From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from DU2PR03CU002.outbound.protection.outlook.com (mail-northeuropeazon11011065.outbound.protection.outlook.com [52.101.65.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8272948F02A for ; Mon, 21 Sep 2026 11:31:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.65.65 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789990263; cv=fail; b=jOjJ0c65qDgkzn1FoUC90MqBI5Yp4Sm9qk8BQJyva3c4UPellEOiieT4IGQhcfPL+M5S3fVDWPGJtVxIJb2Th4dGVfOuYJx+O0vm8Rn2DdozLNjKlHjQL8DUx29G0/vV+EDlp08LzK9mMwkHeg0gdJ10OH5nI/jbGXw9a7EbjCY= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789990263; c=relaxed/simple; bh=Iibbbng45ESMmjQ61fyQJdKTWK9axk06X+a7mToNgQk=; h=From:Subject:Date:Message-Id:Content-Type:To:Cc:MIME-Version; b=VVgCl9BFfcT1Bc8qbHKmeTckjwMgrBQkKR0O+qbh+oFxlIdUd9ziMk0s+3Ou/F/Z7nwxBiFp/nJHF6p1ref56NH/9RQJiATgEpgPV+Lr8rg2x2FDfqswA/YJGZNq+FiCpMoVQ4u7nvb3qW+50P8d+6V7Pa318C5dohITDGkJ6no= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=oss.nxp.com; spf=pass smtp.mailfrom=oss.nxp.com; dkim=pass (2048-bit key) header.d=NXP1.onmicrosoft.com header.i=@NXP1.onmicrosoft.com header.b=s9W7jaGh; arc=fail smtp.client-ip=52.101.65.65 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=oss.nxp.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.nxp.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=NXP1.onmicrosoft.com header.i=@NXP1.onmicrosoft.com header.b="s9W7jaGh" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=TuPZzcgtJY+Zfx9dOqIVQJSL/kjFFUF5j/J/QocitsmoH/ttAth7KMaX8100D08xaKmao/zpRiVJLhQ4fKmd/gCheIWPEiIvh0FgrmEGq/LWPAgy0t/3V5/ddrlFmf4yFGSBmShhLSqCk81FfxujH5SLxpiRGghp3YLDdQBX2NLadoNexhejd1G1q5dtSq2Rd/UJJrJgqs7ARPhqlaOoeUfdlAf/havqix5You3/wDryj2XgP2JeHSN+MzVbV+ppZuuCVXr1QWiIWXvgsBDoHCEBRO/cHxUaTUSfGXYkCH061qtLigxaEWkBN6bq8w5SXjPOBrzNyPnTtWDe9IqhqA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=vfwrZ1l1xWllxNEp+4vsgJ1d4hwB5IV+M8WuKlr3+Nc=; b=nBCteG+87zFLOykWkc4TSTGfaQSQ6vEeuzb5f1+Q+AtX9jz6UCZpZSAH1j9A9YTHjUTrtpf9TedftFoVxcOmQjJUmXwONFpXsMwxC1/a7yhx+4umFJhcAFInUXfepftUAioxubBkaTNZSY76iQd0YgngW2quIpwUc7dLh80Q6iGt/Vns5sO1pKmxKCfgVu9niIlgpwYTL0ItKmOL14gribEVj/rN/k2Lcji9Ln/D3E2EyZmcpM50Njve0oQF6feAJTQA9yxSDASL5y0RMJ2O5GRzDdBceI/WAz12Yn9+QLvTm/o9brIbX01yxAPj4UobulM3WJPi7My4trS9vapfig== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oss.nxp.com; dmarc=pass action=none header.from=oss.nxp.com; dkim=pass header.d=oss.nxp.