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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0429C433EF for ; Tue, 31 May 2022 16:03:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345974AbiEaQDP (ORCPT ); Tue, 31 May 2022 12:03:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48160 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238680AbiEaQDN (ORCPT ); Tue, 31 May 2022 12:03:13 -0400 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2076.outbound.protection.outlook.com [40.107.237.76]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0D3CCB7CC; Tue, 31 May 2022 09:03:13 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=REgk9oWcmX0g6Tee/FbP9B+pBJV41Nk60bw+yTR2dx+OeeNiUjl2VOfFZiPzzToSS5gjSYIlgjG9gLSmkFfyP5E6B5q4bib9WHmbUucOQ8hY12gfw5SodaH0PEz0rBrV2oT3F9Co7rnhFvP7/v/mrRG0/v8Ex71Oggd9tyAfxz9Ytz9gzvVZyot0SR+JGAh8XTuMezcDcqvt/ER4aR/EHbnLTfkrVxeLn5ovRHB0rBurVmDOwP1oSzZWN7g0B8od06GKwV0GpdhQEzHrMXxWAOJPXikDEkwjAzddFh8P7GqgpizI1hBlgPPKAkmZ1RdwGZamqyfOSR2TTg7ju+QaGA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; 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=hCcRjUPpmiNd7zDB3/L9bk8oboZifp99E1HGeLEDv/c=; b=Pgh1rPbmeUkrFONhxx4nhKAyDwDFbctX5ZPIUONLKHWP4aDSoAzMzsWv6Ar3haOGExb5VwTsj+Xg8Tn6IHeAqkTh6WszxntDTHMXCZkuKhqkPsxhhWjhM+ngEGscxRcGKw4khI9ITrFLc+fW6ReAxwyS9xL4X40PIb4EaOhtmUGBa3oCt7EYh6xuETFHd/zbUC0JftSdddUk8G5BWOK/usMWB/ooUVrnnzK0jYBifsQ2ivfnfTnZOLsHUz2W5UHX4hKXm7cRnFtGs13SYFCZAqilZchaNt47KkJoX3XYlsZRQagMWWOFjRFjcx6GfMx/MqT1lEogHlqwSQxLovgngQ== 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=hCcRjUPpmiNd7zDB3/L9bk8oboZifp99E1HGeLEDv/c=; b=mtPdqiBQU9wo/SRqO2GsZmftujJANtKUTdaWuXtRLu6qgMILaPdT2vN1fzubhU+SPzqgTzeqvI5Br03SMpploXBKBhHuMpTalL6vG/wQDpMcGNpWgBhktQ1+OZ0jqI8O/MGJPbYglISa3O6dpw+kXaFxOzClQUCdrb1qfCM4r8g5jtRV/TUTjZLJps8OC3zEszQfiIwmXw/gtk8EwUrxLfpp3yVlpWarLN4MeH0QyslFT896qlhGcSJpsRvlgyvcLVwIuy6g8NgrKtT7B2v2D/CdngoFEu+E9kP56SA4gWisKEyVf57pQdmC/L8luNO3SuOyKF9lPYe8IEN08b17Cg== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) by MWHPR1201MB0224.namprd12.prod.outlook.com (2603:10b6:301:55::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5293.13; Tue, 31 May 2022 16:03:10 +0000 Received: from MN2PR12MB4192.namprd12.prod.outlook.com ([fe80::2484:51da:d56f:f1a5]) by MN2PR12MB4192.namprd12.prod.outlook.com ([fe80::2484:51da:d56f:f1a5%9]) with mapi id 15.20.5314.012; Tue, 31 May 2022 16:03:10 +0000 Date: Tue, 31 May 2022 13:03:09 -0300 From: Jason Gunthorpe To: Baolu Lu Cc: "Tian, Kevin" , Jacob Pan , "iommu@lists.linux-foundation.org" , LKML , "dmaengine@vger.kernel.org" , Joerg