[deliverable/linux.git] / 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
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
#define _GNU_SOURCE
#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 <ctype.h>
#include <errno.h>
#include <stdbool.h>
#include <linux/kernel.h>

#include "../perf.h"
#include "trace-event.h"
#include "debugfs.h"

#define VERSION "0.5"

#define _STR(x) #x
#define STR(x) _STR(x)
#define MAX_PATH 256

#define TRACE_CTRL	"tracing_on"
#define TRACE		"trace"
#define AVAILABLE	"available_tracers"
#define CURRENT		"current_tracer"
#define ITER_CTRL	"trace_options"
#define MAX_LATENCY	"tracing_max_latency"

unsigned int page_size;

static const char *output_file = "trace.info";
static int output_fd;

struct event_list {
	struct event_list *next;
	const char *event;
};

struct events {
	struct events *sibling;
	struct events *children;
	struct events *next;
	char *name;
};


static void die(const char *fmt, ...)
{
	va_list ap;
	int ret = errno;

	if (errno)
		perror("trace-cmd");
	else
		ret = -1;

	va_start(ap, fmt);
	fprintf(stderr, "  ");
	vfprintf(stderr, fmt, ap);
	va_end(ap);

	fprintf(stderr, "\n");
	exit(ret);
}

void *malloc_or_die(unsigned int size)
{
	void *data;

	data = malloc(size);
	if (!data)
		die("malloc");
	return data;
}

static const char *find_debugfs(void)
{
	const char *path = debugfs_mount(NULL);

	if (!path)
		die("Your kernel not support debugfs filesystem");

	return path;
}

/*
 * Finds the path to the debugfs/tracing
 * Allocates the string and stores it.
 */
static const char *find_tracing_dir(void)
{
	static char *tracing;
	static int tracing_found;
	const char *debugfs;

	if (tracing_found)
		return tracing;

	debugfs = find_debugfs();

	tracing = malloc_or_die(strlen(debugfs) + 9);

	sprintf(tracing, "%s/tracing", debugfs);

	tracing_found = 1;
	return tracing;
}

static char *get_tracing_file(const char *name)
{
	const char *tracing;
	char *file;

	tracing = find_tracing_dir();
	if (!tracing)
		return NULL;

	file = malloc_or_die(strlen(tracing) + strlen(name) + 2);

	sprintf(file, "%s/%s", tracing, name);
	return file;
}

static void put_tracing_file(char *file)
{
	free(file);
}

static ssize_t calc_data_size;

static ssize_t write_or_die(const void *buf, size_t len)
{
	int ret;

	if (calc_data_size) {
		calc_data_size += len;
		return len;
	}

	ret = write(output_fd, buf, len);
	if (ret < 0)
		die("writing to '%s'", output_file);

	return ret;
}

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;
}

static unsigned long long copy_file_fd(int fd)
{
	unsigned long long size = 0;
	char buf[BUFSIZ];
	int r;

	do {
		r = read(fd, buf, BUFSIZ);
		if (r > 0) {
			size += r;
			write_or_die(buf, r);
		}
	} while (r > 0);

	return size;
}

static unsigned long long copy_file(const char *file)
{
	unsigned long long size = 0;
	int fd;

	fd = open(file, O_RDONLY);
	if (fd < 0)
		die("Can't read '%s'", file);
	size = copy_file_fd(fd);
	close(fd);

	return size;
}

static unsigned long get_size_fd(int fd)
{
	unsigned long long size = 0;
	char buf[BUFSIZ];
	int r;

	do {
		r = read(fd, buf, BUFSIZ);
		if (r > 0)
			size += r;
	} while (r > 0);

	lseek(fd, 0, SEEK_SET);

	return size;
}

static unsigned long get_size(const char *file)
{
	unsigned long long size = 0;
	int fd;

	fd = open(file, O_RDONLY);
	if (fd < 0)
		die("Can't read '%s'", file);
	size = get_size_fd(fd);
	close(fd);

	return size;
}

static void read_header_files(void)
{
	unsigned long long size, check_size;
	char *path;
	int fd;

	path = get_tracing_file("events/header_page");
	fd = open(path, O_RDONLY);
	if (fd < 0)
		die("can't read '%s'", path);

