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Subject[PATCH v2 06/10] x86/resctrl: Introduce mon_configurable to detect Bandwidth Monitoring Event Configuration
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Date
Newer AMD processors support the new feature Bandwidth Monitoring Event
Configuration (BMEC). The events mbm_total_bytes and mbm_local_bytes
are configurable when this feature is present.

Set mon_configurable if the feature is available.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
arch/x86/kernel/cpu/resctrl/monitor.c | 14 ++++++++++++++
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 17 +++++++++++++++++
include/linux/resctrl.h | 1 +
3 files changed, 32 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index eaf25a234ff5..b9de417dac1c 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -682,6 +682,16 @@ static void l3_mon_evt_init(struct rdt_resource *r)
list_add_tail(&mbm_local_event.list, &r->evt_list);
}

+
+void __rdt_get_mon_l3_config_amd(struct rdt_resource *r)
+{
+ /*
+ * Check if CPU supports the Bandwidth Monitoring Event Configuration
+ */
+ if (boot_cpu_has(X86_FEATURE_BMEC))
+ r->mon_configurable = true;
+}
+
int rdt_get_mon_l3_config(struct rdt_resource *r)
{
unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
@@ -714,6 +724,10 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)
if (ret)
return ret;

+ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+ __rdt_get_mon_l3_config_amd(r);
+
+
l3_mon_evt_init(r);

r->mon_capable = true;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index fc5286067201..855483b297a8 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -995,6 +995,16 @@ static int rdt_num_rmids_show(struct kernfs_open_file *of,
return 0;
}

+static int rdt_mon_configurable_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct rdt_resource *r = of->kn->parent->priv;
+
+ seq_printf(seq, "%d\n", r->mon_configurable);
+
+ return 0;
+}
+
static int rdt_mon_features_show(struct kernfs_open_file *of,
struct seq_file *seq, void *v)
{
@@ -1447,6 +1457,13 @@ static struct rftype res_common_files[] = {
.seq_show = rdt_num_rmids_show,
.fflags = RF_MON_INFO,
},
+ {
+ .name = "mon_configurable",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_mon_configurable_show,
+ .fflags = RF_MON_INFO,
+ },
{
.name = "cbm_mask",
.mode = 0444,
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 21deb5212bbd..4ee2b606ac14 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -154,6 +154,7 @@ struct rdt_resource {
bool mon_enabled;
bool alloc_capable;
bool mon_capable;
+ bool mon_configurable;
int num_rmid;
int cache_level;
struct resctrl_cache cache;

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