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iommu: Introduce iommu_iotlb_gather_add_page() 

Introduce a helper function for drivers to use when updating an
iommu_iotlb_gather structure in response to an ->unmap() call, rather
than having to open-code the logic in every page-table implementation.

Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Will Deacon 2019-07-02 16:43:57 +01:00
parent a7d20dc19d
commit 4fcf8544fc
1 changed files with 31 additions and 0 deletions
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31
include/linux/iommu.h
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@ -507,6 +507,31 @@ static inline void iommu_tlb_sync(struct iommu_domain *domain,
iommu_iotlb_gather_init(iotlb_gather);
}
static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
struct iommu_iotlb_gather *gather,
unsigned long iova, size_t size)
{
unsigned long start = iova, end = start + size;
/*
* If the new page is disjoint from the current range or is mapped at
* a different granularity, then sync the TLB so that the gather
* structure can be rewritten.
*/
if (gather->pgsize != size ||
end < gather->start || start > gather->end) {
if (gather->pgsize)
iommu_tlb_sync(domain, gather);
gather->pgsize = size;
}
if (gather->end < end)
gather->end = end;
if (gather->start > start)
gather->start = start;
}
/* PCI device grouping function */
extern struct iommu_group *pci_device_group(struct device *dev);
/* Generic device grouping function */
@ -847,6 +872,12 @@ static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
{
}
static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
struct iommu_iotlb_gather *gather,
unsigned long iova, size_t size)
{
}
static inline void iommu_device_unregister(struct iommu_device *iommu)
{
}