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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?KsobCXYHfKtagi0I8FrNMxloYKVmWb7++YJzSmEHInEpHxeAfOAk0uZLyip9?= =?us-ascii?Q?q4rYX2I37okn+uEyR1zLRdGUbGvMiUK/cFzIIzoVrHr+06lDF1r428qfGuAo?= =?us-ascii?Q?1CVrt7dsiIGEzVdzAfaLTaicOnHpmLqkXTaJC0Us6D1fYjEGYkRT6A8YxMY4?= =?us-ascii?Q?3w24U3/+vdQFe86MlqPWhCrGQ3NX08OJXGcQoGWL97ngnAmtGy8mzNwTRUCf?= =?us-ascii?Q?5RIIFpdckZ91V8HnIaStP1l7/gcBAAM8d9QZGiVN1eapn6DwmvTbTj7h2xOB?= =?us-ascii?Q?hAxVUigP49fGFLalc0i3E1BruPbucANFYSPs+AQVCerI0xfCe+muUVSaLRjL?= =?us-ascii?Q?NX7X//U7UUD8MuomkgICdkhhP0WgQOCGzV16gsBnWS2X4RNqAA6lTRpvrJ1E?= =?us-ascii?Q?PRNiXcNKrm7Ujfzyy2FS66qrmnxs4bdyJhnLDEiXZsIXwwskIqpYZpe66rse?= =?us-ascii?Q?0hv+eUbe7vuOrtWGQmywtTmQ/1+h00010VCDm8ocWwaKm7Z5yXJCNfsTZAXK?= =?us-ascii?Q?Sdg0lNIN7JEtJ7BOF7ElBEnJmZeDBtlnGIp3Jo2j+6j2yIUAX5oP5L1/Wof6?= =?us-ascii?Q?lKgXp2/xIfOGkd+t/xzCDOvNUIDBGbON7JoL1eWxAew2n5Z1q0k+gjf2ETW/?= =?us-ascii?Q?tEd7CabTEUtpG7EVdh0W3ZubaLW3cF+lLGfCMqIIW+QEckwQaM7jenkv5aRf?= =?us-ascii?Q?hQpTxiFWIy2VLVENRUzh2QHBLCbg5A0B5aPWRgRl5Cf+4XxVtPsQsFEZUcy5?= =?us-ascii?Q?KjzCGYhA5QVK+DEnD5A8liNJlnAb9wNh4Ypx7irduRJ4pZuOv/AmNHlXCzSj?= =?us-ascii?Q?oFSt9EMBfr51FjzEiJRSnLmcHHisBrsvh4EjO/TZTkcElA7cJTF2v42tKr8K?= =?us-ascii?Q?Hgu8zX2gvEx/MnCz8p5oMCMMOnDnZLBP71DAi5nQe0PgfwRRs/J3ZKAdYpDN?= =?us-ascii?Q?Lv4BD/yLiPtcFkt7ovJ2LVf9kXWGat3EJ/Qa1gWFkG7ci1YSw7q4V2GDrTlF?= =?us-ascii?Q?XQ+U98/ulWoRwkSiREA0tUjfopTy7PfUjY5U4jBD/3dBnMKHcvJD3mok+kNb?= =?us-ascii?Q?mzibi+bsqIi/i7GJNEG4vwVqjDOLMzREXQp0KMYqlf/gHwhCPuilJyxQXGZp?= =?us-ascii?Q?KPwE5Mkv1l21ScnaoWpT9gAx8YCdRI0AwcCXNZSxJlkJ+ZkgDbSwmh8MWPBU?= =?us-ascii?Q?oXMh6yNeUeIe58r/XUWmQQzkG7GoWdC5S6aK0aLLELzewvXeRewiUGK6WDv1?= =?us-ascii?Q?4CVC5dDBQ6AV+/NNsAufkCd+ZhBdeDNvGjwyjzKNcP1ysoy1Cy7xvCnL7cSy?= =?us-ascii?Q?nIEp3q15+LWH8ibojW+Ukj05m/doZMAeLTewg+49YIV+1JR6XJu8zhfUuOsI?= =?us-ascii?Q?NDQdYbp1gVreOTzeMc1tp5YHpo6WFXvVTY+uUlgYbmW3bYpww55PJKHdjLdF?= =?us-ascii?Q?7hmbpqeXruTtgCR5C2t/+mEA53xNcRlPo/T4/Vk06lj35eIxlJrHcu2iucG5?= =?us-ascii?Q?gH8WtwsVkk9wfuXYGbtVx60Ai9BKpfpTvVWgdTllMZQZutnqXqLFVRcI4z5E?= =?us-ascii?Q?oqfd6H8hrcnEguTKOkThd4y5Wru58yh9kRfemPOM?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8f62ee06-1e84-434b-4c69-08dbf1135688 X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Nov 2023 19:42:36.2401 (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: E0QmGN9y2YOavYDho7ySA3AclKi/DhasMU0iRgettny7l2S0SfD+1t07059vQ7cJ X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6491 On Tue, Nov 28, 2023 at 09:49:39AM +0000, Shameer Kolothum wrote: > From: Joao Martins > > Dirty tracking will always be enabled with DBM=1 modifier enabled > by default when HD is supported. Is this trying to say that ARM doesn't have a per-table global enable for dirty tracking but instead pre-sets the DBM bit to avoid the cost? So on smmuv3 to enable we have to clear everything and disable continues to pay a penalty since we don't go and mark all things as dirty again? 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Received: from LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) by PH7PR12MB6491.namprd12.prod.outlook.com (2603:10b6:510:1f4::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7025.27; Wed, 29 Nov 2023 19:42:36 +0000 Received: from LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::60d4:c1e3:e1aa:8f93]) by LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::60d4:c1e3:e1aa:8f93%4]) with mapi id 15.20.7046.015; Wed, 29 Nov 2023 19:42:36 +0000 Date: Wed, 29 Nov 2023 15:42:35 -0400 From: Jason Gunthorpe To: Shameer Kolothum Cc: iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, robin.murphy@arm.com, will@kernel.org, joro@8bytes.org, kevin.tian@intel.com, nicolinc@nvidia.com, mshavit@google.com, eric.auger@redhat.com, joao.m.martins@oracle.com, jiangkunkun@huawei.com, zhukeqian1@huawei.com, linuxarm@huawei.com Subject: Re: [PATCH 4/5] iommu/arm-smmu-v3: Add set_dirty_tracking() support Message-ID: <20231129194235.GC436702@nvidia.com> References: <20231128094940.1344-1-shameerali.kolothum.thodi@huawei.com> <20231128094940.1344-5-shameerali.kolothum.thodi@huawei.com> Content-Disposition: inline In-Reply-To: <20231128094940.1344-5-shameerali.kolothum.thodi@huawei.com> X-ClientProxiedBy: DS7PR03CA0084.namprd03.prod.outlook.com (2603:10b6:5:3bb::29) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|PH7PR12MB6491:EE_ X-MS-Office365-Filtering-Correlation-Id: 8f62ee06-1e84-434b-4c69-08dbf1135688 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Nov 28, 2023 at 09:49:39AM +0000, Shameer Kolothum wrote: > From: Joao Martins > > Dirty tracking will always be enabled with DBM=1 modifier enabled > by default when HD is supported. Is this trying to say that ARM doesn't have a per-table global enable for dirty tracking but instead pre-sets the DBM bit to avoid the cost? So on smmuv3 to enable we have to clear everything and disable continues to pay a penalty since we don't go and mark all things as dirty again? Jason _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel