Loading...
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 */
21#include "util.h"
22#include <dirent.h>
23#include <mntent.h>
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 <fcntl.h>
32#include <unistd.h>
33#include <errno.h>
34#include <stdbool.h>
35#include <linux/list.h>
36#include <linux/kernel.h>
37
38#include "../perf.h"
39#include "trace-event.h"
40#include <api/fs/tracing_path.h>
41#include "evsel.h"
42#include "debug.h"
43
44#define VERSION "0.6"
45
46static int output_fd;
47
48
49int bigendian(void)
50{
51 unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
52 unsigned int *ptr;
53
54 ptr = (unsigned int *)(void *)str;
55 return *ptr == 0x01020304;
56}
57
58/* unfortunately, you can not stat debugfs or proc files for size */
59static int record_file(const char *file, ssize_t hdr_sz)
60{
61 unsigned long long size = 0;
62 char buf[BUFSIZ], *sizep;
63 off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
64 int r, fd;
65 int err = -EIO;
66
67 fd = open(file, O_RDONLY);
68 if (fd < 0) {
69 pr_debug("Can't read '%s'", file);
70 return -errno;
71 }
72
73 /* put in zeros for file size, then fill true size later */
74 if (hdr_sz) {
75 if (write(output_fd, &size, hdr_sz) != hdr_sz)
76 goto out;
77 }
78
79 do {
80 r = read(fd, buf, BUFSIZ);
81 if (r > 0) {
82 size += r;
83 if (write(output_fd, buf, r) != r)
84 goto out;
85 }
86 } while (r > 0);
87
88 /* ugh, handle big-endian hdr_size == 4 */
89 sizep = (char*)&size;
90 if (bigendian())
91 sizep += sizeof(u64) - hdr_sz;
92
93 if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0) {
94 pr_debug("writing file size failed\n");
95 goto out;
96 }
97
98 err = 0;
99out:
100 close(fd);
101 return err;
102}
103
104static int record_header_files(void)
105{
106 char *path;
107 struct stat st;
108 int err = -EIO;
109
110 path = get_tracing_file("events/header_page");
111 if (!path) {
112 pr_debug("can't get tracing/events/header_page");
113 return -ENOMEM;
114 }
115
116 if (stat(path, &st) < 0) {
117 pr_debug("can't read '%s'", path);
118 goto out;
119 }
120
121 if (write(output_fd, "header_page", 12) != 12) {
122 pr_debug("can't write header_page\n");
123 goto out;
124 }
125
126 if (record_file(path, 8) < 0) {
127 pr_debug("can't record header_page file\n");
128 goto out;
129 }
130
131 put_tracing_file(path);
132
133 path = get_tracing_file("events/header_event");
134 if (!path) {
135 pr_debug("can't get tracing/events/header_event");
136 err = -ENOMEM;
137 goto out;
138 }
139
140 if (stat(path, &st) < 0) {
141 pr_debug("can't read '%s'", path);
142 goto out;
143 }
144
145 if (write(output_fd, "header_event", 13) != 13) {
146 pr_debug("can't write header_event\n");
147 goto out;
148 }
149
150 if (record_file(path, 8) < 0) {
151 pr_debug("can't record header_event file\n");
152 goto out;
153 }
154
155 err = 0;
156out:
157 put_tracing_file(path);
158 return err;
159}
160
161static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
162{
163 while (tps) {
164 if (!strcmp(sys, tps->name))
165 return true;
166 tps = tps->next;
167 }
168
169 return false;
170}
171
172#define for_each_event(dir, dent, tps) \
173 while ((dent = readdir(dir))) \
174 if (dent->d_type == DT_DIR && \
175 (strcmp(dent->d_name, ".")) && \
176 (strcmp(dent->d_name, ".."))) \
177
178static int copy_event_system(const char *sys, struct tracepoint_path *tps)
179{
