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Fri, 27 Jan 2023 14:51:44 -0800 Date: Fri, 27 Jan 2023 14:51:42 -0800 From: Nicolin Chen To: Robin Murphy CC: , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH 2/4] iommu/dma: Do not init domain if broken_unmanaged_domain Message-ID: References: <451e7beb57ec6de66ee0da5b38886105436f53d7.1674849118.git.nicolinc@nvidia.com> <89da64c8-fef4-2cea-f15c-86264073500c@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <89da64c8-fef4-2cea-f15c-86264073500c@arm.com> X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF0000EE3C:EE_|DS0PR12MB7899:EE_ X-MS-Office365-Filtering-Correlation-Id: 24c33fe0-2cc5-4206-f232-08db00b918b5 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:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230025)(4636009)(396003)(39860400002)(136003)(346002)(376002)(451199018)(40470700004)(46966006)(36840700001)(47076005)(82310400005)(55016003)(86362001)(40480700001)(40460700003)(356005)(33716001)(36860700001)(54906003)(7416002)(82740400003)(7636003)(4744005)(2906002)(70206006)(8936002)(41300700001)(4326008)(186003)(8676002)(5660300002)(6916009)(9686003)(53546011)(70586007)(26005)(316002)(426003)(478600001)(336012);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jan 2023 22:51:58.4552 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 24c33fe0-2cc5-4206-f232-08db00b918b5 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0000EE3C.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB7899 Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org On Fri, Jan 27, 2023 at 09:59:50PM +0000, Robin Murphy wrote: > External email: Use caution opening links or attachments > > > On 2023-01-27 20:04, Nicolin Chen wrote: > > Add a sanity of the broken_unmanaged_domain flag to reject the use of > > dma-iommu in the early stage, if the flag is set by the iommu driver. > > Realistically, iommu-dma will never be enabled on PPC32, let alone used. > It will not be enabled on ARM until I've fixed any drivers which need > fixing to work with it. We don't need to add dead code here. OK. Sounds like I can drop this patch. Thanks Nicolin