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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
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
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
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
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
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
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
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
483 buf[0] = sizeof(long);
484 if (write(output_fd, buf, 1) != 1)
485 return -1;
486
487
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
532
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
557
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
592
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}
601
