x86, calgary: add map_page and unmap_page

This is a preparation of struct dma_mapping_ops unification. We use
map_page and unmap_page instead of map_single and unmap_single.

We will remove map_single and unmap_single hooks in the last patch in
this patchset.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 27 insertions, 8 deletions

diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index d28bbdc35e4e..e33cfcf1af5b 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -445,10 +445,12 @@ error:
         return 0;
 }
 
-static dma_addr_t calgary_map_single(struct device *dev, phys_addr_t paddr,
-        size_t size, int direction)
+static dma_addr_t calgary_map_page(struct device *dev, struct page *page,
+                                   unsigned long offset, size_t size,
+                                   enum dma_data_direction dir,
+                                   struct dma_attrs *attrs)
 {
-        void *vaddr = phys_to_virt(paddr);
+        void *vaddr = page_address(page) + offset;
         unsigned long uaddr;
         unsigned int npages;
         struct iommu_table *tbl = find_iommu_table(dev);
@@ -456,17 +458,32 @@ static dma_addr_t calgary_map_single(struct device *dev, phys_addr_t paddr,
         uaddr = (unsigned long)vaddr;
         npages = iommu_num_pages(uaddr, size, PAGE_SIZE);
 
-        return iommu_alloc(dev, tbl, vaddr, npages, direction);
+        return iommu_alloc(dev, tbl, vaddr, npages, dir);
 }
 
-static void calgary_unmap_single(struct device *dev, dma_addr_t dma_handle,
-        size_t size, int direction)
+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)
 {
         struct iommu_table *tbl = find_iommu_table(dev);
         unsigned int npages;
 
-        npages = iommu_num_pages(dma_handle, size, PAGE_SIZE);
-        iommu_free(tbl, dma_handle, npages);
+        npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
+        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,
@@ -522,6 +539,8 @@ static struct dma_mapping_ops calgary_dma_ops = {
         .unmap_single = calgary_unmap_single,
         .map_sg = calgary_map_sg,
         .unmap_sg = calgary_unmap_sg,
+        .map_page = calgary_map_page,
+        .unmap_page = calgary_unmap_page,
 };
 
 static inline void __iomem * busno_to_bbar(unsigned char num)