1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LIBPERF_INTERNAL_MMAP_H 3 #define __LIBPERF_INTERNAL_MMAP_H 4 5 #include <linux/compiler.h> 6 #include <linux/refcount.h> 7 #include <linux/types.h> 8 #include <stdbool.h> 9 10 /* perf sample has 16 bits size limit */ 11 #define PERF_SAMPLE_MAX_SIZE (1 << 16) 12 13 struct perf_mmap; 14 15 typedef void (*libperf_unmap_cb_t)(struct perf_mmap *map); 16 17 /** 18 * struct perf_mmap - perf's ring buffer mmap details 19 * 20 * @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this 21 */ 22 struct perf_mmap { 23 void *base; 24 int mask; 25 int fd; 26 int cpu; 27 refcount_t refcnt; 28 u64 prev; 29 u64 start; 30 u64 end; 31 bool overwrite; 32 u64 flush; 33 libperf_unmap_cb_t unmap_cb; 34 char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8); 35 struct perf_mmap *next; 36 }; 37 38 struct perf_mmap_param { 39 int prot; 40 int mask; 41 }; 42 43 size_t perf_mmap__mmap_len(struct perf_mmap *map); 44 45 void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev, 46 bool overwrite, libperf_unmap_cb_t unmap_cb); 47 int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp, 48 int fd, int cpu); 49 void perf_mmap__munmap(struct perf_mmap *map); 50 void perf_mmap__get(struct perf_mmap *map); 51 void perf_mmap__put(struct perf_mmap *map); 52 53 u64 perf_mmap__read_head(struct perf_mmap *map); 54 55 #endif /* __LIBPERF_INTERNAL_MMAP_H */ 56