1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2022 Google */
3 #include "vmlinux.h"
4 #include <bpf/bpf_helpers.h>
5 #include <bpf/bpf_tracing.h>
6
7 struct bpf_testmod_btf_type_tag_1 {
8 int a;
9 };
10
11 struct bpf_testmod_btf_type_tag_2 {
12 struct bpf_testmod_btf_type_tag_1 *p;
13 };
14
15 __u64 g;
16
17 SEC("fentry/bpf_testmod_test_btf_type_tag_percpu_1")
BPF_PROG(test_percpu1,struct bpf_testmod_btf_type_tag_1 * arg)18 int BPF_PROG(test_percpu1, struct bpf_testmod_btf_type_tag_1 *arg)
19 {
20 g = arg->a;
21 return 0;
22 }
23
24 SEC("fentry/bpf_testmod_test_btf_type_tag_percpu_2")
BPF_PROG(test_percpu2,struct bpf_testmod_btf_type_tag_2 * arg)25 int BPF_PROG(test_percpu2, struct bpf_testmod_btf_type_tag_2 *arg)
26 {
27 g = arg->p->a;
28 return 0;
29 }
30
31 /* trace_cgroup_mkdir(struct cgroup *cgrp, const char *path)
32 *
33 * struct css_rstat_cpu {
34 * ...
35 * struct cgroup_subsys_state *updated_children;
36 * ...
37 * };
38 *
39 * struct cgroup_subsys_state {
40 * ...
41 * struct css_rstat_cpu __percpu *rstat_cpu;
42 * ...
43 * };
44 *
45 * struct cgroup {
46 * struct cgroup_subsys_state self;
47 * ...
48 * };
49 */
50 SEC("tp_btf/cgroup_mkdir")
BPF_PROG(test_percpu_load,struct cgroup * cgrp,const char * path)51 int BPF_PROG(test_percpu_load, struct cgroup *cgrp, const char *path)
52 {
53 g = (__u64)cgrp->self.rstat_cpu->updated_children;
54 return 0;
55 }
56
57 SEC("tp_btf/cgroup_mkdir")
BPF_PROG(test_percpu_helper,struct cgroup * cgrp,const char * path)58 int BPF_PROG(test_percpu_helper, struct cgroup *cgrp, const char *path)
59 {
60 struct css_rstat_cpu *rstat;
61 __u32 cpu;
62
63 cpu = bpf_get_smp_processor_id();
64 rstat = (struct css_rstat_cpu *)bpf_per_cpu_ptr(
65 cgrp->self.rstat_cpu, cpu);
66 if (rstat) {
67 /* READ_ONCE */
68 *(volatile long *)rstat;
69 }
70
71 return 0;
72 }
73 char _license[] SEC("license") = "GPL";
74