[PATCH v12 18/26] x86/resctrl: Add default MBM event configurations for mbm_cntr_assign mode

Babu Moger
2025-04-04T00:21:39Z

By default, each resctrl group supports two MBM events: mbm_total_bytes
and mbm_local_bytes. To maintain the same level of support, two default
MBM configurations are added. These configurations will initially be used
to set up the counters upon mounting, while users will have the option to
modify them as needed.

Event configuration values:
========================================================
Bits Mnemonics Description
==== ========================================================
6 VictimBW Dirty Victims from all types of memory
5 RmtSlowFill Reads to slow memory in the non-local NUMA domain
4 LclSlowFill Reads to slow memory in the local NUMA domain
3 RmtNTWr Non-temporal writes to non-local NUMA domain
2 LclNTWr Non-temporal writes to local NUMA domain
1 mtFill Reads to memory in the non-local NUMA domain
0 LclFill Reads to memory in the local NUMA domain
==== ========================================================

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
v12: New patch to support event configurations via new counter_configs
method.
---
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 15 +++++++++++++++
include/linux/resctrl_types.h | 17 +++++++++++++++++
2 files changed, 32 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index d84f47db4e43..aba23e2096db 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -57,6 +57,21 @@ static struct kernfs_node *kn_mongrp;
/* Kernel fs node for "mon_data" directory under root */
static struct kernfs_node *kn_mondata;

+struct mbm_evt_value mbm_evt_values[NUM_MBM_EVT_VALUES] = {
+ {"local_reads", 0x1},
+ {"remote_reads", 0x2},
+ {"local_non_temporal_writes", 0x4},
+ {"remote_non_temporal_writes", 0x8},
+ {"local_reads_slow_memory", 0x10},
+ {"remote_reads_slow_memory", 0x20},
+ {"dirty_victim_writes_all", 0x40},
+};
+
+struct mbm_assign_config mbm_assign_configs[NUM_MBM_ASSIGN_CONFIGS] = {
+ {"mbm_total_bytes", QOS_L3_MBM_TOTAL_EVENT_ID, 0x7f},
+ {"mbm_local_bytes", QOS_L3_MBM_LOCAL_EVENT_ID, 0x15},
+};
+
/*
* Used to store the max resource name width to display the schemata names in
* a tabular format.
diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
index f26450b3326b..3d98c7bdb459 100644
--- a/include/linux/resctrl_types.h
+++ b/include/linux/resctrl_types.h
@@ -31,6 +31,9 @@
/* Max event bits supported */
#define MAX_EVT_CONFIG_BITS GENMASK(6, 0)

+#define NUM_MBM_EVT_VALUES 7
+#define NUM_MBM_ASSIGN_CONFIGS 2
+
enum resctrl_res_level {
RDT_RESOURCE_L3,
RDT_RESOURCE_L2,
@@ -51,4 +54,18 @@ enum resctrl_event_id {
QOS_L3_MBM_LOCAL_EVENT_ID = 0x03,
};

+struct mbm_evt_value {
+ char evt_name[32];
+ u32 evt_val;
+};
+
+/**
+ * struct mbm_assign_config - Configuration values
+ */
+struct mbm_assign_config {
+ char name[32];
+ enum resctrl_event_id evtid;
+ u32 val;
+};
+
#endif /* __LINUX_RESCTRL_TYPES_H */
--
2.34.1