The ABMC feature provides an option to the user to assign an RMID
to the hardware counter and monitor the bandwidth for a longer duration.
System can be in only one mode at a time (Legacy Monitor mode or ABMC
mode). By default, ABMC mode is disabled.
Provide an interface to display the monitor mode on the system.
$cat /sys/fs/resctrl/info/L3_MON/mbm_assign_enable
0
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
v2: This is new patch to display ABMC mode.
---
Documentation/arch/x86/resctrl.rst | 6 ++++++
arch/x86/kernel/cpu/resctrl/monitor.c | 5 ++++-
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 17 +++++++++++++++++
3 files changed, 27 insertions(+), 1 deletion(-)
diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 73eeb50fd0b5..f94a4d314690 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -268,6 +268,12 @@ with the following files:
Available when ABMC feature is supported. The number of assignable bandwidth
monitoring counters available.
+"mbm_assign_enable":
+ Available when ABMC feature is supported. System supports RMID counter
+ assignment for monitoring. Feature provides an option to assign the RMID
+ to the hardware counter and monitor the bandwidth for a longer duration.
+ The assigned RMID will be active until the user unassigns it.
+
"max_threshold_occupancy":
Read/write file provides the largest value (in
bytes) at which a previously used LLC_occupancy
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index fa492ea820f0..a45084e30738 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -824,9 +824,12 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
}
- if (rdt_cpu_has(X86_FEATURE_ABMC))
+ if (rdt_cpu_has(X86_FEATURE_ABMC)) {
resctrl_file_fflags_init("mbm_assignable_counters",
RFTYPE_MON_INFO);
+ resctrl_file_fflags_init("mbm_assign_enable",
+ RFTYPE_MON_INFO);
+ }
}
l3_mon_evt_init(r);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 2fb26227cbec..4f160dbf6376 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -822,6 +822,17 @@ static int rdtgroup_mbm_assignable_counters_show(struct kernfs_open_file *of,
return 0;
}
+static int rdtgroup_mbm_assign_enable_show(struct kernfs_open_file *of,
+ struct seq_file *s, void *v)
+{
+ struct rdt_resource *r = of->kn->parent->priv;
+ struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+
+ seq_printf(s, "%d\n", hw_res->abmc_enabled);
+
+ return 0;
+}
+
#ifdef CONFIG_PROC_CPU_RESCTRL
/*
@@ -1878,6 +1889,12 @@ static struct rftype res_common_files[] = {
.kf_ops = &rdtgroup_kf_single_ops,
.seq_show = rdtgroup_mbm_assignable_counters_show,
},
+ {
+ .name = "mbm_assign_enable",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdtgroup_mbm_assign_enable_show,
+ },
{
.name = "cpus",
.mode = 0644,
--
2.34.1
