x86/resctrl: Add interface to read mbm_local_bytes_config

The event configuration can be viewed by the user by reading the configuration
file /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config.  The event
configuration settings are domain specific and will affect all the CPUs in the
domain.

Following are the types of events supported:

  ====  ===========================================================
  Bits   Description
  ====  ===========================================================
  6      Dirty Victims from the QOS domain to all types of memory
  5      Reads to slow memory in the non-local NUMA domain
  4      Reads to slow memory in the local NUMA domain
  3      Non-temporal writes to non-local NUMA domain
  2      Non-temporal writes to local NUMA domain
  1      Reads to memory in the non-local NUMA domain
  0      Reads to memory in the local NUMA domain
  ====  ===========================================================

By default, the mbm_local_bytes_config is set to 0x15 to count all the local
event types.

For example:

  $cat /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config
  0=0x15;1=0x15;2=0x15;3=0x15

In this case, the event mbm_local_bytes is configured with 0x15 on
domains 0 to 3.

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/20230113152039.770054-11-babu.moger@amd.com

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 0ff45e3..28c6500 100644 (file)
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -805,8 +805,10 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
                        mbm_total_event.configurable = true;
                        mbm_config_rftype_init("mbm_total_bytes_config");
                }
-               if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))
+               if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL)) {
                        mbm_local_event.configurable = true;
+                       mbm_config_rftype_init("mbm_local_bytes_config");
+               }
        }
 
        l3_mon_evt_init(r);

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index cd4e668..ad3c701 100644 (file)
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1507,6 +1507,16 @@ static int mbm_total_bytes_config_show(struct kernfs_open_file *of,
        return 0;
 }
 
+static int mbm_local_bytes_config_show(struct kernfs_open_file *of,
+                                      struct seq_file *seq, void *v)
+{
+       struct rdt_resource *r = of->kn->parent->priv;
+
+       mbm_config_show(seq, r, QOS_L3_MBM_LOCAL_EVENT_ID);
+
+       return 0;
+}
+
 /* rdtgroup information files for one cache resource. */
 static struct rftype res_common_files[] = {
        {
@@ -1612,6 +1622,12 @@ static struct rftype res_common_files[] = {
                .seq_show       = mbm_total_bytes_config_show,
        },
        {
+               .name           = "mbm_local_bytes_config",
+               .mode           = 0444,
+               .kf_ops         = &rdtgroup_kf_single_ops,
+               .seq_show       = mbm_local_bytes_config_show,
+       },
+       {
                .name           = "cpus",
                .mode           = 0644,
                .kf_ops         = &rdtgroup_kf_single_ops,