tools lib api fs: Add tracefs into fs.c object

Adding tracefs support into fs.c framework. It'll replace the tracefs
object functionality in following patches.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Raphael Beamonte <raphael.beamonte@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1441180605-24737-11-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 29 insertions, 0 deletions

diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index 798052cbc7c0..ef16d2a83a27 100644
--- a/tools/lib/api/fs/fs.c
+++ b/tools/lib/api/fs/fs.c
@@ -28,6 +28,10 @@
 #define DEBUGFS_MAGIC          0x64626720
 #endif
 
+#ifndef TRACEFS_MAGIC
+#define TRACEFS_MAGIC          0x74726163
+#endif
+
 static const char * const sysfs__fs_known_mountpoints[] = {
         "/sys",
         0,
@@ -48,6 +52,19 @@ static const char * const debugfs__known_mountpoints[] = {
         0,
 };
 
+
+#ifndef TRACEFS_DEFAULT_PATH
+#define TRACEFS_DEFAULT_PATH "/sys/kernel/tracing"
+#endif
+
+static const char * const tracefs__known_mountpoints[] = {
+        TRACEFS_DEFAULT_PATH,
+        "/sys/kernel/debug/tracing",
+        "/tracing",
+        "/trace",
+        0,
+};
+
 struct fs {
         const char              *name;
         const char * const      *mounts;
@@ -60,8 +77,13 @@ enum {
         FS__SYSFS   = 0,
         FS__PROCFS  = 1,
         FS__DEBUGFS = 2,
+        FS__TRACEFS = 3,
 };
 
+#ifndef TRACEFS_MAGIC
+#define TRACEFS_MAGIC 0x74726163
+#endif
+
 static struct fs fs__entries[] = {
         [FS__SYSFS] = {
                 .name   = "sysfs",
@@ -78,6 +100,11 @@ static struct fs fs__entries[] = {
                 .mounts = debugfs__known_mountpoints,
                 .magic  = DEBUGFS_MAGIC,
         },
+        [FS__TRACEFS] = {
+                .name   = "tracefs",
+                .mounts = tracefs__known_mountpoints,
+                .magic  = TRACEFS_MAGIC,
+        },
 };
 
 static bool fs__read_mounts(struct fs *fs)
@@ -197,6 +224,7 @@ const char *name##__mountpoint(void)	\
 FS__MOUNTPOINT(sysfs,   FS__SYSFS);
 FS__MOUNTPOINT(procfs,  FS__PROCFS);
 FS__MOUNTPOINT(debugfs, FS__DEBUGFS);
+FS__MOUNTPOINT(tracefs, FS__TRACEFS);
 
 int filename__read_int(const char *filename, int *value)
 {
diff --git a/tools/lib/api/fs/fs.h b/tools/lib/api/fs/fs.h
index a4e6b1d93d2f..9013227ae0d1 100644
--- a/tools/lib/api/fs/fs.h
+++ b/tools/lib/api/fs/fs.h
@@ -12,6 +12,7 @@
 const char *sysfs__mountpoint(void);
 const char *procfs__mountpoint(void);
 const char *debugfs__mountpoint(void);
+const char *tracefs__mountpoint(void);
 
 int filename__read_int(const char *filename, int *value);
 int sysctl__read_int(const char *sysctl, int *value);