include/linux/trace.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_TRACE_H
   3 #define _LINUX_TRACE_H
   4
   5 #ifdef CONFIG_TRACING
   6
   7 #define TRACE_EXPORT_FUNCTION   BIT(0)
   8 #define TRACE_EXPORT_EVENT      BIT(1)
   9 #define TRACE_EXPORT_MARKER     BIT(2)
  10
  11 /*
  12  * The trace export - an export of Ftrace output. The trace_export
  13  * can process traces and export them to a registered destination as
  14  * an addition to the current only output of Ftrace - i.e. ring buffer.
  15  *
  16  * If you want traces to be sent to some other place rather than ring
  17  * buffer only, just need to register a new trace_export and implement
  18  * its own .write() function for writing traces to the storage.
  19  *
  20  * next         - pointer to the next trace_export
  21  * write        - copy traces which have been delt with ->commit() to
  22  *                the destination
  23  * flags        - which ftrace to be exported
  24  */
  25 struct trace_export {
  26         struct trace_export __rcu       *next;
  27         void (*write)(struct trace_export *, const void *, unsigned int);
  28         int flags;
  29 };
  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 #endif  /* CONFIG_TRACING */
  52
  53 #endif  /* _LINUX_TRACE_H */