529 lines
10 KiB
C
529 lines
10 KiB
C
/*
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* Copyright (C) 2008,2009, Steven Rostedt <srostedt@redhat.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License (not later!)
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#define _GNU_SOURCE
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#include <dirent.h>
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#include <mntent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <pthread.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <linux/kernel.h>
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#include "../perf.h"
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#include "trace-event.h"
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#include "debugfs.h"
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#define VERSION "0.5"
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#define _STR(x) #x
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#define STR(x) _STR(x)
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#define MAX_PATH 256
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#define TRACE_CTRL "tracing_on"
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#define TRACE "trace"
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#define AVAILABLE "available_tracers"
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#define CURRENT "current_tracer"
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#define ITER_CTRL "trace_options"
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#define MAX_LATENCY "tracing_max_latency"
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unsigned int page_size;
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static const char *output_file = "trace.info";
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static int output_fd;
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struct event_list {
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struct event_list *next;
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const char *event;
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};
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struct events {
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struct events *sibling;
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struct events *children;
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struct events *next;
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char *name;
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};
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static void die(const char *fmt, ...)
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{
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va_list ap;
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int ret = errno;
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if (errno)
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perror("trace-cmd");
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else
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ret = -1;
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va_start(ap, fmt);
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fprintf(stderr, " ");
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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fprintf(stderr, "\n");
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exit(ret);
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}
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void *malloc_or_die(unsigned int size)
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{
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void *data;
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data = malloc(size);
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if (!data)
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die("malloc");
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return data;
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}
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static const char *find_debugfs(void)
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{
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const char *path = debugfs_mount(NULL);
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if (!path)
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die("Your kernel not support debugfs filesystem");
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return path;
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}
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/*
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* Finds the path to the debugfs/tracing
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* Allocates the string and stores it.
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*/
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static const char *find_tracing_dir(void)
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{
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static char *tracing;
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static int tracing_found;
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const char *debugfs;
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if (tracing_found)
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return tracing;
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debugfs = find_debugfs();
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tracing = malloc_or_die(strlen(debugfs) + 9);
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sprintf(tracing, "%s/tracing", debugfs);
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tracing_found = 1;
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return tracing;
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}
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static char *get_tracing_file(const char *name)
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{
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const char *tracing;
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char *file;
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tracing = find_tracing_dir();
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if (!tracing)
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return NULL;
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file = malloc_or_die(strlen(tracing) + strlen(name) + 2);
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sprintf(file, "%s/%s", tracing, name);
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return file;
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}
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static void put_tracing_file(char *file)
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{
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free(file);
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}
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static ssize_t write_or_die(const void *buf, size_t len)
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{
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int ret;
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ret = write(output_fd, buf, len);
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if (ret < 0)
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die("writing to '%s'", output_file);
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return ret;
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}
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int bigendian(void)
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{
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unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
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unsigned int *ptr;
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ptr = (unsigned int *)(void *)str;
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return *ptr == 0x01020304;
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}
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static unsigned long long copy_file_fd(int fd)
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{
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unsigned long long size = 0;
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char buf[BUFSIZ];
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int r;
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do {
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r = read(fd, buf, BUFSIZ);
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if (r > 0) {
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size += r;
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write_or_die(buf, r);
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}
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} while (r > 0);
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return size;
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}
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static unsigned long long copy_file(const char *file)
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{
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unsigned long long size = 0;
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int fd;
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fd = open(file, O_RDONLY);
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if (fd < 0)
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die("Can't read '%s'", file);
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size = copy_file_fd(fd);
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close(fd);
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return size;
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}
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static unsigned long get_size_fd(int fd)
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{
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unsigned long long size = 0;
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char buf[BUFSIZ];
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int r;
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do {
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r = read(fd, buf, BUFSIZ);
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if (r > 0)
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size += r;
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} while (r > 0);
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lseek(fd, 0, SEEK_SET);
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return size;
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}
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static unsigned long get_size(const char *file)
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{
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unsigned long long size = 0;
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int fd;
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fd = open(file, O_RDONLY);
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if (fd < 0)
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die("Can't read '%s'", file);
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size = get_size_fd(fd);
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close(fd);
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return size;
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}
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static void read_header_files(void)
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{
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unsigned long long size, check_size;
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char *path;
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int fd;
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path = get_tracing_file("events/header_page");
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fd = open(path, O_RDONLY);
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if (fd < 0)
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die("can't read '%s'", path);
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/* unfortunately, you can not stat debugfs files for size */
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size = get_size_fd(fd);
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write_or_die("header_page", 12);
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write_or_die(&size, 8);
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check_size = copy_file_fd(fd);
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close(fd);
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if (size != check_size)
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die("wrong size for '%s' size=%lld read=%lld",
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path, size, check_size);
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put_tracing_file(path);
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path = get_tracing_file("events/header_event");
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fd = open(path, O_RDONLY);
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if (fd < 0)
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die("can't read '%s'", path);
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size = get_size_fd(fd);
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write_or_die("header_event", 13);
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write_or_die(&size, 8);
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check_size = copy_file_fd(fd);
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if (size != check_size)
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die("wrong size for '%s'", path);
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put_tracing_file(path);
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close(fd);
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}
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static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
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{
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while (tps) {
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if (!strcmp(sys, tps->name))
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return true;
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tps = tps->next;
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}
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return false;
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}
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static void copy_event_system(const char *sys, struct tracepoint_path *tps)
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{
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unsigned long long size, check_size;
