ust: add kernel versions for tracer.c (ltt-tracer.c) tracer.h (ltt-tracer.h) and...

[ust.git] / libtracing / tracercore.c

diff --git a/libtracing/tracercore.c b/libtracing/tracercore.c
new file mode 100644 (file)
index 0000000..18db91d
--- /dev/null
+++ b/libtracing/tracercore.c
@@ -0,0 +1,71 @@
+/*
+ * LTT core in-kernel infrastructure.
+ *
+ * Copyright 2006 - Mathieu Desnoyers mathieu.desnoyers@polymtl.ca
+ *
+ * Distributed under the GPL license
+ */
+
+#include <linux/ltt-core.h>
+#include <linux/percpu.h>
+#include <linux/module.h>
+#include <linux/debugfs.h>
+
+/* Traces structures */
+struct ltt_traces ltt_traces = {
+       .setup_head = LIST_HEAD_INIT(ltt_traces.setup_head),
+       .head = LIST_HEAD_INIT(ltt_traces.head),
+};
+EXPORT_SYMBOL(ltt_traces);
+
+/* Traces list writer locking */
+static DEFINE_MUTEX(ltt_traces_mutex);
+
+/* dentry of ltt's root dir */
+static struct dentry *ltt_root_dentry;
+struct dentry *get_ltt_root(void)
+{
+       if (!ltt_root_dentry) {
+               ltt_root_dentry = debugfs_create_dir(LTT_ROOT, NULL);
+               if (!ltt_root_dentry)
+                       printk(KERN_ERR "LTT : create ltt root dir failed\n");
+       }
+       return ltt_root_dentry;
+}
+EXPORT_SYMBOL_GPL(get_ltt_root);
+
+void ltt_lock_traces(void)
+{
+       mutex_lock(&ltt_traces_mutex);
+}
+EXPORT_SYMBOL_GPL(ltt_lock_traces);
+
+void ltt_unlock_traces(void)
+{
+       mutex_unlock(&ltt_traces_mutex);
+}
+EXPORT_SYMBOL_GPL(ltt_unlock_traces);
+
+DEFINE_PER_CPU(unsigned int, ltt_nesting);
+EXPORT_PER_CPU_SYMBOL(ltt_nesting);
+
+int ltt_run_filter_default(void *trace, uint16_t eID)
+{
+       return 1;
+}
+
+/* This function pointer is protected by a trace activation check */
+ltt_run_filter_functor ltt_run_filter = ltt_run_filter_default;
+EXPORT_SYMBOL_GPL(ltt_run_filter);
+
+void ltt_filter_register(ltt_run_filter_functor func)
+{
+       ltt_run_filter = func;
+}
+EXPORT_SYMBOL_GPL(ltt_filter_register);
+
+void ltt_filter_unregister(void)
+{
+       ltt_run_filter = ltt_run_filter_default;
+}
+EXPORT_SYMBOL_GPL(ltt_filter_unregister);