	/* unfortunately, you can not stat debugfs files for size */
	size = get_size_fd(fd);

	write_or_die("header_page", 12);
	write_or_die(&size, 8);
	check_size = copy_file_fd(fd);
	close(fd);

	if (size != check_size)
		die("wrong size for '%s' size=%lld read=%lld",
		    path, size, check_size);
	put_tracing_file(path);

	path = get_tracing_file("events/header_event");
	fd = open(path, O_RDONLY);
	if (fd < 0)
		die("can't read '%s'", path);

	size = get_size_fd(fd);

	write_or_die("header_event", 13);
	write_or_die(&size, 8);
	check_size = copy_file_fd(fd);
	if (size != check_size)
		die("wrong size for '%s'", path);
	put_tracing_file(path);
	close(fd);
}

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;
}

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

	dir = opendir(sys);
	if (!dir)
		die("can't read directory '%s'", sys);

	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;
		format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
		sprintf(format, "%s/%s/format", sys, dent->d_name);
		ret = stat(format, &st);
		free(format);
		if (ret < 0)
			continue;
		count++;
	}

	write_or_die(&count, 4);

	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;
		format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
		sprintf(format, "%s/%s/format", sys, dent->d_name);
		ret = stat(format, &st);

		if (ret >= 0) {
			/* unfortunately, you can not stat debugfs files for size */
			size = get_size(format);
			write_or_die(&size, 8);
			check_size = copy_file(format);
			if (size != check_size)
				die("error in size of file '%s'", format);
		}

		free(format);
	}
	closedir(dir);
}

static void read_ftrace_files(struct tracepoint_path *tps)
{
	char *path;

	path = get_tracing_file("events/ftrace");

	copy_event_system(path, tps);

	put_tracing_file(path);
}

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;
}

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

	path = get_tracing_file("events");

	dir = opendir(path);
	if (!dir)
		die("can't read directory '%s'", path);

	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++;
	}

	write_or_die(&count, 4);

	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;
		sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
		sprintf(sys, "%s/%s", path, dent->d_name);
		ret = stat(sys, &st);
		if (ret >= 0) {
			write_or_die(dent->d_name, strlen(dent->d_name) + 1);
			copy_event_system(sys, tps);
		}
		free(sys);
	}

	closedir(dir);
	put_tracing_file(path);
}

static void read_proc_kallsyms(void)
{
	unsigned int size, check_size;
	const char *path = "/proc/kallsyms";
	struct stat st;
	int ret;

	ret = stat(path, &st);
	if (ret < 0) {
		/* not found */
		size = 0;
		write_or_die(&size, 4);
		return;
	}
	size = get_size(path);
	write_or_die(&size, 4);
	check_size = copy_file(path);
	if (size != check_size)
		die("error in size of file '%s'", path);

}

static void read_ftrace_printk(void)
{
	unsigned int size, check_size;
	char *path;
	struct stat st;
	int ret;

	path = get_tracing_file("printk_formats");
	ret = stat(path, &st);
	if (ret < 0) {
		/* not found */
		size = 0;
		write_or_die(&size, 4);
		goto out;
	}
	size = get_size(path);
	write_or_die(&size, 4);
	check_size = copy_file(path);
	if (size != check_size)
		die("error in size of file '%s'", path);
out:
	put_tracing_file(path);
}

static struct tracepoint_path *
get_tracepoints_path(struct perf_event_attr *pattrs, int nb_events)
{
	struct tracepoint_path path, *ppath = &path;
	int i, nr_tracepoints = 0;

	for (i = 0; i < nb_events; i++) {
		if (pattrs[i].type != PERF_TYPE_TRACEPOINT)
			continue;
		++nr_tracepoints;
		ppath->next = tracepoint_id_to_path(pattrs[i].config);
		if (!ppath->next)
			die("%s\n", "No memory to alloc tracepoints list");
		ppath = ppath->next;
	}

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

bool have_tracepoints(struct perf_event_attr *pattrs, int nb_events)
{
	int i;

	for (i = 0; i < nb_events; i++)
		if (pattrs[i].type == PERF_TYPE_TRACEPOINT)
			return true;

	return false;
}

int read_tracing_data(int fd, struct perf_event_attr *pattrs, int nb_events)
{
	char buf[BUFSIZ];
	struct tracepoint_path *tps = get_tracepoints_path(pattrs, nb_events);

	/*
	 * What? No tracepoints? No sense writing anything here, bail out.
	 */
	if (tps == NULL)
		return -1;

	output_fd = fd;

	buf[0] = 23;
	buf[1] = 8;
	buf[2] = 68;
	memcpy(buf + 3, "tracing", 7);

	write_or_die(buf, 10);

	write_or_die(VERSION, strlen(VERSION) + 1);

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

	write_or_die(buf, 1);

