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

[Shaopeng Tan (Fujitsu)]

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

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