From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BEA641061B37 for ; Tue, 31 Mar 2026 12:08:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:MIME-Version:In-Reply-To: Content-Type:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=AMuiR5FANByCN2kHwFzhr8xHmsKqH7ZwueFZJt//iU0=; b=kAQOSKTccE0HLWYhEBf8Ss/w7X AfbwfiFg3h4YYWr4ZsG0/dwdBEYLyFso1qHkfkVLg4qEAFCtLIG0M96b19PpdQ/krLqnAee9yfhwn AAXK8vzKa6w6W4DhsY5MfHICSyH4zpoZp/lmR8h6zITEjwq5TMUJHUL2Ugq7IyOxgNjZ22ynd0C/m lRn1OyuvaUnwan8X3dqrpstAEFkGvcD1PtD29hpLiX2jD8ZksOcTttGxwmFmI4YMzrvSzSJsYOFRt ldyK1NGmsux4ZpQKdgZUA9CL6m/KcgHTrXdAcBuvJL9pHIzQkJ2JrUQQB3ZP1kBeMqwuIceXVl0mw rH7hXfiA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w7XtW-0000000CuoX-3lGz; Tue, 31 Mar 2026 12:08:30 +0000 Received: from mail-westus3azon11010046.outbound.protection.outlook.com ([52.101.201.46] helo=PH7PR06CU001.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w7XtT-0000000Cuo5-2TL7 for linux-arm-kernel@lists.infradead.org; Tue, 31 Mar 2026 12:08:28 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=bUS6xNE3XpZLEJ3AxaHhy7pfe1BCne3lL2iv37miGwQpJ+HO1rbQfHKh2zGB3Uf/vN0fFYkqSpbkiZROqIe1J/1izJfhDq4We6VOkiGw1pW33agkFGElOe57Y+EsfDPLj0IU38mI8opU4DeTgEqbRrX9O6BXAoWEEDth+TNJsRP6jAq0tf/c/YTuurncIFtaN5N+l2B93ZEcvJ8NkE1g7Rwmhf6JuznT96k+NPnPWsnMwreC7AyoRQqRGSr8a23zAXQB92H7n7wEjqZInZC/17N7mIopxUMopcFK/6nO+RT8WHB0BgysvtpJQGcxnoNUKHcq3fH2qyzehAgcG85BcA== 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=AMuiR5FANByCN2kHwFzhr8xHmsKqH7ZwueFZJt//iU0=; b=hX8E8DzEIG+GyE/B+Ghtfl+d6h/StZk3vPAYVPyCkLMEVrfSoPHZx9xNq2LLgPdim+EGTi0iOB1qhWY2rlDi+rAuxZQ48wB/zyZhG1FuRozdBxA1AIsZEcE1BMzsREhCTHZZqDC6yJVx+0U6+FggFyc2OiIaw+TS6hHjrshRviYo2FVw5vsYdb1kbZ9/UrDeTJGGmUaTfcAzyd9GecEEw6OLnt8W4czYj49UNw4C9YY2aD3fxWnMI5zakN2lVQsYF5RDmUUG5k3AK7kKnMaHCibGua2gGDjj15e5Llgcf3DL/gJ7wiyN2TSwv9GyOeEcIuOPObf63n03EpQqOqAuYg== 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=AMuiR5FANByCN2kHwFzhr8xHmsKqH7ZwueFZJt//iU0=; b=sSNXBJRClnnDQEadsZ4VjXxrd+QlR8jsiZvL/zB0FxXFO46CXobvWYyc+pTFMJCPWajDNHieUVS9Xh54Jl1KLA7wmnk9xeLAtOXXxfXxnQ5qFUEVCvfl+l4frqW/e4/rgTuz5D9K1TzW0Hurs8Q8hEDyWTZb8fhyhaAmCBrC++YQR3NT78Rg3MPTGVWPio1y3BEAHOMpMLb910fPNpu6SDgRBBI8mKMS3+W0hMf4DENVhcO390QHrW9wTqiE9in8B7AM74XyGk9endwE7sknQ5Kgc/PRht/woseRqLNUUsumMG0AKM3sw8XC6IAZpdaOISVmxGeKtOUv0MKSA/qNIg== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from LV8PR12MB9620.namprd12.prod.outlook.com (2603:10b6:408:2a1::19) by DM4PR12MB8560.namprd12.prod.outlook.com (2603:10b6:8:189::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9769.12; Tue, 31 Mar 2026 12:08:18 +0000 Received: from LV8PR12MB9620.namprd12.prod.outlook.com ([fe80::299d:f5e0:3550:1528]) by LV8PR12MB9620.namprd12.prod.outlook.com ([fe80::299d:f5e0:3550:1528%5]) with mapi id 15.20.9769.014; Tue, 31 Mar 2026 12:08:17 +0000 Date: Tue, 31 Mar 2026 09:08:16 -0300 From: Jason Gunthorpe To: "Tian, Kevin" Cc: Nicolin Chen , "will@kernel.org" , "robin.murphy@arm.com" , "bhelgaas@google.com" , "joro@8bytes.org" , "praan@google.com" , "baolu.lu@linux.intel.com" , "miko.lenczewski@arm.com" , "linux-arm-kernel@lists.infradead.org" , "iommu@lists.linux.dev" , "linux-kernel@vger.kernel.org" , "linux-pci@vger.kernel.org" , "Williams, Dan J" , "jonathan.cameron@huawei.com" , Vikram Sethi , "linux-cxl@vger.kernel.org" Subject: Re: [PATCH v3 3/3] iommu/arm-smmu-v3: Allow ATS to be always on Message-ID: <20260331120816.GW310919@nvidia.com> References: <0e8d1ee1557c54943dd15ff836576de4c3aa58b6.1772833963.git.nicolinc@nvidia.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: MN0P221CA0012.NAMP221.PROD.OUTLOOK.COM (2603:10b6:208:52a::22) To LV8PR12MB9620.namprd12.prod.outlook.com (2603:10b6:408:2a1::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV8PR12MB9620:EE_|DM4PR12MB8560:EE_ X-MS-Office365-Filtering-Correlation-Id: 361a4fed-d852-4610-0bb3-08de8f1e3177 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|366016|22082099003|56012099003|18002099003; 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:LV8PR12MB9620.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(7416014)(376014)(1800799024)(366016)(22082099003)(56012099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?HOp/VAUYCMWLsya9kpsd8Fikr99V0m60PNBPxcD1HZlsUo2iPMzpvcpHd6KU?= =?us-ascii?Q?7zFBdGEmap2CHir2GmMQ3T7puGYWGtzQ6JREcnne47rtDnGKM53FzcQkVYle?= =?us-ascii?Q?//6GIeU8f1+QbXZuDjVCaB4h52frKCA1reyI1S+JZmUbX1o5rb484RY6aMJf?= =?us-ascii?Q?InowfXQ2RWCxN3/1NV4sL4U1cU2F+rHtOIimv5iLibmquW5XoVcdbBTuqpAE?= =?us-ascii?Q?EfXmkCpoUTgSMt5TsQ6bxJWs3n9jx+dBO4ayPZmWUdsIl+OsiUZTGtWduEt4?= =?us-ascii?Q?YitBUxT+z9dgeqvWW4oRWZiAzbT6aliRGaFSqZRR6ga+EMxCFl8+PwSDAYJw?= =?us-ascii?Q?C23GE0UpWFft61O+Hz/Ol4lImWWE2+UfSU9Fc7RUCC3CHhx1Br6l79vuY2qR?= =?us-ascii?Q?q/Dkv53Jy5RemQtgsNj7rkFfTzkZcIP+aRjGSZxJ/0fycknCdIWvCK+btQND?= =?us-ascii?Q?SYlE3mKbxEU/mmFud5ma3ZC/q2YmTrwy6ns6Ub1ALZQ7Ge12torrUGPb0jVd?= =?us-ascii?Q?MAuMYVjzwVemn4YzOr1ZyGbIukSC0gpLzmPnTcwyHCZQgOr3x5K+dJD/jQ0G?