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![Yang Jihong](/assets/img/avatar_default.png)
Add tracepoint_id_to_name() helper to search for the trace events directory by given event id and return the corresponding tracepoint. Signed-off-by: Yang Jihong <yangjihong1@huawei.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Cc: anshuman.khandual@arm.com Cc: mark.rutland@arm.com Cc: irogers@google.com Cc: jesussanp@google.com Cc: peterz@infradead.org Cc: acme@kernel.org Cc: jolsa@kernel.org Cc: alexander.shishkin@linux.intel.com Cc: mingo@redhat.com Link: https://lore.kernel.org/r/20230623054416.160858-2-yangjihong1@huawei.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>
702 lines
13 KiB
C
702 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2008,2009, Steven Rostedt <srostedt@redhat.com>
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*/
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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 <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 <linux/zalloc.h>
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#include <internal/lib.h> // page_size
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#include <sys/param.h>
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#include "trace-event.h"
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#include "tracepoint.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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#include "util.h"
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#define VERSION "0.6"
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#define MAX_EVENT_LENGTH 512
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static int output_fd;
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struct tracepoint_path {
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char *system;
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char *name;
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struct tracepoint_path *next;
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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 (host_is_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 = get_events_file("header_page");
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struct stat st;
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int err = -EIO;
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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_events_file(path);
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path = get_events_file("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_events_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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#define for_each_event_tps(dir, dent, tps) \
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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, ".")) && \
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(strcmp(dent->d_name, ".."))) \
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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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for_each_event_tps(dir, dent, tps) {
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if (!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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for_each_event_tps(dir, dent, tps) {
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if (!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_events_file("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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for_each_event_tps(dir, dent, tps) {
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if (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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for_each_event_tps(dir, dent, tps) {
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if (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 int record_saved_cmdline(void)
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{
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unsigned long long 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("saved_cmdlines");
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if (!path) {
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pr_debug("can't get tracing/saved_cmdline");
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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, 8) != 8)
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err = -EIO;
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goto out;
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}
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err = record_file(path, 8);
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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 *tracepoint_id_to_path(u64 config)
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{
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struct tracepoint_path *path = NULL;
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DIR *sys_dir, *evt_dir;
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struct dirent *sys_dirent, *evt_dirent;
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char id_buf[24];
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int fd;
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u64 id;
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char evt_path[MAXPATHLEN];
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char *dir_path;
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sys_dir = tracing_events__opendir();
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if (!sys_dir)
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return NULL;
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for_each_subsystem(sys_dir, sys_dirent) {
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dir_path = get_events_file(sys_dirent->d_name);
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if (!dir_path)
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continue;
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evt_dir = opendir(dir_path);
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if (!evt_dir)
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goto next;
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for_each_event(dir_path, evt_dir, evt_dirent) {
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scnprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
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evt_dirent->d_name);
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fd = open(evt_path, O_RDONLY);
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if (fd < 0)
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continue;
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if (read(fd, id_buf, sizeof(id_buf)) < 0) {
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close(fd);
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continue;
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}
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close(fd);
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id = atoll(id_buf);
