diff options
| author | Daniel Borkmann <daniel@iogearbox.net> | 2016-07-14 18:08:04 +0200 |
|---|---|---|
| committer | Michael Bestas <mkbestas@lineageos.org> | 2022-04-19 00:50:37 +0300 |
| commit | 4fd9231d11ea797ecb039240b66dc8f9ba0c4790 (patch) | |
| tree | d7e03b3c5b03f4e22e087beae0819ca0a2e6d8bb | |
| parent | 8b0bd6001fe300362bfc85ec3b6b08574f654e69 (diff) | |
bpf, perf: split bpf_perf_event_output
Split the bpf_perf_event_output() helper as a preparation into
two parts. The new bpf_perf_event_output() will prepare the raw
record itself and test for unknown flags from BPF trace context,
where the __bpf_perf_event_output() does the core work. The
latter will be reused later on from bpf_event_output() directly.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Chatur27 <jasonbright2709@gmail.com>
| -rw-r--r-- | kernel/trace/bpf_trace.c | 33 |
1 files changed, 22 insertions, 11 deletions
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 074d59443259..dec099cf370b 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -279,23 +279,16 @@ static const struct bpf_func_proto bpf_perf_event_read_proto = { .arg2_type = ARG_ANYTHING, }; -static u64 bpf_perf_event_output(u64 r1, u64 r2, u64 flags, u64 r4, u64 size) +static __always_inline u64 +__bpf_perf_event_output(struct pt_regs *regs, struct bpf_map *map, + u64 flags, struct perf_raw_record *raw) { - struct pt_regs *regs = (struct pt_regs *) (long) r1; - struct bpf_map *map = (struct bpf_map *) (long) r2; struct bpf_array *array = container_of(map, struct bpf_array, map); u64 index = flags & BPF_F_INDEX_MASK; - void *data = (void *) (long) r4; struct perf_sample_data sample_data; struct bpf_event_entry *ee; struct perf_event *event; - struct perf_raw_record raw = { - .size = size, - .data = data, - }; - if (unlikely(flags & ~(BPF_F_INDEX_MASK))) - return -EINVAL; if (index == BPF_F_CURRENT_CPU) index = raw_smp_processor_id(); if (unlikely(index >= array->map.max_entries)) @@ -314,11 +307,29 @@ static u64 bpf_perf_event_output(u64 r1, u64 r2, u64 flags, u64 r4, u64 size) return -EOPNOTSUPP; perf_sample_data_init(&sample_data, 0, 0); - sample_data.raw = &raw; + sample_data.raw = raw; perf_event_output(event, &sample_data, regs); return 0; } +static u64 bpf_perf_event_output(u64 r1, u64 r2, u64 flags, u64 r4, u64 size) +{ + struct pt_regs *regs = (struct pt_regs *)(long) r1; + struct bpf_map *map = (struct bpf_map *)(long) r2; + void *data = (void *)(long) r4; + struct perf_raw_record raw = { + .frag = { + .size = size, + .data = data, + }, + }; + + if (unlikely(flags & ~(BPF_F_INDEX_MASK))) + return -EINVAL; + + return __bpf_perf_event_output(regs, map, flags, &raw); +} + static const struct bpf_func_proto bpf_perf_event_output_proto = { .func = bpf_perf_event_output, .gpl_only = true, |