Release 4.10 tools/perf/util/trace-event-info.c

/*
 * Copyright (C) 2008,2009, Steven Rostedt <srostedt@redhat.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License (not later!)
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
#include "util.h"
#include <dirent.h>
#include <mntent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <pthread.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <stdbool.h>
#include <linux/list.h>
#include <linux/kernel.h>

#include "../perf.h"
#include "trace-event.h"
#include <api/fs/tracing_path.h>
#include "evsel.h"
#include "debug.h"


#define VERSION "0.5"


static int output_fd;




int bigendian(void)
{
	unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
	unsigned int *ptr;

	ptr = (unsigned int *)(void *)str;
	return *ptr == 0x01020304;
}

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steven rostedt
50
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1
50.00%
ingo molnar
ingo molnar
4
7.41%
1
50.00%
Total
54
100.00%
2
100.00%

/* unfortunately, you can not stat debugfs or proc files for size */


static int record_file(const char *file, ssize_t hdr_sz)
{
	unsigned long long size = 0;
	char buf[BUFSIZ], *sizep;
	off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
	int r, fd;
	int err = -EIO;

	fd = open(file, O_RDONLY);
	if (fd < 0) {
		pr_debug("Can't read '%s'", file);
		return -errno;
	}

	/* put in zeros for file size, then fill true size later */
	if (hdr_sz) {
		if (write(output_fd, &size, hdr_sz) != hdr_sz)
			goto out;
	}

	do {
		r = read(fd, buf, BUFSIZ);
		if (r > 0) {
			size += r;
			if (write(output_fd, buf, r) != r)
				goto out;
		}
	} while (r > 0);

	/* ugh, handle big-endian hdr_size == 4 */
	sizep = (char*)&size;
	if (bigendian())
		sizep += sizeof(u64) - hdr_sz;

	if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0) {
		pr_debug("writing file size failed\n");
		goto out;
	}

	err = 0;
out:
	close(fd);
	return err;
}

Contributors
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steven rostedt
steven rostedt
94
42.92%
1
20.00%
namhyung kim
namhyung kim
60
27.40%
2
40.00%
sonny rao
sonny rao
59
26.94%
1
20.00%
jiri olsa
jiri olsa
6
2.74%
1
20.00%
Total
219
100.00%
5
100.00%



static int record_header_files(void)
{
	char *path;
	struct stat st;
	int err = -EIO;

	path = get_tracing_file("events/header_page");
	if (!path) {
		pr_debug("can't get tracing/events/header_page");
		return -ENOMEM;
	}

	if (stat(path, &st) < 0) {
		pr_debug("can't read '%s'", path);
		goto out;
	}

	if (write(output_fd, "header_page", 12) != 12) {
		pr_debug("can't write header_page\n");
		goto out;
	}

	if (record_file(path, 8) < 0) {
		pr_debug("can't record header_page file\n");
		goto out;
	}

	put_tracing_file(path);

	path = get_tracing_file("events/header_event");
	if (!path) {
		pr_debug("can't get tracing/events/header_event");
		err = -ENOMEM;
		goto out;
	}

	if (stat(path, &st) < 0) {
		pr_debug("can't read '%s'", path);
		goto out;
	}

	if (write(output_fd, "header_event", 13) != 13) {
		pr_debug("can't write header_event\n");
		goto out;
	}

	if (record_file(path, 8) < 0) {
		pr_debug("can't record header_event file\n");
		goto out;
	}

	err = 0;
out:
	put_tracing_file(path);
	return err;
}

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namhyung kim
namhyung kim
127
55.95%
4
66.67%
steven rostedt
steven rostedt
83
36.56%
1
16.67%
sonny rao
sonny rao
17
7.49%
1
16.67%
Total
227
100.00%
6
100.00%



static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
{
	while (tps) {
		if (!strcmp(sys, tps->name))
			return true;
		tps = tps->next;
	}

	return false;
}

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frederic weisbecker
frederic weisbecker
45
100.00%
1
100.00%
Total
45
100.00%
1
100.00%



static int copy_event_system(const char *sys, struct tracepoint_path *tps)
{
	struct dirent *dent;
	struct stat st;
	char *format;
	DIR *dir;
	int count = 0;
	int ret;
	int err;

	dir = opendir(sys);
	if (!dir) {
		pr_debug("can't read directory '%s'", sys);
		return -errno;
	}

	while ((dent = readdir(dir))) {
		if (dent->d_type != DT_DIR ||
		    strcmp(dent->d_name, ".") == 0 ||
		    strcmp(dent->d_name, "..") == 0 ||
		    !name_in_tp_list(dent->d_name, tps))
			continue;
		if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
			err = -ENOMEM;
			goto out;
		}
		ret = stat(format, &st);
		free(format);
		if (ret < 0)
			continue;
		count++;
	}