	/* save size of long */
	buf[0] = sizeof(long);
	write_or_die(buf, 1);

	/* save page_size */
	page_size = sysconf(_SC_PAGESIZE);
	write_or_die(&page_size, 4);

	read_header_files();
	read_ftrace_files(tps);
	read_event_files(tps);
	read_proc_kallsyms();
	read_ftrace_printk();

	return 0;
}

ssize_t read_tracing_data_size(int fd, struct perf_event_attr *pattrs,
			       int nb_events)
{
	ssize_t size;
	int err = 0;

	calc_data_size = 1;
	err = read_tracing_data(fd, pattrs, nb_events);
	size = calc_data_size - 1;
	calc_data_size = 0;

	if (err < 0)
		return err;

	return size;
}
Commit	Line	Data
52050943 SR	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	#define _GNU_SOURCE
	22	#include <dirent.h>
659d8cfb	23	#include <mntent.h>
52050943 SR	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 <ctype.h>
	35	#include <errno.h>
1ef2ed10	36	#include <stdbool.h>
e2561368	37	#include <linux/kernel.h>
52050943	38
1ef2ed10	39	#include "../perf.h"
52050943	40	#include "trace-event.h"
61be3e59	41	#include "debugfs.h"
52050943	42
52050943 SR	43	#define VERSION "0.5"
	44
	45	#define _STR(x) #x
	46	#define STR(x) _STR(x)
	47	#define MAX_PATH 256
	48
	49	#define TRACE_CTRL "tracing_on"
	50	#define TRACE "trace"
	51	#define AVAILABLE "available_tracers"
	52	#define CURRENT "current_tracer"
	53	#define ITER_CTRL "trace_options"
	54	#define MAX_LATENCY "tracing_max_latency"
	55
	56	unsigned int page_size;
	57
	58	static const char *output_file = "trace.info";
	59	static int output_fd;
	60
	61	struct event_list {
	62	struct event_list *next;
	63	const char *event;
	64	};
	65
	66	struct events {
	67	struct events *sibling;
	68	struct events *children;
	69	struct events *next;
	70	char *name;
	71	};
	72
	73
	74
	75	static void die(const char *fmt, ...)
	76	{
	77	va_list ap;
	78	int ret = errno;
	79
	80	if (errno)
	81	perror("trace-cmd");
	82	else
	83	ret = -1;
	84
	85	va_start(ap, fmt);
	86	fprintf(stderr, " ");
	87	vfprintf(stderr, fmt, ap);
	88	va_end(ap);
	89
	90	fprintf(stderr, "\n");
	91	exit(ret);
	92	}
	93
	94	void *malloc_or_die(unsigned int size)
	95	{
	96	void *data;
	97
	98	data = malloc(size);
	99	if (!data)
	100	die("malloc");
	101	return data;
	102	}
	103
	104	static const char *find_debugfs(void)
	105	{
61be3e59	106	const char *path = debugfs_mount(NULL);
52050943	107
61be3e59 XG	108	if (!path)
61be3e59 XG	109	die("Your kernel not support debugfs filesystem");
52050943	110
61be3e59	111	return path;
52050943 SR	112	}
	113
	114	/*
	115	* Finds the path to the debugfs/tracing
	116	* Allocates the string and stores it.
	117	*/
	118	static const char *find_tracing_dir(void)
	119	{
	120	static char *tracing;
	121	static int tracing_found;
	122	const char *debugfs;
	123
	124	if (tracing_found)
	125	return tracing;
	126
	127	debugfs = find_debugfs();
	128
	129	tracing = malloc_or_die(strlen(debugfs) + 9);
	130
	131	sprintf(tracing, "%s/tracing", debugfs);
	132
	133	tracing_found = 1;
	134	return tracing;
	135	}
	136
	137	static char get_tracing_file(const char name)
	138	{
	139	const char *tracing;
	140	char *file;
	141
	142	tracing = find_tracing_dir();
	143	if (!tracing)
	144	return NULL;
	145
	146	file = malloc_or_die(strlen(tracing) + strlen(name) + 2);
	147
	148	sprintf(file, "%s/%s", tracing, name);
	149	return file;
	150	}
	151
	152	static void put_tracing_file(char *file)
	153	{
	154	free(file);
	155	}
	156
9215545e TZ	157	static ssize_t calc_data_size;
9215545e TZ	158
