From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from BN8PR05CU002.outbound.protection.outlook.com (mail-eastus2azon11011014.outbound.protection.outlook.com [52.101.57.14]) (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 3581B371049; Mon, 12 Oct 2026 07:47:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.57.14 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791791270; cv=fail; b=t/gaPcQ5iAk6XN/tNbUwrVZNg4vOrWQDxuK8BLpZ+y9vIvar3h/u25YpG2cxtUogn3LtV459Qmsw56XASx9y1LYKtu+RNIfkL4LiZI+uG4pbzGDwlmzKw0L2KSNAR/YVuCIScuGxLwwuCW6w8NluICKLt1MYmE6hRmyBZoTWcvI= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791791270; c=relaxed/simple; bh=Np2wp8cbr86KAfvytWZ+ZNwKwPqSHxGI493sVazr59s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=N7xMcJQVZbmZgY6gz9j+bhITpPK686SsLOnoQdW2Y6DfBnzZGbAvjOwqiy5KMh5QUIZGxydC4svf9wb5XvfruUl9i6krAtQCyYncEJhukQB/F9WUjIMNMyXALSooAUf3bWvyfImb8mpuVTPCm4jKr1rvDQseFUknufyzzDpMG2g= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=d1Tt025W; arc=fail smtp.client-ip=52.101.57.14 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="d1Tt025W" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=JjkwiMt5aHMQX181H6TuOjSkrAI/f3cP8LjEo7wECQWOPXyRzWAz80NFUbIJSdlVmUKC+v04W+JA0YdjvAtfcQ1yLluP6Plsuxd+wIBLpWSgsYmYfS1wXLn2R6V+hVgfN30DMHx0oBMV1+EYfaumg4zv8QDLACr92YrIORNegHU2IpDj1Jb7ue+E+s1A4eMGrdod4mBnAibajThOH36R3K3YJGfrt0uI9MXrMAAAwYoInIJ2xK6d/NMF2V9ypyJe/8blSvwXBijQd90EIA1WAVNAd6wKya3PCMsMgltqNPkUBUC2OvEzRtrXWWJ8qf+zQ9Jy1Zws9vTsfJtjRzOCcQ== 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=SkGYpXExzQCU6JpYeL+khbPWGQlfUR4nHQdWboEWgKw=; b=wdUZGJRYVCXkdwRZNW8r7JBj59E2A3MyjYD/vyZoTx1AwRW96vUFKTmHqxcaacfwZXuUCEkPYL72gH4Us44YFvCa6bV4Glk5KrcxxKykh5Olbf+xJmARz+15yYs8U25asHhkJOqxfXerZv1An8LeAVoKxqdrtVzvd/nGDtbNd4SC4aEFRoL7EYkM51eapCIkIHuw5OMa8Pw33PIpbKUQpQ4lcJeZV1n36HY1QciRT2pUMLca5jOfoA15U9cdyhccRfPbyvIZx1W3UGc+Jm4XOc5J4w1iMnAoDfGGmbFBAs343z326Oe3o2LShEiT/wjH9mOT1BsSC4eDE+nujC6FMg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=SkGYpXExzQCU6JpYeL+khbPWGQlfUR4nHQdWboEWgKw=; b=d1Tt025Wb4lMFWOzFGPqrj+b5EIsDpS8coVBkW9CMEJzn5+35qa6aopoN0ORJqWfRKklsH6wyPb5cWUqkKTsy/MTwloMer9asc/k8WiXMx98kw6vgRdIL8e5GPvXMlj9NBFuxFr8zw4R6yZsvr/FP2a/ZEEfmXr67CuL8U/Es3XFwY+NzprObeCiJs6cgO8OkBlL3VKFDo3FQ4LxVjUFYSBb4icKVC/MCAfQkjv8pAZpTHStAc3oDhSMRGhcOo1zEZ5yBJQcW1yFAaAFNAdsqyYQhDYTaVspU5zHoPu/6VmJ+KOfp6AzYlar6GuBKlDyZ5D2W19e15VuBU5XBWKoig== Authentication-Results: mx.microsoft.com 1; dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from BL0PR12MB2370.namprd12.prod.outlook.com (2603:10b6:207:47::27) by CY1PR12MB9700.namprd12.prod.outlook.com (2603:10b6:930:108::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.496.21; Mon, 12 Oct 2026 07:47:45 +0000 Received: from BL0PR12MB2370.namprd12.prod.outlook.com ([fe80::86cf:c3ec:2cf5:74c8]) by BL0PR12MB2370.namprd12.prod.outlook.com ([fe80::86cf:c3ec:2cf5:74c8%5]) with mapi id 15.21.0496.020; Mon, 12 Oct 2026 07:47:45 +0000 From: Richard Cheng To: tony.luck@intel.com, reinette.chatre@intel.com, x86@kernel.org, shuah@kernel.org, fenghuay@nvidia.com Cc: Dave.Martin@arm.com, james.morse@arm.com, babu.moger@amd.