Roedel , David Woodhouse , Jean-Philippe Brucker , Christoph Hellwig , "vkoul@kernel.org" , "robin.murphy@arm.com" , "will@kernel.org" , "Liu, Yi L" , "Jiang, Dave" , "Raj, Ashok" , Eric Auger Subject: Re: [PATCH v4 1/6] iommu: Add a per domain PASID for DMA API Message-ID: <20220531160309.GG1343366@nvidia.com> References: <20220518182120.1136715-1-jacob.jun.pan@linux.intel.com> <20220518182120.1136715-2-jacob.jun.pan@linux.intel.com> <20220524135034.GU1343366@nvidia.com> <20220524081727.19c2dd6d@jacob-builder> <20220530122247.GY1343366@nvidia.com> <628aa885-dd12-8bcd-bfc6-446345bf69ed@linux.intel.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <628aa885-dd12-8bcd-bfc6-446345bf69ed@linux.intel.com> X-ClientProxiedBy: BL0PR0102CA0063.prod.exchangelabs.com (2603:10b6:208:25::40) To MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: a172d63d-d443-4dff-a978-08da431f0f40 X-MS-TrafficTypeDiagnostic: MWHPR1201MB0224:EE_ X-Microsoft-Antispam-PRVS: 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:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MN2PR12MB4192.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(4636009)(366004)(66476007)(66556008)(2616005)(5660300002)(2906002)(86362001)(8676002)(4326008)(66946007)(186003)(36756003)(7416002)(6506007)(4744005)(6512007)(1076003)(26005)(33656002)(508600001)(8936002)(6486002)(316002)(38100700002)(6916009)(54906003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?GtDn0KACArBfgAIUl7lKFQ5C+ajjc5ul/s+/Kjn2EVKxYJnRq+SFhmog5uIG?= =?us-ascii?Q?vMMiaks2mHRk4bzlJe50eIclrUfM+V2fgRnq+/icMExw6OEtwhbbBrEdKWnm?= =?us-ascii?Q?xNdz+CapEzg4c9gffEQA2neXn/2+HOsuWZRd5dtHK8UxXY2zH74On27tqvX8?= =?us-ascii?Q?O9Z0+9j0JbdHTcHLhisUNWVVS66ndWqMyxzMv2n1GfZ+1p26KDCDvICE+95d?= =?us-ascii?Q?Le3zeEBozaieP9FXEH90V4VJKY69uoHkUcD9hooLrB/IlyyVSX6Ufp/nEKvV?= =?us-ascii?Q?/VM0RLKXJbCEkZUQqrvPflE1MLkl6L1b5Vln1sK2FytMRBJxuUiX7xx2UYvl?= =?us-ascii?Q?5T767jAXAR32lTCHGSl7pFP4EHOb8E0K1b685LBlDYCUM9eUnWkbLGrhEFAp?= =?us-ascii?Q?rv34+1e7bSdxbvj+LYpcQW4+wQQu7Iy064GixJfQO+BdNL5iSxJdkmGVRv7Z?= =?us-ascii?Q?sxAyQ1WTjMeY0GjcMwo54AgfTUue1k6I423wza79GKJZtkcIPLFGELUYBV+Y?= =?us-ascii?Q?Zz2k44NY5Cl2kYY5lBMS7wdlSt/zB4oUsL16EsdDPR8T8DALONZOEc/wmveC?= =?us-ascii?Q?WgDFTp92jNPPGnc/IeAsiZQgCtX62SFpjyxbfKNMbZ4TsE9uxuUaKmQTXCeN?= =?us-ascii?Q?7XTqPj8bvMnTtMWgRhXgs9L/zaXzpLqrHm091dl4Y5xIJsYXGnoGKUkppZ2W?= =?us-ascii?Q?UrwIBSSlF2i2xyqbBpivufdu6Rs6fq4+1/BfCAwNuevolD1CoRoZanz6+125?= =?us-ascii?Q?sKpAQjlMn0jT2Z+paN8Sp92zqQabBDBdbmBiIVvahxe9wuWEpAKEu9YMtk0A?= =?us-ascii?Q?XAm4JISZJ70EqgHTP/i2hxrifQ98gkqvicGNys+SuU2uj0+EjwWK7pTsMqgu?