The current event configuration can be viewed by the user by reading
the configuration file /sys/fs/resctrl/info/L3_MON/mbm_total_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_total_bytes_config is set to 0x7f to count all the
event types.
For example:
$cat /sys/fs/resctrl/info/L3_MON/mbm_total_bytes_config
0=0x7f;1=0x7f;2=0x7f;3=0x7f
In this case, the event mbm_total_bytes is currently configured
with 0x7f on domains 0 to 3.
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
arch/x86/kernel/cpu/resctrl/internal.h | 28 ++++++++++
arch/x86/kernel/cpu/resctrl/monitor.c | 1
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 87 ++++++++++++++++++++++++++++++++
3 files changed, 116 insertions(+)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 5459b5022760..c74285fd0f6e 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -15,6 +15,7 @@
#define MSR_IA32_MBA_THRTL_BASE 0xd50
#define MSR_IA32_MBA_BW_BASE 0xc0000200
#define MSR_IA32_SMBA_BW_BASE 0xc0000280
+#define MSR_IA32_EVT_CFG_BASE 0xc0000400
#define MSR_IA32_QM_CTR 0x0c8e
#define MSR_IA32_QM_EVTSEL 0x0c8d
@@ -41,6 +42,32 @@
*/
#define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)
+/* Reads to Local DRAM Memory */
+#define READS_TO_LOCAL_MEM BIT(0)
+
+/* Reads to Remote DRAM Memory */
+#define READS_TO_REMOTE_MEM BIT(1)
+
+/* Non-Temporal Writes to Local Memory */
+#define NON_TEMP_WRITE_TO_LOCAL_MEM BIT(2)
+
+/* Non-Temporal Writes to Remote Memory */
+#define NON_TEMP_WRITE_TO_REMOTE_MEM BIT(3)
+
+/* Reads to Local Memory the system identifies as "Slow Memory" */
+#define READS_TO_LOCAL_S_MEM BIT(4)
+
+/* Reads to Remote Memory the system identifies as "Slow Memory" */
+#define READS_TO_REMOTE_S_MEM BIT(5)
+
+/* Dirty Victims to All Types of Memory */
+#define DIRTY_VICTIMS_TO_ALL_MEM BIT(6)
+
+/* Max event bits supported */
+#define MAX_EVT_CONFIG_BITS GENMASK(6, 0)
+
+/* Max configurable events */
+#define MAX_CONFIG_EVENTS 2
struct rdt_fs_context {
struct kernfs_fs_context kfc;
@@ -542,5 +569,6 @@ bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d);
void __check_limbo(struct rdt_domain *d, bool force_free);
void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
void __init thread_throttle_mode_init(void);
+void mbm_config_rftype_init(void);
#endif /* _ASM_X86_RESCTRL_INTERNAL_H */
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 06c2dc980855..a188dacab6c8 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -787,6 +787,7 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)
if (mon_configurable) {
mbm_total_event.configurable = true;
mbm_local_event.configurable = true;
+ mbm_config_rftype_init();
}
l3_mon_evt_init(r);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 8342feb54a7f..dea58b6b4aa4 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1423,6 +1423,78 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
return ret;
}
+struct mon_config_info {
+ u32 evtid;
+ u32 mon_config;
+};
+
+/**
+ * mon_event_config_index_get - get the index for the configurable event
+ * @evtid: event id.
+ *
+ * Return: 0 for evtid == QOS_L3_MBM_TOTAL_EVENT_ID
+ * 1 for evtid == QOS_L3_MBM_LOCAL_EVENT_ID
+ * > 1 otherwise
+ */
+static inline unsigned int mon_event_config_index_get(u32 evtid)
+{
+ return evtid - QOS_L3_MBM_TOTAL_EVENT_ID;
+}
+
+static void mon_event_config_read(void *info)
+{
+ struct mon_config_info *mon_info = info;
+ u32 h, index;
+
+ index = mon_event_config_index_get(mon_info->evtid);
+ if (index >= MAX_CONFIG_EVENTS) {
+ pr_warn_once("Invalid event id %d\n", mon_info->evtid);
+ return;
+ }
+ rdmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, h);
+}
+
+static void mondata_config_read(struct rdt_domain *d, struct mon_config_info *mon_info)
+{
+ smp_call_function_any(&d->cpu_mask, mon_event_config_read, mon_info, 1);
+}
+
+static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
+{
+ struct mon_config_info mon_info = {0};
+ struct rdt_domain *dom;
+ bool sep = false;
+
+ mutex_lock(&rdtgroup_mutex);
+
+ list_for_each_entry(dom, &r->domains, list) {
+ if (sep)
+ seq_puts(s, ";");
+
+ mon_info.evtid = evtid;
+ mondata_config_read(dom, &mon_info);
+
+ seq_printf(s, "%d=0x%02lx", dom->id,
+ mon_info.mon_config & MAX_EVT_CONFIG_BITS);
+ sep = true;
+ }
+ seq_puts(s, "\n");
+
+ mutex_unlock(&rdtgroup_mutex);
+
+ return 0;
+}
+
+static int mbm_total_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_TOTAL_EVENT_ID);
+
+ return 0;
+}
+
/* rdtgroup information files for one cache resource. */
static struct rftype res_common_files[] = {
{
@@ -1521,6 +1593,12 @@ static struct rftype res_common_files[] = {
.seq_show = max_threshold_occ_show,
.fflags = RF_MON_INFO | RFTYPE_RES_CACHE,
},
+ {
+ .name = "mbm_total_bytes_config",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = mbm_total_bytes_config_show,
+ },
{
.name = "cpus",
.mode = 0644,
@@ -1627,6 +1705,15 @@ void __init thread_throttle_mode_init(void)
rft->fflags = RF_CTRL_INFO | RFTYPE_RES_MB;
}
+void mbm_config_rftype_init(void)
+{
+ struct rftype *rft;
+
+ rft = rdtgroup_get_rftype_by_name("mbm_total_bytes_config");
+ if (rft)
+ rft->fflags = RF_MON_INFO | RFTYPE_RES_CACHE;
+}
+
/**
* rdtgroup_kn_mode_restrict - Restrict user access to named resctrl file
* @r: The resource group with which the file is associated.
