![Jiri Olsa](/assets/img/avatar_default.png)
Moving tracing_path interface into api/fs/tracing_path.c out of util.c. It seems generic enough to be used by others, and I couldn't think of better place. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Reviewed-by: Matt Fleming <matt.fleming@intel.com> Reviewed-by: Raphael Beamonte <raphael.beamonte@gmail.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/1441180605-24737-5-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
590 lines
11 KiB
C
590 lines
11 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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#include "util.h"
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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 <errno.h>
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#include <stdbool.h>
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#include <linux/list.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 <api/fs/tracing_path.h>
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#include "evsel.h"
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#include "debug.h"
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#define VERSION "0.5"
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static int output_fd;
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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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/* unfortunately, you can not stat debugfs or proc files for size */
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static int record_file(const char *file, ssize_t hdr_sz)
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{
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unsigned long long size = 0;
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char buf[BUFSIZ], *sizep;
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off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
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int r, fd;
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int err = -EIO;
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fd = open(file, O_RDONLY);
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if (fd < 0) {
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pr_debug("Can't read '%s'", file);
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return -errno;
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}
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/* put in zeros for file size, then fill true size later */
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if (hdr_sz) {
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if (write(output_fd, &size, hdr_sz) != hdr_sz)
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goto out;
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}
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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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if (write(output_fd, buf, r) != r)
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goto out;
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}
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} while (r > 0);
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/* ugh, handle big-endian hdr_size == 4 */
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sizep = (char*)&size;
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if (bigendian())
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sizep += sizeof(u64) - hdr_sz;
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if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0) {
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pr_debug("writing file size failed\n");
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goto out;
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}
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err = 0;
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out:
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close(fd);
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return err;
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}
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static int record_header_files(void)
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{
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char *path;
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struct stat st;
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int err = -EIO;
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path = get_tracing_file("events/header_page");
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if (!path) {
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pr_debug("can't get tracing/events/header_page");
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return -ENOMEM;
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}
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if (stat(path, &st) < 0) {
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pr_debug("can't read '%s'", path);
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goto out;
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}
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if (write(output_fd, "header_page", 12) != 12) {
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pr_debug("can't write header_page\n");
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goto out;
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}
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if (record_file(path, 8) < 0) {
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pr_debug("can't record header_page file\n");
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goto out;
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}
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put_tracing_file(path);
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path = get_tracing_file("events/header_event");
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if (!path) {
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pr_debug("can't get tracing/events/header_event");
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err = -ENOMEM;
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goto out;
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}
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if (stat(path, &st) < 0) {
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pr_debug("can't read '%s'", path);
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goto out;
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}
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if (write(output_fd, "header_event", 13) != 13) {
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pr_debug("can't write header_event\n");
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goto out;
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}
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if (record_file(path, 8) < 0) {
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pr_debug("can't record header_event file\n");
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goto out;
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}
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err = 0;
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out:
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put_tracing_file(path);
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return err;
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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 int copy_event_system(const char *sys, 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 *format;
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DIR *dir;
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int count = 0;
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int ret;
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int err;
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dir = opendir(sys);
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if (!dir) {
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pr_debug("can't read directory '%s'", sys);
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return -errno;
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}
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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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if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
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err = -ENOMEM;
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goto out;
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}
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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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if (write(output_fd, &count, 4) != 4) {
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err = -EIO;
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pr_debug("can't write count\n");
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goto out;
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}
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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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if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
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err = -ENOMEM;
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goto out;
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}
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ret = stat(format, &st);
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if (ret >= 0) {
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err = record_file(format, 8);
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if (err) {
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free(format);
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goto out;
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}
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}
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free(format);
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}
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err = 0;
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out:
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closedir(dir);
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return err;
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}
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static int record_ftrace_files(struct tracepoint_path *tps)
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{
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char *path;
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int ret;
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path = get_tracing_file("events/ftrace");
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if (!path) {
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pr_debug("can't get tracing/events/ftrace");
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return -ENOMEM;
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}
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ret = copy_event_system(path, tps);
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put_tracing_file(path);
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return ret;
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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 int record_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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int err;
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path = get_tracing_file("events");
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if (!path) {
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pr_debug("can't get tracing/events");
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return -ENOMEM;
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}
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dir = opendir(path);
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if (!dir) {
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err = -errno;
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pr_debug("can't read directory '%s'", path);
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goto out;
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}
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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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if (write(output_fd, &count, 4) != 4) {
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err = -EIO;
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pr_debug("can't write count\n");
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goto out;
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}
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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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if (asprintf(&sys, "%s/%s", path, dent->d_name) < 0) {
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err = -ENOMEM;
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goto out;
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}
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ret = stat(sys, &st);
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if (ret >= 0) {
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ssize_t size = strlen(dent->d_name) + 1;
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if (write(output_fd, dent->d_name, size) != size ||
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copy_event_system(sys, tps) < 0) {
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err = -EIO;
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free(sys);
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goto out;
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}
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}
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free(sys);
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}
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err = 0;
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out:
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closedir(dir);
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put_tracing_file(path);
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return err;
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}
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static int record_proc_kallsyms(void)
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{
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unsigned long long size = 0;
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/*
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* Just to keep older perf.data file parsers happy, record a zero
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* sized kallsyms file, i.e. do the same thing that was done when
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* /proc/kallsyms (or something specified via --kallsyms, in a
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* different path) couldn't be read.
