[RFC,bpf-next,3/8] sched_ext: Add filter for scx_kfunc_ids_enqueue_dispatch

Commit Message

Juntong Deng Feb. 5, 2025, 7:30 p.m. UTC

This patch adds filter for scx_kfunc_ids_enqueue_dispatch.

The kfuncs in the scx_kfunc_ids_enqueue_dispatch set can be used in
enqueue, select_cpu, dispatch and other rq-locked operations.

Signed-off-by: Juntong Deng <[e-mail]>
---
 kernel/sched/ext.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

Patch

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index c92949aa23f6..d782ee618d54 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -6605,9 +6605,27 @@  BTF_ID_FLAGS(func, scx_bpf_dispatch, KF_RCU)
 BTF_ID_FLAGS(func, scx_bpf_dispatch_vtime, KF_RCU)
 BTF_KFUNCS_END(scx_kfunc_ids_enqueue_dispatch)
 
+static int scx_kfunc_ids_enqueue_dispatch_filter(const struct bpf_prog *prog, u32 kfunc_id)
+{
+	u32 moff;
+
+	if (!btf_id_set8_contains(&scx_kfunc_ids_enqueue_dispatch, kfunc_id) ||
+	    prog->aux->st_ops != &bpf_sched_ext_ops)
+		return 0;
+
+	moff = prog->aux->attach_st_ops_member_off;
+	if (moff == offsetof(struct sched_ext_ops, enqueue) ||
+	    moff == offsetof(struct sched_ext_ops, select_cpu) ||
+	    moff == offsetof(struct sched_ext_ops, dispatch))
+		return 0;
+
+	return scx_kfunc_ids_other_rqlocked_filter(prog, kfunc_id);
+}
+
 static const struct btf_kfunc_id_set scx_kfunc_set_enqueue_dispatch = {
 	.owner			= THIS_MODULE,
 	.set			= &scx_kfunc_ids_enqueue_dispatch,
+	.filter			= scx_kfunc_ids_enqueue_dispatch_filter,
 };
 
 static bool scx_dsq_move(struct bpf_iter_scx_dsq_kern *kit,