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Message-ID: <20241005122531.20298-5-fujita.tomonori@gmail.com>
Date: Sat, 5 Oct 2024 21:25:29 +0900
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: netdev@...r.kernel.org
Cc: rust-for-linux@...r.kernel.org,
andrew@...n.ch,
hkallweit1@...il.com,
tmgross@...ch.edu,
ojeda@...nel.org,
alex.gaynor@...il.com,
gary@...yguo.net,
bjorn3_gh@...tonmail.com,
benno.lossin@...ton.me,
a.hindborg@...sung.com,
aliceryhl@...gle.com,
anna-maria@...utronix.de,
frederic@...nel.org,
tglx@...utronix.de,
arnd@...db.de,
linux-kernel@...r.kernel.org
Subject: [PATCH net-next v2 4/6] rust: time: add wrapper for fsleep function
Add a wrapper for fsleep, flexible sleep functions in
`include/linux/delay.h` which deals with hardware delays.
The kernel supports several `sleep` functions to handle various
lengths of delay. This adds fsleep, automatically chooses the best
sleep method based on a duration.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@...il.com>
---
rust/helpers/time.c | 6 ++++++
rust/kernel/time.rs | 16 ++++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/rust/helpers/time.c b/rust/helpers/time.c
index 60dee69f4efc..0c85bb06af63 100644
--- a/rust/helpers/time.c
+++ b/rust/helpers/time.c
@@ -1,7 +1,13 @@
// SPDX-License-Identifier: GPL-2.0
+#include <linux/delay.h>
#include <linux/ktime.h>
+void rust_helper_fsleep(unsigned long usecs)
+{
+ fsleep(usecs);
+}
+
ktime_t rust_helper_ktime_add_ns(const ktime_t kt, const u64 nsec)
{
return ktime_add_ns(kt, nsec);
diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
index 3e00ad22ed89..5cca9c60f74a 100644
--- a/rust/kernel/time.rs
+++ b/rust/kernel/time.rs
@@ -5,9 +5,12 @@
//! This module contains the kernel APIs related to time and timers that
//! have been ported or wrapped for usage by Rust code in the kernel.
//!
+//! C header: [`include/linux/delay.h`](srctree/include/linux/delay.h).
//! C header: [`include/linux/jiffies.h`](srctree/include/linux/jiffies.h).
//! C header: [`include/linux/ktime.h`](srctree/include/linux/ktime.h).
+use core::ffi::c_ulong;
+
/// The number of nanoseconds per microsecond.
pub const NSEC_PER_USEC: i64 = bindings::NSEC_PER_USEC as i64;
@@ -178,3 +181,16 @@ fn add(self, delta: Delta) -> Ktime {
Ktime::from_raw(t)
}
}
+
+/// Sleeps for a given duration.
+///
+/// Equivalent to the kernel's [`fsleep`], flexible sleep function,
+/// which automatically chooses the best sleep method based on a duration.
+///
+/// `Delta` must be longer than one microsecond.
+///
+/// This function can only be used in a nonatomic context.
+pub fn fsleep(delta: Delta) {
+ // SAFETY: FFI call.
+ unsafe { bindings::fsleep(delta.as_micros() as c_ulong) }
+}
--
2.34.1
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