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Y. Srinivasan" , Len Brown , linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org, linux-snps-arc@lists.infradead.org, linux-tegra@vger.kernel.org, Russell King , Lorenzo Pieralisi , Marek Szyprowski , Hector Martin , Palmer Dabbelt , Paul Walmsley , "Rafael J. Wysocki" , Robert Moore , Rob Herring , Robin Murphy , Sudeep Holla , Suravee Suthikulpanit , Sven Peter , Thierry Reding , Thomas Bogendoerfer , Krishna Reddy , Vineet Gupta , virtualization@lists.linux-foundation.org, Wei Liu , Will Deacon Cc: Zhenhua Huang Subject: [PATCH RFC 08/17] of: Do not use dev->iommu within of_iommu_configure() Date: Fri, 3 Nov 2023 13:44:53 -0300 Message-ID: <8-v1-5f734af130a3+34f-iommu_fwspec_jgg@nvidia.com> In-Reply-To: <0-v1-5f734af130a3+34f-iommu_fwspec_jgg@nvidia.com> References: X-ClientProxiedBy: MN2PR19CA0012.namprd19.prod.outlook.com (2603:10b6:208:178::25) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|CH3PR12MB9282:EE_ X-MS-Office365-Filtering-Correlation-Id: b193e492-f904-4bf5-68f7-08dbdc8c3b4e 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; 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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: b193e492-f904-4bf5-68f7-08dbdc8c3b4e X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Nov 2023 16:45:05.3495 (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: +mF6DIjDPMwXyxDxk/3dMRCQ4ga1CGzLQFonP9dIq8kRfgTSBJqAUnayvoWsTHIc X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB9282 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231103_094519_801911_DF926B7A X-CRM114-Status: GOOD ( 19.23 ) 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 This call chain is using dev->iommu->fwspec to pass around the fwspec between the three parts (of_iommu_configure(), of_iommu_xlate(), iommu_probe_device()). However there is no locking around the accesses to dev->iommu, so this is all racy. Allocate a clean, local, fwspec at the start of of_iommu_configure(), pass it through all functions on the stack to fill it with data, and finally pass it into iommu_probe_device_fwspec() which will load it into dev->iommu under a lock. Move the actual call to ops->of_xlate into the core code under iommu_fwspec_of_xlate(). Signed-off-by: Jason Gunthorpe Reviewed-by: Jerry Snitselaar --- drivers/iommu/iommu.c | 29 ++++++++++++++ drivers/iommu/of_iommu.c | 82 +++++++++++++++++----------------------- include/linux/iommu.h | 3 ++ 3 files changed, 67 insertions(+), 47 deletions(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 36561c9fbf6859..ad2963d69a0538 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2990,6 +2990,35 @@ static int iommu_fwspec_assign_iommu(struct iommu_fwspec *fwspec, return 0; } +int iommu_fwspec_of_xlate(struct iommu_fwspec *fwspec, struct device *dev, + struct fwnode_handle *iommu_fwnode, + struct of_phandle_args *iommu_spec) +{ + int ret; + + ret = iommu_fwspec_assign_iommu(fwspec, dev, iommu_fwnode); + if (ret) + return ret; + + if (!fwspec->ops->of_xlate) + return -ENODEV; + + if (!dev_iommu_get(dev)) + return -ENOMEM; + + /* + * ops->of_xlate() requires the fwspec to be passed through dev->iommu, + * set it temporarily. + */ + if (dev->iommu->fwspec && dev->iommu->fwspec != fwspec) + iommu_fwspec_dealloc(dev->iommu->fwspec); + dev->iommu->fwspec = fwspec; + ret = fwspec->ops->of_xlate(dev, iommu_spec); + if (dev->iommu->fwspec == fwspec) + dev->iommu->fwspec = NULL; + return ret; +} + struct iommu_fwspec *iommu_fwspec_alloc(void) { struct iommu_fwspec *fwspec; diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index 4f77495a2543ea..b232a6909e0d45 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -19,40 +19,19 @@ #define NO_IOMMU -ENODEV -static int of_iommu_xlate(struct device *dev, +static int of_iommu_xlate(struct iommu_fwspec *fwspec, struct device *dev, struct of_phandle_args *iommu_spec) { - const struct iommu_ops *ops; - struct fwnode_handle *fwnode = &iommu_spec->np->fwnode; - int ret; - - ops = iommu_ops_from_fwnode(fwnode); - if ((ops && !ops->of_xlate) || - !of_device_is_available(iommu_spec->np)) + if (!of_device_is_available(iommu_spec->np)) return NO_IOMMU; - ret = iommu_fwspec_init(dev, &iommu_spec->np->fwnode, ops); - if (ret) - return ret; - /* - * The otherwise-empty fwspec handily serves to indicate the specific - * IOMMU device we're waiting for, which will be useful if we ever get - * a proper probe-ordering