linux-kernel - [PATCH v3 08/10] x86/resctrl: Add the sysfs interface to read the event configuration

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Message-ID: <166117586269.6695.16560984025494646306.stgit@bmoger-ubuntu>
Date:   Mon, 22 Aug 2022 08:44:22 -0500
From:   Babu Moger <babu.moger@....com>
To:     <fenghua.yu@...el.com>, <reinette.chatre@...el.com>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>
CC:     <eranian@...gle.com>, <dave.hansen@...ux.intel.com>,
        <x86@...nel.org>, <hpa@...or.com>, <corbet@....net>,
        <hpa@...or.com>, <linux-kernel@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <bagasdotme@...il.com>
Subject: [PATCH v3 08/10] x86/resctrl: Add the sysfs interface to read the
 event configuration

The current event configuration can be viewed by the user by reading
the sysfs configuration file.

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_total_bytes configuration is set to 0x7f to count
all the types of events and mbm_local_bytes configuration is set to
0x15 to count all the local memory events.

$cat /sys/fs/resctrl/mon_data/mon_L3_00/mbm_total_config
0x7f

$cat /sys/fs/resctrl/mon_data/mon_L3_00/mbm_local_config
0x15

Signed-off-by: Babu Moger <babu.moger@....com>
Reviewed-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/resctrl/internal.h |   21 ++++++++++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |   70 ++++++++++++++++++++++++++++++++
 2 files changed, 91 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index fc725f5e9024..457666709386 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -15,6 +15,7 @@
 #define MSR_IA32_MBA_THRTL_BASE		0xd50
 #define MSR_IA32_MBA_BW_BASE		0xc0000200
 #define MSR_IA32_SMBA_BW_BASE		0xc0000280
+#define MSR_IA32_EVT_CFG_BASE		0xc0000400
 
 #define MSR_IA32_QM_CTR			0x0c8e
 #define MSR_IA32_QM_EVTSEL		0x0c8d
@@ -50,6 +51,26 @@
  */
 #define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)
 
+/* Reads to Local DRAM Memory */
+#define READS_TO_LOCAL_MEM		BIT(0)
+
+/* Reads to Remote DRAM Memory */
+#define READS_TO_REMOTE_MEM		BIT(1)
+
+/* Non-Temporal Writes to Local Memory */
+#define NON_TEMP_WRITE_TO_LOCAL_MEM	BIT(2)
+
+/* Non-Temporal Writes to Remote Memory */
+#define NON_TEMP_WRITE_TO_REMOTE_MEM	BIT(3)
+
+/* Reads to Local Memory the system identiﬁes as "Slow Memory" */
+#define READS_TO_LOCAL_S_MEM		BIT(4)
+
+/* Reads to Remote Memory the system identiﬁes as "Slow Memory" */
+#define READS_TO_REMOTE_S_MEM		BIT(5)
+
+/* Dirty Victims to All Types of Memory */
+#define  DIRTY_VICTIS_TO_ALL_MEM	BIT(6)
 
 struct rdt_fs_context {
 	struct kernfs_fs_context	kfc;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 30d2182d4fda..e1847d49fa15 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -254,8 +254,78 @@ static const struct kernfs_ops kf_mondata_ops = {
 	.seq_show		= rdtgroup_mondata_show,
 };
 
+/*
+ * This is called via IPI to read the CQM/MBM counters
+ * in a domain.
+ */
+void mon_event_config_read(void *info)
+{
+	union mon_data_bits *md = info;
+	u32 evtid = md->u.evtid;
+	u32 h, msr_index;
+
+	switch (evtid) {
+	case QOS_L3_MBM_TOTAL_EVENT_ID:
+		msr_index = 0;
+		break;
+	case QOS_L3_MBM_LOCAL_EVENT_ID:
+		msr_index = 1;
+		break;
+	default:
+		return; /* Not expected to come here */
+	}
+
+	rdmsr(MSR_IA32_EVT_CFG_BASE + msr_index, md->u.mon_config, h);
+}
+
+void mondata_config_read(struct rdt_domain *d, union mon_data_bits *md)
+{
+	smp_call_function_any(&d->cpu_mask, mon_event_config_read, md, 1);
+}
+
+int rdtgroup_mondata_config_show(struct seq_file *m, void *arg)
+{
+	struct kernfs_open_file *of = m->private;
+	struct rdt_hw_resource *hw_res;
+	u32 resid, evtid, domid;
+	struct rdtgroup *rdtgrp;
+	struct rdt_resource *r;
+	union mon_data_bits md;
+	struct rdt_domain *d;
+	int ret = 0;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	md.priv = of->kn->priv;
+	resid = md.u.rid;
+	domid = md.u.domid;
+	evtid = md.u.evtid;
+
+	hw_res = &rdt_resources_all[resid];
+	r = &hw_res->r_resctrl;
+
+	d = rdt_find_domain(r, domid, NULL);
+	if (IS_ERR_OR_NULL(d)) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	mondata_config_read(d, &md);
+
+	seq_printf(m, "0x%x\n", md.u.mon_config);
+
+out:
+	rdtgroup_kn_unlock(of->kn);
+	return ret;
+}
+
 static const struct kernfs_ops kf_mondata_config_ops = {
 	.atomic_write_len       = PAGE_SIZE,
+	.seq_show               = rdtgroup_mondata_config_show,
 };
 
 static bool is_cpu_list(struct kernfs_open_file *of)