1*4882a593Smuzhiyun /* Copyright (c) 2016, Facebook 2*4882a593Smuzhiyun * 3*4882a593Smuzhiyun * This program is free software; you can redistribute it and/or 4*4882a593Smuzhiyun * modify it under the terms of version 2 of the GNU General Public 5*4882a593Smuzhiyun * License as published by the Free Software Foundation. 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun #include <linux/skbuff.h> 8*4882a593Smuzhiyun #include <linux/netdevice.h> 9*4882a593Smuzhiyun #include <linux/version.h> 10*4882a593Smuzhiyun #include <uapi/linux/bpf.h> 11*4882a593Smuzhiyun #include <uapi/linux/perf_event.h> 12*4882a593Smuzhiyun #include <bpf/bpf_helpers.h> 13*4882a593Smuzhiyun #include <bpf/bpf_tracing.h> 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun struct { 16*4882a593Smuzhiyun __uint(type, BPF_MAP_TYPE_HASH); 17*4882a593Smuzhiyun __type(key, long); 18*4882a593Smuzhiyun __type(value, long); 19*4882a593Smuzhiyun __uint(max_entries, 1024); 20*4882a593Smuzhiyun } my_map SEC(".maps"); 21*4882a593Smuzhiyun struct { 22*4882a593Smuzhiyun __uint(type, BPF_MAP_TYPE_PERCPU_HASH); 23*4882a593Smuzhiyun __uint(key_size, sizeof(long)); 24*4882a593Smuzhiyun __uint(value_size, sizeof(long)); 25*4882a593Smuzhiyun __uint(max_entries, 1024); 26*4882a593Smuzhiyun } my_map2 SEC(".maps"); 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun struct { 29*4882a593Smuzhiyun __uint(type, BPF_MAP_TYPE_STACK_TRACE); 30*4882a593Smuzhiyun __uint(key_size, sizeof(u32)); 31*4882a593Smuzhiyun __uint(value_size, PERF_MAX_STACK_DEPTH * sizeof(u64)); 32*4882a593Smuzhiyun __uint(max_entries, 10000); 33*4882a593Smuzhiyun } stackmap SEC(".maps"); 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun #define PROG(foo) \ 36*4882a593Smuzhiyun int foo(struct pt_regs *ctx) \ 37*4882a593Smuzhiyun { \ 38*4882a593Smuzhiyun long v = PT_REGS_IP(ctx), *val; \ 39*4882a593Smuzhiyun \ 40*4882a593Smuzhiyun val = bpf_map_lookup_elem(&my_map, &v); \ 41*4882a593Smuzhiyun bpf_map_update_elem(&my_map, &v, &v, BPF_ANY); \ 42*4882a593Smuzhiyun bpf_map_update_elem(&my_map2, &v, &v, BPF_ANY); \ 43*4882a593Smuzhiyun bpf_map_delete_elem(&my_map2, &v); \ 44*4882a593Smuzhiyun bpf_get_stackid(ctx, &stackmap, BPF_F_REUSE_STACKID); \ 45*4882a593Smuzhiyun return 0; \ 46*4882a593Smuzhiyun } 47*4882a593Smuzhiyun 48*4882a593Smuzhiyun /* add kprobes to all possible *spin* functions */ 49*4882a593Smuzhiyun SEC("kprobe/spin_unlock")PROG(p1) 50*4882a593Smuzhiyun SEC("kprobe/spin_lock")PROG(p2) 51*4882a593Smuzhiyun SEC("kprobe/mutex_spin_on_owner")PROG(p3) 52*4882a593Smuzhiyun SEC("kprobe/rwsem_spin_on_owner")PROG(p4) 53*4882a593Smuzhiyun SEC("kprobe/spin_unlock_irqrestore")PROG(p5) 54*4882a593Smuzhiyun SEC("kprobe/_raw_spin_unlock_irqrestore")PROG(p6) 55*4882a593Smuzhiyun SEC("kprobe/_raw_spin_unlock_bh")PROG(p7) 56*4882a593Smuzhiyun SEC("kprobe/_raw_spin_unlock")PROG(p8) 57*4882a593Smuzhiyun SEC("kprobe/_raw_spin_lock_irqsave")PROG(p9) 58*4882a593Smuzhiyun SEC("kprobe/_raw_spin_trylock_bh")PROG(p10) 59*4882a593Smuzhiyun SEC("kprobe/_raw_spin_lock_irq")PROG(p11) 60*4882a593Smuzhiyun SEC("kprobe/_raw_spin_trylock")PROG(p12) 61*4882a593Smuzhiyun SEC("kprobe/_raw_spin_lock")PROG(p13) 62*4882a593Smuzhiyun SEC("kprobe/_raw_spin_lock_bh")PROG(p14) 63*4882a593Smuzhiyun /* and to inner bpf helpers */ 64*4882a593Smuzhiyun SEC("kprobe/htab_map_update_elem")PROG(p15) 65*4882a593Smuzhiyun SEC("kprobe/__htab_percpu_map_update_elem")PROG(p16) 66*4882a593Smuzhiyun SEC("kprobe/htab_map_alloc")PROG(p17) 67*4882a593Smuzhiyun 68*4882a593Smuzhiyun char _license[] SEC("license") = "GPL"; 69*4882a593Smuzhiyun u32 _version SEC("version") = LINUX_VERSION_CODE; 70