52050943 SR	159	static ssize_t write_or_die(const void *buf, size_t len)
	160	{
	161	int ret;
	162
9215545e TZ	163	if (calc_data_size) {
	164	calc_data_size += len;
	165	return len;
	166	}
	167
52050943 SR	168	ret = write(output_fd, buf, len);
	169	if (ret < 0)
	170	die("writing to '%s'", output_file);
	171
	172	return ret;
	173	}
	174
	175	int bigendian(void)
	176	{
	177	unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
	178	unsigned int *ptr;
	179
65014ab3	180	ptr = (unsigned int )(void )str;
52050943 SR	181	return *ptr == 0x01020304;
	182	}
	183
	184	static unsigned long long copy_file_fd(int fd)
	185	{
	186	unsigned long long size = 0;
	187	char buf[BUFSIZ];
	188	int r;
	189
	190	do {
	191	r = read(fd, buf, BUFSIZ);
	192	if (r > 0) {
	193	size += r;
	194	write_or_die(buf, r);
	195	}
	196	} while (r > 0);
	197
	198	return size;
	199	}
	200
	201	static unsigned long long copy_file(const char *file)
	202	{
	203	unsigned long long size = 0;
	204	int fd;
	205
	206	fd = open(file, O_RDONLY);
	207	if (fd < 0)
	208	die("Can't read '%s'", file);
	209	size = copy_file_fd(fd);
	210	close(fd);
	211
	212	return size;
	213	}
	214
	215	static unsigned long get_size_fd(int fd)
	216	{
	217	unsigned long long size = 0;
	218	char buf[BUFSIZ];
	219	int r;
	220
	221	do {
	222	r = read(fd, buf, BUFSIZ);
	223	if (r > 0)
	224	size += r;
	225	} while (r > 0);
	226
	227	lseek(fd, 0, SEEK_SET);
	228
	229	return size;
	230	}
	231
	232	static unsigned long get_size(const char *file)
	233	{
	234	unsigned long long size = 0;
	235	int fd;
	236
	237	fd = open(file, O_RDONLY);
	238	if (fd < 0)
	239	die("Can't read '%s'", file);
	240	size = get_size_fd(fd);
	241	close(fd);
	242
	243	return size;
	244	}
245
246	static void read_header_files(void)
247	{
248	unsigned long long size, check_size;
249	char *path;
250	int fd;
251
252	path = get_tracing_file("events/header_page");
253	fd = open(path, O_RDONLY);
254	if (fd < 0)
255	die("can't read '%s'", path);
256
257	/* unfortunately, you can not stat debugfs files for size */
258	size = get_size_fd(fd);
259
260	write_or_die("header_page", 12);
261	write_or_die(&size, 8);
262	check_size = copy_file_fd(fd);
9967411e XG	263	close(fd);
9967411e XG	264
52050943 SR	265	if (size != check_size)
	266	die("wrong size for '%s' size=%lld read=%lld",
	267	path, size, check_size);
	268	put_tracing_file(path);
	269
	270	path = get_tracing_file("events/header_event");
	271	fd = open(path, O_RDONLY);
	272	if (fd < 0)
	273	die("can't read '%s'", path);
	274
	275	size = get_size_fd(fd);
	276
	277	write_or_die("header_event", 13);
	278	write_or_die(&size, 8);
	279	check_size = copy_file_fd(fd);
	280	if (size != check_size)
	281	die("wrong size for '%s'", path);
	282	put_tracing_file(path);
9967411e	283	close(fd);
52050943 SR	284	}
52050943 SR	285
1ef2ed10 FW	286	static bool name_in_tp_list(char sys, struct tracepoint_path tps)
	287	{
	288	while (tps) {
	289	if (!strcmp(sys, tps->name))
	290	return true;
	291	tps = tps->next;
	292	}
	293
	294	return false;
	295	}
	296
	297	static void copy_event_system(const char sys, struct tracepoint_path tps)
52050943 SR	298	{
	299	unsigned long long size, check_size;
	300	struct dirent *dent;
	301	struct stat st;
	302	char *format;
	303	DIR *dir;
	304	int count = 0;
	305	int ret;
	306
	307	dir = opendir(sys);
	308	if (!dir)
	309	die("can't read directory '%s'", sys);
	310
	311	while ((dent = readdir(dir))) {
659d8cfb UD	312	if (dent->d_type != DT_DIR \|\|
