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arm_mpam: Set mpam_feat_msmon_mbwu_31counter when there are bandwidth counters

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When MPAMF_MSMON_IDR.MSMON_MBWU is 1, MSMON_MBWU is present and has a VALUE
field of 31 bits. If additionally, MPAMF_MBWUMON_IDR.HAS_LONG is 1, then
MSMON_MBWU_L is also present and has a VALUE field of 44 or 63 bits as
indicated by MPAMF_MBWUMON_IDR.LWD. Hence, if there are memory bandwidth
counters then there are always 31 bit counters irrespective of whether
there also long counters.

Set the 31 bit bandwidth counter feature bit whenever there are bandwidth
counters.

Fixes: fdc29a141d ("arm_mpam: Probe for long/lwd mbwu counters")
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Tested-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
This commit is contained in:
Ben Horgan 2026-09-17 15:56:08 +01:00 committed by James Morse
parent 9ced048825
commit b010d258f3
1 changed files with 2 additions and 2 deletions
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4
drivers/resctrl/mpam_devices.c
View File

@ -930,9 +930,9 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris)
mpam_set_feature(mpam_feat_msmon_mbwu_63counter, props);
else
mpam_set_feature(mpam_feat_msmon_mbwu_44counter, props);
} else {
mpam_set_feature(mpam_feat_msmon_mbwu_31counter, props);
}
mpam_set_feature(mpam_feat_msmon_mbwu_31counter, props);
}
}
}