linux-kernel - Re: [PATCH v2 0/1] arm: topology: parse the topology from the dt

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Message-ID: <87wnt2lglo.mognet@arm.com>
Date:   Fri, 16 Apr 2021 10:32:35 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Ruifeng Zhang <ruifeng.zhang0110@...il.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>
Cc:     linux@...linux.org.uk, sudeep.holla@....com,
        Greg KH <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>, a.p.zijlstra@...llo.nl,
        mingo@...nel.org, ruifeng.zhang1@...soc.com, nianfu.bai@...soc.com,
        linux-arm-kernel@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/1] arm: topology: parse the topology from the dt

On 16/04/21 15:47, Ruifeng Zhang wrote:
> For more requirements, if all cores in one physical cluster, the
> {aff2} of all cores are the same value.
> i.e. the sc9863a,
> core0: 0000000081000000
> core1: 0000000081000100
> core2: 0000000081000200
> core3: 0000000081000300
> core4: 0000000081000400
> core5: 0000000081000500
> core6: 0000000081000600
> core7: 0000000081000700
>
> According to MPIDR all cores will parse to the one cluster, but it's
> the big.LITTLE system, it's need two logic cluster for schedule or
> cpufreq.
> So I think it's better to add the logic of parse topology from DT.

Ah, so it's a slightly different issue, but still one that requires a
different means of specifying topology.