Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* Copyright 2016 Netflix, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * This program is free software; you can redistribute it and/or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * modify it under the terms of version 2 of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * License as published by the Free Software Foundation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/version.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <uapi/linux/bpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <uapi/linux/bpf_perf_event.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <bpf/bpf_helpers.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <bpf/bpf_tracing.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define MAX_IPS		8192
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	__uint(type, BPF_MAP_TYPE_HASH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	__type(key, u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	__type(value, u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	__uint(max_entries, MAX_IPS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) } ip_map SEC(".maps");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) SEC("perf_event")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) int do_sample(struct bpf_perf_event_data *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	u64 ip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	u32 *value, init_val = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	ip = PT_REGS_IP(&ctx->regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	value = bpf_map_lookup_elem(&ip_map, &ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	if (value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		*value += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		/* E2BIG not tested for this example only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		bpf_map_update_elem(&ip_map, &ip, &init_val, BPF_NOEXIST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) char _license[] SEC("license") = "GPL";