v4.19.13 snapshot.
diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
new file mode 100644
index 0000000..8ad8e75
--- /dev/null
+++ b/tools/perf/util/trace-event-info.c
@@ -0,0 +1,618 @@
+/*
+ * Copyright (C) 2008,2009, Steven Rostedt <srostedt@redhat.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License (not later!)
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#include "util.h"
+#include <dirent.h>
+#include <mntent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <linux/list.h>
+#include <linux/kernel.h>
+
+#include "../perf.h"
+#include "trace-event.h"
+#include <api/fs/tracing_path.h>
+#include "evsel.h"
+#include "debug.h"
+
+#define VERSION "0.6"
+
+static int output_fd;
+
+
+int bigendian(void)
+{
+ unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
+ unsigned int *ptr;
+
+ ptr = (unsigned int *)(void *)str;
+ return *ptr == 0x01020304;
+}
+
+/* unfortunately, you can not stat debugfs or proc files for size */
+static int record_file(const char *file, ssize_t hdr_sz)
+{
+ unsigned long long size = 0;
+ char buf[BUFSIZ], *sizep;
+ off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
+ int r, fd;
+ int err = -EIO;
+
+ fd = open(file, O_RDONLY);
+ if (fd < 0) {
+ pr_debug("Can't read '%s'", file);
+ return -errno;
+ }
+
+ /* put in zeros for file size, then fill true size later */
+ if (hdr_sz) {
+ if (write(output_fd, &size, hdr_sz) != hdr_sz)
+ goto out;
+ }
+
+ do {
+ r = read(fd, buf, BUFSIZ);
+ if (r > 0) {
+ size += r;
+ if (write(output_fd, buf, r) != r)
+ goto out;
+ }
+ } while (r > 0);
+
+ /* ugh, handle big-endian hdr_size == 4 */
+ sizep = (char*)&size;
+ if (bigendian())
+ sizep += sizeof(u64) - hdr_sz;
+
+ if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0) {
+ pr_debug("writing file size failed\n");
+ goto out;
+ }
+
+ err = 0;
+out:
+ close(fd);
+ return err;
+}
+
+static int record_header_files(void)
+{
+ char *path = get_events_file("header_page");
+ struct stat st;
+ int err = -EIO;
+
+ if (!path) {
+ pr_debug("can't get tracing/events/header_page");
+ return -ENOMEM;
+ }
+
+ if (stat(path, &st) < 0) {
+ pr_debug("can't read '%s'", path);
+ goto out;
+ }
+
+ if (write(output_fd, "header_page", 12) != 12) {
+ pr_debug("can't write header_page\n");
+ goto out;
+ }
+
+ if (record_file(path, 8) < 0) {
+ pr_debug("can't record header_page file\n");
+ goto out;
+ }
+
+ put_events_file(path);
+
+ path = get_events_file("header_event");
+ if (!path) {
+ pr_debug("can't get tracing/events/header_event");
+ err = -ENOMEM;
+ goto out;
+ }
+
+ if (stat(path, &st) < 0) {
+ pr_debug("can't read '%s'", path);
+ goto out;
+ }
+
+ if (write(output_fd, "header_event", 13) != 13) {
+ pr_debug("can't write header_event\n");
+ goto out;
+ }
+
+ if (record_file(path, 8) < 0) {
+ pr_debug("can't record header_event file\n");
+ goto out;
+ }
+
+ err = 0;
+out:
+ put_events_file(path);
+ return err;
+}
+
+static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
+{
+ while (tps) {
+ if (!strcmp(sys, tps->name))
+ return true;
+ tps = tps->next;
+ }
+
+ return false;
+}
+
+#define for_each_event(dir, dent, tps) \
+ while ((dent = readdir(dir))) \
+ if (dent->d_type == DT_DIR && \
+ (strcmp(dent->d_name, ".")) && \
+ (strcmp(dent->d_name, ".."))) \
+
+static int copy_event_system(const char *sys, struct tracepoint_path *tps)
+{
+ struct dirent *dent;
+ struct stat st;
+ char *format;
+ DIR *dir;
+ int count = 0;
+ int ret;
+ int err;
+
+ dir = opendir(sys);
+ if (!dir) {
+ pr_debug("can't read directory '%s'", sys);
+ return -errno;
+ }
+
+ for_each_event(dir, dent, tps) {
+ if (!name_in_tp_list(dent->d_name, tps))
+ continue;
+
+ if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
+ err = -ENOMEM;
+ goto out;
+ }
+ ret = stat(format, &st);
+ free(format);
+ if (ret < 0)
+ continue;
+ count++;
+ }
+
+ if (write(output_fd, &count, 4) != 4) {
+ err = -EIO;
+ pr_debug("can't write count\n");
+ goto out;
+ }
+
+ rewinddir(dir);
+ for_each_event(dir, dent, tps) {
+ if (!name_in_tp_list(dent->d_name, tps))
+ continue;
+
+ if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
+ err = -ENOMEM;
+ goto out;
+ }
+ ret = stat(format, &st);
+
+ if (ret >= 0) {
+ err = record_file(format, 8);
+ if (err) {
+ free(format);
+ goto out;
+ }
+ }
+ free(format);
+ }
+ err = 0;
+out:
+ closedir(dir);
+ return err;
+}
+
+static int record_ftrace_files(struct tracepoint_path *tps)
+{
+ char *path;