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if (id == config) {
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put_events_file(dir_path);
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closedir(evt_dir);
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closedir(sys_dir);
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path = zalloc(sizeof(*path));
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if (!path)
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return NULL;
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if (asprintf(&path->system, "%.*s",
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MAX_EVENT_LENGTH, sys_dirent->d_name) < 0) {
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free(path);
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return NULL;
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}
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if (asprintf(&path->name, "%.*s",
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MAX_EVENT_LENGTH, evt_dirent->d_name) < 0) {
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zfree(&path->system);
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free(path);
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return NULL;
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}
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return path;
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}
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}
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closedir(evt_dir);
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next:
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put_events_file(dir_path);
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}
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closedir(sys_dir);
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return NULL;
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}
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char *tracepoint_id_to_name(u64 config)
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{
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struct tracepoint_path *path = tracepoint_id_to_path(config);
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char *buf = NULL;
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if (path && asprintf(&buf, "%s:%s", path->system, path->name) < 0)
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buf = NULL;
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put_tracepoints_path(path);
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return buf;
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}
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static struct tracepoint_path *tracepoint_name_to_path(const char *name)
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{
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struct tracepoint_path *path = zalloc(sizeof(*path));
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char *str = strchr(name, ':');
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if (path == NULL || str == NULL) {
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free(path);
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return NULL;
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}
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path->system = strndup(name, str - name);
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path->name = strdup(str+1);
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if (path->system == NULL || path->name == NULL) {
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zfree(&path->system);
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zfree(&path->name);
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zfree(&path);
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}
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return path;
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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 evsel *pos;
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int nr_tracepoints = 0;
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list_for_each_entry(pos, pattrs, core.node) {
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if (pos->core.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->core.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.next);
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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 evsel *pos;
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list_for_each_entry(pos, pattrs, core.node)
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if (pos->core.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;
|
|
buf[2] = 68;
|
|
memcpy(buf + 3, "tracing", 7);
|
|
|
|
if (write(output_fd, buf, 10) != 10)
|
|
return -1;
|
|
|
|
size = strlen(VERSION) + 1;
|
|
if (write(output_fd, VERSION, size) != size)
|
|
return -1;
|
|
|
|
/* save endian */
|
|
if (host_is_bigendian())
|
|
buf[0] = 1;
|
|
else
|
|
buf[0] = 0;
|
|
|
|
if (write(output_fd, buf, 1) != 1)
|
|
return -1;
|
|
|
|
/* save size of long */
|
|
buf[0] = sizeof(long);
|
|
if (write(output_fd, buf, 1) != 1)
|
|
return -1;
|
|
|
|
/* save page_size */
|
|
if (write(output_fd, &page_size, 4) != 4)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct tracing_data *tracing_data_get(struct list_head *pattrs,
|
|
int fd, bool temp)
|
|
{
|
|
struct tracepoint_path *tps;
|
|
struct tracing_data *tdata;
|
|
int err;
|
|
|
|
output_fd = fd;
|
|
|
|
tps = get_tracepoints_path(pattrs);
|
|
if (!tps)
|
|
return NULL;
|
|
|
|
tdata = malloc(sizeof(*tdata));
|
|
if (!tdata)
|
|
return NULL;
|
|
|
|
tdata->temp = temp;
|
|
tdata->size = 0;
|
|
|
|
if (temp) {
|
|
int temp_fd;
|
|
|
|
snprintf(tdata->temp_file, sizeof(tdata->temp_file),
|
|
"/tmp/perf-XXXXXX");
|
|
if (!mkstemp(tdata->temp_file)) {
|
|
pr_debug("Can't make temp file");
|
|
free(tdata);
|
|
return NULL;
|
|
}
|
|
|
|
temp_fd = open(tdata->temp_file, O_RDWR);
|
|
if (temp_fd < 0) {
|
|
pr_debug("Can't read '%s'", tdata->temp_file);
|
|
free(tdata);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Set the temp file the default output, so all the
|
|
* tracing data are stored into it.
|
|
*/
|
|
output_fd = temp_fd;
|
|
}
|
|
|
|
err = tracing_data_header();
|
|
if (err)
|
|
goto out;
|
|
err = record_header_files();
|
|
if (err)
|
|
goto out;
|
|
err = record_ftrace_files(tps);
|
|
if (err)
|
|
goto out;
|
|
err = record_event_files(tps);
|
|
if (err)
|
|
goto out;
|
|
err = record_proc_kallsyms();
|
|
if (err)
|
|
goto out;
|
|
err = record_ftrace_printk();
|
|
if (err)
|
|
goto out;
|
|
err = record_saved_cmdline();
|
|
|
|
out:
|
|
/*
|
|
* All tracing data are stored by now, we can restore
|
|
* the default output file in case we used temp file.
|
|
*/
|
|
if (temp) {
|
|
tdata->size = lseek(output_fd, 0, SEEK_CUR);
|
|
close(output_fd);
|
|
output_fd = fd;
|
|
}
|
|
|
|
if (err)
|
|
zfree(&tdata);
|
|
|
|
put_tracepoints_path(tps);
|
|
return tdata;
|
|
}
|
|
|
|
int tracing_data_put(struct tracing_data *tdata)
|
|
{
|
|
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;
|
|
}
|