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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132// 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::HrTimerPointer;use super::RawHrTimerCallback;use crate::prelude::*;use core::ptr::NonNull;
/// A handle for a [`Box<HasHrTimer<T>>`] returned by a call to/// [`HrTimerPointer::start`].////// # Invariants////// - `self.inner` comes from a `Box::into_raw` call.pub struct BoxHrTimerHandle<T, A>where T: HasHrTimer<T>, A: crate::alloc::Allocator,{ pub(crate) inner: NonNull<T>, _p: core::marker::PhantomData<A>,}
// SAFETY: We implement drop below, and we cancel the timer in the drop// implementation.unsafe impl<T, A> HrTimerHandle for BoxHrTimerHandle<T, A>where T: HasHrTimer<T>, A: crate::alloc::Allocator,{ fn cancel(&mut self) -> bool { // SAFETY: As we obtained `self.inner` from a valid reference when we // created `self`, it must point to a valid `T`. let timer_ptr = unsafe { <T as HasHrTimer<T>>::raw_get_timer(self.inner.as_ptr()) };
// SAFETY: As `timer_ptr` points into `T` and `T` is valid, `timer_ptr` // must point to a valid `HrTimer` instance. unsafe { HrTimer::<T>::raw_cancel(timer_ptr) } }}
impl<T, A> Drop for BoxHrTimerHandle<T, A>where T: HasHrTimer<T>, A: crate::alloc::Allocator,{ fn drop(&mut self) { self.cancel(); // SAFETY: By type invariant, `self.inner` came from a `Box::into_raw` // call. drop(unsafe { Box::<T, A>::from_raw(self.inner.as_ptr()) }) }}
impl<T, A> HrTimerPointer for Pin<Box<T, A>>where T: 'static, T: Send + Sync, T: HasHrTimer<T>, T: for<'a> HrTimerCallback<Pointer<'a> = Pin<Box<T, A>>>, A: crate::alloc::Allocator,{ type TimerMode = <T as HasHrTimer<T>>::TimerMode; type TimerHandle = BoxHrTimerHandle<T, A>;
fn start( self, expires: <<T as HasHrTimer<T>>::TimerMode as HrTimerMode>::Expires, ) -> Self::TimerHandle { // SAFETY: // - We will not move out of this box during timer callback (we pass an // immutable reference to the callback). // - `Box::into_raw` is guaranteed to return a valid pointer. let inner = unsafe { NonNull::new_unchecked(Box::into_raw(Pin::into_inner_unchecked(self))) };
// SAFETY: // - We keep `self` alive by wrapping it in a handle below. // - Since we generate the pointer passed to `start` from a valid // reference, it is a valid pointer. unsafe { T::start(inner.as_ptr(), expires) };
// INVARIANT: `inner` came from `Box::into_raw` above. BoxHrTimerHandle { inner, _p: core::marker::PhantomData, } }}
impl<T, A> RawHrTimerCallback for Pin<Box<T, A>>where T: 'static, T: HasHrTimer<T>, T: for<'a> HrTimerCallback<Pointer<'a> = Pin<Box<T, A>>>, A: crate::alloc::Allocator,{ type CallbackTarget<'a> = Pin<&'a mut T>;
unsafe extern "C" fn run(ptr: *mut bindings::hrtimer) -> bindings::hrtimer_restart { // `HrTimer` is `repr(C)` let timer_ptr = ptr.cast::<super::HrTimer<T>>();
// SAFETY: By C API contract `ptr` is the pointer we passed when // queuing the timer, so it is a `HrTimer<T>` embedded in a `T`. let data_ptr = unsafe { T::timer_container_of(timer_ptr) };
// SAFETY: // - As per the safety requirements of the trait `HrTimerHandle`, the // `BoxHrTimerHandle` associated with this timer is guaranteed to // be alive until this method returns. That handle owns the `T` // behind `data_ptr` thus guaranteeing the validity of // the reference created below. // - As `data_ptr` comes from a `Pin<Box<T>>`, only pinned references to // `data_ptr` exist. let data_mut_ref = unsafe { Pin::new_unchecked(&mut *data_ptr) };
// 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(data_mut_ref, context).into_c() }}