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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2008,2009, Steven Rostedt <srostedt@redhat.com>
4 */
5#include <dirent.h>
6#include <mntent.h>
7#include <stdio.h>
8#include <stdlib.h>
9#include <string.h>
10#include <stdarg.h>
11#include <sys/types.h>
12#include <sys/stat.h>
13#include <sys/wait.h>
14#include <fcntl.h>
15#include <unistd.h>
16#include <errno.h>
17#include <stdbool.h>
18#include <linux/list.h>
19#include <linux/kernel.h>
20#include <linux/zalloc.h>
21#include <internal/lib.h> // page_size
22
23#include "trace-event.h"
24#include <api/fs/tracing_path.h>
25#include "evsel.h"
26#include "debug.h"
27
28#define VERSION "0.6"
29
30static int output_fd;
31
32
33int bigendian(void)
34{
35 unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
36 unsigned int *ptr;
37
38 ptr = (unsigned int *)(void *)str;
39 return *ptr == 0x01020304;
40}
41
42/* unfortunately, you can not stat debugfs or proc files for size */
43static int record_file(const char *file, ssize_t hdr_sz)
44{
45 unsigned long long size = 0;
46 char buf[BUFSIZ], *sizep;
47 off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
48 int r, fd;
49 int err = -EIO;
50
51 fd = open(file, O_RDONLY);
52 if (fd < 0) {
53 pr_debug("Can't read '%s'", file);
54 return -errno;
55 }
56
57 /* put in zeros for file size, then fill true size later */
58 if (hdr_sz) {
59 if (write(output_fd, &size, hdr_sz) != hdr_sz)
60 goto out;
61 }
62
63 do {
64 r = read(fd, buf, BUFSIZ);
65 if (r > 0) {
66 size += r;
67 if (write(output_fd, buf, r) != r)
68 goto out;
69 }
70 } while (r > 0);
71
72 /* ugh, handle big-endian hdr_size == 4 */
73 sizep = (char*)&size;
74 if (bigendian())
75 sizep += sizeof(u64) - hdr_sz;
76
77 if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0) {
78 pr_debug("writing file size failed\n");
79 goto out;
80 }
81
82 err = 0;
83out:
84 close(fd);
85 return err;
86}
87
88static int record_header_files(void)
89{
90 char *path = get_events_file("header_page");
91 struct stat st;
92 int err = -EIO;
93
94 if (!path) {
95 pr_debug("can't get tracing/events/header_page");
96 return -ENOMEM;
97 }
98
99 if (stat(path, &st) < 0) {
100 pr_debug("can't read '%s'", path);
101 goto out;
102 }
103
104 if (write(output_fd, "header_page", 12) != 12) {
105 pr_debug("can't write header_page\n");
106 goto out;
107 }
108
109 if (record_file(path, 8) < 0) {
110 pr_debug("can't record header_page file\n");
111 goto out;
112 }
113
114 put_events_file(path);
115
116 path = get_events_file("header_event");
117 if (!path) {
118 pr_debug("can't get tracing/events/header_event");
119 err = -ENOMEM;
120 goto out;
121 }
122
123 if (stat(path, &st) < 0) {
124 pr_debug("can't read '%s'", path);
125 goto out;
126 }
127
128 if (write(output_fd, "header_event", 13) != 13) {
129 pr_debug("can't write header_event\n");
130 goto out;
131 }
132
133 if (record_file(path, 8) < 0) {
134 pr_debug("can't record header_event file\n");
135 goto out;
136 }
137
138 err = 0;
139out:
140 put_events_file(path);
141 return err;
142}
143
144static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
145{
146 while (tps) {
147 if (!strcmp(sys, tps->name))
148 return true;
149 tps = tps->next;
150 }
151
152 return false;
153}
154
155#define for_each_event(dir, dent, tps) \
156 while ((dent = readdir(dir))) \
157 if (dent->d_type == DT_DIR && \
158 (strcmp(dent->d_name, ".")) && \
159 (strcmp(dent->d_name, ".."))) \
160
161static int copy_event_system(const char *sys, struct tracepoint_path *tps)
162{
163 struct dirent *dent;
164 struct stat st;
165 char *format;
166 DIR *dir;
167 int count = 0;
168 int ret;
169 int err;
170
171 dir = opendir(sys);
172 if (!dir) {
173 pr_debug("can't read directory '%s'", sys);
174 return -errno;
175 }
176
177 for_each_event(dir, dent, tps) {
178 if (!name_in_tp_list(dent->d_name, tps))
179 continue;
180
181 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
182 err = -ENOMEM;
183 goto out;
184 }
185 ret = stat(format, &st);
186 free(format);
187 if (ret < 0)
188 continue;
189 count++;
190 }
191
192 if (write(output_fd, &count, 4) != 4) {
193 err = -EIO;
