From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F3496CAC5AE for ; Wed, 24 Sep 2025 19:50:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:CC:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=2oBpGgDS95TyjRKAYYsveDWakkdeaUW0HUI+NzeuZPs=; b=E0mGjpy0HqYLhf y/XCZbXqis1T0BAF/CIbuBMIso6QiOlkVlib0zZaJSIYXNburbapXQqGQoCmiT45nG4Qm61k5WysS HtmH5KuRCKMnwLf6wlN5x2ctcX05QjJHAdZjYq+kb+eGbPopKxtSkC2V/RU6k7RC68gg/k0trRBPQ zb9oGr6Rn8l/+BNyLlq5hcJjDuFy0ZKXSaDtQiPErvdlK3JN8Ie9htxsOR4fq2OBZ5PjLAAfKCAvA L+/3wj10hOoJOc21UOxQKtU0OR+hEQVBKUtQqaSZgiNCsXqk1Esx5PX0oEPpncQErrJB0mveBLryR ghWJfcfQcZY5Ia0MVvtw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v1VUu-00000003D9p-1NEF; Wed, 24 Sep 2025 19:49:52 +0000 Received: from mail-southcentralusazlp170110003.outbound.protection.outlook.com ([2a01:111:f403:c10d::3] helo=SN4PR0501CU005.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1v1VUs-00000003D6c-08oA; Wed, 24 Sep 2025 19:49:51 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=QP74wjyMpG7CyoQVWPXy57k69ABlVI4FVrW/OFVvV3BLO95/kKVCe0BkfxAAYVndNrZ7K23XYOq5OyoFyN31c061qkIjla+/BvQlzu8EgYIz7j0iP7FbyewVyBHOPMd0+C2FWEpS8DesWP0iz+cI5NX8yOw2kRxLQim9erD7Yl+150drCPomXHh583xueFl/DArh8SEiq4xgEuDO2oRZke51jVQ+kLFaSlGEPyMJNQ7hjsukegQ/12rmTh+EBdxk/Iqk9qykUgaf4VRgnolAu05wtBNms/cbK0m1o9TB1/JqDrmNYZXhJKpun46NuvfmYUao5+Fx/eOyjnpeZk12XQ== 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=ekVtrLWsRZLj/GYerixv4vut0tchd9bN6RaTKZCS6Po=; b=xpFq5Kf1dRq//5H6Ab/YcNWhH6VFKQX6Qik2egh7rUaQlGf629GVCM4VNzAhuqjBncGYmu3KjsNG/CFnvxjhrZEv8HQuxz1JfndZ+uWsLoh3zmwnLrbD4CPkQP/XReRKDa/dIfIUW3wjqjvO+y2BvmfGlUUFuJJK1qocbQxqY/rvab6sAnY+PJMn9XKk/beAT9T4Go5B+v9p6+xJ9tn33VxGcncb9GTyfPo5JBC2Ihd8hz5wlSwSKgKiOdBYTY8//KVTA+mRwfudN0oxEC2t+TEob36D7GvbVU+6gmZShM2NGmM1OzTOlVO0cq3WCmkMl+6k5cbvWv6nuaZTm3/NBg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.117.160) smtp.rcpttodomain=csie.org smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ekVtrLWsRZLj/GYerixv4vut0tchd9bN6RaTKZCS6Po=; b=fMGTUwuVhqyUOaA3LfrM3+y7fa1CFcs2F/wW2dXb4DE+204nbDoa5r5l42SS9oq2mM6N8bENMtN4HSHAr7P7Ff4ByV5rhaOllacw6SCgzuyxWoynH2Q8tTkKktQqaovb3lyXI8P9peXUb9R4UvuYGvnyxv87N8EiIquT4BWonVKzi/RUaPXbqgj91M0H9KCHBFG5oppEhTBmYirapqgQC+YK3ywJXR2Jnmqj8Tj/SqTbfgFrBEBuj23Q0ZMOIGbO06C+f/RGKgaY/St9X+BCyVO2CVxxeReOZ21THQGZZ1Csm6+AEF0ZnTldk38cLJxa2upXH15xXqOARoGUHbrRyA== Received: from MN2PR04CA0029.namprd04.prod.outlook.com (2603:10b6:208:d4::42) by SN7PR12MB6742.namprd12.prod.outlook.com (2603:10b6:806:26e::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9137.19; Wed, 24 Sep 2025 19:49:35 +0000 Received: from BN1PEPF0000468D.namprd05.prod.outlook.com (2603:10b6:208:d4:cafe::cf) by MN2PR04CA0029.outlook.office365.com (2603:10b6:208:d4::42) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9137.21 via Frontend Transport; Wed, 24 Sep 2025 19:49:35 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.117.160) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.160 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.160) by BN1PEPF0000468D.mail.protection.outlook.com (10.167.243.138) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9160.9 via Frontend Transport; Wed, 24 Sep 2025 19:49:34 +0000 Received: from rnnvmail205.nvidia.com (10.129.68.10) by mail.nvidia.com (10.129.200.