linux-kernel - [tip: x86/cache] x86/resctrl: Add interface to read mbm_local_bytes

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Message-ID: <167455239634.4906.11848181129312661544.tip-bot2@tip-bot2>
Date:   Tue, 24 Jan 2023 09:26:36 -0000
From:   "tip-bot2 for Babu Moger" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Babu Moger <babu.moger@....com>,
        "Borislav Petkov (AMD)" <bp@...en8.de>,
        Reinette Chatre <reinette.chatre@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/cache] x86/resctrl: Add interface to read mbm_local_bytes_config

The following commit has been merged into the x86/cache branch of tip:

Commit-ID:     73afb2d3ce2d7e0f9eee14e3f2b53d2bbfefd9c8
Gitweb:        https://git.kernel.org/tip/73afb2d3ce2d7e0f9eee14e3f2b53d2bbfefd9c8
Author:        Babu Moger <babu.moger@....com>
AuthorDate:    Fri, 13 Jan 2023 09:20:36 -06:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Mon, 23 Jan 2023 17:40:27 +01:00

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@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Link: https://lore.kernel.org/r/20230113152039.770054-11-babu.moger@amd.com
---
 arch/x86/kernel/cpu/resctrl/monitor.c  |  4 +++-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 16 ++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 0ff45e3..28c6500 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -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);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index cd4e668..ad3c701 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -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[] = {
 	{
@@ -1612,6 +1622,12 @@ static struct rftype res_common_files[] = {
 		.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,
 		.kf_ops		= &rdtgroup_kf_single_ops,