[PATCH v10 8/8] selftests/ftrace: Add funcgraph-retval test case

[Donglin Peng]

Add a test case for the funcgraph-retval and funcgraph-retval-hex
trace options.

Signed-off-by: Donglin Peng <pengdonglin at sangfor.com.cn>
---
v10:
 - Fix issues in selftest

v8:
 - Fix issues in selftest
---
 .../ftrace/test.d/ftrace/fgraph-retval.tc     | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/fgraph-retval.tc

diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-retval.tc b/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-retval.tc
new file mode 100644
index 000000000000..5819aa2dd6ad
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-retval.tc
@@ -0,0 +1,43 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: ftrace - function graph print function return value
+# requires: options/funcgraph-retval options/funcgraph-retval-hex function_graph:tracer
+
+# Make sure that funcgraph-retval works
+
+fail() { # msg
+    echo $1
+    exit_fail
+}
+
+disable_tracing
+clear_trace
+
+read PID _ < /proc/self/stat
+[ -f set_ftrace_pid ] && echo ${PID} > set_ftrace_pid
+[ -f set_ftrace_filter ] && echo proc_reg_write > set_ftrace_filter
+[ -f set_graph_function ] && echo proc_reg_write > set_graph_function
+echo function_graph > current_tracer
+echo funcgraph-retval > trace_options
+
+set +e
+enable_tracing
+echo > /proc/interrupts
+disable_tracing
+set -e
+
+: "Test printing the error code in signed decimal format"
+echo nofuncgraph-retval-hex > trace_options
+count=`cat trace | grep 'proc_reg_write' | grep '= -5' | wc -l`
+if [ $count -eq 0 ]; then
+    fail "Return value can not be printed in signed decimal format"
+fi
+
+: "Test printing the error code in hexadecimal format"
+echo funcgraph-retval-hex > trace_options
+count=`cat trace | grep 'proc_reg_write' | grep 'fffffffb' | wc -l`
+if [ $count -eq 0 ]; then
+    fail "Return value can not be printed in hexadecimal format"
+fi
+
+exit 0
-- 
2.25.1