 | { |
299 | int ret = 0; | |
300 | struct str_node *ent; | |
301 | ||
602a1f4d | 302 | strlist__for_each_entry(ent, namelist) { |
e7895e42 NK |
303 | ret = __del_trace_probe_event(fd, ent); |
304 | if (ret < 0) | |
305 | break; | |
306 | } | |
307 | return ret; | |
308 | } | |
309 | ||
310 | int probe_file__del_events(int fd, struct strfilter *filter) | |
311 | { | |
312 | struct strlist *namelist; | |
313 | int ret; | |
314 | ||
315 | namelist = strlist__new(NULL, NULL); | |
316 | if (!namelist) | |
317 | return -ENOMEM; | |
318 | ||
319 | ret = probe_file__get_events(fd, filter, namelist); | |
320 | if (ret < 0) | |
321 | return ret; | |
322 | ||
323 | ret = probe_file__del_strlist(fd, namelist); | |
324 | strlist__delete(namelist); | |
325 | ||
326 | return ret; | |
327 | } | |
dd975497 MH |
328 | |
329 | /* Caller must ensure to remove this entry from list */ | |
330 | static void probe_cache_entry__delete(struct probe_cache_entry *entry) | |
331 | { | |
332 | if (entry) { | |
333 | BUG_ON(!list_empty(&entry->node)); | |
334 | ||
335 | strlist__delete(entry->tevlist); | |
336 | clear_perf_probe_event(&entry->pev); | |
337 | zfree(&entry->spev); | |
338 | free(entry); | |
339 | } | |
340 | } | |
341 | ||
342 | static struct probe_cache_entry * | |
343 | probe_cache_entry__new(struct perf_probe_event *pev) | |
344 | { | |
345 | struct probe_cache_entry *entry = zalloc(sizeof(*entry)); | |
346 | ||
347 | if (entry) { | |
348 | INIT_LIST_HEAD(&entry->node); | |
349 | entry->tevlist = strlist__new(NULL, NULL); | |
350 | if (!entry->tevlist) | |
351 | zfree(&entry); | |
352 | else if (pev) { | |
353 | entry->spev = synthesize_perf_probe_command(pev); | |
354 | if (!entry->spev || | |
355 | perf_probe_event__copy(&entry->pev, pev) < 0) { | |
356 | probe_cache_entry__delete(entry); | |
357 | return NULL; | |
358 | } | |
359 | } | |
360 | } | |
361 | ||
362 | return entry; | |
363 | } | |
364 | ||
365 | /* For the kernel probe caches, pass target = NULL */ | |
366 | static int probe_cache__open(struct probe_cache *pcache, const char *target) | |
367 | { | |
368 | char cpath[PATH_MAX]; | |
369 | char sbuildid[SBUILD_ID_SIZE]; | |
1f3736c9 | 370 | char *dir_name = NULL; |
dd975497 MH |
371 | bool is_kallsyms = !target; |
372 | int ret, fd; | |
373 | ||
1f3736c9 MH |
374 | if (target && build_id_cache__cached(target)) { |
375 | /* This is a cached buildid */ | |
376 | strncpy(sbuildid, target, SBUILD_ID_SIZE); | |
377 | dir_name = build_id_cache__linkname(sbuildid, NULL, 0); | |
378 | goto found; | |
379 | } | |
380 | ||
dd975497 MH |
381 | if (target) |
382 | ret = filename__sprintf_build_id(target, sbuildid); | |
383 | else { | |
384 | target = DSO__NAME_KALLSYMS; | |
385 | ret = sysfs__sprintf_build_id("/", sbuildid); | |
386 | } | |
387 | if (ret < 0) { | |
388 | pr_debug("Failed to get build-id from %s.\n", target); | |
389 | return ret; | |
390 | } | |
391 | ||
392 | /* If we have no buildid cache, make it */ | |
393 | if (!build_id_cache__cached(sbuildid)) { | |
394 | ret = build_id_cache__add_s(sbuildid, target, | |
395 | is_kallsyms, NULL); | |
396 | if (ret < 0) { | |
397 | pr_debug("Failed to add build-id cache: %s\n", target); | |
398 | return ret; | |
399 | } | |
400 | } | |
401 | ||