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=NXP1.onmicrosoft.com; s=selector1-NXP1-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=vfwrZ1l1xWllxNEp+4vsgJ1d4hwB5IV+M8WuKlr3+Nc=; b=s9W7jaGh9q72MSBRUcS9s/FpZ7FAPH+ScpadbZdxrIzdzB/emzlGTTuIiEeOJS9hVjpS6AkoSExxi32NNFpph9KdAgbiNF5BLhOqr+UgeQLBCcaSR6NNTJc8LQdBOHqzuXTHU5ru/vgp7PCyA7fZWgpDQ4c97ocWowDkcbvinGmDWaB3BkEk9DfgOLEQ9jQp8qS0M9pbs6V4blBAMzVGhz/1GrT5Gy0ODfw1bgGrgQRbM2zu0CAdN+uBGgMp6g3sR1GFRnm9/A01FhknqF4X0+v4wbJOH6vn65AyqYYBMJy45KRs4C/gVeUYLDRG6WjNLiWXxrVV1h4E1jw8+bVG1g== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=oss.nxp.com; Received: from AM8PR04MB7874.eurprd04.prod.outlook.com (2603:10a6:20b:24d::9) by VI0PR04MB10637.eurprd04.prod.outlook.com (2603:10a6:800:25f::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.428.16; Mon, 21 Sep 2026 11:30:55 +0000 Received: from AM8PR04MB7874.eurprd04.prod.outlook.com ([fe80::ac38:1699:6f18:c5d9]) by AM8PR04MB7874.eurprd04.prod.outlook.com ([fe80::ac38:1699:6f18:c5d9%6]) with mapi id 15.21.0428.015; Mon, 21 Sep 2026 11:30:55 +0000 From: "Peng Fan (OSS)" Subject: [PATCH RFC v2 0/4] iommu/arm-smmu-v3: Support shared Stream IDs Date: Mon, 21 Sep 2026 19:34:59 +0800 Message-Id: <20260921-smmu-shared-sid-v2-0-4b656ce68178@nxp.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAGMWsWoC/3WNwQ6CMBBEf4Xs2TUtFkRPJiZ+gFfDAdtF1qRAu kAwhH8X8OxxJm/eTCAUmATO0QSBBhZu6iXEuwhsVdQvQnZLhljFqTrpFMX7HqUqAjkUdkgmy8r UGmdKBcuqDVTyuBkfcL9dIf+V0j/fZLvVtWIVS9eEz/Y76A3+ezFoVJjo4yEziTIF0aUe271tP OTzPH8BAZUPs8MAAAA= X-Change-ID: 20260916-smmu-shared-sid-e488f6c4d4f0 To: Will Deacon , Robin Murphy , "Joerg Roedel (AMD)" , Jean-Philippe Brucker , Jason Gunthorpe Cc: linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Peng Fan X-Mailer: b4 0.16-dev-7bc12 X-ClientProxiedBy: MA1PR01CA0167.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a01:d::15) To AM8PR04MB7874.eurprd04.prod.outlook.com (2603:10a6:20b:24d::9) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM8PR04MB7874:EE_|VI0PR04MB10637:EE_ X-MS-Office365-Filtering-Correlation-Id: e81bf087-6ee7-40b5-db4d-08df17d3cce0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|376014|1800799024|366016|19092799006|10067099003|18002099003|56012099006|11063799006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AM8PR04MB7874.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(23010399003)(376014)(1800799024)(366016)(19092799006)(10067099003)(18002099003)(56012099006)(11063799006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?enlOOEpoN054Lyt1QklTU1NramRkdHhLWUc0Q2V6TXQ4K3FIei8vMTBMb2w2?= =?utf-8?B?eEVXYTBmVkEzYmx5U1JLaGUyQUxYWEcxVExPQzJiUG5QOUtRWlVBNnk1TjQ0?= =?utf-8?B?Q1d1TUcwV3V2NmhVd2ZLZjN1M05MYjkxbHVhKzdiMlp3L0FSZUNabnlpV2ty?= =?utf-8?B?cDNuMU5iT1FkMHpxT3JVQ1ZaQ1V2dzd4OEVOc3BrNVdFWFllUEp2WWZ0MjFQ?= =?utf-8?B?V3ptRkNIbEVZenVlZXdZL3l2YWR6RkpHbmdUbWQ1aktKQUk0REJ3UjVXaVA4?= =?utf-8?B?Y3d0TTJOeW42c1piYWg3ZThmbVRReFd1Y2ZIWTRkUGZ4K0dXcmEySERMRDNV?