// SPDX-License-Identifier: GPL-2.0 use super::{    HasHrTimer, HrTimer, HrTimerCallback, HrTimerCallbackContext, HrTimerHandle, HrTimerMode,    RawHrTimerCallback, UnsafeHrTimerPointer,};use core::{marker::PhantomData, pin::Pin, ptr::NonNull}; /// A handle for a `Pin<&mut HasHrTimer>`. When the handle exists, the timer might/// be running.pub struct PinMutHrTimerHandle<'a, T>where    T: HasHrTimer<T>,{    pub(crate) inner: NonNull<T>,    _p: PhantomData<&'a mut 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 PinMutHrTimerHandle<'a, T>where    T: HasHrTimer<T>,{    fn cancel(&mut self) -> bool {        let self_ptr = self.inner.as_ptr();         // 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 PinMutHrTimerHandle<'a, T>where    T: HasHrTimer<T>,{    fn drop(&mut self) {        self.cancel();    }} // SAFETY: We capture the lifetime of `Self` when we create a// `PinMutHrTimerHandle`, so `Self` will outlive the handle.unsafe impl<'a, T> UnsafeHrTimerPointer for Pin<&'a mut T>where    T: Send + Sync,    T: HasHrTimer<T>,    T: HrTimerCallback<Pointer<'a> = Self>,{    type TimerMode = <T as HasHrTimer<T>>::TimerMode;    type TimerHandle = PinMutHrTimerHandle<'a, T>;     unsafe fn start(        mut self,        expires: <<T as HasHrTimer<T>>::TimerMode as HrTimerMode>::Expires,    ) -> Self::TimerHandle {        // SAFETY:        // - We promise not to move out of `self`. We only pass `self`        //   back to the caller as a `Pin<&mut self>`.        // - The return value of `get_unchecked_mut` is guaranteed not to be null.        let self_ptr = unsafe { NonNull::new_unchecked(self.as_mut().get_unchecked_mut()) };         // 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.as_ptr(), expires) };         PinMutHrTimerHandle {            inner: self_ptr,            _p: PhantomData,        }    }} impl<'a, T> RawHrTimerCallback for Pin<&'a mut 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        //    `PinMutHrTimerHandle` associated with this timer is guaranteed to        //    be alive until this method returns. That handle borrows the `T`        //    behind `receiver_ptr` mutably thus guaranteeing the validity of        //    the reference created below.        let receiver_ref = unsafe { &mut *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()    }}