402 | dir_name = build_id_cache__cachedir(sbuildid, target, is_kallsyms, | |
403 | false); | |
1f3736c9 MH |
404 | found: |
405 | if (!dir_name) { | |
406 | pr_debug("Failed to get cache from %s\n", target); | |
dd975497 | 407 | return -ENOMEM; |
1f3736c9 | 408 | } |
dd975497 MH |
409 | |
410 | snprintf(cpath, PATH_MAX, "%s/probes", dir_name); | |
411 | fd = open(cpath, O_CREAT | O_RDWR, 0644); | |
412 | if (fd < 0) | |
413 | pr_debug("Failed to open cache(%d): %s\n", fd, cpath); | |
414 | free(dir_name); | |
415 | pcache->fd = fd; | |
416 | ||
417 | return fd; | |
418 | } | |
419 | ||
420 | static int probe_cache__load(struct probe_cache *pcache) | |
421 | { | |
422 | struct probe_cache_entry *entry = NULL; | |
423 | char buf[MAX_CMDLEN], *p; | |
424 | int ret = 0; | |
425 | FILE *fp; | |
426 | ||
427 | fp = fdopen(dup(pcache->fd), "r"); | |
428 | if (!fp) | |
429 | return -EINVAL; | |
430 | ||
431 | while (!feof(fp)) { | |
432 | if (!fgets(buf, MAX_CMDLEN, fp)) | |
433 | break; | |
434 | p = strchr(buf, '\n'); | |
435 | if (p) | |
436 | *p = '\0'; | |
6430a94e MH |
437 | /* #perf_probe_event or %sdt_event */ |
438 | if (buf[0] == '#' || buf[0] == '%') { | |
dd975497 MH |
439 | entry = probe_cache_entry__new(NULL); |
440 | if (!entry) { | |
441 | ret = -ENOMEM; | |
442 | goto out; | |
443 | } | |
6430a94e MH |
444 | if (buf[0] == '%') |
445 | entry->sdt = true; | |
dd975497 MH |
446 | entry->spev = strdup(buf + 1); |
447 | if (entry->spev) | |
448 | ret = parse_perf_probe_command(buf + 1, | |
449 | &entry->pev); | |
450 | else | |
451 | ret = -ENOMEM; | |
452 | if (ret < 0) { | |
453 | probe_cache_entry__delete(entry); | |
454 | goto out; | |
455 | } | |
456 | list_add_tail(&entry->node, &pcache->entries); | |
457 | } else { /* trace_probe_event */ | |
458 | if (!entry) { | |
459 | ret = -EINVAL; | |
460 | goto out; | |
461 | } | |
462 | strlist__add(entry->tevlist, buf); | |
463 | } | |
464 | } | |
465 | out: | |
466 | fclose(fp); | |
467 | return ret; | |
468 | } | |
469 | ||
470 | static struct probe_cache *probe_cache__alloc(void) | |
471 | { | |
472 | struct probe_cache *pcache = zalloc(sizeof(*pcache)); | |
473 | ||
474 | if (pcache) { | |
475 | INIT_LIST_HEAD(&pcache->entries); | |
476 | pcache->fd = -EINVAL; | |
477 | } | |
478 | return pcache; | |
479 | } | |
480 | ||
481 | void probe_cache__purge(struct probe_cache *pcache) | |
482 | { | |
483 | struct probe_cache_entry *entry, *n; | |
484 | ||
485 | list_for_each_entry_safe(entry, n, &pcache->entries, node) { | |
486 | list_del_init(&entry->node); | |
487 | probe_cache_entry__delete(entry); | |
488 | } | |
489 | } | |
490 | ||
491 | void probe_cache__delete(struct probe_cache *pcache) | |
492 | { | |
493 | if (!pcache) | |
494 | return; | |
495 | ||
496 | probe_cache__purge(pcache); | |
497 | if (pcache->fd > 0) | |
498 | close(pcache->fd); | |
499 | free(pcache); | |
500 | } | |
501 | ||
502 | struct probe_cache *probe_cache__new(const char *target) | |
503 | { | |
504 | struct probe_cache *pcache = probe_cache__alloc(); | |
505 | int ret; | |
506 | ||
507 | if (!pcache) | |
508 | return NULL; | |
509 | ||
510 | ret = probe_cache__open(pcache, target); | |
511 | if (ret < 0) { | |
512 | pr_debug("Cache open error: %d\n", ret); | |
