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 5C50BD74ED8 for ; Fri, 23 Jan 2026 13:56:27 +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=ZFcaVJGQZ2VFUDpvaxPboe86gU97N8pZ+x4A3YM8ql4=; b=n9e9Oc+prDguZs61Xn1sTshqIj g5h2PBo12ewLTz8ZlJhy4zJnyOg7zx6Bp7q23nwGNDzBm405L1DnqIEpTT2OkpAD/T0zbCaVeK7q0 +kgR+xbo8iVUWBVHX3yuzA2NLAT9lVzs1rA4QXQyWD/t9IQvws2T20Bnoiky+M/rgGWT/t8c2XeUj f82Wmkxl7ERur7Y/9nTdT6LD/VXv834C3g9Mfk91Mh2pZB73syjmCCSU+trPV/5+pPo0J6TDI/wBm 78LaCNc/amjbH+WaQkp/w9WhYLBOGhWCWrgaia3g4Z8wVy7V+C826vZ4VqQldI2HWZmL/VNhoEpoN u7aY1Hxg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vjHe4-00000008zZ1-45yI; Fri, 23 Jan 2026 13:56:18 +0000 Received: from mail-westus2azlp170120002.outbound.protection.outlook.com ([2a01:111:f403:c007::2] helo=MW6PR02CU001.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vjHe2-00000008zYc-1h3k for linux-arm-kernel@lists.infradead.org; Fri, 23 Jan 2026 13:56:15 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=Ys2jAp1WaTNbjzjuGqfFQauCiic5T6r64n88fUEDdc8LhdxWyp8Ugfa1tJEecLQaHTIkqZrhfKedJAQCxv8mwcaBauB6uS7ep4/s/tFiOZwp/em/jLt3+Db94LfrH1TBmVKDiyB3P9U//MWw7Kd/wlJn4hhY3rW6dT1/jTR9NVQPrlPP9Rg5MBBpd0vs9fEAfhsFngExFhaw43pUPOGA8gNQ/BL3v1ubtbDqgsL5ToWu+zXMIIOI+X5/1B2icBH2s97Dwrp8oGRBYqrbu6T3p8fOWU44TZCJzaZM/USCwiJ92B7j51FuzFlN8ZKi9ZgpvzMFqiD3+wrQdJhcd3SrPA== 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=ZFcaVJGQZ2VFUDpvaxPboe86gU97N8pZ+x4A3YM8ql4=; b=diAmd4RKdsBcuPEh7ePDSxExSW9Ye/q/D90VSAqlKJYpgQXXjVcDwbEx+u0dmBO8SdQXXLTyNMOMSvXwjzEoXlcjUFuy16j2ZW1GH0WymqkZtLtzLASvrQ3xS1DV33hrZJtq4HMfkf1s74FnSbtnFeKi2Pmlwa83+yXJU70JYN0d2/156FgAZ5PaQR5RB19GYS1VMHinXgz0zdkO43DGgH2ZxA5Px8X00Ktg58WY3zF3x34ulXwTPnSpkw3ZAwijO4zv0CaYl0Lt9r4OR8moCa9y9KQIG2jZI7jI+xrsG74KCCyU2mNJlt74VNsRybmgM+iZaeSx5V9QEGd8cYK0EQ== 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=ZFcaVJGQZ2VFUDpvaxPboe86gU97N8pZ+x4A3YM8ql4=; b=PlJhUI/bGUWDPcduSa5cU3rSEf616++0Zn4hxgPB0IiKmw2zxg0sSslX0fyqOl1guVxREoJjNsXkJ1Hlj2stnEt3dO1SumAO1eZVyl3PSXD3xOa9+7P4xapIOiwh8H3rfgM69mMlzEdBdM42b+ZR4wbl7Mq9/7ZLtN6NeVUpRNg+frC8ysoDJBg9T1PYhIq1blyP9CU/TgJ8bdYPCT0bDr7LAz8HV357r8f6HX6bXzCHyXmhbRtC/1dGdaQ/9SrosTHIX+7ZAHJjMDhtyVyoQH1FOyRFKs+JMt6r7nCxFcnmKBNjzpg60J7q7M2Al5iL3dJt3q6w1DZoeVvm/p16IQ== 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 IA1PR12MB7592.namprd12.prod.outlook.com (2603:10b6:208:428::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9542.11; Fri, 