linux-kernel - Re: [PATCH v11 2/3] rust: add dma coherent allocator abstraction.

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Message-ID: <2b019479-2d32-433f-af78-c3378dee4e2b@gmail.com>
Date: Tue, 18 Feb 2025 11:58:33 +0200
From: Abdiel Janulgue <abdiel.janulgue@...il.com>
To: Robin Murphy <robin.murphy@....com>,
 Daniel Almeida <daniel.almeida@...labora.com>
Cc: rust-for-linux@...r.kernel.org, dakr@...nel.org, aliceryhl@...gle.com,
 Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>,
 Benno Lossin <benno.lossin@...ton.me>,
 Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>,
 Valentin Obst <kernel@...entinobst.de>,
 open list <linux-kernel@...r.kernel.org>, Christoph Hellwig <hch@....de>,
 Marek Szyprowski <m.szyprowski@...sung.com>, airlied@...hat.com,
 "open list:DMA MAPPING HELPERS" <iommu@...ts.linux.dev>
Subject: Re: [PATCH v11 2/3] rust: add dma coherent allocator abstraction.

Hi Robin,

On 17/02/2025 15:52, Robin Murphy wrote:
> FWIW we've been wanting to steer away from relying on the default mask 
> in new code, so it would be quite neat to actually enforce that 
> allocations fail if dma_coherent_mask hasn't been explicitly set 
> (assuming it's sufficiently cheap to keep a flag in the Device handle or 
> something like that - it's not the end of the world if it isn't practical).

I just had a quick look on how to possible approach this and indeed 
would refactor the Device binding a bit. If it is okay with you this 
could go in a follow-up patch? I was hoping to upstream the initial 
support first - at least with the dma_set_mask/dma_set_coherent_mask put 
in place already.

Thanks!
/Abdiel