= =?utf-8?B?TzNWeUhRa0gva0NpM3lOdGllcUU3bW1qbWdKdkRWblRIaGlJMW9sN0xjVmxR?= =?utf-8?B?cXZWQXBEQlp5RHhUTW9oWVU0UVdNVnk3R0czVHZyQkNjYUREV0Q1QndubTJu?= =?utf-8?B?ZVNpYWczWHJhdTZLZCs2T2YxV2dEenh3KzBpQWRxVVh0WHV6UHN1RExzaGhM?= =?utf-8?B?eGRXQ2UvbDZVM1dnaTErVVFPbVBZbTk1ekg3clpHZEQxVTRHeWFRS2xPZi92?= =?utf-8?B?RkZ1SElBUHc1UlErdTFsY0U4MTlYSmZnMXVCMHR6dE1xT044Q1JYWUROTCtX?= =?utf-8?B?Q2RqYmJXWXVFU0VYeFRDWEpkK0swa2tIRkRPTEpwNTh5aTdmMXlSN0oyVmdS?= =?utf-8?B?KzlMdjl2cUpHYndOU3VYdGhxa0JSV01EUnpIOWxZMDB1OGs4ZVlnd3FnYzhW?= =?utf-8?B?TUhsUi8zK20zNVppampQVEJVVlF1aGxVa1ZkQmpjeGVUYzJqMEpkS0ZQVlhh?= =?utf-8?B?TGd5ejBZQUdwMFRkdnNJbDAzSG42UVNwdFl2MDc2SnlBRk0rMnF0Nzd5NTlQ?= =?utf-8?B?MCtRbGpZMFhjMks0VkFhQWgwcnhJZDBJZENsRzV5K21DMTJMamZ5WlBXVWs4?= =?utf-8?B?MnNmdHJvV0ZtMGtHRkplcjBUZXNnQ0xEZDJjZjc5VG5qWFZCZXVUYnlsM2ho?= =?utf-8?B?eFRzKzFVemlqS2FZcHpRQjlYd0tkMmxXMGlreGQyS09aN2xQZ3AxK01xKzBK?= =?utf-8?B?M0lEdEtScFZldkUyMExuWVZEZDRqTWtZNEVYSzk5dGlOQUQvdVp3eWE5bGRH?= =?utf-8?B?ODJjc1hSRXhxNDk3a0gweGFHVHJ5L2Rabk41MGlqNGxxVWJTcmtFajh5VmZH?= =?utf-8?B?V2JoNkdmSzdPQ0ZuaFN6ekFkb25Zci9PNEVLN1U1OXRvaDgwR05ROTRoc1kr?= =?utf-8?B?UytxbjF4blZBa3ZmYllyeUUwQTk5RUF6RStRbU9iSHJrdFZHYVNCOFI1Zys2?= =?utf-8?B?OFRkTCthR0VqZmhLOURuK01HZXoyN3RpRklBZUQ4bm03a2xJY2pjMmlTVVNU?= =?utf-8?B?ckFNZnIwVUlVM2wrSVFBdHNwN01jRmF3VDhPcDgwMldMNW9lUStVQjZDNUhP?= =?utf-8?B?T2ZHeXBmSmdJNXFoZllHZFVGcmFaSUYyNTRPOEJLdjNJeTRmUFhkdjRhRS9n?= =?utf-8?B?Qm1EdTF1dll5YzNFYXFqK3FHN3hUSHo2dkF5WE1icFVaajl0RFpFRFRIZUdo?= =?utf-8?B?dG1rY08rcDUrSDdkRjR6bGRkWmI2TDZ3dkwzTlMwL0xHdVdiZnN0QmxaczUz?= =?utf-8?B?RlF1TGs1SDMxR1p0a0NHaEVERVF3OTRNeUc2TnRxcDNmSkNBOC9BSEd5Zm5V?= =?utf-8?B?Zlg0WEZXSXA0TUlFTGJyZFg2TjlUVGdFaUltejU2Uk9GcEd5Z3p1ZGdoMzVr?= =?utf-8?B?OGhKZnFBRmw0SERJQWFTYVE5UXlaeHdNWExQM2ZtTXR6Z3JmZnUrQ2hsbjdX?= =?utf-8?B?aENpMFdjdDg1ZGFSQ0Y5QkVTK2hTSE1vM2VOTHZYaVpzWjA5eFdUUEhWTG9W?= =?utf-8?B?WVIrbEhyLzd0ZVZUYkpnU1JkdDNQZ3NpRFBXWnNpazRqbWdkVjFUdzJtZW9K?= =?utf-8?B?S0VhL0NQWE9TckVlN003c3RVdENLbHhSb0VhQjZLblVqZUhJNHVYYzFuQ3Jk?= =?utf-8?B?WXNKQk9sTGltVXNzN0YwMUJYUHZZZUxCTmZkTVhBcW1yQm40V0hSenV6TW51?= =?utf-8?B?SVA4QWZkb0FGckhvdzBGK1B3S0dLQ3hRVFJzS09GMFozWWc5SHdHR3Iyamd3?= =?utf-8?B?L1BsOVdNZGxwZHJ0enZpc0E1Z0s5N0cxWW5FbGJ5dHBEQVJ2OVZuQmxyUFFi?= =?utf-8?B?eGQwQ09RRDdCaS90dHloWW4ySGlPVnppY2NTN2pUT3hHWjBYcWNENmlJczE4?= =?utf-8?B?OVpBZU13MFJCZGxaVmFuRUFxVHphb0d5Z3lpQ3NNY1kzZDlhNkhYOVdkRldw?= =?utf-8?B?THpnRFgzVi9OenlQWWswSnFZdzdXUmlxc21JYXRDNXU0c0RCRTNlR0x2eFdB?= =?utf-8?Q?h0g4phShDj+VEz6TAjRzh4GafBYYCmBhTSgR5?= X-OriginatorOrg: oss.nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: e81bf087-6ee7-40b5-db4d-08df17d3cce0 X-MS-Exchange-CrossTenant-AuthSource: AM8PR04MB7874.