2 * Copyright (C) 2008,2009, Steven Rostedt <srostedt@redhat.com>
4 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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!)
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.
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
19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
28 #include <sys/types.h>
36 #include <linux/list.h>
37 #include <linux/kernel.h>
40 #include "trace-event.h"
41 #include <lk/debugfs.h>
51 unsigned char str
[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
54 ptr
= (unsigned int *)(void *)str
;
55 return *ptr
== 0x01020304;
58 /* unfortunately, you can not stat debugfs or proc files for size */
59 static int record_file(const char *file
, ssize_t hdr_sz
)
61 unsigned long long size
= 0;
62 char buf
[BUFSIZ
], *sizep
;
63 off_t hdr_pos
= lseek(output_fd
, 0, SEEK_CUR
);
67 fd
= open(file
, O_RDONLY
);
69 pr_debug("Can't read '%s'", file
);
73 /* put in zeros for file size, then fill true size later */
75 if (write(output_fd
, &size
, hdr_sz
) != hdr_sz
)
80 r
= read(fd
, buf
, BUFSIZ
);
83 if (write(output_fd
, buf
, r
) != r
)
88 /* ugh, handle big-endian hdr_size == 4 */
91 sizep
+= sizeof(u64
) - hdr_sz
;
93 if (hdr_sz
&& pwrite(output_fd
, sizep
, hdr_sz
, hdr_pos
) < 0) {
94 pr_debug("writing file size failed\n");
104 static int record_header_files(void)
110 path
= get_tracing_file("events/header_page");
112 pr_debug("can't get tracing/events/header_page");
116 if (stat(path
, &st
) < 0) {
117 pr_debug("can't read '%s'", path
);
121 if (write(output_fd
, "header_page", 12) != 12) {
122 pr_debug("can't write header_page\n");
126 if (record_file(path
, 8) < 0) {
127 pr_debug("can't record header_page file\n");
131 put_tracing_file(path
);
133 path
= get_tracing_file("events/header_event");
135 pr_debug("can't get tracing/events/header_event");
140 if (stat(path
, &st
) < 0) {
141 pr_debug("can't read '%s'", path
);
145 if (write(output_fd
, "header_event", 13) != 13) {
146 pr_debug("can't write header_event\n");
150 if (record_file(path
, 8) < 0) {
151 pr_debug("can't record header_event file\n");
157 put_tracing_file(path
);
161 static bool name_in_tp_list(char *sys
, struct tracepoint_path
*tps
)
164 if (!strcmp(sys
, tps
->name
))
172 static int copy_event_system(const char *sys
, struct tracepoint_path
*tps
)
184 pr_debug("can't read directory '%s'", sys
);
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
))
194 format
= malloc(strlen(sys
) + strlen(dent
->d_name
) + 10);
199 sprintf(format
, "%s/%s/format", sys
, dent
->d_name
);
200 ret
= stat(format
, &st
);
207 if (write(output_fd
, &count
, 4) != 4) {
209 pr_debug("can't write count\n");
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
))
220 format
= malloc(strlen(sys
) + strlen(dent
->d_name
) + 10);
225 sprintf(format
, "%s/%s/format", sys
, dent
->d_name
);
226 ret
= stat(format
, &st
);
229 err
= record_file(format
, 8);
243 static int record_ftrace_files(struct tracepoint_path
*tps
)
248 path
= get_tracing_file("events/ftrace");
250 pr_debug("can't get tracing/events/ftrace");
254 ret
= copy_event_system(path
, tps
);
256 put_tracing_file(path
);
261 static bool system_in_tp_list(char *sys
, struct tracepoint_path
*tps
)
264 if (!strcmp(sys
, tps
->system
))
272 static int record_event_files(struct tracepoint_path
*tps
)
283 path
= get_tracing_file("events");
285 pr_debug("can't get tracing/events");
292 pr_debug("can't read directory '%s'", path
);
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
))
306 if (write(output_fd
, &count