dependency mechanism in future. - */ - if (!ops) - return driver_deferred_probe_check_state(dev); - - if (!try_module_get(ops->owner)) - return -ENODEV; - - ret = ops->of_xlate(dev, iommu_spec); - module_put(ops->owner); - return ret; + return iommu_fwspec_of_xlate(fwspec, dev, &iommu_spec->np->fwnode, + iommu_spec); } -static int of_iommu_configure_dev_id(struct device_node *master_np, - struct device *dev, - const u32 *id) +static int of_iommu_configure_dev_id(struct iommu_fwspec *fwspec, + struct device_node *master_np, + struct device *dev, const u32 *id) { struct of_phandle_args iommu_spec = { .args_count = 1 }; int err; @@ -63,12 +42,13 @@ static int of_iommu_configure_dev_id(struct device_node *master_np, if (err) return err == -ENODEV ? NO_IOMMU : err; - err = of_iommu_xlate(dev, &iommu_spec); + err = of_iommu_xlate(fwspec, dev, &iommu_spec); of_node_put(iommu_spec.np); return err; } -static int of_iommu_configure_dev(struct device_node *master_np, +static int of_iommu_configure_dev(struct iommu_fwspec *fwspec, + struct device_node *master_np, struct device *dev) { struct of_phandle_args iommu_spec; @@ -77,7 +57,7 @@ static int of_iommu_configure_dev(struct device_node *master_np, while (!of_parse_phandle_with_args(master_np, "iommus", "#iommu-cells", idx, &iommu_spec)) { - err = of_iommu_xlate(dev, &iommu_spec); + err = of_iommu_xlate(fwspec, dev, &iommu_spec); of_node_put(iommu_spec.np); idx++; if (err) @@ -90,6 +70,7 @@ static int of_iommu_configure_dev(struct device_node *master_np, struct of_pci_iommu_alias_info { struct device *dev; struct device_node *np; + struct iommu_fwspec *fwspec; }; static int of_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data) @@ -97,14 +78,16 @@ static int of_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data) struct of_pci_iommu_alias_info *info = data; u32 input_id = alias; - return of_iommu_configure_dev_id(info->np, info->dev, &input_id); + return of_iommu_configure_dev_id(info->fwspec, info->np, info->dev, + &input_id); } -static int of_iommu_configure_device(struct device_node *master_np, +static int of_iommu_configure_device(struct iommu_fwspec *fwspec, + struct device_node *master_np, struct device *dev, const u32 *id) { - return (id) ? of_iommu_configure_dev_id(master_np, dev, id) : - of_iommu_configure_dev(master_np, dev); + return (id) ? of_iommu_configure_dev_id(fwspec, master_np, dev, id) : + of_iommu_configure_dev(fwspec, master_np, dev); } /* @@ -117,19 +100,15 @@ static int of_iommu_configure_device(struct device_node *master_np, int of_iommu_configure(struct device *dev, struct device_node *master_np, const u32 *id) { - struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); + struct iommu_fwspec *fwspec; int err; if (!master_np) return -ENODEV; - if (fwspec) { - if (fwspec->ops) - return 0; - - /* In the deferred case, start again from scratch */ - iommu_fwspec_free(dev); - } + fwspec = iommu_fwspec_alloc(); + if (IS_ERR(fwspec)) + return PTR_ERR(fwspec); /* * We don't currently walk up the tree looking for a parent IOMMU. @@ -140,27 +119,36 @@ int of_iommu_configure(struct device *dev, struct device_node *master_np, struct of_pci_iommu_alias_info info = { .dev = dev, .np = master_np, + .fwspec = fwspec, }; pci_request_acs(); err = pci_for_each_dma_alias(to_pci_dev(dev), of_pci_iommu_init, &info); } else { - err = of_iommu_configure_device(master_np, dev, id); + err = of_iommu_configure_device(fwspec, master_np, dev, id); } if (err == -ENODEV || err == -EPROBE_DEFER) - return err; + goto err_free; if (err) goto err_log; - err = iommu_probe_device(dev); - if (err) + err = iommu_probe_device_fwspec(dev, fwspec); + if (err) { + /* + * Ownership for fwspec always passes into + * iommu_probe_device_fwspec() + */ + fwspec = NULL; goto err_log; + } return 0; err_log: dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); +err_free: + iommu_fwspec_dealloc(fwspec); return err; } diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 531382d692d71a..2644c61b572b8f 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -685,6 +685,9 @@ struct iommu_sva { struct iommu_fwspec *iommu_fwspec_alloc(void); void iommu_fwspec_dealloc(struct iommu_fwspec *fwspec); +int iommu_fwspec_of_xlate(struct iommu_fwspec *fwspec, struct device *dev, + struct fwnode_handle *iommu_fwnode, + struct of_phandle_args *iommu_spec); int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, const struct iommu_ops *ops);