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Received: from LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) by PH0PR12MB7886.namprd12.prod.outlook.com (2603:10b6:510:26e::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6954.21; Fri, 3 Nov 2023 16:45:04 +0000 Received: from LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::b53a:1092:9be2:cfb9]) by LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::b53a:1092:9be2:cfb9%4]) with mapi id 15.20.6933.027; Fri, 3 Nov 2023 16:45:04 +0000 From: Jason Gunthorpe To: acpica-devel@lists.linuxfoundation.org, Alyssa Rosenzweig , Albert Ou , asahi@lists.linux.dev, Lu Baolu , Catalin Marinas , Dexuan Cui , devicetree@vger.kernel.org, David Woodhouse , Frank Rowand , Hanjun Guo , Haiyang Zhang , Christoph Hellwig , iommu@lists.linux.dev, Jean-Philippe Brucker , Jonathan Hunter , Joerg Roedel , "K. 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. 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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: Allow fwspec to exist independently from the dev->iommu by providing functions to allow allocating and freeing the raw struct iommu_fwspec. Reflow the existing paths to call the new alloc/dealloc functions. 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 Allow fwspec to exist independently from the dev->iommu by providing functions to allow allocating and freeing the raw struct iommu_fwspec. Reflow the existing paths to call the new alloc/dealloc functions. Signed-off-by: Jason Gunthorpe Reviewed-by: Jerry Snitselaar --- drivers/iommu/iommu.c | 82 ++++++++++++++++++++++++++++++++----------- include/linux/iommu.h | 11 +++++- 2 files changed, 72 insertions(+), 21 deletions(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index d5e86985f6d363..46f3d19a1291b0 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -361,10 +361,8 @@ static void dev_iommu_free(struct device *dev) struct dev_iommu *param = dev->iommu; dev->iommu = NULL; - if (param->fwspec) { - fwnode_handle_put(param->fwspec->iommu_fwnode); - kfree(param->fwspec); - } + if (param->fwspec) + iommu_fwspec_dealloc(param->fwspec); kfree(param); } @@ -2937,10 +2935,61 @@ const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) return ops; } +static int iommu_fwspec_assign_iommu(struct iommu_fwspec *fwspec, + struct device *dev, + struct fwnode_handle *iommu_fwnode) +{ + const struct iommu_ops *ops; + + if (fwspec->iommu_fwnode) { + /* + * fwspec->iommu_fwnode is the first iommu's fwnode. In the rare + * case of multiple iommus for one device they must point to the + * same driver, checked via same ops. + */ + ops = iommu_ops_from_fwnode(iommu_fwnode); + if (fwspec->ops != ops) + return -EINVAL; + return 0; + } + + if (!fwspec->ops) { + ops = iommu_ops_from_fwnode(iommu_fwnode); + if (!ops) + return driver_deferred_probe_check_state(dev); + fwspec->ops = ops; + } + + of_node_get(to_of_node(iommu_fwnode)); + fwspec->iommu_fwnode = iommu_fwnode; + return 0; +} + +struct iommu_fwspec *iommu_fwspec_alloc(void) +{ + struct iommu_fwspec *fwspec; + + fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL); + if (!fwspec) + return ERR_PTR(-ENOMEM); + return fwspec; +} + +void iommu_fwspec_dealloc(struct iommu_fwspec *fwspec) +{ + if (!fwspec) + return; + + if (fwspec->iommu_fwnode) + fwnode_handle_put(fwspec->iommu_fwnode); + kfree(fwspec); +} + int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, const struct iommu_ops *ops) { struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); + int ret; if (fwspec) return ops == fwspec->ops ? 0 : -EINVAL; @@ -2948,29 +2997,22 @@ int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, if (!dev_iommu_get(dev)) return -ENOMEM; - fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL); - if (!fwspec) - return -ENOMEM; + fwspec = iommu_fwspec_alloc(); + if (IS_ERR(fwspec)) + return PTR_ERR(fwspec); - of_node_get(to_of_node(iommu_fwnode)); - fwspec->iommu_fwnode = iommu_fwnode; fwspec->ops = ops; + ret = iommu_fwspec_assign_iommu(fwspec, dev, iommu_fwnode); + if (ret) { + iommu_fwspec_dealloc(fwspec); + return ret; + } + dev_iommu_fwspec_set(dev, fwspec); return 0; } EXPORT_SYMBOL_GPL(iommu_fwspec_init); -void iommu_fwspec_free(struct device *dev) -{ - struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); - - if (fwspec) { - fwnode_handle_put(fwspec->iommu_fwnode); - kfree(fwspec); - dev_iommu_fwspec_set(dev, NULL); - } -} -EXPORT_SYMBOL_GPL(iommu_fwspec_free); int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids) { diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 66ea1d08dc3f58..b827dd6a5844b0 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -683,9 +683,18 @@ struct iommu_sva { struct iommu_domain *domain; }; +struct iommu_fwspec *iommu_fwspec_alloc(void); +void iommu_fwspec_dealloc(struct iommu_fwspec *fwspec); + int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, const struct iommu_ops *ops); -void iommu_fwspec_free(struct device *dev); +static inline void iommu_fwspec_free(struct device *dev) +{ + if (!dev->iommu) + return; + iommu_fwspec_dealloc(dev->iommu->fwspec); + dev->iommu->fwspec = NULL; +} int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids); const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);