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

Gavin Shan
2025-11-09T22:20:30Z

On 11/7/25 10:34 PM, Ben Horgan wrote:
> 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>
> ---
> drivers/resctrl/mpam_devices.c | 12 ++++++++++++
> drivers/resctrl/mpam_internal.h | 8 ++++++++
> 2 files changed, 20 insertions(+)
>

Reviewed-by: Gavin Shan <gshan@redhat.com>