/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LIBPERF_INTERNAL_MMAP_H
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#define __LIBPERF_INTERNAL_MMAP_H
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#include <linux/compiler.h>
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#include <linux/refcount.h>
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#include <linux/types.h>
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#include <stdbool.h>
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/* perf sample has 16 bits size limit */
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#define PERF_SAMPLE_MAX_SIZE (1 << 16)
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struct perf_mmap;
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typedef void (*libperf_unmap_cb_t)(struct perf_mmap *map);
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/**
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* struct perf_mmap - perf's ring buffer mmap details
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*
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* @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this
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*/
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struct perf_mmap {
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void *base;
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int mask;
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int fd;
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int cpu;
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refcount_t refcnt;
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u64 prev;
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u64 start;
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u64 end;
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bool overwrite;
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u64 flush;
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libperf_unmap_cb_t unmap_cb;
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char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
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struct perf_mmap *next;
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};
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struct perf_mmap_param {
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int prot;
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int mask;
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};
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size_t perf_mmap__mmap_len(struct perf_mmap *map);
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void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,
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bool overwrite, libperf_unmap_cb_t unmap_cb);
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int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
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int fd, int cpu);
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void perf_mmap__munmap(struct perf_mmap *map);
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void perf_mmap__get(struct perf_mmap *map);
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void perf_mmap__put(struct perf_mmap *map);
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u64 perf_mmap__read_head(struct perf_mmap *map);
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#endif /* __LIBPERF_INTERNAL_MMAP_H */
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