projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | { \ | |
| 138d6153 | 37 | long v = PT_REGS_IP(ctx), *val; \ |
| 9d8b612d AS |
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; |