iommu: Implement generic_iommu_put_resv_regions()
Implement a generic function for removing reserved regions. This can be used by drivers that don't do anything fancy with these regions other than allocating memory for them. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -2229,6 +2229,25 @@ void iommu_put_resv_regions(struct device *dev, struct list_head *list)
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ops->put_resv_regions(dev, list);
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}
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/**
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* generic_iommu_put_resv_regions - Reserved region driver helper
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* @dev: device for which to free reserved regions
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* @list: reserved region list for device
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*
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* IOMMU drivers can use this to implement their .put_resv_regions() callback
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* for simple reservations. Memory allocated for each reserved region will be
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* freed. If an IOMMU driver allocates additional resources per region, it is
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* going to have to implement a custom callback.
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*/
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void generic_iommu_put_resv_regions(struct device *dev, struct list_head *list)
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{
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struct iommu_resv_region *entry, *next;
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list_for_each_entry_safe(entry, next, list, list)
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kfree(entry);
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}
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EXPORT_SYMBOL(generic_iommu_put_resv_regions);
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struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start,
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size_t length, int prot,
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enum iommu_resv_type type)
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@ -456,6 +456,8 @@ extern void iommu_set_fault_handler(struct iommu_domain *domain,
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extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
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extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
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extern void generic_iommu_put_resv_regions(struct device *dev,
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struct list_head *list);
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extern int iommu_request_dm_for_dev(struct device *dev);
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extern int iommu_request_dma_domain_for_dev(struct device *dev);
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extern void iommu_set_default_passthrough(bool cmd_line);
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