linux-kernel - Re: [RFC PATCH 7/7] irqchip/apple-aic: add SMP support to the Apple AIC driver.

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Message-Id: <34C3EC52-15A0-4DFF-8953-2A12E88ADDD4@caramail.com>
Date:   Thu, 21 Jan 2021 16:18:53 +0100
From:   Mohamed Mediouni <mohamed.mediouni@...amail.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Marc Zyngier <maz@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Hector Martin <marcan@...can.st>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Will Deacon <will@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Stan Skowronek <stan@...ellium.com>
Subject: Re: [RFC PATCH 7/7] irqchip/apple-aic: add SMP support to the Apple
 AIC driver.



> On 21 Jan 2021, at 16:09, Arnd Bergmann <arnd@...nel.org> wrote:
> 
> On Thu, Jan 21, 2021 at 3:10 PM Marc Zyngier <maz@...nel.org> wrote:
>> On 2021-01-21 13:34, Mohamed Mediouni wrote:
>>>> On 21 Jan 2021, at 14:22, Marc Zyngier <maz@...nel.org> wrote:
>>> Because UART access adapters for the new M1 Macs aren’t plentiful
>>> at all, I actually use this for development, with iPhones which have
>>> much more easy to buy Lightning-to-UART adapters.
>>> 
>>> (That’s why the old implementation is there too)
>>> 
>>> Might be worth splitting the new one to a new commit though...
>> 
>> This series is supposed to cover M1 only, and adding extra support
>> as part of it is only likely to make the code harder to review.
>> 
>> I'd rather you focus on a single IPI interface (fast or slow,
>> I don't really care). Extra features can come in later.
> 
> Agreed. The slow interface is probably easier to start with,
> because it avoids hooking into the FIQ, so the FIQ can be
> completely decoupled from AIC and just used for the timer.
> 
> Maybe there is even a way to use more than one hardware IPI in
> the AIC?
> 
>       Arnd
Hello,

Decided to only have only the slow interface in the second patch series.

Thank you,