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Message-Id: <20241017-hrtimer-v3-v6-12-rc2-v3-11-59a75cbb44da@kernel.org>
Date: Thu, 17 Oct 2024 15:04:38 +0200
From: Andreas Hindborg <a.hindborg@...nel.org>
To: Miguel Ojeda <ojeda@...nel.org>,
Anna-Maria Behnsen <anna-maria@...utronix.de>,
Frederic Weisbecker <frederic@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>
Cc: 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>, Alice Ryhl <aliceryhl@...gle.com>,
Trevor Gross <tmgross@...ch.edu>, Lyude Paul <lyude@...hat.com>,
rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
Andreas Hindborg <a.hindborg@...nel.org>
Subject: [PATCH v3 11/13] rust: hrtimer: add `TimerMode`
Allow selection of timer mode by passing a `TimerMode` variant to
`Timer::new`.
Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
---
rust/kernel/hrtimer.rs | 88 +++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 84 insertions(+), 4 deletions(-)
diff --git a/rust/kernel/hrtimer.rs b/rust/kernel/hrtimer.rs
index 2c1573e19576de93afc959d71e94173e2c1ed715..1674d1dcba39cc7ab82e1f189002afa365ee9341 100644
--- a/rust/kernel/hrtimer.rs
+++ b/rust/kernel/hrtimer.rs
@@ -38,12 +38,13 @@
/// # Invariants
///
/// * `self.timer` is initialized by `bindings::hrtimer_init`.
-#[repr(transparent)]
#[pin_data]
#[repr(C)]
pub struct Timer<U> {
#[pin]
timer: Opaque<bindings::hrtimer>,
+ // This field goes away when `bindings::hrtimer_setup` is added.
+ mode: TimerMode,
_t: PhantomData<U>,
}
@@ -56,7 +57,7 @@ unsafe impl<U> Sync for Timer<U> {}
impl<T> Timer<T> {
/// Return an initializer for a new timer instance.
- pub fn new() -> impl PinInit<Self>
+ pub fn new(mode: TimerMode) -> impl PinInit<Self>
where
T: TimerCallback,
{
@@ -70,7 +71,7 @@ pub fn new() -> impl PinInit<Self>
bindings::hrtimer_init(
place,
bindings::CLOCK_MONOTONIC as i32,
- bindings::hrtimer_mode_HRTIMER_MODE_REL,
+ mode.into(),
);
}
@@ -83,6 +84,7 @@ pub fn new() -> impl PinInit<Self>
// exclusive access.
unsafe { core::ptr::write(function, Some(T::CallbackTarget::run)) };
}),
+ mode: mode,
_t: PhantomData,
})
}
@@ -330,7 +332,7 @@ unsafe fn start(self_ptr: *const Self, expires: Ktime) {
Self::c_timer_ptr(self_ptr).cast_mut(),
expires.to_ns(),
0,
- bindings::hrtimer_mode_HRTIMER_MODE_REL,
+ (*Self::raw_get_timer(self_ptr)).mode.into(),
);
}
}
@@ -362,6 +364,84 @@ fn from(value: TimerRestart) -> Self {
}
}
+/// Operational mode of [`Timer`].
+#[derive(Clone, Copy)]
+pub enum TimerMode {
+ /// Timer expires at the given expiration time.
+ Absolute,
+ /// Timer expires after the given expiration time interpreted as a duration from now.
+ Relative,
+ /// Timer does not move between CPU cores.
+ Pinned,
+ /// Timer handler is executed in soft irq context.
+ Soft,
+ /// Timer handler is executed in hard irq context.
+ Hard,
+ /// Timer expires at the given expiration time.
+ /// Timer does not move between CPU cores.
+ AbsolutePinned,
+ /// Timer expires after the given expiration time interpreted as a duration from now.
+ /// Timer does not move between CPU cores.
+ RelativePinned,
+ /// Timer expires at the given expiration time.
+ /// Timer handler is executed in soft irq context.
+ AbsoluteSoft,
+ /// Timer expires after the given expiration time interpreted as a duration from now.
+ /// Timer handler is executed in soft irq context.
+ RelativeSoft,
+ /// Timer expires at the given expiration time.
+ /// Timer does not move between CPU cores.
+ /// Timer handler is executed in soft irq context.
+ AbsolutePinnedSoft,
+ /// Timer expires after the given expiration time interpreted as a duration from now.
+ /// Timer does not move between CPU cores.
+ /// Timer handler is executed in soft irq context.
+ RelativePinnedSoft,
+ /// Timer expires at the given expiration time.
+ /// Timer handler is executed in hard irq context.
+ AbsoluteHard,
+ /// Timer expires after the given expiration time interpreted as a duration from now.
+ /// Timer handler is executed in hard irq context.
+ RelativeHard,
+ /// Timer expires at the given expiration time.
+ /// Timer does not move between CPU cores.
+ /// Timer handler is executed in hard irq context.
+ AbsolutePinnedHard,
+ /// Timer expires after the given expiration time interpreted as a duration from now.
+ /// Timer does not move between CPU cores.
+ /// Timer handler is executed in hard irq context.
+ RelativePinnedHard,
+}
+
+impl From<TimerMode> for bindings::hrtimer_mode {
+ fn from(value: TimerMode) -> Self {
+ use bindings::*;
+ match value {
+ TimerMode::Absolute => hrtimer_mode_HRTIMER_MODE_ABS,
+ TimerMode::Relative => hrtimer_mode_HRTIMER_MODE_REL,
+ TimerMode::Pinned => hrtimer_mode_HRTIMER_MODE_PINNED,
+ TimerMode::Soft => hrtimer_mode_HRTIMER_MODE_SOFT,
+ TimerMode::Hard => hrtimer_mode_HRTIMER_MODE_HARD,
+ TimerMode::AbsolutePinned => hrtimer_mode_HRTIMER_MODE_ABS_PINNED,
+ TimerMode::RelativePinned => hrtimer_mode_HRTIMER_MODE_REL_PINNED,
+ TimerMode::AbsoluteSoft => hrtimer_mode_HRTIMER_MODE_ABS_SOFT,
+ TimerMode::RelativeSoft => hrtimer_mode_HRTIMER_MODE_REL_SOFT,
+ TimerMode::AbsolutePinnedSoft => hrtimer_mode_HRTIMER_MODE_ABS_PINNED_SOFT,
+ TimerMode::RelativePinnedSoft => hrtimer_mode_HRTIMER_MODE_REL_PINNED_SOFT,
+ TimerMode::AbsoluteHard => hrtimer_mode_HRTIMER_MODE_ABS_HARD,
+ TimerMode::RelativeHard => hrtimer_mode_HRTIMER_MODE_REL_HARD,
+ TimerMode::AbsolutePinnedHard => hrtimer_mode_HRTIMER_MODE_ABS_PINNED_HARD,
+ TimerMode::RelativePinnedHard => hrtimer_mode_HRTIMER_MODE_REL_PINNED_HARD,
+ }
+ }
+}
+
+impl From<TimerMode> for u64 {
+ fn from(value: TimerMode) -> Self {
+ Into::<bindings::hrtimer_mode>::into(value) as u64
+ }
+}
+
/// Use to implement the [`HasTimer<T>`] trait.
///
/// See [`module`] documentation for an example.
--
2.46.0
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