linux-kernel - Re: [PATCH 0/5] RISC-V: Add cpu-map topology information nodes

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Date:   Tue, 5 Jul 2022 21:19:31 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Conor Dooley <mail@...chuod.ie>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Daire McNamara <daire.mcnamara@...rochip.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Niklas Cassel <niklas.cassel@....com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Zong Li <zong.li@...ive.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Jonas Hahnfeld <hahnjo@...njo.de>, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Brice Goglin <Brice.Goglin@...ia.fr>
Subject: Re: [PATCH 0/5] RISC-V: Add cpu-map topology information nodes

On Tue, Jul 05, 2022 at 08:04:31PM +0100, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
> 
> It was reported to me that the Hive Unmatched incorrectly reports
> its topology to hwloc, but the StarFive VisionFive did in [0] &
> a subsequent off-list email from Brice (the hwloc maintainer).
> This turned out not to be entirely true, the /downstream/ version
> of the VisionFive does work correctly but not upstream, as the
> downstream devicetree has a cpu-map node that was added recently.
> 
> This series adds a cpu-map node to all upstream devicetrees, which
> I have tested on mpfs & fu540. The first patch is lifted directly
> from the downstream StarFive devicetree.
> 

Reviewed-by: Sudeep Holla <sudeep.holla@....com>

I would recommend to have sane defaults in core risc-v code in case of
absence of /cpu-map node as it is optional. The reason I mentioned is that
Conor mentioned how the default values in absence of the node looked quite
wrong. I don't know if it is possible on RISC-V but on ARM64 we do have
default values if arch_topology fails to set based on DT/ACPI.

-- 
Regards,
Sudeep