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Subject: [PATCH v2 06/10] x86/resctrl: Introduce mon_configurable to detect
 Bandwidth Monitoring Event Configuration
From:   Babu Moger <babu.moger@amd.com>
To:     <fenghua.yu@intel.com>, <reinette.chatre@intel.com>,
        <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>
CC:     <eranian@google.com>, <dave.hansen@linux.intel.com>,
        <x86@kernel.org>, <hpa@zytor.com>, <corbet@lwn.net>,
        <hpa@zytor.com>, <linux-kernel@vger.kernel.org>,
        <linux-doc@vger.kernel.org>
Date:   Mon, 1 Aug 2022 15:56:18 -0500
Message-ID: <165938737828.724959.2910385805798358887.stgit@bmoger-ubuntu>
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Newer AMD processors support the new feature Bandwidth Monitoring Event=0A=
Configuration (BMEC). The events mbm_total_bytes and mbm_local_bytes=0A=
are configurable when this feature is present.=0A=
=0A=
Set mon_configurable if the feature is available.=0A=
=0A=
Signed-off-by: Babu Moger <babu.moger@amd.com>=0A=
---=0A=
 arch/x86/kernel/cpu/resctrl/monitor.c  |   14 ++++++++++++++=0A=
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |   17 +++++++++++++++++=0A=
 include/linux/resctrl.h                |    1 +=0A=
 3 files changed, 32 insertions(+)=0A=
=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/re=
sctrl/monitor.c=0A=
index eaf25a234ff5..b9de417dac1c 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/monitor.c=0A=
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c=0A=
@@ -682,6 +682,16 @@ static void l3_mon_evt_init(struct rdt_resource *r)=0A=
 		list_add_tail(&mbm_local_event.list, &r->evt_list);=0A=
 }=0A=
 =0A=
+=0A=
+void __rdt_get_mon_l3_config_amd(struct rdt_resource *r)=0A=
+{=0A=
+	/*=0A=
+	 * Check if CPU supports the Bandwidth Monitoring Event Configuration=0A=
+	 */=0A=
+	if (boot_cpu_has(X86_FEATURE_BMEC))=0A=
+		r->mon_configurable =3D true;=0A=
+}=0A=
+=0A=
 int rdt_get_mon_l3_config(struct rdt_resource *r)=0A=
 {=0A=
 	unsigned int mbm_offset =3D boot_cpu_data.x86_cache_mbm_width_offset;=0A=
@@ -714,6 +724,10 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)=0A=
 	if (ret)=0A=
 		return ret;=0A=
 =0A=
+	if (boot_cpu_data.x86_vendor =3D=3D X86_VENDOR_AMD)=0A=
+		__rdt_get_mon_l3_config_amd(r);=0A=
+=0A=
+=0A=
 	l3_mon_evt_init(r);=0A=
 =0A=
 	r->mon_capable =3D true;=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r=
esctrl/rdtgroup.c=0A=
index fc5286067201..855483b297a8 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
@@ -995,6 +995,16 @@ static int rdt_num_rmids_show(struct kernfs_open_file =
*of,=0A=
 	return 0;=0A=
 }=0A=
 =0A=
+static int rdt_mon_configurable_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=
+	seq_printf(seq, "%d\n", r->mon_configurable);=0A=
+=0A=
+	return 0;=0A=
+}=0A=
+=0A=
 static int rdt_mon_features_show(struct kernfs_open_file *of,=0A=
 				 struct seq_file *seq, void *v)=0A=
 {=0A=
@@ -1447,6 +1457,13 @@ static struct rftype res_common_files[] =3D {=0A=
 		.seq_show	=3D rdt_num_rmids_show,=0A=
 		.fflags		=3D RF_MON_INFO,=0A=
 	},=0A=
+	{=0A=
+		.name		=3D "mon_configurable",=0A=
+		.mode		=3D 0444,=0A=
+		.kf_ops		=3D &rdtgroup_kf_single_ops,=0A=
+		.seq_show	=3D rdt_mon_configurable_show,=0A=
+		.fflags		=3D RF_MON_INFO,=0A=
+	},=0A=
 	{=0A=
 		.name		=3D "cbm_mask",=0A=
 		.mode		=3D 0444,=0A=
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h=0A=
index 21deb5212bbd..4ee2b606ac14 100644=0A=
--- a/include/linux/resctrl.h=0A=
+++ b/include/linux/resctrl.h=0A=
@@ -154,6 +154,7 @@ struct rdt_resource {=0A=
 	bool			mon_enabled;=0A=
 	bool			alloc_capable;=0A=
 	bool			mon_capable;=0A=
+	bool			mon_configurable;=0A=
 	int			num_rmid;=0A=
 	int			cache_level;=0A=
 	struct resctrl_cache	cache;=0A=
=0A=