1 #ifndef __PERF_MMAP_H 2 #define __PERF_MMAP_H 1 3 4 #include <linux/compiler.h> 5 #include <linux/refcount.h> 6 #include <linux/types.h> 7 #include <linux/ring_buffer.h> 8 #include <stdbool.h> 9 #ifdef HAVE_AIO_SUPPORT 10 #include <aio.h> 11 #endif 12 #include "auxtrace.h" 13 #include "event.h" 14 15 struct aiocb; 16 /** 17 * struct perf_mmap - perf's ring buffer mmap details 18 * 19 * @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this 20 */ 21 struct perf_mmap { 22 void *base; 23 int mask; 24 int fd; 25 int cpu; 26 refcount_t refcnt; 27 u64 prev; 28 u64 start; 29 u64 end; 30 bool overwrite; 31 struct auxtrace_mmap auxtrace_mmap; 32 char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8); 33 #ifdef HAVE_AIO_SUPPORT 34 struct { 35 void **data; 36 struct aiocb *cblocks; 37 struct aiocb **aiocb; 38 int nr_cblocks; 39 } aio; 40 #endif 41 cpu_set_t affinity_mask; 42 u64 flush; 43 void *data; 44 int comp_level; 45 }; 46 47 /* 48 * State machine of bkw_mmap_state: 49 * 50 * .________________(forbid)_____________. 51 * | V 52 * NOTREADY --(0)--> RUNNING --(1)--> DATA_PENDING --(2)--> EMPTY 53 * ^ ^ | ^ | 54 * | |__(forbid)____/ |___(forbid)___/| 55 * | | 56 * \_________________(3)_______________/ 57 * 58 * NOTREADY : Backward ring buffers are not ready 59 * RUNNING : Backward ring buffers are recording 60 * DATA_PENDING : We are required to collect data from backward ring buffers 61 * EMPTY : We have collected data from backward ring buffers. 62 * 63 * (0): Setup backward ring buffer 64 * (1): Pause ring buffers for reading 65 * (2): Read from ring buffers 66 * (3): Resume ring buffers for recording 67 */ 68 enum bkw_mmap_state { 69 BKW_MMAP_NOTREADY, 70 BKW_MMAP_RUNNING, 71 BKW_MMAP_DATA_PENDING, 72 BKW_MMAP_EMPTY, 73 }; 74 75 struct mmap_params { 76 int prot, mask, nr_cblocks, affinity, flush, comp_level; 77 struct auxtrace_mmap_params auxtrace_mp; 78 }; 79 80 int perf_mmap__mmap(struct perf_mmap *map, struct mmap_params *mp, int fd, int cpu); 81 void perf_mmap__munmap(struct perf_mmap *map); 82 83 void perf_mmap__get(struct perf_mmap *map); 84 void perf_mmap__put(struct perf_mmap *map); 85 86 void perf_mmap__consume(struct perf_mmap *map); 87 88 static inline u64 perf_mmap__read_head(struct perf_mmap *mm) 89 { 90 return ring_buffer_read_head(mm->base); 91 } 92 93 static inline void perf_mmap__write_tail(struct perf_mmap *md, u64 tail) 94 { 95 ring_buffer_write_tail(md->base, tail); 96 } 97 98 union perf_event *perf_mmap__read_forward(struct perf_mmap *map); 99 100 union perf_event *perf_mmap__read_event(struct perf_mmap *map); 101 102 int perf_mmap__push(struct perf_mmap *md, void *to, 103 int push(struct perf_mmap *map, void *to, void *buf, size_t size)); 104 105 size_t perf_mmap__mmap_len(struct perf_mmap *map); 106 107 int perf_mmap__read_init(struct perf_mmap *md); 108 void perf_mmap__read_done(struct perf_mmap *map); 109 #endif /*__PERF_MMAP_H */ 110