Struct DmaStream Copy item path

impl DmaStream

pub fn map( segment: USegment, direction: DmaDirection, is_cache_coherent: bool, ) -> Result<Self, DmaError>

Establishes DMA stream mapping for a given USegment.

The method fails if the segment already belongs to a DMA mapping.

pub fn segment(&self) -> &USegment

Gets the underlying USegment.

Usually, the CPU side should not access the memory after the DMA mapping is established because there is a chance that the device is updating the memory. Do this at your own risk.

pub fn direction(&self) -> DmaDirection

Returns the DMA direction.

pub fn sync(&self, _byte_range: Range<usize>) -> Result<(), Error>

Synchronizes the streaming DMA mapping with the device.

This method should be called under one of the two conditions:

The data of the stream DMA mapping has been updated by the device side. The CPU side needs to call the sync method before reading data (e.g., using read_bytes).
The data of the stream DMA mapping has been updated by the CPU side (e.g., using write_bytes). Before the CPU side notifies the device side to read, it must call the sync method first.

Trait Implementations§

impl Debug for DmaStream

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

impl Drop for DmaStream

fn drop(&mut self)

Executes the destructor for this type. Read more

impl HasDaddr for DmaStream

fn daddr(&self) -> Daddr

Returns the base address of the mapping in the device address space.

impl HasPaddr for DmaStream

fn paddr(&self) -> Paddr

Returns the start physical address of the memory object.

impl HasSize for DmaStream

fn size(&self) -> usize

Returns the size of the memory object in bytes.

impl HasVmReaderWriter for DmaStream

type Types = VmReaderWriterResult

A marker type that denotes the return types of Self::reader and Self::writer. Read more

fn reader(&self) -> Result<VmReader<'_, Infallible>, Error>

Returns a reader to read data from it.

fn writer(&self) -> Result<VmWriter<'_, Infallible>, Error>

Returns a writer to write data to it.

Auto Trait Implementations§

impl !UnwindSafe for DmaStream

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T
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where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.

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where Self: Display,

Causes self to use its Display implementation when Debug-formatted.

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where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.

fn fmt_lower_hex(self) -> FmtLowerHex<Self>
where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.

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where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.

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where Self: Pointer,

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where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.

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where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.

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Formats each item in a sequence. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T> HasPaddrRange for T
where T: HasPaddr + HasSize,

fn end_paddr(&self) -> usize

Returns the end physical address of the memory object.

fn paddr_range(&self) -> Range<usize>

Returns the physical address range of the memory object.

impl<T, U> Into for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of [From]<T> for U chooses to do.

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Pipes by value. This is generally the method you want to use. Read more

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where R: 'a,

Borrows self and passes that borrow into the pipe function. Read more

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Mutably borrows self and passes that borrow into the pipe function. Read more

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Borrows self, then passes self.borrow() into the pipe function. Read more

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Borrows self, then passes self.as_ref() into the pipe function.

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Borrows self, then passes self.deref() into the pipe function.

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type Metadata = ()

The metadata type for pointers and references to this type.

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where Self: Borrow, B: ?Sized,

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fn tap_borrow_mut(self, func: impl FnOnce(&mut B)) -> Self
where Self: BorrowMut, B: ?Sized,

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Calls .tap() only in debug builds, and is erased in release builds.

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Calls .tap_deref() only in debug builds, and is erased in release builds.

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Calls .tap_deref_mut() only in debug builds, and is erased in release builds.

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Attempts to convert self into T using TryInto<T>. Read more

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Performs the conversion.

impl<S> VmIo for S
where S: HasVmReaderWriter + Send + Sync,

fn read(&self, offset: usize, writer: &mut VmWriter<'_>) -> Result<(), Error>

Reads requested data at a specified offset into a given VmWriter. Read more

fn read_bytes(&self, offset: usize, buf: &mut [u8]) -> Result<(), Error>

Reads a specified number of bytes at a specified offset into a given buffer. Read more

fn read_val<T>(&self, offset: usize) -> Result<T, Error>
where T: Pod,

Reads a value of a specified type at a specified offset.

fn write(&self, offset: usize, reader: &mut VmReader<'_>) -> Result<(), Error>

Writes all data from a given VmReader at a specified offset. Read more

fn write_bytes(&self, offset: usize, buf: &[u8]) -> Result<(), Error>

Writes a specified number of bytes from a given buffer at a specified offset. Read more

fn write_val<T>(&self, offset: usize, new_val: &T) -> Result<(), Error>
where T: Pod,

Writes a value of a specified type at a specified offset.

fn read_slice<T: Pod>(&self, offset: usize, slice: &mut [T]) -> Result<()>

Reads a slice of a specified type at a specified offset. Read more

fn write_slice<T: Pod>(&self, offset: usize, slice: &[T]) -> Result<()>

Writes a slice of a specified type at a specified offset. Read more

impl<S> VmIoFill for S
where S: HasVmReaderWriter,

fn fill_zeros(&self, offset: usize, len: usize) -> Result<(), (Error, usize)>

Writes len zeros at a specified offset. Read more

impl<S> VmIoOnce for S
where S: HasVmReaderWriter,

fn read_once<T>(&self, offset: usize) -> Result<T, Error>
where T: PodOnce,

Reads a value of the PodOnce type at the specified offset using one non-tearing memory load. Read more