[06/12] trace-cmd: Read information for tsc to nanoseconds conversion from trace file

Commit Message

Tzvetomir Stoyanov (VMware) March 15, 2021, 6:18 a.m. UTC

Read multiplier and shift, required for TSC clock to nanosecond
conversion from the metadata of the trace file and save them in
the tracecmd input file handler.

Signed-off-by: Tzvetomir Stoyanov (VMware) <[e-mail]>
---
 lib/trace-cmd/trace-input.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

Patch

diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c
index 2093a3dc..1e925f45 100644
--- a/lib/trace-cmd/trace-input.c
+++ b/lib/trace-cmd/trace-input.c
@@ -99,6 +99,12 @@  struct host_trace_info {
 	struct ts_offset_sample	*ts_samples;
 };
 
+struct tsc2nsec {
+	int	mult;
+	int	shift;
+	int	offset;
+};
+
 struct tracecmd_input {
 	struct tep_handle	*pevent;
 	unsigned long		file_state;
@@ -118,6 +124,8 @@  struct tracecmd_input {
 	bool			use_pipe;
 	struct cpu_data 	*cpu_data;
 	long long		ts_offset;
+	struct tsc2nsec		tsc_calc;
+
 	struct host_trace_info	host;
 	double			ts2secs;
 	char *			cpustats;
@@ -2674,6 +2682,16 @@  static int handle_options(struct tracecmd_input *handle)
 		case TRACECMD_OPTION_GUEST:
 			trace_guest_load(handle, buf, size);
 			break;
+		case TRACECMD_OPTION_TSC2NSEC:
+			if (size != 12)
+				break;
+			handle->tsc_calc.mult = tep_read_number(handle->pevent,
+								buf, 4);
+			handle->tsc_calc.shift = tep_read_number(handle->pevent,
+								 buf + 4, 4);
+			handle->tsc_calc.offset = tep_read_number(handle->pevent,
+								  buf + 8, 4);
+			break;
 		default:
 			warning("unknown option %d", option);
 			break;