kernel/trace/ftrace_internal.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_KERNEL_FTRACE_INTERNAL_H
   3 #define  _LINUX_KERNEL_FTRACE_INTERNAL_H
   4
   5 int __register_ftrace_function(struct ftrace_ops *ops);
   6 int __unregister_ftrace_function(struct ftrace_ops *ops);
   7
   8 #ifdef CONFIG_FUNCTION_TRACER
   9
  10 extern struct mutex ftrace_lock;
  11 extern struct ftrace_ops global_ops;
  12
  13 #ifdef CONFIG_DYNAMIC_FTRACE
  14
  15 int ftrace_startup(struct ftrace_ops *ops, int command);
  16 int ftrace_shutdown(struct ftrace_ops *ops, int command);
  17 int ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs);
  18 int ftrace_startup_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command);
  19 int ftrace_shutdown_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command);
  20
  21 #else /* !CONFIG_DYNAMIC_FTRACE */
  22
  23 /* Keep as macros so we do not need to define the commands */
  24 # define ftrace_startup(ops, command)                                   \
  25         ({                                                              \
  26                 int ___ret = __register_ftrace_function(ops);           \
  27                 if (!___ret)                                            \
  28                         (ops)->flags |= FTRACE_OPS_FL_ENABLED;          \
  29                 ___ret;                                                 \
  30         })
  31 # define ftrace_shutdown(ops, command)                                  \
  32         ({                                                              \
  33                 int ___ret = __unregister_ftrace_function(ops);         \
  34                 if (!___ret)                                            \
  35                         (ops)->flags &= ~FTRACE_OPS_FL_ENABLED;         \
  36                 ___ret;                                                 \
  37         })
  38 static inline int
  39 ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs)
  40 {
  41         return 1;
  42 }
  43 static inline int ftrace_startup_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command)
  44 {
  45         return -EINVAL;
  46 }
  47 static inline int ftrace_shutdown_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command)
  48 {
  49         return -EINVAL;
  50 }
  51 #endif /* CONFIG_DYNAMIC_FTRACE */
  52
  53 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
  54 extern int ftrace_graph_active;
  55 # ifdef CONFIG_DYNAMIC_FTRACE
  56 extern void fgraph_update_pid_func(void);
  57 # else
  58 static inline void fgraph_update_pid_func(void) {}
  59 # endif
  60 #else /* !CONFIG_FUNCTION_GRAPH_TRACER */
  61 # define ftrace_graph_active 0
  62 static inline void fgraph_update_pid_func(void) {}
  63 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
  64
  65 #else /* !CONFIG_FUNCTION_TRACER */
  66 #endif /* CONFIG_FUNCTION_TRACER */
  67
  68 #endif