1/* Copyright (c) 2016, Facebook
 2 *
 3 * This program is free software; you can redistribute it and/or
 4 * modify it under the terms of version 2 of the GNU General Public
 5 * License as published by the Free Software Foundation.
 6 */
 7#include <linux/skbuff.h>
 8#include <linux/netdevice.h>
 9#include <linux/version.h>
10#include <uapi/linux/bpf.h>
11#include <uapi/linux/perf_event.h>
12#include "bpf_helpers.h"
13
14struct bpf_map_def SEC("maps") my_map = {
15	.type = BPF_MAP_TYPE_HASH,
16	.key_size = sizeof(long),
17	.value_size = sizeof(long),
18	.max_entries = 1024,
19};
20struct bpf_map_def SEC("maps") my_map2 = {
21	.type = BPF_MAP_TYPE_PERCPU_HASH,
22	.key_size = sizeof(long),
23	.value_size = sizeof(long),
24	.max_entries = 1024,
25};
26
27struct bpf_map_def SEC("maps") stackmap = {
28	.type = BPF_MAP_TYPE_STACK_TRACE,
29	.key_size = sizeof(u32),
30	.value_size = PERF_MAX_STACK_DEPTH * sizeof(u64),
31	.max_entries = 10000,
32};
33
34#define PROG(foo) \
35int foo(struct pt_regs *ctx) \
36{ \
37	long v = PT_REGS_IP(ctx), *val; \
38\
39	val = bpf_map_lookup_elem(&my_map, &v); \
40	bpf_map_update_elem(&my_map, &v, &v, BPF_ANY); \
41	bpf_map_update_elem(&my_map2, &v, &v, BPF_ANY); \
42	bpf_map_delete_elem(&my_map2, &v); \
43	bpf_get_stackid(ctx, &stackmap, BPF_F_REUSE_STACKID); \
44	return 0; \
45}
46
47/* add kprobes to all possible *spin* functions */
48SEC("kprobe/spin_unlock")PROG(p1)
49SEC("kprobe/spin_lock")PROG(p2)
50SEC("kprobe/mutex_spin_on_owner")PROG(p3)
51SEC("kprobe/rwsem_spin_on_owner")PROG(p4)
52SEC("kprobe/spin_unlock_irqrestore")PROG(p5)
53SEC("kprobe/_raw_spin_unlock_irqrestore")PROG(p6)
54SEC("kprobe/_raw_spin_unlock_bh")PROG(p7)
55SEC("kprobe/_raw_spin_unlock")PROG(p8)
56SEC("kprobe/_raw_spin_lock_irqsave")PROG(p9)
57SEC("kprobe/_raw_spin_trylock_bh")PROG(p10)
58SEC("kprobe/_raw_spin_lock_irq")PROG(p11)
59SEC("kprobe/_raw_spin_trylock")PROG(p12)
60SEC("kprobe/_raw_spin_lock")PROG(p13)
61SEC("kprobe/_raw_spin_lock_bh")PROG(p14)
62/* and to inner bpf helpers */
63SEC("kprobe/htab_map_update_elem")PROG(p15)
64SEC("kprobe/__htab_percpu_map_update_elem")PROG(p16)
65SEC("kprobe/htab_map_alloc")PROG(p17)
66
67char _license[] SEC("license") = "GPL";
68u32 _version SEC("version") = LINUX_VERSION_CODE;