x86: remove map_single and unmap_single in struct dma_mapping_ops

This patch converts dma_map_single and dma_unmap_single to use
map_page and unmap_page respectively and removes unnecessary
map_single and unmap_single in struct dma_mapping_ops.

This leaves intel-iommu's dma_map_single and dma_unmap_single since
IA64 uses them. They will be removed after the unification.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/include/asm/dma-mapping.h

@@ -24,10 +24,6 @@ struct dma_mapping_ops {
 				dma_addr_t *dma_handle, gfp_t gfp);
 	void            (*free_coherent)(struct device *dev, size_t size,
 				void *vaddr, dma_addr_t dma_handle);
-	dma_addr_t      (*map_single)(struct device *hwdev, phys_addr_t ptr,
-				size_t size, int direction);
-	void            (*unmap_single)(struct device *dev, dma_addr_t addr,
-				size_t size, int direction);
 	void            (*sync_single_for_cpu)(struct device *hwdev,
 				dma_addr_t dma_handle, size_t size,
 				int direction);
@@ -103,7 +99,9 @@ dma_map_single(struct device *hwdev, void *ptr, size_t size,
 	struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 
 	BUG_ON(!valid_dma_direction(direction));
-	return ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
+	return ops->map_page(hwdev, virt_to_page(ptr),
+			     (unsigned long)ptr & ~PAGE_MASK, size,
+			     direction, NULL);
 }
 
 static inline void
@@ -113,8 +111,8 @@ dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
 	struct dma_mapping_ops *ops = get_dma_ops(dev);
 
 	BUG_ON(!valid_dma_direction(direction));
-	if (ops->unmap_single)
-		ops->unmap_single(dev, addr, size, direction);
+	if (ops->unmap_page)
+		ops->unmap_page(dev, addr, size, direction, NULL);
 }
 
 static inline int
@@ -221,8 +219,7 @@ static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 	struct dma_mapping_ops *ops = get_dma_ops(dev);
 
 	BUG_ON(!valid_dma_direction(direction));
-	return ops->map_single(dev, page_to_phys(page) + offset,
-			       size, direction);
+	return ops->map_page(dev, page, offset, size, direction, NULL);
 }
 
 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,

arch/x86/kernel/amd_iommu.c

@@ -1341,13 +1341,6 @@ out:
 	return addr;
 }
 
-static dma_addr_t map_single(struct device *dev, phys_addr_t paddr,
-			     size_t size, int dir)
-{
-	return map_page(dev, pfn_to_page(paddr >> PAGE_SHIFT),
-			paddr & ~PAGE_MASK, size, dir, NULL);
-}
-
 /*
  * The exported unmap_single function for dma_ops.
  */
@@ -1378,12 +1371,6 @@ static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
 	spin_unlock_irqrestore(&domain->lock, flags);
 }
 
-static void unmap_single(struct device *dev, dma_addr_t dma_addr,
-			 size_t size, int dir)
-{
-	return unmap_page(dev, dma_addr, size, dir, NULL);
-}
-
 /*
  * This is a special map_sg function which is used if we should map a
  * device which is not handled by an AMD IOMMU in the system.
@@ -1664,8 +1651,6 @@ static void prealloc_protection_domains(void)
 static struct dma_mapping_ops amd_iommu_dma_ops = {
 	.alloc_coherent = alloc_coherent,
 	.free_coherent = free_coherent,
-	.map_single = map_single,
-	.unmap_single = unmap_single,
 	.map_page = map_page,
 	.unmap_page = unmap_page,
 	.map_sg = map_sg,

arch/x86/kernel/pci-calgary_64.c

@@ -461,14 +461,6 @@ static dma_addr_t calgary_map_page(struct device *dev, struct page *page,
 	return iommu_alloc(dev, tbl, vaddr, npages, dir);
 }
 
-static dma_addr_t calgary_map_single(struct device *dev, phys_addr_t paddr,
-				     size_t size, int direction)
-{
-	return calgary_map_page(dev, pfn_to_page(paddr >> PAGE_SHIFT),
-				paddr & ~PAGE_MASK, size,
-				direction, NULL);
-}
-
 static void calgary_unmap_page(struct device *dev, dma_addr_t dma_addr,
 			       size_t size, enum dma_data_direction dir,
 			       struct dma_attrs *attrs)
@@ -480,12 +472,6 @@ static void calgary_unmap_page(struct device *dev, dma_addr_t dma_addr,
 	iommu_free(tbl, dma_addr, npages);
 }
 
-static void calgary_unmap_single(struct device *dev, dma_addr_t dma_handle,
-				 size_t size, int direction)
-{
-	calgary_unmap_page(dev, dma_handle, size, direction, NULL);
-}
-
 static void* calgary_alloc_coherent(struct device *dev, size_t size,
 	dma_addr_t *dma_handle, gfp_t flag)
 {
@@ -535,8 +521,6 @@ static void calgary_free_coherent(struct device *dev, size_t size,
 static struct dma_mapping_ops calgary_dma_ops = {
 	.alloc_coherent = calgary_alloc_coherent,
 	.free_coherent = calgary_free_coherent,
-	.map_single = calgary_map_single,
-	.unmap_single = calgary_unmap_single,
 	.map_sg = calgary_map_sg,
 	.unmap_sg = calgary_unmap_sg,
 	.map_page = calgary_map_page,

arch/x86/kernel/pci-gart_64.c

@@ -275,13 +275,6 @@ static dma_addr_t gart_map_page(struct device *dev, struct page *page,
 	return bus;
 }
 
