[PATCH] ftracetest: add kprobes on ftrace testcase

[Heiko Carstens]

Add a kprobes on ftrace testcase. The testcase verifies that
- enabling and disabling function tracing works on a function which
  already contains a dynamic kprobe
- adding and removing a dynamic kprobe works on a function which is
  already enabled for function tracing

Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
---
 .../ftrace/test.d/kprobe/kprobe_ftrace.tc          | 56 ++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
new file mode 100644
index 000000000000..4ddd18054fda
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
@@ -0,0 +1,56 @@
+#!/bin/sh
+# description: Kprobe dynamic event with function tracer
+
+[ -f kprobe_events ] || exit_unsupported # this is configurable
+grep function available_tracers || exit_unsupported # this is configurable
+
+# prepare
+echo nop > current_tracer
+echo do_fork > set_ftrace_filter
+echo 0 > events/enable
+echo > kprobe_events
+echo 'p:testprobe do_fork' > kprobe_events
+
+# kprobe on / ftrace off
+echo 1 > events/kprobes/testprobe/enable
+echo > trace
+( echo "forked")
+grep testprobe trace
+! grep 'do_fork <-' trace
+
+# kprobe on / ftrace on
+echo function > current_tracer
+echo > trace
+( echo "forked")
+grep testprobe trace
+grep 'do_fork <-' trace
+
+# kprobe off / ftrace on
+echo 0 > events/kprobes/testprobe/enable
+echo > trace
+( echo "forked")
+! grep testprobe trace
+grep 'do_fork <-' trace
+
+# kprobe on / ftrace on
+echo 1 > events/kprobes/testprobe/enable
+echo function > current_tracer
+echo > trace
+( echo "forked")
+echo > trace
+grep testprobe trace
+grep 'do_fork <-' trace
+
+# kprobe on / ftrace off
+echo nop > current_tracer
+echo > trace
+( echo "forked")
+grep testprobe trace
+! grep 'do_fork <-' trace
+
+# cleanup
+echo nop > current_tracer
+echo > set_ftrace_filter
+echo 0 > events/kprobes/testprobe/enable
+echo > kprobe_events
+echo > trace
-- 
1.8.5.5

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