ftrace: Allow other users of function tracing to use the output listing

The function tracer is set up to allow any other subsystem (like perf)
to use it. Ftrace already has a way to list what functions are enabled
by the global_ops. It would be very helpful to let other users of
the function tracer to be able to use the same code.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 31b9fd7aedcd..aa7559f0a224 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -202,6 +202,14 @@ enum {
         FTRACE_UPDATE_MAKE_NOP,
 };
 
+enum {
+        FTRACE_ITER_FILTER      = (1 << 0),
+        FTRACE_ITER_NOTRACE     = (1 << 1),
+        FTRACE_ITER_PRINTALL    = (1 << 2),
+        FTRACE_ITER_HASH        = (1 << 3),
+        FTRACE_ITER_ENABLED     = (1 << 4),
+};
+
 void arch_ftrace_update_code(int command);
 
 struct ftrace_rec_iter;
@@ -217,6 +225,15 @@ int ftrace_location(unsigned long ip);
 
 extern ftrace_func_t ftrace_trace_function;
 
+int ftrace_regex_open(struct ftrace_ops *ops, int flag,
+                  struct inode *inode, struct file *file);
+ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
+                            size_t cnt, loff_t *ppos);
+ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
+                             size_t cnt, loff_t *ppos);
+loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin);
+int ftrace_regex_release(struct inode *inode, struct file *file);
+
 /* defined in arch */
 extern int ftrace_ip_converted(unsigned long ip);
 extern int ftrace_dyn_arch_init(void *data);
@@ -311,6 +328,24 @@ static inline int ftrace_text_reserved(void *start, void *end)
 {
         return 0;
 }
+
+/*
+ * Again users of functions that have ftrace_ops may not
+ * have them defined when ftrace is not enabled, but these
+ * functions may still be called. Use a macro instead of inline.
+ */
+#define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
+
+static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
+                            size_t cnt, loff_t *ppos) { return -ENODEV; }
+static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
+                             size_t cnt, loff_t *ppos) { return -ENODEV; }
+static inline loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin)
+{
+        return -ENODEV;
+}
+static inline int
+ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; }
 #endif /* CONFIG_DYNAMIC_FTRACE */
 
 /* totally disable ftrace - can not re-enable after this */