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-rw-r--r--rust/kernel/alloc.rs73
-rw-r--r--rust/kernel/alloc/allocator.rs (renamed from rust/kernel/allocator.rs)19
-rw-r--r--rust/kernel/alloc/box_ext.rs56
-rw-r--r--rust/kernel/alloc/vec_ext.rs185
-rw-r--r--rust/kernel/error.rs14
-rw-r--r--rust/kernel/init.rs63
-rw-r--r--rust/kernel/init/macros.rs47
-rw-r--r--rust/kernel/lib.rs13
-rw-r--r--rust/kernel/net/phy.rs2
-rw-r--r--rust/kernel/prelude.rs2
-rw-r--r--rust/kernel/print.rs5
-rw-r--r--rust/kernel/std_vendor.rs7
-rw-r--r--rust/kernel/str.rs98
-rw-r--r--rust/kernel/sync.rs6
-rw-r--r--rust/kernel/sync/arc.rs189
-rw-r--r--rust/kernel/sync/condvar.rs3
-rw-r--r--rust/kernel/sync/lock.rs2
-rw-r--r--rust/kernel/sync/lock/mutex.rs4
-rw-r--r--rust/kernel/sync/lock/spinlock.rs4
-rw-r--r--rust/kernel/task.rs2
-rw-r--r--rust/kernel/time.rs63
-rw-r--r--rust/kernel/types.rs6
-rw-r--r--rust/kernel/workqueue.rs54
23 files changed, 743 insertions, 174 deletions
diff --git a/rust/kernel/alloc.rs b/rust/kernel/alloc.rs
new file mode 100644
index 0000000000..531b5e471c
--- /dev/null
+++ b/rust/kernel/alloc.rs
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Extensions to the [`alloc`] crate.
+
+#[cfg(not(test))]
+#[cfg(not(testlib))]
+mod allocator;
+pub mod box_ext;
+pub mod vec_ext;
+
+/// Indicates an allocation error.
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+pub struct AllocError;
+
+/// Flags to be used when allocating memory.
+///
+/// They can be combined with the operators `|`, `&`, and `!`.
+///
+/// Values can be used from the [`flags`] module.
+#[derive(Clone, Copy)]
+pub struct Flags(u32);
+
+impl core::ops::BitOr for Flags {
+ type Output = Self;
+ fn bitor(self, rhs: Self) -> Self::Output {
+ Self(self.0 | rhs.0)
+ }
+}
+
+impl core::ops::BitAnd for Flags {
+ type Output = Self;
+ fn bitand(self, rhs: Self) -> Self::Output {
+ Self(self.0 & rhs.0)
+ }
+}
+
+impl core::ops::Not for Flags {
+ type Output = Self;
+ fn not(self) -> Self::Output {
+ Self(!self.0)
+ }
+}
+
+/// Allocation flags.
+///
+/// These are meant to be used in functions that can allocate memory.
+pub mod flags {
+ use super::Flags;
+
+ /// Zeroes out the allocated memory.
+ ///
+ /// This is normally or'd with other flags.
+ pub const __GFP_ZERO: Flags = Flags(bindings::__GFP_ZERO);
+
+ /// Users can not sleep and need the allocation to succeed.
+ ///
+ /// A lower watermark is applied to allow access to "atomic reserves". The current
+ /// implementation doesn't support NMI and few other strict non-preemptive contexts (e.g.
+ /// raw_spin_lock). The same applies to [`GFP_NOWAIT`].
+ pub const GFP_ATOMIC: Flags = Flags(bindings::GFP_ATOMIC);
+
+ /// Typical for kernel-internal allocations. The caller requires ZONE_NORMAL or a lower zone
+ /// for direct access but can direct reclaim.
+ pub const GFP_KERNEL: Flags = Flags(bindings::GFP_KERNEL);
+
+ /// The same as [`GFP_KERNEL`], except the allocation is accounted to kmemcg.
+ pub const GFP_KERNEL_ACCOUNT: Flags = Flags(bindings::GFP_KERNEL_ACCOUNT);
+
+ /// Ror kernel allocations that should not stall for direct reclaim, start physical IO or
+ /// use any filesystem callback. It is very likely to fail to allocate memory, even for very
+ /// small allocations.
+ pub const GFP_NOWAIT: Flags = Flags(bindings::GFP_NOWAIT);
+}
diff --git a/rust/kernel/allocator.rs b/rust/kernel/alloc/allocator.rs
index 01ad139e19..229642960c 100644
--- a/rust/kernel/allocator.rs
+++ b/rust/kernel/alloc/allocator.rs
@@ -2,11 +2,10 @@
//! Allocator support.
+use super::{flags::*, Flags};
use core::alloc::{GlobalAlloc, Layout};
use core::ptr;
-use crate::bindings;
-
struct KernelAllocator;
/// Calls `krealloc` with a proper size to alloc a new object aligned to `new_layout`'s alignment.
@@ -15,7 +14,7 @@ struct KernelAllocator;
///
/// - `ptr` can be either null or a pointer which has been allocated by this allocator.
/// - `new_layout` must have a non-zero size.
-unsafe fn krealloc_aligned(ptr: *mut u8, new_layout: Layout, flags: bindings::gfp_t) -> *mut u8 {
+pub(crate) unsafe fn krealloc_aligned(ptr: *mut u8, new_layout: Layout, flags: Flags) -> *mut u8 {
// Customized layouts from `Layout::from_size_align()` can have size < align, so pad first.
let layout = new_layout.pad_to_align();
@@ -36,14 +35,14 @@ unsafe fn krealloc_aligned(ptr: *mut u8, new_layout: Layout, flags: bindings::gf
// function safety requirement.
// - `size` is greater than 0 since it's either a `layout.size()` (which cannot be zero
// according to the function safety requirement) or a result from `next_power_of_two()`.
- unsafe { bindings::krealloc(ptr as *const core::ffi::c_void, size, flags) as *mut u8 }
+ unsafe { bindings::krealloc(ptr as *const core::ffi::c_void, size, flags.0) as *mut u8 }
}
unsafe impl GlobalAlloc for KernelAllocator {
unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
// SAFETY: `ptr::null_mut()` is null and `layout` has a non-zero size by the function safety
// requirement.
- unsafe { krealloc_aligned(ptr::null_mut(), layout, bindings::GFP_KERNEL) }
+ unsafe { krealloc_aligned(ptr::null_mut(), layout, GFP_KERNEL) }
}
unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
@@ -64,19 +63,13 @@ unsafe impl GlobalAlloc for KernelAllocator {
// requirement.
// - the size of `layout` is not zero because `new_size` is not zero by the function safety
// requirement.
- unsafe { krealloc_aligned(ptr, layout, bindings::GFP_KERNEL) }
+ unsafe { krealloc_aligned(ptr, layout, GFP_KERNEL) }
}
unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
// SAFETY: `ptr::null_mut()` is null and `layout` has a non-zero size by the function safety
// requirement.
- unsafe {
- krealloc_aligned(
- ptr::null_mut(),
- layout,
- bindings::GFP_KERNEL | bindings::__GFP_ZERO,
- )
- }
+ unsafe { krealloc_aligned(ptr::null_mut(), layout, GFP_KERNEL | __GFP_ZERO) }
}
}
diff --git a/rust/kernel/alloc/box_ext.rs b/rust/kernel/alloc/box_ext.rs
new file mode 100644
index 0000000000..829cb1c1cf
--- /dev/null
+++ b/rust/kernel/alloc/box_ext.rs
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Extensions to [`Box`] for fallible allocations.
+
+use super::{AllocError, Flags};
+use alloc::boxed::Box;
+use core::mem::MaybeUninit;
+
+/// Extensions to [`Box`].
+pub trait BoxExt<T>: Sized {
+ /// Allocates a new box.
+ ///
+ /// The allocation may fail, in which case an error is returned.
+ fn new(x: T, flags: Flags) -> Result<Self, AllocError>;
+
+ /// Allocates a new uninitialised box.
+ ///
+ /// The allocation may fail, in which case an error is returned.
+ fn new_uninit(flags: Flags) -> Result<Box<MaybeUninit<T>>, AllocError>;
+}
+
+impl<T> BoxExt<T> for Box<T> {
+ fn new(x: T, flags: Flags) -> Result<Self, AllocError> {
+ let b = <Self as BoxExt<_>>::new_uninit(flags)?;
+ Ok(Box::write(b, x))
+ }
+
+ #[cfg(any(test, testlib))]
+ fn new_uninit(_flags: Flags) -> Result<Box<MaybeUninit<T>>, AllocError> {
+ Ok(Box::new_uninit())
+ }
+
+ #[cfg(not(any(test, testlib)))]
+ fn new_uninit(flags: Flags) -> Result<Box<MaybeUninit<T>>, AllocError> {
+ let ptr = if core::mem::size_of::<MaybeUninit<T>>() == 0 {
+ core::ptr::NonNull::<_>::dangling().as_ptr()
+ } else {
+ let layout = core::alloc::Layout::new::<MaybeUninit<T>>();
+
+ // SAFETY: Memory is being allocated (first arg is null). The only other source of
+ // safety issues is sleeping on atomic context, which is addressed by klint. Lastly,
+ // the type is not a SZT (checked above).
+ let ptr =
+ unsafe { super::allocator::krealloc_aligned(core::ptr::null_mut(), layout, flags) };
+ if ptr.is_null() {
+ return Err(AllocError);
+ }
+
+ ptr.cast::<MaybeUninit<T>>()
+ };
+
+ // SAFETY: For non-zero-sized types, we allocate above using the global allocator. For
+ // zero-sized types, we use `NonNull::dangling`.