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struct dirent *dent;
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struct stat st;
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char *format;
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DIR *dir;
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int count = 0;
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int ret;
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dir = opendir(sys);
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if (!dir)
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die("can't read directory '%s'", sys);
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while ((dent = readdir(dir))) {
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if (dent->d_type != DT_DIR ||
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strcmp(dent->d_name, ".") == 0 ||
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strcmp(dent->d_name, "..") == 0 ||
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!name_in_tp_list(dent->d_name, tps))
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continue;
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format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
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sprintf(format, "%s/%s/format", sys, dent->d_name);
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ret = stat(format, &st);
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free(format);
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if (ret < 0)
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continue;
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count++;
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}
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write_or_die(&count, 4);
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rewinddir(dir);
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while ((dent = readdir(dir))) {
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if (dent->d_type != DT_DIR ||
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strcmp(dent->d_name, ".") == 0 ||
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strcmp(dent->d_name, "..") == 0 ||
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!name_in_tp_list(dent->d_name, tps))
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continue;
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format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
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sprintf(format, "%s/%s/format", sys, dent->d_name);
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ret = stat(format, &st);
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if (ret >= 0) {
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/* unfortunately, you can not stat debugfs files for size */
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size = get_size(format);
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write_or_die(&size, 8);
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check_size = copy_file(format);
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if (size != check_size)
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die("error in size of file '%s'", format);
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}
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free(format);
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}
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closedir(dir);
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}
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static void read_ftrace_files(struct tracepoint_path *tps)
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{
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char *path;
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path = get_tracing_file("events/ftrace");
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copy_event_system(path, tps);
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put_tracing_file(path);
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}
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static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
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{
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while (tps) {
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if (!strcmp(sys, tps->system))
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return true;
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tps = tps->next;
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}
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return false;
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}
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static void read_event_files(struct tracepoint_path *tps)
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{
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struct dirent *dent;
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struct stat st;
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char *path;
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char *sys;
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DIR *dir;
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int count = 0;
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int ret;
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path = get_tracing_file("events");
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dir = opendir(path);
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if (!dir)
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die("can't read directory '%s'", path);
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while ((dent = readdir(dir))) {
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if (dent->d_type != DT_DIR ||
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strcmp(dent->d_name, ".") == 0 ||
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strcmp(dent->d_name, "..") == 0 ||
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strcmp(dent->d_name, "ftrace") == 0 ||
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!system_in_tp_list(dent->d_name, tps))
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continue;
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count++;
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}
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write_or_die(&count, 4);
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rewinddir(dir);
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while ((dent = readdir(dir))) {
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if (dent->d_type != DT_DIR ||
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strcmp(dent->d_name, ".") == 0 ||
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strcmp(dent->d_name, "..") == 0 ||
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strcmp(dent->d_name, "ftrace") == 0 ||
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!system_in_tp_list(dent->d_name, tps))
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continue;
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sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
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sprintf(sys, "%s/%s", path, dent->d_name);
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ret = stat(sys, &st);
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if (ret >= 0) {
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write_or_die(dent->d_name, strlen(dent->d_name) + 1);
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copy_event_system(sys, tps);
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}
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free(sys);
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}
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closedir(dir);
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put_tracing_file(path);
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}
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static void read_proc_kallsyms(void)
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{
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unsigned int size, check_size;
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const char *path = "/proc/kallsyms";
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struct stat st;
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int ret;
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ret = stat(path, &st);
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if (ret < 0) {
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/* not found */
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size = 0;
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write_or_die(&size, 4);
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return;
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}
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size = get_size(path);
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write_or_die(&size, 4);
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check_size = copy_file(path);
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if (size != check_size)
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die("error in size of file '%s'", path);
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}
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static void read_ftrace_printk(void)
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{
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unsigned int size, check_size;
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char *path;
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struct stat st;
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int ret;
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path = get_tracing_file("printk_formats");
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ret = stat(path, &st);
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if (ret < 0) {
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/* not found */
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size = 0;
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write_or_die(&size, 4);
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goto out;
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}
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size = get_size(path);
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write_or_die(&size, 4);
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check_size = copy_file(path);
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if (size != check_size)
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die("error in size of file '%s'", path);
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out:
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put_tracing_file(path);
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}
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static struct tracepoint_path *
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get_tracepoints_path(struct perf_event_attr *pattrs, int nb_events)
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{
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struct tracepoint_path path, *ppath = &path;
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int i, nr_tracepoints = 0;
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for (i = 0; i < nb_events; i++) {
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if (pattrs[i].type != PERF_TYPE_TRACEPOINT)
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continue;
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++nr_tracepoints;
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ppath->next = tracepoint_id_to_path(pattrs[i].config);
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if (!ppath->next)
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die("%s\n", "No memory to alloc tracepoints list");
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ppath = ppath->next;
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}
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return nr_tracepoints > 0 ? path.next : NULL;
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}
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int read_tracing_data(int fd, struct perf_event_attr *pattrs, int nb_events)
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{
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char buf[BUFSIZ];
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struct tracepoint_path *tps = get_tracepoints_path(pattrs, nb_events);
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/*
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* What? No tracepoints? No sense writing anything here, bail out.
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*/
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if (tps == NULL)
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return -1;
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output_fd = fd;
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buf[0] = 23;
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buf[1] = 8;
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buf[2] = 68;
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memcpy(buf + 3, "tracing", 7);
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write_or_die(buf, 10);
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write_or_die(VERSION, strlen(VERSION) + 1);
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/* save endian */
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if (bigendian())
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buf[0] = 1;
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else
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buf[0] = 0;
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write_or_die(buf, 1);
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/* save size of long */
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buf[0] = sizeof(long);
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write_or_die(buf, 1);
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/* save page_size */
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page_size = getpagesize();
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write_or_die(&page_size, 4);
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read_header_files();
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read_ftrace_files(tps);
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read_event_files(tps);
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read_proc_kallsyms();
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read_ftrace_printk();
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return 0;
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}
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