+ int ret;
+
+ path = get_events_file("ftrace");
+ if (!path) {
+ pr_debug("can't get tracing/events/ftrace");
+ return -ENOMEM;
+ }
+
+ ret = copy_event_system(path, tps);
+
+ put_tracing_file(path);
+
+ return ret;
+}
+
+static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
+{
+ while (tps) {
+ if (!strcmp(sys, tps->system))
+ return true;
+ tps = tps->next;
+ }
+
+ return false;
+}
+
+static int record_event_files(struct tracepoint_path *tps)
+{
+ struct dirent *dent;
+ struct stat st;
+ char *path;
+ char *sys;
+ DIR *dir;
+ int count = 0;
+ int ret;
+ int err;
+
+ path = get_tracing_file("events");
+ if (!path) {
+ pr_debug("can't get tracing/events");
+ return -ENOMEM;
+ }
+
+ dir = opendir(path);
+ if (!dir) {
+ err = -errno;
+ pr_debug("can't read directory '%s'", path);
+ goto out;
+ }
+
+ for_each_event(dir, dent, tps) {
+ if (strcmp(dent->d_name, "ftrace") == 0 ||
+ !system_in_tp_list(dent->d_name, tps))
+ continue;
+
+ count++;
+ }
+
+ if (write(output_fd, &count, 4) != 4) {
+ err = -EIO;
+ pr_debug("can't write count\n");
+ goto out;
+ }
+
+ rewinddir(dir);
+ for_each_event(dir, dent, tps) {
+ if (strcmp(dent->d_name, "ftrace") == 0 ||
+ !system_in_tp_list(dent->d_name, tps))
+ continue;
+
+ if (asprintf(&sys, "%s/%s", path, dent->d_name) < 0) {
+ err = -ENOMEM;
+ goto out;
+ }
+ ret = stat(sys, &st);
+ if (ret >= 0) {
+ ssize_t size = strlen(dent->d_name) + 1;
+
+ if (write(output_fd, dent->d_name, size) != size ||
+ copy_event_system(sys, tps) < 0) {
+ err = -EIO;
+ free(sys);
+ goto out;
+ }
+ }
+ free(sys);
+ }
+ err = 0;
+out:
+ closedir(dir);
+ put_tracing_file(path);
+
+ return err;
+}
+
+static int record_proc_kallsyms(void)
+{
+ unsigned long long size = 0;
+ /*
+ * Just to keep older perf.data file parsers happy, record a zero
+ * sized kallsyms file, i.e. do the same thing that was done when
+ * /proc/kallsyms (or something specified via --kallsyms, in a
+ * different path) couldn't be read.
+ */
+ return write(output_fd, &size, 4) != 4 ? -EIO : 0;
+}
+
+static int record_ftrace_printk(void)
+{
+ unsigned int size;
+ char *path;
+ struct stat st;
+ int ret, err = 0;
+
+ path = get_tracing_file("printk_formats");
+ if (!path) {
+ pr_debug("can't get tracing/printk_formats");
+ return -ENOMEM;
+ }
+
+ ret = stat(path, &st);
+ if (ret < 0) {
+ /* not found */
+ size = 0;
+ if (write(output_fd, &size, 4) != 4)
+ err = -EIO;
+ goto out;
+ }
+ err = record_file(path, 4);
+
+out:
+ put_tracing_file(path);
+ return err;
+}
+
+static int record_saved_cmdline(void)
+{
+ unsigned long long size;
+ char *path;
+ struct stat st;
+ int ret, err = 0;
+
+ path = get_tracing_file("saved_cmdlines");
+ if (!path) {
+ pr_debug("can't get tracing/saved_cmdline");
+ return -ENOMEM;
+ }
+
+ ret = stat(path, &st);
+ if (ret < 0) {
+ /* not found */
+ size = 0;
+ if (write(output_fd, &size, 8) != 8)
+ err = -EIO;
+ goto out;
+ }
+ err = record_file(path, 8);
+
+out:
+ put_tracing_file(path);
+ return err;
+}
+
+static void
+put_tracepoints_path(struct tracepoint_path *tps)
+{
+ while (tps) {
+ struct tracepoint_path *t = tps;
+
+ tps = tps->next;
+ zfree(&t->name);
+ zfree(&t->system);
+ free(t);
+ }
+}
+
+static struct tracepoint_path *
+get_tracepoints_path(struct list_head *pattrs)
+{
+ struct tracepoint_path path, *ppath = &path;
+ struct perf_evsel *pos;
+ int nr_tracepoints = 0;
+
+ list_for_each_entry(pos, pattrs, node) {
+ if (pos->attr.type != PERF_TYPE_TRACEPOINT)
+ continue;
+ ++nr_tracepoints;
+
+ if (pos->name) {
+ ppath->next = tracepoint_name_to_path(pos->name);
+ if (ppath->next)
+ goto next;
+
+ if (strchr(pos->name, ':') == NULL)
+ goto try_id;
+
+ goto error;
+ }
+
+try_id:
+ ppath->next = tracepoint_id_to_path(pos->attr.config);
+ if (!ppath->next) {
+error:
+ pr_debug("No memory to alloc tracepoints list\n");
+ put_tracepoints_path(&path);
+ return NULL;
+ }
+next:
+ ppath = ppath->next;
+ }
+
+ return nr_tracepoints > 0 ? path.next : NULL;
+}
+
+bool have_tracepoints(struct list_head *pattrs)
+{
+ struct perf_evsel *pos;
+
+ list_for_each_entry(pos, pattrs, node)
+ if (pos->attr.type == PERF_TYPE_TRACEPOINT)
+ return true;
+
+ return false;
+}
+
+static int tracing_data_header(void)
+{
+ char buf[20];
+ ssize_t size;
+
+ /* just guessing this is someone's birthday.. ;) */
+ buf[0] = 23;
+ 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 (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;
+}