Merge tag 'char-misc-4.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[deliverable/linux.git] / tools / perf / util / trace-event-info.c
CommitLineData
52050943
SR
1/*
2 * Copyright (C) 2008,2009, Steven Rostedt <srostedt@redhat.com>
3 *
4 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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; version 2 of the License (not later!)
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 */
c168fbfb 21#include "util.h"
52050943 22#include <dirent.h>
659d8cfb 23#include <mntent.h>
52050943
SR
24#include <stdio.h>
25#include <stdlib.h>
26#include <string.h>
27#include <stdarg.h>
28#include <sys/types.h>
29#include <sys/stat.h>
30#include <sys/wait.h>
31#include <pthread.h>
32#include <fcntl.h>
33#include <unistd.h>
52050943 34#include <errno.h>
1ef2ed10 35#include <stdbool.h>
69aad6f1 36#include <linux/list.h>
e2561368 37#include <linux/kernel.h>
52050943 38
1ef2ed10 39#include "../perf.h"
52050943 40#include "trace-event.h"
553873e1 41#include <api/fs/debugfs.h>
69aad6f1 42#include "evsel.h"
84f5d36f 43#include "debug.h"
52050943 44
52050943
SR
45#define VERSION "0.5"
46
52050943
SR
47static int output_fd;
48
52050943 49
52050943
SR
50int bigendian(void)
51{
52 unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
53 unsigned int *ptr;
54
65014ab3 55 ptr = (unsigned int *)(void *)str;
52050943
SR
56 return *ptr == 0x01020304;
57}
58
259032bf 59/* unfortunately, you can not stat debugfs or proc files for size */
8755d5e2 60static int record_file(const char *file, ssize_t hdr_sz)
52050943
SR
61{
62 unsigned long long size = 0;
259032bf
SR
63 char buf[BUFSIZ], *sizep;
64 off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
65 int r, fd;
8755d5e2 66 int err = -EIO;
52050943
SR
67
68 fd = open(file, O_RDONLY);
7f42b950
NK
69 if (fd < 0) {
70 pr_debug("Can't read '%s'", file);
71 return -errno;
72 }
52050943 73
259032bf 74 /* put in zeros for file size, then fill true size later */
8755d5e2
NK
75 if (hdr_sz) {
76 if (write(output_fd, &size, hdr_sz) != hdr_sz)
77 goto out;
78 }
52050943
SR
79
80 do {
81 r = read(fd, buf, BUFSIZ);
259032bf 82 if (r > 0) {
52050943 83 size += r;
8755d5e2
NK
84 if (write(output_fd, buf, r) != r)
85 goto out;
259032bf 86 }
52050943 87 } while (r > 0);
52050943 88
259032bf
SR
89 /* ugh, handle big-endian hdr_size == 4 */
90 sizep = (char*)&size;
91 if (bigendian())
92 sizep += sizeof(u64) - hdr_sz;
93
7f42b950
NK
94 if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0) {
95 pr_debug("writing file size failed\n");
96 goto out;
97 }
8755d5e2
NK
98
99 err = 0;
100out:
101 close(fd);
102 return err;
52050943
SR
103}
104
077f159d 105static int record_header_files(void)
52050943 106{
52050943 107 char *path;
259032bf 108 struct stat st;
8755d5e2 109 int err = -EIO;
52050943
SR
110
111 path = get_tracing_file("events/header_page");
7f42b950
NK
112 if (!path) {
113 pr_debug("can't get tracing/events/header_page");
114 return -ENOMEM;
115 }
454f8c7d 116
7f42b950
