linux-kernel - [PATCH v11 8/8] selftests/ftrace: Add funcgraph-retval test case

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Message-Id: <9fedbd25e63f012cade5dad13be21225fec2fb5d.1680954589.git.pengdonglin@sangfor.com.cn>
Date:   Sat,  8 Apr 2023 05:42:22 -0700
From:   Donglin Peng <pengdonglin@...gfor.com.cn>
To:     mhiramat@...nel.org, rostedt@...dmis.org, linux@...linux.org.uk,
        mark.rutland@....com, will@...nel.org, catalin.marinas@....com,
        rmk+kernel@...linux.org.uk, palmer@...belt.com,
        paul.walmsley@...ive.com, aou@...s.berkeley.edu,
        tglx@...utronix.de, dave.hansen@...ux.intel.com, x86@...nel.org,
        bp@...en8.de, hpa@...or.com, chenhuacai@...nel.org,
        zhangqing@...ngson.cn, kernel@...0n.name, mingo@...hat.com,
        peterz@...radead.org, xiehuan09@...il.com, dinghui@...gfor.com.cn,
        huangcun@...gfor.com.cn, dolinux.peng@...il.com
Cc:     linux-trace-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Donglin Peng <pengdonglin@...gfor.com.cn>
Subject: [PATCH v11 8/8] selftests/ftrace: Add funcgraph-retval test case

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

Signed-off-by: Donglin Peng <pengdonglin@...gfor.com.cn>
---
v11:
 - Fix selftest issues

v10:
 - Fix issues in selftest

v8:
 - Fix issues in selftest
---
 .../ftrace/test.d/ftrace/fgraph-retval.tc     | 44 +++++++++++++++++++
 1 file changed, 44 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..e34c0bdef3ed
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-retval.tc
@@ -0,0 +1,44 @@
+#!/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
+
+# get self PID, can not use $$, because it is PPID
+read PID _ < /proc/self/stat
+
+[ -f set_ftrace_filter ] && echo proc_reg_write > set_ftrace_filter
+[ -f set_ftrace_pid ] && echo ${PID} > set_ftrace_pid
+echo function_graph > current_tracer
+echo 1 > options/funcgraph-retval
+
+set +e
+enable_tracing
+echo > /proc/interrupts
+disable_tracing
+set -e
+
+: "Test printing the error code in signed decimal format"
+echo 0 > options/funcgraph-retval-hex
+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 1 > options/funcgraph-retval-hex
+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