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 "vmlinux.h"
8 #include <linux/version.h>
9 #include <bpf/bpf_helpers.h>
10 #include <bpf/bpf_tracing.h>
11
12 #ifndef PERF_MAX_STACK_DEPTH
13 #define PERF_MAX_STACK_DEPTH 127
14 #endif
15
16 struct {
17 __uint(type, BPF_MAP_TYPE_HASH);
18 __type(key, long);
19 __type(value, long);
20 __uint(max_entries, 1024);
21 } my_map SEC(".maps");
22 struct {
23 __uint(type, BPF_MAP_TYPE_PERCPU_HASH);
24 __uint(key_size, sizeof(long));
25 __uint(value_size, sizeof(long));
26 __uint(max_entries, 1024);
27 } my_map2 SEC(".maps");
28
29 struct {
30 __uint(type, BPF_MAP_TYPE_STACK_TRACE);
31 __uint(key_size, sizeof(u32));
32 __uint(value_size, PERF_MAX_STACK_DEPTH * sizeof(u64));
33 __uint(max_entries, 10000);
34 } stackmap SEC(".maps");
35
36 #define PROG(foo) \
37 int foo(struct pt_regs *ctx) \
38 { \
39 long v = PT_REGS_IP(ctx), *val; \
40 \
41 val = bpf_map_lookup_elem(&my_map, &v); \
42 bpf_map_update_elem(&my_map, &v, &v, BPF_ANY); \
43 bpf_map_update_elem(&my_map2, &v, &v, BPF_ANY); \
44 bpf_map_delete_elem(&my_map2, &v); \
45 bpf_get_stackid(ctx, &stackmap, BPF_F_REUSE_STACKID); \
46 return 0; \
47 }
48
49 /* add kprobes to all possible *spin* functions */
50 SEC("kprobe.multi/spin_*lock*")PROG(spin_lock)
51 SEC("kprobe.multi/*_spin_on_owner")PROG(spin_on_owner)
52 SEC("kprobe.multi/_raw_spin_*lock*")PROG(raw_spin_lock)
53
54 /* and to inner bpf helpers */
55 SEC("kprobe/htab_map_update_elem")PROG(p15)
56 SEC("kprobe/__htab_percpu_map_update_elem")PROG(p16)
57 SEC("kprobe/htab_map_alloc")PROG(p17)
58
59 char _license[] SEC("license") = "GPL";
60 u32 _version SEC("version") = LINUX_VERSION_CODE;
61
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.