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

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Date: Wed, 12 Nov 2025 08:24:59 +0000
From: "Shaopeng Tan (Fujitsu)" <tan.shaopeng@...itsu.com>
To: 'Ben Horgan' <ben.horgan@....com>, "james.morse@....com"
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Subject: RE: [PATCH 17/33] arm_mpam: Merge supported features during
 mpam_enable() into mpam_class

> 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>

Reviewed-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>