[PATCH v3 36/47] arm_mpam: resctrl: Add resctrl_arch_cntr_read() & resctrl_arch_reset_cntr()

Ben Horgan
2026-01-12T17:03:09Z

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

When used in ABMC mode, resctrl uses a different set of helpers to read and
reset the counters.

Add these.

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 | 43 ++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)

diff --git a/drivers/resctrl/mpam_resctrl.c b/drivers/resctrl/mpam_resctrl.c
index 921be9b53c00..5adc78f9c96f 100644
--- a/drivers/resctrl/mpam_resctrl.c
+++ b/drivers/resctrl/mpam_resctrl.c
@@ -463,6 +463,28 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d,
closid, rmid, val);
}

+/* MBWU counters when in ABMC mode */
+int resctrl_arch_cntr_read(struct rdt_resource *r, struct rdt_mon_domain *d,
+ u32 closid, u32 rmid, int mon_idx,
+ enum resctrl_event_id eventid, u64 *val)
+{
+ struct mpam_resctrl_mon *mon = &mpam_resctrl_counters[eventid];
+ struct mpam_resctrl_dom *l3_dom;
+ struct mpam_component *mon_comp;
+
+ if (!mpam_is_enabled())
+ return -EINVAL;
+
+ if (eventid == QOS_L3_OCCUP_EVENT_ID || !mon->class)
+ return -EINVAL;
+
+ l3_dom = container_of(d, struct mpam_resctrl_dom, resctrl_mon_dom);
+ mon_comp = l3_dom->mon_comp[eventid];
+
+ return read_mon_cdp_safe(mon, mon_comp, mpam_feat_msmon_mbwu, mon_idx,
+ closid, rmid, val);
+}
+
static void __reset_mon(struct mpam_resctrl_mon *mon, struct mpam_component *mon_comp,
int mon_idx,
enum resctrl_conf_type cdp_type, u32 closid, u32 rmid)
@@ -518,6 +540,27 @@ void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_mon_domain *d,
reset_mon_cdp_safe(mon, mon_comp, USE_PRE_ALLOCATED, closid, rmid);
}

+/* Reset an assigned counter */
+void resctrl_arch_reset_cntr(struct rdt_resource *r, struct rdt_mon_domain *d,
+ u32 closid, u32 rmid, int cntr_id,
+ enum resctrl_event_id eventid)
+{
+ struct mpam_resctrl_mon *mon = &mpam_resctrl_counters[eventid];
+ struct mpam_resctrl_dom *l3_dom;
+ struct mpam_component *mon_comp;
+
+ if (!mpam_is_enabled())
+ return;
+
+ if (eventid == QOS_L3_OCCUP_EVENT_ID || !mon->class)
+ return;
+
+ l3_dom = container_of(d, struct mpam_resctrl_dom, resctrl_mon_dom);
+ mon_comp = l3_dom->mon_comp[eventid];
+
+ reset_mon_cdp_safe(mon, mon_comp, USE_PRE_ALLOCATED, closid, rmid);
+}
+
static bool cache_has_usable_cpor(struct mpam_class *class)
{
struct mpam_props *cprops = &class->props;
--
2.43.0