Re: [PATCH 17/33] arm_mpam: Merge supported features during mpam_enable() into mpam_class

[Gavin Shan]

On 11/7/25 10:34 PM, Ben Horgan wrote:
> From: James Morse <james.morse@xxxxxxx>
>
> 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@xxxxxxx>
> Reviewed-by: Ben Horgan <ben.horgan@xxxxxxx>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>
> Reviewed-by: Fenghua Yu <fenghuay@xxxxxxxxxx>
> Tested-by: Fenghua Yu <fenghuay@xxxxxxxxxx>
> Tested-by: Shaopeng Tan <tan.shaopeng@xxxxxxxxxxxxxx>
> Tested-by: Peter Newman <peternewman@xxxxxxxxxx>
> Signed-off-by: Ben Horgan <ben.horgan@xxxxxxx>
> ---
>   drivers/resctrl/mpam_devices.c  | 214 ++++++++++++++++++++++++++++++++
>   drivers/resctrl/mpam_internal.h |   3 +
>   2 files changed, 217 insertions(+)

Reviewed-by: Gavin Shan <gshan@xxxxxxxxxx>