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Thu, 22 Dec 2022 17:31:54 -0600 From: Babu Moger To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v10 12/13] x86/resctrl: Add interface to write mbm_local_bytes_config Date: Thu, 22 Dec 2022 17:31:26 -0600 Message-ID: <20221222233127.910538-13-babu.moger@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221222233127.910538-1-babu.moger@amd.com> References: <20221222233127.910538-1-babu.moger@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000C977:EE_|DS7PR12MB8273:EE_ X-MS-Office365-Filtering-Correlation-Id: 70333f94-2314-4157-0fc3-08dae474b760 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230022)(4636009)(396003)(376002)(346002)(136003)(39860400002)(451199015)(46966006)(36840700001)(40470700004)(70586007)(4326008)(70206006)(8676002)(40460700003)(86362001)(36756003)(5660300002)(336012)(316002)(8936002)(47076005)(82310400005)(41300700001)(1076003)(16526019)(6666004)(2616005)(186003)(7696005)(83380400001)(26005)(426003)(36860700001)(356005)(40480700001)(81166007)(54906003)(478600001)(82740400003)(44832011)(110136005)(2906002)(7416002)(7406005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Dec 2022 23:31:56.7243 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 70333f94-2314-4157-0fc3-08dae474b760 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: CY4PEPF0000C977.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB8273 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 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: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1752959268767926379?= X-GMAIL-MSGID: =?utf-8?q?1752959268767926379?= The event configuration for mbm_local_bytes can be changed by the user by writing to the configuration file /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config. The event configuration settings are domain specific and will affect all the CPUs in the domain. 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 ==== =========================================================== For example: To change the mbm_local_bytes_config to count all the non-temporal writes on domain 0, the bits 2 and 3 needs to be set which is 1100b (in hex 0xc). Run the command. $echo 0=0xc > /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config To change the mbm_local_bytes to count only reads to local NUMA domain 1, the bit 0 needs to be set which 1b (in hex 0x1). Run the command. $echo 1=0x1 > /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config Reviewed-by: Reinette Chatre Signed-off-by: Babu Moger --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 29 +++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c index acaf19f5d65b..59debc997162 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -1638,6 +1638,32 @@ static ssize_t mbm_total_bytes_config_write(struct kernfs_open_file *of, return ret ?: nbytes; } +static ssize_t mbm_local_bytes_config_write(struct kernfs_open_file *of, + char *buf, size_t nbytes, + loff_t off) +{ + struct rdt_resource *r = of->kn->parent->priv; + int ret; + + /* Valid input requires a trailing newline */ + if (nbytes == 0 || buf[nbytes - 1] != '\n') + return -EINVAL; + + cpus_read_lock(); + mutex_lock(&rdtgroup_mutex); + + rdt_last_cmd_clear(); + + buf[nbytes - 1] = '\0'; + + ret = mon_config_write(r, buf, QOS_L3_MBM_LOCAL_EVENT_ID); + + mutex_unlock(&rdtgroup_mutex); + cpus_read_unlock(); + + return ret ?: nbytes; +} + /* rdtgroup information files for one cache resource. */ static struct rftype res_common_files[] = { { @@ -1745,9 +1771,10 @@ static struct rftype res_common_files[] = { }, { .name = "mbm_local_bytes_config", - .mode = 0444, + .mode = 0644, .kf_ops = &rdtgroup_kf_single_ops, .seq_show = mbm_local_bytes_config_show, + .write = mbm_local_bytes_config_write, }, { .name = "cpus",