= =?us-ascii?Q?F8bW9WHU1l6NxH9pHImr7f1K4Hn5r90G5ACCzk4J7UJoFiWgA6HaaiUnzPCf?= =?us-ascii?Q?wU3XtBFPJTYqz1IV1C6TPJl+2RR/Ri47hLySkAJfQqsOWnxXDJncwlSZoUip?= =?us-ascii?Q?vLrbQPbs4gdHD7//RYAWIAU+CCxTo0d6IoJJwkF6294kWrqlTR+8Ik5ogeZX?= =?us-ascii?Q?Lvi2WqBHw2CdV/stGoxSu2yhLBtPALnuM60J5VfKXE/TM5ePJx7y+4kvXbsR?= =?us-ascii?Q?FgZ7e+LLqoOvhKf0L+JVs69k34MmFeLZBQiLeVo1uLe1Ku5EkBb9CQdatBw1?= =?us-ascii?Q?uDDmK/tYnZrM0U+IpdIzDSK5gvdPxiz1CbN0vQoqHCbF4zklTUcqiU0AdAsl?= =?us-ascii?Q?jpv+fO8UkKaPeCrG3hiTNish7pRdMdUcO3YfR1iAFJY07wyvQ6W1qF2U+F4t?= =?us-ascii?Q?GcwiFv1kWI9o2m0GZqwqAR5sPwii30K+YfMSHPpP2lgRCOUHSIxHZbIPbxs2?= =?us-ascii?Q?OF6oNIszyf1jKr5tq6UBUoeDlWwTI9lRvDbZTuqiFDQJGP3iUSLEUSrBCqBJ?= =?us-ascii?Q?P/UKpUI+RiLIWmrGJgOM3FNyJMyw0Jt5rMIcS4AnamIGc7moKTm8981OAaSy?= =?us-ascii?Q?AdFOQ5WMFaTnzUFeMIiPoDB3rC2ab54UPCjRNlJKHhlzzfzVhs0UekM3c+7F?= =?us-ascii?Q?omtTn6STEgTCbMUKr2S3FJ0gq/nwLFQj4Ci4DP1++YPSiG5r3a+hfqcalupz?= =?us-ascii?Q?ZZvccyL7SdUHaXkFuLCyXpY5qyEEtmDGP5MT3VFVCeAr4GkY1R0rAambBvFN?= =?us-ascii?Q?Ud9cJNxxS/y21XScBOw6eWqUIk1DTppU85BefBfAvVhh1zVFonVw9U7Azuht?= =?us-ascii?Q?iTqZGNOzXw=3D=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: a172d63d-d443-4dff-a978-08da431f0f40 X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB4192.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 May 2022 16:03:10.6539 (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: HgtEsa9b+PzaDnCiS7B3kazOgnYcGk3rcckVRFnYYIj+RSlSCUMIq52LMZz2Bl14 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR1201MB0224 Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org On Tue, May 31, 2022 at 08:45:28PM +0800, Baolu Lu wrote: > My understanding is that device driver owns its PASID policy. I'm not sure this is actually useful, the core code should provide the allocator as I can't think of any device that actually needs a special allocator. > If ENQCMD is supported on the device, the PASIDs should be allocated > through ioasid_alloc(). Otherwise, the whole PASID pool is managed > by the device driver. This is OK only if we know in-advance that the device needs a global PASID. ENQCMD is one reason, maybe there are others down the road. Better to make this core code policy. Jason 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 smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 2EC1CC433F5 for ; Tue, 31 May 2022 16:03:17 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id C272B41948; Tue, 31 May 2022 16:03:16 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iqk7nNECJO68; Tue, 31 May 2022 16:03:15 