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dkim=none (message not signed) header.d=none;intel.com; dmarc=none action=none header.from=nvidia.com; Received: from BL0PR12MB5506.namprd12.prod.outlook.com (2603:10b6:208:1cb::22) by BL1PR12MB5094.namprd12.prod.outlook.com (2603:10b6:208:312::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4544.15; Tue, 28 Sep 2021 11:57:52 +0000 Received: from BL0PR12MB5506.namprd12.prod.outlook.com ([fe80::e8af:232:915e:2f95]) by BL0PR12MB5506.namprd12.prod.outlook.com ([fe80::e8af:232:915e:2f95%8]) with mapi id 15.20.4544.022; Tue, 28 Sep 2021 11:57:52 +0000 Date: Tue, 28 Sep 2021 08:57:51 -0300 From: Jason Gunthorpe To: "Tian, Kevin" Cc: "Liu, Yi L" , "alex.williamson@redhat.com" , "hch@lst.de" , "jasowang@redhat.com" , "joro@8bytes.org" , "jean-philippe@linaro.org" , "parav@mellanox.com" , "lkml@metux.net" , "pbonzini@redhat.com" , "lushenming@huawei.com" , "eric.auger@redhat.com" , "corbet@lwn.net" , "Raj, Ashok" , "yi.l.liu@linux.intel.com" , "Tian, Jun J" , "Wu, Hao" , "Jiang, Dave" , "jacob.jun.pan@linux.intel.com" , "kwankhede@nvidia.com" , "robin.murphy@arm.com" , "kvm@vger.kernel.org" , "iommu@lists.linux-foundation.org" , "dwmw2@infradead.org" , "linux-kernel@vger.kernel.org" , "baolu.lu@linux.intel.com" , "david@gibson.dropbear.id.au" , "nicolinc@nvidia.com" Subject: Re: [RFC 06/20] iommu: Add iommu_device_init[exit]_user_dma interfaces Message-ID: <20210928115751.GK964074@nvidia.com> References: <20210919063848.1476776-1-yi.l.liu@intel.com> <20210919063848.1476776-7-yi.l.liu@intel.com> <20210921170943.GS327412@nvidia.com> <20210922123931.GI327412@nvidia.com> <20210927150928.GA1517957@nvidia.com> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?agddrfMPxWsa3SXNME758HxHUm4BCVYfKZuxHL66Ep/RcImbNrvDYe1h2Lqx?= =?us-ascii?Q?t6FE/JuWhpfbSOeRJ85n6tGjL+IuM+/piM1/ZYHpKFhQXZUbYzHph3fvuUAi?= =?us-ascii?Q?4X7NHX8B/ZJv1Nk1xOWL49QU+K90R11ha95HzFJnLmXlXt8vSgU9RzL9+X8q?= =?us-ascii?Q?ZZYQ8p5jspodedKj0EKlZ0pFw2OHUlllH43RTrfr4Qo15LywMWsQ157qphY6?= =?us-ascii?Q?oRBiQDr11+thY9wciZbXVeKq6uQkC5AY/I42U7PBHARdRUCtxlzOOOC3EMN2?= =?us-ascii?Q?unjFTdldKXY8ls9YnNVTNiLFjzWgsK8nbK10i7RSqBSX9UAmhlI6RBNPkdhp?= =?us-ascii?Q?IyG1gGM9Gx/yowPBHuX8mCIN7kFAJPRj2xOPRIy406pz3pBzht3iXxneiP63?= =?us-ascii?Q?C4fuUKTrz4SvX71A5aSNGm/HHy/g4eNSp66cGyPyDcTF6FyMsrLsytlWw72F?= =?us-ascii?Q?3Md7JEk/A8ooodJaJ0cPyYbtX0nFsXPlPVwJ5WOCKonckPgdTIy+tX6ID7NI?= =?us-ascii?Q?mhb30aIZEADHTOKFgpcodJF7yoowtGpMLWjgQ738sQfxZAPtXBx9rXDDbdo0?= =?us-ascii?Q?2NqyDn7c8txkzjomIA6gkgFjT5vw5w487ZCiUbgH83vT2+cjrzBLeqqVxspO?= =?us-ascii?Q?E5/P55k1mTo7mHg8NyZnPwlp8bdIwguxgTztsGg2JjHUMys0vASkq/2Y79oS?