diff options
Diffstat (limited to 'include/linux/iommu.h')
-rw-r--r-- | include/linux/iommu.h | 38 |
1 files changed, 33 insertions, 5 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 32d448050bf7..e554871db46f 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -497,6 +497,38 @@ static inline void iommu_iotlb_sync(struct iommu_domain *domain, iommu_iotlb_gather_init(iotlb_gather); } +/** + * iommu_iotlb_gather_add_range - Gather for address-based TLB invalidation + * @gather: TLB gather data + * @iova: start of page to invalidate + * @size: size of page to invalidate + * + * Helper for IOMMU drivers to build arbitrarily-sized invalidation commands + * where only the address range matters, and simply minimising intermediate + * syncs is preferred. + */ +static inline void iommu_iotlb_gather_add_range(struct iommu_iotlb_gather *gather, + unsigned long iova, size_t size) +{ + unsigned long end = iova + size - 1; + + if (gather->start > iova) + gather->start = iova; + if (gather->end < end) + gather->end = end; +} + +/** + * iommu_iotlb_gather_add_page - Gather for page-based TLB invalidation + * @domain: IOMMU domain to be invalidated + * @gather: TLB gather data + * @iova: start of page to invalidate + * @size: size of page to invalidate + * + * Helper for IOMMU drivers to build invalidation commands based on individual + * pages, or with page size/table level hints which cannot be gathered if they + * differ. + */ static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain, struct iommu_iotlb_gather *gather, unsigned long iova, size_t size) @@ -515,11 +547,7 @@ static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain, gather->pgsize = size; } - if (gather->end < end) - gather->end = end; - - if (gather->start > start) - gather->start = start; + iommu_iotlb_gather_add_range(gather, iova, size); } /* PCI device grouping function */ |