arch_topology: Support SMT control for OF based system

On building the topology from the devicetree, we've already gotten the
SMT thread number of each core. Update the largest SMT thread number
and enable the SMT control by the end of topology parsing.

The framework's SMT control provides two interface to the users through
/sys/devices/system/cpu/smt/control
(Documentation/ABI/testing/sysfs-devices-system-cpu):

1) enable SMT by writing "on" and disable by "off"
2) enable SMT by writing max_thread_number or disable by writing 1

Both method support to completely disable/enable the SMT cores so both
work correctly for symmetric SMT platform and asymmetric platform with
non-SMT and one type SMT cores like:

core A: 1 thread
core B: X (X!=1) threads

Note that for a theoretically possible multiple SMT-X (X>1) core
platform the SMT control is also supported as expected but only
by writing the "on/off" method.

Reviewed-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20250311075143.61078-3-yangyicong@huawei.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

0 files changed, 0 insertions, 0 deletions