+ Ok(unsafe { Box::from_raw(ptr) })
+ }
+}
diff --git a/rust/kernel/alloc/vec_ext.rs b/rust/kernel/alloc/vec_ext.rs
new file mode 100644
index 0000000000..1297a4be32
--- /dev/null
+++ b/rust/kernel/alloc/vec_ext.rs
@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Extensions to [`Vec`] for fallible allocations.
+
+use super::{AllocError, Flags};
+use alloc::vec::Vec;
+
+/// Extensions to [`Vec`].
+pub trait VecExt<T>: Sized {
+ /// Creates a new [`Vec`] instance with at least the given capacity.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let v = Vec::<u32>::with_capacity(20, GFP_KERNEL)?;
+ ///
+ /// assert!(v.capacity() >= 20);
+ /// # Ok::<(), Error>(())
+ /// ```
+ fn with_capacity(capacity: usize, flags: Flags) -> Result<Self, AllocError>;
+
+ /// Appends an element to the back of the [`Vec`] instance.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let mut v = Vec::new();
+ /// v.push(1, GFP_KERNEL)?;
+ /// assert_eq!(&v, &[1]);
+ ///
+ /// v.push(2, GFP_KERNEL)?;
+ /// assert_eq!(&v, &[1, 2]);
+ /// # Ok::<(), Error>(())
+ /// ```
+ fn push(&mut self, v: T, flags: Flags) -> Result<(), AllocError>;
+
+ /// Pushes clones of the elements of slice into the [`Vec`] instance.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let mut v = Vec::new();
+ /// v.push(1, GFP_KERNEL)?;
+ ///
+ /// v.extend_from_slice(&[20, 30, 40], GFP_KERNEL)?;
+ /// assert_eq!(&v, &[1, 20, 30, 40]);
+ ///
+ /// v.extend_from_slice(&[50, 60], GFP_KERNEL)?;
+ /// assert_eq!(&v, &[1, 20, 30, 40, 50, 60]);
+ /// # Ok::<(), Error>(())
+ /// ```
+ fn extend_from_slice(&mut self, other: &[T], flags: Flags) -> Result<(), AllocError>
+ where
+ T: Clone;
+
+ /// Ensures that the capacity exceeds the length by at least `additional` elements.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let mut v = Vec::new();
+ /// v.push(1, GFP_KERNEL)?;
+ ///
+ /// v.reserve(10, GFP_KERNEL)?;
+ /// let cap = v.capacity();
+ /// assert!(cap >= 10);
+ ///
+ /// v.reserve(10, GFP_KERNEL)?;
+ /// let new_cap = v.capacity();
+ /// assert_eq!(new_cap, cap);
+ ///
+ /// # Ok::<(), Error>(())
+ /// ```
+ fn reserve(&mut self, additional: usize, flags: Flags) -> Result<(), AllocError>;
+}
+
+impl<T> VecExt<T> for Vec<T> {
+ fn with_capacity(capacity: usize, flags: Flags) -> Result<Self, AllocError> {
+ let mut v = Vec::new();
+ <Self as VecExt<_>>::reserve(&mut v, capacity, flags)?;
+ Ok(v)
+ }
+
+ fn push(&mut self, v: T, flags: Flags) -> Result<(), AllocError> {
+ <Self as VecExt<_>>::reserve(self, 1, flags)?;
+ let s = self.spare_capacity_mut();
+ s[0].write(v);
+
+ // SAFETY: We just initialised the first spare entry, so it is safe to increase the length
+ // by 1. We also know that the new length is <= capacity because of the previous call to
+ // `reserve` above.
+ unsafe { self.set_len(self.len() + 1) };
+ Ok(())
+ }
+
+ fn extend_from_slice(&mut self, other: &[T], flags: Flags) -> Result<(), AllocError>
+ where
+ T: Clone,
+ {
+ <Self as VecExt<_>>::reserve(self, other.len(), flags)?;
+ for (slot, item) in core::iter::zip(self.spare_capacity_mut(), other) {
+ slot.write(item.clone());
+ }
+
+ // SAFETY: We just initialised the `other.len()` spare entries, so it is safe to increase
+ // the length by the same amount. We also know that the new length is <= capacity because
+ // of the previous call to `reserve` above.
+ unsafe { self.set_len(self.len() + other.len()) };
+ Ok(())
+ }
+
+ #[cfg(any(test, testlib))]
+ fn reserve(&mut self, additional: usize, _flags: Flags) -> Result<(), AllocError> {
+ Vec::reserve(self, additional);
+ Ok(())
+ }
+
+ #[cfg(not(any(test, testlib)))]
+ fn reserve(&mut self, additional: usize, flags: Flags) -> Result<(), AllocError> {
+ let len = self.len();
+ let cap = self.capacity();
+
+ if cap - len >= additional {
+ return Ok(());
+ }
+
+ if core::mem::size_of::<T>() == 0 {
+ // The capacity is already `usize::MAX` for SZTs, we can't go higher.
+ return Err(AllocError);
+ }
+
+ // We know cap is <= `isize::MAX` because `Layout::array` fails if the resulting byte size
+ // is greater than `isize::MAX`. So the multiplication by two won't overflow.
+ let new_cap = core::cmp::max(cap * 2, len.checked_add(additional).ok_or(AllocError)?);
+ let layout = core::alloc::Layout::array::<T>(new_cap).map_err(|_| AllocError)?;
+
+ let (old_ptr, len, cap) = destructure(self);
+
+ // We need to make sure that `ptr` is either NULL or comes from a previous call to
+ // `krealloc_aligned`. A `Vec<T>`'s `ptr` value is not guaranteed to be NULL and might be
+ // dangling after being created with `Vec::new`. Instead, we can rely on `Vec<T>`'s capacity
+ // to be zero if no memory has been allocated yet.
+ let ptr = if cap == 0 {
+ core::ptr::null_mut()
+ } else {
+ old_ptr
+ };
+
+ // SAFETY: `ptr` is valid because it's either NULL or comes from a previous call to
+ // `krealloc_aligned`. We also verified that the type is not a ZST.
+ let new_ptr = unsafe { super::allocator::krealloc_aligned(ptr.cast(), layout, flags) };
+ if new_ptr.is_null() {
+ // SAFETY: We are just rebuilding the existing `Vec` with no changes.
+ unsafe { rebuild(self, old_ptr, len, cap) };
+ Err(AllocError)
+ } else {
+ // SAFETY: `ptr` has been reallocated with the layout for `new_cap` elements. New cap
+ // is greater than `cap`, so it continues to be >= `len`.
+ unsafe { rebuild(self, new_ptr.cast::<T>(), len, new_cap) };
+ Ok(())
+ }
+ }
+}
+
+#[cfg(not(any(test, testlib)))]
+fn destructure<T>(v: &mut Vec<T>) -> (*mut T, usize, usize) {
+ let mut tmp = Vec::new();
+ core::mem::swap(&mut tmp, v);
+ let mut tmp = core::mem::ManuallyDrop::new(tmp);
+ let len = tmp.len();
+ let cap = tmp.capacity();
+ (tmp.as_mut_ptr(), len, cap)
+}
+
+/// Rebuilds a `Vec` from a pointer, length, and capacity.
+///
+/// # Safety
+///
+/// The same as [`Vec::from_raw_parts`].
+#[cfg(not(any(test, testlib)))]
+unsafe fn rebuild<T>(v: &mut Vec<T>, ptr: *mut T, len: usize, cap: usize) {
+ // SAFETY: The safety requirements from this function satisfy those of `from_raw_parts`.
+ let mut tmp = unsafe { Vec::from_raw_parts(ptr, len, cap) };
+ core::mem::swap(&mut tmp, v);
+}
diff --git a/rust/kernel/error.rs b/rust/kernel/error.rs
index 4786d3ee1e..55280ae9fe 100644
--- a/rust/kernel/error.rs
+++ b/rust/kernel/error.rs
@@ -4,14 +4,10 @@
//!
//! C header: [`include/uapi/asm-generic/errno-base.h`](srctree/include/uapi/asm-generic/errno-base.h)
-use crate::str::CStr;
+use crate::{alloc::AllocError, str::CStr};
-use alloc::{
- alloc::{AllocError, LayoutError},
- collections::TryReserveError,
-};
+use alloc::alloc::LayoutError;
-use core::convert::From;
use core::fmt;
use core::num::TryFromIntError;
use core::str::Utf8Error;
@@ -192,12 +188,6 @@ impl From<Utf8Error> for Error {
}
}
-impl From<TryReserveError> for Error {
- fn from(_: TryReserveError) -> Error {
- code::ENOMEM
- }
-}
-
impl From<LayoutError> for Error {
fn from(_: LayoutError) -> Error {
code::ENOMEM
diff --git a/rust/kernel/init.rs b/rust/kernel/init.rs
index 09004b56fb..68605b633e 100644
--- a/rust/kernel/init.rs
+++ b/rust/kernel/init.rs
@@ -68,7 +68,7 @@
//! # a <- new_mutex!(42, "Foo::a"),
//! # b: 24,
//! # });
-//! let foo: Result<Pin<Box<Foo>>> = Box::pin_init(foo);
+//! let foo: Result<Pin<Box<Foo>>> = Box::pin_init(foo, GFP_KERNEL);
//! ```
//!
//! For more information see the [`pin_init!`] macro.
@@ -80,14 +80,15 @@
//!
//! ```rust
//! # use kernel::sync::{new_mutex, Arc, Mutex};
-//! let mtx: Result<Arc<Mutex<usize>>> = Arc::pin_init(new_mutex!(42, "example::mtx"));
+//! let mtx: Result<Arc<Mutex<usize>>> =
+//! Arc::pin_init(new_mutex!(42, "example::mtx"), GFP_KERNEL);
//! ```
//!
//! To declare an init macro/function you just return an [`impl PinInit<T, E>`]:
//!