194 pr_debug("can't write count\n");
195 goto out;
196 }
197
198 rewinddir(dir);
199 for_each_event(dir, dent, tps) {
200 if (!name_in_tp_list(dent->d_name, tps))
201 continue;
202
203 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
204 err = -ENOMEM;
205 goto out;
206 }
207 ret = stat(format, &st);
208
209 if (ret >= 0) {
210 err = record_file(format, 8);
211 if (err) {
212 free(format);
213 goto out;
214 }
215 }
216 free(format);
217 }
218 err = 0;
219out:
220 closedir(dir);
221 return err;
222}
223
224static int record_ftrace_files(struct tracepoint_path *tps)
225{
226 char *path;
227 int ret;
228
229 path = get_events_file("ftrace");
230 if (!path) {
231 pr_debug("can't get tracing/events/ftrace");
232 return -ENOMEM;
233 }
234
235 ret = copy_event_system(path, tps);
236
237 put_tracing_file(path);
238
239 return ret;
240}
241
242static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
243{
244 while (tps) {
245 if (!strcmp(sys, tps->system))
246 return true;
247 tps = tps->next;
248 }
249
250 return false;
251}
252
253static int record_event_files(struct tracepoint_path *tps)
254{
255 struct dirent *dent;
256 struct stat st;
257 char *path;
258 char *sys;
259 DIR *dir;
260 int count = 0;
261 int ret;
262 int err;
263
264 path = get_tracing_file("events");
265 if (!path) {
266 pr_debug("can't get tracing/events");
267 return -ENOMEM;
268 }
269
270 dir = opendir(path);
271 if (!dir) {
272 err = -errno;
273 pr_debug("can't read directory '%s'", path);
274 goto out;
275 }
276
277 for_each_event(dir, dent, tps) {
278 if (strcmp(dent->d_name, "ftrace") == 0 ||
279 !system_in_tp_list(dent->d_name, tps))
280 continue;
281
282 count++;
283 }
284
285 if (write(output_fd, &count, 4) != 4) {
286 err = -EIO;
287 pr_debug("can't write count\n");
288 goto out;
289 }
290
291 rewinddir(dir);
292 for_each_event(dir, dent, tps) {
293 if (strcmp(dent->d_name, "ftrace") == 0 ||
294 !system_in_tp_list(dent->d_name, tps))
295 continue;
296
297 if (asprintf(&sys, "%s/%s", path, dent->d_name) < 0) {
298 err = -ENOMEM;
299 goto out;
300 }
301 ret = stat(sys, &st);
302 if (ret >= 0) {
303 ssize_t size = strlen(dent->d_name) + 1;
304
305 if (write(output_fd, dent->d_name, size) != size ||
306 copy_event_system(sys, tps) < 0) {
307 err = -EIO;
308 free(sys);
309 goto out;
310 }
311 }
312 free(sys);
313 }
314 err = 0;
315out:
316 closedir(dir);
317 put_tracing_file(path);
318
319 return err;
320}
321
322static int record_proc_kallsyms(void)
323{
324 unsigned long long size = 0;
325 /*
326 * Just to keep older perf.data file parsers happy, record a zero
327 * sized kallsyms file, i.e. do the same thing that was done when
328 * /proc/kallsyms (or something specified via --kallsyms, in a
329 * different path) couldn't be read.
330 */
331 return write(output_fd, &size, 4) != 4 ? -EIO : 0;
332}
333
334static int record_ftrace_printk(void)
335{
336 unsigned int size;
337 char *path;
338 struct stat st;
339 int ret, err = 0;
340
341 path = get_tracing_file("printk_formats");
342 if (!path) {
343 pr_debug("can't get tracing/printk_formats");
344 return -ENOMEM;
345 }
346
347 ret = stat(path, &st);
348 if (ret < 0) {
349 /* not found */
350 size = 0;
351 if (write(output_fd, &size, 4) != 4)
352 err = -EIO;
353 goto out;
354 }
355 err = record_file(path, 4);
356
357out:
358 put_tracing_file(path);
359 return err;
360}
361
362static int record_saved_cmdline(void)
363{
364 unsigned long long size;
365 char *path;
366 struct stat st;
367 int ret, err = 0;
368
369 path = get_tracing_file("saved_cmdlines");
370 if (!path) {
371 pr_debug("can't get tracing/saved_cmdline");
372 return -ENOMEM;
373 }
374
375 ret = stat(path, &st);
376 if (ret < 0) {
377 /* not found */
378 size = 0;
379 if (write(output_fd, &size, 8) != 8)
380 err = -EIO;
381 goto out;
382 }
383 err = record_file(path, 8);
384
385out:
386 put_tracing_file(path);
387 return err;
388}
389
390static void
391put_tracepoints_path(struct tracepoint_path *tps)
392{
393 while (tps) {
394 struct tracepoint_path *t = tps;
395
396 tps = tps->next;
397 zfree(&t->name);
398 zfree(&t->system);
399 free(t);
400 }
401}
402
403static struct tracepoint_path *
