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Date:   Tue, 18 Apr 2023 13:14:05 +0100
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Subject: Re: SMP enablement on Cortex-R52 (using PSCI ?)
To:     Ayan Kumar Halder <ayankuma@amd.com>, mark.rutland@arm.com,
        lpieralisi@kernel.org
Cc:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Stefano Stabellini <sstabellini@kernel.org>
References: <1cb7d428-c047-1485-e39d-465806f6ef0b@amd.com>
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From:   Vladimir Murzin <vladimir.murzin@arm.com>
In-Reply-To: <1cb7d428-c047-1485-e39d-465806f6ef0b@amd.com>
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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
> 
> 
>