1 files changed, 83 insertions, 0 deletions

diff --git a/tools/lib/api/fs/tracing_path.c b/tools/lib/api/fs/tracing_path.c
new file mode 100644
index 000000000000..1fd6e1f99234
--- /dev/null
+++ b/tools/lib/api/fs/tracing_path.c
@@ -0,0 +1,83 @@
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "debugfs.h"
+#include "tracefs.h"
+
+#include "tracing_path.h"
+
+
+char tracing_path[PATH_MAX + 1]        = "/sys/kernel/debug/tracing";
+char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events";
+
+
+static void __tracing_path_set(const char *tracing, const char *mountpoint)
+{
+        snprintf(tracing_path, sizeof(tracing_path), "%s/%s",
+                 mountpoint, tracing);
+        snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s%s",
+                 mountpoint, tracing, "events");
+}
+
+static const char *tracing_path_tracefs_mount(void)
+{
+        const char *mnt;
+
+        mnt = tracefs_mount(NULL);
+        if (!mnt)
+                return NULL;
+
+        __tracing_path_set("", mnt);
+
+        return mnt;
+}
+
+static const char *tracing_path_debugfs_mount(void)
+{
+        const char *mnt;
+
+        mnt = debugfs_mount(NULL);
+        if (!mnt)
+                return NULL;
+
+        __tracing_path_set("tracing/", mnt);
+
+        return mnt;
+}
+
+const char *tracing_path_mount(void)
+{
+        const char *mnt;
+
+        mnt = tracing_path_tracefs_mount();
+        if (mnt)
+                return mnt;
+
+        mnt = tracing_path_debugfs_mount();
+
+        return mnt;
+}
+
+void tracing_path_set(const char *mntpt)
+{
+        __tracing_path_set("tracing/", mntpt);
+}
+
+char *get_tracing_file(const char *name)
+{
+        char *file;
+
+        if (asprintf(&file, "%s/%s", tracing_path, name) < 0)
+                return NULL;
+
+        return file;
+}
+
+void put_tracing_file(char *file)
+{
+        free(file);
+}