Adapt lttng-modules to Linux 4.10 cpu hotplug state machine

[lttng-modules.git] / lttng-cpuhotplug.h

diff --git a/lttng-cpuhotplug.h b/lttng-cpuhotplug.h
new file mode 100644 (file)
index 0000000..da965d2
--- /dev/null
+++ b/lttng-cpuhotplug.h
@@ -0,0 +1,64 @@
+#ifndef LTTNG_CPUHOTPLUG_H
+#define LTTNG_CPUHOTPLUG_H
+
+/*
+ * lttng-cpuhotplug.h
+ *
+ * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/cpuhotplug.h>
+
+struct lttng_cpuhp_node;
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
+enum lttng_cpuhp_component {
+       LTTNG_RING_BUFFER_FRONTEND,
+       LTTNG_RING_BUFFER_BACKEND,
+       LTTNG_RING_BUFFER_ITER,
+       LTTNG_CONTEXT_PERF_COUNTERS,
+};
+
+struct lttng_cpuhp_node {
+       enum lttng_cpuhp_component component;
+       struct hlist_node node;
+};
+
+extern enum cpuhp_state lttng_hp_prepare;
+extern enum cpuhp_state lttng_hp_online;
+
+int lttng_cpuhp_rb_backend_prepare(unsigned int cpu,
+                struct lttng_cpuhp_node *node);
+int lttng_cpuhp_rb_frontend_dead(unsigned int cpu,
+               struct lttng_cpuhp_node *node);
+int lttng_cpuhp_rb_frontend_online(unsigned int cpu,
+               struct lttng_cpuhp_node *node);
+int lttng_cpuhp_rb_frontend_offline(unsigned int cpu,
+               struct lttng_cpuhp_node *node);
+int lttng_cpuhp_rb_iter_online(unsigned int cpu,
+               struct lttng_cpuhp_node *node);
+
+/* Ring buffer is a separate library. */
+void lttng_rb_set_hp_prepare(enum cpuhp_state val);
+void lttng_rb_set_hp_online(enum cpuhp_state val);
+
+extern enum cpuhp_state lttng_rb_hp_prepare;
+extern enum cpuhp_state lttng_rb_hp_online;
+
+#endif
+
+#endif /* LTTNG_CPUHOTPLUG_H */