= =?us-ascii?Q?bICtjQqBOvgaOHusLjOryoG+TKaGPNielQ7N86+vSsCv7byqAhuYxdLc4xeC?= =?us-ascii?Q?Ezjl+wpZ2MW6jm8fkrngyx9VQlKflO6XIQCnEBzSZDEsVhvq2uBCY/C6HnGx?= =?us-ascii?Q?OnlTYh/k0cdlmo4RrRC8n8j3EfKTKhlkRohUxvpB0fDGbTg7ef/POIN8DBrD?= =?us-ascii?Q?0G+6S8AGc4XFYgSpywCXdqCyYvD02UuDUzmu303CoId+1joVLI2MwJ1VRqwI?= =?us-ascii?Q?gh6iHZ3hX4FwGHUCYKJjswhk2ItVvSYeAM/Lh+9FQz/3QHLp1uyrze4uFZxn?= =?us-ascii?Q?1N20NdlVzAW0e6cIOsGLbjcw8nVrDRwaQziR6MvL7KVJJozYUI3A5nVGjwRX?= =?us-ascii?Q?G9ykQUlAKdbwRlkpRzHd8RhCKrs905WaVt8r7az3Wxtxyt65OpPkM3GSzXfr?= =?us-ascii?Q?8R2HRtHmn4gXOb6JQrXAt5SuR6tRff8PRWw101JBL1LyfdZvwvGMxwB5O9ej?= =?us-ascii?Q?2ndhYMyQF6IDyuj9rS8dNIrfT9lffK+dCnHFvHypTOLLoTXM5ZnqpNNSWAW/?= =?us-ascii?Q?HkSCJoF+VkeAVRUYWP9BdPUB/pyRBr9NAWdkjtd24SKfe7oJEMYxBAL1PdIO?= =?us-ascii?Q?EiP32DK1+f/ARj7W1W/SKpnxID33OMrqKN91PGfigs9ideUZKzP+AIIfMYNg?= =?us-ascii?Q?3K7gTxQ7CAlnw99zPbakdQiuJl1W00cqj2VCH3cJj0lRN5Zov4Lco5aleLh9?= =?us-ascii?Q?HVnmA8VGpWagrX3zqnxkRKK4JN+VuI23YtdkTykQLu42KxFBQ4qA/zUzlkwq?= =?us-ascii?Q?zYVIEePTk0c6SQP2ZNDS+XJnLBMAkjfF2KNyRoZkQzPccXv8sVzcivftVPdz?= =?us-ascii?Q?XoN4X54w7DG8qmty/8YUmF5mGByPOm7xFT+6l5//JJwkH/KJQ7gpvspAljhe?= =?us-ascii?Q?gXn5377VLRL2tRAAvOsVcypRPYxUC02UoWOXhLTWcQDDyjEFMq+0VWgGZkIh?= =?us-ascii?Q?go5yHcMwgzbeXvKY4hsDTBo9+d7RRaSRVx6pNEY7Vbr2oZhLhmYIndxWvo0E?= =?us-ascii?Q?cq+7FST4MqVjGE3XvPbLKF3arPDq1fX/1s5SEpR4UZXtEHFnZAz1nrp/NyVE?= =?us-ascii?Q?Pd3FzZlWaeUQOdtQ20EDZUzNEIKwWlOVpg0jW3aZaMrrGzje?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 361a4fed-d852-4610-0bb3-08de8f1e3177 X-MS-Exchange-CrossTenant-AuthSource: LV8PR12MB9620.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Mar 2026 12:08:17.7646 (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: xKsDbKju1lC3qArWrKXPtkAZq+mQXk3IGbKF0Ti/m6fEI7d3MWG7d9vP+yiho5jO X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB8560 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260331_050827_708686_522A7E61 X-CRM114-Status: UNSURE ( 9.82 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Mar 31, 2026 at 08:40:17AM +0000, Tian, Kevin wrote: > > From: Nicolin Chen > > Sent: Saturday, March 7, 2026 7:41 AM > > > > + > > + master->ats_always_on = true; > > + > > + ret = arm_smmu_alloc_cd_tables(master); > > + if (ret) > > + return ret; > > + > > +out_prepare: > > + pci_prepare_ats(pdev, stu); > > + return 0; > > is there a problem leaving ats_always_on being true while > allocating cd tables fails? I would expect this error flow unwinds back up to failing device probe? Jason