Struct dma_buf::MappedDmaBuf

source ·

pub struct MappedDmaBuf {
    pub(crate) buf: DmaBuf,
    pub(crate) len: usize,
    pub(crate) mmap: *mut u8,
}

Expand description

A DmaBuf mapped in memory

Fields§

§buf: DmaBuf§len: usize§mmap: *mut u8

Implementations§

source §

pub fn read<A, F, R>(&self, f: F, arg: Option<A>) -> Result<R, BufferError>
where F: Fn(&[u8], Option<A>) -> Result<R, Box<dyn Error>>,

Calls a closure to read the buffer content

DMA-Buf requires the user-space to call the DMA_BUF_IOCTL_SYNC ioctl before and after any CPU access to a buffer in order to maintain the cache coherency. The closure will be run with those primitives called for a read access from the CPU.

The result of the closure will be returned.

§Errors

Will return [Error] if the underlying ioctl or the closure fails

source

pub fn readwrite<A, F, R>( &mut self, f: F, arg: Option<A>, ) -> Result<R, BufferError>
where F: Fn(&mut [u8], Option<A>) -> Result<R, Box<dyn Error>>,

Calls a closure to read from and write to the buffer content

DMA-Buf requires the user-space to call the DMA_BUF_IOCTL_SYNC ioctl before and after any CPU access to a buffer in order to maintain the cache coherency. The closure will be run with those primitives called for a read and write access from the CPU.

The result of the closure will be returned on success. On failure, the closure must return Error::Closure

§Errors

Will return [Error] if the underlying ioctl or the closure fails

source

pub fn write<A, F>(&mut self, f: F, arg: Option<A>) -> Result<(), BufferError>
where F: Fn(&mut [u8], Option<A>) -> Result<(), Box<dyn Error>>,

Calls a closure to read from and write to the buffer content

DMA-Buf requires the user-space to call the DMA_BUF_IOCTL_SYNC ioctl before and after any CPU access to a buffer in order to maintain the cache coherency. The closure will be run with those primitives called for a read and write access from the CPU.

The closure must return () on success. On failure, the closure must return Error::Closure.