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#ifndef _LINUX_RING_BUFFER_H
#define _LINUX_RING_BUFFER_H
#include <linux/mm.h>
#include <linux/seq_file.h>
struct ring_buffer;
struct ring_buffer_iter;
/*
* Don't refer to this struct directly, use functions below.
*/
struct ring_buffer_event {
u32 type:2, len:3, time_delta:27;
u32 array[];
};
/**
* enum ring_buffer_type - internal ring buffer types
*
* @RINGBUF_TYPE_PADDING: Left over page padding
* array is ignored
* size is variable depending on how much
* padding is needed
*
* @RINGBUF_TYPE_TIME_EXTEND: Extend the time delta
* array[0] = time delta (28 .. 59)
* size = 8 bytes
*
* @RINGBUF_TYPE_TIME_STAMP: Sync time stamp with external clock
* array[0] = tv_nsec
* array[1..2] = tv_sec
* size = 16 bytes
*
* @RINGBUF_TYPE_DATA: Data record
* If len is zero:
* array[0] holds the actual length
* array[1..(length+3)/4] holds data
* size = 4 + 4 + length (bytes)
* else
* length = len << 2
* array[0..(length+3)/4-1] holds data
* size = 4 + length (bytes)
*/
enum ring_buffer_type {
RINGBUF_TYPE_PADDING,
RINGBUF_TYPE_TIME_EXTEND,
/* FIXME: RINGBUF_TYPE_TIME_STAMP not implemented */
RINGBUF_TYPE_TIME_STAMP,
RINGBUF_TYPE_DATA,
};
unsigned ring_buffer_event_length(struct ring_buffer_event *event);
void *ring_buffer_event_data(struct ring_buffer_event *event);
/**
* ring_buffer_event_time_delta - return the delta timestamp of the event
* @event: the event to get the delta timestamp of
*
* The delta timestamp is the 27 bit timestamp since the last event.
*/
static inline unsigned
ring_buffer_event_time_delta(struct ring_buffer_event *event)
{
return event->time_delta;
}
/*
* size is in bytes for each per CPU buffer.
*/
struct ring_buffer *
ring_buffer_alloc(unsigned long size, unsigned flags);
void ring_buffer_free(struct ring_buffer *buffer);
int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size);
struct ring_buffer_event *ring_buffer_lock_reserve(struct ring_buffer *buffer,
unsigned long length);
int ring_buffer_unlock_commit(struct ring_buffer *buffer,
struct ring_buffer_event *event);
int ring_buffer_write(struct ring_buffer *buffer,
unsigned long length, void *data);
struct ring_buffer_event *
ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts);
struct ring_buffer_event *
ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts);
struct ring_buffer_iter *
ring_buffer_read_start(struct ring_buffer *buffer, int cpu);
void ring_buffer_read_finish(struct ring_buffer_iter *iter);
struct ring_buffer_event *
ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts);
struct ring_buffer_event *
ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts);
void ring_buffer_iter_reset(struct ring_buffer_iter *iter);
int ring_buffer_iter_empty(struct ring_buffer_iter *iter);
unsigned long ring_buffer_size(struct ring_buffer *buffer);
void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu);
void ring_buffer_reset(struct ring_buffer *buffer);
int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
struct ring_buffer *buffer_b, int cpu);
int ring_buffer_empty(struct ring_buffer *buffer);
int ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu);
void ring_buffer_record_disable(struct ring_buffer *buffer);
void ring_buffer_record_enable(struct ring_buffer *buffer);
void ring_buffer_record_disable_cpu(struct ring_buffer *buffer, int cpu);
void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu);
unsigned long ring_buffer_entries(struct ring_buffer *buffer);
unsigned long ring_buffer_overruns(struct ring_buffer *buffer);
unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu);
unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu);
u64 ring_buffer_time_stamp(int cpu);
void ring_buffer_normalize_time_stamp(int cpu, u64 *ts);
/*
* The below functions are fine to use outside the tracing facility.
*/
#ifdef CONFIG_RING_BUFFER
void tracing_on(void);
void tracing_off(void);
void tracing_off_permanent(void);
int tracing_is_on(void);
#else
static inline void tracing_on(void) { }
static inline void tracing_off(void) { }
static inline void tracing_off_permanent(void) { }
static inline int tracing_is_on(void) { return 0; }
#endif
void *ring_buffer_alloc_read_page(struct ring_buffer *buffer);
void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data);
int ring_buffer_read_page(struct ring_buffer *buffer,
void **data_page, int cpu, int full);
enum ring_buffer_flags {
RB_FL_OVERWRITE = 1 << 0,
};
#endif /* _LINUX_RING_BUFFER_H */
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