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iommu-api: Add iommu_map and iommu_unmap functions

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These two functions provide support for mapping and
unmapping physical addresses to io virtual addresses. The
difference to the iommu_(un)map_range() is that the new
functions take a gfp_order parameter instead of a size. This
allows the IOMMU backend implementations to detect easier if
a given range can be mapped by larger page sizes.
These new functions should replace the old ones in the long
term.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel
2010-01-08 13:35:09 +01:00
parent 4abc14a733
commit cefc53c7f4
2 changed files with 47 additions and 0 deletions
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31
drivers/base/iommu.c
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@@ -107,3 +107,34 @@ int iommu_domain_has_cap(struct iommu_domain *domain,
return iommu_ops->domain_has_cap(domain, cap); return iommu_ops->domain_has_cap(domain, cap);
} }
EXPORT_SYMBOL_GPL(iommu_domain_has_cap); EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
int iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, int gfp_order, int prot)
{
unsigned long invalid_mask;
size_t size;
size = 0x1000UL << gfp_order;
invalid_mask = size - 1;
BUG_ON((iova | paddr) & invalid_mask);
return iommu_ops->map_range(domain, iova, paddr, size, prot);
}
EXPORT_SYMBOL_GPL(iommu_map);
int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order)
{
unsigned long invalid_mask;
size_t size;
size = 0x1000UL << gfp_order;
invalid_mask = size - 1;
BUG_ON(iova & invalid_mask);
iommu_ops->unmap_range(domain, iova, size);
return gfp_order;
}
EXPORT_SYMBOL_GPL(iommu_unmap);

16
include/linux/iommu.h
View File

@@ -60,6 +60,10 @@ extern int iommu_map_range(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t size, int prot); phys_addr_t paddr, size_t size, int prot);
extern void iommu_unmap_range(struct iommu_domain *domain, unsigned long iova, extern void iommu_unmap_range(struct iommu_domain *domain, unsigned long iova,
size_t size); size_t size);
extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, int gfp_order, int prot);
extern int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
int gfp_order);
extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
unsigned long iova); unsigned long iova);
extern int iommu_domain_has_cap(struct iommu_domain *domain, extern int iommu_domain_has_cap(struct iommu_domain *domain,
@@ -108,6 +112,18 @@ static inline void iommu_unmap_range(struct iommu_domain *domain,
{ {
} }
static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, int gfp_order, int prot)
{
return -ENODEV;
}
static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
int gfp_order)
{
return -ENODEV;
}
static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
unsigned long iova) unsigned long iova)
{ {