tracing: Add new trace_marker_raw

A new file is created:

 /sys/kernel/debug/tracing/trace_marker_raw

This allows for appications to create data structures and write the binary
data directly into it, and then read the trace data out from trace_pipe_raw
into the same type of data structure. This saves on converting numbers into
ASCII that would be required by trace_marker.

Suggested-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 3fc20422c166..5d33a7352919 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -1288,6 +1288,35 @@ static struct trace_event trace_print_event = {
         .funcs          = &trace_print_funcs,
 };
 
+static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
+                                         struct trace_event *event)
+{
+        struct raw_data_entry *field;
+        int i;
+
+        trace_assign_type(field, iter->ent);
+
+        trace_seq_printf(&iter->seq, "# %x buf:", field->id);
+
+        for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
+                trace_seq_printf(&iter->seq, " %02x",
+                                 (unsigned char)field->buf[i]);
+
+        trace_seq_putc(&iter->seq, '\n');
+
+        return trace_handle_return(&iter->seq);
+}
+
+static struct trace_event_functions trace_raw_data_funcs = {
+        .trace          = trace_raw_data,
+        .raw            = trace_raw_data,
+};
+
+static struct trace_event trace_raw_data_event = {
+        .type           = TRACE_RAW_DATA,
+        .funcs          = &trace_raw_data_funcs,
+};
+
 
 static struct trace_event *events[] __initdata = {
         &trace_fn_event,
@@ -1299,6 +1328,7 @@ static struct trace_event *events[] __initdata = {
         &trace_bprint_event,
         &trace_print_event,
         &trace_hwlat_event,
+        &trace_raw_data_event,
         NULL
 };