Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * Copyright (c) 2015 BMW Car IT GmbH
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * This program is free software; you can redistribute it and/or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * modify it under the terms of version 2 of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * License as published by the Free Software Foundation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/version.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <uapi/linux/bpf.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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define MAX_ENTRIES	20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define MAX_CPU		4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /* We need to stick to static allocated memory (an array instead of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  * hash table) because managing dynamic memory from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  * trace_preempt_[on|off] tracepoints hooks is not supported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	__uint(type, BPF_MAP_TYPE_ARRAY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	__type(key, int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	__type(value, u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	__uint(max_entries, MAX_CPU);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) } my_map SEC(".maps");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) SEC("kprobe/trace_preempt_off")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) int bpf_prog1(struct pt_regs *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	int cpu = bpf_get_smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	u64 *ts = bpf_map_lookup_elem(&my_map, &cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	if (ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		*ts = bpf_ktime_get_ns();
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static unsigned int log2(unsigned int v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	unsigned int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	unsigned int shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	r = (v > 0xFFFF) << 4; v >>= r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	shift = (v > 0xFF) << 3; v >>= shift; r |= shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	shift = (v > 0xF) << 2; v >>= shift; r |= shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	shift = (v > 0x3) << 1; v >>= shift; r |= shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	r |= (v >> 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static unsigned int log2l(unsigned long v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	unsigned int hi = v >> 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	if (hi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		return log2(hi) + 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 		return log2(v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	__uint(type, BPF_MAP_TYPE_ARRAY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	__type(key, int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	__type(value, long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	__uint(max_entries, MAX_CPU * MAX_ENTRIES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) } my_lat SEC(".maps");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) SEC("kprobe/trace_preempt_on")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) int bpf_prog2(struct pt_regs *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	u64 *ts, cur_ts, delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	int key, cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	long *val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	cpu = bpf_get_smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	ts = bpf_map_lookup_elem(&my_map, &cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	if (!ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	cur_ts = bpf_ktime_get_ns();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 	delta = log2l(cur_ts - *ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 	if (delta > MAX_ENTRIES - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 		delta = MAX_ENTRIES - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) 	key = cpu * MAX_ENTRIES + delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) 	val = bpf_map_lookup_elem(&my_lat, &key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) 	if (val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) 		__sync_fetch_and_add((long *)val, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) char _license[] SEC("license") = "GPL";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) u32 _version SEC("version") = LINUX_VERSION_CODE;