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp4.osuosl.org (Postfix) with ESMTPS id 6353441949; Tue, 31 May 2022 16:03:15 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 444EDC0032; Tue, 31 May 2022 16:03:15 +0000 (UTC) Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id E3821C002D for ; Tue, 31 May 2022 16:03:14 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id D12DF40604 for ; Tue, 31 May 2022 16:03:14 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp2.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=nvidia.com Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Q5Sl1pf_-zsI for ; Tue, 31 May 2022 16:03:14 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.8.0 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on20628.outbound.protection.outlook.com [IPv6:2a01:111:f400:fe5b::628]) by smtp2.osuosl.org (Postfix) with ESMTPS id 1F95E40104 for ; Tue, 31 May 2022 16:03:13 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=REgk9oWcmX0g6Tee/FbP9B+pBJV41Nk60bw+yTR2dx+OeeNiUjl2VOfFZiPzzToSS5gjSYIlgjG9gLSmkFfyP5E6B5q4bib9WHmbUucOQ8hY12gfw5SodaH0PEz0rBrV2oT3F9Co7rnhFvP7/v/mrRG0/v8Ex71Oggd9tyAfxz9Ytz9gzvVZyot0SR+JGAh8XTuMezcDcqvt/ER4aR/EHbnLTfkrVxeLn5ovRHB0rBurVmDOwP1oSzZWN7g0B8od06GKwV0GpdhQEzHrMXxWAOJPXikDEkwjAzddFh8P7GqgpizI1hBlgPPKAkmZ1RdwGZamqyfOSR2TTg7ju+QaGA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; 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=hCcRjUPpmiNd7zDB3/L9bk8oboZifp99E1HGeLEDv/c=; b=Pgh1rPbmeUkrFONhxx4nhKAyDwDFbctX5ZPIUONLKHWP4aDSoAzMzsWv6Ar3haOGExb5VwTsj+Xg8Tn6IHeAqkTh6WszxntDTHMXCZkuKhqkPsxhhWjhM+ngEGscxRcGKw4khI9ITrFLc+fW6ReAxwyS9xL4X40PIb4EaOhtmUGBa3oCt7EYh6xuETFHd/zbUC0JftSdddUk8G5BWOK/usMWB/ooUVrnnzK0jYBifsQ2ivfnfTnZOLsHUz2W5UHX4hKXm7cRnFtGs13SYFCZAqilZchaNt47KkJoX3XYlsZRQagMWWOFjRFjcx6GfMx/MqT1lEogHlqwSQxLovgngQ== 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=hCcRjUPpmiNd7zDB3/L9bk8oboZifp99E1HGeLEDv/c=; b=mtPdqiBQU9wo/SRqO2GsZmftujJANtKUTdaWuXtRLu6qgMILaPdT2vN1fzubhU+SPzqgTzeqvI5Br03SMpploXBKBhHuMpTalL6vG/wQDpMcGNpWgBhktQ1+OZ0jqI8O/MGJPbYglISa3O6dpw+kXaFxOzClQUCdrb1qfCM4r8g5jtRV/TUTjZLJps8OC3zEszQfiIwmXw/gtk8EwUrxLfpp3yVlpWarLN4MeH0QyslFT896qlhGcSJpsRvlgyvcLVwIuy6g8NgrKtT7B2v2D/CdngoFEu+E9kP56SA4gWisKEyVf57pQdmC/L8luNO3SuOyKF9lPYe8IEN08b17Cg== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) by MWHPR1201MB0224.namprd12.prod.outlook.com (2603:10b6:301:55::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5293.13; Tue, 31 May 2022 16:03:10 +0000 Received: from MN2PR12MB4192.namprd12.prod.outlook.com ([fe80::2484:51da:d56f:f1a5]) by MN2PR12MB4192.namprd12.prod.outlook.com ([fe80::2484:51da:d56f:f1a5%9]) with mapi id 15.20.5314.012; Tue, 31 May 2022 16:03:10 +0000 Date: Tue, 31 May 2022 13:03:09 -0300 To: Baolu Lu Subject: Re: [PATCH v4 1/6] iommu: Add a per domain PASID for DMA API Message-ID: <20220531160309.GG1343366@nvidia.com> References: <20220518182120.1136715-1-jacob.jun.pan@linux.intel.com> <20220518182120.1136715-2-jacob.jun.pan@linux.intel.com> <20220524135034.GU1343366@nvidia.com> <20220524081727.19c2dd6d@jacob-builder> <20220530122247.GY1343366@nvidia.com> <628aa885-dd12-8bcd-bfc6-446345bf69ed@linux.intel.com> Content-Disposition: inline In-Reply-To: <628aa885-dd12-8bcd-bfc6-446345bf69ed@linux.intel.com> X-ClientProxiedBy: BL0PR0102CA0063.prod.exchangelabs.com (2603:10b6:208:25::40) To MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: a172d63d-d443-4dff-a978-08da431f0f40 X-MS-TrafficTypeDiagnostic: MWHPR1201MB0224:EE_ X-Microsoft-Antispam-PRVS: 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:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:MN2PR12MB4192.namprd12.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230001)(4636009)(366004)(66476007)(66556008)(2616005)(5660300002)(2906002)(86362001)(8676002)(4326008)(66946007)(186003)(36756003)(7416002)(6506007)(4744005)(6512007)(1076003)(26005)(33656002)(508600001)(8936002)(6486002)(316002)(38100700002)(6916009)(54906003); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?GtDn0KACArBfgAIUl7lKFQ5C+ajjc5ul/s+/Kjn2EVKxYJnRq+SFhmog5uIG?= =?us-ascii?Q?vMMiaks2mHRk4bzlJe50eIclrUfM+V2fgRnq+/icMExw6OEtwhbbBrEdKWnm?= =?us-ascii?Q?xNdz+CapEzg4c9gffEQA2neXn/2+HOsuWZRd5dtHK8UxXY2zH74On27tqvX8?= =?us-ascii?Q?O9Z0+9j0JbdHTcHLhisUNWVVS66ndWqMyxzMv2n1GfZ+1p26KDCDvICE+95d?= =?us-ascii?Q?Le3zeEBozaieP9FXEH90V4VJKY69uoHkUcD9hooLrB/IlyyVSX6Ufp/nEKvV?= =?us-ascii?Q?/VM0RLKXJbCEkZUQqrvPflE1MLkl6L1b5Vln1sK2FytMRBJxuUiX7xx2UYvl?= =?us-ascii?Q?5T767jAXAR32lTCHGSl7pFP4EHOb8E0K1b685LBlDYCUM9eUnWkbLGrhEFAp?= =?us-ascii?Q?rv34+1e7bSdxbvj+LYpcQW4+wQQu7Iy064GixJfQO+BdNL5iSxJdkmGVRv7Z?= =?us-ascii?Q?sxAyQ1WTjMeY0GjcMwo54AgfTUue1k6I423wza79GKJZtkcIPLFGELUYBV+Y?= =?us-ascii?Q?Zz2k44NY5Cl2kYY5lBMS7wdlSt/zB4oUsL16EsdDPR8T8DALONZOEc/wmveC?= =?us-ascii?Q?WgDFTp92jNPPGnc/IeAsiZQgCtX62SFpjyxbfKNMbZ4TsE9uxuUaKmQTXCeN?= =?us-ascii?Q?7XTqPj8bvMnTtMWgRhXgs9L/zaXzpLqrHm091dl4Y5xIJsYXGnoGKUkppZ2W?= =?us-ascii?Q?UrwIBSSlF2i2xyqbBpivufdu6Rs6fq4+1/BfCAwNuevolD1CoRoZanz6+125?= =?us-ascii?Q?sKpAQjlMn0jT2Z+paN8Sp92zqQabBDBdbmBiIVvahxe9wuWEpAKEu9YMtk0A?= =?us-ascii?Q?XAm4JISZJ70EqgHTP/i2hxrifQ98gkqvicGNys+SuU2uj0+EjwWK7pTsMqgu?