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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Copyright (c) 2023 Meta Platforms, Inc. and affiliates.4 * Copyright (c) 2023 David Vernet <dvernet@meta.com>5 * Copyright (c) 2023 Tejun Heo <tj@kernel.org>6 */7 8#include <scx/common.bpf.h>9 10char _license[] SEC("license") = "GPL";11 12/* Manually specify the signature until the kfunc is added to the scx repo. */13s32 scx_bpf_select_cpu_dfl(struct task_struct *p, s32 prev_cpu, u64 wake_flags,14 bool *found) __ksym;15 16s32 BPF_STRUCT_OPS(enq_select_cpu_fails_select_cpu, struct task_struct *p,17 s32 prev_cpu, u64 wake_flags)18{19 return prev_cpu;20}21 22void BPF_STRUCT_OPS(enq_select_cpu_fails_enqueue, struct task_struct *p,23 u64 enq_flags)24{25 /*26 * Need to initialize the variable or the verifier will fail to load.27 * Improving these semantics is actively being worked on.28 */29 bool found = false;30 31 /* Can only call from ops.select_cpu() */32 scx_bpf_select_cpu_dfl(p, 0, 0, &found);33 34 scx_bpf_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, enq_flags);35}36 37SEC(".struct_ops.link")38struct sched_ext_ops enq_select_cpu_fails_ops = {39 .select_cpu = (void *) enq_select_cpu_fails_select_cpu,40 .enqueue = (void *) enq_select_cpu_fails_enqueue,41 .name = "enq_select_cpu_fails",42 .timeout_ms = 1000U,43};44