-static dma_addr_t gart_map_single(struct device *dev, phys_addr_t paddr,
-				  size_t size, int dir)
-{
-	return gart_map_page(dev, pfn_to_page(paddr >> PAGE_SHIFT),
-			     paddr & ~PAGE_MASK, size, dir, NULL);
-}
-
 /*
  * Free a DMA mapping.
  */
@@ -306,12 +299,6 @@ static void gart_unmap_page(struct device *dev, dma_addr_t dma_addr,
 	free_iommu(iommu_page, npages);
 }
 
-static void gart_unmap_single(struct device *dev, dma_addr_t dma_addr,
-			      size_t size, int direction)
-{
-	gart_unmap_page(dev, dma_addr, size, direction, NULL);
-}
-
 /*
  * Wrapper for pci_unmap_single working with scatterlists.
  */
@@ -324,7 +311,7 @@ gart_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
 	for_each_sg(sg, s, nents, i) {
 		if (!s->dma_length || !s->length)
 			break;
-		gart_unmap_single(dev, s->dma_address, s->dma_length, dir);
+		gart_unmap_page(dev, s->dma_address, s->dma_length, dir, NULL);
 	}
 }
 
@@ -538,7 +525,7 @@ static void
 gart_free_coherent(struct device *dev, size_t size, void *vaddr,
 		   dma_addr_t dma_addr)
 {
-	gart_unmap_single(dev, dma_addr, size, DMA_BIDIRECTIONAL);
+	gart_unmap_page(dev, dma_addr, size, DMA_BIDIRECTIONAL, NULL);
 	free_pages((unsigned long)vaddr, get_order(size));
 }
 
@@ -725,8 +712,6 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
 }
 
 static struct dma_mapping_ops gart_dma_ops = {
-	.map_single			= gart_map_single,
-	.unmap_single			= gart_unmap_single,
 	.map_sg				= gart_map_sg,
 	.unmap_sg			= gart_unmap_sg,
 	.map_page			= gart_map_page,

arch/x86/kernel/pci-nommu.c

@@ -38,13 +38,6 @@ static dma_addr_t nommu_map_page(struct device *dev, struct page *page,
 	return bus;
 }
 
-static dma_addr_t nommu_map_single(struct device *hwdev, phys_addr_t paddr,
-				   size_t size, int direction)
-{
-	return nommu_map_page(hwdev, pfn_to_page(paddr >> PAGE_SHIFT),
-			      paddr & ~PAGE_MASK, size, direction, NULL);
-}
-
 /* Map a set of buffers described by scatterlist in streaming
  * mode for DMA.  This is the scatter-gather version of the
  * above pci_map_single interface.  Here the scatter gather list
@@ -88,7 +81,6 @@ static void nommu_free_coherent(struct device *dev, size_t size, void *vaddr,
 struct dma_mapping_ops nommu_dma_ops = {
 	.alloc_coherent = dma_generic_alloc_coherent,
 	.free_coherent = nommu_free_coherent,
-	.map_single = nommu_map_single,
 	.map_sg = nommu_map_sg,
 	.map_page = nommu_map_page,
 	.is_phys = 1,

arch/x86/kernel/pci-swiotlb_64.c

@@ -38,13 +38,6 @@ int __weak swiotlb_arch_range_needs_mapping(void *ptr, size_t size)
 	return 0;
 }
 
-static dma_addr_t
-swiotlb_map_single_phys(struct device *hwdev, phys_addr_t paddr, size_t size,
-			int direction)
-{
-	return swiotlb_map_single(hwdev, phys_to_virt(paddr), size, direction);
-}
-
 /* these will be moved to lib/swiotlb.c later on */
 
 static dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
@@ -78,8 +71,6 @@ struct dma_mapping_ops swiotlb_dma_ops = {
 	.mapping_error = swiotlb_dma_mapping_error,
 	.alloc_coherent = x86_swiotlb_alloc_coherent,
 	.free_coherent = swiotlb_free_coherent,
-	.map_single = swiotlb_map_single_phys,
-	.unmap_single = swiotlb_unmap_single,
 	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
 	.sync_single_for_device = swiotlb_sync_single_for_device,
 	.sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,

drivers/pci/intel-iommu.c

@@ -2582,8 +2582,6 @@ int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int nelems,
 static struct dma_mapping_ops intel_dma_ops = {
 	.alloc_coherent = intel_alloc_coherent,
 	.free_coherent = intel_free_coherent,
-	.map_single = intel_map_single,
-	.unmap_single = intel_unmap_single,
 	.map_sg = intel_map_sg,
 	.unmap_sg = intel_unmap_sg,
 #ifdef CONFIG_X86_64