[PATCH 29/33] arm_mpam: Probe for long/lwd mbwu counters

[Gavin Shan]

On 11/7/25 10:34 PM, Ben Horgan wrote:
> From: Rohit Mathew <rohit.mathew at arm.com>
> 
> mpam v0.1 and versions above v1.0 support optional long counter for
> memory bandwidth monitoring. The MPAMF_MBWUMON_IDR register has fields
> indicating support for long counters.
> 
> Probe these feature bits.
> 
> The mpam_feat_msmon_mbwu feature is used to indicate that bandwidth
> monitors are supported, instead of muddling this with which size of
> bandwidth monitors, add an explicit 31 bit counter feature.
> 
> Signed-off-by: Rohit Mathew <rohit.mathew at arm.com>
> [ morse: Added 31bit counter feature to simplify later logic ]
> Signed-off-by: James Morse <james.morse at arm.com>
> Reviewed-by: Ben Horgan <ben.horgan at arm.com>
> Reviewed-by: Jonathan Cameron <jonathan.cameron at huawei.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>
> ---
> Changes since v3:
> Only set the exact counter length that is supported
> ---
>   drivers/resctrl/mpam_devices.c  | 34 +++++++++++++++++++++------------
>   drivers/resctrl/mpam_internal.h |  3 +++
>   2 files changed, 25 insertions(+), 12 deletions(-)
> 

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