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.34; Wed, 24 Sep 2025 12:49:19 -0700 Received: from rnnvmail201.nvidia.com (10.129.68.8) by rnnvmail205.nvidia.com (10.129.68.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.14; Wed, 24 Sep 2025 12:49:19 -0700 Received: from Asurada-Nvidia (10.127.8.11) by mail.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20 via Frontend Transport; Wed, 24 Sep 2025 12:49:15 -0700 Date: Wed, 24 Sep 2025 12:49:14 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v4 5/7] iommu: Add iommu_get_domain_for_dev_locked() helper Message-ID: References: <20250924191055.GJ2617119@nvidia.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20250924191055.GJ2617119@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF0000468D:EE_|SN7PR12MB6742:EE_ X-MS-Office365-Filtering-Correlation-Id: 53345ca9-0bca-475c-21c4-08ddfba37cdc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|376014|7416014|82310400026|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?2VvThKy+Z0dKW+vZ3SCGnO1B0cWZ57HA6LzpcQUizmOexU4qFkdZk5B5mTjk?= =?us-ascii?Q?rPc1tSTgpGGrInmMwxQY3LqzfGOFS5Ai5iWHhO8YewdiRbgnV//c8UJewvO2?= =?us-ascii?Q?hvSxdUjfPgorCNdu+G1XtPtuKo08b2NcrLyKBHtYNrjC8sfvG9qzDy9wTXPW?= =?us-ascii?Q?9zZ++lHMvsUjKwhdYwC9P4MQzzQasWvnUr6tZpESX7Ait/gbg2Lrb8JMjy5g?= =?us-ascii?Q?x+MgyYZzRKp2lPfxqc6dN2pRN9d3iUi7XMaaPdvt04ZjIyCfJKs3AaaMdxrg?= =?us-ascii?Q?o+EPd6+2eYOBzYZq0zcYfVGfc54K/NW/oCol2/PYpKV9grM7EkG4GRsIxGr/?= =?us-ascii?Q?8Z9SfwQ/prUUQ4l8M3goSSnFVncgDDerSiH2XwKBL+PIC9svSUySD7UsTI1r?= =?us-ascii?Q?pgexKKRydRUbWmvtqD5iO7NANzvTJojWMsip1ipQaNr/jFSmguD8Co54raB6?= =?us-ascii?Q?JA5mvOd158KIDt74X6UkkeWnwFnTjUhoX/Ua8O0X39ggDbMB9PuB6h3olq+O?= =?us-ascii?Q?o6YIkTTfxdMK+GX7AIxK/9YR4S7eTloBtV38YFU209eQzu0BNvJT9WjgWYAq?= =?us-ascii?Q?PubLbX1+fHl/SYOoQSMxd/zdwyx4GWSyTNmMYCGdIjXjJnrAIxG+Db1j7PwU?= =?us-ascii?Q?atOEElXj7vzDOwYHWKcjCd6BAv4yxsdgFH0S8Ako+k8x5tWvZMAfS6MAEuYf?= =?us-ascii?Q?XhXBPiecBm/50kf3l8gc1XAkufghvZ0a7GpeIkDZSrhNbZF6jJDXlvtZWoRH?= =?us-ascii?Q?6bsppMc6w51VMO49GNuazC7HKgmk0380uF+GJ4qft6iPdEdJMjPpxWQAF2k8?= =?us-ascii?Q?x5rrdAyj71Ym7zMoJh1oTyGUTV4qdlyMidSZLF9blOyNRhst9fSxoD1amr81?= =?us-ascii?Q?CoeqGXORPSULbUctv9DPfY9rrvAzXGymdKx2pe9Rt0sjhZAl7jam7K1TO/LI?= =?us-ascii?Q?i5DDcBIuAzMOtGj31uZeoXuFb+jC3RRMzLdsxwlRppEVFOPGr7J4cIPVmydt?= =?us-ascii?Q?z79LCWO9ZBXS/49WB7eDNocHBnc7S/5s931fPf8pT6iU0j+U08Izb83SQXeS?= =?us-ascii?Q?knunoyAApldtOA/ETOKXTCnh3R7jotUU4HvF4RvEJckdhii/cb3nRKs0EAM6?