23 Jan 2026 13:56:01 +0000 Received: from LV8PR12MB9620.namprd12.prod.outlook.com ([fe80::1b59:c8a2:4c00:8a2c]) by LV8PR12MB9620.namprd12.prod.outlook.com ([fe80::1b59:c8a2:4c00:8a2c%3]) with mapi id 15.20.9542.010; Fri, 23 Jan 2026 13:56:01 +0000 Date: Fri, 23 Jan 2026 09:56:00 -0400 From: Jason Gunthorpe To: Pranjal Shrivastava Cc: Nicolin Chen , will@kernel.org, jean-philippe@linaro.org, robin.murphy@arm.com, joro@8bytes.org, balbirs@nvidia.com, miko.lenczewski@arm.com, peterz@infradead.org, kevin.tian@intel.com, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v9 6/7] iommu/arm-smmu-v3: Add arm_smmu_invs based arm_smmu_domain_inv_range() Message-ID: <20260123135600.GX1134360@nvidia.com> References: <06999367d001283744fd98eb7c1823afd516ce84.1766174731.git.nicolinc@nvidia.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: BL6PEPF00013E01.NAMP222.PROD.OUTLOOK.COM (2603:10b6:22e:400:0:1001:0:1c) To LV8PR12MB9620.namprd12.prod.outlook.com (2603:10b6:408:2a1::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV8PR12MB9620:EE_|IA1PR12MB7592:EE_ X-MS-Office365-Filtering-Correlation-Id: 3cf97281-a894-4ba0-d9bf-08de5a872481 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|376014|1800799024|3613699012; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?9/uzpiCMKlWrzFEIEC5YK3/re5E38n72mpvQkf1CnxGDpHvc06eJQaswEBJZ?= =?us-ascii?Q?YxoBHoALAemz9rH4VBAlH+wfi+JYApiF8hxzRUFw0Nf1pqyMnSVrSYLPRQ/9?= =?us-ascii?Q?C2CTMmyFsWyjCd++C2ja34tfvIMCv8RWiyLtoUjiKK4+5eV6QtHR2r3OUIbN?= =?us-ascii?Q?BY1JcPdij5EiI2FoHtbFiWXLATdw/tPhTSwjFvSg4VkZb6ak4zcdrzanLywx?= =?us-ascii?Q?Un7+T7szaiJWzZMt8/ovyrttCL3EFtoyTXlHKWgnhSyuHrqOPk+h4171xjXy?= =?us-ascii?Q?3vBeRSJmYDNF2JV0AHVEt6p4Y94VVdFyenkKkfUW291nI5FYXtafrR/Uwfdm?= =?us-ascii?Q?d3qo9Qr4edkp9BtX8rELLlVVPa9ShnxriQrL13UQg1IK7kFtcwj6OcB2HloR?= =?us-ascii?Q?7cuXB8lKzMgbMBoI8G7yjoxk1Aq3NlMPKfss4jJk5v0NZl0CKDGBmgTF3V/z?= =?us-ascii?Q?df6t7vACvbzkzwPCvgRje9jotetvxww+rakNqRTxjH0X1rIfbGNXwnd0AWXH?= =?us-ascii?Q?XgG/XTVwtYMr2HcvfliiGxzAticV0lw+Z0LUzzah91t2gPKtZa84VdOu99TU?= =?us-ascii?Q?yv/gTLzQV7xvo/Y1PuvUwBJwE16V8mJkoLSstyOIoHqOL15fpI5W+EYSnkXz?= =?us-ascii?Q?CKRBL98eo8UcUeITJ7eFRhYUgA57z1+dG4ttBmtdky+x0YMjdApQfJ78Pb98?= =?us-ascii?Q?sgIxiJlKLgIJ7MkfHZSpUSDVIzws2QPFVnnof/yCEZ0P5Oq+7Pq6MiPLJHV+?= =?us-ascii?Q?kZqZwCjXmfh2u9enHRJqmURqdSGHrykUOPXk1GVZ7WyW+6MYHaVG4QATgoGN?