//! ```rust
//! # #![allow(clippy::disallowed_names)]
-//! # use kernel::{sync::Mutex, prelude::*, new_mutex, init::PinInit, try_pin_init};
+//! # use kernel::{sync::Mutex, new_mutex, init::PinInit, try_pin_init};
//! #[pin_data]
//! struct DriverData {
//! #[pin]
@@ -99,7 +100,7 @@
//! fn new() -> impl PinInit<Self, Error> {
//! try_pin_init!(Self {
//! status <- new_mutex!(0, "DriverData::status"),
-//! buffer: Box::init(kernel::init::zeroed())?,
+//! buffer: Box::init(kernel::init::zeroed(), GFP_KERNEL)?,
//! })
//! }
//! }
@@ -121,7 +122,7 @@
//!
//! ```rust
//! # #![allow(unreachable_pub, clippy::disallowed_names)]
-//! use kernel::{prelude::*, init, types::Opaque};
+//! use kernel::{init, types::Opaque};
//! use core::{ptr::addr_of_mut, marker::PhantomPinned, pin::Pin};
//! # mod bindings {
//! # #![allow(non_camel_case_types)]
@@ -210,13 +211,13 @@
//! [`pin_init!`]: crate::pin_init!
use crate::{
+ alloc::{box_ext::BoxExt, AllocError, Flags},
error::{self, Error},
sync::UniqueArc,
types::{Opaque, ScopeGuard},
};
use alloc::boxed::Box;
use core::{
- alloc::AllocError,
cell::UnsafeCell,
convert::Infallible,
marker::PhantomData,
@@ -305,9 +306,9 @@ macro_rules! stack_pin_init {
///
/// stack_try_pin_init!(let foo: Result<Pin<&mut Foo>, AllocError> = pin_init!(Foo {
/// a <- new_mutex!(42),
-/// b: Box::try_new(Bar {
+/// b: Box::new(Bar {
/// x: 64,
-/// })?,
+/// }, GFP_KERNEL)?,
/// }));
/// let foo = foo.unwrap();
/// pr_info!("a: {}", &*foo.a.lock());
@@ -331,9 +332,9 @@ macro_rules! stack_pin_init {
///
/// stack_try_pin_init!(let foo: Pin<&mut Foo> =? pin_init!(Foo {
/// a <- new_mutex!(42),
-/// b: Box::try_new(Bar {
+/// b: Box::new(Bar {
/// x: 64,
-/// })?,
+/// }, GFP_KERNEL)?,
/// }));
/// pr_info!("a: {}", &*foo.a.lock());
/// # Ok::<_, AllocError>(())
@@ -390,7 +391,7 @@ macro_rules! stack_try_pin_init {
/// },
/// });
/// # initializer }
-/// # Box::pin_init(demo()).unwrap();
+/// # Box::pin_init(demo(), GFP_KERNEL).unwrap();
/// ```
///
/// Arbitrary Rust expressions can be used to set the value of a variable.
@@ -412,7 +413,7 @@ macro_rules! stack_try_pin_init {
///
/// ```rust
/// # #![allow(clippy::disallowed_names)]
-/// # use kernel::{init, pin_init, prelude::*, init::*};
+/// # use kernel::{init, pin_init, init::*};
/// # use core::pin::Pin;
/// # #[pin_data]
/// # struct Foo {
@@ -460,7 +461,7 @@ macro_rules! stack_try_pin_init {
/// # })
/// # }
/// # }
-/// let foo = Box::pin_init(Foo::new());
+/// let foo = Box::pin_init(Foo::new(), GFP_KERNEL);
/// ```
///
/// They can also easily embed it into their own `struct`s:
@@ -600,7 +601,7 @@ macro_rules! pin_init {
/// impl BigBuf {
/// fn new() -> impl PinInit<Self, Error> {
/// try_pin_init!(Self {
-/// big: Box::init(init::zeroed())?,
+/// big: Box::init(init::zeroed(), GFP_KERNEL)?,
/// small: [0; 1024 * 1024],
/// ptr: core::ptr::null_mut(),
/// }? Error)
@@ -701,7 +702,7 @@ macro_rules! init {
/// impl BigBuf {
/// fn new() -> impl Init<Self, Error> {
/// try_init!(Self {
-/// big: Box::init(zeroed())?,
+/// big: Box::init(zeroed(), GFP_KERNEL)?,
/// small: [0; 1024 * 1024],
/// }? Error)
/// }
@@ -1013,7 +1014,7 @@ pub fn uninit<T, E>() -> impl Init<MaybeUninit<T>, E> {
///
/// ```rust
/// use kernel::{error::Error, init::init_array_from_fn};
-/// let array: Box<[usize; 1_000]> = Box::init::<Error>(init_array_from_fn(|i| i)).unwrap();
+/// let array: Box<[usize; 1_000]> = Box::init::<Error>(init_array_from_fn(|i| i), GFP_KERNEL).unwrap();
/// assert_eq!(array.len(), 1_000);
/// ```
pub fn init_array_from_fn<I, const N: usize, T, E>(
@@ -1057,7 +1058,7 @@ where
/// ```rust
/// use kernel::{sync::{Arc, Mutex}, init::pin_init_array_from_fn, new_mutex};
/// let array: Arc<[Mutex<usize>; 1_000]> =
-/// Arc::pin_init(pin_init_array_from_fn(|i| new_mutex!(i))).unwrap();
+/// Arc::pin_init(pin_init_array_from_fn(|i| new_mutex!(i)), GFP_KERNEL).unwrap();
/// assert_eq!(array.len(), 1_000);
/// ```
pub fn pin_init_array_from_fn<I, const N: usize, T, E>(
@@ -1115,7 +1116,7 @@ pub trait InPlaceInit<T>: Sized {
/// type.
///
/// If `T: !Unpin` it will not be able to move afterwards.
- fn try_pin_init<E>(init: impl PinInit<T, E>) -> Result<Pin<Self>, E>
+ fn try_pin_init<E>(init: impl PinInit<T, E>, flags: Flags) -> Result<Pin<Self>, E>
where
E: From<AllocError>;
@@ -1123,7 +1124,7 @@ pub trait InPlaceInit<T>: Sized {
/// type.
///
/// If `T: !Unpin` it will not be able to move afterwards.
- fn pin_init<E>(init: impl PinInit<T, E>) -> error::Result<Pin<Self>>
+ fn pin_init<E>(init: impl PinInit<T, E>, flags: Flags) -> error::Result<Pin<Self>>
where
Error: From<E>,
{
@@ -1131,16 +1132,16 @@ pub trait InPlaceInit<T>: Sized {
let init = unsafe {
pin_init_from_closure(|slot| init.__pinned_init(slot).map_err(|e| Error::from(e)))
};
- Self::try_pin_init(init)
+ Self::try_pin_init(init, flags)
}
/// Use the given initializer to in-place initialize a `T`.
- fn try_init<E>(init: impl Init<T, E>) -> Result<Self, E>
+ fn try_init<E>(init: impl Init<T, E>, flags: Flags) -> Result<Self, E>
where
E: From<AllocError>;
/// Use the given initializer to in-place initialize a `T`.
- fn init<E>(init: impl Init<T, E>) -> error::Result<Self>
+ fn init<E>(init: impl Init<T, E>, flags: Flags) -> error::Result<Self>
where
Error: From<E>,
{
@@ -1148,17 +1149,17 @@ pub trait InPlaceInit<T>: Sized {
let init = unsafe {
init_from_closure(|slot| init.__pinned_init(slot).map_err(|e| Error::from(e)))
};
- Self::try_init(init)
+ Self::try_init(init, flags)
}
}
impl<T> InPlaceInit<T> for Box<T> {
#[inline]
- fn try_pin_init<E>(init: impl PinInit<T, E>) -> Result<Pin<Self>, E>
+ fn try_pin_init<E>(init: impl PinInit<T, E>, flags: Flags) -> Result<Pin<Self>, E>
where
E: From<AllocError>,
{
- let mut this = Box::try_new_uninit()?;
+ let mut this = <Box<_> as BoxExt<_>>::new_uninit(flags)?;
let slot = this.as_mut_ptr();
// SAFETY: When init errors/panics, slot will get deallocated but not dropped,
// slot is valid and will not be moved, because we pin it later.
@@ -1168,11 +1169,11 @@ impl<T> InPlaceInit<T> for Box<T> {
}
#[inline]
- fn try_init<E>(init: impl Init<T, E>) -> Result<Self, E>
+ fn try_init<E>(init: impl Init<T, E>, flags: Flags) -> Result<Self, E>
where
E: From<AllocError>,
{
- let mut this = Box::try_new_uninit()?;
+ let mut this = <Box<_> as BoxExt<_>>::new_uninit(flags)?;
let slot = this.as_mut_ptr();
// SAFETY: When init errors/panics, slot will get deallocated but not dropped,
// slot is valid.
@@ -1184,11 +1185,11 @@ impl<T> InPlaceInit<T> for Box<T> {
impl<T> InPlaceInit<T> for UniqueArc<T> {
#[inline]
- fn try_pin_init<E>(init: impl PinInit<T, E>) -> Result<Pin<Self>, E>
+ fn try_pin_init<E>(init: impl PinInit<T, E>, flags: Flags) -> Result<Pin<Self>, E>
where
E: From<AllocError>,
{
- let mut this = UniqueArc::try_new_uninit()?;
+ let mut this = UniqueArc::new_uninit(flags)?;
let slot = this.as_mut_ptr();
// SAFETY: When init errors/panics, slot will get deallocated but not dropped,
// slot is valid and will not be moved, because we pin it later.
