From nobody Sun Dec 14 06:18:52 2025 Received: from NAM12-DM6-obe.outbound.protection.outlook.com (mail-dm6nam12on2045.outbound.protection.outlook.com [40.107.243.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 62AFC293725; Thu, 15 May 2025 22:53:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.243.45 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747349636; cv=fail; b=ERCeK/Qz8OFj9cIrMt5StWxoGleyK6O+ucCRFhwidDcplP0zdUzryJ2/6XVqszA3mYTT7Xhvo61Mplvtw7NQ+1HQaiz1aD/v9auUwYL1Lvls3vzRuN2WDQKIbSYmkI1rbQd3J6u48N0bgwRb32SJnBpM490kpi4PUK3NnsnMsc8= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747349636; c=relaxed/simple; bh=tF/J9L8tzhpjpQZZqDo7R+/Z78ikF2AeLRRdMpLKZNU=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=YRTmRI0lmQk6jvPBHLVC1QelUOyPT8GEg8rNDgyk44jWYvHAicn1KwBg3jb4lsGSsvZldi/zIZa6lthkgXNphf1VRuj4UiUQB6aLBB5mYVuocqdUcijmYuqkfmzPpTd7aJN2dxt+6L9Ldz2NUsfrYRaPJxyU/1Oq3ETgAtx7HaU= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=qaiwAeb2; arc=fail smtp.client-ip=40.107.243.45 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="qaiwAeb2" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=O7YKuuh2EkkhMjrTc9Etc0/D6FGohch7MsOwSpznpJcStiwSfZXjrBMy7zopEpJ3KE7WuMw1pv7zWNAHdMGdnfKWJT2zc4mjV3uQHH4eqI3Km92v790YFtyd7SHCcaEpSNAtE3OJLN18ZIeTYCe27QgYCyNGIxWHqpym8pfVjc6mYHOu48dUXgK5r3O6Vnp7p00l+XbciSyyJJGhS+JTtORHK8KckMx0xsrolI4HNarWHF7ppG72Fpgc/jVht4emcUWO99JKyFhxJGf0Sw/4q5RYHE5CYGwPoOFvGrpqDzwSo4MCva5EbIVYZEMD3Ym6yaCfRFU50KAvmGXF+j1iJA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=211ip/OWPS/dFpl9CAynwjK1FupVsst57iYzL5gRdTo=; b=VZW7/qVQ0wIoxEjtVCOHKdLWIs6PXTQjNwzpKHI5RFduqDJ4TPW164ebyV9PfQBT1Z3bXdjbiNTzxnXP+EkQ2QDshXQHDHxcEjoHAQyjJWNeCYmp5KNsxLa5BAYb5/3sO9QcsruaW1HaOrB6/zzGG5e9usfMXmRd3us3Qqqyn0iwAXcUkEwX6rjs8rFTlQcSgyuf9JRss+RKGCN0R0cNi0rvPhxC7thZDbSZ0lHcpcE7BIl7AzYpq+6Z5eD/w+GoMiXOh5c6291k+g5DRjAXjk+4V9AXOF7ao9Sywfv77OKHMIFFAwI5JvIo4lFxQD3DCT2Wmy8fHBnyUUSkP8jIWg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=lwn.net smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=211ip/OWPS/dFpl9CAynwjK1FupVsst57iYzL5gRdTo=; b=qaiwAeb2XsWCZ/Iz8+hE9YYpFw8bLe86XTWYjMhTbQ7Z1z56lnqhohAlg6Vjk2+rYEcYPY9ONVPSLmHfiA2QNNO4L7pLjOapBDAgLbxaFBBSdtYlOcRkJiKYOp8e6FZzmpEj02iLPEBWSGUCri6KHfiLgCFpFrNiM6tXz4m36Ws= Received: from BN8PR12CA0019.namprd12.prod.outlook.com (2603:10b6:408:60::32) by SJ0PR12MB8140.namprd12.prod.outlook.com (2603:10b6:a03:4e3::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8722.29; Thu, 15 May 2025 22:53:49 +0000 Received: from BN2PEPF000044A3.namprd02.prod.outlook.com (2603:10b6:408:60:cafe::70) by BN8PR12CA0019.outlook.office365.com (2603:10b6:408:60::32) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8699.33 via Frontend Transport; Thu, 15 May 2025 22:53:49 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; 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 Received: from SATLEXMB04.amd.com (165.204.84.17) by BN2PEPF000044A3.mail.protection.outlook.com (10.167.243.154) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8722.18 via Frontend Transport; Thu, 15 May 2025 22:53:48 +0000 Received: from bmoger-ubuntu.