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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
#include <vmlinux.h>
#include <string.h>
#include <stdbool.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
#include "errno.h"
char _license[] SEC("license") = "GPL";
const void *user_ptr = NULL;
struct elem {
char data[128];
struct bpf_task_work tw;
};
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(map_flags, BPF_F_NO_PREALLOC);
__uint(max_entries, 1);
__type(key, int);
__type(value, struct elem);
} hmap SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, int);
__type(value, struct elem);
} arrmap SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_LRU_HASH);
__uint(max_entries, 1);
__type(key, int);
__type(value, struct elem);
} lrumap SEC(".maps");
static int process_work(struct bpf_map *map, void *key, void *value)
{
struct elem *work = value;
bpf_copy_from_user_str(work->data, sizeof(work->data), (const void *)user_ptr, 0);
return 0;
}
int key = 0;
SEC("perf_event")
int oncpu_hash_map(struct pt_regs *args)
{
struct elem empty_work = { .data = { 0 } };
struct elem *work;
struct task_struct *task;
int err;
task = bpf_get_current_task_btf();
err = bpf_map_update_elem(&hmap, &key, &empty_work, BPF_NOEXIST);
if (err)
return 0;
work = bpf_map_lookup_elem(&hmap, &key);
if (!work)
return 0;
bpf_task_work_schedule_resume(task, &work->tw, &hmap, process_work, NULL);
return 0;
}
SEC("perf_event")
int oncpu_array_map(struct pt_regs *args)
{
struct elem *work;
struct task_struct *task;
task = bpf_get_current_task_btf();
work = bpf_map_lookup_elem(&arrmap, &key);
if (!work)
return 0;
bpf_task_work_schedule_signal(task, &work->tw, &arrmap, process_work, NULL);
return 0;
}
SEC("perf_event")
int oncpu_lru_map(struct pt_regs *args)
{
struct elem empty_work = { .data = { 0 } };
struct elem *work;
struct task_struct *task;
int err;
task = bpf_get_current_task_btf();
work = bpf_map_lookup_elem(&lrumap, &key);
if (work)
return 0;
err = bpf_map_update_elem(&lrumap, &key, &empty_work, BPF_NOEXIST);
if (err)
return 0;
work = bpf_map_lookup_elem(&lrumap, &key);
if (!work || work->data[0])
return 0;
bpf_task_work_schedule_resume(task, &work->tw, &lrumap, process_work, NULL);
return 0;
}
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