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Thu, 12 May 2022 17:33:18 -0700 From: Nicolin Chen To: , , , CC: , , Subject: [PATCH] iommu/vt-d: Try info->iommu in device_to_iommu() Date: Thu, 12 May 2022 17:32:33 -0700 Message-ID: <20220513003233.4442-1-nicolinc@nvidia.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 0d5b000b-5aa5-4006-5efb-08da34782e3e X-MS-TrafficTypeDiagnostic: BN9PR12MB5291:EE_ X-Microsoft-Antispam-PRVS: 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:12.22.5.235;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230001)(4636009)(40470700004)(46966006)(36840700001)(5660300002)(86362001)(426003)(316002)(110136005)(6666004)(40460700003)(186003)(36756003)(47076005)(336012)(70586007)(4326008)(70206006)(8676002)(356005)(1076003)(2616005)(54906003)(81166007)(4744005)(8936002)(36860700001)(26005)(508600001)(7696005)(82310400005)(2906002)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 May 2022 00:33:20.1655 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0d5b000b-5aa5-4006-5efb-08da34782e3e X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.235];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT059.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN9PR12MB5291 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Local boot test and VFIO sanity test show that info->iommu can be used in device_to_iommu() as a fast path. So this patch adds it. Signed-off-by: Nicolin Chen --- drivers/iommu/intel/iommu.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 2990f80c5e08..412fca5ab9cd 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -777,6 +777,7 @@ static bool iommu_is_dummy(struct intel_iommu *iommu, s= truct device *dev) struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn) { struct dmar_drhd_unit *drhd =3D NULL; + struct device_domain_info *info; struct pci_dev *pdev =3D NULL; struct intel_iommu *iommu; struct device *tmp; @@ -786,6 +787,10 @@ struct intel_iommu *device_to_iommu(struct device *dev= , u8 *bus, u8 *devfn) if (!dev) return NULL; =20 + info =3D dev_iommu_priv_get(dev); + if (info) + return info->iommu; + if (dev_is_pci(dev)) { struct pci_dev *pf_pdev; =20 --=20 2.17.1