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Thu, 15 May 2025 17:53:44 -0500 From: Babu Moger To: , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v13 09/27] x86/resctrl: Introduce interface to display number of free MBM counters Date: Thu, 15 May 2025 17:51:54 -0500 Message-ID: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: BN2PEPF000044A3:EE_|SJ0PR12MB8140:EE_ X-MS-Office365-Filtering-Correlation-Id: dc8afa50-37ea-4b38-ae01-08dd94035ad1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|1800799024|376014|7416014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?IlEvQnHCSMnptKuO/+9xQVgpk0DJRF98d0qTroz+Tl4yKWnTfiBrF1rQq0Gu?= =?us-ascii?Q?SWDLZ08qTeZnHzm70gFID6KA7zgS2jukIqaUXoChSx/hKs6KnPDgGTp5AHVS?= =?us-ascii?Q?tPjqxlgp2VP8HXJLBozn0Q8A6Tck5tUvtqdLfcpJZiMGoFUnlChoy0u6quEA?= =?us-ascii?Q?lN9cE1vE0CVm78pndji3/aQkYoH/KFmd80VYVhppcTP60ZrYYu+dg58zs3fk?= =?us-ascii?Q?B/FMeBZbzLgk4I3rcnQ0ppNfsgB0aCah0VPt7YvjCpZNyKWTxGOm9ku7+OdD?= =?us-ascii?Q?BzTtsu1tXiM1HkjuzVfo/nAmkGk1NS2+0T9MUFJHv8+dbIx/6GcmE+PyG4ui?= =?us-ascii?Q?vfS1FsuSRgnGA0YDsaMqGzDA/C1/SDYMK9QgzYAt5OIgmP9WX4BTBDG9YlzO?= =?us-ascii?Q?2mqMNKBgeGJGgbVOroC6GeTmJZbltvnZMEkUCWNGaJxkVDR9Y4x8fVaBP9cP?= =?us-ascii?Q?oUZS0JiYktonD3KlxFx2BygyWhpWvyaRRemdodLscCuWE3Y2I12tyNzmPjxI?= =?us-ascii?Q?RAI8eARvUphKgF9QSPsnxXA77dEamF8LW6Wk3CK5h1tri84JJ4ATvhKrDX4A?= =?us-ascii?Q?3fZ2DWqIWtBzdoy6PsDMA70QFASrdAG5UPHBXgUZQ1K0Khkinftd9x1edfoX?= =?us-ascii?Q?naGNKbnqVVH7COW53QaPtK1aKfx0PD00iRTScDeJ7Vpaf1lTjljn4lP1Xwze?= =?us-ascii?Q?HAadkaNds3oIe+MSmKQx7kE9siALruLFFYCmEdiGXJQwSPLmuqdpgwC05DgP?= =?us-ascii?Q?vBx/NL/tYWcYBaq3gnRRuG96grPhpSzFU1k25KwmHt8mg1MPu1XnXu8vPUQK?= =?us-ascii?Q?3ZzgSufXWc5WKhSOE+GJqs4DLgcuNKbL+FEYi+SZ4Y7QDKNX/joNoMJU21+r?= =?us-ascii?Q?x9ryjlc4tc2fOwKVV0UfzrpONEeinOgL/TCzCB02Kb39VYfVLHkED1iIGUPh?= =?us-ascii?Q?+/1Myd8oPcRHyueWG/GtAB81qdd+EhAe+agrzzcfskizh9+lfh+RasUe9wXl?= =?us-ascii?Q?mLBCApq/1lt4xQ2NTb6Gy5bfZiH1Ga77fT8QvoP5fWWUMB0m8HC4GKWq5zQI?= =?us-ascii?Q?gLGLHwm9xbIuM1DZlGHnAZg2f1nBYgzcWRxxQvA3LJvhSqj03+amUnewHMW6?= =?us-ascii?Q?vFzmdpBO9k6GK086Fw9D4NVaDLv3nYbW27H1bfrlZPe4iXXl4WVnqghkbSvj?= =?us-ascii?Q?zSSHjpLPQMv8nLmA6o7BgLmKWEgMYbN/TUKf3gB+izlPPTwvnY4tDpZhg/3r?= =?us-ascii?Q?SQx3HVxFFncwgC7u3D43PxZnlu3eBA1Cze/qggDoCzLKPG2r1w+yJGzQDgss?= =?us-ascii?Q?PdAVagpR4Q5wiY2dFqm9UzZ+KjxPxv/CjjUTIw+e4Xy+eYALyPwmvxhflNZ9?= =?us-ascii?Q?QnLfxXWlGAMA2QwRag9nxhtEUtnCns3qavd3Vn+BfjbTwCMHIZAlXuRNTDdR?= =?us-ascii?Q?CLsx8laPcfSt/On/ld8RXRAsTXMnX/smdLN2tIOruzqDcvcIfaDKTf80cb+s?= =?us-ascii?Q?+19NSZZApatYdZUBTLnIfGLHSSdEz2WSyYoTJztLiPCVuEy8C1lh0fJgHQ?= =?us-ascii?Q?=3D=3D?= 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:(13230040)(82310400026)(36860700013)(1800799024)(376014)(7416014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 May 2025 22:53:48.5552 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: dc8afa50-37ea-4b38-ae01-08dd94035ad1 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: BN2PEPF000044A3.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB8140 Content-Type: text/plain; charset="utf-8" Provide the interface to display the number of monitoring counters available for assignment in each domain when mbm_cntr_assign mode is enabled. Signed-off-by: Babu Moger --- v13: Resolved conflicts caused by the recent FS/ARCH code restructure. The files monitor.c and rdtgroup.c file has now been split between the FS and ARCH directories. v12: Minor change to change log. Updated the documentation text with an example. Replaced seq_puts(s, ";") with seq_putc(s, ';'); Added missing rdt_last_cmd_clear() in resctrl_available_mbm_cntrs_show= (). v11: Rename rdtgroup_available_mbm_cntrs_show() to