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iommu: Add iommu_paging_domain_alloc() interface
Commit <17de3f5fdd35> ("iommu: Retire bus ops") removes iommu ops from bus. The iommu subsystem no longer relies on bus for operations. So the bus parameter in iommu_domain_alloc() is no longer relevant. Add a new interface named iommu_paging_domain_alloc(), which explicitly indicates the allocation of a paging domain for DMA managed by a kernel driver. The new interface takes a device pointer as its parameter, that better aligns with the current iommu subsystem. Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: Vasant Hegde <vasant.hegde@amd.com> Link: https://lore.kernel.org/r/20240610085555.88197-2-baolu.lu@linux.intel.com Signed-off-by: Will Deacon <will@kernel.org>
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@ -2016,6 +2016,10 @@ static int __iommu_domain_alloc_dev(struct device *dev, void *data)
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return 0;
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}
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/*
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* The iommu ops in bus has been retired. Do not use this interface in
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* new drivers.
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*/
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struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
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{
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const struct iommu_ops *ops = NULL;
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@ -2032,6 +2036,22 @@ struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
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}
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EXPORT_SYMBOL_GPL(iommu_domain_alloc);
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/**
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* iommu_paging_domain_alloc() - Allocate a paging domain
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* @dev: device for which the domain is allocated
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*
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* Allocate a paging domain which will be managed by a kernel driver. Return
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* allocated domain if successful, or a ERR pointer for failure.
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*/
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struct iommu_domain *iommu_paging_domain_alloc(struct device *dev)
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{
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if (!dev_has_iommu(dev))
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return ERR_PTR(-ENODEV);
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return __iommu_domain_alloc(dev_iommu_ops(dev), dev, IOMMU_DOMAIN_UNMANAGED);
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}
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EXPORT_SYMBOL_GPL(iommu_paging_domain_alloc);
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void iommu_domain_free(struct iommu_domain *domain)
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{
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if (domain->type == IOMMU_DOMAIN_SVA)
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@ -780,6 +780,7 @@ extern bool iommu_present(const struct bus_type *bus);
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extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
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extern bool iommu_group_has_isolated_msi(struct iommu_group *group);
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extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus);
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struct iommu_domain *iommu_paging_domain_alloc(struct device *dev);
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extern void iommu_domain_free(struct iommu_domain *domain);
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extern int iommu_attach_device(struct iommu_domain *domain,
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struct device *dev);
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@ -1086,6 +1087,11 @@ static inline struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus
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return NULL;
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}
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static inline struct iommu_domain *iommu_paging_domain_alloc(struct device *dev)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline void iommu_domain_free(struct iommu_domain *domain)
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{
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}
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