// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Google */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

struct bpf_testmod_btf_type_tag_1 {
        int a;
};

struct bpf_testmod_btf_type_tag_2 {
        struct bpf_testmod_btf_type_tag_1 *p;
};

__u64 g;

SEC("fentry/bpf_testmod_test_btf_type_tag_percpu_1")
int BPF_PROG(test_percpu1, struct bpf_testmod_btf_type_tag_1 *arg)
{
        g = arg->a;
        return 0;
}

SEC("fentry/bpf_testmod_test_btf_type_tag_percpu_2")
int BPF_PROG(test_percpu2, struct bpf_testmod_btf_type_tag_2 *arg)
{
        g = arg->p->a;
        return 0;
}

/* trace_cgroup_mkdir(struct cgroup *cgrp, const char *path)
 *
 * struct css_rstat_cpu {
 *   ...
 *   struct cgroup_subsys_state *updated_children;
 *   ...
 * };
 *
 * struct cgroup_subsys_state {
 *   ...
 *   struct css_rstat_cpu __percpu *rstat_cpu;
 *   ...
 * };
 *
 * struct cgroup {
 *   struct cgroup_subsys_state self;
 *   ...
 * };
 */
SEC("tp_btf/cgroup_mkdir")
int BPF_PROG(test_percpu_load, struct cgroup *cgrp, const char *path)
{
        g = (__u64)cgrp->self.rstat_cpu->updated_children;
        return 0;
}

SEC("tp_btf/cgroup_mkdir")
int BPF_PROG(test_percpu_helper, struct cgroup *cgrp, const char *path)
{
        struct css_rstat_cpu *rstat;
        __u32 cpu;

        cpu = bpf_get_smp_processor_id();
        rstat = (struct css_rstat_cpu *)bpf_per_cpu_ptr(
                        cgrp->self.rstat_cpu, cpu);
        if (rstat) {
                /* READ_ONCE */
                *(volatile long *)rstat;
        }

        return 0;
}
char _license[] SEC("license") = "GPL";