	if (write(output_fd, &count, 4) != 4) {
		err = -EIO;
		pr_debug("can't write count\n");
		goto out;
	}

	rewinddir(dir);
	while ((dent = readdir(dir))) {
		if (dent->d_type != DT_DIR ||
		    strcmp(dent->d_name, ".") == 0 ||
		    strcmp(dent->d_name, "..") == 0 ||
		    !name_in_tp_list(dent->d_name, tps))
			continue;
		if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
			err = -ENOMEM;
			goto out;
		}
		ret = stat(format, &st);

		if (ret >= 0) {
			err = record_file(format, 8);
			if (err) {
				free(format);
				goto out;
			}
		}
		free(format);
	}
	err = 0;
out:
	closedir(dir);
	return err;
}

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steven rostedt
steven rostedt
205
58.24%
1
11.11%
namhyung kim
namhyung kim
82
23.30%
3
33.33%
frederic weisbecker
frederic weisbecker
25
7.10%
1
11.11%
andy shevchenko
andy shevchenko
22
6.25%
1
11.11%
ulrich drepper
ulrich drepper
12
3.41%
1
11.11%
xiao guangrong
xiao guangrong
5
1.42%
1
11.11%
sonny rao
sonny rao
1
0.28%
1
11.11%
Total
352
100.00%
9
100.00%



static int record_ftrace_files(struct tracepoint_path *tps)
{
	char *path;
	int ret;

	path = get_tracing_file("events/ftrace");
	if (!path) {
		pr_debug("can't get tracing/events/ftrace");
		return -ENOMEM;
	}

	ret = copy_event_system(path, tps);

	put_tracing_file(path);

	return ret;
}

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steven rostedt
steven rostedt
26
44.83%
1
16.67%
namhyung kim
namhyung kim
26
44.83%
4
66.67%
frederic weisbecker
frederic weisbecker
6
10.34%
1
16.67%
Total
58
100.00%
6
100.00%



static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
{
	while (tps) {
		if (!strcmp(sys, tps->system))
			return true;
		tps = tps->next;
	}

	return false;
}

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frederic weisbecker
frederic weisbecker
45
100.00%
1
100.00%
Total
45
100.00%
1
100.00%



static int record_event_files(struct tracepoint_path *tps)
{
	struct dirent *dent;
	struct stat st;
	char *path;
	char *sys;
	DIR *dir;
	int count = 0;
	int ret;
	int err;

	path = get_tracing_file("events");
	if (!path) {
		pr_debug("can't get tracing/events");
		return -ENOMEM;
	}

	dir = opendir(path);
	if (!dir) {
		err = -errno;
		pr_debug("can't read directory '%s'", path);
		goto out;
	}

	while ((dent = readdir(dir))) {
		if (dent->d_type != DT_DIR ||
		    strcmp(dent->d_name, ".") == 0 ||
		    strcmp(dent->d_name, "..") == 0 ||
		    strcmp(dent->d_name, "ftrace") == 0 ||
		    !system_in_tp_list(dent->d_name, tps))
			continue;
		count++;
	}

	if (write(output_fd, &count, 4) != 4) {
		err = -EIO;
		pr_debug("can't write count\n");
		goto out;
	}

	rewinddir(dir);
	while ((dent = readdir(dir))) {
		if (dent->d_type != DT_DIR ||
		    strcmp(dent->d_name, ".") == 0 ||
		    strcmp(dent->d_name, "..") == 0 ||
		    strcmp(dent->d_name, "ftrace") == 0 ||
		    !system_in_tp_list(dent->d_name, tps))
			continue;
		if (asprintf(&sys, "%s/%s", path, dent->d_name) < 0) {
			err = -ENOMEM;
			goto out;
		}
		ret = stat(sys, &st);
		if (ret >= 0) {
			ssize_t size = strlen(dent->d_name) + 1;

			if (write(output_fd, dent->d_name, size) != size ||
			    copy_event_system(sys, tps) < 0) {
				err = -EIO;
				free(sys);
				goto out;
			}
		}
		free(sys);
	}
	err = 0;
out:
	closedir(dir);
	put_tracing_file(path);

	return err;
}

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steven rostedt
steven rostedt
220
57.44%
1
10.00%
namhyung kim
namhyung kim
109
28.46%
5
50.00%
frederic weisbecker
frederic weisbecker
26
6.79%
1
10.00%
ulrich drepper
ulrich drepper
12
3.13%
1
10.00%
andy shevchenko
andy shevchenko
11
2.87%
1
10.00%
xiao guangrong
xiao guangrong
5
1.31%
1
10.00%
Total
383
100.00%
10
100.00%



static int record_proc_kallsyms(void)
{
	unsigned long long size = 0;
	/*
         * Just to keep older perf.data file parsers happy, record a zero
         * sized kallsyms file, i.e. do the same thing that was done when
         * /proc/kallsyms (or something specified via --kallsyms, in a
         * different path) couldn't be read.
         */
	return write(output_fd, &size, 4) != 4 ? -EIO : 0;
}

