linux-kernel - Re: [PATCH 11/33] arm_mpam: Add the class and component structures for firmware described ris

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Message-ID: <365d8625-17fc-41f1-b7ab-d7ef3ab06b92@arm.com>
Date: Wed, 12 Nov 2025 16:48:55 +0000
From: Ben Horgan <ben.horgan@....com>
To: Gavin Shan <gshan@...hat.com>, james.morse@....com
Cc: amitsinght@...vell.com, baisheng.gao@...soc.com,
 baolin.wang@...ux.alibaba.com, bobo.shaobowang@...wei.com,
 carl@...amperecomputing.com, catalin.marinas@....com, dakr@...nel.org,
 dave.martin@....com, david@...hat.com, dfustini@...libre.com,
 fenghuay@...dia.com, gregkh@...uxfoundation.org, guohanjun@...wei.com,
 jeremy.linton@....com, jonathan.cameron@...wei.com, kobak@...dia.com,
 lcherian@...vell.com, lenb@...nel.org, linux-acpi@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 lpieralisi@...nel.org, peternewman@...gle.com, quic_jiles@...cinc.com,
 rafael@...nel.org, robh@...nel.org, rohit.mathew@....com,
 scott@...amperecomputing.com, sdonthineni@...dia.com, sudeep.holla@....com,
 tan.shaopeng@...itsu.com, will@...nel.org, xhao@...ux.alibaba.com,
 Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Subject: Re: [PATCH 11/33] arm_mpam: Add the class and component structures
 for firmware described ris

Hi Gavin,

I was a bit hasty on one of those changes.

On 11/12/25 16:39, Ben Horgan wrote:
> Hi Gavin,
> 
> On 11/9/25 00:07, Gavin Shan wrote:
>> Hi Ben,
>>
>> On 11/7/25 10:34 PM, Ben Horgan wrote:
>>> From: James Morse <james.morse@....com>
>>>
>>> An MSC is a container of resources, each identified by their RIS index.
>>> Some RIS are described by firmware to provide their position in the
>>> system.
>>> Others are discovered when the driver probes the hardware.
>>>
>>> To configure a resource it needs to be found by its class, e.g. 'L2'.
>>> There are two kinds of grouping, a class is a set of components, which
>>> are visible to user-space as there are likely to be multiple instances
>>> of the L2 cache. (e.g. one per cluster or package)
>>>
>>> Add support for creating and destroying structures to allow a hierarchy
>>> of resources to be created.
>>>
>>> CC: Ben Horgan <ben.horgan@....com>
>>> Tested-by: Fenghua Yu <fenghuay@...dia.com>
>>> Tested-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
>>> Tested-by: Peter Newman <peternewman@...gle.com>
>>> Signed-off-by: James Morse <james.morse@....com>
>>> Signed-off-by: Ben Horgan <ben.horgan@....com>

>> This function is only used in mpam_devices.c and won't be exposed in the
>> future, we can make it 'static' and 'inline'.
> 
> Done

Gets used later in mpam_resctl.c so I'll keep as is.

Thanks,

Ben