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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2024 Meta Platforms, Inc. and affiliates.
* Copyright (c) 2024 Tejun Heo <tj@kernel.org>
* Copyright (c) 2024 David Vernet <dvernet@meta.com>
*/
#ifndef __SCX_COMPAT_BPF_H
#define __SCX_COMPAT_BPF_H
#define __COMPAT_ENUM_OR_ZERO(__type, __ent) \
({ \
__type __ret = 0; \
if (bpf_core_enum_value_exists(__type, __ent)) \
__ret = __ent; \
__ret; \
})
/* v6.12: 819513666966 ("sched_ext: Add cgroup support") */
#define __COMPAT_scx_bpf_task_cgroup(p) \
(bpf_ksym_exists(scx_bpf_task_cgroup) ? \
scx_bpf_task_cgroup((p)) : NULL)
/* v6.12: 4c30f5ce4f7a ("sched_ext: Implement scx_bpf_dispatch[_vtime]_from_dsq()") */
#define __COMPAT_scx_bpf_dispatch_from_dsq_set_slice(it, slice) \
(bpf_ksym_exists(scx_bpf_dispatch_from_dsq_set_slice) ? \
scx_bpf_dispatch_from_dsq_set_slice((it), (slice)) : (void)0)
#define __COMPAT_scx_bpf_dispatch_from_dsq_set_vtime(it, vtime) \
(bpf_ksym_exists(scx_bpf_dispatch_from_dsq_set_vtime) ? \
scx_bpf_dispatch_from_dsq_set_vtime((it), (vtime)) : (void)0)
#define __COMPAT_scx_bpf_dispatch_from_dsq(it, p, dsq_id, enq_flags) \
(bpf_ksym_exists(scx_bpf_dispatch_from_dsq) ? \
scx_bpf_dispatch_from_dsq((it), (p), (dsq_id), (enq_flags)) : false)
#define __COMPAT_scx_bpf_dispatch_vtime_from_dsq(it, p, dsq_id, enq_flags) \
(bpf_ksym_exists(scx_bpf_dispatch_vtime_from_dsq) ? \
scx_bpf_dispatch_vtime_from_dsq((it), (p), (dsq_id), (enq_flags)) : false)
/*
* v6.13: The verb `dispatch` was too overloaded and confusing. kfuncs are
* renamed to unload the verb.
*
* Build error is triggered if old names are used. New binaries work with both
* new and old names. The compat macros will be removed on v6.15 release.
*/
void scx_bpf_dispatch___compat(struct task_struct *p, u64 dsq_id, u64 slice, u64 enq_flags) __ksym __weak;
void scx_bpf_dispatch_vtime___compat(struct task_struct *p, u64 dsq_id, u64 slice, u64 vtime, u64 enq_flags) __ksym __weak;
#define scx_bpf_dsq_insert(p, dsq_id, slice, enq_flags) \
(bpf_ksym_exists(scx_bpf_dsq_insert) ? \
scx_bpf_dsq_insert((p), (dsq_id), (slice), (enq_flags)) : \
scx_bpf_dispatch___compat((p), (dsq_id), (slice), (enq_flags)))
#define scx_bpf_dsq_insert_vtime(p, dsq_id, slice, vtime, enq_flags) \
(bpf_ksym_exists(scx_bpf_dsq_insert_vtime) ? \
scx_bpf_dsq_insert_vtime((p), (dsq_id), (slice), (vtime), (enq_flags)) : \
scx_bpf_dispatch_vtime___compat((p), (dsq_id), (slice), (vtime), (enq_flags)))
#define scx_bpf_dispatch(p, dsq_id, slice, enq_flags) \
_Static_assert(false, "scx_bpf_dispatch() renamed to scx_bpf_dsq_insert()")
#define scx_bpf_dispatch_vtime(p, dsq_id, slice, vtime, enq_flags) \
_Static_assert(false, "scx_bpf_dispatch_vtime() renamed to scx_bpf_dsq_insert_vtime()")
/*
* Define sched_ext_ops. This may be expanded to define multiple variants for
* backward compatibility. See compat.h::SCX_OPS_LOAD/ATTACH().
*/
#define SCX_OPS_DEFINE(__name, ...) \
SEC(".struct_ops.link") \
struct sched_ext_ops __name = { \
__VA_ARGS__, \
};
#endif /* __SCX_COMPAT_BPF_H */
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