Use the common helper for accounting the size of the IOVA range for a
scatterlist so that iommu and dma apis agree on the size of a
scatterlist. This is in support for using iommu_unmap() in advance of
dma_unmap_sg() to invalidate an io-mapping in advance of the IOVA range
being deallocated. MAP_DIRECT needs this functionality for force
revoking RDMA access to a DAX mapping when userspace fails to respond to
within a lease break timeout period.
Cc: Ashok Raj <ashok....@intel.com>
Cc: David Woodhouse <dw...@infradead.org>
Cc: Joerg Roedel <j...@8bytes.org>
Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
---
drivers/iommu/intel-iommu.c | 19 +++++--------------
1 file changed, 5 insertions(+), 14 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index f3f4939cebad..94a5fbe62fb8 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3785,14 +3785,9 @@ static void intel_unmap_sg(struct device *dev, struct
scatterlist *sglist,
unsigned long attrs)
{
dma_addr_t startaddr = sg_dma_address(sglist) & PAGE_MASK;
- unsigned long nrpages = 0;
- struct scatterlist *sg;
- int i;
-
- for_each_sg(sglist, sg, nelems, i) {
- nrpages += aligned_nrpages(sg_dma_address(sg), sg_dma_len(sg));
- }
+ unsigned long nrpages;
+ nrpages = iommu_sg_num_pages(dev, sglist, nelems);
intel_unmap(dev, startaddr, nrpages << VTD_PAGE_SHIFT);
}
@@ -3813,14 +3808,12 @@ static int intel_nontranslate_map_sg(struct device
*hddev,
static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int
nelems,
enum dma_data_direction dir, unsigned long attrs)
{
- int i;
struct dmar_domain *domain;
size_t size = 0;
int prot = 0;
unsigned long iova_pfn;
int ret;
- struct scatterlist *sg;
- unsigned long start_vpfn;
+ unsigned long start_vpfn, npages;
struct intel_iommu *iommu;
BUG_ON(dir == DMA_NONE);
@@ -3833,11 +3826,9 @@ static int intel_map_sg(struct device *dev, struct
scatterlist *sglist, int nele
iommu = domain_get_iommu(domain);
- for_each_sg(sglist, sg, nelems, i)
- size += aligned_nrpages(sg->offset, sg->length);
+ npages = iommu_sg_num_pages(dev, sglist, nelems);
- iova_pfn = intel_alloc_iova(dev, domain, dma_to_mm_pfn(size),
- *dev->dma_mask);
+ iova_pfn = intel_alloc_iova(dev, domain, npages, *dev->dma_mask);
if (!iova_pfn) {
sglist->dma_length = 0;
return 0;
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