RE: [PATCH 24/33] arm_mpam: Probe and reset the rest of the features

Shaopeng Tan (Fujitsu)
2025-11-14T07:04:13Z

> From: James Morse <james.morse@arm.com>
>
> 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@arm.com>
> CC: Zeng Heng <zengheng4@huawei.com>
> CC: Dave Martin <Dave.Martin@arm.com>
> Signed-off-by: James Morse <james.morse@arm.com>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
> Tested-by: Fenghua Yu <fenghuay@nvidia.com>
> Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
> Tested-by: Peter Newman <peternewman@google.com>
> Signed-off-by: Ben Horgan <ben.horgan@arm.com>

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