blob: 274ce389cd84891f0c97bf3184460e72a108912b [file] [log] [blame]
#ifndef __PERF_MMAP_H
#define __PERF_MMAP_H 1
#include <linux/compiler.h>
#include <linux/refcount.h>
#include <linux/types.h>
#include <linux/ring_buffer.h>
#include <stdbool.h>
#include <aio.h>
#include "auxtrace.h"
#include "event.h"
struct aiocb;
* struct perf_mmap - perf's ring buffer mmap details
* @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this
struct perf_mmap {
void *base;
int mask;
int fd;
int cpu;
refcount_t refcnt;
u64 prev;
u64 start;
u64 end;
bool overwrite;
struct auxtrace_mmap auxtrace_mmap;
char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
struct {
void **data;
struct aiocb *cblocks;
struct aiocb **aiocb;
int nr_cblocks;
} aio;
cpu_set_t affinity_mask;
u64 flush;
void *data;
int comp_level;
* State machine of bkw_mmap_state:
* .________________(forbid)_____________.
* | V
* NOTREADY --(0)--> RUNNING --(1)--> DATA_PENDING --(2)--> EMPTY
* ^ ^ | ^ |
* | |__(forbid)____/ |___(forbid)___/|
* | |
* \_________________(3)_______________/
* NOTREADY : Backward ring buffers are not ready
* RUNNING : Backward ring buffers are recording
* DATA_PENDING : We are required to collect data from backward ring buffers
* EMPTY : We have collected data from backward ring buffers.
* (0): Setup backward ring buffer
* (1): Pause ring buffers for reading
* (2): Read from ring buffers
* (3): Resume ring buffers for recording
enum bkw_mmap_state {
struct mmap_params {
int prot, mask, nr_cblocks, affinity, flush, comp_level;
struct auxtrace_mmap_params auxtrace_mp;
int perf_mmap__mmap(struct perf_mmap *map, struct mmap_params *mp, int fd, int cpu);
void perf_mmap__munmap(struct perf_mmap *map);
void perf_mmap__get(struct perf_mmap *map);
void perf_mmap__put(struct perf_mmap *map);
void perf_mmap__consume(struct perf_mmap *map);
static inline u64 perf_mmap__read_head(struct perf_mmap *mm)
return ring_buffer_read_head(mm->base);
static inline void perf_mmap__write_tail(struct perf_mmap *md, u64 tail)
ring_buffer_write_tail(md->base, tail);
union perf_event *perf_mmap__read_forward(struct perf_mmap *map);
union perf_event *perf_mmap__read_event(struct perf_mmap *map);
int perf_mmap__push(struct perf_mmap *md, void *to,
int push(struct perf_mmap *map, void *to, void *buf, size_t size));
size_t perf_mmap__mmap_len(struct perf_mmap *map);
int perf_mmap__read_init(struct perf_mmap *md);
void perf_mmap__read_done(struct perf_mmap *map);
#endif /*__PERF_MMAP_H */