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Date: Sun, 09 Aug 2026 15:27:25 +0200
Message-Id: <DKKG4YVPV3HK.8S3VXDIH14Q9@kernel.org>
From: "Danilo Krummrich" <dakr@kernel.org>
Subject: Re: [PATCH 02/17] rust: pci: expose the whole interrupt vector
 allocation
Cc: "Joel Fernandes" <joel@joelfernandes.org>, "Alexandre Courbot"
 <acourbot@nvidia.com>, "Timur Tabi" <ttabi@nvidia.com>, "Alistair Popple"
 <apopple@nvidia.com>, "Eliot Courtney" <ecourtney@nvidia.com>, "Shashank
 Sharma" <shashanks@nvidia.com>, "Zhi Wang" <zhiw@nvidia.com>, "David
 Airlie" <airlied@gmail.com>, "Simona Vetter" <simona@ffwll.ch>, "Bjorn
 Helgaas" <bhelgaas@google.com>, "Miguel Ojeda" <ojeda@kernel.org>, "Alex
 Gaynor" <alex.gaynor@gmail.com>, "Boqun Feng" <boqun.feng@gmail.com>, "Gary
 Guo" <gary@garyguo.net>, =?utf-8?q?Bj=C3=B6rn_Roy_Baron?=
 <bjorn3_gh@protonmail.com>, "Benno Lossin" <lossin@kernel.org>, "Andreas
 Hindborg" <a.hindborg@kernel.org>, "Alice Ryhl" <aliceryhl@google.com>,
 "Trevor Gross" <tmgross@umich.edu>, <nova-gpu@lists.linux.dev>, "LKML"
 <linux-kernel@vger.kernel.org>
To: "John Hubbard" <jhubbard@nvidia.com>
References: <20260808031120.363869-1-jhubbard@nvidia.com>
 <20260808031120.363869-3-jhubbard@nvidia.com>
In-Reply-To: <20260808031120.363869-3-jhubbard@nvidia.com>

On Sat Aug 8, 2026 at 5:11 AM CEST, John Hubbard wrote:
> +/// An allocation of PCI interrupt vectors for a device.
> +///
> +/// [`Device::alloc_irq_vectors`] allocates the vectors and returns this=
 handle. The vectors are
> +/// numbered `0..count`, and [`Self::vector`] resolves one of those indi=
ces to the Linux IRQ
> +/// number that delivers it.
> +///
> +/// # Invariants
> +///
> +/// `dev` has an allocation of `count` interrupt vectors.
> +#[derive(Clone, Copy)]
> +pub struct IrqAllocation<'a> {
> +    dev: &'a Device<Bound>,
> +    count: NonZero<u32>,
>  }

[...]

> @@ -128,13 +156,13 @@ impl IrqVectorRegistration {
>      /// Allocate and register IRQ vectors for the given PCI device.
>      ///
>      /// Allocates IRQ vectors and registers them with devres for automat=
ic cleanup.
> -    /// Returns a range of valid IRQ vectors.
> +    /// Returns a handle to the allocated IRQ vectors.
>      fn register<'a>(
>          dev: &'a Device<Bound>,
>          min_vecs: u32,
>          max_vecs: u32,
>          irq_types: IrqTypes,
> -    ) -> Result<RangeInclusive<IrqVector<'a>>> {
> +    ) -> Result<IrqAllocation<'a>> {

Please see the second part in [1].

[1] https://lore.kernel.org/all/DKKG2QM3YJYB.Z2H2B2UXJ75N@kernel.org/