mirror of https://gitee.com/openkylin/linux.git
496 lines
8.9 KiB
C
496 lines
8.9 KiB
C
/*
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* Copyright (C) 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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#include <dirent.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 <sys/mman.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include "../perf.h"
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#include "util.h"
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#include "trace-event.h"
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#include "debug.h"
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static int input_fd;
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static ssize_t trace_data_size;
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static bool repipe;
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static int __do_read(int fd, void *buf, int size)
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{
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int rsize = size;
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while (size) {
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int ret = read(fd, buf, size);
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if (ret <= 0)
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return -1;
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if (repipe) {
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int retw = write(STDOUT_FILENO, buf, ret);
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if (retw <= 0 || retw != ret) {
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pr_debug("repiping input file");
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return -1;
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}
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}
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size -= ret;
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buf += ret;
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}
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return rsize;
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}
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static int do_read(void *data, int size)
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{
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int r;
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r = __do_read(input_fd, data, size);
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if (r <= 0) {
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pr_debug("reading input file (size expected=%d received=%d)",
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size, r);
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return -1;
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}
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trace_data_size += r;
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return r;
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}
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/* If it fails, the next read will report it */
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static void skip(int size)
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{
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char buf[BUFSIZ];
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int r;
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while (size) {
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r = size > BUFSIZ ? BUFSIZ : size;
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do_read(buf, r);
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size -= r;
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};
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}
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static unsigned int read4(struct tep_handle *pevent)
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{
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unsigned int data;
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if (do_read(&data, 4) < 0)
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return 0;
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return tep_read_number(pevent, &data, 4);
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}
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static unsigned long long read8(struct tep_handle *pevent)
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{
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unsigned long long data;
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if (do_read(&data, 8) < 0)
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return 0;
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return tep_read_number(pevent, &data, 8);
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}
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static char *read_string(void)
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{
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char buf[BUFSIZ];
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char *str = NULL;
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int size = 0;
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off_t r;
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char c;
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for (;;) {
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r = read(input_fd, &c, 1);
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if (r < 0) {
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pr_debug("reading input file");
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goto out;
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}
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if (!r) {
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pr_debug("no data");
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goto out;
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}
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if (repipe) {
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int retw = write(STDOUT_FILENO, &c, 1);
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if (retw <= 0 || retw != r) {
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pr_debug("repiping input file string");
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goto out;
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}
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}
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buf[size++] = c;
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if (!c)
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break;
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}
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trace_data_size += size;
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str = malloc(size);
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if (str)
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memcpy(str, buf, size);
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out:
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return str;
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}
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static int read_proc_kallsyms(struct tep_handle *pevent)
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{
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unsigned int size;
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size = read4(pevent);
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if (!size)
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return 0;
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/*
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* Just skip it, now that we configure libtraceevent to use the
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* tools/perf/ symbol resolver.
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*
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* We need to skip it so that we can continue parsing old perf.data
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* files, that contains this /proc/kallsyms payload.
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*
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* Newer perf.data files will have just the 4-bytes zeros "kallsyms
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* payload", so that older tools can continue reading it and interpret
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* it as "no kallsyms payload is present".
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*/
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lseek(input_fd, size, SEEK_CUR);
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trace_data_size += size;
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return 0;
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}
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static int read_ftrace_printk(struct tep_handle *pevent)
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{
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unsigned int size;
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char *buf;
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/* it can have 0 size */
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size = read4(pevent);
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if (!size)
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return 0;
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buf = malloc(size + 1);
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if (buf == NULL)
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return -1;
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if (do_read(buf, size) < 0) {
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free(buf);
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return -1;
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}
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buf[size] = '\0';
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parse_ftrace_printk(pevent, buf, size);
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free(buf);
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return 0;
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}
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static int read_header_files(struct tep_handle *pevent)
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{
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unsigned long long size;
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char *header_page;
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char buf[BUFSIZ];
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int ret = 0;
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if (do_read(buf, 12) < 0)
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return -1;
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if (memcmp(buf, "header_page", 12) != 0) {
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pr_debug("did not read header page");
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return -1;
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}
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size = read8(pevent);
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header_page = malloc(size);
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if (header_page == NULL)
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return -1;
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if (do_read(header_page, size) < 0) {
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pr_debug("did not read header page");
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free(header_page);
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return -1;
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}
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if (!tep_parse_header_page(pevent, header_page, size,
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tep_get_long_size(pevent))) {
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/*
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* The commit field in the page is of type long,
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* use that instead, since it represents the kernel.
