Re: [PATCH v2 09/10] irqchip: ti-sci-inta: Add support for Interrupt Aggregator driver

Santosh Shilimkar
2018-10-31T18:38:44Z

On 10/31/2018 11:21 AM, Marc Zyngier wrote:
> Hi Grygorii,
>

[...]

>
> Well, I'm convinced that we do not want a networking driver to be tied
> to an interrupt architecture, and that the two should be completely
> independent. But that's my own opinion. I can only see two solutions
> moving forward:
>
> 1) You make the IA a real interrupt controller that exposes real
> interrupts (one per event), and write your networking driver
> independently of the underlying interrupt architecture.
>
> 2) you make the IA an integral part of your network driver, not exposing
> anything outside of it, and limiting the interactions with the IR
> *through the standard IRQ API*. You duplicate this knowledge throughout
> the other client drivers.
>
> I believe that (2) would be a massive design mistake as it locks the
> driver to a single of the HW (and potentially a single revision of the
> firmware) while (1) gives you the required level of flexibility by
> hiding the whole event "concept" at a single location.
>
> Yes, (1) makes you rewrite your existing, out of tree drivers. Oh well...
>
My preference is also not tie the network driver with IA. BTW, this is
very standard functionality with other network drivers too. And this
is handled using MSI-X.

So strong NO for 1) from me as well.

regards,
Santosh