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d503b8f747
Add a generic trace_array_puts() that can be used to "trace_puts()" into an allocated trace_array instance. This is just another variant of trace_array_printk(). Link: https://lkml.kernel.org/r/20230207173026.584717290@goodmis.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Ross Zwisler <zwisler@google.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_TRACE_H
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#define _LINUX_TRACE_H
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#define TRACE_EXPORT_FUNCTION BIT(0)
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#define TRACE_EXPORT_EVENT BIT(1)
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#define TRACE_EXPORT_MARKER BIT(2)
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/*
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* The trace export - an export of Ftrace output. The trace_export
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* can process traces and export them to a registered destination as
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* an addition to the current only output of Ftrace - i.e. ring buffer.
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*
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* If you want traces to be sent to some other place rather than ring
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* buffer only, just need to register a new trace_export and implement
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* its own .write() function for writing traces to the storage.
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*
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* next - pointer to the next trace_export
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* write - copy traces which have been delt with ->commit() to
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* the destination
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* flags - which ftrace to be exported
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*/
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struct trace_export {
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struct trace_export __rcu *next;
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void (*write)(struct trace_export *, const void *, unsigned int);
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int flags;
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};
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struct trace_array;
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#ifdef CONFIG_TRACING
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int register_ftrace_export(struct trace_export *export);
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int unregister_ftrace_export(struct trace_export *export);
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/**
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* trace_array_puts - write a constant string into the trace buffer.
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* @tr: The trace array to write to
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* @str: The constant string to write
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*/
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#define trace_array_puts(tr, str) \
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({ \
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str ? __trace_array_puts(tr, _THIS_IP_, str, strlen(str)) : -1; \
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})
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int __trace_array_puts(struct trace_array *tr, unsigned long ip,
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const char *str, int size);
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void trace_printk_init_buffers(void);
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__printf(3, 4)
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int trace_array_printk(struct trace_array *tr, unsigned long ip,
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const char *fmt, ...);
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int trace_array_init_printk(struct trace_array *tr);
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void trace_array_put(struct trace_array *tr);
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struct trace_array *trace_array_get_by_name(const char *name);
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int trace_array_destroy(struct trace_array *tr);
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/* For osnoise tracer */
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int osnoise_arch_register(void);
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void osnoise_arch_unregister(void);
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void osnoise_trace_irq_entry(int id);
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void osnoise_trace_irq_exit(int id, const char *desc);
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#else /* CONFIG_TRACING */
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static inline int register_ftrace_export(struct trace_export *export)
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{
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return -EINVAL;
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}
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static inline int unregister_ftrace_export(struct trace_export *export)
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{
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return 0;
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}
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static inline void trace_printk_init_buffers(void)
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{
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}
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static inline int trace_array_printk(struct trace_array *tr, unsigned long ip,
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const char *fmt, ...)
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{
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return 0;
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}
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static inline int trace_array_init_printk(struct trace_array *tr)
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{
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return -EINVAL;
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}
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static inline void trace_array_put(struct trace_array *tr)
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{
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}
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static inline struct trace_array *trace_array_get_by_name(const char *name)
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{
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return NULL;
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}
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static inline int trace_array_destroy(struct trace_array *tr)
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{
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return 0;
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}
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#endif /* CONFIG_TRACING */
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#endif /* _LINUX_TRACE_H */
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