Re: [PATCH v2 11/29] arm_mpam: Probe hardware to find the supported partid/pmg values

James Morse
2025-09-29T17:44:48Z

Hi Ben,

On 12/09/2025 12:11, Ben Horgan wrote:
> On 9/10/25 21:42, James Morse wrote:
>> CPUs can generate traffic with a range of PARTID and PMG values,
>> but each MSC may also have its own maximum size for these fields.
>> Before MPAM can be used, the driver needs to probe each RIS on
>> each MSC, to find the system-wide smallest value that can be used.
>> The limits from requestors (e.g. CPUs) also need taking into account.
>>
>> While doing this, RIS entries that firmware didn't describe are created
>> under MPAM_CLASS_UNKNOWN.
>>
>> While we're here, implement the mpam_register_requestor() call
>> for the arch code to register the CPU limits. Future callers of this
>> will tell us about the SMMU and ITS.

> Looks good to me. I think Jonathan's comment on getting rid of the local
> variable, 'found', is worthwhile.
>
> Reviewed-by: Ben Horgan <ben.horgan@arm.com>

Thanks!

James