180 struct dirent *dent;
181 struct stat st;
182 char *format;
183 DIR *dir;
184 int count = 0;
185 int ret;
186 int err;
187
188 dir = opendir(sys);
189 if (!dir) {
190 pr_debug("can't read directory '%s'", sys);
191 return -errno;
192 }
193
194 for_each_event(dir, dent, tps) {
195 if (!name_in_tp_list(dent->d_name, tps))
196 continue;
197
198 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
199 err = -ENOMEM;
200 goto out;
201 }
202 ret = stat(format, &st);
203 free(format);
204 if (ret < 0)
205 continue;
206 count++;
207 }
208
209 if (write(output_fd, &count, 4) != 4) {
210 err = -EIO;
211 pr_debug("can't write count\n");
212 goto out;
213 }
214
215 rewinddir(dir);
216 for_each_event(dir, dent, tps) {
217 if (!name_in_tp_list(dent->d_name, tps))
218 continue;
219
220 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
221 err = -ENOMEM;
222 goto out;
223 }
224 ret = stat(format, &st);
225
226 if (ret >= 0) {
227 err = record_file(format, 8);
228 if (err) {
229 free(format);
230 goto out;
231 }
232 }
233 free(format);
234 }
235 err = 0;
236out:
237 closedir(dir);
238 return err;
239}
240
241static int record_ftrace_files(struct tracepoint_path *tps)
242{
243 char *path;
244 int ret;
245
246 path = get_tracing_file("events/ftrace");
247 if (!path) {
248 pr_debug("can't get tracing/events/ftrace");
249 return -ENOMEM;
250 }
251
252 ret = copy_event_system(path, tps);
253
254 put_tracing_file(path);
255
256 return ret;
257}
258
259static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
260{
261 while (tps) {
262 if (!strcmp(sys, tps->system))
263 return true;
264 tps = tps->next;
265 }
266
267 return false;
268}
269
270static int record_event_files(struct tracepoint_path *tps)
271{
272 struct dirent *dent;
273 struct stat st;
274 char *path;
275 char *sys;
276 DIR *dir;
277 int count = 0;
278 int ret;
279 int err;
280
281 path = get_tracing_file("events");
282 if (!path) {
283 pr_debug("can't get tracing/events");
284 return -ENOMEM;
285 }
286
287 dir = opendir(path);
288 if (!dir) {
289 err = -errno;
290 pr_debug("can't read directory '%s'", path);
291 goto out;
292 }
293
294 for_each_event(dir, dent, tps) {
295 if (strcmp(dent->d_name, "ftrace") == 0 ||
296 !system_in_tp_list(dent->d_name, tps))
297 continue;
298
299 count++;
300 }
301
302 if (write(output_fd, &count, 4) != 4) {
303 err = -EIO;
304 pr_debug("can't write count\n");
305 goto out;
306 }
307
308 rewinddir(dir);
309 for_each_event(dir, dent, tps) {
310 if (strcmp(dent->d_name, "ftrace") == 0 ||
311 !system_in_tp_list(dent->d_name, tps))
312 continue;
313
314 if (asprintf(&sys, "%s/%s", path, dent->d_name) < 0) {
315 err = -ENOMEM;
316 goto out;
317 }
318 ret = stat(sys, &st);
319 if (ret >= 0) {
320 ssize_t size = strlen(dent->d_name) + 1;
321
322 if (write(output_fd, dent->d_name, size) != size ||
323 copy_event_system(sys, tps) < 0) {
324 err = -EIO;
325 free(sys);
326 goto out;
327 }
328 }
329 free(sys);
330 }
331 err = 0;
332out:
333 closedir(dir);
334 put_tracing_file(path);
335
336 return err;
337}
338
339static int record_proc_kallsyms(void)
340{
341 unsigned long long size = 0;
342 /*
343 * Just to keep older perf.data file parsers happy, record a zero
344 * sized kallsyms file, i.e. do the same thing that was done when
345 * /proc/kallsyms (or something specified via --kallsyms, in a
346 * different path) couldn't be read.
