1 files changed, 84 insertions, 0 deletions
diff --git a/sys/cddl/dev/dtrace/dtrace_anon.c b/sys/cddl/dev/dtrace/dtrace_anon.c
new file mode 100644
index 000000000000..b81ec5be3f11
--- /dev/null
+++ b/sys/cddl/dev/dtrace/dtrace_anon.c
@@ -0,0 +1,84 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * DTrace Anonymous Enabling Functions
+ */
+static void
+dtrace_anon_init(void *dummy)
+{
+	dtrace_state_t *state = NULL;
+	dtrace_enabling_t *enab;
+
+	mutex_enter(&cpu_lock);
+	mutex_enter(&dtrace_provider_lock);
+	mutex_enter(&dtrace_lock);
+
+	dtrace_anon_property();
+
+	mutex_exit(&cpu_lock);
+
+	/*
+	 * If there are already providers, we must ask them to provide their
+	 * probes, and then match any anonymous enabling against them.  Note
+	 * that there should be no other retained enablings at this time:
+	 * the only retained enablings at this time should be the anonymous
+	 * enabling.
+	 */
+	if (dtrace_anon.dta_enabling != NULL) {
+		ASSERT(dtrace_retained == dtrace_anon.dta_enabling);
+
+		dtrace_enabling_provide(NULL);
+		state = dtrace_anon.dta_state;
+
+		/*
+		 * We couldn't hold cpu_lock across the above call to
+		 * dtrace_enabling_provide(), but we must hold it to actually
+		 * enable the probes.  We have to drop all of our locks, pick
+		 * up cpu_lock, and regain our locks before matching the
+		 * retained anonymous enabling.
+		 */
+		mutex_exit(&dtrace_lock);
+		mutex_exit(&dtrace_provider_lock);
+
+		mutex_enter(&cpu_lock);
+		mutex_enter(&dtrace_provider_lock);
+		mutex_enter(&dtrace_lock);
+
+		if ((enab = dtrace_anon.dta_enabling) != NULL)
+			(void) dtrace_enabling_match(enab, NULL);
+
+		mutex_exit(&cpu_lock);
+	}
+
+	mutex_exit(&dtrace_provider_lock);
+	mutex_exit(&dtrace_lock);
+
+	if (state != NULL) {
+		/*
+		 * If we created any anonymous state, set it going now.
+		 */
+		(void) dtrace_state_go(state, &dtrace_anon.dta_beganon);
+	}
+}