Re: [PATCH v2 0/5] Rework PCI IRQ vector code

[John Hubbard <jhubbard@nvidia.com>]

On 8/11/26 4:39 PM, Danilo Krummrich wrote:
> This series reworks the Rust PCI interrupt vector abstractions, motivated by
> review feedback on the nova-core interrupt support series [1].
> 
> Convert IrqVectorRegistration to a lifetime-managed owning type, replacing the
> devres-based approach. Since vector() borrows the registration, the returned
> IrqVector inherits that lifetime, preventing the allocation from being dropped
> while any handler is live.
> 
> IrqVector embeds a resolved IrqRequest, making the conversion infallible. The
> request_irq()/request_threaded_irq() wrappers on Device are removed since their
> &self receiver could refer to an unrelated device.
> 
> Add pci_irq_type() as a C function in include/linux/pci.h, replacing open-coded
> checks across drivers [2], and wrap it for Rust.
> 
> [1] https://lore.kernel.org/all/20260808031120.363869-1-jhubbard@nvidia.com/
> [2] https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196
> 
> Changes in v2:
>   - Drop the IrqRequestAnchor approach and keep IrqVector as a new type over
>     IrqRequest.
> 

I've integrated this version into my work-in-progress v2 patchset for interrupt
support for nova[1], and it still passes tests on some real GPU hardware.

For example:

$ dmesg -t | grep -B1 'interrupt self-test'
nova-core 0000:c1:00.0: NVIDIA (Chipset: TU117, Architecture: Turing, Revision: a.1)
nova-core 0000:c1:00.0: interrupt self-test: starting on vector 129, subtree 2, with Msi
nova-core 0000:c1:00.0: interrupt self-test: passed, subtree 2, 2 deliveries
--
nova-core 0000:c2:00.0: NVIDIA (Chipset: GB202, Architecture: BlackwellGB20x, Revision: a.1)
nova-core 0000:c2:00.0: interrupt self-test: starting on vector 129, subtree 2, with Msi
nova-core 0000:c2:00.0: interrupt self-test: passed, subtree 2, 2 deliveries
--
nova-core 0000:01:00.0: NVIDIA (Chipset: GA104, Architecture: Ampere, Revision: a.1)
nova-core 0000:01:00.0: interrupt self-test: starting on vector 129, subtree 2, with Msi
nova-core 0000:01:00.0: interrupt self-test: passed, subtree 2, 2 deliveries

So for the series, please feel free to add:

Tested-by: John Hubbard <jhubbard@nvidia.com>


[1] https://github.com/johnhubbard/linux/tree/nova-core-gin-interrupt-tree-v2

thanks,
-- 
John Hubbard