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Subject: [PATCH v4 10/13] x86/resctrl: Add the sysfs interface to read the
 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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        <sandipan.das@amd.com>, <tony.luck@intel.com>,
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Date:   Wed, 7 Sep 2022 13:01:09 -0500
Message-ID: <166257366902.1043018.16087054015308149859.stgit@bmoger-ubuntu>
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The current event configuration can be viewed by the user by reading=0A=
the sysfs configuration file.=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_total_bytes configuration is set to 0x7F to count=0A=
all the event types and the mbm_local_bytes configuration is set to=0A=
0x15 to count all the local memory events.=0A=
=0A=
$cat /sys/fs/resctrl/mon_data/mon_L3_00/mbm_total_config=0A=
0x7f=0A=
=0A=
$cat /sys/fs/resctrl/mon_data/mon_L3_00/mbm_local_config=0A=
0x15=0A=
=0A=
Signed-off-by: Babu Moger <babu.moger@amd.com>=0A=
---=0A=
 arch/x86/kernel/cpu/resctrl/internal.h |   24 ++++++++++=0A=
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |   77 ++++++++++++++++++++++++++++=
++++=0A=
 2 files changed, 101 insertions(+)=0A=
=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/r=
esctrl/internal.h=0A=
index 45923eb4022f..96f439324d78 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/internal.h=0A=
+++ b/arch/x86/kernel/cpu/resctrl/internal.h=0A=
@@ -15,6 +15,7 @@=0A=
 #define MSR_IA32_MBA_THRTL_BASE		0xd50=0A=
 #define MSR_IA32_MBA_BW_BASE		0xc0000200=0A=
 #define MSR_IA32_SMBA_BW_BASE		0xc0000280=0A=
+#define MSR_IA32_EVT_CFG_BASE		0xc0000400=0A=
 =0A=
 #define MSR_IA32_QM_CTR			0x0c8e=0A=
 #define MSR_IA32_QM_EVTSEL		0x0c8d=0A=
@@ -50,6 +51,29 @@=0A=
  */=0A=
 #define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)=0A=
 =0A=
+/* Reads to Local DRAM Memory */=0A=
+#define READS_TO_LOCAL_MEM		BIT(0)=0A=
+=0A=
+/* Reads to Remote DRAM Memory */=0A=
+#define READS_TO_REMOTE_MEM		BIT(1)=0A=
+=0A=
+/* Non-Temporal Writes to Local Memory */=0A=
+#define NON_TEMP_WRITE_TO_LOCAL_MEM	BIT(2)=0A=
+=0A=
+/* Non-Temporal Writes to Remote Memory */=0A=
+#define NON_TEMP_WRITE_TO_REMOTE_MEM	BIT(3)=0A=
+=0A=
+/* Reads to Local Memory the system identifies as "Slow Memory" */=0A=
+#define READS_TO_LOCAL_S_MEM		BIT(4)=0A=
+=0A=
+/* Reads to Remote Memory the system identifies as "Slow Memory" */=0A=
+#define READS_TO_REMOTE_S_MEM		BIT(5)=0A=
+=0A=
+/* Dirty Victims to All Types of Memory */=0A=
+#define  DIRTY_VICTIMS_TO_ALL_MEM	BIT(6)=0A=
+=0A=
+/* Max event bits supported */=0A=
+#define MAX_EVT_CONFIG_BITS		GENMASK(6, 0)=0A=
 =0A=
 struct rdt_fs_context {=0A=
 	struct kernfs_fs_context	kfc;=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r=
esctrl/rdtgroup.c=0A=
index da11fdad204d..6f067c1ac7c1 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
@@ -254,8 +254,85 @@ static const struct kernfs_ops kf_mondata_ops =3D {=0A=
 	.seq_show		=3D rdtgroup_mondata_show,=0A=
 };=0A=
 =0A=
+struct mon_config_info {=0A=
+	u32 evtid;=0A=
+	u32 mon_config;=0A=
+};=0A=
+=0A=
+/*=0A=
+ * This is called via IPI to read the CQM/MBM counters=0A=
+ * in a domain.=0A=
+ */=0A=
+void mon_event_config_read(void *info)=0A=
+{=0A=
+	struct mon_config_info *mon_info =3D info;=0A=
+	u32 h, msr_index;=0A=
+=0A=
+	switch (mon_info->evtid) {=0A=
+	case QOS_L3_MBM_TOTAL_EVENT_ID:=0A=
+		msr_index =3D 0;=0A=
+		break;=0A=
+	case QOS_L3_MBM_LOCAL_EVENT_ID:=0A=
+		msr_index =3D 1;=0A=
+		break;=0A=
+	default:=0A=
+		/* Not expected to come here */=0A=
+		return;=0A=
+	}=0A=
+=0A=
+	rdmsr(MSR_IA32_EVT_CFG_BASE + msr_index, mon_info->mon_config, h);=0A=
+}=0A=
+=0A=
+void mondata_config_read(struct rdt_domain *d, struct mon_config_info *mon=
_info)=0A=
+{=0A=
+	smp_call_function_any(&d->cpu_mask, mon_event_config_read, mon_info, 1);=
=0A=
+}=0A=
+=0A=
+int rdtgroup_mondata_config_show(struct seq_file *m, void *arg)=0A=
+{=0A=
+	struct kernfs_open_file *of =3D m->private;=0A=
+	struct mon_config_info mon_info;=0A=
+	struct rdt_hw_resource *hw_res;=0A=
+	u32 resid, evtid, domid;=0A=
+	struct rdtgroup *rdtgrp;=0A=
+	struct rdt_resource *r;=0A=
+	union mon_data_bits md;=0A=
+	struct rdt_domain *d;=0A=
+	int ret =3D 0;=0A=
+=0A=
+	rdtgrp =3D rdtgroup_kn_lock_live(of->kn);=0A=
+	if (!rdtgrp) {=0A=
+		ret =3D -ENOENT;=0A=
+		goto out;=0A=
+	}=0A=
+=0A=
+	md.priv =3D of->kn->priv;=0A=
+	resid =3D md.u.rid;=0A=
+	domid =3D md.u.domid;=0A=
+	evtid =3D md.u.evtid;=0A=
+=0A=
+	hw_res =3D &rdt_resources_all[resid];=0A=
+	r =3D &hw_res->r_resctrl;=0A=
+=0A=
+	d =3D rdt_find_domain(r, domid, NULL);=0A=
+	if (IS_ERR_OR_NULL(d)) {=0A=
+		ret =3D -ENOENT;=0A=
+		goto out;=0A=
+	}=0A=
+=0A=
+	mon_info.evtid =3D evtid;=0A=
+	mondata_config_read(d, &mon_info);=0A=
+=0A=
+	seq_printf(m, "0x%x\n", mon_info.mon_config);=0A=
+=0A=
+out:=0A=
+	rdtgroup_kn_unlock(of->kn);=0A=
+	return ret;=0A=
+}=0A=
+=0A=
 static const struct kernfs_ops kf_mondata_config_ops =3D {=0A=
 	.atomic_write_len       =3D PAGE_SIZE,=0A=
+	.seq_show               =3D rdtgroup_mondata_config_show,=0A=
 };=0A=
 =0A=
 static bool is_cpu_list(struct kernfs_open_file *of)=0A=
=0A=