Quelle ring_buffer.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_RING_BUFFER_H
#define _LINUX_RING_BUFFER_H

#include <linux/mm.h>
#include <linux/seq_file.h>
#include <linux/poll.h>

#include <uapi/linux/trace_mmap.h>

struct trace_buffer;
struct ring_buffer_iter;

/*
* Don't refer to this struct directly, use functions below.
*/
struct ring_buffer_event {
u32  type_len:5, time_delta:27;

u32  array[];
};

/**
* enum ring_buffer_type - internal ring buffer types
*
* @RINGBUF_TYPE_PADDING: Left over page padding or discarded event
* If time_delta is 0:
*   array is ignored
*   size is variable depending on how much
*   padding is needed
* If time_delta is non zero:
*   array[0] holds the actual length
*   size = 4 + length (bytes)
*
* @RINGBUF_TYPE_TIME_EXTEND: Extend the time delta
* array[0] = time delta (28 .. 59)
* size = 8 bytes
*
* @RINGBUF_TYPE_TIME_STAMP: Absolute timestamp
* Same format as TIME_EXTEND except that the
* value is an absolute timestamp, not a delta
* event.time_delta contains bottom 27 bits
* array[0] = top (28 .. 59) bits
* size = 8 bytes
*
* <= @RINGBUF_TYPE_DATA_TYPE_LEN_MAX:
* Data record
* If type_len is zero:
*   array[0] holds the actual length
*   array[1..(length+3)/4] holds data
*   size = 4 + length (bytes)
* else
*   length = type_len << 2
*   array[0..(length+3)/4-1] holds data
*   size = 4 + length (bytes)
*/
enum ring_buffer_type {
RINGBUF_TYPE_DATA_TYPE_LEN_MAX = 28,
RINGBUF_TYPE_PADDING,
RINGBUF_TYPE_TIME_EXTEND,
RINGBUF_TYPE_TIME_STAMP,
};

unsigned ring_buffer_event_length(struct ring_buffer_event *event);
void *ring_buffer_event_data(struct ring_buffer_event *event);
u64 ring_buffer_event_time_stamp(struct trace_buffer *buffer,
     struct ring_buffer_event *event);

/*
* ring_buffer_discard_commit will remove an event that has not
*   been committed yet. If this is used, then ring_buffer_unlock_commit
*   must not be called on the discarded event. This function
*   will try to remove the event from the ring buffer completely
*   if another event has not been written after it.
*
* Example use:
*
*  if (some_condition)
*    ring_buffer_discard_commit(buffer, event);
*  else
*    ring_buffer_unlock_commit(buffer, event);
*/
void ring_buffer_discard_commit(struct trace_buffer *buffer,
    struct ring_buffer_event *event);

/*
* size is in bytes for each per CPU buffer.
*/
struct trace_buffer *
__ring_buffer_alloc(unsigned long size, unsigned flags, struct lock_class_key *key);

struct trace_buffer *__ring_buffer_alloc_range(unsigned long size, unsigned flags,
            int order, unsigned long start,
            unsigned long range_size,
            unsigned long scratch_size,
            struct lock_class_key *key);

void *ring_buffer_meta_scratch(struct trace_buffer *buffer, unsigned int *size);

/*
* Because the ring buffer is generic, if other users of the ring buffer get
* traced by ftrace, it can produce lockdep warnings. We need to keep each
* ring buffer's lock class separate.
*/
#define ring_buffer_alloc(size, flags)   \
({       \
static struct lock_class_key __key;  \
__ring_buffer_alloc((size), (flags), &__key); \
})

/*
* Because the ring buffer is generic, if other users of the ring buffer get
* traced by ftrace, it can produce lockdep warnings. We need to keep each
* ring buffer's lock class separate.
*/
#define ring_buffer_alloc_range(size, flags, order, start, range_size, s_size) \
({         \
static struct lock_class_key __key;    \
__ring_buffer_alloc_range((size), (flags), (order), (start), \
      (range_size), (s_size), &__key); \
})

typedef bool (*ring_buffer_cond_fn)(void *data);
int ring_buffer_wait(struct trace_buffer *buffer, int cpu, int full,
       ring_buffer_cond_fn cond, void *data);
__poll_t ring_buffer_poll_wait(struct trace_buffer *buffer, int cpu,
     struct file *filp, poll_table *poll_table, int full);
void ring_buffer_wake_waiters(struct trace_buffer *buffer, int cpu);

#define RING_BUFFER_ALL_CPUS -1

void ring_buffer_free(struct trace_buffer *buffer);

int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size, int cpu);

void ring_buffer_change_overwrite(struct trace_buffer *buffer, int val);

struct ring_buffer_event *ring_buffer_lock_reserve(struct trace_buffer *buffer,
         unsigned long length);
int ring_buffer_unlock_commit(struct trace_buffer *buffer);
int ring_buffer_write(struct trace_buffer *buffer,
        unsigned long length, void *data);

void ring_buffer_nest_start(struct trace_buffer *buffer);
void ring_buffer_nest_end(struct trace_buffer *buffer);

