Commit 73afb2d3 authored Jan 13, 2023 by Babu Moger Committed by Borislav Petkov (AMD) Jan 23, 2023

x86/resctrl: Add interface to read mbm_local_bytes_config



The event configuration can be viewed by the user by reading the configuration
file /sys/fs/resctrl/info/L3_MON/mbm_local_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_local_bytes_config is set to 0x15 to count all the local
event types.

For example:

  $cat /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config
  0=0x15;1=0x15;2=0x15;3=0x15

In this case, the event mbm_local_bytes is configured with 0x15 on
domains 0 to 3.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20230113152039.770054-11-babu.moger@amd.com

parent dc2a3e85

arch/x86/kernel/cpu/resctrl/monitor.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -805,8 +805,10 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
		mbm_total_event.configurable = true;
		mbm_config_rftype_init("mbm_total_bytes_config");
		}
		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))
		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL)) {
		mbm_local_event.configurable = true;
		mbm_config_rftype_init("mbm_local_bytes_config");
		}
		}

		l3_mon_evt_init(r);

arch/x86/kernel/cpu/resctrl/rdtgroup.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -1507,6 +1507,16 @@ static int mbm_total_bytes_config_show(struct kernfs_open_file *of,
		return 0;
		}

		static int mbm_local_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_LOCAL_EVENT_ID);

		return 0;
		}

		/* rdtgroup information files for one cache resource. */
		static struct rftype res_common_files[] = {
		{
		@@ -1611,6 +1621,12 @@ static struct rftype res_common_files[] = {
		.kf_ops = &rdtgroup_kf_single_ops,
		.seq_show = mbm_total_bytes_config_show,
		},
		{
		.name = "mbm_local_bytes_config",
		.mode = 0444,
		.kf_ops = &rdtgroup_kf_single_ops,
		.seq_show = mbm_local_bytes_config_show,
		},
		{
		.name = "cpus",
		.mode = 0644,