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 struct perf_counts_values; 15 16 typedef void (*libperf_unmap_cb_t)(struct perf_mmap *map); 17 18 /** 19 * struct perf_mmap - perf's ring buffer mmap details 20 * 21 * @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this 22 */ 23 struct perf_mmap { 24 void *base; 25 int mask; 26 int fd; 27 int cpu; 28 refcount_t refcnt; 29 u64 prev; 30 u64 start; 31 u64 end; 32 bool overwrite; 33 u64 flush; 34 libperf_unmap_cb_t unmap_cb; 35 char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8); 36 struct perf_mmap *next; 37 }; 38 39 struct perf_mmap_param { 40 int prot; 41 int mask; 42 }; 43 44 size_t perf_mmap__mmap_len(struct perf_mmap *map); 45 46 void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev, 47 bool overwrite, libperf_unmap_cb_t unmap_cb); 48 int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp, 49 int fd, int cpu); 50 void perf_mmap__munmap(struct perf_mmap *map); 51 void perf_mmap__get(struct perf_mmap *map); 52 void perf_mmap__put(struct perf_mmap *map); 53 54 u64 perf_mmap__read_head(struct perf_mmap *map); 55 56 int perf_mmap__read_self(struct perf_mmap *map, struct perf_counts_values *count); 57 58 #endif /* __LIBPERF_INTERNAL_MMAP_H */ 59