@@ -1198,11 +1199,11 @@ impl<T> InPlaceInit<T> for UniqueArc<T> {
}
#[inline]
- fn try_init<E>(init: impl Init<T, E>) -> Result<Self, E>
+ fn try_init<E>(init: impl Init<T, E>, flags: Flags) -> Result<Self, E>
where
E: From<AllocError>,
{
- let mut this = UniqueArc::try_new_uninit()?;
+ let mut this = UniqueArc::new_uninit(flags)?;
let slot = this.as_mut_ptr();
// SAFETY: When init errors/panics, slot will get deallocated but not dropped,
// slot is valid.
diff --git a/rust/kernel/init/macros.rs b/rust/kernel/init/macros.rs
index cb6e61b6c5..02ecedc4ae 100644
--- a/rust/kernel/init/macros.rs
+++ b/rust/kernel/init/macros.rs
@@ -250,7 +250,7 @@
//! // error type is `Infallible`) we will need to drop this field if there
//! // is an error later. This `DropGuard` will drop the field when it gets
//! // dropped and has not yet been forgotten.
-//! let t = unsafe {
+//! let __t_guard = unsafe {
//! ::pinned_init::__internal::DropGuard::new(::core::addr_of_mut!((*slot).t))
//! };
//! // Expansion of `x: 0,`:
@@ -261,14 +261,14 @@
//! unsafe { ::core::ptr::write(::core::addr_of_mut!((*slot).x), x) };
//! }
//! // We again create a `DropGuard`.
-//! let x = unsafe {
+//! let __x_guard = unsafe {
//! ::kernel::init::__internal::DropGuard::new(::core::addr_of_mut!((*slot).x))
//! };
//! // Since initialization has successfully completed, we can now forget
//! // the guards. This is not `mem::forget`, since we only have
//! // `&DropGuard`.
-//! ::core::mem::forget(x);
-//! ::core::mem::forget(t);
+//! ::core::mem::forget(__x_guard);
+//! ::core::mem::forget(__t_guard);
//! // Here we use the type checker to ensure that every field has been
//! // initialized exactly once, since this is `if false` it will never get
//! // executed, but still type-checked.
@@ -461,16 +461,16 @@
//! {
//! unsafe { ::core::ptr::write(::core::addr_of_mut!((*slot).a), a) };
//! }
-//! let a = unsafe {
+//! let __a_guard = unsafe {
//! ::kernel::init::__internal::DropGuard::new(::core::addr_of_mut!((*slot).a))
//! };
//! let init = Bar::new(36);
//! unsafe { data.b(::core::addr_of_mut!((*slot).b), b)? };
-//! let b = unsafe {
+//! let __b_guard = unsafe {
//! ::kernel::init::__internal::DropGuard::new(::core::addr_of_mut!((*slot).b))
//! };
-//! ::core::mem::forget(b);
-//! ::core::mem::forget(a);
+//! ::core::mem::forget(__b_guard);
+//! ::core::mem::forget(__a_guard);
//! #[allow(unreachable_code, clippy::diverging_sub_expression)]
//! let _ = || {
//! unsafe {
@@ -538,6 +538,7 @@ macro_rules! __pin_data {
),
@impl_generics($($impl_generics:tt)*),
@ty_generics($($ty_generics:tt)*),
+ @decl_generics($($decl_generics:tt)*),
@body({ $($fields:tt)* }),
) => {
// We now use token munching to iterate through all of the fields. While doing this we
@@ -560,6 +561,9 @@ macro_rules! __pin_data {
@impl_generics($($impl_generics)*),
// The 'ty generics', the generics that will need to be specified on the impl blocks.
@ty_generics($($ty_generics)*),
+ // The 'decl generics', the generics that need to be specified on the struct
+ // definition.
+ @decl_generics($($decl_generics)*),
// The where clause of any impl block and the declaration.
@where($($($whr)*)?),
// The remaining fields tokens that need to be processed.
@@ -585,6 +589,7 @@ macro_rules! __pin_data {
@name($name:ident),
@impl_generics($($impl_generics:tt)*),
@ty_generics($($ty_generics:tt)*),
+ @decl_generics($($decl_generics:tt)*),
@where($($whr:tt)*),
// We found a PhantomPinned field, this should generally be pinned!
@fields_munch($field:ident : $($($(::)?core::)?marker::)?PhantomPinned, $($rest:tt)*),
@@ -607,6 +612,7 @@ macro_rules! __pin_data {
@name($name),
@impl_generics($($impl_generics)*),
@ty_generics($($ty_generics)*),
+ @decl_generics($($decl_generics)*),
@where($($whr)*),
@fields_munch($($rest)*),
@pinned($($pinned)* $($accum)* $field: ::core::marker::PhantomPinned,),
@@ -623,6 +629,7 @@ macro_rules! __pin_data {
@name($name:ident),
@impl_generics($($impl_generics:tt)*),
@ty_generics($($ty_generics:tt)*),
+ @decl_generics($($decl_generics:tt)*),
@where($($whr:tt)*),
// We reached the field declaration.
@fields_munch($field:ident : $type:ty, $($rest:tt)*),
@@ -640,6 +647,7 @@ macro_rules! __pin_data {
@name($name),
@impl_generics($($impl_generics)*),
@ty_generics($($ty_generics)*),
+ @decl_generics($($decl_generics)*),
@where($($whr)*),
@fields_munch($($rest)*),
@pinned($($pinned)* $($accum)* $field: $type,),
@@ -656,6 +664,7 @@ macro_rules! __pin_data {
@name($name:ident),
@impl_generics($($impl_generics:tt)*),
@ty_generics($($ty_generics:tt)*),
+ @decl_generics($($decl_generics:tt)*),
@where($($whr:tt)*),
// We reached the field declaration.
@fields_munch($field:ident : $type:ty, $($rest:tt)*),
@@ -673,6 +682,7 @@ macro_rules! __pin_data {
@name($name),
@impl_generics($($impl_generics)*),
@ty_generics($($ty_generics)*),
+ @decl_generics($($decl_generics)*),
@where($($whr)*),
@fields_munch($($rest)*),
@pinned($($pinned)*),
@@ -689,6 +699,7 @@ macro_rules! __pin_data {
@name($name:ident),
@impl_generics($($impl_generics:tt)*),
@ty_generics($($ty_generics:tt)*),
+ @decl_generics($($decl_generics:tt)*),
@where($($whr:tt)*),
// We found the `#[pin]` attr.
@fields_munch(#[pin] $($rest:tt)*),
@@ -705,6 +716,7 @@ macro_rules! __pin_data {
@name($name),
@impl_generics($($impl_generics)*),
@ty_generics($($ty_generics)*),
+ @decl_generics($($decl_generics)*),
@where($($whr)*),
@fields_munch($($rest)*),
// We do not include `#[pin]` in the list of attributes, since it is not actually an
@@ -724,6 +736,7 @@ macro_rules! __pin_data {
@name($name:ident),
@impl_generics($($impl_generics:tt)*),
@ty_generics($($ty_generics:tt)*),
+ @decl_generics($($decl_generics:tt)*),
@where($($whr:tt)*),
// We reached the field declaration with visibility, for simplicity we only munch the
// visibility and put it into `$accum`.
@@ -741,6 +754,7 @@ macro_rules! __pin_data {
@name($name),
@impl_generics($($impl_generics)*),
@ty_generics($($ty_generics)*),
+ @decl_generics($($decl_generics)*),
@where($($whr)*),
@fields_munch($field $($rest)*),
@pinned($($pinned)*),
@@ -757,6 +771,7 @@ macro_rules! __pin_data {
@name($name:ident),
@impl_generics($($impl_generics:tt)*),
@ty_generics($($ty_generics:tt)*),
+ @decl_generics($($decl_generics:tt)*),
@where($($whr:tt)*),
// Some other attribute, just put it into `$accum`.
@fields_munch(#[$($attr:tt)*] $($rest:tt)*),
@@ -773,6 +788,7 @@ macro_rules! __pin_data {
@name($name),
@impl_generics($($impl_generics)*),
@ty_generics($($ty_generics)*),
+ @decl_generics($($decl_generics)*),
@where($($whr)*),
@fields_munch($($rest)*),
@pinned($($pinned)*),
@@ -789,6 +805,7 @@ macro_rules! __pin_data {
@name($name:ident),
@impl_generics($($impl_generics:tt)*),
@ty_generics($($ty_generics:tt)*),
+ @decl_generics($($decl_generics:tt)*),
@where($($whr:tt)*),
// We reached the end of the fields, plus an optional additional comma, since we added one
// before and the user is also allowed to put a trailing comma.
@@ -802,7 +819,7 @@ macro_rules! __pin_data {
) => {
// Declare the struct with all fields in the correct order.
$($struct_attrs)*
- $vis struct $name <$($impl_generics)*>
+ $vis struct $name <$($decl_generics)*>
where $($whr)*
{
$($fields)*
@@ -1192,14 +1209,14 @@ macro_rules! __init_internal {
// We use `paste!` to create new hygiene for `$field`.
::kernel::macros::paste! {
// SAFETY: We forget the guard later when initialization has succeeded.
- let [<$field>] = unsafe {
+ let [< __ $field _guard >] = unsafe {
$crate::init::__internal::DropGuard::new(::core::ptr::addr_of_mut!((*$slot).$field))
};
$crate::__init_internal!(init_slot($use_data):
@data($data),
@slot($slot),
- @guards([<$field>], $($guards,)*),
+ @guards([< __ $field _guard >], $($guards,)*),
@munch_fields($($rest)*),
);
}
@@ -1223,14 +1240,14 @@ macro_rules! __init_internal {
// We use `paste!` to create new hygiene for `$field`.
::kernel::macros::paste! {
// SAFETY: We forget the guard later when initialization has succeeded.
