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Subject: [PATCH v6 08/12] x86/resctrl: Add sysfs interface to read
 mbm_local_bytes event configuration
From:   Babu Moger <babu.moger@amd.com>
To:     <corbet@lwn.net>, <reinette.chatre@intel.com>,
        <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>
CC:     <fenghua.yu@intel.com>, <dave.hansen@linux.intel.com>,
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Date:   Mon, 10 Oct 2022 15:29:40 -0500
Message-ID: <166543378060.23830.6262795783125938383.stgit@bmoger-ubuntu>
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The current event configuration can be viewed by the user by reading=0A=
the configuration file /sys/fs/resctrl/info/L3_MON/mbm_local_config.=0A=
=0A=
Following are the types of events supported:=0A=
=0A=
=3D=3D=3D=3D  =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A=
Bits   Description=0A=
=3D=3D=3D=3D  =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A=
6      Dirty Victims from the QOS domain to all types of memory=0A=
5      Reads to slow memory in the non-local NUMA domain=0A=
4      Reads to slow memory in the local NUMA domain=0A=
3      Non-temporal writes to non-local NUMA domain=0A=
2      Non-temporal writes to local NUMA domain=0A=
1      Reads to memory in the non-local NUMA domain=0A=
0      Reads to memory in the local NUMA domain=0A=
=3D=3D=3D=3D  =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A=
=0A=
By default, the mbm_local_bytes configuration is set to 0x15 to count=0A=
all the local event types. The event configuration settings are domain=0A=
specific. Changing the configuration on one CPU in a domain would=0A=
affect the whole domain.=0A=
=0A=
For example:=0A=
    $cat /sys/fs/resctrl/info/L3_MON/mbm_local_config=0A=
    0=3D0x15;1=3D0x15;2=3D0x15;3=3D0x15=0A=
=0A=
    In this case the event mbm_local_bytes is currently configured with=0A=
    0x15 on domains 0 to 3.=0A=
=0A=
Signed-off-by: Babu Moger <babu.moger@amd.com>=0A=
---=0A=
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |   20 ++++++++++++++++++++=0A=
 1 file changed, 20 insertions(+)=0A=
=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r=
esctrl/rdtgroup.c=0A=
index 0982845594d0..305fb0475970 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
@@ -1484,6 +1484,16 @@ static int mbm_total_config_show(struct kernfs_open_=
file *of,=0A=
 	return 0;=0A=
 }=0A=
 =0A=
+static int mbm_local_config_show(struct kernfs_open_file *of,=0A=
+				 struct seq_file *seq, void *v)=0A=
+{=0A=
+	struct rdt_resource *r =3D of->kn->parent->priv;=0A=
+=0A=
+	mbm_config_show(seq, r, QOS_L3_MBM_LOCAL_EVENT_ID);=0A=
+=0A=
+	return 0;=0A=
+}=0A=
+=0A=
 /* rdtgroup information files for one cache resource. */=0A=
 static struct rftype res_common_files[] =3D {=0A=
 	{=0A=
@@ -1588,6 +1598,12 @@ static struct rftype res_common_files[] =3D {=0A=
 		.kf_ops		=3D &rdtgroup_kf_single_ops,=0A=
 		.seq_show	=3D mbm_total_config_show,=0A=
 	},=0A=
+	{=0A=
+		.name		=3D "mbm_local_config",=0A=
+		.mode		=3D 0644,=0A=
+		.kf_ops		=3D &rdtgroup_kf_single_ops,=0A=
+		.seq_show	=3D mbm_local_config_show,=0A=
+	},=0A=
 	{=0A=
 		.name		=3D "cpus",=0A=
 		.mode		=3D 0644,=0A=
@@ -1701,6 +1717,10 @@ void __init mbm_config_rftype_init(void)=0A=
 	rft =3D rdtgroup_get_rftype_by_name("mbm_total_config");=0A=
 	if (rft)=0A=
 		rft->fflags =3D RF_MON_INFO | RFTYPE_RES_CACHE;=0A=
+=0A=
+	rft =3D rdtgroup_get_rftype_by_name("mbm_local_config");=0A=
+	if (rft)=0A=
+		rft->fflags =3D RF_MON_INFO | RFTYPE_RES_CACHE;=0A=
 }=0A=
 =0A=
 /**=0A=
=0A=