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>

5 files changed, 7 insertions, 8 deletions

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 1ced8a0f7a52..4efaefd61c1c 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1520,7 +1520,7 @@ static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
                 return -ENOMEM;
 
         for (count = 0, s = sg; count < (size >> PAGE_SHIFT); s = sg_next(s)) {
-                phys_addr_t phys = page_to_phys(sg_page(s));
+                phys_addr_t phys = sg_phys(s) & PAGE_MASK;
                 unsigned int len = PAGE_ALIGN(s->offset + s->length);
 
                 if (!is_coherent &&
diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
index bf4dec229437..c89da6312954 100644
--- a/arch/microblaze/kernel/dma.c
+++ b/arch/microblaze/kernel/dma.c
@@ -61,8 +61,7 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
         /* FIXME this part of code is untested */
         for_each_sg(sgl, sg, nents, i) {
                 sg->dma_address = sg_phys(sg);
-                __dma_sync(page_to_phys(sg_page(sg)) + sg->offset,
-                                                        sg->length, direction);
+                __dma_sync(sg_phys(sg), sg->length, direction);
         }
 
         return nents;
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;
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index f286090931cc..049df495c274 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1408,7 +1408,7 @@ size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
         min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
 
         for_each_sg(sg, s, nents, i) {
-                phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset;
+                phys_addr_t phys = sg_phys(s);
 
                 /*
                  * We are mapping on IOMMU page boundaries, so offset within
diff --git a/drivers/staging/android/ion/ion_chunk_heap.c b/drivers/staging/android/ion/ion_chunk_heap.c
index 54746157d799..f7b6ef991cd0 100644
--- a/drivers/staging/android/ion/ion_chunk_heap.c
+++ b/drivers/staging/android/ion/ion_chunk_heap.c
@@ -81,7 +81,7 @@ static int ion_chunk_heap_allocate(struct ion_heap *heap,
 err:
         sg = table->sgl;
         for (i -= 1; i >= 0; i--) {
-                gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
+                gen_pool_free(chunk_heap->pool, sg_phys(sg) & PAGE_MASK,
                               sg->length);
                 sg = sg_next(sg);
         }
@@ -109,7 +109,7 @@ static void ion_chunk_heap_free(struct ion_buffer *buffer)
                                                         DMA_BIDIRECTIONAL);
 
         for_each_sg(table->sgl, sg, table->nents, i) {
-                gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
+                gen_pool_free(chunk_heap->pool, sg_phys(sg) & PAGE_MASK,
                               sg->length);
         }
         chunk_heap->allocated -= allocated_size;