| #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> |
| #ifdef HAVE_AIO_SUPPORT |
| #include <aio.h> |
| #endif |
| #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); |
| #ifdef HAVE_AIO_SUPPORT |
| struct { |
| void **data; |
| struct aiocb *cblocks; |
| struct aiocb **aiocb; |
| int nr_cblocks; |
| } aio; |
| #endif |
| cpu_set_t affinity_mask; |
| u64 flush; |
| }; |
| |
| /* |
| * 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 { |
| BKW_MMAP_NOTREADY, |
| BKW_MMAP_RUNNING, |
| BKW_MMAP_DATA_PENDING, |
| BKW_MMAP_EMPTY, |
| }; |
| |
| struct mmap_params { |
| int prot, mask, nr_cblocks, affinity, flush; |
| 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)); |
| #ifdef HAVE_AIO_SUPPORT |
| int perf_mmap__aio_push(struct perf_mmap *md, void *to, int idx, |
| int push(void *to, struct aiocb *cblock, void *buf, size_t size, off_t off), |
| off_t *off); |
| #else |
| static inline int perf_mmap__aio_push(struct perf_mmap *md __maybe_unused, void *to __maybe_unused, int idx __maybe_unused, |
| int push(void *to, struct aiocb *cblock, void *buf, size_t size, off_t off) __maybe_unused, |
| off_t *off __maybe_unused) |
| { |
| return 0; |
| } |
| #endif |
| |
| 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 */ |