Hi Reinette,

On 11/22/22 18:14, Reinette Chatre wrote:

Hi Babu,

On 11/4/2022 1:00 PM, Babu Moger wrote:

quoted

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

The sysfs file "mon_features" will display the monitor configuration

sysfs -> resctrl ?

Sure.

quoted

if supported.

This is not clear. "mon_features" does not display the monitor
configuration, it displays the name of the file that can be used to 
see the monitor configuration.

Will change it to:

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

quoted

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>
---
 arch/x86/kernel/cpu/resctrl/internal.h |    2 ++
 arch/x86/kernel/cpu/resctrl/monitor.c  |    6 ++++++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |    5 ++++-
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index e30e8b23f6b5..5459b5022760 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h

@@ -63,11 +63,13 @@ 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;
 };
 

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index efe0c30d3a12..06c2dc980855 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c

@@ -750,6 +750,7 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)
 {
 	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+	bool mon_configurable = rdt_cpu_has(X86_FEATURE_BMEC);
 	unsigned int threshold;
 	int ret;
 

@@ -783,6 +784,11 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)
 	if (ret)
 		return ret;
 
+	if (mon_configurable) {
+		mbm_total_event.configurable = true;
+		mbm_local_event.configurable = true;
+	}
+

Is the local variable needed? Why not just:
	if (rdt_cpu_has(X86_FEATURE_BMEC))

Local variable not requited. Will change it.

Thanks

Babu

Reinette

-- 
Thanks
Babu Moger