56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (c) 2020 Google */
|
|
|
|
#include "vmlinux.h"
|
|
|
|
#include <bpf/bpf_helpers.h>
|
|
|
|
__u64 out__runqueues_addr = -1;
|
|
__u64 out__bpf_prog_active_addr = -1;
|
|
|
|
__u32 out__rq_cpu = -1; /* percpu struct fields */
|
|
int out__bpf_prog_active = -1; /* percpu int */
|
|
|
|
__u32 out__this_rq_cpu = -1;
|
|
int out__this_bpf_prog_active = -1;
|
|
|
|
__u32 out__cpu_0_rq_cpu = -1; /* cpu_rq(0)->cpu */
|
|
|
|
extern const struct rq runqueues __ksym; /* struct type global var. */
|
|
extern const int bpf_prog_active __ksym; /* int type global var. */
|
|
|
|
SEC("raw_tp/sys_enter")
|
|
int handler(const void *ctx)
|
|
{
|
|
struct rq *rq;
|
|
int *active;
|
|
__u32 cpu;
|
|
|
|
out__runqueues_addr = (__u64)&runqueues;
|
|
out__bpf_prog_active_addr = (__u64)&bpf_prog_active;
|
|
|
|
cpu = bpf_get_smp_processor_id();
|
|
|
|
/* test bpf_per_cpu_ptr() */
|
|
rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, cpu);
|
|
if (rq)
|
|
out__rq_cpu = rq->cpu;
|
|
active = (int *)bpf_per_cpu_ptr(&bpf_prog_active, cpu);
|
|
if (active)
|
|
out__bpf_prog_active = *active;
|
|
|
|
rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, 0);
|
|
if (rq) /* should always be valid, but we can't spare the check. */
|
|
out__cpu_0_rq_cpu = rq->cpu;
|
|
|
|
/* test bpf_this_cpu_ptr */
|
|
rq = (struct rq *)bpf_this_cpu_ptr(&runqueues);
|
|
out__this_rq_cpu = rq->cpu;
|
|
active = (int *)bpf_this_cpu_ptr(&bpf_prog_active);
|
|
out__this_bpf_prog_active = *active;
|
|
|
|
return 0;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|