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Mon, 10 Nov 2025 21:13:14 -0800 From: Nicolin Chen To: , , , , , CC: , , , , , , , , , , , , , , Subject: [PATCH v5 2/5] iommu: Tiny domain for iommu_setup_dma_ops() Date: Mon, 10 Nov 2025 21:12:52 -0800 Message-ID: <431cccb8279eb84376c641981f57e9ceece8febf.1762835355.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS3PEPF0000C381:EE_|DM4PR12MB5867:EE_ X-MS-Office365-Filtering-Correlation-Id: 38564999-91bb-4563-4cba-08de20e10aac X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|7416014|376014|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?zG8gvNsIyFrZrLPDUyJYLoqlzrF36NEGaemyqP3aKq77RJQZ2qF21kFRE1tm?= =?us-ascii?Q?Dx2TV7P1BJJ3mMk2Vk1i81KK/gmgZjnr0OATmVcUESJ0pM8X3o46tBn+f40o?= =?us-ascii?Q?e6ujWxiL7tCXu2OMMJ7E+0jeEm5eqUJ48jz7bfT63qvKUZu1jeMKao+/ht0D?= =?us-ascii?Q?F0Oew00FhUXkYQ+FA3ZcK6p7SYo3mYAhGtOggrhYLCUkJI6sOHAPT7Rjx3jE?= =?us-ascii?Q?8JqCFu29KyN911bLRYo6fdlK9yLZevKBSbRx9NAFAVb2Dpur+exzFMd2qrR7?= =?us-ascii?Q?JsVKqgJvaGH2LUJMyxbPTXsRZ2G/GbUbnwaW0K4WjlEEDUp0hyAZSZgjKVPz?= =?us-ascii?Q?pjPHs0B8T/spTRnI2wlhcbOZAMr7Et0g1aQ1a6pxXAwkEkKEXOByAL4fVIJ2?= =?us-ascii?Q?6ymWt+fFpusITnexhDmcd8B2HqqsGllKhPfF38AjkKt8IhIcJtEmomgtDFYL?= =?us-ascii?Q?VnMNjFzQt0zQ+t+Uw94jqGBLTZHNOnrZJWJmCQ5yQrQPRx6tJMTKfzBOyOUw?= =?us-ascii?Q?3IJwOXXhAELVEJIBRTgHL4WYNRsmIA7lhdbIeFmWJa+QCX7vqvsMmJ77NBdl?= =?us-ascii?Q?CuZS9o0Y/jRioqnLFwPLgs07UCVH5g9+v1HnvsHvPlL4pScRXe5v6UtqFd1r?= =?us-ascii?Q?OPEAn5oP7OzIKYkh6r1ed4DymXUpuVih0tbPrFc1UjPoPu+zNQ2uPokl94Pf?= =?us-ascii?Q?QN824oebwP7cJEt7Y9SYNMYarQEs3Gyz8/0/6Vk0X1Vv4sPFzYQ0hkaOayW3?= =?us-ascii?Q?VPjJoonHGn/GtjkHoS2DZLTT8S83T2IeKchldDoYDDnhfZwPuQiGK76gUv0W?= =?us-ascii?Q?HCZSyeO8kC8PoPQ7Kp+IaQi07qR29aS1YPKQnC5LO72pvT+mSdLe8GkvRB+d?= =?us-ascii?Q?OyccoorP/zV6lO4L5if7Ud3cQ7oToQRLV79OPNlQLGaPBDIfgY08Do9RUowV?= =?us-ascii?Q?w5TLinsaXKN74bal50j4GFrQIAJIZA3ahluY9XkUx0UQeHhC1ijOmdAriphu?= =?us-ascii?Q?1YskXs0As03reFyoIRK822kts+Rc7Rva0SrubohPygChRwZwNk8Aa9vGlPGI?= =?us-ascii?Q?nhLbNsZCodidRZkfXhMOYYyDB7nPcphTQIvIllpVmZu84vkufX3WhnjMYU7o?= =?us-ascii?Q?fiPYDxFc0SpaGY6Q2NSLee1qoyZsY+gWGqXUihZ4D1Ll0BGRjZRsm0K0TH5p?= =?us-ascii?Q?tIVSFTPL7EhYNpZCfHKzz11NjdXtUBVQGerhHlR+LE6ECv5hdQFWp9O1BK5g?= =?us-ascii?Q?QFYL2uEgLNdaF/aAVptUOoACjV+zHGNLRNCoIvVXeOtAfym5o8kJzUmCo0M8?= =?us-ascii?Q?xRrJe+Orvb6tQuu3XSlMze8WoxCGMP41hxIBZ9kqRW3lCj/oeln216PUhO/x?= =?us-ascii?Q?iEQd4aoV0TBGwTvQ1s+ohV5STxHU+RUfbjNnHSAyxRuhuPj/ptE8QmctT32H?= =?us-ascii?Q?3rGF2u1dJCsHXI0xzAZ4I6wcf8ahAPJvBEAgklJiLolrVZClWgBcl7DfI464?= =?us-ascii?Q?GJSxhAqtM8c0rvvPYBGs9BM4vT4lx48jgIbwtYvNXEa4f/yEeGH7FI06HywG?= =?us-ascii?Q?v0CrCSnM65X0tQpN6R8=3D?= 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)(82310400026)(1800799024)(7416014)(376014)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Nov 2025 05:13:25.0859 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 38564999-91bb-4563-4cba-08de20e10aac 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: DS3PEPF0000C381.