= =?us-ascii?Q?F8bW9WHU1l6NxH9pHImr7f1K4Hn5r90G5ACCzk4J7UJoFiWgA6HaaiUnzPCf?= =?us-ascii?Q?wU3XtBFPJTYqz1IV1C6TPJl+2RR/Ri47hLySkAJfQqsOWnxXDJncwlSZoUip?= =?us-ascii?Q?vLrbQPbs4gdHD7//RYAWIAU+CCxTo0d6IoJJwkF6294kWrqlTR+8Ik5ogeZX?= =?us-ascii?Q?Lvi2WqBHw2CdV/stGoxSu2yhLBtPALnuM60J5VfKXE/TM5ePJx7y+4kvXbsR?= =?us-ascii?Q?FgZ7e+LLqoOvhKf0L+JVs69k34MmFeLZBQiLeVo1uLe1Ku5EkBb9CQdatBw1?= =?us-ascii?Q?uDDmK/tYnZrM0U+IpdIzDSK5gvdPxiz1CbN0vQoqHCbF4zklTUcqiU0AdAsl?= =?us-ascii?Q?jpv+fO8UkKaPeCrG3hiTNish7pRdMdUcO3YfR1iAFJY07wyvQ6W1qF2U+F4t?= =?us-ascii?Q?GcwiFv1kWI9o2m0GZqwqAR5sPwii30K+YfMSHPpP2lgRCOUHSIxHZbIPbxs2?= =?us-ascii?Q?OF6oNIszyf1jKr5tq6UBUoeDlWwTI9lRvDbZTuqiFDQJGP3iUSLEUSrBCqBJ?= =?us-ascii?Q?P/UKpUI+RiLIWmrGJgOM3FNyJMyw0Jt5rMIcS4AnamIGc7moKTm8981OAaSy?= =?us-ascii?Q?AdFOQ5WMFaTnzUFeMIiPoDB3rC2ab54UPCjRNlJKHhlzzfzVhs0UekM3c+7F?= =?us-ascii?Q?omtTn6STEgTCbMUKr2S3FJ0gq/nwLFQj4Ci4DP1++YPSiG5r3a+hfqcalupz?= =?us-ascii?Q?ZZvccyL7SdUHaXkFuLCyXpY5qyEEtmDGP5MT3VFVCeAr4GkY1R0rAambBvFN?= =?us-ascii?Q?Ud9cJNxxS/y21XScBOw6eWqUIk1DTppU85BefBfAvVhh1zVFonVw9U7Azuht?= =?us-ascii?Q?iTqZGNOzXw=3D=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: a172d63d-d443-4dff-a978-08da431f0f40 X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB4192.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 May 2022 16:03:10.6539 (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: HgtEsa9b+PzaDnCiS7B3kazOgnYcGk3rcckVRFnYYIj+RSlSCUMIq52LMZz2Bl14 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR1201MB0224 Cc: "vkoul@kernel.org" , "Tian, Kevin" , "Jiang, Dave" , "Raj, Ashok" , "will@kernel.org" , Jean-Philippe Brucker , LKML , Christoph Hellwig , "iommu@lists.linux-foundation.org" , "dmaengine@vger.kernel.org" , David Woodhouse , "robin.murphy@arm.com" X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Jason Gunthorpe via iommu Reply-To: Jason Gunthorpe Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Tue, May 31, 2022 at 08:45:28PM +0800, Baolu Lu wrote: > My understanding is that device driver owns its PASID policy. I'm not sure this is actually useful, the core code should provide the allocator as I can't think of any device that actually needs a special allocator. > If ENQCMD is supported on the device, the PASIDs should be allocated > through ioasid_alloc(). Otherwise, the whole PASID pool is managed > by the device driver. This is OK only if we know in-advance that the device needs a global PASID. ENQCMD is one reason, maybe there are others down the road. Better to make this core code policy. Jason _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu