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// SPDX-License-Identifier: GPL-2.0
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bpf_experimental.h"
char _license[] SEC("license") = "GPL";
#define CLOCK_MONOTONIC 1
int preempt_count;
int in_interrupt;
int in_interrupt_cb;
struct elem {
struct bpf_timer t;
};
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, int);
__type(value, struct elem);
} array SEC(".maps");
static int timer_in_interrupt(void *map, int *key, struct bpf_timer *timer)
{
preempt_count = get_preempt_count();
in_interrupt_cb = bpf_in_interrupt();
return 0;
}
SEC("fentry/bpf_fentry_test1")
int BPF_PROG(test_timer_interrupt)
{
struct bpf_timer *timer;
int key = 0;
timer = bpf_map_lookup_elem(&array, &key);
if (!timer)
return 0;
in_interrupt = bpf_in_interrupt();
bpf_timer_init(timer, &array, CLOCK_MONOTONIC);
bpf_timer_set_callback(timer, timer_in_interrupt);
bpf_timer_start(timer, 0, 0);
return 0;
}
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