1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (c) 2024 Meta Platforms, Inc. and affiliates.
4 * Copyright (c) 2024 Tejun Heo <tj@kernel.org>
5 * Copyright (c) 2024 David Vernet <dvernet@meta.com>
6 */
7 #ifndef __SCX_COMPAT_BPF_H
8 #define __SCX_COMPAT_BPF_H
9
10 #define __COMPAT_ENUM_OR_ZERO(__type, __ent) \
11 ({ \
12 __type __ret = 0; \
13 if (bpf_core_enum_value_exists(__type, __ent)) \
14 __ret = __ent; \
15 __ret; \
16 })
17
18 /* v6.12: 819513666966 ("sched_ext: Add cgroup support") */
19 #define __COMPAT_scx_bpf_task_cgroup(p) \
20 (bpf_ksym_exists(scx_bpf_task_cgroup) ? \
21 scx_bpf_task_cgroup((p)) : NULL)
22
23 /* v6.12: 4c30f5ce4f7a ("sched_ext: Implement scx_bpf_dispatch[_vtime]_from_dsq()") */
24 #define __COMPAT_scx_bpf_dispatch_from_dsq_set_slice(it, slice) \
25 (bpf_ksym_exists(scx_bpf_dispatch_from_dsq_set_slice) ? \
26 scx_bpf_dispatch_from_dsq_set_slice((it), (slice)) : (void)0)
27 #define __COMPAT_scx_bpf_dispatch_from_dsq_set_vtime(it, vtime) \
28 (bpf_ksym_exists(scx_bpf_dispatch_from_dsq_set_vtime) ? \
29 scx_bpf_dispatch_from_dsq_set_vtime((it), (vtime)) : (void)0)
30 #define __COMPAT_scx_bpf_dispatch_from_dsq(it, p, dsq_id, enq_flags) \
31 (bpf_ksym_exists(scx_bpf_dispatch_from_dsq) ? \
32 scx_bpf_dispatch_from_dsq((it), (p), (dsq_id), (enq_flags)) : false)
33 #define __COMPAT_scx_bpf_dispatch_vtime_from_dsq(it, p, dsq_id, enq_flags) \
34 (bpf_ksym_exists(scx_bpf_dispatch_vtime_from_dsq) ? \
35 scx_bpf_dispatch_vtime_from_dsq((it), (p), (dsq_id), (enq_flags)) : false)
36
37 /*
38 * Define sched_ext_ops. This may be expanded to define multiple variants for
39 * backward compatibility. See compat.h::SCX_OPS_LOAD/ATTACH().
40 */
41 #define SCX_OPS_DEFINE(__name, ...) \
42 SEC(".struct_ops.link") \
43 struct sched_ext_ops __name = { \
44 __VA_ARGS__, \
45 };
46
47 #endif /* __SCX_COMPAT_BPF_H */
48
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