1 files changed, 102 insertions, 0 deletions
diff --git a/tools/testing/selftests/ftrace/test.d/remotes/trace.tc b/tools/testing/selftests/ftrace/test.d/remotes/trace.tc
new file mode 100644
index 000000000000..bc9377a70e8d
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/remotes/trace.tc
@@ -0,0 +1,102 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Test trace remote non-consuming read
+# requires: remotes/test
+
+. $TEST_DIR/remotes/functions
+
+test_trace()
+{
+	echo 0 > tracing_on
+    assert_unloaded
+
+    echo 7 > buffer_size_kb
+    echo 1 > tracing_on
+    assert_loaded
+
+    # Simple test: Emit few events and try to read them
+    for i in $(seq 1 8); do
+        echo $i > write_event
+    done
+
+    check_trace 1 8 trace
+
+    #
+    # Test interaction with consuming read
+    #
+
+    cat trace_pipe > /dev/null &
+    pid=$!
+
+    sleep 1
+    kill $pid
+
+    test $(wc -l < trace) -eq 0
+
+    for i in $(seq 16 32); do
+        echo $i > write_event
+    done
+
+    check_trace 16 32 trace
+
+    #
+    # Test interaction with reset
+    #
+
+    echo 0 > trace
+
+    test $(wc -l < trace) -eq 0
+
+    for i in $(seq 1 8); do
+        echo $i > write_event
+    done
+
+    check_trace 1 8 trace
+
+    #
+    # Test interaction with lost events
+    #
+
+    # Ensure the writer is not on the reader page by reloading the buffer
+    reload_remote
+
+    # Ensure ring-buffer overflow by emitting events from the same CPU
+    for cpu in $(get_cpu_ids); do
+        break
+    done
+
+    events_per_page=$(($(get_page_size) / $(get_selftest_event_size))) # Approx: does not take TS into account
+    nr_events=$(($events_per_page * 2))
+    for i in $(seq 1 $nr_events); do
+        taskset -c $cpu echo $i > write_event
+    done
+
+    id=$(sed -n -e '1s/\[[0-9]*\]\s*[0-9]*.[0-9]*: [a-z]* id=\([0-9]*\)/\1/p' trace)
+    test $id -ne 1
+
+    check_trace $id $nr_events trace
+
+    #
+    # Test per-CPU interface
+    #
+    echo 0 > trace
+
+    for cpu in $(get_cpu_ids) ; do
+        taskset -c $cpu echo $cpu > write_event
+    done
+
+    for cpu in $(get_cpu_ids); do
+        cd per_cpu/cpu$cpu/
+
+        check_trace $cpu $cpu trace
+
+        cd - > /dev/null
+    done
+}
+
+if [ -z "$SOURCE_REMOTE_TEST" ]; then
+    set -e
+
+    setup_remote_test
+    test_trace
+fi