Revert "scatterlist: use sg_phys()"

commit db0fa0cb "scatterlist: use sg_phys()" did replacements of
the form:

    phys_addr_t phys = page_to_phys(sg_page(s));
    phys_addr_t phys = sg_phys(s) & PAGE_MASK;

However, this breaks platforms where sizeof(phys_addr_t) >
sizeof(unsigned long).  Revert for 4.3 and 4.4 to make room for a
combined helper in 4.5.

Cc: <stable@vger.kernel.org>
Cc: Jens Axboe <axboe@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Fixes: db0fa0cb ("scatterlist: use sg_phys()")
Suggested-by: Joerg Roedel <joro@8bytes.org>
Reported-by: Vitaly Lavrov <vel21ripn@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

arch/arm/mm/dma-mapping.c

@@ -1521,7 +1521,7 @@ 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 = sg_phys(s) & PAGE_MASK;
+		phys_addr_t phys = page_to_phys(sg_page(s));
 		unsigned int len = PAGE_ALIGN(s->offset + s->length);
 
 		if (!is_coherent &&

arch/microblaze/kernel/dma.c

@@ -61,7 +61,8 @@ 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(sg_phys(sg), sg->length, direction);
+		__dma_sync(page_to_phys(sg_page(sg)) + sg->offset,
+							sg->length, direction);
 	}
 
 	return nents;

drivers/iommu/intel-iommu.c

@@ -2159,7 +2159,7 @@ 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 = (sg_phys(sg) & PAGE_MASK) | prot;
+			pteval = page_to_phys(sg_page(sg)) | prot;
 			phys_pfn = pteval >> VTD_PAGE_SHIFT;
 		}
 
@@ -3704,7 +3704,7 @@ static int intel_nontranslate_map_sg(struct device *hddev,
 
 	for_each_sg(sglist, sg, nelems, i) {
 		BUG_ON(!sg_page(sg));
-		sg->dma_address = sg_phys(sg);
+		sg->dma_address = page_to_phys(sg_page(sg)) + sg->offset;
 		sg->dma_length = sg->length;
 	}
 	return nelems;

drivers/iommu/iommu.c

@@ -1430,7 +1430,7 @@ 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 = sg_phys(s);
+		phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset;
 
 		/*
 		 * We are mapping on IOMMU page boundaries, so offset within

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, sg_phys(sg) & PAGE_MASK,
+		gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
 			      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, sg_phys(sg) & PAGE_MASK,
+		gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
 			      sg->length);
 	}
 	chunk_heap->allocated -= allocated_size;