linux-kernel - Re: [PATCH v13 0/7] rust: add dma coherent allocator abstraction

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Message-ID: <Z8rUqc1N2K37Xkzf@cassiopeiae>
Date: Fri, 7 Mar 2025 12:12:41 +0100
From: Danilo Krummrich <dakr@...nel.org>
To: Abdiel Janulgue <abdiel.janulgue@...il.com>
Cc: rust-for-linux@...r.kernel.org, daniel.almeida@...labora.com,
	robin.murphy@....com, 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 v13 0/7] rust: add dma coherent allocator abstraction

On Fri, Mar 07, 2025 at 01:06:17PM +0200, Abdiel Janulgue wrote:
> This series adds the rust bindings for the dma coherent allocator which
> is needed for nova-core[0]. For v13, the biggest change is to move out
> the as_slice and write helpers for later discussion. The object is also
> now wrapped in Devres to explicitly tie it to the lifetime of the
> device[1].

Just to clarify:

What is meant here is that a CoherentAllocation can't out-live driver unbind.
This is not equivalent to the lifetime of the corresponding struct device.