NK
117 if (stat(path, &st) < 0) {
118 pr_debug("can't read '%s'", path);
119 goto out;
120 }
52050943 121
8755d5e2
NK
122 if (write(output_fd, "header_page", 12) != 12) {
123 pr_debug("can't write header_page\n");
124 goto out;
125 }
126
127 if (record_file(path, 8) < 0) {
128 pr_debug("can't record header_page file\n");
129 goto out;
130 }
131
52050943
SR
132 put_tracing_file(path);
133
134 path = get_tracing_file("events/header_event");
7f42b950
NK
135 if (!path) {
136 pr_debug("can't get tracing/events/header_event");
137 err = -ENOMEM;
138 goto out;
139 }
454f8c7d 140
7f42b950
NK
141 if (stat(path, &st) < 0) {
142 pr_debug("can't read '%s'", path);
143 goto out;
144 }
52050943 145
8755d5e2
NK
146 if (write(output_fd, "header_event", 13) != 13) {
147 pr_debug("can't write header_event\n");
148 goto out;
149 }
150
151 if (record_file(path, 8) < 0) {
152 pr_debug("can't record header_event file\n");
153 goto out;
154 }
155
156 err = 0;
157out:
52050943 158 put_tracing_file(path);
8755d5e2 159 return err;
52050943
SR
160}
161
1ef2ed10
FW
162static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
163{
164 while (tps) {
165 if (!strcmp(sys, tps->name))
166 return true;
167 tps = tps->next;
168 }
169
170 return false;
171}
172
5a6fd27a 173static int copy_event_system(const char *sys, struct tracepoint_path *tps)
52050943 174{
52050943
SR
175 struct dirent *dent;
176 struct stat st;
177 char *format;
178 DIR *dir;
179 int count = 0;
180 int ret;
5a6fd27a 181 int err;
52050943
SR
182
183 dir = opendir(sys);
7f42b950
NK
184 if (!dir) {
185 pr_debug("can't read directory '%s'", sys);
186 return -errno;
187 }
52050943
SR
188
189 while ((dent = readdir(dir))) {
659d8cfb
UD
190 if (dent->d_type != DT_DIR ||
191 strcmp(dent->d_name, ".") == 0 ||
1ef2ed10
FW
192 strcmp(dent->d_name, "..") == 0 ||
193 !name_in_tp_list(dent->d_name, tps))
52050943 194 continue;
d400a68d 195 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
5a6fd27a
NK
196 err = -ENOMEM;
197 goto out;
198 }
52050943
SR
199 ret = stat(format, &st);
200 free(format);
201 if (ret < 0)
202 continue;
203 count++;
204 }
205
8755d5e2
NK
206 if (write(output_fd, &count, 4) != 4) {
207 err = -EIO;
208 pr_debug("can't write count\n");
209 goto out;
210 }
52050943
SR
211
212 rewinddir(dir);
213 while ((dent = readdir(dir))) {
659d8cfb
UD
214 if (dent->d_type != DT_DIR ||
215 strcmp(dent->d_name, ".") == 0 ||
1ef2ed10
FW
216 strcmp(dent->d_name, "..") == 0 ||
217 !name_in_tp_list(dent->d_name, tps))
52050943 218 continue;
d400a68d 219 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
5a6fd27a
NK
220 err = -ENOMEM;
221 goto out;
222 }
52050943
SR
223 ret = stat(format, &st);
224
8755d5e2
NK
225 if (ret >= 0) {
226 err = record_file(format, 8);
227 if (err) {
228 free(format);
229 goto out;
230 }
231 }
52050943
SR
232 free(format);
233 }
5a6fd27a
NK
234 err = 0;
235out:
9967411e 236 closedir(dir);
5a6fd27a 237 return err;
52050943
SR
238}
239
077f159d 240static int record_ftrace_files(struct tracepoint_path *tps)
