iommu: Add ops->domain_alloc_sva()
Make a new op that receives the device and the mm_struct that the SVA domain should be created for. Unlike domain_alloc_paging() the dev argument is never NULL here. This allows drivers to fully initialize the SVA domain and allocate the mmu_notifier during allocation. It allows the notifier lifetime to follow the lifetime of the iommu_domain. Since we have only one call site, upgrade the new op to return ERR_PTR instead of NULL. Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> [Removed smmu3 related changes - Vasant] Signed-off-by: Vasant Hegde <vasant.hegde@amd.com> Reviewed-by: Tina Zhang <tina.zhang@intel.com> Link: https://lore.kernel.org/r/20240418103400.6229-15-vasant.hegde@amd.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -108,8 +108,8 @@ struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm
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/* Allocate a new domain and set it on device pasid. */
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domain = iommu_sva_domain_alloc(dev, mm);
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if (!domain) {
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ret = -ENOMEM;
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if (IS_ERR(domain)) {
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ret = PTR_ERR(domain);
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goto out_free_handle;
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}
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@ -283,9 +283,15 @@ struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
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const struct iommu_ops *ops = dev_iommu_ops(dev);
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struct iommu_domain *domain;
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domain = ops->domain_alloc(IOMMU_DOMAIN_SVA);
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if (!domain)
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return NULL;
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if (ops->domain_alloc_sva) {
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domain = ops->domain_alloc_sva(dev, mm);
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if (IS_ERR(domain))
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return domain;
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} else {
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domain = ops->domain_alloc(IOMMU_DOMAIN_SVA);
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if (!domain)
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return ERR_PTR(-ENOMEM);
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}
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domain->type = IOMMU_DOMAIN_SVA;
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mmgrab(mm);
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@ -518,6 +518,7 @@ static inline int __iommu_copy_struct_from_user_array(
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* Upon failure, ERR_PTR must be returned.
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* @domain_alloc_paging: Allocate an iommu_domain that can be used for
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* UNMANAGED, DMA, and DMA_FQ domain types.
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* @domain_alloc_sva: Allocate an iommu_domain for Shared Virtual Addressing.
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* @probe_device: Add device to iommu driver handling
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* @release_device: Remove device from iommu driver handling
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* @probe_finalize: Do final setup work after the device is added to an IOMMU
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@ -558,6 +559,8 @@ struct iommu_ops {
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struct device *dev, u32 flags, struct iommu_domain *parent,
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const struct iommu_user_data *user_data);
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struct iommu_domain *(*domain_alloc_paging)(struct device *dev);
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struct iommu_domain *(*domain_alloc_sva)(struct device *dev,
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struct mm_struct *mm);
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struct iommu_device *(*probe_device)(struct device *dev);
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void (*release_device)(struct device *dev);
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