= =?us-ascii?Q?8VgAmIGFd4vB2GDyvAfVYGetZgd6KMj3Ht+nPkL/dk925xZsmD9nCG+Kws2c?= =?us-ascii?Q?4iWzR8YA4//EQhyjQ3j32T9EMu1FdAyJeTbaOnf/Gmkm8/ObR2VMtHUoNOgQ?= =?us-ascii?Q?rpepsxyICGQtqYjxaMy0nqkd/aXn/QRmfiQYcvljbs72YP+itr5ZXFQgj4EF?= =?us-ascii?Q?5LhCRAHzULHM3aGU73sjS9la69QXMp4uvd15aJC2aJbvkIPPYaDVXUsyMDoX?= =?us-ascii?Q?3wrANC9uHCIank9+AcOUqBae4eqKIS38Ky6CnB8AwXYZ3horYuewL0YKOHpb?= =?us-ascii?Q?HJeXA7J7g3+Hl59GeeeNbfOlzxHO9oSB+T18Y108KNW9NHRPRAHgArCDM8Lt?= =?us-ascii?Q?Ez+j1u0qzjY7GBzmzAixmxabnG0kj5LAorGV?= 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:(13230040)(36860700013)(376014)(7416014)(82310400026)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Sep 2025 19:49:34.8043 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 53345ca9-0bca-475c-21c4-08ddfba37cdc 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: BN1PEPF0000468D.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6742 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250924_124950_081891_2C130193 X-CRM114-Status: GOOD ( 22.07 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Wed, Sep 24, 2025 at 04:10:55PM -0300, Jason Gunthorpe wrote: > On Sun, Aug 31, 2025 at 04:31:57PM -0700, Nicolin Chen wrote: > > diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c > > index ea2ef53bd4fef..99680cdb57265 100644 > > --- a/drivers/iommu/dma-iommu.c > > +++ b/drivers/iommu/dma-iommu.c > > @@ -2097,7 +2097,7 @@ EXPORT_SYMBOL_GPL(dma_iova_destroy); > > > > void iommu_setup_dma_ops(struct device *dev) > > { > > - struct iommu_domain *domain = iommu_get_domain_for_dev(dev); > > + struct iommu_domain *domain = iommu_get_domain_for_dev_locked(dev); > > Lets have another patch to tidy this. This function can only be called on > the default_domain. We can trivally pass it in. In all three cases the > default domain was just attached to the device. Will replace with your patch. > > +/* Caller must be a general/external function that isn't an IOMMU callback */ > > struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) > > Maybe a kdoc? > > /** > * iommu_get_domain_for_dev() - Return the DMA API domain pointer > * @dev - Device to query > * > * This function can be called within a driver bound to dev. The returned > * pointer is valid for the lifetime of the bound driver. > * > * It should not be called by drivers with driver_managed_dma = true. > */ > struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) Will add this. > I really wanted to say this should just always return the > default_domain, but it looks like host1x_client_iommu_detach() is the > only place outside the iommu drivers that would be unhappy with that. I suppose any external user that allocates/attaches a domain has a risk of potentially using this helper, in which case group->domain may not be default_domain? Thanks Nicolin _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv