RE: [PATCH 22/33] arm_mpam: Use a static key to indicate when mpam is enabled

Shaopeng Tan (Fujitsu)
2025-11-14T04:37:17Z

> From: James Morse <james.morse@arm.com>
>
> Once all the MSC have been probed, the system wide usable number of
> PARTID is known and the configuration arrays can be allocated.
>
> After this point, checking all the MSC have been probed is pointless, and the
> cpuhp callbacks should restore the configuration, instead of just resetting the
> MSC.
>
> Add a static key to enable this behaviour. This will also allow MPAM to be
> disabled in response to an error, and the architecture code to enable/disable
> the context switch of the MPAM system registers.
>
> Signed-off-by: James Morse <james.morse@arm.com>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
> Reviewed-by: Ben Horgan <ben.horgan@arm.com>
> Reviewed-by: Fenghua Yu <fenghuay@nvidia.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>