v4.19.13 snapshot.
diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c
new file mode 100644
index 0000000..5eb1b24
--- /dev/null
+++ b/tools/perf/util/trace-event-read.c
@@ -0,0 +1,497 @@
+/*
+ * Copyright (C) 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 <dirent.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 <sys/mman.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "../perf.h"
+#include "util.h"
+#include "trace-event.h"
+#include "debug.h"
+
+static int input_fd;
+
+static ssize_t trace_data_size;
+static bool repipe;
+
+static int __do_read(int fd, void *buf, int size)
+{
+ int rsize = size;
+
+ while (size) {
+ int ret = read(fd, buf, size);
+
+ if (ret <= 0)
+ return -1;
+
+ if (repipe) {
+ int retw = write(STDOUT_FILENO, buf, ret);
+
+ if (retw <= 0 || retw != ret) {
+ pr_debug("repiping input file");
+ return -1;
+ }
+ }
+
+ size -= ret;
+ buf += ret;
+ }
+
+ return rsize;
+}
+
+static int do_read(void *data, int size)
+{
+ int r;
+
+ r = __do_read(input_fd, data, size);
+ if (r <= 0) {
+ pr_debug("reading input file (size expected=%d received=%d)",
+ size, r);
+ return -1;
+ }
+
+ trace_data_size += r;
+
+ return r;
+}
+
+/* If it fails, the next read will report it */
+static void skip(int size)
+{
+ char buf[BUFSIZ];
+ int r;
+
+ while (size) {
+ r = size > BUFSIZ ? BUFSIZ : size;
+ do_read(buf, r);
+ size -= r;
+ };
+}
+
+static unsigned int read4(struct tep_handle *pevent)
+{
+ unsigned int data;
+
+ if (do_read(&data, 4) < 0)
+ return 0;
+ return __data2host4(pevent, data);
+}
+
+static unsigned long long read8(struct tep_handle *pevent)
+{
+ unsigned long long data;
+
+ if (do_read(&data, 8) < 0)
+ return 0;
+ return __data2host8(pevent, data);
+}
+
+static char *read_string(void)
+{
+ char buf[BUFSIZ];
+ char *str = NULL;
+ int size = 0;
+ off_t r;
+ char c;
+
+ for (;;) {
+ r = read(input_fd, &c, 1);
+ if (r < 0) {
+ pr_debug("reading input file");
+ goto out;
+ }
+
+ if (!r) {
+ pr_debug("no data");
+ goto out;
+ }
+
+ if (repipe) {
+ int retw = write(STDOUT_FILENO, &c, 1);
+
+ if (retw <= 0 || retw != r) {
+ pr_debug("repiping input file string");
+ goto out;
+ }
+ }
+
+ buf[size++] = c;
+
+ if (!c)
+ break;
+ }
+
+ trace_data_size += size;
+
+ str = malloc(size);
+ if (str)
+ memcpy(str, buf, size);
+out:
+ return str;
+}
+
+static int read_proc_kallsyms(struct tep_handle *pevent)
+{
+ unsigned int size;
+
+ size = read4(pevent);
+ if (!size)
+ return 0;
+ /*
+ * Just skip it, now that we configure libtraceevent to use the
+ * tools/perf/ symbol resolver.
+ *
+ * We need to skip it so that we can continue parsing old perf.data
+ * files, that contains this /proc/kallsyms payload.
+ *
+ * Newer perf.data files will have just the 4-bytes zeros "kallsyms
+ * payload", so that older tools can continue reading it and interpret
+ * it as "no kallsyms payload is present".
+ */
+ lseek(input_fd, size, SEEK_CUR);
+ trace_data_size += size;
+ return 0;
+}
+
+static int read_ftrace_printk(struct tep_handle *pevent)
+{
+ unsigned int size;
+ char *buf;
+
+ /* it can have 0 size */
+ size = read4(pevent);
+ if (!size)
+ return 0;
+
+ buf = malloc(size + 1);
+ if (buf == NULL)
+ return -1;
+
+ if (do_read(buf, size) < 0) {
+ free(buf);
+ return -1;
+ }
+
+ buf[size] = '\0';
+
+ parse_ftrace_printk(pevent, buf, size);
+
+ free(buf);
+ return 0;
+}
+
+static int read_header_files(struct tep_handle *pevent)
+{
+ unsigned long long size;
+ char *header_page;
+ char buf[BUFSIZ];
+ int ret = 0;
+
+ if (do_read(buf, 12) < 0)
+ return -1;
+
+ if (memcmp(buf, "header_page", 12) != 0) {
+ pr_debug("did not read header page");
+ return -1;
+ }
+
+ size = read8(pevent);
+
+ header_page = malloc(size);
+ if (header_page == NULL)
+ return -1;
+
+ if (do_read(header_page, size) < 0) {
+ pr_debug("did not read header page");
+ free(header_page);
+ return -1;
+ }
+
+ if (!tep_parse_header_page(pevent, header_page, size,
+ tep_get_long_size(pevent))) {
+ /*
+ * The commit field in the page is of type long,
+ * use that instead, since it represents the kernel.