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*/
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tep_set_long_size(pevent, tep_get_header_page_size(pevent));
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}
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free(header_page);
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if (do_read(buf, 13) < 0)
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return -1;
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if (memcmp(buf, "header_event", 13) != 0) {
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pr_debug("did not read header event");
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return -1;
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}
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size = read8(pevent);
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skip(size);
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return ret;
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}
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static int read_ftrace_file(struct tep_handle *pevent, unsigned long long size)
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{
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int ret;
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char *buf;
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buf = malloc(size);
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if (buf == NULL) {
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pr_debug("memory allocation failure\n");
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return -1;
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}
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ret = do_read(buf, size);
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if (ret < 0) {
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pr_debug("error reading ftrace file.\n");
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goto out;
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}
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ret = parse_ftrace_file(pevent, buf, size);
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if (ret < 0)
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pr_debug("error parsing ftrace file.\n");
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out:
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free(buf);
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return ret;
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}
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static int read_event_file(struct tep_handle *pevent, char *sys,
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unsigned long long size)
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{
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int ret;
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char *buf;
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buf = malloc(size);
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if (buf == NULL) {
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pr_debug("memory allocation failure\n");
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return -1;
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}
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ret = do_read(buf, size);
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if (ret < 0)
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goto out;
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ret = parse_event_file(pevent, buf, size, sys);
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if (ret < 0)
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pr_debug("error parsing event file.\n");
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out:
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free(buf);
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return ret;
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}
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static int read_ftrace_files(struct tep_handle *pevent)
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{
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unsigned long long size;
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int count;
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int i;
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int ret;
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count = read4(pevent);
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for (i = 0; i < count; i++) {
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size = read8(pevent);
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ret = read_ftrace_file(pevent, size);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int read_event_files(struct tep_handle *pevent)
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{
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unsigned long long size;
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char *sys;
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int systems;
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int count;
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int i,x;
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int ret;
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systems = read4(pevent);
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for (i = 0; i < systems; i++) {
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sys = read_string();
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if (sys == NULL)
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return -1;
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count = read4(pevent);
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for (x=0; x < count; x++) {
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size = read8(pevent);
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ret = read_event_file(pevent, sys, size);
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if (ret) {
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free(sys);
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return ret;
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}
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}
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free(sys);
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}
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return 0;
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}
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static int read_saved_cmdline(struct tep_handle *pevent)
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{
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unsigned long long size;
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char *buf;
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int ret;
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/* it can have 0 size */
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size = read8(pevent);
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if (!size)
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return 0;
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buf = malloc(size + 1);
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if (buf == NULL) {
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pr_debug("memory allocation failure\n");
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return -1;
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}
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ret = do_read(buf, size);
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if (ret < 0) {
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pr_debug("error reading saved cmdlines\n");
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goto out;
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}
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parse_saved_cmdline(pevent, buf, size);
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ret = 0;
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out:
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free(buf);
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return ret;
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}
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ssize_t trace_report(int fd, struct trace_event *tevent, bool __repipe)
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{
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char buf[BUFSIZ];
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char test[] = { 23, 8, 68 };
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char *version;
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int show_version = 0;
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int show_funcs = 0;
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int show_printk = 0;
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ssize_t size = -1;
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int file_bigendian;
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int host_bigendian;
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int file_long_size;
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int file_page_size;
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struct tep_handle *pevent = NULL;
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int err;
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repipe = __repipe;
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input_fd = fd;
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if (do_read(buf, 3) < 0)
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return -1;
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if (memcmp(buf, test, 3) != 0) {
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pr_debug("no trace data in the file");
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return -1;
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}
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if (do_read(buf, 7) < 0)
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return -1;
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if (memcmp(buf, "tracing", 7) != 0) {
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pr_debug("not a trace file (missing 'tracing' tag)");
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return -1;
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}
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version = read_string();
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if (version == NULL)
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return -1;
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if (show_version)
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printf("version = %s\n", version);
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if (do_read(buf, 1) < 0) {
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free(version);
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return -1;
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}
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file_bigendian = buf[0];
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host_bigendian = bigendian();
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if (trace_event__init(tevent)) {
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pr_debug("trace_event__init failed");
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goto out;
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}
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pevent = tevent->pevent;
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tep_set_flag(pevent, TEP_NSEC_OUTPUT);
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tep_set_file_bigendian(pevent, file_bigendian);
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tep_set_host_bigendian(pevent, host_bigendian);
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if (do_read(buf, 1) < 0)
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goto out;
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file_long_size = buf[0];
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file_page_size = read4(pevent);
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if (!file_page_size)
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goto out;
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tep_set_long_size(pevent, file_long_size);
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tep_set_page_size(pevent, file_page_size);
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err = read_header_files(pevent);
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if (err)
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goto out;
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err = read_ftrace_files(pevent);
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if (err)
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goto out;
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err = read_event_files(pevent);
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if (err)
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goto out;
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err = read_proc_kallsyms(pevent);
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if (err)
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goto out;
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err = read_ftrace_printk(pevent);
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if (err)
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goto out;
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if (atof(version) >= 0.6) {
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err = read_saved_cmdline(pevent);
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if (err)
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goto out;
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}
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size = trace_data_size;
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repipe = false;
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if (show_funcs) {
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tep_print_funcs(pevent);
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} else if (show_printk) {
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tep_print_printk(pevent);
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}
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pevent = NULL;
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out:
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if (pevent)
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trace_event__cleanup(tevent);
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free(version);
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return size;
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}
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