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Wysocki" , Rob Herring Subject: [PATCH v2 17/17] iommu: Mark dev_iommu_priv_set() with a lockdep Date: Wed, 15 Nov 2023 10:06:08 -0400 Message-ID: <17-v2-36a0088ecaa7+22c6e-iommu_fwspec_jgg@nvidia.com> In-Reply-To: <0-v2-36a0088ecaa7+22c6e-iommu_fwspec_jgg@nvidia.com> References: X-ClientProxiedBy: MN2PR11CA0028.namprd11.prod.outlook.com (2603:10b6:208:23b::33) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|PH8PR12MB6916:EE_ X-MS-Office365-Filtering-Correlation-Id: 3f8cf913-e808-4457-e104-08dbe5e4051b X-LD-Processed: 43083d15-7273-40c1-b7db-39efd9ccc17a,ExtAddr 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:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:LV2PR12MB5869.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(39860400002)(376002)(346002)(396003)(366004)(136003)(230922051799003)(1800799009)(64100799003)(186009)(451199024)(110136005)(316002)(66946007)(54906003)(66476007)(66556008)(6486002)(478600001)(6666004)(7366002)(86362001)(5660300002)(7406005)(7416002)(921008)(41300700001)(2906002)(36756003)(8676002)(4326008)(8936002)(2616005)(38100700002)(26005)(83380400001)(6506007)(6512007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3f8cf913-e808-4457-e104-08dbe5e4051b X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Nov 2023 14:06:10.6128 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: jYB4zXZxebzO9WEXDZ4ZJaJRplN3TWVB05TDh50kBnIo457V1UZKTVQEx6vynJQn X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB6916 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231115_060621_218702_EB3700BB X-CRM114-Status: GOOD ( 17.14 ) X-Spam-Score: 0.6 (/) X-Spam-Report: Spam detection software, running on the system "bombadil.infradead.org", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: A perfect driver would only call dev_iommu_priv_set() from its probe callback. We've made it functionally correct to call it from the of_xlate by adding a lock around that call. lockdep assert that iommu_probe_device_lock is held to discourage misuse. Content analysis details: (0.6 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 SPF_NONE SPF: sender does not publish an SPF Record -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 1.0 FORGED_SPF_HELO No description available. -0.2 DKIMWL_WL_HIGH DKIMwl.org - High trust sender X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org A perfect driver would only call dev_iommu_priv_set() from its probe callback. We've made it functionally correct to call it from the of_xlate by adding a lock around that call. lockdep assert that iommu_probe_device_lock is held to discourage misuse. Exclude PPC kernels with CONFIG_FSL_PAMU turned on because FSL_PAMU uses a global static for its priv and abuses priv for its domain. Remove the pointless stores of NULL, all these are on paths where the core code will free dev->iommu after the op returns. Reviewed-by: Lu Baolu Reviewed-by: Jerry Snitselaar Signed-off-by: Jason Gunthorpe --- drivers/iommu/amd/iommu.c | 2 -- drivers/iommu/apple-dart.c | 1 - drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 1 - drivers/iommu/arm/arm-smmu/arm-smmu.c | 1 - drivers/iommu/intel/iommu.c | 2 -- drivers/iommu/iommu.c | 9 +++++++++ drivers/iommu/omap-iommu.c | 1 - include/linux/iommu.h | 5 +---- 8 files changed, 10 insertions(+), 12 deletions(-) diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index fcc987f5d4edc3..8199c678c2dc2a 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -551,8 +551,6 @@ static void amd_iommu_uninit_device(struct device *dev) if (dev_data->domain) detach_device(dev); - dev_iommu_priv_set(dev, NULL); - /* * We keep dev_data around for unplugged devices and reuse it when the * device is re-plugged - not doing so would introduce a ton of races. diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c index ee05f4824bfad1..56cfc33042e0b5 100644 --- a/drivers/iommu/apple-dart.c +++ b/drivers/iommu/apple-dart.c @@ -740,7 +740,6 @@ static void apple_dart_release_device(struct device *dev) { struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev); - dev_iommu_priv_set(dev, NULL); kfree(cfg); } 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 b1309f04ebc0d9..df81fcd25a75b0 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -2698,7 +2698,6 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev) err_free_master: kfree(master); - dev_iommu_priv_set(dev, NULL); return ERR_PTR(ret); } diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c index 8c4a60d8e5d522..6fc040a4168aa3 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c @@ -1423,7 +1423,6 @@ static void arm_smmu_release_device(struct device *dev) arm_smmu_rpm_put(cfg->smmu); - dev_iommu_priv_set(dev, NULL); kfree(cfg); } diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 3531b956556c7d..4a5792888e6433 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -4457,7 +4457,6 @@ static struct iommu_device *intel_iommu_probe_device(struct device *dev) ret = intel_pasid_alloc_table(dev); if (ret) { dev_err(dev, "PASID table allocation failed\n"); - dev_iommu_priv_set(dev, NULL); kfree(info); return ERR_PTR(ret); } @@ -4475,7 +4474,6 @@ static void intel_iommu_release_device(struct device *dev) dmar_remove_one_dev_info(dev); intel_pasid_free_table(dev); intel_iommu_debugfs_remove_dev(info); - dev_iommu_priv_set(dev, NULL); kfree(info); set_dma_ops(dev, NULL); } diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 34c4b07a6aafae..fbfb9ba4da0ee2 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -387,6 +387,15 @@ static u32 dev_iommu_get_max_pasids(struct device *dev) return min_t(u32, max_pasids, dev->iommu->iommu_dev->max_pasids); } +void dev_iommu_priv_set(struct device *dev, void *priv) +{ + /* FSL_PAMU does something weird */ + if (!IS_ENABLED(CONFIG_FSL_PAMU)) + lockdep_assert_held(&iommu_probe_device_lock); + dev->iommu->priv = priv; +} +EXPORT_SYMBOL_GPL(dev_iommu_priv_set); + /* * Init the dev->iommu and dev->iommu_group in the struct device and get the * driver probed. Take ownership of fwspec, it always freed on error diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c index c66b070841dd41..c9528065a59afa 100644 --- a/drivers/iommu/omap-iommu.c +++ b/drivers/iommu/omap-iommu.c @@ -1719,7 +1719,6 @@ static void omap_iommu_release_device(struct device *dev) if (!dev->of_node || !arch_data) return; - dev_iommu_priv_set(dev, NULL); kfree(arch_data); } diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 3495db0c3e4631..8be153a54c8ca2 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -852,10 +852,7 @@ static inline void *dev_iommu_priv_get(struct device *dev) return NULL; } -static inline void dev_iommu_priv_set(struct device *dev, void *priv) -{ - dev->iommu->priv = priv; -} +void dev_iommu_priv_set(struct device *dev, void *priv); int iommu_probe_device_fwspec(struct device *dev, struct iommu_fwspec *fwspec); static inline int iommu_probe_device(struct device *dev)