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5867 Content-Type: text/plain; charset="utf-8" This function can only be called on the default_domain. Trivally pass it in. In all three existing cases, the default domain was just attached to the device. This avoids iommu_setup_dma_ops() calling iommu_get_domain_for_dev() the that will be used by external callers. Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/iommu/dma-iommu.h | 5 +++-- drivers/iommu/dma-iommu.c | 4 +--- drivers/iommu/iommu.c | 6 +++--- 3 files changed, 7 insertions(+), 8 deletions(-) diff --git a/drivers/iommu/dma-iommu.h b/drivers/iommu/dma-iommu.h index eca201c1f9639..040d002525632 100644 --- a/drivers/iommu/dma-iommu.h +++ b/drivers/iommu/dma-iommu.h @@ -9,7 +9,7 @@ =20 #ifdef CONFIG_IOMMU_DMA =20 -void iommu_setup_dma_ops(struct device *dev); +void iommu_setup_dma_ops(struct device *dev, struct iommu_domain *domain); =20 int iommu_get_dma_cookie(struct iommu_domain *domain); void iommu_put_dma_cookie(struct iommu_domain *domain); @@ -26,7 +26,8 @@ extern bool iommu_dma_forcedac; =20 #else /* CONFIG_IOMMU_DMA */ =20 -static inline void iommu_setup_dma_ops(struct device *dev) +static inline void iommu_setup_dma_ops(struct device *dev, + struct iommu_domain *domain) { } =20 diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 7944a3af4545e..e8ffb50c66dbf 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -2096,10 +2096,8 @@ void dma_iova_destroy(struct device *dev, struct dma= _iova_state *state, } EXPORT_SYMBOL_GPL(dma_iova_destroy); =20 -void iommu_setup_dma_ops(struct device *dev) +void iommu_setup_dma_ops(struct device *dev, struct iommu_domain *domain) { - struct iommu_domain *domain =3D iommu_get_domain_for_dev(dev); - if (dev_is_pci(dev)) dev->iommu->pci_32bit_workaround =3D !iommu_dma_forcedac; =20 diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 170e522b5bda4..1e322f87b1710 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -661,7 +661,7 @@ static int __iommu_probe_device(struct device *dev, str= uct list_head *group_list } =20 if (group->default_domain) - iommu_setup_dma_ops(dev); + iommu_setup_dma_ops(dev, group->default_domain); =20 mutex_unlock(&group->mutex); =20 @@ -1949,7 +1949,7 @@ static int bus_iommu_probe(const struct bus_type *bus) return ret; } for_each_group_device(group, gdev) - iommu_setup_dma_ops(gdev->dev); + iommu_setup_dma_ops(gdev->dev, group->default_domain); mutex_unlock(&group->mutex); =20 /* @@ -3155,7 +3155,7 @@ static ssize_t iommu_group_store_type(struct iommu_gr= oup *group, =20 /* Make sure dma_ops is appropriatley set */ for_each_group_device(group, gdev) - iommu_setup_dma_ops(gdev->dev); + iommu_setup_dma_ops(gdev->dev, group->default_domain); =20 out_unlock: mutex_unlock(&group->mutex); --=20 2.43.0