659d8cfb UD	313	strcmp(dent->d_name, ".") == 0 \|\|
1ef2ed10 FW	314	strcmp(dent->d_name, "..") == 0 \|\|
1ef2ed10 FW	315	!name_in_tp_list(dent->d_name, tps))
52050943 SR	316	continue;
	317	format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
	318	sprintf(format, "%s/%s/format", sys, dent->d_name);
	319	ret = stat(format, &st);
	320	free(format);
	321	if (ret < 0)
	322	continue;
	323	count++;
	324	}
	325
	326	write_or_die(&count, 4);
	327
	328	rewinddir(dir);
	329	while ((dent = readdir(dir))) {
659d8cfb UD	330	if (dent->d_type != DT_DIR \|\|
659d8cfb UD	331	strcmp(dent->d_name, ".") == 0 \|\|
1ef2ed10 FW	332	strcmp(dent->d_name, "..") == 0 \|\|
1ef2ed10 FW	333	!name_in_tp_list(dent->d_name, tps))
52050943 SR	334	continue;
	335	format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
	336	sprintf(format, "%s/%s/format", sys, dent->d_name);
	337	ret = stat(format, &st);
	338
	339	if (ret >= 0) {
	340	/* unfortunately, you can not stat debugfs files for size */
	341	size = get_size(format);
	342	write_or_die(&size, 8);
	343	check_size = copy_file(format);
	344	if (size != check_size)
	345	die("error in size of file '%s'", format);
	346	}
	347
	348	free(format);
	349	}
9967411e	350	closedir(dir);
52050943 SR	351	}
52050943 SR	352
1ef2ed10	353	static void read_ftrace_files(struct tracepoint_path *tps)
52050943 SR	354	{
	355	char *path;
	356
	357	path = get_tracing_file("events/ftrace");
	358
1ef2ed10	359	copy_event_system(path, tps);
52050943 SR	360
	361	put_tracing_file(path);
	362	}
	363
1ef2ed10 FW	364	static bool system_in_tp_list(char sys, struct tracepoint_path tps)
	365	{
	366	while (tps) {
	367	if (!strcmp(sys, tps->system))
	368	return true;
	369	tps = tps->next;
	370	}
	371
	372	return false;
	373	}
	374
	375	static void read_event_files(struct tracepoint_path *tps)
52050943 SR	376	{
	377	struct dirent *dent;
	378	struct stat st;
	379	char *path;
	380	char *sys;
	381	DIR *dir;
	382	int count = 0;
	383	int ret;
	384
	385	path = get_tracing_file("events");
	386
	387	dir = opendir(path);
	388	if (!dir)
	389	die("can't read directory '%s'", path);
	390
	391	while ((dent = readdir(dir))) {
659d8cfb UD	392	if (dent->d_type != DT_DIR \|\|
659d8cfb UD	393	strcmp(dent->d_name, ".") == 0 \|\|
52050943	394	strcmp(dent->d_name, "..") == 0 \|\|
1ef2ed10 FW	395	strcmp(dent->d_name, "ftrace") == 0 \|\|
1ef2ed10 FW	396	!system_in_tp_list(dent->d_name, tps))
52050943	397	continue;
659d8cfb	398	count++;
52050943 SR	399	}
	400
	401	write_or_die(&count, 4);
	402
	403	rewinddir(dir);
	404	while ((dent = readdir(dir))) {
659d8cfb UD	405	if (dent->d_type != DT_DIR \|\|
659d8cfb UD	406	strcmp(dent->d_name, ".") == 0 \|\|
52050943	407	strcmp(dent->d_name, "..") == 0 \|\|
1ef2ed10 FW	408	strcmp(dent->d_name, "ftrace") == 0 \|\|
1ef2ed10 FW	409	!system_in_tp_list(dent->d_name, tps))
52050943 SR	410	continue;
	411	sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
	412	sprintf(sys, "%s/%s", path, dent->d_name);
	413	ret = stat(sys, &st);
	414	if (ret >= 0) {
659d8cfb UD	415	write_or_die(dent->d_name, strlen(dent->d_name) + 1);
659d8cfb UD	416	copy_event_system(sys, tps);
52050943 SR	417	}
	418	free(sys);
	419	}
	420
9967411e	421	closedir(dir);
52050943 SR	422	put_tracing_file(path);
	423	}
	424
	425	static void read_proc_kallsyms(void)
	426	{
	427	unsigned int size, check_size;
	428	const char *path = "/proc/kallsyms";
	429	struct stat st;
	430	int ret;
	431
	432	ret = stat(path, &st);