+ */
+ tep_set_long_size(pevent, pevent->header_page_size_size);
+ }
+ free(header_page);
+
+ if (do_read(buf, 13) < 0)
+ return -1;
+
+ if (memcmp(buf, "header_event", 13) != 0) {
+ pr_debug("did not read header event");
+ return -1;
+ }
+
+ size = read8(pevent);
+ skip(size);
+
+ return ret;
+}
+
+static int read_ftrace_file(struct tep_handle *pevent, unsigned long long size)
+{
+ int ret;
+ char *buf;
+
+ buf = malloc(size);
+ if (buf == NULL) {
+ pr_debug("memory allocation failure\n");
+ return -1;
+ }
+
+ ret = do_read(buf, size);
+ if (ret < 0) {
+ pr_debug("error reading ftrace file.\n");
+ goto out;
+ }
+
+ ret = parse_ftrace_file(pevent, buf, size);
+ if (ret < 0)
+ pr_debug("error parsing ftrace file.\n");
+out:
+ free(buf);
+ return ret;
+}
+
+static int read_event_file(struct tep_handle *pevent, char *sys,
+ unsigned long long size)
+{
+ int ret;
+ char *buf;
+
+ buf = malloc(size);
+ if (buf == NULL) {
+ pr_debug("memory allocation failure\n");
+ return -1;
+ }
+
+ ret = do_read(buf, size);
+ if (ret < 0) {
+ free(buf);
+ goto out;
+ }
+
+ ret = parse_event_file(pevent, buf, size, sys);
+ if (ret < 0)
+ pr_debug("error parsing event file.\n");
+out:
+ free(buf);
+ return ret;
+}
+
+static int read_ftrace_files(struct tep_handle *pevent)
+{
+ unsigned long long size;
+ int count;
+ int i;
+ int ret;
+
+ count = read4(pevent);
+
+ for (i = 0; i < count; i++) {
+ size = read8(pevent);
+ ret = read_ftrace_file(pevent, size);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static int read_event_files(struct tep_handle *pevent)
+{
+ unsigned long long size;
+ char *sys;
+ int systems;
+ int count;
+ int i,x;
+ int ret;
+
+ systems = read4(pevent);
+
+ for (i = 0; i < systems; i++) {
+ sys = read_string();
+ if (sys == NULL)
+ return -1;
+
+ count = read4(pevent);
+
+ for (x=0; x < count; x++) {
+ size = read8(pevent);
+ ret = read_event_file(pevent, sys, size);
+ if (ret) {
+ free(sys);
+ return ret;
+ }
+ }
+ free(sys);
+ }
+ return 0;
+}
+
+static int read_saved_cmdline(struct tep_handle *pevent)
+{
+ unsigned long long size;
+ char *buf;
+ int ret;
+
+ /* it can have 0 size */
+ size = read8(pevent);
+ if (!size)
+ return 0;
+
+ buf = malloc(size + 1);
+ if (buf == NULL) {
+ pr_debug("memory allocation failure\n");
+ return -1;
+ }
+
+ ret = do_read(buf, size);
+ if (ret < 0) {
+ pr_debug("error reading saved cmdlines\n");
+ goto out;
+ }
+
+ parse_saved_cmdline(pevent, buf, size);
+ ret = 0;
+out:
+ free(buf);
+ return ret;
+}
+
+ssize_t trace_report(int fd, struct trace_event *tevent, bool __repipe)
+{
+ char buf[BUFSIZ];
+ char test[] = { 23, 8, 68 };
+ char *version;
+ int show_version = 0;
+ int show_funcs = 0;
+ int show_printk = 0;
+ ssize_t size = -1;
+ int file_bigendian;
+ int host_bigendian;
+ int file_long_size;
+ int file_page_size;
+ struct tep_handle *pevent = NULL;
+ int err;
+
+ repipe = __repipe;
+ input_fd = fd;
+
+ if (do_read(buf, 3) < 0)
+ return -1;
+ if (memcmp(buf, test, 3) != 0) {
+ pr_debug("no trace data in the file");
+ return -1;
+ }
+
+ if (do_read(buf, 7) < 0)
+ return -1;
+ if (memcmp(buf, "tracing", 7) != 0) {
+ pr_debug("not a trace file (missing 'tracing' tag)");
+ return -1;
+ }
+
+ version = read_string();
+ if (version == NULL)
+ return -1;
+ if (show_version)
+ printf("version = %s\n", version);
+
+ if (do_read(buf, 1) < 0) {
+ free(version);
+ return -1;
+ }
+ file_bigendian = buf[0];
+ host_bigendian = bigendian();
+
+ if (trace_event__init(tevent)) {
+ pr_debug("trace_event__init failed");
+ goto out;
+ }
+
+ pevent = tevent->pevent;
+
+ tep_set_flag(pevent, TEP_NSEC_OUTPUT);
+ tep_set_file_bigendian(pevent, file_bigendian);
+ tep_set_host_bigendian(pevent, host_bigendian);
+
+ if (do_read(buf, 1) < 0)
+ goto out;
+ file_long_size = buf[0];
+
+ file_page_size = read4(pevent);
+ if (!file_page_size)
+ goto out;
+
+ tep_set_long_size(pevent, file_long_size);
+ tep_set_page_size(pevent, file_page_size);
+
+ err = read_header_files(pevent);
+ if (err)
+ goto out;
+ err = read_ftrace_files(pevent);
+ if (err)
+ goto out;
+ err = read_event_files(pevent);
+ if (err)
+ goto out;
+ err = read_proc_kallsyms(pevent);
+ if (err)
+ goto out;
+ err = read_ftrace_printk(pevent);
+ if (err)
+ goto out;
+ if (atof(version) >= 0.6) {
+ err = read_saved_cmdline(pevent);
+ if (err)
+ goto out;
+ }
+
+ size = trace_data_size;
+ repipe = false;
+
+ if (show_funcs) {
+ tep_print_funcs(pevent);
+ } else if (show_printk) {
+ tep_print_printk(pevent);
+ }
+
+ pevent = NULL;
+
+out:
+ if (pevent)
+ trace_event__cleanup(tevent);
+ free(version);
+ return size;
+}