- let [<$field>] = unsafe {
+ let [< __ $field _guard >] = unsafe {
$crate::init::__internal::DropGuard::new(::core::ptr::addr_of_mut!((*$slot).$field))
};
$crate::__init_internal!(init_slot():
@data($data),
@slot($slot),
- @guards([<$field>], $($guards,)*),
+ @guards([< __ $field _guard >], $($guards,)*),
@munch_fields($($rest)*),
);
}
@@ -1255,14 +1272,14 @@ macro_rules! __init_internal {
// We use `paste!` to create new hygiene for `$field`.
::kernel::macros::paste! {
// SAFETY: We forget the guard later when initialization has succeeded.
- let [<$field>] = unsafe {
+ let [< __ $field _guard >] = unsafe {
$crate::init::__internal::DropGuard::new(::core::ptr::addr_of_mut!((*$slot).$field))
};
$crate::__init_internal!(init_slot($($use_data)?):
@data($data),
@slot($slot),
- @guards([<$field>], $($guards,)*),
+ @guards([< __ $field _guard >], $($guards,)*),
@munch_fields($($rest)*),
);
}
diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index 6858e2f8a3..fbd91a48ff 100644
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -12,11 +12,9 @@
//! do so first instead of bypassing this crate.
#![no_std]
-#![feature(allocator_api)]
#![feature(coerce_unsized)]
#![feature(dispatch_from_dyn)]
#![feature(new_uninit)]
-#![feature(offset_of)]
#![feature(receiver_trait)]
#![feature(unsize)]
@@ -28,9 +26,7 @@ compile_error!("Missing kernel configuration for conditional compilation");
// Allow proc-macros to refer to `::kernel` inside the `kernel` crate (this crate).
extern crate self as kernel;
-#[cfg(not(test))]
-#[cfg(not(testlib))]
-mod allocator;
+pub mod alloc;
mod build_assert;
pub mod error;
pub mod init;
@@ -92,6 +88,13 @@ impl ThisModule {
pub const unsafe fn from_ptr(ptr: *mut bindings::module) -> ThisModule {
ThisModule(ptr)
}
+
+ /// Access the raw pointer for this module.
+ ///
+ /// It is up to the user to use it correctly.
+ pub const fn as_ptr(&self) -> *mut bindings::module {
+ self.0
+ }
}
#[cfg(not(any(testlib, test)))]
diff --git a/rust/kernel/net/phy.rs b/rust/kernel/net/phy.rs
index 265d0e1c13..fd40b703d2 100644
--- a/rust/kernel/net/phy.rs
+++ b/rust/kernel/net/phy.rs
@@ -6,7 +6,7 @@
//!
//! C headers: [`include/linux/phy.h`](srctree/include/linux/phy.h).
-use crate::{bindings, error::*, prelude::*, str::CStr, types::Opaque};
+use crate::{error::*, prelude::*, types::Opaque};
use core::marker::PhantomData;
diff --git a/rust/kernel/prelude.rs b/rust/kernel/prelude.rs
index ae21600970..b37a0b3180 100644
--- a/rust/kernel/prelude.rs
+++ b/rust/kernel/prelude.rs
@@ -14,6 +14,8 @@
#[doc(no_inline)]
pub use core::pin::Pin;
+pub use crate::alloc::{box_ext::BoxExt, flags::*, vec_ext::VecExt};
+
#[doc(no_inline)]
pub use alloc::{boxed::Box, vec::Vec};
diff --git a/rust/kernel/print.rs b/rust/kernel/print.rs
index 9b13aca832..a78aa3514a 100644
--- a/rust/kernel/print.rs
+++ b/rust/kernel/print.rs
@@ -13,9 +13,6 @@ use core::{
use crate::str::RawFormatter;
-#[cfg(CONFIG_PRINTK)]
-use crate::bindings;
-
// Called from `vsprintf` with format specifier `%pA`.
#[no_mangle]
unsafe extern "C" fn rust_fmt_argument(
@@ -35,8 +32,6 @@ unsafe extern "C" fn rust_fmt_argument(
/// Public but hidden since it should only be used from public macros.
#[doc(hidden)]
pub mod format_strings {
- use crate::bindings;
-
/// The length we copy from the `KERN_*` kernel prefixes.
const LENGTH_PREFIX: usize = 2;
diff --git a/rust/kernel/std_vendor.rs b/rust/kernel/std_vendor.rs
index 388d6a5147..39679a960c 100644
--- a/rust/kernel/std_vendor.rs
+++ b/rust/kernel/std_vendor.rs
@@ -146,15 +146,16 @@ macro_rules! dbg {
// `$val` expression could be a block (`{ .. }`), in which case the `pr_info!`
// will be malformed.
() => {
- $crate::pr_info!("[{}:{}]\n", ::core::file!(), ::core::line!())
+ $crate::pr_info!("[{}:{}:{}]\n", ::core::file!(), ::core::line!(), ::core::column!())
};
($val:expr $(,)?) => {
// Use of `match` here is intentional because it affects the lifetimes
// of temporaries - https://stackoverflow.com/a/48732525/1063961
match $val {
tmp => {
- $crate::pr_info!("[{}:{}] {} = {:#?}\n",
- ::core::file!(), ::core::line!(), ::core::stringify!($val), &tmp);
+ $crate::pr_info!("[{}:{}:{}] {} = {:#?}\n",
+ ::core::file!(), ::core::line!(), ::core::column!(),
+ ::core::stringify!($val), &tmp);
tmp
}
}
diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index 925ced8fdc..bb8d4f4147 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -2,15 +2,12 @@
//! String representations.
-use alloc::alloc::AllocError;
+use crate::alloc::{flags::*, vec_ext::VecExt, AllocError};
use alloc::vec::Vec;
use core::fmt::{self, Write};
-use core::ops::{self, Deref, Index};
+use core::ops::{self, Deref, DerefMut, Index};
-use crate::{
- bindings,
- error::{code::*, Error},
-};
+use crate::error::{code::*, Error};
/// Byte string without UTF-8 validity guarantee.
#[repr(transparent)]
@@ -236,6 +233,19 @@ impl CStr {
unsafe { core::mem::transmute(bytes) }
}
+ /// Creates a mutable [`CStr`] from a `[u8]` without performing any
+ /// additional checks.
+ ///
+ /// # Safety
+ ///
+ /// `bytes` *must* end with a `NUL` byte, and should only have a single
+ /// `NUL` byte (or the string will be truncated).
+ #[inline]
+ pub unsafe fn from_bytes_with_nul_unchecked_mut(bytes: &mut [u8]) -> &mut CStr {
+ // SAFETY: Properties of `bytes` guaranteed by the safety precondition.
+ unsafe { &mut *(bytes as *mut [u8] as *mut CStr) }
+ }
+
/// Returns a C pointer to the string.
#[inline]
pub const fn as_char_ptr(&self) -> *const core::ffi::c_char {
@@ -299,6 +309,70 @@ impl CStr {
pub fn to_cstring(&self) -> Result<CString, AllocError> {
CString::try_from(self)
}
+
+ /// Converts this [`CStr`] to its ASCII lower case equivalent in-place.
+ ///
+ /// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z',
+ /// but non-ASCII letters are unchanged.
+ ///
+ /// To return a new lowercased value without modifying the existing one, use
+ /// [`to_ascii_lowercase()`].
+ ///
+ /// [`to_ascii_lowercase()`]: #method.to_ascii_lowercase
+ pub fn make_ascii_lowercase(&mut self) {
+ // INVARIANT: This doesn't introduce or remove NUL bytes in the C
+ // string.
+ self.0.make_ascii_lowercase();
+ }
+
+ /// Converts this [`CStr`] to its ASCII upper case equivalent in-place.
+ ///
+ /// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z',
+ /// but non-ASCII letters are unchanged.
+ ///
+ /// To return a new uppercased value without modifying the existing one, use
+ /// [`to_ascii_uppercase()`].
+ ///
+ /// [`to_ascii_uppercase()`]: #method.to_ascii_uppercase
+ pub fn make_ascii_uppercase(&mut self) {
+ // INVARIANT: This doesn't introduce or remove NUL bytes in the C
+ // string.
+ self.0.make_ascii_uppercase();
+ }
+
+ /// Returns a copy of this [`CString`] where each character is mapped to its
+ /// ASCII lower case equivalent.
+ ///
+ /// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z',
+ /// but non-ASCII letters are unchanged.
+ ///
+ /// To lowercase the value in-place, use [`make_ascii_lowercase`].
+ ///
+ /// [`make_ascii_lowercase`]: str::make_ascii_lowercase
+ pub fn to_ascii_lowercase(&self) -> Result<CString, AllocError> {
+ let mut s = self.to_cstring()?;
+
+ s.make_ascii_lowercase();
+
+ Ok(s)
+ }
+
+ /// Returns a copy of this [`CString`] where each character is mapped to its
+ /// ASCII upper case equivalent.
+ ///
+ /// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z',
+ /// but non-ASCII letters are unchanged.
+ ///
+ /// To uppercase the value in-place, use [`make_ascii_uppercase`].
+ ///
+ /// [`make_ascii_uppercase`]: str::make_ascii_uppercase
+ pub fn to_ascii_uppercase(&self) -> Result<CString, AllocError> {
+ let mut s = self.to_cstring()?;
+
+ s.make_ascii_uppercase();
+
+ Ok(s)
+ }
}
impl fmt::Display for CStr {
@@ -729,7 +803,7 @@ impl CString {
let size = f.bytes_written();
// Allocate a vector with the required number of bytes, and write to it.
- let mut buf = Vec::try_with_capacity(size)?;
+ let mut buf = <Vec<_> as VecExt<_>>::with_capacity(size, GFP_KERNEL)?;
// SAFETY: The buffer stored in `buf` is at least of size `size` and is valid for writes.
let mut f = unsafe { Formatter::from_buffer(buf.as_mut_ptr(), size) };
f.write_fmt(args)?;
@@ -764,13 +838,21 @@ impl Deref for CString {
}
}
+impl DerefMut for CString {
+ fn deref_mut(&mut self) -> &mut Self::Target {
+ // SAFETY: A `CString` is always NUL-terminated and contains no other
+ // NUL bytes.
