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9d8b612d AS |
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> | |
7dcc42b6 | 11 | #include <uapi/linux/perf_event.h> |
9d8b612d AS |
12 | #include "bpf_helpers.h" |
13 | ||
14 | struct 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 | }; | |
20 | struct 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 | ||
7dcc42b6 AS |
27 | struct 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 | ||
9d8b612d AS |
34 | #define PROG(foo) \ |
35 | int foo(struct pt_regs *ctx) \ | |
36 | { \ | |
37 | long v = ctx->ip, *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); \ | |
7dcc42b6 | 43 | bpf_get_stackid(ctx, &stackmap, BPF_F_REUSE_STACKID); \ |
9d8b612d AS |
44 | return 0; \ |
45 | } | |
46 | ||
47 | /* add kprobes to all possible *spin* functions */ | |
48 | SEC("kprobe/spin_unlock")PROG(p1) | |
49 | SEC("kprobe/spin_lock")PROG(p2) | |
50 | SEC("kprobe/mutex_spin_on_owner")PROG(p3) | |
51 | SEC("kprobe/rwsem_spin_on_owner")PROG(p4) | |
52 | SEC("kprobe/spin_unlock_irqrestore")PROG(p5) | |
53 | SEC("kprobe/_raw_spin_unlock_irqrestore")PROG(p6) | |
54 | SEC("kprobe/_raw_spin_unlock_bh")PROG(p7) | |
55 | SEC("kprobe/_raw_spin_unlock")PROG(p8) | |
56 | SEC("kprobe/_raw_spin_lock_irqsave")PROG(p9) | |
57 | SEC("kprobe/_raw_spin_trylock_bh")PROG(p10) | |
58 | SEC("kprobe/_raw_spin_lock_irq")PROG(p11) | |
59 | SEC("kprobe/_raw_spin_trylock")PROG(p12) | |
60 | SEC("kprobe/_raw_spin_lock")PROG(p13) | |
61 | SEC("kprobe/_raw_spin_lock_bh")PROG(p14) | |
62 | /* and to inner bpf helpers */ | |
63 | SEC("kprobe/htab_map_update_elem")PROG(p15) | |
64 | SEC("kprobe/__htab_percpu_map_update_elem")PROG(p16) | |
65 | SEC("kprobe/htab_map_alloc")PROG(p17) | |
66 | ||
67 | char _license[] SEC("license") = "GPL"; | |
68 | u32 _version SEC("version") = LINUX_VERSION_CODE; |