347 */
348 return write(output_fd, &size, 4) != 4 ? -EIO : 0;
349}
350
351static int record_ftrace_printk(void)
352{
353 unsigned int size;
354 char *path;
355 struct stat st;
356 int ret, err = 0;
357
358 path = get_tracing_file("printk_formats");
359 if (!path) {
360 pr_debug("can't get tracing/printk_formats");
361 return -ENOMEM;
362 }
363
364 ret = stat(path, &st);
365 if (ret < 0) {
366 /* not found */
367 size = 0;
368 if (write(output_fd, &size, 4) != 4)
369 err = -EIO;
370 goto out;
371 }
372 err = record_file(path, 4);
373
374out:
375 put_tracing_file(path);
376 return err;
377}
378
379static int record_saved_cmdline(void)
380{
381 unsigned int size;
382 char *path;
383 struct stat st;
384 int ret, err = 0;
385
386 path = get_tracing_file("saved_cmdlines");
387 if (!path) {
388 pr_debug("can't get tracing/saved_cmdline");
389 return -ENOMEM;
390 }
391
392 ret = stat(path, &st);
393 if (ret < 0) {
394 /* not found */
395 size = 0;
396 if (write(output_fd, &size, 8) != 8)
397 err = -EIO;
398 goto out;
399 }
400 err = record_file(path, 8);
401
402out:
403 put_tracing_file(path);
404 return err;
405}
406
407static void
408put_tracepoints_path(struct tracepoint_path *tps)
409{
410 while (tps) {
411 struct tracepoint_path *t = tps;
412
413 tps = tps->next;
414 zfree(&t->name);
415 zfree(&t->system);
416 free(t);
417 }
418}
419
420static struct tracepoint_path *
421get_tracepoints_path(struct list_head *pattrs)
422{
423 struct tracepoint_path path, *ppath = &path;
424 struct perf_evsel *pos;
425 int nr_tracepoints = 0;
426
427 list_for_each_entry(pos, pattrs, node) {
428 if (pos->attr.type != PERF_TYPE_TRACEPOINT)
429 continue;
430 ++nr_tracepoints;
431
432 if (pos->name) {
433 ppath->next = tracepoint_name_to_path(pos->name);
434 if (ppath->next)
435 goto next;
436
437 if (strchr(pos->name, ':') == NULL)
438 goto try_id;
439
440 goto error;
441 }
442
443try_id:
444 ppath->next = tracepoint_id_to_path(pos->attr.config);
445 if (!ppath->next) {
446error:
447 pr_debug("No memory to alloc tracepoints list\n");
448 put_tracepoints_path(&path);
449 return NULL;
450 }
451next:
452 ppath = ppath->next;
453 }
454
455 return nr_tracepoints > 0 ? path.next : NULL;
456}
457
458bool have_tracepoints(struct list_head *pattrs)
459{
460 struct perf_evsel *pos;
461
462 list_for_each_entry(pos, pattrs, node)
463 if (pos->attr.type == PERF_TYPE_TRACEPOINT)
464 return true;
465
466 return false;
467}
468
469static int tracing_data_header(void)
470{
471 char buf[20];
472 ssize_t size;
473
474 /* just guessing this is someone's birthday.. ;) */
475 buf[0] = 23;
476 buf[1] = 8;
477 buf[2] = 68;
478 memcpy(buf + 3, "tracing", 7);
479
480 if (write(output_fd, buf, 10) != 10)
481 return -1;
482
483 size = strlen(VERSION) + 1;
484 if (write(output_fd, VERSION, size) != size)
485 return -1;
486
487 /* save endian */
488 if (bigendian())
489 buf[0] = 1;
490 else
491 buf[0] = 0;
492
493 if (write(output_fd, buf, 1) != 1)
494 return -1;
495
496 /* save size of long */
497 buf[0] = sizeof(long);
498 if (write(output_fd, buf, 1) != 1)
499 return -1;
500
501 /* save page_size */
502 if (write(output_fd, &page_size, 4) != 4)
503 return -1;
504
505 return 0;
506}
507
508struct tracing_data *tracing_data_get(struct list_head *pattrs,
509 int fd, bool temp)
510{
511 struct tracepoint_path *tps;
512 struct tracing_data *tdata;
513 int err;
514
515 output_fd = fd;
516
517 tps = get_tracepoints_path(pattrs);
518 if (!tps)
519 return NULL;
520
521 tdata = malloc(sizeof(*tdata));
522 if (!tdata)
523 return NULL;
524
525 tdata->temp = temp;
526 tdata->size = 0;
527
528 if (temp) {
529 int temp_fd;
530
531 snprintf(tdata->temp_file, sizeof(tdata->temp_file),
532 "/tmp/perf-XXXXXX");
533 if (!mkstemp(tdata->temp_file)) {
534 pr_debug("Can't make temp file");
535 return NULL;
536 }
537
538 temp_fd = open(tdata->temp_file, O_RDWR);
539 if (temp_fd < 0) {
540 pr_debug("Can't read '%s'", tdata->temp_file);
541 return NULL;
542 }
543
544 /*
545 * Set the temp file the default output, so all the
546 * tracing data are stored into it.