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*/
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return write(output_fd, &size, 4) != 4 ? -EIO : 0;
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}
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static int record_ftrace_printk(void)
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{
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unsigned int size;
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char *path;
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struct stat st;
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int ret, err = 0;
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path = get_tracing_file("printk_formats");
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if (!path) {
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pr_debug("can't get tracing/printk_formats");
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return -ENOMEM;
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}
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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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if (write(output_fd, &size, 4) != 4)
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err = -EIO;
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goto out;
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}
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err = record_file(path, 4);
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out:
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put_tracing_file(path);
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return err;
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}
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static void
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put_tracepoints_path(struct tracepoint_path *tps)
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{
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while (tps) {
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struct tracepoint_path *t = tps;
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tps = tps->next;
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zfree(&t->name);
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zfree(&t->system);
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free(t);
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}
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}
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static struct tracepoint_path *
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get_tracepoints_path(struct list_head *pattrs)
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{
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struct tracepoint_path path, *ppath = &path;
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struct perf_evsel *pos;
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int nr_tracepoints = 0;
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list_for_each_entry(pos, pattrs, node) {
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if (pos->attr.type != PERF_TYPE_TRACEPOINT)
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continue;
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++nr_tracepoints;
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if (pos->name) {
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ppath->next = tracepoint_name_to_path(pos->name);
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if (ppath->next)
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goto next;
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if (strchr(pos->name, ':') == NULL)
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goto try_id;
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goto error;
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}
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try_id:
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ppath->next = tracepoint_id_to_path(pos->attr.config);
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if (!ppath->next) {
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error:
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pr_debug("No memory to alloc tracepoints list\n");
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put_tracepoints_path(&path);
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return NULL;
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}
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next:
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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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bool have_tracepoints(struct list_head *pattrs)
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{
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struct perf_evsel *pos;
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list_for_each_entry(pos, pattrs, node)
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if (pos->attr.type == PERF_TYPE_TRACEPOINT)
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return true;
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return false;
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}
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static int tracing_data_header(void)
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{
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char buf[20];
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ssize_t size;
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/* just guessing this is someone's birthday.. ;) */
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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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if (write(output_fd, buf, 10) != 10)
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return -1;
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size = strlen(VERSION) + 1;
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if (write(output_fd, VERSION, size) != size)
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return -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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if (write(output_fd, buf, 1) != 1)
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return -1;
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/* save size of long */
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buf[0] = sizeof(long);
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if (write(output_fd, buf, 1) != 1)
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return -1;
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/* save page_size */
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if (write(output_fd, &page_size, 4) != 4)
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return -1;
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return 0;
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}
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struct tracing_data *tracing_data_get(struct list_head *pattrs,
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int fd, bool temp)
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{
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struct tracepoint_path *tps;
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struct tracing_data *tdata;
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int err;
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output_fd = fd;
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tps = get_tracepoints_path(pattrs);
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if (!tps)
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return NULL;
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tdata = malloc(sizeof(*tdata));
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if (!tdata)
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return NULL;
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tdata->temp = temp;
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tdata->size = 0;
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if (temp) {
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int temp_fd;
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snprintf(tdata->temp_file, sizeof(tdata->temp_file),
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"/tmp/perf-XXXXXX");
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if (!mkstemp(tdata->temp_file)) {
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pr_debug("Can't make temp file");
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return NULL;
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}
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temp_fd = open(tdata->temp_file, O_RDWR);
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if (temp_fd < 0) {
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pr_debug("Can't read '%s'", tdata->temp_file);
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return NULL;
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}
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/*
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* Set the temp file the default output, so all the
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* tracing data are stored into it.
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*/
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output_fd = temp_fd;
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}
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err = tracing_data_header();
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if (err)
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goto out;
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err = record_header_files();
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if (err)
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goto out;
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err = record_ftrace_files(tps);
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if (err)
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goto out;
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err = record_event_files(tps);
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if (err)
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goto out;
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err = record_proc_kallsyms();
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if (err)
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goto out;
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err = record_ftrace_printk();
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out:
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/*
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* All tracing data are stored by now, we can restore
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* the default output file in case we used temp file.
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*/
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if (temp) {
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tdata->size = lseek(output_fd, 0, SEEK_CUR);
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close(output_fd);
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output_fd = fd;
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}
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if (err)
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zfree(&tdata);
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put_tracepoints_path(tps);
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return tdata;
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}
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int tracing_data_put(struct tracing_data *tdata)
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{
|
|
int err = 0;
|
|
|
|
if (tdata->temp) {
|
|
err = record_file(tdata->temp_file, 0);
|
|
unlink(tdata->temp_file);
|
|
}
|
|
|
|
free(tdata);
|
|
return err;
|
|
}
|
|
|
|
int read_tracing_data(int fd, struct list_head *pattrs)
|
|
{
|
|
int err;
|
|
struct tracing_data *tdata;
|
|
|
|
/*
|
|
* We work over the real file, so we can write data
|
|
* directly, no temp file is needed.
|
|
*/
|
|
tdata = tracing_data_get(pattrs, fd, false);
|
|
if (!tdata)
|
|
return -ENOMEM;
|
|
|
|
err = tracing_data_put(tdata);
|
|
return err;
|
|
}
|