52050943
SR
241{
242 char *path;
8755d5e2 243 int ret;
52050943
SR
244
245 path = get_tracing_file("events/ftrace");
7f42b950
NK
246 if (!path) {
247 pr_debug("can't get tracing/events/ftrace");
248 return -ENOMEM;
249 }
52050943 250
8755d5e2 251 ret = copy_event_system(path, tps);
52050943
SR
252
253 put_tracing_file(path);
8755d5e2
NK
254
255 return ret;
52050943
SR
256}
257
1ef2ed10
FW
258static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
259{
260 while (tps) {
261 if (!strcmp(sys, tps->system))
262 return true;
263 tps = tps->next;
264 }
265
266 return false;
267}
268
077f159d 269static int record_event_files(struct tracepoint_path *tps)
52050943
SR
270{
271 struct dirent *dent;
272 struct stat st;
273 char *path;
274 char *sys;
275 DIR *dir;
276 int count = 0;
277 int ret;
5a6fd27a 278 int err;
52050943
SR
279
280 path = get_tracing_file("events");
7f42b950
NK
281 if (!path) {
282 pr_debug("can't get tracing/events");
283 return -ENOMEM;
284 }
52050943
SR
285
286 dir = opendir(path);
7f42b950
NK
287 if (!dir) {
288 err = -errno;
289 pr_debug("can't read directory '%s'", path);
290 goto out;
291 }
52050943
SR
292
293 while ((dent = readdir(dir))) {
659d8cfb
UD
294 if (dent->d_type != DT_DIR ||
295 strcmp(dent->d_name, ".") == 0 ||
52050943 296 strcmp(dent->d_name, "..") == 0 ||
1ef2ed10
FW
297 strcmp(dent->d_name, "ftrace") == 0 ||
298 !system_in_tp_list(dent->d_name, tps))
52050943 299 continue;
659d8cfb 300 count++;
52050943
SR
301 }
302
8755d5e2
NK
303 if (write(output_fd, &count, 4) != 4) {
304 err = -EIO;
305 pr_debug("can't write count\n");
306 goto out;
307 }
52050943
SR
308
309 rewinddir(dir);
310 while ((dent = readdir(dir))) {
659d8cfb
UD
311 if (dent->d_type != DT_DIR ||
312 strcmp(dent->d_name, ".") == 0 ||
52050943 313 strcmp(dent->d_name, "..") == 0 ||
1ef2ed10
FW
314 strcmp(dent->d_name, "ftrace") == 0 ||
315 !system_in_tp_list(dent->d_name, tps))
52050943 316 continue;
d400a68d 317 if (asprintf(&sys, "%s/%s", path, dent->d_name) < 0) {
5a6fd27a
NK
318 err = -ENOMEM;
319 goto out;
320 }
52050943
SR
321 ret = stat(sys, &st);
322 if (ret >= 0) {
8755d5e2
NK
323 ssize_t size = strlen(dent->d_name) + 1;
324
325 if (write(output_fd, dent->d_name, size) != size ||
326 copy_event_system(sys, tps) < 0) {
327 err = -EIO;
328 free(sys);
329 goto out;
330 }
52050943
SR
331 }
332 free(sys);
333 }
5a6fd27a
NK
334 err = 0;
335out:
9967411e 336 closedir(dir);
52050943 337 put_tracing_file(path);
5a6fd27a
NK
338
339 return err;
52050943
SR
340}
341
077f159d 342static int record_proc_kallsyms(void)
52050943 343{
259032bf 344 unsigned int size;
52050943
SR
345 const char *path = "/proc/kallsyms";
346 struct stat st;
8755d5e2 347 int ret, err = 0;
52050943
SR
348
349 ret = stat(path, &st);
350 if (ret < 0) {
351 /* not found */
352 size = 0;
8755d5e2
NK
353 if (write(output_fd, &size, 4) != 4)
354 err = -EIO;
355 return err;
52050943 356 }
8755d5e2 357 return record_file(path, 4);
52050943
