62 lines · c
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 */6 7#include <scx/common.bpf.h>8 9char _license[] SEC("license") = "GPL";10 11#include "hotplug_test.h"12 13UEI_DEFINE(uei);14 15void BPF_STRUCT_OPS(hotplug_exit, struct scx_exit_info *ei)16{17 UEI_RECORD(uei, ei);18}19 20static void exit_from_hotplug(s32 cpu, bool onlining)21{22 /*23 * Ignored, just used to verify that we can invoke blocking kfuncs24 * from the hotplug path.25 */26 scx_bpf_create_dsq(0, -1);27 28 s64 code = SCX_ECODE_ACT_RESTART | HOTPLUG_EXIT_RSN;29 30 if (onlining)31 code |= HOTPLUG_ONLINING;32 33 scx_bpf_exit(code, "hotplug event detected (%d going %s)", cpu,34 onlining ? "online" : "offline");35}36 37void BPF_STRUCT_OPS_SLEEPABLE(hotplug_cpu_online, s32 cpu)38{39 exit_from_hotplug(cpu, true);40}41 42void BPF_STRUCT_OPS_SLEEPABLE(hotplug_cpu_offline, s32 cpu)43{44 exit_from_hotplug(cpu, false);45}46 47SEC(".struct_ops.link")48struct sched_ext_ops hotplug_cb_ops = {49 .cpu_online = (void *) hotplug_cpu_online,50 .cpu_offline = (void *) hotplug_cpu_offline,51 .exit = (void *) hotplug_exit,52 .name = "hotplug_cbs",53 .timeout_ms = 1000U,54};55 56SEC(".struct_ops.link")57struct sched_ext_ops hotplug_nocb_ops = {58 .exit = (void *) hotplug_exit,59 .name = "hotplug_nocbs",60 .timeout_ms = 1000U,61};62