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Thu, 1 Dec 2022 09:37:23 -0600 Subject: [PATCH v9 11/13] x86/resctrl: Add sysfs interface to write mbm_local_bytes_config From: Babu Moger To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Date: Thu, 1 Dec 2022 09:37:22 -0600 Message-ID: <166990904243.17806.8875872967137007418.stgit@bmoger-ubuntu> In-Reply-To: <166990882621.17806.16780480657453071426.stgit@bmoger-ubuntu> References: <166990882621.17806.16780480657453071426.stgit@bmoger-ubuntu> User-Agent: StGit/1.1.dev103+g5369f4c MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT093:EE_|MW3PR12MB4507:EE_ X-MS-Office365-Filtering-Correlation-Id: 2d8f576c-ccd0-4981-3eb3-08dad3b1f290 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)(7916004)(136003)(396003)(376002)(346002)(39860400002)(451199015)(40470700004)(36840700001)(46966006)(81166007)(40480700001)(86362001)(356005)(103116003)(54906003)(40460700003)(110136005)(316002)(16576012)(5660300002)(33716001)(7406005)(44832011)(70586007)(8676002)(70206006)(7416002)(4326008)(478600001)(41300700001)(8936002)(36860700001)(83380400001)(82740400003)(9686003)(47076005)(2906002)(26005)(186003)(82310400005)(426003)(16526019)(336012)(71626007)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Dec 2022 15:37:25.6995 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2d8f576c-ccd0-4981-3eb3-08dad3b1f290 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: CO1NAM11FT093.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR12MB4507 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?1751026627707083687?= X-GMAIL-MSGID: =?utf-8?q?1751026627707083687?= The current 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 Signed-off-by: Babu Moger Reviewed-by: Reinette Chatre --- 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 8a22a652a6e8..6897c480ae55 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -1641,6 +1641,32 @@ 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[] = { { @@ -1748,9 +1774,10 @@ 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",