blob: a8d81c35ef66c85fecb007d3e3fecc8c28f0ffa5 [file] [log] [blame]
/*
* 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 "debugfs.h"
#include "evsel.h"
#define VERSION "0.5"
#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 *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;
}
/* unfortunately, you can not stat debugfs or proc files for size */
static void record_file(const char *file, size_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;
fd = open(file, O_RDONLY);
if (fd < 0)
die("Can't read '%s'", file);
/* put in zeros for file size, then fill true size later */
if (hdr_sz)
write_or_die(&size, hdr_sz);
do {
r = read(fd, buf, BUFSIZ);
if (r > 0) {
size += r;
write_or_die(buf, r);
}
} while (r > 0);
close(fd);
/* 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)
die("writing to %s", output_file);
}
static void read_header_files(void)
{
char *path;
struct stat st;
path = get_tracing_file("events/header_page");
if (stat(path, &st) < 0)
die("can't read '%s'", path);
write_or_die("header_page", 12);
record_file(path, 8);
put_tracing_file(path);
path = get_tracing_file("events/header_event");
if (stat(path, &st) < 0)
die("can't read '%s'", path);
write_or_die("header_event", 13);
record_file(path, 8);
put_tracing_file(path);
}
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)
{
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)
record_file(format, 8);
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;
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;
}
record_file(path, 4);
}
static void read_ftrace_printk(void)
{
unsigned int 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;
}
record_file(path, 4);
out:
put_tracing_file(path);
}
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;
ppath->next = tracepoint_id_to_path(pos->attr.config);
if (!ppath->next)
die("%s\n", "No memory to alloc tracepoints list");
ppath = ppath->next;
}
return nr_tracepoints > 0 ? path.next : NULL;
}
static void
put_tracepoints_path(struct tracepoint_path *tps)
{
while (tps) {
struct tracepoint_path *t = tps;
tps = tps->next;
free(t->name);
free(t->system);
free(t);
}
}
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;
}
static void tracing_data_header(void)
{
char buf[20];
/* just guessing this is someone's birthday.. ;) */
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;
read_trace_init(buf[0], buf[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);
}
struct tracing_data *tracing_data_get(struct list_head *pattrs,
int fd, bool temp)
{
struct tracepoint_path *tps;
struct tracing_data *tdata;
output_fd = fd;
tps = get_tracepoints_path(pattrs);
if (!tps)
return NULL;
tdata = malloc_or_die(sizeof(*tdata));
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))
die("Can't make temp file");
temp_fd = open(tdata->temp_file, O_RDWR);
if (temp_fd < 0)
die("Can't read '%s'", tdata->temp_file);
/*
* Set the temp file the default output, so all the
* tracing data are stored into it.
*/
output_fd = temp_fd;
}
tracing_data_header();
read_header_files();
read_ftrace_files(tps);
read_event_files(tps);
read_proc_kallsyms();
read_ftrace_printk();
/*
* 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;
}
put_tracepoints_path(tps);
return tdata;
}
void tracing_data_put(struct tracing_data *tdata)
{
if (tdata->temp) {
record_file(tdata->temp_file, 0);
unlink(tdata->temp_file);
}
free(tdata);
}
int read_tracing_data(int fd, struct list_head *pattrs)
{
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;
tracing_data_put(tdata);
return 0;
}