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 */ 23struct trace_export { 24 struct trace_export __rcu *next; 25 void (*write)(struct trace_export *, const void *, unsigned int); 26 int flags; 27}; 28 29struct trace_array; 30 31#ifdef CONFIG_TRACING 32 33int register_ftrace_export(struct trace_export *export); 34int unregister_ftrace_export(struct trace_export *export); 35 36/** 37 * trace_array_puts - write a constant string into the trace buffer. 38 * @tr: The trace array to write to 39 * @str: The constant string to write 40 */ 41#define trace_array_puts(tr, str) \ 42 ({ \ 43 str ? __trace_array_puts(tr, _THIS_IP_, str, strlen(str)) : -1; \ 44 }) 45int __trace_array_puts(struct trace_array *tr, unsigned long ip, 46 const char *str, int size); 47 48void trace_printk_init_buffers(void); 49__printf(3, 4) 50int trace_array_printk(struct trace_array *tr, unsigned long ip, 51 const char *fmt, ...); 52int trace_array_init_printk(struct trace_array *tr); 53void trace_array_put(struct trace_array *tr); 54struct trace_array *trace_array_get_by_name(const char *name, const char *systems); 55int trace_array_destroy(struct trace_array *tr); 56 57/* For osnoise tracer */ 58int osnoise_arch_register(void); 59void osnoise_arch_unregister(void); 60void osnoise_trace_irq_entry(int id); 61void osnoise_trace_irq_exit(int id, const char *desc); 62 63#else /* CONFIG_TRACING */ 64static inline int register_ftrace_export(struct trace_export *export) 65{ 66 return -EINVAL; 67} 68static inline int unregister_ftrace_export(struct trace_export *export) 69{ 70 return 0; 71} 72static inline void trace_printk_init_buffers(void) 73{ 74} 75static inline int trace_array_printk(struct trace_array *tr, unsigned long ip, 76 const char *fmt, ...) 77{ 78 return 0; 79} 80static inline int trace_array_init_printk(struct trace_array *tr) 81{ 82 return -EINVAL; 83} 84static inline void trace_array_put(struct trace_array *tr) 85{ 86} 87static inline struct trace_array *trace_array_get_by_name(const char *name, const char *systems) 88{ 89 return NULL; 90} 91static inline int trace_array_destroy(struct trace_array *tr) 92{ 93 return 0; 94} 95#endif /* CONFIG_TRACING */ 96 97#endif /* _LINUX_TRACE_H */ 98