Commit 931d9251 authored by Danilo Krummrich's avatar Danilo Krummrich
Browse files

rust: samples: dma: set DMA mask 



Set a DMA mask for the `pci::Device` in the Rust DMA sample driver.

Reviewed-by: default avatarAbdiel Janulgue <abdiel.janulgue@gmail.com>
Reviewed-by: default avatarDaniel Almeida <daniel.almeida@collabora.com>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250716150354.51081-6-dakr@kernel.org


Signed-off-by: default avatarDanilo Krummrich <dakr@kernel.org>
parent 256de48f

samples/rust/rust_dma.rs

+13 −1
Original line number Diff line number Diff line
@@ -4,7 +4,14 @@ 
//!

//! To make this driver probe, QEMU must be run with `-device pci-testdev`.



use kernel::{bindings, device::Core, dma::CoherentAllocation, pci, prelude::*, types::ARef};

use kernel::{

    bindings,

    device::Core,

    dma::{CoherentAllocation, Device, DmaMask},

    pci,

    prelude::*,

    types::ARef,

};



struct DmaSampleDriver {

    pdev: ARef<pci::Device>,
@@ -51,6 +58,11 @@ impl pci::Driver for DmaSampleDriver { 
    fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self>>> {

        dev_info!(pdev.as_ref(), "Probe DMA test driver.\n");



        let mask = DmaMask::new::<64>();



        // SAFETY: There are no concurrent calls to DMA allocation and mapping primitives.

        unsafe { pdev.dma_set_mask_and_coherent(mask)? };



        let ca: CoherentAllocation<MyStruct> =

            CoherentAllocation::alloc_coherent(pdev.as_ref(), TEST_VALUES.len(), GFP_KERNEL)?;