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kaihengf@nvidia.com, kobak@nvidia.com, newtonl@nvidia.com, kristinc@nvidia.com, Richard Cheng Subject: [PATCH v5 1/2] selftests/resctrl: Implement cl_flush() and sb() for aarch64 Date: Mon, 12 Oct 2026 15:47:28 +0800 Message-ID: <20261012074729.40042-2-icheng@nvidia.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20261012074729.40042-1-icheng@nvidia.com> References: <20261012074729.40042-1-icheng@nvidia.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SI2PR02CA0040.apcprd02.prod.outlook.com (2603:1096:4:196::6) To BL0PR12MB2370.namprd12.prod.outlook.com (2603:10b6:207:47::27) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL0PR12MB2370:EE_|CY1PR12MB9700:EE_ X-MS-Office365-Filtering-Correlation-Id: 0c0a6237-45da-411c-09a9-08df28351a4e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|1800799024|376014|366016|6133799003|10067099003|22082099003|18002099003|11063799006|261009223027099003|56012099006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BL0PR12MB2370.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(23010399003)(1800799024)(376014)(366016)(6133799003)(10067099003)(22082099003)(18002099003)(11063799006)(261009223027099003)(56012099006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?C88IQwCWmLwYDTcjXhsC+3wJMyllGSzLHfEJuUMrFj0TVcBJ0/9nTAyy1i+I?= =?us-ascii?Q?Uj29aFmGS/QO8ZfAD9MKTKmryodCRV+GWky0PSyvWLl36dXn6t2IWP5VvTWJ?= =?us-ascii?Q?j4GfGqY3zl/Nz4HLIEGKQhdwaSN52B6bQ0DKl3Z1Feu1rpFHlxUetbo5aV8f?= =?us-ascii?Q?q3JIr9frN+TMG2118Knkdqiuc63RSaH82QqsqZ66DDMSG0SJeO9nieoKvcN9?= =?us-ascii?Q?7uD34f8viPtGRlZoUlMWzJeKi/F1mD3HCjs8dahu1tIzBBzSniJo6kaAsdWr?= =?us-ascii?Q?0/uXCzUIVRVhI1Bb//aU9A4TLmURoXB9x3BhP/vEQypmhXjgPv0IUfhwDoG/?= =?us-ascii?Q?dyxw+zFDZ8ygFd8KbTkcf6N+BYs1+pqe1oDr5q/alx72+aNqkjj1cn8tNtjI?= =?us-ascii?Q?+FunlHahIsXLTldRnH5788bT/gtgKD+l9qngCi1b3Hc1JMdD+ho50dtNDVYr?= =?us-ascii?Q?X9Va2G8G6wrzYX/tf1XNrZ3mROUOo99LvKx7omlfeDBNng2bjGtnXIL5WM/o?= =?us-ascii?Q?DYt6YnENVGTshFDKae7h+V1IGI/uhvdAVBPXj9fUA2UwfWJpnhS9Mo25EAD5?= =?us-ascii?Q?JSRkAzTpblJJupBG1gwPQ3VEsbSJNlf++qzwhq9lJa7Nj2Vr/JqrG2fqdcJa?= =?us-ascii?Q?9h6xU2L6L6OwK1rMFNdAreMKE2RAH/4Xf/LT3jehkhPpBdLeVdjv3IO67E4w?= =?us-ascii?Q?U3M1SKuBrqvfOlAVAFZN1XiJYn2SR4jxvkNHlRN89KRZ13HZZ6gQ+GILlhfV?= =?us-ascii?Q?viz8D5NshlAHmt798dWjMEgruZTc3WUqSs9cPo6CvR0MMqArLXtvD1aBc01J?= =?us-ascii?Q?QSMryM2g4kDLhu5j33O2KvlHJmaGCIVDWZPUGTHmBkdFSqMePKaX+KtIJdgT?= =?us-ascii?Q?M0hED/5aTpDqbrTO9A6IwCQsUQy2w1cbNRr06Eb6NfZjfJnppm+7LToCae8s?= =?us-ascii?Q?ASBApJaJMc65ItQXq8sAzk0dUnplx5HKBsoMlMR22Q86yfSj2c2alBf1nEQu?