[PATCH v3 33/47] arm_mpam: resctrl: Add resctrl_arch_config_cntr() for ABMC use

Ben Horgan
2026-01-12T17:02:52Z

From: James Morse <james.morse@arm.com>

ABMC has a helper resctrl_arch_config_cntr() for changing the mapping
between 'cntr_id' and a CLOSID/RMID pair.

Add the helper.

For MPAM this is done by updating the mon->mbwu_idx_to_mon[] array, and as
usual CDP means it needs doing in three different ways.

Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
---
drivers/resctrl/mpam_resctrl.c | 37 ++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)

diff --git a/drivers/resctrl/mpam_resctrl.c b/drivers/resctrl/mpam_resctrl.c
index 2a9efc6c6fae..9198af3221d5 100644
--- a/drivers/resctrl/mpam_resctrl.c
+++ b/drivers/resctrl/mpam_resctrl.c
@@ -776,6 +776,43 @@ static void mpam_resctrl_pick_counters(void)
mpam_resctrl_counters[QOS_L3_MBM_TOTAL_EVENT_ID].class);
}

+static void __config_cntr(struct mpam_resctrl_mon *mon, u32 cntr_id,
+ enum resctrl_conf_type cdp_type, u32 closid, u32 rmid,
+ bool assign)
+{
+ u32 mbwu_idx, mon_idx = resctrl_get_config_index(cntr_id, cdp_type);
+
+ closid = resctrl_get_config_index(closid, cdp_type);
+ mbwu_idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+ WARN_ON_ONCE(mon_idx > l3_num_allocated_mbwu);
+
+ if (assign)
+ mon->mbwu_idx_to_mon[mbwu_idx] = mon->assigned_counters[mon_idx];
+ else
+ mon->mbwu_idx_to_mon[mbwu_idx] = -1;
+}
+
+void resctrl_arch_config_cntr(struct rdt_resource *r, struct rdt_mon_domain *d,
+ enum resctrl_event_id evtid, u32 rmid, u32 closid,
+ u32 cntr_id, bool assign)
+{
+ struct mpam_resctrl_mon *mon = &mpam_resctrl_counters[evtid];
+
+ if (!mon->mbwu_idx_to_mon || !mon->assigned_counters) {
+ pr_debug("monitor arrays not allocated\n");
+ return;
+ }
+
+ if (cdp_enabled) {
+ __config_cntr(mon, cntr_id, CDP_CODE, closid, rmid, assign);
+ __config_cntr(mon, cntr_id, CDP_DATA, closid, rmid, assign);
+ } else {
+ __config_cntr(mon, cntr_id, CDP_NONE, closid, rmid, assign);
+ }
+
+ resctrl_arch_reset_rmid(r, d, closid, rmid, evtid);
+}
+
bool resctrl_arch_mbm_cntr_assign_enabled(struct rdt_resource *r)
{
if (r != &mpam_resctrl_controls[RDT_RESOURCE_L3].resctrl_res)
--
2.43.0