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