scatterlist: use sg_phys()

Coccinelle cleanup to replace open coded sg to physical address
translations.  This is in preparation for introducing scatterlists that
reference __pfn_t.

// sg_phys.cocci: convert usage page_to_phys(sg_page(sg)) to sg_phys(sg)
// usage: make coccicheck COCCI=sg_phys.cocci MODE=patch

virtual patch

@@
struct scatterlist *sg;
@@

- page_to_phys(sg_page(sg)) + sg->offset
+ sg_phys(sg)

@@
struct scatterlist *sg;
@@

- page_to_phys(sg_page(sg))
+ sg_phys(sg) & PAGE_MASK

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index a98a7b27aca1..b261850a7694 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2094,7 +2094,7 @@ static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
                         sg_res = aligned_nrpages(sg->offset, sg->length);
                         sg->dma_address = ((dma_addr_t)iov_pfn << VTD_PAGE_SHIFT) + sg->offset;
                         sg->dma_length = sg->length;
-                        pteval = page_to_phys(sg_page(sg)) | prot;
+                        pteval = (sg_phys(sg) & PAGE_MASK) | prot;
                         phys_pfn = pteval >> VTD_PAGE_SHIFT;
                 }
 
@@ -3620,7 +3620,7 @@ static int intel_nontranslate_map_sg(struct device *hddev,
 
         for_each_sg(sglist, sg, nelems, i) {
                 BUG_ON(!sg_page(sg));
-                sg->dma_address = page_to_phys(sg_page(sg)) + sg->offset;
+                sg->dma_address = sg_phys(sg);
                 sg->dma_length = sg->length;
         }
         return nelems;