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authorAlexei Starovoitov <ast@fb.com>2016-09-02 04:37:22 +0300
committerDavid S. Miller <davem@davemloft.net>2016-09-02 20:46:44 +0300
commit0515e5999a466dfe6e1924f460da599bb6821487 (patch)
treee4ba954bea80d223248c57885019b7620375164a /include/linux/perf_event.h
parentea2e7ce5d0fc878463ba39deb46cf2ab20398fd2 (diff)
downloadlinux-0515e5999a466dfe6e1924f460da599bb6821487.tar.xz
bpf: introduce BPF_PROG_TYPE_PERF_EVENT program type
Introduce BPF_PROG_TYPE_PERF_EVENT programs that can be attached to HW and SW perf events (PERF_TYPE_HARDWARE and PERF_TYPE_SOFTWARE correspondingly in uapi/linux/perf_event.h) The program visible context meta structure is struct bpf_perf_event_data { struct pt_regs regs; __u64 sample_period; }; which is accessible directly from the program: int bpf_prog(struct bpf_perf_event_data *ctx) { ... ctx->sample_period ... ... ctx->regs.ip ... } The bpf verifier rewrites the accesses into kernel internal struct bpf_perf_event_data_kern which allows changing struct perf_sample_data without affecting bpf programs. New fields can be added to the end of struct bpf_perf_event_data in the future. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/perf_event.h')
-rw-r--r--include/linux/perf_event.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 2b6b43cc0dd5..97bfe62f30d7 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -788,6 +788,11 @@ struct perf_output_handle {
int page;
};
+struct bpf_perf_event_data_kern {
+ struct pt_regs *regs;
+ struct perf_sample_data *data;
+};
+
#ifdef CONFIG_CGROUP_PERF
/*