Commit d507f83c authored by Babu Moger's avatar Babu Moger Committed by Borislav Petkov (AMD)
Browse files

x86/resctrl: Support monitor configuration 



Add a new field in struct mon_evt to support Bandwidth Monitoring Event
Configuration (BMEC) and also update the "mon_features" display.

The resctrl file "mon_features" will display the supported events
and files that can be used to configure those events if monitor
configuration is supported.

Before the change:

  $ cat /sys/fs/resctrl/info/L3_MON/mon_features
  llc_occupancy
  mbm_total_bytes
  mbm_local_bytes

After the change when BMEC is supported:

  $ cat /sys/fs/resctrl/info/L3_MON/mon_features
  llc_occupancy
  mbm_total_bytes
  mbm_total_bytes_config
  mbm_local_bytes
  mbm_local_bytes_config

Signed-off-by: default avatarBabu Moger <babu.moger@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: default avatarReinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20230113152039.770054-9-babu.moger@amd.com
parent bd334c86

arch/x86/kernel/cpu/resctrl/internal.h

+2 −0
Original line number Diff line number Diff line
@@ -52,11 +52,13 @@ DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key); 
 * struct mon_evt - Entry in the event list of a resource

 * @evtid:		event id

 * @name:		name of the event

 * @configurable:	true if the event is configurable

 * @list:		entry in &rdt_resource->evt_list

 */

struct mon_evt {

	enum resctrl_event_id	evtid;

	char			*name;

	bool			configurable;

	struct list_head	list;

};

arch/x86/kernel/cpu/resctrl/monitor.c

+7 −0
Original line number Diff line number Diff line
@@ -800,6 +800,13 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r) 
	if (ret)

		return ret;



	if (rdt_cpu_has(X86_FEATURE_BMEC)) {

		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL))

			mbm_total_event.configurable = true;

		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))

			mbm_local_event.configurable = true;

	}



	l3_mon_evt_init(r);



	r->mon_capable = true;

arch/x86/kernel/cpu/resctrl/rdtgroup.c

+4 −1
Original line number Diff line number Diff line
@@ -998,8 +998,11 @@ static int rdt_mon_features_show(struct kernfs_open_file *of, 
	struct rdt_resource *r = of->kn->parent->priv;

	struct mon_evt *mevt;



	list_for_each_entry(mevt, &r->evt_list, list)

	list_for_each_entry(mevt, &r->evt_list, list) {

		seq_printf(seq, "%s\n", mevt->name);

		if (mevt->configurable)

			seq_printf(seq, "%s_config\n", mevt->name);

	}



	return 0;

}