+ unsafe { CStr::from_bytes_with_nul_unchecked_mut(self.buf.as_mut_slice()) }
+ }
+}
+
impl<'a> TryFrom<&'a CStr> for CString {
type Error = AllocError;
fn try_from(cstr: &'a CStr) -> Result<CString, AllocError> {
let mut buf = Vec::new();
- buf.try_extend_from_slice(cstr.as_bytes_with_nul())
+ <Vec<_> as VecExt<_>>::extend_from_slice(&mut buf, cstr.as_bytes_with_nul(), GFP_KERNEL)
.map_err(|_| AllocError)?;
// INVARIANT: The `CStr` and `CString` types have the same invariants for
diff --git a/rust/kernel/sync.rs b/rust/kernel/sync.rs
index c983f63fd5..0ab20975a3 100644
--- a/rust/kernel/sync.rs
+++ b/rust/kernel/sync.rs
@@ -37,6 +37,12 @@ impl LockClassKey {
}
}
+impl Default for LockClassKey {
+ fn default() -> Self {
+ Self::new()
+ }
+}
+
/// Defines a new static lock class and returns a pointer to it.
#[doc(hidden)]
#[macro_export]
diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs
index 7d4c4bf583..3673496c23 100644
--- a/rust/kernel/sync/arc.rs
+++ b/rust/kernel/sync/arc.rs
@@ -16,7 +16,7 @@
//! [`Arc`]: https://doc.rust-lang.org/std/sync/struct.Arc.html
use crate::{
- bindings,
+ alloc::{box_ext::BoxExt, AllocError, Flags},
error::{self, Error},
init::{self, InPlaceInit, Init, PinInit},
try_init,
@@ -24,7 +24,7 @@ use crate::{
};
use alloc::boxed::Box;
use core::{
- alloc::{AllocError, Layout},
+ alloc::Layout,
fmt,
marker::{PhantomData, Unsize},
mem::{ManuallyDrop, MaybeUninit},
@@ -57,7 +57,7 @@ mod std_vendor;
/// }
///
/// // Create a refcounted instance of `Example`.
-/// let obj = Arc::try_new(Example { a: 10, b: 20 })?;
+/// let obj = Arc::new(Example { a: 10, b: 20 }, GFP_KERNEL)?;
///
/// // Get a new pointer to `obj` and increment the refcount.
/// let cloned = obj.clone();
@@ -96,7 +96,7 @@ mod std_vendor;
/// }
/// }
///
-/// let obj = Arc::try_new(Example { a: 10, b: 20 })?;
+/// let obj = Arc::new(Example { a: 10, b: 20 }, GFP_KERNEL)?;
/// obj.use_reference();
/// obj.take_over();
/// # Ok::<(), Error>(())
@@ -119,7 +119,7 @@ mod std_vendor;
/// impl MyTrait for Example {}
///
/// // `obj` has type `Arc<Example>`.
-/// let obj: Arc<Example> = Arc::try_new(Example)?;
+/// let obj: Arc<Example> = Arc::new(Example, GFP_KERNEL)?;
///
/// // `coerced` has type `Arc<dyn MyTrait>`.
/// let coerced: Arc<dyn MyTrait> = obj;
@@ -137,6 +137,39 @@ struct ArcInner<T: ?Sized> {
data: T,
}
+impl<T: ?Sized> ArcInner<T> {
+ /// Converts a pointer to the contents of an [`Arc`] into a pointer to the [`ArcInner`].
+ ///
+ /// # Safety
+ ///
+ /// `ptr` must have been returned by a previous call to [`Arc::into_raw`], and the `Arc` must
+ /// not yet have been destroyed.
+ unsafe fn container_of(ptr: *const T) -> NonNull<ArcInner<T>> {
+ let refcount_layout = Layout::new::<bindings::refcount_t>();
+ // SAFETY: The caller guarantees that the pointer is valid.
+ let val_layout = Layout::for_value(unsafe { &*ptr });
+ // SAFETY: We're computing the layout of a real struct that existed when compiling this
+ // binary, so its layout is not so large that it can trigger arithmetic overflow.
+ let val_offset = unsafe { refcount_layout.extend(val_layout).unwrap_unchecked().1 };
+
+ // Pointer casts leave the metadata unchanged. This is okay because the metadata of `T` and
+ // `ArcInner<T>` is the same since `ArcInner` is a struct with `T` as its last field.
+ //
+ // This is documented at:
+ // <https://doc.rust-lang.org/std/ptr/trait.Pointee.html>.
+ let ptr = ptr as *const ArcInner<T>;
+
+ // SAFETY: The pointer is in-bounds of an allocation both before and after offsetting the
+ // pointer, since it originates from a previous call to `Arc::into_raw` on an `Arc` that is
+ // still valid.
+ let ptr = unsafe { ptr.byte_sub(val_offset) };
+
+ // SAFETY: The pointer can't be null since you can't have an `ArcInner<T>` value at the null
+ // address.
+ unsafe { NonNull::new_unchecked(ptr.cast_mut()) }
+ }
+}
+
// This is to allow [`Arc`] (and variants) to be used as the type of `self`.
impl<T: ?Sized> core::ops::Receiver for Arc<T> {}
@@ -162,7 +195,7 @@ unsafe impl<T: ?Sized + Sync + Send> Sync for Arc<T> {}
impl<T> Arc<T> {
/// Constructs a new reference counted instance of `T`.
- pub fn try_new(contents: T) -> Result<Self, AllocError> {
+ pub fn new(contents: T, flags: Flags) -> Result<Self, AllocError> {
// INVARIANT: The refcount is initialised to a non-zero value.
let value = ArcInner {
// SAFETY: There are no safety requirements for this FFI call.
@@ -170,7 +203,7 @@ impl<T> Arc<T> {
data: contents,
};
- let inner = Box::try_new(value)?;
+ let inner = <Box<_> as BoxExt<_>>::new(value, flags)?;
// SAFETY: We just created `inner` with a reference count of 1, which is owned by the new
// `Arc` object.
@@ -181,22 +214,22 @@ impl<T> Arc<T> {
///
/// If `T: !Unpin` it will not be able to move afterwards.
#[inline]
- pub fn pin_init<E>(init: impl PinInit<T, E>) -> error::Result<Self>
+ pub fn pin_init<E>(init: impl PinInit<T, E>, flags: Flags) -> error::Result<Self>
where
Error: From<E>,
{
- UniqueArc::pin_init(init).map(|u| u.into())
+ UniqueArc::pin_init(init, flags).map(|u| u.into())
}
/// Use the given initializer to in-place initialize a `T`.
///
/// This is equivalent to [`Arc<T>::pin_init`], since an [`Arc`] is always pinned.
#[inline]
- pub fn init<E>(init: impl Init<T, E>) -> error::Result<Self>
+ pub fn init<E>(init: impl Init<T, E>, flags: Flags) -> error::Result<Self>
where
Error: From<E>,
{
- UniqueArc::init(init).map(|u| u.into())
+ UniqueArc::init(init, flags).map(|u| u.into())
}
}
@@ -232,27 +265,13 @@ impl<T: ?Sized> Arc<T> {
/// `ptr` must have been returned by a previous call to [`Arc::into_raw`]. Additionally, it
/// must not be called more than once for each previous call to [`Arc::into_raw`].
pub unsafe fn from_raw(ptr: *const T) -> Self {
- let refcount_layout = Layout::new::<bindings::refcount_t>();
- // SAFETY: The caller guarantees that the pointer is valid.
- let val_layout = Layout::for_value(unsafe { &*ptr });
- // SAFETY: We're computing the layout of a real struct that existed when compiling this
- // binary, so its layout is not so large that it can trigger arithmetic overflow.
- let val_offset = unsafe { refcount_layout.extend(val_layout).unwrap_unchecked().1 };
-
- // Pointer casts leave the metadata unchanged. This is okay because the metadata of `T` and
- // `ArcInner<T>` is the same since `ArcInner` is a struct with `T` as its last field.
- //
- // This is documented at:
- // <https://doc.rust-lang.org/std/ptr/trait.Pointee.html>.
- let ptr = ptr as *const ArcInner<T>;
-
- // SAFETY: The pointer is in-bounds of an allocation both before and after offsetting the
- // pointer, since it originates from a previous call to `Arc::into_raw` and is still valid.
- let ptr = unsafe { ptr.byte_sub(val_offset) };
+ // SAFETY: The caller promises that this pointer originates from a call to `into_raw` on an
+ // `Arc` that is still valid.
+ let ptr = unsafe { ArcInner::container_of(ptr) };
// SAFETY: By the safety requirements we know that `ptr` came from `Arc::into_raw`, so the
// reference count held then will be owned by the new `Arc` object.
- unsafe { Self::from_inner(NonNull::new_unchecked(ptr.cast_mut())) }
+ unsafe { Self::from_inner(ptr) }
}
/// Returns an [`ArcBorrow`] from the given [`Arc`].
@@ -271,6 +290,68 @@ impl<T: ?Sized> Arc<T> {
pub fn ptr_eq(this: &Self, other: &Self) -> bool {
core::ptr::eq(this.ptr.as_ptr(), other.ptr.as_ptr())
}
+
+ /// Converts this [`Arc`] into a [`UniqueArc`], or destroys it if it is not unique.
+ ///
+ /// When this destroys the `Arc`, it does so while properly avoiding races. This means that
+ /// this method will never call the destructor of the value.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use kernel::sync::{Arc, UniqueArc};
+ ///
+ /// let arc = Arc::new(42, GFP_KERNEL)?;
+ /// let unique_arc = arc.into_unique_or_drop();
+ ///
+ /// // The above conversion should succeed since refcount of `arc` is 1.