DEFINE_GUARD(ring_buffer_nest, struct trace_buffer *,
      ring_buffer_nest_start(_T), ring_buffer_nest_end(_T))

struct ring_buffer_event *
ring_buffer_peek(struct trace_buffer *buffer, int cpu, u64 *ts,
   unsigned long *lost_events);
struct ring_buffer_event *
ring_buffer_consume(struct trace_buffer *buffer, int cpu, u64 *ts,
      unsigned long *lost_events);

struct ring_buffer_iter *
ring_buffer_read_start(struct trace_buffer *buffer, int cpu, gfp_t flags);
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);
void ring_buffer_iter_advance(struct ring_buffer_iter *iter);
void ring_buffer_iter_reset(struct ring_buffer_iter *iter);
int ring_buffer_iter_empty(struct ring_buffer_iter *iter);
bool ring_buffer_iter_dropped(struct ring_buffer_iter *iter);

unsigned long ring_buffer_size(struct trace_buffer *buffer, int cpu);
unsigned long ring_buffer_max_event_size(struct trace_buffer *buffer);

void ring_buffer_reset_cpu(struct trace_buffer *buffer, int cpu);
void ring_buffer_reset_online_cpus(struct trace_buffer *buffer);
void ring_buffer_reset(struct trace_buffer *buffer);

#ifdef CONFIG_RING_BUFFER_ALLOW_SWAP
int ring_buffer_swap_cpu(struct trace_buffer *buffer_a,
    struct trace_buffer *buffer_b, int cpu);
#else
static inline int
ring_buffer_swap_cpu(struct trace_buffer *buffer_a,
       struct trace_buffer *buffer_b, int cpu)
{
return -ENODEV;
}
#endif

bool ring_buffer_empty(struct trace_buffer *buffer);
bool ring_buffer_empty_cpu(struct trace_buffer *buffer, int cpu);

void ring_buffer_record_disable(struct trace_buffer *buffer);
void ring_buffer_record_enable(struct trace_buffer *buffer);
void ring_buffer_record_off(struct trace_buffer *buffer);
void ring_buffer_record_on(struct trace_buffer *buffer);
bool ring_buffer_record_is_on(struct trace_buffer *buffer);
bool ring_buffer_record_is_set_on(struct trace_buffer *buffer);
bool ring_buffer_record_is_on_cpu(struct trace_buffer *buffer, int cpu);
void ring_buffer_record_disable_cpu(struct trace_buffer *buffer, int cpu);
void ring_buffer_record_enable_cpu(struct trace_buffer *buffer, int cpu);

u64 ring_buffer_oldest_event_ts(struct trace_buffer *buffer, int cpu);
unsigned long ring_buffer_bytes_cpu(struct trace_buffer *buffer, int cpu);
unsigned long ring_buffer_entries(struct trace_buffer *buffer);
unsigned long ring_buffer_overruns(struct trace_buffer *buffer);
unsigned long ring_buffer_entries_cpu(struct trace_buffer *buffer, int cpu);
unsigned long ring_buffer_overrun_cpu(struct trace_buffer *buffer, int cpu);
unsigned long ring_buffer_commit_overrun_cpu(struct trace_buffer *buffer, int cpu);
unsigned long ring_buffer_dropped_events_cpu(struct trace_buffer *buffer, int cpu);
unsigned long ring_buffer_read_events_cpu(struct trace_buffer *buffer, int cpu);

u64 ring_buffer_time_stamp(struct trace_buffer *buffer);
void ring_buffer_normalize_time_stamp(struct trace_buffer *buffer,
          int cpu, u64 *ts);
void ring_buffer_set_clock(struct trace_buffer *buffer,
      u64 (*clock)(void));
void ring_buffer_set_time_stamp_abs(struct trace_buffer *buffer, bool abs);
bool ring_buffer_time_stamp_abs(struct trace_buffer *buffer);

size_t ring_buffer_nr_dirty_pages(struct trace_buffer *buffer, int cpu);

struct buffer_data_read_page;
struct buffer_data_read_page *
ring_buffer_alloc_read_page(struct trace_buffer *buffer, int cpu);
void ring_buffer_free_read_page(struct trace_buffer *buffer, int cpu,
    struct buffer_data_read_page *page);
int ring_buffer_read_page(struct trace_buffer *buffer,
     struct buffer_data_read_page *data_page,
     size_t len, int cpu, int full);
void *ring_buffer_read_page_data(struct buffer_data_read_page *page);

struct trace_seq;

int ring_buffer_print_entry_header(struct trace_seq *s);
int ring_buffer_print_page_header(struct trace_buffer *buffer, struct trace_seq *s);

int ring_buffer_subbuf_order_get(struct trace_buffer *buffer);
int ring_buffer_subbuf_order_set(struct trace_buffer *buffer, int order);
int ring_buffer_subbuf_size_get(struct trace_buffer *buffer);

enum ring_buffer_flags {
RB_FL_OVERWRITE  = 1 << 0,
};

#ifdef CONFIG_RING_BUFFER
int trace_rb_cpu_prepare(unsigned int cpu, struct hlist_node *node);
#else
#define trace_rb_cpu_prepare NULL
#endif

int ring_buffer_map(struct trace_buffer *buffer, int cpu,
      struct vm_area_struct *vma);
int ring_buffer_unmap(struct trace_buffer *buffer, int cpu);
int ring_buffer_map_get_reader(struct trace_buffer *buffer, int cpu);
#endif /* _LINUX_RING_BUFFER_H */

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