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Mon, 10 May 2021 23:45:02 +0000 Received: from DM6PR12MB3834.namprd12.prod.outlook.com ([fe80::ddb4:2cbb:4589:f039]) by DM6PR12MB3834.namprd12.prod.outlook.com ([fe80::ddb4:2cbb:4589:f039%4]) with mapi id 15.20.4108.031; Mon, 10 May 2021 23:45:01 +0000 Date: Mon, 10 May 2021 20:45:00 -0300 From: Jason Gunthorpe To: Jacob Pan Cc: "Raj, Ashok" , "Tian, Kevin" , Jean-Philippe Brucker , Alex Williamson , "Liu, Yi L" , Auger Eric , LKML , Joerg Roedel , Lu Baolu , David Woodhouse , "iommu@lists.linux-foundation.org" , "cgroups@vger.kernel.org" , Tejun Heo , Johannes Weiner , Jean-Philippe Brucker , Jonathan Corbet , "Wu, Hao" , "Jiang, Dave" Subject: Re: [PATCH V4 05/18] iommu/ioasid: Redefine IOASID set and allocation APIs Message-ID: <20210510234500.GI1002214@nvidia.com> References: <20210506122730.GQ1370958@nvidia.com> <20210506163240.GA9058@otc-nc-03> <20210510123729.GA1002214@nvidia.com> <20210510152502.GA90095@otc-nc-03> <20210510153111.GB1002214@nvidia.com> <20210510162212.GB90095@otc-nc-03> <20210510163956.GD1002214@nvidia.com> <20210510152854.793ee594@jacob-builder> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?BUp0s5BeV2Fu7aan6cme8pJEjLjmizN1izrXIo0wVMfIZNaAh6CIxsStMMhF?= =?us-ascii?Q?OwKSZz4yMD5VkbrIdogs9sq07BYP70zCsACd3eDWF0n1u9Puzrh8MsbGXoVQ?= =?us-ascii?Q?hUYhHwkYRrVwBE88kxwbechK6OqhwJiLQSbbpSyHv3gliLG4wxtDx8QpOaE1?= =?us-ascii?Q?xC9MY2L2oNTmOyVIKyZyl+vys29cPGM/2fWdNuoAt8bRe2oaeOLV8esH/1Xm?= =?us-ascii?Q?4Z2A0rUmjYVm8UQU6M14qL1xR6JEbl6+pK17gDP1+ASebzGvXqyGTlV7oZ10?= =?us-ascii?Q?1FxwqYb9qqbYBb8yUShrNoDRPI+UfIs6n+CP+gpXW140EbGfDYMX5H/Sfkzy?= =?us-ascii?Q?N8jBCLUn/Ckw9SZ+jq5LDSQBU+nxnmmYZVnWcV4wTv0QZMSU0l8kZz2TJQSz?= =?us-ascii?Q?NlGsRX9RIEYRVtTsdyFKq7EqLkYBYKGV6BPf88hcJwCNpALd8OPUObxzRzQ2?= =?us-ascii?Q?2iqNrgJnjo0HVLFjeV2alAHrAAA4qapfnLDfHg0wxdhlGWMsYh0mR46Dgfko?= =?us-ascii?Q?WIqTEeLKwEb/6Ot62yGw4PJ0jVCO5EpALz/IDTT9uX/O05v9sWfQO3JNnEW7?= =?us-ascii?Q?PjsuKvIAJpVX/raU8C31WSCmUkeP6tEP0E15XbRH6YLRJxVYL4qCm5VA1Z8S?= =?us-ascii?Q?e74x4tfMo3yBQ9isVplszufYeewnpwsKsdtTNuy2syuoeoraDiWS1+cNywEU?= =?us-ascii?Q?zAuvaIprnDke74EZdhyf0mlPJibMBGugysf5HJ96Ij5Dw243i6Il7FXfJMzV?= =?us-ascii?Q?1g4U09U2qV6FDBxSiHZd8rkzrwVvTaS6uWha1QqUn53UPbMoGMuWyHlKKQ35?= =?us-ascii?Q?9nSbtEx5vMrU5EtsufkXGg1jNx6n4xqDWGvp1TtHcAbuoXAYoXIHiDbNZhut?= =?us-ascii?Q?9nNj3+FK4DVkVk8bKXbDKgyJ+/CC6jjqGatHKPMqCgsOKnuWfKfR9BO2gA7h?= =?us-ascii?Q?6cmIDfkgtnyLO8+ayO6JUu+FvNVmkNHjk3UAWyrRuqgFSLtqByKFNIEU+gRw?= =?us-ascii?Q?EdMoYG/JLmRWxuA+LEZBMfltTEPB0jQEzh2psPDJWSLV8FJ9LYBkmZuunbDn?= =?us-ascii?Q?SH1jrS1POGSOklUtq/cJiy6KP62pJXkaSYkjqq5pI1Vp3//iZBCJiIOkZJRg?= =?us-ascii?Q?OryD0Gbe2DTIR6SqDxi5BqAH6wM6yItOR/Cdj5MBhHAkn3zCDAPw1o4PGTik?= =?us-ascii?Q?mtUg71gCLltiXWtWYEMXAfHNeF16WiBk9WPV/XfaI9euOIdjljGT8Ib9sVkX?= =?us-ascii?Q?TZ9SHcBPesUJV2Fptxl1DudkeR1FzuDHOM5bvmpkjO9o3za0kGJVmVO2ZyXr?= =?us-ascii?Q?7egJhqdz70+joWcrFrvhBy2x?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 447649ce-59bf-4c95-5af4-08d9140da0e5 X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB3834.