dtrace: profile and tick providers built on cyclics

Probes are constructed dynamically as called upon by the user: some
default commonly-used probes for common timing frequencies are provided
whether or not called upon.

Signed-off-by: Kris Van Hees <[email protected]>
Signed-off-by: Nick Alcock <[email protected]>
Signed-off-by: Tomas Jedlicka <[email protected]>
Signed-off-by: Eugene Loh <[email protected]>
Signed-off-by: David Mc Lean <[email protected]>
Signed-off-by: Vincent Lim <[email protected]>

Author: kvanhees

dtrace/Makefile

@@ -3,6 +3,7 @@
 #
 
 obj-$(CONFIG_DT_CORE)		+= dtrace.o
+obj-$(CONFIG_DT_PROFILE)	+= profile.o
 obj-$(CONFIG_DT_SDT)		+= sdt.o
 obj-$(CONFIG_DT_SYSTRACE)	+= systrace.o
 obj-$(CONFIG_DT_DT_TEST)	+= dt_test.o
@@ -16,6 +17,7 @@ dtrace-y			:= dtrace_mod.o dtrace_dev.o \
 				   dtrace_probe.o dtrace_probe_ctx.o \
 				   dtrace_ptofapi.o dtrace_predicate.o \
 				   dtrace_spec.o dtrace_state.o dtrace_util.o
+profile-y			:= profile_mod.o profile_dev.o
 sdt-y				:= sdt_mod.o sdt_dev.o
 systrace-y			:= systrace_mod.o systrace_dev.o
 dt_test-y			:= dt_test_mod.o dt_test_dev.o

dtrace/profile.h

@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Dynamic Tracing for Linux - profile provider
+ *
+ * Copyright (c) 2010, 2017, Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _PROFILE_H_
+#define _PROFILE_H_
+
+extern void profile_provide(void *, const dtrace_probedesc_t *);
+extern int profile_enable(void *, dtrace_id_t, void *);
+extern void profile_disable(void *, dtrace_id_t, void *);
+extern int profile_usermode(void *, dtrace_id_t, void *);
+extern void profile_destroy(void *, dtrace_id_t, void *);
+
+extern dtrace_provider_id_t	profile_id;
+
+extern int profile_dev_init(void);
+extern void profile_dev_exit(void);
+
+#endif /* _PROFILE_H_ */