+ /// assert!(unique_arc.is_some());
+ ///
+ /// assert_eq!(*(unique_arc.unwrap()), 42);
+ ///
+ /// # Ok::<(), Error>(())
+ /// ```
+ ///
+ /// ```
+ /// use kernel::sync::{Arc, UniqueArc};
+ ///
+ /// let arc = Arc::new(42, GFP_KERNEL)?;
+ /// let another = arc.clone();
+ ///
+ /// let unique_arc = arc.into_unique_or_drop();
+ ///
+ /// // The above conversion should fail since refcount of `arc` is >1.
+ /// assert!(unique_arc.is_none());
+ ///
+ /// # Ok::<(), Error>(())
+ /// ```
+ pub fn into_unique_or_drop(self) -> Option<Pin<UniqueArc<T>>> {
+ // We will manually manage the refcount in this method, so we disable the destructor.
+ let me = ManuallyDrop::new(self);
+ // SAFETY: We own a refcount, so the pointer is still valid.
+ let refcount = unsafe { me.ptr.as_ref() }.refcount.get();
+
+ // If the refcount reaches a non-zero value, then we have destroyed this `Arc` and will
+ // return without further touching the `Arc`. If the refcount reaches zero, then there are
+ // no other arcs, and we can create a `UniqueArc`.
+ //
+ // SAFETY: We own a refcount, so the pointer is not dangling.
+ let is_zero = unsafe { bindings::refcount_dec_and_test(refcount) };
+ if is_zero {
+ // SAFETY: We have exclusive access to the arc, so we can perform unsynchronized
+ // accesses to the refcount.
+ unsafe { core::ptr::write(refcount, bindings::REFCOUNT_INIT(1)) };
+
+ // INVARIANT: We own the only refcount to this arc, so we may create a `UniqueArc`. We
+ // must pin the `UniqueArc` because the values was previously in an `Arc`, and they pin
+ // their values.
+ Some(Pin::from(UniqueArc {
+ inner: ManuallyDrop::into_inner(me),
+ }))
+ } else {
+ None
+ }
+ }
}
impl<T: 'static> ForeignOwnable for Arc<T> {
@@ -387,7 +468,7 @@ impl<T: ?Sized> From<Pin<UniqueArc<T>>> for Arc<T> {
/// e.into()
/// }
///
-/// let obj = Arc::try_new(Example)?;
+/// let obj = Arc::new(Example, GFP_KERNEL)?;
/// let cloned = do_something(obj.as_arc_borrow());
///
/// // Assert that both `obj` and `cloned` point to the same underlying object.
@@ -411,7 +492,7 @@ impl<T: ?Sized> From<Pin<UniqueArc<T>>> for Arc<T> {
/// }
/// }
///
-/// let obj = Arc::try_new(Example { a: 10, b: 20 })?;
+/// let obj = Arc::new(Example { a: 10, b: 20 }, GFP_KERNEL)?;
/// obj.as_arc_borrow().use_reference();
/// # Ok::<(), Error>(())
/// ```
@@ -453,6 +534,27 @@ impl<T: ?Sized> ArcBorrow<'_, T> {
_p: PhantomData,
}
}
+
+ /// Creates an [`ArcBorrow`] to an [`Arc`] that has previously been deconstructed with
+ /// [`Arc::into_raw`].
+ ///
+ /// # Safety
+ ///
+ /// * The provided pointer must originate from a call to [`Arc::into_raw`].
+ /// * For the duration of the lifetime annotated on this `ArcBorrow`, the reference count must
+ /// not hit zero.
+ /// * For the duration of the lifetime annotated on this `ArcBorrow`, there must not be a
+ /// [`UniqueArc`] reference to this value.
+ pub unsafe fn from_raw(ptr: *const T) -> Self {
+ // SAFETY: The caller promises that this pointer originates from a call to `into_raw` on an
+ // `Arc` that is still valid.
+ let ptr = unsafe { ArcInner::container_of(ptr) };
+
+ // SAFETY: The caller promises that the value remains valid since the reference count must
+ // not hit zero, and no mutable reference will be created since that would involve a
+ // `UniqueArc`.
+ unsafe { Self::new(ptr) }
+ }
}
impl<T: ?Sized> From<ArcBorrow<'_, T>> for Arc<T> {
@@ -499,7 +601,7 @@ impl<T: ?Sized> Deref for ArcBorrow<'_, T> {
/// }
///
/// fn test() -> Result<Arc<Example>> {
-/// let mut x = UniqueArc::try_new(Example { a: 10, b: 20 })?;
+/// let mut x = UniqueArc::new(Example { a: 10, b: 20 }, GFP_KERNEL)?;
/// x.a += 1;
/// x.b += 1;
/// Ok(x.into())
@@ -522,7 +624,7 @@ impl<T: ?Sized> Deref for ArcBorrow<'_, T> {
/// }
///
/// fn test() -> Result<Arc<Example>> {
-/// let x = UniqueArc::try_new_uninit()?;
+/// let x = UniqueArc::new_uninit(GFP_KERNEL)?;
/// Ok(x.write(Example { a: 10, b: 20 }).into())
/// }
///
@@ -542,7 +644,7 @@ impl<T: ?Sized> Deref for ArcBorrow<'_, T> {
/// }
///
/// fn test() -> Result<Arc<Example>> {
-/// let mut pinned = Pin::from(UniqueArc::try_new(Example { a: 10, b: 20 })?);
+/// let mut pinned = Pin::from(UniqueArc::new(Example { a: 10, b: 20 }, GFP_KERNEL)?);
/// // We can modify `pinned` because it is `Unpin`.
/// pinned.as_mut().a += 1;
/// Ok(pinned.into())
@@ -556,21 +658,24 @@ pub struct UniqueArc<T: ?Sized> {
impl<T> UniqueArc<T> {
/// Tries to allocate a new [`UniqueArc`] instance.
- pub fn try_new(value: T) -> Result<Self, AllocError> {
+ pub fn new(value: T, flags: Flags) -> Result<Self, AllocError> {
Ok(Self {
// INVARIANT: The newly-created object has a refcount of 1.
- inner: Arc::try_new(value)?,
+ inner: Arc::new(value, flags)?,
})
}
/// Tries to allocate a new [`UniqueArc`] instance whose contents are not initialised yet.
- pub fn try_new_uninit() -> Result<UniqueArc<MaybeUninit<T>>, AllocError> {
+ pub fn new_uninit(flags: Flags) -> Result<UniqueArc<MaybeUninit<T>>, AllocError> {
// INVARIANT: The refcount is initialised to a non-zero value.
- let inner = Box::try_init::<AllocError>(try_init!(ArcInner {
- // SAFETY: There are no safety requirements for this FFI call.
- refcount: Opaque::new(unsafe { bindings::REFCOUNT_INIT(1) }),
- data <- init::uninit::<T, AllocError>(),
- }? AllocError))?;
+ let inner = Box::try_init::<AllocError>(
+ try_init!(ArcInner {
+ // SAFETY: There are no safety requirements for this FFI call.
+ refcount: Opaque::new(unsafe { bindings::REFCOUNT_INIT(1) }),
+ data <- init::uninit::<T, AllocError>(),
+ }? AllocError),
+ flags,
+ )?;
Ok(UniqueArc {
// INVARIANT: The newly-created object has a refcount of 1.
// SAFETY: The pointer from the `Box` is valid.
diff --git a/rust/kernel/sync/condvar.rs b/rust/kernel/sync/condvar.rs
index 0c3671caff..2b306afbe5 100644
--- a/rust/kernel/sync/condvar.rs
+++ b/rust/kernel/sync/condvar.rs
@@ -7,7 +7,6 @@
use super::{lock::Backend, lock::Guard, LockClassKey};
use crate::{
- bindings,
init::PinInit,
pin_init,
str::CStr,
@@ -75,7 +74,7 @@ pub use new_condvar;
/// Box::pin_init(pin_init!(Example {
/// value <- new_mutex!(0),
/// value_changed <- new_condvar!(),
-/// }))
+/// }), GFP_KERNEL)
/// }
/// ```
///
diff --git a/rust/kernel/sync/lock.rs b/rust/kernel/sync/lock.rs
index 5b5c8efe42..f6c34ca4d8 100644
--- a/rust/kernel/sync/lock.rs
+++ b/rust/kernel/sync/lock.rs
@@ -6,7 +6,7 @@
//! spinlocks, raw spinlocks) to be provided with minimal effort.
use super::LockClassKey;
-use crate::{bindings, init::PinInit, pin_init, str::CStr, types::Opaque, types::ScopeGuard};
+use crate::{init::PinInit, pin_init, str::CStr, types::Opaque, types::ScopeGuard};
use core::{cell::UnsafeCell, marker::PhantomData, marker::PhantomPinned};
use macros::pin_data;
diff --git a/rust/kernel/sync/lock/mutex.rs b/rust/kernel/sync/lock/mutex.rs
index ef4c4634d2..30632070ee 100644
--- a/rust/kernel/sync/lock/mutex.rs
+++ b/rust/kernel/sync/lock/mutex.rs
@@ -4,8 +4,6 @@
//!
//! This module allows Rust code to use the kernel's `struct mutex`.
-use crate::bindings;
-
/// Creates a [`Mutex`] initialiser with the given name and a newly-created lock class.
///
/// It uses the name if one is given, otherwise it generates one based on the file name and line
@@ -60,7 +58,7 @@ pub use new_mutex;
/// }
///
/// // Allocate a boxed `Example`.
