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Wed, 5 Apr 2023 23:26:21 -0700 From: Nicolin Chen To: , , CC: , , , , , , , , , Subject: [PATCH RFC v1 3/3] iommu/arm-smmu-v3: Implement set_rid_user and unset_rid_user Date: Wed, 5 Apr 2023 23:25:36 -0700 Message-ID: <2f00c7faa5c8ddfb4b94e85d3c5af7a0fa8df35d.1680762112.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: References: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT039:EE_|MN0PR12MB6056:EE_ X-MS-Office365-Filtering-Correlation-Id: b7f1a9c2-1c8d-410f-e396-08db3667dff7 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:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230028)(4636009)(376002)(396003)(346002)(39860400002)(136003)(451199021)(40470700004)(46966006)(36840700001)(478600001)(8676002)(70206006)(110136005)(316002)(70586007)(54906003)(6666004)(4326008)(7636003)(2906002)(82310400005)(40460700003)(5660300002)(356005)(7416002)(41300700001)(8936002)(40480700001)(82740400003)(36860700001)(86362001)(7696005)(2616005)(26005)(426003)(336012)(47076005)(36756003)(186003)(83380400001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Apr 2023 06:26:36.8278 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b7f1a9c2-1c8d-410f-e396-08db3667dff7 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT039.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB6056 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230405_232639_915688_CF78553C X-CRM114-Status: GOOD ( 14.57 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Implement the new set_rid_user and unset_rid_user ops, by using an xarray to store the stream pointer indexed by a given user space Stream ID. This will be used by user cache invalidation hypercall, to check the SID field of an ATC_INV command and replace it with the corresponding physical SID. Signed-off-by: Nicolin Chen --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 45 +++++++++++++++++++++ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 2 + 2 files changed, 47 insertions(+) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index f2425b0f0cd6..17bb90e78547 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -2843,6 +2843,48 @@ static void arm_smmu_remove_dev_pasid(struct device *dev, ioasid_t pasid) arm_smmu_sva_remove_dev_pasid(domain, dev, pasid); } +static int arm_smmu_set_rid_user(struct device *dev, u32 rid, u32 rid_base) +{ + struct arm_smmu_master *master = dev_iommu_priv_get(dev); + struct arm_smmu_stream *stream = &master->streams[0]; + struct arm_smmu_device *smmu = master->smmu; + u32 sid_user = rid_base | rid; + int ret = 0; + + if (!sid_user) + return -EINVAL; + + ret = xa_alloc(&smmu->streams_user, &sid_user, stream, + XA_LIMIT(sid_user, sid_user), GFP_KERNEL_ACCOUNT); + if (ret) + return ret; + stream->id_user = sid_user; + return 0; +} + +static int arm_smmu_unset_rid_user(struct device *dev) +{ + struct arm_smmu_master *master = dev_iommu_priv_get(dev); + struct arm_smmu_stream *stream = &master->streams[0]; + struct arm_smmu_device *smmu = master->smmu; + u32 sid_user = stream->id_user; + + if (!sid_user) + return -ENODEV; + + xa_lock(&smmu->streams_user); + stream = __xa_erase(&smmu->streams_user, sid_user); + if (stream != master->streams) { + WARN_ON(__xa_alloc(&smmu->streams_user, &sid_user, stream, + XA_LIMIT(sid_user, sid_user), + GFP_KERNEL_ACCOUNT)); + xa_unlock(&smmu->streams_user); + return -EINVAL; + } + xa_unlock(&smmu->streams_user); + return 0; +} + static struct iommu_ops arm_smmu_ops = { .capable = arm_smmu_capable, .domain_alloc = arm_smmu_domain_alloc, @@ -2854,6 +2896,8 @@ static struct iommu_ops arm_smmu_ops = { .remove_dev_pasid = arm_smmu_remove_dev_pasid, .dev_enable_feat = arm_smmu_dev_enable_feature, .dev_disable_feat = arm_smmu_dev_disable_feature, + .set_rid_user = arm_smmu_set_rid_user, + .unset_rid_user = arm_smmu_unset_rid_user, .page_response = arm_smmu_page_response, .def_domain_type = arm_smmu_def_domain_type, .pgsize_bitmap = -1UL, /* Restricted during device attach */ @@ -3082,6 +3126,7 @@ static int arm_smmu_init_structures(struct arm_smmu_device *smmu) mutex_init(&smmu->streams_mutex); smmu->streams = RB_ROOT; + xa_init_flags(&smmu->streams_user, XA_FLAGS_ALLOC1 | XA_FLAGS_ACCOUNT); ret = arm_smmu_init_queues(smmu); if (ret) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h index 8d772ea8a583..8ccea2e84bbb 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -674,10 +674,12 @@ struct arm_smmu_device { struct rb_root streams; struct mutex streams_mutex; + struct xarray streams_user; }; struct arm_smmu_stream { u32 id; + u32 id_user; struct arm_smmu_master *master; struct rb_node node; };