= =?us-ascii?Q?AEYGKLwnv7q9BHKhH+2530+boVG4fJfGC7yIEn14DMpis3A9jnJZfxdGXkl+?= =?us-ascii?Q?76Z/dXlK8M6v8Ql1EYc8XaCX6YY3kUUlgY0RiU4Lxx2pll13kW2eXhkQ3pKE?= =?us-ascii?Q?8Q0Zw6Y/SDAh+bZYG6kbevUuTs0OD2jZwvItxNoE8X26pE+I1pUAvNlTbA+o?= =?us-ascii?Q?uLJCogAzlo4jCT0aqsjMQvMfUM4+rlGQkI647daA3ioXkSYHMn7qrUrqxGLr?= =?us-ascii?Q?sx6BviKbpIiD8f9OL7K3mbgYDC24Cn2hSLFMet77avwquM2HEyf5B2GRZuUb?= =?us-ascii?Q?dyHql38eQZZKbQx+Z1oydQe8NAVGbRONG2Q7nfLgyKbbbmNEGtLsS3BllLea?= =?us-ascii?Q?19927Ae4ETbZ388pLK23Ab3klIrGjXKiOrPC78FA46i3Z1b7RLI4Xs29+LrZ?= =?us-ascii?Q?Evgvc27a2YyqK2G2IIq6RlaK5ENJy2sH+7Y6XQZ+PWJSUIWJNTHpByPoP/Qx?= =?us-ascii?Q?puWC4JcNfvsulqRDFCIhgyPVRdQErAVWE5nmUbHoI1s11ysx2ElE59x+rbqy?= =?us-ascii?Q?0aDQo1we5E7sPDaOLjgyc2trz3cIwjJJflygxlr9JGob1kKSIJ9UKQV5lVZY?= =?us-ascii?Q?kidL48gSjyJ2Iwj2v5lNc3aCG5BKU4efC0FLy9mQfp/iBjt+z/Vif82j1Jeg?= =?us-ascii?Q?3zmdAUMU0E1LIE4C/RQ2smqBGMxP2850vnRwsei/KQ8mEm0jHJlgjoTOBKMB?= =?us-ascii?Q?NheR5DyfJIFCHZNRLqKckZhdtNOhtDjLmYpr91jybmZC9VcjMcBNs9maq95g?= =?us-ascii?Q?yjNDCFEoP4ROicbxVioOdis=3D?= 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)(366016)(7416014)(376014)(1800799024)(3613699012);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?EkY5TzKzb+bfCJh9RuKL9CZr8UIVwkDvgXnWOC2pvH/U9SyRv5ds4jADzMP3?= =?us-ascii?Q?qMaBAtlqHk9F4WglTy6bBJLH5KUiIZ2wkoTH3oFH5iiJkvqskbhore5B1Z3/?= =?us-ascii?Q?cb5qUb97tVcNpKKohcCdu9Y/uGnni+dXDjeC0HAuYtWhzs+Q2F11kEwoirRY?= =?us-ascii?Q?ahh5csstVBBh7oqo0c6GP0KzwUAbg4ohaXKc6Zxju8HTV0/ziHeJtwFfoyrb?= =?us-ascii?Q?vSfSZdPn2nw1zhKt2K5o82fbqEyPVt0zfTiSpQsLBd3i5zWhyXhgxPfbQ7Pp?= =?us-ascii?Q?Uub/7WOSzYgkN+JLBjOQmdWErA+/blJsrONg2OJKjpY60TB8fxPGDcfPrpp7?= =?us-ascii?Q?hiJh+I1PY8smJP1YIsa9AGMfcbGlFlzpX98e6j4ba7WC9arhKiZpf2bjAKnv?= =?us-ascii?Q?/oCMtTBVngLQhc3ABcjGqgk+ouXnLtLhe4FZHSeQcMAOnvR0Pps+BLAPwSas?= =?us-ascii?Q?5G3ZgkjZrUH8/+McTCQ883f2KnNMYjMLEmansQ0tbQ5gxY5DGb5rdiKPR2g1?= =?us-ascii?Q?FQhGZcoxPfO7GJ5Yb6/ks/ZEO+LDHLWKUjWBUTKIjUE4NZZcqKZEP5FB1cnY?= =?us-ascii?Q?mObUSA6LB2bGc832eVA2Yme5zcc+w14JW+hFcxeMW/BBnzh5JuK9Vo6tyuXB?= =?us-ascii?Q?OMY23f8GrVReA7ajnYP+Fh75SqOWVFKBEUVRycay3WJf8+TRet4/wvKXZYRK?= =?us-ascii?Q?kcoLnfkB4weCPudvmYzoTKeC4PxfTVOg4gy1XN03QHoYrNI09kkydST7p1xx?= =?us-ascii?Q?3mXvoz1qc1Iv1+wQKmXIz5ioe2F4NHTxI+f0F18EQXPJ0vvnFe9xAs2PqhGW?= =?us-ascii?Q?FTHGBYwtkafOXvVNhmQ8cWn+vMRYqQKnDukHmFkTXY5vRMRer9CmxaS5u9bu?