rv/include: Add instrumentation helper functions

Instrumentation helper functions to facilitate the instrumentation of
auto-generated RV monitors create by dot2k.

Link: https://lkml.kernel.org/r/[e-mail]

Cc: Wim Van Sebroeck <[e-mail]>
Cc: Guenter Roeck <[e-mail]>
Cc: Jonathan Corbet <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: Catalin Marinas <[e-mail]>
Cc: Marco Elver <[e-mail]>
Cc: Dmitry Vyukov <[e-mail]>
Cc: "Paul E. McKenney" <[e-mail]>
Cc: Shuah Khan <[e-mail]>
Cc: Gabriele Paoloni <[e-mail]>
Cc: Juri Lelli <[e-mail]>
Cc: Clark Williams <[e-mail]>
Cc: Tao Zhou <[e-mail]>
Cc: Randy Dunlap <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Daniel Bristot de Oliveira <[e-mail]>
Signed-off-by: Steven Rostedt (Google) <[e-mail]>

include/rv/instrumentation.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <[e-mail]>
+ *
+ * Helper functions to facilitate the instrumentation of auto-generated
+ * RV monitors create by dot2k.
+ *
+ * The dot2k tool is available at tools/verification/dot2/
+ */
+
+#include <linux/ftrace.h>
+
+/*
+ * rv_attach_trace_probe - check and attach a handler function to a tracepoint
+ */
+#define rv_attach_trace_probe(monitor, tp, rv_handler)					\
+	do {										\
+		check_trace_callback_type_##tp(rv_handler);				\
+		WARN_ONCE(register_trace_##tp(rv_handler, NULL),			\
+				"fail attaching " #monitor " " #tp "handler");		\
+	} while (0)
+
+/*
+ * rv_detach_trace_probe - detach a handler function to a tracepoint
+ */
+#define rv_detach_trace_probe(monitor, tp, rv_handler)					\
+	do {										\
+		unregister_trace_##tp(rv_handler, NULL);				\
+	} while (0)