547 */
548 output_fd = temp_fd;
549 }
550
551 err = tracing_data_header();
552 if (err)
553 goto out;
554 err = record_header_files();
555 if (err)
556 goto out;
557 err = record_ftrace_files(tps);
558 if (err)
559 goto out;
560 err = record_event_files(tps);
561 if (err)
562 goto out;
563 err = record_proc_kallsyms();
564 if (err)
565 goto out;
566 err = record_ftrace_printk();
567 if (err)
568 goto out;
569 err = record_saved_cmdline();
570
571out:
572 /*
573 * All tracing data are stored by now, we can restore
574 * the default output file in case we used temp file.
575 */
576 if (temp) {
577 tdata->size = lseek(output_fd, 0, SEEK_CUR);
578 close(output_fd);
579 output_fd = fd;
580 }
581
582 if (err)
583 zfree(&tdata);
584
585 put_tracepoints_path(tps);
586 return tdata;
587}
588
589int tracing_data_put(struct tracing_data *tdata)
590{
591 int err = 0;
592
593 if (tdata->temp) {
594 err = record_file(tdata->temp_file, 0);
595 unlink(tdata->temp_file);
596 }
597
598 free(tdata);
599 return err;
600}
601
602int read_tracing_data(int fd, struct list_head *pattrs)
603{
604 int err;
605 struct tracing_data *tdata;
606
607 /*
608 * We work over the real file, so we can write data
609 * directly, no temp file is needed.
610 */
611 tdata = tracing_data_get(pattrs, fd, false);
612 if (!tdata)
613 return -ENOMEM;
614
615 err = tracing_data_put(tdata);
616 return err;
617}
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 */
21#include "util.h"
22#include <dirent.h>
23#include <mntent.h>
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>
34#include <errno.h>
35#include <stdbool.h>
36#include <linux/list.h>
37#include <linux/kernel.h>
38
39#include "../perf.h"
40#include "trace-event.h"
41#include <api/fs/debugfs.h>
42#include "evsel.h"
43
44#define VERSION "0.5"
45
46static int output_fd;
47
48
49int bigendian(void)
50{
51 unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
52 unsigned int *ptr;
53
54 ptr = (unsigned int *)(void *)str;
55 return *ptr == 0x01020304;
56}
57
58/* unfortunately, you can not stat debugfs or proc files for size */
59static int record_file(const char *file, ssize_t hdr_sz)
60{
61 unsigned long long size = 0;
62 char buf[BUFSIZ], *sizep;
63 off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
64 int r, fd;
65 int err = -EIO;
66
67 fd = open(file, O_RDONLY);
68 if (fd < 0) {
69 pr_debug("Can't read '%s'", file);
70 return -errno;
71 }
72
73 /* put in zeros for file size, then fill true size later */
74 if (hdr_sz) {
75 if (write(output_fd, &size, hdr_sz) != hdr_sz)
76 goto out;
77 }
78
79 do {
80 r = read(fd, buf, BUFSIZ);
81 if (r > 0) {
82 size += r;
83 if (write(output_fd, buf, r) != r)
84 goto out;
85 }
86 } while (r > 0);
87
88 /* ugh, handle big-endian hdr_size == 4 */
89 sizep = (char*)&size;
90 if (bigendian())
91 sizep += sizeof(u64) - hdr_sz;
92
93 if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0) {
94 pr_debug("writing file size failed\n");
95 goto out;
96 }
97
98 err = 0;
99out:
100 close(fd);
101 return err;
102}
103
104static int record_header_files(void)
105{
106 char *path;
107 struct stat st;
108 int err = -EIO;
109
110 path = get_tracing_file("events/header_page");
111 if (!path) {
112 pr_debug("can't get tracing/events/header_page");
113 return -ENOMEM;
114 }
115
116 if (stat(path, &st) < 0) {
