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

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Message-ID: <4998cb40-8e9b-f08d-c093-304c0e6355b3@marcan.st>
Date:   Thu, 21 Jan 2021 22:01:58 +0900
From:   Hector Martin 'marcan' <marcan@...can.st>
To:     Arnd Bergmann <arnd@...nel.org>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
        Stan Skowronek <stan@...ellium.com>
Subject: Re: [RFC PATCH 7/7] irqchip/apple-aic: add SMP support to the Apple
 AIC driver.

On 21/01/2021 22.00, Arnd Bergmann wrote:
> Ok, makes sense. Does fast-ipi mean you cannot use the other mode at
> all, or is it just faster as implied by the name? If so, how much faster?

The other mode still works, as the AIC IPI registers are still there on 
M1 and work properly. I don't have performance numbers though.

-- 
Hector Martin "marcan" (marcan@...can.st)
Public Key: https://mrcn.st/pub