[PATCH v2 13/15] tools lib traceevent: Add builtin handler for trace_marker_raw

From: Steven Rostedt
Date: Thu Jul 02 2020 - 14:57:55 EST


From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>

When something is written into trace_marker_raw, it goes in as a binary. But
the printk_fmt() of the event that is created (raw_data)'s format file only
prints the first byte of data:

print fmt: "id:%04x %08x", REC->id, (int)REC->buf[0]

This is not very useful if we want to see the full data output.

Implement the processing of the raw_data event like it is in the kernel.

Link: http://lore.kernel.org/linux-trace-devel/20200702174950.123454-5-tz.stoyanov@xxxxxxxxx

Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
[ Ported from trace-cmd.git ]
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
---
.../lib/traceevent/plugins/plugin_function.c | 41 +++++++++++++++++++
1 file changed, 41 insertions(+)

diff --git a/tools/lib/traceevent/plugins/plugin_function.c b/tools/lib/traceevent/plugins/plugin_function.c
index c7d321968f39..7e8e29b43d1c 100644
--- a/tools/lib/traceevent/plugins/plugin_function.c
+++ b/tools/lib/traceevent/plugins/plugin_function.c
@@ -222,6 +222,44 @@ trace_stack_handler(struct trace_seq *s, struct tep_record *record,
return 0;
}

+static int
+trace_raw_data_handler(struct trace_seq *s, struct tep_record *record,
+ struct tep_event *event, void *context)
+{
+ struct tep_format_field *field;
+ unsigned long long id;
+ int long_size;
+ void *data = record->data;
+
+ if (tep_get_field_val(s, event, "id", record, &id, 1))
+ return trace_seq_putc(s, '!');
+
+ trace_seq_printf(s, "# %llx", id);
+
+ field = tep_find_any_field(event, "buf");
+ if (!field) {
+ trace_seq_printf(s, "<CANT FIND FIELD %s>", "buf");
+ return 0;
+ }
+
+ long_size = tep_get_long_size(event->tep);
+
+ for (data += field->offset; data < record->data + record->size;
+ data += long_size) {
+ int size = sizeof(long);
+ int left = (record->data + record->size) - data;
+ int i;
+
+ if (size > left)
+ size = left;
+
+ for (i = 0; i < size; i++)
+ trace_seq_printf(s, " %02x", *(unsigned char *)(data + i));
+ }
+
+ return 0;
+}
+
int TEP_PLUGIN_LOADER(struct tep_handle *tep)
{
tep_register_event_handler(tep, -1, "ftrace", "function",
@@ -230,6 +268,9 @@ int TEP_PLUGIN_LOADER(struct tep_handle *tep)
tep_register_event_handler(tep, -1, "ftrace", "kernel_stack",
trace_stack_handler, NULL);

+ tep_register_event_handler(tep, -1, "ftrace", "raw_data",
+ trace_raw_data_handler, NULL);
+
tep_plugin_add_options("ftrace", plugin_options);

return 0;
--
2.26.2