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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
// Copyright (c) 2021 Facebook
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bperf_u.h"
struct {
__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
__uint(key_size, sizeof(__u32));
__uint(value_size, sizeof(struct bpf_perf_event_value));
__uint(max_entries, 1);
} diff_readings SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
__uint(key_size, sizeof(__u32));
__uint(value_size, sizeof(struct bpf_perf_event_value));
__uint(max_entries, 1);
} accum_readings SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(key_size, sizeof(__u32));
__uint(value_size, sizeof(__u32));
} filter SEC(".maps");
enum bperf_filter_type type = 0;
int enabled = 0;
SEC("fexit/XXX")
int BPF_PROG(fexit_XXX)
{
struct bpf_perf_event_value *diff_val, *accum_val;
__u32 filter_key, zero = 0;
__u32 *accum_key;
if (!enabled)
return 0;
switch (type) {
case BPERF_FILTER_GLOBAL:
accum_key = &zero;
goto do_add;
case BPERF_FILTER_CPU:
filter_key = bpf_get_smp_processor_id();
break;
case BPERF_FILTER_PID:
filter_key = bpf_get_current_pid_tgid() & 0xffffffff;
break;
case BPERF_FILTER_TGID:
filter_key = bpf_get_current_pid_tgid() >> 32;
break;
default:
return 0;
}
accum_key = bpf_map_lookup_elem(&filter, &filter_key);
if (!accum_key)
return 0;
do_add:
diff_val = bpf_map_lookup_elem(&diff_readings, &zero);
if (!diff_val)
return 0;
accum_val = bpf_map_lookup_elem(&accum_readings, accum_key);
if (!accum_val)
return 0;
accum_val->counter += diff_val->counter;
accum_val->enabled += diff_val->enabled;
accum_val->running += diff_val->running;
return 0;
}
char LICENSE[] SEC("license") = "Dual BSD/GPL";
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