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d6a735ef32
Some helper functions will be used for cgroup counting too. Move them
to a header file for sharing.
Committer notes:
Fix the build on older systems with:
- struct bpf_map_info map_info = {0};
+ struct bpf_map_info map_info = { .id = 0, };
This wasn't breaking the build in such systems as bpf_counter.c isn't
built due to:
tools/perf/util/Build:
perf-$(CONFIG_PERF_BPF_SKEL) += bpf_counter.o
The bpf_counter.h file on the other hand is included from places that
are built everywhere.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20210625071826.608504-4-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
132 lines
3.0 KiB
C
132 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PERF_BPF_COUNTER_H
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#define __PERF_BPF_COUNTER_H 1
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#include <linux/list.h>
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#include <sys/resource.h>
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#include <bpf/bpf.h>
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#include <bpf/btf.h>
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#include <bpf/libbpf.h>
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struct evsel;
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struct target;
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struct bpf_counter;
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typedef int (*bpf_counter_evsel_op)(struct evsel *evsel);
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typedef int (*bpf_counter_evsel_target_op)(struct evsel *evsel,
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struct target *target);
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typedef int (*bpf_counter_evsel_install_pe_op)(struct evsel *evsel,
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int cpu,
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int fd);
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struct bpf_counter_ops {
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bpf_counter_evsel_target_op load;
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bpf_counter_evsel_op enable;
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bpf_counter_evsel_op disable;
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bpf_counter_evsel_op read;
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bpf_counter_evsel_op destroy;
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bpf_counter_evsel_install_pe_op install_pe;
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};
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struct bpf_counter {
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void *skel;
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struct list_head list;
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};
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#ifdef HAVE_BPF_SKEL
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int bpf_counter__load(struct evsel *evsel, struct target *target);
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int bpf_counter__enable(struct evsel *evsel);
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int bpf_counter__disable(struct evsel *evsel);
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int bpf_counter__read(struct evsel *evsel);
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void bpf_counter__destroy(struct evsel *evsel);
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int bpf_counter__install_pe(struct evsel *evsel, int cpu, int fd);
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#else /* HAVE_BPF_SKEL */
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#include <linux/err.h>
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static inline int bpf_counter__load(struct evsel *evsel __maybe_unused,
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struct target *target __maybe_unused)
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{
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return 0;
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}
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static inline int bpf_counter__enable(struct evsel *evsel __maybe_unused)
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{
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return 0;
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}
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static inline int bpf_counter__disable(struct evsel *evsel __maybe_unused)
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{
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return 0;
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}
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static inline int bpf_counter__read(struct evsel *evsel __maybe_unused)
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{
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return -EAGAIN;
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}
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static inline void bpf_counter__destroy(struct evsel *evsel __maybe_unused)
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{
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}
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static inline int bpf_counter__install_pe(struct evsel *evsel __maybe_unused,
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int cpu __maybe_unused,
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int fd __maybe_unused)
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{
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return 0;
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}
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#endif /* HAVE_BPF_SKEL */
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static inline void set_max_rlimit(void)
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{
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struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
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setrlimit(RLIMIT_MEMLOCK, &rinf);
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}
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static inline __u32 bpf_link_get_id(int fd)
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{
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struct bpf_link_info link_info = { .id = 0, };
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__u32 link_info_len = sizeof(link_info);
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bpf_obj_get_info_by_fd(fd, &link_info, &link_info_len);
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return link_info.id;
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}
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static inline __u32 bpf_link_get_prog_id(int fd)
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{
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struct bpf_link_info link_info = { .id = 0, };
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__u32 link_info_len = sizeof(link_info);
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bpf_obj_get_info_by_fd(fd, &link_info, &link_info_len);
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return link_info.prog_id;
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}
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static inline __u32 bpf_map_get_id(int fd)
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{
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struct bpf_map_info map_info = { .id = 0, };
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__u32 map_info_len = sizeof(map_info);
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bpf_obj_get_info_by_fd(fd, &map_info, &map_info_len);
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return map_info.id;
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}
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/* trigger the leader program on a cpu */
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static inline int bperf_trigger_reading(int prog_fd, int cpu)
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{
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DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
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.ctx_in = NULL,
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.ctx_size_in = 0,
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.flags = BPF_F_TEST_RUN_ON_CPU,
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.cpu = cpu,
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.retval = 0,
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);
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return bpf_prog_test_run_opts(prog_fd, &opts);
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}
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#endif /* __PERF_BPF_COUNTER_H */
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