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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Copyright (c) 2024 Meta Platforms, Inc. and affiliates.4 * Copyright (c) 2024 David Vernet <dvernet@meta.com>5 * Copyright (c) 2024 Tejun Heo <tj@kernel.org>6 */7#include <scx/common.bpf.h>8 9char _license[] SEC("license") = "GPL";10 11UEI_DEFINE(uei);12 13s32 BPF_STRUCT_OPS(ddsp_bogus_dsq_fail_select_cpu, struct task_struct *p,14 s32 prev_cpu, u64 wake_flags)15{16 s32 cpu = scx_bpf_pick_idle_cpu(p->cpus_ptr, 0);17 18 if (cpu >= 0) {19 /*20 * If we dispatch to a bogus DSQ that will fall back to the21 * builtin global DSQ, we fail gracefully.22 */23 scx_bpf_dispatch_vtime(p, 0xcafef00d, SCX_SLICE_DFL,24 p->scx.dsq_vtime, 0);25 return cpu;26 }27 28 return prev_cpu;29}30 31void BPF_STRUCT_OPS(ddsp_bogus_dsq_fail_exit, struct scx_exit_info *ei)32{33 UEI_RECORD(uei, ei);34}35 36SEC(".struct_ops.link")37struct sched_ext_ops ddsp_bogus_dsq_fail_ops = {38 .select_cpu = (void *) ddsp_bogus_dsq_fail_select_cpu,39 .exit = (void *) ddsp_bogus_dsq_fail_exit,40 .name = "ddsp_bogus_dsq_fail",41 .timeout_ms = 1000U,42};43