SR
358}
359
077f159d 360static int record_ftrace_printk(void)
52050943 361{
259032bf 362 unsigned int size;
6706ccf8 363 char *path;
52050943 364 struct stat st;
8755d5e2 365 int ret, err = 0;
52050943
SR
366
367 path = get_tracing_file("printk_formats");
7f42b950
NK
368 if (!path) {
369 pr_debug("can't get tracing/printk_formats");
370 return -ENOMEM;
371 }
454f8c7d 372
52050943
SR
373 ret = stat(path, &st);
374 if (ret < 0) {
375 /* not found */
376 size = 0;
8755d5e2
NK
377 if (write(output_fd, &size, 4) != 4)
378 err = -EIO;
6706ccf8 379 goto out;
52050943 380 }
8755d5e2 381 err = record_file(path, 4);
259032bf 382
6706ccf8
LZ
383out:
384 put_tracing_file(path);
8755d5e2 385 return err;
52050943
SR
386}
387
7f42b950
NK
388static void
389put_tracepoints_path(struct tracepoint_path *tps)
390{
391 while (tps) {
392 struct tracepoint_path *t = tps;
393
394 tps = tps->next;
74cf249d
ACM
395 zfree(&t->name);
396 zfree(&t->system);
7f42b950
NK
397 free(t);
398 }
399}
400
1ef2ed10 401static struct tracepoint_path *
69aad6f1 402get_tracepoints_path(struct list_head *pattrs)
1ef2ed10
FW
403{
404 struct tracepoint_path path, *ppath = &path;
69aad6f1
ACM
405 struct perf_evsel *pos;
406 int nr_tracepoints = 0;
1ef2ed10 407
69aad6f1
ACM
408 list_for_each_entry(pos, pattrs, node) {
409 if (pos->attr.type != PERF_TYPE_TRACEPOINT)
1ef2ed10 410 continue;
e2561368 411 ++nr_tracepoints;
e7c93f09
NK
412
413 if (pos->name) {
414 ppath->next = tracepoint_name_to_path(pos->name);
415 if (ppath->next)
416 goto next;
417
418 if (strchr(pos->name, ':') == NULL)
419 goto try_id;
420
421 goto error;
422 }
423
424try_id:
69aad6f1 425 ppath->next = tracepoint_id_to_path(pos->attr.config);
7f42b950 426 if (!ppath->next) {
e7c93f09 427error:
7f42b950
NK
428 pr_debug("No memory to alloc tracepoints list\n");
429 put_tracepoints_path(&path);
430 return NULL;
431 }
e7c93f09 432next:
1ef2ed10
FW
433 ppath = ppath->next;
434 }
435
e2561368 436 return nr_tracepoints > 0 ? path.next : NULL;
1ef2ed10 437}
e2561368 438
69aad6f1 439bool have_tracepoints(struct list_head *pattrs)
63e0c771 440{
69aad6f1 441 struct perf_evsel *pos;
db620b1c 442
69aad6f1
ACM
443 list_for_each_entry(pos, pattrs, node)
444 if (pos->attr.type == PERF_TYPE_TRACEPOINT)
db620b1c
TZ
445 return true;
446
447 return false;
63e0c771
TZ
448}
449
8755d5e2 450static int tracing_data_header(void)
52050943 451{
29208e57 452 char buf[20];
8755d5e2 453 ssize_t size;
52050943 454
29208e57 455 /* just guessing this is someone's birthday.. ;) */
52050943
SR
456 buf[0] = 23;
457 buf[1] = 8;
458 buf[2] = 68;
459 memcpy(buf + 3, "tracing", 7);
460
8755d5e2
NK
461 if (write(output_fd, buf, 10) != 10)
462 return -1;
52050943 463
8755d5e2
NK
464 size = strlen(VERSION) + 1;
465 if (write(output_fd, VERSION, size) != size)
466 return -1;
52050943
SR
467
468 /* save endian */
469 if (bigendian())
470 buf[0] = 1;
471 else
472 buf[0] = 0;
473
8755d5e2
NK
474 if (write(output_fd, buf, 1) != 1)
475 return -1;
52050943
SR
476