513 | goto out_err; | |
514 | } | |
515 | ||
516 | ret = probe_cache__load(pcache); | |
517 | if (ret < 0) { | |
518 | pr_debug("Cache read error: %d\n", ret); | |
519 | goto out_err; | |
520 | } | |
521 | ||
522 | return pcache; | |
523 | ||
524 | out_err: | |
525 | probe_cache__delete(pcache); | |
526 | return NULL; | |
527 | } | |
528 | ||
529 | static bool streql(const char *a, const char *b) | |
530 | { | |
531 | if (a == b) | |
532 | return true; | |
533 | ||
534 | if (!a || !b) | |
535 | return false; | |
536 | ||
537 | return !strcmp(a, b); | |
538 | } | |
539 | ||
bc062230 | 540 | struct probe_cache_entry * |
dd975497 MH |
541 | probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev) |
542 | { | |
543 | struct probe_cache_entry *entry = NULL; | |
544 | char *cmd = synthesize_perf_probe_command(pev); | |
545 | ||
546 | if (!cmd) | |
547 | return NULL; | |
548 | ||
549 | list_for_each_entry(entry, &pcache->entries, node) { | |
550 | /* Hit if same event name or same command-string */ | |
551 | if ((pev->event && | |
552 | (streql(entry->pev.group, pev->group) && | |
553 | streql(entry->pev.event, pev->event))) || | |
554 | (!strcmp(entry->spev, cmd))) | |
555 | goto found; | |
556 | } | |
557 | entry = NULL; | |
558 | ||
559 | found: | |
560 | free(cmd); | |
561 | return entry; | |
562 | } | |
563 | ||
bc062230 MH |
564 | struct probe_cache_entry * |
565 | probe_cache__find_by_name(struct probe_cache *pcache, | |
566 | const char *group, const char *event) | |
567 | { | |
568 | struct probe_cache_entry *entry = NULL; | |
569 | ||
570 | list_for_each_entry(entry, &pcache->entries, node) { | |
571 | /* Hit if same event name or same command-string */ | |
572 | if (streql(entry->pev.group, group) && | |
573 | streql(entry->pev.event, event)) | |
574 | goto found; | |
575 | } | |
576 | entry = NULL; | |
577 | ||
578 | found: | |
579 | return entry; | |
580 | } | |
581 | ||
dd975497 MH |
582 | int probe_cache__add_entry(struct probe_cache *pcache, |
583 | struct perf_probe_event *pev, | |
584 | struct probe_trace_event *tevs, int ntevs) | |
585 | { | |
586 | struct probe_cache_entry *entry = NULL; | |
587 | char *command; | |
588 | int i, ret = 0; | |
589 | ||
590 | if (!pcache || !pev || !tevs || ntevs <= 0) { | |
591 | ret = -EINVAL; | |
592 | goto out_err; | |
593 | } | |
594 | ||
595 | /* Remove old cache entry */ | |
596 | entry = probe_cache__find(pcache, pev); | |
597 | if (entry) { | |
598 | list_del_init(&entry->node); | |
599 | probe_cache_entry__delete(entry); | |
600 | } | |
601 | ||
602 | ret = -ENOMEM; | |
603 | entry = probe_cache_entry__new(pev); | |
604 | if (!entry) | |
605 | goto out_err; | |
606 | ||
607 | for (i = 0; i < ntevs; i++) { | |
608 | if (!tevs[i].point.symbol) | |
609 | continue; | |
610 | ||
611 | command = synthesize_probe_trace_command(&tevs[i]); | |
612 | if (!command) | |
613 | goto out_err; | |
614 | strlist__add(entry->tevlist, command); | |
615 | free(command); | |
616 | } | |
617 | list_add_tail(&entry->node, &pcache->entries); | |
618 | pr_debug("Added probe cache: %d\n", ntevs); | |
619 | return 0; | |
620 | ||
621 | out_err: | |
622 | pr_debug("Failed to add probe caches\n"); | |
623 | probe_cache_entry__delete(entry); | |
624 | return ret; | |
625 | } | |
