LXR linux/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 * The trace export - an export of Ftrace output. The trace_export
   8 * can process traces and export them to a registered destination as
   9 * an addition to the current only output of Ftrace - i.e. ring buffer.
  10 *
  11 * If you want traces to be sent to some other place rather than ring
  12 * buffer only, just need to register a new trace_export and implement
  13 * its own .write() function for writing traces to the storage.
  14 *
  15 * next         - pointer to the next trace_export
  16 * write        - copy traces which have been delt with ->commit() to
  17 *                the destination
  18 */
  19struct trace_export {
  20        struct trace_export __rcu       *next;
  21        void (*write)(struct trace_export *, const void *, unsigned int);
  22};
  23
  24int register_ftrace_export(struct trace_export *export);
  25int unregister_ftrace_export(struct trace_export *export);
  26
  27struct trace_array;
  28
  29void trace_printk_init_buffers(void);
  30int trace_array_printk(struct trace_array *tr, unsigned long ip,
  31                const char *fmt, ...);
  32int trace_array_init_printk(struct trace_array *tr);
  33void trace_array_put(struct trace_array *tr);
  34struct trace_array *trace_array_get_by_name(const char *name);
  35int trace_array_destroy(struct trace_array *tr);
  36#endif  /* CONFIG_TRACING */
  37
  38#endif  /* _LINUX_TRACE_H */
  39