	433	if (ret < 0) {
	434	/* not found */
	435	size = 0;
	436	write_or_die(&size, 4);
	437	return;
	438	}
	439	size = get_size(path);
	440	write_or_die(&size, 4);
	441	check_size = copy_file(path);
	442	if (size != check_size)
	443	die("error in size of file '%s'", path);
	444
	445	}
	446
	447	static void read_ftrace_printk(void)
	448	{
	449	unsigned int size, check_size;
6706ccf8	450	char *path;
52050943 SR	451	struct stat st;
	452	int ret;
	453
	454	path = get_tracing_file("printk_formats");
	455	ret = stat(path, &st);
	456	if (ret < 0) {
	457	/* not found */
	458	size = 0;
	459	write_or_die(&size, 4);
6706ccf8	460	goto out;
52050943 SR	461	}
	462	size = get_size(path);
	463	write_or_die(&size, 4);
	464	check_size = copy_file(path);
	465	if (size != check_size)
	466	die("error in size of file '%s'", path);
6706ccf8 LZ	467	out:
6706ccf8 LZ	468	put_tracing_file(path);
52050943 SR	469	}
52050943 SR	470
1ef2ed10	471	static struct tracepoint_path *
cdd6c482	472	get_tracepoints_path(struct perf_event_attr *pattrs, int nb_events)
1ef2ed10 FW	473	{
1ef2ed10 FW	474	struct tracepoint_path path, *ppath = &path;
e2561368	475	int i, nr_tracepoints = 0;
1ef2ed10	476
cdd6c482	477	for (i = 0; i < nb_events; i++) {
1ef2ed10 FW	478	if (pattrs[i].type != PERF_TYPE_TRACEPOINT)
1ef2ed10 FW	479	continue;
e2561368	480	++nr_tracepoints;
1ef2ed10 FW	481	ppath->next = tracepoint_id_to_path(pattrs[i].config);
	482	if (!ppath->next)
	483	die("%s\n", "No memory to alloc tracepoints list");
	484	ppath = ppath->next;
	485	}
	486
e2561368	487	return nr_tracepoints > 0 ? path.next : NULL;
1ef2ed10	488	}
e2561368	489
63e0c771 TZ	490	bool have_tracepoints(struct perf_event_attr *pattrs, int nb_events)
63e0c771 TZ	491	{
db620b1c TZ	492	int i;
	493
	494	for (i = 0; i < nb_events; i++)
	495	if (pattrs[i].type == PERF_TYPE_TRACEPOINT)
	496	return true;
	497
	498	return false;
63e0c771 TZ	499	}
63e0c771 TZ	500
e2561368	501	int read_tracing_data(int fd, struct perf_event_attr *pattrs, int nb_events)
52050943 SR	502	{
52050943 SR	503	char buf[BUFSIZ];
e2561368 ACM	504	struct tracepoint_path *tps = get_tracepoints_path(pattrs, nb_events);
	505
	506	/*
	507	* What? No tracepoints? No sense writing anything here, bail out.
	508	*/
	509	if (tps == NULL)
	510	return -1;
52050943	511
03456a15	512	output_fd = fd;
52050943 SR	513
	514	buf[0] = 23;
	515	buf[1] = 8;
	516	buf[2] = 68;
	517	memcpy(buf + 3, "tracing", 7);
	518
	519	write_or_die(buf, 10);
	520
	521	write_or_die(VERSION, strlen(VERSION) + 1);
	522
	523	/* save endian */
	524	if (bigendian())
	525	buf[0] = 1;
	526	else
	527	buf[0] = 0;
	528
	529	write_or_die(buf, 1);
	530
	531	/* save size of long */
	532	buf[0] = sizeof(long);
	533	write_or_die(buf, 1);
	534
	535	/* save page_size */
1b75962e	536	page_size = sysconf(_SC_PAGESIZE);
52050943 SR	537	write_or_die(&page_size, 4);
	538
	539	read_header_files();
1ef2ed10 FW	540	read_ftrace_files(tps);
1ef2ed10 FW	541	read_event_files(tps);
52050943 SR	542	read_proc_kallsyms();
52050943 SR	543	read_ftrace_printk();
e2561368 ACM	544
e2561368 ACM	545	return 0;
52050943	546	}
9215545e TZ	547
	548	ssize_t read_tracing_data_size(int fd, struct perf_event_attr *pattrs,
	549	int nb_events)
	550	{
	551	ssize_t size;
	552	int err = 0;
	553
	554	calc_data_size = 1;
	555	err = read_tracing_data(fd, pattrs, nb_events);
	556	size = calc_data_size - 1;
	557	calc_data_size = 0;
	558
	559	if (err < 0)
	560	return err;
	561
	562	return size;
	563	}