tools/testing/selftests/sched_ext/ddsp_vtimelocal_fail.bpf.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  * Copyright (c) 2024 Tejun Heo <tj@kernel.org>
   6  */
   7 #include <scx/common.bpf.h>
   8
   9 char _license[] SEC("license") = "GPL";
  10
  11 UEI_DEFINE(uei);
  12
  13 s32 BPF_STRUCT_OPS(ddsp_vtimelocal_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                 /* Shouldn't be allowed to vtime dispatch to a builtin DSQ. */
  20                 scx_bpf_dispatch_vtime(p, SCX_DSQ_LOCAL, SCX_SLICE_DFL,
  21                                        p->scx.dsq_vtime, 0);
  22                 return cpu;
  23         }
  24
  25         return prev_cpu;
  26 }
  27
  28 void BPF_STRUCT_OPS(ddsp_vtimelocal_fail_exit, struct scx_exit_info *ei)
  29 {
  30         UEI_RECORD(uei, ei);
  31 }
  32
  33 SEC(".struct_ops.link")
  34 struct sched_ext_ops ddsp_vtimelocal_fail_ops = {
  35         .select_cpu             = (void *) ddsp_vtimelocal_fail_select_cpu,
  36         .exit                   = (void *) ddsp_vtimelocal_fail_exit,
  37         .name                   = "ddsp_vtimelocal_fail",
  38         .timeout_ms             = 1000U,
  39 };