RE: [PATCH 24/33] arm_mpam: Probe and reset the rest of the features
From: Shaopeng Tan (Fujitsu)
Date: Fri Nov 14 2025 - 02:04:13 EST
> From: James Morse <james.morse@xxxxxxx>
>
> MPAM supports more features than are going to be exposed to resctrl.
> For partid other than 0, the reset values of these controls isn't known.
>
> Discover the rest of the features so they can be reset to avoid any side effects
> when resctrl is in use.
>
> PARTID narrowing allows MSC/RIS to support less configuration space than is
> usable. If this feature is found on a class of device we are likely to use, then
> reduce the partid_max to make it usable. This allows us to map a PARTID to
> itself.
>
> CC: Rohit Mathew <Rohit.Mathew@xxxxxxx>
> CC: Zeng Heng <zengheng4@xxxxxxxxxx>
> CC: Dave Martin <Dave.Martin@xxxxxxx>
> Signed-off-by: James Morse <james.morse@xxxxxxx>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@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>
Reviewed-by: Shaopeng Tan <tan.shaopeng@xxxxxxxxxxxxxx>