404get_tracepoints_path(struct list_head *pattrs)
405{
406 struct tracepoint_path path, *ppath = &path;
407 struct evsel *pos;
408 int nr_tracepoints = 0;
409
410 list_for_each_entry(pos, pattrs, core.node) {
411 if (pos->core.attr.type != PERF_TYPE_TRACEPOINT)
412 continue;
413 ++nr_tracepoints;
414
415 if (pos->name) {
416 ppath->next = tracepoint_name_to_path(pos->name);
417 if (ppath->next)
418 goto next;
419
420 if (strchr(pos->name, ':') == NULL)
421 goto try_id;
422
423 goto error;
424 }
425
426try_id:
427 ppath->next = tracepoint_id_to_path(pos->core.attr.config);
428 if (!ppath->next) {
429error:
430 pr_debug("No memory to alloc tracepoints list\n");
431 put_tracepoints_path(&path);
432 return NULL;
433 }
434next:
435 ppath = ppath->next;
436 }
437
438 return nr_tracepoints > 0 ? path.next : NULL;
439}
440
441bool have_tracepoints(struct list_head *pattrs)
442{
443 struct evsel *pos;
444
445 list_for_each_entry(pos, pattrs, core.node)
446 if (pos->core.attr.type == PERF_TYPE_TRACEPOINT)
447 return true;
448
449 return false;
450}
451
452static int tracing_data_header(void)
453{
454 char buf[20];
455 ssize_t size;
456
457 /* just guessing this is someone's birthday.. ;) */
458 buf[0] = 23;
459 buf[1] = 8;
460 buf[2] = 68;
461 memcpy(buf + 3, "tracing", 7);
462
463 if (write(output_fd, buf, 10) != 10)
464 return -1;
465
466 size = strlen(VERSION) + 1;
467 if (write(output_fd, VERSION, size) != size)
468 return -1;
469
470 /* save endian */
471 if (bigendian())
472 buf[0] = 1;
473 else
474 buf[0] = 0;
475
476 if (write(output_fd, buf, 1) != 1)
477 return -1;
478
479 /* save size of long */
480 buf[0] = sizeof(long);
481 if (write(output_fd, buf, 1) != 1)
482 return -1;
483
484 /* save page_size */
485 if (write(output_fd, &page_size, 4) != 4)
486 return -1;
487
488 return 0;
489}
490
491struct tracing_data *tracing_data_get(struct list_head *pattrs,
492 int fd, bool temp)
493{
494 struct tracepoint_path *tps;
495 struct tracing_data *tdata;
496 int err;
497
498 output_fd = fd;
499
500 tps = get_tracepoints_path(pattrs);
501 if (!tps)
502 return NULL;
503
504 tdata = malloc(sizeof(*tdata));
505 if (!tdata)
506 return NULL;
507
508 tdata->temp = temp;
509 tdata->size = 0;
510
511 if (temp) {
512 int temp_fd;
513
514 snprintf(tdata->temp_file, sizeof(tdata->temp_file),
515 "/tmp/perf-XXXXXX");
516 if (!mkstemp(tdata->temp_file)) {
517 pr_debug("Can't make temp file");
518 free(tdata);
519 return NULL;
520 }
521
522 temp_fd = open(tdata->temp_file, O_RDWR);
523 if (temp_fd < 0) {
524 pr_debug("Can't read '%s'", tdata->temp_file);
525 free(tdata);
526 return NULL;
527 }
528
529 /*
530 * Set the temp file the default output, so all the
531 * tracing data are stored into it.
532 */
533 output_fd = temp_fd;
534 }
535
536 err = tracing_data_header();
537 if (err)
538 goto out;
539 err = record_header_files();
540 if (err)
541 goto out;
542 err = record_ftrace_files(tps);
543 if (err)
544 goto out;
545 err = record_event_files(tps);
546 if (err)
547 goto out;
548 err = record_proc_kallsyms();
549 if (err)
550 goto out;
551 err = record_ftrace_printk();
552 if (err)
553 goto out;
554 err = record_saved_cmdline();
555
556out:
557 /*
558 * All tracing data are stored by now, we can restore
559 * the default output file in case we used temp file.
560 */
561 if (temp) {
562 tdata->size = lseek(output_fd, 0, SEEK_CUR);
563 close(output_fd);
564 output_fd = fd;
565 }
566
567 if (err)
568 zfree(&tdata);
569
570 put_tracepoints_path(tps);
571 return tdata;
572}
573
574int tracing_data_put(struct tracing_data *tdata)
575{
576 int err = 0;
577
578 if (tdata->temp) {
579 err = record_file(tdata->temp_file, 0);
580 unlink(tdata->temp_file);
581 }
582
583 free(tdata);
584 return err;
585}
586
587int read_tracing_data(int fd, struct list_head *pattrs)
588{
589 int err;
590 struct tracing_data *tdata;
591
592 /*
593 * We work over the real file, so we can write data
594 * directly, no temp file is needed.
595 */
596 tdata = tracing_data_get(pattrs, fd, false);
597 if (!tdata)
598 return -ENOMEM;
599
600 err = tracing_data_put(tdata);
601 return err;
602}
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}