[PATCH] kselftest/arm64: Add coresight test

[Jeremy Szu]

Add a script to test the coresight functionalities by performing the
perf test 'coresight'.

The script checks the prerequisites and launches a bundle of
Coresight-related tests with a 180-second timeout.

Signed-off-by: Jeremy Szu <jszu at nvidia.com>
---
 tools/testing/selftests/arm64/Makefile        |  2 +-
 .../selftests/arm64/coresight/Makefile        |  5 +++
 .../selftests/arm64/coresight/coresight.sh    | 40 +++++++++++++++++++
 .../selftests/arm64/coresight/settings        |  1 +
 4 files changed, 47 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/arm64/coresight/Makefile
 create mode 100755 tools/testing/selftests/arm64/coresight/coresight.sh
 create mode 100644 tools/testing/selftests/arm64/coresight/settings

diff --git a/tools/testing/selftests/arm64/Makefile b/tools/testing/selftests/arm64/Makefile
index 28b93cab8c0dd..2b788d7bab22d 100644
--- a/tools/testing/selftests/arm64/Makefile
+++ b/tools/testing/selftests/arm64/Makefile
@@ -4,7 +4,7 @@
 ARCH ?= $(shell uname -m 2>/dev/null || echo not)
 
 ifneq (,$(filter $(ARCH),aarch64 arm64))
-ARM64_SUBTARGETS ?= tags signal pauth fp mte bti abi
+ARM64_SUBTARGETS ?= tags signal pauth fp mte bti abi coresight
 else
 ARM64_SUBTARGETS :=
 endif
diff --git a/tools/testing/selftests/arm64/coresight/Makefile b/tools/testing/selftests/arm64/coresight/Makefile
new file mode 100644
index 0000000000000..1cc8c1f2a997e
--- /dev/null
+++ b/tools/testing/selftests/arm64/coresight/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
+TEST_PROGS := coresight.sh
+
+include ../../lib.mk
diff --git a/tools/testing/selftests/arm64/coresight/coresight.sh b/tools/testing/selftests/arm64/coresight/coresight.sh
new file mode 100755
index 0000000000000..e550957cf593b
--- /dev/null
+++ b/tools/testing/selftests/arm64/coresight/coresight.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+skip() {
+	echo "SKIP: $1"
+	exit 4
+}
+
+fail() {
+	echo "FAIL: $1"
+	exit 255
+}
+
+is_coresight_supported() {
+	if [ -d "/sys/bus/coresight/devices" ]; then
+		return 0
+	fi
+	return 255
+}
+
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+	[ "$(id -u)" -ne 0 ] && \
+		skip "this test must be run as root."
+	which perf >/dev/null 2>&1 || \
+		skip "perf is not installed."
+	perf test list 2>&1 | grep -qi 'coresight' || \
+		skip "perf doesn't support testing coresight."
+	is_coresight_supported || \
+		skip "coresight is not supported."
+
+	cmd_output=$(perf test -vv 'coresight' 2>&1)
+	perf_ret=$?
+
+	if [ $perf_ret -ne 0 ]; then
+		fail "perf command returns non-zero."
+	elif [[ $cmd_output == *"FAILED!"* ]]; then
+		echo $cmd_output
+		fail "perf test 'arm coresight' test failed!"
+	fi
+fi
diff --git a/tools/testing/selftests/arm64/coresight/settings b/tools/testing/selftests/arm64/coresight/settings
new file mode 100644
index 0000000000000..a953c96aa16e1
--- /dev/null
+++ b/tools/testing/selftests/arm64/coresight/settings
@@ -0,0 +1 @@
+timeout=180
-- 
2.34.1