= =?us-ascii?Q?bru3Z0qy16GyTIIeeZO2gNqb2eOVGzYwndQ6hWBMTmbloWjbV9w0ALSe2l9s?= =?us-ascii?Q?56P/ARSU7hMjCHQOu7jjzc/6VoTho8iPxtnMZOJOSHA4eaKKblwvzWutmHQS?= =?us-ascii?Q?06yUYyBY2qvbx3oI8jD8h8y9cjkMOvwFzbPYBB6k3WU7BKURaIuhNQsy9zJx?= =?us-ascii?Q?ZH5Moh6DiQ5Hwl9UoCn2tBp9iUVLLHZQtQfCZ7sz5qg/+W3++6quA+jkGSx8?= =?us-ascii?Q?A/46W6ZQQQXOoDUH9IuRrNWZAPddFKcRJDmKCssBcSlxIhiXXbMmIwCNjOU8?= =?us-ascii?Q?tAuGiFSyAtDsTdaDKEarWCtjWt9DiOi+QhO6ut/t1ZB2iXKd4o2NdZK+yau/?= =?us-ascii?Q?aJj5FBACQf7ZrANBWON6ZZ01ezZ18v2NBgGVD9KyDNPIr27WiBuXuiLRZtiQ?= =?us-ascii?Q?fUn+pKgmAz5t2AqLDlYgzxwGXIFoHQgcISdl8IzbALL266yH4Psmlye+BpFU?= =?us-ascii?Q?Aw/kOcFZ4ISWvRwDdeWRj9q80PIsxRdJh6KDCh0WEBqpPNvv4o+bpmsz3lY8?= =?us-ascii?Q?UOqEWfJkLe1WgSyZI/0p98phlumP0V8ThdYPqIgMUeWh5tB16e9WlMC2teBk?= =?us-ascii?Q?XpCRdCbR7VEpWwrJRBZCjIwPF7imYLQ1vsrNUSnYFhskq9KcwmismE8YTS6H?= =?us-ascii?Q?0x9+IT5iZ/T3I05OEFQizLENqApv5kCv4k6pPOxfi9TimWuIbV75zEzEhNq1?= =?us-ascii?Q?37ogzVmCIWu0FMCX4DazMFBB+YM5r3rjo8mo6EUNJwfqAurnNLum4A74DmhN?= =?us-ascii?Q?GyjQDRUZVhRGkloBdE0gpTG6QOx9fR2pmwre/leoLgITVhbDybScb3BjRzET?= =?us-ascii?Q?D4fxaKfZzA=3D=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3cf97281-a894-4ba0-d9bf-08de5a872481 X-MS-Exchange-CrossTenant-AuthSource: LV8PR12MB9620.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jan 2026 13:56:01.5094 (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: hrrbyCTkHm8G23bs4+hTwD65xkByXor2eM6SycumXnAV05PdXOIQtOH8tNL7LgcH X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB7592 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260123_055614_466149_229EFCB0 X-CRM114-Status: UNSURE ( 8.01 ) 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 Fri, Jan 23, 2026 at 09:48:37AM +0000, Pranjal Shrivastava wrote: > For INV_TYPE_S1_ASID, the new code loops and checks size_too_big > via arm_smmu_inv_to_cmdq_batch. However, for INV_TYPE_ATS, it issues > a single command for the entire range. While this matches the current > driver, are we confident arm_smmu_atc_inv_to_cmd handles all massive > sizes correctly without needing a similar loop or "too big" fallback? At the PCI level ATS invalidations accept an arbitary byte range, so all ranges should be converted into a single CMDQ command and pushed as a single TLP. The issue the "too big" stuff is solving is for the IOTLB itself which can require an invalidation rage to be exploded into many smaller commands. Jason