Commit df624da4 authored by Babu Moger's avatar Babu Moger Committed by Wenkuan Wang
Browse files

x86/resctrl: Add interface to read mbm_local_bytes_config 

mainline inclusion
from mainline-v6.3-rc1
commit 73afb2d3
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I9U2JC


CVE: NA

--------------------------------

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


Signed-off-by: default avatarWenkuan Wang <Wenkuan.Wang@amd.com>
parent 540e1ae2

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

+3 −1
Original line number Diff line number Diff line
@@ -713,8 +713,10 @@ 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
@@ -1555,6 +1555,16 @@ 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[] = {

	{
@@ -1659,6 +1669,12 @@ 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,