1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_TRACE_H 3 #define _LINUX_TRACE_H 4 5 #define TRACE_EXPORT_FUNCTION BIT(0) 6 #define TRACE_EXPORT_EVENT BIT(1) 7 #define TRACE_EXPORT_MARKER BIT(2) 8 9 /* 10 * The trace export - an export of Ftrace output. The trace_export 11 * can process traces and export them to a registered destination as 12 * an addition to the current only output of Ftrace - i.e. ring buffer. 13 * 14 * If you want traces to be sent to some other place rather than ring 15 * buffer only, just need to register a new trace_export and implement 16 * its own .write() function for writing traces to the storage. 17 * 18 * next - pointer to the next trace_export 19 * write - copy traces which have been delt with ->commit() to 20 * the destination 21 * flags - which ftrace to be exported 22 */ 23 struct trace_export { 24 struct trace_export __rcu *next; 25 void (*write)(struct trace_export *, const void *, unsigned int); 26 int flags; 27 }; 28 29 #ifdef CONFIG_TRACING 30 31 int register_ftrace_export(struct trace_export *export); 32 int unregister_ftrace_export(struct trace_export *export); 33 34 struct trace_array; 35 36 void trace_printk_init_buffers(void); 37 __printf(3, 4) 38 int trace_array_printk(struct trace_array *tr, unsigned long ip, 39 const char *fmt, ...); 40 int trace_array_init_printk(struct trace_array *tr); 41 void trace_array_put(struct trace_array *tr); 42 struct trace_array *trace_array_get_by_name(const char *name); 43 int trace_array_destroy(struct trace_array *tr); 44 45 /* For osnoise tracer */ 46 int osnoise_arch_register(void); 47 void osnoise_arch_unregister(void); 48 void osnoise_trace_irq_entry(int id); 49 void osnoise_trace_irq_exit(int id, const char *desc); 50 51 #else /* CONFIG_TRACING */ 52 static inline int register_ftrace_export(struct trace_export *export) 53 { 54 return -EINVAL; 55 } 56 static inline int unregister_ftrace_export(struct trace_export *export) 57 { 58 return 0; 59 } 60 static inline void trace_printk_init_buffers(void) 61 { 62 } 63 static inline int trace_array_printk(struct trace_array *tr, unsigned long ip, 64 const char *fmt, ...) 65 { 66 return 0; 67 } 68 static inline int trace_array_init_printk(struct trace_array *tr) 69 { 70 return -EINVAL; 71 } 72 static inline void trace_array_put(struct trace_array *tr) 73 { 74 } 75 static inline struct trace_array *trace_array_get_by_name(const char *name) 76 { 77 return NULL; 78 } 79 static inline int trace_array_destroy(struct trace_array *tr) 80 { 81 return 0; 82 } 83 #endif /* CONFIG_TRACING */ 84 85 #endif /* _LINUX_TRACE_H */ 86