626 | ||
6430a94e MH |
627 | static unsigned long long sdt_note__get_addr(struct sdt_note *note) |
628 | { | |
629 | return note->bit32 ? (unsigned long long)note->addr.a32[0] | |
630 | : (unsigned long long)note->addr.a64[0]; | |
631 | } | |
632 | ||
633 | int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname) | |
634 | { | |
635 | struct probe_cache_entry *entry = NULL; | |
636 | struct list_head sdtlist; | |
637 | struct sdt_note *note; | |
638 | char *buf; | |
639 | char sdtgrp[64]; | |
640 | int ret; | |
641 | ||
642 | INIT_LIST_HEAD(&sdtlist); | |
643 | ret = get_sdt_note_list(&sdtlist, pathname); | |
644 | if (ret < 0) { | |
645 | pr_debug("Failed to get sdt note: %d\n", ret); | |
646 | return ret; | |
647 | } | |
648 | list_for_each_entry(note, &sdtlist, note_list) { | |
649 | ret = snprintf(sdtgrp, 64, "sdt_%s", note->provider); | |
650 | if (ret < 0) | |
651 | break; | |
652 | /* Try to find same-name entry */ | |
653 | entry = probe_cache__find_by_name(pcache, sdtgrp, note->name); | |
654 | if (!entry) { | |
655 | entry = probe_cache_entry__new(NULL); | |
656 | if (!entry) { | |
657 | ret = -ENOMEM; | |
658 | break; | |
659 | } | |
660 | entry->sdt = true; | |
661 | ret = asprintf(&entry->spev, "%s:%s=%s", sdtgrp, | |
662 | note->name, note->name); | |
663 | if (ret < 0) | |
664 | break; | |
665 | entry->pev.event = strdup(note->name); | |
666 | entry->pev.group = strdup(sdtgrp); | |
667 | list_add_tail(&entry->node, &pcache->entries); | |
668 | } | |
669 | ret = asprintf(&buf, "p:%s/%s %s:0x%llx", | |
670 | sdtgrp, note->name, pathname, | |
671 | sdt_note__get_addr(note)); | |
672 | if (ret < 0) | |
673 | break; | |
674 | strlist__add(entry->tevlist, buf); | |
675 | free(buf); | |
676 | entry = NULL; | |
677 | } | |
678 | if (entry) { | |
679 | list_del_init(&entry->node); | |
680 | probe_cache_entry__delete(entry); | |
681 | } | |
682 | cleanup_sdt_note_list(&sdtlist); | |
683 | return ret; | |
684 | } | |
685 | ||
dd975497 MH |
686 | static int probe_cache_entry__write(struct probe_cache_entry *entry, int fd) |
687 | { | |
688 | struct str_node *snode; | |
689 | struct stat st; | |
690 | struct iovec iov[3]; | |
6430a94e | 691 | const char *prefix = entry->sdt ? "%" : "#"; |
dd975497 MH |
692 | int ret; |
693 | /* Save stat for rollback */ | |
694 | ret = fstat(fd, &st); | |
695 | if (ret < 0) | |
696 | return ret; | |
697 | ||
6430a94e MH |
698 | pr_debug("Writing cache: %s%s\n", prefix, entry->spev); |
699 | iov[0].iov_base = (void *)prefix; iov[0].iov_len = 1; | |
dd975497 MH |
700 | iov[1].iov_base = entry->spev; iov[1].iov_len = strlen(entry->spev); |
701 | iov[2].iov_base = (void *)"\n"; iov[2].iov_len = 1; | |
702 | ret = writev(fd, iov, 3); | |
703 | if (ret < (int)iov[1].iov_len + 2) | |
704 | goto rollback; | |
705 | ||
602a1f4d | 706 | strlist__for_each_entry(snode, entry->tevlist) { |
dd975497 MH |
707 | iov[0].iov_base = (void *)snode->s; |
708 | iov[0].iov_len = strlen(snode->s); | |
709 | iov[1].iov_base = (void *)"\n"; iov[1].iov_len = 1; | |
710 | ret = writev(fd, iov, 2); | |
711 | if (ret < (int)iov[0].iov_len + 1) | |
712 | goto rollback; | |
713 | } | |
714 | return 0; | |
715 | ||
716 | rollback: | |
717 | /* Rollback to avoid cache file corruption */ | |