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steven rostedt
steven rostedt
15
44.12%
1
25.00%
namhyung kim
namhyung kim
12
35.29%
2
50.00%
arnaldo carvalho de melo
arnaldo carvalho de melo
7
20.59%
1
25.00%
Total
34
100.00%
4
100.00%



static int record_ftrace_printk(void)
{
	unsigned int size;
	char *path;
	struct stat st;
	int ret, err = 0;

	path = get_tracing_file("printk_formats");
	if (!path) {
		pr_debug("can't get tracing/printk_formats");
		return -ENOMEM;
	}

	ret = stat(path, &st);
	if (ret < 0) {
		/* not found */
		size = 0;
		if (write(output_fd, &size, 4) != 4)
			err = -EIO;
		goto out;
	}
	err = record_file(path, 4);

out:
	put_tracing_file(path);
	return err;
}

Contributors
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Tokens
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CommitProp
steven rostedt
steven rostedt
64
56.14%
1
14.29%
namhyung kim
namhyung kim
39
34.21%
4
57.14%
li zefan
li zefan
10
8.77%
1
14.29%
sonny rao
sonny rao
1
0.88%
1
14.29%
Total
114
100.00%
7
100.00%


static void

put_tracepoints_path(struct tracepoint_path *tps)
{
	while (tps) {
		struct tracepoint_path *t = tps;

		tps = tps->next;
		zfree(&t->name);
		zfree(&t->system);
		free(t);
	}
}

Contributors
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namhyung kim
namhyung kim
46
90.20%
1
33.33%
arnaldo carvalho de melo
arnaldo carvalho de melo
4
7.84%
1
33.33%
frederic weisbecker
frederic weisbecker
1
1.96%
1
33.33%
Total
51
100.00%
3
100.00%


static struct tracepoint_path *

get_tracepoints_path(struct list_head *pattrs)
{
	struct tracepoint_path path, *ppath = &path;
	struct perf_evsel *pos;
	int nr_tracepoints = 0;

	list_for_each_entry(pos, pattrs, node) {
		if (pos->attr.type != PERF_TYPE_TRACEPOINT)
			continue;
		++nr_tracepoints;

		if (pos->name) {
			ppath->next = tracepoint_name_to_path(pos->name);
			if (ppath->next)
				goto next;

			if (strchr(pos->name, ':') == NULL)
				goto try_id;

			goto error;
		}

try_id:
		ppath->next = tracepoint_id_to_path(pos->attr.config);
		if (!ppath->next) {
error:
			pr_debug("No memory to alloc tracepoints list\n");
			put_tracepoints_path(&path);
			return NULL;
		}
next:
		ppath = ppath->next;
	}

	return nr_tracepoints > 0 ? path.next : NULL;
}

Contributors
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namhyung kim
namhyung kim
67
41.10%
2
40.00%
frederic weisbecker
frederic weisbecker
64
39.26%
1
20.00%
arnaldo carvalho de melo
arnaldo carvalho de melo
32
19.63%
2
40.00%
Total
163
100.00%
5
100.00%



bool have_tracepoints(struct list_head *pattrs)
{
	struct perf_evsel *pos;

	list_for_each_entry(pos, pattrs, node)
		if (pos->attr.type == PERF_TYPE_TRACEPOINT)
			return true;

	return false;
}

Contributors
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tom zanussi
tom zanussi
23
58.97%
2
66.67%
arnaldo carvalho de melo
arnaldo carvalho de melo
16
41.03%
1
33.33%
Total
39
100.00%
3
100.00%



static int tracing_data_header(void)
{
	char buf[20];
	ssize_t size;

	/* just guessing this is someone's birthday.. ;) */
	buf[0] = 23;
	buf[1] = 8;
	buf[2] = 68;
	memcpy(buf + 3, "tracing", 7);

	if (write(output_fd, buf, 10) != 10)
		return -1;

	size = strlen(VERSION) + 1;
	if (write(output_fd, VERSION, size) != size)
		return -1;

	/* save endian */
	if (bigendian())
		buf[0] = 1;
	else
		buf[0] = 0;

	if (write(output_fd, buf, 1) != 1)
		return -1;

	/* save size of long */
	buf[0] = sizeof(long);
	if (write(output_fd, buf, 1) != 1)
		return -1;