= =?us-ascii?Q?m6Y1b1atEigZUAjRBk+ZM/l4zxd3nwx+KF8l2gZ5FWZ6WhMsNt55TqMrR/iS?= =?us-ascii?Q?EklxKT2/LQlKvDXQ3v+gx6+wSvl4BBZ14D0KFithvz36VxAqRQ2S8DNuqf+R?= =?us-ascii?Q?gF/MKce7+sGxtmD60K1dnoM1iHu349whAtUbslKn1wopLlhPS9rojl15vCgb?= =?us-ascii?Q?Ar33NDOqTbj+D0+7Vt97hbCB4vl9Z9sVW8TNWaKHYOX0hbszQITHjVXSAfxW?= =?us-ascii?Q?237jw2Ez7uaIJxtEaRKz+y4xHe3rzGy9DkuxK4hpWvjQYfg6GM3pCaToy+hA?= =?us-ascii?Q?4vJ4IQhvAZQTdF0a3Rt8l8JUrHMgbeR2sq1re9jCZdb0G8WlGGIjeG1ca/ii?= =?us-ascii?Q?QlERAE2d20fDQjl9SY8Pfbf41M33UTM+MLEyI/+Am55XzJJdAgNz3m3hDVac?= =?us-ascii?Q?8QZ7PaHSZ0rz/2bxpInrCNAUWB33pbZQkGOBXGe22m6Riu9zj5BkwCgfwEMQ?= =?us-ascii?Q?FTZ/9m4I4NKvJYTTjVvO/K5+Kf03LNHFVdCDwfOIGQ2u3TQnOfQxPLtfE/q9?= =?us-ascii?Q?brX/uRPca02SpZs+/csrLRDUbJJCQFTgkv+tt38NgTfOdjixvs4JCf53CzMW?= =?us-ascii?Q?q2QkgQNzmtE7M281b9JGUPqq+VB2o8EHr9jgZEz1wLBLYpDz9B1Q1qMaiqk7?= =?us-ascii?Q?wOlmNmkUydVOQkDt0blQEgo4Rg+b9Dj8zviQliETvc6Q2RaxpcKcW5PdwRns?= =?us-ascii?Q?WJ8mVCaJ9A=3D=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0c0a6237-45da-411c-09a9-08df28351a4e X-MS-Exchange-CrossTenant-AuthSource: BL0PR12MB2370.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Oct 2026 07:47:45.2886 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 9OJ2lzIb1E8JCmU3thBkMyCopjvga2/pgY75NCz5j50eR/1QReM8Pq44O97agJ4DqOrejT98K8wF+VZLj3no2g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY1PR12MB9700 cl_flush() and sb() compile to empty functions on aarch64, making mem_flush() a silent no-op and leaving CMT/CAT tests operating on unflushed state. Add "dsb sy" for sb(), ARM requires a DSB whose access type covers both loads and stores. For cl_flush(), "dc civac" only reaches the Point of Coherency, on ARM MPAM systems the SLC lies past the PoC and may be a NOP on coherent platforms. Instead, dirty each cacheline with a store so that mem_flush's full-buffer sweep evicts lines from the SLC via LRU pressure. Signed-off-by: Richard Cheng --- tools/testing/selftests/resctrl/fill_buf.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c index b9fa7968cd6e..eae0262fe265 100644 --- a/tools/testing/selftests/resctrl/fill_buf.c +++ b/tools/testing/selftests/resctrl/fill_buf.c @@ -27,6 +27,9 @@ static void sb(void) #if defined(__i386) || defined(__x86_64) asm volatile("sfence\n\t" : : : "memory"); +#elif defined(__aarch64__) + asm volatile("dsb sy\n\t" + : : : "memory"); #endif } @@ -35,6 +38,14 @@ static void cl_flush(void *p) #if defined(__i386) || defined(__x86_64) asm volatile("clflush (%0)\n\t" : : "r"(p) : "memory"); +#elif defined(__aarch64__) + /* + * Dirty the cache line with a store. As mem_flush() sweeps + * the full test buffer (sized larger than the SLC), cache pressure + * evicts lines from the SLC via LRU replacement. + */ + asm volatile("strb wzr, [%0]\n\t" + : : "r"(p) : "memory"); #endif } -- 2.43.0