Re: [patch 0/2] PCI/MSI: Avoid PCI level masking during normal operation if requested

[Marc Zyngier <maz@kernel.org>]

On Wed, 03 Sep 2025 15:04:44 +0100,
Thomas Gleixner <tglx@linutronix.de> wrote:
> 
> This is a follow up to Marc's attempt on this:
> 
>      https://lore.kernel.org/lkml/20250517103011.2573288-1-maz@kernel.org
> 
> Now that the PCI/MSI side has irq_startup/shutdown() callbacks, which do
> the [un]masking at the PCI level, let the MSI parent domains which insist
> on being in charge of masking do so for normal operations.
> 
> That avoids going out to the PCI endpoint in the case that an interrupt has
> to be masked on arrival of an interrupt in software (lazy) disabled state.
> 
> That's achieved by overwriting the irq_[un]mask() callbacks in the irq/MSI
> library.
> 
> As a consequence the conditional mask/unmask logic in the regular
> irq_[un]mask() callbacks of the PCI/MSI domain is not longer required.

I took this for a quick ride on some of my least favourite machines,
and nothing caught fire.

FWIW:

Acked-by: Marc Zyngier <maz@kernel.org>
Tested-by: Marc Zyngier <maz@kernel.org>

Thanks for having re-spun it,

	M.

-- 
Without deviation from the norm, progress is not possible.