linux-kernel - Re: [PATCH 17/33] arm_mpam: Merge supported features during mpam_enable() into mpam

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Message-ID: <f7b7ffd7-8674-4368-aee4-4376d127b0da@redhat.com>
Date: Mon, 10 Nov 2025 07:59:33 +1000
From: Gavin Shan <gshan@...hat.com>
To: Ben Horgan <ben.horgan@....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 17/33] arm_mpam: Merge supported features during
 mpam_enable() into mpam_class

On 11/7/25 10:34 PM, Ben Horgan wrote:
> From: James Morse <james.morse@....com>
> 
> To make a decision about whether to expose an mpam class as
> a resctrl resource we need to know its overall supported
> features and properties.
> 
> Once we've probed all the resources, we can walk the tree
> and produce overall values by merging the bitmaps. This
> eliminates features that are only supported by some MSC
> that make up a component or class.
> 
> If bitmap properties are mismatched within a component we
> cannot support the mismatched feature.
> 
> Care has to be taken as vMSC may hold mismatched RIS.
> 
> Signed-off-by: James Morse <james.morse@....com>
> Reviewed-by: Ben Horgan <ben.horgan@....com>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
> Reviewed-by: Fenghua Yu <fenghuay@...dia.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: Ben Horgan <ben.horgan@....com>
> ---
>   drivers/resctrl/mpam_devices.c  | 214 ++++++++++++++++++++++++++++++++
>   drivers/resctrl/mpam_internal.h |   3 +
>   2 files changed, 217 insertions(+)
> 

Reviewed-by: Gavin Shan <gshan@...hat.com>