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Tue, 22 Sep 2026 10:47:04 -0700 Date: Tue, 22 Sep 2026 10:47:02 -0700 From: Nicolin Chen To: Robin Murphy CC: Peng Fan , , , , , , , , Subject: Re: [PATCH RFC v2 2/4] iommu/arm-smmu-v3: Support shared SIDs in insert/remove_master Message-ID: References: <20260921-smmu-shared-sid-v2-0-4b656ce68178@nxp.com> <20260921123846.1663580-1-peng.fan@oss.nxp.com> <31be5621-92f6-4101-898f-806335d56155@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <31be5621-92f6-4101-898f-806335d56155@arm.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH1PEPF0000AD80:EE_|CH0PR12MB8531:EE_ X-MS-Office365-Filtering-Correlation-Id: c5a5f58d-e3a4-4051-dc30-08df18d1932f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700016|82310400026|7416014|376014|23010399003|18002099003|22082099003|11063799006|10067099003|4143699003|56012099006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 5OD6U2uFaYWqZF0A8wRHkY5Z6wyrrR+nB5Q5lUfW4b+BpC9uDu9DNgaKz1CSqP7LKGcvCVWnw1qJjoKCNVavzRmnzEigkDX02D5ygxkJcjoxcQBytLZpOSs2iG8ki6RAWknMvIkWe3RbyuSgiTMgtgpFqtPxX4LsztF8/tC1zC4n6UqmZ2r56K9lST2M9JhdQCUmN5zhtdJpByGmR/qSWFx9naIFwzQqxp2P6yzImd3QSpyAYQ2HW7jAiPw/bFMhEJOtNKuxCzyfLgEi8EY+iDMunfljfQwa9eZKWkex+GheNRv//L+mZ5TwM91RF7HqRhOtzG2o/HS3fS6SvVx0AYkuvV3HYpbdIbk8+A8sDNRGko8ck2IJ+q3tCo2JlgmAH4GA46SKJTHQQeAY30dfAFzBW4DGEe9v6z7Q207fiH1rC+cNuPWH3pfRl+M33ydp X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Sep 2026 17:47:30.4864 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c5a5f58d-e3a4-4051-dc30-08df18d1932f 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: CH1PEPF0000AD80.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR12MB8531 On Tue, Sep 22, 2026 at 04:52:35PM +0100, Robin Murphy wrote: > On 22/09/2026 3:13 pm, Peng Fan wrote: > > On Mon, Sep 21, 2026 at 04:15:18PM -0700, Nicolin Chen wrote: > > > Does i.MX need to support SID-sharing with multi-SD device? If not, > > > the master could have only a simple shared_masters_elm: > > > > For i.MX, there is no need to support SID sharing for multi-SID device for now. > > Not sure, in future there are cases that needs SID sharing for multi-SID device. > > I have a system meeting those conditions :) > > Specifically, I have a physical PCIe-to-PCI bridge board with a couple of > ancient cards plugged into it (such that they each end up with their own RID > plus the common bridge alias RID) just in case I ever got round to looking > at this myself... Though in such cases we cannot reject num_streams != 1 any more, that bridge can still end up with one single shared stream, e.g. alias = PCI_DEVID(0x02, PCI_DEVFN(0,0)) = 0x0200 Card A = 02:01.0 -> sorted SIDs { 0x0200, 0x0208 } Card B = 02:02.0 -> sorted SIDs { 0x0200, 0x0210 } ? Hopefully, we won't have to support an ancient PCIe-to-PCI bridge connecting with another ancient PCI-to-PCI bridge... Nicolin