[RFC PATCH 13/36] arm_mpam: Add probe/remove for mpam msc driver and kbuild boiler plate

[James Morse]

Hi Ben,

On 24/07/2025 12:02, Ben Horgan wrote:
> On 11/07/2025 19:36, James Morse wrote:
>> Probing MPAM is convoluted. MSCs that are integrated with a CPU may
>> only be accessible from those CPUs, and they may not be online.
>> Touching the hardware early is pointless as MPAM can't be used until
>> the system-wide common values for num_partid and num_pmg have been
>> discovered.
>>
>> Start with driver probe/remove and mapping the MSC.

>> diff --git a/drivers/platform/arm64/mpam/mpam_devices.c b/drivers/platform/arm64/mpam/
>> mpam_devices.c
>> new file mode 100644
>> index 000000000000..5b886ba54ba8
>> --- /dev/null
>> +++ b/drivers/platform/arm64/mpam/mpam_devices.c
>> @@ -0,0 +1,336 @@

>> +static int mpam_dt_count_msc(void)
>> +{
>> +    int count = 0;
>> +    struct device_node *np;
>> +
>> +    for_each_compatible_node(np, NULL, "arm,mpam-msc")

> This will count even 'status = "disabled"' nodes. Add a check for that.
> 
> if (of_device_is_available(np))> +        count++;

Good spot, fixed - thanks.


Thanks,

James


>> +
>> +    return count;
>> +}