This patch series adds the dma::Device trait to be implemented by bus devices on DMA capable busses. The dma::Device trait implements methods to set the DMA mask for for such devices. The first two bus devices implementing the trait are PCI and platform. Unfortunately, the DMA mask setters have to be unsafe for now, since, with reasonable effort, we can't prevent drivers from data races writing and reading the DMA mask fields concurrently (see also [1]). Link: https://lore.kernel.org/lkml/DB6YTN5P23X3.2S0NH4YECP1CP@xxxxxxxxxx/ [1] Link: https://git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git/log/?h=rust/dma-mask Changes in v2: - replace dma_bit_mask() with a new type DmaMask - mention that DmaMask is the Rust equivalent of the C macro DMA_BIT_MASK() - make DmaMask::new() fallible - inline DmaMask methods Danilo Krummrich (5): rust: dma: implement `dma::Device` trait rust: dma: add DMA addressing capabilities rust: pci: implement the `dma::Device` trait rust: platform: implement the `dma::Device` trait rust: samples: dma: set DMA mask rust/helpers/dma.c | 5 ++ rust/kernel/dma.rs | 125 ++++++++++++++++++++++++++++++++++++--- rust/kernel/pci.rs | 2 + rust/kernel/platform.rs | 2 + samples/rust/rust_dma.rs | 14 ++++- 5 files changed, 140 insertions(+), 8 deletions(-) base-commit: d49ac7744f578bcc8708a845cce24d3b91f86260 -- 2.50.0