, 4) != 4) {
308 pr_debug("can't write count\n");
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
))
320 sys
= malloc(strlen(path
) + strlen(dent
->d_name
) + 2);
325 sprintf(sys
, "%s/%s", path
, dent
->d_name
);
326 ret
= stat(sys
, &st
);
328 ssize_t size
= strlen(dent
->d_name
) + 1;
330 if (write(output_fd
, dent
->d_name
, size
) != size
||
331 copy_event_system(sys
, tps
) < 0) {
342 put_tracing_file(path
);
347 static int record_proc_kallsyms(void)
350 const char *path
= "/proc/kallsyms";
354 ret
= stat(path
, &st
);
358 if (write(output_fd
, &size
, 4) != 4)
362 return record_file(path
, 4);
365 static int record_ftrace_printk(void)
372 path
= get_tracing_file("printk_formats");
374 pr_debug("can't get tracing/printk_formats");
378 ret
= stat(path
, &st
);
382 if (write(output_fd
, &size
, 4) != 4)
386 err
= record_file(path
, 4);
389 put_tracing_file(path
);
394 put_tracepoints_path(struct tracepoint_path
*tps
)
397 struct tracepoint_path
*t
= tps
;
406 static struct tracepoint_path
*
407 get_tracepoints_path(struct list_head
*pattrs
)
409 struct tracepoint_path path
, *ppath
= &path
;
410 struct perf_evsel
*pos
;
411 int nr_tracepoints
= 0;
413 list_for_each_entry(pos
, pattrs
, node
) {
414 if (pos
->attr
.type
!= PERF_TYPE_TRACEPOINT
)
419 ppath
->next
= tracepoint_name_to_path(pos
->name
);
423 if (strchr(pos
->name
, ':') == NULL
)
430 ppath
->next
= tracepoint_id_to_path(pos
->attr
.config
);
433 pr_debug("No memory to alloc tracepoints list\n");
434 put_tracepoints_path(&path
);
441 return nr_tracepoints
> 0 ? path
.next
: NULL
;
444 bool have_tracepoints(struct list_head
*pattrs
)
446 struct perf_evsel
*pos
;
448 list_for_each_entry(pos
, pattrs
, node
)
449 if (pos
->attr
.type
== PERF_TYPE_TRACEPOINT
)
455 static int tracing_data_header(void)
460 /* just guessing this is someone's birthday.. ;) */
464 memcpy(buf
+ 3, "tracing", 7);
466 if (write(output_fd
, buf
, 10) != 10)
469 size
= strlen(VERSION
) + 1;
470 if (write(output_fd
, VERSION
, size
) != size
)
479 if (write(output_fd
, buf
, 1) != 1)
482 /* save size of long */
483 buf
[0] = sizeof(long);
484 if (write(output_fd
, buf
, 1) != 1)
488 if (write(output_fd
, &page_size
, 4) != 4)
494 struct tracing_data
*tracing_data_get(struct list_head
*pattrs
,
497 struct tracepoint_path
*tps
;
498 struct tracing_data
*tdata
;
503 tps
= get_tracepoints_path(pattrs
);
507 tdata
= malloc(sizeof(*tdata
));
517 snprintf(tdata
->temp_file
, sizeof(tdata
->temp_file
),
519 if (!mkstemp(tdata
->temp_file
)) {
520 pr_debug("Can't make temp file");
524 temp_fd
= open(tdata
->temp_file
, O_RDWR
);
526 pr_debug("Can't read '%s'", tdata
->temp_file
);
531 * Set the temp file the default output, so all the
532 * tracing data are stored into it.
537 err
= tracing_data_header();
540 err
= record_header_files();
543 err
= record_ftrace_files(tps
);
546 err
= record_event_files(tps
);
549 err
= record_proc_kallsyms();
552 err
= record_ftrace_printk();
556 * All tracing data are stored by now, we can restore
557 * the default output file in case we used temp file.
560 tdata
->size
= lseek(output_fd
, 0, SEEK_CUR
);
570 put_tracepoints_path(tps
);
574 int tracing_data_put(struct tracing_data
*tdata
)
579 err
= record_file(tdata
->temp_file
, 0);
580 unlink(tdata
->temp_file
);
587 int read_tracing_data(int fd
, struct list_head
*pattrs
)
590 struct tracing_data
*tdata
;
593 * We work over the real file, so we can write data
594 * directly, no temp file is needed.
596 tdata
= tracing_data_get(pattrs
, fd
, false);
600 err
= tracing_data_put(tdata
);