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 May 2021 23:45:01.8080 (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: 3XhNRUt8mzrbVQl0PbldETwrxrvBuAkqSYmK5e2keHnU+/EHyXuCVzu3MbABNGhO X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB2810 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 10, 2021 at 03:28:54PM -0700, Jacob Pan wrote: > To satisfy your "give me a PASID for this RID" proposal, can we just use > the RID's struct device as the token? Also add a type field to explicitly > indicate global vs per-set(per-RID). i.e. You've got it backwards, the main behavior should be to allocate PASID per RID. The special behavior is to bundle a bunch of PASIDs into a grouping and then say the PASID number space is shared between all the group members. /dev/ioasid should create and own this grouping either implicitly or explicitly. Jumping ahead to in-kernel APIs has missed the critical step of defining the uAPI and all the behaviors together in a completed RFC proposal. 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Mon, May 10, 2021 at 03:28:54PM -0700, Jacob Pan wrote: > To satisfy your "give me a PASID for this RID" proposal, can we just use > the RID's struct device as the token? Also add a type field to explicitly > indicate global vs per-set(per-RID). i.e. You've got it backwards, the main behavior should be to allocate PASID per RID. The special behavior is to bundle a bunch of PASIDs into a grouping and then say the PASID number space is shared between all the group members. /dev/ioasid should create and own this grouping either implicitly or explicitly. Jumping ahead to in-kernel APIs has missed the critical step of defining the uAPI and all the behaviors together in a completed RFC proposal. Jason _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Subject: Re: [PATCH V4 05/18] iommu/ioasid: Redefine IOASID set and allocation APIs Date: Mon, 10 May 2021 20:45:00 -0300 Message-ID: <20210510234500.GI1002214@nvidia.com> References: <20210506122730.GQ1370958@nvidia.com> <20210506163240.GA9058@otc-nc-03> <20210510123729.GA1002214@nvidia.com> <20210510152502.GA90095@otc-nc-03> <20210510153111.GB1002214@nvidia.com> <20210510162212.GB90095@otc-nc-03> <20210510163956.GD1002214@nvidia.com> <20210510152854.793ee594@jacob-builder> Mime-Version: 1.0 Return-path: 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=x7YvY3ghFZVy/MxSq55DpMslbyjZ5dtdU4r62kwxoiA=; b=Yq7gr1UXvocILLOd/cAZX/SeIuPRzT2nlY8iA2gHlK+T+O8REUIqM67sUydNMVMQ1W2hCWb6JmMxghjM0z54FI4m7H1TN+MmpPrZuvc91T3D7OUUM/YSBkQK3Y3wc0NYxo371BOxHUkl1GX4ETN277n93RAqLwYT8EPrjuu4MdizO7soom8G1mFQbnWh7tHbmCMR6ekWFwFKOS+Rtgsi49w+nbw8SjtLnbrFzd4uil/1SJn8Ccig0q76mz9Fdqk8oi2s+WZg1RqRmFMUIBZAAt/J3diEuPzIQ0enSyKYgVSDuwjQLLg5zOgSPRN28KS+C8q54Zc2sR06Dc5XL5kWYg== Content-Disposition: inline In-Reply-To: <20210510152854.793ee594@jacob-builder> List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Jacob Pan Cc: "Raj, Ashok" , "Tian, Kevin" , Jean-Philippe Brucker , Alex Williamson , "Liu, Yi L" , Auger Eric , LKML , Joerg Roedel , Lu Baolu , David Woodhouse , "iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org" , "cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Tejun Heo , Johannes Weiner , Jean-Philippe Brucker , Jonathan Corbet , "Wu, Hao" , "Jiang, Dave" On Mon, May 10, 2021 at 03:28:54PM -0700, Jacob Pan wrote: > To satisfy your "give me a PASID for this RID" proposal, can we just use > the RID's struct device as the token? Also add a type field to explicitly > indicate global vs per-set(per-RID). i.e. You've got it backwards, the main behavior should be to allocate PASID per RID. The special behavior is to bundle a bunch of PASIDs into a grouping and then say the PASID number space is shared between all the group members. /dev/ioasid should create and own this grouping either implicitly or explicitly. Jumping ahead to in-kernel APIs has missed the critical step of defining the uAPI and all the behaviors together in a completed RFC proposal. Jason