117 pr_debug("can't read '%s'", path);
118 goto out;
119 }
120
121 if (write(output_fd, "header_page", 12) != 12) {
122 pr_debug("can't write header_page\n");
123 goto out;
124 }
125
126 if (record_file(path, 8) < 0) {
127 pr_debug("can't record header_page file\n");
128 goto out;
129 }
130
131 put_tracing_file(path);
132
133 path = get_tracing_file("events/header_event");
134 if (!path) {
135 pr_debug("can't get tracing/events/header_event");
136 err = -ENOMEM;
137 goto out;
138 }
139
140 if (stat(path, &st) < 0) {
141 pr_debug("can't read '%s'", path);
142 goto out;
143 }
144
145 if (write(output_fd, "header_event", 13) != 13) {
146 pr_debug("can't write header_event\n");
147 goto out;
148 }
149
150 if (record_file(path, 8) < 0) {
151 pr_debug("can't record header_event file\n");
152 goto out;
153 }
154
155 err = 0;
156out:
157 put_tracing_file(path);
158 return err;
159}
160
161static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
162{
163 while (tps) {
164 if (!strcmp(sys, tps->name))
165 return true;
166 tps = tps->next;
167 }
168
169 return false;
170}
171
172static int copy_event_system(const char *sys, struct tracepoint_path *tps)
173{
174 struct dirent *dent;
175 struct stat st;
176 char *format;
177 DIR *dir;
178 int count = 0;
179 int ret;
180 int err;
181
182 dir = opendir(sys);
183 if (!dir) {
184 pr_debug("can't read directory '%s'", sys);
185 return -errno;
186 }
187
188 while ((dent = readdir(dir))) {
189 if (dent->d_type != DT_DIR ||
190 strcmp(dent->d_name, ".") == 0 ||
191 strcmp(dent->d_name, "..") == 0 ||
192 !name_in_tp_list(dent->d_name, tps))
193 continue;
194 format = malloc(strlen(sys) + strlen(dent->d_name) + 10);
195 if (!format) {
196 err = -ENOMEM;
197 goto out;
198 }
199 sprintf(format, "%s/%s/format", sys, dent->d_name);
200 ret = stat(format, &st);
201 free(format);
202 if (ret < 0)
203 continue;
204 count++;
205 }
206
207 if (write(output_fd, &count, 4) != 4) {
208 err = -EIO;
209 pr_debug("can't write count\n");
210 goto out;
211 }
212
213 rewinddir(dir);
214 while ((dent = readdir(dir))) {
215 if (dent->d_type != DT_DIR ||
216 strcmp(dent->d_name, ".") == 0 ||
217 strcmp(dent->d_name, "..") == 0 ||
218 !name_in_tp_list(dent->d_name, tps))
219 continue;
220 format = malloc(strlen(sys) + strlen(dent->d_name) + 10);
221 if (!format) {
222 err = -ENOMEM;
223 goto out;
224 }
225 sprintf(format, "%s/%s/format", sys, dent->d_name);
226 ret = stat(format, &st);
227
228 if (ret >= 0) {
229 err = record_file(format, 8);
230 if (err) {
231 free(format);
232 goto out;
233 }
234 }
235 free(format);
236 }
237 err = 0;
238out:
239 closedir(dir);
240 return err;
241}
242
243static int record_ftrace_files(struct tracepoint_path *tps)
244{
245 char *path;
246 int ret;
247
248 path = get_tracing_file("events/ftrace");
249 if (!path) {
250 pr_debug("can't get tracing/events/ftrace");
251 return -ENOMEM;
252 }
253
254 ret = copy_event_system(path, tps);
255
256 put_tracing_file(path);
257
258 return ret;
259}
260
261static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
262{
263 while (tps) {
264 if (!strcmp(sys, tps->system))
265 return true;
266 tps = tps->next;
267 }
268
269 return false;
270}
271
272static int record_event_files(struct tracepoint_path *tps)
273{
274 struct dirent *dent;
275 struct stat st;
276 char *path;
277 char *sys;
278 DIR *dir;
279 int count = 0;
280 int ret;
281 int err;
282
283 path = get_tracing_file("events");
284 if (!path) {
285 pr_debug("can't get tracing/events");
286 return -ENOMEM;
287 }
288
289 dir = opendir(path);
290 if (!dir) {
291 err = -errno;
292 pr_debug("can't read directory '%s'", path);
293 goto out;
294 }
295
296 while ((dent = readdir(dir))) {
297 if (dent->d_type != DT_DIR ||
298 strcmp(dent->d_name, ".") == 0 ||
299 strcmp(dent->d_name, "..") == 0 ||
300 strcmp(dent->d_name, "ftrace") == 0 ||
301 !system_in_tp_list(dent->d_name, tps))
302 continue;
303 count++;
304 }
305
306 if (write(output_fd, &count, 4) != 4) {
307 err = -EIO;
308 pr_debug("can't write count\n");
309 goto out;
310 }
311
312 rewinddir(dir);
313 while ((dent = readdir(dir))) {
314 if (dent->d_type != DT_DIR ||
315 strcmp(dent->d_name, ".") == 0 ||
316 strcmp(dent->d_name, "..") == 0 ||
317 strcmp(dent->d_name, "ftrace") == 0 ||
318 !system_in_tp_list(dent->d_name, tps))
319 continue;
320 sys = malloc(strlen(path) + strlen(dent->d_name) + 2);
321 if (!sys) {
322 err = -ENOMEM;
323 goto out;
324 }
325 sprintf(sys, "%s/%s", path, dent->d_name);
326 ret = stat(sys, &st);
327 if (ret >= 0) {
328 ssize_t size = strlen(dent->d_name) + 1;
329
330 if (write(output_fd, dent->d_name, size) != size ||
331 copy_event_system(sys, tps) < 0) {
332 err = -EIO;
333 free(sys);
334 goto out;
335 }
336 }
337 free(sys);
338 }
339 err = 0;
340out:
341 closedir(dir);
342 put_tracing_file(path);
343
344 return err;
345}
346
347static int record_proc_kallsyms(void)
348{
349 unsigned int size;
350 const char *path = "/proc/kallsyms";
351 struct stat st;
352 int ret, err = 0;
353
354 ret = stat(path, &st);
355 if (ret < 0) {
356 /* not found */
357 size = 0;
358 if (write(output_fd, &size, 4) != 4)
359 err = -EIO;
360 return err;
361 }
362 return record_file(path, 4);
363}
364
365static int record_ftrace_printk(void)
366{
367 unsigned int size;
368 char *path;
369 struct stat st;
370 int ret, err = 0;
371
372 path = get_tracing_file("printk_formats");
373 if (!path) {
374 pr_debug("can't get tracing/printk_formats");
375 return -ENOMEM;
376 }
377
378 ret = stat(path, &st);
379 if (ret < 0) {
380 /* not found */
381 size = 0;
382 if (write(output_fd, &size, 4) != 4)
383 err = -EIO;
384 goto out;
385 }
386 err = record_file(path, 4);
387
388out:
389 put_tracing_file(path);
390 return err;
391}
392
393static void
394put_tracepoints_path(struct tracepoint_path *tps)
395{
396 while (tps) {
397 struct tracepoint_path *t = tps;
398
399 tps = tps->next;
400 zfree(&t->name);
401 zfree(&t->system);
402 free(t);
403 }
404}
405
406static struct tracepoint_path *
407get_tracepoints_path(struct list_head *pattrs)
408{
409 struct tracepoint_path path, *ppath = &path;
410 struct perf_evsel *pos;
411 int nr_tracepoints = 0;
412
413 list_for_each_entry(pos, pattrs, node) {
414 if (pos->attr.type != PERF_TYPE_TRACEPOINT)
415 continue;
416 ++nr_tracepoints;
417
418 if (pos->name) {
419 ppath->next = tracepoint_name_to_path(pos->name);
420 if (ppath->next)
421 goto next;
422
423 if (strchr(pos->name, ':') == NULL)
424 goto try_id;
425
426 goto error;
427 }
428
429try_id:
430 ppath->next = tracepoint_id_to_path(pos->attr.config);
431 if (!ppath->next) {
432error:
433 pr_debug("No memory to alloc tracepoints list\n");
434 put_tracepoints_path(&path);
