linux-kernel - Re: [PATCH v3 2/4] cacheinfo: Check cache properties are present in DT

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Date:   Thu, 13 Apr 2023 11:06:08 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Pierre Gondois <pierre.gondois@....com>
CC:     <linux-kernel@...r.kernel.org>, Radu Rendec <rrendec@...hat.com>,
        Alexandre Ghiti <alexghiti@...osinc.com>,
        Will Deacon <will@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Palmer Dabbelt <palmer@...osinc.com>,
        Gavin Shan <gshan@...hat.com>
Subject: Re: [PATCH v3 2/4] cacheinfo: Check cache properties are present in
 DT

On Thu, Apr 13, 2023 at 11:14:32AM +0200, Pierre Gondois wrote:
> If a Device Tree (DT) is used, the presence of cache properties is
> assumed. Not finding any is not considered. For arm64 platforms,
> cache information can be fetched from the clidr_el1 register.
> Checking whether cache information is available in the DT
> allows to switch to using clidr_el1.
> 
> init_of_cache_level()
> \-of_count_cache_leaves()
> will assume there a 2 cache leaves (L1 data/instruction caches), which
> can be different from clidr_el1 information.
> 
> cache_setup_of_node() tries to read cache properties in the DT.
> If there are none, this is considered a success. Knowing no
> information was available would allow to switch to using clidr_el1.
> 
> Fixes: de0df442ee49 ("cacheinfo: Check 'cache-unified' property to count cache leaves")
> Reported-by: Alexandre Ghiti <alexghiti@...osinc.com>
> Link: https://lore.kernel.org/all/20230404-hatred-swimmer-6fecdf33b57a@spud/
> Signed-off-by: Pierre Gondois <pierre.gondois@....com>


Since there's no longer an error printed
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

Thanks for the update Pierre,
Conor.

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