resctrl_available_mbm_cn= trs_show(). Few minor text changes. v10: Patch changed to handle the counters at domain level. https://lore.kernel.org/lkml/CALPaoCj+zWq1vkHVbXYP0znJbe6Ke3PXPWjtri5A= FgD9cQDCUg@mail.gmail.com/ So, display logic also changed now. v9: New patch --- Documentation/filesystems/resctrl.rst | 11 ++++++ fs/resctrl/monitor.c | 5 ++- fs/resctrl/rdtgroup.c | 48 +++++++++++++++++++++++++++ 3 files changed, 63 insertions(+), 1 deletion(-) diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesyst= ems/resctrl.rst index abbbbdf61062..2bfad43aac9c 100644 --- a/Documentation/filesystems/resctrl.rst +++ b/Documentation/filesystems/resctrl.rst @@ -295,6 +295,17 @@ with the following files: # cat /sys/fs/resctrl/info/L3_MON/num_mbm_cntrs 0=3D32;1=3D32 =20 +"available_mbm_cntrs": + The number of monitoring counters available for assignment in each + domain when mbm_cntr_assign mode is enabled on the system. + + For example, on a system with 30 available [hardware] monitoring counters + in each of its L3 domains: + :: + + # cat /sys/fs/resctrl/info/L3_MON/available_mbm_cntrs + 0=3D30;1=3D30 + "max_threshold_occupancy": Read/write file provides the largest value (in bytes) at which a previously used LLC_occupancy diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c index 039516cf410d..2548aee0151c 100644 --- a/fs/resctrl/monitor.c +++ b/fs/resctrl/monitor.c @@ -918,9 +918,12 @@ int resctrl_mon_resource_init(void) else if (resctrl_arch_is_mbm_total_enabled()) mba_mbps_default_event =3D QOS_L3_MBM_TOTAL_EVENT_ID; =20 - if (r->mon.mbm_cntr_assignable) + if (r->mon.mbm_cntr_assignable) { resctrl_file_fflags_init("num_mbm_cntrs", RFTYPE_MON_INFO | RFTYPE_RES_CACHE); + resctrl_file_fflags_init("available_mbm_cntrs", + RFTYPE_MON_INFO | RFTYPE_RES_CACHE); + } =20 return 0; } diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c index e2005fc9acd9..752750e3e443 100644 --- a/fs/resctrl/rdtgroup.c +++ b/fs/resctrl/rdtgroup.c @@ -1855,6 +1855,48 @@ static int resctrl_num_mbm_cntrs_show(struct kernfs_= open_file *of, return 0; } =20 +static int resctrl_available_mbm_cntrs_show(struct kernfs_open_file *of, + struct seq_file *s, void *v) +{ + struct rdt_resource *r =3D rdt_kn_parent_priv(of->kn); + struct rdt_mon_domain *dom; + bool sep =3D false; + u32 cntrs, i; + int ret =3D 0; + + cpus_read_lock(); + mutex_lock(&rdtgroup_mutex); + + rdt_last_cmd_clear(); + + if (!resctrl_arch_mbm_cntr_assign_enabled(r)) { + rdt_last_cmd_puts("mbm_cntr_assign mode is not enabled\n"); + ret =3D -EINVAL; + goto unlock_cntrs_show; + } + + list_for_each_entry(dom, &r->mon_domains, hdr.list) { + if (sep) + seq_putc(s, ';'); + + cntrs =3D 0; + for (i =3D 0; i < r->mon.num_mbm_cntrs; i++) { + if (!dom->cntr_cfg[i].rdtgrp) + cntrs++; + } + + seq_printf(s, "%d=3D%u", dom->hdr.id, cntrs); + sep =3D true; + } + seq_putc(s, '\n'); + +unlock_cntrs_show: + mutex_unlock(&rdtgroup_mutex); + cpus_read_unlock(); + + return ret; +} + /* rdtgroup information files for one cache resource. */ static struct rftype res_common_files[] =3D { { @@ -1878,6 +1920,12 @@ static struct rftype res_common_files[] =3D { .seq_show =3D rdt_mon_features_show, .fflags =3D RFTYPE_MON_INFO, }, + { + .name =3D "available_mbm_cntrs", + .mode =3D 0444, + .kf_ops =3D &rdtgroup_kf_single_ops, + .seq_show =3D resctrl_available_mbm_cntrs_show, + }, { .name =3D "num_rmids", .mode =3D 0444, --=20 2.34.1