-/// let e = Box::pin_init(Example::new())?;
+/// let e = Box::pin_init(Example::new(), GFP_KERNEL)?;
/// assert_eq!(e.c, 10);
/// assert_eq!(e.d.lock().a, 20);
/// assert_eq!(e.d.lock().b, 30);
diff --git a/rust/kernel/sync/lock/spinlock.rs b/rust/kernel/sync/lock/spinlock.rs
index 0b22c63563..ea5c5bc1ce 100644
--- a/rust/kernel/sync/lock/spinlock.rs
+++ b/rust/kernel/sync/lock/spinlock.rs
@@ -4,8 +4,6 @@
//!
//! This module allows Rust code to use the kernel's `spinlock_t`.
-use crate::bindings;
-
/// Creates a [`SpinLock`] initialiser with the given name and a newly-created lock class.
///
/// It uses the name if one is given, otherwise it generates one based on the file name and line
@@ -58,7 +56,7 @@ pub use new_spinlock;
/// }
///
/// // Allocate a boxed `Example`.
-/// let e = Box::pin_init(Example::new())?;
+/// let e = Box::pin_init(Example::new(), GFP_KERNEL)?;
/// assert_eq!(e.c, 10);
/// assert_eq!(e.d.lock().a, 20);
/// assert_eq!(e.d.lock().b, 30);
diff --git a/rust/kernel/task.rs b/rust/kernel/task.rs
index ca6e7e31d7..55dff7e088 100644
--- a/rust/kernel/task.rs
+++ b/rust/kernel/task.rs
@@ -4,7 +4,7 @@
//!
//! C header: [`include/linux/sched.h`](srctree/include/linux/sched.h).
-use crate::{bindings, types::Opaque};
+use crate::types::Opaque;
use core::{
ffi::{c_int, c_long, c_uint},
marker::PhantomData,
diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
index 25a896eed4..e3bb5e89f8 100644
--- a/rust/kernel/time.rs
+++ b/rust/kernel/time.rs
@@ -4,6 +4,12 @@
//!
//! This module contains the kernel APIs related to time and timers that
//! have been ported or wrapped for usage by Rust code in the kernel.
+//!
+//! C header: [`include/linux/jiffies.h`](srctree/include/linux/jiffies.h).
+//! C header: [`include/linux/ktime.h`](srctree/include/linux/ktime.h).
+
+/// The number of nanoseconds per millisecond.
+pub const NSEC_PER_MSEC: i64 = bindings::NSEC_PER_MSEC as i64;
/// The time unit of Linux kernel. One jiffy equals (1/HZ) second.
pub type Jiffies = core::ffi::c_ulong;
@@ -18,3 +24,60 @@ pub fn msecs_to_jiffies(msecs: Msecs) -> Jiffies {
// matter what the argument is.
unsafe { bindings::__msecs_to_jiffies(msecs) }
}
+
+/// A Rust wrapper around a `ktime_t`.
+#[repr(transparent)]
+#[derive(Copy, Clone)]
+pub struct Ktime {
+ inner: bindings::ktime_t,
+}
+
+impl Ktime {
+ /// Create a `Ktime` from a raw `ktime_t`.
+ #[inline]
+ pub fn from_raw(inner: bindings::ktime_t) -> Self {
+ Self { inner }
+ }
+
+ /// Get the current time using `CLOCK_MONOTONIC`.
+ #[inline]
+ pub fn ktime_get() -> Self {
+ // SAFETY: It is always safe to call `ktime_get` outside of NMI context.
+ Self::from_raw(unsafe { bindings::ktime_get() })
+ }
+
+ /// Divide the number of nanoseconds by a compile-time constant.
+ #[inline]
+ fn divns_constant<const DIV: i64>(self) -> i64 {
+ self.to_ns() / DIV
+ }
+
+ /// Returns the number of nanoseconds.
+ #[inline]
+ pub fn to_ns(self) -> i64 {
+ self.inner
+ }
+
+ /// Returns the number of milliseconds.
+ #[inline]
+ pub fn to_ms(self) -> i64 {
+ self.divns_constant::<NSEC_PER_MSEC>()
+ }
+}
+
+/// Returns the number of milliseconds between two ktimes.
+#[inline]
+pub fn ktime_ms_delta(later: Ktime, earlier: Ktime) -> i64 {
+ (later - earlier).to_ms()
+}
+
+impl core::ops::Sub for Ktime {
+ type Output = Ktime;
+
+ #[inline]
+ fn sub(self, other: Ktime) -> Ktime {
+ Self {
+ inner: self.inner - other.inner,
+ }
+ }
+}
diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
index aa77bad9bc..2e7c900862 100644
--- a/rust/kernel/types.rs
+++ b/rust/kernel/types.rs
@@ -157,11 +157,11 @@ impl ForeignOwnable for () {
/// let mut vec =
/// ScopeGuard::new_with_data(Vec::new(), |v| pr_info!("vec had {} elements\n", v.len()));
///
-/// vec.try_push(10u8)?;
+/// vec.push(10u8, GFP_KERNEL)?;
/// if arg {
/// return Ok(());
/// }
-/// vec.try_push(20u8)?;
+/// vec.push(20u8, GFP_KERNEL)?;
/// Ok(())
/// }
///
@@ -270,7 +270,7 @@ impl<T> Opaque<T> {
}
/// Returns a raw pointer to the opaque data.
- pub fn get(&self) -> *mut T {
+ pub const fn get(&self) -> *mut T {
UnsafeCell::get(&self.value).cast::<T>()
}
diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
index 480cb292e7..1cec63a2ae 100644
--- a/rust/kernel/workqueue.rs
+++ b/rust/kernel/workqueue.rs
@@ -33,7 +33,6 @@
//! we do not need to specify ids for the fields.
//!
//! ```
-//! use kernel::prelude::*;
//! use kernel::sync::Arc;
//! use kernel::workqueue::{self, impl_has_work, new_work, Work, WorkItem};
//!
@@ -53,7 +52,7 @@
//! Arc::pin_init(pin_init!(MyStruct {
//! value,
//! work <- new_work!("MyStruct::work"),
-//! }))
+//! }), GFP_KERNEL)
//! }
//! }
//!
@@ -75,7 +74,6 @@
//! The following example shows how multiple `work_struct` fields can be used:
//!
//! ```
-//! use kernel::prelude::*;
//! use kernel::sync::Arc;
//! use kernel::workqueue::{self, impl_has_work, new_work, Work, WorkItem};
//!
@@ -101,7 +99,7 @@
//! value_2,
//! work_1 <- new_work!("MyStruct::work_1"),
//! work_2 <- new_work!("MyStruct::work_2"),
-//! }))
+//! }), GFP_KERNEL)
//! }
//! }
//!
@@ -132,11 +130,9 @@
//!
//! C header: [`include/linux/workqueue.h`](srctree/include/linux/workqueue.h)
-use crate::{bindings, prelude::*, sync::Arc, sync::LockClassKey, types::Opaque};
-use alloc::alloc::AllocError;
-use alloc::boxed::Box;
+use crate::alloc::{AllocError, Flags};
+use crate::{prelude::*, sync::Arc, sync::LockClassKey, types::Opaque};
use core::marker::PhantomData;
-use core::pin::Pin;
/// Creates a [`Work`] initialiser with the given name and a newly-created lock class.
#[macro_export]
@@ -210,13 +206,17 @@ impl Queue {
/// Tries to spawn the given function or closure as a work item.
///
/// This method can fail because it allocates memory to store the work item.
- pub fn try_spawn<T: 'static + Send + FnOnce()>(&self, func: T) -> Result<(), AllocError> {
+ pub fn try_spawn<T: 'static + Send + FnOnce()>(
+ &self,
+ flags: Flags,
+ func: T,
+ ) -> Result<(), AllocError> {
let init = pin_init!(ClosureWork {
work <- new_work!("Queue::try_spawn"),
func: Some(func),
});
- self.enqueue(Box::pin_init(init).map_err(|_| AllocError)?);
+ self.enqueue(Box::pin_init(init, flags).map_err(|_| AllocError)?);
Ok(())
}
}
@@ -346,8 +346,10 @@ pub trait WorkItem<const ID: u64 = 0> {
/// This is a helper type used to associate a `work_struct` with the [`WorkItem`] that uses it.
///
/// [`run`]: WorkItemPointer::run
+#[pin_data]
#[repr(transparent)]
pub struct Work<T: ?Sized, const ID: u64 = 0> {
+ #[pin]
work: Opaque<bindings::work_struct>,
_inner: PhantomData<T>,
}
@@ -369,21 +371,22 @@ impl<T: ?Sized, const ID: u64> Work<T, ID> {
where
T: WorkItem<ID>,
{
- // SAFETY: The `WorkItemPointer` implementation promises that `run` can be used as the work
- // item function.
- unsafe {
- kernel::init::pin_init_from_closure(move |slot| {
- let slot = Self::raw_get(slot);
- bindings::init_work_with_key(
- slot,
- Some(T::Pointer::run),
- false,
- name.as_char_ptr(),
- key.as_ptr(),
- );
- Ok(())
- })
- }
+ pin_init!(Self {
+ work <- Opaque::ffi_init(|slot| {
+ // SAFETY: The `WorkItemPointer` implementation promises that `run` can be used as
+ // the work item function.
+ unsafe {
+ bindings::init_work_with_key(
+ slot,
+ Some(T::Pointer::run),
+ false,
+ name.as_char_ptr(),
+ key.as_ptr(),
+ )
+ }
+ }),
+ _inner: PhantomData,
+ })
}
/// Get a pointer to the inner `work_struct`.
@@ -408,7 +411,6 @@ impl<T: ?Sized, const ID: u64> Work<T, ID> {
/// like this:
///
/// ```no_run
-/// use kernel::prelude::*;
/// use kernel::workqueue::{impl_has_work, Work};
///
/// struct MyWorkItem {
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 17:47:40 +0000