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bpf: introduce BPF_PROG_TYPE_PERF_EVENT program type

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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>
This commit is contained in:
Alexei Starovoitov
2016-09-01 18:37:22 -07:00
committed by David S. Miller
parent ea2e7ce5d0
commit 0515e5999a
5 changed files with 86 additions and 0 deletions
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5
include/linux/perf_event.h
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@@ -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
/*