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x86/resctrl: Support monitor configuration

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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: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20230113152039.770054-9-babu.moger@amd.com
This commit is contained in:
Babu Moger
2023-01-13 09:20:34 -06:00
committed by Borislav Petkov (AMD)
parent bd334c86b5
commit d507f83ced
3 changed files with 13 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kernel/cpu/resctrl/internal.h
View File

@@ -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;
};

7
arch/x86/kernel/cpu/resctrl/monitor.c
View File

@@ -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;

5
arch/x86/kernel/cpu/resctrl/rdtgroup.c
View File

@@ -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;
}