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perf util: Move bpf_perf definitions to a libperf header

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By following the same protocol, other tools can share hardware PMCs with
perf. Move perf_event_attr_map_entry and BPF_PERF_DEFAULT_ATTR_MAP_PATH to
bpf_perf.h for other tools to use.

Signed-off-by: Song Liu <song@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: kernel-team@fb.com
Link: https://lore.kernel.org/r/20210425214333.1090950-2-song@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Song Liu 2021-04-25 14:43:29 -07:00 • committed by Arnaldo Carvalho de Melo
parent 26bda3ca19
commit ec8149fba6
2 changed files with 34 additions and 24 deletions
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31
tools/lib/perf/include/perf/bpf_perf.h Normal file
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/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
#ifndef __LIBPERF_BPF_PERF_H
#define __LIBPERF_BPF_PERF_H
#include <linux/types.h> /* for __u32 */
/*
* bpf_perf uses a hashmap, the attr_map, to track all the leader programs.
* The hashmap is pinned in bpffs. flock() on this file is used to ensure
* no concurrent access to the attr_map. The key of attr_map is struct
* perf_event_attr, and the value is struct perf_event_attr_map_entry.
*
* struct perf_event_attr_map_entry contains two __u32 IDs, bpf_link of the
* leader prog, and the diff_map. Each perf-stat session holds a reference
* to the bpf_link to make sure the leader prog is attached to sched_switch
* tracepoint.
*
* Since the hashmap only contains IDs of the bpf_link and diff_map, it
* does not hold any references to the leader program. Once all perf-stat
* sessions of these events exit, the leader prog, its maps, and the
* perf_events will be freed.
*/
struct perf_event_attr_map_entry {
__u32 link_id;
__u32 diff_map_id;
};
/* default attr_map name */
#define BPF_PERF_DEFAULT_ATTR_MAP_PATH "perf_attr_map"
#endif /* __LIBPERF_BPF_PERF_H */