477 /* save size of long */
478 buf[0] = sizeof(long);
8755d5e2
NK
479 if (write(output_fd, buf, 1) != 1)
480 return -1;
52050943
SR
481
482 /* save page_size */
8755d5e2
NK
483 if (write(output_fd, &page_size, 4) != 4)
484 return -1;
485
486 return 0;
29208e57
JO
487}
488
489struct tracing_data *tracing_data_get(struct list_head *pattrs,
490 int fd, bool temp)
491{
492 struct tracepoint_path *tps;
493 struct tracing_data *tdata;
8755d5e2 494 int err;
29208e57
JO
495
496 output_fd = fd;
497
498 tps = get_tracepoints_path(pattrs);
499 if (!tps)
500 return NULL;
52050943 501
5a6fd27a
NK
502 tdata = malloc(sizeof(*tdata));
503 if (!tdata)
504 return NULL;
505
29208e57
JO
506 tdata->temp = temp;
507 tdata->size = 0;
508
509 if (temp) {
510 int temp_fd;
511
512 snprintf(tdata->temp_file, sizeof(tdata->temp_file),
513 "/tmp/perf-XXXXXX");
7f42b950
NK
514 if (!mkstemp(tdata->temp_file)) {
515 pr_debug("Can't make temp file");
516 return NULL;
517 }
29208e57
JO
518
519 temp_fd = open(tdata->temp_file, O_RDWR);
7f42b950
NK
520 if (temp_fd < 0) {
521 pr_debug("Can't read '%s'", tdata->temp_file);
522 return NULL;
523 }
29208e57
JO
524
525 /*
526 * Set the temp file the default output, so all the
527 * tracing data are stored into it.
528 */
529 output_fd = temp_fd;
530 }
531
8755d5e2
NK
532 err = tracing_data_header();
533 if (err)
534 goto out;
077f159d 535 err = record_header_files();
8755d5e2
NK
536 if (err)
537 goto out;
077f159d 538 err = record_ftrace_files(tps);
8755d5e2
NK
539 if (err)
540 goto out;
077f159d 541 err = record_event_files(tps);
8755d5e2
NK
542 if (err)
543 goto out;
077f159d 544 err = record_proc_kallsyms();
8755d5e2
NK
545 if (err)
546 goto out;
077f159d 547 err = record_ftrace_printk();
e2561368 548
8755d5e2 549out:
29208e57
JO
550 /*
551 * All tracing data are stored by now, we can restore
552 * the default output file in case we used temp file.
553 */
554 if (temp) {
555 tdata->size = lseek(output_fd, 0, SEEK_CUR);
556 close(output_fd);
557 output_fd = fd;
558 }
559
04662523
ACM
560 if (err)
561 zfree(&tdata);
8755d5e2 562
29208e57
JO
563 put_tracepoints_path(tps);
564 return tdata;
52050943 565}
9215545e 566
8755d5e2 567int tracing_data_put(struct tracing_data *tdata)
9215545e 568{
8755d5e2
NK
569 int err = 0;
570
29208e57 571 if (tdata->temp) {
8755d5e2 572 err = record_file(tdata->temp_file, 0);
29208e57
JO
573 unlink(tdata->temp_file);
574 }
9215545e 575
29208e57 576 free(tdata);
8755d5e2 577 return err;
29208e57 578}
9215545e 579
29208e57
JO
580int read_tracing_data(int fd, struct list_head *pattrs)
581{
8755d5e2 582 int err;
29208e57 583 struct tracing_data *tdata;
9215545e 584
29208e57
JO
585 /*
586 * We work over the real file, so we can write data
587 * directly, no temp file is needed.
588 */
589 tdata = tracing_data_get(pattrs, fd, false);
590 if (!tdata)
591 return -ENOMEM;
592
8755d5e2
NK
593 err = tracing_data_put(tdata);
594 return err;
9215545e 595}
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