718 | if (ret > 0) | |
719 | ret = -1; | |
720 | if (ftruncate(fd, st.st_size) < 0) | |
721 | ret = -2; | |
722 | ||
723 | return ret; | |
724 | } | |
725 | ||
726 | int probe_cache__commit(struct probe_cache *pcache) | |
727 | { | |
728 | struct probe_cache_entry *entry; | |
729 | int ret = 0; | |
730 | ||
731 | /* TBD: if we do not update existing entries, skip it */ | |
732 | ret = lseek(pcache->fd, 0, SEEK_SET); | |
733 | if (ret < 0) | |
734 | goto out; | |
735 | ||
736 | ret = ftruncate(pcache->fd, 0); | |
737 | if (ret < 0) | |
738 | goto out; | |
739 | ||
740 | list_for_each_entry(entry, &pcache->entries, node) { | |
741 | ret = probe_cache_entry__write(entry, pcache->fd); | |
742 | pr_debug("Cache committed: %d\n", ret); | |
743 | if (ret < 0) | |
744 | break; | |
745 | } | |
746 | out: | |
747 | return ret; | |
748 | } | |
1f3736c9 | 749 | |
4a0f65c1 MH |
750 | static bool probe_cache_entry__compare(struct probe_cache_entry *entry, |
751 | struct strfilter *filter) | |
752 | { | |
753 | char buf[128], *ptr = entry->spev; | |
754 | ||
755 | if (entry->pev.event) { | |
756 | snprintf(buf, 128, "%s:%s", entry->pev.group, entry->pev.event); | |
757 | ptr = buf; | |
758 | } | |
759 | return strfilter__compare(filter, ptr); | |
760 | } | |
761 | ||
762 | int probe_cache__filter_purge(struct probe_cache *pcache, | |
763 | struct strfilter *filter) | |
764 | { | |
765 | struct probe_cache_entry *entry, *tmp; | |
766 | ||
767 | list_for_each_entry_safe(entry, tmp, &pcache->entries, node) { | |
768 | if (probe_cache_entry__compare(entry, filter)) { | |
769 | pr_info("Removed cached event: %s\n", entry->spev); | |
770 | list_del_init(&entry->node); | |
771 | probe_cache_entry__delete(entry); | |
772 | } | |
773 | } | |
774 | return 0; | |
775 | } | |
776 | ||
1f3736c9 MH |
777 | static int probe_cache__show_entries(struct probe_cache *pcache, |
778 | struct strfilter *filter) | |
779 | { | |
780 | struct probe_cache_entry *entry; | |
1f3736c9 MH |
781 | |
782 | list_for_each_entry(entry, &pcache->entries, node) { | |
4a0f65c1 | 783 | if (probe_cache_entry__compare(entry, filter)) |
1f3736c9 MH |
784 | printf("%s\n", entry->spev); |
785 | } | |
786 | return 0; | |
787 | } | |
788 | ||
789 | /* Show all cached probes */ | |
790 | int probe_cache__show_all_caches(struct strfilter *filter) | |
791 | { | |
792 | struct probe_cache *pcache; | |
793 | struct strlist *bidlist; | |
794 | struct str_node *nd; | |
795 | char *buf = strfilter__string(filter); | |
796 | ||
797 | pr_debug("list cache with filter: %s\n", buf); | |
798 | free(buf); | |
799 | ||
800 | bidlist = build_id_cache__list_all(); | |
801 | if (!bidlist) { | |
802 | pr_debug("Failed to get buildids: %d\n", errno); | |
803 | return -EINVAL; | |
804 | } | |
805 | strlist__for_each_entry(nd, bidlist) { | |
806 | pcache = probe_cache__new(nd->s); | |
807 | if (!pcache) | |
808 | continue; | |
809 | if (!list_empty(&pcache->entries)) { | |
810 | buf = build_id_cache__origname(nd->s); | |
811 | printf("%s (%s):\n", buf, nd->s); | |
812 | free(buf); | |
813 | probe_cache__show_entries(pcache, filter); | |
814 | } | |
815 | probe_cache__delete(pcache); | |
816 | } | |
817 | strlist__delete(bidlist); | |
818 | ||
819 | return 0; | |
820 | } |