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 #include <internal/cpumap.h> 10 11 /* perf sample has 16 bits size limit */ 12 #define PERF_SAMPLE_MAX_SIZE (1 << 16) 13 14 struct perf_mmap; 15 struct perf_counts_values; 16 17 typedef void (*libperf_unmap_cb_t)(struct perf_mmap *map); 18 19 /** 20 * struct perf_mmap - perf's ring buffer mmap details 21 * 22 * @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this 23 */ 24 struct perf_mmap { 25 void *base; 26 int mask; 27 int fd; 28 struct perf_cpu cpu; 29 refcount_t refcnt; 30 u64 prev; 31 u64 start; 32 u64 end; 33 bool overwrite; 34 u64 flush; 35 libperf_unmap_cb_t unmap_cb; 36 char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8); 37 struct perf_mmap *next; 38 }; 39 40 struct perf_mmap_param { 41 int prot; 42 int mask; 43 }; 44 45 size_t perf_mmap__mmap_len(struct perf_mmap *map); 46 47 void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev, 48 bool overwrite, libperf_unmap_cb_t unmap_cb); 49 int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp, 50 int fd, struct perf_cpu cpu); 51 void perf_mmap__munmap(struct perf_mmap *map); 52 void perf_mmap__get(struct perf_mmap *map); 53 void perf_mmap__put(struct perf_mmap *map); 54 55 u64 perf_mmap__read_head(struct perf_mmap *map); 56 57 int perf_mmap__read_self(struct perf_mmap *map, struct perf_counts_values *count); 58 59 #endif /* __LIBPERF_INTERNAL_MMAP_H */ 60