linux-kernel - Re: [PATCH 02/33] drivers: base: cacheinfo: Add helper to find the cache size from cpu+level

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Message-ID: <9fde0d3c-52e7-4545-a273-4b37b865997c@arm.com>
Date: Wed, 27 Aug 2025 18:11:38 +0100
From: James Morse <james.morse@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
 devicetree@...r.kernel.org
Cc: shameerali.kolothum.thodi@...wei.com,
 D Scott Phillips OS <scott@...amperecomputing.com>,
 carl@...amperecomputing.com, lcherian@...vell.com,
 bobo.shaobowang@...wei.com, tan.shaopeng@...itsu.com,
 baolin.wang@...ux.alibaba.com, Jamie Iles <quic_jiles@...cinc.com>,
 Xin Hao <xhao@...ux.alibaba.com>, peternewman@...gle.com,
 dfustini@...libre.com, amitsinght@...vell.com,
 David Hildenbrand <david@...hat.com>, Rex Nie <rex.nie@...uarmicro.com>,
 Dave Martin <dave.martin@....com>, Koba Ko <kobak@...dia.com>,
 Shanker Donthineni <sdonthineni@...dia.com>, fenghuay@...dia.com,
 baisheng.gao@...soc.com, Jonathan Cameron <jonathan.cameron@...wei.com>,
 Rob Herring <robh@...nel.org>, Rohit Mathew <rohit.mathew@....com>,
 Rafael Wysocki <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>, Hanjun Guo
 <guohanjun@...wei.com>, Sudeep Holla <sudeep.holla@....com>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Catalin Marinas <catalin.marinas@....com>,
 Will Deacon <will@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Danilo Krummrich <dakr@...nel.org>
Subject: Re: [PATCH 02/33] drivers: base: cacheinfo: Add helper to find the
 cache size from cpu+level

Hi Krzysztof,

On 24/08/2025 18:25, Krzysztof Kozlowski wrote:
> On 22/08/2025 17:29, James Morse wrote:
>> MPAM needs to know the size of a cache associated with a particular CPU.
>> The DT/ACPI agnostic way of doing this is to ask cacheinfo.
>>
>> Add a helper to do this.

>> ---
>> Changes since v1:
> 
> You marked this as v1.

Oops - that should say RFC. I'll fix all those.


>>  * Converted to kdoc.
>>  * Simplified helper to use get_cpu_cacheinfo_level().

> Please use consistent subject prefixes. Look at previous patch subject
> prefix.

Presumably the previous patch in my series - this is a side effect of multiple branches
that were written at different times getting combined! I'll change it to 'cacheinfo:' as
that seems to be the most popular recently.


Thanks,

James