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