linux-kernel - Re: SMP enablement on Cortex-R52 (using PSCI ?)

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Message-ID: <f4227609-ec24-58f8-e4d3-073434fd7ab3@arm.com>
Date:   Tue, 18 Apr 2023 13:14:05 +0100
From:   Vladimir Murzin <vladimir.murzin@....com>
To:     Ayan Kumar Halder <ayankuma@....com>, mark.rutland@....com,
        lpieralisi@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: SMP enablement on Cortex-R52 (using PSCI ?)

Hi,

On 4/14/23 12:24, Ayan Kumar Halder wrote:
> Hi PSCI developers,
> 
> We have a SoC where there are 4 Cortex-R52 which is distributed in two clusters. So we have 2 Cortex-R52 in one cluster and 2 Cortex-R52 in another cluster.
> 
> We wish to enable SMP on the 2 R52 within a cluster with Xen hypervisor (EL2 software) running on them.
> 
> We are trying to explore if we can use PSCI for booting the secondary cores.
> 

snip

> 
> I wish to know how do we wake up the secondary core if PSCI is not supported.
> 

It looks to me you need to provide/use platform defined method. I see that
Xen provides struct platform_desc with smp_init and cpu_up callbacks...

Cheers
Vladimir

> Kind regards,
> Ayan
> 
> 
>