	/* save page_size */
	if (write(output_fd, &page_size, 4) != 4)
		return -1;

	return 0;
}

Contributors
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Commits
CommitProp
steven rostedt
steven rostedt
101
55.80%
1
33.33%
namhyung kim
namhyung kim
74
40.88%
1
33.33%
jiri olsa
jiri olsa
6
3.31%
1
33.33%
Total
181
100.00%
3
100.00%



struct tracing_data *tracing_data_get(struct list_head *pattrs,
				      int fd, bool temp)
{
	struct tracepoint_path *tps;
	struct tracing_data *tdata;
	int err;

	output_fd = fd;

	tps = get_tracepoints_path(pattrs);
	if (!tps)
		return NULL;

	tdata = malloc(sizeof(*tdata));
	if (!tdata)
		return NULL;

	tdata->temp = temp;
	tdata->size = 0;

	if (temp) {
		int temp_fd;

		snprintf(tdata->temp_file, sizeof(tdata->temp_file),
			 "/tmp/perf-XXXXXX");
		if (!mkstemp(tdata->temp_file)) {
			pr_debug("Can't make temp file");
			return NULL;
		}

		temp_fd = open(tdata->temp_file, O_RDWR);
		if (temp_fd < 0) {
			pr_debug("Can't read '%s'", tdata->temp_file);
			return NULL;
		}

		/*
                 * Set the temp file the default output, so all the
                 * tracing data are stored into it.
                 */
		output_fd = temp_fd;
	}

	err = tracing_data_header();
	if (err)
		goto out;
	err = record_header_files();
	if (err)
		goto out;
	err = record_ftrace_files(tps);
	if (err)
		goto out;
	err = record_event_files(tps);
	if (err)
		goto out;
	err = record_proc_kallsyms();
	if (err)
		goto out;
	err = record_ftrace_printk();

out:
	/*
         * All tracing data are stored by now, we can restore
         * the default output file in case we used temp file.
         */
	if (temp) {
		tdata->size = lseek(output_fd, 0, SEEK_CUR);
		close(output_fd);
		output_fd = fd;
	}

	if (err)
		zfree(&tdata);

	put_tracepoints_path(tps);
	return tdata;
}

Contributors
Person
Tokens
Prop
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CommitProp
jiri olsa
jiri olsa
175
62.50%
1
11.11%
namhyung kim
namhyung kim
86
30.71%
4
44.44%
steven rostedt
steven rostedt
9
3.21%
1
11.11%
frederic weisbecker
frederic weisbecker
6
2.14%
1
11.11%
arnaldo carvalho de melo
arnaldo carvalho de melo
4
1.43%
2
22.22%
Total
280
100.00%
9
100.00%



int tracing_data_put(struct tracing_data *tdata)
{
	int err = 0;

	if (tdata->temp) {
		err = record_file(tdata->temp_file, 0);
		unlink(tdata->temp_file);
	}

	free(tdata);
	return err;
}

Contributors
Person
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jiri olsa
jiri olsa
38
77.55%
1
50.00%
namhyung kim
namhyung kim
11
22.45%
1
50.00%
Total
49
100.00%
2
100.00%



int read_tracing_data(int fd, struct list_head *pattrs)
{
	int err;
	struct tracing_data *tdata;

	/*
         * We work over the real file, so we can write data
         * directly, no temp file is needed.
         */
	tdata = tracing_data_get(pattrs, fd, false);
	if (!tdata)
		return -ENOMEM;

	err = tracing_data_put(tdata);
	return err;
}
Contributors
Person
Tokens
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CommitProp
tom zanussi
tom zanussi
24
46.15%
1
25.00%
jiri olsa
jiri olsa
21
40.38%
1
25.00%
namhyung kim
namhyung kim
6
11.54%
1
25.00%
arnaldo carvalho de melo
arnaldo carvalho de melo
1
1.92%
1
25.00%
Total
52
100.00%
4
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
steven rostedt
steven rostedt
915
37.78%
1
3.70%
namhyung kim
namhyung kim
745
30.76%
6
22.22%
jiri olsa
jiri olsa
250
10.32%
3
11.11%
frederic weisbecker
frederic weisbecker
224
9.25%
1
3.70%
sonny rao
sonny rao
79
3.26%
1
3.70%
arnaldo carvalho de melo
arnaldo carvalho de melo
76
3.14%
6
22.22%
tom zanussi
tom zanussi
47
1.94%
3
11.11%
andy shevchenko
andy shevchenko
33
1.36%
1
3.70%
ulrich drepper
ulrich drepper
27
1.11%
1
3.70%
xiao guangrong
xiao guangrong
12
0.50%
2
7.41%
li zefan
li zefan
10
0.41%
1
3.70%
ingo molnar
ingo molnar
4
0.17%
1
3.70%
Total
2422
100.00%
27
100.00%
Directory: tools/perf/util

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