[PATCH] rust: workqueue: define built-in bh queues

From: Hamza Mahfooz
Date: Fri Feb 21 2025 - 17:36:24 EST


We provide these methods because it lets us access these queues from
Rust without using unsafe code.

Signed-off-by: Hamza Mahfooz <hamzamahfooz@xxxxxxxxxxxxxxxxxxx>
---
rust/kernel/workqueue.rs | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
index 0cd100d2aefb..68ce70d94f2d 100644
--- a/rust/kernel/workqueue.rs
+++ b/rust/kernel/workqueue.rs
@@ -703,3 +703,21 @@ pub fn system_freezable_power_efficient() -> &'static Queue {
// SAFETY: `system_freezable_power_efficient_wq` is a C global, always available.
unsafe { Queue::from_raw(bindings::system_freezable_power_efficient_wq) }
}
+
+/// Returns the system bottom halves work queue (`system_bh_wq`).
+///
+/// It is similar to the one returned by [`system`] but for work items which
+/// need to run from a softirq context.
+pub fn system_bh() -> &'static Queue {
+ // SAFETY: `system_bh_wq` is a C global, always available.
+ unsafe { Queue::from_raw(bindings::system_bh_wq) }
+}
+
+/// Returns the system bottom halves high-priority work queue (`system_bh_highpri_wq`).
+///
+/// It is similar to the one returned by [`system_bh`] but for work items which
+/// require higher scheduling priority.
+pub fn system_bh_highpri() -> &'static Queue {
+ // SAFETY: `system_bh_highpri_wq` is a C global, always available.
+ unsafe { Queue::from_raw(bindings::system_bh_highpri_wq) }
+}
--
2.47.1