diff options
| author | Alexei Starovoitov <ast@fb.com> | 2016-09-01 18:37:22 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-09-02 10:46:44 -0700 |
| commit | 0515e5999a466dfe6e1924f460da599bb6821487 (patch) | |
| tree | e4ba954bea80d223248c57885019b7620375164a /include | |
| parent | ea2e7ce5d0fc878463ba39deb46cf2ab20398fd2 (diff) | |
| download | linux-0515e5999a466dfe6e1924f460da599bb6821487.tar.bz2 | |
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')
| -rw-r--r-- | include/linux/perf_event.h | 5 | ||||
| -rw-r--r-- | include/uapi/linux/Kbuild | 1 | ||||
| -rw-r--r-- | include/uapi/linux/bpf.h | 1 | ||||
| -rw-r--r-- | include/uapi/linux/bpf_perf_event.h | 18 |
4 files changed, 25 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 /* diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild index 185f8ea2702f..d0352a971ebd 100644 --- a/include/uapi/linux/Kbuild +++ b/include/uapi/linux/Kbuild @@ -71,6 +71,7 @@ header-y += binfmts.h header-y += blkpg.h header-y += blktrace_api.h header-y += bpf_common.h +header-y += bpf_perf_event.h header-y += bpf.h header-y += bpqether.h header-y += bsg.h diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index e4c5a1baa993..f896dfac4ac0 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -95,6 +95,7 @@ enum bpf_prog_type { BPF_PROG_TYPE_SCHED_ACT, BPF_PROG_TYPE_TRACEPOINT, BPF_PROG_TYPE_XDP, + BPF_PROG_TYPE_PERF_EVENT, }; #define BPF_PSEUDO_MAP_FD 1 diff --git a/include/uapi/linux/bpf_perf_event.h b/include/uapi/linux/bpf_perf_event.h new file mode 100644 index 000000000000..067427259820 --- /dev/null +++ b/include/uapi/linux/bpf_perf_event.h @@ -0,0 +1,18 @@ +/* Copyright (c) 2016 Facebook + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + */ +#ifndef _UAPI__LINUX_BPF_PERF_EVENT_H__ +#define _UAPI__LINUX_BPF_PERF_EVENT_H__ + +#include <linux/types.h> +#include <linux/ptrace.h> + +struct bpf_perf_event_data { + struct pt_regs regs; + __u64 sample_period; +}; + +#endif /* _UAPI__LINUX_BPF_PERF_EVENT_H__ */ |