linux-kernel - [PATCH v2] rust: workqueue: define built-in bh queues

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Message-ID: <20250224142326.38396-1-hamzamahfooz@linux.microsoft.com>
Date: Mon, 24 Feb 2025 09:23:23 -0500
From: Hamza Mahfooz <hamzamahfooz@...ux.microsoft.com>
To: rust-for-linux@...r.kernel.org
Cc: Tejun Heo <tj@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Hamza Mahfooz <hamzamahfooz@...ux.microsoft.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Wedson Almeida Filho <walmeida@...rosoft.com>,
	Dirk Behme <dirk.behme@...il.com>,
	Konstantin Andrikopoulos <kernel@...dragore.io>,
	Danilo Krummrich <dakr@...nel.org>,
	Roland Xu <mu001999@...look.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] rust: workqueue: define built-in bh queues

Provide safe getters to the system bh work queues. They will be used
to reimplement the Hyper-V VMBus in rust.

Signed-off-by: Hamza Mahfooz <hamzamahfooz@...ux.microsoft.com>
---
v2: make the commit message suck less.
---
 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