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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116// SPDX-License-Identifier: GPL-2.0
use super::HasHrTimer;use super::HrTimer;use super::HrTimerCallback;use super::HrTimerCallbackContext;use super::HrTimerHandle;use super::HrTimerMode;use super::RawHrTimerCallback;use super::UnsafeHrTimerPointer;use core::pin::Pin;
/// A handle for a `Pin<&HasHrTimer>`. When the handle exists, the timer might be/// running.pub struct PinHrTimerHandle<'a, T>where T: HasHrTimer<T>,{ pub(crate) inner: Pin<&'a T>,}
// SAFETY: We cancel the timer when the handle is dropped. The implementation of// the `cancel` method will block if the timer handler is running.unsafe impl<'a, T> HrTimerHandle for PinHrTimerHandle<'a, T>where T: HasHrTimer<T>,{ fn cancel(&mut self) -> bool { let self_ptr: *const T = self.inner.get_ref();
// SAFETY: As we got `self_ptr` from a reference above, it must point to // a valid `T`. let timer_ptr = unsafe { <T as HasHrTimer<T>>::raw_get_timer(self_ptr) };
// SAFETY: As `timer_ptr` is derived from a reference, it must point to // a valid and initialized `HrTimer`. unsafe { HrTimer::<T>::raw_cancel(timer_ptr) } }}
impl<'a, T> Drop for PinHrTimerHandle<'a, T>where T: HasHrTimer<T>,{ fn drop(&mut self) { self.cancel(); }}
// SAFETY: We capture the lifetime of `Self` when we create a `PinHrTimerHandle`,// so `Self` will outlive the handle.unsafe impl<'a, T> UnsafeHrTimerPointer for Pin<&'a T>where T: Send + Sync, T: HasHrTimer<T>, T: HrTimerCallback<Pointer<'a> = Self>,{ type TimerMode = <T as HasHrTimer<T>>::TimerMode; type TimerHandle = PinHrTimerHandle<'a, T>;
unsafe fn start( self, expires: <<T as HasHrTimer<T>>::TimerMode as HrTimerMode>::Expires, ) -> Self::TimerHandle { // Cast to pointer let self_ptr: *const T = self.get_ref();
// SAFETY: // - As we derive `self_ptr` from a reference above, it must point to a // valid `T`. // - We keep `self` alive by wrapping it in a handle below. unsafe { T::start(self_ptr, expires) };
PinHrTimerHandle { inner: self } }}
impl<'a, T> RawHrTimerCallback for Pin<&'a T>where T: HasHrTimer<T>, T: HrTimerCallback<Pointer<'a> = Self>,{ type CallbackTarget<'b> = Self;
unsafe extern "C" fn run(ptr: *mut bindings::hrtimer) -> bindings::hrtimer_restart { // `HrTimer` is `repr(C)` let timer_ptr = ptr.cast::<HrTimer<T>>();
// SAFETY: By the safety requirement of this function, `timer_ptr` // points to a `HrTimer<T>` contained in an `T`. let receiver_ptr = unsafe { T::timer_container_of(timer_ptr) };
// SAFETY: // - By the safety requirement of this function, `timer_ptr` // points to a `HrTimer<T>` contained in an `T`. // - As per the safety requirements of the trait `HrTimerHandle`, the // `PinHrTimerHandle` associated with this timer is guaranteed to // be alive until this method returns. That handle borrows the `T` // behind `receiver_ptr`, thus guaranteeing the validity of // the reference created below. let receiver_ref = unsafe { &*receiver_ptr };
// SAFETY: `receiver_ref` only exists as pinned, so it is safe to pin it // here. let receiver_pin = unsafe { Pin::new_unchecked(receiver_ref) };
// SAFETY: // - By C API contract `timer_ptr` is the pointer that we passed when queuing the timer, so // it is a valid pointer to a `HrTimer<T>` embedded in a `T`. // - We are within `RawHrTimerCallback::run` let context = unsafe { HrTimerCallbackContext::from_raw(timer_ptr) };
T::run(receiver_pin, context).into_c() }}