From 185b7dc1d467a9c9b107450558b460e59596adef Mon Sep 17 00:00:00 2001
From: Jerin Jacob <jerinj@marvell.com>
Date: Thu, 23 Apr 2020 00:33:23 +0530
Subject: [PATCH] trace: save bootup timestamp

Find epoch_sec, epoch_nsec and uptime_ticks time information
on eal_trace_init()/bootup to derive the time in the trace.

Signed-off-by: Jerin Jacob <jerinj@marvell.com>
Acked-by: David Marchand <david.marchand@redhat.com>
---
 lib/librte_eal/common/eal_common_trace.c      |  3 +++
 .../common/eal_common_trace_utils.c           | 22 +++++++++++++++++++
 lib/librte_eal/common/eal_trace.h             |  5 +++++
 3 files changed, 30 insertions(+)

diff --git a/lib/librte_eal/common/eal_common_trace.c b/lib/librte_eal/common/eal_common_trace.c
index 55d7fa712a..d88b2cd42c 100644
--- a/lib/librte_eal/common/eal_common_trace.c
+++ b/lib/librte_eal/common/eal_common_trace.c
@@ -61,6 +61,9 @@ eal_trace_init(void)
 	if (trace_mkdir())
 		goto fail;
 
+	/* Save current epoch timestamp for future use */
+	if (trace_epoch_time_save() < 0)
+		goto fail;
 
 	rte_trace_mode_set(trace.mode);
 
diff --git a/lib/librte_eal/common/eal_common_trace_utils.c b/lib/librte_eal/common/eal_common_trace_utils.c
index 7fc7022e83..6b43802203 100644
--- a/lib/librte_eal/common/eal_common_trace_utils.c
+++ b/lib/librte_eal/common/eal_common_trace_utils.c
@@ -98,6 +98,28 @@ trace_session_name_generate(char *trace_dir)
 	return -rte_errno;
 }
 
+int
+trace_epoch_time_save(void)
+{
+	struct trace *trace = trace_obj_get();
+	struct timespec epoch = { 0, 0 };
+	uint64_t avg, start, end;
+
+	start = rte_get_tsc_cycles();
+	if (clock_gettime(CLOCK_REALTIME, &epoch) < 0) {
+		trace_err("failed to get the epoch time");
+		return -1;
+	}
+	end = rte_get_tsc_cycles();
+	avg = (start + end) >> 1;
+
+	trace->epoch_sec = (uint64_t) epoch.tv_sec;
+	trace->epoch_nsec = (uint64_t) epoch.tv_nsec;
+	trace->uptime_ticks = avg;
+
+	return 0;
+}
+
 static int
 trace_dir_default_path_get(char *dir_path)
 {
diff --git a/lib/librte_eal/common/eal_trace.h b/lib/librte_eal/common/eal_trace.h
index 4f5da7a8e8..51bb2c3fe3 100644
--- a/lib/librte_eal/common/eal_trace.h
+++ b/lib/librte_eal/common/eal_trace.h
@@ -5,6 +5,7 @@
 #ifndef __EAL_TRACE_H
 #define __EAL_TRACE_H
 
+#include <rte_cycles.h>
 #include <rte_spinlock.h>
 #include <rte_trace.h>
 #include <rte_trace_point.h>
@@ -37,6 +38,9 @@ struct trace {
 	rte_uuid_t uuid;
 	uint32_t buff_len;
 	uint32_t nb_trace_points;
+	uint64_t epoch_sec;
+	uint64_t epoch_nsec;
+	uint64_t uptime_ticks;
 	rte_spinlock_t lock;
 };
 
@@ -59,6 +63,7 @@ struct trace_point_head *trace_list_head_get(void);
 bool trace_has_duplicate_entry(void);
 void trace_uuid_generate(void);
 int trace_mkdir(void);
+int trace_epoch_time_save(void);
 
 /* EAL interface */
 int eal_trace_init(void);