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 <api/fs/tracing_path.h>
52 unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
55 ptr = (unsigned int *)(void *)str;
56 return *ptr == 0x01020304;
59 /* unfortunately, you can not stat debugfs or proc files for size */
60 static int record_file(const char *file, ssize_t hdr_sz)
62 unsigned long long size = 0;
63 char buf[BUFSIZ], *sizep;
64 off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
68 fd = open(file, O_RDONLY);
70 pr_debug("Can't read '%s'", file);
74 /* put in zeros for file size, then fill true size later */
76 if (write(output_fd, &size, hdr_sz) != hdr_sz)
81 r = read(fd, buf, BUFSIZ);
84 if (write(output_fd, buf, r) != r)
89 /* ugh, handle big-endian hdr_size == 4 */
92 sizep += sizeof(u64) - hdr_sz;
94 if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0) {
95 pr_debug("writing file size failed\n");
105 static int record_header_files(void)
111 path = get_tracing_file("events/header_page");
113 pr_debug("can't get tracing/events/header_page");
117 if (stat(path, &st) < 0) {
118 pr_debug("can't read '%s'", path);
122 if (write(output_fd, "header_page", 12) != 12) {
123 pr_debug("can't write header_page\n");
127 if (record_file(path, 8) < 0) {
128 pr_debug("can't record header_page file\n");
132 put_tracing_file(path);
134 path = get_tracing_file("events/header_event");
136 pr_debug("can't get tracing/events/header_event");
141 if (stat(path, &st) < 0) {
142 pr_debug("can't read '%s'", path);
146 if (write(output_fd, "header_event", 13) != 13) {
147 pr_debug("can't write header_event\n");
151 if (record_file(path, 8) < 0) {
152 pr_debug("can't record header_event file\n");
158 put_tracing_file(path);
162 static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
165 if (!strcmp(sys, tps->name))
173 static int copy_event_system(const char *sys, struct tracepoint_path *tps)
185 pr_debug("can't read directory '%s'", sys);
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))
195 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
199 ret = stat(format, &st);
206 if (write(output_fd, &count, 4) != 4) {
208 pr_debug("can't write count\n");
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))
219 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
223 ret = stat(format, &st);
226 err = record_file(format, 8);
240 static int record_ftrace_files(struct tracepoint_path *tps)
245 path = get_tracing_file("events/ftrace");
247 pr_debug("can't get tracing/events/ftrace");
251 ret = copy_event_system(path, tps);
253 put_tracing_file(path);
258 static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
261 if (!strcmp(sys, tps->system))
269 static int record_event_files(struct tracepoint_path *tps)
280 path = get_tracing_file("events");
282 pr_debug("can't get tracing/events");
289 pr_debug("can't read directory '%s'", path);
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))
303 if (write(output_fd, &count, 4) != 4) {
305 pr_debug("can't write count\n");
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))
317 if (asprintf(&sys, "%s/%s", path, dent->d_name) < 0) {
321 ret = stat(sys, &st);
323 ssize_t size = strlen(dent->d_name) + 1;
325 if (write(output_fd, dent->d_name, size) != size ||
326 copy_event_system(sys, tps) < 0) {
337 put_tracing_file(path);
342 static int record_proc_kallsyms(void)
344 unsigned long long size = 0;
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.
351 return write(output_fd, &size, 4) != 4 ? -EIO : 0;
354 static int record_ftrace_printk(void)
361 path = get_tracing_file("printk_formats");
363 pr_debug("can't get tracing/printk_formats");
367 ret = stat(path, &st);
371 if (write(output_fd, &size, 4) != 4)
375 err = record_file(path, 4);
378 put_tracing_file(path);
383 put_tracepoints_path(struct tracepoint_path *tps)
386 struct tracepoint_path *t = tps;
395 static struct tracepoint_path *
396 get_tracepoints_path(struct list_head *pattrs)
398 struct tracepoint_path path, *ppath = &path;
399 struct perf_evsel *pos;
400 int nr_tracepoints = 0;
402 list_for_each_entry(pos, pattrs, node) {
403 if (pos->attr.type != PERF_TYPE_TRACEPOINT)
408 ppath->next = tracepoint_name_to_path(pos->name);
412 if (strchr(pos->name, ':') == NULL)
419 ppath->next = tracepoint_id_to_path(pos->attr.config);
422 pr_debug("No memory to alloc tracepoints list\n");
423 put_tracepoints_path(&path);
430 return nr_tracepoints > 0 ? path.next : NULL;
433 bool have_tracepoints(struct list_head *pattrs)
435 struct perf_evsel *pos;
437 list_for_each_entry(pos, pattrs, node)
438 if (pos->attr.type == PERF_TYPE_TRACEPOINT)
444 static int tracing_data_header(void)
449 /* just guessing this is someone's birthday.. ;) */
453 memcpy(buf + 3, "tracing", 7);
455 if (write(output_fd, buf, 10) != 10)
458 size = strlen(VERSION) + 1;
459 if (write(output_fd, VERSION, size) != size)
468 if (write(output_fd, buf, 1) != 1)
471 /* save size of long */
472 buf[0] = sizeof(long);
473 if (write(output_fd, buf, 1) != 1)
477 if (write(output_fd, &page_size, 4) != 4)
483 struct tracing_data *tracing_data_get(struct list_head *pattrs,
486 struct tracepoint_path *tps;
487 struct tracing_data *tdata;
492 tps = get_tracepoints_path(pattrs);
496 tdata = malloc(sizeof(*tdata));
506 snprintf(tdata->temp_file, sizeof(tdata->temp_file),
508 if (!mkstemp(tdata->temp_file)) {
509 pr_debug("Can't make temp file");
513 temp_fd = open(tdata->temp_file, O_RDWR);
515 pr_debug("Can't read '%s'", tdata->temp_file);
520 * Set the temp file the default output, so all the
521 * tracing data are stored into it.
526 err = tracing_data_header();
529 err = record_header_files();
532 err = record_ftrace_files(tps);
535 err = record_event_files(tps);
538 err = record_proc_kallsyms();
541 err = record_ftrace_printk();
545 * All tracing data are stored by now, we can restore
546 * the default output file in case we used temp file.
549 tdata->size = lseek(output_fd, 0, SEEK_CUR);
557 put_tracepoints_path(tps);
561 int tracing_data_put(struct tracing_data *tdata)
566 err = record_file(tdata->temp_file, 0);
567 unlink(tdata->temp_file);
574 int read_tracing_data(int fd, struct list_head *pattrs)
577 struct tracing_data *tdata;
580 * We work over the real file, so we can write data
581 * directly, no temp file is needed.
583 tdata = tracing_data_get(pattrs, fd, false);
587 err = tracing_data_put(tdata);