tools/perf/lib/include/internal/mmap.h

   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 */