Re: [RFC PATCH 1/2] rust: add initial scatterlist bindings

[Danilo Krummrich <dakr@kernel.org>]

On Mon, May 12, 2025 at 05:01:45PM -0300, Daniel Almeida wrote:
> Hi Jason,
> 
> >> +
> >> +    /// Map this scatter-gather table describing a buffer for DMA.
> >> +    pub fn dma_map(&mut self, dir: DmaDataDirection) -> Result {
> >> +        // SAFETY: Invariants on `Device` and `SGTable` ensures that the `self.dev` and `self.sg`
> >> +        // pointers are valid.
> >> +        let ret = unsafe {
> >> +            bindings::dma_map_sgtable(
> >> +                self.dev.as_raw(),
> >> +                self.sg.as_raw(),
> > 
> > Can't call this function on an unbound driver, didn't someone add
> > special types for this recently?
> 
> JFYI: I think that the “Bound” state is still WIP and not upstream yet.

It's in driver-core-next and queued up for v6.16.

There's also a signed tag [1] that can be merged into other trees, such that
this can be used right away.

- Danilo

[1] https://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core.git/tag/?h=topic/device-context-2025-04-17