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// SPDX-License-Identifier: GPL-2.0-only
#include <time.h>
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
struct timer {
struct bpf_timer t;
};
struct lock {
struct bpf_spin_lock l;
};
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, __u32);
__type(value, struct timer);
} timers SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, __u32);
__type(value, struct lock);
} locks SEC(".maps");
static int timer_cb(void *map, int *key, struct timer *timer)
{
return 0;
}
static void timer_work(void)
{
struct timer *timer;
const int key = 0;
timer = bpf_map_lookup_elem(&timers, &key);
if (timer) {
bpf_timer_init(&timer->t, &timers, CLOCK_MONOTONIC);
bpf_timer_set_callback(&timer->t, timer_cb);
bpf_timer_start(&timer->t, 10E9, 0);
bpf_timer_cancel(&timer->t);
}
}
static void spin_lock_work(void)
{
const int key = 0;
struct lock *lock;
lock = bpf_map_lookup_elem(&locks, &key);
if (lock) {
bpf_spin_lock(&lock->l);
bpf_spin_unlock(&lock->l);
}
}
SEC("raw_tp/sys_enter")
int raw_tp_timer(void *ctx)
{
timer_work();
return 0;
}
SEC("tp/syscalls/sys_enter_nanosleep")
int tp_timer(void *ctx)
{
timer_work();
return 0;
}
SEC("kprobe/sys_nanosleep")
int kprobe_timer(void *ctx)
{
timer_work();
return 0;
}
SEC("perf_event")
int perf_event_timer(void *ctx)
{
timer_work();
return 0;
}
SEC("raw_tp/sys_enter")
int raw_tp_spin_lock(void *ctx)
{
spin_lock_work();
return 0;
}
SEC("tp/syscalls/sys_enter_nanosleep")
int tp_spin_lock(void *ctx)
{
spin_lock_work();
return 0;
}
SEC("kprobe/sys_nanosleep")
int kprobe_spin_lock(void *ctx)
{
spin_lock_work();
return 0;
}
SEC("perf_event")
int perf_event_spin_lock(void *ctx)
{
spin_lock_work();
return 0;
}
const char LICENSE[] SEC("license") = "GPL";
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