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Sep 2026 11:30:55.6338 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: fC7LX7Cv2IZuwn7VTBskvA5Yf5kFLeZntVv+V+luGtDSXT+5e08XOl5OS1SBHSUJBVsXl2xrp1P63qaEVE3E7HAe8KTv9u72rGrlywkt4HdValir88Kvr96THpA+t3TP X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI0PR04MB10637 Some SoCs have a limited number of IOMMU Stream IDs (SIDs) and hardware that inherently shares them. For example, the NXP i.MX95 only has 64 SIDs, only 6 bits for SID in the system chip bus. However there are many device IPs, such as SDHC, PCIE, NETC, GPU, NPU, Display, VPU, ISP, ISI, JPEG, SATA, DMA and etc. Each Kind IP has mutilple instances inside the SoC. So I introudce this patchset to support shared SID. The current ARM SMMUv3 driver rejects this with: "Aliasing StreamID unsupported, expect DMA to be broken" I took comments in [1] and implement this patchset and only want to support a very simple case that multiple platform devices share one SID. Patch 1 converts the streams RB tree to an XArray for O(1) SID lookup, simplifying duplicate-SID handling. Patch 2 adds reference counting to streams so that multiple masters can share a SID. Insert increments the refcount; remove either transfers ownership or decrements. A per-SID linked list tracks co-sharing masters. Patch 3 places devices that share a SID into the same IOMMU group, ensuring they share a single IOMMU domain. Patch 4 wires up STE write ordering (first master writes, last master tears down) and gates features that require unambiguous SID-to-device mapping: SVA, IOPF/stall, and vSMMU nesting are disabled for shared-SID masters. [1] https://lore.kernel.org/linux-iommu/DU0PR04MB94172CB3F138AD39E9B6DEEF887F9@DU0PR04MB9417.eurprd04.prod.outlook.com/ Signed-off-by: Peng Fan --- Changes in v2: - Only update cover-letter to make it clear about why introducing shared SID - Link to v1: https://patch.msgid.link/20260916-smmu-shared-sid-v1-0-517384504aee@nxp.com --- Peng Fan (4): iommu/arm-smmu-v3: Convert streams from RB tree to XArray iommu/arm-smmu-v3: Support shared SIDs in insert/remove_master iommu/arm-smmu-v3: Group aliasing devices into the same IOMMU group iommu/arm-smmu-v3: Wire up shared-SID STE ordering and feature gating .../iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 4 +- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 7 + drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 265 ++++++++++++++++----- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 34 ++- 4 files changed, 247 insertions(+), 63 deletions(-) --- base-commit: e6e35979777d646fe3c7c94dca7dd32fb25d45f4 change-id: 20260916-smmu-shared-sid-e488f6c4d4f0 Best regards, -- Peng Fan