The ABMC feature provides an option to the user to pin (or assign) the
RMID to the hardware counter and monitor the bandwidth for a longer
duration. There are only a limited number of hardware counters.
Provide the interface to display the number of ABMC counters supported.
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
Documentation/arch/x86/resctrl.rst | 4 ++++
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 29 +++++++++++++++++++++++++-
2 files changed, 32 insertions(+), 1 deletion(-)
diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 19e906f629d4..87aa8eec71b7 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -266,6 +266,10 @@ with the following files:
# cat /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config
0=0x30;1=0x30;3=0x15;4=0x15
+"abmc_counters":
+ Available when ABMC feature is enabled. The number of ABMC counters
+ available for assignment.
+
"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/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 7f6ed903ba17..897707694cc8 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -811,6 +811,17 @@ static int rdtgroup_rmid_show(struct kernfs_open_file *of,
return ret;
}
+static int rdtgroup_abmc_counters_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_counters);
+
+ return 0;
+}
+
#ifdef CONFIG_PROC_CPU_RESCTRL
/*
@@ -1861,6 +1872,12 @@ static struct rftype res_common_files[] = {
.seq_show = mbm_local_bytes_config_show,
.write = mbm_local_bytes_config_write,
},
+ {
+ .name = "abmc_counters",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdtgroup_abmc_counters_show,
+ },
{
.name = "cpus",
.mode = 0644,
@@ -2419,12 +2436,22 @@ static void resctrl_abmc_disable(enum resctrl_res_level l)
int resctrl_arch_set_abmc_enabled(enum resctrl_res_level l, bool enable)
{
struct rdt_hw_resource *hw_res = &rdt_resources_all[l];
+ struct rftype *rft;
if (!hw_res->r_resctrl.abmc_capable)
return -EINVAL;
- if (enable)
+ if (enable) {
+ rft = rdtgroup_get_rftype_by_name("abmc_counters");
+ if (rft)
+ rft->fflags = RFTYPE_MON_INFO;
+
return resctrl_abmc_enable(l);
+ }
+
+ rft = rdtgroup_get_rftype_by_name("abmc_counters");
+ if (rft)
+ rft->fflags &= ~RFTYPE_MON_INFO;
resctrl_abmc_disable(l);
--
2.34.1
