Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Received-SPF: Pass (protection.outlook.com: domain of amd.com designates
 165.204.84.17 as permitted sender) receiver=protection.outlook.com;
 client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C
Subject: [PATCH v3 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>, <bagasdotme@gmail.com>
Date:   Mon, 22 Aug 2022 08:43:47 -0500
Message-ID: <166117582698.6695.3458866624522799072.stgit@bmoger-ubuntu>
In-Reply-To: <166117559756.6695.16047463526634290701.stgit@bmoger-ubuntu>
References: <166117559756.6695.16047463526634290701.stgit@bmoger-ubuntu>
User-Agent: StGit/1.1.dev103+g5369f4c
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: quoted-printable
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Aug 2022 13:43:49.2971
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 09fcd433-9293-4df8-1b3d-08da84445806
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com]
X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT017.eop-nam11.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR12MB1791
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,
        RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE
        autolearn=ham autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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=
Reviewed-by: Ingo Molnar <mingo@kernel.org>=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=