435 return NULL;
436 }
437next:
438 ppath = ppath->next;
439 }
440
441 return nr_tracepoints > 0 ? path.next : NULL;
442}
443
444bool have_tracepoints(struct list_head *pattrs)
445{
446 struct perf_evsel *pos;
447
448 list_for_each_entry(pos, pattrs, node)
449 if (pos->attr.type == PERF_TYPE_TRACEPOINT)
450 return true;
451
452 return false;
453}
454
455static int tracing_data_header(void)
456{
457 char buf[20];
458 ssize_t size;
459
460 /* just guessing this is someone's birthday.. ;) */
461 buf[0] = 23;
462 buf[1] = 8;
463 buf[2] = 68;
464 memcpy(buf + 3, "tracing", 7);
465
466 if (write(output_fd, buf, 10) != 10)
467 return -1;
468
469 size = strlen(VERSION) + 1;
470 if (write(output_fd, VERSION, size) != size)
471 return -1;
472
473 /* save endian */
474 if (bigendian())
475 buf[0] = 1;
476 else
477 buf[0] = 0;
478
479 if (write(output_fd, buf, 1) != 1)
480 return -1;
481
482 /* save size of long */
483 buf[0] = sizeof(long);
484 if (write(output_fd, buf, 1) != 1)
485 return -1;
486
487 /* save page_size */
488 if (write(output_fd, &page_size, 4) != 4)
489 return -1;
490
491 return 0;
492}
493
494struct tracing_data *tracing_data_get(struct list_head *pattrs,
495 int fd, bool temp)
496{
497 struct tracepoint_path *tps;
498 struct tracing_data *tdata;
499 int err;
500
501 output_fd = fd;
502
503 tps = get_tracepoints_path(pattrs);
504 if (!tps)
505 return NULL;
506
507 tdata = malloc(sizeof(*tdata));
508 if (!tdata)
509 return NULL;
510
511 tdata->temp = temp;
512 tdata->size = 0;
513
514 if (temp) {
515 int temp_fd;
516
517 snprintf(tdata->temp_file, sizeof(tdata->temp_file),
518 "/tmp/perf-XXXXXX");
519 if (!mkstemp(tdata->temp_file)) {
520 pr_debug("Can't make temp file");
521 return NULL;
522 }
523
524 temp_fd = open(tdata->temp_file, O_RDWR);
525 if (temp_fd < 0) {
526 pr_debug("Can't read '%s'", tdata->temp_file);
527 return NULL;
528 }
529
530 /*
531 * Set the temp file the default output, so all the
532 * tracing data are stored into it.
533 */
534 output_fd = temp_fd;
535 }
536
537 err = tracing_data_header();
538 if (err)
539 goto out;
540 err = record_header_files();
541 if (err)
542 goto out;
543 err = record_ftrace_files(tps);
544 if (err)
545 goto out;
546 err = record_event_files(tps);
547 if (err)
548 goto out;
549 err = record_proc_kallsyms();
550 if (err)
551 goto out;
552 err = record_ftrace_printk();
553
554out:
555 /*
556 * All tracing data are stored by now, we can restore
557 * the default output file in case we used temp file.
558 */
559 if (temp) {
560 tdata->size = lseek(output_fd, 0, SEEK_CUR);
561 close(output_fd);
562 output_fd = fd;
563 }
564
565 if (err)
566 zfree(&tdata);
567
568 put_tracepoints_path(tps);
569 return tdata;
570}
571
572int tracing_data_put(struct tracing_data *tdata)
573{
574 int err = 0;
575
576 if (tdata->temp) {
577 err = record_file(tdata->temp_file, 0);
578 unlink(tdata->temp_file);
579 }
580
581 free(tdata);
582 return err;
583}
584
585int read_tracing_data(int fd, struct list_head *pattrs)
586{
587 int err;
588 struct tracing_data *tdata;
589
590 /*
591 * We work over the real file, so we can write data
592 * directly, no temp file is needed.
593 */
594 tdata = tracing_data_get(pattrs, fd, false);
595 if (!tdata)
596 return -ENOMEM;
597
598 err = tracing_data_put(tdata);
599 return err;
600}