[PATCH v10 12/24] x86/resctrl: Introduce cntr_cfg to track assignable counters at domain

[Babu Moger]

In mbm_assign_mode, the MBM counters are assigned/unassigned to an RMID,
event pair in a resctrl group and monitor the bandwidth as long as it is
assigned. Counters are assigned/unassigned at domain level and needs to
be tracked at domain level.

Add the mbm_assign_cntr_cfg data structure to struct rdt_ctrl_domain to
manage and track MBM counter assignments at the domain level.

Suggested-by: Peter Newman <peternewman@xxxxxxxxxx>
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
v10: Patch changed completely to handle the counters at domain level.
     https://lore.kernel.org/lkml/CALPaoCj+zWq1vkHVbXYP0znJbe6Ke3PXPWjtri5AFgD9cQDCUg@xxxxxxxxxxxxxx/
     Removed Reviewed-by tag.
     Did not see the need to add cntr_id in mbm_state structure. Not used in the code.

v9: Added Reviewed-by tag. No other changes.

v8: Minor commit message changes.

v7: Added check mbm_cntr_assignable for allocating bitmap mbm_cntr_map

v6: New patch to add domain level assignment.
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 11 +++++++++++
 include/linux/resctrl.h                | 12 ++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 682f47e0beb1..1ee008a63d8b 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4068,6 +4068,7 @@ static void __init rdtgroup_setup_default(void)
 
 static void domain_destroy_mon_state(struct rdt_mon_domain *d)
 {
+	kfree(d->cntr_cfg);
 	bitmap_free(d->rmid_busy_llc);
 	kfree(d->mbm_total);
 	kfree(d->mbm_local);
@@ -4141,6 +4142,16 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_mon_domain
 			return -ENOMEM;
 		}
 	}
+	if (is_mbm_enabled() && r->mon.mbm_cntr_assignable) {
+		tsize = sizeof(*d->cntr_cfg);
+		d->cntr_cfg = kcalloc(r->mon.num_mbm_cntrs, tsize, GFP_KERNEL);
+		if (!d->cntr_cfg) {
+			bitmap_free(d->rmid_busy_llc);
+			kfree(d->mbm_total);
+			kfree(d->mbm_local);
+			return -ENOMEM;
+		}
+	}
 
 	return 0;
 }
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index c8ab3d7a0dab..03c67d9156f3 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -94,6 +94,16 @@ struct rdt_ctrl_domain {
 	u32				*mbps_val;
 };
 
+/**
+ * struct mbm_cntr_cfg -Assignable counter configuration
+ * @evtid:		Event type
+ * @rdtgroup:		Resctrl group assigned to the counter
+ */
+struct mbm_cntr_cfg {
+	enum resctrl_event_id	evtid;
+	struct rdtgroup		*rdtgrp;
+};
+
 /**
  * struct rdt_mon_domain - group of CPUs sharing a resctrl monitor resource
  * @hdr:		common header for different domain types
@@ -105,6 +115,7 @@ struct rdt_ctrl_domain {
  * @cqm_limbo:		worker to periodically read CQM h/w counters
  * @mbm_work_cpu:	worker CPU for MBM h/w counters
  * @cqm_work_cpu:	worker CPU for CQM h/w counters
+ * @cntr_cfg:		Assignable counters configuration
  */
 struct rdt_mon_domain {
 	struct rdt_domain_hdr		hdr;
@@ -116,6 +127,7 @@ struct rdt_mon_domain {
 	struct delayed_work		cqm_limbo;
 	int				mbm_work_cpu;
 	int				cqm_work_cpu;
+	struct mbm_cntr_cfg		*cntr_cfg;
 };
 
 /**
-- 
2.34.1