[PATCH v7 12/14] rust: hrtimer: add `HrTimerMode`

[Andreas Hindborg]

Allow selection of timer mode by passing a `HrTimerMode` variant to
`HrTimer::new`.

Signed-off-by: Andreas Hindborg <a.hindborg@xxxxxxxxxx>
---
 rust/kernel/time/hrtimer.rs | 86 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 83 insertions(+), 3 deletions(-)

diff --git a/rust/kernel/time/hrtimer.rs b/rust/kernel/time/hrtimer.rs
index 5eaf86fd099566e9d837a1d394e666fcb8f8dab4..6a7344cb32647b6ed033c22fc3774981708c3a67 100644
--- a/rust/kernel/time/hrtimer.rs
+++ b/rust/kernel/time/hrtimer.rs
@@ -59,6 +59,7 @@
 pub struct HrTimer<T> {
     #[pin]
     timer: Opaque<bindings::hrtimer>,
+    mode: HrTimerMode,
     _t: PhantomData<T>,
 }
 
@@ -72,7 +73,7 @@ unsafe impl<T> Sync for HrTimer<T> {}
 
 impl<T> HrTimer<T> {
     /// Return an initializer for a new timer instance.
-    pub fn new() -> impl PinInit<Self>
+    pub fn new(mode: HrTimerMode) -> impl PinInit<Self>
     where
         T: HrTimerCallback,
     {
@@ -87,10 +88,11 @@ pub fn new() -> impl PinInit<Self>
                         place,
                         Some(T::CallbackTarget::run),
                         bindings::CLOCK_MONOTONIC as i32,
-                        bindings::hrtimer_mode_HRTIMER_MODE_REL,
+                        mode.into(),
                     );
                 }
             }),
+            mode: mode,
             _t: PhantomData,
         })
     }
@@ -336,7 +338,7 @@ 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(),
             );
         }
     }
@@ -368,6 +370,84 @@ fn from(value: HrTimerRestart) -> Self {
     }
 }
 
+/// Operational mode of [`HrTimer`].
+#[derive(Clone, Copy)]
+pub enum HrTimerMode {
+    /// 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<HrTimerMode> for bindings::hrtimer_mode {
+    fn from(value: HrTimerMode) -> Self {
+        use bindings::*;
+        match value {
+            HrTimerMode::Absolute => hrtimer_mode_HRTIMER_MODE_ABS,
+            HrTimerMode::Relative => hrtimer_mode_HRTIMER_MODE_REL,
+            HrTimerMode::Pinned => hrtimer_mode_HRTIMER_MODE_PINNED,
+            HrTimerMode::Soft => hrtimer_mode_HRTIMER_MODE_SOFT,
+            HrTimerMode::Hard => hrtimer_mode_HRTIMER_MODE_HARD,
+            HrTimerMode::AbsolutePinned => hrtimer_mode_HRTIMER_MODE_ABS_PINNED,
+            HrTimerMode::RelativePinned => hrtimer_mode_HRTIMER_MODE_REL_PINNED,
+            HrTimerMode::AbsoluteSoft => hrtimer_mode_HRTIMER_MODE_ABS_SOFT,
+            HrTimerMode::RelativeSoft => hrtimer_mode_HRTIMER_MODE_REL_SOFT,
+            HrTimerMode::AbsolutePinnedSoft => hrtimer_mode_HRTIMER_MODE_ABS_PINNED_SOFT,
+            HrTimerMode::RelativePinnedSoft => hrtimer_mode_HRTIMER_MODE_REL_PINNED_SOFT,
+            HrTimerMode::AbsoluteHard => hrtimer_mode_HRTIMER_MODE_ABS_HARD,
+            HrTimerMode::RelativeHard => hrtimer_mode_HRTIMER_MODE_REL_HARD,
+            HrTimerMode::AbsolutePinnedHard => hrtimer_mode_HRTIMER_MODE_ABS_PINNED_HARD,
+            HrTimerMode::RelativePinnedHard => hrtimer_mode_HRTIMER_MODE_REL_PINNED_HARD,
+        }
+    }
+}
+
+impl From<HrTimerMode> for u64 {
+    fn from(value: HrTimerMode) -> Self {
+        Into::<bindings::hrtimer_mode>::into(value) as u64
+    }
+}
+
 /// Use to implement the [`HasHrTimer<T>`] trait.
 ///
 /// See [`module`] documentation for an example.

-- 
2.47.0