= =?us-ascii?Q?EZEKUVdzU8HHzC1Uh95atZNX8aHCi2Mml18n4id8/RF0FSyHtH81SS+W5d8L?= =?us-ascii?Q?yFH5Xje+RTtYUN403YwFZsTV5Ra5/+uXQAKtKV3t2eoMeNS3DAmeM3rg/NUO?= =?us-ascii?Q?47D6QQee1rTqBLMeGxGcYPx/KIq5j7eB8TAqHbgFhVJ665wQNkipJadL1xyu?= =?us-ascii?Q?EJ2cP/jfom2t/OD+EYWi4tWxjG9cgx+kvDAI9U4nH+rWl5C/+5KYzRajO6X6?= =?us-ascii?Q?Y2LKaHIkBFpfpVk60/Bb2nwWODuwjumcfWYoyPdJxsb+rAEuWHVptOR2zc9r?= =?us-ascii?Q?pK9J7HrDIMG3zLKkD4yLeicPrt5WeEOlg/hnnixJceiOruKNvObdB4N3K3Ey?= =?us-ascii?Q?sqjt/jV+TUfp63mXU+FQcHLkah2w4GchGTiZeZxF4lzFt7EIDeSkJtsTJBmB?= =?us-ascii?Q?WSJApOhoFJ9e8USxKDzzU5MeYxSTOTeDU6zMvQadYUZA/XyRRTIBJPRavvBf?= =?us-ascii?Q?fXzRitQvuTc4QgWYWpec+M9+NINHB66KQ5QOB70t0YowJwkLxK8IWfUKb8nG?= =?us-ascii?Q?i4XqkVV+X/fuWr9wCNxsJ6IdgNJStASNau5gWbx/bxEpiK1oSPJTuiK0FGbp?= =?us-ascii?Q?+7YwfxAbfCksClAEnpkmXRh8?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: eda9f959-26ef-482a-21b9-08d982773341 X-MS-Exchange-CrossTenant-AuthSource: BL0PR12MB5506.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Sep 2021 11:57:52.5228 (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: 2PeZtLW8N/aJZ68m+l01JxbNlgHxoPdgZ5kxIz/qgW+L1GDSiop8VNYAYbCCGZFy X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5094 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Sep 28, 2021 at 07:30:41AM +0000, Tian, Kevin wrote: > > Also, don't call it "hint", there is nothing hinty about this, it has > > definitive functional impacts. > > possibly dma_mode (too broad?) or dma_usage You just need a flag to specify if the driver manages DMA ownership itself, or if it requires the driver core to setup kernel ownership DMA_OWNER_KERNEL DMA_OWNER_DRIVER_CONTROLLED ? There is a bool 'suprress_bind_attrs' already so it could be done like this: bool suppress_bind_attrs:1; /* If set the driver must call iommu_XX as the first action in probe() */ bool suppress_dma_owner:1; Which is pretty low cost. 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Tue, Sep 28, 2021 at 07:30:41AM +0000, Tian, Kevin wrote: > > Also, don't call it "hint", there is nothing hinty about this, it has > > definitive functional impacts. > > possibly dma_mode (too broad?) or dma_usage You just need a flag to specify if the driver manages DMA ownership itself, or if it requires the driver core to setup kernel ownership DMA_OWNER_KERNEL DMA_OWNER_DRIVER_CONTROLLED ? There is a bool 'suprress_bind_attrs' already so it could be done like this: bool suppress_bind_attrs:1; /* If set the driver must call iommu_XX as the first action in probe() */ bool suppress_dma_owner:1; Which is pretty low cost. Jason _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu