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Commit 2c1296d9 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu: Add iommu_get_domain_for_dev function 



This function can be used to request the current domain a
device is attached to.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent e39cb8a3

drivers/iommu/iommu.c

+18 −0
Original line number Diff line number Diff line
@@ -1076,6 +1076,24 @@ out_unlock: 
}

EXPORT_SYMBOL_GPL(iommu_detach_device);



struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)

{

	struct iommu_domain *domain;

	struct iommu_group *group;



	group = iommu_group_get(dev);

	/* FIXME: Remove this when groups a mandatory for iommu drivers */

	if (group == NULL)

		return NULL;



	domain = group->domain;



	iommu_group_put(group);



	return domain;

}

EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev);



/*

 * IOMMU groups are really the natrual working unit of the IOMMU, but

 * the IOMMU API works on domains and devices.  Bridge that gap by

include/linux/iommu.h

+6 −0
Original line number Diff line number Diff line
@@ -193,6 +193,7 @@ extern int iommu_attach_device(struct iommu_domain *domain, 
			       struct device *dev);

extern void iommu_detach_device(struct iommu_domain *domain,

				struct device *dev);

extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);

extern int iommu_map(struct iommu_domain *domain, unsigned long iova,

		     phys_addr_t paddr, size_t size, int prot);

extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
@@ -332,6 +333,11 @@ static inline void iommu_detach_device(struct iommu_domain *domain, 
{

}



static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)

{

	return NULL;

}



static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,

			    phys_addr_t paddr, int gfp_order, int prot)

{