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iommu: Add iommu_get_domain_for_dev function

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

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-05-28 18:41:32 +02:00
parent e39cb8a3aa
commit 2c1296d92a
2 changed files with 24 additions and 0 deletions
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18
drivers/iommu/iommu.c
View File

@ -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

6
include/linux/iommu.h
View File

@ -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)
{