| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _LINUX_TRACE_H |
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| 3 | #define _LINUX_TRACE_H |
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| 4 | |
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| 5 | #define TRACE_EXPORT_FUNCTION BIT(0) |
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| 6 | #define TRACE_EXPORT_EVENT BIT(1) |
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| 7 | #define TRACE_EXPORT_MARKER BIT(2) |
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| 8 | |
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| 9 | /* |
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| 10 | * The trace export - an export of Ftrace output. The trace_export |
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| 11 | * can process traces and export them to a registered destination as |
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| 12 | * an addition to the current only output of Ftrace - i.e. ring buffer. |
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| 13 | * |
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| 14 | * If you want traces to be sent to some other place rather than ring |
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| 15 | * buffer only, just need to register a new trace_export and implement |
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| 16 | * its own .write() function for writing traces to the storage. |
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| 17 | * |
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| 18 | * next - pointer to the next trace_export |
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| 19 | * write - copy traces which have been delt with ->commit() to |
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| 20 | * the destination |
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| 21 | * flags - which ftrace to be exported |
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| 22 | */ |
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| 23 | struct trace_export { |
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| 24 | struct trace_export __rcu *next; |
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| 25 | void (*write)(struct trace_export *, const void *, unsigned int); |
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| 26 | int flags; |
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| 27 | }; |
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| 28 | |
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| 29 | struct trace_array; |
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| 30 | |
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| 31 | #ifdef CONFIG_TRACING |
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| 32 | |
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| 33 | int register_ftrace_export(struct trace_export *export); |
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| 34 | int unregister_ftrace_export(struct trace_export *export); |
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| 35 | |
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| 36 | /** |
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| 37 | * trace_array_puts - write a constant string into the trace buffer. |
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| 38 | * @tr: The trace array to write to |
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| 39 | * @str: The constant string to write |
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| 40 | */ |
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| 41 | #define trace_array_puts(tr, str) \ |
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| 42 | ({ \ |
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| 43 | str ? __trace_array_puts(tr, _THIS_IP_, str, strlen(str)) : -1; \ |
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| 44 | }) |
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| 45 | int __trace_array_puts(struct trace_array *tr, unsigned long ip, |
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| 46 | const char *str, int size); |
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| 47 | |
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| 48 | void trace_printk_init_buffers(void); |
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| 49 | __printf(3, 4) |
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| 50 | int trace_array_printk(struct trace_array *tr, unsigned long ip, |
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| 51 | const char *fmt, ...); |
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| 52 | int trace_array_init_printk(struct trace_array *tr); |
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| 53 | void trace_array_put(struct trace_array *tr); |
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| 54 | struct trace_array *trace_array_get_by_name(const char *name, const char *systems); |
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| 55 | int trace_array_destroy(struct trace_array *tr); |
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| 56 | |
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| 57 | /* For osnoise tracer */ |
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| 58 | int osnoise_arch_register(void); |
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| 59 | void osnoise_arch_unregister(void); |
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| 60 | void osnoise_trace_irq_entry(int id); |
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| 61 | void osnoise_trace_irq_exit(int id, const char *desc); |
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| 62 | |
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| 63 | #else /* CONFIG_TRACING */ |
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| 64 | static inline int register_ftrace_export(struct trace_export *export) |
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| 65 | { |
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| 66 | return -EINVAL; |
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| 67 | } |
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| 68 | static inline int unregister_ftrace_export(struct trace_export *export) |
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| 69 | { |
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| 70 | return 0; |
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| 71 | } |
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| 72 | static inline void trace_printk_init_buffers(void) |
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| 73 | { |
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| 74 | } |
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| 75 | static inline __printf(3, 4) |
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| 76 | int trace_array_printk(struct trace_array *tr, unsigned long ip, const char *fmt, ...) |
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| 77 | { |
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| 78 | return 0; |
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| 79 | } |
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| 80 | static inline int trace_array_init_printk(struct trace_array *tr) |
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| 81 | { |
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| 82 | return -EINVAL; |
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| 83 | } |
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| 84 | static inline void trace_array_put(struct trace_array *tr) |
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| 85 | { |
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| 86 | } |
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| 87 | static inline struct trace_array *trace_array_get_by_name(const char *name, const char *systems) |
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| 88 | { |
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| 89 | return NULL; |
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| 90 | } |
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| 91 | static inline int trace_array_destroy(struct trace_array *tr) |
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| 92 | { |
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| 93 | return 0; |
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| 94 | } |
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| 95 | #endif /* CONFIG_TRACING */ |
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| 96 | |
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| 97 | #endif /* _LINUX_TRACE_H */ |
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| 98 | |
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