perf/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 #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         void                    *event_copy;
  37         size_t                   event_copy_sz;
  38         struct perf_mmap        *next;
  39 };
  40
  41 struct perf_mmap_param {
  42         int     prot;
  43         int     mask;
  44 };
  45
  46 size_t perf_mmap__mmap_len(struct perf_mmap *map);
  47
  48 void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,
  49                      bool overwrite, libperf_unmap_cb_t unmap_cb);
  50 int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
  51                     int fd, struct perf_cpu cpu);
  52 void perf_mmap__munmap(struct perf_mmap *map);
  53 void perf_mmap__get(struct perf_mmap *map);
  54 void perf_mmap__put(struct perf_mmap *map);
  55
  56 u64 perf_mmap__read_head(struct perf_mmap *map);
  57
  58 int perf_mmap__read_self(struct perf_mmap *map, struct perf_counts_values *count);
  59
  60 #endif /* __LIBPERF_INTERNAL_MMAP_H */